merge nfs bugfixes into nfsd for-3.19 branch

In addition to nfsd bugfixes, there are some fixes in -rc5 for client
bugs that can interfere with my testing.

100 files changed, 5291 insertions, 2392 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index db5dc1598716..664991afe0c0 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -67,6 +67,7 @@ source "fs/quota/Kconfig"
 
 source "fs/autofs4/Kconfig"
 source "fs/fuse/Kconfig"
+source "fs/overlayfs/Kconfig"
 
 menu "Caches"
 
diff --git a/fs/Makefile b/fs/Makefile
index 90c88529892b..34a1b9dea6dd 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_QNX6FS_FS)		+= qnx6/
 obj-$(CONFIG_AUTOFS4_FS)	+= autofs4/
 obj-$(CONFIG_ADFS_FS)		+= adfs/
 obj-$(CONFIG_FUSE_FS)		+= fuse/
+obj-$(CONFIG_OVERLAYFS_FS)	+= overlayfs/
 obj-$(CONFIG_UDF_FS)		+= udf/
 obj-$(CONFIG_SUN_OPENPROMFS)	+= openpromfs/
 obj-$(CONFIG_OMFS_FS)		+= omfs/
diff --git a/fs/block_dev.c b/fs/block_dev.c
index cc9d4114cda0..1d9c9f3754f8 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1585,7 +1585,7 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
 }
 EXPORT_SYMBOL_GPL(blkdev_write_iter);
 
-static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
+ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
 	struct file *file = iocb->ki_filp;
 	struct inode *bd_inode = file->f_mapping->host;
@@ -1599,6 +1599,7 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
 	iov_iter_truncate(to, size);
 	return generic_file_read_iter(iocb, to);
 }
+EXPORT_SYMBOL_GPL(blkdev_read_iter);
 
 /*
  * Try to release a page associated with block device when the system
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index d557264ee974..fe69edda11fb 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3276,7 +3276,7 @@ int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
 			   struct btrfs_root *root, unsigned long count);
 int btrfs_async_run_delayed_refs(struct btrfs_root *root,
 				 unsigned long count, int wait);
-int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
+int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len);
 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *root, u64 bytenr,
 			     u64 offset, int metadata, u64 *refs, u64 *flags);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 1ad0f47ac850..1bf9f897065d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3817,19 +3817,19 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
 	struct btrfs_super_block *sb = fs_info->super_copy;
 	int ret = 0;
 
-	if (sb->root_level > BTRFS_MAX_LEVEL) {
-		printk(KERN_ERR "BTRFS: tree_root level too big: %d > %d\n",
-				sb->root_level, BTRFS_MAX_LEVEL);
+	if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
+		printk(KERN_ERR "BTRFS: tree_root level too big: %d >= %d\n",
+				btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
 		ret = -EINVAL;
 	}
-	if (sb->chunk_root_level > BTRFS_MAX_LEVEL) {
-		printk(KERN_ERR "BTRFS: chunk_root level too big: %d > %d\n",
-				sb->chunk_root_level, BTRFS_MAX_LEVEL);
+	if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
+		printk(KERN_ERR "BTRFS: chunk_root level too big: %d >= %d\n",
+				btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
 		ret = -EINVAL;
 	}
-	if (sb->log_root_level > BTRFS_MAX_LEVEL) {
-		printk(KERN_ERR "BTRFS: log_root level too big: %d > %d\n",
-				sb->log_root_level, BTRFS_MAX_LEVEL);
+	if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
+		printk(KERN_ERR "BTRFS: log_root level too big: %d >= %d\n",
+				btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
 		ret = -EINVAL;
 	}
 
@@ -3837,15 +3837,15 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
 	 * The common minimum, we don't know if we can trust the nodesize/sectorsize
 	 * items yet, they'll be verified later. Issue just a warning.
 	 */
-	if (!IS_ALIGNED(sb->root, 4096))
+	if (!IS_ALIGNED(btrfs_super_root(sb), 4096))
 		printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n",
 				sb->root);
-	if (!IS_ALIGNED(sb->chunk_root, 4096))
+	if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096))
 		printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n",
 				sb->chunk_root);
-	if (!IS_ALIGNED(sb->log_root, 4096))
+	if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096))
 		printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n",
-				sb->log_root);
+				btrfs_super_log_root(sb));
 
 	if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
 		printk(KERN_ERR "BTRFS: dev_item UUID does not match fsid: %pU != %pU\n",
@@ -3857,13 +3857,13 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
 	 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
 	 * done later
 	 */
-	if (sb->num_devices > (1UL << 31))
+	if (btrfs_super_num_devices(sb) > (1UL << 31))
 		printk(KERN_WARNING "BTRFS: suspicious number of devices: %llu\n",
-				sb->num_devices);
+				btrfs_super_num_devices(sb));
 
-	if (sb->bytenr != BTRFS_SUPER_INFO_OFFSET) {
+	if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) {
 		printk(KERN_ERR "BTRFS: super offset mismatch %llu != %u\n",
-				sb->bytenr, BTRFS_SUPER_INFO_OFFSET);
+				btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
 		ret = -EINVAL;
 	}
 
@@ -3871,14 +3871,15 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
 	 * The generation is a global counter, we'll trust it more than the others
 	 * but it's still possible that it's the one that's wrong.
 	 */
-	if (sb->generation < sb->chunk_root_generation)
+	if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
 		printk(KERN_WARNING
 			"BTRFS: suspicious: generation < chunk_root_generation: %llu < %llu\n",
-			sb->generation, sb->chunk_root_generation);
-	if (sb->generation < sb->cache_generation && sb->cache_generation != (u64)-1)
+			btrfs_super_generation(sb), btrfs_super_chunk_root_generation(sb));
+	if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
+	    && btrfs_super_cache_generation(sb) != (u64)-1)
 		printk(KERN_WARNING
 			"BTRFS: suspicious: generation < cache_generation: %llu < %llu\n",
-			sb->generation, sb->cache_generation);
+			btrfs_super_generation(sb), btrfs_super_cache_generation(sb));
 
 	return ret;
 }
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d56589571012..47c1ba141082 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -710,8 +710,8 @@ void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
 	rcu_read_unlock();
 }
 
-/* simple helper to search for an existing extent at a given offset */
-int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len)
+/* simple helper to search for an existing data extent at a given offset */
+int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len)
 {
 	int ret;
 	struct btrfs_key key;
@@ -726,12 +726,6 @@ int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len)
 	key.type = BTRFS_EXTENT_ITEM_KEY;
 	ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path,
 				0, 0);
-	if (ret > 0) {
-		btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
-		if (key.objectid == start &&
-		    key.type == BTRFS_METADATA_ITEM_KEY)
-			ret = 0;
-	}
 	btrfs_free_path(path);
 	return ret;
 }
@@ -786,7 +780,6 @@ search_again:
 	else
 		key.type = BTRFS_EXTENT_ITEM_KEY;
 
-again:
 	ret = btrfs_search_slot(trans, root->fs_info->extent_root,
 				&key, path, 0, 0);
 	if (ret < 0)
@@ -802,13 +795,6 @@ again:
 			    key.offset == root->nodesize)
 				ret = 0;
 		}
-		if (ret) {
-			key.objectid = bytenr;
-			key.type = BTRFS_EXTENT_ITEM_KEY;
-			key.offset = root->nodesize;
-			btrfs_release_path(path);
-			goto again;
-		}
 	}
 
 	if (ret == 0) {
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 783a94355efd..84a2d1868271 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -413,7 +413,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
 	ret = 0;
 fail:
 	while (ret < 0 && !list_empty(&tmplist)) {
-		sums = list_entry(&tmplist, struct btrfs_ordered_sum, list);
+		sums = list_entry(tmplist.next, struct btrfs_ordered_sum, list);
 		list_del(&sums->list);
 		kfree(sums);
 	}
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8d2b76e29d3b..4399f0c3a4ce 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -765,23 +765,6 @@ out:
 	return ret;
 }
 
-/*  copy of check_sticky in fs/namei.c()
-* It's inline, so penalty for filesystems that don't use sticky bit is
-* minimal.
-*/
-static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
-{
-	kuid_t fsuid = current_fsuid();
-
-	if (!(dir->i_mode & S_ISVTX))
-		return 0;
-	if (uid_eq(inode->i_uid, fsuid))
-		return 0;
-	if (uid_eq(dir->i_uid, fsuid))
-		return 0;
-	return !capable(CAP_FOWNER);
-}
-
 /*  copy of may_delete in fs/namei.c()
  *	Check whether we can remove a link victim from directory dir, check
  *  whether the type of victim is right.
@@ -817,8 +800,7 @@ static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
 		return error;
 	if (IS_APPEND(dir))
 		return -EPERM;
-	if (btrfs_check_sticky(dir, victim->d_inode)||
-		IS_APPEND(victim->d_inode)||
+	if (check_sticky(dir, victim->d_inode) || IS_APPEND(victim->d_inode) ||
 	    IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
 		return -EPERM;
 	if (isdir) {
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index a2b97ef10317..54bd91ece35b 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2151,6 +2151,7 @@ static void __exit exit_btrfs_fs(void)
 	extent_map_exit();
 	extent_io_exit();
 	btrfs_interface_exit();
+	btrfs_end_io_wq_exit();
 	unregister_filesystem(&btrfs_fs_type);
 	btrfs_exit_sysfs();
 	btrfs_cleanup_fs_uuids();
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 1475979e5718..286213cec861 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -672,7 +672,7 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
 			 * is this extent already allocated in the extent
 			 * allocation tree?  If so, just add a reference
 			 */
-			ret = btrfs_lookup_extent(root, ins.objectid,
+			ret = btrfs_lookup_data_extent(root, ins.objectid,
 						ins.offset);
 			if (ret == 0) {
 				ret = btrfs_inc_extent_ref(trans, root,
diff --git a/fs/buffer.c b/fs/buffer.c
index 9614adc7e754..20805db2c987 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -128,21 +128,15 @@ __clear_page_buffers(struct page *page)
 	page_cache_release(page);
 }
 
-
-static int quiet_error(struct buffer_head *bh)
-{
-	if (!test_bit(BH_Quiet, &bh->b_state) && printk_ratelimit())
-		return 0;
-	return 1;
-}
-
-
-static void buffer_io_error(struct buffer_head *bh)
+static void buffer_io_error(struct buffer_head *bh, char *msg)
 {
 	char b[BDEVNAME_SIZE];
-	printk(KERN_ERR "Buffer I/O error on device %s, logical block %Lu\n",
+
+	if (!test_bit(BH_Quiet, &bh->b_state))
+		printk_ratelimited(KERN_ERR
+			"Buffer I/O error on dev %s, logical block %llu%s\n",
 			bdevname(bh->b_bdev, b),
-			(unsigned long long)bh->b_blocknr);
+			(unsigned long long)bh->b_blocknr, msg);
 }
 
 /*
@@ -177,17 +171,10 @@ EXPORT_SYMBOL(end_buffer_read_sync);
 
 void end_buffer_write_sync(struct buffer_head *bh, int uptodate)
 {
-	char b[BDEVNAME_SIZE];
-
 	if (uptodate) {
 		set_buffer_uptodate(bh);
 	} else {
-		if (!quiet_error(bh)) {
-			buffer_io_error(bh);
-			printk(KERN_WARNING "lost page write due to "
-					"I/O error on %s\n",
-				       bdevname(bh->b_bdev, b));
-		}
+		buffer_io_error(bh, ", lost sync page write");
 		set_buffer_write_io_error(bh);
 		clear_buffer_uptodate(bh);
 	}
@@ -304,8 +291,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
 		set_buffer_uptodate(bh);
 	} else {
 		clear_buffer_uptodate(bh);
-		if (!quiet_error(bh))
-			buffer_io_error(bh);
+		buffer_io_error(bh, ", async page read");
 		SetPageError(page);
 	}
 
@@ -353,7 +339,6 @@ still_busy:
  */
 void end_buffer_async_write(struct buffer_head *bh, int uptodate)
 {
-	char b[BDEVNAME_SIZE];
 	unsigned long flags;
 	struct buffer_head *first;
 	struct buffer_head *tmp;
@@ -365,12 +350,7 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
 	if (uptodate) {
 		set_buffer_uptodate(bh);
 	} else {
-		if (!quiet_error(bh)) {
-			buffer_io_error(bh);
-			printk(KERN_WARNING "lost page write due to "
-					"I/O error on %s\n",
-			       bdevname(bh->b_bdev, b));
-		}
+		buffer_io_error(bh, ", lost async page write");
 		set_bit(AS_EIO, &page->mapping->flags);
 		set_buffer_write_io_error(bh);
 		clear_buffer_uptodate(bh);
@@ -993,7 +973,7 @@ init_page_buffers(struct page *page, struct block_device *bdev,
  */
 static int
 grow_dev_page(struct block_device *bdev, sector_t block,
-		pgoff_t index, int size, int sizebits)
+	      pgoff_t index, int size, int sizebits, gfp_t gfp)
 {
 	struct inode *inode = bdev->bd_inode;
 	struct page *page;
@@ -1002,8 +982,8 @@ grow_dev_page(struct block_device *bdev, sector_t block,
 	int ret = 0;		/* Will call free_more_memory() */
 	gfp_t gfp_mask;
 
-	gfp_mask = mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS;
-	gfp_mask |= __GFP_MOVABLE;
+	gfp_mask = (mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS) | gfp;
+
 	/*
 	 * XXX: __getblk_slow() can not really deal with failure and
 	 * will endlessly loop on improvised global reclaim.  Prefer
@@ -1060,7 +1040,7 @@ failed:
  * that page was dirty, the buffers are set dirty also.
  */
 static int
-grow_buffers(struct block_device *bdev, sector_t block, int size)
+grow_buffers(struct block_device *bdev, sector_t block, int size, gfp_t gfp)
 {
 	pgoff_t index;
 	int sizebits;
@@ -1087,11 +1067,12 @@ grow_buffers(struct block_device *bdev, sector_t block, int size)
 	}
 
 	/* Create a page with the proper size buffers.. */
-	return grow_dev_page(bdev, block, index, size, sizebits);
+	return grow_dev_page(bdev, block, index, size, sizebits, gfp);
 }
 
-static struct buffer_head *
-__getblk_slow(struct block_device *bdev, sector_t block, int size)
+struct buffer_head *
+__getblk_slow(struct block_device *bdev, sector_t block,
+	     unsigned size, gfp_t gfp)
 {
 	/* Size must be multiple of hard sectorsize */
 	if (unlikely(size & (bdev_logical_block_size(bdev)-1) ||
@@ -1113,13 +1094,14 @@ __getblk_slow(struct block_device *bdev, sector_t block, int size)
 		if (bh)
 			return bh;
 
-		ret = grow_buffers(bdev, block, size);
+		ret = grow_buffers(bdev, block, size, gfp);
 		if (ret < 0)
 			return NULL;
 		if (ret == 0)
 			free_more_memory();
 	}
 }
+EXPORT_SYMBOL(__getblk_slow);
 
 /*
  * The relationship between dirty buffers and dirty pages:
@@ -1373,24 +1355,25 @@ __find_get_block(struct block_device *bdev, sector_t block, unsigned size)
 EXPORT_SYMBOL(__find_get_block);
 
 /*
- * __getblk will locate (and, if necessary, create) the buffer_head
+ * __getblk_gfp() will locate (and, if necessary, create) the buffer_head
  * which corresponds to the passed block_device, block and size. The
  * returned buffer has its reference count incremented.
  *
- * __getblk() will lock up the machine if grow_dev_page's try_to_free_buffers()
- * attempt is failing.  FIXME, perhaps?
+ * __getblk_gfp() will lock up the machine if grow_dev_page's
+ * try_to_free_buffers() attempt is failing.  FIXME, perhaps?
  */
 struct buffer_head *
-__getblk(struct block_device *bdev, sector_t block, unsigned size)
+__getblk_gfp(struct block_device *bdev, sector_t block,
+	     unsigned size, gfp_t gfp)
 {
 	struct buffer_head *bh = __find_get_block(bdev, block, size);
 
 	might_sleep();
 	if (bh == NULL)
-		bh = __getblk_slow(bdev, block, size);
+		bh = __getblk_slow(bdev, block, size, gfp);
 	return bh;
 }
-EXPORT_SYMBOL(__getblk);
+EXPORT_SYMBOL(__getblk_gfp);
 
 /*
  * Do async read-ahead on a buffer..
@@ -1406,24 +1389,28 @@ void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
 EXPORT_SYMBOL(__breadahead);
 
 /**
- *  __bread() - reads a specified block and returns the bh
+ *  __bread_gfp() - reads a specified block and returns the bh
  *  @bdev: the block_device to read from
  *  @block: number of block
  *  @size: size (in bytes) to read
- * 
+ *  @gfp: page allocation flag
+ *
  *  Reads a specified block, and returns buffer head that contains it.
+ *  The page cache can be allocated from non-movable area
+ *  not to prevent page migration if you set gfp to zero.
  *  It returns NULL if the block was unreadable.
  */
 struct buffer_head *
-__bread(struct block_device *bdev, sector_t block, unsigned size)
+__bread_gfp(struct block_device *bdev, sector_t block,
+		   unsigned size, gfp_t gfp)
 {
-	struct buffer_head *bh = __getblk(bdev, block, size);
+	struct buffer_head *bh = __getblk_gfp(bdev, block, size, gfp);
 
 	if (likely(bh) && !buffer_uptodate(bh))
 		bh = __bread_slow(bh);
 	return bh;
 }
-EXPORT_SYMBOL(__bread);
+EXPORT_SYMBOL(__bread_gfp);
 
 /*
  * invalidate_bh_lrus() is called rarely - but not only at unmount.
@@ -2082,6 +2069,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
 			struct page *page, void *fsdata)
 {
 	struct inode *inode = mapping->host;
+	loff_t old_size = inode->i_size;
 	int i_size_changed = 0;
 
 	copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
@@ -2101,6 +2089,8 @@ int generic_write_end(struct file *file, struct address_space *mapping,
 	unlock_page(page);
 	page_cache_release(page);
 
+	if (old_size < pos)
+		pagecache_isize_extended(inode, old_size, pos);
 	/*
 	 * Don't mark the inode dirty under page lock. First, it unnecessarily
 	 * makes the holding time of page lock longer. Second, it forces lock
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 659f2ea9e6f7..cefca661464b 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2638,7 +2638,7 @@ static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
 
 	for (i = 0; i < CEPH_CAP_BITS; i++)
 		if ((dirty & (1 << i)) &&
-		    flush_tid == ci->i_cap_flush_tid[i])
+		    (u16)flush_tid == ci->i_cap_flush_tid[i])
 			cleaned |= 1 << i;
 
 	dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
diff --git a/fs/dcache.c b/fs/dcache.c
index d5a23fd0da90..3ffef7f4e5cd 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2673,11 +2673,13 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
 			if (!IS_ROOT(new)) {
 				spin_unlock(&inode->i_lock);
 				dput(new);
+				iput(inode);
 				return ERR_PTR(-EIO);
 			}
 			if (d_ancestor(new, dentry)) {
 				spin_unlock(&inode->i_lock);
 				dput(new);
+				iput(inode);
 				return ERR_PTR(-EIO);
 			}
 			write_seqlock(&rename_lock);
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 1b119d3bf924..c4cd1fd86cc2 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -566,6 +566,13 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
 	s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
 	s->s_blocksize = path.dentry->d_sb->s_blocksize;
 	s->s_magic = ECRYPTFS_SUPER_MAGIC;
+	s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
+
+	rc = -EINVAL;
+	if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
+		pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
+		goto out_free;
+	}
 
 	inode = ecryptfs_get_inode(path.dentry->d_inode, s);
 	rc = PTR_ERR(inode);
diff --git a/fs/exofs/Kbuild b/fs/exofs/Kbuild
index 389ba8312d5d..b47c7b8dc275 100644
--- a/fs/exofs/Kbuild
+++ b/fs/exofs/Kbuild
@@ -4,7 +4,7 @@
 # Copyright (C) 2008 Panasas Inc.  All rights reserved.
 #
 # Authors:
-#   Boaz Harrosh <bharrosh@panasas.com>
+#   Boaz Harrosh <ooo@electrozaur.com>
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2
diff --git a/fs/exofs/common.h b/fs/exofs/common.h
index 3bbd46956d77..7d88ef566213 100644
--- a/fs/exofs/common.h
+++ b/fs/exofs/common.h
@@ -4,7 +4,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/dir.c b/fs/exofs/dir.c
index 49f51ab4caac..d7defd557601 100644
--- a/fs/exofs/dir.c
+++ b/fs/exofs/dir.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index fffe86fd7a42..ad9cac670a47 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/file.c b/fs/exofs/file.c
index 71bf8e4fb5d4..1a376b42d305 100644
--- a/fs/exofs/file.c
+++ b/fs/exofs/file.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index 3f9cafd73931..f1d3d4eb8c4f 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/namei.c b/fs/exofs/namei.c
index 4731fd991efe..28907460e8fa 100644
--- a/fs/exofs/namei.c
+++ b/fs/exofs/namei.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/ore.c b/fs/exofs/ore.c
index cfc0205d62c4..7bd8ac8dfb28 100644
--- a/fs/exofs/ore.c
+++ b/fs/exofs/ore.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * This file is part of exofs.
  *
@@ -29,7 +29,7 @@
 
 #include "ore_raid.h"
 
-MODULE_AUTHOR("Boaz Harrosh <bharrosh@panasas.com>");
+MODULE_AUTHOR("Boaz Harrosh <ooo@electrozaur.com>");
 MODULE_DESCRIPTION("Objects Raid Engine ore.ko");
 MODULE_LICENSE("GPL");
 
diff --git a/fs/exofs/ore_raid.c b/fs/exofs/ore_raid.c
index 84529b8a331b..27cbdb697649 100644
--- a/fs/exofs/ore_raid.c
+++ b/fs/exofs/ore_raid.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2011
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * This file is part of the objects raid engine (ore).
  *
diff --git a/fs/exofs/ore_raid.h b/fs/exofs/ore_raid.h
index cf6375d82129..a6e746775570 100644
--- a/fs/exofs/ore_raid.h
+++ b/fs/exofs/ore_raid.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) from 2011
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * This file is part of the objects raid engine (ore).
  *
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index ed73ed8ebbee..95965503afcb 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/symlink.c b/fs/exofs/symlink.c
index 4dd687c3e747..832e2624b80b 100644
--- a/fs/exofs/symlink.c
+++ b/fs/exofs/symlink.c
@@ -2,7 +2,7 @@
  * Copyright (C) 2005, 2006
  * Avishay Traeger (avishay@gmail.com)
  * Copyright (C) 2008, 2009
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * Copyrights for code taken from ext2:
  *     Copyright (C) 1992, 1993, 1994, 1995
diff --git a/fs/exofs/sys.c b/fs/exofs/sys.c
index 1b4f2f95fc37..5e6a2c0a1f0b 100644
--- a/fs/exofs/sys.c
+++ b/fs/exofs/sys.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (C) 2012
  * Sachin Bhamare <sbhamare@panasas.com>
- * Boaz Harrosh <bharrosh@panasas.com>
+ * Boaz Harrosh <ooo@electrozaur.com>
  *
  * This file is part of exofs.
  *
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 7015db0bafd1..eb742d0e67ff 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -1354,13 +1354,6 @@ set_qf_format:
 					"not specified.");
 			return 0;
 		}
-	} else {
-		if (sbi->s_jquota_fmt) {
-			ext3_msg(sb, KERN_ERR, "error: journaled quota format "
-					"specified with no journaling "
-					"enabled.");
-			return 0;
-		}
 	}
 #endif
 	return 1;
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 581ef40fbe90..83a6f497c4e0 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -176,7 +176,7 @@ static unsigned int num_clusters_in_group(struct super_block *sb,
 }
 
 /* Initializes an uninitialized block bitmap */
-static void ext4_init_block_bitmap(struct super_block *sb,
+static int ext4_init_block_bitmap(struct super_block *sb,
 				   struct buffer_head *bh,
 				   ext4_group_t block_group,
 				   struct ext4_group_desc *gdp)
@@ -192,7 +192,6 @@ static void ext4_init_block_bitmap(struct super_block *sb,
 	/* If checksum is bad mark all blocks used to prevent allocation
 	 * essentially implementing a per-group read-only flag. */
 	if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
-		ext4_error(sb, "Checksum bad for group %u", block_group);
 		grp = ext4_get_group_info(sb, block_group);
 		if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
 			percpu_counter_sub(&sbi->s_freeclusters_counter,
@@ -205,7 +204,7 @@ static void ext4_init_block_bitmap(struct super_block *sb,
 					   count);
 		}
 		set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
-		return;
+		return -EIO;
 	}
 	memset(bh->b_data, 0, sb->s_blocksize);
 
@@ -243,6 +242,7 @@ static void ext4_init_block_bitmap(struct super_block *sb,
 			     sb->s_blocksize * 8, bh->b_data);
 	ext4_block_bitmap_csum_set(sb, block_group, gdp, bh);
 	ext4_group_desc_csum_set(sb, block_group, gdp);
+	return 0;
 }
 
 /* Return the number of free blocks in a block group.  It is used when
@@ -438,11 +438,15 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group)
 	}
 	ext4_lock_group(sb, block_group);
 	if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
-		ext4_init_block_bitmap(sb, bh, block_group, desc);
+		int err;
+
+		err = ext4_init_block_bitmap(sb, bh, block_group, desc);
 		set_bitmap_uptodate(bh);
 		set_buffer_uptodate(bh);
 		ext4_unlock_group(sb, block_group);
 		unlock_buffer(bh);
+		if (err)
+			ext4_error(sb, "Checksum bad for grp %u", block_group);
 		return bh;
 	}
 	ext4_unlock_group(sb, block_group);
@@ -636,8 +640,7 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
 	 * Account for the allocated meta blocks.  We will never
 	 * fail EDQUOT for metdata, but we do account for it.
 	 */
-	if (!(*errp) &&
-	    ext4_test_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED)) {
+	if (!(*errp) && (flags & EXT4_MB_DELALLOC_RESERVED)) {
 		spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
 		spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
 		dquot_alloc_block_nofail(inode,
diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
index 3285aa5a706a..b610779a958c 100644
--- a/fs/ext4/bitmap.c
+++ b/fs/ext4/bitmap.c
@@ -24,8 +24,7 @@ int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
 	__u32 provided, calculated;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return 1;
 
 	provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
@@ -46,8 +45,7 @@ void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
 	__u32 csum;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return;
 
 	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
@@ -65,8 +63,7 @@ int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return 1;
 
 	provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
@@ -91,8 +88,7 @@ void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
 	__u32 csum;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return;
 
 	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 0bb3f9ea0832..c24143ea9c08 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -151,13 +151,11 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
 					&file->f_ra, file,
 					index, 1);
 			file->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT;
-			bh = ext4_bread(NULL, inode, map.m_lblk, 0, &err);
+			bh = ext4_bread(NULL, inode, map.m_lblk, 0);
+			if (IS_ERR(bh))
+				return PTR_ERR(bh);
 		}
 
-		/*
-		 * We ignore I/O errors on directories so users have a chance
-		 * of recovering data when there's a bad sector
-		 */
 		if (!bh) {
 			if (!dir_has_error) {
 				EXT4_ERROR_FILE(file, 0,
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b0c225cdb52c..c55a1faaed58 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -572,15 +572,15 @@ enum {
 
 /*
  * The bit position of these flags must not overlap with any of the
- * EXT4_GET_BLOCKS_*.  They are used by ext4_ext_find_extent(),
+ * EXT4_GET_BLOCKS_*.  They are used by ext4_find_extent(),
  * read_extent_tree_block(), ext4_split_extent_at(),
  * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
  * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
  * caching the extents when reading from the extent tree while a
  * truncate or punch hole operation is in progress.
  */
-#define EXT4_EX_NOCACHE				0x0400
-#define EXT4_EX_FORCE_CACHE			0x0800
+#define EXT4_EX_NOCACHE				0x40000000
+#define EXT4_EX_FORCE_CACHE			0x20000000
 
 /*
  * Flags used by ext4_free_blocks
@@ -890,6 +890,7 @@ struct ext4_inode_info {
 	struct ext4_es_tree i_es_tree;
 	rwlock_t i_es_lock;
 	struct list_head i_es_lru;
+	unsigned int i_es_all_nr;	/* protected by i_es_lock */
 	unsigned int i_es_lru_nr;	/* protected by i_es_lock */
 	unsigned long i_touch_when;	/* jiffies of last accessing */
 
@@ -1174,6 +1175,9 @@ struct ext4_super_block {
 #define EXT4_MF_MNTDIR_SAMPLED	0x0001
 #define EXT4_MF_FS_ABORTED	0x0002	/* Fatal error detected */
 
+/* Number of quota types we support */
+#define EXT4_MAXQUOTAS 2
+
 /*
  * fourth extended-fs super-block data in memory
  */
@@ -1237,7 +1241,7 @@ struct ext4_sb_info {
 	u32 s_min_batch_time;
 	struct block_device *journal_bdev;
 #ifdef CONFIG_QUOTA
-	char *s_qf_names[MAXQUOTAS];		/* Names of quota files with journalled quota */
+	char *s_qf_names[EXT4_MAXQUOTAS];	/* Names of quota files with journalled quota */
 	int s_jquota_fmt;			/* Format of quota to use */
 #endif
 	unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
@@ -1330,8 +1334,7 @@ struct ext4_sb_info {
 	/* Reclaim extents from extent status tree */
 	struct shrinker s_es_shrinker;
 	struct list_head s_es_lru;
-	unsigned long s_es_last_sorted;
-	struct percpu_counter s_extent_cache_cnt;
+	struct ext4_es_stats s_es_stats;
 	struct mb_cache *s_mb_cache;
 	spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
 
@@ -1399,7 +1402,6 @@ enum {
 	EXT4_STATE_EXT_MIGRATE,		/* Inode is migrating */
 	EXT4_STATE_DIO_UNWRITTEN,	/* need convert on dio done*/
 	EXT4_STATE_NEWENTRY,		/* File just added to dir */
-	EXT4_STATE_DELALLOC_RESERVED,	/* blks already reserved for delalloc */
 	EXT4_STATE_DIOREAD_LOCK,	/* Disable support for dio read
 					   nolocking */
 	EXT4_STATE_MAY_INLINE_DATA,	/* may have in-inode data */
@@ -2086,10 +2088,8 @@ extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
 
 /* inode.c */
-struct buffer_head *ext4_getblk(handle_t *, struct inode *,
-						ext4_lblk_t, int, int *);
-struct buffer_head *ext4_bread(handle_t *, struct inode *,
-						ext4_lblk_t, int, int *);
+struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
+struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
 int ext4_get_block_write(struct inode *inode, sector_t iblock,
 			 struct buffer_head *bh_result, int create);
 int ext4_get_block(struct inode *inode, sector_t iblock,
@@ -2109,6 +2109,7 @@ int do_journal_get_write_access(handle_t *handle,
 #define CONVERT_INLINE_DATA	 2
 
 extern struct inode *ext4_iget(struct super_block *, unsigned long);
+extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
 extern int  ext4_write_inode(struct inode *, struct writeback_control *);
 extern int  ext4_setattr(struct dentry *, struct iattr *);
 extern int  ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
@@ -2332,10 +2333,18 @@ extern int ext4_register_li_request(struct super_block *sb,
 static inline int ext4_has_group_desc_csum(struct super_block *sb)
 {
 	return EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					  EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
-					  EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
+					  EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
+	       (EXT4_SB(sb)->s_chksum_driver != NULL);
 }
 
+static inline int ext4_has_metadata_csum(struct super_block *sb)
+{
+	WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
+			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
+		     !EXT4_SB(sb)->s_chksum_driver);
+
+	return (EXT4_SB(sb)->s_chksum_driver != NULL);
+}
 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
 {
 	return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
@@ -2731,21 +2740,26 @@ extern int ext4_can_extents_be_merged(struct inode *inode,
 				      struct ext4_extent *ex1,
 				      struct ext4_extent *ex2);
 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
-				  struct ext4_ext_path *,
+				  struct ext4_ext_path **,
 				  struct ext4_extent *, int);
-extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
-						  struct ext4_ext_path *,
-						  int flags);
+extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
+					      struct ext4_ext_path **,
+					      int flags);
 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
 extern int ext4_ext_check_inode(struct inode *inode);
 extern int ext4_find_delalloc_range(struct inode *inode,
 				    ext4_lblk_t lblk_start,
 				    ext4_lblk_t lblk_end);
 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
+extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 			__u64 start, __u64 len);
 extern int ext4_ext_precache(struct inode *inode);
 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
+extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
+				struct inode *inode2, ext4_lblk_t lblk1,
+			     ext4_lblk_t lblk2,  ext4_lblk_t count,
+			     int mark_unwritten,int *err);
 
 /* move_extent.c */
 extern void ext4_double_down_write_data_sem(struct inode *first,
@@ -2755,8 +2769,6 @@ extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
 			     __u64 start_orig, __u64 start_donor,
 			     __u64 len, __u64 *moved_len);
-extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
-			    struct ext4_extent **extent);
 
 /* page-io.c */
 extern int __init ext4_init_pageio(void);
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h
index a867f5ca9991..3c9381547094 100644
--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -123,6 +123,7 @@ find_ext4_extent_tail(struct ext4_extent_header *eh)
 struct ext4_ext_path {
 	ext4_fsblk_t			p_block;
 	__u16				p_depth;
+	__u16				p_maxdepth;
 	struct ext4_extent		*p_ext;
 	struct ext4_extent_idx		*p_idx;
 	struct ext4_extent_header	*p_hdr;
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index 0074e0d23d6e..3445035c7e01 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -256,8 +256,8 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
 	set_buffer_prio(bh);
 	if (ext4_handle_valid(handle)) {
 		err = jbd2_journal_dirty_metadata(handle, bh);
-		/* Errors can only happen if there is a bug */
-		if (WARN_ON_ONCE(err)) {
+		/* Errors can only happen due to aborted journal or a nasty bug */
+		if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
 			ext4_journal_abort_handle(where, line, __func__, bh,
 						  handle, err);
 			if (inode == NULL) {
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index 17c00ff202f2..9c5b49fb281e 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -102,9 +102,9 @@
 #define EXT4_QUOTA_INIT_BLOCKS(sb) 0
 #define EXT4_QUOTA_DEL_BLOCKS(sb) 0
 #endif
-#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
-#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
-#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
+#define EXT4_MAXQUOTAS_TRANS_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_TRANS_BLOCKS(sb))
+#define EXT4_MAXQUOTAS_INIT_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_INIT_BLOCKS(sb))
+#define EXT4_MAXQUOTAS_DEL_BLOCKS(sb) (EXT4_MAXQUOTAS*EXT4_QUOTA_DEL_BLOCKS(sb))
 
 static inline int ext4_jbd2_credits_xattr(struct inode *inode)
 {
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 74292a71b384..0b16fb4c06d3 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -73,8 +73,7 @@ static int ext4_extent_block_csum_verify(struct inode *inode,
 {
 	struct ext4_extent_tail *et;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return 1;
 
 	et = find_ext4_extent_tail(eh);
@@ -88,8 +87,7 @@ static void ext4_extent_block_csum_set(struct inode *inode,
 {
 	struct ext4_extent_tail *et;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return;
 
 	et = find_ext4_extent_tail(eh);
@@ -98,14 +96,14 @@ static void ext4_extent_block_csum_set(struct inode *inode,
 
 static int ext4_split_extent(handle_t *handle,
 				struct inode *inode,
-				struct ext4_ext_path *path,
+				struct ext4_ext_path **ppath,
 				struct ext4_map_blocks *map,
 				int split_flag,
 				int flags);
 
 static int ext4_split_extent_at(handle_t *handle,
 			     struct inode *inode,
-			     struct ext4_ext_path *path,
+			     struct ext4_ext_path **ppath,
 			     ext4_lblk_t split,
 			     int split_flag,
 			     int flags);
@@ -291,6 +289,20 @@ static inline int ext4_ext_space_root_idx(struct inode *inode, int check)
 	return size;
 }
 
+static inline int
+ext4_force_split_extent_at(handle_t *handle, struct inode *inode,
+			   struct ext4_ext_path **ppath, ext4_lblk_t lblk,
+			   int nofail)
+{
+	struct ext4_ext_path *path = *ppath;
+	int unwritten = ext4_ext_is_unwritten(path[path->p_depth].p_ext);
+
+	return ext4_split_extent_at(handle, inode, ppath, lblk, unwritten ?
+			EXT4_EXT_MARK_UNWRIT1|EXT4_EXT_MARK_UNWRIT2 : 0,
+			EXT4_EX_NOCACHE | EXT4_GET_BLOCKS_PRE_IO |
+			(nofail ? EXT4_GET_BLOCKS_METADATA_NOFAIL:0));
+}
+
 /*
  * Calculate the number of metadata blocks needed
  * to allocate @blocks
@@ -695,9 +707,11 @@ static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path,
 
 void ext4_ext_drop_refs(struct ext4_ext_path *path)
 {
-	int depth = path->p_depth;
-	int i;
+	int depth, i;
 
+	if (!path)
+		return;
+	depth = path->p_depth;
 	for (i = 0; i <= depth; i++, path++)
 		if (path->p_bh) {
 			brelse(path->p_bh);
@@ -841,24 +855,32 @@ int ext4_ext_tree_init(handle_t *handle, struct inode *inode)
 }
 
 struct ext4_ext_path *
-ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
-		     struct ext4_ext_path *path, int flags)
+ext4_find_extent(struct inode *inode, ext4_lblk_t block,
+		 struct ext4_ext_path **orig_path, int flags)
 {
 	struct ext4_extent_header *eh;
 	struct buffer_head *bh;
-	short int depth, i, ppos = 0, alloc = 0;
+	struct ext4_ext_path *path = orig_path ? *orig_path : NULL;
+	short int depth, i, ppos = 0;
 	int ret;
 
 	eh = ext_inode_hdr(inode);
 	depth = ext_depth(inode);
 
-	/* account possible depth increase */
+	if (path) {
+		ext4_ext_drop_refs(path);
+		if (depth > path[0].p_maxdepth) {
+			kfree(path);
+			*orig_path = path = NULL;
+		}
+	}
 	if (!path) {
+		/* account possible depth increase */
 		path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 2),
 				GFP_NOFS);
-		if (!path)
+		if (unlikely(!path))
 			return ERR_PTR(-ENOMEM);
-		alloc = 1;
+		path[0].p_maxdepth = depth + 1;
 	}
 	path[0].p_hdr = eh;
 	path[0].p_bh = NULL;
@@ -876,7 +898,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
 
 		bh = read_extent_tree_block(inode, path[ppos].p_block, --i,
 					    flags);
-		if (IS_ERR(bh)) {
+		if (unlikely(IS_ERR(bh))) {
 			ret = PTR_ERR(bh);
 			goto err;
 		}
@@ -910,8 +932,9 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
 
 err:
 	ext4_ext_drop_refs(path);
-	if (alloc)
-		kfree(path);
+	kfree(path);
+	if (orig_path)
+		*orig_path = NULL;
 	return ERR_PTR(ret);
 }
 
@@ -1238,16 +1261,24 @@ cleanup:
  *   just created block
  */
 static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
-				 unsigned int flags,
-				 struct ext4_extent *newext)
+				 unsigned int flags)
 {
 	struct ext4_extent_header *neh;
 	struct buffer_head *bh;
-	ext4_fsblk_t newblock;
+	ext4_fsblk_t newblock, goal = 0;
+	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
 	int err = 0;
 
-	newblock = ext4_ext_new_meta_block(handle, inode, NULL,
-		newext, &err, flags);
+	/* Try to prepend new index to old one */
+	if (ext_depth(inode))
+		goal = ext4_idx_pblock(EXT_FIRST_INDEX(ext_inode_hdr(inode)));
+	if (goal > le32_to_cpu(es->s_first_data_block)) {
+		flags |= EXT4_MB_HINT_TRY_GOAL;
+		goal--;
+	} else
+		goal = ext4_inode_to_goal_block(inode);
+	newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
+					NULL, &err);
 	if (newblock == 0)
 		return err;
 
@@ -1314,9 +1345,10 @@ out:
 static int ext4_ext_create_new_leaf(handle_t *handle, struct inode *inode,
 				    unsigned int mb_flags,
 				    unsigned int gb_flags,
-				    struct ext4_ext_path *path,
+				    struct ext4_ext_path **ppath,
 				    struct ext4_extent *newext)
 {
+	struct ext4_ext_path *path = *ppath;
 	struct ext4_ext_path *curp;
 	int depth, i, err = 0;
 
@@ -1340,23 +1372,21 @@ repeat:
 			goto out;
 
 		/* refill path */
-		ext4_ext_drop_refs(path);
-		path = ext4_ext_find_extent(inode,
+		path = ext4_find_extent(inode,
 				    (ext4_lblk_t)le32_to_cpu(newext->ee_block),
-				    path, gb_flags);
+				    ppath, gb_flags);
 		if (IS_ERR(path))
 			err = PTR_ERR(path);
 	} else {
 		/* tree is full, time to grow in depth */
-		err = ext4_ext_grow_indepth(handle, inode, mb_flags, newext);
+		err = ext4_ext_grow_indepth(handle, inode, mb_flags);
 		if (err)
 			goto out;
 
 		/* refill path */
-		ext4_ext_drop_refs(path);
-		path = ext4_ext_find_extent(inode,
+		path = ext4_find_extent(inode,
 				   (ext4_lblk_t)le32_to_cpu(newext->ee_block),
-				    path, gb_flags);
+				    ppath, gb_flags);
 		if (IS_ERR(path)) {
 			err = PTR_ERR(path);
 			goto out;
@@ -1559,7 +1589,7 @@ found_extent:
  * allocated block. Thus, index entries have to be consistent
  * with leaves.
  */
-static ext4_lblk_t
+ext4_lblk_t
 ext4_ext_next_allocated_block(struct ext4_ext_path *path)
 {
 	int depth;
@@ -1802,6 +1832,7 @@ static void ext4_ext_try_to_merge_up(handle_t *handle,
 		sizeof(struct ext4_extent_idx);
 	s += sizeof(struct ext4_extent_header);
 
+	path[1].p_maxdepth = path[0].p_maxdepth;
 	memcpy(path[0].p_hdr, path[1].p_hdr, s);
 	path[0].p_depth = 0;
 	path[0].p_ext = EXT_FIRST_EXTENT(path[0].p_hdr) +
@@ -1896,9 +1927,10 @@ out:
  * creating new leaf in the no-space case.
  */
 int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
-				struct ext4_ext_path *path,
+				struct ext4_ext_path **ppath,
 				struct ext4_extent *newext, int gb_flags)
 {
+	struct ext4_ext_path *path = *ppath;
 	struct ext4_extent_header *eh;
 	struct ext4_extent *ex, *fex;
 	struct ext4_extent *nearex; /* nearest extent */
@@ -1907,6 +1939,8 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
 	ext4_lblk_t next;
 	int mb_flags = 0, unwritten;
 
+	if (gb_flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+		mb_flags |= EXT4_MB_DELALLOC_RESERVED;
 	if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
 		EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
 		return -EIO;
@@ -1925,7 +1959,7 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
 		/*
 		 * Try to see whether we should rather test the extent on
 		 * right from ex, or from the left of ex. This is because
-		 * ext4_ext_find_extent() can return either extent on the
+		 * ext4_find_extent() can return either extent on the
 		 * left, or on the right from the searched position. This
 		 * will make merging more effective.
 		 */
@@ -2008,7 +2042,7 @@ prepend:
 	if (next != EXT_MAX_BLOCKS) {
 		ext_debug("next leaf block - %u\n", next);
 		BUG_ON(npath != NULL);
-		npath = ext4_ext_find_extent(inode, next, NULL, 0);
+		npath = ext4_find_extent(inode, next, NULL, 0);
 		if (IS_ERR(npath))
 			return PTR_ERR(npath);
 		BUG_ON(npath->p_depth != path->p_depth);
@@ -2028,9 +2062,9 @@ prepend:
 	 * We're gonna add a new leaf in the tree.
 	 */
 	if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
-		mb_flags = EXT4_MB_USE_RESERVED;
+		mb_flags |= EXT4_MB_USE_RESERVED;
 	err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
-				       path, newext);
+				       ppath, newext);
 	if (err)
 		goto cleanup;
 	depth = ext_depth(inode);
@@ -2108,10 +2142,8 @@ merge:
 	err = ext4_ext_dirty(handle, inode, path + path->p_depth);
 
 cleanup:
-	if (npath) {
-		ext4_ext_drop_refs(npath);
-		kfree(npath);
-	}
+	ext4_ext_drop_refs(npath);
+	kfree(npath);
 	return err;
 }
 
@@ -2133,13 +2165,7 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
 		/* find extent for this block */
 		down_read(&EXT4_I(inode)->i_data_sem);
 
-		if (path && ext_depth(inode) != depth) {
-			/* depth was changed. we have to realloc path */
-			kfree(path);
-			path = NULL;
-		}
-
-		path = ext4_ext_find_extent(inode, block, path, 0);
+		path = ext4_find_extent(inode, block, &path, 0);
 		if (IS_ERR(path)) {
 			up_read(&EXT4_I(inode)->i_data_sem);
 			err = PTR_ERR(path);
@@ -2156,7 +2182,6 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
 		}
 		ex = path[depth].p_ext;
 		next = ext4_ext_next_allocated_block(path);
-		ext4_ext_drop_refs(path);
 
 		flags = 0;
 		exists = 0;
@@ -2266,11 +2291,8 @@ static int ext4_fill_fiemap_extents(struct inode *inode,
 		block = es.es_lblk + es.es_len;
 	}
 
-	if (path) {
-		ext4_ext_drop_refs(path);
-		kfree(path);
-	}
-
+	ext4_ext_drop_refs(path);
+	kfree(path);
 	return err;
 }
 
@@ -2826,7 +2848,7 @@ again:
 		ext4_lblk_t ee_block;
 
 		/* find extent for this block */
-		path = ext4_ext_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
+		path = ext4_find_extent(inode, end, NULL, EXT4_EX_NOCACHE);
 		if (IS_ERR(path)) {
 			ext4_journal_stop(handle);
 			return PTR_ERR(path);
@@ -2854,24 +2876,14 @@ again:
 		 */
 		if (end >= ee_block &&
 		    end < ee_block + ext4_ext_get_actual_len(ex) - 1) {
-			int split_flag = 0;
-
-			if (ext4_ext_is_unwritten(ex))
-				split_flag = EXT4_EXT_MARK_UNWRIT1 |
-					     EXT4_EXT_MARK_UNWRIT2;
-
 			/*
 			 * Split the extent in two so that 'end' is the last
 			 * block in the first new extent. Also we should not
 			 * fail removing space due to ENOSPC so try to use
 			 * reserved block if that happens.
 			 */
-			err = ext4_split_extent_at(handle, inode, path,
-					end + 1, split_flag,
-					EXT4_EX_NOCACHE |
-					EXT4_GET_BLOCKS_PRE_IO |
-					EXT4_GET_BLOCKS_METADATA_NOFAIL);
-
+			err = ext4_force_split_extent_at(handle, inode, &path,
+							 end + 1, 1);
 			if (err < 0)
 				goto out;
 		}
@@ -2893,7 +2905,7 @@ again:
 			ext4_journal_stop(handle);
 			return -ENOMEM;
 		}
-		path[0].p_depth = depth;
+		path[0].p_maxdepth = path[0].p_depth = depth;
 		path[0].p_hdr = ext_inode_hdr(inode);
 		i = 0;
 
@@ -3013,10 +3025,9 @@ again:
 out:
 	ext4_ext_drop_refs(path);
 	kfree(path);
-	if (err == -EAGAIN) {
-		path = NULL;
+	path = NULL;
+	if (err == -EAGAIN)
 		goto again;
-	}
 	ext4_journal_stop(handle);
 
 	return err;
@@ -3130,11 +3141,12 @@ static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
  */
 static int ext4_split_extent_at(handle_t *handle,
 			     struct inode *inode,
-			     struct ext4_ext_path *path,
+			     struct ext4_ext_path **ppath,
 			     ext4_lblk_t split,
 			     int split_flag,
 			     int flags)
 {
+	struct ext4_ext_path *path = *ppath;
 	ext4_fsblk_t newblock;
 	ext4_lblk_t ee_block;
 	struct ext4_extent *ex, newex, orig_ex, zero_ex;
@@ -3205,7 +3217,7 @@ static int ext4_split_extent_at(handle_t *handle,
 	if (split_flag & EXT4_EXT_MARK_UNWRIT2)
 		ext4_ext_mark_unwritten(ex2);
 
-	err = ext4_ext_insert_extent(handle, inode, path, &newex, flags);
+	err = ext4_ext_insert_extent(handle, inode, ppath, &newex, flags);
 	if (err == -ENOSPC && (EXT4_EXT_MAY_ZEROOUT & split_flag)) {
 		if (split_flag & (EXT4_EXT_DATA_VALID1|EXT4_EXT_DATA_VALID2)) {
 			if (split_flag & EXT4_EXT_DATA_VALID1) {
@@ -3271,11 +3283,12 @@ fix_extent_len:
  */
 static int ext4_split_extent(handle_t *handle,
 			      struct inode *inode,
-			      struct ext4_ext_path *path,
+			      struct ext4_ext_path **ppath,
 			      struct ext4_map_blocks *map,
 			      int split_flag,
 			      int flags)
 {
+	struct ext4_ext_path *path = *ppath;
 	ext4_lblk_t ee_block;
 	struct ext4_extent *ex;
 	unsigned int ee_len, depth;
@@ -3298,7 +3311,7 @@ static int ext4_split_extent(handle_t *handle,
 				       EXT4_EXT_MARK_UNWRIT2;
 		if (split_flag & EXT4_EXT_DATA_VALID2)
 			split_flag1 |= EXT4_EXT_DATA_VALID1;
-		err = ext4_split_extent_at(handle, inode, path,
+		err = ext4_split_extent_at(handle, inode, ppath,
 				map->m_lblk + map->m_len, split_flag1, flags1);
 		if (err)
 			goto out;
@@ -3309,8 +3322,7 @@ static int ext4_split_extent(handle_t *handle,
 	 * Update path is required because previous ext4_split_extent_at() may
 	 * result in split of original leaf or extent zeroout.
 	 */
-	ext4_ext_drop_refs(path);
-	path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
+	path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
 	if (IS_ERR(path))
 		return PTR_ERR(path);
 	depth = ext_depth(inode);
@@ -3330,7 +3342,7 @@ static int ext4_split_extent(handle_t *handle,
 			split_flag1 |= split_flag & (EXT4_EXT_MAY_ZEROOUT |
 						     EXT4_EXT_MARK_UNWRIT2);
 		}
-		err = ext4_split_extent_at(handle, inode, path,
+		err = ext4_split_extent_at(handle, inode, ppath,
 				map->m_lblk, split_flag1, flags);
 		if (err)
 			goto out;
@@ -3364,9 +3376,10 @@ out:
 static int ext4_ext_convert_to_initialized(handle_t *handle,
 					   struct inode *inode,
 					   struct ext4_map_blocks *map,
-					   struct ext4_ext_path *path,
+					   struct ext4_ext_path **ppath,
 					   int flags)
 {
+	struct ext4_ext_path *path = *ppath;
 	struct ext4_sb_info *sbi;
 	struct ext4_extent_header *eh;
 	struct ext4_map_blocks split_map;
@@ -3590,11 +3603,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
 		}
 	}
 
-	allocated = ext4_split_extent(handle, inode, path,
-				      &split_map, split_flag, flags);
-	if (allocated < 0)
-		err = allocated;
-
+	err = ext4_split_extent(handle, inode, ppath, &split_map, split_flag,
+				flags);
+	if (err > 0)
+		err = 0;
 out:
 	/* If we have gotten a failure, don't zero out status tree */
 	if (!err)
@@ -3629,9 +3641,10 @@ out:
 static int ext4_split_convert_extents(handle_t *handle,
 					struct inode *inode,
 					struct ext4_map_blocks *map,
-					struct ext4_ext_path *path,
+					struct ext4_ext_path **ppath,
 					int flags)
 {
+	struct ext4_ext_path *path = *ppath;
 	ext4_lblk_t eof_block;
 	ext4_lblk_t ee_block;
 	struct ext4_extent *ex;
@@ -3665,74 +3678,15 @@ static int ext4_split_convert_extents(handle_t *handle,
 		split_flag |= (EXT4_EXT_MARK_UNWRIT2 | EXT4_EXT_DATA_VALID2);
 	}
 	flags |= EXT4_GET_BLOCKS_PRE_IO;
-	return ext4_split_extent(handle, inode, path, map, split_flag, flags);
+	return ext4_split_extent(handle, inode, ppath, map, split_flag, flags);
 }
 
-static int ext4_convert_initialized_extents(handle_t *handle,
-					    struct inode *inode,
-					    struct ext4_map_blocks *map,
-					    struct ext4_ext_path *path)
-{
-	struct ext4_extent *ex;
-	ext4_lblk_t ee_block;
-	unsigned int ee_len;
-	int depth;
-	int err = 0;
-
-	depth = ext_depth(inode);
-	ex = path[depth].p_ext;
-	ee_block = le32_to_cpu(ex->ee_block);
-	ee_len = ext4_ext_get_actual_len(ex);
-
-	ext_debug("%s: inode %lu, logical"
-		"block %llu, max_blocks %u\n", __func__, inode->i_ino,
-		  (unsigned long long)ee_block, ee_len);
-
-	if (ee_block != map->m_lblk || ee_len > map->m_len) {
-		err = ext4_split_convert_extents(handle, inode, map, path,
-				EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
-		if (err < 0)
-			goto out;
-		ext4_ext_drop_refs(path);
-		path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
-		if (IS_ERR(path)) {
-			err = PTR_ERR(path);
-			goto out;
-		}
-		depth = ext_depth(inode);
-		ex = path[depth].p_ext;
-		if (!ex) {
-			EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
-					 (unsigned long) map->m_lblk);
-			err = -EIO;
-			goto out;
-		}
-	}
-
-	err = ext4_ext_get_access(handle, inode, path + depth);
-	if (err)
-		goto out;
-	/* first mark the extent as unwritten */
-	ext4_ext_mark_unwritten(ex);
-
-	/* note: ext4_ext_correct_indexes() isn't needed here because
-	 * borders are not changed
-	 */
-	ext4_ext_try_to_merge(handle, inode, path, ex);
-
-	/* Mark modified extent as dirty */
-	err = ext4_ext_dirty(handle, inode, path + path->p_depth);
-out:
-	ext4_ext_show_leaf(inode, path);
-	return err;
-}
-
-
 static int ext4_convert_unwritten_extents_endio(handle_t *handle,
 						struct inode *inode,
 						struct ext4_map_blocks *map,
-						struct ext4_ext_path *path)
+						struct ext4_ext_path **ppath)
 {
+	struct ext4_ext_path *path = *ppath;
 	struct ext4_extent *ex;
 	ext4_lblk_t ee_block;
 	unsigned int ee_len;
@@ -3761,16 +3715,13 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
 			     inode->i_ino, (unsigned long long)ee_block, ee_len,
 			     (unsigned long long)map->m_lblk, map->m_len);
 #endif
-		err = ext4_split_convert_extents(handle, inode, map, path,
+		err = ext4_split_convert_extents(handle, inode, map, ppath,
 						 EXT4_GET_BLOCKS_CONVERT);
 		if (err < 0)
-			goto out;
-		ext4_ext_drop_refs(path);
-		path = ext4_ext_find_extent(inode, map->m_lblk, path, 0);
-		if (IS_ERR(path)) {
-			err = PTR_ERR(path);
-			goto out;
-		}
+			return err;
+		path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
+		if (IS_ERR(path))
+			return PTR_ERR(path);
 		depth = ext_depth(inode);
 		ex = path[depth].p_ext;
 	}
@@ -3963,12 +3914,16 @@ get_reserved_cluster_alloc(struct inode *inode, ext4_lblk_t lblk_start,
 }
 
 static int
-ext4_ext_convert_initialized_extent(handle_t *handle, struct inode *inode,
-			struct ext4_map_blocks *map,
-			struct ext4_ext_path *path, int flags,
-			unsigned int allocated, ext4_fsblk_t newblock)
+convert_initialized_extent(handle_t *handle, struct inode *inode,
+			   struct ext4_map_blocks *map,
+			   struct ext4_ext_path **ppath, int flags,
+			   unsigned int allocated, ext4_fsblk_t newblock)
 {
-	int ret = 0;
+	struct ext4_ext_path *path = *ppath;
+	struct ext4_extent *ex;
+	ext4_lblk_t ee_block;
+	unsigned int ee_len;
+	int depth;
 	int err = 0;
 
 	/*
@@ -3978,28 +3933,67 @@ ext4_ext_convert_initialized_extent(handle_t *handle, struct inode *inode,
 	if (map->m_len > EXT_UNWRITTEN_MAX_LEN)
 		map->m_len = EXT_UNWRITTEN_MAX_LEN / 2;
 
-	ret = ext4_convert_initialized_extents(handle, inode, map,
-						path);
-	if (ret >= 0) {
-		ext4_update_inode_fsync_trans(handle, inode, 1);
-		err = check_eofblocks_fl(handle, inode, map->m_lblk,
-					 path, map->m_len);
-	} else
-		err = ret;
+	depth = ext_depth(inode);
+	ex = path[depth].p_ext;
+	ee_block = le32_to_cpu(ex->ee_block);
+	ee_len = ext4_ext_get_actual_len(ex);
+
+	ext_debug("%s: inode %lu, logical"
+		"block %llu, max_blocks %u\n", __func__, inode->i_ino,
+		  (unsigned long long)ee_block, ee_len);
+
+	if (ee_block != map->m_lblk || ee_len > map->m_len) {
+		err = ext4_split_convert_extents(handle, inode, map, ppath,
+				EXT4_GET_BLOCKS_CONVERT_UNWRITTEN);
+		if (err < 0)
+			return err;
+		path = ext4_find_extent(inode, map->m_lblk, ppath, 0);
+		if (IS_ERR(path))
+			return PTR_ERR(path);
+		depth = ext_depth(inode);
+		ex = path[depth].p_ext;
+		if (!ex) {
+			EXT4_ERROR_INODE(inode, "unexpected hole at %lu",
+					 (unsigned long) map->m_lblk);
+			return -EIO;
+		}
+	}
+
+	err = ext4_ext_get_access(handle, inode, path + depth);
+	if (err)
+		return err;
+	/* first mark the extent as unwritten */
+	ext4_ext_mark_unwritten(ex);
+
+	/* note: ext4_ext_correct_indexes() isn't needed here because
+	 * borders are not changed
+	 */
+	ext4_ext_try_to_merge(handle, inode, path, ex);
+
+	/* Mark modified extent as dirty */
+	err = ext4_ext_dirty(handle, inode, path + path->p_depth);
+	if (err)
+		return err;
+	ext4_ext_show_leaf(inode, path);
+
+	ext4_update_inode_fsync_trans(handle, inode, 1);
+	err = check_eofblocks_fl(handle, inode, map->m_lblk, path, map->m_len);
+	if (err)
+		return err;
 	map->m_flags |= EXT4_MAP_UNWRITTEN;
 	if (allocated > map->m_len)
 		allocated = map->m_len;
 	map->m_len = allocated;
-
-	return err ? err : allocated;
+	return allocated;
 }
 
 static int
 ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 			struct ext4_map_blocks *map,
-			struct ext4_ext_path *path, int flags,
+			struct ext4_ext_path **ppath, int flags,
 			unsigned int allocated, ext4_fsblk_t newblock)
 {
+	struct ext4_ext_path *path = *ppath;
 	int ret = 0;
 	int err = 0;
 	ext4_io_end_t *io = ext4_inode_aio(inode);
@@ -4021,8 +4015,8 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 
 	/* get_block() before submit the IO, split the extent */
 	if (flags & EXT4_GET_BLOCKS_PRE_IO) {
-		ret = ext4_split_convert_extents(handle, inode, map,
-					 path, flags | EXT4_GET_BLOCKS_CONVERT);
+		ret = ext4_split_convert_extents(handle, inode, map, ppath,
+					 flags | EXT4_GET_BLOCKS_CONVERT);
 		if (ret <= 0)
 			goto out;
 		/*
@@ -4040,7 +4034,7 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 	/* IO end_io complete, convert the filled extent to written */
 	if (flags & EXT4_GET_BLOCKS_CONVERT) {
 		ret = ext4_convert_unwritten_extents_endio(handle, inode, map,
-							path);
+							   ppath);
 		if (ret >= 0) {
 			ext4_update_inode_fsync_trans(handle, inode, 1);
 			err = check_eofblocks_fl(handle, inode, map->m_lblk,
@@ -4078,7 +4072,7 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 	}
 
 	/* buffered write, writepage time, convert*/
-	ret = ext4_ext_convert_to_initialized(handle, inode, map, path, flags);
+	ret = ext4_ext_convert_to_initialized(handle, inode, map, ppath, flags);
 	if (ret >= 0)
 		ext4_update_inode_fsync_trans(handle, inode, 1);
 out:
@@ -4279,7 +4273,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 	trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
 
 	/* find extent for this block */
-	path = ext4_ext_find_extent(inode, map->m_lblk, NULL, 0);
+	path = ext4_find_extent(inode, map->m_lblk, NULL, 0);
 	if (IS_ERR(path)) {
 		err = PTR_ERR(path);
 		path = NULL;
@@ -4291,7 +4285,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 	/*
 	 * consistent leaf must not be empty;
 	 * this situation is possible, though, _during_ tree modification;
-	 * this is why assert can't be put in ext4_ext_find_extent()
+	 * this is why assert can't be put in ext4_find_extent()
 	 */
 	if (unlikely(path[depth].p_ext == NULL && depth != 0)) {
 		EXT4_ERROR_INODE(inode, "bad extent address "
@@ -4331,15 +4325,15 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 			 */
 			if ((!ext4_ext_is_unwritten(ex)) &&
 			    (flags & EXT4_GET_BLOCKS_CONVERT_UNWRITTEN)) {
-				allocated = ext4_ext_convert_initialized_extent(
-						handle, inode, map, path, flags,
-						allocated, newblock);
+				allocated = convert_initialized_extent(
+						handle, inode, map, &path,
+						flags, allocated, newblock);
 				goto out2;
 			} else if (!ext4_ext_is_unwritten(ex))
 				goto out;
 
 			ret = ext4_ext_handle_unwritten_extents(
-				handle, inode, map, path, flags,
+				handle, inode, map, &path, flags,
 				allocated, newblock);
 			if (ret < 0)
 				err = ret;
@@ -4376,7 +4370,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 
 	/*
 	 * If we are doing bigalloc, check to see if the extent returned
-	 * by ext4_ext_find_extent() implies a cluster we can use.
+	 * by ext4_find_extent() implies a cluster we can use.
 	 */
 	if (cluster_offset && ex &&
 	    get_implied_cluster_alloc(inode->i_sb, map, ex, path)) {
@@ -4451,6 +4445,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 		ar.flags = 0;
 	if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
 		ar.flags |= EXT4_MB_HINT_NOPREALLOC;
+	if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+		ar.flags |= EXT4_MB_DELALLOC_RESERVED;
 	newblock = ext4_mb_new_blocks(handle, &ar, &err);
 	if (!newblock)
 		goto out2;
@@ -4486,7 +4482,7 @@ got_allocated_blocks:
 		err = check_eofblocks_fl(handle, inode, map->m_lblk,
 					 path, ar.len);
 	if (!err)
-		err = ext4_ext_insert_extent(handle, inode, path,
+		err = ext4_ext_insert_extent(handle, inode, &path,
 					     &newex, flags);
 
 	if (!err && set_unwritten) {
@@ -4619,10 +4615,8 @@ out:
 	map->m_pblk = newblock;
 	map->m_len = allocated;
 out2:
-	if (path) {
-		ext4_ext_drop_refs(path);
-		kfree(path);
-	}
+	ext4_ext_drop_refs(path);
+	kfree(path);
 
 	trace_ext4_ext_map_blocks_exit(inode, flags, map,
 				       err ? err : allocated);
@@ -4799,7 +4793,8 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 		max_blocks -= lblk;
 
 	flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT |
-		EXT4_GET_BLOCKS_CONVERT_UNWRITTEN;
+		EXT4_GET_BLOCKS_CONVERT_UNWRITTEN |
+		EXT4_EX_NOCACHE;
 	if (mode & FALLOC_FL_KEEP_SIZE)
 		flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
 
@@ -4837,15 +4832,21 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 		ext4_inode_block_unlocked_dio(inode);
 		inode_dio_wait(inode);
 
+		ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
+					     flags, mode);
+		if (ret)
+			goto out_dio;
 		/*
 		 * Remove entire range from the extent status tree.
+		 *
+		 * ext4_es_remove_extent(inode, lblk, max_blocks) is
+		 * NOT sufficient.  I'm not sure why this is the case,
+		 * but let's be conservative and remove the extent
+		 * status tree for the entire inode.  There should be
+		 * no outstanding delalloc extents thanks to the
+		 * filemap_write_and_wait_range() call above.
 		 */
-		ret = ext4_es_remove_extent(inode, lblk, max_blocks);
-		if (ret)
-			goto out_dio;
-
-		ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size,
-					     flags, mode);
+		ret = ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
 		if (ret)
 			goto out_dio;
 	}
@@ -5304,36 +5305,31 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 	struct ext4_ext_path *path;
 	int ret = 0, depth;
 	struct ext4_extent *extent;
-	ext4_lblk_t stop_block, current_block;
+	ext4_lblk_t stop_block;
 	ext4_lblk_t ex_start, ex_end;
 
 	/* Let path point to the last extent */
-	path = ext4_ext_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0);
+	path = ext4_find_extent(inode, EXT_MAX_BLOCKS - 1, NULL, 0);
 	if (IS_ERR(path))
 		return PTR_ERR(path);
 
 	depth = path->p_depth;
 	extent = path[depth].p_ext;
-	if (!extent) {
-		ext4_ext_drop_refs(path);
-		kfree(path);
-		return ret;
-	}
+	if (!extent)
+		goto out;
 
 	stop_block = le32_to_cpu(extent->ee_block) +
 			ext4_ext_get_actual_len(extent);
-	ext4_ext_drop_refs(path);
-	kfree(path);
 
 	/* Nothing to shift, if hole is at the end of file */
 	if (start >= stop_block)
-		return ret;
+		goto out;
 
 	/*
 	 * Don't start shifting extents until we make sure the hole is big
 	 * enough to accomodate the shift.
 	 */
-	path = ext4_ext_find_extent(inode, start - 1, NULL, 0);
+	path = ext4_find_extent(inode, start - 1, &path, 0);
 	if (IS_ERR(path))
 		return PTR_ERR(path);
 	depth = path->p_depth;
@@ -5346,8 +5342,6 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 		ex_start = 0;
 		ex_end = 0;
 	}
-	ext4_ext_drop_refs(path);
-	kfree(path);
 
 	if ((start == ex_start && shift > ex_start) ||
 	    (shift > start - ex_end))
@@ -5355,7 +5349,7 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 
 	/* Its safe to start updating extents */
 	while (start < stop_block) {
-		path = ext4_ext_find_extent(inode, start, NULL, 0);
+		path = ext4_find_extent(inode, start, &path, 0);
 		if (IS_ERR(path))
 			return PTR_ERR(path);
 		depth = path->p_depth;
@@ -5365,27 +5359,23 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 					 (unsigned long) start);
 			return -EIO;
 		}
-
-		current_block = le32_to_cpu(extent->ee_block);
-		if (start > current_block) {
+		if (start > le32_to_cpu(extent->ee_block)) {
 			/* Hole, move to the next extent */
-			ret = mext_next_extent(inode, path, &extent);
-			if (ret != 0) {
-				ext4_ext_drop_refs(path);
-				kfree(path);
-				if (ret == 1)
-					ret = 0;
-				break;
+			if (extent < EXT_LAST_EXTENT(path[depth].p_hdr)) {
+				path[depth].p_ext++;
+			} else {
+				start = ext4_ext_next_allocated_block(path);
+				continue;
 			}
 		}
 		ret = ext4_ext_shift_path_extents(path, shift, inode,
 				handle, &start);
-		ext4_ext_drop_refs(path);
-		kfree(path);
 		if (ret)
 			break;
 	}
-
+out:
+	ext4_ext_drop_refs(path);
+	kfree(path);
 	return ret;
 }
 
@@ -5508,3 +5498,199 @@ out_mutex:
 	mutex_unlock(&inode->i_mutex);
 	return ret;
 }
+
+/**
+ * ext4_swap_extents - Swap extents between two inodes
+ *
+ * @inode1:	First inode
+ * @inode2:	Second inode
+ * @lblk1:	Start block for first inode
+ * @lblk2:	Start block for second inode
+ * @count:	Number of blocks to swap
+ * @mark_unwritten: Mark second inode's extents as unwritten after swap
+ * @erp:	Pointer to save error value
+ *
+ * This helper routine does exactly what is promise "swap extents". All other
+ * stuff such as page-cache locking consistency, bh mapping consistency or
+ * extent's data copying must be performed by caller.
+ * Locking:
+ * 		i_mutex is held for both inodes
+ * 		i_data_sem is locked for write for both inodes
+ * Assumptions:
+ *		All pages from requested range are locked for both inodes
+ */
+int
+ext4_swap_extents(handle_t *handle, struct inode *inode1,
+		     struct inode *inode2, ext4_lblk_t lblk1, ext4_lblk_t lblk2,
+		  ext4_lblk_t count, int unwritten, int *erp)
+{
+	struct ext4_ext_path *path1 = NULL;
+	struct ext4_ext_path *path2 = NULL;
+	int replaced_count = 0;
+
+	BUG_ON(!rwsem_is_locked(&EXT4_I(inode1)->i_data_sem));
+	BUG_ON(!rwsem_is_locked(&EXT4_I(inode2)->i_data_sem));
+	BUG_ON(!mutex_is_locked(&inode1->i_mutex));
+	BUG_ON(!mutex_is_locked(&inode1->i_mutex));
+
+	*erp = ext4_es_remove_extent(inode1, lblk1, count);
+	if (unlikely(*erp))
+		return 0;
+	*erp = ext4_es_remove_extent(inode2, lblk2, count);
+	if (unlikely(*erp))
+		return 0;
+
+	while (count) {
+		struct ext4_extent *ex1, *ex2, tmp_ex;
+		ext4_lblk_t e1_blk, e2_blk;
+		int e1_len, e2_len, len;
+		int split = 0;
+
+		path1 = ext4_find_extent(inode1, lblk1, NULL, EXT4_EX_NOCACHE);
+		if (unlikely(IS_ERR(path1))) {
+			*erp = PTR_ERR(path1);
+			path1 = NULL;
+		finish:
+			count = 0;
+			goto repeat;
+		}
+		path2 = ext4_find_extent(inode2, lblk2, NULL, EXT4_EX_NOCACHE);
+		if (unlikely(IS_ERR(path2))) {
+			*erp = PTR_ERR(path2);
+			path2 = NULL;
+			goto finish;
+		}
+		ex1 = path1[path1->p_depth].p_ext;
+		ex2 = path2[path2->p_depth].p_ext;
+		/* Do we have somthing to swap ? */
+		if (unlikely(!ex2 || !ex1))
+			goto finish;
+
+		e1_blk = le32_to_cpu(ex1->ee_block);
+		e2_blk = le32_to_cpu(ex2->ee_block);
+		e1_len = ext4_ext_get_actual_len(ex1);
+		e2_len = ext4_ext_get_actual_len(ex2);
+
+		/* Hole handling */
+		if (!in_range(lblk1, e1_blk, e1_len) ||
+		    !in_range(lblk2, e2_blk, e2_len)) {
+			ext4_lblk_t next1, next2;
+
+			/* if hole after extent, then go to next extent */
+			next1 = ext4_ext_next_allocated_block(path1);
+			next2 = ext4_ext_next_allocated_block(path2);
+			/* If hole before extent, then shift to that extent */
+			if (e1_blk > lblk1)
+				next1 = e1_blk;
+			if (e2_blk > lblk2)
+				next2 = e1_blk;
+			/* Do we have something to swap */
+			if (next1 == EXT_MAX_BLOCKS || next2 == EXT_MAX_BLOCKS)
+				goto finish;
+			/* Move to the rightest boundary */
+			len = next1 - lblk1;
+			if (len < next2 - lblk2)
+				len = next2 - lblk2;
+			if (len > count)
+				len = count;
+			lblk1 += len;
+			lblk2 += len;
+			count -= len;
+			goto repeat;
+		}
+
+		/* Prepare left boundary */
+		if (e1_blk < lblk1) {
+			split = 1;
+			*erp = ext4_force_split_extent_at(handle, inode1,
+						&path1, lblk1, 0);
+			if (unlikely(*erp))
+				goto finish;
+		}
+		if (e2_blk < lblk2) {
+			split = 1;
+			*erp = ext4_force_split_extent_at(handle, inode2,
+						&path2,  lblk2, 0);
+			if (unlikely(*erp))
+				goto finish;
+		}
+		/* ext4_split_extent_at() may result in leaf extent split,
+		 * path must to be revalidated. */
+		if (split)
+			goto repeat;
+
+		/* Prepare right boundary */
+		len = count;
+		if (len > e1_blk + e1_len - lblk1)
+			len = e1_blk + e1_len - lblk1;
+		if (len > e2_blk + e2_len - lblk2)
+			len = e2_blk + e2_len - lblk2;
+
+		if (len != e1_len) {
+			split = 1;
+			*erp = ext4_force_split_extent_at(handle, inode1,
+						&path1, lblk1 + len, 0);
+			if (unlikely(*erp))
+				goto finish;
+		}
+		if (len != e2_len) {
+			split = 1;
+			*erp = ext4_force_split_extent_at(handle, inode2,
+						&path2, lblk2 + len, 0);
+			if (*erp)
+				goto finish;
+		}
+		/* ext4_split_extent_at() may result in leaf extent split,
+		 * path must to be revalidated. */
+		if (split)
+			goto repeat;
+
+		BUG_ON(e2_len != e1_len);
+		*erp = ext4_ext_get_access(handle, inode1, path1 + path1->p_depth);
+		if (unlikely(*erp))
+			goto finish;
+		*erp = ext4_ext_get_access(handle, inode2, path2 + path2->p_depth);
+		if (unlikely(*erp))
+			goto finish;
+
+		/* Both extents are fully inside boundaries. Swap it now */
+		tmp_ex = *ex1;
+		ext4_ext_store_pblock(ex1, ext4_ext_pblock(ex2));
+		ext4_ext_store_pblock(ex2, ext4_ext_pblock(&tmp_ex));
+		ex1->ee_len = cpu_to_le16(e2_len);
+		ex2->ee_len = cpu_to_le16(e1_len);
+		if (unwritten)
+			ext4_ext_mark_unwritten(ex2);
+		if (ext4_ext_is_unwritten(&tmp_ex))
+			ext4_ext_mark_unwritten(ex1);
+
+		ext4_ext_try_to_merge(handle, inode2, path2, ex2);
+		ext4_ext_try_to_merge(handle, inode1, path1, ex1);
+		*erp = ext4_ext_dirty(handle, inode2, path2 +
+				      path2->p_depth);
+		if (unlikely(*erp))
+			goto finish;
+		*erp = ext4_ext_dirty(handle, inode1, path1 +
+				      path1->p_depth);
+		/*
+		 * Looks scarry ah..? second inode already points to new blocks,
+		 * and it was successfully dirtied. But luckily error may happen
+		 * only due to journal error, so full transaction will be
+		 * aborted anyway.
+		 */
+		if (unlikely(*erp))
+			goto finish;
+		lblk1 += len;
+		lblk2 += len;
+		replaced_count += len;
+		count -= len;
+
+	repeat:
+		ext4_ext_drop_refs(path1);
+		kfree(path1);
+		ext4_ext_drop_refs(path2);
+		kfree(path2);
+		path1 = path2 = NULL;
+	}
+	return replaced_count;
+}
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index 0b7e28e7eaa4..94e7855ae71b 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -11,6 +11,8 @@
  */
 #include <linux/rbtree.h>
 #include <linux/list_sort.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include "ext4.h"
 #include "extents_status.h"
 
@@ -313,19 +315,27 @@ ext4_es_alloc_extent(struct inode *inode, ext4_lblk_t lblk, ext4_lblk_t len,
 	 */
 	if (!ext4_es_is_delayed(es)) {
 		EXT4_I(inode)->i_es_lru_nr++;
-		percpu_counter_inc(&EXT4_SB(inode->i_sb)->s_extent_cache_cnt);
+		percpu_counter_inc(&EXT4_SB(inode->i_sb)->
+					s_es_stats.es_stats_lru_cnt);
 	}
 
+	EXT4_I(inode)->i_es_all_nr++;
+	percpu_counter_inc(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt);
+
 	return es;
 }
 
 static void ext4_es_free_extent(struct inode *inode, struct extent_status *es)
 {
+	EXT4_I(inode)->i_es_all_nr--;
+	percpu_counter_dec(&EXT4_SB(inode->i_sb)->s_es_stats.es_stats_all_cnt);
+
 	/* Decrease the lru counter when this es is not delayed */
 	if (!ext4_es_is_delayed(es)) {
 		BUG_ON(EXT4_I(inode)->i_es_lru_nr == 0);
 		EXT4_I(inode)->i_es_lru_nr--;
-		percpu_counter_dec(&EXT4_SB(inode->i_sb)->s_extent_cache_cnt);
+		percpu_counter_dec(&EXT4_SB(inode->i_sb)->
+					s_es_stats.es_stats_lru_cnt);
 	}
 
 	kmem_cache_free(ext4_es_cachep, es);
@@ -426,7 +436,7 @@ static void ext4_es_insert_extent_ext_check(struct inode *inode,
 	unsigned short ee_len;
 	int depth, ee_status, es_status;
 
-	path = ext4_ext_find_extent(inode, es->es_lblk, NULL, EXT4_EX_NOCACHE);
+	path = ext4_find_extent(inode, es->es_lblk, NULL, EXT4_EX_NOCACHE);
 	if (IS_ERR(path))
 		return;
 
@@ -499,10 +509,8 @@ static void ext4_es_insert_extent_ext_check(struct inode *inode,
 		}
 	}
 out:
-	if (path) {
-		ext4_ext_drop_refs(path);
-		kfree(path);
-	}
+	ext4_ext_drop_refs(path);
+	kfree(path);
 }
 
 static void ext4_es_insert_extent_ind_check(struct inode *inode,
@@ -731,6 +739,7 @@ int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
 			  struct extent_status *es)
 {
 	struct ext4_es_tree *tree;
+	struct ext4_es_stats *stats;
 	struct extent_status *es1 = NULL;
 	struct rb_node *node;
 	int found = 0;
@@ -767,11 +776,15 @@ int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk,
 	}
 
 out:
+	stats = &EXT4_SB(inode->i_sb)->s_es_stats;
 	if (found) {
 		BUG_ON(!es1);
 		es->es_lblk = es1->es_lblk;
 		es->es_len = es1->es_len;
 		es->es_pblk = es1->es_pblk;
+		stats->es_stats_cache_hits++;
+	} else {
+		stats->es_stats_cache_misses++;
 	}
 
 	read_unlock(&EXT4_I(inode)->i_es_lock);
@@ -933,11 +946,16 @@ static int __ext4_es_shrink(struct ext4_sb_info *sbi, int nr_to_scan,
 			    struct ext4_inode_info *locked_ei)
 {
 	struct ext4_inode_info *ei;
+	struct ext4_es_stats *es_stats;
 	struct list_head *cur, *tmp;
 	LIST_HEAD(skipped);
+	ktime_t start_time;
+	u64 scan_time;
 	int nr_shrunk = 0;
 	int retried = 0, skip_precached = 1, nr_skipped = 0;
 
+	es_stats = &sbi->s_es_stats;
+	start_time = ktime_get();
 	spin_lock(&sbi->s_es_lru_lock);
 
 retry:
@@ -948,7 +966,8 @@ retry:
 		 * If we have already reclaimed all extents from extent
 		 * status tree, just stop the loop immediately.
 		 */
-		if (percpu_counter_read_positive(&sbi->s_extent_cache_cnt) == 0)
+		if (percpu_counter_read_positive(
+				&es_stats->es_stats_lru_cnt) == 0)
 			break;
 
 		ei = list_entry(cur, struct ext4_inode_info, i_es_lru);
@@ -958,7 +977,7 @@ retry:
 		 * time.  Normally we try hard to avoid shrinking
 		 * precached inodes, but we will as a last resort.
 		 */
-		if ((sbi->s_es_last_sorted < ei->i_touch_when) ||
+		if ((es_stats->es_stats_last_sorted < ei->i_touch_when) ||
 		    (skip_precached && ext4_test_inode_state(&ei->vfs_inode,
 						EXT4_STATE_EXT_PRECACHED))) {
 			nr_skipped++;
@@ -992,7 +1011,7 @@ retry:
 	if ((nr_shrunk == 0) && nr_skipped && !retried) {
 		retried++;
 		list_sort(NULL, &sbi->s_es_lru, ext4_inode_touch_time_cmp);
-		sbi->s_es_last_sorted = jiffies;
+		es_stats->es_stats_last_sorted = jiffies;
 		ei = list_first_entry(&sbi->s_es_lru, struct ext4_inode_info,
 				      i_es_lru);
 		/*
@@ -1010,6 +1029,22 @@ retry:
 	if (locked_ei && nr_shrunk == 0)
 		nr_shrunk = __es_try_to_reclaim_extents(locked_ei, nr_to_scan);
 
+	scan_time = ktime_to_ns(ktime_sub(ktime_get(), start_time));
+	if (likely(es_stats->es_stats_scan_time))
+		es_stats->es_stats_scan_time = (scan_time +
+				es_stats->es_stats_scan_time*3) / 4;
+	else
+		es_stats->es_stats_scan_time = scan_time;
+	if (scan_time > es_stats->es_stats_max_scan_time)
+		es_stats->es_stats_max_scan_time = scan_time;
+	if (likely(es_stats->es_stats_shrunk))
+		es_stats->es_stats_shrunk = (nr_shrunk +
+				es_stats->es_stats_shrunk*3) / 4;
+	else
+		es_stats->es_stats_shrunk = nr_shrunk;
+
+	trace_ext4_es_shrink(sbi->s_sb, nr_shrunk, scan_time, skip_precached,
+			     nr_skipped, retried);
 	return nr_shrunk;
 }
 
@@ -1020,8 +1055,8 @@ static unsigned long ext4_es_count(struct shrinker *shrink,
 	struct ext4_sb_info *sbi;
 
 	sbi = container_of(shrink, struct ext4_sb_info, s_es_shrinker);
-	nr = percpu_counter_read_positive(&sbi->s_extent_cache_cnt);
-	trace_ext4_es_shrink_enter(sbi->s_sb, sc->nr_to_scan, nr);
+	nr = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_lru_cnt);
+	trace_ext4_es_shrink_count(sbi->s_sb, sc->nr_to_scan, nr);
 	return nr;
 }
 
@@ -1033,31 +1068,160 @@ static unsigned long ext4_es_scan(struct shrinker *shrink,
 	int nr_to_scan = sc->nr_to_scan;
 	int ret, nr_shrunk;
 
-	ret = percpu_counter_read_positive(&sbi->s_extent_cache_cnt);
-	trace_ext4_es_shrink_enter(sbi->s_sb, nr_to_scan, ret);
+	ret = percpu_counter_read_positive(&sbi->s_es_stats.es_stats_lru_cnt);
+	trace_ext4_es_shrink_scan_enter(sbi->s_sb, nr_to_scan, ret);
 
 	if (!nr_to_scan)
 		return ret;
 
 	nr_shrunk = __ext4_es_shrink(sbi, nr_to_scan, NULL);
 
-	trace_ext4_es_shrink_exit(sbi->s_sb, nr_shrunk, ret);
+	trace_ext4_es_shrink_scan_exit(sbi->s_sb, nr_shrunk, ret);
 	return nr_shrunk;
 }
 
-void ext4_es_register_shrinker(struct ext4_sb_info *sbi)
+static void *ext4_es_seq_shrinker_info_start(struct seq_file *seq, loff_t *pos)
 {
+	return *pos ? NULL : SEQ_START_TOKEN;
+}
+
+static void *
+ext4_es_seq_shrinker_info_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return NULL;
+}
+
+static int ext4_es_seq_shrinker_info_show(struct seq_file *seq, void *v)
+{
+	struct ext4_sb_info *sbi = seq->private;
+	struct ext4_es_stats *es_stats = &sbi->s_es_stats;
+	struct ext4_inode_info *ei, *max = NULL;
+	unsigned int inode_cnt = 0;
+
+	if (v != SEQ_START_TOKEN)
+		return 0;
+
+	/* here we just find an inode that has the max nr. of objects */
+	spin_lock(&sbi->s_es_lru_lock);
+	list_for_each_entry(ei, &sbi->s_es_lru, i_es_lru) {
+		inode_cnt++;
+		if (max && max->i_es_all_nr < ei->i_es_all_nr)
+			max = ei;
+		else if (!max)
+			max = ei;
+	}
+	spin_unlock(&sbi->s_es_lru_lock);
+
+	seq_printf(seq, "stats:\n  %lld objects\n  %lld reclaimable objects\n",
+		   percpu_counter_sum_positive(&es_stats->es_stats_all_cnt),
+		   percpu_counter_sum_positive(&es_stats->es_stats_lru_cnt));
+	seq_printf(seq, "  %lu/%lu cache hits/misses\n",
+		   es_stats->es_stats_cache_hits,
+		   es_stats->es_stats_cache_misses);
+	if (es_stats->es_stats_last_sorted != 0)
+		seq_printf(seq, "  %u ms last sorted interval\n",
+			   jiffies_to_msecs(jiffies -
+					    es_stats->es_stats_last_sorted));
+	if (inode_cnt)
+		seq_printf(seq, "  %d inodes on lru list\n", inode_cnt);
+
+	seq_printf(seq, "average:\n  %llu us scan time\n",
+	    div_u64(es_stats->es_stats_scan_time, 1000));
+	seq_printf(seq, "  %lu shrunk objects\n", es_stats->es_stats_shrunk);
+	if (inode_cnt)
+		seq_printf(seq,
+		    "maximum:\n  %lu inode (%u objects, %u reclaimable)\n"
+		    "  %llu us max scan time\n",
+		    max->vfs_inode.i_ino, max->i_es_all_nr, max->i_es_lru_nr,
+		    div_u64(es_stats->es_stats_max_scan_time, 1000));
+
+	return 0;
+}
+
+static void ext4_es_seq_shrinker_info_stop(struct seq_file *seq, void *v)
+{
+}
+
+static const struct seq_operations ext4_es_seq_shrinker_info_ops = {
+	.start = ext4_es_seq_shrinker_info_start,
+	.next  = ext4_es_seq_shrinker_info_next,
+	.stop  = ext4_es_seq_shrinker_info_stop,
+	.show  = ext4_es_seq_shrinker_info_show,
+};
+
+static int
+ext4_es_seq_shrinker_info_open(struct inode *inode, struct file *file)
+{
+	int ret;
+
+	ret = seq_open(file, &ext4_es_seq_shrinker_info_ops);
+	if (!ret) {
+		struct seq_file *m = file->private_data;
+		m->private = PDE_DATA(inode);
+	}
+
+	return ret;
+}
+
+static int
+ext4_es_seq_shrinker_info_release(struct inode *inode, struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+static const struct file_operations ext4_es_seq_shrinker_info_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ext4_es_seq_shrinker_info_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= ext4_es_seq_shrinker_info_release,
+};
+
+int ext4_es_register_shrinker(struct ext4_sb_info *sbi)
+{
+	int err;
+
 	INIT_LIST_HEAD(&sbi->s_es_lru);
 	spin_lock_init(&sbi->s_es_lru_lock);
-	sbi->s_es_last_sorted = 0;
+	sbi->s_es_stats.es_stats_last_sorted = 0;
+	sbi->s_es_stats.es_stats_shrunk = 0;
+	sbi->s_es_stats.es_stats_cache_hits = 0;
+	sbi->s_es_stats.es_stats_cache_misses = 0;
+	sbi->s_es_stats.es_stats_scan_time = 0;
+	sbi->s_es_stats.es_stats_max_scan_time = 0;
+	err = percpu_counter_init(&sbi->s_es_stats.es_stats_all_cnt, 0, GFP_KERNEL);
+	if (err)
+		return err;
+	err = percpu_counter_init(&sbi->s_es_stats.es_stats_lru_cnt, 0, GFP_KERNEL);
+	if (err)
+		goto err1;
+
 	sbi->s_es_shrinker.scan_objects = ext4_es_scan;
 	sbi->s_es_shrinker.count_objects = ext4_es_count;
 	sbi->s_es_shrinker.seeks = DEFAULT_SEEKS;
-	register_shrinker(&sbi->s_es_shrinker);
+	err = register_shrinker(&sbi->s_es_shrinker);
+	if (err)
+		goto err2;
+
+	if (sbi->s_proc)
+		proc_create_data("es_shrinker_info", S_IRUGO, sbi->s_proc,
+				 &ext4_es_seq_shrinker_info_fops, sbi);
+
+	return 0;
+
+err2:
+	percpu_counter_destroy(&sbi->s_es_stats.es_stats_lru_cnt);
+err1:
+	percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt);
+	return err;
 }
 
 void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi)
 {
+	if (sbi->s_proc)
+		remove_proc_entry("es_shrinker_info", sbi->s_proc);
+	percpu_counter_destroy(&sbi->s_es_stats.es_stats_all_cnt);
+	percpu_counter_destroy(&sbi->s_es_stats.es_stats_lru_cnt);
 	unregister_shrinker(&sbi->s_es_shrinker);
 }
 
diff --git a/fs/ext4/extents_status.h b/fs/ext4/extents_status.h
index f1b62a419920..efd5f970b501 100644
--- a/fs/ext4/extents_status.h
+++ b/fs/ext4/extents_status.h
@@ -64,6 +64,17 @@ struct ext4_es_tree {
 	struct extent_status *cache_es;	/* recently accessed extent */
 };
 
+struct ext4_es_stats {
+	unsigned long es_stats_last_sorted;
+	unsigned long es_stats_shrunk;
+	unsigned long es_stats_cache_hits;
+	unsigned long es_stats_cache_misses;
+	u64 es_stats_scan_time;
+	u64 es_stats_max_scan_time;
+	struct percpu_counter es_stats_all_cnt;
+	struct percpu_counter es_stats_lru_cnt;
+};
+
 extern int __init ext4_init_es(void);
 extern void ext4_exit_es(void);
 extern void ext4_es_init_tree(struct ext4_es_tree *tree);
@@ -138,7 +149,7 @@ static inline void ext4_es_store_pblock_status(struct extent_status *es,
 		       (pb & ~ES_MASK));
 }
 
-extern void ext4_es_register_shrinker(struct ext4_sb_info *sbi);
+extern int ext4_es_register_shrinker(struct ext4_sb_info *sbi);
 extern void ext4_es_unregister_shrinker(struct ext4_sb_info *sbi);
 extern void ext4_es_lru_add(struct inode *inode);
 extern void ext4_es_lru_del(struct inode *inode);
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index aca7b24a4432..8131be8c0af3 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -137,10 +137,10 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 			iov_iter_truncate(from, sbi->s_bitmap_maxbytes - pos);
 	}
 
+	iocb->private = &overwrite;
 	if (o_direct) {
 		blk_start_plug(&plug);
 
-		iocb->private = &overwrite;
 
 		/* check whether we do a DIO overwrite or not */
 		if (ext4_should_dioread_nolock(inode) && !aio_mutex &&
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 5b87fc36aab8..ac644c31ca67 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -887,6 +887,10 @@ got:
 		struct buffer_head *block_bitmap_bh;
 
 		block_bitmap_bh = ext4_read_block_bitmap(sb, group);
+		if (!block_bitmap_bh) {
+			err = -EIO;
+			goto out;
+		}
 		BUFFER_TRACE(block_bitmap_bh, "get block bitmap access");
 		err = ext4_journal_get_write_access(handle, block_bitmap_bh);
 		if (err) {
@@ -1011,8 +1015,7 @@ got:
 	spin_unlock(&sbi->s_next_gen_lock);
 
 	/* Precompute checksum seed for inode metadata */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+	if (ext4_has_metadata_csum(sb)) {
 		__u32 csum;
 		__le32 inum = cpu_to_le32(inode->i_ino);
 		__le32 gen = cpu_to_le32(inode->i_generation);
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index e75f840000a0..36b369697a13 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -318,34 +318,24 @@ static int ext4_blks_to_allocate(Indirect *branch, int k, unsigned int blks,
  *	ext4_alloc_block() (normally -ENOSPC). Otherwise we set the chain
  *	as described above and return 0.
  */
-static int ext4_alloc_branch(handle_t *handle, struct inode *inode,
-			     ext4_lblk_t iblock, int indirect_blks,
-			     int *blks, ext4_fsblk_t goal,
-			     ext4_lblk_t *offsets, Indirect *branch)
+static int ext4_alloc_branch(handle_t *handle,
+			     struct ext4_allocation_request *ar,
+			     int indirect_blks, ext4_lblk_t *offsets,
+			     Indirect *branch)
 {
-	struct ext4_allocation_request	ar;
 	struct buffer_head *		bh;
 	ext4_fsblk_t			b, new_blocks[4];
 	__le32				*p;
 	int				i, j, err, len = 1;
 
-	/*
-	 * Set up for the direct block allocation
-	 */
-	memset(&ar, 0, sizeof(ar));
-	ar.inode = inode;
-	ar.len = *blks;
-	ar.logical = iblock;
-	if (S_ISREG(inode->i_mode))
-		ar.flags = EXT4_MB_HINT_DATA;
-
 	for (i = 0; i <= indirect_blks; i++) {
 		if (i == indirect_blks) {
-			ar.goal = goal;
-			new_blocks[i] = ext4_mb_new_blocks(handle, &ar, &err);
+			new_blocks[i] = ext4_mb_new_blocks(handle, ar, &err);
 		} else
-			goal = new_blocks[i] = ext4_new_meta_blocks(handle, inode,
-							goal, 0, NULL, &err);
+			ar->goal = new_blocks[i] = ext4_new_meta_blocks(handle,
+					ar->inode, ar->goal,
+					ar->flags & EXT4_MB_DELALLOC_RESERVED,
+					NULL, &err);
 		if (err) {
 			i--;
 			goto failed;
@@ -354,7 +344,7 @@ static int ext4_alloc_branch(handle_t *handle, struct inode *inode,
 		if (i == 0)
 			continue;
 
-		bh = branch[i].bh = sb_getblk(inode->i_sb, new_blocks[i-1]);
+		bh = branch[i].bh = sb_getblk(ar->inode->i_sb, new_blocks[i-1]);
 		if (unlikely(!bh)) {
 			err = -ENOMEM;
 			goto failed;
@@ -372,7 +362,7 @@ static int ext4_alloc_branch(handle_t *handle, struct inode *inode,
 		b = new_blocks[i];
 
 		if (i == indirect_blks)
-			len = ar.len;
+			len = ar->len;
 		for (j = 0; j < len; j++)
 			*p++ = cpu_to_le32(b++);
 
@@ -381,11 +371,10 @@ static int ext4_alloc_branch(handle_t *handle, struct inode *inode,
 		unlock_buffer(bh);
 
 		BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
-		err = ext4_handle_dirty_metadata(handle, inode, bh);
+		err = ext4_handle_dirty_metadata(handle, ar->inode, bh);
 		if (err)
 			goto failed;
 	}
-	*blks = ar.len;
 	return 0;
 failed:
 	for (; i >= 0; i--) {
@@ -396,10 +385,10 @@ failed:
 		 * existing before ext4_alloc_branch() was called.
 		 */
 		if (i > 0 && i != indirect_blks && branch[i].bh)
-			ext4_forget(handle, 1, inode, branch[i].bh,
+			ext4_forget(handle, 1, ar->inode, branch[i].bh,
 				    branch[i].bh->b_blocknr);
-		ext4_free_blocks(handle, inode, NULL, new_blocks[i],
-				 (i == indirect_blks) ? ar.len : 1, 0);
+		ext4_free_blocks(handle, ar->inode, NULL, new_blocks[i],
+				 (i == indirect_blks) ? ar->len : 1, 0);
 	}
 	return err;
 }
@@ -419,9 +408,9 @@ failed:
  * inode (->i_blocks, etc.). In case of success we end up with the full
  * chain to new block and return 0.
  */
-static int ext4_splice_branch(handle_t *handle, struct inode *inode,
-			      ext4_lblk_t block, Indirect *where, int num,
-			      int blks)
+static int ext4_splice_branch(handle_t *handle,
+			      struct ext4_allocation_request *ar,
+			      Indirect *where, int num)
 {
 	int i;
 	int err = 0;
@@ -446,9 +435,9 @@ static int ext4_splice_branch(handle_t *handle, struct inode *inode,
 	 * Update the host buffer_head or inode to point to more just allocated
 	 * direct blocks blocks
 	 */
-	if (num == 0 && blks > 1) {
+	if (num == 0 && ar->len > 1) {
 		current_block = le32_to_cpu(where->key) + 1;
-		for (i = 1; i < blks; i++)
+		for (i = 1; i < ar->len; i++)
 			*(where->p + i) = cpu_to_le32(current_block++);
 	}
 
@@ -465,14 +454,14 @@ static int ext4_splice_branch(handle_t *handle, struct inode *inode,
 		 */
 		jbd_debug(5, "splicing indirect only\n");
 		BUFFER_TRACE(where->bh, "call ext4_handle_dirty_metadata");
-		err = ext4_handle_dirty_metadata(handle, inode, where->bh);
+		err = ext4_handle_dirty_metadata(handle, ar->inode, where->bh);
 		if (err)
 			goto err_out;
 	} else {
 		/*
 		 * OK, we spliced it into the inode itself on a direct block.
 		 */
-		ext4_mark_inode_dirty(handle, inode);
+		ext4_mark_inode_dirty(handle, ar->inode);
 		jbd_debug(5, "splicing direct\n");
 	}
 	return err;
@@ -484,11 +473,11 @@ err_out:
 		 * need to revoke the block, which is why we don't
 		 * need to set EXT4_FREE_BLOCKS_METADATA.
 		 */
-		ext4_free_blocks(handle, inode, where[i].bh, 0, 1,
+		ext4_free_blocks(handle, ar->inode, where[i].bh, 0, 1,
 				 EXT4_FREE_BLOCKS_FORGET);
 	}
-	ext4_free_blocks(handle, inode, NULL, le32_to_cpu(where[num].key),
-			 blks, 0);
+	ext4_free_blocks(handle, ar->inode, NULL, le32_to_cpu(where[num].key),
+			 ar->len, 0);
 
 	return err;
 }
@@ -525,11 +514,11 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
 			struct ext4_map_blocks *map,
 			int flags)
 {
+	struct ext4_allocation_request ar;
 	int err = -EIO;
 	ext4_lblk_t offsets[4];
 	Indirect chain[4];
 	Indirect *partial;
-	ext4_fsblk_t goal;
 	int indirect_blks;
 	int blocks_to_boundary = 0;
 	int depth;
@@ -579,7 +568,16 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
 		return -ENOSPC;
 	}
 
-	goal = ext4_find_goal(inode, map->m_lblk, partial);
+	/* Set up for the direct block allocation */
+	memset(&ar, 0, sizeof(ar));
+	ar.inode = inode;
+	ar.logical = map->m_lblk;
+	if (S_ISREG(inode->i_mode))
+		ar.flags = EXT4_MB_HINT_DATA;
+	if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+		ar.flags |= EXT4_MB_DELALLOC_RESERVED;
+
+	ar.goal = ext4_find_goal(inode, map->m_lblk, partial);
 
 	/* the number of blocks need to allocate for [d,t]indirect blocks */
 	indirect_blks = (chain + depth) - partial - 1;
@@ -588,13 +586,13 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
 	 * Next look up the indirect map to count the totoal number of
 	 * direct blocks to allocate for this branch.
 	 */
-	count = ext4_blks_to_allocate(partial, indirect_blks,
-				      map->m_len, blocks_to_boundary);
+	ar.len = ext4_blks_to_allocate(partial, indirect_blks,
+				       map->m_len, blocks_to_boundary);
+
 	/*
 	 * Block out ext4_truncate while we alter the tree
 	 */
-	err = ext4_alloc_branch(handle, inode, map->m_lblk, indirect_blks,
-				&count, goal,
+	err = ext4_alloc_branch(handle, &ar, indirect_blks,
 				offsets + (partial - chain), partial);
 
 	/*
@@ -605,14 +603,14 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
 	 * may need to return -EAGAIN upwards in the worst case.  --sct
 	 */
 	if (!err)
-		err = ext4_splice_branch(handle, inode, map->m_lblk,
-					 partial, indirect_blks, count);
+		err = ext4_splice_branch(handle, &ar, partial, indirect_blks);
 	if (err)
 		goto cleanup;
 
 	map->m_flags |= EXT4_MAP_NEW;
 
 	ext4_update_inode_fsync_trans(handle, inode, 1);
+	count = ar.len;
 got_it:
 	map->m_flags |= EXT4_MAP_MAPPED;
 	map->m_pblk = le32_to_cpu(chain[depth-1].key);
diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index bea662bd0ca6..3ea62695abce 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -594,6 +594,7 @@ retry:
 	if (ret) {
 		unlock_page(page);
 		page_cache_release(page);
+		page = NULL;
 		ext4_orphan_add(handle, inode);
 		up_write(&EXT4_I(inode)->xattr_sem);
 		sem_held = 0;
@@ -613,7 +614,8 @@ retry:
 	if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
 		goto retry;
 
-	block_commit_write(page, from, to);
+	if (page)
+		block_commit_write(page, from, to);
 out:
 	if (page) {
 		unlock_page(page);
@@ -1126,8 +1128,7 @@ static int ext4_finish_convert_inline_dir(handle_t *handle,
 	memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
 		inline_size - EXT4_INLINE_DOTDOT_SIZE);
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(inode->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	inode->i_size = inode->i_sb->s_blocksize;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 3aa26e9117c4..3356ab5395f4 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -83,8 +83,7 @@ static int ext4_inode_csum_verify(struct inode *inode, struct ext4_inode *raw,
 
 	if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
 	    cpu_to_le32(EXT4_OS_LINUX) ||
-	    !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	    !ext4_has_metadata_csum(inode->i_sb))
 		return 1;
 
 	provided = le16_to_cpu(raw->i_checksum_lo);
@@ -105,8 +104,7 @@ static void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
 
 	if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
 	    cpu_to_le32(EXT4_OS_LINUX) ||
-	    !EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	    !ext4_has_metadata_csum(inode->i_sb))
 		return;
 
 	csum = ext4_inode_csum(inode, raw, ei);
@@ -224,16 +222,15 @@ void ext4_evict_inode(struct inode *inode)
 		goto no_delete;
 	}
 
-	if (!is_bad_inode(inode))
-		dquot_initialize(inode);
+	if (is_bad_inode(inode))
+		goto no_delete;
+	dquot_initialize(inode);
 
 	if (ext4_should_order_data(inode))
 		ext4_begin_ordered_truncate(inode, 0);
 	truncate_inode_pages_final(&inode->i_data);
 
 	WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
-	if (is_bad_inode(inode))
-		goto no_delete;
 
 	/*
 	 * Protect us against freezing - iput() caller didn't have to have any
@@ -590,20 +587,12 @@ found:
 	/*
 	 * New blocks allocate and/or writing to unwritten extent
 	 * will possibly result in updating i_data, so we take
-	 * the write lock of i_data_sem, and call get_blocks()
+	 * the write lock of i_data_sem, and call get_block()
 	 * with create == 1 flag.
 	 */
 	down_write(&EXT4_I(inode)->i_data_sem);
 
 	/*
-	 * if the caller is from delayed allocation writeout path
-	 * we have already reserved fs blocks for allocation
-	 * let the underlying get_block() function know to
-	 * avoid double accounting
-	 */
-	if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
-		ext4_set_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED);
-	/*
 	 * We need to check for EXT4 here because migrate
 	 * could have changed the inode type in between
 	 */
@@ -631,8 +620,6 @@ found:
 			(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE))
 			ext4_da_update_reserve_space(inode, retval, 1);
 	}
-	if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
-		ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED);
 
 	if (retval > 0) {
 		unsigned int status;
@@ -734,11 +721,11 @@ int ext4_get_block(struct inode *inode, sector_t iblock,
  * `handle' can be NULL if create is zero
  */
 struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
-				ext4_lblk_t block, int create, int *errp)
+				ext4_lblk_t block, int create)
 {
 	struct ext4_map_blocks map;
 	struct buffer_head *bh;
-	int fatal = 0, err;
+	int err;
 
 	J_ASSERT(handle != NULL || create == 0);
 
@@ -747,21 +734,14 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
 	err = ext4_map_blocks(handle, inode, &map,
 			      create ? EXT4_GET_BLOCKS_CREATE : 0);
 
-	/* ensure we send some value back into *errp */
-	*errp = 0;
-
-	if (create && err == 0)
-		err = -ENOSPC;	/* should never happen */
+	if (err == 0)
+		return create ? ERR_PTR(-ENOSPC) : NULL;
 	if (err < 0)
-		*errp = err;
-	if (err <= 0)
-		return NULL;
+		return ERR_PTR(err);
 
 	bh = sb_getblk(inode->i_sb, map.m_pblk);
-	if (unlikely(!bh)) {
-		*errp = -ENOMEM;
-		return NULL;
-	}
+	if (unlikely(!bh))
+		return ERR_PTR(-ENOMEM);
 	if (map.m_flags & EXT4_MAP_NEW) {
 		J_ASSERT(create != 0);
 		J_ASSERT(handle != NULL);
@@ -775,44 +755,44 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
 		 */
 		lock_buffer(bh);
 		BUFFER_TRACE(bh, "call get_create_access");
-		fatal = ext4_journal_get_create_access(handle, bh);
-		if (!fatal && !buffer_uptodate(bh)) {
+		err = ext4_journal_get_create_access(handle, bh);
+		if (unlikely(err)) {
+			unlock_buffer(bh);
+			goto errout;
+		}
+		if (!buffer_uptodate(bh)) {
 			memset(bh->b_data, 0, inode->i_sb->s_blocksize);
 			set_buffer_uptodate(bh);
 		}
 		unlock_buffer(bh);
 		BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
 		err = ext4_handle_dirty_metadata(handle, inode, bh);
-		if (!fatal)
-			fatal = err;
-	} else {
+		if (unlikely(err))
+			goto errout;
+	} else
 		BUFFER_TRACE(bh, "not a new buffer");
-	}
-	if (fatal) {
-		*errp = fatal;
-		brelse(bh);
-		bh = NULL;
-	}
 	return bh;
+errout:
+	brelse(bh);
+	return ERR_PTR(err);
 }
 
 struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
-			       ext4_lblk_t block, int create, int *err)
+			       ext4_lblk_t block, int create)
 {
 	struct buffer_head *bh;
 
-	bh = ext4_getblk(handle, inode, block, create, err);
-	if (!bh)
+	bh = ext4_getblk(handle, inode, block, create);
+	if (IS_ERR(bh))
 		return bh;
-	if (buffer_uptodate(bh))
+	if (!bh || buffer_uptodate(bh))
 		return bh;
 	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh);
 	wait_on_buffer(bh);
 	if (buffer_uptodate(bh))
 		return bh;
 	put_bh(bh);
-	*err = -EIO;
-	return NULL;
+	return ERR_PTR(-EIO);
 }
 
 int ext4_walk_page_buffers(handle_t *handle,
@@ -1536,7 +1516,7 @@ out_unlock:
 }
 
 /*
- * This is a special get_blocks_t callback which is used by
+ * This is a special get_block_t callback which is used by
  * ext4_da_write_begin().  It will either return mapped block or
  * reserve space for a single block.
  *
@@ -2011,12 +1991,10 @@ static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
 	 * in data loss.  So use reserved blocks to allocate metadata if
 	 * possible.
 	 *
-	 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if the blocks
-	 * in question are delalloc blocks.  This affects functions in many
-	 * different parts of the allocation call path.  This flag exists
-	 * primarily because we don't want to change *many* call functions, so
-	 * ext4_map_blocks() will set the EXT4_STATE_DELALLOC_RESERVED flag
-	 * once the inode's allocation semaphore is taken.
+	 * We pass in the magic EXT4_GET_BLOCKS_DELALLOC_RESERVE if
+	 * the blocks in question are delalloc blocks.  This indicates
+	 * that the blocks and quotas has already been checked when
+	 * the data was copied into the page cache.
 	 */
 	get_blocks_flags = EXT4_GET_BLOCKS_CREATE |
 			   EXT4_GET_BLOCKS_METADATA_NOFAIL;
@@ -2515,6 +2493,20 @@ static int ext4_nonda_switch(struct super_block *sb)
 	return 0;
 }
 
+/* We always reserve for an inode update; the superblock could be there too */
+static int ext4_da_write_credits(struct inode *inode, loff_t pos, unsigned len)
+{
+	if (likely(EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
+				EXT4_FEATURE_RO_COMPAT_LARGE_FILE)))
+		return 1;
+
+	if (pos + len <= 0x7fffffffULL)
+		return 1;
+
+	/* We might need to update the superblock to set LARGE_FILE */
+	return 2;
+}
+
 static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
 			       loff_t pos, unsigned len, unsigned flags,
 			       struct page **pagep, void **fsdata)
@@ -2565,7 +2557,8 @@ retry_grab:
 	 * of file which has an already mapped buffer.
 	 */
 retry_journal:
-	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, 1);
+	handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE,
+				ext4_da_write_credits(inode, pos, len));
 	if (IS_ERR(handle)) {
 		page_cache_release(page);
 		return PTR_ERR(handle);
@@ -2658,10 +2651,7 @@ static int ext4_da_write_end(struct file *file,
 	if (copied && new_i_size > EXT4_I(inode)->i_disksize) {
 		if (ext4_has_inline_data(inode) ||
 		    ext4_da_should_update_i_disksize(page, end)) {
-			down_write(&EXT4_I(inode)->i_data_sem);
-			if (new_i_size > EXT4_I(inode)->i_disksize)
-				EXT4_I(inode)->i_disksize = new_i_size;
-			up_write(&EXT4_I(inode)->i_data_sem);
+			ext4_update_i_disksize(inode, new_i_size);
 			/* We need to mark inode dirty even if
 			 * new_i_size is less that inode->i_size
 			 * bu greater than i_disksize.(hint delalloc)
@@ -3936,8 +3926,7 @@ struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
 		ei->i_extra_isize = 0;
 
 	/* Precompute checksum seed for inode metadata */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+	if (ext4_has_metadata_csum(sb)) {
 		struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 		__u32 csum;
 		__le32 inum = cpu_to_le32(inode->i_ino);
@@ -4127,6 +4116,13 @@ bad_inode:
 	return ERR_PTR(ret);
 }
 
+struct inode *ext4_iget_normal(struct super_block *sb, unsigned long ino)
+{
+	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
+		return ERR_PTR(-EIO);
+	return ext4_iget(sb, ino);
+}
+
 static int ext4_inode_blocks_set(handle_t *handle,
 				struct ext4_inode *raw_inode,
 				struct ext4_inode_info *ei)
@@ -4226,7 +4222,8 @@ static int ext4_do_update_inode(handle_t *handle,
 	EXT4_INODE_SET_XTIME(i_atime, inode, raw_inode);
 	EXT4_EINODE_SET_XTIME(i_crtime, ei, raw_inode);
 
-	if (ext4_inode_blocks_set(handle, raw_inode, ei)) {
+	err = ext4_inode_blocks_set(handle, raw_inode, ei);
+	if (err) {
 		spin_unlock(&ei->i_raw_lock);
 		goto out_brelse;
 	}
@@ -4536,8 +4533,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 				ext4_orphan_del(NULL, inode);
 				goto err_out;
 			}
-		} else
+		} else {
+			loff_t oldsize = inode->i_size;
+
 			i_size_write(inode, attr->ia_size);
+			pagecache_isize_extended(inode, oldsize, inode->i_size);
+		}
 
 		/*
 		 * Blocks are going to be removed from the inode. Wait
@@ -4958,7 +4959,12 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
 	if (val)
 		ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA);
 	else {
-		jbd2_journal_flush(journal);
+		err = jbd2_journal_flush(journal);
+		if (err < 0) {
+			jbd2_journal_unlock_updates(journal);
+			ext4_inode_resume_unlocked_dio(inode);
+			return err;
+		}
 		ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA);
 	}
 	ext4_set_aops(inode);
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 0f2252ec274d..bfda18a15592 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -331,8 +331,7 @@ flags_out:
 		if (!inode_owner_or_capable(inode))
 			return -EPERM;
 
-		if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-				EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+		if (ext4_has_metadata_csum(inode->i_sb)) {
 			ext4_warning(sb, "Setting inode version is not "
 				     "supported with metadata_csum enabled.");
 			return -ENOTTY;
@@ -532,9 +531,17 @@ group_add_out:
 	}
 
 	case EXT4_IOC_SWAP_BOOT:
+	{
+		int err;
 		if (!(filp->f_mode & FMODE_WRITE))
 			return -EBADF;
-		return swap_inode_boot_loader(sb, inode);
+		err = mnt_want_write_file(filp);
+		if (err)
+			return err;
+		err = swap_inode_boot_loader(sb, inode);
+		mnt_drop_write_file(filp);
+		return err;
+	}
 
 	case EXT4_IOC_RESIZE_FS: {
 		ext4_fsblk_t n_blocks_count;
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 748c9136a60a..dbfe15c2533c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3155,9 +3155,8 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
 			 "start %lu, size %lu, fe_logical %lu",
 			 (unsigned long) start, (unsigned long) size,
 			 (unsigned long) ac->ac_o_ex.fe_logical);
+		BUG();
 	}
-	BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
-			start > ac->ac_o_ex.fe_logical);
 	BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
 
 	/* now prepare goal request */
@@ -4410,14 +4409,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
 	if (IS_NOQUOTA(ar->inode))
 		ar->flags |= EXT4_MB_USE_ROOT_BLOCKS;
 
-	/*
-	 * For delayed allocation, we could skip the ENOSPC and
-	 * EDQUOT check, as blocks and quotas have been already
-	 * reserved when data being copied into pagecache.
-	 */
-	if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED))
-		ar->flags |= EXT4_MB_DELALLOC_RESERVED;
-	else {
+	if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) {
 		/* Without delayed allocation we need to verify
 		 * there is enough free blocks to do block allocation
 		 * and verify allocation doesn't exceed the quota limits.
@@ -4528,8 +4520,7 @@ out:
 	if (inquota && ar->len < inquota)
 		dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len));
 	if (!ar->len) {
-		if (!ext4_test_inode_state(ar->inode,
-					   EXT4_STATE_DELALLOC_RESERVED))
+		if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0)
 			/* release all the reserved blocks if non delalloc */
 			percpu_counter_sub(&sbi->s_dirtyclusters_counter,
 						reserv_clstrs);
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index d3567f27bae7..a432634f2e6a 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -41,8 +41,7 @@ static int finish_range(handle_t *handle, struct inode *inode,
 	ext4_ext_store_pblock(&newext, lb->first_pblock);
 	/* Locking only for convinience since we are operating on temp inode */
 	down_write(&EXT4_I(inode)->i_data_sem);
-	path = ext4_ext_find_extent(inode, lb->first_block, NULL, 0);
-
+	path = ext4_find_extent(inode, lb->first_block, NULL, 0);
 	if (IS_ERR(path)) {
 		retval = PTR_ERR(path);
 		path = NULL;
@@ -81,13 +80,11 @@ static int finish_range(handle_t *handle, struct inode *inode,
 				goto err_out;
 		}
 	}
-	retval = ext4_ext_insert_extent(handle, inode, path, &newext, 0);
+	retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0);
 err_out:
 	up_write((&EXT4_I(inode)->i_data_sem));
-	if (path) {
-		ext4_ext_drop_refs(path);
-		kfree(path);
-	}
+	ext4_ext_drop_refs(path);
+	kfree(path);
 	lb->first_pblock = 0;
 	return retval;
 }
diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index 32bce844c2e1..8313ca3324ec 100644
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -20,8 +20,7 @@ static __le32 ext4_mmp_csum(struct super_block *sb, struct mmp_struct *mmp)
 
 static int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)
 {
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return 1;
 
 	return mmp->mmp_checksum == ext4_mmp_csum(sb, mmp);
@@ -29,8 +28,7 @@ static int ext4_mmp_csum_verify(struct super_block *sb, struct mmp_struct *mmp)
 
 static void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp)
 {
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return;
 
 	mmp->mmp_checksum = ext4_mmp_csum(sb, mmp);
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 671a74b14fd7..9f2311bc9c4f 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -27,120 +27,26 @@
  * @lblock:	logical block number to find an extent path
  * @path:	pointer to an extent path pointer (for output)
  *
- * ext4_ext_find_extent wrapper. Return 0 on success, or a negative error value
+ * ext4_find_extent wrapper. Return 0 on success, or a negative error value
  * on failure.
  */
 static inline int
 get_ext_path(struct inode *inode, ext4_lblk_t lblock,
-		struct ext4_ext_path **orig_path)
+		struct ext4_ext_path **ppath)
 {
-	int ret = 0;
 	struct ext4_ext_path *path;
 
-	path = ext4_ext_find_extent(inode, lblock, *orig_path, EXT4_EX_NOCACHE);
+	path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE);
 	if (IS_ERR(path))
-		ret = PTR_ERR(path);
-	else if (path[ext_depth(inode)].p_ext == NULL)
-		ret = -ENODATA;
-	else
-		*orig_path = path;
-
-	return ret;
-}
-
-/**
- * copy_extent_status - Copy the extent's initialization status
- *
- * @src:	an extent for getting initialize status
- * @dest:	an extent to be set the status
- */
-static void
-copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest)
-{
-	if (ext4_ext_is_unwritten(src))
-		ext4_ext_mark_unwritten(dest);
-	else
-		dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest));
-}
-
-/**
- * mext_next_extent - Search for the next extent and set it to "extent"
- *
- * @inode:	inode which is searched
- * @path:	this will obtain data for the next extent
- * @extent:	pointer to the next extent we have just gotten
- *
- * Search the next extent in the array of ext4_ext_path structure (@path)
- * and set it to ext4_extent structure (@extent). In addition, the member of
- * @path (->p_ext) also points the next extent. Return 0 on success, 1 if
- * ext4_ext_path structure refers to the last extent, or a negative error
- * value on failure.
- */
-int
-mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
-		      struct ext4_extent **extent)
-{
-	struct ext4_extent_header *eh;
-	int ppos, leaf_ppos = path->p_depth;
-
-	ppos = leaf_ppos;
-	if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) {
-		/* leaf block */
-		*extent = ++path[ppos].p_ext;
-		path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
-		return 0;
-	}
-
-	while (--ppos >= 0) {
-		if (EXT_LAST_INDEX(path[ppos].p_hdr) >
-		    path[ppos].p_idx) {
-			int cur_ppos = ppos;
-
-			/* index block */
-			path[ppos].p_idx++;
-			path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
-			if (path[ppos+1].p_bh)
-				brelse(path[ppos+1].p_bh);
-			path[ppos+1].p_bh =
-				sb_bread(inode->i_sb, path[ppos].p_block);
-			if (!path[ppos+1].p_bh)
-				return -EIO;
-			path[ppos+1].p_hdr =
-				ext_block_hdr(path[ppos+1].p_bh);
-
-			/* Halfway index block */
-			while (++cur_ppos < leaf_ppos) {
-				path[cur_ppos].p_idx =
-					EXT_FIRST_INDEX(path[cur_ppos].p_hdr);
-				path[cur_ppos].p_block =
-					ext4_idx_pblock(path[cur_ppos].p_idx);
-				if (path[cur_ppos+1].p_bh)
-					brelse(path[cur_ppos+1].p_bh);
-				path[cur_ppos+1].p_bh = sb_bread(inode->i_sb,
-					path[cur_ppos].p_block);
-				if (!path[cur_ppos+1].p_bh)
-					return -EIO;
-				path[cur_ppos+1].p_hdr =
-					ext_block_hdr(path[cur_ppos+1].p_bh);
-			}
-
-			path[leaf_ppos].p_ext = *extent = NULL;
-
-			eh = path[leaf_ppos].p_hdr;
-			if (le16_to_cpu(eh->eh_entries) == 0)
-				/* empty leaf is found */
-				return -ENODATA;
-
-			/* leaf block */
-			path[leaf_ppos].p_ext = *extent =
-				EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr);
-			path[leaf_ppos].p_block =
-					ext4_ext_pblock(path[leaf_ppos].p_ext);
-			return 0;
-		}
+		return PTR_ERR(path);
+	if (path[ext_depth(inode)].p_ext == NULL) {
+		ext4_ext_drop_refs(path);
+		kfree(path);
+		*ppath = NULL;
+		return -ENODATA;
 	}
-	/* We found the last extent */
-	return 1;
+	*ppath = path;
+	return 0;
 }
 
 /**
@@ -178,417 +84,6 @@ ext4_double_up_write_data_sem(struct inode *orig_inode,
 }
 
 /**
- * mext_insert_across_blocks - Insert extents across leaf block
- *
- * @handle:		journal handle
- * @orig_inode:		original inode
- * @o_start:		first original extent to be changed
- * @o_end:		last original extent to be changed
- * @start_ext:		first new extent to be inserted
- * @new_ext:		middle of new extent to be inserted
- * @end_ext:		last new extent to be inserted
- *
- * Allocate a new leaf block and insert extents into it. Return 0 on success,
- * or a negative error value on failure.
- */
-static int
-mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
-		struct ext4_extent *o_start, struct ext4_extent *o_end,
-		struct ext4_extent *start_ext, struct ext4_extent *new_ext,
-		struct ext4_extent *end_ext)
-{
-	struct ext4_ext_path *orig_path = NULL;
-	ext4_lblk_t eblock = 0;
-	int new_flag = 0;
-	int end_flag = 0;
-	int err = 0;
-
-	if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) {
-		if (o_start == o_end) {
-
-			/*       start_ext   new_ext    end_ext
-			 * donor |---------|-----------|--------|
-			 * orig  |------------------------------|
-			 */
-			end_flag = 1;
-		} else {
-
-			/*       start_ext   new_ext   end_ext
-			 * donor |---------|----------|---------|
-			 * orig  |---------------|--------------|
-			 */
-			o_end->ee_block = end_ext->ee_block;
-			o_end->ee_len = end_ext->ee_len;
-			ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext));
-		}
-
-		o_start->ee_len = start_ext->ee_len;
-		eblock = le32_to_cpu(start_ext->ee_block);
-		new_flag = 1;
-
-	} else if (start_ext->ee_len && new_ext->ee_len &&
-		   !end_ext->ee_len && o_start == o_end) {
-
-		/*	 start_ext	new_ext
-		 * donor |--------------|---------------|
-		 * orig  |------------------------------|
-		 */
-		o_start->ee_len = start_ext->ee_len;
-		eblock = le32_to_cpu(start_ext->ee_block);
-		new_flag = 1;
-
-	} else if (!start_ext->ee_len && new_ext->ee_len &&
-		   end_ext->ee_len && o_start == o_end) {
-
-		/*	  new_ext	end_ext
-		 * donor |--------------|---------------|
-		 * orig  |------------------------------|
-		 */
-		o_end->ee_block = end_ext->ee_block;
-		o_end->ee_len = end_ext->ee_len;
-		ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext));
-
-		/*
-		 * Set 0 to the extent block if new_ext was
-		 * the first block.
-		 */
-		if (new_ext->ee_block)
-			eblock = le32_to_cpu(new_ext->ee_block);
-
-		new_flag = 1;
-	} else {
-		ext4_debug("ext4 move extent: Unexpected insert case\n");
-		return -EIO;
-	}
-
-	if (new_flag) {
-		err = get_ext_path(orig_inode, eblock, &orig_path);
-		if (err)
-			goto out;
-
-		if (ext4_ext_insert_extent(handle, orig_inode,
-					orig_path, new_ext, 0))
-			goto out;
-	}
-
-	if (end_flag) {
-		err = get_ext_path(orig_inode,
-				le32_to_cpu(end_ext->ee_block) - 1, &orig_path);
-		if (err)
-			goto out;
-
-		if (ext4_ext_insert_extent(handle, orig_inode,
-					   orig_path, end_ext, 0))
-			goto out;
-	}
-out:
-	if (orig_path) {
-		ext4_ext_drop_refs(orig_path);
-		kfree(orig_path);
-	}
-
-	return err;
-
-}
-
-/**
- * mext_insert_inside_block - Insert new extent to the extent block
- *
- * @o_start:		first original extent to be moved
- * @o_end:		last original extent to be moved
- * @start_ext:		first new extent to be inserted
- * @new_ext:		middle of new extent to be inserted
- * @end_ext:		last new extent to be inserted
- * @eh:			extent header of target leaf block
- * @range_to_move:	used to decide how to insert extent
- *
- * Insert extents into the leaf block. The extent (@o_start) is overwritten
- * by inserted extents.
- */
-static void
-mext_insert_inside_block(struct ext4_extent *o_start,
-			      struct ext4_extent *o_end,
-			      struct ext4_extent *start_ext,
-			      struct ext4_extent *new_ext,
-			      struct ext4_extent *end_ext,
-			      struct ext4_extent_header *eh,
-			      int range_to_move)
-{
-	int i = 0;
-	unsigned long len;
-
-	/* Move the existing extents */
-	if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) {
-		len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) -
-			(unsigned long)(o_end + 1);
-		memmove(o_end + 1 + range_to_move, o_end + 1, len);
-	}
-
-	/* Insert start entry */
-	if (start_ext->ee_len)
-		o_start[i++].ee_len = start_ext->ee_len;
-
-	/* Insert new entry */
-	if (new_ext->ee_len) {
-		o_start[i] = *new_ext;
-		ext4_ext_store_pblock(&o_start[i++], ext4_ext_pblock(new_ext));
-	}
-
-	/* Insert end entry */
-	if (end_ext->ee_len)
-		o_start[i] = *end_ext;
-
-	/* Increment the total entries counter on the extent block */
-	le16_add_cpu(&eh->eh_entries, range_to_move);
-}
-
-/**
- * mext_insert_extents - Insert new extent
- *
- * @handle:	journal handle
- * @orig_inode:	original inode
- * @orig_path:	path indicates first extent to be changed
- * @o_start:	first original extent to be changed
- * @o_end:	last original extent to be changed
- * @start_ext:	first new extent to be inserted
- * @new_ext:	middle of new extent to be inserted
- * @end_ext:	last new extent to be inserted
- *
- * Call the function to insert extents. If we cannot add more extents into
- * the leaf block, we call mext_insert_across_blocks() to create a
- * new leaf block. Otherwise call mext_insert_inside_block(). Return 0
- * on success, or a negative error value on failure.
- */
-static int
-mext_insert_extents(handle_t *handle, struct inode *orig_inode,
-			 struct ext4_ext_path *orig_path,
-			 struct ext4_extent *o_start,
-			 struct ext4_extent *o_end,
-			 struct ext4_extent *start_ext,
-			 struct ext4_extent *new_ext,
-			 struct ext4_extent *end_ext)
-{
-	struct  ext4_extent_header *eh;
-	unsigned long need_slots, slots_range;
-	int	range_to_move, depth, ret;
-
-	/*
-	 * The extents need to be inserted
-	 * start_extent + new_extent + end_extent.
-	 */
-	need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) +
-		(new_ext->ee_len ? 1 : 0);
-
-	/* The number of slots between start and end */
-	slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1)
-		/ sizeof(struct ext4_extent);
-
-	/* Range to move the end of extent */
-	range_to_move = need_slots - slots_range;
-	depth = orig_path->p_depth;
-	orig_path += depth;
-	eh = orig_path->p_hdr;
-
-	if (depth) {
-		/* Register to journal */
-		BUFFER_TRACE(orig_path->p_bh, "get_write_access");
-		ret = ext4_journal_get_write_access(handle, orig_path->p_bh);
-		if (ret)
-			return ret;
-	}
-
-	/* Expansion */
-	if (range_to_move > 0 &&
-		(range_to_move > le16_to_cpu(eh->eh_max)
-			- le16_to_cpu(eh->eh_entries))) {
-
-		ret = mext_insert_across_blocks(handle, orig_inode, o_start,
-					o_end, start_ext, new_ext, end_ext);
-		if (ret < 0)
-			return ret;
-	} else
-		mext_insert_inside_block(o_start, o_end, start_ext, new_ext,
-						end_ext, eh, range_to_move);
-
-	return ext4_ext_dirty(handle, orig_inode, orig_path);
-}
-
-/**
- * mext_leaf_block - Move one leaf extent block into the inode.
- *
- * @handle:		journal handle
- * @orig_inode:		original inode
- * @orig_path:		path indicates first extent to be changed
- * @dext:		donor extent
- * @from:		start offset on the target file
- *
- * In order to insert extents into the leaf block, we must divide the extent
- * in the leaf block into three extents. The one is located to be inserted
- * extents, and the others are located around it.
- *
- * Therefore, this function creates structures to save extents of the leaf
- * block, and inserts extents by calling mext_insert_extents() with
- * created extents. Return 0 on success, or a negative error value on failure.
- */
-static int
-mext_leaf_block(handle_t *handle, struct inode *orig_inode,
-		     struct ext4_ext_path *orig_path, struct ext4_extent *dext,
-		     ext4_lblk_t *from)
-{
-	struct ext4_extent *oext, *o_start, *o_end, *prev_ext;
-	struct ext4_extent new_ext, start_ext, end_ext;
-	ext4_lblk_t new_ext_end;
-	int oext_alen, new_ext_alen, end_ext_alen;
-	int depth = ext_depth(orig_inode);
-	int ret;
-
-	start_ext.ee_block = end_ext.ee_block = 0;
-	o_start = o_end = oext = orig_path[depth].p_ext;
-	oext_alen = ext4_ext_get_actual_len(oext);
-	start_ext.ee_len = end_ext.ee_len = 0;
-
-	new_ext.ee_block = cpu_to_le32(*from);
-	ext4_ext_store_pblock(&new_ext, ext4_ext_pblock(dext));
-	new_ext.ee_len = dext->ee_len;
-	new_ext_alen = ext4_ext_get_actual_len(&new_ext);
-	new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1;
-
-	/*
-	 * Case: original extent is first
-	 * oext      |--------|
-	 * new_ext      |--|
-	 * start_ext |--|
-	 */
-	if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) &&
-		le32_to_cpu(new_ext.ee_block) <
-		le32_to_cpu(oext->ee_block) + oext_alen) {
-		start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) -
-					       le32_to_cpu(oext->ee_block));
-		start_ext.ee_block = oext->ee_block;
-		copy_extent_status(oext, &start_ext);
-	} else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) {
-		prev_ext = oext - 1;
-		/*
-		 * We can merge new_ext into previous extent,
-		 * if these are contiguous and same extent type.
-		 */
-		if (ext4_can_extents_be_merged(orig_inode, prev_ext,
-					       &new_ext)) {
-			o_start = prev_ext;
-			start_ext.ee_len = cpu_to_le16(
-				ext4_ext_get_actual_len(prev_ext) +
-				new_ext_alen);
-			start_ext.ee_block = oext->ee_block;
-			copy_extent_status(prev_ext, &start_ext);
-			new_ext.ee_len = 0;
-		}
-	}
-
-	/*
-	 * Case: new_ext_end must be less than oext
-	 * oext      |-----------|
-	 * new_ext       |-------|
-	 */
-	if (le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end) {
-		EXT4_ERROR_INODE(orig_inode,
-			"new_ext_end(%u) should be less than or equal to "
-			"oext->ee_block(%u) + oext_alen(%d) - 1",
-			new_ext_end, le32_to_cpu(oext->ee_block),
-			oext_alen);
-		ret = -EIO;
-		goto out;
-	}
-
-	/*
-	 * Case: new_ext is smaller than original extent
-	 * oext    |---------------|
-	 * new_ext |-----------|
-	 * end_ext             |---|
-	 */
-	if (le32_to_cpu(oext->ee_block) <= new_ext_end &&
-		new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) {
-		end_ext.ee_len =
-			cpu_to_le16(le32_to_cpu(oext->ee_block) +
-			oext_alen - 1 - new_ext_end);
-		copy_extent_status(oext, &end_ext);
-		end_ext_alen = ext4_ext_get_actual_len(&end_ext);
-		ext4_ext_store_pblock(&end_ext,
-			(ext4_ext_pblock(o_end) + oext_alen - end_ext_alen));
-		end_ext.ee_block =
-			cpu_to_le32(le32_to_cpu(o_end->ee_block) +
-			oext_alen - end_ext_alen);
-	}
-
-	ret = mext_insert_extents(handle, orig_inode, orig_path, o_start,
-				o_end, &start_ext, &new_ext, &end_ext);
-out:
-	return ret;
-}
-
-/**
- * mext_calc_swap_extents - Calculate extents for extent swapping.
- *
- * @tmp_dext:		the extent that will belong to the original inode
- * @tmp_oext:		the extent that will belong to the donor inode
- * @orig_off:		block offset of original inode
- * @donor_off:		block offset of donor inode
- * @max_count:		the maximum length of extents
- *
- * Return 0 on success, or a negative error value on failure.
- */
-static int
-mext_calc_swap_extents(struct ext4_extent *tmp_dext,
-			      struct ext4_extent *tmp_oext,
-			      ext4_lblk_t orig_off, ext4_lblk_t donor_off,
-			      ext4_lblk_t max_count)
-{
-	ext4_lblk_t diff, orig_diff;
-	struct ext4_extent dext_old, oext_old;
-
-	BUG_ON(orig_off != donor_off);
-
-	/* original and donor extents have to cover the same block offset */
-	if (orig_off < le32_to_cpu(tmp_oext->ee_block) ||
-	    le32_to_cpu(tmp_oext->ee_block) +
-			ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off)
-		return -ENODATA;
-
-	if (orig_off < le32_to_cpu(tmp_dext->ee_block) ||
-	    le32_to_cpu(tmp_dext->ee_block) +
-			ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off)
-		return -ENODATA;
-
-	dext_old = *tmp_dext;
-	oext_old = *tmp_oext;
-
-	/* When tmp_dext is too large, pick up the target range. */
-	diff = donor_off - le32_to_cpu(tmp_dext->ee_block);
-
-	ext4_ext_store_pblock(tmp_dext, ext4_ext_pblock(tmp_dext) + diff);
-	le32_add_cpu(&tmp_dext->ee_block, diff);
-	le16_add_cpu(&tmp_dext->ee_len, -diff);
-
-	if (max_count < ext4_ext_get_actual_len(tmp_dext))
-		tmp_dext->ee_len = cpu_to_le16(max_count);
-
-	orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block);
-	ext4_ext_store_pblock(tmp_oext, ext4_ext_pblock(tmp_oext) + orig_diff);
-
-	/* Adjust extent length if donor extent is larger than orig */
-	if (ext4_ext_get_actual_len(tmp_dext) >
-	    ext4_ext_get_actual_len(tmp_oext) - orig_diff)
-		tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) -
-						orig_diff);
-
-	tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext));
-
-	copy_extent_status(&oext_old, tmp_dext);
-	copy_extent_status(&dext_old, tmp_oext);
-
-	return 0;
-}
-
-/**
  * mext_check_coverage - Check that all extents in range has the same type
  *
  * @inode:		inode in question
@@ -619,171 +114,25 @@ mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count,
 	}
 	ret = 1;
 out:
-	if (path) {
-		ext4_ext_drop_refs(path);
-		kfree(path);
-	}
+	ext4_ext_drop_refs(path);
+	kfree(path);
 	return ret;
 }
 
 /**
- * mext_replace_branches - Replace original extents with new extents
- *
- * @handle:		journal handle
- * @orig_inode:		original inode
- * @donor_inode:	donor inode
- * @from:		block offset of orig_inode
- * @count:		block count to be replaced
- * @err:		pointer to save return value
- *
- * Replace original inode extents and donor inode extents page by page.
- * We implement this replacement in the following three steps:
- * 1. Save the block information of original and donor inodes into
- *    dummy extents.
- * 2. Change the block information of original inode to point at the
- *    donor inode blocks.
- * 3. Change the block information of donor inode to point at the saved
- *    original inode blocks in the dummy extents.
- *
- * Return replaced block count.
- */
-static int
-mext_replace_branches(handle_t *handle, struct inode *orig_inode,
-			   struct inode *donor_inode, ext4_lblk_t from,
-			   ext4_lblk_t count, int *err)
-{
-	struct ext4_ext_path *orig_path = NULL;
-	struct ext4_ext_path *donor_path = NULL;
-	struct ext4_extent *oext, *dext;
-	struct ext4_extent tmp_dext, tmp_oext;
-	ext4_lblk_t orig_off = from, donor_off = from;
-	int depth;
-	int replaced_count = 0;
-	int dext_alen;
-
-	*err = ext4_es_remove_extent(orig_inode, from, count);
-	if (*err)
-		goto out;
-
-	*err = ext4_es_remove_extent(donor_inode, from, count);
-	if (*err)
-		goto out;
-
-	/* Get the original extent for the block "orig_off" */
-	*err = get_ext_path(orig_inode, orig_off, &orig_path);
-	if (*err)
-		goto out;
-
-	/* Get the donor extent for the head */
-	*err = get_ext_path(donor_inode, donor_off, &donor_path);
-	if (*err)
-		goto out;
-	depth = ext_depth(orig_inode);
-	oext = orig_path[depth].p_ext;
-	tmp_oext = *oext;
-
-	depth = ext_depth(donor_inode);
-	dext = donor_path[depth].p_ext;
-	if (unlikely(!dext))
-		goto missing_donor_extent;
-	tmp_dext = *dext;
-
-	*err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
-				      donor_off, count);
-	if (*err)
-		goto out;
-
-	/* Loop for the donor extents */
-	while (1) {
-		/* The extent for donor must be found. */
-		if (unlikely(!dext)) {
-		missing_donor_extent:
-			EXT4_ERROR_INODE(donor_inode,
-				   "The extent for donor must be found");
-			*err = -EIO;
-			goto out;
-		} else if (donor_off != le32_to_cpu(tmp_dext.ee_block)) {
-			EXT4_ERROR_INODE(donor_inode,
-				"Donor offset(%u) and the first block of donor "
-				"extent(%u) should be equal",
-				donor_off,
-				le32_to_cpu(tmp_dext.ee_block));
-			*err = -EIO;
-			goto out;
-		}
-
-		/* Set donor extent to orig extent */
-		*err = mext_leaf_block(handle, orig_inode,
-					   orig_path, &tmp_dext, &orig_off);
-		if (*err)
-			goto out;
-
-		/* Set orig extent to donor extent */
-		*err = mext_leaf_block(handle, donor_inode,
-					   donor_path, &tmp_oext, &donor_off);
-		if (*err)
-			goto out;
-
-		dext_alen = ext4_ext_get_actual_len(&tmp_dext);
-		replaced_count += dext_alen;
-		donor_off += dext_alen;
-		orig_off += dext_alen;
-
-		BUG_ON(replaced_count > count);
-		/* Already moved the expected blocks */
-		if (replaced_count >= count)
-			break;
-
-		if (orig_path)
-			ext4_ext_drop_refs(orig_path);
-		*err = get_ext_path(orig_inode, orig_off, &orig_path);
-		if (*err)
-			goto out;
-		depth = ext_depth(orig_inode);
-		oext = orig_path[depth].p_ext;
-		tmp_oext = *oext;
-
-		if (donor_path)
-			ext4_ext_drop_refs(donor_path);
-		*err = get_ext_path(donor_inode, donor_off, &donor_path);
-		if (*err)
-			goto out;
-		depth = ext_depth(donor_inode);
-		dext = donor_path[depth].p_ext;
-		tmp_dext = *dext;
-
-		*err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
-					   donor_off, count - replaced_count);
-		if (*err)
-			goto out;
-	}
-
-out:
-	if (orig_path) {
-		ext4_ext_drop_refs(orig_path);
-		kfree(orig_path);
-	}
-	if (donor_path) {
-		ext4_ext_drop_refs(donor_path);
-		kfree(donor_path);
-	}
-
-	return replaced_count;
-}
-
-/**
  * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2
  *
  * @inode1:	the inode structure
  * @inode2:	the inode structure
- * @index:	page index
+ * @index1:	page index
+ * @index2:	page index
  * @page:	result page vector
  *
  * Grab two locked pages for inode's by inode order
  */
 static int
 mext_page_double_lock(struct inode *inode1, struct inode *inode2,
-		      pgoff_t index, struct page *page[2])
+		      pgoff_t index1, pgoff_t index2, struct page *page[2])
 {
 	struct address_space *mapping[2];
 	unsigned fl = AOP_FLAG_NOFS;
@@ -793,15 +142,18 @@ mext_page_double_lock(struct inode *inode1, struct inode *inode2,
 		mapping[0] = inode1->i_mapping;
 		mapping[1] = inode2->i_mapping;
 	} else {
+		pgoff_t tmp = index1;
+		index1 = index2;
+		index2 = tmp;
 		mapping[0] = inode2->i_mapping;
 		mapping[1] = inode1->i_mapping;
 	}
 
-	page[0] = grab_cache_page_write_begin(mapping[0], index, fl);
+	page[0] = grab_cache_page_write_begin(mapping[0], index1, fl);
 	if (!page[0])
 		return -ENOMEM;
 
-	page[1] = grab_cache_page_write_begin(mapping[1], index, fl);
+	page[1] = grab_cache_page_write_begin(mapping[1], index2, fl);
 	if (!page[1]) {
 		unlock_page(page[0]);
 		page_cache_release(page[0]);
@@ -893,25 +245,27 @@ out:
  * @o_filp:			file structure of original file
  * @donor_inode:		donor inode
  * @orig_page_offset:		page index on original file
+ * @donor_page_offset:		page index on donor file
  * @data_offset_in_page:	block index where data swapping starts
  * @block_len_in_page:		the number of blocks to be swapped
  * @unwritten:			orig extent is unwritten or not
  * @err:			pointer to save return value
  *
  * Save the data in original inode blocks and replace original inode extents
- * with donor inode extents by calling mext_replace_branches().
+ * with donor inode extents by calling ext4_swap_extents().
  * Finally, write out the saved data in new original inode blocks. Return
  * replaced block count.
  */
 static int
 move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
-		  pgoff_t orig_page_offset, int data_offset_in_page,
-		  int block_len_in_page, int unwritten, int *err)
+		     pgoff_t orig_page_offset, pgoff_t donor_page_offset,
+		     int data_offset_in_page,
+		     int block_len_in_page, int unwritten, int *err)
 {
 	struct inode *orig_inode = file_inode(o_filp);
 	struct page *pagep[2] = {NULL, NULL};
 	handle_t *handle;
-	ext4_lblk_t orig_blk_offset;
+	ext4_lblk_t orig_blk_offset, donor_blk_offset;
 	unsigned long blocksize = orig_inode->i_sb->s_blocksize;
 	unsigned int w_flags = 0;
 	unsigned int tmp_data_size, data_size, replaced_size;
@@ -939,6 +293,9 @@ again:
 	orig_blk_offset = orig_page_offset * blocks_per_page +
 		data_offset_in_page;
 
+	donor_blk_offset = donor_page_offset * blocks_per_page +
+		data_offset_in_page;
+
 	/* Calculate data_size */
 	if ((orig_blk_offset + block_len_in_page - 1) ==
 	    ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) {
@@ -959,7 +316,7 @@ again:
 	replaced_size = data_size;
 
 	*err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset,
-				     pagep);
+				     donor_page_offset, pagep);
 	if (unlikely(*err < 0))
 		goto stop_journal;
 	/*
@@ -978,7 +335,7 @@ again:
 		if (*err)
 			goto drop_data_sem;
 
-		unwritten &= mext_check_coverage(donor_inode, orig_blk_offset,
+		unwritten &= mext_check_coverage(donor_inode, donor_blk_offset,
 						 block_len_in_page, 1, err);
 		if (*err)
 			goto drop_data_sem;
@@ -994,9 +351,10 @@ again:
 			*err = -EBUSY;
 			goto drop_data_sem;
 		}
-		replaced_count = mext_replace_branches(handle, orig_inode,
-						donor_inode, orig_blk_offset,
-						block_len_in_page, err);
+		replaced_count = ext4_swap_extents(handle, orig_inode,
+						   donor_inode, orig_blk_offset,
+						   donor_blk_offset,
+						   block_len_in_page, 1, err);
 	drop_data_sem:
 		ext4_double_up_write_data_sem(orig_inode, donor_inode);
 		goto unlock_pages;
@@ -1014,9 +372,9 @@ data_copy:
 		goto unlock_pages;
 	}
 	ext4_double_down_write_data_sem(orig_inode, donor_inode);
-	replaced_count = mext_replace_branches(handle, orig_inode, donor_inode,
-					       orig_blk_offset,
-					       block_len_in_page, err);
+	replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode,
+					       orig_blk_offset, donor_blk_offset,
+					   block_len_in_page, 1, err);
 	ext4_double_up_write_data_sem(orig_inode, donor_inode);
 	if (*err) {
 		if (replaced_count) {
@@ -1061,9 +419,9 @@ repair_branches:
 	 * Try to swap extents to it's original places
 	 */
 	ext4_double_down_write_data_sem(orig_inode, donor_inode);
-	replaced_count = mext_replace_branches(handle, donor_inode, orig_inode,
-					       orig_blk_offset,
-					       block_len_in_page, &err2);
+	replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode,
+					       orig_blk_offset, donor_blk_offset,
+					   block_len_in_page, 0, &err2);
 	ext4_double_up_write_data_sem(orig_inode, donor_inode);
 	if (replaced_count != block_len_in_page) {
 		EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset),
@@ -1093,10 +451,14 @@ mext_check_arguments(struct inode *orig_inode,
 		     struct inode *donor_inode, __u64 orig_start,
 		     __u64 donor_start, __u64 *len)
 {
-	ext4_lblk_t orig_blocks, donor_blocks;
+	__u64 orig_eof, donor_eof;
 	unsigned int blkbits = orig_inode->i_blkbits;
 	unsigned int blocksize = 1 << blkbits;
 
+	orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits;
+	donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits;
+
+
 	if (donor_inode->i_mode & (S_ISUID|S_ISGID)) {
 		ext4_debug("ext4 move extent: suid or sgid is set"
 			   " to donor file [ino:orig %lu, donor %lu]\n",
@@ -1112,7 +474,7 @@ mext_check_arguments(struct inode *orig_inode,
 		ext4_debug("ext4 move extent: The argument files should "
 			"not be swapfile [ino:orig %lu, donor %lu]\n",
 			orig_inode->i_ino, donor_inode->i_ino);
-		return -EINVAL;
+		return -EBUSY;
 	}
 
 	/* Ext4 move extent supports only extent based file */
@@ -1132,67 +494,28 @@ mext_check_arguments(struct inode *orig_inode,
 	}
 
 	/* Start offset should be same */
-	if (orig_start != donor_start) {
+	if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) !=
+	    (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) {
 		ext4_debug("ext4 move extent: orig and donor's start "
-			"offset are not same [ino:orig %lu, donor %lu]\n",
+			"offset are not alligned [ino:orig %lu, donor %lu]\n",
 			orig_inode->i_ino, donor_inode->i_ino);
 		return -EINVAL;
 	}
 
 	if ((orig_start >= EXT_MAX_BLOCKS) ||
+	    (donor_start >= EXT_MAX_BLOCKS) ||
 	    (*len > EXT_MAX_BLOCKS) ||
+	    (donor_start + *len >= EXT_MAX_BLOCKS) ||
 	    (orig_start + *len >= EXT_MAX_BLOCKS))  {
 		ext4_debug("ext4 move extent: Can't handle over [%u] blocks "
 			"[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS,
 			orig_inode->i_ino, donor_inode->i_ino);
 		return -EINVAL;
 	}
-
-	if (orig_inode->i_size > donor_inode->i_size) {
-		donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits;
-		/* TODO: eliminate this artificial restriction */
-		if (orig_start >= donor_blocks) {
-			ext4_debug("ext4 move extent: orig start offset "
-			"[%llu] should be less than donor file blocks "
-			"[%u] [ino:orig %lu, donor %lu]\n",
-			orig_start, donor_blocks,
-			orig_inode->i_ino, donor_inode->i_ino);
-			return -EINVAL;
-		}
-
-		/* TODO: eliminate this artificial restriction */
-		if (orig_start + *len > donor_blocks) {
-			ext4_debug("ext4 move extent: End offset [%llu] should "
-				"be less than donor file blocks [%u]."
-				"So adjust length from %llu to %llu "
-				"[ino:orig %lu, donor %lu]\n",
-				orig_start + *len, donor_blocks,
-				*len, donor_blocks - orig_start,
-				orig_inode->i_ino, donor_inode->i_ino);
-			*len = donor_blocks - orig_start;
-		}
-	} else {
-		orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits;
-		if (orig_start >= orig_blocks) {
-			ext4_debug("ext4 move extent: start offset [%llu] "
-				"should be less than original file blocks "
-				"[%u] [ino:orig %lu, donor %lu]\n",
-				 orig_start, orig_blocks,
-				orig_inode->i_ino, donor_inode->i_ino);
-			return -EINVAL;
-		}
-
-		if (orig_start + *len > orig_blocks) {
-			ext4_debug("ext4 move extent: Adjust length "
-				"from %llu to %llu. Because it should be "
-				"less than original file blocks "
-				"[ino:orig %lu, donor %lu]\n",
-				*len, orig_blocks - orig_start,
-				orig_inode->i_ino, donor_inode->i_ino);
-			*len = orig_blocks - orig_start;
-		}
-	}
-
+	if (orig_eof < orig_start + *len - 1)
+		*len = orig_eof - orig_start;
+	if (donor_eof < donor_start + *len - 1)
+		*len = donor_eof - donor_start;
 	if (!*len) {
 		ext4_debug("ext4 move extent: len should not be 0 "
 			"[ino:orig %lu, donor %lu]\n", orig_inode->i_ino,
@@ -1208,60 +531,26 @@ mext_check_arguments(struct inode *orig_inode,
  *
  * @o_filp:		file structure of the original file
  * @d_filp:		file structure of the donor file
- * @orig_start:		start offset in block for orig
- * @donor_start:	start offset in block for donor
+ * @orig_blk:		start offset in block for orig
+ * @donor_blk:		start offset in block for donor
  * @len:		the number of blocks to be moved
  * @moved_len:		moved block length
  *
  * This function returns 0 and moved block length is set in moved_len
  * if succeed, otherwise returns error value.
  *
- * Note: ext4_move_extents() proceeds the following order.
- * 1:ext4_move_extents() calculates the last block number of moving extent
- *   function by the start block number (orig_start) and the number of blocks
- *   to be moved (len) specified as arguments.
- *   If the {orig, donor}_start points a hole, the extent's start offset
- *   pointed by ext_cur (current extent), holecheck_path, orig_path are set
- *   after hole behind.
- * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent
- *   or the ext_cur exceeds the block_end which is last logical block number.
- * 3:To get the length of continues area, call mext_next_extent()
- *   specified with the ext_cur (initial value is holecheck_path) re-cursive,
- *   until find un-continuous extent, the start logical block number exceeds
- *   the block_end or the extent points to the last extent.
- * 4:Exchange the original inode data with donor inode data
- *   from orig_page_offset to seq_end_page.
- *   The start indexes of data are specified as arguments.
- *   That of the original inode is orig_page_offset,
- *   and the donor inode is also orig_page_offset
- *   (To easily handle blocksize != pagesize case, the offset for the
- *   donor inode is block unit).
- * 5:Update holecheck_path and orig_path to points a next proceeding extent,
- *   then returns to step 2.
- * 6:Release holecheck_path, orig_path and set the len to moved_len
- *   which shows the number of moved blocks.
- *   The moved_len is useful for the command to calculate the file offset
- *   for starting next move extent ioctl.
- * 7:Return 0 on success, or a negative error value on failure.
  */
 int
-ext4_move_extents(struct file *o_filp, struct file *d_filp,
-		 __u64 orig_start, __u64 donor_start, __u64 len,
-		 __u64 *moved_len)
+ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
+		  __u64 donor_blk, __u64 len, __u64 *moved_len)
 {
 	struct inode *orig_inode = file_inode(o_filp);
 	struct inode *donor_inode = file_inode(d_filp);
-	struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL;
-	struct ext4_extent *ext_prev, *ext_cur, *ext_dummy;
-	ext4_lblk_t block_start = orig_start;
-	ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0;
-	ext4_lblk_t rest_blocks;
-	pgoff_t orig_page_offset = 0, seq_end_page;
-	int ret, depth, last_extent = 0;
+	struct ext4_ext_path *path = NULL;
 	int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits;
-	int data_offset_in_page;
-	int block_len_in_page;
-	int unwritten;
+	ext4_lblk_t o_end, o_start = orig_blk;
+	ext4_lblk_t d_start = donor_blk;
+	int ret;
 
 	if (orig_inode->i_sb != donor_inode->i_sb) {
 		ext4_debug("ext4 move extent: The argument files "
@@ -1303,121 +592,58 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
 	/* Protect extent tree against block allocations via delalloc */
 	ext4_double_down_write_data_sem(orig_inode, donor_inode);
 	/* Check the filesystem environment whether move_extent can be done */
-	ret = mext_check_arguments(orig_inode, donor_inode, orig_start,
-				    donor_start, &len);
+	ret = mext_check_arguments(orig_inode, donor_inode, orig_blk,
+				    donor_blk, &len);
 	if (ret)
 		goto out;
+	o_end = o_start + len;
 
-	file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits;
-	block_end = block_start + len - 1;
-	if (file_end < block_end)
-		len -= block_end - file_end;
+	while (o_start < o_end) {
+		struct ext4_extent *ex;
+		ext4_lblk_t cur_blk, next_blk;
+		pgoff_t orig_page_index, donor_page_index;
+		int offset_in_page;
+		int unwritten, cur_len;
 
-	ret = get_ext_path(orig_inode, block_start, &orig_path);
-	if (ret)
-		goto out;
-
-	/* Get path structure to check the hole */
-	ret = get_ext_path(orig_inode, block_start, &holecheck_path);
-	if (ret)
-		goto out;
-
-	depth = ext_depth(orig_inode);
-	ext_cur = holecheck_path[depth].p_ext;
-
-	/*
-	 * Get proper starting location of block replacement if block_start was
-	 * within the hole.
-	 */
-	if (le32_to_cpu(ext_cur->ee_block) +
-		ext4_ext_get_actual_len(ext_cur) - 1 < block_start) {
-		/*
-		 * The hole exists between extents or the tail of
-		 * original file.
-		 */
-		last_extent = mext_next_extent(orig_inode,
-					holecheck_path, &ext_cur);
-		if (last_extent < 0) {
-			ret = last_extent;
-			goto out;
-		}
-		last_extent = mext_next_extent(orig_inode, orig_path,
-							&ext_dummy);
-		if (last_extent < 0) {
-			ret = last_extent;
+		ret = get_ext_path(orig_inode, o_start, &path);
+		if (ret)
 			goto out;
-		}
-		seq_start = le32_to_cpu(ext_cur->ee_block);
-	} else if (le32_to_cpu(ext_cur->ee_block) > block_start)
-		/* The hole exists at the beginning of original file. */
-		seq_start = le32_to_cpu(ext_cur->ee_block);
-	else
-		seq_start = block_start;
-
-	/* No blocks within the specified range. */
-	if (le32_to_cpu(ext_cur->ee_block) > block_end) {
-		ext4_debug("ext4 move extent: The specified range of file "
-							"may be the hole\n");
-		ret = -EINVAL;
-		goto out;
-	}
-
-	/* Adjust start blocks */
-	add_blocks = min(le32_to_cpu(ext_cur->ee_block) +
-			 ext4_ext_get_actual_len(ext_cur), block_end + 1) -
-		     max(le32_to_cpu(ext_cur->ee_block), block_start);
-
-	while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) {
-		seq_blocks += add_blocks;
-
-		/* Adjust tail blocks */
-		if (seq_start + seq_blocks - 1 > block_end)
-			seq_blocks = block_end - seq_start + 1;
-
-		ext_prev = ext_cur;
-		last_extent = mext_next_extent(orig_inode, holecheck_path,
-						&ext_cur);
-		if (last_extent < 0) {
-			ret = last_extent;
-			break;
-		}
-		add_blocks = ext4_ext_get_actual_len(ext_cur);
-
-		/*
-		 * Extend the length of contiguous block (seq_blocks)
-		 * if extents are contiguous.
-		 */
-		if (ext4_can_extents_be_merged(orig_inode,
-					       ext_prev, ext_cur) &&
-		    block_end >= le32_to_cpu(ext_cur->ee_block) &&
-		    !last_extent)
+		ex = path[path->p_depth].p_ext;
+		next_blk = ext4_ext_next_allocated_block(path);
+		cur_blk = le32_to_cpu(ex->ee_block);
+		cur_len = ext4_ext_get_actual_len(ex);
+		/* Check hole before the start pos */
+		if (cur_blk + cur_len - 1 < o_start) {
+			if (next_blk == EXT_MAX_BLOCKS) {
+				o_start = o_end;
+				ret = -ENODATA;
+				goto out;
+			}
+			d_start += next_blk - o_start;
+			o_start = next_blk;
 			continue;
-
-		/* Is original extent is unwritten */
-		unwritten = ext4_ext_is_unwritten(ext_prev);
-
-		data_offset_in_page = seq_start % blocks_per_page;
-
-		/*
-		 * Calculate data blocks count that should be swapped
-		 * at the first page.
-		 */
-		if (data_offset_in_page + seq_blocks > blocks_per_page) {
-			/* Swapped blocks are across pages */
-			block_len_in_page =
-					blocks_per_page - data_offset_in_page;
-		} else {
-			/* Swapped blocks are in a page */
-			block_len_in_page = seq_blocks;
+		/* Check hole after the start pos */
+		} else if (cur_blk > o_start) {
+			/* Skip hole */
+			d_start += cur_blk - o_start;
+			o_start = cur_blk;
+			/* Extent inside requested range ?*/
+			if (cur_blk >= o_end)
+				goto out;
+		} else { /* in_range(o_start, o_blk, o_len) */
+			cur_len += cur_blk - o_start;
 		}
-
-		orig_page_offset = seq_start >>
-				(PAGE_CACHE_SHIFT - orig_inode->i_blkbits);
-		seq_end_page = (seq_start + seq_blocks - 1) >>
-				(PAGE_CACHE_SHIFT - orig_inode->i_blkbits);
-		seq_start = le32_to_cpu(ext_cur->ee_block);
-		rest_blocks = seq_blocks;
-
+		unwritten = ext4_ext_is_unwritten(ex);
+		if (o_end - o_start < cur_len)
+			cur_len = o_end - o_start;
+
+		orig_page_index = o_start >> (PAGE_CACHE_SHIFT -
+					       orig_inode->i_blkbits);
+		donor_page_index = d_start >> (PAGE_CACHE_SHIFT -
+					       donor_inode->i_blkbits);
+		offset_in_page = o_start % blocks_per_page;
+		if (cur_len > blocks_per_page- offset_in_page)
+			cur_len = blocks_per_page - offset_in_page;
 		/*
 		 * Up semaphore to avoid following problems:
 		 * a. transaction deadlock among ext4_journal_start,
@@ -1426,77 +652,29 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
 		 *    in move_extent_per_page
 		 */
 		ext4_double_up_write_data_sem(orig_inode, donor_inode);
-
-		while (orig_page_offset <= seq_end_page) {
-
-			/* Swap original branches with new branches */
-			block_len_in_page = move_extent_per_page(
-						o_filp, donor_inode,
-						orig_page_offset,
-						data_offset_in_page,
-						block_len_in_page,
-						unwritten, &ret);
-
-			/* Count how many blocks we have exchanged */
-			*moved_len += block_len_in_page;
-			if (ret < 0)
-				break;
-			if (*moved_len > len) {
-				EXT4_ERROR_INODE(orig_inode,
-					"We replaced blocks too much! "
-					"sum of replaced: %llu requested: %llu",
-					*moved_len, len);
-				ret = -EIO;
-				break;
-			}
-
-			orig_page_offset++;
-			data_offset_in_page = 0;
-			rest_blocks -= block_len_in_page;
-			if (rest_blocks > blocks_per_page)
-				block_len_in_page = blocks_per_page;
-			else
-				block_len_in_page = rest_blocks;
-		}
-
+		/* Swap original branches with new branches */
+		move_extent_per_page(o_filp, donor_inode,
+				     orig_page_index, donor_page_index,
+				     offset_in_page, cur_len,
+				     unwritten, &ret);
 		ext4_double_down_write_data_sem(orig_inode, donor_inode);
 		if (ret < 0)
 			break;
-
-		/* Decrease buffer counter */
-		if (holecheck_path)
-			ext4_ext_drop_refs(holecheck_path);
-		ret = get_ext_path(orig_inode, seq_start, &holecheck_path);
-		if (ret)
-			break;
-		depth = holecheck_path->p_depth;
-
-		/* Decrease buffer counter */
-		if (orig_path)
-			ext4_ext_drop_refs(orig_path);
-		ret = get_ext_path(orig_inode, seq_start, &orig_path);
-		if (ret)
-			break;
-
-		ext_cur = holecheck_path[depth].p_ext;
-		add_blocks = ext4_ext_get_actual_len(ext_cur);
-		seq_blocks = 0;
-
+		o_start += cur_len;
+		d_start += cur_len;
 	}
+	*moved_len = o_start - orig_blk;
+	if (*moved_len > len)
+		*moved_len = len;
+
 out:
 	if (*moved_len) {
 		ext4_discard_preallocations(orig_inode);
 		ext4_discard_preallocations(donor_inode);
 	}
 
-	if (orig_path) {
-		ext4_ext_drop_refs(orig_path);
-		kfree(orig_path);
-	}
-	if (holecheck_path) {
-		ext4_ext_drop_refs(holecheck_path);
-		kfree(holecheck_path);
-	}
+	ext4_ext_drop_refs(path);
+	kfree(path);
 	ext4_double_up_write_data_sem(orig_inode, donor_inode);
 	ext4_inode_resume_unlocked_dio(orig_inode);
 	ext4_inode_resume_unlocked_dio(donor_inode);
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 603e4ebbd0ac..426211882f72 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -53,7 +53,7 @@ static struct buffer_head *ext4_append(handle_t *handle,
 					ext4_lblk_t *block)
 {
 	struct buffer_head *bh;
-	int err = 0;
+	int err;
 
 	if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
 		     ((inode->i_size >> 10) >=
@@ -62,9 +62,9 @@ static struct buffer_head *ext4_append(handle_t *handle,
 
 	*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
 
-	bh = ext4_bread(handle, inode, *block, 1, &err);
-	if (!bh)
-		return ERR_PTR(err);
+	bh = ext4_bread(handle, inode, *block, 1);
+	if (IS_ERR(bh))
+		return bh;
 	inode->i_size += inode->i_sb->s_blocksize;
 	EXT4_I(inode)->i_disksize = inode->i_size;
 	BUFFER_TRACE(bh, "get_write_access");
@@ -94,20 +94,20 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
 {
 	struct buffer_head *bh;
 	struct ext4_dir_entry *dirent;
-	int err = 0, is_dx_block = 0;
+	int is_dx_block = 0;
 
-	bh = ext4_bread(NULL, inode, block, 0, &err);
-	if (!bh) {
-		if (err == 0) {
-			ext4_error_inode(inode, __func__, line, block,
-					       "Directory hole found");
-			return ERR_PTR(-EIO);
-		}
+	bh = ext4_bread(NULL, inode, block, 0);
+	if (IS_ERR(bh)) {
 		__ext4_warning(inode->i_sb, __func__, line,
-			       "error reading directory block "
-			       "(ino %lu, block %lu)", inode->i_ino,
+			       "error %ld reading directory block "
+			       "(ino %lu, block %lu)", PTR_ERR(bh), inode->i_ino,
 			       (unsigned long) block);
-		return ERR_PTR(err);
+
+		return bh;
+	}
+	if (!bh) {
+		ext4_error_inode(inode, __func__, line, block, "Directory hole found");
+		return ERR_PTR(-EIO);
 	}
 	dirent = (struct ext4_dir_entry *) bh->b_data;
 	/* Determine whether or not we have an index block */
@@ -124,8 +124,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
 		       "directory leaf block found instead of index block");
 		return ERR_PTR(-EIO);
 	}
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) ||
+	if (!ext4_has_metadata_csum(inode->i_sb) ||
 	    buffer_verified(bh))
 		return bh;
 
@@ -253,8 +252,7 @@ static unsigned dx_node_limit(struct inode *dir);
 static struct dx_frame *dx_probe(const struct qstr *d_name,
 				 struct inode *dir,
 				 struct dx_hash_info *hinfo,
-				 struct dx_frame *frame,
-				 int *err);
+				 struct dx_frame *frame);
 static void dx_release(struct dx_frame *frames);
 static int dx_make_map(struct ext4_dir_entry_2 *de, unsigned blocksize,
 		       struct dx_hash_info *hinfo, struct dx_map_entry map[]);
@@ -270,8 +268,7 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
 				 __u32 *start_hash);
 static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
 		const struct qstr *d_name,
-		struct ext4_dir_entry_2 **res_dir,
-		int *err);
+		struct ext4_dir_entry_2 **res_dir);
 static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
 			     struct inode *inode);
 
@@ -340,8 +337,7 @@ int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent)
 {
 	struct ext4_dir_entry_tail *t;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return 1;
 
 	t = get_dirent_tail(inode, dirent);
@@ -362,8 +358,7 @@ static void ext4_dirent_csum_set(struct inode *inode,
 {
 	struct ext4_dir_entry_tail *t;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return;
 
 	t = get_dirent_tail(inode, dirent);
@@ -438,8 +433,7 @@ static int ext4_dx_csum_verify(struct inode *inode,
 	struct dx_tail *t;
 	int count_offset, limit, count;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return 1;
 
 	c = get_dx_countlimit(inode, dirent, &count_offset);
@@ -468,8 +462,7 @@ static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
 	struct dx_tail *t;
 	int count_offset, limit, count;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return;
 
 	c = get_dx_countlimit(inode, dirent, &count_offset);
@@ -557,8 +550,7 @@ static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
 	unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
 		EXT4_DIR_REC_LEN(2) - infosize;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(dir->i_sb))
 		entry_space -= sizeof(struct dx_tail);
 	return entry_space / sizeof(struct dx_entry);
 }
@@ -567,8 +559,7 @@ static inline unsigned dx_node_limit(struct inode *dir)
 {
 	unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(dir->i_sb))
 		entry_space -= sizeof(struct dx_tail);
 	return entry_space / sizeof(struct dx_entry);
 }
@@ -641,7 +632,9 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
 		u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
 		struct stats stats;
 		printk("%s%3u:%03u hash %8x/%8x ",levels?"":"   ", i, block, hash, range);
-		if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue;
+		bh = ext4_bread(NULL,dir, block, 0);
+		if (!bh || IS_ERR(bh))
+			continue;
 		stats = levels?
 		   dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
 		   dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0);
@@ -669,29 +662,25 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
  */
 static struct dx_frame *
 dx_probe(const struct qstr *d_name, struct inode *dir,
-	 struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
+	 struct dx_hash_info *hinfo, struct dx_frame *frame_in)
 {
 	unsigned count, indirect;
 	struct dx_entry *at, *entries, *p, *q, *m;
 	struct dx_root *root;
-	struct buffer_head *bh;
 	struct dx_frame *frame = frame_in;
+	struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
 	u32 hash;
 
-	frame->bh = NULL;
-	bh = ext4_read_dirblock(dir, 0, INDEX);
-	if (IS_ERR(bh)) {
-		*err = PTR_ERR(bh);
-		goto fail;
-	}
-	root = (struct dx_root *) bh->b_data;
+	frame->bh = ext4_read_dirblock(dir, 0, INDEX);
+	if (IS_ERR(frame->bh))
+		return (struct dx_frame *) frame->bh;
+
+	root = (struct dx_root *) frame->bh->b_data;
 	if (root->info.hash_version != DX_HASH_TEA &&
 	    root->info.hash_version != DX_HASH_HALF_MD4 &&
 	    root->info.hash_version != DX_HASH_LEGACY) {
 		ext4_warning(dir->i_sb, "Unrecognised inode hash code %d",
 			     root->info.hash_version);
-		brelse(bh);
-		*err = ERR_BAD_DX_DIR;
 		goto fail;
 	}
 	hinfo->hash_version = root->info.hash_version;
@@ -705,16 +694,12 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
 	if (root->info.unused_flags & 1) {
 		ext4_warning(dir->i_sb, "Unimplemented inode hash flags: %#06x",
 			     root->info.unused_flags);
-		brelse(bh);
-		*err = ERR_BAD_DX_DIR;
 		goto fail;
 	}
 
 	if ((indirect = root->info.indirect_levels) > 1) {
 		ext4_warning(dir->i_sb, "Unimplemented inode hash depth: %#06x",
 			     root->info.indirect_levels);
-		brelse(bh);
-		*err = ERR_BAD_DX_DIR;
 		goto fail;
 	}
 
@@ -724,27 +709,21 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
 	if (dx_get_limit(entries) != dx_root_limit(dir,
 						   root->info.info_length)) {
 		ext4_warning(dir->i_sb, "dx entry: limit != root limit");
-		brelse(bh);
-		*err = ERR_BAD_DX_DIR;
 		goto fail;
 	}
 
 	dxtrace(printk("Look up %x", hash));
-	while (1)
-	{
+	while (1) {
 		count = dx_get_count(entries);
 		if (!count || count > dx_get_limit(entries)) {
 			ext4_warning(dir->i_sb,
 				     "dx entry: no count or count > limit");
-			brelse(bh);
-			*err = ERR_BAD_DX_DIR;
-			goto fail2;
+			goto fail;
 		}
 
 		p = entries + 1;
 		q = entries + count - 1;
-		while (p <= q)
-		{
+		while (p <= q) {
 			m = p + (q - p)/2;
 			dxtrace(printk("."));
 			if (dx_get_hash(m) > hash)
@@ -753,8 +732,7 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
 				p = m + 1;
 		}
 
-		if (0) // linear search cross check
-		{
+		if (0) { // linear search cross check
 			unsigned n = count - 1;
 			at = entries;
 			while (n--)
@@ -771,38 +749,35 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
 
 		at = p - 1;
 		dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
-		frame->bh = bh;
 		frame->entries = entries;
 		frame->at = at;
-		if (!indirect--) return frame;
-		bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
-		if (IS_ERR(bh)) {
-			*err = PTR_ERR(bh);
-			goto fail2;
+		if (!indirect--)
+			return frame;
+		frame++;
+		frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
+		if (IS_ERR(frame->bh)) {
+			ret_err = (struct dx_frame *) frame->bh;
+			frame->bh = NULL;
+			goto fail;
 		}
-		entries = ((struct dx_node *) bh->b_data)->entries;
+		entries = ((struct dx_node *) frame->bh->b_data)->entries;
 
 		if (dx_get_limit(entries) != dx_node_limit (dir)) {
 			ext4_warning(dir->i_sb,
 				     "dx entry: limit != node limit");
-			brelse(bh);
-			*err = ERR_BAD_DX_DIR;
-			goto fail2;
+			goto fail;
 		}
-		frame++;
-		frame->bh = NULL;
 	}
-fail2:
+fail:
 	while (frame >= frame_in) {
 		brelse(frame->bh);
 		frame--;
 	}
-fail:
-	if (*err == ERR_BAD_DX_DIR)
+	if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
 		ext4_warning(dir->i_sb,
 			     "Corrupt dir inode %lu, running e2fsck is "
 			     "recommended.", dir->i_ino);
-	return NULL;
+	return ret_err;
 }
 
 static void dx_release (struct dx_frame *frames)
@@ -988,9 +963,9 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 	}
 	hinfo.hash = start_hash;
 	hinfo.minor_hash = 0;
-	frame = dx_probe(NULL, dir, &hinfo, frames, &err);
-	if (!frame)
-		return err;
+	frame = dx_probe(NULL, dir, &hinfo, frames);
+	if (IS_ERR(frame))
+		return PTR_ERR(frame);
 
 	/* Add '.' and '..' from the htree header */
 	if (!start_hash && !start_minor_hash) {
@@ -1227,8 +1202,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
 				   buffer */
 	int num = 0;
 	ext4_lblk_t  nblocks;
-	int i, err = 0;
-	int namelen;
+	int i, namelen;
 
 	*res_dir = NULL;
 	sb = dir->i_sb;
@@ -1258,17 +1232,13 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
 		goto restart;
 	}
 	if (is_dx(dir)) {
-		bh = ext4_dx_find_entry(dir, d_name, res_dir, &err);
+		bh = ext4_dx_find_entry(dir, d_name, res_dir);
 		/*
 		 * On success, or if the error was file not found,
 		 * return.  Otherwise, fall back to doing a search the
 		 * old fashioned way.
 		 */
-		if (err == -ENOENT)
-			return NULL;
-		if (err && err != ERR_BAD_DX_DIR)
-			return ERR_PTR(err);
-		if (bh)
+		if (!IS_ERR(bh) || PTR_ERR(bh) != ERR_BAD_DX_DIR)
 			return bh;
 		dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
 			       "falling back\n"));
@@ -1298,10 +1268,10 @@ restart:
 					break;
 				}
 				num++;
-				bh = ext4_getblk(NULL, dir, b++, 0, &err);
-				if (unlikely(err)) {
+				bh = ext4_getblk(NULL, dir, b++, 0);
+				if (unlikely(IS_ERR(bh))) {
 					if (ra_max == 0)
-						return ERR_PTR(err);
+						return bh;
 					break;
 				}
 				bh_use[ra_max] = bh;
@@ -1366,7 +1336,7 @@ cleanup_and_exit:
 }
 
 static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name,
-		       struct ext4_dir_entry_2 **res_dir, int *err)
+		       struct ext4_dir_entry_2 **res_dir)
 {
 	struct super_block * sb = dir->i_sb;
 	struct dx_hash_info	hinfo;
@@ -1375,25 +1345,23 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
 	ext4_lblk_t block;
 	int retval;
 
-	if (!(frame = dx_probe(d_name, dir, &hinfo, frames, err)))
-		return NULL;
+	frame = dx_probe(d_name, dir, &hinfo, frames);
+	if (IS_ERR(frame))
+		return (struct buffer_head *) frame;
 	do {
 		block = dx_get_block(frame->at);
 		bh = ext4_read_dirblock(dir, block, DIRENT);
-		if (IS_ERR(bh)) {
-			*err = PTR_ERR(bh);
+		if (IS_ERR(bh))
 			goto errout;
-		}
+
 		retval = search_dirblock(bh, dir, d_name,
 					 block << EXT4_BLOCK_SIZE_BITS(sb),
 					 res_dir);
-		if (retval == 1) { 	/* Success! */
-			dx_release(frames);
-			return bh;
-		}
+		if (retval == 1)
+			goto success;
 		brelse(bh);
 		if (retval == -1) {
-			*err = ERR_BAD_DX_DIR;
+			bh = ERR_PTR(ERR_BAD_DX_DIR);
 			goto errout;
 		}
 
@@ -1402,18 +1370,19 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
 					       frames, NULL);
 		if (retval < 0) {
 			ext4_warning(sb,
-			     "error reading index page in directory #%lu",
-			     dir->i_ino);
-			*err = retval;
+			     "error %d reading index page in directory #%lu",
+			     retval, dir->i_ino);
+			bh = ERR_PTR(retval);
 			goto errout;
 		}
 	} while (retval == 1);
 
-	*err = -ENOENT;
+	bh = NULL;
 errout:
 	dxtrace(printk(KERN_DEBUG "%s not found\n", d_name->name));
-	dx_release (frames);
-	return NULL;
+success:
+	dx_release(frames);
+	return bh;
 }
 
 static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
@@ -1441,7 +1410,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
 					 dentry);
 			return ERR_PTR(-EIO);
 		}
-		inode = ext4_iget(dir->i_sb, ino);
+		inode = ext4_iget_normal(dir->i_sb, ino);
 		if (inode == ERR_PTR(-ESTALE)) {
 			EXT4_ERROR_INODE(dir,
 					 "deleted inode referenced: %u",
@@ -1474,7 +1443,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
 		return ERR_PTR(-EIO);
 	}
 
-	return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino));
+	return d_obtain_alias(ext4_iget_normal(child->d_inode->i_sb, ino));
 }
 
 /*
@@ -1533,7 +1502,7 @@ static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
  */
 static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 			struct buffer_head **bh,struct dx_frame *frame,
-			struct dx_hash_info *hinfo, int *error)
+			struct dx_hash_info *hinfo)
 {
 	unsigned blocksize = dir->i_sb->s_blocksize;
 	unsigned count, continued;
@@ -1548,16 +1517,14 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	int	csum_size = 0;
 	int	err = 0, i;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(dir->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	bh2 = ext4_append(handle, dir, &newblock);
 	if (IS_ERR(bh2)) {
 		brelse(*bh);
 		*bh = NULL;
-		*error = PTR_ERR(bh2);
-		return NULL;
+		return (struct ext4_dir_entry_2 *) bh2;
 	}
 
 	BUFFER_TRACE(*bh, "get_write_access");
@@ -1617,8 +1584,7 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));
 
 	/* Which block gets the new entry? */
-	if (hinfo->hash >= hash2)
-	{
+	if (hinfo->hash >= hash2) {
 		swap(*bh, bh2);
 		de = de2;
 	}
@@ -1638,8 +1604,7 @@ journal_error:
 	brelse(bh2);
 	*bh = NULL;
 	ext4_std_error(dir->i_sb, err);
-	*error = err;
-	return NULL;
+	return ERR_PTR(err);
 }
 
 int ext4_find_dest_de(struct inode *dir, struct inode *inode,
@@ -1718,8 +1683,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
 	int		csum_size = 0;
 	int		err;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(inode->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	if (!de) {
@@ -1786,8 +1750,7 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
 	struct fake_dirent *fde;
 	int		csum_size = 0;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(inode->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	blocksize =  dir->i_sb->s_blocksize;
@@ -1853,31 +1816,39 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
 		hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
 	hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
 	ext4fs_dirhash(name, namelen, &hinfo);
+	memset(frames, 0, sizeof(frames));
 	frame = frames;
 	frame->entries = entries;
 	frame->at = entries;
 	frame->bh = bh;
 	bh = bh2;
 
-	ext4_handle_dirty_dx_node(handle, dir, frame->bh);
-	ext4_handle_dirty_dirent_node(handle, dir, bh);
+	retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
+	if (retval)
+		goto out_frames;	
+	retval = ext4_handle_dirty_dirent_node(handle, dir, bh);
+	if (retval)
+		goto out_frames;	
 
-	de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
-	if (!de) {
-		/*
-		 * Even if the block split failed, we have to properly write
-		 * out all the changes we did so far. Otherwise we can end up
-		 * with corrupted filesystem.
-		 */
-		ext4_mark_inode_dirty(handle, dir);
-		dx_release(frames);
-		return retval;
+	de = do_split(handle,dir, &bh, frame, &hinfo);
+	if (IS_ERR(de)) {
+		retval = PTR_ERR(de);
+		goto out_frames;
 	}
 	dx_release(frames);
 
 	retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
 	brelse(bh);
 	return retval;
+out_frames:
+	/*
+	 * Even if the block split failed, we have to properly write
+	 * out all the changes we did so far. Otherwise we can end up
+	 * with corrupted filesystem.
+	 */
+	ext4_mark_inode_dirty(handle, dir);
+	dx_release(frames);
+	return retval;
 }
 
 /*
@@ -1904,8 +1875,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
 	ext4_lblk_t block, blocks;
 	int	csum_size = 0;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(inode->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	sb = dir->i_sb;
@@ -1982,9 +1952,9 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
 	struct ext4_dir_entry_2 *de;
 	int err;
 
-	frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err);
-	if (!frame)
-		return err;
+	frame = dx_probe(&dentry->d_name, dir, &hinfo, frames);
+	if (IS_ERR(frame))
+		return PTR_ERR(frame);
 	entries = frame->entries;
 	at = frame->at;
 	bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT);
@@ -2095,9 +2065,11 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
 			goto cleanup;
 		}
 	}
-	de = do_split(handle, dir, &bh, frame, &hinfo, &err);
-	if (!de)
+	de = do_split(handle, dir, &bh, frame, &hinfo);
+	if (IS_ERR(de)) {
+		err = PTR_ERR(de);
 		goto cleanup;
+	}
 	err = add_dirent_to_buf(handle, dentry, inode, de, bh);
 	goto cleanup;
 
@@ -2167,8 +2139,7 @@ static int ext4_delete_entry(handle_t *handle,
 			return err;
 	}
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(dir->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	BUFFER_TRACE(bh, "get_write_access");
@@ -2387,8 +2358,7 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
 	int csum_size = 0;
 	int err;
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(dir->i_sb))
 		csum_size = sizeof(struct ext4_dir_entry_tail);
 
 	if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
@@ -2403,10 +2373,6 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
 	dir_block = ext4_append(handle, inode, &block);
 	if (IS_ERR(dir_block))
 		return PTR_ERR(dir_block);
-	BUFFER_TRACE(dir_block, "get_write_access");
-	err = ext4_journal_get_write_access(handle, dir_block);
-	if (err)
-		goto out;
 	de = (struct ext4_dir_entry_2 *)dir_block->b_data;
 	ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
 	set_nlink(inode, 2);
@@ -2573,7 +2539,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
 	int err = 0, rc;
 	bool dirty = false;
 
-	if (!sbi->s_journal)
+	if (!sbi->s_journal || is_bad_inode(inode))
 		return 0;
 
 	WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
@@ -3190,6 +3156,39 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
 	}
 }
 
+static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
+					      int credits, handle_t **h)
+{
+	struct inode *wh;
+	handle_t *handle;
+	int retries = 0;
+
+	/*
+	 * for inode block, sb block, group summaries,
+	 * and inode bitmap
+	 */
+	credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
+		    EXT4_XATTR_TRANS_BLOCKS + 4);
+retry:
+	wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
+					 &ent->dentry->d_name, 0, NULL,
+					 EXT4_HT_DIR, credits);
+
+	handle = ext4_journal_current_handle();
+	if (IS_ERR(wh)) {
+		if (handle)
+			ext4_journal_stop(handle);
+		if (PTR_ERR(wh) == -ENOSPC &&
+		    ext4_should_retry_alloc(ent->dir->i_sb, &retries))
+			goto retry;
+	} else {
+		*h = handle;
+		init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
+		wh->i_op = &ext4_special_inode_operations;
+	}
+	return wh;
+}
+
 /*
  * Anybody can rename anything with this: the permission checks are left to the
  * higher-level routines.
@@ -3199,7 +3198,8 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
  * This comes from rename(const char *oldpath, const char *newpath)
  */
 static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
-		       struct inode *new_dir, struct dentry *new_dentry)
+		       struct inode *new_dir, struct dentry *new_dentry,
+		       unsigned int flags)
 {
 	handle_t *handle = NULL;
 	struct ext4_renament old = {
@@ -3214,6 +3214,9 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	};
 	int force_reread;
 	int retval;
+	struct inode *whiteout = NULL;
+	int credits;
+	u8 old_file_type;
 
 	dquot_initialize(old.dir);
 	dquot_initialize(new.dir);
@@ -3252,11 +3255,17 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
 		ext4_alloc_da_blocks(old.inode);
 
-	handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
-		(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
-		 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
-	if (IS_ERR(handle))
-		return PTR_ERR(handle);
+	credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
+		   EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
+	if (!(flags & RENAME_WHITEOUT)) {
+		handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
+		if (IS_ERR(handle))
+			return PTR_ERR(handle);
+	} else {
+		whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
+		if (IS_ERR(whiteout))
+			return PTR_ERR(whiteout);
+	}
 
 	if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
 		ext4_handle_sync(handle);
@@ -3284,13 +3293,26 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	 */
 	force_reread = (new.dir->i_ino == old.dir->i_ino &&
 			ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
+
+	old_file_type = old.de->file_type;
+	if (whiteout) {
+		/*
+		 * Do this before adding a new entry, so the old entry is sure
+		 * to be still pointing to the valid old entry.
+		 */
+		retval = ext4_setent(handle, &old, whiteout->i_ino,
+				     EXT4_FT_CHRDEV);
+		if (retval)
+			goto end_rename;
+		ext4_mark_inode_dirty(handle, whiteout);
+	}
 	if (!new.bh) {
 		retval = ext4_add_entry(handle, new.dentry, old.inode);
 		if (retval)
 			goto end_rename;
 	} else {
 		retval = ext4_setent(handle, &new,
-				     old.inode->i_ino, old.de->file_type);
+				     old.inode->i_ino, old_file_type);
 		if (retval)
 			goto end_rename;
 	}
@@ -3305,10 +3327,12 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	old.inode->i_ctime = ext4_current_time(old.inode);
 	ext4_mark_inode_dirty(handle, old.inode);
 
-	/*
-	 * ok, that's it
-	 */
-	ext4_rename_delete(handle, &old, force_reread);
+	if (!whiteout) {
+		/*
+		 * ok, that's it
+		 */
+		ext4_rename_delete(handle, &old, force_reread);
+	}
 
 	if (new.inode) {
 		ext4_dec_count(handle, new.inode);
@@ -3344,6 +3368,12 @@ end_rename:
 	brelse(old.dir_bh);
 	brelse(old.bh);
 	brelse(new.bh);
+	if (whiteout) {
+		if (retval)
+			drop_nlink(whiteout);
+		unlock_new_inode(whiteout);
+		iput(whiteout);
+	}
 	if (handle)
 		ext4_journal_stop(handle);
 	return retval;
@@ -3476,18 +3506,15 @@ static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
 {
-	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 		return -EINVAL;
 
 	if (flags & RENAME_EXCHANGE) {
 		return ext4_cross_rename(old_dir, old_dentry,
 					 new_dir, new_dentry);
 	}
-	/*
-	 * Existence checking was done by the VFS, otherwise "RENAME_NOREPLACE"
-	 * is equivalent to regular rename.
-	 */
-	return ext4_rename(old_dir, old_dentry, new_dir, new_dentry);
+
+	return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
 }
 
 /*
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 1e43b905ff98..ca4588388fc3 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1081,7 +1081,7 @@ static void update_backups(struct super_block *sb, int blk_off, char *data,
 			break;
 
 		if (meta_bg == 0)
-			backup_block = group * bpg + blk_off;
+			backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
 		else
 			backup_block = (ext4_group_first_block_no(sb, group) +
 					ext4_bg_has_super(sb, group));
@@ -1212,8 +1212,7 @@ static int ext4_set_bitmap_checksums(struct super_block *sb,
 {
 	struct buffer_head *bh;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return 0;
 
 	bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 05c159218bc2..2c9e6864abd9 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -70,7 +70,6 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
 static void ext4_clear_journal_err(struct super_block *sb,
 				   struct ext4_super_block *es);
 static int ext4_sync_fs(struct super_block *sb, int wait);
-static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
 static int ext4_remount(struct super_block *sb, int *flags, char *data);
 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int ext4_unfreeze(struct super_block *sb);
@@ -141,8 +140,7 @@ static __le32 ext4_superblock_csum(struct super_block *sb,
 static int ext4_superblock_csum_verify(struct super_block *sb,
 				       struct ext4_super_block *es)
 {
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return 1;
 
 	return es->s_checksum == ext4_superblock_csum(sb, es);
@@ -152,8 +150,7 @@ void ext4_superblock_csum_set(struct super_block *sb)
 {
 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(sb))
 		return;
 
 	es->s_checksum = ext4_superblock_csum(sb, es);
@@ -820,10 +817,9 @@ static void ext4_put_super(struct super_block *sb)
 	percpu_counter_destroy(&sbi->s_freeinodes_counter);
 	percpu_counter_destroy(&sbi->s_dirs_counter);
 	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
-	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
 	brelse(sbi->s_sbh);
 #ifdef CONFIG_QUOTA
-	for (i = 0; i < MAXQUOTAS; i++)
+	for (i = 0; i < EXT4_MAXQUOTAS; i++)
 		kfree(sbi->s_qf_names[i]);
 #endif
 
@@ -885,6 +881,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
 	ext4_es_init_tree(&ei->i_es_tree);
 	rwlock_init(&ei->i_es_lock);
 	INIT_LIST_HEAD(&ei->i_es_lru);
+	ei->i_es_all_nr = 0;
 	ei->i_es_lru_nr = 0;
 	ei->i_touch_when = 0;
 	ei->i_reserved_data_blocks = 0;
@@ -1002,7 +999,7 @@ static struct inode *ext4_nfs_get_inode(struct super_block *sb,
 	 * Currently we don't know the generation for parent directory, so
 	 * a generation of 0 means "accept any"
 	 */
-	inode = ext4_iget(sb, ino);
+	inode = ext4_iget_normal(sb, ino);
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
 	if (generation && inode->i_generation != generation) {
@@ -1124,25 +1121,6 @@ static const struct super_operations ext4_sops = {
 	.bdev_try_to_free_page = bdev_try_to_free_page,
 };
 
-static const struct super_operations ext4_nojournal_sops = {
-	.alloc_inode	= ext4_alloc_inode,
-	.destroy_inode	= ext4_destroy_inode,
-	.write_inode	= ext4_write_inode,
-	.dirty_inode	= ext4_dirty_inode,
-	.drop_inode	= ext4_drop_inode,
-	.evict_inode	= ext4_evict_inode,
-	.sync_fs	= ext4_sync_fs_nojournal,
-	.put_super	= ext4_put_super,
-	.statfs		= ext4_statfs,
-	.remount_fs	= ext4_remount,
-	.show_options	= ext4_show_options,
-#ifdef CONFIG_QUOTA
-	.quota_read	= ext4_quota_read,
-	.quota_write	= ext4_quota_write,
-#endif
-	.bdev_try_to_free_page = bdev_try_to_free_page,
-};
-
 static const struct export_operations ext4_export_ops = {
 	.fh_to_dentry = ext4_fh_to_dentry,
 	.fh_to_parent = ext4_fh_to_parent,
@@ -1712,13 +1690,6 @@ static int parse_options(char *options, struct super_block *sb,
 					"not specified");
 			return 0;
 		}
-	} else {
-		if (sbi->s_jquota_fmt) {
-			ext4_msg(sb, KERN_ERR, "journaled quota format "
-					"specified with no journaling "
-					"enabled");
-			return 0;
-		}
 	}
 #endif
 	if (test_opt(sb, DIOREAD_NOLOCK)) {
@@ -2016,8 +1987,7 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
 	__u16 crc = 0;
 	__le32 le_group = cpu_to_le32(block_group);
 
-	if ((sbi->s_es->s_feature_ro_compat &
-	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
+	if (ext4_has_metadata_csum(sbi->s_sb)) {
 		/* Use new metadata_csum algorithm */
 		__le16 save_csum;
 		__u32 csum32;
@@ -2035,6 +2005,10 @@ static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
 	}
 
 	/* old crc16 code */
+	if (!(sbi->s_es->s_feature_ro_compat &
+	      cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
+		return 0;
+
 	offset = offsetof(struct ext4_group_desc, bg_checksum);
 
 	crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
@@ -2191,7 +2165,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
 	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
 		/* don't clear list on RO mount w/ errors */
 		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
-			jbd_debug(1, "Errors on filesystem, "
+			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
 				  "clearing orphan list.\n");
 			es->s_last_orphan = 0;
 		}
@@ -2207,7 +2181,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
 	/* Needed for iput() to work correctly and not trash data */
 	sb->s_flags |= MS_ACTIVE;
 	/* Turn on quotas so that they are updated correctly */
-	for (i = 0; i < MAXQUOTAS; i++) {
+	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
 		if (EXT4_SB(sb)->s_qf_names[i]) {
 			int ret = ext4_quota_on_mount(sb, i);
 			if (ret < 0)
@@ -2263,7 +2237,7 @@ static void ext4_orphan_cleanup(struct super_block *sb,
 		       PLURAL(nr_truncates));
 #ifdef CONFIG_QUOTA
 	/* Turn quotas off */
-	for (i = 0; i < MAXQUOTAS; i++) {
+	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
 		if (sb_dqopt(sb)->files[i])
 			dquot_quota_off(sb, i);
 	}
@@ -2548,6 +2522,16 @@ static ssize_t sbi_ui_store(struct ext4_attr *a,
 	return count;
 }
 
+static ssize_t es_ui_show(struct ext4_attr *a,
+			   struct ext4_sb_info *sbi, char *buf)
+{
+
+	unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
+			   a->u.offset);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
+}
+
 static ssize_t reserved_clusters_show(struct ext4_attr *a,
 				  struct ext4_sb_info *sbi, char *buf)
 {
@@ -2601,14 +2585,29 @@ static struct ext4_attr ext4_attr_##_name = {			\
 		.offset = offsetof(struct ext4_sb_info, _elname),\
 	},							\
 }
+
+#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname)		\
+static struct ext4_attr ext4_attr_##_name = {				\
+	.attr = {.name = __stringify(_name), .mode = _mode },		\
+	.show	= _show,						\
+	.store	= _store,						\
+	.u = {								\
+		.offset = offsetof(struct ext4_super_block, _elname),	\
+	},								\
+}
+
 #define EXT4_ATTR(name, mode, show, store) \
 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
 
 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
+
+#define EXT4_RO_ATTR_ES_UI(name, elname)	\
+	EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
 #define EXT4_RW_ATTR_SBI_UI(name, elname)	\
 	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
+
 #define ATTR_LIST(name) &ext4_attr_##name.attr
 #define EXT4_DEPRECATED_ATTR(_name, _val)	\
 static struct ext4_attr ext4_attr_##_name = {			\
@@ -2641,6 +2640,9 @@ EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.int
 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
+EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
+EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
+EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
 
 static struct attribute *ext4_attrs[] = {
 	ATTR_LIST(delayed_allocation_blocks),
@@ -2664,6 +2666,9 @@ static struct attribute *ext4_attrs[] = {
 	ATTR_LIST(warning_ratelimit_burst),
 	ATTR_LIST(msg_ratelimit_interval_ms),
 	ATTR_LIST(msg_ratelimit_burst),
+	ATTR_LIST(errors_count),
+	ATTR_LIST(first_error_time),
+	ATTR_LIST(last_error_time),
 	NULL,
 };
 
@@ -2723,9 +2728,25 @@ static void ext4_feat_release(struct kobject *kobj)
 	complete(&ext4_feat->f_kobj_unregister);
 }
 
+static ssize_t ext4_feat_show(struct kobject *kobj,
+			      struct attribute *attr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "supported\n");
+}
+
+/*
+ * We can not use ext4_attr_show/store because it relies on the kobject
+ * being embedded in the ext4_sb_info structure which is definitely not
+ * true in this case.
+ */
+static const struct sysfs_ops ext4_feat_ops = {
+	.show	= ext4_feat_show,
+	.store	= NULL,
+};
+
 static struct kobj_type ext4_feat_ktype = {
 	.default_attrs	= ext4_feat_attrs,
-	.sysfs_ops	= &ext4_attr_ops,
+	.sysfs_ops	= &ext4_feat_ops,
 	.release	= ext4_feat_release,
 };
 
@@ -3179,8 +3200,7 @@ static int set_journal_csum_feature_set(struct super_block *sb)
 	int compat, incompat;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
+	if (ext4_has_metadata_csum(sb)) {
 		/* journal checksum v3 */
 		compat = 0;
 		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
@@ -3190,6 +3210,10 @@ static int set_journal_csum_feature_set(struct super_block *sb)
 		incompat = 0;
 	}
 
+	jbd2_journal_clear_features(sbi->s_journal,
+			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
+			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
+			JBD2_FEATURE_INCOMPAT_CSUM_V2);
 	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
 		ret = jbd2_journal_set_features(sbi->s_journal,
 				compat, 0,
@@ -3202,11 +3226,8 @@ static int set_journal_csum_feature_set(struct super_block *sb)
 		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
 				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
 	} else {
-		jbd2_journal_clear_features(sbi->s_journal,
-				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
-				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
-				JBD2_FEATURE_INCOMPAT_CSUM_V3 |
-				JBD2_FEATURE_INCOMPAT_CSUM_V2);
+		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
+				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
 	}
 
 	return ret;
@@ -3436,7 +3457,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		logical_sb_block = sb_block;
 	}
 
-	if (!(bh = sb_bread(sb, logical_sb_block))) {
+	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
 		ext4_msg(sb, KERN_ERR, "unable to read superblock");
 		goto out_fail;
 	}
@@ -3487,8 +3508,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	}
 
 	/* Precompute checksum seed for all metadata */
-	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
-			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (ext4_has_metadata_csum(sb))
 		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
 					       sizeof(es->s_uuid));
 
@@ -3506,6 +3526,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 #ifdef CONFIG_EXT4_FS_POSIX_ACL
 	set_opt(sb, POSIX_ACL);
 #endif
+	/* don't forget to enable journal_csum when metadata_csum is enabled. */
+	if (ext4_has_metadata_csum(sb))
+		set_opt(sb, JOURNAL_CHECKSUM);
+
 	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
 		set_opt(sb, JOURNAL_DATA);
 	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
@@ -3519,8 +3543,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		set_opt(sb, ERRORS_CONT);
 	else
 		set_opt(sb, ERRORS_RO);
-	if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
-		set_opt(sb, BLOCK_VALIDITY);
+	/* block_validity enabled by default; disable with noblock_validity */
+	set_opt(sb, BLOCK_VALIDITY);
 	if (def_mount_opts & EXT4_DEFM_DISCARD)
 		set_opt(sb, DISCARD);
 
@@ -3646,7 +3670,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		brelse(bh);
 		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
 		offset = do_div(logical_sb_block, blocksize);
-		bh = sb_bread(sb, logical_sb_block);
+		bh = sb_bread_unmovable(sb, logical_sb_block);
 		if (!bh) {
 			ext4_msg(sb, KERN_ERR,
 			       "Can't read superblock on 2nd try");
@@ -3868,7 +3892,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 
 	for (i = 0; i < db_count; i++) {
 		block = descriptor_loc(sb, logical_sb_block, i);
-		sbi->s_group_desc[i] = sb_bread(sb, block);
+		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
 		if (!sbi->s_group_desc[i]) {
 			ext4_msg(sb, KERN_ERR,
 			       "can't read group descriptor %d", i);
@@ -3890,13 +3914,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	sbi->s_err_report.data = (unsigned long) sb;
 
 	/* Register extent status tree shrinker */
-	ext4_es_register_shrinker(sbi);
-
-	err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0, GFP_KERNEL);
-	if (err) {
-		ext4_msg(sb, KERN_ERR, "insufficient memory");
+	if (ext4_es_register_shrinker(sbi))
 		goto failed_mount3;
-	}
 
 	sbi->s_stripe = ext4_get_stripe_size(sbi);
 	sbi->s_extent_max_zeroout_kb = 32;
@@ -3904,11 +3923,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	/*
 	 * set up enough so that it can read an inode
 	 */
-	if (!test_opt(sb, NOLOAD) &&
-	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
-		sb->s_op = &ext4_sops;
-	else
-		sb->s_op = &ext4_nojournal_sops;
+	sb->s_op = &ext4_sops;
 	sb->s_export_op = &ext4_export_ops;
 	sb->s_xattr = ext4_xattr_handlers;
 #ifdef CONFIG_QUOTA
@@ -3932,7 +3947,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
 	    !(sb->s_flags & MS_RDONLY))
 		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
-			goto failed_mount3;
+			goto failed_mount3a;
 
 	/*
 	 * The first inode we look at is the journal inode.  Don't try
@@ -3941,7 +3956,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	if (!test_opt(sb, NOLOAD) &&
 	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
 		if (ext4_load_journal(sb, es, journal_devnum))
-			goto failed_mount3;
+			goto failed_mount3a;
 	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
 	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
 		ext4_msg(sb, KERN_ERR, "required journal recovery "
@@ -4229,10 +4244,10 @@ failed_mount_wq:
 		jbd2_journal_destroy(sbi->s_journal);
 		sbi->s_journal = NULL;
 	}
-failed_mount3:
+failed_mount3a:
 	ext4_es_unregister_shrinker(sbi);
+failed_mount3:
 	del_timer_sync(&sbi->s_err_report);
-	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
 	if (sbi->s_mmp_tsk)
 		kthread_stop(sbi->s_mmp_tsk);
 failed_mount2:
@@ -4247,7 +4262,7 @@ failed_mount:
 		remove_proc_entry(sb->s_id, ext4_proc_root);
 	}
 #ifdef CONFIG_QUOTA
-	for (i = 0; i < MAXQUOTAS; i++)
+	for (i = 0; i < EXT4_MAXQUOTAS; i++)
 		kfree(sbi->s_qf_names[i]);
 #endif
 	ext4_blkdev_remove(sbi);
@@ -4375,6 +4390,15 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb,
 		goto out_bdev;
 	}
 
+	if ((le32_to_cpu(es->s_feature_ro_compat) &
+	     EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
+	    es->s_checksum != ext4_superblock_csum(sb, es)) {
+		ext4_msg(sb, KERN_ERR, "external journal has "
+				       "corrupt superblock");
+		brelse(bh);
+		goto out_bdev;
+	}
+
 	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
 		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
 		brelse(bh);
@@ -4677,15 +4701,19 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
 	 * being sent at the end of the function. But we can skip it if
 	 * transaction_commit will do it for us.
 	 */
-	target = jbd2_get_latest_transaction(sbi->s_journal);
-	if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
-	    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
+	if (sbi->s_journal) {
+		target = jbd2_get_latest_transaction(sbi->s_journal);
+		if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
+		    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
+			needs_barrier = true;
+
+		if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
+			if (wait)
+				ret = jbd2_log_wait_commit(sbi->s_journal,
+							   target);
+		}
+	} else if (wait && test_opt(sb, BARRIER))
 		needs_barrier = true;
-
-	if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
-		if (wait)
-			ret = jbd2_log_wait_commit(sbi->s_journal, target);
-	}
 	if (needs_barrier) {
 		int err;
 		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
@@ -4696,19 +4724,6 @@ static int ext4_sync_fs(struct super_block *sb, int wait)
 	return ret;
 }
 
-static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
-{
-	int ret = 0;
-
-	trace_ext4_sync_fs(sb, wait);
-	flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
-	dquot_writeback_dquots(sb, -1);
-	if (wait && test_opt(sb, BARRIER))
-		ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
-
-	return ret;
-}
-
 /*
  * LVM calls this function before a (read-only) snapshot is created.  This
  * gives us a chance to flush the journal completely and mark the fs clean.
@@ -4727,23 +4742,26 @@ static int ext4_freeze(struct super_block *sb)
 
 	journal = EXT4_SB(sb)->s_journal;
 
-	/* Now we set up the journal barrier. */
-	jbd2_journal_lock_updates(journal);
+	if (journal) {
+		/* Now we set up the journal barrier. */
+		jbd2_journal_lock_updates(journal);
 
-	/*
-	 * Don't clear the needs_recovery flag if we failed to flush
-	 * the journal.
-	 */
-	error = jbd2_journal_flush(journal);
-	if (error < 0)
-		goto out;
+		/*
+		 * Don't clear the needs_recovery flag if we failed to
+		 * flush the journal.
+		 */
+		error = jbd2_journal_flush(journal);
+		if (error < 0)
+			goto out;
+	}
 
 	/* Journal blocked and flushed, clear needs_recovery flag. */
 	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
 	error = ext4_commit_super(sb, 1);
 out:
-	/* we rely on upper layer to stop further updates */
-	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+	if (journal)
+		/* we rely on upper layer to stop further updates */
+		jbd2_journal_unlock_updates(journal);
 	return error;
 }
 
@@ -4774,7 +4792,7 @@ struct ext4_mount_options {
 	u32 s_min_batch_time, s_max_batch_time;
 #ifdef CONFIG_QUOTA
 	int s_jquota_fmt;
-	char *s_qf_names[MAXQUOTAS];
+	char *s_qf_names[EXT4_MAXQUOTAS];
 #endif
 };
 
@@ -4804,7 +4822,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 	old_opts.s_max_batch_time = sbi->s_max_batch_time;
 #ifdef CONFIG_QUOTA
 	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
-	for (i = 0; i < MAXQUOTAS; i++)
+	for (i = 0; i < EXT4_MAXQUOTAS; i++)
 		if (sbi->s_qf_names[i]) {
 			old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
 							 GFP_KERNEL);
@@ -4828,6 +4846,14 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 		goto restore_opts;
 	}
 
+	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
+	    test_opt(sb, JOURNAL_CHECKSUM)) {
+		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
+			 "during remount not supported");
+		err = -EINVAL;
+		goto restore_opts;
+	}
+
 	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
 		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
 			ext4_msg(sb, KERN_ERR, "can't mount with "
@@ -4965,7 +4991,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 
 #ifdef CONFIG_QUOTA
 	/* Release old quota file names */
-	for (i = 0; i < MAXQUOTAS; i++)
+	for (i = 0; i < EXT4_MAXQUOTAS; i++)
 		kfree(old_opts.s_qf_names[i]);
 	if (enable_quota) {
 		if (sb_any_quota_suspended(sb))
@@ -4994,7 +5020,7 @@ restore_opts:
 	sbi->s_max_batch_time = old_opts.s_max_batch_time;
 #ifdef CONFIG_QUOTA
 	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
-	for (i = 0; i < MAXQUOTAS; i++) {
+	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
 		kfree(sbi->s_qf_names[i]);
 		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
 	}
@@ -5197,7 +5223,7 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
 {
 	int err;
 	struct inode *qf_inode;
-	unsigned long qf_inums[MAXQUOTAS] = {
+	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
 		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
 		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
 	};
@@ -5225,13 +5251,13 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
 static int ext4_enable_quotas(struct super_block *sb)
 {
 	int type, err = 0;
-	unsigned long qf_inums[MAXQUOTAS] = {
+	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
 		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
 		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
 	};
 
 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
-	for (type = 0; type < MAXQUOTAS; type++) {
+	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
 		if (qf_inums[type]) {
 			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
 						DQUOT_USAGE_ENABLED);
@@ -5309,7 +5335,6 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 {
 	struct inode *inode = sb_dqopt(sb)->files[type];
 	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
-	int err = 0;
 	int offset = off & (sb->s_blocksize - 1);
 	int tocopy;
 	size_t toread;
@@ -5324,9 +5349,9 @@ static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
 	while (toread > 0) {
 		tocopy = sb->s_blocksize - offset < toread ?
 				sb->s_blocksize - offset : toread;
-		bh = ext4_bread(NULL, inode, blk, 0, &err);
-		if (err)
-			return err;
+		bh = ext4_bread(NULL, inode, blk, 0);
+		if (IS_ERR(bh))
+			return PTR_ERR(bh);
 		if (!bh)	/* A hole? */
 			memset(data, 0, tocopy);
 		else
@@ -5347,8 +5372,7 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
 {
 	struct inode *inode = sb_dqopt(sb)->files[type];
 	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
-	int err = 0;
-	int offset = off & (sb->s_blocksize - 1);
+	int err, offset = off & (sb->s_blocksize - 1);
 	struct buffer_head *bh;
 	handle_t *handle = journal_current_handle();
 
@@ -5369,14 +5393,16 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
 		return -EIO;
 	}
 
-	bh = ext4_bread(handle, inode, blk, 1, &err);
+	bh = ext4_bread(handle, inode, blk, 1);
+	if (IS_ERR(bh))
+		return PTR_ERR(bh);
 	if (!bh)
 		goto out;
 	BUFFER_TRACE(bh, "get write access");
 	err = ext4_journal_get_write_access(handle, bh);
 	if (err) {
 		brelse(bh);
-		goto out;
+		return err;
 	}
 	lock_buffer(bh);
 	memcpy(bh->b_data+offset, data, len);
@@ -5385,8 +5411,6 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
 	err = ext4_handle_dirty_metadata(handle, NULL, bh);
 	brelse(bh);
 out:
-	if (err)
-		return err;
 	if (inode->i_size < off + len) {
 		i_size_write(inode, off + len);
 		EXT4_I(inode)->i_disksize = inode->i_size;
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index e7387337060c..1e09fc77395c 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -142,8 +142,7 @@ static int ext4_xattr_block_csum_verify(struct inode *inode,
 					sector_t block_nr,
 					struct ext4_xattr_header *hdr)
 {
-	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
+	if (ext4_has_metadata_csum(inode->i_sb) &&
 	    (hdr->h_checksum != ext4_xattr_block_csum(inode, block_nr, hdr)))
 		return 0;
 	return 1;
@@ -153,8 +152,7 @@ static void ext4_xattr_block_csum_set(struct inode *inode,
 				      sector_t block_nr,
 				      struct ext4_xattr_header *hdr)
 {
-	if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+	if (!ext4_has_metadata_csum(inode->i_sb))
 		return;
 
 	hdr->h_checksum = ext4_xattr_block_csum(inode, block_nr, hdr);
@@ -190,14 +188,28 @@ ext4_listxattr(struct dentry *dentry, char *buffer, size_t size)
 }
 
 static int
-ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end)
+ext4_xattr_check_names(struct ext4_xattr_entry *entry, void *end,
+		       void *value_start)
 {
-	while (!IS_LAST_ENTRY(entry)) {
-		struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(entry);
+	struct ext4_xattr_entry *e = entry;
+
+	while (!IS_LAST_ENTRY(e)) {
+		struct ext4_xattr_entry *next = EXT4_XATTR_NEXT(e);
 		if ((void *)next >= end)
 			return -EIO;
-		entry = next;
+		e = next;
 	}
+
+	while (!IS_LAST_ENTRY(entry)) {
+		if (entry->e_value_size != 0 &&
+		    (value_start + le16_to_cpu(entry->e_value_offs) <
+		     (void *)e + sizeof(__u32) ||
+		     value_start + le16_to_cpu(entry->e_value_offs) +
+		    le32_to_cpu(entry->e_value_size) > end))
+			return -EIO;
+		entry = EXT4_XATTR_NEXT(entry);
+	}
+
 	return 0;
 }
 
@@ -214,7 +226,8 @@ ext4_xattr_check_block(struct inode *inode, struct buffer_head *bh)
 		return -EIO;
 	if (!ext4_xattr_block_csum_verify(inode, bh->b_blocknr, BHDR(bh)))
 		return -EIO;
-	error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size);
+	error = ext4_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size,
+				       bh->b_data);
 	if (!error)
 		set_buffer_verified(bh);
 	return error;
@@ -331,7 +344,7 @@ ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name,
 	header = IHDR(inode, raw_inode);
 	entry = IFIRST(header);
 	end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
-	error = ext4_xattr_check_names(entry, end);
+	error = ext4_xattr_check_names(entry, end, entry);
 	if (error)
 		goto cleanup;
 	error = ext4_xattr_find_entry(&entry, name_index, name,
@@ -463,7 +476,7 @@ ext4_xattr_ibody_list(struct dentry *dentry, char *buffer, size_t buffer_size)
 	raw_inode = ext4_raw_inode(&iloc);
 	header = IHDR(inode, raw_inode);
 	end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
-	error = ext4_xattr_check_names(IFIRST(header), end);
+	error = ext4_xattr_check_names(IFIRST(header), end, IFIRST(header));
 	if (error)
 		goto cleanup;
 	error = ext4_xattr_list_entries(dentry, IFIRST(header),
@@ -899,14 +912,8 @@ inserted:
 			if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
 				goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
 
-			/*
-			 * take i_data_sem because we will test
-			 * i_delalloc_reserved_flag in ext4_mb_new_blocks
-			 */
-			down_read(&EXT4_I(inode)->i_data_sem);
 			block = ext4_new_meta_blocks(handle, inode, goal, 0,
 						     NULL, &error);
-			up_read((&EXT4_I(inode)->i_data_sem));
 			if (error)
 				goto cleanup;
 
@@ -986,7 +993,8 @@ int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
 	is->s.here = is->s.first;
 	is->s.end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
 	if (ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
-		error = ext4_xattr_check_names(IFIRST(header), is->s.end);
+		error = ext4_xattr_check_names(IFIRST(header), is->s.end,
+					       IFIRST(header));
 		if (error)
 			return error;
 		/* Find the named attribute. */
diff --git a/fs/internal.h b/fs/internal.h
index 9477f8f6aefc..757ba2abf21e 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -47,7 +47,6 @@ extern void __init chrdev_init(void);
 /*
  * namei.c
  */
-extern int __inode_permission(struct inode *, int);
 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
 			   const char *, unsigned int, struct path *);
@@ -139,12 +138,6 @@ extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 
 /*
- * splice.c
- */
-extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
-		loff_t *opos, size_t len, unsigned int flags);
-
-/*
  * pipe.c
  */
 extern const struct file_operations pipefifo_fops;
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 881b3bd0143f..fe839b915116 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -29,13 +29,9 @@
 #define BEQUIET
 
 static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
-static int isofs_hash(const struct dentry *parent, struct qstr *qstr);
 static int isofs_dentry_cmpi(const struct dentry *parent,
 		const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name);
-static int isofs_dentry_cmp(const struct dentry *parent,
-		const struct dentry *dentry,
-		unsigned int len, const char *str, const struct qstr *name);
 
 #ifdef CONFIG_JOLIET
 static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
@@ -135,10 +131,6 @@ static const struct super_operations isofs_sops = {
 
 static const struct dentry_operations isofs_dentry_ops[] = {
 	{
-		.d_hash		= isofs_hash,
-		.d_compare	= isofs_dentry_cmp,
-	},
-	{
 		.d_hash		= isofs_hashi,
 		.d_compare	= isofs_dentry_cmpi,
 	},
@@ -258,25 +250,12 @@ static int isofs_dentry_cmp_common(
 }
 
 static int
-isofs_hash(const struct dentry *dentry, struct qstr *qstr)
-{
-	return isofs_hash_common(qstr, 0);
-}
-
-static int
 isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
 {
 	return isofs_hashi_common(qstr, 0);
 }
 
 static int
-isofs_dentry_cmp(const struct dentry *parent, const struct dentry *dentry,
-		unsigned int len, const char *str, const struct qstr *name)
-{
-	return isofs_dentry_cmp_common(len, str, name, 0, 0);
-}
-
-static int
 isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
 		unsigned int len, const char *str, const struct qstr *name)
 {
@@ -930,7 +909,8 @@ root_found:
 	if (opt.check == 'r')
 		table++;
 
-	s->s_d_op = &isofs_dentry_ops[table];
+	if (table)
+		s->s_d_op = &isofs_dentry_ops[table - 1];
 
 	/* get the root dentry */
 	s->s_root = d_make_root(inode);
diff --git a/fs/isofs/namei.c b/fs/isofs/namei.c
index 95295640d9c8..7b543e6b6526 100644
--- a/fs/isofs/namei.c
+++ b/fs/isofs/namei.c
@@ -18,25 +18,10 @@ static int
 isofs_cmp(struct dentry *dentry, const char *compare, int dlen)
 {
 	struct qstr qstr;
-
-	if (!compare)
-		return 1;
-
-	/* check special "." and ".." files */
-	if (dlen == 1) {
-		/* "." */
-		if (compare[0] == 0) {
-			if (!dentry->d_name.len)
-				return 0;
-			compare = ".";
-		} else if (compare[0] == 1) {
-			compare = "..";
-			dlen = 2;
-		}
-	}
-
 	qstr.name = compare;
 	qstr.len = dlen;
+	if (likely(!dentry->d_op))
+		return dentry->d_name.len != dlen || memcmp(dentry->d_name.name, compare, dlen);
 	return dentry->d_op->d_compare(NULL, NULL, dentry->d_name.len, dentry->d_name.name, &qstr);
 }
 
@@ -146,7 +131,8 @@ isofs_find_entry(struct inode *dir, struct dentry *dentry,
 				(!(de->flags[-sbi->s_high_sierra] & 1))) &&
 			(sbi->s_showassoc ||
 				(!(de->flags[-sbi->s_high_sierra] & 4)))) {
-			match = (isofs_cmp(dentry, dpnt, dlen) == 0);
+			if (dpnt && (dlen > 1 || dpnt[0] > 1))
+				match = (isofs_cmp(dentry, dpnt, dlen) == 0);
 		}
 		if (match) {
 			isofs_normalize_block_and_offset(de,
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 06fe11e0abfa..aab8549591e7 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -886,7 +886,7 @@ journal_t * journal_init_inode (struct inode *inode)
 		goto out_err;
 	}
 
-	bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
+	bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
 	if (!bh) {
 		printk(KERN_ERR
 		       "%s: Cannot get buffer for journal superblock\n",
diff --git a/fs/jbd/revoke.c b/fs/jbd/revoke.c
index 8898bbd2b61e..dcead636c33b 100644
--- a/fs/jbd/revoke.c
+++ b/fs/jbd/revoke.c
@@ -93,6 +93,7 @@
 #include <linux/bio.h>
 #endif
 #include <linux/log2.h>
+#include <linux/hash.h>
 
 static struct kmem_cache *revoke_record_cache;
 static struct kmem_cache *revoke_table_cache;
@@ -129,15 +130,11 @@ static void flush_descriptor(journal_t *, struct journal_head *, int, int);
 
 /* Utility functions to maintain the revoke table */
 
-/* Borrowed from buffer.c: this is a tried and tested block hash function */
 static inline int hash(journal_t *journal, unsigned int block)
 {
 	struct jbd_revoke_table_s *table = journal->j_revoke;
-	int hash_shift = table->hash_shift;
 
-	return ((block << (hash_shift - 6)) ^
-		(block >> 13) ^
-		(block << (hash_shift - 12))) & (table->hash_size - 1);
+	return hash_32(block, table->hash_shift);
 }
 
 static int insert_revoke_hash(journal_t *journal, unsigned int blocknr,
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 7f34f4716165..988b32ed4c87 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -96,15 +96,8 @@ static int __try_to_free_cp_buf(struct journal_head *jh)
 
 	if (jh->b_transaction == NULL && !buffer_locked(bh) &&
 	    !buffer_dirty(bh) && !buffer_write_io_error(bh)) {
-		/*
-		 * Get our reference so that bh cannot be freed before
-		 * we unlock it
-		 */
-		get_bh(bh);
 		JBUFFER_TRACE(jh, "remove from checkpoint list");
 		ret = __jbd2_journal_remove_checkpoint(jh) + 1;
-		BUFFER_TRACE(bh, "release");
-		__brelse(bh);
 	}
 	return ret;
 }
@@ -122,8 +115,6 @@ void __jbd2_log_wait_for_space(journal_t *journal)
 
 	nblocks = jbd2_space_needed(journal);
 	while (jbd2_log_space_left(journal) < nblocks) {
-		if (journal->j_flags & JBD2_ABORT)
-			return;
 		write_unlock(&journal->j_state_lock);
 		mutex_lock(&journal->j_checkpoint_mutex);
 
@@ -139,6 +130,10 @@ void __jbd2_log_wait_for_space(journal_t *journal)
 		 * trace for forensic evidence.
 		 */
 		write_lock(&journal->j_state_lock);
+		if (journal->j_flags & JBD2_ABORT) {
+			mutex_unlock(&journal->j_checkpoint_mutex);
+			return;
+		}
 		spin_lock(&journal->j_list_lock);
 		nblocks = jbd2_space_needed(journal);
 		space_left = jbd2_log_space_left(journal);
@@ -183,58 +178,6 @@ void __jbd2_log_wait_for_space(journal_t *journal)
 	}
 }
 
-/*
- * Clean up transaction's list of buffers submitted for io.
- * We wait for any pending IO to complete and remove any clean
- * buffers. Note that we take the buffers in the opposite ordering
- * from the one in which they were submitted for IO.
- *
- * Return 0 on success, and return <0 if some buffers have failed
- * to be written out.
- *
- * Called with j_list_lock held.
- */
-static int __wait_cp_io(journal_t *journal, transaction_t *transaction)
-{
-	struct journal_head *jh;
-	struct buffer_head *bh;
-	tid_t this_tid;
-	int released = 0;
-	int ret = 0;
-
-	this_tid = transaction->t_tid;
-restart:
-	/* Did somebody clean up the transaction in the meanwhile? */
-	if (journal->j_checkpoint_transactions != transaction ||
-			transaction->t_tid != this_tid)
-		return ret;
-	while (!released && transaction->t_checkpoint_io_list) {
-		jh = transaction->t_checkpoint_io_list;
-		bh = jh2bh(jh);
-		get_bh(bh);
-		if (buffer_locked(bh)) {
-			spin_unlock(&journal->j_list_lock);
-			wait_on_buffer(bh);
-			/* the journal_head may have gone by now */
-			BUFFER_TRACE(bh, "brelse");
-			__brelse(bh);
-			spin_lock(&journal->j_list_lock);
-			goto restart;
-		}
-		if (unlikely(buffer_write_io_error(bh)))
-			ret = -EIO;
-
-		/*
-		 * Now in whatever state the buffer currently is, we know that
-		 * it has been written out and so we can drop it from the list
-		 */
-		released = __jbd2_journal_remove_checkpoint(jh);
-		__brelse(bh);
-	}
-
-	return ret;
-}
-
 static void
 __flush_batch(journal_t *journal, int *batch_count)
 {
@@ -255,81 +198,6 @@ __flush_batch(journal_t *journal, int *batch_count)
 }
 
 /*
- * Try to flush one buffer from the checkpoint list to disk.
- *
- * Return 1 if something happened which requires us to abort the current
- * scan of the checkpoint list.  Return <0 if the buffer has failed to
- * be written out.
- *
- * Called with j_list_lock held and drops it if 1 is returned
- */
-static int __process_buffer(journal_t *journal, struct journal_head *jh,
-			    int *batch_count, transaction_t *transaction)
-{
-	struct buffer_head *bh = jh2bh(jh);
-	int ret = 0;
-
-	if (buffer_locked(bh)) {
-		get_bh(bh);
-		spin_unlock(&journal->j_list_lock);
-		wait_on_buffer(bh);
-		/* the journal_head may have gone by now */
-		BUFFER_TRACE(bh, "brelse");
-		__brelse(bh);
-		ret = 1;
-	} else if (jh->b_transaction != NULL) {
-		transaction_t *t = jh->b_transaction;
-		tid_t tid = t->t_tid;
-
-		transaction->t_chp_stats.cs_forced_to_close++;
-		spin_unlock(&journal->j_list_lock);
-		if (unlikely(journal->j_flags & JBD2_UNMOUNT))
-			/*
-			 * The journal thread is dead; so starting and
-			 * waiting for a commit to finish will cause
-			 * us to wait for a _very_ long time.
-			 */
-			printk(KERN_ERR "JBD2: %s: "
-			       "Waiting for Godot: block %llu\n",
-			       journal->j_devname,
-			       (unsigned long long) bh->b_blocknr);
-		jbd2_log_start_commit(journal, tid);
-		jbd2_log_wait_commit(journal, tid);
-		ret = 1;
-	} else if (!buffer_dirty(bh)) {
-		ret = 1;
-		if (unlikely(buffer_write_io_error(bh)))
-			ret = -EIO;
-		get_bh(bh);
-		BUFFER_TRACE(bh, "remove from checkpoint");
-		__jbd2_journal_remove_checkpoint(jh);
-		spin_unlock(&journal->j_list_lock);
-		__brelse(bh);
-	} else {
-		/*
-		 * Important: we are about to write the buffer, and
-		 * possibly block, while still holding the journal lock.
-		 * We cannot afford to let the transaction logic start
-		 * messing around with this buffer before we write it to
-		 * disk, as that would break recoverability.
-		 */
-		BUFFER_TRACE(bh, "queue");
-		get_bh(bh);
-		J_ASSERT_BH(bh, !buffer_jwrite(bh));
-		journal->j_chkpt_bhs[*batch_count] = bh;
-		__buffer_relink_io(jh);
-		transaction->t_chp_stats.cs_written++;
-		(*batch_count)++;
-		if (*batch_count == JBD2_NR_BATCH) {
-			spin_unlock(&journal->j_list_lock);
-			__flush_batch(journal, batch_count);
-			ret = 1;
-		}
-	}
-	return ret;
-}
-
-/*
  * Perform an actual checkpoint. We take the first transaction on the
  * list of transactions to be checkpointed and send all its buffers
  * to disk. We submit larger chunks of data at once.
@@ -339,9 +207,11 @@ static int __process_buffer(journal_t *journal, struct journal_head *jh,
  */
 int jbd2_log_do_checkpoint(journal_t *journal)
 {
-	transaction_t *transaction;
-	tid_t this_tid;
-	int result;
+	struct journal_head	*jh;
+	struct buffer_head	*bh;
+	transaction_t		*transaction;
+	tid_t			this_tid;
+	int			result, batch_count = 0;
 
 	jbd_debug(1, "Start checkpoint\n");
 
@@ -374,45 +244,117 @@ restart:
 	 * done (maybe it's a new transaction, but it fell at the same
 	 * address).
 	 */
-	if (journal->j_checkpoint_transactions == transaction &&
-			transaction->t_tid == this_tid) {
-		int batch_count = 0;
-		struct journal_head *jh;
-		int retry = 0, err;
-
-		while (!retry && transaction->t_checkpoint_list) {
-			jh = transaction->t_checkpoint_list;
-			retry = __process_buffer(journal, jh, &batch_count,
-						 transaction);
-			if (retry < 0 && !result)
-				result = retry;
-			if (!retry && (need_resched() ||
-				spin_needbreak(&journal->j_list_lock))) {
-				spin_unlock(&journal->j_list_lock);
-				retry = 1;
-				break;
-			}
+	if (journal->j_checkpoint_transactions != transaction ||
+	    transaction->t_tid != this_tid)
+		goto out;
+
+	/* checkpoint all of the transaction's buffers */
+	while (transaction->t_checkpoint_list) {
+		jh = transaction->t_checkpoint_list;
+		bh = jh2bh(jh);
+
+		if (buffer_locked(bh)) {
+			spin_unlock(&journal->j_list_lock);
+			get_bh(bh);
+			wait_on_buffer(bh);
+			/* the journal_head may have gone by now */
+			BUFFER_TRACE(bh, "brelse");
+			__brelse(bh);
+			goto retry;
 		}
+		if (jh->b_transaction != NULL) {
+			transaction_t *t = jh->b_transaction;
+			tid_t tid = t->t_tid;
 
-		if (batch_count) {
-			if (!retry) {
-				spin_unlock(&journal->j_list_lock);
-				retry = 1;
-			}
-			__flush_batch(journal, &batch_count);
+			transaction->t_chp_stats.cs_forced_to_close++;
+			spin_unlock(&journal->j_list_lock);
+			if (unlikely(journal->j_flags & JBD2_UNMOUNT))
+				/*
+				 * The journal thread is dead; so
+				 * starting and waiting for a commit
+				 * to finish will cause us to wait for
+				 * a _very_ long time.
+				 */
+				printk(KERN_ERR
+		"JBD2: %s: Waiting for Godot: block %llu\n",
+		journal->j_devname, (unsigned long long) bh->b_blocknr);
+
+			jbd2_log_start_commit(journal, tid);
+			jbd2_log_wait_commit(journal, tid);
+			goto retry;
+		}
+		if (!buffer_dirty(bh)) {
+			if (unlikely(buffer_write_io_error(bh)) && !result)
+				result = -EIO;
+			BUFFER_TRACE(bh, "remove from checkpoint");
+			if (__jbd2_journal_remove_checkpoint(jh))
+				/* The transaction was released; we're done */
+				goto out;
+			continue;
 		}
+		/*
+		 * Important: we are about to write the buffer, and
+		 * possibly block, while still holding the journal
+		 * lock.  We cannot afford to let the transaction
+		 * logic start messing around with this buffer before
+		 * we write it to disk, as that would break
+		 * recoverability.
+		 */
+		BUFFER_TRACE(bh, "queue");
+		get_bh(bh);
+		J_ASSERT_BH(bh, !buffer_jwrite(bh));
+		journal->j_chkpt_bhs[batch_count++] = bh;
+		__buffer_relink_io(jh);
+		transaction->t_chp_stats.cs_written++;
+		if ((batch_count == JBD2_NR_BATCH) ||
+		    need_resched() ||
+		    spin_needbreak(&journal->j_list_lock))
+			goto unlock_and_flush;
+	}
 
-		if (retry) {
+	if (batch_count) {
+		unlock_and_flush:
+			spin_unlock(&journal->j_list_lock);
+		retry:
+			if (batch_count)
+				__flush_batch(journal, &batch_count);
 			spin_lock(&journal->j_list_lock);
 			goto restart;
+	}
+
+	/*
+	 * Now we issued all of the transaction's buffers, let's deal
+	 * with the buffers that are out for I/O.
+	 */
+restart2:
+	/* Did somebody clean up the transaction in the meanwhile? */
+	if (journal->j_checkpoint_transactions != transaction ||
+	    transaction->t_tid != this_tid)
+		goto out;
+
+	while (transaction->t_checkpoint_io_list) {
+		jh = transaction->t_checkpoint_io_list;
+		bh = jh2bh(jh);
+		if (buffer_locked(bh)) {
+			spin_unlock(&journal->j_list_lock);
+			get_bh(bh);
+			wait_on_buffer(bh);
+			/* the journal_head may have gone by now */
+			BUFFER_TRACE(bh, "brelse");
+			__brelse(bh);
+			spin_lock(&journal->j_list_lock);
+			goto restart2;
 		}
+		if (unlikely(buffer_write_io_error(bh)) && !result)
+			result = -EIO;
+
 		/*
-		 * Now we have cleaned up the first transaction's checkpoint
-		 * list. Let's clean up the second one
+		 * Now in whatever state the buffer currently is, we
+		 * know that it has been written out and so we can
+		 * drop it from the list
 		 */
-		err = __wait_cp_io(journal, transaction);
-		if (!result)
-			result = err;
+		if (__jbd2_journal_remove_checkpoint(jh))
+			break;
 	}
 out:
 	spin_unlock(&journal->j_list_lock);
@@ -478,18 +420,16 @@ int jbd2_cleanup_journal_tail(journal_t *journal)
  * Find all the written-back checkpoint buffers in the given list and
  * release them.
  *
- * Called with the journal locked.
  * Called with j_list_lock held.
- * Returns number of buffers reaped (for debug)
+ * Returns 1 if we freed the transaction, 0 otherwise.
  */
-
-static int journal_clean_one_cp_list(struct journal_head *jh, int *released)
+static int journal_clean_one_cp_list(struct journal_head *jh)
 {
 	struct journal_head *last_jh;
 	struct journal_head *next_jh = jh;
-	int ret, freed = 0;
+	int ret;
+	int freed = 0;
 
-	*released = 0;
 	if (!jh)
 		return 0;
 
@@ -498,13 +438,11 @@ static int journal_clean_one_cp_list(struct journal_head *jh, int *released)
 		jh = next_jh;
 		next_jh = jh->b_cpnext;
 		ret = __try_to_free_cp_buf(jh);
-		if (ret) {
-			freed++;
-			if (ret == 2) {
-				*released = 1;
-				return freed;
-			}
-		}
+		if (!ret)
+			return freed;
+		if (ret == 2)
+			return 1;
+		freed = 1;
 		/*
 		 * This function only frees up some memory
 		 * if possible so we dont have an obligation
@@ -523,49 +461,49 @@ static int journal_clean_one_cp_list(struct journal_head *jh, int *released)
  *
  * Find all the written-back checkpoint buffers in the journal and release them.
  *
- * Called with the journal locked.
  * Called with j_list_lock held.
- * Returns number of buffers reaped (for debug)
  */
-
-int __jbd2_journal_clean_checkpoint_list(journal_t *journal)
+void __jbd2_journal_clean_checkpoint_list(journal_t *journal)
 {
 	transaction_t *transaction, *last_transaction, *next_transaction;
-	int ret = 0;
-	int released;
+	int ret;
 
 	transaction = journal->j_checkpoint_transactions;
 	if (!transaction)
-		goto out;
+		return;
 
 	last_transaction = transaction->t_cpprev;
 	next_transaction = transaction;
 	do {
 		transaction = next_transaction;
 		next_transaction = transaction->t_cpnext;
-		ret += journal_clean_one_cp_list(transaction->
-				t_checkpoint_list, &released);
+		ret = journal_clean_one_cp_list(transaction->t_checkpoint_list);
 		/*
 		 * This function only frees up some memory if possible so we
 		 * dont have an obligation to finish processing. Bail out if
 		 * preemption requested:
 		 */
 		if (need_resched())
-			goto out;
-		if (released)
+			return;
+		if (ret)
 			continue;
 		/*
 		 * It is essential that we are as careful as in the case of
 		 * t_checkpoint_list with removing the buffer from the list as
 		 * we can possibly see not yet submitted buffers on io_list
 		 */
-		ret += journal_clean_one_cp_list(transaction->
-				t_checkpoint_io_list, &released);
+		ret = journal_clean_one_cp_list(transaction->
+				t_checkpoint_io_list);
 		if (need_resched())
-			goto out;
+			return;
+		/*
+		 * Stop scanning if we couldn't free the transaction. This
+		 * avoids pointless scanning of transactions which still
+		 * weren't checkpointed.
+		 */
+		if (!ret)
+			return;
 	} while (transaction != last_transaction);
-out:
-	return ret;
 }
 
 /*
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 19d74d86d99c..e4dc74713a43 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1237,7 +1237,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
 		goto out_err;
 	}
 
-	bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
+	bh = getblk_unmovable(journal->j_dev, blocknr, journal->j_blocksize);
 	if (!bh) {
 		printk(KERN_ERR
 		       "%s: Cannot get buffer for journal superblock\n",
@@ -1522,14 +1522,6 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
-	if (jbd2_journal_has_csum_v2or3(journal) &&
-	    JBD2_HAS_COMPAT_FEATURE(journal, JBD2_FEATURE_COMPAT_CHECKSUM)) {
-		/* Can't have checksum v1 and v2 on at the same time! */
-		printk(KERN_ERR "JBD2: Can't enable checksumming v1 and v2 "
-		       "at the same time!\n");
-		goto out;
-	}
-
 	if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V2) &&
 	    JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_CSUM_V3)) {
 		/* Can't have checksum v2 and v3 at the same time! */
@@ -1538,6 +1530,14 @@ static int journal_get_superblock(journal_t *journal)
 		goto out;
 	}
 
+	if (jbd2_journal_has_csum_v2or3(journal) &&
+	    JBD2_HAS_COMPAT_FEATURE(journal, JBD2_FEATURE_COMPAT_CHECKSUM)) {
+		/* Can't have checksum v1 and v2 on at the same time! */
+		printk(KERN_ERR "JBD2: Can't enable checksumming v1 and v2/3 "
+		       "at the same time!\n");
+		goto out;
+	}
+
 	if (!jbd2_verify_csum_type(journal, sb)) {
 		printk(KERN_ERR "JBD2: Unknown checksum type\n");
 		goto out;
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 9b329b55ffe3..bcbef08a4d8f 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -525,6 +525,7 @@ static int do_one_pass(journal_t *journal,
 			    !jbd2_descr_block_csum_verify(journal,
 							  bh->b_data)) {
 				err = -EIO;
+				brelse(bh);
 				goto failed;
 			}
 
diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
index d5e95a175c92..c6cbaef2bda1 100644
--- a/fs/jbd2/revoke.c
+++ b/fs/jbd2/revoke.c
@@ -92,6 +92,7 @@
 #include <linux/init.h>
 #include <linux/bio.h>
 #include <linux/log2.h>
+#include <linux/hash.h>
 #endif
 
 static struct kmem_cache *jbd2_revoke_record_cache;
@@ -130,16 +131,9 @@ static void flush_descriptor(journal_t *, struct buffer_head *, int, int);
 
 /* Utility functions to maintain the revoke table */
 
-/* Borrowed from buffer.c: this is a tried and tested block hash function */
 static inline int hash(journal_t *journal, unsigned long long block)
 {
-	struct jbd2_revoke_table_s *table = journal->j_revoke;
-	int hash_shift = table->hash_shift;
-	int hash = (int)block ^ (int)((block >> 31) >> 1);
-
-	return ((hash << (hash_shift - 6)) ^
-		(hash >> 13) ^
-		(hash << (hash_shift - 12))) & (table->hash_size - 1);
+	return hash_64(block, journal->j_revoke->hash_shift);
 }
 
 static int insert_revoke_hash(journal_t *journal, unsigned long long blocknr,
diff --git a/fs/namei.c b/fs/namei.c
index 43927d14db67..db5fe86319e6 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -416,6 +416,7 @@ int __inode_permission(struct inode *inode, int mask)
 
 	return security_inode_permission(inode, mask);
 }
+EXPORT_SYMBOL(__inode_permission);
 
 /**
  * sb_permission - Check superblock-level permissions
@@ -2383,22 +2384,17 @@ kern_path_mountpoint(int dfd, const char *name, struct path *path,
 }
 EXPORT_SYMBOL(kern_path_mountpoint);
 
-/*
- * It's inline, so penalty for filesystems that don't use sticky bit is
- * minimal.
- */
-static inline int check_sticky(struct inode *dir, struct inode *inode)
+int __check_sticky(struct inode *dir, struct inode *inode)
 {
 	kuid_t fsuid = current_fsuid();
 
-	if (!(dir->i_mode & S_ISVTX))
-		return 0;
 	if (uid_eq(inode->i_uid, fsuid))
 		return 0;
 	if (uid_eq(dir->i_uid, fsuid))
 		return 0;
 	return !capable_wrt_inode_uidgid(inode, CAP_FOWNER);
 }
+EXPORT_SYMBOL(__check_sticky);
 
 /*
  *	Check whether we can remove a link victim from directory dir, check
@@ -2501,7 +2497,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
 	}
 
 	mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT);
-	mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD);
+	mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_PARENT2);
 	return NULL;
 }
 EXPORT_SYMBOL(lock_rename);
@@ -3064,9 +3060,12 @@ finish_open_created:
 	error = may_open(&nd->path, acc_mode, open_flag);
 	if (error)
 		goto out;
-	file->f_path.mnt = nd->path.mnt;
-	error = finish_open(file, nd->path.dentry, NULL, opened);
-	if (error) {
+
+	BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
+	error = vfs_open(&nd->path, file, current_cred());
+	if (!error) {
+		*opened |= FILE_OPENED;
+	} else {
 		if (error == -EOPENSTALE)
 			goto stale_open;
 		goto out;
@@ -3155,7 +3154,8 @@ static int do_tmpfile(int dfd, struct filename *pathname,
 	if (error)
 		goto out2;
 	audit_inode(pathname, nd->path.dentry, 0);
-	error = may_open(&nd->path, op->acc_mode, op->open_flag);
+	/* Don't check for other permissions, the inode was just created */
+	error = may_open(&nd->path, MAY_OPEN, op->open_flag);
 	if (error)
 		goto out2;
 	file->f_path.mnt = nd->path.mnt;
@@ -4210,12 +4210,16 @@ SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
 	bool should_retry = false;
 	int error;
 
-	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
 		return -EINVAL;
 
-	if ((flags & RENAME_NOREPLACE) && (flags & RENAME_EXCHANGE))
+	if ((flags & (RENAME_NOREPLACE | RENAME_WHITEOUT)) &&
+	    (flags & RENAME_EXCHANGE))
 		return -EINVAL;
 
+	if ((flags & RENAME_WHITEOUT) && !capable(CAP_MKNOD))
+		return -EPERM;
+
 retry:
 	from = user_path_parent(olddfd, oldname, &oldnd, lookup_flags);
 	if (IS_ERR(from)) {
@@ -4347,6 +4351,20 @@ SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newna
 	return sys_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
 }
 
+int vfs_whiteout(struct inode *dir, struct dentry *dentry)
+{
+	int error = may_create(dir, dentry);
+	if (error)
+		return error;
+
+	if (!dir->i_op->mknod)
+		return -EPERM;
+
+	return dir->i_op->mknod(dir, dentry,
+				S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV);
+}
+EXPORT_SYMBOL(vfs_whiteout);
+
 int readlink_copy(char __user *buffer, int buflen, const char *link)
 {
 	int len = PTR_ERR(link);
diff --git a/fs/namespace.c b/fs/namespace.c
index fbba8b17330d..5b66b2b3624d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1686,6 +1686,33 @@ void drop_collected_mounts(struct vfsmount *mnt)
 	namespace_unlock();
 }
 
+/**
+ * clone_private_mount - create a private clone of a path
+ *
+ * This creates a new vfsmount, which will be the clone of @path.  The new will
+ * not be attached anywhere in the namespace and will be private (i.e. changes
+ * to the originating mount won't be propagated into this).
+ *
+ * Release with mntput().
+ */
+struct vfsmount *clone_private_mount(struct path *path)
+{
+	struct mount *old_mnt = real_mount(path->mnt);
+	struct mount *new_mnt;
+
+	if (IS_MNT_UNBINDABLE(old_mnt))
+		return ERR_PTR(-EINVAL);
+
+	down_read(&namespace_sem);
+	new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);
+	up_read(&namespace_sem);
+	if (IS_ERR(new_mnt))
+		return ERR_CAST(new_mnt);
+
+	return &new_mnt->mnt;
+}
+EXPORT_SYMBOL_GPL(clone_private_mount);
+
 int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
 		   struct vfsmount *root)
 {
diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 5228f201d3d5..4f46f7a05289 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -378,7 +378,7 @@ bl_write_pagelist(struct nfs_pgio_header *header, int sync)
 	loff_t offset = header->args.offset;
 	size_t count = header->args.count;
 	struct page **pages = header->args.pages;
-	int pg_index = pg_index = header->args.pgbase >> PAGE_CACHE_SHIFT;
+	int pg_index = header->args.pgbase >> PAGE_CACHE_SHIFT;
 	unsigned int pg_len;
 	struct blk_plug plug;
 	int i;
diff --git a/fs/nfs/blocklayout/rpc_pipefs.c b/fs/nfs/blocklayout/rpc_pipefs.c
index e966c023b1b7..acbf9ca4018c 100644
--- a/fs/nfs/blocklayout/rpc_pipefs.c
+++ b/fs/nfs/blocklayout/rpc_pipefs.c
@@ -65,17 +65,18 @@ bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b,
 
 	dprintk("%s CREATING PIPEFS MESSAGE\n", __func__);
 
+	mutex_lock(&nn->bl_mutex);
 	bl_pipe_msg.bl_wq = &nn->bl_wq;
 
 	b->simple.len += 4;	/* single volume */
 	if (b->simple.len > PAGE_SIZE)
-		return -EIO;
+		goto out_unlock;
 
 	memset(msg, 0, sizeof(*msg));
 	msg->len = sizeof(*bl_msg) + b->simple.len;
 	msg->data = kzalloc(msg->len, gfp_mask);
 	if (!msg->data)
-		goto out;
+		goto out_free_data;
 
 	bl_msg = msg->data;
 	bl_msg->type = BL_DEVICE_MOUNT,
@@ -87,7 +88,7 @@ bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b,
 	rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
 	if (rc < 0) {
 		remove_wait_queue(&nn->bl_wq, &wq);
-		goto out;
+		goto out_free_data;
 	}
 
 	set_current_state(TASK_UNINTERRUPTIBLE);
@@ -97,12 +98,14 @@ bl_resolve_deviceid(struct nfs_server *server, struct pnfs_block_volume *b,
 	if (reply->status != BL_DEVICE_REQUEST_PROC) {
 		printk(KERN_WARNING "%s failed to decode device: %d\n",
 			__func__, reply->status);
-		goto out;
+		goto out_free_data;
 	}
 
 	dev = MKDEV(reply->major, reply->minor);
-out:
+out_free_data:
 	kfree(msg->data);
+out_unlock:
+	mutex_unlock(&nn->bl_mutex);
 	return dev;
 }
 
@@ -232,6 +235,7 @@ static int nfs4blocklayout_net_init(struct net *net)
 	struct nfs_net *nn = net_generic(net, nfs_net_id);
 	struct dentry *dentry;
 
+	mutex_init(&nn->bl_mutex);
 	init_waitqueue_head(&nn->bl_wq);
 	nn->bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
 	if (IS_ERR(nn->bl_device_pipe))
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 5853f53db732..7f3f60641344 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -125,6 +125,8 @@ again:
 			continue;
 		if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 			continue;
+		if (!nfs4_valid_open_stateid(state))
+			continue;
 		if (!nfs4_stateid_match(&state->stateid, stateid))
 			continue;
 		get_nfs_open_context(ctx);
@@ -193,7 +195,11 @@ static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *
 {
 	int res = 0;
 
-	res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync);
+	if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
+		res = nfs4_proc_delegreturn(inode,
+				delegation->cred,
+				&delegation->stateid,
+				issync);
 	nfs_free_delegation(delegation);
 	return res;
 }
@@ -380,11 +386,13 @@ static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation
 {
 	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
 	struct nfs_inode *nfsi = NFS_I(inode);
-	int err;
+	int err = 0;
 
 	if (delegation == NULL)
 		return 0;
 	do {
+		if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
+			break;
 		err = nfs_delegation_claim_opens(inode, &delegation->stateid);
 		if (!issync || err != -EAGAIN)
 			break;
@@ -605,10 +613,23 @@ static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *cl
 	rcu_read_unlock();
 }
 
+static void nfs_revoke_delegation(struct inode *inode)
+{
+	struct nfs_delegation *delegation;
+	rcu_read_lock();
+	delegation = rcu_dereference(NFS_I(inode)->delegation);
+	if (delegation != NULL) {
+		set_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
+		nfs_mark_return_delegation(NFS_SERVER(inode), delegation);
+	}
+	rcu_read_unlock();
+}
+
 void nfs_remove_bad_delegation(struct inode *inode)
 {
 	struct nfs_delegation *delegation;
 
+	nfs_revoke_delegation(inode);
 	delegation = nfs_inode_detach_delegation(inode);
 	if (delegation) {
 		nfs_inode_find_state_and_recover(inode, &delegation->stateid);
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index 5c1cce39297f..e3c20a3ccc93 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -31,6 +31,7 @@ enum {
 	NFS_DELEGATION_RETURN_IF_CLOSED,
 	NFS_DELEGATION_REFERENCED,
 	NFS_DELEGATION_RETURNING,
+	NFS_DELEGATION_REVOKED,
 };
 
 int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 06e8cfcbb670..6e62155abf26 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1527,6 +1527,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 		case -ENOENT:
 			d_drop(dentry);
 			d_add(dentry, NULL);
+			nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 			break;
 		case -EISDIR:
 		case -ENOTDIR:
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 20cffc830468..10bf07280f4a 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -266,6 +266,7 @@ static void nfs_direct_req_free(struct kref *kref)
 {
 	struct nfs_direct_req *dreq = container_of(kref, struct nfs_direct_req, kref);
 
+	nfs_free_pnfs_ds_cinfo(&dreq->ds_cinfo);
 	if (dreq->l_ctx != NULL)
 		nfs_put_lock_context(dreq->l_ctx);
 	if (dreq->ctx != NULL)
diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c
index 46fab1cb455a..7afb52f6a25a 100644
--- a/fs/nfs/filelayout/filelayout.c
+++ b/fs/nfs/filelayout/filelayout.c
@@ -145,9 +145,6 @@ static int filelayout_async_handle_error(struct rpc_task *task,
 	case -NFS4ERR_DELEG_REVOKED:
 	case -NFS4ERR_ADMIN_REVOKED:
 	case -NFS4ERR_BAD_STATEID:
-		if (state == NULL)
-			break;
-		nfs_remove_bad_delegation(state->inode);
 	case -NFS4ERR_OPENMODE:
 		if (state == NULL)
 			break;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 6388a59f2add..00689a8a85e4 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -626,7 +626,7 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 {
 	struct inode *inode = dentry->d_inode;
 	int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
-	int err;
+	int err = 0;
 
 	trace_nfs_getattr_enter(inode);
 	/* Flush out writes to the server in order to update c/mtime.  */
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h
index ef221fb8a183..f0e06e4acbef 100644
--- a/fs/nfs/netns.h
+++ b/fs/nfs/netns.h
@@ -19,6 +19,7 @@ struct nfs_net {
 	struct rpc_pipe *bl_device_pipe;
 	struct bl_dev_msg bl_mount_reply;
 	wait_queue_head_t bl_wq;
+	struct mutex bl_mutex;
 	struct list_head nfs_client_list;
 	struct list_head nfs_volume_list;
 #if IS_ENABLED(CONFIG_NFS_V4)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 405bd95c1f58..69dc20a743f9 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -370,11 +370,6 @@ static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struc
 		case -NFS4ERR_DELEG_REVOKED:
 		case -NFS4ERR_ADMIN_REVOKED:
 		case -NFS4ERR_BAD_STATEID:
-			if (inode != NULL && nfs4_have_delegation(inode, FMODE_READ)) {
-				nfs_remove_bad_delegation(inode);
-				exception->retry = 1;
-				break;
-			}
 			if (state == NULL)
 				break;
 			ret = nfs4_schedule_stateid_recovery(server, state);
@@ -1654,7 +1649,7 @@ static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct
 			nfs_inode_find_state_and_recover(state->inode,
 					stateid);
 			nfs4_schedule_stateid_recovery(server, state);
-			return 0;
+			return -EAGAIN;
 		case -NFS4ERR_DELAY:
 		case -NFS4ERR_GRACE:
 			set_bit(NFS_DELEGATED_STATE, &state->flags);
@@ -2109,46 +2104,60 @@ static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *sta
 	return ret;
 }
 
+static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
+{
+	nfs_remove_bad_delegation(state->inode);
+	write_seqlock(&state->seqlock);
+	nfs4_stateid_copy(&state->stateid, &state->open_stateid);
+	write_sequnlock(&state->seqlock);
+	clear_bit(NFS_DELEGATED_STATE, &state->flags);
+}
+
+static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
+{
+	if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
+		nfs_finish_clear_delegation_stateid(state);
+}
+
+static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	/* NFSv4.0 doesn't allow for delegation recovery on open expire */
+	nfs40_clear_delegation_stateid(state);
+	return nfs4_open_expired(sp, state);
+}
+
 #if defined(CONFIG_NFS_V4_1)
-static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
+static void nfs41_check_delegation_stateid(struct nfs4_state *state)
 {
 	struct nfs_server *server = NFS_SERVER(state->inode);
-	nfs4_stateid *stateid = &state->stateid;
+	nfs4_stateid stateid;
 	struct nfs_delegation *delegation;
-	struct rpc_cred *cred = NULL;
-	int status = -NFS4ERR_BAD_STATEID;
-
-	/* If a state reset has been done, test_stateid is unneeded */
-	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
-		return;
+	struct rpc_cred *cred;
+	int status;
 
 	/* Get the delegation credential for use by test/free_stateid */
 	rcu_read_lock();
 	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
-	if (delegation != NULL &&
-	    nfs4_stateid_match(&delegation->stateid, stateid)) {
-		cred = get_rpccred(delegation->cred);
-		rcu_read_unlock();
-		status = nfs41_test_stateid(server, stateid, cred);
-		trace_nfs4_test_delegation_stateid(state, NULL, status);
-	} else
+	if (delegation == NULL) {
 		rcu_read_unlock();
+		return;
+	}
+
+	nfs4_stateid_copy(&stateid, &delegation->stateid);
+	cred = get_rpccred(delegation->cred);
+	rcu_read_unlock();
+	status = nfs41_test_stateid(server, &stateid, cred);
+	trace_nfs4_test_delegation_stateid(state, NULL, status);
 
 	if (status != NFS_OK) {
 		/* Free the stateid unless the server explicitly
 		 * informs us the stateid is unrecognized. */
 		if (status != -NFS4ERR_BAD_STATEID)
-			nfs41_free_stateid(server, stateid, cred);
-		nfs_remove_bad_delegation(state->inode);
-
-		write_seqlock(&state->seqlock);
-		nfs4_stateid_copy(&state->stateid, &state->open_stateid);
-		write_sequnlock(&state->seqlock);
-		clear_bit(NFS_DELEGATED_STATE, &state->flags);
+			nfs41_free_stateid(server, &stateid, cred);
+		nfs_finish_clear_delegation_stateid(state);
 	}
 
-	if (cred != NULL)
-		put_rpccred(cred);
+	put_rpccred(cred);
 }
 
 /**
@@ -2192,7 +2201,7 @@ static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *st
 {
 	int status;
 
-	nfs41_clear_delegation_stateid(state);
+	nfs41_check_delegation_stateid(state);
 	status = nfs41_check_open_stateid(state);
 	if (status != NFS_OK)
 		status = nfs4_open_expired(sp, state);
@@ -2231,19 +2240,8 @@ static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
 	seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
 
 	ret = _nfs4_proc_open(opendata);
-	if (ret != 0) {
-		if (ret == -ENOENT) {
-			dentry = opendata->dentry;
-			if (dentry->d_inode)
-				d_delete(dentry);
-			else if (d_unhashed(dentry))
-				d_add(dentry, NULL);
-
-			nfs_set_verifier(dentry,
-					 nfs_save_change_attribute(opendata->dir->d_inode));
-		}
+	if (ret != 0)
 		goto out;
-	}
 
 	state = nfs4_opendata_to_nfs4_state(opendata);
 	ret = PTR_ERR(state);
@@ -4841,9 +4839,6 @@ nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
 		case -NFS4ERR_DELEG_REVOKED:
 		case -NFS4ERR_ADMIN_REVOKED:
 		case -NFS4ERR_BAD_STATEID:
-			if (state == NULL)
-				break;
-			nfs_remove_bad_delegation(state->inode);
 		case -NFS4ERR_OPENMODE:
 			if (state == NULL)
 				break;
@@ -8341,7 +8336,7 @@ static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
 	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
 	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
-	.recover_open	= nfs4_open_expired,
+	.recover_open	= nfs40_open_expired,
 	.recover_lock	= nfs4_lock_expired,
 	.establish_clid = nfs4_init_clientid,
 };
@@ -8408,8 +8403,7 @@ static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
 		| NFS_CAP_CHANGE_ATTR
 		| NFS_CAP_POSIX_LOCK
 		| NFS_CAP_STATEID_NFSV41
-		| NFS_CAP_ATOMIC_OPEN_V1
-		| NFS_CAP_SEEK,
+		| NFS_CAP_ATOMIC_OPEN_V1,
 	.init_client = nfs41_init_client,
 	.shutdown_client = nfs41_shutdown_client,
 	.match_stateid = nfs41_match_stateid,
@@ -8431,7 +8425,8 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
 		| NFS_CAP_CHANGE_ATTR
 		| NFS_CAP_POSIX_LOCK
 		| NFS_CAP_STATEID_NFSV41
-		| NFS_CAP_ATOMIC_OPEN_V1,
+		| NFS_CAP_ATOMIC_OPEN_V1
+		| NFS_CAP_SEEK,
 	.init_client = nfs41_init_client,
 	.shutdown_client = nfs41_shutdown_client,
 	.match_stateid = nfs41_match_stateid,
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
index c6e4bda63000..9e5bc42180e4 100644
--- a/fs/nfs/objlayout/objio_osd.c
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -5,7 +5,7 @@
  *  All rights reserved.
  *
  *  Benny Halevy <bhalevy@panasas.com>
- *  Boaz Harrosh <bharrosh@panasas.com>
+ *  Boaz Harrosh <ooo@electrozaur.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
diff --git a/fs/nfs/objlayout/objlayout.c b/fs/nfs/objlayout/objlayout.c
index c89357c7a914..919efd4a1a23 100644
--- a/fs/nfs/objlayout/objlayout.c
+++ b/fs/nfs/objlayout/objlayout.c
@@ -5,7 +5,7 @@
  *  All rights reserved.
  *
  *  Benny Halevy <bhalevy@panasas.com>
- *  Boaz Harrosh <bharrosh@panasas.com>
+ *  Boaz Harrosh <ooo@electrozaur.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
diff --git a/fs/nfs/objlayout/objlayout.h b/fs/nfs/objlayout/objlayout.h
index 3a0828d57339..2641dbad345c 100644
--- a/fs/nfs/objlayout/objlayout.h
+++ b/fs/nfs/objlayout/objlayout.h
@@ -6,7 +6,7 @@
  *  All rights reserved.
  *
  *  Benny Halevy <bhalevy@panasas.com>
- *  Boaz Harrosh <bharrosh@panasas.com>
+ *  Boaz Harrosh <ooo@electrozaur.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
diff --git a/fs/nfs/objlayout/pnfs_osd_xdr_cli.c b/fs/nfs/objlayout/pnfs_osd_xdr_cli.c
index b3918f7ac34d..f093c7ec983b 100644
--- a/fs/nfs/objlayout/pnfs_osd_xdr_cli.c
+++ b/fs/nfs/objlayout/pnfs_osd_xdr_cli.c
@@ -5,7 +5,7 @@
  *  All rights reserved.
  *
  *  Benny Halevy <bhalevy@panasas.com>
- *  Boaz Harrosh <bharrosh@panasas.com>
+ *  Boaz Harrosh <ooo@electrozaur.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 12493846a2d3..f83b02dc9166 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -715,8 +715,6 @@ static void nfs_inode_remove_request(struct nfs_page *req)
 
 	if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
 		nfs_release_request(req);
-	else
-		WARN_ON_ONCE(1);
 }
 
 static void
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 747f3b95bd11..33a46a8dfaf7 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -335,12 +335,15 @@ void		nfsd_lockd_shutdown(void);
 	(NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
 
 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
-#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
-	(NFSD4_1_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SECURITY_LABEL)
+#define NFSD4_2_SECURITY_ATTRS		FATTR4_WORD2_SECURITY_LABEL
 #else
-#define NFSD4_2_SUPPORTED_ATTRS_WORD2 0
+#define NFSD4_2_SECURITY_ATTRS		0
 #endif
 
+#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
+	(NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
+	NFSD4_2_SECURITY_ATTRS)
+
 static inline u32 nfsd_suppattrs0(u32 minorversion)
 {
 	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 9d3e9c50066a..89326acd4561 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -229,8 +229,16 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
 					      &fsnotify_mark_srcu);
 	}
 
+	/*
+	 * We need to merge inode & vfsmount mark lists so that inode mark
+	 * ignore masks are properly reflected for mount mark notifications.
+	 * That's why this traversal is so complicated...
+	 */
 	while (inode_node || vfsmount_node) {
-		inode_group = vfsmount_group = NULL;
+		inode_group = NULL;
+		inode_mark = NULL;
+		vfsmount_group = NULL;
+		vfsmount_mark = NULL;
 
 		if (inode_node) {
 			inode_mark = hlist_entry(srcu_dereference(inode_node, &fsnotify_mark_srcu),
@@ -244,21 +252,19 @@ int fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is,
 			vfsmount_group = vfsmount_mark->group;
 		}
 
-		if (inode_group > vfsmount_group) {
-			/* handle inode */
-			ret = send_to_group(to_tell, inode_mark, NULL, mask,
-					    data, data_is, cookie, file_name);
-			/* we didn't use the vfsmount_mark */
-			vfsmount_group = NULL;
-		} else if (vfsmount_group > inode_group) {
-			ret = send_to_group(to_tell, NULL, vfsmount_mark, mask,
-					    data, data_is, cookie, file_name);
-			inode_group = NULL;
-		} else {
-			ret = send_to_group(to_tell, inode_mark, vfsmount_mark,
-					    mask, data, data_is, cookie,
-					    file_name);
+		if (inode_group && vfsmount_group) {
+			int cmp = fsnotify_compare_groups(inode_group,
+							  vfsmount_group);
+			if (cmp > 0) {
+				inode_group = NULL;
+				inode_mark = NULL;
+			} else if (cmp < 0) {
+				vfsmount_group = NULL;
+				vfsmount_mark = NULL;
+			}
 		}
+		ret = send_to_group(to_tell, inode_mark, vfsmount_mark, mask,
+				    data, data_is, cookie, file_name);
 
 		if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
 			goto out;
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index 9c0898c4cfe1..3b68b0ae0a97 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -12,6 +12,10 @@ extern void fsnotify_flush_notify(struct fsnotify_group *group);
 /* protects reads of inode and vfsmount marks list */
 extern struct srcu_struct fsnotify_mark_srcu;
 
+/* compare two groups for sorting of marks lists */
+extern int fsnotify_compare_groups(struct fsnotify_group *a,
+				   struct fsnotify_group *b);
+
 extern void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *fsn_mark,
 						__u32 mask);
 /* add a mark to an inode */
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index 9ce062218de9..dfbf5447eea4 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -194,6 +194,7 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
 {
 	struct fsnotify_mark *lmark, *last = NULL;
 	int ret = 0;
+	int cmp;
 
 	mark->flags |= FSNOTIFY_MARK_FLAG_INODE;
 
@@ -219,11 +220,8 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
 			goto out;
 		}
 
-		if (mark->group->priority < lmark->group->priority)
-			continue;
-
-		if ((mark->group->priority == lmark->group->priority) &&
-		    (mark->group < lmark->group))
+		cmp = fsnotify_compare_groups(lmark->group, mark->group);
+		if (cmp < 0)
 			continue;
 
 		hlist_add_before_rcu(&mark->i.i_list, &lmark->i.i_list);
@@ -288,20 +286,25 @@ void fsnotify_unmount_inodes(struct list_head *list)
 		spin_unlock(&inode->i_lock);
 
 		/* In case the dropping of a reference would nuke next_i. */
-		if ((&next_i->i_sb_list != list) &&
-		    atomic_read(&next_i->i_count)) {
+		while (&next_i->i_sb_list != list) {
 			spin_lock(&next_i->i_lock);
-			if (!(next_i->i_state & (I_FREEING | I_WILL_FREE))) {
+			if (!(next_i->i_state & (I_FREEING | I_WILL_FREE)) &&
+						atomic_read(&next_i->i_count)) {
 				__iget(next_i);
 				need_iput = next_i;
+				spin_unlock(&next_i->i_lock);
+				break;
 			}
 			spin_unlock(&next_i->i_lock);
+			next_i = list_entry(next_i->i_sb_list.next,
+						struct inode, i_sb_list);
 		}
 
 		/*
-		 * We can safely drop inode_sb_list_lock here because we hold
-		 * references on both inode and next_i.  Also no new inodes
-		 * will be added since the umount has begun.
+		 * We can safely drop inode_sb_list_lock here because either
+		 * we actually hold references on both inode and next_i or
+		 * end of list.  Also no new inodes will be added since the
+		 * umount has begun.
 		 */
 		spin_unlock(&inode_sb_list_lock);
 
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index d90deaa08e78..34c38fabf514 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -210,6 +210,42 @@ void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mas
 }
 
 /*
+ * Sorting function for lists of fsnotify marks.
+ *
+ * Fanotify supports different notification classes (reflected as priority of
+ * notification group). Events shall be passed to notification groups in
+ * decreasing priority order. To achieve this marks in notification lists for
+ * inodes and vfsmounts are sorted so that priorities of corresponding groups
+ * are descending.
+ *
+ * Furthermore correct handling of the ignore mask requires processing inode
+ * and vfsmount marks of each group together. Using the group address as
+ * further sort criterion provides a unique sorting order and thus we can
+ * merge inode and vfsmount lists of marks in linear time and find groups
+ * present in both lists.
+ *
+ * A return value of 1 signifies that b has priority over a.
+ * A return value of 0 signifies that the two marks have to be handled together.
+ * A return value of -1 signifies that a has priority over b.
+ */
+int fsnotify_compare_groups(struct fsnotify_group *a, struct fsnotify_group *b)
+{
+	if (a == b)
+		return 0;
+	if (!a)
+		return 1;
+	if (!b)
+		return -1;
+	if (a->priority < b->priority)
+		return 1;
+	if (a->priority > b->priority)
+		return -1;
+	if (a < b)
+		return 1;
+	return -1;
+}
+
+/*
  * Attach an initialized mark to a given group and fs object.
  * These marks may be used for the fsnotify backend to determine which
  * event types should be delivered to which group.
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
index ac851e8376b1..faefa72a11eb 100644
--- a/fs/notify/vfsmount_mark.c
+++ b/fs/notify/vfsmount_mark.c
@@ -153,6 +153,7 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
 	struct mount *m = real_mount(mnt);
 	struct fsnotify_mark *lmark, *last = NULL;
 	int ret = 0;
+	int cmp;
 
 	mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
 
@@ -178,11 +179,8 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
 			goto out;
 		}
 
-		if (mark->group->priority < lmark->group->priority)
-			continue;
-
-		if ((mark->group->priority == lmark->group->priority) &&
-		    (mark->group < lmark->group))
+		cmp = fsnotify_compare_groups(lmark->group, mark->group);
+		if (cmp < 0)
 			continue;
 
 		hlist_add_before_rcu(&mark->m.m_list, &lmark->m.m_list);
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 97de0fbd9f78..a96044004064 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -925,7 +925,7 @@ static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
 			      size_t veclen, size_t total)
 {
 	int ret;
-	struct msghdr msg;
+	struct msghdr msg = {.msg_flags = 0,};
 
 	if (sock == NULL) {
 		ret = -EINVAL;
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 8add6f1030d7..b931e04e3388 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -158,7 +158,7 @@ bail_add:
 		 * NOTE: This dentry already has ->d_op set from
 		 * ocfs2_get_parent() and ocfs2_get_dentry()
 		 */
-		if (ret)
+		if (!IS_ERR_OR_NULL(ret))
 			dentry = ret;
 
 		status = ocfs2_dentry_attach_lock(dentry, inode,
diff --git a/fs/open.c b/fs/open.c
index c94449b2e582..192c429f1fbc 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -824,8 +824,7 @@ struct file *dentry_open(const struct path *path, int flags,
 	f = get_empty_filp();
 	if (!IS_ERR(f)) {
 		f->f_flags = flags;
-		f->f_path = *path;
-		error = do_dentry_open(f, NULL, cred);
+		error = vfs_open(path, f, cred);
 		if (!error) {
 			/* from now on we need fput() to dispose of f */
 			error = open_check_o_direct(f);
@@ -842,6 +841,26 @@ struct file *dentry_open(const struct path *path, int flags,
 }
 EXPORT_SYMBOL(dentry_open);
 
+/**
+ * vfs_open - open the file at the given path
+ * @path: path to open
+ * @filp: newly allocated file with f_flag initialized
+ * @cred: credentials to use
+ */
+int vfs_open(const struct path *path, struct file *filp,
+	     const struct cred *cred)
+{
+	struct inode *inode = path->dentry->d_inode;
+
+	if (inode->i_op->dentry_open)
+		return inode->i_op->dentry_open(path->dentry, filp, cred);
+	else {
+		filp->f_path = *path;
+		return do_dentry_open(filp, NULL, cred);
+	}
+}
+EXPORT_SYMBOL(vfs_open);
+
 static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
 {
 	int lookup_flags = 0;
diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig
new file mode 100644
index 000000000000..e60125976873
--- /dev/null
+++ b/fs/overlayfs/Kconfig
@@ -0,0 +1,10 @@
+config OVERLAYFS_FS
+	tristate "Overlay filesystem support"
+	help
+	  An overlay filesystem combines two filesystems - an 'upper' filesystem
+	  and a 'lower' filesystem.  When a name exists in both filesystems, the
+	  object in the 'upper' filesystem is visible while the object in the
+	  'lower' filesystem is either hidden or, in the case of directories,
+	  merged with the 'upper' object.
+
+	  For more information see Documentation/filesystems/overlayfs.txt
diff --git a/fs/overlayfs/Makefile b/fs/overlayfs/Makefile
new file mode 100644
index 000000000000..8f91889480d0
--- /dev/null
+++ b/fs/overlayfs/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the overlay filesystem.
+#
+
+obj-$(CONFIG_OVERLAYFS_FS) += overlayfs.o
+
+overlayfs-objs := super.o inode.o dir.o readdir.o copy_up.o
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
new file mode 100644
index 000000000000..ea10a8719107
--- /dev/null
+++ b/fs/overlayfs/copy_up.c
@@ -0,0 +1,414 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/splice.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/uaccess.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+#include "overlayfs.h"
+
+#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
+
+int ovl_copy_xattr(struct dentry *old, struct dentry *new)
+{
+	ssize_t list_size, size;
+	char *buf, *name, *value;
+	int error;
+
+	if (!old->d_inode->i_op->getxattr ||
+	    !new->d_inode->i_op->getxattr)
+		return 0;
+
+	list_size = vfs_listxattr(old, NULL, 0);
+	if (list_size <= 0) {
+		if (list_size == -EOPNOTSUPP)
+			return 0;
+		return list_size;
+	}
+
+	buf = kzalloc(list_size, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	error = -ENOMEM;
+	value = kmalloc(XATTR_SIZE_MAX, GFP_KERNEL);
+	if (!value)
+		goto out;
+
+	list_size = vfs_listxattr(old, buf, list_size);
+	if (list_size <= 0) {
+		error = list_size;
+		goto out_free_value;
+	}
+
+	for (name = buf; name < (buf + list_size); name += strlen(name) + 1) {
+		size = vfs_getxattr(old, name, value, XATTR_SIZE_MAX);
+		if (size <= 0) {
+			error = size;
+			goto out_free_value;
+		}
+		error = vfs_setxattr(new, name, value, size, 0);
+		if (error)
+			goto out_free_value;
+	}
+
+out_free_value:
+	kfree(value);
+out:
+	kfree(buf);
+	return error;
+}
+
+static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
+{
+	struct file *old_file;
+	struct file *new_file;
+	loff_t old_pos = 0;
+	loff_t new_pos = 0;
+	int error = 0;
+
+	if (len == 0)
+		return 0;
+
+	old_file = ovl_path_open(old, O_RDONLY);
+	if (IS_ERR(old_file))
+		return PTR_ERR(old_file);
+
+	new_file = ovl_path_open(new, O_WRONLY);
+	if (IS_ERR(new_file)) {
+		error = PTR_ERR(new_file);
+		goto out_fput;
+	}
+
+	/* FIXME: copy up sparse files efficiently */
+	while (len) {
+		size_t this_len = OVL_COPY_UP_CHUNK_SIZE;
+		long bytes;
+
+		if (len < this_len)
+			this_len = len;
+
+		if (signal_pending_state(TASK_KILLABLE, current)) {
+			error = -EINTR;
+			break;
+		}
+
+		bytes = do_splice_direct(old_file, &old_pos,
+					 new_file, &new_pos,
+					 this_len, SPLICE_F_MOVE);
+		if (bytes <= 0) {
+			error = bytes;
+			break;
+		}
+		WARN_ON(old_pos != new_pos);
+
+		len -= bytes;
+	}
+
+	fput(new_file);
+out_fput:
+	fput(old_file);
+	return error;
+}
+
+static char *ovl_read_symlink(struct dentry *realdentry)
+{
+	int res;
+	char *buf;
+	struct inode *inode = realdentry->d_inode;
+	mm_segment_t old_fs;
+
+	res = -EINVAL;
+	if (!inode->i_op->readlink)
+		goto err;
+
+	res = -ENOMEM;
+	buf = (char *) __get_free_page(GFP_KERNEL);
+	if (!buf)
+		goto err;
+
+	old_fs = get_fs();
+	set_fs(get_ds());
+	/* The cast to a user pointer is valid due to the set_fs() */
+	res = inode->i_op->readlink(realdentry,
+				    (char __user *)buf, PAGE_SIZE - 1);
+	set_fs(old_fs);
+	if (res < 0) {
+		free_page((unsigned long) buf);
+		goto err;
+	}
+	buf[res] = '\0';
+
+	return buf;
+
+err:
+	return ERR_PTR(res);
+}
+
+static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
+{
+	struct iattr attr = {
+		.ia_valid =
+		     ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET,
+		.ia_atime = stat->atime,
+		.ia_mtime = stat->mtime,
+	};
+
+	return notify_change(upperdentry, &attr, NULL);
+}
+
+int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
+{
+	int err = 0;
+
+	if (!S_ISLNK(stat->mode)) {
+		struct iattr attr = {
+			.ia_valid = ATTR_MODE,
+			.ia_mode = stat->mode,
+		};
+		err = notify_change(upperdentry, &attr, NULL);
+	}
+	if (!err) {
+		struct iattr attr = {
+			.ia_valid = ATTR_UID | ATTR_GID,
+			.ia_uid = stat->uid,
+			.ia_gid = stat->gid,
+		};
+		err = notify_change(upperdentry, &attr, NULL);
+	}
+	if (!err)
+		ovl_set_timestamps(upperdentry, stat);
+
+	return err;
+
+}
+
+static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
+			      struct dentry *dentry, struct path *lowerpath,
+			      struct kstat *stat, struct iattr *attr,
+			      const char *link)
+{
+	struct inode *wdir = workdir->d_inode;
+	struct inode *udir = upperdir->d_inode;
+	struct dentry *newdentry = NULL;
+	struct dentry *upper = NULL;
+	umode_t mode = stat->mode;
+	int err;
+
+	newdentry = ovl_lookup_temp(workdir, dentry);
+	err = PTR_ERR(newdentry);
+	if (IS_ERR(newdentry))
+		goto out;
+
+	upper = lookup_one_len(dentry->d_name.name, upperdir,
+			       dentry->d_name.len);
+	err = PTR_ERR(upper);
+	if (IS_ERR(upper))
+		goto out1;
+
+	/* Can't properly set mode on creation because of the umask */
+	stat->mode &= S_IFMT;
+	err = ovl_create_real(wdir, newdentry, stat, link, NULL, true);
+	stat->mode = mode;
+	if (err)
+		goto out2;
+
+	if (S_ISREG(stat->mode)) {
+		struct path upperpath;
+		ovl_path_upper(dentry, &upperpath);
+		BUG_ON(upperpath.dentry != NULL);
+		upperpath.dentry = newdentry;
+
+		err = ovl_copy_up_data(lowerpath, &upperpath, stat->size);
+		if (err)
+			goto out_cleanup;
+	}
+
+	err = ovl_copy_xattr(lowerpath->dentry, newdentry);
+	if (err)
+		goto out_cleanup;
+
+	mutex_lock(&newdentry->d_inode->i_mutex);
+	err = ovl_set_attr(newdentry, stat);
+	if (!err && attr)
+		err = notify_change(newdentry, attr, NULL);
+	mutex_unlock(&newdentry->d_inode->i_mutex);
+	if (err)
+		goto out_cleanup;
+
+	err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
+	if (err)
+		goto out_cleanup;
+
+	ovl_dentry_update(dentry, newdentry);
+	newdentry = NULL;
+
+	/*
+	 * Non-directores become opaque when copied up.
+	 */
+	if (!S_ISDIR(stat->mode))
+		ovl_dentry_set_opaque(dentry, true);
+out2:
+	dput(upper);
+out1:
+	dput(newdentry);
+out:
+	return err;
+
+out_cleanup:
+	ovl_cleanup(wdir, newdentry);
+	goto out;
+}
+
+/*
+ * Copy up a single dentry
+ *
+ * Directory renames only allowed on "pure upper" (already created on
+ * upper filesystem, never copied up).  Directories which are on lower or
+ * are merged may not be renamed.  For these -EXDEV is returned and
+ * userspace has to deal with it.  This means, when copying up a
+ * directory we can rely on it and ancestors being stable.
+ *
+ * Non-directory renames start with copy up of source if necessary.  The
+ * actual rename will only proceed once the copy up was successful.  Copy
+ * up uses upper parent i_mutex for exclusion.  Since rename can change
+ * d_parent it is possible that the copy up will lock the old parent.  At
+ * that point the file will have already been copied up anyway.
+ */
+int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
+		    struct path *lowerpath, struct kstat *stat,
+		    struct iattr *attr)
+{
+	struct dentry *workdir = ovl_workdir(dentry);
+	int err;
+	struct kstat pstat;
+	struct path parentpath;
+	struct dentry *upperdir;
+	struct dentry *upperdentry;
+	const struct cred *old_cred;
+	struct cred *override_cred;
+	char *link = NULL;
+
+	ovl_path_upper(parent, &parentpath);
+	upperdir = parentpath.dentry;
+
+	err = vfs_getattr(&parentpath, &pstat);
+	if (err)
+		return err;
+
+	if (S_ISLNK(stat->mode)) {
+		link = ovl_read_symlink(lowerpath->dentry);
+		if (IS_ERR(link))
+			return PTR_ERR(link);
+	}
+
+	err = -ENOMEM;
+	override_cred = prepare_creds();
+	if (!override_cred)
+		goto out_free_link;
+
+	override_cred->fsuid = stat->uid;
+	override_cred->fsgid = stat->gid;
+	/*
+	 * CAP_SYS_ADMIN for copying up extended attributes
+	 * CAP_DAC_OVERRIDE for create
+	 * CAP_FOWNER for chmod, timestamp update
+	 * CAP_FSETID for chmod
+	 * CAP_CHOWN for chown
+	 * CAP_MKNOD for mknod
+	 */
+	cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+	cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+	cap_raise(override_cred->cap_effective, CAP_FOWNER);
+	cap_raise(override_cred->cap_effective, CAP_FSETID);
+	cap_raise(override_cred->cap_effective, CAP_CHOWN);
+	cap_raise(override_cred->cap_effective, CAP_MKNOD);
+	old_cred = override_creds(override_cred);
+
+	err = -EIO;
+	if (lock_rename(workdir, upperdir) != NULL) {
+		pr_err("overlayfs: failed to lock workdir+upperdir\n");
+		goto out_unlock;
+	}
+	upperdentry = ovl_dentry_upper(dentry);
+	if (upperdentry) {
+		unlock_rename(workdir, upperdir);
+		err = 0;
+		/* Raced with another copy-up?  Do the setattr here */
+		if (attr) {
+			mutex_lock(&upperdentry->d_inode->i_mutex);
+			err = notify_change(upperdentry, attr, NULL);
+			mutex_unlock(&upperdentry->d_inode->i_mutex);
+		}
+		goto out_put_cred;
+	}
+
+	err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
+				 stat, attr, link);
+	if (!err) {
+		/* Restore timestamps on parent (best effort) */
+		ovl_set_timestamps(upperdir, &pstat);
+	}
+out_unlock:
+	unlock_rename(workdir, upperdir);
+out_put_cred:
+	revert_creds(old_cred);
+	put_cred(override_cred);
+
+out_free_link:
+	if (link)
+		free_page((unsigned long) link);
+
+	return err;
+}
+
+int ovl_copy_up(struct dentry *dentry)
+{
+	int err;
+
+	err = 0;
+	while (!err) {
+		struct dentry *next;
+		struct dentry *parent;
+		struct path lowerpath;
+		struct kstat stat;
+		enum ovl_path_type type = ovl_path_type(dentry);
+
+		if (type != OVL_PATH_LOWER)
+			break;
+
+		next = dget(dentry);
+		/* find the topmost dentry not yet copied up */
+		for (;;) {
+			parent = dget_parent(next);
+
+			type = ovl_path_type(parent);
+			if (type != OVL_PATH_LOWER)
+				break;
+
+			dput(next);
+			next = parent;
+		}
+
+		ovl_path_lower(next, &lowerpath);
+		err = vfs_getattr(&lowerpath, &stat);
+		if (!err)
+			err = ovl_copy_up_one(parent, next, &lowerpath, &stat, NULL);
+
+		dput(parent);
+		dput(next);
+	}
+
+	return err;
+}
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
new file mode 100644
index 000000000000..15cd91ad9940
--- /dev/null
+++ b/fs/overlayfs/dir.c
@@ -0,0 +1,921 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/cred.h>
+#include "overlayfs.h"
+
+void ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
+{
+	int err;
+
+	dget(wdentry);
+	if (S_ISDIR(wdentry->d_inode->i_mode))
+		err = ovl_do_rmdir(wdir, wdentry);
+	else
+		err = ovl_do_unlink(wdir, wdentry);
+	dput(wdentry);
+
+	if (err) {
+		pr_err("overlayfs: cleanup of '%pd2' failed (%i)\n",
+		       wdentry, err);
+	}
+}
+
+struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry)
+{
+	struct dentry *temp;
+	char name[20];
+
+	snprintf(name, sizeof(name), "#%lx", (unsigned long) dentry);
+
+	temp = lookup_one_len(name, workdir, strlen(name));
+	if (!IS_ERR(temp) && temp->d_inode) {
+		pr_err("overlayfs: workdir/%s already exists\n", name);
+		dput(temp);
+		temp = ERR_PTR(-EIO);
+	}
+
+	return temp;
+}
+
+/* caller holds i_mutex on workdir */
+static struct dentry *ovl_whiteout(struct dentry *workdir,
+				   struct dentry *dentry)
+{
+	int err;
+	struct dentry *whiteout;
+	struct inode *wdir = workdir->d_inode;
+
+	whiteout = ovl_lookup_temp(workdir, dentry);
+	if (IS_ERR(whiteout))
+		return whiteout;
+
+	err = ovl_do_whiteout(wdir, whiteout);
+	if (err) {
+		dput(whiteout);
+		whiteout = ERR_PTR(err);
+	}
+
+	return whiteout;
+}
+
+int ovl_create_real(struct inode *dir, struct dentry *newdentry,
+		    struct kstat *stat, const char *link,
+		    struct dentry *hardlink, bool debug)
+{
+	int err;
+
+	if (newdentry->d_inode)
+		return -ESTALE;
+
+	if (hardlink) {
+		err = ovl_do_link(hardlink, dir, newdentry, debug);
+	} else {
+		switch (stat->mode & S_IFMT) {
+		case S_IFREG:
+			err = ovl_do_create(dir, newdentry, stat->mode, debug);
+			break;
+
+		case S_IFDIR:
+			err = ovl_do_mkdir(dir, newdentry, stat->mode, debug);
+			break;
+
+		case S_IFCHR:
+		case S_IFBLK:
+		case S_IFIFO:
+		case S_IFSOCK:
+			err = ovl_do_mknod(dir, newdentry,
+					   stat->mode, stat->rdev, debug);
+			break;
+
+		case S_IFLNK:
+			err = ovl_do_symlink(dir, newdentry, link, debug);
+			break;
+
+		default:
+			err = -EPERM;
+		}
+	}
+	if (!err && WARN_ON(!newdentry->d_inode)) {
+		/*
+		 * Not quite sure if non-instantiated dentry is legal or not.
+		 * VFS doesn't seem to care so check and warn here.
+		 */
+		err = -ENOENT;
+	}
+	return err;
+}
+
+static int ovl_set_opaque(struct dentry *upperdentry)
+{
+	return ovl_do_setxattr(upperdentry, ovl_opaque_xattr, "y", 1, 0);
+}
+
+static void ovl_remove_opaque(struct dentry *upperdentry)
+{
+	int err;
+
+	err = ovl_do_removexattr(upperdentry, ovl_opaque_xattr);
+	if (err) {
+		pr_warn("overlayfs: failed to remove opaque from '%s' (%i)\n",
+			upperdentry->d_name.name, err);
+	}
+}
+
+static int ovl_dir_getattr(struct vfsmount *mnt, struct dentry *dentry,
+			 struct kstat *stat)
+{
+	int err;
+	enum ovl_path_type type;
+	struct path realpath;
+
+	type = ovl_path_real(dentry, &realpath);
+	err = vfs_getattr(&realpath, stat);
+	if (err)
+		return err;
+
+	stat->dev = dentry->d_sb->s_dev;
+	stat->ino = dentry->d_inode->i_ino;
+
+	/*
+	 * It's probably not worth it to count subdirs to get the
+	 * correct link count.  nlink=1 seems to pacify 'find' and
+	 * other utilities.
+	 */
+	if (type == OVL_PATH_MERGE)
+		stat->nlink = 1;
+
+	return 0;
+}
+
+static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
+			    struct kstat *stat, const char *link,
+			    struct dentry *hardlink)
+{
+	struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+	struct inode *udir = upperdir->d_inode;
+	struct dentry *newdentry;
+	int err;
+
+	mutex_lock_nested(&udir->i_mutex, I_MUTEX_PARENT);
+	newdentry = lookup_one_len(dentry->d_name.name, upperdir,
+				   dentry->d_name.len);
+	err = PTR_ERR(newdentry);
+	if (IS_ERR(newdentry))
+		goto out_unlock;
+	err = ovl_create_real(udir, newdentry, stat, link, hardlink, false);
+	if (err)
+		goto out_dput;
+
+	ovl_dentry_version_inc(dentry->d_parent);
+	ovl_dentry_update(dentry, newdentry);
+	ovl_copyattr(newdentry->d_inode, inode);
+	d_instantiate(dentry, inode);
+	newdentry = NULL;
+out_dput:
+	dput(newdentry);
+out_unlock:
+	mutex_unlock(&udir->i_mutex);
+	return err;
+}
+
+static int ovl_lock_rename_workdir(struct dentry *workdir,
+				   struct dentry *upperdir)
+{
+	/* Workdir should not be the same as upperdir */
+	if (workdir == upperdir)
+		goto err;
+
+	/* Workdir should not be subdir of upperdir and vice versa */
+	if (lock_rename(workdir, upperdir) != NULL)
+		goto err_unlock;
+
+	return 0;
+
+err_unlock:
+	unlock_rename(workdir, upperdir);
+err:
+	pr_err("overlayfs: failed to lock workdir+upperdir\n");
+	return -EIO;
+}
+
+static struct dentry *ovl_clear_empty(struct dentry *dentry,
+				      struct list_head *list)
+{
+	struct dentry *workdir = ovl_workdir(dentry);
+	struct inode *wdir = workdir->d_inode;
+	struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+	struct inode *udir = upperdir->d_inode;
+	struct path upperpath;
+	struct dentry *upper;
+	struct dentry *opaquedir;
+	struct kstat stat;
+	int err;
+
+	err = ovl_lock_rename_workdir(workdir, upperdir);
+	if (err)
+		goto out;
+
+	ovl_path_upper(dentry, &upperpath);
+	err = vfs_getattr(&upperpath, &stat);
+	if (err)
+		goto out_unlock;
+
+	err = -ESTALE;
+	if (!S_ISDIR(stat.mode))
+		goto out_unlock;
+	upper = upperpath.dentry;
+	if (upper->d_parent->d_inode != udir)
+		goto out_unlock;
+
+	opaquedir = ovl_lookup_temp(workdir, dentry);
+	err = PTR_ERR(opaquedir);
+	if (IS_ERR(opaquedir))
+		goto out_unlock;
+
+	err = ovl_create_real(wdir, opaquedir, &stat, NULL, NULL, true);
+	if (err)
+		goto out_dput;
+
+	err = ovl_copy_xattr(upper, opaquedir);
+	if (err)
+		goto out_cleanup;
+
+	err = ovl_set_opaque(opaquedir);
+	if (err)
+		goto out_cleanup;
+
+	mutex_lock(&opaquedir->d_inode->i_mutex);
+	err = ovl_set_attr(opaquedir, &stat);
+	mutex_unlock(&opaquedir->d_inode->i_mutex);
+	if (err)
+		goto out_cleanup;
+
+	err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
+	if (err)
+		goto out_cleanup;
+
+	ovl_cleanup_whiteouts(upper, list);
+	ovl_cleanup(wdir, upper);
+	unlock_rename(workdir, upperdir);
+
+	/* dentry's upper doesn't match now, get rid of it */
+	d_drop(dentry);
+
+	return opaquedir;
+
+out_cleanup:
+	ovl_cleanup(wdir, opaquedir);
+out_dput:
+	dput(opaquedir);
+out_unlock:
+	unlock_rename(workdir, upperdir);
+out:
+	return ERR_PTR(err);
+}
+
+static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry,
+						enum ovl_path_type type)
+{
+	int err;
+	struct dentry *ret = NULL;
+	LIST_HEAD(list);
+
+	err = ovl_check_empty_dir(dentry, &list);
+	if (err)
+		ret = ERR_PTR(err);
+	else if (type == OVL_PATH_MERGE)
+		ret = ovl_clear_empty(dentry, &list);
+
+	ovl_cache_free(&list);
+
+	return ret;
+}
+
+static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
+				    struct kstat *stat, const char *link,
+				    struct dentry *hardlink)
+{
+	struct dentry *workdir = ovl_workdir(dentry);
+	struct inode *wdir = workdir->d_inode;
+	struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+	struct inode *udir = upperdir->d_inode;
+	struct dentry *upper;
+	struct dentry *newdentry;
+	int err;
+
+	err = ovl_lock_rename_workdir(workdir, upperdir);
+	if (err)
+		goto out;
+
+	newdentry = ovl_lookup_temp(workdir, dentry);
+	err = PTR_ERR(newdentry);
+	if (IS_ERR(newdentry))
+		goto out_unlock;
+
+	upper = lookup_one_len(dentry->d_name.name, upperdir,
+			       dentry->d_name.len);
+	err = PTR_ERR(upper);
+	if (IS_ERR(upper))
+		goto out_dput;
+
+	err = ovl_create_real(wdir, newdentry, stat, link, hardlink, true);
+	if (err)
+		goto out_dput2;
+
+	if (S_ISDIR(stat->mode)) {
+		err = ovl_set_opaque(newdentry);
+		if (err)
+			goto out_cleanup;
+
+		err = ovl_do_rename(wdir, newdentry, udir, upper,
+				    RENAME_EXCHANGE);
+		if (err)
+			goto out_cleanup;
+
+		ovl_cleanup(wdir, upper);
+	} else {
+		err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
+		if (err)
+			goto out_cleanup;
+	}
+	ovl_dentry_version_inc(dentry->d_parent);
+	ovl_dentry_update(dentry, newdentry);
+	ovl_copyattr(newdentry->d_inode, inode);
+	d_instantiate(dentry, inode);
+	newdentry = NULL;
+out_dput2:
+	dput(upper);
+out_dput:
+	dput(newdentry);
+out_unlock:
+	unlock_rename(workdir, upperdir);
+out:
+	return err;
+
+out_cleanup:
+	ovl_cleanup(wdir, newdentry);
+	goto out_dput2;
+}
+
+static int ovl_create_or_link(struct dentry *dentry, int mode, dev_t rdev,
+			      const char *link, struct dentry *hardlink)
+{
+	int err;
+	struct inode *inode;
+	struct kstat stat = {
+		.mode = mode,
+		.rdev = rdev,
+	};
+
+	err = -ENOMEM;
+	inode = ovl_new_inode(dentry->d_sb, mode, dentry->d_fsdata);
+	if (!inode)
+		goto out;
+
+	err = ovl_copy_up(dentry->d_parent);
+	if (err)
+		goto out_iput;
+
+	if (!ovl_dentry_is_opaque(dentry)) {
+		err = ovl_create_upper(dentry, inode, &stat, link, hardlink);
+	} else {
+		const struct cred *old_cred;
+		struct cred *override_cred;
+
+		err = -ENOMEM;
+		override_cred = prepare_creds();
+		if (!override_cred)
+			goto out_iput;
+
+		/*
+		 * CAP_SYS_ADMIN for setting opaque xattr
+		 * CAP_DAC_OVERRIDE for create in workdir, rename
+		 * CAP_FOWNER for removing whiteout from sticky dir
+		 */
+		cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+		cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+		cap_raise(override_cred->cap_effective, CAP_FOWNER);
+		old_cred = override_creds(override_cred);
+
+		err = ovl_create_over_whiteout(dentry, inode, &stat, link,
+					       hardlink);
+
+		revert_creds(old_cred);
+		put_cred(override_cred);
+	}
+
+	if (!err)
+		inode = NULL;
+out_iput:
+	iput(inode);
+out:
+	return err;
+}
+
+static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
+			     const char *link)
+{
+	int err;
+
+	err = ovl_want_write(dentry);
+	if (!err) {
+		err = ovl_create_or_link(dentry, mode, rdev, link, NULL);
+		ovl_drop_write(dentry);
+	}
+
+	return err;
+}
+
+static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+		      bool excl)
+{
+	return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
+}
+
+static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+	return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
+}
+
+static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
+		     dev_t rdev)
+{
+	/* Don't allow creation of "whiteout" on overlay */
+	if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
+		return -EPERM;
+
+	return ovl_create_object(dentry, mode, rdev, NULL);
+}
+
+static int ovl_symlink(struct inode *dir, struct dentry *dentry,
+		       const char *link)
+{
+	return ovl_create_object(dentry, S_IFLNK, 0, link);
+}
+
+static int ovl_link(struct dentry *old, struct inode *newdir,
+		    struct dentry *new)
+{
+	int err;
+	struct dentry *upper;
+
+	err = ovl_want_write(old);
+	if (err)
+		goto out;
+
+	err = ovl_copy_up(old);
+	if (err)
+		goto out_drop_write;
+
+	upper = ovl_dentry_upper(old);
+	err = ovl_create_or_link(new, upper->d_inode->i_mode, 0, NULL, upper);
+
+out_drop_write:
+	ovl_drop_write(old);
+out:
+	return err;
+}
+
+static int ovl_remove_and_whiteout(struct dentry *dentry,
+				   enum ovl_path_type type, bool is_dir)
+{
+	struct dentry *workdir = ovl_workdir(dentry);
+	struct inode *wdir = workdir->d_inode;
+	struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+	struct inode *udir = upperdir->d_inode;
+	struct dentry *whiteout;
+	struct dentry *upper;
+	struct dentry *opaquedir = NULL;
+	int err;
+
+	if (is_dir) {
+		opaquedir = ovl_check_empty_and_clear(dentry, type);
+		err = PTR_ERR(opaquedir);
+		if (IS_ERR(opaquedir))
+			goto out;
+	}
+
+	err = ovl_lock_rename_workdir(workdir, upperdir);
+	if (err)
+		goto out_dput;
+
+	whiteout = ovl_whiteout(workdir, dentry);
+	err = PTR_ERR(whiteout);
+	if (IS_ERR(whiteout))
+		goto out_unlock;
+
+	if (type == OVL_PATH_LOWER) {
+		upper = lookup_one_len(dentry->d_name.name, upperdir,
+					   dentry->d_name.len);
+		err = PTR_ERR(upper);
+		if (IS_ERR(upper))
+			goto kill_whiteout;
+
+		err = ovl_do_rename(wdir, whiteout, udir, upper, 0);
+		dput(upper);
+		if (err)
+			goto kill_whiteout;
+	} else {
+		int flags = 0;
+
+		upper = ovl_dentry_upper(dentry);
+		if (opaquedir)
+			upper = opaquedir;
+		err = -ESTALE;
+		if (upper->d_parent != upperdir)
+			goto kill_whiteout;
+
+		if (is_dir)
+			flags |= RENAME_EXCHANGE;
+
+		err = ovl_do_rename(wdir, whiteout, udir, upper, flags);
+		if (err)
+			goto kill_whiteout;
+
+		if (is_dir)
+			ovl_cleanup(wdir, upper);
+	}
+	ovl_dentry_version_inc(dentry->d_parent);
+out_d_drop:
+	d_drop(dentry);
+	dput(whiteout);
+out_unlock:
+	unlock_rename(workdir, upperdir);
+out_dput:
+	dput(opaquedir);
+out:
+	return err;
+
+kill_whiteout:
+	ovl_cleanup(wdir, whiteout);
+	goto out_d_drop;
+}
+
+static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
+{
+	struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+	struct inode *dir = upperdir->d_inode;
+	struct dentry *upper = ovl_dentry_upper(dentry);
+	int err;
+
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+	err = -ESTALE;
+	if (upper->d_parent == upperdir) {
+		/* Don't let d_delete() think it can reset d_inode */
+		dget(upper);
+		if (is_dir)
+			err = vfs_rmdir(dir, upper);
+		else
+			err = vfs_unlink(dir, upper, NULL);
+		dput(upper);
+		ovl_dentry_version_inc(dentry->d_parent);
+	}
+
+	/*
+	 * Keeping this dentry hashed would mean having to release
+	 * upperpath/lowerpath, which could only be done if we are the
+	 * sole user of this dentry.  Too tricky...  Just unhash for
+	 * now.
+	 */
+	d_drop(dentry);
+	mutex_unlock(&dir->i_mutex);
+
+	return err;
+}
+
+static inline int ovl_check_sticky(struct dentry *dentry)
+{
+	struct inode *dir = ovl_dentry_real(dentry->d_parent)->d_inode;
+	struct inode *inode = ovl_dentry_real(dentry)->d_inode;
+
+	if (check_sticky(dir, inode))
+		return -EPERM;
+
+	return 0;
+}
+
+static int ovl_do_remove(struct dentry *dentry, bool is_dir)
+{
+	enum ovl_path_type type;
+	int err;
+
+	err = ovl_check_sticky(dentry);
+	if (err)
+		goto out;
+
+	err = ovl_want_write(dentry);
+	if (err)
+		goto out;
+
+	err = ovl_copy_up(dentry->d_parent);
+	if (err)
+		goto out_drop_write;
+
+	type = ovl_path_type(dentry);
+	if (type == OVL_PATH_PURE_UPPER) {
+		err = ovl_remove_upper(dentry, is_dir);
+	} else {
+		const struct cred *old_cred;
+		struct cred *override_cred;
+
+		err = -ENOMEM;
+		override_cred = prepare_creds();
+		if (!override_cred)
+			goto out_drop_write;
+
+		/*
+		 * CAP_SYS_ADMIN for setting xattr on whiteout, opaque dir
+		 * CAP_DAC_OVERRIDE for create in workdir, rename
+		 * CAP_FOWNER for removing whiteout from sticky dir
+		 * CAP_FSETID for chmod of opaque dir
+		 * CAP_CHOWN for chown of opaque dir
+		 */
+		cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+		cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+		cap_raise(override_cred->cap_effective, CAP_FOWNER);
+		cap_raise(override_cred->cap_effective, CAP_FSETID);
+		cap_raise(override_cred->cap_effective, CAP_CHOWN);
+		old_cred = override_creds(override_cred);
+
+		err = ovl_remove_and_whiteout(dentry, type, is_dir);
+
+		revert_creds(old_cred);
+		put_cred(override_cred);
+	}
+out_drop_write:
+	ovl_drop_write(dentry);
+out:
+	return err;
+}
+
+static int ovl_unlink(struct inode *dir, struct dentry *dentry)
+{
+	return ovl_do_remove(dentry, false);
+}
+
+static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	return ovl_do_remove(dentry, true);
+}
+
+static int ovl_rename2(struct inode *olddir, struct dentry *old,
+		       struct inode *newdir, struct dentry *new,
+		       unsigned int flags)
+{
+	int err;
+	enum ovl_path_type old_type;
+	enum ovl_path_type new_type;
+	struct dentry *old_upperdir;
+	struct dentry *new_upperdir;
+	struct dentry *olddentry;
+	struct dentry *newdentry;
+	struct dentry *trap;
+	bool old_opaque;
+	bool new_opaque;
+	bool new_create = false;
+	bool cleanup_whiteout = false;
+	bool overwrite = !(flags & RENAME_EXCHANGE);
+	bool is_dir = S_ISDIR(old->d_inode->i_mode);
+	bool new_is_dir = false;
+	struct dentry *opaquedir = NULL;
+	const struct cred *old_cred = NULL;
+	struct cred *override_cred = NULL;
+
+	err = -EINVAL;
+	if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
+		goto out;
+
+	flags &= ~RENAME_NOREPLACE;
+
+	err = ovl_check_sticky(old);
+	if (err)
+		goto out;
+
+	/* Don't copy up directory trees */
+	old_type = ovl_path_type(old);
+	err = -EXDEV;
+	if ((old_type == OVL_PATH_LOWER || old_type == OVL_PATH_MERGE) && is_dir)
+		goto out;
+
+	if (new->d_inode) {
+		err = ovl_check_sticky(new);
+		if (err)
+			goto out;
+
+		if (S_ISDIR(new->d_inode->i_mode))
+			new_is_dir = true;
+
+		new_type = ovl_path_type(new);
+		err = -EXDEV;
+		if (!overwrite && (new_type == OVL_PATH_LOWER || new_type == OVL_PATH_MERGE) && new_is_dir)
+			goto out;
+
+		err = 0;
+		if (new_type == OVL_PATH_LOWER && old_type == OVL_PATH_LOWER) {
+			if (ovl_dentry_lower(old)->d_inode ==
+			    ovl_dentry_lower(new)->d_inode)
+				goto out;
+		}
+		if (new_type != OVL_PATH_LOWER && old_type != OVL_PATH_LOWER) {
+			if (ovl_dentry_upper(old)->d_inode ==
+			    ovl_dentry_upper(new)->d_inode)
+				goto out;
+		}
+	} else {
+		if (ovl_dentry_is_opaque(new))
+			new_type = OVL_PATH_UPPER;
+		else
+			new_type = OVL_PATH_PURE_UPPER;
+	}
+
+	err = ovl_want_write(old);
+	if (err)
+		goto out;
+
+	err = ovl_copy_up(old);
+	if (err)
+		goto out_drop_write;
+
+	err = ovl_copy_up(new->d_parent);
+	if (err)
+		goto out_drop_write;
+	if (!overwrite) {
+		err = ovl_copy_up(new);
+		if (err)
+			goto out_drop_write;
+	}
+
+	old_opaque = old_type != OVL_PATH_PURE_UPPER;
+	new_opaque = new_type != OVL_PATH_PURE_UPPER;
+
+	if (old_opaque || new_opaque) {
+		err = -ENOMEM;
+		override_cred = prepare_creds();
+		if (!override_cred)
+			goto out_drop_write;
+
+		/*
+		 * CAP_SYS_ADMIN for setting xattr on whiteout, opaque dir
+		 * CAP_DAC_OVERRIDE for create in workdir
+		 * CAP_FOWNER for removing whiteout from sticky dir
+		 * CAP_FSETID for chmod of opaque dir
+		 * CAP_CHOWN for chown of opaque dir
+		 */
+		cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+		cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+		cap_raise(override_cred->cap_effective, CAP_FOWNER);
+		cap_raise(override_cred->cap_effective, CAP_FSETID);
+		cap_raise(override_cred->cap_effective, CAP_CHOWN);
+		old_cred = override_creds(override_cred);
+	}
+
+	if (overwrite && (new_type == OVL_PATH_LOWER || new_type == OVL_PATH_MERGE) && new_is_dir) {
+		opaquedir = ovl_check_empty_and_clear(new, new_type);
+		err = PTR_ERR(opaquedir);
+		if (IS_ERR(opaquedir)) {
+			opaquedir = NULL;
+			goto out_revert_creds;
+		}
+	}
+
+	if (overwrite) {
+		if (old_opaque) {
+			if (new->d_inode || !new_opaque) {
+				/* Whiteout source */
+				flags |= RENAME_WHITEOUT;
+			} else {
+				/* Switch whiteouts */
+				flags |= RENAME_EXCHANGE;
+			}
+		} else if (is_dir && !new->d_inode && new_opaque) {
+			flags |= RENAME_EXCHANGE;
+			cleanup_whiteout = true;
+		}
+	}
+
+	old_upperdir = ovl_dentry_upper(old->d_parent);
+	new_upperdir = ovl_dentry_upper(new->d_parent);
+
+	trap = lock_rename(new_upperdir, old_upperdir);
+
+	olddentry = ovl_dentry_upper(old);
+	newdentry = ovl_dentry_upper(new);
+	if (newdentry) {
+		if (opaquedir) {
+			newdentry = opaquedir;
+			opaquedir = NULL;
+		} else {
+			dget(newdentry);
+		}
+	} else {
+		new_create = true;
+		newdentry = lookup_one_len(new->d_name.name, new_upperdir,
+					   new->d_name.len);
+		err = PTR_ERR(newdentry);
+		if (IS_ERR(newdentry))
+			goto out_unlock;
+	}
+
+	err = -ESTALE;
+	if (olddentry->d_parent != old_upperdir)
+		goto out_dput;
+	if (newdentry->d_parent != new_upperdir)
+		goto out_dput;
+	if (olddentry == trap)
+		goto out_dput;
+	if (newdentry == trap)
+		goto out_dput;
+
+	if (is_dir && !old_opaque && new_opaque) {
+		err = ovl_set_opaque(olddentry);
+		if (err)
+			goto out_dput;
+	}
+	if (!overwrite && new_is_dir && old_opaque && !new_opaque) {
+		err = ovl_set_opaque(newdentry);
+		if (err)
+			goto out_dput;
+	}
+
+	if (old_opaque || new_opaque) {
+		err = ovl_do_rename(old_upperdir->d_inode, olddentry,
+				    new_upperdir->d_inode, newdentry,
+				    flags);
+	} else {
+		/* No debug for the plain case */
+		BUG_ON(flags & ~RENAME_EXCHANGE);
+		err = vfs_rename(old_upperdir->d_inode, olddentry,
+				 new_upperdir->d_inode, newdentry,
+				 NULL, flags);
+	}
+
+	if (err) {
+		if (is_dir && !old_opaque && new_opaque)
+			ovl_remove_opaque(olddentry);
+		if (!overwrite && new_is_dir && old_opaque && !new_opaque)
+			ovl_remove_opaque(newdentry);
+		goto out_dput;
+	}
+
+	if (is_dir && old_opaque && !new_opaque)
+		ovl_remove_opaque(olddentry);
+	if (!overwrite && new_is_dir && !old_opaque && new_opaque)
+		ovl_remove_opaque(newdentry);
+
+	if (old_opaque != new_opaque) {
+		ovl_dentry_set_opaque(old, new_opaque);
+		if (!overwrite)
+			ovl_dentry_set_opaque(new, old_opaque);
+	}
+
+	if (cleanup_whiteout)
+		ovl_cleanup(old_upperdir->d_inode, newdentry);
+
+	ovl_dentry_version_inc(old->d_parent);
+	ovl_dentry_version_inc(new->d_parent);
+
+out_dput:
+	dput(newdentry);
+out_unlock:
+	unlock_rename(new_upperdir, old_upperdir);
+out_revert_creds:
+	if (old_opaque || new_opaque) {
+		revert_creds(old_cred);
+		put_cred(override_cred);
+	}
+out_drop_write:
+	ovl_drop_write(old);
+out:
+	dput(opaquedir);
+	return err;
+}
+
+const struct inode_operations ovl_dir_inode_operations = {
+	.lookup		= ovl_lookup,
+	.mkdir		= ovl_mkdir,
+	.symlink	= ovl_symlink,
+	.unlink		= ovl_unlink,
+	.rmdir		= ovl_rmdir,
+	.rename2	= ovl_rename2,
+	.link		= ovl_link,
+	.setattr	= ovl_setattr,
+	.create		= ovl_create,
+	.mknod		= ovl_mknod,
+	.permission	= ovl_permission,
+	.getattr	= ovl_dir_getattr,
+	.setxattr	= ovl_setxattr,
+	.getxattr	= ovl_getxattr,
+	.listxattr	= ovl_listxattr,
+	.removexattr	= ovl_removexattr,
+};
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
new file mode 100644
index 000000000000..af2d18c9fcee
--- /dev/null
+++ b/fs/overlayfs/inode.c
@@ -0,0 +1,425 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/xattr.h>
+#include "overlayfs.h"
+
+static int ovl_copy_up_last(struct dentry *dentry, struct iattr *attr,
+			    bool no_data)
+{
+	int err;
+	struct dentry *parent;
+	struct kstat stat;
+	struct path lowerpath;
+
+	parent = dget_parent(dentry);
+	err = ovl_copy_up(parent);
+	if (err)
+		goto out_dput_parent;
+
+	ovl_path_lower(dentry, &lowerpath);
+	err = vfs_getattr(&lowerpath, &stat);
+	if (err)
+		goto out_dput_parent;
+
+	if (no_data)
+		stat.size = 0;
+
+	err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat, attr);
+
+out_dput_parent:
+	dput(parent);
+	return err;
+}
+
+int ovl_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	int err;
+	struct dentry *upperdentry;
+
+	err = ovl_want_write(dentry);
+	if (err)
+		goto out;
+
+	upperdentry = ovl_dentry_upper(dentry);
+	if (upperdentry) {
+		mutex_lock(&upperdentry->d_inode->i_mutex);
+		err = notify_change(upperdentry, attr, NULL);
+		mutex_unlock(&upperdentry->d_inode->i_mutex);
+	} else {
+		err = ovl_copy_up_last(dentry, attr, false);
+	}
+	ovl_drop_write(dentry);
+out:
+	return err;
+}
+
+static int ovl_getattr(struct vfsmount *mnt, struct dentry *dentry,
+			 struct kstat *stat)
+{
+	struct path realpath;
+
+	ovl_path_real(dentry, &realpath);
+	return vfs_getattr(&realpath, stat);
+}
+
+int ovl_permission(struct inode *inode, int mask)
+{
+	struct ovl_entry *oe;
+	struct dentry *alias = NULL;
+	struct inode *realinode;
+	struct dentry *realdentry;
+	bool is_upper;
+	int err;
+
+	if (S_ISDIR(inode->i_mode)) {
+		oe = inode->i_private;
+	} else if (mask & MAY_NOT_BLOCK) {
+		return -ECHILD;
+	} else {
+		/*
+		 * For non-directories find an alias and get the info
+		 * from there.
+		 */
+		alias = d_find_any_alias(inode);
+		if (WARN_ON(!alias))
+			return -ENOENT;
+
+		oe = alias->d_fsdata;
+	}
+
+	realdentry = ovl_entry_real(oe, &is_upper);
+
+	/* Careful in RCU walk mode */
+	realinode = ACCESS_ONCE(realdentry->d_inode);
+	if (!realinode) {
+		WARN_ON(!(mask & MAY_NOT_BLOCK));
+		err = -ENOENT;
+		goto out_dput;
+	}
+
+	if (mask & MAY_WRITE) {
+		umode_t mode = realinode->i_mode;
+
+		/*
+		 * Writes will always be redirected to upper layer, so
+		 * ignore lower layer being read-only.
+		 *
+		 * If the overlay itself is read-only then proceed
+		 * with the permission check, don't return EROFS.
+		 * This will only happen if this is the lower layer of
+		 * another overlayfs.
+		 *
+		 * If upper fs becomes read-only after the overlay was
+		 * constructed return EROFS to prevent modification of
+		 * upper layer.
+		 */
+		err = -EROFS;
+		if (is_upper && !IS_RDONLY(inode) && IS_RDONLY(realinode) &&
+		    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
+			goto out_dput;
+	}
+
+	err = __inode_permission(realinode, mask);
+out_dput:
+	dput(alias);
+	return err;
+}
+
+
+struct ovl_link_data {
+	struct dentry *realdentry;
+	void *cookie;
+};
+
+static void *ovl_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	void *ret;
+	struct dentry *realdentry;
+	struct inode *realinode;
+
+	realdentry = ovl_dentry_real(dentry);
+	realinode = realdentry->d_inode;
+
+	if (WARN_ON(!realinode->i_op->follow_link))
+		return ERR_PTR(-EPERM);
+
+	ret = realinode->i_op->follow_link(realdentry, nd);
+	if (IS_ERR(ret))
+		return ret;
+
+	if (realinode->i_op->put_link) {
+		struct ovl_link_data *data;
+
+		data = kmalloc(sizeof(struct ovl_link_data), GFP_KERNEL);
+		if (!data) {
+			realinode->i_op->put_link(realdentry, nd, ret);
+			return ERR_PTR(-ENOMEM);
+		}
+		data->realdentry = realdentry;
+		data->cookie = ret;
+
+		return data;
+	} else {
+		return NULL;
+	}
+}
+
+static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
+{
+	struct inode *realinode;
+	struct ovl_link_data *data = c;
+
+	if (!data)
+		return;
+
+	realinode = data->realdentry->d_inode;
+	realinode->i_op->put_link(data->realdentry, nd, data->cookie);
+	kfree(data);
+}
+
+static int ovl_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
+{
+	struct path realpath;
+	struct inode *realinode;
+
+	ovl_path_real(dentry, &realpath);
+	realinode = realpath.dentry->d_inode;
+
+	if (!realinode->i_op->readlink)
+		return -EINVAL;
+
+	touch_atime(&realpath);
+
+	return realinode->i_op->readlink(realpath.dentry, buf, bufsiz);
+}
+
+
+static bool ovl_is_private_xattr(const char *name)
+{
+	return strncmp(name, "trusted.overlay.", 14) == 0;
+}
+
+int ovl_setxattr(struct dentry *dentry, const char *name,
+		 const void *value, size_t size, int flags)
+{
+	int err;
+	struct dentry *upperdentry;
+
+	err = ovl_want_write(dentry);
+	if (err)
+		goto out;
+
+	err = -EPERM;
+	if (ovl_is_private_xattr(name))
+		goto out_drop_write;
+
+	err = ovl_copy_up(dentry);
+	if (err)
+		goto out_drop_write;
+
+	upperdentry = ovl_dentry_upper(dentry);
+	err = vfs_setxattr(upperdentry, name, value, size, flags);
+
+out_drop_write:
+	ovl_drop_write(dentry);
+out:
+	return err;
+}
+
+ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
+		     void *value, size_t size)
+{
+	if (ovl_path_type(dentry->d_parent) == OVL_PATH_MERGE &&
+	    ovl_is_private_xattr(name))
+		return -ENODATA;
+
+	return vfs_getxattr(ovl_dentry_real(dentry), name, value, size);
+}
+
+ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+	ssize_t res;
+	int off;
+
+	res = vfs_listxattr(ovl_dentry_real(dentry), list, size);
+	if (res <= 0 || size == 0)
+		return res;
+
+	if (ovl_path_type(dentry->d_parent) != OVL_PATH_MERGE)
+		return res;
+
+	/* filter out private xattrs */
+	for (off = 0; off < res;) {
+		char *s = list + off;
+		size_t slen = strlen(s) + 1;
+
+		BUG_ON(off + slen > res);
+
+		if (ovl_is_private_xattr(s)) {
+			res -= slen;
+			memmove(s, s + slen, res - off);
+		} else {
+			off += slen;
+		}
+	}
+
+	return res;
+}
+
+int ovl_removexattr(struct dentry *dentry, const char *name)
+{
+	int err;
+	struct path realpath;
+	enum ovl_path_type type;
+
+	err = ovl_want_write(dentry);
+	if (err)
+		goto out;
+
+	if (ovl_path_type(dentry->d_parent) == OVL_PATH_MERGE &&
+	    ovl_is_private_xattr(name))
+		goto out_drop_write;
+
+	type = ovl_path_real(dentry, &realpath);
+	if (type == OVL_PATH_LOWER) {
+		err = vfs_getxattr(realpath.dentry, name, NULL, 0);
+		if (err < 0)
+			goto out_drop_write;
+
+		err = ovl_copy_up(dentry);
+		if (err)
+			goto out_drop_write;
+
+		ovl_path_upper(dentry, &realpath);
+	}
+
+	err = vfs_removexattr(realpath.dentry, name);
+out_drop_write:
+	ovl_drop_write(dentry);
+out:
+	return err;
+}
+
+static bool ovl_open_need_copy_up(int flags, enum ovl_path_type type,
+				  struct dentry *realdentry)
+{
+	if (type != OVL_PATH_LOWER)
+		return false;
+
+	if (special_file(realdentry->d_inode->i_mode))
+		return false;
+
+	if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
+		return false;
+
+	return true;
+}
+
+static int ovl_dentry_open(struct dentry *dentry, struct file *file,
+		    const struct cred *cred)
+{
+	int err;
+	struct path realpath;
+	enum ovl_path_type type;
+	bool want_write = false;
+
+	type = ovl_path_real(dentry, &realpath);
+	if (ovl_open_need_copy_up(file->f_flags, type, realpath.dentry)) {
+		want_write = true;
+		err = ovl_want_write(dentry);
+		if (err)
+			goto out;
+
+		if (file->f_flags & O_TRUNC)
+			err = ovl_copy_up_last(dentry, NULL, true);
+		else
+			err = ovl_copy_up(dentry);
+		if (err)
+			goto out_drop_write;
+
+		ovl_path_upper(dentry, &realpath);
+	}
+
+	err = vfs_open(&realpath, file, cred);
+out_drop_write:
+	if (want_write)
+		ovl_drop_write(dentry);
+out:
+	return err;
+}
+
+static const struct inode_operations ovl_file_inode_operations = {
+	.setattr	= ovl_setattr,
+	.permission	= ovl_permission,
+	.getattr	= ovl_getattr,
+	.setxattr	= ovl_setxattr,
+	.getxattr	= ovl_getxattr,
+	.listxattr	= ovl_listxattr,
+	.removexattr	= ovl_removexattr,
+	.dentry_open	= ovl_dentry_open,
+};
+
+static const struct inode_operations ovl_symlink_inode_operations = {
+	.setattr	= ovl_setattr,
+	.follow_link	= ovl_follow_link,
+	.put_link	= ovl_put_link,
+	.readlink	= ovl_readlink,
+	.getattr	= ovl_getattr,
+	.setxattr	= ovl_setxattr,
+	.getxattr	= ovl_getxattr,
+	.listxattr	= ovl_listxattr,
+	.removexattr	= ovl_removexattr,
+};
+
+struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
+			    struct ovl_entry *oe)
+{
+	struct inode *inode;
+
+	inode = new_inode(sb);
+	if (!inode)
+		return NULL;
+
+	mode &= S_IFMT;
+
+	inode->i_ino = get_next_ino();
+	inode->i_mode = mode;
+	inode->i_flags |= S_NOATIME | S_NOCMTIME;
+
+	switch (mode) {
+	case S_IFDIR:
+		inode->i_private = oe;
+		inode->i_op = &ovl_dir_inode_operations;
+		inode->i_fop = &ovl_dir_operations;
+		break;
+
+	case S_IFLNK:
+		inode->i_op = &ovl_symlink_inode_operations;
+		break;
+
+	case S_IFREG:
+	case S_IFSOCK:
+	case S_IFBLK:
+	case S_IFCHR:
+	case S_IFIFO:
+		inode->i_op = &ovl_file_inode_operations;
+		break;
+
+	default:
+		WARN(1, "illegal file type: %i\n", mode);
+		iput(inode);
+		inode = NULL;
+	}
+
+	return inode;
+
+}
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
new file mode 100644
index 000000000000..814bed33dd07
--- /dev/null
+++ b/fs/overlayfs/overlayfs.h
@@ -0,0 +1,191 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+
+struct ovl_entry;
+
+enum ovl_path_type {
+	OVL_PATH_PURE_UPPER,
+	OVL_PATH_UPPER,
+	OVL_PATH_MERGE,
+	OVL_PATH_LOWER,
+};
+
+extern const char *ovl_opaque_xattr;
+
+static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	int err = vfs_rmdir(dir, dentry);
+	pr_debug("rmdir(%pd2) = %i\n", dentry, err);
+	return err;
+}
+
+static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int err = vfs_unlink(dir, dentry, NULL);
+	pr_debug("unlink(%pd2) = %i\n", dentry, err);
+	return err;
+}
+
+static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
+			      struct dentry *new_dentry, bool debug)
+{
+	int err = vfs_link(old_dentry, dir, new_dentry, NULL);
+	if (debug) {
+		pr_debug("link(%pd2, %pd2) = %i\n",
+			 old_dentry, new_dentry, err);
+	}
+	return err;
+}
+
+static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
+			     umode_t mode, bool debug)
+{
+	int err = vfs_create(dir, dentry, mode, true);
+	if (debug)
+		pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
+	return err;
+}
+
+static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
+			       umode_t mode, bool debug)
+{
+	int err = vfs_mkdir(dir, dentry, mode);
+	if (debug)
+		pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
+	return err;
+}
+
+static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
+			       umode_t mode, dev_t dev, bool debug)
+{
+	int err = vfs_mknod(dir, dentry, mode, dev);
+	if (debug) {
+		pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
+			 dentry, mode, dev, err);
+	}
+	return err;
+}
+
+static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
+				 const char *oldname, bool debug)
+{
+	int err = vfs_symlink(dir, dentry, oldname);
+	if (debug)
+		pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
+	return err;
+}
+
+static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
+				  const void *value, size_t size, int flags)
+{
+	int err = vfs_setxattr(dentry, name, value, size, flags);
+	pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
+		 dentry, name, (int) size, (char *) value, flags, err);
+	return err;
+}
+
+static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
+{
+	int err = vfs_removexattr(dentry, name);
+	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
+	return err;
+}
+
+static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
+				struct inode *newdir, struct dentry *newdentry,
+				unsigned int flags)
+{
+	int err;
+
+	pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
+		 olddentry, newdentry, flags);
+
+	err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
+
+	if (err) {
+		pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
+			 olddentry, newdentry, err);
+	}
+	return err;
+}
+
+static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
+{
+	int err = vfs_whiteout(dir, dentry);
+	pr_debug("whiteout(%pd2) = %i\n", dentry, err);
+	return err;
+}
+
+enum ovl_path_type ovl_path_type(struct dentry *dentry);
+u64 ovl_dentry_version_get(struct dentry *dentry);
+void ovl_dentry_version_inc(struct dentry *dentry);
+void ovl_path_upper(struct dentry *dentry, struct path *path);
+void ovl_path_lower(struct dentry *dentry, struct path *path);
+enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
+struct dentry *ovl_dentry_upper(struct dentry *dentry);
+struct dentry *ovl_dentry_lower(struct dentry *dentry);
+struct dentry *ovl_dentry_real(struct dentry *dentry);
+struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper);
+struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
+void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
+struct dentry *ovl_workdir(struct dentry *dentry);
+int ovl_want_write(struct dentry *dentry);
+void ovl_drop_write(struct dentry *dentry);
+bool ovl_dentry_is_opaque(struct dentry *dentry);
+void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
+bool ovl_is_whiteout(struct dentry *dentry);
+void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
+struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
+			  unsigned int flags);
+struct file *ovl_path_open(struct path *path, int flags);
+
+struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
+				struct kstat *stat, const char *link);
+
+/* readdir.c */
+extern const struct file_operations ovl_dir_operations;
+int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
+void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
+void ovl_cache_free(struct list_head *list);
+
+/* inode.c */
+int ovl_setattr(struct dentry *dentry, struct iattr *attr);
+int ovl_permission(struct inode *inode, int mask);
+int ovl_setxattr(struct dentry *dentry, const char *name,
+		 const void *value, size_t size, int flags);
+ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
+		     void *value, size_t size);
+ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
+int ovl_removexattr(struct dentry *dentry, const char *name);
+
+struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
+			    struct ovl_entry *oe);
+static inline void ovl_copyattr(struct inode *from, struct inode *to)
+{
+	to->i_uid = from->i_uid;
+	to->i_gid = from->i_gid;
+}
+
+/* dir.c */
+extern const struct inode_operations ovl_dir_inode_operations;
+struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
+int ovl_create_real(struct inode *dir, struct dentry *newdentry,
+		    struct kstat *stat, const char *link,
+		    struct dentry *hardlink, bool debug);
+void ovl_cleanup(struct inode *dir, struct dentry *dentry);
+
+/* copy_up.c */
+int ovl_copy_up(struct dentry *dentry);
+int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
+		    struct path *lowerpath, struct kstat *stat,
+		    struct iattr *attr);
+int ovl_copy_xattr(struct dentry *old, struct dentry *new);
+int ovl_set_attr(struct dentry *upper, struct kstat *stat);
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
new file mode 100644
index 000000000000..2a7ef4f8e2a6
--- /dev/null
+++ b/fs/overlayfs/readdir.c
@@ -0,0 +1,593 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/file.h>
+#include <linux/xattr.h>
+#include <linux/rbtree.h>
+#include <linux/security.h>
+#include <linux/cred.h>
+#include "overlayfs.h"
+
+struct ovl_cache_entry {
+	unsigned int len;
+	unsigned int type;
+	u64 ino;
+	struct list_head l_node;
+	struct rb_node node;
+	bool is_whiteout;
+	bool is_cursor;
+	char name[];
+};
+
+struct ovl_dir_cache {
+	long refcount;
+	u64 version;
+	struct list_head entries;
+};
+
+struct ovl_readdir_data {
+	struct dir_context ctx;
+	bool is_merge;
+	struct rb_root root;
+	struct list_head *list;
+	struct list_head middle;
+	int count;
+	int err;
+};
+
+struct ovl_dir_file {
+	bool is_real;
+	bool is_upper;
+	struct ovl_dir_cache *cache;
+	struct ovl_cache_entry cursor;
+	struct file *realfile;
+	struct file *upperfile;
+};
+
+static struct ovl_cache_entry *ovl_cache_entry_from_node(struct rb_node *n)
+{
+	return container_of(n, struct ovl_cache_entry, node);
+}
+
+static struct ovl_cache_entry *ovl_cache_entry_find(struct rb_root *root,
+						    const char *name, int len)
+{
+	struct rb_node *node = root->rb_node;
+	int cmp;
+
+	while (node) {
+		struct ovl_cache_entry *p = ovl_cache_entry_from_node(node);
+
+		cmp = strncmp(name, p->name, len);
+		if (cmp > 0)
+			node = p->node.rb_right;
+		else if (cmp < 0 || len < p->len)
+			node = p->node.rb_left;
+		else
+			return p;
+	}
+
+	return NULL;
+}
+
+static struct ovl_cache_entry *ovl_cache_entry_new(const char *name, int len,
+						   u64 ino, unsigned int d_type)
+{
+	struct ovl_cache_entry *p;
+	size_t size = offsetof(struct ovl_cache_entry, name[len + 1]);
+
+	p = kmalloc(size, GFP_KERNEL);
+	if (p) {
+		memcpy(p->name, name, len);
+		p->name[len] = '\0';
+		p->len = len;
+		p->type = d_type;
+		p->ino = ino;
+		p->is_whiteout = false;
+		p->is_cursor = false;
+	}
+
+	return p;
+}
+
+static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
+				  const char *name, int len, u64 ino,
+				  unsigned int d_type)
+{
+	struct rb_node **newp = &rdd->root.rb_node;
+	struct rb_node *parent = NULL;
+	struct ovl_cache_entry *p;
+
+	while (*newp) {
+		int cmp;
+		struct ovl_cache_entry *tmp;
+
+		parent = *newp;
+		tmp = ovl_cache_entry_from_node(*newp);
+		cmp = strncmp(name, tmp->name, len);
+		if (cmp > 0)
+			newp = &tmp->node.rb_right;
+		else if (cmp < 0 || len < tmp->len)
+			newp = &tmp->node.rb_left;
+		else
+			return 0;
+	}
+
+	p = ovl_cache_entry_new(name, len, ino, d_type);
+	if (p == NULL)
+		return -ENOMEM;
+
+	list_add_tail(&p->l_node, rdd->list);
+	rb_link_node(&p->node, parent, newp);
+	rb_insert_color(&p->node, &rdd->root);
+
+	return 0;
+}
+
+static int ovl_fill_lower(struct ovl_readdir_data *rdd,
+			  const char *name, int namelen,
+			  loff_t offset, u64 ino, unsigned int d_type)
+{
+	struct ovl_cache_entry *p;
+
+	p = ovl_cache_entry_find(&rdd->root, name, namelen);
+	if (p) {
+		list_move_tail(&p->l_node, &rdd->middle);
+	} else {
+		p = ovl_cache_entry_new(name, namelen, ino, d_type);
+		if (p == NULL)
+			rdd->err = -ENOMEM;
+		else
+			list_add_tail(&p->l_node, &rdd->middle);
+	}
+
+	return rdd->err;
+}
+
+void ovl_cache_free(struct list_head *list)
+{
+	struct ovl_cache_entry *p;
+	struct ovl_cache_entry *n;
+
+	list_for_each_entry_safe(p, n, list, l_node)
+		kfree(p);
+
+	INIT_LIST_HEAD(list);
+}
+
+static void ovl_cache_put(struct ovl_dir_file *od, struct dentry *dentry)
+{
+	struct ovl_dir_cache *cache = od->cache;
+
+	list_del_init(&od->cursor.l_node);
+	WARN_ON(cache->refcount <= 0);
+	cache->refcount--;
+	if (!cache->refcount) {
+		if (ovl_dir_cache(dentry) == cache)
+			ovl_set_dir_cache(dentry, NULL);
+
+		ovl_cache_free(&cache->entries);
+		kfree(cache);
+	}
+}
+
+static int ovl_fill_merge(void *buf, const char *name, int namelen,
+			  loff_t offset, u64 ino, unsigned int d_type)
+{
+	struct ovl_readdir_data *rdd = buf;
+
+	rdd->count++;
+	if (!rdd->is_merge)
+		return ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type);
+	else
+		return ovl_fill_lower(rdd, name, namelen, offset, ino, d_type);
+}
+
+static inline int ovl_dir_read(struct path *realpath,
+			       struct ovl_readdir_data *rdd)
+{
+	struct file *realfile;
+	int err;
+
+	realfile = ovl_path_open(realpath, O_RDONLY | O_DIRECTORY);
+	if (IS_ERR(realfile))
+		return PTR_ERR(realfile);
+
+	rdd->ctx.pos = 0;
+	do {
+		rdd->count = 0;
+		rdd->err = 0;
+		err = iterate_dir(realfile, &rdd->ctx);
+		if (err >= 0)
+			err = rdd->err;
+	} while (!err && rdd->count);
+	fput(realfile);
+
+	return err;
+}
+
+static void ovl_dir_reset(struct file *file)
+{
+	struct ovl_dir_file *od = file->private_data;
+	struct ovl_dir_cache *cache = od->cache;
+	struct dentry *dentry = file->f_path.dentry;
+	enum ovl_path_type type = ovl_path_type(dentry);
+
+	if (cache && ovl_dentry_version_get(dentry) != cache->version) {
+		ovl_cache_put(od, dentry);
+		od->cache = NULL;
+	}
+	WARN_ON(!od->is_real && type != OVL_PATH_MERGE);
+	if (od->is_real && type == OVL_PATH_MERGE)
+		od->is_real = false;
+}
+
+static int ovl_dir_mark_whiteouts(struct dentry *dir,
+				  struct ovl_readdir_data *rdd)
+{
+	struct ovl_cache_entry *p;
+	struct dentry *dentry;
+	const struct cred *old_cred;
+	struct cred *override_cred;
+
+	override_cred = prepare_creds();
+	if (!override_cred) {
+		ovl_cache_free(rdd->list);
+		return -ENOMEM;
+	}
+
+	/*
+	 * CAP_DAC_OVERRIDE for lookup
+	 */
+	cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+	old_cred = override_creds(override_cred);
+
+	mutex_lock(&dir->d_inode->i_mutex);
+	list_for_each_entry(p, rdd->list, l_node) {
+		if (p->is_cursor)
+			continue;
+
+		if (p->type != DT_CHR)
+			continue;
+
+		dentry = lookup_one_len(p->name, dir, p->len);
+		if (IS_ERR(dentry))
+			continue;
+
+		p->is_whiteout = ovl_is_whiteout(dentry);
+		dput(dentry);
+	}
+	mutex_unlock(&dir->d_inode->i_mutex);
+
+	revert_creds(old_cred);
+	put_cred(override_cred);
+
+	return 0;
+}
+
+static inline int ovl_dir_read_merged(struct path *upperpath,
+				      struct path *lowerpath,
+				      struct list_head *list)
+{
+	int err;
+	struct ovl_readdir_data rdd = {
+		.ctx.actor = ovl_fill_merge,
+		.list = list,
+		.root = RB_ROOT,
+		.is_merge = false,
+	};
+
+	if (upperpath->dentry) {
+		err = ovl_dir_read(upperpath, &rdd);
+		if (err)
+			goto out;
+
+		if (lowerpath->dentry) {
+			err = ovl_dir_mark_whiteouts(upperpath->dentry, &rdd);
+			if (err)
+				goto out;
+		}
+	}
+	if (lowerpath->dentry) {
+		/*
+		 * Insert lowerpath entries before upperpath ones, this allows
+		 * offsets to be reasonably constant
+		 */
+		list_add(&rdd.middle, rdd.list);
+		rdd.is_merge = true;
+		err = ovl_dir_read(lowerpath, &rdd);
+		list_del(&rdd.middle);
+	}
+out:
+	return err;
+}
+
+static void ovl_seek_cursor(struct ovl_dir_file *od, loff_t pos)
+{
+	struct ovl_cache_entry *p;
+	loff_t off = 0;
+
+	list_for_each_entry(p, &od->cache->entries, l_node) {
+		if (p->is_cursor)
+			continue;
+		if (off >= pos)
+			break;
+		off++;
+	}
+	list_move_tail(&od->cursor.l_node, &p->l_node);
+}
+
+static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry)
+{
+	int res;
+	struct path lowerpath;
+	struct path upperpath;
+	struct ovl_dir_cache *cache;
+
+	cache = ovl_dir_cache(dentry);
+	if (cache && ovl_dentry_version_get(dentry) == cache->version) {
+		cache->refcount++;
+		return cache;
+	}
+	ovl_set_dir_cache(dentry, NULL);
+
+	cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL);
+	if (!cache)
+		return ERR_PTR(-ENOMEM);
+
+	cache->refcount = 1;
+	INIT_LIST_HEAD(&cache->entries);
+
+	ovl_path_lower(dentry, &lowerpath);
+	ovl_path_upper(dentry, &upperpath);
+
+	res = ovl_dir_read_merged(&upperpath, &lowerpath, &cache->entries);
+	if (res) {
+		ovl_cache_free(&cache->entries);
+		kfree(cache);
+		return ERR_PTR(res);
+	}
+
+	cache->version = ovl_dentry_version_get(dentry);
+	ovl_set_dir_cache(dentry, cache);
+
+	return cache;
+}
+
+static int ovl_iterate(struct file *file, struct dir_context *ctx)
+{
+	struct ovl_dir_file *od = file->private_data;
+	struct dentry *dentry = file->f_path.dentry;
+
+	if (!ctx->pos)
+		ovl_dir_reset(file);
+
+	if (od->is_real)
+		return iterate_dir(od->realfile, ctx);
+
+	if (!od->cache) {
+		struct ovl_dir_cache *cache;
+
+		cache = ovl_cache_get(dentry);
+		if (IS_ERR(cache))
+			return PTR_ERR(cache);
+
+		od->cache = cache;
+		ovl_seek_cursor(od, ctx->pos);
+	}
+
+	while (od->cursor.l_node.next != &od->cache->entries) {
+		struct ovl_cache_entry *p;
+
+		p = list_entry(od->cursor.l_node.next, struct ovl_cache_entry, l_node);
+		/* Skip cursors */
+		if (!p->is_cursor) {
+			if (!p->is_whiteout) {
+				if (!dir_emit(ctx, p->name, p->len, p->ino, p->type))
+					break;
+			}
+			ctx->pos++;
+		}
+		list_move(&od->cursor.l_node, &p->l_node);
+	}
+	return 0;
+}
+
+static loff_t ovl_dir_llseek(struct file *file, loff_t offset, int origin)
+{
+	loff_t res;
+	struct ovl_dir_file *od = file->private_data;
+
+	mutex_lock(&file_inode(file)->i_mutex);
+	if (!file->f_pos)
+		ovl_dir_reset(file);
+
+	if (od->is_real) {
+		res = vfs_llseek(od->realfile, offset, origin);
+		file->f_pos = od->realfile->f_pos;
+	} else {
+		res = -EINVAL;
+
+		switch (origin) {
+		case SEEK_CUR:
+			offset += file->f_pos;
+			break;
+		case SEEK_SET:
+			break;
+		default:
+			goto out_unlock;
+		}
+		if (offset < 0)
+			goto out_unlock;
+
+		if (offset != file->f_pos) {
+			file->f_pos = offset;
+			if (od->cache)
+				ovl_seek_cursor(od, offset);
+		}
+		res = offset;
+	}
+out_unlock:
+	mutex_unlock(&file_inode(file)->i_mutex);
+
+	return res;
+}
+
+static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
+			 int datasync)
+{
+	struct ovl_dir_file *od = file->private_data;
+	struct dentry *dentry = file->f_path.dentry;
+	struct file *realfile = od->realfile;
+
+	/*
+	 * Need to check if we started out being a lower dir, but got copied up
+	 */
+	if (!od->is_upper && ovl_path_type(dentry) == OVL_PATH_MERGE) {
+		struct inode *inode = file_inode(file);
+
+		realfile =lockless_dereference(od->upperfile);
+		if (!realfile) {
+			struct path upperpath;
+
+			ovl_path_upper(dentry, &upperpath);
+			realfile = ovl_path_open(&upperpath, O_RDONLY);
+			smp_mb__before_spinlock();
+			mutex_lock(&inode->i_mutex);
+			if (!od->upperfile) {
+				if (IS_ERR(realfile)) {
+					mutex_unlock(&inode->i_mutex);
+					return PTR_ERR(realfile);
+				}
+				od->upperfile = realfile;
+			} else {
+				/* somebody has beaten us to it */
+				if (!IS_ERR(realfile))
+					fput(realfile);
+				realfile = od->upperfile;
+			}
+			mutex_unlock(&inode->i_mutex);
+		}
+	}
+
+	return vfs_fsync_range(realfile, start, end, datasync);
+}
+
+static int ovl_dir_release(struct inode *inode, struct file *file)
+{
+	struct ovl_dir_file *od = file->private_data;
+
+	if (od->cache) {
+		mutex_lock(&inode->i_mutex);
+		ovl_cache_put(od, file->f_path.dentry);
+		mutex_unlock(&inode->i_mutex);
+	}
+	fput(od->realfile);
+	if (od->upperfile)
+		fput(od->upperfile);
+	kfree(od);
+
+	return 0;
+}
+
+static int ovl_dir_open(struct inode *inode, struct file *file)
+{
+	struct path realpath;
+	struct file *realfile;
+	struct ovl_dir_file *od;
+	enum ovl_path_type type;
+
+	od = kzalloc(sizeof(struct ovl_dir_file), GFP_KERNEL);
+	if (!od)
+		return -ENOMEM;
+
+	type = ovl_path_real(file->f_path.dentry, &realpath);
+	realfile = ovl_path_open(&realpath, file->f_flags);
+	if (IS_ERR(realfile)) {
+		kfree(od);
+		return PTR_ERR(realfile);
+	}
+	INIT_LIST_HEAD(&od->cursor.l_node);
+	od->realfile = realfile;
+	od->is_real = (type != OVL_PATH_MERGE);
+	od->is_upper = (type != OVL_PATH_LOWER);
+	od->cursor.is_cursor = true;
+	file->private_data = od;
+
+	return 0;
+}
+
+const struct file_operations ovl_dir_operations = {
+	.read		= generic_read_dir,
+	.open		= ovl_dir_open,
+	.iterate	= ovl_iterate,
+	.llseek		= ovl_dir_llseek,
+	.fsync		= ovl_dir_fsync,
+	.release	= ovl_dir_release,
+};
+
+int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list)
+{
+	int err;
+	struct path lowerpath;
+	struct path upperpath;
+	struct ovl_cache_entry *p;
+
+	ovl_path_upper(dentry, &upperpath);
+	ovl_path_lower(dentry, &lowerpath);
+
+	err = ovl_dir_read_merged(&upperpath, &lowerpath, list);
+	if (err)
+		return err;
+
+	err = 0;
+
+	list_for_each_entry(p, list, l_node) {
+		if (p->is_whiteout)
+			continue;
+
+		if (p->name[0] == '.') {
+			if (p->len == 1)
+				continue;
+			if (p->len == 2 && p->name[1] == '.')
+				continue;
+		}
+		err = -ENOTEMPTY;
+		break;
+	}
+
+	return err;
+}
+
+void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list)
+{
+	struct ovl_cache_entry *p;
+
+	mutex_lock_nested(&upper->d_inode->i_mutex, I_MUTEX_CHILD);
+	list_for_each_entry(p, list, l_node) {
+		struct dentry *dentry;
+
+		if (!p->is_whiteout)
+			continue;
+
+		dentry = lookup_one_len(p->name, upper, p->len);
+		if (IS_ERR(dentry)) {
+			pr_err("overlayfs: lookup '%s/%.*s' failed (%i)\n",
+			       upper->d_name.name, p->len, p->name,
+			       (int) PTR_ERR(dentry));
+			continue;
+		}
+		ovl_cleanup(upper->d_inode, dentry);
+		dput(dentry);
+	}
+	mutex_unlock(&upper->d_inode->i_mutex);
+}
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
new file mode 100644
index 000000000000..08b704cebfc4
--- /dev/null
+++ b/fs/overlayfs/super.c
@@ -0,0 +1,796 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/parser.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/statfs.h>
+#include <linux/seq_file.h>
+#include "overlayfs.h"
+
+MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
+MODULE_DESCRIPTION("Overlay filesystem");
+MODULE_LICENSE("GPL");
+
+#define OVERLAYFS_SUPER_MAGIC 0x794c764f
+
+struct ovl_config {
+	char *lowerdir;
+	char *upperdir;
+	char *workdir;
+};
+
+/* private information held for overlayfs's superblock */
+struct ovl_fs {
+	struct vfsmount *upper_mnt;
+	struct vfsmount *lower_mnt;
+	struct dentry *workdir;
+	long lower_namelen;
+	/* pathnames of lower and upper dirs, for show_options */
+	struct ovl_config config;
+};
+
+struct ovl_dir_cache;
+
+/* private information held for every overlayfs dentry */
+struct ovl_entry {
+	struct dentry *__upperdentry;
+	struct dentry *lowerdentry;
+	struct ovl_dir_cache *cache;
+	union {
+		struct {
+			u64 version;
+			bool opaque;
+		};
+		struct rcu_head rcu;
+	};
+};
+
+const char *ovl_opaque_xattr = "trusted.overlay.opaque";
+
+
+enum ovl_path_type ovl_path_type(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	if (oe->__upperdentry) {
+		if (oe->lowerdentry) {
+			if (S_ISDIR(dentry->d_inode->i_mode))
+				return OVL_PATH_MERGE;
+			else
+				return OVL_PATH_UPPER;
+		} else {
+			if (oe->opaque)
+				return OVL_PATH_UPPER;
+			else
+				return OVL_PATH_PURE_UPPER;
+		}
+	} else {
+		return OVL_PATH_LOWER;
+	}
+}
+
+static struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe)
+{
+	struct dentry *upperdentry = ACCESS_ONCE(oe->__upperdentry);
+	/*
+	 * Make sure to order reads to upperdentry wrt ovl_dentry_update()
+	 */
+	smp_read_barrier_depends();
+	return upperdentry;
+}
+
+void ovl_path_upper(struct dentry *dentry, struct path *path)
+{
+	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	path->mnt = ofs->upper_mnt;
+	path->dentry = ovl_upperdentry_dereference(oe);
+}
+
+enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path)
+{
+
+	enum ovl_path_type type = ovl_path_type(dentry);
+
+	if (type == OVL_PATH_LOWER)
+		ovl_path_lower(dentry, path);
+	else
+		ovl_path_upper(dentry, path);
+
+	return type;
+}
+
+struct dentry *ovl_dentry_upper(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	return ovl_upperdentry_dereference(oe);
+}
+
+struct dentry *ovl_dentry_lower(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	return oe->lowerdentry;
+}
+
+struct dentry *ovl_dentry_real(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+	struct dentry *realdentry;
+
+	realdentry = ovl_upperdentry_dereference(oe);
+	if (!realdentry)
+		realdentry = oe->lowerdentry;
+
+	return realdentry;
+}
+
+struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper)
+{
+	struct dentry *realdentry;
+
+	realdentry = ovl_upperdentry_dereference(oe);
+	if (realdentry) {
+		*is_upper = true;
+	} else {
+		realdentry = oe->lowerdentry;
+		*is_upper = false;
+	}
+	return realdentry;
+}
+
+struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	return oe->cache;
+}
+
+void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	oe->cache = cache;
+}
+
+void ovl_path_lower(struct dentry *dentry, struct path *path)
+{
+	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	path->mnt = ofs->lower_mnt;
+	path->dentry = oe->lowerdentry;
+}
+
+int ovl_want_write(struct dentry *dentry)
+{
+	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+	return mnt_want_write(ofs->upper_mnt);
+}
+
+void ovl_drop_write(struct dentry *dentry)
+{
+	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+	mnt_drop_write(ofs->upper_mnt);
+}
+
+struct dentry *ovl_workdir(struct dentry *dentry)
+{
+	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+	return ofs->workdir;
+}
+
+bool ovl_dentry_is_opaque(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+	return oe->opaque;
+}
+
+void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+	oe->opaque = opaque;
+}
+
+void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	WARN_ON(!mutex_is_locked(&upperdentry->d_parent->d_inode->i_mutex));
+	WARN_ON(oe->__upperdentry);
+	BUG_ON(!upperdentry->d_inode);
+	/*
+	 * Make sure upperdentry is consistent before making it visible to
+	 * ovl_upperdentry_dereference().
+	 */
+	smp_wmb();
+	oe->__upperdentry = upperdentry;
+}
+
+void ovl_dentry_version_inc(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	WARN_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
+	oe->version++;
+}
+
+u64 ovl_dentry_version_get(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	WARN_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
+	return oe->version;
+}
+
+bool ovl_is_whiteout(struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+
+	return inode && IS_WHITEOUT(inode);
+}
+
+static bool ovl_is_opaquedir(struct dentry *dentry)
+{
+	int res;
+	char val;
+	struct inode *inode = dentry->d_inode;
+
+	if (!S_ISDIR(inode->i_mode) || !inode->i_op->getxattr)
+		return false;
+
+	res = inode->i_op->getxattr(dentry, ovl_opaque_xattr, &val, 1);
+	if (res == 1 && val == 'y')
+		return true;
+
+	return false;
+}
+
+static void ovl_dentry_release(struct dentry *dentry)
+{
+	struct ovl_entry *oe = dentry->d_fsdata;
+
+	if (oe) {
+		dput(oe->__upperdentry);
+		dput(oe->lowerdentry);
+		kfree_rcu(oe, rcu);
+	}
+}
+
+static const struct dentry_operations ovl_dentry_operations = {
+	.d_release = ovl_dentry_release,
+};
+
+static struct ovl_entry *ovl_alloc_entry(void)
+{
+	return kzalloc(sizeof(struct ovl_entry), GFP_KERNEL);
+}
+
+static inline struct dentry *ovl_lookup_real(struct dentry *dir,
+					     struct qstr *name)
+{
+	struct dentry *dentry;
+
+	mutex_lock(&dir->d_inode->i_mutex);
+	dentry = lookup_one_len(name->name, dir, name->len);
+	mutex_unlock(&dir->d_inode->i_mutex);
+
+	if (IS_ERR(dentry)) {
+		if (PTR_ERR(dentry) == -ENOENT)
+			dentry = NULL;
+	} else if (!dentry->d_inode) {
+		dput(dentry);
+		dentry = NULL;
+	}
+	return dentry;
+}
+
+struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
+			  unsigned int flags)
+{
+	struct ovl_entry *oe;
+	struct dentry *upperdir;
+	struct dentry *lowerdir;
+	struct dentry *upperdentry = NULL;
+	struct dentry *lowerdentry = NULL;
+	struct inode *inode = NULL;
+	int err;
+
+	err = -ENOMEM;
+	oe = ovl_alloc_entry();
+	if (!oe)
+		goto out;
+
+	upperdir = ovl_dentry_upper(dentry->d_parent);
+	lowerdir = ovl_dentry_lower(dentry->d_parent);
+
+	if (upperdir) {
+		upperdentry = ovl_lookup_real(upperdir, &dentry->d_name);
+		err = PTR_ERR(upperdentry);
+		if (IS_ERR(upperdentry))
+			goto out_put_dir;
+
+		if (lowerdir && upperdentry) {
+			if (ovl_is_whiteout(upperdentry)) {
+				dput(upperdentry);
+				upperdentry = NULL;
+				oe->opaque = true;
+			} else if (ovl_is_opaquedir(upperdentry)) {
+				oe->opaque = true;
+			}
+		}
+	}
+	if (lowerdir && !oe->opaque) {
+		lowerdentry = ovl_lookup_real(lowerdir, &dentry->d_name);
+		err = PTR_ERR(lowerdentry);
+		if (IS_ERR(lowerdentry))
+			goto out_dput_upper;
+	}
+
+	if (lowerdentry && upperdentry &&
+	    (!S_ISDIR(upperdentry->d_inode->i_mode) ||
+	     !S_ISDIR(lowerdentry->d_inode->i_mode))) {
+		dput(lowerdentry);
+		lowerdentry = NULL;
+		oe->opaque = true;
+	}
+
+	if (lowerdentry || upperdentry) {
+		struct dentry *realdentry;
+
+		realdentry = upperdentry ? upperdentry : lowerdentry;
+		err = -ENOMEM;
+		inode = ovl_new_inode(dentry->d_sb, realdentry->d_inode->i_mode,
+				      oe);
+		if (!inode)
+			goto out_dput;
+		ovl_copyattr(realdentry->d_inode, inode);
+	}
+
+	oe->__upperdentry = upperdentry;
+	oe->lowerdentry = lowerdentry;
+
+	dentry->d_fsdata = oe;
+	d_add(dentry, inode);
+
+	return NULL;
+
+out_dput:
+	dput(lowerdentry);
+out_dput_upper:
+	dput(upperdentry);
+out_put_dir:
+	kfree(oe);
+out:
+	return ERR_PTR(err);
+}
+
+struct file *ovl_path_open(struct path *path, int flags)
+{
+	return dentry_open(path, flags, current_cred());
+}
+
+static void ovl_put_super(struct super_block *sb)
+{
+	struct ovl_fs *ufs = sb->s_fs_info;
+
+	dput(ufs->workdir);
+	mntput(ufs->upper_mnt);
+	mntput(ufs->lower_mnt);
+
+	kfree(ufs->config.lowerdir);
+	kfree(ufs->config.upperdir);
+	kfree(ufs->config.workdir);
+	kfree(ufs);
+}
+
+/**
+ * ovl_statfs
+ * @sb: The overlayfs super block
+ * @buf: The struct kstatfs to fill in with stats
+ *
+ * Get the filesystem statistics.  As writes always target the upper layer
+ * filesystem pass the statfs to the same filesystem.
+ */
+static int ovl_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+	struct dentry *root_dentry = dentry->d_sb->s_root;
+	struct path path;
+	int err;
+
+	ovl_path_upper(root_dentry, &path);
+
+	err = vfs_statfs(&path, buf);
+	if (!err) {
+		buf->f_namelen = max(buf->f_namelen, ofs->lower_namelen);
+		buf->f_type = OVERLAYFS_SUPER_MAGIC;
+	}
+
+	return err;
+}
+
+/**
+ * ovl_show_options
+ *
+ * Prints the mount options for a given superblock.
+ * Returns zero; does not fail.
+ */
+static int ovl_show_options(struct seq_file *m, struct dentry *dentry)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct ovl_fs *ufs = sb->s_fs_info;
+
+	seq_printf(m, ",lowerdir=%s", ufs->config.lowerdir);
+	seq_printf(m, ",upperdir=%s", ufs->config.upperdir);
+	seq_printf(m, ",workdir=%s", ufs->config.workdir);
+	return 0;
+}
+
+static const struct super_operations ovl_super_operations = {
+	.put_super	= ovl_put_super,
+	.statfs		= ovl_statfs,
+	.show_options	= ovl_show_options,
+};
+
+enum {
+	OPT_LOWERDIR,
+	OPT_UPPERDIR,
+	OPT_WORKDIR,
+	OPT_ERR,
+};
+
+static const match_table_t ovl_tokens = {
+	{OPT_LOWERDIR,			"lowerdir=%s"},
+	{OPT_UPPERDIR,			"upperdir=%s"},
+	{OPT_WORKDIR,			"workdir=%s"},
+	{OPT_ERR,			NULL}
+};
+
+static int ovl_parse_opt(char *opt, struct ovl_config *config)
+{
+	char *p;
+
+	while ((p = strsep(&opt, ",")) != NULL) {
+		int token;
+		substring_t args[MAX_OPT_ARGS];
+
+		if (!*p)
+			continue;
+
+		token = match_token(p, ovl_tokens, args);
+		switch (token) {
+		case OPT_UPPERDIR:
+			kfree(config->upperdir);
+			config->upperdir = match_strdup(&args[0]);
+			if (!config->upperdir)
+				return -ENOMEM;
+			break;
+
+		case OPT_LOWERDIR:
+			kfree(config->lowerdir);
+			config->lowerdir = match_strdup(&args[0]);
+			if (!config->lowerdir)
+				return -ENOMEM;
+			break;
+
+		case OPT_WORKDIR:
+			kfree(config->workdir);
+			config->workdir = match_strdup(&args[0]);
+			if (!config->workdir)
+				return -ENOMEM;
+			break;
+
+		default:
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+#define OVL_WORKDIR_NAME "work"
+
+static struct dentry *ovl_workdir_create(struct vfsmount *mnt,
+					 struct dentry *dentry)
+{
+	struct inode *dir = dentry->d_inode;
+	struct dentry *work;
+	int err;
+	bool retried = false;
+
+	err = mnt_want_write(mnt);
+	if (err)
+		return ERR_PTR(err);
+
+	mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+retry:
+	work = lookup_one_len(OVL_WORKDIR_NAME, dentry,
+			      strlen(OVL_WORKDIR_NAME));
+
+	if (!IS_ERR(work)) {
+		struct kstat stat = {
+			.mode = S_IFDIR | 0,
+		};
+
+		if (work->d_inode) {
+			err = -EEXIST;
+			if (retried)
+				goto out_dput;
+
+			retried = true;
+			ovl_cleanup(dir, work);
+			dput(work);
+			goto retry;
+		}
+
+		err = ovl_create_real(dir, work, &stat, NULL, NULL, true);
+		if (err)
+			goto out_dput;
+	}
+out_unlock:
+	mutex_unlock(&dir->i_mutex);
+	mnt_drop_write(mnt);
+
+	return work;
+
+out_dput:
+	dput(work);
+	work = ERR_PTR(err);
+	goto out_unlock;
+}
+
+static int ovl_mount_dir(const char *name, struct path *path)
+{
+	int err;
+
+	err = kern_path(name, LOOKUP_FOLLOW, path);
+	if (err) {
+		pr_err("overlayfs: failed to resolve '%s': %i\n", name, err);
+		err = -EINVAL;
+	}
+	return err;
+}
+
+static bool ovl_is_allowed_fs_type(struct dentry *root)
+{
+	const struct dentry_operations *dop = root->d_op;
+
+	/*
+	 * We don't support:
+	 *  - automount filesystems
+	 *  - filesystems with revalidate (FIXME for lower layer)
+	 *  - filesystems with case insensitive names
+	 */
+	if (dop &&
+	    (dop->d_manage || dop->d_automount ||
+	     dop->d_revalidate || dop->d_weak_revalidate ||
+	     dop->d_compare || dop->d_hash)) {
+		return false;
+	}
+	return true;
+}
+
+/* Workdir should not be subdir of upperdir and vice versa */
+static bool ovl_workdir_ok(struct dentry *workdir, struct dentry *upperdir)
+{
+	bool ok = false;
+
+	if (workdir != upperdir) {
+		ok = (lock_rename(workdir, upperdir) == NULL);
+		unlock_rename(workdir, upperdir);
+	}
+	return ok;
+}
+
+static int ovl_fill_super(struct super_block *sb, void *data, int silent)
+{
+	struct path lowerpath;
+	struct path upperpath;
+	struct path workpath;
+	struct inode *root_inode;
+	struct dentry *root_dentry;
+	struct ovl_entry *oe;
+	struct ovl_fs *ufs;
+	struct kstatfs statfs;
+	int err;
+
+	err = -ENOMEM;
+	ufs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);
+	if (!ufs)
+		goto out;
+
+	err = ovl_parse_opt((char *) data, &ufs->config);
+	if (err)
+		goto out_free_config;
+
+	/* FIXME: workdir is not needed for a R/O mount */
+	err = -EINVAL;
+	if (!ufs->config.upperdir || !ufs->config.lowerdir ||
+	    !ufs->config.workdir) {
+		pr_err("overlayfs: missing upperdir or lowerdir or workdir\n");
+		goto out_free_config;
+	}
+
+	err = -ENOMEM;
+	oe = ovl_alloc_entry();
+	if (oe == NULL)
+		goto out_free_config;
+
+	err = ovl_mount_dir(ufs->config.upperdir, &upperpath);
+	if (err)
+		goto out_free_oe;
+
+	err = ovl_mount_dir(ufs->config.lowerdir, &lowerpath);
+	if (err)
+		goto out_put_upperpath;
+
+	err = ovl_mount_dir(ufs->config.workdir, &workpath);
+	if (err)
+		goto out_put_lowerpath;
+
+	err = -EINVAL;
+	if (!S_ISDIR(upperpath.dentry->d_inode->i_mode) ||
+	    !S_ISDIR(lowerpath.dentry->d_inode->i_mode) ||
+	    !S_ISDIR(workpath.dentry->d_inode->i_mode)) {
+		pr_err("overlayfs: upperdir or lowerdir or workdir not a directory\n");
+		goto out_put_workpath;
+	}
+
+	if (upperpath.mnt != workpath.mnt) {
+		pr_err("overlayfs: workdir and upperdir must reside under the same mount\n");
+		goto out_put_workpath;
+	}
+	if (!ovl_workdir_ok(workpath.dentry, upperpath.dentry)) {
+		pr_err("overlayfs: workdir and upperdir must be separate subtrees\n");
+		goto out_put_workpath;
+	}
+
+	if (!ovl_is_allowed_fs_type(upperpath.dentry)) {
+		pr_err("overlayfs: filesystem of upperdir is not supported\n");
+		goto out_put_workpath;
+	}
+
+	if (!ovl_is_allowed_fs_type(lowerpath.dentry)) {
+		pr_err("overlayfs: filesystem of lowerdir is not supported\n");
+		goto out_put_workpath;
+	}
+
+	err = vfs_statfs(&lowerpath, &statfs);
+	if (err) {
+		pr_err("overlayfs: statfs failed on lowerpath\n");
+		goto out_put_workpath;
+	}
+	ufs->lower_namelen = statfs.f_namelen;
+
+	sb->s_stack_depth = max(upperpath.mnt->mnt_sb->s_stack_depth,
+				lowerpath.mnt->mnt_sb->s_stack_depth) + 1;
+
+	err = -EINVAL;
+	if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
+		pr_err("overlayfs: maximum fs stacking depth exceeded\n");
+		goto out_put_workpath;
+	}
+
+	ufs->upper_mnt = clone_private_mount(&upperpath);
+	err = PTR_ERR(ufs->upper_mnt);
+	if (IS_ERR(ufs->upper_mnt)) {
+		pr_err("overlayfs: failed to clone upperpath\n");
+		goto out_put_workpath;
+	}
+
+	ufs->lower_mnt = clone_private_mount(&lowerpath);
+	err = PTR_ERR(ufs->lower_mnt);
+	if (IS_ERR(ufs->lower_mnt)) {
+		pr_err("overlayfs: failed to clone lowerpath\n");
+		goto out_put_upper_mnt;
+	}
+
+	ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
+	err = PTR_ERR(ufs->workdir);
+	if (IS_ERR(ufs->workdir)) {
+		pr_err("overlayfs: failed to create directory %s/%s\n",
+		       ufs->config.workdir, OVL_WORKDIR_NAME);
+		goto out_put_lower_mnt;
+	}
+
+	/*
+	 * Make lower_mnt R/O.  That way fchmod/fchown on lower file
+	 * will fail instead of modifying lower fs.
+	 */
+	ufs->lower_mnt->mnt_flags |= MNT_READONLY;
+
+	/* If the upper fs is r/o, we mark overlayfs r/o too */
+	if (ufs->upper_mnt->mnt_sb->s_flags & MS_RDONLY)
+		sb->s_flags |= MS_RDONLY;
+
+	sb->s_d_op = &ovl_dentry_operations;
+
+	err = -ENOMEM;
+	root_inode = ovl_new_inode(sb, S_IFDIR, oe);
+	if (!root_inode)
+		goto out_put_workdir;
+
+	root_dentry = d_make_root(root_inode);
+	if (!root_dentry)
+		goto out_put_workdir;
+
+	mntput(upperpath.mnt);
+	mntput(lowerpath.mnt);
+	path_put(&workpath);
+
+	oe->__upperdentry = upperpath.dentry;
+	oe->lowerdentry = lowerpath.dentry;
+
+	root_dentry->d_fsdata = oe;
+
+	sb->s_magic = OVERLAYFS_SUPER_MAGIC;
+	sb->s_op = &ovl_super_operations;
+	sb->s_root = root_dentry;
+	sb->s_fs_info = ufs;
+
+	return 0;
+
+out_put_workdir:
+	dput(ufs->workdir);
+out_put_lower_mnt:
+	mntput(ufs->lower_mnt);
+out_put_upper_mnt:
+	mntput(ufs->upper_mnt);
+out_put_workpath:
+	path_put(&workpath);
+out_put_lowerpath:
+	path_put(&lowerpath);
+out_put_upperpath:
+	path_put(&upperpath);
+out_free_oe:
+	kfree(oe);
+out_free_config:
+	kfree(ufs->config.lowerdir);
+	kfree(ufs->config.upperdir);
+	kfree(ufs->config.workdir);
+	kfree(ufs);
+out:
+	return err;
+}
+
+static struct dentry *ovl_mount(struct file_system_type *fs_type, int flags,
+				const char *dev_name, void *raw_data)
+{
+	return mount_nodev(fs_type, flags, raw_data, ovl_fill_super);
+}
+
+static struct file_system_type ovl_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "overlayfs",
+	.mount		= ovl_mount,
+	.kill_sb	= kill_anon_super,
+};
+MODULE_ALIAS_FS("overlayfs");
+
+static int __init ovl_init(void)
+{
+	return register_filesystem(&ovl_fs_type);
+}
+
+static void __exit ovl_exit(void)
+{
+	unregister_filesystem(&ovl_fs_type);
+}
+
+module_init(ovl_init);
+module_exit(ovl_exit);
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 8b663b2d9562..6b4527216a7f 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -634,7 +634,7 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
 			dqstats_inc(DQST_LOOKUPS);
 			err = sb->dq_op->write_dquot(dquot);
 			if (!ret && err)
-				err = ret;
+				ret = err;
 			dqput(dquot);
 			spin_lock(&dq_list_lock);
 		}
diff --git a/fs/splice.c b/fs/splice.c
index f5cb9ba84510..75c6058eabf2 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1330,6 +1330,7 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
 
 	return ret;
 }
+EXPORT_SYMBOL(do_splice_direct);
 
 static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
 			       struct pipe_inode_info *opipe,
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 92e8f99a5857..281002689d64 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1338,7 +1338,10 @@ xfs_free_file_space(
 	goto out;
 }
 
-
+/*
+ * Preallocate and zero a range of a file. This mechanism has the allocation
+ * semantics of fallocate and in addition converts data in the range to zeroes.
+ */
 int
 xfs_zero_file_space(
 	struct xfs_inode	*ip,
@@ -1346,65 +1349,30 @@ xfs_zero_file_space(
 	xfs_off_t		len)
 {
 	struct xfs_mount	*mp = ip->i_mount;
-	uint			granularity;
-	xfs_off_t		start_boundary;
-	xfs_off_t		end_boundary;
+	uint			blksize;
 	int			error;
 
 	trace_xfs_zero_file_space(ip);
 
-	granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
+	blksize = 1 << mp->m_sb.sb_blocklog;
 
 	/*
-	 * Round the range of extents we are going to convert inwards.  If the
-	 * offset is aligned, then it doesn't get changed so we zero from the
-	 * start of the block offset points to.
+	 * Punch a hole and prealloc the range. We use hole punch rather than
+	 * unwritten extent conversion for two reasons:
+	 *
+	 * 1.) Hole punch handles partial block zeroing for us.
+	 *
+	 * 2.) If prealloc returns ENOSPC, the file range is still zero-valued
+	 * by virtue of the hole punch.
 	 */
-	start_boundary = round_up(offset, granularity);
-	end_boundary = round_down(offset + len, granularity);
-
-	ASSERT(start_boundary >= offset);
-	ASSERT(end_boundary <= offset + len);
-
-	if (start_boundary < end_boundary - 1) {
-		/*
-		 * Writeback the range to ensure any inode size updates due to
-		 * appending writes make it to disk (otherwise we could just
-		 * punch out the delalloc blocks).
-		 */
-		error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
-				start_boundary, end_boundary - 1);
-		if (error)
-			goto out;
-		truncate_pagecache_range(VFS_I(ip), start_boundary,
-					 end_boundary - 1);
-
-		/* convert the blocks */
-		error = xfs_alloc_file_space(ip, start_boundary,
-					end_boundary - start_boundary - 1,
-					XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT);
-		if (error)
-			goto out;
-
-		/* We've handled the interior of the range, now for the edges */
-		if (start_boundary != offset) {
-			error = xfs_iozero(ip, offset, start_boundary - offset);
-			if (error)
-				goto out;
-		}
-
-		if (end_boundary != offset + len)
-			error = xfs_iozero(ip, end_boundary,
-					   offset + len - end_boundary);
-
-	} else {
-		/*
-		 * It's either a sub-granularity range or the range spanned lies
-		 * partially across two adjacent blocks.
-		 */
-		error = xfs_iozero(ip, offset, len);
-	}
+	error = xfs_free_file_space(ip, offset, len);
+	if (error)
+		goto out;
 
+	error = xfs_alloc_file_space(ip, round_down(offset, blksize),
+				     round_up(offset + len, blksize) -
+				     round_down(offset, blksize),
+				     XFS_BMAPI_PREALLOC);
 out:
 	return error;
 
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index f1deb961a296..894924a5129b 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -236,8 +236,10 @@ xfs_bulkstat_grab_ichunk(
 	XFS_WANT_CORRUPTED_RETURN(stat == 1);
 
 	/* Check if the record contains the inode in request */
-	if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino)
-		return -EINVAL;
+	if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino) {
+		*icount = 0;
+		return 0;
+	}
 
 	idx = agino - irec->ir_startino + 1;
 	if (idx < XFS_INODES_PER_CHUNK &&
@@ -262,75 +264,76 @@ xfs_bulkstat_grab_ichunk(
 
 #define XFS_BULKSTAT_UBLEFT(ubleft)	((ubleft) >= statstruct_size)
 
+struct xfs_bulkstat_agichunk {
+	char		__user **ac_ubuffer;/* pointer into user's buffer */
+	int		ac_ubleft;	/* bytes left in user's buffer */
+	int		ac_ubelem;	/* spaces used in user's buffer */
+};
+
 /*
  * Process inodes in chunk with a pointer to a formatter function
  * that will iget the inode and fill in the appropriate structure.
  */
-int
+static int
 xfs_bulkstat_ag_ichunk(
 	struct xfs_mount		*mp,
 	xfs_agnumber_t			agno,
 	struct xfs_inobt_rec_incore	*irbp,
 	bulkstat_one_pf			formatter,
 	size_t				statstruct_size,
-	struct xfs_bulkstat_agichunk	*acp)
+	struct xfs_bulkstat_agichunk	*acp,
+	xfs_agino_t			*last_agino)
 {
-	xfs_ino_t			lastino = acp->ac_lastino;
 	char				__user **ubufp = acp->ac_ubuffer;
-	int				ubleft = acp->ac_ubleft;
-	int				ubelem = acp->ac_ubelem;
-	int				chunkidx, clustidx;
+	int				chunkidx;
 	int				error = 0;
-	xfs_agino_t			agino;
+	xfs_agino_t			agino = irbp->ir_startino;
 
-	for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
-	     XFS_BULKSTAT_UBLEFT(ubleft) &&
-	     irbp->ir_freecount < XFS_INODES_PER_CHUNK;
-	     chunkidx++, clustidx++, agino++) {
-		int		fmterror;	/* bulkstat formatter result */
+	for (chunkidx = 0; chunkidx < XFS_INODES_PER_CHUNK;
+	     chunkidx++, agino++) {
+		int		fmterror;
 		int		ubused;
-		xfs_ino_t	ino = XFS_AGINO_TO_INO(mp, agno, agino);
 
-		ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
+		/* inode won't fit in buffer, we are done */
+		if (acp->ac_ubleft < statstruct_size)
+			break;
 
 		/* Skip if this inode is free */
-		if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
-			lastino = ino;
+		if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free)
 			continue;
-		}
-
-		/*
-		 * Count used inodes as free so we can tell when the
-		 * chunk is used up.
-		 */
-		irbp->ir_freecount++;
 
 		/* Get the inode and fill in a single buffer */
 		ubused = statstruct_size;
-		error = formatter(mp, ino, *ubufp, ubleft, &ubused, &fmterror);
-		if (fmterror == BULKSTAT_RV_NOTHING) {
-			if (error && error != -ENOENT && error != -EINVAL) {
-				ubleft = 0;
-				break;
-			}
-			lastino = ino;
-			continue;
-		}
-		if (fmterror == BULKSTAT_RV_GIVEUP) {
-			ubleft = 0;
+		error = formatter(mp, XFS_AGINO_TO_INO(mp, agno, agino),
+				  *ubufp, acp->ac_ubleft, &ubused, &fmterror);
+
+		if (fmterror == BULKSTAT_RV_GIVEUP ||
+		    (error && error != -ENOENT && error != -EINVAL)) {
+			acp->ac_ubleft = 0;
 			ASSERT(error);
 			break;
 		}
-		if (*ubufp)
-			*ubufp += ubused;
-		ubleft -= ubused;
-		ubelem++;
-		lastino = ino;
+
+		/* be careful not to leak error if at end of chunk */
+		if (fmterror == BULKSTAT_RV_NOTHING || error) {
+			error = 0;
+			continue;
+		}
+
+		*ubufp += ubused;
+		acp->ac_ubleft -= ubused;
+		acp->ac_ubelem++;
 	}
 
-	acp->ac_lastino = lastino;
-	acp->ac_ubleft = ubleft;
-	acp->ac_ubelem = ubelem;
+	/*
+	 * Post-update *last_agino. At this point, agino will always point one
+	 * inode past the last inode we processed successfully. Hence we
+	 * substract that inode when setting the *last_agino cursor so that we
+	 * return the correct cookie to userspace. On the next bulkstat call,
+	 * the inode under the lastino cookie will be skipped as we have already
+	 * processed it here.
+	 */
+	*last_agino = agino - 1;
 
 	return error;
 }
@@ -353,45 +356,33 @@ xfs_bulkstat(
 	xfs_agino_t		agino;	/* inode # in allocation group */
 	xfs_agnumber_t		agno;	/* allocation group number */
 	xfs_btree_cur_t		*cur;	/* btree cursor for ialloc btree */
-	int			end_of_ag; /* set if we've seen the ag end */
-	int			error;	/* error code */
-	int                     fmterror;/* bulkstat formatter result */
-	int			i;	/* loop index */
-	int			icount;	/* count of inodes good in irbuf */
 	size_t			irbsize; /* size of irec buffer in bytes */
-	xfs_ino_t		ino;	/* inode number (filesystem) */
-	xfs_inobt_rec_incore_t	*irbp;	/* current irec buffer pointer */
 	xfs_inobt_rec_incore_t	*irbuf;	/* start of irec buffer */
-	xfs_inobt_rec_incore_t	*irbufend; /* end of good irec buffer entries */
-	xfs_ino_t		lastino; /* last inode number returned */
 	int			nirbuf;	/* size of irbuf */
-	int			rval;	/* return value error code */
-	int			tmp;	/* result value from btree calls */
 	int			ubcount; /* size of user's buffer */
-	int			ubleft;	/* bytes left in user's buffer */
-	char			__user *ubufp;	/* pointer into user's buffer */
-	int			ubelem;	/* spaces used in user's buffer */
+	struct xfs_bulkstat_agichunk ac;
+	int			error = 0;
 
 	/*
 	 * Get the last inode value, see if there's nothing to do.
 	 */
-	ino = (xfs_ino_t)*lastinop;
-	lastino = ino;
-	agno = XFS_INO_TO_AGNO(mp, ino);
-	agino = XFS_INO_TO_AGINO(mp, ino);
+	agno = XFS_INO_TO_AGNO(mp, *lastinop);
+	agino = XFS_INO_TO_AGINO(mp, *lastinop);
 	if (agno >= mp->m_sb.sb_agcount ||
-	    ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
+	    *lastinop != XFS_AGINO_TO_INO(mp, agno, agino)) {
 		*done = 1;
 		*ubcountp = 0;
 		return 0;
 	}
 
 	ubcount = *ubcountp; /* statstruct's */
-	ubleft = ubcount * statstruct_size; /* bytes */
-	*ubcountp = ubelem = 0;
+	ac.ac_ubuffer = &ubuffer;
+	ac.ac_ubleft = ubcount * statstruct_size; /* bytes */;
+	ac.ac_ubelem = 0;
+
+	*ubcountp = 0;
 	*done = 0;
-	fmterror = 0;
-	ubufp = ubuffer;
+
 	irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4);
 	if (!irbuf)
 		return -ENOMEM;
@@ -402,9 +393,13 @@ xfs_bulkstat(
 	 * Loop over the allocation groups, starting from the last
 	 * inode returned; 0 means start of the allocation group.
 	 */
-	rval = 0;
-	while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
-		cond_resched();
+	while (agno < mp->m_sb.sb_agcount) {
+		struct xfs_inobt_rec_incore	*irbp = irbuf;
+		struct xfs_inobt_rec_incore	*irbufend = irbuf + nirbuf;
+		bool				end_of_ag = false;
+		int				icount = 0;
+		int				stat;
+
 		error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 		if (error)
 			break;
@@ -414,10 +409,6 @@ xfs_bulkstat(
 		 */
 		cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
 					    XFS_BTNUM_INO);
-		irbp = irbuf;
-		irbufend = irbuf + nirbuf;
-		end_of_ag = 0;
-		icount = 0;
 		if (agino > 0) {
 			/*
 			 * In the middle of an allocation group, we need to get
@@ -427,22 +418,23 @@ xfs_bulkstat(
 
 			error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r);
 			if (error)
-				break;
+				goto del_cursor;
 			if (icount) {
 				irbp->ir_startino = r.ir_startino;
 				irbp->ir_freecount = r.ir_freecount;
 				irbp->ir_free = r.ir_free;
 				irbp++;
-				agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 			}
 			/* Increment to the next record */
-			error = xfs_btree_increment(cur, 0, &tmp);
+			error = xfs_btree_increment(cur, 0, &stat);
 		} else {
 			/* Start of ag.  Lookup the first inode chunk */
-			error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
+			error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &stat);
+		}
+		if (error || stat == 0) {
+			end_of_ag = true;
+			goto del_cursor;
 		}
-		if (error)
-			break;
 
 		/*
 		 * Loop through inode btree records in this ag,
@@ -451,10 +443,10 @@ xfs_bulkstat(
 		while (irbp < irbufend && icount < ubcount) {
 			struct xfs_inobt_rec_incore	r;
 
-			error = xfs_inobt_get_rec(cur, &r, &i);
-			if (error || i == 0) {
-				end_of_ag = 1;
-				break;
+			error = xfs_inobt_get_rec(cur, &r, &stat);
+			if (error || stat == 0) {
+				end_of_ag = true;
+				goto del_cursor;
 			}
 
 			/*
@@ -469,77 +461,79 @@ xfs_bulkstat(
 				irbp++;
 				icount += XFS_INODES_PER_CHUNK - r.ir_freecount;
 			}
-			/*
-			 * Set agino to after this chunk and bump the cursor.
-			 */
-			agino = r.ir_startino + XFS_INODES_PER_CHUNK;
-			error = xfs_btree_increment(cur, 0, &tmp);
+			error = xfs_btree_increment(cur, 0, &stat);
+			if (error || stat == 0) {
+				end_of_ag = true;
+				goto del_cursor;
+			}
 			cond_resched();
 		}
+
 		/*
-		 * Drop the btree buffers and the agi buffer.
-		 * We can't hold any of the locks these represent
-		 * when calling iget.
+		 * Drop the btree buffers and the agi buffer as we can't hold any
+		 * of the locks these represent when calling iget. If there is a
+		 * pending error, then we are done.
 		 */
+del_cursor:
 		xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 		xfs_buf_relse(agbp);
+		if (error)
+			break;
 		/*
-		 * Now format all the good inodes into the user's buffer.
+		 * Now format all the good inodes into the user's buffer. The
+		 * call to xfs_bulkstat_ag_ichunk() sets up the agino pointer
+		 * for the next loop iteration.
 		 */
 		irbufend = irbp;
 		for (irbp = irbuf;
-		     irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
-			struct xfs_bulkstat_agichunk ac;
-
-			ac.ac_lastino = lastino;
-			ac.ac_ubuffer = &ubuffer;
-			ac.ac_ubleft = ubleft;
-			ac.ac_ubelem = ubelem;
+		     irbp < irbufend && ac.ac_ubleft >= statstruct_size;
+		     irbp++) {
 			error = xfs_bulkstat_ag_ichunk(mp, agno, irbp,
-					formatter, statstruct_size, &ac);
+					formatter, statstruct_size, &ac,
+					&agino);
 			if (error)
-				rval = error;
-
-			lastino = ac.ac_lastino;
-			ubleft = ac.ac_ubleft;
-			ubelem = ac.ac_ubelem;
+				break;
 
 			cond_resched();
 		}
+
 		/*
-		 * Set up for the next loop iteration.
+		 * If we've run out of space or had a formatting error, we
+		 * are now done
 		 */
-		if (XFS_BULKSTAT_UBLEFT(ubleft)) {
-			if (end_of_ag) {
-				agno++;
-				agino = 0;
-			} else
-				agino = XFS_INO_TO_AGINO(mp, lastino);
-		} else
+		if (ac.ac_ubleft < statstruct_size || error)
 			break;
+
+		if (end_of_ag) {
+			agno++;
+			agino = 0;
+		}
 	}
 	/*
 	 * Done, we're either out of filesystem or space to put the data.
 	 */
 	kmem_free(irbuf);
-	*ubcountp = ubelem;
+	*ubcountp = ac.ac_ubelem;
+
 	/*
-	 * Found some inodes, return them now and return the error next time.
+	 * We found some inodes, so clear the error status and return them.
+	 * The lastino pointer will point directly at the inode that triggered
+	 * any error that occurred, so on the next call the error will be
+	 * triggered again and propagated to userspace as there will be no
+	 * formatted inodes in the buffer.
 	 */
-	if (ubelem)
-		rval = 0;
-	if (agno >= mp->m_sb.sb_agcount) {
-		/*
-		 * If we ran out of filesystem, mark lastino as off
-		 * the end of the filesystem, so the next call
-		 * will return immediately.
-		 */
-		*lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
+	if (ac.ac_ubelem)
+		error = 0;
+
+	/*
+	 * If we ran out of filesystem, lastino will point off the end of
+	 * the filesystem so the next call will return immediately.
+	 */
+	*lastinop = XFS_AGINO_TO_INO(mp, agno, agino);
+	if (agno >= mp->m_sb.sb_agcount)
 		*done = 1;
-	} else
-		*lastinop = (xfs_ino_t)lastino;
 
-	return rval;
+	return error;
 }
 
 int
diff --git a/fs/xfs/xfs_itable.h b/fs/xfs/xfs_itable.h
index aaed08022eb9..6ea8b3912fa4 100644
--- a/fs/xfs/xfs_itable.h
+++ b/fs/xfs/xfs_itable.h
@@ -30,22 +30,6 @@ typedef int (*bulkstat_one_pf)(struct xfs_mount	*mp,
 			       int		*ubused,
 			       int		*stat);
 
-struct xfs_bulkstat_agichunk {
-	xfs_ino_t	ac_lastino;	/* last inode returned */
-	char		__user **ac_ubuffer;/* pointer into user's buffer */
-	int		ac_ubleft;	/* bytes left in user's buffer */
-	int		ac_ubelem;	/* spaces used in user's buffer */
-};
-
-int
-xfs_bulkstat_ag_ichunk(
-	struct xfs_mount		*mp,
-	xfs_agnumber_t			agno,
-	struct xfs_inobt_rec_incore	*irbp,
-	bulkstat_one_pf			formatter,
-	size_t				statstruct_size,
-	struct xfs_bulkstat_agichunk	*acp);
-
 /*
  * Values for stat return value.
  */