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-rw-r--r--fs/ext4/inode.c125
1 files changed, 68 insertions, 57 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e3126c051006..678cde834f19 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3501,10 +3501,8 @@ retry:
offset, nr_segs,
ext4_get_block, NULL, NULL, 0);
else {
- ret = blockdev_direct_IO(rw, iocb, inode,
- inode->i_sb->s_bdev, iov,
- offset, nr_segs,
- ext4_get_block, NULL);
+ ret = blockdev_direct_IO(rw, iocb, inode, iov,
+ offset, nr_segs, ext4_get_block);
if (unlikely((rw & WRITE) && ret < 0)) {
loff_t isize = i_size_read(inode);
@@ -3575,6 +3573,7 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
ssize_t size, void *private, int ret,
bool is_async)
{
+ struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
ext4_io_end_t *io_end = iocb->private;
struct workqueue_struct *wq;
unsigned long flags;
@@ -3596,6 +3595,7 @@ static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
out:
if (is_async)
aio_complete(iocb, ret, 0);
+ inode_dio_done(inode);
return;
}
@@ -3616,6 +3616,9 @@ out:
/* queue the work to convert unwritten extents to written */
queue_work(wq, &io_end->work);
iocb->private = NULL;
+
+ /* XXX: probably should move into the real I/O completion handler */
+ inode_dio_done(inode);
}
static void ext4_end_io_buffer_write(struct buffer_head *bh, int uptodate)
@@ -3748,11 +3751,13 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
EXT4_I(inode)->cur_aio_dio = iocb->private;
}
- ret = blockdev_direct_IO(rw, iocb, inode,
+ ret = __blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext4_get_block_write,
- ext4_end_io_dio);
+ ext4_end_io_dio,
+ NULL,
+ DIO_LOCKING | DIO_SKIP_HOLES);
if (iocb->private)
EXT4_I(inode)->cur_aio_dio = NULL;
/*
@@ -5351,6 +5356,8 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
}
if (attr->ia_valid & ATTR_SIZE) {
+ inode_dio_wait(inode);
+
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
@@ -5843,80 +5850,84 @@ int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
struct page *page = vmf->page;
loff_t size;
unsigned long len;
- int ret = -EINVAL;
- void *fsdata;
+ int ret;
struct file *file = vma->vm_file;
struct inode *inode = file->f_path.dentry->d_inode;
struct address_space *mapping = inode->i_mapping;
+ handle_t *handle;
+ get_block_t *get_block;
+ int retries = 0;
/*
- * Get i_alloc_sem to stop truncates messing with the inode. We cannot
- * get i_mutex because we are already holding mmap_sem.
+ * This check is racy but catches the common case. We rely on
+ * __block_page_mkwrite() to do a reliable check.
*/
- down_read(&inode->i_alloc_sem);
- size = i_size_read(inode);
- if (page->mapping != mapping || size <= page_offset(page)
- || !PageUptodate(page)) {
- /* page got truncated from under us? */
- goto out_unlock;
+ vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+ /* Delalloc case is easy... */
+ if (test_opt(inode->i_sb, DELALLOC) &&
+ !ext4_should_journal_data(inode) &&
+ !ext4_nonda_switch(inode->i_sb)) {
+ do {
+ ret = __block_page_mkwrite(vma, vmf,
+ ext4_da_get_block_prep);
+ } while (ret == -ENOSPC &&
+ ext4_should_retry_alloc(inode->i_sb, &retries));
+ goto out_ret;
}
- ret = 0;
lock_page(page);
- wait_on_page_writeback(page);
- if (PageMappedToDisk(page)) {
- up_read(&inode->i_alloc_sem);
- return VM_FAULT_LOCKED;
+ size = i_size_read(inode);
+ /* Page got truncated from under us? */
+ if (page->mapping != mapping || page_offset(page) > size) {
+ unlock_page(page);
+ ret = VM_FAULT_NOPAGE;
+ goto out;
}
if (page->index == size >> PAGE_CACHE_SHIFT)
len = size & ~PAGE_CACHE_MASK;
else
len = PAGE_CACHE_SIZE;
-
/*
- * return if we have all the buffers mapped. This avoid
- * the need to call write_begin/write_end which does a
- * journal_start/journal_stop which can block and take
- * long time
+ * Return if we have all the buffers mapped. This avoids the need to do
+ * journal_start/journal_stop which can block and take a long time
*/
if (page_has_buffers(page)) {
if (!walk_page_buffers(NULL, page_buffers(page), 0, len, NULL,
ext4_bh_unmapped)) {
- up_read(&inode->i_alloc_sem);
- return VM_FAULT_LOCKED;
+ /* Wait so that we don't change page under IO */
+ wait_on_page_writeback(page);
+ ret = VM_FAULT_LOCKED;
+ goto out;
}
}
unlock_page(page);
- /*
- * OK, we need to fill the hole... Do write_begin write_end
- * to do block allocation/reservation.We are not holding
- * inode.i__mutex here. That allow * parallel write_begin,
- * write_end call. lock_page prevent this from happening
- * on the same page though
- */
- ret = mapping->a_ops->write_begin(file, mapping, page_offset(page),
- len, AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata);
- if (ret < 0)
- goto out_unlock;
- ret = mapping->a_ops->write_end(file, mapping, page_offset(page),
- len, len, page, fsdata);
- if (ret < 0)
- goto out_unlock;
- ret = 0;
-
- /*
- * write_begin/end might have created a dirty page and someone
- * could wander in and start the IO. Make sure that hasn't
- * happened.
- */
- lock_page(page);
- wait_on_page_writeback(page);
- up_read(&inode->i_alloc_sem);
- return VM_FAULT_LOCKED;
-out_unlock:
- if (ret)
+ /* OK, we need to fill the hole... */
+ if (ext4_should_dioread_nolock(inode))
+ get_block = ext4_get_block_write;
+ else
+ get_block = ext4_get_block;
+retry_alloc:
+ handle = ext4_journal_start(inode, ext4_writepage_trans_blocks(inode));
+ if (IS_ERR(handle)) {
ret = VM_FAULT_SIGBUS;
- up_read(&inode->i_alloc_sem);
+ goto out;
+ }
+ ret = __block_page_mkwrite(vma, vmf, get_block);
+ if (!ret && ext4_should_journal_data(inode)) {
+ if (walk_page_buffers(handle, page_buffers(page), 0,
+ PAGE_CACHE_SIZE, NULL, do_journal_get_write_access)) {
+ unlock_page(page);
+ ret = VM_FAULT_SIGBUS;
+ goto out;
+ }
+ ext4_set_inode_state(inode, EXT4_STATE_JDATA);
+ }
+ ext4_journal_stop(handle);
+ if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+ goto retry_alloc;
+out_ret:
+ ret = block_page_mkwrite_return(ret);
+out:
return ret;
}