diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-28 15:51:02 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-28 15:51:02 -0700 |
commit | c5850150d0b9ae16840c5d9846f9d5a759996a15 (patch) | |
tree | 6e3f66bff48916af728aa4173f2b7657b31c2600 /fs/xfs | |
parent | 243b422af9ea9af4ead07a8ad54c90d4f9b6081a (diff) | |
parent | 0e6e847ffe37436e331c132639f9f872febce82e (diff) | |
download | linux-c5850150d0b9ae16840c5d9846f9d5a759996a15.tar.gz linux-c5850150d0b9ae16840c5d9846f9d5a759996a15.tar.bz2 linux-c5850150d0b9ae16840c5d9846f9d5a759996a15.zip |
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
* 'for-linus' of git://oss.sgi.com/xfs/xfs:
xfs: stop using the page cache to back the buffer cache
xfs: register the inode cache shrinker before quotachecks
xfs: xfs_trans_read_buf() should return an error on failure
xfs: introduce inode cluster buffer trylocks for xfs_iflush
vmap: flush vmap aliases when mapping fails
xfs: preallocation transactions do not need to be synchronous
Fix up trivial conflicts in fs/xfs/linux-2.6/xfs_buf.c due to plug removal.
Diffstat (limited to 'fs/xfs')
-rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.c | 344 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_buf.h | 40 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_file.c | 6 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_ioctl.c | 4 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_super.c | 36 | ||||
-rw-r--r-- | fs/xfs/linux-2.6/xfs_sync.c | 30 | ||||
-rw-r--r-- | fs/xfs/xfs_inode.c | 2 | ||||
-rw-r--r-- | fs/xfs/xfs_inode_item.c | 6 | ||||
-rw-r--r-- | fs/xfs/xfs_trans_buf.c | 3 | ||||
-rw-r--r-- | fs/xfs/xfs_vnodeops.c | 3 | ||||
-rw-r--r-- | fs/xfs/xfs_vnodeops.h | 1 |
11 files changed, 160 insertions, 315 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c index c05324d3282c..596bb2c9de42 100644 --- a/fs/xfs/linux-2.6/xfs_buf.c +++ b/fs/xfs/linux-2.6/xfs_buf.c @@ -94,75 +94,6 @@ xfs_buf_vmap_len( } /* - * Page Region interfaces. - * - * For pages in filesystems where the blocksize is smaller than the - * pagesize, we use the page->private field (long) to hold a bitmap - * of uptodate regions within the page. - * - * Each such region is "bytes per page / bits per long" bytes long. - * - * NBPPR == number-of-bytes-per-page-region - * BTOPR == bytes-to-page-region (rounded up) - * BTOPRT == bytes-to-page-region-truncated (rounded down) - */ -#if (BITS_PER_LONG == 32) -#define PRSHIFT (PAGE_CACHE_SHIFT - 5) /* (32 == 1<<5) */ -#elif (BITS_PER_LONG == 64) -#define PRSHIFT (PAGE_CACHE_SHIFT - 6) /* (64 == 1<<6) */ -#else -#error BITS_PER_LONG must be 32 or 64 -#endif -#define NBPPR (PAGE_CACHE_SIZE/BITS_PER_LONG) -#define BTOPR(b) (((unsigned int)(b) + (NBPPR - 1)) >> PRSHIFT) -#define BTOPRT(b) (((unsigned int)(b) >> PRSHIFT)) - -STATIC unsigned long -page_region_mask( - size_t offset, - size_t length) -{ - unsigned long mask; - int first, final; - - first = BTOPR(offset); - final = BTOPRT(offset + length - 1); - first = min(first, final); - - mask = ~0UL; - mask <<= BITS_PER_LONG - (final - first); - mask >>= BITS_PER_LONG - (final); - - ASSERT(offset + length <= PAGE_CACHE_SIZE); - ASSERT((final - first) < BITS_PER_LONG && (final - first) >= 0); - - return mask; -} - -STATIC void -set_page_region( - struct page *page, - size_t offset, - size_t length) -{ - set_page_private(page, - page_private(page) | page_region_mask(offset, length)); - if (page_private(page) == ~0UL) - SetPageUptodate(page); -} - -STATIC int -test_page_region( - struct page *page, - size_t offset, - size_t length) -{ - unsigned long mask = page_region_mask(offset, length); - - return (mask && (page_private(page) & mask) == mask); -} - -/* * xfs_buf_lru_add - add a buffer to the LRU. * * The LRU takes a new reference to the buffer so that it will only be freed @@ -332,7 +263,7 @@ xfs_buf_free( ASSERT(list_empty(&bp->b_lru)); - if (bp->b_flags & (_XBF_PAGE_CACHE|_XBF_PAGES)) { + if (bp->b_flags & _XBF_PAGES) { uint i; if (xfs_buf_is_vmapped(bp)) @@ -342,25 +273,22 @@ xfs_buf_free( for (i = 0; i < bp->b_page_count; i++) { struct page *page = bp->b_pages[i]; - if (bp->b_flags & _XBF_PAGE_CACHE) - ASSERT(!PagePrivate(page)); - page_cache_release(page); + __free_page(page); } - } + } else if (bp->b_flags & _XBF_KMEM) + kmem_free(bp->b_addr); _xfs_buf_free_pages(bp); xfs_buf_deallocate(bp); } /* - * Finds all pages for buffer in question and builds it's page list. + * Allocates all the pages for buffer in question and builds it's page list. */ STATIC int -_xfs_buf_lookup_pages( +xfs_buf_allocate_memory( xfs_buf_t *bp, uint flags) { - struct address_space *mapping = bp->b_target->bt_mapping; - size_t blocksize = bp->b_target->bt_bsize; size_t size = bp->b_count_desired; size_t nbytes, offset; gfp_t gfp_mask = xb_to_gfp(flags); @@ -369,29 +297,55 @@ _xfs_buf_lookup_pages( xfs_off_t end; int error; + /* + * for buffers that are contained within a single page, just allocate + * the memory from the heap - there's no need for the complexity of + * page arrays to keep allocation down to order 0. + */ + if (bp->b_buffer_length < PAGE_SIZE) { + bp->b_addr = kmem_alloc(bp->b_buffer_length, xb_to_km(flags)); + if (!bp->b_addr) { + /* low memory - use alloc_page loop instead */ + goto use_alloc_page; + } + + if (((unsigned long)(bp->b_addr + bp->b_buffer_length - 1) & + PAGE_MASK) != + ((unsigned long)bp->b_addr & PAGE_MASK)) { + /* b_addr spans two pages - use alloc_page instead */ + kmem_free(bp->b_addr); + bp->b_addr = NULL; + goto use_alloc_page; + } + bp->b_offset = offset_in_page(bp->b_addr); + bp->b_pages = bp->b_page_array; + bp->b_pages[0] = virt_to_page(bp->b_addr); + bp->b_page_count = 1; + bp->b_flags |= XBF_MAPPED | _XBF_KMEM; + return 0; + } + +use_alloc_page: end = bp->b_file_offset + bp->b_buffer_length; page_count = xfs_buf_btoc(end) - xfs_buf_btoct(bp->b_file_offset); - error = _xfs_buf_get_pages(bp, page_count, flags); if (unlikely(error)) return error; - bp->b_flags |= _XBF_PAGE_CACHE; offset = bp->b_offset; - first = bp->b_file_offset >> PAGE_CACHE_SHIFT; + first = bp->b_file_offset >> PAGE_SHIFT; + bp->b_flags |= _XBF_PAGES; for (i = 0; i < bp->b_page_count; i++) { struct page *page; uint retries = 0; - - retry: - page = find_or_create_page(mapping, first + i, gfp_mask); +retry: + page = alloc_page(gfp_mask); if (unlikely(page == NULL)) { if (flags & XBF_READ_AHEAD) { bp->b_page_count = i; - for (i = 0; i < bp->b_page_count; i++) - unlock_page(bp->b_pages[i]); - return -ENOMEM; + error = ENOMEM; + goto out_free_pages; } /* @@ -412,33 +366,16 @@ _xfs_buf_lookup_pages( XFS_STATS_INC(xb_page_found); - nbytes = min_t(size_t, size, PAGE_CACHE_SIZE - offset); + nbytes = min_t(size_t, size, PAGE_SIZE - offset); size -= nbytes; - - ASSERT(!PagePrivate(page)); - if (!PageUptodate(page)) { - page_count--; - if (blocksize >= PAGE_CACHE_SIZE) { - if (flags & XBF_READ) - bp->b_flags |= _XBF_PAGE_LOCKED; - } else if (!PagePrivate(page)) { - if (test_page_region(page, offset, nbytes)) - page_count++; - } - } - bp->b_pages[i] = page; offset = 0; } + return 0; - if (!(bp->b_flags & _XBF_PAGE_LOCKED)) { - for (i = 0; i < bp->b_page_count; i++) - unlock_page(bp->b_pages[i]); - } - - if (page_count == bp->b_page_count) - bp->b_flags |= XBF_DONE; - +out_free_pages: + for (i = 0; i < bp->b_page_count; i++) + __free_page(bp->b_pages[i]); return error; } @@ -450,14 +387,23 @@ _xfs_buf_map_pages( xfs_buf_t *bp, uint flags) { - /* A single page buffer is always mappable */ + ASSERT(bp->b_flags & _XBF_PAGES); if (bp->b_page_count == 1) { + /* A single page buffer is always mappable */ bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset; bp->b_flags |= XBF_MAPPED; } else if (flags & XBF_MAPPED) { - bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, - -1, PAGE_KERNEL); - if (unlikely(bp->b_addr == NULL)) + int retried = 0; + + do { + bp->b_addr = vm_map_ram(bp->b_pages, bp->b_page_count, + -1, PAGE_KERNEL); + if (bp->b_addr) + break; + vm_unmap_aliases(); + } while (retried++ <= 1); + + if (!bp->b_addr) return -ENOMEM; bp->b_addr += bp->b_offset; bp->b_flags |= XBF_MAPPED; @@ -568,9 +514,14 @@ found: } } + /* + * if the buffer is stale, clear all the external state associated with + * it. We need to keep flags such as how we allocated the buffer memory + * intact here. + */ if (bp->b_flags & XBF_STALE) { ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0); - bp->b_flags &= XBF_MAPPED; + bp->b_flags &= XBF_MAPPED | _XBF_KMEM | _XBF_PAGES; } trace_xfs_buf_find(bp, flags, _RET_IP_); @@ -591,7 +542,7 @@ xfs_buf_get( xfs_buf_flags_t flags) { xfs_buf_t *bp, *new_bp; - int error = 0, i; + int error = 0; new_bp = xfs_buf_allocate(flags); if (unlikely(!new_bp)) @@ -599,7 +550,7 @@ xfs_buf_get( bp = _xfs_buf_find(target, ioff, isize, flags, new_bp); if (bp == new_bp) { - error = _xfs_buf_lookup_pages(bp, flags); + error = xfs_buf_allocate_memory(bp, flags); if (error) goto no_buffer; } else { @@ -608,9 +559,6 @@ xfs_buf_get( return NULL; } - for (i = 0; i < bp->b_page_count; i++) - mark_page_accessed(bp->b_pages[i]); - if (!(bp->b_flags & XBF_MAPPED)) { error = _xfs_buf_map_pages(bp, flags); if (unlikely(error)) { @@ -711,8 +659,7 @@ xfs_buf_readahead( { struct backing_dev_info *bdi; - bdi = target->bt_mapping->backing_dev_info; - if (bdi_read_congested(bdi)) + if (bdi_read_congested(target->bt_bdi)) return; xfs_buf_read(target, ioff, isize, @@ -790,10 +737,10 @@ xfs_buf_associate_memory( size_t buflen; int page_count; - pageaddr = (unsigned long)mem & PAGE_CACHE_MASK; + pageaddr = (unsigned long)mem & PAGE_MASK; offset = (unsigned long)mem - pageaddr; - buflen = PAGE_CACHE_ALIGN(len + offset); - page_count = buflen >> PAGE_CACHE_SHIFT; + buflen = PAGE_ALIGN(len + offset); + page_count = buflen >> PAGE_SHIFT; /* Free any previous set of page pointers */ if (bp->b_pages) @@ -810,13 +757,12 @@ xfs_buf_associate_memory( for (i = 0; i < bp->b_page_count; i++) { bp->b_pages[i] = mem_to_page((void *)pageaddr); - pageaddr += PAGE_CACHE_SIZE; + pageaddr += PAGE_SIZE; } bp->b_count_desired = len; bp->b_buffer_length = buflen; bp->b_flags |= XBF_MAPPED; - bp->b_flags &= ~_XBF_PAGE_LOCKED; return 0; } @@ -923,20 +869,7 @@ xfs_buf_rele( /* - * Mutual exclusion on buffers. Locking model: - * - * Buffers associated with inodes for which buffer locking - * is not enabled are not protected by semaphores, and are - * assumed to be exclusively owned by the caller. There is a - * spinlock in the buffer, used by the caller when concurrent - * access is possible. - */ - -/* - * Locks a buffer object, if it is not already locked. Note that this in - * no way locks the underlying pages, so it is only useful for - * synchronizing concurrent use of buffer objects, not for synchronizing - * independent access to the underlying pages. + * Lock a buffer object, if it is not already locked. * * If we come across a stale, pinned, locked buffer, we know that we are * being asked to lock a buffer that has been reallocated. Because it is @@ -970,10 +903,7 @@ xfs_buf_lock_value( } /* - * Locks a buffer object. - * Note that this in no way locks the underlying pages, so it is only - * useful for synchronizing concurrent use of buffer objects, not for - * synchronizing independent access to the underlying pages. + * Lock a buffer object. * * If we come across a stale, pinned, locked buffer, we know that we * are being asked to lock a buffer that has been reallocated. Because @@ -1246,10 +1176,8 @@ _xfs_buf_ioend( xfs_buf_t *bp, int schedule) { - if (atomic_dec_and_test(&bp->b_io_remaining) == 1) { - bp->b_flags &= ~_XBF_PAGE_LOCKED; + if (atomic_dec_and_test(&bp->b_io_remaining) == 1) xfs_buf_ioend(bp, schedule); - } } STATIC void @@ -1258,35 +1186,12 @@ xfs_buf_bio_end_io( int error) { xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private; - unsigned int blocksize = bp->b_target->bt_bsize; - struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; xfs_buf_ioerror(bp, -error); if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ)) invalidate_kernel_vmap_range(bp->b_addr, xfs_buf_vmap_len(bp)); - do { - struct page *page = bvec->bv_page; - - ASSERT(!PagePrivate(page)); - if (unlikely(bp->b_error)) { - if (bp->b_flags & XBF_READ) - ClearPageUptodate(page); - } else if (blocksize >= PAGE_CACHE_SIZE) { - SetPageUptodate(page); - } else if (!PagePrivate(page) && - (bp->b_flags & _XBF_PAGE_CACHE)) { - set_page_region(page, bvec->bv_offset, bvec->bv_len); - } - - if (--bvec >= bio->bi_io_vec) - prefetchw(&bvec->bv_page->flags); - - if (bp->b_flags & _XBF_PAGE_LOCKED) - unlock_page(page); - } while (bvec >= bio->bi_io_vec); - _xfs_buf_ioend(bp, 1); bio_put(bio); } @@ -1300,7 +1205,6 @@ _xfs_buf_ioapply( int offset = bp->b_offset; int size = bp->b_count_desired; sector_t sector = bp->b_bn; - unsigned int blocksize = bp->b_target->bt_bsize; total_nr_pages = bp->b_page_count; map_i = 0; @@ -1321,29 +1225,6 @@ _xfs_buf_ioapply( (bp->b_flags & XBF_READ_AHEAD) ? READA : READ; } - /* Special code path for reading a sub page size buffer in -- - * we populate up the whole page, and hence the other metadata - * in the same page. This optimization is only valid when the - * filesystem block size is not smaller than the page size. - */ - if ((bp->b_buffer_length < PAGE_CACHE_SIZE) && - ((bp->b_flags & (XBF_READ|_XBF_PAGE_LOCKED)) == - (XBF_READ|_XBF_PAGE_LOCKED)) && - (blocksize >= PAGE_CACHE_SIZE)) { - bio = bio_alloc(GFP_NOIO, 1); - - bio->bi_bdev = bp->b_target->bt_bdev; - bio->bi_sector = sector - (offset >> BBSHIFT); - bio->bi_end_io = xfs_buf_bio_end_io; - bio->bi_private = bp; - - bio_add_page(bio, bp->b_pages[0], PAGE_CACHE_SIZE, 0); - size = 0; - - atomic_inc(&bp->b_io_remaining); - - goto submit_io; - } next_chunk: atomic_inc(&bp->b_io_remaining); @@ -1357,8 +1238,9 @@ next_chunk: bio->bi_end_io = xfs_buf_bio_end_io; bio->bi_private = bp; + for (; size && nr_pages; nr_pages--, map_i++) { - int rbytes, nbytes = PAGE_CACHE_SIZE - offset; + int rbytes, nbytes = PAGE_SIZE - offset; if (nbytes > size) nbytes = size; @@ -1373,7 +1255,6 @@ next_chunk: total_nr_pages--; } -submit_io: if (likely(bio->bi_size)) { if (xfs_buf_is_vmapped(bp)) { flush_kernel_vmap_range(bp->b_addr, @@ -1383,18 +1264,7 @@ submit_io: if (size) goto next_chunk; } else { - /* - * if we get here, no pages were added to the bio. However, - * we can't just error out here - if the pages are locked then - * we have to unlock them otherwise we can hang on a later - * access to the page. - */ xfs_buf_ioerror(bp, EIO); - if (bp->b_flags & _XBF_PAGE_LOCKED) { - int i; - for (i = 0; i < bp->b_page_count; i++) - unlock_page(bp->b_pages[i]); - } bio_put(bio); } } @@ -1458,8 +1328,8 @@ xfs_buf_offset( return XFS_BUF_PTR(bp) + offset; offset += bp->b_offset; - page = bp->b_pages[offset >> PAGE_CACHE_SHIFT]; - return (xfs_caddr_t)page_address(page) + (offset & (PAGE_CACHE_SIZE-1)); + page = bp->b_pages[offset >> PAGE_SHIFT]; + return (xfs_caddr_t)page_address(page) + (offset & (PAGE_SIZE-1)); } /* @@ -1481,9 +1351,9 @@ xfs_buf_iomove( page = bp->b_pages[xfs_buf_btoct(boff + bp->b_offset)]; cpoff = xfs_buf_poff(boff + bp->b_offset); csize = min_t(size_t, - PAGE_CACHE_SIZE-cpoff, bp->b_count_desired-boff); + PAGE_SIZE-cpoff, bp->b_count_desired-boff); - ASSERT(((csize + cpoff) <= PAGE_CACHE_SIZE)); + ASSERT(((csize + cpoff) <= PAGE_SIZE)); switch (mode) { case XBRW_ZERO: @@ -1596,7 +1466,6 @@ xfs_free_buftarg( xfs_flush_buftarg(btp, 1); if (mp->m_flags & XFS_MOUNT_BARRIER) xfs_blkdev_issue_flush(btp); - iput(btp->bt_mapping->host); kthread_stop(btp->bt_task); kmem_free(btp); @@ -1620,15 +1489,6 @@ xfs_setsize_buftarg_flags( return EINVAL; } - if (verbose && - (PAGE_CACHE_SIZE / BITS_PER_LONG) > sectorsize) { - printk(KERN_WARNING - "XFS: %u byte sectors in use on device %s. " - "This is suboptimal; %u or greater is ideal.\n", - sectorsize, XFS_BUFTARG_NAME(btp), - (unsigned int)PAGE_CACHE_SIZE / BITS_PER_LONG); - } - return 0; } @@ -1643,7 +1503,7 @@ xfs_setsize_buftarg_early( struct block_device *bdev) { return xfs_setsize_buftarg_flags(btp, - PAGE_CACHE_SIZE, bdev_logical_block_size(bdev), 0); + PAGE_SIZE, bdev_logical_block_size(bdev), 0); } int @@ -1656,40 +1516,6 @@ xfs_setsize_buftarg( } STATIC int -xfs_mapping_buftarg( - xfs_buftarg_t *btp, - struct block_device *bdev) -{ - struct backing_dev_info *bdi; - struct inode *inode; - struct address_space *mapping; - static const struct address_space_operations mapping_aops = { - .migratepage = fail_migrate_page, - }; - - inode = new_inode(bdev->bd_inode->i_sb); - if (!inode) { - printk(KERN_WARNING - "XFS: Cannot allocate mapping inode for device %s\n", - XFS_BUFTARG_NAME(btp)); - return ENOMEM; - } - inode->i_ino = get_next_ino(); - inode->i_mode = S_IFBLK; - inode->i_bdev = bdev; - inode->i_rdev = bdev->bd_dev; - bdi = blk_get_backing_dev_info(bdev); - if (!bdi) - bdi = &default_backing_dev_info; - mapping = &inode->i_data; - mapping->a_ops = &mapping_aops; - mapping->backing_dev_info = bdi; - mapping_set_gfp_mask(mapping, GFP_NOFS); - btp->bt_mapping = mapping; - return 0; -} - -STATIC int xfs_alloc_delwrite_queue( xfs_buftarg_t *btp, const char *fsname) @@ -1717,12 +1543,14 @@ xfs_alloc_buftarg( btp->bt_mount = mp; btp->bt_dev = bdev->bd_dev; btp->bt_bdev = bdev; + btp->bt_bdi = blk_get_backing_dev_info(bdev); + if (!btp->bt_bdi) + goto error; + INIT_LIST_HEAD(&btp->bt_lru); spin_lock_init(&btp->bt_lru_lock); if (xfs_setsize_buftarg_early(btp, bdev)) goto error; - if (xfs_mapping_buftarg(btp, bdev)) - goto error; if (xfs_alloc_delwrite_queue(btp, fsname)) goto error; btp->bt_shrinker.shrink = xfs_buftarg_shrink; diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h index cbe65950e524..a9a1c4512645 100644 --- a/fs/xfs/linux-2.6/xfs_buf.h +++ b/fs/xfs/linux-2.6/xfs_buf.h @@ -61,30 +61,11 @@ typedef enum { #define XBF_DONT_BLOCK (1 << 16)/* do not block in current thread */ /* flags used only internally */ -#define _XBF_PAGE_CACHE (1 << 17)/* backed by pagecache */ #define _XBF_PAGES (1 << 18)/* backed by refcounted pages */ #define _XBF_RUN_QUEUES (1 << 19)/* run block device task queue */ +#define _XBF_KMEM (1 << 20)/* backed by heap memory */ #define _XBF_DELWRI_Q (1 << 21)/* buffer on delwri queue */ -/* - * Special flag for supporting metadata blocks smaller than a FSB. - * - * In this case we can have multiple xfs_buf_t on a single page and - * need to lock out concurrent xfs_buf_t readers as they only - * serialise access to the buffer. - * - * If the FSB size >= PAGE_CACHE_SIZE case, we have no serialisation - * between reads of the page. Hence we can have one thread read the - * page and modify it, but then race with another thread that thinks - * the page is not up-to-date and hence reads it again. - * - * The result is that the first modifcation to the page is lost. - * This sort of AGF/AGI reading race can happen when unlinking inodes - * that require truncation and results in the AGI unlinked list - * modifications being lost. - */ -#define _XBF_PAGE_LOCKED (1 << 22) - typedef unsigned int xfs_buf_flags_t; #define XFS_BUF_FLAGS \ @@ -100,12 +81,10 @@ typedef unsigned int xfs_buf_flags_t; { XBF_LOCK, "LOCK" }, /* should never be set */\ { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ - { _XBF_PAGE_CACHE, "PAGE_CACHE" }, \ { _XBF_PAGES, "PAGES" }, \ { _XBF_RUN_QUEUES, "RUN_QUEUES" }, \ - { _XBF_DELWRI_Q, "DELWRI_Q" }, \ - { _XBF_PAGE_LOCKED, "PAGE_LOCKED" } - + { _XBF_KMEM, "KMEM" }, \ + { _XBF_DELWRI_Q, "DELWRI_Q" } typedef enum { XBT_FORCE_SLEEP = 0, @@ -120,7 +99,7 @@ typedef struct xfs_bufhash { typedef struct xfs_buftarg { dev_t bt_dev; struct block_device *bt_bdev; - struct address_space *bt_mapping; + struct backing_dev_info *bt_bdi; struct xfs_mount *bt_mount; unsigned int bt_bsize; unsigned int bt_sshift; @@ -139,17 +118,6 @@ typedef struct xfs_buftarg { unsigned int bt_lru_nr; } xfs_buftarg_t; -/* - * xfs_buf_t: Buffer structure for pagecache-based buffers - * - * This buffer structure is used by the pagecache buffer management routines - * to refer to an assembly of pages forming a logical buffer. - * - * The buffer structure is used on a temporary basis only, and discarded when - * released. The real data storage is recorded in the pagecache. Buffers are - * hashed to the block device on which the file system resides. - */ - struct xfs_buf; typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c index a55c1b46b219..52aadfbed132 100644 --- a/fs/xfs/linux-2.6/xfs_file.c +++ b/fs/xfs/linux-2.6/xfs_file.c @@ -896,6 +896,7 @@ xfs_file_fallocate( xfs_flock64_t bf; xfs_inode_t *ip = XFS_I(inode); int cmd = XFS_IOC_RESVSP; + int attr_flags = XFS_ATTR_NOLOCK; if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) return -EOPNOTSUPP; @@ -918,7 +919,10 @@ xfs_file_fallocate( goto out_unlock; } - error = -xfs_change_file_space(ip, cmd, &bf, 0, XFS_ATTR_NOLOCK); + if (file->f_flags & O_DSYNC) + attr_flags |= XFS_ATTR_SYNC; + + error = -xfs_change_file_space(ip, cmd, &bf, 0, attr_flags); if (error) goto out_unlock; diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c index 0ca0e3c024d7..acca2c5ca3fa 100644 --- a/fs/xfs/linux-2.6/xfs_ioctl.c +++ b/fs/xfs/linux-2.6/xfs_ioctl.c @@ -624,6 +624,10 @@ xfs_ioc_space( if (filp->f_flags & (O_NDELAY|O_NONBLOCK)) attr_flags |= XFS_ATTR_NONBLOCK; + + if (filp->f_flags & O_DSYNC) + attr_flags |= XFS_ATTR_SYNC; + if (ioflags & IO_INVIS) attr_flags |= XFS_ATTR_DMI; diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c index 818c4cf2de86..1ba5c451da36 100644 --- a/fs/xfs/linux-2.6/xfs_super.c +++ b/fs/xfs/linux-2.6/xfs_super.c @@ -1078,7 +1078,7 @@ xfs_fs_write_inode( error = 0; goto out_unlock; } - error = xfs_iflush(ip, 0); + error = xfs_iflush(ip, SYNC_TRYLOCK); } out_unlock: @@ -1539,10 +1539,14 @@ xfs_fs_fill_super( if (error) goto out_free_sb; - error = xfs_mountfs(mp); - if (error) - goto out_filestream_unmount; - + /* + * we must configure the block size in the superblock before we run the + * full mount process as the mount process can lookup and cache inodes. + * For the same reason we must also initialise the syncd and register + * the inode cache shrinker so that inodes can be reclaimed during + * operations like a quotacheck that iterate all inodes in the + * filesystem. + */ sb->s_magic = XFS_SB_MAGIC; sb->s_blocksize = mp->m_sb.sb_blocksize; sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1; @@ -1550,6 +1554,16 @@ xfs_fs_fill_super( sb->s_time_gran = 1; set_posix_acl_flag(sb); + error = xfs_syncd_init(mp); + if (error) + goto out_filestream_unmount; + + xfs_inode_shrinker_register(mp); + + error = xfs_mountfs(mp); + if (error) + goto out_syncd_stop; + root = igrab(VFS_I(mp->m_rootip)); if (!root) { error = ENOENT; @@ -1565,14 +1579,11 @@ xfs_fs_fill_super( goto fail_vnrele; } - error = xfs_syncd_init(mp); - if (error) - goto fail_vnrele; - - xfs_inode_shrinker_register(mp); - return 0; + out_syncd_stop: + xfs_inode_shrinker_unregister(mp); + xfs_syncd_stop(mp); out_filestream_unmount: xfs_filestream_unmount(mp); out_free_sb: @@ -1596,6 +1607,9 @@ xfs_fs_fill_super( } fail_unmount: + xfs_inode_shrinker_unregister(mp); + xfs_syncd_stop(mp); + /* * Blow away any referenced inode in the filestreams cache. * This can and will cause log traffic as inodes go inactive diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c index 6c10f1d2e3d3..594cd822d84d 100644 --- a/fs/xfs/linux-2.6/xfs_sync.c +++ b/fs/xfs/linux-2.6/xfs_sync.c @@ -761,8 +761,10 @@ xfs_reclaim_inode( struct xfs_perag *pag, int sync_mode) { - int error = 0; + int error; +restart: + error = 0; xfs_ilock(ip, XFS_ILOCK_EXCL); if (!xfs_iflock_nowait(ip)) { if (!(sync_mode & SYNC_WAIT)) @@ -788,9 +790,31 @@ xfs_reclaim_inode( if (xfs_inode_clean(ip)) goto reclaim; - /* Now we have an inode that needs flushing */ - error = xfs_iflush(ip, sync_mode); + /* + * Now we have an inode that needs flushing. + * + * We do a nonblocking flush here even if we are doing a SYNC_WAIT + * reclaim as we can deadlock with inode cluster removal. + * xfs_ifree_cluster() can lock the inode buffer before it locks the + * ip->i_lock, and we are doing the exact opposite here. As a result, + * doing a blocking xfs_itobp() to get the cluster buffer will result + * in an ABBA deadlock with xfs_ifree_cluster(). + * + * As xfs_ifree_cluser() must gather all inodes that are active in the + * cache to mark them stale, if we hit this case we don't actually want + * to do IO here - we want the inode marked stale so we can simply + * reclaim it. Hence if we get an EAGAIN error on a SYNC_WAIT flush, + * just unlock the inode, back off and try again. Hopefully the next + * pass through will see the stale flag set on the inode. + */ + error = xfs_iflush(ip, SYNC_TRYLOCK | sync_mode); if (sync_mode & SYNC_WAIT) { + if (error == EAGAIN) { + xfs_iunlock(ip, XFS_ILOCK_EXCL); + /* backoff longer than in xfs_ifree_cluster */ + delay(2); + goto restart; + } xfs_iflock(ip); goto reclaim; } diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index da871f532236..742c8330994a 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -2835,7 +2835,7 @@ xfs_iflush( * Get the buffer containing the on-disk inode. */ error = xfs_itobp(mp, NULL, ip, &dip, &bp, - (flags & SYNC_WAIT) ? XBF_LOCK : XBF_TRYLOCK); + (flags & SYNC_TRYLOCK) ? XBF_TRYLOCK : XBF_LOCK); if (error || !bp) { xfs_ifunlock(ip); return error; diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index fd4f398bd6f1..46cc40131d4a 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -760,11 +760,11 @@ xfs_inode_item_push( * Push the inode to it's backing buffer. This will not remove the * inode from the AIL - a further push will be required to trigger a * buffer push. However, this allows all the dirty inodes to be pushed - * to the buffer before it is pushed to disk. THe buffer IO completion - * will pull th einode from the AIL, mark it clean and unlock the flush + * to the buffer before it is pushed to disk. The buffer IO completion + * will pull the inode from the AIL, mark it clean and unlock the flush * lock. */ - (void) xfs_iflush(ip, 0); + (void) xfs_iflush(ip, SYNC_TRYLOCK); xfs_iunlock(ip, XFS_ILOCK_SHARED); } diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c index 3bea66132334..03b3b7f85a3b 100644 --- a/fs/xfs/xfs_trans_buf.c +++ b/fs/xfs/xfs_trans_buf.c @@ -383,7 +383,8 @@ xfs_trans_read_buf( bp = xfs_buf_read(target, blkno, len, flags | XBF_DONT_BLOCK); if (bp == NULL) { *bpp = NULL; - return 0; + return (flags & XBF_TRYLOCK) ? + 0 : XFS_ERROR(ENOMEM); } if (XFS_BUF_GETERROR(bp) != 0) { XFS_BUF_SUPER_STALE(bp); diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c index 37d8146ee15b..c48b4217ec47 100644 --- a/fs/xfs/xfs_vnodeops.c +++ b/fs/xfs/xfs_vnodeops.c @@ -2831,7 +2831,8 @@ xfs_change_file_space( ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - xfs_trans_set_sync(tp); + if (attr_flags & XFS_ATTR_SYNC) + xfs_trans_set_sync(tp); error = xfs_trans_commit(tp, 0); diff --git a/fs/xfs/xfs_vnodeops.h b/fs/xfs/xfs_vnodeops.h index f6702927eee4..3bcd23353d6c 100644 --- a/fs/xfs/xfs_vnodeops.h +++ b/fs/xfs/xfs_vnodeops.h @@ -18,6 +18,7 @@ int xfs_setattr(struct xfs_inode *ip, struct iattr *vap, int flags); #define XFS_ATTR_NONBLOCK 0x02 /* return EAGAIN if operation would block */ #define XFS_ATTR_NOLOCK 0x04 /* Don't grab any conflicting locks */ #define XFS_ATTR_NOACL 0x08 /* Don't call xfs_acl_chmod */ +#define XFS_ATTR_SYNC 0x10 /* synchronous operation required */ int xfs_readlink(struct xfs_inode *ip, char *link); int xfs_release(struct xfs_inode *ip); |