diff options
| -rw-r--r-- | fs/btrfs/disk-io.c | 78 |
1 files changed, 42 insertions, 36 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 1c8c94dbe984..de18055bede4 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -523,60 +523,35 @@ static int check_tree_block_fsid(struct extent_buffer *eb) return 1; } -int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset, - struct page *page, u64 start, u64 end, - int mirror) +/* Do basic extent buffer checks at read time */ +static int validate_extent_buffer(struct extent_buffer *eb) { + struct btrfs_fs_info *fs_info = eb->fs_info; u64 found_start; - int found_level; - struct extent_buffer *eb; - struct btrfs_fs_info *fs_info; - u16 csum_size; - int ret = 0; + const u32 csum_size = fs_info->csum_size; + u8 found_level; u8 result[BTRFS_CSUM_SIZE]; - int reads_done; - - if (!page->private) - goto out; - - eb = (struct extent_buffer *)page->private; - fs_info = eb->fs_info; - csum_size = fs_info->csum_size; - - /* the pending IO might have been the only thing that kept this buffer - * in memory. Make sure we have a ref for all this other checks - */ - atomic_inc(&eb->refs); - - reads_done = atomic_dec_and_test(&eb->io_pages); - if (!reads_done) - goto err; - - eb->read_mirror = mirror; - if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) { - ret = -EIO; - goto err; - } + int ret = 0; found_start = btrfs_header_bytenr(eb); if (found_start != eb->start) { btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu", eb->start, found_start); ret = -EIO; - goto err; + goto out; } if (check_tree_block_fsid(eb)) { btrfs_err_rl(fs_info, "bad fsid on block %llu", eb->start); ret = -EIO; - goto err; + goto out; } found_level = btrfs_header_level(eb); if (found_level >= BTRFS_MAX_LEVEL) { btrfs_err(fs_info, "bad tree block level %d on %llu", (int)btrfs_header_level(eb), eb->start); ret = -EIO; - goto err; + goto out; } btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), @@ -595,7 +570,7 @@ int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset, CSUM_FMT_VALUE(csum_size, result), btrfs_header_level(eb)); ret = -EUCLEAN; - goto err; + goto out; } /* @@ -617,6 +592,37 @@ int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset, btrfs_err(fs_info, "block=%llu read time tree block corruption detected", eb->start); +out: + return ret; +} + +int btrfs_validate_metadata_buffer(struct btrfs_io_bio *io_bio, u64 phy_offset, + struct page *page, u64 start, u64 end, + int mirror) +{ + struct extent_buffer *eb; + int ret = 0; + int reads_done; + + ASSERT(page->private); + eb = (struct extent_buffer *)page->private; + + /* + * The pending IO might have been the only thing that kept this buffer + * in memory. Make sure we have a ref for all this other checks + */ + atomic_inc(&eb->refs); + + reads_done = atomic_dec_and_test(&eb->io_pages); + if (!reads_done) + goto err; + + eb->read_mirror = mirror; + if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) { + ret = -EIO; + goto err; + } + ret = validate_extent_buffer(eb); err: if (reads_done && test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) @@ -632,7 +638,7 @@ err: clear_extent_buffer_uptodate(eb); } free_extent_buffer(eb); -out: + return ret; } |