diff options
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 6c010463b9d..bb133104e2e 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -8,6 +8,17 @@ #include "disk-io.h" #include "transaction.h" +#define PATTERN 0xDEADBEEFUL +static inline void check_pattern(struct buffer_head *buf) +{ + if (buf->b_private != (void *)PATTERN) + WARN_ON(1); +} + +static inline void set_pattern(struct buffer_head *buf) +{ + buf->b_private = (void *)PATTERN; +} static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf) { @@ -51,8 +62,10 @@ struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr) } while (bh != head); out_unlock: unlock_page(page); - if (ret) + if (ret) { touch_buffer(ret); + check_pattern(ret); + } page_cache_release(page); return ret; } @@ -82,6 +95,7 @@ struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root, bh->b_bdev = root->fs_info->sb->s_bdev; bh->b_blocknr = first_block; set_buffer_mapped(bh); + set_pattern(bh); } if (bh->b_blocknr == blocknr) { ret = bh; @@ -225,6 +239,7 @@ struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr) if (!buffer_uptodate(bh)) goto fail; csum_tree_block(root, bh, 1); + set_pattern(bh); } else { unlock_buffer(bh); } @@ -240,6 +255,7 @@ fail: int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct buffer_head *buf) { + WARN_ON(atomic_read(&buf->b_count) == 0); mark_buffer_dirty(buf); return 0; } @@ -247,6 +263,7 @@ int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct buffer_head *buf) { + WARN_ON(atomic_read(&buf->b_count) == 0); clear_buffer_dirty(buf); return 0; } @@ -431,6 +448,7 @@ int close_ctree(struct btrfs_root *root) void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf) { + check_pattern(buf); brelse(buf); } |