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| author | Nikanth Karthikesan <knikanth@suse.de> | 2009-04-02 16:56:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-02 19:04:49 -0700 |
| commit | 97f76d3d197f201ac8a8a3ced5b8fef81568e50e (patch) | |
| tree | 8264f920a1f1a83e9cb0247ffe9390a7b6332852 /fs/buffer.c | |
| parent | 9a896c9a48ac6704c0ce8ee081b836644d0afe40 (diff) | |
| download | lwn-97f76d3d197f201ac8a8a3ced5b8fef81568e50e.tar.gz lwn-97f76d3d197f201ac8a8a3ced5b8fef81568e50e.zip | |
vfs: check bh->b_blocknr only if BH_Mapped is set
Check bh->b_blocknr only if BH_Mapped is set.
akpm: I doubt if b_blocknr is ever uninitialised here, but it could
conceivably cause a problem if we're doing a lookup for block zero.
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index f5f8b15a6e40..2963858f0f31 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -199,13 +199,13 @@ __find_get_block_slow(struct block_device *bdev, sector_t block) head = page_buffers(page); bh = head; do { - if (bh->b_blocknr == block) { + if (!buffer_mapped(bh)) + all_mapped = 0; + else if (bh->b_blocknr == block) { ret = bh; get_bh(bh); goto out_unlock; } - if (!buffer_mapped(bh)) - all_mapped = 0; bh = bh->b_this_page; } while (bh != head); |