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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2012-09-25 23:19:25 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-09-25 23:19:25 -0400 |
| commit | 7f1468d1d50d368097ab13596dc08eaba7eace7f (patch) | |
| tree | 6215860a4aabdec7d725ae901b13bba31514b583 /fs/ext4/resize.c | |
| parent | f2a09af645b762f8230e7eba7fee3b6f7e6e96e7 (diff) | |
| download | linux-7f1468d1d50d368097ab13596dc08eaba7eace7f.tar.gz linux-7f1468d1d50d368097ab13596dc08eaba7eace7f.tar.bz2 linux-7f1468d1d50d368097ab13596dc08eaba7eace7f.zip | |
ext4: fix double unlock buffer mess during fs-resize
bh_submit_read() is responsible for unlock bh on endio. In addition,
we need to use bh_uptodate_or_lock() to avoid races.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/resize.c')
| -rw-r--r-- | fs/ext4/resize.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 9f821ce39800..f21fdbf5c75d 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1181,17 +1181,12 @@ static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block) struct buffer_head *bh = sb_getblk(sb, block); if (!bh) return NULL; - - if (bitmap_uptodate(bh)) - return bh; - - lock_buffer(bh); - if (bh_submit_read(bh) < 0) { - unlock_buffer(bh); - brelse(bh); - return NULL; + if (!bh_uptodate_or_lock(bh)) { + if (bh_submit_read(bh) < 0) { + brelse(bh); + return NULL; + } } - unlock_buffer(bh); return bh; } |