diff options
| author | Vyacheslav Dubeyko <slava@dubeyko.com> | 2013-08-22 16:35:45 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-09-10 01:57:29 +0100 |
| commit | 09427b652799cb707f9c1a6edadfce314e4902e6 (patch) | |
| tree | 0f1a1f0e10f5c566a88b7d027e9a83e19ddf2e6a | |
| parent | c74978269d1a066413b8ce93bd91566d0dc84e40 (diff) | |
nilfs2: fix issue with counting number of bio requests for BIO_EOPNOTSUPP error detection
commit 4bf93b50fd04118ac7f33a3c2b8a0a1f9fa80bc9 upstream.
Fix the issue with improper counting number of flying bio requests for
BIO_EOPNOTSUPP error detection case.
The sb_nbio must be incremented exactly the same number of times as
complete() function was called (or will be called) because
nilfs_segbuf_wait() will call wail_for_completion() for the number of
times set to sb_nbio:
do {
wait_for_completion(&segbuf->sb_bio_event);
} while (--segbuf->sb_nbio > 0);
Two functions complete() and wait_for_completion() must be called the
same number of times for the same sb_bio_event. Otherwise,
wait_for_completion() will hang or leak.
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | fs/nilfs2/segbuf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c index ec6df85906d..07a666ac4b5 100644 --- a/fs/nilfs2/segbuf.c +++ b/fs/nilfs2/segbuf.c @@ -376,12 +376,12 @@ static int nilfs_segbuf_submit_bio(struct nilfs_segment_buffer *segbuf, bio->bi_private = segbuf; bio_get(bio); submit_bio(mode, bio); + segbuf->sb_nbio++; if (bio_flagged(bio, BIO_EOPNOTSUPP)) { bio_put(bio); err = -EOPNOTSUPP; goto failed; } - segbuf->sb_nbio++; bio_put(bio); wi->bio = NULL; |