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authorVyacheslav Dubeyko <slava@dubeyko.com>2013-08-22 16:35:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-08-23 09:51:22 -0700
commit4bf93b50fd04118ac7f33a3c2b8a0a1f9fa80bc9 (patch)
tree46da4b4982c9b6cca343b25c3869bf93a23cbed7
parent2df37a19c686c2d7c4e9b4ce1505b5141e3e5552 (diff)
downloadlinux-sh-4bf93b50fd04118ac7f33a3c2b8a0a1f9fa80bc9.tar.gz
nilfs2: fix issue with counting number of bio requests for BIO_EOPNOTSUPP error detection
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> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/nilfs2/segbuf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 5bacf46dc4b3..2d8be51f90dc 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;