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btrfs: fix missing increment of bi_remaining 

In btrfs_end_bio(), we increment bi_remaining if is_orig_bio. If not,
we restore the orig_bio but failed to increment bi_remaining for
orig_bio, which triggers a BUG_ON later when bio_endio is called. Fix
is to increment bi_remaining when we restore the orig bio as well.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
CC: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Muthukumar Ratty <muthur@gmail.com>
Reviewed-by: Chris Mason <clm@fb.com>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Muthu Kumar 2014-01-08 14:19:52 -07:00 committed by Jens Axboe
parent 1331107f8a
commit c7b22bb19a
1 changed files with 7 additions and 2 deletions
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9
fs/btrfs/volumes.c
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@ -5297,9 +5297,14 @@ static void btrfs_end_bio(struct bio *bio, int err)
if (!is_orig_bio) {
bio_put(bio);
bio = bbio->orig_bio;
} else {
atomic_inc(&bio->bi_remaining);
}
/*
* We have original bio now. So increment bi_remaining to
* account for it in endio
*/
atomic_inc(&bio->bi_remaining);
bio->bi_private = bbio->private;
bio->bi_end_io = bbio->end_io;
btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;