From 2775a60447ae12350711b443be1083117b6f13b8 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Sat, 12 Mar 2016 09:29:40 +0800 Subject: md: multipath: don't hardcopy bio in .make_request path commit fafcde3ac1a418688a734365203a12483b83907a upstream. Inside multipath_make_request(), multipath maps the incoming bio into low level device's bio, but it is totally wrong to copy the bio into mapped bio via '*mapped_bio = *bio'. For example, .__bi_remaining is kept in the copy, especially if the incoming bio is chained to via bio splitting, so .bi_end_io can't be called for the mapped bio at all in the completing path in this kind of situation. This patch fixes the issue by using clone style. Reported-and-tested-by: Andrea Righi Signed-off-by: Ming Lei Signed-off-by: Shaohua Li Signed-off-by: Greg Kroah-Hartman --- drivers/md/multipath.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/md/multipath.c') diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 0a72ab6e6c20..dd483bb2e111 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -129,7 +129,9 @@ static void multipath_make_request(struct mddev *mddev, struct bio * bio) } multipath = conf->multipaths + mp_bh->path; - mp_bh->bio = *bio; + bio_init(&mp_bh->bio); + __bio_clone_fast(&mp_bh->bio, bio); + mp_bh->bio.bi_iter.bi_sector += multipath->rdev->data_offset; mp_bh->bio.bi_bdev = multipath->rdev->bdev; mp_bh->bio.bi_rw |= REQ_FAILFAST_TRANSPORT; -- cgit v1.2.3