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Date: Fri, 1 Apr 2016 17:52:58 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Ming Lei <ming.lei@...onical.com>, Shaohua Li <shli@...com>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.19.y-ckt 092/170] md: multipath: don't hardcopy bio in .make_request path 3.19.8-ckt18 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Ming Lei <ming.lei@...onical.com> 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 <righi.andrea@...il.com> Signed-off-by: Ming Lei <ming.lei@...onical.com> Signed-off-by: Shaohua Li <shli@...com> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- drivers/md/multipath.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 399272f..2df218d 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; -- 2.7.4
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