commit d82ae52e68892338068e7559a0c0657193341ce4
author Mike Snitzer <snitzer@redhat.com> Fri Oct 18 09:44:49 2013 -0600
committer Jens Axboe <axboe@kernel.dk> Fri Nov 08 09:00:17 2013 -0700
tree aab870f6e8b0dfdddade4b0f2e738b37e388c94c
parent 7c8a3679e3d8e9d92d58f282161760a0e247df97

block: properly stack underlying max_segment_size to DM device

Without this patch all DM devices will default to BLK_MAX_SEGMENT_SIZE
(65536) even if the underlying device(s) have a larger value -- this is
due to blk_stack_limits() using min_not_zero() when stacking the
max_segment_size limit.

1073741824

before patch:
65536

after patch:
1073741824

Reported-by: Lukasz Flis <l.flis@cyfronet.pl>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.3+
Signed-off-by: Jens Axboe <axboe@kernel.dk>