From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 18 Oct 2013 15:44:49 +0000 (-0600)
Subject: block: properly stack underlying max_segment_size to DM device
X-Git-Tag: v3.13-rc1~101^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d82ae52e68892338068e7559a0c0657193341ce4;p=pandora-kernel.git

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>
---

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