diff options
author | Mike Snitzer <snitzer@redhat.com> | 2014-10-08 18:26:13 -0400 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-14 08:59:51 -0800 |
commit | e851024dbf6c245c858f227a1346aa68580c1e43 (patch) | |
tree | dbce801ef8faebb99a81c620f146d336763bfaef /drivers/md | |
parent | 751f7bc444ef43927b1bce396d5a7313cf6b287a (diff) |
block: fix alignment_offset math that assumes io_min is a power-of-2
commit b8839b8c55f3fdd60dc36abcda7e0266aff7985c upstream.
The math in both blk_stack_limits() and queue_limit_alignment_offset()
assume that a block device's io_min (aka minimum_io_size) is always a
power-of-2. Fix the math such that it works for non-power-of-2 io_min.
This issue (of alignment_offset != 0) became apparent when testing
dm-thinp with a thinp blocksize that matches a RAID6 stripesize of
1280K. Commit fdfb4c8c1 ("dm thin: set minimum_io_size to pool's data
block size") unlocked the potential for alignment_offset != 0 due to
the dm-thin-pool's io_min possibly being a non-power-of-2.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
0 files changed, 0 insertions, 0 deletions