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authorMike Snitzer <snitzer@redhat.com>2014-07-19 13:25:46 -0400
committerMike Snitzer <snitzer@redhat.com>2014-08-01 12:30:36 -0400
commitb02465308f13f3266480275fd143747bfd441a2f (patch)
treebb68d5e7cebb44f8d8b6351fb0510b680921196a /drivers/md
parentfdfb4c8c1a9fc8dd8cf8eeb4e3ed83573b375285 (diff)
downloadlinux-b02465308f13f3266480275fd143747bfd441a2f.tar.bz2
dm cache: set minimum_io_size to cache's data block size
Before, if the block layer's limit stacking didn't establish an optimal_io_size that was compatible with the cache's data block size we'd set optimal_io_size to the data block size and minimum_io_size to 0 (which the block layer adjusts to be physical_block_size). Update cache_io_hints() to set both minimum_io_size and optimal_io_size to the cache's data block size. This fixes an issue where mkfs.xfs would create more XFS Allocation Groups on cache volumes than on a normal linear LV of comparable size. Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-cache-target.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index a54108e1e233..1af40ee209e2 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3094,7 +3094,7 @@ static void cache_io_hints(struct dm_target *ti, struct queue_limits *limits)
*/
if (io_opt_sectors < cache->sectors_per_block ||
do_div(io_opt_sectors, cache->sectors_per_block)) {
- blk_limits_io_min(limits, 0);
+ blk_limits_io_min(limits, cache->sectors_per_block << SECTOR_SHIFT);
blk_limits_io_opt(limits, cache->sectors_per_block << SECTOR_SHIFT);
}
set_discard_limits(cache, limits);