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authorMike Snitzer <snitzer@redhat.com>2014-07-18 17:59:43 -0400
committerMike Snitzer <snitzer@redhat.com>2014-08-01 12:30:35 -0400
commitfdfb4c8c1a9fc8dd8cf8eeb4e3ed83573b375285 (patch)
tree1d74a9957919f623797358268a4cdadfc53dbb19 /drivers/md
parent298a9fa08a1577211d42a75e8fc073baef61e0d9 (diff)
dm thin: set minimum_io_size to pool's data block size
Before, if the block layer's limit stacking didn't establish an optimal_io_size that was compatible with the thin-pool'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 pool_io_hints() to set both minimum_io_size and optimal_io_size to the thin-pool's data block size. This fixes an issue reported where mkfs.xfs would create more XFS Allocation Groups on thinp volumes than on a normal linear LV of comparable size, see: https://bugzilla.redhat.com/show_bug.cgi?id=1003227 Reported-by: Chris Murphy <lists@colorremedies.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-thin.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 0e844a5eca8f..4843801173fe 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3177,7 +3177,7 @@ static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits)
*/
if (io_opt_sectors < pool->sectors_per_block ||
do_div(io_opt_sectors, pool->sectors_per_block)) {
- blk_limits_io_min(limits, 0);
+ blk_limits_io_min(limits, pool->sectors_per_block << SECTOR_SHIFT);
blk_limits_io_opt(limits, pool->sectors_per_block << SECTOR_SHIFT);
}