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authorMike Snitzer <snitzer@redhat.com>2020-09-14 19:02:23 +0300
committerMike Snitzer <snitzer@redhat.com>2020-09-29 23:33:01 +0300
commit882ec4e609c1a6de1836e765905f62de1502ae1e (patch)
treeb9ab981dd874b0729f764d49f3db5537f8c86446 /drivers/md
parent1471308fb5ec4335f9ae9fc65f65048dbe7c336e (diff)
downloadlinux-882ec4e609c1a6de1836e765905f62de1502ae1e.tar.xz
dm table: stack 'chunk_sectors' limit to account for target-specific splitting
If target set ti->max_io_len it must be used when stacking DM device's queue_limits to establish a 'chunk_sectors' that is compatible with the IO stack. By using lcm_not_zero() care is taken to avoid blindly overriding the chunk_sectors limit stacked up by blk_stack_limits(). Depends-on: 07d098e6bbad ("block: allow 'chunk_sectors' to be non-power-of-2") Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-table.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index c3be7cb2570c..704345e95cc1 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -18,6 +18,7 @@
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/atomic.h>
+#include <linux/lcm.h>
#include <linux/blk-mq.h>
#include <linux/mount.h>
#include <linux/dax.h>
@@ -1506,6 +1507,10 @@ int dm_calculate_queue_limits(struct dm_table *table,
zone_sectors = ti_limits.chunk_sectors;
}
+ /* Stack chunk_sectors if target-specific splitting is required */
+ if (ti->max_io_len)
+ ti_limits.chunk_sectors = lcm_not_zero(ti->max_io_len,
+ ti_limits.chunk_sectors);
/* Set I/O hints portion of queue limits */
if (ti->type->io_hints)
ti->type->io_hints(ti, &ti_limits);