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dm table: stack 'chunk_sectors' limit to account for target-specific splitting

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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: 07d098e6bb ("block: allow 'chunk_sectors' to be non-power-of-2")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2020-09-14 12:02:23 -04:00
parent 1471308fb5
commit 882ec4e609
1 changed files with 5 additions and 0 deletions
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5
drivers/md/dm-table.c
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@ -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);