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(). Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> --- drivers/md/dm-table.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 5edc3079e7c1..248c5a1074a7 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> @@ -1502,6 +1503,10 @@ 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); -- 2.15.0
