s390/dasd: fix performance drop

Commit ca369d51b ("sd: Fix device-imposed transfer length limits")
introduced a new queue limit max_dev_sectors which limits the maximum
sectors for requests. The default value leads to small dasd requests
and therefor to a performance drop.
Set the max_dev_sectors value to the same value as the max_hw_sectors
to use the maximum available request size for DASD devices.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 41605dac8309..c78db05e75b1 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -3035,6 +3035,7 @@ static void dasd_setup_queue(struct dasd_block *block)
                 max = block->base->discipline->max_blocks << block->s2b_shift;
         }
         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, block->request_queue);
+        block->request_queue->limits.max_dev_sectors = max;
         blk_queue_logical_block_size(block->request_queue,
                                      block->bp_block);
         blk_queue_max_hw_sectors(block->request_queue, max);