s390/dasd: fix performance drop

commit 12d319b920fa673a4d5e7c1785c5dc82dcd15257 upstream.

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>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index a263c10359e1553f007a1a031e8b76733c463109..4abfbdb285ec3181d19cf80c7fe4588ee8081759 100644 (file)
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -3031,6 +3031,7 @@ 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);