Commit c6d6e9b0 authored Dec 18, 2018 by Jaegeuk Kim Committed by Mike Snitzer Dec 18, 2018

dm: do not allow readahead to limit IO size



Update DM to set the bdi's io_pages.  This fixes reads to be capped at
the device's max request size (even if user's read IO exceeds the
established readahead setting).

Fixes: 9491ae4a ("mm: don't cap request size based on read-ahead setting")
Cc: stable@vger.kernel.org
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

parent 74694bcb

drivers/md/dm-table.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1927,6 +1927,9 @@ void dm_table_set_restrictions(struct dm_table t, struct request_queue q,
		*/
		if (blk_queue_is_zoned(q))
		blk_revalidate_disk_zones(t->md->disk);

		/* Allow reads to exceed readahead limits */
		q->backing_dev_info->io_pages = limits->max_sectors >> (PAGE_SHIFT - 9);
		}

		unsigned int dm_table_get_num_targets(struct dm_table *t)