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Commit 8f50e358 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe
Browse files

dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE 



For BIO based DM, some targets aren't ready for dealing with bigger
incoming bio than 1Mbyte, such as crypt target.

Cc: Mike Snitzer <snitzer@redhat.com>
Cc:dm-devel@redhat.com
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 3c892a09

drivers/md/dm.c

+9 −1
Original line number Diff line number Diff line
@@ -920,7 +920,15 @@ int dm_set_target_max_io_len(struct dm_target *ti, sector_t len) 
		return -EINVAL;

	}



	ti->max_io_len = (uint32_t) len;

	/*

	 * BIO based queue uses its own splitting. When multipage bvecs

	 * is switched on, size of the incoming bio may be too big to

	 * be handled in some targets, such as crypt.

	 *

	 * When these targets are ready for the big bio, we can remove

	 * the limit.

	 */

	ti->max_io_len = min_t(uint32_t, len, BIO_MAX_PAGES * PAGE_SIZE);



	return 0;

}