Commit c1a94672 authored Dec 21, 2012 by Mike Snitzer Committed by Alasdair G Kergon Dec 21, 2012

dm: disable WRITE SAME



WRITE SAME bios are not yet handled correctly by device-mapper so
disable their use on device-mapper devices by setting
max_write_same_sectors to zero.

As an example, a ciphertext device is incompatible because the data
gets changed according to the location at which it written and so the
dm crypt target cannot support it.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Cc: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

parent e910d7eb

drivers/md/dm-table.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1445,6 +1445,8 @@ void dm_table_set_restrictions(struct dm_table t, struct request_queue q,
		else
		queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);

		q->limits.max_write_same_sectors = 0;

		dm_table_set_integrity(t);

		/*