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dm: disable WRITE SAME

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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>
This commit is contained in:
Mike Snitzer 2012-12-21 20:23:30 +00:00 committed by Alasdair G Kergon
parent e910d7ebec
commit c1a94672a8
1 changed files with 2 additions and 0 deletions
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2
drivers/md/dm-table.c
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@ -1445,6 +1445,8 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
else else
queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q); queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
q->limits.max_write_same_sectors = 0;
dm_table_set_integrity(t); dm_table_set_integrity(t);
/* /*