| From c1a94672a830e01d58c7c7e8de530c3f136d6ff2 Mon Sep 17 00:00:00 2001 |
| From: Mike Snitzer <snitzer@redhat.com> |
| Date: Fri, 21 Dec 2012 20:23:30 +0000 |
| Subject: dm: disable WRITE SAME |
| |
| From: Mike Snitzer <snitzer@redhat.com> |
| |
| commit c1a94672a830e01d58c7c7e8de530c3f136d6ff2 upstream. |
| |
| 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: Milan Broz <mbroz@redhat.com> |
| Signed-off-by: Alasdair G Kergon <agk@redhat.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/md/dm-table.c | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| --- a/drivers/md/dm-table.c |
| +++ b/drivers/md/dm-table.c |
| @@ -1445,6 +1445,8 @@ void dm_table_set_restrictions(struct dm |
| else |
| queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q); |
| |
| + q->limits.max_write_same_sectors = 0; |
| + |
| dm_table_set_integrity(t); |
| |
| /* |
