Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 091/221] dm: disable WRITE SAME | Date | Tue, 15 Jan 2013 10:50:18 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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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); /*
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