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authorKeith Busch <keith.busch@intel.com>2015-01-24 15:10:49 -0700
committerMike Snitzer <snitzer@redhat.com>2015-02-11 10:25:46 -0500
commita4afe76b2b922e6197944d7be0be7a18b53175ae (patch)
tree8987fb59e627198bbfbb2c425b47a7880fed369a /drivers/md/dm-table.c
parent0c8f86322f4debca6dc899603e56397a6ae7c2dc (diff)
dm: inherit QUEUE_FLAG_SG_GAPS flags from underlying queues
A DM device must inherit the QUEUE_FLAG_SG_GAPS flags from its underlying block devices' request queues. This fixes problems when submitting cloned requests to multipathed devices requiring virtually contiguous buffers. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-table.c')
-rw-r--r--drivers/md/dm-table.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 14954d844668..6554d9148927 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1389,6 +1389,14 @@ static int queue_supports_sg_merge(struct dm_target *ti, struct dm_dev *dev,
return q && !test_bit(QUEUE_FLAG_NO_SG_MERGE, &q->queue_flags);
}
+static int queue_supports_sg_gaps(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data)
+{
+ struct request_queue *q = bdev_get_queue(dev->bdev);
+
+ return q && !test_bit(QUEUE_FLAG_SG_GAPS, &q->queue_flags);
+}
+
static bool dm_table_all_devices_attribute(struct dm_table *t,
iterate_devices_callout_fn func)
{
@@ -1509,6 +1517,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
else
queue_flag_set_unlocked(QUEUE_FLAG_NO_SG_MERGE, q);
+ if (dm_table_all_devices_attribute(t, queue_supports_sg_gaps))
+ queue_flag_clear_unlocked(QUEUE_FLAG_SG_GAPS, q);
+ else
+ queue_flag_set_unlocked(QUEUE_FLAG_SG_GAPS, q);
+
dm_table_set_integrity(t);
/*