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path: root/drivers/md/dm-table.c
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Diffstat (limited to 'drivers/md/dm-table.c')
-rw-r--r--drivers/md/dm-table.c72
1 files changed, 57 insertions, 15 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 3afae9e062f8..6554d9148927 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -827,10 +827,11 @@ static int dm_table_set_type(struct dm_table *t)
{
unsigned i;
unsigned bio_based = 0, request_based = 0, hybrid = 0;
+ bool use_blk_mq = false;
struct dm_target *tgt;
struct dm_dev_internal *dd;
struct list_head *devices;
- unsigned live_md_type;
+ unsigned live_md_type = dm_get_md_type(t->md);
for (i = 0; i < t->num_targets; i++) {
tgt = t->targets + i;
@@ -854,8 +855,8 @@ static int dm_table_set_type(struct dm_table *t)
* Determine the type from the live device.
* Default to bio-based if device is new.
*/
- live_md_type = dm_get_md_type(t->md);
- if (live_md_type == DM_TYPE_REQUEST_BASED)
+ if (live_md_type == DM_TYPE_REQUEST_BASED ||
+ live_md_type == DM_TYPE_MQ_REQUEST_BASED)
request_based = 1;
else
bio_based = 1;
@@ -869,16 +870,6 @@ static int dm_table_set_type(struct dm_table *t)
BUG_ON(!request_based); /* No targets in this table */
- /* Non-request-stackable devices can't be used for request-based dm */
- devices = dm_table_get_devices(t);
- list_for_each_entry(dd, devices, list) {
- if (!blk_queue_stackable(bdev_get_queue(dd->dm_dev->bdev))) {
- DMWARN("table load rejected: including"
- " non-request-stackable devices");
- return -EINVAL;
- }
- }
-
/*
* Request-based dm supports only tables that have a single target now.
* To support multiple targets, request splitting support is needed,
@@ -890,7 +881,37 @@ static int dm_table_set_type(struct dm_table *t)
return -EINVAL;
}
- t->type = DM_TYPE_REQUEST_BASED;
+ /* Non-request-stackable devices can't be used for request-based dm */
+ devices = dm_table_get_devices(t);
+ list_for_each_entry(dd, devices, list) {
+ struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev);
+
+ if (!blk_queue_stackable(q)) {
+ DMERR("table load rejected: including"
+ " non-request-stackable devices");
+ return -EINVAL;
+ }
+
+ if (q->mq_ops)
+ use_blk_mq = true;
+ }
+
+ if (use_blk_mq) {
+ /* verify _all_ devices in the table are blk-mq devices */
+ list_for_each_entry(dd, devices, list)
+ if (!bdev_get_queue(dd->dm_dev->bdev)->mq_ops) {
+ DMERR("table load rejected: not all devices"
+ " are blk-mq request-stackable");
+ return -EINVAL;
+ }
+ t->type = DM_TYPE_MQ_REQUEST_BASED;
+
+ } else if (hybrid && list_empty(devices) && live_md_type != DM_TYPE_NONE) {
+ /* inherit live MD type */
+ t->type = live_md_type;
+
+ } else
+ t->type = DM_TYPE_REQUEST_BASED;
return 0;
}
@@ -907,7 +928,15 @@ struct target_type *dm_table_get_immutable_target_type(struct dm_table *t)
bool dm_table_request_based(struct dm_table *t)
{
- return dm_table_get_type(t) == DM_TYPE_REQUEST_BASED;
+ unsigned table_type = dm_table_get_type(t);
+
+ return (table_type == DM_TYPE_REQUEST_BASED ||
+ table_type == DM_TYPE_MQ_REQUEST_BASED);
+}
+
+bool dm_table_mq_request_based(struct dm_table *t)
+{
+ return dm_table_get_type(t) == DM_TYPE_MQ_REQUEST_BASED;
}
static int dm_table_alloc_md_mempools(struct dm_table *t)
@@ -1360,6 +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)
{
@@ -1480,6 +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);
/*