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dm table: require that request-based DM be layered on blk-mq devices 

Now that request-based DM (multipath) is blk-mq only: this restriction
is required while the legacy request-based IO path still exists.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2018-10-11 17:44:04 -04:00
parent 953923c09f
commit cef6f55a9f
1 changed files with 17 additions and 1 deletions
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18
drivers/md/dm-table.c
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@ -908,10 +908,21 @@ static bool dm_table_supports_dax(struct dm_table *t)
static bool dm_table_does_not_support_partial_completion(struct dm_table *t);
struct verify_rq_based_data {
unsigned sq_count;
unsigned mq_count;
};
static int device_is_rq_based(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);
struct verify_rq_based_data *v = data;
if (q->mq_ops)
v->mq_count++;
else
v->sq_count++;
return queue_is_rq_based(q);
}
@ -920,6 +931,7 @@ static int dm_table_determine_type(struct dm_table *t)
{
unsigned i;
unsigned bio_based = 0, request_based = 0, hybrid = 0;
struct verify_rq_based_data v = {.sq_count = 0, .mq_count = 0};
struct dm_target *tgt;
struct list_head *devices = dm_table_get_devices(t);
enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
@ -1022,10 +1034,14 @@ verify_rq_based:
/* Non-request-stackable devices can't be used for request-based dm */
if (!tgt->type->iterate_devices ||
!tgt->type->iterate_devices(tgt, device_is_rq_based, NULL)) {
!tgt->type->iterate_devices(tgt, device_is_rq_based, &v)) {
DMERR("table load rejected: including non-request-stackable devices");
return -EINVAL;
}
if (v.sq_count > 0) {
DMERR("table load rejected: not all devices are blk-mq request-stackable");
return -EINVAL;
}
return 0;
}