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dm table: simplify dm_table_determine_type()

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Use a single loop instead of two loops to determine whether or not
all_blk_mq has to be set.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Bart Van Assche 2016-11-15 15:33:16 -08:00 committed by Mike Snitzer
parent 301fc3f5ef
commit 5b8c01f74c
1 changed files with 8 additions and 13 deletions
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21
drivers/md/dm-table.c
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@ -871,7 +871,7 @@ static int dm_table_determine_type(struct dm_table *t)
{ {
unsigned i; unsigned i;
unsigned bio_based = 0, request_based = 0, hybrid = 0; unsigned bio_based = 0, request_based = 0, hybrid = 0;
bool verify_blk_mq = false; unsigned sq_count = 0, mq_count = 0;
struct dm_target *tgt; struct dm_target *tgt;
struct dm_dev_internal *dd; struct dm_dev_internal *dd;
struct list_head *devices = dm_table_get_devices(t); struct list_head *devices = dm_table_get_devices(t);
@ -966,20 +966,15 @@ static int dm_table_determine_type(struct dm_table *t)
} }
if (q->mq_ops) if (q->mq_ops)
verify_blk_mq = true; mq_count++;
else
sq_count++;
} }
if (sq_count && mq_count) {
if (verify_blk_mq) { DMERR("table load rejected: not all devices are blk-mq request-stackable");
/* verify _all_ devices in the table are blk-mq devices */ return -EINVAL;
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->all_blk_mq = true;
} }
t->all_blk_mq = mq_count > 0;
if (t->type == DM_TYPE_MQ_REQUEST_BASED && !t->all_blk_mq) { if (t->type == DM_TYPE_MQ_REQUEST_BASED && !t->all_blk_mq) {
DMERR("table load rejected: all devices are not blk-mq request-stackable"); DMERR("table load rejected: all devices are not blk-mq request-stackable");