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authorMike Snitzer <snitzer@redhat.com>2014-12-16 12:54:25 -0500
committerJens Axboe <axboe@fb.com>2015-01-28 09:44:33 -0700
commitad9cf3bbd18a94806314741ac8092c3422f5aebe (patch)
tree85b1b24402535ca8322495915b9e50fe3be7494d /include/linux/blkdev.h
parent77a086890173c0958515f7322880e4680cf12f8e (diff)
block: mark blk-mq devices as stackable
Commit 4ee5eaf4 ("block: add a queue flag for request stacking support") introduced the concept of "STACKABLE" and blk-mq devices fit the definition in that they establish q->request_fn. So establish QUEUE_FLAG_STACKABLE in QUEUE_FLAG_MQ_DEFAULT. While not strictly needed (DM _could_ just check for q->mq_ops to assume the device is request-based), request-based DM support for blk-mq devices benefits from the ability to consistently check for QUEUE_FLAG_STACKABLE before allowing a device to be stacked into a request-based DM table. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/blkdev.h')
-rw-r--r--include/linux/blkdev.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 6f388fd1c11c..13e16401a7ce 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -520,6 +520,7 @@ struct request_queue {
(1 << QUEUE_FLAG_ADD_RANDOM))
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
+ (1 << QUEUE_FLAG_STACKABLE) | \
(1 << QUEUE_FLAG_SAME_COMP))
static inline void queue_lockdep_assert_held(struct request_queue *q)