diff options
| author | Mike Snitzer <snitzer@redhat.com> | 2014-12-16 20:54:25 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-01-28 19:44:33 +0300 |
| commit | ad9cf3bbd18a94806314741ac8092c3422f5aebe (patch) | |
| tree | 85b1b24402535ca8322495915b9e50fe3be7494d /include/linux/blkdev.h | |
| parent | 77a086890173c0958515f7322880e4680cf12f8e (diff) | |
| download | linux-ad9cf3bbd18a94806314741ac8092c3422f5aebe.tar.xz | |
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.h | 1 |
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) |