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-rw-r--r--block/blk-core.c3
-rw-r--r--include/linux/blkdev.h3
2 files changed, 5 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index b8ffbfe..fa21234 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -574,7 +574,8 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
q->request_fn = rfn;
q->prep_rq_fn = NULL;
q->unplug_fn = generic_unplug_device;
- q->queue_flags = (1 << QUEUE_FLAG_CLUSTER);
+ q->queue_flags = (1 << QUEUE_FLAG_CLUSTER |
+ 1 << QUEUE_FLAG_STACKABLE);
q->queue_lock = lock;
blk_queue_segment_boundary(q, 0xffffffff);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 964c246..86f77ef 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -441,6 +441,7 @@ struct request_queue
#define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */
#define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */
+#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
static inline int queue_is_locked(struct request_queue *q)
{
@@ -547,6 +548,8 @@ enum {
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_flushing(q) ((q)->ordseq)
+#define blk_queue_stackable(q) \
+ test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
#define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
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