[PATCH v3 2/9] block: introduce flag of QUEUE_FLAG_QUIESCED

[Ming Lei]

This flag is introduced for improving the quiescing code.

Signed-off-by: Ming Lei <ming....@redhat.com>
---
 include/linux/blkdev.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 41291be82ac4..60967797f4f6 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -618,6 +618,7 @@ struct request_queue {
 #define QUEUE_FLAG_STATS       27      /* track rq completion times */
 #define QUEUE_FLAG_POLL_STATS  28      /* collecting stats for hybrid polling 
*/
 #define QUEUE_FLAG_REGISTERED  29      /* queue has been registered to a disk 
*/
+#define QUEUE_FLAG_QUIESCED    30      /* queue has been quiesced */
 
 #define QUEUE_FLAG_DEFAULT     ((1 << QUEUE_FLAG_IO_STAT) |            \
                                 (1 << QUEUE_FLAG_STACKABLE)    |       \
@@ -712,6 +713,7 @@ static inline void queue_flag_clear(unsigned int flag, 
struct request_queue *q)
 #define blk_noretry_request(rq) \
        ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
                             REQ_FAILFAST_DRIVER))
+#define blk_queue_quiesced(q)  test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
 
 static inline bool blk_account_rq(struct request *rq)
 {
-- 
2.9.4