blk-mq: remove REQ_END

Pass an explicit parameter for the last request in a batch to ->queue_rq
instead of using a request flag.  Besides being a cleaner and non-stateful
interface this is also required for the next patch, which fixes the blk-mq
I/O submission code to not start a time too early.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

2 files changed, 1 insertions, 3 deletions

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a1e31f274fcd..9c4e306a9217 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -77,7 +77,7 @@ struct blk_mq_tag_set {
         struct list_head        tag_list;
 };
 
-typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
+typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *, bool);
 typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
 typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
 typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 66c2167f04a9..bb7d66460e7a 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -188,7 +188,6 @@ enum rq_flag_bits {
         __REQ_MIXED_MERGE,      /* merge of different types, fail separately */
         __REQ_KERNEL,           /* direct IO to kernel pages */
         __REQ_PM,               /* runtime pm request */
-        __REQ_END,              /* last of chain of requests */
         __REQ_HASHED,           /* on IO scheduler merge hash */
         __REQ_MQ_INFLIGHT,      /* track inflight for MQ */
         __REQ_NR_BITS,          /* stops here */
@@ -242,7 +241,6 @@ enum rq_flag_bits {
 #define REQ_SECURE              (1ULL << __REQ_SECURE)
 #define REQ_KERNEL              (1ULL << __REQ_KERNEL)
 #define REQ_PM                  (1ULL << __REQ_PM)
-#define REQ_END                 (1ULL << __REQ_END)
 #define REQ_HASHED              (1ULL << __REQ_HASHED)
 #define REQ_MQ_INFLIGHT         (1ULL << __REQ_MQ_INFLIGHT)