[PATCH 4.9 153/222] block: introduce blk_rq_is_passthrough

[Greg Kroah-Hartman]

From: Christoph Hellwig <hch@xxxxxx>

commit 57292b58ddb58689e8c3b4c6eadbef10d9ca44dd upstream.

This can be used to check for fs vs non-fs requests and basically
removes all knowledge of BLOCK_PC specific from the block layer,
as well as preparing for removing the cmd_type field in struct request.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
[only take the blkdev.h changes as we only want the function for backported
patches - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 include/linux/blkdev.h |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -212,6 +212,11 @@ struct request {
 	(req)->cmd_flags |= flags;		\
 } while (0)
 
+static inline bool blk_rq_is_passthrough(struct request *rq)
+{
+	return rq->cmd_type != REQ_TYPE_FS;
+}
+
 static inline unsigned short req_get_ioprio(struct request *req)
 {
 	return req->ioprio;
@@ -663,7 +668,7 @@ static inline void blk_clear_rl_full(str
 
 static inline bool rq_mergeable(struct request *rq)
 {
-	if (rq->cmd_type != REQ_TYPE_FS)
+	if (blk_rq_is_passthrough(rq))
 		return false;
 
 	if (req_op(rq) == REQ_OP_FLUSH)
@@ -910,7 +915,7 @@ static inline unsigned int blk_rq_get_ma
 {
 	struct request_queue *q = rq->q;
 
-	if (unlikely(rq->cmd_type != REQ_TYPE_FS))
+	if (blk_rq_is_passthrough(rq))
 		return q->limits.max_hw_sectors;
 
 	if (!q->limits.chunk_sectors ||