[PATCH 02/51] block: Use enum req_op where appropriate

[Bart Van Assche <bvanassche@acm.org>]

Change the type of the arguments that are used to pass a REQ_OP_* value
from int or unsigned int into enum req_op to improve static type
checking.

Note: the type of the blk_mq_alloc_request() 'op' argument is not
modified by this patch since at least once caller passes an operation
and flags in this argument.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 block/blk-core.c          | 6 +++---
 block/blk-mq-debugfs.c    | 2 +-
 block/blk-mq.c            | 2 +-
 block/blk-wbt.c           | 2 +-
 block/blk.h               | 2 +-
 include/linux/blk-mq.h    | 2 +-
 include/linux/blk_types.h | 2 +-
 include/linux/blkdev.h    | 6 +++---
 8 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index eb86c756a7fd..9d420dff90f6 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -136,7 +136,7 @@ static const char *const blk_op_name[] = {
  * string format. Useful in the debugging and tracing bio or request. For
  * invalid REQ_OP_XXX it returns string "UNKNOWN".
  */
-inline const char *blk_op_str(unsigned int op)
+inline const char *blk_op_str(enum req_op op)
 {
 	const char *op_str = "UNKNOWN";
 
@@ -1010,7 +1010,7 @@ void update_io_ticks(struct block_device *part, unsigned long now, bool end)
 }
 
 unsigned long bdev_start_io_acct(struct block_device *bdev,
-				 unsigned int sectors, unsigned int op,
+				 unsigned int sectors, enum req_op op,
 				 unsigned long start_time)
 {
 	const int sgrp = op_stat_group(op);
@@ -1051,7 +1051,7 @@ unsigned long bio_start_io_acct(struct bio *bio)
 }
 EXPORT_SYMBOL_GPL(bio_start_io_acct);
 
-void bdev_end_io_acct(struct block_device *bdev, unsigned int op,
+void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
 		      unsigned long start_time)
 {
 	const int sgrp = op_stat_group(op);
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 7e4136a60e1c..df0b9a458f34 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -306,7 +306,7 @@ static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
 {
 	const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
-	const unsigned int op = req_op(rq);
+	const enum req_op op = req_op(rq);
 	const char *op_str = blk_op_str(op);
 
 	seq_printf(m, "%p {.op=", rq);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index f5cce377f1a8..50fc1194ebc0 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -538,7 +538,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
 EXPORT_SYMBOL(blk_mq_alloc_request);
 
 struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
-	unsigned int op, blk_mq_req_flags_t flags, unsigned int hctx_idx)
+	enum req_op op, blk_mq_req_flags_t flags, unsigned int hctx_idx)
 {
 	struct blk_mq_alloc_data data = {
 		.q		= q,
diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index 0c119be0e813..7bf09ae06577 100644
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -670,7 +670,7 @@ u64 wbt_default_latency_nsec(struct request_queue *q)
 
 static int wbt_data_dir(const struct request *rq)
 {
-	const int op = req_op(rq);
+	const enum req_op op = req_op(rq);
 
 	if (op == REQ_OP_READ)
 		return READ;
diff --git a/block/blk.h b/block/blk.h
index 8e79296ee97a..13b43fb28b9f 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -160,7 +160,7 @@ static inline bool blk_discard_mergable(struct request *req)
 }
 
 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
-						     int op)
+						     enum req_op op)
 {
 	if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
 		return min(q->limits.max_discard_sectors,
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index e2d9daf7e8dd..45d69cc46dc7 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -713,7 +713,7 @@ enum {
 struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
 		blk_mq_req_flags_t flags);
 struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
-		unsigned int op, blk_mq_req_flags_t flags,
+		enum req_op op, blk_mq_req_flags_t flags,
 		unsigned int hctx_idx);
 
 /*
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 0e6a2af7ed3d..cce8768bc00b 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -522,7 +522,7 @@ static inline bool op_is_zone_mgmt(enum req_op op)
 	}
 }
 
-static inline int op_stat_group(unsigned int op)
+static inline int op_stat_group(enum req_op op)
 {
 	if (op_is_discard(op))
 		return STAT_DISCARD;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 94ceed805e76..3f8ee0608d60 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -886,7 +886,7 @@ extern void blk_queue_exit(struct request_queue *q);
 extern void blk_sync_queue(struct request_queue *q);
 
 /* Helper to convert REQ_OP_XXX to its string format XXX */
-extern const char *blk_op_str(unsigned int op);
+extern const char *blk_op_str(enum req_op op);
 
 int blk_status_to_errno(blk_status_t status);
 blk_status_t errno_to_blk_status(int errno);
@@ -1472,9 +1472,9 @@ static inline void blk_wake_io_task(struct task_struct *waiter)
 }
 
 unsigned long bdev_start_io_acct(struct block_device *bdev,
-				 unsigned int sectors, unsigned int op,
+				 unsigned int sectors, enum req_op op,
 				 unsigned long start_time);
-void bdev_end_io_acct(struct block_device *bdev, unsigned int op,
+void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
 		unsigned long start_time);
 
 void bio_start_io_acct_time(struct bio *bio, unsigned long start_time);