diff mbox

[v2,10/13] dm: Introduce enum dm_queue_mode

Message ID 20170427171126.26814-11-bart.vanassche@sandisk.com (mailing list archive)
State Accepted, archived
Delegated to: Mike Snitzer
Headers show

Commit Message

Bart Van Assche April 27, 2017, 5:11 p.m. UTC 
Introduce an enumeration type for the queue mode. This patch does
not change any functionality but makes the dm code easier to read.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
---
 drivers/md/dm-core.h          |  2 +-
 drivers/md/dm-ioctl.c         |  2 +-
 drivers/md/dm-mpath.c         |  5 ++++-
 drivers/md/dm-table.c         | 14 +++++++-------
 drivers/md/dm.c               | 14 +++++++++-----
 drivers/md/dm.h               | 12 +++++++-----
 include/linux/device-mapper.h | 14 ++++++++------
 7 files changed, 37 insertions(+), 26 deletions(-)
diff mbox

Patch

diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 136fda3ff9e5..b92f74d9a982 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -47,7 +47,7 @@  struct mapped_device {
 	struct request_queue *queue;
 	int numa_node_id;
 
-	unsigned type;
+	enum dm_queue_mode type;
 	/* Protect queue and type against concurrent access. */
 	struct mutex type_lock;
 
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 4da6fc6b1ffd..9b1ce440fc70 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1268,7 +1268,7 @@  static int populate_table(struct dm_table *table,
 	return dm_table_complete(table);
 }
 
-static bool is_valid_type(unsigned cur, unsigned new)
+static bool is_valid_type(enum dm_queue_mode cur, enum dm_queue_mode new)
 {
 	if (cur == new ||
 	    (cur == DM_TYPE_BIO_BASED && new == DM_TYPE_DAX_BIO_BASED))
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index 4e4d53faf2d4..286d74593b2c 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -90,7 +90,7 @@  struct multipath {
 	atomic_t pg_init_in_progress;	/* Only one pg_init allowed at once */
 	atomic_t pg_init_count;		/* Number of times pg_init called */
 
-	unsigned queue_mode;
+	enum dm_queue_mode queue_mode;
 
 	struct mutex work_mutex;
 	struct work_struct trigger_event;
@@ -1707,6 +1707,9 @@  static void multipath_status(struct dm_target *ti, status_type_t type,
 			case DM_TYPE_MQ_REQUEST_BASED:
 				DMEMIT("queue_mode mq ");
 				break;
+			default:
+				WARN_ON_ONCE(true);
+				break;
 			}
 		}
 	}
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 92dbc85af53a..6692571336c7 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -30,7 +30,7 @@ 
 
 struct dm_table {
 	struct mapped_device *md;
-	unsigned type;
+	enum dm_queue_mode type;
 
 	/* btree table */
 	unsigned int depth;
@@ -821,19 +821,19 @@  void dm_consume_args(struct dm_arg_set *as, unsigned num_args)
 }
 EXPORT_SYMBOL(dm_consume_args);
 
-static bool __table_type_bio_based(unsigned table_type)
+static bool __table_type_bio_based(enum dm_queue_mode table_type)
 {
 	return (table_type == DM_TYPE_BIO_BASED ||
 		table_type == DM_TYPE_DAX_BIO_BASED);
 }
 
-static bool __table_type_request_based(unsigned table_type)
+static bool __table_type_request_based(enum dm_queue_mode table_type)
 {
 	return (table_type == DM_TYPE_REQUEST_BASED ||
 		table_type == DM_TYPE_MQ_REQUEST_BASED);
 }
 
-void dm_table_set_type(struct dm_table *t, unsigned type)
+void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)
 {
 	t->type = type;
 }
@@ -875,7 +875,7 @@  static int dm_table_determine_type(struct dm_table *t)
 	struct dm_target *tgt;
 	struct dm_dev_internal *dd;
 	struct list_head *devices = dm_table_get_devices(t);
-	unsigned live_md_type = dm_get_md_type(t->md);
+	enum dm_queue_mode live_md_type = dm_get_md_type(t->md);
 
 	if (t->type != DM_TYPE_NONE) {
 		/* target already set the table's type */
@@ -984,7 +984,7 @@  static int dm_table_determine_type(struct dm_table *t)
 	return 0;
 }
 
-unsigned dm_table_get_type(struct dm_table *t)
+enum dm_queue_mode dm_table_get_type(struct dm_table *t)
 {
 	return t->type;
 }
@@ -1035,7 +1035,7 @@  bool dm_table_all_blk_mq_devices(struct dm_table *t)
 
 static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *md)
 {
-	unsigned type = dm_table_get_type(t);
+	enum dm_queue_mode type = dm_table_get_type(t);
 	unsigned per_io_data_size = 0;
 	struct dm_target *tgt;
 	unsigned i;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 78706a04bab4..7161c7804363 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1797,13 +1797,13 @@  void dm_unlock_md_type(struct mapped_device *md)
 	mutex_unlock(&md->type_lock);
 }
 
-void dm_set_md_type(struct mapped_device *md, unsigned type)
+void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type)
 {
 	BUG_ON(!mutex_is_locked(&md->type_lock));
 	md->type = type;
 }
 
-unsigned dm_get_md_type(struct mapped_device *md)
+enum dm_queue_mode dm_get_md_type(struct mapped_device *md)
 {
 	return md->type;
 }
@@ -1830,7 +1830,7 @@  EXPORT_SYMBOL_GPL(dm_get_queue_limits);
 int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
 {
 	int r;
-	unsigned type = dm_get_md_type(md);
+	enum dm_queue_mode type = dm_get_md_type(md);
 
 	switch (type) {
 	case DM_TYPE_REQUEST_BASED:
@@ -1861,6 +1861,8 @@  int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
 		if (type == DM_TYPE_DAX_BIO_BASED)
 			queue_flag_set_unlocked(QUEUE_FLAG_DAX, md->queue);
 		break;
+	case DM_TYPE_NONE:
+		WARN_ON_ONCE(true);
 	}
 
 	return 0;
@@ -2546,8 +2548,10 @@  int dm_noflush_suspending(struct dm_target *ti)
 }
 EXPORT_SYMBOL_GPL(dm_noflush_suspending);
 
-struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
-					    unsigned integrity, unsigned per_io_data_size)
+struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md,
+					    enum dm_queue_mode type,
+					    unsigned integrity,
+					    unsigned per_io_data_size)
 {
 	struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
 	unsigned int pool_size = 0;
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index f298b01f7ab3..4b3b8587cb72 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -64,7 +64,7 @@  void dm_table_presuspend_undo_targets(struct dm_table *t);
 void dm_table_postsuspend_targets(struct dm_table *t);
 int dm_table_resume_targets(struct dm_table *t);
 int dm_table_any_congested(struct dm_table *t, int bdi_bits);
-unsigned dm_table_get_type(struct dm_table *t);
+enum dm_queue_mode dm_table_get_type(struct dm_table *t);
 struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
 struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
@@ -76,8 +76,8 @@  struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
 
 void dm_lock_md_type(struct mapped_device *md);
 void dm_unlock_md_type(struct mapped_device *md);
-void dm_set_md_type(struct mapped_device *md, unsigned type);
-unsigned dm_get_md_type(struct mapped_device *md);
+void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
+enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
 struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
 
 int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
@@ -204,8 +204,10 @@  void dm_kcopyd_exit(void);
 /*
  * Mempool operations
  */
-struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, unsigned type,
-					    unsigned integrity, unsigned per_bio_data_size);
+struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md,
+					    enum dm_queue_mode type,
+					    unsigned integrity,
+					    unsigned per_bio_data_size);
 void dm_free_md_mempools(struct dm_md_mempools *pools);
 
 /*
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index a7e6903866fd..9df51dcdcf2a 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -22,11 +22,13 @@  struct bio_vec;
 /*
  * Type of table, mapped_device's mempool and request_queue
  */
-#define DM_TYPE_NONE			0
-#define DM_TYPE_BIO_BASED		1
-#define DM_TYPE_REQUEST_BASED		2
-#define DM_TYPE_MQ_REQUEST_BASED	3
-#define DM_TYPE_DAX_BIO_BASED		4
+enum dm_queue_mode {
+	DM_TYPE_NONE		 = 0,
+	DM_TYPE_BIO_BASED	 = 1,
+	DM_TYPE_REQUEST_BASED	 = 2,
+	DM_TYPE_MQ_REQUEST_BASED = 3,
+	DM_TYPE_DAX_BIO_BASED	 = 4,
+};
 
 typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
 
@@ -464,7 +466,7 @@  void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callback
  * Useful for "hybrid" target (supports both bio-based
  * and request-based).
  */
-void dm_table_set_type(struct dm_table *t, unsigned type);
+void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type);
 
 /*
  * Finally call this to make the table ready for use.