dm table: make 'struct dm_table' definition accessible to all of DM core

Move 'struct dm_table' definition from dm-table.c to dm-core.h and
update DM core to access its members directly.

Helps optimize max_io_len() and other methods slightly.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-core.h

@@ -11,6 +11,7 @@
 
 #include <linux/kthread.h>
 #include <linux/ktime.h>
+#include <linux/genhd.h>
 #include <linux/blk-mq.h>
 
 #include <trace/events/block.h>
@@ -25,9 +26,11 @@ struct dm_kobject_holder {
 };
 
 /*
- * DM core internal structure that used directly by dm.c and dm-rq.c
- * DM targets must _not_ deference a mapped_device to directly access its members!
+ * DM core internal structures used directly by dm.c, dm-rq.c and dm-table.c.
+ * DM targets must _not_ deference a mapped_device or dm_table to directly
+ * access their members!
  */
+
 struct mapped_device {
 	struct mutex suspend_lock;
 
@@ -119,6 +122,55 @@ void disable_discard(struct mapped_device *md);
 void disable_write_same(struct mapped_device *md);
 void disable_write_zeroes(struct mapped_device *md);
 
+static inline sector_t dm_get_size(struct mapped_device *md)
+{
+	return get_capacity(md->disk);
+}
+
+static inline struct dm_stats *dm_get_stats(struct mapped_device *md)
+{
+	return &md->stats;
+}
+
+#define DM_TABLE_MAX_DEPTH 16
+
+struct dm_table {
+	struct mapped_device *md;
+	enum dm_queue_mode type;
+
+	/* btree table */
+	unsigned int depth;
+	unsigned int counts[DM_TABLE_MAX_DEPTH]; /* in nodes */
+	sector_t *index[DM_TABLE_MAX_DEPTH];
+
+	unsigned int num_targets;
+	unsigned int num_allocated;
+	sector_t *highs;
+	struct dm_target *targets;
+
+	struct target_type *immutable_target_type;
+
+	bool integrity_supported:1;
+	bool singleton:1;
+	unsigned integrity_added:1;
+
+	/*
+	 * Indicates the rw permissions for the new logical
+	 * device.  This should be a combination of FMODE_READ
+	 * and FMODE_WRITE.
+	 */
+	fmode_t mode;
+
+	/* a list of devices used by this table */
+	struct list_head devices;
+
+	/* events get handed up using this callback */
+	void (*event_fn)(void *);
+	void *event_context;
+
+	struct dm_md_mempools *mempools;
+};
+
 static inline struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
 {
 	return &container_of(kobj, struct dm_kobject_holder, kobj)->completion;

drivers/md/dm-rq.c

@@ -175,7 +175,7 @@ static void __dm_mq_kick_requeue_list(struct request_queue *q, unsigned long mse
 
 void dm_mq_kick_requeue_list(struct mapped_device *md)
 {
-	__dm_mq_kick_requeue_list(dm_get_md_queue(md), 0);
+	__dm_mq_kick_requeue_list(md->queue, 0);
 }
 EXPORT_SYMBOL(dm_mq_kick_requeue_list);
 

drivers/md/dm-table.c

@@ -25,48 +25,10 @@
 
 #define DM_MSG_PREFIX "table"
 
-#define MAX_DEPTH 16
 #define NODE_SIZE L1_CACHE_BYTES
 #define KEYS_PER_NODE (NODE_SIZE / sizeof(sector_t))
 #define CHILDREN_PER_NODE (KEYS_PER_NODE + 1)
 
-struct dm_table {
-	struct mapped_device *md;
-	enum dm_queue_mode type;
-
-	/* btree table */
-	unsigned int depth;
-	unsigned int counts[MAX_DEPTH];	/* in nodes */
-	sector_t *index[MAX_DEPTH];
-
-	unsigned int num_targets;
-	unsigned int num_allocated;
-	sector_t *highs;
-	struct dm_target *targets;
-
-	struct target_type *immutable_target_type;
-
-	bool integrity_supported:1;
-	bool singleton:1;
-	unsigned integrity_added:1;
-
-	/*
-	 * Indicates the rw permissions for the new logical
-	 * device.  This should be a combination of FMODE_READ
-	 * and FMODE_WRITE.
-	 */
-	fmode_t mode;
-
-	/* a list of devices used by this table */
-	struct list_head devices;
-
-	/* events get handed up using this callback */
-	void (*event_fn)(void *);
-	void *event_context;
-
-	struct dm_md_mempools *mempools;
-};
-
 /*
  * Similar to ceiling(log_size(n))
  */
@@ -2085,16 +2047,11 @@ EXPORT_SYMBOL_GPL(dm_table_device_name);
 
 void dm_table_run_md_queue_async(struct dm_table *t)
 {
-	struct mapped_device *md;
-	struct request_queue *queue;
-
 	if (!dm_table_request_based(t))
 		return;
 
-	md = dm_table_get_md(t);
-	queue = dm_get_md_queue(md);
-	if (queue)
-		blk_mq_run_hw_queues(queue, true);
+	if (t->md->queue)
+		blk_mq_run_hw_queues(t->md->queue, true);
 }
 EXPORT_SYMBOL(dm_table_run_md_queue_async);
 

drivers/md/dm.c

@@ -422,21 +422,6 @@ static void do_deferred_remove(struct work_struct *w)
 	dm_deferred_remove();
 }
 
-sector_t dm_get_size(struct mapped_device *md)
-{
-	return get_capacity(md->disk);
-}
-
-struct request_queue *dm_get_md_queue(struct mapped_device *md)
-{
-	return md->queue;
-}
-
-struct dm_stats *dm_get_stats(struct mapped_device *md)
-{
-	return &md->stats;
-}
-
 static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 {
 	struct mapped_device *md = bdev->bd_disk->private_data;
@@ -1057,7 +1042,7 @@ static sector_t max_io_len(struct dm_target *ti, sector_t sector)
 	 *   blk_max_size_offset() provides required splitting.
 	 * - blk_max_size_offset() also respects q->limits.max_sectors
 	 */
-	max_len = blk_max_size_offset(dm_table_get_md(ti->table)->queue,
+	max_len = blk_max_size_offset(ti->table->md->queue,
 				      target_offset);
 	if (len > max_len)
 		len = max_len;
@@ -2931,19 +2916,19 @@ int dm_test_deferred_remove_flag(struct mapped_device *md)
 
 int dm_suspended(struct dm_target *ti)
 {
-	return dm_suspended_md(dm_table_get_md(ti->table));
+	return dm_suspended_md(ti->table->md);
 }
 EXPORT_SYMBOL_GPL(dm_suspended);
 
 int dm_post_suspending(struct dm_target *ti)
 {
-	return dm_post_suspending_md(dm_table_get_md(ti->table));
+	return dm_post_suspending_md(ti->table->md);
 }
 EXPORT_SYMBOL_GPL(dm_post_suspending);
 
 int dm_noflush_suspending(struct dm_target *ti)
 {
-	return __noflush_suspending(dm_table_get_md(ti->table));
+	return __noflush_suspending(ti->table->md);
 }
 EXPORT_SYMBOL_GPL(dm_noflush_suspending);
 

drivers/md/dm.h

@@ -179,12 +179,9 @@ int dm_open_count(struct mapped_device *md);
 int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
 int dm_cancel_deferred_remove(struct mapped_device *md);
 int dm_request_based(struct mapped_device *md);
-sector_t dm_get_size(struct mapped_device *md);
-struct request_queue *dm_get_md_queue(struct mapped_device *md);
 int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
 			struct dm_dev **result);
 void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
-struct dm_stats *dm_get_stats(struct mapped_device *md);
 
 int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
 		      unsigned cookie);