Commit 33bd6f06 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

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: default avatarMike Snitzer <snitzer@redhat.com>
parent 7465d7ac

drivers/md/dm-core.h

+54 −2
Original line number Diff line number Diff line
@@ -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

+1 −1
Original line number Diff line number Diff line
@@ -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

+2 −45
Original line number Diff line number Diff line
@@ -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

+4 −19
Original line number Diff line number Diff line
@@ -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

+0 −3
Original line number Diff line number Diff line
@@ -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);

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