Commit 693b960e authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm cache: simplify get_per_bio_data() by removing data_size argument 



There is only one per_bio_data size now that writethrough-specific data
was removed from the per_bio_data structure.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 9958f1d9

drivers/md/dm-cache-target.c

+22 −39
Original line number Diff line number Diff line
@@ -603,21 +603,16 @@ static unsigned lock_level(struct bio *bio) 
 * Per bio data

 *--------------------------------------------------------------*/



static size_t get_per_bio_data_size(struct cache *cache)

static struct per_bio_data *get_per_bio_data(struct bio *bio)

{

	return sizeof(struct per_bio_data);

}



static struct per_bio_data *get_per_bio_data(struct bio *bio, size_t data_size)

{

	struct per_bio_data *pb = dm_per_bio_data(bio, data_size);

	struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));

	BUG_ON(!pb);

	return pb;

}



static struct per_bio_data *init_per_bio_data(struct bio *bio, size_t data_size)

static struct per_bio_data *init_per_bio_data(struct bio *bio)

{

	struct per_bio_data *pb = get_per_bio_data(bio, data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	pb->tick = false;

	pb->req_nr = dm_bio_get_target_bio_nr(bio);
@@ -657,7 +652,6 @@ static void defer_bios(struct cache *cache, struct bio_list *bios) 
static bool bio_detain_shared(struct cache *cache, dm_oblock_t oblock, struct bio *bio)

{

	bool r;

	size_t pb_size;

	struct per_bio_data *pb;

	struct dm_cell_key_v2 key;

	dm_oblock_t end = to_oblock(from_oblock(oblock) + 1ULL);
@@ -682,8 +676,7 @@ static bool bio_detain_shared(struct cache *cache, dm_oblock_t oblock, struct bi 
	if (cell != cell_prealloc)

		free_prison_cell(cache, cell_prealloc);



	pb_size = get_per_bio_data_size(cache);

	pb = get_per_bio_data(bio, pb_size);

	pb = get_per_bio_data(bio);

	pb->cell = cell;



	return r;
@@ -835,12 +828,12 @@ static void remap_to_cache(struct cache *cache, struct bio *bio, 
static void check_if_tick_bio_needed(struct cache *cache, struct bio *bio)

{

	unsigned long flags;

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb;



	spin_lock_irqsave(&cache->lock, flags);

	if (cache->need_tick_bio && !op_is_flush(bio->bi_opf) &&

	    bio_op(bio) != REQ_OP_DISCARD) {

		pb = get_per_bio_data(bio);

		pb->tick = true;

		cache->need_tick_bio = false;

	}
@@ -894,10 +887,10 @@ static bool accountable_bio(struct cache *cache, struct bio *bio) 


static void accounted_begin(struct cache *cache, struct bio *bio)

{

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb;



	if (accountable_bio(cache, bio)) {

		pb = get_per_bio_data(bio);

		pb->len = bio_sectors(bio);

		iot_io_begin(&cache->tracker, pb->len);

	}
@@ -905,8 +898,7 @@ static void accounted_begin(struct cache *cache, struct bio *bio) 


static void accounted_complete(struct cache *cache, struct bio *bio)

{

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	iot_io_end(&cache->tracker, pb->len);

}
@@ -1215,8 +1207,7 @@ static int copy(struct dm_cache_migration *mg, bool promote) 


static void bio_drop_shared_lock(struct cache *cache, struct bio *bio)

{

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	if (pb->cell && dm_cell_put_v2(cache->prison, pb->cell))

		free_prison_cell(cache, pb->cell);
@@ -1227,23 +1218,21 @@ static void overwrite_endio(struct bio *bio) 
{

	struct dm_cache_migration *mg = bio->bi_private;

	struct cache *cache = mg->cache;

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	dm_unhook_bio(&pb->hook_info, bio);



	if (bio->bi_status)

		mg->k.input = bio->bi_status;



	queue_continuation(mg->cache->wq, &mg->k);

	queue_continuation(cache->wq, &mg->k);

}



static void overwrite(struct dm_cache_migration *mg,

		      void (*continuation)(struct work_struct *))

{

	struct bio *bio = mg->overwrite_bio;

	size_t pb_data_size = get_per_bio_data_size(mg->cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	dm_hook_bio(&pb->hook_info, bio, overwrite_endio, mg);
@@ -1741,8 +1730,6 @@ static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, 
	int r, data_dir;

	bool rb, background_queued;

	dm_cblock_t cblock;

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);



	*commit_needed = false;
@@ -1791,6 +1778,8 @@ static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, 
	}



	if (r == -ENOENT) {

		struct per_bio_data *pb = get_per_bio_data(bio);



		/*

		 * Miss.

		 */
@@ -1798,7 +1787,6 @@ static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, 
		if (pb->req_nr == 0) {

			accounted_begin(cache, bio);

			remap_to_origin_clear_discard(cache, bio, block);



		} else {

			/*

			 * This is a duplicate writethrough io that is no
@@ -1824,7 +1812,6 @@ static int map_bio(struct cache *cache, struct bio *bio, dm_oblock_t block, 
				invalidate_start(cache, cblock, block, bio);

			} else

				remap_to_origin_clear_discard(cache, bio, block);



		} else {

			if (bio_data_dir(bio) == WRITE && writethrough_mode(cache) &&

			    !is_dirty(cache, cblock)) {
@@ -1897,8 +1884,7 @@ static blk_status_t commit_op(void *context) 


static bool process_flush_bio(struct cache *cache, struct bio *bio)

{

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	if (!pb->req_nr)

		remap_to_origin(cache, bio);
@@ -2511,9 +2497,9 @@ static int cache_create(struct cache_args *ca, struct cache **result) 
	ti->discards_supported = true;

	ti->split_discard_bios = false;



	cache->features = ca->features;

	ti->per_io_data_size = get_per_bio_data_size(cache);

	ti->per_io_data_size = sizeof(struct per_bio_data);



	cache->features = ca->features;

	if (writethrough_mode(cache)) {

		/* Create bioset for writethrough bios issued to origin */

		cache->bs = bioset_create(BIO_POOL_SIZE, 0, 0);
@@ -2755,9 +2741,8 @@ static int cache_map(struct dm_target *ti, struct bio *bio) 
	int r;

	bool commit_needed;

	dm_oblock_t block = get_bio_block(cache, bio);

	size_t pb_data_size = get_per_bio_data_size(cache);



	init_per_bio_data(bio, pb_data_size);

	init_per_bio_data(bio);

	if (unlikely(from_oblock(block) >= from_oblock(cache->origin_blocks))) {

		/*

		 * This can only occur if the io goes to a partial block at
@@ -2781,13 +2766,11 @@ static int cache_map(struct dm_target *ti, struct bio *bio) 
	return r;

}



static int cache_end_io(struct dm_target *ti, struct bio *bio,

		blk_status_t *error)

static int cache_end_io(struct dm_target *ti, struct bio *bio, blk_status_t *error)

{

	struct cache *cache = ti->private;

	unsigned long flags;

	size_t pb_data_size = get_per_bio_data_size(cache);

	struct per_bio_data *pb = get_per_bio_data(bio, pb_data_size);

	struct per_bio_data *pb = get_per_bio_data(bio);



	if (pb->tick) {

		policy_tick(cache->policy, false);

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