dm zoned: add device pointer to struct dm_zone

Add a pointer, to the containing device, within struct dm_zone and
kill dmz_zone_to_dev().
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-zoned-metadata.c

@@ -229,16 +229,10 @@ struct dmz_metadata {
  */
 static unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone)
 {
-	unsigned int zone_id;
-
 	if (WARN_ON(!zone))
 		return 0;
 
-	zone_id = zone->id;
-	if (zmd->nr_devs > 1 &&
-	    (zone_id >= zmd->dev[1].zone_offset))
-		zone_id -= zmd->dev[1].zone_offset;
-	return zone_id;
+	return zone->id - zone->dev->zone_offset;
 }
 
 sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
@@ -255,18 +249,6 @@ sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
 	return (sector_t)zone_id << zmd->zone_nr_blocks_shift;
 }
 
-struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone)
-{
-	if (WARN_ON(!zone))
-		return &zmd->dev[0];
-
-	if (zmd->nr_devs > 1 &&
-	    zone->id >= zmd->dev[1].zone_offset)
-		return &zmd->dev[1];
-
-	return &zmd->dev[0];
-}
-
 unsigned int dmz_zone_nr_blocks(struct dmz_metadata *zmd)
 {
 	return zmd->zone_nr_blocks;
@@ -333,7 +315,7 @@ static struct dm_zone *dmz_get(struct dmz_metadata *zmd, unsigned int zone_id)
 }
 
 static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
-				  unsigned int zone_id)
+				  unsigned int zone_id, struct dmz_dev *dev)
 {
 	struct dm_zone *zone = kzalloc(sizeof(struct dm_zone), GFP_KERNEL);
 
@@ -349,6 +331,7 @@ static struct dm_zone *dmz_insert(struct dmz_metadata *zmd,
 	atomic_set(&zone->refcount, 0);
 	zone->id = zone_id;
 	zone->chunk = DMZ_MAP_UNMAPPED;
+	zone->dev = dev;
 
 	return zone;
 }
@@ -1273,7 +1256,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
 
 	/* Read and check the primary super block */
 	zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
-	zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone);
+	zmd->sb[0].dev = zmd->sb[0].zone->dev;
 	ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
 	if (ret) {
 		dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
@@ -1393,7 +1376,7 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
 	int idx = num + dev->zone_offset;
 	struct dm_zone *zone;
 
-	zone = dmz_insert(zmd, idx);
+	zone = dmz_insert(zmd, idx, dev);
 	if (IS_ERR(zone))
 		return PTR_ERR(zone);
 
@@ -1457,7 +1440,7 @@ static int dmz_emulate_zones(struct dmz_metadata *zmd, struct dmz_dev *dev)
 	for(idx = 0; idx < dev->nr_zones; idx++) {
 		struct dm_zone *zone;
 
-		zone = dmz_insert(zmd, idx);
+		zone = dmz_insert(zmd, idx, dev);
 		if (IS_ERR(zone))
 			return PTR_ERR(zone);
 		set_bit(DMZ_CACHE, &zone->flags);
@@ -1583,7 +1566,7 @@ static int dmz_update_zone_cb(struct blk_zone *blkz, unsigned int idx,
  */
 static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 {
-	struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+	struct dmz_dev *dev = zone->dev;
 	unsigned int noio_flag;
 	int ret;
 
@@ -1620,7 +1603,7 @@ static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
 				    struct dm_zone *zone)
 {
-	struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+	struct dmz_dev *dev = zone->dev;
 	unsigned int wp = 0;
 	int ret;
 
@@ -1657,7 +1640,7 @@ static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 		return 0;
 
 	if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
-		struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+		struct dmz_dev *dev = zone->dev;
 
 		ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
 				       dmz_start_sect(zmd, zone),
@@ -2218,9 +2201,7 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
 		goto again;
 	}
 	if (dmz_is_meta(zone)) {
-		struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
-
-		dmz_dev_warn(dev, "Zone %u has metadata", zone->id);
+		dmz_zmd_warn(zmd, "Zone %u has metadata", zone->id);
 		zone = NULL;
 		goto again;
 	}

drivers/md/dm-zoned-reclaim.c

@@ -58,7 +58,7 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
 				sector_t block)
 {
 	struct dmz_metadata *zmd = zrc->metadata;
-	struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
+	struct dmz_dev *dev = zone->dev;
 	sector_t wp_block = zone->wp_block;
 	unsigned int nr_blocks;
 	int ret;
@@ -116,7 +116,6 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
 			    struct dm_zone *src_zone, struct dm_zone *dst_zone)
 {
 	struct dmz_metadata *zmd = zrc->metadata;
-	struct dmz_dev *src_dev, *dst_dev;
 	struct dm_io_region src, dst;
 	sector_t block = 0, end_block;
 	sector_t nr_blocks;
@@ -130,17 +129,15 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
 	else
 		end_block = dmz_zone_nr_blocks(zmd);
 	src_zone_block = dmz_start_block(zmd, src_zone);
-	src_dev = dmz_zone_to_dev(zmd, src_zone);
 	dst_zone_block = dmz_start_block(zmd, dst_zone);
-	dst_dev = dmz_zone_to_dev(zmd, dst_zone);
 
 	if (dmz_is_seq(dst_zone))
 		set_bit(DM_KCOPYD_WRITE_SEQ, &flags);
 
 	while (block < end_block) {
-		if (src_dev->flags & DMZ_BDEV_DYING)
+		if (src_zone->dev->flags & DMZ_BDEV_DYING)
 			return -EIO;
-		if (dst_dev->flags & DMZ_BDEV_DYING)
+		if (dst_zone->dev->flags & DMZ_BDEV_DYING)
 			return -EIO;
 
 		if (dmz_reclaim_should_terminate(src_zone))
@@ -163,11 +160,11 @@ static int dmz_reclaim_copy(struct dmz_reclaim *zrc,
 				return ret;
 		}
 
-		src.bdev = src_dev->bdev;
+		src.bdev = src_zone->dev->bdev;
 		src.sector = dmz_blk2sect(src_zone_block + block);
 		src.count = dmz_blk2sect(nr_blocks);
 
-		dst.bdev = dst_dev->bdev;
+		dst.bdev = dst_zone->dev->bdev;
 		dst.sector = dmz_blk2sect(dst_zone_block + block);
 		dst.count = src.count;
 

drivers/md/dm-zoned-target.c

@@ -123,7 +123,7 @@ static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone,
 {
 	struct dmz_bioctx *bioctx =
 		dm_per_bio_data(bio, sizeof(struct dmz_bioctx));
-	struct dmz_dev *dev = dmz_zone_to_dev(dmz->metadata, zone);
+	struct dmz_dev *dev = zone->dev;
 	struct bio *clone;
 
 	if (dev->flags & DMZ_BDEV_DYING)

drivers/md/dm-zoned.h

@@ -80,6 +80,9 @@ struct dm_zone {
 	/* For listing the zone depending on its state */
 	struct list_head	link;
 
+	/* Device containing this zone */
+	struct dmz_dev		*dev;
+
 	/* Zone type and state */
 	unsigned long		flags;
 
@@ -190,7 +193,6 @@ const char *dmz_metadata_label(struct dmz_metadata *zmd);
 sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone);
 sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone);
 unsigned int dmz_nr_chunks(struct dmz_metadata *zmd);
-struct dmz_dev *dmz_zone_to_dev(struct dmz_metadata *zmd, struct dm_zone *zone);
 
 bool dmz_check_dev(struct dmz_metadata *zmd);
 bool dmz_dev_is_dying(struct dmz_metadata *zmd);