dm zoned: store zone id within the zone structure and kill dmz_id()

Instead of calculating the zone index by the offset within the
zone array store the index within the structure itself. With that
the helper dmz_id() is pointless and can be replaced with accessing
the ->id value directly.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-zoned-metadata.c

@@ -187,19 +187,14 @@ struct dmz_metadata {
 /*
  * Various accessors
  */
-unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone)
-{
-	return ((unsigned int)(zone - zmd->zones));
-}
-
 sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
 {
-	return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_sectors_shift;
+	return (sector_t)zone->id << zmd->dev->zone_nr_sectors_shift;
 }
 
 sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
 {
-	return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift;
+	return (sector_t)zone->id << zmd->dev->zone_nr_blocks_shift;
 }
 
 unsigned int dmz_nr_zones(struct dmz_metadata *zmd)
@@ -1119,6 +1114,7 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int idx, void *data)
 
 	INIT_LIST_HEAD(&zone->link);
 	atomic_set(&zone->refcount, 0);
+	zone->id = idx;
 	zone->chunk = DMZ_MAP_UNMAPPED;
 
 	switch (blkz->type) {
@@ -1246,7 +1242,7 @@ static int dmz_update_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 		ret = -EIO;
 	if (ret < 0) {
 		dmz_dev_err(zmd->dev, "Get zone %u report failed",
-			    dmz_id(zmd, zone));
+			    zone->id);
 		dmz_check_bdev(zmd->dev);
 		return ret;
 	}
@@ -1270,7 +1266,7 @@ static int dmz_handle_seq_write_err(struct dmz_metadata *zmd,
 		return ret;
 
 	dmz_dev_warn(zmd->dev, "Processing zone %u write error (zone wp %u/%u)",
-		     dmz_id(zmd, zone), zone->wp_block, wp);
+		     zone->id, zone->wp_block, wp);
 
 	if (zone->wp_block < wp) {
 		dmz_invalidate_blocks(zmd, zone, zone->wp_block,
@@ -1309,7 +1305,7 @@ static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 				       dev->zone_nr_sectors, GFP_NOIO);
 		if (ret) {
 			dmz_dev_err(dev, "Reset zone %u failed %d",
-				    dmz_id(zmd, zone), ret);
+				    zone->id, ret);
 			return ret;
 		}
 	}
@@ -1757,8 +1753,7 @@ struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
 	}
 
 	/* Update the chunk mapping */
-	dmz_set_chunk_mapping(zmd, dzone->chunk, dmz_id(zmd, dzone),
-			      dmz_id(zmd, bzone));
+	dmz_set_chunk_mapping(zmd, dzone->chunk, dzone->id, bzone->id);
 
 	set_bit(DMZ_BUF, &bzone->flags);
 	bzone->chunk = dzone->chunk;
@@ -1810,7 +1805,7 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
 		atomic_dec(&zmd->unmap_nr_seq);
 
 	if (dmz_is_offline(zone)) {
-		dmz_dev_warn(zmd->dev, "Zone %u is offline", dmz_id(zmd, zone));
+		dmz_dev_warn(zmd->dev, "Zone %u is offline", zone->id);
 		zone = NULL;
 		goto again;
 	}
@@ -1852,7 +1847,7 @@ void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *dzone,
 		  unsigned int chunk)
 {
 	/* Set the chunk mapping */
-	dmz_set_chunk_mapping(zmd, chunk, dmz_id(zmd, dzone),
+	dmz_set_chunk_mapping(zmd, chunk, dzone->id,
 			      DMZ_MAP_UNMAPPED);
 	dzone->chunk = chunk;
 	if (dmz_is_rnd(dzone))
@@ -1880,7 +1875,7 @@ void dmz_unmap_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
 		 * Unmapping the chunk buffer zone: clear only
 		 * the chunk buffer mapping
 		 */
-		dzone_id = dmz_id(zmd, zone->bzone);
+		dzone_id = zone->bzone->id;
 		zone->bzone->bzone = NULL;
 		zone->bzone = NULL;
 
@@ -1942,7 +1937,7 @@ static struct dmz_mblock *dmz_get_bitmap(struct dmz_metadata *zmd,
 					 sector_t chunk_block)
 {
 	sector_t bitmap_block = 1 + zmd->nr_map_blocks +
-		(sector_t)(dmz_id(zmd, zone) * zmd->zone_nr_bitmap_blocks) +
+		(sector_t)(zone->id * zmd->zone_nr_bitmap_blocks) +
 		(chunk_block >> DMZ_BLOCK_SHIFT_BITS);
 
 	return dmz_get_mblock(zmd, bitmap_block);
@@ -2022,7 +2017,7 @@ int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
 	unsigned int n = 0;
 
 	dmz_dev_debug(zmd->dev, "=> VALIDATE zone %u, block %llu, %u blocks",
-		      dmz_id(zmd, zone), (unsigned long long)chunk_block,
+		      zone->id, (unsigned long long)chunk_block,
 		      nr_blocks);
 
 	WARN_ON(chunk_block + nr_blocks > zone_nr_blocks);
@@ -2052,7 +2047,7 @@ int dmz_validate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
 		zone->weight += n;
 	else {
 		dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be <= %u",
-			     dmz_id(zmd, zone), zone->weight,
+			     zone->id, zone->weight,
 			     zone_nr_blocks - n);
 		zone->weight = zone_nr_blocks;
 	}
@@ -2102,7 +2097,7 @@ int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
 	unsigned int n = 0;
 
 	dmz_dev_debug(zmd->dev, "=> INVALIDATE zone %u, block %llu, %u blocks",
-		      dmz_id(zmd, zone), (u64)chunk_block, nr_blocks);
+		      zone->id, (u64)chunk_block, nr_blocks);
 
 	WARN_ON(chunk_block + nr_blocks > zmd->dev->zone_nr_blocks);
 
@@ -2132,7 +2127,7 @@ int dmz_invalidate_blocks(struct dmz_metadata *zmd, struct dm_zone *zone,
 		zone->weight -= n;
 	else {
 		dmz_dev_warn(zmd->dev, "Zone %u: weight %u should be >= %u",
-			     dmz_id(zmd, zone), zone->weight, n);
+			     zone->id, zone->weight, n);
 		zone->weight = 0;
 	}
 
@@ -2378,7 +2373,7 @@ static void dmz_cleanup_metadata(struct dmz_metadata *zmd)
 int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata)
 {
 	struct dmz_metadata *zmd;
-	unsigned int i, zid;
+	unsigned int i;
 	struct dm_zone *zone;
 	int ret;
 
@@ -2419,9 +2414,8 @@ int dmz_ctr_metadata(struct dmz_dev *dev, struct dmz_metadata **metadata)
 		goto err;
 
 	/* Set metadata zones starting from sb_zone */
-	zid = dmz_id(zmd, zmd->sb_zone);
 	for (i = 0; i < zmd->nr_meta_zones << 1; i++) {
-		zone = dmz_get(zmd, zid + i);
+		zone = dmz_get(zmd, zmd->sb_zone->id + i);
 		if (!dmz_is_rnd(zone))
 			goto err;
 		set_bit(DMZ_META, &zone->flags);

drivers/md/dm-zoned-reclaim.c

@@ -80,7 +80,7 @@ static int dmz_reclaim_align_wp(struct dmz_reclaim *zrc, struct dm_zone *zone,
 	if (ret) {
 		dmz_dev_err(zrc->dev,
 			    "Align zone %u wp %llu to %llu (wp+%u) blocks failed %d",
-			    dmz_id(zmd, zone), (unsigned long long)wp_block,
+			    zone->id, (unsigned long long)wp_block,
 			    (unsigned long long)block, nr_blocks, ret);
 		dmz_check_bdev(zrc->dev);
 		return ret;
@@ -196,8 +196,8 @@ static int dmz_reclaim_buf(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 
 	dmz_dev_debug(zrc->dev,
 		      "Chunk %u, move buf zone %u (weight %u) to data zone %u (weight %u)",
-		      dzone->chunk, dmz_id(zmd, bzone), dmz_weight(bzone),
-		      dmz_id(zmd, dzone), dmz_weight(dzone));
+		      dzone->chunk, bzone->id, dmz_weight(bzone),
+		      dzone->id, dmz_weight(dzone));
 
 	/* Flush data zone into the buffer zone */
 	ret = dmz_reclaim_copy(zrc, bzone, dzone);
@@ -235,8 +235,8 @@ static int dmz_reclaim_seq_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 
 	dmz_dev_debug(zrc->dev,
 		      "Chunk %u, move data zone %u (weight %u) to buf zone %u (weight %u)",
-		      chunk, dmz_id(zmd, dzone), dmz_weight(dzone),
-		      dmz_id(zmd, bzone), dmz_weight(bzone));
+		      chunk, dzone->id, dmz_weight(dzone),
+		      bzone->id, dmz_weight(bzone));
 
 	/* Flush data zone into the buffer zone */
 	ret = dmz_reclaim_copy(zrc, dzone, bzone);
@@ -287,8 +287,7 @@ static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
 
 	dmz_dev_debug(zrc->dev,
 		      "Chunk %u, move rnd zone %u (weight %u) to seq zone %u",
-		      chunk, dmz_id(zmd, dzone), dmz_weight(dzone),
-		      dmz_id(zmd, szone));
+		      chunk, dzone->id, dmz_weight(dzone), szone->id);
 
 	/* Flush the random data zone into the sequential zone */
 	ret = dmz_reclaim_copy(zrc, dzone, szone);
@@ -403,12 +402,12 @@ static int dmz_do_reclaim(struct dmz_reclaim *zrc)
 	if (ret) {
 		dmz_dev_debug(zrc->dev,
 			      "Metadata flush for zone %u failed, err %d\n",
-			      dmz_id(zmd, rzone), ret);
+			      rzone->id, ret);
 		return ret;
 	}
 
 	dmz_dev_debug(zrc->dev, "Reclaimed zone %u in %u ms",
-		      dmz_id(zmd, rzone), jiffies_to_msecs(jiffies - start));
+		      rzone->id, jiffies_to_msecs(jiffies - start));
 	return 0;
 }
 

drivers/md/dm-zoned-target.c

@@ -180,7 +180,7 @@ static int dmz_handle_read(struct dmz_target *dmz, struct dm_zone *zone,
 	dmz_dev_debug(dmz->dev, "READ chunk %llu -> %s zone %u, block %llu, %u blocks",
 		      (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
 		      (dmz_is_rnd(zone) ? "RND" : "SEQ"),
-		      dmz_id(dmz->metadata, zone),
+		      zone->id,
 		      (unsigned long long)chunk_block, nr_blocks);
 
 	/* Check block validity to determine the read location */
@@ -317,7 +317,7 @@ static int dmz_handle_write(struct dmz_target *dmz, struct dm_zone *zone,
 	dmz_dev_debug(dmz->dev, "WRITE chunk %llu -> %s zone %u, block %llu, %u blocks",
 		      (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
 		      (dmz_is_rnd(zone) ? "RND" : "SEQ"),
-		      dmz_id(dmz->metadata, zone),
+		      zone->id,
 		      (unsigned long long)chunk_block, nr_blocks);
 
 	if (dmz_is_rnd(zone) || chunk_block == zone->wp_block) {
@@ -357,7 +357,7 @@ static int dmz_handle_discard(struct dmz_target *dmz, struct dm_zone *zone,
 
 	dmz_dev_debug(dmz->dev, "DISCARD chunk %llu -> zone %u, block %llu, %u blocks",
 		      (unsigned long long)dmz_bio_chunk(dmz->dev, bio),
-		      dmz_id(zmd, zone),
+		      zone->id,
 		      (unsigned long long)chunk_block, nr_blocks);
 
 	/*

drivers/md/dm-zoned.h

@@ -87,6 +87,9 @@ struct dm_zone {
 	/* Zone activation reference count */
 	atomic_t		refcount;
 
+	/* Zone id */
+	unsigned int		id;
+
 	/* Zone write pointer block (relative to the zone start block) */
 	unsigned int		wp_block;
 
@@ -176,7 +179,6 @@ void dmz_lock_flush(struct dmz_metadata *zmd);
 void dmz_unlock_flush(struct dmz_metadata *zmd);
 int dmz_flush_metadata(struct dmz_metadata *zmd);
 
-unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone);
 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);