dm zoned: Introduce dmz_dev_is_dying() and dmz_check_dev()

Introduce accessors dmz_dev_is_dying() and dmz_check_dev() to
avoid having to reference the devices 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

@@ -267,6 +267,16 @@ const char *dmz_metadata_label(struct dmz_metadata *zmd)
 	return (const char *)zmd->devname;
 }
 
+bool dmz_check_dev(struct dmz_metadata *zmd)
+{
+	return dmz_check_bdev(&zmd->dev[0]);
+}
+
+bool dmz_dev_is_dying(struct dmz_metadata *zmd)
+{
+	return dmz_bdev_is_dying(&zmd->dev[0]);
+}
+
 /*
  * Lock/unlock mapping table.
  * The map lock also protects all the zone lists.
@@ -1719,7 +1729,7 @@ struct dm_zone *dmz_get_chunk_mapping(struct dmz_metadata *zmd, unsigned int chu
 		/* Allocate a random zone */
 		dzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND);
 		if (!dzone) {
-			if (dmz_bdev_is_dying(zmd->dev)) {
+			if (dmz_dev_is_dying(zmd)) {
 				dzone = ERR_PTR(-EIO);
 				goto out;
 			}
@@ -1820,7 +1830,7 @@ struct dm_zone *dmz_get_chunk_buffer(struct dmz_metadata *zmd,
 	/* Allocate a random zone */
 	bzone = dmz_alloc_zone(zmd, DMZ_ALLOC_RND);
 	if (!bzone) {
-		if (dmz_bdev_is_dying(zmd->dev)) {
+		if (dmz_dev_is_dying(zmd)) {
 			bzone = ERR_PTR(-EIO);
 			goto out;
 		}

drivers/md/dm-zoned-reclaim.c

@@ -455,7 +455,7 @@ static void dmz_reclaim_work(struct work_struct *work)
 	unsigned int p_unmap_rnd;
 	int ret;
 
-	if (dmz_bdev_is_dying(zrc->dev))
+	if (dmz_dev_is_dying(zmd))
 		return;
 
 	if (!dmz_should_reclaim(zrc)) {
@@ -490,7 +490,7 @@ static void dmz_reclaim_work(struct work_struct *work)
 	if (ret) {
 		DMDEBUG("(%s): Reclaim error %d\n",
 			dmz_metadata_label(zmd), ret);
-		if (!dmz_check_bdev(zrc->dev))
+		if (!dmz_check_dev(zmd))
 			return;
 	}
 

drivers/md/dm-zoned-target.c

@@ -632,7 +632,7 @@ static int dmz_map(struct dm_target *ti, struct bio *bio)
 	sector_t chunk_sector;
 	int ret;
 
-	if (dmz_bdev_is_dying(dmz->dev))
+	if (dmz_dev_is_dying(zmd))
 		return DM_MAPIO_KILL;
 
 	DMDEBUG("(%s): BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks",

drivers/md/dm-zoned.h

@@ -181,6 +181,9 @@ 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);
 
+bool dmz_check_dev(struct dmz_metadata *zmd);
+bool dmz_dev_is_dying(struct dmz_metadata *zmd);
+
 #define DMZ_ALLOC_RND		0x01
 #define DMZ_ALLOC_RECLAIM	0x02