btrfs: zoned: factor out DUP bg handling from btrfs_load_block_group_zone_info

Split the code handling a type DUP block group from
btrfs_load_block_group_zone_info to make the code more readable.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/zoned.c

@@ -1392,6 +1392,47 @@ static int btrfs_load_block_group_single(struct btrfs_block_group *bg,
 	return 0;
 }
 
+static int btrfs_load_block_group_dup(struct btrfs_block_group *bg,
+				      struct map_lookup *map,
+				      struct zone_info *zone_info,
+				      unsigned long *active)
+{
+	if (map->type & BTRFS_BLOCK_GROUP_DATA) {
+		btrfs_err(bg->fs_info,
+			  "zoned: profile DUP not yet supported on data bg");
+		return -EINVAL;
+	}
+
+	if (zone_info[0].alloc_offset == WP_MISSING_DEV) {
+		btrfs_err(bg->fs_info,
+			  "zoned: cannot recover write pointer for zone %llu",
+			  zone_info[0].physical);
+		return -EIO;
+	}
+	if (zone_info[1].alloc_offset == WP_MISSING_DEV) {
+		btrfs_err(bg->fs_info,
+			  "zoned: cannot recover write pointer for zone %llu",
+			  zone_info[1].physical);
+		return -EIO;
+	}
+	if (zone_info[0].alloc_offset != zone_info[1].alloc_offset) {
+		btrfs_err(bg->fs_info,
+			  "zoned: write pointer offset mismatch of zones in DUP profile");
+		return -EIO;
+	}
+
+	if (test_bit(0, active) != test_bit(1, active)) {
+		if (!btrfs_zone_activate(bg))
+			return -EIO;
+	} else if (test_bit(0, active)) {
+		set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
+	}
+
+	bg->alloc_offset = zone_info[0].alloc_offset;
+	bg->zone_capacity = min(zone_info[0].capacity, zone_info[1].capacity);
+	return 0;
+}
+
 int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
 {
 	struct btrfs_fs_info *fs_info = cache->fs_info;
@@ -1481,43 +1522,7 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
 		ret = btrfs_load_block_group_single(cache, &zone_info[0], active);
 		break;
 	case BTRFS_BLOCK_GROUP_DUP:
-		if (map->type & BTRFS_BLOCK_GROUP_DATA) {
-			btrfs_err(fs_info, "zoned: profile DUP not yet supported on data bg");
-			ret = -EINVAL;
-			goto out;
-		}
-		if (zone_info[0].alloc_offset == WP_MISSING_DEV) {
-			btrfs_err(fs_info,
-			"zoned: cannot recover write pointer for zone %llu",
-				zone_info[0].physical);
-			ret = -EIO;
-			goto out;
-		}
-		if (zone_info[1].alloc_offset == WP_MISSING_DEV) {
-			btrfs_err(fs_info,
-			"zoned: cannot recover write pointer for zone %llu",
-				zone_info[1].physical);
-			ret = -EIO;
-			goto out;
-		}
-		if (zone_info[0].alloc_offset != zone_info[1].alloc_offset) {
-			btrfs_err(fs_info,
-			"zoned: write pointer offset mismatch of zones in DUP profile");
-			ret = -EIO;
-			goto out;
-		}
-		if (test_bit(0, active) != test_bit(1, active)) {
-			if (!btrfs_zone_activate(cache)) {
-				ret = -EIO;
-				goto out;
-			}
-		} else {
-			if (test_bit(0, active))
-				set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
-					&cache->runtime_flags);
-		}
-		cache->alloc_offset = zone_info[0].alloc_offset;
-		cache->zone_capacity = min(zone_info[0].capacity, zone_info[1].capacity);
+		ret = btrfs_load_block_group_dup(cache, map, zone_info, active);
 		break;
 	case BTRFS_BLOCK_GROUP_RAID1:
 	case BTRFS_BLOCK_GROUP_RAID0: