btrfs: factor out block mapping for DUP profiles

Now that we have a container for the I/O geometry that has all the needed
information for the block mappings of DUP, factor out a helper calculating
this information.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: morbidrsa

fs/btrfs/volumes.c

@@ -6391,6 +6391,22 @@ static void map_blocks_raid1(struct btrfs_fs_info *fs_info,
 	io_geom->mirror_num = io_geom->stripe_index + 1;
 }
 
+static void map_blocks_dup(const struct btrfs_chunk_map *map,
+			   struct btrfs_io_geometry *io_geom)
+{
+	if (io_geom->op != BTRFS_MAP_READ) {
+		io_geom->num_stripes = map->num_stripes;
+		return;
+	}
+
+	if (io_geom->mirror_num) {
+		io_geom->stripe_index = io_geom->mirror_num - 1;
+		return;
+	}
+
+	io_geom->mirror_num = 1;
+}
+
 /*
  * Map one logical range to one or more physical ranges.
  *
@@ -6482,14 +6498,7 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
 	} else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) {
 		map_blocks_raid1(fs_info, map, &io_geom, dev_replace_is_ongoing);
 	} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
-		if (op != BTRFS_MAP_READ) {
-			io_geom.num_stripes = map->num_stripes;
-		} else if (io_geom.mirror_num) {
-			io_geom.stripe_index = io_geom.mirror_num - 1;
-		} else {
-			io_geom.mirror_num = 1;
-		}
-
+		map_blocks_dup(map, &io_geom);
 	} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
 		u32 factor = map->num_stripes / map->sub_stripes;