btrfs-progs: mkfs: print type of subvolume in the listing

Print indicators in the summary if the subvolume is read-write,
read-only or default:

$ mkfs.btrfs --subvol ro:subvolro --subvol rw:subvolrw --subvol default-ro:defaultro --rootdir /rootdir/path img
...
Rootdir from:       /rootdir/path
  Compress:         no
  Subvolume (rw):   subvolrw
  Subvolume (ro):   subvolro
  Subvolume (dro):  defaultro
...

The path is relative to the rootdir path and may not be a subvolume in
the source directory so drop the rootdir as this may be confusing.

Signed-off-by: David Sterba <[email protected]>

Author: kdave

mkfs/main.c

@@ -2078,8 +2078,11 @@ int BOX_MAIN(mkfs)(int argc, char **argv)
 
 		/* Print subvolumes now as btrfs_mkfs_fill_dir() deletes the list. */
 		list_for_each_entry(rds, &subvols, list) {
-			pr_verbose(LOG_DEFAULT, "  Subvolume:        %s\n",
-				   rds->full_path);
+			pr_verbose(LOG_DEFAULT, "  Subvolume (%s%s):  %s%s\n",
+				   rds->is_default ? "d" : "",
+				   rds->readonly ? "ro" : "rw",
+				   rds->is_default ? "" : " ",
+				   rds->dir);
 		}
 
 		ret = btrfs_mkfs_fill_dir(trans, source_dir, root,