I want to mount an alternative subvolume of a btrfs filesystem. I can list the subvolumes when the filesystem is mounted, but how do I know them, when the filesystem is not mounted? Is there a query command? root@xerus:~# mount | grep /test /dev/sdd4 on /test type btrfs (rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=5,subvol=/) root@xerus:~# btrfs subvolume list /test ID 258 gen 156 top level 5 path tux/zz ID 259 gen 156 top level 5 path tux/z1 ID 260 gen 156 top level 5 path tmp/zz ID 261 gen 19 top level 260 path tmp/zz/z1 ID 269 gen 156 top level 5 path tux/test ID 271 gen 129 top level 269 path tux/test/.snapshot/2017-12-02_1341.test root@xerus:~# umount /test root@xerus:~# btrfs subvolume list /dev/sdd4 ERROR: not a btrfs filesystem: /dev/sdd4 ERROR: can't access '/dev/sdd4' -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher@xxxxxxxxxxxxxxxxxxxx Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<20171218164941.GA22020@xxxxxxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
