18.12.2017 19:49, Ulli Horlacher пишет: > 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' > > >
btrfs-debug-tree -r /dev/sdd4 (or in more recent btrfs-progs, "btrfs inspect-internal dump-tree") will show subvolume IDs (as ROOT_ITEM); I'm not sure of there is simple way to resolve subvolume path names on unmounted device. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
