On Wed, Feb 24, 2021 at 10:40 PM Chris Murphy <li...@colorremedies.com> wrote: > > I think you best chance is to start out trying to restore from a > recent snapshot. As long as the failed controller wasn't writing > totally spurious data in random locations, that snapshot should be > intact.
i.e. the strategy for this is btrfs restore -r option That only takes subvolid. You can get a subvolid listing with -l option but this doesn't show the subvolume names yet (patch is pending) https://github.com/kdave/btrfs-progs/issues/289 As an alternative to applying that and building yourself, you can approximate it with: sudo btrfs insp dump-t -t 1 /dev/sda6 | grep -A 1 ROOT_REF e.g. item 9 key (FS_TREE ROOT_REF 631) itemoff 14799 itemsize 26 root ref key dirid 256 sequence 54 name varlog34 The subvolume varlog34 is subvolid 631. It's the same for snapshots. So the restore command will use -r 631 to restore only from that subvolume. -- Chris Murphy