Migrating from a filesystem within LUKS fails to find the block device

koverstreet / bcachefs-tools

http://bcachefs.org

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Migrating from a filesystem within LUKS fails to find the block device #167

Open Eyenseo opened 1 year ago

Eyenseo commented 1 year ago

When trying to migrate a filesystem that is not residing directly in a block device the bcachefs migrate tool comes back with readlink error while looking up block device: No such file or directory.

The following mount combinations were tried and didn't work:

LUKS (by-uuid) then btrfs (mapper)
LUKS (path/sd*) then btrfs (mapper)
LUKS (path/sd*) then btrfs (path/dm-*)

Side question since this problem appeared; Is there any downside to have bcachefs within LUKS?

wangling12 commented 1 year ago

When I tried to migrate from btrfs, the same error occurred. This seems to be because btrfs return a "fake" device id, such as https://unix.stackexchange.com/questions/345220/btrfs-how-to-get-real-device-id . And these device ids not exist in /sys/dev/block: https://github.com/koverstreet/bcachefs-tools/blob/61134a06fa714f32a405680d3515af94dfa11d2c/cmd_migrate.c#L50-L56

So it seems that the migrate command does not support btrfs now.