[systemd-devel] udev and btrfs multiple devices

[Chris Murphy]

Is it possible for a udev rule to have a timeout? For example:
/usr/lib/udev/rules.d/64-btrfs.rules

This udev rule will wait indefinitely for a missing device to appear.
It'd be better if it gives up at some point and drops to a dracut
shell. Is that possible? The only alternative right now is the user
has to force power off, and boot with something like
rd.break=pre-mount, although I'm not 100% certain that'll break soon
enough to avoid the hang.

Next, is it possible to enhance udev so that it can report the number
of devices expected for a Btrfs file system? This information is
currently in the Btrfs superblock found on each device in the
num_devices field.
https://github.com/storaged-project/udisks/pull/838#issuecomment-768372627


Thanks,

-- 
Chris Murphy