Re: Userspace cp and ls utility

[Jan Dittmer <jdi@l4x.org>]

Eric Sandeen schrieb:
> Jan Dittmer wrote:
> 
>> Are there utilities for xfs which are able to ls and
>> cp from an _unmounted_ xfs volume? I fear that by
>> mounting the volume - even ro - I would lose even more
>> data.
>> Or can I achieve such an effect with other xfs related
>> utilities?
> 
> 
> Mounting ro should be fine - if you also mount with "norecovery" then 
> truly no IO should happen.  If you're really paranoid, find a utility to 
> mark the block device itself as read-only, then you've taken it out of 
> the filesystem's hands completely.

Thanks for the suggestions. Meanwhile I found the norecovery option
myself and got most of my data back. Strangely enough I had one top
directory missing on one mount attempt (only ro option) and it appeared
again on the next attempt (ro + norecovery).

> You could also try xfs_copy, it makes a copy of the filesystem and works 
> on the underlying device, with the filesystem unmounted.  There's a man 
> page for it.

Is there any difference to using dd when the destination is no xfs
filesystem? And if I read the description correctly it does not allow
to copy individual files?

Thanks,

Jan