On Wed, May 14, 2014 at 08:43:41PM +0200, laie wrote:
> On 2014-05-11 16:19, Hugo Mills wrote:
> >On Tue, May 13, 2014 at 10:16:59AM +0200, laie wrote:
> >>On 2014-05-09 20:01, Hugo Mills wrote:
> >>>On Fri, May 09, 2014 at 06:58:27PM +0100, Hugo Mills wrote:
> >>>>On Fri, May 09, 2014 at 08:02:45PM +0200, laie wrote:
> >>>>> Now I'm looking for a way to tell btrfs to provide me with a list of the
> >>>>> corrupted files and delete them afterwards. This would be great, because
> >>>>> otherwise it would take very long to get the data back from slow backups.
> >>>>
> >>>>   Simple solution: cat every file to /dev/null, and see which ones
> >>>>fail with an I/O error. With RAID-0 data, losing a device is going to
> >>>>damage most files, though, so don't necessarily expect much to survive.
> 
> I finished building the List, about 40% of the Data is gone. So far so good.
> 
> As next step I planned to delete these files. This is not possible because
> I'm not able to mount the fs r/w.
> 
> btrfs: allowing degraded mounts
> btrfs: bdev /dev/mapper/luks-0 errs: wr 37519, rd 32783, flush 0, corrupt 0,
> gen 0
> Btrfs: too many missing devices, writeable mount is not allowed
> btrfs: open_ctree failed
> 
> Is it correct remove the missing device now:
> 
> btrfs device delete missing /mnt
> 
> Or do I have to add the replacement first?

   You'd have to mount r/w before you can add a new disk. :)

   You should be able to mount r/w using the -o degraded mount option.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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  --- Attempted murder, now honestly, what is that?  Do they give a ---  
                  Nobel Prize for attempted chemistry?