Lost+found

Lost+found

[Jeffrey Sandel]

Recently I ran xfs_repair due to a firmware upgrade on an unmounted
disk. The repair recovered the data but moved it to the lost+found
directory.

How do I recover file names and ownership?

Thanks!

Jeffrey Sandel

Re: Lost+found

[Barry Naujok]

On Tue, 08 Apr 2008 15:20:33 +1000, Jeffrey Sandel  
<webmaster@javainbaja.com> wrote:

> Recently I ran xfs_repair due to a firmware upgrade on an unmounted
> disk. The repair recovered the data but moved it to the lost+found
> directory.
>
> How do I recover file names and ownership?

The only real options you have AFAIK is the file command to try and  
identify
what type of file it is and just manually inspecting the files.

Then, you might be able to derive its filename and where it came from.

Regards,
Barry.

Re: Lost+found

[Justin Piszcz]

On Wed, 9 Apr 2008, Barry Naujok wrote:

> On Tue, 08 Apr 2008 15:20:33 +1000, Jeffrey Sandel <webmaster@javainbaja.com> 
> wrote:
>
>> Recently I ran xfs_repair due to a firmware upgrade on an unmounted
>> disk. The repair recovered the data but moved it to the lost+found
>> directory.
>> 
>> How do I recover file names and ownership?
>
> The only real options you have AFAIK is the file command to try and identify
> what type of file it is and just manually inspecting the files.
>
> Then, you might be able to derive its filename and where it came from.
>
> Regards,
> Barry.
>

Is there any chance this process could ever be improved so that the files 
are restored back to their original locations or there is something that 
keeps track of where they were located?

Justin.

Re: Lost+found

[Eric Sandeen]

Justin Piszcz wrote:
> 
> On Wed, 9 Apr 2008, Barry Naujok wrote:
> 
>> On Tue, 08 Apr 2008 15:20:33 +1000, Jeffrey Sandel <webmaster@javainbaja.com> 
>> wrote:
>>
>>> Recently I ran xfs_repair due to a firmware upgrade on an unmounted
>>> disk. The repair recovered the data but moved it to the lost+found
>>> directory.
>>>
>>> How do I recover file names and ownership?
>> The only real options you have AFAIK is the file command to try and identify
>> what type of file it is and just manually inspecting the files.
>>
>> Then, you might be able to derive its filename and where it came from.
>>
>> Regards,
>> Barry.
>>
> 
> Is there any chance this process could ever be improved so that the files 
> are restored back to their original locations or there is something that 
> keeps track of where they were located?

The whole reason they're in lost+found is because they are "orphaned" -
allocated & in use but not referenced by any directory... so the best
xfs_repair can do is rename to lost+found with the inode number.

Crosses my mind that one could probably write a generic tool which could
work with a package manager db to check file md5sums in /lost+found, if
the files happen to be system files installed via a package.... but if
they're files from your homedir or whatnot, it's tougher.

-Eric

Re: Lost+found

[Christoph Hellwig]

On Wed, Apr 09, 2008 at 08:11:13AM -0500, Eric Sandeen wrote:
> The whole reason they're in lost+found is because they are "orphaned" -
> allocated & in use but not referenced by any directory... so the best
> xfs_repair can do is rename to lost+found with the inode number.

At least until we get parent pointers.  Niv, any updates?

Re: Lost+found

[Niv Sardi]

Christoph Hellwig <hch@infradead.org> writes:
> On Wed, Apr 09, 2008 at 08:11:13AM -0500, Eric Sandeen wrote:
>> The whole reason they're in lost+found is because they are "orphaned" -
>> allocated & in use but not referenced by any directory... so the best
>> xfs_repair can do is rename to lost+found with the inode number.
>
> At least until we get parent pointers.  Niv, any updates?

I was lost in DMAPI land for a while, I'll resume work on PP next week,
patches up for review soonish after I fix some issues.

Cheers,
-- 
Niv Sardi

Re: Lost+found

[Emmanuel Florac]

Le Wed, 09 Apr 2008 08:11:13 -0500
Eric Sandeen <sandeen@sandeen.net> écrivait:

> Crosses my mind that one could probably write a generic tool which
> could work with a package manager db to check file md5sums
> in /lost+found, if the files happen to be system files installed via
> a package....

Yup, I've done something similar when I used a PC with a bugged via
chipset which regularly broke apart filesystems under heavy load... I
used a tool named afick to index the whole disks (it stores md5 of
everything in a small db) and with some tinkering I was able to restore
everything from lost+found each time some filesystem went belly up
(once a month...)

-- 
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Emmanuel Florac     |   Intellique
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