Re: Can I create a link to an inode?

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Words by Doug Wyatt [Fri, Aug 15, 2008 at 05:47:55AM -0500]:
>
>
> Russell Miller wrote:
>>
>>
>> On Fri, Aug 15, 2008 at 12:30 AM, Russell Miller <duskglow@xxxxxxxxx  
>> <mailto:duskglow@xxxxxxxxx>> wrote:
>>
>>
>>
>>     On Fri, Aug 15, 2008 at 12:17 AM, Doug Wyatt <dwyatt@xxxxxxxxxxxxx
>>     <mailto:dwyatt@xxxxxxxxxxxxx>> wrote:
>>
>>         Here's the situation - I have video file, currently open
>>         in Mplayer, which I accidentally deleted from its directory.
>>
>>         So, the storage and inode still exist as long as I don't
>>         close the Mplayer.
>>
>>         Does anyone know of a way, using available commands or via
>>         system calls in a program, to reestablish a link from a
>>         directory to the inode?
>>
>>
>>
>>     You might try going into debugfs, finding the inode, and seeing if
>>     you can tell it it's not deleted anymore.  It's not actually deleted
>>     until all the references are closed, so I think it might be possible
>>     (I don't know the internal details of what happens when a file is
>>     deleted but not closed so I may be wrong).
>>
>>
>> Oh hey.  Look what I found.
>>
>> http://dag.wieers.com/blog/undeleting-an-open-file-by-inode
>>
>> Still risky but at least you won't be flying blind.
>>
>> --Russell
>>
>
> Excellent!
>
> Debugfs was exactly what I was looking for.  I already had the
> inode number from lsof.  Going into debugfs and using 'ln' and
> 'set_inode_field' (for incrementing the link count) took care
> of my problem.
>
> I did download the source for 'fdlink', mentioned in a comment
> on <dag.wieers.com>, and looked it over.  But I decided, for
> this situation, debugfs was less likely to cause a problem.
>

There's a much easier way. Well, you don't really relink the inode but
copy the original file instead:

1. locate the open (deleted) file you want from the opening pid on /proc/$PID/fd/*
2. cp /proc/$PID/fd/$FD somewhere

-- 
Jose Celestino | http://japc.uncovering.org/files/japc-pgpkey.asc
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