linux-kernel - Re: Btrfs Snapshot Removal And General Project Status

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Date:	Fri, 16 Jan 2009 10:16:51 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Tarkan Erimer <tarkan.erimer@...knet.net.tr>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Btrfs Snapshot Removal And General Project Status

On Wed, 2009-01-14 at 12:43 +0200, Tarkan Erimer wrote:
> Hi Chris,
> 

Sorry for the delay, I missed this one somehow.

> For the last few days, I was playing with btrfs. It looks really very 
> promising and fantastic! :-)

Glad to hear it worked.

> Thanks for everybody who involved with this amazing file system project! 
> ;-) Now, I play with snapshots. Creating snapshot is a breeze. 
> Recovering from snapshots work very well without any problems as far as 
> I tried. But; when I tried to remove the snapshot directories, I got an 
> error message that says : "cannot remove directory `snap1': Directory 
> not empty". But actually, it is empty. After that, I googled a bit and 
> found at "http://btrfs.wiki.kernel.org/index.php/Project_ideas" at 
> "Removal Snapshots" section, it states that it needs to be implement. 
> But, it's unclear which state this feature is now.
> 

That's right.  You did rm -rf dir, which is actually the slowest
possible way to remove the snapshot ;)  A much more optimized version is
possible, and already implemented as part of transaction commit.

But, the fast version is basically the same as unlinking a directory
that may or may not be in use.  We need to implement code to do that
properly wrt the VFS.

> It could be perfect to prepare a document that shows the current status 
> (completed, blah-blah % completed etc.) of the features,general status 
> of the project and maybe deadlines of feature implementions. Like : 
> "next release will have blah-blah features" etc.
> 

A very good point, I'm in the process of documenting this better.

> 
> BTW, is there any temporary way to remove these snapshot directories 
> before this "Remove Snapshot" feature implemented ? ;-)
> 

Unfortunately not, sorry.

-chris


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