linux-ext4 - Re: Ext2/3 block remapping tool

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Message-ID: <20070501060142.GZ5967@schatzie.adilger.int>
Date:	Tue, 1 May 2007 00:01:42 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: Ext2/3 block remapping tool

On Apr 30, 2007  08:09 -0400, Theodore Tso wrote:
> On Fri, Apr 27, 2007 at 12:09:42PM -0600, Andreas Dilger wrote:
> > I'd prefer that such functionality be integrated with Takashi's online
> > defrag tool, since it needs virtually the same functionality.  For that
> > matter, this is also very similar to the block-mapped -> extents tool
> > from Aneesh.  It doesn't make sense to have so many separate tools for
> > users, especially if they start interfering with each other (i.e. defrag
> > undoes the remapping done by your tool).
> 
> While we're at it, someone want to start thinking about on-line
> shrinking of ext4 filesystems?  Again, the same block remapping
> interfaces for defrag and file access optimizations should also be
> useful for shrinking filesystems (even if some of the files that need
> to be relocated are being actively used).  If not, that probably means
> we got the interface wrong.

Except one other issue with online shrinking is that we need to move
inodes on occasion and this poses a bunch of other problems over just
remapping the data blocks.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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