linux-ext4 - Re: [PATCH bigalloc] e2fsprogs: change root-inode to extent-mapped

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Message-ID: <20110720174937.GA17971@thunk.org>
Date:	Wed, 20 Jul 2011 13:49:37 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Andreas Dilger <aedilger@...il.com>
Cc:	"hao.bigrat@...il.com" <hao.bigrat@...il.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Robin Dong <sanbai@...bao.com>
Subject: Re: [PATCH bigalloc] e2fsprogs: change root-inode to extent-mapped

On Wed, Jul 20, 2011 at 09:52:49AM -0600, Andreas Dilger wrote:
> 
> That reminds me of a question I had with bigalloc - are htree
> directories supported with bigalloc?  For a 1MB bigalloc chunksize
> it would mean a fanout of 256k, or a maximum directory size of 256GB
> with only a single level.

Yes, htree directories are supported with bigalloc; but it still works
on *blocks*, whereas *clusters* are just used for allocation purposes.

> 
> Any thoughts about increasing the directory size beyond 2GB?
> 

I think the best way to do that is to support more than two levels of
directories.  I seem to recall your telling me that one of your team
had prototyped something like this a while back?  Or is my memory
playing tricks on me?

							- Ted
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