linux-kernel - Re: [RFC][PATCH 13/14] ext3 whiteout support

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Message-ID: <20070515142830.GA5656@thunk.org>
Date:	Tue, 15 May 2007 10:28:31 -0400
From:	Theodore Tso <tytso@....edu>
To:	Jan Blunck <jblunck@...e.de>
Cc:	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Jan Blunck <j.blunck@...harburg.de>
Subject: Re: [RFC][PATCH 13/14] ext3 whiteout support

On Mon, May 14, 2007 at 10:35:47PM +0200, Jan Blunck wrote:
> 
> I don't know. I tried to contact him a few weeks ago but failed.
> Guess, maybe he isn't reading the @thunk.org email anymore which was
> reference in the e2fsprogs source I used.

I do pay more attention to mail sent to the @mit.edu address, but I
don't recall any reservation requests sent to my @thunk.org address
(nope, don't see it; maybe it got caught in my spam filters?  When did
you send it, precisely?)

> Ted,
> from ext2_fs.h I learn that the value 0x0020 is left unused.
> 
> #define EXT2_FEATURE_INCOMPAT_META_BG           0x0010
> #define EXT3_FEATURE_INCOMPAT_EXTENTS           0x0040
> #define EXT4_FEATURE_INCOMPAT_64BIT             0x0080
> 
> Is this intentionally?

I think 0x0020 was used at one point, but I can't remember what it was
used for.  It's almost certainly not in wide use at this point, so
it's probably safe to use it; OTOH it's not like we're running out of
bits at this point.

						- Ted

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