linux-ext4 - Re: [PATCH 5 2/4] Return 32/64-bit dir name hash according to usage type

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Date:	Tue, 6 Mar 2012 10:15:43 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
Cc:	linux-nfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Fan Yong <yong.fan@...mcloud.com>,
	bfields@...hat.com, sandeen@...hat.com,
	Andreas Dilger <adilger@...mcloud.com>
Subject: Re: [PATCH 5 2/4] Return 32/64-bit dir name hash according to
 usage type

On Tue, Mar 06, 2012 at 10:59:55AM +0100, Bernd Schubert wrote:
> Arg, my bad, I introduced this issue when I converted from f_flags
> to f_mode, seems I forgot all of those above :(
> Hrm, I thought I had tested sufficiently, but obviously I did not :(
> Here's the test tool.
> http://www.pci.uni-heidelberg.de/tc/usr/bernd/downloads/test_seekdir/
> 
> While quickly looking, I think it only affects NFSv2, which I think
> I indeed didn't test. I only run tests for 32 bit and 64-bit user
> space and NFSv3. But yes, NFSv2 is an important test too. Not sure
> if I will find time for that today.

I think the problem case to worry about would have been on a 32-bit
NFS server (think embedded/bookshelf NAS servers) and NFSv3, since
that's where the inconsistency would have meant that hash2pos would
use the 32-bit codepath, but pos2maj_hash would use the 64-bit
codepath, and so then...  kablooey.

> Will send an updated version later on.

If it's just those changes, no worries, as I've already fixed up the
f_flags vs. f_mode issue in my copy of the patches.

Let me know if there are any other changes that you'd like to make or
issues that you've spotted.

						- Ted
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