linux-ext4 - Re: [EXT4 set 4][PATCH 1/5] i_version:64 bit inode version

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Message-ID: <18068.25879.745638.343290@notabene.brown>
Date:	Wed, 11 Jul 2007 15:05:27 +1000
From:	Neil Brown <neilb@...e.de>
To:	cmm@...ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, nfsv4@...ux-nfs.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [EXT4 set 4][PATCH 1/5] i_version:64 bit inode version

It just occurred to me:

 If i_version is 64bit, then knfsd would need to be careful when
 reading it on a 32bit host.  What are the locking rules?

 Presumably it is only updated under i_mutex protection, but having to
 get i_mutex to read it would seem a little heavy handed.

 Should it use a seqlock like i_size?
 Could we use the same seqlock that i_size uses, or would we need a
 separate one?

NeilBrown
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