linux-kernel - Re: [PATCH 7/7][TAKE5] ext4: support new modes

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Message-ID: <20070628180750.GB1674@amitarora.in.ibm.com>
Date:	Thu, 28 Jun 2007 23:37:50 +0530
From:	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>
To:	David Chinner <dgc@....com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, suparna@...ibm.com, cmm@...ibm.com,
	xfs@....sgi.com
Subject: Re: [PATCH 7/7][TAKE5] ext4: support new modes

On Wed, Jun 27, 2007 at 10:04:56AM +1000, David Chinner wrote:
> On Wed, Jun 27, 2007 at 12:59:08AM +0530, Amit K. Arora wrote:
> > On Tue, Jun 26, 2007 at 12:14:00PM -0400, Andreas Dilger wrote:
> > > On Jun 26, 2007  17:37 +0530, Amit K. Arora wrote:
> > > > I think, modifying ctime/mtime should be dependent on the other flags.
> > > > E.g., if we do not zero out data blocks on allocation/deallocation,
> > > > update only ctime. Otherwise, update ctime and mtime both.
> > > 
> > > I'm only being the advocate for requirements David Chinner has put
> > > forward due to existing behaviour in XFS.  This is one of the reasons
> > > why I think the "flags" mechanism we now have - we can encode the
> > > various different behaviours in any way we want and leave it to the
> > > caller.
> > 
> > I understand. May be we can confirm once more with David Chinner if this
> > is really required. Will it really be a compatibility issue if new XFS
> > preallocations (ie. via fallocate) update mtime/ctime?
> 
> It should be left up to the filesystem to decide. Only the
> filesystem knows whether something changed and the timestamp should
> or should not be updated.

Since Andreas had suggested FA_FL_NO_MTIME flag thinking it as a
requirement from XFS (whereas XFS does not need this flag), I don't think
we need to add this new flag.

Please let know if someone still feels FA_FL_NO_MTIME flag can be
useful.

--
Regards,
Amit Arora

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