linux-kernel - Re: [rfc][patch 3/4] fs: new truncate sequence

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Message-ID: <20090713090056.GA3452@wotan.suse.de>
Date:	Mon, 13 Jul 2009 11:00:56 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, Jan Kara <jack@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [rfc][patch 3/4] fs: new truncate sequence

On Mon, Jul 13, 2009 at 11:54:15AM +0300, Boaz Harrosh wrote:
> On 07/13/2009 09:59 AM, Nick Piggin wrote:
> > On Sun, Jul 12, 2009 at 10:47:18AM -0400, Christoph Hellwig wrote:
> >> On Sun, Jul 12, 2009 at 11:55:51AM +0300, Boaz Harrosh wrote:
> >>> I wish you would split it.
> >>>
> >>> one - helper to be called by converted file systems
> >>>       (Which just ignores the ATTR_SIZE)
> >>> second - to be set into .setattr which does the simple_setsize + above.
> >>>
> >>> More clear for FS users like me (and that ugly unmask of ATTR_SIZE)
> >>>
> >>> or it's just me?
> >> Yeah, that seems be a lot cleaner.  But let's wait until we got
> >> rid of ->truncate for all filesystems to have the bigger picture.
> > 
> > Agreed, if it is a common sequence / requirement for filesystems
> > then of course I will not object to a helper to make things clearer
> > or share code.
> > 
> > I would like to see inode_setattr renamed into simple_setattr, and
> > then also .setattr made mandatory, so I don't like to cut code out
> > of inode_setattr which makes it unable to be the simple_setattr
> > after the old truncate code is removed.
> > 
> 
> I thought you meant inode_setattr will go away. There will
> only be simple_setattr() and inode_setattr_nosize()
> 
> For the time been simple_setattr() will also take care
> of old ->truncate FSs. And in the absence of .setattr
> simple_setattr() is called. Have I miss-understood?
> 
> again please tell me when all this is in effect I want
> to do the conversion in exofs.

AFAIKS inode_setattr basically is simple_setattr, so I think at some
point it should just get renamed to simple_setattr. Adding
simple_setattr_nosize or similar helper would be fine too. I don't
care much about the exact details... But anyway these things are not
so important to this truncate patchset at the moment.


> [BTW these changes are a life saver for me in regard to
> the kind of things I need to do for pNFS-exports]

You mean the truncate patches? Well that's nice to know. I
guess it has always been possible just to redefine your own
setattr, but now it should be a bit nicer with the truncate
helpers...

Thanks,
Nick
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