linux-kernel - Re: [PATCH] tmpfs: support SEEK_DATA and SEEK

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Date:	Thu, 29 Nov 2012 16:18:21 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	"Theodore Ts'o" <tytso@....edu>, Zheng Liu <wenqing.lz@...bao.com>,
	Jeff liu <jeff.liu@...cle.com>,
	Jim Meyering <jim@...ering.net>,
	Paul Eggert <eggert@...ucla.edu>,
	Christoph Hellwig <hch@...radead.org>,
	Josef Bacik <josef@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andreas Dilger <adilger@...ger.ca>,
	Dave Chinner <david@...morbit.com>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Chris Mason <chris.mason@...ionio.com>,
	Sunil Mushran <sunil.mushran@...cle.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] tmpfs: support SEEK_DATA and SEEK_HOLE (reprise)

On Thu, 29 Nov 2012 15:29:15 -0800 (PST)
Hugh Dickins <hughd@...gle.com> wrote:

> On Thu, 29 Nov 2012, Andrew Morton wrote:
> > On Wed, 28 Nov 2012 17:22:03 -0800 (PST)
> > Hugh Dickins <hughd@...gle.com> wrote:
> > 
> > > +/*
> > > + * llseek SEEK_DATA or SEEK_HOLE through the radix_tree.
> > > + */
> > > +static pgoff_t shmem_seek_hole_data(struct address_space *mapping,
> > > +				    pgoff_t index, pgoff_t end, int origin)
> > 
> > So I was starting at this wondering what on earth "origin" is and why
> > it has the fishy-in-this-context type "int".
> > 
> > There is a pretty well established convention that the lseek seek mode
> > is called "whence".
> > 
> > The below gets most of it.  Too anal?
> 
> No, not too anal: I'm all in favour of "whence", which is indeed
> the name of that lseek argument - since mediaeval times I believe.

Alas, the rest of us don't have personal memories from those days.

> It's good to have words like that in the kernel source: while you're
> in the mood, please see if you can find good homes for "whither" and
> "thrice" and "widdershins".

We use "thrice" quite a lot.  And "whither" once coz alfa peeps cnat spel. 
No widdershins yet.

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