linux-ext4 - Re: [PATCH] vfs: allow custom EOF in generic_file

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Message-ID: <20120428183315.GA28349@parisc-linux.org>
Date:	Sat, 28 Apr 2012 12:33:15 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	ext4 development <linux-ext4@...r.kernel.org>,
	Andreas Dilger <adilger@...ger.ca>,
	Bernd Schubert <bernd.schubert@...m.fraunhofer.de>
Subject: Re: [PATCH] vfs: allow custom EOF in generic_file_llseek code

On Fri, Apr 27, 2012 at 11:21:04AM -0500, Eric Sandeen wrote:
> As far as I know, this does not fix any bugs - nfs in the kernel
> doesn't use SEEK_END, and I don't know of any user who does.  But
> some ext4 folks seem keen on doing the right thing here, and I can't
> really argue.

I like it.  In particular it removes a lot of calls to i_size_read() which
may have some nice benefits on 32-bit systems.  

However, there is only one call to generic_file_llseek_size() in the
kernel (and it's in ext4!)  I would suggest simply changing the prototype
of generic_file_llseek_size ... or if you insist, just renaming it to
generic_file_llseek_size_eof().

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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