linux-kernel - Re: [RFC] Heads up on sys

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Message-Id: <20070302090105.43f9b41c.akpm@linux-foundation.org>
Date:	Fri, 2 Mar 2007 09:01:05 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	Eric Sandeen <sandeen@...hat.com>,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	ext4 <linux-ext4@...r.kernel.org>, suparna@...ibm.com,
	cmm@...ibm.com, alex@...sterfs.com, suzuki@...ibm.com
Subject: Re: [RFC] Heads up on sys_fallocate()

On Fri, 02 Mar 2007 08:13:00 -0800 Badari Pulavarty <pbadari@...ibm.com> wrote:

> > 
> > > What about 
> > > if the
> > > blocks already exists ? What would be return values in those cases ?
> > 
> > 0 on success, other normal errors oetherwise..
> > 
> > If asked for a range that includes already-allocated blocks, you just 
> > allocate any non-allocated blocks in the range, I think.
> 
> Yes. What I was trying to figure out is, if there is a requirement that
> interface need to return exact number of bytes it *really* allocated
> (like write() or read()). I can't think of any, but just wanted to
> through it out..

Hopefully not, because posix didn't anticipate that.

We could of course return a positive number on success, but it'd get
tricky on 32-bit machines.

> BTW, what is the interface for finding out what is the size of the
> pre-allocated file ? 

stat.st_blocks?
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