linux-kernel - Re: [PATCH 1/5] fallocate() implementation in i86, x86

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Date:	Mon, 07 May 2007 06:08:43 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Jakub Jelinek <jakub@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Chinner <dgc@....com>,
	"Amit K. Arora" <aarora@...ux.vnet.ibm.com>,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, suparna@...ibm.com, cmm@...ibm.com
Subject: Re: [PATCH 1/5] fallocate() implementation in i86, x86_64 and powerpc

Jakub Jelinek wrote:
> is what glibc does ATM.  Seems we violate the case where len == 0, as
> EINVAL in that case is "shall fail".  But reading the standard to imply
> negative len is ok is too much guessing, there is no word what it means
> when len is negative and
> "required storage for regular file data starting at offset and continuing for len bytes"
> doesn't make sense for negative size.  

This wording has already been cleaned up.  The current draft for the 
next revision reads:


[EINVAL] The len argument is less than or equal to zero, or the offset
  argument is less than zero, or the underlying file system does not
  support this operation.


I still don't like it since len==0 shouldn't create an error (it's 
inconsistent) but len<0 is already outlawed.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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