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

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Date:	Fri, 4 May 2007 16:07:31 +1000
From:	David Chinner <dgc@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"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

On Thu, May 03, 2007 at 09:29:55PM -0700, Andrew Morton wrote:
> On Thu, 26 Apr 2007 23:33:32 +0530 "Amit K. Arora" <aarora@...ux.vnet.ibm.com> wrote:
> 
> > This patch implements the fallocate() system call and adds support for
> > i386, x86_64 and powerpc.
> > 
> > ...
> > +{
> > +	struct file *file;
> > +	struct inode *inode;
> > +	long ret = -EINVAL;
> > +
> > +	if (len == 0 || offset < 0)
> > +		goto out;
> 
> The posix spec implies that negative `len' is permitted - presumably "allocate
> ahead of `offset'".  How peculiar.

I just checked the man page for posix_fallocate() and it says:

      EINVAL  offset or len was less than zero.

We should probably follow this lead.

> > +
> > +	ret = -ENODEV;
> > +	if (!S_ISREG(inode->i_mode))
> > +		goto out_fput;
> 
> So we return ENODEV against an S_ISBLK fd, as per the posix spec.  That
> seems a bit silly of them.

Hmmmm - I thought that the intention of sys_fallocate() was to
be generic enough to eventually allow preallocation on directories.
If that is the case, then this check will prevent that....

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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