linux-kernel - Re: [patch 3/5] VFS: pass open file to ->xattr()

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Date:	Fri, 21 Sep 2007 10:32:31 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	hch@...radead.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [patch 3/5] VFS: pass open file to ->xattr()

On Fri, 2007-09-21 at 15:16 +0200, Miklos Szeredi wrote:

> > ftruncate is a special case due to O_TRUNC.
> 
> No, it's special, because it does not do permission checking, while
> truncate() does.

So why not just add file->f_op->ftruncate() and file->f_op->fstat()?
Most filesystems can trivially redirect these to do_truncate() and their
existing getattr() method. Those, like FUSE, that care can use the hook.
In fact, I think that NFSv4 could also benefit from an ftruncate():
currently we have to hunt around for an open file context for that
particular case.

Trond

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