linux-kernel - Re: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks

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Date:	Wed, 25 Aug 2010 12:06:52 +1000
From:	Neil Brown <neilb@...e.de>
To:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Andreas Dilger <andreas.dilger@...cle.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	"adilger@....com" <adilger@....com>,
	"corbet@....net" <corbet@....net>,
	"npiggin@...nel.dk" <npiggin@...nel.dk>,
	"hooanon05@...oo.co.jp" <hooanon05@...oo.co.jp>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"miklos@...redi.hu" <miklos@...redi.hu>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"sfrench@...ibm.com" <sfrench@...ibm.com>,
	"philippe.deniel@....FR" <philippe.deniel@....FR>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks

On Mon, 23 Aug 2010 08:19:48 +0530
"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:

> On Mon, 23 Aug 2010 09:06:04 +1000, Neil Brown <neilb@...e.de> wrote:
> > [[ Following this approach I would like to avoid any filehandle-specific
> > syscalls altogether.
> > Just use a *at syscall with AT_FILE_HANDLE for filehandle lookup, and use
> > getxattr('system:linux.file_handle') to get the filehandle for a given path.
> > 
> > Ofcourse we would need to at *at versions of the *xattr syscalls, but that is
> > probably a good idea anyway.
> > ]]
> 
> sys_setxattrat would take 7 arguments.
>

I count 6 - assuming we share the 'flags' argument.  There are only 2 xattr
flags currently so there should be room to share.

  dirfd  path name value size flags == 6

NeilBrown
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