linux-kernel - Re: [PATCH -V14 04/11] vfs: Allow handle based open on symlinks

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Date:	Thu, 8 Jul 2010 04:20:01 +1000
From:	Nick Piggin <npiggin@...e.de>
To:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	hch@...radead.org, viro@...iv.linux.org.uk, adilger@....com,
	corbet@....net, serue@...ibm.com, neilb@...e.de,
	hooanon05@...oo.co.jp, bfields@...ldses.org,
	linux-fsdevel@...r.kernel.org, sfrench@...ibm.com,
	philippe.deniel@....FR, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V14 04/11] vfs: Allow handle based open on symlinks

On Wed, Jul 07, 2010 at 11:23:31PM +0530, Aneesh Kumar K. V wrote:
> On Thu, 8 Jul 2010 02:57:19 +1000, Nick Piggin <npiggin@...e.de> wrote:
> > I haven't followed this thread closely, so can you just go back
> > and explain to me why you need this? Ie. that you can't achieve with
> > a path-to-handle follow/nofollow option.
> 
> 
> We need to be able to read the link target using file handle. The exact
> usecase i have is with respect to implementing READLINK operation on a
> userspace NFS server. The request contain the file handle and the
> response include target name.

Fair point, could you include this stuff in your changelog? It may
help with other people reviewing it too who have not followed closely.

 
> Similarly we need to able to get file attribute based on file handle.
> I was using readlinkat and fstat to obtain both the above information
> using the descriptor returned by open_by_handle on a file handle
> representing symlink
> 
> -aneesh
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