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

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Message-ID: <m3eidtsrkj.fsf@linux.vnet.ibm.com>
Date:	Fri, 20 Aug 2010 12:23:32 +0530
From:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	hch@...radead.org, viro@...iv.linux.org.uk, adilger@....com,
	corbet@....net, neilb@...e.de, hooanon05@...oo.co.jp,
	bfields@...ldses.org, miklos@...redi.hu
Cc:	linux-fsdevel@...r.kernel.org, sfrench@...ibm.com,
	philippe.deniel@....FR, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks

On Fri, 20 Aug 2010 07:43:12 +0530, "Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> On Fri, 20 Aug 2010 07:21:28 +0530, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> > The patch update may_open to allow handle based open on symlinks.
> > The file handle based API use file descritor returned from open_by_handle_at
> > to do different file system operations. To find the link target name we
> > need to get a file descriptor on symlinks.
> > 
> > We should be able to read the link target using file handle. The exact
> > usecase is with respect to implementing READLINK operation on a
> > userspace NFS server. The request contain the file handle and the
> > response include target name.
> > 
> 
> If we don't do this, we will need new syscalls for doing stat, readlink
> and link on symlinks that take file handle as the argument. If that is ok,
> I can redo the patch series accordingly.
> 

This ended up with the below new syscalls

sys_handle_readlink, sys_handle_stat64, sys_handle_link, sys_handle_chown,
sys_handle_setxattr, sys_handle_getxattr, sys_handle_listxattr,
sys_handle_removexattr, sys_handle_utimes, compat_sys_handle_utimes

-aneesh
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