linux-kernel - Re: [PATCH] open(2): document O

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Message-ID: <20120503130707.GF18002@thunk.org>
Date:	Thu, 3 May 2012 09:07:07 -0400
From:	Ted Ts'o <tytso@....edu>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Mike Frysinger <vapier@...too.org>, linux-man@...r.kernel.org,
	viro@...iv.linux.org.uk, Richard Weinberger <richard@....at>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] open(2): document O_PATH

On Thu, May 03, 2012 at 01:57:21PM +0530, Aneesh Kumar K.V wrote:
> 
> fstat won't work, but fstatat with an empty path name would work. O_PATH
> descriptors are suppose to be used as "location only descriptors". 
> We then extended the *at syscalls to work with EMPTY pathnames so that
> O_PATH descriptors can be used with readlink, fchownat and fstatat().
> This was done to enable us to do these operation on symlinks.
> (65cfc6722361570bfe255698d9cd4dccaf47570d)

Could you define explicitly what you mean by "EMPTY" pathnames?  Do
you mean a path name that doesn't exist?  (i.e., one of the
directories specified in the pathname does not currently exist in the
directory hierarchy visible to the process).

					- Ted

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