From: Ted Ts'o <tytso-3s7WtUTddSA@public.gmane.org>
To: "Aneesh Kumar K.V"
<aneesh.kumar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
Cc: "Michael Kerrisk (man-pages)"
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Mike Frysinger <vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org>,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
Richard Weinberger <richard-/L3Ra7n9ekc@public.gmane.org>,
lkml <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH] open(2): document O_PATH
Date: Thu, 3 May 2012 09:07:07 -0400 [thread overview]
Message-ID: <20120503130707.GF18002@thunk.org> (raw)
In-Reply-To: <87fwbhhdp2.fsf-6yE53ggjAfyqSkle7U1LjlaTQe2KTcn/@public.gmane.org>
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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WARNING: multiple messages have this Message-ID (diff)
From: "Ted Ts'o" <tytso@mit.edu>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>,
Mike Frysinger <vapier@gentoo.org>,
linux-man@vger.kernel.org, viro@zeniv.linux.org.uk,
Richard Weinberger <richard@nod.at>,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] open(2): document O_PATH
Date: Thu, 3 May 2012 09:07:07 -0400 [thread overview]
Message-ID: <20120503130707.GF18002@thunk.org> (raw)
In-Reply-To: <87fwbhhdp2.fsf@skywalker.in.ibm.com>
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
next prev parent reply other threads:[~2012-05-03 13:07 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-29 3:25 [PATCH] open(2): document O_PATH Mike Frysinger
[not found] ` <1335669917-23970-1-git-send-email-vapier-aBrp7R+bbdUdnm+yROfE0A@public.gmane.org>
2012-04-29 21:39 ` Michael Kerrisk (man-pages)
2012-04-29 21:39 ` Michael Kerrisk (man-pages)
2012-04-30 7:39 ` Aneesh Kumar K.V
2012-04-30 7:39 ` Aneesh Kumar K.V
2012-04-30 11:44 ` Ted Ts'o
[not found] ` <20120430114410.GB28308-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2012-05-03 6:48 ` Michael Kerrisk (man-pages)
2012-05-03 6:48 ` Michael Kerrisk (man-pages)
2012-05-03 8:27 ` Aneesh Kumar K.V
2012-05-03 8:27 ` Aneesh Kumar K.V
[not found] ` <87fwbhhdp2.fsf-6yE53ggjAfyqSkle7U1LjlaTQe2KTcn/@public.gmane.org>
2012-05-03 13:07 ` Ted Ts'o [this message]
2012-05-03 13:07 ` Ted Ts'o
[not found] ` <20120503130707.GF18002-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2012-05-03 13:20 ` Al Viro
2012-05-03 13:20 ` Al Viro
2012-05-06 1:00 ` H. Peter Anvin
2012-05-06 1:00 ` H. Peter Anvin
[not found] ` <877gwxacti.fsf-6yE53ggjAfyqSkle7U1LjlaTQe2KTcn/@public.gmane.org>
2012-05-03 6:47 ` Michael Kerrisk (man-pages)
2012-05-03 6:47 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkiRH8p=Dp1tqkb3D9oRVCOSnj2bofgFN5x2svntN7vtPg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-05-03 14:04 ` Aneesh Kumar K.V
2012-05-03 14:04 ` Aneesh Kumar K.V
[not found] ` <87bom5xswc.fsf-6yE53ggjAfyqSkle7U1LjlaTQe2KTcn/@public.gmane.org>
2012-05-03 14:11 ` Al Viro
2012-05-03 14:11 ` Al Viro
[not found] ` <20120503141156.GP6871-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2012-05-05 11:31 ` Michael Kerrisk (man-pages)
2012-05-05 11:31 ` Michael Kerrisk (man-pages)
2013-01-08 18:52 ` Al Viro
2013-01-08 18:52 ` Al Viro
-- strict thread matches above, loose matches on Subject: below --
2013-03-14 9:35 Michael Kerrisk (man-pages)
2013-03-14 9:35 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkgWiANFA1Z7o2EQmKmsMzzpa1ga2ggLeX3Bo58QmjDx6g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-04-13 2:17 ` Geoffrey Thomas
[not found] ` <alpine.DEB.2.02.1304121917230.29639-TW+ixCjnw15HKceWYcIGBEp/09x8KikSkwxctJ+8KrKSEQKx1GYgKAC/G2K4zDHf@public.gmane.org>
2013-07-20 21:07 ` Michael Kerrisk
2013-07-20 11:40 ` Al Viro
2013-07-20 11:40 ` Al Viro
[not found] ` <20130720114017.GA2118-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2013-07-20 20:56 ` Michael Kerrisk
2013-07-20 20:56 ` Michael Kerrisk
[not found] ` <51EAF997.2090300-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-07-22 8:46 ` Peter Schiffer
2013-07-22 8:46 ` Peter Schiffer
[not found] ` <51ECF166.4080007-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-07-22 10:45 ` Michael Kerrisk (man-pages)
2013-07-22 10:45 ` Michael Kerrisk (man-pages)
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