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From: "Aneesh Kumar K.V" <aneesh.kumar-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
To: Ted Ts'o <tytso-3s7WtUTddSA@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, 03 May 2012 13:57:21 +0530	[thread overview]
Message-ID: <87fwbhhdp2.fsf@skywalker.in.ibm.com> (raw)
In-Reply-To: <20120430114410.GB28308-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>

Ted Ts'o <tytso-3s7WtUTddSA@public.gmane.org> writes:

> It might also be a good idea to document explicitly whether or not
> things like fstat() and the syscalls to manipulate extended attributes
> are expected to work.
>

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)

Examples for O_PATH and handle syscall can be found in qemu and
handle-test repo 

http://git.qemu.org/?p=qemu.git;a=blob;f=hw/9pfs/virtio-9p-handle.c;h=f96d17a9749a6f672741ff4dcb98da81d1dcc3ce;hb=HEAD
https://github.com/kvaneesh/handle-test/blob/master/handle.h

-aneesh

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WARNING: multiple messages have this Message-ID (diff)
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: "Ted Ts'o" <tytso@mit.edu>
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, 03 May 2012 13:57:21 +0530	[thread overview]
Message-ID: <87fwbhhdp2.fsf@skywalker.in.ibm.com> (raw)
In-Reply-To: <20120430114410.GB28308@thunk.org>

Ted Ts'o <tytso@mit.edu> writes:

> It might also be a good idea to document explicitly whether or not
> things like fstat() and the syscalls to manipulate extended attributes
> are expected to work.
>

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)

Examples for O_PATH and handle syscall can be found in qemu and
handle-test repo 

http://git.qemu.org/?p=qemu.git;a=blob;f=hw/9pfs/virtio-9p-handle.c;h=f96d17a9749a6f672741ff4dcb98da81d1dcc3ce;hb=HEAD
https://github.com/kvaneesh/handle-test/blob/master/handle.h

-aneesh


  parent reply	other threads:[~2012-05-03  8:27 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 [this message]
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
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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