From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760590AbYECGc7 (ORCPT ); Sat, 3 May 2008 02:32:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754053AbYECGct (ORCPT ); Sat, 3 May 2008 02:32:49 -0400 Received: from 1wt.eu ([62.212.114.60]:3722 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751355AbYECGcs (ORCPT ); Sat, 3 May 2008 02:32:48 -0400 Date: Sat, 3 May 2008 08:32:31 +0200 From: Willy Tarreau To: NeilBrown Cc: Andrew Morton , Lothar =?iso-8859-1?Q?Wa=DFmann?= , linux-kernel@vger.kernel.org Subject: Re: linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem Message-ID: <20080503063231.GA688@1wt.eu> References: <18456.34604.472989.35082@ipc1.ka-ro> <20080501215231.297e0d9d.akpm@linux-foundation.org> <53722.192.168.1.70.1209711343.squirrel@neil.brown.name> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53722.192.168.1.70.1209711343.squirrel@neil.brown.name> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 02, 2008 at 04:55:43PM +1000, NeilBrown wrote: > On Fri, May 2, 2008 2:52 pm, Andrew Morton wrote: > > On Wed, 30 Apr 2008 16:50:20 +0200 Lothar Wa__mann > > wrote: > > > >> Hi, > > > > (y'know that ~4000 people read your email and hit 'n'? Except for me? > > That's one bug I'd like to get fixed) > > Tricky.... > > > > >> when trying to create a directory path with 'mkdir -p' with the root > >> being a mount point of a writeable filesystem that exists inside a > >> read-only file system, mkdir return -EROFS. > > My guess is that you have an old/buggy version of mkdir. > > What does > mkdir --version > > say? > Mine says: > mkdir (GNU coreutils) 6.10 > Copyright (C) 2008 Free Software Foundation, Inc. > etc... I would bet this is the problem for the reporter. I tried the same here, and cannot exhibit the problem. Just like the reporter, my / is ro and /dev is rw : # mkdir --version mkdir (coreutils) 5.2.1 ... # uname -a Linux alix-2C3 2.6.25-wt4-alix #3 Thu Apr 24 08:30:05 CEST 2008 i586 i586 i386 GNU/Linux (this is essentially 2.6.25+squashfs+some geode patches) # mount /dev/sda4 on / type ext3 (ro,errors=continue,data=ordered) /dev on /dev type tmpfs (rw,size=0k,nr_inodes=4096,mode=755) # mkdir -p /dev/a/b/c # ls -lad /dev/a/b/c drwxr-xr-x 2 root root 40 Jan 3 00:49 /dev/a/b/c/ # rmdir -p /dev/a/b/c rmdir: `/dev': Read-only file system # strace mkdir -p /dev/a/b/c stat64("/dev/a/b/c", 0xbf9175dc) = -1 ENOENT (No such file or directory) umask(0) = 022 open(".", O_RDONLY|O_LARGEFILE|O_DIRECTORY) = 3 chdir("/") = 0 mkdir("dev", 0755) = -1 EEXIST (File exists) stat64("dev", {st_mode=S_IFDIR|0755, st_size=17080, ...}) = 0 chdir("dev") = 0 mkdir("a", 0755) = 0 chdir("a") = 0 mkdir("b", 0755) = 0 chdir("b") = 0 umask(022) = 0 mkdir("c", 0777) = 0 fchdir(3) = 0 close(3) = 0 Regards, Willy