linux-kernel - Re: linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem

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Date:	Mon, 5 May 2008 09:28:24 +0200
From:	Willy Tarreau <w@....eu>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	NeilBrown <neilb@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem

On Mon, May 05, 2008 at 09:08:00AM +0200, Lothar Waßmann wrote:
> Hi,
> 
> Willy Tarreau writes:
> > > > open(".", O_RDONLY|O_LARGEFILE|O_DIRECTORY) = 3
> > > > chdir("/")                              = 0
> > > > mkdir("dev", 0755)                      = -1 EEXIST (File exists)
>                                                    ^^^^^^
> [...]
> > > This is what strace shows in my case:
> > > mkdir("/", 0777)                        = -1 EEXIST (File exists)
> > > stat64("/", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
> > > mkdir("/dev/", 0777)                    = -1 EROFS (Read-only file system)
>                                                  ^^^^^
> > What puzzles me is why you have this problem only with a new kernel.
> > I suspect that previous ones did report EEXIST and now we report
> > EROFS for an existing directory on an ro fs.
> > 
> Interestingly your strace output showed a return value of EEXIST where
> mine had EROFS.

Oh you're right! I did not notice. There's something odd here.
And I can reproduce it right now (2.6.25.1). I really have
EEXIST.

Willy

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