On Mon, 2007-10-08 at 14:28 +0200, Matthias Koenig wrote:
> Ian Kent <[EMAIL PROTECTED]> writes:
>
> > On Tue, 2007-09-25 at 18:21 +0200, Matthias Koenig wrote:
> >> Hi,
> >>
> >> we noticed a problem concerning loop mounts on locations that
> >> have to be mounted before. E.g. consider the following situation,
> >> a NFS server exporting a cd image, which we want to loop mount
> >> locally to get access to the content:
> >>
> >> auto.master:
> >> /cdimage auto.cdimage
> >> /cdcontent auto.cdcontent
> >>
> >> auto.cdimage:
> >> foo nfsserver:/cdimage/foo.img
> >>
>
> Yes, sorry. It is nfsserver:/cdimage/foo of course.
> I invented this testcase in place, because the original setup
> was less readable.
>
> >> auto.cdcontent:
> >> foo -fstype=auto,loop :/cdimage/foo/foo.img
> >>
> >> The access to /cdcontent/foo will fail, when /cdimage/foo is not
> >> mounted before, because spawn_mount does not use SPAWN_OPT_ACCESS
> >> in this case.
> >
> > This test case seems broken to me.
> > Can you check you've described this correctly please.
> > Maybe even try this exact setup yourself.
>
> I checked this again and adapt it to the testcase described here.
> auto.master remaining as shown above.
>
> giuliani:/ # cat /etc/auto.cdimage
> foo dist:/dist/install/openSUSE-10.3-GM/
>
> giuliani:/ # cat /etc/auto.cdcontent
> foo -fstype=auto,loop,ro :/cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso
>
> > Even if the maps were correct the procedure you describe wouldn't call
> > spawn_mount first, it would call spawn_bind_mount, which would then
> > trigger the mount through the access call.
>
> Hmm, with the above setup, I am only able to access the content after I
> have triggered the mount of the image separately.
Mmm .. but my comment above assumes you're autofs build uses the
configure option --disable-mount-locking.
Is that correct?
If not then this can't be done because the locking will cause a
deadlock, consequently the code that calls access isn't compiled in and
recursive mounts aren't possible.
>
> giuliani:/ # ls /cdcontent/foo
> ls: cannot open directory /cdcontent/foo: No such file or directory
> giuliani:/ # ls /cdimage/foo/
> [...]
> giuliani:/ # ls /cdcontent/foo
> ARCHIVES.gz dosutils INDEX.gz
> [...]
>
> Here is the log of the failure:
> Oct 8 14:25:17 giuliani automount[16597]: lookup_mount: lookup(file):
> looking up foo
> Oct 8 14:25:17 giuliani automount[16597]: lookup_mount: lookup(file): foo ->
> -fstype=auto,loop,ro :/cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso
> Oct 8 14:25:17 giuliani automount[16597]: parse_mount: parse(sun): expanded
> entry: -fstype=auto,loop,ro :/cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso
> Oct 8 14:25:17 giuliani automount[16597]: parse_mount: parse(sun): gathered
> options: fstype=auto,loop,ro
> Oct 8 14:25:17 giuliani automount[16597]: parse_mount: parse(sun):
> dequote(":/cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso") ->
> :/cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso
> Oct 8 14:25:17 giuliani automount[16597]: parse_mount: parse(sun): core of
> entry: options=fstype=auto,loop,ro,
> loc=:/cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso
> Oct 8 14:25:17 giuliani automount[16597]: sun_mount: parse(sun): mounting
> root /cdcontent, mountpoint foo, what
> /cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso, fstype auto, options loop,ro
> Oct 8 14:25:17 giuliani automount[16597]: open_mount: (mount):cannot open
> mount module auto (/usr/lib/autofs/mount_auto.so: cannot open shared object
> file: No such file or directory)
> Oct 8 14:25:17 giuliani automount[16597]: do_mount:
> /cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso /cdcontent/foo type auto options
> loop,ro using module generic
> Oct 8 14:25:17 giuliani automount[16597]: mount_mount: mount(generic):
> calling mkdir_path /cdcontent/foo
> Oct 8 14:25:17 giuliani automount[16597]: mount_mount: mount(generic):
> calling mount -t auto -s -o loop,ro
> /cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso /cdcontent/foo
> Oct 8 14:25:17 giuliani automount[16597]: >>
> /cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso: No such file or directory
> Oct 8 14:25:17 giuliani automount[16597]: mount(generic): failed to mount
> /cdimage/foo/openSUSE-10.3-GM-DVD-i386.iso (type auto) on /cdcontent/foo
> Oct 8 14:25:17 giuliani automount[16597]: send_fail: token = 61
> Oct 8 14:25:17 giuliani automount[16597]: failed to mount /cdcontent/foo
>
>
> Thanks,
> Matthias
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