On Wed, Mar 16, 2011 at 10:54 AM, Petr Uzel <petr.uzel@suse.cz> wrote:
On Sun, Mar 13, 2011 at 06:03:20PM +0100, richard -rw- weinberger wrote:
Hi,
bind mounts seem not to work as expected on OpenSUSE 11.4.
Yes, it behaves slightly different as a consequence of making /etc/mtab a symlink to /proc/self/mounts.
It's documented in mount(8): --------- Note that behavior of the remount operation depends on the /etc/mtab file. The first command stores the 'bind' flag to the /etc/mtab file and the second command reads the flag from the file. If you have a system without the /etc/mtab file or if you explicitly define source and target for the remount command (then mount(8) does not read /etc/mtab), then you have to use bind flag (or option) for the remount command too. For example:
mount --bind olddir newdir mount -o remount,ro,bind olddir newdir ---------
E.g: $ mount /home /mnt -o bind $ mount | grep mnt /dev/sda1 on /mnt type ext3 (rw,relatime,errors=continue,user_xattr,acl,commit=600,barrier=0,data=ordered) $ mount | grep sda1 /dev/sda1 on / type ext3 (rw,relatime,errors=continue,user_xattr,acl,commit=600,barrier=0,data=ordered) /dev/sda1 on /mnt type ext3 (rw,relatime,errors=continue,user_xattr,acl,commit=600,barrier=0,data=ordered)
mount shows me the for both / and /mnt /dev/sda1 as device.
Information about bind mounts is missing in /proc/self/mounts and thus also in /etc/mtab. AFAIK this should and will be resolved with new util-linux, which will store the bind information into /dev/.mount/utab or something similar.
Will OpenSUSE 11.4 get an update to this new util-linux package?
The expected output is: /home on /mnt type none (rw,bind)
The read-only bind mount also does not work. $ mount -o bind,ro /home /mnt mount: warning: /mnt seems to be mounted read-write. $ mount | grep mnt /dev/sda1 on /mnt type ext3 (rw,relatime,errors=continue,user_xattr,acl,commit=600,barrier=0,data=ordered)
Try this: mount -o bind /home /mnt mount -o remount,ro,bind /mnt
This works fine. :-)
I can reproduce this on OpenSUSE 11.4 using kernel-desktop-2.6.37.1-1.2.2.i586, kernel-vanilla-2.6.37.1-1.2.2.i586 and kernel-vanilla-2.6.37.3-16.1.i586 (from tumbleweed repo)
But, on a CentOS 5.5 box with a hand compiled 2.6.37.3 kernel everything works as expected.
Now I'm confused, is this a OpenSUSE or a kernel issue?
util-linux (known) issue.
Ok.
HTH,
Petr
-- Petr Uzel IRC: ptr_uzl @ freenode
-- Thanks, //richard -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-kernel+help@opensuse.org