On Wed, Apr 29, 2015 at 01:13:28PM +0200, Marko Cupa?? wrote:
> Hi,
>
> I have a firewall which was originally installed with 5.4 release, and
> it was configured to be resistant to sudden power outages by means of
> mounting / as read only, and /var and /dev partitions as mfs populated
> from /mfs/var and /mfs/dev. Here's fstab:
>
> e3f2007c8606c31a.a / ffs ro 1 1
> swap /var mfs rw,-P=/mfs/var,-s=32768,nodev,nosuid,noexec 0 0
> swap /dev mfs rw,-P=/mfs/dev,-s=8192,-i=128,nosuid,noexec 0 0
>
> Although this is non-critical box on local network, I wanted to keep it
> up to date so yesterday I upgraded it to 5.5 first, and then to 5.6. It
> appears that it no longer mounts / as read only.
>
> mount output shows the following:
> /dev/wd0a on / type ffs (local)
> mfs:15966 on /var type mfs (asynchronous, local, nodev, noexec, nosuid,
> size=32768 512-blocks)
> mfs:29006 on /dev type mfs (asynchronous, local, noexec, nosuid, size=8192
> 512-blocks)
>
> Trying to remount it as read/write says device busy:
> $ sudo mount -ur /
> mount_ffs: /dev/wd0a on /: Device busy
>
> What could be preventing read-only mount?
rc mounts / rw explicitly these days, to be able to write a random
generator seed for the next boot.
Why you cannot update to r/w I don't know, but fstat -f / might tell
you more. If a file on / is open for r/w, the mount -u wil fail, as
documented.
-Otto
>
> Thank you in advance,
> --
> Marko Cupa??
> https://www.mimar.rs
