Can't remove 'noatime' on mounted filesystem on CURRENT
Scot Hetzel
swhetzel at gmail.com
Thu Aug 9 06:53:48 PDT 2007
On 8/9/07, Karol Kwiatkowski <karol.kwiat at gmail.com> wrote:
> It seems to be impossible to remove 'noatime' property on mounted
> filesystem (via -u option):
>
> # mount | grep ad0s3e
> /dev/ad0s3e on /data (ufs, local, noexec, nosuid, soft-updates)
> # mount -u -o noatime /data
> # mount | grep ad0s3e
> /dev/ad0s3e on /data (ufs, local, noatime, soft-updates)
> # mount -u -o atime /data
> # mount | grep ad0s3e
> /dev/ad0s3e on /data (ufs, local, noatime, soft-updates)
>
> This works on 6.2-RELEASE.
>
> Btw, setting 'noatime' removes 'noexec' and 'nosuid' in above example.
> Is this expected behaviour? Can't decide after reading mount(8).
>
hp010# mount -u -o noexec,nosuid /tmp ; mount | grep tmp
/dev/ad1s2e on /tmp (ufs, local, noexec, nosuid)
hp010# mount -u -o noatime /tmp ; mount | grep tmp
/dev/ad1s2e on /tmp (ufs, local, noatime)
hp010# mount -u -o noexec,nosuid /tmp ; mount | grep tmp
/dev/ad1s2e on /tmp (ufs, local, noatime, noexec, nosuid)
hp010# mount -u -o noatime /tmp ; mount | grep tmp
/dev/ad1s2e on /tmp (ufs, local, noatime)
hp010# mount -u -o atime /tmp ; mount | grep tmp
/dev/ad1s2e on /tmp (ufs, local, noatime)
The only way to get rid of noatime is to umount and remount the UFS filesystem.
ZFS seems to have a similar problem with resetting the atime, exec,
and setuid mount options when used with mount.
hp010# umount /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
hp010# zfs mount -a
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local)
hp010# mount -u -o noexec,nosuid /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec off temporary
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local,
noexec, nosuid)
Why doesn't the setuid property change to 'temporary' for
rootpool/usr/ports/distfiles?
hp010# mount -u -o exec,suid /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec off temporary
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local,
noexec, nosuid)
mount can't get rid of these options.
hp010# mount -u -o noatime /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime off temporary
rootpool/usr/ports/distfiles exec off temporary
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local,
noatime, noexec, nosuid)
hp010# mount -u -o atime /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime off temporary
rootpool/usr/ports/distfiles exec off temporary
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local,
noatime, noexec, nosuid)
Same problem with getting rid of noatime. I would have expected mount
to be able to be able to change the zfs properties of atime, exec back
to on.
hp010# zfs inherit -r atime rootpool/usr/ports/distfiles
hp010# zfs inherit -r exec rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, nosuid)
hp010# zfs set setuid=off rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid off local
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, nosuid)
hp010# zfs inherit -r setuid rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local)
We have now set everything back to the default mount options using 'zfs inherit'
hp010# mount -u -o noatime,noexec,nosuid /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, nosuid)
Now mount can't set noatime or noexec.
hp010# zfs inherit -r setuid rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local)
Back to the defaults again.
This last part gets a bit strange, without umounting
/usr/ports/distfiles, I tried the following:
hp010# mount -u -o nosuid /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, nosuid)
hp010# zfs set setuid=off rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid off local
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, nosuid)
hp010# zfs inherit -r setuid rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local)
hp010# mount -u -o noatime,noexec,nosuid /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec off temporary
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local,
noexec, nosuid)
hp010# zfs inherit -r setuid rootpool/usr/ports/distfiles
hp010# zfs inherit -r exec rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local)
hp010# mount -u -o noatime,noexec,nosuid /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec off temporary
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local,
noexec, nosuid)
It won't set noatime when noexec and nosuid are specified.
hp010# mount -u -o noatime /usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local, nosuid)
Now it removed noexec, and didn't set noatime.
hp010# zfs inherit -r setuid rootpool/usr/ports/distfiles
hp010# zfs get atime,exec,setuid rootpool/usr/ports/distfiles ; mount
| grep distfiles
NAME PROPERTY VALUE SOURCE
rootpool/usr/ports/distfiles atime on default
rootpool/usr/ports/distfiles exec on default
rootpool/usr/ports/distfiles setuid on default
rootpool/usr/ports/distfiles on /usr/ports/distfiles (zfs, local)
Scot
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