Date: Thu, 9 Aug 2007 08:53:45 -0500 From: "Scot Hetzel" <swhetzel@gmail.com> To: karol.kwiat@gmail.com Cc: freebsd-current@freebsd.org Subject: Re: Can't remove 'noatime' on mounted filesystem on CURRENT Message-ID: <790a9fff0708090653ld9ee781vead81f533ff5e38c@mail.gmail.com> In-Reply-To: <46BAF87E.8020406@gmail.com> References: <46BAF87E.8020406@gmail.com>
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On 8/9/07, Karol Kwiatkowski <karol.kwiat@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 -- DISCLAIMER: No electrons were mamed while sending this message. Only slightly bruised.
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