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    SubjectRe: [PATCH] proc: fix mount -t proc -o AAA
    On Sunday 25 of March 2012, Vasiliy Kulikov wrote:
    > On Sun, Mar 25, 2012 at 09:24 +0200, Arkadiusz Miśkiewicz wrote:
    > > but there is another problem - unmounting it and mounting without options
    > > causes old option to persist:
    > >
    > > # mount none /proc -t proc -o hidepid=2
    > > # umount /proc
    > > # mount none /proc -t proc
    > > # grep "/proc" /proc/mounts
    > > none /proc proc rw,relatime,hidepid=2 0 0
    > >
    > > There should be no hidepid=2 now.
    > No, that's an expected behaviour.
    > Procfs is a special filesystem. Mount options are not reset on each
    > mount(2) as you can mount procfs multiple times at different mount points
    > (/proc/, /aaa/proc/, etc.). Each time you add mount options they are
    > applied to _each_ mount point because there is no per-mount point sb, but
    > there is a per pid_ns superblock: pid_ns itself. All options are stored
    > at pid_ns.
    > When you mount it another time without any option nothing should change
    > at the old mount points. When you umount the last mount point all mount
    > options are still stored. When you mount it again old options are used
    > (unless you override them).

    I wonder if it should support noxx options then (like nogid, nohidepid) ?

    Arkadiusz Miśkiewicz PLD/Linux Team
    arekm /
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