Messages in this thread | | | From | Arkadiusz Miśkiewicz <> | Subject | Re: [PATCH] proc: fix mount -t proc -o AAA | Date | Sun, 25 Mar 2012 19:40:58 +0200 |
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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 / maven.pl http://ftp.pld-linux.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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