Re: [patch -mm 0/4] mqueue namespace
- From: ebiederm@xxxxxxxxxxxx (Eric W. Biederman)
- Date: Thu, 19 Jun 2008 20:39:44 -0700
ebiederm@xxxxxxxxxxxx (Eric W. Biederman) writes:
One way to fix that is to add a hidden directory to the mnt namespace.
Where magic in kernel filesystems can be mounted. Only visible
with a magic openat flag. Then:
fd = openat(AT_FDKERN, ".", O_DIRECTORY)
fchdir(fd);
umount("./mqueue", MNT_DETACH);
mount(("none", "./mqueue", "mqueue", 0, NULL);
Would unshare the mqueue namespace.
Implemented for plan9 this would solve a problem of how do you get
access to all of it's special filesystems. As only bind mounts
and remote filesystem mounts are available. For linux thinking about
it might shake the conversation up a bit.
Thinking about this some more. What is especially attractive if we do
all namespaces this way is that it solves two lurking problems.
1) How do you keep a namespace around without a process in it.
2) How do you enter a container.
If we could land the namespaces in the filesystem we could easily
persist them past the point where a process is present in one if we so
choose.
Entering a container would be a matter of replacing your current
namespaces mounts with namespace mounts take from the filesystem.
I expect performance would degrade in practice, but it is tempting
to implement it and run a benchmark and see if we can measure anything.
Eric
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