Re: [RFC][PATCH 20/20] proc: Update /proc to support multiple pid spaces.

Hello,

This patch does a couple of things.
- It splits proc into proc and proc_sysinfo
- It adds pspace support to proc
- It adds getattr methods to ensure proc has the proper hard link count.
- It increases the size of a couple of buffers by one to avoid buffer overflow
- It moves /proc/mounts and /proc/loadavg into the proc filesystem from proc_sysinfo

Sorry for the big patch.  When I start feeding this changes seriously I will
split this patch.

The split of /proc into mutliple filesystems works well however it comes
with one downsides.  There are now some directories where cd -P <subdir>/..
is not a noop.  Basically it is doing the equivalent of following symlinks
into an internal kernel mount.  It is well defined and safe behaviour but
I'm not certain if it is desirable.

Signed-off-by: Eric W. Biederman <[email protected]>

This one is really ugly.

And it is also controversial to your own idea of having separate namespaces, but introduces a pointer to proc_mnt in pspace.

You have many namespaces to which task_struct refers.
Do you want proc to work in any configuration of namespaces?
Then you can't have pointers to proc_mnt from namespaces.
Well, I understand that proc is the most painfull for you... yeah...

Kirill

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• Follow-Ups:
  • Re: [RFC][PATCH 20/20] proc: Update /proc to support multiple pid spaces.
    • From: [email protected] (Eric W. Biederman)

• References:
  • [RFC][PATCH 0/20] Multiple instances of the process id namespace
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 01/20] pid: Intoduce the concept of a wid (wait id)
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 02/20] pspace: The parent process id of pid 1 is always 0.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 03/20] pid: Introduce a generic helper to test for init.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 04/20] pspace: Allow multiple instaces of the process id namespace
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 05/20] sched: Fixup the scheduler syscalls to deal with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 06/20] cad_pid: Fixup the cad_pid users to assume it is in the initial process id namespace.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 07/20] tty: Update the tty layer to work with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 08/20] vt: Update the virtual console to handle pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 09/20] ptrace: Update ptrace handle pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 10/20] capabilities: Update the capabilities code to handle pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 11/20] ioprio: Update ioprio to handle pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 12/20] fcntl: Update fcntl to work with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 13/20] kthread: Update kthread to work with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 14/20] mm: Update vmscan to work with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 15/20] posix-timers: Update posix timers to work with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [PATCH 16/20] nfs: Don't use pids to track the lockd server process.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 17/20] usb: Fixup usb so it works with pspaces.
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 18/20] posix-mqueue: Make mqueues work with pspspaces
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 19/20] pspace: Upcate the pid_max sysctl to work in a per pspace fashion
    • From: [email protected] (Eric W. Biederman)
  • [RFC][PATCH 20/20] proc: Update /proc to support multiple pid spaces.
    • From: [email protected] (Eric W. Biederman)

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