From: Sukadev Bhattiprolu <[EMAIL PROTECTED]>
Subject [RFC][PATCH 0/5] Remove nsproxy->pid_ns
We need to decouple pid namespace from nsproxy to allow getting and
releasing pid namespace independently from other namespaces. This is
required since a process's reference to its pid namespace must exist
even after its references to other namespaces are dropped during
process exit.
This patchset accomplishes this by using the pid->pid_nrs list defined
in earlier patches. As noted from that patchset, pid->pid_nrs list
allows each process to have multiple pid_t values, one per each namespace.
We define a task's clone-pid-namespace as the pid namespace that the
process last unshared into. If the process never unshared its pid namespace,
then its clone-pid-namespace is same as its parent clone-pid-namespace
(possibly init-pid-ns), when the process was created.
When a process unshares its pid namespace, we allocate a new struct pid_nr
and attach this pid_nr at the head of the pid->pid_nrs list.
The task_pid_ns() wrapper always returns this clone-pid-ns of the task
and returns the pid namespace from the head of the pid->pid_nrs list.
This patch set includes following 5 patches:
[PATCH 1/5]
Rename *namespaces() functions to *nsproxy() to reflect that
these functions only operate on an nsproxy and not on all
namespaces.
[PATCH 2/5]
Define helper functions to use as we move pid namespace out of
nsproxy
[PATCH 3/5]
Use pid_namespace in struct pid_nr rather than nsproxy->pid_ns.
[PATCH 4/5]
Remove the struct pid_namespace * from struct nsproxy
[PATCH 5/5]
Remove the now-unused function, copy_pid_ns().
Signed-off-by: Sukadev Bhattiprolu <[EMAIL PROTECTED]>
Cc: Cedric Le Goater <[EMAIL PROTECTED]>
Cc: Dave Hansen <[EMAIL PROTECTED]>
Cc: Serge Hallyn <[EMAIL PROTECTED]>
Cc: [EMAIL PROTECTED]
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