From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx> 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 <sukadev@xxxxxxxxxx> Cc: Cedric Le Goater <clg@xxxxxxxxxx> Cc: Dave Hansen <haveblue@xxxxxxxxxx> Cc: Serge Hallyn <serue@xxxxxxxxxx> Cc: containers@xxxxxxxxxxxxxx --- _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxx https://lists.osdl.org/mailman/listinfo/containers
