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authorPavel Emelyanov <xemul@openvz.org>2007-10-18 23:40:10 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:39 -0700
commit30e49c263e36341b60b735cbef5ca37912549264 (patch)
tree103e74c41db97476ae38cdd4ffc18e4da03f28e8 /fs
parentb461cc03828c743aed6b3855b9ab0d39a9d54ec5 (diff)
pid namespaces: allow cloning of new namespace
When clone() is invoked with CLONE_NEWPID, create a new pid namespace and then create a new struct pid for the new process. Allocate pid_t's for the new process in the new pid namespace and all ancestor pid namespaces. Make the newly cloned process the session and process group leader. Since the active pid namespace is special and expected to be the first entry in pid->upid_list, preserve the order of pid namespaces. The size of 'struct pid' is dependent on the the number of pid namespaces the process exists in, so we use multiple pid-caches'. Only one pid cache is created during system startup and this used by processes that exist only in init_pid_ns. When a process clones its pid namespace, we create additional pid caches as necessary and use the pid cache to allocate 'struct pids' for that depth. Note, that with this patch the newly created namespace won't work, since the rest of the kernel still uses global pids, but this is to be fixed soon. Init pid namespace still works. [oleg@tv-sign.ru: merge fix] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Paul Menage <menage@google.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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