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authorSerge E. Hallyn <serue@us.ibm.com>2007-10-19 10:39:45 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 22:53:37 +0400
commit858d72ead4864da0fb0b89b919524125ce998e27 (patch)
tree19ea321ca3b505efecb2053a829daf89a6a22529 /kernel/nsproxy.c
parent846c7bb055747989891f5cd2bb6e8d56243ba1e7 (diff)
downloadlinux-858d72ead4864da0fb0b89b919524125ce998e27.tar.xz
cgroups: implement namespace tracking subsystem
When a task enters a new namespace via a clone() or unshare(), a new cgroup is created and the task moves into it. This version names cgroups which are automatically created using cgroup_clone() as "node_<pid>" where pid is the pid of the unsharing or cloned process. (Thanks Pavel for the idea) This is safe because if the process unshares again, it will create /cgroups/(...)/node_<pid>/node_<pid> The only possibilities (AFAICT) for a -EEXIST on unshare are 1. pid wraparound 2. a process fails an unshare, then tries again. Case 1 is unlikely enough that I ignore it (at least for now). In case 2, the node_<pid> will be empty and can be rmdir'ed to make the subsequent unshare() succeed. Changelog: Name cloned cgroups as "node_<pid>". [clg@fr.ibm.com: fix order of cgroup subsystems in init/Kconfig] Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/nsproxy.c')
-rw-r--r--kernel/nsproxy.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 049e7c0ac566..ac99837e7a04 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -156,7 +156,14 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
goto out;
}
+ err = ns_cgroup_clone(tsk);
+ if (err) {
+ put_nsproxy(new_ns);
+ goto out;
+ }
+
tsk->nsproxy = new_ns;
+
out:
put_nsproxy(old_ns);
return err;
@@ -196,8 +203,16 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
*new_nsp = create_new_namespaces(unshare_flags, current,
new_fs ? new_fs : current->fs);
- if (IS_ERR(*new_nsp))
+ if (IS_ERR(*new_nsp)) {
err = PTR_ERR(*new_nsp);
+ goto out;
+ }
+
+ err = ns_cgroup_clone(current);
+ if (err)
+ put_nsproxy(*new_nsp);
+
+out:
return err;
}