[PATCH] namespaces: incorporate fs namespace into nsproxy

This moves the mount namespace into the nsproxy.  The mount namespace count
now refers to the number of nsproxies point to it, rather than the number of
tasks.  As a result, the unshare_namespace() function in kernel/fork.c no
longer checks whether it is being shared.

Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Andrey Savochkin <saw@sw.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 11 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index c9e660ae47aa..33fcf0733ca6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1119,11 +1119,9 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 goto bad_fork_cleanup_mm;
         if ((retval = copy_namespaces(clone_flags, p)))
                 goto bad_fork_cleanup_keys;
-        if ((retval = copy_namespace(clone_flags, p)))
-                goto bad_fork_cleanup_namespaces;
         retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
         if (retval)
-                goto bad_fork_cleanup_namespace;
+                goto bad_fork_cleanup_namespaces;
 
         p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
         /*
@@ -1215,7 +1213,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 spin_unlock(&current->sighand->siglock);
                 write_unlock_irq(&tasklist_lock);
                 retval = -ERESTARTNOINTR;
-                goto bad_fork_cleanup_namespace;
+                goto bad_fork_cleanup_namespaces;
         }
 
         if (clone_flags & CLONE_THREAD) {
@@ -1263,8 +1261,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         proc_fork_connector(p);
         return p;
 
-bad_fork_cleanup_namespace:
-        exit_namespace(p);
 bad_fork_cleanup_namespaces:
         exit_task_namespaces(p);
 bad_fork_cleanup_keys:
@@ -1519,10 +1515,9 @@ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
  */
 static int unshare_namespace(unsigned long unshare_flags, struct namespace **new_nsp, struct fs_struct *new_fs)
 {
-        struct namespace *ns = current->namespace;
+        struct namespace *ns = current->nsproxy->namespace;
 
-        if ((unshare_flags & CLONE_NEWNS) &&
-            (ns && atomic_read(&ns->count) > 1)) {
+        if ((unshare_flags & CLONE_NEWNS) && ns) {
                 if (!capable(CAP_SYS_ADMIN))
                         return -EPERM;
 
@@ -1655,8 +1650,8 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
                 }
 
                 if (new_ns) {
-                        ns = current->namespace;
-                        current->namespace = new_ns;
+                        ns = current->nsproxy->namespace;
+                        current->nsproxy->namespace = new_ns;
                         new_ns = ns;
                 }