[PATCH 3/5] NFS: Abstract out namespace initialisation [try #2]

[David Howells <dhowells@redhat.com>]

The attached patch abstracts out the namespace initialisation so that temporary
namespaces can be set up elsewhere.

Signed-Off-By: David Howells <dhowells@redhat.com>
---

 fs/namespace.c            |    8 +-------
 include/linux/namespace.h |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 51d3ebc..0194538 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1688,13 +1688,7 @@ static void __init init_mount_tree(void)
 	namespace = kmalloc(sizeof(*namespace), GFP_KERNEL);
 	if (!namespace)
 		panic("Can't allocate initial namespace");
-	atomic_set(&namespace->count, 1);
-	INIT_LIST_HEAD(&namespace->list);
-	init_waitqueue_head(&namespace->poll);
-	namespace->event = 0;
-	list_add(&mnt->mnt_list, &namespace->list);
-	namespace->root = mnt;
-	mnt->mnt_namespace = namespace;
+	init_namespace(namespace, mnt);
 
 	init_task.namespace = namespace;
 	read_lock(&tasklist_lock);
diff --git a/include/linux/namespace.h b/include/linux/namespace.h
index 3abc8e3..ea6fd62 100644
--- a/include/linux/namespace.h
+++ b/include/linux/namespace.h
@@ -17,6 +17,21 @@ extern int copy_namespace(int, struct ta
 extern void __put_namespace(struct namespace *namespace);
 extern struct namespace *dup_namespace(struct task_struct *, struct fs_struct *);
 
+static inline void init_namespace(struct namespace *namespace,
+				  struct vfsmount *mnt)
+{
+	atomic_set(&namespace->count, 1);
+	INIT_LIST_HEAD(&namespace->list);
+	init_waitqueue_head(&namespace->poll);
+	namespace->event = 0;
+	namespace->root = mnt;
+
+	if (mnt) {
+		list_add(&mnt->mnt_list, &namespace->list);
+		mnt->mnt_namespace = namespace;
+	}
+}
+
 static inline void put_namespace(struct namespace *namespace)
 {
 	if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))