[PATCH 03/14] NFS: Abstract out namespace initialisation [try #10]

[David Howells <dhowells@redhat.com>]

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


The following changes were made in [try #8]:

 (*) init_namespace() has been made out-of-line.


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

 fs/namespace.c            |   28 +++++++++++++++++++++-------
 include/linux/namespace.h |    1 +
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 84a3bec..6d2e8fb 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1790,6 +1790,26 @@ out3:
 	goto out2;
 }
 
+/*
+ * initialise a namespace, rooting it at the given specified mountpoint if one
+ * is given
+ */
+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;
+	}
+}
+
+EXPORT_SYMBOL_GPL(init_namespace);
+
 static void __init init_mount_tree(void)
 {
 	struct vfsmount *mnt;
@@ -1802,13 +1822,7 @@ 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..c371a30 100644
--- a/include/linux/namespace.h
+++ b/include/linux/namespace.h
@@ -16,6 +16,7 @@ struct namespace {
 extern int copy_namespace(int, struct task_struct *);
 extern void __put_namespace(struct namespace *namespace);
 extern struct namespace *dup_namespace(struct task_struct *, struct fs_struct *);
+extern void init_namespace(struct namespace *, struct vfsmount *);
 
 static inline void put_namespace(struct namespace *namespace)
 {