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

[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>
---
warthog>diffstat -p1 init-namespace-2616rc4.diff
 fs/namespace.c            |    8 +-------
 include/linux/namespace.h |   15 +++++++++++++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff -uNrp linux-2.6.16-rc4-getsb/include/linux/namespace.h linux-2.6.16-rc4-getsb-nfs/include/linux/namespace.h
--- linux-2.6.16-rc4-getsb/include/linux/namespace.h	2006-02-22 17:00:42.000000000 +0000
+++ linux-2.6.16-rc4-getsb-nfs/include/linux/namespace.h	2006-02-22 17:37:04.000000000 +0000
@@ -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))
diff -uNrp linux-2.6.16-rc4-getsb/fs/namespace.c linux-2.6.16-rc4-getsb-nfs/fs/namespace.c
--- linux-2.6.16-rc4-getsb/fs/namespace.c	2006-02-22 17:00:37.000000000 +0000
+++ linux-2.6.16-rc4-getsb-nfs/fs/namespace.c	2006-02-22 18:21:52.000000000 +0000
@@ -1679,13 +1679,7 @@ 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);
-
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