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@xxxxxxxxxx>
---
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)
{
-
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