[PATCH] set mnt_namespace in the correct place

This patch sets ->mnt_namespace where it's actually added to the
namespace.

Previously mnt_namespace was set in do_kern_mount() even if the filesystem
was never added to any process's namespace (most kernel-internal
filesystems).

This discrepancy doesn't actually cause any problems, but it's cleaner if
mnt_namespace is NULL for these non exported filesystems.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/namespace.c

@@ -808,6 +808,7 @@ int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
 		goto unlock;
 
 	newmnt->mnt_flags = mnt_flags;
+	newmnt->mnt_namespace = current->namespace;
 	err = graft_tree(newmnt, nd);
 
 	if (err == 0 && fslist) {

fs/super.c

@@ -840,7 +840,6 @@ do_kern_mount(const char *fstype, int flags, const char *name, void *data)
 	mnt->mnt_root = dget(sb->s_root);
 	mnt->mnt_mountpoint = sb->s_root;
 	mnt->mnt_parent = mnt;
-	mnt->mnt_namespace = current->namespace;
 	up_write(&sb->s_umount);
 	free_secdata(secdata);
 	put_filesystem(type);