mnt: Factor out unhash_mnt from detach_mnt and umount_tree

Create a function unhash_mnt that contains the common code between
detach_mnt and umount_tree, and use unhash_mnt in place of the common
code.  This add a unncessary list_del_init(mnt->mnt_child) into
umount_tree but given that mnt_child is already empty this extra
line is a noop.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

1 files changed, 12 insertions, 9 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index acc5583764dc..e669a3bf86e7 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -798,10 +798,8 @@ static void __touch_mnt_namespace(struct mnt_namespace *ns)
 /*
  * vfsmount lock must be held for write
  */
-static void detach_mnt(struct mount *mnt, struct path *old_path)
+static void unhash_mnt(struct mount *mnt)
 {
-        old_path->dentry = mnt->mnt_mountpoint;
-        old_path->mnt = &mnt->mnt_parent->mnt;
         mnt->mnt_parent = mnt;
         mnt->mnt_mountpoint = mnt->mnt.mnt_root;
         list_del_init(&mnt->mnt_child);
@@ -814,6 +812,16 @@ static void detach_mnt(struct mount *mnt, struct path *old_path)
 /*
  * vfsmount lock must be held for write
  */
+static void detach_mnt(struct mount *mnt, struct path *old_path)
+{
+        old_path->dentry = mnt->mnt_mountpoint;
+        old_path->mnt = &mnt->mnt_parent->mnt;
+        unhash_mnt(mnt);
+}
+
+/*
+ * vfsmount lock must be held for write
+ */
 void mnt_set_mountpoint(struct mount *mnt,
                         struct mountpoint *mp,
                         struct mount *child_mnt)
@@ -1362,15 +1370,10 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how)
 
                 pin_insert_group(&p->mnt_umount, &p->mnt_parent->mnt, &unmounted);
                 if (mnt_has_parent(p)) {
-                        hlist_del_init(&p->mnt_mp_list);
-                        put_mountpoint(p->mnt_mp);
                         mnt_add_count(p->mnt_parent, -1);
                         /* old mountpoint will be dropped when we can do that */
                         p->mnt_ex_mountpoint = p->mnt_mountpoint;
-                        p->mnt_mountpoint = p->mnt.mnt_root;
-                        p->mnt_parent = p;
-                        p->mnt_mp = NULL;
-                        hlist_del_init_rcu(&p->mnt_hash);
+                        unhash_mnt(p);
                 }
                 change_mnt_propagation(p, MS_PRIVATE);
         }