vfs: now it can be done - make mnt_parent point to struct mount

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 13 insertions, 11 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 89248bf1b906..2e9110a37c0e 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -677,36 +677,38 @@ follow_link(struct path *link, struct nameidata *nd, void **p)
 
 static int follow_up_rcu(struct path *path)
 {
-        struct vfsmount *parent;
+        struct mount *mnt = real_mount(path->mnt);
+        struct mount *parent;
         struct dentry *mountpoint;
 
-        parent = real_mount(path->mnt)->mnt_parent;
-        if (parent == path->mnt)
+        parent = mnt->mnt_parent;
+        if (&parent->mnt == path->mnt)
                 return 0;
-        mountpoint = path->mnt->mnt_mountpoint;
+        mountpoint = mnt->mnt.mnt_mountpoint;
         path->dentry = mountpoint;
-        path->mnt = parent;
+        path->mnt = &parent->mnt;
         return 1;
 }
 
 int follow_up(struct path *path)
 {
-        struct vfsmount *parent;
+        struct mount *mnt = real_mount(path->mnt);
+        struct mount *parent;
         struct dentry *mountpoint;
 
         br_read_lock(vfsmount_lock);
-        parent = real_mount(path->mnt)->mnt_parent;
-        if (parent == path->mnt) {
+        parent = mnt->mnt_parent;
+        if (&parent->mnt == path->mnt) {
                 br_read_unlock(vfsmount_lock);
                 return 0;
         }
-        mntget(parent);
-        mountpoint = dget(path->mnt->mnt_mountpoint);
+        mntget(&parent->mnt);
+        mountpoint = dget(mnt->mnt.mnt_mountpoint);
         br_read_unlock(vfsmount_lock);
         dput(path->dentry);
         path->dentry = mountpoint;
         mntput(path->mnt);
-        path->mnt = parent;
+        path->mnt = &parent->mnt;
         return 1;
 }