1 files changed, 7 insertions, 30 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index 89509b5a090e..9791b1e7eee4 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -38,6 +38,7 @@
 #include <linux/prefetch.h>
 #include <linux/ratelimit.h>
 #include "internal.h"
+#include "mount.h"
 
 /*
  * Usage:
@@ -2451,6 +2452,7 @@ static int prepend_path(const struct path *path,
 {
         struct dentry *dentry = path->dentry;
         struct vfsmount *vfsmnt = path->mnt;
+        struct mount *mnt = real_mount(vfsmnt);
         bool slash = false;
         int error = 0;
 
@@ -2460,11 +2462,11 @@ static int prepend_path(const struct path *path,
 
                 if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
                         /* Global root? */
-                        if (vfsmnt->mnt_parent == vfsmnt) {
+                        if (!mnt_has_parent(mnt))
                                 goto global_root;
-                        }
-                        dentry = vfsmnt->mnt_mountpoint;
-                        vfsmnt = vfsmnt->mnt_parent;
+                        dentry = mnt->mnt_mountpoint;
+                        mnt = mnt->mnt_parent;
+                        vfsmnt = &mnt->mnt;
                         continue;
                 }
                 parent = dentry->d_parent;
@@ -2501,7 +2503,7 @@ global_root:
         if (!slash)
                 error = prepend(buffer, buflen, "/", 1);
         if (!error)
-                error = vfsmnt->mnt_ns ? 1 : 2;
+                error = real_mount(vfsmnt)->mnt_ns ? 1 : 2;
         goto out;
 }
 
@@ -2853,31 +2855,6 @@ int is_subdir(struct dentry *new_dentry, struct dentry *old_dentry)
         return result;
 }
 
-int path_is_under(struct path *path1, struct path *path2)
-{
-        struct vfsmount *mnt = path1->mnt;
-        struct dentry *dentry = path1->dentry;
-        int res;
-
-        br_read_lock(vfsmount_lock);
-        if (mnt != path2->mnt) {
-                for (;;) {
-                        if (mnt->mnt_parent == mnt) {
-                                br_read_unlock(vfsmount_lock);
-                                return 0;
-                        }
-                        if (mnt->mnt_parent == path2->mnt)
-                                break;
-                        mnt = mnt->mnt_parent;
-                }
-                dentry = mnt->mnt_mountpoint;
-        }
-        res = is_subdir(dentry, path2->dentry);
-        br_read_unlock(vfsmount_lock);
-        return res;
-}
-EXPORT_SYMBOL(path_is_under);
-
 void d_genocide(struct dentry *root)
 {
         struct dentry *this_parent;