1 files changed, 15 insertions, 9 deletions

diff --git a/fs/namei.c b/fs/namei.c
index f8c69d373793..445fd5da11fa 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -716,19 +716,25 @@ static int follow_automount(struct path *path, unsigned flags,
         if ((flags & LOOKUP_NO_AUTOMOUNT) && !(flags & LOOKUP_PARENT))
                 return -EISDIR; /* we actually want to stop here */
 
-        /* We want to mount if someone is trying to open/create a file of any
-         * type under the mountpoint, wants to traverse through the mountpoint
-         * or wants to open the mounted directory.
-         *
+        /*
          * We don't want to mount if someone's just doing a stat and they've
          * set AT_SYMLINK_NOFOLLOW - unless they're stat'ing a directory and
          * appended a '/' to the name.
          */
-        if (!(flags & LOOKUP_FOLLOW) &&
-            !(flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY |
-                       LOOKUP_OPEN | LOOKUP_CREATE)))
-                return -EISDIR;
-
+        if (!(flags & LOOKUP_FOLLOW)) {
+                /* We do, however, want to mount if someone wants to open or
+                 * create a file of any type under the mountpoint, wants to
+                 * traverse through the mountpoint or wants to open the mounted
+                 * directory.
+                 * Also, autofs may mark negative dentries as being automount
+                 * points.  These will need the attentions of the daemon to
+                 * instantiate them before they can be used.
+                 */
+                if (!(flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY |
+                             LOOKUP_OPEN | LOOKUP_CREATE)) &&
+                    path->dentry->d_inode)
+                        return -EISDIR;
+        }
         current->total_link_count++;
         if (current->total_link_count >= 40)
                 return -ELOOP;