CIFS: fix automount for DFS shares

Automounting directories are now invalidated by .d_revalidate()
so to be d_instantiate()d again with the right DCACHE_NEED_AUTOMOUNT
flag

Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 0c8098d54d2b..d7eeb9d3ed6f 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -648,8 +648,16 @@ cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
         if (direntry->d_inode) {
                 if (cifs_revalidate_dentry(direntry))
                         return 0;
-                else
+                else {
+                        /*
+                         * Forcibly invalidate automounting directory inodes
+                         * (remote DFS directories) so to have them
+                         * instantiated again for automount
+                         */
+                        if (IS_AUTOMOUNT(direntry->d_inode))
+                                return 0;
                         return 1;
+                }
         }
 
         /*