cifs: disable serverino if server doesn't support it

A recent regression when dealing with older servers. This bug was
introduced when we made serverino the default...

When the server can't provide inode numbers, disable it for the mount.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 18afe57b2461..b6a47b32f21e 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -513,9 +513,12 @@ int cifs_get_inode_info(struct inode **pinode,
                                         cifs_sb->mnt_cifs_flags &
                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
                         if (rc1) {
-                                /* BB EOPNOSUPP disable SERVER_INUM? */
                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
                                 fattr.cf_uniqueid = iunique(sb, ROOT_I);
+                                /* disable serverino if call not supported */
+                                if (rc1 == -EINVAL)
+                                        cifs_sb->mnt_cifs_flags &=
+                                                        ~CIFS_MOUNT_SERVER_INUM;
                         }
                 } else {
                         fattr.cf_uniqueid = iunique(sb, ROOT_I);