cifs: Expand max share name length to 256

The old max share name length limit was 80 due to Windows NET SHARE
command not allowing more than that.  However, share names can be much
longer.  This is a more reasonable maximum share name length.
Signed-off-by: Scott Lovenberg <scott.lovenberg@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

include/uapi/linux/cifs/cifs_mount.h

@@ -20,6 +20,7 @@
 #define CIFS_MAX_DOMAINNAME_LEN 256 /* max fully qualified domain name */
 #define CIFS_MAX_USERNAME_LEN   256 /* reasonable max for current servers */
 #define CIFS_MAX_PASSWORD_LEN   512 /* Windows max seems to be 256 wide chars */
-#define CIFS_MAX_SHARE_LEN       80
+#define CIFS_MAX_SHARE_LEN      256 /* reasonable max share name length */
+
 
 #endif /* _CIFS_MOUNT_H */