eventfd: Add checkpoint/restore support v2

v2:
 - Pass initial counter value to eventfd call
   (can't pass flags here since they are obtained
    with fcntl and must be restored same way or
    restore will fail)
 - Use rst_file_params for flags and owner restore
 - Use eventfd.[ch] instead of eventfs.[ch]
 - Move show funcs to eventfd.c

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

crtools.c

@@ -24,6 +24,7 @@
 #include "ipc_ns.h"
 #include "files.h"
 #include "sk-inet.h"
+#include "eventfd.h"
 
 struct cr_options opts;
 
@@ -63,6 +64,13 @@ struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX] = {
 		.show	= show_reg_files,
 	},
 
+	/* eventfd */
+	[CR_FD_EVENTFD] = {
+		.fmt	= FMT_FNAME_EVENTFD,
+		.magic	= EVENTFD_MAGIC,
+		.show	= show_eventfds,
+	},
+
 	/* core data, such as regs and vmas and such */
 	[CR_FD_CORE] = {
 		.fmt	= FMT_FNAME_CORE,