ns: Rename "created" futex and comment what it is

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/namespaces.h

@@ -15,7 +15,15 @@ struct ns_id {
 	pid_t pid;
 	struct ns_desc *nd;
 	struct ns_id *next;
-	futex_t created; /* boolean */
+
+	/*
+	 * For mount namespaces on restore -- indicates that
+	 * the namespace in question is created (all mounts
+	 * are mounted) and other tasks may do setns on it
+	 * and proceed.
+	 */
+	futex_t ns_created;
+
 	union {
 		struct {
 			struct mount_info *mntinfo_list;

mount.c

@@ -1650,7 +1650,7 @@ static int rst_collect_local_mntns(void)
 	if (!mntinfo)
 		return -1;
 
-	futex_set(&nsid->created, 1);
+	futex_set(&nsid->ns_created, 1);
 	return 0;
 }
 
@@ -1820,7 +1820,7 @@ static int do_restore_task_mnt_ns(struct ns_id *nsid)
 	if (nsid->pid != getpid()) {
 		int fd;
 
-		futex_wait_while_eq(&nsid->created, 0);
+		futex_wait_while_eq(&nsid->ns_created, 0);
 		fd = open_proc(nsid->pid, "ns/mnt");
 		if (fd < 0)
 			return -1;
@@ -1843,7 +1843,7 @@ static int do_restore_task_mnt_ns(struct ns_id *nsid)
 	if (cr_pivot_root(path))
 		return -1;
 
-	futex_set_and_wake(&nsid->created, 1);
+	futex_set_and_wake(&nsid->ns_created, 1);
 
 	return 0;
 }

namespaces.c

@@ -129,7 +129,7 @@ struct ns_id *rst_new_ns_id(unsigned int id, pid_t pid, struct ns_desc *nd)
 		nsid->nd = nd;
 		nsid->id = id;
 		nsid->pid = pid;
-		futex_set(&nsid->created, 0);
+		futex_set(&nsid->ns_created, 0);
 
 		nsid->next = ns_ids;
 		ns_ids = nsid;