Wait for name to appear after create/assemble etc.

We don't really want mdadm to exit until udev has
created the names in /dev.  So wait.

Signed-off-by: NeilBrown <neilb@suse.de>

Assemble.c

@@ -1216,6 +1216,10 @@ int assemble_container_content(struct supertype *st, int mdfd,
 		/* Nothing new, don't try to start */ ;
 	else if (runstop > 0 ||
 		 (working + preexist) >= content->array.working_disks) {
+
+		map_update(&map, fd2devnum(mdfd),
+			   content->text_version,
+			   content->uuid, chosen_name);
 		switch(content->array.level) {
 		case LEVEL_LINEAR:
 		case LEVEL_MULTIPATH:
@@ -1241,6 +1245,7 @@ int assemble_container_content(struct supertype *st, int mdfd,
 				fprintf(stderr, " (%d new)", working);
 			fprintf(stderr, "\n");
 		}
+		wait_for(chosen_name);
 		/* FIXME should have an O_EXCL and wait for read-auto */
 	} else
 		if (verbose >= 0)
@@ -1248,9 +1253,6 @@ int assemble_container_content(struct supertype *st, int mdfd,
 				": %s assembled with %d devices but "
 				"not started\n",
 				chosen_name, working);
-	map_update(&map, fd2devnum(mdfd),
-		   content->text_version,
-		   content->uuid, chosen_name);
 
 	return 0;
 }

Build.c

@@ -124,6 +124,7 @@ int Build(char *mddev, int chunk, int level, int layout,
 		map_unlock(&map);
 		return 1;
 	}
+	mddev = chosen_name;
 
 	map_update(&map, fd2devnum(mdfd), "none", uuid, chosen_name);
 	map_unlock(&map);
@@ -281,6 +282,7 @@ int Build(char *mddev, int chunk, int level, int layout,
 		fprintf(stderr, Name ": array %s built and started.\n",
 			mddev);
 	close(mdfd);
+	wait_for(mddev);
 	return 0;
 
  abort:

Create.c

@@ -784,6 +784,7 @@ int Create(struct supertype *st, char *mddev,
 		fprintf(stderr, Name ": not starting array - not enough devices.\n");
 	}
 	close(mdfd);
+	wait_for(chosen_name);
 	return 0;
 
  abort:

Incremental.c

@@ -390,6 +390,7 @@ int Incremental(char *devname, int verbose, int runstop,
 			fprintf(stderr, Name
 				": container %s now has %d devices\n",
 				chosen_name, info.array.working_disks);
+		wait_for(chosen_name);
 		return Incremental(chosen_name, verbose, runstop,
 				   NULL, homehost, autof);
 	}
@@ -461,6 +462,7 @@ int Incremental(char *devname, int verbose, int runstop,
 			   ": %s attached to %s, which has been started.\n",
 					devname, chosen_name);
 			rv = 0;
+			wait_for(chosen_name);
 		} else {
 			fprintf(stderr, Name
                              ": %s attached to %s, but failed to start: %s.\n",

mdadm.h

@@ -646,6 +646,7 @@ extern struct supertype *dup_super(struct supertype *st);
 extern int get_dev_size(int fd, char *dname, unsigned long long *sizep);
 extern void get_one_disk(int mdfd, mdu_array_info_t *ainf,
 			 mdu_disk_info_t *disk);
+void wait_for(char *dev);
 
 #if __GNUC__ < 3
 struct stat64;

util.c

@@ -842,6 +842,18 @@ int same_dev(char *one, char *two)
 	return st1.st_rdev == st2.st_rdev;
 }
 
+void wait_for(char *dev)
+{
+	int i;
+
+	for (i=0 ; i<25 ; i++) {
+		struct stat stb;
+		if (stat(dev, &stb) == 0)
+			return;
+		usleep(200000);
+	}
+}
+
 struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
 
 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)