md: switch personalities faulty multipath to use md_submodule_head

JIRA: https://issues.redhat.com/browse/RHEL-83988

Upstream status: RHEL-Only

Remove the global list 'pers_list', and switch to use md_submodule_head,
which is managed by xarry. Prepare to unify registration and unregistration
for all sub modules.

Signed-off-by: Nigel Croxon <ncroxon@redhat.com>

Author: ncroxon

drivers/md/md-faulty.c

@@ -55,7 +55,6 @@
 #define MaxFault	50
 #include <linux/blkdev.h>
 #include <linux/module.h>
-#include <linux/raid/md_u.h>
 #include <linux/slab.h>
 #include "md.h"
 #include <linux/seq_file.h>
@@ -350,9 +349,13 @@ static void faulty_free(struct mddev *mddev, void *priv)
 
 static struct md_personality faulty_personality =
 {
-	.name		= "faulty",
-	.level		= LEVEL_FAULTY,
-	.owner		= THIS_MODULE,
+	.head = {
+		.type   = MD_PERSONALITY,
+		.id     = ID_FAULTY,
+		.name   = "faulty",
+		.owner  = THIS_MODULE,
+	},
+
 	.make_request	= faulty_make_request,
 	.run		= faulty_run,
 	.free		= faulty_free,
@@ -363,12 +366,12 @@ static struct md_personality faulty_personality =
 
 static int __init raid_init(void)
 {
-	return register_md_personality(&faulty_personality);
+	return register_md_submodule(&faulty_personality.head);
 }
 
 static void raid_exit(void)
 {
-	unregister_md_personality(&faulty_personality);
+	unregister_md_submodule(&faulty_personality.head);
 }
 
 module_init(raid_init);

drivers/md/md-multipath.c

@@ -13,7 +13,6 @@
 
 #include <linux/blkdev.h>
 #include <linux/module.h>
-#include <linux/raid/md_u.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include "md.h"
@@ -430,9 +429,12 @@ static void multipath_free(struct mddev *mddev, void *priv)
 
 static struct md_personality multipath_personality =
 {
-	.name		= "multipath",
-	.level		= LEVEL_MULTIPATH,
-	.owner		= THIS_MODULE,
+	.head = {
+		.type   = MD_PERSONALITY,
+		.id     = ID_MULTIPATH,
+		.name   = "multipath",
+		.owner  = THIS_MODULE,
+	},
 	.make_request	= multipath_make_request,
 	.run		= multipath_run,
 	.free		= multipath_free,
@@ -445,12 +447,12 @@ static struct md_personality multipath_personality =
 
 static int __init multipath_init (void)
 {
-	return register_md_personality (&multipath_personality);
+	return register_md_submodule(&multipath_personality.head);
 }
 
 static void __exit multipath_exit (void)
 {
-	unregister_md_personality (&multipath_personality);
+	unregister_md_submodule(&multipath_personality.head);
 }
 
 module_init(multipath_init);

drivers/md/md.h

@@ -31,6 +31,8 @@ enum md_submodule_type {
 
 enum md_submodule_id {
 	ID_LINEAR	= LEVEL_LINEAR,
+	ID_FAULTY	= LEVEL_FAULTY,
+	ID_MULTIPATH	= LEVEL_MULTIPATH,
 	ID_RAID0	= 0,
 	ID_RAID1	= 1,
 	ID_RAID4	= 4,