block: move the partition_meta_info to struct block_device

Move the partition_meta_info to struct block_device in preparation for
killing struct hd_struct.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk.h

@@ -381,7 +381,6 @@ static inline void hd_struct_put(struct hd_struct *part)
 
 static inline void hd_free_part(struct hd_struct *part)
 {
-	kfree(part->info);
 	bdput(part->bdev);
 	percpu_ref_exit(&part->ref);
 }

block/genhd.c

@@ -1010,7 +1010,8 @@ void __init printk_all_partitions(void)
 			       bdevt_str(part_devt(part), devt_buf),
 			       bdev_nr_sectors(part->bdev) >> 1,
 			       disk_name(disk, part->partno, name_buf),
-			       part->info ? part->info->uuid : "");
+			       part->bdev->bd_meta_info ?
+					part->bdev->bd_meta_info->uuid : "");
 			if (is_part0) {
 				if (dev->parent && dev->parent->driver)
 					printk(" driver: %s\n",

block/partitions/core.c

@@ -275,8 +275,9 @@ static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
 	struct hd_struct *part = dev_to_part(dev);
 
 	add_uevent_var(env, "PARTN=%u", part->partno);
-	if (part->info && part->info->volname[0])
-		add_uevent_var(env, "PARTNAME=%s", part->info->volname);
+	if (part->bdev->bd_meta_info && part->bdev->bd_meta_info->volname[0])
+		add_uevent_var(env, "PARTNAME=%s",
+			       part->bdev->bd_meta_info->volname);
 	return 0;
 }
 
@@ -422,13 +423,10 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
 	p->policy = get_disk_ro(disk);
 
 	if (info) {
-		struct partition_meta_info *pinfo;
-
-		pinfo = kzalloc_node(sizeof(*pinfo), GFP_KERNEL, disk->node_id);
-		if (!pinfo)
+		err = -ENOMEM;
+		bdev->bd_meta_info = kmemdup(info, sizeof(*info), GFP_KERNEL);
+		if (!bdev->bd_meta_info)
 			goto out_bdput;
-		memcpy(pinfo, info, sizeof(*info));
-		p->info = pinfo;
 	}
 
 	dname = dev_name(ddev);
@@ -444,7 +442,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
 
 	err = blk_alloc_devt(p, &devt);
 	if (err)
-		goto out_free_info;
+		goto out_bdput;
 	pdev->devt = devt;
 
 	/* delay uevent until 'holders' subdir is created */
@@ -481,8 +479,6 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
 		kobject_uevent(&pdev->kobj, KOBJ_ADD);
 	return p;
 
-out_free_info:
-	kfree(p->info);
 out_bdput:
 	bdput(bdev);
 out_free:

fs/block_dev.c

@@ -785,6 +785,7 @@ static void bdev_free_inode(struct inode *inode)
 	struct block_device *bdev = I_BDEV(inode);
 
 	free_percpu(bdev->bd_stats);
+	kfree(bdev->bd_meta_info);
 
 	kmem_cache_free(bdev_cachep, BDEV_I(inode));
 }

include/linux/blk_types.h

@@ -49,6 +49,8 @@ struct block_device {
 	/* Mutex for freeze */
 	struct mutex		bd_fsfreeze_mutex;
 	struct super_block	*bd_fsfreeze_sb;
+
+	struct partition_meta_info *bd_meta_info;
 } __randomize_layout;
 
 #define bdev_whole(_bdev) \

include/linux/genhd.h

@@ -57,7 +57,6 @@ struct hd_struct {
 	struct device __dev;
 	struct kobject *holder_dir;
 	int policy, partno;
-	struct partition_meta_info *info;
 #ifdef CONFIG_FAIL_MAKE_REQUEST
 	int make_it_fail;
 #endif

init/do_mounts.c

@@ -79,8 +79,8 @@ static int match_dev_by_uuid(struct device *dev, const void *data)
 	const struct uuidcmp *cmp = data;
 	struct hd_struct *part = dev_to_part(dev);
 
-	if (!part->info ||
-	    strncasecmp(cmp->uuid, part->info->uuid, cmp->len))
+	if (!part->bdev->bd_meta_info ||
+	    strncasecmp(cmp->uuid, part->bdev->bd_meta_info->uuid, cmp->len))
 		return 0;
 	return 1;
 }
@@ -169,7 +169,8 @@ static int match_dev_by_label(struct device *dev, const void *data)
 	const char *label = data;
 	struct hd_struct *part = dev_to_part(dev);
 
-	if (!part->info || strcmp(label, part->info->volname))
+	if (!part->bdev->bd_meta_info ||
+	    strcmp(label, part->bdev->bd_meta_info->volname))
 		return 0;
 	return 1;
 }