blk-integrity: convert to struct device_attribute

An upcoming patch will register the integrity attributes directly with
the struct device kobject.
For this the attributes have to be implemented in terms of
struct device_attribute.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20230309-kobj_release-gendisk_integrity-v3-2-ceccb4493c46@weissschuh.netSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-integrity.c

@@ -212,21 +212,15 @@ bool blk_integrity_merge_bio(struct request_queue *q, struct request *req,
 	return true;
 }
 
-struct integrity_sysfs_entry {
-	struct attribute attr;
-	ssize_t (*show)(struct blk_integrity *, char *);
-	ssize_t (*store)(struct blk_integrity *, const char *, size_t);
-};
-
 static ssize_t integrity_attr_show(struct kobject *kobj, struct attribute *attr,
 				   char *page)
 {
 	struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
-	struct blk_integrity *bi = &disk->queue->integrity;
-	struct integrity_sysfs_entry *entry =
-		container_of(attr, struct integrity_sysfs_entry, attr);
+	struct device *dev = disk_to_dev(disk);
+	struct device_attribute *dev_attr =
+		container_of(attr, struct device_attribute, attr);
 
-	return entry->show(bi, page);
+	return dev_attr->show(dev, dev_attr, page);
 }
 
 static ssize_t integrity_attr_store(struct kobject *kobj,
@@ -234,38 +228,53 @@ static ssize_t integrity_attr_store(struct kobject *kobj,
 				    size_t count)
 {
 	struct gendisk *disk = container_of(kobj, struct gendisk, integrity_kobj);
-	struct blk_integrity *bi = &disk->queue->integrity;
-	struct integrity_sysfs_entry *entry =
-		container_of(attr, struct integrity_sysfs_entry, attr);
-	ssize_t ret = 0;
+	struct device *dev = disk_to_dev(disk);
+	struct device_attribute *dev_attr =
+		container_of(attr, struct device_attribute, attr);
 
-	if (entry->store)
-		ret = entry->store(bi, page, count);
+	if (!dev_attr->store)
+		return 0;
+	return dev_attr->store(dev, dev_attr, page, count);
+}
 
-	return ret;
+static inline struct blk_integrity *dev_to_bi(struct device *dev)
+{
+	return &dev_to_disk(dev)->queue->integrity;
 }
 
-static ssize_t integrity_format_show(struct blk_integrity *bi, char *page)
+static ssize_t format_show(struct device *dev, struct device_attribute *attr,
+			   char *page)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	if (bi->profile && bi->profile->name)
 		return sysfs_emit(page, "%s\n", bi->profile->name);
 	return sysfs_emit(page, "none\n");
 }
 
-static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page)
+static ssize_t tag_size_show(struct device *dev, struct device_attribute *attr,
+			     char *page)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	return sysfs_emit(page, "%u\n", bi->tag_size);
 }
 
-static ssize_t integrity_interval_show(struct blk_integrity *bi, char *page)
+static ssize_t protection_interval_bytes_show(struct device *dev,
+					      struct device_attribute *attr,
+					      char *page)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	return sysfs_emit(page, "%u\n",
 			  bi->interval_exp ? 1 << bi->interval_exp : 0);
 }
 
-static ssize_t integrity_verify_store(struct blk_integrity *bi,
-				      const char *page, size_t count)
+static ssize_t read_verify_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *page, size_t count)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
 	char *p = (char *) page;
 	unsigned long val = simple_strtoul(p, &p, 10);
 
@@ -277,14 +286,20 @@ static ssize_t integrity_verify_store(struct blk_integrity *bi,
 	return count;
 }
 
-static ssize_t integrity_verify_show(struct blk_integrity *bi, char *page)
+static ssize_t read_verify_show(struct device *dev,
+				struct device_attribute *attr, char *page)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	return sysfs_emit(page, "%d\n", !!(bi->flags & BLK_INTEGRITY_VERIFY));
 }
 
-static ssize_t integrity_generate_store(struct blk_integrity *bi,
-					const char *page, size_t count)
+static ssize_t write_generate_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *page, size_t count)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	char *p = (char *) page;
 	unsigned long val = simple_strtoul(p, &p, 10);
 
@@ -296,57 +311,39 @@ static ssize_t integrity_generate_store(struct blk_integrity *bi,
 	return count;
 }
 
-static ssize_t integrity_generate_show(struct blk_integrity *bi, char *page)
+static ssize_t write_generate_show(struct device *dev,
+				   struct device_attribute *attr, char *page)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	return sysfs_emit(page, "%d\n", !!(bi->flags & BLK_INTEGRITY_GENERATE));
 }
 
-static ssize_t integrity_device_show(struct blk_integrity *bi, char *page)
+static ssize_t device_is_integrity_capable_show(struct device *dev,
+						struct device_attribute *attr,
+						char *page)
 {
+	struct blk_integrity *bi = dev_to_bi(dev);
+
 	return sysfs_emit(page, "%u\n",
 			  !!(bi->flags & BLK_INTEGRITY_DEVICE_CAPABLE));
 }
 
-static struct integrity_sysfs_entry integrity_format_entry = {
-	.attr = { .name = "format", .mode = 0444 },
-	.show = integrity_format_show,
-};
-
-static struct integrity_sysfs_entry integrity_tag_size_entry = {
-	.attr = { .name = "tag_size", .mode = 0444 },
-	.show = integrity_tag_size_show,
-};
-
-static struct integrity_sysfs_entry integrity_interval_entry = {
-	.attr = { .name = "protection_interval_bytes", .mode = 0444 },
-	.show = integrity_interval_show,
-};
-
-static struct integrity_sysfs_entry integrity_verify_entry = {
-	.attr = { .name = "read_verify", .mode = 0644 },
-	.show = integrity_verify_show,
-	.store = integrity_verify_store,
-};
-
-static struct integrity_sysfs_entry integrity_generate_entry = {
-	.attr = { .name = "write_generate", .mode = 0644 },
-	.show = integrity_generate_show,
-	.store = integrity_generate_store,
-};
-
-static struct integrity_sysfs_entry integrity_device_entry = {
-	.attr = { .name = "device_is_integrity_capable", .mode = 0444 },
-	.show = integrity_device_show,
-};
+static DEVICE_ATTR_RO(format);
+static DEVICE_ATTR_RO(tag_size);
+static DEVICE_ATTR_RO(protection_interval_bytes);
+static DEVICE_ATTR_RW(read_verify);
+static DEVICE_ATTR_RW(write_generate);
+static DEVICE_ATTR_RO(device_is_integrity_capable);
 
 static struct attribute *integrity_attrs[] = {
-	&integrity_format_entry.attr,
-	&integrity_tag_size_entry.attr,
-	&integrity_interval_entry.attr,
-	&integrity_verify_entry.attr,
-	&integrity_generate_entry.attr,
-	&integrity_device_entry.attr,
-	NULL,
+	&dev_attr_format.attr,
+	&dev_attr_tag_size.attr,
+	&dev_attr_protection_interval_bytes.attr,
+	&dev_attr_read_verify.attr,
+	&dev_attr_write_generate.attr,
+	&dev_attr_device_is_integrity_capable.attr,
+	NULL
 };
 ATTRIBUTE_GROUPS(integrity);