block: factor out flag_{store,show} helper for integrity

Factor the duplicate code for the generate and verify attributes into
common helpers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240613084839.1044015-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

block/blk-integrity.c

@@ -243,6 +243,28 @@ const char *blk_integrity_profile_name(struct blk_integrity *bi)
 }
 EXPORT_SYMBOL_GPL(blk_integrity_profile_name);
 
+static ssize_t flag_store(struct device *dev, struct device_attribute *attr,
+		const char *page, size_t count, unsigned char flag)
+{
+	struct blk_integrity *bi = dev_to_bi(dev);
+	char *p = (char *) page;
+	unsigned long val = simple_strtoul(p, &p, 10);
+
+	if (val)
+		bi->flags |= flag;
+	else
+		bi->flags &= ~flag;
+	return count;
+}
+
+static ssize_t flag_show(struct device *dev, struct device_attribute *attr,
+		char *page, unsigned char flag)
+{
+	struct blk_integrity *bi = dev_to_bi(dev);
+
+	return sysfs_emit(page, "%d\n", !!(bi->flags & flag));
+}
+
 static ssize_t format_show(struct device *dev, struct device_attribute *attr,
 			   char *page)
 {
@@ -275,49 +297,26 @@ 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);
-
-	if (val)
-		bi->flags |= BLK_INTEGRITY_VERIFY;
-	else
-		bi->flags &= ~BLK_INTEGRITY_VERIFY;
-
-	return count;
+	return flag_store(dev, attr, page, count, BLK_INTEGRITY_VERIFY);
 }
 
 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));
+	return flag_show(dev, attr, page, BLK_INTEGRITY_VERIFY);
 }
 
 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);
-
-	if (val)
-		bi->flags |= BLK_INTEGRITY_GENERATE;
-	else
-		bi->flags &= ~BLK_INTEGRITY_GENERATE;
-
-	return count;
+	return flag_store(dev, attr, page, count, BLK_INTEGRITY_GENERATE);
 }
 
 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));
+	return flag_show(dev, attr, page, BLK_INTEGRITY_GENERATE);
 }
 
 static ssize_t device_is_integrity_capable_show(struct device *dev,