md/md-bitmap: cleanup bitmap_ops->startwrite()

bitmap_startwrite() always return 0, and the caller doesn't check return
value as well, hence change the method to void.

Also rename startwrite/endwrite to start_write/end_write, which is more in
line with the usual naming convention.

Link: https://lore.kernel.org/linux-raid/20250524061320.370630-4-yukuai1@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Xiao Ni <xni@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>

Author: YuKuai-huawei

drivers/md/md-bitmap.c

@@ -1682,13 +1682,13 @@ __acquires(bitmap->lock)
 			&(bitmap->bp[page].map[pageoff]);
 }
 
-static int bitmap_startwrite(struct mddev *mddev, sector_t offset,
-			     unsigned long sectors)
+static void bitmap_start_write(struct mddev *mddev, sector_t offset,
+			       unsigned long sectors)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 
 	if (!bitmap)
-		return 0;
+		return;
 
 	while (sectors) {
 		sector_t blocks;
@@ -1698,7 +1698,7 @@ static int bitmap_startwrite(struct mddev *mddev, sector_t offset,
 		bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 1);
 		if (!bmc) {
 			spin_unlock_irq(&bitmap->counts.lock);
-			return 0;
+			return;
 		}
 
 		if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) {
@@ -1734,11 +1734,10 @@ static int bitmap_startwrite(struct mddev *mddev, sector_t offset,
 		else
 			sectors = 0;
 	}
-	return 0;
 }
 
-static void bitmap_endwrite(struct mddev *mddev, sector_t offset,
-			    unsigned long sectors)
+static void bitmap_end_write(struct mddev *mddev, sector_t offset,
+			     unsigned long sectors)
 {
 	struct bitmap *bitmap = mddev->bitmap;
 
@@ -3013,8 +3012,8 @@ static struct bitmap_operations bitmap_ops = {
 	.end_behind_write	= bitmap_end_behind_write,
 	.wait_behind_writes	= bitmap_wait_behind_writes,
 
-	.startwrite		= bitmap_startwrite,
-	.endwrite		= bitmap_endwrite,
+	.start_write		= bitmap_start_write,
+	.end_write		= bitmap_end_write,
 	.start_sync		= bitmap_start_sync,
 	.end_sync		= bitmap_end_sync,
 	.cond_end_sync		= bitmap_cond_end_sync,

drivers/md/md-bitmap.h

@@ -80,10 +80,10 @@ struct bitmap_operations {
 	void (*end_behind_write)(struct mddev *mddev);
 	void (*wait_behind_writes)(struct mddev *mddev);
 
-	int (*startwrite)(struct mddev *mddev, sector_t offset,
+	void (*start_write)(struct mddev *mddev, sector_t offset,
+			    unsigned long sectors);
+	void (*end_write)(struct mddev *mddev, sector_t offset,
 			  unsigned long sectors);
-	void (*endwrite)(struct mddev *mddev, sector_t offset,
-			 unsigned long sectors);
 	bool (*start_sync)(struct mddev *mddev, sector_t offset,
 			   sector_t *blocks, bool degraded);
 	void (*end_sync)(struct mddev *mddev, sector_t offset, sector_t *blocks);

drivers/md/md.c

@@ -8799,14 +8799,14 @@ static void md_bitmap_start(struct mddev *mddev,
 		mddev->pers->bitmap_sector(mddev, &md_io_clone->offset,
 					   &md_io_clone->sectors);
 
-	mddev->bitmap_ops->startwrite(mddev, md_io_clone->offset,
-				      md_io_clone->sectors);
+	mddev->bitmap_ops->start_write(mddev, md_io_clone->offset,
+				       md_io_clone->sectors);
 }
 
 static void md_bitmap_end(struct mddev *mddev, struct md_io_clone *md_io_clone)
 {
-	mddev->bitmap_ops->endwrite(mddev, md_io_clone->offset,
-				    md_io_clone->sectors);
+	mddev->bitmap_ops->end_write(mddev, md_io_clone->offset,
+				     md_io_clone->sectors);
 }
 
 static void md_end_clone_io(struct bio *bio)