md/md-bitmap: merge md_bitmap_dirty_bits() into bitmap_operations

So that the implementation won't be exposed, and it'll be possible
to invent a new bitmap by replacing bitmap_operations.

Also change the parameter from bitmap to mddev, to avoid access
bitmap outside md-bitmap.c as much as possible.

And while we're here, also fix coding style for bitmap_store().
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240826074452.1490072-23-yukuai1@huaweicloud.comSigned-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -1753,12 +1753,18 @@ static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, in
 }
 
 /* dirty the memory and file bits for bitmap chunks "s" to "e" */
-void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
+static void bitmap_dirty_bits(struct mddev *mddev, unsigned long s,
+			      unsigned long e)
 {
 	unsigned long chunk;
+	struct bitmap *bitmap = mddev->bitmap;
+
+	if (!bitmap)
+		return;
 
 	for (chunk = s; chunk <= e; chunk++) {
 		sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift;
+
 		md_bitmap_set_memory_bits(bitmap, sec, 1);
 		md_bitmap_file_set_bit(bitmap, sec);
 		if (sec < bitmap->mddev->recovery_cp)
@@ -2720,6 +2726,7 @@ static struct bitmap_operations bitmap_ops = {
 	.destroy		= bitmap_destroy,
 	.flush			= bitmap_flush,
 	.write_all		= bitmap_write_all,
+	.dirty_bits		= bitmap_dirty_bits,
 
 	.update_sb		= bitmap_update_sb,
 	.get_stats		= bitmap_get_stats,

drivers/md/md-bitmap.h

@@ -252,6 +252,8 @@ struct bitmap_operations {
 	void (*destroy)(struct mddev *mddev);
 	void (*flush)(struct mddev *mddev);
 	void (*write_all)(struct mddev *mddev);
+	void (*dirty_bits)(struct mddev *mddev, unsigned long s,
+			   unsigned long e);
 
 	void (*update_sb)(struct bitmap *bitmap);
 	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
@@ -260,10 +262,6 @@ struct bitmap_operations {
 /* the bitmap API */
 void mddev_set_bitmap_ops(struct mddev *mddev);
 
-/* these are used only by md/bitmap */
-
-void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e);
-
 /* these are exported */
 int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset,
 			 unsigned long sectors, int behind);

drivers/md/md.c

@@ -4699,14 +4699,20 @@ bitmap_store(struct mddev *mddev, const char *buf, size_t len)
 	/* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
 	while (*buf) {
 		chunk = end_chunk = simple_strtoul(buf, &end, 0);
-		if (buf == end) break;
+		if (buf == end)
+			break;
+
 		if (*end == '-') { /* range */
 			buf = end + 1;
 			end_chunk = simple_strtoul(buf, &end, 0);
-			if (buf == end) break;
+			if (buf == end)
+				break;
 		}
-		if (*end && !isspace(*end)) break;
-		md_bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
+
+		if (*end && !isspace(*end))
+			break;
+
+		mddev->bitmap_ops->dirty_bits(mddev, chunk, end_chunk);
 		buf = skip_spaces(end);
 	}
 	md_bitmap_unplug(mddev->bitmap); /* flush the bits to disk */