md/md-bitmap: merge md_bitmap_status() 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.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20240826074452.1490072-20-yukuai1@huaweicloud.com
Signed-off-by: Song Liu <song@kernel.org>

drivers/md/md-bitmap.c

@@ -2105,7 +2105,7 @@ void md_bitmap_set_pages(struct bitmap *bitmap, unsigned long pages)
 }
 EXPORT_SYMBOL_GPL(md_bitmap_set_pages);
 
-int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
+static int bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 {
 	struct bitmap_storage *storage;
 	struct bitmap_counts *counts;
@@ -2131,7 +2131,6 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 	stats->events_cleared = bitmap->events_cleared;
 	return 0;
 }
-EXPORT_SYMBOL_GPL(md_bitmap_get_stats);
 
 int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks,
 		  int chunksize, int init)
@@ -2723,6 +2722,7 @@ static struct bitmap_operations bitmap_ops = {
 	.flush			= bitmap_flush,
 
 	.update_sb		= bitmap_update_sb,
+	.get_stats		= bitmap_get_stats,
 };
 
 void mddev_set_bitmap_ops(struct mddev *mddev)

drivers/md/md-bitmap.h

@@ -253,6 +253,7 @@ struct bitmap_operations {
 	void (*flush)(struct mddev *mddev);
 
 	void (*update_sb)(struct bitmap *bitmap);
+	int (*get_stats)(struct bitmap *bitmap, struct md_bitmap_stats *stats);
 };
 
 /* the bitmap API */
@@ -260,8 +261,6 @@ void mddev_set_bitmap_ops(struct mddev *mddev);
 
 /* these are used only by md/bitmap */
 
-int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats);
-
 int  md_bitmap_setallbits(struct bitmap *bitmap);
 void md_bitmap_write_all(struct bitmap *bitmap);
 

drivers/md/md-cluster.c

@@ -1148,7 +1148,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 	unsigned long my_pages;
 	int i, rv;
 
-	rv = md_bitmap_get_stats(bitmap, &stats);
+	rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 	if (rv)
 		return rv;
 
@@ -1175,7 +1175,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			goto out;
 		}
 
-		rv = md_bitmap_get_stats(bitmap, &stats);
+		rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 		if (rv)
 			goto out;
 		/*
@@ -1225,7 +1225,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 	char str[64];
 	int i, rv;
 
-	rv = md_bitmap_get_stats(bitmap, &stats);
+	rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 	if (rv)
 		return rv;
 
@@ -1258,7 +1258,7 @@ static int cluster_check_sync_size(struct mddev *mddev)
 			mddev->bitmap_ops->update_sb(bitmap);
 		lockres_free(bm_lockres);
 
-		rv = md_bitmap_get_stats(bitmap, &stats);
+		rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
 		if (rv) {
 			md_bitmap_free(bitmap);
 			return rv;

drivers/md/md.c

@@ -1378,7 +1378,7 @@ static u64 md_bitmap_events_cleared(struct mddev *mddev)
 	struct md_bitmap_stats stats;
 	int err;
 
-	err = md_bitmap_get_stats(mddev->bitmap, &stats);
+	err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 	if (err)
 		return 0;
 
@@ -2354,11 +2354,12 @@ super_1_allow_new_offset(struct md_rdev *rdev,
 		return 0;
 
 	if (!rdev->mddev->bitmap_info.file) {
+		struct mddev *mddev = rdev->mddev;
 		struct md_bitmap_stats stats;
 		int err;
 
-		err = md_bitmap_get_stats(rdev->mddev->bitmap, &stats);
-		if (!err && rdev->sb_start + rdev->mddev->bitmap_info.offset +
+		err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
+		if (!err && rdev->sb_start + mddev->bitmap_info.offset +
 		    stats.file_pages * (PAGE_SIZE >> 9) > new_offset)
 			return 0;
 	}
@@ -7588,7 +7589,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 		} else {
 			struct md_bitmap_stats stats;
 
-			rv = md_bitmap_get_stats(mddev->bitmap, &stats);
+			rv = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 			if (rv)
 				goto err;
 
@@ -8388,7 +8389,7 @@ static void md_bitmap_status(struct seq_file *seq, struct mddev *mddev)
 	unsigned long chunk_kb;
 	int err;
 
-	err = md_bitmap_get_stats(mddev->bitmap, &stats);
+	err = mddev->bitmap_ops->get_stats(mddev->bitmap, &stats);
 	if (err)
 		return;
 

drivers/md/raid1.c

@@ -1599,7 +1599,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 			 * Not if there are too many, or cannot
 			 * allocate memory, or a reader on WriteMostly
 			 * is waiting for behind writes to flush */
-			err = md_bitmap_get_stats(bitmap, &stats);
+			err = mddev->bitmap_ops->get_stats(bitmap, &stats);
 			if (!err && write_behind && !stats.behind_wait &&
 			    stats.behind_writes < max_write_behind)
 				alloc_behind_master_bio(r1_bio, bio);