linux-kernel - [PATCH RFC -next v2 08/41] md/md-cluster: use helper md_bitmap_get_stats() to get pages in resize

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Message-Id: <20240814071113.346781-9-yukuai1@huaweicloud.com>
Date: Wed, 14 Aug 2024 15:10:40 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: mariusz.tkaczyk@...ux.intel.com,
	hch@...radead.org,
	song@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH RFC -next v2 08/41] md/md-cluster: use helper md_bitmap_get_stats() to get pages in resize_bitmaps()

From: Yu Kuai <yukuai3@...wei.com>

Use the existed helper instead of open coding it, avoid dereferencing
bitmap directly to prepare inventing a new bitmap.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/md-cluster.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 9d87c215f094..e4ad8efdc63b 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1144,12 +1144,18 @@ static int update_bitmap_size(struct mddev *mddev, sector_t size)
 static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize)
 {
 	struct bitmap_counts *counts;
-	char str[64];
 	struct dlm_lock_resource *bm_lockres;
 	struct bitmap *bitmap = mddev->bitmap;
-	unsigned long my_pages = bitmap->counts.pages;
+	struct md_bitmap_stats stats;
+	unsigned long my_pages;
+	char str[64];
 	int i, rv;
 
+	rv = md_bitmap_get_stats(bitmap, &stats);
+	if (rv)
+		return rv;
+
+	my_pages = stats.pages;
 	/*
 	 * We need to ensure all the nodes can grow to a larger
 	 * bitmap size before make the reshaping.
@@ -1170,6 +1176,9 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 		}
 		counts = &bitmap->counts;
 
+		rv = md_bitmap_get_stats(bitmap, &stats);
+		if (rv)
+			goto out;
 		/*
 		 * If we can hold the bitmap lock of one node then
 		 * the slot is not occupied, update the pages.
@@ -1186,7 +1195,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
 			counts->pages = my_pages;
 		lockres_free(bm_lockres);
 
-		if (my_pages != counts->pages)
+		if (my_pages != stats.pages)
 			/*
 			 * Let's revert the bitmap size if one node
 			 * can't resize bitmap
-- 
2.39.2