linux-kernel - [PATCH 03/15] md: use folio for bb

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Message-Id: <20251217120013.2616531-4-linan666@huaweicloud.com>
Date: Wed, 17 Dec 2025 20:00:01 +0800
From: linan666@...weicloud.com
To: song@...nel.org,
	yukuai@...as.com
Cc: linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	xni@...hat.com,
	linan666@...weicloud.com,
	yangerkun@...wei.com,
	yi.zhang@...wei.com
Subject: [PATCH 03/15] md: use folio for bb_folio

From: Li Nan <linan122@...wei.com>

Convert bio_page to bio_folio and use it throughout.

Signed-off-by: Li Nan <linan122@...wei.com>
---
 drivers/md/md.h |  3 ++-
 drivers/md/md.c | 25 +++++++++++++------------
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index 410f8a6b75e7..aa6d9df50fd0 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -144,7 +144,8 @@ struct md_rdev {
 	struct block_device *bdev;	/* block device handle */
 	struct file *bdev_file;		/* Handle from open for bdev */
 
-	struct page	*sb_page, *bb_page;
+	struct page	*sb_page;
+	struct folio	*bb_folio;
 	int		sb_loaded;
 	__u64		sb_events;
 	sector_t	data_offset;	/* start of data in array */
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9dfd6f8da5b8..0732bbcdb95d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1073,9 +1073,9 @@ void md_rdev_clear(struct md_rdev *rdev)
 		rdev->sb_start = 0;
 		rdev->sectors = 0;
 	}
-	if (rdev->bb_page) {
-		put_page(rdev->bb_page);
-		rdev->bb_page = NULL;
+	if (rdev->bb_folio) {
+		folio_put(rdev->bb_folio);
+		rdev->bb_folio = NULL;
 	}
 	badblocks_exit(&rdev->badblocks);
 }
@@ -1909,9 +1909,10 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
 
 	rdev->desc_nr = le32_to_cpu(sb->dev_number);
 
-	if (!rdev->bb_page) {
-		rdev->bb_page = alloc_page(GFP_KERNEL);
-		if (!rdev->bb_page)
+	if (!rdev->bb_folio) {
+		rdev->bb_folio = folio_alloc(GFP_KERNEL, 0);
+
+		if (!rdev->bb_folio)
 			return -ENOMEM;
 	}
 	if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) &&
@@ -1930,10 +1931,10 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_
 		if (offset == 0)
 			return -EINVAL;
 		bb_sector = (long long)offset;
-		if (!sync_page_io(rdev, bb_sector, sectors << 9,
-				  rdev->bb_page, REQ_OP_READ, true))
+		if (!sync_folio_io(rdev, bb_sector, sectors << 9, 0,
+				  rdev->bb_folio, REQ_OP_READ, true))
 			return -EIO;
-		bbp = (__le64 *)page_address(rdev->bb_page);
+		bbp = (__le64 *)folio_address(rdev->bb_folio);
 		rdev->badblocks.shift = sb->bblog_shift;
 		for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) {
 			u64 bb = le64_to_cpu(*bbp);
@@ -2300,7 +2301,7 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev)
 		md_error(mddev, rdev);
 	else {
 		struct badblocks *bb = &rdev->badblocks;
-		__le64 *bbp = (__le64 *)page_address(rdev->bb_page);
+		__le64 *bbp = (__le64 *)folio_address(rdev->bb_folio);
 		u64 *p = bb->page;
 		sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS);
 		if (bb->changed) {
@@ -2953,7 +2954,7 @@ void md_update_sb(struct mddev *mddev, int force_change)
 				md_write_metadata(mddev, rdev,
 						  rdev->badblocks.sector,
 						  rdev->badblocks.size << 9,
-						  rdev->bb_page, 0);
+						  folio_page(rdev->bb_folio, 0), 0);
 				rdev->badblocks.size = 0;
 			}
 
@@ -3809,7 +3810,7 @@ int md_rdev_init(struct md_rdev *rdev)
 	rdev->sb_events = 0;
 	rdev->last_read_error = 0;
 	rdev->sb_loaded = 0;
-	rdev->bb_page = NULL;
+	rdev->bb_folio = NULL;
 	atomic_set(&rdev->nr_pending, 0);
 	atomic_set(&rdev->read_errors, 0);
 	atomic_set(&rdev->corrected_errors, 0);
-- 
2.39.2