linux-kernel - [PATCH 02/15] md: introduce sync_folio

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Message-Id: <20251217120013.2616531-3-linan666@huaweicloud.com>
Date: Wed, 17 Dec 2025 20:00:00 +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 02/15] md: introduce sync_folio_io for folio support in RAID

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

Prepare for folio support in RAID by introducing sync_folio_io(),
matching sync_page_io()'s functionality. Differences are:

- Replace input parameter 'page' with 'folio'
- Replace __bio_add_page() calls with bio_add_folio_nofail()
- Add new parameter 'off' to prepare for adding a folio to bio in segments,
  e.g. in fix_recovery_read_error()

sync_page_io() will be removed once full folio support is complete.

Signed-off-by: Li Nan <linan122@...wei.com>
---
 drivers/md/md.h |  2 ++
 drivers/md/md.c | 27 +++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index a083f37374d0..410f8a6b75e7 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -920,6 +920,8 @@ void md_write_metadata(struct mddev *mddev, struct md_rdev *rdev,
 extern int md_super_wait(struct mddev *mddev);
 extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
 		struct page *page, blk_opf_t opf, bool metadata_op);
+extern int sync_folio_io(struct md_rdev *rdev, sector_t sector, int size,
+		int off, struct folio *folio, blk_opf_t opf, bool metadata_op);
 extern void md_do_sync(struct md_thread *thread);
 extern void md_new_event(void);
 extern void md_allow_write(struct mddev *mddev);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index cde84c9f05eb..9dfd6f8da5b8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1192,6 +1192,33 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
 }
 EXPORT_SYMBOL_GPL(sync_page_io);
 
+int sync_folio_io(struct md_rdev *rdev, sector_t sector, int size, int off,
+		  struct folio *folio, blk_opf_t opf, bool metadata_op)
+{
+	struct bio bio;
+	struct bio_vec bvec;
+
+	if (metadata_op && rdev->meta_bdev)
+		bio_init(&bio, rdev->meta_bdev, &bvec, 1, opf);
+	else
+		bio_init(&bio, rdev->bdev, &bvec, 1, opf);
+
+	if (metadata_op)
+		bio.bi_iter.bi_sector = sector + rdev->sb_start;
+	else if (rdev->mddev->reshape_position != MaxSector &&
+		 (rdev->mddev->reshape_backwards ==
+		  (sector >= rdev->mddev->reshape_position)))
+		bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
+	else
+		bio.bi_iter.bi_sector = sector + rdev->data_offset;
+	bio_add_folio_nofail(&bio, folio, size, off);
+
+	submit_bio_wait(&bio);
+
+	return !bio.bi_status;
+}
+EXPORT_SYMBOL_GPL(sync_folio_io);
+
 static int read_disk_sb(struct md_rdev *rdev, int size)
 {
 	if (rdev->sb_loaded)
-- 
2.39.2