[PATCH v3 2/8] md: introduce sync_folio_io for folio support in RAID

[linan666]

From: Li Nan <linan122@xxxxxxxxxx>

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

- Add new parameter 'off' to prepare for adding a folio to bio in segments,
  e.g. in fix_recovery_read_error()
- Change return value to bool
- Replace the checking to 'bio.bi_status == BLK_STS_OK'

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

Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
---
 drivers/md/md.h |  4 +++-
 drivers/md/md.c | 15 +++++++++++----
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index ac84289664cd..914b992a073b 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -924,8 +924,10 @@ void md_write_metadata(struct mddev *mddev, struct md_rdev *rdev,
 		       sector_t sector, int size, struct page *page,
 		       unsigned int offset);
 extern int md_super_wait(struct mddev *mddev);
-extern int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
+extern bool sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
 		struct page *page, blk_opf_t opf, bool metadata_op);
+extern bool 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 d9c9fd2839b3..5e83914d5c14 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1166,8 +1166,8 @@ int md_super_wait(struct mddev *mddev)
 	return 0;
 }
 
-int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
-		 struct page *page, blk_opf_t opf, bool metadata_op)
+bool 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;
@@ -1185,11 +1185,18 @@ int sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
 		bio.bi_iter.bi_sector = sector + rdev->new_data_offset;
 	else
 		bio.bi_iter.bi_sector = sector + rdev->data_offset;
-	__bio_add_page(&bio, page, size, 0);
+	bio_add_folio_nofail(&bio, folio, size, off);
 
 	submit_bio_wait(&bio);
 
-	return !bio.bi_status;
+	return bio.bi_status == BLK_STS_OK;
+}
+EXPORT_SYMBOL_GPL(sync_folio_io);
+
+bool sync_page_io(struct md_rdev *rdev, sector_t sector, int size,
+		 struct page *page, blk_opf_t opf, bool metadata_op)
+{
+	return sync_folio_io(rdev, sector, size, 0, page_folio(page), opf, metadata_op);
 }
 EXPORT_SYMBOL_GPL(sync_page_io);
 
-- 
2.39.2