[RFC v2 4/5] mpage: use folios in bio end_io handler

[Pankaj Raghav <p.raghav@xxxxxxxxxxx>]

Use folios in the bio end_io handler. This conversion does the appropriate
handling on the folios in the respective end_io callback and removes the
call to page_endio(), which is soon to be removed.

Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
---
 fs/mpage.c | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/fs/mpage.c b/fs/mpage.c
index 3a545bf0f184..103505551896 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -45,13 +45,15 @@
  */
 static void mpage_read_end_io(struct bio *bio)
 {
-	struct bio_vec *bv;
-	struct bvec_iter_all iter_all;
+	struct folio_iter fi;
+	int err = blk_status_to_errno(bio->bi_status);
 
-	bio_for_each_segment_all(bv, bio, iter_all) {
-		struct page *page = bv->bv_page;
-		page_endio(page, REQ_OP_READ,
-			   blk_status_to_errno(bio->bi_status));
+	bio_for_each_folio_all(fi, bio) {
+		struct folio *folio = fi.folio;
+
+		if (!err)
+			folio_mark_uptodate(folio);
+		folio_unlock(folio);
 	}
 
 	bio_put(bio);
@@ -59,13 +61,21 @@ static void mpage_read_end_io(struct bio *bio)
 
 static void mpage_write_end_io(struct bio *bio)
 {
-	struct bio_vec *bv;
-	struct bvec_iter_all iter_all;
+	struct folio_iter fi;
+	int err = blk_status_to_errno(bio->bi_status);
 
-	bio_for_each_segment_all(bv, bio, iter_all) {
-		struct page *page = bv->bv_page;
-		page_endio(page, REQ_OP_WRITE,
-			   blk_status_to_errno(bio->bi_status));
+	bio_for_each_folio_all(fi, bio) {
+		struct folio *folio = fi.folio;
+
+		if (err) {
+			struct address_space *mapping;
+
+			folio_set_error(folio);
+			mapping = folio_mapping(folio);
+			if (mapping)
+				mapping_set_error(mapping, err);
+		}
+		folio_end_writeback(folio);
 	}
 
 	bio_put(bio);
-- 
2.34.1