linux-kernel - [RFC v2 3/5] mpage: split bi_end_io callback for reads and writes

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Message-Id: <20230322135013.197076-4-p.raghav@samsung.com>
Date:   Wed, 22 Mar 2023 14:50:11 +0100
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     senozhatsky@...omium.org, viro@...iv.linux.org.uk, axboe@...nel.dk,
        willy@...radead.org, brauner@...nel.org, akpm@...ux-foundation.org,
        minchan@...nel.org, hubcap@...ibond.com, martin@...ibond.com
Cc:     mcgrof@...nel.org, devel@...ts.orangefs.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, gost.dev@...sung.com,
        Pankaj Raghav <p.raghav@...sung.com>,
        Christoph Hellwig <hch@....de>
Subject: [RFC v2 3/5] mpage: split bi_end_io callback for reads and writes

Split the bi_end_io handler for reads and writes similar to other aops.
This is a prep patch before we convert end_io handlers to use folios.

Suggested-by: Christoph Hellwig <hch@....de>
Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
---
 fs/mpage.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/fs/mpage.c b/fs/mpage.c
index 22b9de5ddd68..3a545bf0f184 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -43,14 +43,28 @@
  * status of that page is hard.  See end_buffer_async_read() for the details.
  * There is no point in duplicating all that complexity.
  */
-static void mpage_end_io(struct bio *bio)
+static void mpage_read_end_io(struct bio *bio)
 {
 	struct bio_vec *bv;
 	struct bvec_iter_all iter_all;
 
 	bio_for_each_segment_all(bv, bio, iter_all) {
 		struct page *page = bv->bv_page;
-		page_endio(page, bio_op(bio),
+		page_endio(page, REQ_OP_READ,
+			   blk_status_to_errno(bio->bi_status));
+	}
+
+	bio_put(bio);
+}
+
+static void mpage_write_end_io(struct bio *bio)
+{
+	struct bio_vec *bv;
+	struct bvec_iter_all iter_all;
+
+	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));
 	}
 
@@ -59,7 +73,11 @@ static void mpage_end_io(struct bio *bio)
 
 static struct bio *mpage_bio_submit(struct bio *bio)
 {
-	bio->bi_end_io = mpage_end_io;
+	if (op_is_write(bio_op(bio)))
+		bio->bi_end_io = mpage_write_end_io;
+	else
+		bio->bi_end_io = mpage_read_end_io;
+
 	guard_bio_eod(bio);
 	submit_bio(bio);
 	return NULL;
-- 
2.34.1