linux-kernel - [PATCH v1 3/6] bio: deduplicate adding a page into bio

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Date:   Tue, 15 Dec 2020 00:20:22 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     linux-block@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Ming Lei <ming.lei@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Jonathan Corbet <corbet@....net>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, target-devel@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH v1 3/6] bio: deduplicate adding a page into bio

Both bio_add_hw_page() mimics bio_add_page() and has a hand-coded
version of appending a page into bio's bvec. DRY

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 block/bio.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index 1f2cc1fbe283..4a8f77bb3956 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -734,6 +734,22 @@ const char *bio_devname(struct bio *bio, char *buf)
 }
 EXPORT_SYMBOL(bio_devname);
 
+static void bio_add_page_noaccount(struct bio *bio, struct page *page,
+				   unsigned int len, unsigned int off)
+{
+	struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt];
+
+	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
+	WARN_ON_ONCE(bio_full(bio, len));
+
+	bv->bv_page = page;
+	bv->bv_offset = off;
+	bv->bv_len = len;
+
+	bio->bi_iter.bi_size += len;
+	bio->bi_vcnt++;
+}
+
 static inline bool page_is_mergeable(const struct bio_vec *bv,
 		struct page *page, unsigned int len, unsigned int off,
 		bool *same_page)
@@ -818,12 +834,7 @@ int bio_add_hw_page(struct request_queue *q, struct bio *bio,
 	if (bio->bi_vcnt >= queue_max_segments(q))
 		return 0;
 
-	bvec = &bio->bi_io_vec[bio->bi_vcnt];
-	bvec->bv_page = page;
-	bvec->bv_len = len;
-	bvec->bv_offset = offset;
-	bio->bi_vcnt++;
-	bio->bi_iter.bi_size += len;
+	bio_add_page_noaccount(bio, page, len, offset);
 	return len;
 }
 
@@ -903,18 +914,7 @@ EXPORT_SYMBOL_GPL(__bio_try_merge_page);
 void __bio_add_page(struct bio *bio, struct page *page,
 		unsigned int len, unsigned int off)
 {
-	struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt];
-
-	WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
-	WARN_ON_ONCE(bio_full(bio, len));
-
-	bv->bv_page = page;
-	bv->bv_offset = off;
-	bv->bv_len = len;
-
-	bio->bi_iter.bi_size += len;
-	bio->bi_vcnt++;
-
+	bio_add_page_noaccount(bio, page, len, off);
 	if (!bio_flagged(bio, BIO_WORKINGSET) && unlikely(PageWorkingset(page)))
 		bio_set_flag(bio, BIO_WORKINGSET);
 }
-- 
2.24.0