linux-ext4 - [RFC PATCH 3/8] null_blk: use memcpy_page() in copy_to

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Date:   Sun,  7 Feb 2021 11:04:20 -0800
From:   Chaitanya Kulkarni <chaitanya.kulkarni@....com>
To:     linux-block@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org
Cc:     axboe@...nel.dk, tytso@....edu, adilger.kernel@...ger.ca,
        jaegeuk@...nel.org, chao@...nel.org, johannes.thumshirn@....com,
        damien.lemoal@....com, bvanassche@....org,
        chaitanya.kulkarni@....com, dongli.zhang@...cle.com, clm@...com,
        ira.weiny@...el.com, dsterba@...e.com, ebiggers@...nel.org,
        hch@...radead.org, dave.hansen@...el.com
Subject: [RFC PATCH 3/8] null_blk: use memcpy_page() in copy_to_nullb()

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
---
 drivers/block/null_blk/main.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index d6c821d48090..c9b6db82b07c 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -1010,7 +1010,6 @@ static int copy_to_nullb(struct nullb *nullb, struct page *source,
 	size_t temp, count = 0;
 	unsigned int offset;
 	struct nullb_page *t_page;
-	void *dst, *src;
 
 	while (count < n) {
 		temp = min_t(size_t, nullb->dev->blocksize, n - count);
@@ -1024,11 +1023,7 @@ static int copy_to_nullb(struct nullb *nullb, struct page *source,
 		if (!t_page)
 			return -ENOSPC;
 
-		src = kmap_atomic(source);
-		dst = kmap_atomic(t_page->page);
-		memcpy(dst + offset, src + off + count, temp);
-		kunmap_atomic(dst);
-		kunmap_atomic(src);
+		memcpy_page(t_page->page, offset, source, off + count, temp);
 
 		__set_bit(sector & SECTOR_MASK, t_page->bitmap);
 
-- 
2.22.1