linux-ext4 - [RFC PATCH 6/8] ext4: use memcpy_to_page() in pagecache

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Message-Id: <20210207190425.38107-7-chaitanya.kulkarni@wdc.com>
Date:   Sun,  7 Feb 2021 11:04:23 -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 6/8] ext4: use memcpy_to_page() in pagecache_write()

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@....com>
---
 fs/ext4/verity.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index c8e07f8a792d..cc4b046490b0 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -77,7 +77,6 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
 				 PAGE_SIZE - offset_in_page(pos));
 		struct page *page;
 		void *fsdata;
-		void *addr;
 		int res;
 
 		res = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0,
@@ -85,9 +84,7 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
 		if (res)
 			return res;
 
-		addr = kmap_atomic(page);
-		memcpy(addr + offset_in_page(pos), buf, n);
-		kunmap_atomic(addr);
+		memcpy_to_page(page, offset_in_page(pos), buf, n);
 
 		res = pagecache_write_end(NULL, inode->i_mapping, pos, n, n,
 					  page, fsdata);
-- 
2.22.1