From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Date: Sun, 7 Feb 2021 19:04:23 +0000 (-0800)
Subject: ext4: use memcpy_to_page() in pagecache_write()
X-Git-Tag: accepted/tizen/unified/20230118.172025~7110^2~37
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bd256fda92efe97b692dc72e246d35fa724d42d8;p=platform%2Fkernel%2Flinux-rpi.git

ext4: use memcpy_to_page() in pagecache_write()

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210207190425.38107-7-chaitanya.kulkarni@wdc.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index daf8866..c6ed2aa 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);