ext4: use memcpy_from_page() in pagecache_read()

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210207190425.38107-6-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 00e3cbd..daf8866 100644 (file)
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -45,16 +45,13 @@ static int pagecache_read(struct inode *inode, void *buf, size_t count,
                size_t n = min_t(size_t, count,
                                 PAGE_SIZE - offset_in_page(pos));
                struct page *page;
-               void *addr;
 
                page = read_mapping_page(inode->i_mapping, pos >> PAGE_SHIFT,
                                         NULL);
                if (IS_ERR(page))
                        return PTR_ERR(page);
 
-               addr = kmap_atomic(page);
-               memcpy(buf, addr + offset_in_page(pos), n);
-               kunmap_atomic(addr);
+               memcpy_from_page(buf, page, offset_in_page(pos), n);
 
                put_page(page);