This is a note to let you know that I've just added the patch titled
ext4: use memcpy_to_page() in pagecache_write()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-use-memcpy_to_page-in-pagecache_write.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0b8b519467585e564104f6fdeb80aeba83ac0bc9
Author: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
Date: Sun Feb 7 11:04:23 2021 -0800
ext4: use memcpy_to_page() in pagecache_write()
[ Upstream commit bd256fda92efe97b692dc72e246d35fa724d42d8 ]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
Link: https://lore.kernel.org/r/20210207190425.38107-7-chaitanya.kulkarni@xxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Stable-dep-of: 956510c0c743 ("fs: ext4: initialize fsdata in pagecache_write()")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index 6a30e54c1128..0c67b7060eb4 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -80,7 +80,6 @@ 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,
@@ -88,9 +87,7 @@ 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);
