f2fs crypto: zero next free dnode block

Now page cache of meta inode is used by garbage collection for encrypted page,
it may contain random data, so we should zero it before issuing discard.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e0821d2c39e49ba8df2483b356a39bf0344c5852..7254c11344bee01185ae72278c4e18fbd9274572 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -519,7 +519,7 @@ void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)
 
        if (err) {
                struct page *page = grab_meta_page(sbi, blkaddr);
-               /* zero-filled page */
+               memset(page_address(page), 0, F2FS_BLKSIZE);
                set_page_dirty(page);
                f2fs_put_page(page, 1);
        }