From: Chao Yu <chao2.yu@samsung.com>
Date: Mon, 18 May 2015 10:00:06 +0000 (+0800)
Subject: f2fs crypto: zero next free dnode block
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cb5c94cf3a825a0b64ae84516e7dd5c8a59befe6;p=linux-beck.git

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 e0821d2c39e4..7254c11344be 100644
--- 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);
 	}