f2fs crypto: zero next free dnode block

chaseyu · Jaegeuk Kim · commit cb5c94cf3a82 · 2015-06-01T16:21:00.000-07:00
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 &lt;chao2.yu@samsung.com&gt;
Signed-off-by: Jaegeuk Kim &lt;jaegeuk@kernel.org&gt;
diff --git 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);
 	}

Original file line number	Diff line number	Diff line change
`@@ -519,7 +519,7 @@ void discard_next_dnode(struct f2fs_sb_info *sbi, block_t blkaddr)`
`519`	`519`
`520`	`520`	`if (err) {`
`521`	`521`	`struct page *page = grab_meta_page(sbi, blkaddr);`
`522`		`- /* zero-filled page */`
	`522`	`+ memset(page_address(page), 0, F2FS_BLKSIZE);`
`523`	`523`	`set_page_dirty(page);`
`524`	`524`	`f2fs_put_page(page, 1);`
`525`	`525`	`}`