f2fs: fix to wait page writeback during revoking atomic write

After revoking atomic write, related LBA can be reused by others, so we
need to wait page writeback before reusing the LBA, in order to avoid
interference between old atomic written in-flight IO and new IO.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -230,6 +230,8 @@ static int __revoke_inmem_pages(struct inode *inode,
 
 		lock_page(page);
 
+		f2fs_wait_on_page_writeback(page, DATA, true);
+
 		if (recover) {
 			struct dnode_of_data dn;
 			struct node_info ni;