From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-f171.google.com (mail-lb0-f171.google.com [209.85.217.171]) by kanga.kvack.org (Postfix) with ESMTP id E93876B0037 for ; Tue, 23 Sep 2014 11:03:37 -0400 (EDT) Received: by mail-lb0-f171.google.com with SMTP id l4so8941748lbv.30 for ; Tue, 23 Sep 2014 08:03:36 -0700 (PDT) Received: from mx2.suse.de (cantor2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id kz8si19086995lab.23.2014.09.23.08.03.34 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Tue, 23 Sep 2014 08:03:34 -0700 (PDT) From: Jan Kara Subject: [PATCH 2/2] ext4: Fix mmap data corruption when blocksize < pagesize Date: Tue, 23 Sep 2014 17:03:23 +0200 Message-Id: <1411484603-17756-3-git-send-email-jack@suse.cz> In-Reply-To: <1411484603-17756-1-git-send-email-jack@suse.cz> References: <1411484603-17756-1-git-send-email-jack@suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: linux-fsdevel@vger.kernel.org Cc: linux-mm@kvack.org, Dave Chinner , linux-ext4@vger.kernel.org, Ted Tso , Jan Kara Use block_create_hole() when hole is being created in a file so that ->page_mkwrite() will get called for the partial tail page if it is mmaped (see the first patch in the series for details). Signed-off-by: Jan Kara --- fs/ext4/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 3aa26e9117c4..fdcb007c2c9e 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4536,8 +4536,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) ext4_orphan_del(NULL, inode); goto err_out; } - } else + } else { + loff_t old_size = inode->i_size; + i_size_write(inode, attr->ia_size); + block_create_hole(inode, old_size, inode->i_size); + } /* * Blocks are going to be removed from the inode. Wait -- 1.8.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org