From patchwork Sun Oct 25 03:41:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chengguang Xu X-Patchwork-Id: 11855149 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C5506697 for ; Sun, 25 Oct 2020 03:42:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A9FAD21734 for ; Sun, 25 Oct 2020 03:42:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mykernel.net header.i=cgxu519@mykernel.net header.b="cCIvohux" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1766965AbgJYDm2 (ORCPT ); Sat, 24 Oct 2020 23:42:28 -0400 Received: from sender2-op-o12.zoho.com.cn ([163.53.93.243]:17171 "EHLO sender2-op-o12.zoho.com.cn" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1766956AbgJYDm2 (ORCPT ); Sat, 24 Oct 2020 23:42:28 -0400 ARC-Seal: i=1; a=rsa-sha256; t=1603597314; cv=none; d=zoho.com.cn; s=zohoarc; b=cJglc88SO8/m5vvnaacGcQMt4ag/Bcta6ROObVljeZRH8kYjtQzdY6KKT8TyrzE86gAmYDfzQceZ4sT+NTDovmCj2rIyaBlLtnXTGw9jCzIPlyXczxagjuxCqDupOAGdUYXtJ/js0dmUJKpik8pSmZXKgZIsZQOBse8ABh8i3ZU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com.cn; s=zohoarc; t=1603597314; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=YQPSQWMCt9yX/niXxA9Y98SHIHVYHo3mXqsbyMEGE6M=; b=ZWl2wCbuZIxLUKfIaGOCGr3hY4MR7Rqd3Y6k9JU1y9DjF0byLplTYl/GpBiaFA96sY/FU/IeaY83SsUBFJSunOfR0Y3Er1h0eZ4wNNZv9L8nSBCZrfN/B9el6fK8mVA7xnE+R6CIKeB59cBdivvIRgdRmiNwbuYDToyc09eyJ0U= ARC-Authentication-Results: i=1; mx.zoho.com.cn; dkim=pass header.i=mykernel.net; spf=pass smtp.mailfrom=cgxu519@mykernel.net; dmarc=pass header.from= header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1603597314; s=zohomail; d=mykernel.net; i=cgxu519@mykernel.net; h=From:To:Cc:Message-ID:Subject:Date:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Content-Type; bh=YQPSQWMCt9yX/niXxA9Y98SHIHVYHo3mXqsbyMEGE6M=; b=cCIvohuxRjAO3GwMucSWhaGL1vziikLfVmMSYKgDcDwTe+mwPdPMci0hM3acuX3D xfyP3dyddxmgq9AqGH6UukIetWm8VUMMzbOlVDrIbaOXqf0aJ9Bz8UotLetxDomXOh1 AIrcYZxMrtL7V3ITdTW4b3YWw0b4oV+4Tl/L27e4= Received: from localhost.localdomain (113.88.132.7 [113.88.132.7]) by mx.zoho.com.cn with SMTPS id 1603597313166589.9733889441386; Sun, 25 Oct 2020 11:41:53 +0800 (CST) From: Chengguang Xu To: miklos@szeredi.hu, amir73il@gmail.com, jack@suse.cz Cc: linux-unionfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, Chengguang Xu Message-ID: <20201025034117.4918-7-cgxu519@mykernel.net> Subject: [RFC PATCH v2 6/8] ovl: implement overlayfs' ->write_inode operation Date: Sun, 25 Oct 2020 11:41:15 +0800 X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201025034117.4918-1-cgxu519@mykernel.net> References: <20201025034117.4918-1-cgxu519@mykernel.net> MIME-Version: 1.0 X-ZohoCNMailClient: External Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Implement overlayfs' ->write_inode to sync dirty data and redirty overlayfs' inode if necessary. Signed-off-by: Chengguang Xu --- fs/overlayfs/super.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 5d7e12b8bd1f..960e79e7a8b5 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "overlayfs.h" MODULE_AUTHOR("Miklos Szeredi "); @@ -396,11 +397,36 @@ static void ovl_evict_inode (struct inode *inode) clear_inode(inode); } +static int ovl_write_inode(struct inode *inode, + struct writeback_control *wbc) +{ + struct inode *upper = ovl_inode_upper(inode); + unsigned long iflag = 0; + int ret = 0; + + if (!upper) + return 0; + + if (upper->i_sb->s_op->write_inode) + ret = upper->i_sb->s_op->write_inode(inode, wbc); + + iflag |= upper->i_state & I_DIRTY_ALL; + if (mapping_writably_mapped(upper->i_mapping) || + mapping_tagged(upper->i_mapping, PAGECACHE_TAG_WRITEBACK)) + iflag |= I_DIRTY_PAGES; + + if (iflag) + ovl_mark_inode_dirty(inode); + + return ret; +} + static const struct super_operations ovl_super_operations = { .alloc_inode = ovl_alloc_inode, .free_inode = ovl_free_inode, .destroy_inode = ovl_destroy_inode, .drop_inode = generic_delete_inode, + .write_inode = ovl_write_inode, .evict_inode = ovl_evict_inode, .put_super = ovl_put_super, .sync_fs = ovl_sync_fs,