From patchwork Wed Aug 31 07:21:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Yi X-Patchwork-Id: 12960446 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4DAABECAAD3 for ; Wed, 31 Aug 2022 07:10:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230522AbiHaHKk (ORCPT ); Wed, 31 Aug 2022 03:10:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230220AbiHaHK2 (ORCPT ); Wed, 31 Aug 2022 03:10:28 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 84E831570E; Wed, 31 Aug 2022 00:10:11 -0700 (PDT) Received: from canpemm500005.china.huawei.com (unknown [172.30.72.55]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4MHZyZ1dDqzHnZL; Wed, 31 Aug 2022 15:08:22 +0800 (CST) Received: from huawei.com (10.175.127.227) by canpemm500005.china.huawei.com (7.192.104.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Wed, 31 Aug 2022 15:10:08 +0800 From: Zhang Yi To: , , , , , , CC: , , , , , , , , , , , , , Subject: [PATCH 08/14] ocfs2: replace ll_rw_block() Date: Wed, 31 Aug 2022 15:21:05 +0800 Message-ID: <20220831072111.3569680-9-yi.zhang@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220831072111.3569680-1-yi.zhang@huawei.com> References: <20220831072111.3569680-1-yi.zhang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To canpemm500005.china.huawei.com (7.192.104.229) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org ll_rw_block() is not safe for the sync read path because it cannot guarantee that submitting read IO if the buffer has been locked. We could get false positive EIO after wait_on_buffer() if the buffer has been locked by others. So stop using ll_rw_block() in ocfs2. Signed-off-by: Zhang Yi --- fs/ocfs2/aops.c | 2 +- fs/ocfs2/super.c | 5 +---- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c index af4157f61927..1d65f6ef00ca 100644 --- a/fs/ocfs2/aops.c +++ b/fs/ocfs2/aops.c @@ -636,7 +636,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, !buffer_new(bh) && ocfs2_should_read_blk(inode, page, block_start) && (block_start < from || block_end > to)) { - ll_rw_block(REQ_OP_READ, 1, &bh); + bh_read_nowait(bh, 0); *wait_bh++=bh; } diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index e2cc9eec287c..4050f35bbd0c 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -1763,10 +1763,7 @@ static int ocfs2_get_sector(struct super_block *sb, lock_buffer(*bh); if (!buffer_dirty(*bh)) clear_buffer_uptodate(*bh); - unlock_buffer(*bh); - ll_rw_block(REQ_OP_READ, 1, bh); - wait_on_buffer(*bh); - if (!buffer_uptodate(*bh)) { + if (bh_read_locked(*bh, 0)) { mlog_errno(-EIO); brelse(*bh); *bh = NULL;