From patchwork Wed Aug 31 07:21:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Yi X-Patchwork-Id: 12960445 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 90BF2C0502C for ; Wed, 31 Aug 2022 07:10:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229752AbiHaHKZ (ORCPT ); Wed, 31 Aug 2022 03:10:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230454AbiHaHKL (ORCPT ); Wed, 31 Aug 2022 03:10:11 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 013D117056; Wed, 31 Aug 2022 00:10:09 -0700 (PDT) Received: from canpemm500005.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4MHZwN44tbz1N7gY; Wed, 31 Aug 2022 15:06:28 +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 15:10:06 +0800 From: Zhang Yi To: , , , , , , CC: , , , , , , , , , , , , , Subject: [PATCH 06/14] jbd2: replace ll_rw_block() Date: Wed, 31 Aug 2022 15:21:03 +0800 Message-ID: <20220831072111.3569680-7-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 journal_get_superblock(). We also switch to new bh_readahead_batch() for the buffer array readahead path. Signed-off-by: Zhang Yi Reviewed-by: Jan Kara --- fs/jbd2/journal.c | 7 +++---- fs/jbd2/recovery.c | 16 ++++++++++------ 2 files changed, 13 insertions(+), 10 deletions(-) diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 6350d3857c89..5a903aae6aad 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1893,15 +1893,14 @@ static int journal_get_superblock(journal_t *journal) { struct buffer_head *bh; journal_superblock_t *sb; - int err = -EIO; + int err; bh = journal->j_sb_buffer; J_ASSERT(bh != NULL); if (!buffer_uptodate(bh)) { - ll_rw_block(REQ_OP_READ, 1, &bh); - wait_on_buffer(bh); - if (!buffer_uptodate(bh)) { + err = bh_read(bh, 0); + if (err) { printk(KERN_ERR "JBD2: IO error reading journal superblock\n"); goto out; diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c index f548479615c6..ee56a30b71cf 100644 --- a/fs/jbd2/recovery.c +++ b/fs/jbd2/recovery.c @@ -100,7 +100,7 @@ static int do_readahead(journal_t *journal, unsigned int start) if (!buffer_uptodate(bh) && !buffer_locked(bh)) { bufs[nbufs++] = bh; if (nbufs == MAXBUF) { - ll_rw_block(REQ_OP_READ, nbufs, bufs); + bh_readahead_batch(bufs, nbufs, 0); journal_brelse_array(bufs, nbufs); nbufs = 0; } @@ -109,7 +109,7 @@ static int do_readahead(journal_t *journal, unsigned int start) } if (nbufs) - ll_rw_block(REQ_OP_READ, nbufs, bufs); + bh_readahead_batch(bufs, nbufs, 0); err = 0; failed: @@ -152,9 +152,14 @@ static int jread(struct buffer_head **bhp, journal_t *journal, return -ENOMEM; if (!buffer_uptodate(bh)) { - /* If this is a brand new buffer, start readahead. - Otherwise, we assume we are already reading it. */ - if (!buffer_req(bh)) + /* + * If this is a brand new buffer, start readahead. + * Otherwise, we assume we are already reading it. + */ + bool need_readahead = !buffer_req(bh); + + bh_read_nowait(bh, 0); + if (need_readahead) do_readahead(journal, offset); wait_on_buffer(bh); } @@ -687,7 +692,6 @@ static int do_one_pass(journal_t *journal, mark_buffer_dirty(nbh); BUFFER_TRACE(nbh, "marking uptodate"); ++info->nr_replays; - /* ll_rw_block(WRITE, 1, &nbh); */ unlock_buffer(nbh); brelse(obh); brelse(nbh);