From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F055EC433DF for ; Fri, 5 Jun 2020 12:29:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CCEFF2075B for ; Fri, 5 Jun 2020 12:29:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591360169; bh=apDgnAQBd/K2/3jrja5jP8BCQtPiv1jeDJYxqBqjj+E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Trd71ykTUsY5+MRSFcjDVvib+lKZ2JhkHGsqJn77AiI5NBGlctjNqC7UFOVF8mb2T bVs9UUiuzQ9w8/CVs9dgpMB5JLLubKQcf32t0lScsiI6tbgpMYvBkCjUeNc2khE7gd P1dWXtLDgN5gx9tRu/sl/aMFwULUuHU9aZqe9aa0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728120AbgFEM30 (ORCPT ); Fri, 5 Jun 2020 08:29:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:57690 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726981AbgFEMZx (ORCPT ); Fri, 5 Jun 2020 08:25:53 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B273B20835; Fri, 5 Jun 2020 12:25:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591359952; bh=apDgnAQBd/K2/3jrja5jP8BCQtPiv1jeDJYxqBqjj+E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jisyzQSvJtRQz6WCoTv9TPKO1gBRFDEN04BjIHwqI4fmXFMN8ruWajVNzTKEp6aS2 9aq09h/Sg2Dmtj24Xw4CnDnVZgQEBfRDUlkA8JWMBS9Eln7qBZCHluOrkNSVWjBAp9 /nnA7X07FcAKMsg4QZ63Kq8pGiT02gP6Xz8DcCis= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andreas Gruenbacher , Bob Peterson , Sasha Levin , cluster-devel@redhat.com Subject: [PATCH AUTOSEL 5.4 10/14] gfs2: Even more gfs2_find_jhead fixes Date: Fri, 5 Jun 2020 08:25:36 -0400 Message-Id: <20200605122540.2882539-10-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200605122540.2882539-1-sashal@kernel.org> References: <20200605122540.2882539-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andreas Gruenbacher [ Upstream commit 20be493b787cd581c9fffad7fcd6bfbe6af1050c ] Fix several issues in the previous gfs2_find_jhead fix: * When updating @blocks_submitted, @block refers to the first block block not submitted yet, not the last block submitted, so fix an off-by-one error. * We want to ensure that @blocks_submitted is far enough ahead of @blocks_read to guarantee that there is in-flight I/O. Otherwise, we'll eventually end up waiting for pages that haven't been submitted, yet. * It's much easier to compare the number of blocks added with the number of blocks submitted to limit the maximum bio size. * Even with bio chaining, we can keep adding blocks until we reach the maximum bio size, as long as we stop at a page boundary. This simplifies the logic. Signed-off-by: Andreas Gruenbacher Reviewed-by: Bob Peterson Signed-off-by: Sasha Levin --- fs/gfs2/lops.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c index 8303b44a5068..d2ed4dc4434c 100644 --- a/fs/gfs2/lops.c +++ b/fs/gfs2/lops.c @@ -504,12 +504,12 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, unsigned int bsize = sdp->sd_sb.sb_bsize, off; unsigned int bsize_shift = sdp->sd_sb.sb_bsize_shift; unsigned int shift = PAGE_SHIFT - bsize_shift; - unsigned int max_bio_size = 2 * 1024 * 1024; + unsigned int max_blocks = 2 * 1024 * 1024 >> bsize_shift; struct gfs2_journal_extent *je; int sz, ret = 0; struct bio *bio = NULL; struct page *page = NULL; - bool bio_chained = false, done = false; + bool done = false; errseq_t since; memset(head, 0, sizeof(*head)); @@ -532,10 +532,7 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, off = 0; } - if (!bio || (bio_chained && !off) || - bio->bi_iter.bi_size >= max_bio_size) { - /* start new bio */ - } else { + if (bio && (off || block < blocks_submitted + max_blocks)) { sector_t sector = dblock << sdp->sd_fsb2bb_shift; if (bio_end_sector(bio) == sector) { @@ -548,19 +545,17 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, (PAGE_SIZE - off) >> bsize_shift; bio = gfs2_chain_bio(bio, blocks); - bio_chained = true; goto add_block_to_new_bio; } } if (bio) { - blocks_submitted = block + 1; + blocks_submitted = block; submit_bio(bio); } bio = gfs2_log_alloc_bio(sdp, dblock, gfs2_end_log_read); bio->bi_opf = REQ_OP_READ; - bio_chained = false; add_block_to_new_bio: sz = bio_add_page(bio, page, bsize, off); BUG_ON(sz != bsize); @@ -568,7 +563,7 @@ int gfs2_find_jhead(struct gfs2_jdesc *jd, struct gfs2_log_header_host *head, off += bsize; if (off == PAGE_SIZE) page = NULL; - if (blocks_submitted < 2 * max_bio_size >> bsize_shift) { + if (blocks_submitted <= blocks_read + max_blocks) { /* Keep at least one bio in flight */ continue; } -- 2.25.1