From patchwork Tue Sep 7 12:42:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hanna Czenczek X-Patchwork-Id: 12478669 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 6806FC433F5 for ; Tue, 7 Sep 2021 13:08:55 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 00FC861052 for ; Tue, 7 Sep 2021 13:08:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 00FC861052 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:52138 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mNaqM-000402-5l for qemu-devel@archiver.kernel.org; Tue, 07 Sep 2021 09:08:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47184) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mNaRM-0005oY-RL for qemu-devel@nongnu.org; Tue, 07 Sep 2021 08:43:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:49216) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mNaRL-0006Iq-27 for qemu-devel@nongnu.org; Tue, 07 Sep 2021 08:43:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1631018582; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WLRadZI2ORHjlQn7wV/pYi+psOkvU/P69v7H3B/fBAQ=; b=iEzxpuU2J8c0FeK7X4eWbkX5XgZR8kaiX05Nxutvy16ONlT5kSFuU5HwJ+OhaH7sLI6/Eo Um9gfUxU89qyNwE4EGrxp81LkRahJgiZ46loOmTwfeBDdJnroG8zitnxFHlzEXz2aa1WPl ViWSkCYre3pOTmsr5MAZuIcioH76eMw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-406-PgtnWsgyN--sGtTjdw1ffw-1; Tue, 07 Sep 2021 08:43:01 -0400 X-MC-Unique: PgtnWsgyN--sGtTjdw1ffw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6B5EF835DE4; Tue, 7 Sep 2021 12:43:00 +0000 (UTC) Received: from localhost (unknown [10.39.193.128]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 1447F12D4A; Tue, 7 Sep 2021 12:42:59 +0000 (UTC) From: Hanna Reitz To: qemu-block@nongnu.org Subject: [PATCH v4 06/12] jobs: Give Job.force_cancel more meaning Date: Tue, 7 Sep 2021 14:42:39 +0200 Message-Id: <20210907124245.143492-7-hreitz@redhat.com> In-Reply-To: <20210907124245.143492-1-hreitz@redhat.com> References: <20210907124245.143492-1-hreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=hreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=hreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.391, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Hanna Reitz , Vladimir Sementsov-Ogievskiy , Eric Blake , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" We largely have two cancel modes for jobs: First, there is actual cancelling. The job is terminated as soon as possible, without trying to reach a consistent result. Second, we have mirror in the READY state. Technically, the job is not really cancelled, but it just is a different completion mode. The job can still run for an indefinite amount of time while it tries to reach a consistent result. We want to be able to clearly distinguish which cancel mode a job is in (when it has been cancelled). We can use Job.force_cancel for this, but right now it only reflects cancel requests from the user with force=true, but clearly, jobs that do not even distinguish between force=false and force=true are effectively always force-cancelled. So this patch has Job.force_cancel signify whether the job will terminate as soon as possible (force_cancel=true) or whether it will effectively remain running despite being "cancelled" (force_cancel=false). To this end, we let jobs that provide JobDriver.cancel() tell the generic job code whether they will terminate as soon as possible or not, and for jobs that do not provide that method we assume they will. Signed-off-by: Hanna Reitz Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Kevin Wolf --- include/qemu/job.h | 11 ++++++++++- block/backup.c | 3 ++- block/mirror.c | 24 ++++++++++++++++++------ job.c | 6 +++++- 4 files changed, 35 insertions(+), 9 deletions(-) diff --git a/include/qemu/job.h b/include/qemu/job.h index 2eddf3b536..90f6abbd6a 100644 --- a/include/qemu/job.h +++ b/include/qemu/job.h @@ -253,8 +253,17 @@ struct JobDriver { /** * If the callback is not NULL, it will be invoked in job_cancel_async + * + * This function must return true if the job will be cancelled + * immediately without any further I/O (mandatory if @force is + * true), and false otherwise. This lets the generic job layer + * know whether a job has been truly (force-)cancelled, or whether + * it is just in a special completion mode (like mirror after + * READY). + * (If the callback is NULL, the job is assumed to terminate + * without I/O.) */ - void (*cancel)(Job *job, bool force); + bool (*cancel)(Job *job, bool force); /** Called when the job is freed */ diff --git a/block/backup.c b/block/backup.c index 687d2882bc..e8a13f9178 100644 --- a/block/backup.c +++ b/block/backup.c @@ -327,11 +327,12 @@ static void coroutine_fn backup_set_speed(BlockJob *job, int64_t speed) } } -static void backup_cancel(Job *job, bool force) +static bool backup_cancel(Job *job, bool force) { BackupBlockJob *s = container_of(job, BackupBlockJob, common.job); bdrv_cancel_in_flight(s->target_bs); + return true; } static const BlockJobDriver backup_job_driver = { diff --git a/block/mirror.c b/block/mirror.c index fcb7b65f93..e93631a9f6 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -1087,9 +1087,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp) trace_mirror_before_sleep(s, cnt, job_is_ready(&s->common.job), delay_ns); job_sleep_ns(&s->common.job, delay_ns); - if (job_is_cancelled(&s->common.job) && - (!job_is_ready(&s->common.job) || s->common.job.force_cancel)) - { + if (job_is_cancelled(&s->common.job) && s->common.job.force_cancel) { break; } s->last_pause_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME); @@ -1102,7 +1100,7 @@ immediate_exit: * the target is a copy of the source. */ assert(ret < 0 || - ((s->common.job.force_cancel || !job_is_ready(&s->common.job)) && + (s->common.job.force_cancel && job_is_cancelled(&s->common.job))); assert(need_drain); mirror_wait_for_all_io(s); @@ -1188,14 +1186,27 @@ static bool mirror_drained_poll(BlockJob *job) return !!s->in_flight; } -static void mirror_cancel(Job *job, bool force) +static bool mirror_cancel(Job *job, bool force) { MirrorBlockJob *s = container_of(job, MirrorBlockJob, common.job); BlockDriverState *target = blk_bs(s->target); - if (force || !job_is_ready(job)) { + /* + * Before the job is READY, we treat any cancellation like a + * force-cancellation. + */ + force = force || !job_is_ready(job); + + if (force) { bdrv_cancel_in_flight(target); } + return force; +} + +static bool commit_active_cancel(Job *job, bool force) +{ + /* Same as above in mirror_cancel() */ + return force || !job_is_ready(job); } static const BlockJobDriver mirror_job_driver = { @@ -1225,6 +1236,7 @@ static const BlockJobDriver commit_active_job_driver = { .abort = mirror_abort, .pause = mirror_pause, .complete = mirror_complete, + .cancel = commit_active_cancel, }, .drained_poll = mirror_drained_poll, }; diff --git a/job.c b/job.c index dfac35d553..81c016eb10 100644 --- a/job.c +++ b/job.c @@ -719,8 +719,12 @@ static int job_finalize_single(Job *job) static void job_cancel_async(Job *job, bool force) { if (job->driver->cancel) { - job->driver->cancel(job, force); + force = job->driver->cancel(job, force); + } else { + /* No .cancel() means the job will behave as if force-cancelled */ + force = true; } + if (job->user_paused) { /* Do not call job_enter here, the caller will handle it. */ if (job->driver->user_resume) {