From nobody Sun Feb 8 17:21:23 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1585237125; cv=none; d=zohomail.com; s=zohoarc; b=DyIH12FaXQ6AdQ0RHF/lQS53DonO9MMn6nIoDvcotAjtLT4OuffU/EBwOA9GWzzRFYE5KrmmfvTzz9zDYuBfBnGfMe+o/L1FuNx9+Wuv3cOXUd9CoHnw0MseLMIR3GeUck8neNi+px6nURTwMea+0RYFR+EIBhCgRBU/mBjMI/k= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1585237125; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=/8wyeUj06KXeS38TLcF04SKwHtzws1PB37ZwA+U4vxc=; b=gOsiPypA4yA7EFDMHSTOJu2hv0xU1m3ZSXkDMVLcwiwlwdTQBdop2fk3pewu2J9cBga+BiakvD8R91DjxSzf560gMM+lrwRTYO4K5H+OUNJEGcf/QcXWo2jMJQM4CpU49snnVddlBWacFuLo/oCqzeO05H8D4g0pbsNjcvf9Wk0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1585237125629973.5831674427955; Thu, 26 Mar 2020 08:38:45 -0700 (PDT) Received: from localhost ([::1]:55546 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jHUai-0007Qg-FL for importer@patchew.org; Thu, 26 Mar 2020 11:38:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54458) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jHUYn-0005Vn-5p for qemu-devel@nongnu.org; Thu, 26 Mar 2020 11:36:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jHUYk-0002rO-M1 for qemu-devel@nongnu.org; Thu, 26 Mar 2020 11:36:44 -0400 Received: from us-smtp-delivery-74.mimecast.com ([63.128.21.74]:49948) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jHUYi-0002pW-Ou for qemu-devel@nongnu.org; Thu, 26 Mar 2020 11:36:42 -0400 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-306-NJixbO6bMdeyNjBOvkuDZw-1; Thu, 26 Mar 2020 11:36:37 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id EEEB0A0CBF; Thu, 26 Mar 2020 15:36:36 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-112-205.ams2.redhat.com [10.36.112.205]) by smtp.corp.redhat.com (Postfix) with ESMTP id A4A2D5C1BA; Thu, 26 Mar 2020 15:36:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585236999; 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=/8wyeUj06KXeS38TLcF04SKwHtzws1PB37ZwA+U4vxc=; b=TbbAxGUnv74qSx9Kwo1eEg4JTcy4dUZnRvkjDAo4prnUu0IwOfvJnmnzUuTMD2mDPAZ8s1 KPdTYWWbRb7YtQcqj27qWyWdc5W3s3XN6kMh38J5cPGmq7C2Cec9VDzks+WRLgTAXzdSYr d2dGL0dQ2AOdwVzW7S5x7lfB8RvzXY8= X-MC-Unique: NJixbO6bMdeyNjBOvkuDZw-1 From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH v2 1/2] Revert "mirror: Don't let an operation wait for itself" Date: Thu, 26 Mar 2020 16:36:27 +0100 Message-Id: <20200326153628.4869-2-kwolf@redhat.com> In-Reply-To: <20200326153628.4869-1-kwolf@redhat.com> References: <20200326153628.4869-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 63.128.21.74 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: kwolf@redhat.com, jsnow@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" This reverts commit 7e6c4ff792734e196c8ca82564c56b5e7c6288ca. The fix was incomplete as it only protected against requests waiting for themselves, but not against requests waiting for each other. We need a different solution. Signed-off-by: Kevin Wolf --- block/mirror.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) diff --git a/block/mirror.c b/block/mirror.c index 447051dbc6..393131b135 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -283,14 +283,11 @@ static int mirror_cow_align(MirrorBlockJob *s, int64_= t *offset, } =20 static inline void coroutine_fn -mirror_wait_for_any_operation(MirrorBlockJob *s, MirrorOp *self, bool acti= ve) +mirror_wait_for_any_operation(MirrorBlockJob *s, bool active) { MirrorOp *op; =20 QTAILQ_FOREACH(op, &s->ops_in_flight, next) { - if (self =3D=3D op) { - continue; - } /* Do not wait on pseudo ops, because it may in turn wait on * some other operation to start, which may in fact be the * caller of this function. Since there is only one pseudo op @@ -305,10 +302,10 @@ mirror_wait_for_any_operation(MirrorBlockJob *s, Mirr= orOp *self, bool active) } =20 static inline void coroutine_fn -mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s, MirrorOp *self) +mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s) { /* Only non-active operations use up in-flight slots */ - mirror_wait_for_any_operation(s, self, false); + mirror_wait_for_any_operation(s, false); } =20 /* Perform a mirror copy operation. @@ -351,7 +348,7 @@ static void coroutine_fn mirror_co_read(void *opaque) =20 while (s->buf_free_count < nb_chunks) { trace_mirror_yield_in_flight(s, op->offset, s->in_flight); - mirror_wait_for_free_in_flight_slot(s, op); + mirror_wait_for_free_in_flight_slot(s); } =20 /* Now make a QEMUIOVector taking enough granularity-sized chunks @@ -558,7 +555,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlo= ckJob *s) =20 while (s->in_flight >=3D MAX_IN_FLIGHT) { trace_mirror_yield_in_flight(s, offset, s->in_flight); - mirror_wait_for_free_in_flight_slot(s, pseudo_op); + mirror_wait_for_free_in_flight_slot(s); } =20 if (s->ret < 0) { @@ -612,7 +609,7 @@ static void mirror_free_init(MirrorBlockJob *s) static void coroutine_fn mirror_wait_for_all_io(MirrorBlockJob *s) { while (s->in_flight > 0) { - mirror_wait_for_free_in_flight_slot(s, NULL); + mirror_wait_for_free_in_flight_slot(s); } } =20 @@ -809,7 +806,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJo= b *s) if (s->in_flight >=3D MAX_IN_FLIGHT) { trace_mirror_yield(s, UINT64_MAX, s->buf_free_count, s->in_flight); - mirror_wait_for_free_in_flight_slot(s, NULL); + mirror_wait_for_free_in_flight_slot(s); continue; } =20 @@ -962,7 +959,7 @@ static int coroutine_fn mirror_run(Job *job, Error **er= rp) /* Do not start passive operations while there are active * writes in progress */ while (s->in_active_write_counter) { - mirror_wait_for_any_operation(s, NULL, true); + mirror_wait_for_any_operation(s, true); } =20 if (s->ret < 0) { @@ -988,7 +985,7 @@ static int coroutine_fn mirror_run(Job *job, Error **er= rp) if (s->in_flight >=3D MAX_IN_FLIGHT || s->buf_free_count =3D= =3D 0 || (cnt =3D=3D 0 && s->in_flight > 0)) { trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight= ); - mirror_wait_for_free_in_flight_slot(s, NULL); + mirror_wait_for_free_in_flight_slot(s); continue; } else if (cnt !=3D 0) { delay_ns =3D mirror_iteration(s); --=20 2.20.1