From patchwork Mon May 17 14:50:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 1479584 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=MMv+vrmM; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4FkMc22xkLz9sWp for ; Tue, 18 May 2021 00:54:42 +1000 (AEST) Received: from localhost ([::1]:47722 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1liedk-00082W-FI for incoming@patchwork.ozlabs.org; Mon, 17 May 2021 10:54:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34560) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lieaF-0001Xk-Cl for qemu-devel@nongnu.org; Mon, 17 May 2021 10:51:03 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:29737) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lieaD-0004fX-I5 for qemu-devel@nongnu.org; Mon, 17 May 2021 10:51:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621263060; 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=ICrrjGgia8w1NaBy1XQD706S9/jMkYW2Mr1MjkqN/bs=; b=MMv+vrmMxXsCZwK7m34oMPupEylenYi+xvRlbn4onlGknR0gePifnLa/e+zJerlp12vt8y dFD1mrKaXbO50atNYN7IqH3BGqp0XzEtQiUc/rwlk3rZqdWTrqJkpghLeC9IhzshsiNcYQ 8AHHYfQwV+k5btNhhnvVa6FPAblOq9A= 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-372-OWp_ukHTNpKDEKcGlyIhnA-1; Mon, 17 May 2021 10:50:59 -0400 X-MC-Unique: OWp_ukHTNpKDEKcGlyIhnA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6DAEA192377A; Mon, 17 May 2021 14:50:58 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-113-23.ams2.redhat.com [10.36.113.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 98B015D749; Mon, 17 May 2021 14:50:56 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Subject: [PATCH v3 2/5] blkdebug: move post-resume handling to resume_req_by_tag Date: Mon, 17 May 2021 16:50:46 +0200 Message-Id: <20210517145049.55268-3-eesposit@redhat.com> In-Reply-To: <20210517145049.55268-1-eesposit@redhat.com> References: <20210517145049.55268-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eesposit@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=eesposit@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=-0.374, 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_H4=0.001, RCVD_IN_MSPIKE_WL=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 , Emanuele Giuseppe Esposito , qemu-devel@nongnu.org, Max Reitz , Paolo Bonzini Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" We want to move qemu_coroutine_yield() after the loop on rules, because QLIST_FOREACH_SAFE is wrong if the rule list is modified while the coroutine has yielded. Therefore move the suspended request to the heap and clean it up from the remove side. All that is left is for blkdebug_debug_event to handle the yielding. Co-developed-by: Paolo Bonzini Signed-off-by: Emanuele Giuseppe Esposito Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/blkdebug.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) diff --git a/block/blkdebug.c b/block/blkdebug.c index 8f19d991fa..e37f999254 100644 --- a/block/blkdebug.c +++ b/block/blkdebug.c @@ -775,25 +775,20 @@ static void blkdebug_close(BlockDriverState *bs) static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule) { BDRVBlkdebugState *s = bs->opaque; - BlkdebugSuspendedReq r; + BlkdebugSuspendedReq *r; - r = (BlkdebugSuspendedReq) { - .co = qemu_coroutine_self(), - .tag = g_strdup(rule->options.suspend.tag), - }; + r = g_new(BlkdebugSuspendedReq, 1); + + r->co = qemu_coroutine_self(); + r->tag = g_strdup(rule->options.suspend.tag); remove_rule(rule); - QLIST_INSERT_HEAD(&s->suspended_reqs, &r, next); + QLIST_INSERT_HEAD(&s->suspended_reqs, r, next); if (!qtest_enabled()) { - printf("blkdebug: Suspended request '%s'\n", r.tag); + printf("blkdebug: Suspended request '%s'\n", r->tag); } qemu_coroutine_yield(); - if (!qtest_enabled()) { - printf("blkdebug: Resuming request '%s'\n", r.tag); - } - - g_free(r.tag); } static bool process_rule(BlockDriverState *bs, struct BlkdebugRule *rule, @@ -875,8 +870,18 @@ static int resume_req_by_tag(BDRVBlkdebugState *s, const char *tag, bool all) retry: QLIST_FOREACH(r, &s->suspended_reqs, next) { if (!strcmp(r->tag, tag)) { + Coroutine *co = r->co; + + if (!qtest_enabled()) { + printf("blkdebug: Resuming request '%s'\n", r->tag); + } + QLIST_REMOVE(r, next); - qemu_coroutine_enter(r->co); + g_free(r->tag); + g_free(r); + + qemu_coroutine_enter(co); + if (all) { goto retry; }