From patchwork Fri May 7 15:11:59 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: 12244869 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 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 AD7E1C433B4 for ; Fri, 7 May 2021 15:13:46 +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 DC4B6613C0 for ; Fri, 7 May 2021 15:13:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DC4B6613C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38192 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lf2Ai-00005c-TZ for qemu-devel@archiver.kernel.org; Fri, 07 May 2021 11:13:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45784) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lf29G-0006ym-TP for qemu-devel@nongnu.org; Fri, 07 May 2021 11:12:14 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:58498) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lf29F-0001ma-9T for qemu-devel@nongnu.org; Fri, 07 May 2021 11:12:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1620400332; 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=fV20J4Btohsbn/Q0xrXXA6gW+0ZKKcirbJd1bz20viM=; b=PY303OL9XNe+xYmqAgD6JxZR27t2Pw7hnqFzBNMvholFtHxpZR0IK3P1mtmNcoRHuvhcjd p7squ28vhGZgH0CTGLqWQv1RruNGD7FJbYd5y0l3IZ8nB6GAOR43Zd4rQqhiN53yb7Wn3i hDZkUWR9EkUU3KhJmV4ig6npY974PWU= 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-502-oECL7K3RO3iwiNXTpiaNnw-1; Fri, 07 May 2021 11:12:10 -0400 X-MC-Unique: oECL7K3RO3iwiNXTpiaNnw-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ADDD41898297; Fri, 7 May 2021 15:12:08 +0000 (UTC) Received: from localhost.localdomain (ovpn-113-137.ams2.redhat.com [10.36.113.137]) by smtp.corp.redhat.com (Postfix) with ESMTP id B4C1C5D9CC; Fri, 7 May 2021 15:12:06 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Subject: [PATCH v2 1/5] blkdebug: refactor removal of a suspended request Date: Fri, 7 May 2021 17:11:59 +0200 Message-Id: <20210507151203.39643-2-eesposit@redhat.com> In-Reply-To: <20210507151203.39643-1-eesposit@redhat.com> References: <20210507151203.39643-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, 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=unavailable 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 , Paolo Bonzini , Emanuele Giuseppe Esposito , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Extract to a separate function. Do not rely on FOREACH_SAFE, which is only "safe" if the *current* node is removed---not if another node is removed. Instead, just walk the entire list from the beginning when asked to resume all suspended requests with a given tag. Co-developed-by: Paolo Bonzini Signed-off-by: Emanuele Giuseppe Esposito --- block/blkdebug.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) diff --git a/block/blkdebug.c b/block/blkdebug.c index 2c0b9b0ee8..8f19d991fa 100644 --- a/block/blkdebug.c +++ b/block/blkdebug.c @@ -793,7 +793,6 @@ static void suspend_request(BlockDriverState *bs, BlkdebugRule *rule) printf("blkdebug: Resuming request '%s'\n", r.tag); } - QLIST_REMOVE(&r, next); g_free(r.tag); } @@ -869,25 +868,35 @@ static int blkdebug_debug_breakpoint(BlockDriverState *bs, const char *event, return 0; } -static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag) +static int resume_req_by_tag(BDRVBlkdebugState *s, const char *tag, bool all) { - BDRVBlkdebugState *s = bs->opaque; - BlkdebugSuspendedReq *r, *next; + BlkdebugSuspendedReq *r; - QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, next) { +retry: + QLIST_FOREACH(r, &s->suspended_reqs, next) { if (!strcmp(r->tag, tag)) { + QLIST_REMOVE(r, next); qemu_coroutine_enter(r->co); + if (all) { + goto retry; + } return 0; } } return -ENOENT; } +static int blkdebug_debug_resume(BlockDriverState *bs, const char *tag) +{ + BDRVBlkdebugState *s = bs->opaque; + + return resume_req_by_tag(s, tag, false); +} + static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) { BDRVBlkdebugState *s = bs->opaque; - BlkdebugSuspendedReq *r, *r_next; BlkdebugRule *rule, *next; int i, ret = -ENOENT; @@ -900,11 +909,8 @@ static int blkdebug_debug_remove_breakpoint(BlockDriverState *bs, } } } - QLIST_FOREACH_SAFE(r, &s->suspended_reqs, next, r_next) { - if (!strcmp(r->tag, tag)) { - qemu_coroutine_enter(r->co); - ret = 0; - } + if (resume_req_by_tag(s, tag, true) == 0) { + ret = 0; } return ret; }