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=-15.1 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,USER_AGENT_SANE_1 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 B20CFC433DB for ; Mon, 25 Jan 2021 16:43:55 +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 54CF922795 for ; Mon, 25 Jan 2021 16:43:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 54CF922795 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]:33678 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l44y2-0000dJ-HL for qemu-devel@archiver.kernel.org; Mon, 25 Jan 2021 11:43:54 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:48730) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l44wE-0007cL-1K for qemu-devel@nongnu.org; Mon, 25 Jan 2021 11:42:02 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:40478) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1l44wB-0002CU-PP for qemu-devel@nongnu.org; Mon, 25 Jan 2021 11:42:01 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611592919; 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=dKaKuvFTiS9+2ySO3L8kehnHSDk2qIJJBFd8MhI8yik=; b=YDDEmkMIOCw0LZRcLk11DZiqi3chhsRh3VOO3pW8YNCxL3hQQtqQQR/MTGlVXLxqNYQq9V A/f9S0BKKgcfCopzZAbgeY/ClDrkv/9CRYf8Oa44WSOanTsWKwuQiBADWfArA7mG5t5yqX hhKhpVVNDy5K1ZQ0YpLEX6A8szQU8uY= 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-321-T5Y-vKnoPuy0RjsnNiC1Nw-1; Mon, 25 Jan 2021 11:41:57 -0500 X-MC-Unique: T5Y-vKnoPuy0RjsnNiC1Nw-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 6B2C710051BB; Mon, 25 Jan 2021 16:41:56 +0000 (UTC) Received: from work-vm (ovpn-114-3.ams2.redhat.com [10.36.114.3]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DAB6E5D9E2; Mon, 25 Jan 2021 16:41:30 +0000 (UTC) Date: Mon, 25 Jan 2021 16:41:28 +0000 From: "Dr. David Alan Gilbert" To: Daniel =?iso-8859-1?Q?P=2E_Berrang=E9?= Subject: Re: [PATCH v9 02/11] migration: Make save_snapshot() return bool, not 0/-1 Message-ID: <20210125164128.GM2925@work-vm> References: <20210120104411.3084801-1-berrange@redhat.com> <20210120104411.3084801-3-berrange@redhat.com> MIME-Version: 1.0 In-Reply-To: <20210120104411.3084801-3-berrange@redhat.com> User-Agent: Mutt/1.14.6 (2020-07-11) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dgilbert@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=dgilbert@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.255, 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_H3=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 , Pavel Dovgalyuk , qemu-block@nongnu.org, Juan Quintela , John Snow , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= , qemu-devel@nongnu.org, Markus Armbruster , Pavel Dovgalyuk , Paolo Bonzini , Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Daniel P. Berrangé (berrange@redhat.com) wrote: > From: Philippe Mathieu-Daudé > > Just for consistency, following the example documented since > commit e3fe3988d7 ("error: Document Error API usage rules"), > return a boolean value indicating an error is set or not. > > Acked-by: Pavel Dovgalyuk > Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Dr. David Alan Gilbert > --- > include/migration/snapshot.h | 9 ++++++++- > migration/savevm.c | 16 ++++++++-------- > replay/replay-debugging.c | 2 +- > replay/replay-snapshot.c | 2 +- > 4 files changed, 18 insertions(+), 11 deletions(-) > > diff --git a/include/migration/snapshot.h b/include/migration/snapshot.h > index c85b6ec75b..0eaf1ba0b1 100644 > --- a/include/migration/snapshot.h > +++ b/include/migration/snapshot.h > @@ -15,7 +15,14 @@ > #ifndef QEMU_MIGRATION_SNAPSHOT_H > #define QEMU_MIGRATION_SNAPSHOT_H > > -int save_snapshot(const char *name, Error **errp); > +/** > + * save_snapshot: Save an internal snapshot. > + * @name: name of internal snapshot > + * @errp: pointer to error object > + * On success, return %true. > + * On failure, store an error through @errp and return %false. > + */ > +bool save_snapshot(const char *name, Error **errp); > int load_snapshot(const char *name, Error **errp); > > #endif > diff --git a/migration/savevm.c b/migration/savevm.c > index 4a7237337e..ef7963f6c9 100644 > --- a/migration/savevm.c > +++ b/migration/savevm.c > @@ -2729,7 +2729,7 @@ int qemu_load_device_state(QEMUFile *f) > return 0; > } > > -int save_snapshot(const char *name, Error **errp) > +bool save_snapshot(const char *name, Error **errp) > { > BlockDriverState *bs; > QEMUSnapshotInfo sn1, *sn = &sn1; > @@ -2742,29 +2742,29 @@ int save_snapshot(const char *name, Error **errp) > AioContext *aio_context; > > if (migration_is_blocked(errp)) { > - return ret; > + return false; > } > > if (!replay_can_snapshot()) { > error_setg(errp, "Record/replay does not allow making snapshot " > "right now. Try once more later."); > - return ret; > + return false; > } > > if (!bdrv_all_can_snapshot(errp)) { > - return ret; > + return false; > } > > /* Delete old snapshots of the same name */ > if (name) { > if (bdrv_all_delete_snapshot(name, errp) < 0) { > - return ret; > + return false; > } > } > > bs = bdrv_all_find_vmstate_bs(errp); > if (bs == NULL) { > - return ret; > + return false; > } > aio_context = bdrv_get_aio_context(bs); > > @@ -2773,7 +2773,7 @@ int save_snapshot(const char *name, Error **errp) > ret = global_state_store(); > if (ret) { > error_setg(errp, "Error saving global state"); > - return ret; > + return false; > } > vm_stop(RUN_STATE_SAVE_VM); > > @@ -2845,7 +2845,7 @@ int save_snapshot(const char *name, Error **errp) > if (saved_vm_running) { > vm_start(); > } > - return ret; > + return ret == 0; > } > > void qmp_xen_save_devices_state(const char *filename, bool has_live, bool live, > diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c > index 3a9b609e62..8e0050915d 100644 > --- a/replay/replay-debugging.c > +++ b/replay/replay-debugging.c > @@ -323,7 +323,7 @@ void replay_gdb_attached(void) > */ > if (replay_mode == REPLAY_MODE_PLAY > && !replay_snapshot) { > - if (save_snapshot("start_debugging", NULL) != 0) { > + if (!save_snapshot("start_debugging", NULL)) { > /* Can't create the snapshot. Continue conventional debugging. */ > } > } > diff --git a/replay/replay-snapshot.c b/replay/replay-snapshot.c > index e26fa4c892..4f2560d156 100644 > --- a/replay/replay-snapshot.c > +++ b/replay/replay-snapshot.c > @@ -77,7 +77,7 @@ void replay_vmstate_init(void) > > if (replay_snapshot) { > if (replay_mode == REPLAY_MODE_RECORD) { > - if (save_snapshot(replay_snapshot, &err) != 0) { > + if (!save_snapshot(replay_snapshot, &err)) { > error_report_err(err); > error_report("Could not create snapshot for icount record"); > exit(1); > -- > 2.29.2 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK