From patchwork Wed Oct 21 16:26:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= X-Patchwork-Id: 302373 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=-9.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,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 A24E8C388F9 for ; Wed, 21 Oct 2020 16:33:37 +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 223BE20872 for ; Wed, 21 Oct 2020 16:33:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="HDyN0D+9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 223BE20872 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]:41756 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kVH3Q-0007SU-3J for qemu-devel@archiver.kernel.org; Wed, 21 Oct 2020 12:33:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59294) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kVGxU-00025J-P3 for qemu-devel@nongnu.org; Wed, 21 Oct 2020 12:27:28 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:51028) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kVGxS-0004sN-Ux for qemu-devel@nongnu.org; Wed, 21 Oct 2020 12:27:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603297646; 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=oO/Tdfe1cH8tpz9PBor6zbjoq6WOwhe+J0YqSmlJbQ0=; b=HDyN0D+9lDa5Y5CvFnowhqhU2rrH3M5GCXohfaFtjbxn5RJ+R1xG/lomaQBqkMWVRxZAbm fQ0sETpAf+7phcbhr7XCqj3PDQPTNfdnOFq0gCpw1SpkwpyQJFkBpKaAcLeWkOgfpc6gc2 nH+dfrcWMzcXyGm2H3xVrwP70z5+elg= 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-11-jJHaGxqMO5mCO0r2KkEvYQ-1; Wed, 21 Oct 2020 12:27:24 -0400 X-MC-Unique: jJHaGxqMO5mCO0r2KkEvYQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3AF361074659; Wed, 21 Oct 2020 16:27:23 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.19]) by smtp.corp.redhat.com (Postfix) with ESMTP id 01A8810013C1; Wed, 21 Oct 2020 16:27:18 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v7 03/11] migration: stop returning errno from load_snapshot() Date: Wed, 21 Oct 2020 17:26:56 +0100 Message-Id: <20201021162704.3652555-4-berrange@redhat.com> In-Reply-To: <20201021162704.3652555-1-berrange@redhat.com> References: <20201021162704.3652555-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/21 02:16:02 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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 , Peter Krempa , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , "Denis V. Lunev" , qemu-block@nongnu.org, Juan Quintela , John Snow , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , "Dr. David Alan Gilbert" , Max Reitz , Pavel Dovgalyuk , Pavel Dovgalyuk , Paolo Bonzini , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" None of the callers care about the errno value since there is a full Error object populated. This gives consistency with save_snapshot() which already just returns a boolean value. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Daniel P. Berrangé [PMD: Return false/true instead of -1/0, document function] Acked-by: Pavel Dovgalyuk Signed-off-by: Philippe Mathieu-Daudé --- include/migration/snapshot.h | 10 +++++++++- migration/savevm.c | 19 +++++++++---------- monitor/hmp-cmds.c | 2 +- replay/replay-snapshot.c | 2 +- softmmu/vl.c | 2 +- 5 files changed, 21 insertions(+), 14 deletions(-) diff --git a/include/migration/snapshot.h b/include/migration/snapshot.h index 0eaf1ba0b1..d7d210820c 100644 --- a/include/migration/snapshot.h +++ b/include/migration/snapshot.h @@ -23,6 +23,14 @@ * 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); + +/** + * load_snapshot: Load 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 load_snapshot(const char *name, Error **errp); #endif diff --git a/migration/savevm.c b/migration/savevm.c index fd2e5e8b66..531bb2eca1 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2864,7 +2864,7 @@ void qmp_xen_load_devices_state(const char *filename, Error **errp) migration_incoming_state_destroy(); } -int load_snapshot(const char *name, Error **errp) +bool load_snapshot(const char *name, Error **errp) { BlockDriverState *bs_vm_state; QEMUSnapshotInfo sn; @@ -2874,16 +2874,16 @@ int load_snapshot(const char *name, Error **errp) MigrationIncomingState *mis = migration_incoming_get_current(); if (!bdrv_all_can_snapshot(errp)) { - return -ENOTSUP; + return false; } ret = bdrv_all_find_snapshot(name, errp); if (ret < 0) { - return ret; + return false; } bs_vm_state = bdrv_all_find_vmstate_bs(errp); if (!bs_vm_state) { - return -ENOTSUP; + return false; } aio_context = bdrv_get_aio_context(bs_vm_state); @@ -2892,11 +2892,11 @@ int load_snapshot(const char *name, Error **errp) ret = bdrv_snapshot_find(bs_vm_state, &sn, name); aio_context_release(aio_context); if (ret < 0) { - return ret; + return false; } else if (sn.vm_state_size == 0) { error_setg(errp, "This is a disk-only snapshot. Revert to it " " offline using qemu-img"); - return -EINVAL; + return false; } /* @@ -2917,7 +2917,6 @@ int load_snapshot(const char *name, Error **errp) f = qemu_fopen_bdrv(bs_vm_state, 0); if (!f) { error_setg(errp, "Could not open VM state file"); - ret = -EINVAL; goto err_drain; } @@ -2933,14 +2932,14 @@ int load_snapshot(const char *name, Error **errp) if (ret < 0) { error_setg(errp, "Error %d while loading VM state", ret); - return ret; + return false; } - return 0; + return true; err_drain: bdrv_drain_all_end(); - return ret; + return false; } void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev) diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index f48173820f..521fcf96eb 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -1123,7 +1123,7 @@ void hmp_loadvm(Monitor *mon, const QDict *qdict) vm_stop(RUN_STATE_RESTORE_VM); - if (load_snapshot(name, &err) == 0 && saved_vm_running) { + if (!load_snapshot(name, &err) && saved_vm_running) { vm_start(); } hmp_handle_error(mon, err); diff --git a/replay/replay-snapshot.c b/replay/replay-snapshot.c index 4f2560d156..b289365937 100644 --- a/replay/replay-snapshot.c +++ b/replay/replay-snapshot.c @@ -83,7 +83,7 @@ void replay_vmstate_init(void) exit(1); } } else if (replay_mode == REPLAY_MODE_PLAY) { - if (load_snapshot(replay_snapshot, &err) != 0) { + if (!load_snapshot(replay_snapshot, &err)) { error_report_err(err); error_report("Could not load snapshot for icount replay"); exit(1); diff --git a/softmmu/vl.c b/softmmu/vl.c index cb476aa70b..495a980db0 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -4484,7 +4484,7 @@ void qemu_init(int argc, char **argv, char **envp) register_global_state(); if (loadvm) { Error *local_err = NULL; - if (load_snapshot(loadvm, &local_err) < 0) { + if (!load_snapshot(loadvm, &local_err)) { error_report_err(local_err); autostart = 0; exit(1);