From patchwork Thu Oct 8 15:49:54 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: 303430 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 76044C4363C for ; Thu, 8 Oct 2020 15:52:40 +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 D4B482087D for ; Thu, 8 Oct 2020 15:52:39 +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="ZS/MNLja" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D4B482087D 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]:43208 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kQYDe-0008PW-RI for qemu-devel@archiver.kernel.org; Thu, 08 Oct 2020 11:52:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58406) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kQYBd-0006Z9-2J for qemu-devel@nongnu.org; Thu, 08 Oct 2020 11:50:33 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:21956) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kQYBa-0002b6-Cn for qemu-devel@nongnu.org; Thu, 08 Oct 2020 11:50:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602172227; 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=W8nF0INCjumOuHpy7REtxvUeNk+vkD2Xh/N2quph/z0=; b=ZS/MNLjabeDgVphSProXDRJVdWH8bL/iSEG3ipnaq/H80SPkb+64NPI1bwnWFhYsxh5ClH S1D+OrieP9FIzaYMMVcu5bpwzPZYEZWduG0zWJCEuX0NXiSUX/j3p6PU3DVGvvipIfldR3 9kxCbF+8NTkGxNJTP5cn+rh54d51j/Q= 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-48-huo1bH-iOAuF31rzZoNF3w-1; Thu, 08 Oct 2020 11:50:25 -0400 X-MC-Unique: huo1bH-iOAuF31rzZoNF3w-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 93D8510AB002; Thu, 8 Oct 2020 15:50:18 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.110.13]) by smtp.corp.redhat.com (Postfix) with ESMTP id C9A715C1BD; Thu, 8 Oct 2020 15:50:14 +0000 (UTC) From: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v6 03/10] block: add ability to specify list of blockdevs during snapshot Date: Thu, 8 Oct 2020 16:49:54 +0100 Message-Id: <20201008155001.3357288-4-berrange@redhat.com> In-Reply-To: <20201008155001.3357288-1-berrange@redhat.com> References: <20201008155001.3357288-1-berrange@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 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=63.128.21.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/08 01:56:49 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_H5=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 , Markus Armbruster , Max Reitz , Pavel Dovgalyuk , Paolo Bonzini , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" When running snapshot operations, there are various rules for which blockdevs are included/excluded. While this provides reasonable default behaviour, there are scenarios that are not well handled by the default logic. Some of the conditions do not have a single correct answer. Thus there needs to be a way for the mgmt app to provide an explicit list of blockdevs to perform snapshots across. This can be achieved by passing a list of node names that should be used. Signed-off-by: Daniel P. Berrangé Reviewed-by: Eric Blake --- block/monitor/block-hmp-cmds.c | 4 +- block/snapshot.c | 180 ++++++++++++++++++++++++--------- include/block/snapshot.h | 22 ++-- migration/savevm.c | 16 +-- monitor/hmp-cmds.c | 2 +- replay/replay-debugging.c | 4 +- 6 files changed, 162 insertions(+), 66 deletions(-) diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c index 548bb6b5e3..ebb6ae0333 100644 --- a/block/monitor/block-hmp-cmds.c +++ b/block/monitor/block-hmp-cmds.c @@ -901,7 +901,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict) SnapshotEntry *snapshot_entry; Error *err = NULL; - bs = bdrv_all_find_vmstate_bs(&err); + bs = bdrv_all_find_vmstate_bs(false, NULL, &err); if (!bs) { error_report_err(err); return; @@ -953,7 +953,7 @@ void hmp_info_snapshots(Monitor *mon, const QDict *qdict) total = 0; for (i = 0; i < nb_sns; i++) { SnapshotEntry *next_sn; - if (bdrv_all_find_snapshot(sn_tab[i].name, NULL) == 0) { + if (bdrv_all_find_snapshot(sn_tab[i].name, false, NULL, NULL) == 0) { global_snapshots[total] = i; total++; QTAILQ_FOREACH(image_entry, &image_list, next) { diff --git a/block/snapshot.c b/block/snapshot.c index 50e35bb9fa..155b8aad88 100644 --- a/block/snapshot.c +++ b/block/snapshot.c @@ -447,6 +447,41 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, return ret; } + +static int bdrv_all_get_snapshot_devices(bool has_devices, strList *devices, + GList **all_bdrvs, + Error **errp) +{ + g_autoptr(GList) bdrvs = NULL; + + if (has_devices) { + if (!devices) { + error_setg(errp, "At least one device is required for snapshot"); + return -1; + } + + while (devices) { + BlockDriverState *bs = bdrv_find_node(devices->value); + if (!bs) { + error_setg(errp, "No block device node '%s'", devices->value); + return -1; + } + bdrvs = g_list_append(bdrvs, bs); + devices = devices->next; + } + } else { + BlockDriverState *bs; + BdrvNextIterator it; + for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + bdrvs = g_list_append(bdrvs, bs); + } + } + + *all_bdrvs = g_steal_pointer(&bdrvs); + return 0; +} + + static bool bdrv_all_snapshots_includes_bs(BlockDriverState *bs) { if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { @@ -462,43 +497,59 @@ static bool bdrv_all_snapshots_includes_bs(BlockDriverState *bs) * These functions will properly handle dataplane (take aio_context_acquire * when appropriate for appropriate block drivers) */ -bool bdrv_all_can_snapshot(Error **errp) +bool bdrv_all_can_snapshot(bool has_devices, strList *devices, + Error **errp) { - BlockDriverState *bs; - BdrvNextIterator it; + g_autoptr(GList) bdrvs = NULL; + GList *iterbdrvs; - for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { + return false; + } + + iterbdrvs = bdrvs; + while (iterbdrvs) { + BlockDriverState *bs = iterbdrvs->data; AioContext *ctx = bdrv_get_aio_context(bs); bool ok; aio_context_acquire(ctx); - if (bdrv_all_snapshots_includes_bs(bs)) { + if (devices || bdrv_all_snapshots_includes_bs(bs)) { ok = bdrv_can_snapshot(bs); } aio_context_release(ctx); if (!ok) { error_setg(errp, "Device '%s' is writable but does not support " "snapshots", bdrv_get_device_or_node_name(bs)); - bdrv_next_cleanup(&it); return false; } + + iterbdrvs = iterbdrvs->next; } return true; } -int bdrv_all_delete_snapshot(const char *name, Error **errp) +int bdrv_all_delete_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp) { - BlockDriverState *bs; - BdrvNextIterator it; - QEMUSnapshotInfo sn1, *snapshot = &sn1; + g_autoptr(GList) bdrvs = NULL; + GList *iterbdrvs; + + if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { + return -1; + } - for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + iterbdrvs = bdrvs; + while (iterbdrvs) { + BlockDriverState *bs = iterbdrvs->data; AioContext *ctx = bdrv_get_aio_context(bs); - int ret; + QEMUSnapshotInfo sn1, *snapshot = &sn1; + int ret = 0; aio_context_acquire(ctx); - if (bdrv_all_snapshots_includes_bs(bs) && + if ((devices || bdrv_all_snapshots_includes_bs(bs)) && bdrv_snapshot_find(bs, snapshot, name) >= 0) { ret = bdrv_snapshot_delete(bs, snapshot->id_str, @@ -508,61 +559,80 @@ int bdrv_all_delete_snapshot(const char *name, Error **errp) if (ret < 0) { error_prepend(errp, "Could not delete snapshot '%s' on '%s': ", name, bdrv_get_device_or_node_name(bs)); - bdrv_next_cleanup(&it); return -1; } + + iterbdrvs = iterbdrvs->next; } return 0; } -int bdrv_all_goto_snapshot(const char *name, Error **errp) +int bdrv_all_goto_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp) { - BlockDriverState *bs; - BdrvNextIterator it; + g_autoptr(GList) bdrvs = NULL; + GList *iterbdrvs; - for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { + return -1; + } + + iterbdrvs = bdrvs; + while (iterbdrvs) { + BlockDriverState *bs = iterbdrvs->data; AioContext *ctx = bdrv_get_aio_context(bs); - int ret; + int ret = 0; aio_context_acquire(ctx); - if (bdrv_all_snapshots_includes_bs(bs)) { + if (devices || bdrv_all_snapshots_includes_bs(bs)) { ret = bdrv_snapshot_goto(bs, name, errp); } aio_context_release(ctx); if (ret < 0) { error_prepend(errp, "Could not load snapshot '%s' on '%s': ", name, bdrv_get_device_or_node_name(bs)); - bdrv_next_cleanup(&it); return -1; } + + iterbdrvs = iterbdrvs->next; } return 0; } -int bdrv_all_find_snapshot(const char *name, Error **errp) +int bdrv_all_find_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp) { - QEMUSnapshotInfo sn; - BlockDriverState *bs; - BdrvNextIterator it; + g_autoptr(GList) bdrvs = NULL; + GList *iterbdrvs; + + if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { + return -1; + } - for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + iterbdrvs = bdrvs; + while (iterbdrvs) { + BlockDriverState *bs = iterbdrvs->data; AioContext *ctx = bdrv_get_aio_context(bs); - int ret; + QEMUSnapshotInfo sn; + int ret = 0; aio_context_acquire(ctx); - if (bdrv_all_snapshots_includes_bs(bs)) { + if (devices || bdrv_all_snapshots_includes_bs(bs)) { ret = bdrv_snapshot_find(bs, &sn, name); } aio_context_release(ctx); if (ret < 0) { error_setg(errp, "Could not find snapshot '%s' on '%s'", name, bdrv_get_device_or_node_name(bs)); - bdrv_next_cleanup(&it); return -1; } + + iterbdrvs = iterbdrvs->next; } return 0; @@ -571,20 +641,27 @@ int bdrv_all_find_snapshot(const char *name, Error **errp) int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState *vm_state_bs, uint64_t vm_state_size, + bool has_devices, strList *devices, Error **errp) { - BlockDriverState *bs; - BdrvNextIterator it; + g_autoptr(GList) bdrvs = NULL; + GList *iterbdrvs; + + if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { + return -1; + } - for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + iterbdrvs = bdrvs; + while (iterbdrvs) { + BlockDriverState *bs = iterbdrvs->data; AioContext *ctx = bdrv_get_aio_context(bs); - int ret; + int ret = 0; aio_context_acquire(ctx); if (bs == vm_state_bs) { sn->vm_state_size = vm_state_size; ret = bdrv_snapshot_create(bs, sn); - } else if (bdrv_all_snapshots_includes_bs(bs)) { + } else if (devices || bdrv_all_snapshots_includes_bs(bs)) { sn->vm_state_size = 0; ret = bdrv_snapshot_create(bs, sn); } @@ -592,34 +669,43 @@ int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, if (ret < 0) { error_setg(errp, "Could not create snapshot '%s' on '%s'", sn->name, bdrv_get_device_or_node_name(bs)); - bdrv_next_cleanup(&it); return -1; } + + iterbdrvs = iterbdrvs->next; } return 0; } -BlockDriverState *bdrv_all_find_vmstate_bs(Error **errp) +BlockDriverState *bdrv_all_find_vmstate_bs(bool has_devices, strList *devices, + Error **errp) { - BlockDriverState *bs; - BdrvNextIterator it; + g_autoptr(GList) bdrvs = NULL; + GList *iterbdrvs; - for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { + if (bdrv_all_get_snapshot_devices(has_devices, devices, &bdrvs, errp) < 0) { + return NULL; + } + + iterbdrvs = bdrvs; + while (iterbdrvs) { + BlockDriverState *bs = iterbdrvs->data; AioContext *ctx = bdrv_get_aio_context(bs); - bool found; + bool found = false; aio_context_acquire(ctx); - found = bdrv_all_snapshots_includes_bs(bs) && bdrv_can_snapshot(bs); + found = (devices || bdrv_all_snapshots_includes_bs(bs)) && + bdrv_can_snapshot(bs); aio_context_release(ctx); if (found) { - bdrv_next_cleanup(&it); - break; + return bs; } + + iterbdrvs = iterbdrvs->next; } - if (!bs) { - error_setg(errp, "No block device supports snapshots"); - } - return bs; + + error_setg(errp, "No block device supports snapshots"); + return NULL; } diff --git a/include/block/snapshot.h b/include/block/snapshot.h index 5cb2b696ad..2569a903f2 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -25,7 +25,7 @@ #ifndef SNAPSHOT_H #define SNAPSHOT_H - +#include "qapi/qapi-builtin-types.h" #define SNAPSHOT_OPT_BASE "snapshot." #define SNAPSHOT_OPT_ID "snapshot.id" @@ -77,15 +77,25 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs, * These functions will properly handle dataplane (take aio_context_acquire * when appropriate for appropriate block drivers */ -bool bdrv_all_can_snapshot(Error **errp); -int bdrv_all_delete_snapshot(const char *name, Error **errp); -int bdrv_all_goto_snapshot(const char *name, Error **errp); -int bdrv_all_find_snapshot(const char *name, Error **errp); +bool bdrv_all_can_snapshot(bool has_devices, strList *devices, + Error **errp); +int bdrv_all_delete_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp); +int bdrv_all_goto_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp); +int bdrv_all_find_snapshot(const char *name, + bool has_devices, strList *devices, + Error **errp); int bdrv_all_create_snapshot(QEMUSnapshotInfo *sn, BlockDriverState *vm_state_bs, uint64_t vm_state_size, + bool has_devices, + strList *devices, Error **errp); -BlockDriverState *bdrv_all_find_vmstate_bs(Error **errp); +BlockDriverState *bdrv_all_find_vmstate_bs(bool has_devices, strList *devices, + Error **errp); #endif diff --git a/migration/savevm.c b/migration/savevm.c index 87eaa07553..e4e65d5a22 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2680,18 +2680,18 @@ int save_snapshot(const char *name, Error **errp) return ret; } - if (!bdrv_all_can_snapshot(errp)) { + if (!bdrv_all_can_snapshot(false, NULL, errp)) { return ret; } /* Delete old snapshots of the same name */ if (name) { - if (bdrv_all_delete_snapshot(name, errp) < 0) { + if (bdrv_all_delete_snapshot(name, false, NULL, errp) < 0) { return ret; } } - bs = bdrv_all_find_vmstate_bs(errp); + bs = bdrv_all_find_vmstate_bs(false, NULL, errp); if (bs == NULL) { return ret; } @@ -2762,7 +2762,7 @@ int save_snapshot(const char *name, Error **errp) aio_context_release(aio_context); aio_context = NULL; - ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, errp); + ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, false, NULL, errp); if (ret < 0) { goto the_end; } @@ -2873,15 +2873,15 @@ int load_snapshot(const char *name, Error **errp) AioContext *aio_context; MigrationIncomingState *mis = migration_incoming_get_current(); - if (!bdrv_all_can_snapshot(errp)) { + if (!bdrv_all_can_snapshot(false, NULL, errp)) { return -1; } - ret = bdrv_all_find_snapshot(name, errp); + ret = bdrv_all_find_snapshot(name, false, NULL, errp); if (ret < 0) { return -1; } - bs_vm_state = bdrv_all_find_vmstate_bs(errp); + bs_vm_state = bdrv_all_find_vmstate_bs(false, NULL, errp); if (!bs_vm_state) { return -1; } @@ -2908,7 +2908,7 @@ int load_snapshot(const char *name, Error **errp) /* Flush all IO requests so they don't interfere with the new state. */ bdrv_drain_all_begin(); - ret = bdrv_all_goto_snapshot(name, errp); + ret = bdrv_all_goto_snapshot(name, false, NULL, errp); if (ret < 0) { goto err_drain; } diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 14848a3381..f1b9df7250 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -1142,7 +1142,7 @@ void hmp_delvm(Monitor *mon, const QDict *qdict) Error *err = NULL; const char *name = qdict_get_str(qdict, "name"); - bdrv_all_delete_snapshot(name, &err); + bdrv_all_delete_snapshot(name, false, NULL, &err); hmp_handle_error(mon, err); } diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c index 8785489c02..2dd474c7a0 100644 --- a/replay/replay-debugging.c +++ b/replay/replay-debugging.c @@ -149,7 +149,7 @@ static char *replay_find_nearest_snapshot(int64_t icount, *snapshot_icount = -1; - bs = bdrv_all_find_vmstate_bs(NULL); + bs = bdrv_all_find_vmstate_bs(false, NULL, NULL); if (!bs) { goto fail; } @@ -160,7 +160,7 @@ static char *replay_find_nearest_snapshot(int64_t icount, aio_context_release(aio_context); for (i = 0; i < nb_sns; i++) { - if (bdrv_all_find_snapshot(sn_tab[i].name, NULL) == 0) { + if (bdrv_all_find_snapshot(sn_tab[i].name, false, NULL, NULL) == 0) { if (sn_tab[i].icount != -1ULL && sn_tab[i].icount <= icount && (!nearest || nearest->icount < sn_tab[i].icount)) {