From patchwork Tue Sep 29 12:38:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Denis V. Lunev\" via" X-Patchwork-Id: 11805783 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E63AA112C for ; Tue, 29 Sep 2020 12:50:30 +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 81971208B8 for ; Tue, 29 Sep 2020 12:50:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 81971208B8 Authentication-Results: mail.kernel.org; dmarc=pass (p=none dis=none) header.from=nongnu.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:35160 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kNF5R-0001sU-FF for patchwork-qemu-devel@patchwork.kernel.org; Tue, 29 Sep 2020 08:50:29 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53210) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kNEvt-0006w5-3t; Tue, 29 Sep 2020 08:40:40 -0400 Received: from relay.sw.ru ([185.231.240.75]:34822 helo=relay3.sw.ru) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kNEvp-0000Rt-Dw; Tue, 29 Sep 2020 08:40:36 -0400 Received: from [172.16.25.136] (helo=localhost.sw.ru) by relay3.sw.ru with esmtp (Exim 4.94) (envelope-from ) id 1kNEvE-002EOe-NH; Tue, 29 Sep 2020 15:39:56 +0300 To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, kwolf@redhat.com, mreitz@redhat.com, stefanha@redhat.com, fam@euphon.net, jsnow@redhat.com, armbru@redhat.com, eblake@redhat.com, den@openvz.org, vsementsov@virtuozzo.com, andrey.shinkevich@virtuozzo.com Subject: [PATCH v10 4/9] copy-on-read: pass base node name to COR driver Date: Tue, 29 Sep 2020 15:38:24 +0300 Message-Id: <1601383109-110988-5-git-send-email-andrey.shinkevich@virtuozzo.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1601383109-110988-1-git-send-email-andrey.shinkevich@virtuozzo.com> References: <1601383109-110988-1-git-send-email-andrey.shinkevich@virtuozzo.com> Received-SPF: pass client-ip=185.231.240.75; envelope-from=andrey.shinkevich@virtuozzo.com; helo=relay3.sw.ru X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/29 08:38:56 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Reply-to: Andrey Shinkevich X-Patchwork-Original-From: Andrey Shinkevich via From: "Denis V. Lunev\" via" To limit the guest's COR operations by the base node in the backing chain during stream job, pass the base node name to the copy-on-read driver. The rest of the functionality will be implemented in the patch that follows. Signed-off-by: Andrey Shinkevich --- block/copy-on-read.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/block/copy-on-read.c b/block/copy-on-read.c index 3c8231f..e04092f 100644 --- a/block/copy-on-read.c +++ b/block/copy-on-read.c @@ -24,19 +24,23 @@ #include "block/block_int.h" #include "qemu/module.h" #include "qapi/error.h" +#include "qapi/qmp/qerror.h" #include "qapi/qmp/qdict.h" #include "block/copy-on-read.h" typedef struct BDRVStateCOR { bool active; + BlockDriverState *base_bs; } BDRVStateCOR; static int cor_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { + BlockDriverState *base_bs = NULL; BDRVStateCOR *state = bs->opaque; + const char *base_node = qdict_get_try_str(options, "base"); bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds, BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, @@ -52,7 +56,16 @@ static int cor_open(BlockDriverState *bs, QDict *options, int flags, ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & bs->file->bs->supported_zero_flags); + if (base_node) { + qdict_del(options, "base"); + base_bs = bdrv_lookup_bs(NULL, base_node, errp); + if (!base_bs) { + error_setg(errp, QERR_BASE_NOT_FOUND, base_node); + return -EINVAL; + } + } state->active = true; + state->base_bs = base_bs; /* * We don't need to call bdrv_child_refresh_perms() now as the permissions