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dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=virtuozzo.com; Received: from AM7PR08MB5494.eurprd08.prod.outlook.com (2603:10a6:20b:dc::15) by AM6PR08MB4278.eurprd08.prod.outlook.com (2603:10a6:20b:71::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.18; Mon, 2 Aug 2021 18:54:41 +0000 Received: from AM7PR08MB5494.eurprd08.prod.outlook.com ([fe80::44b9:68ac:bdc7:e23c]) by AM7PR08MB5494.eurprd08.prod.outlook.com ([fe80::44b9:68ac:bdc7:e23c%8]) with mapi id 15.20.4373.026; Mon, 2 Aug 2021 18:54:41 +0000 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Cc: qemu-devel@nongnu.org, ehabkost@redhat.com, berrange@redhat.com, pbonzini@redhat.com, armbru@redhat.com, eblake@redhat.com, mreitz@redhat.com, kwolf@redhat.com, vsementsov@virtuozzo.com, den@openvz.org, nshirokovskiy@virtuozzo.com, yur@virtuozzo.com, dim@virtuozzo.com, igor@virtuozzo.com, pkrempa@redhat.com, libvir-list@redhat.com, stefanha@redhat.com Subject: [PATCH 4/8] block/export: realize BlockParentClass functionality Date: Mon, 2 Aug 2021 21:54:12 +0300 Message-Id: <20210802185416.50877-5-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210802185416.50877-1-vsementsov@virtuozzo.com> References: <20210802185416.50877-1-vsementsov@virtuozzo.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: HE1PR05CA0240.eurprd05.prod.outlook.com (2603:10a6:3:fb::16) To AM7PR08MB5494.eurprd08.prod.outlook.com (2603:10a6:20b:dc::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (185.215.60.211) by HE1PR05CA0240.eurprd05.prod.outlook.com (2603:10a6:3:fb::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4373.18 via Frontend Transport; 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envelope-from=vsementsov@virtuozzo.com; helo=EUR04-HE1-obe.outbound.protection.outlook.com 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/export/export.c | 44 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/block/export/export.c b/block/export/export.c index 6d3b9964c8..39b45feafe 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -14,6 +14,7 @@ #include "qemu/osdep.h" #include "block/block.h" +#include "block/block-parent.h" #include "sysemu/block-backend.h" #include "sysemu/iothread.h" #include "block/export.h" @@ -362,3 +363,46 @@ BlockExportInfoList *qmp_query_block_exports(Error **errp) return head; } + +static int blk_exp_find_child(const char *parent_id, const char *child_name, + BlockDriverState *child_bs, + BdrvChild **child, Error **errp) +{ + BlockExport *exp; + + exp = blk_exp_find(parent_id); + if (exp == NULL) { + return 0; + } + + if (child_name && strcmp(child_name, "root")) { + error_setg(errp, "Block export may have only 'root' child"); + return -EINVAL; + } + + if (!exp->blk || !blk_root(exp->blk)) { + error_setg(errp, "Export '%s' does not have a block driver child", + parent_id); + return -EINVAL; + } + + if (child_bs && blk_bs(exp->blk) != child_bs) { + error_setg(errp, "Export '%s' root child doesn't match", parent_id); + return -EINVAL; + } + + *child = blk_root(exp->blk); + return 1; +} + +BlockParentClass block_parent_export = { + .name = "block export", + .find_child = blk_exp_find_child, +}; + +static void export_init(void) +{ + block_parent_class_register(&block_parent_export); +} + +block_init(export_init); -- 2.29.2