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Mon, 2 Mar 2020 13:56:00 +0000 Subject: Re: [PATCH v0 0/2] allow to set 'drive' property on a realized block device To: Kevin Wolf References: <20191110190310.19799-1-dplotnikov@virtuozzo.com> <20200302133837.GC4965@linux.fritz.box> From: Denis Plotnikov Message-ID: <20b9cc1f-8fbe-99fc-bbdb-5605b1c186a9@virtuozzo.com> Date: Mon, 2 Mar 2020 16:55:56 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 In-Reply-To: <20200302133837.GC4965@linux.fritz.box> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-ClientProxiedBy: HE1PR05CA0359.eurprd05.prod.outlook.com (2603:10a6:7:94::18) To AM0PR08MB3745.eurprd08.prod.outlook.com (2603:10a6:208:ff::27) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.64] (178.34.150.179) by HE1PR05CA0359.eurprd05.prod.outlook.com (2603:10a6:7:94::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2772.14 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: cRb5M6ZqLmllLYr02y1i8KMHLPmoAYaadw2K/6Qqv9/Bae7tCn2CqxbUbxsJHjNsXxbwyLta3J7inUPaXGOaLCWO7CD+bDSNPc/Ohta+eVMemfWahuDVpa3UE0FhUm4xUdYhKEXTmTfv8W3QMr6HXQ== X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0f2c40bc-3428-46c4-0083-08d7beb17072 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2020 13:56:00.2851 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: kcYoRmeSFFo6UGYRU7qFGAZDKFBaqDvL8cmZ/8OcQtQxXqcXZpWm//gOPEytd5qaORGedPBQdOQVgZU9Selzjf28ZtuRwih5DnD4+XRvmWI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB5026 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.1.111 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: vsementsov@virtuozzo.com, berrange@redhat.com, ehabkost@redhat.com, qemu-block@nongnu.org, qemu-devel@nongnu.org, mreitz@redhat.com, pbonzini@redhat.com, den@virtuozzo.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 02.03.2020 16:38, Kevin Wolf wrote: > Am 10.11.2019 um 20:03 hat Denis Plotnikov geschrieben: >> This allows to replace the file on a block device and is useful >> to workaround the cases (migration) when the VM image is placed on >> some shared storage with exclusive file opening model but the image >> should be open form more than one app. >> >> The previous version of approaching the workaround was based on the >> "blockdev-change-medium" command modification but had some flaws: >> * semantics: blockdev-change-medium is aimed to be used with removable devices >> only >> * interface: it can't accept all possible combination of parameters for >> the "drive" replacement (creation). >> >> More details here: http://patchwork.ozlabs.org/patch/1179329/ >> >> The current series suggests another approach: >> 1. blockdev-add >> 2. qom-set disk.drive = the blockdev added (this is what the series adds) > Are you still planning to send another version? > > Kevin Not in the near future :) There is an unresolved problem with bitmap-migration is case of block dev replacement. Still don't know how to do it in the proper way. Denis >