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Wed, 5 Feb 2020 11:25:38 +0000 Subject: Re: [PATCH v4 1/1] qemu-img: Add --target-is-zero to convert To: David Edmondson , qemu-devel@nongnu.org References: <20200205110248.2009589-1-david.edmondson@oracle.com> <20200205110248.2009589-2-david.edmondson@oracle.com> From: Vladimir Sementsov-Ogievskiy X-Tagtoolbar-Keys: D20200205142536140 Message-ID: <52ad573b-01a7-eaa9-de2d-8f76e77c3a66@virtuozzo.com> Date: Wed, 5 Feb 2020 14:25:36 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 In-Reply-To: <20200205110248.2009589-2-david.edmondson@oracle.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: HE1PR05CA0175.eurprd05.prod.outlook.com (2603:10a6:3:f8::23) To VI1PR08MB4432.eurprd08.prod.outlook.com (2603:10a6:803:102::10) MIME-Version: 1.0 Received: from [172.16.24.200] (185.231.240.5) by HE1PR05CA0175.eurprd05.prod.outlook.com (2603:10a6:3:f8::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2707.21 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: TJfhqPt3vWeIHfl7UdbgrWyI8U/bfLru8LGmeEwEXv3Rz0Y90ZoR1Thc1At4z5hU4BWt70/xYyKIuck7lDYEDtoe0hmtIzJLJgmHZa0sqh+Zr6hKSgIxtDQ/Ky3VIclruVb+4ZCQe4CssuKCKpgM+3suUE20IiGqbBP6UzxCbZH/wCHnypa2JT05TQW9HMRskU84m4SnEQDgCiDgOZpGCqqu4Cp66i4aGvS6RkvEQ7707Nj4bxjjK4wORrMx0U1/6Lq/tMuvEANG61cbAMhqkNod8n2lnvfhFy0c6qM2mFQ6DTEmRS94MCOa3e6ZI+96kHlgKIRQrbpPqB9cEoBOuqvOYwymQ0WNr7Jct/2uGoSp4nAWIvegZP0OPhEu0LdCzwmrQ9dLq0eow29o7DJlaIowkQGU7R0lFDw2u3ym498jR8pgdfCk1oGizjmF212j X-MS-Exchange-AntiSpam-MessageData: yQOD2AvmMPgLyWMFC5hNPnKPfoemtLee3nsqY+RmSbIzoIQbjCPgI/NXCkbSKOe43KvVeeu8W46udLE8ohgV3xsf26OBnp/+DycfeVory8msef5LuunmYvPrbKdwvJArwLqUUfRdlRWPXoTQugpu9g== X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-Network-Message-Id: caee6dcc-001a-4b0c-de5c-08d7aa2e204c X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Feb 2020 11:25:38.4839 (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: kSjYEHeB/iQRlxZe1w3bvJ7fZcbRDqbeaRJ/VskDscS+sDHNTV6LDBFEL6Y9Qtxvv7QOhUyw+r2SxrD0fP9yYQcwQly+dxu0cX0yezVSYGs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB3904 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.13.94 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: qemu-block@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 05.02.2020 14:02, David Edmondson wrote: > In many cases the target of a convert operation is a newly provisioned > target that the user knows is blank (reads as zero). In this situation > there is no requirement for qemu-img to wastefully zero out the entire > device. > > Add a new option, --target-is-zero, allowing the user to indicate that > an existing target device will return zeros for all reads. > > Signed-off-by: David Edmondson Reviewed-by: Vladimir Sementsov-Ogievskiy -- Best regards, Vladimir