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Thu, 11 Jun 2020 16:27:13 +0000 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Subject: [PATCH v4 2/4] block/nbd: define new max_write_zero_fast limit Date: Thu, 11 Jun 2020 19:26:53 +0300 Message-Id: <20200611162655.4538-3-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200611162655.4538-1-vsementsov@virtuozzo.com> References: <20200611162655.4538-1-vsementsov@virtuozzo.com> X-ClientProxiedBy: AM3PR05CA0148.eurprd05.prod.outlook.com (2603:10a6:207:3::26) To AM7PR08MB5494.eurprd08.prod.outlook.com (2603:10a6:20b:dc::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from kvm.sw.ru (185.215.60.159) by AM3PR05CA0148.eurprd05.prod.outlook.com (2603:10a6:207:3::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3088.18 via Frontend Transport; Thu, 11 Jun 2020 16:27:12 +0000 X-Mailer: git-send-email 2.21.0 X-Originating-IP: [185.215.60.159] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c12c565b-de40-4f3d-c7a9-08d80e244bef X-MS-TrafficTypeDiagnostic: AM7PR08MB5493: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:206; 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envelope-from=vsementsov@virtuozzo.com; helo=EUR05-DB8-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/11 12:27:11 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: kwolf@redhat.com, fam@euphon.net, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The NBD spec was recently updated to clarify that max_block doesn't relate to NBD_CMD_WRITE_ZEROES with NBD_CMD_FLAG_FAST_ZERO (which mirrors Qemu flag BDRV_REQ_NO_FALLBACK). bs->bl.max_write_zero_fast is zero by default which means using max_pwrite_zeroes. Update nbd driver to allow larger requests with BDRV_REQ_NO_FALLBACK. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/nbd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/nbd.c b/block/nbd.c index 4ac23c8f62..b0584cf68d 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -1956,6 +1956,7 @@ static void nbd_refresh_limits(BlockDriverState *bs, Error **errp) bs->bl.request_alignment = min; bs->bl.max_pdiscard = QEMU_ALIGN_DOWN(INT_MAX, min); + bs->bl.max_pwrite_zeroes_fast = bs->bl.max_pdiscard; bs->bl.max_pwrite_zeroes = max; bs->bl.max_transfer = max;