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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 AM7PR08MB5366.eurprd08.prod.outlook.com (2603:10a6:20b:10b::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.26; Thu, 7 May 2020 18:22:02 +0000 Received: from AM7PR08MB5494.eurprd08.prod.outlook.com ([fe80::acfa:5:88c8:b7b9]) by AM7PR08MB5494.eurprd08.prod.outlook.com ([fe80::acfa:5:88c8:b7b9%3]) with mapi id 15.20.2958.034; Thu, 7 May 2020 18:22:02 +0000 Subject: Re: [PATCH v2 10/9] qed: Simplify backing reads To: Eric Blake , qemu-devel@nongnu.org References: <20200507084800.20596-1-vsementsov@virtuozzo.com> <20200507144513.348470-1-eblake@redhat.com> From: Vladimir Sementsov-Ogievskiy X-Tagtoolbar-Keys: D20200507212200850 Message-ID: Date: Thu, 7 May 2020 21:22:00 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 In-Reply-To: <20200507144513.348470-1-eblake@redhat.com> Content-Type: text/plain; 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envelope-from=vsementsov@virtuozzo.com; helo=EUR05-VI1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/07 14:22:03 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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=-0.001, 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, "open list:qed" , stefanha@redhat.com, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 07.05.2020 17:45, Eric Blake wrote: > The other four drivers that support backing files (qcow, qcow2, > parallels, vmdk) all rely on the block layer to populate zeroes when > reading beyond EOF of a short backing file. We can simplify the qed > code by doing likewise. > > Signed-off-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy -- Best regards, Vladimir