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Fri, 08 May 2020 08:42:26 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-308-CRSaoGbTPG-XSvltb3XyEA-1; Fri, 08 May 2020 08:42:18 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AECAF1005510; Fri, 8 May 2020 12:42:17 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-113-190.ams2.redhat.com [10.36.113.190]) by smtp.corp.redhat.com (Postfix) with ESMTP id AC7BD19167; Fri, 8 May 2020 12:42:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588941740; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=prSLUMQRDRgoKC7sDQ/elX7ogSIiZSGw4L7684zV2jc=; b=ZICmHtVKdbWfTeuV+olEbUox+juZvc4fEZiQpLYlp0zshGkxH2VnTeLaMGj6NOTzxRV/kY NAXO0rXhq8a1bqYRkDXdsZ97Rq34HvwQi9xK6oNvFr4CoeK5mDIgwOYapHaA7AYTiVZISI ExpFQFEQSDZz6O+cvR10f3/ZoVhW0iQ= X-MC-Unique: CRSaoGbTPG-XSvltb3XyEA-1 From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 27/30] ssh: Support BDRV_REQ_ZERO_WRITE for truncate Date: Fri, 8 May 2020 14:41:32 +0200 Message-Id: <20200508124135.252565-28-kwolf@redhat.com> In-Reply-To: <20200508124135.252565-1-kwolf@redhat.com> References: <20200508124135.252565-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=kwolf@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/08 02:25:09 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] 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, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-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, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Eric Blake Our .bdrv_has_zero_init_truncate can detect when the remote side always zero fills; we can reuse that same knowledge to implement BDRV_REQ_ZERO_WRITE by ignoring it when the server gives it to us for free. Signed-off-by: Eric Blake Message-Id: <20200428202905.770727-7-eblake@redhat.com> Reviewed-by: Richard W.M. Jones Signed-off-by: Kevin Wolf --- block/ssh.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/ssh.c b/block/ssh.c index 9eb33df859..f9e08a4900 100644 --- a/block/ssh.c +++ b/block/ssh.c @@ -883,6 +883,10 @@ static int ssh_file_open(BlockDriverState *bs, QDict *= options, int bdrv_flags, /* Go non-blocking. */ ssh_set_blocking(s->session, 0); =20 + if (s->attrs->type =3D=3D SSH_FILEXFER_TYPE_REGULAR) { + bs->supported_truncate_flags =3D BDRV_REQ_ZERO_WRITE; + } + qapi_free_BlockdevOptionsSsh(opts); =20 return 0; --=20 2.25.3