Received: by 2002:ac0:a581:0:0:0:0:0 with SMTP id m1-v6csp2457540imm; Sat, 23 Jun 2018 19:29:01 -0700 (PDT) X-Google-Smtp-Source: ADUXVKIIw75TXofBHEncDHdx3OYsYvTQIGvxrCiykbBaaDgxJzmpgc1Zh6FLEBZw5/qBwMFXaWr4 X-Received: by 2002:a17:902:1005:: with SMTP id b5-v6mr7293227pla.207.1529807341425; Sat, 23 Jun 2018 19:29:01 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1529807341; cv=none; d=google.com; s=arc-20160816; b=kD6UQBH7xedfxjEFLdnVTu2PX08Mk9QxmVU3OYu02RXxEGKcKctd1hs1dK4ksEuBr8 DD8XVczjZ4QuPB01O1/M26BOYnZqC52uMm+44Ys1VdctcK1e7b6zuKmufjze5+IdUVxe 1qf80iIyIbsrUI6rZrxKWqBBiuJCmFnpaqY6GT6qkxSOXO6Z/hQl/BBDOjhBLNr4HhhD sjhAxdf7MQdLV31B42qNHp/Xepq6FNtfL8VslVynlx0tXyjdelJpdB2rPEqhXQjb5D1p GmeYARSGS1x0DnSWy56lVbyBH74Rr0FE0kfkOqsmenPQcWTiHABXuVa5rvdIt9d1COfr F55w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:from:references:to:subject:arc-authentication-results; bh=x4R6wlvq2rb/NeLkebsb7CBZy7iKPrxNTBjh8h+VHts=; b=Hquf6Az4TnpOBLzC/e9mQSklwkQHJeHXcvZ2HYwTn0BkfN88bY2jwKSWNnBBHyjnMb DCoLVGmxG233Vzr4ShwaZBPn5MZTDyYwaix2hLspbX/cQQuoftRb60eRxex5Pk3Y/cCo Jl52VEQqITt+wDzU/aNSA9Se+K0JxdUCvttbuagg1EIQOY7kOVkEkMRYiPfPzW3CqqBQ sMkTlmH1/QEk0ii1WZOADMl3SnVsPr6g2FJqPhMFhoYM4NMDcLuEsbqbKWYrcalj0hqa NMQ47geconxAH8HOkTSQ0uzns+UIDB/ZSJnT2Ae/pk+TL3beVqvVIx6xiYb6PKuHW9QN ISCQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d37-v6si10996932pla.85.2018.06.23.19.28.47; Sat, 23 Jun 2018 19:29:01 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752107AbeFXC1V (ORCPT + 99 others); Sat, 23 Jun 2018 22:27:21 -0400 Received: from p3plsmtpa12-04.prod.phx3.secureserver.net ([68.178.252.233]:59044 "EHLO p3plsmtpa12-04.prod.phx3.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751895AbeFXC1T (ORCPT ); Sat, 23 Jun 2018 22:27:19 -0400 Received: from [192.168.0.67] ([24.218.182.144]) by :SMTPAUTH: with ESMTPSA id WukIfzN2dOIAfWukIfWpdM; Sat, 23 Jun 2018 19:27:19 -0700 Subject: Re: [Patch v2 11/15] CIFS: Pass page offset for calculating signature To: longli@microsoft.com, Steve French , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org References: <20180530194807.31657-1-longli@linuxonhyperv.com> <20180530194807.31657-12-longli@linuxonhyperv.com> From: Tom Talpey Message-ID: <7a9ee28d-4c18-c4fd-259b-1feeeb3fb83b@talpey.com> Date: Sat, 23 Jun 2018 22:27:18 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180530194807.31657-12-longli@linuxonhyperv.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-CMAE-Envelope: MS4wfAfAxpIvNvhcES6ZUP6NUJqlXrsi8CXxl9zi+d+wOKvNHv3U7Clr2UkeuyIAkIMxiVoyVrEm5Cfrbj222JT5rxyHyb7z8Xn7HVC7lC8J+AlWHKK0HXHH 9KFIBiguNIyz3/TlQTJWUTmOl6z2EtAWMqWOleYOCNfwnNe4CiEW0IEWofOVyYcuEZYBU36tws3POtiZH3Ti9dZWv0nNjq0zxOjk6MYSrQiIyQbFC5PyJqfo 4y/zQOtRA7QmWwQHoT3u/dG+787iDkeUdZLkpac4MgkE0e5U+4YmzYDaba519bct8o+PP69rGBcaAzDgJcTk2bfBC9+FC3k9NFblMSDiVLs7XoVz7+eFy4te qLsutaKv Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/30/2018 3:48 PM, Long Li wrote: > From: Long Li > > When calculating signature for the packet, it needs to read into the > correct page offset for the data. > > Signed-off-by: Long Li > --- > fs/cifs/cifsencrypt.c | 9 +++++---- > 1 file changed, 5 insertions(+), 4 deletions(-) > > diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c > index a6ef088..e88303c 100644 > --- a/fs/cifs/cifsencrypt.c > +++ b/fs/cifs/cifsencrypt.c > @@ -68,11 +68,12 @@ int __cifs_calc_signature(struct smb_rqst *rqst, > > /* now hash over the rq_pages array */ > for (i = 0; i < rqst->rq_npages; i++) { > - void *kaddr = kmap(rqst->rq_pages[i]); > - size_t len = rqst->rq_pagesz; > + void *kaddr; > + unsigned int len, offset; > > - if (i == rqst->rq_npages - 1) > - len = rqst->rq_tailsz; > + rqst_page_get_length(rqst, i, &len, &offset); > + > + kaddr = (char *) kmap(rqst->rq_pages[i]) + offset; I suppose it's more robust to map a page at a time, but it's pretty expensive. Is this the only way to iterate over a potentially very large block of data? For example, a 1MB segment means 256 kmap/kunmaps. Tom. > > crypto_shash_update(shash, kaddr, len); > >