From patchwork Wed May 30 19:47:58 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 922990 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-cifs-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linuxonhyperv.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40x1Ss3RGgz9s0q for ; Thu, 31 May 2018 05:51:57 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932306AbeE3Tv1 (ORCPT ); Wed, 30 May 2018 15:51:27 -0400 Received: from a2nlsmtp01-04.prod.iad2.secureserver.net ([198.71.225.38]:60182 "EHLO a2nlsmtp01-04.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932256AbeE3Ttz (ORCPT ); Wed, 30 May 2018 15:49:55 -0400 Received: from linuxonhyperv2.linuxonhyperv.com ([107.180.71.197]) by : HOSTING RELAY : with SMTP id O75Pf6FQGN7esO75Pf2xlM; Wed, 30 May 2018 12:48:53 -0700 x-originating-ip: 107.180.71.197 Received: from longli by linuxonhyperv2.linuxonhyperv.com with local (Exim 4.91) (envelope-from ) id 1fO75P-0008Ft-Fm; Wed, 30 May 2018 12:48:43 -0700 From: Long Li To: Steve French , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Cc: Long Li Subject: [Patch v2 06/15] CIFS: Introduce helper function to get page offset and length in smb_rqst Date: Wed, 30 May 2018 12:47:58 -0700 Message-Id: <20180530194807.31657-7-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180530194807.31657-1-longli@linuxonhyperv.com> References: <20180530194807.31657-1-longli@linuxonhyperv.com> Reply-To: longli@microsoft.com X-CMAE-Envelope: MS4wfE2En6LZZmxVtn5WKUvfoKAOIZvu+60DXJGDbf1f8+6++sqxIEmMRhgezaWWXCvpGXnmTXOQuTPDJE2kZeCFY2BD8wyxuA2Vf6TmbqxQJ251u1oJ83B4 e9Jx9UR2v7un3wLbFfsZdGQ8EkJTEJx4gjb9NjVKMdoeUCppyTtFCG8T3CHIVNP8Drxwit4oUMlbYqPE1SOYBt+J51G/w9/3oUDAJONxDd7eonmAXozEy5Bp zRSG34UPEPICL0oARu5ukGvaw5AFKCqcD72VC7GJnw9i255KSW+WOAdq8ZlLewgTdLjy5XTegDI/6hZMxwEpg/Yb50YivHXiUVKw47W4F/+dcvEQ19FwmjT6 8tRKz/oOQ9UWFv+25N7Ei9GYitZVmfcjw2aAiPfpvxZMmo6y+BC++kOUljFYLMpMlB03lW1l Sender: linux-cifs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org From: Long Li Introduce a function rqst_page_get_length to return the page offset and length for a given page in smb_rqst. This function is to be used by following patches. Signed-off-by: Long Li --- fs/cifs/cifsproto.h | 3 +++ fs/cifs/misc.c | 17 +++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index 7933c5f..89dda14 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -557,4 +557,7 @@ int cifs_alloc_hash(const char *name, struct crypto_shash **shash, struct sdesc **sdesc); void cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc); +extern void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, + unsigned int *len, unsigned int *offset); + #endif /* _CIFSPROTO_H */ diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 96849b5..e951417 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -905,3 +905,20 @@ cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) crypto_free_shash(*shash); *shash = NULL; } + +/** + * rqst_page_get_length - obtain the length and offset for a page in smb_rqst + * Input: rqst - a smb_rqst, page - a page index for rqst + * Output: *len - the length for this page, *offset - the offset for this page + */ +void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, + unsigned int *len, unsigned int *offset) +{ + *len = rqst->rq_pagesz; + *offset = (page == 0) ? rqst->rq_offset : 0; + + if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) + *len = rqst->rq_tailsz; + else if (page == 0) + *len = rqst->rq_pagesz - rqst->rq_offset; +}