From patchwork Sat Sep 8 02:13:38 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 10592853 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 49F10921 for ; Sat, 8 Sep 2018 02:16:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4077C2B684 for ; Sat, 8 Sep 2018 02:16:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 34FAF2B68A; Sat, 8 Sep 2018 02:16:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C7DB92B684 for ; Sat, 8 Sep 2018 02:16:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726681AbeIHG7L (ORCPT ); Sat, 8 Sep 2018 02:59:11 -0400 Received: from a2nlsmtp01-02.prod.iad2.secureserver.net ([198.71.225.36]:47266 "EHLO a2nlsmtp01-02.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726594AbeIHG7K (ORCPT ); Sat, 8 Sep 2018 02:59:10 -0400 Received: from linuxonhyperv2.linuxonhyperv.com ([107.180.71.197]) by : HOSTING RELAY : with ESMTP id ySlRfRLyRWFPMySlRffcuS; Fri, 07 Sep 2018 19:14:22 -0700 x-originating-ip: 107.180.71.197 Received: from longli by linuxonhyperv2.linuxonhyperv.com with local (Exim 4.91) (envelope-from ) id 1fySlR-0005Dv-F8; Fri, 07 Sep 2018 19:14:21 -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 v3 06/16] CIFS: Introduce helper function to get page offset and length in smb_rqst Date: Sat, 8 Sep 2018 02:13:38 +0000 Message-Id: <20180908021348.19956-7-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180908021348.19956-1-longli@linuxonhyperv.com> References: <20180908021348.19956-1-longli@linuxonhyperv.com> Reply-To: longli@microsoft.com X-CMAE-Envelope: MS4wfNnkn2GQr754MkbBwSuvZi90bTU6AleeQvB9vJSMf4YDPVNjuFu9iKbGq2bLfNHQ/iBZ6uY69EP8t3FYzToGO8usTpv1da36Fu3R+AIZdi1GXTkB4BEO hCscCnAoWn4WVjYYlP89mVQnBDd+Jhgx1Xob3KXXgvymnGePjpn41mdAIjy1LbS+SSRgGiNE27aEQSaebpTLRoW/LGY+KxP2wjsEGs49apEf6cX3EEeqXEdC QQBU6h6VyVq1lgAOmzc69Hh0l+SEmMA7yTo32Nyix390vu5hk1Sll7O12w5Merx+7UMwVcxE0vVKVEfdTE698NL7cfEHeX2Cgd8wD2DHogxlHziAukK9LQSY JfPsELPkiy9KI3/FjpiTHvEcrC9axcVXTEDYuFncUMk6mCOfkWI0muadDFDhl/l83QOgrzNp Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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; +}