From patchwork Wed May 30 19:47:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 10439713 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 18FE3601E9 for ; Wed, 30 May 2018 19:49:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 10B2329361 for ; Wed, 30 May 2018 19:49:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 04DE629368; Wed, 30 May 2018 19:49:52 +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=unavailable 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 AF83929361 for ; Wed, 30 May 2018 19:49:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932184AbeE3Ttq (ORCPT ); Wed, 30 May 2018 15:49:46 -0400 Received: from a2nlsmtp01-02.prod.iad2.secureserver.net ([198.71.225.36]:51060 "EHLO a2nlsmtp01-02.prod.iad2.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753685AbeE3Ttp (ORCPT ); Wed, 30 May 2018 15:49:45 -0400 Received: from linuxonhyperv2.linuxonhyperv.com ([107.180.71.197]) by : HOSTING RELAY : with SMTP id O75Gfpc5gPEk0O75GflACW; Wed, 30 May 2018 12:48:44 -0700 x-originating-ip: 107.180.71.197 Received: from longli by linuxonhyperv2.linuxonhyperv.com with local (Exim 4.91) (envelope-from ) id 1fO75G-0008FV-Oa; Wed, 30 May 2018 12:48:34 -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 02/15] CIFS: Add support for direct pages in rdata Date: Wed, 30 May 2018 12:47:54 -0700 Message-Id: <20180530194807.31657-3-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: MS4wfFoVw1QOP6qbKWSlBmVq0odeGMyFUMygKtA/MV1x3MsdRHI9JZfI9jwRHzD10nu7PLBJlIhoBF/zfRwlnBLZDtykxjZ4X1qS4ap1g7hJmgtb2ZJea9Sc cmCku61UOA5DFwJxDvoDMbYIYr88l4siIJTNzVrzyyJcjua6+pahkMwb3IafxHV9KgjqP5fzET/2McRN2EZHgFOyufKtOgEiG+Uk/KB6XdjTM4g9peEsiQtT thv4zIP2QXbxbcEXNuF+BhVkFXhqIdS+IomwN0U5sIHoJKFrJhoD796X9l1dP5JC4lp3sZmmKQ2fe0JewGWdXRdzhaOd3UdwbLeW/C791YL4CIsa74b2wpZ9 0lwHEgowVyT1p0ZZ6ZshMVOFmPcsO04xwuP5oozNGUC6HxDaZk4tgTP/R7OLw/CdJRldfbUu 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 Add a function to allocate rdata without allocating pages for data transfer. This gives the caller an option to pass a number of pages that point to the data buffer. rdata is still reponsible for free those pages after it's done. Signed-off-by: Long Li --- fs/cifs/cifsglob.h | 2 +- fs/cifs/file.c | 23 ++++++++++++++++++++--- 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 8d16c3e..56864a87 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -1179,7 +1179,7 @@ struct cifs_readdata { unsigned int tailsz; unsigned int credits; unsigned int nr_pages; - struct page *pages[]; + struct page **pages; }; struct cifs_writedata; diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 23fd430..1c98293 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2880,13 +2880,13 @@ cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) } static struct cifs_readdata * -cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) +cifs_readdata_direct_alloc(struct page **pages, work_func_t complete) { struct cifs_readdata *rdata; - rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), - GFP_KERNEL); + rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); if (rdata != NULL) { + rdata->pages = pages; kref_init(&rdata->refcount); INIT_LIST_HEAD(&rdata->list); init_completion(&rdata->done); @@ -2896,6 +2896,22 @@ cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) return rdata; } +static struct cifs_readdata * +cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) +{ + struct page **pages = + kzalloc(sizeof(struct page *) * nr_pages, GFP_KERNEL); + struct cifs_readdata *ret = NULL; + + if (pages) { + ret = cifs_readdata_direct_alloc(pages, complete); + if (!ret) + kfree(pages); + } + + return ret; +} + void cifs_readdata_release(struct kref *refcount) { @@ -2910,6 +2926,7 @@ cifs_readdata_release(struct kref *refcount) if (rdata->cfile) cifsFileInfo_put(rdata->cfile); + kvfree(rdata->pages); kfree(rdata); }