From patchwork Fri Jun 15 18:23:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Lingshan X-Patchwork-Id: 10467259 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 A97D660384 for ; Fri, 15 Jun 2018 18:24:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9AE5828E3B for ; Fri, 15 Jun 2018 18:24:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8F78028E40; Fri, 15 Jun 2018 18:24:45 +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 3D86F28E3B for ; Fri, 15 Jun 2018 18:24:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756467AbeFOSYn (ORCPT ); Fri, 15 Jun 2018 14:24:43 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:46146 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756466AbeFOSYm (ORCPT ); Fri, 15 Jun 2018 14:24:42 -0400 Received: from vstart.localdomain (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by smtp2.provo.novell.com with ESMTP (TLS encrypted); Fri, 15 Jun 2018 12:24:34 -0600 From: Zhu Lingshan To: target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, nab@linux-iscsi.org, mchristi@redhat.com, martin.petersen@oracle.com Cc: hare@suse.de, lduncan@suse.com, ddiss@suse.de, lszhu@suse.de, Zhu Lingshan Subject: [PATCH 11/33] TCMU PR: add funcs to handle TCMU PR registrations Date: Sat, 16 Jun 2018 02:23:20 +0800 Message-Id: <20180615182342.6239-11-lszhu@suse.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180615182342.6239-1-lszhu@suse.com> References: <20180615182342.6239-1-lszhu@suse.com> Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch added a struct tcmu_pr_reg which contain Persistent Reservation registrations information, also added two functions tcmu_pr_info_reg_decode() and tcmu_pr_info_reg_encode() to handle it. Signed-off-by: Zhu Lingshan --- drivers/target/target_core_user.c | 51 +++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 8e61641f34ac..55f1ba98a688 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -228,6 +228,13 @@ struct tcmu_scsi2_rsv { char it_nexus[TCMU_PR_IT_NEXUS_MAXLEN]; }; +struct tcmu_pr_reg { + struct list_head regs_node; + u64 key; /* registered key */ + /* I-T nexus for registration */ + char it_nexus[TCMU_PR_IT_NEXUS_MAXLEN]; +}; + /* * To avoid dead lock the mutex lock order should always be: * @@ -2080,6 +2087,50 @@ static int tcmu_pr_info_num_regs_encode(char *buf, size_t buf_remain, return rc; } +static int tcmu_pr_info_reg_decode(char *str, struct tcmu_pr_reg **_reg) +{ + struct tcmu_pr_reg *reg; + int rc; + + if (!_reg) { + WARN_ON(1); + return -EINVAL; + } + + reg = kzalloc(sizeof(*reg), GFP_KERNEL); + if (!reg) + return -ENOMEM; + + /* registration key and I-T nexus with space separator */ + rc = sscanf(str, "0x%016llx %" __stringify(TCMU_PR_IT_NEXUS_MAXLEN) + "s", ®->key, reg->it_nexus); + if (rc != 2) { + pr_err("failed to parse PR reg: %s\n", str); + kfree(reg); + return -EINVAL; + } + + pr_debug("processed pr_info reg: %s\n", str); + *_reg = reg; + + return 0; +} + +static int tcmu_pr_info_reg_encode(char *buf, size_t buf_remain, + struct tcmu_pr_reg *reg) +{ + int rc; + + rc = snprintf(buf, buf_remain, "0x%016llx %s\n", reg->key, + reg->it_nexus); + if ((rc < 0) || (rc >= buf_remain)) { + pr_err("failed to encode PR registration\n"); + return -EINVAL; + } + + return rc; +} + static int tcmu_configure_device(struct se_device *dev) { struct tcmu_dev *udev = TCMU_DEV(dev);