From patchwork Fri Jun 15 18:23:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Lingshan X-Patchwork-Id: 10467239 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 B53F4601C2 for ; Fri, 15 Jun 2018 18:24:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A467A28E3B for ; Fri, 15 Jun 2018 18:24:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 970BC28E40; Fri, 15 Jun 2018 18:24:33 +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 3944828E3B for ; Fri, 15 Jun 2018 18:24:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756434AbeFOSYc (ORCPT ); Fri, 15 Jun 2018 14:24:32 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:47139 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756346AbeFOSYb (ORCPT ); Fri, 15 Jun 2018 14:24:31 -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 12:24:19 -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 06/33] TCMU PR: add decode/encode func for PR seq and ver Date: Sat, 16 Jun 2018 02:23:15 +0800 Message-Id: <20180615182342.6239-6-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 three functions, tcmu_pr_info_vers_seq_encode() to encode PR sequence and version into a string, tcmu_pr_info_vers_decode() and tcmu_pr_info_seq_decode() used to decode them. Signed-off-by: Zhu Lingshan --- drivers/target/target_core_user.c | 62 +++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 26d8aee40719..ccb1607edd0a 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -93,6 +93,8 @@ */ #define TCMU_GLOBAL_MAX_BLOCKS_DEF (512 * 1024) +#define TCMU_PR_INFO_XATTR_VERS 1 + static u8 tcmu_kern_cmd_reply_supported; static struct device *tcmu_root_device; @@ -1813,6 +1815,66 @@ tcmu_gen_it_nexus(struct se_session *se_sess, return 0; } +static int +tcmu_pr_info_seq_decode(char *str, u32 *seq) +{ + int rc; + + if (!seq) { + WARN_ON(1); + return -EINVAL; + } + rc = sscanf(str, "0x%08x", seq); + if (rc != 1) { + pr_err("failed to decode PR info seqnum in: %s\n", str); + return -EINVAL; + } + + pr_debug("processed pr_info seqnum: %u\n", *seq); + + return 0; +} + +static int +tcmu_pr_info_vers_seq_encode(char *buf, size_t buf_remain, u32 vers, u32 seq) +{ + int rc; + + rc = snprintf(buf, buf_remain, "0x%08x\n0x%08x\n", + vers, seq); + if ((rc < 0) || (rc >= buf_remain)) { + pr_err("failed to encode PR vers and seq\n"); + return -EINVAL; + } + + return rc; +} + +static int +tcmu_pr_info_vers_decode(char *str, u32 *vers) +{ + int rc; + + if (!vers) { + WARN_ON(1); + return -EINVAL; + } + rc = sscanf(str, "0x%08x", vers); + if (rc != 1) { + pr_err("failed to decode PR info version in: %s\n", str); + return -EINVAL; + } + + if (*vers != TCMU_PR_INFO_XATTR_VERS) { + pr_err("unsupported PR info version: %u\n", *vers); + return -EINVAL; + } + + pr_debug("processed pr_info version: %u\n", *vers); + + return 0; +} + static int tcmu_configure_device(struct se_device *dev) { struct tcmu_dev *udev = TCMU_DEV(dev);