From patchwork Fri Jun 15 18:23:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Lingshan X-Patchwork-Id: 10467271 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 73CDA60384 for ; Fri, 15 Jun 2018 18:24:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6479228E3B for ; Fri, 15 Jun 2018 18:24:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 594DB28E40; Fri, 15 Jun 2018 18:24:52 +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=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 0141F28E3B for ; Fri, 15 Jun 2018 18:24:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756487AbeFOSYu (ORCPT ); Fri, 15 Jun 2018 14:24:50 -0400 Received: from smtp2.provo.novell.com ([137.65.250.81]:52279 "EHLO smtp2.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756486AbeFOSYt (ORCPT ); Fri, 15 Jun 2018 14:24:49 -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 12:24:43 -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 14/33] TCMU PR: add a function can get PR info from a dev Date: Sat, 16 Jun 2018 02:23:23 +0800 Message-Id: <20180615182342.6239-14-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 function tcmu_pr_info_get() which can help get Persistent Reservation information from a TCMU device. 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 12f4a5a5c1e1..0f8eeed61c60 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -2253,6 +2253,57 @@ static int tcmu_pr_info_decode(char *pr_xattr, int pr_xattr_len, return rc; } +static int tcmu_pr_info_get(struct tcmu_dev *udev, + struct tcmu_pr_info **_pr_info, + char **_pr_xattr, int *_pr_xattr_len) +{ + int rc; + char *pr_xattr = udev->pr_info.pr_info_buf; + char *dup_xattr = NULL; + int pr_xattr_len = 0; + struct tcmu_pr_info *pr_info = NULL; + + if (!_pr_info) { + WARN_ON(1); + return -EINVAL; + } + + rc = tcmu_get_dev_pr_info(udev, &pr_xattr_len); + + if (rc) { + if (rc != -ENODATA) + pr_err("failed to obtain PR xattr: %d\n", rc); + return rc; + } + + if (_pr_xattr) { + /* dup before decode, which trashes @pr_xattr */ + dup_xattr = kstrdup(pr_xattr, GFP_KERNEL); + if (!dup_xattr) + return -ENOMEM; + } + + rc = tcmu_pr_info_decode(pr_xattr, pr_xattr_len, &pr_info); + if (rc) { + pr_err("failed to decode PR xattr: %d\n", rc); + goto err_dup_xattr_free; + } + + if (_pr_xattr) { + WARN_ON(!_pr_xattr_len); + *_pr_xattr = dup_xattr; + *_pr_xattr_len = pr_xattr_len; + } + + *_pr_info = pr_info; + pr_debug("successfully obtained PR info\n"); + return 0; + +err_dup_xattr_free: + kfree(dup_xattr); + return rc; +} + static int tcmu_configure_device(struct se_device *dev) { struct tcmu_dev *udev = TCMU_DEV(dev);