From patchwork Thu May 16 22:40:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Verma, Vishal L" X-Patchwork-Id: 10947101 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 BCD33924 for ; Thu, 16 May 2019 22:41:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id ABB3728CCD for ; Thu, 16 May 2019 22:41:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9FCE528CD1; Thu, 16 May 2019 22:41:01 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BE70B28CCD for ; Thu, 16 May 2019 22:40:59 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 613D221945DE0; Thu, 16 May 2019 15:40:59 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=134.134.136.20; helo=mga02.intel.com; envelope-from=vishal.l.verma@intel.com; receiver=linux-nvdimm@lists.01.org Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 18DFE21255850 for ; Thu, 16 May 2019 15:40:57 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 May 2019 15:40:56 -0700 X-ExtLoop1: 1 Received: from vverma7-desk1.lm.intel.com ([10.232.112.185]) by FMSMGA003.fm.intel.com with ESMTP; 16 May 2019 15:40:56 -0700 From: Vishal Verma To: Subject: [ndctl PATCH v3 01/10] libdaxctl: add interfaces in support of device modes Date: Thu, 16 May 2019 16:40:44 -0600 Message-Id: <20190516224053.3655-2-vishal.l.verma@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190516224053.3655-1-vishal.l.verma@intel.com> References: <20190516224053.3655-1-vishal.l.verma@intel.com> MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dave Hansen , Pavel Tatashin Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP In preparation for libdaxctl and daxctl to grow operational modes for DAX devices, add the following supporting APIs: daxctl_dev_get_ctx daxctl_dev_is_enabled Cc: Dan Williams Signed-off-by: Vishal Verma --- daxctl/lib/libdaxctl.c | 30 ++++++++++++++++++++++++++++++ daxctl/lib/libdaxctl.sym | 6 ++++++ daxctl/libdaxctl.h | 2 ++ 3 files changed, 38 insertions(+) diff --git a/daxctl/lib/libdaxctl.c b/daxctl/lib/libdaxctl.c index c2e3a52..70f896b 100644 --- a/daxctl/lib/libdaxctl.c +++ b/daxctl/lib/libdaxctl.c @@ -559,6 +559,36 @@ static void dax_regions_init(struct daxctl_ctx *ctx) } } +static int is_enabled(const char *drvpath) +{ + struct stat st; + + if (lstat(drvpath, &st) < 0 || !S_ISLNK(st.st_mode)) + return 0; + else + return 1; +} + +DAXCTL_EXPORT int daxctl_dev_is_enabled(struct daxctl_dev *dev) +{ + struct daxctl_ctx *ctx = daxctl_dev_get_ctx(dev); + char *path = dev->dev_buf; + int len = dev->buf_len; + + if (snprintf(path, len, "%s/driver", dev->dev_path) >= len) { + err(ctx, "%s: buffer too small!\n", + daxctl_dev_get_devname(dev)); + return 0; + } + + return is_enabled(path); +} + +DAXCTL_EXPORT struct daxctl_ctx *daxctl_dev_get_ctx(struct daxctl_dev *dev) +{ + return dev->region->ctx; +} + DAXCTL_EXPORT struct daxctl_dev *daxctl_dev_get_first(struct daxctl_region *region) { dax_devices_init(region); diff --git a/daxctl/lib/libdaxctl.sym b/daxctl/lib/libdaxctl.sym index 84d3a69..c4af9a7 100644 --- a/daxctl/lib/libdaxctl.sym +++ b/daxctl/lib/libdaxctl.sym @@ -50,3 +50,9 @@ LIBDAXCTL_5 { global: daxctl_region_get_path; } LIBDAXCTL_4; + +LIBDAXCTL_6 { +global: + daxctl_dev_get_ctx; + daxctl_dev_is_enabled; +} LIBDAXCTL_5; diff --git a/daxctl/libdaxctl.h b/daxctl/libdaxctl.h index 1d13ea2..e20ccb4 100644 --- a/daxctl/libdaxctl.h +++ b/daxctl/libdaxctl.h @@ -67,6 +67,8 @@ const char *daxctl_dev_get_devname(struct daxctl_dev *dev); int daxctl_dev_get_major(struct daxctl_dev *dev); int daxctl_dev_get_minor(struct daxctl_dev *dev); unsigned long long daxctl_dev_get_size(struct daxctl_dev *dev); +struct daxctl_ctx *daxctl_dev_get_ctx(struct daxctl_dev *dev); +int daxctl_dev_is_enabled(struct daxctl_dev *dev); #define daxctl_dev_foreach(region, dev) \ for (dev = daxctl_dev_get_first(region); \