From patchwork Mon Jun 13 15:52:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Shtepa X-Patchwork-Id: 12879941 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0ED76C433EF for ; Mon, 13 Jun 2022 18:55:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345364AbiFMSzn (ORCPT ); Mon, 13 Jun 2022 14:55:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345077AbiFMSz1 (ORCPT ); Mon, 13 Jun 2022 14:55:27 -0400 Received: from mx4.veeam.com (mx4.veeam.com [104.41.138.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 570C4FC833; Mon, 13 Jun 2022 08:59:53 -0700 (PDT) Received: from mail.veeam.com (prgmbx01.amust.local [172.24.128.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx4.veeam.com (Postfix) with ESMTPS id 6F344CCE27; Mon, 13 Jun 2022 18:54:16 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=veeam.com; s=mx4-2022; t=1655135656; bh=JeE4IDLZnrkgWQvxzU/0/BAJVvEljvMQrQHfVZ+A+xM=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=MSw3FLACURP7Fe6FANRB+tcHjJCINeI7ZI37CTeiDgUlFR2XJRltn5tsnfM+yuHoY FNZzluNQuZfT5fgGj7Dcv08r5DiisCtJFpSprCrkfXsnBWz1/fcTVJa5crAORO937f /TIeBLgrdXB6E3zjchji9n92+F5Vc05RW2Ok72gfeBH7C6pSHj08jsvA7geN3fxp9s 7MFxLla0NsIDOSijG+vNB96pTrm4mA0Riizc0DHk5XOnhOk7szGX/es7cWzCDLBMO2 Oigk8zuPXYS00O1nzCWmIzxttXAAJht/mND7KsB69RtWjyLMdzDP+Dy7WsPt4KCkvO W+R01to3DUp4A== Received: from prgdevlinuxpatch01.amust.local (172.24.14.5) by prgmbx01.amust.local (172.24.128.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.9; Mon, 13 Jun 2022 17:54:14 +0200 From: Sergei Shtepa To: , , CC: Sergei Shtepa Subject: [PATCH 05/20] block, blksnap: interaction with sysfs Date: Mon, 13 Jun 2022 18:52:58 +0300 Message-ID: <1655135593-1900-6-git-send-email-sergei.shtepa@veeam.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1655135593-1900-1-git-send-email-sergei.shtepa@veeam.com> References: <1655135593-1900-1-git-send-email-sergei.shtepa@veeam.com> MIME-Version: 1.0 X-Originating-IP: [172.24.14.5] X-ClientProxiedBy: prgmbx01.amust.local (172.24.128.102) To prgmbx01.amust.local (172.24.128.102) X-EsetResult: clean, is OK X-EsetId: 37303A29D2A50A536D7766 X-Veeam-MMEX: True Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Provides creation of a class file /sys/class/blksnap and a device file /dev/blksnap for module management. Signed-off-by: Sergei Shtepa --- drivers/block/blksnap/sysfs.c | 81 +++++++++++++++++++++++++++++++++++ drivers/block/blksnap/sysfs.h | 5 +++ 2 files changed, 86 insertions(+) create mode 100644 drivers/block/blksnap/sysfs.c create mode 100644 drivers/block/blksnap/sysfs.h diff --git a/drivers/block/blksnap/sysfs.c b/drivers/block/blksnap/sysfs.c new file mode 100644 index 000000000000..32a34609d106 --- /dev/null +++ b/drivers/block/blksnap/sysfs.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME "-sysfs: " fmt +#include +#include +#include +#include +#ifdef CONFIG_BLK_SNAP_DEBUG_MEMORY_LEAK +#include "memory_checker.h" +#endif +#include "sysfs.h" +#include "ctrl.h" + +static ssize_t major_show(struct class *class, struct class_attribute *attr, + char *buf) +{ + sprintf(buf, "%d", get_blk_snap_major()); + return strlen(buf); +} + +/* Declare class_attr_major */ +CLASS_ATTR_RO(major); + +static struct class *blk_snap_class; + +static struct device *blk_snap_device; + +int sysfs_init(void) +{ + struct device *dev; + int res; + + blk_snap_class = class_create(THIS_MODULE, BLK_SNAP_MODULE_NAME); + if (IS_ERR(blk_snap_class)) { + res = PTR_ERR(blk_snap_class); + + pr_err("Bad class create. errno=%d\n", abs(res)); + return res; + } + + pr_info("Create 'major' sysfs attribute\n"); + res = class_create_file(blk_snap_class, &class_attr_major); + if (res) { + pr_err("Failed to create 'major' sysfs file\n"); + + class_destroy(blk_snap_class); + blk_snap_class = NULL; + return res; + } + + dev = device_create(blk_snap_class, NULL, + MKDEV(get_blk_snap_major(), 0), NULL, + BLK_SNAP_MODULE_NAME); + if (IS_ERR(dev)) { + res = PTR_ERR(dev); + pr_err("Failed to create device, errno=%d\n", abs(res)); + + class_remove_file(blk_snap_class, &class_attr_major); + class_destroy(blk_snap_class); + blk_snap_class = NULL; + return res; + } + + blk_snap_device = dev; + return res; +} + +void sysfs_done(void) +{ + pr_info("Cleanup sysfs\n"); + + if (blk_snap_device) { + device_unregister(blk_snap_device); + blk_snap_device = NULL; + } + + if (blk_snap_class != NULL) { + class_remove_file(blk_snap_class, &class_attr_major); + class_destroy(blk_snap_class); + blk_snap_class = NULL; + } +} diff --git a/drivers/block/blksnap/sysfs.h b/drivers/block/blksnap/sysfs.h new file mode 100644 index 000000000000..b41c301fe33b --- /dev/null +++ b/drivers/block/blksnap/sysfs.h @@ -0,0 +1,5 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#pragma once + +int sysfs_init(void); +void sysfs_done(void);