From patchwork Fri Dec 9 14:23:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Shtepa X-Patchwork-Id: 13069668 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 EB5C7C4167B for ; Fri, 9 Dec 2022 14:49:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229626AbiLIOtN (ORCPT ); Fri, 9 Dec 2022 09:49:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229512AbiLIOtM (ORCPT ); Fri, 9 Dec 2022 09:49:12 -0500 Received: from mx4.veeam.com (mx4.veeam.com [104.41.138.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F179421A1; Fri, 9 Dec 2022 06:49:08 -0800 (PST) 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 714CE7D47F; Fri, 9 Dec 2022 17:24:08 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=veeam.com; s=mx4-2022; t=1670595848; bh=IOAnolxy3IZUwIcxvxaNi6nzmb8eykgwoZz1C5UIgjE=; h=From:To:CC:Subject:Date:In-Reply-To:References:From; b=ZXu6CQlf++EznsbpjRgeaAhxti9TExLR4MPvnUXsn3A+1ptKVR+BsrNq0PB0GRioJ InP/EelUtLTVuT4EvEcrxoOtRhg9cJ3TxAYoYs8SEOS4ot39ZALfNimMT1vf5YH+lM f9/u7b44cTMiag4sN7ipxtmQHBmqrKxM2NNiPA/uudr5QZUMhpF+GG8d79RzZZSDpn v+65Yh8wU/IzgH+NR45DZaeAmiTh0o4WST3+KtCKl3OLYz4vrFLnftQleIzQkFOOay qxAteUKdRjc8MbWHoAOrs19cnkjTS1kmuH7Y3PQqophJVrDBb/mMYWL2sDYNCwdDmz WQ91+Dcs0PVqQ== Received: from ssh-deb10-ssd-vb.amust.local (172.24.10.107) 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 15.2.1118.20; Fri, 9 Dec 2022 15:24:04 +0100 From: Sergei Shtepa To: , CC: , , , Sergei Shtepa Subject: [PATCH v2 08/21] block, blksnap: interaction with sysfs Date: Fri, 9 Dec 2022 15:23:18 +0100 Message-ID: <20221209142331.26395-9-sergei.shtepa@veeam.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221209142331.26395-1-sergei.shtepa@veeam.com> References: <20221209142331.26395-1-sergei.shtepa@veeam.com> MIME-Version: 1.0 X-Originating-IP: [172.24.10.107] X-ClientProxiedBy: prgmbx02.amust.local (172.24.128.103) To prgmbx01.amust.local (172.24.128.102) X-EsetResult: clean, is OK X-EsetId: 37303A2924031556627C62 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 | 80 +++++++++++++++++++++++++++++++++++ drivers/block/blksnap/sysfs.h | 7 +++ 2 files changed, 87 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..6f53c4217d6c --- /dev/null +++ b/drivers/block/blksnap/sysfs.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME "-sysfs: " fmt + +#include +#include +#include +#include +#include +#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_initialize(void) +{ + struct device *dev; + int res; + + blk_snap_class = class_create(THIS_MODULE, THIS_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, + THIS_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_finalize(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..5fc200d36789 --- /dev/null +++ b/drivers/block/blksnap/sysfs.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __BLK_SNAP_SYSFS_H +#define __BLK_SNAP_SYSFS_H + +int sysfs_initialize(void); +void sysfs_finalize(void); +#endif /* __BLK_SNAP_SYSFS_H */