From patchwork Wed Nov 2 15:50:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Shtepa X-Patchwork-Id: 13028587 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 1C153C433FE for ; Wed, 2 Nov 2022 16:31:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231570AbiKBQbA (ORCPT ); Wed, 2 Nov 2022 12:31:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231406AbiKBQaa (ORCPT ); Wed, 2 Nov 2022 12:30:30 -0400 Received: from mx1.veeam.com (mx1.veeam.com [216.253.77.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91F9A2DAA1; Wed, 2 Nov 2022 09:27:08 -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 mx1.veeam.com (Postfix) with ESMTPS id 4FE044110A; Wed, 2 Nov 2022 11:51:59 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=veeam.com; s=mx1-2022; t=1667404319; bh=sMx+tCVloqWsGtoNfLLhf1sI9qkGg1iVULg5OTBOaq0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=dKq1trBqhdpSVVwhwlGqx3mWdVRskpehqCIH5W/BxBI75zCCOsk8kwj4R3Ku8SS+Q w2pUZT4un3jANT/3ZkQBq228XA1W0JDJLqMElBTYtkJmOnhYWZjyYofXVpUiaDTE6L scOuDSgOCipWst72qNyGsZnw6Sou2Esg5wKATEs13hrn0lFsGm2x2fvD6nEnLLNroc Xyy83eztwmBEb2UqaseWh6f7xp+uxVdY9iQ4hsVxxrFTKaOZrQ1qNEcqbW49QXwJwL OlVQhZIHNQDN4A8cmIkbFcvXL/aMA6Nv8B6eATEjJljUiFtQDDTEpSiRehwEH6VYRD 3J40Adw6nM52w== 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 15.2.1118.12; Wed, 2 Nov 2022 16:51:21 +0100 From: Sergei Shtepa To: , , , , Subject: [PATCH v1 05/17] block, blksnap: interaction with sysfs Date: Wed, 2 Nov 2022 16:50:49 +0100 Message-ID: <20221102155101.4550-6-sergei.shtepa@veeam.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221102155101.4550-1-sergei.shtepa@veeam.com> References: <20221102155101.4550-1-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: 37303A292403155666726A 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 | 79 +++++++++++++++++++++++++++++++++++ drivers/block/blksnap/sysfs.h | 7 ++++ 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..fd20336a14c7 --- /dev/null +++ b/drivers/block/blksnap/sysfs.c @@ -0,0 +1,79 @@ +// 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_init(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_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..66ce9d1509af --- /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_init(void); +void sysfs_done(void); +#endif /* __BLK_SNAP_SYSFS_H */