1/* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * sys.c 5 * 6 * OCFS2 cluster sysfs interface 7 * 8 * Copyright (C) 2005 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation, 13 * version 2 of the License. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 * 25 */ 26 27#include <linux/kernel.h> 28#include <linux/module.h> 29#include <linux/kobject.h> 30#include <linux/sysfs.h> 31#include <linux/fs.h> 32 33#include "ocfs2_nodemanager.h" 34#include "masklog.h" 35#include "sys.h" 36 37 38static ssize_t version_show(struct kobject *kobj, struct kobj_attribute *attr, 39 char *buf) 40{ 41 return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION); 42} 43static struct kobj_attribute attr_version = 44 __ATTR(interface_revision, S_IFREG | S_IRUGO, version_show, NULL); 45 46static struct attribute *o2cb_attrs[] = { 47 &attr_version.attr, 48 NULL, 49}; 50 51static struct attribute_group o2cb_attr_group = { 52 .attrs = o2cb_attrs, 53}; 54 55static struct kset *o2cb_kset; 56 57void o2cb_sys_shutdown(void) 58{ 59 mlog_sys_shutdown(); 60 sysfs_remove_link(NULL, "o2cb"); 61 kset_unregister(o2cb_kset); 62} 63 64int o2cb_sys_init(void) 65{ 66 int ret; 67 68 o2cb_kset = kset_create_and_add("o2cb", NULL, fs_kobj); 69 if (!o2cb_kset) 70 return -ENOMEM; 71 72 /* 73 * Create this symlink for backwards compatibility with old 74 * versions of ocfs2-tools which look for things in /sys/o2cb. 75 */ 76 ret = sysfs_create_link(NULL, &o2cb_kset->kobj, "o2cb"); 77 if (ret) 78 goto error; 79 80 ret = sysfs_create_group(&o2cb_kset->kobj, &o2cb_attr_group); 81 if (ret) 82 goto error; 83 84 ret = mlog_sys_init(o2cb_kset); 85 if (ret) 86 goto error; 87 return 0; 88error: 89 kset_unregister(o2cb_kset); 90 return ret; 91} 92