ocfs2/cluster/sys.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * sys.c
0004  *
0005  * OCFS2 cluster sysfs interface
0006  *
0007  * Copyright (C) 2005 Oracle.  All rights reserved.
0008  */
0009
0010 #include <linux/kernel.h>
0011 #include <linux/module.h>
0012 #include <linux/kobject.h>
0013 #include <linux/sysfs.h>
0014 #include <linux/fs.h>
0015
0016 #include "ocfs2_nodemanager.h"
0017 #include "masklog.h"
0018 #include "sys.h"
0019
0020
0021 static ssize_t version_show(struct kobject *kobj, struct kobj_attribute *attr,
0022                 char *buf)
0023 {
0024     return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION);
0025 }
0026 static struct kobj_attribute attr_version =
0027     __ATTR(interface_revision, S_IRUGO, version_show, NULL);
0028
0029 static struct attribute *o2cb_attrs[] = {
0030     &attr_version.attr,
0031     NULL,
0032 };
0033
0034 static struct attribute_group o2cb_attr_group = {
0035     .attrs = o2cb_attrs,
0036 };
0037
0038 static struct kset *o2cb_kset;
0039
0040 void o2cb_sys_shutdown(void)
0041 {
0042     mlog_sys_shutdown();
0043     kset_unregister(o2cb_kset);
0044 }
0045
0046 int o2cb_sys_init(void)
0047 {
0048     int ret;
0049
0050     o2cb_kset = kset_create_and_add("o2cb", NULL, fs_kobj);
0051     if (!o2cb_kset)
0052         return -ENOMEM;
0053
0054     ret = sysfs_create_group(&o2cb_kset->kobj, &o2cb_attr_group);
0055     if (ret)
0056         goto error;
0057
0058     ret = mlog_sys_init(o2cb_kset);
0059     if (ret)
0060         goto error;
0061     return 0;
0062 error:
0063     kset_unregister(o2cb_kset);
0064     return ret;
0065 }