fs/ocfs2/cluster/sys.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * sys.c
   6  *
   7  * OCFS2 cluster sysfs interface
   8  *
   9  * Copyright (C) 2005 Oracle.  All rights reserved.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/kobject.h>
  15 #include <linux/sysfs.h>
  16 #include <linux/fs.h>
  17
  18 #include "ocfs2_nodemanager.h"
  19 #include "masklog.h"
  20 #include "sys.h"
  21
  22
  23 static ssize_t version_show(struct kobject *kobj, struct kobj_attribute *attr,
  24                             char *buf)
  25 {
  26         return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION);
  27 }
  28 static struct kobj_attribute attr_version =
  29         __ATTR(interface_revision, S_IRUGO, version_show, NULL);
  30
  31 static struct attribute *o2cb_attrs[] = {
  32         &attr_version.attr,
  33         NULL,
  34 };
  35
  36 static struct attribute_group o2cb_attr_group = {
  37         .attrs = o2cb_attrs,
  38 };
  39
  40 static struct kset *o2cb_kset;
  41
  42 void o2cb_sys_shutdown(void)
  43 {
  44         mlog_sys_shutdown();
  45         kset_unregister(o2cb_kset);
  46 }
  47
  48 int o2cb_sys_init(void)
  49 {
  50         int ret;
  51
  52         o2cb_kset = kset_create_and_add("o2cb", NULL, fs_kobj);
  53         if (!o2cb_kset)
  54                 return -ENOMEM;
  55
  56         ret = sysfs_create_group(&o2cb_kset->kobj, &o2cb_attr_group);
  57         if (ret)
  58                 goto error;
  59
  60         ret = mlog_sys_init(o2cb_kset);
  61         if (ret)
  62                 goto error;
  63         return 0;
  64 error:
  65         kset_unregister(o2cb_kset);
  66         return ret;
  67 }