LXR linux/fs/ocfs2/cluster/sys.c

   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