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 32 #include "ocfs2_nodemanager.h" 33 #include "masklog.h" 34 #include "sys.h" 35 36 struct o2cb_attribute { 37 struct attribute attr; 38 ssize_t (*show)(char *buf); 39 ssize_t (*store)(const char *buf, size_t count); 40 }; 41 42 #define O2CB_ATTR(_name, _mode, _show, _store) \ 43 struct o2cb_attribute o2cb_attr_##_name = __ATTR(_name, _mode, _show, _store) 44 45 #define to_o2cb_attr(_attr) container_of(_attr, struct o2cb_attribute, attr) 46 47 static ssize_t o2cb_interface_revision_show(char *buf) 48 { 49 return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION); 50 } 51 52 static O2CB_ATTR(interface_revision, S_IFREG | S_IRUGO, o2cb_interface_revision_show, NULL); 53 54 static struct attribute *o2cb_attrs[] = { 55 &o2cb_attr_interface_revision.attr, 56 NULL, 57 }; 58 59 static ssize_t 60 o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer); 61 static ssize_t 62 o2cb_store(struct kobject * kobj, struct attribute * attr, 63 const char * buffer, size_t count); 64 static struct sysfs_ops o2cb_sysfs_ops = { 65 .show = o2cb_show, 66 .store = o2cb_store, 67 }; 68 69 static struct kobj_type o2cb_subsys_type = { 70 .default_attrs = o2cb_attrs, 71 .sysfs_ops = &o2cb_sysfs_ops, 72 }; 73 74 /* gives us o2cb_subsys */ 75 static decl_subsys(o2cb, NULL, NULL); 76 77 static ssize_t 78 o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer) 79 { 80 struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr); 81 struct kset *sbs = to_kset(kobj); 82 83 BUG_ON(sbs != &o2cb_subsys); 84 85 if (o2cb_attr->show) 86 return o2cb_attr->show(buffer); 87 return -EIO; 88 } 89 90 static ssize_t 91 o2cb_store(struct kobject * kobj, struct attribute * attr, 92 const char * buffer, size_t count) 93 { 94 struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr); 95 struct kset *sbs = to_kset(kobj); 96 97 BUG_ON(sbs != &o2cb_subsys); 98 99 if (o2cb_attr->store) 100 return o2cb_attr->store(buffer, count); 101 return -EIO; 102 } 103 104 void o2cb_sys_shutdown(void) 105 { 106 mlog_sys_shutdown(); 107 subsystem_unregister(&o2cb_subsys); 108 } 109 110 int o2cb_sys_init(void) 111 { 112 int ret; 113 114 o2cb_subsys.kobj.ktype = &o2cb_subsys_type; 115 ret = subsystem_register(&o2cb_subsys); 116 if (ret) 117 return ret; 118 119 ret = mlog_sys_init(&o2cb_subsys); 120 if (ret) 121 subsystem_unregister(&o2cb_subsys); 122 return ret; 123 } 124