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_subsys(k) container_of(to_kset(k), struct subsystem, kset) 46 #define to_o2cb_attr(_attr) container_of(_attr, struct o2cb_attribute, attr) 47 48 static ssize_t o2cb_interface_revision_show(char *buf) 49 { 50 return snprintf(buf, PAGE_SIZE, "%u\n", O2NM_API_VERSION); 51 } 52 53 static O2CB_ATTR(interface_revision, S_IFREG | S_IRUGO, o2cb_interface_revision_show, NULL); 54 55 static struct attribute *o2cb_attrs[] = { 56 &o2cb_attr_interface_revision.attr, 57 NULL, 58 }; 59 60 static ssize_t 61 o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer); 62 static ssize_t 63 o2cb_store(struct kobject * kobj, struct attribute * attr, 64 const char * buffer, size_t count); 65 static struct sysfs_ops o2cb_sysfs_ops = { 66 .show = o2cb_show, 67 .store = o2cb_store, 68 }; 69 70 static struct kobj_type o2cb_subsys_type = { 71 .default_attrs = o2cb_attrs, 72 .sysfs_ops = &o2cb_sysfs_ops, 73 }; 74 75 /* gives us o2cb_subsys */ 76 static decl_subsys(o2cb, NULL, NULL); 77 78 static ssize_t 79 o2cb_show(struct kobject * kobj, struct attribute * attr, char * buffer) 80 { 81 struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr); 82 struct subsystem *sbs = to_o2cb_subsys(kobj); 83 84 BUG_ON(sbs != &o2cb_subsys); 85 86 if (o2cb_attr->show) 87 return o2cb_attr->show(buffer); 88 return -EIO; 89 } 90 91 static ssize_t 92 o2cb_store(struct kobject * kobj, struct attribute * attr, 93 const char * buffer, size_t count) 94 { 95 struct o2cb_attribute *o2cb_attr = to_o2cb_attr(attr); 96 struct subsystem *sbs = to_o2cb_subsys(kobj); 97 98 BUG_ON(sbs != &o2cb_subsys); 99 100 if (o2cb_attr->store) 101 return o2cb_attr->store(buffer, count); 102 return -EIO; 103 } 104 105 void o2cb_sys_shutdown(void) 106 { 107 mlog_sys_shutdown(); 108 subsystem_unregister(&o2cb_subsys); 109 } 110 111 int o2cb_sys_init(void) 112 { 113 int ret; 114 115 o2cb_subsys.kset.kobj.ktype = &o2cb_subsys_type; 116 ret = subsystem_register(&o2cb_subsys); 117 if (ret) 118 return ret; 119 120 ret = mlog_sys_init(&o2cb_subsys); 121 if (ret) 122 subsystem_unregister(&o2cb_subsys); 123 return ret; 124 } 125