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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 | 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 | 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 | } |