Merge git://git.infradead.org/~dwmw2/cafe-2.6
[linux-2.6] / fs / gfs2 / locking / dlm / sysfs.c
1 /*
2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
3  * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
4  *
5  * This copyrighted material is made available to anyone wishing to use,
6  * modify, copy, or redistribute it subject to the terms and conditions
7  * of the GNU General Public License version 2.
8  */
9
10 #include <linux/ctype.h>
11 #include <linux/stat.h>
12
13 #include "lock_dlm.h"
14
15 extern struct lm_lockops gdlm_ops;
16
17 static ssize_t proto_name_show(struct gdlm_ls *ls, char *buf)
18 {
19         return sprintf(buf, "%s\n", gdlm_ops.lm_proto_name);
20 }
21
22 static ssize_t block_show(struct gdlm_ls *ls, char *buf)
23 {
24         ssize_t ret;
25         int val = 0;
26
27         if (test_bit(DFL_BLOCK_LOCKS, &ls->flags))
28                 val = 1;
29         ret = sprintf(buf, "%d\n", val);
30         return ret;
31 }
32
33 static ssize_t block_store(struct gdlm_ls *ls, const char *buf, size_t len)
34 {
35         ssize_t ret = len;
36         int val;
37
38         val = simple_strtol(buf, NULL, 0);
39
40         if (val == 1)
41                 set_bit(DFL_BLOCK_LOCKS, &ls->flags);
42         else if (val == 0) {
43                 clear_bit(DFL_BLOCK_LOCKS, &ls->flags);
44                 gdlm_submit_delayed(ls);
45         } else {
46                 ret = -EINVAL;
47         }
48         return ret;
49 }
50
51 static ssize_t withdraw_show(struct gdlm_ls *ls, char *buf)
52 {
53         ssize_t ret;
54         int val = 0;
55
56         if (test_bit(DFL_WITHDRAW, &ls->flags))
57                 val = 1;
58         ret = sprintf(buf, "%d\n", val);
59         return ret;
60 }
61
62 static ssize_t withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
63 {
64         ssize_t ret = len;
65         int val;
66
67         val = simple_strtol(buf, NULL, 0);
68
69         if (val == 1)
70                 set_bit(DFL_WITHDRAW, &ls->flags);
71         else
72                 ret = -EINVAL;
73         wake_up(&ls->wait_control);
74         return ret;
75 }
76
77 static ssize_t id_show(struct gdlm_ls *ls, char *buf)
78 {
79         return sprintf(buf, "%u\n", ls->id);
80 }
81
82 static ssize_t jid_show(struct gdlm_ls *ls, char *buf)
83 {
84         return sprintf(buf, "%d\n", ls->jid);
85 }
86
87 static ssize_t first_show(struct gdlm_ls *ls, char *buf)
88 {
89         return sprintf(buf, "%d\n", ls->first);
90 }
91
92 static ssize_t first_done_show(struct gdlm_ls *ls, char *buf)
93 {
94         return sprintf(buf, "%d\n", ls->first_done);
95 }
96
97 static ssize_t recover_show(struct gdlm_ls *ls, char *buf)
98 {
99         return sprintf(buf, "%d\n", ls->recover_jid);
100 }
101
102 static ssize_t recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
103 {
104         ls->recover_jid = simple_strtol(buf, NULL, 0);
105         ls->fscb(ls->sdp, LM_CB_NEED_RECOVERY, &ls->recover_jid);
106         return len;
107 }
108
109 static ssize_t recover_done_show(struct gdlm_ls *ls, char *buf)
110 {
111         return sprintf(buf, "%d\n", ls->recover_jid_done);
112 }
113
114 static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
115 {
116         return sprintf(buf, "%d\n", ls->recover_jid_status);
117 }
118
119 struct gdlm_attr {
120         struct attribute attr;
121         ssize_t (*show)(struct gdlm_ls *, char *);
122         ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
123 };
124
125 #define GDLM_ATTR(_name,_mode,_show,_store) \
126 static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
127
128 GDLM_ATTR(proto_name,     0444, proto_name_show,     NULL);
129 GDLM_ATTR(block,          0644, block_show,          block_store);
130 GDLM_ATTR(withdraw,       0644, withdraw_show,       withdraw_store);
131 GDLM_ATTR(id,             0444, id_show,             NULL);
132 GDLM_ATTR(jid,            0444, jid_show,            NULL);
133 GDLM_ATTR(first,          0444, first_show,          NULL);
134 GDLM_ATTR(first_done,     0444, first_done_show,     NULL);
135 GDLM_ATTR(recover,        0644, recover_show,        recover_store);
136 GDLM_ATTR(recover_done,   0444, recover_done_show,   NULL);
137 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
138
139 static struct attribute *gdlm_attrs[] = {
140         &gdlm_attr_proto_name.attr,
141         &gdlm_attr_block.attr,
142         &gdlm_attr_withdraw.attr,
143         &gdlm_attr_id.attr,
144         &gdlm_attr_jid.attr,
145         &gdlm_attr_first.attr,
146         &gdlm_attr_first_done.attr,
147         &gdlm_attr_recover.attr,
148         &gdlm_attr_recover_done.attr,
149         &gdlm_attr_recover_status.attr,
150         NULL,
151 };
152
153 static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
154                               char *buf)
155 {
156         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
157         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
158         return a->show ? a->show(ls, buf) : 0;
159 }
160
161 static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
162                                const char *buf, size_t len)
163 {
164         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
165         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
166         return a->store ? a->store(ls, buf, len) : len;
167 }
168
169 static struct sysfs_ops gdlm_attr_ops = {
170         .show  = gdlm_attr_show,
171         .store = gdlm_attr_store,
172 };
173
174 static struct kobj_type gdlm_ktype = {
175         .default_attrs = gdlm_attrs,
176         .sysfs_ops     = &gdlm_attr_ops,
177 };
178
179 static struct kset gdlm_kset = {
180         .subsys = &kernel_subsys,
181         .kobj   = {.name = "lock_dlm",},
182         .ktype  = &gdlm_ktype,
183 };
184
185 int gdlm_kobject_setup(struct gdlm_ls *ls, struct kobject *fskobj)
186 {
187         int error;
188
189         error = kobject_set_name(&ls->kobj, "%s", "lock_module");
190         if (error) {
191                 log_error("can't set kobj name %d", error);
192                 return error;
193         }
194
195         ls->kobj.kset = &gdlm_kset;
196         ls->kobj.ktype = &gdlm_ktype;
197         ls->kobj.parent = fskobj;
198
199         error = kobject_register(&ls->kobj);
200         if (error)
201                 log_error("can't register kobj %d", error);
202
203         return error;
204 }
205
206 void gdlm_kobject_release(struct gdlm_ls *ls)
207 {
208         kobject_unregister(&ls->kobj);
209 }
210
211 int gdlm_sysfs_init(void)
212 {
213         int error;
214
215         error = kset_register(&gdlm_kset);
216         if (error)
217                 printk("lock_dlm: cannot register kset %d\n", error);
218
219         return error;
220 }
221
222 void gdlm_sysfs_exit(void)
223 {
224         kset_unregister(&gdlm_kset);
225 }
226