1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*/
#include "lock_dlm.h"
int gdlm_drop_count;
int gdlm_drop_period;
struct lm_lockops gdlm_ops;
static struct gdlm_ls *init_gdlm(lm_callback_t cb, lm_fsdata_t *fsdata,
int flags, char *table_name)
{
struct gdlm_ls *ls;
char buf[256], *p;
ls = kzalloc(sizeof(struct gdlm_ls), GFP_KERNEL);
if (!ls)
return NULL;
ls->drop_locks_count = gdlm_drop_count;
ls->drop_locks_period = gdlm_drop_period;
ls->fscb = cb;
ls->fsdata = fsdata;
ls->fsflags = flags;
spin_lock_init(&ls->async_lock);
INIT_LIST_HEAD(&ls->complete);
INIT_LIST_HEAD(&ls->blocking);
INIT_LIST_HEAD(&ls->delayed);
INIT_LIST_HEAD(&ls->submit);
INIT_LIST_HEAD(&ls->all_locks);
init_waitqueue_head(&ls->thread_wait);
init_waitqueue_head(&ls->wait_control);
ls->thread1 = NULL;
ls->thread2 = NULL;
ls->drop_time = jiffies;
ls->jid = -1;
strncpy(buf, table_name, 256);
buf[255] = '\0';
p = strstr(buf, ":");
if (!p) {
log_info("invalid table_name \"%s\"", table_name);
kfree(ls);
return NULL;
}
*p = '\0';
p++;
strncpy(ls->clustername, buf, GDLM_NAME_LEN);
strncpy(ls->fsname, p, GDLM_NAME_LEN);
return ls;
}
static int make_args(struct gdlm_ls *ls, char *data_arg)
{
char data[256];
char *options, *x, *y;
int error = 0;
memset(data, 0, 256);
strncpy(data, data_arg, 255);
for (options = data; (x = strsep(&options, ":")); ) {
if (!*x)
continue;
y = strchr(x, '=');
if (y)
*y++ = 0;
if (!strcmp(x, "jid")) {
if (!y) {
log_error("need argument to jid");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->jid);
} else if (!strcmp(x, "first")) {
if (!y) {
log_error("need argument to first");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->first);
} else if (!strcmp(x, "id")) {
if (!y) {
log_error("need argument to id");
error = -EINVAL;
break;
}
sscanf(y, "%u", &ls->id);
} else {
log_error("unkonwn option: %s", x);
error = -EINVAL;
break;
}
}
return error;
}
static int gdlm_mount(char *table_name, char *host_data,
lm_callback_t cb, lm_fsdata_t *fsdata,
unsigned int min_lvb_size, int flags,
struct lm_lockstruct *lockstruct,
struct kobject *fskobj)
{
struct gdlm_ls *ls;
int error = -ENOMEM;
if (min_lvb_size > GDLM_LVB_SIZE)
goto out;
ls = init_gdlm(cb, fsdata, flags, table_name);
if (!ls)
goto out;
error = gdlm_init_threads(ls);
if (error)
goto out_free;
error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
&ls->dlm_lockspace, 0, GDLM_LVB_SIZE);
if (error) {
log_error("dlm_new_lockspace error %d", error);
goto out_thread;
}
error = gdlm_kobject_setup(ls, fskobj);
if (error)
goto out_dlm;
error = make_args(ls, host_data);
if (error)
goto out_sysfs;
lockstruct->ls_jid = ls->jid;
lockstruct->ls_first = ls->first;
lockstruct->ls_lockspace = ls;
lockstruct->ls_ops = &gdlm_ops;
lockstruct->ls_flags = 0;
lockstruct->ls_lvb_size = GDLM_LVB_SIZE;
return 0;
out_sysfs:
gdlm_kobject_release(ls);
out_dlm:
dlm_release_lockspace(ls->dlm_lockspace, 2);
out_thread:
gdlm_release_threads(ls);
out_free:
kfree(ls);
out:
return error;
}
static void gdlm_unmount(lm_lockspace_t *lockspace)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
int rv;
log_debug("unmount flags %lx", ls->flags);
/* FIXME: serialize unmount and withdraw in case they
happen at once. Also, if unmount follows withdraw,
wait for withdraw to finish. */
if (test_bit(DFL_WITHDRAW, &ls->flags))
goto out;
gdlm_kobject_release(ls);
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
rv = gdlm_release_all_locks(ls);
if (rv)
log_info("gdlm_unmount: %d stray locks freed", rv);
out:
kfree(ls);
}
static void gdlm_recovery_done(lm_lockspace_t *lockspace, unsigned int jid,
unsigned int message)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
ls->recover_jid_done = jid;
kobject_uevent(&ls->kobj, KOBJ_CHANGE);
}
static void gdlm_others_may_mount(lm_lockspace_t *lockspace)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
ls->first_done = 1;
kobject_uevent(&ls->kobj, KOBJ_CHANGE);
}
/* Userspace gets the offline uevent, blocks new gfs locks on
other mounters, and lets us know (sets WITHDRAW flag). Then,
userspace leaves the mount group while we leave the lockspace. */
static void gdlm_withdraw(lm_lockspace_t *lockspace)
{
struct gdlm_ls *ls = (struct gdlm_ls *) lockspace;
kobject_uevent(&ls->kobj, KOBJ_OFFLINE);
wait_event_interruptible(ls->wait_control,
test_bit(DFL_WITHDRAW, &ls->flags));
dlm_release_lockspace(ls->dlm_lockspace, 2);
gdlm_release_threads(ls);
gdlm_release_all_locks(ls);
gdlm_kobject_release(ls);
}
struct lm_lockops gdlm_ops = {
.lm_proto_name = "lock_dlm",
.lm_mount = gdlm_mount,
.lm_others_may_mount = gdlm_others_may_mount,
.lm_unmount = gdlm_unmount,
.lm_withdraw = gdlm_withdraw,
.lm_get_lock = gdlm_get_lock,
.lm_put_lock = gdlm_put_lock,
.lm_lock = gdlm_lock,
.lm_unlock = gdlm_unlock,
.lm_plock = gdlm_plock,
.lm_punlock = gdlm_punlock,
.lm_plock_get = gdlm_plock_get,
.lm_cancel = gdlm_cancel,
.lm_hold_lvb = gdlm_hold_lvb,
.lm_unhold_lvb = gdlm_unhold_lvb,
.lm_sync_lvb = gdlm_sync_lvb,
.lm_recovery_done = gdlm_recovery_done,
.lm_owner = THIS_MODULE,
};
|
