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24ef1815 JB |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * stackglue.c | |
5 | * | |
6 | * Code which implements an OCFS2 specific interface to underlying | |
7 | * cluster stacks. | |
8 | * | |
9 | * Copyright (C) 2007 Oracle. All rights reserved. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public | |
13 | * License as published by the Free Software Foundation, version 2. | |
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 | ||
286eaa95 JB |
21 | #include <linux/list.h> |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/module.h> | |
4670c46d | 24 | #include <linux/slab.h> |
6953b4c0 | 25 | #include <linux/kmod.h> |
74ae4e10 JB |
26 | #include <linux/fs.h> |
27 | #include <linux/kobject.h> | |
28 | #include <linux/sysfs.h> | |
3878f110 | 29 | #include <linux/sysctl.h> |
4670c46d | 30 | |
9c6c877c JB |
31 | #include "ocfs2_fs.h" |
32 | ||
286eaa95 | 33 | #include "stackglue.h" |
4670c46d | 34 | |
9c6c877c JB |
35 | #define OCFS2_STACK_PLUGIN_O2CB "o2cb" |
36 | #define OCFS2_STACK_PLUGIN_USER "user" | |
37 | ||
286eaa95 JB |
38 | static struct ocfs2_locking_protocol *lproto; |
39 | static DEFINE_SPINLOCK(ocfs2_stack_lock); | |
40 | static LIST_HEAD(ocfs2_stack_list); | |
9c6c877c | 41 | static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1]; |
19fdb624 | 42 | |
286eaa95 JB |
43 | /* |
44 | * The stack currently in use. If not null, active_stack->sp_count > 0, | |
45 | * the module is pinned, and the locking protocol cannot be changed. | |
46 | */ | |
47 | static struct ocfs2_stack_plugin *active_stack; | |
48 | ||
49 | static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name) | |
50 | { | |
51 | struct ocfs2_stack_plugin *p; | |
52 | ||
53 | assert_spin_locked(&ocfs2_stack_lock); | |
54 | ||
55 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
56 | if (!strcmp(p->sp_name, name)) | |
57 | return p; | |
58 | } | |
59 | ||
60 | return NULL; | |
61 | } | |
62 | ||
9c6c877c JB |
63 | static int ocfs2_stack_driver_request(const char *stack_name, |
64 | const char *plugin_name) | |
286eaa95 JB |
65 | { |
66 | int rc; | |
67 | struct ocfs2_stack_plugin *p; | |
68 | ||
69 | spin_lock(&ocfs2_stack_lock); | |
70 | ||
9c6c877c JB |
71 | /* |
72 | * If the stack passed by the filesystem isn't the selected one, | |
73 | * we can't continue. | |
74 | */ | |
75 | if (strcmp(stack_name, cluster_stack_name)) { | |
76 | rc = -EBUSY; | |
77 | goto out; | |
78 | } | |
79 | ||
286eaa95 JB |
80 | if (active_stack) { |
81 | /* | |
82 | * If the active stack isn't the one we want, it cannot | |
83 | * be selected right now. | |
84 | */ | |
9c6c877c | 85 | if (!strcmp(active_stack->sp_name, plugin_name)) |
286eaa95 JB |
86 | rc = 0; |
87 | else | |
88 | rc = -EBUSY; | |
89 | goto out; | |
90 | } | |
91 | ||
9c6c877c | 92 | p = ocfs2_stack_lookup(plugin_name); |
286eaa95 JB |
93 | if (!p || !try_module_get(p->sp_owner)) { |
94 | rc = -ENOENT; | |
95 | goto out; | |
96 | } | |
97 | ||
98 | /* Ok, the stack is pinned */ | |
99 | p->sp_count++; | |
100 | active_stack = p; | |
101 | ||
102 | rc = 0; | |
103 | ||
104 | out: | |
105 | spin_unlock(&ocfs2_stack_lock); | |
106 | return rc; | |
107 | } | |
108 | ||
109 | /* | |
110 | * This function looks up the appropriate stack and makes it active. If | |
111 | * there is no stack, it tries to load it. It will fail if the stack still | |
112 | * cannot be found. It will also fail if a different stack is in use. | |
113 | */ | |
9c6c877c | 114 | static int ocfs2_stack_driver_get(const char *stack_name) |
286eaa95 JB |
115 | { |
116 | int rc; | |
9c6c877c JB |
117 | char *plugin_name = OCFS2_STACK_PLUGIN_O2CB; |
118 | ||
119 | /* | |
120 | * Classic stack does not pass in a stack name. This is | |
121 | * compatible with older tools as well. | |
122 | */ | |
123 | if (!stack_name || !*stack_name) | |
124 | stack_name = OCFS2_STACK_PLUGIN_O2CB; | |
125 | ||
126 | if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) { | |
127 | printk(KERN_ERR | |
128 | "ocfs2 passed an invalid cluster stack label: \"%s\"\n", | |
129 | stack_name); | |
130 | return -EINVAL; | |
131 | } | |
286eaa95 | 132 | |
9c6c877c JB |
133 | /* Anything that isn't the classic stack is a user stack */ |
134 | if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB)) | |
135 | plugin_name = OCFS2_STACK_PLUGIN_USER; | |
136 | ||
137 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 | 138 | if (rc == -ENOENT) { |
9c6c877c JB |
139 | request_module("ocfs2_stack_%s", plugin_name); |
140 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 JB |
141 | } |
142 | ||
143 | if (rc == -ENOENT) { | |
144 | printk(KERN_ERR | |
145 | "ocfs2: Cluster stack driver \"%s\" cannot be found\n", | |
9c6c877c | 146 | plugin_name); |
286eaa95 JB |
147 | } else if (rc == -EBUSY) { |
148 | printk(KERN_ERR | |
9c6c877c | 149 | "ocfs2: A different cluster stack is in use\n"); |
286eaa95 JB |
150 | } |
151 | ||
152 | return rc; | |
153 | } | |
24ef1815 | 154 | |
286eaa95 JB |
155 | static void ocfs2_stack_driver_put(void) |
156 | { | |
157 | spin_lock(&ocfs2_stack_lock); | |
158 | BUG_ON(active_stack == NULL); | |
159 | BUG_ON(active_stack->sp_count == 0); | |
160 | ||
161 | active_stack->sp_count--; | |
162 | if (!active_stack->sp_count) { | |
163 | module_put(active_stack->sp_owner); | |
164 | active_stack = NULL; | |
165 | } | |
166 | spin_unlock(&ocfs2_stack_lock); | |
167 | } | |
168 | ||
169 | int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin) | |
170 | { | |
171 | int rc; | |
172 | ||
173 | spin_lock(&ocfs2_stack_lock); | |
174 | if (!ocfs2_stack_lookup(plugin->sp_name)) { | |
175 | plugin->sp_count = 0; | |
176 | plugin->sp_proto = lproto; | |
177 | list_add(&plugin->sp_list, &ocfs2_stack_list); | |
178 | printk(KERN_INFO "ocfs2: Registered cluster interface %s\n", | |
179 | plugin->sp_name); | |
180 | rc = 0; | |
181 | } else { | |
182 | printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n", | |
183 | plugin->sp_name); | |
184 | rc = -EEXIST; | |
185 | } | |
186 | spin_unlock(&ocfs2_stack_lock); | |
187 | ||
188 | return rc; | |
189 | } | |
190 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register); | |
191 | ||
192 | void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin) | |
193 | { | |
194 | struct ocfs2_stack_plugin *p; | |
195 | ||
196 | spin_lock(&ocfs2_stack_lock); | |
197 | p = ocfs2_stack_lookup(plugin->sp_name); | |
198 | if (p) { | |
199 | BUG_ON(p != plugin); | |
200 | BUG_ON(plugin == active_stack); | |
201 | BUG_ON(plugin->sp_count != 0); | |
202 | list_del_init(&plugin->sp_list); | |
203 | printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n", | |
204 | plugin->sp_name); | |
205 | } else { | |
206 | printk(KERN_ERR "Stack \"%s\" is not registered\n", | |
207 | plugin->sp_name); | |
208 | } | |
209 | spin_unlock(&ocfs2_stack_lock); | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister); | |
212 | ||
213 | void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto) | |
214 | { | |
215 | struct ocfs2_stack_plugin *p; | |
216 | ||
217 | BUG_ON(proto == NULL); | |
218 | ||
219 | spin_lock(&ocfs2_stack_lock); | |
220 | BUG_ON(active_stack != NULL); | |
221 | ||
222 | lproto = proto; | |
223 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
224 | p->sp_proto = lproto; | |
225 | } | |
226 | ||
227 | spin_unlock(&ocfs2_stack_lock); | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_locking_protocol); | |
7431cd7e | 230 | |
24ef1815 | 231 | |
cf4d8d75 DT |
232 | /* |
233 | * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take | |
234 | * "struct ocfs2_lock_res *astarg" instead of "void *astarg" because the | |
235 | * underlying stack plugins need to pilfer the lksb off of the lock_res. | |
236 | * If some other structure needs to be passed as an astarg, the plugins | |
237 | * will need to be given a different avenue to the lksb. | |
238 | */ | |
553aa7e4 JB |
239 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
240 | int mode, | |
241 | union ocfs2_dlm_lksb *lksb, | |
242 | u32 flags, | |
243 | void *name, | |
244 | unsigned int namelen, | |
cf4d8d75 | 245 | struct ocfs2_lock_res *astarg) |
553aa7e4 | 246 | { |
286eaa95 | 247 | BUG_ON(lproto == NULL); |
bd3e7610 | 248 | |
286eaa95 JB |
249 | return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
250 | name, namelen, astarg); | |
24ef1815 | 251 | } |
286eaa95 | 252 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
24ef1815 | 253 | |
553aa7e4 JB |
254 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
255 | union ocfs2_dlm_lksb *lksb, | |
256 | u32 flags, | |
cf4d8d75 | 257 | struct ocfs2_lock_res *astarg) |
553aa7e4 | 258 | { |
286eaa95 | 259 | BUG_ON(lproto == NULL); |
553aa7e4 | 260 | |
286eaa95 | 261 | return active_stack->sp_ops->dlm_unlock(conn, lksb, flags, astarg); |
8f2c9c1b | 262 | } |
286eaa95 | 263 | EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
8f2c9c1b | 264 | |
553aa7e4 JB |
265 | int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb) |
266 | { | |
286eaa95 | 267 | return active_stack->sp_ops->lock_status(lksb); |
553aa7e4 | 268 | } |
286eaa95 | 269 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
553aa7e4 | 270 | |
8f2c9c1b JB |
271 | /* |
272 | * Why don't we cast to ocfs2_meta_lvb? The "clean" answer is that we | |
273 | * don't cast at the glue level. The real answer is that the header | |
274 | * ordering is nigh impossible. | |
275 | */ | |
553aa7e4 JB |
276 | void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb) |
277 | { | |
286eaa95 | 278 | return active_stack->sp_ops->lock_lvb(lksb); |
cf0acdcd | 279 | } |
286eaa95 | 280 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
cf0acdcd | 281 | |
553aa7e4 JB |
282 | void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb) |
283 | { | |
286eaa95 | 284 | active_stack->sp_ops->dump_lksb(lksb); |
553aa7e4 | 285 | } |
286eaa95 | 286 | EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
553aa7e4 | 287 | |
9c6c877c JB |
288 | int ocfs2_cluster_connect(const char *stack_name, |
289 | const char *group, | |
4670c46d JB |
290 | int grouplen, |
291 | void (*recovery_handler)(int node_num, | |
292 | void *recovery_data), | |
293 | void *recovery_data, | |
294 | struct ocfs2_cluster_connection **conn) | |
295 | { | |
296 | int rc = 0; | |
297 | struct ocfs2_cluster_connection *new_conn; | |
4670c46d JB |
298 | |
299 | BUG_ON(group == NULL); | |
300 | BUG_ON(conn == NULL); | |
301 | BUG_ON(recovery_handler == NULL); | |
302 | ||
303 | if (grouplen > GROUP_NAME_MAX) { | |
304 | rc = -EINVAL; | |
305 | goto out; | |
306 | } | |
307 | ||
308 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), | |
309 | GFP_KERNEL); | |
310 | if (!new_conn) { | |
311 | rc = -ENOMEM; | |
312 | goto out; | |
313 | } | |
314 | ||
315 | memcpy(new_conn->cc_name, group, grouplen); | |
316 | new_conn->cc_namelen = grouplen; | |
317 | new_conn->cc_recovery_handler = recovery_handler; | |
318 | new_conn->cc_recovery_data = recovery_data; | |
319 | ||
320 | /* Start the new connection at our maximum compatibility level */ | |
286eaa95 JB |
321 | new_conn->cc_version = lproto->lp_max_version; |
322 | ||
323 | /* This will pin the stack driver if successful */ | |
9c6c877c | 324 | rc = ocfs2_stack_driver_get(stack_name); |
286eaa95 JB |
325 | if (rc) |
326 | goto out_free; | |
4670c46d | 327 | |
286eaa95 | 328 | rc = active_stack->sp_ops->connect(new_conn); |
553aa7e4 | 329 | if (rc) { |
286eaa95 | 330 | ocfs2_stack_driver_put(); |
4670c46d JB |
331 | goto out_free; |
332 | } | |
333 | ||
4670c46d JB |
334 | *conn = new_conn; |
335 | ||
336 | out_free: | |
553aa7e4 | 337 | if (rc) |
4670c46d | 338 | kfree(new_conn); |
4670c46d JB |
339 | |
340 | out: | |
341 | return rc; | |
342 | } | |
286eaa95 | 343 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
4670c46d | 344 | |
286eaa95 JB |
345 | /* If hangup_pending is 0, the stack driver will be dropped */ |
346 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, | |
347 | int hangup_pending) | |
553aa7e4 JB |
348 | { |
349 | int ret; | |
350 | ||
351 | BUG_ON(conn == NULL); | |
352 | ||
286eaa95 | 353 | ret = active_stack->sp_ops->disconnect(conn, hangup_pending); |
553aa7e4 JB |
354 | |
355 | /* XXX Should we free it anyway? */ | |
286eaa95 | 356 | if (!ret) { |
553aa7e4 | 357 | kfree(conn); |
286eaa95 JB |
358 | if (!hangup_pending) |
359 | ocfs2_stack_driver_put(); | |
360 | } | |
553aa7e4 JB |
361 | |
362 | return ret; | |
363 | } | |
286eaa95 | 364 | EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
553aa7e4 | 365 | |
6953b4c0 JB |
366 | void ocfs2_cluster_hangup(const char *group, int grouplen) |
367 | { | |
368 | BUG_ON(group == NULL); | |
369 | BUG_ON(group[grouplen] != '\0'); | |
370 | ||
cf4d8d75 DT |
371 | if (active_stack->sp_ops->hangup) |
372 | active_stack->sp_ops->hangup(group, grouplen); | |
286eaa95 JB |
373 | |
374 | /* cluster_disconnect() was called with hangup_pending==1 */ | |
375 | ocfs2_stack_driver_put(); | |
19fdb624 | 376 | } |
286eaa95 | 377 | EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
19fdb624 | 378 | |
553aa7e4 JB |
379 | int ocfs2_cluster_this_node(unsigned int *node) |
380 | { | |
286eaa95 | 381 | return active_stack->sp_ops->this_node(node); |
553aa7e4 | 382 | } |
286eaa95 | 383 | EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
553aa7e4 | 384 | |
286eaa95 | 385 | |
74ae4e10 JB |
386 | /* |
387 | * Sysfs bits | |
388 | */ | |
389 | ||
390 | static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, | |
391 | struct kobj_attribute *attr, | |
392 | char *buf) | |
393 | { | |
394 | ssize_t ret = 0; | |
395 | ||
396 | spin_lock(&ocfs2_stack_lock); | |
397 | if (lproto) | |
398 | ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", | |
399 | lproto->lp_max_version.pv_major, | |
400 | lproto->lp_max_version.pv_minor); | |
401 | spin_unlock(&ocfs2_stack_lock); | |
402 | ||
403 | return ret; | |
404 | } | |
405 | ||
406 | static struct kobj_attribute ocfs2_attr_max_locking_protocol = | |
407 | __ATTR(max_locking_protocol, S_IFREG | S_IRUGO, | |
408 | ocfs2_max_locking_protocol_show, NULL); | |
409 | ||
410 | static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, | |
411 | struct kobj_attribute *attr, | |
412 | char *buf) | |
24ef1815 | 413 | { |
74ae4e10 JB |
414 | ssize_t ret = 0, total = 0, remain = PAGE_SIZE; |
415 | struct ocfs2_stack_plugin *p; | |
416 | ||
417 | spin_lock(&ocfs2_stack_lock); | |
418 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
419 | ret = snprintf(buf, remain, "%s\n", | |
420 | p->sp_name); | |
421 | if (ret < 0) { | |
422 | total = ret; | |
423 | break; | |
424 | } | |
425 | if (ret == remain) { | |
426 | /* snprintf() didn't fit */ | |
427 | total = -E2BIG; | |
428 | break; | |
429 | } | |
430 | total += ret; | |
431 | remain -= ret; | |
432 | } | |
433 | spin_unlock(&ocfs2_stack_lock); | |
434 | ||
435 | return total; | |
436 | } | |
437 | ||
438 | static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = | |
439 | __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO, | |
440 | ocfs2_loaded_cluster_plugins_show, NULL); | |
441 | ||
442 | static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, | |
443 | struct kobj_attribute *attr, | |
444 | char *buf) | |
445 | { | |
446 | ssize_t ret = 0; | |
447 | ||
448 | spin_lock(&ocfs2_stack_lock); | |
449 | if (active_stack) { | |
450 | ret = snprintf(buf, PAGE_SIZE, "%s\n", | |
451 | active_stack->sp_name); | |
452 | if (ret == PAGE_SIZE) | |
453 | ret = -E2BIG; | |
454 | } | |
455 | spin_unlock(&ocfs2_stack_lock); | |
456 | ||
457 | return ret; | |
458 | } | |
459 | ||
460 | static struct kobj_attribute ocfs2_attr_active_cluster_plugin = | |
461 | __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO, | |
462 | ocfs2_active_cluster_plugin_show, NULL); | |
463 | ||
9c6c877c JB |
464 | static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj, |
465 | struct kobj_attribute *attr, | |
466 | char *buf) | |
467 | { | |
468 | ssize_t ret; | |
469 | spin_lock(&ocfs2_stack_lock); | |
470 | ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name); | |
471 | spin_unlock(&ocfs2_stack_lock); | |
472 | ||
473 | return ret; | |
474 | } | |
475 | ||
476 | static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj, | |
477 | struct kobj_attribute *attr, | |
478 | const char *buf, size_t count) | |
479 | { | |
480 | size_t len = count; | |
481 | ssize_t ret; | |
482 | ||
483 | if (len == 0) | |
484 | return len; | |
485 | ||
486 | if (buf[len - 1] == '\n') | |
487 | len--; | |
488 | ||
489 | if ((len != OCFS2_STACK_LABEL_LEN) || | |
490 | (strnlen(buf, len) != len)) | |
491 | return -EINVAL; | |
492 | ||
493 | spin_lock(&ocfs2_stack_lock); | |
494 | if (active_stack) { | |
495 | if (!strncmp(buf, cluster_stack_name, len)) | |
496 | ret = count; | |
497 | else | |
498 | ret = -EBUSY; | |
499 | } else { | |
500 | memcpy(cluster_stack_name, buf, len); | |
501 | ret = count; | |
502 | } | |
503 | spin_unlock(&ocfs2_stack_lock); | |
504 | ||
505 | return ret; | |
506 | } | |
507 | ||
508 | ||
509 | static struct kobj_attribute ocfs2_attr_cluster_stack = | |
510 | __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR, | |
511 | ocfs2_cluster_stack_show, | |
512 | ocfs2_cluster_stack_store); | |
513 | ||
74ae4e10 JB |
514 | static struct attribute *ocfs2_attrs[] = { |
515 | &ocfs2_attr_max_locking_protocol.attr, | |
516 | &ocfs2_attr_loaded_cluster_plugins.attr, | |
517 | &ocfs2_attr_active_cluster_plugin.attr, | |
9c6c877c | 518 | &ocfs2_attr_cluster_stack.attr, |
74ae4e10 JB |
519 | NULL, |
520 | }; | |
521 | ||
522 | static struct attribute_group ocfs2_attr_group = { | |
523 | .attrs = ocfs2_attrs, | |
524 | }; | |
525 | ||
526 | static struct kset *ocfs2_kset; | |
527 | ||
528 | static void ocfs2_sysfs_exit(void) | |
529 | { | |
530 | kset_unregister(ocfs2_kset); | |
531 | } | |
532 | ||
533 | static int ocfs2_sysfs_init(void) | |
534 | { | |
535 | int ret; | |
536 | ||
537 | ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); | |
538 | if (!ocfs2_kset) | |
539 | return -ENOMEM; | |
540 | ||
541 | ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); | |
542 | if (ret) | |
543 | goto error; | |
544 | ||
286eaa95 | 545 | return 0; |
74ae4e10 JB |
546 | |
547 | error: | |
548 | kset_unregister(ocfs2_kset); | |
549 | return ret; | |
550 | } | |
551 | ||
3878f110 JB |
552 | /* |
553 | * Sysctl bits | |
554 | * | |
555 | * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't | |
556 | * make as much sense in a multiple cluster stack world, but it's safer | |
557 | * and easier to preserve the name. | |
558 | */ | |
559 | ||
560 | #define FS_OCFS2_NM 1 | |
561 | ||
562 | #define OCFS2_MAX_HB_CTL_PATH 256 | |
563 | static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; | |
564 | ||
565 | static ctl_table ocfs2_nm_table[] = { | |
566 | { | |
567 | .ctl_name = 1, | |
568 | .procname = "hb_ctl_path", | |
569 | .data = ocfs2_hb_ctl_path, | |
570 | .maxlen = OCFS2_MAX_HB_CTL_PATH, | |
571 | .mode = 0644, | |
572 | .proc_handler = &proc_dostring, | |
573 | .strategy = &sysctl_string, | |
574 | }, | |
575 | { .ctl_name = 0 } | |
576 | }; | |
577 | ||
578 | static ctl_table ocfs2_mod_table[] = { | |
579 | { | |
580 | .ctl_name = FS_OCFS2_NM, | |
581 | .procname = "nm", | |
582 | .data = NULL, | |
583 | .maxlen = 0, | |
584 | .mode = 0555, | |
585 | .child = ocfs2_nm_table | |
586 | }, | |
587 | { .ctl_name = 0} | |
588 | }; | |
589 | ||
590 | static ctl_table ocfs2_kern_table[] = { | |
591 | { | |
592 | .ctl_name = FS_OCFS2, | |
593 | .procname = "ocfs2", | |
594 | .data = NULL, | |
595 | .maxlen = 0, | |
596 | .mode = 0555, | |
597 | .child = ocfs2_mod_table | |
598 | }, | |
599 | { .ctl_name = 0} | |
600 | }; | |
601 | ||
602 | static ctl_table ocfs2_root_table[] = { | |
603 | { | |
604 | .ctl_name = CTL_FS, | |
605 | .procname = "fs", | |
606 | .data = NULL, | |
607 | .maxlen = 0, | |
608 | .mode = 0555, | |
609 | .child = ocfs2_kern_table | |
610 | }, | |
611 | { .ctl_name = 0 } | |
612 | }; | |
613 | ||
614 | static struct ctl_table_header *ocfs2_table_header = NULL; | |
615 | ||
616 | const char *ocfs2_get_hb_ctl_path(void) | |
617 | { | |
618 | return ocfs2_hb_ctl_path; | |
619 | } | |
620 | EXPORT_SYMBOL_GPL(ocfs2_get_hb_ctl_path); | |
621 | ||
622 | ||
623 | /* | |
624 | * Initialization | |
625 | */ | |
626 | ||
74ae4e10 JB |
627 | static int __init ocfs2_stack_glue_init(void) |
628 | { | |
9c6c877c JB |
629 | strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
630 | ||
3878f110 JB |
631 | ocfs2_table_header = register_sysctl_table(ocfs2_root_table); |
632 | if (!ocfs2_table_header) { | |
633 | printk(KERN_ERR | |
634 | "ocfs2 stack glue: unable to register sysctl\n"); | |
635 | return -ENOMEM; /* or something. */ | |
636 | } | |
637 | ||
74ae4e10 | 638 | return ocfs2_sysfs_init(); |
286eaa95 | 639 | } |
24ef1815 | 640 | |
286eaa95 JB |
641 | static void __exit ocfs2_stack_glue_exit(void) |
642 | { | |
643 | lproto = NULL; | |
74ae4e10 | 644 | ocfs2_sysfs_exit(); |
3878f110 JB |
645 | if (ocfs2_table_header) |
646 | unregister_sysctl_table(ocfs2_table_header); | |
24ef1815 JB |
647 | } |
648 | ||
286eaa95 JB |
649 | MODULE_AUTHOR("Oracle"); |
650 | MODULE_DESCRIPTION("ocfs2 cluter stack glue layer"); | |
651 | MODULE_LICENSE("GPL"); | |
652 | module_init(ocfs2_stack_glue_init); | |
653 | module_exit(ocfs2_stack_glue_exit); |