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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, 2009 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 | |
21 | #include <linux/list.h> |
22 | #include <linux/spinlock.h> |
23 | #include <linux/module.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/kmod.h> |
26 | #include <linux/fs.h> |
27 | #include <linux/kobject.h> |
28 | #include <linux/sysfs.h> |
29 | #include <linux/sysctl.h> |
30 | |
31 | #include "ocfs2_fs.h" |
32 | |
33 | #include "stackglue.h" |
34 | |
35 | #define OCFS2_STACK_PLUGIN_O2CB "o2cb" |
36 | #define OCFS2_STACK_PLUGIN_USER "user" |
37 | #define OCFS2_MAX_HB_CTL_PATH 256 |
38 | |
39 | static struct ocfs2_protocol_version locking_max_version; |
40 | static DEFINE_SPINLOCK(ocfs2_stack_lock); |
41 | static LIST_HEAD(ocfs2_stack_list); |
42 | static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1]; |
43 | static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; |
44 | |
45 | /* |
46 | * The stack currently in use. If not null, active_stack->sp_count > 0, |
47 | * the module is pinned, and the locking protocol cannot be changed. |
48 | */ |
49 | static struct ocfs2_stack_plugin *active_stack; |
50 | |
51 | static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name) |
52 | { |
53 | struct ocfs2_stack_plugin *p; |
54 | |
55 | assert_spin_locked(&ocfs2_stack_lock); |
56 | |
57 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
58 | if (!strcmp(p->sp_name, name)) |
59 | return p; |
60 | } |
61 | |
62 | return NULL; |
63 | } |
64 | |
65 | static int ocfs2_stack_driver_request(const char *stack_name, |
66 | const char *plugin_name) |
67 | { |
68 | int rc; |
69 | struct ocfs2_stack_plugin *p; |
70 | |
71 | spin_lock(&ocfs2_stack_lock); |
72 | |
73 | /* |
74 | * If the stack passed by the filesystem isn't the selected one, |
75 | * we can't continue. |
76 | */ |
77 | if (strcmp(stack_name, cluster_stack_name)) { |
78 | rc = -EBUSY; |
79 | goto out; |
80 | } |
81 | |
82 | if (active_stack) { |
83 | /* |
84 | * If the active stack isn't the one we want, it cannot |
85 | * be selected right now. |
86 | */ |
87 | if (!strcmp(active_stack->sp_name, plugin_name)) |
88 | rc = 0; |
89 | else |
90 | rc = -EBUSY; |
91 | goto out; |
92 | } |
93 | |
94 | p = ocfs2_stack_lookup(plugin_name); |
95 | if (!p || !try_module_get(p->sp_owner)) { |
96 | rc = -ENOENT; |
97 | goto out; |
98 | } |
99 | |
100 | active_stack = p; |
101 | rc = 0; |
102 | |
103 | out: |
104 | /* If we found it, pin it */ |
105 | if (!rc) |
106 | active_stack->sp_count++; |
107 | |
108 | spin_unlock(&ocfs2_stack_lock); |
109 | return rc; |
110 | } |
111 | |
112 | /* |
113 | * This function looks up the appropriate stack and makes it active. If |
114 | * there is no stack, it tries to load it. It will fail if the stack still |
115 | * cannot be found. It will also fail if a different stack is in use. |
116 | */ |
117 | static int ocfs2_stack_driver_get(const char *stack_name) |
118 | { |
119 | int rc; |
120 | char *plugin_name = OCFS2_STACK_PLUGIN_O2CB; |
121 | |
122 | /* |
123 | * Classic stack does not pass in a stack name. This is |
124 | * compatible with older tools as well. |
125 | */ |
126 | if (!stack_name || !*stack_name) |
127 | stack_name = OCFS2_STACK_PLUGIN_O2CB; |
128 | |
129 | if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) { |
130 | printk(KERN_ERR |
131 | "ocfs2 passed an invalid cluster stack label: \"%s\"\n", |
132 | stack_name); |
133 | return -EINVAL; |
134 | } |
135 | |
136 | /* Anything that isn't the classic stack is a user stack */ |
137 | if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB)) |
138 | plugin_name = OCFS2_STACK_PLUGIN_USER; |
139 | |
140 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); |
141 | if (rc == -ENOENT) { |
142 | request_module("ocfs2_stack_%s", plugin_name); |
143 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); |
144 | } |
145 | |
146 | if (rc == -ENOENT) { |
147 | printk(KERN_ERR |
148 | "ocfs2: Cluster stack driver \"%s\" cannot be found\n", |
149 | plugin_name); |
150 | } else if (rc == -EBUSY) { |
151 | printk(KERN_ERR |
152 | "ocfs2: A different cluster stack is in use\n"); |
153 | } |
154 | |
155 | return rc; |
156 | } |
157 | |
158 | static void ocfs2_stack_driver_put(void) |
159 | { |
160 | spin_lock(&ocfs2_stack_lock); |
161 | BUG_ON(active_stack == NULL); |
162 | BUG_ON(active_stack->sp_count == 0); |
163 | |
164 | active_stack->sp_count--; |
165 | if (!active_stack->sp_count) { |
166 | module_put(active_stack->sp_owner); |
167 | active_stack = NULL; |
168 | } |
169 | spin_unlock(&ocfs2_stack_lock); |
170 | } |
171 | |
172 | int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin) |
173 | { |
174 | int rc; |
175 | |
176 | spin_lock(&ocfs2_stack_lock); |
177 | if (!ocfs2_stack_lookup(plugin->sp_name)) { |
178 | plugin->sp_count = 0; |
179 | plugin->sp_max_proto = locking_max_version; |
180 | list_add(&plugin->sp_list, &ocfs2_stack_list); |
181 | printk(KERN_INFO "ocfs2: Registered cluster interface %s\n", |
182 | plugin->sp_name); |
183 | rc = 0; |
184 | } else { |
185 | printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n", |
186 | plugin->sp_name); |
187 | rc = -EEXIST; |
188 | } |
189 | spin_unlock(&ocfs2_stack_lock); |
190 | |
191 | return rc; |
192 | } |
193 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register); |
194 | |
195 | void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin) |
196 | { |
197 | struct ocfs2_stack_plugin *p; |
198 | |
199 | spin_lock(&ocfs2_stack_lock); |
200 | p = ocfs2_stack_lookup(plugin->sp_name); |
201 | if (p) { |
202 | BUG_ON(p != plugin); |
203 | BUG_ON(plugin == active_stack); |
204 | BUG_ON(plugin->sp_count != 0); |
205 | list_del_init(&plugin->sp_list); |
206 | printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n", |
207 | plugin->sp_name); |
208 | } else { |
209 | printk(KERN_ERR "Stack \"%s\" is not registered\n", |
210 | plugin->sp_name); |
211 | } |
212 | spin_unlock(&ocfs2_stack_lock); |
213 | } |
214 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister); |
215 | |
216 | void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto) |
217 | { |
218 | struct ocfs2_stack_plugin *p; |
219 | |
220 | spin_lock(&ocfs2_stack_lock); |
221 | if (memcmp(max_proto, &locking_max_version, |
222 | sizeof(struct ocfs2_protocol_version))) { |
223 | BUG_ON(locking_max_version.pv_major != 0); |
224 | |
225 | locking_max_version = *max_proto; |
226 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
227 | p->sp_max_proto = locking_max_version; |
228 | } |
229 | } |
230 | spin_unlock(&ocfs2_stack_lock); |
231 | } |
232 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version); |
233 | |
234 | |
235 | /* |
236 | * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument |
237 | * for the ast and bast functions. They will pass the lksb to the ast |
238 | * and bast. The caller can wrap the lksb with their own structure to |
239 | * get more information. |
240 | */ |
241 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
242 | int mode, |
243 | struct ocfs2_dlm_lksb *lksb, |
244 | u32 flags, |
245 | void *name, |
246 | unsigned int namelen) |
247 | { |
248 | if (!lksb->lksb_conn) |
249 | lksb->lksb_conn = conn; |
250 | else |
251 | BUG_ON(lksb->lksb_conn != conn); |
252 | return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
253 | name, namelen); |
254 | } |
255 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
256 | |
257 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
258 | struct ocfs2_dlm_lksb *lksb, |
259 | u32 flags) |
260 | { |
261 | BUG_ON(lksb->lksb_conn == NULL); |
262 | |
263 | return active_stack->sp_ops->dlm_unlock(conn, lksb, flags); |
264 | } |
265 | EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
266 | |
267 | int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
268 | { |
269 | return active_stack->sp_ops->lock_status(lksb); |
270 | } |
271 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
272 | |
273 | int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
274 | { |
275 | return active_stack->sp_ops->lvb_valid(lksb); |
276 | } |
277 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid); |
278 | |
279 | void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
280 | { |
281 | return active_stack->sp_ops->lock_lvb(lksb); |
282 | } |
283 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
284 | |
285 | void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
286 | { |
287 | active_stack->sp_ops->dump_lksb(lksb); |
288 | } |
289 | EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
290 | |
291 | int ocfs2_stack_supports_plocks(void) |
292 | { |
293 | return active_stack && active_stack->sp_ops->plock; |
294 | } |
295 | EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks); |
296 | |
297 | /* |
298 | * ocfs2_plock() can only be safely called if |
299 | * ocfs2_stack_supports_plocks() returned true |
300 | */ |
301 | int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino, |
302 | struct file *file, int cmd, struct file_lock *fl) |
303 | { |
304 | WARN_ON_ONCE(active_stack->sp_ops->plock == NULL); |
305 | if (active_stack->sp_ops->plock) |
306 | return active_stack->sp_ops->plock(conn, ino, file, cmd, fl); |
307 | return -EOPNOTSUPP; |
308 | } |
309 | EXPORT_SYMBOL_GPL(ocfs2_plock); |
310 | |
311 | int ocfs2_cluster_connect(const char *stack_name, |
312 | const char *group, |
313 | int grouplen, |
314 | struct ocfs2_locking_protocol *lproto, |
315 | void (*recovery_handler)(int node_num, |
316 | void *recovery_data), |
317 | void *recovery_data, |
318 | struct ocfs2_cluster_connection **conn) |
319 | { |
320 | int rc = 0; |
321 | struct ocfs2_cluster_connection *new_conn; |
322 | |
323 | BUG_ON(group == NULL); |
324 | BUG_ON(conn == NULL); |
325 | BUG_ON(recovery_handler == NULL); |
326 | |
327 | if (grouplen > GROUP_NAME_MAX) { |
328 | rc = -EINVAL; |
329 | goto out; |
330 | } |
331 | |
332 | if (memcmp(&lproto->lp_max_version, &locking_max_version, |
333 | sizeof(struct ocfs2_protocol_version))) { |
334 | rc = -EINVAL; |
335 | goto out; |
336 | } |
337 | |
338 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), |
339 | GFP_KERNEL); |
340 | if (!new_conn) { |
341 | rc = -ENOMEM; |
342 | goto out; |
343 | } |
344 | |
345 | memcpy(new_conn->cc_name, group, grouplen); |
346 | new_conn->cc_namelen = grouplen; |
347 | new_conn->cc_recovery_handler = recovery_handler; |
348 | new_conn->cc_recovery_data = recovery_data; |
349 | |
350 | new_conn->cc_proto = lproto; |
351 | /* Start the new connection at our maximum compatibility level */ |
352 | new_conn->cc_version = lproto->lp_max_version; |
353 | |
354 | /* This will pin the stack driver if successful */ |
355 | rc = ocfs2_stack_driver_get(stack_name); |
356 | if (rc) |
357 | goto out_free; |
358 | |
359 | rc = active_stack->sp_ops->connect(new_conn); |
360 | if (rc) { |
361 | ocfs2_stack_driver_put(); |
362 | goto out_free; |
363 | } |
364 | |
365 | *conn = new_conn; |
366 | |
367 | out_free: |
368 | if (rc) |
369 | kfree(new_conn); |
370 | |
371 | out: |
372 | return rc; |
373 | } |
374 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
375 | |
376 | /* The caller will ensure all nodes have the same cluster stack */ |
377 | int ocfs2_cluster_connect_agnostic(const char *group, |
378 | int grouplen, |
379 | struct ocfs2_locking_protocol *lproto, |
380 | void (*recovery_handler)(int node_num, |
381 | void *recovery_data), |
382 | void *recovery_data, |
383 | struct ocfs2_cluster_connection **conn) |
384 | { |
385 | char *stack_name = NULL; |
386 | |
387 | if (cluster_stack_name[0]) |
388 | stack_name = cluster_stack_name; |
389 | return ocfs2_cluster_connect(stack_name, group, grouplen, lproto, |
390 | recovery_handler, recovery_data, conn); |
391 | } |
392 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic); |
393 | |
394 | /* If hangup_pending is 0, the stack driver will be dropped */ |
395 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, |
396 | int hangup_pending) |
397 | { |
398 | int ret; |
399 | |
400 | BUG_ON(conn == NULL); |
401 | |
402 | ret = active_stack->sp_ops->disconnect(conn); |
403 | |
404 | /* XXX Should we free it anyway? */ |
405 | if (!ret) { |
406 | kfree(conn); |
407 | if (!hangup_pending) |
408 | ocfs2_stack_driver_put(); |
409 | } |
410 | |
411 | return ret; |
412 | } |
413 | EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
414 | |
415 | /* |
416 | * Leave the group for this filesystem. This is executed by a userspace |
417 | * program (stored in ocfs2_hb_ctl_path). |
418 | */ |
419 | static void ocfs2_leave_group(const char *group) |
420 | { |
421 | int ret; |
422 | char *argv[5], *envp[3]; |
423 | |
424 | argv[0] = ocfs2_hb_ctl_path; |
425 | argv[1] = "-K"; |
426 | argv[2] = "-u"; |
427 | argv[3] = (char *)group; |
428 | argv[4] = NULL; |
429 | |
430 | /* minimal command environment taken from cpu_run_sbin_hotplug */ |
431 | envp[0] = "HOME=/"; |
432 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
433 | envp[2] = NULL; |
434 | |
435 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); |
436 | if (ret < 0) { |
437 | printk(KERN_ERR |
438 | "ocfs2: Error %d running user helper " |
439 | "\"%s %s %s %s\"\n", |
440 | ret, argv[0], argv[1], argv[2], argv[3]); |
441 | } |
442 | } |
443 | |
444 | /* |
445 | * Hangup is a required post-umount. ocfs2-tools software expects the |
446 | * filesystem to call "ocfs2_hb_ctl" during unmount. This happens |
447 | * regardless of whether the DLM got started, so we can't do it |
448 | * in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does |
449 | * the actual work. |
450 | */ |
451 | void ocfs2_cluster_hangup(const char *group, int grouplen) |
452 | { |
453 | BUG_ON(group == NULL); |
454 | BUG_ON(group[grouplen] != '\0'); |
455 | |
456 | ocfs2_leave_group(group); |
457 | |
458 | /* cluster_disconnect() was called with hangup_pending==1 */ |
459 | ocfs2_stack_driver_put(); |
460 | } |
461 | EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
462 | |
463 | int ocfs2_cluster_this_node(unsigned int *node) |
464 | { |
465 | return active_stack->sp_ops->this_node(node); |
466 | } |
467 | EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
468 | |
469 | |
470 | /* |
471 | * Sysfs bits |
472 | */ |
473 | |
474 | static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, |
475 | struct kobj_attribute *attr, |
476 | char *buf) |
477 | { |
478 | ssize_t ret = 0; |
479 | |
480 | spin_lock(&ocfs2_stack_lock); |
481 | if (locking_max_version.pv_major) |
482 | ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", |
483 | locking_max_version.pv_major, |
484 | locking_max_version.pv_minor); |
485 | spin_unlock(&ocfs2_stack_lock); |
486 | |
487 | return ret; |
488 | } |
489 | |
490 | static struct kobj_attribute ocfs2_attr_max_locking_protocol = |
491 | __ATTR(max_locking_protocol, S_IFREG | S_IRUGO, |
492 | ocfs2_max_locking_protocol_show, NULL); |
493 | |
494 | static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, |
495 | struct kobj_attribute *attr, |
496 | char *buf) |
497 | { |
498 | ssize_t ret = 0, total = 0, remain = PAGE_SIZE; |
499 | struct ocfs2_stack_plugin *p; |
500 | |
501 | spin_lock(&ocfs2_stack_lock); |
502 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
503 | ret = snprintf(buf, remain, "%s\n", |
504 | p->sp_name); |
505 | if (ret < 0) { |
506 | total = ret; |
507 | break; |
508 | } |
509 | if (ret == remain) { |
510 | /* snprintf() didn't fit */ |
511 | total = -E2BIG; |
512 | break; |
513 | } |
514 | total += ret; |
515 | remain -= ret; |
516 | } |
517 | spin_unlock(&ocfs2_stack_lock); |
518 | |
519 | return total; |
520 | } |
521 | |
522 | static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = |
523 | __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO, |
524 | ocfs2_loaded_cluster_plugins_show, NULL); |
525 | |
526 | static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, |
527 | struct kobj_attribute *attr, |
528 | char *buf) |
529 | { |
530 | ssize_t ret = 0; |
531 | |
532 | spin_lock(&ocfs2_stack_lock); |
533 | if (active_stack) { |
534 | ret = snprintf(buf, PAGE_SIZE, "%s\n", |
535 | active_stack->sp_name); |
536 | if (ret == PAGE_SIZE) |
537 | ret = -E2BIG; |
538 | } |
539 | spin_unlock(&ocfs2_stack_lock); |
540 | |
541 | return ret; |
542 | } |
543 | |
544 | static struct kobj_attribute ocfs2_attr_active_cluster_plugin = |
545 | __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO, |
546 | ocfs2_active_cluster_plugin_show, NULL); |
547 | |
548 | static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj, |
549 | struct kobj_attribute *attr, |
550 | char *buf) |
551 | { |
552 | ssize_t ret; |
553 | spin_lock(&ocfs2_stack_lock); |
554 | ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name); |
555 | spin_unlock(&ocfs2_stack_lock); |
556 | |
557 | return ret; |
558 | } |
559 | |
560 | static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj, |
561 | struct kobj_attribute *attr, |
562 | const char *buf, size_t count) |
563 | { |
564 | size_t len = count; |
565 | ssize_t ret; |
566 | |
567 | if (len == 0) |
568 | return len; |
569 | |
570 | if (buf[len - 1] == '\n') |
571 | len--; |
572 | |
573 | if ((len != OCFS2_STACK_LABEL_LEN) || |
574 | (strnlen(buf, len) != len)) |
575 | return -EINVAL; |
576 | |
577 | spin_lock(&ocfs2_stack_lock); |
578 | if (active_stack) { |
579 | if (!strncmp(buf, cluster_stack_name, len)) |
580 | ret = count; |
581 | else |
582 | ret = -EBUSY; |
583 | } else { |
584 | memcpy(cluster_stack_name, buf, len); |
585 | ret = count; |
586 | } |
587 | spin_unlock(&ocfs2_stack_lock); |
588 | |
589 | return ret; |
590 | } |
591 | |
592 | |
593 | static struct kobj_attribute ocfs2_attr_cluster_stack = |
594 | __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR, |
595 | ocfs2_cluster_stack_show, |
596 | ocfs2_cluster_stack_store); |
597 | |
598 | static struct attribute *ocfs2_attrs[] = { |
599 | &ocfs2_attr_max_locking_protocol.attr, |
600 | &ocfs2_attr_loaded_cluster_plugins.attr, |
601 | &ocfs2_attr_active_cluster_plugin.attr, |
602 | &ocfs2_attr_cluster_stack.attr, |
603 | NULL, |
604 | }; |
605 | |
606 | static struct attribute_group ocfs2_attr_group = { |
607 | .attrs = ocfs2_attrs, |
608 | }; |
609 | |
610 | static struct kset *ocfs2_kset; |
611 | |
612 | static void ocfs2_sysfs_exit(void) |
613 | { |
614 | kset_unregister(ocfs2_kset); |
615 | } |
616 | |
617 | static int ocfs2_sysfs_init(void) |
618 | { |
619 | int ret; |
620 | |
621 | ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); |
622 | if (!ocfs2_kset) |
623 | return -ENOMEM; |
624 | |
625 | ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); |
626 | if (ret) |
627 | goto error; |
628 | |
629 | return 0; |
630 | |
631 | error: |
632 | kset_unregister(ocfs2_kset); |
633 | return ret; |
634 | } |
635 | |
636 | /* |
637 | * Sysctl bits |
638 | * |
639 | * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't |
640 | * make as much sense in a multiple cluster stack world, but it's safer |
641 | * and easier to preserve the name. |
642 | */ |
643 | |
644 | #define FS_OCFS2_NM 1 |
645 | |
646 | static ctl_table ocfs2_nm_table[] = { |
647 | { |
648 | .procname = "hb_ctl_path", |
649 | .data = ocfs2_hb_ctl_path, |
650 | .maxlen = OCFS2_MAX_HB_CTL_PATH, |
651 | .mode = 0644, |
652 | .proc_handler = proc_dostring, |
653 | }, |
654 | { } |
655 | }; |
656 | |
657 | static ctl_table ocfs2_mod_table[] = { |
658 | { |
659 | .procname = "nm", |
660 | .data = NULL, |
661 | .maxlen = 0, |
662 | .mode = 0555, |
663 | .child = ocfs2_nm_table |
664 | }, |
665 | { } |
666 | }; |
667 | |
668 | static ctl_table ocfs2_kern_table[] = { |
669 | { |
670 | .procname = "ocfs2", |
671 | .data = NULL, |
672 | .maxlen = 0, |
673 | .mode = 0555, |
674 | .child = ocfs2_mod_table |
675 | }, |
676 | { } |
677 | }; |
678 | |
679 | static ctl_table ocfs2_root_table[] = { |
680 | { |
681 | .procname = "fs", |
682 | .data = NULL, |
683 | .maxlen = 0, |
684 | .mode = 0555, |
685 | .child = ocfs2_kern_table |
686 | }, |
687 | { } |
688 | }; |
689 | |
690 | static struct ctl_table_header *ocfs2_table_header = NULL; |
691 | |
692 | |
693 | /* |
694 | * Initialization |
695 | */ |
696 | |
697 | static int __init ocfs2_stack_glue_init(void) |
698 | { |
699 | strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
700 | |
701 | ocfs2_table_header = register_sysctl_table(ocfs2_root_table); |
702 | if (!ocfs2_table_header) { |
703 | printk(KERN_ERR |
704 | "ocfs2 stack glue: unable to register sysctl\n"); |
705 | return -ENOMEM; /* or something. */ |
706 | } |
707 | |
708 | return ocfs2_sysfs_init(); |
709 | } |
710 | |
711 | static void __exit ocfs2_stack_glue_exit(void) |
712 | { |
713 | memset(&locking_max_version, 0, |
714 | sizeof(struct ocfs2_protocol_version)); |
715 | locking_max_version.pv_major = 0; |
716 | locking_max_version.pv_minor = 0; |
717 | ocfs2_sysfs_exit(); |
718 | if (ocfs2_table_header) |
719 | unregister_sysctl_table(ocfs2_table_header); |
720 | } |
721 | |
722 | MODULE_AUTHOR("Oracle"); |
723 | MODULE_DESCRIPTION("ocfs2 cluter stack glue layer"); |
724 | MODULE_LICENSE("GPL"); |
725 | module_init(ocfs2_stack_glue_init); |
726 | module_exit(ocfs2_stack_glue_exit); |
727 |
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