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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 | * | |
1c520dfb | 9 | * Copyright (C) 2007, 2009 Oracle. All rights reserved. |
24ef1815 JB |
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" | |
9f9a99f4 | 37 | #define OCFS2_MAX_HB_CTL_PATH 256 |
9c6c877c | 38 | |
553b5eb9 | 39 | static struct ocfs2_protocol_version locking_max_version; |
286eaa95 JB |
40 | static DEFINE_SPINLOCK(ocfs2_stack_lock); |
41 | static LIST_HEAD(ocfs2_stack_list); | |
9c6c877c | 42 | static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1]; |
9f9a99f4 | 43 | static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; |
19fdb624 | 44 | |
286eaa95 JB |
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 | ||
e7ee2c08 ER |
51 | inline int ocfs2_is_o2cb_active(void) |
52 | { | |
53 | return !strcmp(active_stack->sp_name, OCFS2_STACK_PLUGIN_O2CB); | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(ocfs2_is_o2cb_active); | |
56 | ||
286eaa95 JB |
57 | static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name) |
58 | { | |
59 | struct ocfs2_stack_plugin *p; | |
60 | ||
61 | assert_spin_locked(&ocfs2_stack_lock); | |
62 | ||
63 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
64 | if (!strcmp(p->sp_name, name)) | |
65 | return p; | |
66 | } | |
67 | ||
68 | return NULL; | |
69 | } | |
70 | ||
9c6c877c JB |
71 | static int ocfs2_stack_driver_request(const char *stack_name, |
72 | const char *plugin_name) | |
286eaa95 JB |
73 | { |
74 | int rc; | |
75 | struct ocfs2_stack_plugin *p; | |
76 | ||
77 | spin_lock(&ocfs2_stack_lock); | |
78 | ||
9c6c877c JB |
79 | /* |
80 | * If the stack passed by the filesystem isn't the selected one, | |
81 | * we can't continue. | |
82 | */ | |
83 | if (strcmp(stack_name, cluster_stack_name)) { | |
84 | rc = -EBUSY; | |
85 | goto out; | |
86 | } | |
87 | ||
286eaa95 JB |
88 | if (active_stack) { |
89 | /* | |
90 | * If the active stack isn't the one we want, it cannot | |
91 | * be selected right now. | |
92 | */ | |
9c6c877c | 93 | if (!strcmp(active_stack->sp_name, plugin_name)) |
286eaa95 JB |
94 | rc = 0; |
95 | else | |
96 | rc = -EBUSY; | |
97 | goto out; | |
98 | } | |
99 | ||
9c6c877c | 100 | p = ocfs2_stack_lookup(plugin_name); |
286eaa95 JB |
101 | if (!p || !try_module_get(p->sp_owner)) { |
102 | rc = -ENOENT; | |
103 | goto out; | |
104 | } | |
105 | ||
286eaa95 | 106 | active_stack = p; |
286eaa95 JB |
107 | rc = 0; |
108 | ||
109 | out: | |
d6817cdb JB |
110 | /* If we found it, pin it */ |
111 | if (!rc) | |
112 | active_stack->sp_count++; | |
113 | ||
286eaa95 JB |
114 | spin_unlock(&ocfs2_stack_lock); |
115 | return rc; | |
116 | } | |
117 | ||
118 | /* | |
119 | * This function looks up the appropriate stack and makes it active. If | |
120 | * there is no stack, it tries to load it. It will fail if the stack still | |
121 | * cannot be found. It will also fail if a different stack is in use. | |
122 | */ | |
9c6c877c | 123 | static int ocfs2_stack_driver_get(const char *stack_name) |
286eaa95 JB |
124 | { |
125 | int rc; | |
9c6c877c JB |
126 | char *plugin_name = OCFS2_STACK_PLUGIN_O2CB; |
127 | ||
128 | /* | |
129 | * Classic stack does not pass in a stack name. This is | |
130 | * compatible with older tools as well. | |
131 | */ | |
132 | if (!stack_name || !*stack_name) | |
133 | stack_name = OCFS2_STACK_PLUGIN_O2CB; | |
134 | ||
135 | if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) { | |
136 | printk(KERN_ERR | |
137 | "ocfs2 passed an invalid cluster stack label: \"%s\"\n", | |
138 | stack_name); | |
139 | return -EINVAL; | |
140 | } | |
286eaa95 | 141 | |
9c6c877c JB |
142 | /* Anything that isn't the classic stack is a user stack */ |
143 | if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB)) | |
144 | plugin_name = OCFS2_STACK_PLUGIN_USER; | |
145 | ||
146 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 | 147 | if (rc == -ENOENT) { |
9c6c877c JB |
148 | request_module("ocfs2_stack_%s", plugin_name); |
149 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 JB |
150 | } |
151 | ||
152 | if (rc == -ENOENT) { | |
153 | printk(KERN_ERR | |
154 | "ocfs2: Cluster stack driver \"%s\" cannot be found\n", | |
9c6c877c | 155 | plugin_name); |
286eaa95 JB |
156 | } else if (rc == -EBUSY) { |
157 | printk(KERN_ERR | |
9c6c877c | 158 | "ocfs2: A different cluster stack is in use\n"); |
286eaa95 JB |
159 | } |
160 | ||
161 | return rc; | |
162 | } | |
24ef1815 | 163 | |
286eaa95 JB |
164 | static void ocfs2_stack_driver_put(void) |
165 | { | |
166 | spin_lock(&ocfs2_stack_lock); | |
167 | BUG_ON(active_stack == NULL); | |
168 | BUG_ON(active_stack->sp_count == 0); | |
169 | ||
170 | active_stack->sp_count--; | |
171 | if (!active_stack->sp_count) { | |
172 | module_put(active_stack->sp_owner); | |
173 | active_stack = NULL; | |
174 | } | |
175 | spin_unlock(&ocfs2_stack_lock); | |
176 | } | |
177 | ||
178 | int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin) | |
179 | { | |
180 | int rc; | |
181 | ||
182 | spin_lock(&ocfs2_stack_lock); | |
183 | if (!ocfs2_stack_lookup(plugin->sp_name)) { | |
184 | plugin->sp_count = 0; | |
553b5eb9 | 185 | plugin->sp_max_proto = locking_max_version; |
286eaa95 JB |
186 | list_add(&plugin->sp_list, &ocfs2_stack_list); |
187 | printk(KERN_INFO "ocfs2: Registered cluster interface %s\n", | |
188 | plugin->sp_name); | |
189 | rc = 0; | |
190 | } else { | |
191 | printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n", | |
192 | plugin->sp_name); | |
193 | rc = -EEXIST; | |
194 | } | |
195 | spin_unlock(&ocfs2_stack_lock); | |
196 | ||
197 | return rc; | |
198 | } | |
199 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register); | |
200 | ||
201 | void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin) | |
202 | { | |
203 | struct ocfs2_stack_plugin *p; | |
204 | ||
205 | spin_lock(&ocfs2_stack_lock); | |
206 | p = ocfs2_stack_lookup(plugin->sp_name); | |
207 | if (p) { | |
208 | BUG_ON(p != plugin); | |
209 | BUG_ON(plugin == active_stack); | |
210 | BUG_ON(plugin->sp_count != 0); | |
211 | list_del_init(&plugin->sp_list); | |
212 | printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n", | |
213 | plugin->sp_name); | |
214 | } else { | |
215 | printk(KERN_ERR "Stack \"%s\" is not registered\n", | |
216 | plugin->sp_name); | |
217 | } | |
218 | spin_unlock(&ocfs2_stack_lock); | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister); | |
221 | ||
553b5eb9 | 222 | void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto) |
286eaa95 JB |
223 | { |
224 | struct ocfs2_stack_plugin *p; | |
225 | ||
286eaa95 | 226 | spin_lock(&ocfs2_stack_lock); |
553b5eb9 JB |
227 | if (memcmp(max_proto, &locking_max_version, |
228 | sizeof(struct ocfs2_protocol_version))) { | |
229 | BUG_ON(locking_max_version.pv_major != 0); | |
286eaa95 | 230 | |
553b5eb9 JB |
231 | locking_max_version = *max_proto; |
232 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
233 | p->sp_max_proto = locking_max_version; | |
234 | } | |
286eaa95 | 235 | } |
286eaa95 JB |
236 | spin_unlock(&ocfs2_stack_lock); |
237 | } | |
553b5eb9 | 238 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version); |
7431cd7e | 239 | |
24ef1815 | 240 | |
cf4d8d75 | 241 | /* |
a796d286 JB |
242 | * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument |
243 | * for the ast and bast functions. They will pass the lksb to the ast | |
244 | * and bast. The caller can wrap the lksb with their own structure to | |
245 | * get more information. | |
cf4d8d75 | 246 | */ |
553aa7e4 JB |
247 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
248 | int mode, | |
c0e41338 | 249 | struct ocfs2_dlm_lksb *lksb, |
553aa7e4 JB |
250 | u32 flags, |
251 | void *name, | |
a796d286 | 252 | unsigned int namelen) |
553aa7e4 | 253 | { |
c0e41338 JB |
254 | if (!lksb->lksb_conn) |
255 | lksb->lksb_conn = conn; | |
256 | else | |
257 | BUG_ON(lksb->lksb_conn != conn); | |
286eaa95 | 258 | return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
a796d286 | 259 | name, namelen); |
24ef1815 | 260 | } |
286eaa95 | 261 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
24ef1815 | 262 | |
553aa7e4 | 263 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
c0e41338 | 264 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 265 | u32 flags) |
553aa7e4 | 266 | { |
c0e41338 | 267 | BUG_ON(lksb->lksb_conn == NULL); |
553aa7e4 | 268 | |
a796d286 | 269 | return active_stack->sp_ops->dlm_unlock(conn, lksb, flags); |
8f2c9c1b | 270 | } |
286eaa95 | 271 | EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
8f2c9c1b | 272 | |
c0e41338 | 273 | int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 274 | { |
286eaa95 | 275 | return active_stack->sp_ops->lock_status(lksb); |
553aa7e4 | 276 | } |
286eaa95 | 277 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
553aa7e4 | 278 | |
c0e41338 | 279 | int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
280 | { |
281 | return active_stack->sp_ops->lvb_valid(lksb); | |
282 | } | |
283 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid); | |
284 | ||
c0e41338 | 285 | void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 286 | { |
286eaa95 | 287 | return active_stack->sp_ops->lock_lvb(lksb); |
cf0acdcd | 288 | } |
286eaa95 | 289 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
cf0acdcd | 290 | |
c0e41338 | 291 | void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 292 | { |
286eaa95 | 293 | active_stack->sp_ops->dump_lksb(lksb); |
553aa7e4 | 294 | } |
286eaa95 | 295 | EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
553aa7e4 | 296 | |
53da4939 MF |
297 | int ocfs2_stack_supports_plocks(void) |
298 | { | |
009d3750 | 299 | return active_stack && active_stack->sp_ops->plock; |
53da4939 MF |
300 | } |
301 | EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks); | |
302 | ||
303 | /* | |
304 | * ocfs2_plock() can only be safely called if | |
305 | * ocfs2_stack_supports_plocks() returned true | |
306 | */ | |
307 | int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino, | |
308 | struct file *file, int cmd, struct file_lock *fl) | |
309 | { | |
310 | WARN_ON_ONCE(active_stack->sp_ops->plock == NULL); | |
311 | if (active_stack->sp_ops->plock) | |
312 | return active_stack->sp_ops->plock(conn, ino, file, cmd, fl); | |
313 | return -EOPNOTSUPP; | |
314 | } | |
315 | EXPORT_SYMBOL_GPL(ocfs2_plock); | |
316 | ||
9c6c877c | 317 | int ocfs2_cluster_connect(const char *stack_name, |
c74a3bdd GR |
318 | const char *cluster_name, |
319 | int cluster_name_len, | |
9c6c877c | 320 | const char *group, |
4670c46d | 321 | int grouplen, |
553b5eb9 | 322 | struct ocfs2_locking_protocol *lproto, |
4670c46d JB |
323 | void (*recovery_handler)(int node_num, |
324 | void *recovery_data), | |
325 | void *recovery_data, | |
326 | struct ocfs2_cluster_connection **conn) | |
327 | { | |
328 | int rc = 0; | |
329 | struct ocfs2_cluster_connection *new_conn; | |
4670c46d JB |
330 | |
331 | BUG_ON(group == NULL); | |
332 | BUG_ON(conn == NULL); | |
333 | BUG_ON(recovery_handler == NULL); | |
334 | ||
335 | if (grouplen > GROUP_NAME_MAX) { | |
336 | rc = -EINVAL; | |
337 | goto out; | |
338 | } | |
339 | ||
553b5eb9 JB |
340 | if (memcmp(&lproto->lp_max_version, &locking_max_version, |
341 | sizeof(struct ocfs2_protocol_version))) { | |
342 | rc = -EINVAL; | |
343 | goto out; | |
344 | } | |
345 | ||
4670c46d JB |
346 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), |
347 | GFP_KERNEL); | |
348 | if (!new_conn) { | |
349 | rc = -ENOMEM; | |
350 | goto out; | |
351 | } | |
352 | ||
c74a3bdd | 353 | strlcpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1); |
4670c46d | 354 | new_conn->cc_namelen = grouplen; |
d9060742 SL |
355 | if (cluster_name_len) |
356 | strlcpy(new_conn->cc_cluster_name, cluster_name, | |
357 | CLUSTER_NAME_MAX + 1); | |
c74a3bdd | 358 | new_conn->cc_cluster_name_len = cluster_name_len; |
4670c46d JB |
359 | new_conn->cc_recovery_handler = recovery_handler; |
360 | new_conn->cc_recovery_data = recovery_data; | |
361 | ||
110946c8 | 362 | new_conn->cc_proto = lproto; |
4670c46d | 363 | /* Start the new connection at our maximum compatibility level */ |
286eaa95 JB |
364 | new_conn->cc_version = lproto->lp_max_version; |
365 | ||
366 | /* This will pin the stack driver if successful */ | |
9c6c877c | 367 | rc = ocfs2_stack_driver_get(stack_name); |
286eaa95 JB |
368 | if (rc) |
369 | goto out_free; | |
4670c46d | 370 | |
286eaa95 | 371 | rc = active_stack->sp_ops->connect(new_conn); |
553aa7e4 | 372 | if (rc) { |
286eaa95 | 373 | ocfs2_stack_driver_put(); |
4670c46d JB |
374 | goto out_free; |
375 | } | |
376 | ||
4670c46d JB |
377 | *conn = new_conn; |
378 | ||
379 | out_free: | |
553aa7e4 | 380 | if (rc) |
4670c46d | 381 | kfree(new_conn); |
4670c46d JB |
382 | |
383 | out: | |
384 | return rc; | |
385 | } | |
286eaa95 | 386 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
4670c46d | 387 | |
cbe0e331 JB |
388 | /* The caller will ensure all nodes have the same cluster stack */ |
389 | int ocfs2_cluster_connect_agnostic(const char *group, | |
390 | int grouplen, | |
391 | struct ocfs2_locking_protocol *lproto, | |
392 | void (*recovery_handler)(int node_num, | |
393 | void *recovery_data), | |
394 | void *recovery_data, | |
395 | struct ocfs2_cluster_connection **conn) | |
396 | { | |
397 | char *stack_name = NULL; | |
398 | ||
399 | if (cluster_stack_name[0]) | |
400 | stack_name = cluster_stack_name; | |
c74a3bdd GR |
401 | return ocfs2_cluster_connect(stack_name, NULL, 0, group, grouplen, |
402 | lproto, recovery_handler, recovery_data, | |
403 | conn); | |
cbe0e331 JB |
404 | } |
405 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic); | |
406 | ||
286eaa95 JB |
407 | /* If hangup_pending is 0, the stack driver will be dropped */ |
408 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, | |
409 | int hangup_pending) | |
553aa7e4 JB |
410 | { |
411 | int ret; | |
412 | ||
413 | BUG_ON(conn == NULL); | |
414 | ||
2c39450b | 415 | ret = active_stack->sp_ops->disconnect(conn); |
553aa7e4 JB |
416 | |
417 | /* XXX Should we free it anyway? */ | |
286eaa95 | 418 | if (!ret) { |
553aa7e4 | 419 | kfree(conn); |
286eaa95 JB |
420 | if (!hangup_pending) |
421 | ocfs2_stack_driver_put(); | |
422 | } | |
553aa7e4 JB |
423 | |
424 | return ret; | |
425 | } | |
286eaa95 | 426 | EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
553aa7e4 | 427 | |
9f9a99f4 JB |
428 | /* |
429 | * Leave the group for this filesystem. This is executed by a userspace | |
430 | * program (stored in ocfs2_hb_ctl_path). | |
431 | */ | |
432 | static void ocfs2_leave_group(const char *group) | |
433 | { | |
434 | int ret; | |
435 | char *argv[5], *envp[3]; | |
436 | ||
437 | argv[0] = ocfs2_hb_ctl_path; | |
438 | argv[1] = "-K"; | |
439 | argv[2] = "-u"; | |
440 | argv[3] = (char *)group; | |
441 | argv[4] = NULL; | |
442 | ||
443 | /* minimal command environment taken from cpu_run_sbin_hotplug */ | |
444 | envp[0] = "HOME=/"; | |
445 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
446 | envp[2] = NULL; | |
447 | ||
448 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
449 | if (ret < 0) { | |
450 | printk(KERN_ERR | |
451 | "ocfs2: Error %d running user helper " | |
452 | "\"%s %s %s %s\"\n", | |
453 | ret, argv[0], argv[1], argv[2], argv[3]); | |
454 | } | |
455 | } | |
456 | ||
457 | /* | |
458 | * Hangup is a required post-umount. ocfs2-tools software expects the | |
459 | * filesystem to call "ocfs2_hb_ctl" during unmount. This happens | |
460 | * regardless of whether the DLM got started, so we can't do it | |
461 | * in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does | |
462 | * the actual work. | |
463 | */ | |
6953b4c0 JB |
464 | void ocfs2_cluster_hangup(const char *group, int grouplen) |
465 | { | |
466 | BUG_ON(group == NULL); | |
467 | BUG_ON(group[grouplen] != '\0'); | |
468 | ||
9f9a99f4 JB |
469 | ocfs2_leave_group(group); |
470 | ||
286eaa95 JB |
471 | /* cluster_disconnect() was called with hangup_pending==1 */ |
472 | ocfs2_stack_driver_put(); | |
19fdb624 | 473 | } |
286eaa95 | 474 | EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
19fdb624 | 475 | |
3e834151 GR |
476 | int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn, |
477 | unsigned int *node) | |
553aa7e4 | 478 | { |
3e834151 | 479 | return active_stack->sp_ops->this_node(conn, node); |
553aa7e4 | 480 | } |
286eaa95 | 481 | EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
553aa7e4 | 482 | |
286eaa95 | 483 | |
74ae4e10 JB |
484 | /* |
485 | * Sysfs bits | |
486 | */ | |
487 | ||
488 | static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, | |
489 | struct kobj_attribute *attr, | |
490 | char *buf) | |
491 | { | |
492 | ssize_t ret = 0; | |
493 | ||
494 | spin_lock(&ocfs2_stack_lock); | |
553b5eb9 | 495 | if (locking_max_version.pv_major) |
74ae4e10 | 496 | ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", |
553b5eb9 JB |
497 | locking_max_version.pv_major, |
498 | locking_max_version.pv_minor); | |
74ae4e10 JB |
499 | spin_unlock(&ocfs2_stack_lock); |
500 | ||
501 | return ret; | |
502 | } | |
503 | ||
504 | static struct kobj_attribute ocfs2_attr_max_locking_protocol = | |
58f86cc8 | 505 | __ATTR(max_locking_protocol, S_IRUGO, |
74ae4e10 JB |
506 | ocfs2_max_locking_protocol_show, NULL); |
507 | ||
508 | static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, | |
509 | struct kobj_attribute *attr, | |
510 | char *buf) | |
24ef1815 | 511 | { |
74ae4e10 JB |
512 | ssize_t ret = 0, total = 0, remain = PAGE_SIZE; |
513 | struct ocfs2_stack_plugin *p; | |
514 | ||
515 | spin_lock(&ocfs2_stack_lock); | |
516 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
517 | ret = snprintf(buf, remain, "%s\n", | |
518 | p->sp_name); | |
519 | if (ret < 0) { | |
520 | total = ret; | |
521 | break; | |
522 | } | |
523 | if (ret == remain) { | |
524 | /* snprintf() didn't fit */ | |
525 | total = -E2BIG; | |
526 | break; | |
527 | } | |
528 | total += ret; | |
529 | remain -= ret; | |
530 | } | |
531 | spin_unlock(&ocfs2_stack_lock); | |
532 | ||
533 | return total; | |
534 | } | |
535 | ||
536 | static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = | |
58f86cc8 | 537 | __ATTR(loaded_cluster_plugins, S_IRUGO, |
74ae4e10 JB |
538 | ocfs2_loaded_cluster_plugins_show, NULL); |
539 | ||
540 | static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, | |
541 | struct kobj_attribute *attr, | |
542 | char *buf) | |
543 | { | |
544 | ssize_t ret = 0; | |
545 | ||
546 | spin_lock(&ocfs2_stack_lock); | |
547 | if (active_stack) { | |
548 | ret = snprintf(buf, PAGE_SIZE, "%s\n", | |
549 | active_stack->sp_name); | |
550 | if (ret == PAGE_SIZE) | |
551 | ret = -E2BIG; | |
552 | } | |
553 | spin_unlock(&ocfs2_stack_lock); | |
554 | ||
555 | return ret; | |
556 | } | |
557 | ||
558 | static struct kobj_attribute ocfs2_attr_active_cluster_plugin = | |
58f86cc8 | 559 | __ATTR(active_cluster_plugin, S_IRUGO, |
74ae4e10 JB |
560 | ocfs2_active_cluster_plugin_show, NULL); |
561 | ||
9c6c877c JB |
562 | static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj, |
563 | struct kobj_attribute *attr, | |
564 | char *buf) | |
565 | { | |
566 | ssize_t ret; | |
567 | spin_lock(&ocfs2_stack_lock); | |
568 | ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name); | |
569 | spin_unlock(&ocfs2_stack_lock); | |
570 | ||
571 | return ret; | |
572 | } | |
573 | ||
574 | static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj, | |
575 | struct kobj_attribute *attr, | |
576 | const char *buf, size_t count) | |
577 | { | |
578 | size_t len = count; | |
579 | ssize_t ret; | |
580 | ||
581 | if (len == 0) | |
582 | return len; | |
583 | ||
584 | if (buf[len - 1] == '\n') | |
585 | len--; | |
586 | ||
587 | if ((len != OCFS2_STACK_LABEL_LEN) || | |
588 | (strnlen(buf, len) != len)) | |
589 | return -EINVAL; | |
590 | ||
591 | spin_lock(&ocfs2_stack_lock); | |
592 | if (active_stack) { | |
593 | if (!strncmp(buf, cluster_stack_name, len)) | |
594 | ret = count; | |
595 | else | |
596 | ret = -EBUSY; | |
597 | } else { | |
598 | memcpy(cluster_stack_name, buf, len); | |
599 | ret = count; | |
600 | } | |
601 | spin_unlock(&ocfs2_stack_lock); | |
602 | ||
603 | return ret; | |
604 | } | |
605 | ||
606 | ||
607 | static struct kobj_attribute ocfs2_attr_cluster_stack = | |
58f86cc8 | 608 | __ATTR(cluster_stack, S_IRUGO | S_IWUSR, |
9c6c877c JB |
609 | ocfs2_cluster_stack_show, |
610 | ocfs2_cluster_stack_store); | |
611 | ||
765aabbb GR |
612 | |
613 | ||
614 | static ssize_t ocfs2_dlm_recover_show(struct kobject *kobj, | |
615 | struct kobj_attribute *attr, | |
616 | char *buf) | |
617 | { | |
618 | return snprintf(buf, PAGE_SIZE, "1\n"); | |
619 | } | |
620 | ||
621 | static struct kobj_attribute ocfs2_attr_dlm_recover_support = | |
622 | __ATTR(dlm_recover_callback_support, S_IRUGO, | |
623 | ocfs2_dlm_recover_show, NULL); | |
624 | ||
74ae4e10 JB |
625 | static struct attribute *ocfs2_attrs[] = { |
626 | &ocfs2_attr_max_locking_protocol.attr, | |
627 | &ocfs2_attr_loaded_cluster_plugins.attr, | |
628 | &ocfs2_attr_active_cluster_plugin.attr, | |
9c6c877c | 629 | &ocfs2_attr_cluster_stack.attr, |
765aabbb | 630 | &ocfs2_attr_dlm_recover_support.attr, |
74ae4e10 JB |
631 | NULL, |
632 | }; | |
633 | ||
634 | static struct attribute_group ocfs2_attr_group = { | |
635 | .attrs = ocfs2_attrs, | |
636 | }; | |
637 | ||
9dde5e4f GH |
638 | struct kset *ocfs2_kset; |
639 | EXPORT_SYMBOL_GPL(ocfs2_kset); | |
74ae4e10 JB |
640 | |
641 | static void ocfs2_sysfs_exit(void) | |
642 | { | |
643 | kset_unregister(ocfs2_kset); | |
644 | } | |
645 | ||
646 | static int ocfs2_sysfs_init(void) | |
647 | { | |
648 | int ret; | |
649 | ||
650 | ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); | |
651 | if (!ocfs2_kset) | |
652 | return -ENOMEM; | |
653 | ||
654 | ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); | |
655 | if (ret) | |
656 | goto error; | |
657 | ||
286eaa95 | 658 | return 0; |
74ae4e10 JB |
659 | |
660 | error: | |
661 | kset_unregister(ocfs2_kset); | |
662 | return ret; | |
663 | } | |
664 | ||
3878f110 JB |
665 | /* |
666 | * Sysctl bits | |
667 | * | |
668 | * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't | |
669 | * make as much sense in a multiple cluster stack world, but it's safer | |
670 | * and easier to preserve the name. | |
671 | */ | |
672 | ||
673 | #define FS_OCFS2_NM 1 | |
674 | ||
d00d2f8a | 675 | static struct ctl_table ocfs2_nm_table[] = { |
3878f110 | 676 | { |
3878f110 JB |
677 | .procname = "hb_ctl_path", |
678 | .data = ocfs2_hb_ctl_path, | |
679 | .maxlen = OCFS2_MAX_HB_CTL_PATH, | |
680 | .mode = 0644, | |
6d456111 | 681 | .proc_handler = proc_dostring, |
3878f110 | 682 | }, |
ab09203e | 683 | { } |
3878f110 JB |
684 | }; |
685 | ||
d00d2f8a | 686 | static struct ctl_table ocfs2_mod_table[] = { |
3878f110 | 687 | { |
3878f110 JB |
688 | .procname = "nm", |
689 | .data = NULL, | |
690 | .maxlen = 0, | |
691 | .mode = 0555, | |
692 | .child = ocfs2_nm_table | |
693 | }, | |
ab09203e | 694 | { } |
3878f110 JB |
695 | }; |
696 | ||
d00d2f8a | 697 | static struct ctl_table ocfs2_kern_table[] = { |
3878f110 | 698 | { |
3878f110 JB |
699 | .procname = "ocfs2", |
700 | .data = NULL, | |
701 | .maxlen = 0, | |
702 | .mode = 0555, | |
703 | .child = ocfs2_mod_table | |
704 | }, | |
ab09203e | 705 | { } |
3878f110 JB |
706 | }; |
707 | ||
d00d2f8a | 708 | static struct ctl_table ocfs2_root_table[] = { |
3878f110 | 709 | { |
3878f110 JB |
710 | .procname = "fs", |
711 | .data = NULL, | |
712 | .maxlen = 0, | |
713 | .mode = 0555, | |
714 | .child = ocfs2_kern_table | |
715 | }, | |
ab09203e | 716 | { } |
3878f110 JB |
717 | }; |
718 | ||
1a5c4e2a | 719 | static struct ctl_table_header *ocfs2_table_header; |
3878f110 | 720 | |
3878f110 JB |
721 | |
722 | /* | |
723 | * Initialization | |
724 | */ | |
725 | ||
74ae4e10 JB |
726 | static int __init ocfs2_stack_glue_init(void) |
727 | { | |
9c6c877c JB |
728 | strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
729 | ||
3878f110 JB |
730 | ocfs2_table_header = register_sysctl_table(ocfs2_root_table); |
731 | if (!ocfs2_table_header) { | |
732 | printk(KERN_ERR | |
733 | "ocfs2 stack glue: unable to register sysctl\n"); | |
734 | return -ENOMEM; /* or something. */ | |
735 | } | |
736 | ||
74ae4e10 | 737 | return ocfs2_sysfs_init(); |
286eaa95 | 738 | } |
24ef1815 | 739 | |
286eaa95 JB |
740 | static void __exit ocfs2_stack_glue_exit(void) |
741 | { | |
553b5eb9 JB |
742 | memset(&locking_max_version, 0, |
743 | sizeof(struct ocfs2_protocol_version)); | |
74ae4e10 | 744 | ocfs2_sysfs_exit(); |
3878f110 JB |
745 | if (ocfs2_table_header) |
746 | unregister_sysctl_table(ocfs2_table_header); | |
24ef1815 JB |
747 | } |
748 | ||
286eaa95 JB |
749 | MODULE_AUTHOR("Oracle"); |
750 | MODULE_DESCRIPTION("ocfs2 cluter stack glue layer"); | |
751 | MODULE_LICENSE("GPL"); | |
752 | module_init(ocfs2_stack_glue_init); | |
753 | module_exit(ocfs2_stack_glue_exit); |