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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 | ||
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 | ||
9c6c877c JB |
65 | static int ocfs2_stack_driver_request(const char *stack_name, |
66 | const char *plugin_name) | |
286eaa95 JB |
67 | { |
68 | int rc; | |
69 | struct ocfs2_stack_plugin *p; | |
70 | ||
71 | spin_lock(&ocfs2_stack_lock); | |
72 | ||
9c6c877c JB |
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 | ||
286eaa95 JB |
82 | if (active_stack) { |
83 | /* | |
84 | * If the active stack isn't the one we want, it cannot | |
85 | * be selected right now. | |
86 | */ | |
9c6c877c | 87 | if (!strcmp(active_stack->sp_name, plugin_name)) |
286eaa95 JB |
88 | rc = 0; |
89 | else | |
90 | rc = -EBUSY; | |
91 | goto out; | |
92 | } | |
93 | ||
9c6c877c | 94 | p = ocfs2_stack_lookup(plugin_name); |
286eaa95 JB |
95 | if (!p || !try_module_get(p->sp_owner)) { |
96 | rc = -ENOENT; | |
97 | goto out; | |
98 | } | |
99 | ||
286eaa95 | 100 | active_stack = p; |
286eaa95 JB |
101 | rc = 0; |
102 | ||
103 | out: | |
d6817cdb JB |
104 | /* If we found it, pin it */ |
105 | if (!rc) | |
106 | active_stack->sp_count++; | |
107 | ||
286eaa95 JB |
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 | */ | |
9c6c877c | 117 | static int ocfs2_stack_driver_get(const char *stack_name) |
286eaa95 JB |
118 | { |
119 | int rc; | |
9c6c877c JB |
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 | } | |
286eaa95 | 135 | |
9c6c877c JB |
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); | |
286eaa95 | 141 | if (rc == -ENOENT) { |
9c6c877c JB |
142 | request_module("ocfs2_stack_%s", plugin_name); |
143 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 JB |
144 | } |
145 | ||
146 | if (rc == -ENOENT) { | |
147 | printk(KERN_ERR | |
148 | "ocfs2: Cluster stack driver \"%s\" cannot be found\n", | |
9c6c877c | 149 | plugin_name); |
286eaa95 JB |
150 | } else if (rc == -EBUSY) { |
151 | printk(KERN_ERR | |
9c6c877c | 152 | "ocfs2: A different cluster stack is in use\n"); |
286eaa95 JB |
153 | } |
154 | ||
155 | return rc; | |
156 | } | |
24ef1815 | 157 | |
286eaa95 JB |
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; | |
553b5eb9 | 179 | plugin->sp_max_proto = locking_max_version; |
286eaa95 JB |
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 | ||
553b5eb9 | 216 | void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto) |
286eaa95 JB |
217 | { |
218 | struct ocfs2_stack_plugin *p; | |
219 | ||
286eaa95 | 220 | spin_lock(&ocfs2_stack_lock); |
553b5eb9 JB |
221 | if (memcmp(max_proto, &locking_max_version, |
222 | sizeof(struct ocfs2_protocol_version))) { | |
223 | BUG_ON(locking_max_version.pv_major != 0); | |
286eaa95 | 224 | |
553b5eb9 JB |
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 | } | |
286eaa95 | 229 | } |
286eaa95 JB |
230 | spin_unlock(&ocfs2_stack_lock); |
231 | } | |
553b5eb9 | 232 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version); |
7431cd7e | 233 | |
24ef1815 | 234 | |
cf4d8d75 | 235 | /* |
a796d286 JB |
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. | |
cf4d8d75 | 240 | */ |
553aa7e4 JB |
241 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
242 | int mode, | |
c0e41338 | 243 | struct ocfs2_dlm_lksb *lksb, |
553aa7e4 JB |
244 | u32 flags, |
245 | void *name, | |
a796d286 | 246 | unsigned int namelen) |
553aa7e4 | 247 | { |
c0e41338 JB |
248 | if (!lksb->lksb_conn) |
249 | lksb->lksb_conn = conn; | |
250 | else | |
251 | BUG_ON(lksb->lksb_conn != conn); | |
286eaa95 | 252 | return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
a796d286 | 253 | name, namelen); |
24ef1815 | 254 | } |
286eaa95 | 255 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
24ef1815 | 256 | |
553aa7e4 | 257 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
c0e41338 | 258 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 259 | u32 flags) |
553aa7e4 | 260 | { |
c0e41338 | 261 | BUG_ON(lksb->lksb_conn == NULL); |
553aa7e4 | 262 | |
a796d286 | 263 | return active_stack->sp_ops->dlm_unlock(conn, lksb, flags); |
8f2c9c1b | 264 | } |
286eaa95 | 265 | EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
8f2c9c1b | 266 | |
c0e41338 | 267 | int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 268 | { |
286eaa95 | 269 | return active_stack->sp_ops->lock_status(lksb); |
553aa7e4 | 270 | } |
286eaa95 | 271 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
553aa7e4 | 272 | |
c0e41338 | 273 | int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
274 | { |
275 | return active_stack->sp_ops->lvb_valid(lksb); | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid); | |
278 | ||
c0e41338 | 279 | void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 280 | { |
286eaa95 | 281 | return active_stack->sp_ops->lock_lvb(lksb); |
cf0acdcd | 282 | } |
286eaa95 | 283 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
cf0acdcd | 284 | |
c0e41338 | 285 | void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 286 | { |
286eaa95 | 287 | active_stack->sp_ops->dump_lksb(lksb); |
553aa7e4 | 288 | } |
286eaa95 | 289 | EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
553aa7e4 | 290 | |
53da4939 MF |
291 | int ocfs2_stack_supports_plocks(void) |
292 | { | |
009d3750 | 293 | return active_stack && active_stack->sp_ops->plock; |
53da4939 MF |
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 | ||
9c6c877c | 311 | int ocfs2_cluster_connect(const char *stack_name, |
c74a3bdd GR |
312 | const char *cluster_name, |
313 | int cluster_name_len, | |
9c6c877c | 314 | const char *group, |
4670c46d | 315 | int grouplen, |
553b5eb9 | 316 | struct ocfs2_locking_protocol *lproto, |
4670c46d JB |
317 | void (*recovery_handler)(int node_num, |
318 | void *recovery_data), | |
319 | void *recovery_data, | |
320 | struct ocfs2_cluster_connection **conn) | |
321 | { | |
322 | int rc = 0; | |
323 | struct ocfs2_cluster_connection *new_conn; | |
4670c46d JB |
324 | |
325 | BUG_ON(group == NULL); | |
326 | BUG_ON(conn == NULL); | |
327 | BUG_ON(recovery_handler == NULL); | |
328 | ||
329 | if (grouplen > GROUP_NAME_MAX) { | |
330 | rc = -EINVAL; | |
331 | goto out; | |
332 | } | |
333 | ||
553b5eb9 JB |
334 | if (memcmp(&lproto->lp_max_version, &locking_max_version, |
335 | sizeof(struct ocfs2_protocol_version))) { | |
336 | rc = -EINVAL; | |
337 | goto out; | |
338 | } | |
339 | ||
4670c46d JB |
340 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), |
341 | GFP_KERNEL); | |
342 | if (!new_conn) { | |
343 | rc = -ENOMEM; | |
344 | goto out; | |
345 | } | |
346 | ||
c74a3bdd | 347 | strlcpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1); |
4670c46d | 348 | new_conn->cc_namelen = grouplen; |
c74a3bdd GR |
349 | strlcpy(new_conn->cc_cluster_name, cluster_name, CLUSTER_NAME_MAX + 1); |
350 | new_conn->cc_cluster_name_len = cluster_name_len; | |
4670c46d JB |
351 | new_conn->cc_recovery_handler = recovery_handler; |
352 | new_conn->cc_recovery_data = recovery_data; | |
353 | ||
110946c8 | 354 | new_conn->cc_proto = lproto; |
4670c46d | 355 | /* Start the new connection at our maximum compatibility level */ |
286eaa95 JB |
356 | new_conn->cc_version = lproto->lp_max_version; |
357 | ||
358 | /* This will pin the stack driver if successful */ | |
9c6c877c | 359 | rc = ocfs2_stack_driver_get(stack_name); |
286eaa95 JB |
360 | if (rc) |
361 | goto out_free; | |
4670c46d | 362 | |
286eaa95 | 363 | rc = active_stack->sp_ops->connect(new_conn); |
553aa7e4 | 364 | if (rc) { |
286eaa95 | 365 | ocfs2_stack_driver_put(); |
4670c46d JB |
366 | goto out_free; |
367 | } | |
368 | ||
4670c46d JB |
369 | *conn = new_conn; |
370 | ||
371 | out_free: | |
553aa7e4 | 372 | if (rc) |
4670c46d | 373 | kfree(new_conn); |
4670c46d JB |
374 | |
375 | out: | |
376 | return rc; | |
377 | } | |
286eaa95 | 378 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
4670c46d | 379 | |
cbe0e331 JB |
380 | /* The caller will ensure all nodes have the same cluster stack */ |
381 | int ocfs2_cluster_connect_agnostic(const char *group, | |
382 | int grouplen, | |
383 | struct ocfs2_locking_protocol *lproto, | |
384 | void (*recovery_handler)(int node_num, | |
385 | void *recovery_data), | |
386 | void *recovery_data, | |
387 | struct ocfs2_cluster_connection **conn) | |
388 | { | |
389 | char *stack_name = NULL; | |
390 | ||
391 | if (cluster_stack_name[0]) | |
392 | stack_name = cluster_stack_name; | |
c74a3bdd GR |
393 | return ocfs2_cluster_connect(stack_name, NULL, 0, group, grouplen, |
394 | lproto, recovery_handler, recovery_data, | |
395 | conn); | |
cbe0e331 JB |
396 | } |
397 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic); | |
398 | ||
286eaa95 JB |
399 | /* If hangup_pending is 0, the stack driver will be dropped */ |
400 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, | |
401 | int hangup_pending) | |
553aa7e4 JB |
402 | { |
403 | int ret; | |
404 | ||
405 | BUG_ON(conn == NULL); | |
406 | ||
2c39450b | 407 | ret = active_stack->sp_ops->disconnect(conn); |
553aa7e4 JB |
408 | |
409 | /* XXX Should we free it anyway? */ | |
286eaa95 | 410 | if (!ret) { |
553aa7e4 | 411 | kfree(conn); |
286eaa95 JB |
412 | if (!hangup_pending) |
413 | ocfs2_stack_driver_put(); | |
414 | } | |
553aa7e4 JB |
415 | |
416 | return ret; | |
417 | } | |
286eaa95 | 418 | EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
553aa7e4 | 419 | |
9f9a99f4 JB |
420 | /* |
421 | * Leave the group for this filesystem. This is executed by a userspace | |
422 | * program (stored in ocfs2_hb_ctl_path). | |
423 | */ | |
424 | static void ocfs2_leave_group(const char *group) | |
425 | { | |
426 | int ret; | |
427 | char *argv[5], *envp[3]; | |
428 | ||
429 | argv[0] = ocfs2_hb_ctl_path; | |
430 | argv[1] = "-K"; | |
431 | argv[2] = "-u"; | |
432 | argv[3] = (char *)group; | |
433 | argv[4] = NULL; | |
434 | ||
435 | /* minimal command environment taken from cpu_run_sbin_hotplug */ | |
436 | envp[0] = "HOME=/"; | |
437 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
438 | envp[2] = NULL; | |
439 | ||
440 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
441 | if (ret < 0) { | |
442 | printk(KERN_ERR | |
443 | "ocfs2: Error %d running user helper " | |
444 | "\"%s %s %s %s\"\n", | |
445 | ret, argv[0], argv[1], argv[2], argv[3]); | |
446 | } | |
447 | } | |
448 | ||
449 | /* | |
450 | * Hangup is a required post-umount. ocfs2-tools software expects the | |
451 | * filesystem to call "ocfs2_hb_ctl" during unmount. This happens | |
452 | * regardless of whether the DLM got started, so we can't do it | |
453 | * in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does | |
454 | * the actual work. | |
455 | */ | |
6953b4c0 JB |
456 | void ocfs2_cluster_hangup(const char *group, int grouplen) |
457 | { | |
458 | BUG_ON(group == NULL); | |
459 | BUG_ON(group[grouplen] != '\0'); | |
460 | ||
9f9a99f4 JB |
461 | ocfs2_leave_group(group); |
462 | ||
286eaa95 JB |
463 | /* cluster_disconnect() was called with hangup_pending==1 */ |
464 | ocfs2_stack_driver_put(); | |
19fdb624 | 465 | } |
286eaa95 | 466 | EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
19fdb624 | 467 | |
3e834151 GR |
468 | int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn, |
469 | unsigned int *node) | |
553aa7e4 | 470 | { |
3e834151 | 471 | return active_stack->sp_ops->this_node(conn, node); |
553aa7e4 | 472 | } |
286eaa95 | 473 | EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
553aa7e4 | 474 | |
286eaa95 | 475 | |
74ae4e10 JB |
476 | /* |
477 | * Sysfs bits | |
478 | */ | |
479 | ||
480 | static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, | |
481 | struct kobj_attribute *attr, | |
482 | char *buf) | |
483 | { | |
484 | ssize_t ret = 0; | |
485 | ||
486 | spin_lock(&ocfs2_stack_lock); | |
553b5eb9 | 487 | if (locking_max_version.pv_major) |
74ae4e10 | 488 | ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", |
553b5eb9 JB |
489 | locking_max_version.pv_major, |
490 | locking_max_version.pv_minor); | |
74ae4e10 JB |
491 | spin_unlock(&ocfs2_stack_lock); |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
496 | static struct kobj_attribute ocfs2_attr_max_locking_protocol = | |
497 | __ATTR(max_locking_protocol, S_IFREG | S_IRUGO, | |
498 | ocfs2_max_locking_protocol_show, NULL); | |
499 | ||
500 | static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, | |
501 | struct kobj_attribute *attr, | |
502 | char *buf) | |
24ef1815 | 503 | { |
74ae4e10 JB |
504 | ssize_t ret = 0, total = 0, remain = PAGE_SIZE; |
505 | struct ocfs2_stack_plugin *p; | |
506 | ||
507 | spin_lock(&ocfs2_stack_lock); | |
508 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
509 | ret = snprintf(buf, remain, "%s\n", | |
510 | p->sp_name); | |
511 | if (ret < 0) { | |
512 | total = ret; | |
513 | break; | |
514 | } | |
515 | if (ret == remain) { | |
516 | /* snprintf() didn't fit */ | |
517 | total = -E2BIG; | |
518 | break; | |
519 | } | |
520 | total += ret; | |
521 | remain -= ret; | |
522 | } | |
523 | spin_unlock(&ocfs2_stack_lock); | |
524 | ||
525 | return total; | |
526 | } | |
527 | ||
528 | static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = | |
529 | __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO, | |
530 | ocfs2_loaded_cluster_plugins_show, NULL); | |
531 | ||
532 | static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, | |
533 | struct kobj_attribute *attr, | |
534 | char *buf) | |
535 | { | |
536 | ssize_t ret = 0; | |
537 | ||
538 | spin_lock(&ocfs2_stack_lock); | |
539 | if (active_stack) { | |
540 | ret = snprintf(buf, PAGE_SIZE, "%s\n", | |
541 | active_stack->sp_name); | |
542 | if (ret == PAGE_SIZE) | |
543 | ret = -E2BIG; | |
544 | } | |
545 | spin_unlock(&ocfs2_stack_lock); | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | static struct kobj_attribute ocfs2_attr_active_cluster_plugin = | |
551 | __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO, | |
552 | ocfs2_active_cluster_plugin_show, NULL); | |
553 | ||
9c6c877c JB |
554 | static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj, |
555 | struct kobj_attribute *attr, | |
556 | char *buf) | |
557 | { | |
558 | ssize_t ret; | |
559 | spin_lock(&ocfs2_stack_lock); | |
560 | ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name); | |
561 | spin_unlock(&ocfs2_stack_lock); | |
562 | ||
563 | return ret; | |
564 | } | |
565 | ||
566 | static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj, | |
567 | struct kobj_attribute *attr, | |
568 | const char *buf, size_t count) | |
569 | { | |
570 | size_t len = count; | |
571 | ssize_t ret; | |
572 | ||
573 | if (len == 0) | |
574 | return len; | |
575 | ||
576 | if (buf[len - 1] == '\n') | |
577 | len--; | |
578 | ||
579 | if ((len != OCFS2_STACK_LABEL_LEN) || | |
580 | (strnlen(buf, len) != len)) | |
581 | return -EINVAL; | |
582 | ||
583 | spin_lock(&ocfs2_stack_lock); | |
584 | if (active_stack) { | |
585 | if (!strncmp(buf, cluster_stack_name, len)) | |
586 | ret = count; | |
587 | else | |
588 | ret = -EBUSY; | |
589 | } else { | |
590 | memcpy(cluster_stack_name, buf, len); | |
591 | ret = count; | |
592 | } | |
593 | spin_unlock(&ocfs2_stack_lock); | |
594 | ||
595 | return ret; | |
596 | } | |
597 | ||
598 | ||
599 | static struct kobj_attribute ocfs2_attr_cluster_stack = | |
600 | __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR, | |
601 | ocfs2_cluster_stack_show, | |
602 | ocfs2_cluster_stack_store); | |
603 | ||
74ae4e10 JB |
604 | static struct attribute *ocfs2_attrs[] = { |
605 | &ocfs2_attr_max_locking_protocol.attr, | |
606 | &ocfs2_attr_loaded_cluster_plugins.attr, | |
607 | &ocfs2_attr_active_cluster_plugin.attr, | |
9c6c877c | 608 | &ocfs2_attr_cluster_stack.attr, |
74ae4e10 JB |
609 | NULL, |
610 | }; | |
611 | ||
612 | static struct attribute_group ocfs2_attr_group = { | |
613 | .attrs = ocfs2_attrs, | |
614 | }; | |
615 | ||
616 | static struct kset *ocfs2_kset; | |
617 | ||
618 | static void ocfs2_sysfs_exit(void) | |
619 | { | |
620 | kset_unregister(ocfs2_kset); | |
621 | } | |
622 | ||
623 | static int ocfs2_sysfs_init(void) | |
624 | { | |
625 | int ret; | |
626 | ||
627 | ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); | |
628 | if (!ocfs2_kset) | |
629 | return -ENOMEM; | |
630 | ||
631 | ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); | |
632 | if (ret) | |
633 | goto error; | |
634 | ||
286eaa95 | 635 | return 0; |
74ae4e10 JB |
636 | |
637 | error: | |
638 | kset_unregister(ocfs2_kset); | |
639 | return ret; | |
640 | } | |
641 | ||
3878f110 JB |
642 | /* |
643 | * Sysctl bits | |
644 | * | |
645 | * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't | |
646 | * make as much sense in a multiple cluster stack world, but it's safer | |
647 | * and easier to preserve the name. | |
648 | */ | |
649 | ||
650 | #define FS_OCFS2_NM 1 | |
651 | ||
d00d2f8a | 652 | static struct ctl_table ocfs2_nm_table[] = { |
3878f110 | 653 | { |
3878f110 JB |
654 | .procname = "hb_ctl_path", |
655 | .data = ocfs2_hb_ctl_path, | |
656 | .maxlen = OCFS2_MAX_HB_CTL_PATH, | |
657 | .mode = 0644, | |
6d456111 | 658 | .proc_handler = proc_dostring, |
3878f110 | 659 | }, |
ab09203e | 660 | { } |
3878f110 JB |
661 | }; |
662 | ||
d00d2f8a | 663 | static struct ctl_table ocfs2_mod_table[] = { |
3878f110 | 664 | { |
3878f110 JB |
665 | .procname = "nm", |
666 | .data = NULL, | |
667 | .maxlen = 0, | |
668 | .mode = 0555, | |
669 | .child = ocfs2_nm_table | |
670 | }, | |
ab09203e | 671 | { } |
3878f110 JB |
672 | }; |
673 | ||
d00d2f8a | 674 | static struct ctl_table ocfs2_kern_table[] = { |
3878f110 | 675 | { |
3878f110 JB |
676 | .procname = "ocfs2", |
677 | .data = NULL, | |
678 | .maxlen = 0, | |
679 | .mode = 0555, | |
680 | .child = ocfs2_mod_table | |
681 | }, | |
ab09203e | 682 | { } |
3878f110 JB |
683 | }; |
684 | ||
d00d2f8a | 685 | static struct ctl_table ocfs2_root_table[] = { |
3878f110 | 686 | { |
3878f110 JB |
687 | .procname = "fs", |
688 | .data = NULL, | |
689 | .maxlen = 0, | |
690 | .mode = 0555, | |
691 | .child = ocfs2_kern_table | |
692 | }, | |
ab09203e | 693 | { } |
3878f110 JB |
694 | }; |
695 | ||
696 | static struct ctl_table_header *ocfs2_table_header = NULL; | |
697 | ||
3878f110 JB |
698 | |
699 | /* | |
700 | * Initialization | |
701 | */ | |
702 | ||
74ae4e10 JB |
703 | static int __init ocfs2_stack_glue_init(void) |
704 | { | |
9c6c877c JB |
705 | strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
706 | ||
3878f110 JB |
707 | ocfs2_table_header = register_sysctl_table(ocfs2_root_table); |
708 | if (!ocfs2_table_header) { | |
709 | printk(KERN_ERR | |
710 | "ocfs2 stack glue: unable to register sysctl\n"); | |
711 | return -ENOMEM; /* or something. */ | |
712 | } | |
713 | ||
74ae4e10 | 714 | return ocfs2_sysfs_init(); |
286eaa95 | 715 | } |
24ef1815 | 716 | |
286eaa95 JB |
717 | static void __exit ocfs2_stack_glue_exit(void) |
718 | { | |
553b5eb9 JB |
719 | memset(&locking_max_version, 0, |
720 | sizeof(struct ocfs2_protocol_version)); | |
721 | locking_max_version.pv_major = 0; | |
722 | locking_max_version.pv_minor = 0; | |
74ae4e10 | 723 | ocfs2_sysfs_exit(); |
3878f110 JB |
724 | if (ocfs2_table_header) |
725 | unregister_sysctl_table(ocfs2_table_header); | |
24ef1815 JB |
726 | } |
727 | ||
286eaa95 JB |
728 | MODULE_AUTHOR("Oracle"); |
729 | MODULE_DESCRIPTION("ocfs2 cluter stack glue layer"); | |
730 | MODULE_LICENSE("GPL"); | |
731 | module_init(ocfs2_stack_glue_init); | |
732 | module_exit(ocfs2_stack_glue_exit); |