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50acfb2b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
24ef1815 JB |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * stackglue.c | |
6 | * | |
7 | * Code which implements an OCFS2 specific interface to underlying | |
8 | * cluster stacks. | |
9 | * | |
1c520dfb | 10 | * Copyright (C) 2007, 2009 Oracle. All rights reserved. |
24ef1815 JB |
11 | */ |
12 | ||
286eaa95 JB |
13 | #include <linux/list.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/module.h> | |
4670c46d | 16 | #include <linux/slab.h> |
6953b4c0 | 17 | #include <linux/kmod.h> |
74ae4e10 JB |
18 | #include <linux/fs.h> |
19 | #include <linux/kobject.h> | |
20 | #include <linux/sysfs.h> | |
3878f110 | 21 | #include <linux/sysctl.h> |
4670c46d | 22 | |
9c6c877c JB |
23 | #include "ocfs2_fs.h" |
24 | ||
286eaa95 | 25 | #include "stackglue.h" |
4670c46d | 26 | |
9c6c877c JB |
27 | #define OCFS2_STACK_PLUGIN_O2CB "o2cb" |
28 | #define OCFS2_STACK_PLUGIN_USER "user" | |
9f9a99f4 | 29 | #define OCFS2_MAX_HB_CTL_PATH 256 |
9c6c877c | 30 | |
553b5eb9 | 31 | static struct ocfs2_protocol_version locking_max_version; |
286eaa95 JB |
32 | static DEFINE_SPINLOCK(ocfs2_stack_lock); |
33 | static LIST_HEAD(ocfs2_stack_list); | |
9c6c877c | 34 | static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1]; |
9f9a99f4 | 35 | static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; |
19fdb624 | 36 | |
286eaa95 JB |
37 | /* |
38 | * The stack currently in use. If not null, active_stack->sp_count > 0, | |
39 | * the module is pinned, and the locking protocol cannot be changed. | |
40 | */ | |
41 | static struct ocfs2_stack_plugin *active_stack; | |
42 | ||
43 | static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name) | |
44 | { | |
45 | struct ocfs2_stack_plugin *p; | |
46 | ||
47 | assert_spin_locked(&ocfs2_stack_lock); | |
48 | ||
49 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
50 | if (!strcmp(p->sp_name, name)) | |
51 | return p; | |
52 | } | |
53 | ||
54 | return NULL; | |
55 | } | |
56 | ||
9c6c877c JB |
57 | static int ocfs2_stack_driver_request(const char *stack_name, |
58 | const char *plugin_name) | |
286eaa95 JB |
59 | { |
60 | int rc; | |
61 | struct ocfs2_stack_plugin *p; | |
62 | ||
63 | spin_lock(&ocfs2_stack_lock); | |
64 | ||
9c6c877c JB |
65 | /* |
66 | * If the stack passed by the filesystem isn't the selected one, | |
67 | * we can't continue. | |
68 | */ | |
69 | if (strcmp(stack_name, cluster_stack_name)) { | |
70 | rc = -EBUSY; | |
71 | goto out; | |
72 | } | |
73 | ||
286eaa95 JB |
74 | if (active_stack) { |
75 | /* | |
76 | * If the active stack isn't the one we want, it cannot | |
77 | * be selected right now. | |
78 | */ | |
9c6c877c | 79 | if (!strcmp(active_stack->sp_name, plugin_name)) |
286eaa95 JB |
80 | rc = 0; |
81 | else | |
82 | rc = -EBUSY; | |
83 | goto out; | |
84 | } | |
85 | ||
9c6c877c | 86 | p = ocfs2_stack_lookup(plugin_name); |
286eaa95 JB |
87 | if (!p || !try_module_get(p->sp_owner)) { |
88 | rc = -ENOENT; | |
89 | goto out; | |
90 | } | |
91 | ||
286eaa95 | 92 | active_stack = p; |
286eaa95 JB |
93 | rc = 0; |
94 | ||
95 | out: | |
d6817cdb JB |
96 | /* If we found it, pin it */ |
97 | if (!rc) | |
98 | active_stack->sp_count++; | |
99 | ||
286eaa95 JB |
100 | spin_unlock(&ocfs2_stack_lock); |
101 | return rc; | |
102 | } | |
103 | ||
104 | /* | |
105 | * This function looks up the appropriate stack and makes it active. If | |
106 | * there is no stack, it tries to load it. It will fail if the stack still | |
107 | * cannot be found. It will also fail if a different stack is in use. | |
108 | */ | |
9c6c877c | 109 | static int ocfs2_stack_driver_get(const char *stack_name) |
286eaa95 JB |
110 | { |
111 | int rc; | |
9c6c877c JB |
112 | char *plugin_name = OCFS2_STACK_PLUGIN_O2CB; |
113 | ||
114 | /* | |
115 | * Classic stack does not pass in a stack name. This is | |
116 | * compatible with older tools as well. | |
117 | */ | |
118 | if (!stack_name || !*stack_name) | |
119 | stack_name = OCFS2_STACK_PLUGIN_O2CB; | |
120 | ||
121 | if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) { | |
122 | printk(KERN_ERR | |
123 | "ocfs2 passed an invalid cluster stack label: \"%s\"\n", | |
124 | stack_name); | |
125 | return -EINVAL; | |
126 | } | |
286eaa95 | 127 | |
9c6c877c JB |
128 | /* Anything that isn't the classic stack is a user stack */ |
129 | if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB)) | |
130 | plugin_name = OCFS2_STACK_PLUGIN_USER; | |
131 | ||
132 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 | 133 | if (rc == -ENOENT) { |
9c6c877c JB |
134 | request_module("ocfs2_stack_%s", plugin_name); |
135 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); | |
286eaa95 JB |
136 | } |
137 | ||
138 | if (rc == -ENOENT) { | |
139 | printk(KERN_ERR | |
140 | "ocfs2: Cluster stack driver \"%s\" cannot be found\n", | |
9c6c877c | 141 | plugin_name); |
286eaa95 JB |
142 | } else if (rc == -EBUSY) { |
143 | printk(KERN_ERR | |
9c6c877c | 144 | "ocfs2: A different cluster stack is in use\n"); |
286eaa95 JB |
145 | } |
146 | ||
147 | return rc; | |
148 | } | |
24ef1815 | 149 | |
286eaa95 JB |
150 | static void ocfs2_stack_driver_put(void) |
151 | { | |
152 | spin_lock(&ocfs2_stack_lock); | |
153 | BUG_ON(active_stack == NULL); | |
154 | BUG_ON(active_stack->sp_count == 0); | |
155 | ||
156 | active_stack->sp_count--; | |
157 | if (!active_stack->sp_count) { | |
158 | module_put(active_stack->sp_owner); | |
159 | active_stack = NULL; | |
160 | } | |
161 | spin_unlock(&ocfs2_stack_lock); | |
162 | } | |
163 | ||
164 | int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin) | |
165 | { | |
166 | int rc; | |
167 | ||
168 | spin_lock(&ocfs2_stack_lock); | |
169 | if (!ocfs2_stack_lookup(plugin->sp_name)) { | |
170 | plugin->sp_count = 0; | |
553b5eb9 | 171 | plugin->sp_max_proto = locking_max_version; |
286eaa95 JB |
172 | list_add(&plugin->sp_list, &ocfs2_stack_list); |
173 | printk(KERN_INFO "ocfs2: Registered cluster interface %s\n", | |
174 | plugin->sp_name); | |
175 | rc = 0; | |
176 | } else { | |
177 | printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n", | |
178 | plugin->sp_name); | |
179 | rc = -EEXIST; | |
180 | } | |
181 | spin_unlock(&ocfs2_stack_lock); | |
182 | ||
183 | return rc; | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register); | |
186 | ||
187 | void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin) | |
188 | { | |
189 | struct ocfs2_stack_plugin *p; | |
190 | ||
191 | spin_lock(&ocfs2_stack_lock); | |
192 | p = ocfs2_stack_lookup(plugin->sp_name); | |
193 | if (p) { | |
194 | BUG_ON(p != plugin); | |
195 | BUG_ON(plugin == active_stack); | |
196 | BUG_ON(plugin->sp_count != 0); | |
197 | list_del_init(&plugin->sp_list); | |
198 | printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n", | |
199 | plugin->sp_name); | |
200 | } else { | |
201 | printk(KERN_ERR "Stack \"%s\" is not registered\n", | |
202 | plugin->sp_name); | |
203 | } | |
204 | spin_unlock(&ocfs2_stack_lock); | |
205 | } | |
206 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister); | |
207 | ||
553b5eb9 | 208 | void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto) |
286eaa95 JB |
209 | { |
210 | struct ocfs2_stack_plugin *p; | |
211 | ||
286eaa95 | 212 | spin_lock(&ocfs2_stack_lock); |
553b5eb9 JB |
213 | if (memcmp(max_proto, &locking_max_version, |
214 | sizeof(struct ocfs2_protocol_version))) { | |
215 | BUG_ON(locking_max_version.pv_major != 0); | |
286eaa95 | 216 | |
553b5eb9 JB |
217 | locking_max_version = *max_proto; |
218 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { | |
219 | p->sp_max_proto = locking_max_version; | |
220 | } | |
286eaa95 | 221 | } |
286eaa95 JB |
222 | spin_unlock(&ocfs2_stack_lock); |
223 | } | |
553b5eb9 | 224 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version); |
7431cd7e | 225 | |
24ef1815 | 226 | |
cf4d8d75 | 227 | /* |
a796d286 JB |
228 | * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument |
229 | * for the ast and bast functions. They will pass the lksb to the ast | |
230 | * and bast. The caller can wrap the lksb with their own structure to | |
231 | * get more information. | |
cf4d8d75 | 232 | */ |
553aa7e4 JB |
233 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
234 | int mode, | |
c0e41338 | 235 | struct ocfs2_dlm_lksb *lksb, |
553aa7e4 JB |
236 | u32 flags, |
237 | void *name, | |
a796d286 | 238 | unsigned int namelen) |
553aa7e4 | 239 | { |
c0e41338 JB |
240 | if (!lksb->lksb_conn) |
241 | lksb->lksb_conn = conn; | |
242 | else | |
243 | BUG_ON(lksb->lksb_conn != conn); | |
286eaa95 | 244 | return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
a796d286 | 245 | name, namelen); |
24ef1815 | 246 | } |
286eaa95 | 247 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
24ef1815 | 248 | |
553aa7e4 | 249 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
c0e41338 | 250 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 251 | u32 flags) |
553aa7e4 | 252 | { |
c0e41338 | 253 | BUG_ON(lksb->lksb_conn == NULL); |
553aa7e4 | 254 | |
a796d286 | 255 | return active_stack->sp_ops->dlm_unlock(conn, lksb, flags); |
8f2c9c1b | 256 | } |
286eaa95 | 257 | EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
8f2c9c1b | 258 | |
c0e41338 | 259 | int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 260 | { |
286eaa95 | 261 | return active_stack->sp_ops->lock_status(lksb); |
553aa7e4 | 262 | } |
286eaa95 | 263 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
553aa7e4 | 264 | |
c0e41338 | 265 | int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
266 | { |
267 | return active_stack->sp_ops->lvb_valid(lksb); | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid); | |
270 | ||
c0e41338 | 271 | void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 272 | { |
286eaa95 | 273 | return active_stack->sp_ops->lock_lvb(lksb); |
cf0acdcd | 274 | } |
286eaa95 | 275 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
cf0acdcd | 276 | |
c0e41338 | 277 | void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
553aa7e4 | 278 | { |
286eaa95 | 279 | active_stack->sp_ops->dump_lksb(lksb); |
553aa7e4 | 280 | } |
286eaa95 | 281 | EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
553aa7e4 | 282 | |
53da4939 MF |
283 | int ocfs2_stack_supports_plocks(void) |
284 | { | |
009d3750 | 285 | return active_stack && active_stack->sp_ops->plock; |
53da4939 MF |
286 | } |
287 | EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks); | |
288 | ||
289 | /* | |
290 | * ocfs2_plock() can only be safely called if | |
291 | * ocfs2_stack_supports_plocks() returned true | |
292 | */ | |
293 | int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino, | |
294 | struct file *file, int cmd, struct file_lock *fl) | |
295 | { | |
296 | WARN_ON_ONCE(active_stack->sp_ops->plock == NULL); | |
297 | if (active_stack->sp_ops->plock) | |
298 | return active_stack->sp_ops->plock(conn, ino, file, cmd, fl); | |
299 | return -EOPNOTSUPP; | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(ocfs2_plock); | |
302 | ||
9c6c877c | 303 | int ocfs2_cluster_connect(const char *stack_name, |
c74a3bdd GR |
304 | const char *cluster_name, |
305 | int cluster_name_len, | |
9c6c877c | 306 | const char *group, |
4670c46d | 307 | int grouplen, |
553b5eb9 | 308 | struct ocfs2_locking_protocol *lproto, |
4670c46d JB |
309 | void (*recovery_handler)(int node_num, |
310 | void *recovery_data), | |
311 | void *recovery_data, | |
312 | struct ocfs2_cluster_connection **conn) | |
313 | { | |
314 | int rc = 0; | |
315 | struct ocfs2_cluster_connection *new_conn; | |
4670c46d JB |
316 | |
317 | BUG_ON(group == NULL); | |
318 | BUG_ON(conn == NULL); | |
319 | BUG_ON(recovery_handler == NULL); | |
320 | ||
321 | if (grouplen > GROUP_NAME_MAX) { | |
322 | rc = -EINVAL; | |
323 | goto out; | |
324 | } | |
325 | ||
553b5eb9 JB |
326 | if (memcmp(&lproto->lp_max_version, &locking_max_version, |
327 | sizeof(struct ocfs2_protocol_version))) { | |
328 | rc = -EINVAL; | |
329 | goto out; | |
330 | } | |
331 | ||
4670c46d JB |
332 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), |
333 | GFP_KERNEL); | |
334 | if (!new_conn) { | |
335 | rc = -ENOMEM; | |
336 | goto out; | |
337 | } | |
338 | ||
c74a3bdd | 339 | strlcpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1); |
4670c46d | 340 | new_conn->cc_namelen = grouplen; |
d9060742 SL |
341 | if (cluster_name_len) |
342 | strlcpy(new_conn->cc_cluster_name, cluster_name, | |
343 | CLUSTER_NAME_MAX + 1); | |
c74a3bdd | 344 | new_conn->cc_cluster_name_len = cluster_name_len; |
4670c46d JB |
345 | new_conn->cc_recovery_handler = recovery_handler; |
346 | new_conn->cc_recovery_data = recovery_data; | |
347 | ||
110946c8 | 348 | new_conn->cc_proto = lproto; |
4670c46d | 349 | /* Start the new connection at our maximum compatibility level */ |
286eaa95 JB |
350 | new_conn->cc_version = lproto->lp_max_version; |
351 | ||
352 | /* This will pin the stack driver if successful */ | |
9c6c877c | 353 | rc = ocfs2_stack_driver_get(stack_name); |
286eaa95 JB |
354 | if (rc) |
355 | goto out_free; | |
4670c46d | 356 | |
286eaa95 | 357 | rc = active_stack->sp_ops->connect(new_conn); |
553aa7e4 | 358 | if (rc) { |
286eaa95 | 359 | ocfs2_stack_driver_put(); |
4670c46d JB |
360 | goto out_free; |
361 | } | |
362 | ||
4670c46d JB |
363 | *conn = new_conn; |
364 | ||
365 | out_free: | |
553aa7e4 | 366 | if (rc) |
4670c46d | 367 | kfree(new_conn); |
4670c46d JB |
368 | |
369 | out: | |
370 | return rc; | |
371 | } | |
286eaa95 | 372 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
4670c46d | 373 | |
cbe0e331 JB |
374 | /* The caller will ensure all nodes have the same cluster stack */ |
375 | int ocfs2_cluster_connect_agnostic(const char *group, | |
376 | int grouplen, | |
377 | struct ocfs2_locking_protocol *lproto, | |
378 | void (*recovery_handler)(int node_num, | |
379 | void *recovery_data), | |
380 | void *recovery_data, | |
381 | struct ocfs2_cluster_connection **conn) | |
382 | { | |
383 | char *stack_name = NULL; | |
384 | ||
385 | if (cluster_stack_name[0]) | |
386 | stack_name = cluster_stack_name; | |
c74a3bdd GR |
387 | return ocfs2_cluster_connect(stack_name, NULL, 0, group, grouplen, |
388 | lproto, recovery_handler, recovery_data, | |
389 | conn); | |
cbe0e331 JB |
390 | } |
391 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic); | |
392 | ||
286eaa95 JB |
393 | /* If hangup_pending is 0, the stack driver will be dropped */ |
394 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, | |
395 | int hangup_pending) | |
553aa7e4 JB |
396 | { |
397 | int ret; | |
398 | ||
399 | BUG_ON(conn == NULL); | |
400 | ||
2c39450b | 401 | ret = active_stack->sp_ops->disconnect(conn); |
553aa7e4 JB |
402 | |
403 | /* XXX Should we free it anyway? */ | |
286eaa95 | 404 | if (!ret) { |
553aa7e4 | 405 | kfree(conn); |
286eaa95 JB |
406 | if (!hangup_pending) |
407 | ocfs2_stack_driver_put(); | |
408 | } | |
553aa7e4 JB |
409 | |
410 | return ret; | |
411 | } | |
286eaa95 | 412 | EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
553aa7e4 | 413 | |
9f9a99f4 JB |
414 | /* |
415 | * Leave the group for this filesystem. This is executed by a userspace | |
416 | * program (stored in ocfs2_hb_ctl_path). | |
417 | */ | |
418 | static void ocfs2_leave_group(const char *group) | |
419 | { | |
420 | int ret; | |
421 | char *argv[5], *envp[3]; | |
422 | ||
423 | argv[0] = ocfs2_hb_ctl_path; | |
424 | argv[1] = "-K"; | |
425 | argv[2] = "-u"; | |
426 | argv[3] = (char *)group; | |
427 | argv[4] = NULL; | |
428 | ||
429 | /* minimal command environment taken from cpu_run_sbin_hotplug */ | |
430 | envp[0] = "HOME=/"; | |
431 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
432 | envp[2] = NULL; | |
433 | ||
434 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
435 | if (ret < 0) { | |
436 | printk(KERN_ERR | |
437 | "ocfs2: Error %d running user helper " | |
438 | "\"%s %s %s %s\"\n", | |
439 | ret, argv[0], argv[1], argv[2], argv[3]); | |
440 | } | |
441 | } | |
442 | ||
443 | /* | |
444 | * Hangup is a required post-umount. ocfs2-tools software expects the | |
445 | * filesystem to call "ocfs2_hb_ctl" during unmount. This happens | |
446 | * regardless of whether the DLM got started, so we can't do it | |
447 | * in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does | |
448 | * the actual work. | |
449 | */ | |
6953b4c0 JB |
450 | void ocfs2_cluster_hangup(const char *group, int grouplen) |
451 | { | |
452 | BUG_ON(group == NULL); | |
453 | BUG_ON(group[grouplen] != '\0'); | |
454 | ||
9f9a99f4 JB |
455 | ocfs2_leave_group(group); |
456 | ||
286eaa95 JB |
457 | /* cluster_disconnect() was called with hangup_pending==1 */ |
458 | ocfs2_stack_driver_put(); | |
19fdb624 | 459 | } |
286eaa95 | 460 | EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
19fdb624 | 461 | |
3e834151 GR |
462 | int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn, |
463 | unsigned int *node) | |
553aa7e4 | 464 | { |
3e834151 | 465 | return active_stack->sp_ops->this_node(conn, node); |
553aa7e4 | 466 | } |
286eaa95 | 467 | EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
553aa7e4 | 468 | |
286eaa95 | 469 | |
74ae4e10 JB |
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); | |
553b5eb9 | 481 | if (locking_max_version.pv_major) |
74ae4e10 | 482 | ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", |
553b5eb9 JB |
483 | locking_max_version.pv_major, |
484 | locking_max_version.pv_minor); | |
74ae4e10 JB |
485 | spin_unlock(&ocfs2_stack_lock); |
486 | ||
487 | return ret; | |
488 | } | |
489 | ||
490 | static struct kobj_attribute ocfs2_attr_max_locking_protocol = | |
58f86cc8 | 491 | __ATTR(max_locking_protocol, S_IRUGO, |
74ae4e10 JB |
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) | |
24ef1815 | 497 | { |
74ae4e10 JB |
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 = | |
58f86cc8 | 523 | __ATTR(loaded_cluster_plugins, S_IRUGO, |
74ae4e10 JB |
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 = | |
58f86cc8 | 545 | __ATTR(active_cluster_plugin, S_IRUGO, |
74ae4e10 JB |
546 | ocfs2_active_cluster_plugin_show, NULL); |
547 | ||
9c6c877c JB |
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 = | |
58f86cc8 | 594 | __ATTR(cluster_stack, S_IRUGO | S_IWUSR, |
9c6c877c JB |
595 | ocfs2_cluster_stack_show, |
596 | ocfs2_cluster_stack_store); | |
597 | ||
765aabbb GR |
598 | |
599 | ||
600 | static ssize_t ocfs2_dlm_recover_show(struct kobject *kobj, | |
601 | struct kobj_attribute *attr, | |
602 | char *buf) | |
603 | { | |
604 | return snprintf(buf, PAGE_SIZE, "1\n"); | |
605 | } | |
606 | ||
607 | static struct kobj_attribute ocfs2_attr_dlm_recover_support = | |
608 | __ATTR(dlm_recover_callback_support, S_IRUGO, | |
609 | ocfs2_dlm_recover_show, NULL); | |
610 | ||
74ae4e10 JB |
611 | static struct attribute *ocfs2_attrs[] = { |
612 | &ocfs2_attr_max_locking_protocol.attr, | |
613 | &ocfs2_attr_loaded_cluster_plugins.attr, | |
614 | &ocfs2_attr_active_cluster_plugin.attr, | |
9c6c877c | 615 | &ocfs2_attr_cluster_stack.attr, |
765aabbb | 616 | &ocfs2_attr_dlm_recover_support.attr, |
74ae4e10 JB |
617 | NULL, |
618 | }; | |
619 | ||
b74271e4 | 620 | static const struct attribute_group ocfs2_attr_group = { |
74ae4e10 JB |
621 | .attrs = ocfs2_attrs, |
622 | }; | |
623 | ||
9dde5e4f GH |
624 | struct kset *ocfs2_kset; |
625 | EXPORT_SYMBOL_GPL(ocfs2_kset); | |
74ae4e10 JB |
626 | |
627 | static void ocfs2_sysfs_exit(void) | |
628 | { | |
629 | kset_unregister(ocfs2_kset); | |
630 | } | |
631 | ||
632 | static int ocfs2_sysfs_init(void) | |
633 | { | |
634 | int ret; | |
635 | ||
636 | ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); | |
637 | if (!ocfs2_kset) | |
638 | return -ENOMEM; | |
639 | ||
640 | ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); | |
641 | if (ret) | |
642 | goto error; | |
643 | ||
286eaa95 | 644 | return 0; |
74ae4e10 JB |
645 | |
646 | error: | |
647 | kset_unregister(ocfs2_kset); | |
648 | return ret; | |
649 | } | |
650 | ||
3878f110 JB |
651 | /* |
652 | * Sysctl bits | |
653 | * | |
654 | * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't | |
655 | * make as much sense in a multiple cluster stack world, but it's safer | |
656 | * and easier to preserve the name. | |
657 | */ | |
658 | ||
659 | #define FS_OCFS2_NM 1 | |
660 | ||
d00d2f8a | 661 | static struct ctl_table ocfs2_nm_table[] = { |
3878f110 | 662 | { |
3878f110 JB |
663 | .procname = "hb_ctl_path", |
664 | .data = ocfs2_hb_ctl_path, | |
665 | .maxlen = OCFS2_MAX_HB_CTL_PATH, | |
666 | .mode = 0644, | |
6d456111 | 667 | .proc_handler = proc_dostring, |
3878f110 | 668 | }, |
ab09203e | 669 | { } |
3878f110 JB |
670 | }; |
671 | ||
d00d2f8a | 672 | static struct ctl_table ocfs2_mod_table[] = { |
3878f110 | 673 | { |
3878f110 JB |
674 | .procname = "nm", |
675 | .data = NULL, | |
676 | .maxlen = 0, | |
677 | .mode = 0555, | |
678 | .child = ocfs2_nm_table | |
679 | }, | |
ab09203e | 680 | { } |
3878f110 JB |
681 | }; |
682 | ||
d00d2f8a | 683 | static struct ctl_table ocfs2_kern_table[] = { |
3878f110 | 684 | { |
3878f110 JB |
685 | .procname = "ocfs2", |
686 | .data = NULL, | |
687 | .maxlen = 0, | |
688 | .mode = 0555, | |
689 | .child = ocfs2_mod_table | |
690 | }, | |
ab09203e | 691 | { } |
3878f110 JB |
692 | }; |
693 | ||
d00d2f8a | 694 | static struct ctl_table ocfs2_root_table[] = { |
3878f110 | 695 | { |
3878f110 JB |
696 | .procname = "fs", |
697 | .data = NULL, | |
698 | .maxlen = 0, | |
699 | .mode = 0555, | |
700 | .child = ocfs2_kern_table | |
701 | }, | |
ab09203e | 702 | { } |
3878f110 JB |
703 | }; |
704 | ||
1a5c4e2a | 705 | static struct ctl_table_header *ocfs2_table_header; |
3878f110 | 706 | |
3878f110 JB |
707 | |
708 | /* | |
709 | * Initialization | |
710 | */ | |
711 | ||
74ae4e10 JB |
712 | static int __init ocfs2_stack_glue_init(void) |
713 | { | |
9c6c877c JB |
714 | strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
715 | ||
3878f110 JB |
716 | ocfs2_table_header = register_sysctl_table(ocfs2_root_table); |
717 | if (!ocfs2_table_header) { | |
718 | printk(KERN_ERR | |
719 | "ocfs2 stack glue: unable to register sysctl\n"); | |
720 | return -ENOMEM; /* or something. */ | |
721 | } | |
722 | ||
74ae4e10 | 723 | return ocfs2_sysfs_init(); |
286eaa95 | 724 | } |
24ef1815 | 725 | |
286eaa95 JB |
726 | static void __exit ocfs2_stack_glue_exit(void) |
727 | { | |
553b5eb9 JB |
728 | memset(&locking_max_version, 0, |
729 | sizeof(struct ocfs2_protocol_version)); | |
74ae4e10 | 730 | ocfs2_sysfs_exit(); |
3878f110 JB |
731 | if (ocfs2_table_header) |
732 | unregister_sysctl_table(ocfs2_table_header); | |
24ef1815 JB |
733 | } |
734 | ||
286eaa95 JB |
735 | MODULE_AUTHOR("Oracle"); |
736 | MODULE_DESCRIPTION("ocfs2 cluter stack glue layer"); | |
737 | MODULE_LICENSE("GPL"); | |
738 | module_init(ocfs2_stack_glue_init); | |
739 | module_exit(ocfs2_stack_glue_exit); |