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8adf0536 JB |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * stack_user.c | |
5 | * | |
6 | * Code which interfaces ocfs2 with fs/dlm and a userspace stack. | |
7 | * | |
8 | * Copyright (C) 2007 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation, version 2. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
6427a727 JB |
21 | #include <linux/fs.h> |
22 | #include <linux/miscdevice.h> | |
23 | #include <linux/mutex.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
6427a727 | 25 | #include <linux/reboot.h> |
c994c2eb | 26 | #include <linux/sched.h> |
462c7e6a | 27 | #include <asm/uaccess.h> |
8adf0536 JB |
28 | |
29 | #include "stackglue.h" | |
30 | ||
53da4939 | 31 | #include <linux/dlm_plock.h> |
8adf0536 | 32 | |
6427a727 JB |
33 | /* |
34 | * The control protocol starts with a handshake. Until the handshake | |
35 | * is complete, the control device will fail all write(2)s. | |
36 | * | |
37 | * The handshake is simple. First, the client reads until EOF. Each line | |
38 | * of output is a supported protocol tag. All protocol tags are a single | |
39 | * character followed by a two hex digit version number. Currently the | |
40 | * only things supported is T01, for "Text-base version 0x01". Next, the | |
de870ef0 JB |
41 | * client writes the version they would like to use, including the newline. |
42 | * Thus, the protocol tag is 'T01\n'. If the version tag written is | |
43 | * unknown, -EINVAL is returned. Once the negotiation is complete, the | |
44 | * client can start sending messages. | |
45 | * | |
d4b95eef | 46 | * The T01 protocol has three messages. First is the "SETN" message. |
3cfd4ab6 JB |
47 | * It has the following syntax: |
48 | * | |
49 | * SETN<space><8-char-hex-nodenum><newline> | |
50 | * | |
51 | * This is 14 characters. | |
52 | * | |
53 | * The "SETN" message must be the first message following the protocol. | |
54 | * It tells ocfs2_control the local node number. | |
55 | * | |
d4b95eef JB |
56 | * Next comes the "SETV" message. It has the following syntax: |
57 | * | |
58 | * SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> | |
59 | * | |
60 | * This is 11 characters. | |
61 | * | |
62 | * The "SETV" message sets the filesystem locking protocol version as | |
63 | * negotiated by the client. The client negotiates based on the maximum | |
64 | * version advertised in /sys/fs/ocfs2/max_locking_protocol. The major | |
65 | * number from the "SETV" message must match | |
e603cfb0 JB |
66 | * ocfs2_user_plugin.sp_max_proto.pv_major, and the minor number |
67 | * must be less than or equal to ...sp_max_version.pv_minor. | |
d4b95eef JB |
68 | * |
69 | * Once this information has been set, mounts will be allowed. From this | |
70 | * point on, the "DOWN" message can be sent for node down notification. | |
71 | * It has the following syntax: | |
de870ef0 JB |
72 | * |
73 | * DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> | |
74 | * | |
75 | * eg: | |
76 | * | |
77 | * DOWN 632A924FDD844190BDA93C0DF6B94899 00000001\n | |
78 | * | |
79 | * This is 47 characters. | |
6427a727 JB |
80 | */ |
81 | ||
462c7e6a JB |
82 | /* |
83 | * Whether or not the client has done the handshake. | |
84 | * For now, we have just one protocol version. | |
85 | */ | |
86 | #define OCFS2_CONTROL_PROTO "T01\n" | |
87 | #define OCFS2_CONTROL_PROTO_LEN 4 | |
3cfd4ab6 JB |
88 | |
89 | /* Handshake states */ | |
462c7e6a JB |
90 | #define OCFS2_CONTROL_HANDSHAKE_INVALID (0) |
91 | #define OCFS2_CONTROL_HANDSHAKE_READ (1) | |
3cfd4ab6 JB |
92 | #define OCFS2_CONTROL_HANDSHAKE_PROTOCOL (2) |
93 | #define OCFS2_CONTROL_HANDSHAKE_VALID (3) | |
94 | ||
95 | /* Messages */ | |
96 | #define OCFS2_CONTROL_MESSAGE_OP_LEN 4 | |
97 | #define OCFS2_CONTROL_MESSAGE_SETNODE_OP "SETN" | |
98 | #define OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN 14 | |
d4b95eef JB |
99 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_OP "SETV" |
100 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN 11 | |
3cfd4ab6 | 101 | #define OCFS2_CONTROL_MESSAGE_DOWN_OP "DOWN" |
de870ef0 JB |
102 | #define OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN 47 |
103 | #define OCFS2_TEXT_UUID_LEN 32 | |
d4b95eef | 104 | #define OCFS2_CONTROL_MESSAGE_VERNUM_LEN 2 |
de870ef0 | 105 | #define OCFS2_CONTROL_MESSAGE_NODENUM_LEN 8 |
41503630 | 106 | #define VERSION_LOCK "version_lock" |
462c7e6a | 107 | |
3e834151 GR |
108 | enum ocfs2_connection_type { |
109 | WITH_CONTROLD, | |
110 | NO_CONTROLD | |
111 | }; | |
112 | ||
6427a727 JB |
113 | /* |
114 | * ocfs2_live_connection is refcounted because the filesystem and | |
115 | * miscdevice sides can detach in different order. Let's just be safe. | |
116 | */ | |
117 | struct ocfs2_live_connection { | |
118 | struct list_head oc_list; | |
119 | struct ocfs2_cluster_connection *oc_conn; | |
3e834151 | 120 | enum ocfs2_connection_type oc_type; |
66e188fc GR |
121 | atomic_t oc_this_node; |
122 | int oc_our_slot; | |
41503630 GR |
123 | struct dlm_lksb oc_version_lksb; |
124 | char oc_lvb[DLM_LVB_LEN]; | |
125 | struct completion oc_sync_wait; | |
c994c2eb | 126 | wait_queue_head_t oc_wait; |
6427a727 JB |
127 | }; |
128 | ||
462c7e6a JB |
129 | struct ocfs2_control_private { |
130 | struct list_head op_list; | |
131 | int op_state; | |
3cfd4ab6 | 132 | int op_this_node; |
d4b95eef | 133 | struct ocfs2_protocol_version op_proto; |
3cfd4ab6 JB |
134 | }; |
135 | ||
136 | /* SETN<space><8-char-hex-nodenum><newline> */ | |
137 | struct ocfs2_control_message_setn { | |
138 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
139 | char space; | |
140 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; | |
141 | char newline; | |
142 | }; | |
143 | ||
d4b95eef JB |
144 | /* SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> */ |
145 | struct ocfs2_control_message_setv { | |
146 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
147 | char space1; | |
148 | char major[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; | |
149 | char space2; | |
150 | char minor[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; | |
151 | char newline; | |
152 | }; | |
153 | ||
3cfd4ab6 JB |
154 | /* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */ |
155 | struct ocfs2_control_message_down { | |
156 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
157 | char space1; | |
158 | char uuid[OCFS2_TEXT_UUID_LEN]; | |
159 | char space2; | |
160 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; | |
161 | char newline; | |
162 | }; | |
163 | ||
164 | union ocfs2_control_message { | |
165 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
166 | struct ocfs2_control_message_setn u_setn; | |
d4b95eef | 167 | struct ocfs2_control_message_setv u_setv; |
3cfd4ab6 | 168 | struct ocfs2_control_message_down u_down; |
462c7e6a JB |
169 | }; |
170 | ||
a12630b1 | 171 | static struct ocfs2_stack_plugin ocfs2_user_plugin; |
cf4d8d75 | 172 | |
6427a727 | 173 | static atomic_t ocfs2_control_opened; |
3cfd4ab6 | 174 | static int ocfs2_control_this_node = -1; |
d4b95eef | 175 | static struct ocfs2_protocol_version running_proto; |
6427a727 JB |
176 | |
177 | static LIST_HEAD(ocfs2_live_connection_list); | |
462c7e6a | 178 | static LIST_HEAD(ocfs2_control_private_list); |
6427a727 JB |
179 | static DEFINE_MUTEX(ocfs2_control_lock); |
180 | ||
462c7e6a JB |
181 | static inline void ocfs2_control_set_handshake_state(struct file *file, |
182 | int state) | |
183 | { | |
184 | struct ocfs2_control_private *p = file->private_data; | |
185 | p->op_state = state; | |
186 | } | |
187 | ||
188 | static inline int ocfs2_control_get_handshake_state(struct file *file) | |
189 | { | |
190 | struct ocfs2_control_private *p = file->private_data; | |
191 | return p->op_state; | |
192 | } | |
193 | ||
6427a727 JB |
194 | static struct ocfs2_live_connection *ocfs2_connection_find(const char *name) |
195 | { | |
196 | size_t len = strlen(name); | |
197 | struct ocfs2_live_connection *c; | |
198 | ||
199 | BUG_ON(!mutex_is_locked(&ocfs2_control_lock)); | |
200 | ||
201 | list_for_each_entry(c, &ocfs2_live_connection_list, oc_list) { | |
202 | if ((c->oc_conn->cc_namelen == len) && | |
203 | !strncmp(c->oc_conn->cc_name, name, len)) | |
204 | return c; | |
205 | } | |
206 | ||
226291aa | 207 | return NULL; |
6427a727 JB |
208 | } |
209 | ||
210 | /* | |
211 | * ocfs2_live_connection structures are created underneath the ocfs2 | |
212 | * mount path. Since the VFS prevents multiple calls to | |
213 | * fill_super(), we can't get dupes here. | |
214 | */ | |
24aa3386 GR |
215 | static int ocfs2_live_connection_attach(struct ocfs2_cluster_connection *conn, |
216 | struct ocfs2_live_connection *c) | |
6427a727 JB |
217 | { |
218 | int rc = 0; | |
6427a727 JB |
219 | |
220 | mutex_lock(&ocfs2_control_lock); | |
221 | c->oc_conn = conn; | |
222 | ||
c994c2eb | 223 | if ((c->oc_type == NO_CONTROLD) || atomic_read(&ocfs2_control_opened)) |
6427a727 JB |
224 | list_add(&c->oc_list, &ocfs2_live_connection_list); |
225 | else { | |
226 | printk(KERN_ERR | |
227 | "ocfs2: Userspace control daemon is not present\n"); | |
228 | rc = -ESRCH; | |
229 | } | |
230 | ||
231 | mutex_unlock(&ocfs2_control_lock); | |
6427a727 JB |
232 | return rc; |
233 | } | |
234 | ||
235 | /* | |
236 | * This function disconnects the cluster connection from ocfs2_control. | |
237 | * Afterwards, userspace can't affect the cluster connection. | |
238 | */ | |
239 | static void ocfs2_live_connection_drop(struct ocfs2_live_connection *c) | |
240 | { | |
241 | mutex_lock(&ocfs2_control_lock); | |
242 | list_del_init(&c->oc_list); | |
243 | c->oc_conn = NULL; | |
244 | mutex_unlock(&ocfs2_control_lock); | |
245 | ||
246 | kfree(c); | |
247 | } | |
248 | ||
3cfd4ab6 JB |
249 | static int ocfs2_control_cfu(void *target, size_t target_len, |
250 | const char __user *buf, size_t count) | |
462c7e6a JB |
251 | { |
252 | /* The T01 expects write(2) calls to have exactly one command */ | |
3cfd4ab6 JB |
253 | if ((count != target_len) || |
254 | (count > sizeof(union ocfs2_control_message))) | |
462c7e6a JB |
255 | return -EINVAL; |
256 | ||
257 | if (copy_from_user(target, buf, target_len)) | |
258 | return -EFAULT; | |
259 | ||
3cfd4ab6 | 260 | return 0; |
462c7e6a JB |
261 | } |
262 | ||
3cfd4ab6 JB |
263 | static ssize_t ocfs2_control_validate_protocol(struct file *file, |
264 | const char __user *buf, | |
265 | size_t count) | |
462c7e6a JB |
266 | { |
267 | ssize_t ret; | |
268 | char kbuf[OCFS2_CONTROL_PROTO_LEN]; | |
269 | ||
270 | ret = ocfs2_control_cfu(kbuf, OCFS2_CONTROL_PROTO_LEN, | |
271 | buf, count); | |
3cfd4ab6 | 272 | if (ret) |
462c7e6a JB |
273 | return ret; |
274 | ||
275 | if (strncmp(kbuf, OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN)) | |
276 | return -EINVAL; | |
277 | ||
462c7e6a | 278 | ocfs2_control_set_handshake_state(file, |
3cfd4ab6 | 279 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
462c7e6a JB |
280 | |
281 | return count; | |
282 | } | |
283 | ||
de870ef0 JB |
284 | static void ocfs2_control_send_down(const char *uuid, |
285 | int nodenum) | |
286 | { | |
287 | struct ocfs2_live_connection *c; | |
288 | ||
289 | mutex_lock(&ocfs2_control_lock); | |
290 | ||
291 | c = ocfs2_connection_find(uuid); | |
292 | if (c) { | |
293 | BUG_ON(c->oc_conn == NULL); | |
294 | c->oc_conn->cc_recovery_handler(nodenum, | |
295 | c->oc_conn->cc_recovery_data); | |
296 | } | |
297 | ||
298 | mutex_unlock(&ocfs2_control_lock); | |
299 | } | |
300 | ||
3cfd4ab6 JB |
301 | /* |
302 | * Called whenever configuration elements are sent to /dev/ocfs2_control. | |
303 | * If all configuration elements are present, try to set the global | |
d4b95eef JB |
304 | * values. If there is a problem, return an error. Skip any missing |
305 | * elements, and only bump ocfs2_control_opened when we have all elements | |
306 | * and are successful. | |
3cfd4ab6 JB |
307 | */ |
308 | static int ocfs2_control_install_private(struct file *file) | |
309 | { | |
310 | int rc = 0; | |
311 | int set_p = 1; | |
312 | struct ocfs2_control_private *p = file->private_data; | |
de870ef0 | 313 | |
3cfd4ab6 JB |
314 | BUG_ON(p->op_state != OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
315 | ||
d4b95eef JB |
316 | mutex_lock(&ocfs2_control_lock); |
317 | ||
318 | if (p->op_this_node < 0) { | |
3cfd4ab6 | 319 | set_p = 0; |
d4b95eef JB |
320 | } else if ((ocfs2_control_this_node >= 0) && |
321 | (ocfs2_control_this_node != p->op_this_node)) { | |
322 | rc = -EINVAL; | |
323 | goto out_unlock; | |
324 | } | |
3cfd4ab6 | 325 | |
d4b95eef JB |
326 | if (!p->op_proto.pv_major) { |
327 | set_p = 0; | |
328 | } else if (!list_empty(&ocfs2_live_connection_list) && | |
329 | ((running_proto.pv_major != p->op_proto.pv_major) || | |
330 | (running_proto.pv_minor != p->op_proto.pv_minor))) { | |
3cfd4ab6 | 331 | rc = -EINVAL; |
d4b95eef JB |
332 | goto out_unlock; |
333 | } | |
334 | ||
335 | if (set_p) { | |
336 | ocfs2_control_this_node = p->op_this_node; | |
337 | running_proto.pv_major = p->op_proto.pv_major; | |
338 | running_proto.pv_minor = p->op_proto.pv_minor; | |
339 | } | |
340 | ||
341 | out_unlock: | |
3cfd4ab6 JB |
342 | mutex_unlock(&ocfs2_control_lock); |
343 | ||
344 | if (!rc && set_p) { | |
345 | /* We set the global values successfully */ | |
346 | atomic_inc(&ocfs2_control_opened); | |
347 | ocfs2_control_set_handshake_state(file, | |
348 | OCFS2_CONTROL_HANDSHAKE_VALID); | |
349 | } | |
350 | ||
351 | return rc; | |
352 | } | |
353 | ||
cf4d8d75 DT |
354 | static int ocfs2_control_get_this_node(void) |
355 | { | |
356 | int rc; | |
357 | ||
358 | mutex_lock(&ocfs2_control_lock); | |
359 | if (ocfs2_control_this_node < 0) | |
360 | rc = -EINVAL; | |
361 | else | |
362 | rc = ocfs2_control_this_node; | |
363 | mutex_unlock(&ocfs2_control_lock); | |
364 | ||
365 | return rc; | |
366 | } | |
367 | ||
3cfd4ab6 JB |
368 | static int ocfs2_control_do_setnode_msg(struct file *file, |
369 | struct ocfs2_control_message_setn *msg) | |
de870ef0 | 370 | { |
de870ef0 | 371 | long nodenum; |
3cfd4ab6 JB |
372 | char *ptr = NULL; |
373 | struct ocfs2_control_private *p = file->private_data; | |
de870ef0 | 374 | |
3cfd4ab6 JB |
375 | if (ocfs2_control_get_handshake_state(file) != |
376 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) | |
377 | return -EINVAL; | |
de870ef0 | 378 | |
3cfd4ab6 JB |
379 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, |
380 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
381 | return -EINVAL; | |
382 | ||
383 | if ((msg->space != ' ') || (msg->newline != '\n')) | |
384 | return -EINVAL; | |
385 | msg->space = msg->newline = '\0'; | |
386 | ||
387 | nodenum = simple_strtol(msg->nodestr, &ptr, 16); | |
388 | if (!ptr || *ptr) | |
389 | return -EINVAL; | |
390 | ||
391 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || | |
392 | (nodenum > INT_MAX) || (nodenum < 0)) | |
393 | return -ERANGE; | |
394 | p->op_this_node = nodenum; | |
395 | ||
396 | return ocfs2_control_install_private(file); | |
397 | } | |
398 | ||
d4b95eef JB |
399 | static int ocfs2_control_do_setversion_msg(struct file *file, |
400 | struct ocfs2_control_message_setv *msg) | |
401 | { | |
402 | long major, minor; | |
403 | char *ptr = NULL; | |
404 | struct ocfs2_control_private *p = file->private_data; | |
405 | struct ocfs2_protocol_version *max = | |
e603cfb0 | 406 | &ocfs2_user_plugin.sp_max_proto; |
d4b95eef JB |
407 | |
408 | if (ocfs2_control_get_handshake_state(file) != | |
409 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) | |
410 | return -EINVAL; | |
411 | ||
412 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, | |
413 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
414 | return -EINVAL; | |
415 | ||
416 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || | |
417 | (msg->newline != '\n')) | |
418 | return -EINVAL; | |
419 | msg->space1 = msg->space2 = msg->newline = '\0'; | |
420 | ||
421 | major = simple_strtol(msg->major, &ptr, 16); | |
422 | if (!ptr || *ptr) | |
423 | return -EINVAL; | |
424 | minor = simple_strtol(msg->minor, &ptr, 16); | |
425 | if (!ptr || *ptr) | |
426 | return -EINVAL; | |
427 | ||
428 | /* | |
429 | * The major must be between 1 and 255, inclusive. The minor | |
430 | * must be between 0 and 255, inclusive. The version passed in | |
431 | * must be within the maximum version supported by the filesystem. | |
432 | */ | |
433 | if ((major == LONG_MIN) || (major == LONG_MAX) || | |
434 | (major > (u8)-1) || (major < 1)) | |
435 | return -ERANGE; | |
436 | if ((minor == LONG_MIN) || (minor == LONG_MAX) || | |
437 | (minor > (u8)-1) || (minor < 0)) | |
438 | return -ERANGE; | |
439 | if ((major != max->pv_major) || | |
440 | (minor > max->pv_minor)) | |
441 | return -EINVAL; | |
442 | ||
443 | p->op_proto.pv_major = major; | |
444 | p->op_proto.pv_minor = minor; | |
445 | ||
446 | return ocfs2_control_install_private(file); | |
447 | } | |
448 | ||
3cfd4ab6 JB |
449 | static int ocfs2_control_do_down_msg(struct file *file, |
450 | struct ocfs2_control_message_down *msg) | |
451 | { | |
452 | long nodenum; | |
453 | char *p = NULL; | |
454 | ||
455 | if (ocfs2_control_get_handshake_state(file) != | |
456 | OCFS2_CONTROL_HANDSHAKE_VALID) | |
457 | return -EINVAL; | |
de870ef0 | 458 | |
3cfd4ab6 JB |
459 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, |
460 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
de870ef0 JB |
461 | return -EINVAL; |
462 | ||
3cfd4ab6 JB |
463 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || |
464 | (msg->newline != '\n')) | |
de870ef0 | 465 | return -EINVAL; |
3cfd4ab6 | 466 | msg->space1 = msg->space2 = msg->newline = '\0'; |
de870ef0 | 467 | |
3cfd4ab6 | 468 | nodenum = simple_strtol(msg->nodestr, &p, 16); |
de870ef0 JB |
469 | if (!p || *p) |
470 | return -EINVAL; | |
471 | ||
472 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || | |
473 | (nodenum > INT_MAX) || (nodenum < 0)) | |
474 | return -ERANGE; | |
475 | ||
3cfd4ab6 | 476 | ocfs2_control_send_down(msg->uuid, nodenum); |
de870ef0 | 477 | |
3cfd4ab6 JB |
478 | return 0; |
479 | } | |
480 | ||
481 | static ssize_t ocfs2_control_message(struct file *file, | |
482 | const char __user *buf, | |
483 | size_t count) | |
484 | { | |
485 | ssize_t ret; | |
486 | union ocfs2_control_message msg; | |
487 | ||
488 | /* Try to catch padding issues */ | |
489 | WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) != | |
490 | (sizeof(msg.u_down.tag) + sizeof(msg.u_down.space1))); | |
491 | ||
492 | memset(&msg, 0, sizeof(union ocfs2_control_message)); | |
493 | ret = ocfs2_control_cfu(&msg, count, buf, count); | |
494 | if (ret) | |
495 | goto out; | |
496 | ||
497 | if ((count == OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN) && | |
498 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, | |
499 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
500 | ret = ocfs2_control_do_setnode_msg(file, &msg.u_setn); | |
d4b95eef JB |
501 | else if ((count == OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN) && |
502 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, | |
503 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
504 | ret = ocfs2_control_do_setversion_msg(file, &msg.u_setv); | |
3cfd4ab6 JB |
505 | else if ((count == OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN) && |
506 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, | |
507 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
508 | ret = ocfs2_control_do_down_msg(file, &msg.u_down); | |
509 | else | |
510 | ret = -EINVAL; | |
511 | ||
512 | out: | |
513 | return ret ? ret : count; | |
de870ef0 | 514 | } |
6427a727 JB |
515 | |
516 | static ssize_t ocfs2_control_write(struct file *file, | |
517 | const char __user *buf, | |
518 | size_t count, | |
519 | loff_t *ppos) | |
8adf0536 | 520 | { |
462c7e6a JB |
521 | ssize_t ret; |
522 | ||
523 | switch (ocfs2_control_get_handshake_state(file)) { | |
524 | case OCFS2_CONTROL_HANDSHAKE_INVALID: | |
525 | ret = -EINVAL; | |
526 | break; | |
527 | ||
528 | case OCFS2_CONTROL_HANDSHAKE_READ: | |
3cfd4ab6 JB |
529 | ret = ocfs2_control_validate_protocol(file, buf, |
530 | count); | |
462c7e6a JB |
531 | break; |
532 | ||
3cfd4ab6 | 533 | case OCFS2_CONTROL_HANDSHAKE_PROTOCOL: |
462c7e6a | 534 | case OCFS2_CONTROL_HANDSHAKE_VALID: |
de870ef0 | 535 | ret = ocfs2_control_message(file, buf, count); |
462c7e6a JB |
536 | break; |
537 | ||
538 | default: | |
539 | BUG(); | |
540 | ret = -EIO; | |
541 | break; | |
542 | } | |
543 | ||
544 | return ret; | |
8adf0536 JB |
545 | } |
546 | ||
462c7e6a JB |
547 | /* |
548 | * This is a naive version. If we ever have a new protocol, we'll expand | |
549 | * it. Probably using seq_file. | |
550 | */ | |
6427a727 JB |
551 | static ssize_t ocfs2_control_read(struct file *file, |
552 | char __user *buf, | |
553 | size_t count, | |
554 | loff_t *ppos) | |
555 | { | |
7600c72b | 556 | ssize_t ret; |
462c7e6a | 557 | |
7600c72b AM |
558 | ret = simple_read_from_buffer(buf, count, ppos, |
559 | OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN); | |
462c7e6a JB |
560 | |
561 | /* Have we read the whole protocol list? */ | |
7600c72b | 562 | if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN) |
462c7e6a JB |
563 | ocfs2_control_set_handshake_state(file, |
564 | OCFS2_CONTROL_HANDSHAKE_READ); | |
565 | ||
7600c72b | 566 | return ret; |
6427a727 JB |
567 | } |
568 | ||
569 | static int ocfs2_control_release(struct inode *inode, struct file *file) | |
570 | { | |
462c7e6a JB |
571 | struct ocfs2_control_private *p = file->private_data; |
572 | ||
573 | mutex_lock(&ocfs2_control_lock); | |
574 | ||
575 | if (ocfs2_control_get_handshake_state(file) != | |
576 | OCFS2_CONTROL_HANDSHAKE_VALID) | |
577 | goto out; | |
578 | ||
6427a727 | 579 | if (atomic_dec_and_test(&ocfs2_control_opened)) { |
6427a727 JB |
580 | if (!list_empty(&ocfs2_live_connection_list)) { |
581 | /* XXX: Do bad things! */ | |
582 | printk(KERN_ERR | |
583 | "ocfs2: Unexpected release of ocfs2_control!\n" | |
584 | " Loss of cluster connection requires " | |
585 | "an emergency restart!\n"); | |
586 | emergency_restart(); | |
587 | } | |
d4b95eef JB |
588 | /* |
589 | * Last valid close clears the node number and resets | |
590 | * the locking protocol version | |
591 | */ | |
3cfd4ab6 | 592 | ocfs2_control_this_node = -1; |
d4b95eef | 593 | running_proto.pv_major = 0; |
98acbf63 | 594 | running_proto.pv_minor = 0; |
6427a727 JB |
595 | } |
596 | ||
462c7e6a JB |
597 | out: |
598 | list_del_init(&p->op_list); | |
599 | file->private_data = NULL; | |
600 | ||
601 | mutex_unlock(&ocfs2_control_lock); | |
602 | ||
603 | kfree(p); | |
604 | ||
6427a727 JB |
605 | return 0; |
606 | } | |
607 | ||
608 | static int ocfs2_control_open(struct inode *inode, struct file *file) | |
609 | { | |
462c7e6a JB |
610 | struct ocfs2_control_private *p; |
611 | ||
612 | p = kzalloc(sizeof(struct ocfs2_control_private), GFP_KERNEL); | |
613 | if (!p) | |
614 | return -ENOMEM; | |
3cfd4ab6 | 615 | p->op_this_node = -1; |
462c7e6a JB |
616 | |
617 | mutex_lock(&ocfs2_control_lock); | |
618 | file->private_data = p; | |
619 | list_add(&p->op_list, &ocfs2_control_private_list); | |
620 | mutex_unlock(&ocfs2_control_lock); | |
6427a727 JB |
621 | |
622 | return 0; | |
623 | } | |
624 | ||
625 | static const struct file_operations ocfs2_control_fops = { | |
626 | .open = ocfs2_control_open, | |
627 | .release = ocfs2_control_release, | |
628 | .read = ocfs2_control_read, | |
629 | .write = ocfs2_control_write, | |
630 | .owner = THIS_MODULE, | |
6038f373 | 631 | .llseek = default_llseek, |
6427a727 JB |
632 | }; |
633 | ||
4d8755b5 | 634 | static struct miscdevice ocfs2_control_device = { |
6427a727 JB |
635 | .minor = MISC_DYNAMIC_MINOR, |
636 | .name = "ocfs2_control", | |
637 | .fops = &ocfs2_control_fops, | |
638 | }; | |
639 | ||
640 | static int ocfs2_control_init(void) | |
641 | { | |
642 | int rc; | |
643 | ||
644 | atomic_set(&ocfs2_control_opened, 0); | |
645 | ||
646 | rc = misc_register(&ocfs2_control_device); | |
647 | if (rc) | |
648 | printk(KERN_ERR | |
649 | "ocfs2: Unable to register ocfs2_control device " | |
650 | "(errno %d)\n", | |
651 | -rc); | |
652 | ||
653 | return rc; | |
654 | } | |
655 | ||
656 | static void ocfs2_control_exit(void) | |
657 | { | |
f368ed60 | 658 | misc_deregister(&ocfs2_control_device); |
6427a727 JB |
659 | } |
660 | ||
cf4d8d75 DT |
661 | static void fsdlm_lock_ast_wrapper(void *astarg) |
662 | { | |
c0e41338 | 663 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 664 | int status = lksb->lksb_fsdlm.sb_status; |
cf4d8d75 | 665 | |
cf4d8d75 DT |
666 | /* |
667 | * For now we're punting on the issue of other non-standard errors | |
668 | * where we can't tell if the unlock_ast or lock_ast should be called. | |
669 | * The main "other error" that's possible is EINVAL which means the | |
670 | * function was called with invalid args, which shouldn't be possible | |
671 | * since the caller here is under our control. Other non-standard | |
672 | * errors probably fall into the same category, or otherwise are fatal | |
673 | * which means we can't carry on anyway. | |
674 | */ | |
675 | ||
676 | if (status == -DLM_EUNLOCK || status == -DLM_ECANCEL) | |
110946c8 | 677 | lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, 0); |
cf4d8d75 | 678 | else |
110946c8 | 679 | lksb->lksb_conn->cc_proto->lp_lock_ast(lksb); |
cf4d8d75 DT |
680 | } |
681 | ||
682 | static void fsdlm_blocking_ast_wrapper(void *astarg, int level) | |
683 | { | |
c0e41338 | 684 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 685 | |
110946c8 | 686 | lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level); |
cf4d8d75 DT |
687 | } |
688 | ||
689 | static int user_dlm_lock(struct ocfs2_cluster_connection *conn, | |
690 | int mode, | |
c0e41338 | 691 | struct ocfs2_dlm_lksb *lksb, |
cf4d8d75 DT |
692 | u32 flags, |
693 | void *name, | |
a796d286 | 694 | unsigned int namelen) |
cf4d8d75 DT |
695 | { |
696 | int ret; | |
697 | ||
698 | if (!lksb->lksb_fsdlm.sb_lvbptr) | |
699 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + | |
700 | sizeof(struct dlm_lksb); | |
701 | ||
702 | ret = dlm_lock(conn->cc_lockspace, mode, &lksb->lksb_fsdlm, | |
703 | flags|DLM_LKF_NODLCKWT, name, namelen, 0, | |
a796d286 | 704 | fsdlm_lock_ast_wrapper, lksb, |
cf4d8d75 DT |
705 | fsdlm_blocking_ast_wrapper); |
706 | return ret; | |
707 | } | |
708 | ||
709 | static int user_dlm_unlock(struct ocfs2_cluster_connection *conn, | |
c0e41338 | 710 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 711 | u32 flags) |
cf4d8d75 DT |
712 | { |
713 | int ret; | |
714 | ||
715 | ret = dlm_unlock(conn->cc_lockspace, lksb->lksb_fsdlm.sb_lkid, | |
a796d286 | 716 | flags, &lksb->lksb_fsdlm, lksb); |
cf4d8d75 DT |
717 | return ret; |
718 | } | |
719 | ||
c0e41338 | 720 | static int user_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 DT |
721 | { |
722 | return lksb->lksb_fsdlm.sb_status; | |
723 | } | |
724 | ||
c0e41338 | 725 | static int user_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
726 | { |
727 | int invalid = lksb->lksb_fsdlm.sb_flags & DLM_SBF_VALNOTVALID; | |
728 | ||
729 | return !invalid; | |
730 | } | |
731 | ||
c0e41338 | 732 | static void *user_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 | 733 | { |
66f502a4 DT |
734 | if (!lksb->lksb_fsdlm.sb_lvbptr) |
735 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + | |
736 | sizeof(struct dlm_lksb); | |
cf4d8d75 DT |
737 | return (void *)(lksb->lksb_fsdlm.sb_lvbptr); |
738 | } | |
739 | ||
c0e41338 | 740 | static void user_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 DT |
741 | { |
742 | } | |
743 | ||
53da4939 MF |
744 | static int user_plock(struct ocfs2_cluster_connection *conn, |
745 | u64 ino, | |
746 | struct file *file, | |
747 | int cmd, | |
748 | struct file_lock *fl) | |
749 | { | |
750 | /* | |
751 | * This more or less just demuxes the plock request into any | |
752 | * one of three dlm calls. | |
753 | * | |
754 | * Internally, fs/dlm will pass these to a misc device, which | |
755 | * a userspace daemon will read and write to. | |
756 | * | |
757 | * For now, cancel requests (which happen internally only), | |
758 | * are turned into unlocks. Most of this function taken from | |
759 | * gfs2_lock. | |
760 | */ | |
761 | ||
762 | if (cmd == F_CANCELLK) { | |
763 | cmd = F_SETLK; | |
764 | fl->fl_type = F_UNLCK; | |
765 | } | |
766 | ||
767 | if (IS_GETLK(cmd)) | |
768 | return dlm_posix_get(conn->cc_lockspace, ino, file, fl); | |
769 | else if (fl->fl_type == F_UNLCK) | |
770 | return dlm_posix_unlock(conn->cc_lockspace, ino, file, fl); | |
771 | else | |
772 | return dlm_posix_lock(conn->cc_lockspace, ino, file, cmd, fl); | |
773 | } | |
774 | ||
cf4d8d75 DT |
775 | /* |
776 | * Compare a requested locking protocol version against the current one. | |
777 | * | |
778 | * If the major numbers are different, they are incompatible. | |
779 | * If the current minor is greater than the request, they are incompatible. | |
780 | * If the current minor is less than or equal to the request, they are | |
781 | * compatible, and the requester should run at the current minor version. | |
782 | */ | |
783 | static int fs_protocol_compare(struct ocfs2_protocol_version *existing, | |
784 | struct ocfs2_protocol_version *request) | |
785 | { | |
786 | if (existing->pv_major != request->pv_major) | |
787 | return 1; | |
788 | ||
789 | if (existing->pv_minor > request->pv_minor) | |
790 | return 1; | |
791 | ||
792 | if (existing->pv_minor < request->pv_minor) | |
793 | request->pv_minor = existing->pv_minor; | |
794 | ||
795 | return 0; | |
796 | } | |
797 | ||
41503630 GR |
798 | static void lvb_to_version(char *lvb, struct ocfs2_protocol_version *ver) |
799 | { | |
800 | struct ocfs2_protocol_version *pv = | |
801 | (struct ocfs2_protocol_version *)lvb; | |
802 | /* | |
803 | * ocfs2_protocol_version has two u8 variables, so we don't | |
804 | * need any endian conversion. | |
805 | */ | |
806 | ver->pv_major = pv->pv_major; | |
807 | ver->pv_minor = pv->pv_minor; | |
808 | } | |
809 | ||
810 | static void version_to_lvb(struct ocfs2_protocol_version *ver, char *lvb) | |
811 | { | |
812 | struct ocfs2_protocol_version *pv = | |
813 | (struct ocfs2_protocol_version *)lvb; | |
814 | /* | |
815 | * ocfs2_protocol_version has two u8 variables, so we don't | |
816 | * need any endian conversion. | |
817 | */ | |
818 | pv->pv_major = ver->pv_major; | |
819 | pv->pv_minor = ver->pv_minor; | |
820 | } | |
821 | ||
822 | static void sync_wait_cb(void *arg) | |
823 | { | |
824 | struct ocfs2_cluster_connection *conn = arg; | |
825 | struct ocfs2_live_connection *lc = conn->cc_private; | |
826 | complete(&lc->oc_sync_wait); | |
827 | } | |
828 | ||
829 | static int sync_unlock(struct ocfs2_cluster_connection *conn, | |
830 | struct dlm_lksb *lksb, char *name) | |
831 | { | |
832 | int error; | |
833 | struct ocfs2_live_connection *lc = conn->cc_private; | |
834 | ||
835 | error = dlm_unlock(conn->cc_lockspace, lksb->sb_lkid, 0, lksb, conn); | |
836 | if (error) { | |
837 | printk(KERN_ERR "%s lkid %x error %d\n", | |
838 | name, lksb->sb_lkid, error); | |
839 | return error; | |
840 | } | |
841 | ||
842 | wait_for_completion(&lc->oc_sync_wait); | |
843 | ||
844 | if (lksb->sb_status != -DLM_EUNLOCK) { | |
845 | printk(KERN_ERR "%s lkid %x status %d\n", | |
846 | name, lksb->sb_lkid, lksb->sb_status); | |
847 | return -1; | |
848 | } | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static int sync_lock(struct ocfs2_cluster_connection *conn, | |
853 | int mode, uint32_t flags, | |
854 | struct dlm_lksb *lksb, char *name) | |
855 | { | |
856 | int error, status; | |
857 | struct ocfs2_live_connection *lc = conn->cc_private; | |
858 | ||
859 | error = dlm_lock(conn->cc_lockspace, mode, lksb, flags, | |
860 | name, strlen(name), | |
861 | 0, sync_wait_cb, conn, NULL); | |
862 | if (error) { | |
863 | printk(KERN_ERR "%s lkid %x flags %x mode %d error %d\n", | |
864 | name, lksb->sb_lkid, flags, mode, error); | |
865 | return error; | |
866 | } | |
867 | ||
868 | wait_for_completion(&lc->oc_sync_wait); | |
869 | ||
870 | status = lksb->sb_status; | |
871 | ||
872 | if (status && status != -EAGAIN) { | |
873 | printk(KERN_ERR "%s lkid %x flags %x mode %d status %d\n", | |
874 | name, lksb->sb_lkid, flags, mode, status); | |
875 | } | |
876 | ||
877 | return status; | |
878 | } | |
879 | ||
880 | ||
881 | static int version_lock(struct ocfs2_cluster_connection *conn, int mode, | |
882 | int flags) | |
883 | { | |
884 | struct ocfs2_live_connection *lc = conn->cc_private; | |
885 | return sync_lock(conn, mode, flags, | |
886 | &lc->oc_version_lksb, VERSION_LOCK); | |
887 | } | |
888 | ||
889 | static int version_unlock(struct ocfs2_cluster_connection *conn) | |
890 | { | |
891 | struct ocfs2_live_connection *lc = conn->cc_private; | |
892 | return sync_unlock(conn, &lc->oc_version_lksb, VERSION_LOCK); | |
893 | } | |
894 | ||
c994c2eb GR |
895 | /* get_protocol_version() |
896 | * | |
897 | * To exchange ocfs2 versioning, we use the LVB of the version dlm lock. | |
898 | * The algorithm is: | |
899 | * 1. Attempt to take the lock in EX mode (non-blocking). | |
900 | * 2. If successful (which means it is the first mount), write the | |
901 | * version number and downconvert to PR lock. | |
902 | * 3. If unsuccessful (returns -EAGAIN), read the version from the LVB after | |
903 | * taking the PR lock. | |
904 | */ | |
905 | ||
906 | static int get_protocol_version(struct ocfs2_cluster_connection *conn) | |
907 | { | |
908 | int ret; | |
909 | struct ocfs2_live_connection *lc = conn->cc_private; | |
910 | struct ocfs2_protocol_version pv; | |
911 | ||
912 | running_proto.pv_major = | |
913 | ocfs2_user_plugin.sp_max_proto.pv_major; | |
914 | running_proto.pv_minor = | |
915 | ocfs2_user_plugin.sp_max_proto.pv_minor; | |
916 | ||
917 | lc->oc_version_lksb.sb_lvbptr = lc->oc_lvb; | |
918 | ret = version_lock(conn, DLM_LOCK_EX, | |
919 | DLM_LKF_VALBLK|DLM_LKF_NOQUEUE); | |
920 | if (!ret) { | |
921 | conn->cc_version.pv_major = running_proto.pv_major; | |
922 | conn->cc_version.pv_minor = running_proto.pv_minor; | |
923 | version_to_lvb(&running_proto, lc->oc_lvb); | |
924 | version_lock(conn, DLM_LOCK_PR, DLM_LKF_CONVERT|DLM_LKF_VALBLK); | |
925 | } else if (ret == -EAGAIN) { | |
926 | ret = version_lock(conn, DLM_LOCK_PR, DLM_LKF_VALBLK); | |
927 | if (ret) | |
928 | goto out; | |
929 | lvb_to_version(lc->oc_lvb, &pv); | |
930 | ||
931 | if ((pv.pv_major != running_proto.pv_major) || | |
932 | (pv.pv_minor > running_proto.pv_minor)) { | |
933 | ret = -EINVAL; | |
934 | goto out; | |
935 | } | |
936 | ||
937 | conn->cc_version.pv_major = pv.pv_major; | |
938 | conn->cc_version.pv_minor = pv.pv_minor; | |
939 | } | |
940 | out: | |
941 | return ret; | |
942 | } | |
943 | ||
66e188fc GR |
944 | static void user_recover_prep(void *arg) |
945 | { | |
946 | } | |
947 | ||
948 | static void user_recover_slot(void *arg, struct dlm_slot *slot) | |
949 | { | |
950 | struct ocfs2_cluster_connection *conn = arg; | |
951 | printk(KERN_INFO "ocfs2: Node %d/%d down. Initiating recovery.\n", | |
952 | slot->nodeid, slot->slot); | |
953 | conn->cc_recovery_handler(slot->nodeid, conn->cc_recovery_data); | |
954 | ||
955 | } | |
956 | ||
957 | static void user_recover_done(void *arg, struct dlm_slot *slots, | |
958 | int num_slots, int our_slot, | |
959 | uint32_t generation) | |
960 | { | |
961 | struct ocfs2_cluster_connection *conn = arg; | |
962 | struct ocfs2_live_connection *lc = conn->cc_private; | |
963 | int i; | |
964 | ||
965 | for (i = 0; i < num_slots; i++) | |
966 | if (slots[i].slot == our_slot) { | |
967 | atomic_set(&lc->oc_this_node, slots[i].nodeid); | |
968 | break; | |
969 | } | |
970 | ||
971 | lc->oc_our_slot = our_slot; | |
c994c2eb | 972 | wake_up(&lc->oc_wait); |
66e188fc GR |
973 | } |
974 | ||
16eac4be | 975 | static const struct dlm_lockspace_ops ocfs2_ls_ops = { |
66e188fc GR |
976 | .recover_prep = user_recover_prep, |
977 | .recover_slot = user_recover_slot, | |
978 | .recover_done = user_recover_done, | |
979 | }; | |
980 | ||
c994c2eb GR |
981 | static int user_cluster_disconnect(struct ocfs2_cluster_connection *conn) |
982 | { | |
983 | version_unlock(conn); | |
984 | dlm_release_lockspace(conn->cc_lockspace, 2); | |
985 | conn->cc_lockspace = NULL; | |
986 | ocfs2_live_connection_drop(conn->cc_private); | |
987 | conn->cc_private = NULL; | |
988 | return 0; | |
989 | } | |
990 | ||
cf4d8d75 DT |
991 | static int user_cluster_connect(struct ocfs2_cluster_connection *conn) |
992 | { | |
993 | dlm_lockspace_t *fsdlm; | |
24aa3386 | 994 | struct ocfs2_live_connection *lc; |
c994c2eb | 995 | int rc, ops_rv; |
cf4d8d75 DT |
996 | |
997 | BUG_ON(conn == NULL); | |
998 | ||
24aa3386 | 999 | lc = kzalloc(sizeof(struct ocfs2_live_connection), GFP_KERNEL); |
43ee9cad ME |
1000 | if (!lc) |
1001 | return -ENOMEM; | |
24aa3386 | 1002 | |
c994c2eb GR |
1003 | init_waitqueue_head(&lc->oc_wait); |
1004 | init_completion(&lc->oc_sync_wait); | |
1005 | atomic_set(&lc->oc_this_node, 0); | |
1006 | conn->cc_private = lc; | |
1007 | lc->oc_type = NO_CONTROLD; | |
1008 | ||
1009 | rc = dlm_new_lockspace(conn->cc_name, conn->cc_cluster_name, | |
1010 | DLM_LSFL_FS, DLM_LVB_LEN, | |
1011 | &ocfs2_ls_ops, conn, &ops_rv, &fsdlm); | |
1012 | if (rc) | |
1013 | goto out; | |
1014 | ||
1015 | if (ops_rv == -EOPNOTSUPP) { | |
1016 | lc->oc_type = WITH_CONTROLD; | |
1017 | printk(KERN_NOTICE "ocfs2: You seem to be using an older " | |
1018 | "version of dlm_controld and/or ocfs2-tools." | |
1019 | " Please consider upgrading.\n"); | |
1020 | } else if (ops_rv) { | |
1021 | rc = ops_rv; | |
1022 | goto out; | |
1023 | } | |
1024 | conn->cc_lockspace = fsdlm; | |
1025 | ||
24aa3386 | 1026 | rc = ocfs2_live_connection_attach(conn, lc); |
cf4d8d75 DT |
1027 | if (rc) |
1028 | goto out; | |
1029 | ||
c994c2eb GR |
1030 | if (lc->oc_type == NO_CONTROLD) { |
1031 | rc = get_protocol_version(conn); | |
1032 | if (rc) { | |
1033 | printk(KERN_ERR "ocfs2: Could not determine" | |
1034 | " locking version\n"); | |
1035 | user_cluster_disconnect(conn); | |
1036 | goto out; | |
1037 | } | |
1038 | wait_event(lc->oc_wait, (atomic_read(&lc->oc_this_node) > 0)); | |
1039 | } | |
1040 | ||
cf4d8d75 DT |
1041 | /* |
1042 | * running_proto must have been set before we allowed any mounts | |
1043 | * to proceed. | |
1044 | */ | |
1045 | if (fs_protocol_compare(&running_proto, &conn->cc_version)) { | |
1046 | printk(KERN_ERR | |
1047 | "Unable to mount with fs locking protocol version " | |
c994c2eb | 1048 | "%u.%u because negotiated protocol is %u.%u\n", |
cf4d8d75 DT |
1049 | conn->cc_version.pv_major, conn->cc_version.pv_minor, |
1050 | running_proto.pv_major, running_proto.pv_minor); | |
1051 | rc = -EPROTO; | |
24aa3386 GR |
1052 | ocfs2_live_connection_drop(lc); |
1053 | lc = NULL; | |
cf4d8d75 DT |
1054 | } |
1055 | ||
cf4d8d75 | 1056 | out: |
fd90d4df | 1057 | if (rc) |
24aa3386 | 1058 | kfree(lc); |
cf4d8d75 DT |
1059 | return rc; |
1060 | } | |
1061 | ||
cf4d8d75 | 1062 | |
3e834151 GR |
1063 | static int user_cluster_this_node(struct ocfs2_cluster_connection *conn, |
1064 | unsigned int *this_node) | |
cf4d8d75 DT |
1065 | { |
1066 | int rc; | |
3e834151 | 1067 | struct ocfs2_live_connection *lc = conn->cc_private; |
cf4d8d75 | 1068 | |
3e834151 GR |
1069 | if (lc->oc_type == WITH_CONTROLD) |
1070 | rc = ocfs2_control_get_this_node(); | |
c994c2eb GR |
1071 | else if (lc->oc_type == NO_CONTROLD) |
1072 | rc = atomic_read(&lc->oc_this_node); | |
3e834151 GR |
1073 | else |
1074 | rc = -EINVAL; | |
c994c2eb | 1075 | |
cf4d8d75 DT |
1076 | if (rc < 0) |
1077 | return rc; | |
1078 | ||
1079 | *this_node = rc; | |
1080 | return 0; | |
1081 | } | |
1082 | ||
a12630b1 | 1083 | static struct ocfs2_stack_operations ocfs2_user_plugin_ops = { |
cf4d8d75 DT |
1084 | .connect = user_cluster_connect, |
1085 | .disconnect = user_cluster_disconnect, | |
1086 | .this_node = user_cluster_this_node, | |
1087 | .dlm_lock = user_dlm_lock, | |
1088 | .dlm_unlock = user_dlm_unlock, | |
1089 | .lock_status = user_dlm_lock_status, | |
1c520dfb | 1090 | .lvb_valid = user_dlm_lvb_valid, |
cf4d8d75 | 1091 | .lock_lvb = user_dlm_lvb, |
53da4939 | 1092 | .plock = user_plock, |
cf4d8d75 DT |
1093 | .dump_lksb = user_dlm_dump_lksb, |
1094 | }; | |
1095 | ||
a12630b1 | 1096 | static struct ocfs2_stack_plugin ocfs2_user_plugin = { |
cf4d8d75 | 1097 | .sp_name = "user", |
a12630b1 | 1098 | .sp_ops = &ocfs2_user_plugin_ops, |
cf4d8d75 DT |
1099 | .sp_owner = THIS_MODULE, |
1100 | }; | |
1101 | ||
1102 | ||
a12630b1 | 1103 | static int __init ocfs2_user_plugin_init(void) |
6427a727 | 1104 | { |
cf4d8d75 DT |
1105 | int rc; |
1106 | ||
1107 | rc = ocfs2_control_init(); | |
1108 | if (!rc) { | |
a12630b1 | 1109 | rc = ocfs2_stack_glue_register(&ocfs2_user_plugin); |
cf4d8d75 DT |
1110 | if (rc) |
1111 | ocfs2_control_exit(); | |
1112 | } | |
1113 | ||
1114 | return rc; | |
6427a727 JB |
1115 | } |
1116 | ||
a12630b1 | 1117 | static void __exit ocfs2_user_plugin_exit(void) |
8adf0536 | 1118 | { |
a12630b1 | 1119 | ocfs2_stack_glue_unregister(&ocfs2_user_plugin); |
6427a727 | 1120 | ocfs2_control_exit(); |
8adf0536 JB |
1121 | } |
1122 | ||
1123 | MODULE_AUTHOR("Oracle"); | |
1124 | MODULE_DESCRIPTION("ocfs2 driver for userspace cluster stacks"); | |
1125 | MODULE_LICENSE("GPL"); | |
a12630b1 JB |
1126 | module_init(ocfs2_user_plugin_init); |
1127 | module_exit(ocfs2_user_plugin_exit); |