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50acfb2b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fa60ce2c | 2 | /* |
8adf0536 JB |
3 | * stack_user.c |
4 | * | |
5 | * Code which interfaces ocfs2 with fs/dlm and a userspace stack. | |
6 | * | |
7 | * Copyright (C) 2007 Oracle. All rights reserved. | |
8adf0536 JB |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
6427a727 | 11 | #include <linux/fs.h> |
5970e15d | 12 | #include <linux/filelock.h> |
6427a727 JB |
13 | #include <linux/miscdevice.h> |
14 | #include <linux/mutex.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
6427a727 | 16 | #include <linux/reboot.h> |
c994c2eb | 17 | #include <linux/sched.h> |
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
8adf0536 JB |
19 | |
20 | #include "stackglue.h" | |
21 | ||
53da4939 | 22 | #include <linux/dlm_plock.h> |
8adf0536 | 23 | |
6427a727 JB |
24 | /* |
25 | * The control protocol starts with a handshake. Until the handshake | |
26 | * is complete, the control device will fail all write(2)s. | |
27 | * | |
28 | * The handshake is simple. First, the client reads until EOF. Each line | |
29 | * of output is a supported protocol tag. All protocol tags are a single | |
30 | * character followed by a two hex digit version number. Currently the | |
31 | * only things supported is T01, for "Text-base version 0x01". Next, the | |
de870ef0 JB |
32 | * client writes the version they would like to use, including the newline. |
33 | * Thus, the protocol tag is 'T01\n'. If the version tag written is | |
34 | * unknown, -EINVAL is returned. Once the negotiation is complete, the | |
35 | * client can start sending messages. | |
36 | * | |
d4b95eef | 37 | * The T01 protocol has three messages. First is the "SETN" message. |
3cfd4ab6 JB |
38 | * It has the following syntax: |
39 | * | |
40 | * SETN<space><8-char-hex-nodenum><newline> | |
41 | * | |
42 | * This is 14 characters. | |
43 | * | |
44 | * The "SETN" message must be the first message following the protocol. | |
45 | * It tells ocfs2_control the local node number. | |
46 | * | |
d4b95eef JB |
47 | * Next comes the "SETV" message. It has the following syntax: |
48 | * | |
49 | * SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> | |
50 | * | |
51 | * This is 11 characters. | |
52 | * | |
53 | * The "SETV" message sets the filesystem locking protocol version as | |
54 | * negotiated by the client. The client negotiates based on the maximum | |
55 | * version advertised in /sys/fs/ocfs2/max_locking_protocol. The major | |
56 | * number from the "SETV" message must match | |
e603cfb0 JB |
57 | * ocfs2_user_plugin.sp_max_proto.pv_major, and the minor number |
58 | * must be less than or equal to ...sp_max_version.pv_minor. | |
d4b95eef JB |
59 | * |
60 | * Once this information has been set, mounts will be allowed. From this | |
61 | * point on, the "DOWN" message can be sent for node down notification. | |
62 | * It has the following syntax: | |
de870ef0 JB |
63 | * |
64 | * DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> | |
65 | * | |
66 | * eg: | |
67 | * | |
68 | * DOWN 632A924FDD844190BDA93C0DF6B94899 00000001\n | |
69 | * | |
70 | * This is 47 characters. | |
6427a727 JB |
71 | */ |
72 | ||
462c7e6a JB |
73 | /* |
74 | * Whether or not the client has done the handshake. | |
75 | * For now, we have just one protocol version. | |
76 | */ | |
77 | #define OCFS2_CONTROL_PROTO "T01\n" | |
78 | #define OCFS2_CONTROL_PROTO_LEN 4 | |
3cfd4ab6 JB |
79 | |
80 | /* Handshake states */ | |
462c7e6a JB |
81 | #define OCFS2_CONTROL_HANDSHAKE_INVALID (0) |
82 | #define OCFS2_CONTROL_HANDSHAKE_READ (1) | |
3cfd4ab6 JB |
83 | #define OCFS2_CONTROL_HANDSHAKE_PROTOCOL (2) |
84 | #define OCFS2_CONTROL_HANDSHAKE_VALID (3) | |
85 | ||
86 | /* Messages */ | |
87 | #define OCFS2_CONTROL_MESSAGE_OP_LEN 4 | |
88 | #define OCFS2_CONTROL_MESSAGE_SETNODE_OP "SETN" | |
89 | #define OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN 14 | |
d4b95eef JB |
90 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_OP "SETV" |
91 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN 11 | |
3cfd4ab6 | 92 | #define OCFS2_CONTROL_MESSAGE_DOWN_OP "DOWN" |
de870ef0 JB |
93 | #define OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN 47 |
94 | #define OCFS2_TEXT_UUID_LEN 32 | |
d4b95eef | 95 | #define OCFS2_CONTROL_MESSAGE_VERNUM_LEN 2 |
de870ef0 | 96 | #define OCFS2_CONTROL_MESSAGE_NODENUM_LEN 8 |
41503630 | 97 | #define VERSION_LOCK "version_lock" |
462c7e6a | 98 | |
3e834151 GR |
99 | enum ocfs2_connection_type { |
100 | WITH_CONTROLD, | |
101 | NO_CONTROLD | |
102 | }; | |
103 | ||
6427a727 JB |
104 | /* |
105 | * ocfs2_live_connection is refcounted because the filesystem and | |
106 | * miscdevice sides can detach in different order. Let's just be safe. | |
107 | */ | |
108 | struct ocfs2_live_connection { | |
109 | struct list_head oc_list; | |
110 | struct ocfs2_cluster_connection *oc_conn; | |
3e834151 | 111 | enum ocfs2_connection_type oc_type; |
66e188fc GR |
112 | atomic_t oc_this_node; |
113 | int oc_our_slot; | |
41503630 GR |
114 | struct dlm_lksb oc_version_lksb; |
115 | char oc_lvb[DLM_LVB_LEN]; | |
116 | struct completion oc_sync_wait; | |
c994c2eb | 117 | wait_queue_head_t oc_wait; |
6427a727 JB |
118 | }; |
119 | ||
462c7e6a JB |
120 | struct ocfs2_control_private { |
121 | struct list_head op_list; | |
122 | int op_state; | |
3cfd4ab6 | 123 | int op_this_node; |
d4b95eef | 124 | struct ocfs2_protocol_version op_proto; |
3cfd4ab6 JB |
125 | }; |
126 | ||
127 | /* SETN<space><8-char-hex-nodenum><newline> */ | |
128 | struct ocfs2_control_message_setn { | |
129 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
130 | char space; | |
131 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; | |
132 | char newline; | |
133 | }; | |
134 | ||
d4b95eef JB |
135 | /* SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> */ |
136 | struct ocfs2_control_message_setv { | |
137 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
138 | char space1; | |
139 | char major[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; | |
140 | char space2; | |
141 | char minor[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; | |
142 | char newline; | |
143 | }; | |
144 | ||
3cfd4ab6 JB |
145 | /* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */ |
146 | struct ocfs2_control_message_down { | |
147 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
148 | char space1; | |
149 | char uuid[OCFS2_TEXT_UUID_LEN]; | |
150 | char space2; | |
151 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; | |
152 | char newline; | |
153 | }; | |
154 | ||
155 | union ocfs2_control_message { | |
156 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; | |
157 | struct ocfs2_control_message_setn u_setn; | |
d4b95eef | 158 | struct ocfs2_control_message_setv u_setv; |
3cfd4ab6 | 159 | struct ocfs2_control_message_down u_down; |
462c7e6a JB |
160 | }; |
161 | ||
a12630b1 | 162 | static struct ocfs2_stack_plugin ocfs2_user_plugin; |
cf4d8d75 | 163 | |
6427a727 | 164 | static atomic_t ocfs2_control_opened; |
3cfd4ab6 | 165 | static int ocfs2_control_this_node = -1; |
d4b95eef | 166 | static struct ocfs2_protocol_version running_proto; |
6427a727 JB |
167 | |
168 | static LIST_HEAD(ocfs2_live_connection_list); | |
462c7e6a | 169 | static LIST_HEAD(ocfs2_control_private_list); |
6427a727 JB |
170 | static DEFINE_MUTEX(ocfs2_control_lock); |
171 | ||
462c7e6a JB |
172 | static inline void ocfs2_control_set_handshake_state(struct file *file, |
173 | int state) | |
174 | { | |
175 | struct ocfs2_control_private *p = file->private_data; | |
176 | p->op_state = state; | |
177 | } | |
178 | ||
179 | static inline int ocfs2_control_get_handshake_state(struct file *file) | |
180 | { | |
181 | struct ocfs2_control_private *p = file->private_data; | |
182 | return p->op_state; | |
183 | } | |
184 | ||
6427a727 JB |
185 | static struct ocfs2_live_connection *ocfs2_connection_find(const char *name) |
186 | { | |
187 | size_t len = strlen(name); | |
188 | struct ocfs2_live_connection *c; | |
189 | ||
190 | BUG_ON(!mutex_is_locked(&ocfs2_control_lock)); | |
191 | ||
192 | list_for_each_entry(c, &ocfs2_live_connection_list, oc_list) { | |
193 | if ((c->oc_conn->cc_namelen == len) && | |
194 | !strncmp(c->oc_conn->cc_name, name, len)) | |
195 | return c; | |
196 | } | |
197 | ||
226291aa | 198 | return NULL; |
6427a727 JB |
199 | } |
200 | ||
201 | /* | |
202 | * ocfs2_live_connection structures are created underneath the ocfs2 | |
203 | * mount path. Since the VFS prevents multiple calls to | |
204 | * fill_super(), we can't get dupes here. | |
205 | */ | |
24aa3386 GR |
206 | static int ocfs2_live_connection_attach(struct ocfs2_cluster_connection *conn, |
207 | struct ocfs2_live_connection *c) | |
6427a727 JB |
208 | { |
209 | int rc = 0; | |
6427a727 JB |
210 | |
211 | mutex_lock(&ocfs2_control_lock); | |
212 | c->oc_conn = conn; | |
213 | ||
c994c2eb | 214 | if ((c->oc_type == NO_CONTROLD) || atomic_read(&ocfs2_control_opened)) |
6427a727 JB |
215 | list_add(&c->oc_list, &ocfs2_live_connection_list); |
216 | else { | |
217 | printk(KERN_ERR | |
218 | "ocfs2: Userspace control daemon is not present\n"); | |
219 | rc = -ESRCH; | |
220 | } | |
221 | ||
222 | mutex_unlock(&ocfs2_control_lock); | |
6427a727 JB |
223 | return rc; |
224 | } | |
225 | ||
226 | /* | |
227 | * This function disconnects the cluster connection from ocfs2_control. | |
228 | * Afterwards, userspace can't affect the cluster connection. | |
229 | */ | |
230 | static void ocfs2_live_connection_drop(struct ocfs2_live_connection *c) | |
231 | { | |
232 | mutex_lock(&ocfs2_control_lock); | |
233 | list_del_init(&c->oc_list); | |
234 | c->oc_conn = NULL; | |
235 | mutex_unlock(&ocfs2_control_lock); | |
236 | ||
237 | kfree(c); | |
238 | } | |
239 | ||
3cfd4ab6 JB |
240 | static int ocfs2_control_cfu(void *target, size_t target_len, |
241 | const char __user *buf, size_t count) | |
462c7e6a JB |
242 | { |
243 | /* The T01 expects write(2) calls to have exactly one command */ | |
3cfd4ab6 JB |
244 | if ((count != target_len) || |
245 | (count > sizeof(union ocfs2_control_message))) | |
462c7e6a JB |
246 | return -EINVAL; |
247 | ||
248 | if (copy_from_user(target, buf, target_len)) | |
249 | return -EFAULT; | |
250 | ||
3cfd4ab6 | 251 | return 0; |
462c7e6a JB |
252 | } |
253 | ||
3cfd4ab6 JB |
254 | static ssize_t ocfs2_control_validate_protocol(struct file *file, |
255 | const char __user *buf, | |
256 | size_t count) | |
462c7e6a JB |
257 | { |
258 | ssize_t ret; | |
259 | char kbuf[OCFS2_CONTROL_PROTO_LEN]; | |
260 | ||
261 | ret = ocfs2_control_cfu(kbuf, OCFS2_CONTROL_PROTO_LEN, | |
262 | buf, count); | |
3cfd4ab6 | 263 | if (ret) |
462c7e6a JB |
264 | return ret; |
265 | ||
266 | if (strncmp(kbuf, OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN)) | |
267 | return -EINVAL; | |
268 | ||
462c7e6a | 269 | ocfs2_control_set_handshake_state(file, |
3cfd4ab6 | 270 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
462c7e6a JB |
271 | |
272 | return count; | |
273 | } | |
274 | ||
de870ef0 JB |
275 | static void ocfs2_control_send_down(const char *uuid, |
276 | int nodenum) | |
277 | { | |
278 | struct ocfs2_live_connection *c; | |
279 | ||
280 | mutex_lock(&ocfs2_control_lock); | |
281 | ||
282 | c = ocfs2_connection_find(uuid); | |
283 | if (c) { | |
284 | BUG_ON(c->oc_conn == NULL); | |
285 | c->oc_conn->cc_recovery_handler(nodenum, | |
286 | c->oc_conn->cc_recovery_data); | |
287 | } | |
288 | ||
289 | mutex_unlock(&ocfs2_control_lock); | |
290 | } | |
291 | ||
3cfd4ab6 JB |
292 | /* |
293 | * Called whenever configuration elements are sent to /dev/ocfs2_control. | |
294 | * If all configuration elements are present, try to set the global | |
d4b95eef JB |
295 | * values. If there is a problem, return an error. Skip any missing |
296 | * elements, and only bump ocfs2_control_opened when we have all elements | |
297 | * and are successful. | |
3cfd4ab6 JB |
298 | */ |
299 | static int ocfs2_control_install_private(struct file *file) | |
300 | { | |
301 | int rc = 0; | |
302 | int set_p = 1; | |
303 | struct ocfs2_control_private *p = file->private_data; | |
de870ef0 | 304 | |
3cfd4ab6 JB |
305 | BUG_ON(p->op_state != OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
306 | ||
d4b95eef JB |
307 | mutex_lock(&ocfs2_control_lock); |
308 | ||
309 | if (p->op_this_node < 0) { | |
3cfd4ab6 | 310 | set_p = 0; |
d4b95eef JB |
311 | } else if ((ocfs2_control_this_node >= 0) && |
312 | (ocfs2_control_this_node != p->op_this_node)) { | |
313 | rc = -EINVAL; | |
314 | goto out_unlock; | |
315 | } | |
3cfd4ab6 | 316 | |
d4b95eef JB |
317 | if (!p->op_proto.pv_major) { |
318 | set_p = 0; | |
319 | } else if (!list_empty(&ocfs2_live_connection_list) && | |
320 | ((running_proto.pv_major != p->op_proto.pv_major) || | |
321 | (running_proto.pv_minor != p->op_proto.pv_minor))) { | |
3cfd4ab6 | 322 | rc = -EINVAL; |
d4b95eef JB |
323 | goto out_unlock; |
324 | } | |
325 | ||
326 | if (set_p) { | |
327 | ocfs2_control_this_node = p->op_this_node; | |
328 | running_proto.pv_major = p->op_proto.pv_major; | |
329 | running_proto.pv_minor = p->op_proto.pv_minor; | |
330 | } | |
331 | ||
332 | out_unlock: | |
3cfd4ab6 JB |
333 | mutex_unlock(&ocfs2_control_lock); |
334 | ||
335 | if (!rc && set_p) { | |
336 | /* We set the global values successfully */ | |
337 | atomic_inc(&ocfs2_control_opened); | |
338 | ocfs2_control_set_handshake_state(file, | |
339 | OCFS2_CONTROL_HANDSHAKE_VALID); | |
340 | } | |
341 | ||
342 | return rc; | |
343 | } | |
344 | ||
cf4d8d75 DT |
345 | static int ocfs2_control_get_this_node(void) |
346 | { | |
347 | int rc; | |
348 | ||
349 | mutex_lock(&ocfs2_control_lock); | |
350 | if (ocfs2_control_this_node < 0) | |
351 | rc = -EINVAL; | |
352 | else | |
353 | rc = ocfs2_control_this_node; | |
354 | mutex_unlock(&ocfs2_control_lock); | |
355 | ||
356 | return rc; | |
357 | } | |
358 | ||
3cfd4ab6 JB |
359 | static int ocfs2_control_do_setnode_msg(struct file *file, |
360 | struct ocfs2_control_message_setn *msg) | |
de870ef0 | 361 | { |
de870ef0 | 362 | long nodenum; |
3cfd4ab6 JB |
363 | char *ptr = NULL; |
364 | struct ocfs2_control_private *p = file->private_data; | |
de870ef0 | 365 | |
3cfd4ab6 JB |
366 | if (ocfs2_control_get_handshake_state(file) != |
367 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) | |
368 | return -EINVAL; | |
de870ef0 | 369 | |
3cfd4ab6 JB |
370 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, |
371 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
372 | return -EINVAL; | |
373 | ||
374 | if ((msg->space != ' ') || (msg->newline != '\n')) | |
375 | return -EINVAL; | |
376 | msg->space = msg->newline = '\0'; | |
377 | ||
378 | nodenum = simple_strtol(msg->nodestr, &ptr, 16); | |
379 | if (!ptr || *ptr) | |
380 | return -EINVAL; | |
381 | ||
382 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || | |
383 | (nodenum > INT_MAX) || (nodenum < 0)) | |
384 | return -ERANGE; | |
385 | p->op_this_node = nodenum; | |
386 | ||
387 | return ocfs2_control_install_private(file); | |
388 | } | |
389 | ||
d4b95eef JB |
390 | static int ocfs2_control_do_setversion_msg(struct file *file, |
391 | struct ocfs2_control_message_setv *msg) | |
447a5647 | 392 | { |
d4b95eef JB |
393 | long major, minor; |
394 | char *ptr = NULL; | |
395 | struct ocfs2_control_private *p = file->private_data; | |
396 | struct ocfs2_protocol_version *max = | |
e603cfb0 | 397 | &ocfs2_user_plugin.sp_max_proto; |
d4b95eef JB |
398 | |
399 | if (ocfs2_control_get_handshake_state(file) != | |
400 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) | |
401 | return -EINVAL; | |
402 | ||
403 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, | |
404 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
405 | return -EINVAL; | |
406 | ||
407 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || | |
408 | (msg->newline != '\n')) | |
409 | return -EINVAL; | |
410 | msg->space1 = msg->space2 = msg->newline = '\0'; | |
411 | ||
412 | major = simple_strtol(msg->major, &ptr, 16); | |
413 | if (!ptr || *ptr) | |
414 | return -EINVAL; | |
415 | minor = simple_strtol(msg->minor, &ptr, 16); | |
416 | if (!ptr || *ptr) | |
417 | return -EINVAL; | |
418 | ||
419 | /* | |
420 | * The major must be between 1 and 255, inclusive. The minor | |
421 | * must be between 0 and 255, inclusive. The version passed in | |
422 | * must be within the maximum version supported by the filesystem. | |
423 | */ | |
424 | if ((major == LONG_MIN) || (major == LONG_MAX) || | |
425 | (major > (u8)-1) || (major < 1)) | |
426 | return -ERANGE; | |
427 | if ((minor == LONG_MIN) || (minor == LONG_MAX) || | |
428 | (minor > (u8)-1) || (minor < 0)) | |
429 | return -ERANGE; | |
430 | if ((major != max->pv_major) || | |
431 | (minor > max->pv_minor)) | |
432 | return -EINVAL; | |
433 | ||
434 | p->op_proto.pv_major = major; | |
435 | p->op_proto.pv_minor = minor; | |
436 | ||
437 | return ocfs2_control_install_private(file); | |
438 | } | |
439 | ||
3cfd4ab6 JB |
440 | static int ocfs2_control_do_down_msg(struct file *file, |
441 | struct ocfs2_control_message_down *msg) | |
442 | { | |
443 | long nodenum; | |
444 | char *p = NULL; | |
445 | ||
446 | if (ocfs2_control_get_handshake_state(file) != | |
447 | OCFS2_CONTROL_HANDSHAKE_VALID) | |
448 | return -EINVAL; | |
de870ef0 | 449 | |
3cfd4ab6 JB |
450 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, |
451 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
de870ef0 JB |
452 | return -EINVAL; |
453 | ||
3cfd4ab6 JB |
454 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || |
455 | (msg->newline != '\n')) | |
de870ef0 | 456 | return -EINVAL; |
3cfd4ab6 | 457 | msg->space1 = msg->space2 = msg->newline = '\0'; |
de870ef0 | 458 | |
3cfd4ab6 | 459 | nodenum = simple_strtol(msg->nodestr, &p, 16); |
de870ef0 JB |
460 | if (!p || *p) |
461 | return -EINVAL; | |
462 | ||
463 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || | |
464 | (nodenum > INT_MAX) || (nodenum < 0)) | |
465 | return -ERANGE; | |
466 | ||
3cfd4ab6 | 467 | ocfs2_control_send_down(msg->uuid, nodenum); |
de870ef0 | 468 | |
3cfd4ab6 JB |
469 | return 0; |
470 | } | |
471 | ||
472 | static ssize_t ocfs2_control_message(struct file *file, | |
473 | const char __user *buf, | |
474 | size_t count) | |
475 | { | |
476 | ssize_t ret; | |
477 | union ocfs2_control_message msg; | |
478 | ||
479 | /* Try to catch padding issues */ | |
480 | WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) != | |
481 | (sizeof(msg.u_down.tag) + sizeof(msg.u_down.space1))); | |
482 | ||
483 | memset(&msg, 0, sizeof(union ocfs2_control_message)); | |
484 | ret = ocfs2_control_cfu(&msg, count, buf, count); | |
485 | if (ret) | |
486 | goto out; | |
487 | ||
488 | if ((count == OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN) && | |
489 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, | |
490 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
491 | ret = ocfs2_control_do_setnode_msg(file, &msg.u_setn); | |
d4b95eef JB |
492 | else if ((count == OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN) && |
493 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, | |
494 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
495 | ret = ocfs2_control_do_setversion_msg(file, &msg.u_setv); | |
3cfd4ab6 JB |
496 | else if ((count == OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN) && |
497 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, | |
498 | OCFS2_CONTROL_MESSAGE_OP_LEN)) | |
499 | ret = ocfs2_control_do_down_msg(file, &msg.u_down); | |
500 | else | |
501 | ret = -EINVAL; | |
502 | ||
503 | out: | |
504 | return ret ? ret : count; | |
de870ef0 | 505 | } |
6427a727 JB |
506 | |
507 | static ssize_t ocfs2_control_write(struct file *file, | |
508 | const char __user *buf, | |
509 | size_t count, | |
510 | loff_t *ppos) | |
8adf0536 | 511 | { |
462c7e6a JB |
512 | ssize_t ret; |
513 | ||
514 | switch (ocfs2_control_get_handshake_state(file)) { | |
515 | case OCFS2_CONTROL_HANDSHAKE_INVALID: | |
516 | ret = -EINVAL; | |
517 | break; | |
518 | ||
519 | case OCFS2_CONTROL_HANDSHAKE_READ: | |
3cfd4ab6 JB |
520 | ret = ocfs2_control_validate_protocol(file, buf, |
521 | count); | |
462c7e6a JB |
522 | break; |
523 | ||
3cfd4ab6 | 524 | case OCFS2_CONTROL_HANDSHAKE_PROTOCOL: |
462c7e6a | 525 | case OCFS2_CONTROL_HANDSHAKE_VALID: |
de870ef0 | 526 | ret = ocfs2_control_message(file, buf, count); |
462c7e6a JB |
527 | break; |
528 | ||
529 | default: | |
530 | BUG(); | |
531 | ret = -EIO; | |
532 | break; | |
533 | } | |
534 | ||
535 | return ret; | |
8adf0536 JB |
536 | } |
537 | ||
462c7e6a JB |
538 | /* |
539 | * This is a naive version. If we ever have a new protocol, we'll expand | |
540 | * it. Probably using seq_file. | |
541 | */ | |
6427a727 JB |
542 | static ssize_t ocfs2_control_read(struct file *file, |
543 | char __user *buf, | |
544 | size_t count, | |
545 | loff_t *ppos) | |
546 | { | |
7600c72b | 547 | ssize_t ret; |
462c7e6a | 548 | |
7600c72b AM |
549 | ret = simple_read_from_buffer(buf, count, ppos, |
550 | OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN); | |
462c7e6a JB |
551 | |
552 | /* Have we read the whole protocol list? */ | |
7600c72b | 553 | if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN) |
462c7e6a JB |
554 | ocfs2_control_set_handshake_state(file, |
555 | OCFS2_CONTROL_HANDSHAKE_READ); | |
556 | ||
7600c72b | 557 | return ret; |
6427a727 JB |
558 | } |
559 | ||
560 | static int ocfs2_control_release(struct inode *inode, struct file *file) | |
561 | { | |
462c7e6a JB |
562 | struct ocfs2_control_private *p = file->private_data; |
563 | ||
564 | mutex_lock(&ocfs2_control_lock); | |
565 | ||
566 | if (ocfs2_control_get_handshake_state(file) != | |
567 | OCFS2_CONTROL_HANDSHAKE_VALID) | |
568 | goto out; | |
569 | ||
6427a727 | 570 | if (atomic_dec_and_test(&ocfs2_control_opened)) { |
6427a727 JB |
571 | if (!list_empty(&ocfs2_live_connection_list)) { |
572 | /* XXX: Do bad things! */ | |
573 | printk(KERN_ERR | |
574 | "ocfs2: Unexpected release of ocfs2_control!\n" | |
575 | " Loss of cluster connection requires " | |
576 | "an emergency restart!\n"); | |
577 | emergency_restart(); | |
578 | } | |
d4b95eef JB |
579 | /* |
580 | * Last valid close clears the node number and resets | |
581 | * the locking protocol version | |
582 | */ | |
3cfd4ab6 | 583 | ocfs2_control_this_node = -1; |
d4b95eef | 584 | running_proto.pv_major = 0; |
98acbf63 | 585 | running_proto.pv_minor = 0; |
6427a727 JB |
586 | } |
587 | ||
462c7e6a JB |
588 | out: |
589 | list_del_init(&p->op_list); | |
590 | file->private_data = NULL; | |
591 | ||
592 | mutex_unlock(&ocfs2_control_lock); | |
593 | ||
594 | kfree(p); | |
595 | ||
6427a727 JB |
596 | return 0; |
597 | } | |
598 | ||
599 | static int ocfs2_control_open(struct inode *inode, struct file *file) | |
600 | { | |
462c7e6a JB |
601 | struct ocfs2_control_private *p; |
602 | ||
603 | p = kzalloc(sizeof(struct ocfs2_control_private), GFP_KERNEL); | |
604 | if (!p) | |
605 | return -ENOMEM; | |
3cfd4ab6 | 606 | p->op_this_node = -1; |
462c7e6a JB |
607 | |
608 | mutex_lock(&ocfs2_control_lock); | |
609 | file->private_data = p; | |
610 | list_add(&p->op_list, &ocfs2_control_private_list); | |
611 | mutex_unlock(&ocfs2_control_lock); | |
6427a727 JB |
612 | |
613 | return 0; | |
614 | } | |
615 | ||
616 | static const struct file_operations ocfs2_control_fops = { | |
617 | .open = ocfs2_control_open, | |
618 | .release = ocfs2_control_release, | |
619 | .read = ocfs2_control_read, | |
620 | .write = ocfs2_control_write, | |
621 | .owner = THIS_MODULE, | |
6038f373 | 622 | .llseek = default_llseek, |
6427a727 JB |
623 | }; |
624 | ||
4d8755b5 | 625 | static struct miscdevice ocfs2_control_device = { |
6427a727 JB |
626 | .minor = MISC_DYNAMIC_MINOR, |
627 | .name = "ocfs2_control", | |
628 | .fops = &ocfs2_control_fops, | |
629 | }; | |
630 | ||
631 | static int ocfs2_control_init(void) | |
632 | { | |
633 | int rc; | |
634 | ||
635 | atomic_set(&ocfs2_control_opened, 0); | |
636 | ||
637 | rc = misc_register(&ocfs2_control_device); | |
638 | if (rc) | |
639 | printk(KERN_ERR | |
640 | "ocfs2: Unable to register ocfs2_control device " | |
641 | "(errno %d)\n", | |
642 | -rc); | |
643 | ||
644 | return rc; | |
645 | } | |
646 | ||
647 | static void ocfs2_control_exit(void) | |
648 | { | |
f368ed60 | 649 | misc_deregister(&ocfs2_control_device); |
6427a727 JB |
650 | } |
651 | ||
cf4d8d75 DT |
652 | static void fsdlm_lock_ast_wrapper(void *astarg) |
653 | { | |
c0e41338 | 654 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 655 | int status = lksb->lksb_fsdlm.sb_status; |
cf4d8d75 | 656 | |
cf4d8d75 DT |
657 | /* |
658 | * For now we're punting on the issue of other non-standard errors | |
659 | * where we can't tell if the unlock_ast or lock_ast should be called. | |
660 | * The main "other error" that's possible is EINVAL which means the | |
661 | * function was called with invalid args, which shouldn't be possible | |
662 | * since the caller here is under our control. Other non-standard | |
663 | * errors probably fall into the same category, or otherwise are fatal | |
664 | * which means we can't carry on anyway. | |
665 | */ | |
666 | ||
667 | if (status == -DLM_EUNLOCK || status == -DLM_ECANCEL) | |
110946c8 | 668 | lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, 0); |
cf4d8d75 | 669 | else |
110946c8 | 670 | lksb->lksb_conn->cc_proto->lp_lock_ast(lksb); |
cf4d8d75 DT |
671 | } |
672 | ||
673 | static void fsdlm_blocking_ast_wrapper(void *astarg, int level) | |
674 | { | |
c0e41338 | 675 | struct ocfs2_dlm_lksb *lksb = astarg; |
a796d286 | 676 | |
110946c8 | 677 | lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level); |
cf4d8d75 DT |
678 | } |
679 | ||
680 | static int user_dlm_lock(struct ocfs2_cluster_connection *conn, | |
681 | int mode, | |
c0e41338 | 682 | struct ocfs2_dlm_lksb *lksb, |
cf4d8d75 DT |
683 | u32 flags, |
684 | void *name, | |
a796d286 | 685 | unsigned int namelen) |
cf4d8d75 | 686 | { |
cf4d8d75 DT |
687 | if (!lksb->lksb_fsdlm.sb_lvbptr) |
688 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + | |
689 | sizeof(struct dlm_lksb); | |
690 | ||
38c9d2d3 JQ |
691 | return dlm_lock(conn->cc_lockspace, mode, &lksb->lksb_fsdlm, |
692 | flags|DLM_LKF_NODLCKWT, name, namelen, 0, | |
693 | fsdlm_lock_ast_wrapper, lksb, | |
694 | fsdlm_blocking_ast_wrapper); | |
cf4d8d75 DT |
695 | } |
696 | ||
697 | static int user_dlm_unlock(struct ocfs2_cluster_connection *conn, | |
c0e41338 | 698 | struct ocfs2_dlm_lksb *lksb, |
a796d286 | 699 | u32 flags) |
cf4d8d75 | 700 | { |
38c9d2d3 JQ |
701 | return dlm_unlock(conn->cc_lockspace, lksb->lksb_fsdlm.sb_lkid, |
702 | flags, &lksb->lksb_fsdlm, lksb); | |
cf4d8d75 DT |
703 | } |
704 | ||
c0e41338 | 705 | static int user_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 DT |
706 | { |
707 | return lksb->lksb_fsdlm.sb_status; | |
708 | } | |
709 | ||
c0e41338 | 710 | static int user_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
1c520dfb JB |
711 | { |
712 | int invalid = lksb->lksb_fsdlm.sb_flags & DLM_SBF_VALNOTVALID; | |
713 | ||
714 | return !invalid; | |
715 | } | |
716 | ||
c0e41338 | 717 | static void *user_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 | 718 | { |
66f502a4 DT |
719 | if (!lksb->lksb_fsdlm.sb_lvbptr) |
720 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + | |
721 | sizeof(struct dlm_lksb); | |
cf4d8d75 DT |
722 | return (void *)(lksb->lksb_fsdlm.sb_lvbptr); |
723 | } | |
724 | ||
c0e41338 | 725 | static void user_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
cf4d8d75 DT |
726 | { |
727 | } | |
728 | ||
53da4939 MF |
729 | static int user_plock(struct ocfs2_cluster_connection *conn, |
730 | u64 ino, | |
731 | struct file *file, | |
732 | int cmd, | |
733 | struct file_lock *fl) | |
734 | { | |
735 | /* | |
736 | * This more or less just demuxes the plock request into any | |
737 | * one of three dlm calls. | |
738 | * | |
739 | * Internally, fs/dlm will pass these to a misc device, which | |
740 | * a userspace daemon will read and write to. | |
53da4939 MF |
741 | */ |
742 | ||
dc52cd2e AA |
743 | if (cmd == F_CANCELLK) |
744 | return dlm_posix_cancel(conn->cc_lockspace, ino, file, fl); | |
745 | else if (IS_GETLK(cmd)) | |
53da4939 | 746 | return dlm_posix_get(conn->cc_lockspace, ino, file, fl); |
64f92a55 | 747 | else if (lock_is_unlock(fl)) |
53da4939 MF |
748 | return dlm_posix_unlock(conn->cc_lockspace, ino, file, fl); |
749 | else | |
750 | return dlm_posix_lock(conn->cc_lockspace, ino, file, cmd, fl); | |
751 | } | |
752 | ||
cf4d8d75 DT |
753 | /* |
754 | * Compare a requested locking protocol version against the current one. | |
755 | * | |
756 | * If the major numbers are different, they are incompatible. | |
757 | * If the current minor is greater than the request, they are incompatible. | |
758 | * If the current minor is less than or equal to the request, they are | |
759 | * compatible, and the requester should run at the current minor version. | |
760 | */ | |
761 | static int fs_protocol_compare(struct ocfs2_protocol_version *existing, | |
762 | struct ocfs2_protocol_version *request) | |
763 | { | |
764 | if (existing->pv_major != request->pv_major) | |
765 | return 1; | |
766 | ||
767 | if (existing->pv_minor > request->pv_minor) | |
768 | return 1; | |
769 | ||
770 | if (existing->pv_minor < request->pv_minor) | |
771 | request->pv_minor = existing->pv_minor; | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
41503630 GR |
776 | static void lvb_to_version(char *lvb, struct ocfs2_protocol_version *ver) |
777 | { | |
778 | struct ocfs2_protocol_version *pv = | |
779 | (struct ocfs2_protocol_version *)lvb; | |
780 | /* | |
781 | * ocfs2_protocol_version has two u8 variables, so we don't | |
782 | * need any endian conversion. | |
783 | */ | |
784 | ver->pv_major = pv->pv_major; | |
785 | ver->pv_minor = pv->pv_minor; | |
786 | } | |
787 | ||
788 | static void version_to_lvb(struct ocfs2_protocol_version *ver, char *lvb) | |
789 | { | |
790 | struct ocfs2_protocol_version *pv = | |
791 | (struct ocfs2_protocol_version *)lvb; | |
792 | /* | |
793 | * ocfs2_protocol_version has two u8 variables, so we don't | |
794 | * need any endian conversion. | |
795 | */ | |
796 | pv->pv_major = ver->pv_major; | |
797 | pv->pv_minor = ver->pv_minor; | |
798 | } | |
799 | ||
800 | static void sync_wait_cb(void *arg) | |
801 | { | |
802 | struct ocfs2_cluster_connection *conn = arg; | |
803 | struct ocfs2_live_connection *lc = conn->cc_private; | |
804 | complete(&lc->oc_sync_wait); | |
805 | } | |
806 | ||
807 | static int sync_unlock(struct ocfs2_cluster_connection *conn, | |
808 | struct dlm_lksb *lksb, char *name) | |
809 | { | |
810 | int error; | |
811 | struct ocfs2_live_connection *lc = conn->cc_private; | |
812 | ||
813 | error = dlm_unlock(conn->cc_lockspace, lksb->sb_lkid, 0, lksb, conn); | |
814 | if (error) { | |
815 | printk(KERN_ERR "%s lkid %x error %d\n", | |
816 | name, lksb->sb_lkid, error); | |
817 | return error; | |
818 | } | |
819 | ||
820 | wait_for_completion(&lc->oc_sync_wait); | |
821 | ||
822 | if (lksb->sb_status != -DLM_EUNLOCK) { | |
823 | printk(KERN_ERR "%s lkid %x status %d\n", | |
824 | name, lksb->sb_lkid, lksb->sb_status); | |
825 | return -1; | |
826 | } | |
827 | return 0; | |
828 | } | |
829 | ||
830 | static int sync_lock(struct ocfs2_cluster_connection *conn, | |
831 | int mode, uint32_t flags, | |
832 | struct dlm_lksb *lksb, char *name) | |
833 | { | |
834 | int error, status; | |
835 | struct ocfs2_live_connection *lc = conn->cc_private; | |
836 | ||
837 | error = dlm_lock(conn->cc_lockspace, mode, lksb, flags, | |
838 | name, strlen(name), | |
839 | 0, sync_wait_cb, conn, NULL); | |
840 | if (error) { | |
841 | printk(KERN_ERR "%s lkid %x flags %x mode %d error %d\n", | |
842 | name, lksb->sb_lkid, flags, mode, error); | |
843 | return error; | |
844 | } | |
845 | ||
846 | wait_for_completion(&lc->oc_sync_wait); | |
847 | ||
848 | status = lksb->sb_status; | |
849 | ||
850 | if (status && status != -EAGAIN) { | |
851 | printk(KERN_ERR "%s lkid %x flags %x mode %d status %d\n", | |
852 | name, lksb->sb_lkid, flags, mode, status); | |
853 | } | |
854 | ||
855 | return status; | |
856 | } | |
857 | ||
858 | ||
859 | static int version_lock(struct ocfs2_cluster_connection *conn, int mode, | |
860 | int flags) | |
861 | { | |
862 | struct ocfs2_live_connection *lc = conn->cc_private; | |
863 | return sync_lock(conn, mode, flags, | |
864 | &lc->oc_version_lksb, VERSION_LOCK); | |
865 | } | |
866 | ||
867 | static int version_unlock(struct ocfs2_cluster_connection *conn) | |
868 | { | |
869 | struct ocfs2_live_connection *lc = conn->cc_private; | |
870 | return sync_unlock(conn, &lc->oc_version_lksb, VERSION_LOCK); | |
871 | } | |
872 | ||
c994c2eb GR |
873 | /* get_protocol_version() |
874 | * | |
875 | * To exchange ocfs2 versioning, we use the LVB of the version dlm lock. | |
876 | * The algorithm is: | |
877 | * 1. Attempt to take the lock in EX mode (non-blocking). | |
878 | * 2. If successful (which means it is the first mount), write the | |
879 | * version number and downconvert to PR lock. | |
880 | * 3. If unsuccessful (returns -EAGAIN), read the version from the LVB after | |
881 | * taking the PR lock. | |
882 | */ | |
883 | ||
884 | static int get_protocol_version(struct ocfs2_cluster_connection *conn) | |
885 | { | |
886 | int ret; | |
887 | struct ocfs2_live_connection *lc = conn->cc_private; | |
888 | struct ocfs2_protocol_version pv; | |
889 | ||
890 | running_proto.pv_major = | |
891 | ocfs2_user_plugin.sp_max_proto.pv_major; | |
892 | running_proto.pv_minor = | |
893 | ocfs2_user_plugin.sp_max_proto.pv_minor; | |
894 | ||
895 | lc->oc_version_lksb.sb_lvbptr = lc->oc_lvb; | |
896 | ret = version_lock(conn, DLM_LOCK_EX, | |
897 | DLM_LKF_VALBLK|DLM_LKF_NOQUEUE); | |
898 | if (!ret) { | |
899 | conn->cc_version.pv_major = running_proto.pv_major; | |
900 | conn->cc_version.pv_minor = running_proto.pv_minor; | |
901 | version_to_lvb(&running_proto, lc->oc_lvb); | |
902 | version_lock(conn, DLM_LOCK_PR, DLM_LKF_CONVERT|DLM_LKF_VALBLK); | |
903 | } else if (ret == -EAGAIN) { | |
904 | ret = version_lock(conn, DLM_LOCK_PR, DLM_LKF_VALBLK); | |
905 | if (ret) | |
906 | goto out; | |
907 | lvb_to_version(lc->oc_lvb, &pv); | |
908 | ||
909 | if ((pv.pv_major != running_proto.pv_major) || | |
910 | (pv.pv_minor > running_proto.pv_minor)) { | |
911 | ret = -EINVAL; | |
912 | goto out; | |
913 | } | |
914 | ||
915 | conn->cc_version.pv_major = pv.pv_major; | |
916 | conn->cc_version.pv_minor = pv.pv_minor; | |
917 | } | |
918 | out: | |
919 | return ret; | |
920 | } | |
921 | ||
66e188fc GR |
922 | static void user_recover_prep(void *arg) |
923 | { | |
924 | } | |
925 | ||
926 | static void user_recover_slot(void *arg, struct dlm_slot *slot) | |
927 | { | |
928 | struct ocfs2_cluster_connection *conn = arg; | |
929 | printk(KERN_INFO "ocfs2: Node %d/%d down. Initiating recovery.\n", | |
930 | slot->nodeid, slot->slot); | |
931 | conn->cc_recovery_handler(slot->nodeid, conn->cc_recovery_data); | |
932 | ||
933 | } | |
934 | ||
935 | static void user_recover_done(void *arg, struct dlm_slot *slots, | |
936 | int num_slots, int our_slot, | |
937 | uint32_t generation) | |
938 | { | |
939 | struct ocfs2_cluster_connection *conn = arg; | |
940 | struct ocfs2_live_connection *lc = conn->cc_private; | |
941 | int i; | |
942 | ||
943 | for (i = 0; i < num_slots; i++) | |
944 | if (slots[i].slot == our_slot) { | |
945 | atomic_set(&lc->oc_this_node, slots[i].nodeid); | |
946 | break; | |
947 | } | |
948 | ||
949 | lc->oc_our_slot = our_slot; | |
c994c2eb | 950 | wake_up(&lc->oc_wait); |
66e188fc GR |
951 | } |
952 | ||
16eac4be | 953 | static const struct dlm_lockspace_ops ocfs2_ls_ops = { |
66e188fc GR |
954 | .recover_prep = user_recover_prep, |
955 | .recover_slot = user_recover_slot, | |
956 | .recover_done = user_recover_done, | |
957 | }; | |
958 | ||
c994c2eb GR |
959 | static int user_cluster_disconnect(struct ocfs2_cluster_connection *conn) |
960 | { | |
961 | version_unlock(conn); | |
962 | dlm_release_lockspace(conn->cc_lockspace, 2); | |
963 | conn->cc_lockspace = NULL; | |
964 | ocfs2_live_connection_drop(conn->cc_private); | |
965 | conn->cc_private = NULL; | |
966 | return 0; | |
967 | } | |
968 | ||
cf4d8d75 DT |
969 | static int user_cluster_connect(struct ocfs2_cluster_connection *conn) |
970 | { | |
971 | dlm_lockspace_t *fsdlm; | |
24aa3386 | 972 | struct ocfs2_live_connection *lc; |
c994c2eb | 973 | int rc, ops_rv; |
cf4d8d75 DT |
974 | |
975 | BUG_ON(conn == NULL); | |
976 | ||
24aa3386 | 977 | lc = kzalloc(sizeof(struct ocfs2_live_connection), GFP_KERNEL); |
43ee9cad ME |
978 | if (!lc) |
979 | return -ENOMEM; | |
24aa3386 | 980 | |
c994c2eb GR |
981 | init_waitqueue_head(&lc->oc_wait); |
982 | init_completion(&lc->oc_sync_wait); | |
983 | atomic_set(&lc->oc_this_node, 0); | |
984 | conn->cc_private = lc; | |
985 | lc->oc_type = NO_CONTROLD; | |
986 | ||
987 | rc = dlm_new_lockspace(conn->cc_name, conn->cc_cluster_name, | |
12cda13c | 988 | DLM_LSFL_NEWEXCL, DLM_LVB_LEN, |
c994c2eb | 989 | &ocfs2_ls_ops, conn, &ops_rv, &fsdlm); |
01a36b67 GH |
990 | if (rc) { |
991 | if (rc == -EEXIST || rc == -EPROTO) | |
992 | printk(KERN_ERR "ocfs2: Unable to create the " | |
993 | "lockspace %s (%d), because a ocfs2-tools " | |
994 | "program is running on this file system " | |
995 | "with the same name lockspace\n", | |
996 | conn->cc_name, rc); | |
c994c2eb | 997 | goto out; |
01a36b67 | 998 | } |
c994c2eb GR |
999 | |
1000 | if (ops_rv == -EOPNOTSUPP) { | |
1001 | lc->oc_type = WITH_CONTROLD; | |
1002 | printk(KERN_NOTICE "ocfs2: You seem to be using an older " | |
1003 | "version of dlm_controld and/or ocfs2-tools." | |
1004 | " Please consider upgrading.\n"); | |
1005 | } else if (ops_rv) { | |
1006 | rc = ops_rv; | |
1007 | goto out; | |
1008 | } | |
1009 | conn->cc_lockspace = fsdlm; | |
1010 | ||
24aa3386 | 1011 | rc = ocfs2_live_connection_attach(conn, lc); |
cf4d8d75 DT |
1012 | if (rc) |
1013 | goto out; | |
1014 | ||
c994c2eb GR |
1015 | if (lc->oc_type == NO_CONTROLD) { |
1016 | rc = get_protocol_version(conn); | |
1017 | if (rc) { | |
1018 | printk(KERN_ERR "ocfs2: Could not determine" | |
1019 | " locking version\n"); | |
1020 | user_cluster_disconnect(conn); | |
1021 | goto out; | |
1022 | } | |
1023 | wait_event(lc->oc_wait, (atomic_read(&lc->oc_this_node) > 0)); | |
1024 | } | |
1025 | ||
cf4d8d75 DT |
1026 | /* |
1027 | * running_proto must have been set before we allowed any mounts | |
1028 | * to proceed. | |
1029 | */ | |
1030 | if (fs_protocol_compare(&running_proto, &conn->cc_version)) { | |
1031 | printk(KERN_ERR | |
1032 | "Unable to mount with fs locking protocol version " | |
c994c2eb | 1033 | "%u.%u because negotiated protocol is %u.%u\n", |
cf4d8d75 DT |
1034 | conn->cc_version.pv_major, conn->cc_version.pv_minor, |
1035 | running_proto.pv_major, running_proto.pv_minor); | |
1036 | rc = -EPROTO; | |
24aa3386 GR |
1037 | ocfs2_live_connection_drop(lc); |
1038 | lc = NULL; | |
cf4d8d75 DT |
1039 | } |
1040 | ||
cf4d8d75 | 1041 | out: |
fd90d4df | 1042 | if (rc) |
24aa3386 | 1043 | kfree(lc); |
cf4d8d75 DT |
1044 | return rc; |
1045 | } | |
1046 | ||
cf4d8d75 | 1047 | |
3e834151 GR |
1048 | static int user_cluster_this_node(struct ocfs2_cluster_connection *conn, |
1049 | unsigned int *this_node) | |
cf4d8d75 DT |
1050 | { |
1051 | int rc; | |
3e834151 | 1052 | struct ocfs2_live_connection *lc = conn->cc_private; |
cf4d8d75 | 1053 | |
3e834151 GR |
1054 | if (lc->oc_type == WITH_CONTROLD) |
1055 | rc = ocfs2_control_get_this_node(); | |
c994c2eb GR |
1056 | else if (lc->oc_type == NO_CONTROLD) |
1057 | rc = atomic_read(&lc->oc_this_node); | |
3e834151 GR |
1058 | else |
1059 | rc = -EINVAL; | |
c994c2eb | 1060 | |
cf4d8d75 DT |
1061 | if (rc < 0) |
1062 | return rc; | |
1063 | ||
1064 | *this_node = rc; | |
1065 | return 0; | |
1066 | } | |
1067 | ||
a12630b1 | 1068 | static struct ocfs2_stack_operations ocfs2_user_plugin_ops = { |
cf4d8d75 DT |
1069 | .connect = user_cluster_connect, |
1070 | .disconnect = user_cluster_disconnect, | |
1071 | .this_node = user_cluster_this_node, | |
1072 | .dlm_lock = user_dlm_lock, | |
1073 | .dlm_unlock = user_dlm_unlock, | |
1074 | .lock_status = user_dlm_lock_status, | |
1c520dfb | 1075 | .lvb_valid = user_dlm_lvb_valid, |
cf4d8d75 | 1076 | .lock_lvb = user_dlm_lvb, |
53da4939 | 1077 | .plock = user_plock, |
cf4d8d75 DT |
1078 | .dump_lksb = user_dlm_dump_lksb, |
1079 | }; | |
1080 | ||
a12630b1 | 1081 | static struct ocfs2_stack_plugin ocfs2_user_plugin = { |
cf4d8d75 | 1082 | .sp_name = "user", |
a12630b1 | 1083 | .sp_ops = &ocfs2_user_plugin_ops, |
cf4d8d75 DT |
1084 | .sp_owner = THIS_MODULE, |
1085 | }; | |
1086 | ||
1087 | ||
a12630b1 | 1088 | static int __init ocfs2_user_plugin_init(void) |
6427a727 | 1089 | { |
cf4d8d75 DT |
1090 | int rc; |
1091 | ||
1092 | rc = ocfs2_control_init(); | |
1093 | if (!rc) { | |
a12630b1 | 1094 | rc = ocfs2_stack_glue_register(&ocfs2_user_plugin); |
cf4d8d75 DT |
1095 | if (rc) |
1096 | ocfs2_control_exit(); | |
1097 | } | |
1098 | ||
1099 | return rc; | |
6427a727 JB |
1100 | } |
1101 | ||
a12630b1 | 1102 | static void __exit ocfs2_user_plugin_exit(void) |
8adf0536 | 1103 | { |
a12630b1 | 1104 | ocfs2_stack_glue_unregister(&ocfs2_user_plugin); |
6427a727 | 1105 | ocfs2_control_exit(); |
8adf0536 JB |
1106 | } |
1107 | ||
1108 | MODULE_AUTHOR("Oracle"); | |
1109 | MODULE_DESCRIPTION("ocfs2 driver for userspace cluster stacks"); | |
1110 | MODULE_LICENSE("GPL"); | |
a12630b1 JB |
1111 | module_init(ocfs2_user_plugin_init); |
1112 | module_exit(ocfs2_user_plugin_exit); |