Commit | Line | Data |
---|---|---|
597d0cae | 1 | /* |
ef0c2bb0 | 2 | * Copyright (C) 2006-2007 Red Hat, Inc. All rights reserved. |
597d0cae DT |
3 | * |
4 | * This copyrighted material is made available to anyone wishing to use, | |
5 | * modify, copy, or redistribute it subject to the terms and conditions | |
6 | * of the GNU General Public License v.2. | |
7 | */ | |
8 | ||
9 | #include <linux/miscdevice.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/wait.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/file.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/poll.h> | |
16 | #include <linux/signal.h> | |
17 | #include <linux/spinlock.h> | |
18 | #include <linux/dlm.h> | |
19 | #include <linux/dlm_device.h> | |
20 | ||
21 | #include "dlm_internal.h" | |
22 | #include "lockspace.h" | |
23 | #include "lock.h" | |
24 | #include "lvb_table.h" | |
84c6e8cd | 25 | #include "user.h" |
597d0cae | 26 | |
0fe410d3 | 27 | static const char name_prefix[] = "dlm"; |
00977a59 | 28 | static const struct file_operations device_fops; |
597d0cae DT |
29 | |
30 | #ifdef CONFIG_COMPAT | |
31 | ||
32 | struct dlm_lock_params32 { | |
33 | __u8 mode; | |
34 | __u8 namelen; | |
d7db923e DT |
35 | __u16 unused; |
36 | __u32 flags; | |
597d0cae DT |
37 | __u32 lkid; |
38 | __u32 parent; | |
d7db923e DT |
39 | __u64 xid; |
40 | __u64 timeout; | |
597d0cae DT |
41 | __u32 castparam; |
42 | __u32 castaddr; | |
43 | __u32 bastparam; | |
44 | __u32 bastaddr; | |
45 | __u32 lksb; | |
597d0cae DT |
46 | char lvb[DLM_USER_LVB_LEN]; |
47 | char name[0]; | |
48 | }; | |
49 | ||
50 | struct dlm_write_request32 { | |
51 | __u32 version[3]; | |
52 | __u8 cmd; | |
53 | __u8 is64bit; | |
54 | __u8 unused[2]; | |
55 | ||
56 | union { | |
57 | struct dlm_lock_params32 lock; | |
58 | struct dlm_lspace_params lspace; | |
72c2be77 | 59 | struct dlm_purge_params purge; |
597d0cae DT |
60 | } i; |
61 | }; | |
62 | ||
63 | struct dlm_lksb32 { | |
64 | __u32 sb_status; | |
65 | __u32 sb_lkid; | |
66 | __u8 sb_flags; | |
67 | __u32 sb_lvbptr; | |
68 | }; | |
69 | ||
70 | struct dlm_lock_result32 { | |
d7db923e | 71 | __u32 version[3]; |
597d0cae DT |
72 | __u32 length; |
73 | __u32 user_astaddr; | |
74 | __u32 user_astparam; | |
75 | __u32 user_lksb; | |
76 | struct dlm_lksb32 lksb; | |
77 | __u8 bast_mode; | |
78 | __u8 unused[3]; | |
79 | /* Offsets may be zero if no data is present */ | |
80 | __u32 lvb_offset; | |
81 | }; | |
82 | ||
83 | static void compat_input(struct dlm_write_request *kb, | |
2a79289e | 84 | struct dlm_write_request32 *kb32, |
cb79f199 | 85 | size_t count) |
597d0cae DT |
86 | { |
87 | kb->version[0] = kb32->version[0]; | |
88 | kb->version[1] = kb32->version[1]; | |
89 | kb->version[2] = kb32->version[2]; | |
90 | ||
91 | kb->cmd = kb32->cmd; | |
92 | kb->is64bit = kb32->is64bit; | |
93 | if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || | |
94 | kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { | |
95 | kb->i.lspace.flags = kb32->i.lspace.flags; | |
96 | kb->i.lspace.minor = kb32->i.lspace.minor; | |
cb79f199 AV |
97 | memcpy(kb->i.lspace.name, kb32->i.lspace.name, count - |
98 | offsetof(struct dlm_write_request32, i.lspace.name)); | |
72c2be77 DT |
99 | } else if (kb->cmd == DLM_USER_PURGE) { |
100 | kb->i.purge.nodeid = kb32->i.purge.nodeid; | |
101 | kb->i.purge.pid = kb32->i.purge.pid; | |
597d0cae DT |
102 | } else { |
103 | kb->i.lock.mode = kb32->i.lock.mode; | |
104 | kb->i.lock.namelen = kb32->i.lock.namelen; | |
105 | kb->i.lock.flags = kb32->i.lock.flags; | |
106 | kb->i.lock.lkid = kb32->i.lock.lkid; | |
107 | kb->i.lock.parent = kb32->i.lock.parent; | |
d7db923e DT |
108 | kb->i.lock.xid = kb32->i.lock.xid; |
109 | kb->i.lock.timeout = kb32->i.lock.timeout; | |
597d0cae DT |
110 | kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; |
111 | kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; | |
112 | kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; | |
113 | kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; | |
114 | kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; | |
115 | memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); | |
cb79f199 AV |
116 | memcpy(kb->i.lock.name, kb32->i.lock.name, count - |
117 | offsetof(struct dlm_write_request32, i.lock.name)); | |
597d0cae DT |
118 | } |
119 | } | |
120 | ||
121 | static void compat_output(struct dlm_lock_result *res, | |
122 | struct dlm_lock_result32 *res32) | |
123 | { | |
d7db923e DT |
124 | res32->version[0] = res->version[0]; |
125 | res32->version[1] = res->version[1]; | |
126 | res32->version[2] = res->version[2]; | |
127 | ||
597d0cae DT |
128 | res32->user_astaddr = (__u32)(long)res->user_astaddr; |
129 | res32->user_astparam = (__u32)(long)res->user_astparam; | |
130 | res32->user_lksb = (__u32)(long)res->user_lksb; | |
131 | res32->bast_mode = res->bast_mode; | |
132 | ||
133 | res32->lvb_offset = res->lvb_offset; | |
134 | res32->length = res->length; | |
135 | ||
136 | res32->lksb.sb_status = res->lksb.sb_status; | |
137 | res32->lksb.sb_flags = res->lksb.sb_flags; | |
138 | res32->lksb.sb_lkid = res->lksb.sb_lkid; | |
139 | res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; | |
140 | } | |
141 | #endif | |
142 | ||
84d8cd69 DT |
143 | /* Figure out if this lock is at the end of its life and no longer |
144 | available for the application to use. The lkb still exists until | |
145 | the final ast is read. A lock becomes EOL in three situations: | |
146 | 1. a noqueue request fails with EAGAIN | |
147 | 2. an unlock completes with EUNLOCK | |
148 | 3. a cancel of a waiting request completes with ECANCEL/EDEADLK | |
149 | An EOL lock needs to be removed from the process's list of locks. | |
150 | And we can't allow any new operation on an EOL lock. This is | |
151 | not related to the lifetime of the lkb struct which is managed | |
152 | entirely by refcount. */ | |
153 | ||
154 | static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) | |
155 | { | |
156 | switch (sb_status) { | |
157 | case -DLM_EUNLOCK: | |
158 | return 1; | |
159 | case -DLM_ECANCEL: | |
160 | case -ETIMEDOUT: | |
8b4021fa | 161 | case -EDEADLK: |
84d8cd69 DT |
162 | if (lkb->lkb_grmode == DLM_LOCK_IV) |
163 | return 1; | |
164 | break; | |
165 | case -EAGAIN: | |
166 | if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV) | |
167 | return 1; | |
168 | break; | |
169 | } | |
170 | return 0; | |
171 | } | |
172 | ||
ef0c2bb0 DT |
173 | /* we could possibly check if the cancel of an orphan has resulted in the lkb |
174 | being removed and then remove that lkb from the orphans list and free it */ | |
597d0cae DT |
175 | |
176 | void dlm_user_add_ast(struct dlm_lkb *lkb, int type) | |
177 | { | |
178 | struct dlm_ls *ls; | |
179 | struct dlm_user_args *ua; | |
180 | struct dlm_user_proc *proc; | |
ef0c2bb0 | 181 | int eol = 0, ast_type; |
597d0cae | 182 | |
ef0c2bb0 | 183 | if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) |
597d0cae | 184 | return; |
597d0cae DT |
185 | |
186 | ls = lkb->lkb_resource->res_ls; | |
187 | mutex_lock(&ls->ls_clear_proc_locks); | |
188 | ||
189 | /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast | |
190 | can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed | |
ef0c2bb0 DT |
191 | lkb->ua so we can't try to use it. This second check is necessary |
192 | for cases where a completion ast is received for an operation that | |
193 | began before clear_proc_locks did its cancel/unlock. */ | |
597d0cae | 194 | |
ef0c2bb0 | 195 | if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) |
597d0cae | 196 | goto out; |
597d0cae DT |
197 | |
198 | DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb);); | |
199 | ua = (struct dlm_user_args *)lkb->lkb_astparam; | |
200 | proc = ua->proc; | |
201 | ||
202 | if (type == AST_BAST && ua->bastaddr == NULL) | |
203 | goto out; | |
204 | ||
205 | spin_lock(&proc->asts_spin); | |
ef0c2bb0 DT |
206 | |
207 | ast_type = lkb->lkb_ast_type; | |
208 | lkb->lkb_ast_type |= type; | |
209 | ||
210 | if (!ast_type) { | |
597d0cae DT |
211 | kref_get(&lkb->lkb_ref); |
212 | list_add_tail(&lkb->lkb_astqueue, &proc->asts); | |
597d0cae DT |
213 | wake_up_interruptible(&proc->wait); |
214 | } | |
ef0c2bb0 DT |
215 | if (type == AST_COMP && (ast_type & AST_COMP)) |
216 | log_debug(ls, "ast overlap %x status %x %x", | |
217 | lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags); | |
218 | ||
84d8cd69 | 219 | eol = lkb_is_endoflife(lkb, ua->lksb.sb_status, type); |
ef0c2bb0 DT |
220 | if (eol) { |
221 | lkb->lkb_ast_type &= ~AST_BAST; | |
222 | lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; | |
223 | } | |
a1bc86e6 | 224 | |
597d0cae DT |
225 | /* We want to copy the lvb to userspace when the completion |
226 | ast is read if the status is 0, the lock has an lvb and | |
227 | lvb_ops says we should. We could probably have set_lvb_lock() | |
228 | set update_user_lvb instead and not need old_mode */ | |
229 | ||
230 | if ((lkb->lkb_ast_type & AST_COMP) && | |
231 | (lkb->lkb_lksb->sb_status == 0) && | |
232 | lkb->lkb_lksb->sb_lvbptr && | |
233 | dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) | |
234 | ua->update_user_lvb = 1; | |
235 | else | |
236 | ua->update_user_lvb = 0; | |
237 | ||
238 | spin_unlock(&proc->asts_spin); | |
34e22bed | 239 | |
ef0c2bb0 | 240 | if (eol) { |
ce5246b9 | 241 | spin_lock(&proc->locks_spin); |
ef0c2bb0 DT |
242 | if (!list_empty(&lkb->lkb_ownqueue)) { |
243 | list_del_init(&lkb->lkb_ownqueue); | |
244 | dlm_put_lkb(lkb); | |
245 | } | |
ce5246b9 | 246 | spin_unlock(&proc->locks_spin); |
34e22bed | 247 | } |
597d0cae DT |
248 | out: |
249 | mutex_unlock(&ls->ls_clear_proc_locks); | |
250 | } | |
251 | ||
252 | static int device_user_lock(struct dlm_user_proc *proc, | |
253 | struct dlm_lock_params *params) | |
254 | { | |
255 | struct dlm_ls *ls; | |
256 | struct dlm_user_args *ua; | |
257 | int error = -ENOMEM; | |
258 | ||
259 | ls = dlm_find_lockspace_local(proc->lockspace); | |
260 | if (!ls) | |
261 | return -ENOENT; | |
262 | ||
263 | if (!params->castaddr || !params->lksb) { | |
264 | error = -EINVAL; | |
265 | goto out; | |
266 | } | |
267 | ||
268 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); | |
269 | if (!ua) | |
270 | goto out; | |
271 | ua->proc = proc; | |
272 | ua->user_lksb = params->lksb; | |
273 | ua->castparam = params->castparam; | |
274 | ua->castaddr = params->castaddr; | |
275 | ua->bastparam = params->bastparam; | |
276 | ua->bastaddr = params->bastaddr; | |
d7db923e | 277 | ua->xid = params->xid; |
597d0cae DT |
278 | |
279 | if (params->flags & DLM_LKF_CONVERT) | |
280 | error = dlm_user_convert(ls, ua, | |
281 | params->mode, params->flags, | |
d7db923e DT |
282 | params->lkid, params->lvb, |
283 | (unsigned long) params->timeout); | |
597d0cae DT |
284 | else { |
285 | error = dlm_user_request(ls, ua, | |
286 | params->mode, params->flags, | |
287 | params->name, params->namelen, | |
d7db923e | 288 | (unsigned long) params->timeout); |
597d0cae DT |
289 | if (!error) |
290 | error = ua->lksb.sb_lkid; | |
291 | } | |
292 | out: | |
293 | dlm_put_lockspace(ls); | |
294 | return error; | |
295 | } | |
296 | ||
297 | static int device_user_unlock(struct dlm_user_proc *proc, | |
298 | struct dlm_lock_params *params) | |
299 | { | |
300 | struct dlm_ls *ls; | |
301 | struct dlm_user_args *ua; | |
302 | int error = -ENOMEM; | |
303 | ||
304 | ls = dlm_find_lockspace_local(proc->lockspace); | |
305 | if (!ls) | |
306 | return -ENOENT; | |
307 | ||
308 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); | |
309 | if (!ua) | |
310 | goto out; | |
311 | ua->proc = proc; | |
312 | ua->user_lksb = params->lksb; | |
313 | ua->castparam = params->castparam; | |
314 | ua->castaddr = params->castaddr; | |
315 | ||
316 | if (params->flags & DLM_LKF_CANCEL) | |
317 | error = dlm_user_cancel(ls, ua, params->flags, params->lkid); | |
318 | else | |
319 | error = dlm_user_unlock(ls, ua, params->flags, params->lkid, | |
320 | params->lvb); | |
321 | out: | |
322 | dlm_put_lockspace(ls); | |
323 | return error; | |
324 | } | |
325 | ||
8b4021fa DT |
326 | static int device_user_deadlock(struct dlm_user_proc *proc, |
327 | struct dlm_lock_params *params) | |
328 | { | |
329 | struct dlm_ls *ls; | |
330 | int error; | |
331 | ||
332 | ls = dlm_find_lockspace_local(proc->lockspace); | |
333 | if (!ls) | |
334 | return -ENOENT; | |
335 | ||
336 | error = dlm_user_deadlock(ls, params->flags, params->lkid); | |
337 | ||
338 | dlm_put_lockspace(ls); | |
339 | return error; | |
340 | } | |
341 | ||
254da030 PC |
342 | static int create_misc_device(struct dlm_ls *ls, char *name) |
343 | { | |
344 | int error, len; | |
345 | ||
346 | error = -ENOMEM; | |
347 | len = strlen(name) + strlen(name_prefix) + 2; | |
348 | ls->ls_device.name = kzalloc(len, GFP_KERNEL); | |
349 | if (!ls->ls_device.name) | |
350 | goto fail; | |
351 | ||
352 | snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, | |
353 | name); | |
354 | ls->ls_device.fops = &device_fops; | |
355 | ls->ls_device.minor = MISC_DYNAMIC_MINOR; | |
356 | ||
357 | error = misc_register(&ls->ls_device); | |
358 | if (error) { | |
359 | kfree(ls->ls_device.name); | |
360 | } | |
361 | fail: | |
362 | return error; | |
363 | } | |
364 | ||
72c2be77 DT |
365 | static int device_user_purge(struct dlm_user_proc *proc, |
366 | struct dlm_purge_params *params) | |
367 | { | |
368 | struct dlm_ls *ls; | |
369 | int error; | |
370 | ||
371 | ls = dlm_find_lockspace_local(proc->lockspace); | |
372 | if (!ls) | |
373 | return -ENOENT; | |
374 | ||
375 | error = dlm_user_purge(ls, proc, params->nodeid, params->pid); | |
376 | ||
377 | dlm_put_lockspace(ls); | |
378 | return error; | |
379 | } | |
380 | ||
597d0cae DT |
381 | static int device_create_lockspace(struct dlm_lspace_params *params) |
382 | { | |
383 | dlm_lockspace_t *lockspace; | |
384 | struct dlm_ls *ls; | |
254da030 | 385 | int error; |
597d0cae DT |
386 | |
387 | if (!capable(CAP_SYS_ADMIN)) | |
388 | return -EPERM; | |
389 | ||
390 | error = dlm_new_lockspace(params->name, strlen(params->name), | |
3ae1acf9 | 391 | &lockspace, params->flags, DLM_USER_LVB_LEN); |
597d0cae DT |
392 | if (error) |
393 | return error; | |
394 | ||
395 | ls = dlm_find_lockspace_local(lockspace); | |
396 | if (!ls) | |
397 | return -ENOENT; | |
398 | ||
254da030 | 399 | error = create_misc_device(ls, params->name); |
597d0cae | 400 | dlm_put_lockspace(ls); |
597d0cae | 401 | |
254da030 PC |
402 | if (error) |
403 | dlm_release_lockspace(lockspace, 0); | |
404 | else | |
405 | error = ls->ls_device.minor; | |
406 | ||
597d0cae DT |
407 | return error; |
408 | } | |
409 | ||
410 | static int device_remove_lockspace(struct dlm_lspace_params *params) | |
411 | { | |
412 | dlm_lockspace_t *lockspace; | |
413 | struct dlm_ls *ls; | |
c6e6f0ba | 414 | int error, force = 0; |
597d0cae DT |
415 | |
416 | if (!capable(CAP_SYS_ADMIN)) | |
417 | return -EPERM; | |
418 | ||
419 | ls = dlm_find_lockspace_device(params->minor); | |
420 | if (!ls) | |
421 | return -ENOENT; | |
422 | ||
254da030 PC |
423 | /* Deregister the misc device first, so we don't have |
424 | * a device that's not attached to a lockspace. If | |
425 | * dlm_release_lockspace fails then we can recreate it | |
426 | */ | |
597d0cae DT |
427 | error = misc_deregister(&ls->ls_device); |
428 | if (error) { | |
429 | dlm_put_lockspace(ls); | |
430 | goto out; | |
431 | } | |
432 | kfree(ls->ls_device.name); | |
433 | ||
c6e6f0ba DT |
434 | if (params->flags & DLM_USER_LSFLG_FORCEFREE) |
435 | force = 2; | |
436 | ||
597d0cae DT |
437 | lockspace = ls->ls_local_handle; |
438 | ||
439 | /* dlm_release_lockspace waits for references to go to zero, | |
440 | so all processes will need to close their device for the ls | |
441 | before the release will procede */ | |
442 | ||
443 | dlm_put_lockspace(ls); | |
c6e6f0ba | 444 | error = dlm_release_lockspace(lockspace, force); |
254da030 PC |
445 | if (error) |
446 | create_misc_device(ls, ls->ls_name); | |
c6e6f0ba | 447 | out: |
597d0cae DT |
448 | return error; |
449 | } | |
450 | ||
451 | /* Check the user's version matches ours */ | |
452 | static int check_version(struct dlm_write_request *req) | |
453 | { | |
454 | if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || | |
455 | (req->version[0] == DLM_DEVICE_VERSION_MAJOR && | |
456 | req->version[1] > DLM_DEVICE_VERSION_MINOR)) { | |
457 | ||
458 | printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " | |
459 | "user (%d.%d.%d) kernel (%d.%d.%d)\n", | |
460 | current->comm, | |
ba25f9dc | 461 | task_pid_nr(current), |
597d0cae DT |
462 | req->version[0], |
463 | req->version[1], | |
464 | req->version[2], | |
465 | DLM_DEVICE_VERSION_MAJOR, | |
466 | DLM_DEVICE_VERSION_MINOR, | |
467 | DLM_DEVICE_VERSION_PATCH); | |
468 | return -EINVAL; | |
469 | } | |
470 | return 0; | |
471 | } | |
472 | ||
473 | /* | |
474 | * device_write | |
475 | * | |
476 | * device_user_lock | |
477 | * dlm_user_request -> request_lock | |
478 | * dlm_user_convert -> convert_lock | |
479 | * | |
480 | * device_user_unlock | |
481 | * dlm_user_unlock -> unlock_lock | |
482 | * dlm_user_cancel -> cancel_lock | |
483 | * | |
484 | * device_create_lockspace | |
485 | * dlm_new_lockspace | |
486 | * | |
487 | * device_remove_lockspace | |
488 | * dlm_release_lockspace | |
489 | */ | |
490 | ||
491 | /* a write to a lockspace device is a lock or unlock request, a write | |
492 | to the control device is to create/remove a lockspace */ | |
493 | ||
494 | static ssize_t device_write(struct file *file, const char __user *buf, | |
495 | size_t count, loff_t *ppos) | |
496 | { | |
497 | struct dlm_user_proc *proc = file->private_data; | |
498 | struct dlm_write_request *kbuf; | |
499 | sigset_t tmpsig, allsigs; | |
500 | int error; | |
501 | ||
502 | #ifdef CONFIG_COMPAT | |
503 | if (count < sizeof(struct dlm_write_request32)) | |
504 | #else | |
505 | if (count < sizeof(struct dlm_write_request)) | |
506 | #endif | |
507 | return -EINVAL; | |
508 | ||
cb79f199 | 509 | kbuf = kzalloc(count + 1, GFP_KERNEL); |
597d0cae DT |
510 | if (!kbuf) |
511 | return -ENOMEM; | |
512 | ||
513 | if (copy_from_user(kbuf, buf, count)) { | |
514 | error = -EFAULT; | |
515 | goto out_free; | |
516 | } | |
517 | ||
518 | if (check_version(kbuf)) { | |
519 | error = -EBADE; | |
520 | goto out_free; | |
521 | } | |
522 | ||
523 | #ifdef CONFIG_COMPAT | |
524 | if (!kbuf->is64bit) { | |
525 | struct dlm_write_request32 *k32buf; | |
526 | k32buf = (struct dlm_write_request32 *)kbuf; | |
cb79f199 | 527 | kbuf = kmalloc(count + 1 + (sizeof(struct dlm_write_request) - |
597d0cae DT |
528 | sizeof(struct dlm_write_request32)), GFP_KERNEL); |
529 | if (!kbuf) | |
530 | return -ENOMEM; | |
531 | ||
532 | if (proc) | |
533 | set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); | |
cb79f199 | 534 | compat_input(kbuf, k32buf, count + 1); |
597d0cae DT |
535 | kfree(k32buf); |
536 | } | |
537 | #endif | |
538 | ||
539 | /* do we really need this? can a write happen after a close? */ | |
540 | if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && | |
541 | test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
542 | return -EINVAL; | |
543 | ||
544 | sigfillset(&allsigs); | |
545 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
546 | ||
547 | error = -EINVAL; | |
548 | ||
549 | switch (kbuf->cmd) | |
550 | { | |
551 | case DLM_USER_LOCK: | |
552 | if (!proc) { | |
553 | log_print("no locking on control device"); | |
554 | goto out_sig; | |
555 | } | |
556 | error = device_user_lock(proc, &kbuf->i.lock); | |
557 | break; | |
558 | ||
559 | case DLM_USER_UNLOCK: | |
560 | if (!proc) { | |
561 | log_print("no locking on control device"); | |
562 | goto out_sig; | |
563 | } | |
564 | error = device_user_unlock(proc, &kbuf->i.lock); | |
565 | break; | |
566 | ||
8b4021fa DT |
567 | case DLM_USER_DEADLOCK: |
568 | if (!proc) { | |
569 | log_print("no locking on control device"); | |
570 | goto out_sig; | |
571 | } | |
572 | error = device_user_deadlock(proc, &kbuf->i.lock); | |
573 | break; | |
574 | ||
597d0cae DT |
575 | case DLM_USER_CREATE_LOCKSPACE: |
576 | if (proc) { | |
577 | log_print("create/remove only on control device"); | |
578 | goto out_sig; | |
579 | } | |
580 | error = device_create_lockspace(&kbuf->i.lspace); | |
581 | break; | |
582 | ||
583 | case DLM_USER_REMOVE_LOCKSPACE: | |
584 | if (proc) { | |
585 | log_print("create/remove only on control device"); | |
586 | goto out_sig; | |
587 | } | |
588 | error = device_remove_lockspace(&kbuf->i.lspace); | |
589 | break; | |
590 | ||
72c2be77 DT |
591 | case DLM_USER_PURGE: |
592 | if (!proc) { | |
593 | log_print("no locking on control device"); | |
594 | goto out_sig; | |
595 | } | |
596 | error = device_user_purge(proc, &kbuf->i.purge); | |
597 | break; | |
598 | ||
597d0cae DT |
599 | default: |
600 | log_print("Unknown command passed to DLM device : %d\n", | |
601 | kbuf->cmd); | |
602 | } | |
603 | ||
604 | out_sig: | |
605 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
606 | recalc_sigpending(); | |
607 | out_free: | |
608 | kfree(kbuf); | |
609 | return error; | |
610 | } | |
611 | ||
612 | /* Every process that opens the lockspace device has its own "proc" structure | |
613 | hanging off the open file that's used to keep track of locks owned by the | |
614 | process and asts that need to be delivered to the process. */ | |
615 | ||
616 | static int device_open(struct inode *inode, struct file *file) | |
617 | { | |
618 | struct dlm_user_proc *proc; | |
619 | struct dlm_ls *ls; | |
620 | ||
621 | ls = dlm_find_lockspace_device(iminor(inode)); | |
622 | if (!ls) | |
623 | return -ENOENT; | |
624 | ||
625 | proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); | |
626 | if (!proc) { | |
627 | dlm_put_lockspace(ls); | |
628 | return -ENOMEM; | |
629 | } | |
630 | ||
631 | proc->lockspace = ls->ls_local_handle; | |
632 | INIT_LIST_HEAD(&proc->asts); | |
633 | INIT_LIST_HEAD(&proc->locks); | |
a1bc86e6 | 634 | INIT_LIST_HEAD(&proc->unlocking); |
597d0cae DT |
635 | spin_lock_init(&proc->asts_spin); |
636 | spin_lock_init(&proc->locks_spin); | |
637 | init_waitqueue_head(&proc->wait); | |
638 | file->private_data = proc; | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static int device_close(struct inode *inode, struct file *file) | |
644 | { | |
645 | struct dlm_user_proc *proc = file->private_data; | |
646 | struct dlm_ls *ls; | |
647 | sigset_t tmpsig, allsigs; | |
648 | ||
649 | ls = dlm_find_lockspace_local(proc->lockspace); | |
650 | if (!ls) | |
651 | return -ENOENT; | |
652 | ||
653 | sigfillset(&allsigs); | |
654 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
655 | ||
656 | set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); | |
657 | ||
658 | dlm_clear_proc_locks(ls, proc); | |
659 | ||
660 | /* at this point no more lkb's should exist for this lockspace, | |
661 | so there's no chance of dlm_user_add_ast() being called and | |
662 | looking for lkb->ua->proc */ | |
663 | ||
664 | kfree(proc); | |
665 | file->private_data = NULL; | |
666 | ||
667 | dlm_put_lockspace(ls); | |
668 | dlm_put_lockspace(ls); /* for the find in device_open() */ | |
669 | ||
670 | /* FIXME: AUTOFREE: if this ls is no longer used do | |
671 | device_remove_lockspace() */ | |
672 | ||
673 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
674 | recalc_sigpending(); | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, | |
680 | int bmode, char __user *buf, size_t count) | |
681 | { | |
682 | #ifdef CONFIG_COMPAT | |
683 | struct dlm_lock_result32 result32; | |
684 | #endif | |
685 | struct dlm_lock_result result; | |
686 | void *resultptr; | |
687 | int error=0; | |
688 | int len; | |
689 | int struct_len; | |
690 | ||
691 | memset(&result, 0, sizeof(struct dlm_lock_result)); | |
d7db923e DT |
692 | result.version[0] = DLM_DEVICE_VERSION_MAJOR; |
693 | result.version[1] = DLM_DEVICE_VERSION_MINOR; | |
694 | result.version[2] = DLM_DEVICE_VERSION_PATCH; | |
597d0cae DT |
695 | memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); |
696 | result.user_lksb = ua->user_lksb; | |
697 | ||
698 | /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated | |
699 | in a conversion unless the conversion is successful. See code | |
700 | in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, | |
701 | notes that a new blocking AST address and parameter are set even if | |
702 | the conversion fails, so maybe we should just do that. */ | |
703 | ||
704 | if (type == AST_BAST) { | |
705 | result.user_astaddr = ua->bastaddr; | |
706 | result.user_astparam = ua->bastparam; | |
707 | result.bast_mode = bmode; | |
708 | } else { | |
709 | result.user_astaddr = ua->castaddr; | |
710 | result.user_astparam = ua->castparam; | |
711 | } | |
712 | ||
713 | #ifdef CONFIG_COMPAT | |
714 | if (compat) | |
715 | len = sizeof(struct dlm_lock_result32); | |
716 | else | |
717 | #endif | |
718 | len = sizeof(struct dlm_lock_result); | |
719 | struct_len = len; | |
720 | ||
721 | /* copy lvb to userspace if there is one, it's been updated, and | |
722 | the user buffer has space for it */ | |
723 | ||
724 | if (ua->update_user_lvb && ua->lksb.sb_lvbptr && | |
725 | count >= len + DLM_USER_LVB_LEN) { | |
726 | if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, | |
727 | DLM_USER_LVB_LEN)) { | |
728 | error = -EFAULT; | |
729 | goto out; | |
730 | } | |
731 | ||
732 | result.lvb_offset = len; | |
733 | len += DLM_USER_LVB_LEN; | |
734 | } | |
735 | ||
736 | result.length = len; | |
737 | resultptr = &result; | |
738 | #ifdef CONFIG_COMPAT | |
739 | if (compat) { | |
740 | compat_output(&result, &result32); | |
741 | resultptr = &result32; | |
742 | } | |
743 | #endif | |
744 | ||
745 | if (copy_to_user(buf, resultptr, struct_len)) | |
746 | error = -EFAULT; | |
747 | else | |
748 | error = len; | |
749 | out: | |
750 | return error; | |
751 | } | |
752 | ||
d7db923e DT |
753 | static int copy_version_to_user(char __user *buf, size_t count) |
754 | { | |
755 | struct dlm_device_version ver; | |
756 | ||
757 | memset(&ver, 0, sizeof(struct dlm_device_version)); | |
758 | ver.version[0] = DLM_DEVICE_VERSION_MAJOR; | |
759 | ver.version[1] = DLM_DEVICE_VERSION_MINOR; | |
760 | ver.version[2] = DLM_DEVICE_VERSION_PATCH; | |
761 | ||
762 | if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) | |
763 | return -EFAULT; | |
764 | return sizeof(struct dlm_device_version); | |
765 | } | |
766 | ||
597d0cae DT |
767 | /* a read returns a single ast described in a struct dlm_lock_result */ |
768 | ||
769 | static ssize_t device_read(struct file *file, char __user *buf, size_t count, | |
770 | loff_t *ppos) | |
771 | { | |
772 | struct dlm_user_proc *proc = file->private_data; | |
773 | struct dlm_lkb *lkb; | |
774 | struct dlm_user_args *ua; | |
775 | DECLARE_WAITQUEUE(wait, current); | |
776 | int error, type=0, bmode=0, removed = 0; | |
777 | ||
d7db923e DT |
778 | if (count == sizeof(struct dlm_device_version)) { |
779 | error = copy_version_to_user(buf, count); | |
780 | return error; | |
781 | } | |
782 | ||
783 | if (!proc) { | |
784 | log_print("non-version read from control device %zu", count); | |
785 | return -EINVAL; | |
786 | } | |
787 | ||
597d0cae DT |
788 | #ifdef CONFIG_COMPAT |
789 | if (count < sizeof(struct dlm_lock_result32)) | |
790 | #else | |
791 | if (count < sizeof(struct dlm_lock_result)) | |
792 | #endif | |
793 | return -EINVAL; | |
794 | ||
795 | /* do we really need this? can a read happen after a close? */ | |
796 | if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
797 | return -EINVAL; | |
798 | ||
799 | spin_lock(&proc->asts_spin); | |
800 | if (list_empty(&proc->asts)) { | |
801 | if (file->f_flags & O_NONBLOCK) { | |
802 | spin_unlock(&proc->asts_spin); | |
803 | return -EAGAIN; | |
804 | } | |
805 | ||
806 | add_wait_queue(&proc->wait, &wait); | |
807 | ||
808 | repeat: | |
809 | set_current_state(TASK_INTERRUPTIBLE); | |
810 | if (list_empty(&proc->asts) && !signal_pending(current)) { | |
811 | spin_unlock(&proc->asts_spin); | |
812 | schedule(); | |
813 | spin_lock(&proc->asts_spin); | |
814 | goto repeat; | |
815 | } | |
816 | set_current_state(TASK_RUNNING); | |
817 | remove_wait_queue(&proc->wait, &wait); | |
818 | ||
819 | if (signal_pending(current)) { | |
820 | spin_unlock(&proc->asts_spin); | |
821 | return -ERESTARTSYS; | |
822 | } | |
823 | } | |
824 | ||
597d0cae DT |
825 | /* there may be both completion and blocking asts to return for |
826 | the lkb, don't remove lkb from asts list unless no asts remain */ | |
827 | ||
828 | lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); | |
829 | ||
830 | if (lkb->lkb_ast_type & AST_COMP) { | |
831 | lkb->lkb_ast_type &= ~AST_COMP; | |
832 | type = AST_COMP; | |
833 | } else if (lkb->lkb_ast_type & AST_BAST) { | |
834 | lkb->lkb_ast_type &= ~AST_BAST; | |
835 | type = AST_BAST; | |
836 | bmode = lkb->lkb_bastmode; | |
837 | } | |
838 | ||
839 | if (!lkb->lkb_ast_type) { | |
840 | list_del(&lkb->lkb_astqueue); | |
841 | removed = 1; | |
842 | } | |
843 | spin_unlock(&proc->asts_spin); | |
844 | ||
845 | ua = (struct dlm_user_args *)lkb->lkb_astparam; | |
846 | error = copy_result_to_user(ua, | |
847 | test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), | |
848 | type, bmode, buf, count); | |
849 | ||
850 | /* removes reference for the proc->asts lists added by | |
851 | dlm_user_add_ast() and may result in the lkb being freed */ | |
852 | if (removed) | |
853 | dlm_put_lkb(lkb); | |
854 | ||
855 | return error; | |
856 | } | |
857 | ||
858 | static unsigned int device_poll(struct file *file, poll_table *wait) | |
859 | { | |
860 | struct dlm_user_proc *proc = file->private_data; | |
861 | ||
862 | poll_wait(file, &proc->wait, wait); | |
863 | ||
864 | spin_lock(&proc->asts_spin); | |
865 | if (!list_empty(&proc->asts)) { | |
866 | spin_unlock(&proc->asts_spin); | |
867 | return POLLIN | POLLRDNORM; | |
868 | } | |
869 | spin_unlock(&proc->asts_spin); | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static int ctl_device_open(struct inode *inode, struct file *file) | |
874 | { | |
875 | file->private_data = NULL; | |
876 | return 0; | |
877 | } | |
878 | ||
879 | static int ctl_device_close(struct inode *inode, struct file *file) | |
880 | { | |
881 | return 0; | |
882 | } | |
883 | ||
00977a59 | 884 | static const struct file_operations device_fops = { |
597d0cae DT |
885 | .open = device_open, |
886 | .release = device_close, | |
887 | .read = device_read, | |
888 | .write = device_write, | |
889 | .poll = device_poll, | |
890 | .owner = THIS_MODULE, | |
891 | }; | |
892 | ||
00977a59 | 893 | static const struct file_operations ctl_device_fops = { |
597d0cae DT |
894 | .open = ctl_device_open, |
895 | .release = ctl_device_close, | |
d7db923e | 896 | .read = device_read, |
597d0cae DT |
897 | .write = device_write, |
898 | .owner = THIS_MODULE, | |
899 | }; | |
900 | ||
0fe410d3 DC |
901 | static struct miscdevice ctl_device = { |
902 | .name = "dlm-control", | |
903 | .fops = &ctl_device_fops, | |
904 | .minor = MISC_DYNAMIC_MINOR, | |
905 | }; | |
906 | ||
597d0cae DT |
907 | int dlm_user_init(void) |
908 | { | |
909 | int error; | |
910 | ||
597d0cae DT |
911 | error = misc_register(&ctl_device); |
912 | if (error) | |
913 | log_print("misc_register failed for control device"); | |
914 | ||
915 | return error; | |
916 | } | |
917 | ||
918 | void dlm_user_exit(void) | |
919 | { | |
920 | misc_deregister(&ctl_device); | |
921 | } | |
922 |