Commit | Line | Data |
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597d0cae DT |
1 | /* |
2 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
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 DT |
26 | |
27 | static const char *name_prefix="dlm"; | |
28 | static struct miscdevice ctl_device; | |
00977a59 | 29 | static const struct file_operations device_fops; |
597d0cae DT |
30 | |
31 | #ifdef CONFIG_COMPAT | |
32 | ||
33 | struct dlm_lock_params32 { | |
34 | __u8 mode; | |
35 | __u8 namelen; | |
36 | __u16 flags; | |
37 | __u32 lkid; | |
38 | __u32 parent; | |
39 | ||
40 | __u32 castparam; | |
41 | __u32 castaddr; | |
42 | __u32 bastparam; | |
43 | __u32 bastaddr; | |
44 | __u32 lksb; | |
45 | ||
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; | |
59 | } i; | |
60 | }; | |
61 | ||
62 | struct dlm_lksb32 { | |
63 | __u32 sb_status; | |
64 | __u32 sb_lkid; | |
65 | __u8 sb_flags; | |
66 | __u32 sb_lvbptr; | |
67 | }; | |
68 | ||
69 | struct dlm_lock_result32 { | |
70 | __u32 length; | |
71 | __u32 user_astaddr; | |
72 | __u32 user_astparam; | |
73 | __u32 user_lksb; | |
74 | struct dlm_lksb32 lksb; | |
75 | __u8 bast_mode; | |
76 | __u8 unused[3]; | |
77 | /* Offsets may be zero if no data is present */ | |
78 | __u32 lvb_offset; | |
79 | }; | |
80 | ||
81 | static void compat_input(struct dlm_write_request *kb, | |
82 | struct dlm_write_request32 *kb32) | |
83 | { | |
84 | kb->version[0] = kb32->version[0]; | |
85 | kb->version[1] = kb32->version[1]; | |
86 | kb->version[2] = kb32->version[2]; | |
87 | ||
88 | kb->cmd = kb32->cmd; | |
89 | kb->is64bit = kb32->is64bit; | |
90 | if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || | |
91 | kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { | |
92 | kb->i.lspace.flags = kb32->i.lspace.flags; | |
93 | kb->i.lspace.minor = kb32->i.lspace.minor; | |
94 | strcpy(kb->i.lspace.name, kb32->i.lspace.name); | |
95 | } else { | |
96 | kb->i.lock.mode = kb32->i.lock.mode; | |
97 | kb->i.lock.namelen = kb32->i.lock.namelen; | |
98 | kb->i.lock.flags = kb32->i.lock.flags; | |
99 | kb->i.lock.lkid = kb32->i.lock.lkid; | |
100 | kb->i.lock.parent = kb32->i.lock.parent; | |
101 | kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; | |
102 | kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; | |
103 | kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; | |
104 | kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; | |
105 | kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; | |
106 | memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); | |
107 | memcpy(kb->i.lock.name, kb32->i.lock.name, kb->i.lock.namelen); | |
108 | } | |
109 | } | |
110 | ||
111 | static void compat_output(struct dlm_lock_result *res, | |
112 | struct dlm_lock_result32 *res32) | |
113 | { | |
114 | res32->length = res->length - (sizeof(struct dlm_lock_result) - | |
115 | sizeof(struct dlm_lock_result32)); | |
116 | res32->user_astaddr = (__u32)(long)res->user_astaddr; | |
117 | res32->user_astparam = (__u32)(long)res->user_astparam; | |
118 | res32->user_lksb = (__u32)(long)res->user_lksb; | |
119 | res32->bast_mode = res->bast_mode; | |
120 | ||
121 | res32->lvb_offset = res->lvb_offset; | |
122 | res32->length = res->length; | |
123 | ||
124 | res32->lksb.sb_status = res->lksb.sb_status; | |
125 | res32->lksb.sb_flags = res->lksb.sb_flags; | |
126 | res32->lksb.sb_lkid = res->lksb.sb_lkid; | |
127 | res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; | |
128 | } | |
129 | #endif | |
130 | ||
131 | ||
132 | void dlm_user_add_ast(struct dlm_lkb *lkb, int type) | |
133 | { | |
134 | struct dlm_ls *ls; | |
135 | struct dlm_user_args *ua; | |
136 | struct dlm_user_proc *proc; | |
34e22bed | 137 | int remove_ownqueue = 0; |
597d0cae DT |
138 | |
139 | /* dlm_clear_proc_locks() sets ORPHAN/DEAD flag on each | |
140 | lkb before dealing with it. We need to check this | |
141 | flag before taking ls_clear_proc_locks mutex because if | |
142 | it's set, dlm_clear_proc_locks() holds the mutex. */ | |
143 | ||
144 | if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) { | |
145 | /* log_print("user_add_ast skip1 %x", lkb->lkb_flags); */ | |
146 | return; | |
147 | } | |
148 | ||
149 | ls = lkb->lkb_resource->res_ls; | |
150 | mutex_lock(&ls->ls_clear_proc_locks); | |
151 | ||
152 | /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast | |
153 | can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed | |
154 | lkb->ua so we can't try to use it. */ | |
155 | ||
156 | if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) { | |
157 | /* log_print("user_add_ast skip2 %x", lkb->lkb_flags); */ | |
158 | goto out; | |
159 | } | |
160 | ||
161 | DLM_ASSERT(lkb->lkb_astparam, dlm_print_lkb(lkb);); | |
162 | ua = (struct dlm_user_args *)lkb->lkb_astparam; | |
163 | proc = ua->proc; | |
164 | ||
165 | if (type == AST_BAST && ua->bastaddr == NULL) | |
166 | goto out; | |
167 | ||
168 | spin_lock(&proc->asts_spin); | |
169 | if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) { | |
170 | kref_get(&lkb->lkb_ref); | |
171 | list_add_tail(&lkb->lkb_astqueue, &proc->asts); | |
172 | lkb->lkb_ast_type |= type; | |
173 | wake_up_interruptible(&proc->wait); | |
174 | } | |
175 | ||
34e22bed DT |
176 | /* noqueue requests that fail may need to be removed from the |
177 | proc's locks list, there should be a better way of detecting | |
178 | this situation than checking all these things... */ | |
36098198 | 179 | |
34e22bed DT |
180 | if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV && |
181 | ua->lksb.sb_status == -EAGAIN && !list_empty(&lkb->lkb_ownqueue)) | |
182 | remove_ownqueue = 1; | |
183 | ||
a1bc86e6 DT |
184 | /* unlocks or cancels of waiting requests need to be removed from the |
185 | proc's unlocking list, again there must be a better way... */ | |
186 | ||
187 | if (ua->lksb.sb_status == -DLM_EUNLOCK || | |
188 | (ua->lksb.sb_status == -DLM_ECANCEL && | |
189 | lkb->lkb_grmode == DLM_LOCK_IV)) | |
190 | remove_ownqueue = 1; | |
191 | ||
597d0cae DT |
192 | /* We want to copy the lvb to userspace when the completion |
193 | ast is read if the status is 0, the lock has an lvb and | |
194 | lvb_ops says we should. We could probably have set_lvb_lock() | |
195 | set update_user_lvb instead and not need old_mode */ | |
196 | ||
197 | if ((lkb->lkb_ast_type & AST_COMP) && | |
198 | (lkb->lkb_lksb->sb_status == 0) && | |
199 | lkb->lkb_lksb->sb_lvbptr && | |
200 | dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) | |
201 | ua->update_user_lvb = 1; | |
202 | else | |
203 | ua->update_user_lvb = 0; | |
204 | ||
205 | spin_unlock(&proc->asts_spin); | |
34e22bed DT |
206 | |
207 | if (remove_ownqueue) { | |
208 | spin_lock(&ua->proc->locks_spin); | |
209 | list_del_init(&lkb->lkb_ownqueue); | |
210 | spin_unlock(&ua->proc->locks_spin); | |
211 | dlm_put_lkb(lkb); | |
212 | } | |
597d0cae DT |
213 | out: |
214 | mutex_unlock(&ls->ls_clear_proc_locks); | |
215 | } | |
216 | ||
217 | static int device_user_lock(struct dlm_user_proc *proc, | |
218 | struct dlm_lock_params *params) | |
219 | { | |
220 | struct dlm_ls *ls; | |
221 | struct dlm_user_args *ua; | |
222 | int error = -ENOMEM; | |
223 | ||
224 | ls = dlm_find_lockspace_local(proc->lockspace); | |
225 | if (!ls) | |
226 | return -ENOENT; | |
227 | ||
228 | if (!params->castaddr || !params->lksb) { | |
229 | error = -EINVAL; | |
230 | goto out; | |
231 | } | |
232 | ||
233 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); | |
234 | if (!ua) | |
235 | goto out; | |
236 | ua->proc = proc; | |
237 | ua->user_lksb = params->lksb; | |
238 | ua->castparam = params->castparam; | |
239 | ua->castaddr = params->castaddr; | |
240 | ua->bastparam = params->bastparam; | |
241 | ua->bastaddr = params->bastaddr; | |
242 | ||
243 | if (params->flags & DLM_LKF_CONVERT) | |
244 | error = dlm_user_convert(ls, ua, | |
245 | params->mode, params->flags, | |
246 | params->lkid, params->lvb); | |
247 | else { | |
248 | error = dlm_user_request(ls, ua, | |
249 | params->mode, params->flags, | |
250 | params->name, params->namelen, | |
251 | params->parent); | |
252 | if (!error) | |
253 | error = ua->lksb.sb_lkid; | |
254 | } | |
255 | out: | |
256 | dlm_put_lockspace(ls); | |
257 | return error; | |
258 | } | |
259 | ||
260 | static int device_user_unlock(struct dlm_user_proc *proc, | |
261 | struct dlm_lock_params *params) | |
262 | { | |
263 | struct dlm_ls *ls; | |
264 | struct dlm_user_args *ua; | |
265 | int error = -ENOMEM; | |
266 | ||
267 | ls = dlm_find_lockspace_local(proc->lockspace); | |
268 | if (!ls) | |
269 | return -ENOENT; | |
270 | ||
271 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); | |
272 | if (!ua) | |
273 | goto out; | |
274 | ua->proc = proc; | |
275 | ua->user_lksb = params->lksb; | |
276 | ua->castparam = params->castparam; | |
277 | ua->castaddr = params->castaddr; | |
278 | ||
279 | if (params->flags & DLM_LKF_CANCEL) | |
280 | error = dlm_user_cancel(ls, ua, params->flags, params->lkid); | |
281 | else | |
282 | error = dlm_user_unlock(ls, ua, params->flags, params->lkid, | |
283 | params->lvb); | |
284 | out: | |
285 | dlm_put_lockspace(ls); | |
286 | return error; | |
287 | } | |
288 | ||
254da030 PC |
289 | static int create_misc_device(struct dlm_ls *ls, char *name) |
290 | { | |
291 | int error, len; | |
292 | ||
293 | error = -ENOMEM; | |
294 | len = strlen(name) + strlen(name_prefix) + 2; | |
295 | ls->ls_device.name = kzalloc(len, GFP_KERNEL); | |
296 | if (!ls->ls_device.name) | |
297 | goto fail; | |
298 | ||
299 | snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, | |
300 | name); | |
301 | ls->ls_device.fops = &device_fops; | |
302 | ls->ls_device.minor = MISC_DYNAMIC_MINOR; | |
303 | ||
304 | error = misc_register(&ls->ls_device); | |
305 | if (error) { | |
306 | kfree(ls->ls_device.name); | |
307 | } | |
308 | fail: | |
309 | return error; | |
310 | } | |
311 | ||
597d0cae DT |
312 | static int device_create_lockspace(struct dlm_lspace_params *params) |
313 | { | |
314 | dlm_lockspace_t *lockspace; | |
315 | struct dlm_ls *ls; | |
254da030 | 316 | int error; |
597d0cae DT |
317 | |
318 | if (!capable(CAP_SYS_ADMIN)) | |
319 | return -EPERM; | |
320 | ||
321 | error = dlm_new_lockspace(params->name, strlen(params->name), | |
322 | &lockspace, 0, DLM_USER_LVB_LEN); | |
323 | if (error) | |
324 | return error; | |
325 | ||
326 | ls = dlm_find_lockspace_local(lockspace); | |
327 | if (!ls) | |
328 | return -ENOENT; | |
329 | ||
254da030 | 330 | error = create_misc_device(ls, params->name); |
597d0cae | 331 | dlm_put_lockspace(ls); |
597d0cae | 332 | |
254da030 PC |
333 | if (error) |
334 | dlm_release_lockspace(lockspace, 0); | |
335 | else | |
336 | error = ls->ls_device.minor; | |
337 | ||
597d0cae DT |
338 | return error; |
339 | } | |
340 | ||
341 | static int device_remove_lockspace(struct dlm_lspace_params *params) | |
342 | { | |
343 | dlm_lockspace_t *lockspace; | |
344 | struct dlm_ls *ls; | |
c6e6f0ba | 345 | int error, force = 0; |
597d0cae DT |
346 | |
347 | if (!capable(CAP_SYS_ADMIN)) | |
348 | return -EPERM; | |
349 | ||
350 | ls = dlm_find_lockspace_device(params->minor); | |
351 | if (!ls) | |
352 | return -ENOENT; | |
353 | ||
254da030 PC |
354 | /* Deregister the misc device first, so we don't have |
355 | * a device that's not attached to a lockspace. If | |
356 | * dlm_release_lockspace fails then we can recreate it | |
357 | */ | |
597d0cae DT |
358 | error = misc_deregister(&ls->ls_device); |
359 | if (error) { | |
360 | dlm_put_lockspace(ls); | |
361 | goto out; | |
362 | } | |
363 | kfree(ls->ls_device.name); | |
364 | ||
c6e6f0ba DT |
365 | if (params->flags & DLM_USER_LSFLG_FORCEFREE) |
366 | force = 2; | |
367 | ||
597d0cae DT |
368 | lockspace = ls->ls_local_handle; |
369 | ||
370 | /* dlm_release_lockspace waits for references to go to zero, | |
371 | so all processes will need to close their device for the ls | |
372 | before the release will procede */ | |
373 | ||
374 | dlm_put_lockspace(ls); | |
c6e6f0ba | 375 | error = dlm_release_lockspace(lockspace, force); |
254da030 PC |
376 | if (error) |
377 | create_misc_device(ls, ls->ls_name); | |
c6e6f0ba | 378 | out: |
597d0cae DT |
379 | return error; |
380 | } | |
381 | ||
382 | /* Check the user's version matches ours */ | |
383 | static int check_version(struct dlm_write_request *req) | |
384 | { | |
385 | if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || | |
386 | (req->version[0] == DLM_DEVICE_VERSION_MAJOR && | |
387 | req->version[1] > DLM_DEVICE_VERSION_MINOR)) { | |
388 | ||
389 | printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " | |
390 | "user (%d.%d.%d) kernel (%d.%d.%d)\n", | |
391 | current->comm, | |
392 | current->pid, | |
393 | req->version[0], | |
394 | req->version[1], | |
395 | req->version[2], | |
396 | DLM_DEVICE_VERSION_MAJOR, | |
397 | DLM_DEVICE_VERSION_MINOR, | |
398 | DLM_DEVICE_VERSION_PATCH); | |
399 | return -EINVAL; | |
400 | } | |
401 | return 0; | |
402 | } | |
403 | ||
404 | /* | |
405 | * device_write | |
406 | * | |
407 | * device_user_lock | |
408 | * dlm_user_request -> request_lock | |
409 | * dlm_user_convert -> convert_lock | |
410 | * | |
411 | * device_user_unlock | |
412 | * dlm_user_unlock -> unlock_lock | |
413 | * dlm_user_cancel -> cancel_lock | |
414 | * | |
415 | * device_create_lockspace | |
416 | * dlm_new_lockspace | |
417 | * | |
418 | * device_remove_lockspace | |
419 | * dlm_release_lockspace | |
420 | */ | |
421 | ||
422 | /* a write to a lockspace device is a lock or unlock request, a write | |
423 | to the control device is to create/remove a lockspace */ | |
424 | ||
425 | static ssize_t device_write(struct file *file, const char __user *buf, | |
426 | size_t count, loff_t *ppos) | |
427 | { | |
428 | struct dlm_user_proc *proc = file->private_data; | |
429 | struct dlm_write_request *kbuf; | |
430 | sigset_t tmpsig, allsigs; | |
431 | int error; | |
432 | ||
433 | #ifdef CONFIG_COMPAT | |
434 | if (count < sizeof(struct dlm_write_request32)) | |
435 | #else | |
436 | if (count < sizeof(struct dlm_write_request)) | |
437 | #endif | |
438 | return -EINVAL; | |
439 | ||
440 | kbuf = kmalloc(count, GFP_KERNEL); | |
441 | if (!kbuf) | |
442 | return -ENOMEM; | |
443 | ||
444 | if (copy_from_user(kbuf, buf, count)) { | |
445 | error = -EFAULT; | |
446 | goto out_free; | |
447 | } | |
448 | ||
449 | if (check_version(kbuf)) { | |
450 | error = -EBADE; | |
451 | goto out_free; | |
452 | } | |
453 | ||
454 | #ifdef CONFIG_COMPAT | |
455 | if (!kbuf->is64bit) { | |
456 | struct dlm_write_request32 *k32buf; | |
457 | k32buf = (struct dlm_write_request32 *)kbuf; | |
458 | kbuf = kmalloc(count + (sizeof(struct dlm_write_request) - | |
459 | sizeof(struct dlm_write_request32)), GFP_KERNEL); | |
460 | if (!kbuf) | |
461 | return -ENOMEM; | |
462 | ||
463 | if (proc) | |
464 | set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); | |
465 | compat_input(kbuf, k32buf); | |
466 | kfree(k32buf); | |
467 | } | |
468 | #endif | |
469 | ||
470 | /* do we really need this? can a write happen after a close? */ | |
471 | if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && | |
472 | test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
473 | return -EINVAL; | |
474 | ||
475 | sigfillset(&allsigs); | |
476 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
477 | ||
478 | error = -EINVAL; | |
479 | ||
480 | switch (kbuf->cmd) | |
481 | { | |
482 | case DLM_USER_LOCK: | |
483 | if (!proc) { | |
484 | log_print("no locking on control device"); | |
485 | goto out_sig; | |
486 | } | |
487 | error = device_user_lock(proc, &kbuf->i.lock); | |
488 | break; | |
489 | ||
490 | case DLM_USER_UNLOCK: | |
491 | if (!proc) { | |
492 | log_print("no locking on control device"); | |
493 | goto out_sig; | |
494 | } | |
495 | error = device_user_unlock(proc, &kbuf->i.lock); | |
496 | break; | |
497 | ||
498 | case DLM_USER_CREATE_LOCKSPACE: | |
499 | if (proc) { | |
500 | log_print("create/remove only on control device"); | |
501 | goto out_sig; | |
502 | } | |
503 | error = device_create_lockspace(&kbuf->i.lspace); | |
504 | break; | |
505 | ||
506 | case DLM_USER_REMOVE_LOCKSPACE: | |
507 | if (proc) { | |
508 | log_print("create/remove only on control device"); | |
509 | goto out_sig; | |
510 | } | |
511 | error = device_remove_lockspace(&kbuf->i.lspace); | |
512 | break; | |
513 | ||
514 | default: | |
515 | log_print("Unknown command passed to DLM device : %d\n", | |
516 | kbuf->cmd); | |
517 | } | |
518 | ||
519 | out_sig: | |
520 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
521 | recalc_sigpending(); | |
522 | out_free: | |
523 | kfree(kbuf); | |
524 | return error; | |
525 | } | |
526 | ||
527 | /* Every process that opens the lockspace device has its own "proc" structure | |
528 | hanging off the open file that's used to keep track of locks owned by the | |
529 | process and asts that need to be delivered to the process. */ | |
530 | ||
531 | static int device_open(struct inode *inode, struct file *file) | |
532 | { | |
533 | struct dlm_user_proc *proc; | |
534 | struct dlm_ls *ls; | |
535 | ||
536 | ls = dlm_find_lockspace_device(iminor(inode)); | |
537 | if (!ls) | |
538 | return -ENOENT; | |
539 | ||
540 | proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); | |
541 | if (!proc) { | |
542 | dlm_put_lockspace(ls); | |
543 | return -ENOMEM; | |
544 | } | |
545 | ||
546 | proc->lockspace = ls->ls_local_handle; | |
547 | INIT_LIST_HEAD(&proc->asts); | |
548 | INIT_LIST_HEAD(&proc->locks); | |
a1bc86e6 | 549 | INIT_LIST_HEAD(&proc->unlocking); |
597d0cae DT |
550 | spin_lock_init(&proc->asts_spin); |
551 | spin_lock_init(&proc->locks_spin); | |
552 | init_waitqueue_head(&proc->wait); | |
553 | file->private_data = proc; | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static int device_close(struct inode *inode, struct file *file) | |
559 | { | |
560 | struct dlm_user_proc *proc = file->private_data; | |
561 | struct dlm_ls *ls; | |
562 | sigset_t tmpsig, allsigs; | |
563 | ||
564 | ls = dlm_find_lockspace_local(proc->lockspace); | |
565 | if (!ls) | |
566 | return -ENOENT; | |
567 | ||
568 | sigfillset(&allsigs); | |
569 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
570 | ||
571 | set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); | |
572 | ||
573 | dlm_clear_proc_locks(ls, proc); | |
574 | ||
575 | /* at this point no more lkb's should exist for this lockspace, | |
576 | so there's no chance of dlm_user_add_ast() being called and | |
577 | looking for lkb->ua->proc */ | |
578 | ||
579 | kfree(proc); | |
580 | file->private_data = NULL; | |
581 | ||
582 | dlm_put_lockspace(ls); | |
583 | dlm_put_lockspace(ls); /* for the find in device_open() */ | |
584 | ||
585 | /* FIXME: AUTOFREE: if this ls is no longer used do | |
586 | device_remove_lockspace() */ | |
587 | ||
588 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
589 | recalc_sigpending(); | |
590 | ||
591 | return 0; | |
592 | } | |
593 | ||
594 | static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, | |
595 | int bmode, char __user *buf, size_t count) | |
596 | { | |
597 | #ifdef CONFIG_COMPAT | |
598 | struct dlm_lock_result32 result32; | |
599 | #endif | |
600 | struct dlm_lock_result result; | |
601 | void *resultptr; | |
602 | int error=0; | |
603 | int len; | |
604 | int struct_len; | |
605 | ||
606 | memset(&result, 0, sizeof(struct dlm_lock_result)); | |
607 | memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); | |
608 | result.user_lksb = ua->user_lksb; | |
609 | ||
610 | /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated | |
611 | in a conversion unless the conversion is successful. See code | |
612 | in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, | |
613 | notes that a new blocking AST address and parameter are set even if | |
614 | the conversion fails, so maybe we should just do that. */ | |
615 | ||
616 | if (type == AST_BAST) { | |
617 | result.user_astaddr = ua->bastaddr; | |
618 | result.user_astparam = ua->bastparam; | |
619 | result.bast_mode = bmode; | |
620 | } else { | |
621 | result.user_astaddr = ua->castaddr; | |
622 | result.user_astparam = ua->castparam; | |
623 | } | |
624 | ||
625 | #ifdef CONFIG_COMPAT | |
626 | if (compat) | |
627 | len = sizeof(struct dlm_lock_result32); | |
628 | else | |
629 | #endif | |
630 | len = sizeof(struct dlm_lock_result); | |
631 | struct_len = len; | |
632 | ||
633 | /* copy lvb to userspace if there is one, it's been updated, and | |
634 | the user buffer has space for it */ | |
635 | ||
636 | if (ua->update_user_lvb && ua->lksb.sb_lvbptr && | |
637 | count >= len + DLM_USER_LVB_LEN) { | |
638 | if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, | |
639 | DLM_USER_LVB_LEN)) { | |
640 | error = -EFAULT; | |
641 | goto out; | |
642 | } | |
643 | ||
644 | result.lvb_offset = len; | |
645 | len += DLM_USER_LVB_LEN; | |
646 | } | |
647 | ||
648 | result.length = len; | |
649 | resultptr = &result; | |
650 | #ifdef CONFIG_COMPAT | |
651 | if (compat) { | |
652 | compat_output(&result, &result32); | |
653 | resultptr = &result32; | |
654 | } | |
655 | #endif | |
656 | ||
657 | if (copy_to_user(buf, resultptr, struct_len)) | |
658 | error = -EFAULT; | |
659 | else | |
660 | error = len; | |
661 | out: | |
662 | return error; | |
663 | } | |
664 | ||
665 | /* a read returns a single ast described in a struct dlm_lock_result */ | |
666 | ||
667 | static ssize_t device_read(struct file *file, char __user *buf, size_t count, | |
668 | loff_t *ppos) | |
669 | { | |
670 | struct dlm_user_proc *proc = file->private_data; | |
671 | struct dlm_lkb *lkb; | |
672 | struct dlm_user_args *ua; | |
673 | DECLARE_WAITQUEUE(wait, current); | |
674 | int error, type=0, bmode=0, removed = 0; | |
675 | ||
676 | #ifdef CONFIG_COMPAT | |
677 | if (count < sizeof(struct dlm_lock_result32)) | |
678 | #else | |
679 | if (count < sizeof(struct dlm_lock_result)) | |
680 | #endif | |
681 | return -EINVAL; | |
682 | ||
683 | /* do we really need this? can a read happen after a close? */ | |
684 | if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
685 | return -EINVAL; | |
686 | ||
687 | spin_lock(&proc->asts_spin); | |
688 | if (list_empty(&proc->asts)) { | |
689 | if (file->f_flags & O_NONBLOCK) { | |
690 | spin_unlock(&proc->asts_spin); | |
691 | return -EAGAIN; | |
692 | } | |
693 | ||
694 | add_wait_queue(&proc->wait, &wait); | |
695 | ||
696 | repeat: | |
697 | set_current_state(TASK_INTERRUPTIBLE); | |
698 | if (list_empty(&proc->asts) && !signal_pending(current)) { | |
699 | spin_unlock(&proc->asts_spin); | |
700 | schedule(); | |
701 | spin_lock(&proc->asts_spin); | |
702 | goto repeat; | |
703 | } | |
704 | set_current_state(TASK_RUNNING); | |
705 | remove_wait_queue(&proc->wait, &wait); | |
706 | ||
707 | if (signal_pending(current)) { | |
708 | spin_unlock(&proc->asts_spin); | |
709 | return -ERESTARTSYS; | |
710 | } | |
711 | } | |
712 | ||
713 | if (list_empty(&proc->asts)) { | |
714 | spin_unlock(&proc->asts_spin); | |
715 | return -EAGAIN; | |
716 | } | |
717 | ||
718 | /* there may be both completion and blocking asts to return for | |
719 | the lkb, don't remove lkb from asts list unless no asts remain */ | |
720 | ||
721 | lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); | |
722 | ||
723 | if (lkb->lkb_ast_type & AST_COMP) { | |
724 | lkb->lkb_ast_type &= ~AST_COMP; | |
725 | type = AST_COMP; | |
726 | } else if (lkb->lkb_ast_type & AST_BAST) { | |
727 | lkb->lkb_ast_type &= ~AST_BAST; | |
728 | type = AST_BAST; | |
729 | bmode = lkb->lkb_bastmode; | |
730 | } | |
731 | ||
732 | if (!lkb->lkb_ast_type) { | |
733 | list_del(&lkb->lkb_astqueue); | |
734 | removed = 1; | |
735 | } | |
736 | spin_unlock(&proc->asts_spin); | |
737 | ||
738 | ua = (struct dlm_user_args *)lkb->lkb_astparam; | |
739 | error = copy_result_to_user(ua, | |
740 | test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), | |
741 | type, bmode, buf, count); | |
742 | ||
743 | /* removes reference for the proc->asts lists added by | |
744 | dlm_user_add_ast() and may result in the lkb being freed */ | |
745 | if (removed) | |
746 | dlm_put_lkb(lkb); | |
747 | ||
748 | return error; | |
749 | } | |
750 | ||
751 | static unsigned int device_poll(struct file *file, poll_table *wait) | |
752 | { | |
753 | struct dlm_user_proc *proc = file->private_data; | |
754 | ||
755 | poll_wait(file, &proc->wait, wait); | |
756 | ||
757 | spin_lock(&proc->asts_spin); | |
758 | if (!list_empty(&proc->asts)) { | |
759 | spin_unlock(&proc->asts_spin); | |
760 | return POLLIN | POLLRDNORM; | |
761 | } | |
762 | spin_unlock(&proc->asts_spin); | |
763 | return 0; | |
764 | } | |
765 | ||
766 | static int ctl_device_open(struct inode *inode, struct file *file) | |
767 | { | |
768 | file->private_data = NULL; | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static int ctl_device_close(struct inode *inode, struct file *file) | |
773 | { | |
774 | return 0; | |
775 | } | |
776 | ||
00977a59 | 777 | static const struct file_operations device_fops = { |
597d0cae DT |
778 | .open = device_open, |
779 | .release = device_close, | |
780 | .read = device_read, | |
781 | .write = device_write, | |
782 | .poll = device_poll, | |
783 | .owner = THIS_MODULE, | |
784 | }; | |
785 | ||
00977a59 | 786 | static const struct file_operations ctl_device_fops = { |
597d0cae DT |
787 | .open = ctl_device_open, |
788 | .release = ctl_device_close, | |
789 | .write = device_write, | |
790 | .owner = THIS_MODULE, | |
791 | }; | |
792 | ||
793 | int dlm_user_init(void) | |
794 | { | |
795 | int error; | |
796 | ||
797 | ctl_device.name = "dlm-control"; | |
798 | ctl_device.fops = &ctl_device_fops; | |
799 | ctl_device.minor = MISC_DYNAMIC_MINOR; | |
800 | ||
801 | error = misc_register(&ctl_device); | |
802 | if (error) | |
803 | log_print("misc_register failed for control device"); | |
804 | ||
805 | return error; | |
806 | } | |
807 | ||
808 | void dlm_user_exit(void) | |
809 | { | |
810 | misc_deregister(&ctl_device); | |
811 | } | |
812 |