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> | |
514bcc66 | 18 | #include <linux/smp_lock.h> |
597d0cae DT |
19 | #include <linux/dlm.h> |
20 | #include <linux/dlm_device.h> | |
21 | ||
22 | #include "dlm_internal.h" | |
23 | #include "lockspace.h" | |
24 | #include "lock.h" | |
25 | #include "lvb_table.h" | |
84c6e8cd | 26 | #include "user.h" |
597d0cae | 27 | |
0fe410d3 | 28 | static const char name_prefix[] = "dlm"; |
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; | |
d7db923e DT |
36 | __u16 unused; |
37 | __u32 flags; | |
597d0cae DT |
38 | __u32 lkid; |
39 | __u32 parent; | |
d7db923e DT |
40 | __u64 xid; |
41 | __u64 timeout; | |
597d0cae DT |
42 | __u32 castparam; |
43 | __u32 castaddr; | |
44 | __u32 bastparam; | |
45 | __u32 bastaddr; | |
46 | __u32 lksb; | |
597d0cae DT |
47 | char lvb[DLM_USER_LVB_LEN]; |
48 | char name[0]; | |
49 | }; | |
50 | ||
51 | struct dlm_write_request32 { | |
52 | __u32 version[3]; | |
53 | __u8 cmd; | |
54 | __u8 is64bit; | |
55 | __u8 unused[2]; | |
56 | ||
57 | union { | |
58 | struct dlm_lock_params32 lock; | |
59 | struct dlm_lspace_params lspace; | |
72c2be77 | 60 | struct dlm_purge_params purge; |
597d0cae DT |
61 | } i; |
62 | }; | |
63 | ||
64 | struct dlm_lksb32 { | |
65 | __u32 sb_status; | |
66 | __u32 sb_lkid; | |
67 | __u8 sb_flags; | |
68 | __u32 sb_lvbptr; | |
69 | }; | |
70 | ||
71 | struct dlm_lock_result32 { | |
d7db923e | 72 | __u32 version[3]; |
597d0cae DT |
73 | __u32 length; |
74 | __u32 user_astaddr; | |
75 | __u32 user_astparam; | |
76 | __u32 user_lksb; | |
77 | struct dlm_lksb32 lksb; | |
78 | __u8 bast_mode; | |
79 | __u8 unused[3]; | |
80 | /* Offsets may be zero if no data is present */ | |
81 | __u32 lvb_offset; | |
82 | }; | |
83 | ||
84 | static void compat_input(struct dlm_write_request *kb, | |
2a79289e | 85 | struct dlm_write_request32 *kb32, |
cb79f199 | 86 | size_t count) |
597d0cae DT |
87 | { |
88 | kb->version[0] = kb32->version[0]; | |
89 | kb->version[1] = kb32->version[1]; | |
90 | kb->version[2] = kb32->version[2]; | |
91 | ||
92 | kb->cmd = kb32->cmd; | |
93 | kb->is64bit = kb32->is64bit; | |
94 | if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || | |
95 | kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { | |
96 | kb->i.lspace.flags = kb32->i.lspace.flags; | |
97 | kb->i.lspace.minor = kb32->i.lspace.minor; | |
cb79f199 AV |
98 | memcpy(kb->i.lspace.name, kb32->i.lspace.name, count - |
99 | offsetof(struct dlm_write_request32, i.lspace.name)); | |
72c2be77 DT |
100 | } else if (kb->cmd == DLM_USER_PURGE) { |
101 | kb->i.purge.nodeid = kb32->i.purge.nodeid; | |
102 | kb->i.purge.pid = kb32->i.purge.pid; | |
597d0cae DT |
103 | } else { |
104 | kb->i.lock.mode = kb32->i.lock.mode; | |
105 | kb->i.lock.namelen = kb32->i.lock.namelen; | |
106 | kb->i.lock.flags = kb32->i.lock.flags; | |
107 | kb->i.lock.lkid = kb32->i.lock.lkid; | |
108 | kb->i.lock.parent = kb32->i.lock.parent; | |
d7db923e DT |
109 | kb->i.lock.xid = kb32->i.lock.xid; |
110 | kb->i.lock.timeout = kb32->i.lock.timeout; | |
597d0cae DT |
111 | kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; |
112 | kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; | |
113 | kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; | |
114 | kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; | |
115 | kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; | |
116 | memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); | |
cb79f199 AV |
117 | memcpy(kb->i.lock.name, kb32->i.lock.name, count - |
118 | offsetof(struct dlm_write_request32, i.lock.name)); | |
597d0cae DT |
119 | } |
120 | } | |
121 | ||
122 | static void compat_output(struct dlm_lock_result *res, | |
123 | struct dlm_lock_result32 *res32) | |
124 | { | |
d7db923e DT |
125 | res32->version[0] = res->version[0]; |
126 | res32->version[1] = res->version[1]; | |
127 | res32->version[2] = res->version[2]; | |
128 | ||
597d0cae DT |
129 | res32->user_astaddr = (__u32)(long)res->user_astaddr; |
130 | res32->user_astparam = (__u32)(long)res->user_astparam; | |
131 | res32->user_lksb = (__u32)(long)res->user_lksb; | |
132 | res32->bast_mode = res->bast_mode; | |
133 | ||
134 | res32->lvb_offset = res->lvb_offset; | |
135 | res32->length = res->length; | |
136 | ||
137 | res32->lksb.sb_status = res->lksb.sb_status; | |
138 | res32->lksb.sb_flags = res->lksb.sb_flags; | |
139 | res32->lksb.sb_lkid = res->lksb.sb_lkid; | |
140 | res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; | |
141 | } | |
142 | #endif | |
143 | ||
84d8cd69 DT |
144 | /* Figure out if this lock is at the end of its life and no longer |
145 | available for the application to use. The lkb still exists until | |
146 | the final ast is read. A lock becomes EOL in three situations: | |
147 | 1. a noqueue request fails with EAGAIN | |
148 | 2. an unlock completes with EUNLOCK | |
149 | 3. a cancel of a waiting request completes with ECANCEL/EDEADLK | |
150 | An EOL lock needs to be removed from the process's list of locks. | |
151 | And we can't allow any new operation on an EOL lock. This is | |
152 | not related to the lifetime of the lkb struct which is managed | |
153 | entirely by refcount. */ | |
154 | ||
155 | static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) | |
156 | { | |
157 | switch (sb_status) { | |
158 | case -DLM_EUNLOCK: | |
159 | return 1; | |
160 | case -DLM_ECANCEL: | |
161 | case -ETIMEDOUT: | |
8b4021fa | 162 | case -EDEADLK: |
84d8cd69 DT |
163 | if (lkb->lkb_grmode == DLM_LOCK_IV) |
164 | return 1; | |
165 | break; | |
166 | case -EAGAIN: | |
167 | if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV) | |
168 | return 1; | |
169 | break; | |
170 | } | |
171 | return 0; | |
172 | } | |
173 | ||
ef0c2bb0 DT |
174 | /* we could possibly check if the cancel of an orphan has resulted in the lkb |
175 | being removed and then remove that lkb from the orphans list and free it */ | |
597d0cae DT |
176 | |
177 | void dlm_user_add_ast(struct dlm_lkb *lkb, int type) | |
178 | { | |
179 | struct dlm_ls *ls; | |
180 | struct dlm_user_args *ua; | |
181 | struct dlm_user_proc *proc; | |
ef0c2bb0 | 182 | int eol = 0, ast_type; |
597d0cae | 183 | |
ef0c2bb0 | 184 | if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) |
597d0cae | 185 | return; |
597d0cae DT |
186 | |
187 | ls = lkb->lkb_resource->res_ls; | |
188 | mutex_lock(&ls->ls_clear_proc_locks); | |
189 | ||
190 | /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast | |
191 | can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed | |
ef0c2bb0 DT |
192 | lkb->ua so we can't try to use it. This second check is necessary |
193 | for cases where a completion ast is received for an operation that | |
194 | began before clear_proc_locks did its cancel/unlock. */ | |
597d0cae | 195 | |
ef0c2bb0 | 196 | if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) |
597d0cae | 197 | goto out; |
597d0cae | 198 | |
d292c0cc DT |
199 | DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb);); |
200 | ua = lkb->lkb_ua; | |
597d0cae DT |
201 | proc = ua->proc; |
202 | ||
203 | if (type == AST_BAST && ua->bastaddr == NULL) | |
204 | goto out; | |
205 | ||
206 | spin_lock(&proc->asts_spin); | |
ef0c2bb0 DT |
207 | |
208 | ast_type = lkb->lkb_ast_type; | |
209 | lkb->lkb_ast_type |= type; | |
210 | ||
211 | if (!ast_type) { | |
597d0cae DT |
212 | kref_get(&lkb->lkb_ref); |
213 | list_add_tail(&lkb->lkb_astqueue, &proc->asts); | |
597d0cae DT |
214 | wake_up_interruptible(&proc->wait); |
215 | } | |
ef0c2bb0 DT |
216 | if (type == AST_COMP && (ast_type & AST_COMP)) |
217 | log_debug(ls, "ast overlap %x status %x %x", | |
218 | lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags); | |
219 | ||
84d8cd69 | 220 | eol = lkb_is_endoflife(lkb, ua->lksb.sb_status, type); |
ef0c2bb0 DT |
221 | if (eol) { |
222 | lkb->lkb_ast_type &= ~AST_BAST; | |
223 | lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; | |
224 | } | |
a1bc86e6 | 225 | |
597d0cae DT |
226 | /* We want to copy the lvb to userspace when the completion |
227 | ast is read if the status is 0, the lock has an lvb and | |
228 | lvb_ops says we should. We could probably have set_lvb_lock() | |
229 | set update_user_lvb instead and not need old_mode */ | |
230 | ||
231 | if ((lkb->lkb_ast_type & AST_COMP) && | |
232 | (lkb->lkb_lksb->sb_status == 0) && | |
233 | lkb->lkb_lksb->sb_lvbptr && | |
234 | dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) | |
235 | ua->update_user_lvb = 1; | |
236 | else | |
237 | ua->update_user_lvb = 0; | |
238 | ||
239 | spin_unlock(&proc->asts_spin); | |
34e22bed | 240 | |
ef0c2bb0 | 241 | if (eol) { |
ce5246b9 | 242 | spin_lock(&proc->locks_spin); |
ef0c2bb0 DT |
243 | if (!list_empty(&lkb->lkb_ownqueue)) { |
244 | list_del_init(&lkb->lkb_ownqueue); | |
245 | dlm_put_lkb(lkb); | |
246 | } | |
ce5246b9 | 247 | spin_unlock(&proc->locks_spin); |
34e22bed | 248 | } |
597d0cae DT |
249 | out: |
250 | mutex_unlock(&ls->ls_clear_proc_locks); | |
251 | } | |
252 | ||
253 | static int device_user_lock(struct dlm_user_proc *proc, | |
254 | struct dlm_lock_params *params) | |
255 | { | |
256 | struct dlm_ls *ls; | |
257 | struct dlm_user_args *ua; | |
258 | int error = -ENOMEM; | |
259 | ||
260 | ls = dlm_find_lockspace_local(proc->lockspace); | |
261 | if (!ls) | |
262 | return -ENOENT; | |
263 | ||
264 | if (!params->castaddr || !params->lksb) { | |
265 | error = -EINVAL; | |
266 | goto out; | |
267 | } | |
268 | ||
269 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); | |
270 | if (!ua) | |
271 | goto out; | |
272 | ua->proc = proc; | |
273 | ua->user_lksb = params->lksb; | |
274 | ua->castparam = params->castparam; | |
275 | ua->castaddr = params->castaddr; | |
276 | ua->bastparam = params->bastparam; | |
277 | ua->bastaddr = params->bastaddr; | |
d7db923e | 278 | ua->xid = params->xid; |
597d0cae DT |
279 | |
280 | if (params->flags & DLM_LKF_CONVERT) | |
281 | error = dlm_user_convert(ls, ua, | |
282 | params->mode, params->flags, | |
d7db923e DT |
283 | params->lkid, params->lvb, |
284 | (unsigned long) params->timeout); | |
597d0cae DT |
285 | else { |
286 | error = dlm_user_request(ls, ua, | |
287 | params->mode, params->flags, | |
288 | params->name, params->namelen, | |
d7db923e | 289 | (unsigned long) params->timeout); |
597d0cae DT |
290 | if (!error) |
291 | error = ua->lksb.sb_lkid; | |
292 | } | |
293 | out: | |
294 | dlm_put_lockspace(ls); | |
295 | return error; | |
296 | } | |
297 | ||
298 | static int device_user_unlock(struct dlm_user_proc *proc, | |
299 | struct dlm_lock_params *params) | |
300 | { | |
301 | struct dlm_ls *ls; | |
302 | struct dlm_user_args *ua; | |
303 | int error = -ENOMEM; | |
304 | ||
305 | ls = dlm_find_lockspace_local(proc->lockspace); | |
306 | if (!ls) | |
307 | return -ENOENT; | |
308 | ||
309 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_KERNEL); | |
310 | if (!ua) | |
311 | goto out; | |
312 | ua->proc = proc; | |
313 | ua->user_lksb = params->lksb; | |
314 | ua->castparam = params->castparam; | |
315 | ua->castaddr = params->castaddr; | |
316 | ||
317 | if (params->flags & DLM_LKF_CANCEL) | |
318 | error = dlm_user_cancel(ls, ua, params->flags, params->lkid); | |
319 | else | |
320 | error = dlm_user_unlock(ls, ua, params->flags, params->lkid, | |
321 | params->lvb); | |
322 | out: | |
323 | dlm_put_lockspace(ls); | |
324 | return error; | |
325 | } | |
326 | ||
8b4021fa DT |
327 | static int device_user_deadlock(struct dlm_user_proc *proc, |
328 | struct dlm_lock_params *params) | |
329 | { | |
330 | struct dlm_ls *ls; | |
331 | int error; | |
332 | ||
333 | ls = dlm_find_lockspace_local(proc->lockspace); | |
334 | if (!ls) | |
335 | return -ENOENT; | |
336 | ||
337 | error = dlm_user_deadlock(ls, params->flags, params->lkid); | |
338 | ||
339 | dlm_put_lockspace(ls); | |
340 | return error; | |
341 | } | |
342 | ||
254da030 PC |
343 | static int create_misc_device(struct dlm_ls *ls, char *name) |
344 | { | |
345 | int error, len; | |
346 | ||
347 | error = -ENOMEM; | |
348 | len = strlen(name) + strlen(name_prefix) + 2; | |
349 | ls->ls_device.name = kzalloc(len, GFP_KERNEL); | |
350 | if (!ls->ls_device.name) | |
351 | goto fail; | |
352 | ||
353 | snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, | |
354 | name); | |
355 | ls->ls_device.fops = &device_fops; | |
356 | ls->ls_device.minor = MISC_DYNAMIC_MINOR; | |
357 | ||
358 | error = misc_register(&ls->ls_device); | |
359 | if (error) { | |
360 | kfree(ls->ls_device.name); | |
361 | } | |
362 | fail: | |
363 | return error; | |
364 | } | |
365 | ||
72c2be77 DT |
366 | static int device_user_purge(struct dlm_user_proc *proc, |
367 | struct dlm_purge_params *params) | |
368 | { | |
369 | struct dlm_ls *ls; | |
370 | int error; | |
371 | ||
372 | ls = dlm_find_lockspace_local(proc->lockspace); | |
373 | if (!ls) | |
374 | return -ENOENT; | |
375 | ||
376 | error = dlm_user_purge(ls, proc, params->nodeid, params->pid); | |
377 | ||
378 | dlm_put_lockspace(ls); | |
379 | return error; | |
380 | } | |
381 | ||
597d0cae DT |
382 | static int device_create_lockspace(struct dlm_lspace_params *params) |
383 | { | |
384 | dlm_lockspace_t *lockspace; | |
385 | struct dlm_ls *ls; | |
254da030 | 386 | int error; |
597d0cae DT |
387 | |
388 | if (!capable(CAP_SYS_ADMIN)) | |
389 | return -EPERM; | |
390 | ||
391 | error = dlm_new_lockspace(params->name, strlen(params->name), | |
3ae1acf9 | 392 | &lockspace, params->flags, DLM_USER_LVB_LEN); |
597d0cae DT |
393 | if (error) |
394 | return error; | |
395 | ||
396 | ls = dlm_find_lockspace_local(lockspace); | |
397 | if (!ls) | |
398 | return -ENOENT; | |
399 | ||
254da030 | 400 | error = create_misc_device(ls, params->name); |
597d0cae | 401 | dlm_put_lockspace(ls); |
597d0cae | 402 | |
254da030 PC |
403 | if (error) |
404 | dlm_release_lockspace(lockspace, 0); | |
405 | else | |
406 | error = ls->ls_device.minor; | |
407 | ||
597d0cae DT |
408 | return error; |
409 | } | |
410 | ||
411 | static int device_remove_lockspace(struct dlm_lspace_params *params) | |
412 | { | |
413 | dlm_lockspace_t *lockspace; | |
414 | struct dlm_ls *ls; | |
c6e6f0ba | 415 | int error, force = 0; |
597d0cae DT |
416 | |
417 | if (!capable(CAP_SYS_ADMIN)) | |
418 | return -EPERM; | |
419 | ||
420 | ls = dlm_find_lockspace_device(params->minor); | |
421 | if (!ls) | |
422 | return -ENOENT; | |
423 | ||
254da030 PC |
424 | /* Deregister the misc device first, so we don't have |
425 | * a device that's not attached to a lockspace. If | |
426 | * dlm_release_lockspace fails then we can recreate it | |
427 | */ | |
597d0cae DT |
428 | error = misc_deregister(&ls->ls_device); |
429 | if (error) { | |
430 | dlm_put_lockspace(ls); | |
431 | goto out; | |
432 | } | |
433 | kfree(ls->ls_device.name); | |
434 | ||
c6e6f0ba DT |
435 | if (params->flags & DLM_USER_LSFLG_FORCEFREE) |
436 | force = 2; | |
437 | ||
597d0cae DT |
438 | lockspace = ls->ls_local_handle; |
439 | ||
440 | /* dlm_release_lockspace waits for references to go to zero, | |
441 | so all processes will need to close their device for the ls | |
442 | before the release will procede */ | |
443 | ||
444 | dlm_put_lockspace(ls); | |
c6e6f0ba | 445 | error = dlm_release_lockspace(lockspace, force); |
254da030 PC |
446 | if (error) |
447 | create_misc_device(ls, ls->ls_name); | |
c6e6f0ba | 448 | out: |
597d0cae DT |
449 | return error; |
450 | } | |
451 | ||
452 | /* Check the user's version matches ours */ | |
453 | static int check_version(struct dlm_write_request *req) | |
454 | { | |
455 | if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || | |
456 | (req->version[0] == DLM_DEVICE_VERSION_MAJOR && | |
457 | req->version[1] > DLM_DEVICE_VERSION_MINOR)) { | |
458 | ||
459 | printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " | |
460 | "user (%d.%d.%d) kernel (%d.%d.%d)\n", | |
461 | current->comm, | |
ba25f9dc | 462 | task_pid_nr(current), |
597d0cae DT |
463 | req->version[0], |
464 | req->version[1], | |
465 | req->version[2], | |
466 | DLM_DEVICE_VERSION_MAJOR, | |
467 | DLM_DEVICE_VERSION_MINOR, | |
468 | DLM_DEVICE_VERSION_PATCH); | |
469 | return -EINVAL; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | /* | |
475 | * device_write | |
476 | * | |
477 | * device_user_lock | |
478 | * dlm_user_request -> request_lock | |
479 | * dlm_user_convert -> convert_lock | |
480 | * | |
481 | * device_user_unlock | |
482 | * dlm_user_unlock -> unlock_lock | |
483 | * dlm_user_cancel -> cancel_lock | |
484 | * | |
485 | * device_create_lockspace | |
486 | * dlm_new_lockspace | |
487 | * | |
488 | * device_remove_lockspace | |
489 | * dlm_release_lockspace | |
490 | */ | |
491 | ||
492 | /* a write to a lockspace device is a lock or unlock request, a write | |
493 | to the control device is to create/remove a lockspace */ | |
494 | ||
495 | static ssize_t device_write(struct file *file, const char __user *buf, | |
496 | size_t count, loff_t *ppos) | |
497 | { | |
498 | struct dlm_user_proc *proc = file->private_data; | |
499 | struct dlm_write_request *kbuf; | |
500 | sigset_t tmpsig, allsigs; | |
501 | int error; | |
502 | ||
503 | #ifdef CONFIG_COMPAT | |
504 | if (count < sizeof(struct dlm_write_request32)) | |
505 | #else | |
506 | if (count < sizeof(struct dlm_write_request)) | |
507 | #endif | |
508 | return -EINVAL; | |
509 | ||
cb79f199 | 510 | kbuf = kzalloc(count + 1, GFP_KERNEL); |
597d0cae DT |
511 | if (!kbuf) |
512 | return -ENOMEM; | |
513 | ||
514 | if (copy_from_user(kbuf, buf, count)) { | |
515 | error = -EFAULT; | |
516 | goto out_free; | |
517 | } | |
518 | ||
519 | if (check_version(kbuf)) { | |
520 | error = -EBADE; | |
521 | goto out_free; | |
522 | } | |
523 | ||
524 | #ifdef CONFIG_COMPAT | |
525 | if (!kbuf->is64bit) { | |
526 | struct dlm_write_request32 *k32buf; | |
527 | k32buf = (struct dlm_write_request32 *)kbuf; | |
cb79f199 | 528 | kbuf = kmalloc(count + 1 + (sizeof(struct dlm_write_request) - |
597d0cae DT |
529 | sizeof(struct dlm_write_request32)), GFP_KERNEL); |
530 | if (!kbuf) | |
531 | return -ENOMEM; | |
532 | ||
533 | if (proc) | |
534 | set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); | |
cb79f199 | 535 | compat_input(kbuf, k32buf, count + 1); |
597d0cae DT |
536 | kfree(k32buf); |
537 | } | |
538 | #endif | |
539 | ||
540 | /* do we really need this? can a write happen after a close? */ | |
541 | if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && | |
254ae43a | 542 | (proc && test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags))) |
597d0cae DT |
543 | return -EINVAL; |
544 | ||
545 | sigfillset(&allsigs); | |
546 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
547 | ||
548 | error = -EINVAL; | |
549 | ||
550 | switch (kbuf->cmd) | |
551 | { | |
552 | case DLM_USER_LOCK: | |
553 | if (!proc) { | |
554 | log_print("no locking on control device"); | |
555 | goto out_sig; | |
556 | } | |
557 | error = device_user_lock(proc, &kbuf->i.lock); | |
558 | break; | |
559 | ||
560 | case DLM_USER_UNLOCK: | |
561 | if (!proc) { | |
562 | log_print("no locking on control device"); | |
563 | goto out_sig; | |
564 | } | |
565 | error = device_user_unlock(proc, &kbuf->i.lock); | |
566 | break; | |
567 | ||
8b4021fa DT |
568 | case DLM_USER_DEADLOCK: |
569 | if (!proc) { | |
570 | log_print("no locking on control device"); | |
571 | goto out_sig; | |
572 | } | |
573 | error = device_user_deadlock(proc, &kbuf->i.lock); | |
574 | break; | |
575 | ||
597d0cae DT |
576 | case DLM_USER_CREATE_LOCKSPACE: |
577 | if (proc) { | |
578 | log_print("create/remove only on control device"); | |
579 | goto out_sig; | |
580 | } | |
581 | error = device_create_lockspace(&kbuf->i.lspace); | |
582 | break; | |
583 | ||
584 | case DLM_USER_REMOVE_LOCKSPACE: | |
585 | if (proc) { | |
586 | log_print("create/remove only on control device"); | |
587 | goto out_sig; | |
588 | } | |
589 | error = device_remove_lockspace(&kbuf->i.lspace); | |
590 | break; | |
591 | ||
72c2be77 DT |
592 | case DLM_USER_PURGE: |
593 | if (!proc) { | |
594 | log_print("no locking on control device"); | |
595 | goto out_sig; | |
596 | } | |
597 | error = device_user_purge(proc, &kbuf->i.purge); | |
598 | break; | |
599 | ||
597d0cae DT |
600 | default: |
601 | log_print("Unknown command passed to DLM device : %d\n", | |
602 | kbuf->cmd); | |
603 | } | |
604 | ||
605 | out_sig: | |
606 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
607 | recalc_sigpending(); | |
608 | out_free: | |
609 | kfree(kbuf); | |
610 | return error; | |
611 | } | |
612 | ||
613 | /* Every process that opens the lockspace device has its own "proc" structure | |
614 | hanging off the open file that's used to keep track of locks owned by the | |
615 | process and asts that need to be delivered to the process. */ | |
616 | ||
617 | static int device_open(struct inode *inode, struct file *file) | |
618 | { | |
619 | struct dlm_user_proc *proc; | |
620 | struct dlm_ls *ls; | |
621 | ||
514bcc66 | 622 | lock_kernel(); |
597d0cae | 623 | ls = dlm_find_lockspace_device(iminor(inode)); |
514bcc66 AB |
624 | if (!ls) { |
625 | unlock_kernel(); | |
597d0cae | 626 | return -ENOENT; |
514bcc66 | 627 | } |
597d0cae DT |
628 | |
629 | proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); | |
630 | if (!proc) { | |
631 | dlm_put_lockspace(ls); | |
514bcc66 | 632 | unlock_kernel(); |
597d0cae DT |
633 | return -ENOMEM; |
634 | } | |
635 | ||
636 | proc->lockspace = ls->ls_local_handle; | |
637 | INIT_LIST_HEAD(&proc->asts); | |
638 | INIT_LIST_HEAD(&proc->locks); | |
a1bc86e6 | 639 | INIT_LIST_HEAD(&proc->unlocking); |
597d0cae DT |
640 | spin_lock_init(&proc->asts_spin); |
641 | spin_lock_init(&proc->locks_spin); | |
642 | init_waitqueue_head(&proc->wait); | |
643 | file->private_data = proc; | |
514bcc66 | 644 | unlock_kernel(); |
597d0cae DT |
645 | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static int device_close(struct inode *inode, struct file *file) | |
650 | { | |
651 | struct dlm_user_proc *proc = file->private_data; | |
652 | struct dlm_ls *ls; | |
653 | sigset_t tmpsig, allsigs; | |
654 | ||
655 | ls = dlm_find_lockspace_local(proc->lockspace); | |
656 | if (!ls) | |
657 | return -ENOENT; | |
658 | ||
659 | sigfillset(&allsigs); | |
660 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
661 | ||
662 | set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); | |
663 | ||
664 | dlm_clear_proc_locks(ls, proc); | |
665 | ||
666 | /* at this point no more lkb's should exist for this lockspace, | |
667 | so there's no chance of dlm_user_add_ast() being called and | |
668 | looking for lkb->ua->proc */ | |
669 | ||
670 | kfree(proc); | |
671 | file->private_data = NULL; | |
672 | ||
673 | dlm_put_lockspace(ls); | |
674 | dlm_put_lockspace(ls); /* for the find in device_open() */ | |
675 | ||
676 | /* FIXME: AUTOFREE: if this ls is no longer used do | |
677 | device_remove_lockspace() */ | |
678 | ||
679 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
680 | recalc_sigpending(); | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, | |
686 | int bmode, char __user *buf, size_t count) | |
687 | { | |
688 | #ifdef CONFIG_COMPAT | |
689 | struct dlm_lock_result32 result32; | |
690 | #endif | |
691 | struct dlm_lock_result result; | |
692 | void *resultptr; | |
693 | int error=0; | |
694 | int len; | |
695 | int struct_len; | |
696 | ||
697 | memset(&result, 0, sizeof(struct dlm_lock_result)); | |
d7db923e DT |
698 | result.version[0] = DLM_DEVICE_VERSION_MAJOR; |
699 | result.version[1] = DLM_DEVICE_VERSION_MINOR; | |
700 | result.version[2] = DLM_DEVICE_VERSION_PATCH; | |
597d0cae DT |
701 | memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); |
702 | result.user_lksb = ua->user_lksb; | |
703 | ||
704 | /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated | |
705 | in a conversion unless the conversion is successful. See code | |
706 | in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, | |
707 | notes that a new blocking AST address and parameter are set even if | |
708 | the conversion fails, so maybe we should just do that. */ | |
709 | ||
710 | if (type == AST_BAST) { | |
711 | result.user_astaddr = ua->bastaddr; | |
712 | result.user_astparam = ua->bastparam; | |
713 | result.bast_mode = bmode; | |
714 | } else { | |
715 | result.user_astaddr = ua->castaddr; | |
716 | result.user_astparam = ua->castparam; | |
717 | } | |
718 | ||
719 | #ifdef CONFIG_COMPAT | |
720 | if (compat) | |
721 | len = sizeof(struct dlm_lock_result32); | |
722 | else | |
723 | #endif | |
724 | len = sizeof(struct dlm_lock_result); | |
725 | struct_len = len; | |
726 | ||
727 | /* copy lvb to userspace if there is one, it's been updated, and | |
728 | the user buffer has space for it */ | |
729 | ||
730 | if (ua->update_user_lvb && ua->lksb.sb_lvbptr && | |
731 | count >= len + DLM_USER_LVB_LEN) { | |
732 | if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, | |
733 | DLM_USER_LVB_LEN)) { | |
734 | error = -EFAULT; | |
735 | goto out; | |
736 | } | |
737 | ||
738 | result.lvb_offset = len; | |
739 | len += DLM_USER_LVB_LEN; | |
740 | } | |
741 | ||
742 | result.length = len; | |
743 | resultptr = &result; | |
744 | #ifdef CONFIG_COMPAT | |
745 | if (compat) { | |
746 | compat_output(&result, &result32); | |
747 | resultptr = &result32; | |
748 | } | |
749 | #endif | |
750 | ||
751 | if (copy_to_user(buf, resultptr, struct_len)) | |
752 | error = -EFAULT; | |
753 | else | |
754 | error = len; | |
755 | out: | |
756 | return error; | |
757 | } | |
758 | ||
d7db923e DT |
759 | static int copy_version_to_user(char __user *buf, size_t count) |
760 | { | |
761 | struct dlm_device_version ver; | |
762 | ||
763 | memset(&ver, 0, sizeof(struct dlm_device_version)); | |
764 | ver.version[0] = DLM_DEVICE_VERSION_MAJOR; | |
765 | ver.version[1] = DLM_DEVICE_VERSION_MINOR; | |
766 | ver.version[2] = DLM_DEVICE_VERSION_PATCH; | |
767 | ||
768 | if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) | |
769 | return -EFAULT; | |
770 | return sizeof(struct dlm_device_version); | |
771 | } | |
772 | ||
597d0cae DT |
773 | /* a read returns a single ast described in a struct dlm_lock_result */ |
774 | ||
775 | static ssize_t device_read(struct file *file, char __user *buf, size_t count, | |
776 | loff_t *ppos) | |
777 | { | |
778 | struct dlm_user_proc *proc = file->private_data; | |
779 | struct dlm_lkb *lkb; | |
597d0cae DT |
780 | DECLARE_WAITQUEUE(wait, current); |
781 | int error, type=0, bmode=0, removed = 0; | |
782 | ||
d7db923e DT |
783 | if (count == sizeof(struct dlm_device_version)) { |
784 | error = copy_version_to_user(buf, count); | |
785 | return error; | |
786 | } | |
787 | ||
788 | if (!proc) { | |
789 | log_print("non-version read from control device %zu", count); | |
790 | return -EINVAL; | |
791 | } | |
792 | ||
597d0cae DT |
793 | #ifdef CONFIG_COMPAT |
794 | if (count < sizeof(struct dlm_lock_result32)) | |
795 | #else | |
796 | if (count < sizeof(struct dlm_lock_result)) | |
797 | #endif | |
798 | return -EINVAL; | |
799 | ||
800 | /* do we really need this? can a read happen after a close? */ | |
801 | if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
802 | return -EINVAL; | |
803 | ||
804 | spin_lock(&proc->asts_spin); | |
805 | if (list_empty(&proc->asts)) { | |
806 | if (file->f_flags & O_NONBLOCK) { | |
807 | spin_unlock(&proc->asts_spin); | |
808 | return -EAGAIN; | |
809 | } | |
810 | ||
811 | add_wait_queue(&proc->wait, &wait); | |
812 | ||
813 | repeat: | |
814 | set_current_state(TASK_INTERRUPTIBLE); | |
815 | if (list_empty(&proc->asts) && !signal_pending(current)) { | |
816 | spin_unlock(&proc->asts_spin); | |
817 | schedule(); | |
818 | spin_lock(&proc->asts_spin); | |
819 | goto repeat; | |
820 | } | |
821 | set_current_state(TASK_RUNNING); | |
822 | remove_wait_queue(&proc->wait, &wait); | |
823 | ||
824 | if (signal_pending(current)) { | |
825 | spin_unlock(&proc->asts_spin); | |
826 | return -ERESTARTSYS; | |
827 | } | |
828 | } | |
829 | ||
597d0cae DT |
830 | /* there may be both completion and blocking asts to return for |
831 | the lkb, don't remove lkb from asts list unless no asts remain */ | |
832 | ||
833 | lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); | |
834 | ||
835 | if (lkb->lkb_ast_type & AST_COMP) { | |
836 | lkb->lkb_ast_type &= ~AST_COMP; | |
837 | type = AST_COMP; | |
838 | } else if (lkb->lkb_ast_type & AST_BAST) { | |
839 | lkb->lkb_ast_type &= ~AST_BAST; | |
840 | type = AST_BAST; | |
841 | bmode = lkb->lkb_bastmode; | |
842 | } | |
843 | ||
844 | if (!lkb->lkb_ast_type) { | |
845 | list_del(&lkb->lkb_astqueue); | |
846 | removed = 1; | |
847 | } | |
848 | spin_unlock(&proc->asts_spin); | |
849 | ||
d292c0cc | 850 | error = copy_result_to_user(lkb->lkb_ua, |
597d0cae DT |
851 | test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), |
852 | type, bmode, buf, count); | |
853 | ||
854 | /* removes reference for the proc->asts lists added by | |
855 | dlm_user_add_ast() and may result in the lkb being freed */ | |
856 | if (removed) | |
857 | dlm_put_lkb(lkb); | |
858 | ||
859 | return error; | |
860 | } | |
861 | ||
862 | static unsigned int device_poll(struct file *file, poll_table *wait) | |
863 | { | |
864 | struct dlm_user_proc *proc = file->private_data; | |
865 | ||
866 | poll_wait(file, &proc->wait, wait); | |
867 | ||
868 | spin_lock(&proc->asts_spin); | |
869 | if (!list_empty(&proc->asts)) { | |
870 | spin_unlock(&proc->asts_spin); | |
871 | return POLLIN | POLLRDNORM; | |
872 | } | |
873 | spin_unlock(&proc->asts_spin); | |
874 | return 0; | |
875 | } | |
876 | ||
877 | static int ctl_device_open(struct inode *inode, struct file *file) | |
878 | { | |
514bcc66 | 879 | cycle_kernel_lock(); |
597d0cae DT |
880 | file->private_data = NULL; |
881 | return 0; | |
882 | } | |
883 | ||
884 | static int ctl_device_close(struct inode *inode, struct file *file) | |
885 | { | |
886 | return 0; | |
887 | } | |
888 | ||
00977a59 | 889 | static const struct file_operations device_fops = { |
597d0cae DT |
890 | .open = device_open, |
891 | .release = device_close, | |
892 | .read = device_read, | |
893 | .write = device_write, | |
894 | .poll = device_poll, | |
895 | .owner = THIS_MODULE, | |
896 | }; | |
897 | ||
00977a59 | 898 | static const struct file_operations ctl_device_fops = { |
597d0cae DT |
899 | .open = ctl_device_open, |
900 | .release = ctl_device_close, | |
d7db923e | 901 | .read = device_read, |
597d0cae DT |
902 | .write = device_write, |
903 | .owner = THIS_MODULE, | |
904 | }; | |
905 | ||
0fe410d3 DC |
906 | static struct miscdevice ctl_device = { |
907 | .name = "dlm-control", | |
908 | .fops = &ctl_device_fops, | |
909 | .minor = MISC_DYNAMIC_MINOR, | |
910 | }; | |
911 | ||
30727174 | 912 | int __init dlm_user_init(void) |
597d0cae DT |
913 | { |
914 | int error; | |
915 | ||
597d0cae DT |
916 | error = misc_register(&ctl_device); |
917 | if (error) | |
918 | log_print("misc_register failed for control device"); | |
919 | ||
920 | return error; | |
921 | } | |
922 | ||
923 | void dlm_user_exit(void) | |
924 | { | |
925 | misc_deregister(&ctl_device); | |
926 | } | |
927 |