Commit | Line | Data |
---|---|---|
597d0cae | 1 | /* |
0f8e0d9a | 2 | * Copyright (C) 2006-2008 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 | ||
0f8e0d9a | 343 | static int dlm_device_register(struct dlm_ls *ls, char *name) |
254da030 PC |
344 | { |
345 | int error, len; | |
346 | ||
0f8e0d9a DT |
347 | /* The device is already registered. This happens when the |
348 | lockspace is created multiple times from userspace. */ | |
349 | if (ls->ls_device.name) | |
350 | return 0; | |
351 | ||
254da030 PC |
352 | error = -ENOMEM; |
353 | len = strlen(name) + strlen(name_prefix) + 2; | |
354 | ls->ls_device.name = kzalloc(len, GFP_KERNEL); | |
355 | if (!ls->ls_device.name) | |
356 | goto fail; | |
357 | ||
358 | snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, | |
359 | name); | |
360 | ls->ls_device.fops = &device_fops; | |
361 | ls->ls_device.minor = MISC_DYNAMIC_MINOR; | |
362 | ||
363 | error = misc_register(&ls->ls_device); | |
364 | if (error) { | |
365 | kfree(ls->ls_device.name); | |
366 | } | |
367 | fail: | |
368 | return error; | |
369 | } | |
370 | ||
0f8e0d9a DT |
371 | int dlm_device_deregister(struct dlm_ls *ls) |
372 | { | |
373 | int error; | |
374 | ||
375 | /* The device is not registered. This happens when the lockspace | |
376 | was never used from userspace, or when device_create_lockspace() | |
377 | calls dlm_release_lockspace() after the register fails. */ | |
378 | if (!ls->ls_device.name) | |
379 | return 0; | |
380 | ||
381 | error = misc_deregister(&ls->ls_device); | |
382 | if (!error) | |
383 | kfree(ls->ls_device.name); | |
384 | return error; | |
385 | } | |
386 | ||
72c2be77 DT |
387 | static int device_user_purge(struct dlm_user_proc *proc, |
388 | struct dlm_purge_params *params) | |
389 | { | |
390 | struct dlm_ls *ls; | |
391 | int error; | |
392 | ||
393 | ls = dlm_find_lockspace_local(proc->lockspace); | |
394 | if (!ls) | |
395 | return -ENOENT; | |
396 | ||
397 | error = dlm_user_purge(ls, proc, params->nodeid, params->pid); | |
398 | ||
399 | dlm_put_lockspace(ls); | |
400 | return error; | |
401 | } | |
402 | ||
597d0cae DT |
403 | static int device_create_lockspace(struct dlm_lspace_params *params) |
404 | { | |
405 | dlm_lockspace_t *lockspace; | |
406 | struct dlm_ls *ls; | |
254da030 | 407 | int error; |
597d0cae DT |
408 | |
409 | if (!capable(CAP_SYS_ADMIN)) | |
410 | return -EPERM; | |
411 | ||
412 | error = dlm_new_lockspace(params->name, strlen(params->name), | |
3ae1acf9 | 413 | &lockspace, params->flags, DLM_USER_LVB_LEN); |
597d0cae DT |
414 | if (error) |
415 | return error; | |
416 | ||
417 | ls = dlm_find_lockspace_local(lockspace); | |
418 | if (!ls) | |
419 | return -ENOENT; | |
420 | ||
0f8e0d9a | 421 | error = dlm_device_register(ls, params->name); |
597d0cae | 422 | dlm_put_lockspace(ls); |
597d0cae | 423 | |
254da030 PC |
424 | if (error) |
425 | dlm_release_lockspace(lockspace, 0); | |
426 | else | |
427 | error = ls->ls_device.minor; | |
428 | ||
597d0cae DT |
429 | return error; |
430 | } | |
431 | ||
432 | static int device_remove_lockspace(struct dlm_lspace_params *params) | |
433 | { | |
434 | dlm_lockspace_t *lockspace; | |
435 | struct dlm_ls *ls; | |
c6e6f0ba | 436 | int error, force = 0; |
597d0cae DT |
437 | |
438 | if (!capable(CAP_SYS_ADMIN)) | |
439 | return -EPERM; | |
440 | ||
441 | ls = dlm_find_lockspace_device(params->minor); | |
442 | if (!ls) | |
443 | return -ENOENT; | |
444 | ||
c6e6f0ba DT |
445 | if (params->flags & DLM_USER_LSFLG_FORCEFREE) |
446 | force = 2; | |
447 | ||
597d0cae | 448 | lockspace = ls->ls_local_handle; |
0f8e0d9a | 449 | dlm_put_lockspace(ls); |
597d0cae | 450 | |
0f8e0d9a DT |
451 | /* The final dlm_release_lockspace waits for references to go to |
452 | zero, so all processes will need to close their device for the | |
453 | ls before the release will proceed. release also calls the | |
454 | device_deregister above. Converting a positive return value | |
455 | from release to zero means that userspace won't know when its | |
456 | release was the final one, but it shouldn't need to know. */ | |
597d0cae | 457 | |
c6e6f0ba | 458 | error = dlm_release_lockspace(lockspace, force); |
0f8e0d9a DT |
459 | if (error > 0) |
460 | error = 0; | |
597d0cae DT |
461 | return error; |
462 | } | |
463 | ||
464 | /* Check the user's version matches ours */ | |
465 | static int check_version(struct dlm_write_request *req) | |
466 | { | |
467 | if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || | |
468 | (req->version[0] == DLM_DEVICE_VERSION_MAJOR && | |
469 | req->version[1] > DLM_DEVICE_VERSION_MINOR)) { | |
470 | ||
471 | printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " | |
472 | "user (%d.%d.%d) kernel (%d.%d.%d)\n", | |
473 | current->comm, | |
ba25f9dc | 474 | task_pid_nr(current), |
597d0cae DT |
475 | req->version[0], |
476 | req->version[1], | |
477 | req->version[2], | |
478 | DLM_DEVICE_VERSION_MAJOR, | |
479 | DLM_DEVICE_VERSION_MINOR, | |
480 | DLM_DEVICE_VERSION_PATCH); | |
481 | return -EINVAL; | |
482 | } | |
483 | return 0; | |
484 | } | |
485 | ||
486 | /* | |
487 | * device_write | |
488 | * | |
489 | * device_user_lock | |
490 | * dlm_user_request -> request_lock | |
491 | * dlm_user_convert -> convert_lock | |
492 | * | |
493 | * device_user_unlock | |
494 | * dlm_user_unlock -> unlock_lock | |
495 | * dlm_user_cancel -> cancel_lock | |
496 | * | |
497 | * device_create_lockspace | |
498 | * dlm_new_lockspace | |
499 | * | |
500 | * device_remove_lockspace | |
501 | * dlm_release_lockspace | |
502 | */ | |
503 | ||
504 | /* a write to a lockspace device is a lock or unlock request, a write | |
505 | to the control device is to create/remove a lockspace */ | |
506 | ||
507 | static ssize_t device_write(struct file *file, const char __user *buf, | |
508 | size_t count, loff_t *ppos) | |
509 | { | |
510 | struct dlm_user_proc *proc = file->private_data; | |
511 | struct dlm_write_request *kbuf; | |
512 | sigset_t tmpsig, allsigs; | |
513 | int error; | |
514 | ||
515 | #ifdef CONFIG_COMPAT | |
516 | if (count < sizeof(struct dlm_write_request32)) | |
517 | #else | |
518 | if (count < sizeof(struct dlm_write_request)) | |
519 | #endif | |
520 | return -EINVAL; | |
521 | ||
cb79f199 | 522 | kbuf = kzalloc(count + 1, GFP_KERNEL); |
597d0cae DT |
523 | if (!kbuf) |
524 | return -ENOMEM; | |
525 | ||
526 | if (copy_from_user(kbuf, buf, count)) { | |
527 | error = -EFAULT; | |
528 | goto out_free; | |
529 | } | |
530 | ||
531 | if (check_version(kbuf)) { | |
532 | error = -EBADE; | |
533 | goto out_free; | |
534 | } | |
535 | ||
536 | #ifdef CONFIG_COMPAT | |
537 | if (!kbuf->is64bit) { | |
538 | struct dlm_write_request32 *k32buf; | |
539 | k32buf = (struct dlm_write_request32 *)kbuf; | |
cb79f199 | 540 | kbuf = kmalloc(count + 1 + (sizeof(struct dlm_write_request) - |
597d0cae | 541 | sizeof(struct dlm_write_request32)), GFP_KERNEL); |
cb980d9a DT |
542 | if (!kbuf) { |
543 | kfree(k32buf); | |
597d0cae | 544 | return -ENOMEM; |
cb980d9a | 545 | } |
597d0cae DT |
546 | |
547 | if (proc) | |
548 | set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); | |
cb79f199 | 549 | compat_input(kbuf, k32buf, count + 1); |
597d0cae DT |
550 | kfree(k32buf); |
551 | } | |
552 | #endif | |
553 | ||
554 | /* do we really need this? can a write happen after a close? */ | |
555 | if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && | |
cb980d9a DT |
556 | (proc && test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags))) { |
557 | error = -EINVAL; | |
558 | goto out_free; | |
559 | } | |
597d0cae DT |
560 | |
561 | sigfillset(&allsigs); | |
562 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
563 | ||
564 | error = -EINVAL; | |
565 | ||
566 | switch (kbuf->cmd) | |
567 | { | |
568 | case DLM_USER_LOCK: | |
569 | if (!proc) { | |
570 | log_print("no locking on control device"); | |
571 | goto out_sig; | |
572 | } | |
573 | error = device_user_lock(proc, &kbuf->i.lock); | |
574 | break; | |
575 | ||
576 | case DLM_USER_UNLOCK: | |
577 | if (!proc) { | |
578 | log_print("no locking on control device"); | |
579 | goto out_sig; | |
580 | } | |
581 | error = device_user_unlock(proc, &kbuf->i.lock); | |
582 | break; | |
583 | ||
8b4021fa DT |
584 | case DLM_USER_DEADLOCK: |
585 | if (!proc) { | |
586 | log_print("no locking on control device"); | |
587 | goto out_sig; | |
588 | } | |
589 | error = device_user_deadlock(proc, &kbuf->i.lock); | |
590 | break; | |
591 | ||
597d0cae DT |
592 | case DLM_USER_CREATE_LOCKSPACE: |
593 | if (proc) { | |
594 | log_print("create/remove only on control device"); | |
595 | goto out_sig; | |
596 | } | |
597 | error = device_create_lockspace(&kbuf->i.lspace); | |
598 | break; | |
599 | ||
600 | case DLM_USER_REMOVE_LOCKSPACE: | |
601 | if (proc) { | |
602 | log_print("create/remove only on control device"); | |
603 | goto out_sig; | |
604 | } | |
605 | error = device_remove_lockspace(&kbuf->i.lspace); | |
606 | break; | |
607 | ||
72c2be77 DT |
608 | case DLM_USER_PURGE: |
609 | if (!proc) { | |
610 | log_print("no locking on control device"); | |
611 | goto out_sig; | |
612 | } | |
613 | error = device_user_purge(proc, &kbuf->i.purge); | |
614 | break; | |
615 | ||
597d0cae DT |
616 | default: |
617 | log_print("Unknown command passed to DLM device : %d\n", | |
618 | kbuf->cmd); | |
619 | } | |
620 | ||
621 | out_sig: | |
622 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
623 | recalc_sigpending(); | |
624 | out_free: | |
625 | kfree(kbuf); | |
626 | return error; | |
627 | } | |
628 | ||
629 | /* Every process that opens the lockspace device has its own "proc" structure | |
630 | hanging off the open file that's used to keep track of locks owned by the | |
631 | process and asts that need to be delivered to the process. */ | |
632 | ||
633 | static int device_open(struct inode *inode, struct file *file) | |
634 | { | |
635 | struct dlm_user_proc *proc; | |
636 | struct dlm_ls *ls; | |
637 | ||
514bcc66 | 638 | lock_kernel(); |
597d0cae | 639 | ls = dlm_find_lockspace_device(iminor(inode)); |
514bcc66 AB |
640 | if (!ls) { |
641 | unlock_kernel(); | |
597d0cae | 642 | return -ENOENT; |
514bcc66 | 643 | } |
597d0cae DT |
644 | |
645 | proc = kzalloc(sizeof(struct dlm_user_proc), GFP_KERNEL); | |
646 | if (!proc) { | |
647 | dlm_put_lockspace(ls); | |
514bcc66 | 648 | unlock_kernel(); |
597d0cae DT |
649 | return -ENOMEM; |
650 | } | |
651 | ||
652 | proc->lockspace = ls->ls_local_handle; | |
653 | INIT_LIST_HEAD(&proc->asts); | |
654 | INIT_LIST_HEAD(&proc->locks); | |
a1bc86e6 | 655 | INIT_LIST_HEAD(&proc->unlocking); |
597d0cae DT |
656 | spin_lock_init(&proc->asts_spin); |
657 | spin_lock_init(&proc->locks_spin); | |
658 | init_waitqueue_head(&proc->wait); | |
659 | file->private_data = proc; | |
514bcc66 | 660 | unlock_kernel(); |
597d0cae DT |
661 | |
662 | return 0; | |
663 | } | |
664 | ||
665 | static int device_close(struct inode *inode, struct file *file) | |
666 | { | |
667 | struct dlm_user_proc *proc = file->private_data; | |
668 | struct dlm_ls *ls; | |
669 | sigset_t tmpsig, allsigs; | |
670 | ||
671 | ls = dlm_find_lockspace_local(proc->lockspace); | |
672 | if (!ls) | |
673 | return -ENOENT; | |
674 | ||
675 | sigfillset(&allsigs); | |
676 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
677 | ||
678 | set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); | |
679 | ||
680 | dlm_clear_proc_locks(ls, proc); | |
681 | ||
682 | /* at this point no more lkb's should exist for this lockspace, | |
683 | so there's no chance of dlm_user_add_ast() being called and | |
684 | looking for lkb->ua->proc */ | |
685 | ||
686 | kfree(proc); | |
687 | file->private_data = NULL; | |
688 | ||
689 | dlm_put_lockspace(ls); | |
690 | dlm_put_lockspace(ls); /* for the find in device_open() */ | |
691 | ||
692 | /* FIXME: AUTOFREE: if this ls is no longer used do | |
693 | device_remove_lockspace() */ | |
694 | ||
695 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
696 | recalc_sigpending(); | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, | |
702 | int bmode, char __user *buf, size_t count) | |
703 | { | |
704 | #ifdef CONFIG_COMPAT | |
705 | struct dlm_lock_result32 result32; | |
706 | #endif | |
707 | struct dlm_lock_result result; | |
708 | void *resultptr; | |
709 | int error=0; | |
710 | int len; | |
711 | int struct_len; | |
712 | ||
713 | memset(&result, 0, sizeof(struct dlm_lock_result)); | |
d7db923e DT |
714 | result.version[0] = DLM_DEVICE_VERSION_MAJOR; |
715 | result.version[1] = DLM_DEVICE_VERSION_MINOR; | |
716 | result.version[2] = DLM_DEVICE_VERSION_PATCH; | |
597d0cae DT |
717 | memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); |
718 | result.user_lksb = ua->user_lksb; | |
719 | ||
720 | /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated | |
721 | in a conversion unless the conversion is successful. See code | |
722 | in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, | |
723 | notes that a new blocking AST address and parameter are set even if | |
724 | the conversion fails, so maybe we should just do that. */ | |
725 | ||
726 | if (type == AST_BAST) { | |
727 | result.user_astaddr = ua->bastaddr; | |
728 | result.user_astparam = ua->bastparam; | |
729 | result.bast_mode = bmode; | |
730 | } else { | |
731 | result.user_astaddr = ua->castaddr; | |
732 | result.user_astparam = ua->castparam; | |
733 | } | |
734 | ||
735 | #ifdef CONFIG_COMPAT | |
736 | if (compat) | |
737 | len = sizeof(struct dlm_lock_result32); | |
738 | else | |
739 | #endif | |
740 | len = sizeof(struct dlm_lock_result); | |
741 | struct_len = len; | |
742 | ||
743 | /* copy lvb to userspace if there is one, it's been updated, and | |
744 | the user buffer has space for it */ | |
745 | ||
746 | if (ua->update_user_lvb && ua->lksb.sb_lvbptr && | |
747 | count >= len + DLM_USER_LVB_LEN) { | |
748 | if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, | |
749 | DLM_USER_LVB_LEN)) { | |
750 | error = -EFAULT; | |
751 | goto out; | |
752 | } | |
753 | ||
754 | result.lvb_offset = len; | |
755 | len += DLM_USER_LVB_LEN; | |
756 | } | |
757 | ||
758 | result.length = len; | |
759 | resultptr = &result; | |
760 | #ifdef CONFIG_COMPAT | |
761 | if (compat) { | |
762 | compat_output(&result, &result32); | |
763 | resultptr = &result32; | |
764 | } | |
765 | #endif | |
766 | ||
767 | if (copy_to_user(buf, resultptr, struct_len)) | |
768 | error = -EFAULT; | |
769 | else | |
770 | error = len; | |
771 | out: | |
772 | return error; | |
773 | } | |
774 | ||
d7db923e DT |
775 | static int copy_version_to_user(char __user *buf, size_t count) |
776 | { | |
777 | struct dlm_device_version ver; | |
778 | ||
779 | memset(&ver, 0, sizeof(struct dlm_device_version)); | |
780 | ver.version[0] = DLM_DEVICE_VERSION_MAJOR; | |
781 | ver.version[1] = DLM_DEVICE_VERSION_MINOR; | |
782 | ver.version[2] = DLM_DEVICE_VERSION_PATCH; | |
783 | ||
784 | if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) | |
785 | return -EFAULT; | |
786 | return sizeof(struct dlm_device_version); | |
787 | } | |
788 | ||
597d0cae DT |
789 | /* a read returns a single ast described in a struct dlm_lock_result */ |
790 | ||
791 | static ssize_t device_read(struct file *file, char __user *buf, size_t count, | |
792 | loff_t *ppos) | |
793 | { | |
794 | struct dlm_user_proc *proc = file->private_data; | |
795 | struct dlm_lkb *lkb; | |
597d0cae DT |
796 | DECLARE_WAITQUEUE(wait, current); |
797 | int error, type=0, bmode=0, removed = 0; | |
798 | ||
d7db923e DT |
799 | if (count == sizeof(struct dlm_device_version)) { |
800 | error = copy_version_to_user(buf, count); | |
801 | return error; | |
802 | } | |
803 | ||
804 | if (!proc) { | |
805 | log_print("non-version read from control device %zu", count); | |
806 | return -EINVAL; | |
807 | } | |
808 | ||
597d0cae DT |
809 | #ifdef CONFIG_COMPAT |
810 | if (count < sizeof(struct dlm_lock_result32)) | |
811 | #else | |
812 | if (count < sizeof(struct dlm_lock_result)) | |
813 | #endif | |
814 | return -EINVAL; | |
815 | ||
816 | /* do we really need this? can a read happen after a close? */ | |
817 | if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
818 | return -EINVAL; | |
819 | ||
820 | spin_lock(&proc->asts_spin); | |
821 | if (list_empty(&proc->asts)) { | |
822 | if (file->f_flags & O_NONBLOCK) { | |
823 | spin_unlock(&proc->asts_spin); | |
824 | return -EAGAIN; | |
825 | } | |
826 | ||
827 | add_wait_queue(&proc->wait, &wait); | |
828 | ||
829 | repeat: | |
830 | set_current_state(TASK_INTERRUPTIBLE); | |
831 | if (list_empty(&proc->asts) && !signal_pending(current)) { | |
832 | spin_unlock(&proc->asts_spin); | |
833 | schedule(); | |
834 | spin_lock(&proc->asts_spin); | |
835 | goto repeat; | |
836 | } | |
837 | set_current_state(TASK_RUNNING); | |
838 | remove_wait_queue(&proc->wait, &wait); | |
839 | ||
840 | if (signal_pending(current)) { | |
841 | spin_unlock(&proc->asts_spin); | |
842 | return -ERESTARTSYS; | |
843 | } | |
844 | } | |
845 | ||
597d0cae DT |
846 | /* there may be both completion and blocking asts to return for |
847 | the lkb, don't remove lkb from asts list unless no asts remain */ | |
848 | ||
849 | lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); | |
850 | ||
851 | if (lkb->lkb_ast_type & AST_COMP) { | |
852 | lkb->lkb_ast_type &= ~AST_COMP; | |
853 | type = AST_COMP; | |
854 | } else if (lkb->lkb_ast_type & AST_BAST) { | |
855 | lkb->lkb_ast_type &= ~AST_BAST; | |
856 | type = AST_BAST; | |
857 | bmode = lkb->lkb_bastmode; | |
858 | } | |
859 | ||
860 | if (!lkb->lkb_ast_type) { | |
861 | list_del(&lkb->lkb_astqueue); | |
862 | removed = 1; | |
863 | } | |
864 | spin_unlock(&proc->asts_spin); | |
865 | ||
d292c0cc | 866 | error = copy_result_to_user(lkb->lkb_ua, |
597d0cae DT |
867 | test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), |
868 | type, bmode, buf, count); | |
869 | ||
870 | /* removes reference for the proc->asts lists added by | |
871 | dlm_user_add_ast() and may result in the lkb being freed */ | |
872 | if (removed) | |
873 | dlm_put_lkb(lkb); | |
874 | ||
875 | return error; | |
876 | } | |
877 | ||
878 | static unsigned int device_poll(struct file *file, poll_table *wait) | |
879 | { | |
880 | struct dlm_user_proc *proc = file->private_data; | |
881 | ||
882 | poll_wait(file, &proc->wait, wait); | |
883 | ||
884 | spin_lock(&proc->asts_spin); | |
885 | if (!list_empty(&proc->asts)) { | |
886 | spin_unlock(&proc->asts_spin); | |
887 | return POLLIN | POLLRDNORM; | |
888 | } | |
889 | spin_unlock(&proc->asts_spin); | |
890 | return 0; | |
891 | } | |
892 | ||
893 | static int ctl_device_open(struct inode *inode, struct file *file) | |
894 | { | |
514bcc66 | 895 | cycle_kernel_lock(); |
597d0cae DT |
896 | file->private_data = NULL; |
897 | return 0; | |
898 | } | |
899 | ||
900 | static int ctl_device_close(struct inode *inode, struct file *file) | |
901 | { | |
902 | return 0; | |
903 | } | |
904 | ||
00977a59 | 905 | static const struct file_operations device_fops = { |
597d0cae DT |
906 | .open = device_open, |
907 | .release = device_close, | |
908 | .read = device_read, | |
909 | .write = device_write, | |
910 | .poll = device_poll, | |
911 | .owner = THIS_MODULE, | |
912 | }; | |
913 | ||
00977a59 | 914 | static const struct file_operations ctl_device_fops = { |
597d0cae DT |
915 | .open = ctl_device_open, |
916 | .release = ctl_device_close, | |
d7db923e | 917 | .read = device_read, |
597d0cae DT |
918 | .write = device_write, |
919 | .owner = THIS_MODULE, | |
920 | }; | |
921 | ||
0fe410d3 DC |
922 | static struct miscdevice ctl_device = { |
923 | .name = "dlm-control", | |
924 | .fops = &ctl_device_fops, | |
925 | .minor = MISC_DYNAMIC_MINOR, | |
926 | }; | |
927 | ||
30727174 | 928 | int __init dlm_user_init(void) |
597d0cae DT |
929 | { |
930 | int error; | |
931 | ||
597d0cae DT |
932 | error = misc_register(&ctl_device); |
933 | if (error) | |
934 | log_print("misc_register failed for control device"); | |
935 | ||
936 | return error; | |
937 | } | |
938 | ||
939 | void dlm_user_exit(void) | |
940 | { | |
941 | misc_deregister(&ctl_device); | |
942 | } | |
943 |