Commit | Line | Data |
---|---|---|
597d0cae | 1 | /* |
7fe2b319 | 2 | * Copyright (C) 2006-2010 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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
597d0cae DT |
21 | |
22 | #include "dlm_internal.h" | |
23 | #include "lockspace.h" | |
24 | #include "lock.h" | |
25 | #include "lvb_table.h" | |
84c6e8cd | 26 | #include "user.h" |
8304d6f2 | 27 | #include "ast.h" |
597d0cae | 28 | |
0fe410d3 | 29 | static const char name_prefix[] = "dlm"; |
00977a59 | 30 | static const struct file_operations device_fops; |
dc68c7ed DT |
31 | static atomic_t dlm_monitor_opened; |
32 | static int dlm_monitor_unused = 1; | |
597d0cae DT |
33 | |
34 | #ifdef CONFIG_COMPAT | |
35 | ||
36 | struct dlm_lock_params32 { | |
37 | __u8 mode; | |
38 | __u8 namelen; | |
d7db923e DT |
39 | __u16 unused; |
40 | __u32 flags; | |
597d0cae DT |
41 | __u32 lkid; |
42 | __u32 parent; | |
d7db923e DT |
43 | __u64 xid; |
44 | __u64 timeout; | |
597d0cae DT |
45 | __u32 castparam; |
46 | __u32 castaddr; | |
47 | __u32 bastparam; | |
48 | __u32 bastaddr; | |
49 | __u32 lksb; | |
597d0cae DT |
50 | char lvb[DLM_USER_LVB_LEN]; |
51 | char name[0]; | |
52 | }; | |
53 | ||
54 | struct dlm_write_request32 { | |
55 | __u32 version[3]; | |
56 | __u8 cmd; | |
57 | __u8 is64bit; | |
58 | __u8 unused[2]; | |
59 | ||
60 | union { | |
61 | struct dlm_lock_params32 lock; | |
62 | struct dlm_lspace_params lspace; | |
72c2be77 | 63 | struct dlm_purge_params purge; |
597d0cae DT |
64 | } i; |
65 | }; | |
66 | ||
67 | struct dlm_lksb32 { | |
68 | __u32 sb_status; | |
69 | __u32 sb_lkid; | |
70 | __u8 sb_flags; | |
71 | __u32 sb_lvbptr; | |
72 | }; | |
73 | ||
74 | struct dlm_lock_result32 { | |
d7db923e | 75 | __u32 version[3]; |
597d0cae DT |
76 | __u32 length; |
77 | __u32 user_astaddr; | |
78 | __u32 user_astparam; | |
79 | __u32 user_lksb; | |
80 | struct dlm_lksb32 lksb; | |
81 | __u8 bast_mode; | |
82 | __u8 unused[3]; | |
83 | /* Offsets may be zero if no data is present */ | |
84 | __u32 lvb_offset; | |
85 | }; | |
86 | ||
87 | static void compat_input(struct dlm_write_request *kb, | |
2a79289e | 88 | struct dlm_write_request32 *kb32, |
1fecb1c4 | 89 | int namelen) |
597d0cae DT |
90 | { |
91 | kb->version[0] = kb32->version[0]; | |
92 | kb->version[1] = kb32->version[1]; | |
93 | kb->version[2] = kb32->version[2]; | |
94 | ||
95 | kb->cmd = kb32->cmd; | |
96 | kb->is64bit = kb32->is64bit; | |
97 | if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || | |
98 | kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { | |
99 | kb->i.lspace.flags = kb32->i.lspace.flags; | |
100 | kb->i.lspace.minor = kb32->i.lspace.minor; | |
1fecb1c4 | 101 | memcpy(kb->i.lspace.name, kb32->i.lspace.name, namelen); |
72c2be77 DT |
102 | } else if (kb->cmd == DLM_USER_PURGE) { |
103 | kb->i.purge.nodeid = kb32->i.purge.nodeid; | |
104 | kb->i.purge.pid = kb32->i.purge.pid; | |
597d0cae DT |
105 | } else { |
106 | kb->i.lock.mode = kb32->i.lock.mode; | |
107 | kb->i.lock.namelen = kb32->i.lock.namelen; | |
108 | kb->i.lock.flags = kb32->i.lock.flags; | |
109 | kb->i.lock.lkid = kb32->i.lock.lkid; | |
110 | kb->i.lock.parent = kb32->i.lock.parent; | |
d7db923e DT |
111 | kb->i.lock.xid = kb32->i.lock.xid; |
112 | kb->i.lock.timeout = kb32->i.lock.timeout; | |
597d0cae DT |
113 | kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; |
114 | kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; | |
115 | kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; | |
116 | kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; | |
117 | kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; | |
118 | memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); | |
1fecb1c4 | 119 | memcpy(kb->i.lock.name, kb32->i.lock.name, namelen); |
597d0cae DT |
120 | } |
121 | } | |
122 | ||
123 | static void compat_output(struct dlm_lock_result *res, | |
124 | struct dlm_lock_result32 *res32) | |
125 | { | |
d7db923e DT |
126 | res32->version[0] = res->version[0]; |
127 | res32->version[1] = res->version[1]; | |
128 | res32->version[2] = res->version[2]; | |
129 | ||
597d0cae DT |
130 | res32->user_astaddr = (__u32)(long)res->user_astaddr; |
131 | res32->user_astparam = (__u32)(long)res->user_astparam; | |
132 | res32->user_lksb = (__u32)(long)res->user_lksb; | |
133 | res32->bast_mode = res->bast_mode; | |
134 | ||
135 | res32->lvb_offset = res->lvb_offset; | |
136 | res32->length = res->length; | |
137 | ||
138 | res32->lksb.sb_status = res->lksb.sb_status; | |
139 | res32->lksb.sb_flags = res->lksb.sb_flags; | |
140 | res32->lksb.sb_lkid = res->lksb.sb_lkid; | |
141 | res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; | |
142 | } | |
143 | #endif | |
144 | ||
84d8cd69 DT |
145 | /* Figure out if this lock is at the end of its life and no longer |
146 | available for the application to use. The lkb still exists until | |
147 | the final ast is read. A lock becomes EOL in three situations: | |
148 | 1. a noqueue request fails with EAGAIN | |
149 | 2. an unlock completes with EUNLOCK | |
150 | 3. a cancel of a waiting request completes with ECANCEL/EDEADLK | |
151 | An EOL lock needs to be removed from the process's list of locks. | |
152 | And we can't allow any new operation on an EOL lock. This is | |
153 | not related to the lifetime of the lkb struct which is managed | |
154 | entirely by refcount. */ | |
155 | ||
8304d6f2 | 156 | static int lkb_is_endoflife(int mode, int status) |
84d8cd69 | 157 | { |
8304d6f2 | 158 | switch (status) { |
84d8cd69 DT |
159 | case -DLM_EUNLOCK: |
160 | return 1; | |
161 | case -DLM_ECANCEL: | |
162 | case -ETIMEDOUT: | |
8b4021fa | 163 | case -EDEADLK: |
84d8cd69 | 164 | case -EAGAIN: |
8304d6f2 | 165 | if (mode == DLM_LOCK_IV) |
84d8cd69 DT |
166 | return 1; |
167 | break; | |
168 | } | |
169 | return 0; | |
170 | } | |
171 | ||
ef0c2bb0 DT |
172 | /* we could possibly check if the cancel of an orphan has resulted in the lkb |
173 | being removed and then remove that lkb from the orphans list and free it */ | |
597d0cae | 174 | |
8304d6f2 DT |
175 | void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, |
176 | int status, uint32_t sbflags, uint64_t seq) | |
597d0cae DT |
177 | { |
178 | struct dlm_ls *ls; | |
179 | struct dlm_user_args *ua; | |
180 | struct dlm_user_proc *proc; | |
8304d6f2 | 181 | int rv; |
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 | 197 | |
d292c0cc DT |
198 | DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb);); |
199 | ua = lkb->lkb_ua; | |
597d0cae DT |
200 | proc = ua->proc; |
201 | ||
8304d6f2 | 202 | if ((flags & DLM_CB_BAST) && ua->bastaddr == NULL) |
597d0cae DT |
203 | goto out; |
204 | ||
8304d6f2 DT |
205 | if ((flags & DLM_CB_CAST) && lkb_is_endoflife(mode, status)) |
206 | lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; | |
207 | ||
597d0cae | 208 | spin_lock(&proc->asts_spin); |
ef0c2bb0 | 209 | |
8304d6f2 DT |
210 | rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, seq); |
211 | if (rv < 0) { | |
212 | spin_unlock(&proc->asts_spin); | |
213 | goto out; | |
214 | } | |
ef0c2bb0 | 215 | |
8304d6f2 | 216 | if (list_empty(&lkb->lkb_astqueue)) { |
597d0cae DT |
217 | kref_get(&lkb->lkb_ref); |
218 | list_add_tail(&lkb->lkb_astqueue, &proc->asts); | |
597d0cae DT |
219 | wake_up_interruptible(&proc->wait); |
220 | } | |
597d0cae | 221 | spin_unlock(&proc->asts_spin); |
34e22bed | 222 | |
8304d6f2 DT |
223 | if (lkb->lkb_flags & DLM_IFL_ENDOFLIFE) { |
224 | /* N.B. spin_lock locks_spin, not asts_spin */ | |
ce5246b9 | 225 | spin_lock(&proc->locks_spin); |
ef0c2bb0 DT |
226 | if (!list_empty(&lkb->lkb_ownqueue)) { |
227 | list_del_init(&lkb->lkb_ownqueue); | |
228 | dlm_put_lkb(lkb); | |
229 | } | |
ce5246b9 | 230 | spin_unlock(&proc->locks_spin); |
34e22bed | 231 | } |
597d0cae DT |
232 | out: |
233 | mutex_unlock(&ls->ls_clear_proc_locks); | |
234 | } | |
235 | ||
236 | static int device_user_lock(struct dlm_user_proc *proc, | |
237 | struct dlm_lock_params *params) | |
238 | { | |
239 | struct dlm_ls *ls; | |
240 | struct dlm_user_args *ua; | |
241 | int error = -ENOMEM; | |
242 | ||
243 | ls = dlm_find_lockspace_local(proc->lockspace); | |
244 | if (!ls) | |
245 | return -ENOENT; | |
246 | ||
247 | if (!params->castaddr || !params->lksb) { | |
248 | error = -EINVAL; | |
249 | goto out; | |
250 | } | |
251 | ||
573c24c4 | 252 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_NOFS); |
597d0cae DT |
253 | if (!ua) |
254 | goto out; | |
255 | ua->proc = proc; | |
256 | ua->user_lksb = params->lksb; | |
257 | ua->castparam = params->castparam; | |
258 | ua->castaddr = params->castaddr; | |
259 | ua->bastparam = params->bastparam; | |
260 | ua->bastaddr = params->bastaddr; | |
d7db923e | 261 | ua->xid = params->xid; |
597d0cae DT |
262 | |
263 | if (params->flags & DLM_LKF_CONVERT) | |
264 | error = dlm_user_convert(ls, ua, | |
265 | params->mode, params->flags, | |
d7db923e DT |
266 | params->lkid, params->lvb, |
267 | (unsigned long) params->timeout); | |
597d0cae DT |
268 | else { |
269 | error = dlm_user_request(ls, ua, | |
270 | params->mode, params->flags, | |
271 | params->name, params->namelen, | |
d7db923e | 272 | (unsigned long) params->timeout); |
597d0cae DT |
273 | if (!error) |
274 | error = ua->lksb.sb_lkid; | |
275 | } | |
276 | out: | |
277 | dlm_put_lockspace(ls); | |
278 | return error; | |
279 | } | |
280 | ||
281 | static int device_user_unlock(struct dlm_user_proc *proc, | |
282 | struct dlm_lock_params *params) | |
283 | { | |
284 | struct dlm_ls *ls; | |
285 | struct dlm_user_args *ua; | |
286 | int error = -ENOMEM; | |
287 | ||
288 | ls = dlm_find_lockspace_local(proc->lockspace); | |
289 | if (!ls) | |
290 | return -ENOENT; | |
291 | ||
573c24c4 | 292 | ua = kzalloc(sizeof(struct dlm_user_args), GFP_NOFS); |
597d0cae DT |
293 | if (!ua) |
294 | goto out; | |
295 | ua->proc = proc; | |
296 | ua->user_lksb = params->lksb; | |
297 | ua->castparam = params->castparam; | |
298 | ua->castaddr = params->castaddr; | |
299 | ||
300 | if (params->flags & DLM_LKF_CANCEL) | |
301 | error = dlm_user_cancel(ls, ua, params->flags, params->lkid); | |
302 | else | |
303 | error = dlm_user_unlock(ls, ua, params->flags, params->lkid, | |
304 | params->lvb); | |
305 | out: | |
306 | dlm_put_lockspace(ls); | |
307 | return error; | |
308 | } | |
309 | ||
8b4021fa DT |
310 | static int device_user_deadlock(struct dlm_user_proc *proc, |
311 | struct dlm_lock_params *params) | |
312 | { | |
313 | struct dlm_ls *ls; | |
314 | int error; | |
315 | ||
316 | ls = dlm_find_lockspace_local(proc->lockspace); | |
317 | if (!ls) | |
318 | return -ENOENT; | |
319 | ||
320 | error = dlm_user_deadlock(ls, params->flags, params->lkid); | |
321 | ||
322 | dlm_put_lockspace(ls); | |
323 | return error; | |
324 | } | |
325 | ||
0f8e0d9a | 326 | static int dlm_device_register(struct dlm_ls *ls, char *name) |
254da030 PC |
327 | { |
328 | int error, len; | |
329 | ||
0f8e0d9a DT |
330 | /* The device is already registered. This happens when the |
331 | lockspace is created multiple times from userspace. */ | |
332 | if (ls->ls_device.name) | |
333 | return 0; | |
334 | ||
254da030 PC |
335 | error = -ENOMEM; |
336 | len = strlen(name) + strlen(name_prefix) + 2; | |
573c24c4 | 337 | ls->ls_device.name = kzalloc(len, GFP_NOFS); |
254da030 PC |
338 | if (!ls->ls_device.name) |
339 | goto fail; | |
340 | ||
341 | snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, | |
342 | name); | |
343 | ls->ls_device.fops = &device_fops; | |
344 | ls->ls_device.minor = MISC_DYNAMIC_MINOR; | |
345 | ||
346 | error = misc_register(&ls->ls_device); | |
347 | if (error) { | |
348 | kfree(ls->ls_device.name); | |
349 | } | |
350 | fail: | |
351 | return error; | |
352 | } | |
353 | ||
0f8e0d9a DT |
354 | int dlm_device_deregister(struct dlm_ls *ls) |
355 | { | |
356 | int error; | |
357 | ||
358 | /* The device is not registered. This happens when the lockspace | |
359 | was never used from userspace, or when device_create_lockspace() | |
360 | calls dlm_release_lockspace() after the register fails. */ | |
361 | if (!ls->ls_device.name) | |
362 | return 0; | |
363 | ||
364 | error = misc_deregister(&ls->ls_device); | |
365 | if (!error) | |
366 | kfree(ls->ls_device.name); | |
367 | return error; | |
368 | } | |
369 | ||
72c2be77 DT |
370 | static int device_user_purge(struct dlm_user_proc *proc, |
371 | struct dlm_purge_params *params) | |
372 | { | |
373 | struct dlm_ls *ls; | |
374 | int error; | |
375 | ||
376 | ls = dlm_find_lockspace_local(proc->lockspace); | |
377 | if (!ls) | |
378 | return -ENOENT; | |
379 | ||
380 | error = dlm_user_purge(ls, proc, params->nodeid, params->pid); | |
381 | ||
382 | dlm_put_lockspace(ls); | |
383 | return error; | |
384 | } | |
385 | ||
597d0cae DT |
386 | static int device_create_lockspace(struct dlm_lspace_params *params) |
387 | { | |
388 | dlm_lockspace_t *lockspace; | |
389 | struct dlm_ls *ls; | |
254da030 | 390 | int error; |
597d0cae DT |
391 | |
392 | if (!capable(CAP_SYS_ADMIN)) | |
393 | return -EPERM; | |
394 | ||
395 | error = dlm_new_lockspace(params->name, strlen(params->name), | |
3ae1acf9 | 396 | &lockspace, params->flags, DLM_USER_LVB_LEN); |
597d0cae DT |
397 | if (error) |
398 | return error; | |
399 | ||
400 | ls = dlm_find_lockspace_local(lockspace); | |
401 | if (!ls) | |
402 | return -ENOENT; | |
403 | ||
0f8e0d9a | 404 | error = dlm_device_register(ls, params->name); |
597d0cae | 405 | dlm_put_lockspace(ls); |
597d0cae | 406 | |
254da030 PC |
407 | if (error) |
408 | dlm_release_lockspace(lockspace, 0); | |
409 | else | |
410 | error = ls->ls_device.minor; | |
411 | ||
597d0cae DT |
412 | return error; |
413 | } | |
414 | ||
415 | static int device_remove_lockspace(struct dlm_lspace_params *params) | |
416 | { | |
417 | dlm_lockspace_t *lockspace; | |
418 | struct dlm_ls *ls; | |
c6e6f0ba | 419 | int error, force = 0; |
597d0cae DT |
420 | |
421 | if (!capable(CAP_SYS_ADMIN)) | |
422 | return -EPERM; | |
423 | ||
424 | ls = dlm_find_lockspace_device(params->minor); | |
425 | if (!ls) | |
426 | return -ENOENT; | |
427 | ||
c6e6f0ba DT |
428 | if (params->flags & DLM_USER_LSFLG_FORCEFREE) |
429 | force = 2; | |
430 | ||
597d0cae | 431 | lockspace = ls->ls_local_handle; |
0f8e0d9a | 432 | dlm_put_lockspace(ls); |
597d0cae | 433 | |
0f8e0d9a DT |
434 | /* The final dlm_release_lockspace waits for references to go to |
435 | zero, so all processes will need to close their device for the | |
436 | ls before the release will proceed. release also calls the | |
437 | device_deregister above. Converting a positive return value | |
438 | from release to zero means that userspace won't know when its | |
439 | release was the final one, but it shouldn't need to know. */ | |
597d0cae | 440 | |
c6e6f0ba | 441 | error = dlm_release_lockspace(lockspace, force); |
0f8e0d9a DT |
442 | if (error > 0) |
443 | error = 0; | |
597d0cae DT |
444 | return error; |
445 | } | |
446 | ||
447 | /* Check the user's version matches ours */ | |
448 | static int check_version(struct dlm_write_request *req) | |
449 | { | |
450 | if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || | |
451 | (req->version[0] == DLM_DEVICE_VERSION_MAJOR && | |
452 | req->version[1] > DLM_DEVICE_VERSION_MINOR)) { | |
453 | ||
454 | printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " | |
455 | "user (%d.%d.%d) kernel (%d.%d.%d)\n", | |
456 | current->comm, | |
ba25f9dc | 457 | task_pid_nr(current), |
597d0cae DT |
458 | req->version[0], |
459 | req->version[1], | |
460 | req->version[2], | |
461 | DLM_DEVICE_VERSION_MAJOR, | |
462 | DLM_DEVICE_VERSION_MINOR, | |
463 | DLM_DEVICE_VERSION_PATCH); | |
464 | return -EINVAL; | |
465 | } | |
466 | return 0; | |
467 | } | |
468 | ||
469 | /* | |
470 | * device_write | |
471 | * | |
472 | * device_user_lock | |
473 | * dlm_user_request -> request_lock | |
474 | * dlm_user_convert -> convert_lock | |
475 | * | |
476 | * device_user_unlock | |
477 | * dlm_user_unlock -> unlock_lock | |
478 | * dlm_user_cancel -> cancel_lock | |
479 | * | |
480 | * device_create_lockspace | |
481 | * dlm_new_lockspace | |
482 | * | |
483 | * device_remove_lockspace | |
484 | * dlm_release_lockspace | |
485 | */ | |
486 | ||
487 | /* a write to a lockspace device is a lock or unlock request, a write | |
488 | to the control device is to create/remove a lockspace */ | |
489 | ||
490 | static ssize_t device_write(struct file *file, const char __user *buf, | |
491 | size_t count, loff_t *ppos) | |
492 | { | |
493 | struct dlm_user_proc *proc = file->private_data; | |
494 | struct dlm_write_request *kbuf; | |
495 | sigset_t tmpsig, allsigs; | |
496 | int error; | |
497 | ||
498 | #ifdef CONFIG_COMPAT | |
499 | if (count < sizeof(struct dlm_write_request32)) | |
500 | #else | |
501 | if (count < sizeof(struct dlm_write_request)) | |
502 | #endif | |
503 | return -EINVAL; | |
504 | ||
573c24c4 | 505 | kbuf = kzalloc(count + 1, GFP_NOFS); |
597d0cae DT |
506 | if (!kbuf) |
507 | return -ENOMEM; | |
508 | ||
509 | if (copy_from_user(kbuf, buf, count)) { | |
510 | error = -EFAULT; | |
511 | goto out_free; | |
512 | } | |
513 | ||
514 | if (check_version(kbuf)) { | |
515 | error = -EBADE; | |
516 | goto out_free; | |
517 | } | |
518 | ||
519 | #ifdef CONFIG_COMPAT | |
520 | if (!kbuf->is64bit) { | |
521 | struct dlm_write_request32 *k32buf; | |
1fecb1c4 DT |
522 | int namelen = 0; |
523 | ||
524 | if (count > sizeof(struct dlm_write_request32)) | |
525 | namelen = count - sizeof(struct dlm_write_request32); | |
526 | ||
597d0cae | 527 | k32buf = (struct dlm_write_request32 *)kbuf; |
1fecb1c4 DT |
528 | |
529 | /* add 1 after namelen so that the name string is terminated */ | |
530 | kbuf = kzalloc(sizeof(struct dlm_write_request) + namelen + 1, | |
573c24c4 | 531 | GFP_NOFS); |
cb980d9a DT |
532 | if (!kbuf) { |
533 | kfree(k32buf); | |
597d0cae | 534 | return -ENOMEM; |
cb980d9a | 535 | } |
597d0cae DT |
536 | |
537 | if (proc) | |
538 | set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); | |
1fecb1c4 DT |
539 | |
540 | compat_input(kbuf, k32buf, namelen); | |
597d0cae DT |
541 | kfree(k32buf); |
542 | } | |
543 | #endif | |
544 | ||
545 | /* do we really need this? can a write happen after a close? */ | |
546 | if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && | |
cb980d9a DT |
547 | (proc && test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags))) { |
548 | error = -EINVAL; | |
549 | goto out_free; | |
550 | } | |
597d0cae DT |
551 | |
552 | sigfillset(&allsigs); | |
553 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
554 | ||
555 | error = -EINVAL; | |
556 | ||
557 | switch (kbuf->cmd) | |
558 | { | |
559 | case DLM_USER_LOCK: | |
560 | if (!proc) { | |
561 | log_print("no locking on control device"); | |
562 | goto out_sig; | |
563 | } | |
564 | error = device_user_lock(proc, &kbuf->i.lock); | |
565 | break; | |
566 | ||
567 | case DLM_USER_UNLOCK: | |
568 | if (!proc) { | |
569 | log_print("no locking on control device"); | |
570 | goto out_sig; | |
571 | } | |
572 | error = device_user_unlock(proc, &kbuf->i.lock); | |
573 | break; | |
574 | ||
8b4021fa DT |
575 | case DLM_USER_DEADLOCK: |
576 | if (!proc) { | |
577 | log_print("no locking on control device"); | |
578 | goto out_sig; | |
579 | } | |
580 | error = device_user_deadlock(proc, &kbuf->i.lock); | |
581 | break; | |
582 | ||
597d0cae DT |
583 | case DLM_USER_CREATE_LOCKSPACE: |
584 | if (proc) { | |
585 | log_print("create/remove only on control device"); | |
586 | goto out_sig; | |
587 | } | |
588 | error = device_create_lockspace(&kbuf->i.lspace); | |
589 | break; | |
590 | ||
591 | case DLM_USER_REMOVE_LOCKSPACE: | |
592 | if (proc) { | |
593 | log_print("create/remove only on control device"); | |
594 | goto out_sig; | |
595 | } | |
596 | error = device_remove_lockspace(&kbuf->i.lspace); | |
597 | break; | |
598 | ||
72c2be77 DT |
599 | case DLM_USER_PURGE: |
600 | if (!proc) { | |
601 | log_print("no locking on control device"); | |
602 | goto out_sig; | |
603 | } | |
604 | error = device_user_purge(proc, &kbuf->i.purge); | |
605 | break; | |
606 | ||
597d0cae DT |
607 | default: |
608 | log_print("Unknown command passed to DLM device : %d\n", | |
609 | kbuf->cmd); | |
610 | } | |
611 | ||
612 | out_sig: | |
613 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
614 | recalc_sigpending(); | |
615 | out_free: | |
616 | kfree(kbuf); | |
617 | return error; | |
618 | } | |
619 | ||
620 | /* Every process that opens the lockspace device has its own "proc" structure | |
621 | hanging off the open file that's used to keep track of locks owned by the | |
622 | process and asts that need to be delivered to the process. */ | |
623 | ||
624 | static int device_open(struct inode *inode, struct file *file) | |
625 | { | |
626 | struct dlm_user_proc *proc; | |
627 | struct dlm_ls *ls; | |
628 | ||
629 | ls = dlm_find_lockspace_device(iminor(inode)); | |
f9f2ed48 | 630 | if (!ls) |
597d0cae DT |
631 | return -ENOENT; |
632 | ||
573c24c4 | 633 | proc = kzalloc(sizeof(struct dlm_user_proc), GFP_NOFS); |
597d0cae DT |
634 | if (!proc) { |
635 | dlm_put_lockspace(ls); | |
636 | return -ENOMEM; | |
637 | } | |
638 | ||
639 | proc->lockspace = ls->ls_local_handle; | |
640 | INIT_LIST_HEAD(&proc->asts); | |
641 | INIT_LIST_HEAD(&proc->locks); | |
a1bc86e6 | 642 | INIT_LIST_HEAD(&proc->unlocking); |
597d0cae DT |
643 | spin_lock_init(&proc->asts_spin); |
644 | spin_lock_init(&proc->locks_spin); | |
645 | init_waitqueue_head(&proc->wait); | |
646 | file->private_data = proc; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static int device_close(struct inode *inode, struct file *file) | |
652 | { | |
653 | struct dlm_user_proc *proc = file->private_data; | |
654 | struct dlm_ls *ls; | |
655 | sigset_t tmpsig, allsigs; | |
656 | ||
657 | ls = dlm_find_lockspace_local(proc->lockspace); | |
658 | if (!ls) | |
659 | return -ENOENT; | |
660 | ||
661 | sigfillset(&allsigs); | |
662 | sigprocmask(SIG_BLOCK, &allsigs, &tmpsig); | |
663 | ||
664 | set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); | |
665 | ||
666 | dlm_clear_proc_locks(ls, proc); | |
667 | ||
668 | /* at this point no more lkb's should exist for this lockspace, | |
669 | so there's no chance of dlm_user_add_ast() being called and | |
670 | looking for lkb->ua->proc */ | |
671 | ||
672 | kfree(proc); | |
673 | file->private_data = NULL; | |
674 | ||
675 | dlm_put_lockspace(ls); | |
676 | dlm_put_lockspace(ls); /* for the find in device_open() */ | |
677 | ||
678 | /* FIXME: AUTOFREE: if this ls is no longer used do | |
679 | device_remove_lockspace() */ | |
680 | ||
681 | sigprocmask(SIG_SETMASK, &tmpsig, NULL); | |
682 | recalc_sigpending(); | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
8304d6f2 DT |
687 | static int copy_result_to_user(struct dlm_user_args *ua, int compat, |
688 | uint32_t flags, int mode, int copy_lvb, | |
689 | char __user *buf, size_t count) | |
597d0cae DT |
690 | { |
691 | #ifdef CONFIG_COMPAT | |
692 | struct dlm_lock_result32 result32; | |
693 | #endif | |
694 | struct dlm_lock_result result; | |
695 | void *resultptr; | |
696 | int error=0; | |
697 | int len; | |
698 | int struct_len; | |
699 | ||
700 | memset(&result, 0, sizeof(struct dlm_lock_result)); | |
d7db923e DT |
701 | result.version[0] = DLM_DEVICE_VERSION_MAJOR; |
702 | result.version[1] = DLM_DEVICE_VERSION_MINOR; | |
703 | result.version[2] = DLM_DEVICE_VERSION_PATCH; | |
597d0cae DT |
704 | memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); |
705 | result.user_lksb = ua->user_lksb; | |
706 | ||
707 | /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated | |
708 | in a conversion unless the conversion is successful. See code | |
709 | in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, | |
710 | notes that a new blocking AST address and parameter are set even if | |
711 | the conversion fails, so maybe we should just do that. */ | |
712 | ||
8304d6f2 | 713 | if (flags & DLM_CB_BAST) { |
597d0cae DT |
714 | result.user_astaddr = ua->bastaddr; |
715 | result.user_astparam = ua->bastparam; | |
89d799d0 | 716 | result.bast_mode = mode; |
597d0cae DT |
717 | } else { |
718 | result.user_astaddr = ua->castaddr; | |
719 | result.user_astparam = ua->castparam; | |
720 | } | |
721 | ||
722 | #ifdef CONFIG_COMPAT | |
723 | if (compat) | |
724 | len = sizeof(struct dlm_lock_result32); | |
725 | else | |
726 | #endif | |
727 | len = sizeof(struct dlm_lock_result); | |
728 | struct_len = len; | |
729 | ||
730 | /* copy lvb to userspace if there is one, it's been updated, and | |
731 | the user buffer has space for it */ | |
732 | ||
8304d6f2 | 733 | if (copy_lvb && ua->lksb.sb_lvbptr && count >= len + DLM_USER_LVB_LEN) { |
597d0cae DT |
734 | if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, |
735 | DLM_USER_LVB_LEN)) { | |
736 | error = -EFAULT; | |
737 | goto out; | |
738 | } | |
739 | ||
740 | result.lvb_offset = len; | |
741 | len += DLM_USER_LVB_LEN; | |
742 | } | |
743 | ||
744 | result.length = len; | |
745 | resultptr = &result; | |
746 | #ifdef CONFIG_COMPAT | |
747 | if (compat) { | |
748 | compat_output(&result, &result32); | |
749 | resultptr = &result32; | |
750 | } | |
751 | #endif | |
752 | ||
753 | if (copy_to_user(buf, resultptr, struct_len)) | |
754 | error = -EFAULT; | |
755 | else | |
756 | error = len; | |
757 | out: | |
758 | return error; | |
759 | } | |
760 | ||
d7db923e DT |
761 | static int copy_version_to_user(char __user *buf, size_t count) |
762 | { | |
763 | struct dlm_device_version ver; | |
764 | ||
765 | memset(&ver, 0, sizeof(struct dlm_device_version)); | |
766 | ver.version[0] = DLM_DEVICE_VERSION_MAJOR; | |
767 | ver.version[1] = DLM_DEVICE_VERSION_MINOR; | |
768 | ver.version[2] = DLM_DEVICE_VERSION_PATCH; | |
769 | ||
770 | if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) | |
771 | return -EFAULT; | |
772 | return sizeof(struct dlm_device_version); | |
773 | } | |
774 | ||
597d0cae DT |
775 | /* a read returns a single ast described in a struct dlm_lock_result */ |
776 | ||
777 | static ssize_t device_read(struct file *file, char __user *buf, size_t count, | |
778 | loff_t *ppos) | |
779 | { | |
780 | struct dlm_user_proc *proc = file->private_data; | |
781 | struct dlm_lkb *lkb; | |
597d0cae | 782 | DECLARE_WAITQUEUE(wait, current); |
8304d6f2 DT |
783 | struct dlm_callback cb; |
784 | int rv, resid, copy_lvb = 0; | |
597d0cae | 785 | |
d7db923e | 786 | if (count == sizeof(struct dlm_device_version)) { |
8304d6f2 DT |
787 | rv = copy_version_to_user(buf, count); |
788 | return rv; | |
d7db923e DT |
789 | } |
790 | ||
791 | if (!proc) { | |
792 | log_print("non-version read from control device %zu", count); | |
793 | return -EINVAL; | |
794 | } | |
795 | ||
597d0cae DT |
796 | #ifdef CONFIG_COMPAT |
797 | if (count < sizeof(struct dlm_lock_result32)) | |
798 | #else | |
799 | if (count < sizeof(struct dlm_lock_result)) | |
800 | #endif | |
801 | return -EINVAL; | |
802 | ||
89d799d0 DT |
803 | try_another: |
804 | ||
597d0cae DT |
805 | /* do we really need this? can a read happen after a close? */ |
806 | if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) | |
807 | return -EINVAL; | |
808 | ||
809 | spin_lock(&proc->asts_spin); | |
810 | if (list_empty(&proc->asts)) { | |
811 | if (file->f_flags & O_NONBLOCK) { | |
812 | spin_unlock(&proc->asts_spin); | |
813 | return -EAGAIN; | |
814 | } | |
815 | ||
816 | add_wait_queue(&proc->wait, &wait); | |
817 | ||
818 | repeat: | |
819 | set_current_state(TASK_INTERRUPTIBLE); | |
820 | if (list_empty(&proc->asts) && !signal_pending(current)) { | |
821 | spin_unlock(&proc->asts_spin); | |
822 | schedule(); | |
823 | spin_lock(&proc->asts_spin); | |
824 | goto repeat; | |
825 | } | |
826 | set_current_state(TASK_RUNNING); | |
827 | remove_wait_queue(&proc->wait, &wait); | |
828 | ||
829 | if (signal_pending(current)) { | |
830 | spin_unlock(&proc->asts_spin); | |
831 | return -ERESTARTSYS; | |
832 | } | |
833 | } | |
834 | ||
8304d6f2 DT |
835 | /* if we empty lkb_callbacks, we don't want to unlock the spinlock |
836 | without removing lkb_astqueue; so empty lkb_astqueue is always | |
837 | consistent with empty lkb_callbacks */ | |
597d0cae DT |
838 | |
839 | lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); | |
840 | ||
8304d6f2 DT |
841 | rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid); |
842 | if (rv < 0) { | |
843 | /* this shouldn't happen; lkb should have been removed from | |
844 | list when resid was zero */ | |
845 | log_print("dlm_rem_lkb_callback empty %x", lkb->lkb_id); | |
846 | list_del_init(&lkb->lkb_astqueue); | |
847 | spin_unlock(&proc->asts_spin); | |
848 | /* removes ref for proc->asts, may cause lkb to be freed */ | |
849 | dlm_put_lkb(lkb); | |
850 | goto try_another; | |
89d799d0 | 851 | } |
8304d6f2 DT |
852 | if (!resid) |
853 | list_del_init(&lkb->lkb_astqueue); | |
854 | spin_unlock(&proc->asts_spin); | |
89d799d0 | 855 | |
8304d6f2 DT |
856 | if (cb.flags & DLM_CB_SKIP) { |
857 | /* removes ref for proc->asts, may cause lkb to be freed */ | |
858 | if (!resid) | |
859 | dlm_put_lkb(lkb); | |
860 | goto try_another; | |
89d799d0 DT |
861 | } |
862 | ||
8304d6f2 DT |
863 | if (cb.flags & DLM_CB_CAST) { |
864 | int old_mode, new_mode; | |
597d0cae | 865 | |
8304d6f2 DT |
866 | old_mode = lkb->lkb_last_cast.mode; |
867 | new_mode = cb.mode; | |
597d0cae | 868 | |
8304d6f2 DT |
869 | if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr && |
870 | dlm_lvb_operations[old_mode + 1][new_mode + 1]) | |
871 | copy_lvb = 1; | |
89d799d0 | 872 | |
8304d6f2 DT |
873 | lkb->lkb_lksb->sb_status = cb.sb_status; |
874 | lkb->lkb_lksb->sb_flags = cb.sb_flags; | |
89d799d0 | 875 | } |
597d0cae | 876 | |
8304d6f2 DT |
877 | rv = copy_result_to_user(lkb->lkb_ua, |
878 | test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), | |
879 | cb.flags, cb.mode, copy_lvb, buf, count); | |
89d799d0 | 880 | |
8304d6f2 DT |
881 | /* removes ref for proc->asts, may cause lkb to be freed */ |
882 | if (!resid) | |
597d0cae DT |
883 | dlm_put_lkb(lkb); |
884 | ||
8304d6f2 | 885 | return rv; |
597d0cae DT |
886 | } |
887 | ||
888 | static unsigned int device_poll(struct file *file, poll_table *wait) | |
889 | { | |
890 | struct dlm_user_proc *proc = file->private_data; | |
891 | ||
892 | poll_wait(file, &proc->wait, wait); | |
893 | ||
894 | spin_lock(&proc->asts_spin); | |
895 | if (!list_empty(&proc->asts)) { | |
896 | spin_unlock(&proc->asts_spin); | |
897 | return POLLIN | POLLRDNORM; | |
898 | } | |
899 | spin_unlock(&proc->asts_spin); | |
900 | return 0; | |
901 | } | |
902 | ||
dc68c7ed DT |
903 | int dlm_user_daemon_available(void) |
904 | { | |
905 | /* dlm_controld hasn't started (or, has started, but not | |
906 | properly populated configfs) */ | |
907 | ||
908 | if (!dlm_our_nodeid()) | |
909 | return 0; | |
910 | ||
911 | /* This is to deal with versions of dlm_controld that don't | |
912 | know about the monitor device. We assume that if the | |
913 | dlm_controld was started (above), but the monitor device | |
914 | was never opened, that it's an old version. dlm_controld | |
915 | should open the monitor device before populating configfs. */ | |
916 | ||
917 | if (dlm_monitor_unused) | |
918 | return 1; | |
919 | ||
920 | return atomic_read(&dlm_monitor_opened) ? 1 : 0; | |
921 | } | |
922 | ||
597d0cae DT |
923 | static int ctl_device_open(struct inode *inode, struct file *file) |
924 | { | |
925 | file->private_data = NULL; | |
926 | return 0; | |
927 | } | |
928 | ||
929 | static int ctl_device_close(struct inode *inode, struct file *file) | |
930 | { | |
931 | return 0; | |
932 | } | |
933 | ||
dc68c7ed DT |
934 | static int monitor_device_open(struct inode *inode, struct file *file) |
935 | { | |
936 | atomic_inc(&dlm_monitor_opened); | |
937 | dlm_monitor_unused = 0; | |
938 | return 0; | |
939 | } | |
940 | ||
941 | static int monitor_device_close(struct inode *inode, struct file *file) | |
942 | { | |
943 | if (atomic_dec_and_test(&dlm_monitor_opened)) | |
944 | dlm_stop_lockspaces(); | |
945 | return 0; | |
946 | } | |
947 | ||
00977a59 | 948 | static const struct file_operations device_fops = { |
597d0cae DT |
949 | .open = device_open, |
950 | .release = device_close, | |
951 | .read = device_read, | |
952 | .write = device_write, | |
953 | .poll = device_poll, | |
954 | .owner = THIS_MODULE, | |
6038f373 | 955 | .llseek = noop_llseek, |
597d0cae DT |
956 | }; |
957 | ||
00977a59 | 958 | static const struct file_operations ctl_device_fops = { |
597d0cae DT |
959 | .open = ctl_device_open, |
960 | .release = ctl_device_close, | |
d7db923e | 961 | .read = device_read, |
597d0cae DT |
962 | .write = device_write, |
963 | .owner = THIS_MODULE, | |
6038f373 | 964 | .llseek = noop_llseek, |
597d0cae DT |
965 | }; |
966 | ||
0fe410d3 DC |
967 | static struct miscdevice ctl_device = { |
968 | .name = "dlm-control", | |
969 | .fops = &ctl_device_fops, | |
970 | .minor = MISC_DYNAMIC_MINOR, | |
971 | }; | |
972 | ||
dc68c7ed DT |
973 | static const struct file_operations monitor_device_fops = { |
974 | .open = monitor_device_open, | |
975 | .release = monitor_device_close, | |
976 | .owner = THIS_MODULE, | |
6038f373 | 977 | .llseek = noop_llseek, |
dc68c7ed DT |
978 | }; |
979 | ||
980 | static struct miscdevice monitor_device = { | |
981 | .name = "dlm-monitor", | |
982 | .fops = &monitor_device_fops, | |
983 | .minor = MISC_DYNAMIC_MINOR, | |
984 | }; | |
985 | ||
30727174 | 986 | int __init dlm_user_init(void) |
597d0cae DT |
987 | { |
988 | int error; | |
989 | ||
dc68c7ed DT |
990 | atomic_set(&dlm_monitor_opened, 0); |
991 | ||
597d0cae | 992 | error = misc_register(&ctl_device); |
dc68c7ed | 993 | if (error) { |
597d0cae | 994 | log_print("misc_register failed for control device"); |
dc68c7ed DT |
995 | goto out; |
996 | } | |
597d0cae | 997 | |
dc68c7ed DT |
998 | error = misc_register(&monitor_device); |
999 | if (error) { | |
1000 | log_print("misc_register failed for monitor device"); | |
1001 | misc_deregister(&ctl_device); | |
1002 | } | |
1003 | out: | |
597d0cae DT |
1004 | return error; |
1005 | } | |
1006 | ||
1007 | void dlm_user_exit(void) | |
1008 | { | |
1009 | misc_deregister(&ctl_device); | |
dc68c7ed | 1010 | misc_deregister(&monitor_device); |
597d0cae DT |
1011 | } |
1012 |