Blame view
fs/dlm/user.c
24.4 KB
597d0cae0
|
1 |
/* |
7fe2b3190
|
2 |
* Copyright (C) 2006-2010 Red Hat, Inc. All rights reserved. |
597d0cae0
|
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
* * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License v.2. */ #include <linux/miscdevice.h> #include <linux/init.h> #include <linux/wait.h> #include <linux/module.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/poll.h> #include <linux/signal.h> #include <linux/spinlock.h> #include <linux/dlm.h> #include <linux/dlm_device.h> |
5a0e3ad6a
|
20 |
#include <linux/slab.h> |
597d0cae0
|
21 22 23 24 25 |
#include "dlm_internal.h" #include "lockspace.h" #include "lock.h" #include "lvb_table.h" |
84c6e8cd3
|
26 |
#include "user.h" |
8304d6f24
|
27 |
#include "ast.h" |
597d0cae0
|
28 |
|
0fe410d3f
|
29 |
static const char name_prefix[] = "dlm"; |
00977a59b
|
30 |
static const struct file_operations device_fops; |
dc68c7ed3
|
31 32 |
static atomic_t dlm_monitor_opened; static int dlm_monitor_unused = 1; |
597d0cae0
|
33 34 35 36 37 38 |
#ifdef CONFIG_COMPAT struct dlm_lock_params32 { __u8 mode; __u8 namelen; |
d7db923ea
|
39 40 |
__u16 unused; __u32 flags; |
597d0cae0
|
41 42 |
__u32 lkid; __u32 parent; |
d7db923ea
|
43 44 |
__u64 xid; __u64 timeout; |
597d0cae0
|
45 46 47 48 49 |
__u32 castparam; __u32 castaddr; __u32 bastparam; __u32 bastaddr; __u32 lksb; |
597d0cae0
|
50 51 52 53 54 55 56 57 58 59 60 61 62 |
char lvb[DLM_USER_LVB_LEN]; char name[0]; }; struct dlm_write_request32 { __u32 version[3]; __u8 cmd; __u8 is64bit; __u8 unused[2]; union { struct dlm_lock_params32 lock; struct dlm_lspace_params lspace; |
72c2be776
|
63 |
struct dlm_purge_params purge; |
597d0cae0
|
64 65 66 67 68 69 70 71 72 73 74 |
} i; }; struct dlm_lksb32 { __u32 sb_status; __u32 sb_lkid; __u8 sb_flags; __u32 sb_lvbptr; }; struct dlm_lock_result32 { |
d7db923ea
|
75 |
__u32 version[3]; |
597d0cae0
|
76 77 78 79 80 81 82 83 84 85 86 87 |
__u32 length; __u32 user_astaddr; __u32 user_astparam; __u32 user_lksb; struct dlm_lksb32 lksb; __u8 bast_mode; __u8 unused[3]; /* Offsets may be zero if no data is present */ __u32 lvb_offset; }; static void compat_input(struct dlm_write_request *kb, |
2a79289e8
|
88 |
struct dlm_write_request32 *kb32, |
1fecb1c4b
|
89 |
int namelen) |
597d0cae0
|
90 91 92 93 94 95 96 97 98 99 100 |
{ kb->version[0] = kb32->version[0]; kb->version[1] = kb32->version[1]; kb->version[2] = kb32->version[2]; kb->cmd = kb32->cmd; kb->is64bit = kb32->is64bit; if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { kb->i.lspace.flags = kb32->i.lspace.flags; kb->i.lspace.minor = kb32->i.lspace.minor; |
1fecb1c4b
|
101 |
memcpy(kb->i.lspace.name, kb32->i.lspace.name, namelen); |
72c2be776
|
102 103 104 |
} else if (kb->cmd == DLM_USER_PURGE) { kb->i.purge.nodeid = kb32->i.purge.nodeid; kb->i.purge.pid = kb32->i.purge.pid; |
597d0cae0
|
105 106 107 108 109 110 |
} else { kb->i.lock.mode = kb32->i.lock.mode; kb->i.lock.namelen = kb32->i.lock.namelen; kb->i.lock.flags = kb32->i.lock.flags; kb->i.lock.lkid = kb32->i.lock.lkid; kb->i.lock.parent = kb32->i.lock.parent; |
d7db923ea
|
111 112 |
kb->i.lock.xid = kb32->i.lock.xid; kb->i.lock.timeout = kb32->i.lock.timeout; |
597d0cae0
|
113 114 115 116 117 118 |
kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); |
1fecb1c4b
|
119 |
memcpy(kb->i.lock.name, kb32->i.lock.name, namelen); |
597d0cae0
|
120 121 122 123 124 125 |
} } static void compat_output(struct dlm_lock_result *res, struct dlm_lock_result32 *res32) { |
d7db923ea
|
126 127 128 |
res32->version[0] = res->version[0]; res32->version[1] = res->version[1]; res32->version[2] = res->version[2]; |
597d0cae0
|
129 130 131 132 133 134 135 136 137 138 139 140 141 142 |
res32->user_astaddr = (__u32)(long)res->user_astaddr; res32->user_astparam = (__u32)(long)res->user_astparam; res32->user_lksb = (__u32)(long)res->user_lksb; res32->bast_mode = res->bast_mode; res32->lvb_offset = res->lvb_offset; res32->length = res->length; res32->lksb.sb_status = res->lksb.sb_status; res32->lksb.sb_flags = res->lksb.sb_flags; res32->lksb.sb_lkid = res->lksb.sb_lkid; res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; } #endif |
84d8cd69a
|
143 144 145 146 147 148 149 150 151 152 |
/* Figure out if this lock is at the end of its life and no longer available for the application to use. The lkb still exists until the final ast is read. A lock becomes EOL in three situations: 1. a noqueue request fails with EAGAIN 2. an unlock completes with EUNLOCK 3. a cancel of a waiting request completes with ECANCEL/EDEADLK An EOL lock needs to be removed from the process's list of locks. And we can't allow any new operation on an EOL lock. This is not related to the lifetime of the lkb struct which is managed entirely by refcount. */ |
8304d6f24
|
153 |
static int lkb_is_endoflife(int mode, int status) |
84d8cd69a
|
154 |
{ |
8304d6f24
|
155 |
switch (status) { |
84d8cd69a
|
156 157 158 159 |
case -DLM_EUNLOCK: return 1; case -DLM_ECANCEL: case -ETIMEDOUT: |
8b4021fa4
|
160 |
case -EDEADLK: |
84d8cd69a
|
161 |
case -EAGAIN: |
8304d6f24
|
162 |
if (mode == DLM_LOCK_IV) |
84d8cd69a
|
163 164 165 166 167 |
return 1; break; } return 0; } |
ef0c2bb05
|
168 169 |
/* we could possibly check if the cancel of an orphan has resulted in the lkb being removed and then remove that lkb from the orphans list and free it */ |
597d0cae0
|
170 |
|
8304d6f24
|
171 172 |
void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, int status, uint32_t sbflags, uint64_t seq) |
597d0cae0
|
173 174 175 176 |
{ struct dlm_ls *ls; struct dlm_user_args *ua; struct dlm_user_proc *proc; |
8304d6f24
|
177 |
int rv; |
597d0cae0
|
178 |
|
ef0c2bb05
|
179 |
if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) |
597d0cae0
|
180 |
return; |
597d0cae0
|
181 182 183 184 185 186 |
ls = lkb->lkb_resource->res_ls; mutex_lock(&ls->ls_clear_proc_locks); /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed |
ef0c2bb05
|
187 188 189 |
lkb->ua so we can't try to use it. This second check is necessary for cases where a completion ast is received for an operation that began before clear_proc_locks did its cancel/unlock. */ |
597d0cae0
|
190 |
|
ef0c2bb05
|
191 |
if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) |
597d0cae0
|
192 |
goto out; |
597d0cae0
|
193 |
|
d292c0cc4
|
194 195 |
DLM_ASSERT(lkb->lkb_ua, dlm_print_lkb(lkb);); ua = lkb->lkb_ua; |
597d0cae0
|
196 |
proc = ua->proc; |
8304d6f24
|
197 |
if ((flags & DLM_CB_BAST) && ua->bastaddr == NULL) |
597d0cae0
|
198 |
goto out; |
8304d6f24
|
199 200 |
if ((flags & DLM_CB_CAST) && lkb_is_endoflife(mode, status)) lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; |
597d0cae0
|
201 |
spin_lock(&proc->asts_spin); |
ef0c2bb05
|
202 |
|
8304d6f24
|
203 204 205 206 207 |
rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, seq); if (rv < 0) { spin_unlock(&proc->asts_spin); goto out; } |
ef0c2bb05
|
208 |
|
23e8e1aaa
|
209 |
if (list_empty(&lkb->lkb_cb_list)) { |
597d0cae0
|
210 |
kref_get(&lkb->lkb_ref); |
23e8e1aaa
|
211 |
list_add_tail(&lkb->lkb_cb_list, &proc->asts); |
597d0cae0
|
212 213 |
wake_up_interruptible(&proc->wait); } |
597d0cae0
|
214 |
spin_unlock(&proc->asts_spin); |
34e22bed1
|
215 |
|
8304d6f24
|
216 217 |
if (lkb->lkb_flags & DLM_IFL_ENDOFLIFE) { /* N.B. spin_lock locks_spin, not asts_spin */ |
ce5246b97
|
218 |
spin_lock(&proc->locks_spin); |
ef0c2bb05
|
219 220 221 222 |
if (!list_empty(&lkb->lkb_ownqueue)) { list_del_init(&lkb->lkb_ownqueue); dlm_put_lkb(lkb); } |
ce5246b97
|
223 |
spin_unlock(&proc->locks_spin); |
34e22bed1
|
224 |
} |
597d0cae0
|
225 226 227 228 229 230 231 232 233 |
out: mutex_unlock(&ls->ls_clear_proc_locks); } static int device_user_lock(struct dlm_user_proc *proc, struct dlm_lock_params *params) { struct dlm_ls *ls; struct dlm_user_args *ua; |
2ab4bd8ea
|
234 |
uint32_t lkid; |
597d0cae0
|
235 236 237 238 239 240 241 242 243 244 |
int error = -ENOMEM; ls = dlm_find_lockspace_local(proc->lockspace); if (!ls) return -ENOENT; if (!params->castaddr || !params->lksb) { error = -EINVAL; goto out; } |
573c24c4a
|
245 |
ua = kzalloc(sizeof(struct dlm_user_args), GFP_NOFS); |
597d0cae0
|
246 247 248 249 250 251 252 253 |
if (!ua) goto out; ua->proc = proc; ua->user_lksb = params->lksb; ua->castparam = params->castparam; ua->castaddr = params->castaddr; ua->bastparam = params->bastparam; ua->bastaddr = params->bastaddr; |
d7db923ea
|
254 |
ua->xid = params->xid; |
597d0cae0
|
255 |
|
2ab4bd8ea
|
256 |
if (params->flags & DLM_LKF_CONVERT) { |
597d0cae0
|
257 258 |
error = dlm_user_convert(ls, ua, params->mode, params->flags, |
d7db923ea
|
259 260 |
params->lkid, params->lvb, (unsigned long) params->timeout); |
2ab4bd8ea
|
261 262 263 264 265 266 267 268 269 |
} else if (params->flags & DLM_LKF_ORPHAN) { error = dlm_user_adopt_orphan(ls, ua, params->mode, params->flags, params->name, params->namelen, (unsigned long) params->timeout, &lkid); if (!error) error = lkid; } else { |
597d0cae0
|
270 271 272 |
error = dlm_user_request(ls, ua, params->mode, params->flags, params->name, params->namelen, |
d7db923ea
|
273 |
(unsigned long) params->timeout); |
597d0cae0
|
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 |
if (!error) error = ua->lksb.sb_lkid; } out: dlm_put_lockspace(ls); return error; } static int device_user_unlock(struct dlm_user_proc *proc, struct dlm_lock_params *params) { struct dlm_ls *ls; struct dlm_user_args *ua; int error = -ENOMEM; ls = dlm_find_lockspace_local(proc->lockspace); if (!ls) return -ENOENT; |
573c24c4a
|
292 |
ua = kzalloc(sizeof(struct dlm_user_args), GFP_NOFS); |
597d0cae0
|
293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 |
if (!ua) goto out; ua->proc = proc; ua->user_lksb = params->lksb; ua->castparam = params->castparam; ua->castaddr = params->castaddr; if (params->flags & DLM_LKF_CANCEL) error = dlm_user_cancel(ls, ua, params->flags, params->lkid); else error = dlm_user_unlock(ls, ua, params->flags, params->lkid, params->lvb); out: dlm_put_lockspace(ls); return error; } |
8b4021fa4
|
309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 |
static int device_user_deadlock(struct dlm_user_proc *proc, struct dlm_lock_params *params) { struct dlm_ls *ls; int error; ls = dlm_find_lockspace_local(proc->lockspace); if (!ls) return -ENOENT; error = dlm_user_deadlock(ls, params->flags, params->lkid); dlm_put_lockspace(ls); return error; } |
0f8e0d9a3
|
324 |
static int dlm_device_register(struct dlm_ls *ls, char *name) |
254da030d
|
325 326 |
{ int error, len; |
0f8e0d9a3
|
327 328 329 330 |
/* The device is already registered. This happens when the lockspace is created multiple times from userspace. */ if (ls->ls_device.name) return 0; |
254da030d
|
331 332 |
error = -ENOMEM; len = strlen(name) + strlen(name_prefix) + 2; |
573c24c4a
|
333 |
ls->ls_device.name = kzalloc(len, GFP_NOFS); |
254da030d
|
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 |
if (!ls->ls_device.name) goto fail; snprintf((char *)ls->ls_device.name, len, "%s_%s", name_prefix, name); ls->ls_device.fops = &device_fops; ls->ls_device.minor = MISC_DYNAMIC_MINOR; error = misc_register(&ls->ls_device); if (error) { kfree(ls->ls_device.name); } fail: return error; } |
0f8e0d9a3
|
349 350 |
int dlm_device_deregister(struct dlm_ls *ls) { |
0f8e0d9a3
|
351 352 353 354 355 |
/* The device is not registered. This happens when the lockspace was never used from userspace, or when device_create_lockspace() calls dlm_release_lockspace() after the register fails. */ if (!ls->ls_device.name) return 0; |
f368ed608
|
356 357 358 |
misc_deregister(&ls->ls_device); kfree(ls->ls_device.name); return 0; |
0f8e0d9a3
|
359 |
} |
72c2be776
|
360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 |
static int device_user_purge(struct dlm_user_proc *proc, struct dlm_purge_params *params) { struct dlm_ls *ls; int error; ls = dlm_find_lockspace_local(proc->lockspace); if (!ls) return -ENOENT; error = dlm_user_purge(ls, proc, params->nodeid, params->pid); dlm_put_lockspace(ls); return error; } |
597d0cae0
|
375 376 377 378 |
static int device_create_lockspace(struct dlm_lspace_params *params) { dlm_lockspace_t *lockspace; struct dlm_ls *ls; |
254da030d
|
379 |
int error; |
597d0cae0
|
380 381 382 |
if (!capable(CAP_SYS_ADMIN)) return -EPERM; |
60f98d183
|
383 384 385 |
error = dlm_new_lockspace(params->name, NULL, params->flags, DLM_USER_LVB_LEN, NULL, NULL, NULL, &lockspace); |
597d0cae0
|
386 387 388 389 390 391 |
if (error) return error; ls = dlm_find_lockspace_local(lockspace); if (!ls) return -ENOENT; |
0f8e0d9a3
|
392 |
error = dlm_device_register(ls, params->name); |
597d0cae0
|
393 |
dlm_put_lockspace(ls); |
597d0cae0
|
394 |
|
254da030d
|
395 396 397 398 |
if (error) dlm_release_lockspace(lockspace, 0); else error = ls->ls_device.minor; |
597d0cae0
|
399 400 401 402 403 404 405 |
return error; } static int device_remove_lockspace(struct dlm_lspace_params *params) { dlm_lockspace_t *lockspace; struct dlm_ls *ls; |
c6e6f0ba8
|
406 |
int error, force = 0; |
597d0cae0
|
407 408 409 410 411 412 413 |
if (!capable(CAP_SYS_ADMIN)) return -EPERM; ls = dlm_find_lockspace_device(params->minor); if (!ls) return -ENOENT; |
c6e6f0ba8
|
414 415 |
if (params->flags & DLM_USER_LSFLG_FORCEFREE) force = 2; |
597d0cae0
|
416 |
lockspace = ls->ls_local_handle; |
0f8e0d9a3
|
417 |
dlm_put_lockspace(ls); |
597d0cae0
|
418 |
|
0f8e0d9a3
|
419 420 421 422 423 424 |
/* The final dlm_release_lockspace waits for references to go to zero, so all processes will need to close their device for the ls before the release will proceed. release also calls the device_deregister above. Converting a positive return value from release to zero means that userspace won't know when its release was the final one, but it shouldn't need to know. */ |
597d0cae0
|
425 |
|
c6e6f0ba8
|
426 |
error = dlm_release_lockspace(lockspace, force); |
0f8e0d9a3
|
427 428 |
if (error > 0) error = 0; |
597d0cae0
|
429 430 431 432 433 434 435 436 437 438 439 440 441 442 |
return error; } /* Check the user's version matches ours */ static int check_version(struct dlm_write_request *req) { if (req->version[0] != DLM_DEVICE_VERSION_MAJOR || (req->version[0] == DLM_DEVICE_VERSION_MAJOR && req->version[1] > DLM_DEVICE_VERSION_MINOR)) { printk(KERN_DEBUG "dlm: process %s (%d) version mismatch " "user (%d.%d.%d) kernel (%d.%d.%d) ", current->comm, |
ba25f9dcc
|
443 |
task_pid_nr(current), |
597d0cae0
|
444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 |
req->version[0], req->version[1], req->version[2], DLM_DEVICE_VERSION_MAJOR, DLM_DEVICE_VERSION_MINOR, DLM_DEVICE_VERSION_PATCH); return -EINVAL; } return 0; } /* * device_write * * device_user_lock * dlm_user_request -> request_lock * dlm_user_convert -> convert_lock * * device_user_unlock * dlm_user_unlock -> unlock_lock * dlm_user_cancel -> cancel_lock * * device_create_lockspace * dlm_new_lockspace * * device_remove_lockspace * dlm_release_lockspace */ /* a write to a lockspace device is a lock or unlock request, a write to the control device is to create/remove a lockspace */ static ssize_t device_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct dlm_user_proc *proc = file->private_data; struct dlm_write_request *kbuf; |
597d0cae0
|
481 482 483 484 485 486 487 488 |
int error; #ifdef CONFIG_COMPAT if (count < sizeof(struct dlm_write_request32)) #else if (count < sizeof(struct dlm_write_request)) #endif return -EINVAL; |
d4b0bcf32
|
489 490 491 492 |
/* * can't compare against COMPAT/dlm_write_request32 because * we don't yet know if is64bit is zero */ |
2b75bc912
|
493 |
if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN) |
2b75bc912
|
494 |
return -EINVAL; |
16e5c1fc3
|
495 |
kbuf = memdup_user_nul(buf, count); |
117aa41e8
|
496 |
if (IS_ERR(kbuf)) |
16e5c1fc3
|
497 |
return PTR_ERR(kbuf); |
597d0cae0
|
498 499 500 501 502 503 504 505 506 |
if (check_version(kbuf)) { error = -EBADE; goto out_free; } #ifdef CONFIG_COMPAT if (!kbuf->is64bit) { struct dlm_write_request32 *k32buf; |
1fecb1c4b
|
507 508 509 510 |
int namelen = 0; if (count > sizeof(struct dlm_write_request32)) namelen = count - sizeof(struct dlm_write_request32); |
597d0cae0
|
511 |
k32buf = (struct dlm_write_request32 *)kbuf; |
1fecb1c4b
|
512 513 514 |
/* add 1 after namelen so that the name string is terminated */ kbuf = kzalloc(sizeof(struct dlm_write_request) + namelen + 1, |
573c24c4a
|
515 |
GFP_NOFS); |
cb980d9a3
|
516 517 |
if (!kbuf) { kfree(k32buf); |
597d0cae0
|
518 |
return -ENOMEM; |
cb980d9a3
|
519 |
} |
597d0cae0
|
520 521 522 |
if (proc) set_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags); |
1fecb1c4b
|
523 524 |
compat_input(kbuf, k32buf, namelen); |
597d0cae0
|
525 526 527 528 529 530 |
kfree(k32buf); } #endif /* do we really need this? can a write happen after a close? */ if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && |
cb980d9a3
|
531 532 533 534 |
(proc && test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags))) { error = -EINVAL; goto out_free; } |
597d0cae0
|
535 |
|
597d0cae0
|
536 537 538 539 540 541 542 |
error = -EINVAL; switch (kbuf->cmd) { case DLM_USER_LOCK: if (!proc) { log_print("no locking on control device"); |
c6ca7bc91
|
543 |
goto out_free; |
597d0cae0
|
544 545 546 547 548 549 550 |
} error = device_user_lock(proc, &kbuf->i.lock); break; case DLM_USER_UNLOCK: if (!proc) { log_print("no locking on control device"); |
c6ca7bc91
|
551 |
goto out_free; |
597d0cae0
|
552 553 554 |
} error = device_user_unlock(proc, &kbuf->i.lock); break; |
8b4021fa4
|
555 556 557 |
case DLM_USER_DEADLOCK: if (!proc) { log_print("no locking on control device"); |
c6ca7bc91
|
558 |
goto out_free; |
8b4021fa4
|
559 560 561 |
} error = device_user_deadlock(proc, &kbuf->i.lock); break; |
597d0cae0
|
562 563 564 |
case DLM_USER_CREATE_LOCKSPACE: if (proc) { log_print("create/remove only on control device"); |
c6ca7bc91
|
565 |
goto out_free; |
597d0cae0
|
566 567 568 569 570 571 572 |
} error = device_create_lockspace(&kbuf->i.lspace); break; case DLM_USER_REMOVE_LOCKSPACE: if (proc) { log_print("create/remove only on control device"); |
c6ca7bc91
|
573 |
goto out_free; |
597d0cae0
|
574 575 576 |
} error = device_remove_lockspace(&kbuf->i.lspace); break; |
72c2be776
|
577 578 579 |
case DLM_USER_PURGE: if (!proc) { log_print("no locking on control device"); |
c6ca7bc91
|
580 |
goto out_free; |
72c2be776
|
581 582 583 |
} error = device_user_purge(proc, &kbuf->i.purge); break; |
597d0cae0
|
584 585 586 587 588 |
default: log_print("Unknown command passed to DLM device : %d ", kbuf->cmd); } |
597d0cae0
|
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 |
out_free: kfree(kbuf); return error; } /* Every process that opens the lockspace device has its own "proc" structure hanging off the open file that's used to keep track of locks owned by the process and asts that need to be delivered to the process. */ static int device_open(struct inode *inode, struct file *file) { struct dlm_user_proc *proc; struct dlm_ls *ls; ls = dlm_find_lockspace_device(iminor(inode)); |
f9f2ed486
|
604 |
if (!ls) |
597d0cae0
|
605 |
return -ENOENT; |
573c24c4a
|
606 |
proc = kzalloc(sizeof(struct dlm_user_proc), GFP_NOFS); |
597d0cae0
|
607 608 609 610 611 612 613 614 |
if (!proc) { dlm_put_lockspace(ls); return -ENOMEM; } proc->lockspace = ls->ls_local_handle; INIT_LIST_HEAD(&proc->asts); INIT_LIST_HEAD(&proc->locks); |
a1bc86e6b
|
615 |
INIT_LIST_HEAD(&proc->unlocking); |
597d0cae0
|
616 617 618 619 620 621 622 623 624 625 626 627 |
spin_lock_init(&proc->asts_spin); spin_lock_init(&proc->locks_spin); init_waitqueue_head(&proc->wait); file->private_data = proc; return 0; } static int device_close(struct inode *inode, struct file *file) { struct dlm_user_proc *proc = file->private_data; struct dlm_ls *ls; |
597d0cae0
|
628 629 630 631 |
ls = dlm_find_lockspace_local(proc->lockspace); if (!ls) return -ENOENT; |
597d0cae0
|
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 |
set_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags); dlm_clear_proc_locks(ls, proc); /* at this point no more lkb's should exist for this lockspace, so there's no chance of dlm_user_add_ast() being called and looking for lkb->ua->proc */ kfree(proc); file->private_data = NULL; dlm_put_lockspace(ls); dlm_put_lockspace(ls); /* for the find in device_open() */ /* FIXME: AUTOFREE: if this ls is no longer used do device_remove_lockspace() */ |
597d0cae0
|
648 649 |
return 0; } |
8304d6f24
|
650 651 652 |
static int copy_result_to_user(struct dlm_user_args *ua, int compat, uint32_t flags, int mode, int copy_lvb, char __user *buf, size_t count) |
597d0cae0
|
653 654 655 656 657 658 659 660 661 662 663 |
{ #ifdef CONFIG_COMPAT struct dlm_lock_result32 result32; #endif struct dlm_lock_result result; void *resultptr; int error=0; int len; int struct_len; memset(&result, 0, sizeof(struct dlm_lock_result)); |
d7db923ea
|
664 665 666 |
result.version[0] = DLM_DEVICE_VERSION_MAJOR; result.version[1] = DLM_DEVICE_VERSION_MINOR; result.version[2] = DLM_DEVICE_VERSION_PATCH; |
597d0cae0
|
667 668 669 670 671 672 673 674 |
memcpy(&result.lksb, &ua->lksb, sizeof(struct dlm_lksb)); result.user_lksb = ua->user_lksb; /* FIXME: dlm1 provides for the user's bastparam/addr to not be updated in a conversion unless the conversion is successful. See code in dlm_user_convert() for updating ua from ua_tmp. OpenVMS, though, notes that a new blocking AST address and parameter are set even if the conversion fails, so maybe we should just do that. */ |
8304d6f24
|
675 |
if (flags & DLM_CB_BAST) { |
597d0cae0
|
676 677 |
result.user_astaddr = ua->bastaddr; result.user_astparam = ua->bastparam; |
89d799d00
|
678 |
result.bast_mode = mode; |
597d0cae0
|
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 |
} else { result.user_astaddr = ua->castaddr; result.user_astparam = ua->castparam; } #ifdef CONFIG_COMPAT if (compat) len = sizeof(struct dlm_lock_result32); else #endif len = sizeof(struct dlm_lock_result); struct_len = len; /* copy lvb to userspace if there is one, it's been updated, and the user buffer has space for it */ |
8304d6f24
|
694 |
if (copy_lvb && ua->lksb.sb_lvbptr && count >= len + DLM_USER_LVB_LEN) { |
597d0cae0
|
695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 |
if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, DLM_USER_LVB_LEN)) { error = -EFAULT; goto out; } result.lvb_offset = len; len += DLM_USER_LVB_LEN; } result.length = len; resultptr = &result; #ifdef CONFIG_COMPAT if (compat) { compat_output(&result, &result32); resultptr = &result32; } #endif if (copy_to_user(buf, resultptr, struct_len)) error = -EFAULT; else error = len; out: return error; } |
d7db923ea
|
721 722 723 724 725 726 727 728 729 730 731 732 733 |
static int copy_version_to_user(char __user *buf, size_t count) { struct dlm_device_version ver; memset(&ver, 0, sizeof(struct dlm_device_version)); ver.version[0] = DLM_DEVICE_VERSION_MAJOR; ver.version[1] = DLM_DEVICE_VERSION_MINOR; ver.version[2] = DLM_DEVICE_VERSION_PATCH; if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) return -EFAULT; return sizeof(struct dlm_device_version); } |
597d0cae0
|
734 735 736 737 738 739 740 |
/* a read returns a single ast described in a struct dlm_lock_result */ static ssize_t device_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct dlm_user_proc *proc = file->private_data; struct dlm_lkb *lkb; |
597d0cae0
|
741 |
DECLARE_WAITQUEUE(wait, current); |
8304d6f24
|
742 743 |
struct dlm_callback cb; int rv, resid, copy_lvb = 0; |
b96f46503
|
744 |
int old_mode, new_mode; |
597d0cae0
|
745 |
|
d7db923ea
|
746 |
if (count == sizeof(struct dlm_device_version)) { |
8304d6f24
|
747 748 |
rv = copy_version_to_user(buf, count); return rv; |
d7db923ea
|
749 750 751 752 753 754 |
} if (!proc) { log_print("non-version read from control device %zu", count); return -EINVAL; } |
597d0cae0
|
755 756 757 758 759 760 |
#ifdef CONFIG_COMPAT if (count < sizeof(struct dlm_lock_result32)) #else if (count < sizeof(struct dlm_lock_result)) #endif return -EINVAL; |
89d799d00
|
761 |
try_another: |
597d0cae0
|
762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 |
/* do we really need this? can a read happen after a close? */ if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) return -EINVAL; spin_lock(&proc->asts_spin); if (list_empty(&proc->asts)) { if (file->f_flags & O_NONBLOCK) { spin_unlock(&proc->asts_spin); return -EAGAIN; } add_wait_queue(&proc->wait, &wait); repeat: set_current_state(TASK_INTERRUPTIBLE); if (list_empty(&proc->asts) && !signal_pending(current)) { spin_unlock(&proc->asts_spin); schedule(); spin_lock(&proc->asts_spin); goto repeat; } set_current_state(TASK_RUNNING); remove_wait_queue(&proc->wait, &wait); if (signal_pending(current)) { spin_unlock(&proc->asts_spin); return -ERESTARTSYS; } } |
8304d6f24
|
791 |
/* if we empty lkb_callbacks, we don't want to unlock the spinlock |
23e8e1aaa
|
792 |
without removing lkb_cb_list; so empty lkb_cb_list is always |
8304d6f24
|
793 |
consistent with empty lkb_callbacks */ |
597d0cae0
|
794 |
|
23e8e1aaa
|
795 |
lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_cb_list); |
597d0cae0
|
796 |
|
b96f46503
|
797 798 |
/* rem_lkb_callback sets a new lkb_last_cast */ old_mode = lkb->lkb_last_cast.mode; |
8304d6f24
|
799 800 801 802 803 |
rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid); if (rv < 0) { /* this shouldn't happen; lkb should have been removed from list when resid was zero */ log_print("dlm_rem_lkb_callback empty %x", lkb->lkb_id); |
23e8e1aaa
|
804 |
list_del_init(&lkb->lkb_cb_list); |
8304d6f24
|
805 806 807 808 |
spin_unlock(&proc->asts_spin); /* removes ref for proc->asts, may cause lkb to be freed */ dlm_put_lkb(lkb); goto try_another; |
89d799d00
|
809 |
} |
8304d6f24
|
810 |
if (!resid) |
23e8e1aaa
|
811 |
list_del_init(&lkb->lkb_cb_list); |
8304d6f24
|
812 |
spin_unlock(&proc->asts_spin); |
89d799d00
|
813 |
|
8304d6f24
|
814 815 816 817 818 |
if (cb.flags & DLM_CB_SKIP) { /* removes ref for proc->asts, may cause lkb to be freed */ if (!resid) dlm_put_lkb(lkb); goto try_another; |
89d799d00
|
819 |
} |
8304d6f24
|
820 |
if (cb.flags & DLM_CB_CAST) { |
8304d6f24
|
821 |
new_mode = cb.mode; |
597d0cae0
|
822 |
|
8304d6f24
|
823 824 825 |
if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr && dlm_lvb_operations[old_mode + 1][new_mode + 1]) copy_lvb = 1; |
89d799d00
|
826 |
|
8304d6f24
|
827 828 |
lkb->lkb_lksb->sb_status = cb.sb_status; lkb->lkb_lksb->sb_flags = cb.sb_flags; |
89d799d00
|
829 |
} |
597d0cae0
|
830 |
|
8304d6f24
|
831 832 833 |
rv = copy_result_to_user(lkb->lkb_ua, test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), cb.flags, cb.mode, copy_lvb, buf, count); |
89d799d00
|
834 |
|
8304d6f24
|
835 836 |
/* removes ref for proc->asts, may cause lkb to be freed */ if (!resid) |
597d0cae0
|
837 |
dlm_put_lkb(lkb); |
8304d6f24
|
838 |
return rv; |
597d0cae0
|
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 |
} static unsigned int device_poll(struct file *file, poll_table *wait) { struct dlm_user_proc *proc = file->private_data; poll_wait(file, &proc->wait, wait); spin_lock(&proc->asts_spin); if (!list_empty(&proc->asts)) { spin_unlock(&proc->asts_spin); return POLLIN | POLLRDNORM; } spin_unlock(&proc->asts_spin); return 0; } |
dc68c7ed3
|
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 |
int dlm_user_daemon_available(void) { /* dlm_controld hasn't started (or, has started, but not properly populated configfs) */ if (!dlm_our_nodeid()) return 0; /* This is to deal with versions of dlm_controld that don't know about the monitor device. We assume that if the dlm_controld was started (above), but the monitor device was never opened, that it's an old version. dlm_controld should open the monitor device before populating configfs. */ if (dlm_monitor_unused) return 1; return atomic_read(&dlm_monitor_opened) ? 1 : 0; } |
597d0cae0
|
874 875 876 877 878 879 880 881 882 883 |
static int ctl_device_open(struct inode *inode, struct file *file) { file->private_data = NULL; return 0; } static int ctl_device_close(struct inode *inode, struct file *file) { return 0; } |
dc68c7ed3
|
884 885 886 887 888 889 890 891 892 893 894 895 896 |
static int monitor_device_open(struct inode *inode, struct file *file) { atomic_inc(&dlm_monitor_opened); dlm_monitor_unused = 0; return 0; } static int monitor_device_close(struct inode *inode, struct file *file) { if (atomic_dec_and_test(&dlm_monitor_opened)) dlm_stop_lockspaces(); return 0; } |
00977a59b
|
897 |
static const struct file_operations device_fops = { |
597d0cae0
|
898 899 900 901 902 903 |
.open = device_open, .release = device_close, .read = device_read, .write = device_write, .poll = device_poll, .owner = THIS_MODULE, |
6038f373a
|
904 |
.llseek = noop_llseek, |
597d0cae0
|
905 |
}; |
00977a59b
|
906 |
static const struct file_operations ctl_device_fops = { |
597d0cae0
|
907 908 |
.open = ctl_device_open, .release = ctl_device_close, |
d7db923ea
|
909 |
.read = device_read, |
597d0cae0
|
910 911 |
.write = device_write, .owner = THIS_MODULE, |
6038f373a
|
912 |
.llseek = noop_llseek, |
597d0cae0
|
913 |
}; |
0fe410d3f
|
914 915 916 917 918 |
static struct miscdevice ctl_device = { .name = "dlm-control", .fops = &ctl_device_fops, .minor = MISC_DYNAMIC_MINOR, }; |
dc68c7ed3
|
919 920 921 922 |
static const struct file_operations monitor_device_fops = { .open = monitor_device_open, .release = monitor_device_close, .owner = THIS_MODULE, |
6038f373a
|
923 |
.llseek = noop_llseek, |
dc68c7ed3
|
924 925 926 927 928 929 930 |
}; static struct miscdevice monitor_device = { .name = "dlm-monitor", .fops = &monitor_device_fops, .minor = MISC_DYNAMIC_MINOR, }; |
30727174b
|
931 |
int __init dlm_user_init(void) |
597d0cae0
|
932 933 |
{ int error; |
dc68c7ed3
|
934 |
atomic_set(&dlm_monitor_opened, 0); |
597d0cae0
|
935 |
error = misc_register(&ctl_device); |
dc68c7ed3
|
936 |
if (error) { |
597d0cae0
|
937 |
log_print("misc_register failed for control device"); |
dc68c7ed3
|
938 939 |
goto out; } |
597d0cae0
|
940 |
|
dc68c7ed3
|
941 942 943 944 945 946 |
error = misc_register(&monitor_device); if (error) { log_print("misc_register failed for monitor device"); misc_deregister(&ctl_device); } out: |
597d0cae0
|
947 948 949 950 951 952 |
return error; } void dlm_user_exit(void) { misc_deregister(&ctl_device); |
dc68c7ed3
|
953 |
misc_deregister(&monitor_device); |
597d0cae0
|
954 |
} |