1 | /* $NetBSD: puffs_msgif.c,v 1.99 2016/07/07 06:55:42 msaitoh Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2005, 2006, 2007 Antti Kantee. All Rights Reserved. |
5 | * |
6 | * Development of this software was supported by the |
7 | * Google Summer of Code program and the Ulla Tuominen Foundation. |
8 | * The Google SoC project was mentored by Bill Studenmund. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
20 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
21 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
22 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
25 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | */ |
31 | |
32 | #include <sys/cdefs.h> |
33 | __KERNEL_RCSID(0, "$NetBSD: puffs_msgif.c,v 1.99 2016/07/07 06:55:42 msaitoh Exp $" ); |
34 | |
35 | #include <sys/param.h> |
36 | #include <sys/kernel.h> |
37 | #include <sys/atomic.h> |
38 | #include <sys/kmem.h> |
39 | #include <sys/kthread.h> |
40 | #include <sys/lock.h> |
41 | #include <sys/mount.h> |
42 | #include <sys/namei.h> |
43 | #include <sys/proc.h> |
44 | #include <sys/vnode.h> |
45 | #include <sys/atomic.h> |
46 | |
47 | #include <uvm/uvm.h> |
48 | |
49 | #include <dev/putter/putter_sys.h> |
50 | |
51 | #include <fs/puffs/puffs_msgif.h> |
52 | #include <fs/puffs/puffs_sys.h> |
53 | |
54 | /* |
55 | * waitq data structures |
56 | */ |
57 | |
58 | /* |
59 | * While a request is going to userspace, park the caller within the |
60 | * kernel. This is the kernel counterpart of "struct puffs_req". |
61 | */ |
62 | struct puffs_msgpark { |
63 | struct puffs_req *park_preq; /* req followed by buf */ |
64 | |
65 | size_t park_copylen; /* userspace copylength */ |
66 | size_t park_maxlen; /* max size in comeback */ |
67 | |
68 | struct puffs_req *park_creq; /* non-compat preq */ |
69 | size_t park_creqlen; /* non-compat preq len */ |
70 | |
71 | parkdone_fn park_done; /* "biodone" a'la puffs */ |
72 | void *park_donearg; |
73 | |
74 | int park_flags; |
75 | int park_refcount; |
76 | |
77 | kcondvar_t park_cv; |
78 | kmutex_t park_mtx; |
79 | |
80 | TAILQ_ENTRY(puffs_msgpark) park_entries; |
81 | }; |
82 | #define PARKFLAG_WAITERGONE 0x01 |
83 | #define PARKFLAG_DONE 0x02 |
84 | #define PARKFLAG_ONQUEUE1 0x04 |
85 | #define PARKFLAG_ONQUEUE2 0x08 |
86 | #define PARKFLAG_CALL 0x10 |
87 | #define PARKFLAG_WANTREPLY 0x20 |
88 | #define PARKFLAG_HASERROR 0x40 |
89 | |
90 | static pool_cache_t parkpc; |
91 | #ifdef PUFFSDEBUG |
92 | static int totalpark; |
93 | #endif |
94 | |
95 | int puffs_sopreq_expire_timeout = PUFFS_SOPREQ_EXPIRE_TIMEOUT; |
96 | |
97 | static int |
98 | makepark(void *arg, void *obj, int flags) |
99 | { |
100 | struct puffs_msgpark *park = obj; |
101 | |
102 | mutex_init(&park->park_mtx, MUTEX_DEFAULT, IPL_NONE); |
103 | cv_init(&park->park_cv, "puffsrpl" ); |
104 | |
105 | return 0; |
106 | } |
107 | |
108 | static void |
109 | nukepark(void *arg, void *obj) |
110 | { |
111 | struct puffs_msgpark *park = obj; |
112 | |
113 | cv_destroy(&park->park_cv); |
114 | mutex_destroy(&park->park_mtx); |
115 | } |
116 | |
117 | void |
118 | puffs_msgif_init(void) |
119 | { |
120 | |
121 | parkpc = pool_cache_init(sizeof(struct puffs_msgpark), 0, 0, 0, |
122 | "puffprkl" , NULL, IPL_NONE, makepark, nukepark, NULL); |
123 | } |
124 | |
125 | void |
126 | puffs_msgif_destroy(void) |
127 | { |
128 | |
129 | pool_cache_destroy(parkpc); |
130 | } |
131 | |
132 | static struct puffs_msgpark * |
133 | puffs_msgpark_alloc(int waitok) |
134 | { |
135 | struct puffs_msgpark *park; |
136 | |
137 | KASSERT(curlwp != uvm.pagedaemon_lwp || !waitok); |
138 | |
139 | park = pool_cache_get(parkpc, waitok ? PR_WAITOK : PR_NOWAIT); |
140 | if (park == NULL) |
141 | return park; |
142 | |
143 | park->park_refcount = 1; |
144 | park->park_preq = park->park_creq = NULL; |
145 | park->park_flags = PARKFLAG_WANTREPLY; |
146 | |
147 | #ifdef PUFFSDEBUG |
148 | totalpark++; |
149 | #endif |
150 | |
151 | return park; |
152 | } |
153 | |
154 | static void |
155 | puffs_msgpark_reference(struct puffs_msgpark *park) |
156 | { |
157 | |
158 | KASSERT(mutex_owned(&park->park_mtx)); |
159 | park->park_refcount++; |
160 | } |
161 | |
162 | /* |
163 | * Release reference to park structure. |
164 | */ |
165 | static void |
166 | puffs_msgpark_release1(struct puffs_msgpark *park, int howmany) |
167 | { |
168 | struct puffs_req *preq = park->park_preq; |
169 | struct puffs_req *creq = park->park_creq; |
170 | int refcnt; |
171 | |
172 | KASSERT(mutex_owned(&park->park_mtx)); |
173 | refcnt = park->park_refcount -= howmany; |
174 | mutex_exit(&park->park_mtx); |
175 | |
176 | KASSERT(refcnt >= 0); |
177 | |
178 | if (refcnt == 0) { |
179 | if (preq) |
180 | kmem_free(preq, park->park_maxlen); |
181 | #if 1 |
182 | if (creq) |
183 | kmem_free(creq, park->park_creqlen); |
184 | #endif |
185 | pool_cache_put(parkpc, park); |
186 | |
187 | #ifdef PUFFSDEBUG |
188 | totalpark--; |
189 | #endif |
190 | } |
191 | } |
192 | #define puffs_msgpark_release(a) puffs_msgpark_release1(a, 1) |
193 | |
194 | #ifdef PUFFSDEBUG |
195 | static void |
196 | parkdump(struct puffs_msgpark *park) |
197 | { |
198 | |
199 | DPRINTF(("park %p, preq %p, id %" PRIu64 "\n" |
200 | "\tcopy %zu, max %zu - done: %p/%p\n" |
201 | "\tflags 0x%08x, refcount %d, cv/mtx: %p/%p\n" , |
202 | park, park->park_preq, park->park_preq->preq_id, |
203 | park->park_copylen, park->park_maxlen, |
204 | park->park_done, park->park_donearg, |
205 | park->park_flags, park->park_refcount, |
206 | &park->park_cv, &park->park_mtx)); |
207 | } |
208 | |
209 | static void |
210 | parkqdump(struct puffs_wq *q, int dumpall) |
211 | { |
212 | struct puffs_msgpark *park; |
213 | int total = 0; |
214 | |
215 | TAILQ_FOREACH(park, q, park_entries) { |
216 | if (dumpall) |
217 | parkdump(park); |
218 | total++; |
219 | } |
220 | DPRINTF(("puffs waitqueue at %p dumped, %d total\n" , q, total)); |
221 | |
222 | } |
223 | #endif /* PUFFSDEBUG */ |
224 | |
225 | /* |
226 | * A word about locking in the park structures: the lock protects the |
227 | * fields of the *park* structure (not preq) and acts as an interlock |
228 | * in cv operations. The lock is always internal to this module and |
229 | * callers do not need to worry about it. |
230 | */ |
231 | |
232 | int |
233 | puffs_msgmem_alloc(size_t len, struct puffs_msgpark **ppark, void **mem, |
234 | int cansleep) |
235 | { |
236 | struct puffs_msgpark *park; |
237 | void *m; |
238 | |
239 | KASSERT(curlwp != uvm.pagedaemon_lwp || !cansleep); |
240 | m = kmem_zalloc(len, cansleep ? KM_SLEEP : KM_NOSLEEP); |
241 | if (m == NULL) { |
242 | KASSERT(cansleep == 0); |
243 | return ENOMEM; |
244 | } |
245 | |
246 | park = puffs_msgpark_alloc(cansleep); |
247 | if (park == NULL) { |
248 | KASSERT(cansleep == 0); |
249 | kmem_free(m, len); |
250 | return ENOMEM; |
251 | } |
252 | |
253 | park->park_preq = m; |
254 | park->park_maxlen = park->park_copylen = len; |
255 | |
256 | *ppark = park; |
257 | *mem = m; |
258 | |
259 | return 0; |
260 | } |
261 | |
262 | void |
263 | puffs_msgmem_release(struct puffs_msgpark *park) |
264 | { |
265 | |
266 | if (park == NULL) |
267 | return; |
268 | |
269 | mutex_enter(&park->park_mtx); |
270 | puffs_msgpark_release(park); |
271 | } |
272 | |
273 | void |
274 | puffs_msg_setfaf(struct puffs_msgpark *park) |
275 | { |
276 | |
277 | KASSERT((park->park_flags & PARKFLAG_CALL) == 0); |
278 | park->park_flags &= ~PARKFLAG_WANTREPLY; |
279 | } |
280 | |
281 | void |
282 | puffs_msg_setdelta(struct puffs_msgpark *park, size_t delta) |
283 | { |
284 | |
285 | KASSERT(delta < park->park_maxlen); /* "<=" wouldn't make sense */ |
286 | park->park_copylen = park->park_maxlen - delta; |
287 | } |
288 | |
289 | void |
290 | puffs_msg_setinfo(struct puffs_msgpark *park, int opclass, int type, |
291 | puffs_cookie_t ck) |
292 | { |
293 | |
294 | park->park_preq->preq_opclass = PUFFSOP_OPCLASS(opclass); |
295 | park->park_preq->preq_optype = type; |
296 | park->park_preq->preq_cookie = ck; |
297 | } |
298 | |
299 | void |
300 | puffs_msg_setcall(struct puffs_msgpark *park, parkdone_fn donefn, void *donearg) |
301 | { |
302 | |
303 | KASSERT(park->park_flags & PARKFLAG_WANTREPLY); |
304 | park->park_done = donefn; |
305 | park->park_donearg = donearg; |
306 | park->park_flags |= PARKFLAG_CALL; |
307 | } |
308 | |
309 | /* |
310 | * kernel-user-kernel waitqueues |
311 | */ |
312 | |
313 | static uint64_t |
314 | puffs_getmsgid(struct puffs_mount *pmp) |
315 | { |
316 | uint64_t rv; |
317 | |
318 | mutex_enter(&pmp->pmp_lock); |
319 | rv = pmp->pmp_nextmsgid++; |
320 | mutex_exit(&pmp->pmp_lock); |
321 | |
322 | return rv; |
323 | } |
324 | |
325 | /* |
326 | * A word about reference counting of parks. A reference must be taken |
327 | * when accessing a park and additionally when it is on a queue. So |
328 | * when taking it off a queue and releasing the access reference, the |
329 | * reference count is generally decremented by 2. |
330 | */ |
331 | |
332 | void |
333 | puffs_msg_enqueue(struct puffs_mount *pmp, struct puffs_msgpark *park) |
334 | { |
335 | struct lwp *l = curlwp; |
336 | struct puffs_req *preq, *creq; |
337 | ssize_t delta; |
338 | |
339 | /* |
340 | * Some clients reuse a park, so reset some flags. We might |
341 | * want to provide a caller-side interface for this and add |
342 | * a few more invariant checks here, but this will do for now. |
343 | */ |
344 | park->park_flags &= ~(PARKFLAG_DONE | PARKFLAG_HASERROR); |
345 | KASSERT((park->park_flags & PARKFLAG_WAITERGONE) == 0); |
346 | |
347 | preq = park->park_preq; |
348 | |
349 | #if 1 |
350 | /* check if we do compat adjustments */ |
351 | if (pmp->pmp_docompat && puffs_compat_outgoing(preq, &creq, &delta)) { |
352 | park->park_creq = park->park_preq; |
353 | park->park_creqlen = park->park_maxlen; |
354 | |
355 | park->park_maxlen += delta; |
356 | park->park_copylen += delta; |
357 | park->park_preq = preq = creq; |
358 | } |
359 | #endif |
360 | |
361 | preq->preq_buflen = park->park_maxlen; |
362 | KASSERT(preq->preq_id == 0 |
363 | || (preq->preq_opclass & PUFFSOPFLAG_ISRESPONSE)); |
364 | |
365 | if ((park->park_flags & PARKFLAG_WANTREPLY) == 0) |
366 | preq->preq_opclass |= PUFFSOPFLAG_FAF; |
367 | else |
368 | preq->preq_id = puffs_getmsgid(pmp); |
369 | |
370 | /* fill in caller information */ |
371 | preq->preq_pid = l->l_proc->p_pid; |
372 | preq->preq_lid = l->l_lid; |
373 | |
374 | /* |
375 | * To support cv_sig, yet another movie: check if there are signals |
376 | * pending and we are issueing a non-FAF. If so, return an error |
377 | * directly UNLESS we are issueing INACTIVE/RECLAIM. In that case, |
378 | * convert it to a FAF, fire off to the file server and return |
379 | * an error. Yes, this is bordering disgusting. Barfbags are on me. |
380 | */ |
381 | if (__predict_false((park->park_flags & PARKFLAG_WANTREPLY) |
382 | && (park->park_flags & PARKFLAG_CALL) == 0 |
383 | && (l->l_flag & LW_PENDSIG) != 0 && sigispending(l, 0))) { |
384 | sigset_t ss; |
385 | |
386 | /* |
387 | * see the comment about signals in puffs_msg_wait. |
388 | */ |
389 | sigpending1(l, &ss); |
390 | if (sigismember(&ss, SIGINT) || |
391 | sigismember(&ss, SIGTERM) || |
392 | sigismember(&ss, SIGKILL) || |
393 | sigismember(&ss, SIGHUP) || |
394 | sigismember(&ss, SIGQUIT)) { |
395 | park->park_flags |= PARKFLAG_HASERROR; |
396 | preq->preq_rv = EINTR; |
397 | if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN |
398 | && (preq->preq_optype == PUFFS_VN_INACTIVE |
399 | || preq->preq_optype == PUFFS_VN_RECLAIM)) { |
400 | park->park_preq->preq_opclass |= |
401 | PUFFSOPFLAG_FAF; |
402 | park->park_flags &= ~PARKFLAG_WANTREPLY; |
403 | DPRINTF(("puffs_msg_enqueue: " |
404 | "converted to FAF %p\n" , park)); |
405 | } else { |
406 | return; |
407 | } |
408 | } |
409 | } |
410 | |
411 | mutex_enter(&pmp->pmp_lock); |
412 | if (pmp->pmp_status != PUFFSTAT_RUNNING) { |
413 | mutex_exit(&pmp->pmp_lock); |
414 | park->park_flags |= PARKFLAG_HASERROR; |
415 | preq->preq_rv = ENXIO; |
416 | return; |
417 | } |
418 | |
419 | #ifdef PUFFSDEBUG |
420 | parkqdump(&pmp->pmp_msg_touser, puffsdebug > 1); |
421 | parkqdump(&pmp->pmp_msg_replywait, puffsdebug > 1); |
422 | #endif |
423 | |
424 | /* |
425 | * Note: we don't need to lock park since we have the only |
426 | * reference to it at this point. |
427 | */ |
428 | TAILQ_INSERT_TAIL(&pmp->pmp_msg_touser, park, park_entries); |
429 | park->park_flags |= PARKFLAG_ONQUEUE1; |
430 | pmp->pmp_msg_touser_count++; |
431 | park->park_refcount++; |
432 | mutex_exit(&pmp->pmp_lock); |
433 | |
434 | cv_broadcast(&pmp->pmp_msg_waiter_cv); |
435 | putter_notify(pmp->pmp_pi); |
436 | |
437 | DPRINTF(("touser: req %" PRIu64 ", preq: %p, park: %p, " |
438 | "c/t: 0x%x/0x%x, f: 0x%x\n" , preq->preq_id, preq, park, |
439 | preq->preq_opclass, preq->preq_optype, park->park_flags)); |
440 | } |
441 | |
442 | int |
443 | puffs_msg_wait(struct puffs_mount *pmp, struct puffs_msgpark *park) |
444 | { |
445 | lwp_t *l = curlwp; |
446 | proc_t *p = l->l_proc; |
447 | struct puffs_req *preq = park->park_preq; /* XXX: hmmm */ |
448 | sigset_t ss; |
449 | sigset_t oss; |
450 | int error = 0; |
451 | int rv; |
452 | |
453 | /* |
454 | * block unimportant signals. |
455 | * |
456 | * The set of "important" signals here was chosen to be same as |
457 | * nfs interruptible mount. |
458 | */ |
459 | sigfillset(&ss); |
460 | sigdelset(&ss, SIGINT); |
461 | sigdelset(&ss, SIGTERM); |
462 | sigdelset(&ss, SIGKILL); |
463 | sigdelset(&ss, SIGHUP); |
464 | sigdelset(&ss, SIGQUIT); |
465 | mutex_enter(p->p_lock); |
466 | sigprocmask1(l, SIG_BLOCK, &ss, &oss); |
467 | mutex_exit(p->p_lock); |
468 | |
469 | mutex_enter(&pmp->pmp_lock); |
470 | puffs_mp_reference(pmp); |
471 | mutex_exit(&pmp->pmp_lock); |
472 | |
473 | mutex_enter(&park->park_mtx); |
474 | /* did the response beat us to the wait? */ |
475 | if (__predict_false((park->park_flags & PARKFLAG_DONE) |
476 | || (park->park_flags & PARKFLAG_HASERROR))) { |
477 | rv = park->park_preq->preq_rv; |
478 | mutex_exit(&park->park_mtx); |
479 | goto skipwait; |
480 | } |
481 | |
482 | if ((park->park_flags & PARKFLAG_WANTREPLY) == 0 |
483 | || (park->park_flags & PARKFLAG_CALL)) { |
484 | mutex_exit(&park->park_mtx); |
485 | rv = 0; |
486 | goto skipwait; |
487 | } |
488 | |
489 | error = cv_wait_sig(&park->park_cv, &park->park_mtx); |
490 | DPRINTF(("puffs_touser: waiter for %p woke up with %d\n" , |
491 | park, error)); |
492 | if (error) { |
493 | park->park_flags |= PARKFLAG_WAITERGONE; |
494 | if (park->park_flags & PARKFLAG_DONE) { |
495 | rv = preq->preq_rv; |
496 | mutex_exit(&park->park_mtx); |
497 | } else { |
498 | /* |
499 | * ok, we marked it as going away, but |
500 | * still need to do queue ops. take locks |
501 | * in correct order. |
502 | * |
503 | * We don't want to release our reference |
504 | * if it's on replywait queue to avoid error |
505 | * to file server. putop() code will DTRT. |
506 | */ |
507 | mutex_exit(&park->park_mtx); |
508 | mutex_enter(&pmp->pmp_lock); |
509 | mutex_enter(&park->park_mtx); |
510 | |
511 | /* |
512 | * Still on queue1? We can safely remove it |
513 | * without any consequences since the file |
514 | * server hasn't seen it. "else" we need to |
515 | * wait for the response and just ignore it |
516 | * to avoid signalling an incorrect error to |
517 | * the file server. |
518 | */ |
519 | if (park->park_flags & PARKFLAG_ONQUEUE1) { |
520 | TAILQ_REMOVE(&pmp->pmp_msg_touser, |
521 | park, park_entries); |
522 | puffs_msgpark_release(park); |
523 | pmp->pmp_msg_touser_count--; |
524 | park->park_flags &= ~PARKFLAG_ONQUEUE1; |
525 | } else { |
526 | mutex_exit(&park->park_mtx); |
527 | } |
528 | mutex_exit(&pmp->pmp_lock); |
529 | |
530 | rv = EINTR; |
531 | } |
532 | } else { |
533 | rv = preq->preq_rv; |
534 | mutex_exit(&park->park_mtx); |
535 | } |
536 | |
537 | skipwait: |
538 | mutex_enter(&pmp->pmp_lock); |
539 | puffs_mp_release(pmp); |
540 | mutex_exit(&pmp->pmp_lock); |
541 | |
542 | mutex_enter(p->p_lock); |
543 | sigprocmask1(l, SIG_SETMASK, &oss, NULL); |
544 | mutex_exit(p->p_lock); |
545 | |
546 | return rv; |
547 | } |
548 | |
549 | /* |
550 | * XXX: this suuuucks. Hopefully I'll get rid of this lossage once |
551 | * the whole setback-nonsense gets fixed. |
552 | */ |
553 | int |
554 | puffs_msg_wait2(struct puffs_mount *pmp, struct puffs_msgpark *park, |
555 | struct puffs_node *pn1, struct puffs_node *pn2) |
556 | { |
557 | struct puffs_req *preq; |
558 | int rv; |
559 | |
560 | rv = puffs_msg_wait(pmp, park); |
561 | |
562 | preq = park->park_preq; |
563 | if (pn1 && preq->preq_setbacks & PUFFS_SETBACK_INACT_N1) |
564 | pn1->pn_stat |= PNODE_DOINACT; |
565 | if (pn2 && preq->preq_setbacks & PUFFS_SETBACK_INACT_N2) |
566 | pn2->pn_stat |= PNODE_DOINACT; |
567 | |
568 | if (pn1 && preq->preq_setbacks & PUFFS_SETBACK_NOREF_N1) |
569 | pn1->pn_stat |= PNODE_NOREFS; |
570 | if (pn2 && preq->preq_setbacks & PUFFS_SETBACK_NOREF_N2) |
571 | pn2->pn_stat |= PNODE_NOREFS; |
572 | |
573 | return rv; |
574 | |
575 | } |
576 | |
577 | /* |
578 | * XXX: lazy bum. please, for the love of foie gras, fix me. |
579 | * This should *NOT* depend on setfaf. Also "memcpy" could |
580 | * be done more nicely. |
581 | */ |
582 | void |
583 | puffs_msg_sendresp(struct puffs_mount *pmp, struct puffs_req *origpreq, int rv) |
584 | { |
585 | struct puffs_msgpark *park; |
586 | struct puffs_req *preq; |
587 | |
588 | puffs_msgmem_alloc(sizeof(struct puffs_req), &park, (void *)&preq, 1); |
589 | puffs_msg_setfaf(park); /* XXXXXX: avoids reqid override */ |
590 | |
591 | memcpy(preq, origpreq, sizeof(struct puffs_req)); |
592 | preq->preq_rv = rv; |
593 | preq->preq_opclass |= PUFFSOPFLAG_ISRESPONSE; |
594 | |
595 | puffs_msg_enqueue(pmp, park); |
596 | puffs_msgmem_release(park); |
597 | } |
598 | |
599 | /* |
600 | * Get next request in the outgoing queue. "maxsize" controls the |
601 | * size the caller can accommodate and "nonblock" signals if this |
602 | * should block while waiting for input. Handles all locking internally. |
603 | */ |
604 | int |
605 | puffs_msgif_getout(void *ctx, size_t maxsize, int nonblock, |
606 | uint8_t **data, size_t *dlen, void **parkptr) |
607 | { |
608 | struct puffs_mount *pmp = ctx; |
609 | struct puffs_msgpark *park = NULL; |
610 | struct puffs_req *preq = NULL; |
611 | int error; |
612 | |
613 | error = 0; |
614 | mutex_enter(&pmp->pmp_lock); |
615 | puffs_mp_reference(pmp); |
616 | for (;;) { |
617 | /* RIP? */ |
618 | if (pmp->pmp_status != PUFFSTAT_RUNNING) { |
619 | error = ENXIO; |
620 | break; |
621 | } |
622 | |
623 | /* need platinum yendorian express card? */ |
624 | if (TAILQ_EMPTY(&pmp->pmp_msg_touser)) { |
625 | DPRINTF(("puffs_getout: no outgoing op, " )); |
626 | if (nonblock) { |
627 | DPRINTF(("returning EWOULDBLOCK\n" )); |
628 | error = EWOULDBLOCK; |
629 | break; |
630 | } |
631 | DPRINTF(("waiting ...\n" )); |
632 | |
633 | error = cv_wait_sig(&pmp->pmp_msg_waiter_cv, |
634 | &pmp->pmp_lock); |
635 | if (error) |
636 | break; |
637 | else |
638 | continue; |
639 | } |
640 | |
641 | park = TAILQ_FIRST(&pmp->pmp_msg_touser); |
642 | if (park == NULL) |
643 | continue; |
644 | |
645 | mutex_enter(&park->park_mtx); |
646 | puffs_msgpark_reference(park); |
647 | |
648 | DPRINTF(("puffs_getout: found park at %p, " , park)); |
649 | |
650 | /* If it's a goner, don't process any furher */ |
651 | if (park->park_flags & PARKFLAG_WAITERGONE) { |
652 | DPRINTF(("waitergone!\n" )); |
653 | puffs_msgpark_release(park); |
654 | continue; |
655 | } |
656 | preq = park->park_preq; |
657 | |
658 | #if 0 |
659 | /* check size */ |
660 | /* |
661 | * XXX: this check is not valid for now, we don't know |
662 | * the size of the caller's input buffer. i.e. this |
663 | * will most likely go away |
664 | */ |
665 | if (maxsize < preq->preq_frhdr.pfr_len) { |
666 | DPRINTF(("buffer too small\n" )); |
667 | puffs_msgpark_release(park); |
668 | error = E2BIG; |
669 | break; |
670 | } |
671 | #endif |
672 | |
673 | DPRINTF(("returning\n" )); |
674 | |
675 | /* |
676 | * Ok, we found what we came for. Release it from the |
677 | * outgoing queue but do not unlock. We will unlock |
678 | * only after we "releaseout" it to avoid complications: |
679 | * otherwise it is (theoretically) possible for userland |
680 | * to race us into "put" before we have a change to put |
681 | * this baby on the receiving queue. |
682 | */ |
683 | TAILQ_REMOVE(&pmp->pmp_msg_touser, park, park_entries); |
684 | KASSERT(park->park_flags & PARKFLAG_ONQUEUE1); |
685 | park->park_flags &= ~PARKFLAG_ONQUEUE1; |
686 | mutex_exit(&park->park_mtx); |
687 | |
688 | pmp->pmp_msg_touser_count--; |
689 | KASSERT(pmp->pmp_msg_touser_count >= 0); |
690 | |
691 | break; |
692 | } |
693 | puffs_mp_release(pmp); |
694 | mutex_exit(&pmp->pmp_lock); |
695 | |
696 | if (error == 0) { |
697 | *data = (uint8_t *)preq; |
698 | preq->preq_pth.pth_framelen = park->park_copylen; |
699 | *dlen = preq->preq_pth.pth_framelen; |
700 | *parkptr = park; |
701 | } |
702 | |
703 | return error; |
704 | } |
705 | |
706 | /* |
707 | * Release outgoing structure. Now, depending on the success of the |
708 | * outgoing send, it is either going onto the result waiting queue |
709 | * or the death chamber. |
710 | */ |
711 | void |
712 | puffs_msgif_releaseout(void *ctx, void *parkptr, int status) |
713 | { |
714 | struct puffs_mount *pmp = ctx; |
715 | struct puffs_msgpark *park = parkptr; |
716 | |
717 | DPRINTF(("puffs_releaseout: returning park %p, errno %d: " , |
718 | park, status)); |
719 | mutex_enter(&pmp->pmp_lock); |
720 | mutex_enter(&park->park_mtx); |
721 | if (park->park_flags & PARKFLAG_WANTREPLY) { |
722 | if (status == 0) { |
723 | DPRINTF(("enqueue replywait\n" )); |
724 | TAILQ_INSERT_TAIL(&pmp->pmp_msg_replywait, park, |
725 | park_entries); |
726 | park->park_flags |= PARKFLAG_ONQUEUE2; |
727 | } else { |
728 | DPRINTF(("error path!\n" )); |
729 | park->park_preq->preq_rv = status; |
730 | park->park_flags |= PARKFLAG_DONE; |
731 | cv_signal(&park->park_cv); |
732 | } |
733 | puffs_msgpark_release(park); |
734 | } else { |
735 | DPRINTF(("release\n" )); |
736 | puffs_msgpark_release1(park, 2); |
737 | } |
738 | mutex_exit(&pmp->pmp_lock); |
739 | } |
740 | |
741 | size_t |
742 | puffs_msgif_waitcount(void *ctx) |
743 | { |
744 | struct puffs_mount *pmp = ctx; |
745 | size_t rv; |
746 | |
747 | mutex_enter(&pmp->pmp_lock); |
748 | rv = pmp->pmp_msg_touser_count; |
749 | mutex_exit(&pmp->pmp_lock); |
750 | |
751 | return rv; |
752 | } |
753 | |
754 | /* |
755 | * XXX: locking with this one? |
756 | */ |
757 | static void |
758 | puffsop_msg(void *ctx, struct puffs_req *preq) |
759 | { |
760 | struct puffs_mount *pmp = ctx; |
761 | struct putter_hdr *pth = &preq->preq_pth; |
762 | struct puffs_msgpark *park; |
763 | int wgone; |
764 | |
765 | mutex_enter(&pmp->pmp_lock); |
766 | |
767 | /* Locate waiter */ |
768 | TAILQ_FOREACH(park, &pmp->pmp_msg_replywait, park_entries) { |
769 | if (park->park_preq->preq_id == preq->preq_id) |
770 | break; |
771 | } |
772 | if (park == NULL) { |
773 | DPRINTF(("puffsop_msg: no request: %" PRIu64 "\n" , |
774 | preq->preq_id)); |
775 | mutex_exit(&pmp->pmp_lock); |
776 | return; /* XXX send error */ |
777 | } |
778 | |
779 | mutex_enter(&park->park_mtx); |
780 | puffs_msgpark_reference(park); |
781 | if (pth->pth_framelen > park->park_maxlen) { |
782 | DPRINTF(("puffsop_msg: invalid buffer length: " |
783 | "%" PRIu64 " (req %" PRIu64 ", \n" , pth->pth_framelen, |
784 | preq->preq_id)); |
785 | park->park_preq->preq_rv = EPROTO; |
786 | cv_signal(&park->park_cv); |
787 | puffs_msgpark_release1(park, 2); |
788 | mutex_exit(&pmp->pmp_lock); |
789 | return; /* XXX: error */ |
790 | } |
791 | wgone = park->park_flags & PARKFLAG_WAITERGONE; |
792 | |
793 | KASSERT(park->park_flags & PARKFLAG_ONQUEUE2); |
794 | TAILQ_REMOVE(&pmp->pmp_msg_replywait, park, park_entries); |
795 | park->park_flags &= ~PARKFLAG_ONQUEUE2; |
796 | mutex_exit(&pmp->pmp_lock); |
797 | |
798 | if (wgone) { |
799 | DPRINTF(("puffsop_msg: bad service - waiter gone for " |
800 | "park %p\n" , park)); |
801 | } else { |
802 | #if 1 |
803 | if (park->park_creq) { |
804 | struct puffs_req *creq; |
805 | size_t csize; |
806 | |
807 | KASSERT(pmp->pmp_docompat); |
808 | puffs_compat_incoming(preq, park->park_creq); |
809 | creq = park->park_creq; |
810 | csize = park->park_creqlen; |
811 | park->park_creq = park->park_preq; |
812 | park->park_creqlen = park->park_maxlen; |
813 | |
814 | park->park_preq = creq; |
815 | park->park_maxlen = csize; |
816 | |
817 | memcpy(park->park_creq, preq, pth->pth_framelen); |
818 | } else { |
819 | #endif |
820 | memcpy(park->park_preq, preq, pth->pth_framelen); |
821 | } |
822 | |
823 | if (park->park_flags & PARKFLAG_CALL) { |
824 | DPRINTF(("puffsop_msg: call for %p, arg %p\n" , |
825 | park->park_preq, park->park_donearg)); |
826 | park->park_done(pmp, preq, park->park_donearg); |
827 | } |
828 | } |
829 | |
830 | if (!wgone) { |
831 | DPRINTF(("puffs_putop: flagging done for " |
832 | "park %p\n" , park)); |
833 | cv_signal(&park->park_cv); |
834 | } |
835 | |
836 | park->park_flags |= PARKFLAG_DONE; |
837 | puffs_msgpark_release1(park, 2); |
838 | } |
839 | |
840 | /* |
841 | * Node expiry. We come here after an inactive on an unexpired node. |
842 | * The expiry has been queued and is done in sop thread. |
843 | */ |
844 | static void |
845 | puffsop_expire(struct puffs_mount *pmp, puffs_cookie_t cookie) |
846 | { |
847 | struct vnode *vp; |
848 | |
849 | KASSERT(PUFFS_USE_FS_TTL(pmp)); |
850 | |
851 | /* |
852 | * If it still exists and has no reference, |
853 | * vrele should cause it to be reclaimed. |
854 | * Otherwise, we have nothing to do. |
855 | */ |
856 | if (puffs_cookie2vnode(pmp, cookie, &vp) == 0) { |
857 | VPTOPP(vp)->pn_stat &= ~PNODE_SOPEXP; |
858 | vrele(vp); |
859 | } |
860 | |
861 | return; |
862 | } |
863 | |
864 | static void |
865 | puffsop_flush(struct puffs_mount *pmp, struct puffs_flush *pf) |
866 | { |
867 | struct vnode *vp; |
868 | voff_t offlo, offhi; |
869 | int rv, flags = 0; |
870 | |
871 | KASSERT(pf->pf_req.preq_pth.pth_framelen == sizeof(struct puffs_flush)); |
872 | |
873 | /* XXX: slurry */ |
874 | if (pf->pf_op == PUFFS_INVAL_NAMECACHE_ALL) { |
875 | cache_purgevfs(PMPTOMP(pmp)); |
876 | rv = 0; |
877 | goto out; |
878 | } |
879 | |
880 | /* |
881 | * Get vnode, don't lock it. Namecache is protected by its own lock |
882 | * and we have a reference to protect against premature harvesting. |
883 | * |
884 | * The node we want here might be locked and the op is in |
885 | * userspace waiting for us to complete ==> deadlock. Another |
886 | * reason we need to eventually bump locking to userspace, as we |
887 | * will need to lock the node if we wish to do flushes. |
888 | */ |
889 | rv = puffs_cookie2vnode(pmp, pf->pf_cookie, &vp); |
890 | if (rv) { |
891 | if (rv == PUFFS_NOSUCHCOOKIE) |
892 | rv = ENOENT; |
893 | goto out; |
894 | } |
895 | |
896 | switch (pf->pf_op) { |
897 | #if 0 |
898 | /* not quite ready, yet */ |
899 | case PUFFS_INVAL_NAMECACHE_NODE: |
900 | struct componentname *pf_cn; |
901 | char *name; |
902 | /* get comfortab^Wcomponentname */ |
903 | pf_cn = kmem_alloc(componentname); |
904 | memset(pf_cn, 0, sizeof(struct componentname)); |
905 | break; |
906 | |
907 | #endif |
908 | case PUFFS_INVAL_NAMECACHE_DIR: |
909 | if (vp->v_type != VDIR) { |
910 | rv = EINVAL; |
911 | break; |
912 | } |
913 | cache_purge1(vp, NULL, 0, PURGE_CHILDREN); |
914 | break; |
915 | |
916 | case PUFFS_INVAL_PAGECACHE_NODE_RANGE: |
917 | flags = PGO_FREE; |
918 | /*FALLTHROUGH*/ |
919 | case PUFFS_FLUSH_PAGECACHE_NODE_RANGE: |
920 | if (flags == 0) |
921 | flags = PGO_CLEANIT; |
922 | |
923 | if (pf->pf_end > vp->v_size || vp->v_type != VREG) { |
924 | rv = EINVAL; |
925 | break; |
926 | } |
927 | |
928 | offlo = trunc_page(pf->pf_start); |
929 | offhi = round_page(pf->pf_end); |
930 | if (offhi != 0 && offlo >= offhi) { |
931 | rv = EINVAL; |
932 | break; |
933 | } |
934 | |
935 | mutex_enter(vp->v_uobj.vmobjlock); |
936 | rv = VOP_PUTPAGES(vp, offlo, offhi, flags); |
937 | break; |
938 | |
939 | default: |
940 | rv = EINVAL; |
941 | } |
942 | |
943 | vrele(vp); |
944 | |
945 | out: |
946 | puffs_msg_sendresp(pmp, &pf->pf_req, rv); |
947 | } |
948 | |
949 | int |
950 | puffs_msgif_dispatch(void *ctx, struct putter_hdr *pth) |
951 | { |
952 | struct puffs_mount *pmp = ctx; |
953 | struct puffs_req *preq = (struct puffs_req *)pth; |
954 | struct puffs_sopreq *psopr; |
955 | |
956 | if (pth->pth_framelen < sizeof(struct puffs_req)) { |
957 | puffs_msg_sendresp(pmp, preq, EINVAL); /* E2SMALL */ |
958 | return 0; |
959 | } |
960 | |
961 | switch (PUFFSOP_OPCLASS(preq->preq_opclass)) { |
962 | case PUFFSOP_VN: |
963 | case PUFFSOP_VFS: |
964 | DPRINTF(("dispatch: vn/vfs message 0x%x\n" , preq->preq_optype)); |
965 | puffsop_msg(pmp, preq); |
966 | break; |
967 | |
968 | case PUFFSOP_FLUSH: /* process in sop thread */ |
969 | { |
970 | struct puffs_flush *pf; |
971 | |
972 | DPRINTF(("dispatch: flush 0x%x\n" , preq->preq_optype)); |
973 | |
974 | if (preq->preq_pth.pth_framelen != sizeof(struct puffs_flush)) { |
975 | puffs_msg_sendresp(pmp, preq, EINVAL); /* E2SMALL */ |
976 | break; |
977 | } |
978 | pf = (struct puffs_flush *)preq; |
979 | |
980 | KASSERT(curlwp != uvm.pagedaemon_lwp); |
981 | psopr = kmem_alloc(sizeof(*psopr), KM_SLEEP); |
982 | memcpy(&psopr->psopr_pf, pf, sizeof(*pf)); |
983 | psopr->psopr_sopreq = PUFFS_SOPREQ_FLUSH; |
984 | |
985 | mutex_enter(&pmp->pmp_sopmtx); |
986 | if (pmp->pmp_sopthrcount == 0) { |
987 | mutex_exit(&pmp->pmp_sopmtx); |
988 | kmem_free(psopr, sizeof(*psopr)); |
989 | puffs_msg_sendresp(pmp, preq, ENXIO); |
990 | } else { |
991 | TAILQ_INSERT_TAIL(&pmp->pmp_sopfastreqs, |
992 | psopr, psopr_entries); |
993 | cv_signal(&pmp->pmp_sopcv); |
994 | mutex_exit(&pmp->pmp_sopmtx); |
995 | } |
996 | break; |
997 | } |
998 | |
999 | case PUFFSOP_UNMOUNT: /* process in sop thread */ |
1000 | { |
1001 | |
1002 | DPRINTF(("dispatch: unmount 0x%x\n" , preq->preq_optype)); |
1003 | |
1004 | KASSERT(curlwp != uvm.pagedaemon_lwp); |
1005 | psopr = kmem_alloc(sizeof(*psopr), KM_SLEEP); |
1006 | psopr->psopr_preq = *preq; |
1007 | psopr->psopr_sopreq = PUFFS_SOPREQ_UNMOUNT; |
1008 | |
1009 | mutex_enter(&pmp->pmp_sopmtx); |
1010 | if (pmp->pmp_sopthrcount == 0) { |
1011 | mutex_exit(&pmp->pmp_sopmtx); |
1012 | kmem_free(psopr, sizeof(*psopr)); |
1013 | puffs_msg_sendresp(pmp, preq, ENXIO); |
1014 | } else { |
1015 | TAILQ_INSERT_TAIL(&pmp->pmp_sopfastreqs, |
1016 | psopr, psopr_entries); |
1017 | cv_signal(&pmp->pmp_sopcv); |
1018 | mutex_exit(&pmp->pmp_sopmtx); |
1019 | } |
1020 | break; |
1021 | } |
1022 | |
1023 | default: |
1024 | DPRINTF(("dispatch: invalid opclass 0x%x\n" , preq->preq_opclass)); |
1025 | puffs_msg_sendresp(pmp, preq, EOPNOTSUPP); |
1026 | break; |
1027 | } |
1028 | |
1029 | return 0; |
1030 | } |
1031 | |
1032 | /* |
1033 | * Work loop for thread processing all ops from server which |
1034 | * cannot safely be handled in caller context. This includes |
1035 | * everything which might need a lock currently "held" by the file |
1036 | * server, i.e. a long-term kernel lock which will be released only |
1037 | * once the file server acknowledges a request |
1038 | */ |
1039 | #define TIMED_OUT(expire) \ |
1040 | ((int)((unsigned int)hardclock_ticks - (unsigned int)expire) > 0) |
1041 | void |
1042 | puffs_sop_thread(void *arg) |
1043 | { |
1044 | struct puffs_mount *pmp = arg; |
1045 | struct mount *mp = PMPTOMP(pmp); |
1046 | struct puffs_sopreq *psopr; |
1047 | bool keeprunning; |
1048 | bool unmountme = false; |
1049 | int timeo; |
1050 | |
1051 | timeo = PUFFS_USE_FS_TTL(pmp) ? puffs_sopreq_expire_timeout : 0; |
1052 | |
1053 | mutex_enter(&pmp->pmp_sopmtx); |
1054 | for (keeprunning = true; keeprunning; ) { |
1055 | /* |
1056 | * We have a fast queue for flush and umount, and a node |
1057 | * queue for delayes node reclaims. Requests on node queue * are not honoured before clock reaches psopr_at. This |
1058 | * code assumes that requests are ordered by psopr_at. |
1059 | */ |
1060 | do { |
1061 | psopr = TAILQ_FIRST(&pmp->pmp_sopfastreqs); |
1062 | if (psopr != NULL) { |
1063 | TAILQ_REMOVE(&pmp->pmp_sopfastreqs, |
1064 | psopr, psopr_entries); |
1065 | break; |
1066 | } |
1067 | |
1068 | psopr = TAILQ_FIRST(&pmp->pmp_sopnodereqs); |
1069 | if ((psopr != NULL) && TIMED_OUT(psopr->psopr_at)) { |
1070 | TAILQ_REMOVE(&pmp->pmp_sopnodereqs, |
1071 | psopr, psopr_entries); |
1072 | break; |
1073 | } |
1074 | |
1075 | cv_timedwait(&pmp->pmp_sopcv, &pmp->pmp_sopmtx, timeo); |
1076 | } while (1 /* CONSTCOND */); |
1077 | |
1078 | mutex_exit(&pmp->pmp_sopmtx); |
1079 | |
1080 | switch (psopr->psopr_sopreq) { |
1081 | case PUFFS_SOPREQSYS_EXIT: |
1082 | keeprunning = false; |
1083 | break; |
1084 | case PUFFS_SOPREQ_FLUSH: |
1085 | puffsop_flush(pmp, &psopr->psopr_pf); |
1086 | break; |
1087 | case PUFFS_SOPREQ_EXPIRE: |
1088 | puffsop_expire(pmp, psopr->psopr_ck); |
1089 | break; |
1090 | case PUFFS_SOPREQ_UNMOUNT: |
1091 | puffs_msg_sendresp(pmp, &psopr->psopr_preq, 0); |
1092 | |
1093 | unmountme = true; |
1094 | keeprunning = false; |
1095 | |
1096 | /* |
1097 | * We know the mountpoint is still alive because |
1098 | * the thread that is us (poetic?) is still alive. |
1099 | */ |
1100 | atomic_inc_uint((unsigned int*)&mp->mnt_refcnt); |
1101 | break; |
1102 | } |
1103 | |
1104 | kmem_free(psopr, sizeof(*psopr)); |
1105 | mutex_enter(&pmp->pmp_sopmtx); |
1106 | } |
1107 | |
1108 | /* |
1109 | * Purge remaining ops. |
1110 | */ |
1111 | while ((psopr = TAILQ_FIRST(&pmp->pmp_sopfastreqs)) != NULL) { |
1112 | TAILQ_REMOVE(&pmp->pmp_sopfastreqs, psopr, psopr_entries); |
1113 | mutex_exit(&pmp->pmp_sopmtx); |
1114 | puffs_msg_sendresp(pmp, &psopr->psopr_preq, ENXIO); |
1115 | kmem_free(psopr, sizeof(*psopr)); |
1116 | mutex_enter(&pmp->pmp_sopmtx); |
1117 | } |
1118 | |
1119 | while ((psopr = TAILQ_FIRST(&pmp->pmp_sopnodereqs)) != NULL) { |
1120 | TAILQ_REMOVE(&pmp->pmp_sopnodereqs, psopr, psopr_entries); |
1121 | mutex_exit(&pmp->pmp_sopmtx); |
1122 | KASSERT(psopr->psopr_sopreq == PUFFS_SOPREQ_EXPIRE); |
1123 | kmem_free(psopr, sizeof(*psopr)); |
1124 | mutex_enter(&pmp->pmp_sopmtx); |
1125 | } |
1126 | |
1127 | pmp->pmp_sopthrcount--; |
1128 | cv_broadcast(&pmp->pmp_sopcv); |
1129 | mutex_exit(&pmp->pmp_sopmtx); /* not allowed to access fs after this */ |
1130 | |
1131 | /* |
1132 | * If unmount was requested, we can now safely do it here, since |
1133 | * our context is dead from the point-of-view of puffs_unmount() |
1134 | * and we are just another thread. dounmount() makes internally |
1135 | * sure that VFS_UNMOUNT() isn't called reentrantly and that it |
1136 | * is eventually completed. |
1137 | */ |
1138 | if (unmountme) { |
1139 | (void)dounmount(mp, MNT_FORCE, curlwp); |
1140 | vfs_destroy(mp); |
1141 | } |
1142 | |
1143 | kthread_exit(0); |
1144 | } |
1145 | |
1146 | int |
1147 | puffs_msgif_close(void *ctx) |
1148 | { |
1149 | struct puffs_mount *pmp = ctx; |
1150 | struct mount *mp = PMPTOMP(pmp); |
1151 | |
1152 | mutex_enter(&pmp->pmp_lock); |
1153 | puffs_mp_reference(pmp); |
1154 | |
1155 | /* |
1156 | * Free the waiting callers before proceeding any further. |
1157 | * The syncer might be jogging around in this file system |
1158 | * currently. If we allow it to go to the userspace of no |
1159 | * return while trying to get the syncer lock, well ... |
1160 | */ |
1161 | puffs_userdead(pmp); |
1162 | |
1163 | /* |
1164 | * Make sure someone from puffs_unmount() isn't currently in |
1165 | * userspace. If we don't take this precautionary step, |
1166 | * they might notice that the mountpoint has disappeared |
1167 | * from under them once they return. Especially note that we |
1168 | * cannot simply test for an unmounter before calling |
1169 | * dounmount(), since it might be possible that that particular |
1170 | * invocation of unmount was called without MNT_FORCE. Here we |
1171 | * *must* make sure unmount succeeds. Also, restart is necessary |
1172 | * since pmp isn't locked. We might end up with PUTTER_DEAD after |
1173 | * restart and exit from there. |
1174 | */ |
1175 | if (pmp->pmp_unmounting) { |
1176 | cv_wait(&pmp->pmp_unmounting_cv, &pmp->pmp_lock); |
1177 | puffs_mp_release(pmp); |
1178 | mutex_exit(&pmp->pmp_lock); |
1179 | DPRINTF(("puffs_fop_close: unmount was in progress for pmp %p, " |
1180 | "restart\n" , pmp)); |
1181 | return ERESTART; |
1182 | } |
1183 | |
1184 | /* Won't access pmp from here anymore */ |
1185 | atomic_inc_uint((unsigned int*)&mp->mnt_refcnt); |
1186 | puffs_mp_release(pmp); |
1187 | mutex_exit(&pmp->pmp_lock); |
1188 | |
1189 | /* Detach from VFS. */ |
1190 | (void)dounmount(mp, MNT_FORCE, curlwp); |
1191 | vfs_destroy(mp); |
1192 | |
1193 | return 0; |
1194 | } |
1195 | |
1196 | /* |
1197 | * We're dead, kaput, RIP, slightly more than merely pining for the |
1198 | * fjords, belly-up, fallen, lifeless, finished, expired, gone to meet |
1199 | * our maker, ceased to be, etcetc. YASD. It's a dead FS! |
1200 | * |
1201 | * Caller must hold puffs mutex. |
1202 | */ |
1203 | void |
1204 | puffs_userdead(struct puffs_mount *pmp) |
1205 | { |
1206 | struct puffs_msgpark *park, *park_next; |
1207 | |
1208 | /* |
1209 | * Mark filesystem status as dying so that operations don't |
1210 | * attempt to march to userspace any longer. |
1211 | */ |
1212 | pmp->pmp_status = PUFFSTAT_DYING; |
1213 | |
1214 | /* signal waiters on REQUEST TO file server queue */ |
1215 | for (park = TAILQ_FIRST(&pmp->pmp_msg_touser); park; park = park_next) { |
1216 | |
1217 | mutex_enter(&park->park_mtx); |
1218 | puffs_msgpark_reference(park); |
1219 | park_next = TAILQ_NEXT(park, park_entries); |
1220 | |
1221 | KASSERT(park->park_flags & PARKFLAG_ONQUEUE1); |
1222 | TAILQ_REMOVE(&pmp->pmp_msg_touser, park, park_entries); |
1223 | park->park_flags &= ~PARKFLAG_ONQUEUE1; |
1224 | pmp->pmp_msg_touser_count--; |
1225 | |
1226 | /* |
1227 | * Even though waiters on QUEUE1 are removed in touser() |
1228 | * in case of WAITERGONE, it is still possible for us to |
1229 | * get raced here due to having to retake locks in said |
1230 | * touser(). In the race case simply "ignore" the item |
1231 | * on the queue and move on to the next one. |
1232 | */ |
1233 | if (park->park_flags & PARKFLAG_WAITERGONE) { |
1234 | KASSERT((park->park_flags & PARKFLAG_CALL) == 0); |
1235 | KASSERT(park->park_flags & PARKFLAG_WANTREPLY); |
1236 | puffs_msgpark_release(park); |
1237 | |
1238 | } else { |
1239 | park->park_preq->preq_rv = ENXIO; |
1240 | |
1241 | if (park->park_flags & PARKFLAG_CALL) { |
1242 | park->park_done(pmp, park->park_preq, |
1243 | park->park_donearg); |
1244 | puffs_msgpark_release1(park, 2); |
1245 | } else if ((park->park_flags & PARKFLAG_WANTREPLY)==0) { |
1246 | puffs_msgpark_release1(park, 2); |
1247 | } else { |
1248 | park->park_preq->preq_rv = ENXIO; |
1249 | cv_signal(&park->park_cv); |
1250 | puffs_msgpark_release(park); |
1251 | } |
1252 | } |
1253 | } |
1254 | |
1255 | /* signal waiters on RESPONSE FROM file server queue */ |
1256 | for (park=TAILQ_FIRST(&pmp->pmp_msg_replywait); park; park=park_next) { |
1257 | mutex_enter(&park->park_mtx); |
1258 | puffs_msgpark_reference(park); |
1259 | park_next = TAILQ_NEXT(park, park_entries); |
1260 | |
1261 | KASSERT(park->park_flags & PARKFLAG_ONQUEUE2); |
1262 | KASSERT(park->park_flags & PARKFLAG_WANTREPLY); |
1263 | |
1264 | TAILQ_REMOVE(&pmp->pmp_msg_replywait, park, park_entries); |
1265 | park->park_flags &= ~PARKFLAG_ONQUEUE2; |
1266 | |
1267 | if (park->park_flags & PARKFLAG_WAITERGONE) { |
1268 | KASSERT((park->park_flags & PARKFLAG_CALL) == 0); |
1269 | puffs_msgpark_release(park); |
1270 | } else { |
1271 | park->park_preq->preq_rv = ENXIO; |
1272 | if (park->park_flags & PARKFLAG_CALL) { |
1273 | park->park_done(pmp, park->park_preq, |
1274 | park->park_donearg); |
1275 | puffs_msgpark_release1(park, 2); |
1276 | } else { |
1277 | cv_signal(&park->park_cv); |
1278 | puffs_msgpark_release(park); |
1279 | } |
1280 | } |
1281 | } |
1282 | |
1283 | cv_broadcast(&pmp->pmp_msg_waiter_cv); |
1284 | } |
1285 | |