Annotation of src/sys/fs/puffs/puffs_msgif.c, Revision 1.75
1.75 ! pooka 1: /* $NetBSD: puffs_msgif.c,v 1.74 2009/11/05 19:42:44 pooka Exp $ */
1.1 pooka 2:
3: /*
1.16 pooka 4: * Copyright (c) 2005, 2006, 2007 Antti Kantee. All Rights Reserved.
1.1 pooka 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>
1.75 ! pooka 33: __KERNEL_RCSID(0, "$NetBSD: puffs_msgif.c,v 1.74 2009/11/05 19:42:44 pooka Exp $");
1.1 pooka 34:
35: #include <sys/param.h>
1.68 tnn 36: #include <sys/atomic.h>
1.46 pooka 37: #include <sys/kmem.h>
1.53 pooka 38: #include <sys/kthread.h>
39: #include <sys/lock.h>
1.1 pooka 40: #include <sys/malloc.h>
41: #include <sys/mount.h>
1.53 pooka 42: #include <sys/namei.h>
43: #include <sys/proc.h>
1.1 pooka 44: #include <sys/vnode.h>
1.71 ad 45: #include <sys/atomic.h>
1.53 pooka 46:
1.55 pooka 47: #include <dev/putter/putter_sys.h>
1.1 pooka 48:
49: #include <fs/puffs/puffs_msgif.h>
50: #include <fs/puffs/puffs_sys.h>
51:
1.53 pooka 52: #include <miscfs/syncfs/syncfs.h> /* XXX: for syncer_mutex reference */
53:
1.22 pooka 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: */
1.46 pooka 62: struct puffs_msgpark {
1.22 pooka 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 */
1.24 pooka 67:
1.46 pooka 68: parkdone_fn park_done; /* "biodone" a'la puffs */
1.24 pooka 69: void *park_donearg;
1.22 pooka 70:
71: int park_flags;
1.26 pooka 72: int park_refcount;
1.22 pooka 73:
74: kcondvar_t park_cv;
1.26 pooka 75: kmutex_t park_mtx;
76:
1.46 pooka 77: TAILQ_ENTRY(puffs_msgpark) park_entries;
1.22 pooka 78: };
79: #define PARKFLAG_WAITERGONE 0x01
1.26 pooka 80: #define PARKFLAG_DONE 0x02
81: #define PARKFLAG_ONQUEUE1 0x04
82: #define PARKFLAG_ONQUEUE2 0x08
83: #define PARKFLAG_CALL 0x10
1.31 pooka 84: #define PARKFLAG_WANTREPLY 0x20
1.57 pooka 85: #define PARKFLAG_HASERROR 0x40
1.22 pooka 86:
1.52 ad 87: static pool_cache_t parkpc;
1.57 pooka 88: #ifdef PUFFSDEBUG
89: static int totalpark;
90: #endif
1.22 pooka 91:
92: static int
93: makepark(void *arg, void *obj, int flags)
94: {
1.46 pooka 95: struct puffs_msgpark *park = obj;
1.22 pooka 96:
1.26 pooka 97: mutex_init(&park->park_mtx, MUTEX_DEFAULT, IPL_NONE);
1.22 pooka 98: cv_init(&park->park_cv, "puffsrpl");
99:
100: return 0;
101: }
102:
103: static void
104: nukepark(void *arg, void *obj)
105: {
1.46 pooka 106: struct puffs_msgpark *park = obj;
1.22 pooka 107:
108: cv_destroy(&park->park_cv);
1.26 pooka 109: mutex_destroy(&park->park_mtx);
1.22 pooka 110: }
111:
112: void
1.73 cegger 113: puffs_msgif_init(void)
1.22 pooka 114: {
115:
1.52 ad 116: parkpc = pool_cache_init(sizeof(struct puffs_msgpark), 0, 0, 0,
117: "puffprkl", NULL, IPL_NONE, makepark, nukepark, NULL);
1.22 pooka 118: }
119:
120: void
1.73 cegger 121: puffs_msgif_destroy(void)
1.22 pooka 122: {
123:
1.52 ad 124: pool_cache_destroy(parkpc);
1.22 pooka 125: }
126:
1.46 pooka 127: static int alloced;
128:
129: static struct puffs_msgpark *
130: puffs_msgpark_alloc(int waitok)
1.26 pooka 131: {
1.46 pooka 132: struct puffs_msgpark *park;
1.26 pooka 133:
1.52 ad 134: park = pool_cache_get(parkpc, waitok ? PR_WAITOK : PR_NOWAIT);
1.46 pooka 135: if (park == NULL)
136: return park;
137:
138: park->park_refcount = 1;
139: park->park_preq = NULL;
140: park->park_flags = PARKFLAG_WANTREPLY;
1.26 pooka 141:
1.57 pooka 142: #ifdef PUFFSDEBUG
143: totalpark++;
144: #endif
145:
1.26 pooka 146: return park;
147: }
148:
149: static void
1.46 pooka 150: puffs_msgpark_reference(struct puffs_msgpark *park)
1.22 pooka 151: {
152:
1.46 pooka 153: KASSERT(mutex_owned(&park->park_mtx));
1.26 pooka 154: park->park_refcount++;
1.22 pooka 155: }
156:
1.46 pooka 157: /*
158: * Release reference to park structure.
159: */
160: static void
161: puffs_msgpark_release1(struct puffs_msgpark *park, int howmany)
1.22 pooka 162: {
1.46 pooka 163: struct puffs_req *preq = park->park_preq;
164: int refcnt;
1.22 pooka 165:
1.26 pooka 166: KASSERT(mutex_owned(&park->park_mtx));
1.46 pooka 167: refcnt = park->park_refcount -= howmany;
168: mutex_exit(&park->park_mtx);
169:
170: KASSERT(refcnt >= 0);
1.26 pooka 171:
1.46 pooka 172: if (refcnt == 0) {
173: alloced--;
174: if (preq)
175: kmem_free(preq, park->park_maxlen);
1.52 ad 176: pool_cache_put(parkpc, park);
1.57 pooka 177:
178: #ifdef PUFFSDEBUG
179: totalpark--;
180: #endif
1.46 pooka 181: }
1.22 pooka 182: }
1.46 pooka 183: #define puffs_msgpark_release(a) puffs_msgpark_release1(a, 1)
1.22 pooka 184:
1.26 pooka 185: #ifdef PUFFSDEBUG
186: static void
1.46 pooka 187: parkdump(struct puffs_msgpark *park)
1.26 pooka 188: {
189:
190: DPRINTF(("park %p, preq %p, id %" PRIu64 "\n"
191: "\tcopy %zu, max %zu - done: %p/%p\n"
192: "\tflags 0x%08x, refcount %d, cv/mtx: %p/%p\n",
1.46 pooka 193: park, park->park_preq, park->park_preq->preq_id,
1.26 pooka 194: park->park_copylen, park->park_maxlen,
195: park->park_done, park->park_donearg,
196: park->park_flags, park->park_refcount,
197: &park->park_cv, &park->park_mtx));
198: }
199:
200: static void
201: parkqdump(struct puffs_wq *q, int dumpall)
202: {
1.46 pooka 203: struct puffs_msgpark *park;
1.26 pooka 204: int total = 0;
205:
206: TAILQ_FOREACH(park, q, park_entries) {
207: if (dumpall)
208: parkdump(park);
209: total++;
210: }
1.29 pooka 211: DPRINTF(("puffs waitqueue at %p dumped, %d total\n", q, total));
1.26 pooka 212:
213: }
214: #endif /* PUFFSDEBUG */
1.22 pooka 215:
216: /*
1.46 pooka 217: * A word about locking in the park structures: the lock protects the
218: * fields of the *park* structure (not preq) and acts as an interlock
219: * in cv operations. The lock is always internal to this module and
220: * callers do not need to worry about it.
1.22 pooka 221: */
1.46 pooka 222:
223: int
224: puffs_msgmem_alloc(size_t len, struct puffs_msgpark **ppark, void **mem,
225: int cansleep)
226: {
227: struct puffs_msgpark *park;
228: void *m;
229:
230: m = kmem_zalloc(len, cansleep ? KM_SLEEP : KM_NOSLEEP);
231: if (m == NULL) {
232: KASSERT(cansleep == 0);
233: return ENOMEM;
234: }
235:
236: park = puffs_msgpark_alloc(cansleep);
237: if (park == NULL) {
238: KASSERT(cansleep == 0);
239: kmem_free(m, len);
240: return ENOMEM;
241: }
242:
243: park->park_preq = m;
1.57 pooka 244: park->park_maxlen = park->park_copylen = len;
1.46 pooka 245:
246: *ppark = park;
247: *mem = m;
248:
249: return 0;
250: }
251:
252: void
253: puffs_msgmem_release(struct puffs_msgpark *park)
1.22 pooka 254: {
255:
1.46 pooka 256: if (park == NULL)
257: return;
1.22 pooka 258:
1.46 pooka 259: mutex_enter(&park->park_mtx);
260: puffs_msgpark_release(park);
261: }
1.22 pooka 262:
1.46 pooka 263: void
264: puffs_msg_setfaf(struct puffs_msgpark *park)
265: {
1.22 pooka 266:
1.57 pooka 267: KASSERT((park->park_flags & PARKFLAG_CALL) == 0);
1.36 pooka 268: park->park_flags &= ~PARKFLAG_WANTREPLY;
1.22 pooka 269: }
270:
1.57 pooka 271: void
272: puffs_msg_setdelta(struct puffs_msgpark *park, size_t delta)
1.1 pooka 273: {
274:
1.57 pooka 275: KASSERT(delta < park->park_maxlen); /* "<=" wouldn't make sense */
276: park->park_copylen = park->park_maxlen - delta;
1.1 pooka 277: }
278:
1.57 pooka 279: void
1.64 pooka 280: puffs_msg_setinfo(struct puffs_msgpark *park, int class, int type,
281: puffs_cookie_t ck)
1.1 pooka 282: {
283:
1.57 pooka 284: park->park_preq->preq_opclass = PUFFSOP_OPCLASS(class);
285: park->park_preq->preq_optype = type;
1.64 pooka 286: park->park_preq->preq_cookie = ck;
1.1 pooka 287: }
288:
1.24 pooka 289: void
1.57 pooka 290: puffs_msg_setcall(struct puffs_msgpark *park, parkdone_fn donefn, void *donearg)
1.1 pooka 291: {
1.25 pooka 292:
1.57 pooka 293: KASSERT(park->park_flags & PARKFLAG_WANTREPLY);
1.25 pooka 294: park->park_done = donefn;
295: park->park_donearg = donearg;
1.46 pooka 296: park->park_flags |= PARKFLAG_CALL;
1.20 pooka 297: }
298:
1.57 pooka 299: /*
300: * kernel-user-kernel waitqueues
301: */
1.4 pooka 302:
1.57 pooka 303: static uint64_t
304: puffs_getmsgid(struct puffs_mount *pmp)
1.41 pooka 305: {
1.57 pooka 306: uint64_t rv;
1.41 pooka 307:
1.57 pooka 308: mutex_enter(&pmp->pmp_lock);
309: rv = pmp->pmp_nextmsgid++;
310: mutex_exit(&pmp->pmp_lock);
1.41 pooka 311:
1.57 pooka 312: return rv;
1.41 pooka 313: }
314:
1.4 pooka 315: /*
1.57 pooka 316: * A word about reference counting of parks. A reference must be taken
317: * when accessing a park and additionally when it is on a queue. So
318: * when taking it off a queue and releasing the access reference, the
319: * reference count is generally decremented by 2.
1.1 pooka 320: */
1.57 pooka 321:
322: void
323: puffs_msg_enqueue(struct puffs_mount *pmp, struct puffs_msgpark *park)
1.1 pooka 324: {
1.26 pooka 325: struct lwp *l = curlwp;
1.16 pooka 326: struct mount *mp;
1.9 pooka 327: struct puffs_req *preq;
1.1 pooka 328:
1.16 pooka 329: mp = PMPTOMP(pmp);
1.25 pooka 330: preq = park->park_preq;
1.46 pooka 331: preq->preq_buflen = park->park_maxlen;
1.61 pooka 332: KASSERT(preq->preq_id == 0
333: || (preq->preq_opclass & PUFFSOPFLAG_ISRESPONSE));
1.46 pooka 334:
335: if ((park->park_flags & PARKFLAG_WANTREPLY) == 0)
336: preq->preq_opclass |= PUFFSOPFLAG_FAF;
337: else
338: preq->preq_id = puffs_getmsgid(pmp);
1.31 pooka 339:
1.49 pooka 340: /* fill in caller information */
341: preq->preq_pid = l->l_proc->p_pid;
342: preq->preq_lid = l->l_lid;
343:
1.19 pooka 344: /*
1.51 pooka 345: * To support cv_sig, yet another movie: check if there are signals
1.19 pooka 346: * pending and we are issueing a non-FAF. If so, return an error
1.57 pooka 347: * directly UNLESS we are issueing INACTIVE/RECLAIM. In that case,
348: * convert it to a FAF, fire off to the file server and return
349: * an error. Yes, this is bordering disgusting. Barfbags are on me.
1.19 pooka 350: */
1.57 pooka 351: if (__predict_false((park->park_flags & PARKFLAG_WANTREPLY)
1.25 pooka 352: && (park->park_flags & PARKFLAG_CALL) == 0
1.57 pooka 353: && (l->l_flag & LW_PENDSIG) != 0 && sigispending(l, 0))) {
354: park->park_flags |= PARKFLAG_HASERROR;
355: preq->preq_rv = EINTR;
1.19 pooka 356: if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN
1.57 pooka 357: && (preq->preq_optype == PUFFS_VN_INACTIVE
358: || preq->preq_optype == PUFFS_VN_RECLAIM)) {
1.46 pooka 359: park->park_preq->preq_opclass |= PUFFSOPFLAG_FAF;
360: park->park_flags &= ~PARKFLAG_WANTREPLY;
1.57 pooka 361: DPRINTF(("puffs_msg_enqueue: converted to FAF %p\n",
362: park));
1.19 pooka 363: } else {
1.57 pooka 364: return;
1.19 pooka 365: }
366: }
1.16 pooka 367:
1.22 pooka 368: mutex_enter(&pmp->pmp_lock);
1.13 pooka 369: if (pmp->pmp_status != PUFFSTAT_RUNNING) {
1.22 pooka 370: mutex_exit(&pmp->pmp_lock);
1.57 pooka 371: park->park_flags |= PARKFLAG_HASERROR;
372: preq->preq_rv = ENXIO;
373: return;
1.1 pooka 374: }
375:
1.26 pooka 376: #ifdef PUFFSDEBUG
1.46 pooka 377: parkqdump(&pmp->pmp_msg_touser, puffsdebug > 1);
378: parkqdump(&pmp->pmp_msg_replywait, puffsdebug > 1);
1.26 pooka 379: #endif
380:
1.57 pooka 381: /*
382: * Note: we don't need to lock park since we have the only
383: * reference to it at this point.
384: */
1.46 pooka 385: TAILQ_INSERT_TAIL(&pmp->pmp_msg_touser, park, park_entries);
1.26 pooka 386: park->park_flags |= PARKFLAG_ONQUEUE1;
1.46 pooka 387: pmp->pmp_msg_touser_count++;
1.57 pooka 388: park->park_refcount++;
1.26 pooka 389: mutex_exit(&pmp->pmp_lock);
1.1 pooka 390:
1.57 pooka 391: cv_broadcast(&pmp->pmp_msg_waiter_cv);
392: putter_notify(pmp->pmp_pi);
393:
1.20 pooka 394: DPRINTF(("touser: req %" PRIu64 ", preq: %p, park: %p, "
1.25 pooka 395: "c/t: 0x%x/0x%x, f: 0x%x\n", preq->preq_id, preq, park,
396: preq->preq_opclass, preq->preq_optype, park->park_flags));
1.57 pooka 397: }
1.15 pooka 398:
1.57 pooka 399: int
400: puffs_msg_wait(struct puffs_mount *pmp, struct puffs_msgpark *park)
401: {
402: struct puffs_req *preq = park->park_preq; /* XXX: hmmm */
403: int error = 0;
404: int rv;
1.1 pooka 405:
1.57 pooka 406: mutex_enter(&pmp->pmp_lock);
407: puffs_mp_reference(pmp);
408: mutex_exit(&pmp->pmp_lock);
1.46 pooka 409:
1.57 pooka 410: mutex_enter(&park->park_mtx);
411: if ((park->park_flags & PARKFLAG_WANTREPLY) == 0
412: || (park->park_flags & PARKFLAG_CALL)) {
413: mutex_exit(&park->park_mtx);
414: rv = 0;
415: goto skipwait;
416: }
1.46 pooka 417:
1.57 pooka 418: /* did the response beat us to the wait? */
419: if (__predict_false((park->park_flags & PARKFLAG_DONE)
420: || (park->park_flags & PARKFLAG_HASERROR))) {
421: rv = park->park_preq->preq_rv;
422: mutex_exit(&park->park_mtx);
423: goto skipwait;
424: }
1.26 pooka 425:
1.57 pooka 426: error = cv_wait_sig(&park->park_cv, &park->park_mtx);
427: DPRINTF(("puffs_touser: waiter for %p woke up with %d\n",
428: park, error));
429: if (error) {
430: park->park_flags |= PARKFLAG_WAITERGONE;
431: if (park->park_flags & PARKFLAG_DONE) {
432: rv = preq->preq_rv;
433: mutex_exit(&park->park_mtx);
434: } else {
435: /*
436: * ok, we marked it as going away, but
437: * still need to do queue ops. take locks
438: * in correct order.
439: *
440: * We don't want to release our reference
441: * if it's on replywait queue to avoid error
442: * to file server. putop() code will DTRT.
443: */
444: mutex_exit(&park->park_mtx);
445: mutex_enter(&pmp->pmp_lock);
446: mutex_enter(&park->park_mtx);
447:
448: /*
449: * Still on queue1? We can safely remove it
450: * without any consequences since the file
451: * server hasn't seen it. "else" we need to
452: * wait for the response and just ignore it
453: * to avoid signalling an incorrect error to
454: * the file server.
455: */
456: if (park->park_flags & PARKFLAG_ONQUEUE1) {
457: TAILQ_REMOVE(&pmp->pmp_msg_touser,
458: park, park_entries);
459: puffs_msgpark_release(park);
460: pmp->pmp_msg_touser_count--;
461: park->park_flags &= ~PARKFLAG_ONQUEUE1;
462: } else {
463: mutex_exit(&park->park_mtx);
1.19 pooka 464: }
1.57 pooka 465: mutex_exit(&pmp->pmp_lock);
1.22 pooka 466:
1.60 pooka 467: rv = EINTR;
1.16 pooka 468: }
1.22 pooka 469: } else {
1.57 pooka 470: rv = preq->preq_rv;
471: mutex_exit(&park->park_mtx);
1.16 pooka 472: }
473:
1.57 pooka 474: skipwait:
1.22 pooka 475: mutex_enter(&pmp->pmp_lock);
1.34 pooka 476: puffs_mp_release(pmp);
1.22 pooka 477: mutex_exit(&pmp->pmp_lock);
1.16 pooka 478:
1.19 pooka 479: return rv;
1.1 pooka 480: }
481:
1.9 pooka 482: /*
1.57 pooka 483: * XXX: this suuuucks. Hopefully I'll get rid of this lossage once
484: * the whole setback-nonsense gets fixed.
485: */
486: int
487: puffs_msg_wait2(struct puffs_mount *pmp, struct puffs_msgpark *park,
488: struct puffs_node *pn1, struct puffs_node *pn2)
489: {
490: struct puffs_req *preq;
491: int rv;
492:
493: rv = puffs_msg_wait(pmp, park);
494:
495: preq = park->park_preq;
496: if (pn1 && preq->preq_setbacks & PUFFS_SETBACK_INACT_N1)
497: pn1->pn_stat |= PNODE_DOINACT;
498: if (pn2 && preq->preq_setbacks & PUFFS_SETBACK_INACT_N2)
499: pn2->pn_stat |= PNODE_DOINACT;
500:
501: if (pn1 && preq->preq_setbacks & PUFFS_SETBACK_NOREF_N1)
502: pn1->pn_stat |= PNODE_NOREFS;
503: if (pn2 && preq->preq_setbacks & PUFFS_SETBACK_NOREF_N2)
504: pn2->pn_stat |= PNODE_NOREFS;
505:
506: return rv;
507:
508: }
509:
510: /*
1.61 pooka 511: * XXX: lazy bum. please, for the love of foie gras, fix me.
512: * This should *NOT* depend on setfaf. Also "memcpy" could
513: * be done more nicely.
514: */
515: void
516: puffs_msg_sendresp(struct puffs_mount *pmp, struct puffs_req *origpreq, int rv)
517: {
518: struct puffs_msgpark *park;
519: struct puffs_req *preq;
520:
1.63 pooka 521: puffs_msgmem_alloc(sizeof(struct puffs_req), &park, (void *)&preq, 1);
1.61 pooka 522: puffs_msg_setfaf(park); /* XXXXXX: avoids reqid override */
523:
524: memcpy(preq, origpreq, sizeof(struct puffs_req));
525: preq->preq_rv = rv;
526: preq->preq_opclass |= PUFFSOPFLAG_ISRESPONSE;
527:
528: puffs_msg_enqueue(pmp, park);
529: puffs_msgmem_release(park);
530: }
531:
532: /*
1.46 pooka 533: * Get next request in the outgoing queue. "maxsize" controls the
534: * size the caller can accommodate and "nonblock" signals if this
535: * should block while waiting for input. Handles all locking internally.
1.9 pooka 536: */
1.10 pooka 537: int
1.46 pooka 538: puffs_msgif_getout(void *this, size_t maxsize, int nonblock,
539: uint8_t **data, size_t *dlen, void **parkptr)
1.1 pooka 540: {
1.46 pooka 541: struct puffs_mount *pmp = this;
542: struct puffs_msgpark *park;
1.9 pooka 543: struct puffs_req *preq;
1.46 pooka 544: int error;
1.1 pooka 545:
1.46 pooka 546: error = 0;
1.22 pooka 547: mutex_enter(&pmp->pmp_lock);
1.50 pooka 548: puffs_mp_reference(pmp);
1.46 pooka 549: for (;;) {
550: /* RIP? */
1.9 pooka 551: if (pmp->pmp_status != PUFFSTAT_RUNNING) {
552: error = ENXIO;
1.46 pooka 553: break;
1.9 pooka 554: }
1.12 pooka 555:
1.46 pooka 556: /* need platinum yendorian express card? */
557: if (TAILQ_EMPTY(&pmp->pmp_msg_touser)) {
558: DPRINTF(("puffs_getout: no outgoing op, "));
1.12 pooka 559: if (nonblock) {
1.46 pooka 560: DPRINTF(("returning EWOULDBLOCK\n"));
1.12 pooka 561: error = EWOULDBLOCK;
1.46 pooka 562: break;
1.9 pooka 563: }
1.46 pooka 564: DPRINTF(("waiting ...\n"));
1.9 pooka 565:
1.46 pooka 566: error = cv_wait_sig(&pmp->pmp_msg_waiter_cv,
1.22 pooka 567: &pmp->pmp_lock);
1.11 pooka 568: if (error)
1.46 pooka 569: break;
1.11 pooka 570: else
1.46 pooka 571: continue;
1.9 pooka 572: }
573:
1.46 pooka 574: park = TAILQ_FIRST(&pmp->pmp_msg_touser);
1.50 pooka 575: if (park == NULL)
576: continue;
577:
1.46 pooka 578: mutex_enter(&park->park_mtx);
579: puffs_msgpark_reference(park);
580:
581: DPRINTF(("puffs_getout: found park at %p, ", park));
1.22 pooka 582:
583: /* If it's a goner, don't process any furher */
584: if (park->park_flags & PARKFLAG_WAITERGONE) {
1.46 pooka 585: DPRINTF(("waitergone!\n"));
586: puffs_msgpark_release(park);
1.22 pooka 587: continue;
588: }
1.55 pooka 589: preq = park->park_preq;
1.22 pooka 590:
1.55 pooka 591: #if 0
1.46 pooka 592: /* check size */
1.55 pooka 593: /*
594: * XXX: this check is not valid for now, we don't know
595: * the size of the caller's input buffer. i.e. this
596: * will most likely go away
597: */
1.46 pooka 598: if (maxsize < preq->preq_frhdr.pfr_len) {
599: DPRINTF(("buffer too small\n"));
600: puffs_msgpark_release(park);
601: error = E2BIG;
602: break;
1.26 pooka 603: }
1.55 pooka 604: #endif
1.28 pooka 605:
1.46 pooka 606: DPRINTF(("returning\n"));
607:
608: /*
609: * Ok, we found what we came for. Release it from the
610: * outgoing queue but do not unlock. We will unlock
611: * only after we "releaseout" it to avoid complications:
612: * otherwise it is (theoretically) possible for userland
613: * to race us into "put" before we have a change to put
614: * this baby on the receiving queue.
615: */
616: TAILQ_REMOVE(&pmp->pmp_msg_touser, park, park_entries);
1.28 pooka 617: KASSERT(park->park_flags & PARKFLAG_ONQUEUE1);
618: park->park_flags &= ~PARKFLAG_ONQUEUE1;
1.46 pooka 619: mutex_exit(&park->park_mtx);
620:
621: pmp->pmp_msg_touser_count--;
622: KASSERT(pmp->pmp_msg_touser_count >= 0);
1.26 pooka 623:
1.46 pooka 624: break;
625: }
1.50 pooka 626: puffs_mp_release(pmp);
1.46 pooka 627: mutex_exit(&pmp->pmp_lock);
1.9 pooka 628:
1.46 pooka 629: if (error == 0) {
630: *data = (uint8_t *)preq;
1.55 pooka 631: preq->preq_pth.pth_framelen = park->park_copylen;
632: *dlen = preq->preq_pth.pth_framelen;
1.46 pooka 633: *parkptr = park;
634: }
1.51 pooka 635:
1.46 pooka 636: return error;
637: }
1.9 pooka 638:
1.46 pooka 639: /*
640: * Release outgoing structure. Now, depending on the success of the
641: * outgoing send, it is either going onto the result waiting queue
642: * or the death chamber.
643: */
644: void
645: puffs_msgif_releaseout(void *this, void *parkptr, int status)
646: {
647: struct puffs_mount *pmp = this;
648: struct puffs_msgpark *park = parkptr;
1.32 pooka 649:
1.46 pooka 650: DPRINTF(("puffs_releaseout: returning park %p, errno %d: " ,
651: park, status));
652: mutex_enter(&pmp->pmp_lock);
653: mutex_enter(&park->park_mtx);
654: if (park->park_flags & PARKFLAG_WANTREPLY) {
655: if (status == 0) {
656: DPRINTF(("enqueue replywait\n"));
657: TAILQ_INSERT_TAIL(&pmp->pmp_msg_replywait, park,
1.22 pooka 658: park_entries);
1.26 pooka 659: park->park_flags |= PARKFLAG_ONQUEUE2;
1.9 pooka 660: } else {
1.46 pooka 661: DPRINTF(("error path!\n"));
662: park->park_preq->preq_rv = status;
663: park->park_flags |= PARKFLAG_DONE;
664: cv_signal(&park->park_cv);
1.1 pooka 665: }
1.46 pooka 666: puffs_msgpark_release(park);
667: } else {
668: DPRINTF(("release\n"));
669: puffs_msgpark_release1(park, 2);
1.1 pooka 670: }
1.22 pooka 671: mutex_exit(&pmp->pmp_lock);
1.1 pooka 672: }
673:
1.53 pooka 674: size_t
675: puffs_msgif_waitcount(void *this)
676: {
677: struct puffs_mount *pmp = this;
678: size_t rv;
679:
680: mutex_enter(&pmp->pmp_lock);
681: rv = pmp->pmp_msg_touser_count;
682: mutex_exit(&pmp->pmp_lock);
683:
684: return rv;
685: }
686:
1.50 pooka 687: /*
688: * XXX: locking with this one?
689: */
1.53 pooka 690: static void
1.56 pooka 691: puffsop_msg(void *this, struct puffs_req *preq)
1.1 pooka 692: {
1.46 pooka 693: struct puffs_mount *pmp = this;
1.55 pooka 694: struct putter_hdr *pth = &preq->preq_pth;
1.46 pooka 695: struct puffs_msgpark *park;
1.57 pooka 696: int wgone;
1.1 pooka 697:
1.22 pooka 698: mutex_enter(&pmp->pmp_lock);
1.9 pooka 699:
1.46 pooka 700: /* Locate waiter */
701: TAILQ_FOREACH(park, &pmp->pmp_msg_replywait, park_entries) {
702: if (park->park_preq->preq_id == preq->preq_id)
1.1 pooka 703: break;
1.46 pooka 704: }
705: if (park == NULL) {
1.58 pooka 706: DPRINTF(("puffsop_msg: no request: %" PRIu64 "\n",
1.46 pooka 707: preq->preq_id));
708: mutex_exit(&pmp->pmp_lock);
709: return; /* XXX send error */
710: }
1.26 pooka 711:
1.46 pooka 712: mutex_enter(&park->park_mtx);
713: puffs_msgpark_reference(park);
1.55 pooka 714: if (pth->pth_framelen > park->park_maxlen) {
1.58 pooka 715: DPRINTF(("puffsop_msg: invalid buffer length: "
1.55 pooka 716: "%" PRIu64 " (req %" PRIu64 ", \n", pth->pth_framelen,
717: preq->preq_id));
1.46 pooka 718: park->park_preq->preq_rv = EPROTO;
719: cv_signal(&park->park_cv);
1.57 pooka 720: puffs_msgpark_release1(park, 2);
1.22 pooka 721: mutex_exit(&pmp->pmp_lock);
1.46 pooka 722: return; /* XXX: error */
723: }
724: wgone = park->park_flags & PARKFLAG_WAITERGONE;
1.9 pooka 725:
1.46 pooka 726: KASSERT(park->park_flags & PARKFLAG_ONQUEUE2);
727: TAILQ_REMOVE(&pmp->pmp_msg_replywait, park, park_entries);
728: park->park_flags &= ~PARKFLAG_ONQUEUE2;
729: mutex_exit(&pmp->pmp_lock);
1.24 pooka 730:
1.46 pooka 731: if (wgone) {
1.58 pooka 732: DPRINTF(("puffsop_msg: bad service - waiter gone for "
1.46 pooka 733: "park %p\n", park));
734: } else {
1.24 pooka 735: if (park->park_flags & PARKFLAG_CALL) {
1.58 pooka 736: DPRINTF(("puffsop_msg: call for %p, arg %p\n",
1.40 pooka 737: park->park_preq, park->park_donearg));
1.55 pooka 738: park->park_done(pmp, preq, park->park_donearg);
1.46 pooka 739: } else {
740: /* XXX: yes, I know */
1.55 pooka 741: memcpy(park->park_preq, preq, pth->pth_framelen);
1.20 pooka 742: }
1.46 pooka 743: }
1.1 pooka 744:
1.46 pooka 745: if (!wgone) {
746: DPRINTF(("puffs_putop: flagging done for "
747: "park %p\n", park));
748: cv_signal(&park->park_cv);
1.1 pooka 749: }
750:
1.46 pooka 751: park->park_flags |= PARKFLAG_DONE;
1.57 pooka 752: puffs_msgpark_release1(park, 2);
1.1 pooka 753: }
754:
1.61 pooka 755: static void
1.53 pooka 756: puffsop_flush(struct puffs_mount *pmp, struct puffs_flush *pf)
757: {
758: struct vnode *vp;
759: voff_t offlo, offhi;
760: int rv, flags = 0;
761:
1.61 pooka 762: if (pf->pf_req.preq_pth.pth_framelen != sizeof(struct puffs_flush)) {
763: rv = EINVAL;
764: goto out;
765: }
766:
1.53 pooka 767: /* XXX: slurry */
768: if (pf->pf_op == PUFFS_INVAL_NAMECACHE_ALL) {
769: cache_purgevfs(PMPTOMP(pmp));
1.61 pooka 770: rv = 0;
771: goto out;
1.53 pooka 772: }
773:
774: /*
775: * Get vnode, don't lock it. Namecache is protected by its own lock
776: * and we have a reference to protect against premature harvesting.
777: *
778: * The node we want here might be locked and the op is in
779: * userspace waiting for us to complete ==> deadlock. Another
780: * reason we need to eventually bump locking to userspace, as we
781: * will need to lock the node if we wish to do flushes.
782: */
783: rv = puffs_cookie2vnode(pmp, pf->pf_cookie, 0, 0, &vp);
784: if (rv) {
785: if (rv == PUFFS_NOSUCHCOOKIE)
1.61 pooka 786: rv = ENOENT;
787: goto out;
1.53 pooka 788: }
789:
790: switch (pf->pf_op) {
791: #if 0
792: /* not quite ready, yet */
793: case PUFFS_INVAL_NAMECACHE_NODE:
794: struct componentname *pf_cn;
795: char *name;
796: /* get comfortab^Wcomponentname */
1.59 pooka 797: pf_cn = kmem_alloc(componentname);
1.53 pooka 798: memset(pf_cn, 0, sizeof(struct componentname));
799: break;
800:
801: #endif
802: case PUFFS_INVAL_NAMECACHE_DIR:
803: if (vp->v_type != VDIR) {
804: rv = EINVAL;
805: break;
806: }
807: cache_purge1(vp, NULL, PURGE_CHILDREN);
808: break;
809:
810: case PUFFS_INVAL_PAGECACHE_NODE_RANGE:
811: flags = PGO_FREE;
812: /*FALLTHROUGH*/
813: case PUFFS_FLUSH_PAGECACHE_NODE_RANGE:
814: if (flags == 0)
815: flags = PGO_CLEANIT;
816:
817: if (pf->pf_end > vp->v_size || vp->v_type != VREG) {
818: rv = EINVAL;
819: break;
820: }
821:
822: offlo = trunc_page(pf->pf_start);
823: offhi = round_page(pf->pf_end);
824: if (offhi != 0 && offlo >= offhi) {
825: rv = EINVAL;
826: break;
827: }
828:
1.62 ad 829: mutex_enter(&vp->v_uobj.vmobjlock);
1.53 pooka 830: rv = VOP_PUTPAGES(vp, offlo, offhi, flags);
831: break;
832:
833: default:
834: rv = EINVAL;
835: }
836:
837: vrele(vp);
838:
1.61 pooka 839: out:
840: puffs_msg_sendresp(pmp, &pf->pf_req, rv);
1.53 pooka 841: }
842:
843: int
1.56 pooka 844: puffs_msgif_dispatch(void *this, struct putter_hdr *pth)
1.53 pooka 845: {
846: struct puffs_mount *pmp = this;
1.56 pooka 847: struct puffs_req *preq = (struct puffs_req *)pth;
1.74 pooka 848: int rv = 0;
1.56 pooka 849:
850: /* XXX: need to send error to userspace */
1.61 pooka 851: if (pth->pth_framelen < sizeof(struct puffs_req)) {
852: puffs_msg_sendresp(pmp, preq, EINVAL); /* E2SMALL */
853: return 0;
854: }
1.53 pooka 855:
1.55 pooka 856: switch (PUFFSOP_OPCLASS(preq->preq_opclass)) {
1.53 pooka 857: case PUFFSOP_VN:
858: case PUFFSOP_VFS:
1.61 pooka 859: DPRINTF(("dispatch: vn/vfs message 0x%x\n", preq->preq_optype));
1.56 pooka 860: puffsop_msg(pmp, preq);
1.53 pooka 861: break;
862: case PUFFSOP_FLUSH:
1.61 pooka 863: DPRINTF(("dispatch: flush 0x%x\n", preq->preq_optype));
1.56 pooka 864: puffsop_flush(pmp, (struct puffs_flush *)preq);
1.53 pooka 865: break;
866: default:
1.61 pooka 867: DPRINTF(("dispatch: invalid class 0x%x\n", preq->preq_opclass));
1.75 ! pooka 868: puffs_msg_sendresp(pmp, preq, EOPNOTSUPP);
1.53 pooka 869: break;
870: }
871:
1.74 pooka 872: return rv;
1.53 pooka 873: }
874:
875: int
876: puffs_msgif_close(void *this)
877: {
878: struct puffs_mount *pmp = this;
879: struct mount *mp = PMPTOMP(pmp);
880:
881: mutex_enter(&pmp->pmp_lock);
882: puffs_mp_reference(pmp);
883:
884: /*
885: * Free the waiting callers before proceeding any further.
886: * The syncer might be jogging around in this file system
887: * currently. If we allow it to go to the userspace of no
888: * return while trying to get the syncer lock, well ...
889: */
890: puffs_userdead(pmp);
891:
892: /*
893: * Make sure someone from puffs_unmount() isn't currently in
894: * userspace. If we don't take this precautionary step,
895: * they might notice that the mountpoint has disappeared
896: * from under them once they return. Especially note that we
897: * cannot simply test for an unmounter before calling
898: * dounmount(), since it might be possible that that particular
899: * invocation of unmount was called without MNT_FORCE. Here we
900: * *must* make sure unmount succeeds. Also, restart is necessary
901: * since pmp isn't locked. We might end up with PUTTER_DEAD after
902: * restart and exit from there.
903: */
904: if (pmp->pmp_unmounting) {
905: cv_wait(&pmp->pmp_unmounting_cv, &pmp->pmp_lock);
906: puffs_mp_release(pmp);
907: mutex_exit(&pmp->pmp_lock);
908: DPRINTF(("puffs_fop_close: unmount was in progress for pmp %p, "
909: "restart\n", pmp));
910: return ERESTART;
911: }
912:
913: /* Won't access pmp from here anymore */
1.72 ad 914: atomic_inc_uint((unsigned int*)&mp->mnt_refcnt);
1.53 pooka 915: puffs_mp_release(pmp);
916: mutex_exit(&pmp->pmp_lock);
917:
1.72 ad 918: /* Detach from VFS. */
1.71 ad 919: (void)dounmount(mp, MNT_FORCE, curlwp);
1.72 ad 920: vfs_destroy(mp);
1.53 pooka 921:
922: return 0;
923: }
924:
925: /*
1.22 pooka 926: * We're dead, kaput, RIP, slightly more than merely pining for the
927: * fjords, belly-up, fallen, lifeless, finished, expired, gone to meet
928: * our maker, ceased to be, etcetc. YASD. It's a dead FS!
929: *
930: * Caller must hold puffs mutex.
931: */
932: void
933: puffs_userdead(struct puffs_mount *pmp)
934: {
1.46 pooka 935: struct puffs_msgpark *park, *park_next;
1.22 pooka 936:
937: /*
938: * Mark filesystem status as dying so that operations don't
939: * attempt to march to userspace any longer.
940: */
941: pmp->pmp_status = PUFFSTAT_DYING;
942:
943: /* signal waiters on REQUEST TO file server queue */
1.46 pooka 944: for (park = TAILQ_FIRST(&pmp->pmp_msg_touser); park; park = park_next) {
1.24 pooka 945: uint8_t opclass;
946:
1.46 pooka 947: mutex_enter(&park->park_mtx);
948: puffs_msgpark_reference(park);
1.32 pooka 949: park_next = TAILQ_NEXT(park, park_entries);
1.26 pooka 950:
951: KASSERT(park->park_flags & PARKFLAG_ONQUEUE1);
1.46 pooka 952: TAILQ_REMOVE(&pmp->pmp_msg_touser, park, park_entries);
1.26 pooka 953: park->park_flags &= ~PARKFLAG_ONQUEUE1;
1.46 pooka 954: pmp->pmp_msg_touser_count--;
1.22 pooka 955:
1.31 pooka 956: /*
1.51 pooka 957: * Even though waiters on QUEUE1 are removed in touser()
958: * in case of WAITERGONE, it is still possible for us to
959: * get raced here due to having to retake locks in said
960: * touser(). In the race case simply "ignore" the item
961: * on the queue and move on to the next one.
1.31 pooka 962: */
963: if (park->park_flags & PARKFLAG_WAITERGONE) {
964: KASSERT((park->park_flags & PARKFLAG_CALL) == 0);
965: KASSERT(park->park_flags & PARKFLAG_WANTREPLY);
1.46 pooka 966: puffs_msgpark_release(park);
1.51 pooka 967:
1.22 pooka 968: } else {
1.31 pooka 969: opclass = park->park_preq->preq_opclass;
1.23 pooka 970: park->park_preq->preq_rv = ENXIO;
1.31 pooka 971:
972: if (park->park_flags & PARKFLAG_CALL) {
1.42 pooka 973: park->park_done(pmp, park->park_preq,
1.31 pooka 974: park->park_donearg);
1.46 pooka 975: puffs_msgpark_release1(park, 2);
1.31 pooka 976: } else if ((park->park_flags & PARKFLAG_WANTREPLY)==0) {
1.46 pooka 977: puffs_msgpark_release1(park, 2);
1.31 pooka 978: } else {
979: park->park_preq->preq_rv = ENXIO;
980: cv_signal(&park->park_cv);
1.46 pooka 981: puffs_msgpark_release(park);
1.31 pooka 982: }
1.22 pooka 983: }
984: }
985:
986: /* signal waiters on RESPONSE FROM file server queue */
1.46 pooka 987: for (park=TAILQ_FIRST(&pmp->pmp_msg_replywait); park; park=park_next) {
988: mutex_enter(&park->park_mtx);
989: puffs_msgpark_reference(park);
1.32 pooka 990: park_next = TAILQ_NEXT(park, park_entries);
1.26 pooka 991:
992: KASSERT(park->park_flags & PARKFLAG_ONQUEUE2);
1.31 pooka 993: KASSERT(park->park_flags & PARKFLAG_WANTREPLY);
1.26 pooka 994:
1.46 pooka 995: TAILQ_REMOVE(&pmp->pmp_msg_replywait, park, park_entries);
1.26 pooka 996: park->park_flags &= ~PARKFLAG_ONQUEUE2;
997:
1.31 pooka 998: if (park->park_flags & PARKFLAG_WAITERGONE) {
999: KASSERT((park->park_flags & PARKFLAG_CALL) == 0);
1.46 pooka 1000: puffs_msgpark_release(park);
1.22 pooka 1001: } else {
1.31 pooka 1002: park->park_preq->preq_rv = ENXIO;
1003: if (park->park_flags & PARKFLAG_CALL) {
1.42 pooka 1004: park->park_done(pmp, park->park_preq,
1.31 pooka 1005: park->park_donearg);
1.46 pooka 1006: puffs_msgpark_release1(park, 2);
1.31 pooka 1007: } else {
1008: cv_signal(&park->park_cv);
1.46 pooka 1009: puffs_msgpark_release(park);
1.31 pooka 1010: }
1.22 pooka 1011: }
1012: }
1.50 pooka 1013:
1014: cv_broadcast(&pmp->pmp_msg_waiter_cv);
1.22 pooka 1015: }
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