puffs.c revision 1.119
1 /* $NetBSD: puffs.c,v 1.119 2014/12/22 08:16:21 manu 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 #if !defined(lint) 34 __RCSID("$NetBSD: puffs.c,v 1.119 2014/12/22 08:16:21 manu Exp $"); 35 #endif /* !lint */ 36 37 #include <sys/param.h> 38 #include <sys/mount.h> 39 40 #include <assert.h> 41 #include <err.h> 42 #include <errno.h> 43 #include <fcntl.h> 44 #include <mntopts.h> 45 #include <paths.h> 46 #include <pthread.h> 47 #include <puffs.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <syslog.h> 52 #include <unistd.h> 53 54 #include "puffs_priv.h" 55 56 /* Most file systems want this for opts, so just give it to them */ 57 const struct mntopt puffsmopts[] = { 58 MOPT_STDOPTS, 59 PUFFSMOPT_STD, 60 MOPT_NULL, 61 }; 62 63 pthread_mutex_t pu_lock = PTHREAD_MUTEX_INITIALIZER; 64 65 #define FILLOP(lower, upper) \ 66 do { \ 67 if (pops->puffs_node_##lower) \ 68 opmask[PUFFS_VN_##upper] = 1; \ 69 } while (/*CONSTCOND*/0) 70 static void 71 fillvnopmask(struct puffs_ops *pops, struct puffs_kargs *pa) 72 { 73 uint8_t *opmask = pa->pa_vnopmask; 74 75 memset(opmask, 0, sizeof(pa->pa_vnopmask)); 76 77 FILLOP(create, CREATE); 78 FILLOP(mknod, MKNOD); 79 FILLOP(open, OPEN); 80 FILLOP(close, CLOSE); 81 FILLOP(access, ACCESS); 82 FILLOP(getattr, GETATTR); 83 FILLOP(setattr, SETATTR); 84 FILLOP(poll, POLL); 85 FILLOP(mmap, MMAP); 86 FILLOP(fsync, FSYNC); 87 FILLOP(seek, SEEK); 88 FILLOP(remove, REMOVE); 89 FILLOP(link, LINK); 90 FILLOP(rename, RENAME); 91 FILLOP(mkdir, MKDIR); 92 FILLOP(rmdir, RMDIR); 93 FILLOP(symlink, SYMLINK); 94 FILLOP(readdir, READDIR); 95 FILLOP(readlink, READLINK); 96 FILLOP(reclaim, RECLAIM); 97 FILLOP(inactive, INACTIVE); 98 FILLOP(print, PRINT); 99 FILLOP(read, READ); 100 FILLOP(write, WRITE); 101 FILLOP(advlock, ADVLOCK); 102 FILLOP(abortop, ABORTOP); 103 FILLOP(pathconf, PATHCONF); 104 105 FILLOP(getextattr, GETEXTATTR); 106 FILLOP(setextattr, SETEXTATTR); 107 FILLOP(listextattr, LISTEXTATTR); 108 FILLOP(deleteextattr, DELETEEXTATTR); 109 FILLOP(fallocate, FALLOCATE); 110 FILLOP(fdiscard, FDISCARD); 111 } 112 #undef FILLOP 113 114 /* 115 * Go over all framev entries and write everything we can. This is 116 * mostly for the benefit of delivering "unmount" to the kernel. 117 */ 118 static void 119 finalpush(struct puffs_usermount *pu) 120 { 121 struct puffs_fctrl_io *fio; 122 123 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 124 if (fio->stat & FIO_WRGONE) 125 continue; 126 127 puffs__framev_output(pu, fio->fctrl, fio); 128 } 129 } 130 131 /*ARGSUSED*/ 132 void 133 puffs_kernerr_abort(struct puffs_usermount *pu, uint8_t type, 134 int error, const char *str, puffs_cookie_t cookie) 135 { 136 137 fprintf(stderr, "abort: type %d, error %d, cookie %p (%s)\n", 138 type, error, cookie, str); 139 abort(); 140 } 141 142 /*ARGSUSED*/ 143 void 144 puffs_kernerr_log(struct puffs_usermount *pu, uint8_t type, 145 int error, const char *str, puffs_cookie_t cookie) 146 { 147 148 syslog(LOG_WARNING, "kernel: type %d, error %d, cookie %p (%s)\n", 149 type, error, cookie, str); 150 } 151 152 int 153 puffs_getselectable(struct puffs_usermount *pu) 154 { 155 156 return pu->pu_fd; 157 } 158 159 uint64_t 160 puffs__nextreq(struct puffs_usermount *pu) 161 { 162 uint64_t rv; 163 164 PU_LOCK(); 165 rv = pu->pu_nextreq++ | (uint64_t)1<<63; 166 PU_UNLOCK(); 167 168 return rv; 169 } 170 171 int 172 puffs_setblockingmode(struct puffs_usermount *pu, int mode) 173 { 174 int rv, x; 175 176 assert(puffs_getstate(pu) == PUFFS_STATE_RUNNING); 177 178 if (mode != PUFFSDEV_BLOCK && mode != PUFFSDEV_NONBLOCK) { 179 errno = EINVAL; 180 return -1; 181 } 182 183 x = mode; 184 rv = ioctl(pu->pu_fd, FIONBIO, &x); 185 186 if (rv == 0) { 187 if (mode == PUFFSDEV_BLOCK) 188 pu->pu_state &= ~PU_ASYNCFD; 189 else 190 pu->pu_state |= PU_ASYNCFD; 191 } 192 193 return rv; 194 } 195 196 int 197 puffs_getstate(struct puffs_usermount *pu) 198 { 199 200 return pu->pu_state & PU_STATEMASK; 201 } 202 203 void 204 puffs_setstacksize(struct puffs_usermount *pu, size_t ss) 205 { 206 long psize, minsize; 207 int stackshift; 208 int bonus; 209 210 assert(puffs_getstate(pu) == PUFFS_STATE_BEFOREMOUNT); 211 212 psize = sysconf(_SC_PAGESIZE); 213 minsize = 4*psize; 214 if (ss < (size_t)minsize || ss == PUFFS_STACKSIZE_MIN) { 215 if (ss != PUFFS_STACKSIZE_MIN) 216 fprintf(stderr, "puffs_setstacksize: adjusting " 217 "stacksize to minimum %ld\n", minsize); 218 ss = 4*psize; 219 } 220 221 stackshift = -1; 222 bonus = 0; 223 while (ss) { 224 if (ss & 0x1) 225 bonus++; 226 ss >>= 1; 227 stackshift++; 228 } 229 if (bonus > 1) { 230 stackshift++; 231 fprintf(stderr, "puffs_setstacksize: using next power of two: " 232 "%d\n", 1<<stackshift); 233 } 234 235 pu->pu_cc_stackshift = stackshift; 236 } 237 238 struct puffs_pathobj * 239 puffs_getrootpathobj(struct puffs_usermount *pu) 240 { 241 struct puffs_node *pnr; 242 243 pnr = pu->pu_pn_root; 244 if (pnr == NULL) { 245 errno = ENOENT; 246 return NULL; 247 } 248 249 return &pnr->pn_po; 250 } 251 252 void 253 puffs_setroot(struct puffs_usermount *pu, struct puffs_node *pn) 254 { 255 256 pu->pu_pn_root = pn; 257 } 258 259 struct puffs_node * 260 puffs_getroot(struct puffs_usermount *pu) 261 { 262 263 return pu->pu_pn_root; 264 } 265 266 void 267 puffs_setrootinfo(struct puffs_usermount *pu, enum vtype vt, 268 vsize_t vsize, dev_t rdev) 269 { 270 struct puffs_kargs *pargs = pu->pu_kargp; 271 272 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) { 273 warnx("puffs_setrootinfo: call has effect only " 274 "before mount\n"); 275 return; 276 } 277 278 pargs->pa_root_vtype = vt; 279 pargs->pa_root_vsize = vsize; 280 pargs->pa_root_rdev = rdev; 281 } 282 283 void * 284 puffs_getspecific(struct puffs_usermount *pu) 285 { 286 287 return pu->pu_privdata; 288 } 289 290 void 291 puffs_setspecific(struct puffs_usermount *pu, void *privdata) 292 { 293 294 pu->pu_privdata = privdata; 295 } 296 297 void 298 puffs_setmntinfo(struct puffs_usermount *pu, 299 const char *mntfromname, const char *puffsname) 300 { 301 struct puffs_kargs *pargs = pu->pu_kargp; 302 303 (void)strlcpy(pargs->pa_mntfromname, mntfromname, 304 sizeof(pargs->pa_mntfromname)); 305 (void)strlcpy(pargs->pa_typename, puffsname, 306 sizeof(pargs->pa_typename)); 307 } 308 309 size_t 310 puffs_getmaxreqlen(struct puffs_usermount *pu) 311 { 312 313 return pu->pu_maxreqlen; 314 } 315 316 void 317 puffs_setmaxreqlen(struct puffs_usermount *pu, size_t reqlen) 318 { 319 320 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) 321 warnx("puffs_setmaxreqlen: call has effect only " 322 "before mount\n"); 323 324 pu->pu_kargp->pa_maxmsglen = reqlen; 325 } 326 327 void 328 puffs_setfhsize(struct puffs_usermount *pu, size_t fhsize, int flags) 329 { 330 331 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) 332 warnx("puffs_setfhsize: call has effect only before mount\n"); 333 334 pu->pu_kargp->pa_fhsize = fhsize; 335 pu->pu_kargp->pa_fhflags = flags; 336 } 337 338 void 339 puffs_setncookiehash(struct puffs_usermount *pu, int nhash) 340 { 341 342 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) 343 warnx("puffs_setfhsize: call has effect only before mount\n"); 344 345 pu->pu_kargp->pa_nhashbuckets = nhash; 346 } 347 348 void 349 puffs_set_pathbuild(struct puffs_usermount *pu, pu_pathbuild_fn fn) 350 { 351 352 pu->pu_pathbuild = fn; 353 } 354 355 void 356 puffs_set_pathtransform(struct puffs_usermount *pu, pu_pathtransform_fn fn) 357 { 358 359 pu->pu_pathtransform = fn; 360 } 361 362 void 363 puffs_set_pathcmp(struct puffs_usermount *pu, pu_pathcmp_fn fn) 364 { 365 366 pu->pu_pathcmp = fn; 367 } 368 369 void 370 puffs_set_pathfree(struct puffs_usermount *pu, pu_pathfree_fn fn) 371 { 372 373 pu->pu_pathfree = fn; 374 } 375 376 void 377 puffs_set_namemod(struct puffs_usermount *pu, pu_namemod_fn fn) 378 { 379 380 pu->pu_namemod = fn; 381 } 382 383 void 384 puffs_set_errnotify(struct puffs_usermount *pu, pu_errnotify_fn fn) 385 { 386 387 pu->pu_errnotify = fn; 388 } 389 390 void 391 puffs_set_cmap(struct puffs_usermount *pu, pu_cmap_fn fn) 392 { 393 394 pu->pu_cmap = fn; 395 } 396 397 void 398 puffs_ml_setloopfn(struct puffs_usermount *pu, puffs_ml_loop_fn lfn) 399 { 400 401 pu->pu_ml_lfn = lfn; 402 } 403 404 void 405 puffs_ml_settimeout(struct puffs_usermount *pu, struct timespec *ts) 406 { 407 408 if (ts == NULL) { 409 pu->pu_ml_timep = NULL; 410 } else { 411 pu->pu_ml_timeout = *ts; 412 pu->pu_ml_timep = &pu->pu_ml_timeout; 413 } 414 } 415 416 void 417 puffs_set_prepost(struct puffs_usermount *pu, 418 pu_prepost_fn pre, pu_prepost_fn pst) 419 { 420 421 pu->pu_oppre = pre; 422 pu->pu_oppost = pst; 423 } 424 425 void 426 puffs_setback(struct puffs_cc *pcc, int whatback) 427 { 428 struct puffs_req *preq = puffs__framebuf_getdataptr(pcc->pcc_pb); 429 430 assert(PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN && ( 431 preq->preq_optype == PUFFS_VN_OPEN || 432 preq->preq_optype == PUFFS_VN_MMAP || 433 preq->preq_optype == PUFFS_VN_REMOVE || 434 preq->preq_optype == PUFFS_VN_RMDIR || 435 preq->preq_optype == PUFFS_VN_INACTIVE)); 436 437 preq->preq_setbacks |= whatback & PUFFS_SETBACK_MASK; 438 } 439 440 int 441 puffs_daemon(struct puffs_usermount *pu, int nochdir, int noclose) 442 { 443 long int n; 444 int parent, value, fd; 445 446 if (pipe(pu->pu_dpipe) == -1) 447 return -1; 448 449 switch (fork()) { 450 case -1: 451 return -1; 452 case 0: 453 parent = 0; 454 break; 455 default: 456 parent = 1; 457 break; 458 } 459 pu->pu_state |= PU_PUFFSDAEMON; 460 461 if (parent) { 462 close(pu->pu_dpipe[1]); 463 n = read(pu->pu_dpipe[0], &value, sizeof(int)); 464 if (n == -1) 465 err(1, "puffs_daemon"); 466 if (n != sizeof(value)) 467 errx(1, "puffs_daemon got %ld bytes", n); 468 if (value) { 469 errno = value; 470 err(1, "puffs_daemon"); 471 } 472 exit(0); 473 } else { 474 if (setsid() == -1) 475 goto fail; 476 477 if (!nochdir) 478 chdir("/"); 479 480 if (!noclose) { 481 fd = open(_PATH_DEVNULL, O_RDWR, 0); 482 if (fd == -1) 483 goto fail; 484 dup2(fd, STDIN_FILENO); 485 dup2(fd, STDOUT_FILENO); 486 dup2(fd, STDERR_FILENO); 487 if (fd > STDERR_FILENO) 488 close(fd); 489 } 490 return 0; 491 } 492 493 fail: 494 n = write(pu->pu_dpipe[1], &errno, sizeof(int)); 495 assert(n == 4); 496 return -1; 497 } 498 499 static void 500 shutdaemon(struct puffs_usermount *pu, int error) 501 { 502 ssize_t n; 503 504 n = write(pu->pu_dpipe[1], &error, sizeof(int)); 505 assert(n == 4); 506 close(pu->pu_dpipe[0]); 507 close(pu->pu_dpipe[1]); 508 pu->pu_state &= ~PU_PUFFSDAEMON; 509 } 510 511 int 512 puffs_mount(struct puffs_usermount *pu, const char *dir, int mntflags, 513 puffs_cookie_t cookie) 514 { 515 int rv, fd, sverrno; 516 char *comfd; 517 518 pu->pu_kargp->pa_root_cookie = cookie; 519 520 /* XXXkludgehere */ 521 /* kauth doesn't provide this service any longer */ 522 if (geteuid() != 0) 523 mntflags |= MNT_NOSUID | MNT_NODEV; 524 525 /* 526 * Undocumented... Well, documented only here. 527 * 528 * This is used for imaginative purposes. If the env variable is 529 * set, puffs_mount() doesn't do the regular mount procedure. 530 * Rather, it crams the mount data down the comfd and sets comfd as 531 * the puffs descriptor. 532 * 533 * This shouldn't be used unless you can read my mind ( ... or write 534 * it, not to mention execute it, but that's starting to get silly). 535 */ 536 if ((comfd = getenv("PUFFS_COMFD")) != NULL) { 537 size_t len; 538 539 if (sscanf(comfd, "%d", &pu->pu_fd) != 1) { 540 errno = EINVAL; 541 rv = -1; 542 goto out; 543 } 544 /* check that what we got at least resembles an fd */ 545 if (fcntl(pu->pu_fd, F_GETFL) == -1) { 546 rv = -1; 547 goto out; 548 } 549 550 #define allwrite(buf, len) \ 551 do { \ 552 ssize_t al_rv; \ 553 al_rv = write(pu->pu_fd, buf, len); \ 554 if ((size_t)al_rv != len) { \ 555 if (al_rv != -1) \ 556 errno = EIO; \ 557 rv = -1; \ 558 goto out; \ 559 } \ 560 } while (/*CONSTCOND*/0) 561 len = strlen(dir)+1; 562 allwrite(&len, sizeof(len)); 563 allwrite(dir, len); 564 len = strlen(pu->pu_kargp->pa_mntfromname)+1; 565 allwrite(&len, sizeof(len)); 566 allwrite(pu->pu_kargp->pa_mntfromname, len); 567 allwrite(&mntflags, sizeof(mntflags)); 568 len = sizeof(*pu->pu_kargp); 569 allwrite(&len, sizeof(len)); 570 allwrite(pu->pu_kargp, sizeof(*pu->pu_kargp)); 571 allwrite(&pu->pu_flags, sizeof(pu->pu_flags)); 572 #undef allwrite 573 574 rv = 0; 575 } else { 576 char rp[MAXPATHLEN]; 577 size_t rplen,dirlen; 578 579 if (realpath(dir, rp) == NULL) { 580 rv = -1; 581 goto out; 582 } 583 584 rplen = strlen(rp); 585 dirlen = strlen(dir); 586 if (strncmp(dir, rp, rplen) != 0 || 587 strspn(dir + rplen, "/") != dirlen - rplen) { 588 warnx("puffs_mount: \"%s\" is a relative path.", dir); 589 warnx("puffs_mount: using \"%s\" instead.", rp); 590 } 591 592 fd = open(_PATH_PUFFS, O_RDWR); 593 if (fd == -1) { 594 warnx("puffs_mount: cannot open %s", _PATH_PUFFS); 595 rv = -1; 596 goto out; 597 } 598 if (fd <= 2) 599 warnx("puffs_mount: device fd %d (<= 2), sure this is " 600 "what you want?", fd); 601 602 pu->pu_kargp->pa_fd = pu->pu_fd = fd; 603 if ((rv = mount(MOUNT_PUFFS, rp, mntflags, 604 pu->pu_kargp, sizeof(struct puffs_kargs))) == -1) 605 goto out; 606 } 607 608 PU_SETSTATE(pu, PUFFS_STATE_RUNNING); 609 610 out: 611 if (rv != 0) 612 sverrno = errno; 613 else 614 sverrno = 0; 615 free(pu->pu_kargp); 616 pu->pu_kargp = NULL; 617 618 if (pu->pu_state & PU_PUFFSDAEMON) 619 shutdaemon(pu, sverrno); 620 621 errno = sverrno; 622 return rv; 623 } 624 625 struct puffs_usermount * 626 puffs_init(struct puffs_ops *pops, const char *mntfromname, 627 const char *puffsname, void *priv, uint32_t pflags) 628 { 629 struct puffs_usermount *pu; 630 struct puffs_kargs *pargs; 631 int sverrno; 632 633 if (puffsname == PUFFS_DEFER) 634 puffsname = "n/a"; 635 if (mntfromname == PUFFS_DEFER) 636 mntfromname = "n/a"; 637 if (priv == PUFFS_DEFER) 638 priv = NULL; 639 640 pu = malloc(sizeof(struct puffs_usermount)); 641 if (pu == NULL) 642 goto failfree; 643 memset(pu, 0, sizeof(struct puffs_usermount)); 644 645 pargs = pu->pu_kargp = malloc(sizeof(struct puffs_kargs)); 646 if (pargs == NULL) 647 goto failfree; 648 memset(pargs, 0, sizeof(struct puffs_kargs)); 649 650 pargs->pa_vers = PUFFSVERSION; 651 pargs->pa_flags = PUFFS_FLAG_KERN(pflags); 652 fillvnopmask(pops, pargs); 653 puffs_setmntinfo(pu, mntfromname, puffsname); 654 655 puffs_zerostatvfs(&pargs->pa_svfsb); 656 pargs->pa_root_cookie = NULL; 657 pargs->pa_root_vtype = VDIR; 658 pargs->pa_root_vsize = 0; 659 pargs->pa_root_rdev = 0; 660 pargs->pa_maxmsglen = 0; 661 if (/*CONSTCOND*/ sizeof(time_t) == 4) 662 pargs->pa_time32 = 1; 663 else 664 pargs->pa_time32 = 0; 665 666 pu->pu_flags = pflags; 667 pu->pu_ops = *pops; 668 free(pops); /* XXX */ 669 670 pu->pu_privdata = priv; 671 pu->pu_cc_stackshift = PUFFS_CC_STACKSHIFT_DEFAULT; 672 LIST_INIT(&pu->pu_pnodelst); 673 LIST_INIT(&pu->pu_ios); 674 LIST_INIT(&pu->pu_ios_rmlist); 675 LIST_INIT(&pu->pu_ccmagazin); 676 TAILQ_INIT(&pu->pu_sched); 677 678 pu->pu_framectrl[PU_FRAMECTRL_FS].rfb = puffs__fsframe_read; 679 pu->pu_framectrl[PU_FRAMECTRL_FS].wfb = puffs__fsframe_write; 680 pu->pu_framectrl[PU_FRAMECTRL_FS].cmpfb = puffs__fsframe_cmp; 681 pu->pu_framectrl[PU_FRAMECTRL_FS].gotfb = puffs__fsframe_gotframe; 682 pu->pu_framectrl[PU_FRAMECTRL_FS].fdnotfn = puffs_framev_unmountonclose; 683 684 /* defaults for some user-settable translation functions */ 685 pu->pu_cmap = NULL; /* identity translation */ 686 687 pu->pu_pathbuild = puffs_stdpath_buildpath; 688 pu->pu_pathfree = puffs_stdpath_freepath; 689 pu->pu_pathcmp = puffs_stdpath_cmppath; 690 pu->pu_pathtransform = NULL; 691 pu->pu_namemod = NULL; 692 693 pu->pu_errnotify = puffs_kernerr_log; 694 695 PU_SETSTATE(pu, PUFFS_STATE_BEFOREMOUNT); 696 697 return pu; 698 699 failfree: 700 /* can't unmount() from here for obvious reasons */ 701 sverrno = errno; 702 free(pu); 703 errno = sverrno; 704 return NULL; 705 } 706 707 void 708 puffs_cancel(struct puffs_usermount *pu, int error) 709 { 710 711 assert(puffs_getstate(pu) < PUFFS_STATE_RUNNING); 712 shutdaemon(pu, error); 713 free(pu); 714 } 715 716 /*ARGSUSED1*/ 717 int 718 puffs_exit(struct puffs_usermount *pu, int unused /* strict compat */) 719 { 720 struct puffs_framebuf *pb; 721 struct puffs_req *preq; 722 void *winp; 723 size_t winlen; 724 int sverrno; 725 726 pb = puffs_framebuf_make(); 727 if (pb == NULL) { 728 errno = ENOMEM; 729 return -1; 730 } 731 732 winlen = sizeof(struct puffs_req); 733 if (puffs_framebuf_getwindow(pb, 0, &winp, &winlen) == -1) { 734 sverrno = errno; 735 puffs_framebuf_destroy(pb); 736 errno = sverrno; 737 return -1; 738 } 739 preq = winp; 740 741 preq->preq_buflen = sizeof(struct puffs_req); 742 preq->preq_opclass = PUFFSOP_UNMOUNT; 743 preq->preq_id = puffs__nextreq(pu); 744 745 puffs_framev_enqueue_justsend(pu, puffs_getselectable(pu), pb, 1, 0); 746 747 return 0; 748 } 749 750 /* no sigset_t static intializer */ 751 static int sigs[NSIG] = { 0, }; 752 static int sigcatch = 0; 753 754 int 755 puffs_unmountonsignal(int sig, bool sigignore) 756 { 757 758 if (sig < 0 || sig >= (int)NSIG) { 759 errno = EINVAL; 760 return -1; 761 } 762 if (sigignore) 763 if (signal(sig, SIG_IGN) == SIG_ERR) 764 return -1; 765 766 if (!sigs[sig]) 767 sigcatch++; 768 sigs[sig] = 1; 769 770 return 0; 771 } 772 773 /* 774 * Actual mainloop. This is called from a context which can block. 775 * It is called either from puffs_mainloop (indirectly, via 776 * puffs_cc_continue() or from puffs_cc_yield()). 777 */ 778 void 779 puffs__theloop(struct puffs_cc *pcc) 780 { 781 struct puffs_usermount *pu = pcc->pcc_pu; 782 struct puffs_framectrl *pfctrl; 783 struct puffs_fctrl_io *fio; 784 struct kevent *curev; 785 size_t nchanges; 786 int ndone; 787 788 while (puffs_getstate(pu) != PUFFS_STATE_UNMOUNTED) { 789 790 /* 791 * Schedule existing requests. 792 */ 793 while ((pcc = TAILQ_FIRST(&pu->pu_sched)) != NULL) { 794 TAILQ_REMOVE(&pu->pu_sched, pcc, pcc_schedent); 795 puffs__goto(pcc); 796 } 797 798 if (pu->pu_ml_lfn) 799 pu->pu_ml_lfn(pu); 800 801 /* XXX: can we still do these optimizations? */ 802 #if 0 803 /* 804 * Do this here, because: 805 * a) loopfunc might generate some results 806 * b) it's still "after" event handling (except for round 1) 807 */ 808 if (puffs_req_putput(ppr) == -1) 809 goto out; 810 puffs_req_resetput(ppr); 811 812 /* micro optimization: skip kevent syscall if possible */ 813 if (pu->pu_nfds == 1 && pu->pu_ml_timep == NULL 814 && (pu->pu_state & PU_ASYNCFD) == 0) { 815 pfctrl = XXX->fctrl; 816 puffs_framev_input(pu, pfctrl, XXX); 817 continue; 818 } 819 #endif 820 821 /* else: do full processing */ 822 /* Don't bother worrying about O(n) for now */ 823 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 824 if (fio->stat & FIO_WRGONE) 825 continue; 826 827 pfctrl = fio->fctrl; 828 829 /* 830 * Try to write out everything to avoid the 831 * need for enabling EVFILT_WRITE. The likely 832 * case is that we can fit everything into the 833 * socket buffer. 834 */ 835 puffs__framev_output(pu, pfctrl, fio); 836 } 837 838 /* 839 * Build list of which to enable/disable in writecheck. 840 */ 841 nchanges = 0; 842 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 843 if (fio->stat & FIO_WRGONE) 844 continue; 845 846 /* en/disable write checks for kqueue as needed */ 847 assert((FIO_EN_WRITE(fio) && FIO_RM_WRITE(fio)) == 0); 848 if (FIO_EN_WRITE(fio)) { 849 EV_SET(&pu->pu_evs[nchanges], fio->io_fd, 850 EVFILT_WRITE, EV_ENABLE, 0, 0, 851 (uintptr_t)fio); 852 fio->stat |= FIO_WR; 853 nchanges++; 854 } 855 if (FIO_RM_WRITE(fio)) { 856 EV_SET(&pu->pu_evs[nchanges], fio->io_fd, 857 EVFILT_WRITE, EV_DISABLE, 0, 0, 858 (uintptr_t)fio); 859 fio->stat &= ~FIO_WR; 860 nchanges++; 861 } 862 } 863 864 ndone = kevent(pu->pu_kq, pu->pu_evs, nchanges, 865 pu->pu_evs, pu->pu_nevs, pu->pu_ml_timep); 866 867 if (ndone == -1) { 868 if (errno != EINTR) 869 break; 870 else 871 continue; 872 } 873 874 /* uoptimize */ 875 if (ndone == 0) 876 continue; 877 878 /* iterate over the results */ 879 for (curev = pu->pu_evs; ndone--; curev++) { 880 int what; 881 882 #if 0 883 /* get & possibly dispatch events from kernel */ 884 if (curev->ident == puffsfd) { 885 if (puffs_req_handle(pgr, ppr, 0) == -1) 886 goto out; 887 continue; 888 } 889 #endif 890 891 fio = (void *)curev->udata; 892 if (__predict_true(fio)) 893 pfctrl = fio->fctrl; 894 else 895 pfctrl = NULL; 896 if (curev->flags & EV_ERROR) { 897 assert(curev->filter == EVFILT_WRITE); 898 fio->stat &= ~FIO_WR; 899 900 /* XXX: how to know if it's a transient error */ 901 puffs__framev_writeclose(pu, fio, 902 (int)curev->data); 903 puffs__framev_notify(fio, PUFFS_FBIO_ERROR); 904 continue; 905 } 906 907 what = 0; 908 if (curev->filter == EVFILT_READ) { 909 puffs__framev_input(pu, pfctrl, fio); 910 what |= PUFFS_FBIO_READ; 911 } 912 913 else if (curev->filter == EVFILT_WRITE) { 914 puffs__framev_output(pu, pfctrl, fio); 915 what |= PUFFS_FBIO_WRITE; 916 } 917 918 else if (__predict_false(curev->filter==EVFILT_SIGNAL)){ 919 if ((pu->pu_state & PU_DONEXIT) == 0) { 920 PU_SETSFLAG(pu, PU_DONEXIT); 921 puffs_exit(pu, 0); 922 } 923 } 924 if (what) 925 puffs__framev_notify(fio, what); 926 } 927 928 /* 929 * Really free fd's now that we don't have references 930 * to them. 931 */ 932 while ((fio = LIST_FIRST(&pu->pu_ios_rmlist)) != NULL) { 933 LIST_REMOVE(fio, fio_entries); 934 free(fio); 935 } 936 } 937 938 if (puffs__cc_restoremain(pu) == -1) 939 warn("cannot restore main context. impending doom"); 940 } 941 int 942 puffs_mainloop(struct puffs_usermount *pu) 943 { 944 struct puffs_fctrl_io *fio; 945 struct puffs_cc *pcc; 946 struct kevent *curev; 947 size_t nevs; 948 int sverrno, i; 949 950 assert(puffs_getstate(pu) >= PUFFS_STATE_RUNNING); 951 952 pu->pu_kq = kqueue(); 953 if (pu->pu_kq == -1) 954 goto out; 955 pu->pu_state |= PU_HASKQ; 956 957 puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK); 958 if (puffs__framev_addfd_ctrl(pu, puffs_getselectable(pu), 959 PUFFS_FBIO_READ | PUFFS_FBIO_WRITE, 960 &pu->pu_framectrl[PU_FRAMECTRL_FS]) == -1) 961 goto out; 962 963 nevs = pu->pu_nevs + sigcatch; 964 curev = realloc(pu->pu_evs, nevs * sizeof(struct kevent)); 965 if (curev == NULL) 966 goto out; 967 pu->pu_evs = curev; 968 pu->pu_nevs = nevs; 969 970 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 971 EV_SET(curev, fio->io_fd, EVFILT_READ, EV_ADD, 972 0, 0, (uintptr_t)fio); 973 curev++; 974 EV_SET(curev, fio->io_fd, EVFILT_WRITE, EV_ADD | EV_DISABLE, 975 0, 0, (uintptr_t)fio); 976 curev++; 977 } 978 for (i = 0; i < NSIG; i++) { 979 if (sigs[i]) { 980 EV_SET(curev, i, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 981 0, 0, 0); 982 curev++; 983 } 984 } 985 assert(curev - pu->pu_evs == (ssize_t)pu->pu_nevs); 986 if (kevent(pu->pu_kq, pu->pu_evs, pu->pu_nevs, NULL, 0, NULL) == -1) 987 goto out; 988 989 pu->pu_state |= PU_INLOOP; 990 991 /* 992 * Create alternate execution context and jump to it. Note 993 * that we come "out" of savemain twice. Where we come out 994 * of it depends on the architecture. If the return address is 995 * stored on the stack, we jump out from puffs_cc_continue(), 996 * for a register return address from puffs__cc_savemain(). 997 * PU_MAINRESTORE makes sure we DTRT in both cases. 998 */ 999 if (puffs__cc_create(pu, puffs__theloop, &pcc) == -1) { 1000 goto out; 1001 } 1002 1003 #if 0 1004 if (puffs__cc_savemain(pu) == -1) { 1005 goto out; 1006 } 1007 #else 1008 /* 1009 * XXX 1010 * puffs__cc_savemain() uses getcontext() and then returns. 1011 * the caller (this function) may overwrite the stack frame 1012 * of puffs__cc_savemain(), so when we call setcontext() later and 1013 * return from puffs__cc_savemain() again, the return address or 1014 * saved stack pointer can be garbage. 1015 * avoid this by calling getcontext() directly here. 1016 */ 1017 extern int puffs_fakecc; 1018 if (!puffs_fakecc) { 1019 PU_CLRSFLAG(pu, PU_MAINRESTORE); 1020 if (getcontext(&pu->pu_mainctx) == -1) { 1021 goto out; 1022 } 1023 } 1024 #endif 1025 1026 if ((pu->pu_state & PU_MAINRESTORE) == 0) 1027 puffs_cc_continue(pcc); 1028 1029 finalpush(pu); 1030 errno = 0; 1031 1032 out: 1033 /* store the real error for a while */ 1034 sverrno = errno; 1035 1036 errno = sverrno; 1037 if (errno) 1038 return -1; 1039 else 1040 return 0; 1041 } 1042
Indexes created Thu Sep 25 16:09:42 GMT 2025