puffs.c revision 1.125
1 /* $NetBSD: puffs.c,v 1.125 2021/10/30 10:34:18 nia 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 1.125 2021/10/30 10:34:18 nia 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 warnx("%s: type %d, error %d, cookie %p (%s)", __func__, 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, "%s: type %d, error %d, cookie %p (%s)", __func__, 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 warnx("%s: adjusting " "stacksize to minimum %ld", 217 __func__, 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 warnx("%s: using next power of two: %d", __func__, 232 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("%s: call has effect only before mount", __func__); 274 return; 275 } 276 277 pargs->pa_root_vtype = vt; 278 pargs->pa_root_vsize = vsize; 279 pargs->pa_root_rdev = rdev; 280 } 281 282 void * 283 puffs_getspecific(struct puffs_usermount *pu) 284 { 285 286 return pu->pu_privdata; 287 } 288 289 void 290 puffs_setspecific(struct puffs_usermount *pu, void *privdata) 291 { 292 293 pu->pu_privdata = privdata; 294 } 295 296 void 297 puffs_setmntinfo(struct puffs_usermount *pu, 298 const char *mntfromname, const char *puffsname) 299 { 300 struct puffs_kargs *pargs = pu->pu_kargp; 301 302 (void)strlcpy(pargs->pa_mntfromname, mntfromname, 303 sizeof(pargs->pa_mntfromname)); 304 (void)strlcpy(pargs->pa_typename, puffsname, 305 sizeof(pargs->pa_typename)); 306 } 307 308 size_t 309 puffs_getmaxreqlen(struct puffs_usermount *pu) 310 { 311 312 return pu->pu_maxreqlen; 313 } 314 315 void 316 puffs_setmaxreqlen(struct puffs_usermount *pu, size_t reqlen) 317 { 318 319 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) 320 warnx("%s: call has effect only before mount", __func__); 321 322 pu->pu_kargp->pa_maxmsglen = reqlen; 323 } 324 325 void 326 puffs_setfhsize(struct puffs_usermount *pu, size_t fhsize, int flags) 327 { 328 329 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) 330 warnx("%s: call has effect only before mount", __func__); 331 332 pu->pu_kargp->pa_fhsize = fhsize; 333 pu->pu_kargp->pa_fhflags = flags; 334 } 335 336 void 337 puffs_setncookiehash(struct puffs_usermount *pu, int nhash) 338 { 339 340 if (puffs_getstate(pu) != PUFFS_STATE_BEFOREMOUNT) 341 warnx("%s: call has effect only before mount", __func__); 342 343 pu->pu_kargp->pa_nhashbuckets = nhash; 344 } 345 346 void 347 puffs_set_pathbuild(struct puffs_usermount *pu, pu_pathbuild_fn fn) 348 { 349 350 pu->pu_pathbuild = fn; 351 } 352 353 void 354 puffs_set_pathtransform(struct puffs_usermount *pu, pu_pathtransform_fn fn) 355 { 356 357 pu->pu_pathtransform = fn; 358 } 359 360 void 361 puffs_set_pathcmp(struct puffs_usermount *pu, pu_pathcmp_fn fn) 362 { 363 364 pu->pu_pathcmp = fn; 365 } 366 367 void 368 puffs_set_pathfree(struct puffs_usermount *pu, pu_pathfree_fn fn) 369 { 370 371 pu->pu_pathfree = fn; 372 } 373 374 void 375 puffs_set_namemod(struct puffs_usermount *pu, pu_namemod_fn fn) 376 { 377 378 pu->pu_namemod = fn; 379 } 380 381 void 382 puffs_set_errnotify(struct puffs_usermount *pu, pu_errnotify_fn fn) 383 { 384 385 pu->pu_errnotify = fn; 386 } 387 388 void 389 puffs_set_cmap(struct puffs_usermount *pu, pu_cmap_fn fn) 390 { 391 392 pu->pu_cmap = fn; 393 } 394 395 void 396 puffs_ml_setloopfn(struct puffs_usermount *pu, puffs_ml_loop_fn lfn) 397 { 398 399 pu->pu_ml_lfn = lfn; 400 } 401 402 void 403 puffs_ml_settimeout(struct puffs_usermount *pu, struct timespec *ts) 404 { 405 406 if (ts == NULL) { 407 pu->pu_ml_timep = NULL; 408 } else { 409 pu->pu_ml_timeout = *ts; 410 pu->pu_ml_timep = &pu->pu_ml_timeout; 411 } 412 } 413 414 void 415 puffs_set_prepost(struct puffs_usermount *pu, 416 pu_prepost_fn pre, pu_prepost_fn pst) 417 { 418 419 pu->pu_oppre = pre; 420 pu->pu_oppost = pst; 421 } 422 423 void 424 puffs_setback(struct puffs_cc *pcc, int whatback) 425 { 426 struct puffs_req *preq = puffs__framebuf_getdataptr(pcc->pcc_pb); 427 428 assert(PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN && ( 429 preq->preq_optype == PUFFS_VN_OPEN || 430 preq->preq_optype == PUFFS_VN_MMAP || 431 preq->preq_optype == PUFFS_VN_REMOVE || 432 preq->preq_optype == PUFFS_VN_RMDIR || 433 preq->preq_optype == PUFFS_VN_INACTIVE)); 434 435 preq->preq_setbacks |= whatback & PUFFS_SETBACK_MASK; 436 } 437 438 int 439 puffs_daemon(struct puffs_usermount *pu, int nochdir, int noclose) 440 { 441 long int n; 442 int parent, value, fd; 443 444 if (pipe(pu->pu_dpipe) == -1) 445 return -1; 446 447 switch (fork()) { 448 case -1: 449 return -1; 450 case 0: 451 parent = 0; 452 break; 453 default: 454 parent = 1; 455 break; 456 } 457 pu->pu_state |= PU_PUFFSDAEMON; 458 459 if (parent) { 460 close(pu->pu_dpipe[1]); 461 n = read(pu->pu_dpipe[0], &value, sizeof(int)); 462 if (n == -1) 463 err(1, "puffs_daemon"); 464 if (n != sizeof(value)) 465 errx(1, "puffs_daemon got %ld bytes", n); 466 if (value) { 467 errno = value; 468 err(1, "puffs_daemon"); 469 } 470 exit(0); 471 } else { 472 if (setsid() == -1) 473 goto fail; 474 475 if (!nochdir) 476 chdir("/"); 477 478 if (!noclose) { 479 fd = open(_PATH_DEVNULL, O_RDWR, 0); 480 if (fd == -1) 481 goto fail; 482 dup2(fd, STDIN_FILENO); 483 dup2(fd, STDOUT_FILENO); 484 dup2(fd, STDERR_FILENO); 485 if (fd > STDERR_FILENO) 486 close(fd); 487 } 488 return 0; 489 } 490 491 fail: 492 n = write(pu->pu_dpipe[1], &errno, sizeof(int)); 493 assert(n == 4); 494 return -1; 495 } 496 497 static void 498 shutdaemon(struct puffs_usermount *pu, int error) 499 { 500 ssize_t n; 501 502 n = write(pu->pu_dpipe[1], &error, sizeof(int)); 503 assert(n == 4); 504 close(pu->pu_dpipe[0]); 505 close(pu->pu_dpipe[1]); 506 pu->pu_state &= ~PU_PUFFSDAEMON; 507 } 508 509 int 510 puffs_mount(struct puffs_usermount *pu, const char *dir, int mntflags, 511 puffs_cookie_t cookie) 512 { 513 int rv, fd, sverrno; 514 char *comfd; 515 516 pu->pu_kargp->pa_root_cookie = cookie; 517 518 /* XXXkludgehere */ 519 /* kauth doesn't provide this service any longer */ 520 if (geteuid() != 0) 521 mntflags |= MNT_NOSUID | MNT_NODEV; 522 523 /* 524 * Undocumented... Well, documented only here. 525 * 526 * This is used for imaginative purposes. If the env variable is 527 * set, puffs_mount() doesn't do the regular mount procedure. 528 * Rather, it crams the mount data down the comfd and sets comfd as 529 * the puffs descriptor. 530 * 531 * This shouldn't be used unless you can read my mind ( ... or write 532 * it, not to mention execute it, but that's starting to get silly). 533 */ 534 if ((comfd = getenv("PUFFS_COMFD")) != NULL) { 535 size_t len; 536 537 if (sscanf(comfd, "%d", &pu->pu_fd) != 1) { 538 errno = EINVAL; 539 rv = -1; 540 goto out; 541 } 542 /* check that what we got at least resembles an fd */ 543 if (fcntl(pu->pu_fd, F_GETFL) == -1) { 544 rv = -1; 545 goto out; 546 } 547 548 #define allwrite(buf, len) \ 549 do { \ 550 ssize_t al_rv; \ 551 al_rv = write(pu->pu_fd, buf, len); \ 552 if ((size_t)al_rv != len) { \ 553 if (al_rv != -1) \ 554 errno = EIO; \ 555 rv = -1; \ 556 goto out; \ 557 } \ 558 } while (/*CONSTCOND*/0) 559 len = strlen(dir)+1; 560 allwrite(&len, sizeof(len)); 561 allwrite(dir, len); 562 len = strlen(pu->pu_kargp->pa_mntfromname)+1; 563 allwrite(&len, sizeof(len)); 564 allwrite(pu->pu_kargp->pa_mntfromname, len); 565 allwrite(&mntflags, sizeof(mntflags)); 566 len = sizeof(*pu->pu_kargp); 567 allwrite(&len, sizeof(len)); 568 allwrite(pu->pu_kargp, sizeof(*pu->pu_kargp)); 569 allwrite(&pu->pu_flags, sizeof(pu->pu_flags)); 570 #undef allwrite 571 572 rv = 0; 573 } else { 574 char rp[MAXPATHLEN]; 575 size_t rplen,dirlen; 576 577 if (realpath(dir, rp) == NULL) { 578 rv = -1; 579 goto out; 580 } 581 582 rplen = strlen(rp); 583 dirlen = strlen(dir); 584 if (strncmp(dir, rp, rplen) != 0 || 585 strspn(dir + rplen, "/") != dirlen - rplen) { 586 warnx("%s: `%s' is a %s path.", __func__, dir, 587 dir[0] != '/' ? "relative" : "non canonical"); 588 warnx("%s: using `%s' instead.", __func__, rp); 589 } 590 591 fd = open(_PATH_PUFFS, O_RDWR); 592 if (fd == -1) { 593 warnx("%s: cannot open `%s'", __func__, _PATH_PUFFS); 594 rv = -1; 595 goto out; 596 } 597 if (fd <= 2) 598 warnx("%s: device fd %d (<= 2), sure this is " 599 "what you want?", __func__, fd); 600 601 pu->pu_kargp->pa_fd = pu->pu_fd = fd; 602 if ((rv = mount(MOUNT_PUFFS, rp, mntflags, 603 pu->pu_kargp, sizeof(struct puffs_kargs))) == -1) 604 goto out; 605 } 606 607 PU_SETSTATE(pu, PUFFS_STATE_RUNNING); 608 609 out: 610 if (rv != 0) 611 sverrno = errno; 612 else 613 sverrno = 0; 614 free(pu->pu_kargp); 615 pu->pu_kargp = NULL; 616 617 if (pu->pu_state & PU_PUFFSDAEMON) 618 shutdaemon(pu, sverrno); 619 620 errno = sverrno; 621 return rv; 622 } 623 624 struct puffs_usermount * 625 puffs_init(struct puffs_ops *pops, const char *mntfromname, 626 const char *puffsname, void *priv, uint32_t pflags) 627 { 628 struct puffs_usermount *pu; 629 struct puffs_kargs *pargs; 630 int sverrno; 631 632 if (puffsname == PUFFS_DEFER) 633 puffsname = "n/a"; 634 if (mntfromname == PUFFS_DEFER) 635 mntfromname = "n/a"; 636 if (priv == PUFFS_DEFER) 637 priv = NULL; 638 639 pu = malloc(sizeof(struct puffs_usermount)); 640 if (pu == NULL) 641 goto failfree; 642 memset(pu, 0, sizeof(struct puffs_usermount)); 643 644 pargs = pu->pu_kargp = malloc(sizeof(struct puffs_kargs)); 645 if (pargs == NULL) 646 goto failfree; 647 memset(pargs, 0, sizeof(struct puffs_kargs)); 648 649 pargs->pa_vers = PUFFSVERSION; 650 pargs->pa_flags = PUFFS_FLAG_KERN(pflags); 651 fillvnopmask(pops, pargs); 652 puffs_setmntinfo(pu, mntfromname, puffsname); 653 654 puffs_zerostatvfs(&pargs->pa_svfsb); 655 pargs->pa_root_cookie = NULL; 656 pargs->pa_root_vtype = VDIR; 657 pargs->pa_root_vsize = 0; 658 pargs->pa_root_rdev = 0; 659 pargs->pa_maxmsglen = 0; 660 if (/*CONSTCOND*/ sizeof(time_t) == 4) 661 pargs->pa_time32 = 1; 662 else 663 pargs->pa_time32 = 0; 664 665 pu->pu_flags = pflags; 666 pu->pu_ops = *pops; 667 free(pops); /* XXX */ 668 669 pu->pu_privdata = priv; 670 pu->pu_cc_stackshift = PUFFS_CC_STACKSHIFT_DEFAULT; 671 LIST_INIT(&pu->pu_pnodelst); 672 LIST_INIT(&pu->pu_ios); 673 LIST_INIT(&pu->pu_ios_rmlist); 674 LIST_INIT(&pu->pu_ccmagazin); 675 TAILQ_INIT(&pu->pu_sched); 676 677 pu->pu_framectrl[PU_FRAMECTRL_FS].rfb = puffs__fsframe_read; 678 pu->pu_framectrl[PU_FRAMECTRL_FS].wfb = puffs__fsframe_write; 679 pu->pu_framectrl[PU_FRAMECTRL_FS].cmpfb = puffs__fsframe_cmp; 680 pu->pu_framectrl[PU_FRAMECTRL_FS].gotfb = puffs__fsframe_gotframe; 681 pu->pu_framectrl[PU_FRAMECTRL_FS].fdnotfn = puffs_framev_unmountonclose; 682 683 /* defaults for some user-settable translation functions */ 684 pu->pu_cmap = NULL; /* identity translation */ 685 686 pu->pu_pathbuild = puffs_stdpath_buildpath; 687 pu->pu_pathfree = puffs_stdpath_freepath; 688 pu->pu_pathcmp = puffs_stdpath_cmppath; 689 pu->pu_pathtransform = NULL; 690 pu->pu_namemod = NULL; 691 692 pu->pu_errnotify = puffs_kernerr_log; 693 694 PU_SETSTATE(pu, PUFFS_STATE_BEFOREMOUNT); 695 696 return pu; 697 698 failfree: 699 /* can't unmount() from here for obvious reasons */ 700 sverrno = errno; 701 free(pu); 702 errno = sverrno; 703 return NULL; 704 } 705 706 void 707 puffs_cancel(struct puffs_usermount *pu, int error) 708 { 709 710 assert(puffs_getstate(pu) < PUFFS_STATE_RUNNING); 711 shutdaemon(pu, error); 712 free(pu); 713 } 714 715 /*ARGSUSED1*/ 716 int 717 puffs_exit(struct puffs_usermount *pu, int unused /* strict compat */) 718 { 719 struct puffs_framebuf *pb; 720 struct puffs_req *preq; 721 void *winp; 722 size_t winlen; 723 int sverrno; 724 725 pb = puffs_framebuf_make(); 726 if (pb == NULL) { 727 errno = ENOMEM; 728 return -1; 729 } 730 731 winlen = sizeof(struct puffs_req); 732 if (puffs_framebuf_getwindow(pb, 0, &winp, &winlen) == -1) { 733 sverrno = errno; 734 puffs_framebuf_destroy(pb); 735 errno = sverrno; 736 return -1; 737 } 738 preq = winp; 739 740 preq->preq_buflen = sizeof(struct puffs_req); 741 preq->preq_opclass = PUFFSOP_UNMOUNT; 742 preq->preq_id = puffs__nextreq(pu); 743 744 puffs_framev_enqueue_justsend(pu, puffs_getselectable(pu), pb, 1, 0); 745 746 return 0; 747 } 748 749 /* no sigset_t static initializer */ 750 static int sigs[NSIG] = { 0, }; 751 static int sigcatch = 0; 752 753 int 754 puffs_unmountonsignal(int sig, bool sigignore) 755 { 756 757 if (sig < 0 || sig >= (int)NSIG) { 758 errno = EINVAL; 759 return -1; 760 } 761 if (sigignore) 762 if (signal(sig, SIG_IGN) == SIG_ERR) 763 return -1; 764 765 if (!sigs[sig]) 766 sigcatch++; 767 sigs[sig] = 1; 768 769 return 0; 770 } 771 772 /* 773 * Actual mainloop. This is called from a context which can block. 774 * It is called either from puffs_mainloop (indirectly, via 775 * puffs_cc_continue() or from puffs_cc_yield()). 776 */ 777 void 778 puffs__theloop(struct puffs_cc *pcc) 779 { 780 struct puffs_usermount *pu = pcc->pcc_pu; 781 struct puffs_framectrl *pfctrl; 782 struct puffs_fctrl_io *fio; 783 struct kevent *curev; 784 size_t nchanges; 785 int ndone; 786 787 while (puffs_getstate(pu) != PUFFS_STATE_UNMOUNTED) { 788 789 /* 790 * Schedule existing requests. 791 */ 792 while ((pcc = TAILQ_FIRST(&pu->pu_sched)) != NULL) { 793 TAILQ_REMOVE(&pu->pu_sched, pcc, pcc_schedent); 794 puffs__goto(pcc); 795 } 796 797 if (pu->pu_ml_lfn) 798 pu->pu_ml_lfn(pu); 799 800 /* XXX: can we still do these optimizations? */ 801 #if 0 802 /* 803 * Do this here, because: 804 * a) loopfunc might generate some results 805 * b) it's still "after" event handling (except for round 1) 806 */ 807 if (puffs_req_putput(ppr) == -1) 808 goto out; 809 puffs_req_resetput(ppr); 810 811 /* micro optimization: skip kevent syscall if possible */ 812 if (pu->pu_nfds == 1 && pu->pu_ml_timep == NULL 813 && (pu->pu_state & PU_ASYNCFD) == 0) { 814 pfctrl = XXX->fctrl; 815 puffs_framev_input(pu, pfctrl, XXX); 816 continue; 817 } 818 #endif 819 820 /* else: do full processing */ 821 /* Don't bother worrying about O(n) for now */ 822 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 823 if (fio->stat & FIO_WRGONE) 824 continue; 825 826 pfctrl = fio->fctrl; 827 828 /* 829 * Try to write out everything to avoid the 830 * need for enabling EVFILT_WRITE. The likely 831 * case is that we can fit everything into the 832 * socket buffer. 833 */ 834 puffs__framev_output(pu, pfctrl, fio); 835 } 836 837 /* 838 * Build list of which to enable/disable in writecheck. 839 */ 840 nchanges = 0; 841 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 842 if (fio->stat & FIO_WRGONE) 843 continue; 844 845 /* en/disable write checks for kqueue as needed */ 846 assert((FIO_EN_WRITE(fio) && FIO_RM_WRITE(fio)) == 0); 847 if (FIO_EN_WRITE(fio)) { 848 EV_SET(&pu->pu_evs[nchanges], fio->io_fd, 849 EVFILT_WRITE, EV_ENABLE, 0, 0, 850 (intptr_t)fio); 851 fio->stat |= FIO_WR; 852 nchanges++; 853 } 854 if (FIO_RM_WRITE(fio)) { 855 EV_SET(&pu->pu_evs[nchanges], fio->io_fd, 856 EVFILT_WRITE, EV_DISABLE, 0, 0, 857 (intptr_t)fio); 858 fio->stat &= ~FIO_WR; 859 nchanges++; 860 } 861 } 862 863 ndone = kevent(pu->pu_kq, pu->pu_evs, nchanges, 864 pu->pu_evs, pu->pu_nevs, pu->pu_ml_timep); 865 866 if (ndone == -1) { 867 if (errno != EINTR) 868 break; 869 else 870 continue; 871 } 872 873 /* uoptimize */ 874 if (ndone == 0) 875 continue; 876 877 /* iterate over the results */ 878 for (curev = pu->pu_evs; ndone--; curev++) { 879 int what; 880 881 #if 0 882 /* get & possibly dispatch events from kernel */ 883 if (curev->ident == puffsfd) { 884 if (puffs_req_handle(pgr, ppr, 0) == -1) 885 goto out; 886 continue; 887 } 888 #endif 889 890 fio = (void *)curev->udata; 891 if (__predict_true(fio)) 892 pfctrl = fio->fctrl; 893 else 894 pfctrl = NULL; 895 if (curev->flags & EV_ERROR) { 896 assert(curev->filter == EVFILT_WRITE); 897 fio->stat &= ~FIO_WR; 898 899 /* XXX: how to know if it's a transient error */ 900 puffs__framev_writeclose(pu, fio, 901 (int)curev->data); 902 puffs__framev_notify(fio, PUFFS_FBIO_ERROR); 903 continue; 904 } 905 906 what = 0; 907 switch (curev->filter) { 908 case EVFILT_READ: 909 puffs__framev_input(pu, pfctrl, fio); 910 what |= PUFFS_FBIO_READ; 911 break; 912 case EVFILT_WRITE: 913 puffs__framev_output(pu, pfctrl, fio); 914 what |= PUFFS_FBIO_WRITE; 915 break; 916 case EVFILT_SIGNAL: 917 if ((pu->pu_state & PU_DONEXIT) == 0) { 918 PU_SETSFLAG(pu, PU_DONEXIT); 919 puffs_exit(pu, 0); 920 } 921 break; 922 default: 923 warn("unhandled filter %d", curev->filter); 924 } 925 if (what) 926 puffs__framev_notify(fio, what); 927 } 928 929 /* 930 * Really free fd's now that we don't have references 931 * to them. 932 */ 933 while ((fio = LIST_FIRST(&pu->pu_ios_rmlist)) != NULL) { 934 LIST_REMOVE(fio, fio_entries); 935 free(fio); 936 } 937 } 938 939 if (puffs__cc_restoremain(pu) == -1) 940 warn("cannot restore main context. impending doom"); 941 } 942 int 943 puffs_mainloop(struct puffs_usermount *pu) 944 { 945 struct puffs_fctrl_io *fio; 946 struct puffs_cc *pcc; 947 struct kevent *curev; 948 size_t nevs; 949 int sverrno, i; 950 951 assert(puffs_getstate(pu) >= PUFFS_STATE_RUNNING); 952 953 pu->pu_kq = kqueue(); 954 if (pu->pu_kq == -1) 955 goto out; 956 pu->pu_state |= PU_HASKQ; 957 958 puffs_setblockingmode(pu, PUFFSDEV_NONBLOCK); 959 if (puffs__framev_addfd_ctrl(pu, puffs_getselectable(pu), 960 PUFFS_FBIO_READ | PUFFS_FBIO_WRITE, 961 &pu->pu_framectrl[PU_FRAMECTRL_FS]) == -1) 962 goto out; 963 964 nevs = pu->pu_nevs + sigcatch; 965 if (reallocarr(&pu->pu_evs, nevs, sizeof(struct kevent)) != 0) { 966 errno = ENOMEM; 967 goto out; 968 } 969 pu->pu_nevs = nevs; 970 971 curev = pu->pu_evs; 972 973 LIST_FOREACH(fio, &pu->pu_ios, fio_entries) { 974 EV_SET(curev, fio->io_fd, EVFILT_READ, EV_ADD, 975 0, 0, (intptr_t)fio); 976 curev++; 977 EV_SET(curev, fio->io_fd, EVFILT_WRITE, EV_ADD | EV_DISABLE, 978 0, 0, (intptr_t)fio); 979 curev++; 980 } 981 for (i = 0; i < NSIG; i++) { 982 if (sigs[i]) { 983 EV_SET(curev, i, EVFILT_SIGNAL, EV_ADD | EV_ENABLE, 984 0, 0, 0); 985 curev++; 986 } 987 } 988 assert(curev - pu->pu_evs == (ssize_t)pu->pu_nevs); 989 if (kevent(pu->pu_kq, pu->pu_evs, pu->pu_nevs, NULL, 0, NULL) == -1) 990 goto out; 991 992 pu->pu_state |= PU_INLOOP; 993 994 /* 995 * Create alternate execution context and jump to it. Note 996 * that we come "out" of savemain twice. Where we come out 997 * of it depends on the architecture. If the return address is 998 * stored on the stack, we jump out from puffs_cc_continue(), 999 * for a register return address from puffs__cc_savemain(). 1000 * PU_MAINRESTORE makes sure we DTRT in both cases. 1001 */ 1002 if (puffs__cc_create(pu, puffs__theloop, &pcc) == -1) { 1003 goto out; 1004 } 1005 1006 #if 0 1007 if (puffs__cc_savemain(pu) == -1) { 1008 goto out; 1009 } 1010 #else 1011 /* 1012 * XXX 1013 * puffs__cc_savemain() uses getcontext() and then returns. 1014 * the caller (this function) may overwrite the stack frame 1015 * of puffs__cc_savemain(), so when we call setcontext() later and 1016 * return from puffs__cc_savemain() again, the return address or 1017 * saved stack pointer can be garbage. 1018 * avoid this by calling getcontext() directly here. 1019 */ 1020 extern int puffs_fakecc; 1021 if (!puffs_fakecc) { 1022 PU_CLRSFLAG(pu, PU_MAINRESTORE); 1023 if (getcontext(&pu->pu_mainctx) == -1) { 1024 goto out; 1025 } 1026 } 1027 #endif 1028 1029 if ((pu->pu_state & PU_MAINRESTORE) == 0) 1030 puffs_cc_continue(pcc); 1031 1032 finalpush(pu); 1033 errno = 0; 1034 1035 out: 1036 /* store the real error for a while */ 1037 sverrno = errno; 1038 1039 errno = sverrno; 1040 if (errno) 1041 return -1; 1042 else 1043 return 0; 1044 } 1045
Indexes created Wed Sep 24 02:09:48 GMT 2025