1 /*- 2 * Copyright (c) 2010 Marcel Moolenaar 3 * Copyright (c) 1999-2004 Poul-Henning Kamp 4 * Copyright (c) 1999 Michael Smith 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include "opt_rootdevname.h" 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/conf.h> 45 #include <sys/cons.h> 46 #include <sys/fcntl.h> 47 #include <sys/jail.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/mdioctl.h> 51 #include <sys/mount.h> 52 #include <sys/mutex.h> 53 #include <sys/namei.h> 54 #include <sys/priv.h> 55 #include <sys/proc.h> 56 #include <sys/filedesc.h> 57 #include <sys/reboot.h> 58 #include <sys/sbuf.h> 59 #include <sys/stat.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysproto.h> 62 #include <sys/sx.h> 63 #include <sys/sysctl.h> 64 #include <sys/sysent.h> 65 #include <sys/systm.h> 66 #include <sys/vnode.h> 67 68 #include <geom/geom.h> 69 70 /* 71 * The root filesystem is detailed in the kernel environment variable 72 * vfs.root.mountfrom, which is expected to be in the general format 73 * 74 * <vfsname>:[<path>][ <vfsname>:[<path>] ...] 75 * vfsname := the name of a VFS known to the kernel and capable 76 * of being mounted as root 77 * path := disk device name or other data used by the filesystem 78 * to locate its physical store 79 * 80 * If the environment variable vfs.root.mountfrom is a space separated list, 81 * each list element is tried in turn and the root filesystem will be mounted 82 * from the first one that suceeds. 83 * 84 * The environment variable vfs.root.mountfrom.options is a comma delimited 85 * set of string mount options. These mount options must be parseable 86 * by nmount() in the kernel. 87 */ 88 89 static int parse_mount(char **); 90 static struct mntarg *parse_mountroot_options(struct mntarg *, const char *); 91 92 /* 93 * The vnode of the system's root (/ in the filesystem, without chroot 94 * active.) 95 */ 96 struct vnode *rootvnode; 97 98 /* 99 * Mount of the system's /dev. 100 */ 101 struct mount *rootdevmp; 102 103 char *rootdevnames[2] = {NULL, NULL}; 104 105 struct mtx root_holds_mtx; 106 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 107 108 struct root_hold_token { 109 const char *who; 110 LIST_ENTRY(root_hold_token) list; 111 }; 112 113 static LIST_HEAD(, root_hold_token) root_holds = 114 LIST_HEAD_INITIALIZER(root_holds); 115 116 enum action { 117 A_CONTINUE, 118 A_PANIC, 119 A_REBOOT, 120 A_RETRY 121 }; 122 123 static enum action root_mount_onfail = A_CONTINUE; 124 125 static int root_mount_mddev; 126 static int root_mount_complete; 127 128 /* By default wait up to 3 seconds for devices to appear. */ 129 static int root_mount_timeout = 3; 130 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 131 132 struct root_hold_token * 133 root_mount_hold(const char *identifier) 134 { 135 struct root_hold_token *h; 136 137 if (root_mounted()) 138 return (NULL); 139 140 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 141 h->who = identifier; 142 mtx_lock(&root_holds_mtx); 143 LIST_INSERT_HEAD(&root_holds, h, list); 144 mtx_unlock(&root_holds_mtx); 145 return (h); 146 } 147 148 void 149 root_mount_rel(struct root_hold_token *h) 150 { 151 152 if (h == NULL) 153 return; 154 mtx_lock(&root_holds_mtx); 155 LIST_REMOVE(h, list); 156 wakeup(&root_holds); 157 mtx_unlock(&root_holds_mtx); 158 free(h, M_DEVBUF); 159 } 160 161 int 162 root_mounted(void) 163 { 164 165 /* No mutex is acquired here because int stores are atomic. */ 166 return (root_mount_complete); 167 } 168 169 void 170 root_mount_wait(void) 171 { 172 173 /* 174 * Panic on an obvious deadlock - the function can't be called from 175 * a thread which is doing the whole SYSINIT stuff. 176 */ 177 KASSERT(curthread->td_proc->p_pid != 0, 178 ("root_mount_wait: cannot be called from the swapper thread")); 179 mtx_lock(&root_holds_mtx); 180 while (!root_mount_complete) { 181 msleep(&root_mount_complete, &root_holds_mtx, PZERO, "rootwait", 182 hz); 183 } 184 mtx_unlock(&root_holds_mtx); 185 } 186 187 static void 188 set_rootvnode(void) 189 { 190 struct proc *p; 191 192 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 193 panic("Cannot find root vnode"); 194 195 VOP_UNLOCK(rootvnode, 0); 196 197 p = curthread->td_proc; 198 FILEDESC_XLOCK(p->p_fd); 199 200 if (p->p_fd->fd_cdir != NULL) 201 vrele(p->p_fd->fd_cdir); 202 p->p_fd->fd_cdir = rootvnode; 203 VREF(rootvnode); 204 205 if (p->p_fd->fd_rdir != NULL) 206 vrele(p->p_fd->fd_rdir); 207 p->p_fd->fd_rdir = rootvnode; 208 VREF(rootvnode); 209 210 FILEDESC_XUNLOCK(p->p_fd); 211 } 212 213 static int 214 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 215 { 216 struct vfsoptlist *opts; 217 struct vfsconf *vfsp; 218 struct mount *mp; 219 int error; 220 221 *mpp = NULL; 222 223 vfsp = vfs_byname("devfs"); 224 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 225 if (vfsp == NULL) 226 return (ENOENT); 227 228 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 229 230 error = VFS_MOUNT(mp); 231 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 232 if (error) 233 return (error); 234 235 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 236 TAILQ_INIT(opts); 237 mp->mnt_opt = opts; 238 239 mtx_lock(&mountlist_mtx); 240 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 241 mtx_unlock(&mountlist_mtx); 242 243 *mpp = mp; 244 rootdevmp = mp; 245 set_rootvnode(); 246 247 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 248 if (error) 249 printf("kern_symlink /dev -> / returns %d\n", error); 250 251 return (error); 252 } 253 254 static int 255 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 256 { 257 struct nameidata nd; 258 struct mount *mporoot, *mpnroot; 259 struct vnode *vp, *vporoot, *vpdevfs; 260 char *fspath; 261 int error; 262 263 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 264 265 /* Shuffle the mountlist. */ 266 mtx_lock(&mountlist_mtx); 267 mporoot = TAILQ_FIRST(&mountlist); 268 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 269 if (mporoot != mpdevfs) { 270 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 271 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 272 } 273 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 274 mtx_unlock(&mountlist_mtx); 275 276 cache_purgevfs(mporoot); 277 if (mporoot != mpdevfs) 278 cache_purgevfs(mpdevfs); 279 280 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 281 282 VI_LOCK(vporoot); 283 vporoot->v_iflag &= ~VI_MOUNT; 284 VI_UNLOCK(vporoot); 285 vporoot->v_mountedhere = NULL; 286 mporoot->mnt_flag &= ~MNT_ROOTFS; 287 mporoot->mnt_vnodecovered = NULL; 288 vput(vporoot); 289 290 /* Set up the new rootvnode, and purge the cache */ 291 mpnroot->mnt_vnodecovered = NULL; 292 set_rootvnode(); 293 cache_purgevfs(rootvnode->v_mount); 294 295 if (mporoot != mpdevfs) { 296 /* Remount old root under /.mount or /mnt */ 297 fspath = "/.mount"; 298 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 299 fspath, td); 300 error = namei(&nd); 301 if (error) { 302 NDFREE(&nd, NDF_ONLY_PNBUF); 303 fspath = "/mnt"; 304 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 305 fspath, td); 306 error = namei(&nd); 307 } 308 if (!error) { 309 vp = nd.ni_vp; 310 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 311 if (!error) 312 error = vinvalbuf(vp, V_SAVE, 0, 0); 313 if (!error) { 314 cache_purge(vp); 315 mporoot->mnt_vnodecovered = vp; 316 vp->v_mountedhere = mporoot; 317 strlcpy(mporoot->mnt_stat.f_mntonname, 318 fspath, MNAMELEN); 319 VOP_UNLOCK(vp, 0); 320 } else 321 vput(vp); 322 } 323 NDFREE(&nd, NDF_ONLY_PNBUF); 324 325 if (error && bootverbose) 326 printf("mountroot: unable to remount previous root " 327 "under /.mount or /mnt (error %d).\n", error); 328 } 329 330 /* Remount devfs under /dev */ 331 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 332 error = namei(&nd); 333 if (!error) { 334 vp = nd.ni_vp; 335 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 336 if (!error) 337 error = vinvalbuf(vp, V_SAVE, 0, 0); 338 if (!error) { 339 vpdevfs = mpdevfs->mnt_vnodecovered; 340 if (vpdevfs != NULL) { 341 cache_purge(vpdevfs); 342 vpdevfs->v_mountedhere = NULL; 343 vrele(vpdevfs); 344 } 345 mpdevfs->mnt_vnodecovered = vp; 346 vp->v_mountedhere = mpdevfs; 347 VOP_UNLOCK(vp, 0); 348 } else 349 vput(vp); 350 } 351 if (error && bootverbose) 352 printf("mountroot: unable to remount devfs under /dev " 353 "(error %d).\n", error); 354 NDFREE(&nd, NDF_ONLY_PNBUF); 355 356 if (mporoot == mpdevfs) { 357 vfs_unbusy(mpdevfs); 358 /* Unlink the no longer needed /dev/dev -> / symlink */ 359 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 360 UIO_SYSSPACE, 0); 361 if (error && bootverbose) 362 printf("mountroot: unable to unlink /dev/dev " 363 "(error %d)\n", error); 364 } 365 366 return (0); 367 } 368 369 /* 370 * Configuration parser. 371 */ 372 373 /* Parser character classes. */ 374 #define CC_WHITESPACE -1 375 #define CC_NONWHITESPACE -2 376 377 /* Parse errors. */ 378 #define PE_EOF -1 379 #define PE_EOL -2 380 381 static __inline int 382 parse_peek(char **conf) 383 { 384 385 return (**conf); 386 } 387 388 static __inline void 389 parse_poke(char **conf, int c) 390 { 391 392 **conf = c; 393 } 394 395 static __inline void 396 parse_advance(char **conf) 397 { 398 399 (*conf)++; 400 } 401 402 static int 403 parse_skipto(char **conf, int mc) 404 { 405 int c, match; 406 407 while (1) { 408 c = parse_peek(conf); 409 if (c == 0) 410 return (PE_EOF); 411 switch (mc) { 412 case CC_WHITESPACE: 413 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 414 break; 415 case CC_NONWHITESPACE: 416 if (c == '\n') 417 return (PE_EOL); 418 match = (c != ' ' && c != '\t') ? 1 : 0; 419 break; 420 default: 421 match = (c == mc) ? 1 : 0; 422 break; 423 } 424 if (match) 425 break; 426 parse_advance(conf); 427 } 428 return (0); 429 } 430 431 static int 432 parse_token(char **conf, char **tok) 433 { 434 char *p; 435 size_t len; 436 int error; 437 438 *tok = NULL; 439 error = parse_skipto(conf, CC_NONWHITESPACE); 440 if (error) 441 return (error); 442 p = *conf; 443 error = parse_skipto(conf, CC_WHITESPACE); 444 len = *conf - p; 445 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 446 bcopy(p, *tok, len); 447 return (0); 448 } 449 450 static void 451 parse_dir_ask_printenv(const char *var) 452 { 453 char *val; 454 455 val = kern_getenv(var); 456 if (val != NULL) { 457 printf(" %s=%s\n", var, val); 458 freeenv(val); 459 } 460 } 461 462 static int 463 parse_dir_ask(char **conf) 464 { 465 char name[80]; 466 char *mnt; 467 int error; 468 469 printf("\nLoader variables:\n"); 470 parse_dir_ask_printenv("vfs.root.mountfrom"); 471 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 472 473 printf("\nManual root filesystem specification:\n"); 474 printf(" <fstype>:<device> [options]\n"); 475 printf(" Mount <device> using filesystem <fstype>\n"); 476 printf(" and with the specified (optional) option list.\n"); 477 printf("\n"); 478 printf(" eg. ufs:/dev/da0s1a\n"); 479 printf(" zfs:tank\n"); 480 printf(" cd9660:/dev/acd0 ro\n"); 481 printf(" (which is equivalent to: "); 482 printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 483 printf("\n"); 484 printf(" ? List valid disk boot devices\n"); 485 printf(" . Yield 1 second (for background tasks)\n"); 486 printf(" <empty line> Abort manual input\n"); 487 488 do { 489 error = EINVAL; 490 printf("\nmountroot> "); 491 cngets(name, sizeof(name), GETS_ECHO); 492 if (name[0] == '\0') 493 break; 494 if (name[0] == '?' && name[1] == '\0') { 495 printf("\nList of GEOM managed disk devices:\n "); 496 g_dev_print(); 497 continue; 498 } 499 if (name[0] == '.' && name[1] == '\0') { 500 pause("rmask", hz); 501 continue; 502 } 503 mnt = name; 504 error = parse_mount(&mnt); 505 if (error == -1) 506 printf("Invalid file system specification.\n"); 507 } while (error != 0); 508 509 return (error); 510 } 511 512 static int 513 parse_dir_md(char **conf) 514 { 515 struct stat sb; 516 struct thread *td; 517 struct md_ioctl *mdio; 518 char *path, *tok; 519 int error, fd, len; 520 521 td = curthread; 522 523 error = parse_token(conf, &tok); 524 if (error) 525 return (error); 526 527 len = strlen(tok); 528 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 529 path = (void *)(mdio + 1); 530 bcopy(tok, path, len); 531 free(tok, M_TEMP); 532 533 /* Get file status. */ 534 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 535 if (error) 536 goto out; 537 538 /* Open /dev/mdctl so that we can attach/detach. */ 539 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 540 O_RDWR, 0); 541 if (error) 542 goto out; 543 544 fd = td->td_retval[0]; 545 mdio->md_version = MDIOVERSION; 546 mdio->md_type = MD_VNODE; 547 548 if (root_mount_mddev != -1) { 549 mdio->md_unit = root_mount_mddev; 550 DROP_GIANT(); 551 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 552 PICKUP_GIANT(); 553 /* Ignore errors. We don't care. */ 554 root_mount_mddev = -1; 555 } 556 557 mdio->md_file = (void *)(mdio + 1); 558 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 559 mdio->md_mediasize = sb.st_size; 560 mdio->md_unit = 0; 561 DROP_GIANT(); 562 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 563 PICKUP_GIANT(); 564 if (error) 565 goto out; 566 567 if (mdio->md_unit > 9) { 568 printf("rootmount: too many md units\n"); 569 mdio->md_file = NULL; 570 mdio->md_options = 0; 571 mdio->md_mediasize = 0; 572 DROP_GIANT(); 573 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 574 PICKUP_GIANT(); 575 /* Ignore errors. We don't care. */ 576 error = ERANGE; 577 goto out; 578 } 579 580 root_mount_mddev = mdio->md_unit; 581 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 582 583 error = kern_close(td, fd); 584 585 out: 586 free(mdio, M_TEMP); 587 return (error); 588 } 589 590 static int 591 parse_dir_onfail(char **conf) 592 { 593 char *action; 594 int error; 595 596 error = parse_token(conf, &action); 597 if (error) 598 return (error); 599 600 if (!strcmp(action, "continue")) 601 root_mount_onfail = A_CONTINUE; 602 else if (!strcmp(action, "panic")) 603 root_mount_onfail = A_PANIC; 604 else if (!strcmp(action, "reboot")) 605 root_mount_onfail = A_REBOOT; 606 else if (!strcmp(action, "retry")) 607 root_mount_onfail = A_RETRY; 608 else { 609 printf("rootmount: %s: unknown action\n", action); 610 error = EINVAL; 611 } 612 613 free(action, M_TEMP); 614 return (0); 615 } 616 617 static int 618 parse_dir_timeout(char **conf) 619 { 620 char *tok, *endtok; 621 long secs; 622 int error; 623 624 error = parse_token(conf, &tok); 625 if (error) 626 return (error); 627 628 secs = strtol(tok, &endtok, 0); 629 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 630 if (!error) 631 root_mount_timeout = secs; 632 free(tok, M_TEMP); 633 return (error); 634 } 635 636 static int 637 parse_directive(char **conf) 638 { 639 char *dir; 640 int error; 641 642 error = parse_token(conf, &dir); 643 if (error) 644 return (error); 645 646 if (strcmp(dir, ".ask") == 0) 647 error = parse_dir_ask(conf); 648 else if (strcmp(dir, ".md") == 0) 649 error = parse_dir_md(conf); 650 else if (strcmp(dir, ".onfail") == 0) 651 error = parse_dir_onfail(conf); 652 else if (strcmp(dir, ".timeout") == 0) 653 error = parse_dir_timeout(conf); 654 else { 655 printf("mountroot: invalid directive `%s'\n", dir); 656 /* Ignore the rest of the line. */ 657 (void)parse_skipto(conf, '\n'); 658 error = EINVAL; 659 } 660 free(dir, M_TEMP); 661 return (error); 662 } 663 664 static int 665 parse_mount_dev_present(const char *dev) 666 { 667 struct nameidata nd; 668 int error; 669 670 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 671 error = namei(&nd); 672 if (!error) 673 vput(nd.ni_vp); 674 NDFREE(&nd, NDF_ONLY_PNBUF); 675 return (error != 0) ? 0 : 1; 676 } 677 678 #define ERRMSGL 255 679 static int 680 parse_mount(char **conf) 681 { 682 char *errmsg; 683 struct mntarg *ma; 684 char *dev, *fs, *opts, *tok; 685 int delay, error, timeout; 686 687 error = parse_token(conf, &tok); 688 if (error) 689 return (error); 690 fs = tok; 691 error = parse_skipto(&tok, ':'); 692 if (error) { 693 free(fs, M_TEMP); 694 return (error); 695 } 696 parse_poke(&tok, '\0'); 697 parse_advance(&tok); 698 dev = tok; 699 700 if (root_mount_mddev != -1) { 701 /* Handle substitution for the md unit number. */ 702 tok = strstr(dev, "md#"); 703 if (tok != NULL) 704 tok[2] = '0' + root_mount_mddev; 705 } 706 707 /* Parse options. */ 708 error = parse_token(conf, &tok); 709 opts = (error == 0) ? tok : NULL; 710 711 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 712 (opts != NULL) ? opts : ""); 713 714 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 715 716 if (vfs_byname(fs) == NULL) { 717 strlcpy(errmsg, "unknown file system", ERRMSGL); 718 error = ENOENT; 719 goto out; 720 } 721 722 if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 723 dev[0] != '\0' && !parse_mount_dev_present(dev)) { 724 printf("mountroot: waiting for device %s ...\n", dev); 725 delay = hz / 10; 726 timeout = root_mount_timeout * hz; 727 do { 728 pause("rmdev", delay); 729 timeout -= delay; 730 } while (timeout > 0 && !parse_mount_dev_present(dev)); 731 if (timeout <= 0) { 732 error = ENODEV; 733 goto out; 734 } 735 } 736 737 ma = NULL; 738 ma = mount_arg(ma, "fstype", fs, -1); 739 ma = mount_arg(ma, "fspath", "/", -1); 740 ma = mount_arg(ma, "from", dev, -1); 741 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 742 ma = mount_arg(ma, "ro", NULL, 0); 743 ma = parse_mountroot_options(ma, opts); 744 error = kernel_mount(ma, MNT_ROOTFS); 745 746 out: 747 if (error) { 748 printf("Mounting from %s:%s failed with error %d", 749 fs, dev, error); 750 if (errmsg[0] != '\0') 751 printf(": %s", errmsg); 752 printf(".\n"); 753 } 754 free(fs, M_TEMP); 755 free(errmsg, M_TEMP); 756 if (opts != NULL) 757 free(opts, M_TEMP); 758 /* kernel_mount can return -1 on error. */ 759 return ((error < 0) ? EDOOFUS : error); 760 } 761 #undef ERRMSGL 762 763 static int 764 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 765 { 766 struct mount *mp; 767 char *conf; 768 int error; 769 770 root_mount_mddev = -1; 771 772 retry: 773 conf = sbuf_data(sb); 774 mp = TAILQ_NEXT(mpdevfs, mnt_list); 775 error = (mp == NULL) ? 0 : EDOOFUS; 776 root_mount_onfail = A_CONTINUE; 777 while (mp == NULL) { 778 error = parse_skipto(&conf, CC_NONWHITESPACE); 779 if (error == PE_EOL) { 780 parse_advance(&conf); 781 continue; 782 } 783 if (error < 0) 784 break; 785 switch (parse_peek(&conf)) { 786 case '#': 787 error = parse_skipto(&conf, '\n'); 788 break; 789 case '.': 790 error = parse_directive(&conf); 791 break; 792 default: 793 error = parse_mount(&conf); 794 if (error == -1) { 795 printf("mountroot: invalid file system " 796 "specification.\n"); 797 error = 0; 798 } 799 break; 800 } 801 if (error < 0) 802 break; 803 /* Ignore any trailing garbage on the line. */ 804 if (parse_peek(&conf) != '\n') { 805 printf("mountroot: advancing to next directive...\n"); 806 (void)parse_skipto(&conf, '\n'); 807 } 808 mp = TAILQ_NEXT(mpdevfs, mnt_list); 809 } 810 if (mp != NULL) 811 return (0); 812 813 /* 814 * We failed to mount (a new) root. 815 */ 816 switch (root_mount_onfail) { 817 case A_CONTINUE: 818 break; 819 case A_PANIC: 820 panic("mountroot: unable to (re-)mount root."); 821 /* NOTREACHED */ 822 case A_RETRY: 823 goto retry; 824 case A_REBOOT: 825 kern_reboot(RB_NOSYNC); 826 /* NOTREACHED */ 827 } 828 829 return (error); 830 } 831 832 static void 833 vfs_mountroot_conf0(struct sbuf *sb) 834 { 835 char *s, *tok, *mnt, *opt; 836 int error; 837 838 sbuf_printf(sb, ".onfail panic\n"); 839 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 840 if (boothowto & RB_ASKNAME) 841 sbuf_printf(sb, ".ask\n"); 842 #ifdef ROOTDEVNAME 843 if (boothowto & RB_DFLTROOT) 844 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 845 #endif 846 if (boothowto & RB_CDROM) { 847 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 848 sbuf_printf(sb, ".timeout 0\n"); 849 sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 850 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 851 } 852 s = kern_getenv("vfs.root.mountfrom"); 853 if (s != NULL) { 854 opt = kern_getenv("vfs.root.mountfrom.options"); 855 tok = s; 856 error = parse_token(&tok, &mnt); 857 while (!error) { 858 sbuf_printf(sb, "%s %s\n", mnt, 859 (opt != NULL) ? opt : ""); 860 free(mnt, M_TEMP); 861 error = parse_token(&tok, &mnt); 862 } 863 if (opt != NULL) 864 freeenv(opt); 865 freeenv(s); 866 } 867 if (rootdevnames[0] != NULL) 868 sbuf_printf(sb, "%s\n", rootdevnames[0]); 869 if (rootdevnames[1] != NULL) 870 sbuf_printf(sb, "%s\n", rootdevnames[1]); 871 #ifdef ROOTDEVNAME 872 if (!(boothowto & RB_DFLTROOT)) 873 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 874 #endif 875 if (!(boothowto & RB_ASKNAME)) 876 sbuf_printf(sb, ".ask\n"); 877 } 878 879 static int 880 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 881 { 882 static char buf[128]; 883 struct nameidata nd; 884 off_t ofs; 885 ssize_t resid; 886 int error, flags, len; 887 888 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 889 flags = FREAD; 890 error = vn_open(&nd, &flags, 0, NULL); 891 if (error) 892 return (error); 893 894 NDFREE(&nd, NDF_ONLY_PNBUF); 895 ofs = 0; 896 len = sizeof(buf) - 1; 897 while (1) { 898 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 899 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 900 NOCRED, &resid, td); 901 if (error) 902 break; 903 if (resid == len) 904 break; 905 buf[len - resid] = 0; 906 sbuf_printf(sb, "%s", buf); 907 ofs += len - resid; 908 } 909 910 VOP_UNLOCK(nd.ni_vp, 0); 911 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 912 return (error); 913 } 914 915 static void 916 vfs_mountroot_wait(void) 917 { 918 struct root_hold_token *h; 919 struct timeval lastfail; 920 int curfail; 921 922 curfail = 0; 923 while (1) { 924 DROP_GIANT(); 925 g_waitidle(); 926 PICKUP_GIANT(); 927 mtx_lock(&root_holds_mtx); 928 if (LIST_EMPTY(&root_holds)) { 929 mtx_unlock(&root_holds_mtx); 930 break; 931 } 932 if (ppsratecheck(&lastfail, &curfail, 1)) { 933 printf("Root mount waiting for:"); 934 LIST_FOREACH(h, &root_holds, list) 935 printf(" %s", h->who); 936 printf("\n"); 937 } 938 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 939 hz); 940 } 941 } 942 943 void 944 vfs_mountroot(void) 945 { 946 struct mount *mp; 947 struct sbuf *sb; 948 struct thread *td; 949 time_t timebase; 950 int error; 951 952 td = curthread; 953 954 vfs_mountroot_wait(); 955 956 sb = sbuf_new_auto(); 957 vfs_mountroot_conf0(sb); 958 sbuf_finish(sb); 959 960 error = vfs_mountroot_devfs(td, &mp); 961 while (!error) { 962 error = vfs_mountroot_parse(sb, mp); 963 if (!error) { 964 error = vfs_mountroot_shuffle(td, mp); 965 if (!error) { 966 sbuf_clear(sb); 967 error = vfs_mountroot_readconf(td, sb); 968 sbuf_finish(sb); 969 } 970 } 971 } 972 973 sbuf_delete(sb); 974 975 /* 976 * Iterate over all currently mounted file systems and use 977 * the time stamp found to check and/or initialize the RTC. 978 * Call inittodr() only once and pass it the largest of the 979 * timestamps we encounter. 980 */ 981 timebase = 0; 982 mtx_lock(&mountlist_mtx); 983 mp = TAILQ_FIRST(&mountlist); 984 while (mp != NULL) { 985 if (mp->mnt_time > timebase) 986 timebase = mp->mnt_time; 987 mp = TAILQ_NEXT(mp, mnt_list); 988 } 989 mtx_unlock(&mountlist_mtx); 990 inittodr(timebase); 991 992 /* Keep prison0's root in sync with the global rootvnode. */ 993 mtx_lock(&prison0.pr_mtx); 994 prison0.pr_root = rootvnode; 995 vref(prison0.pr_root); 996 mtx_unlock(&prison0.pr_mtx); 997 998 mtx_lock(&root_holds_mtx); 999 atomic_store_rel_int(&root_mount_complete, 1); 1000 wakeup(&root_mount_complete); 1001 mtx_unlock(&root_holds_mtx); 1002 1003 EVENTHANDLER_INVOKE(mountroot); 1004 } 1005 1006 static struct mntarg * 1007 parse_mountroot_options(struct mntarg *ma, const char *options) 1008 { 1009 char *p; 1010 char *name, *name_arg; 1011 char *val, *val_arg; 1012 char *opts; 1013 1014 if (options == NULL || options[0] == '\0') 1015 return (ma); 1016 1017 p = opts = strdup(options, M_MOUNT); 1018 if (opts == NULL) { 1019 return (ma); 1020 } 1021 1022 while((name = strsep(&p, ",")) != NULL) { 1023 if (name[0] == '\0') 1024 break; 1025 1026 val = strchr(name, '='); 1027 if (val != NULL) { 1028 *val = '\0'; 1029 ++val; 1030 } 1031 if( strcmp(name, "rw") == 0 || 1032 strcmp(name, "noro") == 0) { 1033 /* 1034 * The first time we mount the root file system, 1035 * we need to mount 'ro', so We need to ignore 1036 * 'rw' and 'noro' mount options. 1037 */ 1038 continue; 1039 } 1040 name_arg = strdup(name, M_MOUNT); 1041 val_arg = NULL; 1042 if (val != NULL) 1043 val_arg = strdup(val, M_MOUNT); 1044 1045 ma = mount_arg(ma, name_arg, val_arg, 1046 (val_arg != NULL ? -1 : 0)); 1047 } 1048 free(opts, M_MOUNT); 1049 return (ma); 1050 } 1051