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 static void 170 set_rootvnode(void) 171 { 172 struct proc *p; 173 174 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 175 panic("Cannot find root vnode"); 176 177 VOP_UNLOCK(rootvnode, 0); 178 179 p = curthread->td_proc; 180 FILEDESC_XLOCK(p->p_fd); 181 182 if (p->p_fd->fd_cdir != NULL) 183 vrele(p->p_fd->fd_cdir); 184 p->p_fd->fd_cdir = rootvnode; 185 VREF(rootvnode); 186 187 if (p->p_fd->fd_rdir != NULL) 188 vrele(p->p_fd->fd_rdir); 189 p->p_fd->fd_rdir = rootvnode; 190 VREF(rootvnode); 191 192 FILEDESC_XUNLOCK(p->p_fd); 193 } 194 195 static int 196 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 197 { 198 struct vfsoptlist *opts; 199 struct vfsconf *vfsp; 200 struct mount *mp; 201 int error; 202 203 *mpp = NULL; 204 205 if (rootdevmp != NULL) { 206 /* 207 * Already have /dev; this happens during rerooting. 208 */ 209 error = vfs_busy(rootdevmp, 0); 210 if (error != 0) 211 return (error); 212 *mpp = rootdevmp; 213 } else { 214 vfsp = vfs_byname("devfs"); 215 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 216 if (vfsp == NULL) 217 return (ENOENT); 218 219 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 220 221 error = VFS_MOUNT(mp); 222 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 223 if (error) 224 return (error); 225 226 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 227 TAILQ_INIT(opts); 228 mp->mnt_opt = opts; 229 230 mtx_lock(&mountlist_mtx); 231 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 232 mtx_unlock(&mountlist_mtx); 233 234 *mpp = mp; 235 rootdevmp = mp; 236 } 237 238 set_rootvnode(); 239 240 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 241 if (error) 242 printf("kern_symlink /dev -> / returns %d\n", error); 243 244 return (error); 245 } 246 247 static void 248 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 249 { 250 struct nameidata nd; 251 struct mount *mporoot, *mpnroot; 252 struct vnode *vp, *vporoot, *vpdevfs; 253 char *fspath; 254 int error; 255 256 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 257 258 /* Shuffle the mountlist. */ 259 mtx_lock(&mountlist_mtx); 260 mporoot = TAILQ_FIRST(&mountlist); 261 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 262 if (mporoot != mpdevfs) { 263 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 264 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 265 } 266 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 267 mtx_unlock(&mountlist_mtx); 268 269 cache_purgevfs(mporoot); 270 if (mporoot != mpdevfs) 271 cache_purgevfs(mpdevfs); 272 273 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 274 275 VI_LOCK(vporoot); 276 vporoot->v_iflag &= ~VI_MOUNT; 277 VI_UNLOCK(vporoot); 278 vporoot->v_mountedhere = NULL; 279 mporoot->mnt_flag &= ~MNT_ROOTFS; 280 mporoot->mnt_vnodecovered = NULL; 281 vput(vporoot); 282 283 /* Set up the new rootvnode, and purge the cache */ 284 mpnroot->mnt_vnodecovered = NULL; 285 set_rootvnode(); 286 cache_purgevfs(rootvnode->v_mount); 287 288 if (mporoot != mpdevfs) { 289 /* Remount old root under /.mount or /mnt */ 290 fspath = "/.mount"; 291 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 292 fspath, td); 293 error = namei(&nd); 294 if (error) { 295 NDFREE(&nd, NDF_ONLY_PNBUF); 296 fspath = "/mnt"; 297 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 298 fspath, td); 299 error = namei(&nd); 300 } 301 if (!error) { 302 vp = nd.ni_vp; 303 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 304 if (!error) 305 error = vinvalbuf(vp, V_SAVE, 0, 0); 306 if (!error) { 307 cache_purge(vp); 308 mporoot->mnt_vnodecovered = vp; 309 vp->v_mountedhere = mporoot; 310 strlcpy(mporoot->mnt_stat.f_mntonname, 311 fspath, MNAMELEN); 312 VOP_UNLOCK(vp, 0); 313 } else 314 vput(vp); 315 } 316 NDFREE(&nd, NDF_ONLY_PNBUF); 317 318 if (error && bootverbose) 319 printf("mountroot: unable to remount previous root " 320 "under /.mount or /mnt (error %d).\n", error); 321 } 322 323 /* Remount devfs under /dev */ 324 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 325 error = namei(&nd); 326 if (!error) { 327 vp = nd.ni_vp; 328 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 329 if (!error) 330 error = vinvalbuf(vp, V_SAVE, 0, 0); 331 if (!error) { 332 vpdevfs = mpdevfs->mnt_vnodecovered; 333 if (vpdevfs != NULL) { 334 cache_purge(vpdevfs); 335 vpdevfs->v_mountedhere = NULL; 336 vrele(vpdevfs); 337 } 338 mpdevfs->mnt_vnodecovered = vp; 339 vp->v_mountedhere = mpdevfs; 340 VOP_UNLOCK(vp, 0); 341 } else 342 vput(vp); 343 } 344 if (error && bootverbose) 345 printf("mountroot: unable to remount devfs under /dev " 346 "(error %d).\n", error); 347 NDFREE(&nd, NDF_ONLY_PNBUF); 348 349 if (mporoot == mpdevfs) { 350 vfs_unbusy(mpdevfs); 351 /* Unlink the no longer needed /dev/dev -> / symlink */ 352 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 353 UIO_SYSSPACE, 0); 354 if (error && bootverbose) 355 printf("mountroot: unable to unlink /dev/dev " 356 "(error %d)\n", error); 357 } 358 } 359 360 /* 361 * Configuration parser. 362 */ 363 364 /* Parser character classes. */ 365 #define CC_WHITESPACE -1 366 #define CC_NONWHITESPACE -2 367 368 /* Parse errors. */ 369 #define PE_EOF -1 370 #define PE_EOL -2 371 372 static __inline int 373 parse_peek(char **conf) 374 { 375 376 return (**conf); 377 } 378 379 static __inline void 380 parse_poke(char **conf, int c) 381 { 382 383 **conf = c; 384 } 385 386 static __inline void 387 parse_advance(char **conf) 388 { 389 390 (*conf)++; 391 } 392 393 static int 394 parse_skipto(char **conf, int mc) 395 { 396 int c, match; 397 398 while (1) { 399 c = parse_peek(conf); 400 if (c == 0) 401 return (PE_EOF); 402 switch (mc) { 403 case CC_WHITESPACE: 404 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 405 break; 406 case CC_NONWHITESPACE: 407 if (c == '\n') 408 return (PE_EOL); 409 match = (c != ' ' && c != '\t') ? 1 : 0; 410 break; 411 default: 412 match = (c == mc) ? 1 : 0; 413 break; 414 } 415 if (match) 416 break; 417 parse_advance(conf); 418 } 419 return (0); 420 } 421 422 static int 423 parse_token(char **conf, char **tok) 424 { 425 char *p; 426 size_t len; 427 int error; 428 429 *tok = NULL; 430 error = parse_skipto(conf, CC_NONWHITESPACE); 431 if (error) 432 return (error); 433 p = *conf; 434 error = parse_skipto(conf, CC_WHITESPACE); 435 len = *conf - p; 436 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 437 bcopy(p, *tok, len); 438 return (0); 439 } 440 441 static void 442 parse_dir_ask_printenv(const char *var) 443 { 444 char *val; 445 446 val = kern_getenv(var); 447 if (val != NULL) { 448 printf(" %s=%s\n", var, val); 449 freeenv(val); 450 } 451 } 452 453 static int 454 parse_dir_ask(char **conf) 455 { 456 char name[80]; 457 char *mnt; 458 int error; 459 460 printf("\nLoader variables:\n"); 461 parse_dir_ask_printenv("vfs.root.mountfrom"); 462 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 463 464 printf("\nManual root filesystem specification:\n"); 465 printf(" <fstype>:<device> [options]\n"); 466 printf(" Mount <device> using filesystem <fstype>\n"); 467 printf(" and with the specified (optional) option list.\n"); 468 printf("\n"); 469 printf(" eg. ufs:/dev/da0s1a\n"); 470 printf(" zfs:tank\n"); 471 printf(" cd9660:/dev/acd0 ro\n"); 472 printf(" (which is equivalent to: "); 473 printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 474 printf("\n"); 475 printf(" ? List valid disk boot devices\n"); 476 printf(" . Yield 1 second (for background tasks)\n"); 477 printf(" <empty line> Abort manual input\n"); 478 479 do { 480 error = EINVAL; 481 printf("\nmountroot> "); 482 cngets(name, sizeof(name), GETS_ECHO); 483 if (name[0] == '\0') 484 break; 485 if (name[0] == '?' && name[1] == '\0') { 486 printf("\nList of GEOM managed disk devices:\n "); 487 g_dev_print(); 488 continue; 489 } 490 if (name[0] == '.' && name[1] == '\0') { 491 pause("rmask", hz); 492 continue; 493 } 494 mnt = name; 495 error = parse_mount(&mnt); 496 if (error == -1) 497 printf("Invalid file system specification.\n"); 498 } while (error != 0); 499 500 return (error); 501 } 502 503 static int 504 parse_dir_md(char **conf) 505 { 506 struct stat sb; 507 struct thread *td; 508 struct md_ioctl *mdio; 509 char *path, *tok; 510 int error, fd, len; 511 512 td = curthread; 513 514 error = parse_token(conf, &tok); 515 if (error) 516 return (error); 517 518 len = strlen(tok); 519 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 520 path = (void *)(mdio + 1); 521 bcopy(tok, path, len); 522 free(tok, M_TEMP); 523 524 /* Get file status. */ 525 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 526 if (error) 527 goto out; 528 529 /* Open /dev/mdctl so that we can attach/detach. */ 530 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 531 O_RDWR, 0); 532 if (error) 533 goto out; 534 535 fd = td->td_retval[0]; 536 mdio->md_version = MDIOVERSION; 537 mdio->md_type = MD_VNODE; 538 539 if (root_mount_mddev != -1) { 540 mdio->md_unit = root_mount_mddev; 541 DROP_GIANT(); 542 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 543 PICKUP_GIANT(); 544 /* Ignore errors. We don't care. */ 545 root_mount_mddev = -1; 546 } 547 548 mdio->md_file = (void *)(mdio + 1); 549 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 550 mdio->md_mediasize = sb.st_size; 551 mdio->md_unit = 0; 552 DROP_GIANT(); 553 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 554 PICKUP_GIANT(); 555 if (error) 556 goto out; 557 558 if (mdio->md_unit > 9) { 559 printf("rootmount: too many md units\n"); 560 mdio->md_file = NULL; 561 mdio->md_options = 0; 562 mdio->md_mediasize = 0; 563 DROP_GIANT(); 564 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 565 PICKUP_GIANT(); 566 /* Ignore errors. We don't care. */ 567 error = ERANGE; 568 goto out; 569 } 570 571 root_mount_mddev = mdio->md_unit; 572 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 573 574 error = kern_close(td, fd); 575 576 out: 577 free(mdio, M_TEMP); 578 return (error); 579 } 580 581 static int 582 parse_dir_onfail(char **conf) 583 { 584 char *action; 585 int error; 586 587 error = parse_token(conf, &action); 588 if (error) 589 return (error); 590 591 if (!strcmp(action, "continue")) 592 root_mount_onfail = A_CONTINUE; 593 else if (!strcmp(action, "panic")) 594 root_mount_onfail = A_PANIC; 595 else if (!strcmp(action, "reboot")) 596 root_mount_onfail = A_REBOOT; 597 else if (!strcmp(action, "retry")) 598 root_mount_onfail = A_RETRY; 599 else { 600 printf("rootmount: %s: unknown action\n", action); 601 error = EINVAL; 602 } 603 604 free(action, M_TEMP); 605 return (0); 606 } 607 608 static int 609 parse_dir_timeout(char **conf) 610 { 611 char *tok, *endtok; 612 long secs; 613 int error; 614 615 error = parse_token(conf, &tok); 616 if (error) 617 return (error); 618 619 secs = strtol(tok, &endtok, 0); 620 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 621 if (!error) 622 root_mount_timeout = secs; 623 free(tok, M_TEMP); 624 return (error); 625 } 626 627 static int 628 parse_directive(char **conf) 629 { 630 char *dir; 631 int error; 632 633 error = parse_token(conf, &dir); 634 if (error) 635 return (error); 636 637 if (strcmp(dir, ".ask") == 0) 638 error = parse_dir_ask(conf); 639 else if (strcmp(dir, ".md") == 0) 640 error = parse_dir_md(conf); 641 else if (strcmp(dir, ".onfail") == 0) 642 error = parse_dir_onfail(conf); 643 else if (strcmp(dir, ".timeout") == 0) 644 error = parse_dir_timeout(conf); 645 else { 646 printf("mountroot: invalid directive `%s'\n", dir); 647 /* Ignore the rest of the line. */ 648 (void)parse_skipto(conf, '\n'); 649 error = EINVAL; 650 } 651 free(dir, M_TEMP); 652 return (error); 653 } 654 655 static int 656 parse_mount_dev_present(const char *dev) 657 { 658 struct nameidata nd; 659 int error; 660 661 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 662 error = namei(&nd); 663 if (!error) 664 vput(nd.ni_vp); 665 NDFREE(&nd, NDF_ONLY_PNBUF); 666 return (error != 0) ? 0 : 1; 667 } 668 669 #define ERRMSGL 255 670 static int 671 parse_mount(char **conf) 672 { 673 char *errmsg; 674 struct mntarg *ma; 675 char *dev, *fs, *opts, *tok; 676 int delay, error, timeout; 677 678 error = parse_token(conf, &tok); 679 if (error) 680 return (error); 681 fs = tok; 682 error = parse_skipto(&tok, ':'); 683 if (error) { 684 free(fs, M_TEMP); 685 return (error); 686 } 687 parse_poke(&tok, '\0'); 688 parse_advance(&tok); 689 dev = tok; 690 691 if (root_mount_mddev != -1) { 692 /* Handle substitution for the md unit number. */ 693 tok = strstr(dev, "md#"); 694 if (tok != NULL) 695 tok[2] = '0' + root_mount_mddev; 696 } 697 698 /* Parse options. */ 699 error = parse_token(conf, &tok); 700 opts = (error == 0) ? tok : NULL; 701 702 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 703 (opts != NULL) ? opts : ""); 704 705 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 706 707 if (vfs_byname(fs) == NULL) { 708 strlcpy(errmsg, "unknown file system", ERRMSGL); 709 error = ENOENT; 710 goto out; 711 } 712 713 if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 714 dev[0] != '\0' && !parse_mount_dev_present(dev)) { 715 printf("mountroot: waiting for device %s ...\n", dev); 716 delay = hz / 10; 717 timeout = root_mount_timeout * hz; 718 do { 719 pause("rmdev", delay); 720 timeout -= delay; 721 } while (timeout > 0 && !parse_mount_dev_present(dev)); 722 if (timeout <= 0) { 723 error = ENODEV; 724 goto out; 725 } 726 } 727 728 ma = NULL; 729 ma = mount_arg(ma, "fstype", fs, -1); 730 ma = mount_arg(ma, "fspath", "/", -1); 731 ma = mount_arg(ma, "from", dev, -1); 732 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 733 ma = mount_arg(ma, "ro", NULL, 0); 734 ma = parse_mountroot_options(ma, opts); 735 error = kernel_mount(ma, MNT_ROOTFS); 736 737 out: 738 if (error) { 739 printf("Mounting from %s:%s failed with error %d", 740 fs, dev, error); 741 if (errmsg[0] != '\0') 742 printf(": %s", errmsg); 743 printf(".\n"); 744 } 745 free(fs, M_TEMP); 746 free(errmsg, M_TEMP); 747 if (opts != NULL) 748 free(opts, M_TEMP); 749 /* kernel_mount can return -1 on error. */ 750 return ((error < 0) ? EDOOFUS : error); 751 } 752 #undef ERRMSGL 753 754 static int 755 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 756 { 757 struct mount *mp; 758 char *conf; 759 int error; 760 761 root_mount_mddev = -1; 762 763 retry: 764 conf = sbuf_data(sb); 765 mp = TAILQ_NEXT(mpdevfs, mnt_list); 766 error = (mp == NULL) ? 0 : EDOOFUS; 767 root_mount_onfail = A_CONTINUE; 768 while (mp == NULL) { 769 error = parse_skipto(&conf, CC_NONWHITESPACE); 770 if (error == PE_EOL) { 771 parse_advance(&conf); 772 continue; 773 } 774 if (error < 0) 775 break; 776 switch (parse_peek(&conf)) { 777 case '#': 778 error = parse_skipto(&conf, '\n'); 779 break; 780 case '.': 781 error = parse_directive(&conf); 782 break; 783 default: 784 error = parse_mount(&conf); 785 if (error == -1) { 786 printf("mountroot: invalid file system " 787 "specification.\n"); 788 error = 0; 789 } 790 break; 791 } 792 if (error < 0) 793 break; 794 /* Ignore any trailing garbage on the line. */ 795 if (parse_peek(&conf) != '\n') { 796 printf("mountroot: advancing to next directive...\n"); 797 (void)parse_skipto(&conf, '\n'); 798 } 799 mp = TAILQ_NEXT(mpdevfs, mnt_list); 800 } 801 if (mp != NULL) 802 return (0); 803 804 /* 805 * We failed to mount (a new) root. 806 */ 807 switch (root_mount_onfail) { 808 case A_CONTINUE: 809 break; 810 case A_PANIC: 811 panic("mountroot: unable to (re-)mount root."); 812 /* NOTREACHED */ 813 case A_RETRY: 814 goto retry; 815 case A_REBOOT: 816 kern_reboot(RB_NOSYNC); 817 /* NOTREACHED */ 818 } 819 820 return (error); 821 } 822 823 static void 824 vfs_mountroot_conf0(struct sbuf *sb) 825 { 826 char *s, *tok, *mnt, *opt; 827 int error; 828 829 sbuf_printf(sb, ".onfail panic\n"); 830 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 831 if (boothowto & RB_ASKNAME) 832 sbuf_printf(sb, ".ask\n"); 833 #ifdef ROOTDEVNAME 834 if (boothowto & RB_DFLTROOT) 835 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 836 #endif 837 if (boothowto & RB_CDROM) { 838 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 839 sbuf_printf(sb, ".timeout 0\n"); 840 sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 841 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 842 } 843 s = kern_getenv("vfs.root.mountfrom"); 844 if (s != NULL) { 845 opt = kern_getenv("vfs.root.mountfrom.options"); 846 tok = s; 847 error = parse_token(&tok, &mnt); 848 while (!error) { 849 sbuf_printf(sb, "%s %s\n", mnt, 850 (opt != NULL) ? opt : ""); 851 free(mnt, M_TEMP); 852 error = parse_token(&tok, &mnt); 853 } 854 if (opt != NULL) 855 freeenv(opt); 856 freeenv(s); 857 } 858 if (rootdevnames[0] != NULL) 859 sbuf_printf(sb, "%s\n", rootdevnames[0]); 860 if (rootdevnames[1] != NULL) 861 sbuf_printf(sb, "%s\n", rootdevnames[1]); 862 #ifdef ROOTDEVNAME 863 if (!(boothowto & RB_DFLTROOT)) 864 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 865 #endif 866 if (!(boothowto & RB_ASKNAME)) 867 sbuf_printf(sb, ".ask\n"); 868 } 869 870 static int 871 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 872 { 873 static char buf[128]; 874 struct nameidata nd; 875 off_t ofs; 876 ssize_t resid; 877 int error, flags, len; 878 879 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 880 flags = FREAD; 881 error = vn_open(&nd, &flags, 0, NULL); 882 if (error) 883 return (error); 884 885 NDFREE(&nd, NDF_ONLY_PNBUF); 886 ofs = 0; 887 len = sizeof(buf) - 1; 888 while (1) { 889 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 890 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 891 NOCRED, &resid, td); 892 if (error) 893 break; 894 if (resid == len) 895 break; 896 buf[len - resid] = 0; 897 sbuf_printf(sb, "%s", buf); 898 ofs += len - resid; 899 } 900 901 VOP_UNLOCK(nd.ni_vp, 0); 902 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 903 return (error); 904 } 905 906 static void 907 vfs_mountroot_wait(void) 908 { 909 struct root_hold_token *h; 910 struct timeval lastfail; 911 int curfail; 912 913 curfail = 0; 914 while (1) { 915 DROP_GIANT(); 916 g_waitidle(); 917 PICKUP_GIANT(); 918 mtx_lock(&root_holds_mtx); 919 if (LIST_EMPTY(&root_holds)) { 920 mtx_unlock(&root_holds_mtx); 921 break; 922 } 923 if (ppsratecheck(&lastfail, &curfail, 1)) { 924 printf("Root mount waiting for:"); 925 LIST_FOREACH(h, &root_holds, list) 926 printf(" %s", h->who); 927 printf("\n"); 928 } 929 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 930 hz); 931 } 932 } 933 934 void 935 vfs_mountroot(void) 936 { 937 struct mount *mp; 938 struct sbuf *sb; 939 struct thread *td; 940 time_t timebase; 941 int error; 942 943 td = curthread; 944 945 vfs_mountroot_wait(); 946 947 sb = sbuf_new_auto(); 948 vfs_mountroot_conf0(sb); 949 sbuf_finish(sb); 950 951 error = vfs_mountroot_devfs(td, &mp); 952 while (!error) { 953 error = vfs_mountroot_parse(sb, mp); 954 if (!error) { 955 vfs_mountroot_shuffle(td, mp); 956 sbuf_clear(sb); 957 error = vfs_mountroot_readconf(td, sb); 958 sbuf_finish(sb); 959 } 960 } 961 962 sbuf_delete(sb); 963 964 /* 965 * Iterate over all currently mounted file systems and use 966 * the time stamp found to check and/or initialize the RTC. 967 * Call inittodr() only once and pass it the largest of the 968 * timestamps we encounter. 969 */ 970 timebase = 0; 971 mtx_lock(&mountlist_mtx); 972 mp = TAILQ_FIRST(&mountlist); 973 while (mp != NULL) { 974 if (mp->mnt_time > timebase) 975 timebase = mp->mnt_time; 976 mp = TAILQ_NEXT(mp, mnt_list); 977 } 978 mtx_unlock(&mountlist_mtx); 979 inittodr(timebase); 980 981 /* Keep prison0's root in sync with the global rootvnode. */ 982 mtx_lock(&prison0.pr_mtx); 983 prison0.pr_root = rootvnode; 984 vref(prison0.pr_root); 985 mtx_unlock(&prison0.pr_mtx); 986 987 mtx_lock(&root_holds_mtx); 988 atomic_store_rel_int(&root_mount_complete, 1); 989 wakeup(&root_mount_complete); 990 mtx_unlock(&root_holds_mtx); 991 992 EVENTHANDLER_INVOKE(mountroot); 993 } 994 995 static struct mntarg * 996 parse_mountroot_options(struct mntarg *ma, const char *options) 997 { 998 char *p; 999 char *name, *name_arg; 1000 char *val, *val_arg; 1001 char *opts; 1002 1003 if (options == NULL || options[0] == '\0') 1004 return (ma); 1005 1006 p = opts = strdup(options, M_MOUNT); 1007 if (opts == NULL) { 1008 return (ma); 1009 } 1010 1011 while((name = strsep(&p, ",")) != NULL) { 1012 if (name[0] == '\0') 1013 break; 1014 1015 val = strchr(name, '='); 1016 if (val != NULL) { 1017 *val = '\0'; 1018 ++val; 1019 } 1020 if( strcmp(name, "rw") == 0 || 1021 strcmp(name, "noro") == 0) { 1022 /* 1023 * The first time we mount the root file system, 1024 * we need to mount 'ro', so We need to ignore 1025 * 'rw' and 'noro' mount options. 1026 */ 1027 continue; 1028 } 1029 name_arg = strdup(name, M_MOUNT); 1030 val_arg = NULL; 1031 if (val != NULL) 1032 val_arg = strdup(val, M_MOUNT); 1033 1034 ma = mount_arg(ma, name_arg, val_arg, 1035 (val_arg != NULL ? -1 : 0)); 1036 } 1037 free(opts, M_MOUNT); 1038 return (ma); 1039 } 1040