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 char *rootdevnames[2] = {NULL, NULL}; 99 100 struct mtx root_holds_mtx; 101 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 102 103 struct root_hold_token { 104 const char *who; 105 LIST_ENTRY(root_hold_token) list; 106 }; 107 108 static LIST_HEAD(, root_hold_token) root_holds = 109 LIST_HEAD_INITIALIZER(root_holds); 110 111 enum action { 112 A_CONTINUE, 113 A_PANIC, 114 A_REBOOT, 115 A_RETRY 116 }; 117 118 static enum action root_mount_onfail = A_CONTINUE; 119 120 static int root_mount_mddev; 121 static int root_mount_complete; 122 123 /* By default wait up to 3 seconds for devices to appear. */ 124 static int root_mount_timeout = 3; 125 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 126 127 struct root_hold_token * 128 root_mount_hold(const char *identifier) 129 { 130 struct root_hold_token *h; 131 132 if (root_mounted()) 133 return (NULL); 134 135 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 136 h->who = identifier; 137 mtx_lock(&root_holds_mtx); 138 LIST_INSERT_HEAD(&root_holds, h, list); 139 mtx_unlock(&root_holds_mtx); 140 return (h); 141 } 142 143 void 144 root_mount_rel(struct root_hold_token *h) 145 { 146 147 if (h == NULL) 148 return; 149 mtx_lock(&root_holds_mtx); 150 LIST_REMOVE(h, list); 151 wakeup(&root_holds); 152 mtx_unlock(&root_holds_mtx); 153 free(h, M_DEVBUF); 154 } 155 156 int 157 root_mounted(void) 158 { 159 160 /* No mutex is acquired here because int stores are atomic. */ 161 return (root_mount_complete); 162 } 163 164 void 165 root_mount_wait(void) 166 { 167 168 /* 169 * Panic on an obvious deadlock - the function can't be called from 170 * a thread which is doing the whole SYSINIT stuff. 171 */ 172 KASSERT(curthread->td_proc->p_pid != 0, 173 ("root_mount_wait: cannot be called from the swapper thread")); 174 mtx_lock(&root_holds_mtx); 175 while (!root_mount_complete) { 176 msleep(&root_mount_complete, &root_holds_mtx, PZERO, "rootwait", 177 hz); 178 } 179 mtx_unlock(&root_holds_mtx); 180 } 181 182 static void 183 set_rootvnode(void) 184 { 185 struct proc *p; 186 187 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 188 panic("Cannot find root vnode"); 189 190 VOP_UNLOCK(rootvnode, 0); 191 192 p = curthread->td_proc; 193 FILEDESC_XLOCK(p->p_fd); 194 195 if (p->p_fd->fd_cdir != NULL) 196 vrele(p->p_fd->fd_cdir); 197 p->p_fd->fd_cdir = rootvnode; 198 VREF(rootvnode); 199 200 if (p->p_fd->fd_rdir != NULL) 201 vrele(p->p_fd->fd_rdir); 202 p->p_fd->fd_rdir = rootvnode; 203 VREF(rootvnode); 204 205 FILEDESC_XUNLOCK(p->p_fd); 206 } 207 208 static int 209 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 210 { 211 struct vfsoptlist *opts; 212 struct vfsconf *vfsp; 213 struct mount *mp; 214 int error; 215 216 *mpp = NULL; 217 218 vfsp = vfs_byname("devfs"); 219 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 220 if (vfsp == NULL) 221 return (ENOENT); 222 223 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 224 225 error = VFS_MOUNT(mp); 226 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 227 if (error) 228 return (error); 229 230 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 231 TAILQ_INIT(opts); 232 mp->mnt_opt = opts; 233 234 mtx_lock(&mountlist_mtx); 235 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 236 mtx_unlock(&mountlist_mtx); 237 238 *mpp = mp; 239 set_rootvnode(); 240 241 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 242 if (error) 243 printf("kern_symlink /dev -> / returns %d\n", error); 244 245 return (error); 246 } 247 248 static int 249 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 250 { 251 struct nameidata nd; 252 struct mount *mporoot, *mpnroot; 253 struct vnode *vp, *vporoot, *vpdevfs; 254 char *fspath; 255 int error; 256 257 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 258 259 /* Shuffle the mountlist. */ 260 mtx_lock(&mountlist_mtx); 261 mporoot = TAILQ_FIRST(&mountlist); 262 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 263 if (mporoot != mpdevfs) { 264 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 265 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 266 } 267 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 268 mtx_unlock(&mountlist_mtx); 269 270 cache_purgevfs(mporoot); 271 if (mporoot != mpdevfs) 272 cache_purgevfs(mpdevfs); 273 274 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 275 276 VI_LOCK(vporoot); 277 vporoot->v_iflag &= ~VI_MOUNT; 278 VI_UNLOCK(vporoot); 279 vporoot->v_mountedhere = NULL; 280 mporoot->mnt_flag &= ~MNT_ROOTFS; 281 mporoot->mnt_vnodecovered = NULL; 282 vput(vporoot); 283 284 /* Set up the new rootvnode, and purge the cache */ 285 mpnroot->mnt_vnodecovered = NULL; 286 set_rootvnode(); 287 cache_purgevfs(rootvnode->v_mount); 288 289 if (mporoot != mpdevfs) { 290 /* Remount old root under /.mount or /mnt */ 291 fspath = "/.mount"; 292 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 293 fspath, td); 294 error = namei(&nd); 295 if (error) { 296 NDFREE(&nd, NDF_ONLY_PNBUF); 297 fspath = "/mnt"; 298 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 299 fspath, td); 300 error = namei(&nd); 301 } 302 if (!error) { 303 vp = nd.ni_vp; 304 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 305 if (!error) 306 error = vinvalbuf(vp, V_SAVE, 0, 0); 307 if (!error) { 308 cache_purge(vp); 309 mporoot->mnt_vnodecovered = vp; 310 vp->v_mountedhere = mporoot; 311 strlcpy(mporoot->mnt_stat.f_mntonname, 312 fspath, MNAMELEN); 313 VOP_UNLOCK(vp, 0); 314 } else 315 vput(vp); 316 } 317 NDFREE(&nd, NDF_ONLY_PNBUF); 318 319 if (error && bootverbose) 320 printf("mountroot: unable to remount previous root " 321 "under /.mount or /mnt (error %d).\n", error); 322 } 323 324 /* Remount devfs under /dev */ 325 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 326 error = namei(&nd); 327 if (!error) { 328 vp = nd.ni_vp; 329 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 330 if (!error) 331 error = vinvalbuf(vp, V_SAVE, 0, 0); 332 if (!error) { 333 vpdevfs = mpdevfs->mnt_vnodecovered; 334 if (vpdevfs != NULL) { 335 cache_purge(vpdevfs); 336 vpdevfs->v_mountedhere = NULL; 337 vrele(vpdevfs); 338 } 339 mpdevfs->mnt_vnodecovered = vp; 340 vp->v_mountedhere = mpdevfs; 341 VOP_UNLOCK(vp, 0); 342 } else 343 vput(vp); 344 } 345 if (error && bootverbose) 346 printf("mountroot: unable to remount devfs under /dev " 347 "(error %d).\n", error); 348 NDFREE(&nd, NDF_ONLY_PNBUF); 349 350 if (mporoot == mpdevfs) { 351 vfs_unbusy(mpdevfs); 352 /* Unlink the no longer needed /dev/dev -> / symlink */ 353 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 354 UIO_SYSSPACE, 0); 355 if (error && bootverbose) 356 printf("mountroot: unable to unlink /dev/dev " 357 "(error %d)\n", error); 358 } 359 360 return (0); 361 } 362 363 /* 364 * Configuration parser. 365 */ 366 367 /* Parser character classes. */ 368 #define CC_WHITESPACE -1 369 #define CC_NONWHITESPACE -2 370 371 /* Parse errors. */ 372 #define PE_EOF -1 373 #define PE_EOL -2 374 375 static __inline int 376 parse_peek(char **conf) 377 { 378 379 return (**conf); 380 } 381 382 static __inline void 383 parse_poke(char **conf, int c) 384 { 385 386 **conf = c; 387 } 388 389 static __inline void 390 parse_advance(char **conf) 391 { 392 393 (*conf)++; 394 } 395 396 static int 397 parse_skipto(char **conf, int mc) 398 { 399 int c, match; 400 401 while (1) { 402 c = parse_peek(conf); 403 if (c == 0) 404 return (PE_EOF); 405 switch (mc) { 406 case CC_WHITESPACE: 407 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 408 break; 409 case CC_NONWHITESPACE: 410 if (c == '\n') 411 return (PE_EOL); 412 match = (c != ' ' && c != '\t') ? 1 : 0; 413 break; 414 default: 415 match = (c == mc) ? 1 : 0; 416 break; 417 } 418 if (match) 419 break; 420 parse_advance(conf); 421 } 422 return (0); 423 } 424 425 static int 426 parse_token(char **conf, char **tok) 427 { 428 char *p; 429 size_t len; 430 int error; 431 432 *tok = NULL; 433 error = parse_skipto(conf, CC_NONWHITESPACE); 434 if (error) 435 return (error); 436 p = *conf; 437 error = parse_skipto(conf, CC_WHITESPACE); 438 len = *conf - p; 439 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 440 bcopy(p, *tok, len); 441 return (0); 442 } 443 444 static void 445 parse_dir_ask_printenv(const char *var) 446 { 447 char *val; 448 449 val = kern_getenv(var); 450 if (val != NULL) { 451 printf(" %s=%s\n", var, val); 452 freeenv(val); 453 } 454 } 455 456 static int 457 parse_dir_ask(char **conf) 458 { 459 char name[80]; 460 char *mnt; 461 int error; 462 463 printf("\nLoader variables:\n"); 464 parse_dir_ask_printenv("vfs.root.mountfrom"); 465 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 466 467 printf("\nManual root filesystem specification:\n"); 468 printf(" <fstype>:<device> [options]\n"); 469 printf(" Mount <device> using filesystem <fstype>\n"); 470 printf(" and with the specified (optional) option list.\n"); 471 printf("\n"); 472 printf(" eg. ufs:/dev/da0s1a\n"); 473 printf(" zfs:tank\n"); 474 printf(" cd9660:/dev/acd0 ro\n"); 475 printf(" (which is equivalent to: "); 476 printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 477 printf("\n"); 478 printf(" ? List valid disk boot devices\n"); 479 printf(" . Yield 1 second (for background tasks)\n"); 480 printf(" <empty line> Abort manual input\n"); 481 482 do { 483 error = EINVAL; 484 printf("\nmountroot> "); 485 cngets(name, sizeof(name), GETS_ECHO); 486 if (name[0] == '\0') 487 break; 488 if (name[0] == '?' && name[1] == '\0') { 489 printf("\nList of GEOM managed disk devices:\n "); 490 g_dev_print(); 491 continue; 492 } 493 if (name[0] == '.' && name[1] == '\0') { 494 pause("rmask", hz); 495 continue; 496 } 497 mnt = name; 498 error = parse_mount(&mnt); 499 if (error == -1) 500 printf("Invalid file system specification.\n"); 501 } while (error != 0); 502 503 return (error); 504 } 505 506 static int 507 parse_dir_md(char **conf) 508 { 509 struct stat sb; 510 struct thread *td; 511 struct md_ioctl *mdio; 512 char *path, *tok; 513 int error, fd, len; 514 515 td = curthread; 516 517 error = parse_token(conf, &tok); 518 if (error) 519 return (error); 520 521 len = strlen(tok); 522 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 523 path = (void *)(mdio + 1); 524 bcopy(tok, path, len); 525 free(tok, M_TEMP); 526 527 /* Get file status. */ 528 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 529 if (error) 530 goto out; 531 532 /* Open /dev/mdctl so that we can attach/detach. */ 533 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 534 O_RDWR, 0); 535 if (error) 536 goto out; 537 538 fd = td->td_retval[0]; 539 mdio->md_version = MDIOVERSION; 540 mdio->md_type = MD_VNODE; 541 542 if (root_mount_mddev != -1) { 543 mdio->md_unit = root_mount_mddev; 544 DROP_GIANT(); 545 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 546 PICKUP_GIANT(); 547 /* Ignore errors. We don't care. */ 548 root_mount_mddev = -1; 549 } 550 551 mdio->md_file = (void *)(mdio + 1); 552 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 553 mdio->md_mediasize = sb.st_size; 554 mdio->md_unit = 0; 555 DROP_GIANT(); 556 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 557 PICKUP_GIANT(); 558 if (error) 559 goto out; 560 561 if (mdio->md_unit > 9) { 562 printf("rootmount: too many md units\n"); 563 mdio->md_file = NULL; 564 mdio->md_options = 0; 565 mdio->md_mediasize = 0; 566 DROP_GIANT(); 567 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 568 PICKUP_GIANT(); 569 /* Ignore errors. We don't care. */ 570 error = ERANGE; 571 goto out; 572 } 573 574 root_mount_mddev = mdio->md_unit; 575 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 576 577 error = kern_close(td, fd); 578 579 out: 580 free(mdio, M_TEMP); 581 return (error); 582 } 583 584 static int 585 parse_dir_onfail(char **conf) 586 { 587 char *action; 588 int error; 589 590 error = parse_token(conf, &action); 591 if (error) 592 return (error); 593 594 if (!strcmp(action, "continue")) 595 root_mount_onfail = A_CONTINUE; 596 else if (!strcmp(action, "panic")) 597 root_mount_onfail = A_PANIC; 598 else if (!strcmp(action, "reboot")) 599 root_mount_onfail = A_REBOOT; 600 else if (!strcmp(action, "retry")) 601 root_mount_onfail = A_RETRY; 602 else { 603 printf("rootmount: %s: unknown action\n", action); 604 error = EINVAL; 605 } 606 607 free(action, M_TEMP); 608 return (0); 609 } 610 611 static int 612 parse_dir_timeout(char **conf) 613 { 614 char *tok, *endtok; 615 long secs; 616 int error; 617 618 error = parse_token(conf, &tok); 619 if (error) 620 return (error); 621 622 secs = strtol(tok, &endtok, 0); 623 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 624 if (!error) 625 root_mount_timeout = secs; 626 free(tok, M_TEMP); 627 return (error); 628 } 629 630 static int 631 parse_directive(char **conf) 632 { 633 char *dir; 634 int error; 635 636 error = parse_token(conf, &dir); 637 if (error) 638 return (error); 639 640 if (strcmp(dir, ".ask") == 0) 641 error = parse_dir_ask(conf); 642 else if (strcmp(dir, ".md") == 0) 643 error = parse_dir_md(conf); 644 else if (strcmp(dir, ".onfail") == 0) 645 error = parse_dir_onfail(conf); 646 else if (strcmp(dir, ".timeout") == 0) 647 error = parse_dir_timeout(conf); 648 else { 649 printf("mountroot: invalid directive `%s'\n", dir); 650 /* Ignore the rest of the line. */ 651 (void)parse_skipto(conf, '\n'); 652 error = EINVAL; 653 } 654 free(dir, M_TEMP); 655 return (error); 656 } 657 658 static int 659 parse_mount_dev_present(const char *dev) 660 { 661 struct nameidata nd; 662 int error; 663 664 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 665 error = namei(&nd); 666 if (!error) 667 vput(nd.ni_vp); 668 NDFREE(&nd, NDF_ONLY_PNBUF); 669 return (error != 0) ? 0 : 1; 670 } 671 672 #define ERRMSGL 255 673 static int 674 parse_mount(char **conf) 675 { 676 char *errmsg; 677 struct mntarg *ma; 678 char *dev, *fs, *opts, *tok; 679 int delay, error, timeout; 680 681 error = parse_token(conf, &tok); 682 if (error) 683 return (error); 684 fs = tok; 685 error = parse_skipto(&tok, ':'); 686 if (error) { 687 free(fs, M_TEMP); 688 return (error); 689 } 690 parse_poke(&tok, '\0'); 691 parse_advance(&tok); 692 dev = tok; 693 694 if (root_mount_mddev != -1) { 695 /* Handle substitution for the md unit number. */ 696 tok = strstr(dev, "md#"); 697 if (tok != NULL) 698 tok[2] = '0' + root_mount_mddev; 699 } 700 701 /* Parse options. */ 702 error = parse_token(conf, &tok); 703 opts = (error == 0) ? tok : NULL; 704 705 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 706 (opts != NULL) ? opts : ""); 707 708 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 709 710 if (vfs_byname(fs) == NULL) { 711 strlcpy(errmsg, "unknown file system", ERRMSGL); 712 error = ENOENT; 713 goto out; 714 } 715 716 if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 717 dev[0] != '\0' && !parse_mount_dev_present(dev)) { 718 printf("mountroot: waiting for device %s ...\n", dev); 719 delay = hz / 10; 720 timeout = root_mount_timeout * hz; 721 do { 722 pause("rmdev", delay); 723 timeout -= delay; 724 } while (timeout > 0 && !parse_mount_dev_present(dev)); 725 if (timeout <= 0) { 726 error = ENODEV; 727 goto out; 728 } 729 } 730 731 ma = NULL; 732 ma = mount_arg(ma, "fstype", fs, -1); 733 ma = mount_arg(ma, "fspath", "/", -1); 734 ma = mount_arg(ma, "from", dev, -1); 735 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 736 ma = mount_arg(ma, "ro", NULL, 0); 737 ma = parse_mountroot_options(ma, opts); 738 error = kernel_mount(ma, MNT_ROOTFS); 739 740 out: 741 if (error) { 742 printf("Mounting from %s:%s failed with error %d", 743 fs, dev, error); 744 if (errmsg[0] != '\0') 745 printf(": %s", errmsg); 746 printf(".\n"); 747 } 748 free(fs, M_TEMP); 749 free(errmsg, M_TEMP); 750 if (opts != NULL) 751 free(opts, M_TEMP); 752 /* kernel_mount can return -1 on error. */ 753 return ((error < 0) ? EDOOFUS : error); 754 } 755 #undef ERRMSGL 756 757 static int 758 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 759 { 760 struct mount *mp; 761 char *conf; 762 int error; 763 764 root_mount_mddev = -1; 765 766 retry: 767 conf = sbuf_data(sb); 768 mp = TAILQ_NEXT(mpdevfs, mnt_list); 769 error = (mp == NULL) ? 0 : EDOOFUS; 770 root_mount_onfail = A_CONTINUE; 771 while (mp == NULL) { 772 error = parse_skipto(&conf, CC_NONWHITESPACE); 773 if (error == PE_EOL) { 774 parse_advance(&conf); 775 continue; 776 } 777 if (error < 0) 778 break; 779 switch (parse_peek(&conf)) { 780 case '#': 781 error = parse_skipto(&conf, '\n'); 782 break; 783 case '.': 784 error = parse_directive(&conf); 785 break; 786 default: 787 error = parse_mount(&conf); 788 break; 789 } 790 if (error < 0) 791 break; 792 /* Ignore any trailing garbage on the line. */ 793 if (parse_peek(&conf) != '\n') { 794 printf("mountroot: advancing to next directive...\n"); 795 (void)parse_skipto(&conf, '\n'); 796 } 797 mp = TAILQ_NEXT(mpdevfs, mnt_list); 798 } 799 if (mp != NULL) 800 return (0); 801 802 /* 803 * We failed to mount (a new) root. 804 */ 805 switch (root_mount_onfail) { 806 case A_CONTINUE: 807 break; 808 case A_PANIC: 809 panic("mountroot: unable to (re-)mount root."); 810 /* NOTREACHED */ 811 case A_RETRY: 812 goto retry; 813 case A_REBOOT: 814 kern_reboot(RB_NOSYNC); 815 /* NOTREACHED */ 816 } 817 818 return (error); 819 } 820 821 static void 822 vfs_mountroot_conf0(struct sbuf *sb) 823 { 824 char *s, *tok, *mnt, *opt; 825 int error; 826 827 sbuf_printf(sb, ".onfail panic\n"); 828 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 829 if (boothowto & RB_ASKNAME) 830 sbuf_printf(sb, ".ask\n"); 831 #ifdef ROOTDEVNAME 832 if (boothowto & RB_DFLTROOT) 833 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 834 #endif 835 if (boothowto & RB_CDROM) { 836 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 837 sbuf_printf(sb, ".timeout 0\n"); 838 sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 839 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 840 } 841 s = kern_getenv("vfs.root.mountfrom"); 842 if (s != NULL) { 843 opt = kern_getenv("vfs.root.mountfrom.options"); 844 tok = s; 845 error = parse_token(&tok, &mnt); 846 while (!error) { 847 sbuf_printf(sb, "%s %s\n", mnt, 848 (opt != NULL) ? opt : ""); 849 free(mnt, M_TEMP); 850 error = parse_token(&tok, &mnt); 851 } 852 if (opt != NULL) 853 freeenv(opt); 854 freeenv(s); 855 } 856 if (rootdevnames[0] != NULL) 857 sbuf_printf(sb, "%s\n", rootdevnames[0]); 858 if (rootdevnames[1] != NULL) 859 sbuf_printf(sb, "%s\n", rootdevnames[1]); 860 #ifdef ROOTDEVNAME 861 if (!(boothowto & RB_DFLTROOT)) 862 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 863 #endif 864 if (!(boothowto & RB_ASKNAME)) 865 sbuf_printf(sb, ".ask\n"); 866 } 867 868 static int 869 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 870 { 871 static char buf[128]; 872 struct nameidata nd; 873 off_t ofs; 874 ssize_t resid; 875 int error, flags, len; 876 877 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 878 flags = FREAD; 879 error = vn_open(&nd, &flags, 0, NULL); 880 if (error) 881 return (error); 882 883 NDFREE(&nd, NDF_ONLY_PNBUF); 884 ofs = 0; 885 len = sizeof(buf) - 1; 886 while (1) { 887 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 888 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 889 NOCRED, &resid, td); 890 if (error) 891 break; 892 if (resid == len) 893 break; 894 buf[len - resid] = 0; 895 sbuf_printf(sb, "%s", buf); 896 ofs += len - resid; 897 } 898 899 VOP_UNLOCK(nd.ni_vp, 0); 900 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 901 return (error); 902 } 903 904 static void 905 vfs_mountroot_wait(void) 906 { 907 struct root_hold_token *h; 908 struct timeval lastfail; 909 int curfail; 910 911 curfail = 0; 912 while (1) { 913 DROP_GIANT(); 914 g_waitidle(); 915 PICKUP_GIANT(); 916 mtx_lock(&root_holds_mtx); 917 if (LIST_EMPTY(&root_holds)) { 918 mtx_unlock(&root_holds_mtx); 919 break; 920 } 921 if (ppsratecheck(&lastfail, &curfail, 1)) { 922 printf("Root mount waiting for:"); 923 LIST_FOREACH(h, &root_holds, list) 924 printf(" %s", h->who); 925 printf("\n"); 926 } 927 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 928 hz); 929 } 930 } 931 932 void 933 vfs_mountroot(void) 934 { 935 struct mount *mp; 936 struct sbuf *sb; 937 struct thread *td; 938 time_t timebase; 939 int error; 940 941 td = curthread; 942 943 vfs_mountroot_wait(); 944 945 sb = sbuf_new_auto(); 946 vfs_mountroot_conf0(sb); 947 sbuf_finish(sb); 948 949 error = vfs_mountroot_devfs(td, &mp); 950 while (!error) { 951 error = vfs_mountroot_parse(sb, mp); 952 if (!error) { 953 error = vfs_mountroot_shuffle(td, mp); 954 if (!error) { 955 sbuf_clear(sb); 956 error = vfs_mountroot_readconf(td, sb); 957 sbuf_finish(sb); 958 } 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