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 if (rootdevmp != NULL) { 224 /* 225 * Already have /dev; this happens during rerooting. 226 */ 227 error = vfs_busy(rootdevmp, 0); 228 if (error != 0) 229 return (error); 230 *mpp = rootdevmp; 231 } else { 232 vfsp = vfs_byname("devfs"); 233 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 234 if (vfsp == NULL) 235 return (ENOENT); 236 237 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 238 239 error = VFS_MOUNT(mp); 240 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 241 if (error) 242 return (error); 243 244 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 245 TAILQ_INIT(opts); 246 mp->mnt_opt = opts; 247 248 mtx_lock(&mountlist_mtx); 249 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 250 mtx_unlock(&mountlist_mtx); 251 252 *mpp = mp; 253 rootdevmp = mp; 254 } 255 256 set_rootvnode(); 257 258 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 259 if (error) 260 printf("kern_symlink /dev -> / returns %d\n", error); 261 262 return (error); 263 } 264 265 static void 266 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 267 { 268 struct nameidata nd; 269 struct mount *mporoot, *mpnroot; 270 struct vnode *vp, *vporoot, *vpdevfs; 271 char *fspath; 272 int error; 273 274 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 275 276 /* Shuffle the mountlist. */ 277 mtx_lock(&mountlist_mtx); 278 mporoot = TAILQ_FIRST(&mountlist); 279 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 280 if (mporoot != mpdevfs) { 281 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 282 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 283 } 284 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 285 mtx_unlock(&mountlist_mtx); 286 287 cache_purgevfs(mporoot); 288 if (mporoot != mpdevfs) 289 cache_purgevfs(mpdevfs); 290 291 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 292 293 VI_LOCK(vporoot); 294 vporoot->v_iflag &= ~VI_MOUNT; 295 VI_UNLOCK(vporoot); 296 vporoot->v_mountedhere = NULL; 297 mporoot->mnt_flag &= ~MNT_ROOTFS; 298 mporoot->mnt_vnodecovered = NULL; 299 vput(vporoot); 300 301 /* Set up the new rootvnode, and purge the cache */ 302 mpnroot->mnt_vnodecovered = NULL; 303 set_rootvnode(); 304 cache_purgevfs(rootvnode->v_mount); 305 306 if (mporoot != mpdevfs) { 307 /* Remount old root under /.mount or /mnt */ 308 fspath = "/.mount"; 309 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 310 fspath, td); 311 error = namei(&nd); 312 if (error) { 313 NDFREE(&nd, NDF_ONLY_PNBUF); 314 fspath = "/mnt"; 315 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 316 fspath, td); 317 error = namei(&nd); 318 } 319 if (!error) { 320 vp = nd.ni_vp; 321 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 322 if (!error) 323 error = vinvalbuf(vp, V_SAVE, 0, 0); 324 if (!error) { 325 cache_purge(vp); 326 mporoot->mnt_vnodecovered = vp; 327 vp->v_mountedhere = mporoot; 328 strlcpy(mporoot->mnt_stat.f_mntonname, 329 fspath, MNAMELEN); 330 VOP_UNLOCK(vp, 0); 331 } else 332 vput(vp); 333 } 334 NDFREE(&nd, NDF_ONLY_PNBUF); 335 336 if (error && bootverbose) 337 printf("mountroot: unable to remount previous root " 338 "under /.mount or /mnt (error %d).\n", error); 339 } 340 341 /* Remount devfs under /dev */ 342 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 343 error = namei(&nd); 344 if (!error) { 345 vp = nd.ni_vp; 346 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 347 if (!error) 348 error = vinvalbuf(vp, V_SAVE, 0, 0); 349 if (!error) { 350 vpdevfs = mpdevfs->mnt_vnodecovered; 351 if (vpdevfs != NULL) { 352 cache_purge(vpdevfs); 353 vpdevfs->v_mountedhere = NULL; 354 vrele(vpdevfs); 355 } 356 mpdevfs->mnt_vnodecovered = vp; 357 vp->v_mountedhere = mpdevfs; 358 VOP_UNLOCK(vp, 0); 359 } else 360 vput(vp); 361 } 362 if (error && bootverbose) 363 printf("mountroot: unable to remount devfs under /dev " 364 "(error %d).\n", error); 365 NDFREE(&nd, NDF_ONLY_PNBUF); 366 367 if (mporoot == mpdevfs) { 368 vfs_unbusy(mpdevfs); 369 /* Unlink the no longer needed /dev/dev -> / symlink */ 370 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 371 UIO_SYSSPACE, 0); 372 if (error && bootverbose) 373 printf("mountroot: unable to unlink /dev/dev " 374 "(error %d)\n", error); 375 } 376 } 377 378 /* 379 * Configuration parser. 380 */ 381 382 /* Parser character classes. */ 383 #define CC_WHITESPACE -1 384 #define CC_NONWHITESPACE -2 385 386 /* Parse errors. */ 387 #define PE_EOF -1 388 #define PE_EOL -2 389 390 static __inline int 391 parse_peek(char **conf) 392 { 393 394 return (**conf); 395 } 396 397 static __inline void 398 parse_poke(char **conf, int c) 399 { 400 401 **conf = c; 402 } 403 404 static __inline void 405 parse_advance(char **conf) 406 { 407 408 (*conf)++; 409 } 410 411 static int 412 parse_skipto(char **conf, int mc) 413 { 414 int c, match; 415 416 while (1) { 417 c = parse_peek(conf); 418 if (c == 0) 419 return (PE_EOF); 420 switch (mc) { 421 case CC_WHITESPACE: 422 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 423 break; 424 case CC_NONWHITESPACE: 425 if (c == '\n') 426 return (PE_EOL); 427 match = (c != ' ' && c != '\t') ? 1 : 0; 428 break; 429 default: 430 match = (c == mc) ? 1 : 0; 431 break; 432 } 433 if (match) 434 break; 435 parse_advance(conf); 436 } 437 return (0); 438 } 439 440 static int 441 parse_token(char **conf, char **tok) 442 { 443 char *p; 444 size_t len; 445 int error; 446 447 *tok = NULL; 448 error = parse_skipto(conf, CC_NONWHITESPACE); 449 if (error) 450 return (error); 451 p = *conf; 452 error = parse_skipto(conf, CC_WHITESPACE); 453 len = *conf - p; 454 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 455 bcopy(p, *tok, len); 456 return (0); 457 } 458 459 static void 460 parse_dir_ask_printenv(const char *var) 461 { 462 char *val; 463 464 val = kern_getenv(var); 465 if (val != NULL) { 466 printf(" %s=%s\n", var, val); 467 freeenv(val); 468 } 469 } 470 471 static int 472 parse_dir_ask(char **conf) 473 { 474 char name[80]; 475 char *mnt; 476 int error; 477 478 printf("\nLoader variables:\n"); 479 parse_dir_ask_printenv("vfs.root.mountfrom"); 480 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 481 482 printf("\nManual root filesystem specification:\n"); 483 printf(" <fstype>:<device> [options]\n"); 484 printf(" Mount <device> using filesystem <fstype>\n"); 485 printf(" and with the specified (optional) option list.\n"); 486 printf("\n"); 487 printf(" eg. ufs:/dev/da0s1a\n"); 488 printf(" zfs:tank\n"); 489 printf(" cd9660:/dev/acd0 ro\n"); 490 printf(" (which is equivalent to: "); 491 printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 492 printf("\n"); 493 printf(" ? List valid disk boot devices\n"); 494 printf(" . Yield 1 second (for background tasks)\n"); 495 printf(" <empty line> Abort manual input\n"); 496 497 do { 498 error = EINVAL; 499 printf("\nmountroot> "); 500 cngets(name, sizeof(name), GETS_ECHO); 501 if (name[0] == '\0') 502 break; 503 if (name[0] == '?' && name[1] == '\0') { 504 printf("\nList of GEOM managed disk devices:\n "); 505 g_dev_print(); 506 continue; 507 } 508 if (name[0] == '.' && name[1] == '\0') { 509 pause("rmask", hz); 510 continue; 511 } 512 mnt = name; 513 error = parse_mount(&mnt); 514 if (error == -1) 515 printf("Invalid file system specification.\n"); 516 } while (error != 0); 517 518 return (error); 519 } 520 521 static int 522 parse_dir_md(char **conf) 523 { 524 struct stat sb; 525 struct thread *td; 526 struct md_ioctl *mdio; 527 char *path, *tok; 528 int error, fd, len; 529 530 td = curthread; 531 532 error = parse_token(conf, &tok); 533 if (error) 534 return (error); 535 536 len = strlen(tok); 537 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 538 path = (void *)(mdio + 1); 539 bcopy(tok, path, len); 540 free(tok, M_TEMP); 541 542 /* Get file status. */ 543 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 544 if (error) 545 goto out; 546 547 /* Open /dev/mdctl so that we can attach/detach. */ 548 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 549 O_RDWR, 0); 550 if (error) 551 goto out; 552 553 fd = td->td_retval[0]; 554 mdio->md_version = MDIOVERSION; 555 mdio->md_type = MD_VNODE; 556 557 if (root_mount_mddev != -1) { 558 mdio->md_unit = root_mount_mddev; 559 DROP_GIANT(); 560 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 561 PICKUP_GIANT(); 562 /* Ignore errors. We don't care. */ 563 root_mount_mddev = -1; 564 } 565 566 mdio->md_file = (void *)(mdio + 1); 567 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 568 mdio->md_mediasize = sb.st_size; 569 mdio->md_unit = 0; 570 DROP_GIANT(); 571 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 572 PICKUP_GIANT(); 573 if (error) 574 goto out; 575 576 if (mdio->md_unit > 9) { 577 printf("rootmount: too many md units\n"); 578 mdio->md_file = NULL; 579 mdio->md_options = 0; 580 mdio->md_mediasize = 0; 581 DROP_GIANT(); 582 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 583 PICKUP_GIANT(); 584 /* Ignore errors. We don't care. */ 585 error = ERANGE; 586 goto out; 587 } 588 589 root_mount_mddev = mdio->md_unit; 590 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 591 592 error = kern_close(td, fd); 593 594 out: 595 free(mdio, M_TEMP); 596 return (error); 597 } 598 599 static int 600 parse_dir_onfail(char **conf) 601 { 602 char *action; 603 int error; 604 605 error = parse_token(conf, &action); 606 if (error) 607 return (error); 608 609 if (!strcmp(action, "continue")) 610 root_mount_onfail = A_CONTINUE; 611 else if (!strcmp(action, "panic")) 612 root_mount_onfail = A_PANIC; 613 else if (!strcmp(action, "reboot")) 614 root_mount_onfail = A_REBOOT; 615 else if (!strcmp(action, "retry")) 616 root_mount_onfail = A_RETRY; 617 else { 618 printf("rootmount: %s: unknown action\n", action); 619 error = EINVAL; 620 } 621 622 free(action, M_TEMP); 623 return (0); 624 } 625 626 static int 627 parse_dir_timeout(char **conf) 628 { 629 char *tok, *endtok; 630 long secs; 631 int error; 632 633 error = parse_token(conf, &tok); 634 if (error) 635 return (error); 636 637 secs = strtol(tok, &endtok, 0); 638 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 639 if (!error) 640 root_mount_timeout = secs; 641 free(tok, M_TEMP); 642 return (error); 643 } 644 645 static int 646 parse_directive(char **conf) 647 { 648 char *dir; 649 int error; 650 651 error = parse_token(conf, &dir); 652 if (error) 653 return (error); 654 655 if (strcmp(dir, ".ask") == 0) 656 error = parse_dir_ask(conf); 657 else if (strcmp(dir, ".md") == 0) 658 error = parse_dir_md(conf); 659 else if (strcmp(dir, ".onfail") == 0) 660 error = parse_dir_onfail(conf); 661 else if (strcmp(dir, ".timeout") == 0) 662 error = parse_dir_timeout(conf); 663 else { 664 printf("mountroot: invalid directive `%s'\n", dir); 665 /* Ignore the rest of the line. */ 666 (void)parse_skipto(conf, '\n'); 667 error = EINVAL; 668 } 669 free(dir, M_TEMP); 670 return (error); 671 } 672 673 static int 674 parse_mount_dev_present(const char *dev) 675 { 676 struct nameidata nd; 677 int error; 678 679 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 680 error = namei(&nd); 681 if (!error) 682 vput(nd.ni_vp); 683 NDFREE(&nd, NDF_ONLY_PNBUF); 684 return (error != 0) ? 0 : 1; 685 } 686 687 #define ERRMSGL 255 688 static int 689 parse_mount(char **conf) 690 { 691 char *errmsg; 692 struct mntarg *ma; 693 char *dev, *fs, *opts, *tok; 694 int delay, error, timeout; 695 696 error = parse_token(conf, &tok); 697 if (error) 698 return (error); 699 fs = tok; 700 error = parse_skipto(&tok, ':'); 701 if (error) { 702 free(fs, M_TEMP); 703 return (error); 704 } 705 parse_poke(&tok, '\0'); 706 parse_advance(&tok); 707 dev = tok; 708 709 if (root_mount_mddev != -1) { 710 /* Handle substitution for the md unit number. */ 711 tok = strstr(dev, "md#"); 712 if (tok != NULL) 713 tok[2] = '0' + root_mount_mddev; 714 } 715 716 /* Parse options. */ 717 error = parse_token(conf, &tok); 718 opts = (error == 0) ? tok : NULL; 719 720 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 721 (opts != NULL) ? opts : ""); 722 723 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 724 725 if (vfs_byname(fs) == NULL) { 726 strlcpy(errmsg, "unknown file system", ERRMSGL); 727 error = ENOENT; 728 goto out; 729 } 730 731 if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 732 dev[0] != '\0' && !parse_mount_dev_present(dev)) { 733 printf("mountroot: waiting for device %s ...\n", dev); 734 delay = hz / 10; 735 timeout = root_mount_timeout * hz; 736 do { 737 pause("rmdev", delay); 738 timeout -= delay; 739 } while (timeout > 0 && !parse_mount_dev_present(dev)); 740 if (timeout <= 0) { 741 error = ENODEV; 742 goto out; 743 } 744 } 745 746 ma = NULL; 747 ma = mount_arg(ma, "fstype", fs, -1); 748 ma = mount_arg(ma, "fspath", "/", -1); 749 ma = mount_arg(ma, "from", dev, -1); 750 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 751 ma = mount_arg(ma, "ro", NULL, 0); 752 ma = parse_mountroot_options(ma, opts); 753 error = kernel_mount(ma, MNT_ROOTFS); 754 755 out: 756 if (error) { 757 printf("Mounting from %s:%s failed with error %d", 758 fs, dev, error); 759 if (errmsg[0] != '\0') 760 printf(": %s", errmsg); 761 printf(".\n"); 762 } 763 free(fs, M_TEMP); 764 free(errmsg, M_TEMP); 765 if (opts != NULL) 766 free(opts, M_TEMP); 767 /* kernel_mount can return -1 on error. */ 768 return ((error < 0) ? EDOOFUS : error); 769 } 770 #undef ERRMSGL 771 772 static int 773 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 774 { 775 struct mount *mp; 776 char *conf; 777 int error; 778 779 root_mount_mddev = -1; 780 781 retry: 782 conf = sbuf_data(sb); 783 mp = TAILQ_NEXT(mpdevfs, mnt_list); 784 error = (mp == NULL) ? 0 : EDOOFUS; 785 root_mount_onfail = A_CONTINUE; 786 while (mp == NULL) { 787 error = parse_skipto(&conf, CC_NONWHITESPACE); 788 if (error == PE_EOL) { 789 parse_advance(&conf); 790 continue; 791 } 792 if (error < 0) 793 break; 794 switch (parse_peek(&conf)) { 795 case '#': 796 error = parse_skipto(&conf, '\n'); 797 break; 798 case '.': 799 error = parse_directive(&conf); 800 break; 801 default: 802 error = parse_mount(&conf); 803 if (error == -1) { 804 printf("mountroot: invalid file system " 805 "specification.\n"); 806 error = 0; 807 } 808 break; 809 } 810 if (error < 0) 811 break; 812 /* Ignore any trailing garbage on the line. */ 813 if (parse_peek(&conf) != '\n') { 814 printf("mountroot: advancing to next directive...\n"); 815 (void)parse_skipto(&conf, '\n'); 816 } 817 mp = TAILQ_NEXT(mpdevfs, mnt_list); 818 } 819 if (mp != NULL) 820 return (0); 821 822 /* 823 * We failed to mount (a new) root. 824 */ 825 switch (root_mount_onfail) { 826 case A_CONTINUE: 827 break; 828 case A_PANIC: 829 panic("mountroot: unable to (re-)mount root."); 830 /* NOTREACHED */ 831 case A_RETRY: 832 goto retry; 833 case A_REBOOT: 834 kern_reboot(RB_NOSYNC); 835 /* NOTREACHED */ 836 } 837 838 return (error); 839 } 840 841 static void 842 vfs_mountroot_conf0(struct sbuf *sb) 843 { 844 char *s, *tok, *mnt, *opt; 845 int error; 846 847 sbuf_printf(sb, ".onfail panic\n"); 848 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 849 if (boothowto & RB_ASKNAME) 850 sbuf_printf(sb, ".ask\n"); 851 #ifdef ROOTDEVNAME 852 if (boothowto & RB_DFLTROOT) 853 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 854 #endif 855 if (boothowto & RB_CDROM) { 856 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 857 sbuf_printf(sb, ".timeout 0\n"); 858 sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 859 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 860 } 861 s = kern_getenv("vfs.root.mountfrom"); 862 if (s != NULL) { 863 opt = kern_getenv("vfs.root.mountfrom.options"); 864 tok = s; 865 error = parse_token(&tok, &mnt); 866 while (!error) { 867 sbuf_printf(sb, "%s %s\n", mnt, 868 (opt != NULL) ? opt : ""); 869 free(mnt, M_TEMP); 870 error = parse_token(&tok, &mnt); 871 } 872 if (opt != NULL) 873 freeenv(opt); 874 freeenv(s); 875 } 876 if (rootdevnames[0] != NULL) 877 sbuf_printf(sb, "%s\n", rootdevnames[0]); 878 if (rootdevnames[1] != NULL) 879 sbuf_printf(sb, "%s\n", rootdevnames[1]); 880 #ifdef ROOTDEVNAME 881 if (!(boothowto & RB_DFLTROOT)) 882 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 883 #endif 884 if (!(boothowto & RB_ASKNAME)) 885 sbuf_printf(sb, ".ask\n"); 886 } 887 888 static int 889 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 890 { 891 static char buf[128]; 892 struct nameidata nd; 893 off_t ofs; 894 ssize_t resid; 895 int error, flags, len; 896 897 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 898 flags = FREAD; 899 error = vn_open(&nd, &flags, 0, NULL); 900 if (error) 901 return (error); 902 903 NDFREE(&nd, NDF_ONLY_PNBUF); 904 ofs = 0; 905 len = sizeof(buf) - 1; 906 while (1) { 907 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 908 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 909 NOCRED, &resid, td); 910 if (error) 911 break; 912 if (resid == len) 913 break; 914 buf[len - resid] = 0; 915 sbuf_printf(sb, "%s", buf); 916 ofs += len - resid; 917 } 918 919 VOP_UNLOCK(nd.ni_vp, 0); 920 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 921 return (error); 922 } 923 924 static void 925 vfs_mountroot_wait(void) 926 { 927 struct root_hold_token *h; 928 struct timeval lastfail; 929 int curfail; 930 931 curfail = 0; 932 while (1) { 933 DROP_GIANT(); 934 g_waitidle(); 935 PICKUP_GIANT(); 936 mtx_lock(&root_holds_mtx); 937 if (LIST_EMPTY(&root_holds)) { 938 mtx_unlock(&root_holds_mtx); 939 break; 940 } 941 if (ppsratecheck(&lastfail, &curfail, 1)) { 942 printf("Root mount waiting for:"); 943 LIST_FOREACH(h, &root_holds, list) 944 printf(" %s", h->who); 945 printf("\n"); 946 } 947 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 948 hz); 949 } 950 } 951 952 void 953 vfs_mountroot(void) 954 { 955 struct mount *mp; 956 struct sbuf *sb; 957 struct thread *td; 958 time_t timebase; 959 int error; 960 961 td = curthread; 962 963 vfs_mountroot_wait(); 964 965 sb = sbuf_new_auto(); 966 vfs_mountroot_conf0(sb); 967 sbuf_finish(sb); 968 969 error = vfs_mountroot_devfs(td, &mp); 970 while (!error) { 971 error = vfs_mountroot_parse(sb, mp); 972 if (!error) { 973 vfs_mountroot_shuffle(td, mp); 974 sbuf_clear(sb); 975 error = vfs_mountroot_readconf(td, sb); 976 sbuf_finish(sb); 977 } 978 } 979 980 sbuf_delete(sb); 981 982 /* 983 * Iterate over all currently mounted file systems and use 984 * the time stamp found to check and/or initialize the RTC. 985 * Call inittodr() only once and pass it the largest of the 986 * timestamps we encounter. 987 */ 988 timebase = 0; 989 mtx_lock(&mountlist_mtx); 990 mp = TAILQ_FIRST(&mountlist); 991 while (mp != NULL) { 992 if (mp->mnt_time > timebase) 993 timebase = mp->mnt_time; 994 mp = TAILQ_NEXT(mp, mnt_list); 995 } 996 mtx_unlock(&mountlist_mtx); 997 inittodr(timebase); 998 999 /* Keep prison0's root in sync with the global rootvnode. */ 1000 mtx_lock(&prison0.pr_mtx); 1001 prison0.pr_root = rootvnode; 1002 vref(prison0.pr_root); 1003 mtx_unlock(&prison0.pr_mtx); 1004 1005 mtx_lock(&root_holds_mtx); 1006 atomic_store_rel_int(&root_mount_complete, 1); 1007 wakeup(&root_mount_complete); 1008 mtx_unlock(&root_holds_mtx); 1009 1010 EVENTHANDLER_INVOKE(mountroot); 1011 } 1012 1013 static struct mntarg * 1014 parse_mountroot_options(struct mntarg *ma, const char *options) 1015 { 1016 char *p; 1017 char *name, *name_arg; 1018 char *val, *val_arg; 1019 char *opts; 1020 1021 if (options == NULL || options[0] == '\0') 1022 return (ma); 1023 1024 p = opts = strdup(options, M_MOUNT); 1025 if (opts == NULL) { 1026 return (ma); 1027 } 1028 1029 while((name = strsep(&p, ",")) != NULL) { 1030 if (name[0] == '\0') 1031 break; 1032 1033 val = strchr(name, '='); 1034 if (val != NULL) { 1035 *val = '\0'; 1036 ++val; 1037 } 1038 if( strcmp(name, "rw") == 0 || 1039 strcmp(name, "noro") == 0) { 1040 /* 1041 * The first time we mount the root file system, 1042 * we need to mount 'ro', so We need to ignore 1043 * 'rw' and 'noro' mount options. 1044 */ 1045 continue; 1046 } 1047 name_arg = strdup(name, M_MOUNT); 1048 val_arg = NULL; 1049 if (val != NULL) 1050 val_arg = strdup(val, M_MOUNT); 1051 1052 ma = mount_arg(ma, name_arg, val_arg, 1053 (val_arg != NULL ? -1 : 0)); 1054 } 1055 free(opts, M_MOUNT); 1056 return (ma); 1057 } 1058