1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2010 Marcel Moolenaar 5 * Copyright (c) 1999-2004 Poul-Henning Kamp 6 * Copyright (c) 1999 Michael Smith 7 * Copyright (c) 1989, 1993 8 * The Regents of the University of California. All rights reserved. 9 * (c) UNIX System Laboratories, Inc. 10 * All or some portions of this file are derived from material licensed 11 * to the University of California by American Telephone and Telegraph 12 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 13 * the permission of UNIX System Laboratories, Inc. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include "opt_rootdevname.h" 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/conf.h> 47 #include <sys/cons.h> 48 #include <sys/eventhandler.h> 49 #include <sys/fcntl.h> 50 #include <sys/jail.h> 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/mdioctl.h> 54 #include <sys/mount.h> 55 #include <sys/mutex.h> 56 #include <sys/namei.h> 57 #include <sys/priv.h> 58 #include <sys/proc.h> 59 #include <sys/filedesc.h> 60 #include <sys/reboot.h> 61 #include <sys/sbuf.h> 62 #include <sys/stat.h> 63 #include <sys/syscallsubr.h> 64 #include <sys/sysproto.h> 65 #include <sys/sx.h> 66 #include <sys/sysctl.h> 67 #include <sys/sysent.h> 68 #include <sys/systm.h> 69 #include <sys/vnode.h> 70 71 #include <geom/geom.h> 72 73 /* 74 * The root filesystem is detailed in the kernel environment variable 75 * vfs.root.mountfrom, which is expected to be in the general format 76 * 77 * <vfsname>:[<path>][ <vfsname>:[<path>] ...] 78 * vfsname := the name of a VFS known to the kernel and capable 79 * of being mounted as root 80 * path := disk device name or other data used by the filesystem 81 * to locate its physical store 82 * 83 * If the environment variable vfs.root.mountfrom is a space separated list, 84 * each list element is tried in turn and the root filesystem will be mounted 85 * from the first one that succeeds. 86 * 87 * The environment variable vfs.root.mountfrom.options is a comma delimited 88 * set of string mount options. These mount options must be parseable 89 * by nmount() in the kernel. 90 */ 91 92 static int parse_mount(char **); 93 static struct mntarg *parse_mountroot_options(struct mntarg *, const char *); 94 static int sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS); 95 static void vfs_mountroot_wait(void); 96 static int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev); 97 98 /* 99 * The vnode of the system's root (/ in the filesystem, without chroot 100 * active.) 101 */ 102 struct vnode *rootvnode; 103 104 /* 105 * Mount of the system's /dev. 106 */ 107 struct mount *rootdevmp; 108 109 char *rootdevnames[2] = {NULL, NULL}; 110 111 struct mtx root_holds_mtx; 112 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 113 114 struct root_hold_token { 115 const char *who; 116 LIST_ENTRY(root_hold_token) list; 117 }; 118 119 static LIST_HEAD(, root_hold_token) root_holds = 120 LIST_HEAD_INITIALIZER(root_holds); 121 122 enum action { 123 A_CONTINUE, 124 A_PANIC, 125 A_REBOOT, 126 A_RETRY 127 }; 128 129 static enum action root_mount_onfail = A_CONTINUE; 130 131 static int root_mount_mddev; 132 static int root_mount_complete; 133 134 /* By default wait up to 3 seconds for devices to appear. */ 135 static int root_mount_timeout = 3; 136 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 137 138 static int root_mount_always_wait = 0; 139 SYSCTL_INT(_vfs, OID_AUTO, root_mount_always_wait, CTLFLAG_RDTUN, 140 &root_mount_always_wait, 0, 141 "Wait for root mount holds even if the root device already exists"); 142 143 SYSCTL_PROC(_vfs, OID_AUTO, root_mount_hold, 144 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 145 NULL, 0, sysctl_vfs_root_mount_hold, "A", 146 "List of root mount hold tokens"); 147 148 static int 149 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS) 150 { 151 struct sbuf sb; 152 struct root_hold_token *h; 153 int error; 154 155 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL); 156 157 mtx_lock(&root_holds_mtx); 158 LIST_FOREACH(h, &root_holds, list) { 159 if (h != LIST_FIRST(&root_holds)) 160 sbuf_putc(&sb, ' '); 161 sbuf_printf(&sb, "%s", h->who); 162 } 163 mtx_unlock(&root_holds_mtx); 164 165 error = sbuf_finish(&sb); 166 if (error == 0) 167 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb)); 168 sbuf_delete(&sb); 169 return (error); 170 } 171 172 struct root_hold_token * 173 root_mount_hold(const char *identifier) 174 { 175 struct root_hold_token *h; 176 177 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 178 h->who = identifier; 179 mtx_lock(&root_holds_mtx); 180 TSHOLD("root mount"); 181 LIST_INSERT_HEAD(&root_holds, h, list); 182 mtx_unlock(&root_holds_mtx); 183 return (h); 184 } 185 186 void 187 root_mount_rel(struct root_hold_token *h) 188 { 189 190 if (h == NULL) 191 return; 192 193 mtx_lock(&root_holds_mtx); 194 LIST_REMOVE(h, list); 195 TSRELEASE("root mount"); 196 wakeup(&root_holds); 197 mtx_unlock(&root_holds_mtx); 198 free(h, M_DEVBUF); 199 } 200 201 int 202 root_mounted(void) 203 { 204 205 /* No mutex is acquired here because int stores are atomic. */ 206 return (root_mount_complete); 207 } 208 209 static void 210 set_rootvnode(void) 211 { 212 struct proc *p; 213 214 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 215 panic("set_rootvnode: Cannot find root vnode"); 216 217 VOP_UNLOCK(rootvnode, 0); 218 219 p = curthread->td_proc; 220 FILEDESC_XLOCK(p->p_fd); 221 222 if (p->p_fd->fd_cdir != NULL) 223 vrele(p->p_fd->fd_cdir); 224 p->p_fd->fd_cdir = rootvnode; 225 VREF(rootvnode); 226 227 if (p->p_fd->fd_rdir != NULL) 228 vrele(p->p_fd->fd_rdir); 229 p->p_fd->fd_rdir = rootvnode; 230 VREF(rootvnode); 231 232 FILEDESC_XUNLOCK(p->p_fd); 233 } 234 235 static int 236 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 237 { 238 struct vfsoptlist *opts; 239 struct vfsconf *vfsp; 240 struct mount *mp; 241 int error; 242 243 *mpp = NULL; 244 245 if (rootdevmp != NULL) { 246 /* 247 * Already have /dev; this happens during rerooting. 248 */ 249 error = vfs_busy(rootdevmp, 0); 250 if (error != 0) 251 return (error); 252 *mpp = rootdevmp; 253 } else { 254 vfsp = vfs_byname("devfs"); 255 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 256 if (vfsp == NULL) 257 return (ENOENT); 258 259 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 260 261 error = VFS_MOUNT(mp); 262 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 263 if (error) 264 return (error); 265 266 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 267 TAILQ_INIT(opts); 268 mp->mnt_opt = opts; 269 270 mtx_lock(&mountlist_mtx); 271 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 272 mtx_unlock(&mountlist_mtx); 273 274 *mpp = mp; 275 rootdevmp = mp; 276 } 277 278 set_rootvnode(); 279 280 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 281 if (error) 282 printf("kern_symlink /dev -> / returns %d\n", error); 283 284 return (error); 285 } 286 287 static void 288 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 289 { 290 struct nameidata nd; 291 struct mount *mporoot, *mpnroot; 292 struct vnode *vp, *vporoot, *vpdevfs; 293 char *fspath; 294 int error; 295 296 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 297 298 /* Shuffle the mountlist. */ 299 mtx_lock(&mountlist_mtx); 300 mporoot = TAILQ_FIRST(&mountlist); 301 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 302 if (mporoot != mpdevfs) { 303 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 304 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 305 } 306 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 307 mtx_unlock(&mountlist_mtx); 308 309 cache_purgevfs(mporoot, true); 310 if (mporoot != mpdevfs) 311 cache_purgevfs(mpdevfs, true); 312 313 if (VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot)) 314 panic("vfs_mountroot_shuffle: Cannot find root vnode"); 315 316 VI_LOCK(vporoot); 317 vporoot->v_iflag &= ~VI_MOUNT; 318 VI_UNLOCK(vporoot); 319 vporoot->v_mountedhere = NULL; 320 mporoot->mnt_flag &= ~MNT_ROOTFS; 321 mporoot->mnt_vnodecovered = NULL; 322 vput(vporoot); 323 324 /* Set up the new rootvnode, and purge the cache */ 325 mpnroot->mnt_vnodecovered = NULL; 326 set_rootvnode(); 327 cache_purgevfs(rootvnode->v_mount, true); 328 329 if (mporoot != mpdevfs) { 330 /* Remount old root under /.mount or /mnt */ 331 fspath = "/.mount"; 332 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 333 fspath, td); 334 error = namei(&nd); 335 if (error) { 336 NDFREE(&nd, NDF_ONLY_PNBUF); 337 fspath = "/mnt"; 338 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 339 fspath, td); 340 error = namei(&nd); 341 } 342 if (!error) { 343 vp = nd.ni_vp; 344 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 345 if (!error) 346 error = vinvalbuf(vp, V_SAVE, 0, 0); 347 if (!error) { 348 cache_purge(vp); 349 mporoot->mnt_vnodecovered = vp; 350 vp->v_mountedhere = mporoot; 351 strlcpy(mporoot->mnt_stat.f_mntonname, 352 fspath, MNAMELEN); 353 VOP_UNLOCK(vp, 0); 354 } else 355 vput(vp); 356 } 357 NDFREE(&nd, NDF_ONLY_PNBUF); 358 359 if (error) 360 printf("mountroot: unable to remount previous root " 361 "under /.mount or /mnt (error %d)\n", error); 362 } 363 364 /* Remount devfs under /dev */ 365 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 366 error = namei(&nd); 367 if (!error) { 368 vp = nd.ni_vp; 369 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 370 if (!error) 371 error = vinvalbuf(vp, V_SAVE, 0, 0); 372 if (!error) { 373 vpdevfs = mpdevfs->mnt_vnodecovered; 374 if (vpdevfs != NULL) { 375 cache_purge(vpdevfs); 376 vpdevfs->v_mountedhere = NULL; 377 vrele(vpdevfs); 378 } 379 mpdevfs->mnt_vnodecovered = vp; 380 vp->v_mountedhere = mpdevfs; 381 VOP_UNLOCK(vp, 0); 382 } else 383 vput(vp); 384 } 385 if (error) 386 printf("mountroot: unable to remount devfs under /dev " 387 "(error %d)\n", error); 388 NDFREE(&nd, NDF_ONLY_PNBUF); 389 390 if (mporoot == mpdevfs) { 391 vfs_unbusy(mpdevfs); 392 /* Unlink the no longer needed /dev/dev -> / symlink */ 393 error = kern_funlinkat(td, AT_FDCWD, "/dev/dev", FD_NONE, 394 UIO_SYSSPACE, 0, 0); 395 if (error) 396 printf("mountroot: unable to unlink /dev/dev " 397 "(error %d)\n", error); 398 } 399 } 400 401 /* 402 * Configuration parser. 403 */ 404 405 /* Parser character classes. */ 406 #define CC_WHITESPACE -1 407 #define CC_NONWHITESPACE -2 408 409 /* Parse errors. */ 410 #define PE_EOF -1 411 #define PE_EOL -2 412 413 static __inline int 414 parse_peek(char **conf) 415 { 416 417 return (**conf); 418 } 419 420 static __inline void 421 parse_poke(char **conf, int c) 422 { 423 424 **conf = c; 425 } 426 427 static __inline void 428 parse_advance(char **conf) 429 { 430 431 (*conf)++; 432 } 433 434 static int 435 parse_skipto(char **conf, int mc) 436 { 437 int c, match; 438 439 while (1) { 440 c = parse_peek(conf); 441 if (c == 0) 442 return (PE_EOF); 443 switch (mc) { 444 case CC_WHITESPACE: 445 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 446 break; 447 case CC_NONWHITESPACE: 448 if (c == '\n') 449 return (PE_EOL); 450 match = (c != ' ' && c != '\t') ? 1 : 0; 451 break; 452 default: 453 match = (c == mc) ? 1 : 0; 454 break; 455 } 456 if (match) 457 break; 458 parse_advance(conf); 459 } 460 return (0); 461 } 462 463 static int 464 parse_token(char **conf, char **tok) 465 { 466 char *p; 467 size_t len; 468 int error; 469 470 *tok = NULL; 471 error = parse_skipto(conf, CC_NONWHITESPACE); 472 if (error) 473 return (error); 474 p = *conf; 475 error = parse_skipto(conf, CC_WHITESPACE); 476 len = *conf - p; 477 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 478 bcopy(p, *tok, len); 479 return (0); 480 } 481 482 static void 483 parse_dir_ask_printenv(const char *var) 484 { 485 char *val; 486 487 val = kern_getenv(var); 488 if (val != NULL) { 489 printf(" %s=%s\n", var, val); 490 freeenv(val); 491 } 492 } 493 494 static int 495 parse_dir_ask(char **conf) 496 { 497 char name[80]; 498 char *mnt; 499 int error; 500 501 vfs_mountroot_wait(); 502 503 printf("\nLoader variables:\n"); 504 parse_dir_ask_printenv("vfs.root.mountfrom"); 505 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 506 507 printf("\nManual root filesystem specification:\n"); 508 printf(" <fstype>:<device> [options]\n"); 509 printf(" Mount <device> using filesystem <fstype>\n"); 510 printf(" and with the specified (optional) option list.\n"); 511 printf("\n"); 512 printf(" eg. ufs:/dev/da0s1a\n"); 513 printf(" zfs:zroot/ROOT/default\n"); 514 printf(" cd9660:/dev/cd0 ro\n"); 515 printf(" (which is equivalent to: "); 516 printf("mount -t cd9660 -o ro /dev/cd0 /)\n"); 517 printf("\n"); 518 printf(" ? List valid disk boot devices\n"); 519 printf(" . Yield 1 second (for background tasks)\n"); 520 printf(" <empty line> Abort manual input\n"); 521 522 do { 523 error = EINVAL; 524 printf("\nmountroot> "); 525 cngets(name, sizeof(name), GETS_ECHO); 526 if (name[0] == '\0') 527 break; 528 if (name[0] == '?' && name[1] == '\0') { 529 printf("\nList of GEOM managed disk devices:\n "); 530 g_dev_print(); 531 continue; 532 } 533 if (name[0] == '.' && name[1] == '\0') { 534 pause("rmask", hz); 535 continue; 536 } 537 mnt = name; 538 error = parse_mount(&mnt); 539 if (error == -1) 540 printf("Invalid file system specification.\n"); 541 } while (error != 0); 542 543 return (error); 544 } 545 546 static int 547 parse_dir_md(char **conf) 548 { 549 struct stat sb; 550 struct thread *td; 551 struct md_ioctl *mdio; 552 char *path, *tok; 553 int error, fd, len; 554 555 td = curthread; 556 557 error = parse_token(conf, &tok); 558 if (error) 559 return (error); 560 561 len = strlen(tok); 562 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 563 path = (void *)(mdio + 1); 564 bcopy(tok, path, len); 565 free(tok, M_TEMP); 566 567 /* Get file status. */ 568 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 569 if (error) 570 goto out; 571 572 /* Open /dev/mdctl so that we can attach/detach. */ 573 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 574 O_RDWR, 0); 575 if (error) 576 goto out; 577 578 fd = td->td_retval[0]; 579 mdio->md_version = MDIOVERSION; 580 mdio->md_type = MD_VNODE; 581 582 if (root_mount_mddev != -1) { 583 mdio->md_unit = root_mount_mddev; 584 (void)kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 585 /* Ignore errors. We don't care. */ 586 root_mount_mddev = -1; 587 } 588 589 mdio->md_file = (void *)(mdio + 1); 590 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 591 mdio->md_mediasize = sb.st_size; 592 mdio->md_unit = 0; 593 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 594 if (error) 595 goto out; 596 597 if (mdio->md_unit > 9) { 598 printf("rootmount: too many md units\n"); 599 mdio->md_file = NULL; 600 mdio->md_options = 0; 601 mdio->md_mediasize = 0; 602 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 603 /* Ignore errors. We don't care. */ 604 error = ERANGE; 605 goto out; 606 } 607 608 root_mount_mddev = mdio->md_unit; 609 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 610 611 error = kern_close(td, fd); 612 613 out: 614 free(mdio, M_TEMP); 615 return (error); 616 } 617 618 static int 619 parse_dir_onfail(char **conf) 620 { 621 char *action; 622 int error; 623 624 error = parse_token(conf, &action); 625 if (error) 626 return (error); 627 628 if (!strcmp(action, "continue")) 629 root_mount_onfail = A_CONTINUE; 630 else if (!strcmp(action, "panic")) 631 root_mount_onfail = A_PANIC; 632 else if (!strcmp(action, "reboot")) 633 root_mount_onfail = A_REBOOT; 634 else if (!strcmp(action, "retry")) 635 root_mount_onfail = A_RETRY; 636 else { 637 printf("rootmount: %s: unknown action\n", action); 638 error = EINVAL; 639 } 640 641 free(action, M_TEMP); 642 return (0); 643 } 644 645 static int 646 parse_dir_timeout(char **conf) 647 { 648 char *tok, *endtok; 649 long secs; 650 int error; 651 652 error = parse_token(conf, &tok); 653 if (error) 654 return (error); 655 656 secs = strtol(tok, &endtok, 0); 657 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 658 if (!error) 659 root_mount_timeout = secs; 660 free(tok, M_TEMP); 661 return (error); 662 } 663 664 static int 665 parse_directive(char **conf) 666 { 667 char *dir; 668 int error; 669 670 error = parse_token(conf, &dir); 671 if (error) 672 return (error); 673 674 if (strcmp(dir, ".ask") == 0) 675 error = parse_dir_ask(conf); 676 else if (strcmp(dir, ".md") == 0) 677 error = parse_dir_md(conf); 678 else if (strcmp(dir, ".onfail") == 0) 679 error = parse_dir_onfail(conf); 680 else if (strcmp(dir, ".timeout") == 0) 681 error = parse_dir_timeout(conf); 682 else { 683 printf("mountroot: invalid directive `%s'\n", dir); 684 /* Ignore the rest of the line. */ 685 (void)parse_skipto(conf, '\n'); 686 error = EINVAL; 687 } 688 free(dir, M_TEMP); 689 return (error); 690 } 691 692 static int 693 parse_mount_dev_present(const char *dev) 694 { 695 struct nameidata nd; 696 int error; 697 698 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 699 error = namei(&nd); 700 if (!error) 701 vput(nd.ni_vp); 702 NDFREE(&nd, NDF_ONLY_PNBUF); 703 return (error != 0) ? 0 : 1; 704 } 705 706 #define ERRMSGL 255 707 static int 708 parse_mount(char **conf) 709 { 710 char *errmsg; 711 struct mntarg *ma; 712 char *dev, *fs, *opts, *tok; 713 int delay, error, timeout; 714 715 error = parse_token(conf, &tok); 716 if (error) 717 return (error); 718 fs = tok; 719 error = parse_skipto(&tok, ':'); 720 if (error) { 721 free(fs, M_TEMP); 722 return (error); 723 } 724 parse_poke(&tok, '\0'); 725 parse_advance(&tok); 726 dev = tok; 727 728 if (root_mount_mddev != -1) { 729 /* Handle substitution for the md unit number. */ 730 tok = strstr(dev, "md#"); 731 if (tok != NULL) 732 tok[2] = '0' + root_mount_mddev; 733 } 734 735 /* Parse options. */ 736 error = parse_token(conf, &tok); 737 opts = (error == 0) ? tok : NULL; 738 739 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 740 (opts != NULL) ? opts : ""); 741 742 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 743 744 if (vfs_byname(fs) == NULL) { 745 strlcpy(errmsg, "unknown file system", ERRMSGL); 746 error = ENOENT; 747 goto out; 748 } 749 750 error = vfs_mountroot_wait_if_neccessary(fs, dev); 751 if (error != 0) 752 goto out; 753 754 delay = hz / 10; 755 timeout = root_mount_timeout * hz; 756 757 for (;;) { 758 ma = NULL; 759 ma = mount_arg(ma, "fstype", fs, -1); 760 ma = mount_arg(ma, "fspath", "/", -1); 761 ma = mount_arg(ma, "from", dev, -1); 762 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 763 ma = mount_arg(ma, "ro", NULL, 0); 764 ma = parse_mountroot_options(ma, opts); 765 766 error = kernel_mount(ma, MNT_ROOTFS); 767 if (error == 0 || timeout <= 0) 768 break; 769 770 if (root_mount_timeout * hz == timeout || 771 (bootverbose && timeout % hz == 0)) { 772 printf("Mounting from %s:%s failed with error %d; " 773 "retrying for %d more second%s\n", fs, dev, error, 774 timeout / hz, (timeout / hz > 1) ? "s" : ""); 775 } 776 pause("rmretry", delay); 777 timeout -= delay; 778 } 779 out: 780 if (error) { 781 printf("Mounting from %s:%s failed with error %d", 782 fs, dev, error); 783 if (errmsg[0] != '\0') 784 printf(": %s", errmsg); 785 printf(".\n"); 786 } 787 free(fs, M_TEMP); 788 free(errmsg, M_TEMP); 789 if (opts != NULL) 790 free(opts, M_TEMP); 791 /* kernel_mount can return -1 on error. */ 792 return ((error < 0) ? EDOOFUS : error); 793 } 794 #undef ERRMSGL 795 796 static int 797 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 798 { 799 struct mount *mp; 800 char *conf; 801 int error; 802 803 root_mount_mddev = -1; 804 805 retry: 806 conf = sbuf_data(sb); 807 mp = TAILQ_NEXT(mpdevfs, mnt_list); 808 error = (mp == NULL) ? 0 : EDOOFUS; 809 root_mount_onfail = A_CONTINUE; 810 while (mp == NULL) { 811 error = parse_skipto(&conf, CC_NONWHITESPACE); 812 if (error == PE_EOL) { 813 parse_advance(&conf); 814 continue; 815 } 816 if (error < 0) 817 break; 818 switch (parse_peek(&conf)) { 819 case '#': 820 error = parse_skipto(&conf, '\n'); 821 break; 822 case '.': 823 error = parse_directive(&conf); 824 break; 825 default: 826 error = parse_mount(&conf); 827 if (error == -1) { 828 printf("mountroot: invalid file system " 829 "specification.\n"); 830 error = 0; 831 } 832 break; 833 } 834 if (error < 0) 835 break; 836 /* Ignore any trailing garbage on the line. */ 837 if (parse_peek(&conf) != '\n') { 838 printf("mountroot: advancing to next directive...\n"); 839 (void)parse_skipto(&conf, '\n'); 840 } 841 mp = TAILQ_NEXT(mpdevfs, mnt_list); 842 } 843 if (mp != NULL) 844 return (0); 845 846 /* 847 * We failed to mount (a new) root. 848 */ 849 switch (root_mount_onfail) { 850 case A_CONTINUE: 851 break; 852 case A_PANIC: 853 panic("mountroot: unable to (re-)mount root."); 854 /* NOTREACHED */ 855 case A_RETRY: 856 goto retry; 857 case A_REBOOT: 858 kern_reboot(RB_NOSYNC); 859 /* NOTREACHED */ 860 } 861 862 return (error); 863 } 864 865 static void 866 vfs_mountroot_conf0(struct sbuf *sb) 867 { 868 char *s, *tok, *mnt, *opt; 869 int error; 870 871 sbuf_printf(sb, ".onfail panic\n"); 872 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 873 if (boothowto & RB_ASKNAME) 874 sbuf_printf(sb, ".ask\n"); 875 #ifdef ROOTDEVNAME 876 if (boothowto & RB_DFLTROOT) 877 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 878 #endif 879 if (boothowto & RB_CDROM) { 880 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 881 sbuf_printf(sb, ".timeout 0\n"); 882 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n"); 883 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 884 } 885 s = kern_getenv("vfs.root.mountfrom"); 886 if (s != NULL) { 887 opt = kern_getenv("vfs.root.mountfrom.options"); 888 tok = s; 889 error = parse_token(&tok, &mnt); 890 while (!error) { 891 sbuf_printf(sb, "%s %s\n", mnt, 892 (opt != NULL) ? opt : ""); 893 free(mnt, M_TEMP); 894 error = parse_token(&tok, &mnt); 895 } 896 if (opt != NULL) 897 freeenv(opt); 898 freeenv(s); 899 } 900 if (rootdevnames[0] != NULL) 901 sbuf_printf(sb, "%s\n", rootdevnames[0]); 902 if (rootdevnames[1] != NULL) 903 sbuf_printf(sb, "%s\n", rootdevnames[1]); 904 #ifdef ROOTDEVNAME 905 if (!(boothowto & RB_DFLTROOT)) 906 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 907 #endif 908 if (!(boothowto & RB_ASKNAME)) 909 sbuf_printf(sb, ".ask\n"); 910 } 911 912 static int 913 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 914 { 915 static char buf[128]; 916 struct nameidata nd; 917 off_t ofs; 918 ssize_t resid; 919 int error, flags, len; 920 921 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 922 flags = FREAD; 923 error = vn_open(&nd, &flags, 0, NULL); 924 if (error) 925 return (error); 926 927 NDFREE(&nd, NDF_ONLY_PNBUF); 928 ofs = 0; 929 len = sizeof(buf) - 1; 930 while (1) { 931 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 932 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 933 NOCRED, &resid, td); 934 if (error) 935 break; 936 if (resid == len) 937 break; 938 buf[len - resid] = 0; 939 sbuf_printf(sb, "%s", buf); 940 ofs += len - resid; 941 } 942 943 VOP_UNLOCK(nd.ni_vp, 0); 944 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 945 return (error); 946 } 947 948 static void 949 vfs_mountroot_wait(void) 950 { 951 struct root_hold_token *h; 952 struct timeval lastfail; 953 int curfail; 954 955 TSENTER(); 956 957 curfail = 0; 958 while (1) { 959 g_waitidle(); 960 mtx_lock(&root_holds_mtx); 961 if (LIST_EMPTY(&root_holds)) { 962 mtx_unlock(&root_holds_mtx); 963 break; 964 } 965 if (ppsratecheck(&lastfail, &curfail, 1)) { 966 printf("Root mount waiting for:"); 967 LIST_FOREACH(h, &root_holds, list) 968 printf(" %s", h->who); 969 printf("\n"); 970 } 971 TSWAIT("root mount"); 972 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 973 hz); 974 TSUNWAIT("root mount"); 975 } 976 977 TSEXIT(); 978 } 979 980 static int 981 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev) 982 { 983 int delay, timeout; 984 985 /* 986 * In case of ZFS and NFS we don't have a way to wait for 987 * specific device. Also do the wait if the user forced that 988 * behaviour by setting vfs.root_mount_always_wait=1. 989 */ 990 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL || 991 dev[0] == '\0' || root_mount_always_wait != 0) { 992 vfs_mountroot_wait(); 993 return (0); 994 } 995 996 /* 997 * Otherwise, no point in waiting if the device is already there. 998 * Note that we must wait for GEOM to finish reconfiguring itself, 999 * eg for geom_part(4) to finish tasting. 1000 */ 1001 g_waitidle(); 1002 if (parse_mount_dev_present(dev)) 1003 return (0); 1004 1005 /* 1006 * No luck. Let's wait. This code looks weird, but it's that way 1007 * to behave exactly as it used to work before. 1008 */ 1009 vfs_mountroot_wait(); 1010 printf("mountroot: waiting for device %s...\n", dev); 1011 delay = hz / 10; 1012 timeout = root_mount_timeout * hz; 1013 do { 1014 pause("rmdev", delay); 1015 timeout -= delay; 1016 } while (timeout > 0 && !parse_mount_dev_present(dev)); 1017 1018 if (timeout <= 0) 1019 return (ENODEV); 1020 1021 return (0); 1022 } 1023 1024 void 1025 vfs_mountroot(void) 1026 { 1027 struct mount *mp; 1028 struct sbuf *sb; 1029 struct thread *td; 1030 time_t timebase; 1031 int error; 1032 1033 mtx_assert(&Giant, MA_NOTOWNED); 1034 1035 TSENTER(); 1036 1037 td = curthread; 1038 1039 sb = sbuf_new_auto(); 1040 vfs_mountroot_conf0(sb); 1041 sbuf_finish(sb); 1042 1043 error = vfs_mountroot_devfs(td, &mp); 1044 while (!error) { 1045 error = vfs_mountroot_parse(sb, mp); 1046 if (!error) { 1047 vfs_mountroot_shuffle(td, mp); 1048 sbuf_clear(sb); 1049 error = vfs_mountroot_readconf(td, sb); 1050 sbuf_finish(sb); 1051 } 1052 } 1053 1054 sbuf_delete(sb); 1055 1056 /* 1057 * Iterate over all currently mounted file systems and use 1058 * the time stamp found to check and/or initialize the RTC. 1059 * Call inittodr() only once and pass it the largest of the 1060 * timestamps we encounter. 1061 */ 1062 timebase = 0; 1063 mtx_lock(&mountlist_mtx); 1064 mp = TAILQ_FIRST(&mountlist); 1065 while (mp != NULL) { 1066 if (mp->mnt_time > timebase) 1067 timebase = mp->mnt_time; 1068 mp = TAILQ_NEXT(mp, mnt_list); 1069 } 1070 mtx_unlock(&mountlist_mtx); 1071 inittodr(timebase); 1072 1073 /* Keep prison0's root in sync with the global rootvnode. */ 1074 mtx_lock(&prison0.pr_mtx); 1075 prison0.pr_root = rootvnode; 1076 vref(prison0.pr_root); 1077 mtx_unlock(&prison0.pr_mtx); 1078 1079 mtx_lock(&root_holds_mtx); 1080 atomic_store_rel_int(&root_mount_complete, 1); 1081 wakeup(&root_mount_complete); 1082 mtx_unlock(&root_holds_mtx); 1083 1084 EVENTHANDLER_INVOKE(mountroot); 1085 1086 TSEXIT(); 1087 } 1088 1089 static struct mntarg * 1090 parse_mountroot_options(struct mntarg *ma, const char *options) 1091 { 1092 char *p; 1093 char *name, *name_arg; 1094 char *val, *val_arg; 1095 char *opts; 1096 1097 if (options == NULL || options[0] == '\0') 1098 return (ma); 1099 1100 p = opts = strdup(options, M_MOUNT); 1101 if (opts == NULL) { 1102 return (ma); 1103 } 1104 1105 while((name = strsep(&p, ",")) != NULL) { 1106 if (name[0] == '\0') 1107 break; 1108 1109 val = strchr(name, '='); 1110 if (val != NULL) { 1111 *val = '\0'; 1112 ++val; 1113 } 1114 if( strcmp(name, "rw") == 0 || 1115 strcmp(name, "noro") == 0) { 1116 /* 1117 * The first time we mount the root file system, 1118 * we need to mount 'ro', so We need to ignore 1119 * 'rw' and 'noro' mount options. 1120 */ 1121 continue; 1122 } 1123 name_arg = strdup(name, M_MOUNT); 1124 val_arg = NULL; 1125 if (val != NULL) 1126 val_arg = strdup(val, M_MOUNT); 1127 1128 ma = mount_arg(ma, name_arg, val_arg, 1129 (val_arg != NULL ? -1 : 0)); 1130 } 1131 free(opts, M_MOUNT); 1132 return (ma); 1133 } 1134