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 * 3. 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 succeeds. 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 static int sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS); 92 static void vfs_mountroot_wait(void); 93 static int vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev); 94 95 /* 96 * The vnode of the system's root (/ in the filesystem, without chroot 97 * active.) 98 */ 99 struct vnode *rootvnode; 100 101 /* 102 * Mount of the system's /dev. 103 */ 104 struct mount *rootdevmp; 105 106 char *rootdevnames[2] = {NULL, NULL}; 107 108 struct mtx root_holds_mtx; 109 MTX_SYSINIT(root_holds, &root_holds_mtx, "root_holds", MTX_DEF); 110 111 struct root_hold_token { 112 const char *who; 113 LIST_ENTRY(root_hold_token) list; 114 }; 115 116 static LIST_HEAD(, root_hold_token) root_holds = 117 LIST_HEAD_INITIALIZER(root_holds); 118 119 enum action { 120 A_CONTINUE, 121 A_PANIC, 122 A_REBOOT, 123 A_RETRY 124 }; 125 126 static enum action root_mount_onfail = A_CONTINUE; 127 128 static int root_mount_mddev; 129 static int root_mount_complete; 130 131 /* By default wait up to 3 seconds for devices to appear. */ 132 static int root_mount_timeout = 3; 133 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 134 135 static int root_mount_always_wait = 0; 136 SYSCTL_INT(_vfs, OID_AUTO, root_mount_always_wait, CTLFLAG_RDTUN, 137 &root_mount_always_wait, 0, 138 "Wait for root mount holds even if the root device already exists"); 139 140 SYSCTL_PROC(_vfs, OID_AUTO, root_mount_hold, 141 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 142 NULL, 0, sysctl_vfs_root_mount_hold, "A", 143 "List of root mount hold tokens"); 144 145 static int 146 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS) 147 { 148 struct sbuf sb; 149 struct root_hold_token *h; 150 int error; 151 152 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL); 153 154 mtx_lock(&root_holds_mtx); 155 LIST_FOREACH(h, &root_holds, list) { 156 if (h != LIST_FIRST(&root_holds)) 157 sbuf_putc(&sb, ' '); 158 sbuf_printf(&sb, "%s", h->who); 159 } 160 mtx_unlock(&root_holds_mtx); 161 162 error = sbuf_finish(&sb); 163 if (error == 0) 164 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb)); 165 sbuf_delete(&sb); 166 return (error); 167 } 168 169 struct root_hold_token * 170 root_mount_hold(const char *identifier) 171 { 172 struct root_hold_token *h; 173 174 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 175 h->who = identifier; 176 mtx_lock(&root_holds_mtx); 177 LIST_INSERT_HEAD(&root_holds, h, list); 178 mtx_unlock(&root_holds_mtx); 179 return (h); 180 } 181 182 void 183 root_mount_rel(struct root_hold_token *h) 184 { 185 186 if (h == NULL) 187 return; 188 189 mtx_lock(&root_holds_mtx); 190 LIST_REMOVE(h, list); 191 wakeup(&root_holds); 192 mtx_unlock(&root_holds_mtx); 193 free(h, M_DEVBUF); 194 } 195 196 int 197 root_mounted(void) 198 { 199 200 /* No mutex is acquired here because int stores are atomic. */ 201 return (root_mount_complete); 202 } 203 204 static void 205 set_rootvnode(void) 206 { 207 struct proc *p; 208 209 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 210 panic("Cannot find root vnode"); 211 212 VOP_UNLOCK(rootvnode, 0); 213 214 p = curthread->td_proc; 215 FILEDESC_XLOCK(p->p_fd); 216 217 if (p->p_fd->fd_cdir != NULL) 218 vrele(p->p_fd->fd_cdir); 219 p->p_fd->fd_cdir = rootvnode; 220 VREF(rootvnode); 221 222 if (p->p_fd->fd_rdir != NULL) 223 vrele(p->p_fd->fd_rdir); 224 p->p_fd->fd_rdir = rootvnode; 225 VREF(rootvnode); 226 227 FILEDESC_XUNLOCK(p->p_fd); 228 } 229 230 static int 231 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 232 { 233 struct vfsoptlist *opts; 234 struct vfsconf *vfsp; 235 struct mount *mp; 236 int error; 237 238 *mpp = NULL; 239 240 if (rootdevmp != NULL) { 241 /* 242 * Already have /dev; this happens during rerooting. 243 */ 244 error = vfs_busy(rootdevmp, 0); 245 if (error != 0) 246 return (error); 247 *mpp = rootdevmp; 248 } else { 249 vfsp = vfs_byname("devfs"); 250 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 251 if (vfsp == NULL) 252 return (ENOENT); 253 254 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 255 256 error = VFS_MOUNT(mp); 257 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 258 if (error) 259 return (error); 260 261 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 262 TAILQ_INIT(opts); 263 mp->mnt_opt = opts; 264 265 mtx_lock(&mountlist_mtx); 266 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 267 mtx_unlock(&mountlist_mtx); 268 269 *mpp = mp; 270 rootdevmp = mp; 271 } 272 273 set_rootvnode(); 274 275 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 276 if (error) 277 printf("kern_symlink /dev -> / returns %d\n", error); 278 279 return (error); 280 } 281 282 static void 283 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 284 { 285 struct nameidata nd; 286 struct mount *mporoot, *mpnroot; 287 struct vnode *vp, *vporoot, *vpdevfs; 288 char *fspath; 289 int error; 290 291 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 292 293 /* Shuffle the mountlist. */ 294 mtx_lock(&mountlist_mtx); 295 mporoot = TAILQ_FIRST(&mountlist); 296 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 297 if (mporoot != mpdevfs) { 298 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 299 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 300 } 301 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 302 mtx_unlock(&mountlist_mtx); 303 304 cache_purgevfs(mporoot, true); 305 if (mporoot != mpdevfs) 306 cache_purgevfs(mpdevfs, true); 307 308 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 309 310 VI_LOCK(vporoot); 311 vporoot->v_iflag &= ~VI_MOUNT; 312 VI_UNLOCK(vporoot); 313 vporoot->v_mountedhere = NULL; 314 mporoot->mnt_flag &= ~MNT_ROOTFS; 315 mporoot->mnt_vnodecovered = NULL; 316 vput(vporoot); 317 318 /* Set up the new rootvnode, and purge the cache */ 319 mpnroot->mnt_vnodecovered = NULL; 320 set_rootvnode(); 321 cache_purgevfs(rootvnode->v_mount, true); 322 323 if (mporoot != mpdevfs) { 324 /* Remount old root under /.mount or /mnt */ 325 fspath = "/.mount"; 326 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 327 fspath, td); 328 error = namei(&nd); 329 if (error) { 330 NDFREE(&nd, NDF_ONLY_PNBUF); 331 fspath = "/mnt"; 332 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 333 fspath, td); 334 error = namei(&nd); 335 } 336 if (!error) { 337 vp = nd.ni_vp; 338 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 339 if (!error) 340 error = vinvalbuf(vp, V_SAVE, 0, 0); 341 if (!error) { 342 cache_purge(vp); 343 mporoot->mnt_vnodecovered = vp; 344 vp->v_mountedhere = mporoot; 345 strlcpy(mporoot->mnt_stat.f_mntonname, 346 fspath, MNAMELEN); 347 VOP_UNLOCK(vp, 0); 348 } else 349 vput(vp); 350 } 351 NDFREE(&nd, NDF_ONLY_PNBUF); 352 353 if (error) 354 printf("mountroot: unable to remount previous root " 355 "under /.mount or /mnt (error %d)\n", error); 356 } 357 358 /* Remount devfs under /dev */ 359 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 360 error = namei(&nd); 361 if (!error) { 362 vp = nd.ni_vp; 363 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 364 if (!error) 365 error = vinvalbuf(vp, V_SAVE, 0, 0); 366 if (!error) { 367 vpdevfs = mpdevfs->mnt_vnodecovered; 368 if (vpdevfs != NULL) { 369 cache_purge(vpdevfs); 370 vpdevfs->v_mountedhere = NULL; 371 vrele(vpdevfs); 372 } 373 mpdevfs->mnt_vnodecovered = vp; 374 vp->v_mountedhere = mpdevfs; 375 VOP_UNLOCK(vp, 0); 376 } else 377 vput(vp); 378 } 379 if (error) 380 printf("mountroot: unable to remount devfs under /dev " 381 "(error %d)\n", error); 382 NDFREE(&nd, NDF_ONLY_PNBUF); 383 384 if (mporoot == mpdevfs) { 385 vfs_unbusy(mpdevfs); 386 /* Unlink the no longer needed /dev/dev -> / symlink */ 387 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 388 UIO_SYSSPACE, 0); 389 if (error) 390 printf("mountroot: unable to unlink /dev/dev " 391 "(error %d)\n", error); 392 } 393 } 394 395 /* 396 * Configuration parser. 397 */ 398 399 /* Parser character classes. */ 400 #define CC_WHITESPACE -1 401 #define CC_NONWHITESPACE -2 402 403 /* Parse errors. */ 404 #define PE_EOF -1 405 #define PE_EOL -2 406 407 static __inline int 408 parse_peek(char **conf) 409 { 410 411 return (**conf); 412 } 413 414 static __inline void 415 parse_poke(char **conf, int c) 416 { 417 418 **conf = c; 419 } 420 421 static __inline void 422 parse_advance(char **conf) 423 { 424 425 (*conf)++; 426 } 427 428 static int 429 parse_skipto(char **conf, int mc) 430 { 431 int c, match; 432 433 while (1) { 434 c = parse_peek(conf); 435 if (c == 0) 436 return (PE_EOF); 437 switch (mc) { 438 case CC_WHITESPACE: 439 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 440 break; 441 case CC_NONWHITESPACE: 442 if (c == '\n') 443 return (PE_EOL); 444 match = (c != ' ' && c != '\t') ? 1 : 0; 445 break; 446 default: 447 match = (c == mc) ? 1 : 0; 448 break; 449 } 450 if (match) 451 break; 452 parse_advance(conf); 453 } 454 return (0); 455 } 456 457 static int 458 parse_token(char **conf, char **tok) 459 { 460 char *p; 461 size_t len; 462 int error; 463 464 *tok = NULL; 465 error = parse_skipto(conf, CC_NONWHITESPACE); 466 if (error) 467 return (error); 468 p = *conf; 469 error = parse_skipto(conf, CC_WHITESPACE); 470 len = *conf - p; 471 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 472 bcopy(p, *tok, len); 473 return (0); 474 } 475 476 static void 477 parse_dir_ask_printenv(const char *var) 478 { 479 char *val; 480 481 val = kern_getenv(var); 482 if (val != NULL) { 483 printf(" %s=%s\n", var, val); 484 freeenv(val); 485 } 486 } 487 488 static int 489 parse_dir_ask(char **conf) 490 { 491 char name[80]; 492 char *mnt; 493 int error; 494 495 vfs_mountroot_wait(); 496 497 printf("\nLoader variables:\n"); 498 parse_dir_ask_printenv("vfs.root.mountfrom"); 499 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 500 501 printf("\nManual root filesystem specification:\n"); 502 printf(" <fstype>:<device> [options]\n"); 503 printf(" Mount <device> using filesystem <fstype>\n"); 504 printf(" and with the specified (optional) option list.\n"); 505 printf("\n"); 506 printf(" eg. ufs:/dev/da0s1a\n"); 507 printf(" zfs:tank\n"); 508 printf(" cd9660:/dev/cd0 ro\n"); 509 printf(" (which is equivalent to: "); 510 printf("mount -t cd9660 -o ro /dev/cd0 /)\n"); 511 printf("\n"); 512 printf(" ? List valid disk boot devices\n"); 513 printf(" . Yield 1 second (for background tasks)\n"); 514 printf(" <empty line> Abort manual input\n"); 515 516 do { 517 error = EINVAL; 518 printf("\nmountroot> "); 519 cngets(name, sizeof(name), GETS_ECHO); 520 if (name[0] == '\0') 521 break; 522 if (name[0] == '?' && name[1] == '\0') { 523 printf("\nList of GEOM managed disk devices:\n "); 524 g_dev_print(); 525 continue; 526 } 527 if (name[0] == '.' && name[1] == '\0') { 528 pause("rmask", hz); 529 continue; 530 } 531 mnt = name; 532 error = parse_mount(&mnt); 533 if (error == -1) 534 printf("Invalid file system specification.\n"); 535 } while (error != 0); 536 537 return (error); 538 } 539 540 static int 541 parse_dir_md(char **conf) 542 { 543 struct stat sb; 544 struct thread *td; 545 struct md_ioctl *mdio; 546 char *path, *tok; 547 int error, fd, len; 548 549 td = curthread; 550 551 error = parse_token(conf, &tok); 552 if (error) 553 return (error); 554 555 len = strlen(tok); 556 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 557 path = (void *)(mdio + 1); 558 bcopy(tok, path, len); 559 free(tok, M_TEMP); 560 561 /* Get file status. */ 562 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 563 if (error) 564 goto out; 565 566 /* Open /dev/mdctl so that we can attach/detach. */ 567 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 568 O_RDWR, 0); 569 if (error) 570 goto out; 571 572 fd = td->td_retval[0]; 573 mdio->md_version = MDIOVERSION; 574 mdio->md_type = MD_VNODE; 575 576 if (root_mount_mddev != -1) { 577 mdio->md_unit = root_mount_mddev; 578 DROP_GIANT(); 579 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 580 PICKUP_GIANT(); 581 /* Ignore errors. We don't care. */ 582 root_mount_mddev = -1; 583 } 584 585 mdio->md_file = (void *)(mdio + 1); 586 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 587 mdio->md_mediasize = sb.st_size; 588 mdio->md_unit = 0; 589 DROP_GIANT(); 590 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 591 PICKUP_GIANT(); 592 if (error) 593 goto out; 594 595 if (mdio->md_unit > 9) { 596 printf("rootmount: too many md units\n"); 597 mdio->md_file = NULL; 598 mdio->md_options = 0; 599 mdio->md_mediasize = 0; 600 DROP_GIANT(); 601 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 602 PICKUP_GIANT(); 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 error; 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 ma = NULL; 755 ma = mount_arg(ma, "fstype", fs, -1); 756 ma = mount_arg(ma, "fspath", "/", -1); 757 ma = mount_arg(ma, "from", dev, -1); 758 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 759 ma = mount_arg(ma, "ro", NULL, 0); 760 ma = parse_mountroot_options(ma, opts); 761 error = kernel_mount(ma, MNT_ROOTFS); 762 763 out: 764 if (error) { 765 printf("Mounting from %s:%s failed with error %d", 766 fs, dev, error); 767 if (errmsg[0] != '\0') 768 printf(": %s", errmsg); 769 printf(".\n"); 770 } 771 free(fs, M_TEMP); 772 free(errmsg, M_TEMP); 773 if (opts != NULL) 774 free(opts, M_TEMP); 775 /* kernel_mount can return -1 on error. */ 776 return ((error < 0) ? EDOOFUS : error); 777 } 778 #undef ERRMSGL 779 780 static int 781 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 782 { 783 struct mount *mp; 784 char *conf; 785 int error; 786 787 root_mount_mddev = -1; 788 789 retry: 790 conf = sbuf_data(sb); 791 mp = TAILQ_NEXT(mpdevfs, mnt_list); 792 error = (mp == NULL) ? 0 : EDOOFUS; 793 root_mount_onfail = A_CONTINUE; 794 while (mp == NULL) { 795 error = parse_skipto(&conf, CC_NONWHITESPACE); 796 if (error == PE_EOL) { 797 parse_advance(&conf); 798 continue; 799 } 800 if (error < 0) 801 break; 802 switch (parse_peek(&conf)) { 803 case '#': 804 error = parse_skipto(&conf, '\n'); 805 break; 806 case '.': 807 error = parse_directive(&conf); 808 break; 809 default: 810 error = parse_mount(&conf); 811 if (error == -1) { 812 printf("mountroot: invalid file system " 813 "specification.\n"); 814 error = 0; 815 } 816 break; 817 } 818 if (error < 0) 819 break; 820 /* Ignore any trailing garbage on the line. */ 821 if (parse_peek(&conf) != '\n') { 822 printf("mountroot: advancing to next directive...\n"); 823 (void)parse_skipto(&conf, '\n'); 824 } 825 mp = TAILQ_NEXT(mpdevfs, mnt_list); 826 } 827 if (mp != NULL) 828 return (0); 829 830 /* 831 * We failed to mount (a new) root. 832 */ 833 switch (root_mount_onfail) { 834 case A_CONTINUE: 835 break; 836 case A_PANIC: 837 panic("mountroot: unable to (re-)mount root."); 838 /* NOTREACHED */ 839 case A_RETRY: 840 goto retry; 841 case A_REBOOT: 842 kern_reboot(RB_NOSYNC); 843 /* NOTREACHED */ 844 } 845 846 return (error); 847 } 848 849 static void 850 vfs_mountroot_conf0(struct sbuf *sb) 851 { 852 char *s, *tok, *mnt, *opt; 853 int error; 854 855 sbuf_printf(sb, ".onfail panic\n"); 856 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 857 if (boothowto & RB_ASKNAME) 858 sbuf_printf(sb, ".ask\n"); 859 #ifdef ROOTDEVNAME 860 if (boothowto & RB_DFLTROOT) 861 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 862 #endif 863 if (boothowto & RB_CDROM) { 864 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 865 sbuf_printf(sb, ".timeout 0\n"); 866 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n"); 867 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 868 } 869 s = kern_getenv("vfs.root.mountfrom"); 870 if (s != NULL) { 871 opt = kern_getenv("vfs.root.mountfrom.options"); 872 tok = s; 873 error = parse_token(&tok, &mnt); 874 while (!error) { 875 sbuf_printf(sb, "%s %s\n", mnt, 876 (opt != NULL) ? opt : ""); 877 free(mnt, M_TEMP); 878 error = parse_token(&tok, &mnt); 879 } 880 if (opt != NULL) 881 freeenv(opt); 882 freeenv(s); 883 } 884 if (rootdevnames[0] != NULL) 885 sbuf_printf(sb, "%s\n", rootdevnames[0]); 886 if (rootdevnames[1] != NULL) 887 sbuf_printf(sb, "%s\n", rootdevnames[1]); 888 #ifdef ROOTDEVNAME 889 if (!(boothowto & RB_DFLTROOT)) 890 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 891 #endif 892 if (!(boothowto & RB_ASKNAME)) 893 sbuf_printf(sb, ".ask\n"); 894 } 895 896 static int 897 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 898 { 899 static char buf[128]; 900 struct nameidata nd; 901 off_t ofs; 902 ssize_t resid; 903 int error, flags, len; 904 905 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 906 flags = FREAD; 907 error = vn_open(&nd, &flags, 0, NULL); 908 if (error) 909 return (error); 910 911 NDFREE(&nd, NDF_ONLY_PNBUF); 912 ofs = 0; 913 len = sizeof(buf) - 1; 914 while (1) { 915 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 916 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 917 NOCRED, &resid, td); 918 if (error) 919 break; 920 if (resid == len) 921 break; 922 buf[len - resid] = 0; 923 sbuf_printf(sb, "%s", buf); 924 ofs += len - resid; 925 } 926 927 VOP_UNLOCK(nd.ni_vp, 0); 928 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 929 return (error); 930 } 931 932 static void 933 vfs_mountroot_wait(void) 934 { 935 struct root_hold_token *h; 936 struct timeval lastfail; 937 int curfail; 938 939 curfail = 0; 940 while (1) { 941 DROP_GIANT(); 942 g_waitidle(); 943 PICKUP_GIANT(); 944 mtx_lock(&root_holds_mtx); 945 if (LIST_EMPTY(&root_holds)) { 946 mtx_unlock(&root_holds_mtx); 947 break; 948 } 949 if (ppsratecheck(&lastfail, &curfail, 1)) { 950 printf("Root mount waiting for:"); 951 LIST_FOREACH(h, &root_holds, list) 952 printf(" %s", h->who); 953 printf("\n"); 954 } 955 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 956 hz); 957 } 958 } 959 960 static int 961 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev) 962 { 963 int delay, timeout; 964 965 /* 966 * In case of ZFS and NFS we don't have a way to wait for 967 * specific device. Also do the wait if the user forced that 968 * behaviour by setting vfs.root_mount_always_wait=1. 969 */ 970 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL || 971 dev[0] == '\0' || root_mount_always_wait != 0) { 972 vfs_mountroot_wait(); 973 return (0); 974 } 975 976 /* 977 * Otherwise, no point in waiting if the device is already there. 978 * Note that we must wait for GEOM to finish reconfiguring itself, 979 * eg for geom_part(4) to finish tasting. 980 */ 981 DROP_GIANT(); 982 g_waitidle(); 983 PICKUP_GIANT(); 984 if (parse_mount_dev_present(dev)) 985 return (0); 986 987 /* 988 * No luck. Let's wait. This code looks weird, but it's that way 989 * to behave exactly as it used to work before. 990 */ 991 vfs_mountroot_wait(); 992 printf("mountroot: waiting for device %s...\n", dev); 993 delay = hz / 10; 994 timeout = root_mount_timeout * hz; 995 do { 996 pause("rmdev", delay); 997 timeout -= delay; 998 } while (timeout > 0 && !parse_mount_dev_present(dev)); 999 1000 if (timeout <= 0) 1001 return (ENODEV); 1002 1003 return (0); 1004 } 1005 1006 void 1007 vfs_mountroot(void) 1008 { 1009 struct mount *mp; 1010 struct sbuf *sb; 1011 struct thread *td; 1012 time_t timebase; 1013 int error; 1014 1015 td = curthread; 1016 1017 sb = sbuf_new_auto(); 1018 vfs_mountroot_conf0(sb); 1019 sbuf_finish(sb); 1020 1021 error = vfs_mountroot_devfs(td, &mp); 1022 while (!error) { 1023 error = vfs_mountroot_parse(sb, mp); 1024 if (!error) { 1025 vfs_mountroot_shuffle(td, mp); 1026 sbuf_clear(sb); 1027 error = vfs_mountroot_readconf(td, sb); 1028 sbuf_finish(sb); 1029 } 1030 } 1031 1032 sbuf_delete(sb); 1033 1034 /* 1035 * Iterate over all currently mounted file systems and use 1036 * the time stamp found to check and/or initialize the RTC. 1037 * Call inittodr() only once and pass it the largest of the 1038 * timestamps we encounter. 1039 */ 1040 timebase = 0; 1041 mtx_lock(&mountlist_mtx); 1042 mp = TAILQ_FIRST(&mountlist); 1043 while (mp != NULL) { 1044 if (mp->mnt_time > timebase) 1045 timebase = mp->mnt_time; 1046 mp = TAILQ_NEXT(mp, mnt_list); 1047 } 1048 mtx_unlock(&mountlist_mtx); 1049 inittodr(timebase); 1050 1051 /* Keep prison0's root in sync with the global rootvnode. */ 1052 mtx_lock(&prison0.pr_mtx); 1053 prison0.pr_root = rootvnode; 1054 vref(prison0.pr_root); 1055 mtx_unlock(&prison0.pr_mtx); 1056 1057 mtx_lock(&root_holds_mtx); 1058 atomic_store_rel_int(&root_mount_complete, 1); 1059 wakeup(&root_mount_complete); 1060 mtx_unlock(&root_holds_mtx); 1061 1062 EVENTHANDLER_INVOKE(mountroot); 1063 } 1064 1065 static struct mntarg * 1066 parse_mountroot_options(struct mntarg *ma, const char *options) 1067 { 1068 char *p; 1069 char *name, *name_arg; 1070 char *val, *val_arg; 1071 char *opts; 1072 1073 if (options == NULL || options[0] == '\0') 1074 return (ma); 1075 1076 p = opts = strdup(options, M_MOUNT); 1077 if (opts == NULL) { 1078 return (ma); 1079 } 1080 1081 while((name = strsep(&p, ",")) != NULL) { 1082 if (name[0] == '\0') 1083 break; 1084 1085 val = strchr(name, '='); 1086 if (val != NULL) { 1087 *val = '\0'; 1088 ++val; 1089 } 1090 if( strcmp(name, "rw") == 0 || 1091 strcmp(name, "noro") == 0) { 1092 /* 1093 * The first time we mount the root file system, 1094 * we need to mount 'ro', so We need to ignore 1095 * 'rw' and 'noro' mount options. 1096 */ 1097 continue; 1098 } 1099 name_arg = strdup(name, M_MOUNT); 1100 val_arg = NULL; 1101 if (val != NULL) 1102 val_arg = strdup(val, M_MOUNT); 1103 1104 ma = mount_arg(ma, name_arg, val_arg, 1105 (val_arg != NULL ? -1 : 0)); 1106 } 1107 free(opts, M_MOUNT); 1108 return (ma); 1109 } 1110