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 SYSCTL_PROC(_vfs, OID_AUTO, root_mount_hold, 136 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, 137 NULL, 0, sysctl_vfs_root_mount_hold, "A", 138 "List of root mount hold tokens"); 139 140 static int 141 sysctl_vfs_root_mount_hold(SYSCTL_HANDLER_ARGS) 142 { 143 struct sbuf sb; 144 struct root_hold_token *h; 145 int error; 146 147 sbuf_new(&sb, NULL, 256, SBUF_AUTOEXTEND | SBUF_INCLUDENUL); 148 149 mtx_lock(&root_holds_mtx); 150 LIST_FOREACH(h, &root_holds, list) { 151 if (h != LIST_FIRST(&root_holds)) 152 sbuf_putc(&sb, ' '); 153 sbuf_printf(&sb, "%s", h->who); 154 } 155 mtx_unlock(&root_holds_mtx); 156 157 error = sbuf_finish(&sb); 158 if (error == 0) 159 error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb)); 160 sbuf_delete(&sb); 161 return (error); 162 } 163 164 struct root_hold_token * 165 root_mount_hold(const char *identifier) 166 { 167 struct root_hold_token *h; 168 169 if (root_mounted()) 170 return (NULL); 171 172 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 173 h->who = identifier; 174 mtx_lock(&root_holds_mtx); 175 LIST_INSERT_HEAD(&root_holds, h, list); 176 mtx_unlock(&root_holds_mtx); 177 return (h); 178 } 179 180 void 181 root_mount_rel(struct root_hold_token *h) 182 { 183 184 if (h == NULL) 185 return; 186 mtx_lock(&root_holds_mtx); 187 LIST_REMOVE(h, list); 188 wakeup(&root_holds); 189 mtx_unlock(&root_holds_mtx); 190 free(h, M_DEVBUF); 191 } 192 193 int 194 root_mounted(void) 195 { 196 197 /* No mutex is acquired here because int stores are atomic. */ 198 return (root_mount_complete); 199 } 200 201 static void 202 set_rootvnode(void) 203 { 204 struct proc *p; 205 206 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 207 panic("Cannot find root vnode"); 208 209 VOP_UNLOCK(rootvnode, 0); 210 211 p = curthread->td_proc; 212 FILEDESC_XLOCK(p->p_fd); 213 214 if (p->p_fd->fd_cdir != NULL) 215 vrele(p->p_fd->fd_cdir); 216 p->p_fd->fd_cdir = rootvnode; 217 VREF(rootvnode); 218 219 if (p->p_fd->fd_rdir != NULL) 220 vrele(p->p_fd->fd_rdir); 221 p->p_fd->fd_rdir = rootvnode; 222 VREF(rootvnode); 223 224 FILEDESC_XUNLOCK(p->p_fd); 225 } 226 227 static int 228 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 229 { 230 struct vfsoptlist *opts; 231 struct vfsconf *vfsp; 232 struct mount *mp; 233 int error; 234 235 *mpp = NULL; 236 237 if (rootdevmp != NULL) { 238 /* 239 * Already have /dev; this happens during rerooting. 240 */ 241 error = vfs_busy(rootdevmp, 0); 242 if (error != 0) 243 return (error); 244 *mpp = rootdevmp; 245 } else { 246 vfsp = vfs_byname("devfs"); 247 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 248 if (vfsp == NULL) 249 return (ENOENT); 250 251 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 252 253 error = VFS_MOUNT(mp); 254 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 255 if (error) 256 return (error); 257 258 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 259 TAILQ_INIT(opts); 260 mp->mnt_opt = opts; 261 262 mtx_lock(&mountlist_mtx); 263 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 264 mtx_unlock(&mountlist_mtx); 265 266 *mpp = mp; 267 rootdevmp = mp; 268 } 269 270 set_rootvnode(); 271 272 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 273 if (error) 274 printf("kern_symlink /dev -> / returns %d\n", error); 275 276 return (error); 277 } 278 279 static void 280 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 281 { 282 struct nameidata nd; 283 struct mount *mporoot, *mpnroot; 284 struct vnode *vp, *vporoot, *vpdevfs; 285 char *fspath; 286 int error; 287 288 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 289 290 /* Shuffle the mountlist. */ 291 mtx_lock(&mountlist_mtx); 292 mporoot = TAILQ_FIRST(&mountlist); 293 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 294 if (mporoot != mpdevfs) { 295 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 296 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 297 } 298 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 299 mtx_unlock(&mountlist_mtx); 300 301 cache_purgevfs(mporoot); 302 if (mporoot != mpdevfs) 303 cache_purgevfs(mpdevfs); 304 305 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 306 307 VI_LOCK(vporoot); 308 vporoot->v_iflag &= ~VI_MOUNT; 309 VI_UNLOCK(vporoot); 310 vporoot->v_mountedhere = NULL; 311 mporoot->mnt_flag &= ~MNT_ROOTFS; 312 mporoot->mnt_vnodecovered = NULL; 313 vput(vporoot); 314 315 /* Set up the new rootvnode, and purge the cache */ 316 mpnroot->mnt_vnodecovered = NULL; 317 set_rootvnode(); 318 cache_purgevfs(rootvnode->v_mount); 319 320 if (mporoot != mpdevfs) { 321 /* Remount old root under /.mount or /mnt */ 322 fspath = "/.mount"; 323 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 324 fspath, td); 325 error = namei(&nd); 326 if (error) { 327 NDFREE(&nd, NDF_ONLY_PNBUF); 328 fspath = "/mnt"; 329 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 330 fspath, td); 331 error = namei(&nd); 332 } 333 if (!error) { 334 vp = nd.ni_vp; 335 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 336 if (!error) 337 error = vinvalbuf(vp, V_SAVE, 0, 0); 338 if (!error) { 339 cache_purge(vp); 340 mporoot->mnt_vnodecovered = vp; 341 vp->v_mountedhere = mporoot; 342 strlcpy(mporoot->mnt_stat.f_mntonname, 343 fspath, MNAMELEN); 344 VOP_UNLOCK(vp, 0); 345 } else 346 vput(vp); 347 } 348 NDFREE(&nd, NDF_ONLY_PNBUF); 349 350 if (error) 351 printf("mountroot: unable to remount previous root " 352 "under /.mount or /mnt (error %d)\n", error); 353 } 354 355 /* Remount devfs under /dev */ 356 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 357 error = namei(&nd); 358 if (!error) { 359 vp = nd.ni_vp; 360 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 361 if (!error) 362 error = vinvalbuf(vp, V_SAVE, 0, 0); 363 if (!error) { 364 vpdevfs = mpdevfs->mnt_vnodecovered; 365 if (vpdevfs != NULL) { 366 cache_purge(vpdevfs); 367 vpdevfs->v_mountedhere = NULL; 368 vrele(vpdevfs); 369 } 370 mpdevfs->mnt_vnodecovered = vp; 371 vp->v_mountedhere = mpdevfs; 372 VOP_UNLOCK(vp, 0); 373 } else 374 vput(vp); 375 } 376 if (error) 377 printf("mountroot: unable to remount devfs under /dev " 378 "(error %d)\n", error); 379 NDFREE(&nd, NDF_ONLY_PNBUF); 380 381 if (mporoot == mpdevfs) { 382 vfs_unbusy(mpdevfs); 383 /* Unlink the no longer needed /dev/dev -> / symlink */ 384 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 385 UIO_SYSSPACE, 0); 386 if (error) 387 printf("mountroot: unable to unlink /dev/dev " 388 "(error %d)\n", error); 389 } 390 } 391 392 /* 393 * Configuration parser. 394 */ 395 396 /* Parser character classes. */ 397 #define CC_WHITESPACE -1 398 #define CC_NONWHITESPACE -2 399 400 /* Parse errors. */ 401 #define PE_EOF -1 402 #define PE_EOL -2 403 404 static __inline int 405 parse_peek(char **conf) 406 { 407 408 return (**conf); 409 } 410 411 static __inline void 412 parse_poke(char **conf, int c) 413 { 414 415 **conf = c; 416 } 417 418 static __inline void 419 parse_advance(char **conf) 420 { 421 422 (*conf)++; 423 } 424 425 static int 426 parse_skipto(char **conf, int mc) 427 { 428 int c, match; 429 430 while (1) { 431 c = parse_peek(conf); 432 if (c == 0) 433 return (PE_EOF); 434 switch (mc) { 435 case CC_WHITESPACE: 436 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 437 break; 438 case CC_NONWHITESPACE: 439 if (c == '\n') 440 return (PE_EOL); 441 match = (c != ' ' && c != '\t') ? 1 : 0; 442 break; 443 default: 444 match = (c == mc) ? 1 : 0; 445 break; 446 } 447 if (match) 448 break; 449 parse_advance(conf); 450 } 451 return (0); 452 } 453 454 static int 455 parse_token(char **conf, char **tok) 456 { 457 char *p; 458 size_t len; 459 int error; 460 461 *tok = NULL; 462 error = parse_skipto(conf, CC_NONWHITESPACE); 463 if (error) 464 return (error); 465 p = *conf; 466 error = parse_skipto(conf, CC_WHITESPACE); 467 len = *conf - p; 468 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 469 bcopy(p, *tok, len); 470 return (0); 471 } 472 473 static void 474 parse_dir_ask_printenv(const char *var) 475 { 476 char *val; 477 478 val = kern_getenv(var); 479 if (val != NULL) { 480 printf(" %s=%s\n", var, val); 481 freeenv(val); 482 } 483 } 484 485 static int 486 parse_dir_ask(char **conf) 487 { 488 char name[80]; 489 char *mnt; 490 int error; 491 492 vfs_mountroot_wait(); 493 494 printf("\nLoader variables:\n"); 495 parse_dir_ask_printenv("vfs.root.mountfrom"); 496 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 497 498 printf("\nManual root filesystem specification:\n"); 499 printf(" <fstype>:<device> [options]\n"); 500 printf(" Mount <device> using filesystem <fstype>\n"); 501 printf(" and with the specified (optional) option list.\n"); 502 printf("\n"); 503 printf(" eg. ufs:/dev/da0s1a\n"); 504 printf(" zfs:tank\n"); 505 printf(" cd9660:/dev/cd0 ro\n"); 506 printf(" (which is equivalent to: "); 507 printf("mount -t cd9660 -o ro /dev/cd0 /)\n"); 508 printf("\n"); 509 printf(" ? List valid disk boot devices\n"); 510 printf(" . Yield 1 second (for background tasks)\n"); 511 printf(" <empty line> Abort manual input\n"); 512 513 do { 514 error = EINVAL; 515 printf("\nmountroot> "); 516 cngets(name, sizeof(name), GETS_ECHO); 517 if (name[0] == '\0') 518 break; 519 if (name[0] == '?' && name[1] == '\0') { 520 printf("\nList of GEOM managed disk devices:\n "); 521 g_dev_print(); 522 continue; 523 } 524 if (name[0] == '.' && name[1] == '\0') { 525 pause("rmask", hz); 526 continue; 527 } 528 mnt = name; 529 error = parse_mount(&mnt); 530 if (error == -1) 531 printf("Invalid file system specification.\n"); 532 } while (error != 0); 533 534 return (error); 535 } 536 537 static int 538 parse_dir_md(char **conf) 539 { 540 struct stat sb; 541 struct thread *td; 542 struct md_ioctl *mdio; 543 char *path, *tok; 544 int error, fd, len; 545 546 td = curthread; 547 548 error = parse_token(conf, &tok); 549 if (error) 550 return (error); 551 552 len = strlen(tok); 553 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 554 path = (void *)(mdio + 1); 555 bcopy(tok, path, len); 556 free(tok, M_TEMP); 557 558 /* Get file status. */ 559 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 560 if (error) 561 goto out; 562 563 /* Open /dev/mdctl so that we can attach/detach. */ 564 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 565 O_RDWR, 0); 566 if (error) 567 goto out; 568 569 fd = td->td_retval[0]; 570 mdio->md_version = MDIOVERSION; 571 mdio->md_type = MD_VNODE; 572 573 if (root_mount_mddev != -1) { 574 mdio->md_unit = root_mount_mddev; 575 DROP_GIANT(); 576 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 577 PICKUP_GIANT(); 578 /* Ignore errors. We don't care. */ 579 root_mount_mddev = -1; 580 } 581 582 mdio->md_file = (void *)(mdio + 1); 583 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 584 mdio->md_mediasize = sb.st_size; 585 mdio->md_unit = 0; 586 DROP_GIANT(); 587 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 588 PICKUP_GIANT(); 589 if (error) 590 goto out; 591 592 if (mdio->md_unit > 9) { 593 printf("rootmount: too many md units\n"); 594 mdio->md_file = NULL; 595 mdio->md_options = 0; 596 mdio->md_mediasize = 0; 597 DROP_GIANT(); 598 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 599 PICKUP_GIANT(); 600 /* Ignore errors. We don't care. */ 601 error = ERANGE; 602 goto out; 603 } 604 605 root_mount_mddev = mdio->md_unit; 606 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 607 608 error = kern_close(td, fd); 609 610 out: 611 free(mdio, M_TEMP); 612 return (error); 613 } 614 615 static int 616 parse_dir_onfail(char **conf) 617 { 618 char *action; 619 int error; 620 621 error = parse_token(conf, &action); 622 if (error) 623 return (error); 624 625 if (!strcmp(action, "continue")) 626 root_mount_onfail = A_CONTINUE; 627 else if (!strcmp(action, "panic")) 628 root_mount_onfail = A_PANIC; 629 else if (!strcmp(action, "reboot")) 630 root_mount_onfail = A_REBOOT; 631 else if (!strcmp(action, "retry")) 632 root_mount_onfail = A_RETRY; 633 else { 634 printf("rootmount: %s: unknown action\n", action); 635 error = EINVAL; 636 } 637 638 free(action, M_TEMP); 639 return (0); 640 } 641 642 static int 643 parse_dir_timeout(char **conf) 644 { 645 char *tok, *endtok; 646 long secs; 647 int error; 648 649 error = parse_token(conf, &tok); 650 if (error) 651 return (error); 652 653 secs = strtol(tok, &endtok, 0); 654 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 655 if (!error) 656 root_mount_timeout = secs; 657 free(tok, M_TEMP); 658 return (error); 659 } 660 661 static int 662 parse_directive(char **conf) 663 { 664 char *dir; 665 int error; 666 667 error = parse_token(conf, &dir); 668 if (error) 669 return (error); 670 671 if (strcmp(dir, ".ask") == 0) 672 error = parse_dir_ask(conf); 673 else if (strcmp(dir, ".md") == 0) 674 error = parse_dir_md(conf); 675 else if (strcmp(dir, ".onfail") == 0) 676 error = parse_dir_onfail(conf); 677 else if (strcmp(dir, ".timeout") == 0) 678 error = parse_dir_timeout(conf); 679 else { 680 printf("mountroot: invalid directive `%s'\n", dir); 681 /* Ignore the rest of the line. */ 682 (void)parse_skipto(conf, '\n'); 683 error = EINVAL; 684 } 685 free(dir, M_TEMP); 686 return (error); 687 } 688 689 static int 690 parse_mount_dev_present(const char *dev) 691 { 692 struct nameidata nd; 693 int error; 694 695 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 696 error = namei(&nd); 697 if (!error) 698 vput(nd.ni_vp); 699 NDFREE(&nd, NDF_ONLY_PNBUF); 700 return (error != 0) ? 0 : 1; 701 } 702 703 #define ERRMSGL 255 704 static int 705 parse_mount(char **conf) 706 { 707 char *errmsg; 708 struct mntarg *ma; 709 char *dev, *fs, *opts, *tok; 710 int error; 711 712 error = parse_token(conf, &tok); 713 if (error) 714 return (error); 715 fs = tok; 716 error = parse_skipto(&tok, ':'); 717 if (error) { 718 free(fs, M_TEMP); 719 return (error); 720 } 721 parse_poke(&tok, '\0'); 722 parse_advance(&tok); 723 dev = tok; 724 725 if (root_mount_mddev != -1) { 726 /* Handle substitution for the md unit number. */ 727 tok = strstr(dev, "md#"); 728 if (tok != NULL) 729 tok[2] = '0' + root_mount_mddev; 730 } 731 732 /* Parse options. */ 733 error = parse_token(conf, &tok); 734 opts = (error == 0) ? tok : NULL; 735 736 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 737 (opts != NULL) ? opts : ""); 738 739 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 740 741 if (vfs_byname(fs) == NULL) { 742 strlcpy(errmsg, "unknown file system", ERRMSGL); 743 error = ENOENT; 744 goto out; 745 } 746 747 error = vfs_mountroot_wait_if_neccessary(fs, dev); 748 if (error != 0) 749 goto out; 750 751 ma = NULL; 752 ma = mount_arg(ma, "fstype", fs, -1); 753 ma = mount_arg(ma, "fspath", "/", -1); 754 ma = mount_arg(ma, "from", dev, -1); 755 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 756 ma = mount_arg(ma, "ro", NULL, 0); 757 ma = parse_mountroot_options(ma, opts); 758 error = kernel_mount(ma, MNT_ROOTFS); 759 760 out: 761 if (error) { 762 printf("Mounting from %s:%s failed with error %d", 763 fs, dev, error); 764 if (errmsg[0] != '\0') 765 printf(": %s", errmsg); 766 printf(".\n"); 767 } 768 free(fs, M_TEMP); 769 free(errmsg, M_TEMP); 770 if (opts != NULL) 771 free(opts, M_TEMP); 772 /* kernel_mount can return -1 on error. */ 773 return ((error < 0) ? EDOOFUS : error); 774 } 775 #undef ERRMSGL 776 777 static int 778 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 779 { 780 struct mount *mp; 781 char *conf; 782 int error; 783 784 root_mount_mddev = -1; 785 786 retry: 787 conf = sbuf_data(sb); 788 mp = TAILQ_NEXT(mpdevfs, mnt_list); 789 error = (mp == NULL) ? 0 : EDOOFUS; 790 root_mount_onfail = A_CONTINUE; 791 while (mp == NULL) { 792 error = parse_skipto(&conf, CC_NONWHITESPACE); 793 if (error == PE_EOL) { 794 parse_advance(&conf); 795 continue; 796 } 797 if (error < 0) 798 break; 799 switch (parse_peek(&conf)) { 800 case '#': 801 error = parse_skipto(&conf, '\n'); 802 break; 803 case '.': 804 error = parse_directive(&conf); 805 break; 806 default: 807 error = parse_mount(&conf); 808 if (error == -1) { 809 printf("mountroot: invalid file system " 810 "specification.\n"); 811 error = 0; 812 } 813 break; 814 } 815 if (error < 0) 816 break; 817 /* Ignore any trailing garbage on the line. */ 818 if (parse_peek(&conf) != '\n') { 819 printf("mountroot: advancing to next directive...\n"); 820 (void)parse_skipto(&conf, '\n'); 821 } 822 mp = TAILQ_NEXT(mpdevfs, mnt_list); 823 } 824 if (mp != NULL) 825 return (0); 826 827 /* 828 * We failed to mount (a new) root. 829 */ 830 switch (root_mount_onfail) { 831 case A_CONTINUE: 832 break; 833 case A_PANIC: 834 panic("mountroot: unable to (re-)mount root."); 835 /* NOTREACHED */ 836 case A_RETRY: 837 goto retry; 838 case A_REBOOT: 839 kern_reboot(RB_NOSYNC); 840 /* NOTREACHED */ 841 } 842 843 return (error); 844 } 845 846 static void 847 vfs_mountroot_conf0(struct sbuf *sb) 848 { 849 char *s, *tok, *mnt, *opt; 850 int error; 851 852 sbuf_printf(sb, ".onfail panic\n"); 853 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 854 if (boothowto & RB_ASKNAME) 855 sbuf_printf(sb, ".ask\n"); 856 #ifdef ROOTDEVNAME 857 if (boothowto & RB_DFLTROOT) 858 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 859 #endif 860 if (boothowto & RB_CDROM) { 861 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 862 sbuf_printf(sb, ".timeout 0\n"); 863 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n"); 864 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 865 } 866 s = kern_getenv("vfs.root.mountfrom"); 867 if (s != NULL) { 868 opt = kern_getenv("vfs.root.mountfrom.options"); 869 tok = s; 870 error = parse_token(&tok, &mnt); 871 while (!error) { 872 sbuf_printf(sb, "%s %s\n", mnt, 873 (opt != NULL) ? opt : ""); 874 free(mnt, M_TEMP); 875 error = parse_token(&tok, &mnt); 876 } 877 if (opt != NULL) 878 freeenv(opt); 879 freeenv(s); 880 } 881 if (rootdevnames[0] != NULL) 882 sbuf_printf(sb, "%s\n", rootdevnames[0]); 883 if (rootdevnames[1] != NULL) 884 sbuf_printf(sb, "%s\n", rootdevnames[1]); 885 #ifdef ROOTDEVNAME 886 if (!(boothowto & RB_DFLTROOT)) 887 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 888 #endif 889 if (!(boothowto & RB_ASKNAME)) 890 sbuf_printf(sb, ".ask\n"); 891 } 892 893 static int 894 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 895 { 896 static char buf[128]; 897 struct nameidata nd; 898 off_t ofs; 899 ssize_t resid; 900 int error, flags, len; 901 902 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 903 flags = FREAD; 904 error = vn_open(&nd, &flags, 0, NULL); 905 if (error) 906 return (error); 907 908 NDFREE(&nd, NDF_ONLY_PNBUF); 909 ofs = 0; 910 len = sizeof(buf) - 1; 911 while (1) { 912 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 913 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 914 NOCRED, &resid, td); 915 if (error) 916 break; 917 if (resid == len) 918 break; 919 buf[len - resid] = 0; 920 sbuf_printf(sb, "%s", buf); 921 ofs += len - resid; 922 } 923 924 VOP_UNLOCK(nd.ni_vp, 0); 925 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 926 return (error); 927 } 928 929 static void 930 vfs_mountroot_wait(void) 931 { 932 struct root_hold_token *h; 933 struct timeval lastfail; 934 int curfail; 935 936 curfail = 0; 937 while (1) { 938 DROP_GIANT(); 939 g_waitidle(); 940 PICKUP_GIANT(); 941 mtx_lock(&root_holds_mtx); 942 if (LIST_EMPTY(&root_holds)) { 943 mtx_unlock(&root_holds_mtx); 944 break; 945 } 946 if (ppsratecheck(&lastfail, &curfail, 1)) { 947 printf("Root mount waiting for:"); 948 LIST_FOREACH(h, &root_holds, list) 949 printf(" %s", h->who); 950 printf("\n"); 951 } 952 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 953 hz); 954 } 955 } 956 957 static int 958 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev) 959 { 960 int delay, timeout; 961 962 /* 963 * In case of ZFS and NFS we don't have a way to wait for 964 * specific device. 965 */ 966 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL || 967 dev[0] == '\0') { 968 vfs_mountroot_wait(); 969 return (0); 970 } 971 972 /* 973 * Otherwise, no point in waiting if the device is already there. 974 * Note that we must wait for GEOM to finish reconfiguring itself, 975 * eg for geom_part(4) to finish tasting. 976 */ 977 DROP_GIANT(); 978 g_waitidle(); 979 PICKUP_GIANT(); 980 if (parse_mount_dev_present(dev)) 981 return (0); 982 983 /* 984 * No luck. Let's wait. This code looks weird, but it's that way 985 * to behave exactly as it used to work before. 986 */ 987 vfs_mountroot_wait(); 988 printf("mountroot: waiting for device %s...\n", dev); 989 delay = hz / 10; 990 timeout = root_mount_timeout * hz; 991 do { 992 pause("rmdev", delay); 993 timeout -= delay; 994 } while (timeout > 0 && !parse_mount_dev_present(dev)); 995 996 if (timeout <= 0) 997 return (ENODEV); 998 999 return (0); 1000 } 1001 1002 void 1003 vfs_mountroot(void) 1004 { 1005 struct mount *mp; 1006 struct sbuf *sb; 1007 struct thread *td; 1008 time_t timebase; 1009 int error; 1010 1011 td = curthread; 1012 1013 sb = sbuf_new_auto(); 1014 vfs_mountroot_conf0(sb); 1015 sbuf_finish(sb); 1016 1017 error = vfs_mountroot_devfs(td, &mp); 1018 while (!error) { 1019 error = vfs_mountroot_parse(sb, mp); 1020 if (!error) { 1021 vfs_mountroot_shuffle(td, mp); 1022 sbuf_clear(sb); 1023 error = vfs_mountroot_readconf(td, sb); 1024 sbuf_finish(sb); 1025 } 1026 } 1027 1028 sbuf_delete(sb); 1029 1030 /* 1031 * Iterate over all currently mounted file systems and use 1032 * the time stamp found to check and/or initialize the RTC. 1033 * Call inittodr() only once and pass it the largest of the 1034 * timestamps we encounter. 1035 */ 1036 timebase = 0; 1037 mtx_lock(&mountlist_mtx); 1038 mp = TAILQ_FIRST(&mountlist); 1039 while (mp != NULL) { 1040 if (mp->mnt_time > timebase) 1041 timebase = mp->mnt_time; 1042 mp = TAILQ_NEXT(mp, mnt_list); 1043 } 1044 mtx_unlock(&mountlist_mtx); 1045 inittodr(timebase); 1046 1047 /* Keep prison0's root in sync with the global rootvnode. */ 1048 mtx_lock(&prison0.pr_mtx); 1049 prison0.pr_root = rootvnode; 1050 vref(prison0.pr_root); 1051 mtx_unlock(&prison0.pr_mtx); 1052 1053 mtx_lock(&root_holds_mtx); 1054 atomic_store_rel_int(&root_mount_complete, 1); 1055 wakeup(&root_mount_complete); 1056 mtx_unlock(&root_holds_mtx); 1057 1058 EVENTHANDLER_INVOKE(mountroot); 1059 } 1060 1061 static struct mntarg * 1062 parse_mountroot_options(struct mntarg *ma, const char *options) 1063 { 1064 char *p; 1065 char *name, *name_arg; 1066 char *val, *val_arg; 1067 char *opts; 1068 1069 if (options == NULL || options[0] == '\0') 1070 return (ma); 1071 1072 p = opts = strdup(options, M_MOUNT); 1073 if (opts == NULL) { 1074 return (ma); 1075 } 1076 1077 while((name = strsep(&p, ",")) != NULL) { 1078 if (name[0] == '\0') 1079 break; 1080 1081 val = strchr(name, '='); 1082 if (val != NULL) { 1083 *val = '\0'; 1084 ++val; 1085 } 1086 if( strcmp(name, "rw") == 0 || 1087 strcmp(name, "noro") == 0) { 1088 /* 1089 * The first time we mount the root file system, 1090 * we need to mount 'ro', so We need to ignore 1091 * 'rw' and 'noro' mount options. 1092 */ 1093 continue; 1094 } 1095 name_arg = strdup(name, M_MOUNT); 1096 val_arg = NULL; 1097 if (val != NULL) 1098 val_arg = strdup(val, M_MOUNT); 1099 1100 ma = mount_arg(ma, name_arg, val_arg, 1101 (val_arg != NULL ? -1 : 0)); 1102 } 1103 free(opts, M_MOUNT); 1104 return (ma); 1105 } 1106