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 KASSERT(h != NULL, ("%s: NULL token", __func__)); 187 188 mtx_lock(&root_holds_mtx); 189 LIST_REMOVE(h, list); 190 wakeup(&root_holds); 191 mtx_unlock(&root_holds_mtx); 192 free(h, M_DEVBUF); 193 } 194 195 int 196 root_mounted(void) 197 { 198 199 /* No mutex is acquired here because int stores are atomic. */ 200 return (root_mount_complete); 201 } 202 203 static void 204 set_rootvnode(void) 205 { 206 struct proc *p; 207 208 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 209 panic("Cannot find root vnode"); 210 211 VOP_UNLOCK(rootvnode, 0); 212 213 p = curthread->td_proc; 214 FILEDESC_XLOCK(p->p_fd); 215 216 if (p->p_fd->fd_cdir != NULL) 217 vrele(p->p_fd->fd_cdir); 218 p->p_fd->fd_cdir = rootvnode; 219 VREF(rootvnode); 220 221 if (p->p_fd->fd_rdir != NULL) 222 vrele(p->p_fd->fd_rdir); 223 p->p_fd->fd_rdir = rootvnode; 224 VREF(rootvnode); 225 226 FILEDESC_XUNLOCK(p->p_fd); 227 } 228 229 static int 230 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 231 { 232 struct vfsoptlist *opts; 233 struct vfsconf *vfsp; 234 struct mount *mp; 235 int error; 236 237 *mpp = NULL; 238 239 if (rootdevmp != NULL) { 240 /* 241 * Already have /dev; this happens during rerooting. 242 */ 243 error = vfs_busy(rootdevmp, 0); 244 if (error != 0) 245 return (error); 246 *mpp = rootdevmp; 247 } else { 248 vfsp = vfs_byname("devfs"); 249 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 250 if (vfsp == NULL) 251 return (ENOENT); 252 253 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 254 255 error = VFS_MOUNT(mp); 256 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 257 if (error) 258 return (error); 259 260 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 261 TAILQ_INIT(opts); 262 mp->mnt_opt = opts; 263 264 mtx_lock(&mountlist_mtx); 265 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 266 mtx_unlock(&mountlist_mtx); 267 268 *mpp = mp; 269 rootdevmp = mp; 270 } 271 272 set_rootvnode(); 273 274 error = kern_symlinkat(td, "/", AT_FDCWD, "dev", UIO_SYSSPACE); 275 if (error) 276 printf("kern_symlink /dev -> / returns %d\n", error); 277 278 return (error); 279 } 280 281 static void 282 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 283 { 284 struct nameidata nd; 285 struct mount *mporoot, *mpnroot; 286 struct vnode *vp, *vporoot, *vpdevfs; 287 char *fspath; 288 int error; 289 290 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 291 292 /* Shuffle the mountlist. */ 293 mtx_lock(&mountlist_mtx); 294 mporoot = TAILQ_FIRST(&mountlist); 295 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 296 if (mporoot != mpdevfs) { 297 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 298 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 299 } 300 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 301 mtx_unlock(&mountlist_mtx); 302 303 cache_purgevfs(mporoot, true); 304 if (mporoot != mpdevfs) 305 cache_purgevfs(mpdevfs, true); 306 307 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 308 309 VI_LOCK(vporoot); 310 vporoot->v_iflag &= ~VI_MOUNT; 311 VI_UNLOCK(vporoot); 312 vporoot->v_mountedhere = NULL; 313 mporoot->mnt_flag &= ~MNT_ROOTFS; 314 mporoot->mnt_vnodecovered = NULL; 315 vput(vporoot); 316 317 /* Set up the new rootvnode, and purge the cache */ 318 mpnroot->mnt_vnodecovered = NULL; 319 set_rootvnode(); 320 cache_purgevfs(rootvnode->v_mount, true); 321 322 if (mporoot != mpdevfs) { 323 /* Remount old root under /.mount or /mnt */ 324 fspath = "/.mount"; 325 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 326 fspath, td); 327 error = namei(&nd); 328 if (error) { 329 NDFREE(&nd, NDF_ONLY_PNBUF); 330 fspath = "/mnt"; 331 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 332 fspath, td); 333 error = namei(&nd); 334 } 335 if (!error) { 336 vp = nd.ni_vp; 337 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 338 if (!error) 339 error = vinvalbuf(vp, V_SAVE, 0, 0); 340 if (!error) { 341 cache_purge(vp); 342 mporoot->mnt_vnodecovered = vp; 343 vp->v_mountedhere = mporoot; 344 strlcpy(mporoot->mnt_stat.f_mntonname, 345 fspath, MNAMELEN); 346 VOP_UNLOCK(vp, 0); 347 } else 348 vput(vp); 349 } 350 NDFREE(&nd, NDF_ONLY_PNBUF); 351 352 if (error) 353 printf("mountroot: unable to remount previous root " 354 "under /.mount or /mnt (error %d)\n", error); 355 } 356 357 /* Remount devfs under /dev */ 358 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 359 error = namei(&nd); 360 if (!error) { 361 vp = nd.ni_vp; 362 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 363 if (!error) 364 error = vinvalbuf(vp, V_SAVE, 0, 0); 365 if (!error) { 366 vpdevfs = mpdevfs->mnt_vnodecovered; 367 if (vpdevfs != NULL) { 368 cache_purge(vpdevfs); 369 vpdevfs->v_mountedhere = NULL; 370 vrele(vpdevfs); 371 } 372 mpdevfs->mnt_vnodecovered = vp; 373 vp->v_mountedhere = mpdevfs; 374 VOP_UNLOCK(vp, 0); 375 } else 376 vput(vp); 377 } 378 if (error) 379 printf("mountroot: unable to remount devfs under /dev " 380 "(error %d)\n", error); 381 NDFREE(&nd, NDF_ONLY_PNBUF); 382 383 if (mporoot == mpdevfs) { 384 vfs_unbusy(mpdevfs); 385 /* Unlink the no longer needed /dev/dev -> / symlink */ 386 error = kern_unlinkat(td, AT_FDCWD, "/dev/dev", 387 UIO_SYSSPACE, 0); 388 if (error) 389 printf("mountroot: unable to unlink /dev/dev " 390 "(error %d)\n", error); 391 } 392 } 393 394 /* 395 * Configuration parser. 396 */ 397 398 /* Parser character classes. */ 399 #define CC_WHITESPACE -1 400 #define CC_NONWHITESPACE -2 401 402 /* Parse errors. */ 403 #define PE_EOF -1 404 #define PE_EOL -2 405 406 static __inline int 407 parse_peek(char **conf) 408 { 409 410 return (**conf); 411 } 412 413 static __inline void 414 parse_poke(char **conf, int c) 415 { 416 417 **conf = c; 418 } 419 420 static __inline void 421 parse_advance(char **conf) 422 { 423 424 (*conf)++; 425 } 426 427 static int 428 parse_skipto(char **conf, int mc) 429 { 430 int c, match; 431 432 while (1) { 433 c = parse_peek(conf); 434 if (c == 0) 435 return (PE_EOF); 436 switch (mc) { 437 case CC_WHITESPACE: 438 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 439 break; 440 case CC_NONWHITESPACE: 441 if (c == '\n') 442 return (PE_EOL); 443 match = (c != ' ' && c != '\t') ? 1 : 0; 444 break; 445 default: 446 match = (c == mc) ? 1 : 0; 447 break; 448 } 449 if (match) 450 break; 451 parse_advance(conf); 452 } 453 return (0); 454 } 455 456 static int 457 parse_token(char **conf, char **tok) 458 { 459 char *p; 460 size_t len; 461 int error; 462 463 *tok = NULL; 464 error = parse_skipto(conf, CC_NONWHITESPACE); 465 if (error) 466 return (error); 467 p = *conf; 468 error = parse_skipto(conf, CC_WHITESPACE); 469 len = *conf - p; 470 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 471 bcopy(p, *tok, len); 472 return (0); 473 } 474 475 static void 476 parse_dir_ask_printenv(const char *var) 477 { 478 char *val; 479 480 val = kern_getenv(var); 481 if (val != NULL) { 482 printf(" %s=%s\n", var, val); 483 freeenv(val); 484 } 485 } 486 487 static int 488 parse_dir_ask(char **conf) 489 { 490 char name[80]; 491 char *mnt; 492 int error; 493 494 vfs_mountroot_wait(); 495 496 printf("\nLoader variables:\n"); 497 parse_dir_ask_printenv("vfs.root.mountfrom"); 498 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 499 500 printf("\nManual root filesystem specification:\n"); 501 printf(" <fstype>:<device> [options]\n"); 502 printf(" Mount <device> using filesystem <fstype>\n"); 503 printf(" and with the specified (optional) option list.\n"); 504 printf("\n"); 505 printf(" eg. ufs:/dev/da0s1a\n"); 506 printf(" zfs:tank\n"); 507 printf(" cd9660:/dev/cd0 ro\n"); 508 printf(" (which is equivalent to: "); 509 printf("mount -t cd9660 -o ro /dev/cd0 /)\n"); 510 printf("\n"); 511 printf(" ? List valid disk boot devices\n"); 512 printf(" . Yield 1 second (for background tasks)\n"); 513 printf(" <empty line> Abort manual input\n"); 514 515 do { 516 error = EINVAL; 517 printf("\nmountroot> "); 518 cngets(name, sizeof(name), GETS_ECHO); 519 if (name[0] == '\0') 520 break; 521 if (name[0] == '?' && name[1] == '\0') { 522 printf("\nList of GEOM managed disk devices:\n "); 523 g_dev_print(); 524 continue; 525 } 526 if (name[0] == '.' && name[1] == '\0') { 527 pause("rmask", hz); 528 continue; 529 } 530 mnt = name; 531 error = parse_mount(&mnt); 532 if (error == -1) 533 printf("Invalid file system specification.\n"); 534 } while (error != 0); 535 536 return (error); 537 } 538 539 static int 540 parse_dir_md(char **conf) 541 { 542 struct stat sb; 543 struct thread *td; 544 struct md_ioctl *mdio; 545 char *path, *tok; 546 int error, fd, len; 547 548 td = curthread; 549 550 error = parse_token(conf, &tok); 551 if (error) 552 return (error); 553 554 len = strlen(tok); 555 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 556 path = (void *)(mdio + 1); 557 bcopy(tok, path, len); 558 free(tok, M_TEMP); 559 560 /* Get file status. */ 561 error = kern_statat(td, 0, AT_FDCWD, path, UIO_SYSSPACE, &sb, NULL); 562 if (error) 563 goto out; 564 565 /* Open /dev/mdctl so that we can attach/detach. */ 566 error = kern_openat(td, AT_FDCWD, "/dev/" MDCTL_NAME, UIO_SYSSPACE, 567 O_RDWR, 0); 568 if (error) 569 goto out; 570 571 fd = td->td_retval[0]; 572 mdio->md_version = MDIOVERSION; 573 mdio->md_type = MD_VNODE; 574 575 if (root_mount_mddev != -1) { 576 mdio->md_unit = root_mount_mddev; 577 DROP_GIANT(); 578 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 579 PICKUP_GIANT(); 580 /* Ignore errors. We don't care. */ 581 root_mount_mddev = -1; 582 } 583 584 mdio->md_file = (void *)(mdio + 1); 585 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 586 mdio->md_mediasize = sb.st_size; 587 mdio->md_unit = 0; 588 DROP_GIANT(); 589 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 590 PICKUP_GIANT(); 591 if (error) 592 goto out; 593 594 if (mdio->md_unit > 9) { 595 printf("rootmount: too many md units\n"); 596 mdio->md_file = NULL; 597 mdio->md_options = 0; 598 mdio->md_mediasize = 0; 599 DROP_GIANT(); 600 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 601 PICKUP_GIANT(); 602 /* Ignore errors. We don't care. */ 603 error = ERANGE; 604 goto out; 605 } 606 607 root_mount_mddev = mdio->md_unit; 608 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 609 610 error = kern_close(td, fd); 611 612 out: 613 free(mdio, M_TEMP); 614 return (error); 615 } 616 617 static int 618 parse_dir_onfail(char **conf) 619 { 620 char *action; 621 int error; 622 623 error = parse_token(conf, &action); 624 if (error) 625 return (error); 626 627 if (!strcmp(action, "continue")) 628 root_mount_onfail = A_CONTINUE; 629 else if (!strcmp(action, "panic")) 630 root_mount_onfail = A_PANIC; 631 else if (!strcmp(action, "reboot")) 632 root_mount_onfail = A_REBOOT; 633 else if (!strcmp(action, "retry")) 634 root_mount_onfail = A_RETRY; 635 else { 636 printf("rootmount: %s: unknown action\n", action); 637 error = EINVAL; 638 } 639 640 free(action, M_TEMP); 641 return (0); 642 } 643 644 static int 645 parse_dir_timeout(char **conf) 646 { 647 char *tok, *endtok; 648 long secs; 649 int error; 650 651 error = parse_token(conf, &tok); 652 if (error) 653 return (error); 654 655 secs = strtol(tok, &endtok, 0); 656 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 657 if (!error) 658 root_mount_timeout = secs; 659 free(tok, M_TEMP); 660 return (error); 661 } 662 663 static int 664 parse_directive(char **conf) 665 { 666 char *dir; 667 int error; 668 669 error = parse_token(conf, &dir); 670 if (error) 671 return (error); 672 673 if (strcmp(dir, ".ask") == 0) 674 error = parse_dir_ask(conf); 675 else if (strcmp(dir, ".md") == 0) 676 error = parse_dir_md(conf); 677 else if (strcmp(dir, ".onfail") == 0) 678 error = parse_dir_onfail(conf); 679 else if (strcmp(dir, ".timeout") == 0) 680 error = parse_dir_timeout(conf); 681 else { 682 printf("mountroot: invalid directive `%s'\n", dir); 683 /* Ignore the rest of the line. */ 684 (void)parse_skipto(conf, '\n'); 685 error = EINVAL; 686 } 687 free(dir, M_TEMP); 688 return (error); 689 } 690 691 static int 692 parse_mount_dev_present(const char *dev) 693 { 694 struct nameidata nd; 695 int error; 696 697 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 698 error = namei(&nd); 699 if (!error) 700 vput(nd.ni_vp); 701 NDFREE(&nd, NDF_ONLY_PNBUF); 702 return (error != 0) ? 0 : 1; 703 } 704 705 #define ERRMSGL 255 706 static int 707 parse_mount(char **conf) 708 { 709 char *errmsg; 710 struct mntarg *ma; 711 char *dev, *fs, *opts, *tok; 712 int error; 713 714 error = parse_token(conf, &tok); 715 if (error) 716 return (error); 717 fs = tok; 718 error = parse_skipto(&tok, ':'); 719 if (error) { 720 free(fs, M_TEMP); 721 return (error); 722 } 723 parse_poke(&tok, '\0'); 724 parse_advance(&tok); 725 dev = tok; 726 727 if (root_mount_mddev != -1) { 728 /* Handle substitution for the md unit number. */ 729 tok = strstr(dev, "md#"); 730 if (tok != NULL) 731 tok[2] = '0' + root_mount_mddev; 732 } 733 734 /* Parse options. */ 735 error = parse_token(conf, &tok); 736 opts = (error == 0) ? tok : NULL; 737 738 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 739 (opts != NULL) ? opts : ""); 740 741 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 742 743 if (vfs_byname(fs) == NULL) { 744 strlcpy(errmsg, "unknown file system", ERRMSGL); 745 error = ENOENT; 746 goto out; 747 } 748 749 error = vfs_mountroot_wait_if_neccessary(fs, dev); 750 if (error != 0) 751 goto out; 752 753 ma = NULL; 754 ma = mount_arg(ma, "fstype", fs, -1); 755 ma = mount_arg(ma, "fspath", "/", -1); 756 ma = mount_arg(ma, "from", dev, -1); 757 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 758 ma = mount_arg(ma, "ro", NULL, 0); 759 ma = parse_mountroot_options(ma, opts); 760 error = kernel_mount(ma, MNT_ROOTFS); 761 762 out: 763 if (error) { 764 printf("Mounting from %s:%s failed with error %d", 765 fs, dev, error); 766 if (errmsg[0] != '\0') 767 printf(": %s", errmsg); 768 printf(".\n"); 769 } 770 free(fs, M_TEMP); 771 free(errmsg, M_TEMP); 772 if (opts != NULL) 773 free(opts, M_TEMP); 774 /* kernel_mount can return -1 on error. */ 775 return ((error < 0) ? EDOOFUS : error); 776 } 777 #undef ERRMSGL 778 779 static int 780 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 781 { 782 struct mount *mp; 783 char *conf; 784 int error; 785 786 root_mount_mddev = -1; 787 788 retry: 789 conf = sbuf_data(sb); 790 mp = TAILQ_NEXT(mpdevfs, mnt_list); 791 error = (mp == NULL) ? 0 : EDOOFUS; 792 root_mount_onfail = A_CONTINUE; 793 while (mp == NULL) { 794 error = parse_skipto(&conf, CC_NONWHITESPACE); 795 if (error == PE_EOL) { 796 parse_advance(&conf); 797 continue; 798 } 799 if (error < 0) 800 break; 801 switch (parse_peek(&conf)) { 802 case '#': 803 error = parse_skipto(&conf, '\n'); 804 break; 805 case '.': 806 error = parse_directive(&conf); 807 break; 808 default: 809 error = parse_mount(&conf); 810 if (error == -1) { 811 printf("mountroot: invalid file system " 812 "specification.\n"); 813 error = 0; 814 } 815 break; 816 } 817 if (error < 0) 818 break; 819 /* Ignore any trailing garbage on the line. */ 820 if (parse_peek(&conf) != '\n') { 821 printf("mountroot: advancing to next directive...\n"); 822 (void)parse_skipto(&conf, '\n'); 823 } 824 mp = TAILQ_NEXT(mpdevfs, mnt_list); 825 } 826 if (mp != NULL) 827 return (0); 828 829 /* 830 * We failed to mount (a new) root. 831 */ 832 switch (root_mount_onfail) { 833 case A_CONTINUE: 834 break; 835 case A_PANIC: 836 panic("mountroot: unable to (re-)mount root."); 837 /* NOTREACHED */ 838 case A_RETRY: 839 goto retry; 840 case A_REBOOT: 841 kern_reboot(RB_NOSYNC); 842 /* NOTREACHED */ 843 } 844 845 return (error); 846 } 847 848 static void 849 vfs_mountroot_conf0(struct sbuf *sb) 850 { 851 char *s, *tok, *mnt, *opt; 852 int error; 853 854 sbuf_printf(sb, ".onfail panic\n"); 855 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 856 if (boothowto & RB_ASKNAME) 857 sbuf_printf(sb, ".ask\n"); 858 #ifdef ROOTDEVNAME 859 if (boothowto & RB_DFLTROOT) 860 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 861 #endif 862 if (boothowto & RB_CDROM) { 863 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 864 sbuf_printf(sb, ".timeout 0\n"); 865 sbuf_printf(sb, "cd9660:/dev/cd1 ro\n"); 866 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 867 } 868 s = kern_getenv("vfs.root.mountfrom"); 869 if (s != NULL) { 870 opt = kern_getenv("vfs.root.mountfrom.options"); 871 tok = s; 872 error = parse_token(&tok, &mnt); 873 while (!error) { 874 sbuf_printf(sb, "%s %s\n", mnt, 875 (opt != NULL) ? opt : ""); 876 free(mnt, M_TEMP); 877 error = parse_token(&tok, &mnt); 878 } 879 if (opt != NULL) 880 freeenv(opt); 881 freeenv(s); 882 } 883 if (rootdevnames[0] != NULL) 884 sbuf_printf(sb, "%s\n", rootdevnames[0]); 885 if (rootdevnames[1] != NULL) 886 sbuf_printf(sb, "%s\n", rootdevnames[1]); 887 #ifdef ROOTDEVNAME 888 if (!(boothowto & RB_DFLTROOT)) 889 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 890 #endif 891 if (!(boothowto & RB_ASKNAME)) 892 sbuf_printf(sb, ".ask\n"); 893 } 894 895 static int 896 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 897 { 898 static char buf[128]; 899 struct nameidata nd; 900 off_t ofs; 901 ssize_t resid; 902 int error, flags, len; 903 904 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 905 flags = FREAD; 906 error = vn_open(&nd, &flags, 0, NULL); 907 if (error) 908 return (error); 909 910 NDFREE(&nd, NDF_ONLY_PNBUF); 911 ofs = 0; 912 len = sizeof(buf) - 1; 913 while (1) { 914 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 915 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 916 NOCRED, &resid, td); 917 if (error) 918 break; 919 if (resid == len) 920 break; 921 buf[len - resid] = 0; 922 sbuf_printf(sb, "%s", buf); 923 ofs += len - resid; 924 } 925 926 VOP_UNLOCK(nd.ni_vp, 0); 927 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 928 return (error); 929 } 930 931 static void 932 vfs_mountroot_wait(void) 933 { 934 struct root_hold_token *h; 935 struct timeval lastfail; 936 int curfail; 937 938 curfail = 0; 939 while (1) { 940 DROP_GIANT(); 941 g_waitidle(); 942 PICKUP_GIANT(); 943 mtx_lock(&root_holds_mtx); 944 if (LIST_EMPTY(&root_holds)) { 945 mtx_unlock(&root_holds_mtx); 946 break; 947 } 948 if (ppsratecheck(&lastfail, &curfail, 1)) { 949 printf("Root mount waiting for:"); 950 LIST_FOREACH(h, &root_holds, list) 951 printf(" %s", h->who); 952 printf("\n"); 953 } 954 msleep(&root_holds, &root_holds_mtx, PZERO | PDROP, "roothold", 955 hz); 956 } 957 } 958 959 static int 960 vfs_mountroot_wait_if_neccessary(const char *fs, const char *dev) 961 { 962 int delay, timeout; 963 964 /* 965 * In case of ZFS and NFS we don't have a way to wait for 966 * specific device. Also do the wait if the user forced that 967 * behaviour by setting vfs.root_mount_always_wait=1. 968 */ 969 if (strcmp(fs, "zfs") == 0 || strstr(fs, "nfs") != NULL || 970 dev[0] == '\0' || root_mount_always_wait != 0) { 971 vfs_mountroot_wait(); 972 return (0); 973 } 974 975 /* 976 * Otherwise, no point in waiting if the device is already there. 977 * Note that we must wait for GEOM to finish reconfiguring itself, 978 * eg for geom_part(4) to finish tasting. 979 */ 980 DROP_GIANT(); 981 g_waitidle(); 982 PICKUP_GIANT(); 983 if (parse_mount_dev_present(dev)) 984 return (0); 985 986 /* 987 * No luck. Let's wait. This code looks weird, but it's that way 988 * to behave exactly as it used to work before. 989 */ 990 vfs_mountroot_wait(); 991 printf("mountroot: waiting for device %s...\n", dev); 992 delay = hz / 10; 993 timeout = root_mount_timeout * hz; 994 do { 995 pause("rmdev", delay); 996 timeout -= delay; 997 } while (timeout > 0 && !parse_mount_dev_present(dev)); 998 999 if (timeout <= 0) 1000 return (ENODEV); 1001 1002 return (0); 1003 } 1004 1005 void 1006 vfs_mountroot(void) 1007 { 1008 struct mount *mp; 1009 struct sbuf *sb; 1010 struct thread *td; 1011 time_t timebase; 1012 int error; 1013 1014 td = curthread; 1015 1016 sb = sbuf_new_auto(); 1017 vfs_mountroot_conf0(sb); 1018 sbuf_finish(sb); 1019 1020 error = vfs_mountroot_devfs(td, &mp); 1021 while (!error) { 1022 error = vfs_mountroot_parse(sb, mp); 1023 if (!error) { 1024 vfs_mountroot_shuffle(td, mp); 1025 sbuf_clear(sb); 1026 error = vfs_mountroot_readconf(td, sb); 1027 sbuf_finish(sb); 1028 } 1029 } 1030 1031 sbuf_delete(sb); 1032 1033 /* 1034 * Iterate over all currently mounted file systems and use 1035 * the time stamp found to check and/or initialize the RTC. 1036 * Call inittodr() only once and pass it the largest of the 1037 * timestamps we encounter. 1038 */ 1039 timebase = 0; 1040 mtx_lock(&mountlist_mtx); 1041 mp = TAILQ_FIRST(&mountlist); 1042 while (mp != NULL) { 1043 if (mp->mnt_time > timebase) 1044 timebase = mp->mnt_time; 1045 mp = TAILQ_NEXT(mp, mnt_list); 1046 } 1047 mtx_unlock(&mountlist_mtx); 1048 inittodr(timebase); 1049 1050 /* Keep prison0's root in sync with the global rootvnode. */ 1051 mtx_lock(&prison0.pr_mtx); 1052 prison0.pr_root = rootvnode; 1053 vref(prison0.pr_root); 1054 mtx_unlock(&prison0.pr_mtx); 1055 1056 mtx_lock(&root_holds_mtx); 1057 atomic_store_rel_int(&root_mount_complete, 1); 1058 wakeup(&root_mount_complete); 1059 mtx_unlock(&root_holds_mtx); 1060 1061 EVENTHANDLER_INVOKE(mountroot); 1062 } 1063 1064 static struct mntarg * 1065 parse_mountroot_options(struct mntarg *ma, const char *options) 1066 { 1067 char *p; 1068 char *name, *name_arg; 1069 char *val, *val_arg; 1070 char *opts; 1071 1072 if (options == NULL || options[0] == '\0') 1073 return (ma); 1074 1075 p = opts = strdup(options, M_MOUNT); 1076 if (opts == NULL) { 1077 return (ma); 1078 } 1079 1080 while((name = strsep(&p, ",")) != NULL) { 1081 if (name[0] == '\0') 1082 break; 1083 1084 val = strchr(name, '='); 1085 if (val != NULL) { 1086 *val = '\0'; 1087 ++val; 1088 } 1089 if( strcmp(name, "rw") == 0 || 1090 strcmp(name, "noro") == 0) { 1091 /* 1092 * The first time we mount the root file system, 1093 * we need to mount 'ro', so We need to ignore 1094 * 'rw' and 'noro' mount options. 1095 */ 1096 continue; 1097 } 1098 name_arg = strdup(name, M_MOUNT); 1099 val_arg = NULL; 1100 if (val != NULL) 1101 val_arg = strdup(val, M_MOUNT); 1102 1103 ma = mount_arg(ma, name_arg, val_arg, 1104 (val_arg != NULL ? -1 : 0)); 1105 } 1106 free(opts, M_MOUNT); 1107 return (ma); 1108 } 1109