Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_mountroot.c
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1 /*- 2 * Copyright (c) 2010 Marcel Moolenaar 3 * Copyright (c) 1999-2004 Poul-Henning Kamp 4 * Copyright (c) 1999 Michael Smith 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include "opt_rootdevname.h" 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD: releng/10.0/sys/kern/vfs_mountroot.c 255412 2013-09-09 05:01:18Z delphij $"); 42 43 #include <sys/param.h> 44 #include <sys/conf.h> 45 #include <sys/cons.h> 46 #include <sys/fcntl.h> 47 #include <sys/jail.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/mdioctl.h> 51 #include <sys/mount.h> 52 #include <sys/mutex.h> 53 #include <sys/namei.h> 54 #include <sys/priv.h> 55 #include <sys/proc.h> 56 #include <sys/filedesc.h> 57 #include <sys/reboot.h> 58 #include <sys/sbuf.h> 59 #include <sys/stat.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysproto.h> 62 #include <sys/sx.h> 63 #include <sys/sysctl.h> 64 #include <sys/sysent.h> 65 #include <sys/systm.h> 66 #include <sys/vnode.h> 67 68 #include <geom/geom.h> 69 70 /* 71 * The root filesystem is detailed in the kernel environment variable 72 * vfs.root.mountfrom, which is expected to be in the general format 73 * 74 * <vfsname>:[<path>][ <vfsname>:[<path>] ...] 75 * vfsname := the name of a VFS known to the kernel and capable 76 * of being mounted as root 77 * path := disk device name or other data used by the filesystem 78 * to locate its physical store 79 * 80 * If the environment variable vfs.root.mountfrom is a space separated list, 81 * each list element is tried in turn and the root filesystem will be mounted 82 * from the first one that suceeds. 83 * 84 * The environment variable vfs.root.mountfrom.options is a comma delimited 85 * set of string mount options. These mount options must be parseable 86 * by nmount() in the kernel. 87 */ 88 89 static int parse_mount(char **); 90 static struct mntarg *parse_mountroot_options(struct mntarg *, const char *); 91 92 /* 93 * The vnode of the system's root (/ in the filesystem, without chroot 94 * active.) 95 */ 96 struct vnode *rootvnode; 97 98 char *rootdevnames[2] = {NULL, NULL}; 99 100 struct root_hold_token { 101 const char *who; 102 LIST_ENTRY(root_hold_token) list; 103 }; 104 105 static LIST_HEAD(, root_hold_token) root_holds = 106 LIST_HEAD_INITIALIZER(root_holds); 107 108 enum action { 109 A_CONTINUE, 110 A_PANIC, 111 A_REBOOT, 112 A_RETRY 113 }; 114 115 static enum action root_mount_onfail = A_CONTINUE; 116 117 static int root_mount_mddev; 118 static int root_mount_complete; 119 120 /* By default wait up to 3 seconds for devices to appear. */ 121 static int root_mount_timeout = 3; 122 TUNABLE_INT("vfs.mountroot.timeout", &root_mount_timeout); 123 124 struct root_hold_token * 125 root_mount_hold(const char *identifier) 126 { 127 struct root_hold_token *h; 128 129 if (root_mounted()) 130 return (NULL); 131 132 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 133 h->who = identifier; 134 mtx_lock(&mountlist_mtx); 135 LIST_INSERT_HEAD(&root_holds, h, list); 136 mtx_unlock(&mountlist_mtx); 137 return (h); 138 } 139 140 void 141 root_mount_rel(struct root_hold_token *h) 142 { 143 144 if (h == NULL) 145 return; 146 mtx_lock(&mountlist_mtx); 147 LIST_REMOVE(h, list); 148 wakeup(&root_holds); 149 mtx_unlock(&mountlist_mtx); 150 free(h, M_DEVBUF); 151 } 152 153 int 154 root_mounted(void) 155 { 156 157 /* No mutex is acquired here because int stores are atomic. */ 158 return (root_mount_complete); 159 } 160 161 void 162 root_mount_wait(void) 163 { 164 165 /* 166 * Panic on an obvious deadlock - the function can't be called from 167 * a thread which is doing the whole SYSINIT stuff. 168 */ 169 KASSERT(curthread->td_proc->p_pid != 0, 170 ("root_mount_wait: cannot be called from the swapper thread")); 171 mtx_lock(&mountlist_mtx); 172 while (!root_mount_complete) { 173 msleep(&root_mount_complete, &mountlist_mtx, PZERO, "rootwait", 174 hz); 175 } 176 mtx_unlock(&mountlist_mtx); 177 } 178 179 static void 180 set_rootvnode(void) 181 { 182 struct proc *p; 183 184 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 185 panic("Cannot find root vnode"); 186 187 VOP_UNLOCK(rootvnode, 0); 188 189 p = curthread->td_proc; 190 FILEDESC_XLOCK(p->p_fd); 191 192 if (p->p_fd->fd_cdir != NULL) 193 vrele(p->p_fd->fd_cdir); 194 p->p_fd->fd_cdir = rootvnode; 195 VREF(rootvnode); 196 197 if (p->p_fd->fd_rdir != NULL) 198 vrele(p->p_fd->fd_rdir); 199 p->p_fd->fd_rdir = rootvnode; 200 VREF(rootvnode); 201 202 FILEDESC_XUNLOCK(p->p_fd); 203 } 204 205 static int 206 vfs_mountroot_devfs(struct thread *td, struct mount **mpp) 207 { 208 struct vfsoptlist *opts; 209 struct vfsconf *vfsp; 210 struct mount *mp; 211 int error; 212 213 *mpp = NULL; 214 215 vfsp = vfs_byname("devfs"); 216 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 217 if (vfsp == NULL) 218 return (ENOENT); 219 220 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 221 222 error = VFS_MOUNT(mp); 223 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 224 if (error) 225 return (error); 226 227 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 228 TAILQ_INIT(opts); 229 mp->mnt_opt = opts; 230 231 mtx_lock(&mountlist_mtx); 232 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 233 mtx_unlock(&mountlist_mtx); 234 235 *mpp = mp; 236 set_rootvnode(); 237 238 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 239 if (error) 240 printf("kern_symlink /dev -> / returns %d\n", error); 241 242 return (error); 243 } 244 245 static int 246 vfs_mountroot_shuffle(struct thread *td, struct mount *mpdevfs) 247 { 248 struct nameidata nd; 249 struct mount *mporoot, *mpnroot; 250 struct vnode *vp, *vporoot, *vpdevfs; 251 char *fspath; 252 int error; 253 254 mpnroot = TAILQ_NEXT(mpdevfs, mnt_list); 255 256 /* Shuffle the mountlist. */ 257 mtx_lock(&mountlist_mtx); 258 mporoot = TAILQ_FIRST(&mountlist); 259 TAILQ_REMOVE(&mountlist, mpdevfs, mnt_list); 260 if (mporoot != mpdevfs) { 261 TAILQ_REMOVE(&mountlist, mpnroot, mnt_list); 262 TAILQ_INSERT_HEAD(&mountlist, mpnroot, mnt_list); 263 } 264 TAILQ_INSERT_TAIL(&mountlist, mpdevfs, mnt_list); 265 mtx_unlock(&mountlist_mtx); 266 267 cache_purgevfs(mporoot); 268 if (mporoot != mpdevfs) 269 cache_purgevfs(mpdevfs); 270 271 VFS_ROOT(mporoot, LK_EXCLUSIVE, &vporoot); 272 273 VI_LOCK(vporoot); 274 vporoot->v_iflag &= ~VI_MOUNT; 275 VI_UNLOCK(vporoot); 276 vporoot->v_mountedhere = NULL; 277 mporoot->mnt_flag &= ~MNT_ROOTFS; 278 mporoot->mnt_vnodecovered = NULL; 279 vput(vporoot); 280 281 /* Set up the new rootvnode, and purge the cache */ 282 mpnroot->mnt_vnodecovered = NULL; 283 set_rootvnode(); 284 cache_purgevfs(rootvnode->v_mount); 285 286 if (mporoot != mpdevfs) { 287 /* Remount old root under /.mount or /mnt */ 288 fspath = "/.mount"; 289 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 290 fspath, td); 291 error = namei(&nd); 292 if (error) { 293 NDFREE(&nd, NDF_ONLY_PNBUF); 294 fspath = "/mnt"; 295 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, 296 fspath, td); 297 error = namei(&nd); 298 } 299 if (!error) { 300 vp = nd.ni_vp; 301 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 302 if (!error) 303 error = vinvalbuf(vp, V_SAVE, 0, 0); 304 if (!error) { 305 cache_purge(vp); 306 mporoot->mnt_vnodecovered = vp; 307 vp->v_mountedhere = mporoot; 308 strlcpy(mporoot->mnt_stat.f_mntonname, 309 fspath, MNAMELEN); 310 VOP_UNLOCK(vp, 0); 311 } else 312 vput(vp); 313 } 314 NDFREE(&nd, NDF_ONLY_PNBUF); 315 316 if (error && bootverbose) 317 printf("mountroot: unable to remount previous root " 318 "under /.mount or /mnt (error %d).\n", error); 319 } 320 321 /* Remount devfs under /dev */ 322 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 323 error = namei(&nd); 324 if (!error) { 325 vp = nd.ni_vp; 326 error = (vp->v_type == VDIR) ? 0 : ENOTDIR; 327 if (!error) 328 error = vinvalbuf(vp, V_SAVE, 0, 0); 329 if (!error) { 330 vpdevfs = mpdevfs->mnt_vnodecovered; 331 if (vpdevfs != NULL) { 332 cache_purge(vpdevfs); 333 vpdevfs->v_mountedhere = NULL; 334 vrele(vpdevfs); 335 } 336 mpdevfs->mnt_vnodecovered = vp; 337 vp->v_mountedhere = mpdevfs; 338 VOP_UNLOCK(vp, 0); 339 } else 340 vput(vp); 341 } 342 if (error && bootverbose) 343 printf("mountroot: unable to remount devfs under /dev " 344 "(error %d).\n", error); 345 NDFREE(&nd, NDF_ONLY_PNBUF); 346 347 if (mporoot == mpdevfs) { 348 vfs_unbusy(mpdevfs); 349 /* Unlink the no longer needed /dev/dev -> / symlink */ 350 error = kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 351 if (error && bootverbose) 352 printf("mountroot: unable to unlink /dev/dev " 353 "(error %d)\n", error); 354 } 355 356 return (0); 357 } 358 359 /* 360 * Configuration parser. 361 */ 362 363 /* Parser character classes. */ 364 #define CC_WHITESPACE -1 365 #define CC_NONWHITESPACE -2 366 367 /* Parse errors. */ 368 #define PE_EOF -1 369 #define PE_EOL -2 370 371 static __inline int 372 parse_peek(char **conf) 373 { 374 375 return (**conf); 376 } 377 378 static __inline void 379 parse_poke(char **conf, int c) 380 { 381 382 **conf = c; 383 } 384 385 static __inline void 386 parse_advance(char **conf) 387 { 388 389 (*conf)++; 390 } 391 392 static __inline int 393 parse_isspace(int c) 394 { 395 396 return ((c == ' ' || c == '\t' || c == '\n') ? 1 : 0); 397 } 398 399 static int 400 parse_skipto(char **conf, int mc) 401 { 402 int c, match; 403 404 while (1) { 405 c = parse_peek(conf); 406 if (c == 0) 407 return (PE_EOF); 408 switch (mc) { 409 case CC_WHITESPACE: 410 match = (c == ' ' || c == '\t' || c == '\n') ? 1 : 0; 411 break; 412 case CC_NONWHITESPACE: 413 if (c == '\n') 414 return (PE_EOL); 415 match = (c != ' ' && c != '\t') ? 1 : 0; 416 break; 417 default: 418 match = (c == mc) ? 1 : 0; 419 break; 420 } 421 if (match) 422 break; 423 parse_advance(conf); 424 } 425 return (0); 426 } 427 428 static int 429 parse_token(char **conf, char **tok) 430 { 431 char *p; 432 size_t len; 433 int error; 434 435 *tok = NULL; 436 error = parse_skipto(conf, CC_NONWHITESPACE); 437 if (error) 438 return (error); 439 p = *conf; 440 error = parse_skipto(conf, CC_WHITESPACE); 441 len = *conf - p; 442 *tok = malloc(len + 1, M_TEMP, M_WAITOK | M_ZERO); 443 bcopy(p, *tok, len); 444 return (0); 445 } 446 447 static void 448 parse_dir_ask_printenv(const char *var) 449 { 450 char *val; 451 452 val = getenv(var); 453 if (val != NULL) { 454 printf(" %s=%s\n", var, val); 455 freeenv(val); 456 } 457 } 458 459 static int 460 parse_dir_ask(char **conf) 461 { 462 char name[80]; 463 char *mnt; 464 int error; 465 466 printf("\nLoader variables:\n"); 467 parse_dir_ask_printenv("vfs.root.mountfrom"); 468 parse_dir_ask_printenv("vfs.root.mountfrom.options"); 469 470 printf("\nManual root filesystem specification:\n"); 471 printf(" <fstype>:<device> [options]\n"); 472 printf(" Mount <device> using filesystem <fstype>\n"); 473 printf(" and with the specified (optional) option list.\n"); 474 printf("\n"); 475 printf(" eg. ufs:/dev/da0s1a\n"); 476 printf(" zfs:tank\n"); 477 printf(" cd9660:/dev/acd0 ro\n"); 478 printf(" (which is equivalent to: "); 479 printf("mount -t cd9660 -o ro /dev/acd0 /)\n"); 480 printf("\n"); 481 printf(" ? List valid disk boot devices\n"); 482 printf(" . Yield 1 second (for background tasks)\n"); 483 printf(" <empty line> Abort manual input\n"); 484 485 do { 486 error = EINVAL; 487 printf("\nmountroot> "); 488 cngets(name, sizeof(name), GETS_ECHO); 489 if (name[0] == '\0') 490 break; 491 if (name[0] == '?' && name[1] == '\0') { 492 printf("\nList of GEOM managed disk devices:\n "); 493 g_dev_print(); 494 continue; 495 } 496 if (name[0] == '.' && name[1] == '\0') { 497 pause("rmask", hz); 498 continue; 499 } 500 mnt = name; 501 error = parse_mount(&mnt); 502 if (error == -1) 503 printf("Invalid file system specification.\n"); 504 } while (error != 0); 505 506 return (error); 507 } 508 509 static int 510 parse_dir_md(char **conf) 511 { 512 struct stat sb; 513 struct thread *td; 514 struct md_ioctl *mdio; 515 char *path, *tok; 516 int error, fd, len; 517 518 td = curthread; 519 520 error = parse_token(conf, &tok); 521 if (error) 522 return (error); 523 524 len = strlen(tok); 525 mdio = malloc(sizeof(*mdio) + len + 1, M_TEMP, M_WAITOK | M_ZERO); 526 path = (void *)(mdio + 1); 527 bcopy(tok, path, len); 528 free(tok, M_TEMP); 529 530 /* Get file status. */ 531 error = kern_stat(td, path, UIO_SYSSPACE, &sb); 532 if (error) 533 goto out; 534 535 /* Open /dev/mdctl so that we can attach/detach. */ 536 error = kern_open(td, "/dev/" MDCTL_NAME, UIO_SYSSPACE, O_RDWR, 0); 537 if (error) 538 goto out; 539 540 fd = td->td_retval[0]; 541 mdio->md_version = MDIOVERSION; 542 mdio->md_type = MD_VNODE; 543 544 if (root_mount_mddev != -1) { 545 mdio->md_unit = root_mount_mddev; 546 DROP_GIANT(); 547 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 548 PICKUP_GIANT(); 549 /* Ignore errors. We don't care. */ 550 root_mount_mddev = -1; 551 } 552 553 mdio->md_file = (void *)(mdio + 1); 554 mdio->md_options = MD_AUTOUNIT | MD_READONLY; 555 mdio->md_mediasize = sb.st_size; 556 mdio->md_unit = 0; 557 DROP_GIANT(); 558 error = kern_ioctl(td, fd, MDIOCATTACH, (void *)mdio); 559 PICKUP_GIANT(); 560 if (error) 561 goto out; 562 563 if (mdio->md_unit > 9) { 564 printf("rootmount: too many md units\n"); 565 mdio->md_file = NULL; 566 mdio->md_options = 0; 567 mdio->md_mediasize = 0; 568 DROP_GIANT(); 569 error = kern_ioctl(td, fd, MDIOCDETACH, (void *)mdio); 570 PICKUP_GIANT(); 571 /* Ignore errors. We don't care. */ 572 error = ERANGE; 573 goto out; 574 } 575 576 root_mount_mddev = mdio->md_unit; 577 printf(MD_NAME "%u attached to %s\n", root_mount_mddev, mdio->md_file); 578 579 error = kern_close(td, fd); 580 581 out: 582 free(mdio, M_TEMP); 583 return (error); 584 } 585 586 static int 587 parse_dir_onfail(char **conf) 588 { 589 char *action; 590 int error; 591 592 error = parse_token(conf, &action); 593 if (error) 594 return (error); 595 596 if (!strcmp(action, "continue")) 597 root_mount_onfail = A_CONTINUE; 598 else if (!strcmp(action, "panic")) 599 root_mount_onfail = A_PANIC; 600 else if (!strcmp(action, "reboot")) 601 root_mount_onfail = A_REBOOT; 602 else if (!strcmp(action, "retry")) 603 root_mount_onfail = A_RETRY; 604 else { 605 printf("rootmount: %s: unknown action\n", action); 606 error = EINVAL; 607 } 608 609 free(action, M_TEMP); 610 return (0); 611 } 612 613 static int 614 parse_dir_timeout(char **conf) 615 { 616 char *tok, *endtok; 617 long secs; 618 int error; 619 620 error = parse_token(conf, &tok); 621 if (error) 622 return (error); 623 624 secs = strtol(tok, &endtok, 0); 625 error = (secs < 0 || *endtok != '\0') ? EINVAL : 0; 626 if (!error) 627 root_mount_timeout = secs; 628 free(tok, M_TEMP); 629 return (error); 630 } 631 632 static int 633 parse_directive(char **conf) 634 { 635 char *dir; 636 int error; 637 638 error = parse_token(conf, &dir); 639 if (error) 640 return (error); 641 642 if (strcmp(dir, ".ask") == 0) 643 error = parse_dir_ask(conf); 644 else if (strcmp(dir, ".md") == 0) 645 error = parse_dir_md(conf); 646 else if (strcmp(dir, ".onfail") == 0) 647 error = parse_dir_onfail(conf); 648 else if (strcmp(dir, ".timeout") == 0) 649 error = parse_dir_timeout(conf); 650 else { 651 printf("mountroot: invalid directive `%s'\n", dir); 652 /* Ignore the rest of the line. */ 653 (void)parse_skipto(conf, '\n'); 654 error = EINVAL; 655 } 656 free(dir, M_TEMP); 657 return (error); 658 } 659 660 static int 661 parse_mount_dev_present(const char *dev) 662 { 663 struct nameidata nd; 664 int error; 665 666 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, dev, curthread); 667 error = namei(&nd); 668 if (!error) 669 vput(nd.ni_vp); 670 NDFREE(&nd, NDF_ONLY_PNBUF); 671 return (error != 0) ? 0 : 1; 672 } 673 674 #define ERRMSGL 255 675 static int 676 parse_mount(char **conf) 677 { 678 char *errmsg; 679 struct mntarg *ma; 680 char *dev, *fs, *opts, *tok; 681 int delay, error, timeout; 682 683 error = parse_token(conf, &tok); 684 if (error) 685 return (error); 686 fs = tok; 687 error = parse_skipto(&tok, ':'); 688 if (error) { 689 free(fs, M_TEMP); 690 return (error); 691 } 692 parse_poke(&tok, '\0'); 693 parse_advance(&tok); 694 dev = tok; 695 696 if (root_mount_mddev != -1) { 697 /* Handle substitution for the md unit number. */ 698 tok = strstr(dev, "md#"); 699 if (tok != NULL) 700 tok[2] = '' + root_mount_mddev; 701 } 702 703 /* Parse options. */ 704 error = parse_token(conf, &tok); 705 opts = (error == 0) ? tok : NULL; 706 707 printf("Trying to mount root from %s:%s [%s]...\n", fs, dev, 708 (opts != NULL) ? opts : ""); 709 710 errmsg = malloc(ERRMSGL, M_TEMP, M_WAITOK | M_ZERO); 711 712 if (vfs_byname(fs) == NULL) { 713 strlcpy(errmsg, "unknown file system", ERRMSGL); 714 error = ENOENT; 715 goto out; 716 } 717 718 if (strcmp(fs, "zfs") != 0 && strstr(fs, "nfs") == NULL && 719 dev[0] != '\0' && !parse_mount_dev_present(dev)) { 720 printf("mountroot: waiting for device %s ...\n", dev); 721 delay = hz / 10; 722 timeout = root_mount_timeout * hz; 723 do { 724 pause("rmdev", delay); 725 timeout -= delay; 726 } while (timeout > 0 && !parse_mount_dev_present(dev)); 727 if (timeout <= 0) { 728 error = ENODEV; 729 goto out; 730 } 731 } 732 733 ma = NULL; 734 ma = mount_arg(ma, "fstype", fs, -1); 735 ma = mount_arg(ma, "fspath", "/", -1); 736 ma = mount_arg(ma, "from", dev, -1); 737 ma = mount_arg(ma, "errmsg", errmsg, ERRMSGL); 738 ma = mount_arg(ma, "ro", NULL, 0); 739 ma = parse_mountroot_options(ma, opts); 740 error = kernel_mount(ma, MNT_ROOTFS); 741 742 out: 743 if (error) { 744 printf("Mounting from %s:%s failed with error %d", 745 fs, dev, error); 746 if (errmsg[0] != '\0') 747 printf(": %s", errmsg); 748 printf(".\n"); 749 } 750 free(fs, M_TEMP); 751 free(errmsg, M_TEMP); 752 if (opts != NULL) 753 free(opts, M_TEMP); 754 /* kernel_mount can return -1 on error. */ 755 return ((error < 0) ? EDOOFUS : error); 756 } 757 #undef ERRMSGL 758 759 static int 760 vfs_mountroot_parse(struct sbuf *sb, struct mount *mpdevfs) 761 { 762 struct mount *mp; 763 char *conf; 764 int error; 765 766 root_mount_mddev = -1; 767 768 retry: 769 conf = sbuf_data(sb); 770 mp = TAILQ_NEXT(mpdevfs, mnt_list); 771 error = (mp == NULL) ? 0 : EDOOFUS; 772 root_mount_onfail = A_CONTINUE; 773 while (mp == NULL) { 774 error = parse_skipto(&conf, CC_NONWHITESPACE); 775 if (error == PE_EOL) { 776 parse_advance(&conf); 777 continue; 778 } 779 if (error < 0) 780 break; 781 switch (parse_peek(&conf)) { 782 case '#': 783 error = parse_skipto(&conf, '\n'); 784 break; 785 case '.': 786 error = parse_directive(&conf); 787 break; 788 default: 789 error = parse_mount(&conf); 790 break; 791 } 792 if (error < 0) 793 break; 794 /* Ignore any trailing garbage on the line. */ 795 if (parse_peek(&conf) != '\n') { 796 printf("mountroot: advancing to next directive...\n"); 797 (void)parse_skipto(&conf, '\n'); 798 } 799 mp = TAILQ_NEXT(mpdevfs, mnt_list); 800 } 801 if (mp != NULL) 802 return (0); 803 804 /* 805 * We failed to mount (a new) root. 806 */ 807 switch (root_mount_onfail) { 808 case A_CONTINUE: 809 break; 810 case A_PANIC: 811 panic("mountroot: unable to (re-)mount root."); 812 /* NOTREACHED */ 813 case A_RETRY: 814 goto retry; 815 case A_REBOOT: 816 kern_reboot(RB_NOSYNC); 817 /* NOTREACHED */ 818 } 819 820 return (error); 821 } 822 823 static void 824 vfs_mountroot_conf0(struct sbuf *sb) 825 { 826 char *s, *tok, *mnt, *opt; 827 int error; 828 829 sbuf_printf(sb, ".onfail panic\n"); 830 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 831 if (boothowto & RB_ASKNAME) 832 sbuf_printf(sb, ".ask\n"); 833 #ifdef ROOTDEVNAME 834 if (boothowto & RB_DFLTROOT) 835 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 836 #endif 837 if (boothowto & RB_CDROM) { 838 sbuf_printf(sb, "cd9660:/dev/cd0 ro\n"); 839 sbuf_printf(sb, ".timeout 0\n"); 840 sbuf_printf(sb, "cd9660:/dev/acd0 ro\n"); 841 sbuf_printf(sb, ".timeout %d\n", root_mount_timeout); 842 } 843 s = getenv("vfs.root.mountfrom"); 844 if (s != NULL) { 845 opt = getenv("vfs.root.mountfrom.options"); 846 tok = s; 847 error = parse_token(&tok, &mnt); 848 while (!error) { 849 sbuf_printf(sb, "%s %s\n", mnt, 850 (opt != NULL) ? opt : ""); 851 free(mnt, M_TEMP); 852 error = parse_token(&tok, &mnt); 853 } 854 if (opt != NULL) 855 freeenv(opt); 856 freeenv(s); 857 } 858 if (rootdevnames[0] != NULL) 859 sbuf_printf(sb, "%s\n", rootdevnames[0]); 860 if (rootdevnames[1] != NULL) 861 sbuf_printf(sb, "%s\n", rootdevnames[1]); 862 #ifdef ROOTDEVNAME 863 if (!(boothowto & RB_DFLTROOT)) 864 sbuf_printf(sb, "%s\n", ROOTDEVNAME); 865 #endif 866 if (!(boothowto & RB_ASKNAME)) 867 sbuf_printf(sb, ".ask\n"); 868 } 869 870 static int 871 vfs_mountroot_readconf(struct thread *td, struct sbuf *sb) 872 { 873 static char buf[128]; 874 struct nameidata nd; 875 off_t ofs; 876 ssize_t resid; 877 int error, flags, len; 878 879 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/.mount.conf", td); 880 flags = FREAD; 881 error = vn_open(&nd, &flags, 0, NULL); 882 if (error) 883 return (error); 884 885 NDFREE(&nd, NDF_ONLY_PNBUF); 886 ofs = 0; 887 len = sizeof(buf) - 1; 888 while (1) { 889 error = vn_rdwr(UIO_READ, nd.ni_vp, buf, len, ofs, 890 UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, 891 NOCRED, &resid, td); 892 if (error) 893 break; 894 if (resid == len) 895 break; 896 buf[len - resid] = 0; 897 sbuf_printf(sb, "%s", buf); 898 ofs += len - resid; 899 } 900 901 VOP_UNLOCK(nd.ni_vp, 0); 902 vn_close(nd.ni_vp, FREAD, td->td_ucred, td); 903 return (error); 904 } 905 906 static void 907 vfs_mountroot_wait(void) 908 { 909 struct root_hold_token *h; 910 struct timeval lastfail; 911 int curfail; 912 913 curfail = 0; 914 while (1) { 915 DROP_GIANT(); 916 g_waitidle(); 917 PICKUP_GIANT(); 918 mtx_lock(&mountlist_mtx); 919 if (LIST_EMPTY(&root_holds)) { 920 mtx_unlock(&mountlist_mtx); 921 break; 922 } 923 if (ppsratecheck(&lastfail, &curfail, 1)) { 924 printf("Root mount waiting for:"); 925 LIST_FOREACH(h, &root_holds, list) 926 printf(" %s", h->who); 927 printf("\n"); 928 } 929 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 930 hz); 931 } 932 } 933 934 void 935 vfs_mountroot(void) 936 { 937 struct mount *mp; 938 struct sbuf *sb; 939 struct thread *td; 940 time_t timebase; 941 int error; 942 943 td = curthread; 944 945 vfs_mountroot_wait(); 946 947 sb = sbuf_new_auto(); 948 vfs_mountroot_conf0(sb); 949 sbuf_finish(sb); 950 951 error = vfs_mountroot_devfs(td, &mp); 952 while (!error) { 953 error = vfs_mountroot_parse(sb, mp); 954 if (!error) { 955 error = vfs_mountroot_shuffle(td, mp); 956 if (!error) { 957 sbuf_clear(sb); 958 error = vfs_mountroot_readconf(td, sb); 959 sbuf_finish(sb); 960 } 961 } 962 } 963 964 sbuf_delete(sb); 965 966 /* 967 * Iterate over all currently mounted file systems and use 968 * the time stamp found to check and/or initialize the RTC. 969 * Call inittodr() only once and pass it the largest of the 970 * timestamps we encounter. 971 */ 972 timebase = 0; 973 mtx_lock(&mountlist_mtx); 974 mp = TAILQ_FIRST(&mountlist); 975 while (mp != NULL) { 976 if (mp->mnt_time > timebase) 977 timebase = mp->mnt_time; 978 mp = TAILQ_NEXT(mp, mnt_list); 979 } 980 mtx_unlock(&mountlist_mtx); 981 inittodr(timebase); 982 983 /* Keep prison0's root in sync with the global rootvnode. */ 984 mtx_lock(&prison0.pr_mtx); 985 prison0.pr_root = rootvnode; 986 vref(prison0.pr_root); 987 mtx_unlock(&prison0.pr_mtx); 988 989 mtx_lock(&mountlist_mtx); 990 atomic_store_rel_int(&root_mount_complete, 1); 991 wakeup(&root_mount_complete); 992 mtx_unlock(&mountlist_mtx); 993 994 EVENTHANDLER_INVOKE(mountroot); 995 } 996 997 static struct mntarg * 998 parse_mountroot_options(struct mntarg *ma, const char *options) 999 { 1000 char *p; 1001 char *name, *name_arg; 1002 char *val, *val_arg; 1003 char *opts; 1004 1005 if (options == NULL || options[0] == '\0') 1006 return (ma); 1007 1008 p = opts = strdup(options, M_MOUNT); 1009 if (opts == NULL) { 1010 return (ma); 1011 } 1012 1013 while((name = strsep(&p, ",")) != NULL) { 1014 if (name[0] == '\0') 1015 break; 1016 1017 val = strchr(name, '='); 1018 if (val != NULL) { 1019 *val = '\0'; 1020 ++val; 1021 } 1022 if( strcmp(name, "rw") == 0 || 1023 strcmp(name, "noro") == 0) { 1024 /* 1025 * The first time we mount the root file system, 1026 * we need to mount 'ro', so We need to ignore 1027 * 'rw' and 'noro' mount options. 1028 */ 1029 continue; 1030 } 1031 name_arg = strdup(name, M_MOUNT); 1032 val_arg = NULL; 1033 if (val != NULL) 1034 val_arg = strdup(val, M_MOUNT); 1035 1036 ma = mount_arg(ma, name_arg, val_arg, 1037 (val_arg != NULL ? -1 : 0)); 1038 } 1039 free(opts, M_MOUNT); 1040 return (ma); 1041 }
Cache object: 6f28a6cc7ae8adad839ed8413c3f88d6
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