1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * Copyright (c) 1999 Michael Smith 39 * All rights reserved. 40 * Copyright (c) 1999 Poul-Henning Kamp 41 * All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include <sys/param.h> 69 #include <sys/conf.h> 70 #include <sys/cons.h> 71 #include <sys/kernel.h> 72 #include <sys/linker.h> 73 #include <sys/mac.h> 74 #include <sys/malloc.h> 75 #include <sys/mount.h> 76 #include <sys/mutex.h> 77 #include <sys/namei.h> 78 #include <sys/proc.h> 79 #include <sys/filedesc.h> 80 #include <sys/reboot.h> 81 #include <sys/sysproto.h> 82 #include <sys/sx.h> 83 #include <sys/sysctl.h> 84 #include <sys/sysent.h> 85 #include <sys/systm.h> 86 #include <sys/vnode.h> 87 88 #include <geom/geom.h> 89 90 #include <machine/stdarg.h> 91 92 #include "opt_rootdevname.h" 93 #include "opt_ddb.h" 94 #include "opt_mac.h" 95 96 #ifdef DDB 97 #include <ddb/ddb.h> 98 #endif 99 100 #define ROOTNAME "root_device" 101 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 102 103 static void checkdirs(struct vnode *olddp, struct vnode *newdp); 104 static void gets(char *cp); 105 static int vfs_domount(struct thread *td, const char *fstype, 106 char *fspath, int fsflags, void *fsdata, int compat); 107 static int vfs_mount_alloc(struct vnode *dvp, struct vfsconf *vfsp, 108 const char *fspath, struct thread *td, struct mount **mpp); 109 static int vfs_mountroot_ask(void); 110 static int vfs_mountroot_try(char *mountfrom); 111 static int vfs_nmount(struct thread *td, int fsflags, struct uio *fsopts); 112 113 static int usermount = 0; /* if 1, non-root can mount fs. */ 114 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, ""); 115 116 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 117 118 /* List of mounted filesystems. */ 119 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 120 121 /* For any iteration/modification of mountlist */ 122 struct mtx mountlist_mtx; 123 124 /* 125 * The vnode of the system's root (/ in the filesystem, without chroot 126 * active.) 127 */ 128 struct vnode *rootvnode; 129 130 /* 131 * The root filesystem is detailed in the kernel environment variable 132 * vfs.root.mountfrom, which is expected to be in the general format 133 * 134 * <vfsname>:[<path>] 135 * vfsname := the name of a VFS known to the kernel and capable 136 * of being mounted as root 137 * path := disk device name or other data used by the filesystem 138 * to locate its physical store 139 */ 140 141 /* 142 * The root specifiers we will try if RB_CDROM is specified. 143 */ 144 static char *cdrom_rootdevnames[] = { 145 "cd9660:cd0", 146 "cd9660:acd0", 147 NULL 148 }; 149 150 /* legacy find-root code */ 151 char *rootdevnames[2] = {NULL, NULL}; 152 static int setrootbyname(char *name); 153 dev_t rootdev = NODEV; 154 155 /* 156 * Has to be dynamic as the value of rootdev can change; however, it can't 157 * change after the root is mounted, so a user process can't access this 158 * sysctl until after the value is unchangeable. 159 */ 160 static int 161 sysctl_rootdev(SYSCTL_HANDLER_ARGS) 162 { 163 int error; 164 165 /* _RD prevents this from happening. */ 166 KASSERT(req->newptr == NULL, ("Attempt to change root device name")); 167 168 if (rootdev != NODEV) 169 error = sysctl_handle_string(oidp, rootdev->si_name, 0, req); 170 else 171 error = sysctl_handle_string(oidp, "", 0, req); 172 173 return (error); 174 } 175 176 SYSCTL_PROC(_kern, OID_AUTO, rootdev, CTLTYPE_STRING | CTLFLAG_RD, 177 0, 0, sysctl_rootdev, "A", "Root file system device"); 178 179 /* Remove one mount option. */ 180 static void 181 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 182 { 183 184 TAILQ_REMOVE(opts, opt, link); 185 free(opt->name, M_MOUNT); 186 if (opt->value != NULL) 187 free(opt->value, M_MOUNT); 188 #ifdef INVARIANTS 189 else if (opt->len != 0) 190 panic("%s: mount option with NULL value but length != 0", 191 __func__); 192 #endif 193 free(opt, M_MOUNT); 194 } 195 196 /* Release all resources related to the mount options. */ 197 static void 198 vfs_freeopts(struct vfsoptlist *opts) 199 { 200 struct vfsopt *opt; 201 202 while (!TAILQ_EMPTY(opts)) { 203 opt = TAILQ_FIRST(opts); 204 vfs_freeopt(opts, opt); 205 } 206 free(opts, M_MOUNT); 207 } 208 209 /* 210 * If a mount option is specified several times, 211 * (with or without the "no" prefix) only keep 212 * the last occurence of it. 213 */ 214 static void 215 vfs_sanitizeopts(struct vfsoptlist *opts) 216 { 217 struct vfsopt *opt, *opt2, *tmp; 218 int noopt; 219 220 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 221 if (strncmp(opt->name, "no", 2) == 0) 222 noopt = 1; 223 else 224 noopt = 0; 225 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 226 while (opt2 != NULL) { 227 if (strcmp(opt2->name, opt->name) == 0 || 228 (noopt && strcmp(opt->name + 2, opt2->name) == 0) || 229 (!noopt && strncmp(opt2->name, "no", 2) == 0 && 230 strcmp(opt2->name + 2, opt->name) == 0)) { 231 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 232 vfs_freeopt(opts, opt2); 233 opt2 = tmp; 234 } else { 235 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 236 } 237 } 238 } 239 } 240 241 /* 242 * Build a linked list of mount options from a struct uio. 243 */ 244 static int 245 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 246 { 247 struct vfsoptlist *opts; 248 struct vfsopt *opt; 249 size_t memused; 250 unsigned int i, iovcnt; 251 int error, namelen, optlen; 252 253 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 254 TAILQ_INIT(opts); 255 memused = 0; 256 iovcnt = auio->uio_iovcnt; 257 for (i = 0; i < iovcnt; i += 2) { 258 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 259 namelen = auio->uio_iov[i].iov_len; 260 optlen = auio->uio_iov[i + 1].iov_len; 261 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 262 opt->value = NULL; 263 opt->len = optlen; 264 265 /* 266 * Do this early, so jumps to "bad" will free the current 267 * option. 268 */ 269 TAILQ_INSERT_TAIL(opts, opt, link); 270 memused += sizeof(struct vfsopt) + optlen + namelen; 271 272 /* 273 * Avoid consuming too much memory, and attempts to overflow 274 * memused. 275 */ 276 if (memused > VFS_MOUNTARG_SIZE_MAX || 277 optlen > VFS_MOUNTARG_SIZE_MAX || 278 namelen > VFS_MOUNTARG_SIZE_MAX) { 279 error = EINVAL; 280 goto bad; 281 } 282 283 if (auio->uio_segflg == UIO_SYSSPACE) { 284 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 285 } else { 286 error = copyin(auio->uio_iov[i].iov_base, opt->name, 287 namelen); 288 if (error) 289 goto bad; 290 } 291 /* Ensure names are null-terminated strings. */ 292 if (opt->name[namelen - 1] != '\0') { 293 error = EINVAL; 294 goto bad; 295 } 296 if (optlen != 0) { 297 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 298 if (auio->uio_segflg == UIO_SYSSPACE) { 299 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 300 optlen); 301 } else { 302 error = copyin(auio->uio_iov[i + 1].iov_base, 303 opt->value, optlen); 304 if (error) 305 goto bad; 306 } 307 } 308 } 309 vfs_sanitizeopts(opts); 310 *options = opts; 311 return (0); 312 bad: 313 vfs_freeopts(opts); 314 return (error); 315 } 316 317 /* 318 * Merge the old mount options with the new ones passed 319 * in the MNT_UPDATE case. 320 */ 321 static void 322 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 323 { 324 struct vfsopt *opt, *opt2, *new; 325 326 TAILQ_FOREACH(opt, opts, link) { 327 /* 328 * Check that this option hasn't been redefined 329 * nor cancelled with a "no" mount option. 330 */ 331 opt2 = TAILQ_FIRST(toopts); 332 while (opt2 != NULL) { 333 if (strcmp(opt2->name, opt->name) == 0) 334 goto next; 335 if (strncmp(opt2->name, "no", 2) == 0 && 336 strcmp(opt2->name + 2, opt->name) == 0) { 337 vfs_freeopt(toopts, opt2); 338 goto next; 339 } 340 opt2 = TAILQ_NEXT(opt2, link); 341 } 342 /* We want this option, duplicate it. */ 343 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 344 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 345 strcpy(new->name, opt->name); 346 if (opt->len != 0) { 347 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 348 bcopy(opt->value, new->value, opt->len); 349 } else { 350 new->value = NULL; 351 } 352 new->len = opt->len; 353 TAILQ_INSERT_TAIL(toopts, new, link); 354 next: 355 continue; 356 } 357 } 358 359 /* 360 * New mount API. 361 */ 362 int 363 nmount(td, uap) 364 struct thread *td; 365 struct nmount_args /* { 366 struct iovec *iovp; 367 unsigned int iovcnt; 368 int flags; 369 } */ *uap; 370 { 371 struct uio auio; 372 struct iovec *iov, *needfree; 373 struct iovec aiov[UIO_SMALLIOV]; 374 unsigned int i; 375 int error; 376 u_int iovlen, iovcnt; 377 378 iovcnt = uap->iovcnt; 379 iovlen = iovcnt * sizeof (struct iovec); 380 /* 381 * Check that we have an even number of iovec's 382 * and that we have at least two options. 383 */ 384 if ((iovcnt & 1) || (iovcnt < 4) || (iovcnt > UIO_MAXIOV)) 385 return (EINVAL); 386 387 if (iovcnt > UIO_SMALLIOV) { 388 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 389 needfree = iov; 390 } else { 391 iov = aiov; 392 needfree = NULL; 393 } 394 auio.uio_iov = iov; 395 auio.uio_iovcnt = iovcnt; 396 auio.uio_segflg = UIO_USERSPACE; 397 if ((error = copyin(uap->iovp, iov, iovlen))) 398 goto finish; 399 400 for (i = 0; i < iovcnt; i++) { 401 if (iov->iov_len > MMAXOPTIONLEN) { 402 error = EINVAL; 403 goto finish; 404 } 405 iov++; 406 } 407 error = vfs_nmount(td, uap->flags, &auio); 408 finish: 409 if (needfree != NULL) 410 free(needfree, M_TEMP); 411 return (error); 412 } 413 414 int 415 kernel_mount(iovp, iovcnt, flags) 416 struct iovec *iovp; 417 unsigned int iovcnt; 418 int flags; 419 { 420 struct uio auio; 421 int error; 422 423 /* 424 * Check that we have an even number of iovec's 425 * and that we have at least two options. 426 */ 427 if ((iovcnt & 1) || (iovcnt < 4)) 428 return (EINVAL); 429 430 auio.uio_iov = iovp; 431 auio.uio_iovcnt = iovcnt; 432 auio.uio_segflg = UIO_SYSSPACE; 433 434 error = vfs_nmount(curthread, flags, &auio); 435 return (error); 436 } 437 438 int 439 kernel_vmount(int flags, ...) 440 { 441 struct iovec *iovp; 442 struct uio auio; 443 va_list ap; 444 unsigned int iovcnt, iovlen, len; 445 const char *cp; 446 char *buf, *pos; 447 size_t n; 448 int error, i; 449 450 len = 0; 451 va_start(ap, flags); 452 for (iovcnt = 0; (cp = va_arg(ap, const char *)) != NULL; iovcnt++) 453 len += strlen(cp) + 1; 454 va_end(ap); 455 456 if (iovcnt < 4 || iovcnt & 1) 457 return (EINVAL); 458 459 iovlen = iovcnt * sizeof (struct iovec); 460 MALLOC(iovp, struct iovec *, iovlen, M_MOUNT, M_WAITOK); 461 MALLOC(buf, char *, len, M_MOUNT, M_WAITOK); 462 pos = buf; 463 va_start(ap, flags); 464 for (i = 0; i < iovcnt; i++) { 465 cp = va_arg(ap, const char *); 466 copystr(cp, pos, len - (pos - buf), &n); 467 iovp[i].iov_base = pos; 468 iovp[i].iov_len = n; 469 pos += n; 470 } 471 va_end(ap); 472 473 auio.uio_iov = iovp; 474 auio.uio_iovcnt = iovcnt; 475 auio.uio_segflg = UIO_SYSSPACE; 476 477 error = vfs_nmount(curthread, flags, &auio); 478 FREE(iovp, M_MOUNT); 479 FREE(buf, M_MOUNT); 480 return (error); 481 } 482 483 /* 484 * Allocate and initialize the mount point struct. 485 */ 486 static int 487 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, 488 const char *fspath, struct thread *td, struct mount **mpp) 489 { 490 struct mount *mp; 491 492 mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO); 493 TAILQ_INIT(&mp->mnt_nvnodelist); 494 TAILQ_INIT(&mp->mnt_reservedvnlist); 495 mp->mnt_nvnodelistsize = 0; 496 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 497 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, LK_NOPAUSE); 498 vfs_busy(mp, LK_NOWAIT, 0, td); 499 mp->mnt_op = vfsp->vfc_vfsops; 500 mp->mnt_vfc = vfsp; 501 vfsp->vfc_refcount++; 502 mp->mnt_stat.f_type = vfsp->vfc_typenum; 503 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 504 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 505 mp->mnt_vnodecovered = vp; 506 mp->mnt_cred = crdup(td->td_ucred); 507 mp->mnt_stat.f_owner = td->td_ucred->cr_uid; 508 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 509 mp->mnt_iosize_max = DFLTPHYS; 510 #ifdef MAC 511 mac_init_mount(mp); 512 mac_create_mount(td->td_ucred, mp); 513 #endif 514 *mpp = mp; 515 return (0); 516 } 517 518 /* 519 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 520 */ 521 void 522 vfs_mount_destroy(struct mount *mp, struct thread *td) 523 { 524 525 mp->mnt_vfc->vfc_refcount--; 526 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) 527 panic("unmount: dangling vnode"); 528 vfs_unbusy(mp,td); 529 lockdestroy(&mp->mnt_lock); 530 mtx_destroy(&mp->mnt_mtx); 531 if (mp->mnt_kern_flag & MNTK_MWAIT) 532 wakeup(mp); 533 #ifdef MAC 534 mac_destroy_mount(mp); 535 #endif 536 if (mp->mnt_opt != NULL) 537 vfs_freeopts(mp->mnt_opt); 538 crfree(mp->mnt_cred); 539 free(mp, M_MOUNT); 540 } 541 542 static int 543 vfs_nmount(struct thread *td, int fsflags, struct uio *fsoptions) 544 { 545 struct vfsoptlist *optlist; 546 char *fstype, *fspath; 547 int error, fstypelen, fspathlen; 548 549 error = vfs_buildopts(fsoptions, &optlist); 550 if (error) 551 return (error); 552 553 /* 554 * We need these two options before the others, 555 * and they are mandatory for any filesystem. 556 * Ensure they are NUL terminated as well. 557 */ 558 fstypelen = 0; 559 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 560 if (error || fstype[fstypelen - 1] != '\0') { 561 error = EINVAL; 562 goto bail; 563 } 564 fspathlen = 0; 565 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 566 if (error || fspath[fspathlen - 1] != '\0') { 567 error = EINVAL; 568 goto bail; 569 } 570 571 /* 572 * Be ultra-paranoid about making sure the type and fspath 573 * variables will fit in our mp buffers, including the 574 * terminating NUL. 575 */ 576 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 577 error = ENAMETOOLONG; 578 goto bail; 579 } 580 581 error = vfs_domount(td, fstype, fspath, fsflags, optlist, 0); 582 bail: 583 if (error) 584 vfs_freeopts(optlist); 585 return (error); 586 } 587 588 /* 589 * Old mount API. 590 */ 591 #ifndef _SYS_SYSPROTO_H_ 592 struct mount_args { 593 char *type; 594 char *path; 595 int flags; 596 caddr_t data; 597 }; 598 #endif 599 /* ARGSUSED */ 600 int 601 mount(td, uap) 602 struct thread *td; 603 struct mount_args /* { 604 char *type; 605 char *path; 606 int flags; 607 caddr_t data; 608 } */ *uap; 609 { 610 char *fstype; 611 char *fspath; 612 int error; 613 614 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 615 fspath = malloc(MNAMELEN, M_TEMP, M_WAITOK); 616 617 /* 618 * vfs_mount() actually takes a kernel string for `type' and 619 * `path' now, so extract them. 620 */ 621 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 622 if (error == 0) 623 error = copyinstr(uap->path, fspath, MNAMELEN, NULL); 624 if (error == 0) 625 error = vfs_domount(td, fstype, fspath, uap->flags, 626 uap->data, 1); 627 free(fstype, M_TEMP); 628 free(fspath, M_TEMP); 629 return (error); 630 } 631 632 /* 633 * vfs_mount(): actually attempt a filesystem mount. 634 * 635 * This routine is designed to be a "generic" entry point for routines 636 * that wish to mount a filesystem. All parameters except `fsdata' are 637 * pointers into kernel space. `fsdata' is currently still a pointer 638 * into userspace. 639 */ 640 int 641 vfs_mount(td, fstype, fspath, fsflags, fsdata) 642 struct thread *td; 643 const char *fstype; 644 char *fspath; 645 int fsflags; 646 void *fsdata; 647 { 648 649 return (vfs_domount(td, fstype, fspath, fsflags, fsdata, 1)); 650 } 651 652 /* 653 * vfs_domount(): actually attempt a filesystem mount. 654 */ 655 static int 656 vfs_domount( 657 struct thread *td, /* Flags common to all filesystems. */ 658 const char *fstype, /* Filesystem type. */ 659 char *fspath, /* Mount path. */ 660 int fsflags, /* Flags common to all filesystems. */ 661 void *fsdata, /* Options local to the filesystem. */ 662 int compat /* Invocation from compat syscall. */ 663 ) 664 { 665 linker_file_t lf; 666 struct vnode *vp; 667 struct mount *mp; 668 struct vfsconf *vfsp; 669 int error, flag = 0, kern_flag = 0; 670 struct vattr va; 671 struct nameidata nd; 672 673 /* 674 * Be ultra-paranoid about making sure the type and fspath 675 * variables will fit in our mp buffers, including the 676 * terminating NUL. 677 */ 678 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 679 return (ENAMETOOLONG); 680 681 if (usermount == 0) { 682 error = suser(td); 683 if (error) 684 return (error); 685 } 686 /* 687 * Do not allow NFS export by non-root users. 688 */ 689 if (fsflags & MNT_EXPORTED) { 690 error = suser(td); 691 if (error) 692 return (error); 693 } 694 /* 695 * Silently enforce MNT_NOSUID and MNT_NODEV for non-root users. 696 */ 697 if (suser(td)) 698 fsflags |= MNT_NOSUID | MNT_NODEV; 699 /* 700 * Get vnode to be covered 701 */ 702 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, td); 703 if ((error = namei(&nd)) != 0) 704 return (error); 705 NDFREE(&nd, NDF_ONLY_PNBUF); 706 vp = nd.ni_vp; 707 if (fsflags & MNT_UPDATE) { 708 if ((vp->v_vflag & VV_ROOT) == 0) { 709 vput(vp); 710 return (EINVAL); 711 } 712 mp = vp->v_mount; 713 flag = mp->mnt_flag; 714 kern_flag = mp->mnt_kern_flag; 715 /* 716 * We only allow the filesystem to be reloaded if it 717 * is currently mounted read-only. 718 */ 719 if ((fsflags & MNT_RELOAD) && 720 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 721 vput(vp); 722 return (EOPNOTSUPP); /* Needs translation */ 723 } 724 /* 725 * Only root, or the user that did the original mount is 726 * permitted to update it. 727 */ 728 if (mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) { 729 error = suser(td); 730 if (error) { 731 vput(vp); 732 return (error); 733 } 734 } 735 if (vfs_busy(mp, LK_NOWAIT, 0, td)) { 736 vput(vp); 737 return (EBUSY); 738 } 739 VI_LOCK(vp); 740 if ((vp->v_iflag & VI_MOUNT) != 0 || 741 vp->v_mountedhere != NULL) { 742 VI_UNLOCK(vp); 743 vfs_unbusy(mp, td); 744 vput(vp); 745 return (EBUSY); 746 } 747 vp->v_iflag |= VI_MOUNT; 748 VI_UNLOCK(vp); 749 mp->mnt_flag |= fsflags & 750 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT); 751 VOP_UNLOCK(vp, 0, td); 752 if (compat == 0) { 753 mp->mnt_optnew = fsdata; 754 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 755 } 756 goto update; 757 } 758 /* 759 * If the user is not root, ensure that they own the directory 760 * onto which we are attempting to mount. 761 */ 762 error = VOP_GETATTR(vp, &va, td->td_ucred, td); 763 if (error) { 764 vput(vp); 765 return (error); 766 } 767 if (va.va_uid != td->td_ucred->cr_uid) { 768 error = suser(td); 769 if (error) { 770 vput(vp); 771 return (error); 772 } 773 } 774 if ((error = vinvalbuf(vp, V_SAVE, td->td_ucred, td, 0, 0)) != 0) { 775 vput(vp); 776 return (error); 777 } 778 if (vp->v_type != VDIR) { 779 vput(vp); 780 return (ENOTDIR); 781 } 782 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 783 if (!strcmp(vfsp->vfc_name, fstype)) 784 break; 785 if (vfsp == NULL) { 786 /* Only load modules for root (very important!). */ 787 error = suser(td); 788 if (error) { 789 vput(vp); 790 return (error); 791 } 792 error = securelevel_gt(td->td_ucred, 0); 793 if (error) { 794 vput(vp); 795 return (error); 796 } 797 error = linker_load_module(NULL, fstype, NULL, NULL, &lf); 798 if (error || lf == NULL) { 799 vput(vp); 800 if (lf == NULL) 801 error = ENODEV; 802 return (error); 803 } 804 lf->userrefs++; 805 /* Look up again to see if the VFS was loaded. */ 806 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 807 if (!strcmp(vfsp->vfc_name, fstype)) 808 break; 809 if (vfsp == NULL) { 810 lf->userrefs--; 811 linker_file_unload(lf); 812 vput(vp); 813 return (ENODEV); 814 } 815 } 816 VI_LOCK(vp); 817 if ((vp->v_iflag & VI_MOUNT) != 0 || 818 vp->v_mountedhere != NULL) { 819 VI_UNLOCK(vp); 820 vput(vp); 821 return (EBUSY); 822 } 823 vp->v_iflag |= VI_MOUNT; 824 VI_UNLOCK(vp); 825 826 /* 827 * Allocate and initialize the filesystem. 828 */ 829 error = vfs_mount_alloc(vp, vfsp, fspath, td, &mp); 830 if (error) { 831 vput(vp); 832 return (error); 833 } 834 VOP_UNLOCK(vp, 0, td); 835 836 /* XXXMAC: pass to vfs_mount_alloc? */ 837 if (compat == 0) 838 mp->mnt_optnew = fsdata; 839 update: 840 /* 841 * Check if the fs implements the type VFS_[N]MOUNT() 842 * function we are looking for. 843 */ 844 if ((compat == 0) == (mp->mnt_op->vfs_mount != NULL)) { 845 printf("%s doesn't support the %s mount syscall\n", 846 mp->mnt_vfc->vfc_name, compat? "old" : "new"); 847 VI_LOCK(vp); 848 vp->v_iflag &= ~VI_MOUNT; 849 VI_UNLOCK(vp); 850 if (mp->mnt_flag & MNT_UPDATE) 851 vfs_unbusy(mp, td); 852 else 853 vfs_mount_destroy(mp, td); 854 vrele(vp); 855 return (EOPNOTSUPP); 856 } 857 858 /* 859 * Set the mount level flags. 860 */ 861 if (fsflags & MNT_RDONLY) 862 mp->mnt_flag |= MNT_RDONLY; 863 else if (mp->mnt_flag & MNT_RDONLY) 864 mp->mnt_kern_flag |= MNTK_WANTRDWR; 865 mp->mnt_flag &=~ MNT_UPDATEMASK; 866 mp->mnt_flag |= fsflags & (MNT_UPDATEMASK | MNT_FORCE); 867 /* 868 * Mount the filesystem. 869 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 870 * get. No freeing of cn_pnbuf. 871 */ 872 error = compat? VFS_MOUNT(mp, fspath, fsdata, &nd, td) : 873 VFS_NMOUNT(mp, &nd, td); 874 if (!error) { 875 if (mp->mnt_opt != NULL) 876 vfs_freeopts(mp->mnt_opt); 877 mp->mnt_opt = mp->mnt_optnew; 878 } 879 /* 880 * Prevent external consumers of mount options from reading 881 * mnt_optnew. 882 */ 883 mp->mnt_optnew = NULL; 884 if (mp->mnt_flag & MNT_UPDATE) { 885 if (mp->mnt_kern_flag & MNTK_WANTRDWR) 886 mp->mnt_flag &= ~MNT_RDONLY; 887 mp->mnt_flag &=~ 888 (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_SNAPSHOT); 889 mp->mnt_kern_flag &=~ MNTK_WANTRDWR; 890 if (error) { 891 mp->mnt_flag = flag; 892 mp->mnt_kern_flag = kern_flag; 893 } 894 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 895 if (mp->mnt_syncer == NULL) 896 error = vfs_allocate_syncvnode(mp); 897 } else { 898 if (mp->mnt_syncer != NULL) 899 vrele(mp->mnt_syncer); 900 mp->mnt_syncer = NULL; 901 } 902 vfs_unbusy(mp, td); 903 VI_LOCK(vp); 904 vp->v_iflag &= ~VI_MOUNT; 905 VI_UNLOCK(vp); 906 vrele(vp); 907 return (error); 908 } 909 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 910 /* 911 * Put the new filesystem on the mount list after root. 912 */ 913 cache_purge(vp); 914 if (!error) { 915 struct vnode *newdp; 916 917 VI_LOCK(vp); 918 vp->v_iflag &= ~VI_MOUNT; 919 VI_UNLOCK(vp); 920 vp->v_mountedhere = mp; 921 mtx_lock(&mountlist_mtx); 922 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 923 mtx_unlock(&mountlist_mtx); 924 if (VFS_ROOT(mp, &newdp)) 925 panic("mount: lost mount"); 926 checkdirs(vp, newdp); 927 vput(newdp); 928 VOP_UNLOCK(vp, 0, td); 929 if ((mp->mnt_flag & MNT_RDONLY) == 0) 930 error = vfs_allocate_syncvnode(mp); 931 vfs_unbusy(mp, td); 932 if ((error = VFS_START(mp, 0, td)) != 0) 933 vrele(vp); 934 } else { 935 VI_LOCK(vp); 936 vp->v_iflag &= ~VI_MOUNT; 937 VI_UNLOCK(vp); 938 vfs_mount_destroy(mp, td); 939 vput(vp); 940 } 941 return (error); 942 } 943 944 /* 945 * Scan all active processes to see if any of them have a current 946 * or root directory of `olddp'. If so, replace them with the new 947 * mount point. 948 */ 949 static void 950 checkdirs(olddp, newdp) 951 struct vnode *olddp, *newdp; 952 { 953 struct filedesc *fdp; 954 struct proc *p; 955 int nrele; 956 957 if (vrefcnt(olddp) == 1) 958 return; 959 sx_slock(&allproc_lock); 960 LIST_FOREACH(p, &allproc, p_list) { 961 mtx_lock(&fdesc_mtx); 962 fdp = p->p_fd; 963 if (fdp == NULL) { 964 mtx_unlock(&fdesc_mtx); 965 continue; 966 } 967 nrele = 0; 968 FILEDESC_LOCK(fdp); 969 if (fdp->fd_cdir == olddp) { 970 VREF(newdp); 971 fdp->fd_cdir = newdp; 972 nrele++; 973 } 974 if (fdp->fd_rdir == olddp) { 975 VREF(newdp); 976 fdp->fd_rdir = newdp; 977 nrele++; 978 } 979 FILEDESC_UNLOCK(fdp); 980 mtx_unlock(&fdesc_mtx); 981 while (nrele--) 982 vrele(olddp); 983 } 984 sx_sunlock(&allproc_lock); 985 if (rootvnode == olddp) { 986 vrele(rootvnode); 987 VREF(newdp); 988 rootvnode = newdp; 989 } 990 } 991 992 /* 993 * Unmount a filesystem. 994 * 995 * Note: unmount takes a path to the vnode mounted on as argument, 996 * not special file (as before). 997 */ 998 #ifndef _SYS_SYSPROTO_H_ 999 struct unmount_args { 1000 char *path; 1001 int flags; 1002 }; 1003 #endif 1004 /* ARGSUSED */ 1005 int 1006 unmount(td, uap) 1007 struct thread *td; 1008 register struct unmount_args /* { 1009 char *path; 1010 int flags; 1011 } */ *uap; 1012 { 1013 struct mount *mp; 1014 char *pathbuf; 1015 int error, id0, id1; 1016 1017 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1018 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1019 if (error) { 1020 free(pathbuf, M_TEMP); 1021 return (error); 1022 } 1023 if (uap->flags & MNT_BYFSID) { 1024 /* Decode the filesystem ID. */ 1025 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1026 free(pathbuf, M_TEMP); 1027 return (EINVAL); 1028 } 1029 1030 mtx_lock(&mountlist_mtx); 1031 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) 1032 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1033 mp->mnt_stat.f_fsid.val[1] == id1) 1034 break; 1035 mtx_unlock(&mountlist_mtx); 1036 } else { 1037 mtx_lock(&mountlist_mtx); 1038 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) 1039 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1040 break; 1041 mtx_unlock(&mountlist_mtx); 1042 } 1043 free(pathbuf, M_TEMP); 1044 if (mp == NULL) { 1045 /* 1046 * Previously we returned ENOENT for a nonexistent path and 1047 * EINVAL for a non-mountpoint. We cannot tell these apart 1048 * now, so in the !MNT_BYFSID case return the more likely 1049 * EINVAL for compatibility. 1050 */ 1051 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1052 } 1053 1054 /* 1055 * Only root, or the user that did the original mount is 1056 * permitted to unmount this filesystem. 1057 */ 1058 if (mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) { 1059 error = suser(td); 1060 if (error) 1061 return (error); 1062 } 1063 1064 /* 1065 * Don't allow unmounting the root filesystem. 1066 */ 1067 if (mp->mnt_flag & MNT_ROOTFS) 1068 return (EINVAL); 1069 return (dounmount(mp, uap->flags, td)); 1070 } 1071 1072 /* 1073 * Do the actual filesystem unmount. 1074 */ 1075 int 1076 dounmount(mp, flags, td) 1077 struct mount *mp; 1078 int flags; 1079 struct thread *td; 1080 { 1081 struct vnode *coveredvp, *fsrootvp; 1082 int error; 1083 int async_flag; 1084 1085 mtx_lock(&mountlist_mtx); 1086 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1087 mtx_unlock(&mountlist_mtx); 1088 return (EBUSY); 1089 } 1090 mp->mnt_kern_flag |= MNTK_UNMOUNT; 1091 /* Allow filesystems to detect that a forced unmount is in progress. */ 1092 if (flags & MNT_FORCE) 1093 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1094 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | 1095 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), &mountlist_mtx, td); 1096 if (error) { 1097 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1098 if (mp->mnt_kern_flag & MNTK_MWAIT) 1099 wakeup(mp); 1100 return (error); 1101 } 1102 vn_start_write(NULL, &mp, V_WAIT); 1103 1104 if (mp->mnt_flag & MNT_EXPUBLIC) 1105 vfs_setpublicfs(NULL, NULL, NULL); 1106 1107 vfs_msync(mp, MNT_WAIT); 1108 async_flag = mp->mnt_flag & MNT_ASYNC; 1109 mp->mnt_flag &=~ MNT_ASYNC; 1110 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1111 if (mp->mnt_syncer != NULL) 1112 vrele(mp->mnt_syncer); 1113 /* 1114 * For forced unmounts, move process cdir/rdir refs on the fs root 1115 * vnode to the covered vnode. For non-forced unmounts we want 1116 * such references to cause an EBUSY error. 1117 */ 1118 if ((flags & MNT_FORCE) && VFS_ROOT(mp, &fsrootvp) == 0) { 1119 if (mp->mnt_vnodecovered != NULL) 1120 checkdirs(fsrootvp, mp->mnt_vnodecovered); 1121 if (fsrootvp == rootvnode) { 1122 vrele(rootvnode); 1123 rootvnode = NULL; 1124 } 1125 vput(fsrootvp); 1126 } 1127 if (((mp->mnt_flag & MNT_RDONLY) || 1128 (error = VFS_SYNC(mp, MNT_WAIT, td->td_ucred, td)) == 0) || 1129 (flags & MNT_FORCE)) { 1130 error = VFS_UNMOUNT(mp, flags, td); 1131 } 1132 vn_finished_write(mp); 1133 if (error) { 1134 /* Undo cdir/rdir and rootvnode changes made above. */ 1135 if ((flags & MNT_FORCE) && VFS_ROOT(mp, &fsrootvp) == 0) { 1136 if (mp->mnt_vnodecovered != NULL) 1137 checkdirs(mp->mnt_vnodecovered, fsrootvp); 1138 if (rootvnode == NULL) { 1139 rootvnode = fsrootvp; 1140 vref(rootvnode); 1141 } 1142 vput(fsrootvp); 1143 } 1144 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 1145 (void) vfs_allocate_syncvnode(mp); 1146 mtx_lock(&mountlist_mtx); 1147 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1148 mp->mnt_flag |= async_flag; 1149 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, 1150 &mountlist_mtx, td); 1151 if (mp->mnt_kern_flag & MNTK_MWAIT) 1152 wakeup(mp); 1153 return (error); 1154 } 1155 mtx_lock(&mountlist_mtx); 1156 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1157 if ((coveredvp = mp->mnt_vnodecovered) != NULL) 1158 coveredvp->v_mountedhere = NULL; 1159 mtx_unlock(&mountlist_mtx); 1160 vfs_mount_destroy(mp, td); 1161 if (coveredvp != NULL) 1162 vrele(coveredvp); 1163 return (0); 1164 } 1165 1166 /* 1167 * Lookup a filesystem type, and if found allocate and initialize 1168 * a mount structure for it. 1169 * 1170 * Devname is usually updated by mount(8) after booting. 1171 */ 1172 int 1173 vfs_rootmountalloc(fstypename, devname, mpp) 1174 char *fstypename; 1175 char *devname; 1176 struct mount **mpp; 1177 { 1178 struct thread *td = curthread; /* XXX */ 1179 struct vfsconf *vfsp; 1180 struct mount *mp; 1181 int error; 1182 1183 if (fstypename == NULL) 1184 return (ENODEV); 1185 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1186 if (!strcmp(vfsp->vfc_name, fstypename)) 1187 break; 1188 if (vfsp == NULL) 1189 return (ENODEV); 1190 error = vfs_mount_alloc(NULLVP, vfsp, "/", td, &mp); 1191 if (error) 1192 return (error); 1193 mp->mnt_flag |= MNT_RDONLY | MNT_ROOTFS; 1194 strlcpy(mp->mnt_stat.f_mntfromname, devname, MNAMELEN); 1195 *mpp = mp; 1196 return (0); 1197 } 1198 1199 /* 1200 * Find and mount the root filesystem 1201 */ 1202 void 1203 vfs_mountroot(void) 1204 { 1205 char *cp; 1206 int error, i; 1207 1208 g_waitidle(); 1209 1210 /* 1211 * The root filesystem information is compiled in, and we are 1212 * booted with instructions to use it. 1213 */ 1214 #ifdef ROOTDEVNAME 1215 if ((boothowto & RB_DFLTROOT) && !vfs_mountroot_try(ROOTDEVNAME)) 1216 return; 1217 #endif 1218 /* 1219 * We are booted with instructions to prompt for the root filesystem, 1220 * or to use the compiled-in default when it doesn't exist. 1221 */ 1222 if (boothowto & (RB_DFLTROOT | RB_ASKNAME)) { 1223 if (!vfs_mountroot_ask()) 1224 return; 1225 } 1226 1227 /* 1228 * We've been given the generic "use CDROM as root" flag. This is 1229 * necessary because one media may be used in many different 1230 * devices, so we need to search for them. 1231 */ 1232 if (boothowto & RB_CDROM) { 1233 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 1234 if (!vfs_mountroot_try(cdrom_rootdevnames[i])) 1235 return; 1236 } 1237 } 1238 1239 /* 1240 * Try to use the value read by the loader from /etc/fstab, or 1241 * supplied via some other means. This is the preferred 1242 * mechanism. 1243 */ 1244 if ((cp = getenv("vfs.root.mountfrom")) != NULL) { 1245 error = vfs_mountroot_try(cp); 1246 freeenv(cp); 1247 if (!error) 1248 return; 1249 } 1250 1251 /* 1252 * Try values that may have been computed by the machine-dependant 1253 * legacy code. 1254 */ 1255 if (!vfs_mountroot_try(rootdevnames[0])) 1256 return; 1257 if (!vfs_mountroot_try(rootdevnames[1])) 1258 return; 1259 1260 /* 1261 * If we have a compiled-in default, and haven't already tried it, try 1262 * it now. 1263 */ 1264 #ifdef ROOTDEVNAME 1265 if (!(boothowto & RB_DFLTROOT)) 1266 if (!vfs_mountroot_try(ROOTDEVNAME)) 1267 return; 1268 #endif 1269 1270 /* 1271 * Everything so far has failed, prompt on the console if we haven't 1272 * already tried that. 1273 */ 1274 if (!(boothowto & (RB_DFLTROOT | RB_ASKNAME)) && !vfs_mountroot_ask()) 1275 return; 1276 panic("Root mount failed, startup aborted."); 1277 } 1278 1279 /* 1280 * Mount (mountfrom) as the root filesystem. 1281 */ 1282 static int 1283 vfs_mountroot_try(char *mountfrom) 1284 { 1285 struct mount *mp; 1286 char *vfsname, *path; 1287 const char *devname; 1288 int error; 1289 char patt[32]; 1290 int s; 1291 1292 vfsname = NULL; 1293 path = NULL; 1294 mp = NULL; 1295 error = EINVAL; 1296 1297 if (mountfrom == NULL) 1298 return(error); /* don't complain */ 1299 1300 s = splcam(); /* Overkill, but annoying without it */ 1301 printf("Mounting root from %s\n", mountfrom); 1302 splx(s); 1303 1304 /* parse vfs name and path */ 1305 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1306 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 1307 vfsname[0] = path[0] = 0; 1308 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 1309 if (sscanf(mountfrom, patt, vfsname, path) < 1) 1310 goto done; 1311 1312 /* allocate a root mount */ 1313 error = vfs_rootmountalloc(vfsname, path[0] != 0 ? path : ROOTNAME, 1314 &mp); 1315 if (error != 0) { 1316 printf("Can't allocate root mount for filesystem '%s': %d\n", 1317 vfsname, error); 1318 goto done; 1319 } 1320 1321 /* do our best to set rootdev */ 1322 if ((path[0] != 0) && setrootbyname(path)) 1323 printf("setrootbyname failed\n"); 1324 1325 /* If the root device is a type "memory disk", mount RW */ 1326 if (rootdev != NODEV && devsw(rootdev) != NULL) { 1327 devname = devtoname(rootdev); 1328 if (devname[0] == 'm' && devname[1] == 'd') 1329 mp->mnt_flag &= ~MNT_RDONLY; 1330 } 1331 1332 error = VFS_MOUNT(mp, NULL, NULL, NULL, curthread); 1333 1334 done: 1335 if (vfsname != NULL) 1336 free(vfsname, M_MOUNT); 1337 if (path != NULL) 1338 free(path, M_MOUNT); 1339 if (error != 0) { 1340 if (mp != NULL) 1341 vfs_mount_destroy(mp, curthread); 1342 printf("Root mount failed: %d\n", error); 1343 } else { 1344 1345 /* register with list of mounted filesystems */ 1346 mtx_lock(&mountlist_mtx); 1347 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 1348 mtx_unlock(&mountlist_mtx); 1349 1350 /* sanity check system clock against root fs timestamp */ 1351 inittodr(mp->mnt_time); 1352 vfs_unbusy(mp, curthread); 1353 error = VFS_START(mp, 0, curthread); 1354 } 1355 return(error); 1356 } 1357 1358 /* 1359 * Spin prompting on the console for a suitable root filesystem 1360 */ 1361 static int 1362 vfs_mountroot_ask(void) 1363 { 1364 char name[128]; 1365 1366 for(;;) { 1367 printf("\nManual root filesystem specification:\n"); 1368 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 1369 #if defined(__i386__) || defined(__ia64__) 1370 printf(" eg. ufs:da0s1a\n"); 1371 #else 1372 printf(" eg. ufs:/dev/da0a\n"); 1373 #endif 1374 printf(" ? List valid disk boot devices\n"); 1375 printf(" <empty line> Abort manual input\n"); 1376 printf("\nmountroot> "); 1377 gets(name); 1378 if (name[0] == 0) 1379 return(1); 1380 if (name[0] == '?') { 1381 printf("\nList of GEOM managed disk devices:\n "); 1382 g_dev_print(); 1383 continue; 1384 } 1385 if (!vfs_mountroot_try(name)) 1386 return(0); 1387 } 1388 } 1389 1390 /* 1391 * Local helper function for vfs_mountroot_ask. 1392 */ 1393 static void 1394 gets(char *cp) 1395 { 1396 char *lp; 1397 int c; 1398 1399 lp = cp; 1400 for (;;) { 1401 printf("%c", c = cngetc() & 0177); 1402 switch (c) { 1403 case -1: 1404 case '\n': 1405 case '\r': 1406 *lp++ = '\0'; 1407 return; 1408 case '\b': 1409 case '\177': 1410 if (lp > cp) { 1411 printf(" \b"); 1412 lp--; 1413 } 1414 continue; 1415 case '#': 1416 lp--; 1417 if (lp < cp) 1418 lp = cp; 1419 continue; 1420 case '@': 1421 case 'u' & 037: 1422 lp = cp; 1423 printf("%c", '\n'); 1424 continue; 1425 default: 1426 *lp++ = c; 1427 } 1428 } 1429 } 1430 1431 /* 1432 * Convert a given name to the dev_t of the disk-like device 1433 * it refers to. 1434 */ 1435 dev_t 1436 getdiskbyname(char *name) { 1437 char *cp; 1438 dev_t dev; 1439 1440 cp = name; 1441 if (!bcmp(cp, "/dev/", 5)) 1442 cp += 5; 1443 1444 dev = NODEV; 1445 EVENTHANDLER_INVOKE(dev_clone, cp, strlen(cp), &dev); 1446 return (dev); 1447 } 1448 1449 /* 1450 * Set rootdev to match (name), given that we expect it to 1451 * refer to a disk-like device. 1452 */ 1453 static int 1454 setrootbyname(char *name) 1455 { 1456 dev_t diskdev; 1457 1458 diskdev = getdiskbyname(name); 1459 if (diskdev != NODEV) { 1460 rootdev = diskdev; 1461 return (0); 1462 } 1463 1464 return (1); 1465 } 1466 1467 /* Show the dev_t for a disk specified by name */ 1468 #ifdef DDB 1469 DB_SHOW_COMMAND(disk, db_getdiskbyname) 1470 { 1471 dev_t dev; 1472 1473 if (modif[0] == '\0') { 1474 db_error("usage: show disk/devicename"); 1475 return; 1476 } 1477 dev = getdiskbyname(modif); 1478 if (dev != NODEV) 1479 db_printf("dev_t = %p\n", dev); 1480 else 1481 db_printf("No disk device matched.\n"); 1482 } 1483 #endif 1484 1485 /* 1486 * Get a mount option by its name. 1487 * 1488 * Return 0 if the option was found, ENOENT otherwise. 1489 * If len is non-NULL it will be filled with the length 1490 * of the option. If buf is non-NULL, it will be filled 1491 * with the address of the option. 1492 */ 1493 int 1494 vfs_getopt(opts, name, buf, len) 1495 struct vfsoptlist *opts; 1496 const char *name; 1497 void **buf; 1498 int *len; 1499 { 1500 struct vfsopt *opt; 1501 1502 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1503 1504 TAILQ_FOREACH(opt, opts, link) { 1505 if (strcmp(name, opt->name) == 0) { 1506 if (len != NULL) 1507 *len = opt->len; 1508 if (buf != NULL) 1509 *buf = opt->value; 1510 return (0); 1511 } 1512 } 1513 return (ENOENT); 1514 } 1515 1516 /* 1517 * Find and copy a mount option. 1518 * 1519 * The size of the buffer has to be specified 1520 * in len, if it is not the same length as the 1521 * mount option, EINVAL is returned. 1522 * Returns ENOENT if the option is not found. 1523 */ 1524 int 1525 vfs_copyopt(opts, name, dest, len) 1526 struct vfsoptlist *opts; 1527 const char *name; 1528 void *dest; 1529 int len; 1530 { 1531 struct vfsopt *opt; 1532 1533 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1534 1535 TAILQ_FOREACH(opt, opts, link) { 1536 if (strcmp(name, opt->name) == 0) { 1537 if (len != opt->len) 1538 return (EINVAL); 1539 bcopy(opt->value, dest, opt->len); 1540 return (0); 1541 } 1542 } 1543 return (ENOENT); 1544 } 1545