1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/libkern.h> 45 #include <sys/mac.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/proc.h> 51 #include <sys/filedesc.h> 52 #include <sys/reboot.h> 53 #include <sys/syscallsubr.h> 54 #include <sys/sysproto.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/sysent.h> 58 #include <sys/systm.h> 59 #include <sys/vnode.h> 60 #include <vm/uma.h> 61 62 #include <geom/geom.h> 63 64 #include <machine/stdarg.h> 65 66 #include <security/audit/audit.h> 67 68 #include "opt_rootdevname.h" 69 #include "opt_ddb.h" 70 #include "opt_mac.h" 71 72 #ifdef DDB 73 #include <ddb/ddb.h> 74 #endif 75 76 #define ROOTNAME "root_device" 77 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 78 79 static int vfs_domount(struct thread *td, const char *fstype, 80 char *fspath, int fsflags, void *fsdata); 81 static struct mount *vfs_mount_alloc(struct vnode *dvp, struct vfsconf *vfsp, 82 const char *fspath, struct thread *td); 83 static int vfs_mountroot_ask(void); 84 static int vfs_mountroot_try(const char *mountfrom); 85 static int vfs_donmount(struct thread *td, int fsflags, 86 struct uio *fsoptions); 87 static void free_mntarg(struct mntarg *ma); 88 static void vfs_mount_destroy(struct mount *); 89 static int vfs_getopt_pos(struct vfsoptlist *opts, const char *name); 90 91 static int usermount = 0; 92 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 93 "Unprivileged users may mount and unmount file systems"); 94 95 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 96 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 97 static uma_zone_t mount_zone; 98 99 /* List of mounted filesystems. */ 100 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 101 102 /* For any iteration/modification of mountlist */ 103 struct mtx mountlist_mtx; 104 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 105 106 TAILQ_HEAD(vfsoptlist, vfsopt); 107 struct vfsopt { 108 TAILQ_ENTRY(vfsopt) link; 109 char *name; 110 void *value; 111 int len; 112 }; 113 114 /* 115 * The vnode of the system's root (/ in the filesystem, without chroot 116 * active.) 117 */ 118 struct vnode *rootvnode; 119 120 /* 121 * The root filesystem is detailed in the kernel environment variable 122 * vfs.root.mountfrom, which is expected to be in the general format 123 * 124 * <vfsname>:[<path>] 125 * vfsname := the name of a VFS known to the kernel and capable 126 * of being mounted as root 127 * path := disk device name or other data used by the filesystem 128 * to locate its physical store 129 */ 130 131 /* 132 * Global opts, taken by all filesystems 133 */ 134 static const char *global_opts[] = { 135 "errmsg", 136 "fstype", 137 "fspath", 138 "rdonly", 139 "ro", 140 "rw", 141 "suid", 142 "exec", 143 "update", 144 NULL 145 }; 146 147 /* 148 * The root specifiers we will try if RB_CDROM is specified. 149 */ 150 static char *cdrom_rootdevnames[] = { 151 "cd9660:cd0", 152 "cd9660:acd0", 153 NULL 154 }; 155 156 /* legacy find-root code */ 157 char *rootdevnames[2] = {NULL, NULL}; 158 #ifndef ROOTDEVNAME 159 # define ROOTDEVNAME NULL 160 #endif 161 static const char *ctrootdevname = ROOTDEVNAME; 162 163 /* 164 * --------------------------------------------------------------------- 165 * Functions for building and sanitizing the mount options 166 */ 167 168 /* Remove one mount option. */ 169 static void 170 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 171 { 172 173 TAILQ_REMOVE(opts, opt, link); 174 free(opt->name, M_MOUNT); 175 if (opt->value != NULL) 176 free(opt->value, M_MOUNT); 177 #ifdef INVARIANTS 178 else if (opt->len != 0) 179 panic("%s: mount option with NULL value but length != 0", 180 __func__); 181 #endif 182 free(opt, M_MOUNT); 183 } 184 185 /* Release all resources related to the mount options. */ 186 static void 187 vfs_freeopts(struct vfsoptlist *opts) 188 { 189 struct vfsopt *opt; 190 191 while (!TAILQ_EMPTY(opts)) { 192 opt = TAILQ_FIRST(opts); 193 vfs_freeopt(opts, opt); 194 } 195 free(opts, M_MOUNT); 196 } 197 198 /* 199 * Check if options are equal (with or without the "no" prefix). 200 */ 201 static int 202 vfs_equalopts(const char *opt1, const char *opt2) 203 { 204 205 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 206 if (strcmp(opt1, opt2) == 0) 207 return (1); 208 /* "noopt" vs. "opt" */ 209 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 210 return (1); 211 /* "opt" vs. "noopt" */ 212 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 213 return (1); 214 return (0); 215 } 216 217 /* 218 * If a mount option is specified several times, 219 * (with or without the "no" prefix) only keep 220 * the last occurence of it. 221 */ 222 static void 223 vfs_sanitizeopts(struct vfsoptlist *opts) 224 { 225 struct vfsopt *opt, *opt2, *tmp; 226 227 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 228 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 229 while (opt2 != NULL) { 230 if (vfs_equalopts(opt->name, opt2->name)) { 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 = 0; 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->len = optlen; 298 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 299 if (auio->uio_segflg == UIO_SYSSPACE) { 300 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 301 optlen); 302 } else { 303 error = copyin(auio->uio_iov[i + 1].iov_base, 304 opt->value, optlen); 305 if (error) 306 goto bad; 307 } 308 } 309 } 310 vfs_sanitizeopts(opts); 311 *options = opts; 312 return (0); 313 bad: 314 vfs_freeopts(opts); 315 return (error); 316 } 317 318 /* 319 * Merge the old mount options with the new ones passed 320 * in the MNT_UPDATE case. 321 */ 322 static void 323 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 324 { 325 struct vfsopt *opt, *opt2, *new; 326 327 TAILQ_FOREACH(opt, opts, link) { 328 /* 329 * Check that this option hasn't been redefined 330 * nor cancelled with a "no" mount option. 331 */ 332 opt2 = TAILQ_FIRST(toopts); 333 while (opt2 != NULL) { 334 if (strcmp(opt2->name, opt->name) == 0) 335 goto next; 336 if (strncmp(opt2->name, "no", 2) == 0 && 337 strcmp(opt2->name + 2, opt->name) == 0) { 338 vfs_freeopt(toopts, opt2); 339 goto next; 340 } 341 opt2 = TAILQ_NEXT(opt2, link); 342 } 343 /* We want this option, duplicate it. */ 344 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 345 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 346 strcpy(new->name, opt->name); 347 if (opt->len != 0) { 348 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 349 bcopy(opt->value, new->value, opt->len); 350 } else { 351 new->value = NULL; 352 } 353 new->len = opt->len; 354 TAILQ_INSERT_TAIL(toopts, new, link); 355 next: 356 continue; 357 } 358 } 359 360 /* 361 * --------------------------------------------------------------------- 362 * Mount a filesystem 363 */ 364 int 365 nmount(td, uap) 366 struct thread *td; 367 struct nmount_args /* { 368 struct iovec *iovp; 369 unsigned int iovcnt; 370 int flags; 371 } */ *uap; 372 { 373 struct uio *auio; 374 struct iovec *iov; 375 unsigned int i; 376 int error; 377 u_int iovcnt; 378 379 AUDIT_ARG(fflags, uap->flags); 380 381 /* Kick out MNT_ROOTFS early as it is legal internally */ 382 if (uap->flags & MNT_ROOTFS) 383 return (EINVAL); 384 385 iovcnt = uap->iovcnt; 386 /* 387 * Check that we have an even number of iovec's 388 * and that we have at least two options. 389 */ 390 if ((iovcnt & 1) || (iovcnt < 4)) 391 return (EINVAL); 392 393 error = copyinuio(uap->iovp, iovcnt, &auio); 394 if (error) 395 return (error); 396 iov = auio->uio_iov; 397 for (i = 0; i < iovcnt; i++) { 398 if (iov->iov_len > MMAXOPTIONLEN) { 399 free(auio, M_IOV); 400 return (EINVAL); 401 } 402 iov++; 403 } 404 error = vfs_donmount(td, uap->flags, auio); 405 406 free(auio, M_IOV); 407 return (error); 408 } 409 410 /* 411 * --------------------------------------------------------------------- 412 * Various utility functions 413 */ 414 415 void 416 vfs_ref(struct mount *mp) 417 { 418 419 MNT_ILOCK(mp); 420 MNT_REF(mp); 421 MNT_IUNLOCK(mp); 422 } 423 424 void 425 vfs_rel(struct mount *mp) 426 { 427 428 MNT_ILOCK(mp); 429 MNT_REL(mp); 430 MNT_IUNLOCK(mp); 431 } 432 433 static int 434 mount_init(void *mem, int size, int flags) 435 { 436 struct mount *mp; 437 438 mp = (struct mount *)mem; 439 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 440 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 441 return (0); 442 } 443 444 static void 445 mount_fini(void *mem, int size) 446 { 447 struct mount *mp; 448 449 mp = (struct mount *)mem; 450 lockdestroy(&mp->mnt_lock); 451 mtx_destroy(&mp->mnt_mtx); 452 } 453 454 /* 455 * Allocate and initialize the mount point struct. 456 */ 457 static struct mount * 458 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, 459 const char *fspath, struct thread *td) 460 { 461 struct mount *mp; 462 463 mp = uma_zalloc(mount_zone, M_WAITOK); 464 bzero(&mp->mnt_startzero, 465 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 466 TAILQ_INIT(&mp->mnt_nvnodelist); 467 mp->mnt_nvnodelistsize = 0; 468 mp->mnt_ref = 0; 469 (void) vfs_busy(mp, LK_NOWAIT, 0, td); 470 mp->mnt_op = vfsp->vfc_vfsops; 471 mp->mnt_vfc = vfsp; 472 vfsp->vfc_refcount++; /* XXX Unlocked */ 473 mp->mnt_stat.f_type = vfsp->vfc_typenum; 474 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 475 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 476 mp->mnt_vnodecovered = vp; 477 mp->mnt_cred = crdup(td->td_ucred); 478 mp->mnt_stat.f_owner = td->td_ucred->cr_uid; 479 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 480 mp->mnt_iosize_max = DFLTPHYS; 481 #ifdef MAC 482 mac_init_mount(mp); 483 mac_create_mount(td->td_ucred, mp); 484 #endif 485 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 486 return (mp); 487 } 488 489 /* 490 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 491 */ 492 static void 493 vfs_mount_destroy(struct mount *mp) 494 { 495 int i; 496 497 MNT_ILOCK(mp); 498 for (i = 0; mp->mnt_ref && i < 3; i++) 499 msleep(mp, MNT_MTX(mp), PVFS, "mntref", hz); 500 /* 501 * This will always cause a 3 second delay in rebooting due to 502 * refs on the root mountpoint that never go away. Most of these 503 * are held by init which never exits. 504 */ 505 if (i == 3 && (!rebooting || bootverbose)) 506 printf("Mount point %s had %d dangling refs\n", 507 mp->mnt_stat.f_mntonname, mp->mnt_ref); 508 if (mp->mnt_holdcnt != 0) { 509 printf("Waiting for mount point to be unheld\n"); 510 while (mp->mnt_holdcnt != 0) { 511 mp->mnt_holdcntwaiters++; 512 msleep(&mp->mnt_holdcnt, MNT_MTX(mp), 513 PZERO, "mntdestroy", 0); 514 mp->mnt_holdcntwaiters--; 515 } 516 printf("mount point unheld\n"); 517 } 518 if (mp->mnt_writeopcount > 0) { 519 printf("Waiting for mount point write ops\n"); 520 while (mp->mnt_writeopcount > 0) { 521 mp->mnt_kern_flag |= MNTK_SUSPEND; 522 msleep(&mp->mnt_writeopcount, 523 MNT_MTX(mp), 524 PZERO, "mntdestroy2", 0); 525 } 526 printf("mount point write ops completed\n"); 527 } 528 if (mp->mnt_secondary_writes > 0) { 529 printf("Waiting for mount point secondary write ops\n"); 530 while (mp->mnt_secondary_writes > 0) { 531 mp->mnt_kern_flag |= MNTK_SUSPEND; 532 msleep(&mp->mnt_secondary_writes, 533 MNT_MTX(mp), 534 PZERO, "mntdestroy3", 0); 535 } 536 printf("mount point secondary write ops completed\n"); 537 } 538 MNT_IUNLOCK(mp); 539 mp->mnt_vfc->vfc_refcount--; 540 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 541 struct vnode *vp; 542 543 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 544 vprint("", vp); 545 panic("unmount: dangling vnode"); 546 } 547 MNT_ILOCK(mp); 548 if (mp->mnt_kern_flag & MNTK_MWAIT) 549 wakeup(mp); 550 if (mp->mnt_writeopcount != 0) 551 panic("vfs_mount_destroy: nonzero writeopcount"); 552 if (mp->mnt_secondary_writes != 0) 553 panic("vfs_mount_destroy: nonzero secondary_writes"); 554 if (mp->mnt_nvnodelistsize != 0) 555 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 556 mp->mnt_writeopcount = -1000; 557 mp->mnt_nvnodelistsize = -1000; 558 mp->mnt_secondary_writes = -1000; 559 MNT_IUNLOCK(mp); 560 #ifdef MAC 561 mac_destroy_mount(mp); 562 #endif 563 if (mp->mnt_opt != NULL) 564 vfs_freeopts(mp->mnt_opt); 565 crfree(mp->mnt_cred); 566 uma_zfree(mount_zone, mp); 567 } 568 569 static int 570 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 571 { 572 struct vfsoptlist *optlist; 573 struct vfsopt *opt, *noro_opt; 574 char *fstype, *fspath, *errmsg; 575 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 576 int has_rw, has_noro; 577 578 errmsg_len = 0; 579 errmsg_pos = -1; 580 has_rw = 0; 581 has_noro = 0; 582 583 error = vfs_buildopts(fsoptions, &optlist); 584 if (error) 585 return (error); 586 587 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 588 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 589 else 590 errmsg_len = 0; 591 592 /* 593 * We need these two options before the others, 594 * and they are mandatory for any filesystem. 595 * Ensure they are NUL terminated as well. 596 */ 597 fstypelen = 0; 598 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 599 if (error || fstype[fstypelen - 1] != '\0') { 600 error = EINVAL; 601 if (errmsg != NULL) 602 strncpy(errmsg, "Invalid fstype", errmsg_len); 603 goto bail; 604 } 605 fspathlen = 0; 606 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 607 if (error || fspath[fspathlen - 1] != '\0') { 608 error = EINVAL; 609 if (errmsg != NULL) 610 strncpy(errmsg, "Invalid fspath", errmsg_len); 611 goto bail; 612 } 613 614 /* 615 * We need to see if we have the "update" option 616 * before we call vfs_domount(), since vfs_domount() has special 617 * logic based on MNT_UPDATE. This is very important 618 * when we want to update the root filesystem. 619 */ 620 TAILQ_FOREACH(opt, optlist, link) { 621 if (strcmp(opt->name, "update") == 0) 622 fsflags |= MNT_UPDATE; 623 else if (strcmp(opt->name, "async") == 0) 624 fsflags |= MNT_ASYNC; 625 else if (strcmp(opt->name, "force") == 0) 626 fsflags |= MNT_FORCE; 627 else if (strcmp(opt->name, "multilabel") == 0) 628 fsflags |= MNT_MULTILABEL; 629 else if (strcmp(opt->name, "noasync") == 0) 630 fsflags &= ~MNT_ASYNC; 631 else if (strcmp(opt->name, "noatime") == 0) 632 fsflags |= MNT_NOATIME; 633 else if (strcmp(opt->name, "noclusterr") == 0) 634 fsflags |= MNT_NOCLUSTERR; 635 else if (strcmp(opt->name, "noclusterw") == 0) 636 fsflags |= MNT_NOCLUSTERW; 637 else if (strcmp(opt->name, "noexec") == 0) 638 fsflags |= MNT_NOEXEC; 639 else if (strcmp(opt->name, "nosuid") == 0) 640 fsflags |= MNT_NOSUID; 641 else if (strcmp(opt->name, "nosymfollow") == 0) 642 fsflags |= MNT_NOSYMFOLLOW; 643 else if (strcmp(opt->name, "noro") == 0) { 644 fsflags &= ~MNT_RDONLY; 645 has_noro = 1; 646 } 647 else if (strcmp(opt->name, "rw") == 0) { 648 fsflags &= ~MNT_RDONLY; 649 has_rw = 1; 650 } 651 else if (strcmp(opt->name, "ro") == 0 || 652 strcmp(opt->name, "rdonly") == 0) 653 fsflags |= MNT_RDONLY; 654 else if (strcmp(opt->name, "snapshot") == 0) 655 fsflags |= MNT_SNAPSHOT; 656 else if (strcmp(opt->name, "suiddir") == 0) 657 fsflags |= MNT_SUIDDIR; 658 else if (strcmp(opt->name, "sync") == 0) 659 fsflags |= MNT_SYNCHRONOUS; 660 else if (strcmp(opt->name, "union") == 0) 661 fsflags |= MNT_UNION; 662 } 663 664 /* 665 * If "rw" was specified as a mount option, and we 666 * are trying to update a mount-point from "ro" to "rw", 667 * we need a mount option "noro", since in vfs_mergeopts(), 668 * "noro" will cancel "ro", but "rw" will not do anything. 669 */ 670 if (has_rw && !has_noro) { 671 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 672 noro_opt->name = strdup("noro", M_MOUNT); 673 noro_opt->value = NULL; 674 noro_opt->len = 0; 675 TAILQ_INSERT_TAIL(optlist, noro_opt, link); 676 } 677 678 /* 679 * Be ultra-paranoid about making sure the type and fspath 680 * variables will fit in our mp buffers, including the 681 * terminating NUL. 682 */ 683 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 684 error = ENAMETOOLONG; 685 goto bail; 686 } 687 688 mtx_lock(&Giant); 689 error = vfs_domount(td, fstype, fspath, fsflags, optlist); 690 mtx_unlock(&Giant); 691 bail: 692 /* copyout the errmsg */ 693 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 694 && errmsg_len > 0 && errmsg != NULL) { 695 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 696 strncpy(fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 697 errmsg, 698 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 699 } else { 700 copystr(errmsg, 701 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 702 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len, 703 NULL); 704 } 705 } 706 707 if (error != 0) 708 vfs_freeopts(optlist); 709 return (error); 710 } 711 712 /* 713 * --------------------------------------------------------------------- 714 * Old mount API. 715 */ 716 #ifndef _SYS_SYSPROTO_H_ 717 struct mount_args { 718 char *type; 719 char *path; 720 int flags; 721 caddr_t data; 722 }; 723 #endif 724 /* ARGSUSED */ 725 int 726 mount(td, uap) 727 struct thread *td; 728 struct mount_args /* { 729 char *type; 730 char *path; 731 int flags; 732 caddr_t data; 733 } */ *uap; 734 { 735 char *fstype; 736 struct vfsconf *vfsp = NULL; 737 struct mntarg *ma = NULL; 738 int error; 739 740 AUDIT_ARG(fflags, uap->flags); 741 742 /* Kick out MNT_ROOTFS early as it is legal internally */ 743 uap->flags &= ~MNT_ROOTFS; 744 745 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 746 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 747 if (error) { 748 free(fstype, M_TEMP); 749 return (error); 750 } 751 752 AUDIT_ARG(text, fstype); 753 mtx_lock(&Giant); 754 vfsp = vfs_byname_kld(fstype, td, &error); 755 free(fstype, M_TEMP); 756 if (vfsp == NULL) { 757 mtx_unlock(&Giant); 758 return (ENOENT); 759 } 760 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 761 mtx_unlock(&Giant); 762 return (EOPNOTSUPP); 763 } 764 765 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 766 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 767 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 768 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 769 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 770 771 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td); 772 mtx_unlock(&Giant); 773 return (error); 774 } 775 776 777 /* 778 * vfs_domount(): actually attempt a filesystem mount. 779 */ 780 static int 781 vfs_domount( 782 struct thread *td, /* Flags common to all filesystems. */ 783 const char *fstype, /* Filesystem type. */ 784 char *fspath, /* Mount path. */ 785 int fsflags, /* Flags common to all filesystems. */ 786 void *fsdata /* Options local to the filesystem. */ 787 ) 788 { 789 struct vnode *vp; 790 struct mount *mp; 791 struct vfsconf *vfsp; 792 struct export_args export; 793 int error, flag = 0, kern_flag = 0; 794 struct vattr va; 795 struct nameidata nd; 796 797 mtx_assert(&Giant, MA_OWNED); 798 /* 799 * Be ultra-paranoid about making sure the type and fspath 800 * variables will fit in our mp buffers, including the 801 * terminating NUL. 802 */ 803 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 804 return (ENAMETOOLONG); 805 806 if (jailed(td->td_ucred)) 807 return (EPERM); 808 if (usermount == 0) { 809 if ((error = suser(td)) != 0) 810 return (error); 811 } 812 813 /* 814 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 815 */ 816 if (fsflags & (MNT_EXPORTED | MNT_SUIDDIR)) { 817 if ((error = suser(td)) != 0) 818 return (error); 819 } 820 /* 821 * Silently enforce MNT_NOSUID and MNT_USER for 822 * unprivileged users. 823 */ 824 if (suser(td) != 0) 825 fsflags |= MNT_NOSUID | MNT_USER; 826 827 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 828 vfsp = NULL; 829 if ((fsflags & MNT_UPDATE) == 0) { 830 /* Don't try to load KLDs if we're mounting the root. */ 831 if (fsflags & MNT_ROOTFS) 832 vfsp = vfs_byname(fstype); 833 else 834 vfsp = vfs_byname_kld(fstype, td, &error); 835 if (vfsp == NULL) 836 return (ENODEV); 837 } 838 /* 839 * Get vnode to be covered 840 */ 841 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, 842 fspath, td); 843 if ((error = namei(&nd)) != 0) 844 return (error); 845 NDFREE(&nd, NDF_ONLY_PNBUF); 846 vp = nd.ni_vp; 847 if (fsflags & MNT_UPDATE) { 848 if ((vp->v_vflag & VV_ROOT) == 0) { 849 vput(vp); 850 return (EINVAL); 851 } 852 mp = vp->v_mount; 853 flag = mp->mnt_flag; 854 kern_flag = mp->mnt_kern_flag; 855 /* 856 * We only allow the filesystem to be reloaded if it 857 * is currently mounted read-only. 858 */ 859 if ((fsflags & MNT_RELOAD) && 860 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 861 vput(vp); 862 return (EOPNOTSUPP); /* Needs translation */ 863 } 864 /* 865 * Only privileged root, or (if MNT_USER is set) the user that 866 * did the original mount is permitted to update it. 867 */ 868 error = vfs_suser(mp, td); 869 if (error) { 870 vput(vp); 871 return (error); 872 } 873 if (vfs_busy(mp, LK_NOWAIT, 0, td)) { 874 vput(vp); 875 return (EBUSY); 876 } 877 VI_LOCK(vp); 878 if ((vp->v_iflag & VI_MOUNT) != 0 || 879 vp->v_mountedhere != NULL) { 880 VI_UNLOCK(vp); 881 vfs_unbusy(mp, td); 882 vput(vp); 883 return (EBUSY); 884 } 885 vp->v_iflag |= VI_MOUNT; 886 VI_UNLOCK(vp); 887 mp->mnt_flag |= fsflags & 888 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS); 889 VOP_UNLOCK(vp, 0, td); 890 mp->mnt_optnew = fsdata; 891 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 892 } else { 893 /* 894 * If the user is not root, ensure that they own the directory 895 * onto which we are attempting to mount. 896 */ 897 error = VOP_GETATTR(vp, &va, td->td_ucred, td); 898 if (error) { 899 vput(vp); 900 return (error); 901 } 902 if (va.va_uid != td->td_ucred->cr_uid) { 903 if ((error = suser(td)) != 0) { 904 vput(vp); 905 return (error); 906 } 907 } 908 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 909 if (error != 0) { 910 vput(vp); 911 return (error); 912 } 913 if (vp->v_type != VDIR) { 914 vput(vp); 915 return (ENOTDIR); 916 } 917 VI_LOCK(vp); 918 if ((vp->v_iflag & VI_MOUNT) != 0 || 919 vp->v_mountedhere != NULL) { 920 VI_UNLOCK(vp); 921 vput(vp); 922 return (EBUSY); 923 } 924 vp->v_iflag |= VI_MOUNT; 925 VI_UNLOCK(vp); 926 927 /* 928 * Allocate and initialize the filesystem. 929 */ 930 mp = vfs_mount_alloc(vp, vfsp, fspath, td); 931 VOP_UNLOCK(vp, 0, td); 932 933 /* XXXMAC: pass to vfs_mount_alloc? */ 934 mp->mnt_optnew = fsdata; 935 } 936 937 /* 938 * Set the mount level flags. 939 */ 940 if (fsflags & MNT_RDONLY) 941 mp->mnt_flag |= MNT_RDONLY; 942 mp->mnt_flag &=~ MNT_UPDATEMASK; 943 mp->mnt_flag |= fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS); 944 /* 945 * Mount the filesystem. 946 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 947 * get. No freeing of cn_pnbuf. 948 */ 949 error = VFS_MOUNT(mp, td); 950 951 /* 952 * Process the export option only if we are 953 * updating mount options. 954 */ 955 if (!error && (fsflags & MNT_UPDATE)) { 956 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 957 sizeof(export)) == 0) 958 error = vfs_export(mp, &export); 959 } 960 961 if (!error) { 962 if (mp->mnt_opt != NULL) 963 vfs_freeopts(mp->mnt_opt); 964 mp->mnt_opt = mp->mnt_optnew; 965 (void)VFS_STATFS(mp, &mp->mnt_stat, td); 966 } 967 /* 968 * Prevent external consumers of mount options from reading 969 * mnt_optnew. 970 */ 971 mp->mnt_optnew = NULL; 972 if (mp->mnt_flag & MNT_UPDATE) { 973 mp->mnt_flag &= 974 ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_SNAPSHOT); 975 if (error) { 976 mp->mnt_flag = flag; 977 mp->mnt_kern_flag = kern_flag; 978 } 979 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 980 if (mp->mnt_syncer == NULL) 981 error = vfs_allocate_syncvnode(mp); 982 } else { 983 if (mp->mnt_syncer != NULL) 984 vrele(mp->mnt_syncer); 985 mp->mnt_syncer = NULL; 986 } 987 vfs_unbusy(mp, td); 988 VI_LOCK(vp); 989 vp->v_iflag &= ~VI_MOUNT; 990 VI_UNLOCK(vp); 991 vrele(vp); 992 return (error); 993 } 994 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 995 /* 996 * Put the new filesystem on the mount list after root. 997 */ 998 cache_purge(vp); 999 if (!error) { 1000 struct vnode *newdp; 1001 1002 VI_LOCK(vp); 1003 vp->v_iflag &= ~VI_MOUNT; 1004 VI_UNLOCK(vp); 1005 vp->v_mountedhere = mp; 1006 mtx_lock(&mountlist_mtx); 1007 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1008 mtx_unlock(&mountlist_mtx); 1009 vfs_event_signal(NULL, VQ_MOUNT, 0); 1010 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td)) 1011 panic("mount: lost mount"); 1012 mountcheckdirs(vp, newdp); 1013 vput(newdp); 1014 VOP_UNLOCK(vp, 0, td); 1015 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1016 error = vfs_allocate_syncvnode(mp); 1017 vfs_unbusy(mp, td); 1018 if (error) 1019 vrele(vp); 1020 } else { 1021 VI_LOCK(vp); 1022 vp->v_iflag &= ~VI_MOUNT; 1023 VI_UNLOCK(vp); 1024 vfs_unbusy(mp, td); 1025 vfs_mount_destroy(mp); 1026 vput(vp); 1027 } 1028 return (error); 1029 } 1030 1031 /* 1032 * --------------------------------------------------------------------- 1033 * Unmount a filesystem. 1034 * 1035 * Note: unmount takes a path to the vnode mounted on as argument, 1036 * not special file (as before). 1037 */ 1038 #ifndef _SYS_SYSPROTO_H_ 1039 struct unmount_args { 1040 char *path; 1041 int flags; 1042 }; 1043 #endif 1044 /* ARGSUSED */ 1045 int 1046 unmount(td, uap) 1047 struct thread *td; 1048 register struct unmount_args /* { 1049 char *path; 1050 int flags; 1051 } */ *uap; 1052 { 1053 struct mount *mp; 1054 char *pathbuf; 1055 int error, id0, id1; 1056 1057 if (jailed(td->td_ucred)) 1058 return (EPERM); 1059 if (usermount == 0) { 1060 if ((error = suser(td)) != 0) 1061 return (error); 1062 } 1063 1064 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1065 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1066 if (error) { 1067 free(pathbuf, M_TEMP); 1068 return (error); 1069 } 1070 AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1); 1071 mtx_lock(&Giant); 1072 if (uap->flags & MNT_BYFSID) { 1073 /* Decode the filesystem ID. */ 1074 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1075 mtx_unlock(&Giant); 1076 free(pathbuf, M_TEMP); 1077 return (EINVAL); 1078 } 1079 1080 mtx_lock(&mountlist_mtx); 1081 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1082 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1083 mp->mnt_stat.f_fsid.val[1] == id1) 1084 break; 1085 } 1086 mtx_unlock(&mountlist_mtx); 1087 } else { 1088 mtx_lock(&mountlist_mtx); 1089 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1090 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1091 break; 1092 } 1093 mtx_unlock(&mountlist_mtx); 1094 } 1095 free(pathbuf, M_TEMP); 1096 if (mp == NULL) { 1097 /* 1098 * Previously we returned ENOENT for a nonexistent path and 1099 * EINVAL for a non-mountpoint. We cannot tell these apart 1100 * now, so in the !MNT_BYFSID case return the more likely 1101 * EINVAL for compatibility. 1102 */ 1103 mtx_unlock(&Giant); 1104 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1105 } 1106 1107 /* 1108 * Only privileged root, or (if MNT_USER is set) the user that did the 1109 * original mount is permitted to unmount this filesystem. 1110 */ 1111 error = vfs_suser(mp, td); 1112 if (error) { 1113 mtx_unlock(&Giant); 1114 return (error); 1115 } 1116 1117 /* 1118 * Don't allow unmounting the root filesystem. 1119 */ 1120 if (mp->mnt_flag & MNT_ROOTFS) { 1121 mtx_unlock(&Giant); 1122 return (EINVAL); 1123 } 1124 error = dounmount(mp, uap->flags, td); 1125 mtx_unlock(&Giant); 1126 return (error); 1127 } 1128 1129 /* 1130 * Do the actual filesystem unmount. 1131 */ 1132 int 1133 dounmount(mp, flags, td) 1134 struct mount *mp; 1135 int flags; 1136 struct thread *td; 1137 { 1138 struct vnode *coveredvp, *fsrootvp; 1139 int error; 1140 int async_flag; 1141 1142 mtx_assert(&Giant, MA_OWNED); 1143 1144 if ((coveredvp = mp->mnt_vnodecovered) != NULL) 1145 vn_lock(coveredvp, LK_EXCLUSIVE | LK_RETRY, td); 1146 MNT_ILOCK(mp); 1147 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1148 MNT_IUNLOCK(mp); 1149 if (coveredvp) 1150 VOP_UNLOCK(coveredvp, 0, td); 1151 return (EBUSY); 1152 } 1153 mp->mnt_kern_flag |= MNTK_UNMOUNT; 1154 /* Allow filesystems to detect that a forced unmount is in progress. */ 1155 if (flags & MNT_FORCE) 1156 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1157 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | 1158 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), MNT_MTX(mp), td); 1159 if (error) { 1160 MNT_ILOCK(mp); 1161 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1162 if (mp->mnt_kern_flag & MNTK_MWAIT) 1163 wakeup(mp); 1164 MNT_IUNLOCK(mp); 1165 if (coveredvp) 1166 VOP_UNLOCK(coveredvp, 0, td); 1167 return (error); 1168 } 1169 vn_start_write(NULL, &mp, V_WAIT); 1170 1171 if (mp->mnt_flag & MNT_EXPUBLIC) 1172 vfs_setpublicfs(NULL, NULL, NULL); 1173 1174 vfs_msync(mp, MNT_WAIT); 1175 async_flag = mp->mnt_flag & MNT_ASYNC; 1176 mp->mnt_flag &= ~MNT_ASYNC; 1177 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1178 if (mp->mnt_syncer != NULL) 1179 vrele(mp->mnt_syncer); 1180 /* 1181 * For forced unmounts, move process cdir/rdir refs on the fs root 1182 * vnode to the covered vnode. For non-forced unmounts we want 1183 * such references to cause an EBUSY error. 1184 */ 1185 if ((flags & MNT_FORCE) && 1186 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1187 if (mp->mnt_vnodecovered != NULL) 1188 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1189 if (fsrootvp == rootvnode) { 1190 vrele(rootvnode); 1191 rootvnode = NULL; 1192 } 1193 vput(fsrootvp); 1194 } 1195 if (((mp->mnt_flag & MNT_RDONLY) || 1196 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || 1197 (flags & MNT_FORCE)) { 1198 error = VFS_UNMOUNT(mp, flags, td); 1199 } 1200 vn_finished_write(mp); 1201 if (error) { 1202 /* Undo cdir/rdir and rootvnode changes made above. */ 1203 if ((flags & MNT_FORCE) && 1204 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1205 if (mp->mnt_vnodecovered != NULL) 1206 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1207 if (rootvnode == NULL) { 1208 rootvnode = fsrootvp; 1209 vref(rootvnode); 1210 } 1211 vput(fsrootvp); 1212 } 1213 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 1214 (void) vfs_allocate_syncvnode(mp); 1215 MNT_ILOCK(mp); 1216 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1217 mp->mnt_flag |= async_flag; 1218 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1219 if (mp->mnt_kern_flag & MNTK_MWAIT) 1220 wakeup(mp); 1221 MNT_IUNLOCK(mp); 1222 if (coveredvp) 1223 VOP_UNLOCK(coveredvp, 0, td); 1224 return (error); 1225 } 1226 mtx_lock(&mountlist_mtx); 1227 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1228 mtx_unlock(&mountlist_mtx); 1229 if (coveredvp != NULL) { 1230 coveredvp->v_mountedhere = NULL; 1231 vput(coveredvp); 1232 } 1233 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1234 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1235 vfs_mount_destroy(mp); 1236 return (0); 1237 } 1238 1239 /* 1240 * --------------------------------------------------------------------- 1241 * Mounting of root filesystem 1242 * 1243 */ 1244 1245 struct root_hold_token { 1246 const char *who; 1247 LIST_ENTRY(root_hold_token) list; 1248 }; 1249 1250 static LIST_HEAD(, root_hold_token) root_holds = 1251 LIST_HEAD_INITIALIZER(&root_holds); 1252 1253 struct root_hold_token * 1254 root_mount_hold(const char *identifier) 1255 { 1256 struct root_hold_token *h; 1257 1258 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 1259 h->who = identifier; 1260 mtx_lock(&mountlist_mtx); 1261 LIST_INSERT_HEAD(&root_holds, h, list); 1262 mtx_unlock(&mountlist_mtx); 1263 return (h); 1264 } 1265 1266 void 1267 root_mount_rel(struct root_hold_token *h) 1268 { 1269 1270 mtx_lock(&mountlist_mtx); 1271 LIST_REMOVE(h, list); 1272 wakeup(&root_holds); 1273 mtx_unlock(&mountlist_mtx); 1274 free(h, M_DEVBUF); 1275 } 1276 1277 static void 1278 root_mount_wait(void) 1279 { 1280 struct root_hold_token *h; 1281 1282 for (;;) { 1283 DROP_GIANT(); 1284 g_waitidle(); 1285 PICKUP_GIANT(); 1286 mtx_lock(&mountlist_mtx); 1287 if (LIST_EMPTY(&root_holds)) { 1288 mtx_unlock(&mountlist_mtx); 1289 break; 1290 } 1291 printf("Root mount waiting for:"); 1292 LIST_FOREACH(h, &root_holds, list) 1293 printf(" %s", h->who); 1294 printf("\n"); 1295 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 1296 hz); 1297 } 1298 } 1299 1300 static void 1301 set_rootvnode(struct thread *td) 1302 { 1303 struct proc *p; 1304 1305 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td)) 1306 panic("Cannot find root vnode"); 1307 1308 p = td->td_proc; 1309 FILEDESC_LOCK(p->p_fd); 1310 1311 if (p->p_fd->fd_cdir != NULL) 1312 vrele(p->p_fd->fd_cdir); 1313 p->p_fd->fd_cdir = rootvnode; 1314 VREF(rootvnode); 1315 1316 if (p->p_fd->fd_rdir != NULL) 1317 vrele(p->p_fd->fd_rdir); 1318 p->p_fd->fd_rdir = rootvnode; 1319 VREF(rootvnode); 1320 1321 FILEDESC_UNLOCK(p->p_fd); 1322 1323 VOP_UNLOCK(rootvnode, 0, td); 1324 } 1325 1326 /* 1327 * Mount /devfs as our root filesystem, but do not put it on the mountlist 1328 * yet. Create a /dev -> / symlink so that absolute pathnames will lookup. 1329 */ 1330 1331 static void 1332 devfs_first(void) 1333 { 1334 struct thread *td = curthread; 1335 struct vfsoptlist *opts; 1336 struct vfsconf *vfsp; 1337 struct mount *mp = NULL; 1338 int error; 1339 1340 vfsp = vfs_byname("devfs"); 1341 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 1342 if (vfsp == NULL) 1343 return; 1344 1345 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td); 1346 1347 error = VFS_MOUNT(mp, td); 1348 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 1349 if (error) 1350 return; 1351 1352 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 1353 TAILQ_INIT(opts); 1354 mp->mnt_opt = opts; 1355 1356 mtx_lock(&mountlist_mtx); 1357 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 1358 mtx_unlock(&mountlist_mtx); 1359 1360 set_rootvnode(td); 1361 1362 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 1363 if (error) 1364 printf("kern_symlink /dev -> / returns %d\n", error); 1365 } 1366 1367 /* 1368 * Surgically move our devfs to be mounted on /dev. 1369 */ 1370 1371 static void 1372 devfs_fixup(struct thread *td) 1373 { 1374 struct nameidata nd; 1375 int error; 1376 struct vnode *vp, *dvp; 1377 struct mount *mp; 1378 1379 /* Remove our devfs mount from the mountlist and purge the cache */ 1380 mtx_lock(&mountlist_mtx); 1381 mp = TAILQ_FIRST(&mountlist); 1382 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1383 mtx_unlock(&mountlist_mtx); 1384 cache_purgevfs(mp); 1385 1386 VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td); 1387 VI_LOCK(dvp); 1388 dvp->v_iflag &= ~VI_MOUNT; 1389 dvp->v_mountedhere = NULL; 1390 VI_UNLOCK(dvp); 1391 1392 /* Set up the real rootvnode, and purge the cache */ 1393 TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL; 1394 set_rootvnode(td); 1395 cache_purgevfs(rootvnode->v_mount); 1396 1397 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 1398 error = namei(&nd); 1399 if (error) { 1400 printf("Lookup of /dev for devfs, error: %d\n", error); 1401 return; 1402 } 1403 NDFREE(&nd, NDF_ONLY_PNBUF); 1404 vp = nd.ni_vp; 1405 if (vp->v_type != VDIR) { 1406 vput(vp); 1407 } 1408 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 1409 if (error) { 1410 vput(vp); 1411 } 1412 cache_purge(vp); 1413 mp->mnt_vnodecovered = vp; 1414 vp->v_mountedhere = mp; 1415 mtx_lock(&mountlist_mtx); 1416 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1417 mtx_unlock(&mountlist_mtx); 1418 VOP_UNLOCK(vp, 0, td); 1419 vput(dvp); 1420 vfs_unbusy(mp, td); 1421 1422 /* Unlink the no longer needed /dev/dev -> / symlink */ 1423 kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 1424 } 1425 1426 /* 1427 * Report errors during filesystem mounting. 1428 */ 1429 void 1430 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1431 { 1432 struct vfsoptlist *moptlist = mp->mnt_optnew; 1433 va_list ap; 1434 int error, len; 1435 char *errmsg; 1436 1437 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1438 if (error || errmsg == NULL || len <= 0) 1439 return; 1440 1441 va_start(ap, fmt); 1442 vsnprintf(errmsg, (size_t)len, fmt, ap); 1443 va_end(ap); 1444 } 1445 1446 /* 1447 * Find and mount the root filesystem 1448 */ 1449 void 1450 vfs_mountroot(void) 1451 { 1452 char *cp; 1453 int error, i, asked = 0; 1454 1455 root_mount_wait(); 1456 1457 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), 1458 NULL, NULL, mount_init, mount_fini, 1459 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1460 devfs_first(); 1461 1462 /* 1463 * We are booted with instructions to prompt for the root filesystem. 1464 */ 1465 if (boothowto & RB_ASKNAME) { 1466 if (!vfs_mountroot_ask()) 1467 return; 1468 asked = 1; 1469 } 1470 1471 /* 1472 * The root filesystem information is compiled in, and we are 1473 * booted with instructions to use it. 1474 */ 1475 if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) { 1476 if (!vfs_mountroot_try(ctrootdevname)) 1477 return; 1478 ctrootdevname = NULL; 1479 } 1480 1481 /* 1482 * We've been given the generic "use CDROM as root" flag. This is 1483 * necessary because one media may be used in many different 1484 * devices, so we need to search for them. 1485 */ 1486 if (boothowto & RB_CDROM) { 1487 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 1488 if (!vfs_mountroot_try(cdrom_rootdevnames[i])) 1489 return; 1490 } 1491 } 1492 1493 /* 1494 * Try to use the value read by the loader from /etc/fstab, or 1495 * supplied via some other means. This is the preferred 1496 * mechanism. 1497 */ 1498 cp = getenv("vfs.root.mountfrom"); 1499 if (cp != NULL) { 1500 error = vfs_mountroot_try(cp); 1501 freeenv(cp); 1502 if (!error) 1503 return; 1504 } 1505 1506 /* 1507 * Try values that may have been computed by code during boot 1508 */ 1509 if (!vfs_mountroot_try(rootdevnames[0])) 1510 return; 1511 if (!vfs_mountroot_try(rootdevnames[1])) 1512 return; 1513 1514 /* 1515 * If we (still) have a compiled-in default, try it. 1516 */ 1517 if (ctrootdevname != NULL) 1518 if (!vfs_mountroot_try(ctrootdevname)) 1519 return; 1520 /* 1521 * Everything so far has failed, prompt on the console if we haven't 1522 * already tried that. 1523 */ 1524 if (!asked) 1525 if (!vfs_mountroot_ask()) 1526 return; 1527 1528 panic("Root mount failed, startup aborted."); 1529 } 1530 1531 /* 1532 * Mount (mountfrom) as the root filesystem. 1533 */ 1534 static int 1535 vfs_mountroot_try(const char *mountfrom) 1536 { 1537 struct mount *mp; 1538 char *vfsname, *path; 1539 time_t timebase; 1540 int error; 1541 char patt[32]; 1542 1543 vfsname = NULL; 1544 path = NULL; 1545 mp = NULL; 1546 error = EINVAL; 1547 1548 if (mountfrom == NULL) 1549 return (error); /* don't complain */ 1550 printf("Trying to mount root from %s\n", mountfrom); 1551 1552 /* parse vfs name and path */ 1553 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1554 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 1555 vfsname[0] = path[0] = 0; 1556 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 1557 if (sscanf(mountfrom, patt, vfsname, path) < 1) 1558 goto out; 1559 1560 if (path[0] == '\0') 1561 strcpy(path, ROOTNAME); 1562 1563 error = kernel_vmount( 1564 MNT_RDONLY | MNT_ROOTFS, 1565 "fstype", vfsname, 1566 "fspath", "/", 1567 "from", path, 1568 NULL); 1569 if (error == 0) { 1570 /* 1571 * We mount devfs prior to mounting the / FS, so the first 1572 * entry will typically be devfs. 1573 */ 1574 mp = TAILQ_FIRST(&mountlist); 1575 KASSERT(mp != NULL, ("%s: mountlist is empty", __func__)); 1576 1577 /* 1578 * Iterate over all currently mounted file systems and use 1579 * the time stamp found to check and/or initialize the RTC. 1580 * Typically devfs has no time stamp and the only other FS 1581 * is the actual / FS. 1582 * Call inittodr() only once and pass it the largest of the 1583 * timestamps we encounter. 1584 */ 1585 timebase = 0; 1586 do { 1587 if (mp->mnt_time > timebase) 1588 timebase = mp->mnt_time; 1589 mp = TAILQ_NEXT(mp, mnt_list); 1590 } while (mp != NULL); 1591 inittodr(timebase); 1592 1593 devfs_fixup(curthread); 1594 } 1595 out: 1596 free(path, M_MOUNT); 1597 free(vfsname, M_MOUNT); 1598 return (error); 1599 } 1600 1601 /* 1602 * --------------------------------------------------------------------- 1603 * Interactive root filesystem selection code. 1604 */ 1605 1606 static int 1607 vfs_mountroot_ask(void) 1608 { 1609 char name[128]; 1610 1611 for(;;) { 1612 printf("\nManual root filesystem specification:\n"); 1613 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 1614 #if defined(__amd64__) || defined(__i386__) || defined(__ia64__) 1615 printf(" eg. ufs:da0s1a\n"); 1616 #else 1617 printf(" eg. ufs:/dev/da0a\n"); 1618 #endif 1619 printf(" ? List valid disk boot devices\n"); 1620 printf(" <empty line> Abort manual input\n"); 1621 printf("\nmountroot> "); 1622 gets(name, sizeof(name), 1); 1623 if (name[0] == '\0') 1624 return (1); 1625 if (name[0] == '?') { 1626 printf("\nList of GEOM managed disk devices:\n "); 1627 g_dev_print(); 1628 continue; 1629 } 1630 if (!vfs_mountroot_try(name)) 1631 return (0); 1632 } 1633 } 1634 1635 /* 1636 * --------------------------------------------------------------------- 1637 * Functions for querying mount options/arguments from filesystems. 1638 */ 1639 1640 /* 1641 * Check that no unknown options are given 1642 */ 1643 int 1644 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1645 { 1646 struct vfsopt *opt; 1647 const char **t, *p; 1648 1649 1650 TAILQ_FOREACH(opt, opts, link) { 1651 p = opt->name; 1652 if (p[0] == 'n' && p[1] == 'o') 1653 p += 2; 1654 for(t = global_opts; *t != NULL; t++) 1655 if (!strcmp(*t, p)) 1656 break; 1657 if (*t != NULL) 1658 continue; 1659 for(t = legal; *t != NULL; t++) 1660 if (!strcmp(*t, p)) 1661 break; 1662 if (*t != NULL) 1663 continue; 1664 printf("mount option <%s> is unknown\n", p); 1665 return (EINVAL); 1666 } 1667 return (0); 1668 } 1669 1670 /* 1671 * Get a mount option by its name. 1672 * 1673 * Return 0 if the option was found, ENOENT otherwise. 1674 * If len is non-NULL it will be filled with the length 1675 * of the option. If buf is non-NULL, it will be filled 1676 * with the address of the option. 1677 */ 1678 int 1679 vfs_getopt(opts, name, buf, len) 1680 struct vfsoptlist *opts; 1681 const char *name; 1682 void **buf; 1683 int *len; 1684 { 1685 struct vfsopt *opt; 1686 1687 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1688 1689 TAILQ_FOREACH(opt, opts, link) { 1690 if (strcmp(name, opt->name) == 0) { 1691 if (len != NULL) 1692 *len = opt->len; 1693 if (buf != NULL) 1694 *buf = opt->value; 1695 return (0); 1696 } 1697 } 1698 return (ENOENT); 1699 } 1700 1701 static int 1702 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1703 { 1704 struct vfsopt *opt; 1705 int i; 1706 1707 if (opts == NULL) 1708 return (-1); 1709 1710 i = 0; 1711 TAILQ_FOREACH(opt, opts, link) { 1712 if (strcmp(name, opt->name) == 0) 1713 return (i); 1714 ++i; 1715 } 1716 return (-1); 1717 } 1718 1719 char * 1720 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1721 { 1722 struct vfsopt *opt; 1723 1724 *error = 0; 1725 TAILQ_FOREACH(opt, opts, link) { 1726 if (strcmp(name, opt->name) != 0) 1727 continue; 1728 if (((char *)opt->value)[opt->len - 1] != '\0') { 1729 *error = EINVAL; 1730 return (NULL); 1731 } 1732 return (opt->value); 1733 } 1734 return (NULL); 1735 } 1736 1737 int 1738 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1739 { 1740 struct vfsopt *opt; 1741 1742 TAILQ_FOREACH(opt, opts, link) { 1743 if (strcmp(name, opt->name) == 0) { 1744 if (w != NULL) 1745 *w |= val; 1746 return (1); 1747 } 1748 } 1749 if (w != NULL) 1750 *w &= ~val; 1751 return (0); 1752 } 1753 1754 int 1755 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1756 { 1757 va_list ap; 1758 struct vfsopt *opt; 1759 int ret; 1760 1761 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1762 1763 TAILQ_FOREACH(opt, opts, link) { 1764 if (strcmp(name, opt->name) != 0) 1765 continue; 1766 if (((char *)opt->value)[opt->len - 1] != '\0') 1767 return (0); 1768 va_start(ap, fmt); 1769 ret = vsscanf(opt->value, fmt, ap); 1770 va_end(ap); 1771 return (ret); 1772 } 1773 return (0); 1774 } 1775 1776 /* 1777 * Find and copy a mount option. 1778 * 1779 * The size of the buffer has to be specified 1780 * in len, if it is not the same length as the 1781 * mount option, EINVAL is returned. 1782 * Returns ENOENT if the option is not found. 1783 */ 1784 int 1785 vfs_copyopt(opts, name, dest, len) 1786 struct vfsoptlist *opts; 1787 const char *name; 1788 void *dest; 1789 int len; 1790 { 1791 struct vfsopt *opt; 1792 1793 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1794 1795 TAILQ_FOREACH(opt, opts, link) { 1796 if (strcmp(name, opt->name) == 0) { 1797 if (len != opt->len) 1798 return (EINVAL); 1799 bcopy(opt->value, dest, opt->len); 1800 return (0); 1801 } 1802 } 1803 return (ENOENT); 1804 } 1805 1806 /* 1807 * This is a helper function for filesystems to traverse their 1808 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1809 */ 1810 1811 struct vnode * 1812 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1813 { 1814 struct vnode *vp; 1815 1816 mtx_assert(MNT_MTX(mp), MA_OWNED); 1817 1818 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1819 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1820 while (vp != NULL && vp->v_type == VMARKER) 1821 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1822 1823 /* Check if we are done */ 1824 if (vp == NULL) { 1825 __mnt_vnode_markerfree(mvp, mp); 1826 return (NULL); 1827 } 1828 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1829 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1830 return (vp); 1831 } 1832 1833 struct vnode * 1834 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1835 { 1836 struct vnode *vp; 1837 1838 mtx_assert(MNT_MTX(mp), MA_OWNED); 1839 1840 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1841 while (vp != NULL && vp->v_type == VMARKER) 1842 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1843 1844 /* Check if we are done */ 1845 if (vp == NULL) { 1846 *mvp = NULL; 1847 return (NULL); 1848 } 1849 mp->mnt_holdcnt++; 1850 MNT_IUNLOCK(mp); 1851 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1852 M_VNODE_MARKER, 1853 M_WAITOK | M_ZERO); 1854 MNT_ILOCK(mp); 1855 (*mvp)->v_type = VMARKER; 1856 1857 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1858 while (vp != NULL && vp->v_type == VMARKER) 1859 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1860 1861 /* Check if we are done */ 1862 if (vp == NULL) { 1863 MNT_IUNLOCK(mp); 1864 free(*mvp, M_VNODE_MARKER); 1865 MNT_ILOCK(mp); 1866 *mvp = NULL; 1867 mp->mnt_holdcnt--; 1868 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1869 wakeup(&mp->mnt_holdcnt); 1870 return (NULL); 1871 } 1872 mp->mnt_markercnt++; 1873 (*mvp)->v_mount = mp; 1874 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1875 return (vp); 1876 } 1877 1878 1879 void 1880 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1881 { 1882 1883 if (*mvp == NULL) 1884 return; 1885 1886 mtx_assert(MNT_MTX(mp), MA_OWNED); 1887 1888 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1889 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1890 MNT_IUNLOCK(mp); 1891 free(*mvp, M_VNODE_MARKER); 1892 MNT_ILOCK(mp); 1893 *mvp = NULL; 1894 1895 mp->mnt_markercnt--; 1896 mp->mnt_holdcnt--; 1897 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1898 wakeup(&mp->mnt_holdcnt); 1899 } 1900 1901 1902 int 1903 __vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 1904 { 1905 int error; 1906 1907 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td); 1908 if (sbp != &mp->mnt_stat) 1909 *sbp = mp->mnt_stat; 1910 return (error); 1911 } 1912 1913 void 1914 vfs_mountedfrom(struct mount *mp, const char *from) 1915 { 1916 1917 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1918 strlcpy(mp->mnt_stat.f_mntfromname, from, 1919 sizeof mp->mnt_stat.f_mntfromname); 1920 } 1921 1922 /* 1923 * --------------------------------------------------------------------- 1924 * This is the api for building mount args and mounting filesystems from 1925 * inside the kernel. 1926 * 1927 * The API works by accumulation of individual args. First error is 1928 * latched. 1929 * 1930 * XXX: should be documented in new manpage kernel_mount(9) 1931 */ 1932 1933 /* A memory allocation which must be freed when we are done */ 1934 struct mntaarg { 1935 SLIST_ENTRY(mntaarg) next; 1936 }; 1937 1938 /* The header for the mount arguments */ 1939 struct mntarg { 1940 struct iovec *v; 1941 int len; 1942 int error; 1943 SLIST_HEAD(, mntaarg) list; 1944 }; 1945 1946 /* 1947 * Add a boolean argument. 1948 * 1949 * flag is the boolean value. 1950 * name must start with "no". 1951 */ 1952 struct mntarg * 1953 mount_argb(struct mntarg *ma, int flag, const char *name) 1954 { 1955 1956 KASSERT(name[0] == 'n' && name[1] == 'o', 1957 ("mount_argb(...,%s): name must start with 'no'", name)); 1958 1959 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1960 } 1961 1962 /* 1963 * Add an argument printf style 1964 */ 1965 struct mntarg * 1966 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1967 { 1968 va_list ap; 1969 struct mntaarg *maa; 1970 struct sbuf *sb; 1971 int len; 1972 1973 if (ma == NULL) { 1974 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1975 SLIST_INIT(&ma->list); 1976 } 1977 if (ma->error) 1978 return (ma); 1979 1980 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1981 M_MOUNT, M_WAITOK); 1982 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1983 ma->v[ma->len].iov_len = strlen(name) + 1; 1984 ma->len++; 1985 1986 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 1987 va_start(ap, fmt); 1988 sbuf_vprintf(sb, fmt, ap); 1989 va_end(ap); 1990 sbuf_finish(sb); 1991 len = sbuf_len(sb) + 1; 1992 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1993 SLIST_INSERT_HEAD(&ma->list, maa, next); 1994 bcopy(sbuf_data(sb), maa + 1, len); 1995 sbuf_delete(sb); 1996 1997 ma->v[ma->len].iov_base = maa + 1; 1998 ma->v[ma->len].iov_len = len; 1999 ma->len++; 2000 2001 return (ma); 2002 } 2003 2004 /* 2005 * Add an argument which is a userland string. 2006 */ 2007 struct mntarg * 2008 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 2009 { 2010 struct mntaarg *maa; 2011 char *tbuf; 2012 2013 if (val == NULL) 2014 return (ma); 2015 if (ma == NULL) { 2016 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2017 SLIST_INIT(&ma->list); 2018 } 2019 if (ma->error) 2020 return (ma); 2021 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2022 SLIST_INSERT_HEAD(&ma->list, maa, next); 2023 tbuf = (void *)(maa + 1); 2024 ma->error = copyinstr(val, tbuf, len, NULL); 2025 return (mount_arg(ma, name, tbuf, -1)); 2026 } 2027 2028 /* 2029 * Plain argument. 2030 * 2031 * If length is -1, use printf. 2032 */ 2033 struct mntarg * 2034 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 2035 { 2036 2037 if (ma == NULL) { 2038 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2039 SLIST_INIT(&ma->list); 2040 } 2041 if (ma->error) 2042 return (ma); 2043 2044 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2045 M_MOUNT, M_WAITOK); 2046 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2047 ma->v[ma->len].iov_len = strlen(name) + 1; 2048 ma->len++; 2049 2050 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 2051 if (len < 0) 2052 ma->v[ma->len].iov_len = strlen(val) + 1; 2053 else 2054 ma->v[ma->len].iov_len = len; 2055 ma->len++; 2056 return (ma); 2057 } 2058 2059 /* 2060 * Free a mntarg structure 2061 */ 2062 static void 2063 free_mntarg(struct mntarg *ma) 2064 { 2065 struct mntaarg *maa; 2066 2067 while (!SLIST_EMPTY(&ma->list)) { 2068 maa = SLIST_FIRST(&ma->list); 2069 SLIST_REMOVE_HEAD(&ma->list, next); 2070 free(maa, M_MOUNT); 2071 } 2072 free(ma->v, M_MOUNT); 2073 free(ma, M_MOUNT); 2074 } 2075 2076 /* 2077 * Mount a filesystem 2078 */ 2079 int 2080 kernel_mount(struct mntarg *ma, int flags) 2081 { 2082 struct uio auio; 2083 int error; 2084 2085 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2086 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2087 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2088 2089 auio.uio_iov = ma->v; 2090 auio.uio_iovcnt = ma->len; 2091 auio.uio_segflg = UIO_SYSSPACE; 2092 2093 error = ma->error; 2094 if (!error) 2095 error = vfs_donmount(curthread, flags, &auio); 2096 free_mntarg(ma); 2097 return (error); 2098 } 2099 2100 /* 2101 * A printflike function to mount a filesystem. 2102 */ 2103 int 2104 kernel_vmount(int flags, ...) 2105 { 2106 struct mntarg *ma = NULL; 2107 va_list ap; 2108 const char *cp; 2109 const void *vp; 2110 int error; 2111 2112 va_start(ap, flags); 2113 for (;;) { 2114 cp = va_arg(ap, const char *); 2115 if (cp == NULL) 2116 break; 2117 vp = va_arg(ap, const void *); 2118 ma = mount_arg(ma, cp, vp, -1); 2119 } 2120 va_end(ap); 2121 2122 error = kernel_mount(ma, flags); 2123 return (error); 2124 } 2125