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 * 3. 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/fcntl.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/filedesc.h> 53 #include <sys/reboot.h> 54 #include <sys/sbuf.h> 55 #include <sys/syscallsubr.h> 56 #include <sys/sysproto.h> 57 #include <sys/sx.h> 58 #include <sys/sysctl.h> 59 #include <sys/sysent.h> 60 #include <sys/systm.h> 61 #include <sys/vnode.h> 62 #include <vm/uma.h> 63 64 #include <geom/geom.h> 65 66 #include <machine/stdarg.h> 67 68 #include <security/audit/audit.h> 69 #include <security/mac/mac_framework.h> 70 71 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 72 73 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 74 uint64_t fsflags, struct vfsoptlist **optlist); 75 static void free_mntarg(struct mntarg *ma); 76 77 static int usermount = 0; 78 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 79 "Unprivileged users may mount and unmount file systems"); 80 81 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 82 static uma_zone_t mount_zone; 83 84 /* List of mounted filesystems. */ 85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87 /* For any iteration/modification of mountlist */ 88 struct mtx mountlist_mtx; 89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91 /* 92 * Global opts, taken by all filesystems 93 */ 94 static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103 }; 104 105 static int 106 mount_init(void *mem, int size, int flags) 107 { 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 113 return (0); 114 } 115 116 static void 117 mount_fini(void *mem, int size) 118 { 119 struct mount *mp; 120 121 mp = (struct mount *)mem; 122 lockdestroy(&mp->mnt_explock); 123 mtx_destroy(&mp->mnt_mtx); 124 } 125 126 static void 127 vfs_mount_init(void *dummy __unused) 128 { 129 130 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 131 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 132 } 133 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 134 135 /* 136 * --------------------------------------------------------------------- 137 * Functions for building and sanitizing the mount options 138 */ 139 140 /* Remove one mount option. */ 141 static void 142 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 143 { 144 145 TAILQ_REMOVE(opts, opt, link); 146 free(opt->name, M_MOUNT); 147 if (opt->value != NULL) 148 free(opt->value, M_MOUNT); 149 free(opt, M_MOUNT); 150 } 151 152 /* Release all resources related to the mount options. */ 153 void 154 vfs_freeopts(struct vfsoptlist *opts) 155 { 156 struct vfsopt *opt; 157 158 while (!TAILQ_EMPTY(opts)) { 159 opt = TAILQ_FIRST(opts); 160 vfs_freeopt(opts, opt); 161 } 162 free(opts, M_MOUNT); 163 } 164 165 void 166 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 167 { 168 struct vfsopt *opt, *temp; 169 170 if (opts == NULL) 171 return; 172 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 173 if (strcmp(opt->name, name) == 0) 174 vfs_freeopt(opts, opt); 175 } 176 } 177 178 static int 179 vfs_isopt_ro(const char *opt) 180 { 181 182 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 183 strcmp(opt, "norw") == 0) 184 return (1); 185 return (0); 186 } 187 188 static int 189 vfs_isopt_rw(const char *opt) 190 { 191 192 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 193 return (1); 194 return (0); 195 } 196 197 /* 198 * Check if options are equal (with or without the "no" prefix). 199 */ 200 static int 201 vfs_equalopts(const char *opt1, const char *opt2) 202 { 203 char *p; 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 while ((p = strchr(opt1, '.')) != NULL && 215 !strncmp(opt1, opt2, ++p - opt1)) { 216 opt2 += p - opt1; 217 opt1 = p; 218 /* "foo.noopt" vs. "foo.opt" */ 219 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 220 return (1); 221 /* "foo.opt" vs. "foo.noopt" */ 222 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 223 return (1); 224 } 225 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 226 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 227 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 228 return (1); 229 return (0); 230 } 231 232 /* 233 * If a mount option is specified several times, 234 * (with or without the "no" prefix) only keep 235 * the last occurrence of it. 236 */ 237 static void 238 vfs_sanitizeopts(struct vfsoptlist *opts) 239 { 240 struct vfsopt *opt, *opt2, *tmp; 241 242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 243 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 244 while (opt2 != NULL) { 245 if (vfs_equalopts(opt->name, opt2->name)) { 246 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 247 vfs_freeopt(opts, opt2); 248 opt2 = tmp; 249 } else { 250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 251 } 252 } 253 } 254 } 255 256 /* 257 * Build a linked list of mount options from a struct uio. 258 */ 259 int 260 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 261 { 262 struct vfsoptlist *opts; 263 struct vfsopt *opt; 264 size_t memused, namelen, optlen; 265 unsigned int i, iovcnt; 266 int error; 267 268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 269 TAILQ_INIT(opts); 270 memused = 0; 271 iovcnt = auio->uio_iovcnt; 272 for (i = 0; i < iovcnt; i += 2) { 273 namelen = auio->uio_iov[i].iov_len; 274 optlen = auio->uio_iov[i + 1].iov_len; 275 memused += sizeof(struct vfsopt) + optlen + namelen; 276 /* 277 * Avoid consuming too much memory, and attempts to overflow 278 * memused. 279 */ 280 if (memused > VFS_MOUNTARG_SIZE_MAX || 281 optlen > VFS_MOUNTARG_SIZE_MAX || 282 namelen > VFS_MOUNTARG_SIZE_MAX) { 283 error = EINVAL; 284 goto bad; 285 } 286 287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 289 opt->value = NULL; 290 opt->len = 0; 291 opt->pos = i / 2; 292 opt->seen = 0; 293 294 /* 295 * Do this early, so jumps to "bad" will free the current 296 * option. 297 */ 298 TAILQ_INSERT_TAIL(opts, opt, link); 299 300 if (auio->uio_segflg == UIO_SYSSPACE) { 301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 302 } else { 303 error = copyin(auio->uio_iov[i].iov_base, opt->name, 304 namelen); 305 if (error) 306 goto bad; 307 } 308 /* Ensure names are null-terminated strings. */ 309 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 310 error = EINVAL; 311 goto bad; 312 } 313 if (optlen != 0) { 314 opt->len = optlen; 315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 316 if (auio->uio_segflg == UIO_SYSSPACE) { 317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 318 optlen); 319 } else { 320 error = copyin(auio->uio_iov[i + 1].iov_base, 321 opt->value, optlen); 322 if (error) 323 goto bad; 324 } 325 } 326 } 327 vfs_sanitizeopts(opts); 328 *options = opts; 329 return (0); 330 bad: 331 vfs_freeopts(opts); 332 return (error); 333 } 334 335 /* 336 * Merge the old mount options with the new ones passed 337 * in the MNT_UPDATE case. 338 * 339 * XXX: This function will keep a "nofoo" option in the new 340 * options. E.g, if the option's canonical name is "foo", 341 * "nofoo" ends up in the mount point's active options. 342 */ 343 static void 344 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 345 { 346 struct vfsopt *opt, *new; 347 348 TAILQ_FOREACH(opt, oldopts, link) { 349 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 350 new->name = strdup(opt->name, M_MOUNT); 351 if (opt->len != 0) { 352 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 353 bcopy(opt->value, new->value, opt->len); 354 } else 355 new->value = NULL; 356 new->len = opt->len; 357 new->seen = opt->seen; 358 TAILQ_INSERT_HEAD(toopts, new, link); 359 } 360 vfs_sanitizeopts(toopts); 361 } 362 363 /* 364 * Mount a filesystem. 365 */ 366 int 367 sys_nmount(td, uap) 368 struct thread *td; 369 struct nmount_args /* { 370 struct iovec *iovp; 371 unsigned int iovcnt; 372 int flags; 373 } */ *uap; 374 { 375 struct uio *auio; 376 int error; 377 u_int iovcnt; 378 uint64_t flags; 379 380 /* 381 * Mount flags are now 64-bits. On 32-bit archtectures only 382 * 32-bits are passed in, but from here on everything handles 383 * 64-bit flags correctly. 384 */ 385 flags = uap->flags; 386 387 AUDIT_ARG_FFLAGS(flags); 388 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 389 uap->iovp, uap->iovcnt, flags); 390 391 /* 392 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 393 * userspace to set this flag, but we must filter it out if we want 394 * MNT_UPDATE on the root file system to work. 395 * MNT_ROOTFS should only be set by the kernel when mounting its 396 * root file system. 397 */ 398 flags &= ~MNT_ROOTFS; 399 400 iovcnt = uap->iovcnt; 401 /* 402 * Check that we have an even number of iovec's 403 * and that we have at least two options. 404 */ 405 if ((iovcnt & 1) || (iovcnt < 4)) { 406 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 407 uap->iovcnt); 408 return (EINVAL); 409 } 410 411 error = copyinuio(uap->iovp, iovcnt, &auio); 412 if (error) { 413 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 414 __func__, error); 415 return (error); 416 } 417 error = vfs_donmount(td, flags, auio); 418 419 free(auio, M_IOV); 420 return (error); 421 } 422 423 /* 424 * --------------------------------------------------------------------- 425 * Various utility functions 426 */ 427 428 void 429 vfs_ref(struct mount *mp) 430 { 431 432 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 433 MNT_ILOCK(mp); 434 MNT_REF(mp); 435 MNT_IUNLOCK(mp); 436 } 437 438 void 439 vfs_rel(struct mount *mp) 440 { 441 442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 443 MNT_ILOCK(mp); 444 MNT_REL(mp); 445 MNT_IUNLOCK(mp); 446 } 447 448 /* 449 * Allocate and initialize the mount point struct. 450 */ 451 struct mount * 452 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 453 struct ucred *cred) 454 { 455 struct mount *mp; 456 457 mp = uma_zalloc(mount_zone, M_WAITOK); 458 bzero(&mp->mnt_startzero, 459 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 460 TAILQ_INIT(&mp->mnt_nvnodelist); 461 mp->mnt_nvnodelistsize = 0; 462 TAILQ_INIT(&mp->mnt_activevnodelist); 463 mp->mnt_activevnodelistsize = 0; 464 mp->mnt_ref = 0; 465 (void) vfs_busy(mp, MBF_NOWAIT); 466 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 467 mp->mnt_op = vfsp->vfc_vfsops; 468 mp->mnt_vfc = vfsp; 469 mp->mnt_stat.f_type = vfsp->vfc_typenum; 470 mp->mnt_gen++; 471 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 472 mp->mnt_vnodecovered = vp; 473 mp->mnt_cred = crdup(cred); 474 mp->mnt_stat.f_owner = cred->cr_uid; 475 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 476 mp->mnt_iosize_max = DFLTPHYS; 477 #ifdef MAC 478 mac_mount_init(mp); 479 mac_mount_create(cred, mp); 480 #endif 481 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 482 TAILQ_INIT(&mp->mnt_uppers); 483 return (mp); 484 } 485 486 /* 487 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 488 */ 489 void 490 vfs_mount_destroy(struct mount *mp) 491 { 492 493 MNT_ILOCK(mp); 494 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 495 if (mp->mnt_kern_flag & MNTK_MWAIT) { 496 mp->mnt_kern_flag &= ~MNTK_MWAIT; 497 wakeup(mp); 498 } 499 while (mp->mnt_ref) 500 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 501 KASSERT(mp->mnt_ref == 0, 502 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 503 __FILE__, __LINE__)); 504 if (mp->mnt_writeopcount != 0) 505 panic("vfs_mount_destroy: nonzero writeopcount"); 506 if (mp->mnt_secondary_writes != 0) 507 panic("vfs_mount_destroy: nonzero secondary_writes"); 508 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 509 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 510 struct vnode *vp; 511 512 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 513 vn_printf(vp, "dangling vnode "); 514 panic("unmount: dangling vnode"); 515 } 516 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 517 if (mp->mnt_nvnodelistsize != 0) 518 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 519 if (mp->mnt_activevnodelistsize != 0) 520 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 521 if (mp->mnt_lockref != 0) 522 panic("vfs_mount_destroy: nonzero lock refcount"); 523 MNT_IUNLOCK(mp); 524 #ifdef MAC 525 mac_mount_destroy(mp); 526 #endif 527 if (mp->mnt_opt != NULL) 528 vfs_freeopts(mp->mnt_opt); 529 crfree(mp->mnt_cred); 530 uma_zfree(mount_zone, mp); 531 } 532 533 int 534 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 535 { 536 struct vfsoptlist *optlist; 537 struct vfsopt *opt, *tmp_opt; 538 char *fstype, *fspath, *errmsg; 539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 540 541 errmsg = fspath = NULL; 542 errmsg_len = fspathlen = 0; 543 errmsg_pos = -1; 544 545 error = vfs_buildopts(fsoptions, &optlist); 546 if (error) 547 return (error); 548 549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 551 552 /* 553 * We need these two options before the others, 554 * and they are mandatory for any filesystem. 555 * Ensure they are NUL terminated as well. 556 */ 557 fstypelen = 0; 558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 559 if (error || fstype[fstypelen - 1] != '\0') { 560 error = EINVAL; 561 if (errmsg != NULL) 562 strncpy(errmsg, "Invalid fstype", errmsg_len); 563 goto bail; 564 } 565 fspathlen = 0; 566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 567 if (error || fspath[fspathlen - 1] != '\0') { 568 error = EINVAL; 569 if (errmsg != NULL) 570 strncpy(errmsg, "Invalid fspath", errmsg_len); 571 goto bail; 572 } 573 574 /* 575 * We need to see if we have the "update" option 576 * before we call vfs_domount(), since vfs_domount() has special 577 * logic based on MNT_UPDATE. This is very important 578 * when we want to update the root filesystem. 579 */ 580 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 581 if (strcmp(opt->name, "update") == 0) { 582 fsflags |= MNT_UPDATE; 583 vfs_freeopt(optlist, opt); 584 } 585 else if (strcmp(opt->name, "async") == 0) 586 fsflags |= MNT_ASYNC; 587 else if (strcmp(opt->name, "force") == 0) { 588 fsflags |= MNT_FORCE; 589 vfs_freeopt(optlist, opt); 590 } 591 else if (strcmp(opt->name, "reload") == 0) { 592 fsflags |= MNT_RELOAD; 593 vfs_freeopt(optlist, opt); 594 } 595 else if (strcmp(opt->name, "multilabel") == 0) 596 fsflags |= MNT_MULTILABEL; 597 else if (strcmp(opt->name, "noasync") == 0) 598 fsflags &= ~MNT_ASYNC; 599 else if (strcmp(opt->name, "noatime") == 0) 600 fsflags |= MNT_NOATIME; 601 else if (strcmp(opt->name, "atime") == 0) { 602 free(opt->name, M_MOUNT); 603 opt->name = strdup("nonoatime", M_MOUNT); 604 } 605 else if (strcmp(opt->name, "noclusterr") == 0) 606 fsflags |= MNT_NOCLUSTERR; 607 else if (strcmp(opt->name, "clusterr") == 0) { 608 free(opt->name, M_MOUNT); 609 opt->name = strdup("nonoclusterr", M_MOUNT); 610 } 611 else if (strcmp(opt->name, "noclusterw") == 0) 612 fsflags |= MNT_NOCLUSTERW; 613 else if (strcmp(opt->name, "clusterw") == 0) { 614 free(opt->name, M_MOUNT); 615 opt->name = strdup("nonoclusterw", M_MOUNT); 616 } 617 else if (strcmp(opt->name, "noexec") == 0) 618 fsflags |= MNT_NOEXEC; 619 else if (strcmp(opt->name, "exec") == 0) { 620 free(opt->name, M_MOUNT); 621 opt->name = strdup("nonoexec", M_MOUNT); 622 } 623 else if (strcmp(opt->name, "nosuid") == 0) 624 fsflags |= MNT_NOSUID; 625 else if (strcmp(opt->name, "suid") == 0) { 626 free(opt->name, M_MOUNT); 627 opt->name = strdup("nonosuid", M_MOUNT); 628 } 629 else if (strcmp(opt->name, "nosymfollow") == 0) 630 fsflags |= MNT_NOSYMFOLLOW; 631 else if (strcmp(opt->name, "symfollow") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("nonosymfollow", M_MOUNT); 634 } 635 else if (strcmp(opt->name, "noro") == 0) 636 fsflags &= ~MNT_RDONLY; 637 else if (strcmp(opt->name, "rw") == 0) 638 fsflags &= ~MNT_RDONLY; 639 else if (strcmp(opt->name, "ro") == 0) 640 fsflags |= MNT_RDONLY; 641 else if (strcmp(opt->name, "rdonly") == 0) { 642 free(opt->name, M_MOUNT); 643 opt->name = strdup("ro", M_MOUNT); 644 fsflags |= MNT_RDONLY; 645 } 646 else if (strcmp(opt->name, "suiddir") == 0) 647 fsflags |= MNT_SUIDDIR; 648 else if (strcmp(opt->name, "sync") == 0) 649 fsflags |= MNT_SYNCHRONOUS; 650 else if (strcmp(opt->name, "union") == 0) 651 fsflags |= MNT_UNION; 652 else if (strcmp(opt->name, "automounted") == 0) { 653 fsflags |= MNT_AUTOMOUNTED; 654 vfs_freeopt(optlist, opt); 655 } 656 } 657 658 /* 659 * Be ultra-paranoid about making sure the type and fspath 660 * variables will fit in our mp buffers, including the 661 * terminating NUL. 662 */ 663 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 664 error = ENAMETOOLONG; 665 goto bail; 666 } 667 668 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 669 bail: 670 /* copyout the errmsg */ 671 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 672 && errmsg_len > 0 && errmsg != NULL) { 673 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 674 bcopy(errmsg, 675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 677 } else { 678 copyout(errmsg, 679 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 680 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 681 } 682 } 683 684 if (optlist != NULL) 685 vfs_freeopts(optlist); 686 return (error); 687 } 688 689 /* 690 * Old mount API. 691 */ 692 #ifndef _SYS_SYSPROTO_H_ 693 struct mount_args { 694 char *type; 695 char *path; 696 int flags; 697 caddr_t data; 698 }; 699 #endif 700 /* ARGSUSED */ 701 int 702 sys_mount(td, uap) 703 struct thread *td; 704 struct mount_args /* { 705 char *type; 706 char *path; 707 int flags; 708 caddr_t data; 709 } */ *uap; 710 { 711 char *fstype; 712 struct vfsconf *vfsp = NULL; 713 struct mntarg *ma = NULL; 714 uint64_t flags; 715 int error; 716 717 /* 718 * Mount flags are now 64-bits. On 32-bit architectures only 719 * 32-bits are passed in, but from here on everything handles 720 * 64-bit flags correctly. 721 */ 722 flags = uap->flags; 723 724 AUDIT_ARG_FFLAGS(flags); 725 726 /* 727 * Filter out MNT_ROOTFS. We do not want clients of mount() in 728 * userspace to set this flag, but we must filter it out if we want 729 * MNT_UPDATE on the root file system to work. 730 * MNT_ROOTFS should only be set by the kernel when mounting its 731 * root file system. 732 */ 733 flags &= ~MNT_ROOTFS; 734 735 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 736 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 737 if (error) { 738 free(fstype, M_TEMP); 739 return (error); 740 } 741 742 AUDIT_ARG_TEXT(fstype); 743 vfsp = vfs_byname_kld(fstype, td, &error); 744 free(fstype, M_TEMP); 745 if (vfsp == NULL) 746 return (ENOENT); 747 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 748 return (EOPNOTSUPP); 749 750 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 751 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 752 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 753 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 754 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 755 756 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 757 return (error); 758 } 759 760 /* 761 * vfs_domount_first(): first file system mount (not update) 762 */ 763 static int 764 vfs_domount_first( 765 struct thread *td, /* Calling thread. */ 766 struct vfsconf *vfsp, /* File system type. */ 767 char *fspath, /* Mount path. */ 768 struct vnode *vp, /* Vnode to be covered. */ 769 uint64_t fsflags, /* Flags common to all filesystems. */ 770 struct vfsoptlist **optlist /* Options local to the filesystem. */ 771 ) 772 { 773 struct vattr va; 774 struct mount *mp; 775 struct vnode *newdp; 776 int error; 777 778 ASSERT_VOP_ELOCKED(vp, __func__); 779 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 780 781 /* 782 * If the user is not root, ensure that they own the directory 783 * onto which we are attempting to mount. 784 */ 785 error = VOP_GETATTR(vp, &va, td->td_ucred); 786 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 787 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 788 if (error == 0) 789 error = vinvalbuf(vp, V_SAVE, 0, 0); 790 if (error == 0 && vp->v_type != VDIR) 791 error = ENOTDIR; 792 if (error == 0) { 793 VI_LOCK(vp); 794 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 795 vp->v_iflag |= VI_MOUNT; 796 else 797 error = EBUSY; 798 VI_UNLOCK(vp); 799 } 800 if (error != 0) { 801 vput(vp); 802 return (error); 803 } 804 VOP_UNLOCK(vp, 0); 805 806 /* Allocate and initialize the filesystem. */ 807 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 808 /* XXXMAC: pass to vfs_mount_alloc? */ 809 mp->mnt_optnew = *optlist; 810 /* Set the mount level flags. */ 811 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 812 813 /* 814 * Mount the filesystem. 815 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 816 * get. No freeing of cn_pnbuf. 817 */ 818 error = VFS_MOUNT(mp); 819 if (error != 0) { 820 vfs_unbusy(mp); 821 vfs_mount_destroy(mp); 822 VI_LOCK(vp); 823 vp->v_iflag &= ~VI_MOUNT; 824 VI_UNLOCK(vp); 825 vrele(vp); 826 return (error); 827 } 828 829 if (mp->mnt_opt != NULL) 830 vfs_freeopts(mp->mnt_opt); 831 mp->mnt_opt = mp->mnt_optnew; 832 *optlist = NULL; 833 (void)VFS_STATFS(mp, &mp->mnt_stat); 834 835 /* 836 * Prevent external consumers of mount options from reading mnt_optnew. 837 */ 838 mp->mnt_optnew = NULL; 839 840 MNT_ILOCK(mp); 841 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 842 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 843 mp->mnt_kern_flag |= MNTK_ASYNC; 844 else 845 mp->mnt_kern_flag &= ~MNTK_ASYNC; 846 MNT_IUNLOCK(mp); 847 848 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 849 cache_purge(vp); 850 VI_LOCK(vp); 851 vp->v_iflag &= ~VI_MOUNT; 852 VI_UNLOCK(vp); 853 vp->v_mountedhere = mp; 854 /* Place the new filesystem at the end of the mount list. */ 855 mtx_lock(&mountlist_mtx); 856 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 857 mtx_unlock(&mountlist_mtx); 858 vfs_event_signal(NULL, VQ_MOUNT, 0); 859 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 860 panic("mount: lost mount"); 861 VOP_UNLOCK(vp, 0); 862 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td); 863 VOP_UNLOCK(newdp, 0); 864 mountcheckdirs(vp, newdp); 865 vrele(newdp); 866 if ((mp->mnt_flag & MNT_RDONLY) == 0) 867 vfs_allocate_syncvnode(mp); 868 vfs_unbusy(mp); 869 return (0); 870 } 871 872 /* 873 * vfs_domount_update(): update of mounted file system 874 */ 875 static int 876 vfs_domount_update( 877 struct thread *td, /* Calling thread. */ 878 struct vnode *vp, /* Mount point vnode. */ 879 uint64_t fsflags, /* Flags common to all filesystems. */ 880 struct vfsoptlist **optlist /* Options local to the filesystem. */ 881 ) 882 { 883 struct export_args export; 884 void *bufp; 885 struct mount *mp; 886 int error, export_error, len; 887 uint64_t flag; 888 889 ASSERT_VOP_ELOCKED(vp, __func__); 890 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 891 mp = vp->v_mount; 892 893 if ((vp->v_vflag & VV_ROOT) == 0) { 894 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 895 == 0) 896 error = EXDEV; 897 else 898 error = EINVAL; 899 vput(vp); 900 return (error); 901 } 902 903 /* 904 * We only allow the filesystem to be reloaded if it 905 * is currently mounted read-only. 906 */ 907 flag = mp->mnt_flag; 908 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 909 vput(vp); 910 return (EOPNOTSUPP); /* Needs translation */ 911 } 912 /* 913 * Only privileged root, or (if MNT_USER is set) the user that 914 * did the original mount is permitted to update it. 915 */ 916 error = vfs_suser(mp, td); 917 if (error != 0) { 918 vput(vp); 919 return (error); 920 } 921 if (vfs_busy(mp, MBF_NOWAIT)) { 922 vput(vp); 923 return (EBUSY); 924 } 925 VI_LOCK(vp); 926 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 927 VI_UNLOCK(vp); 928 vfs_unbusy(mp); 929 vput(vp); 930 return (EBUSY); 931 } 932 vp->v_iflag |= VI_MOUNT; 933 VI_UNLOCK(vp); 934 VOP_UNLOCK(vp, 0); 935 936 MNT_ILOCK(mp); 937 mp->mnt_flag &= ~MNT_UPDATEMASK; 938 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 939 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 940 if ((mp->mnt_flag & MNT_ASYNC) == 0) 941 mp->mnt_kern_flag &= ~MNTK_ASYNC; 942 MNT_IUNLOCK(mp); 943 mp->mnt_optnew = *optlist; 944 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 945 946 /* 947 * Mount the filesystem. 948 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 949 * get. No freeing of cn_pnbuf. 950 */ 951 error = VFS_MOUNT(mp); 952 953 export_error = 0; 954 /* Process the export option. */ 955 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 956 &len) == 0) { 957 /* Assume that there is only 1 ABI for each length. */ 958 switch (len) { 959 case (sizeof(struct oexport_args)): 960 bzero(&export, sizeof(export)); 961 /* FALLTHROUGH */ 962 case (sizeof(export)): 963 bcopy(bufp, &export, len); 964 export_error = vfs_export(mp, &export); 965 break; 966 default: 967 export_error = EINVAL; 968 break; 969 } 970 } 971 972 MNT_ILOCK(mp); 973 if (error == 0) { 974 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 975 MNT_SNAPSHOT); 976 } else { 977 /* 978 * If we fail, restore old mount flags. MNT_QUOTA is special, 979 * because it is not part of MNT_UPDATEMASK, but it could have 980 * changed in the meantime if quotactl(2) was called. 981 * All in all we want current value of MNT_QUOTA, not the old 982 * one. 983 */ 984 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 985 } 986 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 987 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 988 mp->mnt_kern_flag |= MNTK_ASYNC; 989 else 990 mp->mnt_kern_flag &= ~MNTK_ASYNC; 991 MNT_IUNLOCK(mp); 992 993 if (error != 0) 994 goto end; 995 996 if (mp->mnt_opt != NULL) 997 vfs_freeopts(mp->mnt_opt); 998 mp->mnt_opt = mp->mnt_optnew; 999 *optlist = NULL; 1000 (void)VFS_STATFS(mp, &mp->mnt_stat); 1001 /* 1002 * Prevent external consumers of mount options from reading 1003 * mnt_optnew. 1004 */ 1005 mp->mnt_optnew = NULL; 1006 1007 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1008 vfs_allocate_syncvnode(mp); 1009 else 1010 vfs_deallocate_syncvnode(mp); 1011 end: 1012 vfs_unbusy(mp); 1013 VI_LOCK(vp); 1014 vp->v_iflag &= ~VI_MOUNT; 1015 VI_UNLOCK(vp); 1016 vrele(vp); 1017 return (error != 0 ? error : export_error); 1018 } 1019 1020 /* 1021 * vfs_domount(): actually attempt a filesystem mount. 1022 */ 1023 static int 1024 vfs_domount( 1025 struct thread *td, /* Calling thread. */ 1026 const char *fstype, /* Filesystem type. */ 1027 char *fspath, /* Mount path. */ 1028 uint64_t fsflags, /* Flags common to all filesystems. */ 1029 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1030 ) 1031 { 1032 struct vfsconf *vfsp; 1033 struct nameidata nd; 1034 struct vnode *vp; 1035 char *pathbuf; 1036 int error; 1037 1038 /* 1039 * Be ultra-paranoid about making sure the type and fspath 1040 * variables will fit in our mp buffers, including the 1041 * terminating NUL. 1042 */ 1043 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1044 return (ENAMETOOLONG); 1045 1046 if (jailed(td->td_ucred) || usermount == 0) { 1047 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1048 return (error); 1049 } 1050 1051 /* 1052 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1053 */ 1054 if (fsflags & MNT_EXPORTED) { 1055 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1056 if (error) 1057 return (error); 1058 } 1059 if (fsflags & MNT_SUIDDIR) { 1060 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1061 if (error) 1062 return (error); 1063 } 1064 /* 1065 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1066 */ 1067 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1068 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1069 fsflags |= MNT_NOSUID | MNT_USER; 1070 } 1071 1072 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1073 vfsp = NULL; 1074 if ((fsflags & MNT_UPDATE) == 0) { 1075 /* Don't try to load KLDs if we're mounting the root. */ 1076 if (fsflags & MNT_ROOTFS) 1077 vfsp = vfs_byname(fstype); 1078 else 1079 vfsp = vfs_byname_kld(fstype, td, &error); 1080 if (vfsp == NULL) 1081 return (ENODEV); 1082 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1083 return (EPERM); 1084 } 1085 1086 /* 1087 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1088 */ 1089 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1090 UIO_SYSSPACE, fspath, td); 1091 error = namei(&nd); 1092 if (error != 0) 1093 return (error); 1094 NDFREE(&nd, NDF_ONLY_PNBUF); 1095 vp = nd.ni_vp; 1096 if ((fsflags & MNT_UPDATE) == 0) { 1097 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1098 strcpy(pathbuf, fspath); 1099 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1100 /* debug.disablefullpath == 1 results in ENODEV */ 1101 if (error == 0 || error == ENODEV) { 1102 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1103 fsflags, optlist); 1104 } 1105 free(pathbuf, M_TEMP); 1106 } else 1107 error = vfs_domount_update(td, vp, fsflags, optlist); 1108 1109 return (error); 1110 } 1111 1112 /* 1113 * Unmount a filesystem. 1114 * 1115 * Note: unmount takes a path to the vnode mounted on as argument, not 1116 * special file (as before). 1117 */ 1118 #ifndef _SYS_SYSPROTO_H_ 1119 struct unmount_args { 1120 char *path; 1121 int flags; 1122 }; 1123 #endif 1124 /* ARGSUSED */ 1125 int 1126 sys_unmount(struct thread *td, struct unmount_args *uap) 1127 { 1128 struct nameidata nd; 1129 struct mount *mp; 1130 char *pathbuf; 1131 int error, id0, id1; 1132 1133 AUDIT_ARG_VALUE(uap->flags); 1134 if (jailed(td->td_ucred) || usermount == 0) { 1135 error = priv_check(td, PRIV_VFS_UNMOUNT); 1136 if (error) 1137 return (error); 1138 } 1139 1140 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1141 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1142 if (error) { 1143 free(pathbuf, M_TEMP); 1144 return (error); 1145 } 1146 if (uap->flags & MNT_BYFSID) { 1147 AUDIT_ARG_TEXT(pathbuf); 1148 /* Decode the filesystem ID. */ 1149 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1150 free(pathbuf, M_TEMP); 1151 return (EINVAL); 1152 } 1153 1154 mtx_lock(&mountlist_mtx); 1155 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1156 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1157 mp->mnt_stat.f_fsid.val[1] == id1) { 1158 vfs_ref(mp); 1159 break; 1160 } 1161 } 1162 mtx_unlock(&mountlist_mtx); 1163 } else { 1164 /* 1165 * Try to find global path for path argument. 1166 */ 1167 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1168 UIO_SYSSPACE, pathbuf, td); 1169 if (namei(&nd) == 0) { 1170 NDFREE(&nd, NDF_ONLY_PNBUF); 1171 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1172 MNAMELEN); 1173 if (error == 0 || error == ENODEV) 1174 vput(nd.ni_vp); 1175 } 1176 mtx_lock(&mountlist_mtx); 1177 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1178 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1179 vfs_ref(mp); 1180 break; 1181 } 1182 } 1183 mtx_unlock(&mountlist_mtx); 1184 } 1185 free(pathbuf, M_TEMP); 1186 if (mp == NULL) { 1187 /* 1188 * Previously we returned ENOENT for a nonexistent path and 1189 * EINVAL for a non-mountpoint. We cannot tell these apart 1190 * now, so in the !MNT_BYFSID case return the more likely 1191 * EINVAL for compatibility. 1192 */ 1193 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1194 } 1195 1196 /* 1197 * Don't allow unmounting the root filesystem. 1198 */ 1199 if (mp->mnt_flag & MNT_ROOTFS) { 1200 vfs_rel(mp); 1201 return (EINVAL); 1202 } 1203 error = dounmount(mp, uap->flags, td); 1204 return (error); 1205 } 1206 1207 /* 1208 * Return error if any of the vnodes, ignoring the root vnode 1209 * and the syncer vnode, have non-zero usecount. 1210 * 1211 * This function is purely advisory - it can return false positives 1212 * and negatives. 1213 */ 1214 static int 1215 vfs_check_usecounts(struct mount *mp) 1216 { 1217 struct vnode *vp, *mvp; 1218 1219 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1220 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1221 vp->v_usecount != 0) { 1222 VI_UNLOCK(vp); 1223 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1224 return (EBUSY); 1225 } 1226 VI_UNLOCK(vp); 1227 } 1228 1229 return (0); 1230 } 1231 1232 /* 1233 * Do the actual filesystem unmount. 1234 */ 1235 int 1236 dounmount(struct mount *mp, int flags, struct thread *td) 1237 { 1238 struct vnode *coveredvp, *fsrootvp; 1239 int error; 1240 uint64_t async_flag; 1241 int mnt_gen_r; 1242 1243 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1244 mnt_gen_r = mp->mnt_gen; 1245 VI_LOCK(coveredvp); 1246 vholdl(coveredvp); 1247 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1248 /* 1249 * Check for mp being unmounted while waiting for the 1250 * covered vnode lock. 1251 */ 1252 if (coveredvp->v_mountedhere != mp || 1253 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1254 VOP_UNLOCK(coveredvp, 0); 1255 vdrop(coveredvp); 1256 vfs_rel(mp); 1257 return (EBUSY); 1258 } 1259 } 1260 1261 /* 1262 * Only privileged root, or (if MNT_USER is set) the user that did the 1263 * original mount is permitted to unmount this filesystem. 1264 */ 1265 error = vfs_suser(mp, td); 1266 if (error != 0) { 1267 if (coveredvp != NULL) { 1268 VOP_UNLOCK(coveredvp, 0); 1269 vdrop(coveredvp); 1270 } 1271 vfs_rel(mp); 1272 return (error); 1273 } 1274 1275 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1276 MNT_ILOCK(mp); 1277 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1278 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1279 MNT_IUNLOCK(mp); 1280 if (coveredvp != NULL) { 1281 VOP_UNLOCK(coveredvp, 0); 1282 vdrop(coveredvp); 1283 } 1284 vn_finished_write(mp); 1285 return (EBUSY); 1286 } 1287 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1288 if (flags & MNT_NONBUSY) { 1289 MNT_IUNLOCK(mp); 1290 error = vfs_check_usecounts(mp); 1291 MNT_ILOCK(mp); 1292 if (error != 0) { 1293 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ); 1294 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1295 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1296 wakeup(mp); 1297 } 1298 MNT_IUNLOCK(mp); 1299 if (coveredvp != NULL) { 1300 VOP_UNLOCK(coveredvp, 0); 1301 vdrop(coveredvp); 1302 } 1303 vn_finished_write(mp); 1304 return (error); 1305 } 1306 } 1307 /* Allow filesystems to detect that a forced unmount is in progress. */ 1308 if (flags & MNT_FORCE) { 1309 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1310 MNT_IUNLOCK(mp); 1311 /* 1312 * Must be done after setting MNTK_UNMOUNTF and before 1313 * waiting for mnt_lockref to become 0. 1314 */ 1315 VFS_PURGE(mp); 1316 MNT_ILOCK(mp); 1317 } 1318 error = 0; 1319 if (mp->mnt_lockref) { 1320 mp->mnt_kern_flag |= MNTK_DRAINING; 1321 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1322 "mount drain", 0); 1323 } 1324 MNT_IUNLOCK(mp); 1325 KASSERT(mp->mnt_lockref == 0, 1326 ("%s: invalid lock refcount in the drain path @ %s:%d", 1327 __func__, __FILE__, __LINE__)); 1328 KASSERT(error == 0, 1329 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1330 __func__, __FILE__, __LINE__)); 1331 1332 if (mp->mnt_flag & MNT_EXPUBLIC) 1333 vfs_setpublicfs(NULL, NULL, NULL); 1334 1335 /* 1336 * From now, we can claim that the use reference on the 1337 * coveredvp is ours, and the ref can be released only by 1338 * successfull unmount by us, or left for later unmount 1339 * attempt. The previously acquired hold reference is no 1340 * longer needed to protect the vnode from reuse. 1341 */ 1342 if (coveredvp != NULL) 1343 vdrop(coveredvp); 1344 1345 vfs_msync(mp, MNT_WAIT); 1346 MNT_ILOCK(mp); 1347 async_flag = mp->mnt_flag & MNT_ASYNC; 1348 mp->mnt_flag &= ~MNT_ASYNC; 1349 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1350 MNT_IUNLOCK(mp); 1351 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1352 vfs_deallocate_syncvnode(mp); 1353 /* 1354 * For forced unmounts, move process cdir/rdir refs on the fs root 1355 * vnode to the covered vnode. For non-forced unmounts we want 1356 * such references to cause an EBUSY error. 1357 */ 1358 if ((flags & MNT_FORCE) && 1359 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1360 if (mp->mnt_vnodecovered != NULL && 1361 (mp->mnt_flag & MNT_IGNORE) == 0) 1362 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1363 if (fsrootvp == rootvnode) { 1364 vrele(rootvnode); 1365 rootvnode = NULL; 1366 } 1367 vput(fsrootvp); 1368 } 1369 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1370 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1371 error = VFS_UNMOUNT(mp, flags); 1372 vn_finished_write(mp); 1373 /* 1374 * If we failed to flush the dirty blocks for this mount point, 1375 * undo all the cdir/rdir and rootvnode changes we made above. 1376 * Unless we failed to do so because the device is reporting that 1377 * it doesn't exist anymore. 1378 */ 1379 if (error && error != ENXIO) { 1380 if ((flags & MNT_FORCE) && 1381 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1382 if (mp->mnt_vnodecovered != NULL && 1383 (mp->mnt_flag & MNT_IGNORE) == 0) 1384 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1385 if (rootvnode == NULL) { 1386 rootvnode = fsrootvp; 1387 vref(rootvnode); 1388 } 1389 vput(fsrootvp); 1390 } 1391 MNT_ILOCK(mp); 1392 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1393 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1394 MNT_IUNLOCK(mp); 1395 vfs_allocate_syncvnode(mp); 1396 MNT_ILOCK(mp); 1397 } 1398 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1399 mp->mnt_flag |= async_flag; 1400 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1401 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1402 mp->mnt_kern_flag |= MNTK_ASYNC; 1403 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1404 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1405 wakeup(mp); 1406 } 1407 MNT_IUNLOCK(mp); 1408 if (coveredvp) 1409 VOP_UNLOCK(coveredvp, 0); 1410 return (error); 1411 } 1412 mtx_lock(&mountlist_mtx); 1413 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1414 mtx_unlock(&mountlist_mtx); 1415 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td); 1416 if (coveredvp != NULL) { 1417 coveredvp->v_mountedhere = NULL; 1418 vput(coveredvp); 1419 } 1420 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1421 if (mp == rootdevmp) 1422 rootdevmp = NULL; 1423 vfs_mount_destroy(mp); 1424 return (0); 1425 } 1426 1427 /* 1428 * Report errors during filesystem mounting. 1429 */ 1430 void 1431 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1432 { 1433 struct vfsoptlist *moptlist = mp->mnt_optnew; 1434 va_list ap; 1435 int error, len; 1436 char *errmsg; 1437 1438 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1439 if (error || errmsg == NULL || len <= 0) 1440 return; 1441 1442 va_start(ap, fmt); 1443 vsnprintf(errmsg, (size_t)len, fmt, ap); 1444 va_end(ap); 1445 } 1446 1447 void 1448 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1449 { 1450 va_list ap; 1451 int error, len; 1452 char *errmsg; 1453 1454 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1455 if (error || errmsg == NULL || len <= 0) 1456 return; 1457 1458 va_start(ap, fmt); 1459 vsnprintf(errmsg, (size_t)len, fmt, ap); 1460 va_end(ap); 1461 } 1462 1463 /* 1464 * --------------------------------------------------------------------- 1465 * Functions for querying mount options/arguments from filesystems. 1466 */ 1467 1468 /* 1469 * Check that no unknown options are given 1470 */ 1471 int 1472 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1473 { 1474 struct vfsopt *opt; 1475 char errmsg[255]; 1476 const char **t, *p, *q; 1477 int ret = 0; 1478 1479 TAILQ_FOREACH(opt, opts, link) { 1480 p = opt->name; 1481 q = NULL; 1482 if (p[0] == 'n' && p[1] == 'o') 1483 q = p + 2; 1484 for(t = global_opts; *t != NULL; t++) { 1485 if (strcmp(*t, p) == 0) 1486 break; 1487 if (q != NULL) { 1488 if (strcmp(*t, q) == 0) 1489 break; 1490 } 1491 } 1492 if (*t != NULL) 1493 continue; 1494 for(t = legal; *t != NULL; t++) { 1495 if (strcmp(*t, p) == 0) 1496 break; 1497 if (q != NULL) { 1498 if (strcmp(*t, q) == 0) 1499 break; 1500 } 1501 } 1502 if (*t != NULL) 1503 continue; 1504 snprintf(errmsg, sizeof(errmsg), 1505 "mount option <%s> is unknown", p); 1506 ret = EINVAL; 1507 } 1508 if (ret != 0) { 1509 TAILQ_FOREACH(opt, opts, link) { 1510 if (strcmp(opt->name, "errmsg") == 0) { 1511 strncpy((char *)opt->value, errmsg, opt->len); 1512 break; 1513 } 1514 } 1515 if (opt == NULL) 1516 printf("%s\n", errmsg); 1517 } 1518 return (ret); 1519 } 1520 1521 /* 1522 * Get a mount option by its name. 1523 * 1524 * Return 0 if the option was found, ENOENT otherwise. 1525 * If len is non-NULL it will be filled with the length 1526 * of the option. If buf is non-NULL, it will be filled 1527 * with the address of the option. 1528 */ 1529 int 1530 vfs_getopt(opts, name, buf, len) 1531 struct vfsoptlist *opts; 1532 const char *name; 1533 void **buf; 1534 int *len; 1535 { 1536 struct vfsopt *opt; 1537 1538 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1539 1540 TAILQ_FOREACH(opt, opts, link) { 1541 if (strcmp(name, opt->name) == 0) { 1542 opt->seen = 1; 1543 if (len != NULL) 1544 *len = opt->len; 1545 if (buf != NULL) 1546 *buf = opt->value; 1547 return (0); 1548 } 1549 } 1550 return (ENOENT); 1551 } 1552 1553 int 1554 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1555 { 1556 struct vfsopt *opt; 1557 1558 if (opts == NULL) 1559 return (-1); 1560 1561 TAILQ_FOREACH(opt, opts, link) { 1562 if (strcmp(name, opt->name) == 0) { 1563 opt->seen = 1; 1564 return (opt->pos); 1565 } 1566 } 1567 return (-1); 1568 } 1569 1570 int 1571 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1572 { 1573 char *opt_value, *vtp; 1574 quad_t iv; 1575 int error, opt_len; 1576 1577 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1578 if (error != 0) 1579 return (error); 1580 if (opt_len == 0 || opt_value == NULL) 1581 return (EINVAL); 1582 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1583 return (EINVAL); 1584 iv = strtoq(opt_value, &vtp, 0); 1585 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1586 return (EINVAL); 1587 if (iv < 0) 1588 return (EINVAL); 1589 switch (vtp[0]) { 1590 case 't': 1591 case 'T': 1592 iv *= 1024; 1593 case 'g': 1594 case 'G': 1595 iv *= 1024; 1596 case 'm': 1597 case 'M': 1598 iv *= 1024; 1599 case 'k': 1600 case 'K': 1601 iv *= 1024; 1602 case '\0': 1603 break; 1604 default: 1605 return (EINVAL); 1606 } 1607 *value = iv; 1608 1609 return (0); 1610 } 1611 1612 char * 1613 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1614 { 1615 struct vfsopt *opt; 1616 1617 *error = 0; 1618 TAILQ_FOREACH(opt, opts, link) { 1619 if (strcmp(name, opt->name) != 0) 1620 continue; 1621 opt->seen = 1; 1622 if (opt->len == 0 || 1623 ((char *)opt->value)[opt->len - 1] != '\0') { 1624 *error = EINVAL; 1625 return (NULL); 1626 } 1627 return (opt->value); 1628 } 1629 *error = ENOENT; 1630 return (NULL); 1631 } 1632 1633 int 1634 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1635 uint64_t val) 1636 { 1637 struct vfsopt *opt; 1638 1639 TAILQ_FOREACH(opt, opts, link) { 1640 if (strcmp(name, opt->name) == 0) { 1641 opt->seen = 1; 1642 if (w != NULL) 1643 *w |= val; 1644 return (1); 1645 } 1646 } 1647 if (w != NULL) 1648 *w &= ~val; 1649 return (0); 1650 } 1651 1652 int 1653 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1654 { 1655 va_list ap; 1656 struct vfsopt *opt; 1657 int ret; 1658 1659 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1660 1661 TAILQ_FOREACH(opt, opts, link) { 1662 if (strcmp(name, opt->name) != 0) 1663 continue; 1664 opt->seen = 1; 1665 if (opt->len == 0 || opt->value == NULL) 1666 return (0); 1667 if (((char *)opt->value)[opt->len - 1] != '\0') 1668 return (0); 1669 va_start(ap, fmt); 1670 ret = vsscanf(opt->value, fmt, ap); 1671 va_end(ap); 1672 return (ret); 1673 } 1674 return (0); 1675 } 1676 1677 int 1678 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1679 { 1680 struct vfsopt *opt; 1681 1682 TAILQ_FOREACH(opt, opts, link) { 1683 if (strcmp(name, opt->name) != 0) 1684 continue; 1685 opt->seen = 1; 1686 if (opt->value == NULL) 1687 opt->len = len; 1688 else { 1689 if (opt->len != len) 1690 return (EINVAL); 1691 bcopy(value, opt->value, len); 1692 } 1693 return (0); 1694 } 1695 return (ENOENT); 1696 } 1697 1698 int 1699 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1700 { 1701 struct vfsopt *opt; 1702 1703 TAILQ_FOREACH(opt, opts, link) { 1704 if (strcmp(name, opt->name) != 0) 1705 continue; 1706 opt->seen = 1; 1707 if (opt->value == NULL) 1708 opt->len = len; 1709 else { 1710 if (opt->len < len) 1711 return (EINVAL); 1712 opt->len = len; 1713 bcopy(value, opt->value, len); 1714 } 1715 return (0); 1716 } 1717 return (ENOENT); 1718 } 1719 1720 int 1721 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1722 { 1723 struct vfsopt *opt; 1724 1725 TAILQ_FOREACH(opt, opts, link) { 1726 if (strcmp(name, opt->name) != 0) 1727 continue; 1728 opt->seen = 1; 1729 if (opt->value == NULL) 1730 opt->len = strlen(value) + 1; 1731 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1732 return (EINVAL); 1733 return (0); 1734 } 1735 return (ENOENT); 1736 } 1737 1738 /* 1739 * Find and copy a mount option. 1740 * 1741 * The size of the buffer has to be specified 1742 * in len, if it is not the same length as the 1743 * mount option, EINVAL is returned. 1744 * Returns ENOENT if the option is not found. 1745 */ 1746 int 1747 vfs_copyopt(opts, name, dest, len) 1748 struct vfsoptlist *opts; 1749 const char *name; 1750 void *dest; 1751 int len; 1752 { 1753 struct vfsopt *opt; 1754 1755 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1756 1757 TAILQ_FOREACH(opt, opts, link) { 1758 if (strcmp(name, opt->name) == 0) { 1759 opt->seen = 1; 1760 if (len != opt->len) 1761 return (EINVAL); 1762 bcopy(opt->value, dest, opt->len); 1763 return (0); 1764 } 1765 } 1766 return (ENOENT); 1767 } 1768 1769 int 1770 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1771 { 1772 int error; 1773 1774 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1775 if (sbp != &mp->mnt_stat) 1776 *sbp = mp->mnt_stat; 1777 return (error); 1778 } 1779 1780 void 1781 vfs_mountedfrom(struct mount *mp, const char *from) 1782 { 1783 1784 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1785 strlcpy(mp->mnt_stat.f_mntfromname, from, 1786 sizeof mp->mnt_stat.f_mntfromname); 1787 } 1788 1789 /* 1790 * --------------------------------------------------------------------- 1791 * This is the api for building mount args and mounting filesystems from 1792 * inside the kernel. 1793 * 1794 * The API works by accumulation of individual args. First error is 1795 * latched. 1796 * 1797 * XXX: should be documented in new manpage kernel_mount(9) 1798 */ 1799 1800 /* A memory allocation which must be freed when we are done */ 1801 struct mntaarg { 1802 SLIST_ENTRY(mntaarg) next; 1803 }; 1804 1805 /* The header for the mount arguments */ 1806 struct mntarg { 1807 struct iovec *v; 1808 int len; 1809 int error; 1810 SLIST_HEAD(, mntaarg) list; 1811 }; 1812 1813 /* 1814 * Add a boolean argument. 1815 * 1816 * flag is the boolean value. 1817 * name must start with "no". 1818 */ 1819 struct mntarg * 1820 mount_argb(struct mntarg *ma, int flag, const char *name) 1821 { 1822 1823 KASSERT(name[0] == 'n' && name[1] == 'o', 1824 ("mount_argb(...,%s): name must start with 'no'", name)); 1825 1826 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1827 } 1828 1829 /* 1830 * Add an argument printf style 1831 */ 1832 struct mntarg * 1833 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1834 { 1835 va_list ap; 1836 struct mntaarg *maa; 1837 struct sbuf *sb; 1838 int len; 1839 1840 if (ma == NULL) { 1841 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1842 SLIST_INIT(&ma->list); 1843 } 1844 if (ma->error) 1845 return (ma); 1846 1847 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1848 M_MOUNT, M_WAITOK); 1849 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1850 ma->v[ma->len].iov_len = strlen(name) + 1; 1851 ma->len++; 1852 1853 sb = sbuf_new_auto(); 1854 va_start(ap, fmt); 1855 sbuf_vprintf(sb, fmt, ap); 1856 va_end(ap); 1857 sbuf_finish(sb); 1858 len = sbuf_len(sb) + 1; 1859 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1860 SLIST_INSERT_HEAD(&ma->list, maa, next); 1861 bcopy(sbuf_data(sb), maa + 1, len); 1862 sbuf_delete(sb); 1863 1864 ma->v[ma->len].iov_base = maa + 1; 1865 ma->v[ma->len].iov_len = len; 1866 ma->len++; 1867 1868 return (ma); 1869 } 1870 1871 /* 1872 * Add an argument which is a userland string. 1873 */ 1874 struct mntarg * 1875 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1876 { 1877 struct mntaarg *maa; 1878 char *tbuf; 1879 1880 if (val == NULL) 1881 return (ma); 1882 if (ma == NULL) { 1883 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1884 SLIST_INIT(&ma->list); 1885 } 1886 if (ma->error) 1887 return (ma); 1888 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1889 SLIST_INSERT_HEAD(&ma->list, maa, next); 1890 tbuf = (void *)(maa + 1); 1891 ma->error = copyinstr(val, tbuf, len, NULL); 1892 return (mount_arg(ma, name, tbuf, -1)); 1893 } 1894 1895 /* 1896 * Plain argument. 1897 * 1898 * If length is -1, treat value as a C string. 1899 */ 1900 struct mntarg * 1901 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1902 { 1903 1904 if (ma == NULL) { 1905 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1906 SLIST_INIT(&ma->list); 1907 } 1908 if (ma->error) 1909 return (ma); 1910 1911 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1912 M_MOUNT, M_WAITOK); 1913 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1914 ma->v[ma->len].iov_len = strlen(name) + 1; 1915 ma->len++; 1916 1917 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1918 if (len < 0) 1919 ma->v[ma->len].iov_len = strlen(val) + 1; 1920 else 1921 ma->v[ma->len].iov_len = len; 1922 ma->len++; 1923 return (ma); 1924 } 1925 1926 /* 1927 * Free a mntarg structure 1928 */ 1929 static void 1930 free_mntarg(struct mntarg *ma) 1931 { 1932 struct mntaarg *maa; 1933 1934 while (!SLIST_EMPTY(&ma->list)) { 1935 maa = SLIST_FIRST(&ma->list); 1936 SLIST_REMOVE_HEAD(&ma->list, next); 1937 free(maa, M_MOUNT); 1938 } 1939 free(ma->v, M_MOUNT); 1940 free(ma, M_MOUNT); 1941 } 1942 1943 /* 1944 * Mount a filesystem 1945 */ 1946 int 1947 kernel_mount(struct mntarg *ma, uint64_t flags) 1948 { 1949 struct uio auio; 1950 int error; 1951 1952 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1953 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1954 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1955 1956 auio.uio_iov = ma->v; 1957 auio.uio_iovcnt = ma->len; 1958 auio.uio_segflg = UIO_SYSSPACE; 1959 1960 error = ma->error; 1961 if (!error) 1962 error = vfs_donmount(curthread, flags, &auio); 1963 free_mntarg(ma); 1964 return (error); 1965 } 1966 1967 /* 1968 * A printflike function to mount a filesystem. 1969 */ 1970 int 1971 kernel_vmount(int flags, ...) 1972 { 1973 struct mntarg *ma = NULL; 1974 va_list ap; 1975 const char *cp; 1976 const void *vp; 1977 int error; 1978 1979 va_start(ap, flags); 1980 for (;;) { 1981 cp = va_arg(ap, const char *); 1982 if (cp == NULL) 1983 break; 1984 vp = va_arg(ap, const void *); 1985 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1986 } 1987 va_end(ap); 1988 1989 error = kernel_mount(ma, flags); 1990 return (error); 1991 } 1992 1993 void 1994 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1995 { 1996 1997 bcopy(oexp, exp, sizeof(*oexp)); 1998 exp->ex_numsecflavors = 0; 1999 } 2000