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 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure"); 83 static uma_zone_t mount_zone; 84 85 /* List of mounted filesystems. */ 86 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 87 88 /* For any iteration/modification of mountlist */ 89 struct mtx mountlist_mtx; 90 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 91 92 /* 93 * Global opts, taken by all filesystems 94 */ 95 static const char *global_opts[] = { 96 "errmsg", 97 "fstype", 98 "fspath", 99 "ro", 100 "rw", 101 "nosuid", 102 "noexec", 103 NULL 104 }; 105 106 static int 107 mount_init(void *mem, int size, int flags) 108 { 109 struct mount *mp; 110 111 mp = (struct mount *)mem; 112 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 113 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF); 114 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 115 return (0); 116 } 117 118 static void 119 mount_fini(void *mem, int size) 120 { 121 struct mount *mp; 122 123 mp = (struct mount *)mem; 124 lockdestroy(&mp->mnt_explock); 125 mtx_destroy(&mp->mnt_listmtx); 126 mtx_destroy(&mp->mnt_mtx); 127 } 128 129 static void 130 vfs_mount_init(void *dummy __unused) 131 { 132 133 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 134 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 135 } 136 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 137 138 /* 139 * --------------------------------------------------------------------- 140 * Functions for building and sanitizing the mount options 141 */ 142 143 /* Remove one mount option. */ 144 static void 145 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 146 { 147 148 TAILQ_REMOVE(opts, opt, link); 149 free(opt->name, M_MOUNT); 150 if (opt->value != NULL) 151 free(opt->value, M_MOUNT); 152 free(opt, M_MOUNT); 153 } 154 155 /* Release all resources related to the mount options. */ 156 void 157 vfs_freeopts(struct vfsoptlist *opts) 158 { 159 struct vfsopt *opt; 160 161 while (!TAILQ_EMPTY(opts)) { 162 opt = TAILQ_FIRST(opts); 163 vfs_freeopt(opts, opt); 164 } 165 free(opts, M_MOUNT); 166 } 167 168 void 169 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 170 { 171 struct vfsopt *opt, *temp; 172 173 if (opts == NULL) 174 return; 175 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 176 if (strcmp(opt->name, name) == 0) 177 vfs_freeopt(opts, opt); 178 } 179 } 180 181 static int 182 vfs_isopt_ro(const char *opt) 183 { 184 185 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 186 strcmp(opt, "norw") == 0) 187 return (1); 188 return (0); 189 } 190 191 static int 192 vfs_isopt_rw(const char *opt) 193 { 194 195 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 196 return (1); 197 return (0); 198 } 199 200 /* 201 * Check if options are equal (with or without the "no" prefix). 202 */ 203 static int 204 vfs_equalopts(const char *opt1, const char *opt2) 205 { 206 char *p; 207 208 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 209 if (strcmp(opt1, opt2) == 0) 210 return (1); 211 /* "noopt" vs. "opt" */ 212 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 213 return (1); 214 /* "opt" vs. "noopt" */ 215 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 216 return (1); 217 while ((p = strchr(opt1, '.')) != NULL && 218 !strncmp(opt1, opt2, ++p - opt1)) { 219 opt2 += p - opt1; 220 opt1 = p; 221 /* "foo.noopt" vs. "foo.opt" */ 222 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 223 return (1); 224 /* "foo.opt" vs. "foo.noopt" */ 225 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 226 return (1); 227 } 228 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 229 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 230 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 231 return (1); 232 return (0); 233 } 234 235 /* 236 * If a mount option is specified several times, 237 * (with or without the "no" prefix) only keep 238 * the last occurrence of it. 239 */ 240 static void 241 vfs_sanitizeopts(struct vfsoptlist *opts) 242 { 243 struct vfsopt *opt, *opt2, *tmp; 244 245 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 246 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 247 while (opt2 != NULL) { 248 if (vfs_equalopts(opt->name, opt2->name)) { 249 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 250 vfs_freeopt(opts, opt2); 251 opt2 = tmp; 252 } else { 253 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 254 } 255 } 256 } 257 } 258 259 /* 260 * Build a linked list of mount options from a struct uio. 261 */ 262 int 263 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 264 { 265 struct vfsoptlist *opts; 266 struct vfsopt *opt; 267 size_t memused, namelen, optlen; 268 unsigned int i, iovcnt; 269 int error; 270 271 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 272 TAILQ_INIT(opts); 273 memused = 0; 274 iovcnt = auio->uio_iovcnt; 275 for (i = 0; i < iovcnt; i += 2) { 276 namelen = auio->uio_iov[i].iov_len; 277 optlen = auio->uio_iov[i + 1].iov_len; 278 memused += sizeof(struct vfsopt) + optlen + namelen; 279 /* 280 * Avoid consuming too much memory, and attempts to overflow 281 * memused. 282 */ 283 if (memused > VFS_MOUNTARG_SIZE_MAX || 284 optlen > VFS_MOUNTARG_SIZE_MAX || 285 namelen > VFS_MOUNTARG_SIZE_MAX) { 286 error = EINVAL; 287 goto bad; 288 } 289 290 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 291 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 292 opt->value = NULL; 293 opt->len = 0; 294 opt->pos = i / 2; 295 opt->seen = 0; 296 297 /* 298 * Do this early, so jumps to "bad" will free the current 299 * option. 300 */ 301 TAILQ_INSERT_TAIL(opts, opt, link); 302 303 if (auio->uio_segflg == UIO_SYSSPACE) { 304 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 305 } else { 306 error = copyin(auio->uio_iov[i].iov_base, opt->name, 307 namelen); 308 if (error) 309 goto bad; 310 } 311 /* Ensure names are null-terminated strings. */ 312 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 313 error = EINVAL; 314 goto bad; 315 } 316 if (optlen != 0) { 317 opt->len = optlen; 318 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 319 if (auio->uio_segflg == UIO_SYSSPACE) { 320 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 321 optlen); 322 } else { 323 error = copyin(auio->uio_iov[i + 1].iov_base, 324 opt->value, optlen); 325 if (error) 326 goto bad; 327 } 328 } 329 } 330 vfs_sanitizeopts(opts); 331 *options = opts; 332 return (0); 333 bad: 334 vfs_freeopts(opts); 335 return (error); 336 } 337 338 /* 339 * Merge the old mount options with the new ones passed 340 * in the MNT_UPDATE case. 341 * 342 * XXX: This function will keep a "nofoo" option in the new 343 * options. E.g, if the option's canonical name is "foo", 344 * "nofoo" ends up in the mount point's active options. 345 */ 346 static void 347 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 348 { 349 struct vfsopt *opt, *new; 350 351 TAILQ_FOREACH(opt, oldopts, link) { 352 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 353 new->name = strdup(opt->name, M_MOUNT); 354 if (opt->len != 0) { 355 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 356 bcopy(opt->value, new->value, opt->len); 357 } else 358 new->value = NULL; 359 new->len = opt->len; 360 new->seen = opt->seen; 361 TAILQ_INSERT_HEAD(toopts, new, link); 362 } 363 vfs_sanitizeopts(toopts); 364 } 365 366 /* 367 * Mount a filesystem. 368 */ 369 #ifndef _SYS_SYSPROTO_H_ 370 struct nmount_args { 371 struct iovec *iovp; 372 unsigned int iovcnt; 373 int flags; 374 }; 375 #endif 376 int 377 sys_nmount(struct thread *td, struct nmount_args *uap) 378 { 379 struct uio *auio; 380 int error; 381 u_int iovcnt; 382 uint64_t flags; 383 384 /* 385 * Mount flags are now 64-bits. On 32-bit archtectures only 386 * 32-bits are passed in, but from here on everything handles 387 * 64-bit flags correctly. 388 */ 389 flags = uap->flags; 390 391 AUDIT_ARG_FFLAGS(flags); 392 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 393 uap->iovp, uap->iovcnt, flags); 394 395 /* 396 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 397 * userspace to set this flag, but we must filter it out if we want 398 * MNT_UPDATE on the root file system to work. 399 * MNT_ROOTFS should only be set by the kernel when mounting its 400 * root file system. 401 */ 402 flags &= ~MNT_ROOTFS; 403 404 iovcnt = uap->iovcnt; 405 /* 406 * Check that we have an even number of iovec's 407 * and that we have at least two options. 408 */ 409 if ((iovcnt & 1) || (iovcnt < 4)) { 410 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 411 uap->iovcnt); 412 return (EINVAL); 413 } 414 415 error = copyinuio(uap->iovp, iovcnt, &auio); 416 if (error) { 417 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 418 __func__, error); 419 return (error); 420 } 421 error = vfs_donmount(td, flags, auio); 422 423 free(auio, M_IOV); 424 return (error); 425 } 426 427 /* 428 * --------------------------------------------------------------------- 429 * Various utility functions 430 */ 431 432 void 433 vfs_ref(struct mount *mp) 434 { 435 436 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 437 MNT_ILOCK(mp); 438 MNT_REF(mp); 439 MNT_IUNLOCK(mp); 440 } 441 442 void 443 vfs_rel(struct mount *mp) 444 { 445 446 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 447 MNT_ILOCK(mp); 448 MNT_REL(mp); 449 MNT_IUNLOCK(mp); 450 } 451 452 /* 453 * Allocate and initialize the mount point struct. 454 */ 455 struct mount * 456 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 457 struct ucred *cred) 458 { 459 struct mount *mp; 460 461 mp = uma_zalloc(mount_zone, M_WAITOK); 462 bzero(&mp->mnt_startzero, 463 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 464 TAILQ_INIT(&mp->mnt_nvnodelist); 465 mp->mnt_nvnodelistsize = 0; 466 TAILQ_INIT(&mp->mnt_activevnodelist); 467 mp->mnt_activevnodelistsize = 0; 468 TAILQ_INIT(&mp->mnt_tmpfreevnodelist); 469 mp->mnt_tmpfreevnodelistsize = 0; 470 mp->mnt_ref = 0; 471 (void) vfs_busy(mp, MBF_NOWAIT); 472 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 473 mp->mnt_op = vfsp->vfc_vfsops; 474 mp->mnt_vfc = vfsp; 475 mp->mnt_stat.f_type = vfsp->vfc_typenum; 476 mp->mnt_gen++; 477 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 478 mp->mnt_vnodecovered = vp; 479 mp->mnt_cred = crdup(cred); 480 mp->mnt_stat.f_owner = cred->cr_uid; 481 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 482 mp->mnt_iosize_max = DFLTPHYS; 483 #ifdef MAC 484 mac_mount_init(mp); 485 mac_mount_create(cred, mp); 486 #endif 487 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 488 TAILQ_INIT(&mp->mnt_uppers); 489 return (mp); 490 } 491 492 /* 493 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 494 */ 495 void 496 vfs_mount_destroy(struct mount *mp) 497 { 498 499 MNT_ILOCK(mp); 500 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 501 if (mp->mnt_kern_flag & MNTK_MWAIT) { 502 mp->mnt_kern_flag &= ~MNTK_MWAIT; 503 wakeup(mp); 504 } 505 while (mp->mnt_ref) 506 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 507 KASSERT(mp->mnt_ref == 0, 508 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 509 __FILE__, __LINE__)); 510 if (mp->mnt_writeopcount != 0) 511 panic("vfs_mount_destroy: nonzero writeopcount"); 512 if (mp->mnt_secondary_writes != 0) 513 panic("vfs_mount_destroy: nonzero secondary_writes"); 514 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 515 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 516 struct vnode *vp; 517 518 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 519 vn_printf(vp, "dangling vnode "); 520 panic("unmount: dangling vnode"); 521 } 522 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 523 if (mp->mnt_nvnodelistsize != 0) 524 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 525 if (mp->mnt_activevnodelistsize != 0) 526 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 527 if (mp->mnt_tmpfreevnodelistsize != 0) 528 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize"); 529 if (mp->mnt_lockref != 0) 530 panic("vfs_mount_destroy: nonzero lock refcount"); 531 MNT_IUNLOCK(mp); 532 if (mp->mnt_vnodecovered != NULL) 533 vrele(mp->mnt_vnodecovered); 534 #ifdef MAC 535 mac_mount_destroy(mp); 536 #endif 537 if (mp->mnt_opt != NULL) 538 vfs_freeopts(mp->mnt_opt); 539 crfree(mp->mnt_cred); 540 uma_zfree(mount_zone, mp); 541 } 542 543 int 544 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 545 { 546 struct vfsoptlist *optlist; 547 struct vfsopt *opt, *tmp_opt; 548 char *fstype, *fspath, *errmsg; 549 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 550 551 errmsg = fspath = NULL; 552 errmsg_len = fspathlen = 0; 553 errmsg_pos = -1; 554 555 error = vfs_buildopts(fsoptions, &optlist); 556 if (error) 557 return (error); 558 559 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 560 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 561 562 /* 563 * We need these two options before the others, 564 * and they are mandatory for any filesystem. 565 * Ensure they are NUL terminated as well. 566 */ 567 fstypelen = 0; 568 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 569 if (error || fstype[fstypelen - 1] != '\0') { 570 error = EINVAL; 571 if (errmsg != NULL) 572 strncpy(errmsg, "Invalid fstype", errmsg_len); 573 goto bail; 574 } 575 fspathlen = 0; 576 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 577 if (error || fspath[fspathlen - 1] != '\0') { 578 error = EINVAL; 579 if (errmsg != NULL) 580 strncpy(errmsg, "Invalid fspath", errmsg_len); 581 goto bail; 582 } 583 584 /* 585 * We need to see if we have the "update" option 586 * before we call vfs_domount(), since vfs_domount() has special 587 * logic based on MNT_UPDATE. This is very important 588 * when we want to update the root filesystem. 589 */ 590 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 591 if (strcmp(opt->name, "update") == 0) { 592 fsflags |= MNT_UPDATE; 593 vfs_freeopt(optlist, opt); 594 } 595 else if (strcmp(opt->name, "async") == 0) 596 fsflags |= MNT_ASYNC; 597 else if (strcmp(opt->name, "force") == 0) { 598 fsflags |= MNT_FORCE; 599 vfs_freeopt(optlist, opt); 600 } 601 else if (strcmp(opt->name, "reload") == 0) { 602 fsflags |= MNT_RELOAD; 603 vfs_freeopt(optlist, opt); 604 } 605 else if (strcmp(opt->name, "multilabel") == 0) 606 fsflags |= MNT_MULTILABEL; 607 else if (strcmp(opt->name, "noasync") == 0) 608 fsflags &= ~MNT_ASYNC; 609 else if (strcmp(opt->name, "noatime") == 0) 610 fsflags |= MNT_NOATIME; 611 else if (strcmp(opt->name, "atime") == 0) { 612 free(opt->name, M_MOUNT); 613 opt->name = strdup("nonoatime", M_MOUNT); 614 } 615 else if (strcmp(opt->name, "noclusterr") == 0) 616 fsflags |= MNT_NOCLUSTERR; 617 else if (strcmp(opt->name, "clusterr") == 0) { 618 free(opt->name, M_MOUNT); 619 opt->name = strdup("nonoclusterr", M_MOUNT); 620 } 621 else if (strcmp(opt->name, "noclusterw") == 0) 622 fsflags |= MNT_NOCLUSTERW; 623 else if (strcmp(opt->name, "clusterw") == 0) { 624 free(opt->name, M_MOUNT); 625 opt->name = strdup("nonoclusterw", M_MOUNT); 626 } 627 else if (strcmp(opt->name, "noexec") == 0) 628 fsflags |= MNT_NOEXEC; 629 else if (strcmp(opt->name, "exec") == 0) { 630 free(opt->name, M_MOUNT); 631 opt->name = strdup("nonoexec", M_MOUNT); 632 } 633 else if (strcmp(opt->name, "nosuid") == 0) 634 fsflags |= MNT_NOSUID; 635 else if (strcmp(opt->name, "suid") == 0) { 636 free(opt->name, M_MOUNT); 637 opt->name = strdup("nonosuid", M_MOUNT); 638 } 639 else if (strcmp(opt->name, "nosymfollow") == 0) 640 fsflags |= MNT_NOSYMFOLLOW; 641 else if (strcmp(opt->name, "symfollow") == 0) { 642 free(opt->name, M_MOUNT); 643 opt->name = strdup("nonosymfollow", M_MOUNT); 644 } 645 else if (strcmp(opt->name, "noro") == 0) 646 fsflags &= ~MNT_RDONLY; 647 else if (strcmp(opt->name, "rw") == 0) 648 fsflags &= ~MNT_RDONLY; 649 else if (strcmp(opt->name, "ro") == 0) 650 fsflags |= MNT_RDONLY; 651 else if (strcmp(opt->name, "rdonly") == 0) { 652 free(opt->name, M_MOUNT); 653 opt->name = strdup("ro", M_MOUNT); 654 fsflags |= MNT_RDONLY; 655 } 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 else if (strcmp(opt->name, "automounted") == 0) { 663 fsflags |= MNT_AUTOMOUNTED; 664 vfs_freeopt(optlist, opt); 665 } 666 } 667 668 /* 669 * Be ultra-paranoid about making sure the type and fspath 670 * variables will fit in our mp buffers, including the 671 * terminating NUL. 672 */ 673 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 674 error = ENAMETOOLONG; 675 goto bail; 676 } 677 678 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 679 bail: 680 /* copyout the errmsg */ 681 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 682 && errmsg_len > 0 && errmsg != NULL) { 683 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 684 bcopy(errmsg, 685 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 686 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 687 } else { 688 copyout(errmsg, 689 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 690 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 691 } 692 } 693 694 if (optlist != NULL) 695 vfs_freeopts(optlist); 696 return (error); 697 } 698 699 /* 700 * Old mount API. 701 */ 702 #ifndef _SYS_SYSPROTO_H_ 703 struct mount_args { 704 char *type; 705 char *path; 706 int flags; 707 caddr_t data; 708 }; 709 #endif 710 /* ARGSUSED */ 711 int 712 sys_mount(struct thread *td, struct mount_args *uap) 713 { 714 char *fstype; 715 struct vfsconf *vfsp = NULL; 716 struct mntarg *ma = NULL; 717 uint64_t flags; 718 int error; 719 720 /* 721 * Mount flags are now 64-bits. On 32-bit architectures only 722 * 32-bits are passed in, but from here on everything handles 723 * 64-bit flags correctly. 724 */ 725 flags = uap->flags; 726 727 AUDIT_ARG_FFLAGS(flags); 728 729 /* 730 * Filter out MNT_ROOTFS. We do not want clients of mount() in 731 * userspace to set this flag, but we must filter it out if we want 732 * MNT_UPDATE on the root file system to work. 733 * MNT_ROOTFS should only be set by the kernel when mounting its 734 * root file system. 735 */ 736 flags &= ~MNT_ROOTFS; 737 738 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 739 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 740 if (error) { 741 free(fstype, M_TEMP); 742 return (error); 743 } 744 745 AUDIT_ARG_TEXT(fstype); 746 vfsp = vfs_byname_kld(fstype, td, &error); 747 free(fstype, M_TEMP); 748 if (vfsp == NULL) 749 return (ENOENT); 750 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 751 return (EOPNOTSUPP); 752 753 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 754 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 755 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 756 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 757 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 758 759 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 760 return (error); 761 } 762 763 /* 764 * vfs_domount_first(): first file system mount (not update) 765 */ 766 static int 767 vfs_domount_first( 768 struct thread *td, /* Calling thread. */ 769 struct vfsconf *vfsp, /* File system type. */ 770 char *fspath, /* Mount path. */ 771 struct vnode *vp, /* Vnode to be covered. */ 772 uint64_t fsflags, /* Flags common to all filesystems. */ 773 struct vfsoptlist **optlist /* Options local to the filesystem. */ 774 ) 775 { 776 struct vattr va; 777 struct mount *mp; 778 struct vnode *newdp; 779 int error; 780 781 ASSERT_VOP_ELOCKED(vp, __func__); 782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 783 784 /* 785 * If the user is not root, ensure that they own the directory 786 * onto which we are attempting to mount. 787 */ 788 error = VOP_GETATTR(vp, &va, td->td_ucred); 789 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 790 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 791 if (error == 0) 792 error = vinvalbuf(vp, V_SAVE, 0, 0); 793 if (error == 0 && vp->v_type != VDIR) 794 error = ENOTDIR; 795 if (error == 0) { 796 VI_LOCK(vp); 797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 798 vp->v_iflag |= VI_MOUNT; 799 else 800 error = EBUSY; 801 VI_UNLOCK(vp); 802 } 803 if (error != 0) { 804 vput(vp); 805 return (error); 806 } 807 VOP_UNLOCK(vp, 0); 808 809 /* Allocate and initialize the filesystem. */ 810 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 811 /* XXXMAC: pass to vfs_mount_alloc? */ 812 mp->mnt_optnew = *optlist; 813 /* Set the mount level flags. */ 814 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 815 816 /* 817 * Mount the filesystem. 818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 819 * get. No freeing of cn_pnbuf. 820 */ 821 error = VFS_MOUNT(mp); 822 if (error != 0) { 823 vfs_unbusy(mp); 824 mp->mnt_vnodecovered = NULL; 825 vfs_mount_destroy(mp); 826 VI_LOCK(vp); 827 vp->v_iflag &= ~VI_MOUNT; 828 VI_UNLOCK(vp); 829 vrele(vp); 830 return (error); 831 } 832 833 if (mp->mnt_opt != NULL) 834 vfs_freeopts(mp->mnt_opt); 835 mp->mnt_opt = mp->mnt_optnew; 836 *optlist = NULL; 837 (void)VFS_STATFS(mp, &mp->mnt_stat); 838 839 /* 840 * Prevent external consumers of mount options from reading mnt_optnew. 841 */ 842 mp->mnt_optnew = NULL; 843 844 MNT_ILOCK(mp); 845 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 846 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 847 mp->mnt_kern_flag |= MNTK_ASYNC; 848 else 849 mp->mnt_kern_flag &= ~MNTK_ASYNC; 850 MNT_IUNLOCK(mp); 851 852 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 853 cache_purge(vp); 854 VI_LOCK(vp); 855 vp->v_iflag &= ~VI_MOUNT; 856 VI_UNLOCK(vp); 857 vp->v_mountedhere = mp; 858 /* Place the new filesystem at the end of the mount list. */ 859 mtx_lock(&mountlist_mtx); 860 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 861 mtx_unlock(&mountlist_mtx); 862 vfs_event_signal(NULL, VQ_MOUNT, 0); 863 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 864 panic("mount: lost mount"); 865 VOP_UNLOCK(vp, 0); 866 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td); 867 VOP_UNLOCK(newdp, 0); 868 mountcheckdirs(vp, newdp); 869 vrele(newdp); 870 if ((mp->mnt_flag & MNT_RDONLY) == 0) 871 vfs_allocate_syncvnode(mp); 872 vfs_unbusy(mp); 873 return (0); 874 } 875 876 /* 877 * vfs_domount_update(): update of mounted file system 878 */ 879 static int 880 vfs_domount_update( 881 struct thread *td, /* Calling thread. */ 882 struct vnode *vp, /* Mount point vnode. */ 883 uint64_t fsflags, /* Flags common to all filesystems. */ 884 struct vfsoptlist **optlist /* Options local to the filesystem. */ 885 ) 886 { 887 struct export_args export; 888 void *bufp; 889 struct mount *mp; 890 int error, export_error, len; 891 uint64_t flag; 892 893 ASSERT_VOP_ELOCKED(vp, __func__); 894 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 895 mp = vp->v_mount; 896 897 if ((vp->v_vflag & VV_ROOT) == 0) { 898 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 899 == 0) 900 error = EXDEV; 901 else 902 error = EINVAL; 903 vput(vp); 904 return (error); 905 } 906 907 /* 908 * We only allow the filesystem to be reloaded if it 909 * is currently mounted read-only. 910 */ 911 flag = mp->mnt_flag; 912 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 913 vput(vp); 914 return (EOPNOTSUPP); /* Needs translation */ 915 } 916 /* 917 * Only privileged root, or (if MNT_USER is set) the user that 918 * did the original mount is permitted to update it. 919 */ 920 error = vfs_suser(mp, td); 921 if (error != 0) { 922 vput(vp); 923 return (error); 924 } 925 if (vfs_busy(mp, MBF_NOWAIT)) { 926 vput(vp); 927 return (EBUSY); 928 } 929 VI_LOCK(vp); 930 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 931 VI_UNLOCK(vp); 932 vfs_unbusy(mp); 933 vput(vp); 934 return (EBUSY); 935 } 936 vp->v_iflag |= VI_MOUNT; 937 VI_UNLOCK(vp); 938 VOP_UNLOCK(vp, 0); 939 940 MNT_ILOCK(mp); 941 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 942 MNT_IUNLOCK(mp); 943 error = EBUSY; 944 goto end; 945 } 946 mp->mnt_flag &= ~MNT_UPDATEMASK; 947 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 948 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 949 if ((mp->mnt_flag & MNT_ASYNC) == 0) 950 mp->mnt_kern_flag &= ~MNTK_ASYNC; 951 MNT_IUNLOCK(mp); 952 mp->mnt_optnew = *optlist; 953 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 954 955 /* 956 * Mount the filesystem. 957 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 958 * get. No freeing of cn_pnbuf. 959 */ 960 error = VFS_MOUNT(mp); 961 962 export_error = 0; 963 /* Process the export option. */ 964 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 965 &len) == 0) { 966 /* Assume that there is only 1 ABI for each length. */ 967 switch (len) { 968 case (sizeof(struct oexport_args)): 969 bzero(&export, sizeof(export)); 970 /* FALLTHROUGH */ 971 case (sizeof(export)): 972 bcopy(bufp, &export, len); 973 export_error = vfs_export(mp, &export); 974 break; 975 default: 976 export_error = EINVAL; 977 break; 978 } 979 } 980 981 MNT_ILOCK(mp); 982 if (error == 0) { 983 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 984 MNT_SNAPSHOT); 985 } else { 986 /* 987 * If we fail, restore old mount flags. MNT_QUOTA is special, 988 * because it is not part of MNT_UPDATEMASK, but it could have 989 * changed in the meantime if quotactl(2) was called. 990 * All in all we want current value of MNT_QUOTA, not the old 991 * one. 992 */ 993 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 994 } 995 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 996 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 997 mp->mnt_kern_flag |= MNTK_ASYNC; 998 else 999 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1000 MNT_IUNLOCK(mp); 1001 1002 if (error != 0) 1003 goto end; 1004 1005 if (mp->mnt_opt != NULL) 1006 vfs_freeopts(mp->mnt_opt); 1007 mp->mnt_opt = mp->mnt_optnew; 1008 *optlist = NULL; 1009 (void)VFS_STATFS(mp, &mp->mnt_stat); 1010 /* 1011 * Prevent external consumers of mount options from reading 1012 * mnt_optnew. 1013 */ 1014 mp->mnt_optnew = NULL; 1015 1016 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1017 vfs_allocate_syncvnode(mp); 1018 else 1019 vfs_deallocate_syncvnode(mp); 1020 end: 1021 vfs_unbusy(mp); 1022 VI_LOCK(vp); 1023 vp->v_iflag &= ~VI_MOUNT; 1024 VI_UNLOCK(vp); 1025 vrele(vp); 1026 return (error != 0 ? error : export_error); 1027 } 1028 1029 /* 1030 * vfs_domount(): actually attempt a filesystem mount. 1031 */ 1032 static int 1033 vfs_domount( 1034 struct thread *td, /* Calling thread. */ 1035 const char *fstype, /* Filesystem type. */ 1036 char *fspath, /* Mount path. */ 1037 uint64_t fsflags, /* Flags common to all filesystems. */ 1038 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1039 ) 1040 { 1041 struct vfsconf *vfsp; 1042 struct nameidata nd; 1043 struct vnode *vp; 1044 char *pathbuf; 1045 int error; 1046 1047 /* 1048 * Be ultra-paranoid about making sure the type and fspath 1049 * variables will fit in our mp buffers, including the 1050 * terminating NUL. 1051 */ 1052 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1053 return (ENAMETOOLONG); 1054 1055 if (jailed(td->td_ucred) || usermount == 0) { 1056 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1057 return (error); 1058 } 1059 1060 /* 1061 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1062 */ 1063 if (fsflags & MNT_EXPORTED) { 1064 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1065 if (error) 1066 return (error); 1067 } 1068 if (fsflags & MNT_SUIDDIR) { 1069 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1070 if (error) 1071 return (error); 1072 } 1073 /* 1074 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1075 */ 1076 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1077 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1078 fsflags |= MNT_NOSUID | MNT_USER; 1079 } 1080 1081 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1082 vfsp = NULL; 1083 if ((fsflags & MNT_UPDATE) == 0) { 1084 /* Don't try to load KLDs if we're mounting the root. */ 1085 if (fsflags & MNT_ROOTFS) 1086 vfsp = vfs_byname(fstype); 1087 else 1088 vfsp = vfs_byname_kld(fstype, td, &error); 1089 if (vfsp == NULL) 1090 return (ENODEV); 1091 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1092 return (EPERM); 1093 } 1094 1095 /* 1096 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1097 */ 1098 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1099 UIO_SYSSPACE, fspath, td); 1100 error = namei(&nd); 1101 if (error != 0) 1102 return (error); 1103 NDFREE(&nd, NDF_ONLY_PNBUF); 1104 vp = nd.ni_vp; 1105 if ((fsflags & MNT_UPDATE) == 0) { 1106 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1107 strcpy(pathbuf, fspath); 1108 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1109 /* debug.disablefullpath == 1 results in ENODEV */ 1110 if (error == 0 || error == ENODEV) { 1111 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1112 fsflags, optlist); 1113 } 1114 free(pathbuf, M_TEMP); 1115 } else 1116 error = vfs_domount_update(td, vp, fsflags, optlist); 1117 1118 return (error); 1119 } 1120 1121 /* 1122 * Unmount a filesystem. 1123 * 1124 * Note: unmount takes a path to the vnode mounted on as argument, not 1125 * special file (as before). 1126 */ 1127 #ifndef _SYS_SYSPROTO_H_ 1128 struct unmount_args { 1129 char *path; 1130 int flags; 1131 }; 1132 #endif 1133 /* ARGSUSED */ 1134 int 1135 sys_unmount(struct thread *td, struct unmount_args *uap) 1136 { 1137 struct nameidata nd; 1138 struct mount *mp; 1139 char *pathbuf; 1140 int error, id0, id1; 1141 1142 AUDIT_ARG_VALUE(uap->flags); 1143 if (jailed(td->td_ucred) || usermount == 0) { 1144 error = priv_check(td, PRIV_VFS_UNMOUNT); 1145 if (error) 1146 return (error); 1147 } 1148 1149 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1150 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1151 if (error) { 1152 free(pathbuf, M_TEMP); 1153 return (error); 1154 } 1155 if (uap->flags & MNT_BYFSID) { 1156 AUDIT_ARG_TEXT(pathbuf); 1157 /* Decode the filesystem ID. */ 1158 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1159 free(pathbuf, M_TEMP); 1160 return (EINVAL); 1161 } 1162 1163 mtx_lock(&mountlist_mtx); 1164 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1165 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1166 mp->mnt_stat.f_fsid.val[1] == id1) { 1167 vfs_ref(mp); 1168 break; 1169 } 1170 } 1171 mtx_unlock(&mountlist_mtx); 1172 } else { 1173 /* 1174 * Try to find global path for path argument. 1175 */ 1176 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1177 UIO_SYSSPACE, pathbuf, td); 1178 if (namei(&nd) == 0) { 1179 NDFREE(&nd, NDF_ONLY_PNBUF); 1180 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1181 MNAMELEN); 1182 if (error == 0 || error == ENODEV) 1183 vput(nd.ni_vp); 1184 } 1185 mtx_lock(&mountlist_mtx); 1186 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1187 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1188 vfs_ref(mp); 1189 break; 1190 } 1191 } 1192 mtx_unlock(&mountlist_mtx); 1193 } 1194 free(pathbuf, M_TEMP); 1195 if (mp == NULL) { 1196 /* 1197 * Previously we returned ENOENT for a nonexistent path and 1198 * EINVAL for a non-mountpoint. We cannot tell these apart 1199 * now, so in the !MNT_BYFSID case return the more likely 1200 * EINVAL for compatibility. 1201 */ 1202 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1203 } 1204 1205 /* 1206 * Don't allow unmounting the root filesystem. 1207 */ 1208 if (mp->mnt_flag & MNT_ROOTFS) { 1209 vfs_rel(mp); 1210 return (EINVAL); 1211 } 1212 error = dounmount(mp, uap->flags, td); 1213 return (error); 1214 } 1215 1216 /* 1217 * Return error if any of the vnodes, ignoring the root vnode 1218 * and the syncer vnode, have non-zero usecount. 1219 * 1220 * This function is purely advisory - it can return false positives 1221 * and negatives. 1222 */ 1223 static int 1224 vfs_check_usecounts(struct mount *mp) 1225 { 1226 struct vnode *vp, *mvp; 1227 1228 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1229 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1230 vp->v_usecount != 0) { 1231 VI_UNLOCK(vp); 1232 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1233 return (EBUSY); 1234 } 1235 VI_UNLOCK(vp); 1236 } 1237 1238 return (0); 1239 } 1240 1241 static void 1242 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags) 1243 { 1244 1245 mtx_assert(MNT_MTX(mp), MA_OWNED); 1246 mp->mnt_kern_flag &= ~mntkflags; 1247 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) { 1248 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1249 wakeup(mp); 1250 } 1251 MNT_IUNLOCK(mp); 1252 if (coveredvp != NULL) { 1253 VOP_UNLOCK(coveredvp, 0); 1254 vdrop(coveredvp); 1255 } 1256 vn_finished_write(mp); 1257 } 1258 1259 /* 1260 * Do the actual filesystem unmount. 1261 */ 1262 int 1263 dounmount(struct mount *mp, int flags, struct thread *td) 1264 { 1265 struct vnode *coveredvp; 1266 int error; 1267 uint64_t async_flag; 1268 int mnt_gen_r; 1269 1270 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1271 mnt_gen_r = mp->mnt_gen; 1272 VI_LOCK(coveredvp); 1273 vholdl(coveredvp); 1274 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1275 /* 1276 * Check for mp being unmounted while waiting for the 1277 * covered vnode lock. 1278 */ 1279 if (coveredvp->v_mountedhere != mp || 1280 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1281 VOP_UNLOCK(coveredvp, 0); 1282 vdrop(coveredvp); 1283 vfs_rel(mp); 1284 return (EBUSY); 1285 } 1286 } 1287 1288 /* 1289 * Only privileged root, or (if MNT_USER is set) the user that did the 1290 * original mount is permitted to unmount this filesystem. 1291 */ 1292 error = vfs_suser(mp, td); 1293 if (error != 0) { 1294 if (coveredvp != NULL) { 1295 VOP_UNLOCK(coveredvp, 0); 1296 vdrop(coveredvp); 1297 } 1298 vfs_rel(mp); 1299 return (error); 1300 } 1301 1302 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1303 MNT_ILOCK(mp); 1304 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1305 (mp->mnt_flag & MNT_UPDATE) != 0 || 1306 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1307 dounmount_cleanup(mp, coveredvp, 0); 1308 return (EBUSY); 1309 } 1310 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1311 if (flags & MNT_NONBUSY) { 1312 MNT_IUNLOCK(mp); 1313 error = vfs_check_usecounts(mp); 1314 MNT_ILOCK(mp); 1315 if (error != 0) { 1316 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT | 1317 MNTK_NOINSMNTQ); 1318 return (error); 1319 } 1320 } 1321 /* Allow filesystems to detect that a forced unmount is in progress. */ 1322 if (flags & MNT_FORCE) { 1323 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1324 MNT_IUNLOCK(mp); 1325 /* 1326 * Must be done after setting MNTK_UNMOUNTF and before 1327 * waiting for mnt_lockref to become 0. 1328 */ 1329 VFS_PURGE(mp); 1330 MNT_ILOCK(mp); 1331 } 1332 error = 0; 1333 if (mp->mnt_lockref) { 1334 mp->mnt_kern_flag |= MNTK_DRAINING; 1335 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1336 "mount drain", 0); 1337 } 1338 MNT_IUNLOCK(mp); 1339 KASSERT(mp->mnt_lockref == 0, 1340 ("%s: invalid lock refcount in the drain path @ %s:%d", 1341 __func__, __FILE__, __LINE__)); 1342 KASSERT(error == 0, 1343 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1344 __func__, __FILE__, __LINE__)); 1345 1346 if (mp->mnt_flag & MNT_EXPUBLIC) 1347 vfs_setpublicfs(NULL, NULL, NULL); 1348 1349 /* 1350 * From now, we can claim that the use reference on the 1351 * coveredvp is ours, and the ref can be released only by 1352 * successfull unmount by us, or left for later unmount 1353 * attempt. The previously acquired hold reference is no 1354 * longer needed to protect the vnode from reuse. 1355 */ 1356 if (coveredvp != NULL) 1357 vdrop(coveredvp); 1358 1359 vfs_msync(mp, MNT_WAIT); 1360 MNT_ILOCK(mp); 1361 async_flag = mp->mnt_flag & MNT_ASYNC; 1362 mp->mnt_flag &= ~MNT_ASYNC; 1363 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1364 MNT_IUNLOCK(mp); 1365 cache_purgevfs(mp, false); /* remove cache entries for this file sys */ 1366 vfs_deallocate_syncvnode(mp); 1367 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1368 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1369 error = VFS_UNMOUNT(mp, flags); 1370 vn_finished_write(mp); 1371 /* 1372 * If we failed to flush the dirty blocks for this mount point, 1373 * undo all the cdir/rdir and rootvnode changes we made above. 1374 * Unless we failed to do so because the device is reporting that 1375 * it doesn't exist anymore. 1376 */ 1377 if (error && error != ENXIO) { 1378 MNT_ILOCK(mp); 1379 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1380 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1381 MNT_IUNLOCK(mp); 1382 vfs_allocate_syncvnode(mp); 1383 MNT_ILOCK(mp); 1384 } 1385 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1386 mp->mnt_flag |= async_flag; 1387 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1388 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1389 mp->mnt_kern_flag |= MNTK_ASYNC; 1390 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1391 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1392 wakeup(mp); 1393 } 1394 MNT_IUNLOCK(mp); 1395 if (coveredvp) 1396 VOP_UNLOCK(coveredvp, 0); 1397 return (error); 1398 } 1399 mtx_lock(&mountlist_mtx); 1400 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1401 mtx_unlock(&mountlist_mtx); 1402 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td); 1403 if (coveredvp != NULL) { 1404 coveredvp->v_mountedhere = NULL; 1405 VOP_UNLOCK(coveredvp, 0); 1406 } 1407 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1408 if (rootvnode != NULL && mp == rootvnode->v_mount) { 1409 vrele(rootvnode); 1410 rootvnode = NULL; 1411 } 1412 if (mp == rootdevmp) 1413 rootdevmp = NULL; 1414 vfs_mount_destroy(mp); 1415 return (0); 1416 } 1417 1418 /* 1419 * Report errors during filesystem mounting. 1420 */ 1421 void 1422 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1423 { 1424 struct vfsoptlist *moptlist = mp->mnt_optnew; 1425 va_list ap; 1426 int error, len; 1427 char *errmsg; 1428 1429 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1430 if (error || errmsg == NULL || len <= 0) 1431 return; 1432 1433 va_start(ap, fmt); 1434 vsnprintf(errmsg, (size_t)len, fmt, ap); 1435 va_end(ap); 1436 } 1437 1438 void 1439 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1440 { 1441 va_list ap; 1442 int error, len; 1443 char *errmsg; 1444 1445 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1446 if (error || errmsg == NULL || len <= 0) 1447 return; 1448 1449 va_start(ap, fmt); 1450 vsnprintf(errmsg, (size_t)len, fmt, ap); 1451 va_end(ap); 1452 } 1453 1454 /* 1455 * --------------------------------------------------------------------- 1456 * Functions for querying mount options/arguments from filesystems. 1457 */ 1458 1459 /* 1460 * Check that no unknown options are given 1461 */ 1462 int 1463 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1464 { 1465 struct vfsopt *opt; 1466 char errmsg[255]; 1467 const char **t, *p, *q; 1468 int ret = 0; 1469 1470 TAILQ_FOREACH(opt, opts, link) { 1471 p = opt->name; 1472 q = NULL; 1473 if (p[0] == 'n' && p[1] == 'o') 1474 q = p + 2; 1475 for(t = global_opts; *t != NULL; t++) { 1476 if (strcmp(*t, p) == 0) 1477 break; 1478 if (q != NULL) { 1479 if (strcmp(*t, q) == 0) 1480 break; 1481 } 1482 } 1483 if (*t != NULL) 1484 continue; 1485 for(t = legal; *t != NULL; t++) { 1486 if (strcmp(*t, p) == 0) 1487 break; 1488 if (q != NULL) { 1489 if (strcmp(*t, q) == 0) 1490 break; 1491 } 1492 } 1493 if (*t != NULL) 1494 continue; 1495 snprintf(errmsg, sizeof(errmsg), 1496 "mount option <%s> is unknown", p); 1497 ret = EINVAL; 1498 } 1499 if (ret != 0) { 1500 TAILQ_FOREACH(opt, opts, link) { 1501 if (strcmp(opt->name, "errmsg") == 0) { 1502 strncpy((char *)opt->value, errmsg, opt->len); 1503 break; 1504 } 1505 } 1506 if (opt == NULL) 1507 printf("%s\n", errmsg); 1508 } 1509 return (ret); 1510 } 1511 1512 /* 1513 * Get a mount option by its name. 1514 * 1515 * Return 0 if the option was found, ENOENT otherwise. 1516 * If len is non-NULL it will be filled with the length 1517 * of the option. If buf is non-NULL, it will be filled 1518 * with the address of the option. 1519 */ 1520 int 1521 vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len) 1522 { 1523 struct vfsopt *opt; 1524 1525 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1526 1527 TAILQ_FOREACH(opt, opts, link) { 1528 if (strcmp(name, opt->name) == 0) { 1529 opt->seen = 1; 1530 if (len != NULL) 1531 *len = opt->len; 1532 if (buf != NULL) 1533 *buf = opt->value; 1534 return (0); 1535 } 1536 } 1537 return (ENOENT); 1538 } 1539 1540 int 1541 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1542 { 1543 struct vfsopt *opt; 1544 1545 if (opts == NULL) 1546 return (-1); 1547 1548 TAILQ_FOREACH(opt, opts, link) { 1549 if (strcmp(name, opt->name) == 0) { 1550 opt->seen = 1; 1551 return (opt->pos); 1552 } 1553 } 1554 return (-1); 1555 } 1556 1557 int 1558 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1559 { 1560 char *opt_value, *vtp; 1561 quad_t iv; 1562 int error, opt_len; 1563 1564 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1565 if (error != 0) 1566 return (error); 1567 if (opt_len == 0 || opt_value == NULL) 1568 return (EINVAL); 1569 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1570 return (EINVAL); 1571 iv = strtoq(opt_value, &vtp, 0); 1572 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1573 return (EINVAL); 1574 if (iv < 0) 1575 return (EINVAL); 1576 switch (vtp[0]) { 1577 case 't': 1578 case 'T': 1579 iv *= 1024; 1580 case 'g': 1581 case 'G': 1582 iv *= 1024; 1583 case 'm': 1584 case 'M': 1585 iv *= 1024; 1586 case 'k': 1587 case 'K': 1588 iv *= 1024; 1589 case '\0': 1590 break; 1591 default: 1592 return (EINVAL); 1593 } 1594 *value = iv; 1595 1596 return (0); 1597 } 1598 1599 char * 1600 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1601 { 1602 struct vfsopt *opt; 1603 1604 *error = 0; 1605 TAILQ_FOREACH(opt, opts, link) { 1606 if (strcmp(name, opt->name) != 0) 1607 continue; 1608 opt->seen = 1; 1609 if (opt->len == 0 || 1610 ((char *)opt->value)[opt->len - 1] != '\0') { 1611 *error = EINVAL; 1612 return (NULL); 1613 } 1614 return (opt->value); 1615 } 1616 *error = ENOENT; 1617 return (NULL); 1618 } 1619 1620 int 1621 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1622 uint64_t val) 1623 { 1624 struct vfsopt *opt; 1625 1626 TAILQ_FOREACH(opt, opts, link) { 1627 if (strcmp(name, opt->name) == 0) { 1628 opt->seen = 1; 1629 if (w != NULL) 1630 *w |= val; 1631 return (1); 1632 } 1633 } 1634 if (w != NULL) 1635 *w &= ~val; 1636 return (0); 1637 } 1638 1639 int 1640 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1641 { 1642 va_list ap; 1643 struct vfsopt *opt; 1644 int ret; 1645 1646 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1647 1648 TAILQ_FOREACH(opt, opts, link) { 1649 if (strcmp(name, opt->name) != 0) 1650 continue; 1651 opt->seen = 1; 1652 if (opt->len == 0 || opt->value == NULL) 1653 return (0); 1654 if (((char *)opt->value)[opt->len - 1] != '\0') 1655 return (0); 1656 va_start(ap, fmt); 1657 ret = vsscanf(opt->value, fmt, ap); 1658 va_end(ap); 1659 return (ret); 1660 } 1661 return (0); 1662 } 1663 1664 int 1665 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1666 { 1667 struct vfsopt *opt; 1668 1669 TAILQ_FOREACH(opt, opts, link) { 1670 if (strcmp(name, opt->name) != 0) 1671 continue; 1672 opt->seen = 1; 1673 if (opt->value == NULL) 1674 opt->len = len; 1675 else { 1676 if (opt->len != len) 1677 return (EINVAL); 1678 bcopy(value, opt->value, len); 1679 } 1680 return (0); 1681 } 1682 return (ENOENT); 1683 } 1684 1685 int 1686 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1687 { 1688 struct vfsopt *opt; 1689 1690 TAILQ_FOREACH(opt, opts, link) { 1691 if (strcmp(name, opt->name) != 0) 1692 continue; 1693 opt->seen = 1; 1694 if (opt->value == NULL) 1695 opt->len = len; 1696 else { 1697 if (opt->len < len) 1698 return (EINVAL); 1699 opt->len = len; 1700 bcopy(value, opt->value, len); 1701 } 1702 return (0); 1703 } 1704 return (ENOENT); 1705 } 1706 1707 int 1708 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1709 { 1710 struct vfsopt *opt; 1711 1712 TAILQ_FOREACH(opt, opts, link) { 1713 if (strcmp(name, opt->name) != 0) 1714 continue; 1715 opt->seen = 1; 1716 if (opt->value == NULL) 1717 opt->len = strlen(value) + 1; 1718 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1719 return (EINVAL); 1720 return (0); 1721 } 1722 return (ENOENT); 1723 } 1724 1725 /* 1726 * Find and copy a mount option. 1727 * 1728 * The size of the buffer has to be specified 1729 * in len, if it is not the same length as the 1730 * mount option, EINVAL is returned. 1731 * Returns ENOENT if the option is not found. 1732 */ 1733 int 1734 vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len) 1735 { 1736 struct vfsopt *opt; 1737 1738 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1739 1740 TAILQ_FOREACH(opt, opts, link) { 1741 if (strcmp(name, opt->name) == 0) { 1742 opt->seen = 1; 1743 if (len != opt->len) 1744 return (EINVAL); 1745 bcopy(opt->value, dest, opt->len); 1746 return (0); 1747 } 1748 } 1749 return (ENOENT); 1750 } 1751 1752 int 1753 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1754 { 1755 int error; 1756 1757 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1758 if (sbp != &mp->mnt_stat) 1759 *sbp = mp->mnt_stat; 1760 return (error); 1761 } 1762 1763 void 1764 vfs_mountedfrom(struct mount *mp, const char *from) 1765 { 1766 1767 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1768 strlcpy(mp->mnt_stat.f_mntfromname, from, 1769 sizeof mp->mnt_stat.f_mntfromname); 1770 } 1771 1772 /* 1773 * --------------------------------------------------------------------- 1774 * This is the api for building mount args and mounting filesystems from 1775 * inside the kernel. 1776 * 1777 * The API works by accumulation of individual args. First error is 1778 * latched. 1779 * 1780 * XXX: should be documented in new manpage kernel_mount(9) 1781 */ 1782 1783 /* A memory allocation which must be freed when we are done */ 1784 struct mntaarg { 1785 SLIST_ENTRY(mntaarg) next; 1786 }; 1787 1788 /* The header for the mount arguments */ 1789 struct mntarg { 1790 struct iovec *v; 1791 int len; 1792 int error; 1793 SLIST_HEAD(, mntaarg) list; 1794 }; 1795 1796 /* 1797 * Add a boolean argument. 1798 * 1799 * flag is the boolean value. 1800 * name must start with "no". 1801 */ 1802 struct mntarg * 1803 mount_argb(struct mntarg *ma, int flag, const char *name) 1804 { 1805 1806 KASSERT(name[0] == 'n' && name[1] == 'o', 1807 ("mount_argb(...,%s): name must start with 'no'", name)); 1808 1809 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1810 } 1811 1812 /* 1813 * Add an argument printf style 1814 */ 1815 struct mntarg * 1816 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1817 { 1818 va_list ap; 1819 struct mntaarg *maa; 1820 struct sbuf *sb; 1821 int len; 1822 1823 if (ma == NULL) { 1824 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1825 SLIST_INIT(&ma->list); 1826 } 1827 if (ma->error) 1828 return (ma); 1829 1830 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1831 M_MOUNT, M_WAITOK); 1832 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1833 ma->v[ma->len].iov_len = strlen(name) + 1; 1834 ma->len++; 1835 1836 sb = sbuf_new_auto(); 1837 va_start(ap, fmt); 1838 sbuf_vprintf(sb, fmt, ap); 1839 va_end(ap); 1840 sbuf_finish(sb); 1841 len = sbuf_len(sb) + 1; 1842 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1843 SLIST_INSERT_HEAD(&ma->list, maa, next); 1844 bcopy(sbuf_data(sb), maa + 1, len); 1845 sbuf_delete(sb); 1846 1847 ma->v[ma->len].iov_base = maa + 1; 1848 ma->v[ma->len].iov_len = len; 1849 ma->len++; 1850 1851 return (ma); 1852 } 1853 1854 /* 1855 * Add an argument which is a userland string. 1856 */ 1857 struct mntarg * 1858 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1859 { 1860 struct mntaarg *maa; 1861 char *tbuf; 1862 1863 if (val == NULL) 1864 return (ma); 1865 if (ma == NULL) { 1866 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1867 SLIST_INIT(&ma->list); 1868 } 1869 if (ma->error) 1870 return (ma); 1871 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1872 SLIST_INSERT_HEAD(&ma->list, maa, next); 1873 tbuf = (void *)(maa + 1); 1874 ma->error = copyinstr(val, tbuf, len, NULL); 1875 return (mount_arg(ma, name, tbuf, -1)); 1876 } 1877 1878 /* 1879 * Plain argument. 1880 * 1881 * If length is -1, treat value as a C string. 1882 */ 1883 struct mntarg * 1884 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1885 { 1886 1887 if (ma == NULL) { 1888 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1889 SLIST_INIT(&ma->list); 1890 } 1891 if (ma->error) 1892 return (ma); 1893 1894 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1895 M_MOUNT, M_WAITOK); 1896 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1897 ma->v[ma->len].iov_len = strlen(name) + 1; 1898 ma->len++; 1899 1900 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1901 if (len < 0) 1902 ma->v[ma->len].iov_len = strlen(val) + 1; 1903 else 1904 ma->v[ma->len].iov_len = len; 1905 ma->len++; 1906 return (ma); 1907 } 1908 1909 /* 1910 * Free a mntarg structure 1911 */ 1912 static void 1913 free_mntarg(struct mntarg *ma) 1914 { 1915 struct mntaarg *maa; 1916 1917 while (!SLIST_EMPTY(&ma->list)) { 1918 maa = SLIST_FIRST(&ma->list); 1919 SLIST_REMOVE_HEAD(&ma->list, next); 1920 free(maa, M_MOUNT); 1921 } 1922 free(ma->v, M_MOUNT); 1923 free(ma, M_MOUNT); 1924 } 1925 1926 /* 1927 * Mount a filesystem 1928 */ 1929 int 1930 kernel_mount(struct mntarg *ma, uint64_t flags) 1931 { 1932 struct uio auio; 1933 int error; 1934 1935 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1936 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1937 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1938 1939 auio.uio_iov = ma->v; 1940 auio.uio_iovcnt = ma->len; 1941 auio.uio_segflg = UIO_SYSSPACE; 1942 1943 error = ma->error; 1944 if (!error) 1945 error = vfs_donmount(curthread, flags, &auio); 1946 free_mntarg(ma); 1947 return (error); 1948 } 1949 1950 /* 1951 * A printflike function to mount a filesystem. 1952 */ 1953 int 1954 kernel_vmount(int flags, ...) 1955 { 1956 struct mntarg *ma = NULL; 1957 va_list ap; 1958 const char *cp; 1959 const void *vp; 1960 int error; 1961 1962 va_start(ap, flags); 1963 for (;;) { 1964 cp = va_arg(ap, const char *); 1965 if (cp == NULL) 1966 break; 1967 vp = va_arg(ap, const void *); 1968 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1969 } 1970 va_end(ap); 1971 1972 error = kernel_mount(ma, flags); 1973 return (error); 1974 } 1975 1976 void 1977 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1978 { 1979 1980 bcopy(oexp, exp, sizeof(*oexp)); 1981 exp->ex_numsecflavors = 0; 1982 } 1983