1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1999-2004 Poul-Henning Kamp 5 * Copyright (c) 1999 Michael Smith 6 * Copyright (c) 1989, 1993 7 * The Regents of the University of California. All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/eventhandler.h> 45 #include <sys/fcntl.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/libkern.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mutex.h> 52 #include <sys/namei.h> 53 #include <sys/priv.h> 54 #include <sys/proc.h> 55 #include <sys/filedesc.h> 56 #include <sys/reboot.h> 57 #include <sys/sbuf.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysproto.h> 60 #include <sys/sx.h> 61 #include <sys/sysctl.h> 62 #include <sys/sysent.h> 63 #include <sys/systm.h> 64 #include <sys/vnode.h> 65 #include <vm/uma.h> 66 67 #include <geom/geom.h> 68 69 #include <machine/stdarg.h> 70 71 #include <security/audit/audit.h> 72 #include <security/mac/mac_framework.h> 73 74 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 75 76 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 77 uint64_t fsflags, struct vfsoptlist **optlist); 78 static void free_mntarg(struct mntarg *ma); 79 80 static int usermount = 0; 81 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 82 "Unprivileged users may mount and unmount file systems"); 83 84 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 85 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure"); 86 static uma_zone_t mount_zone; 87 88 /* List of mounted filesystems. */ 89 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 90 91 /* For any iteration/modification of mountlist */ 92 struct mtx mountlist_mtx; 93 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 94 95 EVENTHANDLER_LIST_DEFINE(vfs_mounted); 96 EVENTHANDLER_LIST_DEFINE(vfs_unmounted); 97 98 /* 99 * Global opts, taken by all filesystems 100 */ 101 static const char *global_opts[] = { 102 "errmsg", 103 "fstype", 104 "fspath", 105 "ro", 106 "rw", 107 "nosuid", 108 "noexec", 109 NULL 110 }; 111 112 static int 113 mount_init(void *mem, int size, int flags) 114 { 115 struct mount *mp; 116 117 mp = (struct mount *)mem; 118 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 119 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF); 120 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 121 return (0); 122 } 123 124 static void 125 mount_fini(void *mem, int size) 126 { 127 struct mount *mp; 128 129 mp = (struct mount *)mem; 130 lockdestroy(&mp->mnt_explock); 131 mtx_destroy(&mp->mnt_listmtx); 132 mtx_destroy(&mp->mnt_mtx); 133 } 134 135 static void 136 vfs_mount_init(void *dummy __unused) 137 { 138 139 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 140 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 141 } 142 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 143 144 /* 145 * --------------------------------------------------------------------- 146 * Functions for building and sanitizing the mount options 147 */ 148 149 /* Remove one mount option. */ 150 static void 151 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 152 { 153 154 TAILQ_REMOVE(opts, opt, link); 155 free(opt->name, M_MOUNT); 156 if (opt->value != NULL) 157 free(opt->value, M_MOUNT); 158 free(opt, M_MOUNT); 159 } 160 161 /* Release all resources related to the mount options. */ 162 void 163 vfs_freeopts(struct vfsoptlist *opts) 164 { 165 struct vfsopt *opt; 166 167 while (!TAILQ_EMPTY(opts)) { 168 opt = TAILQ_FIRST(opts); 169 vfs_freeopt(opts, opt); 170 } 171 free(opts, M_MOUNT); 172 } 173 174 void 175 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 176 { 177 struct vfsopt *opt, *temp; 178 179 if (opts == NULL) 180 return; 181 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 182 if (strcmp(opt->name, name) == 0) 183 vfs_freeopt(opts, opt); 184 } 185 } 186 187 static int 188 vfs_isopt_ro(const char *opt) 189 { 190 191 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 192 strcmp(opt, "norw") == 0) 193 return (1); 194 return (0); 195 } 196 197 static int 198 vfs_isopt_rw(const char *opt) 199 { 200 201 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 202 return (1); 203 return (0); 204 } 205 206 /* 207 * Check if options are equal (with or without the "no" prefix). 208 */ 209 static int 210 vfs_equalopts(const char *opt1, const char *opt2) 211 { 212 char *p; 213 214 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 215 if (strcmp(opt1, opt2) == 0) 216 return (1); 217 /* "noopt" vs. "opt" */ 218 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 219 return (1); 220 /* "opt" vs. "noopt" */ 221 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 222 return (1); 223 while ((p = strchr(opt1, '.')) != NULL && 224 !strncmp(opt1, opt2, ++p - opt1)) { 225 opt2 += p - opt1; 226 opt1 = p; 227 /* "foo.noopt" vs. "foo.opt" */ 228 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 229 return (1); 230 /* "foo.opt" vs. "foo.noopt" */ 231 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 232 return (1); 233 } 234 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 235 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 236 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 237 return (1); 238 return (0); 239 } 240 241 /* 242 * If a mount option is specified several times, 243 * (with or without the "no" prefix) only keep 244 * the last occurrence of it. 245 */ 246 static void 247 vfs_sanitizeopts(struct vfsoptlist *opts) 248 { 249 struct vfsopt *opt, *opt2, *tmp; 250 251 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 252 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 253 while (opt2 != NULL) { 254 if (vfs_equalopts(opt->name, opt2->name)) { 255 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 256 vfs_freeopt(opts, opt2); 257 opt2 = tmp; 258 } else { 259 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 260 } 261 } 262 } 263 } 264 265 /* 266 * Build a linked list of mount options from a struct uio. 267 */ 268 int 269 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 270 { 271 struct vfsoptlist *opts; 272 struct vfsopt *opt; 273 size_t memused, namelen, optlen; 274 unsigned int i, iovcnt; 275 int error; 276 277 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 278 TAILQ_INIT(opts); 279 memused = 0; 280 iovcnt = auio->uio_iovcnt; 281 for (i = 0; i < iovcnt; i += 2) { 282 namelen = auio->uio_iov[i].iov_len; 283 optlen = auio->uio_iov[i + 1].iov_len; 284 memused += sizeof(struct vfsopt) + optlen + namelen; 285 /* 286 * Avoid consuming too much memory, and attempts to overflow 287 * memused. 288 */ 289 if (memused > VFS_MOUNTARG_SIZE_MAX || 290 optlen > VFS_MOUNTARG_SIZE_MAX || 291 namelen > VFS_MOUNTARG_SIZE_MAX) { 292 error = EINVAL; 293 goto bad; 294 } 295 296 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 297 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 298 opt->value = NULL; 299 opt->len = 0; 300 opt->pos = i / 2; 301 opt->seen = 0; 302 303 /* 304 * Do this early, so jumps to "bad" will free the current 305 * option. 306 */ 307 TAILQ_INSERT_TAIL(opts, opt, link); 308 309 if (auio->uio_segflg == UIO_SYSSPACE) { 310 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 311 } else { 312 error = copyin(auio->uio_iov[i].iov_base, opt->name, 313 namelen); 314 if (error) 315 goto bad; 316 } 317 /* Ensure names are null-terminated strings. */ 318 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 319 error = EINVAL; 320 goto bad; 321 } 322 if (optlen != 0) { 323 opt->len = optlen; 324 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 325 if (auio->uio_segflg == UIO_SYSSPACE) { 326 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 327 optlen); 328 } else { 329 error = copyin(auio->uio_iov[i + 1].iov_base, 330 opt->value, optlen); 331 if (error) 332 goto bad; 333 } 334 } 335 } 336 vfs_sanitizeopts(opts); 337 *options = opts; 338 return (0); 339 bad: 340 vfs_freeopts(opts); 341 return (error); 342 } 343 344 /* 345 * Merge the old mount options with the new ones passed 346 * in the MNT_UPDATE case. 347 * 348 * XXX: This function will keep a "nofoo" option in the new 349 * options. E.g, if the option's canonical name is "foo", 350 * "nofoo" ends up in the mount point's active options. 351 */ 352 static void 353 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 354 { 355 struct vfsopt *opt, *new; 356 357 TAILQ_FOREACH(opt, oldopts, link) { 358 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 359 new->name = strdup(opt->name, M_MOUNT); 360 if (opt->len != 0) { 361 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 362 bcopy(opt->value, new->value, opt->len); 363 } else 364 new->value = NULL; 365 new->len = opt->len; 366 new->seen = opt->seen; 367 TAILQ_INSERT_HEAD(toopts, new, link); 368 } 369 vfs_sanitizeopts(toopts); 370 } 371 372 /* 373 * Mount a filesystem. 374 */ 375 #ifndef _SYS_SYSPROTO_H_ 376 struct nmount_args { 377 struct iovec *iovp; 378 unsigned int iovcnt; 379 int flags; 380 }; 381 #endif 382 int 383 sys_nmount(struct thread *td, struct nmount_args *uap) 384 { 385 struct uio *auio; 386 int error; 387 u_int iovcnt; 388 uint64_t flags; 389 390 /* 391 * Mount flags are now 64-bits. On 32-bit archtectures only 392 * 32-bits are passed in, but from here on everything handles 393 * 64-bit flags correctly. 394 */ 395 flags = uap->flags; 396 397 AUDIT_ARG_FFLAGS(flags); 398 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 399 uap->iovp, uap->iovcnt, flags); 400 401 /* 402 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 403 * userspace to set this flag, but we must filter it out if we want 404 * MNT_UPDATE on the root file system to work. 405 * MNT_ROOTFS should only be set by the kernel when mounting its 406 * root file system. 407 */ 408 flags &= ~MNT_ROOTFS; 409 410 iovcnt = uap->iovcnt; 411 /* 412 * Check that we have an even number of iovec's 413 * and that we have at least two options. 414 */ 415 if ((iovcnt & 1) || (iovcnt < 4)) { 416 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 417 uap->iovcnt); 418 return (EINVAL); 419 } 420 421 error = copyinuio(uap->iovp, iovcnt, &auio); 422 if (error) { 423 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 424 __func__, error); 425 return (error); 426 } 427 error = vfs_donmount(td, flags, auio); 428 429 free(auio, M_IOV); 430 return (error); 431 } 432 433 /* 434 * --------------------------------------------------------------------- 435 * Various utility functions 436 */ 437 438 void 439 vfs_ref(struct mount *mp) 440 { 441 442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 443 MNT_ILOCK(mp); 444 MNT_REF(mp); 445 MNT_IUNLOCK(mp); 446 } 447 448 void 449 vfs_rel(struct mount *mp) 450 { 451 452 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 453 MNT_ILOCK(mp); 454 MNT_REL(mp); 455 MNT_IUNLOCK(mp); 456 } 457 458 /* 459 * Allocate and initialize the mount point struct. 460 */ 461 struct mount * 462 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 463 struct ucred *cred) 464 { 465 struct mount *mp; 466 467 mp = uma_zalloc(mount_zone, M_WAITOK); 468 bzero(&mp->mnt_startzero, 469 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 470 TAILQ_INIT(&mp->mnt_nvnodelist); 471 mp->mnt_nvnodelistsize = 0; 472 TAILQ_INIT(&mp->mnt_activevnodelist); 473 mp->mnt_activevnodelistsize = 0; 474 TAILQ_INIT(&mp->mnt_tmpfreevnodelist); 475 mp->mnt_tmpfreevnodelistsize = 0; 476 mp->mnt_ref = 0; 477 (void) vfs_busy(mp, MBF_NOWAIT); 478 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 479 mp->mnt_op = vfsp->vfc_vfsops; 480 mp->mnt_vfc = vfsp; 481 mp->mnt_stat.f_type = vfsp->vfc_typenum; 482 mp->mnt_gen++; 483 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 484 mp->mnt_vnodecovered = vp; 485 mp->mnt_cred = crdup(cred); 486 mp->mnt_stat.f_owner = cred->cr_uid; 487 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 488 mp->mnt_iosize_max = DFLTPHYS; 489 #ifdef MAC 490 mac_mount_init(mp); 491 mac_mount_create(cred, mp); 492 #endif 493 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 494 TAILQ_INIT(&mp->mnt_uppers); 495 return (mp); 496 } 497 498 /* 499 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 500 */ 501 void 502 vfs_mount_destroy(struct mount *mp) 503 { 504 505 MNT_ILOCK(mp); 506 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 507 if (mp->mnt_kern_flag & MNTK_MWAIT) { 508 mp->mnt_kern_flag &= ~MNTK_MWAIT; 509 wakeup(mp); 510 } 511 while (mp->mnt_ref) 512 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 513 KASSERT(mp->mnt_ref == 0, 514 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 515 __FILE__, __LINE__)); 516 if (mp->mnt_writeopcount != 0) 517 panic("vfs_mount_destroy: nonzero writeopcount"); 518 if (mp->mnt_secondary_writes != 0) 519 panic("vfs_mount_destroy: nonzero secondary_writes"); 520 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 521 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 522 struct vnode *vp; 523 524 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 525 vn_printf(vp, "dangling vnode "); 526 panic("unmount: dangling vnode"); 527 } 528 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 529 if (mp->mnt_nvnodelistsize != 0) 530 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 531 if (mp->mnt_activevnodelistsize != 0) 532 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 533 if (mp->mnt_tmpfreevnodelistsize != 0) 534 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize"); 535 if (mp->mnt_lockref != 0) 536 panic("vfs_mount_destroy: nonzero lock refcount"); 537 MNT_IUNLOCK(mp); 538 if (mp->mnt_vnodecovered != NULL) 539 vrele(mp->mnt_vnodecovered); 540 #ifdef MAC 541 mac_mount_destroy(mp); 542 #endif 543 if (mp->mnt_opt != NULL) 544 vfs_freeopts(mp->mnt_opt); 545 crfree(mp->mnt_cred); 546 uma_zfree(mount_zone, mp); 547 } 548 549 int 550 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 551 { 552 struct vfsoptlist *optlist; 553 struct vfsopt *opt, *tmp_opt; 554 char *fstype, *fspath, *errmsg; 555 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 556 557 errmsg = fspath = NULL; 558 errmsg_len = fspathlen = 0; 559 errmsg_pos = -1; 560 561 error = vfs_buildopts(fsoptions, &optlist); 562 if (error) 563 return (error); 564 565 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 566 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 567 568 /* 569 * We need these two options before the others, 570 * and they are mandatory for any filesystem. 571 * Ensure they are NUL terminated as well. 572 */ 573 fstypelen = 0; 574 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 575 if (error || fstype[fstypelen - 1] != '\0') { 576 error = EINVAL; 577 if (errmsg != NULL) 578 strncpy(errmsg, "Invalid fstype", errmsg_len); 579 goto bail; 580 } 581 fspathlen = 0; 582 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 583 if (error || fspath[fspathlen - 1] != '\0') { 584 error = EINVAL; 585 if (errmsg != NULL) 586 strncpy(errmsg, "Invalid fspath", errmsg_len); 587 goto bail; 588 } 589 590 /* 591 * We need to see if we have the "update" option 592 * before we call vfs_domount(), since vfs_domount() has special 593 * logic based on MNT_UPDATE. This is very important 594 * when we want to update the root filesystem. 595 */ 596 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 597 if (strcmp(opt->name, "update") == 0) { 598 fsflags |= MNT_UPDATE; 599 vfs_freeopt(optlist, opt); 600 } 601 else if (strcmp(opt->name, "async") == 0) 602 fsflags |= MNT_ASYNC; 603 else if (strcmp(opt->name, "force") == 0) { 604 fsflags |= MNT_FORCE; 605 vfs_freeopt(optlist, opt); 606 } 607 else if (strcmp(opt->name, "reload") == 0) { 608 fsflags |= MNT_RELOAD; 609 vfs_freeopt(optlist, opt); 610 } 611 else if (strcmp(opt->name, "multilabel") == 0) 612 fsflags |= MNT_MULTILABEL; 613 else if (strcmp(opt->name, "noasync") == 0) 614 fsflags &= ~MNT_ASYNC; 615 else if (strcmp(opt->name, "noatime") == 0) 616 fsflags |= MNT_NOATIME; 617 else if (strcmp(opt->name, "atime") == 0) { 618 free(opt->name, M_MOUNT); 619 opt->name = strdup("nonoatime", M_MOUNT); 620 } 621 else if (strcmp(opt->name, "noclusterr") == 0) 622 fsflags |= MNT_NOCLUSTERR; 623 else if (strcmp(opt->name, "clusterr") == 0) { 624 free(opt->name, M_MOUNT); 625 opt->name = strdup("nonoclusterr", M_MOUNT); 626 } 627 else if (strcmp(opt->name, "noclusterw") == 0) 628 fsflags |= MNT_NOCLUSTERW; 629 else if (strcmp(opt->name, "clusterw") == 0) { 630 free(opt->name, M_MOUNT); 631 opt->name = strdup("nonoclusterw", M_MOUNT); 632 } 633 else if (strcmp(opt->name, "noexec") == 0) 634 fsflags |= MNT_NOEXEC; 635 else if (strcmp(opt->name, "exec") == 0) { 636 free(opt->name, M_MOUNT); 637 opt->name = strdup("nonoexec", M_MOUNT); 638 } 639 else if (strcmp(opt->name, "nosuid") == 0) 640 fsflags |= MNT_NOSUID; 641 else if (strcmp(opt->name, "suid") == 0) { 642 free(opt->name, M_MOUNT); 643 opt->name = strdup("nonosuid", M_MOUNT); 644 } 645 else if (strcmp(opt->name, "nosymfollow") == 0) 646 fsflags |= MNT_NOSYMFOLLOW; 647 else if (strcmp(opt->name, "symfollow") == 0) { 648 free(opt->name, M_MOUNT); 649 opt->name = strdup("nonosymfollow", M_MOUNT); 650 } 651 else if (strcmp(opt->name, "noro") == 0) 652 fsflags &= ~MNT_RDONLY; 653 else if (strcmp(opt->name, "rw") == 0) 654 fsflags &= ~MNT_RDONLY; 655 else if (strcmp(opt->name, "ro") == 0) 656 fsflags |= MNT_RDONLY; 657 else if (strcmp(opt->name, "rdonly") == 0) { 658 free(opt->name, M_MOUNT); 659 opt->name = strdup("ro", M_MOUNT); 660 fsflags |= MNT_RDONLY; 661 } 662 else if (strcmp(opt->name, "suiddir") == 0) 663 fsflags |= MNT_SUIDDIR; 664 else if (strcmp(opt->name, "sync") == 0) 665 fsflags |= MNT_SYNCHRONOUS; 666 else if (strcmp(opt->name, "union") == 0) 667 fsflags |= MNT_UNION; 668 else if (strcmp(opt->name, "automounted") == 0) { 669 fsflags |= MNT_AUTOMOUNTED; 670 vfs_freeopt(optlist, opt); 671 } 672 } 673 674 /* 675 * Be ultra-paranoid about making sure the type and fspath 676 * variables will fit in our mp buffers, including the 677 * terminating NUL. 678 */ 679 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 680 error = ENAMETOOLONG; 681 goto bail; 682 } 683 684 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 685 bail: 686 /* copyout the errmsg */ 687 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 688 && errmsg_len > 0 && errmsg != NULL) { 689 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 690 bcopy(errmsg, 691 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 692 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 693 } else { 694 copyout(errmsg, 695 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 696 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 697 } 698 } 699 700 if (optlist != NULL) 701 vfs_freeopts(optlist); 702 return (error); 703 } 704 705 /* 706 * Old mount API. 707 */ 708 #ifndef _SYS_SYSPROTO_H_ 709 struct mount_args { 710 char *type; 711 char *path; 712 int flags; 713 caddr_t data; 714 }; 715 #endif 716 /* ARGSUSED */ 717 int 718 sys_mount(struct thread *td, struct mount_args *uap) 719 { 720 char *fstype; 721 struct vfsconf *vfsp = NULL; 722 struct mntarg *ma = NULL; 723 uint64_t flags; 724 int error; 725 726 /* 727 * Mount flags are now 64-bits. On 32-bit architectures only 728 * 32-bits are passed in, but from here on everything handles 729 * 64-bit flags correctly. 730 */ 731 flags = uap->flags; 732 733 AUDIT_ARG_FFLAGS(flags); 734 735 /* 736 * Filter out MNT_ROOTFS. We do not want clients of mount() in 737 * userspace to set this flag, but we must filter it out if we want 738 * MNT_UPDATE on the root file system to work. 739 * MNT_ROOTFS should only be set by the kernel when mounting its 740 * root file system. 741 */ 742 flags &= ~MNT_ROOTFS; 743 744 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 745 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 746 if (error) { 747 free(fstype, M_TEMP); 748 return (error); 749 } 750 751 AUDIT_ARG_TEXT(fstype); 752 vfsp = vfs_byname_kld(fstype, td, &error); 753 free(fstype, M_TEMP); 754 if (vfsp == NULL) 755 return (ENOENT); 756 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 757 return (EOPNOTSUPP); 758 759 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 760 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 761 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 762 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 763 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 764 765 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 766 return (error); 767 } 768 769 /* 770 * vfs_domount_first(): first file system mount (not update) 771 */ 772 static int 773 vfs_domount_first( 774 struct thread *td, /* Calling thread. */ 775 struct vfsconf *vfsp, /* File system type. */ 776 char *fspath, /* Mount path. */ 777 struct vnode *vp, /* Vnode to be covered. */ 778 uint64_t fsflags, /* Flags common to all filesystems. */ 779 struct vfsoptlist **optlist /* Options local to the filesystem. */ 780 ) 781 { 782 struct vattr va; 783 struct mount *mp; 784 struct vnode *newdp; 785 int error; 786 787 ASSERT_VOP_ELOCKED(vp, __func__); 788 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 789 790 /* 791 * If the user is not root, ensure that they own the directory 792 * onto which we are attempting to mount. 793 */ 794 error = VOP_GETATTR(vp, &va, td->td_ucred); 795 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 796 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 797 if (error == 0) 798 error = vinvalbuf(vp, V_SAVE, 0, 0); 799 if (error == 0 && vp->v_type != VDIR) 800 error = ENOTDIR; 801 if (error == 0) { 802 VI_LOCK(vp); 803 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 804 vp->v_iflag |= VI_MOUNT; 805 else 806 error = EBUSY; 807 VI_UNLOCK(vp); 808 } 809 if (error != 0) { 810 vput(vp); 811 return (error); 812 } 813 VOP_UNLOCK(vp, 0); 814 815 /* Allocate and initialize the filesystem. */ 816 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 817 /* XXXMAC: pass to vfs_mount_alloc? */ 818 mp->mnt_optnew = *optlist; 819 /* Set the mount level flags. */ 820 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 821 822 /* 823 * Mount the filesystem. 824 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 825 * get. No freeing of cn_pnbuf. 826 */ 827 error = VFS_MOUNT(mp); 828 if (error != 0) { 829 vfs_unbusy(mp); 830 mp->mnt_vnodecovered = NULL; 831 vfs_mount_destroy(mp); 832 VI_LOCK(vp); 833 vp->v_iflag &= ~VI_MOUNT; 834 VI_UNLOCK(vp); 835 vrele(vp); 836 return (error); 837 } 838 839 if (mp->mnt_opt != NULL) 840 vfs_freeopts(mp->mnt_opt); 841 mp->mnt_opt = mp->mnt_optnew; 842 *optlist = NULL; 843 (void)VFS_STATFS(mp, &mp->mnt_stat); 844 845 /* 846 * Prevent external consumers of mount options from reading mnt_optnew. 847 */ 848 mp->mnt_optnew = NULL; 849 850 MNT_ILOCK(mp); 851 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 852 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 853 mp->mnt_kern_flag |= MNTK_ASYNC; 854 else 855 mp->mnt_kern_flag &= ~MNTK_ASYNC; 856 MNT_IUNLOCK(mp); 857 858 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 859 cache_purge(vp); 860 VI_LOCK(vp); 861 vp->v_iflag &= ~VI_MOUNT; 862 VI_UNLOCK(vp); 863 vp->v_mountedhere = mp; 864 /* Place the new filesystem at the end of the mount list. */ 865 mtx_lock(&mountlist_mtx); 866 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 867 mtx_unlock(&mountlist_mtx); 868 vfs_event_signal(NULL, VQ_MOUNT, 0); 869 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 870 panic("mount: lost mount"); 871 VOP_UNLOCK(vp, 0); 872 EVENTHANDLER_DIRECT_INVOKE(vfs_mounted, mp, newdp, td); 873 VOP_UNLOCK(newdp, 0); 874 mountcheckdirs(vp, newdp); 875 vrele(newdp); 876 if ((mp->mnt_flag & MNT_RDONLY) == 0) 877 vfs_allocate_syncvnode(mp); 878 vfs_unbusy(mp); 879 return (0); 880 } 881 882 /* 883 * vfs_domount_update(): update of mounted file system 884 */ 885 static int 886 vfs_domount_update( 887 struct thread *td, /* Calling thread. */ 888 struct vnode *vp, /* Mount point vnode. */ 889 uint64_t fsflags, /* Flags common to all filesystems. */ 890 struct vfsoptlist **optlist /* Options local to the filesystem. */ 891 ) 892 { 893 struct export_args export; 894 void *bufp; 895 struct mount *mp; 896 int error, export_error, len; 897 uint64_t flag; 898 899 ASSERT_VOP_ELOCKED(vp, __func__); 900 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 901 mp = vp->v_mount; 902 903 if ((vp->v_vflag & VV_ROOT) == 0) { 904 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 905 == 0) 906 error = EXDEV; 907 else 908 error = EINVAL; 909 vput(vp); 910 return (error); 911 } 912 913 /* 914 * We only allow the filesystem to be reloaded if it 915 * is currently mounted read-only. 916 */ 917 flag = mp->mnt_flag; 918 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 919 vput(vp); 920 return (EOPNOTSUPP); /* Needs translation */ 921 } 922 /* 923 * Only privileged root, or (if MNT_USER is set) the user that 924 * did the original mount is permitted to update it. 925 */ 926 error = vfs_suser(mp, td); 927 if (error != 0) { 928 vput(vp); 929 return (error); 930 } 931 if (vfs_busy(mp, MBF_NOWAIT)) { 932 vput(vp); 933 return (EBUSY); 934 } 935 VI_LOCK(vp); 936 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 937 VI_UNLOCK(vp); 938 vfs_unbusy(mp); 939 vput(vp); 940 return (EBUSY); 941 } 942 vp->v_iflag |= VI_MOUNT; 943 VI_UNLOCK(vp); 944 VOP_UNLOCK(vp, 0); 945 946 MNT_ILOCK(mp); 947 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 948 MNT_IUNLOCK(mp); 949 error = EBUSY; 950 goto end; 951 } 952 mp->mnt_flag &= ~MNT_UPDATEMASK; 953 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 954 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 955 if ((mp->mnt_flag & MNT_ASYNC) == 0) 956 mp->mnt_kern_flag &= ~MNTK_ASYNC; 957 MNT_IUNLOCK(mp); 958 mp->mnt_optnew = *optlist; 959 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 960 961 /* 962 * Mount the filesystem. 963 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 964 * get. No freeing of cn_pnbuf. 965 */ 966 error = VFS_MOUNT(mp); 967 968 export_error = 0; 969 /* Process the export option. */ 970 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 971 &len) == 0) { 972 /* Assume that there is only 1 ABI for each length. */ 973 switch (len) { 974 case (sizeof(struct oexport_args)): 975 bzero(&export, sizeof(export)); 976 /* FALLTHROUGH */ 977 case (sizeof(export)): 978 bcopy(bufp, &export, len); 979 export_error = vfs_export(mp, &export); 980 break; 981 default: 982 export_error = EINVAL; 983 break; 984 } 985 } 986 987 MNT_ILOCK(mp); 988 if (error == 0) { 989 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 990 MNT_SNAPSHOT); 991 } else { 992 /* 993 * If we fail, restore old mount flags. MNT_QUOTA is special, 994 * because it is not part of MNT_UPDATEMASK, but it could have 995 * changed in the meantime if quotactl(2) was called. 996 * All in all we want current value of MNT_QUOTA, not the old 997 * one. 998 */ 999 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 1000 } 1001 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1002 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1003 mp->mnt_kern_flag |= MNTK_ASYNC; 1004 else 1005 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1006 MNT_IUNLOCK(mp); 1007 1008 if (error != 0) 1009 goto end; 1010 1011 if (mp->mnt_opt != NULL) 1012 vfs_freeopts(mp->mnt_opt); 1013 mp->mnt_opt = mp->mnt_optnew; 1014 *optlist = NULL; 1015 (void)VFS_STATFS(mp, &mp->mnt_stat); 1016 /* 1017 * Prevent external consumers of mount options from reading 1018 * mnt_optnew. 1019 */ 1020 mp->mnt_optnew = NULL; 1021 1022 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1023 vfs_allocate_syncvnode(mp); 1024 else 1025 vfs_deallocate_syncvnode(mp); 1026 end: 1027 vfs_unbusy(mp); 1028 VI_LOCK(vp); 1029 vp->v_iflag &= ~VI_MOUNT; 1030 VI_UNLOCK(vp); 1031 vrele(vp); 1032 return (error != 0 ? error : export_error); 1033 } 1034 1035 /* 1036 * vfs_domount(): actually attempt a filesystem mount. 1037 */ 1038 static int 1039 vfs_domount( 1040 struct thread *td, /* Calling thread. */ 1041 const char *fstype, /* Filesystem type. */ 1042 char *fspath, /* Mount path. */ 1043 uint64_t fsflags, /* Flags common to all filesystems. */ 1044 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1045 ) 1046 { 1047 struct vfsconf *vfsp; 1048 struct nameidata nd; 1049 struct vnode *vp; 1050 char *pathbuf; 1051 int error; 1052 1053 /* 1054 * Be ultra-paranoid about making sure the type and fspath 1055 * variables will fit in our mp buffers, including the 1056 * terminating NUL. 1057 */ 1058 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1059 return (ENAMETOOLONG); 1060 1061 if (jailed(td->td_ucred) || usermount == 0) { 1062 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1063 return (error); 1064 } 1065 1066 /* 1067 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1068 */ 1069 if (fsflags & MNT_EXPORTED) { 1070 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1071 if (error) 1072 return (error); 1073 } 1074 if (fsflags & MNT_SUIDDIR) { 1075 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1076 if (error) 1077 return (error); 1078 } 1079 /* 1080 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1081 */ 1082 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1083 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1084 fsflags |= MNT_NOSUID | MNT_USER; 1085 } 1086 1087 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1088 vfsp = NULL; 1089 if ((fsflags & MNT_UPDATE) == 0) { 1090 /* Don't try to load KLDs if we're mounting the root. */ 1091 if (fsflags & MNT_ROOTFS) 1092 vfsp = vfs_byname(fstype); 1093 else 1094 vfsp = vfs_byname_kld(fstype, td, &error); 1095 if (vfsp == NULL) 1096 return (ENODEV); 1097 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1098 return (EPERM); 1099 } 1100 1101 /* 1102 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1103 */ 1104 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1105 UIO_SYSSPACE, fspath, td); 1106 error = namei(&nd); 1107 if (error != 0) 1108 return (error); 1109 NDFREE(&nd, NDF_ONLY_PNBUF); 1110 vp = nd.ni_vp; 1111 if ((fsflags & MNT_UPDATE) == 0) { 1112 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1113 strcpy(pathbuf, fspath); 1114 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1115 /* debug.disablefullpath == 1 results in ENODEV */ 1116 if (error == 0 || error == ENODEV) { 1117 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1118 fsflags, optlist); 1119 } 1120 free(pathbuf, M_TEMP); 1121 } else 1122 error = vfs_domount_update(td, vp, fsflags, optlist); 1123 1124 return (error); 1125 } 1126 1127 /* 1128 * Unmount a filesystem. 1129 * 1130 * Note: unmount takes a path to the vnode mounted on as argument, not 1131 * special file (as before). 1132 */ 1133 #ifndef _SYS_SYSPROTO_H_ 1134 struct unmount_args { 1135 char *path; 1136 int flags; 1137 }; 1138 #endif 1139 /* ARGSUSED */ 1140 int 1141 sys_unmount(struct thread *td, struct unmount_args *uap) 1142 { 1143 struct nameidata nd; 1144 struct mount *mp; 1145 char *pathbuf; 1146 int error, id0, id1; 1147 1148 AUDIT_ARG_VALUE(uap->flags); 1149 if (jailed(td->td_ucred) || usermount == 0) { 1150 error = priv_check(td, PRIV_VFS_UNMOUNT); 1151 if (error) 1152 return (error); 1153 } 1154 1155 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1156 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1157 if (error) { 1158 free(pathbuf, M_TEMP); 1159 return (error); 1160 } 1161 if (uap->flags & MNT_BYFSID) { 1162 AUDIT_ARG_TEXT(pathbuf); 1163 /* Decode the filesystem ID. */ 1164 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1165 free(pathbuf, M_TEMP); 1166 return (EINVAL); 1167 } 1168 1169 mtx_lock(&mountlist_mtx); 1170 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1171 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1172 mp->mnt_stat.f_fsid.val[1] == id1) { 1173 vfs_ref(mp); 1174 break; 1175 } 1176 } 1177 mtx_unlock(&mountlist_mtx); 1178 } else { 1179 /* 1180 * Try to find global path for path argument. 1181 */ 1182 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1183 UIO_SYSSPACE, pathbuf, td); 1184 if (namei(&nd) == 0) { 1185 NDFREE(&nd, NDF_ONLY_PNBUF); 1186 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1187 MNAMELEN); 1188 if (error == 0 || error == ENODEV) 1189 vput(nd.ni_vp); 1190 } 1191 mtx_lock(&mountlist_mtx); 1192 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1193 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1194 vfs_ref(mp); 1195 break; 1196 } 1197 } 1198 mtx_unlock(&mountlist_mtx); 1199 } 1200 free(pathbuf, M_TEMP); 1201 if (mp == NULL) { 1202 /* 1203 * Previously we returned ENOENT for a nonexistent path and 1204 * EINVAL for a non-mountpoint. We cannot tell these apart 1205 * now, so in the !MNT_BYFSID case return the more likely 1206 * EINVAL for compatibility. 1207 */ 1208 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1209 } 1210 1211 /* 1212 * Don't allow unmounting the root filesystem. 1213 */ 1214 if (mp->mnt_flag & MNT_ROOTFS) { 1215 vfs_rel(mp); 1216 return (EINVAL); 1217 } 1218 error = dounmount(mp, uap->flags, td); 1219 return (error); 1220 } 1221 1222 /* 1223 * Return error if any of the vnodes, ignoring the root vnode 1224 * and the syncer vnode, have non-zero usecount. 1225 * 1226 * This function is purely advisory - it can return false positives 1227 * and negatives. 1228 */ 1229 static int 1230 vfs_check_usecounts(struct mount *mp) 1231 { 1232 struct vnode *vp, *mvp; 1233 1234 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1235 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1236 vp->v_usecount != 0) { 1237 VI_UNLOCK(vp); 1238 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1239 return (EBUSY); 1240 } 1241 VI_UNLOCK(vp); 1242 } 1243 1244 return (0); 1245 } 1246 1247 static void 1248 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags) 1249 { 1250 1251 mtx_assert(MNT_MTX(mp), MA_OWNED); 1252 mp->mnt_kern_flag &= ~mntkflags; 1253 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) { 1254 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1255 wakeup(mp); 1256 } 1257 MNT_IUNLOCK(mp); 1258 if (coveredvp != NULL) { 1259 VOP_UNLOCK(coveredvp, 0); 1260 vdrop(coveredvp); 1261 } 1262 vn_finished_write(mp); 1263 } 1264 1265 /* 1266 * Do the actual filesystem unmount. 1267 */ 1268 int 1269 dounmount(struct mount *mp, int flags, struct thread *td) 1270 { 1271 struct vnode *coveredvp; 1272 int error; 1273 uint64_t async_flag; 1274 int mnt_gen_r; 1275 1276 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1277 mnt_gen_r = mp->mnt_gen; 1278 VI_LOCK(coveredvp); 1279 vholdl(coveredvp); 1280 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1281 /* 1282 * Check for mp being unmounted while waiting for the 1283 * covered vnode lock. 1284 */ 1285 if (coveredvp->v_mountedhere != mp || 1286 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1287 VOP_UNLOCK(coveredvp, 0); 1288 vdrop(coveredvp); 1289 vfs_rel(mp); 1290 return (EBUSY); 1291 } 1292 } 1293 1294 /* 1295 * Only privileged root, or (if MNT_USER is set) the user that did the 1296 * original mount is permitted to unmount this filesystem. 1297 */ 1298 error = vfs_suser(mp, td); 1299 if (error != 0) { 1300 if (coveredvp != NULL) { 1301 VOP_UNLOCK(coveredvp, 0); 1302 vdrop(coveredvp); 1303 } 1304 vfs_rel(mp); 1305 return (error); 1306 } 1307 1308 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1309 MNT_ILOCK(mp); 1310 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1311 (mp->mnt_flag & MNT_UPDATE) != 0 || 1312 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1313 dounmount_cleanup(mp, coveredvp, 0); 1314 return (EBUSY); 1315 } 1316 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1317 if (flags & MNT_NONBUSY) { 1318 MNT_IUNLOCK(mp); 1319 error = vfs_check_usecounts(mp); 1320 MNT_ILOCK(mp); 1321 if (error != 0) { 1322 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT | 1323 MNTK_NOINSMNTQ); 1324 return (error); 1325 } 1326 } 1327 /* Allow filesystems to detect that a forced unmount is in progress. */ 1328 if (flags & MNT_FORCE) { 1329 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1330 MNT_IUNLOCK(mp); 1331 /* 1332 * Must be done after setting MNTK_UNMOUNTF and before 1333 * waiting for mnt_lockref to become 0. 1334 */ 1335 VFS_PURGE(mp); 1336 MNT_ILOCK(mp); 1337 } 1338 error = 0; 1339 if (mp->mnt_lockref) { 1340 mp->mnt_kern_flag |= MNTK_DRAINING; 1341 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1342 "mount drain", 0); 1343 } 1344 MNT_IUNLOCK(mp); 1345 KASSERT(mp->mnt_lockref == 0, 1346 ("%s: invalid lock refcount in the drain path @ %s:%d", 1347 __func__, __FILE__, __LINE__)); 1348 KASSERT(error == 0, 1349 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1350 __func__, __FILE__, __LINE__)); 1351 1352 if (mp->mnt_flag & MNT_EXPUBLIC) 1353 vfs_setpublicfs(NULL, NULL, NULL); 1354 1355 /* 1356 * From now, we can claim that the use reference on the 1357 * coveredvp is ours, and the ref can be released only by 1358 * successfull unmount by us, or left for later unmount 1359 * attempt. The previously acquired hold reference is no 1360 * longer needed to protect the vnode from reuse. 1361 */ 1362 if (coveredvp != NULL) 1363 vdrop(coveredvp); 1364 1365 vfs_msync(mp, MNT_WAIT); 1366 MNT_ILOCK(mp); 1367 async_flag = mp->mnt_flag & MNT_ASYNC; 1368 mp->mnt_flag &= ~MNT_ASYNC; 1369 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1370 MNT_IUNLOCK(mp); 1371 cache_purgevfs(mp, false); /* remove cache entries for this file sys */ 1372 vfs_deallocate_syncvnode(mp); 1373 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1374 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1375 error = VFS_UNMOUNT(mp, flags); 1376 vn_finished_write(mp); 1377 /* 1378 * If we failed to flush the dirty blocks for this mount point, 1379 * undo all the cdir/rdir and rootvnode changes we made above. 1380 * Unless we failed to do so because the device is reporting that 1381 * it doesn't exist anymore. 1382 */ 1383 if (error && error != ENXIO) { 1384 MNT_ILOCK(mp); 1385 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1386 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1387 MNT_IUNLOCK(mp); 1388 vfs_allocate_syncvnode(mp); 1389 MNT_ILOCK(mp); 1390 } 1391 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1392 mp->mnt_flag |= async_flag; 1393 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1394 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1395 mp->mnt_kern_flag |= MNTK_ASYNC; 1396 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1397 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1398 wakeup(mp); 1399 } 1400 MNT_IUNLOCK(mp); 1401 if (coveredvp) 1402 VOP_UNLOCK(coveredvp, 0); 1403 return (error); 1404 } 1405 mtx_lock(&mountlist_mtx); 1406 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1407 mtx_unlock(&mountlist_mtx); 1408 EVENTHANDLER_DIRECT_INVOKE(vfs_unmounted, mp, td); 1409 if (coveredvp != NULL) { 1410 coveredvp->v_mountedhere = NULL; 1411 VOP_UNLOCK(coveredvp, 0); 1412 } 1413 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1414 if (rootvnode != NULL && mp == rootvnode->v_mount) { 1415 vrele(rootvnode); 1416 rootvnode = NULL; 1417 } 1418 if (mp == rootdevmp) 1419 rootdevmp = NULL; 1420 vfs_mount_destroy(mp); 1421 return (0); 1422 } 1423 1424 /* 1425 * Report errors during filesystem mounting. 1426 */ 1427 void 1428 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1429 { 1430 struct vfsoptlist *moptlist = mp->mnt_optnew; 1431 va_list ap; 1432 int error, len; 1433 char *errmsg; 1434 1435 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1436 if (error || errmsg == NULL || len <= 0) 1437 return; 1438 1439 va_start(ap, fmt); 1440 vsnprintf(errmsg, (size_t)len, fmt, ap); 1441 va_end(ap); 1442 } 1443 1444 void 1445 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1446 { 1447 va_list ap; 1448 int error, len; 1449 char *errmsg; 1450 1451 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1452 if (error || errmsg == NULL || len <= 0) 1453 return; 1454 1455 va_start(ap, fmt); 1456 vsnprintf(errmsg, (size_t)len, fmt, ap); 1457 va_end(ap); 1458 } 1459 1460 /* 1461 * --------------------------------------------------------------------- 1462 * Functions for querying mount options/arguments from filesystems. 1463 */ 1464 1465 /* 1466 * Check that no unknown options are given 1467 */ 1468 int 1469 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1470 { 1471 struct vfsopt *opt; 1472 char errmsg[255]; 1473 const char **t, *p, *q; 1474 int ret = 0; 1475 1476 TAILQ_FOREACH(opt, opts, link) { 1477 p = opt->name; 1478 q = NULL; 1479 if (p[0] == 'n' && p[1] == 'o') 1480 q = p + 2; 1481 for(t = global_opts; *t != NULL; t++) { 1482 if (strcmp(*t, p) == 0) 1483 break; 1484 if (q != NULL) { 1485 if (strcmp(*t, q) == 0) 1486 break; 1487 } 1488 } 1489 if (*t != NULL) 1490 continue; 1491 for(t = legal; *t != NULL; t++) { 1492 if (strcmp(*t, p) == 0) 1493 break; 1494 if (q != NULL) { 1495 if (strcmp(*t, q) == 0) 1496 break; 1497 } 1498 } 1499 if (*t != NULL) 1500 continue; 1501 snprintf(errmsg, sizeof(errmsg), 1502 "mount option <%s> is unknown", p); 1503 ret = EINVAL; 1504 } 1505 if (ret != 0) { 1506 TAILQ_FOREACH(opt, opts, link) { 1507 if (strcmp(opt->name, "errmsg") == 0) { 1508 strncpy((char *)opt->value, errmsg, opt->len); 1509 break; 1510 } 1511 } 1512 if (opt == NULL) 1513 printf("%s\n", errmsg); 1514 } 1515 return (ret); 1516 } 1517 1518 /* 1519 * Get a mount option by its name. 1520 * 1521 * Return 0 if the option was found, ENOENT otherwise. 1522 * If len is non-NULL it will be filled with the length 1523 * of the option. If buf is non-NULL, it will be filled 1524 * with the address of the option. 1525 */ 1526 int 1527 vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len) 1528 { 1529 struct vfsopt *opt; 1530 1531 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1532 1533 TAILQ_FOREACH(opt, opts, link) { 1534 if (strcmp(name, opt->name) == 0) { 1535 opt->seen = 1; 1536 if (len != NULL) 1537 *len = opt->len; 1538 if (buf != NULL) 1539 *buf = opt->value; 1540 return (0); 1541 } 1542 } 1543 return (ENOENT); 1544 } 1545 1546 int 1547 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1548 { 1549 struct vfsopt *opt; 1550 1551 if (opts == NULL) 1552 return (-1); 1553 1554 TAILQ_FOREACH(opt, opts, link) { 1555 if (strcmp(name, opt->name) == 0) { 1556 opt->seen = 1; 1557 return (opt->pos); 1558 } 1559 } 1560 return (-1); 1561 } 1562 1563 int 1564 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1565 { 1566 char *opt_value, *vtp; 1567 quad_t iv; 1568 int error, opt_len; 1569 1570 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1571 if (error != 0) 1572 return (error); 1573 if (opt_len == 0 || opt_value == NULL) 1574 return (EINVAL); 1575 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1576 return (EINVAL); 1577 iv = strtoq(opt_value, &vtp, 0); 1578 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1579 return (EINVAL); 1580 if (iv < 0) 1581 return (EINVAL); 1582 switch (vtp[0]) { 1583 case 't': 1584 case 'T': 1585 iv *= 1024; 1586 case 'g': 1587 case 'G': 1588 iv *= 1024; 1589 case 'm': 1590 case 'M': 1591 iv *= 1024; 1592 case 'k': 1593 case 'K': 1594 iv *= 1024; 1595 case '\0': 1596 break; 1597 default: 1598 return (EINVAL); 1599 } 1600 *value = iv; 1601 1602 return (0); 1603 } 1604 1605 char * 1606 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1607 { 1608 struct vfsopt *opt; 1609 1610 *error = 0; 1611 TAILQ_FOREACH(opt, opts, link) { 1612 if (strcmp(name, opt->name) != 0) 1613 continue; 1614 opt->seen = 1; 1615 if (opt->len == 0 || 1616 ((char *)opt->value)[opt->len - 1] != '\0') { 1617 *error = EINVAL; 1618 return (NULL); 1619 } 1620 return (opt->value); 1621 } 1622 *error = ENOENT; 1623 return (NULL); 1624 } 1625 1626 int 1627 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1628 uint64_t val) 1629 { 1630 struct vfsopt *opt; 1631 1632 TAILQ_FOREACH(opt, opts, link) { 1633 if (strcmp(name, opt->name) == 0) { 1634 opt->seen = 1; 1635 if (w != NULL) 1636 *w |= val; 1637 return (1); 1638 } 1639 } 1640 if (w != NULL) 1641 *w &= ~val; 1642 return (0); 1643 } 1644 1645 int 1646 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1647 { 1648 va_list ap; 1649 struct vfsopt *opt; 1650 int ret; 1651 1652 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1653 1654 TAILQ_FOREACH(opt, opts, link) { 1655 if (strcmp(name, opt->name) != 0) 1656 continue; 1657 opt->seen = 1; 1658 if (opt->len == 0 || opt->value == NULL) 1659 return (0); 1660 if (((char *)opt->value)[opt->len - 1] != '\0') 1661 return (0); 1662 va_start(ap, fmt); 1663 ret = vsscanf(opt->value, fmt, ap); 1664 va_end(ap); 1665 return (ret); 1666 } 1667 return (0); 1668 } 1669 1670 int 1671 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1672 { 1673 struct vfsopt *opt; 1674 1675 TAILQ_FOREACH(opt, opts, link) { 1676 if (strcmp(name, opt->name) != 0) 1677 continue; 1678 opt->seen = 1; 1679 if (opt->value == NULL) 1680 opt->len = len; 1681 else { 1682 if (opt->len != len) 1683 return (EINVAL); 1684 bcopy(value, opt->value, len); 1685 } 1686 return (0); 1687 } 1688 return (ENOENT); 1689 } 1690 1691 int 1692 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1693 { 1694 struct vfsopt *opt; 1695 1696 TAILQ_FOREACH(opt, opts, link) { 1697 if (strcmp(name, opt->name) != 0) 1698 continue; 1699 opt->seen = 1; 1700 if (opt->value == NULL) 1701 opt->len = len; 1702 else { 1703 if (opt->len < len) 1704 return (EINVAL); 1705 opt->len = len; 1706 bcopy(value, opt->value, len); 1707 } 1708 return (0); 1709 } 1710 return (ENOENT); 1711 } 1712 1713 int 1714 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1715 { 1716 struct vfsopt *opt; 1717 1718 TAILQ_FOREACH(opt, opts, link) { 1719 if (strcmp(name, opt->name) != 0) 1720 continue; 1721 opt->seen = 1; 1722 if (opt->value == NULL) 1723 opt->len = strlen(value) + 1; 1724 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1725 return (EINVAL); 1726 return (0); 1727 } 1728 return (ENOENT); 1729 } 1730 1731 /* 1732 * Find and copy a mount option. 1733 * 1734 * The size of the buffer has to be specified 1735 * in len, if it is not the same length as the 1736 * mount option, EINVAL is returned. 1737 * Returns ENOENT if the option is not found. 1738 */ 1739 int 1740 vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len) 1741 { 1742 struct vfsopt *opt; 1743 1744 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1745 1746 TAILQ_FOREACH(opt, opts, link) { 1747 if (strcmp(name, opt->name) == 0) { 1748 opt->seen = 1; 1749 if (len != opt->len) 1750 return (EINVAL); 1751 bcopy(opt->value, dest, opt->len); 1752 return (0); 1753 } 1754 } 1755 return (ENOENT); 1756 } 1757 1758 int 1759 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1760 { 1761 int error; 1762 1763 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1764 if (sbp != &mp->mnt_stat) 1765 *sbp = mp->mnt_stat; 1766 return (error); 1767 } 1768 1769 void 1770 vfs_mountedfrom(struct mount *mp, const char *from) 1771 { 1772 1773 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1774 strlcpy(mp->mnt_stat.f_mntfromname, from, 1775 sizeof mp->mnt_stat.f_mntfromname); 1776 } 1777 1778 /* 1779 * --------------------------------------------------------------------- 1780 * This is the api for building mount args and mounting filesystems from 1781 * inside the kernel. 1782 * 1783 * The API works by accumulation of individual args. First error is 1784 * latched. 1785 * 1786 * XXX: should be documented in new manpage kernel_mount(9) 1787 */ 1788 1789 /* A memory allocation which must be freed when we are done */ 1790 struct mntaarg { 1791 SLIST_ENTRY(mntaarg) next; 1792 }; 1793 1794 /* The header for the mount arguments */ 1795 struct mntarg { 1796 struct iovec *v; 1797 int len; 1798 int error; 1799 SLIST_HEAD(, mntaarg) list; 1800 }; 1801 1802 /* 1803 * Add a boolean argument. 1804 * 1805 * flag is the boolean value. 1806 * name must start with "no". 1807 */ 1808 struct mntarg * 1809 mount_argb(struct mntarg *ma, int flag, const char *name) 1810 { 1811 1812 KASSERT(name[0] == 'n' && name[1] == 'o', 1813 ("mount_argb(...,%s): name must start with 'no'", name)); 1814 1815 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1816 } 1817 1818 /* 1819 * Add an argument printf style 1820 */ 1821 struct mntarg * 1822 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1823 { 1824 va_list ap; 1825 struct mntaarg *maa; 1826 struct sbuf *sb; 1827 int len; 1828 1829 if (ma == NULL) { 1830 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1831 SLIST_INIT(&ma->list); 1832 } 1833 if (ma->error) 1834 return (ma); 1835 1836 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1837 M_MOUNT, M_WAITOK); 1838 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1839 ma->v[ma->len].iov_len = strlen(name) + 1; 1840 ma->len++; 1841 1842 sb = sbuf_new_auto(); 1843 va_start(ap, fmt); 1844 sbuf_vprintf(sb, fmt, ap); 1845 va_end(ap); 1846 sbuf_finish(sb); 1847 len = sbuf_len(sb) + 1; 1848 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1849 SLIST_INSERT_HEAD(&ma->list, maa, next); 1850 bcopy(sbuf_data(sb), maa + 1, len); 1851 sbuf_delete(sb); 1852 1853 ma->v[ma->len].iov_base = maa + 1; 1854 ma->v[ma->len].iov_len = len; 1855 ma->len++; 1856 1857 return (ma); 1858 } 1859 1860 /* 1861 * Add an argument which is a userland string. 1862 */ 1863 struct mntarg * 1864 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1865 { 1866 struct mntaarg *maa; 1867 char *tbuf; 1868 1869 if (val == NULL) 1870 return (ma); 1871 if (ma == NULL) { 1872 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1873 SLIST_INIT(&ma->list); 1874 } 1875 if (ma->error) 1876 return (ma); 1877 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1878 SLIST_INSERT_HEAD(&ma->list, maa, next); 1879 tbuf = (void *)(maa + 1); 1880 ma->error = copyinstr(val, tbuf, len, NULL); 1881 return (mount_arg(ma, name, tbuf, -1)); 1882 } 1883 1884 /* 1885 * Plain argument. 1886 * 1887 * If length is -1, treat value as a C string. 1888 */ 1889 struct mntarg * 1890 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1891 { 1892 1893 if (ma == NULL) { 1894 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1895 SLIST_INIT(&ma->list); 1896 } 1897 if (ma->error) 1898 return (ma); 1899 1900 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1901 M_MOUNT, M_WAITOK); 1902 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1903 ma->v[ma->len].iov_len = strlen(name) + 1; 1904 ma->len++; 1905 1906 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1907 if (len < 0) 1908 ma->v[ma->len].iov_len = strlen(val) + 1; 1909 else 1910 ma->v[ma->len].iov_len = len; 1911 ma->len++; 1912 return (ma); 1913 } 1914 1915 /* 1916 * Free a mntarg structure 1917 */ 1918 static void 1919 free_mntarg(struct mntarg *ma) 1920 { 1921 struct mntaarg *maa; 1922 1923 while (!SLIST_EMPTY(&ma->list)) { 1924 maa = SLIST_FIRST(&ma->list); 1925 SLIST_REMOVE_HEAD(&ma->list, next); 1926 free(maa, M_MOUNT); 1927 } 1928 free(ma->v, M_MOUNT); 1929 free(ma, M_MOUNT); 1930 } 1931 1932 /* 1933 * Mount a filesystem 1934 */ 1935 int 1936 kernel_mount(struct mntarg *ma, uint64_t flags) 1937 { 1938 struct uio auio; 1939 int error; 1940 1941 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1942 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1943 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1944 1945 auio.uio_iov = ma->v; 1946 auio.uio_iovcnt = ma->len; 1947 auio.uio_segflg = UIO_SYSSPACE; 1948 1949 error = ma->error; 1950 if (!error) 1951 error = vfs_donmount(curthread, flags, &auio); 1952 free_mntarg(ma); 1953 return (error); 1954 } 1955 1956 /* 1957 * A printflike function to mount a filesystem. 1958 */ 1959 int 1960 kernel_vmount(int flags, ...) 1961 { 1962 struct mntarg *ma = NULL; 1963 va_list ap; 1964 const char *cp; 1965 const void *vp; 1966 int error; 1967 1968 va_start(ap, flags); 1969 for (;;) { 1970 cp = va_arg(ap, const char *); 1971 if (cp == NULL) 1972 break; 1973 vp = va_arg(ap, const void *); 1974 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1975 } 1976 va_end(ap); 1977 1978 error = kernel_mount(ma, flags); 1979 return (error); 1980 } 1981 1982 void 1983 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1984 { 1985 1986 bcopy(oexp, exp, sizeof(*oexp)); 1987 exp->ex_numsecflavors = 0; 1988 } 1989