1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/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/syscallsubr.h> 55 #include <sys/sysproto.h> 56 #include <sys/sx.h> 57 #include <sys/sysctl.h> 58 #include <sys/sysent.h> 59 #include <sys/systm.h> 60 #include <sys/vnode.h> 61 #include <vm/uma.h> 62 63 #include <geom/geom.h> 64 65 #include <machine/stdarg.h> 66 67 #include <security/audit/audit.h> 68 #include <security/mac/mac_framework.h> 69 70 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 71 72 static int vfs_domount(struct thread *td, const char *fstype, 73 char *fspath, int fsflags, void *fsdata); 74 static void free_mntarg(struct mntarg *ma); 75 76 static int usermount = 0; 77 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 78 "Unprivileged users may mount and unmount file systems"); 79 80 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 81 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 82 static uma_zone_t mount_zone; 83 84 /* List of mounted filesystems. */ 85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87 /* For any iteration/modification of mountlist */ 88 struct mtx mountlist_mtx; 89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91 /* 92 * Global opts, taken by all filesystems 93 */ 94 static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103 }; 104 105 static int 106 mount_init(void *mem, int size, int flags) 107 { 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 113 return (0); 114 } 115 116 static void 117 mount_fini(void *mem, int size) 118 { 119 struct mount *mp; 120 121 mp = (struct mount *)mem; 122 lockdestroy(&mp->mnt_explock); 123 mtx_destroy(&mp->mnt_mtx); 124 } 125 126 static void 127 vfs_mount_init(void *dummy __unused) 128 { 129 130 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 131 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 132 } 133 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 134 135 /* 136 * --------------------------------------------------------------------- 137 * Functions for building and sanitizing the mount options 138 */ 139 140 /* Remove one mount option. */ 141 static void 142 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 143 { 144 145 TAILQ_REMOVE(opts, opt, link); 146 free(opt->name, M_MOUNT); 147 if (opt->value != NULL) 148 free(opt->value, M_MOUNT); 149 free(opt, M_MOUNT); 150 } 151 152 /* Release all resources related to the mount options. */ 153 void 154 vfs_freeopts(struct vfsoptlist *opts) 155 { 156 struct vfsopt *opt; 157 158 while (!TAILQ_EMPTY(opts)) { 159 opt = TAILQ_FIRST(opts); 160 vfs_freeopt(opts, opt); 161 } 162 free(opts, M_MOUNT); 163 } 164 165 void 166 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 167 { 168 struct vfsopt *opt, *temp; 169 170 if (opts == NULL) 171 return; 172 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 173 if (strcmp(opt->name, name) == 0) 174 vfs_freeopt(opts, opt); 175 } 176 } 177 178 /* 179 * Check if options are equal (with or without the "no" prefix). 180 */ 181 static int 182 vfs_equalopts(const char *opt1, const char *opt2) 183 { 184 char *p; 185 186 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 187 if (strcmp(opt1, opt2) == 0) 188 return (1); 189 /* "noopt" vs. "opt" */ 190 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 191 return (1); 192 /* "opt" vs. "noopt" */ 193 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 194 return (1); 195 while ((p = strchr(opt1, '.')) != NULL && 196 !strncmp(opt1, opt2, ++p - opt1)) { 197 opt2 += p - opt1; 198 opt1 = p; 199 /* "foo.noopt" vs. "foo.opt" */ 200 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 201 return (1); 202 /* "foo.opt" vs. "foo.noopt" */ 203 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 204 return (1); 205 } 206 return (0); 207 } 208 209 /* 210 * If a mount option is specified several times, 211 * (with or without the "no" prefix) only keep 212 * the last occurence of it. 213 */ 214 static void 215 vfs_sanitizeopts(struct vfsoptlist *opts) 216 { 217 struct vfsopt *opt, *opt2, *tmp; 218 219 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 220 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 221 while (opt2 != NULL) { 222 if (vfs_equalopts(opt->name, opt2->name)) { 223 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 224 vfs_freeopt(opts, opt2); 225 opt2 = tmp; 226 } else { 227 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 228 } 229 } 230 } 231 } 232 233 /* 234 * Build a linked list of mount options from a struct uio. 235 */ 236 int 237 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 238 { 239 struct vfsoptlist *opts; 240 struct vfsopt *opt; 241 size_t memused, namelen, optlen; 242 unsigned int i, iovcnt; 243 int error; 244 245 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 246 TAILQ_INIT(opts); 247 memused = 0; 248 iovcnt = auio->uio_iovcnt; 249 for (i = 0; i < iovcnt; i += 2) { 250 namelen = auio->uio_iov[i].iov_len; 251 optlen = auio->uio_iov[i + 1].iov_len; 252 memused += sizeof(struct vfsopt) + optlen + namelen; 253 /* 254 * Avoid consuming too much memory, and attempts to overflow 255 * memused. 256 */ 257 if (memused > VFS_MOUNTARG_SIZE_MAX || 258 optlen > VFS_MOUNTARG_SIZE_MAX || 259 namelen > VFS_MOUNTARG_SIZE_MAX) { 260 error = EINVAL; 261 goto bad; 262 } 263 264 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 265 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 266 opt->value = NULL; 267 opt->len = 0; 268 opt->pos = i / 2; 269 opt->seen = 0; 270 271 /* 272 * Do this early, so jumps to "bad" will free the current 273 * option. 274 */ 275 TAILQ_INSERT_TAIL(opts, opt, link); 276 277 if (auio->uio_segflg == UIO_SYSSPACE) { 278 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 279 } else { 280 error = copyin(auio->uio_iov[i].iov_base, opt->name, 281 namelen); 282 if (error) 283 goto bad; 284 } 285 /* Ensure names are null-terminated strings. */ 286 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 287 error = EINVAL; 288 goto bad; 289 } 290 if (optlen != 0) { 291 opt->len = optlen; 292 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 293 if (auio->uio_segflg == UIO_SYSSPACE) { 294 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 295 optlen); 296 } else { 297 error = copyin(auio->uio_iov[i + 1].iov_base, 298 opt->value, optlen); 299 if (error) 300 goto bad; 301 } 302 } 303 } 304 vfs_sanitizeopts(opts); 305 *options = opts; 306 return (0); 307 bad: 308 vfs_freeopts(opts); 309 return (error); 310 } 311 312 /* 313 * Merge the old mount options with the new ones passed 314 * in the MNT_UPDATE case. 315 * 316 * XXX This function will keep a "nofoo" option in the 317 * new options if there is no matching "foo" option 318 * to be cancelled in the old options. This is a bug 319 * if the option's canonical name is "foo". E.g., "noro" 320 * shouldn't end up in the mount point's active options, 321 * but it can. 322 */ 323 static void 324 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 325 { 326 struct vfsopt *opt, *opt2, *new; 327 328 TAILQ_FOREACH(opt, opts, link) { 329 /* 330 * Check that this option hasn't been redefined 331 * nor cancelled with a "no" mount option. 332 */ 333 opt2 = TAILQ_FIRST(toopts); 334 while (opt2 != NULL) { 335 if (strcmp(opt2->name, opt->name) == 0) 336 goto next; 337 if (strncmp(opt2->name, "no", 2) == 0 && 338 strcmp(opt2->name + 2, opt->name) == 0) { 339 vfs_freeopt(toopts, opt2); 340 goto next; 341 } 342 opt2 = TAILQ_NEXT(opt2, link); 343 } 344 /* We want this option, duplicate it. */ 345 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 346 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 347 strcpy(new->name, opt->name); 348 if (opt->len != 0) { 349 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 350 bcopy(opt->value, new->value, opt->len); 351 } else { 352 new->value = NULL; 353 } 354 new->len = opt->len; 355 new->seen = opt->seen; 356 TAILQ_INSERT_TAIL(toopts, new, link); 357 next: 358 continue; 359 } 360 } 361 362 /* 363 * Mount a filesystem. 364 */ 365 int 366 nmount(td, uap) 367 struct thread *td; 368 struct nmount_args /* { 369 struct iovec *iovp; 370 unsigned int iovcnt; 371 int flags; 372 } */ *uap; 373 { 374 struct uio *auio; 375 int error; 376 u_int iovcnt; 377 378 AUDIT_ARG_FFLAGS(uap->flags); 379 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 380 uap->iovp, uap->iovcnt, uap->flags); 381 382 /* 383 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 384 * userspace to set this flag, but we must filter it out if we want 385 * MNT_UPDATE on the root file system to work. 386 * MNT_ROOTFS should only be set by the kernel when mounting its 387 * root file system. 388 */ 389 uap->flags &= ~MNT_ROOTFS; 390 391 iovcnt = uap->iovcnt; 392 /* 393 * Check that we have an even number of iovec's 394 * and that we have at least two options. 395 */ 396 if ((iovcnt & 1) || (iovcnt < 4)) { 397 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 398 uap->iovcnt); 399 return (EINVAL); 400 } 401 402 error = copyinuio(uap->iovp, iovcnt, &auio); 403 if (error) { 404 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 405 __func__, error); 406 return (error); 407 } 408 error = vfs_donmount(td, uap->flags, auio); 409 410 free(auio, M_IOV); 411 return (error); 412 } 413 414 /* 415 * --------------------------------------------------------------------- 416 * Various utility functions 417 */ 418 419 void 420 vfs_ref(struct mount *mp) 421 { 422 423 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 424 MNT_ILOCK(mp); 425 MNT_REF(mp); 426 MNT_IUNLOCK(mp); 427 } 428 429 void 430 vfs_rel(struct mount *mp) 431 { 432 433 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 434 MNT_ILOCK(mp); 435 MNT_REL(mp); 436 MNT_IUNLOCK(mp); 437 } 438 439 /* 440 * Allocate and initialize the mount point struct. 441 */ 442 struct mount * 443 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 444 struct ucred *cred) 445 { 446 struct mount *mp; 447 448 mp = uma_zalloc(mount_zone, M_WAITOK); 449 bzero(&mp->mnt_startzero, 450 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 451 TAILQ_INIT(&mp->mnt_nvnodelist); 452 mp->mnt_nvnodelistsize = 0; 453 mp->mnt_ref = 0; 454 (void) vfs_busy(mp, MBF_NOWAIT); 455 mp->mnt_op = vfsp->vfc_vfsops; 456 mp->mnt_vfc = vfsp; 457 vfsp->vfc_refcount++; /* XXX Unlocked */ 458 mp->mnt_stat.f_type = vfsp->vfc_typenum; 459 mp->mnt_gen++; 460 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 461 mp->mnt_vnodecovered = vp; 462 mp->mnt_cred = crdup(cred); 463 mp->mnt_stat.f_owner = cred->cr_uid; 464 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 465 mp->mnt_iosize_max = DFLTPHYS; 466 #ifdef MAC 467 mac_mount_init(mp); 468 mac_mount_create(cred, mp); 469 #endif 470 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 471 return (mp); 472 } 473 474 /* 475 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 476 */ 477 void 478 vfs_mount_destroy(struct mount *mp) 479 { 480 481 MNT_ILOCK(mp); 482 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 483 if (mp->mnt_kern_flag & MNTK_MWAIT) { 484 mp->mnt_kern_flag &= ~MNTK_MWAIT; 485 wakeup(mp); 486 } 487 while (mp->mnt_ref) 488 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 489 KASSERT(mp->mnt_ref == 0, 490 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 491 __FILE__, __LINE__)); 492 if (mp->mnt_writeopcount != 0) 493 panic("vfs_mount_destroy: nonzero writeopcount"); 494 if (mp->mnt_secondary_writes != 0) 495 panic("vfs_mount_destroy: nonzero secondary_writes"); 496 mp->mnt_vfc->vfc_refcount--; 497 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 498 struct vnode *vp; 499 500 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 501 vprint("", vp); 502 panic("unmount: dangling vnode"); 503 } 504 if (mp->mnt_nvnodelistsize != 0) 505 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 506 if (mp->mnt_lockref != 0) 507 panic("vfs_mount_destroy: nonzero lock refcount"); 508 MNT_IUNLOCK(mp); 509 #ifdef MAC 510 mac_mount_destroy(mp); 511 #endif 512 if (mp->mnt_opt != NULL) 513 vfs_freeopts(mp->mnt_opt); 514 crfree(mp->mnt_cred); 515 uma_zfree(mount_zone, mp); 516 } 517 518 int 519 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 520 { 521 struct vfsoptlist *optlist; 522 struct vfsopt *opt, *noro_opt, *tmp_opt; 523 char *fstype, *fspath, *errmsg; 524 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 525 int has_rw, has_noro; 526 527 errmsg = fspath = NULL; 528 errmsg_len = has_noro = has_rw = fspathlen = 0; 529 errmsg_pos = -1; 530 531 error = vfs_buildopts(fsoptions, &optlist); 532 if (error) 533 return (error); 534 535 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 536 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 537 538 /* 539 * We need these two options before the others, 540 * and they are mandatory for any filesystem. 541 * Ensure they are NUL terminated as well. 542 */ 543 fstypelen = 0; 544 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 545 if (error || fstype[fstypelen - 1] != '\0') { 546 error = EINVAL; 547 if (errmsg != NULL) 548 strncpy(errmsg, "Invalid fstype", errmsg_len); 549 goto bail; 550 } 551 fspathlen = 0; 552 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 553 if (error || fspath[fspathlen - 1] != '\0') { 554 error = EINVAL; 555 if (errmsg != NULL) 556 strncpy(errmsg, "Invalid fspath", errmsg_len); 557 goto bail; 558 } 559 560 /* 561 * We need to see if we have the "update" option 562 * before we call vfs_domount(), since vfs_domount() has special 563 * logic based on MNT_UPDATE. This is very important 564 * when we want to update the root filesystem. 565 */ 566 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 567 if (strcmp(opt->name, "update") == 0) { 568 fsflags |= MNT_UPDATE; 569 vfs_freeopt(optlist, opt); 570 } 571 else if (strcmp(opt->name, "async") == 0) 572 fsflags |= MNT_ASYNC; 573 else if (strcmp(opt->name, "force") == 0) { 574 fsflags |= MNT_FORCE; 575 vfs_freeopt(optlist, opt); 576 } 577 else if (strcmp(opt->name, "reload") == 0) { 578 fsflags |= MNT_RELOAD; 579 vfs_freeopt(optlist, opt); 580 } 581 else if (strcmp(opt->name, "multilabel") == 0) 582 fsflags |= MNT_MULTILABEL; 583 else if (strcmp(opt->name, "noasync") == 0) 584 fsflags &= ~MNT_ASYNC; 585 else if (strcmp(opt->name, "noatime") == 0) 586 fsflags |= MNT_NOATIME; 587 else if (strcmp(opt->name, "atime") == 0) { 588 free(opt->name, M_MOUNT); 589 opt->name = strdup("nonoatime", M_MOUNT); 590 } 591 else if (strcmp(opt->name, "noclusterr") == 0) 592 fsflags |= MNT_NOCLUSTERR; 593 else if (strcmp(opt->name, "clusterr") == 0) { 594 free(opt->name, M_MOUNT); 595 opt->name = strdup("nonoclusterr", M_MOUNT); 596 } 597 else if (strcmp(opt->name, "noclusterw") == 0) 598 fsflags |= MNT_NOCLUSTERW; 599 else if (strcmp(opt->name, "clusterw") == 0) { 600 free(opt->name, M_MOUNT); 601 opt->name = strdup("nonoclusterw", M_MOUNT); 602 } 603 else if (strcmp(opt->name, "noexec") == 0) 604 fsflags |= MNT_NOEXEC; 605 else if (strcmp(opt->name, "exec") == 0) { 606 free(opt->name, M_MOUNT); 607 opt->name = strdup("nonoexec", M_MOUNT); 608 } 609 else if (strcmp(opt->name, "nosuid") == 0) 610 fsflags |= MNT_NOSUID; 611 else if (strcmp(opt->name, "suid") == 0) { 612 free(opt->name, M_MOUNT); 613 opt->name = strdup("nonosuid", M_MOUNT); 614 } 615 else if (strcmp(opt->name, "nosymfollow") == 0) 616 fsflags |= MNT_NOSYMFOLLOW; 617 else if (strcmp(opt->name, "symfollow") == 0) { 618 free(opt->name, M_MOUNT); 619 opt->name = strdup("nonosymfollow", M_MOUNT); 620 } 621 else if (strcmp(opt->name, "noro") == 0) { 622 fsflags &= ~MNT_RDONLY; 623 has_noro = 1; 624 } 625 else if (strcmp(opt->name, "rw") == 0) { 626 fsflags &= ~MNT_RDONLY; 627 has_rw = 1; 628 } 629 else if (strcmp(opt->name, "ro") == 0) 630 fsflags |= MNT_RDONLY; 631 else if (strcmp(opt->name, "rdonly") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("ro", M_MOUNT); 634 fsflags |= MNT_RDONLY; 635 } 636 else if (strcmp(opt->name, "suiddir") == 0) 637 fsflags |= MNT_SUIDDIR; 638 else if (strcmp(opt->name, "sync") == 0) 639 fsflags |= MNT_SYNCHRONOUS; 640 else if (strcmp(opt->name, "union") == 0) 641 fsflags |= MNT_UNION; 642 } 643 644 /* 645 * If "rw" was specified as a mount option, and we 646 * are trying to update a mount-point from "ro" to "rw", 647 * we need a mount option "noro", since in vfs_mergeopts(), 648 * "noro" will cancel "ro", but "rw" will not do anything. 649 */ 650 if (has_rw && !has_noro) { 651 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 652 noro_opt->name = strdup("noro", M_MOUNT); 653 noro_opt->value = NULL; 654 noro_opt->len = 0; 655 noro_opt->pos = -1; 656 noro_opt->seen = 1; 657 TAILQ_INSERT_TAIL(optlist, noro_opt, link); 658 } 659 660 /* 661 * Be ultra-paranoid about making sure the type and fspath 662 * variables will fit in our mp buffers, including the 663 * terminating NUL. 664 */ 665 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 666 error = ENAMETOOLONG; 667 goto bail; 668 } 669 670 error = vfs_domount(td, fstype, fspath, fsflags, optlist); 671 bail: 672 /* copyout the errmsg */ 673 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 674 && errmsg_len > 0 && errmsg != NULL) { 675 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 676 bcopy(errmsg, 677 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 678 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 679 } else { 680 copyout(errmsg, 681 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 682 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 683 } 684 } 685 686 if (error != 0) 687 vfs_freeopts(optlist); 688 return (error); 689 } 690 691 /* 692 * Old mount API. 693 */ 694 #ifndef _SYS_SYSPROTO_H_ 695 struct mount_args { 696 char *type; 697 char *path; 698 int flags; 699 caddr_t data; 700 }; 701 #endif 702 /* ARGSUSED */ 703 int 704 mount(td, uap) 705 struct thread *td; 706 struct mount_args /* { 707 char *type; 708 char *path; 709 int flags; 710 caddr_t data; 711 } */ *uap; 712 { 713 char *fstype; 714 struct vfsconf *vfsp = NULL; 715 struct mntarg *ma = NULL; 716 int error; 717 718 AUDIT_ARG_FFLAGS(uap->flags); 719 720 /* 721 * Filter out MNT_ROOTFS. We do not want clients of mount() in 722 * userspace to set this flag, but we must filter it out if we want 723 * MNT_UPDATE on the root file system to work. 724 * MNT_ROOTFS should only be set by the kernel when mounting its 725 * root file system. 726 */ 727 uap->flags &= ~MNT_ROOTFS; 728 729 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 730 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 731 if (error) { 732 free(fstype, M_TEMP); 733 return (error); 734 } 735 736 AUDIT_ARG_TEXT(fstype); 737 mtx_lock(&Giant); 738 vfsp = vfs_byname_kld(fstype, td, &error); 739 free(fstype, M_TEMP); 740 if (vfsp == NULL) { 741 mtx_unlock(&Giant); 742 return (ENOENT); 743 } 744 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 745 mtx_unlock(&Giant); 746 return (EOPNOTSUPP); 747 } 748 749 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 750 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 751 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 752 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 753 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 754 755 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags); 756 mtx_unlock(&Giant); 757 return (error); 758 } 759 760 /* 761 * vfs_domount_first(): first file system mount (not update) 762 */ 763 static int 764 vfs_domount_first( 765 struct thread *td, /* Calling thread. */ 766 struct vfsconf *vfsp, /* File system type. */ 767 char *fspath, /* Mount path. */ 768 struct vnode *vp, /* Vnode to be covered. */ 769 int fsflags, /* Flags common to all filesystems. */ 770 void *fsdata /* Options local to the filesystem. */ 771 ) 772 { 773 struct vattr va; 774 struct mount *mp; 775 struct vnode *newdp; 776 int error; 777 778 mtx_assert(&Giant, MA_OWNED); 779 ASSERT_VOP_ELOCKED(vp, __func__); 780 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 781 782 /* 783 * If the user is not root, ensure that they own the directory 784 * onto which we are attempting to mount. 785 */ 786 error = VOP_GETATTR(vp, &va, td->td_ucred); 787 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 788 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 789 if (error == 0) 790 error = vinvalbuf(vp, V_SAVE, 0, 0); 791 if (error == 0 && vp->v_type != VDIR) 792 error = ENOTDIR; 793 if (error == 0) { 794 VI_LOCK(vp); 795 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 796 vp->v_iflag |= VI_MOUNT; 797 else 798 error = EBUSY; 799 VI_UNLOCK(vp); 800 } 801 if (error != 0) { 802 vput(vp); 803 return (error); 804 } 805 VOP_UNLOCK(vp, 0); 806 807 /* Allocate and initialize the filesystem. */ 808 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 809 /* XXXMAC: pass to vfs_mount_alloc? */ 810 mp->mnt_optnew = fsdata; 811 /* Set the mount level flags. */ 812 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 813 814 /* 815 * Mount the filesystem. 816 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 817 * get. No freeing of cn_pnbuf. 818 */ 819 error = VFS_MOUNT(mp); 820 if (error != 0) { 821 vfs_unbusy(mp); 822 vfs_mount_destroy(mp); 823 VI_LOCK(vp); 824 vp->v_iflag &= ~VI_MOUNT; 825 VI_UNLOCK(vp); 826 vrele(vp); 827 return (error); 828 } 829 830 if (mp->mnt_opt != NULL) 831 vfs_freeopts(mp->mnt_opt); 832 mp->mnt_opt = mp->mnt_optnew; 833 (void)VFS_STATFS(mp, &mp->mnt_stat); 834 835 /* 836 * Prevent external consumers of mount options from reading mnt_optnew. 837 */ 838 mp->mnt_optnew = NULL; 839 840 MNT_ILOCK(mp); 841 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 842 mp->mnt_kern_flag |= MNTK_ASYNC; 843 else 844 mp->mnt_kern_flag &= ~MNTK_ASYNC; 845 MNT_IUNLOCK(mp); 846 847 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 848 cache_purge(vp); 849 VI_LOCK(vp); 850 vp->v_iflag &= ~VI_MOUNT; 851 VI_UNLOCK(vp); 852 vp->v_mountedhere = mp; 853 /* Place the new filesystem at the end of the mount list. */ 854 mtx_lock(&mountlist_mtx); 855 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 856 mtx_unlock(&mountlist_mtx); 857 vfs_event_signal(NULL, VQ_MOUNT, 0); 858 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 859 panic("mount: lost mount"); 860 VOP_UNLOCK(newdp, 0); 861 VOP_UNLOCK(vp, 0); 862 mountcheckdirs(vp, newdp); 863 vrele(newdp); 864 if ((mp->mnt_flag & MNT_RDONLY) == 0) 865 vfs_allocate_syncvnode(mp); 866 vfs_unbusy(mp); 867 return (0); 868 } 869 870 /* 871 * vfs_domount_update(): update of mounted file system 872 */ 873 static int 874 vfs_domount_update( 875 struct thread *td, /* Calling thread. */ 876 struct vnode *vp, /* Mount point vnode. */ 877 int fsflags, /* Flags common to all filesystems. */ 878 void *fsdata /* Options local to the filesystem. */ 879 ) 880 { 881 struct oexport_args oexport; 882 struct export_args export; 883 struct mount *mp; 884 int error, flag; 885 886 mtx_assert(&Giant, MA_OWNED); 887 ASSERT_VOP_ELOCKED(vp, __func__); 888 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 889 890 if ((vp->v_vflag & VV_ROOT) == 0) { 891 vput(vp); 892 return (EINVAL); 893 } 894 mp = vp->v_mount; 895 /* 896 * We only allow the filesystem to be reloaded if it 897 * is currently mounted read-only. 898 */ 899 flag = mp->mnt_flag; 900 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 901 vput(vp); 902 return (EOPNOTSUPP); /* Needs translation */ 903 } 904 /* 905 * Only privileged root, or (if MNT_USER is set) the user that 906 * did the original mount is permitted to update it. 907 */ 908 error = vfs_suser(mp, td); 909 if (error != 0) { 910 vput(vp); 911 return (error); 912 } 913 if (vfs_busy(mp, MBF_NOWAIT)) { 914 vput(vp); 915 return (EBUSY); 916 } 917 VI_LOCK(vp); 918 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 919 VI_UNLOCK(vp); 920 vfs_unbusy(mp); 921 vput(vp); 922 return (EBUSY); 923 } 924 vp->v_iflag |= VI_MOUNT; 925 VI_UNLOCK(vp); 926 VOP_UNLOCK(vp, 0); 927 928 MNT_ILOCK(mp); 929 mp->mnt_flag &= ~MNT_UPDATEMASK; 930 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 931 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 932 if ((mp->mnt_flag & MNT_ASYNC) == 0) 933 mp->mnt_kern_flag &= ~MNTK_ASYNC; 934 MNT_IUNLOCK(mp); 935 mp->mnt_optnew = fsdata; 936 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 937 938 /* 939 * Mount the filesystem. 940 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 941 * get. No freeing of cn_pnbuf. 942 */ 943 error = VFS_MOUNT(mp); 944 945 if (error == 0) { 946 /* Process the export option. */ 947 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 948 sizeof(export)) == 0) { 949 error = vfs_export(mp, &export); 950 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 951 sizeof(oexport)) == 0) { 952 export.ex_flags = oexport.ex_flags; 953 export.ex_root = oexport.ex_root; 954 export.ex_anon = oexport.ex_anon; 955 export.ex_addr = oexport.ex_addr; 956 export.ex_addrlen = oexport.ex_addrlen; 957 export.ex_mask = oexport.ex_mask; 958 export.ex_masklen = oexport.ex_masklen; 959 export.ex_indexfile = oexport.ex_indexfile; 960 export.ex_numsecflavors = 0; 961 error = vfs_export(mp, &export); 962 } 963 } 964 965 MNT_ILOCK(mp); 966 if (error == 0) { 967 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 968 MNT_SNAPSHOT); 969 } else { 970 /* 971 * If we fail, restore old mount flags. MNT_QUOTA is special, 972 * because it is not part of MNT_UPDATEMASK, but it could have 973 * changed in the meantime if quotactl(2) was called. 974 * All in all we want current value of MNT_QUOTA, not the old 975 * one. 976 */ 977 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 978 } 979 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 980 mp->mnt_kern_flag |= MNTK_ASYNC; 981 else 982 mp->mnt_kern_flag &= ~MNTK_ASYNC; 983 MNT_IUNLOCK(mp); 984 985 if (error != 0) 986 goto end; 987 988 if (mp->mnt_opt != NULL) 989 vfs_freeopts(mp->mnt_opt); 990 mp->mnt_opt = mp->mnt_optnew; 991 (void)VFS_STATFS(mp, &mp->mnt_stat); 992 /* 993 * Prevent external consumers of mount options from reading 994 * mnt_optnew. 995 */ 996 mp->mnt_optnew = NULL; 997 998 if ((mp->mnt_flag & MNT_RDONLY) == 0) 999 vfs_allocate_syncvnode(mp); 1000 else 1001 vfs_deallocate_syncvnode(mp); 1002 end: 1003 vfs_unbusy(mp); 1004 VI_LOCK(vp); 1005 vp->v_iflag &= ~VI_MOUNT; 1006 VI_UNLOCK(vp); 1007 vrele(vp); 1008 return (error); 1009 } 1010 1011 /* 1012 * vfs_domount(): actually attempt a filesystem mount. 1013 */ 1014 static int 1015 vfs_domount( 1016 struct thread *td, /* Calling thread. */ 1017 const char *fstype, /* Filesystem type. */ 1018 char *fspath, /* Mount path. */ 1019 int fsflags, /* Flags common to all filesystems. */ 1020 void *fsdata /* Options local to the filesystem. */ 1021 ) 1022 { 1023 struct vfsconf *vfsp; 1024 struct nameidata nd; 1025 struct vnode *vp; 1026 int error; 1027 1028 /* 1029 * Be ultra-paranoid about making sure the type and fspath 1030 * variables will fit in our mp buffers, including the 1031 * terminating NUL. 1032 */ 1033 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1034 return (ENAMETOOLONG); 1035 1036 if (jailed(td->td_ucred) || usermount == 0) { 1037 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1038 return (error); 1039 } 1040 1041 /* 1042 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1043 */ 1044 if (fsflags & MNT_EXPORTED) { 1045 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1046 if (error) 1047 return (error); 1048 } 1049 if (fsflags & MNT_SUIDDIR) { 1050 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1051 if (error) 1052 return (error); 1053 } 1054 /* 1055 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1056 */ 1057 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1058 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1059 fsflags |= MNT_NOSUID | MNT_USER; 1060 } 1061 1062 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1063 vfsp = NULL; 1064 if ((fsflags & MNT_UPDATE) == 0) { 1065 /* Don't try to load KLDs if we're mounting the root. */ 1066 if (fsflags & MNT_ROOTFS) 1067 vfsp = vfs_byname(fstype); 1068 else 1069 vfsp = vfs_byname_kld(fstype, td, &error); 1070 if (vfsp == NULL) 1071 return (ENODEV); 1072 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1073 return (EPERM); 1074 } 1075 1076 /* 1077 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1078 */ 1079 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1080 UIO_SYSSPACE, fspath, td); 1081 error = namei(&nd); 1082 if (error != 0) 1083 return (error); 1084 if (!NDHASGIANT(&nd)) 1085 mtx_lock(&Giant); 1086 NDFREE(&nd, NDF_ONLY_PNBUF); 1087 vp = nd.ni_vp; 1088 if ((fsflags & MNT_UPDATE) == 0) { 1089 error = vfs_domount_first(td, vfsp, fspath, vp, fsflags, 1090 fsdata); 1091 } else { 1092 error = vfs_domount_update(td, vp, fsflags, fsdata); 1093 } 1094 mtx_unlock(&Giant); 1095 1096 ASSERT_VI_UNLOCKED(vp, __func__); 1097 ASSERT_VOP_UNLOCKED(vp, __func__); 1098 1099 return (error); 1100 } 1101 1102 /* 1103 * Unmount a filesystem. 1104 * 1105 * Note: unmount takes a path to the vnode mounted on as argument, not 1106 * special file (as before). 1107 */ 1108 #ifndef _SYS_SYSPROTO_H_ 1109 struct unmount_args { 1110 char *path; 1111 int flags; 1112 }; 1113 #endif 1114 /* ARGSUSED */ 1115 int 1116 unmount(td, uap) 1117 struct thread *td; 1118 register struct unmount_args /* { 1119 char *path; 1120 int flags; 1121 } */ *uap; 1122 { 1123 struct mount *mp; 1124 char *pathbuf; 1125 int error, id0, id1; 1126 1127 AUDIT_ARG_VALUE(uap->flags); 1128 if (jailed(td->td_ucred) || usermount == 0) { 1129 error = priv_check(td, PRIV_VFS_UNMOUNT); 1130 if (error) 1131 return (error); 1132 } 1133 1134 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1135 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1136 if (error) { 1137 free(pathbuf, M_TEMP); 1138 return (error); 1139 } 1140 mtx_lock(&Giant); 1141 if (uap->flags & MNT_BYFSID) { 1142 AUDIT_ARG_TEXT(pathbuf); 1143 /* Decode the filesystem ID. */ 1144 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1145 mtx_unlock(&Giant); 1146 free(pathbuf, M_TEMP); 1147 return (EINVAL); 1148 } 1149 1150 mtx_lock(&mountlist_mtx); 1151 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1152 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1153 mp->mnt_stat.f_fsid.val[1] == id1) 1154 break; 1155 } 1156 mtx_unlock(&mountlist_mtx); 1157 } else { 1158 AUDIT_ARG_UPATH1(td, pathbuf); 1159 mtx_lock(&mountlist_mtx); 1160 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1161 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1162 break; 1163 } 1164 mtx_unlock(&mountlist_mtx); 1165 } 1166 free(pathbuf, M_TEMP); 1167 if (mp == NULL) { 1168 /* 1169 * Previously we returned ENOENT for a nonexistent path and 1170 * EINVAL for a non-mountpoint. We cannot tell these apart 1171 * now, so in the !MNT_BYFSID case return the more likely 1172 * EINVAL for compatibility. 1173 */ 1174 mtx_unlock(&Giant); 1175 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1176 } 1177 1178 /* 1179 * Don't allow unmounting the root filesystem. 1180 */ 1181 if (mp->mnt_flag & MNT_ROOTFS) { 1182 mtx_unlock(&Giant); 1183 return (EINVAL); 1184 } 1185 error = dounmount(mp, uap->flags, td); 1186 mtx_unlock(&Giant); 1187 return (error); 1188 } 1189 1190 /* 1191 * Do the actual filesystem unmount. 1192 */ 1193 int 1194 dounmount(mp, flags, td) 1195 struct mount *mp; 1196 int flags; 1197 struct thread *td; 1198 { 1199 struct vnode *coveredvp, *fsrootvp; 1200 int error; 1201 int async_flag; 1202 int mnt_gen_r; 1203 1204 mtx_assert(&Giant, MA_OWNED); 1205 1206 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1207 mnt_gen_r = mp->mnt_gen; 1208 VI_LOCK(coveredvp); 1209 vholdl(coveredvp); 1210 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1211 vdrop(coveredvp); 1212 /* 1213 * Check for mp being unmounted while waiting for the 1214 * covered vnode lock. 1215 */ 1216 if (coveredvp->v_mountedhere != mp || 1217 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1218 VOP_UNLOCK(coveredvp, 0); 1219 return (EBUSY); 1220 } 1221 } 1222 /* 1223 * Only privileged root, or (if MNT_USER is set) the user that did the 1224 * original mount is permitted to unmount this filesystem. 1225 */ 1226 error = vfs_suser(mp, td); 1227 if (error) { 1228 if (coveredvp) 1229 VOP_UNLOCK(coveredvp, 0); 1230 return (error); 1231 } 1232 1233 MNT_ILOCK(mp); 1234 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1235 MNT_IUNLOCK(mp); 1236 if (coveredvp) 1237 VOP_UNLOCK(coveredvp, 0); 1238 return (EBUSY); 1239 } 1240 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1241 /* Allow filesystems to detect that a forced unmount is in progress. */ 1242 if (flags & MNT_FORCE) 1243 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1244 error = 0; 1245 if (mp->mnt_lockref) { 1246 if ((flags & MNT_FORCE) == 0) { 1247 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ | 1248 MNTK_UNMOUNTF); 1249 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1250 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1251 wakeup(mp); 1252 } 1253 MNT_IUNLOCK(mp); 1254 if (coveredvp) 1255 VOP_UNLOCK(coveredvp, 0); 1256 return (EBUSY); 1257 } 1258 mp->mnt_kern_flag |= MNTK_DRAINING; 1259 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1260 "mount drain", 0); 1261 } 1262 MNT_IUNLOCK(mp); 1263 KASSERT(mp->mnt_lockref == 0, 1264 ("%s: invalid lock refcount in the drain path @ %s:%d", 1265 __func__, __FILE__, __LINE__)); 1266 KASSERT(error == 0, 1267 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1268 __func__, __FILE__, __LINE__)); 1269 vn_start_write(NULL, &mp, V_WAIT); 1270 1271 if (mp->mnt_flag & MNT_EXPUBLIC) 1272 vfs_setpublicfs(NULL, NULL, NULL); 1273 1274 vfs_msync(mp, MNT_WAIT); 1275 MNT_ILOCK(mp); 1276 async_flag = mp->mnt_flag & MNT_ASYNC; 1277 mp->mnt_flag &= ~MNT_ASYNC; 1278 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1279 MNT_IUNLOCK(mp); 1280 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1281 vfs_deallocate_syncvnode(mp); 1282 /* 1283 * For forced unmounts, move process cdir/rdir refs on the fs root 1284 * vnode to the covered vnode. For non-forced unmounts we want 1285 * such references to cause an EBUSY error. 1286 */ 1287 if ((flags & MNT_FORCE) && 1288 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1289 if (mp->mnt_vnodecovered != NULL) 1290 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1291 if (fsrootvp == rootvnode) { 1292 vrele(rootvnode); 1293 rootvnode = NULL; 1294 } 1295 vput(fsrootvp); 1296 } 1297 if (((mp->mnt_flag & MNT_RDONLY) || 1298 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1299 error = VFS_UNMOUNT(mp, flags); 1300 vn_finished_write(mp); 1301 /* 1302 * If we failed to flush the dirty blocks for this mount point, 1303 * undo all the cdir/rdir and rootvnode changes we made above. 1304 * Unless we failed to do so because the device is reporting that 1305 * it doesn't exist anymore. 1306 */ 1307 if (error && error != ENXIO) { 1308 if ((flags & MNT_FORCE) && 1309 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1310 if (mp->mnt_vnodecovered != NULL) 1311 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1312 if (rootvnode == NULL) { 1313 rootvnode = fsrootvp; 1314 vref(rootvnode); 1315 } 1316 vput(fsrootvp); 1317 } 1318 MNT_ILOCK(mp); 1319 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1320 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1321 MNT_IUNLOCK(mp); 1322 vfs_allocate_syncvnode(mp); 1323 MNT_ILOCK(mp); 1324 } 1325 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1326 mp->mnt_flag |= async_flag; 1327 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1328 mp->mnt_kern_flag |= MNTK_ASYNC; 1329 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1330 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1331 wakeup(mp); 1332 } 1333 MNT_IUNLOCK(mp); 1334 if (coveredvp) 1335 VOP_UNLOCK(coveredvp, 0); 1336 return (error); 1337 } 1338 mtx_lock(&mountlist_mtx); 1339 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1340 mtx_unlock(&mountlist_mtx); 1341 if (coveredvp != NULL) { 1342 coveredvp->v_mountedhere = NULL; 1343 vput(coveredvp); 1344 } 1345 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1346 vfs_mount_destroy(mp); 1347 return (0); 1348 } 1349 1350 /* 1351 * Report errors during filesystem mounting. 1352 */ 1353 void 1354 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1355 { 1356 struct vfsoptlist *moptlist = mp->mnt_optnew; 1357 va_list ap; 1358 int error, len; 1359 char *errmsg; 1360 1361 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1362 if (error || errmsg == NULL || len <= 0) 1363 return; 1364 1365 va_start(ap, fmt); 1366 vsnprintf(errmsg, (size_t)len, fmt, ap); 1367 va_end(ap); 1368 } 1369 1370 void 1371 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1372 { 1373 va_list ap; 1374 int error, len; 1375 char *errmsg; 1376 1377 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1378 if (error || errmsg == NULL || len <= 0) 1379 return; 1380 1381 va_start(ap, fmt); 1382 vsnprintf(errmsg, (size_t)len, fmt, ap); 1383 va_end(ap); 1384 } 1385 1386 /* 1387 * --------------------------------------------------------------------- 1388 * Functions for querying mount options/arguments from filesystems. 1389 */ 1390 1391 /* 1392 * Check that no unknown options are given 1393 */ 1394 int 1395 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1396 { 1397 struct vfsopt *opt; 1398 char errmsg[255]; 1399 const char **t, *p, *q; 1400 int ret = 0; 1401 1402 TAILQ_FOREACH(opt, opts, link) { 1403 p = opt->name; 1404 q = NULL; 1405 if (p[0] == 'n' && p[1] == 'o') 1406 q = p + 2; 1407 for(t = global_opts; *t != NULL; t++) { 1408 if (strcmp(*t, p) == 0) 1409 break; 1410 if (q != NULL) { 1411 if (strcmp(*t, q) == 0) 1412 break; 1413 } 1414 } 1415 if (*t != NULL) 1416 continue; 1417 for(t = legal; *t != NULL; t++) { 1418 if (strcmp(*t, p) == 0) 1419 break; 1420 if (q != NULL) { 1421 if (strcmp(*t, q) == 0) 1422 break; 1423 } 1424 } 1425 if (*t != NULL) 1426 continue; 1427 snprintf(errmsg, sizeof(errmsg), 1428 "mount option <%s> is unknown", p); 1429 ret = EINVAL; 1430 } 1431 if (ret != 0) { 1432 TAILQ_FOREACH(opt, opts, link) { 1433 if (strcmp(opt->name, "errmsg") == 0) { 1434 strncpy((char *)opt->value, errmsg, opt->len); 1435 break; 1436 } 1437 } 1438 if (opt == NULL) 1439 printf("%s\n", errmsg); 1440 } 1441 return (ret); 1442 } 1443 1444 /* 1445 * Get a mount option by its name. 1446 * 1447 * Return 0 if the option was found, ENOENT otherwise. 1448 * If len is non-NULL it will be filled with the length 1449 * of the option. If buf is non-NULL, it will be filled 1450 * with the address of the option. 1451 */ 1452 int 1453 vfs_getopt(opts, name, buf, len) 1454 struct vfsoptlist *opts; 1455 const char *name; 1456 void **buf; 1457 int *len; 1458 { 1459 struct vfsopt *opt; 1460 1461 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1462 1463 TAILQ_FOREACH(opt, opts, link) { 1464 if (strcmp(name, opt->name) == 0) { 1465 opt->seen = 1; 1466 if (len != NULL) 1467 *len = opt->len; 1468 if (buf != NULL) 1469 *buf = opt->value; 1470 return (0); 1471 } 1472 } 1473 return (ENOENT); 1474 } 1475 1476 int 1477 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1478 { 1479 struct vfsopt *opt; 1480 1481 if (opts == NULL) 1482 return (-1); 1483 1484 TAILQ_FOREACH(opt, opts, link) { 1485 if (strcmp(name, opt->name) == 0) { 1486 opt->seen = 1; 1487 return (opt->pos); 1488 } 1489 } 1490 return (-1); 1491 } 1492 1493 char * 1494 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1495 { 1496 struct vfsopt *opt; 1497 1498 *error = 0; 1499 TAILQ_FOREACH(opt, opts, link) { 1500 if (strcmp(name, opt->name) != 0) 1501 continue; 1502 opt->seen = 1; 1503 if (opt->len == 0 || 1504 ((char *)opt->value)[opt->len - 1] != '\0') { 1505 *error = EINVAL; 1506 return (NULL); 1507 } 1508 return (opt->value); 1509 } 1510 *error = ENOENT; 1511 return (NULL); 1512 } 1513 1514 int 1515 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1516 { 1517 struct vfsopt *opt; 1518 1519 TAILQ_FOREACH(opt, opts, link) { 1520 if (strcmp(name, opt->name) == 0) { 1521 opt->seen = 1; 1522 if (w != NULL) 1523 *w |= val; 1524 return (1); 1525 } 1526 } 1527 if (w != NULL) 1528 *w &= ~val; 1529 return (0); 1530 } 1531 1532 int 1533 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1534 { 1535 va_list ap; 1536 struct vfsopt *opt; 1537 int ret; 1538 1539 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1540 1541 TAILQ_FOREACH(opt, opts, link) { 1542 if (strcmp(name, opt->name) != 0) 1543 continue; 1544 opt->seen = 1; 1545 if (opt->len == 0 || opt->value == NULL) 1546 return (0); 1547 if (((char *)opt->value)[opt->len - 1] != '\0') 1548 return (0); 1549 va_start(ap, fmt); 1550 ret = vsscanf(opt->value, fmt, ap); 1551 va_end(ap); 1552 return (ret); 1553 } 1554 return (0); 1555 } 1556 1557 int 1558 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1559 { 1560 struct vfsopt *opt; 1561 1562 TAILQ_FOREACH(opt, opts, link) { 1563 if (strcmp(name, opt->name) != 0) 1564 continue; 1565 opt->seen = 1; 1566 if (opt->value == NULL) 1567 opt->len = len; 1568 else { 1569 if (opt->len != len) 1570 return (EINVAL); 1571 bcopy(value, opt->value, len); 1572 } 1573 return (0); 1574 } 1575 return (ENOENT); 1576 } 1577 1578 int 1579 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1580 { 1581 struct vfsopt *opt; 1582 1583 TAILQ_FOREACH(opt, opts, link) { 1584 if (strcmp(name, opt->name) != 0) 1585 continue; 1586 opt->seen = 1; 1587 if (opt->value == NULL) 1588 opt->len = len; 1589 else { 1590 if (opt->len < len) 1591 return (EINVAL); 1592 opt->len = len; 1593 bcopy(value, opt->value, len); 1594 } 1595 return (0); 1596 } 1597 return (ENOENT); 1598 } 1599 1600 int 1601 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1602 { 1603 struct vfsopt *opt; 1604 1605 TAILQ_FOREACH(opt, opts, link) { 1606 if (strcmp(name, opt->name) != 0) 1607 continue; 1608 opt->seen = 1; 1609 if (opt->value == NULL) 1610 opt->len = strlen(value) + 1; 1611 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1612 return (EINVAL); 1613 return (0); 1614 } 1615 return (ENOENT); 1616 } 1617 1618 /* 1619 * Find and copy a mount option. 1620 * 1621 * The size of the buffer has to be specified 1622 * in len, if it is not the same length as the 1623 * mount option, EINVAL is returned. 1624 * Returns ENOENT if the option is not found. 1625 */ 1626 int 1627 vfs_copyopt(opts, name, dest, len) 1628 struct vfsoptlist *opts; 1629 const char *name; 1630 void *dest; 1631 int len; 1632 { 1633 struct vfsopt *opt; 1634 1635 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1636 1637 TAILQ_FOREACH(opt, opts, link) { 1638 if (strcmp(name, opt->name) == 0) { 1639 opt->seen = 1; 1640 if (len != opt->len) 1641 return (EINVAL); 1642 bcopy(opt->value, dest, opt->len); 1643 return (0); 1644 } 1645 } 1646 return (ENOENT); 1647 } 1648 1649 /* 1650 * This is a helper function for filesystems to traverse their 1651 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1652 */ 1653 1654 struct vnode * 1655 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1656 { 1657 struct vnode *vp; 1658 1659 mtx_assert(MNT_MTX(mp), MA_OWNED); 1660 1661 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1662 if ((*mvp)->v_yield++ == 500) { 1663 MNT_IUNLOCK(mp); 1664 (*mvp)->v_yield = 0; 1665 uio_yield(); 1666 MNT_ILOCK(mp); 1667 } 1668 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1669 while (vp != NULL && vp->v_type == VMARKER) 1670 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1671 1672 /* Check if we are done */ 1673 if (vp == NULL) { 1674 __mnt_vnode_markerfree(mvp, mp); 1675 return (NULL); 1676 } 1677 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1678 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1679 return (vp); 1680 } 1681 1682 struct vnode * 1683 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1684 { 1685 struct vnode *vp; 1686 1687 mtx_assert(MNT_MTX(mp), MA_OWNED); 1688 1689 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1690 while (vp != NULL && vp->v_type == VMARKER) 1691 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1692 1693 /* Check if we are done */ 1694 if (vp == NULL) { 1695 *mvp = NULL; 1696 return (NULL); 1697 } 1698 MNT_REF(mp); 1699 MNT_IUNLOCK(mp); 1700 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1701 M_VNODE_MARKER, 1702 M_WAITOK | M_ZERO); 1703 MNT_ILOCK(mp); 1704 (*mvp)->v_type = VMARKER; 1705 1706 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1707 while (vp != NULL && vp->v_type == VMARKER) 1708 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1709 1710 /* Check if we are done */ 1711 if (vp == NULL) { 1712 MNT_IUNLOCK(mp); 1713 free(*mvp, M_VNODE_MARKER); 1714 MNT_ILOCK(mp); 1715 *mvp = NULL; 1716 MNT_REL(mp); 1717 return (NULL); 1718 } 1719 (*mvp)->v_mount = mp; 1720 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1721 return (vp); 1722 } 1723 1724 1725 void 1726 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1727 { 1728 1729 if (*mvp == NULL) 1730 return; 1731 1732 mtx_assert(MNT_MTX(mp), MA_OWNED); 1733 1734 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1735 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1736 MNT_IUNLOCK(mp); 1737 free(*mvp, M_VNODE_MARKER); 1738 MNT_ILOCK(mp); 1739 *mvp = NULL; 1740 MNT_REL(mp); 1741 } 1742 1743 1744 int 1745 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1746 { 1747 int error; 1748 1749 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1750 if (sbp != &mp->mnt_stat) 1751 *sbp = mp->mnt_stat; 1752 return (error); 1753 } 1754 1755 void 1756 vfs_mountedfrom(struct mount *mp, const char *from) 1757 { 1758 1759 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1760 strlcpy(mp->mnt_stat.f_mntfromname, from, 1761 sizeof mp->mnt_stat.f_mntfromname); 1762 } 1763 1764 /* 1765 * --------------------------------------------------------------------- 1766 * This is the api for building mount args and mounting filesystems from 1767 * inside the kernel. 1768 * 1769 * The API works by accumulation of individual args. First error is 1770 * latched. 1771 * 1772 * XXX: should be documented in new manpage kernel_mount(9) 1773 */ 1774 1775 /* A memory allocation which must be freed when we are done */ 1776 struct mntaarg { 1777 SLIST_ENTRY(mntaarg) next; 1778 }; 1779 1780 /* The header for the mount arguments */ 1781 struct mntarg { 1782 struct iovec *v; 1783 int len; 1784 int error; 1785 SLIST_HEAD(, mntaarg) list; 1786 }; 1787 1788 /* 1789 * Add a boolean argument. 1790 * 1791 * flag is the boolean value. 1792 * name must start with "no". 1793 */ 1794 struct mntarg * 1795 mount_argb(struct mntarg *ma, int flag, const char *name) 1796 { 1797 1798 KASSERT(name[0] == 'n' && name[1] == 'o', 1799 ("mount_argb(...,%s): name must start with 'no'", name)); 1800 1801 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1802 } 1803 1804 /* 1805 * Add an argument printf style 1806 */ 1807 struct mntarg * 1808 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1809 { 1810 va_list ap; 1811 struct mntaarg *maa; 1812 struct sbuf *sb; 1813 int len; 1814 1815 if (ma == NULL) { 1816 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1817 SLIST_INIT(&ma->list); 1818 } 1819 if (ma->error) 1820 return (ma); 1821 1822 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1823 M_MOUNT, M_WAITOK); 1824 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1825 ma->v[ma->len].iov_len = strlen(name) + 1; 1826 ma->len++; 1827 1828 sb = sbuf_new_auto(); 1829 va_start(ap, fmt); 1830 sbuf_vprintf(sb, fmt, ap); 1831 va_end(ap); 1832 sbuf_finish(sb); 1833 len = sbuf_len(sb) + 1; 1834 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1835 SLIST_INSERT_HEAD(&ma->list, maa, next); 1836 bcopy(sbuf_data(sb), maa + 1, len); 1837 sbuf_delete(sb); 1838 1839 ma->v[ma->len].iov_base = maa + 1; 1840 ma->v[ma->len].iov_len = len; 1841 ma->len++; 1842 1843 return (ma); 1844 } 1845 1846 /* 1847 * Add an argument which is a userland string. 1848 */ 1849 struct mntarg * 1850 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1851 { 1852 struct mntaarg *maa; 1853 char *tbuf; 1854 1855 if (val == NULL) 1856 return (ma); 1857 if (ma == NULL) { 1858 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1859 SLIST_INIT(&ma->list); 1860 } 1861 if (ma->error) 1862 return (ma); 1863 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1864 SLIST_INSERT_HEAD(&ma->list, maa, next); 1865 tbuf = (void *)(maa + 1); 1866 ma->error = copyinstr(val, tbuf, len, NULL); 1867 return (mount_arg(ma, name, tbuf, -1)); 1868 } 1869 1870 /* 1871 * Plain argument. 1872 * 1873 * If length is -1, treat value as a C string. 1874 */ 1875 struct mntarg * 1876 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1877 { 1878 1879 if (ma == NULL) { 1880 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1881 SLIST_INIT(&ma->list); 1882 } 1883 if (ma->error) 1884 return (ma); 1885 1886 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1887 M_MOUNT, M_WAITOK); 1888 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1889 ma->v[ma->len].iov_len = strlen(name) + 1; 1890 ma->len++; 1891 1892 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1893 if (len < 0) 1894 ma->v[ma->len].iov_len = strlen(val) + 1; 1895 else 1896 ma->v[ma->len].iov_len = len; 1897 ma->len++; 1898 return (ma); 1899 } 1900 1901 /* 1902 * Free a mntarg structure 1903 */ 1904 static void 1905 free_mntarg(struct mntarg *ma) 1906 { 1907 struct mntaarg *maa; 1908 1909 while (!SLIST_EMPTY(&ma->list)) { 1910 maa = SLIST_FIRST(&ma->list); 1911 SLIST_REMOVE_HEAD(&ma->list, next); 1912 free(maa, M_MOUNT); 1913 } 1914 free(ma->v, M_MOUNT); 1915 free(ma, M_MOUNT); 1916 } 1917 1918 /* 1919 * Mount a filesystem 1920 */ 1921 int 1922 kernel_mount(struct mntarg *ma, int flags) 1923 { 1924 struct uio auio; 1925 int error; 1926 1927 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1928 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1929 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1930 1931 auio.uio_iov = ma->v; 1932 auio.uio_iovcnt = ma->len; 1933 auio.uio_segflg = UIO_SYSSPACE; 1934 1935 error = ma->error; 1936 if (!error) 1937 error = vfs_donmount(curthread, flags, &auio); 1938 free_mntarg(ma); 1939 return (error); 1940 } 1941 1942 /* 1943 * A printflike function to mount a filesystem. 1944 */ 1945 int 1946 kernel_vmount(int flags, ...) 1947 { 1948 struct mntarg *ma = NULL; 1949 va_list ap; 1950 const char *cp; 1951 const void *vp; 1952 int error; 1953 1954 va_start(ap, flags); 1955 for (;;) { 1956 cp = va_arg(ap, const char *); 1957 if (cp == NULL) 1958 break; 1959 vp = va_arg(ap, const void *); 1960 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1961 } 1962 va_end(ap); 1963 1964 error = kernel_mount(ma, flags); 1965 return (error); 1966 } 1967 1968 void 1969 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1970 { 1971 1972 bcopy(oexp, exp, sizeof(*oexp)); 1973 exp->ex_numsecflavors = 0; 1974 } 1975