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, struct vfsoptlist **optlist); 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 (optlist != NULL) 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 struct vfsoptlist **optlist /* Options local to the filesystem. */ 771 ) 772 { 773 struct vattr va; 774 struct mount *mp; 775 struct vnode *newdp; 776 int error; 777 778 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 = *optlist; 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 *optlist = NULL; 834 (void)VFS_STATFS(mp, &mp->mnt_stat); 835 836 /* 837 * Prevent external consumers of mount options from reading mnt_optnew. 838 */ 839 mp->mnt_optnew = NULL; 840 841 MNT_ILOCK(mp); 842 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 843 mp->mnt_kern_flag |= MNTK_ASYNC; 844 else 845 mp->mnt_kern_flag &= ~MNTK_ASYNC; 846 MNT_IUNLOCK(mp); 847 848 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 849 cache_purge(vp); 850 VI_LOCK(vp); 851 vp->v_iflag &= ~VI_MOUNT; 852 VI_UNLOCK(vp); 853 vp->v_mountedhere = mp; 854 /* Place the new filesystem at the end of the mount list. */ 855 mtx_lock(&mountlist_mtx); 856 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 857 mtx_unlock(&mountlist_mtx); 858 vfs_event_signal(NULL, VQ_MOUNT, 0); 859 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 860 panic("mount: lost mount"); 861 VOP_UNLOCK(newdp, 0); 862 VOP_UNLOCK(vp, 0); 863 mountcheckdirs(vp, newdp); 864 vrele(newdp); 865 if ((mp->mnt_flag & MNT_RDONLY) == 0) 866 vfs_allocate_syncvnode(mp); 867 vfs_unbusy(mp); 868 return (0); 869 } 870 871 /* 872 * vfs_domount_update(): update of mounted file system 873 */ 874 static int 875 vfs_domount_update( 876 struct thread *td, /* Calling thread. */ 877 struct vnode *vp, /* Mount point vnode. */ 878 int fsflags, /* Flags common to all filesystems. */ 879 struct vfsoptlist **optlist /* Options local to the filesystem. */ 880 ) 881 { 882 struct oexport_args oexport; 883 struct export_args export; 884 struct mount *mp; 885 int error, export_error, flag; 886 887 mtx_assert(&Giant, MA_OWNED); 888 ASSERT_VOP_ELOCKED(vp, __func__); 889 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 890 891 if ((vp->v_vflag & VV_ROOT) == 0) { 892 vput(vp); 893 return (EINVAL); 894 } 895 mp = vp->v_mount; 896 /* 897 * We only allow the filesystem to be reloaded if it 898 * is currently mounted read-only. 899 */ 900 flag = mp->mnt_flag; 901 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 902 vput(vp); 903 return (EOPNOTSUPP); /* Needs translation */ 904 } 905 /* 906 * Only privileged root, or (if MNT_USER is set) the user that 907 * did the original mount is permitted to update it. 908 */ 909 error = vfs_suser(mp, td); 910 if (error != 0) { 911 vput(vp); 912 return (error); 913 } 914 if (vfs_busy(mp, MBF_NOWAIT)) { 915 vput(vp); 916 return (EBUSY); 917 } 918 VI_LOCK(vp); 919 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 920 VI_UNLOCK(vp); 921 vfs_unbusy(mp); 922 vput(vp); 923 return (EBUSY); 924 } 925 vp->v_iflag |= VI_MOUNT; 926 VI_UNLOCK(vp); 927 VOP_UNLOCK(vp, 0); 928 929 MNT_ILOCK(mp); 930 mp->mnt_flag &= ~MNT_UPDATEMASK; 931 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 932 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 933 if ((mp->mnt_flag & MNT_ASYNC) == 0) 934 mp->mnt_kern_flag &= ~MNTK_ASYNC; 935 MNT_IUNLOCK(mp); 936 mp->mnt_optnew = *optlist; 937 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 938 939 /* 940 * Mount the filesystem. 941 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 942 * get. No freeing of cn_pnbuf. 943 */ 944 error = VFS_MOUNT(mp); 945 946 export_error = 0; 947 if (error == 0) { 948 /* Process the export option. */ 949 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 950 sizeof(export)) == 0) { 951 export_error = vfs_export(mp, &export); 952 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 953 sizeof(oexport)) == 0) { 954 export.ex_flags = oexport.ex_flags; 955 export.ex_root = oexport.ex_root; 956 export.ex_anon = oexport.ex_anon; 957 export.ex_addr = oexport.ex_addr; 958 export.ex_addrlen = oexport.ex_addrlen; 959 export.ex_mask = oexport.ex_mask; 960 export.ex_masklen = oexport.ex_masklen; 961 export.ex_indexfile = oexport.ex_indexfile; 962 export.ex_numsecflavors = 0; 963 export_error = vfs_export(mp, &export); 964 } 965 } 966 967 MNT_ILOCK(mp); 968 if (error == 0) { 969 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 970 MNT_SNAPSHOT); 971 } else { 972 /* 973 * If we fail, restore old mount flags. MNT_QUOTA is special, 974 * because it is not part of MNT_UPDATEMASK, but it could have 975 * changed in the meantime if quotactl(2) was called. 976 * All in all we want current value of MNT_QUOTA, not the old 977 * one. 978 */ 979 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 980 } 981 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 982 mp->mnt_kern_flag |= MNTK_ASYNC; 983 else 984 mp->mnt_kern_flag &= ~MNTK_ASYNC; 985 MNT_IUNLOCK(mp); 986 987 if (error != 0) 988 goto end; 989 990 if (mp->mnt_opt != NULL) 991 vfs_freeopts(mp->mnt_opt); 992 mp->mnt_opt = mp->mnt_optnew; 993 *optlist = NULL; 994 (void)VFS_STATFS(mp, &mp->mnt_stat); 995 /* 996 * Prevent external consumers of mount options from reading 997 * mnt_optnew. 998 */ 999 mp->mnt_optnew = NULL; 1000 1001 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1002 vfs_allocate_syncvnode(mp); 1003 else 1004 vfs_deallocate_syncvnode(mp); 1005 end: 1006 vfs_unbusy(mp); 1007 VI_LOCK(vp); 1008 vp->v_iflag &= ~VI_MOUNT; 1009 VI_UNLOCK(vp); 1010 vrele(vp); 1011 return (error != 0 ? error : export_error); 1012 } 1013 1014 /* 1015 * vfs_domount(): actually attempt a filesystem mount. 1016 */ 1017 static int 1018 vfs_domount( 1019 struct thread *td, /* Calling thread. */ 1020 const char *fstype, /* Filesystem type. */ 1021 char *fspath, /* Mount path. */ 1022 int fsflags, /* Flags common to all filesystems. */ 1023 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1024 ) 1025 { 1026 struct vfsconf *vfsp; 1027 struct nameidata nd; 1028 struct vnode *vp; 1029 int error; 1030 1031 /* 1032 * Be ultra-paranoid about making sure the type and fspath 1033 * variables will fit in our mp buffers, including the 1034 * terminating NUL. 1035 */ 1036 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1037 return (ENAMETOOLONG); 1038 1039 if (jailed(td->td_ucred) || usermount == 0) { 1040 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1041 return (error); 1042 } 1043 1044 /* 1045 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1046 */ 1047 if (fsflags & MNT_EXPORTED) { 1048 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1049 if (error) 1050 return (error); 1051 } 1052 if (fsflags & MNT_SUIDDIR) { 1053 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1054 if (error) 1055 return (error); 1056 } 1057 /* 1058 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1059 */ 1060 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1061 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1062 fsflags |= MNT_NOSUID | MNT_USER; 1063 } 1064 1065 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1066 vfsp = NULL; 1067 if ((fsflags & MNT_UPDATE) == 0) { 1068 /* Don't try to load KLDs if we're mounting the root. */ 1069 if (fsflags & MNT_ROOTFS) 1070 vfsp = vfs_byname(fstype); 1071 else 1072 vfsp = vfs_byname_kld(fstype, td, &error); 1073 if (vfsp == NULL) 1074 return (ENODEV); 1075 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1076 return (EPERM); 1077 } 1078 1079 /* 1080 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1081 */ 1082 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1083 UIO_SYSSPACE, fspath, td); 1084 error = namei(&nd); 1085 if (error != 0) 1086 return (error); 1087 if (!NDHASGIANT(&nd)) 1088 mtx_lock(&Giant); 1089 NDFREE(&nd, NDF_ONLY_PNBUF); 1090 vp = nd.ni_vp; 1091 if ((fsflags & MNT_UPDATE) == 0) { 1092 error = vfs_domount_first(td, vfsp, fspath, vp, fsflags, 1093 optlist); 1094 } else { 1095 error = vfs_domount_update(td, vp, fsflags, optlist); 1096 } 1097 mtx_unlock(&Giant); 1098 1099 ASSERT_VI_UNLOCKED(vp, __func__); 1100 ASSERT_VOP_UNLOCKED(vp, __func__); 1101 1102 return (error); 1103 } 1104 1105 /* 1106 * Unmount a filesystem. 1107 * 1108 * Note: unmount takes a path to the vnode mounted on as argument, not 1109 * special file (as before). 1110 */ 1111 #ifndef _SYS_SYSPROTO_H_ 1112 struct unmount_args { 1113 char *path; 1114 int flags; 1115 }; 1116 #endif 1117 /* ARGSUSED */ 1118 int 1119 unmount(td, uap) 1120 struct thread *td; 1121 register struct unmount_args /* { 1122 char *path; 1123 int flags; 1124 } */ *uap; 1125 { 1126 struct mount *mp; 1127 char *pathbuf; 1128 int error, id0, id1; 1129 1130 AUDIT_ARG_VALUE(uap->flags); 1131 if (jailed(td->td_ucred) || usermount == 0) { 1132 error = priv_check(td, PRIV_VFS_UNMOUNT); 1133 if (error) 1134 return (error); 1135 } 1136 1137 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1138 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1139 if (error) { 1140 free(pathbuf, M_TEMP); 1141 return (error); 1142 } 1143 mtx_lock(&Giant); 1144 if (uap->flags & MNT_BYFSID) { 1145 AUDIT_ARG_TEXT(pathbuf); 1146 /* Decode the filesystem ID. */ 1147 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1148 mtx_unlock(&Giant); 1149 free(pathbuf, M_TEMP); 1150 return (EINVAL); 1151 } 1152 1153 mtx_lock(&mountlist_mtx); 1154 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1155 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1156 mp->mnt_stat.f_fsid.val[1] == id1) 1157 break; 1158 } 1159 mtx_unlock(&mountlist_mtx); 1160 } else { 1161 AUDIT_ARG_UPATH1(td, pathbuf); 1162 mtx_lock(&mountlist_mtx); 1163 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1164 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1165 break; 1166 } 1167 mtx_unlock(&mountlist_mtx); 1168 } 1169 free(pathbuf, M_TEMP); 1170 if (mp == NULL) { 1171 /* 1172 * Previously we returned ENOENT for a nonexistent path and 1173 * EINVAL for a non-mountpoint. We cannot tell these apart 1174 * now, so in the !MNT_BYFSID case return the more likely 1175 * EINVAL for compatibility. 1176 */ 1177 mtx_unlock(&Giant); 1178 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1179 } 1180 1181 /* 1182 * Don't allow unmounting the root filesystem. 1183 */ 1184 if (mp->mnt_flag & MNT_ROOTFS) { 1185 mtx_unlock(&Giant); 1186 return (EINVAL); 1187 } 1188 error = dounmount(mp, uap->flags, td); 1189 mtx_unlock(&Giant); 1190 return (error); 1191 } 1192 1193 /* 1194 * Do the actual filesystem unmount. 1195 */ 1196 int 1197 dounmount(mp, flags, td) 1198 struct mount *mp; 1199 int flags; 1200 struct thread *td; 1201 { 1202 struct vnode *coveredvp, *fsrootvp; 1203 int error; 1204 int async_flag; 1205 int mnt_gen_r; 1206 1207 mtx_assert(&Giant, MA_OWNED); 1208 1209 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1210 mnt_gen_r = mp->mnt_gen; 1211 VI_LOCK(coveredvp); 1212 vholdl(coveredvp); 1213 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1214 vdrop(coveredvp); 1215 /* 1216 * Check for mp being unmounted while waiting for the 1217 * covered vnode lock. 1218 */ 1219 if (coveredvp->v_mountedhere != mp || 1220 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1221 VOP_UNLOCK(coveredvp, 0); 1222 return (EBUSY); 1223 } 1224 } 1225 /* 1226 * Only privileged root, or (if MNT_USER is set) the user that did the 1227 * original mount is permitted to unmount this filesystem. 1228 */ 1229 error = vfs_suser(mp, td); 1230 if (error) { 1231 if (coveredvp) 1232 VOP_UNLOCK(coveredvp, 0); 1233 return (error); 1234 } 1235 1236 MNT_ILOCK(mp); 1237 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1238 MNT_IUNLOCK(mp); 1239 if (coveredvp) 1240 VOP_UNLOCK(coveredvp, 0); 1241 return (EBUSY); 1242 } 1243 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1244 /* Allow filesystems to detect that a forced unmount is in progress. */ 1245 if (flags & MNT_FORCE) 1246 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1247 error = 0; 1248 if (mp->mnt_lockref) { 1249 if ((flags & MNT_FORCE) == 0) { 1250 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ | 1251 MNTK_UNMOUNTF); 1252 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1253 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1254 wakeup(mp); 1255 } 1256 MNT_IUNLOCK(mp); 1257 if (coveredvp) 1258 VOP_UNLOCK(coveredvp, 0); 1259 return (EBUSY); 1260 } 1261 mp->mnt_kern_flag |= MNTK_DRAINING; 1262 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1263 "mount drain", 0); 1264 } 1265 MNT_IUNLOCK(mp); 1266 KASSERT(mp->mnt_lockref == 0, 1267 ("%s: invalid lock refcount in the drain path @ %s:%d", 1268 __func__, __FILE__, __LINE__)); 1269 KASSERT(error == 0, 1270 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1271 __func__, __FILE__, __LINE__)); 1272 vn_start_write(NULL, &mp, V_WAIT); 1273 1274 if (mp->mnt_flag & MNT_EXPUBLIC) 1275 vfs_setpublicfs(NULL, NULL, NULL); 1276 1277 vfs_msync(mp, MNT_WAIT); 1278 MNT_ILOCK(mp); 1279 async_flag = mp->mnt_flag & MNT_ASYNC; 1280 mp->mnt_flag &= ~MNT_ASYNC; 1281 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1282 MNT_IUNLOCK(mp); 1283 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1284 vfs_deallocate_syncvnode(mp); 1285 /* 1286 * For forced unmounts, move process cdir/rdir refs on the fs root 1287 * vnode to the covered vnode. For non-forced unmounts we want 1288 * such references to cause an EBUSY error. 1289 */ 1290 if ((flags & MNT_FORCE) && 1291 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1292 if (mp->mnt_vnodecovered != NULL) 1293 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1294 if (fsrootvp == rootvnode) { 1295 vrele(rootvnode); 1296 rootvnode = NULL; 1297 } 1298 vput(fsrootvp); 1299 } 1300 if (((mp->mnt_flag & MNT_RDONLY) || 1301 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1302 error = VFS_UNMOUNT(mp, flags); 1303 vn_finished_write(mp); 1304 /* 1305 * If we failed to flush the dirty blocks for this mount point, 1306 * undo all the cdir/rdir and rootvnode changes we made above. 1307 * Unless we failed to do so because the device is reporting that 1308 * it doesn't exist anymore. 1309 */ 1310 if (error && error != ENXIO) { 1311 if ((flags & MNT_FORCE) && 1312 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1313 if (mp->mnt_vnodecovered != NULL) 1314 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1315 if (rootvnode == NULL) { 1316 rootvnode = fsrootvp; 1317 vref(rootvnode); 1318 } 1319 vput(fsrootvp); 1320 } 1321 MNT_ILOCK(mp); 1322 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1323 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1324 MNT_IUNLOCK(mp); 1325 vfs_allocate_syncvnode(mp); 1326 MNT_ILOCK(mp); 1327 } 1328 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1329 mp->mnt_flag |= async_flag; 1330 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1331 mp->mnt_kern_flag |= MNTK_ASYNC; 1332 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1333 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1334 wakeup(mp); 1335 } 1336 MNT_IUNLOCK(mp); 1337 if (coveredvp) 1338 VOP_UNLOCK(coveredvp, 0); 1339 return (error); 1340 } 1341 mtx_lock(&mountlist_mtx); 1342 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1343 mtx_unlock(&mountlist_mtx); 1344 if (coveredvp != NULL) { 1345 coveredvp->v_mountedhere = NULL; 1346 vput(coveredvp); 1347 } 1348 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1349 vfs_mount_destroy(mp); 1350 return (0); 1351 } 1352 1353 /* 1354 * Report errors during filesystem mounting. 1355 */ 1356 void 1357 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1358 { 1359 struct vfsoptlist *moptlist = mp->mnt_optnew; 1360 va_list ap; 1361 int error, len; 1362 char *errmsg; 1363 1364 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1365 if (error || errmsg == NULL || len <= 0) 1366 return; 1367 1368 va_start(ap, fmt); 1369 vsnprintf(errmsg, (size_t)len, fmt, ap); 1370 va_end(ap); 1371 } 1372 1373 void 1374 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1375 { 1376 va_list ap; 1377 int error, len; 1378 char *errmsg; 1379 1380 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1381 if (error || errmsg == NULL || len <= 0) 1382 return; 1383 1384 va_start(ap, fmt); 1385 vsnprintf(errmsg, (size_t)len, fmt, ap); 1386 va_end(ap); 1387 } 1388 1389 /* 1390 * --------------------------------------------------------------------- 1391 * Functions for querying mount options/arguments from filesystems. 1392 */ 1393 1394 /* 1395 * Check that no unknown options are given 1396 */ 1397 int 1398 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1399 { 1400 struct vfsopt *opt; 1401 char errmsg[255]; 1402 const char **t, *p, *q; 1403 int ret = 0; 1404 1405 TAILQ_FOREACH(opt, opts, link) { 1406 p = opt->name; 1407 q = NULL; 1408 if (p[0] == 'n' && p[1] == 'o') 1409 q = p + 2; 1410 for(t = global_opts; *t != NULL; t++) { 1411 if (strcmp(*t, p) == 0) 1412 break; 1413 if (q != NULL) { 1414 if (strcmp(*t, q) == 0) 1415 break; 1416 } 1417 } 1418 if (*t != NULL) 1419 continue; 1420 for(t = legal; *t != NULL; t++) { 1421 if (strcmp(*t, p) == 0) 1422 break; 1423 if (q != NULL) { 1424 if (strcmp(*t, q) == 0) 1425 break; 1426 } 1427 } 1428 if (*t != NULL) 1429 continue; 1430 snprintf(errmsg, sizeof(errmsg), 1431 "mount option <%s> is unknown", p); 1432 ret = EINVAL; 1433 } 1434 if (ret != 0) { 1435 TAILQ_FOREACH(opt, opts, link) { 1436 if (strcmp(opt->name, "errmsg") == 0) { 1437 strncpy((char *)opt->value, errmsg, opt->len); 1438 break; 1439 } 1440 } 1441 if (opt == NULL) 1442 printf("%s\n", errmsg); 1443 } 1444 return (ret); 1445 } 1446 1447 /* 1448 * Get a mount option by its name. 1449 * 1450 * Return 0 if the option was found, ENOENT otherwise. 1451 * If len is non-NULL it will be filled with the length 1452 * of the option. If buf is non-NULL, it will be filled 1453 * with the address of the option. 1454 */ 1455 int 1456 vfs_getopt(opts, name, buf, len) 1457 struct vfsoptlist *opts; 1458 const char *name; 1459 void **buf; 1460 int *len; 1461 { 1462 struct vfsopt *opt; 1463 1464 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1465 1466 TAILQ_FOREACH(opt, opts, link) { 1467 if (strcmp(name, opt->name) == 0) { 1468 opt->seen = 1; 1469 if (len != NULL) 1470 *len = opt->len; 1471 if (buf != NULL) 1472 *buf = opt->value; 1473 return (0); 1474 } 1475 } 1476 return (ENOENT); 1477 } 1478 1479 int 1480 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1481 { 1482 struct vfsopt *opt; 1483 1484 if (opts == NULL) 1485 return (-1); 1486 1487 TAILQ_FOREACH(opt, opts, link) { 1488 if (strcmp(name, opt->name) == 0) { 1489 opt->seen = 1; 1490 return (opt->pos); 1491 } 1492 } 1493 return (-1); 1494 } 1495 1496 char * 1497 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1498 { 1499 struct vfsopt *opt; 1500 1501 *error = 0; 1502 TAILQ_FOREACH(opt, opts, link) { 1503 if (strcmp(name, opt->name) != 0) 1504 continue; 1505 opt->seen = 1; 1506 if (opt->len == 0 || 1507 ((char *)opt->value)[opt->len - 1] != '\0') { 1508 *error = EINVAL; 1509 return (NULL); 1510 } 1511 return (opt->value); 1512 } 1513 *error = ENOENT; 1514 return (NULL); 1515 } 1516 1517 int 1518 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1519 { 1520 struct vfsopt *opt; 1521 1522 TAILQ_FOREACH(opt, opts, link) { 1523 if (strcmp(name, opt->name) == 0) { 1524 opt->seen = 1; 1525 if (w != NULL) 1526 *w |= val; 1527 return (1); 1528 } 1529 } 1530 if (w != NULL) 1531 *w &= ~val; 1532 return (0); 1533 } 1534 1535 int 1536 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1537 { 1538 va_list ap; 1539 struct vfsopt *opt; 1540 int ret; 1541 1542 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1543 1544 TAILQ_FOREACH(opt, opts, link) { 1545 if (strcmp(name, opt->name) != 0) 1546 continue; 1547 opt->seen = 1; 1548 if (opt->len == 0 || opt->value == NULL) 1549 return (0); 1550 if (((char *)opt->value)[opt->len - 1] != '\0') 1551 return (0); 1552 va_start(ap, fmt); 1553 ret = vsscanf(opt->value, fmt, ap); 1554 va_end(ap); 1555 return (ret); 1556 } 1557 return (0); 1558 } 1559 1560 int 1561 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1562 { 1563 struct vfsopt *opt; 1564 1565 TAILQ_FOREACH(opt, opts, link) { 1566 if (strcmp(name, opt->name) != 0) 1567 continue; 1568 opt->seen = 1; 1569 if (opt->value == NULL) 1570 opt->len = len; 1571 else { 1572 if (opt->len != len) 1573 return (EINVAL); 1574 bcopy(value, opt->value, len); 1575 } 1576 return (0); 1577 } 1578 return (ENOENT); 1579 } 1580 1581 int 1582 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1583 { 1584 struct vfsopt *opt; 1585 1586 TAILQ_FOREACH(opt, opts, link) { 1587 if (strcmp(name, opt->name) != 0) 1588 continue; 1589 opt->seen = 1; 1590 if (opt->value == NULL) 1591 opt->len = len; 1592 else { 1593 if (opt->len < len) 1594 return (EINVAL); 1595 opt->len = len; 1596 bcopy(value, opt->value, len); 1597 } 1598 return (0); 1599 } 1600 return (ENOENT); 1601 } 1602 1603 int 1604 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1605 { 1606 struct vfsopt *opt; 1607 1608 TAILQ_FOREACH(opt, opts, link) { 1609 if (strcmp(name, opt->name) != 0) 1610 continue; 1611 opt->seen = 1; 1612 if (opt->value == NULL) 1613 opt->len = strlen(value) + 1; 1614 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1615 return (EINVAL); 1616 return (0); 1617 } 1618 return (ENOENT); 1619 } 1620 1621 /* 1622 * Find and copy a mount option. 1623 * 1624 * The size of the buffer has to be specified 1625 * in len, if it is not the same length as the 1626 * mount option, EINVAL is returned. 1627 * Returns ENOENT if the option is not found. 1628 */ 1629 int 1630 vfs_copyopt(opts, name, dest, len) 1631 struct vfsoptlist *opts; 1632 const char *name; 1633 void *dest; 1634 int len; 1635 { 1636 struct vfsopt *opt; 1637 1638 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1639 1640 TAILQ_FOREACH(opt, opts, link) { 1641 if (strcmp(name, opt->name) == 0) { 1642 opt->seen = 1; 1643 if (len != opt->len) 1644 return (EINVAL); 1645 bcopy(opt->value, dest, opt->len); 1646 return (0); 1647 } 1648 } 1649 return (ENOENT); 1650 } 1651 1652 /* 1653 * This is a helper function for filesystems to traverse their 1654 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1655 */ 1656 1657 struct vnode * 1658 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1659 { 1660 struct vnode *vp; 1661 1662 mtx_assert(MNT_MTX(mp), MA_OWNED); 1663 1664 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1665 if (should_yield()) { 1666 MNT_IUNLOCK(mp); 1667 kern_yield(-1); 1668 MNT_ILOCK(mp); 1669 } 1670 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1671 while (vp != NULL && vp->v_type == VMARKER) 1672 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1673 1674 /* Check if we are done */ 1675 if (vp == NULL) { 1676 __mnt_vnode_markerfree(mvp, mp); 1677 return (NULL); 1678 } 1679 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1680 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1681 return (vp); 1682 } 1683 1684 struct vnode * 1685 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1686 { 1687 struct vnode *vp; 1688 1689 mtx_assert(MNT_MTX(mp), MA_OWNED); 1690 1691 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1692 while (vp != NULL && vp->v_type == VMARKER) 1693 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1694 1695 /* Check if we are done */ 1696 if (vp == NULL) { 1697 *mvp = NULL; 1698 return (NULL); 1699 } 1700 MNT_REF(mp); 1701 MNT_IUNLOCK(mp); 1702 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1703 M_VNODE_MARKER, 1704 M_WAITOK | M_ZERO); 1705 MNT_ILOCK(mp); 1706 (*mvp)->v_type = VMARKER; 1707 1708 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1709 while (vp != NULL && vp->v_type == VMARKER) 1710 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1711 1712 /* Check if we are done */ 1713 if (vp == NULL) { 1714 MNT_IUNLOCK(mp); 1715 free(*mvp, M_VNODE_MARKER); 1716 MNT_ILOCK(mp); 1717 *mvp = NULL; 1718 MNT_REL(mp); 1719 return (NULL); 1720 } 1721 (*mvp)->v_mount = mp; 1722 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1723 return (vp); 1724 } 1725 1726 1727 void 1728 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1729 { 1730 1731 if (*mvp == NULL) 1732 return; 1733 1734 mtx_assert(MNT_MTX(mp), MA_OWNED); 1735 1736 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1737 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1738 MNT_IUNLOCK(mp); 1739 free(*mvp, M_VNODE_MARKER); 1740 MNT_ILOCK(mp); 1741 *mvp = NULL; 1742 MNT_REL(mp); 1743 } 1744 1745 1746 int 1747 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1748 { 1749 int error; 1750 1751 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1752 if (sbp != &mp->mnt_stat) 1753 *sbp = mp->mnt_stat; 1754 return (error); 1755 } 1756 1757 void 1758 vfs_mountedfrom(struct mount *mp, const char *from) 1759 { 1760 1761 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1762 strlcpy(mp->mnt_stat.f_mntfromname, from, 1763 sizeof mp->mnt_stat.f_mntfromname); 1764 } 1765 1766 /* 1767 * --------------------------------------------------------------------- 1768 * This is the api for building mount args and mounting filesystems from 1769 * inside the kernel. 1770 * 1771 * The API works by accumulation of individual args. First error is 1772 * latched. 1773 * 1774 * XXX: should be documented in new manpage kernel_mount(9) 1775 */ 1776 1777 /* A memory allocation which must be freed when we are done */ 1778 struct mntaarg { 1779 SLIST_ENTRY(mntaarg) next; 1780 }; 1781 1782 /* The header for the mount arguments */ 1783 struct mntarg { 1784 struct iovec *v; 1785 int len; 1786 int error; 1787 SLIST_HEAD(, mntaarg) list; 1788 }; 1789 1790 /* 1791 * Add a boolean argument. 1792 * 1793 * flag is the boolean value. 1794 * name must start with "no". 1795 */ 1796 struct mntarg * 1797 mount_argb(struct mntarg *ma, int flag, const char *name) 1798 { 1799 1800 KASSERT(name[0] == 'n' && name[1] == 'o', 1801 ("mount_argb(...,%s): name must start with 'no'", name)); 1802 1803 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1804 } 1805 1806 /* 1807 * Add an argument printf style 1808 */ 1809 struct mntarg * 1810 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1811 { 1812 va_list ap; 1813 struct mntaarg *maa; 1814 struct sbuf *sb; 1815 int len; 1816 1817 if (ma == NULL) { 1818 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1819 SLIST_INIT(&ma->list); 1820 } 1821 if (ma->error) 1822 return (ma); 1823 1824 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1825 M_MOUNT, M_WAITOK); 1826 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1827 ma->v[ma->len].iov_len = strlen(name) + 1; 1828 ma->len++; 1829 1830 sb = sbuf_new_auto(); 1831 va_start(ap, fmt); 1832 sbuf_vprintf(sb, fmt, ap); 1833 va_end(ap); 1834 sbuf_finish(sb); 1835 len = sbuf_len(sb) + 1; 1836 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1837 SLIST_INSERT_HEAD(&ma->list, maa, next); 1838 bcopy(sbuf_data(sb), maa + 1, len); 1839 sbuf_delete(sb); 1840 1841 ma->v[ma->len].iov_base = maa + 1; 1842 ma->v[ma->len].iov_len = len; 1843 ma->len++; 1844 1845 return (ma); 1846 } 1847 1848 /* 1849 * Add an argument which is a userland string. 1850 */ 1851 struct mntarg * 1852 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1853 { 1854 struct mntaarg *maa; 1855 char *tbuf; 1856 1857 if (val == NULL) 1858 return (ma); 1859 if (ma == NULL) { 1860 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1861 SLIST_INIT(&ma->list); 1862 } 1863 if (ma->error) 1864 return (ma); 1865 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1866 SLIST_INSERT_HEAD(&ma->list, maa, next); 1867 tbuf = (void *)(maa + 1); 1868 ma->error = copyinstr(val, tbuf, len, NULL); 1869 return (mount_arg(ma, name, tbuf, -1)); 1870 } 1871 1872 /* 1873 * Plain argument. 1874 * 1875 * If length is -1, treat value as a C string. 1876 */ 1877 struct mntarg * 1878 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1879 { 1880 1881 if (ma == NULL) { 1882 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1883 SLIST_INIT(&ma->list); 1884 } 1885 if (ma->error) 1886 return (ma); 1887 1888 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1889 M_MOUNT, M_WAITOK); 1890 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1891 ma->v[ma->len].iov_len = strlen(name) + 1; 1892 ma->len++; 1893 1894 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1895 if (len < 0) 1896 ma->v[ma->len].iov_len = strlen(val) + 1; 1897 else 1898 ma->v[ma->len].iov_len = len; 1899 ma->len++; 1900 return (ma); 1901 } 1902 1903 /* 1904 * Free a mntarg structure 1905 */ 1906 static void 1907 free_mntarg(struct mntarg *ma) 1908 { 1909 struct mntaarg *maa; 1910 1911 while (!SLIST_EMPTY(&ma->list)) { 1912 maa = SLIST_FIRST(&ma->list); 1913 SLIST_REMOVE_HEAD(&ma->list, next); 1914 free(maa, M_MOUNT); 1915 } 1916 free(ma->v, M_MOUNT); 1917 free(ma, M_MOUNT); 1918 } 1919 1920 /* 1921 * Mount a filesystem 1922 */ 1923 int 1924 kernel_mount(struct mntarg *ma, int flags) 1925 { 1926 struct uio auio; 1927 int error; 1928 1929 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1930 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1931 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1932 1933 auio.uio_iov = ma->v; 1934 auio.uio_iovcnt = ma->len; 1935 auio.uio_segflg = UIO_SYSSPACE; 1936 1937 error = ma->error; 1938 if (!error) 1939 error = vfs_donmount(curthread, flags, &auio); 1940 free_mntarg(ma); 1941 return (error); 1942 } 1943 1944 /* 1945 * A printflike function to mount a filesystem. 1946 */ 1947 int 1948 kernel_vmount(int flags, ...) 1949 { 1950 struct mntarg *ma = NULL; 1951 va_list ap; 1952 const char *cp; 1953 const void *vp; 1954 int error; 1955 1956 va_start(ap, flags); 1957 for (;;) { 1958 cp = va_arg(ap, const char *); 1959 if (cp == NULL) 1960 break; 1961 vp = va_arg(ap, const void *); 1962 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1963 } 1964 va_end(ap); 1965 1966 error = kernel_mount(ma, flags); 1967 return (error); 1968 } 1969 1970 void 1971 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1972 { 1973 1974 bcopy(oexp, exp, sizeof(*oexp)); 1975 exp->ex_numsecflavors = 0; 1976 } 1977