1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/fcntl.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/filedesc.h> 53 #include <sys/reboot.h> 54 #include <sys/sbuf.h> 55 #include <sys/syscallsubr.h> 56 #include <sys/sysproto.h> 57 #include <sys/sx.h> 58 #include <sys/sysctl.h> 59 #include <sys/sysent.h> 60 #include <sys/systm.h> 61 #include <sys/vnode.h> 62 #include <vm/uma.h> 63 64 #include <geom/geom.h> 65 66 #include <machine/stdarg.h> 67 68 #include <security/audit/audit.h> 69 #include <security/mac/mac_framework.h> 70 71 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 72 73 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 74 uint64_t fsflags, struct vfsoptlist **optlist); 75 static void free_mntarg(struct mntarg *ma); 76 77 static int usermount = 0; 78 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 79 "Unprivileged users may mount and unmount file systems"); 80 81 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 82 static uma_zone_t mount_zone; 83 84 /* List of mounted filesystems. */ 85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87 /* For any iteration/modification of mountlist */ 88 struct mtx mountlist_mtx; 89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91 /* 92 * Global opts, taken by all filesystems 93 */ 94 static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103 }; 104 105 static int 106 mount_init(void *mem, int size, int flags) 107 { 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF); 113 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 114 return (0); 115 } 116 117 static void 118 mount_fini(void *mem, int size) 119 { 120 struct mount *mp; 121 122 mp = (struct mount *)mem; 123 lockdestroy(&mp->mnt_explock); 124 mtx_destroy(&mp->mnt_listmtx); 125 mtx_destroy(&mp->mnt_mtx); 126 } 127 128 static void 129 vfs_mount_init(void *dummy __unused) 130 { 131 132 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 133 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 134 } 135 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 136 137 /* 138 * --------------------------------------------------------------------- 139 * Functions for building and sanitizing the mount options 140 */ 141 142 /* Remove one mount option. */ 143 static void 144 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 145 { 146 147 TAILQ_REMOVE(opts, opt, link); 148 free(opt->name, M_MOUNT); 149 if (opt->value != NULL) 150 free(opt->value, M_MOUNT); 151 free(opt, M_MOUNT); 152 } 153 154 /* Release all resources related to the mount options. */ 155 void 156 vfs_freeopts(struct vfsoptlist *opts) 157 { 158 struct vfsopt *opt; 159 160 while (!TAILQ_EMPTY(opts)) { 161 opt = TAILQ_FIRST(opts); 162 vfs_freeopt(opts, opt); 163 } 164 free(opts, M_MOUNT); 165 } 166 167 void 168 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 169 { 170 struct vfsopt *opt, *temp; 171 172 if (opts == NULL) 173 return; 174 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 175 if (strcmp(opt->name, name) == 0) 176 vfs_freeopt(opts, opt); 177 } 178 } 179 180 static int 181 vfs_isopt_ro(const char *opt) 182 { 183 184 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 185 strcmp(opt, "norw") == 0) 186 return (1); 187 return (0); 188 } 189 190 static int 191 vfs_isopt_rw(const char *opt) 192 { 193 194 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 195 return (1); 196 return (0); 197 } 198 199 /* 200 * Check if options are equal (with or without the "no" prefix). 201 */ 202 static int 203 vfs_equalopts(const char *opt1, const char *opt2) 204 { 205 char *p; 206 207 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 208 if (strcmp(opt1, opt2) == 0) 209 return (1); 210 /* "noopt" vs. "opt" */ 211 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 212 return (1); 213 /* "opt" vs. "noopt" */ 214 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 215 return (1); 216 while ((p = strchr(opt1, '.')) != NULL && 217 !strncmp(opt1, opt2, ++p - opt1)) { 218 opt2 += p - opt1; 219 opt1 = p; 220 /* "foo.noopt" vs. "foo.opt" */ 221 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 222 return (1); 223 /* "foo.opt" vs. "foo.noopt" */ 224 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 225 return (1); 226 } 227 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 228 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 229 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 230 return (1); 231 return (0); 232 } 233 234 /* 235 * If a mount option is specified several times, 236 * (with or without the "no" prefix) only keep 237 * the last occurrence of it. 238 */ 239 static void 240 vfs_sanitizeopts(struct vfsoptlist *opts) 241 { 242 struct vfsopt *opt, *opt2, *tmp; 243 244 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 245 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 246 while (opt2 != NULL) { 247 if (vfs_equalopts(opt->name, opt2->name)) { 248 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 249 vfs_freeopt(opts, opt2); 250 opt2 = tmp; 251 } else { 252 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 253 } 254 } 255 } 256 } 257 258 /* 259 * Build a linked list of mount options from a struct uio. 260 */ 261 int 262 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 263 { 264 struct vfsoptlist *opts; 265 struct vfsopt *opt; 266 size_t memused, namelen, optlen; 267 unsigned int i, iovcnt; 268 int error; 269 270 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 271 TAILQ_INIT(opts); 272 memused = 0; 273 iovcnt = auio->uio_iovcnt; 274 for (i = 0; i < iovcnt; i += 2) { 275 namelen = auio->uio_iov[i].iov_len; 276 optlen = auio->uio_iov[i + 1].iov_len; 277 memused += sizeof(struct vfsopt) + optlen + namelen; 278 /* 279 * Avoid consuming too much memory, and attempts to overflow 280 * memused. 281 */ 282 if (memused > VFS_MOUNTARG_SIZE_MAX || 283 optlen > VFS_MOUNTARG_SIZE_MAX || 284 namelen > VFS_MOUNTARG_SIZE_MAX) { 285 error = EINVAL; 286 goto bad; 287 } 288 289 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 290 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 291 opt->value = NULL; 292 opt->len = 0; 293 opt->pos = i / 2; 294 opt->seen = 0; 295 296 /* 297 * Do this early, so jumps to "bad" will free the current 298 * option. 299 */ 300 TAILQ_INSERT_TAIL(opts, opt, link); 301 302 if (auio->uio_segflg == UIO_SYSSPACE) { 303 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 304 } else { 305 error = copyin(auio->uio_iov[i].iov_base, opt->name, 306 namelen); 307 if (error) 308 goto bad; 309 } 310 /* Ensure names are null-terminated strings. */ 311 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 312 error = EINVAL; 313 goto bad; 314 } 315 if (optlen != 0) { 316 opt->len = optlen; 317 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 318 if (auio->uio_segflg == UIO_SYSSPACE) { 319 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 320 optlen); 321 } else { 322 error = copyin(auio->uio_iov[i + 1].iov_base, 323 opt->value, optlen); 324 if (error) 325 goto bad; 326 } 327 } 328 } 329 vfs_sanitizeopts(opts); 330 *options = opts; 331 return (0); 332 bad: 333 vfs_freeopts(opts); 334 return (error); 335 } 336 337 /* 338 * Merge the old mount options with the new ones passed 339 * in the MNT_UPDATE case. 340 * 341 * XXX: This function will keep a "nofoo" option in the new 342 * options. E.g, if the option's canonical name is "foo", 343 * "nofoo" ends up in the mount point's active options. 344 */ 345 static void 346 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 347 { 348 struct vfsopt *opt, *new; 349 350 TAILQ_FOREACH(opt, oldopts, link) { 351 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 352 new->name = strdup(opt->name, M_MOUNT); 353 if (opt->len != 0) { 354 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 355 bcopy(opt->value, new->value, opt->len); 356 } else 357 new->value = NULL; 358 new->len = opt->len; 359 new->seen = opt->seen; 360 TAILQ_INSERT_HEAD(toopts, new, link); 361 } 362 vfs_sanitizeopts(toopts); 363 } 364 365 /* 366 * Mount a filesystem. 367 */ 368 int 369 sys_nmount(td, uap) 370 struct thread *td; 371 struct nmount_args /* { 372 struct iovec *iovp; 373 unsigned int iovcnt; 374 int flags; 375 } */ *uap; 376 { 377 struct uio *auio; 378 int error; 379 u_int iovcnt; 380 uint64_t flags; 381 382 /* 383 * Mount flags are now 64-bits. On 32-bit archtectures only 384 * 32-bits are passed in, but from here on everything handles 385 * 64-bit flags correctly. 386 */ 387 flags = uap->flags; 388 389 AUDIT_ARG_FFLAGS(flags); 390 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 391 uap->iovp, uap->iovcnt, flags); 392 393 /* 394 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 395 * userspace to set this flag, but we must filter it out if we want 396 * MNT_UPDATE on the root file system to work. 397 * MNT_ROOTFS should only be set by the kernel when mounting its 398 * root file system. 399 */ 400 flags &= ~MNT_ROOTFS; 401 402 iovcnt = uap->iovcnt; 403 /* 404 * Check that we have an even number of iovec's 405 * and that we have at least two options. 406 */ 407 if ((iovcnt & 1) || (iovcnt < 4)) { 408 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 409 uap->iovcnt); 410 return (EINVAL); 411 } 412 413 error = copyinuio(uap->iovp, iovcnt, &auio); 414 if (error) { 415 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 416 __func__, error); 417 return (error); 418 } 419 error = vfs_donmount(td, flags, auio); 420 421 free(auio, M_IOV); 422 return (error); 423 } 424 425 /* 426 * --------------------------------------------------------------------- 427 * Various utility functions 428 */ 429 430 void 431 vfs_ref(struct mount *mp) 432 { 433 434 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 435 MNT_ILOCK(mp); 436 MNT_REF(mp); 437 MNT_IUNLOCK(mp); 438 } 439 440 void 441 vfs_rel(struct mount *mp) 442 { 443 444 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 445 MNT_ILOCK(mp); 446 MNT_REL(mp); 447 MNT_IUNLOCK(mp); 448 } 449 450 /* 451 * Allocate and initialize the mount point struct. 452 */ 453 struct mount * 454 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 455 struct ucred *cred) 456 { 457 struct mount *mp; 458 459 mp = uma_zalloc(mount_zone, M_WAITOK); 460 bzero(&mp->mnt_startzero, 461 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 462 TAILQ_INIT(&mp->mnt_nvnodelist); 463 mp->mnt_nvnodelistsize = 0; 464 TAILQ_INIT(&mp->mnt_activevnodelist); 465 mp->mnt_activevnodelistsize = 0; 466 TAILQ_INIT(&mp->mnt_tmpfreevnodelist); 467 mp->mnt_tmpfreevnodelistsize = 0; 468 mp->mnt_ref = 0; 469 (void) vfs_busy(mp, MBF_NOWAIT); 470 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 471 mp->mnt_op = vfsp->vfc_vfsops; 472 mp->mnt_vfc = vfsp; 473 mp->mnt_stat.f_type = vfsp->vfc_typenum; 474 mp->mnt_gen++; 475 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 476 mp->mnt_vnodecovered = vp; 477 mp->mnt_cred = crdup(cred); 478 mp->mnt_stat.f_owner = cred->cr_uid; 479 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 480 mp->mnt_iosize_max = DFLTPHYS; 481 #ifdef MAC 482 mac_mount_init(mp); 483 mac_mount_create(cred, mp); 484 #endif 485 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 486 TAILQ_INIT(&mp->mnt_uppers); 487 return (mp); 488 } 489 490 /* 491 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 492 */ 493 void 494 vfs_mount_destroy(struct mount *mp) 495 { 496 497 MNT_ILOCK(mp); 498 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 499 if (mp->mnt_kern_flag & MNTK_MWAIT) { 500 mp->mnt_kern_flag &= ~MNTK_MWAIT; 501 wakeup(mp); 502 } 503 while (mp->mnt_ref) 504 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 505 KASSERT(mp->mnt_ref == 0, 506 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 507 __FILE__, __LINE__)); 508 if (mp->mnt_writeopcount != 0) 509 panic("vfs_mount_destroy: nonzero writeopcount"); 510 if (mp->mnt_secondary_writes != 0) 511 panic("vfs_mount_destroy: nonzero secondary_writes"); 512 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 513 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 514 struct vnode *vp; 515 516 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 517 vn_printf(vp, "dangling vnode "); 518 panic("unmount: dangling vnode"); 519 } 520 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 521 if (mp->mnt_nvnodelistsize != 0) 522 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 523 if (mp->mnt_activevnodelistsize != 0) 524 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 525 if (mp->mnt_lockref != 0) 526 panic("vfs_mount_destroy: nonzero lock refcount"); 527 MNT_IUNLOCK(mp); 528 #ifdef MAC 529 mac_mount_destroy(mp); 530 #endif 531 if (mp->mnt_opt != NULL) 532 vfs_freeopts(mp->mnt_opt); 533 crfree(mp->mnt_cred); 534 uma_zfree(mount_zone, mp); 535 } 536 537 int 538 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 539 { 540 struct vfsoptlist *optlist; 541 struct vfsopt *opt, *tmp_opt; 542 char *fstype, *fspath, *errmsg; 543 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 544 545 errmsg = fspath = NULL; 546 errmsg_len = fspathlen = 0; 547 errmsg_pos = -1; 548 549 error = vfs_buildopts(fsoptions, &optlist); 550 if (error) 551 return (error); 552 553 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 554 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 555 556 /* 557 * We need these two options before the others, 558 * and they are mandatory for any filesystem. 559 * Ensure they are NUL terminated as well. 560 */ 561 fstypelen = 0; 562 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 563 if (error || fstype[fstypelen - 1] != '\0') { 564 error = EINVAL; 565 if (errmsg != NULL) 566 strncpy(errmsg, "Invalid fstype", errmsg_len); 567 goto bail; 568 } 569 fspathlen = 0; 570 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 571 if (error || fspath[fspathlen - 1] != '\0') { 572 error = EINVAL; 573 if (errmsg != NULL) 574 strncpy(errmsg, "Invalid fspath", errmsg_len); 575 goto bail; 576 } 577 578 /* 579 * We need to see if we have the "update" option 580 * before we call vfs_domount(), since vfs_domount() has special 581 * logic based on MNT_UPDATE. This is very important 582 * when we want to update the root filesystem. 583 */ 584 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 585 if (strcmp(opt->name, "update") == 0) { 586 fsflags |= MNT_UPDATE; 587 vfs_freeopt(optlist, opt); 588 } 589 else if (strcmp(opt->name, "async") == 0) 590 fsflags |= MNT_ASYNC; 591 else if (strcmp(opt->name, "force") == 0) { 592 fsflags |= MNT_FORCE; 593 vfs_freeopt(optlist, opt); 594 } 595 else if (strcmp(opt->name, "reload") == 0) { 596 fsflags |= MNT_RELOAD; 597 vfs_freeopt(optlist, opt); 598 } 599 else if (strcmp(opt->name, "multilabel") == 0) 600 fsflags |= MNT_MULTILABEL; 601 else if (strcmp(opt->name, "noasync") == 0) 602 fsflags &= ~MNT_ASYNC; 603 else if (strcmp(opt->name, "noatime") == 0) 604 fsflags |= MNT_NOATIME; 605 else if (strcmp(opt->name, "atime") == 0) { 606 free(opt->name, M_MOUNT); 607 opt->name = strdup("nonoatime", M_MOUNT); 608 } 609 else if (strcmp(opt->name, "noclusterr") == 0) 610 fsflags |= MNT_NOCLUSTERR; 611 else if (strcmp(opt->name, "clusterr") == 0) { 612 free(opt->name, M_MOUNT); 613 opt->name = strdup("nonoclusterr", M_MOUNT); 614 } 615 else if (strcmp(opt->name, "noclusterw") == 0) 616 fsflags |= MNT_NOCLUSTERW; 617 else if (strcmp(opt->name, "clusterw") == 0) { 618 free(opt->name, M_MOUNT); 619 opt->name = strdup("nonoclusterw", M_MOUNT); 620 } 621 else if (strcmp(opt->name, "noexec") == 0) 622 fsflags |= MNT_NOEXEC; 623 else if (strcmp(opt->name, "exec") == 0) { 624 free(opt->name, M_MOUNT); 625 opt->name = strdup("nonoexec", M_MOUNT); 626 } 627 else if (strcmp(opt->name, "nosuid") == 0) 628 fsflags |= MNT_NOSUID; 629 else if (strcmp(opt->name, "suid") == 0) { 630 free(opt->name, M_MOUNT); 631 opt->name = strdup("nonosuid", M_MOUNT); 632 } 633 else if (strcmp(opt->name, "nosymfollow") == 0) 634 fsflags |= MNT_NOSYMFOLLOW; 635 else if (strcmp(opt->name, "symfollow") == 0) { 636 free(opt->name, M_MOUNT); 637 opt->name = strdup("nonosymfollow", M_MOUNT); 638 } 639 else if (strcmp(opt->name, "noro") == 0) 640 fsflags &= ~MNT_RDONLY; 641 else if (strcmp(opt->name, "rw") == 0) 642 fsflags &= ~MNT_RDONLY; 643 else if (strcmp(opt->name, "ro") == 0) 644 fsflags |= MNT_RDONLY; 645 else if (strcmp(opt->name, "rdonly") == 0) { 646 free(opt->name, M_MOUNT); 647 opt->name = strdup("ro", M_MOUNT); 648 fsflags |= MNT_RDONLY; 649 } 650 else if (strcmp(opt->name, "suiddir") == 0) 651 fsflags |= MNT_SUIDDIR; 652 else if (strcmp(opt->name, "sync") == 0) 653 fsflags |= MNT_SYNCHRONOUS; 654 else if (strcmp(opt->name, "union") == 0) 655 fsflags |= MNT_UNION; 656 else if (strcmp(opt->name, "automounted") == 0) { 657 fsflags |= MNT_AUTOMOUNTED; 658 vfs_freeopt(optlist, opt); 659 } 660 } 661 662 /* 663 * Be ultra-paranoid about making sure the type and fspath 664 * variables will fit in our mp buffers, including the 665 * terminating NUL. 666 */ 667 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 668 error = ENAMETOOLONG; 669 goto bail; 670 } 671 672 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 673 bail: 674 /* copyout the errmsg */ 675 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 676 && errmsg_len > 0 && errmsg != NULL) { 677 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 678 bcopy(errmsg, 679 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 680 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 681 } else { 682 copyout(errmsg, 683 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 684 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 685 } 686 } 687 688 if (optlist != NULL) 689 vfs_freeopts(optlist); 690 return (error); 691 } 692 693 /* 694 * Old mount API. 695 */ 696 #ifndef _SYS_SYSPROTO_H_ 697 struct mount_args { 698 char *type; 699 char *path; 700 int flags; 701 caddr_t data; 702 }; 703 #endif 704 /* ARGSUSED */ 705 int 706 sys_mount(td, uap) 707 struct thread *td; 708 struct mount_args /* { 709 char *type; 710 char *path; 711 int flags; 712 caddr_t data; 713 } */ *uap; 714 { 715 char *fstype; 716 struct vfsconf *vfsp = NULL; 717 struct mntarg *ma = NULL; 718 uint64_t flags; 719 int error; 720 721 /* 722 * Mount flags are now 64-bits. On 32-bit architectures only 723 * 32-bits are passed in, but from here on everything handles 724 * 64-bit flags correctly. 725 */ 726 flags = uap->flags; 727 728 AUDIT_ARG_FFLAGS(flags); 729 730 /* 731 * Filter out MNT_ROOTFS. We do not want clients of mount() in 732 * userspace to set this flag, but we must filter it out if we want 733 * MNT_UPDATE on the root file system to work. 734 * MNT_ROOTFS should only be set by the kernel when mounting its 735 * root file system. 736 */ 737 flags &= ~MNT_ROOTFS; 738 739 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 740 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 741 if (error) { 742 free(fstype, M_TEMP); 743 return (error); 744 } 745 746 AUDIT_ARG_TEXT(fstype); 747 vfsp = vfs_byname_kld(fstype, td, &error); 748 free(fstype, M_TEMP); 749 if (vfsp == NULL) 750 return (ENOENT); 751 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 752 return (EOPNOTSUPP); 753 754 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 755 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 756 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 757 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 758 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 759 760 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 761 return (error); 762 } 763 764 /* 765 * vfs_domount_first(): first file system mount (not update) 766 */ 767 static int 768 vfs_domount_first( 769 struct thread *td, /* Calling thread. */ 770 struct vfsconf *vfsp, /* File system type. */ 771 char *fspath, /* Mount path. */ 772 struct vnode *vp, /* Vnode to be covered. */ 773 uint64_t fsflags, /* Flags common to all filesystems. */ 774 struct vfsoptlist **optlist /* Options local to the filesystem. */ 775 ) 776 { 777 struct vattr va; 778 struct mount *mp; 779 struct vnode *newdp; 780 int error; 781 782 ASSERT_VOP_ELOCKED(vp, __func__); 783 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 784 785 /* 786 * If the user is not root, ensure that they own the directory 787 * onto which we are attempting to mount. 788 */ 789 error = VOP_GETATTR(vp, &va, td->td_ucred); 790 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 791 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 792 if (error == 0) 793 error = vinvalbuf(vp, V_SAVE, 0, 0); 794 if (error == 0 && vp->v_type != VDIR) 795 error = ENOTDIR; 796 if (error == 0) { 797 VI_LOCK(vp); 798 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 799 vp->v_iflag |= VI_MOUNT; 800 else 801 error = EBUSY; 802 VI_UNLOCK(vp); 803 } 804 if (error != 0) { 805 vput(vp); 806 return (error); 807 } 808 VOP_UNLOCK(vp, 0); 809 810 /* Allocate and initialize the filesystem. */ 811 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 812 /* XXXMAC: pass to vfs_mount_alloc? */ 813 mp->mnt_optnew = *optlist; 814 /* Set the mount level flags. */ 815 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 816 817 /* 818 * Mount the filesystem. 819 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 820 * get. No freeing of cn_pnbuf. 821 */ 822 error = VFS_MOUNT(mp); 823 if (error != 0) { 824 vfs_unbusy(mp); 825 vfs_mount_destroy(mp); 826 VI_LOCK(vp); 827 vp->v_iflag &= ~VI_MOUNT; 828 VI_UNLOCK(vp); 829 vrele(vp); 830 return (error); 831 } 832 833 if (mp->mnt_opt != NULL) 834 vfs_freeopts(mp->mnt_opt); 835 mp->mnt_opt = mp->mnt_optnew; 836 *optlist = NULL; 837 (void)VFS_STATFS(mp, &mp->mnt_stat); 838 839 /* 840 * Prevent external consumers of mount options from reading mnt_optnew. 841 */ 842 mp->mnt_optnew = NULL; 843 844 MNT_ILOCK(mp); 845 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 846 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 847 mp->mnt_kern_flag |= MNTK_ASYNC; 848 else 849 mp->mnt_kern_flag &= ~MNTK_ASYNC; 850 MNT_IUNLOCK(mp); 851 852 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 853 cache_purge(vp); 854 VI_LOCK(vp); 855 vp->v_iflag &= ~VI_MOUNT; 856 VI_UNLOCK(vp); 857 vp->v_mountedhere = mp; 858 /* Place the new filesystem at the end of the mount list. */ 859 mtx_lock(&mountlist_mtx); 860 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 861 mtx_unlock(&mountlist_mtx); 862 vfs_event_signal(NULL, VQ_MOUNT, 0); 863 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 864 panic("mount: lost mount"); 865 VOP_UNLOCK(vp, 0); 866 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td); 867 VOP_UNLOCK(newdp, 0); 868 mountcheckdirs(vp, newdp); 869 vrele(newdp); 870 if ((mp->mnt_flag & MNT_RDONLY) == 0) 871 vfs_allocate_syncvnode(mp); 872 vfs_unbusy(mp); 873 return (0); 874 } 875 876 /* 877 * vfs_domount_update(): update of mounted file system 878 */ 879 static int 880 vfs_domount_update( 881 struct thread *td, /* Calling thread. */ 882 struct vnode *vp, /* Mount point vnode. */ 883 uint64_t fsflags, /* Flags common to all filesystems. */ 884 struct vfsoptlist **optlist /* Options local to the filesystem. */ 885 ) 886 { 887 struct export_args export; 888 void *bufp; 889 struct mount *mp; 890 int error, export_error, len; 891 uint64_t flag; 892 893 ASSERT_VOP_ELOCKED(vp, __func__); 894 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 895 mp = vp->v_mount; 896 897 if ((vp->v_vflag & VV_ROOT) == 0) { 898 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 899 == 0) 900 error = EXDEV; 901 else 902 error = EINVAL; 903 vput(vp); 904 return (error); 905 } 906 907 /* 908 * We only allow the filesystem to be reloaded if it 909 * is currently mounted read-only. 910 */ 911 flag = mp->mnt_flag; 912 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 913 vput(vp); 914 return (EOPNOTSUPP); /* Needs translation */ 915 } 916 /* 917 * Only privileged root, or (if MNT_USER is set) the user that 918 * did the original mount is permitted to update it. 919 */ 920 error = vfs_suser(mp, td); 921 if (error != 0) { 922 vput(vp); 923 return (error); 924 } 925 if (vfs_busy(mp, MBF_NOWAIT)) { 926 vput(vp); 927 return (EBUSY); 928 } 929 VI_LOCK(vp); 930 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 931 VI_UNLOCK(vp); 932 vfs_unbusy(mp); 933 vput(vp); 934 return (EBUSY); 935 } 936 vp->v_iflag |= VI_MOUNT; 937 VI_UNLOCK(vp); 938 VOP_UNLOCK(vp, 0); 939 940 MNT_ILOCK(mp); 941 mp->mnt_flag &= ~MNT_UPDATEMASK; 942 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 943 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 944 if ((mp->mnt_flag & MNT_ASYNC) == 0) 945 mp->mnt_kern_flag &= ~MNTK_ASYNC; 946 MNT_IUNLOCK(mp); 947 mp->mnt_optnew = *optlist; 948 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 949 950 /* 951 * Mount the filesystem. 952 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 953 * get. No freeing of cn_pnbuf. 954 */ 955 error = VFS_MOUNT(mp); 956 957 export_error = 0; 958 /* Process the export option. */ 959 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 960 &len) == 0) { 961 /* Assume that there is only 1 ABI for each length. */ 962 switch (len) { 963 case (sizeof(struct oexport_args)): 964 bzero(&export, sizeof(export)); 965 /* FALLTHROUGH */ 966 case (sizeof(export)): 967 bcopy(bufp, &export, len); 968 export_error = vfs_export(mp, &export); 969 break; 970 default: 971 export_error = EINVAL; 972 break; 973 } 974 } 975 976 MNT_ILOCK(mp); 977 if (error == 0) { 978 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 979 MNT_SNAPSHOT); 980 } else { 981 /* 982 * If we fail, restore old mount flags. MNT_QUOTA is special, 983 * because it is not part of MNT_UPDATEMASK, but it could have 984 * changed in the meantime if quotactl(2) was called. 985 * All in all we want current value of MNT_QUOTA, not the old 986 * one. 987 */ 988 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 989 } 990 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 991 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 992 mp->mnt_kern_flag |= MNTK_ASYNC; 993 else 994 mp->mnt_kern_flag &= ~MNTK_ASYNC; 995 MNT_IUNLOCK(mp); 996 997 if (error != 0) 998 goto end; 999 1000 if (mp->mnt_opt != NULL) 1001 vfs_freeopts(mp->mnt_opt); 1002 mp->mnt_opt = mp->mnt_optnew; 1003 *optlist = NULL; 1004 (void)VFS_STATFS(mp, &mp->mnt_stat); 1005 /* 1006 * Prevent external consumers of mount options from reading 1007 * mnt_optnew. 1008 */ 1009 mp->mnt_optnew = NULL; 1010 1011 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1012 vfs_allocate_syncvnode(mp); 1013 else 1014 vfs_deallocate_syncvnode(mp); 1015 end: 1016 vfs_unbusy(mp); 1017 VI_LOCK(vp); 1018 vp->v_iflag &= ~VI_MOUNT; 1019 VI_UNLOCK(vp); 1020 vrele(vp); 1021 return (error != 0 ? error : export_error); 1022 } 1023 1024 /* 1025 * vfs_domount(): actually attempt a filesystem mount. 1026 */ 1027 static int 1028 vfs_domount( 1029 struct thread *td, /* Calling thread. */ 1030 const char *fstype, /* Filesystem type. */ 1031 char *fspath, /* Mount path. */ 1032 uint64_t fsflags, /* Flags common to all filesystems. */ 1033 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1034 ) 1035 { 1036 struct vfsconf *vfsp; 1037 struct nameidata nd; 1038 struct vnode *vp; 1039 char *pathbuf; 1040 int error; 1041 1042 /* 1043 * Be ultra-paranoid about making sure the type and fspath 1044 * variables will fit in our mp buffers, including the 1045 * terminating NUL. 1046 */ 1047 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1048 return (ENAMETOOLONG); 1049 1050 if (jailed(td->td_ucred) || usermount == 0) { 1051 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1052 return (error); 1053 } 1054 1055 /* 1056 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1057 */ 1058 if (fsflags & MNT_EXPORTED) { 1059 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1060 if (error) 1061 return (error); 1062 } 1063 if (fsflags & MNT_SUIDDIR) { 1064 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1065 if (error) 1066 return (error); 1067 } 1068 /* 1069 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1070 */ 1071 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1072 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1073 fsflags |= MNT_NOSUID | MNT_USER; 1074 } 1075 1076 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1077 vfsp = NULL; 1078 if ((fsflags & MNT_UPDATE) == 0) { 1079 /* Don't try to load KLDs if we're mounting the root. */ 1080 if (fsflags & MNT_ROOTFS) 1081 vfsp = vfs_byname(fstype); 1082 else 1083 vfsp = vfs_byname_kld(fstype, td, &error); 1084 if (vfsp == NULL) 1085 return (ENODEV); 1086 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1087 return (EPERM); 1088 } 1089 1090 /* 1091 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1092 */ 1093 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1094 UIO_SYSSPACE, fspath, td); 1095 error = namei(&nd); 1096 if (error != 0) 1097 return (error); 1098 NDFREE(&nd, NDF_ONLY_PNBUF); 1099 vp = nd.ni_vp; 1100 if ((fsflags & MNT_UPDATE) == 0) { 1101 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1102 strcpy(pathbuf, fspath); 1103 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1104 /* debug.disablefullpath == 1 results in ENODEV */ 1105 if (error == 0 || error == ENODEV) { 1106 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1107 fsflags, optlist); 1108 } 1109 free(pathbuf, M_TEMP); 1110 } else 1111 error = vfs_domount_update(td, vp, fsflags, optlist); 1112 1113 return (error); 1114 } 1115 1116 /* 1117 * Unmount a filesystem. 1118 * 1119 * Note: unmount takes a path to the vnode mounted on as argument, not 1120 * special file (as before). 1121 */ 1122 #ifndef _SYS_SYSPROTO_H_ 1123 struct unmount_args { 1124 char *path; 1125 int flags; 1126 }; 1127 #endif 1128 /* ARGSUSED */ 1129 int 1130 sys_unmount(struct thread *td, struct unmount_args *uap) 1131 { 1132 struct nameidata nd; 1133 struct mount *mp; 1134 char *pathbuf; 1135 int error, id0, id1; 1136 1137 AUDIT_ARG_VALUE(uap->flags); 1138 if (jailed(td->td_ucred) || usermount == 0) { 1139 error = priv_check(td, PRIV_VFS_UNMOUNT); 1140 if (error) 1141 return (error); 1142 } 1143 1144 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1145 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1146 if (error) { 1147 free(pathbuf, M_TEMP); 1148 return (error); 1149 } 1150 if (uap->flags & MNT_BYFSID) { 1151 AUDIT_ARG_TEXT(pathbuf); 1152 /* Decode the filesystem ID. */ 1153 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1154 free(pathbuf, M_TEMP); 1155 return (EINVAL); 1156 } 1157 1158 mtx_lock(&mountlist_mtx); 1159 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1160 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1161 mp->mnt_stat.f_fsid.val[1] == id1) { 1162 vfs_ref(mp); 1163 break; 1164 } 1165 } 1166 mtx_unlock(&mountlist_mtx); 1167 } else { 1168 /* 1169 * Try to find global path for path argument. 1170 */ 1171 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1172 UIO_SYSSPACE, pathbuf, td); 1173 if (namei(&nd) == 0) { 1174 NDFREE(&nd, NDF_ONLY_PNBUF); 1175 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1176 MNAMELEN); 1177 if (error == 0 || error == ENODEV) 1178 vput(nd.ni_vp); 1179 } 1180 mtx_lock(&mountlist_mtx); 1181 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1182 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1183 vfs_ref(mp); 1184 break; 1185 } 1186 } 1187 mtx_unlock(&mountlist_mtx); 1188 } 1189 free(pathbuf, M_TEMP); 1190 if (mp == NULL) { 1191 /* 1192 * Previously we returned ENOENT for a nonexistent path and 1193 * EINVAL for a non-mountpoint. We cannot tell these apart 1194 * now, so in the !MNT_BYFSID case return the more likely 1195 * EINVAL for compatibility. 1196 */ 1197 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1198 } 1199 1200 /* 1201 * Don't allow unmounting the root filesystem. 1202 */ 1203 if (mp->mnt_flag & MNT_ROOTFS) { 1204 vfs_rel(mp); 1205 return (EINVAL); 1206 } 1207 error = dounmount(mp, uap->flags, td); 1208 return (error); 1209 } 1210 1211 /* 1212 * Return error if any of the vnodes, ignoring the root vnode 1213 * and the syncer vnode, have non-zero usecount. 1214 * 1215 * This function is purely advisory - it can return false positives 1216 * and negatives. 1217 */ 1218 static int 1219 vfs_check_usecounts(struct mount *mp) 1220 { 1221 struct vnode *vp, *mvp; 1222 1223 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1224 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1225 vp->v_usecount != 0) { 1226 VI_UNLOCK(vp); 1227 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1228 return (EBUSY); 1229 } 1230 VI_UNLOCK(vp); 1231 } 1232 1233 return (0); 1234 } 1235 1236 /* 1237 * Do the actual filesystem unmount. 1238 */ 1239 int 1240 dounmount(struct mount *mp, int flags, struct thread *td) 1241 { 1242 struct vnode *coveredvp, *fsrootvp; 1243 int error; 1244 uint64_t async_flag; 1245 int mnt_gen_r; 1246 1247 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1248 mnt_gen_r = mp->mnt_gen; 1249 VI_LOCK(coveredvp); 1250 vholdl(coveredvp); 1251 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1252 /* 1253 * Check for mp being unmounted while waiting for the 1254 * covered vnode lock. 1255 */ 1256 if (coveredvp->v_mountedhere != mp || 1257 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1258 VOP_UNLOCK(coveredvp, 0); 1259 vdrop(coveredvp); 1260 vfs_rel(mp); 1261 return (EBUSY); 1262 } 1263 } 1264 1265 /* 1266 * Only privileged root, or (if MNT_USER is set) the user that did the 1267 * original mount is permitted to unmount this filesystem. 1268 */ 1269 error = vfs_suser(mp, td); 1270 if (error != 0) { 1271 if (coveredvp != NULL) { 1272 VOP_UNLOCK(coveredvp, 0); 1273 vdrop(coveredvp); 1274 } 1275 vfs_rel(mp); 1276 return (error); 1277 } 1278 1279 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1280 MNT_ILOCK(mp); 1281 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1282 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1283 MNT_IUNLOCK(mp); 1284 if (coveredvp != NULL) { 1285 VOP_UNLOCK(coveredvp, 0); 1286 vdrop(coveredvp); 1287 } 1288 vn_finished_write(mp); 1289 return (EBUSY); 1290 } 1291 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1292 if (flags & MNT_NONBUSY) { 1293 MNT_IUNLOCK(mp); 1294 error = vfs_check_usecounts(mp); 1295 MNT_ILOCK(mp); 1296 if (error != 0) { 1297 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ); 1298 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1299 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1300 wakeup(mp); 1301 } 1302 MNT_IUNLOCK(mp); 1303 if (coveredvp != NULL) { 1304 VOP_UNLOCK(coveredvp, 0); 1305 vdrop(coveredvp); 1306 } 1307 vn_finished_write(mp); 1308 return (error); 1309 } 1310 } 1311 /* Allow filesystems to detect that a forced unmount is in progress. */ 1312 if (flags & MNT_FORCE) { 1313 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1314 MNT_IUNLOCK(mp); 1315 /* 1316 * Must be done after setting MNTK_UNMOUNTF and before 1317 * waiting for mnt_lockref to become 0. 1318 */ 1319 VFS_PURGE(mp); 1320 MNT_ILOCK(mp); 1321 } 1322 error = 0; 1323 if (mp->mnt_lockref) { 1324 mp->mnt_kern_flag |= MNTK_DRAINING; 1325 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1326 "mount drain", 0); 1327 } 1328 MNT_IUNLOCK(mp); 1329 KASSERT(mp->mnt_lockref == 0, 1330 ("%s: invalid lock refcount in the drain path @ %s:%d", 1331 __func__, __FILE__, __LINE__)); 1332 KASSERT(error == 0, 1333 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1334 __func__, __FILE__, __LINE__)); 1335 1336 if (mp->mnt_flag & MNT_EXPUBLIC) 1337 vfs_setpublicfs(NULL, NULL, NULL); 1338 1339 /* 1340 * From now, we can claim that the use reference on the 1341 * coveredvp is ours, and the ref can be released only by 1342 * successfull unmount by us, or left for later unmount 1343 * attempt. The previously acquired hold reference is no 1344 * longer needed to protect the vnode from reuse. 1345 */ 1346 if (coveredvp != NULL) 1347 vdrop(coveredvp); 1348 1349 vfs_msync(mp, MNT_WAIT); 1350 MNT_ILOCK(mp); 1351 async_flag = mp->mnt_flag & MNT_ASYNC; 1352 mp->mnt_flag &= ~MNT_ASYNC; 1353 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1354 MNT_IUNLOCK(mp); 1355 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1356 vfs_deallocate_syncvnode(mp); 1357 /* 1358 * For forced unmounts, move process cdir/rdir refs on the fs root 1359 * vnode to the covered vnode. For non-forced unmounts we want 1360 * such references to cause an EBUSY error. 1361 */ 1362 if ((flags & MNT_FORCE) && 1363 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1364 if (mp->mnt_vnodecovered != NULL && 1365 (mp->mnt_flag & MNT_IGNORE) == 0) 1366 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1367 if (fsrootvp == rootvnode) { 1368 vrele(rootvnode); 1369 rootvnode = NULL; 1370 } 1371 vput(fsrootvp); 1372 } 1373 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1374 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1375 error = VFS_UNMOUNT(mp, flags); 1376 vn_finished_write(mp); 1377 /* 1378 * If we failed to flush the dirty blocks for this mount point, 1379 * undo all the cdir/rdir and rootvnode changes we made above. 1380 * Unless we failed to do so because the device is reporting that 1381 * it doesn't exist anymore. 1382 */ 1383 if (error && error != ENXIO) { 1384 if ((flags & MNT_FORCE) && 1385 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1386 if (mp->mnt_vnodecovered != NULL && 1387 (mp->mnt_flag & MNT_IGNORE) == 0) 1388 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1389 if (rootvnode == NULL) { 1390 rootvnode = fsrootvp; 1391 vref(rootvnode); 1392 } 1393 vput(fsrootvp); 1394 } 1395 MNT_ILOCK(mp); 1396 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1397 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1398 MNT_IUNLOCK(mp); 1399 vfs_allocate_syncvnode(mp); 1400 MNT_ILOCK(mp); 1401 } 1402 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1403 mp->mnt_flag |= async_flag; 1404 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1405 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1406 mp->mnt_kern_flag |= MNTK_ASYNC; 1407 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1408 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1409 wakeup(mp); 1410 } 1411 MNT_IUNLOCK(mp); 1412 if (coveredvp) 1413 VOP_UNLOCK(coveredvp, 0); 1414 return (error); 1415 } 1416 mtx_lock(&mountlist_mtx); 1417 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1418 mtx_unlock(&mountlist_mtx); 1419 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td); 1420 if (coveredvp != NULL) { 1421 coveredvp->v_mountedhere = NULL; 1422 vput(coveredvp); 1423 } 1424 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1425 if (mp == rootdevmp) 1426 rootdevmp = NULL; 1427 vfs_mount_destroy(mp); 1428 return (0); 1429 } 1430 1431 /* 1432 * Report errors during filesystem mounting. 1433 */ 1434 void 1435 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1436 { 1437 struct vfsoptlist *moptlist = mp->mnt_optnew; 1438 va_list ap; 1439 int error, len; 1440 char *errmsg; 1441 1442 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1443 if (error || errmsg == NULL || len <= 0) 1444 return; 1445 1446 va_start(ap, fmt); 1447 vsnprintf(errmsg, (size_t)len, fmt, ap); 1448 va_end(ap); 1449 } 1450 1451 void 1452 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1453 { 1454 va_list ap; 1455 int error, len; 1456 char *errmsg; 1457 1458 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1459 if (error || errmsg == NULL || len <= 0) 1460 return; 1461 1462 va_start(ap, fmt); 1463 vsnprintf(errmsg, (size_t)len, fmt, ap); 1464 va_end(ap); 1465 } 1466 1467 /* 1468 * --------------------------------------------------------------------- 1469 * Functions for querying mount options/arguments from filesystems. 1470 */ 1471 1472 /* 1473 * Check that no unknown options are given 1474 */ 1475 int 1476 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1477 { 1478 struct vfsopt *opt; 1479 char errmsg[255]; 1480 const char **t, *p, *q; 1481 int ret = 0; 1482 1483 TAILQ_FOREACH(opt, opts, link) { 1484 p = opt->name; 1485 q = NULL; 1486 if (p[0] == 'n' && p[1] == 'o') 1487 q = p + 2; 1488 for(t = global_opts; *t != NULL; t++) { 1489 if (strcmp(*t, p) == 0) 1490 break; 1491 if (q != NULL) { 1492 if (strcmp(*t, q) == 0) 1493 break; 1494 } 1495 } 1496 if (*t != NULL) 1497 continue; 1498 for(t = legal; *t != NULL; t++) { 1499 if (strcmp(*t, p) == 0) 1500 break; 1501 if (q != NULL) { 1502 if (strcmp(*t, q) == 0) 1503 break; 1504 } 1505 } 1506 if (*t != NULL) 1507 continue; 1508 snprintf(errmsg, sizeof(errmsg), 1509 "mount option <%s> is unknown", p); 1510 ret = EINVAL; 1511 } 1512 if (ret != 0) { 1513 TAILQ_FOREACH(opt, opts, link) { 1514 if (strcmp(opt->name, "errmsg") == 0) { 1515 strncpy((char *)opt->value, errmsg, opt->len); 1516 break; 1517 } 1518 } 1519 if (opt == NULL) 1520 printf("%s\n", errmsg); 1521 } 1522 return (ret); 1523 } 1524 1525 /* 1526 * Get a mount option by its name. 1527 * 1528 * Return 0 if the option was found, ENOENT otherwise. 1529 * If len is non-NULL it will be filled with the length 1530 * of the option. If buf is non-NULL, it will be filled 1531 * with the address of the option. 1532 */ 1533 int 1534 vfs_getopt(opts, name, buf, len) 1535 struct vfsoptlist *opts; 1536 const char *name; 1537 void **buf; 1538 int *len; 1539 { 1540 struct vfsopt *opt; 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 opt->seen = 1; 1547 if (len != NULL) 1548 *len = opt->len; 1549 if (buf != NULL) 1550 *buf = opt->value; 1551 return (0); 1552 } 1553 } 1554 return (ENOENT); 1555 } 1556 1557 int 1558 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1559 { 1560 struct vfsopt *opt; 1561 1562 if (opts == NULL) 1563 return (-1); 1564 1565 TAILQ_FOREACH(opt, opts, link) { 1566 if (strcmp(name, opt->name) == 0) { 1567 opt->seen = 1; 1568 return (opt->pos); 1569 } 1570 } 1571 return (-1); 1572 } 1573 1574 int 1575 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1576 { 1577 char *opt_value, *vtp; 1578 quad_t iv; 1579 int error, opt_len; 1580 1581 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1582 if (error != 0) 1583 return (error); 1584 if (opt_len == 0 || opt_value == NULL) 1585 return (EINVAL); 1586 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1587 return (EINVAL); 1588 iv = strtoq(opt_value, &vtp, 0); 1589 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1590 return (EINVAL); 1591 if (iv < 0) 1592 return (EINVAL); 1593 switch (vtp[0]) { 1594 case 't': 1595 case 'T': 1596 iv *= 1024; 1597 case 'g': 1598 case 'G': 1599 iv *= 1024; 1600 case 'm': 1601 case 'M': 1602 iv *= 1024; 1603 case 'k': 1604 case 'K': 1605 iv *= 1024; 1606 case '\0': 1607 break; 1608 default: 1609 return (EINVAL); 1610 } 1611 *value = iv; 1612 1613 return (0); 1614 } 1615 1616 char * 1617 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1618 { 1619 struct vfsopt *opt; 1620 1621 *error = 0; 1622 TAILQ_FOREACH(opt, opts, link) { 1623 if (strcmp(name, opt->name) != 0) 1624 continue; 1625 opt->seen = 1; 1626 if (opt->len == 0 || 1627 ((char *)opt->value)[opt->len - 1] != '\0') { 1628 *error = EINVAL; 1629 return (NULL); 1630 } 1631 return (opt->value); 1632 } 1633 *error = ENOENT; 1634 return (NULL); 1635 } 1636 1637 int 1638 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1639 uint64_t val) 1640 { 1641 struct vfsopt *opt; 1642 1643 TAILQ_FOREACH(opt, opts, link) { 1644 if (strcmp(name, opt->name) == 0) { 1645 opt->seen = 1; 1646 if (w != NULL) 1647 *w |= val; 1648 return (1); 1649 } 1650 } 1651 if (w != NULL) 1652 *w &= ~val; 1653 return (0); 1654 } 1655 1656 int 1657 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1658 { 1659 va_list ap; 1660 struct vfsopt *opt; 1661 int ret; 1662 1663 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1664 1665 TAILQ_FOREACH(opt, opts, link) { 1666 if (strcmp(name, opt->name) != 0) 1667 continue; 1668 opt->seen = 1; 1669 if (opt->len == 0 || opt->value == NULL) 1670 return (0); 1671 if (((char *)opt->value)[opt->len - 1] != '\0') 1672 return (0); 1673 va_start(ap, fmt); 1674 ret = vsscanf(opt->value, fmt, ap); 1675 va_end(ap); 1676 return (ret); 1677 } 1678 return (0); 1679 } 1680 1681 int 1682 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1683 { 1684 struct vfsopt *opt; 1685 1686 TAILQ_FOREACH(opt, opts, link) { 1687 if (strcmp(name, opt->name) != 0) 1688 continue; 1689 opt->seen = 1; 1690 if (opt->value == NULL) 1691 opt->len = len; 1692 else { 1693 if (opt->len != len) 1694 return (EINVAL); 1695 bcopy(value, opt->value, len); 1696 } 1697 return (0); 1698 } 1699 return (ENOENT); 1700 } 1701 1702 int 1703 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1704 { 1705 struct vfsopt *opt; 1706 1707 TAILQ_FOREACH(opt, opts, link) { 1708 if (strcmp(name, opt->name) != 0) 1709 continue; 1710 opt->seen = 1; 1711 if (opt->value == NULL) 1712 opt->len = len; 1713 else { 1714 if (opt->len < len) 1715 return (EINVAL); 1716 opt->len = len; 1717 bcopy(value, opt->value, len); 1718 } 1719 return (0); 1720 } 1721 return (ENOENT); 1722 } 1723 1724 int 1725 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1726 { 1727 struct vfsopt *opt; 1728 1729 TAILQ_FOREACH(opt, opts, link) { 1730 if (strcmp(name, opt->name) != 0) 1731 continue; 1732 opt->seen = 1; 1733 if (opt->value == NULL) 1734 opt->len = strlen(value) + 1; 1735 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1736 return (EINVAL); 1737 return (0); 1738 } 1739 return (ENOENT); 1740 } 1741 1742 /* 1743 * Find and copy a mount option. 1744 * 1745 * The size of the buffer has to be specified 1746 * in len, if it is not the same length as the 1747 * mount option, EINVAL is returned. 1748 * Returns ENOENT if the option is not found. 1749 */ 1750 int 1751 vfs_copyopt(opts, name, dest, len) 1752 struct vfsoptlist *opts; 1753 const char *name; 1754 void *dest; 1755 int len; 1756 { 1757 struct vfsopt *opt; 1758 1759 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1760 1761 TAILQ_FOREACH(opt, opts, link) { 1762 if (strcmp(name, opt->name) == 0) { 1763 opt->seen = 1; 1764 if (len != opt->len) 1765 return (EINVAL); 1766 bcopy(opt->value, dest, opt->len); 1767 return (0); 1768 } 1769 } 1770 return (ENOENT); 1771 } 1772 1773 int 1774 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1775 { 1776 int error; 1777 1778 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1779 if (sbp != &mp->mnt_stat) 1780 *sbp = mp->mnt_stat; 1781 return (error); 1782 } 1783 1784 void 1785 vfs_mountedfrom(struct mount *mp, const char *from) 1786 { 1787 1788 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1789 strlcpy(mp->mnt_stat.f_mntfromname, from, 1790 sizeof mp->mnt_stat.f_mntfromname); 1791 } 1792 1793 /* 1794 * --------------------------------------------------------------------- 1795 * This is the api for building mount args and mounting filesystems from 1796 * inside the kernel. 1797 * 1798 * The API works by accumulation of individual args. First error is 1799 * latched. 1800 * 1801 * XXX: should be documented in new manpage kernel_mount(9) 1802 */ 1803 1804 /* A memory allocation which must be freed when we are done */ 1805 struct mntaarg { 1806 SLIST_ENTRY(mntaarg) next; 1807 }; 1808 1809 /* The header for the mount arguments */ 1810 struct mntarg { 1811 struct iovec *v; 1812 int len; 1813 int error; 1814 SLIST_HEAD(, mntaarg) list; 1815 }; 1816 1817 /* 1818 * Add a boolean argument. 1819 * 1820 * flag is the boolean value. 1821 * name must start with "no". 1822 */ 1823 struct mntarg * 1824 mount_argb(struct mntarg *ma, int flag, const char *name) 1825 { 1826 1827 KASSERT(name[0] == 'n' && name[1] == 'o', 1828 ("mount_argb(...,%s): name must start with 'no'", name)); 1829 1830 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1831 } 1832 1833 /* 1834 * Add an argument printf style 1835 */ 1836 struct mntarg * 1837 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1838 { 1839 va_list ap; 1840 struct mntaarg *maa; 1841 struct sbuf *sb; 1842 int len; 1843 1844 if (ma == NULL) { 1845 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1846 SLIST_INIT(&ma->list); 1847 } 1848 if (ma->error) 1849 return (ma); 1850 1851 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1852 M_MOUNT, M_WAITOK); 1853 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1854 ma->v[ma->len].iov_len = strlen(name) + 1; 1855 ma->len++; 1856 1857 sb = sbuf_new_auto(); 1858 va_start(ap, fmt); 1859 sbuf_vprintf(sb, fmt, ap); 1860 va_end(ap); 1861 sbuf_finish(sb); 1862 len = sbuf_len(sb) + 1; 1863 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1864 SLIST_INSERT_HEAD(&ma->list, maa, next); 1865 bcopy(sbuf_data(sb), maa + 1, len); 1866 sbuf_delete(sb); 1867 1868 ma->v[ma->len].iov_base = maa + 1; 1869 ma->v[ma->len].iov_len = len; 1870 ma->len++; 1871 1872 return (ma); 1873 } 1874 1875 /* 1876 * Add an argument which is a userland string. 1877 */ 1878 struct mntarg * 1879 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1880 { 1881 struct mntaarg *maa; 1882 char *tbuf; 1883 1884 if (val == NULL) 1885 return (ma); 1886 if (ma == NULL) { 1887 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1888 SLIST_INIT(&ma->list); 1889 } 1890 if (ma->error) 1891 return (ma); 1892 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1893 SLIST_INSERT_HEAD(&ma->list, maa, next); 1894 tbuf = (void *)(maa + 1); 1895 ma->error = copyinstr(val, tbuf, len, NULL); 1896 return (mount_arg(ma, name, tbuf, -1)); 1897 } 1898 1899 /* 1900 * Plain argument. 1901 * 1902 * If length is -1, treat value as a C string. 1903 */ 1904 struct mntarg * 1905 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1906 { 1907 1908 if (ma == NULL) { 1909 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1910 SLIST_INIT(&ma->list); 1911 } 1912 if (ma->error) 1913 return (ma); 1914 1915 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1916 M_MOUNT, M_WAITOK); 1917 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1918 ma->v[ma->len].iov_len = strlen(name) + 1; 1919 ma->len++; 1920 1921 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1922 if (len < 0) 1923 ma->v[ma->len].iov_len = strlen(val) + 1; 1924 else 1925 ma->v[ma->len].iov_len = len; 1926 ma->len++; 1927 return (ma); 1928 } 1929 1930 /* 1931 * Free a mntarg structure 1932 */ 1933 static void 1934 free_mntarg(struct mntarg *ma) 1935 { 1936 struct mntaarg *maa; 1937 1938 while (!SLIST_EMPTY(&ma->list)) { 1939 maa = SLIST_FIRST(&ma->list); 1940 SLIST_REMOVE_HEAD(&ma->list, next); 1941 free(maa, M_MOUNT); 1942 } 1943 free(ma->v, M_MOUNT); 1944 free(ma, M_MOUNT); 1945 } 1946 1947 /* 1948 * Mount a filesystem 1949 */ 1950 int 1951 kernel_mount(struct mntarg *ma, uint64_t flags) 1952 { 1953 struct uio auio; 1954 int error; 1955 1956 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1957 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1958 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1959 1960 auio.uio_iov = ma->v; 1961 auio.uio_iovcnt = ma->len; 1962 auio.uio_segflg = UIO_SYSSPACE; 1963 1964 error = ma->error; 1965 if (!error) 1966 error = vfs_donmount(curthread, flags, &auio); 1967 free_mntarg(ma); 1968 return (error); 1969 } 1970 1971 /* 1972 * A printflike function to mount a filesystem. 1973 */ 1974 int 1975 kernel_vmount(int flags, ...) 1976 { 1977 struct mntarg *ma = NULL; 1978 va_list ap; 1979 const char *cp; 1980 const void *vp; 1981 int error; 1982 1983 va_start(ap, flags); 1984 for (;;) { 1985 cp = va_arg(ap, const char *); 1986 if (cp == NULL) 1987 break; 1988 vp = va_arg(ap, const void *); 1989 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1990 } 1991 va_end(ap); 1992 1993 error = kernel_mount(ma, flags); 1994 return (error); 1995 } 1996 1997 void 1998 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1999 { 2000 2001 bcopy(oexp, exp, sizeof(*oexp)); 2002 exp->ex_numsecflavors = 0; 2003 } 2004