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_tmpfreevnodelistsize != 0) 526 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize"); 527 if (mp->mnt_lockref != 0) 528 panic("vfs_mount_destroy: nonzero lock refcount"); 529 MNT_IUNLOCK(mp); 530 #ifdef MAC 531 mac_mount_destroy(mp); 532 #endif 533 if (mp->mnt_opt != NULL) 534 vfs_freeopts(mp->mnt_opt); 535 crfree(mp->mnt_cred); 536 uma_zfree(mount_zone, mp); 537 } 538 539 int 540 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 541 { 542 struct vfsoptlist *optlist; 543 struct vfsopt *opt, *tmp_opt; 544 char *fstype, *fspath, *errmsg; 545 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 546 547 errmsg = fspath = NULL; 548 errmsg_len = fspathlen = 0; 549 errmsg_pos = -1; 550 551 error = vfs_buildopts(fsoptions, &optlist); 552 if (error) 553 return (error); 554 555 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 556 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 557 558 /* 559 * We need these two options before the others, 560 * and they are mandatory for any filesystem. 561 * Ensure they are NUL terminated as well. 562 */ 563 fstypelen = 0; 564 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 565 if (error || fstype[fstypelen - 1] != '\0') { 566 error = EINVAL; 567 if (errmsg != NULL) 568 strncpy(errmsg, "Invalid fstype", errmsg_len); 569 goto bail; 570 } 571 fspathlen = 0; 572 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 573 if (error || fspath[fspathlen - 1] != '\0') { 574 error = EINVAL; 575 if (errmsg != NULL) 576 strncpy(errmsg, "Invalid fspath", errmsg_len); 577 goto bail; 578 } 579 580 /* 581 * We need to see if we have the "update" option 582 * before we call vfs_domount(), since vfs_domount() has special 583 * logic based on MNT_UPDATE. This is very important 584 * when we want to update the root filesystem. 585 */ 586 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 587 if (strcmp(opt->name, "update") == 0) { 588 fsflags |= MNT_UPDATE; 589 vfs_freeopt(optlist, opt); 590 } 591 else if (strcmp(opt->name, "async") == 0) 592 fsflags |= MNT_ASYNC; 593 else if (strcmp(opt->name, "force") == 0) { 594 fsflags |= MNT_FORCE; 595 vfs_freeopt(optlist, opt); 596 } 597 else if (strcmp(opt->name, "reload") == 0) { 598 fsflags |= MNT_RELOAD; 599 vfs_freeopt(optlist, opt); 600 } 601 else if (strcmp(opt->name, "multilabel") == 0) 602 fsflags |= MNT_MULTILABEL; 603 else if (strcmp(opt->name, "noasync") == 0) 604 fsflags &= ~MNT_ASYNC; 605 else if (strcmp(opt->name, "noatime") == 0) 606 fsflags |= MNT_NOATIME; 607 else if (strcmp(opt->name, "atime") == 0) { 608 free(opt->name, M_MOUNT); 609 opt->name = strdup("nonoatime", M_MOUNT); 610 } 611 else if (strcmp(opt->name, "noclusterr") == 0) 612 fsflags |= MNT_NOCLUSTERR; 613 else if (strcmp(opt->name, "clusterr") == 0) { 614 free(opt->name, M_MOUNT); 615 opt->name = strdup("nonoclusterr", M_MOUNT); 616 } 617 else if (strcmp(opt->name, "noclusterw") == 0) 618 fsflags |= MNT_NOCLUSTERW; 619 else if (strcmp(opt->name, "clusterw") == 0) { 620 free(opt->name, M_MOUNT); 621 opt->name = strdup("nonoclusterw", M_MOUNT); 622 } 623 else if (strcmp(opt->name, "noexec") == 0) 624 fsflags |= MNT_NOEXEC; 625 else if (strcmp(opt->name, "exec") == 0) { 626 free(opt->name, M_MOUNT); 627 opt->name = strdup("nonoexec", M_MOUNT); 628 } 629 else if (strcmp(opt->name, "nosuid") == 0) 630 fsflags |= MNT_NOSUID; 631 else if (strcmp(opt->name, "suid") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("nonosuid", M_MOUNT); 634 } 635 else if (strcmp(opt->name, "nosymfollow") == 0) 636 fsflags |= MNT_NOSYMFOLLOW; 637 else if (strcmp(opt->name, "symfollow") == 0) { 638 free(opt->name, M_MOUNT); 639 opt->name = strdup("nonosymfollow", M_MOUNT); 640 } 641 else if (strcmp(opt->name, "noro") == 0) 642 fsflags &= ~MNT_RDONLY; 643 else if (strcmp(opt->name, "rw") == 0) 644 fsflags &= ~MNT_RDONLY; 645 else if (strcmp(opt->name, "ro") == 0) 646 fsflags |= MNT_RDONLY; 647 else if (strcmp(opt->name, "rdonly") == 0) { 648 free(opt->name, M_MOUNT); 649 opt->name = strdup("ro", M_MOUNT); 650 fsflags |= MNT_RDONLY; 651 } 652 else if (strcmp(opt->name, "suiddir") == 0) 653 fsflags |= MNT_SUIDDIR; 654 else if (strcmp(opt->name, "sync") == 0) 655 fsflags |= MNT_SYNCHRONOUS; 656 else if (strcmp(opt->name, "union") == 0) 657 fsflags |= MNT_UNION; 658 else if (strcmp(opt->name, "automounted") == 0) { 659 fsflags |= MNT_AUTOMOUNTED; 660 vfs_freeopt(optlist, opt); 661 } 662 } 663 664 /* 665 * Be ultra-paranoid about making sure the type and fspath 666 * variables will fit in our mp buffers, including the 667 * terminating NUL. 668 */ 669 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 670 error = ENAMETOOLONG; 671 goto bail; 672 } 673 674 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 675 bail: 676 /* copyout the errmsg */ 677 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 678 && errmsg_len > 0 && errmsg != NULL) { 679 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 680 bcopy(errmsg, 681 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 682 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 683 } else { 684 copyout(errmsg, 685 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 686 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 687 } 688 } 689 690 if (optlist != NULL) 691 vfs_freeopts(optlist); 692 return (error); 693 } 694 695 /* 696 * Old mount API. 697 */ 698 #ifndef _SYS_SYSPROTO_H_ 699 struct mount_args { 700 char *type; 701 char *path; 702 int flags; 703 caddr_t data; 704 }; 705 #endif 706 /* ARGSUSED */ 707 int 708 sys_mount(td, uap) 709 struct thread *td; 710 struct mount_args /* { 711 char *type; 712 char *path; 713 int flags; 714 caddr_t data; 715 } */ *uap; 716 { 717 char *fstype; 718 struct vfsconf *vfsp = NULL; 719 struct mntarg *ma = NULL; 720 uint64_t flags; 721 int error; 722 723 /* 724 * Mount flags are now 64-bits. On 32-bit architectures only 725 * 32-bits are passed in, but from here on everything handles 726 * 64-bit flags correctly. 727 */ 728 flags = uap->flags; 729 730 AUDIT_ARG_FFLAGS(flags); 731 732 /* 733 * Filter out MNT_ROOTFS. We do not want clients of mount() in 734 * userspace to set this flag, but we must filter it out if we want 735 * MNT_UPDATE on the root file system to work. 736 * MNT_ROOTFS should only be set by the kernel when mounting its 737 * root file system. 738 */ 739 flags &= ~MNT_ROOTFS; 740 741 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 742 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 743 if (error) { 744 free(fstype, M_TEMP); 745 return (error); 746 } 747 748 AUDIT_ARG_TEXT(fstype); 749 vfsp = vfs_byname_kld(fstype, td, &error); 750 free(fstype, M_TEMP); 751 if (vfsp == NULL) 752 return (ENOENT); 753 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 754 return (EOPNOTSUPP); 755 756 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 757 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 758 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 759 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 760 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 761 762 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 763 return (error); 764 } 765 766 /* 767 * vfs_domount_first(): first file system mount (not update) 768 */ 769 static int 770 vfs_domount_first( 771 struct thread *td, /* Calling thread. */ 772 struct vfsconf *vfsp, /* File system type. */ 773 char *fspath, /* Mount path. */ 774 struct vnode *vp, /* Vnode to be covered. */ 775 uint64_t fsflags, /* Flags common to all filesystems. */ 776 struct vfsoptlist **optlist /* Options local to the filesystem. */ 777 ) 778 { 779 struct vattr va; 780 struct mount *mp; 781 struct vnode *newdp; 782 int error; 783 784 ASSERT_VOP_ELOCKED(vp, __func__); 785 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 786 787 /* 788 * If the user is not root, ensure that they own the directory 789 * onto which we are attempting to mount. 790 */ 791 error = VOP_GETATTR(vp, &va, td->td_ucred); 792 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 793 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 794 if (error == 0) 795 error = vinvalbuf(vp, V_SAVE, 0, 0); 796 if (error == 0 && vp->v_type != VDIR) 797 error = ENOTDIR; 798 if (error == 0) { 799 VI_LOCK(vp); 800 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 801 vp->v_iflag |= VI_MOUNT; 802 else 803 error = EBUSY; 804 VI_UNLOCK(vp); 805 } 806 if (error != 0) { 807 vput(vp); 808 return (error); 809 } 810 VOP_UNLOCK(vp, 0); 811 812 /* Allocate and initialize the filesystem. */ 813 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 814 /* XXXMAC: pass to vfs_mount_alloc? */ 815 mp->mnt_optnew = *optlist; 816 /* Set the mount level flags. */ 817 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 818 819 /* 820 * Mount the filesystem. 821 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 822 * get. No freeing of cn_pnbuf. 823 */ 824 error = VFS_MOUNT(mp); 825 if (error != 0) { 826 vfs_unbusy(mp); 827 vfs_mount_destroy(mp); 828 VI_LOCK(vp); 829 vp->v_iflag &= ~VI_MOUNT; 830 VI_UNLOCK(vp); 831 vrele(vp); 832 return (error); 833 } 834 835 if (mp->mnt_opt != NULL) 836 vfs_freeopts(mp->mnt_opt); 837 mp->mnt_opt = mp->mnt_optnew; 838 *optlist = NULL; 839 (void)VFS_STATFS(mp, &mp->mnt_stat); 840 841 /* 842 * Prevent external consumers of mount options from reading mnt_optnew. 843 */ 844 mp->mnt_optnew = NULL; 845 846 MNT_ILOCK(mp); 847 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 848 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 849 mp->mnt_kern_flag |= MNTK_ASYNC; 850 else 851 mp->mnt_kern_flag &= ~MNTK_ASYNC; 852 MNT_IUNLOCK(mp); 853 854 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 855 cache_purge(vp); 856 VI_LOCK(vp); 857 vp->v_iflag &= ~VI_MOUNT; 858 VI_UNLOCK(vp); 859 vp->v_mountedhere = mp; 860 /* Place the new filesystem at the end of the mount list. */ 861 mtx_lock(&mountlist_mtx); 862 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 863 mtx_unlock(&mountlist_mtx); 864 vfs_event_signal(NULL, VQ_MOUNT, 0); 865 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 866 panic("mount: lost mount"); 867 VOP_UNLOCK(vp, 0); 868 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td); 869 VOP_UNLOCK(newdp, 0); 870 mountcheckdirs(vp, newdp); 871 vrele(newdp); 872 if ((mp->mnt_flag & MNT_RDONLY) == 0) 873 vfs_allocate_syncvnode(mp); 874 vfs_unbusy(mp); 875 return (0); 876 } 877 878 /* 879 * vfs_domount_update(): update of mounted file system 880 */ 881 static int 882 vfs_domount_update( 883 struct thread *td, /* Calling thread. */ 884 struct vnode *vp, /* Mount point vnode. */ 885 uint64_t fsflags, /* Flags common to all filesystems. */ 886 struct vfsoptlist **optlist /* Options local to the filesystem. */ 887 ) 888 { 889 struct export_args export; 890 void *bufp; 891 struct mount *mp; 892 int error, export_error, len; 893 uint64_t flag; 894 895 ASSERT_VOP_ELOCKED(vp, __func__); 896 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 897 mp = vp->v_mount; 898 899 if ((vp->v_vflag & VV_ROOT) == 0) { 900 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 901 == 0) 902 error = EXDEV; 903 else 904 error = EINVAL; 905 vput(vp); 906 return (error); 907 } 908 909 /* 910 * We only allow the filesystem to be reloaded if it 911 * is currently mounted read-only. 912 */ 913 flag = mp->mnt_flag; 914 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 915 vput(vp); 916 return (EOPNOTSUPP); /* Needs translation */ 917 } 918 /* 919 * Only privileged root, or (if MNT_USER is set) the user that 920 * did the original mount is permitted to update it. 921 */ 922 error = vfs_suser(mp, td); 923 if (error != 0) { 924 vput(vp); 925 return (error); 926 } 927 if (vfs_busy(mp, MBF_NOWAIT)) { 928 vput(vp); 929 return (EBUSY); 930 } 931 VI_LOCK(vp); 932 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 933 VI_UNLOCK(vp); 934 vfs_unbusy(mp); 935 vput(vp); 936 return (EBUSY); 937 } 938 vp->v_iflag |= VI_MOUNT; 939 VI_UNLOCK(vp); 940 VOP_UNLOCK(vp, 0); 941 942 MNT_ILOCK(mp); 943 mp->mnt_flag &= ~MNT_UPDATEMASK; 944 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 945 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 946 if ((mp->mnt_flag & MNT_ASYNC) == 0) 947 mp->mnt_kern_flag &= ~MNTK_ASYNC; 948 MNT_IUNLOCK(mp); 949 mp->mnt_optnew = *optlist; 950 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 951 952 /* 953 * Mount the filesystem. 954 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 955 * get. No freeing of cn_pnbuf. 956 */ 957 error = VFS_MOUNT(mp); 958 959 export_error = 0; 960 /* Process the export option. */ 961 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 962 &len) == 0) { 963 /* Assume that there is only 1 ABI for each length. */ 964 switch (len) { 965 case (sizeof(struct oexport_args)): 966 bzero(&export, sizeof(export)); 967 /* FALLTHROUGH */ 968 case (sizeof(export)): 969 bcopy(bufp, &export, len); 970 export_error = vfs_export(mp, &export); 971 break; 972 default: 973 export_error = EINVAL; 974 break; 975 } 976 } 977 978 MNT_ILOCK(mp); 979 if (error == 0) { 980 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 981 MNT_SNAPSHOT); 982 } else { 983 /* 984 * If we fail, restore old mount flags. MNT_QUOTA is special, 985 * because it is not part of MNT_UPDATEMASK, but it could have 986 * changed in the meantime if quotactl(2) was called. 987 * All in all we want current value of MNT_QUOTA, not the old 988 * one. 989 */ 990 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 991 } 992 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 993 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 994 mp->mnt_kern_flag |= MNTK_ASYNC; 995 else 996 mp->mnt_kern_flag &= ~MNTK_ASYNC; 997 MNT_IUNLOCK(mp); 998 999 if (error != 0) 1000 goto end; 1001 1002 if (mp->mnt_opt != NULL) 1003 vfs_freeopts(mp->mnt_opt); 1004 mp->mnt_opt = mp->mnt_optnew; 1005 *optlist = NULL; 1006 (void)VFS_STATFS(mp, &mp->mnt_stat); 1007 /* 1008 * Prevent external consumers of mount options from reading 1009 * mnt_optnew. 1010 */ 1011 mp->mnt_optnew = NULL; 1012 1013 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1014 vfs_allocate_syncvnode(mp); 1015 else 1016 vfs_deallocate_syncvnode(mp); 1017 end: 1018 vfs_unbusy(mp); 1019 VI_LOCK(vp); 1020 vp->v_iflag &= ~VI_MOUNT; 1021 VI_UNLOCK(vp); 1022 vrele(vp); 1023 return (error != 0 ? error : export_error); 1024 } 1025 1026 /* 1027 * vfs_domount(): actually attempt a filesystem mount. 1028 */ 1029 static int 1030 vfs_domount( 1031 struct thread *td, /* Calling thread. */ 1032 const char *fstype, /* Filesystem type. */ 1033 char *fspath, /* Mount path. */ 1034 uint64_t fsflags, /* Flags common to all filesystems. */ 1035 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1036 ) 1037 { 1038 struct vfsconf *vfsp; 1039 struct nameidata nd; 1040 struct vnode *vp; 1041 char *pathbuf; 1042 int error; 1043 1044 /* 1045 * Be ultra-paranoid about making sure the type and fspath 1046 * variables will fit in our mp buffers, including the 1047 * terminating NUL. 1048 */ 1049 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1050 return (ENAMETOOLONG); 1051 1052 if (jailed(td->td_ucred) || usermount == 0) { 1053 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1054 return (error); 1055 } 1056 1057 /* 1058 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1059 */ 1060 if (fsflags & MNT_EXPORTED) { 1061 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1062 if (error) 1063 return (error); 1064 } 1065 if (fsflags & MNT_SUIDDIR) { 1066 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1067 if (error) 1068 return (error); 1069 } 1070 /* 1071 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1072 */ 1073 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1074 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1075 fsflags |= MNT_NOSUID | MNT_USER; 1076 } 1077 1078 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1079 vfsp = NULL; 1080 if ((fsflags & MNT_UPDATE) == 0) { 1081 /* Don't try to load KLDs if we're mounting the root. */ 1082 if (fsflags & MNT_ROOTFS) 1083 vfsp = vfs_byname(fstype); 1084 else 1085 vfsp = vfs_byname_kld(fstype, td, &error); 1086 if (vfsp == NULL) 1087 return (ENODEV); 1088 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1089 return (EPERM); 1090 } 1091 1092 /* 1093 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1094 */ 1095 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1096 UIO_SYSSPACE, fspath, td); 1097 error = namei(&nd); 1098 if (error != 0) 1099 return (error); 1100 NDFREE(&nd, NDF_ONLY_PNBUF); 1101 vp = nd.ni_vp; 1102 if ((fsflags & MNT_UPDATE) == 0) { 1103 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1104 strcpy(pathbuf, fspath); 1105 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1106 /* debug.disablefullpath == 1 results in ENODEV */ 1107 if (error == 0 || error == ENODEV) { 1108 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1109 fsflags, optlist); 1110 } 1111 free(pathbuf, M_TEMP); 1112 } else 1113 error = vfs_domount_update(td, vp, fsflags, optlist); 1114 1115 return (error); 1116 } 1117 1118 /* 1119 * Unmount a filesystem. 1120 * 1121 * Note: unmount takes a path to the vnode mounted on as argument, not 1122 * special file (as before). 1123 */ 1124 #ifndef _SYS_SYSPROTO_H_ 1125 struct unmount_args { 1126 char *path; 1127 int flags; 1128 }; 1129 #endif 1130 /* ARGSUSED */ 1131 int 1132 sys_unmount(struct thread *td, struct unmount_args *uap) 1133 { 1134 struct nameidata nd; 1135 struct mount *mp; 1136 char *pathbuf; 1137 int error, id0, id1; 1138 1139 AUDIT_ARG_VALUE(uap->flags); 1140 if (jailed(td->td_ucred) || usermount == 0) { 1141 error = priv_check(td, PRIV_VFS_UNMOUNT); 1142 if (error) 1143 return (error); 1144 } 1145 1146 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1147 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1148 if (error) { 1149 free(pathbuf, M_TEMP); 1150 return (error); 1151 } 1152 if (uap->flags & MNT_BYFSID) { 1153 AUDIT_ARG_TEXT(pathbuf); 1154 /* Decode the filesystem ID. */ 1155 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1156 free(pathbuf, M_TEMP); 1157 return (EINVAL); 1158 } 1159 1160 mtx_lock(&mountlist_mtx); 1161 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1162 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1163 mp->mnt_stat.f_fsid.val[1] == id1) { 1164 vfs_ref(mp); 1165 break; 1166 } 1167 } 1168 mtx_unlock(&mountlist_mtx); 1169 } else { 1170 /* 1171 * Try to find global path for path argument. 1172 */ 1173 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1174 UIO_SYSSPACE, pathbuf, td); 1175 if (namei(&nd) == 0) { 1176 NDFREE(&nd, NDF_ONLY_PNBUF); 1177 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1178 MNAMELEN); 1179 if (error == 0 || error == ENODEV) 1180 vput(nd.ni_vp); 1181 } 1182 mtx_lock(&mountlist_mtx); 1183 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1184 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1185 vfs_ref(mp); 1186 break; 1187 } 1188 } 1189 mtx_unlock(&mountlist_mtx); 1190 } 1191 free(pathbuf, M_TEMP); 1192 if (mp == NULL) { 1193 /* 1194 * Previously we returned ENOENT for a nonexistent path and 1195 * EINVAL for a non-mountpoint. We cannot tell these apart 1196 * now, so in the !MNT_BYFSID case return the more likely 1197 * EINVAL for compatibility. 1198 */ 1199 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1200 } 1201 1202 /* 1203 * Don't allow unmounting the root filesystem. 1204 */ 1205 if (mp->mnt_flag & MNT_ROOTFS) { 1206 vfs_rel(mp); 1207 return (EINVAL); 1208 } 1209 error = dounmount(mp, uap->flags, td); 1210 return (error); 1211 } 1212 1213 /* 1214 * Return error if any of the vnodes, ignoring the root vnode 1215 * and the syncer vnode, have non-zero usecount. 1216 * 1217 * This function is purely advisory - it can return false positives 1218 * and negatives. 1219 */ 1220 static int 1221 vfs_check_usecounts(struct mount *mp) 1222 { 1223 struct vnode *vp, *mvp; 1224 1225 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1226 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1227 vp->v_usecount != 0) { 1228 VI_UNLOCK(vp); 1229 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1230 return (EBUSY); 1231 } 1232 VI_UNLOCK(vp); 1233 } 1234 1235 return (0); 1236 } 1237 1238 /* 1239 * Do the actual filesystem unmount. 1240 */ 1241 int 1242 dounmount(struct mount *mp, int flags, struct thread *td) 1243 { 1244 struct vnode *coveredvp, *fsrootvp; 1245 int error; 1246 uint64_t async_flag; 1247 int mnt_gen_r; 1248 1249 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1250 mnt_gen_r = mp->mnt_gen; 1251 VI_LOCK(coveredvp); 1252 vholdl(coveredvp); 1253 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1254 /* 1255 * Check for mp being unmounted while waiting for the 1256 * covered vnode lock. 1257 */ 1258 if (coveredvp->v_mountedhere != mp || 1259 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1260 VOP_UNLOCK(coveredvp, 0); 1261 vdrop(coveredvp); 1262 vfs_rel(mp); 1263 return (EBUSY); 1264 } 1265 } 1266 1267 /* 1268 * Only privileged root, or (if MNT_USER is set) the user that did the 1269 * original mount is permitted to unmount this filesystem. 1270 */ 1271 error = vfs_suser(mp, td); 1272 if (error != 0) { 1273 if (coveredvp != NULL) { 1274 VOP_UNLOCK(coveredvp, 0); 1275 vdrop(coveredvp); 1276 } 1277 vfs_rel(mp); 1278 return (error); 1279 } 1280 1281 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1282 MNT_ILOCK(mp); 1283 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1284 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1285 MNT_IUNLOCK(mp); 1286 if (coveredvp != NULL) { 1287 VOP_UNLOCK(coveredvp, 0); 1288 vdrop(coveredvp); 1289 } 1290 vn_finished_write(mp); 1291 return (EBUSY); 1292 } 1293 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1294 if (flags & MNT_NONBUSY) { 1295 MNT_IUNLOCK(mp); 1296 error = vfs_check_usecounts(mp); 1297 MNT_ILOCK(mp); 1298 if (error != 0) { 1299 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ); 1300 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1301 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1302 wakeup(mp); 1303 } 1304 MNT_IUNLOCK(mp); 1305 if (coveredvp != NULL) { 1306 VOP_UNLOCK(coveredvp, 0); 1307 vdrop(coveredvp); 1308 } 1309 vn_finished_write(mp); 1310 return (error); 1311 } 1312 } 1313 /* Allow filesystems to detect that a forced unmount is in progress. */ 1314 if (flags & MNT_FORCE) { 1315 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1316 MNT_IUNLOCK(mp); 1317 /* 1318 * Must be done after setting MNTK_UNMOUNTF and before 1319 * waiting for mnt_lockref to become 0. 1320 */ 1321 VFS_PURGE(mp); 1322 MNT_ILOCK(mp); 1323 } 1324 error = 0; 1325 if (mp->mnt_lockref) { 1326 mp->mnt_kern_flag |= MNTK_DRAINING; 1327 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1328 "mount drain", 0); 1329 } 1330 MNT_IUNLOCK(mp); 1331 KASSERT(mp->mnt_lockref == 0, 1332 ("%s: invalid lock refcount in the drain path @ %s:%d", 1333 __func__, __FILE__, __LINE__)); 1334 KASSERT(error == 0, 1335 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1336 __func__, __FILE__, __LINE__)); 1337 1338 if (mp->mnt_flag & MNT_EXPUBLIC) 1339 vfs_setpublicfs(NULL, NULL, NULL); 1340 1341 /* 1342 * From now, we can claim that the use reference on the 1343 * coveredvp is ours, and the ref can be released only by 1344 * successfull unmount by us, or left for later unmount 1345 * attempt. The previously acquired hold reference is no 1346 * longer needed to protect the vnode from reuse. 1347 */ 1348 if (coveredvp != NULL) 1349 vdrop(coveredvp); 1350 1351 vfs_msync(mp, MNT_WAIT); 1352 MNT_ILOCK(mp); 1353 async_flag = mp->mnt_flag & MNT_ASYNC; 1354 mp->mnt_flag &= ~MNT_ASYNC; 1355 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1356 MNT_IUNLOCK(mp); 1357 cache_purgevfs(mp, false); /* remove cache entries for this file sys */ 1358 vfs_deallocate_syncvnode(mp); 1359 /* 1360 * For forced unmounts, move process cdir/rdir refs on the fs root 1361 * vnode to the covered vnode. For non-forced unmounts we want 1362 * such references to cause an EBUSY error. 1363 */ 1364 if ((flags & MNT_FORCE) && 1365 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1366 if (mp->mnt_vnodecovered != NULL && 1367 (mp->mnt_flag & MNT_IGNORE) == 0) 1368 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1369 if (fsrootvp == rootvnode) { 1370 vrele(rootvnode); 1371 rootvnode = NULL; 1372 } 1373 vput(fsrootvp); 1374 } 1375 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1376 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1377 error = VFS_UNMOUNT(mp, flags); 1378 vn_finished_write(mp); 1379 /* 1380 * If we failed to flush the dirty blocks for this mount point, 1381 * undo all the cdir/rdir and rootvnode changes we made above. 1382 * Unless we failed to do so because the device is reporting that 1383 * it doesn't exist anymore. 1384 */ 1385 if (error && error != ENXIO) { 1386 if ((flags & MNT_FORCE) && 1387 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1388 if (mp->mnt_vnodecovered != NULL && 1389 (mp->mnt_flag & MNT_IGNORE) == 0) 1390 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1391 if (rootvnode == NULL) { 1392 rootvnode = fsrootvp; 1393 vref(rootvnode); 1394 } 1395 vput(fsrootvp); 1396 } 1397 MNT_ILOCK(mp); 1398 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1399 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1400 MNT_IUNLOCK(mp); 1401 vfs_allocate_syncvnode(mp); 1402 MNT_ILOCK(mp); 1403 } 1404 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1405 mp->mnt_flag |= async_flag; 1406 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1407 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1408 mp->mnt_kern_flag |= MNTK_ASYNC; 1409 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1410 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1411 wakeup(mp); 1412 } 1413 MNT_IUNLOCK(mp); 1414 if (coveredvp) 1415 VOP_UNLOCK(coveredvp, 0); 1416 return (error); 1417 } 1418 mtx_lock(&mountlist_mtx); 1419 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1420 mtx_unlock(&mountlist_mtx); 1421 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td); 1422 if (coveredvp != NULL) { 1423 coveredvp->v_mountedhere = NULL; 1424 vput(coveredvp); 1425 } 1426 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1427 if (mp == rootdevmp) 1428 rootdevmp = NULL; 1429 vfs_mount_destroy(mp); 1430 return (0); 1431 } 1432 1433 /* 1434 * Report errors during filesystem mounting. 1435 */ 1436 void 1437 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1438 { 1439 struct vfsoptlist *moptlist = mp->mnt_optnew; 1440 va_list ap; 1441 int error, len; 1442 char *errmsg; 1443 1444 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1445 if (error || errmsg == NULL || len <= 0) 1446 return; 1447 1448 va_start(ap, fmt); 1449 vsnprintf(errmsg, (size_t)len, fmt, ap); 1450 va_end(ap); 1451 } 1452 1453 void 1454 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1455 { 1456 va_list ap; 1457 int error, len; 1458 char *errmsg; 1459 1460 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1461 if (error || errmsg == NULL || len <= 0) 1462 return; 1463 1464 va_start(ap, fmt); 1465 vsnprintf(errmsg, (size_t)len, fmt, ap); 1466 va_end(ap); 1467 } 1468 1469 /* 1470 * --------------------------------------------------------------------- 1471 * Functions for querying mount options/arguments from filesystems. 1472 */ 1473 1474 /* 1475 * Check that no unknown options are given 1476 */ 1477 int 1478 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1479 { 1480 struct vfsopt *opt; 1481 char errmsg[255]; 1482 const char **t, *p, *q; 1483 int ret = 0; 1484 1485 TAILQ_FOREACH(opt, opts, link) { 1486 p = opt->name; 1487 q = NULL; 1488 if (p[0] == 'n' && p[1] == 'o') 1489 q = p + 2; 1490 for(t = global_opts; *t != NULL; t++) { 1491 if (strcmp(*t, p) == 0) 1492 break; 1493 if (q != NULL) { 1494 if (strcmp(*t, q) == 0) 1495 break; 1496 } 1497 } 1498 if (*t != NULL) 1499 continue; 1500 for(t = legal; *t != NULL; t++) { 1501 if (strcmp(*t, p) == 0) 1502 break; 1503 if (q != NULL) { 1504 if (strcmp(*t, q) == 0) 1505 break; 1506 } 1507 } 1508 if (*t != NULL) 1509 continue; 1510 snprintf(errmsg, sizeof(errmsg), 1511 "mount option <%s> is unknown", p); 1512 ret = EINVAL; 1513 } 1514 if (ret != 0) { 1515 TAILQ_FOREACH(opt, opts, link) { 1516 if (strcmp(opt->name, "errmsg") == 0) { 1517 strncpy((char *)opt->value, errmsg, opt->len); 1518 break; 1519 } 1520 } 1521 if (opt == NULL) 1522 printf("%s\n", errmsg); 1523 } 1524 return (ret); 1525 } 1526 1527 /* 1528 * Get a mount option by its name. 1529 * 1530 * Return 0 if the option was found, ENOENT otherwise. 1531 * If len is non-NULL it will be filled with the length 1532 * of the option. If buf is non-NULL, it will be filled 1533 * with the address of the option. 1534 */ 1535 int 1536 vfs_getopt(opts, name, buf, len) 1537 struct vfsoptlist *opts; 1538 const char *name; 1539 void **buf; 1540 int *len; 1541 { 1542 struct vfsopt *opt; 1543 1544 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1545 1546 TAILQ_FOREACH(opt, opts, link) { 1547 if (strcmp(name, opt->name) == 0) { 1548 opt->seen = 1; 1549 if (len != NULL) 1550 *len = opt->len; 1551 if (buf != NULL) 1552 *buf = opt->value; 1553 return (0); 1554 } 1555 } 1556 return (ENOENT); 1557 } 1558 1559 int 1560 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1561 { 1562 struct vfsopt *opt; 1563 1564 if (opts == NULL) 1565 return (-1); 1566 1567 TAILQ_FOREACH(opt, opts, link) { 1568 if (strcmp(name, opt->name) == 0) { 1569 opt->seen = 1; 1570 return (opt->pos); 1571 } 1572 } 1573 return (-1); 1574 } 1575 1576 int 1577 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1578 { 1579 char *opt_value, *vtp; 1580 quad_t iv; 1581 int error, opt_len; 1582 1583 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1584 if (error != 0) 1585 return (error); 1586 if (opt_len == 0 || opt_value == NULL) 1587 return (EINVAL); 1588 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1589 return (EINVAL); 1590 iv = strtoq(opt_value, &vtp, 0); 1591 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1592 return (EINVAL); 1593 if (iv < 0) 1594 return (EINVAL); 1595 switch (vtp[0]) { 1596 case 't': 1597 case 'T': 1598 iv *= 1024; 1599 case 'g': 1600 case 'G': 1601 iv *= 1024; 1602 case 'm': 1603 case 'M': 1604 iv *= 1024; 1605 case 'k': 1606 case 'K': 1607 iv *= 1024; 1608 case '\0': 1609 break; 1610 default: 1611 return (EINVAL); 1612 } 1613 *value = iv; 1614 1615 return (0); 1616 } 1617 1618 char * 1619 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1620 { 1621 struct vfsopt *opt; 1622 1623 *error = 0; 1624 TAILQ_FOREACH(opt, opts, link) { 1625 if (strcmp(name, opt->name) != 0) 1626 continue; 1627 opt->seen = 1; 1628 if (opt->len == 0 || 1629 ((char *)opt->value)[opt->len - 1] != '\0') { 1630 *error = EINVAL; 1631 return (NULL); 1632 } 1633 return (opt->value); 1634 } 1635 *error = ENOENT; 1636 return (NULL); 1637 } 1638 1639 int 1640 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1641 uint64_t val) 1642 { 1643 struct vfsopt *opt; 1644 1645 TAILQ_FOREACH(opt, opts, link) { 1646 if (strcmp(name, opt->name) == 0) { 1647 opt->seen = 1; 1648 if (w != NULL) 1649 *w |= val; 1650 return (1); 1651 } 1652 } 1653 if (w != NULL) 1654 *w &= ~val; 1655 return (0); 1656 } 1657 1658 int 1659 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1660 { 1661 va_list ap; 1662 struct vfsopt *opt; 1663 int ret; 1664 1665 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1666 1667 TAILQ_FOREACH(opt, opts, link) { 1668 if (strcmp(name, opt->name) != 0) 1669 continue; 1670 opt->seen = 1; 1671 if (opt->len == 0 || opt->value == NULL) 1672 return (0); 1673 if (((char *)opt->value)[opt->len - 1] != '\0') 1674 return (0); 1675 va_start(ap, fmt); 1676 ret = vsscanf(opt->value, fmt, ap); 1677 va_end(ap); 1678 return (ret); 1679 } 1680 return (0); 1681 } 1682 1683 int 1684 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1685 { 1686 struct vfsopt *opt; 1687 1688 TAILQ_FOREACH(opt, opts, link) { 1689 if (strcmp(name, opt->name) != 0) 1690 continue; 1691 opt->seen = 1; 1692 if (opt->value == NULL) 1693 opt->len = len; 1694 else { 1695 if (opt->len != len) 1696 return (EINVAL); 1697 bcopy(value, opt->value, len); 1698 } 1699 return (0); 1700 } 1701 return (ENOENT); 1702 } 1703 1704 int 1705 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1706 { 1707 struct vfsopt *opt; 1708 1709 TAILQ_FOREACH(opt, opts, link) { 1710 if (strcmp(name, opt->name) != 0) 1711 continue; 1712 opt->seen = 1; 1713 if (opt->value == NULL) 1714 opt->len = len; 1715 else { 1716 if (opt->len < len) 1717 return (EINVAL); 1718 opt->len = len; 1719 bcopy(value, opt->value, len); 1720 } 1721 return (0); 1722 } 1723 return (ENOENT); 1724 } 1725 1726 int 1727 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1728 { 1729 struct vfsopt *opt; 1730 1731 TAILQ_FOREACH(opt, opts, link) { 1732 if (strcmp(name, opt->name) != 0) 1733 continue; 1734 opt->seen = 1; 1735 if (opt->value == NULL) 1736 opt->len = strlen(value) + 1; 1737 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1738 return (EINVAL); 1739 return (0); 1740 } 1741 return (ENOENT); 1742 } 1743 1744 /* 1745 * Find and copy a mount option. 1746 * 1747 * The size of the buffer has to be specified 1748 * in len, if it is not the same length as the 1749 * mount option, EINVAL is returned. 1750 * Returns ENOENT if the option is not found. 1751 */ 1752 int 1753 vfs_copyopt(opts, name, dest, len) 1754 struct vfsoptlist *opts; 1755 const char *name; 1756 void *dest; 1757 int len; 1758 { 1759 struct vfsopt *opt; 1760 1761 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1762 1763 TAILQ_FOREACH(opt, opts, link) { 1764 if (strcmp(name, opt->name) == 0) { 1765 opt->seen = 1; 1766 if (len != opt->len) 1767 return (EINVAL); 1768 bcopy(opt->value, dest, opt->len); 1769 return (0); 1770 } 1771 } 1772 return (ENOENT); 1773 } 1774 1775 int 1776 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1777 { 1778 int error; 1779 1780 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1781 if (sbp != &mp->mnt_stat) 1782 *sbp = mp->mnt_stat; 1783 return (error); 1784 } 1785 1786 void 1787 vfs_mountedfrom(struct mount *mp, const char *from) 1788 { 1789 1790 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1791 strlcpy(mp->mnt_stat.f_mntfromname, from, 1792 sizeof mp->mnt_stat.f_mntfromname); 1793 } 1794 1795 /* 1796 * --------------------------------------------------------------------- 1797 * This is the api for building mount args and mounting filesystems from 1798 * inside the kernel. 1799 * 1800 * The API works by accumulation of individual args. First error is 1801 * latched. 1802 * 1803 * XXX: should be documented in new manpage kernel_mount(9) 1804 */ 1805 1806 /* A memory allocation which must be freed when we are done */ 1807 struct mntaarg { 1808 SLIST_ENTRY(mntaarg) next; 1809 }; 1810 1811 /* The header for the mount arguments */ 1812 struct mntarg { 1813 struct iovec *v; 1814 int len; 1815 int error; 1816 SLIST_HEAD(, mntaarg) list; 1817 }; 1818 1819 /* 1820 * Add a boolean argument. 1821 * 1822 * flag is the boolean value. 1823 * name must start with "no". 1824 */ 1825 struct mntarg * 1826 mount_argb(struct mntarg *ma, int flag, const char *name) 1827 { 1828 1829 KASSERT(name[0] == 'n' && name[1] == 'o', 1830 ("mount_argb(...,%s): name must start with 'no'", name)); 1831 1832 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1833 } 1834 1835 /* 1836 * Add an argument printf style 1837 */ 1838 struct mntarg * 1839 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1840 { 1841 va_list ap; 1842 struct mntaarg *maa; 1843 struct sbuf *sb; 1844 int len; 1845 1846 if (ma == NULL) { 1847 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1848 SLIST_INIT(&ma->list); 1849 } 1850 if (ma->error) 1851 return (ma); 1852 1853 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1854 M_MOUNT, M_WAITOK); 1855 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1856 ma->v[ma->len].iov_len = strlen(name) + 1; 1857 ma->len++; 1858 1859 sb = sbuf_new_auto(); 1860 va_start(ap, fmt); 1861 sbuf_vprintf(sb, fmt, ap); 1862 va_end(ap); 1863 sbuf_finish(sb); 1864 len = sbuf_len(sb) + 1; 1865 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1866 SLIST_INSERT_HEAD(&ma->list, maa, next); 1867 bcopy(sbuf_data(sb), maa + 1, len); 1868 sbuf_delete(sb); 1869 1870 ma->v[ma->len].iov_base = maa + 1; 1871 ma->v[ma->len].iov_len = len; 1872 ma->len++; 1873 1874 return (ma); 1875 } 1876 1877 /* 1878 * Add an argument which is a userland string. 1879 */ 1880 struct mntarg * 1881 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1882 { 1883 struct mntaarg *maa; 1884 char *tbuf; 1885 1886 if (val == NULL) 1887 return (ma); 1888 if (ma == NULL) { 1889 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1890 SLIST_INIT(&ma->list); 1891 } 1892 if (ma->error) 1893 return (ma); 1894 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1895 SLIST_INSERT_HEAD(&ma->list, maa, next); 1896 tbuf = (void *)(maa + 1); 1897 ma->error = copyinstr(val, tbuf, len, NULL); 1898 return (mount_arg(ma, name, tbuf, -1)); 1899 } 1900 1901 /* 1902 * Plain argument. 1903 * 1904 * If length is -1, treat value as a C string. 1905 */ 1906 struct mntarg * 1907 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1908 { 1909 1910 if (ma == NULL) { 1911 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1912 SLIST_INIT(&ma->list); 1913 } 1914 if (ma->error) 1915 return (ma); 1916 1917 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1918 M_MOUNT, M_WAITOK); 1919 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1920 ma->v[ma->len].iov_len = strlen(name) + 1; 1921 ma->len++; 1922 1923 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1924 if (len < 0) 1925 ma->v[ma->len].iov_len = strlen(val) + 1; 1926 else 1927 ma->v[ma->len].iov_len = len; 1928 ma->len++; 1929 return (ma); 1930 } 1931 1932 /* 1933 * Free a mntarg structure 1934 */ 1935 static void 1936 free_mntarg(struct mntarg *ma) 1937 { 1938 struct mntaarg *maa; 1939 1940 while (!SLIST_EMPTY(&ma->list)) { 1941 maa = SLIST_FIRST(&ma->list); 1942 SLIST_REMOVE_HEAD(&ma->list, next); 1943 free(maa, M_MOUNT); 1944 } 1945 free(ma->v, M_MOUNT); 1946 free(ma, M_MOUNT); 1947 } 1948 1949 /* 1950 * Mount a filesystem 1951 */ 1952 int 1953 kernel_mount(struct mntarg *ma, uint64_t flags) 1954 { 1955 struct uio auio; 1956 int error; 1957 1958 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1959 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1960 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1961 1962 auio.uio_iov = ma->v; 1963 auio.uio_iovcnt = ma->len; 1964 auio.uio_segflg = UIO_SYSSPACE; 1965 1966 error = ma->error; 1967 if (!error) 1968 error = vfs_donmount(curthread, flags, &auio); 1969 free_mntarg(ma); 1970 return (error); 1971 } 1972 1973 /* 1974 * A printflike function to mount a filesystem. 1975 */ 1976 int 1977 kernel_vmount(int flags, ...) 1978 { 1979 struct mntarg *ma = NULL; 1980 va_list ap; 1981 const char *cp; 1982 const void *vp; 1983 int error; 1984 1985 va_start(ap, flags); 1986 for (;;) { 1987 cp = va_arg(ap, const char *); 1988 if (cp == NULL) 1989 break; 1990 vp = va_arg(ap, const void *); 1991 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1992 } 1993 va_end(ap); 1994 1995 error = kernel_mount(ma, flags); 1996 return (error); 1997 } 1998 1999 void 2000 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2001 { 2002 2003 bcopy(oexp, exp, sizeof(*oexp)); 2004 exp->ex_numsecflavors = 0; 2005 } 2006