1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/fcntl.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/filedesc.h> 53 #include <sys/reboot.h> 54 #include <sys/syscallsubr.h> 55 #include <sys/sysproto.h> 56 #include <sys/sx.h> 57 #include <sys/sysctl.h> 58 #include <sys/sysent.h> 59 #include <sys/systm.h> 60 #include <sys/vnode.h> 61 #include <vm/uma.h> 62 63 #include <geom/geom.h> 64 65 #include <machine/stdarg.h> 66 67 #include <security/audit/audit.h> 68 #include <security/mac/mac_framework.h> 69 70 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 71 72 static int vfs_domount(struct thread *td, const char *fstype, 73 char *fspath, int fsflags, struct vfsoptlist **optlist); 74 static void free_mntarg(struct mntarg *ma); 75 76 static int usermount = 0; 77 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 78 "Unprivileged users may mount and unmount file systems"); 79 80 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 81 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 82 static uma_zone_t mount_zone; 83 84 /* List of mounted filesystems. */ 85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87 /* For any iteration/modification of mountlist */ 88 struct mtx mountlist_mtx; 89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91 /* 92 * Global opts, taken by all filesystems 93 */ 94 static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103 }; 104 105 static int 106 mount_init(void *mem, int size, int flags) 107 { 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 113 return (0); 114 } 115 116 static void 117 mount_fini(void *mem, int size) 118 { 119 struct mount *mp; 120 121 mp = (struct mount *)mem; 122 lockdestroy(&mp->mnt_explock); 123 mtx_destroy(&mp->mnt_mtx); 124 } 125 126 static void 127 vfs_mount_init(void *dummy __unused) 128 { 129 130 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 131 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 132 } 133 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 134 135 /* 136 * --------------------------------------------------------------------- 137 * Functions for building and sanitizing the mount options 138 */ 139 140 /* Remove one mount option. */ 141 static void 142 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 143 { 144 145 TAILQ_REMOVE(opts, opt, link); 146 free(opt->name, M_MOUNT); 147 if (opt->value != NULL) 148 free(opt->value, M_MOUNT); 149 free(opt, M_MOUNT); 150 } 151 152 /* Release all resources related to the mount options. */ 153 void 154 vfs_freeopts(struct vfsoptlist *opts) 155 { 156 struct vfsopt *opt; 157 158 while (!TAILQ_EMPTY(opts)) { 159 opt = TAILQ_FIRST(opts); 160 vfs_freeopt(opts, opt); 161 } 162 free(opts, M_MOUNT); 163 } 164 165 void 166 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 167 { 168 struct vfsopt *opt, *temp; 169 170 if (opts == NULL) 171 return; 172 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 173 if (strcmp(opt->name, name) == 0) 174 vfs_freeopt(opts, opt); 175 } 176 } 177 178 static int 179 vfs_isopt_ro(const char *opt) 180 { 181 182 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 183 strcmp(opt, "norw") == 0) 184 return (1); 185 return (0); 186 } 187 188 static int 189 vfs_isopt_rw(const char *opt) 190 { 191 192 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 193 return (1); 194 return (0); 195 } 196 197 /* 198 * Check if options are equal (with or without the "no" prefix). 199 */ 200 static int 201 vfs_equalopts(const char *opt1, const char *opt2) 202 { 203 char *p; 204 205 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 206 if (strcmp(opt1, opt2) == 0) 207 return (1); 208 /* "noopt" vs. "opt" */ 209 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 210 return (1); 211 /* "opt" vs. "noopt" */ 212 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 213 return (1); 214 while ((p = strchr(opt1, '.')) != NULL && 215 !strncmp(opt1, opt2, ++p - opt1)) { 216 opt2 += p - opt1; 217 opt1 = p; 218 /* "foo.noopt" vs. "foo.opt" */ 219 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 220 return (1); 221 /* "foo.opt" vs. "foo.noopt" */ 222 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 223 return (1); 224 } 225 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 226 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 227 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 228 return (1); 229 return (0); 230 } 231 232 /* 233 * If a mount option is specified several times, 234 * (with or without the "no" prefix) only keep 235 * the last occurence of it. 236 */ 237 static void 238 vfs_sanitizeopts(struct vfsoptlist *opts) 239 { 240 struct vfsopt *opt, *opt2, *tmp; 241 242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 243 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 244 while (opt2 != NULL) { 245 if (vfs_equalopts(opt->name, opt2->name)) { 246 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 247 vfs_freeopt(opts, opt2); 248 opt2 = tmp; 249 } else { 250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 251 } 252 } 253 } 254 } 255 256 /* 257 * Build a linked list of mount options from a struct uio. 258 */ 259 int 260 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 261 { 262 struct vfsoptlist *opts; 263 struct vfsopt *opt; 264 size_t memused, namelen, optlen; 265 unsigned int i, iovcnt; 266 int error; 267 268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 269 TAILQ_INIT(opts); 270 memused = 0; 271 iovcnt = auio->uio_iovcnt; 272 for (i = 0; i < iovcnt; i += 2) { 273 namelen = auio->uio_iov[i].iov_len; 274 optlen = auio->uio_iov[i + 1].iov_len; 275 memused += sizeof(struct vfsopt) + optlen + namelen; 276 /* 277 * Avoid consuming too much memory, and attempts to overflow 278 * memused. 279 */ 280 if (memused > VFS_MOUNTARG_SIZE_MAX || 281 optlen > VFS_MOUNTARG_SIZE_MAX || 282 namelen > VFS_MOUNTARG_SIZE_MAX) { 283 error = EINVAL; 284 goto bad; 285 } 286 287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 289 opt->value = NULL; 290 opt->len = 0; 291 opt->pos = i / 2; 292 opt->seen = 0; 293 294 /* 295 * Do this early, so jumps to "bad" will free the current 296 * option. 297 */ 298 TAILQ_INSERT_TAIL(opts, opt, link); 299 300 if (auio->uio_segflg == UIO_SYSSPACE) { 301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 302 } else { 303 error = copyin(auio->uio_iov[i].iov_base, opt->name, 304 namelen); 305 if (error) 306 goto bad; 307 } 308 /* Ensure names are null-terminated strings. */ 309 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 310 error = EINVAL; 311 goto bad; 312 } 313 if (optlen != 0) { 314 opt->len = optlen; 315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 316 if (auio->uio_segflg == UIO_SYSSPACE) { 317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 318 optlen); 319 } else { 320 error = copyin(auio->uio_iov[i + 1].iov_base, 321 opt->value, optlen); 322 if (error) 323 goto bad; 324 } 325 } 326 } 327 vfs_sanitizeopts(opts); 328 *options = opts; 329 return (0); 330 bad: 331 vfs_freeopts(opts); 332 return (error); 333 } 334 335 /* 336 * Merge the old mount options with the new ones passed 337 * in the MNT_UPDATE case. 338 * 339 * XXX This function will keep a "nofoo" option in the 340 * new options if there is no matching "foo" option 341 * to be cancelled in the old options. This is a bug 342 * if the option's canonical name is "foo". E.g., "noro" 343 * shouldn't end up in the mount point's active options, 344 * but it can. 345 */ 346 static void 347 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 348 { 349 struct vfsopt *opt, *opt2, *new; 350 351 TAILQ_FOREACH(opt, opts, link) { 352 /* 353 * Check that this option hasn't been redefined 354 * nor cancelled with a "no" mount option. 355 */ 356 opt2 = TAILQ_FIRST(toopts); 357 while (opt2 != NULL) { 358 if (strcmp(opt2->name, opt->name) == 0) 359 goto next; 360 if (strncmp(opt2->name, "no", 2) == 0 && 361 strcmp(opt2->name + 2, opt->name) == 0) { 362 vfs_freeopt(toopts, opt2); 363 goto next; 364 } 365 opt2 = TAILQ_NEXT(opt2, link); 366 } 367 /* We want this option, duplicate it. */ 368 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 369 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 370 strcpy(new->name, opt->name); 371 if (opt->len != 0) { 372 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 373 bcopy(opt->value, new->value, opt->len); 374 } else { 375 new->value = NULL; 376 } 377 new->len = opt->len; 378 new->seen = opt->seen; 379 TAILQ_INSERT_TAIL(toopts, new, link); 380 next: 381 continue; 382 } 383 } 384 385 /* 386 * Mount a filesystem. 387 */ 388 int 389 nmount(td, uap) 390 struct thread *td; 391 struct nmount_args /* { 392 struct iovec *iovp; 393 unsigned int iovcnt; 394 int flags; 395 } */ *uap; 396 { 397 struct uio *auio; 398 int error; 399 u_int iovcnt; 400 401 AUDIT_ARG_FFLAGS(uap->flags); 402 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 403 uap->iovp, uap->iovcnt, uap->flags); 404 405 /* 406 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 407 * userspace to set this flag, but we must filter it out if we want 408 * MNT_UPDATE on the root file system to work. 409 * MNT_ROOTFS should only be set by the kernel when mounting its 410 * root file system. 411 */ 412 uap->flags &= ~MNT_ROOTFS; 413 414 iovcnt = uap->iovcnt; 415 /* 416 * Check that we have an even number of iovec's 417 * and that we have at least two options. 418 */ 419 if ((iovcnt & 1) || (iovcnt < 4)) { 420 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 421 uap->iovcnt); 422 return (EINVAL); 423 } 424 425 error = copyinuio(uap->iovp, iovcnt, &auio); 426 if (error) { 427 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 428 __func__, error); 429 return (error); 430 } 431 error = vfs_donmount(td, uap->flags, auio); 432 433 free(auio, M_IOV); 434 return (error); 435 } 436 437 /* 438 * --------------------------------------------------------------------- 439 * Various utility functions 440 */ 441 442 void 443 vfs_ref(struct mount *mp) 444 { 445 446 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 447 MNT_ILOCK(mp); 448 MNT_REF(mp); 449 MNT_IUNLOCK(mp); 450 } 451 452 void 453 vfs_rel(struct mount *mp) 454 { 455 456 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 457 MNT_ILOCK(mp); 458 MNT_REL(mp); 459 MNT_IUNLOCK(mp); 460 } 461 462 /* 463 * Allocate and initialize the mount point struct. 464 */ 465 struct mount * 466 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 467 struct ucred *cred) 468 { 469 struct mount *mp; 470 471 mp = uma_zalloc(mount_zone, M_WAITOK); 472 bzero(&mp->mnt_startzero, 473 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 474 TAILQ_INIT(&mp->mnt_nvnodelist); 475 mp->mnt_nvnodelistsize = 0; 476 mp->mnt_ref = 0; 477 (void) vfs_busy(mp, MBF_NOWAIT); 478 mp->mnt_op = vfsp->vfc_vfsops; 479 mp->mnt_vfc = vfsp; 480 vfsp->vfc_refcount++; /* XXX Unlocked */ 481 mp->mnt_stat.f_type = vfsp->vfc_typenum; 482 mp->mnt_gen++; 483 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 484 mp->mnt_vnodecovered = vp; 485 mp->mnt_cred = crdup(cred); 486 mp->mnt_stat.f_owner = cred->cr_uid; 487 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 488 mp->mnt_iosize_max = DFLTPHYS; 489 #ifdef MAC 490 mac_mount_init(mp); 491 mac_mount_create(cred, mp); 492 #endif 493 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 494 return (mp); 495 } 496 497 /* 498 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 499 */ 500 void 501 vfs_mount_destroy(struct mount *mp) 502 { 503 504 MNT_ILOCK(mp); 505 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 506 if (mp->mnt_kern_flag & MNTK_MWAIT) { 507 mp->mnt_kern_flag &= ~MNTK_MWAIT; 508 wakeup(mp); 509 } 510 while (mp->mnt_ref) 511 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 512 KASSERT(mp->mnt_ref == 0, 513 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 514 __FILE__, __LINE__)); 515 if (mp->mnt_writeopcount != 0) 516 panic("vfs_mount_destroy: nonzero writeopcount"); 517 if (mp->mnt_secondary_writes != 0) 518 panic("vfs_mount_destroy: nonzero secondary_writes"); 519 mp->mnt_vfc->vfc_refcount--; 520 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 521 struct vnode *vp; 522 523 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 524 vprint("", vp); 525 panic("unmount: dangling vnode"); 526 } 527 if (mp->mnt_nvnodelistsize != 0) 528 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 529 if (mp->mnt_lockref != 0) 530 panic("vfs_mount_destroy: nonzero lock refcount"); 531 MNT_IUNLOCK(mp); 532 #ifdef MAC 533 mac_mount_destroy(mp); 534 #endif 535 if (mp->mnt_opt != NULL) 536 vfs_freeopts(mp->mnt_opt); 537 crfree(mp->mnt_cred); 538 uma_zfree(mount_zone, mp); 539 } 540 541 int 542 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 543 { 544 struct vfsoptlist *optlist; 545 struct vfsopt *opt, *noro_opt, *tmp_opt; 546 char *fstype, *fspath, *errmsg; 547 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 548 int has_rw, has_noro; 549 550 errmsg = fspath = NULL; 551 errmsg_len = has_noro = has_rw = fspathlen = 0; 552 errmsg_pos = -1; 553 554 error = vfs_buildopts(fsoptions, &optlist); 555 if (error) 556 return (error); 557 558 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 559 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 560 561 /* 562 * We need these two options before the others, 563 * and they are mandatory for any filesystem. 564 * Ensure they are NUL terminated as well. 565 */ 566 fstypelen = 0; 567 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 568 if (error || fstype[fstypelen - 1] != '\0') { 569 error = EINVAL; 570 if (errmsg != NULL) 571 strncpy(errmsg, "Invalid fstype", errmsg_len); 572 goto bail; 573 } 574 fspathlen = 0; 575 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 576 if (error || fspath[fspathlen - 1] != '\0') { 577 error = EINVAL; 578 if (errmsg != NULL) 579 strncpy(errmsg, "Invalid fspath", errmsg_len); 580 goto bail; 581 } 582 583 /* 584 * We need to see if we have the "update" option 585 * before we call vfs_domount(), since vfs_domount() has special 586 * logic based on MNT_UPDATE. This is very important 587 * when we want to update the root filesystem. 588 */ 589 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 590 if (strcmp(opt->name, "update") == 0) { 591 fsflags |= MNT_UPDATE; 592 vfs_freeopt(optlist, opt); 593 } 594 else if (strcmp(opt->name, "async") == 0) 595 fsflags |= MNT_ASYNC; 596 else if (strcmp(opt->name, "force") == 0) { 597 fsflags |= MNT_FORCE; 598 vfs_freeopt(optlist, opt); 599 } 600 else if (strcmp(opt->name, "reload") == 0) { 601 fsflags |= MNT_RELOAD; 602 vfs_freeopt(optlist, opt); 603 } 604 else if (strcmp(opt->name, "multilabel") == 0) 605 fsflags |= MNT_MULTILABEL; 606 else if (strcmp(opt->name, "noasync") == 0) 607 fsflags &= ~MNT_ASYNC; 608 else if (strcmp(opt->name, "noatime") == 0) 609 fsflags |= MNT_NOATIME; 610 else if (strcmp(opt->name, "atime") == 0) { 611 free(opt->name, M_MOUNT); 612 opt->name = strdup("nonoatime", M_MOUNT); 613 } 614 else if (strcmp(opt->name, "noclusterr") == 0) 615 fsflags |= MNT_NOCLUSTERR; 616 else if (strcmp(opt->name, "clusterr") == 0) { 617 free(opt->name, M_MOUNT); 618 opt->name = strdup("nonoclusterr", M_MOUNT); 619 } 620 else if (strcmp(opt->name, "noclusterw") == 0) 621 fsflags |= MNT_NOCLUSTERW; 622 else if (strcmp(opt->name, "clusterw") == 0) { 623 free(opt->name, M_MOUNT); 624 opt->name = strdup("nonoclusterw", M_MOUNT); 625 } 626 else if (strcmp(opt->name, "noexec") == 0) 627 fsflags |= MNT_NOEXEC; 628 else if (strcmp(opt->name, "exec") == 0) { 629 free(opt->name, M_MOUNT); 630 opt->name = strdup("nonoexec", M_MOUNT); 631 } 632 else if (strcmp(opt->name, "nosuid") == 0) 633 fsflags |= MNT_NOSUID; 634 else if (strcmp(opt->name, "suid") == 0) { 635 free(opt->name, M_MOUNT); 636 opt->name = strdup("nonosuid", M_MOUNT); 637 } 638 else if (strcmp(opt->name, "nosymfollow") == 0) 639 fsflags |= MNT_NOSYMFOLLOW; 640 else if (strcmp(opt->name, "symfollow") == 0) { 641 free(opt->name, M_MOUNT); 642 opt->name = strdup("nonosymfollow", M_MOUNT); 643 } 644 else if (strcmp(opt->name, "noro") == 0) { 645 fsflags &= ~MNT_RDONLY; 646 has_noro = 1; 647 } 648 else if (strcmp(opt->name, "rw") == 0) { 649 fsflags &= ~MNT_RDONLY; 650 has_rw = 1; 651 } 652 else if (strcmp(opt->name, "ro") == 0) 653 fsflags |= MNT_RDONLY; 654 else if (strcmp(opt->name, "rdonly") == 0) { 655 free(opt->name, M_MOUNT); 656 opt->name = strdup("ro", M_MOUNT); 657 fsflags |= MNT_RDONLY; 658 } 659 else if (strcmp(opt->name, "suiddir") == 0) 660 fsflags |= MNT_SUIDDIR; 661 else if (strcmp(opt->name, "sync") == 0) 662 fsflags |= MNT_SYNCHRONOUS; 663 else if (strcmp(opt->name, "union") == 0) 664 fsflags |= MNT_UNION; 665 } 666 667 /* 668 * If "rw" was specified as a mount option, and we 669 * are trying to update a mount-point from "ro" to "rw", 670 * we need a mount option "noro", since in vfs_mergeopts(), 671 * "noro" will cancel "ro", but "rw" will not do anything. 672 */ 673 if (has_rw && !has_noro) { 674 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 675 noro_opt->name = strdup("noro", M_MOUNT); 676 noro_opt->value = NULL; 677 noro_opt->len = 0; 678 noro_opt->pos = -1; 679 noro_opt->seen = 1; 680 TAILQ_INSERT_TAIL(optlist, noro_opt, link); 681 } 682 683 /* 684 * Be ultra-paranoid about making sure the type and fspath 685 * variables will fit in our mp buffers, including the 686 * terminating NUL. 687 */ 688 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 689 error = ENAMETOOLONG; 690 goto bail; 691 } 692 693 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 694 bail: 695 /* copyout the errmsg */ 696 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 697 && errmsg_len > 0 && errmsg != NULL) { 698 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 699 bcopy(errmsg, 700 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 701 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 702 } else { 703 copyout(errmsg, 704 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 705 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 706 } 707 } 708 709 if (optlist != NULL) 710 vfs_freeopts(optlist); 711 return (error); 712 } 713 714 /* 715 * Old mount API. 716 */ 717 #ifndef _SYS_SYSPROTO_H_ 718 struct mount_args { 719 char *type; 720 char *path; 721 int flags; 722 caddr_t data; 723 }; 724 #endif 725 /* ARGSUSED */ 726 int 727 mount(td, uap) 728 struct thread *td; 729 struct mount_args /* { 730 char *type; 731 char *path; 732 int flags; 733 caddr_t data; 734 } */ *uap; 735 { 736 char *fstype; 737 struct vfsconf *vfsp = NULL; 738 struct mntarg *ma = NULL; 739 int error; 740 741 AUDIT_ARG_FFLAGS(uap->flags); 742 743 /* 744 * Filter out MNT_ROOTFS. We do not want clients of mount() in 745 * userspace to set this flag, but we must filter it out if we want 746 * MNT_UPDATE on the root file system to work. 747 * MNT_ROOTFS should only be set by the kernel when mounting its 748 * root file system. 749 */ 750 uap->flags &= ~MNT_ROOTFS; 751 752 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 753 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 754 if (error) { 755 free(fstype, M_TEMP); 756 return (error); 757 } 758 759 AUDIT_ARG_TEXT(fstype); 760 mtx_lock(&Giant); 761 vfsp = vfs_byname_kld(fstype, td, &error); 762 free(fstype, M_TEMP); 763 if (vfsp == NULL) { 764 mtx_unlock(&Giant); 765 return (ENOENT); 766 } 767 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 768 mtx_unlock(&Giant); 769 return (EOPNOTSUPP); 770 } 771 772 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 773 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 774 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 775 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 776 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 777 778 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags); 779 mtx_unlock(&Giant); 780 return (error); 781 } 782 783 /* 784 * vfs_domount_first(): first file system mount (not update) 785 */ 786 static int 787 vfs_domount_first( 788 struct thread *td, /* Calling thread. */ 789 struct vfsconf *vfsp, /* File system type. */ 790 char *fspath, /* Mount path. */ 791 struct vnode *vp, /* Vnode to be covered. */ 792 int fsflags, /* Flags common to all filesystems. */ 793 struct vfsoptlist **optlist /* Options local to the filesystem. */ 794 ) 795 { 796 struct vattr va; 797 struct mount *mp; 798 struct vnode *newdp; 799 int error; 800 801 mtx_assert(&Giant, MA_OWNED); 802 ASSERT_VOP_ELOCKED(vp, __func__); 803 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 804 805 /* 806 * If the user is not root, ensure that they own the directory 807 * onto which we are attempting to mount. 808 */ 809 error = VOP_GETATTR(vp, &va, td->td_ucred); 810 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 811 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 812 if (error == 0) 813 error = vinvalbuf(vp, V_SAVE, 0, 0); 814 if (error == 0 && vp->v_type != VDIR) 815 error = ENOTDIR; 816 if (error == 0) { 817 VI_LOCK(vp); 818 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 819 vp->v_iflag |= VI_MOUNT; 820 else 821 error = EBUSY; 822 VI_UNLOCK(vp); 823 } 824 if (error != 0) { 825 vput(vp); 826 return (error); 827 } 828 VOP_UNLOCK(vp, 0); 829 830 /* Allocate and initialize the filesystem. */ 831 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 832 /* XXXMAC: pass to vfs_mount_alloc? */ 833 mp->mnt_optnew = *optlist; 834 /* Set the mount level flags. */ 835 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 836 837 /* 838 * Mount the filesystem. 839 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 840 * get. No freeing of cn_pnbuf. 841 */ 842 error = VFS_MOUNT(mp); 843 if (error != 0) { 844 vfs_unbusy(mp); 845 vfs_mount_destroy(mp); 846 VI_LOCK(vp); 847 vp->v_iflag &= ~VI_MOUNT; 848 VI_UNLOCK(vp); 849 vrele(vp); 850 return (error); 851 } 852 853 if (mp->mnt_opt != NULL) 854 vfs_freeopts(mp->mnt_opt); 855 mp->mnt_opt = mp->mnt_optnew; 856 *optlist = NULL; 857 (void)VFS_STATFS(mp, &mp->mnt_stat); 858 859 /* 860 * Prevent external consumers of mount options from reading mnt_optnew. 861 */ 862 mp->mnt_optnew = NULL; 863 864 MNT_ILOCK(mp); 865 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 866 mp->mnt_kern_flag |= MNTK_ASYNC; 867 else 868 mp->mnt_kern_flag &= ~MNTK_ASYNC; 869 MNT_IUNLOCK(mp); 870 871 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 872 cache_purge(vp); 873 VI_LOCK(vp); 874 vp->v_iflag &= ~VI_MOUNT; 875 VI_UNLOCK(vp); 876 vp->v_mountedhere = mp; 877 /* Place the new filesystem at the end of the mount list. */ 878 mtx_lock(&mountlist_mtx); 879 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 880 mtx_unlock(&mountlist_mtx); 881 vfs_event_signal(NULL, VQ_MOUNT, 0); 882 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 883 panic("mount: lost mount"); 884 VOP_UNLOCK(newdp, 0); 885 VOP_UNLOCK(vp, 0); 886 mountcheckdirs(vp, newdp); 887 vrele(newdp); 888 if ((mp->mnt_flag & MNT_RDONLY) == 0) 889 vfs_allocate_syncvnode(mp); 890 vfs_unbusy(mp); 891 return (0); 892 } 893 894 /* 895 * vfs_domount_update(): update of mounted file system 896 */ 897 static int 898 vfs_domount_update( 899 struct thread *td, /* Calling thread. */ 900 struct vnode *vp, /* Mount point vnode. */ 901 int fsflags, /* Flags common to all filesystems. */ 902 struct vfsoptlist **optlist /* Options local to the filesystem. */ 903 ) 904 { 905 struct oexport_args oexport; 906 struct export_args export; 907 struct mount *mp; 908 int error, export_error, flag; 909 910 mtx_assert(&Giant, MA_OWNED); 911 ASSERT_VOP_ELOCKED(vp, __func__); 912 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 913 914 if ((vp->v_vflag & VV_ROOT) == 0) { 915 vput(vp); 916 return (EINVAL); 917 } 918 mp = vp->v_mount; 919 /* 920 * We only allow the filesystem to be reloaded if it 921 * is currently mounted read-only. 922 */ 923 flag = mp->mnt_flag; 924 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 925 vput(vp); 926 return (EOPNOTSUPP); /* Needs translation */ 927 } 928 /* 929 * Only privileged root, or (if MNT_USER is set) the user that 930 * did the original mount is permitted to update it. 931 */ 932 error = vfs_suser(mp, td); 933 if (error != 0) { 934 vput(vp); 935 return (error); 936 } 937 if (vfs_busy(mp, MBF_NOWAIT)) { 938 vput(vp); 939 return (EBUSY); 940 } 941 VI_LOCK(vp); 942 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 943 VI_UNLOCK(vp); 944 vfs_unbusy(mp); 945 vput(vp); 946 return (EBUSY); 947 } 948 vp->v_iflag |= VI_MOUNT; 949 VI_UNLOCK(vp); 950 VOP_UNLOCK(vp, 0); 951 952 MNT_ILOCK(mp); 953 mp->mnt_flag &= ~MNT_UPDATEMASK; 954 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 955 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 956 if ((mp->mnt_flag & MNT_ASYNC) == 0) 957 mp->mnt_kern_flag &= ~MNTK_ASYNC; 958 MNT_IUNLOCK(mp); 959 mp->mnt_optnew = *optlist; 960 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 961 962 /* 963 * Mount the filesystem. 964 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 965 * get. No freeing of cn_pnbuf. 966 */ 967 error = VFS_MOUNT(mp); 968 969 export_error = 0; 970 if (error == 0) { 971 /* Process the export option. */ 972 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 973 sizeof(export)) == 0) { 974 export_error = vfs_export(mp, &export); 975 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 976 sizeof(oexport)) == 0) { 977 export.ex_flags = oexport.ex_flags; 978 export.ex_root = oexport.ex_root; 979 export.ex_anon = oexport.ex_anon; 980 export.ex_addr = oexport.ex_addr; 981 export.ex_addrlen = oexport.ex_addrlen; 982 export.ex_mask = oexport.ex_mask; 983 export.ex_masklen = oexport.ex_masklen; 984 export.ex_indexfile = oexport.ex_indexfile; 985 export.ex_numsecflavors = 0; 986 export_error = vfs_export(mp, &export); 987 } 988 } 989 990 MNT_ILOCK(mp); 991 if (error == 0) { 992 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 993 MNT_SNAPSHOT); 994 } else { 995 /* 996 * If we fail, restore old mount flags. MNT_QUOTA is special, 997 * because it is not part of MNT_UPDATEMASK, but it could have 998 * changed in the meantime if quotactl(2) was called. 999 * All in all we want current value of MNT_QUOTA, not the old 1000 * one. 1001 */ 1002 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 1003 } 1004 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1005 mp->mnt_kern_flag |= MNTK_ASYNC; 1006 else 1007 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1008 MNT_IUNLOCK(mp); 1009 1010 if (error != 0) 1011 goto end; 1012 1013 if (mp->mnt_opt != NULL) 1014 vfs_freeopts(mp->mnt_opt); 1015 mp->mnt_opt = mp->mnt_optnew; 1016 *optlist = NULL; 1017 (void)VFS_STATFS(mp, &mp->mnt_stat); 1018 /* 1019 * Prevent external consumers of mount options from reading 1020 * mnt_optnew. 1021 */ 1022 mp->mnt_optnew = NULL; 1023 1024 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1025 vfs_allocate_syncvnode(mp); 1026 else 1027 vfs_deallocate_syncvnode(mp); 1028 end: 1029 vfs_unbusy(mp); 1030 VI_LOCK(vp); 1031 vp->v_iflag &= ~VI_MOUNT; 1032 VI_UNLOCK(vp); 1033 vrele(vp); 1034 return (error != 0 ? error : export_error); 1035 } 1036 1037 /* 1038 * vfs_domount(): actually attempt a filesystem mount. 1039 */ 1040 static int 1041 vfs_domount( 1042 struct thread *td, /* Calling thread. */ 1043 const char *fstype, /* Filesystem type. */ 1044 char *fspath, /* Mount path. */ 1045 int fsflags, /* Flags common to all filesystems. */ 1046 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1047 ) 1048 { 1049 struct vfsconf *vfsp; 1050 struct nameidata nd; 1051 struct vnode *vp; 1052 int error; 1053 1054 /* 1055 * Be ultra-paranoid about making sure the type and fspath 1056 * variables will fit in our mp buffers, including the 1057 * terminating NUL. 1058 */ 1059 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1060 return (ENAMETOOLONG); 1061 1062 if (jailed(td->td_ucred) || usermount == 0) { 1063 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1064 return (error); 1065 } 1066 1067 /* 1068 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1069 */ 1070 if (fsflags & MNT_EXPORTED) { 1071 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1072 if (error) 1073 return (error); 1074 } 1075 if (fsflags & MNT_SUIDDIR) { 1076 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1077 if (error) 1078 return (error); 1079 } 1080 /* 1081 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1082 */ 1083 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1084 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1085 fsflags |= MNT_NOSUID | MNT_USER; 1086 } 1087 1088 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1089 vfsp = NULL; 1090 if ((fsflags & MNT_UPDATE) == 0) { 1091 /* Don't try to load KLDs if we're mounting the root. */ 1092 if (fsflags & MNT_ROOTFS) 1093 vfsp = vfs_byname(fstype); 1094 else 1095 vfsp = vfs_byname_kld(fstype, td, &error); 1096 if (vfsp == NULL) 1097 return (ENODEV); 1098 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1099 return (EPERM); 1100 } 1101 1102 /* 1103 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1104 */ 1105 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1106 UIO_SYSSPACE, fspath, td); 1107 error = namei(&nd); 1108 if (error != 0) 1109 return (error); 1110 if (!NDHASGIANT(&nd)) 1111 mtx_lock(&Giant); 1112 NDFREE(&nd, NDF_ONLY_PNBUF); 1113 vp = nd.ni_vp; 1114 if ((fsflags & MNT_UPDATE) == 0) { 1115 error = vfs_domount_first(td, vfsp, fspath, vp, fsflags, 1116 optlist); 1117 } else { 1118 error = vfs_domount_update(td, vp, fsflags, optlist); 1119 } 1120 mtx_unlock(&Giant); 1121 1122 ASSERT_VI_UNLOCKED(vp, __func__); 1123 ASSERT_VOP_UNLOCKED(vp, __func__); 1124 1125 return (error); 1126 } 1127 1128 /* 1129 * Unmount a filesystem. 1130 * 1131 * Note: unmount takes a path to the vnode mounted on as argument, not 1132 * special file (as before). 1133 */ 1134 #ifndef _SYS_SYSPROTO_H_ 1135 struct unmount_args { 1136 char *path; 1137 int flags; 1138 }; 1139 #endif 1140 /* ARGSUSED */ 1141 int 1142 unmount(td, uap) 1143 struct thread *td; 1144 register struct unmount_args /* { 1145 char *path; 1146 int flags; 1147 } */ *uap; 1148 { 1149 struct mount *mp; 1150 char *pathbuf; 1151 int error, id0, id1; 1152 1153 AUDIT_ARG_VALUE(uap->flags); 1154 if (jailed(td->td_ucred) || usermount == 0) { 1155 error = priv_check(td, PRIV_VFS_UNMOUNT); 1156 if (error) 1157 return (error); 1158 } 1159 1160 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1161 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1162 if (error) { 1163 free(pathbuf, M_TEMP); 1164 return (error); 1165 } 1166 mtx_lock(&Giant); 1167 if (uap->flags & MNT_BYFSID) { 1168 AUDIT_ARG_TEXT(pathbuf); 1169 /* Decode the filesystem ID. */ 1170 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1171 mtx_unlock(&Giant); 1172 free(pathbuf, M_TEMP); 1173 return (EINVAL); 1174 } 1175 1176 mtx_lock(&mountlist_mtx); 1177 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1178 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1179 mp->mnt_stat.f_fsid.val[1] == id1) 1180 break; 1181 } 1182 mtx_unlock(&mountlist_mtx); 1183 } else { 1184 AUDIT_ARG_UPATH1(td, pathbuf); 1185 mtx_lock(&mountlist_mtx); 1186 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1187 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1188 break; 1189 } 1190 mtx_unlock(&mountlist_mtx); 1191 } 1192 free(pathbuf, M_TEMP); 1193 if (mp == NULL) { 1194 /* 1195 * Previously we returned ENOENT for a nonexistent path and 1196 * EINVAL for a non-mountpoint. We cannot tell these apart 1197 * now, so in the !MNT_BYFSID case return the more likely 1198 * EINVAL for compatibility. 1199 */ 1200 mtx_unlock(&Giant); 1201 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1202 } 1203 1204 /* 1205 * Don't allow unmounting the root filesystem. 1206 */ 1207 if (mp->mnt_flag & MNT_ROOTFS) { 1208 mtx_unlock(&Giant); 1209 return (EINVAL); 1210 } 1211 error = dounmount(mp, uap->flags, td); 1212 mtx_unlock(&Giant); 1213 return (error); 1214 } 1215 1216 /* 1217 * Do the actual filesystem unmount. 1218 */ 1219 int 1220 dounmount(mp, flags, td) 1221 struct mount *mp; 1222 int flags; 1223 struct thread *td; 1224 { 1225 struct vnode *coveredvp, *fsrootvp; 1226 int error; 1227 int async_flag; 1228 int mnt_gen_r; 1229 1230 mtx_assert(&Giant, MA_OWNED); 1231 1232 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1233 mnt_gen_r = mp->mnt_gen; 1234 VI_LOCK(coveredvp); 1235 vholdl(coveredvp); 1236 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1237 vdrop(coveredvp); 1238 /* 1239 * Check for mp being unmounted while waiting for the 1240 * covered vnode lock. 1241 */ 1242 if (coveredvp->v_mountedhere != mp || 1243 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1244 VOP_UNLOCK(coveredvp, 0); 1245 return (EBUSY); 1246 } 1247 } 1248 /* 1249 * Only privileged root, or (if MNT_USER is set) the user that did the 1250 * original mount is permitted to unmount this filesystem. 1251 */ 1252 error = vfs_suser(mp, td); 1253 if (error) { 1254 if (coveredvp) 1255 VOP_UNLOCK(coveredvp, 0); 1256 return (error); 1257 } 1258 1259 MNT_ILOCK(mp); 1260 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1261 MNT_IUNLOCK(mp); 1262 if (coveredvp) 1263 VOP_UNLOCK(coveredvp, 0); 1264 return (EBUSY); 1265 } 1266 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1267 /* Allow filesystems to detect that a forced unmount is in progress. */ 1268 if (flags & MNT_FORCE) 1269 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1270 error = 0; 1271 if (mp->mnt_lockref) { 1272 if ((flags & MNT_FORCE) == 0) { 1273 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ | 1274 MNTK_UNMOUNTF); 1275 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1276 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1277 wakeup(mp); 1278 } 1279 MNT_IUNLOCK(mp); 1280 if (coveredvp) 1281 VOP_UNLOCK(coveredvp, 0); 1282 return (EBUSY); 1283 } 1284 mp->mnt_kern_flag |= MNTK_DRAINING; 1285 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1286 "mount drain", 0); 1287 } 1288 MNT_IUNLOCK(mp); 1289 KASSERT(mp->mnt_lockref == 0, 1290 ("%s: invalid lock refcount in the drain path @ %s:%d", 1291 __func__, __FILE__, __LINE__)); 1292 KASSERT(error == 0, 1293 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1294 __func__, __FILE__, __LINE__)); 1295 vn_start_write(NULL, &mp, V_WAIT); 1296 1297 if (mp->mnt_flag & MNT_EXPUBLIC) 1298 vfs_setpublicfs(NULL, NULL, NULL); 1299 1300 vfs_msync(mp, MNT_WAIT); 1301 MNT_ILOCK(mp); 1302 async_flag = mp->mnt_flag & MNT_ASYNC; 1303 mp->mnt_flag &= ~MNT_ASYNC; 1304 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1305 MNT_IUNLOCK(mp); 1306 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1307 vfs_deallocate_syncvnode(mp); 1308 /* 1309 * For forced unmounts, move process cdir/rdir refs on the fs root 1310 * vnode to the covered vnode. For non-forced unmounts we want 1311 * such references to cause an EBUSY error. 1312 */ 1313 if ((flags & MNT_FORCE) && 1314 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1315 if (mp->mnt_vnodecovered != NULL) 1316 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1317 if (fsrootvp == rootvnode) { 1318 vrele(rootvnode); 1319 rootvnode = NULL; 1320 } 1321 vput(fsrootvp); 1322 } 1323 if (((mp->mnt_flag & MNT_RDONLY) || 1324 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1325 error = VFS_UNMOUNT(mp, flags); 1326 vn_finished_write(mp); 1327 /* 1328 * If we failed to flush the dirty blocks for this mount point, 1329 * undo all the cdir/rdir and rootvnode changes we made above. 1330 * Unless we failed to do so because the device is reporting that 1331 * it doesn't exist anymore. 1332 */ 1333 if (error && error != ENXIO) { 1334 if ((flags & MNT_FORCE) && 1335 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1336 if (mp->mnt_vnodecovered != NULL) 1337 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1338 if (rootvnode == NULL) { 1339 rootvnode = fsrootvp; 1340 vref(rootvnode); 1341 } 1342 vput(fsrootvp); 1343 } 1344 MNT_ILOCK(mp); 1345 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1346 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1347 MNT_IUNLOCK(mp); 1348 vfs_allocate_syncvnode(mp); 1349 MNT_ILOCK(mp); 1350 } 1351 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1352 mp->mnt_flag |= async_flag; 1353 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1354 mp->mnt_kern_flag |= MNTK_ASYNC; 1355 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1356 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1357 wakeup(mp); 1358 } 1359 MNT_IUNLOCK(mp); 1360 if (coveredvp) 1361 VOP_UNLOCK(coveredvp, 0); 1362 return (error); 1363 } 1364 mtx_lock(&mountlist_mtx); 1365 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1366 mtx_unlock(&mountlist_mtx); 1367 if (coveredvp != NULL) { 1368 coveredvp->v_mountedhere = NULL; 1369 vput(coveredvp); 1370 } 1371 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1372 vfs_mount_destroy(mp); 1373 return (0); 1374 } 1375 1376 /* 1377 * Report errors during filesystem mounting. 1378 */ 1379 void 1380 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1381 { 1382 struct vfsoptlist *moptlist = mp->mnt_optnew; 1383 va_list ap; 1384 int error, len; 1385 char *errmsg; 1386 1387 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1388 if (error || errmsg == NULL || len <= 0) 1389 return; 1390 1391 va_start(ap, fmt); 1392 vsnprintf(errmsg, (size_t)len, fmt, ap); 1393 va_end(ap); 1394 } 1395 1396 void 1397 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1398 { 1399 va_list ap; 1400 int error, len; 1401 char *errmsg; 1402 1403 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1404 if (error || errmsg == NULL || len <= 0) 1405 return; 1406 1407 va_start(ap, fmt); 1408 vsnprintf(errmsg, (size_t)len, fmt, ap); 1409 va_end(ap); 1410 } 1411 1412 /* 1413 * --------------------------------------------------------------------- 1414 * Functions for querying mount options/arguments from filesystems. 1415 */ 1416 1417 /* 1418 * Check that no unknown options are given 1419 */ 1420 int 1421 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1422 { 1423 struct vfsopt *opt; 1424 char errmsg[255]; 1425 const char **t, *p, *q; 1426 int ret = 0; 1427 1428 TAILQ_FOREACH(opt, opts, link) { 1429 p = opt->name; 1430 q = NULL; 1431 if (p[0] == 'n' && p[1] == 'o') 1432 q = p + 2; 1433 for(t = global_opts; *t != NULL; t++) { 1434 if (strcmp(*t, p) == 0) 1435 break; 1436 if (q != NULL) { 1437 if (strcmp(*t, q) == 0) 1438 break; 1439 } 1440 } 1441 if (*t != NULL) 1442 continue; 1443 for(t = legal; *t != NULL; t++) { 1444 if (strcmp(*t, p) == 0) 1445 break; 1446 if (q != NULL) { 1447 if (strcmp(*t, q) == 0) 1448 break; 1449 } 1450 } 1451 if (*t != NULL) 1452 continue; 1453 snprintf(errmsg, sizeof(errmsg), 1454 "mount option <%s> is unknown", p); 1455 ret = EINVAL; 1456 } 1457 if (ret != 0) { 1458 TAILQ_FOREACH(opt, opts, link) { 1459 if (strcmp(opt->name, "errmsg") == 0) { 1460 strncpy((char *)opt->value, errmsg, opt->len); 1461 break; 1462 } 1463 } 1464 if (opt == NULL) 1465 printf("%s\n", errmsg); 1466 } 1467 return (ret); 1468 } 1469 1470 /* 1471 * Get a mount option by its name. 1472 * 1473 * Return 0 if the option was found, ENOENT otherwise. 1474 * If len is non-NULL it will be filled with the length 1475 * of the option. If buf is non-NULL, it will be filled 1476 * with the address of the option. 1477 */ 1478 int 1479 vfs_getopt(opts, name, buf, len) 1480 struct vfsoptlist *opts; 1481 const char *name; 1482 void **buf; 1483 int *len; 1484 { 1485 struct vfsopt *opt; 1486 1487 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1488 1489 TAILQ_FOREACH(opt, opts, link) { 1490 if (strcmp(name, opt->name) == 0) { 1491 opt->seen = 1; 1492 if (len != NULL) 1493 *len = opt->len; 1494 if (buf != NULL) 1495 *buf = opt->value; 1496 return (0); 1497 } 1498 } 1499 return (ENOENT); 1500 } 1501 1502 int 1503 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1504 { 1505 struct vfsopt *opt; 1506 1507 if (opts == NULL) 1508 return (-1); 1509 1510 TAILQ_FOREACH(opt, opts, link) { 1511 if (strcmp(name, opt->name) == 0) { 1512 opt->seen = 1; 1513 return (opt->pos); 1514 } 1515 } 1516 return (-1); 1517 } 1518 1519 char * 1520 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1521 { 1522 struct vfsopt *opt; 1523 1524 *error = 0; 1525 TAILQ_FOREACH(opt, opts, link) { 1526 if (strcmp(name, opt->name) != 0) 1527 continue; 1528 opt->seen = 1; 1529 if (opt->len == 0 || 1530 ((char *)opt->value)[opt->len - 1] != '\0') { 1531 *error = EINVAL; 1532 return (NULL); 1533 } 1534 return (opt->value); 1535 } 1536 *error = ENOENT; 1537 return (NULL); 1538 } 1539 1540 int 1541 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1542 { 1543 struct vfsopt *opt; 1544 1545 TAILQ_FOREACH(opt, opts, link) { 1546 if (strcmp(name, opt->name) == 0) { 1547 opt->seen = 1; 1548 if (w != NULL) 1549 *w |= val; 1550 return (1); 1551 } 1552 } 1553 if (w != NULL) 1554 *w &= ~val; 1555 return (0); 1556 } 1557 1558 int 1559 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1560 { 1561 va_list ap; 1562 struct vfsopt *opt; 1563 int ret; 1564 1565 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1566 1567 TAILQ_FOREACH(opt, opts, link) { 1568 if (strcmp(name, opt->name) != 0) 1569 continue; 1570 opt->seen = 1; 1571 if (opt->len == 0 || opt->value == NULL) 1572 return (0); 1573 if (((char *)opt->value)[opt->len - 1] != '\0') 1574 return (0); 1575 va_start(ap, fmt); 1576 ret = vsscanf(opt->value, fmt, ap); 1577 va_end(ap); 1578 return (ret); 1579 } 1580 return (0); 1581 } 1582 1583 int 1584 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1585 { 1586 struct vfsopt *opt; 1587 1588 TAILQ_FOREACH(opt, opts, link) { 1589 if (strcmp(name, opt->name) != 0) 1590 continue; 1591 opt->seen = 1; 1592 if (opt->value == NULL) 1593 opt->len = len; 1594 else { 1595 if (opt->len != len) 1596 return (EINVAL); 1597 bcopy(value, opt->value, len); 1598 } 1599 return (0); 1600 } 1601 return (ENOENT); 1602 } 1603 1604 int 1605 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1606 { 1607 struct vfsopt *opt; 1608 1609 TAILQ_FOREACH(opt, opts, link) { 1610 if (strcmp(name, opt->name) != 0) 1611 continue; 1612 opt->seen = 1; 1613 if (opt->value == NULL) 1614 opt->len = len; 1615 else { 1616 if (opt->len < len) 1617 return (EINVAL); 1618 opt->len = len; 1619 bcopy(value, opt->value, len); 1620 } 1621 return (0); 1622 } 1623 return (ENOENT); 1624 } 1625 1626 int 1627 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1628 { 1629 struct vfsopt *opt; 1630 1631 TAILQ_FOREACH(opt, opts, link) { 1632 if (strcmp(name, opt->name) != 0) 1633 continue; 1634 opt->seen = 1; 1635 if (opt->value == NULL) 1636 opt->len = strlen(value) + 1; 1637 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1638 return (EINVAL); 1639 return (0); 1640 } 1641 return (ENOENT); 1642 } 1643 1644 /* 1645 * Find and copy a mount option. 1646 * 1647 * The size of the buffer has to be specified 1648 * in len, if it is not the same length as the 1649 * mount option, EINVAL is returned. 1650 * Returns ENOENT if the option is not found. 1651 */ 1652 int 1653 vfs_copyopt(opts, name, dest, len) 1654 struct vfsoptlist *opts; 1655 const char *name; 1656 void *dest; 1657 int len; 1658 { 1659 struct vfsopt *opt; 1660 1661 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1662 1663 TAILQ_FOREACH(opt, opts, link) { 1664 if (strcmp(name, opt->name) == 0) { 1665 opt->seen = 1; 1666 if (len != opt->len) 1667 return (EINVAL); 1668 bcopy(opt->value, dest, opt->len); 1669 return (0); 1670 } 1671 } 1672 return (ENOENT); 1673 } 1674 1675 /* 1676 * This is a helper function for filesystems to traverse their 1677 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1678 */ 1679 1680 struct vnode * 1681 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1682 { 1683 struct vnode *vp; 1684 1685 mtx_assert(MNT_MTX(mp), MA_OWNED); 1686 1687 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1688 if (should_yield()) { 1689 MNT_IUNLOCK(mp); 1690 kern_yield(-1); 1691 MNT_ILOCK(mp); 1692 } 1693 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1694 while (vp != NULL && vp->v_type == VMARKER) 1695 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1696 1697 /* Check if we are done */ 1698 if (vp == NULL) { 1699 __mnt_vnode_markerfree(mvp, mp); 1700 return (NULL); 1701 } 1702 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1703 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1704 return (vp); 1705 } 1706 1707 struct vnode * 1708 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1709 { 1710 struct vnode *vp; 1711 1712 mtx_assert(MNT_MTX(mp), MA_OWNED); 1713 1714 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1715 while (vp != NULL && vp->v_type == VMARKER) 1716 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1717 1718 /* Check if we are done */ 1719 if (vp == NULL) { 1720 *mvp = NULL; 1721 return (NULL); 1722 } 1723 MNT_REF(mp); 1724 MNT_IUNLOCK(mp); 1725 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1726 M_VNODE_MARKER, 1727 M_WAITOK | M_ZERO); 1728 MNT_ILOCK(mp); 1729 (*mvp)->v_type = VMARKER; 1730 1731 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1732 while (vp != NULL && vp->v_type == VMARKER) 1733 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1734 1735 /* Check if we are done */ 1736 if (vp == NULL) { 1737 MNT_IUNLOCK(mp); 1738 free(*mvp, M_VNODE_MARKER); 1739 MNT_ILOCK(mp); 1740 *mvp = NULL; 1741 MNT_REL(mp); 1742 return (NULL); 1743 } 1744 (*mvp)->v_mount = mp; 1745 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1746 return (vp); 1747 } 1748 1749 1750 void 1751 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1752 { 1753 1754 if (*mvp == NULL) 1755 return; 1756 1757 mtx_assert(MNT_MTX(mp), MA_OWNED); 1758 1759 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1760 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1761 MNT_IUNLOCK(mp); 1762 free(*mvp, M_VNODE_MARKER); 1763 MNT_ILOCK(mp); 1764 *mvp = NULL; 1765 MNT_REL(mp); 1766 } 1767 1768 1769 int 1770 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1771 { 1772 int error; 1773 1774 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1775 if (sbp != &mp->mnt_stat) 1776 *sbp = mp->mnt_stat; 1777 return (error); 1778 } 1779 1780 void 1781 vfs_mountedfrom(struct mount *mp, const char *from) 1782 { 1783 1784 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1785 strlcpy(mp->mnt_stat.f_mntfromname, from, 1786 sizeof mp->mnt_stat.f_mntfromname); 1787 } 1788 1789 /* 1790 * --------------------------------------------------------------------- 1791 * This is the api for building mount args and mounting filesystems from 1792 * inside the kernel. 1793 * 1794 * The API works by accumulation of individual args. First error is 1795 * latched. 1796 * 1797 * XXX: should be documented in new manpage kernel_mount(9) 1798 */ 1799 1800 /* A memory allocation which must be freed when we are done */ 1801 struct mntaarg { 1802 SLIST_ENTRY(mntaarg) next; 1803 }; 1804 1805 /* The header for the mount arguments */ 1806 struct mntarg { 1807 struct iovec *v; 1808 int len; 1809 int error; 1810 SLIST_HEAD(, mntaarg) list; 1811 }; 1812 1813 /* 1814 * Add a boolean argument. 1815 * 1816 * flag is the boolean value. 1817 * name must start with "no". 1818 */ 1819 struct mntarg * 1820 mount_argb(struct mntarg *ma, int flag, const char *name) 1821 { 1822 1823 KASSERT(name[0] == 'n' && name[1] == 'o', 1824 ("mount_argb(...,%s): name must start with 'no'", name)); 1825 1826 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1827 } 1828 1829 /* 1830 * Add an argument printf style 1831 */ 1832 struct mntarg * 1833 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1834 { 1835 va_list ap; 1836 struct mntaarg *maa; 1837 struct sbuf *sb; 1838 int len; 1839 1840 if (ma == NULL) { 1841 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1842 SLIST_INIT(&ma->list); 1843 } 1844 if (ma->error) 1845 return (ma); 1846 1847 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1848 M_MOUNT, M_WAITOK); 1849 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1850 ma->v[ma->len].iov_len = strlen(name) + 1; 1851 ma->len++; 1852 1853 sb = sbuf_new_auto(); 1854 va_start(ap, fmt); 1855 sbuf_vprintf(sb, fmt, ap); 1856 va_end(ap); 1857 sbuf_finish(sb); 1858 len = sbuf_len(sb) + 1; 1859 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1860 SLIST_INSERT_HEAD(&ma->list, maa, next); 1861 bcopy(sbuf_data(sb), maa + 1, len); 1862 sbuf_delete(sb); 1863 1864 ma->v[ma->len].iov_base = maa + 1; 1865 ma->v[ma->len].iov_len = len; 1866 ma->len++; 1867 1868 return (ma); 1869 } 1870 1871 /* 1872 * Add an argument which is a userland string. 1873 */ 1874 struct mntarg * 1875 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1876 { 1877 struct mntaarg *maa; 1878 char *tbuf; 1879 1880 if (val == NULL) 1881 return (ma); 1882 if (ma == NULL) { 1883 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1884 SLIST_INIT(&ma->list); 1885 } 1886 if (ma->error) 1887 return (ma); 1888 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1889 SLIST_INSERT_HEAD(&ma->list, maa, next); 1890 tbuf = (void *)(maa + 1); 1891 ma->error = copyinstr(val, tbuf, len, NULL); 1892 return (mount_arg(ma, name, tbuf, -1)); 1893 } 1894 1895 /* 1896 * Plain argument. 1897 * 1898 * If length is -1, treat value as a C string. 1899 */ 1900 struct mntarg * 1901 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1902 { 1903 1904 if (ma == NULL) { 1905 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1906 SLIST_INIT(&ma->list); 1907 } 1908 if (ma->error) 1909 return (ma); 1910 1911 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1912 M_MOUNT, M_WAITOK); 1913 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1914 ma->v[ma->len].iov_len = strlen(name) + 1; 1915 ma->len++; 1916 1917 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1918 if (len < 0) 1919 ma->v[ma->len].iov_len = strlen(val) + 1; 1920 else 1921 ma->v[ma->len].iov_len = len; 1922 ma->len++; 1923 return (ma); 1924 } 1925 1926 /* 1927 * Free a mntarg structure 1928 */ 1929 static void 1930 free_mntarg(struct mntarg *ma) 1931 { 1932 struct mntaarg *maa; 1933 1934 while (!SLIST_EMPTY(&ma->list)) { 1935 maa = SLIST_FIRST(&ma->list); 1936 SLIST_REMOVE_HEAD(&ma->list, next); 1937 free(maa, M_MOUNT); 1938 } 1939 free(ma->v, M_MOUNT); 1940 free(ma, M_MOUNT); 1941 } 1942 1943 /* 1944 * Mount a filesystem 1945 */ 1946 int 1947 kernel_mount(struct mntarg *ma, int flags) 1948 { 1949 struct uio auio; 1950 int error; 1951 1952 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1953 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1954 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1955 1956 auio.uio_iov = ma->v; 1957 auio.uio_iovcnt = ma->len; 1958 auio.uio_segflg = UIO_SYSSPACE; 1959 1960 error = ma->error; 1961 if (!error) 1962 error = vfs_donmount(curthread, flags, &auio); 1963 free_mntarg(ma); 1964 return (error); 1965 } 1966 1967 /* 1968 * A printflike function to mount a filesystem. 1969 */ 1970 int 1971 kernel_vmount(int flags, ...) 1972 { 1973 struct mntarg *ma = NULL; 1974 va_list ap; 1975 const char *cp; 1976 const void *vp; 1977 int error; 1978 1979 va_start(ap, flags); 1980 for (;;) { 1981 cp = va_arg(ap, const char *); 1982 if (cp == NULL) 1983 break; 1984 vp = va_arg(ap, const void *); 1985 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1986 } 1987 va_end(ap); 1988 1989 error = kernel_mount(ma, flags); 1990 return (error); 1991 } 1992 1993 void 1994 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1995 { 1996 1997 bcopy(oexp, exp, sizeof(*oexp)); 1998 exp->ex_numsecflavors = 0; 1999 } 2000