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 "opt_vfs_allow_nonmpsafe.h" 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/fcntl.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/libkern.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mutex.h> 51 #include <sys/namei.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/filedesc.h> 55 #include <sys/reboot.h> 56 #include <sys/sbuf.h> 57 #include <sys/syscallsubr.h> 58 #include <sys/sysproto.h> 59 #include <sys/sx.h> 60 #include <sys/sysctl.h> 61 #include <sys/sysent.h> 62 #include <sys/systm.h> 63 #include <sys/vnode.h> 64 #include <vm/uma.h> 65 66 #include <geom/geom.h> 67 68 #include <machine/stdarg.h> 69 70 #include <security/audit/audit.h> 71 #include <security/mac/mac_framework.h> 72 73 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 74 75 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 76 uint64_t fsflags, struct vfsoptlist **optlist); 77 static void free_mntarg(struct mntarg *ma); 78 79 static int usermount = 0; 80 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 81 "Unprivileged users may mount and unmount file systems"); 82 83 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 84 static MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 85 static uma_zone_t mount_zone; 86 87 /* List of mounted filesystems. */ 88 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 89 90 /* For any iteration/modification of mountlist */ 91 struct mtx mountlist_mtx; 92 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 93 94 /* 95 * Global opts, taken by all filesystems 96 */ 97 static const char *global_opts[] = { 98 "errmsg", 99 "fstype", 100 "fspath", 101 "ro", 102 "rw", 103 "nosuid", 104 "noexec", 105 NULL 106 }; 107 108 static int 109 mount_init(void *mem, int size, int flags) 110 { 111 struct mount *mp; 112 113 mp = (struct mount *)mem; 114 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 115 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 116 return (0); 117 } 118 119 static void 120 mount_fini(void *mem, int size) 121 { 122 struct mount *mp; 123 124 mp = (struct mount *)mem; 125 lockdestroy(&mp->mnt_explock); 126 mtx_destroy(&mp->mnt_mtx); 127 } 128 129 static void 130 vfs_mount_init(void *dummy __unused) 131 { 132 133 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 134 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 135 } 136 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 137 138 /* 139 * --------------------------------------------------------------------- 140 * Functions for building and sanitizing the mount options 141 */ 142 143 /* Remove one mount option. */ 144 static void 145 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 146 { 147 148 TAILQ_REMOVE(opts, opt, link); 149 free(opt->name, M_MOUNT); 150 if (opt->value != NULL) 151 free(opt->value, M_MOUNT); 152 free(opt, M_MOUNT); 153 } 154 155 /* Release all resources related to the mount options. */ 156 void 157 vfs_freeopts(struct vfsoptlist *opts) 158 { 159 struct vfsopt *opt; 160 161 while (!TAILQ_EMPTY(opts)) { 162 opt = TAILQ_FIRST(opts); 163 vfs_freeopt(opts, opt); 164 } 165 free(opts, M_MOUNT); 166 } 167 168 void 169 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 170 { 171 struct vfsopt *opt, *temp; 172 173 if (opts == NULL) 174 return; 175 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 176 if (strcmp(opt->name, name) == 0) 177 vfs_freeopt(opts, opt); 178 } 179 } 180 181 static int 182 vfs_isopt_ro(const char *opt) 183 { 184 185 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 186 strcmp(opt, "norw") == 0) 187 return (1); 188 return (0); 189 } 190 191 static int 192 vfs_isopt_rw(const char *opt) 193 { 194 195 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 196 return (1); 197 return (0); 198 } 199 200 /* 201 * Check if options are equal (with or without the "no" prefix). 202 */ 203 static int 204 vfs_equalopts(const char *opt1, const char *opt2) 205 { 206 char *p; 207 208 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 209 if (strcmp(opt1, opt2) == 0) 210 return (1); 211 /* "noopt" vs. "opt" */ 212 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 213 return (1); 214 /* "opt" vs. "noopt" */ 215 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 216 return (1); 217 while ((p = strchr(opt1, '.')) != NULL && 218 !strncmp(opt1, opt2, ++p - opt1)) { 219 opt2 += p - opt1; 220 opt1 = p; 221 /* "foo.noopt" vs. "foo.opt" */ 222 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 223 return (1); 224 /* "foo.opt" vs. "foo.noopt" */ 225 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 226 return (1); 227 } 228 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 229 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 230 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 231 return (1); 232 return (0); 233 } 234 235 /* 236 * If a mount option is specified several times, 237 * (with or without the "no" prefix) only keep 238 * the last occurence of it. 239 */ 240 static void 241 vfs_sanitizeopts(struct vfsoptlist *opts) 242 { 243 struct vfsopt *opt, *opt2, *tmp; 244 245 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 246 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 247 while (opt2 != NULL) { 248 if (vfs_equalopts(opt->name, opt2->name)) { 249 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 250 vfs_freeopt(opts, opt2); 251 opt2 = tmp; 252 } else { 253 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 254 } 255 } 256 } 257 } 258 259 /* 260 * Build a linked list of mount options from a struct uio. 261 */ 262 int 263 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 264 { 265 struct vfsoptlist *opts; 266 struct vfsopt *opt; 267 size_t memused, namelen, optlen; 268 unsigned int i, iovcnt; 269 int error; 270 271 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 272 TAILQ_INIT(opts); 273 memused = 0; 274 iovcnt = auio->uio_iovcnt; 275 for (i = 0; i < iovcnt; i += 2) { 276 namelen = auio->uio_iov[i].iov_len; 277 optlen = auio->uio_iov[i + 1].iov_len; 278 memused += sizeof(struct vfsopt) + optlen + namelen; 279 /* 280 * Avoid consuming too much memory, and attempts to overflow 281 * memused. 282 */ 283 if (memused > VFS_MOUNTARG_SIZE_MAX || 284 optlen > VFS_MOUNTARG_SIZE_MAX || 285 namelen > VFS_MOUNTARG_SIZE_MAX) { 286 error = EINVAL; 287 goto bad; 288 } 289 290 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 291 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 292 opt->value = NULL; 293 opt->len = 0; 294 opt->pos = i / 2; 295 opt->seen = 0; 296 297 /* 298 * Do this early, so jumps to "bad" will free the current 299 * option. 300 */ 301 TAILQ_INSERT_TAIL(opts, opt, link); 302 303 if (auio->uio_segflg == UIO_SYSSPACE) { 304 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 305 } else { 306 error = copyin(auio->uio_iov[i].iov_base, opt->name, 307 namelen); 308 if (error) 309 goto bad; 310 } 311 /* Ensure names are null-terminated strings. */ 312 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 313 error = EINVAL; 314 goto bad; 315 } 316 if (optlen != 0) { 317 opt->len = optlen; 318 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 319 if (auio->uio_segflg == UIO_SYSSPACE) { 320 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 321 optlen); 322 } else { 323 error = copyin(auio->uio_iov[i + 1].iov_base, 324 opt->value, optlen); 325 if (error) 326 goto bad; 327 } 328 } 329 } 330 vfs_sanitizeopts(opts); 331 *options = opts; 332 return (0); 333 bad: 334 vfs_freeopts(opts); 335 return (error); 336 } 337 338 /* 339 * Merge the old mount options with the new ones passed 340 * in the MNT_UPDATE case. 341 * 342 * XXX: This function will keep a "nofoo" option in the new 343 * options. E.g, if the option's canonical name is "foo", 344 * "nofoo" ends up in the mount point's active options. 345 */ 346 static void 347 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 348 { 349 struct vfsopt *opt, *new; 350 351 TAILQ_FOREACH(opt, oldopts, link) { 352 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 353 new->name = strdup(opt->name, M_MOUNT); 354 if (opt->len != 0) { 355 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 356 bcopy(opt->value, new->value, opt->len); 357 } else 358 new->value = NULL; 359 new->len = opt->len; 360 new->seen = opt->seen; 361 TAILQ_INSERT_HEAD(toopts, new, link); 362 } 363 vfs_sanitizeopts(toopts); 364 } 365 366 /* 367 * Mount a filesystem. 368 */ 369 int 370 sys_nmount(td, uap) 371 struct thread *td; 372 struct nmount_args /* { 373 struct iovec *iovp; 374 unsigned int iovcnt; 375 int flags; 376 } */ *uap; 377 { 378 struct uio *auio; 379 int error; 380 u_int iovcnt; 381 uint64_t flags; 382 383 /* 384 * Mount flags are now 64-bits. On 32-bit archtectures only 385 * 32-bits are passed in, but from here on everything handles 386 * 64-bit flags correctly. 387 */ 388 flags = uap->flags; 389 390 AUDIT_ARG_FFLAGS(flags); 391 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 392 uap->iovp, uap->iovcnt, flags); 393 394 /* 395 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 396 * userspace to set this flag, but we must filter it out if we want 397 * MNT_UPDATE on the root file system to work. 398 * MNT_ROOTFS should only be set by the kernel when mounting its 399 * root file system. 400 */ 401 flags &= ~MNT_ROOTFS; 402 403 iovcnt = uap->iovcnt; 404 /* 405 * Check that we have an even number of iovec's 406 * and that we have at least two options. 407 */ 408 if ((iovcnt & 1) || (iovcnt < 4)) { 409 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 410 uap->iovcnt); 411 return (EINVAL); 412 } 413 414 error = copyinuio(uap->iovp, iovcnt, &auio); 415 if (error) { 416 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 417 __func__, error); 418 return (error); 419 } 420 error = vfs_donmount(td, flags, auio); 421 422 free(auio, M_IOV); 423 return (error); 424 } 425 426 /* 427 * --------------------------------------------------------------------- 428 * Various utility functions 429 */ 430 431 void 432 vfs_ref(struct mount *mp) 433 { 434 435 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 436 MNT_ILOCK(mp); 437 MNT_REF(mp); 438 MNT_IUNLOCK(mp); 439 } 440 441 void 442 vfs_rel(struct mount *mp) 443 { 444 445 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 446 MNT_ILOCK(mp); 447 MNT_REL(mp); 448 MNT_IUNLOCK(mp); 449 } 450 451 /* 452 * Allocate and initialize the mount point struct. 453 */ 454 struct mount * 455 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 456 struct ucred *cred) 457 { 458 struct mount *mp; 459 460 mp = uma_zalloc(mount_zone, M_WAITOK); 461 bzero(&mp->mnt_startzero, 462 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 463 TAILQ_INIT(&mp->mnt_nvnodelist); 464 mp->mnt_nvnodelistsize = 0; 465 mp->mnt_ref = 0; 466 (void) vfs_busy(mp, MBF_NOWAIT); 467 mp->mnt_op = vfsp->vfc_vfsops; 468 mp->mnt_vfc = vfsp; 469 vfsp->vfc_refcount++; /* XXX Unlocked */ 470 mp->mnt_stat.f_type = vfsp->vfc_typenum; 471 mp->mnt_gen++; 472 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 473 mp->mnt_vnodecovered = vp; 474 mp->mnt_cred = crdup(cred); 475 mp->mnt_stat.f_owner = cred->cr_uid; 476 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 477 mp->mnt_iosize_max = DFLTPHYS; 478 #ifdef MAC 479 mac_mount_init(mp); 480 mac_mount_create(cred, mp); 481 #endif 482 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 483 return (mp); 484 } 485 486 /* 487 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 488 */ 489 void 490 vfs_mount_destroy(struct mount *mp) 491 { 492 493 MNT_ILOCK(mp); 494 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 495 if (mp->mnt_kern_flag & MNTK_MWAIT) { 496 mp->mnt_kern_flag &= ~MNTK_MWAIT; 497 wakeup(mp); 498 } 499 while (mp->mnt_ref) 500 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 501 KASSERT(mp->mnt_ref == 0, 502 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 503 __FILE__, __LINE__)); 504 if (mp->mnt_writeopcount != 0) 505 panic("vfs_mount_destroy: nonzero writeopcount"); 506 if (mp->mnt_secondary_writes != 0) 507 panic("vfs_mount_destroy: nonzero secondary_writes"); 508 mp->mnt_vfc->vfc_refcount--; 509 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 510 struct vnode *vp; 511 512 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 513 vprint("", vp); 514 panic("unmount: dangling vnode"); 515 } 516 if (mp->mnt_nvnodelistsize != 0) 517 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 518 if (mp->mnt_lockref != 0) 519 panic("vfs_mount_destroy: nonzero lock refcount"); 520 MNT_IUNLOCK(mp); 521 #ifdef MAC 522 mac_mount_destroy(mp); 523 #endif 524 if (mp->mnt_opt != NULL) 525 vfs_freeopts(mp->mnt_opt); 526 crfree(mp->mnt_cred); 527 uma_zfree(mount_zone, mp); 528 } 529 530 int 531 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 532 { 533 struct vfsoptlist *optlist; 534 struct vfsopt *opt, *tmp_opt; 535 char *fstype, *fspath, *errmsg; 536 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 537 538 errmsg = fspath = NULL; 539 errmsg_len = fspathlen = 0; 540 errmsg_pos = -1; 541 542 error = vfs_buildopts(fsoptions, &optlist); 543 if (error) 544 return (error); 545 546 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 547 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 548 549 /* 550 * We need these two options before the others, 551 * and they are mandatory for any filesystem. 552 * Ensure they are NUL terminated as well. 553 */ 554 fstypelen = 0; 555 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 556 if (error || fstype[fstypelen - 1] != '\0') { 557 error = EINVAL; 558 if (errmsg != NULL) 559 strncpy(errmsg, "Invalid fstype", errmsg_len); 560 goto bail; 561 } 562 fspathlen = 0; 563 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 564 if (error || fspath[fspathlen - 1] != '\0') { 565 error = EINVAL; 566 if (errmsg != NULL) 567 strncpy(errmsg, "Invalid fspath", errmsg_len); 568 goto bail; 569 } 570 571 /* 572 * We need to see if we have the "update" option 573 * before we call vfs_domount(), since vfs_domount() has special 574 * logic based on MNT_UPDATE. This is very important 575 * when we want to update the root filesystem. 576 */ 577 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 578 if (strcmp(opt->name, "update") == 0) { 579 fsflags |= MNT_UPDATE; 580 vfs_freeopt(optlist, opt); 581 } 582 else if (strcmp(opt->name, "async") == 0) 583 fsflags |= MNT_ASYNC; 584 else if (strcmp(opt->name, "force") == 0) { 585 fsflags |= MNT_FORCE; 586 vfs_freeopt(optlist, opt); 587 } 588 else if (strcmp(opt->name, "reload") == 0) { 589 fsflags |= MNT_RELOAD; 590 vfs_freeopt(optlist, opt); 591 } 592 else if (strcmp(opt->name, "multilabel") == 0) 593 fsflags |= MNT_MULTILABEL; 594 else if (strcmp(opt->name, "noasync") == 0) 595 fsflags &= ~MNT_ASYNC; 596 else if (strcmp(opt->name, "noatime") == 0) 597 fsflags |= MNT_NOATIME; 598 else if (strcmp(opt->name, "atime") == 0) { 599 free(opt->name, M_MOUNT); 600 opt->name = strdup("nonoatime", M_MOUNT); 601 } 602 else if (strcmp(opt->name, "noclusterr") == 0) 603 fsflags |= MNT_NOCLUSTERR; 604 else if (strcmp(opt->name, "clusterr") == 0) { 605 free(opt->name, M_MOUNT); 606 opt->name = strdup("nonoclusterr", M_MOUNT); 607 } 608 else if (strcmp(opt->name, "noclusterw") == 0) 609 fsflags |= MNT_NOCLUSTERW; 610 else if (strcmp(opt->name, "clusterw") == 0) { 611 free(opt->name, M_MOUNT); 612 opt->name = strdup("nonoclusterw", M_MOUNT); 613 } 614 else if (strcmp(opt->name, "noexec") == 0) 615 fsflags |= MNT_NOEXEC; 616 else if (strcmp(opt->name, "exec") == 0) { 617 free(opt->name, M_MOUNT); 618 opt->name = strdup("nonoexec", M_MOUNT); 619 } 620 else if (strcmp(opt->name, "nosuid") == 0) 621 fsflags |= MNT_NOSUID; 622 else if (strcmp(opt->name, "suid") == 0) { 623 free(opt->name, M_MOUNT); 624 opt->name = strdup("nonosuid", M_MOUNT); 625 } 626 else if (strcmp(opt->name, "nosymfollow") == 0) 627 fsflags |= MNT_NOSYMFOLLOW; 628 else if (strcmp(opt->name, "symfollow") == 0) { 629 free(opt->name, M_MOUNT); 630 opt->name = strdup("nonosymfollow", M_MOUNT); 631 } 632 else if (strcmp(opt->name, "noro") == 0) 633 fsflags &= ~MNT_RDONLY; 634 else if (strcmp(opt->name, "rw") == 0) 635 fsflags &= ~MNT_RDONLY; 636 else if (strcmp(opt->name, "ro") == 0) 637 fsflags |= MNT_RDONLY; 638 else if (strcmp(opt->name, "rdonly") == 0) { 639 free(opt->name, M_MOUNT); 640 opt->name = strdup("ro", M_MOUNT); 641 fsflags |= MNT_RDONLY; 642 } 643 else if (strcmp(opt->name, "suiddir") == 0) 644 fsflags |= MNT_SUIDDIR; 645 else if (strcmp(opt->name, "sync") == 0) 646 fsflags |= MNT_SYNCHRONOUS; 647 else if (strcmp(opt->name, "union") == 0) 648 fsflags |= MNT_UNION; 649 } 650 651 /* 652 * Be ultra-paranoid about making sure the type and fspath 653 * variables will fit in our mp buffers, including the 654 * terminating NUL. 655 */ 656 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 657 error = ENAMETOOLONG; 658 goto bail; 659 } 660 661 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 662 bail: 663 /* copyout the errmsg */ 664 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 665 && errmsg_len > 0 && errmsg != NULL) { 666 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 667 bcopy(errmsg, 668 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 669 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 670 } else { 671 copyout(errmsg, 672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 673 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 674 } 675 } 676 677 if (optlist != NULL) 678 vfs_freeopts(optlist); 679 return (error); 680 } 681 682 /* 683 * Old mount API. 684 */ 685 #ifndef _SYS_SYSPROTO_H_ 686 struct mount_args { 687 char *type; 688 char *path; 689 int flags; 690 caddr_t data; 691 }; 692 #endif 693 /* ARGSUSED */ 694 int 695 sys_mount(td, uap) 696 struct thread *td; 697 struct mount_args /* { 698 char *type; 699 char *path; 700 int flags; 701 caddr_t data; 702 } */ *uap; 703 { 704 char *fstype; 705 struct vfsconf *vfsp = NULL; 706 struct mntarg *ma = NULL; 707 uint64_t flags; 708 int error; 709 710 /* 711 * Mount flags are now 64-bits. On 32-bit archtectures only 712 * 32-bits are passed in, but from here on everything handles 713 * 64-bit flags correctly. 714 */ 715 flags = uap->flags; 716 717 AUDIT_ARG_FFLAGS(flags); 718 719 /* 720 * Filter out MNT_ROOTFS. We do not want clients of mount() in 721 * userspace to set this flag, but we must filter it out if we want 722 * MNT_UPDATE on the root file system to work. 723 * MNT_ROOTFS should only be set by the kernel when mounting its 724 * root file system. 725 */ 726 flags &= ~MNT_ROOTFS; 727 728 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 729 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 730 if (error) { 731 free(fstype, M_TEMP); 732 return (error); 733 } 734 735 AUDIT_ARG_TEXT(fstype); 736 mtx_lock(&Giant); 737 vfsp = vfs_byname_kld(fstype, td, &error); 738 free(fstype, M_TEMP); 739 if (vfsp == NULL) { 740 mtx_unlock(&Giant); 741 return (ENOENT); 742 } 743 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 744 mtx_unlock(&Giant); 745 return (EOPNOTSUPP); 746 } 747 748 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 749 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 750 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 751 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 752 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 753 754 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 755 mtx_unlock(&Giant); 756 return (error); 757 } 758 759 /* 760 * vfs_domount_first(): first file system mount (not update) 761 */ 762 static int 763 vfs_domount_first( 764 struct thread *td, /* Calling thread. */ 765 struct vfsconf *vfsp, /* File system type. */ 766 char *fspath, /* Mount path. */ 767 struct vnode *vp, /* Vnode to be covered. */ 768 uint64_t fsflags, /* Flags common to all filesystems. */ 769 struct vfsoptlist **optlist /* Options local to the filesystem. */ 770 ) 771 { 772 struct vattr va; 773 struct mount *mp; 774 struct vnode *newdp; 775 int error; 776 777 mtx_assert(&Giant, MA_OWNED); 778 ASSERT_VOP_ELOCKED(vp, __func__); 779 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 780 781 /* 782 * If the user is not root, ensure that they own the directory 783 * onto which we are attempting to mount. 784 */ 785 error = VOP_GETATTR(vp, &va, td->td_ucred); 786 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 787 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 788 if (error == 0) 789 error = vinvalbuf(vp, V_SAVE, 0, 0); 790 if (error == 0 && vp->v_type != VDIR) 791 error = ENOTDIR; 792 if (error == 0) { 793 VI_LOCK(vp); 794 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 795 vp->v_iflag |= VI_MOUNT; 796 else 797 error = EBUSY; 798 VI_UNLOCK(vp); 799 } 800 if (error != 0) { 801 vput(vp); 802 return (error); 803 } 804 VOP_UNLOCK(vp, 0); 805 806 /* Allocate and initialize the filesystem. */ 807 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 808 /* XXXMAC: pass to vfs_mount_alloc? */ 809 mp->mnt_optnew = *optlist; 810 /* Set the mount level flags. */ 811 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 812 813 /* 814 * Mount the filesystem. 815 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 816 * get. No freeing of cn_pnbuf. 817 */ 818 error = VFS_MOUNT(mp); 819 #ifndef VFS_ALLOW_NONMPSAFE 820 if (error == 0 && VFS_NEEDSGIANT(mp)) { 821 (void)VFS_UNMOUNT(mp, fsflags); 822 error = ENXIO; 823 printf("%s: Mounting non-MPSAFE fs (%s) is disabled\n", 824 __func__, mp->mnt_vfc->vfc_name); 825 } 826 #endif 827 if (error != 0) { 828 vfs_unbusy(mp); 829 vfs_mount_destroy(mp); 830 VI_LOCK(vp); 831 vp->v_iflag &= ~VI_MOUNT; 832 VI_UNLOCK(vp); 833 vrele(vp); 834 return (error); 835 } 836 #ifdef VFS_ALLOW_NONMPSAFE 837 if (VFS_NEEDSGIANT(mp)) 838 printf("%s: Mounting non-MPSAFE fs (%s) is deprecated\n", 839 __func__, mp->mnt_vfc->vfc_name); 840 #endif 841 842 if (mp->mnt_opt != NULL) 843 vfs_freeopts(mp->mnt_opt); 844 mp->mnt_opt = mp->mnt_optnew; 845 *optlist = NULL; 846 (void)VFS_STATFS(mp, &mp->mnt_stat); 847 848 /* 849 * Prevent external consumers of mount options from reading mnt_optnew. 850 */ 851 mp->mnt_optnew = NULL; 852 853 MNT_ILOCK(mp); 854 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 855 mp->mnt_kern_flag |= MNTK_ASYNC; 856 else 857 mp->mnt_kern_flag &= ~MNTK_ASYNC; 858 MNT_IUNLOCK(mp); 859 860 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 861 cache_purge(vp); 862 VI_LOCK(vp); 863 vp->v_iflag &= ~VI_MOUNT; 864 VI_UNLOCK(vp); 865 vp->v_mountedhere = mp; 866 /* Place the new filesystem at the end of the mount list. */ 867 mtx_lock(&mountlist_mtx); 868 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 869 mtx_unlock(&mountlist_mtx); 870 vfs_event_signal(NULL, VQ_MOUNT, 0); 871 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 872 panic("mount: lost mount"); 873 VOP_UNLOCK(newdp, 0); 874 VOP_UNLOCK(vp, 0); 875 mountcheckdirs(vp, newdp); 876 vrele(newdp); 877 if ((mp->mnt_flag & MNT_RDONLY) == 0) 878 vfs_allocate_syncvnode(mp); 879 vfs_unbusy(mp); 880 return (0); 881 } 882 883 /* 884 * vfs_domount_update(): update of mounted file system 885 */ 886 static int 887 vfs_domount_update( 888 struct thread *td, /* Calling thread. */ 889 struct vnode *vp, /* Mount point vnode. */ 890 uint64_t fsflags, /* Flags common to all filesystems. */ 891 struct vfsoptlist **optlist /* Options local to the filesystem. */ 892 ) 893 { 894 struct oexport_args oexport; 895 struct export_args export; 896 struct mount *mp; 897 int error, export_error; 898 uint64_t flag; 899 900 mtx_assert(&Giant, MA_OWNED); 901 ASSERT_VOP_ELOCKED(vp, __func__); 902 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 903 904 if ((vp->v_vflag & VV_ROOT) == 0) { 905 vput(vp); 906 return (EINVAL); 907 } 908 mp = vp->v_mount; 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 if (error == 0) { 961 /* Process the export option. */ 962 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 963 sizeof(export)) == 0) { 964 export_error = vfs_export(mp, &export); 965 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 966 sizeof(oexport)) == 0) { 967 export.ex_flags = oexport.ex_flags; 968 export.ex_root = oexport.ex_root; 969 export.ex_anon = oexport.ex_anon; 970 export.ex_addr = oexport.ex_addr; 971 export.ex_addrlen = oexport.ex_addrlen; 972 export.ex_mask = oexport.ex_mask; 973 export.ex_masklen = oexport.ex_masklen; 974 export.ex_indexfile = oexport.ex_indexfile; 975 export.ex_numsecflavors = 0; 976 export_error = vfs_export(mp, &export); 977 } 978 } 979 980 MNT_ILOCK(mp); 981 if (error == 0) { 982 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 983 MNT_SNAPSHOT); 984 } else { 985 /* 986 * If we fail, restore old mount flags. MNT_QUOTA is special, 987 * because it is not part of MNT_UPDATEMASK, but it could have 988 * changed in the meantime if quotactl(2) was called. 989 * All in all we want current value of MNT_QUOTA, not the old 990 * one. 991 */ 992 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 993 } 994 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 995 mp->mnt_kern_flag |= MNTK_ASYNC; 996 else 997 mp->mnt_kern_flag &= ~MNTK_ASYNC; 998 MNT_IUNLOCK(mp); 999 1000 if (error != 0) 1001 goto end; 1002 1003 if (mp->mnt_opt != NULL) 1004 vfs_freeopts(mp->mnt_opt); 1005 mp->mnt_opt = mp->mnt_optnew; 1006 *optlist = NULL; 1007 (void)VFS_STATFS(mp, &mp->mnt_stat); 1008 /* 1009 * Prevent external consumers of mount options from reading 1010 * mnt_optnew. 1011 */ 1012 mp->mnt_optnew = NULL; 1013 1014 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1015 vfs_allocate_syncvnode(mp); 1016 else 1017 vfs_deallocate_syncvnode(mp); 1018 end: 1019 vfs_unbusy(mp); 1020 VI_LOCK(vp); 1021 vp->v_iflag &= ~VI_MOUNT; 1022 VI_UNLOCK(vp); 1023 vrele(vp); 1024 return (error != 0 ? error : export_error); 1025 } 1026 1027 /* 1028 * vfs_domount(): actually attempt a filesystem mount. 1029 */ 1030 static int 1031 vfs_domount( 1032 struct thread *td, /* Calling thread. */ 1033 const char *fstype, /* Filesystem type. */ 1034 char *fspath, /* Mount path. */ 1035 uint64_t fsflags, /* Flags common to all filesystems. */ 1036 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1037 ) 1038 { 1039 struct vfsconf *vfsp; 1040 struct nameidata nd; 1041 struct vnode *vp; 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 | MPSAFE | AUDITVNODE1, 1096 UIO_SYSSPACE, fspath, td); 1097 error = namei(&nd); 1098 if (error != 0) 1099 return (error); 1100 if (!NDHASGIANT(&nd)) 1101 mtx_lock(&Giant); 1102 NDFREE(&nd, NDF_ONLY_PNBUF); 1103 vp = nd.ni_vp; 1104 if ((fsflags & MNT_UPDATE) == 0) { 1105 error = vn_path_to_global_path(td, vp, fspath, MNAMELEN); 1106 /* debug.disablefullpath == 1 results in ENODEV */ 1107 if (error == 0 || error == ENODEV) { 1108 error = vfs_domount_first(td, vfsp, fspath, vp, 1109 fsflags, optlist); 1110 } 1111 } else 1112 error = vfs_domount_update(td, vp, fsflags, optlist); 1113 mtx_unlock(&Giant); 1114 1115 ASSERT_VI_UNLOCKED(vp, __func__); 1116 ASSERT_VOP_UNLOCKED(vp, __func__); 1117 1118 return (error); 1119 } 1120 1121 /* 1122 * Unmount a filesystem. 1123 * 1124 * Note: unmount takes a path to the vnode mounted on as argument, not 1125 * special file (as before). 1126 */ 1127 #ifndef _SYS_SYSPROTO_H_ 1128 struct unmount_args { 1129 char *path; 1130 int flags; 1131 }; 1132 #endif 1133 /* ARGSUSED */ 1134 int 1135 sys_unmount(td, uap) 1136 struct thread *td; 1137 register struct unmount_args /* { 1138 char *path; 1139 int flags; 1140 } */ *uap; 1141 { 1142 struct nameidata nd; 1143 struct mount *mp; 1144 char *pathbuf; 1145 int error, id0, id1, vfslocked; 1146 1147 AUDIT_ARG_VALUE(uap->flags); 1148 if (jailed(td->td_ucred) || usermount == 0) { 1149 error = priv_check(td, PRIV_VFS_UNMOUNT); 1150 if (error) 1151 return (error); 1152 } 1153 1154 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1155 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1156 if (error) { 1157 free(pathbuf, M_TEMP); 1158 return (error); 1159 } 1160 mtx_lock(&Giant); 1161 if (uap->flags & MNT_BYFSID) { 1162 AUDIT_ARG_TEXT(pathbuf); 1163 /* Decode the filesystem ID. */ 1164 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1165 mtx_unlock(&Giant); 1166 free(pathbuf, M_TEMP); 1167 return (EINVAL); 1168 } 1169 1170 mtx_lock(&mountlist_mtx); 1171 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1172 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1173 mp->mnt_stat.f_fsid.val[1] == id1) 1174 break; 1175 } 1176 mtx_unlock(&mountlist_mtx); 1177 } else { 1178 AUDIT_ARG_UPATH1(td, pathbuf); 1179 /* 1180 * Try to find global path for path argument. 1181 */ 1182 NDINIT(&nd, LOOKUP, 1183 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1184 UIO_SYSSPACE, pathbuf, td); 1185 if (namei(&nd) == 0) { 1186 vfslocked = NDHASGIANT(&nd); 1187 NDFREE(&nd, NDF_ONLY_PNBUF); 1188 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1189 MNAMELEN); 1190 if (error == 0 || error == ENODEV) 1191 vput(nd.ni_vp); 1192 VFS_UNLOCK_GIANT(vfslocked); 1193 } 1194 mtx_lock(&mountlist_mtx); 1195 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1196 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1197 break; 1198 } 1199 mtx_unlock(&mountlist_mtx); 1200 } 1201 free(pathbuf, M_TEMP); 1202 if (mp == NULL) { 1203 /* 1204 * Previously we returned ENOENT for a nonexistent path and 1205 * EINVAL for a non-mountpoint. We cannot tell these apart 1206 * now, so in the !MNT_BYFSID case return the more likely 1207 * EINVAL for compatibility. 1208 */ 1209 mtx_unlock(&Giant); 1210 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1211 } 1212 1213 /* 1214 * Don't allow unmounting the root filesystem. 1215 */ 1216 if (mp->mnt_flag & MNT_ROOTFS) { 1217 mtx_unlock(&Giant); 1218 return (EINVAL); 1219 } 1220 error = dounmount(mp, uap->flags, td); 1221 mtx_unlock(&Giant); 1222 return (error); 1223 } 1224 1225 /* 1226 * Do the actual filesystem unmount. 1227 */ 1228 int 1229 dounmount(mp, flags, td) 1230 struct mount *mp; 1231 int flags; 1232 struct thread *td; 1233 { 1234 struct vnode *coveredvp, *fsrootvp; 1235 int error; 1236 uint64_t async_flag; 1237 int mnt_gen_r; 1238 1239 mtx_assert(&Giant, MA_OWNED); 1240 1241 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1242 mnt_gen_r = mp->mnt_gen; 1243 VI_LOCK(coveredvp); 1244 vholdl(coveredvp); 1245 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1246 vdrop(coveredvp); 1247 /* 1248 * Check for mp being unmounted while waiting for the 1249 * covered vnode lock. 1250 */ 1251 if (coveredvp->v_mountedhere != mp || 1252 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1253 VOP_UNLOCK(coveredvp, 0); 1254 return (EBUSY); 1255 } 1256 } 1257 /* 1258 * Only privileged root, or (if MNT_USER is set) the user that did the 1259 * original mount is permitted to unmount this filesystem. 1260 */ 1261 error = vfs_suser(mp, td); 1262 if (error) { 1263 if (coveredvp) 1264 VOP_UNLOCK(coveredvp, 0); 1265 return (error); 1266 } 1267 1268 MNT_ILOCK(mp); 1269 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1270 MNT_IUNLOCK(mp); 1271 if (coveredvp) 1272 VOP_UNLOCK(coveredvp, 0); 1273 return (EBUSY); 1274 } 1275 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1276 /* Allow filesystems to detect that a forced unmount is in progress. */ 1277 if (flags & MNT_FORCE) 1278 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1279 error = 0; 1280 if (mp->mnt_lockref) { 1281 mp->mnt_kern_flag |= MNTK_DRAINING; 1282 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1283 "mount drain", 0); 1284 } 1285 MNT_IUNLOCK(mp); 1286 KASSERT(mp->mnt_lockref == 0, 1287 ("%s: invalid lock refcount in the drain path @ %s:%d", 1288 __func__, __FILE__, __LINE__)); 1289 KASSERT(error == 0, 1290 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1291 __func__, __FILE__, __LINE__)); 1292 vn_start_write(NULL, &mp, V_WAIT); 1293 1294 if (mp->mnt_flag & MNT_EXPUBLIC) 1295 vfs_setpublicfs(NULL, NULL, NULL); 1296 1297 vfs_msync(mp, MNT_WAIT); 1298 MNT_ILOCK(mp); 1299 async_flag = mp->mnt_flag & MNT_ASYNC; 1300 mp->mnt_flag &= ~MNT_ASYNC; 1301 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1302 MNT_IUNLOCK(mp); 1303 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1304 vfs_deallocate_syncvnode(mp); 1305 /* 1306 * For forced unmounts, move process cdir/rdir refs on the fs root 1307 * vnode to the covered vnode. For non-forced unmounts we want 1308 * such references to cause an EBUSY error. 1309 */ 1310 if ((flags & MNT_FORCE) && 1311 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1312 if (mp->mnt_vnodecovered != NULL) 1313 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1314 if (fsrootvp == rootvnode) { 1315 vrele(rootvnode); 1316 rootvnode = NULL; 1317 } 1318 vput(fsrootvp); 1319 } 1320 if (((mp->mnt_flag & MNT_RDONLY) || 1321 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1322 error = VFS_UNMOUNT(mp, flags); 1323 vn_finished_write(mp); 1324 /* 1325 * If we failed to flush the dirty blocks for this mount point, 1326 * undo all the cdir/rdir and rootvnode changes we made above. 1327 * Unless we failed to do so because the device is reporting that 1328 * it doesn't exist anymore. 1329 */ 1330 if (error && error != ENXIO) { 1331 if ((flags & MNT_FORCE) && 1332 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1333 if (mp->mnt_vnodecovered != NULL) 1334 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1335 if (rootvnode == NULL) { 1336 rootvnode = fsrootvp; 1337 vref(rootvnode); 1338 } 1339 vput(fsrootvp); 1340 } 1341 MNT_ILOCK(mp); 1342 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1343 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1344 MNT_IUNLOCK(mp); 1345 vfs_allocate_syncvnode(mp); 1346 MNT_ILOCK(mp); 1347 } 1348 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1349 mp->mnt_flag |= async_flag; 1350 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1351 mp->mnt_kern_flag |= MNTK_ASYNC; 1352 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1353 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1354 wakeup(mp); 1355 } 1356 MNT_IUNLOCK(mp); 1357 if (coveredvp) 1358 VOP_UNLOCK(coveredvp, 0); 1359 return (error); 1360 } 1361 mtx_lock(&mountlist_mtx); 1362 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1363 mtx_unlock(&mountlist_mtx); 1364 if (coveredvp != NULL) { 1365 coveredvp->v_mountedhere = NULL; 1366 vput(coveredvp); 1367 } 1368 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1369 vfs_mount_destroy(mp); 1370 return (0); 1371 } 1372 1373 /* 1374 * Report errors during filesystem mounting. 1375 */ 1376 void 1377 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1378 { 1379 struct vfsoptlist *moptlist = mp->mnt_optnew; 1380 va_list ap; 1381 int error, len; 1382 char *errmsg; 1383 1384 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1385 if (error || errmsg == NULL || len <= 0) 1386 return; 1387 1388 va_start(ap, fmt); 1389 vsnprintf(errmsg, (size_t)len, fmt, ap); 1390 va_end(ap); 1391 } 1392 1393 void 1394 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1395 { 1396 va_list ap; 1397 int error, len; 1398 char *errmsg; 1399 1400 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1401 if (error || errmsg == NULL || len <= 0) 1402 return; 1403 1404 va_start(ap, fmt); 1405 vsnprintf(errmsg, (size_t)len, fmt, ap); 1406 va_end(ap); 1407 } 1408 1409 /* 1410 * --------------------------------------------------------------------- 1411 * Functions for querying mount options/arguments from filesystems. 1412 */ 1413 1414 /* 1415 * Check that no unknown options are given 1416 */ 1417 int 1418 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1419 { 1420 struct vfsopt *opt; 1421 char errmsg[255]; 1422 const char **t, *p, *q; 1423 int ret = 0; 1424 1425 TAILQ_FOREACH(opt, opts, link) { 1426 p = opt->name; 1427 q = NULL; 1428 if (p[0] == 'n' && p[1] == 'o') 1429 q = p + 2; 1430 for(t = global_opts; *t != NULL; t++) { 1431 if (strcmp(*t, p) == 0) 1432 break; 1433 if (q != NULL) { 1434 if (strcmp(*t, q) == 0) 1435 break; 1436 } 1437 } 1438 if (*t != NULL) 1439 continue; 1440 for(t = legal; *t != NULL; t++) { 1441 if (strcmp(*t, p) == 0) 1442 break; 1443 if (q != NULL) { 1444 if (strcmp(*t, q) == 0) 1445 break; 1446 } 1447 } 1448 if (*t != NULL) 1449 continue; 1450 snprintf(errmsg, sizeof(errmsg), 1451 "mount option <%s> is unknown", p); 1452 ret = EINVAL; 1453 } 1454 if (ret != 0) { 1455 TAILQ_FOREACH(opt, opts, link) { 1456 if (strcmp(opt->name, "errmsg") == 0) { 1457 strncpy((char *)opt->value, errmsg, opt->len); 1458 break; 1459 } 1460 } 1461 if (opt == NULL) 1462 printf("%s\n", errmsg); 1463 } 1464 return (ret); 1465 } 1466 1467 /* 1468 * Get a mount option by its name. 1469 * 1470 * Return 0 if the option was found, ENOENT otherwise. 1471 * If len is non-NULL it will be filled with the length 1472 * of the option. If buf is non-NULL, it will be filled 1473 * with the address of the option. 1474 */ 1475 int 1476 vfs_getopt(opts, name, buf, len) 1477 struct vfsoptlist *opts; 1478 const char *name; 1479 void **buf; 1480 int *len; 1481 { 1482 struct vfsopt *opt; 1483 1484 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1485 1486 TAILQ_FOREACH(opt, opts, link) { 1487 if (strcmp(name, opt->name) == 0) { 1488 opt->seen = 1; 1489 if (len != NULL) 1490 *len = opt->len; 1491 if (buf != NULL) 1492 *buf = opt->value; 1493 return (0); 1494 } 1495 } 1496 return (ENOENT); 1497 } 1498 1499 int 1500 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1501 { 1502 struct vfsopt *opt; 1503 1504 if (opts == NULL) 1505 return (-1); 1506 1507 TAILQ_FOREACH(opt, opts, link) { 1508 if (strcmp(name, opt->name) == 0) { 1509 opt->seen = 1; 1510 return (opt->pos); 1511 } 1512 } 1513 return (-1); 1514 } 1515 1516 char * 1517 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1518 { 1519 struct vfsopt *opt; 1520 1521 *error = 0; 1522 TAILQ_FOREACH(opt, opts, link) { 1523 if (strcmp(name, opt->name) != 0) 1524 continue; 1525 opt->seen = 1; 1526 if (opt->len == 0 || 1527 ((char *)opt->value)[opt->len - 1] != '\0') { 1528 *error = EINVAL; 1529 return (NULL); 1530 } 1531 return (opt->value); 1532 } 1533 *error = ENOENT; 1534 return (NULL); 1535 } 1536 1537 int 1538 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1539 uint64_t val) 1540 { 1541 struct vfsopt *opt; 1542 1543 TAILQ_FOREACH(opt, opts, link) { 1544 if (strcmp(name, opt->name) == 0) { 1545 opt->seen = 1; 1546 if (w != NULL) 1547 *w |= val; 1548 return (1); 1549 } 1550 } 1551 if (w != NULL) 1552 *w &= ~val; 1553 return (0); 1554 } 1555 1556 int 1557 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1558 { 1559 va_list ap; 1560 struct vfsopt *opt; 1561 int ret; 1562 1563 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1564 1565 TAILQ_FOREACH(opt, opts, link) { 1566 if (strcmp(name, opt->name) != 0) 1567 continue; 1568 opt->seen = 1; 1569 if (opt->len == 0 || opt->value == NULL) 1570 return (0); 1571 if (((char *)opt->value)[opt->len - 1] != '\0') 1572 return (0); 1573 va_start(ap, fmt); 1574 ret = vsscanf(opt->value, fmt, ap); 1575 va_end(ap); 1576 return (ret); 1577 } 1578 return (0); 1579 } 1580 1581 int 1582 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1583 { 1584 struct vfsopt *opt; 1585 1586 TAILQ_FOREACH(opt, opts, link) { 1587 if (strcmp(name, opt->name) != 0) 1588 continue; 1589 opt->seen = 1; 1590 if (opt->value == NULL) 1591 opt->len = len; 1592 else { 1593 if (opt->len != len) 1594 return (EINVAL); 1595 bcopy(value, opt->value, len); 1596 } 1597 return (0); 1598 } 1599 return (ENOENT); 1600 } 1601 1602 int 1603 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1604 { 1605 struct vfsopt *opt; 1606 1607 TAILQ_FOREACH(opt, opts, link) { 1608 if (strcmp(name, opt->name) != 0) 1609 continue; 1610 opt->seen = 1; 1611 if (opt->value == NULL) 1612 opt->len = len; 1613 else { 1614 if (opt->len < len) 1615 return (EINVAL); 1616 opt->len = len; 1617 bcopy(value, opt->value, len); 1618 } 1619 return (0); 1620 } 1621 return (ENOENT); 1622 } 1623 1624 int 1625 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1626 { 1627 struct vfsopt *opt; 1628 1629 TAILQ_FOREACH(opt, opts, link) { 1630 if (strcmp(name, opt->name) != 0) 1631 continue; 1632 opt->seen = 1; 1633 if (opt->value == NULL) 1634 opt->len = strlen(value) + 1; 1635 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1636 return (EINVAL); 1637 return (0); 1638 } 1639 return (ENOENT); 1640 } 1641 1642 /* 1643 * Find and copy a mount option. 1644 * 1645 * The size of the buffer has to be specified 1646 * in len, if it is not the same length as the 1647 * mount option, EINVAL is returned. 1648 * Returns ENOENT if the option is not found. 1649 */ 1650 int 1651 vfs_copyopt(opts, name, dest, len) 1652 struct vfsoptlist *opts; 1653 const char *name; 1654 void *dest; 1655 int len; 1656 { 1657 struct vfsopt *opt; 1658 1659 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1660 1661 TAILQ_FOREACH(opt, opts, link) { 1662 if (strcmp(name, opt->name) == 0) { 1663 opt->seen = 1; 1664 if (len != opt->len) 1665 return (EINVAL); 1666 bcopy(opt->value, dest, opt->len); 1667 return (0); 1668 } 1669 } 1670 return (ENOENT); 1671 } 1672 1673 /* 1674 * This is a helper function for filesystems to traverse their 1675 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1676 */ 1677 1678 struct vnode * 1679 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1680 { 1681 struct vnode *vp; 1682 1683 mtx_assert(MNT_MTX(mp), MA_OWNED); 1684 1685 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1686 if (should_yield()) { 1687 MNT_IUNLOCK(mp); 1688 kern_yield(PRI_UNCHANGED); 1689 MNT_ILOCK(mp); 1690 } 1691 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1692 while (vp != NULL && vp->v_type == VMARKER) 1693 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1694 1695 /* Check if we are done */ 1696 if (vp == NULL) { 1697 __mnt_vnode_markerfree(mvp, mp); 1698 return (NULL); 1699 } 1700 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1701 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1702 return (vp); 1703 } 1704 1705 struct vnode * 1706 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1707 { 1708 struct vnode *vp; 1709 1710 mtx_assert(MNT_MTX(mp), MA_OWNED); 1711 1712 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1713 while (vp != NULL && vp->v_type == VMARKER) 1714 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1715 1716 /* Check if we are done */ 1717 if (vp == NULL) { 1718 *mvp = NULL; 1719 return (NULL); 1720 } 1721 MNT_REF(mp); 1722 MNT_IUNLOCK(mp); 1723 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1724 M_VNODE_MARKER, 1725 M_WAITOK | M_ZERO); 1726 MNT_ILOCK(mp); 1727 (*mvp)->v_type = VMARKER; 1728 1729 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1730 while (vp != NULL && vp->v_type == VMARKER) 1731 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1732 1733 /* Check if we are done */ 1734 if (vp == NULL) { 1735 MNT_IUNLOCK(mp); 1736 free(*mvp, M_VNODE_MARKER); 1737 MNT_ILOCK(mp); 1738 *mvp = NULL; 1739 MNT_REL(mp); 1740 return (NULL); 1741 } 1742 (*mvp)->v_mount = mp; 1743 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1744 return (vp); 1745 } 1746 1747 1748 void 1749 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1750 { 1751 1752 if (*mvp == NULL) 1753 return; 1754 1755 mtx_assert(MNT_MTX(mp), MA_OWNED); 1756 1757 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1758 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1759 MNT_IUNLOCK(mp); 1760 free(*mvp, M_VNODE_MARKER); 1761 MNT_ILOCK(mp); 1762 *mvp = NULL; 1763 MNT_REL(mp); 1764 } 1765 1766 1767 int 1768 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1769 { 1770 int error; 1771 1772 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1773 if (sbp != &mp->mnt_stat) 1774 *sbp = mp->mnt_stat; 1775 return (error); 1776 } 1777 1778 void 1779 vfs_mountedfrom(struct mount *mp, const char *from) 1780 { 1781 1782 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1783 strlcpy(mp->mnt_stat.f_mntfromname, from, 1784 sizeof mp->mnt_stat.f_mntfromname); 1785 } 1786 1787 /* 1788 * --------------------------------------------------------------------- 1789 * This is the api for building mount args and mounting filesystems from 1790 * inside the kernel. 1791 * 1792 * The API works by accumulation of individual args. First error is 1793 * latched. 1794 * 1795 * XXX: should be documented in new manpage kernel_mount(9) 1796 */ 1797 1798 /* A memory allocation which must be freed when we are done */ 1799 struct mntaarg { 1800 SLIST_ENTRY(mntaarg) next; 1801 }; 1802 1803 /* The header for the mount arguments */ 1804 struct mntarg { 1805 struct iovec *v; 1806 int len; 1807 int error; 1808 SLIST_HEAD(, mntaarg) list; 1809 }; 1810 1811 /* 1812 * Add a boolean argument. 1813 * 1814 * flag is the boolean value. 1815 * name must start with "no". 1816 */ 1817 struct mntarg * 1818 mount_argb(struct mntarg *ma, int flag, const char *name) 1819 { 1820 1821 KASSERT(name[0] == 'n' && name[1] == 'o', 1822 ("mount_argb(...,%s): name must start with 'no'", name)); 1823 1824 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1825 } 1826 1827 /* 1828 * Add an argument printf style 1829 */ 1830 struct mntarg * 1831 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1832 { 1833 va_list ap; 1834 struct mntaarg *maa; 1835 struct sbuf *sb; 1836 int len; 1837 1838 if (ma == NULL) { 1839 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1840 SLIST_INIT(&ma->list); 1841 } 1842 if (ma->error) 1843 return (ma); 1844 1845 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1846 M_MOUNT, M_WAITOK); 1847 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1848 ma->v[ma->len].iov_len = strlen(name) + 1; 1849 ma->len++; 1850 1851 sb = sbuf_new_auto(); 1852 va_start(ap, fmt); 1853 sbuf_vprintf(sb, fmt, ap); 1854 va_end(ap); 1855 sbuf_finish(sb); 1856 len = sbuf_len(sb) + 1; 1857 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1858 SLIST_INSERT_HEAD(&ma->list, maa, next); 1859 bcopy(sbuf_data(sb), maa + 1, len); 1860 sbuf_delete(sb); 1861 1862 ma->v[ma->len].iov_base = maa + 1; 1863 ma->v[ma->len].iov_len = len; 1864 ma->len++; 1865 1866 return (ma); 1867 } 1868 1869 /* 1870 * Add an argument which is a userland string. 1871 */ 1872 struct mntarg * 1873 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1874 { 1875 struct mntaarg *maa; 1876 char *tbuf; 1877 1878 if (val == NULL) 1879 return (ma); 1880 if (ma == NULL) { 1881 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1882 SLIST_INIT(&ma->list); 1883 } 1884 if (ma->error) 1885 return (ma); 1886 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1887 SLIST_INSERT_HEAD(&ma->list, maa, next); 1888 tbuf = (void *)(maa + 1); 1889 ma->error = copyinstr(val, tbuf, len, NULL); 1890 return (mount_arg(ma, name, tbuf, -1)); 1891 } 1892 1893 /* 1894 * Plain argument. 1895 * 1896 * If length is -1, treat value as a C string. 1897 */ 1898 struct mntarg * 1899 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1900 { 1901 1902 if (ma == NULL) { 1903 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1904 SLIST_INIT(&ma->list); 1905 } 1906 if (ma->error) 1907 return (ma); 1908 1909 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1910 M_MOUNT, M_WAITOK); 1911 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1912 ma->v[ma->len].iov_len = strlen(name) + 1; 1913 ma->len++; 1914 1915 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1916 if (len < 0) 1917 ma->v[ma->len].iov_len = strlen(val) + 1; 1918 else 1919 ma->v[ma->len].iov_len = len; 1920 ma->len++; 1921 return (ma); 1922 } 1923 1924 /* 1925 * Free a mntarg structure 1926 */ 1927 static void 1928 free_mntarg(struct mntarg *ma) 1929 { 1930 struct mntaarg *maa; 1931 1932 while (!SLIST_EMPTY(&ma->list)) { 1933 maa = SLIST_FIRST(&ma->list); 1934 SLIST_REMOVE_HEAD(&ma->list, next); 1935 free(maa, M_MOUNT); 1936 } 1937 free(ma->v, M_MOUNT); 1938 free(ma, M_MOUNT); 1939 } 1940 1941 /* 1942 * Mount a filesystem 1943 */ 1944 int 1945 kernel_mount(struct mntarg *ma, uint64_t flags) 1946 { 1947 struct uio auio; 1948 int error; 1949 1950 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1951 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1952 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1953 1954 auio.uio_iov = ma->v; 1955 auio.uio_iovcnt = ma->len; 1956 auio.uio_segflg = UIO_SYSSPACE; 1957 1958 error = ma->error; 1959 if (!error) 1960 error = vfs_donmount(curthread, flags, &auio); 1961 free_mntarg(ma); 1962 return (error); 1963 } 1964 1965 /* 1966 * A printflike function to mount a filesystem. 1967 */ 1968 int 1969 kernel_vmount(int flags, ...) 1970 { 1971 struct mntarg *ma = NULL; 1972 va_list ap; 1973 const char *cp; 1974 const void *vp; 1975 int error; 1976 1977 va_start(ap, flags); 1978 for (;;) { 1979 cp = va_arg(ap, const char *); 1980 if (cp == NULL) 1981 break; 1982 vp = va_arg(ap, const void *); 1983 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1984 } 1985 va_end(ap); 1986 1987 error = kernel_mount(ma, flags); 1988 return (error); 1989 } 1990 1991 void 1992 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1993 { 1994 1995 bcopy(oexp, exp, sizeof(*oexp)); 1996 exp->ex_numsecflavors = 0; 1997 } 1998