1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/fcntl.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/filedesc.h> 53 #include <sys/reboot.h> 54 #include <sys/sbuf.h> 55 #include <sys/syscallsubr.h> 56 #include <sys/sysproto.h> 57 #include <sys/sx.h> 58 #include <sys/sysctl.h> 59 #include <sys/sysent.h> 60 #include <sys/systm.h> 61 #include <sys/vnode.h> 62 #include <vm/uma.h> 63 64 #include <geom/geom.h> 65 66 #include <machine/stdarg.h> 67 68 #include <security/audit/audit.h> 69 #include <security/mac/mac_framework.h> 70 71 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 72 73 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 74 uint64_t fsflags, struct vfsoptlist **optlist); 75 static void free_mntarg(struct mntarg *ma); 76 77 static int usermount = 0; 78 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 79 "Unprivileged users may mount and unmount file systems"); 80 81 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 82 static uma_zone_t mount_zone; 83 84 /* List of mounted filesystems. */ 85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87 /* For any iteration/modification of mountlist */ 88 struct mtx mountlist_mtx; 89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91 /* 92 * Global opts, taken by all filesystems 93 */ 94 static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103 }; 104 105 static int 106 mount_init(void *mem, int size, int flags) 107 { 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF); 113 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 114 return (0); 115 } 116 117 static void 118 mount_fini(void *mem, int size) 119 { 120 struct mount *mp; 121 122 mp = (struct mount *)mem; 123 lockdestroy(&mp->mnt_explock); 124 mtx_destroy(&mp->mnt_listmtx); 125 mtx_destroy(&mp->mnt_mtx); 126 } 127 128 static void 129 vfs_mount_init(void *dummy __unused) 130 { 131 132 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 133 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 134 } 135 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 136 137 /* 138 * --------------------------------------------------------------------- 139 * Functions for building and sanitizing the mount options 140 */ 141 142 /* Remove one mount option. */ 143 static void 144 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 145 { 146 147 TAILQ_REMOVE(opts, opt, link); 148 free(opt->name, M_MOUNT); 149 if (opt->value != NULL) 150 free(opt->value, M_MOUNT); 151 free(opt, M_MOUNT); 152 } 153 154 /* Release all resources related to the mount options. */ 155 void 156 vfs_freeopts(struct vfsoptlist *opts) 157 { 158 struct vfsopt *opt; 159 160 while (!TAILQ_EMPTY(opts)) { 161 opt = TAILQ_FIRST(opts); 162 vfs_freeopt(opts, opt); 163 } 164 free(opts, M_MOUNT); 165 } 166 167 void 168 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 169 { 170 struct vfsopt *opt, *temp; 171 172 if (opts == NULL) 173 return; 174 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 175 if (strcmp(opt->name, name) == 0) 176 vfs_freeopt(opts, opt); 177 } 178 } 179 180 static int 181 vfs_isopt_ro(const char *opt) 182 { 183 184 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 185 strcmp(opt, "norw") == 0) 186 return (1); 187 return (0); 188 } 189 190 static int 191 vfs_isopt_rw(const char *opt) 192 { 193 194 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 195 return (1); 196 return (0); 197 } 198 199 /* 200 * Check if options are equal (with or without the "no" prefix). 201 */ 202 static int 203 vfs_equalopts(const char *opt1, const char *opt2) 204 { 205 char *p; 206 207 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 208 if (strcmp(opt1, opt2) == 0) 209 return (1); 210 /* "noopt" vs. "opt" */ 211 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 212 return (1); 213 /* "opt" vs. "noopt" */ 214 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 215 return (1); 216 while ((p = strchr(opt1, '.')) != NULL && 217 !strncmp(opt1, opt2, ++p - opt1)) { 218 opt2 += p - opt1; 219 opt1 = p; 220 /* "foo.noopt" vs. "foo.opt" */ 221 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 222 return (1); 223 /* "foo.opt" vs. "foo.noopt" */ 224 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 225 return (1); 226 } 227 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 228 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 229 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 230 return (1); 231 return (0); 232 } 233 234 /* 235 * If a mount option is specified several times, 236 * (with or without the "no" prefix) only keep 237 * the last occurrence of it. 238 */ 239 static void 240 vfs_sanitizeopts(struct vfsoptlist *opts) 241 { 242 struct vfsopt *opt, *opt2, *tmp; 243 244 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 245 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 246 while (opt2 != NULL) { 247 if (vfs_equalopts(opt->name, opt2->name)) { 248 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 249 vfs_freeopt(opts, opt2); 250 opt2 = tmp; 251 } else { 252 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 253 } 254 } 255 } 256 } 257 258 /* 259 * Build a linked list of mount options from a struct uio. 260 */ 261 int 262 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 263 { 264 struct vfsoptlist *opts; 265 struct vfsopt *opt; 266 size_t memused, namelen, optlen; 267 unsigned int i, iovcnt; 268 int error; 269 270 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 271 TAILQ_INIT(opts); 272 memused = 0; 273 iovcnt = auio->uio_iovcnt; 274 for (i = 0; i < iovcnt; i += 2) { 275 namelen = auio->uio_iov[i].iov_len; 276 optlen = auio->uio_iov[i + 1].iov_len; 277 memused += sizeof(struct vfsopt) + optlen + namelen; 278 /* 279 * Avoid consuming too much memory, and attempts to overflow 280 * memused. 281 */ 282 if (memused > VFS_MOUNTARG_SIZE_MAX || 283 optlen > VFS_MOUNTARG_SIZE_MAX || 284 namelen > VFS_MOUNTARG_SIZE_MAX) { 285 error = EINVAL; 286 goto bad; 287 } 288 289 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 290 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 291 opt->value = NULL; 292 opt->len = 0; 293 opt->pos = i / 2; 294 opt->seen = 0; 295 296 /* 297 * Do this early, so jumps to "bad" will free the current 298 * option. 299 */ 300 TAILQ_INSERT_TAIL(opts, opt, link); 301 302 if (auio->uio_segflg == UIO_SYSSPACE) { 303 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 304 } else { 305 error = copyin(auio->uio_iov[i].iov_base, opt->name, 306 namelen); 307 if (error) 308 goto bad; 309 } 310 /* Ensure names are null-terminated strings. */ 311 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 312 error = EINVAL; 313 goto bad; 314 } 315 if (optlen != 0) { 316 opt->len = optlen; 317 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 318 if (auio->uio_segflg == UIO_SYSSPACE) { 319 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 320 optlen); 321 } else { 322 error = copyin(auio->uio_iov[i + 1].iov_base, 323 opt->value, optlen); 324 if (error) 325 goto bad; 326 } 327 } 328 } 329 vfs_sanitizeopts(opts); 330 *options = opts; 331 return (0); 332 bad: 333 vfs_freeopts(opts); 334 return (error); 335 } 336 337 /* 338 * Merge the old mount options with the new ones passed 339 * in the MNT_UPDATE case. 340 * 341 * XXX: This function will keep a "nofoo" option in the new 342 * options. E.g, if the option's canonical name is "foo", 343 * "nofoo" ends up in the mount point's active options. 344 */ 345 static void 346 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 347 { 348 struct vfsopt *opt, *new; 349 350 TAILQ_FOREACH(opt, oldopts, link) { 351 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 352 new->name = strdup(opt->name, M_MOUNT); 353 if (opt->len != 0) { 354 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 355 bcopy(opt->value, new->value, opt->len); 356 } else 357 new->value = NULL; 358 new->len = opt->len; 359 new->seen = opt->seen; 360 TAILQ_INSERT_HEAD(toopts, new, link); 361 } 362 vfs_sanitizeopts(toopts); 363 } 364 365 /* 366 * Mount a filesystem. 367 */ 368 int 369 sys_nmount(td, uap) 370 struct thread *td; 371 struct nmount_args /* { 372 struct iovec *iovp; 373 unsigned int iovcnt; 374 int flags; 375 } */ *uap; 376 { 377 struct uio *auio; 378 int error; 379 u_int iovcnt; 380 uint64_t flags; 381 382 /* 383 * Mount flags are now 64-bits. On 32-bit archtectures only 384 * 32-bits are passed in, but from here on everything handles 385 * 64-bit flags correctly. 386 */ 387 flags = uap->flags; 388 389 AUDIT_ARG_FFLAGS(flags); 390 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 391 uap->iovp, uap->iovcnt, flags); 392 393 /* 394 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 395 * userspace to set this flag, but we must filter it out if we want 396 * MNT_UPDATE on the root file system to work. 397 * MNT_ROOTFS should only be set by the kernel when mounting its 398 * root file system. 399 */ 400 flags &= ~MNT_ROOTFS; 401 402 iovcnt = uap->iovcnt; 403 /* 404 * Check that we have an even number of iovec's 405 * and that we have at least two options. 406 */ 407 if ((iovcnt & 1) || (iovcnt < 4)) { 408 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 409 uap->iovcnt); 410 return (EINVAL); 411 } 412 413 error = copyinuio(uap->iovp, iovcnt, &auio); 414 if (error) { 415 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 416 __func__, error); 417 return (error); 418 } 419 error = vfs_donmount(td, flags, auio); 420 421 free(auio, M_IOV); 422 return (error); 423 } 424 425 /* 426 * --------------------------------------------------------------------- 427 * Various utility functions 428 */ 429 430 void 431 vfs_ref(struct mount *mp) 432 { 433 434 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 435 MNT_ILOCK(mp); 436 MNT_REF(mp); 437 MNT_IUNLOCK(mp); 438 } 439 440 void 441 vfs_rel(struct mount *mp) 442 { 443 444 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 445 MNT_ILOCK(mp); 446 MNT_REL(mp); 447 MNT_IUNLOCK(mp); 448 } 449 450 /* 451 * Allocate and initialize the mount point struct. 452 */ 453 struct mount * 454 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 455 struct ucred *cred) 456 { 457 struct mount *mp; 458 459 mp = uma_zalloc(mount_zone, M_WAITOK); 460 bzero(&mp->mnt_startzero, 461 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 462 TAILQ_INIT(&mp->mnt_nvnodelist); 463 mp->mnt_nvnodelistsize = 0; 464 TAILQ_INIT(&mp->mnt_activevnodelist); 465 mp->mnt_activevnodelistsize = 0; 466 TAILQ_INIT(&mp->mnt_tmpfreevnodelist); 467 mp->mnt_tmpfreevnodelistsize = 0; 468 mp->mnt_ref = 0; 469 (void) vfs_busy(mp, MBF_NOWAIT); 470 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 471 mp->mnt_op = vfsp->vfc_vfsops; 472 mp->mnt_vfc = vfsp; 473 mp->mnt_stat.f_type = vfsp->vfc_typenum; 474 mp->mnt_gen++; 475 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 476 mp->mnt_vnodecovered = vp; 477 mp->mnt_cred = crdup(cred); 478 mp->mnt_stat.f_owner = cred->cr_uid; 479 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 480 mp->mnt_iosize_max = DFLTPHYS; 481 #ifdef MAC 482 mac_mount_init(mp); 483 mac_mount_create(cred, mp); 484 #endif 485 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 486 TAILQ_INIT(&mp->mnt_uppers); 487 return (mp); 488 } 489 490 /* 491 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 492 */ 493 void 494 vfs_mount_destroy(struct mount *mp) 495 { 496 497 MNT_ILOCK(mp); 498 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 499 if (mp->mnt_kern_flag & MNTK_MWAIT) { 500 mp->mnt_kern_flag &= ~MNTK_MWAIT; 501 wakeup(mp); 502 } 503 while (mp->mnt_ref) 504 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 505 KASSERT(mp->mnt_ref == 0, 506 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 507 __FILE__, __LINE__)); 508 if (mp->mnt_writeopcount != 0) 509 panic("vfs_mount_destroy: nonzero writeopcount"); 510 if (mp->mnt_secondary_writes != 0) 511 panic("vfs_mount_destroy: nonzero secondary_writes"); 512 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 513 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 514 struct vnode *vp; 515 516 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 517 vn_printf(vp, "dangling vnode "); 518 panic("unmount: dangling vnode"); 519 } 520 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 521 if (mp->mnt_nvnodelistsize != 0) 522 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 523 if (mp->mnt_activevnodelistsize != 0) 524 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 525 if (mp->mnt_tmpfreevnodelistsize != 0) 526 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize"); 527 if (mp->mnt_lockref != 0) 528 panic("vfs_mount_destroy: nonzero lock refcount"); 529 MNT_IUNLOCK(mp); 530 #ifdef MAC 531 mac_mount_destroy(mp); 532 #endif 533 if (mp->mnt_opt != NULL) 534 vfs_freeopts(mp->mnt_opt); 535 crfree(mp->mnt_cred); 536 uma_zfree(mount_zone, mp); 537 } 538 539 int 540 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 541 { 542 struct vfsoptlist *optlist; 543 struct vfsopt *opt, *tmp_opt; 544 char *fstype, *fspath, *errmsg; 545 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 546 547 errmsg = fspath = NULL; 548 errmsg_len = fspathlen = 0; 549 errmsg_pos = -1; 550 551 error = vfs_buildopts(fsoptions, &optlist); 552 if (error) 553 return (error); 554 555 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 556 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 557 558 /* 559 * We need these two options before the others, 560 * and they are mandatory for any filesystem. 561 * Ensure they are NUL terminated as well. 562 */ 563 fstypelen = 0; 564 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 565 if (error || fstype[fstypelen - 1] != '\0') { 566 error = EINVAL; 567 if (errmsg != NULL) 568 strncpy(errmsg, "Invalid fstype", errmsg_len); 569 goto bail; 570 } 571 fspathlen = 0; 572 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 573 if (error || fspath[fspathlen - 1] != '\0') { 574 error = EINVAL; 575 if (errmsg != NULL) 576 strncpy(errmsg, "Invalid fspath", errmsg_len); 577 goto bail; 578 } 579 580 /* 581 * We need to see if we have the "update" option 582 * before we call vfs_domount(), since vfs_domount() has special 583 * logic based on MNT_UPDATE. This is very important 584 * when we want to update the root filesystem. 585 */ 586 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 587 if (strcmp(opt->name, "update") == 0) { 588 fsflags |= MNT_UPDATE; 589 vfs_freeopt(optlist, opt); 590 } 591 else if (strcmp(opt->name, "async") == 0) 592 fsflags |= MNT_ASYNC; 593 else if (strcmp(opt->name, "force") == 0) { 594 fsflags |= MNT_FORCE; 595 vfs_freeopt(optlist, opt); 596 } 597 else if (strcmp(opt->name, "reload") == 0) { 598 fsflags |= MNT_RELOAD; 599 vfs_freeopt(optlist, opt); 600 } 601 else if (strcmp(opt->name, "multilabel") == 0) 602 fsflags |= MNT_MULTILABEL; 603 else if (strcmp(opt->name, "noasync") == 0) 604 fsflags &= ~MNT_ASYNC; 605 else if (strcmp(opt->name, "noatime") == 0) 606 fsflags |= MNT_NOATIME; 607 else if (strcmp(opt->name, "atime") == 0) { 608 free(opt->name, M_MOUNT); 609 opt->name = strdup("nonoatime", M_MOUNT); 610 } 611 else if (strcmp(opt->name, "noclusterr") == 0) 612 fsflags |= MNT_NOCLUSTERR; 613 else if (strcmp(opt->name, "clusterr") == 0) { 614 free(opt->name, M_MOUNT); 615 opt->name = strdup("nonoclusterr", M_MOUNT); 616 } 617 else if (strcmp(opt->name, "noclusterw") == 0) 618 fsflags |= MNT_NOCLUSTERW; 619 else if (strcmp(opt->name, "clusterw") == 0) { 620 free(opt->name, M_MOUNT); 621 opt->name = strdup("nonoclusterw", M_MOUNT); 622 } 623 else if (strcmp(opt->name, "noexec") == 0) 624 fsflags |= MNT_NOEXEC; 625 else if (strcmp(opt->name, "exec") == 0) { 626 free(opt->name, M_MOUNT); 627 opt->name = strdup("nonoexec", M_MOUNT); 628 } 629 else if (strcmp(opt->name, "nosuid") == 0) 630 fsflags |= MNT_NOSUID; 631 else if (strcmp(opt->name, "suid") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("nonosuid", M_MOUNT); 634 } 635 else if (strcmp(opt->name, "nosymfollow") == 0) 636 fsflags |= MNT_NOSYMFOLLOW; 637 else if (strcmp(opt->name, "symfollow") == 0) { 638 free(opt->name, M_MOUNT); 639 opt->name = strdup("nonosymfollow", M_MOUNT); 640 } 641 else if (strcmp(opt->name, "noro") == 0) 642 fsflags &= ~MNT_RDONLY; 643 else if (strcmp(opt->name, "rw") == 0) 644 fsflags &= ~MNT_RDONLY; 645 else if (strcmp(opt->name, "ro") == 0) 646 fsflags |= MNT_RDONLY; 647 else if (strcmp(opt->name, "rdonly") == 0) { 648 free(opt->name, M_MOUNT); 649 opt->name = strdup("ro", M_MOUNT); 650 fsflags |= MNT_RDONLY; 651 } 652 else if (strcmp(opt->name, "suiddir") == 0) 653 fsflags |= MNT_SUIDDIR; 654 else if (strcmp(opt->name, "sync") == 0) 655 fsflags |= MNT_SYNCHRONOUS; 656 else if (strcmp(opt->name, "union") == 0) 657 fsflags |= MNT_UNION; 658 else if (strcmp(opt->name, "automounted") == 0) { 659 fsflags |= MNT_AUTOMOUNTED; 660 vfs_freeopt(optlist, opt); 661 } 662 } 663 664 /* 665 * Be ultra-paranoid about making sure the type and fspath 666 * variables will fit in our mp buffers, including the 667 * terminating NUL. 668 */ 669 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 670 error = ENAMETOOLONG; 671 goto bail; 672 } 673 674 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 675 bail: 676 /* copyout the errmsg */ 677 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 678 && errmsg_len > 0 && errmsg != NULL) { 679 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 680 bcopy(errmsg, 681 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 682 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 683 } else { 684 copyout(errmsg, 685 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 686 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 687 } 688 } 689 690 if (optlist != NULL) 691 vfs_freeopts(optlist); 692 return (error); 693 } 694 695 /* 696 * Old mount API. 697 */ 698 #ifndef _SYS_SYSPROTO_H_ 699 struct mount_args { 700 char *type; 701 char *path; 702 int flags; 703 caddr_t data; 704 }; 705 #endif 706 /* ARGSUSED */ 707 int 708 sys_mount(td, uap) 709 struct thread *td; 710 struct mount_args /* { 711 char *type; 712 char *path; 713 int flags; 714 caddr_t data; 715 } */ *uap; 716 { 717 char *fstype; 718 struct vfsconf *vfsp = NULL; 719 struct mntarg *ma = NULL; 720 uint64_t flags; 721 int error; 722 723 /* 724 * Mount flags are now 64-bits. On 32-bit architectures only 725 * 32-bits are passed in, but from here on everything handles 726 * 64-bit flags correctly. 727 */ 728 flags = uap->flags; 729 730 AUDIT_ARG_FFLAGS(flags); 731 732 /* 733 * Filter out MNT_ROOTFS. We do not want clients of mount() in 734 * userspace to set this flag, but we must filter it out if we want 735 * MNT_UPDATE on the root file system to work. 736 * MNT_ROOTFS should only be set by the kernel when mounting its 737 * root file system. 738 */ 739 flags &= ~MNT_ROOTFS; 740 741 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 742 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 743 if (error) { 744 free(fstype, M_TEMP); 745 return (error); 746 } 747 748 AUDIT_ARG_TEXT(fstype); 749 vfsp = vfs_byname_kld(fstype, td, &error); 750 free(fstype, M_TEMP); 751 if (vfsp == NULL) 752 return (ENOENT); 753 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 754 return (EOPNOTSUPP); 755 756 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 757 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 758 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 759 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 760 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 761 762 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 763 return (error); 764 } 765 766 /* 767 * vfs_domount_first(): first file system mount (not update) 768 */ 769 static int 770 vfs_domount_first( 771 struct thread *td, /* Calling thread. */ 772 struct vfsconf *vfsp, /* File system type. */ 773 char *fspath, /* Mount path. */ 774 struct vnode *vp, /* Vnode to be covered. */ 775 uint64_t fsflags, /* Flags common to all filesystems. */ 776 struct vfsoptlist **optlist /* Options local to the filesystem. */ 777 ) 778 { 779 struct vattr va; 780 struct mount *mp; 781 struct vnode *newdp; 782 int error; 783 784 ASSERT_VOP_ELOCKED(vp, __func__); 785 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 786 787 /* 788 * If the user is not root, ensure that they own the directory 789 * onto which we are attempting to mount. 790 */ 791 error = VOP_GETATTR(vp, &va, td->td_ucred); 792 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 793 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 794 if (error == 0) 795 error = vinvalbuf(vp, V_SAVE, 0, 0); 796 if (error == 0 && vp->v_type != VDIR) 797 error = ENOTDIR; 798 if (error == 0) { 799 VI_LOCK(vp); 800 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 801 vp->v_iflag |= VI_MOUNT; 802 else 803 error = EBUSY; 804 VI_UNLOCK(vp); 805 } 806 if (error != 0) { 807 vput(vp); 808 return (error); 809 } 810 VOP_UNLOCK(vp, 0); 811 812 /* Allocate and initialize the filesystem. */ 813 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 814 /* XXXMAC: pass to vfs_mount_alloc? */ 815 mp->mnt_optnew = *optlist; 816 /* Set the mount level flags. */ 817 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 818 819 /* 820 * Mount the filesystem. 821 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 822 * get. No freeing of cn_pnbuf. 823 */ 824 error = VFS_MOUNT(mp); 825 if (error != 0) { 826 vfs_unbusy(mp); 827 vfs_mount_destroy(mp); 828 VI_LOCK(vp); 829 vp->v_iflag &= ~VI_MOUNT; 830 VI_UNLOCK(vp); 831 vrele(vp); 832 return (error); 833 } 834 835 if (mp->mnt_opt != NULL) 836 vfs_freeopts(mp->mnt_opt); 837 mp->mnt_opt = mp->mnt_optnew; 838 *optlist = NULL; 839 (void)VFS_STATFS(mp, &mp->mnt_stat); 840 841 /* 842 * Prevent external consumers of mount options from reading mnt_optnew. 843 */ 844 mp->mnt_optnew = NULL; 845 846 MNT_ILOCK(mp); 847 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 848 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 849 mp->mnt_kern_flag |= MNTK_ASYNC; 850 else 851 mp->mnt_kern_flag &= ~MNTK_ASYNC; 852 MNT_IUNLOCK(mp); 853 854 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 855 cache_purge(vp); 856 VI_LOCK(vp); 857 vp->v_iflag &= ~VI_MOUNT; 858 VI_UNLOCK(vp); 859 vp->v_mountedhere = mp; 860 /* Place the new filesystem at the end of the mount list. */ 861 mtx_lock(&mountlist_mtx); 862 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 863 mtx_unlock(&mountlist_mtx); 864 vfs_event_signal(NULL, VQ_MOUNT, 0); 865 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 866 panic("mount: lost mount"); 867 VOP_UNLOCK(vp, 0); 868 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td); 869 VOP_UNLOCK(newdp, 0); 870 mountcheckdirs(vp, newdp); 871 vrele(newdp); 872 if ((mp->mnt_flag & MNT_RDONLY) == 0) 873 vfs_allocate_syncvnode(mp); 874 vfs_unbusy(mp); 875 return (0); 876 } 877 878 /* 879 * vfs_domount_update(): update of mounted file system 880 */ 881 static int 882 vfs_domount_update( 883 struct thread *td, /* Calling thread. */ 884 struct vnode *vp, /* Mount point vnode. */ 885 uint64_t fsflags, /* Flags common to all filesystems. */ 886 struct vfsoptlist **optlist /* Options local to the filesystem. */ 887 ) 888 { 889 struct export_args export; 890 void *bufp; 891 struct mount *mp; 892 int error, export_error, len; 893 uint64_t flag; 894 895 ASSERT_VOP_ELOCKED(vp, __func__); 896 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 897 mp = vp->v_mount; 898 899 if ((vp->v_vflag & VV_ROOT) == 0) { 900 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 901 == 0) 902 error = EXDEV; 903 else 904 error = EINVAL; 905 vput(vp); 906 return (error); 907 } 908 909 /* 910 * We only allow the filesystem to be reloaded if it 911 * is currently mounted read-only. 912 */ 913 flag = mp->mnt_flag; 914 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 915 vput(vp); 916 return (EOPNOTSUPP); /* Needs translation */ 917 } 918 /* 919 * Only privileged root, or (if MNT_USER is set) the user that 920 * did the original mount is permitted to update it. 921 */ 922 error = vfs_suser(mp, td); 923 if (error != 0) { 924 vput(vp); 925 return (error); 926 } 927 if (vfs_busy(mp, MBF_NOWAIT)) { 928 vput(vp); 929 return (EBUSY); 930 } 931 VI_LOCK(vp); 932 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 933 VI_UNLOCK(vp); 934 vfs_unbusy(mp); 935 vput(vp); 936 return (EBUSY); 937 } 938 vp->v_iflag |= VI_MOUNT; 939 VI_UNLOCK(vp); 940 VOP_UNLOCK(vp, 0); 941 942 MNT_ILOCK(mp); 943 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 944 MNT_IUNLOCK(mp); 945 error = EBUSY; 946 goto end; 947 } 948 mp->mnt_flag &= ~MNT_UPDATEMASK; 949 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 950 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 951 if ((mp->mnt_flag & MNT_ASYNC) == 0) 952 mp->mnt_kern_flag &= ~MNTK_ASYNC; 953 MNT_IUNLOCK(mp); 954 mp->mnt_optnew = *optlist; 955 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 956 957 /* 958 * Mount the filesystem. 959 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 960 * get. No freeing of cn_pnbuf. 961 */ 962 error = VFS_MOUNT(mp); 963 964 export_error = 0; 965 /* Process the export option. */ 966 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 967 &len) == 0) { 968 /* Assume that there is only 1 ABI for each length. */ 969 switch (len) { 970 case (sizeof(struct oexport_args)): 971 bzero(&export, sizeof(export)); 972 /* FALLTHROUGH */ 973 case (sizeof(export)): 974 bcopy(bufp, &export, len); 975 export_error = vfs_export(mp, &export); 976 break; 977 default: 978 export_error = EINVAL; 979 break; 980 } 981 } 982 983 MNT_ILOCK(mp); 984 if (error == 0) { 985 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 986 MNT_SNAPSHOT); 987 } else { 988 /* 989 * If we fail, restore old mount flags. MNT_QUOTA is special, 990 * because it is not part of MNT_UPDATEMASK, but it could have 991 * changed in the meantime if quotactl(2) was called. 992 * All in all we want current value of MNT_QUOTA, not the old 993 * one. 994 */ 995 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 996 } 997 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 998 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 999 mp->mnt_kern_flag |= MNTK_ASYNC; 1000 else 1001 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1002 MNT_IUNLOCK(mp); 1003 1004 if (error != 0) 1005 goto end; 1006 1007 if (mp->mnt_opt != NULL) 1008 vfs_freeopts(mp->mnt_opt); 1009 mp->mnt_opt = mp->mnt_optnew; 1010 *optlist = NULL; 1011 (void)VFS_STATFS(mp, &mp->mnt_stat); 1012 /* 1013 * Prevent external consumers of mount options from reading 1014 * mnt_optnew. 1015 */ 1016 mp->mnt_optnew = NULL; 1017 1018 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1019 vfs_allocate_syncvnode(mp); 1020 else 1021 vfs_deallocate_syncvnode(mp); 1022 end: 1023 vfs_unbusy(mp); 1024 VI_LOCK(vp); 1025 vp->v_iflag &= ~VI_MOUNT; 1026 VI_UNLOCK(vp); 1027 vrele(vp); 1028 return (error != 0 ? error : export_error); 1029 } 1030 1031 /* 1032 * vfs_domount(): actually attempt a filesystem mount. 1033 */ 1034 static int 1035 vfs_domount( 1036 struct thread *td, /* Calling thread. */ 1037 const char *fstype, /* Filesystem type. */ 1038 char *fspath, /* Mount path. */ 1039 uint64_t fsflags, /* Flags common to all filesystems. */ 1040 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1041 ) 1042 { 1043 struct vfsconf *vfsp; 1044 struct nameidata nd; 1045 struct vnode *vp; 1046 char *pathbuf; 1047 int error; 1048 1049 /* 1050 * Be ultra-paranoid about making sure the type and fspath 1051 * variables will fit in our mp buffers, including the 1052 * terminating NUL. 1053 */ 1054 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1055 return (ENAMETOOLONG); 1056 1057 if (jailed(td->td_ucred) || usermount == 0) { 1058 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1059 return (error); 1060 } 1061 1062 /* 1063 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1064 */ 1065 if (fsflags & MNT_EXPORTED) { 1066 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1067 if (error) 1068 return (error); 1069 } 1070 if (fsflags & MNT_SUIDDIR) { 1071 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1072 if (error) 1073 return (error); 1074 } 1075 /* 1076 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1077 */ 1078 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1079 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1080 fsflags |= MNT_NOSUID | MNT_USER; 1081 } 1082 1083 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1084 vfsp = NULL; 1085 if ((fsflags & MNT_UPDATE) == 0) { 1086 /* Don't try to load KLDs if we're mounting the root. */ 1087 if (fsflags & MNT_ROOTFS) 1088 vfsp = vfs_byname(fstype); 1089 else 1090 vfsp = vfs_byname_kld(fstype, td, &error); 1091 if (vfsp == NULL) 1092 return (ENODEV); 1093 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1094 return (EPERM); 1095 } 1096 1097 /* 1098 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1099 */ 1100 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1101 UIO_SYSSPACE, fspath, td); 1102 error = namei(&nd); 1103 if (error != 0) 1104 return (error); 1105 NDFREE(&nd, NDF_ONLY_PNBUF); 1106 vp = nd.ni_vp; 1107 if ((fsflags & MNT_UPDATE) == 0) { 1108 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1109 strcpy(pathbuf, fspath); 1110 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1111 /* debug.disablefullpath == 1 results in ENODEV */ 1112 if (error == 0 || error == ENODEV) { 1113 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1114 fsflags, optlist); 1115 } 1116 free(pathbuf, M_TEMP); 1117 } else 1118 error = vfs_domount_update(td, vp, fsflags, optlist); 1119 1120 return (error); 1121 } 1122 1123 /* 1124 * Unmount a filesystem. 1125 * 1126 * Note: unmount takes a path to the vnode mounted on as argument, not 1127 * special file (as before). 1128 */ 1129 #ifndef _SYS_SYSPROTO_H_ 1130 struct unmount_args { 1131 char *path; 1132 int flags; 1133 }; 1134 #endif 1135 /* ARGSUSED */ 1136 int 1137 sys_unmount(struct thread *td, struct unmount_args *uap) 1138 { 1139 struct nameidata nd; 1140 struct mount *mp; 1141 char *pathbuf; 1142 int error, id0, id1; 1143 1144 AUDIT_ARG_VALUE(uap->flags); 1145 if (jailed(td->td_ucred) || usermount == 0) { 1146 error = priv_check(td, PRIV_VFS_UNMOUNT); 1147 if (error) 1148 return (error); 1149 } 1150 1151 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1152 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1153 if (error) { 1154 free(pathbuf, M_TEMP); 1155 return (error); 1156 } 1157 if (uap->flags & MNT_BYFSID) { 1158 AUDIT_ARG_TEXT(pathbuf); 1159 /* Decode the filesystem ID. */ 1160 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1161 free(pathbuf, M_TEMP); 1162 return (EINVAL); 1163 } 1164 1165 mtx_lock(&mountlist_mtx); 1166 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1167 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1168 mp->mnt_stat.f_fsid.val[1] == id1) { 1169 vfs_ref(mp); 1170 break; 1171 } 1172 } 1173 mtx_unlock(&mountlist_mtx); 1174 } else { 1175 /* 1176 * Try to find global path for path argument. 1177 */ 1178 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1179 UIO_SYSSPACE, pathbuf, td); 1180 if (namei(&nd) == 0) { 1181 NDFREE(&nd, NDF_ONLY_PNBUF); 1182 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1183 MNAMELEN); 1184 if (error == 0 || error == ENODEV) 1185 vput(nd.ni_vp); 1186 } 1187 mtx_lock(&mountlist_mtx); 1188 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1189 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1190 vfs_ref(mp); 1191 break; 1192 } 1193 } 1194 mtx_unlock(&mountlist_mtx); 1195 } 1196 free(pathbuf, M_TEMP); 1197 if (mp == NULL) { 1198 /* 1199 * Previously we returned ENOENT for a nonexistent path and 1200 * EINVAL for a non-mountpoint. We cannot tell these apart 1201 * now, so in the !MNT_BYFSID case return the more likely 1202 * EINVAL for compatibility. 1203 */ 1204 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1205 } 1206 1207 /* 1208 * Don't allow unmounting the root filesystem. 1209 */ 1210 if (mp->mnt_flag & MNT_ROOTFS) { 1211 vfs_rel(mp); 1212 return (EINVAL); 1213 } 1214 error = dounmount(mp, uap->flags, td); 1215 return (error); 1216 } 1217 1218 /* 1219 * Return error if any of the vnodes, ignoring the root vnode 1220 * and the syncer vnode, have non-zero usecount. 1221 * 1222 * This function is purely advisory - it can return false positives 1223 * and negatives. 1224 */ 1225 static int 1226 vfs_check_usecounts(struct mount *mp) 1227 { 1228 struct vnode *vp, *mvp; 1229 1230 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1231 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1232 vp->v_usecount != 0) { 1233 VI_UNLOCK(vp); 1234 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1235 return (EBUSY); 1236 } 1237 VI_UNLOCK(vp); 1238 } 1239 1240 return (0); 1241 } 1242 1243 static void 1244 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags) 1245 { 1246 1247 mtx_assert(MNT_MTX(mp), MA_OWNED); 1248 mp->mnt_kern_flag &= ~mntkflags; 1249 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) { 1250 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1251 wakeup(mp); 1252 } 1253 MNT_IUNLOCK(mp); 1254 if (coveredvp != NULL) { 1255 VOP_UNLOCK(coveredvp, 0); 1256 vdrop(coveredvp); 1257 } 1258 vn_finished_write(mp); 1259 } 1260 1261 /* 1262 * Do the actual filesystem unmount. 1263 */ 1264 int 1265 dounmount(struct mount *mp, int flags, struct thread *td) 1266 { 1267 struct vnode *coveredvp, *fsrootvp; 1268 int error; 1269 uint64_t async_flag; 1270 int mnt_gen_r; 1271 1272 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1273 mnt_gen_r = mp->mnt_gen; 1274 VI_LOCK(coveredvp); 1275 vholdl(coveredvp); 1276 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1277 /* 1278 * Check for mp being unmounted while waiting for the 1279 * covered vnode lock. 1280 */ 1281 if (coveredvp->v_mountedhere != mp || 1282 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1283 VOP_UNLOCK(coveredvp, 0); 1284 vdrop(coveredvp); 1285 vfs_rel(mp); 1286 return (EBUSY); 1287 } 1288 } 1289 1290 /* 1291 * Only privileged root, or (if MNT_USER is set) the user that did the 1292 * original mount is permitted to unmount this filesystem. 1293 */ 1294 error = vfs_suser(mp, td); 1295 if (error != 0) { 1296 if (coveredvp != NULL) { 1297 VOP_UNLOCK(coveredvp, 0); 1298 vdrop(coveredvp); 1299 } 1300 vfs_rel(mp); 1301 return (error); 1302 } 1303 1304 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1305 MNT_ILOCK(mp); 1306 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1307 (mp->mnt_flag & MNT_UPDATE) != 0 || 1308 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1309 dounmount_cleanup(mp, coveredvp, 0); 1310 return (EBUSY); 1311 } 1312 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1313 if (flags & MNT_NONBUSY) { 1314 MNT_IUNLOCK(mp); 1315 error = vfs_check_usecounts(mp); 1316 MNT_ILOCK(mp); 1317 if (error != 0) { 1318 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT | 1319 MNTK_NOINSMNTQ); 1320 return (error); 1321 } 1322 } 1323 /* Allow filesystems to detect that a forced unmount is in progress. */ 1324 if (flags & MNT_FORCE) { 1325 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1326 MNT_IUNLOCK(mp); 1327 /* 1328 * Must be done after setting MNTK_UNMOUNTF and before 1329 * waiting for mnt_lockref to become 0. 1330 */ 1331 VFS_PURGE(mp); 1332 MNT_ILOCK(mp); 1333 } 1334 error = 0; 1335 if (mp->mnt_lockref) { 1336 mp->mnt_kern_flag |= MNTK_DRAINING; 1337 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1338 "mount drain", 0); 1339 } 1340 MNT_IUNLOCK(mp); 1341 KASSERT(mp->mnt_lockref == 0, 1342 ("%s: invalid lock refcount in the drain path @ %s:%d", 1343 __func__, __FILE__, __LINE__)); 1344 KASSERT(error == 0, 1345 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1346 __func__, __FILE__, __LINE__)); 1347 1348 if (mp->mnt_flag & MNT_EXPUBLIC) 1349 vfs_setpublicfs(NULL, NULL, NULL); 1350 1351 /* 1352 * From now, we can claim that the use reference on the 1353 * coveredvp is ours, and the ref can be released only by 1354 * successfull unmount by us, or left for later unmount 1355 * attempt. The previously acquired hold reference is no 1356 * longer needed to protect the vnode from reuse. 1357 */ 1358 if (coveredvp != NULL) 1359 vdrop(coveredvp); 1360 1361 vfs_msync(mp, MNT_WAIT); 1362 MNT_ILOCK(mp); 1363 async_flag = mp->mnt_flag & MNT_ASYNC; 1364 mp->mnt_flag &= ~MNT_ASYNC; 1365 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1366 MNT_IUNLOCK(mp); 1367 cache_purgevfs(mp, false); /* remove cache entries for this file sys */ 1368 vfs_deallocate_syncvnode(mp); 1369 /* 1370 * For forced unmounts, move process cdir/rdir refs on the fs root 1371 * vnode to the covered vnode. For non-forced unmounts we want 1372 * such references to cause an EBUSY error. 1373 */ 1374 if ((flags & MNT_FORCE) && 1375 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1376 if (mp->mnt_vnodecovered != NULL && 1377 (mp->mnt_flag & MNT_IGNORE) == 0) 1378 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1379 if (fsrootvp == rootvnode) { 1380 vrele(rootvnode); 1381 rootvnode = NULL; 1382 } 1383 vput(fsrootvp); 1384 } 1385 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1386 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1387 error = VFS_UNMOUNT(mp, flags); 1388 vn_finished_write(mp); 1389 /* 1390 * If we failed to flush the dirty blocks for this mount point, 1391 * undo all the cdir/rdir and rootvnode changes we made above. 1392 * Unless we failed to do so because the device is reporting that 1393 * it doesn't exist anymore. 1394 */ 1395 if (error && error != ENXIO) { 1396 if ((flags & MNT_FORCE) && 1397 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1398 if (mp->mnt_vnodecovered != NULL && 1399 (mp->mnt_flag & MNT_IGNORE) == 0) 1400 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1401 if (rootvnode == NULL) { 1402 rootvnode = fsrootvp; 1403 vref(rootvnode); 1404 } 1405 vput(fsrootvp); 1406 } 1407 MNT_ILOCK(mp); 1408 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1409 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1410 MNT_IUNLOCK(mp); 1411 vfs_allocate_syncvnode(mp); 1412 MNT_ILOCK(mp); 1413 } 1414 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1415 mp->mnt_flag |= async_flag; 1416 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1417 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1418 mp->mnt_kern_flag |= MNTK_ASYNC; 1419 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1420 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1421 wakeup(mp); 1422 } 1423 MNT_IUNLOCK(mp); 1424 if (coveredvp) 1425 VOP_UNLOCK(coveredvp, 0); 1426 return (error); 1427 } 1428 mtx_lock(&mountlist_mtx); 1429 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1430 mtx_unlock(&mountlist_mtx); 1431 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td); 1432 if (coveredvp != NULL) { 1433 coveredvp->v_mountedhere = NULL; 1434 vput(coveredvp); 1435 } 1436 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1437 if (mp == rootdevmp) 1438 rootdevmp = NULL; 1439 vfs_mount_destroy(mp); 1440 return (0); 1441 } 1442 1443 /* 1444 * Report errors during filesystem mounting. 1445 */ 1446 void 1447 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1448 { 1449 struct vfsoptlist *moptlist = mp->mnt_optnew; 1450 va_list ap; 1451 int error, len; 1452 char *errmsg; 1453 1454 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1455 if (error || errmsg == NULL || len <= 0) 1456 return; 1457 1458 va_start(ap, fmt); 1459 vsnprintf(errmsg, (size_t)len, fmt, ap); 1460 va_end(ap); 1461 } 1462 1463 void 1464 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1465 { 1466 va_list ap; 1467 int error, len; 1468 char *errmsg; 1469 1470 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1471 if (error || errmsg == NULL || len <= 0) 1472 return; 1473 1474 va_start(ap, fmt); 1475 vsnprintf(errmsg, (size_t)len, fmt, ap); 1476 va_end(ap); 1477 } 1478 1479 /* 1480 * --------------------------------------------------------------------- 1481 * Functions for querying mount options/arguments from filesystems. 1482 */ 1483 1484 /* 1485 * Check that no unknown options are given 1486 */ 1487 int 1488 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1489 { 1490 struct vfsopt *opt; 1491 char errmsg[255]; 1492 const char **t, *p, *q; 1493 int ret = 0; 1494 1495 TAILQ_FOREACH(opt, opts, link) { 1496 p = opt->name; 1497 q = NULL; 1498 if (p[0] == 'n' && p[1] == 'o') 1499 q = p + 2; 1500 for(t = global_opts; *t != NULL; t++) { 1501 if (strcmp(*t, p) == 0) 1502 break; 1503 if (q != NULL) { 1504 if (strcmp(*t, q) == 0) 1505 break; 1506 } 1507 } 1508 if (*t != NULL) 1509 continue; 1510 for(t = legal; *t != NULL; t++) { 1511 if (strcmp(*t, p) == 0) 1512 break; 1513 if (q != NULL) { 1514 if (strcmp(*t, q) == 0) 1515 break; 1516 } 1517 } 1518 if (*t != NULL) 1519 continue; 1520 snprintf(errmsg, sizeof(errmsg), 1521 "mount option <%s> is unknown", p); 1522 ret = EINVAL; 1523 } 1524 if (ret != 0) { 1525 TAILQ_FOREACH(opt, opts, link) { 1526 if (strcmp(opt->name, "errmsg") == 0) { 1527 strncpy((char *)opt->value, errmsg, opt->len); 1528 break; 1529 } 1530 } 1531 if (opt == NULL) 1532 printf("%s\n", errmsg); 1533 } 1534 return (ret); 1535 } 1536 1537 /* 1538 * Get a mount option by its name. 1539 * 1540 * Return 0 if the option was found, ENOENT otherwise. 1541 * If len is non-NULL it will be filled with the length 1542 * of the option. If buf is non-NULL, it will be filled 1543 * with the address of the option. 1544 */ 1545 int 1546 vfs_getopt(opts, name, buf, len) 1547 struct vfsoptlist *opts; 1548 const char *name; 1549 void **buf; 1550 int *len; 1551 { 1552 struct vfsopt *opt; 1553 1554 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1555 1556 TAILQ_FOREACH(opt, opts, link) { 1557 if (strcmp(name, opt->name) == 0) { 1558 opt->seen = 1; 1559 if (len != NULL) 1560 *len = opt->len; 1561 if (buf != NULL) 1562 *buf = opt->value; 1563 return (0); 1564 } 1565 } 1566 return (ENOENT); 1567 } 1568 1569 int 1570 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1571 { 1572 struct vfsopt *opt; 1573 1574 if (opts == NULL) 1575 return (-1); 1576 1577 TAILQ_FOREACH(opt, opts, link) { 1578 if (strcmp(name, opt->name) == 0) { 1579 opt->seen = 1; 1580 return (opt->pos); 1581 } 1582 } 1583 return (-1); 1584 } 1585 1586 int 1587 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1588 { 1589 char *opt_value, *vtp; 1590 quad_t iv; 1591 int error, opt_len; 1592 1593 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1594 if (error != 0) 1595 return (error); 1596 if (opt_len == 0 || opt_value == NULL) 1597 return (EINVAL); 1598 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1599 return (EINVAL); 1600 iv = strtoq(opt_value, &vtp, 0); 1601 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1602 return (EINVAL); 1603 if (iv < 0) 1604 return (EINVAL); 1605 switch (vtp[0]) { 1606 case 't': 1607 case 'T': 1608 iv *= 1024; 1609 case 'g': 1610 case 'G': 1611 iv *= 1024; 1612 case 'm': 1613 case 'M': 1614 iv *= 1024; 1615 case 'k': 1616 case 'K': 1617 iv *= 1024; 1618 case '\0': 1619 break; 1620 default: 1621 return (EINVAL); 1622 } 1623 *value = iv; 1624 1625 return (0); 1626 } 1627 1628 char * 1629 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1630 { 1631 struct vfsopt *opt; 1632 1633 *error = 0; 1634 TAILQ_FOREACH(opt, opts, link) { 1635 if (strcmp(name, opt->name) != 0) 1636 continue; 1637 opt->seen = 1; 1638 if (opt->len == 0 || 1639 ((char *)opt->value)[opt->len - 1] != '\0') { 1640 *error = EINVAL; 1641 return (NULL); 1642 } 1643 return (opt->value); 1644 } 1645 *error = ENOENT; 1646 return (NULL); 1647 } 1648 1649 int 1650 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1651 uint64_t val) 1652 { 1653 struct vfsopt *opt; 1654 1655 TAILQ_FOREACH(opt, opts, link) { 1656 if (strcmp(name, opt->name) == 0) { 1657 opt->seen = 1; 1658 if (w != NULL) 1659 *w |= val; 1660 return (1); 1661 } 1662 } 1663 if (w != NULL) 1664 *w &= ~val; 1665 return (0); 1666 } 1667 1668 int 1669 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1670 { 1671 va_list ap; 1672 struct vfsopt *opt; 1673 int ret; 1674 1675 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1676 1677 TAILQ_FOREACH(opt, opts, link) { 1678 if (strcmp(name, opt->name) != 0) 1679 continue; 1680 opt->seen = 1; 1681 if (opt->len == 0 || opt->value == NULL) 1682 return (0); 1683 if (((char *)opt->value)[opt->len - 1] != '\0') 1684 return (0); 1685 va_start(ap, fmt); 1686 ret = vsscanf(opt->value, fmt, ap); 1687 va_end(ap); 1688 return (ret); 1689 } 1690 return (0); 1691 } 1692 1693 int 1694 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1695 { 1696 struct vfsopt *opt; 1697 1698 TAILQ_FOREACH(opt, opts, link) { 1699 if (strcmp(name, opt->name) != 0) 1700 continue; 1701 opt->seen = 1; 1702 if (opt->value == NULL) 1703 opt->len = len; 1704 else { 1705 if (opt->len != len) 1706 return (EINVAL); 1707 bcopy(value, opt->value, len); 1708 } 1709 return (0); 1710 } 1711 return (ENOENT); 1712 } 1713 1714 int 1715 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1716 { 1717 struct vfsopt *opt; 1718 1719 TAILQ_FOREACH(opt, opts, link) { 1720 if (strcmp(name, opt->name) != 0) 1721 continue; 1722 opt->seen = 1; 1723 if (opt->value == NULL) 1724 opt->len = len; 1725 else { 1726 if (opt->len < len) 1727 return (EINVAL); 1728 opt->len = len; 1729 bcopy(value, opt->value, len); 1730 } 1731 return (0); 1732 } 1733 return (ENOENT); 1734 } 1735 1736 int 1737 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1738 { 1739 struct vfsopt *opt; 1740 1741 TAILQ_FOREACH(opt, opts, link) { 1742 if (strcmp(name, opt->name) != 0) 1743 continue; 1744 opt->seen = 1; 1745 if (opt->value == NULL) 1746 opt->len = strlen(value) + 1; 1747 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1748 return (EINVAL); 1749 return (0); 1750 } 1751 return (ENOENT); 1752 } 1753 1754 /* 1755 * Find and copy a mount option. 1756 * 1757 * The size of the buffer has to be specified 1758 * in len, if it is not the same length as the 1759 * mount option, EINVAL is returned. 1760 * Returns ENOENT if the option is not found. 1761 */ 1762 int 1763 vfs_copyopt(opts, name, dest, len) 1764 struct vfsoptlist *opts; 1765 const char *name; 1766 void *dest; 1767 int len; 1768 { 1769 struct vfsopt *opt; 1770 1771 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1772 1773 TAILQ_FOREACH(opt, opts, link) { 1774 if (strcmp(name, opt->name) == 0) { 1775 opt->seen = 1; 1776 if (len != opt->len) 1777 return (EINVAL); 1778 bcopy(opt->value, dest, opt->len); 1779 return (0); 1780 } 1781 } 1782 return (ENOENT); 1783 } 1784 1785 int 1786 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1787 { 1788 int error; 1789 1790 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1791 if (sbp != &mp->mnt_stat) 1792 *sbp = mp->mnt_stat; 1793 return (error); 1794 } 1795 1796 void 1797 vfs_mountedfrom(struct mount *mp, const char *from) 1798 { 1799 1800 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1801 strlcpy(mp->mnt_stat.f_mntfromname, from, 1802 sizeof mp->mnt_stat.f_mntfromname); 1803 } 1804 1805 /* 1806 * --------------------------------------------------------------------- 1807 * This is the api for building mount args and mounting filesystems from 1808 * inside the kernel. 1809 * 1810 * The API works by accumulation of individual args. First error is 1811 * latched. 1812 * 1813 * XXX: should be documented in new manpage kernel_mount(9) 1814 */ 1815 1816 /* A memory allocation which must be freed when we are done */ 1817 struct mntaarg { 1818 SLIST_ENTRY(mntaarg) next; 1819 }; 1820 1821 /* The header for the mount arguments */ 1822 struct mntarg { 1823 struct iovec *v; 1824 int len; 1825 int error; 1826 SLIST_HEAD(, mntaarg) list; 1827 }; 1828 1829 /* 1830 * Add a boolean argument. 1831 * 1832 * flag is the boolean value. 1833 * name must start with "no". 1834 */ 1835 struct mntarg * 1836 mount_argb(struct mntarg *ma, int flag, const char *name) 1837 { 1838 1839 KASSERT(name[0] == 'n' && name[1] == 'o', 1840 ("mount_argb(...,%s): name must start with 'no'", name)); 1841 1842 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1843 } 1844 1845 /* 1846 * Add an argument printf style 1847 */ 1848 struct mntarg * 1849 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1850 { 1851 va_list ap; 1852 struct mntaarg *maa; 1853 struct sbuf *sb; 1854 int len; 1855 1856 if (ma == NULL) { 1857 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1858 SLIST_INIT(&ma->list); 1859 } 1860 if (ma->error) 1861 return (ma); 1862 1863 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1864 M_MOUNT, M_WAITOK); 1865 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1866 ma->v[ma->len].iov_len = strlen(name) + 1; 1867 ma->len++; 1868 1869 sb = sbuf_new_auto(); 1870 va_start(ap, fmt); 1871 sbuf_vprintf(sb, fmt, ap); 1872 va_end(ap); 1873 sbuf_finish(sb); 1874 len = sbuf_len(sb) + 1; 1875 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1876 SLIST_INSERT_HEAD(&ma->list, maa, next); 1877 bcopy(sbuf_data(sb), maa + 1, len); 1878 sbuf_delete(sb); 1879 1880 ma->v[ma->len].iov_base = maa + 1; 1881 ma->v[ma->len].iov_len = len; 1882 ma->len++; 1883 1884 return (ma); 1885 } 1886 1887 /* 1888 * Add an argument which is a userland string. 1889 */ 1890 struct mntarg * 1891 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1892 { 1893 struct mntaarg *maa; 1894 char *tbuf; 1895 1896 if (val == NULL) 1897 return (ma); 1898 if (ma == NULL) { 1899 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1900 SLIST_INIT(&ma->list); 1901 } 1902 if (ma->error) 1903 return (ma); 1904 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1905 SLIST_INSERT_HEAD(&ma->list, maa, next); 1906 tbuf = (void *)(maa + 1); 1907 ma->error = copyinstr(val, tbuf, len, NULL); 1908 return (mount_arg(ma, name, tbuf, -1)); 1909 } 1910 1911 /* 1912 * Plain argument. 1913 * 1914 * If length is -1, treat value as a C string. 1915 */ 1916 struct mntarg * 1917 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1918 { 1919 1920 if (ma == NULL) { 1921 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1922 SLIST_INIT(&ma->list); 1923 } 1924 if (ma->error) 1925 return (ma); 1926 1927 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1928 M_MOUNT, M_WAITOK); 1929 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1930 ma->v[ma->len].iov_len = strlen(name) + 1; 1931 ma->len++; 1932 1933 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1934 if (len < 0) 1935 ma->v[ma->len].iov_len = strlen(val) + 1; 1936 else 1937 ma->v[ma->len].iov_len = len; 1938 ma->len++; 1939 return (ma); 1940 } 1941 1942 /* 1943 * Free a mntarg structure 1944 */ 1945 static void 1946 free_mntarg(struct mntarg *ma) 1947 { 1948 struct mntaarg *maa; 1949 1950 while (!SLIST_EMPTY(&ma->list)) { 1951 maa = SLIST_FIRST(&ma->list); 1952 SLIST_REMOVE_HEAD(&ma->list, next); 1953 free(maa, M_MOUNT); 1954 } 1955 free(ma->v, M_MOUNT); 1956 free(ma, M_MOUNT); 1957 } 1958 1959 /* 1960 * Mount a filesystem 1961 */ 1962 int 1963 kernel_mount(struct mntarg *ma, uint64_t flags) 1964 { 1965 struct uio auio; 1966 int error; 1967 1968 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1969 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1970 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1971 1972 auio.uio_iov = ma->v; 1973 auio.uio_iovcnt = ma->len; 1974 auio.uio_segflg = UIO_SYSSPACE; 1975 1976 error = ma->error; 1977 if (!error) 1978 error = vfs_donmount(curthread, flags, &auio); 1979 free_mntarg(ma); 1980 return (error); 1981 } 1982 1983 /* 1984 * A printflike function to mount a filesystem. 1985 */ 1986 int 1987 kernel_vmount(int flags, ...) 1988 { 1989 struct mntarg *ma = NULL; 1990 va_list ap; 1991 const char *cp; 1992 const void *vp; 1993 int error; 1994 1995 va_start(ap, flags); 1996 for (;;) { 1997 cp = va_arg(ap, const char *); 1998 if (cp == NULL) 1999 break; 2000 vp = va_arg(ap, const void *); 2001 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2002 } 2003 va_end(ap); 2004 2005 error = kernel_mount(ma, flags); 2006 return (error); 2007 } 2008 2009 void 2010 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2011 { 2012 2013 bcopy(oexp, exp, sizeof(*oexp)); 2014 exp->ex_numsecflavors = 0; 2015 } 2016