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 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure"); 83 static uma_zone_t mount_zone; 84 85 /* List of mounted filesystems. */ 86 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 87 88 /* For any iteration/modification of mountlist */ 89 struct mtx mountlist_mtx; 90 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 91 92 /* 93 * Global opts, taken by all filesystems 94 */ 95 static const char *global_opts[] = { 96 "errmsg", 97 "fstype", 98 "fspath", 99 "ro", 100 "rw", 101 "nosuid", 102 "noexec", 103 NULL 104 }; 105 106 static int 107 mount_init(void *mem, int size, int flags) 108 { 109 struct mount *mp; 110 111 mp = (struct mount *)mem; 112 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 113 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF); 114 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 115 return (0); 116 } 117 118 static void 119 mount_fini(void *mem, int size) 120 { 121 struct mount *mp; 122 123 mp = (struct mount *)mem; 124 lockdestroy(&mp->mnt_explock); 125 mtx_destroy(&mp->mnt_listmtx); 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 occurrence 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 TAILQ_INIT(&mp->mnt_activevnodelist); 466 mp->mnt_activevnodelistsize = 0; 467 TAILQ_INIT(&mp->mnt_tmpfreevnodelist); 468 mp->mnt_tmpfreevnodelistsize = 0; 469 mp->mnt_ref = 0; 470 (void) vfs_busy(mp, MBF_NOWAIT); 471 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 472 mp->mnt_op = vfsp->vfc_vfsops; 473 mp->mnt_vfc = vfsp; 474 mp->mnt_stat.f_type = vfsp->vfc_typenum; 475 mp->mnt_gen++; 476 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 477 mp->mnt_vnodecovered = vp; 478 mp->mnt_cred = crdup(cred); 479 mp->mnt_stat.f_owner = cred->cr_uid; 480 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 481 mp->mnt_iosize_max = DFLTPHYS; 482 #ifdef MAC 483 mac_mount_init(mp); 484 mac_mount_create(cred, mp); 485 #endif 486 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 487 TAILQ_INIT(&mp->mnt_uppers); 488 return (mp); 489 } 490 491 /* 492 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 493 */ 494 void 495 vfs_mount_destroy(struct mount *mp) 496 { 497 498 MNT_ILOCK(mp); 499 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 500 if (mp->mnt_kern_flag & MNTK_MWAIT) { 501 mp->mnt_kern_flag &= ~MNTK_MWAIT; 502 wakeup(mp); 503 } 504 while (mp->mnt_ref) 505 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 506 KASSERT(mp->mnt_ref == 0, 507 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 508 __FILE__, __LINE__)); 509 if (mp->mnt_writeopcount != 0) 510 panic("vfs_mount_destroy: nonzero writeopcount"); 511 if (mp->mnt_secondary_writes != 0) 512 panic("vfs_mount_destroy: nonzero secondary_writes"); 513 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 514 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 515 struct vnode *vp; 516 517 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 518 vn_printf(vp, "dangling vnode "); 519 panic("unmount: dangling vnode"); 520 } 521 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 522 if (mp->mnt_nvnodelistsize != 0) 523 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 524 if (mp->mnt_activevnodelistsize != 0) 525 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 526 if (mp->mnt_tmpfreevnodelistsize != 0) 527 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize"); 528 if (mp->mnt_lockref != 0) 529 panic("vfs_mount_destroy: nonzero lock refcount"); 530 MNT_IUNLOCK(mp); 531 #ifdef MAC 532 mac_mount_destroy(mp); 533 #endif 534 if (mp->mnt_opt != NULL) 535 vfs_freeopts(mp->mnt_opt); 536 crfree(mp->mnt_cred); 537 uma_zfree(mount_zone, mp); 538 } 539 540 int 541 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 542 { 543 struct vfsoptlist *optlist; 544 struct vfsopt *opt, *tmp_opt; 545 char *fstype, *fspath, *errmsg; 546 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 547 548 errmsg = fspath = NULL; 549 errmsg_len = fspathlen = 0; 550 errmsg_pos = -1; 551 552 error = vfs_buildopts(fsoptions, &optlist); 553 if (error) 554 return (error); 555 556 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 557 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 558 559 /* 560 * We need these two options before the others, 561 * and they are mandatory for any filesystem. 562 * Ensure they are NUL terminated as well. 563 */ 564 fstypelen = 0; 565 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 566 if (error || fstype[fstypelen - 1] != '\0') { 567 error = EINVAL; 568 if (errmsg != NULL) 569 strncpy(errmsg, "Invalid fstype", errmsg_len); 570 goto bail; 571 } 572 fspathlen = 0; 573 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 574 if (error || fspath[fspathlen - 1] != '\0') { 575 error = EINVAL; 576 if (errmsg != NULL) 577 strncpy(errmsg, "Invalid fspath", errmsg_len); 578 goto bail; 579 } 580 581 /* 582 * We need to see if we have the "update" option 583 * before we call vfs_domount(), since vfs_domount() has special 584 * logic based on MNT_UPDATE. This is very important 585 * when we want to update the root filesystem. 586 */ 587 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 588 if (strcmp(opt->name, "update") == 0) { 589 fsflags |= MNT_UPDATE; 590 vfs_freeopt(optlist, opt); 591 } 592 else if (strcmp(opt->name, "async") == 0) 593 fsflags |= MNT_ASYNC; 594 else if (strcmp(opt->name, "force") == 0) { 595 fsflags |= MNT_FORCE; 596 vfs_freeopt(optlist, opt); 597 } 598 else if (strcmp(opt->name, "reload") == 0) { 599 fsflags |= MNT_RELOAD; 600 vfs_freeopt(optlist, opt); 601 } 602 else if (strcmp(opt->name, "multilabel") == 0) 603 fsflags |= MNT_MULTILABEL; 604 else if (strcmp(opt->name, "noasync") == 0) 605 fsflags &= ~MNT_ASYNC; 606 else if (strcmp(opt->name, "noatime") == 0) 607 fsflags |= MNT_NOATIME; 608 else if (strcmp(opt->name, "atime") == 0) { 609 free(opt->name, M_MOUNT); 610 opt->name = strdup("nonoatime", M_MOUNT); 611 } 612 else if (strcmp(opt->name, "noclusterr") == 0) 613 fsflags |= MNT_NOCLUSTERR; 614 else if (strcmp(opt->name, "clusterr") == 0) { 615 free(opt->name, M_MOUNT); 616 opt->name = strdup("nonoclusterr", M_MOUNT); 617 } 618 else if (strcmp(opt->name, "noclusterw") == 0) 619 fsflags |= MNT_NOCLUSTERW; 620 else if (strcmp(opt->name, "clusterw") == 0) { 621 free(opt->name, M_MOUNT); 622 opt->name = strdup("nonoclusterw", M_MOUNT); 623 } 624 else if (strcmp(opt->name, "noexec") == 0) 625 fsflags |= MNT_NOEXEC; 626 else if (strcmp(opt->name, "exec") == 0) { 627 free(opt->name, M_MOUNT); 628 opt->name = strdup("nonoexec", M_MOUNT); 629 } 630 else if (strcmp(opt->name, "nosuid") == 0) 631 fsflags |= MNT_NOSUID; 632 else if (strcmp(opt->name, "suid") == 0) { 633 free(opt->name, M_MOUNT); 634 opt->name = strdup("nonosuid", M_MOUNT); 635 } 636 else if (strcmp(opt->name, "nosymfollow") == 0) 637 fsflags |= MNT_NOSYMFOLLOW; 638 else if (strcmp(opt->name, "symfollow") == 0) { 639 free(opt->name, M_MOUNT); 640 opt->name = strdup("nonosymfollow", M_MOUNT); 641 } 642 else if (strcmp(opt->name, "noro") == 0) 643 fsflags &= ~MNT_RDONLY; 644 else if (strcmp(opt->name, "rw") == 0) 645 fsflags &= ~MNT_RDONLY; 646 else if (strcmp(opt->name, "ro") == 0) 647 fsflags |= MNT_RDONLY; 648 else if (strcmp(opt->name, "rdonly") == 0) { 649 free(opt->name, M_MOUNT); 650 opt->name = strdup("ro", M_MOUNT); 651 fsflags |= MNT_RDONLY; 652 } 653 else if (strcmp(opt->name, "suiddir") == 0) 654 fsflags |= MNT_SUIDDIR; 655 else if (strcmp(opt->name, "sync") == 0) 656 fsflags |= MNT_SYNCHRONOUS; 657 else if (strcmp(opt->name, "union") == 0) 658 fsflags |= MNT_UNION; 659 else if (strcmp(opt->name, "automounted") == 0) { 660 fsflags |= MNT_AUTOMOUNTED; 661 vfs_freeopt(optlist, opt); 662 } 663 } 664 665 /* 666 * Be ultra-paranoid about making sure the type and fspath 667 * variables will fit in our mp buffers, including the 668 * terminating NUL. 669 */ 670 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 671 error = ENAMETOOLONG; 672 goto bail; 673 } 674 675 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 676 bail: 677 /* copyout the errmsg */ 678 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 679 && errmsg_len > 0 && errmsg != NULL) { 680 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 681 bcopy(errmsg, 682 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 683 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 684 } else { 685 copyout(errmsg, 686 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 687 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 688 } 689 } 690 691 if (optlist != NULL) 692 vfs_freeopts(optlist); 693 return (error); 694 } 695 696 /* 697 * Old mount API. 698 */ 699 #ifndef _SYS_SYSPROTO_H_ 700 struct mount_args { 701 char *type; 702 char *path; 703 int flags; 704 caddr_t data; 705 }; 706 #endif 707 /* ARGSUSED */ 708 int 709 sys_mount(td, uap) 710 struct thread *td; 711 struct mount_args /* { 712 char *type; 713 char *path; 714 int flags; 715 caddr_t data; 716 } */ *uap; 717 { 718 char *fstype; 719 struct vfsconf *vfsp = NULL; 720 struct mntarg *ma = NULL; 721 uint64_t flags; 722 int error; 723 724 /* 725 * Mount flags are now 64-bits. On 32-bit architectures only 726 * 32-bits are passed in, but from here on everything handles 727 * 64-bit flags correctly. 728 */ 729 flags = uap->flags; 730 731 AUDIT_ARG_FFLAGS(flags); 732 733 /* 734 * Filter out MNT_ROOTFS. We do not want clients of mount() in 735 * userspace to set this flag, but we must filter it out if we want 736 * MNT_UPDATE on the root file system to work. 737 * MNT_ROOTFS should only be set by the kernel when mounting its 738 * root file system. 739 */ 740 flags &= ~MNT_ROOTFS; 741 742 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 743 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 744 if (error) { 745 free(fstype, M_TEMP); 746 return (error); 747 } 748 749 AUDIT_ARG_TEXT(fstype); 750 vfsp = vfs_byname_kld(fstype, td, &error); 751 free(fstype, M_TEMP); 752 if (vfsp == NULL) 753 return (ENOENT); 754 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 755 return (EOPNOTSUPP); 756 757 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 758 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 759 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 760 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 761 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 762 763 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 764 return (error); 765 } 766 767 /* 768 * vfs_domount_first(): first file system mount (not update) 769 */ 770 static int 771 vfs_domount_first( 772 struct thread *td, /* Calling thread. */ 773 struct vfsconf *vfsp, /* File system type. */ 774 char *fspath, /* Mount path. */ 775 struct vnode *vp, /* Vnode to be covered. */ 776 uint64_t fsflags, /* Flags common to all filesystems. */ 777 struct vfsoptlist **optlist /* Options local to the filesystem. */ 778 ) 779 { 780 struct vattr va; 781 struct mount *mp; 782 struct vnode *newdp; 783 int error; 784 785 ASSERT_VOP_ELOCKED(vp, __func__); 786 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 787 788 /* 789 * If the user is not root, ensure that they own the directory 790 * onto which we are attempting to mount. 791 */ 792 error = VOP_GETATTR(vp, &va, td->td_ucred); 793 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 794 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 795 if (error == 0) 796 error = vinvalbuf(vp, V_SAVE, 0, 0); 797 if (error == 0 && vp->v_type != VDIR) 798 error = ENOTDIR; 799 if (error == 0) { 800 VI_LOCK(vp); 801 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 802 vp->v_iflag |= VI_MOUNT; 803 else 804 error = EBUSY; 805 VI_UNLOCK(vp); 806 } 807 if (error != 0) { 808 vput(vp); 809 return (error); 810 } 811 VOP_UNLOCK(vp, 0); 812 813 /* Allocate and initialize the filesystem. */ 814 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 815 /* XXXMAC: pass to vfs_mount_alloc? */ 816 mp->mnt_optnew = *optlist; 817 /* Set the mount level flags. */ 818 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 819 820 /* 821 * Mount the filesystem. 822 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 823 * get. No freeing of cn_pnbuf. 824 */ 825 error = VFS_MOUNT(mp); 826 if (error != 0) { 827 vfs_unbusy(mp); 828 vfs_mount_destroy(mp); 829 VI_LOCK(vp); 830 vp->v_iflag &= ~VI_MOUNT; 831 VI_UNLOCK(vp); 832 vrele(vp); 833 return (error); 834 } 835 836 if (mp->mnt_opt != NULL) 837 vfs_freeopts(mp->mnt_opt); 838 mp->mnt_opt = mp->mnt_optnew; 839 *optlist = NULL; 840 (void)VFS_STATFS(mp, &mp->mnt_stat); 841 842 /* 843 * Prevent external consumers of mount options from reading mnt_optnew. 844 */ 845 mp->mnt_optnew = NULL; 846 847 MNT_ILOCK(mp); 848 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 849 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 850 mp->mnt_kern_flag |= MNTK_ASYNC; 851 else 852 mp->mnt_kern_flag &= ~MNTK_ASYNC; 853 MNT_IUNLOCK(mp); 854 855 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 856 cache_purge(vp); 857 VI_LOCK(vp); 858 vp->v_iflag &= ~VI_MOUNT; 859 VI_UNLOCK(vp); 860 vp->v_mountedhere = mp; 861 /* Place the new filesystem at the end of the mount list. */ 862 mtx_lock(&mountlist_mtx); 863 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 864 mtx_unlock(&mountlist_mtx); 865 vfs_event_signal(NULL, VQ_MOUNT, 0); 866 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 867 panic("mount: lost mount"); 868 VOP_UNLOCK(vp, 0); 869 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td); 870 VOP_UNLOCK(newdp, 0); 871 mountcheckdirs(vp, newdp); 872 vrele(newdp); 873 if ((mp->mnt_flag & MNT_RDONLY) == 0) 874 vfs_allocate_syncvnode(mp); 875 vfs_unbusy(mp); 876 return (0); 877 } 878 879 /* 880 * vfs_domount_update(): update of mounted file system 881 */ 882 static int 883 vfs_domount_update( 884 struct thread *td, /* Calling thread. */ 885 struct vnode *vp, /* Mount point vnode. */ 886 uint64_t fsflags, /* Flags common to all filesystems. */ 887 struct vfsoptlist **optlist /* Options local to the filesystem. */ 888 ) 889 { 890 struct export_args export; 891 void *bufp; 892 struct mount *mp; 893 int error, export_error, len; 894 uint64_t flag; 895 896 ASSERT_VOP_ELOCKED(vp, __func__); 897 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 898 mp = vp->v_mount; 899 900 if ((vp->v_vflag & VV_ROOT) == 0) { 901 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 902 == 0) 903 error = EXDEV; 904 else 905 error = EINVAL; 906 vput(vp); 907 return (error); 908 } 909 910 /* 911 * We only allow the filesystem to be reloaded if it 912 * is currently mounted read-only. 913 */ 914 flag = mp->mnt_flag; 915 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 916 vput(vp); 917 return (EOPNOTSUPP); /* Needs translation */ 918 } 919 /* 920 * Only privileged root, or (if MNT_USER is set) the user that 921 * did the original mount is permitted to update it. 922 */ 923 error = vfs_suser(mp, td); 924 if (error != 0) { 925 vput(vp); 926 return (error); 927 } 928 if (vfs_busy(mp, MBF_NOWAIT)) { 929 vput(vp); 930 return (EBUSY); 931 } 932 VI_LOCK(vp); 933 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 934 VI_UNLOCK(vp); 935 vfs_unbusy(mp); 936 vput(vp); 937 return (EBUSY); 938 } 939 vp->v_iflag |= VI_MOUNT; 940 VI_UNLOCK(vp); 941 VOP_UNLOCK(vp, 0); 942 943 MNT_ILOCK(mp); 944 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 945 MNT_IUNLOCK(mp); 946 error = EBUSY; 947 goto end; 948 } 949 mp->mnt_flag &= ~MNT_UPDATEMASK; 950 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 951 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 952 if ((mp->mnt_flag & MNT_ASYNC) == 0) 953 mp->mnt_kern_flag &= ~MNTK_ASYNC; 954 MNT_IUNLOCK(mp); 955 mp->mnt_optnew = *optlist; 956 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 957 958 /* 959 * Mount the filesystem. 960 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 961 * get. No freeing of cn_pnbuf. 962 */ 963 error = VFS_MOUNT(mp); 964 965 export_error = 0; 966 /* Process the export option. */ 967 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 968 &len) == 0) { 969 /* Assume that there is only 1 ABI for each length. */ 970 switch (len) { 971 case (sizeof(struct oexport_args)): 972 bzero(&export, sizeof(export)); 973 /* FALLTHROUGH */ 974 case (sizeof(export)): 975 bcopy(bufp, &export, len); 976 export_error = vfs_export(mp, &export); 977 break; 978 default: 979 export_error = EINVAL; 980 break; 981 } 982 } 983 984 MNT_ILOCK(mp); 985 if (error == 0) { 986 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 987 MNT_SNAPSHOT); 988 } else { 989 /* 990 * If we fail, restore old mount flags. MNT_QUOTA is special, 991 * because it is not part of MNT_UPDATEMASK, but it could have 992 * changed in the meantime if quotactl(2) was called. 993 * All in all we want current value of MNT_QUOTA, not the old 994 * one. 995 */ 996 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 997 } 998 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 999 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1000 mp->mnt_kern_flag |= MNTK_ASYNC; 1001 else 1002 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1003 MNT_IUNLOCK(mp); 1004 1005 if (error != 0) 1006 goto end; 1007 1008 if (mp->mnt_opt != NULL) 1009 vfs_freeopts(mp->mnt_opt); 1010 mp->mnt_opt = mp->mnt_optnew; 1011 *optlist = NULL; 1012 (void)VFS_STATFS(mp, &mp->mnt_stat); 1013 /* 1014 * Prevent external consumers of mount options from reading 1015 * mnt_optnew. 1016 */ 1017 mp->mnt_optnew = NULL; 1018 1019 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1020 vfs_allocate_syncvnode(mp); 1021 else 1022 vfs_deallocate_syncvnode(mp); 1023 end: 1024 vfs_unbusy(mp); 1025 VI_LOCK(vp); 1026 vp->v_iflag &= ~VI_MOUNT; 1027 VI_UNLOCK(vp); 1028 vrele(vp); 1029 return (error != 0 ? error : export_error); 1030 } 1031 1032 /* 1033 * vfs_domount(): actually attempt a filesystem mount. 1034 */ 1035 static int 1036 vfs_domount( 1037 struct thread *td, /* Calling thread. */ 1038 const char *fstype, /* Filesystem type. */ 1039 char *fspath, /* Mount path. */ 1040 uint64_t fsflags, /* Flags common to all filesystems. */ 1041 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1042 ) 1043 { 1044 struct vfsconf *vfsp; 1045 struct nameidata nd; 1046 struct vnode *vp; 1047 char *pathbuf; 1048 int error; 1049 1050 /* 1051 * Be ultra-paranoid about making sure the type and fspath 1052 * variables will fit in our mp buffers, including the 1053 * terminating NUL. 1054 */ 1055 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1056 return (ENAMETOOLONG); 1057 1058 if (jailed(td->td_ucred) || usermount == 0) { 1059 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1060 return (error); 1061 } 1062 1063 /* 1064 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1065 */ 1066 if (fsflags & MNT_EXPORTED) { 1067 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1068 if (error) 1069 return (error); 1070 } 1071 if (fsflags & MNT_SUIDDIR) { 1072 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1073 if (error) 1074 return (error); 1075 } 1076 /* 1077 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1078 */ 1079 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1080 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1081 fsflags |= MNT_NOSUID | MNT_USER; 1082 } 1083 1084 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1085 vfsp = NULL; 1086 if ((fsflags & MNT_UPDATE) == 0) { 1087 /* Don't try to load KLDs if we're mounting the root. */ 1088 if (fsflags & MNT_ROOTFS) 1089 vfsp = vfs_byname(fstype); 1090 else 1091 vfsp = vfs_byname_kld(fstype, td, &error); 1092 if (vfsp == NULL) 1093 return (ENODEV); 1094 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1095 return (EPERM); 1096 } 1097 1098 /* 1099 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1100 */ 1101 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1102 UIO_SYSSPACE, fspath, td); 1103 error = namei(&nd); 1104 if (error != 0) 1105 return (error); 1106 NDFREE(&nd, NDF_ONLY_PNBUF); 1107 vp = nd.ni_vp; 1108 if ((fsflags & MNT_UPDATE) == 0) { 1109 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1110 strcpy(pathbuf, fspath); 1111 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1112 /* debug.disablefullpath == 1 results in ENODEV */ 1113 if (error == 0 || error == ENODEV) { 1114 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1115 fsflags, optlist); 1116 } 1117 free(pathbuf, M_TEMP); 1118 } else 1119 error = vfs_domount_update(td, vp, fsflags, optlist); 1120 1121 return (error); 1122 } 1123 1124 /* 1125 * Unmount a filesystem. 1126 * 1127 * Note: unmount takes a path to the vnode mounted on as argument, not 1128 * special file (as before). 1129 */ 1130 #ifndef _SYS_SYSPROTO_H_ 1131 struct unmount_args { 1132 char *path; 1133 int flags; 1134 }; 1135 #endif 1136 /* ARGSUSED */ 1137 int 1138 sys_unmount(struct thread *td, struct unmount_args *uap) 1139 { 1140 struct nameidata nd; 1141 struct mount *mp; 1142 char *pathbuf; 1143 int error, id0, id1; 1144 1145 AUDIT_ARG_VALUE(uap->flags); 1146 if (jailed(td->td_ucred) || usermount == 0) { 1147 error = priv_check(td, PRIV_VFS_UNMOUNT); 1148 if (error) 1149 return (error); 1150 } 1151 1152 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1153 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1154 if (error) { 1155 free(pathbuf, M_TEMP); 1156 return (error); 1157 } 1158 if (uap->flags & MNT_BYFSID) { 1159 AUDIT_ARG_TEXT(pathbuf); 1160 /* Decode the filesystem ID. */ 1161 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1162 free(pathbuf, M_TEMP); 1163 return (EINVAL); 1164 } 1165 1166 mtx_lock(&mountlist_mtx); 1167 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1168 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1169 mp->mnt_stat.f_fsid.val[1] == id1) { 1170 vfs_ref(mp); 1171 break; 1172 } 1173 } 1174 mtx_unlock(&mountlist_mtx); 1175 } else { 1176 /* 1177 * Try to find global path for path argument. 1178 */ 1179 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1180 UIO_SYSSPACE, pathbuf, td); 1181 if (namei(&nd) == 0) { 1182 NDFREE(&nd, NDF_ONLY_PNBUF); 1183 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1184 MNAMELEN); 1185 if (error == 0 || error == ENODEV) 1186 vput(nd.ni_vp); 1187 } 1188 mtx_lock(&mountlist_mtx); 1189 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1190 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1191 vfs_ref(mp); 1192 break; 1193 } 1194 } 1195 mtx_unlock(&mountlist_mtx); 1196 } 1197 free(pathbuf, M_TEMP); 1198 if (mp == NULL) { 1199 /* 1200 * Previously we returned ENOENT for a nonexistent path and 1201 * EINVAL for a non-mountpoint. We cannot tell these apart 1202 * now, so in the !MNT_BYFSID case return the more likely 1203 * EINVAL for compatibility. 1204 */ 1205 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1206 } 1207 1208 /* 1209 * Don't allow unmounting the root filesystem. 1210 */ 1211 if (mp->mnt_flag & MNT_ROOTFS) { 1212 vfs_rel(mp); 1213 return (EINVAL); 1214 } 1215 error = dounmount(mp, uap->flags, td); 1216 return (error); 1217 } 1218 1219 /* 1220 * Return error if any of the vnodes, ignoring the root vnode 1221 * and the syncer vnode, have non-zero usecount. 1222 * 1223 * This function is purely advisory - it can return false positives 1224 * and negatives. 1225 */ 1226 static int 1227 vfs_check_usecounts(struct mount *mp) 1228 { 1229 struct vnode *vp, *mvp; 1230 1231 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1232 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1233 vp->v_usecount != 0) { 1234 VI_UNLOCK(vp); 1235 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1236 return (EBUSY); 1237 } 1238 VI_UNLOCK(vp); 1239 } 1240 1241 return (0); 1242 } 1243 1244 static void 1245 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags) 1246 { 1247 1248 mtx_assert(MNT_MTX(mp), MA_OWNED); 1249 mp->mnt_kern_flag &= ~mntkflags; 1250 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) { 1251 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1252 wakeup(mp); 1253 } 1254 MNT_IUNLOCK(mp); 1255 if (coveredvp != NULL) { 1256 VOP_UNLOCK(coveredvp, 0); 1257 vdrop(coveredvp); 1258 } 1259 vn_finished_write(mp); 1260 } 1261 1262 /* 1263 * Do the actual filesystem unmount. 1264 */ 1265 int 1266 dounmount(struct mount *mp, int flags, struct thread *td) 1267 { 1268 struct vnode *coveredvp, *fsrootvp; 1269 int error; 1270 uint64_t async_flag; 1271 int mnt_gen_r; 1272 1273 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1274 mnt_gen_r = mp->mnt_gen; 1275 VI_LOCK(coveredvp); 1276 vholdl(coveredvp); 1277 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1278 /* 1279 * Check for mp being unmounted while waiting for the 1280 * covered vnode lock. 1281 */ 1282 if (coveredvp->v_mountedhere != mp || 1283 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1284 VOP_UNLOCK(coveredvp, 0); 1285 vdrop(coveredvp); 1286 vfs_rel(mp); 1287 return (EBUSY); 1288 } 1289 } 1290 1291 /* 1292 * Only privileged root, or (if MNT_USER is set) the user that did the 1293 * original mount is permitted to unmount this filesystem. 1294 */ 1295 error = vfs_suser(mp, td); 1296 if (error != 0) { 1297 if (coveredvp != NULL) { 1298 VOP_UNLOCK(coveredvp, 0); 1299 vdrop(coveredvp); 1300 } 1301 vfs_rel(mp); 1302 return (error); 1303 } 1304 1305 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1306 MNT_ILOCK(mp); 1307 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1308 (mp->mnt_flag & MNT_UPDATE) != 0 || 1309 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1310 dounmount_cleanup(mp, coveredvp, 0); 1311 return (EBUSY); 1312 } 1313 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1314 if (flags & MNT_NONBUSY) { 1315 MNT_IUNLOCK(mp); 1316 error = vfs_check_usecounts(mp); 1317 MNT_ILOCK(mp); 1318 if (error != 0) { 1319 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT | 1320 MNTK_NOINSMNTQ); 1321 return (error); 1322 } 1323 } 1324 /* Allow filesystems to detect that a forced unmount is in progress. */ 1325 if (flags & MNT_FORCE) { 1326 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1327 MNT_IUNLOCK(mp); 1328 /* 1329 * Must be done after setting MNTK_UNMOUNTF and before 1330 * waiting for mnt_lockref to become 0. 1331 */ 1332 VFS_PURGE(mp); 1333 MNT_ILOCK(mp); 1334 } 1335 error = 0; 1336 if (mp->mnt_lockref) { 1337 mp->mnt_kern_flag |= MNTK_DRAINING; 1338 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1339 "mount drain", 0); 1340 } 1341 MNT_IUNLOCK(mp); 1342 KASSERT(mp->mnt_lockref == 0, 1343 ("%s: invalid lock refcount in the drain path @ %s:%d", 1344 __func__, __FILE__, __LINE__)); 1345 KASSERT(error == 0, 1346 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1347 __func__, __FILE__, __LINE__)); 1348 1349 if (mp->mnt_flag & MNT_EXPUBLIC) 1350 vfs_setpublicfs(NULL, NULL, NULL); 1351 1352 /* 1353 * From now, we can claim that the use reference on the 1354 * coveredvp is ours, and the ref can be released only by 1355 * successfull unmount by us, or left for later unmount 1356 * attempt. The previously acquired hold reference is no 1357 * longer needed to protect the vnode from reuse. 1358 */ 1359 if (coveredvp != NULL) 1360 vdrop(coveredvp); 1361 1362 vfs_msync(mp, MNT_WAIT); 1363 MNT_ILOCK(mp); 1364 async_flag = mp->mnt_flag & MNT_ASYNC; 1365 mp->mnt_flag &= ~MNT_ASYNC; 1366 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1367 MNT_IUNLOCK(mp); 1368 cache_purgevfs(mp, false); /* remove cache entries for this file sys */ 1369 vfs_deallocate_syncvnode(mp); 1370 /* 1371 * For forced unmounts, move process cdir/rdir refs on the fs root 1372 * vnode to the covered vnode. For non-forced unmounts we want 1373 * such references to cause an EBUSY error. 1374 */ 1375 if ((flags & MNT_FORCE) && 1376 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1377 if (mp->mnt_vnodecovered != NULL && 1378 (mp->mnt_flag & MNT_IGNORE) == 0) 1379 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1380 if (fsrootvp == rootvnode) { 1381 vrele(rootvnode); 1382 rootvnode = NULL; 1383 } 1384 vput(fsrootvp); 1385 } 1386 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1387 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1388 error = VFS_UNMOUNT(mp, flags); 1389 vn_finished_write(mp); 1390 /* 1391 * If we failed to flush the dirty blocks for this mount point, 1392 * undo all the cdir/rdir and rootvnode changes we made above. 1393 * Unless we failed to do so because the device is reporting that 1394 * it doesn't exist anymore. 1395 */ 1396 if (error && error != ENXIO) { 1397 if ((flags & MNT_FORCE) && 1398 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1399 if (mp->mnt_vnodecovered != NULL && 1400 (mp->mnt_flag & MNT_IGNORE) == 0) 1401 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1402 if (rootvnode == NULL) { 1403 rootvnode = fsrootvp; 1404 vref(rootvnode); 1405 } 1406 vput(fsrootvp); 1407 } 1408 MNT_ILOCK(mp); 1409 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1410 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1411 MNT_IUNLOCK(mp); 1412 vfs_allocate_syncvnode(mp); 1413 MNT_ILOCK(mp); 1414 } 1415 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1416 mp->mnt_flag |= async_flag; 1417 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1418 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1419 mp->mnt_kern_flag |= MNTK_ASYNC; 1420 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1421 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1422 wakeup(mp); 1423 } 1424 MNT_IUNLOCK(mp); 1425 if (coveredvp) 1426 VOP_UNLOCK(coveredvp, 0); 1427 return (error); 1428 } 1429 mtx_lock(&mountlist_mtx); 1430 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1431 mtx_unlock(&mountlist_mtx); 1432 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td); 1433 if (coveredvp != NULL) { 1434 coveredvp->v_mountedhere = NULL; 1435 vput(coveredvp); 1436 } 1437 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1438 if (mp == rootdevmp) 1439 rootdevmp = NULL; 1440 vfs_mount_destroy(mp); 1441 return (0); 1442 } 1443 1444 /* 1445 * Report errors during filesystem mounting. 1446 */ 1447 void 1448 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1449 { 1450 struct vfsoptlist *moptlist = mp->mnt_optnew; 1451 va_list ap; 1452 int error, len; 1453 char *errmsg; 1454 1455 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1456 if (error || errmsg == NULL || len <= 0) 1457 return; 1458 1459 va_start(ap, fmt); 1460 vsnprintf(errmsg, (size_t)len, fmt, ap); 1461 va_end(ap); 1462 } 1463 1464 void 1465 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1466 { 1467 va_list ap; 1468 int error, len; 1469 char *errmsg; 1470 1471 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1472 if (error || errmsg == NULL || len <= 0) 1473 return; 1474 1475 va_start(ap, fmt); 1476 vsnprintf(errmsg, (size_t)len, fmt, ap); 1477 va_end(ap); 1478 } 1479 1480 /* 1481 * --------------------------------------------------------------------- 1482 * Functions for querying mount options/arguments from filesystems. 1483 */ 1484 1485 /* 1486 * Check that no unknown options are given 1487 */ 1488 int 1489 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1490 { 1491 struct vfsopt *opt; 1492 char errmsg[255]; 1493 const char **t, *p, *q; 1494 int ret = 0; 1495 1496 TAILQ_FOREACH(opt, opts, link) { 1497 p = opt->name; 1498 q = NULL; 1499 if (p[0] == 'n' && p[1] == 'o') 1500 q = p + 2; 1501 for(t = global_opts; *t != NULL; t++) { 1502 if (strcmp(*t, p) == 0) 1503 break; 1504 if (q != NULL) { 1505 if (strcmp(*t, q) == 0) 1506 break; 1507 } 1508 } 1509 if (*t != NULL) 1510 continue; 1511 for(t = legal; *t != NULL; t++) { 1512 if (strcmp(*t, p) == 0) 1513 break; 1514 if (q != NULL) { 1515 if (strcmp(*t, q) == 0) 1516 break; 1517 } 1518 } 1519 if (*t != NULL) 1520 continue; 1521 snprintf(errmsg, sizeof(errmsg), 1522 "mount option <%s> is unknown", p); 1523 ret = EINVAL; 1524 } 1525 if (ret != 0) { 1526 TAILQ_FOREACH(opt, opts, link) { 1527 if (strcmp(opt->name, "errmsg") == 0) { 1528 strncpy((char *)opt->value, errmsg, opt->len); 1529 break; 1530 } 1531 } 1532 if (opt == NULL) 1533 printf("%s\n", errmsg); 1534 } 1535 return (ret); 1536 } 1537 1538 /* 1539 * Get a mount option by its name. 1540 * 1541 * Return 0 if the option was found, ENOENT otherwise. 1542 * If len is non-NULL it will be filled with the length 1543 * of the option. If buf is non-NULL, it will be filled 1544 * with the address of the option. 1545 */ 1546 int 1547 vfs_getopt(opts, name, buf, len) 1548 struct vfsoptlist *opts; 1549 const char *name; 1550 void **buf; 1551 int *len; 1552 { 1553 struct vfsopt *opt; 1554 1555 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1556 1557 TAILQ_FOREACH(opt, opts, link) { 1558 if (strcmp(name, opt->name) == 0) { 1559 opt->seen = 1; 1560 if (len != NULL) 1561 *len = opt->len; 1562 if (buf != NULL) 1563 *buf = opt->value; 1564 return (0); 1565 } 1566 } 1567 return (ENOENT); 1568 } 1569 1570 int 1571 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1572 { 1573 struct vfsopt *opt; 1574 1575 if (opts == NULL) 1576 return (-1); 1577 1578 TAILQ_FOREACH(opt, opts, link) { 1579 if (strcmp(name, opt->name) == 0) { 1580 opt->seen = 1; 1581 return (opt->pos); 1582 } 1583 } 1584 return (-1); 1585 } 1586 1587 int 1588 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1589 { 1590 char *opt_value, *vtp; 1591 quad_t iv; 1592 int error, opt_len; 1593 1594 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1595 if (error != 0) 1596 return (error); 1597 if (opt_len == 0 || opt_value == NULL) 1598 return (EINVAL); 1599 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1600 return (EINVAL); 1601 iv = strtoq(opt_value, &vtp, 0); 1602 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1603 return (EINVAL); 1604 if (iv < 0) 1605 return (EINVAL); 1606 switch (vtp[0]) { 1607 case 't': 1608 case 'T': 1609 iv *= 1024; 1610 case 'g': 1611 case 'G': 1612 iv *= 1024; 1613 case 'm': 1614 case 'M': 1615 iv *= 1024; 1616 case 'k': 1617 case 'K': 1618 iv *= 1024; 1619 case '\0': 1620 break; 1621 default: 1622 return (EINVAL); 1623 } 1624 *value = iv; 1625 1626 return (0); 1627 } 1628 1629 char * 1630 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1631 { 1632 struct vfsopt *opt; 1633 1634 *error = 0; 1635 TAILQ_FOREACH(opt, opts, link) { 1636 if (strcmp(name, opt->name) != 0) 1637 continue; 1638 opt->seen = 1; 1639 if (opt->len == 0 || 1640 ((char *)opt->value)[opt->len - 1] != '\0') { 1641 *error = EINVAL; 1642 return (NULL); 1643 } 1644 return (opt->value); 1645 } 1646 *error = ENOENT; 1647 return (NULL); 1648 } 1649 1650 int 1651 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1652 uint64_t val) 1653 { 1654 struct vfsopt *opt; 1655 1656 TAILQ_FOREACH(opt, opts, link) { 1657 if (strcmp(name, opt->name) == 0) { 1658 opt->seen = 1; 1659 if (w != NULL) 1660 *w |= val; 1661 return (1); 1662 } 1663 } 1664 if (w != NULL) 1665 *w &= ~val; 1666 return (0); 1667 } 1668 1669 int 1670 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1671 { 1672 va_list ap; 1673 struct vfsopt *opt; 1674 int ret; 1675 1676 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1677 1678 TAILQ_FOREACH(opt, opts, link) { 1679 if (strcmp(name, opt->name) != 0) 1680 continue; 1681 opt->seen = 1; 1682 if (opt->len == 0 || opt->value == NULL) 1683 return (0); 1684 if (((char *)opt->value)[opt->len - 1] != '\0') 1685 return (0); 1686 va_start(ap, fmt); 1687 ret = vsscanf(opt->value, fmt, ap); 1688 va_end(ap); 1689 return (ret); 1690 } 1691 return (0); 1692 } 1693 1694 int 1695 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1696 { 1697 struct vfsopt *opt; 1698 1699 TAILQ_FOREACH(opt, opts, link) { 1700 if (strcmp(name, opt->name) != 0) 1701 continue; 1702 opt->seen = 1; 1703 if (opt->value == NULL) 1704 opt->len = len; 1705 else { 1706 if (opt->len != len) 1707 return (EINVAL); 1708 bcopy(value, opt->value, len); 1709 } 1710 return (0); 1711 } 1712 return (ENOENT); 1713 } 1714 1715 int 1716 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1717 { 1718 struct vfsopt *opt; 1719 1720 TAILQ_FOREACH(opt, opts, link) { 1721 if (strcmp(name, opt->name) != 0) 1722 continue; 1723 opt->seen = 1; 1724 if (opt->value == NULL) 1725 opt->len = len; 1726 else { 1727 if (opt->len < len) 1728 return (EINVAL); 1729 opt->len = len; 1730 bcopy(value, opt->value, len); 1731 } 1732 return (0); 1733 } 1734 return (ENOENT); 1735 } 1736 1737 int 1738 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1739 { 1740 struct vfsopt *opt; 1741 1742 TAILQ_FOREACH(opt, opts, link) { 1743 if (strcmp(name, opt->name) != 0) 1744 continue; 1745 opt->seen = 1; 1746 if (opt->value == NULL) 1747 opt->len = strlen(value) + 1; 1748 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1749 return (EINVAL); 1750 return (0); 1751 } 1752 return (ENOENT); 1753 } 1754 1755 /* 1756 * Find and copy a mount option. 1757 * 1758 * The size of the buffer has to be specified 1759 * in len, if it is not the same length as the 1760 * mount option, EINVAL is returned. 1761 * Returns ENOENT if the option is not found. 1762 */ 1763 int 1764 vfs_copyopt(opts, name, dest, len) 1765 struct vfsoptlist *opts; 1766 const char *name; 1767 void *dest; 1768 int len; 1769 { 1770 struct vfsopt *opt; 1771 1772 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1773 1774 TAILQ_FOREACH(opt, opts, link) { 1775 if (strcmp(name, opt->name) == 0) { 1776 opt->seen = 1; 1777 if (len != opt->len) 1778 return (EINVAL); 1779 bcopy(opt->value, dest, opt->len); 1780 return (0); 1781 } 1782 } 1783 return (ENOENT); 1784 } 1785 1786 int 1787 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1788 { 1789 int error; 1790 1791 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1792 if (sbp != &mp->mnt_stat) 1793 *sbp = mp->mnt_stat; 1794 return (error); 1795 } 1796 1797 void 1798 vfs_mountedfrom(struct mount *mp, const char *from) 1799 { 1800 1801 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1802 strlcpy(mp->mnt_stat.f_mntfromname, from, 1803 sizeof mp->mnt_stat.f_mntfromname); 1804 } 1805 1806 /* 1807 * --------------------------------------------------------------------- 1808 * This is the api for building mount args and mounting filesystems from 1809 * inside the kernel. 1810 * 1811 * The API works by accumulation of individual args. First error is 1812 * latched. 1813 * 1814 * XXX: should be documented in new manpage kernel_mount(9) 1815 */ 1816 1817 /* A memory allocation which must be freed when we are done */ 1818 struct mntaarg { 1819 SLIST_ENTRY(mntaarg) next; 1820 }; 1821 1822 /* The header for the mount arguments */ 1823 struct mntarg { 1824 struct iovec *v; 1825 int len; 1826 int error; 1827 SLIST_HEAD(, mntaarg) list; 1828 }; 1829 1830 /* 1831 * Add a boolean argument. 1832 * 1833 * flag is the boolean value. 1834 * name must start with "no". 1835 */ 1836 struct mntarg * 1837 mount_argb(struct mntarg *ma, int flag, const char *name) 1838 { 1839 1840 KASSERT(name[0] == 'n' && name[1] == 'o', 1841 ("mount_argb(...,%s): name must start with 'no'", name)); 1842 1843 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1844 } 1845 1846 /* 1847 * Add an argument printf style 1848 */ 1849 struct mntarg * 1850 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1851 { 1852 va_list ap; 1853 struct mntaarg *maa; 1854 struct sbuf *sb; 1855 int len; 1856 1857 if (ma == NULL) { 1858 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1859 SLIST_INIT(&ma->list); 1860 } 1861 if (ma->error) 1862 return (ma); 1863 1864 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1865 M_MOUNT, M_WAITOK); 1866 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1867 ma->v[ma->len].iov_len = strlen(name) + 1; 1868 ma->len++; 1869 1870 sb = sbuf_new_auto(); 1871 va_start(ap, fmt); 1872 sbuf_vprintf(sb, fmt, ap); 1873 va_end(ap); 1874 sbuf_finish(sb); 1875 len = sbuf_len(sb) + 1; 1876 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1877 SLIST_INSERT_HEAD(&ma->list, maa, next); 1878 bcopy(sbuf_data(sb), maa + 1, len); 1879 sbuf_delete(sb); 1880 1881 ma->v[ma->len].iov_base = maa + 1; 1882 ma->v[ma->len].iov_len = len; 1883 ma->len++; 1884 1885 return (ma); 1886 } 1887 1888 /* 1889 * Add an argument which is a userland string. 1890 */ 1891 struct mntarg * 1892 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1893 { 1894 struct mntaarg *maa; 1895 char *tbuf; 1896 1897 if (val == NULL) 1898 return (ma); 1899 if (ma == NULL) { 1900 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1901 SLIST_INIT(&ma->list); 1902 } 1903 if (ma->error) 1904 return (ma); 1905 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1906 SLIST_INSERT_HEAD(&ma->list, maa, next); 1907 tbuf = (void *)(maa + 1); 1908 ma->error = copyinstr(val, tbuf, len, NULL); 1909 return (mount_arg(ma, name, tbuf, -1)); 1910 } 1911 1912 /* 1913 * Plain argument. 1914 * 1915 * If length is -1, treat value as a C string. 1916 */ 1917 struct mntarg * 1918 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1919 { 1920 1921 if (ma == NULL) { 1922 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1923 SLIST_INIT(&ma->list); 1924 } 1925 if (ma->error) 1926 return (ma); 1927 1928 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1929 M_MOUNT, M_WAITOK); 1930 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1931 ma->v[ma->len].iov_len = strlen(name) + 1; 1932 ma->len++; 1933 1934 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1935 if (len < 0) 1936 ma->v[ma->len].iov_len = strlen(val) + 1; 1937 else 1938 ma->v[ma->len].iov_len = len; 1939 ma->len++; 1940 return (ma); 1941 } 1942 1943 /* 1944 * Free a mntarg structure 1945 */ 1946 static void 1947 free_mntarg(struct mntarg *ma) 1948 { 1949 struct mntaarg *maa; 1950 1951 while (!SLIST_EMPTY(&ma->list)) { 1952 maa = SLIST_FIRST(&ma->list); 1953 SLIST_REMOVE_HEAD(&ma->list, next); 1954 free(maa, M_MOUNT); 1955 } 1956 free(ma->v, M_MOUNT); 1957 free(ma, M_MOUNT); 1958 } 1959 1960 /* 1961 * Mount a filesystem 1962 */ 1963 int 1964 kernel_mount(struct mntarg *ma, uint64_t flags) 1965 { 1966 struct uio auio; 1967 int error; 1968 1969 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1970 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1971 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1972 1973 auio.uio_iov = ma->v; 1974 auio.uio_iovcnt = ma->len; 1975 auio.uio_segflg = UIO_SYSSPACE; 1976 1977 error = ma->error; 1978 if (!error) 1979 error = vfs_donmount(curthread, flags, &auio); 1980 free_mntarg(ma); 1981 return (error); 1982 } 1983 1984 /* 1985 * A printflike function to mount a filesystem. 1986 */ 1987 int 1988 kernel_vmount(int flags, ...) 1989 { 1990 struct mntarg *ma = NULL; 1991 va_list ap; 1992 const char *cp; 1993 const void *vp; 1994 int error; 1995 1996 va_start(ap, flags); 1997 for (;;) { 1998 cp = va_arg(ap, const char *); 1999 if (cp == NULL) 2000 break; 2001 vp = va_arg(ap, const void *); 2002 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2003 } 2004 va_end(ap); 2005 2006 error = kernel_mount(ma, flags); 2007 return (error); 2008 } 2009 2010 void 2011 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2012 { 2013 2014 bcopy(oexp, exp, sizeof(*oexp)); 2015 exp->ex_numsecflavors = 0; 2016 } 2017