vfs_mount.c revision 244652
1/*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: stable/9/sys/kern/vfs_mount.c 244652 2012-12-24 13:01:07Z kib $"); 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 73static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 74 uint64_t fsflags, struct vfsoptlist **optlist); 75static void free_mntarg(struct mntarg *ma); 76 77static int usermount = 0; 78SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 79 "Unprivileged users may mount and unmount file systems"); 80 81MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 82static uma_zone_t mount_zone; 83 84/* List of mounted filesystems. */ 85struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87/* For any iteration/modification of mountlist */ 88struct mtx mountlist_mtx; 89MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91/* 92 * Global opts, taken by all filesystems 93 */ 94static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103}; 104 105static int 106mount_init(void *mem, int size, int flags) 107{ 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 113 return (0); 114} 115 116static void 117mount_fini(void *mem, int size) 118{ 119 struct mount *mp; 120 121 mp = (struct mount *)mem; 122 lockdestroy(&mp->mnt_explock); 123 mtx_destroy(&mp->mnt_mtx); 124} 125 126static void 127vfs_mount_init(void *dummy __unused) 128{ 129 130 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 131 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 132} 133SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 134 135/* 136 * --------------------------------------------------------------------- 137 * Functions for building and sanitizing the mount options 138 */ 139 140/* Remove one mount option. */ 141static void 142vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 143{ 144 145 TAILQ_REMOVE(opts, opt, link); 146 free(opt->name, M_MOUNT); 147 if (opt->value != NULL) 148 free(opt->value, M_MOUNT); 149 free(opt, M_MOUNT); 150} 151 152/* Release all resources related to the mount options. */ 153void 154vfs_freeopts(struct vfsoptlist *opts) 155{ 156 struct vfsopt *opt; 157 158 while (!TAILQ_EMPTY(opts)) { 159 opt = TAILQ_FIRST(opts); 160 vfs_freeopt(opts, opt); 161 } 162 free(opts, M_MOUNT); 163} 164 165void 166vfs_deleteopt(struct vfsoptlist *opts, const char *name) 167{ 168 struct vfsopt *opt, *temp; 169 170 if (opts == NULL) 171 return; 172 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 173 if (strcmp(opt->name, name) == 0) 174 vfs_freeopt(opts, opt); 175 } 176} 177 178static int 179vfs_isopt_ro(const char *opt) 180{ 181 182 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 183 strcmp(opt, "norw") == 0) 184 return (1); 185 return (0); 186} 187 188static int 189vfs_isopt_rw(const char *opt) 190{ 191 192 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 193 return (1); 194 return (0); 195} 196 197/* 198 * Check if options are equal (with or without the "no" prefix). 199 */ 200static int 201vfs_equalopts(const char *opt1, const char *opt2) 202{ 203 char *p; 204 205 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 206 if (strcmp(opt1, opt2) == 0) 207 return (1); 208 /* "noopt" vs. "opt" */ 209 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 210 return (1); 211 /* "opt" vs. "noopt" */ 212 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 213 return (1); 214 while ((p = strchr(opt1, '.')) != NULL && 215 !strncmp(opt1, opt2, ++p - opt1)) { 216 opt2 += p - opt1; 217 opt1 = p; 218 /* "foo.noopt" vs. "foo.opt" */ 219 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 220 return (1); 221 /* "foo.opt" vs. "foo.noopt" */ 222 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 223 return (1); 224 } 225 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 226 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 227 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 228 return (1); 229 return (0); 230} 231 232/* 233 * If a mount option is specified several times, 234 * (with or without the "no" prefix) only keep 235 * the last occurence of it. 236 */ 237static void 238vfs_sanitizeopts(struct vfsoptlist *opts) 239{ 240 struct vfsopt *opt, *opt2, *tmp; 241 242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 243 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 244 while (opt2 != NULL) { 245 if (vfs_equalopts(opt->name, opt2->name)) { 246 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 247 vfs_freeopt(opts, opt2); 248 opt2 = tmp; 249 } else { 250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 251 } 252 } 253 } 254} 255 256/* 257 * Build a linked list of mount options from a struct uio. 258 */ 259int 260vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 261{ 262 struct vfsoptlist *opts; 263 struct vfsopt *opt; 264 size_t memused, namelen, optlen; 265 unsigned int i, iovcnt; 266 int error; 267 268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 269 TAILQ_INIT(opts); 270 memused = 0; 271 iovcnt = auio->uio_iovcnt; 272 for (i = 0; i < iovcnt; i += 2) { 273 namelen = auio->uio_iov[i].iov_len; 274 optlen = auio->uio_iov[i + 1].iov_len; 275 memused += sizeof(struct vfsopt) + optlen + namelen; 276 /* 277 * Avoid consuming too much memory, and attempts to overflow 278 * memused. 279 */ 280 if (memused > VFS_MOUNTARG_SIZE_MAX || 281 optlen > VFS_MOUNTARG_SIZE_MAX || 282 namelen > VFS_MOUNTARG_SIZE_MAX) { 283 error = EINVAL; 284 goto bad; 285 } 286 287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 289 opt->value = NULL; 290 opt->len = 0; 291 opt->pos = i / 2; 292 opt->seen = 0; 293 294 /* 295 * Do this early, so jumps to "bad" will free the current 296 * option. 297 */ 298 TAILQ_INSERT_TAIL(opts, opt, link); 299 300 if (auio->uio_segflg == UIO_SYSSPACE) { 301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 302 } else { 303 error = copyin(auio->uio_iov[i].iov_base, opt->name, 304 namelen); 305 if (error) 306 goto bad; 307 } 308 /* Ensure names are null-terminated strings. */ 309 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 310 error = EINVAL; 311 goto bad; 312 } 313 if (optlen != 0) { 314 opt->len = optlen; 315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 316 if (auio->uio_segflg == UIO_SYSSPACE) { 317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 318 optlen); 319 } else { 320 error = copyin(auio->uio_iov[i + 1].iov_base, 321 opt->value, optlen); 322 if (error) 323 goto bad; 324 } 325 } 326 } 327 vfs_sanitizeopts(opts); 328 *options = opts; 329 return (0); 330bad: 331 vfs_freeopts(opts); 332 return (error); 333} 334 335/* 336 * Merge the old mount options with the new ones passed 337 * in the MNT_UPDATE case. 338 * 339 * XXX: This function will keep a "nofoo" option in the new 340 * options. E.g, if the option's canonical name is "foo", 341 * "nofoo" ends up in the mount point's active options. 342 */ 343static void 344vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 345{ 346 struct vfsopt *opt, *new; 347 348 TAILQ_FOREACH(opt, oldopts, link) { 349 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 350 new->name = strdup(opt->name, M_MOUNT); 351 if (opt->len != 0) { 352 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 353 bcopy(opt->value, new->value, opt->len); 354 } else 355 new->value = NULL; 356 new->len = opt->len; 357 new->seen = opt->seen; 358 TAILQ_INSERT_HEAD(toopts, new, link); 359 } 360 vfs_sanitizeopts(toopts); 361} 362 363/* 364 * Mount a filesystem. 365 */ 366int 367sys_nmount(td, uap) 368 struct thread *td; 369 struct nmount_args /* { 370 struct iovec *iovp; 371 unsigned int iovcnt; 372 int flags; 373 } */ *uap; 374{ 375 struct uio *auio; 376 int error; 377 u_int iovcnt; 378 uint64_t flags; 379 380 /* 381 * Mount flags are now 64-bits. On 32-bit archtectures only 382 * 32-bits are passed in, but from here on everything handles 383 * 64-bit flags correctly. 384 */ 385 flags = uap->flags; 386 387 AUDIT_ARG_FFLAGS(flags); 388 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 389 uap->iovp, uap->iovcnt, flags); 390 391 /* 392 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 393 * userspace to set this flag, but we must filter it out if we want 394 * MNT_UPDATE on the root file system to work. 395 * MNT_ROOTFS should only be set by the kernel when mounting its 396 * root file system. 397 */ 398 flags &= ~MNT_ROOTFS; 399 400 iovcnt = uap->iovcnt; 401 /* 402 * Check that we have an even number of iovec's 403 * and that we have at least two options. 404 */ 405 if ((iovcnt & 1) || (iovcnt < 4)) { 406 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 407 uap->iovcnt); 408 return (EINVAL); 409 } 410 411 error = copyinuio(uap->iovp, iovcnt, &auio); 412 if (error) { 413 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 414 __func__, error); 415 return (error); 416 } 417 error = vfs_donmount(td, flags, auio); 418 419 free(auio, M_IOV); 420 return (error); 421} 422 423/* 424 * --------------------------------------------------------------------- 425 * Various utility functions 426 */ 427 428void 429vfs_ref(struct mount *mp) 430{ 431 432 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 433 MNT_ILOCK(mp); 434 MNT_REF(mp); 435 MNT_IUNLOCK(mp); 436} 437 438void 439vfs_rel(struct mount *mp) 440{ 441 442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 443 MNT_ILOCK(mp); 444 MNT_REL(mp); 445 MNT_IUNLOCK(mp); 446} 447 448/* 449 * Allocate and initialize the mount point struct. 450 */ 451struct mount * 452vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 453 struct ucred *cred) 454{ 455 struct mount *mp; 456 457 mp = uma_zalloc(mount_zone, M_WAITOK); 458 bzero(&mp->mnt_startzero, 459 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 460 TAILQ_INIT(&mp->mnt_nvnodelist); 461 mp->mnt_nvnodelistsize = 0; 462 TAILQ_INIT(&mp->mnt_activevnodelist); 463 mp->mnt_activevnodelistsize = 0; 464 mp->mnt_ref = 0; 465 (void) vfs_busy(mp, MBF_NOWAIT); 466 mp->mnt_op = vfsp->vfc_vfsops; 467 mp->mnt_vfc = vfsp; 468 vfsp->vfc_refcount++; /* XXX Unlocked */ 469 mp->mnt_stat.f_type = vfsp->vfc_typenum; 470 mp->mnt_gen++; 471 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 472 mp->mnt_vnodecovered = vp; 473 mp->mnt_cred = crdup(cred); 474 mp->mnt_stat.f_owner = cred->cr_uid; 475 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 476 mp->mnt_iosize_max = DFLTPHYS; 477#ifdef MAC 478 mac_mount_init(mp); 479 mac_mount_create(cred, mp); 480#endif 481 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 482 TAILQ_INIT(&mp->mnt_uppers); 483 return (mp); 484} 485 486/* 487 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 488 */ 489void 490vfs_mount_destroy(struct mount *mp) 491{ 492 493 MNT_ILOCK(mp); 494 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 495 if (mp->mnt_kern_flag & MNTK_MWAIT) { 496 mp->mnt_kern_flag &= ~MNTK_MWAIT; 497 wakeup(mp); 498 } 499 while (mp->mnt_ref) 500 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 501 KASSERT(mp->mnt_ref == 0, 502 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 503 __FILE__, __LINE__)); 504 if (mp->mnt_writeopcount != 0) 505 panic("vfs_mount_destroy: nonzero writeopcount"); 506 if (mp->mnt_secondary_writes != 0) 507 panic("vfs_mount_destroy: nonzero secondary_writes"); 508 mp->mnt_vfc->vfc_refcount--; 509 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 510 struct vnode *vp; 511 512 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 513 vprint("", vp); 514 panic("unmount: dangling vnode"); 515 } 516 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 517 if (mp->mnt_nvnodelistsize != 0) 518 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 519 if (mp->mnt_activevnodelistsize != 0) 520 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 521 if (mp->mnt_lockref != 0) 522 panic("vfs_mount_destroy: nonzero lock refcount"); 523 MNT_IUNLOCK(mp); 524#ifdef MAC 525 mac_mount_destroy(mp); 526#endif 527 if (mp->mnt_opt != NULL) 528 vfs_freeopts(mp->mnt_opt); 529 crfree(mp->mnt_cred); 530 uma_zfree(mount_zone, mp); 531} 532 533int 534vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 535{ 536 struct vfsoptlist *optlist; 537 struct vfsopt *opt, *tmp_opt; 538 char *fstype, *fspath, *errmsg; 539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 540 541 errmsg = fspath = NULL; 542 errmsg_len = fspathlen = 0; 543 errmsg_pos = -1; 544 545 error = vfs_buildopts(fsoptions, &optlist); 546 if (error) 547 return (error); 548 549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 551 552 /* 553 * We need these two options before the others, 554 * and they are mandatory for any filesystem. 555 * Ensure they are NUL terminated as well. 556 */ 557 fstypelen = 0; 558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 559 if (error || fstype[fstypelen - 1] != '\0') { 560 error = EINVAL; 561 if (errmsg != NULL) 562 strncpy(errmsg, "Invalid fstype", errmsg_len); 563 goto bail; 564 } 565 fspathlen = 0; 566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 567 if (error || fspath[fspathlen - 1] != '\0') { 568 error = EINVAL; 569 if (errmsg != NULL) 570 strncpy(errmsg, "Invalid fspath", errmsg_len); 571 goto bail; 572 } 573 574 /* 575 * We need to see if we have the "update" option 576 * before we call vfs_domount(), since vfs_domount() has special 577 * logic based on MNT_UPDATE. This is very important 578 * when we want to update the root filesystem. 579 */ 580 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 581 if (strcmp(opt->name, "update") == 0) { 582 fsflags |= MNT_UPDATE; 583 vfs_freeopt(optlist, opt); 584 } 585 else if (strcmp(opt->name, "async") == 0) 586 fsflags |= MNT_ASYNC; 587 else if (strcmp(opt->name, "force") == 0) { 588 fsflags |= MNT_FORCE; 589 vfs_freeopt(optlist, opt); 590 } 591 else if (strcmp(opt->name, "reload") == 0) { 592 fsflags |= MNT_RELOAD; 593 vfs_freeopt(optlist, opt); 594 } 595 else if (strcmp(opt->name, "multilabel") == 0) 596 fsflags |= MNT_MULTILABEL; 597 else if (strcmp(opt->name, "noasync") == 0) 598 fsflags &= ~MNT_ASYNC; 599 else if (strcmp(opt->name, "noatime") == 0) 600 fsflags |= MNT_NOATIME; 601 else if (strcmp(opt->name, "atime") == 0) { 602 free(opt->name, M_MOUNT); 603 opt->name = strdup("nonoatime", M_MOUNT); 604 } 605 else if (strcmp(opt->name, "noclusterr") == 0) 606 fsflags |= MNT_NOCLUSTERR; 607 else if (strcmp(opt->name, "clusterr") == 0) { 608 free(opt->name, M_MOUNT); 609 opt->name = strdup("nonoclusterr", M_MOUNT); 610 } 611 else if (strcmp(opt->name, "noclusterw") == 0) 612 fsflags |= MNT_NOCLUSTERW; 613 else if (strcmp(opt->name, "clusterw") == 0) { 614 free(opt->name, M_MOUNT); 615 opt->name = strdup("nonoclusterw", M_MOUNT); 616 } 617 else if (strcmp(opt->name, "noexec") == 0) 618 fsflags |= MNT_NOEXEC; 619 else if (strcmp(opt->name, "exec") == 0) { 620 free(opt->name, M_MOUNT); 621 opt->name = strdup("nonoexec", M_MOUNT); 622 } 623 else if (strcmp(opt->name, "nosuid") == 0) 624 fsflags |= MNT_NOSUID; 625 else if (strcmp(opt->name, "suid") == 0) { 626 free(opt->name, M_MOUNT); 627 opt->name = strdup("nonosuid", M_MOUNT); 628 } 629 else if (strcmp(opt->name, "nosymfollow") == 0) 630 fsflags |= MNT_NOSYMFOLLOW; 631 else if (strcmp(opt->name, "symfollow") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("nonosymfollow", M_MOUNT); 634 } 635 else if (strcmp(opt->name, "noro") == 0) 636 fsflags &= ~MNT_RDONLY; 637 else if (strcmp(opt->name, "rw") == 0) 638 fsflags &= ~MNT_RDONLY; 639 else if (strcmp(opt->name, "ro") == 0) 640 fsflags |= MNT_RDONLY; 641 else if (strcmp(opt->name, "rdonly") == 0) { 642 free(opt->name, M_MOUNT); 643 opt->name = strdup("ro", M_MOUNT); 644 fsflags |= MNT_RDONLY; 645 } 646 else if (strcmp(opt->name, "suiddir") == 0) 647 fsflags |= MNT_SUIDDIR; 648 else if (strcmp(opt->name, "sync") == 0) 649 fsflags |= MNT_SYNCHRONOUS; 650 else if (strcmp(opt->name, "union") == 0) 651 fsflags |= MNT_UNION; 652 } 653 654 /* 655 * Be ultra-paranoid about making sure the type and fspath 656 * variables will fit in our mp buffers, including the 657 * terminating NUL. 658 */ 659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 660 error = ENAMETOOLONG; 661 goto bail; 662 } 663 664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 665bail: 666 /* copyout the errmsg */ 667 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 668 && errmsg_len > 0 && errmsg != NULL) { 669 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 670 bcopy(errmsg, 671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 673 } else { 674 copyout(errmsg, 675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 677 } 678 } 679 680 if (optlist != NULL) 681 vfs_freeopts(optlist); 682 return (error); 683} 684 685/* 686 * Old mount API. 687 */ 688#ifndef _SYS_SYSPROTO_H_ 689struct mount_args { 690 char *type; 691 char *path; 692 int flags; 693 caddr_t data; 694}; 695#endif 696/* ARGSUSED */ 697int 698sys_mount(td, uap) 699 struct thread *td; 700 struct mount_args /* { 701 char *type; 702 char *path; 703 int flags; 704 caddr_t data; 705 } */ *uap; 706{ 707 char *fstype; 708 struct vfsconf *vfsp = NULL; 709 struct mntarg *ma = NULL; 710 uint64_t flags; 711 int error; 712 713 /* 714 * Mount flags are now 64-bits. On 32-bit architectures only 715 * 32-bits are passed in, but from here on everything handles 716 * 64-bit flags correctly. 717 */ 718 flags = uap->flags; 719 720 AUDIT_ARG_FFLAGS(flags); 721 722 /* 723 * Filter out MNT_ROOTFS. We do not want clients of mount() in 724 * userspace to set this flag, but we must filter it out if we want 725 * MNT_UPDATE on the root file system to work. 726 * MNT_ROOTFS should only be set by the kernel when mounting its 727 * root file system. 728 */ 729 flags &= ~MNT_ROOTFS; 730 731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 733 if (error) { 734 free(fstype, M_TEMP); 735 return (error); 736 } 737 738 AUDIT_ARG_TEXT(fstype); 739 mtx_lock(&Giant); 740 vfsp = vfs_byname_kld(fstype, td, &error); 741 free(fstype, M_TEMP); 742 if (vfsp == NULL) { 743 mtx_unlock(&Giant); 744 return (ENOENT); 745 } 746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 747 mtx_unlock(&Giant); 748 return (EOPNOTSUPP); 749 } 750 751 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 752 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 753 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 754 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 755 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 756 757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 758 mtx_unlock(&Giant); 759 return (error); 760} 761 762/* 763 * vfs_domount_first(): first file system mount (not update) 764 */ 765static int 766vfs_domount_first( 767 struct thread *td, /* Calling thread. */ 768 struct vfsconf *vfsp, /* File system type. */ 769 char *fspath, /* Mount path. */ 770 struct vnode *vp, /* Vnode to be covered. */ 771 uint64_t fsflags, /* Flags common to all filesystems. */ 772 struct vfsoptlist **optlist /* Options local to the filesystem. */ 773 ) 774{ 775 struct vattr va; 776 struct mount *mp; 777 struct vnode *newdp; 778 int error; 779 780 mtx_assert(&Giant, MA_OWNED); 781 ASSERT_VOP_ELOCKED(vp, __func__); 782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 783 784 /* 785 * If the user is not root, ensure that they own the directory 786 * onto which we are attempting to mount. 787 */ 788 error = VOP_GETATTR(vp, &va, td->td_ucred); 789 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 790 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 791 if (error == 0) 792 error = vinvalbuf(vp, V_SAVE, 0, 0); 793 if (error == 0 && vp->v_type != VDIR) 794 error = ENOTDIR; 795 if (error == 0) { 796 VI_LOCK(vp); 797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 798 vp->v_iflag |= VI_MOUNT; 799 else 800 error = EBUSY; 801 VI_UNLOCK(vp); 802 } 803 if (error != 0) { 804 vput(vp); 805 return (error); 806 } 807 VOP_UNLOCK(vp, 0); 808 809 /* Allocate and initialize the filesystem. */ 810 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 811 /* XXXMAC: pass to vfs_mount_alloc? */ 812 mp->mnt_optnew = *optlist; 813 /* Set the mount level flags. */ 814 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 815 816 /* 817 * Mount the filesystem. 818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 819 * get. No freeing of cn_pnbuf. 820 */ 821 error = VFS_MOUNT(mp); 822 if (error != 0) { 823 vfs_unbusy(mp); 824 vfs_mount_destroy(mp); 825 VI_LOCK(vp); 826 vp->v_iflag &= ~VI_MOUNT; 827 VI_UNLOCK(vp); 828 vrele(vp); 829 return (error); 830 } 831 832 if (mp->mnt_opt != NULL) 833 vfs_freeopts(mp->mnt_opt); 834 mp->mnt_opt = mp->mnt_optnew; 835 *optlist = NULL; 836 (void)VFS_STATFS(mp, &mp->mnt_stat); 837 838 /* 839 * Prevent external consumers of mount options from reading mnt_optnew. 840 */ 841 mp->mnt_optnew = NULL; 842 843 MNT_ILOCK(mp); 844 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 845 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 846 mp->mnt_kern_flag |= MNTK_ASYNC; 847 else 848 mp->mnt_kern_flag &= ~MNTK_ASYNC; 849 MNT_IUNLOCK(mp); 850 851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 852 cache_purge(vp); 853 VI_LOCK(vp); 854 vp->v_iflag &= ~VI_MOUNT; 855 VI_UNLOCK(vp); 856 vp->v_mountedhere = mp; 857 /* Place the new filesystem at the end of the mount list. */ 858 mtx_lock(&mountlist_mtx); 859 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 860 mtx_unlock(&mountlist_mtx); 861 vfs_event_signal(NULL, VQ_MOUNT, 0); 862 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 863 panic("mount: lost mount"); 864 VOP_UNLOCK(newdp, 0); 865 VOP_UNLOCK(vp, 0); 866 mountcheckdirs(vp, newdp); 867 vrele(newdp); 868 if ((mp->mnt_flag & MNT_RDONLY) == 0) 869 vfs_allocate_syncvnode(mp); 870 vfs_unbusy(mp); 871 return (0); 872} 873 874/* 875 * vfs_domount_update(): update of mounted file system 876 */ 877static int 878vfs_domount_update( 879 struct thread *td, /* Calling thread. */ 880 struct vnode *vp, /* Mount point vnode. */ 881 uint64_t fsflags, /* Flags common to all filesystems. */ 882 struct vfsoptlist **optlist /* Options local to the filesystem. */ 883 ) 884{ 885 struct oexport_args oexport; 886 struct export_args export; 887 struct mount *mp; 888 int error, export_error; 889 uint64_t flag; 890 891 mtx_assert(&Giant, MA_OWNED); 892 ASSERT_VOP_ELOCKED(vp, __func__); 893 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 894 895 if ((vp->v_vflag & VV_ROOT) == 0) { 896 vput(vp); 897 return (EINVAL); 898 } 899 mp = vp->v_mount; 900 /* 901 * We only allow the filesystem to be reloaded if it 902 * is currently mounted read-only. 903 */ 904 flag = mp->mnt_flag; 905 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 906 vput(vp); 907 return (EOPNOTSUPP); /* Needs translation */ 908 } 909 /* 910 * Only privileged root, or (if MNT_USER is set) the user that 911 * did the original mount is permitted to update it. 912 */ 913 error = vfs_suser(mp, td); 914 if (error != 0) { 915 vput(vp); 916 return (error); 917 } 918 if (vfs_busy(mp, MBF_NOWAIT)) { 919 vput(vp); 920 return (EBUSY); 921 } 922 VI_LOCK(vp); 923 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 924 VI_UNLOCK(vp); 925 vfs_unbusy(mp); 926 vput(vp); 927 return (EBUSY); 928 } 929 vp->v_iflag |= VI_MOUNT; 930 VI_UNLOCK(vp); 931 VOP_UNLOCK(vp, 0); 932 933 MNT_ILOCK(mp); 934 mp->mnt_flag &= ~MNT_UPDATEMASK; 935 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 936 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 937 if ((mp->mnt_flag & MNT_ASYNC) == 0) 938 mp->mnt_kern_flag &= ~MNTK_ASYNC; 939 MNT_IUNLOCK(mp); 940 mp->mnt_optnew = *optlist; 941 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 942 943 /* 944 * Mount the filesystem. 945 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 946 * get. No freeing of cn_pnbuf. 947 */ 948 error = VFS_MOUNT(mp); 949 950 export_error = 0; 951 if (error == 0) { 952 /* Process the export option. */ 953 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 954 sizeof(export)) == 0) { 955 export_error = vfs_export(mp, &export); 956 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 957 sizeof(oexport)) == 0) { 958 export.ex_flags = oexport.ex_flags; 959 export.ex_root = oexport.ex_root; 960 export.ex_anon = oexport.ex_anon; 961 export.ex_addr = oexport.ex_addr; 962 export.ex_addrlen = oexport.ex_addrlen; 963 export.ex_mask = oexport.ex_mask; 964 export.ex_masklen = oexport.ex_masklen; 965 export.ex_indexfile = oexport.ex_indexfile; 966 export.ex_numsecflavors = 0; 967 export_error = vfs_export(mp, &export); 968 } 969 } 970 971 MNT_ILOCK(mp); 972 if (error == 0) { 973 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 974 MNT_SNAPSHOT); 975 } else { 976 /* 977 * If we fail, restore old mount flags. MNT_QUOTA is special, 978 * because it is not part of MNT_UPDATEMASK, but it could have 979 * changed in the meantime if quotactl(2) was called. 980 * All in all we want current value of MNT_QUOTA, not the old 981 * one. 982 */ 983 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 984 } 985 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 986 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 987 mp->mnt_kern_flag |= MNTK_ASYNC; 988 else 989 mp->mnt_kern_flag &= ~MNTK_ASYNC; 990 MNT_IUNLOCK(mp); 991 992 if (error != 0) 993 goto end; 994 995 if (mp->mnt_opt != NULL) 996 vfs_freeopts(mp->mnt_opt); 997 mp->mnt_opt = mp->mnt_optnew; 998 *optlist = NULL; 999 (void)VFS_STATFS(mp, &mp->mnt_stat); 1000 /* 1001 * Prevent external consumers of mount options from reading 1002 * mnt_optnew. 1003 */ 1004 mp->mnt_optnew = NULL; 1005 1006 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1007 vfs_allocate_syncvnode(mp); 1008 else 1009 vfs_deallocate_syncvnode(mp); 1010end: 1011 vfs_unbusy(mp); 1012 VI_LOCK(vp); 1013 vp->v_iflag &= ~VI_MOUNT; 1014 VI_UNLOCK(vp); 1015 vrele(vp); 1016 return (error != 0 ? error : export_error); 1017} 1018 1019/* 1020 * vfs_domount(): actually attempt a filesystem mount. 1021 */ 1022static int 1023vfs_domount( 1024 struct thread *td, /* Calling thread. */ 1025 const char *fstype, /* Filesystem type. */ 1026 char *fspath, /* Mount path. */ 1027 uint64_t fsflags, /* Flags common to all filesystems. */ 1028 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1029 ) 1030{ 1031 struct vfsconf *vfsp; 1032 struct nameidata nd; 1033 struct vnode *vp; 1034 char *pathbuf; 1035 int error; 1036 1037 /* 1038 * Be ultra-paranoid about making sure the type and fspath 1039 * variables will fit in our mp buffers, including the 1040 * terminating NUL. 1041 */ 1042 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1043 return (ENAMETOOLONG); 1044 1045 if (jailed(td->td_ucred) || usermount == 0) { 1046 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1047 return (error); 1048 } 1049 1050 /* 1051 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1052 */ 1053 if (fsflags & MNT_EXPORTED) { 1054 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1055 if (error) 1056 return (error); 1057 } 1058 if (fsflags & MNT_SUIDDIR) { 1059 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1060 if (error) 1061 return (error); 1062 } 1063 /* 1064 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1065 */ 1066 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1067 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1068 fsflags |= MNT_NOSUID | MNT_USER; 1069 } 1070 1071 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1072 vfsp = NULL; 1073 if ((fsflags & MNT_UPDATE) == 0) { 1074 /* Don't try to load KLDs if we're mounting the root. */ 1075 if (fsflags & MNT_ROOTFS) 1076 vfsp = vfs_byname(fstype); 1077 else 1078 vfsp = vfs_byname_kld(fstype, td, &error); 1079 if (vfsp == NULL) 1080 return (ENODEV); 1081 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1082 return (EPERM); 1083 } 1084 1085 /* 1086 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1087 */ 1088 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1089 UIO_SYSSPACE, fspath, td); 1090 error = namei(&nd); 1091 if (error != 0) 1092 return (error); 1093 if (!NDHASGIANT(&nd)) 1094 mtx_lock(&Giant); 1095 NDFREE(&nd, NDF_ONLY_PNBUF); 1096 vp = nd.ni_vp; 1097 if ((fsflags & MNT_UPDATE) == 0) { 1098 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1099 strcpy(pathbuf, fspath); 1100 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1101 /* debug.disablefullpath == 1 results in ENODEV */ 1102 if (error == 0 || error == ENODEV) { 1103 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1104 fsflags, optlist); 1105 } 1106 free(pathbuf, M_TEMP); 1107 } else 1108 error = vfs_domount_update(td, vp, fsflags, optlist); 1109 mtx_unlock(&Giant); 1110 1111 ASSERT_VI_UNLOCKED(vp, __func__); 1112 ASSERT_VOP_UNLOCKED(vp, __func__); 1113 1114 return (error); 1115} 1116 1117/* 1118 * Unmount a filesystem. 1119 * 1120 * Note: unmount takes a path to the vnode mounted on as argument, not 1121 * special file (as before). 1122 */ 1123#ifndef _SYS_SYSPROTO_H_ 1124struct unmount_args { 1125 char *path; 1126 int flags; 1127}; 1128#endif 1129/* ARGSUSED */ 1130int 1131sys_unmount(td, uap) 1132 struct thread *td; 1133 register struct unmount_args /* { 1134 char *path; 1135 int flags; 1136 } */ *uap; 1137{ 1138 struct nameidata nd; 1139 struct mount *mp; 1140 char *pathbuf; 1141 int error, id0, id1, vfslocked; 1142 1143 AUDIT_ARG_VALUE(uap->flags); 1144 if (jailed(td->td_ucred) || usermount == 0) { 1145 error = priv_check(td, PRIV_VFS_UNMOUNT); 1146 if (error) 1147 return (error); 1148 } 1149 1150 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1151 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1152 if (error) { 1153 free(pathbuf, M_TEMP); 1154 return (error); 1155 } 1156 mtx_lock(&Giant); 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 mtx_unlock(&Giant); 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 break; 1171 } 1172 mtx_unlock(&mountlist_mtx); 1173 } else { 1174 /* 1175 * Try to find global path for path argument. 1176 */ 1177 NDINIT(&nd, LOOKUP, 1178 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1179 UIO_SYSSPACE, pathbuf, td); 1180 if (namei(&nd) == 0) { 1181 vfslocked = NDHASGIANT(&nd); 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 VFS_UNLOCK_GIANT(vfslocked); 1188 } 1189 mtx_lock(&mountlist_mtx); 1190 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1191 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1192 break; 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 mtx_unlock(&Giant); 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 mtx_unlock(&Giant); 1213 return (EINVAL); 1214 } 1215 error = dounmount(mp, uap->flags, td); 1216 mtx_unlock(&Giant); 1217 return (error); 1218} 1219 1220/* 1221 * Do the actual filesystem unmount. 1222 */ 1223int 1224dounmount(mp, flags, td) 1225 struct mount *mp; 1226 int flags; 1227 struct thread *td; 1228{ 1229 struct vnode *coveredvp, *fsrootvp; 1230 int error; 1231 uint64_t async_flag; 1232 int mnt_gen_r; 1233 1234 mtx_assert(&Giant, MA_OWNED); 1235 1236 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1237 mnt_gen_r = mp->mnt_gen; 1238 VI_LOCK(coveredvp); 1239 vholdl(coveredvp); 1240 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1241 vdrop(coveredvp); 1242 /* 1243 * Check for mp being unmounted while waiting for the 1244 * covered vnode lock. 1245 */ 1246 if (coveredvp->v_mountedhere != mp || 1247 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1248 VOP_UNLOCK(coveredvp, 0); 1249 return (EBUSY); 1250 } 1251 } 1252 /* 1253 * Only privileged root, or (if MNT_USER is set) the user that did the 1254 * original mount is permitted to unmount this filesystem. 1255 */ 1256 error = vfs_suser(mp, td); 1257 if (error) { 1258 if (coveredvp) 1259 VOP_UNLOCK(coveredvp, 0); 1260 return (error); 1261 } 1262 1263 MNT_ILOCK(mp); 1264 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1265 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1266 MNT_IUNLOCK(mp); 1267 if (coveredvp) 1268 VOP_UNLOCK(coveredvp, 0); 1269 return (EBUSY); 1270 } 1271 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1272 /* Allow filesystems to detect that a forced unmount is in progress. */ 1273 if (flags & MNT_FORCE) 1274 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1275 error = 0; 1276 if (mp->mnt_lockref) { 1277 mp->mnt_kern_flag |= MNTK_DRAINING; 1278 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1279 "mount drain", 0); 1280 } 1281 MNT_IUNLOCK(mp); 1282 KASSERT(mp->mnt_lockref == 0, 1283 ("%s: invalid lock refcount in the drain path @ %s:%d", 1284 __func__, __FILE__, __LINE__)); 1285 KASSERT(error == 0, 1286 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1287 __func__, __FILE__, __LINE__)); 1288 vn_start_write(NULL, &mp, V_WAIT); 1289 1290 if (mp->mnt_flag & MNT_EXPUBLIC) 1291 vfs_setpublicfs(NULL, NULL, NULL); 1292 1293 vfs_msync(mp, MNT_WAIT); 1294 MNT_ILOCK(mp); 1295 async_flag = mp->mnt_flag & MNT_ASYNC; 1296 mp->mnt_flag &= ~MNT_ASYNC; 1297 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1298 MNT_IUNLOCK(mp); 1299 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1300 vfs_deallocate_syncvnode(mp); 1301 /* 1302 * For forced unmounts, move process cdir/rdir refs on the fs root 1303 * vnode to the covered vnode. For non-forced unmounts we want 1304 * such references to cause an EBUSY error. 1305 */ 1306 if ((flags & MNT_FORCE) && 1307 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1308 if (mp->mnt_vnodecovered != NULL) 1309 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1310 if (fsrootvp == rootvnode) { 1311 vrele(rootvnode); 1312 rootvnode = NULL; 1313 } 1314 vput(fsrootvp); 1315 } 1316 if (((mp->mnt_flag & MNT_RDONLY) || 1317 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1318 error = VFS_UNMOUNT(mp, flags); 1319 vn_finished_write(mp); 1320 /* 1321 * If we failed to flush the dirty blocks for this mount point, 1322 * undo all the cdir/rdir and rootvnode changes we made above. 1323 * Unless we failed to do so because the device is reporting that 1324 * it doesn't exist anymore. 1325 */ 1326 if (error && error != ENXIO) { 1327 if ((flags & MNT_FORCE) && 1328 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1329 if (mp->mnt_vnodecovered != NULL) 1330 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1331 if (rootvnode == NULL) { 1332 rootvnode = fsrootvp; 1333 vref(rootvnode); 1334 } 1335 vput(fsrootvp); 1336 } 1337 MNT_ILOCK(mp); 1338 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1339 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1340 MNT_IUNLOCK(mp); 1341 vfs_allocate_syncvnode(mp); 1342 MNT_ILOCK(mp); 1343 } 1344 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1345 mp->mnt_flag |= async_flag; 1346 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1347 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1348 mp->mnt_kern_flag |= MNTK_ASYNC; 1349 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1350 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1351 wakeup(mp); 1352 } 1353 MNT_IUNLOCK(mp); 1354 if (coveredvp) 1355 VOP_UNLOCK(coveredvp, 0); 1356 return (error); 1357 } 1358 mtx_lock(&mountlist_mtx); 1359 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1360 mtx_unlock(&mountlist_mtx); 1361 if (coveredvp != NULL) { 1362 coveredvp->v_mountedhere = NULL; 1363 vput(coveredvp); 1364 } 1365 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1366 vfs_mount_destroy(mp); 1367 return (0); 1368} 1369 1370/* 1371 * Report errors during filesystem mounting. 1372 */ 1373void 1374vfs_mount_error(struct mount *mp, const char *fmt, ...) 1375{ 1376 struct vfsoptlist *moptlist = mp->mnt_optnew; 1377 va_list ap; 1378 int error, len; 1379 char *errmsg; 1380 1381 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1382 if (error || errmsg == NULL || len <= 0) 1383 return; 1384 1385 va_start(ap, fmt); 1386 vsnprintf(errmsg, (size_t)len, fmt, ap); 1387 va_end(ap); 1388} 1389 1390void 1391vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1392{ 1393 va_list ap; 1394 int error, len; 1395 char *errmsg; 1396 1397 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1398 if (error || errmsg == NULL || len <= 0) 1399 return; 1400 1401 va_start(ap, fmt); 1402 vsnprintf(errmsg, (size_t)len, fmt, ap); 1403 va_end(ap); 1404} 1405 1406/* 1407 * --------------------------------------------------------------------- 1408 * Functions for querying mount options/arguments from filesystems. 1409 */ 1410 1411/* 1412 * Check that no unknown options are given 1413 */ 1414int 1415vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1416{ 1417 struct vfsopt *opt; 1418 char errmsg[255]; 1419 const char **t, *p, *q; 1420 int ret = 0; 1421 1422 TAILQ_FOREACH(opt, opts, link) { 1423 p = opt->name; 1424 q = NULL; 1425 if (p[0] == 'n' && p[1] == 'o') 1426 q = p + 2; 1427 for(t = global_opts; *t != NULL; t++) { 1428 if (strcmp(*t, p) == 0) 1429 break; 1430 if (q != NULL) { 1431 if (strcmp(*t, q) == 0) 1432 break; 1433 } 1434 } 1435 if (*t != NULL) 1436 continue; 1437 for(t = legal; *t != NULL; t++) { 1438 if (strcmp(*t, p) == 0) 1439 break; 1440 if (q != NULL) { 1441 if (strcmp(*t, q) == 0) 1442 break; 1443 } 1444 } 1445 if (*t != NULL) 1446 continue; 1447 snprintf(errmsg, sizeof(errmsg), 1448 "mount option <%s> is unknown", p); 1449 ret = EINVAL; 1450 } 1451 if (ret != 0) { 1452 TAILQ_FOREACH(opt, opts, link) { 1453 if (strcmp(opt->name, "errmsg") == 0) { 1454 strncpy((char *)opt->value, errmsg, opt->len); 1455 break; 1456 } 1457 } 1458 if (opt == NULL) 1459 printf("%s\n", errmsg); 1460 } 1461 return (ret); 1462} 1463 1464/* 1465 * Get a mount option by its name. 1466 * 1467 * Return 0 if the option was found, ENOENT otherwise. 1468 * If len is non-NULL it will be filled with the length 1469 * of the option. If buf is non-NULL, it will be filled 1470 * with the address of the option. 1471 */ 1472int 1473vfs_getopt(opts, name, buf, len) 1474 struct vfsoptlist *opts; 1475 const char *name; 1476 void **buf; 1477 int *len; 1478{ 1479 struct vfsopt *opt; 1480 1481 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1482 1483 TAILQ_FOREACH(opt, opts, link) { 1484 if (strcmp(name, opt->name) == 0) { 1485 opt->seen = 1; 1486 if (len != NULL) 1487 *len = opt->len; 1488 if (buf != NULL) 1489 *buf = opt->value; 1490 return (0); 1491 } 1492 } 1493 return (ENOENT); 1494} 1495 1496int 1497vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1498{ 1499 struct vfsopt *opt; 1500 1501 if (opts == NULL) 1502 return (-1); 1503 1504 TAILQ_FOREACH(opt, opts, link) { 1505 if (strcmp(name, opt->name) == 0) { 1506 opt->seen = 1; 1507 return (opt->pos); 1508 } 1509 } 1510 return (-1); 1511} 1512 1513char * 1514vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1515{ 1516 struct vfsopt *opt; 1517 1518 *error = 0; 1519 TAILQ_FOREACH(opt, opts, link) { 1520 if (strcmp(name, opt->name) != 0) 1521 continue; 1522 opt->seen = 1; 1523 if (opt->len == 0 || 1524 ((char *)opt->value)[opt->len - 1] != '\0') { 1525 *error = EINVAL; 1526 return (NULL); 1527 } 1528 return (opt->value); 1529 } 1530 *error = ENOENT; 1531 return (NULL); 1532} 1533 1534int 1535vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1536 uint64_t val) 1537{ 1538 struct vfsopt *opt; 1539 1540 TAILQ_FOREACH(opt, opts, link) { 1541 if (strcmp(name, opt->name) == 0) { 1542 opt->seen = 1; 1543 if (w != NULL) 1544 *w |= val; 1545 return (1); 1546 } 1547 } 1548 if (w != NULL) 1549 *w &= ~val; 1550 return (0); 1551} 1552 1553int 1554vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1555{ 1556 va_list ap; 1557 struct vfsopt *opt; 1558 int ret; 1559 1560 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1561 1562 TAILQ_FOREACH(opt, opts, link) { 1563 if (strcmp(name, opt->name) != 0) 1564 continue; 1565 opt->seen = 1; 1566 if (opt->len == 0 || opt->value == NULL) 1567 return (0); 1568 if (((char *)opt->value)[opt->len - 1] != '\0') 1569 return (0); 1570 va_start(ap, fmt); 1571 ret = vsscanf(opt->value, fmt, ap); 1572 va_end(ap); 1573 return (ret); 1574 } 1575 return (0); 1576} 1577 1578int 1579vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1580{ 1581 struct vfsopt *opt; 1582 1583 TAILQ_FOREACH(opt, opts, link) { 1584 if (strcmp(name, opt->name) != 0) 1585 continue; 1586 opt->seen = 1; 1587 if (opt->value == NULL) 1588 opt->len = len; 1589 else { 1590 if (opt->len != len) 1591 return (EINVAL); 1592 bcopy(value, opt->value, len); 1593 } 1594 return (0); 1595 } 1596 return (ENOENT); 1597} 1598 1599int 1600vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1601{ 1602 struct vfsopt *opt; 1603 1604 TAILQ_FOREACH(opt, opts, link) { 1605 if (strcmp(name, opt->name) != 0) 1606 continue; 1607 opt->seen = 1; 1608 if (opt->value == NULL) 1609 opt->len = len; 1610 else { 1611 if (opt->len < len) 1612 return (EINVAL); 1613 opt->len = len; 1614 bcopy(value, opt->value, len); 1615 } 1616 return (0); 1617 } 1618 return (ENOENT); 1619} 1620 1621int 1622vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1623{ 1624 struct vfsopt *opt; 1625 1626 TAILQ_FOREACH(opt, opts, link) { 1627 if (strcmp(name, opt->name) != 0) 1628 continue; 1629 opt->seen = 1; 1630 if (opt->value == NULL) 1631 opt->len = strlen(value) + 1; 1632 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1633 return (EINVAL); 1634 return (0); 1635 } 1636 return (ENOENT); 1637} 1638 1639/* 1640 * Find and copy a mount option. 1641 * 1642 * The size of the buffer has to be specified 1643 * in len, if it is not the same length as the 1644 * mount option, EINVAL is returned. 1645 * Returns ENOENT if the option is not found. 1646 */ 1647int 1648vfs_copyopt(opts, name, dest, len) 1649 struct vfsoptlist *opts; 1650 const char *name; 1651 void *dest; 1652 int len; 1653{ 1654 struct vfsopt *opt; 1655 1656 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1657 1658 TAILQ_FOREACH(opt, opts, link) { 1659 if (strcmp(name, opt->name) == 0) { 1660 opt->seen = 1; 1661 if (len != opt->len) 1662 return (EINVAL); 1663 bcopy(opt->value, dest, opt->len); 1664 return (0); 1665 } 1666 } 1667 return (ENOENT); 1668} 1669 1670/* 1671 * These are helper functions for filesystems to traverse all 1672 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h. 1673 * 1674 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL. 1675 */ 1676 1677MALLOC_DECLARE(M_VNODE_MARKER); 1678 1679struct vnode * 1680__mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1681{ 1682 struct vnode *vp; 1683 1684 mtx_assert(MNT_MTX(mp), MA_OWNED); 1685 1686 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1687 if (should_yield()) { 1688 MNT_IUNLOCK(mp); 1689 kern_yield(PRI_UNCHANGED); 1690 MNT_ILOCK(mp); 1691 } 1692 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1693 while (vp != NULL && vp->v_type == VMARKER) 1694 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1695 1696 /* Check if we are done */ 1697 if (vp == NULL) { 1698 __mnt_vnode_markerfree(mvp, mp); 1699 return (NULL); 1700 } 1701 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1702 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1703 return (vp); 1704} 1705 1706struct vnode * 1707__mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1708{ 1709 struct vnode *vp; 1710 1711 mtx_assert(MNT_MTX(mp), MA_OWNED); 1712 1713 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1714 while (vp != NULL && vp->v_type == VMARKER) 1715 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1716 1717 /* Check if we are done */ 1718 if (vp == NULL) { 1719 *mvp = NULL; 1720 return (NULL); 1721 } 1722 MNT_REF(mp); 1723 MNT_IUNLOCK(mp); 1724 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1725 M_VNODE_MARKER, 1726 M_WAITOK | M_ZERO); 1727 MNT_ILOCK(mp); 1728 (*mvp)->v_type = VMARKER; 1729 1730 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1731 while (vp != NULL && vp->v_type == VMARKER) 1732 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1733 1734 /* Check if we are done */ 1735 if (vp == NULL) { 1736 MNT_IUNLOCK(mp); 1737 free(*mvp, M_VNODE_MARKER); 1738 MNT_ILOCK(mp); 1739 *mvp = NULL; 1740 MNT_REL(mp); 1741 return (NULL); 1742 } 1743 (*mvp)->v_mount = mp; 1744 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1745 return (vp); 1746} 1747 1748 1749void 1750__mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1751{ 1752 1753 if (*mvp == NULL) 1754 return; 1755 1756 mtx_assert(MNT_MTX(mp), MA_OWNED); 1757 1758 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1759 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1760 MNT_IUNLOCK(mp); 1761 free(*mvp, M_VNODE_MARKER); 1762 MNT_ILOCK(mp); 1763 *mvp = NULL; 1764 MNT_REL(mp); 1765} 1766 1767int 1768__vfs_statfs(struct mount *mp, struct statfs *sbp) 1769{ 1770 int error; 1771 1772 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1773 if (sbp != &mp->mnt_stat) 1774 *sbp = mp->mnt_stat; 1775 return (error); 1776} 1777 1778void 1779vfs_mountedfrom(struct mount *mp, const char *from) 1780{ 1781 1782 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1783 strlcpy(mp->mnt_stat.f_mntfromname, from, 1784 sizeof mp->mnt_stat.f_mntfromname); 1785} 1786 1787/* 1788 * --------------------------------------------------------------------- 1789 * This is the api for building mount args and mounting filesystems from 1790 * inside the kernel. 1791 * 1792 * The API works by accumulation of individual args. First error is 1793 * latched. 1794 * 1795 * XXX: should be documented in new manpage kernel_mount(9) 1796 */ 1797 1798/* A memory allocation which must be freed when we are done */ 1799struct mntaarg { 1800 SLIST_ENTRY(mntaarg) next; 1801}; 1802 1803/* The header for the mount arguments */ 1804struct mntarg { 1805 struct iovec *v; 1806 int len; 1807 int error; 1808 SLIST_HEAD(, mntaarg) list; 1809}; 1810 1811/* 1812 * Add a boolean argument. 1813 * 1814 * flag is the boolean value. 1815 * name must start with "no". 1816 */ 1817struct mntarg * 1818mount_argb(struct mntarg *ma, int flag, const char *name) 1819{ 1820 1821 KASSERT(name[0] == 'n' && name[1] == 'o', 1822 ("mount_argb(...,%s): name must start with 'no'", name)); 1823 1824 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1825} 1826 1827/* 1828 * Add an argument printf style 1829 */ 1830struct mntarg * 1831mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1832{ 1833 va_list ap; 1834 struct mntaarg *maa; 1835 struct sbuf *sb; 1836 int len; 1837 1838 if (ma == NULL) { 1839 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1840 SLIST_INIT(&ma->list); 1841 } 1842 if (ma->error) 1843 return (ma); 1844 1845 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1846 M_MOUNT, M_WAITOK); 1847 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1848 ma->v[ma->len].iov_len = strlen(name) + 1; 1849 ma->len++; 1850 1851 sb = sbuf_new_auto(); 1852 va_start(ap, fmt); 1853 sbuf_vprintf(sb, fmt, ap); 1854 va_end(ap); 1855 sbuf_finish(sb); 1856 len = sbuf_len(sb) + 1; 1857 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1858 SLIST_INSERT_HEAD(&ma->list, maa, next); 1859 bcopy(sbuf_data(sb), maa + 1, len); 1860 sbuf_delete(sb); 1861 1862 ma->v[ma->len].iov_base = maa + 1; 1863 ma->v[ma->len].iov_len = len; 1864 ma->len++; 1865 1866 return (ma); 1867} 1868 1869/* 1870 * Add an argument which is a userland string. 1871 */ 1872struct mntarg * 1873mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1874{ 1875 struct mntaarg *maa; 1876 char *tbuf; 1877 1878 if (val == NULL) 1879 return (ma); 1880 if (ma == NULL) { 1881 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1882 SLIST_INIT(&ma->list); 1883 } 1884 if (ma->error) 1885 return (ma); 1886 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1887 SLIST_INSERT_HEAD(&ma->list, maa, next); 1888 tbuf = (void *)(maa + 1); 1889 ma->error = copyinstr(val, tbuf, len, NULL); 1890 return (mount_arg(ma, name, tbuf, -1)); 1891} 1892 1893/* 1894 * Plain argument. 1895 * 1896 * If length is -1, treat value as a C string. 1897 */ 1898struct mntarg * 1899mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1900{ 1901 1902 if (ma == NULL) { 1903 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1904 SLIST_INIT(&ma->list); 1905 } 1906 if (ma->error) 1907 return (ma); 1908 1909 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1910 M_MOUNT, M_WAITOK); 1911 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1912 ma->v[ma->len].iov_len = strlen(name) + 1; 1913 ma->len++; 1914 1915 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1916 if (len < 0) 1917 ma->v[ma->len].iov_len = strlen(val) + 1; 1918 else 1919 ma->v[ma->len].iov_len = len; 1920 ma->len++; 1921 return (ma); 1922} 1923 1924/* 1925 * Free a mntarg structure 1926 */ 1927static void 1928free_mntarg(struct mntarg *ma) 1929{ 1930 struct mntaarg *maa; 1931 1932 while (!SLIST_EMPTY(&ma->list)) { 1933 maa = SLIST_FIRST(&ma->list); 1934 SLIST_REMOVE_HEAD(&ma->list, next); 1935 free(maa, M_MOUNT); 1936 } 1937 free(ma->v, M_MOUNT); 1938 free(ma, M_MOUNT); 1939} 1940 1941/* 1942 * Mount a filesystem 1943 */ 1944int 1945kernel_mount(struct mntarg *ma, uint64_t flags) 1946{ 1947 struct uio auio; 1948 int error; 1949 1950 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1951 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1952 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1953 1954 auio.uio_iov = ma->v; 1955 auio.uio_iovcnt = ma->len; 1956 auio.uio_segflg = UIO_SYSSPACE; 1957 1958 error = ma->error; 1959 if (!error) 1960 error = vfs_donmount(curthread, flags, &auio); 1961 free_mntarg(ma); 1962 return (error); 1963} 1964 1965/* 1966 * A printflike function to mount a filesystem. 1967 */ 1968int 1969kernel_vmount(int flags, ...) 1970{ 1971 struct mntarg *ma = NULL; 1972 va_list ap; 1973 const char *cp; 1974 const void *vp; 1975 int error; 1976 1977 va_start(ap, flags); 1978 for (;;) { 1979 cp = va_arg(ap, const char *); 1980 if (cp == NULL) 1981 break; 1982 vp = va_arg(ap, const void *); 1983 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1984 } 1985 va_end(ap); 1986 1987 error = kernel_mount(ma, flags); 1988 return (error); 1989} 1990 1991void 1992vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1993{ 1994 1995 bcopy(oexp, exp, sizeof(*oexp)); 1996 exp->ex_numsecflavors = 0; 1997} 1998