vfs_mount.c revision 244324
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 244324 2012-12-16 23:41:34Z pjd $"); 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 return (mp); 483} 484 485/* 486 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 487 */ 488void 489vfs_mount_destroy(struct mount *mp) 490{ 491 492 MNT_ILOCK(mp); 493 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 494 if (mp->mnt_kern_flag & MNTK_MWAIT) { 495 mp->mnt_kern_flag &= ~MNTK_MWAIT; 496 wakeup(mp); 497 } 498 while (mp->mnt_ref) 499 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 500 KASSERT(mp->mnt_ref == 0, 501 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 502 __FILE__, __LINE__)); 503 if (mp->mnt_writeopcount != 0) 504 panic("vfs_mount_destroy: nonzero writeopcount"); 505 if (mp->mnt_secondary_writes != 0) 506 panic("vfs_mount_destroy: nonzero secondary_writes"); 507 mp->mnt_vfc->vfc_refcount--; 508 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 509 struct vnode *vp; 510 511 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 512 vprint("", vp); 513 panic("unmount: dangling vnode"); 514 } 515 if (mp->mnt_nvnodelistsize != 0) 516 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 517 if (mp->mnt_activevnodelistsize != 0) 518 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 519 if (mp->mnt_lockref != 0) 520 panic("vfs_mount_destroy: nonzero lock refcount"); 521 MNT_IUNLOCK(mp); 522#ifdef MAC 523 mac_mount_destroy(mp); 524#endif 525 if (mp->mnt_opt != NULL) 526 vfs_freeopts(mp->mnt_opt); 527 crfree(mp->mnt_cred); 528 uma_zfree(mount_zone, mp); 529} 530 531int 532vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 533{ 534 struct vfsoptlist *optlist; 535 struct vfsopt *opt, *tmp_opt; 536 char *fstype, *fspath, *errmsg; 537 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 538 539 errmsg = fspath = NULL; 540 errmsg_len = fspathlen = 0; 541 errmsg_pos = -1; 542 543 error = vfs_buildopts(fsoptions, &optlist); 544 if (error) 545 return (error); 546 547 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 548 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 549 550 /* 551 * We need these two options before the others, 552 * and they are mandatory for any filesystem. 553 * Ensure they are NUL terminated as well. 554 */ 555 fstypelen = 0; 556 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 557 if (error || fstype[fstypelen - 1] != '\0') { 558 error = EINVAL; 559 if (errmsg != NULL) 560 strncpy(errmsg, "Invalid fstype", errmsg_len); 561 goto bail; 562 } 563 fspathlen = 0; 564 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 565 if (error || fspath[fspathlen - 1] != '\0') { 566 error = EINVAL; 567 if (errmsg != NULL) 568 strncpy(errmsg, "Invalid fspath", errmsg_len); 569 goto bail; 570 } 571 572 /* 573 * We need to see if we have the "update" option 574 * before we call vfs_domount(), since vfs_domount() has special 575 * logic based on MNT_UPDATE. This is very important 576 * when we want to update the root filesystem. 577 */ 578 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 579 if (strcmp(opt->name, "update") == 0) { 580 fsflags |= MNT_UPDATE; 581 vfs_freeopt(optlist, opt); 582 } 583 else if (strcmp(opt->name, "async") == 0) 584 fsflags |= MNT_ASYNC; 585 else if (strcmp(opt->name, "force") == 0) { 586 fsflags |= MNT_FORCE; 587 vfs_freeopt(optlist, opt); 588 } 589 else if (strcmp(opt->name, "reload") == 0) { 590 fsflags |= MNT_RELOAD; 591 vfs_freeopt(optlist, opt); 592 } 593 else if (strcmp(opt->name, "multilabel") == 0) 594 fsflags |= MNT_MULTILABEL; 595 else if (strcmp(opt->name, "noasync") == 0) 596 fsflags &= ~MNT_ASYNC; 597 else if (strcmp(opt->name, "noatime") == 0) 598 fsflags |= MNT_NOATIME; 599 else if (strcmp(opt->name, "atime") == 0) { 600 free(opt->name, M_MOUNT); 601 opt->name = strdup("nonoatime", M_MOUNT); 602 } 603 else if (strcmp(opt->name, "noclusterr") == 0) 604 fsflags |= MNT_NOCLUSTERR; 605 else if (strcmp(opt->name, "clusterr") == 0) { 606 free(opt->name, M_MOUNT); 607 opt->name = strdup("nonoclusterr", M_MOUNT); 608 } 609 else if (strcmp(opt->name, "noclusterw") == 0) 610 fsflags |= MNT_NOCLUSTERW; 611 else if (strcmp(opt->name, "clusterw") == 0) { 612 free(opt->name, M_MOUNT); 613 opt->name = strdup("nonoclusterw", M_MOUNT); 614 } 615 else if (strcmp(opt->name, "noexec") == 0) 616 fsflags |= MNT_NOEXEC; 617 else if (strcmp(opt->name, "exec") == 0) { 618 free(opt->name, M_MOUNT); 619 opt->name = strdup("nonoexec", M_MOUNT); 620 } 621 else if (strcmp(opt->name, "nosuid") == 0) 622 fsflags |= MNT_NOSUID; 623 else if (strcmp(opt->name, "suid") == 0) { 624 free(opt->name, M_MOUNT); 625 opt->name = strdup("nonosuid", M_MOUNT); 626 } 627 else if (strcmp(opt->name, "nosymfollow") == 0) 628 fsflags |= MNT_NOSYMFOLLOW; 629 else if (strcmp(opt->name, "symfollow") == 0) { 630 free(opt->name, M_MOUNT); 631 opt->name = strdup("nonosymfollow", M_MOUNT); 632 } 633 else if (strcmp(opt->name, "noro") == 0) 634 fsflags &= ~MNT_RDONLY; 635 else if (strcmp(opt->name, "rw") == 0) 636 fsflags &= ~MNT_RDONLY; 637 else if (strcmp(opt->name, "ro") == 0) 638 fsflags |= MNT_RDONLY; 639 else if (strcmp(opt->name, "rdonly") == 0) { 640 free(opt->name, M_MOUNT); 641 opt->name = strdup("ro", M_MOUNT); 642 fsflags |= MNT_RDONLY; 643 } 644 else if (strcmp(opt->name, "suiddir") == 0) 645 fsflags |= MNT_SUIDDIR; 646 else if (strcmp(opt->name, "sync") == 0) 647 fsflags |= MNT_SYNCHRONOUS; 648 else if (strcmp(opt->name, "union") == 0) 649 fsflags |= MNT_UNION; 650 } 651 652 /* 653 * Be ultra-paranoid about making sure the type and fspath 654 * variables will fit in our mp buffers, including the 655 * terminating NUL. 656 */ 657 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 658 error = ENAMETOOLONG; 659 goto bail; 660 } 661 662 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 663bail: 664 /* copyout the errmsg */ 665 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 666 && errmsg_len > 0 && errmsg != NULL) { 667 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 668 bcopy(errmsg, 669 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 670 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 671 } else { 672 copyout(errmsg, 673 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 674 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 675 } 676 } 677 678 if (optlist != NULL) 679 vfs_freeopts(optlist); 680 return (error); 681} 682 683/* 684 * Old mount API. 685 */ 686#ifndef _SYS_SYSPROTO_H_ 687struct mount_args { 688 char *type; 689 char *path; 690 int flags; 691 caddr_t data; 692}; 693#endif 694/* ARGSUSED */ 695int 696sys_mount(td, uap) 697 struct thread *td; 698 struct mount_args /* { 699 char *type; 700 char *path; 701 int flags; 702 caddr_t data; 703 } */ *uap; 704{ 705 char *fstype; 706 struct vfsconf *vfsp = NULL; 707 struct mntarg *ma = NULL; 708 uint64_t flags; 709 int error; 710 711 /* 712 * Mount flags are now 64-bits. On 32-bit architectures only 713 * 32-bits are passed in, but from here on everything handles 714 * 64-bit flags correctly. 715 */ 716 flags = uap->flags; 717 718 AUDIT_ARG_FFLAGS(flags); 719 720 /* 721 * Filter out MNT_ROOTFS. We do not want clients of mount() in 722 * userspace to set this flag, but we must filter it out if we want 723 * MNT_UPDATE on the root file system to work. 724 * MNT_ROOTFS should only be set by the kernel when mounting its 725 * root file system. 726 */ 727 flags &= ~MNT_ROOTFS; 728 729 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 730 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 731 if (error) { 732 free(fstype, M_TEMP); 733 return (error); 734 } 735 736 AUDIT_ARG_TEXT(fstype); 737 mtx_lock(&Giant); 738 vfsp = vfs_byname_kld(fstype, td, &error); 739 free(fstype, M_TEMP); 740 if (vfsp == NULL) { 741 mtx_unlock(&Giant); 742 return (ENOENT); 743 } 744 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 745 mtx_unlock(&Giant); 746 return (EOPNOTSUPP); 747 } 748 749 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 750 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 751 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 752 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 753 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 754 755 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 756 mtx_unlock(&Giant); 757 return (error); 758} 759 760/* 761 * vfs_domount_first(): first file system mount (not update) 762 */ 763static int 764vfs_domount_first( 765 struct thread *td, /* Calling thread. */ 766 struct vfsconf *vfsp, /* File system type. */ 767 char *fspath, /* Mount path. */ 768 struct vnode *vp, /* Vnode to be covered. */ 769 uint64_t fsflags, /* Flags common to all filesystems. */ 770 struct vfsoptlist **optlist /* Options local to the filesystem. */ 771 ) 772{ 773 struct vattr va; 774 struct mount *mp; 775 struct vnode *newdp; 776 int error; 777 778 mtx_assert(&Giant, MA_OWNED); 779 ASSERT_VOP_ELOCKED(vp, __func__); 780 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 781 782 /* 783 * If the user is not root, ensure that they own the directory 784 * onto which we are attempting to mount. 785 */ 786 error = VOP_GETATTR(vp, &va, td->td_ucred); 787 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 788 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 789 if (error == 0) 790 error = vinvalbuf(vp, V_SAVE, 0, 0); 791 if (error == 0 && vp->v_type != VDIR) 792 error = ENOTDIR; 793 if (error == 0) { 794 VI_LOCK(vp); 795 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 796 vp->v_iflag |= VI_MOUNT; 797 else 798 error = EBUSY; 799 VI_UNLOCK(vp); 800 } 801 if (error != 0) { 802 vput(vp); 803 return (error); 804 } 805 VOP_UNLOCK(vp, 0); 806 807 /* Allocate and initialize the filesystem. */ 808 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 809 /* XXXMAC: pass to vfs_mount_alloc? */ 810 mp->mnt_optnew = *optlist; 811 /* Set the mount level flags. */ 812 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 813 814 /* 815 * Mount the filesystem. 816 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 817 * get. No freeing of cn_pnbuf. 818 */ 819 error = VFS_MOUNT(mp); 820 if (error != 0) { 821 vfs_unbusy(mp); 822 vfs_mount_destroy(mp); 823 VI_LOCK(vp); 824 vp->v_iflag &= ~VI_MOUNT; 825 VI_UNLOCK(vp); 826 vrele(vp); 827 return (error); 828 } 829 830 if (mp->mnt_opt != NULL) 831 vfs_freeopts(mp->mnt_opt); 832 mp->mnt_opt = mp->mnt_optnew; 833 *optlist = NULL; 834 (void)VFS_STATFS(mp, &mp->mnt_stat); 835 836 /* 837 * Prevent external consumers of mount options from reading mnt_optnew. 838 */ 839 mp->mnt_optnew = NULL; 840 841 MNT_ILOCK(mp); 842 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 843 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 844 mp->mnt_kern_flag |= MNTK_ASYNC; 845 else 846 mp->mnt_kern_flag &= ~MNTK_ASYNC; 847 MNT_IUNLOCK(mp); 848 849 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 850 cache_purge(vp); 851 VI_LOCK(vp); 852 vp->v_iflag &= ~VI_MOUNT; 853 VI_UNLOCK(vp); 854 vp->v_mountedhere = mp; 855 /* Place the new filesystem at the end of the mount list. */ 856 mtx_lock(&mountlist_mtx); 857 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 858 mtx_unlock(&mountlist_mtx); 859 vfs_event_signal(NULL, VQ_MOUNT, 0); 860 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 861 panic("mount: lost mount"); 862 VOP_UNLOCK(newdp, 0); 863 VOP_UNLOCK(vp, 0); 864 mountcheckdirs(vp, newdp); 865 vrele(newdp); 866 if ((mp->mnt_flag & MNT_RDONLY) == 0) 867 vfs_allocate_syncvnode(mp); 868 vfs_unbusy(mp); 869 return (0); 870} 871 872/* 873 * vfs_domount_update(): update of mounted file system 874 */ 875static int 876vfs_domount_update( 877 struct thread *td, /* Calling thread. */ 878 struct vnode *vp, /* Mount point vnode. */ 879 uint64_t fsflags, /* Flags common to all filesystems. */ 880 struct vfsoptlist **optlist /* Options local to the filesystem. */ 881 ) 882{ 883 struct oexport_args oexport; 884 struct export_args export; 885 struct mount *mp; 886 int error, export_error; 887 uint64_t flag; 888 889 mtx_assert(&Giant, MA_OWNED); 890 ASSERT_VOP_ELOCKED(vp, __func__); 891 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 892 893 if ((vp->v_vflag & VV_ROOT) == 0) { 894 vput(vp); 895 return (EINVAL); 896 } 897 mp = vp->v_mount; 898 /* 899 * We only allow the filesystem to be reloaded if it 900 * is currently mounted read-only. 901 */ 902 flag = mp->mnt_flag; 903 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 904 vput(vp); 905 return (EOPNOTSUPP); /* Needs translation */ 906 } 907 /* 908 * Only privileged root, or (if MNT_USER is set) the user that 909 * did the original mount is permitted to update it. 910 */ 911 error = vfs_suser(mp, td); 912 if (error != 0) { 913 vput(vp); 914 return (error); 915 } 916 if (vfs_busy(mp, MBF_NOWAIT)) { 917 vput(vp); 918 return (EBUSY); 919 } 920 VI_LOCK(vp); 921 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 922 VI_UNLOCK(vp); 923 vfs_unbusy(mp); 924 vput(vp); 925 return (EBUSY); 926 } 927 vp->v_iflag |= VI_MOUNT; 928 VI_UNLOCK(vp); 929 VOP_UNLOCK(vp, 0); 930 931 MNT_ILOCK(mp); 932 mp->mnt_flag &= ~MNT_UPDATEMASK; 933 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 934 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 935 if ((mp->mnt_flag & MNT_ASYNC) == 0) 936 mp->mnt_kern_flag &= ~MNTK_ASYNC; 937 MNT_IUNLOCK(mp); 938 mp->mnt_optnew = *optlist; 939 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 940 941 /* 942 * Mount the filesystem. 943 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 944 * get. No freeing of cn_pnbuf. 945 */ 946 error = VFS_MOUNT(mp); 947 948 export_error = 0; 949 if (error == 0) { 950 /* Process the export option. */ 951 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 952 sizeof(export)) == 0) { 953 export_error = vfs_export(mp, &export); 954 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 955 sizeof(oexport)) == 0) { 956 export.ex_flags = oexport.ex_flags; 957 export.ex_root = oexport.ex_root; 958 export.ex_anon = oexport.ex_anon; 959 export.ex_addr = oexport.ex_addr; 960 export.ex_addrlen = oexport.ex_addrlen; 961 export.ex_mask = oexport.ex_mask; 962 export.ex_masklen = oexport.ex_masklen; 963 export.ex_indexfile = oexport.ex_indexfile; 964 export.ex_numsecflavors = 0; 965 export_error = vfs_export(mp, &export); 966 } 967 } 968 969 MNT_ILOCK(mp); 970 if (error == 0) { 971 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 972 MNT_SNAPSHOT); 973 } else { 974 /* 975 * If we fail, restore old mount flags. MNT_QUOTA is special, 976 * because it is not part of MNT_UPDATEMASK, but it could have 977 * changed in the meantime if quotactl(2) was called. 978 * All in all we want current value of MNT_QUOTA, not the old 979 * one. 980 */ 981 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 982 } 983 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 984 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 985 mp->mnt_kern_flag |= MNTK_ASYNC; 986 else 987 mp->mnt_kern_flag &= ~MNTK_ASYNC; 988 MNT_IUNLOCK(mp); 989 990 if (error != 0) 991 goto end; 992 993 if (mp->mnt_opt != NULL) 994 vfs_freeopts(mp->mnt_opt); 995 mp->mnt_opt = mp->mnt_optnew; 996 *optlist = NULL; 997 (void)VFS_STATFS(mp, &mp->mnt_stat); 998 /* 999 * Prevent external consumers of mount options from reading 1000 * mnt_optnew. 1001 */ 1002 mp->mnt_optnew = NULL; 1003 1004 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1005 vfs_allocate_syncvnode(mp); 1006 else 1007 vfs_deallocate_syncvnode(mp); 1008end: 1009 vfs_unbusy(mp); 1010 VI_LOCK(vp); 1011 vp->v_iflag &= ~VI_MOUNT; 1012 VI_UNLOCK(vp); 1013 vrele(vp); 1014 return (error != 0 ? error : export_error); 1015} 1016 1017/* 1018 * vfs_domount(): actually attempt a filesystem mount. 1019 */ 1020static int 1021vfs_domount( 1022 struct thread *td, /* Calling thread. */ 1023 const char *fstype, /* Filesystem type. */ 1024 char *fspath, /* Mount path. */ 1025 uint64_t fsflags, /* Flags common to all filesystems. */ 1026 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1027 ) 1028{ 1029 struct vfsconf *vfsp; 1030 struct nameidata nd; 1031 struct vnode *vp; 1032 char *pathbuf; 1033 int error; 1034 1035 /* 1036 * Be ultra-paranoid about making sure the type and fspath 1037 * variables will fit in our mp buffers, including the 1038 * terminating NUL. 1039 */ 1040 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1041 return (ENAMETOOLONG); 1042 1043 if (jailed(td->td_ucred) || usermount == 0) { 1044 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1045 return (error); 1046 } 1047 1048 /* 1049 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1050 */ 1051 if (fsflags & MNT_EXPORTED) { 1052 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1053 if (error) 1054 return (error); 1055 } 1056 if (fsflags & MNT_SUIDDIR) { 1057 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1058 if (error) 1059 return (error); 1060 } 1061 /* 1062 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1063 */ 1064 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1065 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1066 fsflags |= MNT_NOSUID | MNT_USER; 1067 } 1068 1069 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1070 vfsp = NULL; 1071 if ((fsflags & MNT_UPDATE) == 0) { 1072 /* Don't try to load KLDs if we're mounting the root. */ 1073 if (fsflags & MNT_ROOTFS) 1074 vfsp = vfs_byname(fstype); 1075 else 1076 vfsp = vfs_byname_kld(fstype, td, &error); 1077 if (vfsp == NULL) 1078 return (ENODEV); 1079 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1080 return (EPERM); 1081 } 1082 1083 /* 1084 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1085 */ 1086 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1087 UIO_SYSSPACE, fspath, td); 1088 error = namei(&nd); 1089 if (error != 0) 1090 return (error); 1091 if (!NDHASGIANT(&nd)) 1092 mtx_lock(&Giant); 1093 NDFREE(&nd, NDF_ONLY_PNBUF); 1094 vp = nd.ni_vp; 1095 if ((fsflags & MNT_UPDATE) == 0) { 1096 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1097 strcpy(pathbuf, fspath); 1098 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1099 /* debug.disablefullpath == 1 results in ENODEV */ 1100 if (error == 0 || error == ENODEV) { 1101 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1102 fsflags, optlist); 1103 } 1104 free(pathbuf, M_TEMP); 1105 } else 1106 error = vfs_domount_update(td, vp, fsflags, optlist); 1107 mtx_unlock(&Giant); 1108 1109 ASSERT_VI_UNLOCKED(vp, __func__); 1110 ASSERT_VOP_UNLOCKED(vp, __func__); 1111 1112 return (error); 1113} 1114 1115/* 1116 * Unmount a filesystem. 1117 * 1118 * Note: unmount takes a path to the vnode mounted on as argument, not 1119 * special file (as before). 1120 */ 1121#ifndef _SYS_SYSPROTO_H_ 1122struct unmount_args { 1123 char *path; 1124 int flags; 1125}; 1126#endif 1127/* ARGSUSED */ 1128int 1129sys_unmount(td, uap) 1130 struct thread *td; 1131 register struct unmount_args /* { 1132 char *path; 1133 int flags; 1134 } */ *uap; 1135{ 1136 struct nameidata nd; 1137 struct mount *mp; 1138 char *pathbuf; 1139 int error, id0, id1, vfslocked; 1140 1141 AUDIT_ARG_VALUE(uap->flags); 1142 if (jailed(td->td_ucred) || usermount == 0) { 1143 error = priv_check(td, PRIV_VFS_UNMOUNT); 1144 if (error) 1145 return (error); 1146 } 1147 1148 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1149 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1150 if (error) { 1151 free(pathbuf, M_TEMP); 1152 return (error); 1153 } 1154 mtx_lock(&Giant); 1155 if (uap->flags & MNT_BYFSID) { 1156 AUDIT_ARG_TEXT(pathbuf); 1157 /* Decode the filesystem ID. */ 1158 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1159 mtx_unlock(&Giant); 1160 free(pathbuf, M_TEMP); 1161 return (EINVAL); 1162 } 1163 1164 mtx_lock(&mountlist_mtx); 1165 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1166 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1167 mp->mnt_stat.f_fsid.val[1] == id1) 1168 break; 1169 } 1170 mtx_unlock(&mountlist_mtx); 1171 } else { 1172 /* 1173 * Try to find global path for path argument. 1174 */ 1175 NDINIT(&nd, LOOKUP, 1176 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1177 UIO_SYSSPACE, pathbuf, td); 1178 if (namei(&nd) == 0) { 1179 vfslocked = NDHASGIANT(&nd); 1180 NDFREE(&nd, NDF_ONLY_PNBUF); 1181 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1182 MNAMELEN); 1183 if (error == 0 || error == ENODEV) 1184 vput(nd.ni_vp); 1185 VFS_UNLOCK_GIANT(vfslocked); 1186 } 1187 mtx_lock(&mountlist_mtx); 1188 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1189 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1190 break; 1191 } 1192 mtx_unlock(&mountlist_mtx); 1193 } 1194 free(pathbuf, M_TEMP); 1195 if (mp == NULL) { 1196 /* 1197 * Previously we returned ENOENT for a nonexistent path and 1198 * EINVAL for a non-mountpoint. We cannot tell these apart 1199 * now, so in the !MNT_BYFSID case return the more likely 1200 * EINVAL for compatibility. 1201 */ 1202 mtx_unlock(&Giant); 1203 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1204 } 1205 1206 /* 1207 * Don't allow unmounting the root filesystem. 1208 */ 1209 if (mp->mnt_flag & MNT_ROOTFS) { 1210 mtx_unlock(&Giant); 1211 return (EINVAL); 1212 } 1213 error = dounmount(mp, uap->flags, td); 1214 mtx_unlock(&Giant); 1215 return (error); 1216} 1217 1218/* 1219 * Do the actual filesystem unmount. 1220 */ 1221int 1222dounmount(mp, flags, td) 1223 struct mount *mp; 1224 int flags; 1225 struct thread *td; 1226{ 1227 struct vnode *coveredvp, *fsrootvp; 1228 int error; 1229 uint64_t async_flag; 1230 int mnt_gen_r; 1231 1232 mtx_assert(&Giant, MA_OWNED); 1233 1234 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1235 mnt_gen_r = mp->mnt_gen; 1236 VI_LOCK(coveredvp); 1237 vholdl(coveredvp); 1238 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1239 vdrop(coveredvp); 1240 /* 1241 * Check for mp being unmounted while waiting for the 1242 * covered vnode lock. 1243 */ 1244 if (coveredvp->v_mountedhere != mp || 1245 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1246 VOP_UNLOCK(coveredvp, 0); 1247 return (EBUSY); 1248 } 1249 } 1250 /* 1251 * Only privileged root, or (if MNT_USER is set) the user that did the 1252 * original mount is permitted to unmount this filesystem. 1253 */ 1254 error = vfs_suser(mp, td); 1255 if (error) { 1256 if (coveredvp) 1257 VOP_UNLOCK(coveredvp, 0); 1258 return (error); 1259 } 1260 1261 MNT_ILOCK(mp); 1262 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1263 MNT_IUNLOCK(mp); 1264 if (coveredvp) 1265 VOP_UNLOCK(coveredvp, 0); 1266 return (EBUSY); 1267 } 1268 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1269 /* Allow filesystems to detect that a forced unmount is in progress. */ 1270 if (flags & MNT_FORCE) 1271 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1272 error = 0; 1273 if (mp->mnt_lockref) { 1274 mp->mnt_kern_flag |= MNTK_DRAINING; 1275 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1276 "mount drain", 0); 1277 } 1278 MNT_IUNLOCK(mp); 1279 KASSERT(mp->mnt_lockref == 0, 1280 ("%s: invalid lock refcount in the drain path @ %s:%d", 1281 __func__, __FILE__, __LINE__)); 1282 KASSERT(error == 0, 1283 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1284 __func__, __FILE__, __LINE__)); 1285 vn_start_write(NULL, &mp, V_WAIT); 1286 1287 if (mp->mnt_flag & MNT_EXPUBLIC) 1288 vfs_setpublicfs(NULL, NULL, NULL); 1289 1290 vfs_msync(mp, MNT_WAIT); 1291 MNT_ILOCK(mp); 1292 async_flag = mp->mnt_flag & MNT_ASYNC; 1293 mp->mnt_flag &= ~MNT_ASYNC; 1294 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1295 MNT_IUNLOCK(mp); 1296 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1297 vfs_deallocate_syncvnode(mp); 1298 /* 1299 * For forced unmounts, move process cdir/rdir refs on the fs root 1300 * vnode to the covered vnode. For non-forced unmounts we want 1301 * such references to cause an EBUSY error. 1302 */ 1303 if ((flags & MNT_FORCE) && 1304 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1305 if (mp->mnt_vnodecovered != NULL) 1306 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1307 if (fsrootvp == rootvnode) { 1308 vrele(rootvnode); 1309 rootvnode = NULL; 1310 } 1311 vput(fsrootvp); 1312 } 1313 if (((mp->mnt_flag & MNT_RDONLY) || 1314 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1315 error = VFS_UNMOUNT(mp, flags); 1316 vn_finished_write(mp); 1317 /* 1318 * If we failed to flush the dirty blocks for this mount point, 1319 * undo all the cdir/rdir and rootvnode changes we made above. 1320 * Unless we failed to do so because the device is reporting that 1321 * it doesn't exist anymore. 1322 */ 1323 if (error && error != ENXIO) { 1324 if ((flags & MNT_FORCE) && 1325 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1326 if (mp->mnt_vnodecovered != NULL) 1327 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1328 if (rootvnode == NULL) { 1329 rootvnode = fsrootvp; 1330 vref(rootvnode); 1331 } 1332 vput(fsrootvp); 1333 } 1334 MNT_ILOCK(mp); 1335 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1336 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1337 MNT_IUNLOCK(mp); 1338 vfs_allocate_syncvnode(mp); 1339 MNT_ILOCK(mp); 1340 } 1341 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1342 mp->mnt_flag |= async_flag; 1343 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1344 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1345 mp->mnt_kern_flag |= MNTK_ASYNC; 1346 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1347 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1348 wakeup(mp); 1349 } 1350 MNT_IUNLOCK(mp); 1351 if (coveredvp) 1352 VOP_UNLOCK(coveredvp, 0); 1353 return (error); 1354 } 1355 mtx_lock(&mountlist_mtx); 1356 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1357 mtx_unlock(&mountlist_mtx); 1358 if (coveredvp != NULL) { 1359 coveredvp->v_mountedhere = NULL; 1360 vput(coveredvp); 1361 } 1362 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1363 vfs_mount_destroy(mp); 1364 return (0); 1365} 1366 1367/* 1368 * Report errors during filesystem mounting. 1369 */ 1370void 1371vfs_mount_error(struct mount *mp, const char *fmt, ...) 1372{ 1373 struct vfsoptlist *moptlist = mp->mnt_optnew; 1374 va_list ap; 1375 int error, len; 1376 char *errmsg; 1377 1378 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1379 if (error || errmsg == NULL || len <= 0) 1380 return; 1381 1382 va_start(ap, fmt); 1383 vsnprintf(errmsg, (size_t)len, fmt, ap); 1384 va_end(ap); 1385} 1386 1387void 1388vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1389{ 1390 va_list ap; 1391 int error, len; 1392 char *errmsg; 1393 1394 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1395 if (error || errmsg == NULL || len <= 0) 1396 return; 1397 1398 va_start(ap, fmt); 1399 vsnprintf(errmsg, (size_t)len, fmt, ap); 1400 va_end(ap); 1401} 1402 1403/* 1404 * --------------------------------------------------------------------- 1405 * Functions for querying mount options/arguments from filesystems. 1406 */ 1407 1408/* 1409 * Check that no unknown options are given 1410 */ 1411int 1412vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1413{ 1414 struct vfsopt *opt; 1415 char errmsg[255]; 1416 const char **t, *p, *q; 1417 int ret = 0; 1418 1419 TAILQ_FOREACH(opt, opts, link) { 1420 p = opt->name; 1421 q = NULL; 1422 if (p[0] == 'n' && p[1] == 'o') 1423 q = p + 2; 1424 for(t = global_opts; *t != NULL; t++) { 1425 if (strcmp(*t, p) == 0) 1426 break; 1427 if (q != NULL) { 1428 if (strcmp(*t, q) == 0) 1429 break; 1430 } 1431 } 1432 if (*t != NULL) 1433 continue; 1434 for(t = legal; *t != NULL; t++) { 1435 if (strcmp(*t, p) == 0) 1436 break; 1437 if (q != NULL) { 1438 if (strcmp(*t, q) == 0) 1439 break; 1440 } 1441 } 1442 if (*t != NULL) 1443 continue; 1444 snprintf(errmsg, sizeof(errmsg), 1445 "mount option <%s> is unknown", p); 1446 ret = EINVAL; 1447 } 1448 if (ret != 0) { 1449 TAILQ_FOREACH(opt, opts, link) { 1450 if (strcmp(opt->name, "errmsg") == 0) { 1451 strncpy((char *)opt->value, errmsg, opt->len); 1452 break; 1453 } 1454 } 1455 if (opt == NULL) 1456 printf("%s\n", errmsg); 1457 } 1458 return (ret); 1459} 1460 1461/* 1462 * Get a mount option by its name. 1463 * 1464 * Return 0 if the option was found, ENOENT otherwise. 1465 * If len is non-NULL it will be filled with the length 1466 * of the option. If buf is non-NULL, it will be filled 1467 * with the address of the option. 1468 */ 1469int 1470vfs_getopt(opts, name, buf, len) 1471 struct vfsoptlist *opts; 1472 const char *name; 1473 void **buf; 1474 int *len; 1475{ 1476 struct vfsopt *opt; 1477 1478 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1479 1480 TAILQ_FOREACH(opt, opts, link) { 1481 if (strcmp(name, opt->name) == 0) { 1482 opt->seen = 1; 1483 if (len != NULL) 1484 *len = opt->len; 1485 if (buf != NULL) 1486 *buf = opt->value; 1487 return (0); 1488 } 1489 } 1490 return (ENOENT); 1491} 1492 1493int 1494vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1495{ 1496 struct vfsopt *opt; 1497 1498 if (opts == NULL) 1499 return (-1); 1500 1501 TAILQ_FOREACH(opt, opts, link) { 1502 if (strcmp(name, opt->name) == 0) { 1503 opt->seen = 1; 1504 return (opt->pos); 1505 } 1506 } 1507 return (-1); 1508} 1509 1510char * 1511vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1512{ 1513 struct vfsopt *opt; 1514 1515 *error = 0; 1516 TAILQ_FOREACH(opt, opts, link) { 1517 if (strcmp(name, opt->name) != 0) 1518 continue; 1519 opt->seen = 1; 1520 if (opt->len == 0 || 1521 ((char *)opt->value)[opt->len - 1] != '\0') { 1522 *error = EINVAL; 1523 return (NULL); 1524 } 1525 return (opt->value); 1526 } 1527 *error = ENOENT; 1528 return (NULL); 1529} 1530 1531int 1532vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1533 uint64_t val) 1534{ 1535 struct vfsopt *opt; 1536 1537 TAILQ_FOREACH(opt, opts, link) { 1538 if (strcmp(name, opt->name) == 0) { 1539 opt->seen = 1; 1540 if (w != NULL) 1541 *w |= val; 1542 return (1); 1543 } 1544 } 1545 if (w != NULL) 1546 *w &= ~val; 1547 return (0); 1548} 1549 1550int 1551vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1552{ 1553 va_list ap; 1554 struct vfsopt *opt; 1555 int ret; 1556 1557 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1558 1559 TAILQ_FOREACH(opt, opts, link) { 1560 if (strcmp(name, opt->name) != 0) 1561 continue; 1562 opt->seen = 1; 1563 if (opt->len == 0 || opt->value == NULL) 1564 return (0); 1565 if (((char *)opt->value)[opt->len - 1] != '\0') 1566 return (0); 1567 va_start(ap, fmt); 1568 ret = vsscanf(opt->value, fmt, ap); 1569 va_end(ap); 1570 return (ret); 1571 } 1572 return (0); 1573} 1574 1575int 1576vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1577{ 1578 struct vfsopt *opt; 1579 1580 TAILQ_FOREACH(opt, opts, link) { 1581 if (strcmp(name, opt->name) != 0) 1582 continue; 1583 opt->seen = 1; 1584 if (opt->value == NULL) 1585 opt->len = len; 1586 else { 1587 if (opt->len != len) 1588 return (EINVAL); 1589 bcopy(value, opt->value, len); 1590 } 1591 return (0); 1592 } 1593 return (ENOENT); 1594} 1595 1596int 1597vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1598{ 1599 struct vfsopt *opt; 1600 1601 TAILQ_FOREACH(opt, opts, link) { 1602 if (strcmp(name, opt->name) != 0) 1603 continue; 1604 opt->seen = 1; 1605 if (opt->value == NULL) 1606 opt->len = len; 1607 else { 1608 if (opt->len < len) 1609 return (EINVAL); 1610 opt->len = len; 1611 bcopy(value, opt->value, len); 1612 } 1613 return (0); 1614 } 1615 return (ENOENT); 1616} 1617 1618int 1619vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1620{ 1621 struct vfsopt *opt; 1622 1623 TAILQ_FOREACH(opt, opts, link) { 1624 if (strcmp(name, opt->name) != 0) 1625 continue; 1626 opt->seen = 1; 1627 if (opt->value == NULL) 1628 opt->len = strlen(value) + 1; 1629 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1630 return (EINVAL); 1631 return (0); 1632 } 1633 return (ENOENT); 1634} 1635 1636/* 1637 * Find and copy a mount option. 1638 * 1639 * The size of the buffer has to be specified 1640 * in len, if it is not the same length as the 1641 * mount option, EINVAL is returned. 1642 * Returns ENOENT if the option is not found. 1643 */ 1644int 1645vfs_copyopt(opts, name, dest, len) 1646 struct vfsoptlist *opts; 1647 const char *name; 1648 void *dest; 1649 int len; 1650{ 1651 struct vfsopt *opt; 1652 1653 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1654 1655 TAILQ_FOREACH(opt, opts, link) { 1656 if (strcmp(name, opt->name) == 0) { 1657 opt->seen = 1; 1658 if (len != opt->len) 1659 return (EINVAL); 1660 bcopy(opt->value, dest, opt->len); 1661 return (0); 1662 } 1663 } 1664 return (ENOENT); 1665} 1666 1667/* 1668 * These are helper functions for filesystems to traverse all 1669 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h. 1670 * 1671 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL. 1672 */ 1673 1674MALLOC_DECLARE(M_VNODE_MARKER); 1675 1676struct vnode * 1677__mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1678{ 1679 struct vnode *vp; 1680 1681 mtx_assert(MNT_MTX(mp), MA_OWNED); 1682 1683 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1684 if (should_yield()) { 1685 MNT_IUNLOCK(mp); 1686 kern_yield(PRI_UNCHANGED); 1687 MNT_ILOCK(mp); 1688 } 1689 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1690 while (vp != NULL && vp->v_type == VMARKER) 1691 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1692 1693 /* Check if we are done */ 1694 if (vp == NULL) { 1695 __mnt_vnode_markerfree(mvp, mp); 1696 return (NULL); 1697 } 1698 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1699 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1700 return (vp); 1701} 1702 1703struct vnode * 1704__mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1705{ 1706 struct vnode *vp; 1707 1708 mtx_assert(MNT_MTX(mp), MA_OWNED); 1709 1710 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1711 while (vp != NULL && vp->v_type == VMARKER) 1712 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1713 1714 /* Check if we are done */ 1715 if (vp == NULL) { 1716 *mvp = NULL; 1717 return (NULL); 1718 } 1719 MNT_REF(mp); 1720 MNT_IUNLOCK(mp); 1721 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1722 M_VNODE_MARKER, 1723 M_WAITOK | M_ZERO); 1724 MNT_ILOCK(mp); 1725 (*mvp)->v_type = VMARKER; 1726 1727 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1728 while (vp != NULL && vp->v_type == VMARKER) 1729 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1730 1731 /* Check if we are done */ 1732 if (vp == NULL) { 1733 MNT_IUNLOCK(mp); 1734 free(*mvp, M_VNODE_MARKER); 1735 MNT_ILOCK(mp); 1736 *mvp = NULL; 1737 MNT_REL(mp); 1738 return (NULL); 1739 } 1740 (*mvp)->v_mount = mp; 1741 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1742 return (vp); 1743} 1744 1745 1746void 1747__mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1748{ 1749 1750 if (*mvp == NULL) 1751 return; 1752 1753 mtx_assert(MNT_MTX(mp), MA_OWNED); 1754 1755 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1756 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1757 MNT_IUNLOCK(mp); 1758 free(*mvp, M_VNODE_MARKER); 1759 MNT_ILOCK(mp); 1760 *mvp = NULL; 1761 MNT_REL(mp); 1762} 1763 1764int 1765__vfs_statfs(struct mount *mp, struct statfs *sbp) 1766{ 1767 int error; 1768 1769 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1770 if (sbp != &mp->mnt_stat) 1771 *sbp = mp->mnt_stat; 1772 return (error); 1773} 1774 1775void 1776vfs_mountedfrom(struct mount *mp, const char *from) 1777{ 1778 1779 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1780 strlcpy(mp->mnt_stat.f_mntfromname, from, 1781 sizeof mp->mnt_stat.f_mntfromname); 1782} 1783 1784/* 1785 * --------------------------------------------------------------------- 1786 * This is the api for building mount args and mounting filesystems from 1787 * inside the kernel. 1788 * 1789 * The API works by accumulation of individual args. First error is 1790 * latched. 1791 * 1792 * XXX: should be documented in new manpage kernel_mount(9) 1793 */ 1794 1795/* A memory allocation which must be freed when we are done */ 1796struct mntaarg { 1797 SLIST_ENTRY(mntaarg) next; 1798}; 1799 1800/* The header for the mount arguments */ 1801struct mntarg { 1802 struct iovec *v; 1803 int len; 1804 int error; 1805 SLIST_HEAD(, mntaarg) list; 1806}; 1807 1808/* 1809 * Add a boolean argument. 1810 * 1811 * flag is the boolean value. 1812 * name must start with "no". 1813 */ 1814struct mntarg * 1815mount_argb(struct mntarg *ma, int flag, const char *name) 1816{ 1817 1818 KASSERT(name[0] == 'n' && name[1] == 'o', 1819 ("mount_argb(...,%s): name must start with 'no'", name)); 1820 1821 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1822} 1823 1824/* 1825 * Add an argument printf style 1826 */ 1827struct mntarg * 1828mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1829{ 1830 va_list ap; 1831 struct mntaarg *maa; 1832 struct sbuf *sb; 1833 int len; 1834 1835 if (ma == NULL) { 1836 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1837 SLIST_INIT(&ma->list); 1838 } 1839 if (ma->error) 1840 return (ma); 1841 1842 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1843 M_MOUNT, M_WAITOK); 1844 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1845 ma->v[ma->len].iov_len = strlen(name) + 1; 1846 ma->len++; 1847 1848 sb = sbuf_new_auto(); 1849 va_start(ap, fmt); 1850 sbuf_vprintf(sb, fmt, ap); 1851 va_end(ap); 1852 sbuf_finish(sb); 1853 len = sbuf_len(sb) + 1; 1854 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1855 SLIST_INSERT_HEAD(&ma->list, maa, next); 1856 bcopy(sbuf_data(sb), maa + 1, len); 1857 sbuf_delete(sb); 1858 1859 ma->v[ma->len].iov_base = maa + 1; 1860 ma->v[ma->len].iov_len = len; 1861 ma->len++; 1862 1863 return (ma); 1864} 1865 1866/* 1867 * Add an argument which is a userland string. 1868 */ 1869struct mntarg * 1870mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1871{ 1872 struct mntaarg *maa; 1873 char *tbuf; 1874 1875 if (val == NULL) 1876 return (ma); 1877 if (ma == NULL) { 1878 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1879 SLIST_INIT(&ma->list); 1880 } 1881 if (ma->error) 1882 return (ma); 1883 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1884 SLIST_INSERT_HEAD(&ma->list, maa, next); 1885 tbuf = (void *)(maa + 1); 1886 ma->error = copyinstr(val, tbuf, len, NULL); 1887 return (mount_arg(ma, name, tbuf, -1)); 1888} 1889 1890/* 1891 * Plain argument. 1892 * 1893 * If length is -1, treat value as a C string. 1894 */ 1895struct mntarg * 1896mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1897{ 1898 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 1906 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1907 M_MOUNT, M_WAITOK); 1908 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1909 ma->v[ma->len].iov_len = strlen(name) + 1; 1910 ma->len++; 1911 1912 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1913 if (len < 0) 1914 ma->v[ma->len].iov_len = strlen(val) + 1; 1915 else 1916 ma->v[ma->len].iov_len = len; 1917 ma->len++; 1918 return (ma); 1919} 1920 1921/* 1922 * Free a mntarg structure 1923 */ 1924static void 1925free_mntarg(struct mntarg *ma) 1926{ 1927 struct mntaarg *maa; 1928 1929 while (!SLIST_EMPTY(&ma->list)) { 1930 maa = SLIST_FIRST(&ma->list); 1931 SLIST_REMOVE_HEAD(&ma->list, next); 1932 free(maa, M_MOUNT); 1933 } 1934 free(ma->v, M_MOUNT); 1935 free(ma, M_MOUNT); 1936} 1937 1938/* 1939 * Mount a filesystem 1940 */ 1941int 1942kernel_mount(struct mntarg *ma, uint64_t flags) 1943{ 1944 struct uio auio; 1945 int error; 1946 1947 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1948 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1949 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1950 1951 auio.uio_iov = ma->v; 1952 auio.uio_iovcnt = ma->len; 1953 auio.uio_segflg = UIO_SYSSPACE; 1954 1955 error = ma->error; 1956 if (!error) 1957 error = vfs_donmount(curthread, flags, &auio); 1958 free_mntarg(ma); 1959 return (error); 1960} 1961 1962/* 1963 * A printflike function to mount a filesystem. 1964 */ 1965int 1966kernel_vmount(int flags, ...) 1967{ 1968 struct mntarg *ma = NULL; 1969 va_list ap; 1970 const char *cp; 1971 const void *vp; 1972 int error; 1973 1974 va_start(ap, flags); 1975 for (;;) { 1976 cp = va_arg(ap, const char *); 1977 if (cp == NULL) 1978 break; 1979 vp = va_arg(ap, const void *); 1980 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1981 } 1982 va_end(ap); 1983 1984 error = kernel_mount(ma, flags); 1985 return (error); 1986} 1987 1988void 1989vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1990{ 1991 1992 bcopy(oexp, exp, sizeof(*oexp)); 1993 exp->ex_numsecflavors = 0; 1994} 1995