vfs_mount.c revision 224655
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: head/sys/kern/vfs_mount.c 224655 2011-08-05 11:12:50Z mm $"); 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, 74 char *fspath, int 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"); 82MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 83static uma_zone_t mount_zone; 84 85/* List of mounted filesystems. */ 86struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 87 88/* For any iteration/modification of mountlist */ 89struct mtx mountlist_mtx; 90MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 91 92/* 93 * Global opts, taken by all filesystems 94 */ 95static const char *global_opts[] = { 96 "errmsg", 97 "fstype", 98 "fspath", 99 "ro", 100 "rw", 101 "nosuid", 102 "noexec", 103 NULL 104}; 105 106static int 107mount_init(void *mem, int size, int flags) 108{ 109 struct mount *mp; 110 111 mp = (struct mount *)mem; 112 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 113 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 114 return (0); 115} 116 117static void 118mount_fini(void *mem, int size) 119{ 120 struct mount *mp; 121 122 mp = (struct mount *)mem; 123 lockdestroy(&mp->mnt_explock); 124 mtx_destroy(&mp->mnt_mtx); 125} 126 127static void 128vfs_mount_init(void *dummy __unused) 129{ 130 131 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 132 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 133} 134SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 135 136/* 137 * --------------------------------------------------------------------- 138 * Functions for building and sanitizing the mount options 139 */ 140 141/* Remove one mount option. */ 142static void 143vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 144{ 145 146 TAILQ_REMOVE(opts, opt, link); 147 free(opt->name, M_MOUNT); 148 if (opt->value != NULL) 149 free(opt->value, M_MOUNT); 150 free(opt, M_MOUNT); 151} 152 153/* Release all resources related to the mount options. */ 154void 155vfs_freeopts(struct vfsoptlist *opts) 156{ 157 struct vfsopt *opt; 158 159 while (!TAILQ_EMPTY(opts)) { 160 opt = TAILQ_FIRST(opts); 161 vfs_freeopt(opts, opt); 162 } 163 free(opts, M_MOUNT); 164} 165 166void 167vfs_deleteopt(struct vfsoptlist *opts, const char *name) 168{ 169 struct vfsopt *opt, *temp; 170 171 if (opts == NULL) 172 return; 173 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 174 if (strcmp(opt->name, name) == 0) 175 vfs_freeopt(opts, opt); 176 } 177} 178 179static int 180vfs_isopt_ro(const char *opt) 181{ 182 183 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 184 strcmp(opt, "norw") == 0) 185 return (1); 186 return (0); 187} 188 189static int 190vfs_isopt_rw(const char *opt) 191{ 192 193 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 194 return (1); 195 return (0); 196} 197 198/* 199 * Check if options are equal (with or without the "no" prefix). 200 */ 201static int 202vfs_equalopts(const char *opt1, const char *opt2) 203{ 204 char *p; 205 206 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 207 if (strcmp(opt1, opt2) == 0) 208 return (1); 209 /* "noopt" vs. "opt" */ 210 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 211 return (1); 212 /* "opt" vs. "noopt" */ 213 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 214 return (1); 215 while ((p = strchr(opt1, '.')) != NULL && 216 !strncmp(opt1, opt2, ++p - opt1)) { 217 opt2 += p - opt1; 218 opt1 = p; 219 /* "foo.noopt" vs. "foo.opt" */ 220 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 221 return (1); 222 /* "foo.opt" vs. "foo.noopt" */ 223 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 224 return (1); 225 } 226 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 227 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 228 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 229 return (1); 230 return (0); 231} 232 233/* 234 * If a mount option is specified several times, 235 * (with or without the "no" prefix) only keep 236 * the last occurence of it. 237 */ 238static void 239vfs_sanitizeopts(struct vfsoptlist *opts) 240{ 241 struct vfsopt *opt, *opt2, *tmp; 242 243 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 244 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 245 while (opt2 != NULL) { 246 if (vfs_equalopts(opt->name, opt2->name)) { 247 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 248 vfs_freeopt(opts, opt2); 249 opt2 = tmp; 250 } else { 251 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 252 } 253 } 254 } 255} 256 257/* 258 * Build a linked list of mount options from a struct uio. 259 */ 260int 261vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 262{ 263 struct vfsoptlist *opts; 264 struct vfsopt *opt; 265 size_t memused, namelen, optlen; 266 unsigned int i, iovcnt; 267 int error; 268 269 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 270 TAILQ_INIT(opts); 271 memused = 0; 272 iovcnt = auio->uio_iovcnt; 273 for (i = 0; i < iovcnt; i += 2) { 274 namelen = auio->uio_iov[i].iov_len; 275 optlen = auio->uio_iov[i + 1].iov_len; 276 memused += sizeof(struct vfsopt) + optlen + namelen; 277 /* 278 * Avoid consuming too much memory, and attempts to overflow 279 * memused. 280 */ 281 if (memused > VFS_MOUNTARG_SIZE_MAX || 282 optlen > VFS_MOUNTARG_SIZE_MAX || 283 namelen > VFS_MOUNTARG_SIZE_MAX) { 284 error = EINVAL; 285 goto bad; 286 } 287 288 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 289 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 290 opt->value = NULL; 291 opt->len = 0; 292 opt->pos = i / 2; 293 opt->seen = 0; 294 295 /* 296 * Do this early, so jumps to "bad" will free the current 297 * option. 298 */ 299 TAILQ_INSERT_TAIL(opts, opt, link); 300 301 if (auio->uio_segflg == UIO_SYSSPACE) { 302 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 303 } else { 304 error = copyin(auio->uio_iov[i].iov_base, opt->name, 305 namelen); 306 if (error) 307 goto bad; 308 } 309 /* Ensure names are null-terminated strings. */ 310 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 311 error = EINVAL; 312 goto bad; 313 } 314 if (optlen != 0) { 315 opt->len = optlen; 316 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 317 if (auio->uio_segflg == UIO_SYSSPACE) { 318 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 319 optlen); 320 } else { 321 error = copyin(auio->uio_iov[i + 1].iov_base, 322 opt->value, optlen); 323 if (error) 324 goto bad; 325 } 326 } 327 } 328 vfs_sanitizeopts(opts); 329 *options = opts; 330 return (0); 331bad: 332 vfs_freeopts(opts); 333 return (error); 334} 335 336/* 337 * Merge the old mount options with the new ones passed 338 * in the MNT_UPDATE case. 339 * 340 * XXX: This function will keep a "nofoo" option in the new 341 * options. E.g, if the option's canonical name is "foo", 342 * "nofoo" ends up in the mount point's active options. 343 */ 344static void 345vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 346{ 347 struct vfsopt *opt, *new; 348 349 TAILQ_FOREACH(opt, oldopts, link) { 350 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 351 new->name = strdup(opt->name, M_MOUNT); 352 if (opt->len != 0) { 353 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 354 bcopy(opt->value, new->value, opt->len); 355 } else 356 new->value = NULL; 357 new->len = opt->len; 358 new->seen = opt->seen; 359 TAILQ_INSERT_HEAD(toopts, new, link); 360 } 361 vfs_sanitizeopts(toopts); 362} 363 364/* 365 * Verify vnode's global path 366 */ 367static int 368vfs_verify_global_path(struct thread *td, struct vnode *vp, char *fspath) 369{ 370 struct nameidata nd; 371 struct vnode *vp1; 372 char *rpath, *fbuf; 373 int error; 374 375 ASSERT_VOP_ELOCKED(vp, __func__); 376 377 /* Construct global filesystem path from vp. */ 378 VOP_UNLOCK(vp, 0); 379 error = vn_fullpath_global(td, vp, &rpath, &fbuf); 380 if (error != 0) { 381 vrele(vp); 382 return (error); 383 } 384 if (strlen(rpath) >= MNAMELEN) { 385 vrele(vp); 386 error = ENAMETOOLONG; 387 goto out; 388 } 389 390 /* 391 * Re-lookup the vnode by path. As a side effect, the vnode is 392 * relocked. If vnode was renamed, return ENOENT. 393 */ 394 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 395 UIO_SYSSPACE, fspath, td); 396 error = namei(&nd); 397 if (error != 0) { 398 vrele(vp); 399 goto out; 400 } 401 if (NDHASGIANT(&nd)) 402 mtx_unlock(&Giant); 403 NDFREE(&nd, NDF_ONLY_PNBUF); 404 vp1 = nd.ni_vp; 405 vrele(vp); 406 if (vp1 != vp) { 407 vput(vp1); 408 error = ENOENT; 409 goto out; 410 } 411 412 strlcpy(fspath,rpath,MNAMELEN); 413out: 414 free(fbuf, M_TEMP); 415 return (error); 416} 417 418/* 419 * Mount a filesystem. 420 */ 421int 422nmount(td, uap) 423 struct thread *td; 424 struct nmount_args /* { 425 struct iovec *iovp; 426 unsigned int iovcnt; 427 int flags; 428 } */ *uap; 429{ 430 struct uio *auio; 431 int error; 432 u_int iovcnt; 433 434 AUDIT_ARG_FFLAGS(uap->flags); 435 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 436 uap->iovp, uap->iovcnt, uap->flags); 437 438 /* 439 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 440 * userspace to set this flag, but we must filter it out if we want 441 * MNT_UPDATE on the root file system to work. 442 * MNT_ROOTFS should only be set by the kernel when mounting its 443 * root file system. 444 */ 445 uap->flags &= ~MNT_ROOTFS; 446 447 iovcnt = uap->iovcnt; 448 /* 449 * Check that we have an even number of iovec's 450 * and that we have at least two options. 451 */ 452 if ((iovcnt & 1) || (iovcnt < 4)) { 453 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 454 uap->iovcnt); 455 return (EINVAL); 456 } 457 458 error = copyinuio(uap->iovp, iovcnt, &auio); 459 if (error) { 460 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 461 __func__, error); 462 return (error); 463 } 464 error = vfs_donmount(td, uap->flags, auio); 465 466 free(auio, M_IOV); 467 return (error); 468} 469 470/* 471 * --------------------------------------------------------------------- 472 * Various utility functions 473 */ 474 475void 476vfs_ref(struct mount *mp) 477{ 478 479 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 480 MNT_ILOCK(mp); 481 MNT_REF(mp); 482 MNT_IUNLOCK(mp); 483} 484 485void 486vfs_rel(struct mount *mp) 487{ 488 489 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 490 MNT_ILOCK(mp); 491 MNT_REL(mp); 492 MNT_IUNLOCK(mp); 493} 494 495/* 496 * Allocate and initialize the mount point struct. 497 */ 498struct mount * 499vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 500 struct ucred *cred) 501{ 502 struct mount *mp; 503 504 mp = uma_zalloc(mount_zone, M_WAITOK); 505 bzero(&mp->mnt_startzero, 506 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 507 TAILQ_INIT(&mp->mnt_nvnodelist); 508 mp->mnt_nvnodelistsize = 0; 509 mp->mnt_ref = 0; 510 (void) vfs_busy(mp, MBF_NOWAIT); 511 mp->mnt_op = vfsp->vfc_vfsops; 512 mp->mnt_vfc = vfsp; 513 vfsp->vfc_refcount++; /* XXX Unlocked */ 514 mp->mnt_stat.f_type = vfsp->vfc_typenum; 515 mp->mnt_gen++; 516 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 517 mp->mnt_vnodecovered = vp; 518 mp->mnt_cred = crdup(cred); 519 mp->mnt_stat.f_owner = cred->cr_uid; 520 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 521 mp->mnt_iosize_max = DFLTPHYS; 522#ifdef MAC 523 mac_mount_init(mp); 524 mac_mount_create(cred, mp); 525#endif 526 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 527 return (mp); 528} 529 530/* 531 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 532 */ 533void 534vfs_mount_destroy(struct mount *mp) 535{ 536 537 MNT_ILOCK(mp); 538 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 539 if (mp->mnt_kern_flag & MNTK_MWAIT) { 540 mp->mnt_kern_flag &= ~MNTK_MWAIT; 541 wakeup(mp); 542 } 543 while (mp->mnt_ref) 544 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 545 KASSERT(mp->mnt_ref == 0, 546 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 547 __FILE__, __LINE__)); 548 if (mp->mnt_writeopcount != 0) 549 panic("vfs_mount_destroy: nonzero writeopcount"); 550 if (mp->mnt_secondary_writes != 0) 551 panic("vfs_mount_destroy: nonzero secondary_writes"); 552 mp->mnt_vfc->vfc_refcount--; 553 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 554 struct vnode *vp; 555 556 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 557 vprint("", vp); 558 panic("unmount: dangling vnode"); 559 } 560 if (mp->mnt_nvnodelistsize != 0) 561 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 562 if (mp->mnt_lockref != 0) 563 panic("vfs_mount_destroy: nonzero lock refcount"); 564 MNT_IUNLOCK(mp); 565#ifdef MAC 566 mac_mount_destroy(mp); 567#endif 568 if (mp->mnt_opt != NULL) 569 vfs_freeopts(mp->mnt_opt); 570 crfree(mp->mnt_cred); 571 uma_zfree(mount_zone, mp); 572} 573 574int 575vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 576{ 577 struct vfsoptlist *optlist; 578 struct vfsopt *opt, *tmp_opt; 579 char *fstype, *fspath, *errmsg; 580 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 581 582 errmsg = fspath = NULL; 583 errmsg_len = fspathlen = 0; 584 errmsg_pos = -1; 585 586 error = vfs_buildopts(fsoptions, &optlist); 587 if (error) 588 return (error); 589 590 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 591 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 592 593 /* 594 * We need these two options before the others, 595 * and they are mandatory for any filesystem. 596 * Ensure they are NUL terminated as well. 597 */ 598 fstypelen = 0; 599 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 600 if (error || fstype[fstypelen - 1] != '\0') { 601 error = EINVAL; 602 if (errmsg != NULL) 603 strncpy(errmsg, "Invalid fstype", errmsg_len); 604 goto bail; 605 } 606 fspathlen = 0; 607 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 608 if (error || fspath[fspathlen - 1] != '\0') { 609 error = EINVAL; 610 if (errmsg != NULL) 611 strncpy(errmsg, "Invalid fspath", errmsg_len); 612 goto bail; 613 } 614 615 /* 616 * We need to see if we have the "update" option 617 * before we call vfs_domount(), since vfs_domount() has special 618 * logic based on MNT_UPDATE. This is very important 619 * when we want to update the root filesystem. 620 */ 621 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 622 if (strcmp(opt->name, "update") == 0) { 623 fsflags |= MNT_UPDATE; 624 vfs_freeopt(optlist, opt); 625 } 626 else if (strcmp(opt->name, "async") == 0) 627 fsflags |= MNT_ASYNC; 628 else if (strcmp(opt->name, "force") == 0) { 629 fsflags |= MNT_FORCE; 630 vfs_freeopt(optlist, opt); 631 } 632 else if (strcmp(opt->name, "reload") == 0) { 633 fsflags |= MNT_RELOAD; 634 vfs_freeopt(optlist, opt); 635 } 636 else if (strcmp(opt->name, "multilabel") == 0) 637 fsflags |= MNT_MULTILABEL; 638 else if (strcmp(opt->name, "noasync") == 0) 639 fsflags &= ~MNT_ASYNC; 640 else if (strcmp(opt->name, "noatime") == 0) 641 fsflags |= MNT_NOATIME; 642 else if (strcmp(opt->name, "atime") == 0) { 643 free(opt->name, M_MOUNT); 644 opt->name = strdup("nonoatime", M_MOUNT); 645 } 646 else if (strcmp(opt->name, "noclusterr") == 0) 647 fsflags |= MNT_NOCLUSTERR; 648 else if (strcmp(opt->name, "clusterr") == 0) { 649 free(opt->name, M_MOUNT); 650 opt->name = strdup("nonoclusterr", M_MOUNT); 651 } 652 else if (strcmp(opt->name, "noclusterw") == 0) 653 fsflags |= MNT_NOCLUSTERW; 654 else if (strcmp(opt->name, "clusterw") == 0) { 655 free(opt->name, M_MOUNT); 656 opt->name = strdup("nonoclusterw", M_MOUNT); 657 } 658 else if (strcmp(opt->name, "noexec") == 0) 659 fsflags |= MNT_NOEXEC; 660 else if (strcmp(opt->name, "exec") == 0) { 661 free(opt->name, M_MOUNT); 662 opt->name = strdup("nonoexec", M_MOUNT); 663 } 664 else if (strcmp(opt->name, "nosuid") == 0) 665 fsflags |= MNT_NOSUID; 666 else if (strcmp(opt->name, "suid") == 0) { 667 free(opt->name, M_MOUNT); 668 opt->name = strdup("nonosuid", M_MOUNT); 669 } 670 else if (strcmp(opt->name, "nosymfollow") == 0) 671 fsflags |= MNT_NOSYMFOLLOW; 672 else if (strcmp(opt->name, "symfollow") == 0) { 673 free(opt->name, M_MOUNT); 674 opt->name = strdup("nonosymfollow", M_MOUNT); 675 } 676 else if (strcmp(opt->name, "noro") == 0) 677 fsflags &= ~MNT_RDONLY; 678 else if (strcmp(opt->name, "rw") == 0) 679 fsflags &= ~MNT_RDONLY; 680 else if (strcmp(opt->name, "ro") == 0) 681 fsflags |= MNT_RDONLY; 682 else if (strcmp(opt->name, "rdonly") == 0) { 683 free(opt->name, M_MOUNT); 684 opt->name = strdup("ro", M_MOUNT); 685 fsflags |= MNT_RDONLY; 686 } 687 else if (strcmp(opt->name, "suiddir") == 0) 688 fsflags |= MNT_SUIDDIR; 689 else if (strcmp(opt->name, "sync") == 0) 690 fsflags |= MNT_SYNCHRONOUS; 691 else if (strcmp(opt->name, "union") == 0) 692 fsflags |= MNT_UNION; 693 } 694 695 /* 696 * Be ultra-paranoid about making sure the type and fspath 697 * variables will fit in our mp buffers, including the 698 * terminating NUL. 699 */ 700 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 701 error = ENAMETOOLONG; 702 goto bail; 703 } 704 705 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 706bail: 707 /* copyout the errmsg */ 708 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 709 && errmsg_len > 0 && errmsg != NULL) { 710 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 711 bcopy(errmsg, 712 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 713 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 714 } else { 715 copyout(errmsg, 716 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 717 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 718 } 719 } 720 721 if (optlist != NULL) 722 vfs_freeopts(optlist); 723 return (error); 724} 725 726/* 727 * Old mount API. 728 */ 729#ifndef _SYS_SYSPROTO_H_ 730struct mount_args { 731 char *type; 732 char *path; 733 int flags; 734 caddr_t data; 735}; 736#endif 737/* ARGSUSED */ 738int 739mount(td, uap) 740 struct thread *td; 741 struct mount_args /* { 742 char *type; 743 char *path; 744 int flags; 745 caddr_t data; 746 } */ *uap; 747{ 748 char *fstype; 749 struct vfsconf *vfsp = NULL; 750 struct mntarg *ma = NULL; 751 int error; 752 753 AUDIT_ARG_FFLAGS(uap->flags); 754 755 /* 756 * Filter out MNT_ROOTFS. We do not want clients of mount() in 757 * userspace to set this flag, but we must filter it out if we want 758 * MNT_UPDATE on the root file system to work. 759 * MNT_ROOTFS should only be set by the kernel when mounting its 760 * root file system. 761 */ 762 uap->flags &= ~MNT_ROOTFS; 763 764 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 765 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 766 if (error) { 767 free(fstype, M_TEMP); 768 return (error); 769 } 770 771 AUDIT_ARG_TEXT(fstype); 772 mtx_lock(&Giant); 773 vfsp = vfs_byname_kld(fstype, td, &error); 774 free(fstype, M_TEMP); 775 if (vfsp == NULL) { 776 mtx_unlock(&Giant); 777 return (ENOENT); 778 } 779 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 780 mtx_unlock(&Giant); 781 return (EOPNOTSUPP); 782 } 783 784 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 785 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 786 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 787 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 788 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 789 790 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags); 791 mtx_unlock(&Giant); 792 return (error); 793} 794 795/* 796 * vfs_domount_first(): first file system mount (not update) 797 */ 798static int 799vfs_domount_first( 800 struct thread *td, /* Calling thread. */ 801 struct vfsconf *vfsp, /* File system type. */ 802 char *fspath, /* Mount path. */ 803 struct vnode *vp, /* Vnode to be covered. */ 804 int fsflags, /* Flags common to all filesystems. */ 805 struct vfsoptlist **optlist /* Options local to the filesystem. */ 806 ) 807{ 808 struct vattr va; 809 struct mount *mp; 810 struct vnode *newdp; 811 int error; 812 813 mtx_assert(&Giant, MA_OWNED); 814 ASSERT_VOP_ELOCKED(vp, __func__); 815 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 816 817 /* 818 * If the user is not root, ensure that they own the directory 819 * onto which we are attempting to mount. 820 */ 821 error = VOP_GETATTR(vp, &va, td->td_ucred); 822 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 823 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 824 if (error == 0) 825 error = vinvalbuf(vp, V_SAVE, 0, 0); 826 if (error == 0 && vp->v_type != VDIR) 827 error = ENOTDIR; 828 if (error == 0) { 829 VI_LOCK(vp); 830 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 831 vp->v_iflag |= VI_MOUNT; 832 else 833 error = EBUSY; 834 VI_UNLOCK(vp); 835 } 836 if (error != 0) { 837 vput(vp); 838 return (error); 839 } 840 VOP_UNLOCK(vp, 0); 841 842 /* Allocate and initialize the filesystem. */ 843 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 844 /* XXXMAC: pass to vfs_mount_alloc? */ 845 mp->mnt_optnew = *optlist; 846 /* Set the mount level flags. */ 847 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 848 849 /* 850 * Mount the filesystem. 851 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 852 * get. No freeing of cn_pnbuf. 853 */ 854 error = VFS_MOUNT(mp); 855 if (error != 0) { 856 vfs_unbusy(mp); 857 vfs_mount_destroy(mp); 858 VI_LOCK(vp); 859 vp->v_iflag &= ~VI_MOUNT; 860 VI_UNLOCK(vp); 861 vrele(vp); 862 return (error); 863 } 864 865 if (mp->mnt_opt != NULL) 866 vfs_freeopts(mp->mnt_opt); 867 mp->mnt_opt = mp->mnt_optnew; 868 *optlist = NULL; 869 (void)VFS_STATFS(mp, &mp->mnt_stat); 870 871 /* 872 * Prevent external consumers of mount options from reading mnt_optnew. 873 */ 874 mp->mnt_optnew = NULL; 875 876 MNT_ILOCK(mp); 877 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 878 mp->mnt_kern_flag |= MNTK_ASYNC; 879 else 880 mp->mnt_kern_flag &= ~MNTK_ASYNC; 881 MNT_IUNLOCK(mp); 882 883 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 884 cache_purge(vp); 885 VI_LOCK(vp); 886 vp->v_iflag &= ~VI_MOUNT; 887 VI_UNLOCK(vp); 888 vp->v_mountedhere = mp; 889 /* Place the new filesystem at the end of the mount list. */ 890 mtx_lock(&mountlist_mtx); 891 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 892 mtx_unlock(&mountlist_mtx); 893 vfs_event_signal(NULL, VQ_MOUNT, 0); 894 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 895 panic("mount: lost mount"); 896 VOP_UNLOCK(newdp, 0); 897 VOP_UNLOCK(vp, 0); 898 mountcheckdirs(vp, newdp); 899 vrele(newdp); 900 if ((mp->mnt_flag & MNT_RDONLY) == 0) 901 vfs_allocate_syncvnode(mp); 902 vfs_unbusy(mp); 903 return (0); 904} 905 906/* 907 * vfs_domount_update(): update of mounted file system 908 */ 909static int 910vfs_domount_update( 911 struct thread *td, /* Calling thread. */ 912 struct vnode *vp, /* Mount point vnode. */ 913 int fsflags, /* Flags common to all filesystems. */ 914 struct vfsoptlist **optlist /* Options local to the filesystem. */ 915 ) 916{ 917 struct oexport_args oexport; 918 struct export_args export; 919 struct mount *mp; 920 int error, export_error, flag; 921 922 mtx_assert(&Giant, MA_OWNED); 923 ASSERT_VOP_ELOCKED(vp, __func__); 924 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 925 926 if ((vp->v_vflag & VV_ROOT) == 0) { 927 vput(vp); 928 return (EINVAL); 929 } 930 mp = vp->v_mount; 931 /* 932 * We only allow the filesystem to be reloaded if it 933 * is currently mounted read-only. 934 */ 935 flag = mp->mnt_flag; 936 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 937 vput(vp); 938 return (EOPNOTSUPP); /* Needs translation */ 939 } 940 /* 941 * Only privileged root, or (if MNT_USER is set) the user that 942 * did the original mount is permitted to update it. 943 */ 944 error = vfs_suser(mp, td); 945 if (error != 0) { 946 vput(vp); 947 return (error); 948 } 949 if (vfs_busy(mp, MBF_NOWAIT)) { 950 vput(vp); 951 return (EBUSY); 952 } 953 VI_LOCK(vp); 954 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 955 VI_UNLOCK(vp); 956 vfs_unbusy(mp); 957 vput(vp); 958 return (EBUSY); 959 } 960 vp->v_iflag |= VI_MOUNT; 961 VI_UNLOCK(vp); 962 VOP_UNLOCK(vp, 0); 963 964 MNT_ILOCK(mp); 965 mp->mnt_flag &= ~MNT_UPDATEMASK; 966 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 967 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 968 if ((mp->mnt_flag & MNT_ASYNC) == 0) 969 mp->mnt_kern_flag &= ~MNTK_ASYNC; 970 MNT_IUNLOCK(mp); 971 mp->mnt_optnew = *optlist; 972 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 973 974 /* 975 * Mount the filesystem. 976 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 977 * get. No freeing of cn_pnbuf. 978 */ 979 error = VFS_MOUNT(mp); 980 981 export_error = 0; 982 if (error == 0) { 983 /* Process the export option. */ 984 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 985 sizeof(export)) == 0) { 986 export_error = vfs_export(mp, &export); 987 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 988 sizeof(oexport)) == 0) { 989 export.ex_flags = oexport.ex_flags; 990 export.ex_root = oexport.ex_root; 991 export.ex_anon = oexport.ex_anon; 992 export.ex_addr = oexport.ex_addr; 993 export.ex_addrlen = oexport.ex_addrlen; 994 export.ex_mask = oexport.ex_mask; 995 export.ex_masklen = oexport.ex_masklen; 996 export.ex_indexfile = oexport.ex_indexfile; 997 export.ex_numsecflavors = 0; 998 export_error = vfs_export(mp, &export); 999 } 1000 } 1001 1002 MNT_ILOCK(mp); 1003 if (error == 0) { 1004 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 1005 MNT_SNAPSHOT); 1006 } else { 1007 /* 1008 * If we fail, restore old mount flags. MNT_QUOTA is special, 1009 * because it is not part of MNT_UPDATEMASK, but it could have 1010 * changed in the meantime if quotactl(2) was called. 1011 * All in all we want current value of MNT_QUOTA, not the old 1012 * one. 1013 */ 1014 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 1015 } 1016 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1017 mp->mnt_kern_flag |= MNTK_ASYNC; 1018 else 1019 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1020 MNT_IUNLOCK(mp); 1021 1022 if (error != 0) 1023 goto end; 1024 1025 if (mp->mnt_opt != NULL) 1026 vfs_freeopts(mp->mnt_opt); 1027 mp->mnt_opt = mp->mnt_optnew; 1028 *optlist = NULL; 1029 (void)VFS_STATFS(mp, &mp->mnt_stat); 1030 /* 1031 * Prevent external consumers of mount options from reading 1032 * mnt_optnew. 1033 */ 1034 mp->mnt_optnew = NULL; 1035 1036 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1037 vfs_allocate_syncvnode(mp); 1038 else 1039 vfs_deallocate_syncvnode(mp); 1040end: 1041 vfs_unbusy(mp); 1042 VI_LOCK(vp); 1043 vp->v_iflag &= ~VI_MOUNT; 1044 VI_UNLOCK(vp); 1045 vrele(vp); 1046 return (error != 0 ? error : export_error); 1047} 1048 1049/* 1050 * vfs_domount(): actually attempt a filesystem mount. 1051 */ 1052static int 1053vfs_domount( 1054 struct thread *td, /* Calling thread. */ 1055 const char *fstype, /* Filesystem type. */ 1056 char *fspath, /* Mount path. */ 1057 int fsflags, /* Flags common to all filesystems. */ 1058 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1059 ) 1060{ 1061 struct vfsconf *vfsp; 1062 struct nameidata nd; 1063 struct vnode *vp; 1064 int error; 1065 1066 /* 1067 * Be ultra-paranoid about making sure the type and fspath 1068 * variables will fit in our mp buffers, including the 1069 * terminating NUL. 1070 */ 1071 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1072 return (ENAMETOOLONG); 1073 1074 if (jailed(td->td_ucred) || usermount == 0) { 1075 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1076 return (error); 1077 } 1078 1079 /* 1080 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1081 */ 1082 if (fsflags & MNT_EXPORTED) { 1083 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1084 if (error) 1085 return (error); 1086 } 1087 if (fsflags & MNT_SUIDDIR) { 1088 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1089 if (error) 1090 return (error); 1091 } 1092 /* 1093 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1094 */ 1095 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1096 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1097 fsflags |= MNT_NOSUID | MNT_USER; 1098 } 1099 1100 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1101 vfsp = NULL; 1102 if ((fsflags & MNT_UPDATE) == 0) { 1103 /* Don't try to load KLDs if we're mounting the root. */ 1104 if (fsflags & MNT_ROOTFS) 1105 vfsp = vfs_byname(fstype); 1106 else 1107 vfsp = vfs_byname_kld(fstype, td, &error); 1108 if (vfsp == NULL) 1109 return (ENODEV); 1110 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1111 return (EPERM); 1112 } 1113 1114 /* 1115 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1116 */ 1117 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1118 UIO_SYSSPACE, fspath, td); 1119 error = namei(&nd); 1120 if (error != 0) 1121 return (error); 1122 if (!NDHASGIANT(&nd)) 1123 mtx_lock(&Giant); 1124 NDFREE(&nd, NDF_ONLY_PNBUF); 1125 vp = nd.ni_vp; 1126 if ((fsflags & MNT_UPDATE) == 0) { 1127 error = vfs_verify_global_path(td, vp, fspath); 1128 if (error == 0) 1129 error = vfs_domount_first(td, vfsp, fspath, vp, 1130 fsflags, optlist); 1131 } else 1132 error = vfs_domount_update(td, vp, fsflags, optlist); 1133 mtx_unlock(&Giant); 1134 1135 return (error); 1136} 1137 1138/* 1139 * Unmount a filesystem. 1140 * 1141 * Note: unmount takes a path to the vnode mounted on as argument, not 1142 * special file (as before). 1143 */ 1144#ifndef _SYS_SYSPROTO_H_ 1145struct unmount_args { 1146 char *path; 1147 int flags; 1148}; 1149#endif 1150/* ARGSUSED */ 1151int 1152unmount(td, uap) 1153 struct thread *td; 1154 register struct unmount_args /* { 1155 char *path; 1156 int flags; 1157 } */ *uap; 1158{ 1159 struct mount *mp; 1160 struct nameidata nd; 1161 char *pathbuf; 1162 int error, id0, id1; 1163 1164 AUDIT_ARG_VALUE(uap->flags); 1165 if (jailed(td->td_ucred) || usermount == 0) { 1166 error = priv_check(td, PRIV_VFS_UNMOUNT); 1167 if (error) 1168 return (error); 1169 } 1170 1171 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1172 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1173 if (error) { 1174 free(pathbuf, M_TEMP); 1175 return (error); 1176 } 1177 mtx_lock(&Giant); 1178 if (uap->flags & MNT_BYFSID) { 1179 AUDIT_ARG_TEXT(pathbuf); 1180 /* Decode the filesystem ID. */ 1181 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1182 mtx_unlock(&Giant); 1183 free(pathbuf, M_TEMP); 1184 return (EINVAL); 1185 } 1186 1187 mtx_lock(&mountlist_mtx); 1188 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1189 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1190 mp->mnt_stat.f_fsid.val[1] == id1) 1191 break; 1192 } 1193 mtx_unlock(&mountlist_mtx); 1194 } else { 1195 AUDIT_ARG_UPATH1(td, pathbuf); 1196 /* 1197 * If we are jailed and this is not a root jail try to find 1198 * global path for path argument. 1199 */ 1200 if (jailed(td->td_ucred) && 1201 td->td_ucred->cr_prison->pr_root != rootvnode) { 1202 NDINIT(&nd, LOOKUP, 1203 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1204 UIO_SYSSPACE, pathbuf, td); 1205 if (namei(&nd) == 0) { 1206 if (NDHASGIANT(&nd)) 1207 mtx_unlock(&Giant); 1208 NDFREE(&nd, NDF_ONLY_PNBUF); 1209 error = vfs_verify_global_path(td, nd.ni_vp, 1210 pathbuf); 1211 if (error == 0) 1212 vput(nd.ni_vp); 1213 } 1214 } 1215 mtx_lock(&mountlist_mtx); 1216 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1217 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1218 break; 1219 } 1220 mtx_unlock(&mountlist_mtx); 1221 } 1222 free(pathbuf, M_TEMP); 1223 if (mp == NULL) { 1224 /* 1225 * Previously we returned ENOENT for a nonexistent path and 1226 * EINVAL for a non-mountpoint. We cannot tell these apart 1227 * now, so in the !MNT_BYFSID case return the more likely 1228 * EINVAL for compatibility. 1229 */ 1230 mtx_unlock(&Giant); 1231 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1232 } 1233 1234 /* 1235 * Don't allow unmounting the root filesystem. 1236 */ 1237 if (mp->mnt_flag & MNT_ROOTFS) { 1238 mtx_unlock(&Giant); 1239 return (EINVAL); 1240 } 1241 error = dounmount(mp, uap->flags, td); 1242 mtx_unlock(&Giant); 1243 return (error); 1244} 1245 1246/* 1247 * Do the actual filesystem unmount. 1248 */ 1249int 1250dounmount(mp, flags, td) 1251 struct mount *mp; 1252 int flags; 1253 struct thread *td; 1254{ 1255 struct vnode *coveredvp, *fsrootvp; 1256 int error; 1257 int async_flag; 1258 int mnt_gen_r; 1259 1260 mtx_assert(&Giant, MA_OWNED); 1261 1262 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1263 mnt_gen_r = mp->mnt_gen; 1264 VI_LOCK(coveredvp); 1265 vholdl(coveredvp); 1266 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1267 vdrop(coveredvp); 1268 /* 1269 * Check for mp being unmounted while waiting for the 1270 * covered vnode lock. 1271 */ 1272 if (coveredvp->v_mountedhere != mp || 1273 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1274 VOP_UNLOCK(coveredvp, 0); 1275 return (EBUSY); 1276 } 1277 } 1278 /* 1279 * Only privileged root, or (if MNT_USER is set) the user that did the 1280 * original mount is permitted to unmount this filesystem. 1281 */ 1282 error = vfs_suser(mp, td); 1283 if (error) { 1284 if (coveredvp) 1285 VOP_UNLOCK(coveredvp, 0); 1286 return (error); 1287 } 1288 1289 MNT_ILOCK(mp); 1290 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1291 MNT_IUNLOCK(mp); 1292 if (coveredvp) 1293 VOP_UNLOCK(coveredvp, 0); 1294 return (EBUSY); 1295 } 1296 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1297 /* Allow filesystems to detect that a forced unmount is in progress. */ 1298 if (flags & MNT_FORCE) 1299 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1300 error = 0; 1301 if (mp->mnt_lockref) { 1302 if ((flags & MNT_FORCE) == 0) { 1303 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ | 1304 MNTK_UNMOUNTF); 1305 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1306 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1307 wakeup(mp); 1308 } 1309 MNT_IUNLOCK(mp); 1310 if (coveredvp) 1311 VOP_UNLOCK(coveredvp, 0); 1312 return (EBUSY); 1313 } 1314 mp->mnt_kern_flag |= MNTK_DRAINING; 1315 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1316 "mount drain", 0); 1317 } 1318 MNT_IUNLOCK(mp); 1319 KASSERT(mp->mnt_lockref == 0, 1320 ("%s: invalid lock refcount in the drain path @ %s:%d", 1321 __func__, __FILE__, __LINE__)); 1322 KASSERT(error == 0, 1323 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1324 __func__, __FILE__, __LINE__)); 1325 vn_start_write(NULL, &mp, V_WAIT); 1326 1327 if (mp->mnt_flag & MNT_EXPUBLIC) 1328 vfs_setpublicfs(NULL, NULL, NULL); 1329 1330 vfs_msync(mp, MNT_WAIT); 1331 MNT_ILOCK(mp); 1332 async_flag = mp->mnt_flag & MNT_ASYNC; 1333 mp->mnt_flag &= ~MNT_ASYNC; 1334 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1335 MNT_IUNLOCK(mp); 1336 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1337 vfs_deallocate_syncvnode(mp); 1338 /* 1339 * For forced unmounts, move process cdir/rdir refs on the fs root 1340 * vnode to the covered vnode. For non-forced unmounts we want 1341 * such references to cause an EBUSY error. 1342 */ 1343 if ((flags & MNT_FORCE) && 1344 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1345 if (mp->mnt_vnodecovered != NULL) 1346 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1347 if (fsrootvp == rootvnode) { 1348 vrele(rootvnode); 1349 rootvnode = NULL; 1350 } 1351 vput(fsrootvp); 1352 } 1353 if (((mp->mnt_flag & MNT_RDONLY) || 1354 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1355 error = VFS_UNMOUNT(mp, flags); 1356 vn_finished_write(mp); 1357 /* 1358 * If we failed to flush the dirty blocks for this mount point, 1359 * undo all the cdir/rdir and rootvnode changes we made above. 1360 * Unless we failed to do so because the device is reporting that 1361 * it doesn't exist anymore. 1362 */ 1363 if (error && error != ENXIO) { 1364 if ((flags & MNT_FORCE) && 1365 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1366 if (mp->mnt_vnodecovered != NULL) 1367 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1368 if (rootvnode == NULL) { 1369 rootvnode = fsrootvp; 1370 vref(rootvnode); 1371 } 1372 vput(fsrootvp); 1373 } 1374 MNT_ILOCK(mp); 1375 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1376 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1377 MNT_IUNLOCK(mp); 1378 vfs_allocate_syncvnode(mp); 1379 MNT_ILOCK(mp); 1380 } 1381 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1382 mp->mnt_flag |= async_flag; 1383 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1384 mp->mnt_kern_flag |= MNTK_ASYNC; 1385 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1386 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1387 wakeup(mp); 1388 } 1389 MNT_IUNLOCK(mp); 1390 if (coveredvp) 1391 VOP_UNLOCK(coveredvp, 0); 1392 return (error); 1393 } 1394 mtx_lock(&mountlist_mtx); 1395 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1396 mtx_unlock(&mountlist_mtx); 1397 if (coveredvp != NULL) { 1398 coveredvp->v_mountedhere = NULL; 1399 vput(coveredvp); 1400 } 1401 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1402 vfs_mount_destroy(mp); 1403 return (0); 1404} 1405 1406/* 1407 * Report errors during filesystem mounting. 1408 */ 1409void 1410vfs_mount_error(struct mount *mp, const char *fmt, ...) 1411{ 1412 struct vfsoptlist *moptlist = mp->mnt_optnew; 1413 va_list ap; 1414 int error, len; 1415 char *errmsg; 1416 1417 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1418 if (error || errmsg == NULL || len <= 0) 1419 return; 1420 1421 va_start(ap, fmt); 1422 vsnprintf(errmsg, (size_t)len, fmt, ap); 1423 va_end(ap); 1424} 1425 1426void 1427vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1428{ 1429 va_list ap; 1430 int error, len; 1431 char *errmsg; 1432 1433 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1434 if (error || errmsg == NULL || len <= 0) 1435 return; 1436 1437 va_start(ap, fmt); 1438 vsnprintf(errmsg, (size_t)len, fmt, ap); 1439 va_end(ap); 1440} 1441 1442/* 1443 * --------------------------------------------------------------------- 1444 * Functions for querying mount options/arguments from filesystems. 1445 */ 1446 1447/* 1448 * Check that no unknown options are given 1449 */ 1450int 1451vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1452{ 1453 struct vfsopt *opt; 1454 char errmsg[255]; 1455 const char **t, *p, *q; 1456 int ret = 0; 1457 1458 TAILQ_FOREACH(opt, opts, link) { 1459 p = opt->name; 1460 q = NULL; 1461 if (p[0] == 'n' && p[1] == 'o') 1462 q = p + 2; 1463 for(t = global_opts; *t != NULL; t++) { 1464 if (strcmp(*t, p) == 0) 1465 break; 1466 if (q != NULL) { 1467 if (strcmp(*t, q) == 0) 1468 break; 1469 } 1470 } 1471 if (*t != NULL) 1472 continue; 1473 for(t = legal; *t != NULL; t++) { 1474 if (strcmp(*t, p) == 0) 1475 break; 1476 if (q != NULL) { 1477 if (strcmp(*t, q) == 0) 1478 break; 1479 } 1480 } 1481 if (*t != NULL) 1482 continue; 1483 snprintf(errmsg, sizeof(errmsg), 1484 "mount option <%s> is unknown", p); 1485 ret = EINVAL; 1486 } 1487 if (ret != 0) { 1488 TAILQ_FOREACH(opt, opts, link) { 1489 if (strcmp(opt->name, "errmsg") == 0) { 1490 strncpy((char *)opt->value, errmsg, opt->len); 1491 break; 1492 } 1493 } 1494 if (opt == NULL) 1495 printf("%s\n", errmsg); 1496 } 1497 return (ret); 1498} 1499 1500/* 1501 * Get a mount option by its name. 1502 * 1503 * Return 0 if the option was found, ENOENT otherwise. 1504 * If len is non-NULL it will be filled with the length 1505 * of the option. If buf is non-NULL, it will be filled 1506 * with the address of the option. 1507 */ 1508int 1509vfs_getopt(opts, name, buf, len) 1510 struct vfsoptlist *opts; 1511 const char *name; 1512 void **buf; 1513 int *len; 1514{ 1515 struct vfsopt *opt; 1516 1517 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1518 1519 TAILQ_FOREACH(opt, opts, link) { 1520 if (strcmp(name, opt->name) == 0) { 1521 opt->seen = 1; 1522 if (len != NULL) 1523 *len = opt->len; 1524 if (buf != NULL) 1525 *buf = opt->value; 1526 return (0); 1527 } 1528 } 1529 return (ENOENT); 1530} 1531 1532int 1533vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1534{ 1535 struct vfsopt *opt; 1536 1537 if (opts == NULL) 1538 return (-1); 1539 1540 TAILQ_FOREACH(opt, opts, link) { 1541 if (strcmp(name, opt->name) == 0) { 1542 opt->seen = 1; 1543 return (opt->pos); 1544 } 1545 } 1546 return (-1); 1547} 1548 1549char * 1550vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1551{ 1552 struct vfsopt *opt; 1553 1554 *error = 0; 1555 TAILQ_FOREACH(opt, opts, link) { 1556 if (strcmp(name, opt->name) != 0) 1557 continue; 1558 opt->seen = 1; 1559 if (opt->len == 0 || 1560 ((char *)opt->value)[opt->len - 1] != '\0') { 1561 *error = EINVAL; 1562 return (NULL); 1563 } 1564 return (opt->value); 1565 } 1566 *error = ENOENT; 1567 return (NULL); 1568} 1569 1570int 1571vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1572 uint64_t val) 1573{ 1574 struct vfsopt *opt; 1575 1576 TAILQ_FOREACH(opt, opts, link) { 1577 if (strcmp(name, opt->name) == 0) { 1578 opt->seen = 1; 1579 if (w != NULL) 1580 *w |= val; 1581 return (1); 1582 } 1583 } 1584 if (w != NULL) 1585 *w &= ~val; 1586 return (0); 1587} 1588 1589int 1590vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1591{ 1592 va_list ap; 1593 struct vfsopt *opt; 1594 int ret; 1595 1596 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1597 1598 TAILQ_FOREACH(opt, opts, link) { 1599 if (strcmp(name, opt->name) != 0) 1600 continue; 1601 opt->seen = 1; 1602 if (opt->len == 0 || opt->value == NULL) 1603 return (0); 1604 if (((char *)opt->value)[opt->len - 1] != '\0') 1605 return (0); 1606 va_start(ap, fmt); 1607 ret = vsscanf(opt->value, fmt, ap); 1608 va_end(ap); 1609 return (ret); 1610 } 1611 return (0); 1612} 1613 1614int 1615vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1616{ 1617 struct vfsopt *opt; 1618 1619 TAILQ_FOREACH(opt, opts, link) { 1620 if (strcmp(name, opt->name) != 0) 1621 continue; 1622 opt->seen = 1; 1623 if (opt->value == NULL) 1624 opt->len = len; 1625 else { 1626 if (opt->len != len) 1627 return (EINVAL); 1628 bcopy(value, opt->value, len); 1629 } 1630 return (0); 1631 } 1632 return (ENOENT); 1633} 1634 1635int 1636vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1637{ 1638 struct vfsopt *opt; 1639 1640 TAILQ_FOREACH(opt, opts, link) { 1641 if (strcmp(name, opt->name) != 0) 1642 continue; 1643 opt->seen = 1; 1644 if (opt->value == NULL) 1645 opt->len = len; 1646 else { 1647 if (opt->len < len) 1648 return (EINVAL); 1649 opt->len = len; 1650 bcopy(value, opt->value, len); 1651 } 1652 return (0); 1653 } 1654 return (ENOENT); 1655} 1656 1657int 1658vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1659{ 1660 struct vfsopt *opt; 1661 1662 TAILQ_FOREACH(opt, opts, link) { 1663 if (strcmp(name, opt->name) != 0) 1664 continue; 1665 opt->seen = 1; 1666 if (opt->value == NULL) 1667 opt->len = strlen(value) + 1; 1668 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1669 return (EINVAL); 1670 return (0); 1671 } 1672 return (ENOENT); 1673} 1674 1675/* 1676 * Find and copy a mount option. 1677 * 1678 * The size of the buffer has to be specified 1679 * in len, if it is not the same length as the 1680 * mount option, EINVAL is returned. 1681 * Returns ENOENT if the option is not found. 1682 */ 1683int 1684vfs_copyopt(opts, name, dest, len) 1685 struct vfsoptlist *opts; 1686 const char *name; 1687 void *dest; 1688 int len; 1689{ 1690 struct vfsopt *opt; 1691 1692 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1693 1694 TAILQ_FOREACH(opt, opts, link) { 1695 if (strcmp(name, opt->name) == 0) { 1696 opt->seen = 1; 1697 if (len != opt->len) 1698 return (EINVAL); 1699 bcopy(opt->value, dest, opt->len); 1700 return (0); 1701 } 1702 } 1703 return (ENOENT); 1704} 1705 1706/* 1707 * This is a helper function for filesystems to traverse their 1708 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1709 */ 1710 1711struct vnode * 1712__mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1713{ 1714 struct vnode *vp; 1715 1716 mtx_assert(MNT_MTX(mp), MA_OWNED); 1717 1718 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1719 if (should_yield()) { 1720 MNT_IUNLOCK(mp); 1721 kern_yield(PRI_UNCHANGED); 1722 MNT_ILOCK(mp); 1723 } 1724 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1725 while (vp != NULL && vp->v_type == VMARKER) 1726 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1727 1728 /* Check if we are done */ 1729 if (vp == NULL) { 1730 __mnt_vnode_markerfree(mvp, mp); 1731 return (NULL); 1732 } 1733 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1734 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1735 return (vp); 1736} 1737 1738struct vnode * 1739__mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1740{ 1741 struct vnode *vp; 1742 1743 mtx_assert(MNT_MTX(mp), MA_OWNED); 1744 1745 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1746 while (vp != NULL && vp->v_type == VMARKER) 1747 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1748 1749 /* Check if we are done */ 1750 if (vp == NULL) { 1751 *mvp = NULL; 1752 return (NULL); 1753 } 1754 MNT_REF(mp); 1755 MNT_IUNLOCK(mp); 1756 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1757 M_VNODE_MARKER, 1758 M_WAITOK | M_ZERO); 1759 MNT_ILOCK(mp); 1760 (*mvp)->v_type = VMARKER; 1761 1762 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1763 while (vp != NULL && vp->v_type == VMARKER) 1764 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1765 1766 /* Check if we are done */ 1767 if (vp == NULL) { 1768 MNT_IUNLOCK(mp); 1769 free(*mvp, M_VNODE_MARKER); 1770 MNT_ILOCK(mp); 1771 *mvp = NULL; 1772 MNT_REL(mp); 1773 return (NULL); 1774 } 1775 (*mvp)->v_mount = mp; 1776 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1777 return (vp); 1778} 1779 1780 1781void 1782__mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1783{ 1784 1785 if (*mvp == NULL) 1786 return; 1787 1788 mtx_assert(MNT_MTX(mp), MA_OWNED); 1789 1790 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1791 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1792 MNT_IUNLOCK(mp); 1793 free(*mvp, M_VNODE_MARKER); 1794 MNT_ILOCK(mp); 1795 *mvp = NULL; 1796 MNT_REL(mp); 1797} 1798 1799 1800int 1801__vfs_statfs(struct mount *mp, struct statfs *sbp) 1802{ 1803 int error; 1804 1805 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1806 if (sbp != &mp->mnt_stat) 1807 *sbp = mp->mnt_stat; 1808 return (error); 1809} 1810 1811void 1812vfs_mountedfrom(struct mount *mp, const char *from) 1813{ 1814 1815 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1816 strlcpy(mp->mnt_stat.f_mntfromname, from, 1817 sizeof mp->mnt_stat.f_mntfromname); 1818} 1819 1820/* 1821 * --------------------------------------------------------------------- 1822 * This is the api for building mount args and mounting filesystems from 1823 * inside the kernel. 1824 * 1825 * The API works by accumulation of individual args. First error is 1826 * latched. 1827 * 1828 * XXX: should be documented in new manpage kernel_mount(9) 1829 */ 1830 1831/* A memory allocation which must be freed when we are done */ 1832struct mntaarg { 1833 SLIST_ENTRY(mntaarg) next; 1834}; 1835 1836/* The header for the mount arguments */ 1837struct mntarg { 1838 struct iovec *v; 1839 int len; 1840 int error; 1841 SLIST_HEAD(, mntaarg) list; 1842}; 1843 1844/* 1845 * Add a boolean argument. 1846 * 1847 * flag is the boolean value. 1848 * name must start with "no". 1849 */ 1850struct mntarg * 1851mount_argb(struct mntarg *ma, int flag, const char *name) 1852{ 1853 1854 KASSERT(name[0] == 'n' && name[1] == 'o', 1855 ("mount_argb(...,%s): name must start with 'no'", name)); 1856 1857 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1858} 1859 1860/* 1861 * Add an argument printf style 1862 */ 1863struct mntarg * 1864mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1865{ 1866 va_list ap; 1867 struct mntaarg *maa; 1868 struct sbuf *sb; 1869 int len; 1870 1871 if (ma == NULL) { 1872 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1873 SLIST_INIT(&ma->list); 1874 } 1875 if (ma->error) 1876 return (ma); 1877 1878 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1879 M_MOUNT, M_WAITOK); 1880 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1881 ma->v[ma->len].iov_len = strlen(name) + 1; 1882 ma->len++; 1883 1884 sb = sbuf_new_auto(); 1885 va_start(ap, fmt); 1886 sbuf_vprintf(sb, fmt, ap); 1887 va_end(ap); 1888 sbuf_finish(sb); 1889 len = sbuf_len(sb) + 1; 1890 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1891 SLIST_INSERT_HEAD(&ma->list, maa, next); 1892 bcopy(sbuf_data(sb), maa + 1, len); 1893 sbuf_delete(sb); 1894 1895 ma->v[ma->len].iov_base = maa + 1; 1896 ma->v[ma->len].iov_len = len; 1897 ma->len++; 1898 1899 return (ma); 1900} 1901 1902/* 1903 * Add an argument which is a userland string. 1904 */ 1905struct mntarg * 1906mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1907{ 1908 struct mntaarg *maa; 1909 char *tbuf; 1910 1911 if (val == NULL) 1912 return (ma); 1913 if (ma == NULL) { 1914 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1915 SLIST_INIT(&ma->list); 1916 } 1917 if (ma->error) 1918 return (ma); 1919 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1920 SLIST_INSERT_HEAD(&ma->list, maa, next); 1921 tbuf = (void *)(maa + 1); 1922 ma->error = copyinstr(val, tbuf, len, NULL); 1923 return (mount_arg(ma, name, tbuf, -1)); 1924} 1925 1926/* 1927 * Plain argument. 1928 * 1929 * If length is -1, treat value as a C string. 1930 */ 1931struct mntarg * 1932mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1933{ 1934 1935 if (ma == NULL) { 1936 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1937 SLIST_INIT(&ma->list); 1938 } 1939 if (ma->error) 1940 return (ma); 1941 1942 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1943 M_MOUNT, M_WAITOK); 1944 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1945 ma->v[ma->len].iov_len = strlen(name) + 1; 1946 ma->len++; 1947 1948 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1949 if (len < 0) 1950 ma->v[ma->len].iov_len = strlen(val) + 1; 1951 else 1952 ma->v[ma->len].iov_len = len; 1953 ma->len++; 1954 return (ma); 1955} 1956 1957/* 1958 * Free a mntarg structure 1959 */ 1960static void 1961free_mntarg(struct mntarg *ma) 1962{ 1963 struct mntaarg *maa; 1964 1965 while (!SLIST_EMPTY(&ma->list)) { 1966 maa = SLIST_FIRST(&ma->list); 1967 SLIST_REMOVE_HEAD(&ma->list, next); 1968 free(maa, M_MOUNT); 1969 } 1970 free(ma->v, M_MOUNT); 1971 free(ma, M_MOUNT); 1972} 1973 1974/* 1975 * Mount a filesystem 1976 */ 1977int 1978kernel_mount(struct mntarg *ma, int flags) 1979{ 1980 struct uio auio; 1981 int error; 1982 1983 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1984 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1985 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1986 1987 auio.uio_iov = ma->v; 1988 auio.uio_iovcnt = ma->len; 1989 auio.uio_segflg = UIO_SYSSPACE; 1990 1991 error = ma->error; 1992 if (!error) 1993 error = vfs_donmount(curthread, flags, &auio); 1994 free_mntarg(ma); 1995 return (error); 1996} 1997 1998/* 1999 * A printflike function to mount a filesystem. 2000 */ 2001int 2002kernel_vmount(int flags, ...) 2003{ 2004 struct mntarg *ma = NULL; 2005 va_list ap; 2006 const char *cp; 2007 const void *vp; 2008 int error; 2009 2010 va_start(ap, flags); 2011 for (;;) { 2012 cp = va_arg(ap, const char *); 2013 if (cp == NULL) 2014 break; 2015 vp = va_arg(ap, const void *); 2016 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2017 } 2018 va_end(ap); 2019 2020 error = kernel_mount(ma, flags); 2021 return (error); 2022} 2023 2024void 2025vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2026{ 2027 2028 bcopy(oexp, exp, sizeof(*oexp)); 2029 exp->ex_numsecflavors = 0; 2030} 2031