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