Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_mount.c
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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("$FreeBSD$"); 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 static uma_zone_t mount_zone; 83 84 /* List of mounted filesystems. */ 85 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 86 87 /* For any iteration/modification of mountlist */ 88 struct mtx mountlist_mtx; 89 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 90 91 /* 92 * Global opts, taken by all filesystems 93 */ 94 static const char *global_opts[] = { 95 "errmsg", 96 "fstype", 97 "fspath", 98 "ro", 99 "rw", 100 "nosuid", 101 "noexec", 102 NULL 103 }; 104 105 static int 106 mount_init(void *mem, int size, int flags) 107 { 108 struct mount *mp; 109 110 mp = (struct mount *)mem; 111 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 112 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 113 return (0); 114 } 115 116 static void 117 mount_fini(void *mem, int size) 118 { 119 struct mount *mp; 120 121 mp = (struct mount *)mem; 122 lockdestroy(&mp->mnt_explock); 123 mtx_destroy(&mp->mnt_mtx); 124 } 125 126 static void 127 vfs_mount_init(void *dummy __unused) 128 { 129 130 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 131 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 132 } 133 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 134 135 /* 136 * --------------------------------------------------------------------- 137 * Functions for building and sanitizing the mount options 138 */ 139 140 /* Remove one mount option. */ 141 static void 142 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 143 { 144 145 TAILQ_REMOVE(opts, opt, link); 146 free(opt->name, M_MOUNT); 147 if (opt->value != NULL) 148 free(opt->value, M_MOUNT); 149 free(opt, M_MOUNT); 150 } 151 152 /* Release all resources related to the mount options. */ 153 void 154 vfs_freeopts(struct vfsoptlist *opts) 155 { 156 struct vfsopt *opt; 157 158 while (!TAILQ_EMPTY(opts)) { 159 opt = TAILQ_FIRST(opts); 160 vfs_freeopt(opts, opt); 161 } 162 free(opts, M_MOUNT); 163 } 164 165 void 166 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 167 { 168 struct vfsopt *opt, *temp; 169 170 if (opts == NULL) 171 return; 172 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 173 if (strcmp(opt->name, name) == 0) 174 vfs_freeopt(opts, opt); 175 } 176 } 177 178 static int 179 vfs_isopt_ro(const char *opt) 180 { 181 182 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 183 strcmp(opt, "norw") == 0) 184 return (1); 185 return (0); 186 } 187 188 static int 189 vfs_isopt_rw(const char *opt) 190 { 191 192 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 193 return (1); 194 return (0); 195 } 196 197 /* 198 * Check if options are equal (with or without the "no" prefix). 199 */ 200 static int 201 vfs_equalopts(const char *opt1, const char *opt2) 202 { 203 char *p; 204 205 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 206 if (strcmp(opt1, opt2) == 0) 207 return (1); 208 /* "noopt" vs. "opt" */ 209 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 210 return (1); 211 /* "opt" vs. "noopt" */ 212 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 213 return (1); 214 while ((p = strchr(opt1, '.')) != NULL && 215 !strncmp(opt1, opt2, ++p - opt1)) { 216 opt2 += p - opt1; 217 opt1 = p; 218 /* "foo.noopt" vs. "foo.opt" */ 219 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 220 return (1); 221 /* "foo.opt" vs. "foo.noopt" */ 222 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 223 return (1); 224 } 225 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 226 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 227 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 228 return (1); 229 return (0); 230 } 231 232 /* 233 * If a mount option is specified several times, 234 * (with or without the "no" prefix) only keep 235 * the last occurence of it. 236 */ 237 static void 238 vfs_sanitizeopts(struct vfsoptlist *opts) 239 { 240 struct vfsopt *opt, *opt2, *tmp; 241 242 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 243 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 244 while (opt2 != NULL) { 245 if (vfs_equalopts(opt->name, opt2->name)) { 246 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 247 vfs_freeopt(opts, opt2); 248 opt2 = tmp; 249 } else { 250 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 251 } 252 } 253 } 254 } 255 256 /* 257 * Build a linked list of mount options from a struct uio. 258 */ 259 int 260 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 261 { 262 struct vfsoptlist *opts; 263 struct vfsopt *opt; 264 size_t memused, namelen, optlen; 265 unsigned int i, iovcnt; 266 int error; 267 268 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 269 TAILQ_INIT(opts); 270 memused = 0; 271 iovcnt = auio->uio_iovcnt; 272 for (i = 0; i < iovcnt; i += 2) { 273 namelen = auio->uio_iov[i].iov_len; 274 optlen = auio->uio_iov[i + 1].iov_len; 275 memused += sizeof(struct vfsopt) + optlen + namelen; 276 /* 277 * Avoid consuming too much memory, and attempts to overflow 278 * memused. 279 */ 280 if (memused > VFS_MOUNTARG_SIZE_MAX || 281 optlen > VFS_MOUNTARG_SIZE_MAX || 282 namelen > VFS_MOUNTARG_SIZE_MAX) { 283 error = EINVAL; 284 goto bad; 285 } 286 287 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 288 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 289 opt->value = NULL; 290 opt->len = 0; 291 opt->pos = i / 2; 292 opt->seen = 0; 293 294 /* 295 * Do this early, so jumps to "bad" will free the current 296 * option. 297 */ 298 TAILQ_INSERT_TAIL(opts, opt, link); 299 300 if (auio->uio_segflg == UIO_SYSSPACE) { 301 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 302 } else { 303 error = copyin(auio->uio_iov[i].iov_base, opt->name, 304 namelen); 305 if (error) 306 goto bad; 307 } 308 /* Ensure names are null-terminated strings. */ 309 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 310 error = EINVAL; 311 goto bad; 312 } 313 if (optlen != 0) { 314 opt->len = optlen; 315 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 316 if (auio->uio_segflg == UIO_SYSSPACE) { 317 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 318 optlen); 319 } else { 320 error = copyin(auio->uio_iov[i + 1].iov_base, 321 opt->value, optlen); 322 if (error) 323 goto bad; 324 } 325 } 326 } 327 vfs_sanitizeopts(opts); 328 *options = opts; 329 return (0); 330 bad: 331 vfs_freeopts(opts); 332 return (error); 333 } 334 335 /* 336 * Merge the old mount options with the new ones passed 337 * in the MNT_UPDATE case. 338 * 339 * XXX: This function will keep a "nofoo" option in the new 340 * options. E.g, if the option's canonical name is "foo", 341 * "nofoo" ends up in the mount point's active options. 342 */ 343 static void 344 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 345 { 346 struct vfsopt *opt, *new; 347 348 TAILQ_FOREACH(opt, oldopts, link) { 349 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 350 new->name = strdup(opt->name, M_MOUNT); 351 if (opt->len != 0) { 352 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 353 bcopy(opt->value, new->value, opt->len); 354 } else 355 new->value = NULL; 356 new->len = opt->len; 357 new->seen = opt->seen; 358 TAILQ_INSERT_HEAD(toopts, new, link); 359 } 360 vfs_sanitizeopts(toopts); 361 } 362 363 /* 364 * Mount a filesystem. 365 */ 366 int 367 sys_nmount(td, uap) 368 struct thread *td; 369 struct nmount_args /* { 370 struct iovec *iovp; 371 unsigned int iovcnt; 372 int flags; 373 } */ *uap; 374 { 375 struct uio *auio; 376 int error; 377 u_int iovcnt; 378 uint64_t flags; 379 380 /* 381 * Mount flags are now 64-bits. On 32-bit archtectures only 382 * 32-bits are passed in, but from here on everything handles 383 * 64-bit flags correctly. 384 */ 385 flags = uap->flags; 386 387 AUDIT_ARG_FFLAGS(flags); 388 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 389 uap->iovp, uap->iovcnt, flags); 390 391 /* 392 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 393 * userspace to set this flag, but we must filter it out if we want 394 * MNT_UPDATE on the root file system to work. 395 * MNT_ROOTFS should only be set by the kernel when mounting its 396 * root file system. 397 */ 398 flags &= ~MNT_ROOTFS; 399 400 iovcnt = uap->iovcnt; 401 /* 402 * Check that we have an even number of iovec's 403 * and that we have at least two options. 404 */ 405 if ((iovcnt & 1) || (iovcnt < 4)) { 406 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 407 uap->iovcnt); 408 return (EINVAL); 409 } 410 411 error = copyinuio(uap->iovp, iovcnt, &auio); 412 if (error) { 413 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 414 __func__, error); 415 return (error); 416 } 417 error = vfs_donmount(td, flags, auio); 418 419 free(auio, M_IOV); 420 return (error); 421 } 422 423 /* 424 * --------------------------------------------------------------------- 425 * Various utility functions 426 */ 427 428 void 429 vfs_ref(struct mount *mp) 430 { 431 432 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 433 MNT_ILOCK(mp); 434 MNT_REF(mp); 435 MNT_IUNLOCK(mp); 436 } 437 438 void 439 vfs_rel(struct mount *mp) 440 { 441 442 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 443 MNT_ILOCK(mp); 444 MNT_REL(mp); 445 MNT_IUNLOCK(mp); 446 } 447 448 /* 449 * Allocate and initialize the mount point struct. 450 */ 451 struct mount * 452 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 453 struct ucred *cred) 454 { 455 struct mount *mp; 456 457 mp = uma_zalloc(mount_zone, M_WAITOK); 458 bzero(&mp->mnt_startzero, 459 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 460 TAILQ_INIT(&mp->mnt_nvnodelist); 461 mp->mnt_nvnodelistsize = 0; 462 TAILQ_INIT(&mp->mnt_activevnodelist); 463 mp->mnt_activevnodelistsize = 0; 464 mp->mnt_ref = 0; 465 (void) vfs_busy(mp, MBF_NOWAIT); 466 mp->mnt_op = vfsp->vfc_vfsops; 467 mp->mnt_vfc = vfsp; 468 vfsp->vfc_refcount++; /* XXX Unlocked */ 469 mp->mnt_stat.f_type = vfsp->vfc_typenum; 470 mp->mnt_gen++; 471 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 472 mp->mnt_vnodecovered = vp; 473 mp->mnt_cred = crdup(cred); 474 mp->mnt_stat.f_owner = cred->cr_uid; 475 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 476 mp->mnt_iosize_max = DFLTPHYS; 477 #ifdef MAC 478 mac_mount_init(mp); 479 mac_mount_create(cred, mp); 480 #endif 481 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 482 TAILQ_INIT(&mp->mnt_uppers); 483 return (mp); 484 } 485 486 /* 487 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 488 */ 489 void 490 vfs_mount_destroy(struct mount *mp) 491 { 492 493 MNT_ILOCK(mp); 494 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 495 if (mp->mnt_kern_flag & MNTK_MWAIT) { 496 mp->mnt_kern_flag &= ~MNTK_MWAIT; 497 wakeup(mp); 498 } 499 while (mp->mnt_ref) 500 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 501 KASSERT(mp->mnt_ref == 0, 502 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 503 __FILE__, __LINE__)); 504 if (mp->mnt_writeopcount != 0) 505 panic("vfs_mount_destroy: nonzero writeopcount"); 506 if (mp->mnt_secondary_writes != 0) 507 panic("vfs_mount_destroy: nonzero secondary_writes"); 508 mp->mnt_vfc->vfc_refcount--; 509 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 510 struct vnode *vp; 511 512 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 513 vprint("", vp); 514 panic("unmount: dangling vnode"); 515 } 516 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 517 if (mp->mnt_nvnodelistsize != 0) 518 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 519 if (mp->mnt_activevnodelistsize != 0) 520 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 521 if (mp->mnt_lockref != 0) 522 panic("vfs_mount_destroy: nonzero lock refcount"); 523 MNT_IUNLOCK(mp); 524 #ifdef MAC 525 mac_mount_destroy(mp); 526 #endif 527 if (mp->mnt_opt != NULL) 528 vfs_freeopts(mp->mnt_opt); 529 crfree(mp->mnt_cred); 530 uma_zfree(mount_zone, mp); 531 } 532 533 int 534 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 535 { 536 struct vfsoptlist *optlist; 537 struct vfsopt *opt, *tmp_opt; 538 char *fstype, *fspath, *errmsg; 539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 540 541 errmsg = fspath = NULL; 542 errmsg_len = fspathlen = 0; 543 errmsg_pos = -1; 544 545 error = vfs_buildopts(fsoptions, &optlist); 546 if (error) 547 return (error); 548 549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 551 552 /* 553 * We need these two options before the others, 554 * and they are mandatory for any filesystem. 555 * Ensure they are NUL terminated as well. 556 */ 557 fstypelen = 0; 558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 559 if (error || fstype[fstypelen - 1] != '\0') { 560 error = EINVAL; 561 if (errmsg != NULL) 562 strncpy(errmsg, "Invalid fstype", errmsg_len); 563 goto bail; 564 } 565 fspathlen = 0; 566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 567 if (error || fspath[fspathlen - 1] != '\0') { 568 error = EINVAL; 569 if (errmsg != NULL) 570 strncpy(errmsg, "Invalid fspath", errmsg_len); 571 goto bail; 572 } 573 574 /* 575 * We need to see if we have the "update" option 576 * before we call vfs_domount(), since vfs_domount() has special 577 * logic based on MNT_UPDATE. This is very important 578 * when we want to update the root filesystem. 579 */ 580 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 581 if (strcmp(opt->name, "update") == 0) { 582 fsflags |= MNT_UPDATE; 583 vfs_freeopt(optlist, opt); 584 } 585 else if (strcmp(opt->name, "async") == 0) 586 fsflags |= MNT_ASYNC; 587 else if (strcmp(opt->name, "force") == 0) { 588 fsflags |= MNT_FORCE; 589 vfs_freeopt(optlist, opt); 590 } 591 else if (strcmp(opt->name, "reload") == 0) { 592 fsflags |= MNT_RELOAD; 593 vfs_freeopt(optlist, opt); 594 } 595 else if (strcmp(opt->name, "multilabel") == 0) 596 fsflags |= MNT_MULTILABEL; 597 else if (strcmp(opt->name, "noasync") == 0) 598 fsflags &= ~MNT_ASYNC; 599 else if (strcmp(opt->name, "noatime") == 0) 600 fsflags |= MNT_NOATIME; 601 else if (strcmp(opt->name, "atime") == 0) { 602 free(opt->name, M_MOUNT); 603 opt->name = strdup("nonoatime", M_MOUNT); 604 } 605 else if (strcmp(opt->name, "noclusterr") == 0) 606 fsflags |= MNT_NOCLUSTERR; 607 else if (strcmp(opt->name, "clusterr") == 0) { 608 free(opt->name, M_MOUNT); 609 opt->name = strdup("nonoclusterr", M_MOUNT); 610 } 611 else if (strcmp(opt->name, "noclusterw") == 0) 612 fsflags |= MNT_NOCLUSTERW; 613 else if (strcmp(opt->name, "clusterw") == 0) { 614 free(opt->name, M_MOUNT); 615 opt->name = strdup("nonoclusterw", M_MOUNT); 616 } 617 else if (strcmp(opt->name, "noexec") == 0) 618 fsflags |= MNT_NOEXEC; 619 else if (strcmp(opt->name, "exec") == 0) { 620 free(opt->name, M_MOUNT); 621 opt->name = strdup("nonoexec", M_MOUNT); 622 } 623 else if (strcmp(opt->name, "nosuid") == 0) 624 fsflags |= MNT_NOSUID; 625 else if (strcmp(opt->name, "suid") == 0) { 626 free(opt->name, M_MOUNT); 627 opt->name = strdup("nonosuid", M_MOUNT); 628 } 629 else if (strcmp(opt->name, "nosymfollow") == 0) 630 fsflags |= MNT_NOSYMFOLLOW; 631 else if (strcmp(opt->name, "symfollow") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("nonosymfollow", M_MOUNT); 634 } 635 else if (strcmp(opt->name, "noro") == 0) 636 fsflags &= ~MNT_RDONLY; 637 else if (strcmp(opt->name, "rw") == 0) 638 fsflags &= ~MNT_RDONLY; 639 else if (strcmp(opt->name, "ro") == 0) 640 fsflags |= MNT_RDONLY; 641 else if (strcmp(opt->name, "rdonly") == 0) { 642 free(opt->name, M_MOUNT); 643 opt->name = strdup("ro", M_MOUNT); 644 fsflags |= MNT_RDONLY; 645 } 646 else if (strcmp(opt->name, "suiddir") == 0) 647 fsflags |= MNT_SUIDDIR; 648 else if (strcmp(opt->name, "sync") == 0) 649 fsflags |= MNT_SYNCHRONOUS; 650 else if (strcmp(opt->name, "union") == 0) 651 fsflags |= MNT_UNION; 652 } 653 654 /* 655 * Be ultra-paranoid about making sure the type and fspath 656 * variables will fit in our mp buffers, including the 657 * terminating NUL. 658 */ 659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 660 error = ENAMETOOLONG; 661 goto bail; 662 } 663 664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 665 bail: 666 /* copyout the errmsg */ 667 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 668 && errmsg_len > 0 && errmsg != NULL) { 669 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 670 bcopy(errmsg, 671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 673 } else { 674 copyout(errmsg, 675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 677 } 678 } 679 680 if (optlist != NULL) 681 vfs_freeopts(optlist); 682 return (error); 683 } 684 685 /* 686 * Old mount API. 687 */ 688 #ifndef _SYS_SYSPROTO_H_ 689 struct mount_args { 690 char *type; 691 char *path; 692 int flags; 693 caddr_t data; 694 }; 695 #endif 696 /* ARGSUSED */ 697 int 698 sys_mount(td, uap) 699 struct thread *td; 700 struct mount_args /* { 701 char *type; 702 char *path; 703 int flags; 704 caddr_t data; 705 } */ *uap; 706 { 707 char *fstype; 708 struct vfsconf *vfsp = NULL; 709 struct mntarg *ma = NULL; 710 uint64_t flags; 711 int error; 712 713 /* 714 * Mount flags are now 64-bits. On 32-bit architectures only 715 * 32-bits are passed in, but from here on everything handles 716 * 64-bit flags correctly. 717 */ 718 flags = uap->flags; 719 720 AUDIT_ARG_FFLAGS(flags); 721 722 /* 723 * Filter out MNT_ROOTFS. We do not want clients of mount() in 724 * userspace to set this flag, but we must filter it out if we want 725 * MNT_UPDATE on the root file system to work. 726 * MNT_ROOTFS should only be set by the kernel when mounting its 727 * root file system. 728 */ 729 flags &= ~MNT_ROOTFS; 730 731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 733 if (error) { 734 free(fstype, M_TEMP); 735 return (error); 736 } 737 738 AUDIT_ARG_TEXT(fstype); 739 mtx_lock(&Giant); 740 vfsp = vfs_byname_kld(fstype, td, &error); 741 free(fstype, M_TEMP); 742 if (vfsp == NULL) { 743 mtx_unlock(&Giant); 744 return (ENOENT); 745 } 746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 747 mtx_unlock(&Giant); 748 return (EOPNOTSUPP); 749 } 750 751 ma = mount_argsu(ma, "fstype", uap->type, 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 mtx_unlock(&Giant); 759 return (error); 760 } 761 762 /* 763 * vfs_domount_first(): first file system mount (not update) 764 */ 765 static int 766 vfs_domount_first( 767 struct thread *td, /* Calling thread. */ 768 struct vfsconf *vfsp, /* File system type. */ 769 char *fspath, /* Mount path. */ 770 struct vnode *vp, /* Vnode to be covered. */ 771 uint64_t fsflags, /* Flags common to all filesystems. */ 772 struct vfsoptlist **optlist /* Options local to the filesystem. */ 773 ) 774 { 775 struct vattr va; 776 struct mount *mp; 777 struct vnode *newdp; 778 int error; 779 780 mtx_assert(&Giant, MA_OWNED); 781 ASSERT_VOP_ELOCKED(vp, __func__); 782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 783 784 /* 785 * If the user is not root, ensure that they own the directory 786 * onto which we are attempting to mount. 787 */ 788 error = VOP_GETATTR(vp, &va, td->td_ucred); 789 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 790 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 791 if (error == 0) 792 error = vinvalbuf(vp, V_SAVE, 0, 0); 793 if (error == 0 && vp->v_type != VDIR) 794 error = ENOTDIR; 795 if (error == 0) { 796 VI_LOCK(vp); 797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 798 vp->v_iflag |= VI_MOUNT; 799 else 800 error = EBUSY; 801 VI_UNLOCK(vp); 802 } 803 if (error != 0) { 804 vput(vp); 805 return (error); 806 } 807 VOP_UNLOCK(vp, 0); 808 809 /* Allocate and initialize the filesystem. */ 810 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 811 /* XXXMAC: pass to vfs_mount_alloc? */ 812 mp->mnt_optnew = *optlist; 813 /* Set the mount level flags. */ 814 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 815 816 /* 817 * Mount the filesystem. 818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 819 * get. No freeing of cn_pnbuf. 820 */ 821 error = VFS_MOUNT(mp); 822 if (error != 0) { 823 vfs_unbusy(mp); 824 vfs_mount_destroy(mp); 825 VI_LOCK(vp); 826 vp->v_iflag &= ~VI_MOUNT; 827 VI_UNLOCK(vp); 828 vrele(vp); 829 return (error); 830 } 831 832 if (mp->mnt_opt != NULL) 833 vfs_freeopts(mp->mnt_opt); 834 mp->mnt_opt = mp->mnt_optnew; 835 *optlist = NULL; 836 (void)VFS_STATFS(mp, &mp->mnt_stat); 837 838 /* 839 * Prevent external consumers of mount options from reading mnt_optnew. 840 */ 841 mp->mnt_optnew = NULL; 842 843 MNT_ILOCK(mp); 844 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 845 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 846 mp->mnt_kern_flag |= MNTK_ASYNC; 847 else 848 mp->mnt_kern_flag &= ~MNTK_ASYNC; 849 MNT_IUNLOCK(mp); 850 851 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 852 cache_purge(vp); 853 VI_LOCK(vp); 854 vp->v_iflag &= ~VI_MOUNT; 855 VI_UNLOCK(vp); 856 vp->v_mountedhere = mp; 857 /* Place the new filesystem at the end of the mount list. */ 858 mtx_lock(&mountlist_mtx); 859 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 860 mtx_unlock(&mountlist_mtx); 861 vfs_event_signal(NULL, VQ_MOUNT, 0); 862 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 863 panic("mount: lost mount"); 864 VOP_UNLOCK(newdp, 0); 865 VOP_UNLOCK(vp, 0); 866 mountcheckdirs(vp, newdp); 867 vrele(newdp); 868 if ((mp->mnt_flag & MNT_RDONLY) == 0) 869 vfs_allocate_syncvnode(mp); 870 vfs_unbusy(mp); 871 return (0); 872 } 873 874 /* 875 * vfs_domount_update(): update of mounted file system 876 */ 877 static int 878 vfs_domount_update( 879 struct thread *td, /* Calling thread. */ 880 struct vnode *vp, /* Mount point vnode. */ 881 uint64_t fsflags, /* Flags common to all filesystems. */ 882 struct vfsoptlist **optlist /* Options local to the filesystem. */ 883 ) 884 { 885 struct oexport_args oexport; 886 struct export_args export; 887 struct mount *mp; 888 int error, export_error; 889 uint64_t flag; 890 891 mtx_assert(&Giant, MA_OWNED); 892 ASSERT_VOP_ELOCKED(vp, __func__); 893 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 894 895 if ((vp->v_vflag & VV_ROOT) == 0) { 896 vput(vp); 897 return (EINVAL); 898 } 899 mp = vp->v_mount; 900 /* 901 * We only allow the filesystem to be reloaded if it 902 * is currently mounted read-only. 903 */ 904 flag = mp->mnt_flag; 905 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 906 vput(vp); 907 return (EOPNOTSUPP); /* Needs translation */ 908 } 909 /* 910 * Only privileged root, or (if MNT_USER is set) the user that 911 * did the original mount is permitted to update it. 912 */ 913 error = vfs_suser(mp, td); 914 if (error != 0) { 915 vput(vp); 916 return (error); 917 } 918 if (vfs_busy(mp, MBF_NOWAIT)) { 919 vput(vp); 920 return (EBUSY); 921 } 922 VI_LOCK(vp); 923 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 924 VI_UNLOCK(vp); 925 vfs_unbusy(mp); 926 vput(vp); 927 return (EBUSY); 928 } 929 vp->v_iflag |= VI_MOUNT; 930 VI_UNLOCK(vp); 931 VOP_UNLOCK(vp, 0); 932 933 MNT_ILOCK(mp); 934 mp->mnt_flag &= ~MNT_UPDATEMASK; 935 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 936 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 937 if ((mp->mnt_flag & MNT_ASYNC) == 0) 938 mp->mnt_kern_flag &= ~MNTK_ASYNC; 939 MNT_IUNLOCK(mp); 940 mp->mnt_optnew = *optlist; 941 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 942 943 /* 944 * Mount the filesystem. 945 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 946 * get. No freeing of cn_pnbuf. 947 */ 948 error = VFS_MOUNT(mp); 949 950 export_error = 0; 951 if (error == 0) { 952 /* Process the export option. */ 953 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 954 sizeof(export)) == 0) { 955 export_error = vfs_export(mp, &export); 956 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 957 sizeof(oexport)) == 0) { 958 export.ex_flags = oexport.ex_flags; 959 export.ex_root = oexport.ex_root; 960 export.ex_anon = oexport.ex_anon; 961 export.ex_addr = oexport.ex_addr; 962 export.ex_addrlen = oexport.ex_addrlen; 963 export.ex_mask = oexport.ex_mask; 964 export.ex_masklen = oexport.ex_masklen; 965 export.ex_indexfile = oexport.ex_indexfile; 966 export.ex_numsecflavors = 0; 967 export_error = vfs_export(mp, &export); 968 } 969 } 970 971 MNT_ILOCK(mp); 972 if (error == 0) { 973 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 974 MNT_SNAPSHOT); 975 } else { 976 /* 977 * If we fail, restore old mount flags. MNT_QUOTA is special, 978 * because it is not part of MNT_UPDATEMASK, but it could have 979 * changed in the meantime if quotactl(2) was called. 980 * All in all we want current value of MNT_QUOTA, not the old 981 * one. 982 */ 983 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 984 } 985 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 986 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 987 mp->mnt_kern_flag |= MNTK_ASYNC; 988 else 989 mp->mnt_kern_flag &= ~MNTK_ASYNC; 990 MNT_IUNLOCK(mp); 991 992 if (error != 0) 993 goto end; 994 995 if (mp->mnt_opt != NULL) 996 vfs_freeopts(mp->mnt_opt); 997 mp->mnt_opt = mp->mnt_optnew; 998 *optlist = NULL; 999 (void)VFS_STATFS(mp, &mp->mnt_stat); 1000 /* 1001 * Prevent external consumers of mount options from reading 1002 * mnt_optnew. 1003 */ 1004 mp->mnt_optnew = NULL; 1005 1006 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1007 vfs_allocate_syncvnode(mp); 1008 else 1009 vfs_deallocate_syncvnode(mp); 1010 end: 1011 vfs_unbusy(mp); 1012 VI_LOCK(vp); 1013 vp->v_iflag &= ~VI_MOUNT; 1014 VI_UNLOCK(vp); 1015 vrele(vp); 1016 return (error != 0 ? error : export_error); 1017 } 1018 1019 /* 1020 * vfs_domount(): actually attempt a filesystem mount. 1021 */ 1022 static int 1023 vfs_domount( 1024 struct thread *td, /* Calling thread. */ 1025 const char *fstype, /* Filesystem type. */ 1026 char *fspath, /* Mount path. */ 1027 uint64_t fsflags, /* Flags common to all filesystems. */ 1028 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1029 ) 1030 { 1031 struct vfsconf *vfsp; 1032 struct nameidata nd; 1033 struct vnode *vp; 1034 char *pathbuf; 1035 int error; 1036 1037 /* 1038 * Be ultra-paranoid about making sure the type and fspath 1039 * variables will fit in our mp buffers, including the 1040 * terminating NUL. 1041 */ 1042 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1043 return (ENAMETOOLONG); 1044 1045 if (jailed(td->td_ucred) || usermount == 0) { 1046 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1047 return (error); 1048 } 1049 1050 /* 1051 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1052 */ 1053 if (fsflags & MNT_EXPORTED) { 1054 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1055 if (error) 1056 return (error); 1057 } 1058 if (fsflags & MNT_SUIDDIR) { 1059 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1060 if (error) 1061 return (error); 1062 } 1063 /* 1064 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1065 */ 1066 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1067 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1068 fsflags |= MNT_NOSUID | MNT_USER; 1069 } 1070 1071 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1072 vfsp = NULL; 1073 if ((fsflags & MNT_UPDATE) == 0) { 1074 /* Don't try to load KLDs if we're mounting the root. */ 1075 if (fsflags & MNT_ROOTFS) 1076 vfsp = vfs_byname(fstype); 1077 else 1078 vfsp = vfs_byname_kld(fstype, td, &error); 1079 if (vfsp == NULL) 1080 return (ENODEV); 1081 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1082 return (EPERM); 1083 } 1084 1085 /* 1086 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1087 */ 1088 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1089 UIO_SYSSPACE, fspath, td); 1090 error = namei(&nd); 1091 if (error != 0) 1092 return (error); 1093 if (!NDHASGIANT(&nd)) 1094 mtx_lock(&Giant); 1095 NDFREE(&nd, NDF_ONLY_PNBUF); 1096 vp = nd.ni_vp; 1097 if ((fsflags & MNT_UPDATE) == 0) { 1098 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1099 strcpy(pathbuf, fspath); 1100 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1101 /* debug.disablefullpath == 1 results in ENODEV */ 1102 if (error == 0 || error == ENODEV) { 1103 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1104 fsflags, optlist); 1105 } 1106 free(pathbuf, M_TEMP); 1107 } else 1108 error = vfs_domount_update(td, vp, fsflags, optlist); 1109 mtx_unlock(&Giant); 1110 1111 ASSERT_VI_UNLOCKED(vp, __func__); 1112 ASSERT_VOP_UNLOCKED(vp, __func__); 1113 1114 return (error); 1115 } 1116 1117 /* 1118 * Unmount a filesystem. 1119 * 1120 * Note: unmount takes a path to the vnode mounted on as argument, not 1121 * special file (as before). 1122 */ 1123 #ifndef _SYS_SYSPROTO_H_ 1124 struct unmount_args { 1125 char *path; 1126 int flags; 1127 }; 1128 #endif 1129 /* ARGSUSED */ 1130 int 1131 sys_unmount(td, uap) 1132 struct thread *td; 1133 register struct unmount_args /* { 1134 char *path; 1135 int flags; 1136 } */ *uap; 1137 { 1138 struct nameidata nd; 1139 struct mount *mp; 1140 char *pathbuf; 1141 int error, id0, id1, vfslocked; 1142 1143 AUDIT_ARG_VALUE(uap->flags); 1144 if (jailed(td->td_ucred) || usermount == 0) { 1145 error = priv_check(td, PRIV_VFS_UNMOUNT); 1146 if (error) 1147 return (error); 1148 } 1149 1150 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1151 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1152 if (error) { 1153 free(pathbuf, M_TEMP); 1154 return (error); 1155 } 1156 mtx_lock(&Giant); 1157 if (uap->flags & MNT_BYFSID) { 1158 AUDIT_ARG_TEXT(pathbuf); 1159 /* Decode the filesystem ID. */ 1160 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1161 mtx_unlock(&Giant); 1162 free(pathbuf, M_TEMP); 1163 return (EINVAL); 1164 } 1165 1166 mtx_lock(&mountlist_mtx); 1167 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1168 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1169 mp->mnt_stat.f_fsid.val[1] == id1) 1170 break; 1171 } 1172 mtx_unlock(&mountlist_mtx); 1173 } else { 1174 /* 1175 * Try to find global path for path argument. 1176 */ 1177 NDINIT(&nd, LOOKUP, 1178 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1179 UIO_SYSSPACE, pathbuf, td); 1180 if (namei(&nd) == 0) { 1181 vfslocked = NDHASGIANT(&nd); 1182 NDFREE(&nd, NDF_ONLY_PNBUF); 1183 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1184 MNAMELEN); 1185 if (error == 0 || error == ENODEV) 1186 vput(nd.ni_vp); 1187 VFS_UNLOCK_GIANT(vfslocked); 1188 } 1189 mtx_lock(&mountlist_mtx); 1190 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1191 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1192 break; 1193 } 1194 mtx_unlock(&mountlist_mtx); 1195 } 1196 free(pathbuf, M_TEMP); 1197 if (mp == NULL) { 1198 /* 1199 * Previously we returned ENOENT for a nonexistent path and 1200 * EINVAL for a non-mountpoint. We cannot tell these apart 1201 * now, so in the !MNT_BYFSID case return the more likely 1202 * EINVAL for compatibility. 1203 */ 1204 mtx_unlock(&Giant); 1205 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1206 } 1207 1208 /* 1209 * Don't allow unmounting the root filesystem. 1210 */ 1211 if (mp->mnt_flag & MNT_ROOTFS) { 1212 mtx_unlock(&Giant); 1213 return (EINVAL); 1214 } 1215 error = dounmount(mp, uap->flags, td); 1216 mtx_unlock(&Giant); 1217 return (error); 1218 } 1219 1220 /* 1221 * Do the actual filesystem unmount. 1222 */ 1223 int 1224 dounmount(mp, flags, td) 1225 struct mount *mp; 1226 int flags; 1227 struct thread *td; 1228 { 1229 struct vnode *coveredvp, *fsrootvp; 1230 int error; 1231 uint64_t async_flag; 1232 int mnt_gen_r; 1233 1234 mtx_assert(&Giant, MA_OWNED); 1235 1236 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1237 mnt_gen_r = mp->mnt_gen; 1238 VI_LOCK(coveredvp); 1239 vholdl(coveredvp); 1240 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1241 vdrop(coveredvp); 1242 /* 1243 * Check for mp being unmounted while waiting for the 1244 * covered vnode lock. 1245 */ 1246 if (coveredvp->v_mountedhere != mp || 1247 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1248 VOP_UNLOCK(coveredvp, 0); 1249 return (EBUSY); 1250 } 1251 } 1252 /* 1253 * Only privileged root, or (if MNT_USER is set) the user that did the 1254 * original mount is permitted to unmount this filesystem. 1255 */ 1256 error = vfs_suser(mp, td); 1257 if (error) { 1258 if (coveredvp) 1259 VOP_UNLOCK(coveredvp, 0); 1260 return (error); 1261 } 1262 1263 vn_start_write(NULL, &mp, V_WAIT); 1264 MNT_ILOCK(mp); 1265 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1266 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1267 MNT_IUNLOCK(mp); 1268 if (coveredvp) 1269 VOP_UNLOCK(coveredvp, 0); 1270 vn_finished_write(mp); 1271 return (EBUSY); 1272 } 1273 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1274 /* Allow filesystems to detect that a forced unmount is in progress. */ 1275 if (flags & MNT_FORCE) 1276 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1277 error = 0; 1278 if (mp->mnt_lockref) { 1279 mp->mnt_kern_flag |= MNTK_DRAINING; 1280 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1281 "mount drain", 0); 1282 } 1283 MNT_IUNLOCK(mp); 1284 KASSERT(mp->mnt_lockref == 0, 1285 ("%s: invalid lock refcount in the drain path @ %s:%d", 1286 __func__, __FILE__, __LINE__)); 1287 KASSERT(error == 0, 1288 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1289 __func__, __FILE__, __LINE__)); 1290 1291 if (mp->mnt_flag & MNT_EXPUBLIC) 1292 vfs_setpublicfs(NULL, NULL, NULL); 1293 1294 vfs_msync(mp, MNT_WAIT); 1295 MNT_ILOCK(mp); 1296 async_flag = mp->mnt_flag & MNT_ASYNC; 1297 mp->mnt_flag &= ~MNT_ASYNC; 1298 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1299 MNT_IUNLOCK(mp); 1300 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1301 vfs_deallocate_syncvnode(mp); 1302 /* 1303 * For forced unmounts, move process cdir/rdir refs on the fs root 1304 * vnode to the covered vnode. For non-forced unmounts we want 1305 * such references to cause an EBUSY error. 1306 */ 1307 if ((flags & MNT_FORCE) && 1308 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1309 if (mp->mnt_vnodecovered != NULL && 1310 (mp->mnt_flag & MNT_IGNORE) == 0) 1311 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1312 if (fsrootvp == rootvnode) { 1313 vrele(rootvnode); 1314 rootvnode = NULL; 1315 } 1316 vput(fsrootvp); 1317 } 1318 if (((mp->mnt_flag & MNT_RDONLY) || 1319 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1320 error = VFS_UNMOUNT(mp, flags); 1321 vn_finished_write(mp); 1322 /* 1323 * If we failed to flush the dirty blocks for this mount point, 1324 * undo all the cdir/rdir and rootvnode changes we made above. 1325 * Unless we failed to do so because the device is reporting that 1326 * it doesn't exist anymore. 1327 */ 1328 if (error && error != ENXIO) { 1329 if ((flags & MNT_FORCE) && 1330 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1331 if (mp->mnt_vnodecovered != NULL && 1332 (mp->mnt_flag & MNT_IGNORE) == 0) 1333 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1334 if (rootvnode == NULL) { 1335 rootvnode = fsrootvp; 1336 vref(rootvnode); 1337 } 1338 vput(fsrootvp); 1339 } 1340 MNT_ILOCK(mp); 1341 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1342 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1343 MNT_IUNLOCK(mp); 1344 vfs_allocate_syncvnode(mp); 1345 MNT_ILOCK(mp); 1346 } 1347 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1348 mp->mnt_flag |= async_flag; 1349 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1350 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1351 mp->mnt_kern_flag |= MNTK_ASYNC; 1352 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1353 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1354 wakeup(mp); 1355 } 1356 MNT_IUNLOCK(mp); 1357 if (coveredvp) 1358 VOP_UNLOCK(coveredvp, 0); 1359 return (error); 1360 } 1361 mtx_lock(&mountlist_mtx); 1362 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1363 mtx_unlock(&mountlist_mtx); 1364 if (coveredvp != NULL) { 1365 coveredvp->v_mountedhere = NULL; 1366 vput(coveredvp); 1367 } 1368 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1369 vfs_mount_destroy(mp); 1370 return (0); 1371 } 1372 1373 /* 1374 * Report errors during filesystem mounting. 1375 */ 1376 void 1377 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1378 { 1379 struct vfsoptlist *moptlist = mp->mnt_optnew; 1380 va_list ap; 1381 int error, len; 1382 char *errmsg; 1383 1384 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1385 if (error || errmsg == NULL || len <= 0) 1386 return; 1387 1388 va_start(ap, fmt); 1389 vsnprintf(errmsg, (size_t)len, fmt, ap); 1390 va_end(ap); 1391 } 1392 1393 void 1394 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1395 { 1396 va_list ap; 1397 int error, len; 1398 char *errmsg; 1399 1400 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1401 if (error || errmsg == NULL || len <= 0) 1402 return; 1403 1404 va_start(ap, fmt); 1405 vsnprintf(errmsg, (size_t)len, fmt, ap); 1406 va_end(ap); 1407 } 1408 1409 /* 1410 * --------------------------------------------------------------------- 1411 * Functions for querying mount options/arguments from filesystems. 1412 */ 1413 1414 /* 1415 * Check that no unknown options are given 1416 */ 1417 int 1418 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1419 { 1420 struct vfsopt *opt; 1421 char errmsg[255]; 1422 const char **t, *p, *q; 1423 int ret = 0; 1424 1425 TAILQ_FOREACH(opt, opts, link) { 1426 p = opt->name; 1427 q = NULL; 1428 if (p[0] == 'n' && p[1] == 'o') 1429 q = p + 2; 1430 for(t = global_opts; *t != NULL; t++) { 1431 if (strcmp(*t, p) == 0) 1432 break; 1433 if (q != NULL) { 1434 if (strcmp(*t, q) == 0) 1435 break; 1436 } 1437 } 1438 if (*t != NULL) 1439 continue; 1440 for(t = legal; *t != NULL; t++) { 1441 if (strcmp(*t, p) == 0) 1442 break; 1443 if (q != NULL) { 1444 if (strcmp(*t, q) == 0) 1445 break; 1446 } 1447 } 1448 if (*t != NULL) 1449 continue; 1450 snprintf(errmsg, sizeof(errmsg), 1451 "mount option <%s> is unknown", p); 1452 ret = EINVAL; 1453 } 1454 if (ret != 0) { 1455 TAILQ_FOREACH(opt, opts, link) { 1456 if (strcmp(opt->name, "errmsg") == 0) { 1457 strncpy((char *)opt->value, errmsg, opt->len); 1458 break; 1459 } 1460 } 1461 if (opt == NULL) 1462 printf("%s\n", errmsg); 1463 } 1464 return (ret); 1465 } 1466 1467 /* 1468 * Get a mount option by its name. 1469 * 1470 * Return 0 if the option was found, ENOENT otherwise. 1471 * If len is non-NULL it will be filled with the length 1472 * of the option. If buf is non-NULL, it will be filled 1473 * with the address of the option. 1474 */ 1475 int 1476 vfs_getopt(opts, name, buf, len) 1477 struct vfsoptlist *opts; 1478 const char *name; 1479 void **buf; 1480 int *len; 1481 { 1482 struct vfsopt *opt; 1483 1484 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1485 1486 TAILQ_FOREACH(opt, opts, link) { 1487 if (strcmp(name, opt->name) == 0) { 1488 opt->seen = 1; 1489 if (len != NULL) 1490 *len = opt->len; 1491 if (buf != NULL) 1492 *buf = opt->value; 1493 return (0); 1494 } 1495 } 1496 return (ENOENT); 1497 } 1498 1499 int 1500 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1501 { 1502 struct vfsopt *opt; 1503 1504 if (opts == NULL) 1505 return (-1); 1506 1507 TAILQ_FOREACH(opt, opts, link) { 1508 if (strcmp(name, opt->name) == 0) { 1509 opt->seen = 1; 1510 return (opt->pos); 1511 } 1512 } 1513 return (-1); 1514 } 1515 1516 char * 1517 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1518 { 1519 struct vfsopt *opt; 1520 1521 *error = 0; 1522 TAILQ_FOREACH(opt, opts, link) { 1523 if (strcmp(name, opt->name) != 0) 1524 continue; 1525 opt->seen = 1; 1526 if (opt->len == 0 || 1527 ((char *)opt->value)[opt->len - 1] != '\0') { 1528 *error = EINVAL; 1529 return (NULL); 1530 } 1531 return (opt->value); 1532 } 1533 *error = ENOENT; 1534 return (NULL); 1535 } 1536 1537 int 1538 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1539 uint64_t val) 1540 { 1541 struct vfsopt *opt; 1542 1543 TAILQ_FOREACH(opt, opts, link) { 1544 if (strcmp(name, opt->name) == 0) { 1545 opt->seen = 1; 1546 if (w != NULL) 1547 *w |= val; 1548 return (1); 1549 } 1550 } 1551 if (w != NULL) 1552 *w &= ~val; 1553 return (0); 1554 } 1555 1556 int 1557 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1558 { 1559 va_list ap; 1560 struct vfsopt *opt; 1561 int ret; 1562 1563 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1564 1565 TAILQ_FOREACH(opt, opts, link) { 1566 if (strcmp(name, opt->name) != 0) 1567 continue; 1568 opt->seen = 1; 1569 if (opt->len == 0 || opt->value == NULL) 1570 return (0); 1571 if (((char *)opt->value)[opt->len - 1] != '\0') 1572 return (0); 1573 va_start(ap, fmt); 1574 ret = vsscanf(opt->value, fmt, ap); 1575 va_end(ap); 1576 return (ret); 1577 } 1578 return (0); 1579 } 1580 1581 int 1582 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1583 { 1584 struct vfsopt *opt; 1585 1586 TAILQ_FOREACH(opt, opts, link) { 1587 if (strcmp(name, opt->name) != 0) 1588 continue; 1589 opt->seen = 1; 1590 if (opt->value == NULL) 1591 opt->len = len; 1592 else { 1593 if (opt->len != len) 1594 return (EINVAL); 1595 bcopy(value, opt->value, len); 1596 } 1597 return (0); 1598 } 1599 return (ENOENT); 1600 } 1601 1602 int 1603 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1604 { 1605 struct vfsopt *opt; 1606 1607 TAILQ_FOREACH(opt, opts, link) { 1608 if (strcmp(name, opt->name) != 0) 1609 continue; 1610 opt->seen = 1; 1611 if (opt->value == NULL) 1612 opt->len = len; 1613 else { 1614 if (opt->len < len) 1615 return (EINVAL); 1616 opt->len = len; 1617 bcopy(value, opt->value, len); 1618 } 1619 return (0); 1620 } 1621 return (ENOENT); 1622 } 1623 1624 int 1625 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1626 { 1627 struct vfsopt *opt; 1628 1629 TAILQ_FOREACH(opt, opts, link) { 1630 if (strcmp(name, opt->name) != 0) 1631 continue; 1632 opt->seen = 1; 1633 if (opt->value == NULL) 1634 opt->len = strlen(value) + 1; 1635 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1636 return (EINVAL); 1637 return (0); 1638 } 1639 return (ENOENT); 1640 } 1641 1642 /* 1643 * Find and copy a mount option. 1644 * 1645 * The size of the buffer has to be specified 1646 * in len, if it is not the same length as the 1647 * mount option, EINVAL is returned. 1648 * Returns ENOENT if the option is not found. 1649 */ 1650 int 1651 vfs_copyopt(opts, name, dest, len) 1652 struct vfsoptlist *opts; 1653 const char *name; 1654 void *dest; 1655 int len; 1656 { 1657 struct vfsopt *opt; 1658 1659 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1660 1661 TAILQ_FOREACH(opt, opts, link) { 1662 if (strcmp(name, opt->name) == 0) { 1663 opt->seen = 1; 1664 if (len != opt->len) 1665 return (EINVAL); 1666 bcopy(opt->value, dest, opt->len); 1667 return (0); 1668 } 1669 } 1670 return (ENOENT); 1671 } 1672 1673 /* 1674 * These are helper functions for filesystems to traverse all 1675 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h. 1676 * 1677 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL. 1678 */ 1679 1680 MALLOC_DECLARE(M_VNODE_MARKER); 1681 1682 struct vnode * 1683 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1684 { 1685 struct vnode *vp; 1686 1687 mtx_assert(MNT_MTX(mp), MA_OWNED); 1688 1689 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1690 if (should_yield()) { 1691 MNT_IUNLOCK(mp); 1692 kern_yield(PRI_UNCHANGED); 1693 MNT_ILOCK(mp); 1694 } 1695 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1696 while (vp != NULL && vp->v_type == VMARKER) 1697 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1698 1699 /* Check if we are done */ 1700 if (vp == NULL) { 1701 __mnt_vnode_markerfree(mvp, mp); 1702 return (NULL); 1703 } 1704 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1705 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1706 return (vp); 1707 } 1708 1709 struct vnode * 1710 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1711 { 1712 struct vnode *vp; 1713 1714 mtx_assert(MNT_MTX(mp), MA_OWNED); 1715 1716 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1717 while (vp != NULL && vp->v_type == VMARKER) 1718 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1719 1720 /* Check if we are done */ 1721 if (vp == NULL) { 1722 *mvp = NULL; 1723 return (NULL); 1724 } 1725 MNT_REF(mp); 1726 MNT_IUNLOCK(mp); 1727 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1728 M_VNODE_MARKER, 1729 M_WAITOK | M_ZERO); 1730 MNT_ILOCK(mp); 1731 (*mvp)->v_type = VMARKER; 1732 1733 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1734 while (vp != NULL && vp->v_type == VMARKER) 1735 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1736 1737 /* Check if we are done */ 1738 if (vp == NULL) { 1739 MNT_IUNLOCK(mp); 1740 free(*mvp, M_VNODE_MARKER); 1741 MNT_ILOCK(mp); 1742 *mvp = NULL; 1743 MNT_REL(mp); 1744 return (NULL); 1745 } 1746 (*mvp)->v_mount = mp; 1747 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1748 return (vp); 1749 } 1750 1751 1752 void 1753 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1754 { 1755 1756 if (*mvp == NULL) 1757 return; 1758 1759 mtx_assert(MNT_MTX(mp), MA_OWNED); 1760 1761 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1762 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1763 MNT_IUNLOCK(mp); 1764 free(*mvp, M_VNODE_MARKER); 1765 MNT_ILOCK(mp); 1766 *mvp = NULL; 1767 MNT_REL(mp); 1768 } 1769 1770 int 1771 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1772 { 1773 int error; 1774 1775 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1776 if (sbp != &mp->mnt_stat) 1777 *sbp = mp->mnt_stat; 1778 return (error); 1779 } 1780 1781 void 1782 vfs_mountedfrom(struct mount *mp, const char *from) 1783 { 1784 1785 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1786 strlcpy(mp->mnt_stat.f_mntfromname, from, 1787 sizeof mp->mnt_stat.f_mntfromname); 1788 } 1789 1790 /* 1791 * --------------------------------------------------------------------- 1792 * This is the api for building mount args and mounting filesystems from 1793 * inside the kernel. 1794 * 1795 * The API works by accumulation of individual args. First error is 1796 * latched. 1797 * 1798 * XXX: should be documented in new manpage kernel_mount(9) 1799 */ 1800 1801 /* A memory allocation which must be freed when we are done */ 1802 struct mntaarg { 1803 SLIST_ENTRY(mntaarg) next; 1804 }; 1805 1806 /* The header for the mount arguments */ 1807 struct mntarg { 1808 struct iovec *v; 1809 int len; 1810 int error; 1811 SLIST_HEAD(, mntaarg) list; 1812 }; 1813 1814 /* 1815 * Add a boolean argument. 1816 * 1817 * flag is the boolean value. 1818 * name must start with "no". 1819 */ 1820 struct mntarg * 1821 mount_argb(struct mntarg *ma, int flag, const char *name) 1822 { 1823 1824 KASSERT(name[0] == 'n' && name[1] == 'o', 1825 ("mount_argb(...,%s): name must start with 'no'", name)); 1826 1827 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1828 } 1829 1830 /* 1831 * Add an argument printf style 1832 */ 1833 struct mntarg * 1834 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1835 { 1836 va_list ap; 1837 struct mntaarg *maa; 1838 struct sbuf *sb; 1839 int len; 1840 1841 if (ma == NULL) { 1842 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1843 SLIST_INIT(&ma->list); 1844 } 1845 if (ma->error) 1846 return (ma); 1847 1848 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1849 M_MOUNT, M_WAITOK); 1850 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1851 ma->v[ma->len].iov_len = strlen(name) + 1; 1852 ma->len++; 1853 1854 sb = sbuf_new_auto(); 1855 va_start(ap, fmt); 1856 sbuf_vprintf(sb, fmt, ap); 1857 va_end(ap); 1858 sbuf_finish(sb); 1859 len = sbuf_len(sb) + 1; 1860 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1861 SLIST_INSERT_HEAD(&ma->list, maa, next); 1862 bcopy(sbuf_data(sb), maa + 1, len); 1863 sbuf_delete(sb); 1864 1865 ma->v[ma->len].iov_base = maa + 1; 1866 ma->v[ma->len].iov_len = len; 1867 ma->len++; 1868 1869 return (ma); 1870 } 1871 1872 /* 1873 * Add an argument which is a userland string. 1874 */ 1875 struct mntarg * 1876 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1877 { 1878 struct mntaarg *maa; 1879 char *tbuf; 1880 1881 if (val == NULL) 1882 return (ma); 1883 if (ma == NULL) { 1884 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1885 SLIST_INIT(&ma->list); 1886 } 1887 if (ma->error) 1888 return (ma); 1889 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1890 SLIST_INSERT_HEAD(&ma->list, maa, next); 1891 tbuf = (void *)(maa + 1); 1892 ma->error = copyinstr(val, tbuf, len, NULL); 1893 return (mount_arg(ma, name, tbuf, -1)); 1894 } 1895 1896 /* 1897 * Plain argument. 1898 * 1899 * If length is -1, treat value as a C string. 1900 */ 1901 struct mntarg * 1902 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1903 { 1904 1905 if (ma == NULL) { 1906 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1907 SLIST_INIT(&ma->list); 1908 } 1909 if (ma->error) 1910 return (ma); 1911 1912 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1913 M_MOUNT, M_WAITOK); 1914 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1915 ma->v[ma->len].iov_len = strlen(name) + 1; 1916 ma->len++; 1917 1918 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1919 if (len < 0) 1920 ma->v[ma->len].iov_len = strlen(val) + 1; 1921 else 1922 ma->v[ma->len].iov_len = len; 1923 ma->len++; 1924 return (ma); 1925 } 1926 1927 /* 1928 * Free a mntarg structure 1929 */ 1930 static void 1931 free_mntarg(struct mntarg *ma) 1932 { 1933 struct mntaarg *maa; 1934 1935 while (!SLIST_EMPTY(&ma->list)) { 1936 maa = SLIST_FIRST(&ma->list); 1937 SLIST_REMOVE_HEAD(&ma->list, next); 1938 free(maa, M_MOUNT); 1939 } 1940 free(ma->v, M_MOUNT); 1941 free(ma, M_MOUNT); 1942 } 1943 1944 /* 1945 * Mount a filesystem 1946 */ 1947 int 1948 kernel_mount(struct mntarg *ma, uint64_t flags) 1949 { 1950 struct uio auio; 1951 int error; 1952 1953 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1954 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1955 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1956 1957 auio.uio_iov = ma->v; 1958 auio.uio_iovcnt = ma->len; 1959 auio.uio_segflg = UIO_SYSSPACE; 1960 1961 error = ma->error; 1962 if (!error) 1963 error = vfs_donmount(curthread, flags, &auio); 1964 free_mntarg(ma); 1965 return (error); 1966 } 1967 1968 /* 1969 * A printflike function to mount a filesystem. 1970 */ 1971 int 1972 kernel_vmount(int flags, ...) 1973 { 1974 struct mntarg *ma = NULL; 1975 va_list ap; 1976 const char *cp; 1977 const void *vp; 1978 int error; 1979 1980 va_start(ap, flags); 1981 for (;;) { 1982 cp = va_arg(ap, const char *); 1983 if (cp == NULL) 1984 break; 1985 vp = va_arg(ap, const void *); 1986 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1987 } 1988 va_end(ap); 1989 1990 error = kernel_mount(ma, flags); 1991 return (error); 1992 } 1993 1994 void 1995 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1996 { 1997 1998 bcopy(oexp, exp, sizeof(*oexp)); 1999 exp->ex_numsecflavors = 0; 2000 }
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