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: releng/9.1/sys/kern/vfs_mount.c 235626 2012-05-18 19:48:38Z mckusick $"); 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 return (mp); 483 } 484 485 /* 486 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 487 */ 488 void 489 vfs_mount_destroy(struct mount *mp) 490 { 491 492 MNT_ILOCK(mp); 493 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 494 if (mp->mnt_kern_flag & MNTK_MWAIT) { 495 mp->mnt_kern_flag &= ~MNTK_MWAIT; 496 wakeup(mp); 497 } 498 while (mp->mnt_ref) 499 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 500 KASSERT(mp->mnt_ref == 0, 501 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 502 __FILE__, __LINE__)); 503 if (mp->mnt_writeopcount != 0) 504 panic("vfs_mount_destroy: nonzero writeopcount"); 505 if (mp->mnt_secondary_writes != 0) 506 panic("vfs_mount_destroy: nonzero secondary_writes"); 507 mp->mnt_vfc->vfc_refcount--; 508 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 509 struct vnode *vp; 510 511 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 512 vprint("", vp); 513 panic("unmount: dangling vnode"); 514 } 515 if (mp->mnt_nvnodelistsize != 0) 516 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 517 if (mp->mnt_activevnodelistsize != 0) 518 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 519 if (mp->mnt_lockref != 0) 520 panic("vfs_mount_destroy: nonzero lock refcount"); 521 MNT_IUNLOCK(mp); 522 #ifdef MAC 523 mac_mount_destroy(mp); 524 #endif 525 if (mp->mnt_opt != NULL) 526 vfs_freeopts(mp->mnt_opt); 527 crfree(mp->mnt_cred); 528 uma_zfree(mount_zone, mp); 529 } 530 531 int 532 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 533 { 534 struct vfsoptlist *optlist; 535 struct vfsopt *opt, *tmp_opt; 536 char *fstype, *fspath, *errmsg; 537 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 538 539 errmsg = fspath = NULL; 540 errmsg_len = fspathlen = 0; 541 errmsg_pos = -1; 542 543 error = vfs_buildopts(fsoptions, &optlist); 544 if (error) 545 return (error); 546 547 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 548 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 549 550 /* 551 * We need these two options before the others, 552 * and they are mandatory for any filesystem. 553 * Ensure they are NUL terminated as well. 554 */ 555 fstypelen = 0; 556 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 557 if (error || fstype[fstypelen - 1] != '\0') { 558 error = EINVAL; 559 if (errmsg != NULL) 560 strncpy(errmsg, "Invalid fstype", errmsg_len); 561 goto bail; 562 } 563 fspathlen = 0; 564 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 565 if (error || fspath[fspathlen - 1] != '\0') { 566 error = EINVAL; 567 if (errmsg != NULL) 568 strncpy(errmsg, "Invalid fspath", errmsg_len); 569 goto bail; 570 } 571 572 /* 573 * We need to see if we have the "update" option 574 * before we call vfs_domount(), since vfs_domount() has special 575 * logic based on MNT_UPDATE. This is very important 576 * when we want to update the root filesystem. 577 */ 578 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 579 if (strcmp(opt->name, "update") == 0) { 580 fsflags |= MNT_UPDATE; 581 vfs_freeopt(optlist, opt); 582 } 583 else if (strcmp(opt->name, "async") == 0) 584 fsflags |= MNT_ASYNC; 585 else if (strcmp(opt->name, "force") == 0) { 586 fsflags |= MNT_FORCE; 587 vfs_freeopt(optlist, opt); 588 } 589 else if (strcmp(opt->name, "reload") == 0) { 590 fsflags |= MNT_RELOAD; 591 vfs_freeopt(optlist, opt); 592 } 593 else if (strcmp(opt->name, "multilabel") == 0) 594 fsflags |= MNT_MULTILABEL; 595 else if (strcmp(opt->name, "noasync") == 0) 596 fsflags &= ~MNT_ASYNC; 597 else if (strcmp(opt->name, "noatime") == 0) 598 fsflags |= MNT_NOATIME; 599 else if (strcmp(opt->name, "atime") == 0) { 600 free(opt->name, M_MOUNT); 601 opt->name = strdup("nonoatime", M_MOUNT); 602 } 603 else if (strcmp(opt->name, "noclusterr") == 0) 604 fsflags |= MNT_NOCLUSTERR; 605 else if (strcmp(opt->name, "clusterr") == 0) { 606 free(opt->name, M_MOUNT); 607 opt->name = strdup("nonoclusterr", M_MOUNT); 608 } 609 else if (strcmp(opt->name, "noclusterw") == 0) 610 fsflags |= MNT_NOCLUSTERW; 611 else if (strcmp(opt->name, "clusterw") == 0) { 612 free(opt->name, M_MOUNT); 613 opt->name = strdup("nonoclusterw", M_MOUNT); 614 } 615 else if (strcmp(opt->name, "noexec") == 0) 616 fsflags |= MNT_NOEXEC; 617 else if (strcmp(opt->name, "exec") == 0) { 618 free(opt->name, M_MOUNT); 619 opt->name = strdup("nonoexec", M_MOUNT); 620 } 621 else if (strcmp(opt->name, "nosuid") == 0) 622 fsflags |= MNT_NOSUID; 623 else if (strcmp(opt->name, "suid") == 0) { 624 free(opt->name, M_MOUNT); 625 opt->name = strdup("nonosuid", M_MOUNT); 626 } 627 else if (strcmp(opt->name, "nosymfollow") == 0) 628 fsflags |= MNT_NOSYMFOLLOW; 629 else if (strcmp(opt->name, "symfollow") == 0) { 630 free(opt->name, M_MOUNT); 631 opt->name = strdup("nonosymfollow", M_MOUNT); 632 } 633 else if (strcmp(opt->name, "noro") == 0) 634 fsflags &= ~MNT_RDONLY; 635 else if (strcmp(opt->name, "rw") == 0) 636 fsflags &= ~MNT_RDONLY; 637 else if (strcmp(opt->name, "ro") == 0) 638 fsflags |= MNT_RDONLY; 639 else if (strcmp(opt->name, "rdonly") == 0) { 640 free(opt->name, M_MOUNT); 641 opt->name = strdup("ro", M_MOUNT); 642 fsflags |= MNT_RDONLY; 643 } 644 else if (strcmp(opt->name, "suiddir") == 0) 645 fsflags |= MNT_SUIDDIR; 646 else if (strcmp(opt->name, "sync") == 0) 647 fsflags |= MNT_SYNCHRONOUS; 648 else if (strcmp(opt->name, "union") == 0) 649 fsflags |= MNT_UNION; 650 } 651 652 /* 653 * Be ultra-paranoid about making sure the type and fspath 654 * variables will fit in our mp buffers, including the 655 * terminating NUL. 656 */ 657 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 658 error = ENAMETOOLONG; 659 goto bail; 660 } 661 662 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 663 bail: 664 /* copyout the errmsg */ 665 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 666 && errmsg_len > 0 && errmsg != NULL) { 667 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 668 bcopy(errmsg, 669 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 670 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 671 } else { 672 copyout(errmsg, 673 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 674 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 675 } 676 } 677 678 if (optlist != NULL) 679 vfs_freeopts(optlist); 680 return (error); 681 } 682 683 /* 684 * Old mount API. 685 */ 686 #ifndef _SYS_SYSPROTO_H_ 687 struct mount_args { 688 char *type; 689 char *path; 690 int flags; 691 caddr_t data; 692 }; 693 #endif 694 /* ARGSUSED */ 695 int 696 sys_mount(td, uap) 697 struct thread *td; 698 struct mount_args /* { 699 char *type; 700 char *path; 701 int flags; 702 caddr_t data; 703 } */ *uap; 704 { 705 char *fstype; 706 struct vfsconf *vfsp = NULL; 707 struct mntarg *ma = NULL; 708 uint64_t flags; 709 int error; 710 711 /* 712 * Mount flags are now 64-bits. On 32-bit archtectures only 713 * 32-bits are passed in, but from here on everything handles 714 * 64-bit flags correctly. 715 */ 716 flags = uap->flags; 717 718 AUDIT_ARG_FFLAGS(flags); 719 720 /* 721 * Filter out MNT_ROOTFS. We do not want clients of mount() in 722 * userspace to set this flag, but we must filter it out if we want 723 * MNT_UPDATE on the root file system to work. 724 * MNT_ROOTFS should only be set by the kernel when mounting its 725 * root file system. 726 */ 727 flags &= ~MNT_ROOTFS; 728 729 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 730 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 731 if (error) { 732 free(fstype, M_TEMP); 733 return (error); 734 } 735 736 AUDIT_ARG_TEXT(fstype); 737 mtx_lock(&Giant); 738 vfsp = vfs_byname_kld(fstype, td, &error); 739 free(fstype, M_TEMP); 740 if (vfsp == NULL) { 741 mtx_unlock(&Giant); 742 return (ENOENT); 743 } 744 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 745 mtx_unlock(&Giant); 746 return (EOPNOTSUPP); 747 } 748 749 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 750 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 751 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 752 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 753 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 754 755 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 756 mtx_unlock(&Giant); 757 return (error); 758 } 759 760 /* 761 * vfs_domount_first(): first file system mount (not update) 762 */ 763 static int 764 vfs_domount_first( 765 struct thread *td, /* Calling thread. */ 766 struct vfsconf *vfsp, /* File system type. */ 767 char *fspath, /* Mount path. */ 768 struct vnode *vp, /* Vnode to be covered. */ 769 uint64_t fsflags, /* Flags common to all filesystems. */ 770 struct vfsoptlist **optlist /* Options local to the filesystem. */ 771 ) 772 { 773 struct vattr va; 774 struct mount *mp; 775 struct vnode *newdp; 776 int error; 777 778 mtx_assert(&Giant, MA_OWNED); 779 ASSERT_VOP_ELOCKED(vp, __func__); 780 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 781 782 /* 783 * If the user is not root, ensure that they own the directory 784 * onto which we are attempting to mount. 785 */ 786 error = VOP_GETATTR(vp, &va, td->td_ucred); 787 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 788 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 789 if (error == 0) 790 error = vinvalbuf(vp, V_SAVE, 0, 0); 791 if (error == 0 && vp->v_type != VDIR) 792 error = ENOTDIR; 793 if (error == 0) { 794 VI_LOCK(vp); 795 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 796 vp->v_iflag |= VI_MOUNT; 797 else 798 error = EBUSY; 799 VI_UNLOCK(vp); 800 } 801 if (error != 0) { 802 vput(vp); 803 return (error); 804 } 805 VOP_UNLOCK(vp, 0); 806 807 /* Allocate and initialize the filesystem. */ 808 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 809 /* XXXMAC: pass to vfs_mount_alloc? */ 810 mp->mnt_optnew = *optlist; 811 /* Set the mount level flags. */ 812 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 813 814 /* 815 * Mount the filesystem. 816 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 817 * get. No freeing of cn_pnbuf. 818 */ 819 error = VFS_MOUNT(mp); 820 if (error != 0) { 821 vfs_unbusy(mp); 822 vfs_mount_destroy(mp); 823 VI_LOCK(vp); 824 vp->v_iflag &= ~VI_MOUNT; 825 VI_UNLOCK(vp); 826 vrele(vp); 827 return (error); 828 } 829 830 if (mp->mnt_opt != NULL) 831 vfs_freeopts(mp->mnt_opt); 832 mp->mnt_opt = mp->mnt_optnew; 833 *optlist = NULL; 834 (void)VFS_STATFS(mp, &mp->mnt_stat); 835 836 /* 837 * Prevent external consumers of mount options from reading mnt_optnew. 838 */ 839 mp->mnt_optnew = NULL; 840 841 MNT_ILOCK(mp); 842 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 843 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 844 mp->mnt_kern_flag |= MNTK_ASYNC; 845 else 846 mp->mnt_kern_flag &= ~MNTK_ASYNC; 847 MNT_IUNLOCK(mp); 848 849 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 850 cache_purge(vp); 851 VI_LOCK(vp); 852 vp->v_iflag &= ~VI_MOUNT; 853 VI_UNLOCK(vp); 854 vp->v_mountedhere = mp; 855 /* Place the new filesystem at the end of the mount list. */ 856 mtx_lock(&mountlist_mtx); 857 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 858 mtx_unlock(&mountlist_mtx); 859 vfs_event_signal(NULL, VQ_MOUNT, 0); 860 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 861 panic("mount: lost mount"); 862 VOP_UNLOCK(newdp, 0); 863 VOP_UNLOCK(vp, 0); 864 mountcheckdirs(vp, newdp); 865 vrele(newdp); 866 if ((mp->mnt_flag & MNT_RDONLY) == 0) 867 vfs_allocate_syncvnode(mp); 868 vfs_unbusy(mp); 869 return (0); 870 } 871 872 /* 873 * vfs_domount_update(): update of mounted file system 874 */ 875 static int 876 vfs_domount_update( 877 struct thread *td, /* Calling thread. */ 878 struct vnode *vp, /* Mount point vnode. */ 879 uint64_t fsflags, /* Flags common to all filesystems. */ 880 struct vfsoptlist **optlist /* Options local to the filesystem. */ 881 ) 882 { 883 struct oexport_args oexport; 884 struct export_args export; 885 struct mount *mp; 886 int error, export_error; 887 uint64_t flag; 888 889 mtx_assert(&Giant, MA_OWNED); 890 ASSERT_VOP_ELOCKED(vp, __func__); 891 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 892 893 if ((vp->v_vflag & VV_ROOT) == 0) { 894 vput(vp); 895 return (EINVAL); 896 } 897 mp = vp->v_mount; 898 /* 899 * We only allow the filesystem to be reloaded if it 900 * is currently mounted read-only. 901 */ 902 flag = mp->mnt_flag; 903 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 904 vput(vp); 905 return (EOPNOTSUPP); /* Needs translation */ 906 } 907 /* 908 * Only privileged root, or (if MNT_USER is set) the user that 909 * did the original mount is permitted to update it. 910 */ 911 error = vfs_suser(mp, td); 912 if (error != 0) { 913 vput(vp); 914 return (error); 915 } 916 if (vfs_busy(mp, MBF_NOWAIT)) { 917 vput(vp); 918 return (EBUSY); 919 } 920 VI_LOCK(vp); 921 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 922 VI_UNLOCK(vp); 923 vfs_unbusy(mp); 924 vput(vp); 925 return (EBUSY); 926 } 927 vp->v_iflag |= VI_MOUNT; 928 VI_UNLOCK(vp); 929 VOP_UNLOCK(vp, 0); 930 931 MNT_ILOCK(mp); 932 mp->mnt_flag &= ~MNT_UPDATEMASK; 933 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 934 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 935 if ((mp->mnt_flag & MNT_ASYNC) == 0) 936 mp->mnt_kern_flag &= ~MNTK_ASYNC; 937 MNT_IUNLOCK(mp); 938 mp->mnt_optnew = *optlist; 939 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 940 941 /* 942 * Mount the filesystem. 943 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 944 * get. No freeing of cn_pnbuf. 945 */ 946 error = VFS_MOUNT(mp); 947 948 export_error = 0; 949 if (error == 0) { 950 /* Process the export option. */ 951 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 952 sizeof(export)) == 0) { 953 export_error = vfs_export(mp, &export); 954 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 955 sizeof(oexport)) == 0) { 956 export.ex_flags = oexport.ex_flags; 957 export.ex_root = oexport.ex_root; 958 export.ex_anon = oexport.ex_anon; 959 export.ex_addr = oexport.ex_addr; 960 export.ex_addrlen = oexport.ex_addrlen; 961 export.ex_mask = oexport.ex_mask; 962 export.ex_masklen = oexport.ex_masklen; 963 export.ex_indexfile = oexport.ex_indexfile; 964 export.ex_numsecflavors = 0; 965 export_error = vfs_export(mp, &export); 966 } 967 } 968 969 MNT_ILOCK(mp); 970 if (error == 0) { 971 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 972 MNT_SNAPSHOT); 973 } else { 974 /* 975 * If we fail, restore old mount flags. MNT_QUOTA is special, 976 * because it is not part of MNT_UPDATEMASK, but it could have 977 * changed in the meantime if quotactl(2) was called. 978 * All in all we want current value of MNT_QUOTA, not the old 979 * one. 980 */ 981 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 982 } 983 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 984 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 985 mp->mnt_kern_flag |= MNTK_ASYNC; 986 else 987 mp->mnt_kern_flag &= ~MNTK_ASYNC; 988 MNT_IUNLOCK(mp); 989 990 if (error != 0) 991 goto end; 992 993 if (mp->mnt_opt != NULL) 994 vfs_freeopts(mp->mnt_opt); 995 mp->mnt_opt = mp->mnt_optnew; 996 *optlist = NULL; 997 (void)VFS_STATFS(mp, &mp->mnt_stat); 998 /* 999 * Prevent external consumers of mount options from reading 1000 * mnt_optnew. 1001 */ 1002 mp->mnt_optnew = NULL; 1003 1004 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1005 vfs_allocate_syncvnode(mp); 1006 else 1007 vfs_deallocate_syncvnode(mp); 1008 end: 1009 vfs_unbusy(mp); 1010 VI_LOCK(vp); 1011 vp->v_iflag &= ~VI_MOUNT; 1012 VI_UNLOCK(vp); 1013 vrele(vp); 1014 return (error != 0 ? error : export_error); 1015 } 1016 1017 /* 1018 * vfs_domount(): actually attempt a filesystem mount. 1019 */ 1020 static int 1021 vfs_domount( 1022 struct thread *td, /* Calling thread. */ 1023 const char *fstype, /* Filesystem type. */ 1024 char *fspath, /* Mount path. */ 1025 uint64_t fsflags, /* Flags common to all filesystems. */ 1026 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1027 ) 1028 { 1029 struct vfsconf *vfsp; 1030 struct nameidata nd; 1031 struct vnode *vp; 1032 char *pathbuf; 1033 int error; 1034 1035 /* 1036 * Be ultra-paranoid about making sure the type and fspath 1037 * variables will fit in our mp buffers, including the 1038 * terminating NUL. 1039 */ 1040 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1041 return (ENAMETOOLONG); 1042 1043 if (jailed(td->td_ucred) || usermount == 0) { 1044 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1045 return (error); 1046 } 1047 1048 /* 1049 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1050 */ 1051 if (fsflags & MNT_EXPORTED) { 1052 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1053 if (error) 1054 return (error); 1055 } 1056 if (fsflags & MNT_SUIDDIR) { 1057 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1058 if (error) 1059 return (error); 1060 } 1061 /* 1062 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1063 */ 1064 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1065 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1066 fsflags |= MNT_NOSUID | MNT_USER; 1067 } 1068 1069 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1070 vfsp = NULL; 1071 if ((fsflags & MNT_UPDATE) == 0) { 1072 /* Don't try to load KLDs if we're mounting the root. */ 1073 if (fsflags & MNT_ROOTFS) 1074 vfsp = vfs_byname(fstype); 1075 else 1076 vfsp = vfs_byname_kld(fstype, td, &error); 1077 if (vfsp == NULL) 1078 return (ENODEV); 1079 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1080 return (EPERM); 1081 } 1082 1083 /* 1084 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1085 */ 1086 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1087 UIO_SYSSPACE, fspath, td); 1088 error = namei(&nd); 1089 if (error != 0) 1090 return (error); 1091 if (!NDHASGIANT(&nd)) 1092 mtx_lock(&Giant); 1093 NDFREE(&nd, NDF_ONLY_PNBUF); 1094 vp = nd.ni_vp; 1095 if ((fsflags & MNT_UPDATE) == 0) { 1096 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1097 strcpy(pathbuf, fspath); 1098 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1099 /* debug.disablefullpath == 1 results in ENODEV */ 1100 if (error == 0 || error == ENODEV) { 1101 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1102 fsflags, optlist); 1103 } 1104 free(pathbuf, M_TEMP); 1105 } else 1106 error = vfs_domount_update(td, vp, fsflags, optlist); 1107 mtx_unlock(&Giant); 1108 1109 ASSERT_VI_UNLOCKED(vp, __func__); 1110 ASSERT_VOP_UNLOCKED(vp, __func__); 1111 1112 return (error); 1113 } 1114 1115 /* 1116 * Unmount a filesystem. 1117 * 1118 * Note: unmount takes a path to the vnode mounted on as argument, not 1119 * special file (as before). 1120 */ 1121 #ifndef _SYS_SYSPROTO_H_ 1122 struct unmount_args { 1123 char *path; 1124 int flags; 1125 }; 1126 #endif 1127 /* ARGSUSED */ 1128 int 1129 sys_unmount(td, uap) 1130 struct thread *td; 1131 register struct unmount_args /* { 1132 char *path; 1133 int flags; 1134 } */ *uap; 1135 { 1136 struct nameidata nd; 1137 struct mount *mp; 1138 char *pathbuf; 1139 int error, id0, id1, vfslocked; 1140 1141 AUDIT_ARG_VALUE(uap->flags); 1142 if (jailed(td->td_ucred) || usermount == 0) { 1143 error = priv_check(td, PRIV_VFS_UNMOUNT); 1144 if (error) 1145 return (error); 1146 } 1147 1148 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1149 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1150 if (error) { 1151 free(pathbuf, M_TEMP); 1152 return (error); 1153 } 1154 mtx_lock(&Giant); 1155 if (uap->flags & MNT_BYFSID) { 1156 AUDIT_ARG_TEXT(pathbuf); 1157 /* Decode the filesystem ID. */ 1158 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1159 mtx_unlock(&Giant); 1160 free(pathbuf, M_TEMP); 1161 return (EINVAL); 1162 } 1163 1164 mtx_lock(&mountlist_mtx); 1165 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1166 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1167 mp->mnt_stat.f_fsid.val[1] == id1) 1168 break; 1169 } 1170 mtx_unlock(&mountlist_mtx); 1171 } else { 1172 AUDIT_ARG_UPATH1(td, pathbuf); 1173 /* 1174 * Try to find global path for path argument. 1175 */ 1176 NDINIT(&nd, LOOKUP, 1177 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1178 UIO_SYSSPACE, pathbuf, td); 1179 if (namei(&nd) == 0) { 1180 vfslocked = NDHASGIANT(&nd); 1181 NDFREE(&nd, NDF_ONLY_PNBUF); 1182 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1183 MNAMELEN); 1184 if (error == 0 || error == ENODEV) 1185 vput(nd.ni_vp); 1186 VFS_UNLOCK_GIANT(vfslocked); 1187 } 1188 mtx_lock(&mountlist_mtx); 1189 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1190 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1191 break; 1192 } 1193 mtx_unlock(&mountlist_mtx); 1194 } 1195 free(pathbuf, M_TEMP); 1196 if (mp == NULL) { 1197 /* 1198 * Previously we returned ENOENT for a nonexistent path and 1199 * EINVAL for a non-mountpoint. We cannot tell these apart 1200 * now, so in the !MNT_BYFSID case return the more likely 1201 * EINVAL for compatibility. 1202 */ 1203 mtx_unlock(&Giant); 1204 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1205 } 1206 1207 /* 1208 * Don't allow unmounting the root filesystem. 1209 */ 1210 if (mp->mnt_flag & MNT_ROOTFS) { 1211 mtx_unlock(&Giant); 1212 return (EINVAL); 1213 } 1214 error = dounmount(mp, uap->flags, td); 1215 mtx_unlock(&Giant); 1216 return (error); 1217 } 1218 1219 /* 1220 * Do the actual filesystem unmount. 1221 */ 1222 int 1223 dounmount(mp, flags, td) 1224 struct mount *mp; 1225 int flags; 1226 struct thread *td; 1227 { 1228 struct vnode *coveredvp, *fsrootvp; 1229 int error; 1230 uint64_t async_flag; 1231 int mnt_gen_r; 1232 1233 mtx_assert(&Giant, MA_OWNED); 1234 1235 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1236 mnt_gen_r = mp->mnt_gen; 1237 VI_LOCK(coveredvp); 1238 vholdl(coveredvp); 1239 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1240 vdrop(coveredvp); 1241 /* 1242 * Check for mp being unmounted while waiting for the 1243 * covered vnode lock. 1244 */ 1245 if (coveredvp->v_mountedhere != mp || 1246 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1247 VOP_UNLOCK(coveredvp, 0); 1248 return (EBUSY); 1249 } 1250 } 1251 /* 1252 * Only privileged root, or (if MNT_USER is set) the user that did the 1253 * original mount is permitted to unmount this filesystem. 1254 */ 1255 error = vfs_suser(mp, td); 1256 if (error) { 1257 if (coveredvp) 1258 VOP_UNLOCK(coveredvp, 0); 1259 return (error); 1260 } 1261 1262 MNT_ILOCK(mp); 1263 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1264 MNT_IUNLOCK(mp); 1265 if (coveredvp) 1266 VOP_UNLOCK(coveredvp, 0); 1267 return (EBUSY); 1268 } 1269 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1270 /* Allow filesystems to detect that a forced unmount is in progress. */ 1271 if (flags & MNT_FORCE) 1272 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1273 error = 0; 1274 if (mp->mnt_lockref) { 1275 mp->mnt_kern_flag |= MNTK_DRAINING; 1276 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1277 "mount drain", 0); 1278 } 1279 MNT_IUNLOCK(mp); 1280 KASSERT(mp->mnt_lockref == 0, 1281 ("%s: invalid lock refcount in the drain path @ %s:%d", 1282 __func__, __FILE__, __LINE__)); 1283 KASSERT(error == 0, 1284 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1285 __func__, __FILE__, __LINE__)); 1286 vn_start_write(NULL, &mp, V_WAIT); 1287 1288 if (mp->mnt_flag & MNT_EXPUBLIC) 1289 vfs_setpublicfs(NULL, NULL, NULL); 1290 1291 vfs_msync(mp, MNT_WAIT); 1292 MNT_ILOCK(mp); 1293 async_flag = mp->mnt_flag & MNT_ASYNC; 1294 mp->mnt_flag &= ~MNT_ASYNC; 1295 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1296 MNT_IUNLOCK(mp); 1297 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1298 vfs_deallocate_syncvnode(mp); 1299 /* 1300 * For forced unmounts, move process cdir/rdir refs on the fs root 1301 * vnode to the covered vnode. For non-forced unmounts we want 1302 * such references to cause an EBUSY error. 1303 */ 1304 if ((flags & MNT_FORCE) && 1305 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1306 if (mp->mnt_vnodecovered != NULL) 1307 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1308 if (fsrootvp == rootvnode) { 1309 vrele(rootvnode); 1310 rootvnode = NULL; 1311 } 1312 vput(fsrootvp); 1313 } 1314 if (((mp->mnt_flag & MNT_RDONLY) || 1315 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1316 error = VFS_UNMOUNT(mp, flags); 1317 vn_finished_write(mp); 1318 /* 1319 * If we failed to flush the dirty blocks for this mount point, 1320 * undo all the cdir/rdir and rootvnode changes we made above. 1321 * Unless we failed to do so because the device is reporting that 1322 * it doesn't exist anymore. 1323 */ 1324 if (error && error != ENXIO) { 1325 if ((flags & MNT_FORCE) && 1326 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1327 if (mp->mnt_vnodecovered != NULL) 1328 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1329 if (rootvnode == NULL) { 1330 rootvnode = fsrootvp; 1331 vref(rootvnode); 1332 } 1333 vput(fsrootvp); 1334 } 1335 MNT_ILOCK(mp); 1336 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1337 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1338 MNT_IUNLOCK(mp); 1339 vfs_allocate_syncvnode(mp); 1340 MNT_ILOCK(mp); 1341 } 1342 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1343 mp->mnt_flag |= async_flag; 1344 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1345 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1346 mp->mnt_kern_flag |= MNTK_ASYNC; 1347 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1348 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1349 wakeup(mp); 1350 } 1351 MNT_IUNLOCK(mp); 1352 if (coveredvp) 1353 VOP_UNLOCK(coveredvp, 0); 1354 return (error); 1355 } 1356 mtx_lock(&mountlist_mtx); 1357 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1358 mtx_unlock(&mountlist_mtx); 1359 if (coveredvp != NULL) { 1360 coveredvp->v_mountedhere = NULL; 1361 vput(coveredvp); 1362 } 1363 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1364 vfs_mount_destroy(mp); 1365 return (0); 1366 } 1367 1368 /* 1369 * Report errors during filesystem mounting. 1370 */ 1371 void 1372 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1373 { 1374 struct vfsoptlist *moptlist = mp->mnt_optnew; 1375 va_list ap; 1376 int error, len; 1377 char *errmsg; 1378 1379 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1380 if (error || errmsg == NULL || len <= 0) 1381 return; 1382 1383 va_start(ap, fmt); 1384 vsnprintf(errmsg, (size_t)len, fmt, ap); 1385 va_end(ap); 1386 } 1387 1388 void 1389 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1390 { 1391 va_list ap; 1392 int error, len; 1393 char *errmsg; 1394 1395 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1396 if (error || errmsg == NULL || len <= 0) 1397 return; 1398 1399 va_start(ap, fmt); 1400 vsnprintf(errmsg, (size_t)len, fmt, ap); 1401 va_end(ap); 1402 } 1403 1404 /* 1405 * --------------------------------------------------------------------- 1406 * Functions for querying mount options/arguments from filesystems. 1407 */ 1408 1409 /* 1410 * Check that no unknown options are given 1411 */ 1412 int 1413 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1414 { 1415 struct vfsopt *opt; 1416 char errmsg[255]; 1417 const char **t, *p, *q; 1418 int ret = 0; 1419 1420 TAILQ_FOREACH(opt, opts, link) { 1421 p = opt->name; 1422 q = NULL; 1423 if (p[0] == 'n' && p[1] == 'o') 1424 q = p + 2; 1425 for(t = global_opts; *t != NULL; t++) { 1426 if (strcmp(*t, p) == 0) 1427 break; 1428 if (q != NULL) { 1429 if (strcmp(*t, q) == 0) 1430 break; 1431 } 1432 } 1433 if (*t != NULL) 1434 continue; 1435 for(t = legal; *t != NULL; t++) { 1436 if (strcmp(*t, p) == 0) 1437 break; 1438 if (q != NULL) { 1439 if (strcmp(*t, q) == 0) 1440 break; 1441 } 1442 } 1443 if (*t != NULL) 1444 continue; 1445 snprintf(errmsg, sizeof(errmsg), 1446 "mount option <%s> is unknown", p); 1447 ret = EINVAL; 1448 } 1449 if (ret != 0) { 1450 TAILQ_FOREACH(opt, opts, link) { 1451 if (strcmp(opt->name, "errmsg") == 0) { 1452 strncpy((char *)opt->value, errmsg, opt->len); 1453 break; 1454 } 1455 } 1456 if (opt == NULL) 1457 printf("%s\n", errmsg); 1458 } 1459 return (ret); 1460 } 1461 1462 /* 1463 * Get a mount option by its name. 1464 * 1465 * Return 0 if the option was found, ENOENT otherwise. 1466 * If len is non-NULL it will be filled with the length 1467 * of the option. If buf is non-NULL, it will be filled 1468 * with the address of the option. 1469 */ 1470 int 1471 vfs_getopt(opts, name, buf, len) 1472 struct vfsoptlist *opts; 1473 const char *name; 1474 void **buf; 1475 int *len; 1476 { 1477 struct vfsopt *opt; 1478 1479 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1480 1481 TAILQ_FOREACH(opt, opts, link) { 1482 if (strcmp(name, opt->name) == 0) { 1483 opt->seen = 1; 1484 if (len != NULL) 1485 *len = opt->len; 1486 if (buf != NULL) 1487 *buf = opt->value; 1488 return (0); 1489 } 1490 } 1491 return (ENOENT); 1492 } 1493 1494 int 1495 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1496 { 1497 struct vfsopt *opt; 1498 1499 if (opts == NULL) 1500 return (-1); 1501 1502 TAILQ_FOREACH(opt, opts, link) { 1503 if (strcmp(name, opt->name) == 0) { 1504 opt->seen = 1; 1505 return (opt->pos); 1506 } 1507 } 1508 return (-1); 1509 } 1510 1511 char * 1512 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1513 { 1514 struct vfsopt *opt; 1515 1516 *error = 0; 1517 TAILQ_FOREACH(opt, opts, link) { 1518 if (strcmp(name, opt->name) != 0) 1519 continue; 1520 opt->seen = 1; 1521 if (opt->len == 0 || 1522 ((char *)opt->value)[opt->len - 1] != '\0') { 1523 *error = EINVAL; 1524 return (NULL); 1525 } 1526 return (opt->value); 1527 } 1528 *error = ENOENT; 1529 return (NULL); 1530 } 1531 1532 int 1533 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1534 uint64_t val) 1535 { 1536 struct vfsopt *opt; 1537 1538 TAILQ_FOREACH(opt, opts, link) { 1539 if (strcmp(name, opt->name) == 0) { 1540 opt->seen = 1; 1541 if (w != NULL) 1542 *w |= val; 1543 return (1); 1544 } 1545 } 1546 if (w != NULL) 1547 *w &= ~val; 1548 return (0); 1549 } 1550 1551 int 1552 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1553 { 1554 va_list ap; 1555 struct vfsopt *opt; 1556 int ret; 1557 1558 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1559 1560 TAILQ_FOREACH(opt, opts, link) { 1561 if (strcmp(name, opt->name) != 0) 1562 continue; 1563 opt->seen = 1; 1564 if (opt->len == 0 || opt->value == NULL) 1565 return (0); 1566 if (((char *)opt->value)[opt->len - 1] != '\0') 1567 return (0); 1568 va_start(ap, fmt); 1569 ret = vsscanf(opt->value, fmt, ap); 1570 va_end(ap); 1571 return (ret); 1572 } 1573 return (0); 1574 } 1575 1576 int 1577 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1578 { 1579 struct vfsopt *opt; 1580 1581 TAILQ_FOREACH(opt, opts, link) { 1582 if (strcmp(name, opt->name) != 0) 1583 continue; 1584 opt->seen = 1; 1585 if (opt->value == NULL) 1586 opt->len = len; 1587 else { 1588 if (opt->len != len) 1589 return (EINVAL); 1590 bcopy(value, opt->value, len); 1591 } 1592 return (0); 1593 } 1594 return (ENOENT); 1595 } 1596 1597 int 1598 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1599 { 1600 struct vfsopt *opt; 1601 1602 TAILQ_FOREACH(opt, opts, link) { 1603 if (strcmp(name, opt->name) != 0) 1604 continue; 1605 opt->seen = 1; 1606 if (opt->value == NULL) 1607 opt->len = len; 1608 else { 1609 if (opt->len < len) 1610 return (EINVAL); 1611 opt->len = len; 1612 bcopy(value, opt->value, len); 1613 } 1614 return (0); 1615 } 1616 return (ENOENT); 1617 } 1618 1619 int 1620 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1621 { 1622 struct vfsopt *opt; 1623 1624 TAILQ_FOREACH(opt, opts, link) { 1625 if (strcmp(name, opt->name) != 0) 1626 continue; 1627 opt->seen = 1; 1628 if (opt->value == NULL) 1629 opt->len = strlen(value) + 1; 1630 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1631 return (EINVAL); 1632 return (0); 1633 } 1634 return (ENOENT); 1635 } 1636 1637 /* 1638 * Find and copy a mount option. 1639 * 1640 * The size of the buffer has to be specified 1641 * in len, if it is not the same length as the 1642 * mount option, EINVAL is returned. 1643 * Returns ENOENT if the option is not found. 1644 */ 1645 int 1646 vfs_copyopt(opts, name, dest, len) 1647 struct vfsoptlist *opts; 1648 const char *name; 1649 void *dest; 1650 int len; 1651 { 1652 struct vfsopt *opt; 1653 1654 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1655 1656 TAILQ_FOREACH(opt, opts, link) { 1657 if (strcmp(name, opt->name) == 0) { 1658 opt->seen = 1; 1659 if (len != opt->len) 1660 return (EINVAL); 1661 bcopy(opt->value, dest, opt->len); 1662 return (0); 1663 } 1664 } 1665 return (ENOENT); 1666 } 1667 1668 /* 1669 * These are helper functions for filesystems to traverse all 1670 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h. 1671 * 1672 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL. 1673 */ 1674 1675 MALLOC_DECLARE(M_VNODE_MARKER); 1676 1677 struct vnode * 1678 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1679 { 1680 struct vnode *vp; 1681 1682 mtx_assert(MNT_MTX(mp), MA_OWNED); 1683 1684 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1685 if (should_yield()) { 1686 MNT_IUNLOCK(mp); 1687 kern_yield(PRI_UNCHANGED); 1688 MNT_ILOCK(mp); 1689 } 1690 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1691 while (vp != NULL && vp->v_type == VMARKER) 1692 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1693 1694 /* Check if we are done */ 1695 if (vp == NULL) { 1696 __mnt_vnode_markerfree(mvp, mp); 1697 return (NULL); 1698 } 1699 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1700 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1701 return (vp); 1702 } 1703 1704 struct vnode * 1705 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1706 { 1707 struct vnode *vp; 1708 1709 mtx_assert(MNT_MTX(mp), MA_OWNED); 1710 1711 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1712 while (vp != NULL && vp->v_type == VMARKER) 1713 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1714 1715 /* Check if we are done */ 1716 if (vp == NULL) { 1717 *mvp = NULL; 1718 return (NULL); 1719 } 1720 MNT_REF(mp); 1721 MNT_IUNLOCK(mp); 1722 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1723 M_VNODE_MARKER, 1724 M_WAITOK | M_ZERO); 1725 MNT_ILOCK(mp); 1726 (*mvp)->v_type = VMARKER; 1727 1728 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1729 while (vp != NULL && vp->v_type == VMARKER) 1730 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1731 1732 /* Check if we are done */ 1733 if (vp == NULL) { 1734 MNT_IUNLOCK(mp); 1735 free(*mvp, M_VNODE_MARKER); 1736 MNT_ILOCK(mp); 1737 *mvp = NULL; 1738 MNT_REL(mp); 1739 return (NULL); 1740 } 1741 (*mvp)->v_mount = mp; 1742 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1743 return (vp); 1744 } 1745 1746 1747 void 1748 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1749 { 1750 1751 if (*mvp == NULL) 1752 return; 1753 1754 mtx_assert(MNT_MTX(mp), MA_OWNED); 1755 1756 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1757 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1758 MNT_IUNLOCK(mp); 1759 free(*mvp, M_VNODE_MARKER); 1760 MNT_ILOCK(mp); 1761 *mvp = NULL; 1762 MNT_REL(mp); 1763 } 1764 1765 int 1766 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1767 { 1768 int error; 1769 1770 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1771 if (sbp != &mp->mnt_stat) 1772 *sbp = mp->mnt_stat; 1773 return (error); 1774 } 1775 1776 void 1777 vfs_mountedfrom(struct mount *mp, const char *from) 1778 { 1779 1780 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1781 strlcpy(mp->mnt_stat.f_mntfromname, from, 1782 sizeof mp->mnt_stat.f_mntfromname); 1783 } 1784 1785 /* 1786 * --------------------------------------------------------------------- 1787 * This is the api for building mount args and mounting filesystems from 1788 * inside the kernel. 1789 * 1790 * The API works by accumulation of individual args. First error is 1791 * latched. 1792 * 1793 * XXX: should be documented in new manpage kernel_mount(9) 1794 */ 1795 1796 /* A memory allocation which must be freed when we are done */ 1797 struct mntaarg { 1798 SLIST_ENTRY(mntaarg) next; 1799 }; 1800 1801 /* The header for the mount arguments */ 1802 struct mntarg { 1803 struct iovec *v; 1804 int len; 1805 int error; 1806 SLIST_HEAD(, mntaarg) list; 1807 }; 1808 1809 /* 1810 * Add a boolean argument. 1811 * 1812 * flag is the boolean value. 1813 * name must start with "no". 1814 */ 1815 struct mntarg * 1816 mount_argb(struct mntarg *ma, int flag, const char *name) 1817 { 1818 1819 KASSERT(name[0] == 'n' && name[1] == 'o', 1820 ("mount_argb(...,%s): name must start with 'no'", name)); 1821 1822 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1823 } 1824 1825 /* 1826 * Add an argument printf style 1827 */ 1828 struct mntarg * 1829 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1830 { 1831 va_list ap; 1832 struct mntaarg *maa; 1833 struct sbuf *sb; 1834 int len; 1835 1836 if (ma == NULL) { 1837 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1838 SLIST_INIT(&ma->list); 1839 } 1840 if (ma->error) 1841 return (ma); 1842 1843 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1844 M_MOUNT, M_WAITOK); 1845 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1846 ma->v[ma->len].iov_len = strlen(name) + 1; 1847 ma->len++; 1848 1849 sb = sbuf_new_auto(); 1850 va_start(ap, fmt); 1851 sbuf_vprintf(sb, fmt, ap); 1852 va_end(ap); 1853 sbuf_finish(sb); 1854 len = sbuf_len(sb) + 1; 1855 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1856 SLIST_INSERT_HEAD(&ma->list, maa, next); 1857 bcopy(sbuf_data(sb), maa + 1, len); 1858 sbuf_delete(sb); 1859 1860 ma->v[ma->len].iov_base = maa + 1; 1861 ma->v[ma->len].iov_len = len; 1862 ma->len++; 1863 1864 return (ma); 1865 } 1866 1867 /* 1868 * Add an argument which is a userland string. 1869 */ 1870 struct mntarg * 1871 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1872 { 1873 struct mntaarg *maa; 1874 char *tbuf; 1875 1876 if (val == NULL) 1877 return (ma); 1878 if (ma == NULL) { 1879 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1880 SLIST_INIT(&ma->list); 1881 } 1882 if (ma->error) 1883 return (ma); 1884 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1885 SLIST_INSERT_HEAD(&ma->list, maa, next); 1886 tbuf = (void *)(maa + 1); 1887 ma->error = copyinstr(val, tbuf, len, NULL); 1888 return (mount_arg(ma, name, tbuf, -1)); 1889 } 1890 1891 /* 1892 * Plain argument. 1893 * 1894 * If length is -1, treat value as a C string. 1895 */ 1896 struct mntarg * 1897 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1898 { 1899 1900 if (ma == NULL) { 1901 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1902 SLIST_INIT(&ma->list); 1903 } 1904 if (ma->error) 1905 return (ma); 1906 1907 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1908 M_MOUNT, M_WAITOK); 1909 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1910 ma->v[ma->len].iov_len = strlen(name) + 1; 1911 ma->len++; 1912 1913 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1914 if (len < 0) 1915 ma->v[ma->len].iov_len = strlen(val) + 1; 1916 else 1917 ma->v[ma->len].iov_len = len; 1918 ma->len++; 1919 return (ma); 1920 } 1921 1922 /* 1923 * Free a mntarg structure 1924 */ 1925 static void 1926 free_mntarg(struct mntarg *ma) 1927 { 1928 struct mntaarg *maa; 1929 1930 while (!SLIST_EMPTY(&ma->list)) { 1931 maa = SLIST_FIRST(&ma->list); 1932 SLIST_REMOVE_HEAD(&ma->list, next); 1933 free(maa, M_MOUNT); 1934 } 1935 free(ma->v, M_MOUNT); 1936 free(ma, M_MOUNT); 1937 } 1938 1939 /* 1940 * Mount a filesystem 1941 */ 1942 int 1943 kernel_mount(struct mntarg *ma, uint64_t flags) 1944 { 1945 struct uio auio; 1946 int error; 1947 1948 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 1949 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 1950 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 1951 1952 auio.uio_iov = ma->v; 1953 auio.uio_iovcnt = ma->len; 1954 auio.uio_segflg = UIO_SYSSPACE; 1955 1956 error = ma->error; 1957 if (!error) 1958 error = vfs_donmount(curthread, flags, &auio); 1959 free_mntarg(ma); 1960 return (error); 1961 } 1962 1963 /* 1964 * A printflike function to mount a filesystem. 1965 */ 1966 int 1967 kernel_vmount(int flags, ...) 1968 { 1969 struct mntarg *ma = NULL; 1970 va_list ap; 1971 const char *cp; 1972 const void *vp; 1973 int error; 1974 1975 va_start(ap, flags); 1976 for (;;) { 1977 cp = va_arg(ap, const char *); 1978 if (cp == NULL) 1979 break; 1980 vp = va_arg(ap, const void *); 1981 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 1982 } 1983 va_end(ap); 1984 1985 error = kernel_mount(ma, flags); 1986 return (error); 1987 } 1988 1989 void 1990 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 1991 { 1992 1993 bcopy(oexp, exp, sizeof(*oexp)); 1994 exp->ex_numsecflavors = 0; 1995 }
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