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 "opt_vfs_allow_nonmpsafe.h" 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/fcntl.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/libkern.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mutex.h> 51 #include <sys/namei.h> 52 #include <sys/priv.h> 53 #include <sys/proc.h> 54 #include <sys/filedesc.h> 55 #include <sys/reboot.h> 56 #include <sys/sbuf.h> 57 #include <sys/syscallsubr.h> 58 #include <sys/sysproto.h> 59 #include <sys/sx.h> 60 #include <sys/sysctl.h> 61 #include <sys/sysent.h> 62 #include <sys/systm.h> 63 #include <sys/vnode.h> 64 #include <vm/uma.h> 65 66 #include <geom/geom.h> 67 68 #include <machine/stdarg.h> 69 70 #include <security/audit/audit.h> 71 #include <security/mac/mac_framework.h> 72 73 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 74 75 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 76 uint64_t fsflags, struct vfsoptlist **optlist); 77 static void free_mntarg(struct mntarg *ma); 78 79 static int usermount = 0; 80 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 81 "Unprivileged users may mount and unmount file systems"); 82 83 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 84 static uma_zone_t mount_zone; 85 86 /* List of mounted filesystems. */ 87 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 88 89 /* For any iteration/modification of mountlist */ 90 struct mtx mountlist_mtx; 91 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 92 93 /* 94 * Global opts, taken by all filesystems 95 */ 96 static const char *global_opts[] = { 97 "errmsg", 98 "fstype", 99 "fspath", 100 "ro", 101 "rw", 102 "nosuid", 103 "noexec", 104 NULL 105 }; 106 107 static int 108 mount_init(void *mem, int size, int flags) 109 { 110 struct mount *mp; 111 112 mp = (struct mount *)mem; 113 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 114 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 115 return (0); 116 } 117 118 static void 119 mount_fini(void *mem, int size) 120 { 121 struct mount *mp; 122 123 mp = (struct mount *)mem; 124 lockdestroy(&mp->mnt_explock); 125 mtx_destroy(&mp->mnt_mtx); 126 } 127 128 static void 129 vfs_mount_init(void *dummy __unused) 130 { 131 132 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 133 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 134 } 135 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 136 137 /* 138 * --------------------------------------------------------------------- 139 * Functions for building and sanitizing the mount options 140 */ 141 142 /* Remove one mount option. */ 143 static void 144 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 145 { 146 147 TAILQ_REMOVE(opts, opt, link); 148 free(opt->name, M_MOUNT); 149 if (opt->value != NULL) 150 free(opt->value, M_MOUNT); 151 free(opt, M_MOUNT); 152 } 153 154 /* Release all resources related to the mount options. */ 155 void 156 vfs_freeopts(struct vfsoptlist *opts) 157 { 158 struct vfsopt *opt; 159 160 while (!TAILQ_EMPTY(opts)) { 161 opt = TAILQ_FIRST(opts); 162 vfs_freeopt(opts, opt); 163 } 164 free(opts, M_MOUNT); 165 } 166 167 void 168 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 169 { 170 struct vfsopt *opt, *temp; 171 172 if (opts == NULL) 173 return; 174 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 175 if (strcmp(opt->name, name) == 0) 176 vfs_freeopt(opts, opt); 177 } 178 } 179 180 static int 181 vfs_isopt_ro(const char *opt) 182 { 183 184 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 185 strcmp(opt, "norw") == 0) 186 return (1); 187 return (0); 188 } 189 190 static int 191 vfs_isopt_rw(const char *opt) 192 { 193 194 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 195 return (1); 196 return (0); 197 } 198 199 /* 200 * Check if options are equal (with or without the "no" prefix). 201 */ 202 static int 203 vfs_equalopts(const char *opt1, const char *opt2) 204 { 205 char *p; 206 207 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 208 if (strcmp(opt1, opt2) == 0) 209 return (1); 210 /* "noopt" vs. "opt" */ 211 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 212 return (1); 213 /* "opt" vs. "noopt" */ 214 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 215 return (1); 216 while ((p = strchr(opt1, '.')) != NULL && 217 !strncmp(opt1, opt2, ++p - opt1)) { 218 opt2 += p - opt1; 219 opt1 = p; 220 /* "foo.noopt" vs. "foo.opt" */ 221 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 222 return (1); 223 /* "foo.opt" vs. "foo.noopt" */ 224 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 225 return (1); 226 } 227 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 228 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 229 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 230 return (1); 231 return (0); 232 } 233 234 /* 235 * If a mount option is specified several times, 236 * (with or without the "no" prefix) only keep 237 * the last occurence of it. 238 */ 239 static void 240 vfs_sanitizeopts(struct vfsoptlist *opts) 241 { 242 struct vfsopt *opt, *opt2, *tmp; 243 244 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 245 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 246 while (opt2 != NULL) { 247 if (vfs_equalopts(opt->name, opt2->name)) { 248 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 249 vfs_freeopt(opts, opt2); 250 opt2 = tmp; 251 } else { 252 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 253 } 254 } 255 } 256 } 257 258 /* 259 * Build a linked list of mount options from a struct uio. 260 */ 261 int 262 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 263 { 264 struct vfsoptlist *opts; 265 struct vfsopt *opt; 266 size_t memused, namelen, optlen; 267 unsigned int i, iovcnt; 268 int error; 269 270 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 271 TAILQ_INIT(opts); 272 memused = 0; 273 iovcnt = auio->uio_iovcnt; 274 for (i = 0; i < iovcnt; i += 2) { 275 namelen = auio->uio_iov[i].iov_len; 276 optlen = auio->uio_iov[i + 1].iov_len; 277 memused += sizeof(struct vfsopt) + optlen + namelen; 278 /* 279 * Avoid consuming too much memory, and attempts to overflow 280 * memused. 281 */ 282 if (memused > VFS_MOUNTARG_SIZE_MAX || 283 optlen > VFS_MOUNTARG_SIZE_MAX || 284 namelen > VFS_MOUNTARG_SIZE_MAX) { 285 error = EINVAL; 286 goto bad; 287 } 288 289 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 290 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 291 opt->value = NULL; 292 opt->len = 0; 293 opt->pos = i / 2; 294 opt->seen = 0; 295 296 /* 297 * Do this early, so jumps to "bad" will free the current 298 * option. 299 */ 300 TAILQ_INSERT_TAIL(opts, opt, link); 301 302 if (auio->uio_segflg == UIO_SYSSPACE) { 303 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 304 } else { 305 error = copyin(auio->uio_iov[i].iov_base, opt->name, 306 namelen); 307 if (error) 308 goto bad; 309 } 310 /* Ensure names are null-terminated strings. */ 311 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 312 error = EINVAL; 313 goto bad; 314 } 315 if (optlen != 0) { 316 opt->len = optlen; 317 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 318 if (auio->uio_segflg == UIO_SYSSPACE) { 319 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 320 optlen); 321 } else { 322 error = copyin(auio->uio_iov[i + 1].iov_base, 323 opt->value, optlen); 324 if (error) 325 goto bad; 326 } 327 } 328 } 329 vfs_sanitizeopts(opts); 330 *options = opts; 331 return (0); 332 bad: 333 vfs_freeopts(opts); 334 return (error); 335 } 336 337 /* 338 * Merge the old mount options with the new ones passed 339 * in the MNT_UPDATE case. 340 * 341 * XXX: This function will keep a "nofoo" option in the new 342 * options. E.g, if the option's canonical name is "foo", 343 * "nofoo" ends up in the mount point's active options. 344 */ 345 static void 346 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 347 { 348 struct vfsopt *opt, *new; 349 350 TAILQ_FOREACH(opt, oldopts, link) { 351 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 352 new->name = strdup(opt->name, M_MOUNT); 353 if (opt->len != 0) { 354 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 355 bcopy(opt->value, new->value, opt->len); 356 } else 357 new->value = NULL; 358 new->len = opt->len; 359 new->seen = opt->seen; 360 TAILQ_INSERT_HEAD(toopts, new, link); 361 } 362 vfs_sanitizeopts(toopts); 363 } 364 365 /* 366 * Mount a filesystem. 367 */ 368 int 369 sys_nmount(td, uap) 370 struct thread *td; 371 struct nmount_args /* { 372 struct iovec *iovp; 373 unsigned int iovcnt; 374 int flags; 375 } */ *uap; 376 { 377 struct uio *auio; 378 int error; 379 u_int iovcnt; 380 uint64_t flags; 381 382 /* 383 * Mount flags are now 64-bits. On 32-bit archtectures only 384 * 32-bits are passed in, but from here on everything handles 385 * 64-bit flags correctly. 386 */ 387 flags = uap->flags; 388 389 AUDIT_ARG_FFLAGS(flags); 390 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 391 uap->iovp, uap->iovcnt, flags); 392 393 /* 394 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 395 * userspace to set this flag, but we must filter it out if we want 396 * MNT_UPDATE on the root file system to work. 397 * MNT_ROOTFS should only be set by the kernel when mounting its 398 * root file system. 399 */ 400 flags &= ~MNT_ROOTFS; 401 402 iovcnt = uap->iovcnt; 403 /* 404 * Check that we have an even number of iovec's 405 * and that we have at least two options. 406 */ 407 if ((iovcnt & 1) || (iovcnt < 4)) { 408 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 409 uap->iovcnt); 410 return (EINVAL); 411 } 412 413 error = copyinuio(uap->iovp, iovcnt, &auio); 414 if (error) { 415 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 416 __func__, error); 417 return (error); 418 } 419 error = vfs_donmount(td, flags, auio); 420 421 free(auio, M_IOV); 422 return (error); 423 } 424 425 /* 426 * --------------------------------------------------------------------- 427 * Various utility functions 428 */ 429 430 void 431 vfs_ref(struct mount *mp) 432 { 433 434 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 435 MNT_ILOCK(mp); 436 MNT_REF(mp); 437 MNT_IUNLOCK(mp); 438 } 439 440 void 441 vfs_rel(struct mount *mp) 442 { 443 444 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 445 MNT_ILOCK(mp); 446 MNT_REL(mp); 447 MNT_IUNLOCK(mp); 448 } 449 450 /* 451 * Allocate and initialize the mount point struct. 452 */ 453 struct mount * 454 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 455 struct ucred *cred) 456 { 457 struct mount *mp; 458 459 mp = uma_zalloc(mount_zone, M_WAITOK); 460 bzero(&mp->mnt_startzero, 461 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 462 TAILQ_INIT(&mp->mnt_nvnodelist); 463 mp->mnt_nvnodelistsize = 0; 464 TAILQ_INIT(&mp->mnt_activevnodelist); 465 mp->mnt_activevnodelistsize = 0; 466 mp->mnt_ref = 0; 467 (void) vfs_busy(mp, MBF_NOWAIT); 468 mp->mnt_op = vfsp->vfc_vfsops; 469 mp->mnt_vfc = vfsp; 470 vfsp->vfc_refcount++; /* XXX Unlocked */ 471 mp->mnt_stat.f_type = vfsp->vfc_typenum; 472 mp->mnt_gen++; 473 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 474 mp->mnt_vnodecovered = vp; 475 mp->mnt_cred = crdup(cred); 476 mp->mnt_stat.f_owner = cred->cr_uid; 477 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 478 mp->mnt_iosize_max = DFLTPHYS; 479 #ifdef MAC 480 mac_mount_init(mp); 481 mac_mount_create(cred, mp); 482 #endif 483 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 484 TAILQ_INIT(&mp->mnt_uppers); 485 return (mp); 486 } 487 488 /* 489 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 490 */ 491 void 492 vfs_mount_destroy(struct mount *mp) 493 { 494 495 MNT_ILOCK(mp); 496 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 497 if (mp->mnt_kern_flag & MNTK_MWAIT) { 498 mp->mnt_kern_flag &= ~MNTK_MWAIT; 499 wakeup(mp); 500 } 501 while (mp->mnt_ref) 502 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 503 KASSERT(mp->mnt_ref == 0, 504 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 505 __FILE__, __LINE__)); 506 if (mp->mnt_writeopcount != 0) 507 panic("vfs_mount_destroy: nonzero writeopcount"); 508 if (mp->mnt_secondary_writes != 0) 509 panic("vfs_mount_destroy: nonzero secondary_writes"); 510 mp->mnt_vfc->vfc_refcount--; 511 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 512 struct vnode *vp; 513 514 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 515 vprint("", vp); 516 panic("unmount: dangling vnode"); 517 } 518 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 519 if (mp->mnt_nvnodelistsize != 0) 520 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 521 if (mp->mnt_activevnodelistsize != 0) 522 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 523 if (mp->mnt_lockref != 0) 524 panic("vfs_mount_destroy: nonzero lock refcount"); 525 MNT_IUNLOCK(mp); 526 #ifdef MAC 527 mac_mount_destroy(mp); 528 #endif 529 if (mp->mnt_opt != NULL) 530 vfs_freeopts(mp->mnt_opt); 531 crfree(mp->mnt_cred); 532 uma_zfree(mount_zone, mp); 533 } 534 535 int 536 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 537 { 538 struct vfsoptlist *optlist; 539 struct vfsopt *opt, *tmp_opt; 540 char *fstype, *fspath, *errmsg; 541 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 542 543 errmsg = fspath = NULL; 544 errmsg_len = fspathlen = 0; 545 errmsg_pos = -1; 546 547 error = vfs_buildopts(fsoptions, &optlist); 548 if (error) 549 return (error); 550 551 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 552 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 553 554 /* 555 * We need these two options before the others, 556 * and they are mandatory for any filesystem. 557 * Ensure they are NUL terminated as well. 558 */ 559 fstypelen = 0; 560 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 561 if (error || fstype[fstypelen - 1] != '\0') { 562 error = EINVAL; 563 if (errmsg != NULL) 564 strncpy(errmsg, "Invalid fstype", errmsg_len); 565 goto bail; 566 } 567 fspathlen = 0; 568 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 569 if (error || fspath[fspathlen - 1] != '\0') { 570 error = EINVAL; 571 if (errmsg != NULL) 572 strncpy(errmsg, "Invalid fspath", errmsg_len); 573 goto bail; 574 } 575 576 /* 577 * We need to see if we have the "update" option 578 * before we call vfs_domount(), since vfs_domount() has special 579 * logic based on MNT_UPDATE. This is very important 580 * when we want to update the root filesystem. 581 */ 582 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 583 if (strcmp(opt->name, "update") == 0) { 584 fsflags |= MNT_UPDATE; 585 vfs_freeopt(optlist, opt); 586 } 587 else if (strcmp(opt->name, "async") == 0) 588 fsflags |= MNT_ASYNC; 589 else if (strcmp(opt->name, "force") == 0) { 590 fsflags |= MNT_FORCE; 591 vfs_freeopt(optlist, opt); 592 } 593 else if (strcmp(opt->name, "reload") == 0) { 594 fsflags |= MNT_RELOAD; 595 vfs_freeopt(optlist, opt); 596 } 597 else if (strcmp(opt->name, "multilabel") == 0) 598 fsflags |= MNT_MULTILABEL; 599 else if (strcmp(opt->name, "noasync") == 0) 600 fsflags &= ~MNT_ASYNC; 601 else if (strcmp(opt->name, "noatime") == 0) 602 fsflags |= MNT_NOATIME; 603 else if (strcmp(opt->name, "atime") == 0) { 604 free(opt->name, M_MOUNT); 605 opt->name = strdup("nonoatime", M_MOUNT); 606 } 607 else if (strcmp(opt->name, "noclusterr") == 0) 608 fsflags |= MNT_NOCLUSTERR; 609 else if (strcmp(opt->name, "clusterr") == 0) { 610 free(opt->name, M_MOUNT); 611 opt->name = strdup("nonoclusterr", M_MOUNT); 612 } 613 else if (strcmp(opt->name, "noclusterw") == 0) 614 fsflags |= MNT_NOCLUSTERW; 615 else if (strcmp(opt->name, "clusterw") == 0) { 616 free(opt->name, M_MOUNT); 617 opt->name = strdup("nonoclusterw", M_MOUNT); 618 } 619 else if (strcmp(opt->name, "noexec") == 0) 620 fsflags |= MNT_NOEXEC; 621 else if (strcmp(opt->name, "exec") == 0) { 622 free(opt->name, M_MOUNT); 623 opt->name = strdup("nonoexec", M_MOUNT); 624 } 625 else if (strcmp(opt->name, "nosuid") == 0) 626 fsflags |= MNT_NOSUID; 627 else if (strcmp(opt->name, "suid") == 0) { 628 free(opt->name, M_MOUNT); 629 opt->name = strdup("nonosuid", M_MOUNT); 630 } 631 else if (strcmp(opt->name, "nosymfollow") == 0) 632 fsflags |= MNT_NOSYMFOLLOW; 633 else if (strcmp(opt->name, "symfollow") == 0) { 634 free(opt->name, M_MOUNT); 635 opt->name = strdup("nonosymfollow", M_MOUNT); 636 } 637 else if (strcmp(opt->name, "noro") == 0) 638 fsflags &= ~MNT_RDONLY; 639 else if (strcmp(opt->name, "rw") == 0) 640 fsflags &= ~MNT_RDONLY; 641 else if (strcmp(opt->name, "ro") == 0) 642 fsflags |= MNT_RDONLY; 643 else if (strcmp(opt->name, "rdonly") == 0) { 644 free(opt->name, M_MOUNT); 645 opt->name = strdup("ro", M_MOUNT); 646 fsflags |= MNT_RDONLY; 647 } 648 else if (strcmp(opt->name, "suiddir") == 0) 649 fsflags |= MNT_SUIDDIR; 650 else if (strcmp(opt->name, "sync") == 0) 651 fsflags |= MNT_SYNCHRONOUS; 652 else if (strcmp(opt->name, "union") == 0) 653 fsflags |= MNT_UNION; 654 } 655 656 /* 657 * Be ultra-paranoid about making sure the type and fspath 658 * variables will fit in our mp buffers, including the 659 * terminating NUL. 660 */ 661 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 662 error = ENAMETOOLONG; 663 goto bail; 664 } 665 666 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 667 bail: 668 /* copyout the errmsg */ 669 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 670 && errmsg_len > 0 && errmsg != NULL) { 671 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 672 bcopy(errmsg, 673 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 674 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 675 } else { 676 copyout(errmsg, 677 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 678 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 679 } 680 } 681 682 if (optlist != NULL) 683 vfs_freeopts(optlist); 684 return (error); 685 } 686 687 /* 688 * Old mount API. 689 */ 690 #ifndef _SYS_SYSPROTO_H_ 691 struct mount_args { 692 char *type; 693 char *path; 694 int flags; 695 caddr_t data; 696 }; 697 #endif 698 /* ARGSUSED */ 699 int 700 sys_mount(td, uap) 701 struct thread *td; 702 struct mount_args /* { 703 char *type; 704 char *path; 705 int flags; 706 caddr_t data; 707 } */ *uap; 708 { 709 char *fstype; 710 struct vfsconf *vfsp = NULL; 711 struct mntarg *ma = NULL; 712 uint64_t flags; 713 int error; 714 715 /* 716 * Mount flags are now 64-bits. On 32-bit archtectures only 717 * 32-bits are passed in, but from here on everything handles 718 * 64-bit flags correctly. 719 */ 720 flags = uap->flags; 721 722 AUDIT_ARG_FFLAGS(flags); 723 724 /* 725 * Filter out MNT_ROOTFS. We do not want clients of mount() in 726 * userspace to set this flag, but we must filter it out if we want 727 * MNT_UPDATE on the root file system to work. 728 * MNT_ROOTFS should only be set by the kernel when mounting its 729 * root file system. 730 */ 731 flags &= ~MNT_ROOTFS; 732 733 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 734 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 735 if (error) { 736 free(fstype, M_TEMP); 737 return (error); 738 } 739 740 AUDIT_ARG_TEXT(fstype); 741 mtx_lock(&Giant); 742 vfsp = vfs_byname_kld(fstype, td, &error); 743 free(fstype, M_TEMP); 744 if (vfsp == NULL) { 745 mtx_unlock(&Giant); 746 return (ENOENT); 747 } 748 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 749 mtx_unlock(&Giant); 750 return (EOPNOTSUPP); 751 } 752 753 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 754 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 755 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 756 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 757 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 758 759 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 760 mtx_unlock(&Giant); 761 return (error); 762 } 763 764 /* 765 * vfs_domount_first(): first file system mount (not update) 766 */ 767 static int 768 vfs_domount_first( 769 struct thread *td, /* Calling thread. */ 770 struct vfsconf *vfsp, /* File system type. */ 771 char *fspath, /* Mount path. */ 772 struct vnode *vp, /* Vnode to be covered. */ 773 uint64_t fsflags, /* Flags common to all filesystems. */ 774 struct vfsoptlist **optlist /* Options local to the filesystem. */ 775 ) 776 { 777 struct vattr va; 778 struct mount *mp; 779 struct vnode *newdp; 780 int error; 781 782 mtx_assert(&Giant, MA_OWNED); 783 ASSERT_VOP_ELOCKED(vp, __func__); 784 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 785 786 /* 787 * If the user is not root, ensure that they own the directory 788 * onto which we are attempting to mount. 789 */ 790 error = VOP_GETATTR(vp, &va, td->td_ucred); 791 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 792 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 793 if (error == 0) 794 error = vinvalbuf(vp, V_SAVE, 0, 0); 795 if (error == 0 && vp->v_type != VDIR) 796 error = ENOTDIR; 797 if (error == 0) { 798 VI_LOCK(vp); 799 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 800 vp->v_iflag |= VI_MOUNT; 801 else 802 error = EBUSY; 803 VI_UNLOCK(vp); 804 } 805 if (error != 0) { 806 vput(vp); 807 return (error); 808 } 809 VOP_UNLOCK(vp, 0); 810 811 /* Allocate and initialize the filesystem. */ 812 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 813 /* XXXMAC: pass to vfs_mount_alloc? */ 814 mp->mnt_optnew = *optlist; 815 /* Set the mount level flags. */ 816 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 817 818 /* 819 * Mount the filesystem. 820 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 821 * get. No freeing of cn_pnbuf. 822 */ 823 error = VFS_MOUNT(mp); 824 #ifndef VFS_ALLOW_NONMPSAFE 825 if (error == 0 && VFS_NEEDSGIANT(mp)) { 826 (void)VFS_UNMOUNT(mp, fsflags); 827 error = ENXIO; 828 printf("%s: Mounting non-MPSAFE fs (%s) is disabled\n", 829 __func__, mp->mnt_vfc->vfc_name); 830 } 831 #endif 832 if (error != 0) { 833 vfs_unbusy(mp); 834 vfs_mount_destroy(mp); 835 VI_LOCK(vp); 836 vp->v_iflag &= ~VI_MOUNT; 837 VI_UNLOCK(vp); 838 vrele(vp); 839 return (error); 840 } 841 #ifdef VFS_ALLOW_NONMPSAFE 842 if (VFS_NEEDSGIANT(mp)) 843 printf("%s: Mounting non-MPSAFE fs (%s) is deprecated\n", 844 __func__, mp->mnt_vfc->vfc_name); 845 #endif 846 847 if (mp->mnt_opt != NULL) 848 vfs_freeopts(mp->mnt_opt); 849 mp->mnt_opt = mp->mnt_optnew; 850 *optlist = NULL; 851 (void)VFS_STATFS(mp, &mp->mnt_stat); 852 853 /* 854 * Prevent external consumers of mount options from reading mnt_optnew. 855 */ 856 mp->mnt_optnew = NULL; 857 858 MNT_ILOCK(mp); 859 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 860 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 861 mp->mnt_kern_flag |= MNTK_ASYNC; 862 else 863 mp->mnt_kern_flag &= ~MNTK_ASYNC; 864 MNT_IUNLOCK(mp); 865 866 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 867 cache_purge(vp); 868 VI_LOCK(vp); 869 vp->v_iflag &= ~VI_MOUNT; 870 VI_UNLOCK(vp); 871 vp->v_mountedhere = mp; 872 /* Place the new filesystem at the end of the mount list. */ 873 mtx_lock(&mountlist_mtx); 874 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 875 mtx_unlock(&mountlist_mtx); 876 vfs_event_signal(NULL, VQ_MOUNT, 0); 877 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 878 panic("mount: lost mount"); 879 VOP_UNLOCK(newdp, 0); 880 VOP_UNLOCK(vp, 0); 881 mountcheckdirs(vp, newdp); 882 vrele(newdp); 883 if ((mp->mnt_flag & MNT_RDONLY) == 0) 884 vfs_allocate_syncvnode(mp); 885 vfs_unbusy(mp); 886 return (0); 887 } 888 889 /* 890 * vfs_domount_update(): update of mounted file system 891 */ 892 static int 893 vfs_domount_update( 894 struct thread *td, /* Calling thread. */ 895 struct vnode *vp, /* Mount point vnode. */ 896 uint64_t fsflags, /* Flags common to all filesystems. */ 897 struct vfsoptlist **optlist /* Options local to the filesystem. */ 898 ) 899 { 900 struct oexport_args oexport; 901 struct export_args export; 902 struct mount *mp; 903 int error, export_error; 904 uint64_t flag; 905 906 mtx_assert(&Giant, MA_OWNED); 907 ASSERT_VOP_ELOCKED(vp, __func__); 908 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 909 910 if ((vp->v_vflag & VV_ROOT) == 0) { 911 vput(vp); 912 return (EINVAL); 913 } 914 mp = vp->v_mount; 915 /* 916 * We only allow the filesystem to be reloaded if it 917 * is currently mounted read-only. 918 */ 919 flag = mp->mnt_flag; 920 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 921 vput(vp); 922 return (EOPNOTSUPP); /* Needs translation */ 923 } 924 /* 925 * Only privileged root, or (if MNT_USER is set) the user that 926 * did the original mount is permitted to update it. 927 */ 928 error = vfs_suser(mp, td); 929 if (error != 0) { 930 vput(vp); 931 return (error); 932 } 933 if (vfs_busy(mp, MBF_NOWAIT)) { 934 vput(vp); 935 return (EBUSY); 936 } 937 VI_LOCK(vp); 938 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 939 VI_UNLOCK(vp); 940 vfs_unbusy(mp); 941 vput(vp); 942 return (EBUSY); 943 } 944 vp->v_iflag |= VI_MOUNT; 945 VI_UNLOCK(vp); 946 VOP_UNLOCK(vp, 0); 947 948 MNT_ILOCK(mp); 949 mp->mnt_flag &= ~MNT_UPDATEMASK; 950 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 951 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 952 if ((mp->mnt_flag & MNT_ASYNC) == 0) 953 mp->mnt_kern_flag &= ~MNTK_ASYNC; 954 MNT_IUNLOCK(mp); 955 mp->mnt_optnew = *optlist; 956 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 957 958 /* 959 * Mount the filesystem. 960 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 961 * get. No freeing of cn_pnbuf. 962 */ 963 error = VFS_MOUNT(mp); 964 965 export_error = 0; 966 if (error == 0) { 967 /* Process the export option. */ 968 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 969 sizeof(export)) == 0) { 970 export_error = vfs_export(mp, &export); 971 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 972 sizeof(oexport)) == 0) { 973 export.ex_flags = oexport.ex_flags; 974 export.ex_root = oexport.ex_root; 975 export.ex_anon = oexport.ex_anon; 976 export.ex_addr = oexport.ex_addr; 977 export.ex_addrlen = oexport.ex_addrlen; 978 export.ex_mask = oexport.ex_mask; 979 export.ex_masklen = oexport.ex_masklen; 980 export.ex_indexfile = oexport.ex_indexfile; 981 export.ex_numsecflavors = 0; 982 export_error = vfs_export(mp, &export); 983 } 984 } 985 986 MNT_ILOCK(mp); 987 if (error == 0) { 988 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 989 MNT_SNAPSHOT); 990 } else { 991 /* 992 * If we fail, restore old mount flags. MNT_QUOTA is special, 993 * because it is not part of MNT_UPDATEMASK, but it could have 994 * changed in the meantime if quotactl(2) was called. 995 * All in all we want current value of MNT_QUOTA, not the old 996 * one. 997 */ 998 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 999 } 1000 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1001 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1002 mp->mnt_kern_flag |= MNTK_ASYNC; 1003 else 1004 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1005 MNT_IUNLOCK(mp); 1006 1007 if (error != 0) 1008 goto end; 1009 1010 if (mp->mnt_opt != NULL) 1011 vfs_freeopts(mp->mnt_opt); 1012 mp->mnt_opt = mp->mnt_optnew; 1013 *optlist = NULL; 1014 (void)VFS_STATFS(mp, &mp->mnt_stat); 1015 /* 1016 * Prevent external consumers of mount options from reading 1017 * mnt_optnew. 1018 */ 1019 mp->mnt_optnew = NULL; 1020 1021 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1022 vfs_allocate_syncvnode(mp); 1023 else 1024 vfs_deallocate_syncvnode(mp); 1025 end: 1026 vfs_unbusy(mp); 1027 VI_LOCK(vp); 1028 vp->v_iflag &= ~VI_MOUNT; 1029 VI_UNLOCK(vp); 1030 vrele(vp); 1031 return (error != 0 ? error : export_error); 1032 } 1033 1034 /* 1035 * vfs_domount(): actually attempt a filesystem mount. 1036 */ 1037 static int 1038 vfs_domount( 1039 struct thread *td, /* Calling thread. */ 1040 const char *fstype, /* Filesystem type. */ 1041 char *fspath, /* Mount path. */ 1042 uint64_t fsflags, /* Flags common to all filesystems. */ 1043 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1044 ) 1045 { 1046 struct vfsconf *vfsp; 1047 struct nameidata nd; 1048 struct vnode *vp; 1049 char *pathbuf; 1050 int error; 1051 1052 /* 1053 * Be ultra-paranoid about making sure the type and fspath 1054 * variables will fit in our mp buffers, including the 1055 * terminating NUL. 1056 */ 1057 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1058 return (ENAMETOOLONG); 1059 1060 if (jailed(td->td_ucred) || usermount == 0) { 1061 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1062 return (error); 1063 } 1064 1065 /* 1066 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1067 */ 1068 if (fsflags & MNT_EXPORTED) { 1069 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1070 if (error) 1071 return (error); 1072 } 1073 if (fsflags & MNT_SUIDDIR) { 1074 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1075 if (error) 1076 return (error); 1077 } 1078 /* 1079 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1080 */ 1081 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1082 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1083 fsflags |= MNT_NOSUID | MNT_USER; 1084 } 1085 1086 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1087 vfsp = NULL; 1088 if ((fsflags & MNT_UPDATE) == 0) { 1089 /* Don't try to load KLDs if we're mounting the root. */ 1090 if (fsflags & MNT_ROOTFS) 1091 vfsp = vfs_byname(fstype); 1092 else 1093 vfsp = vfs_byname_kld(fstype, td, &error); 1094 if (vfsp == NULL) 1095 return (ENODEV); 1096 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1097 return (EPERM); 1098 } 1099 1100 /* 1101 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1102 */ 1103 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1104 UIO_SYSSPACE, fspath, td); 1105 error = namei(&nd); 1106 if (error != 0) 1107 return (error); 1108 if (!NDHASGIANT(&nd)) 1109 mtx_lock(&Giant); 1110 NDFREE(&nd, NDF_ONLY_PNBUF); 1111 vp = nd.ni_vp; 1112 if ((fsflags & MNT_UPDATE) == 0) { 1113 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1114 strcpy(pathbuf, fspath); 1115 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1116 /* debug.disablefullpath == 1 results in ENODEV */ 1117 if (error == 0 || error == ENODEV) { 1118 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1119 fsflags, optlist); 1120 } 1121 free(pathbuf, M_TEMP); 1122 } else 1123 error = vfs_domount_update(td, vp, fsflags, optlist); 1124 mtx_unlock(&Giant); 1125 1126 ASSERT_VI_UNLOCKED(vp, __func__); 1127 ASSERT_VOP_UNLOCKED(vp, __func__); 1128 1129 return (error); 1130 } 1131 1132 /* 1133 * Unmount a filesystem. 1134 * 1135 * Note: unmount takes a path to the vnode mounted on as argument, not 1136 * special file (as before). 1137 */ 1138 #ifndef _SYS_SYSPROTO_H_ 1139 struct unmount_args { 1140 char *path; 1141 int flags; 1142 }; 1143 #endif 1144 /* ARGSUSED */ 1145 int 1146 sys_unmount(td, uap) 1147 struct thread *td; 1148 register struct unmount_args /* { 1149 char *path; 1150 int flags; 1151 } */ *uap; 1152 { 1153 struct nameidata nd; 1154 struct mount *mp; 1155 char *pathbuf; 1156 int error, id0, id1, vfslocked; 1157 1158 AUDIT_ARG_VALUE(uap->flags); 1159 if (jailed(td->td_ucred) || usermount == 0) { 1160 error = priv_check(td, PRIV_VFS_UNMOUNT); 1161 if (error) 1162 return (error); 1163 } 1164 1165 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1166 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1167 if (error) { 1168 free(pathbuf, M_TEMP); 1169 return (error); 1170 } 1171 mtx_lock(&Giant); 1172 if (uap->flags & MNT_BYFSID) { 1173 AUDIT_ARG_TEXT(pathbuf); 1174 /* Decode the filesystem ID. */ 1175 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1176 mtx_unlock(&Giant); 1177 free(pathbuf, M_TEMP); 1178 return (EINVAL); 1179 } 1180 1181 mtx_lock(&mountlist_mtx); 1182 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1183 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1184 mp->mnt_stat.f_fsid.val[1] == id1) 1185 break; 1186 } 1187 mtx_unlock(&mountlist_mtx); 1188 } else { 1189 AUDIT_ARG_UPATH1(td, pathbuf); 1190 /* 1191 * Try to find global path for path argument. 1192 */ 1193 NDINIT(&nd, LOOKUP, 1194 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1195 UIO_SYSSPACE, pathbuf, td); 1196 if (namei(&nd) == 0) { 1197 vfslocked = NDHASGIANT(&nd); 1198 NDFREE(&nd, NDF_ONLY_PNBUF); 1199 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1200 MNAMELEN); 1201 if (error == 0 || error == ENODEV) 1202 vput(nd.ni_vp); 1203 VFS_UNLOCK_GIANT(vfslocked); 1204 } 1205 mtx_lock(&mountlist_mtx); 1206 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1207 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1208 break; 1209 } 1210 mtx_unlock(&mountlist_mtx); 1211 } 1212 free(pathbuf, M_TEMP); 1213 if (mp == NULL) { 1214 /* 1215 * Previously we returned ENOENT for a nonexistent path and 1216 * EINVAL for a non-mountpoint. We cannot tell these apart 1217 * now, so in the !MNT_BYFSID case return the more likely 1218 * EINVAL for compatibility. 1219 */ 1220 mtx_unlock(&Giant); 1221 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1222 } 1223 1224 /* 1225 * Don't allow unmounting the root filesystem. 1226 */ 1227 if (mp->mnt_flag & MNT_ROOTFS) { 1228 mtx_unlock(&Giant); 1229 return (EINVAL); 1230 } 1231 error = dounmount(mp, uap->flags, td); 1232 mtx_unlock(&Giant); 1233 return (error); 1234 } 1235 1236 /* 1237 * Do the actual filesystem unmount. 1238 */ 1239 int 1240 dounmount(mp, flags, td) 1241 struct mount *mp; 1242 int flags; 1243 struct thread *td; 1244 { 1245 struct vnode *coveredvp, *fsrootvp; 1246 int error; 1247 uint64_t async_flag; 1248 int mnt_gen_r; 1249 1250 mtx_assert(&Giant, MA_OWNED); 1251 1252 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1253 mnt_gen_r = mp->mnt_gen; 1254 VI_LOCK(coveredvp); 1255 vholdl(coveredvp); 1256 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1257 vdrop(coveredvp); 1258 /* 1259 * Check for mp being unmounted while waiting for the 1260 * covered vnode lock. 1261 */ 1262 if (coveredvp->v_mountedhere != mp || 1263 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1264 VOP_UNLOCK(coveredvp, 0); 1265 return (EBUSY); 1266 } 1267 } 1268 /* 1269 * Only privileged root, or (if MNT_USER is set) the user that did the 1270 * original mount is permitted to unmount this filesystem. 1271 */ 1272 error = vfs_suser(mp, td); 1273 if (error) { 1274 if (coveredvp) 1275 VOP_UNLOCK(coveredvp, 0); 1276 return (error); 1277 } 1278 1279 MNT_ILOCK(mp); 1280 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1281 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1282 MNT_IUNLOCK(mp); 1283 if (coveredvp) 1284 VOP_UNLOCK(coveredvp, 0); 1285 return (EBUSY); 1286 } 1287 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1288 /* Allow filesystems to detect that a forced unmount is in progress. */ 1289 if (flags & MNT_FORCE) 1290 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1291 error = 0; 1292 if (mp->mnt_lockref) { 1293 mp->mnt_kern_flag |= MNTK_DRAINING; 1294 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1295 "mount drain", 0); 1296 } 1297 MNT_IUNLOCK(mp); 1298 KASSERT(mp->mnt_lockref == 0, 1299 ("%s: invalid lock refcount in the drain path @ %s:%d", 1300 __func__, __FILE__, __LINE__)); 1301 KASSERT(error == 0, 1302 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1303 __func__, __FILE__, __LINE__)); 1304 vn_start_write(NULL, &mp, V_WAIT); 1305 1306 if (mp->mnt_flag & MNT_EXPUBLIC) 1307 vfs_setpublicfs(NULL, NULL, NULL); 1308 1309 vfs_msync(mp, MNT_WAIT); 1310 MNT_ILOCK(mp); 1311 async_flag = mp->mnt_flag & MNT_ASYNC; 1312 mp->mnt_flag &= ~MNT_ASYNC; 1313 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1314 MNT_IUNLOCK(mp); 1315 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1316 vfs_deallocate_syncvnode(mp); 1317 /* 1318 * For forced unmounts, move process cdir/rdir refs on the fs root 1319 * vnode to the covered vnode. For non-forced unmounts we want 1320 * such references to cause an EBUSY error. 1321 */ 1322 if ((flags & MNT_FORCE) && 1323 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1324 if (mp->mnt_vnodecovered != NULL) 1325 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1326 if (fsrootvp == rootvnode) { 1327 vrele(rootvnode); 1328 rootvnode = NULL; 1329 } 1330 vput(fsrootvp); 1331 } 1332 if (((mp->mnt_flag & MNT_RDONLY) || 1333 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1334 error = VFS_UNMOUNT(mp, flags); 1335 vn_finished_write(mp); 1336 /* 1337 * If we failed to flush the dirty blocks for this mount point, 1338 * undo all the cdir/rdir and rootvnode changes we made above. 1339 * Unless we failed to do so because the device is reporting that 1340 * it doesn't exist anymore. 1341 */ 1342 if (error && error != ENXIO) { 1343 if ((flags & MNT_FORCE) && 1344 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1345 if (mp->mnt_vnodecovered != NULL) 1346 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1347 if (rootvnode == NULL) { 1348 rootvnode = fsrootvp; 1349 vref(rootvnode); 1350 } 1351 vput(fsrootvp); 1352 } 1353 MNT_ILOCK(mp); 1354 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1355 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1356 MNT_IUNLOCK(mp); 1357 vfs_allocate_syncvnode(mp); 1358 MNT_ILOCK(mp); 1359 } 1360 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1361 mp->mnt_flag |= async_flag; 1362 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1363 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1364 mp->mnt_kern_flag |= MNTK_ASYNC; 1365 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1366 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1367 wakeup(mp); 1368 } 1369 MNT_IUNLOCK(mp); 1370 if (coveredvp) 1371 VOP_UNLOCK(coveredvp, 0); 1372 return (error); 1373 } 1374 mtx_lock(&mountlist_mtx); 1375 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1376 mtx_unlock(&mountlist_mtx); 1377 if (coveredvp != NULL) { 1378 coveredvp->v_mountedhere = NULL; 1379 vput(coveredvp); 1380 } 1381 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1382 vfs_mount_destroy(mp); 1383 return (0); 1384 } 1385 1386 /* 1387 * Report errors during filesystem mounting. 1388 */ 1389 void 1390 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1391 { 1392 struct vfsoptlist *moptlist = mp->mnt_optnew; 1393 va_list ap; 1394 int error, len; 1395 char *errmsg; 1396 1397 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1398 if (error || errmsg == NULL || len <= 0) 1399 return; 1400 1401 va_start(ap, fmt); 1402 vsnprintf(errmsg, (size_t)len, fmt, ap); 1403 va_end(ap); 1404 } 1405 1406 void 1407 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1408 { 1409 va_list ap; 1410 int error, len; 1411 char *errmsg; 1412 1413 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1414 if (error || errmsg == NULL || len <= 0) 1415 return; 1416 1417 va_start(ap, fmt); 1418 vsnprintf(errmsg, (size_t)len, fmt, ap); 1419 va_end(ap); 1420 } 1421 1422 /* 1423 * --------------------------------------------------------------------- 1424 * Functions for querying mount options/arguments from filesystems. 1425 */ 1426 1427 /* 1428 * Check that no unknown options are given 1429 */ 1430 int 1431 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1432 { 1433 struct vfsopt *opt; 1434 char errmsg[255]; 1435 const char **t, *p, *q; 1436 int ret = 0; 1437 1438 TAILQ_FOREACH(opt, opts, link) { 1439 p = opt->name; 1440 q = NULL; 1441 if (p[0] == 'n' && p[1] == 'o') 1442 q = p + 2; 1443 for(t = global_opts; *t != NULL; t++) { 1444 if (strcmp(*t, p) == 0) 1445 break; 1446 if (q != NULL) { 1447 if (strcmp(*t, q) == 0) 1448 break; 1449 } 1450 } 1451 if (*t != NULL) 1452 continue; 1453 for(t = legal; *t != NULL; t++) { 1454 if (strcmp(*t, p) == 0) 1455 break; 1456 if (q != NULL) { 1457 if (strcmp(*t, q) == 0) 1458 break; 1459 } 1460 } 1461 if (*t != NULL) 1462 continue; 1463 snprintf(errmsg, sizeof(errmsg), 1464 "mount option <%s> is unknown", p); 1465 ret = EINVAL; 1466 } 1467 if (ret != 0) { 1468 TAILQ_FOREACH(opt, opts, link) { 1469 if (strcmp(opt->name, "errmsg") == 0) { 1470 strncpy((char *)opt->value, errmsg, opt->len); 1471 break; 1472 } 1473 } 1474 if (opt == NULL) 1475 printf("%s\n", errmsg); 1476 } 1477 return (ret); 1478 } 1479 1480 /* 1481 * Get a mount option by its name. 1482 * 1483 * Return 0 if the option was found, ENOENT otherwise. 1484 * If len is non-NULL it will be filled with the length 1485 * of the option. If buf is non-NULL, it will be filled 1486 * with the address of the option. 1487 */ 1488 int 1489 vfs_getopt(opts, name, buf, len) 1490 struct vfsoptlist *opts; 1491 const char *name; 1492 void **buf; 1493 int *len; 1494 { 1495 struct vfsopt *opt; 1496 1497 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1498 1499 TAILQ_FOREACH(opt, opts, link) { 1500 if (strcmp(name, opt->name) == 0) { 1501 opt->seen = 1; 1502 if (len != NULL) 1503 *len = opt->len; 1504 if (buf != NULL) 1505 *buf = opt->value; 1506 return (0); 1507 } 1508 } 1509 return (ENOENT); 1510 } 1511 1512 int 1513 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1514 { 1515 struct vfsopt *opt; 1516 1517 if (opts == NULL) 1518 return (-1); 1519 1520 TAILQ_FOREACH(opt, opts, link) { 1521 if (strcmp(name, opt->name) == 0) { 1522 opt->seen = 1; 1523 return (opt->pos); 1524 } 1525 } 1526 return (-1); 1527 } 1528 1529 int 1530 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1531 { 1532 char *opt_value, *vtp; 1533 quad_t iv; 1534 int error, opt_len; 1535 1536 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1537 if (error != 0) 1538 return (error); 1539 if (opt_len == 0 || opt_value == NULL) 1540 return (EINVAL); 1541 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1542 return (EINVAL); 1543 iv = strtoq(opt_value, &vtp, 0); 1544 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1545 return (EINVAL); 1546 if (iv < 0) 1547 return (EINVAL); 1548 switch (vtp[0]) { 1549 case 't': 1550 case 'T': 1551 iv *= 1024; 1552 case 'g': 1553 case 'G': 1554 iv *= 1024; 1555 case 'm': 1556 case 'M': 1557 iv *= 1024; 1558 case 'k': 1559 case 'K': 1560 iv *= 1024; 1561 case '\0': 1562 break; 1563 default: 1564 return (EINVAL); 1565 } 1566 *value = iv; 1567 1568 return (0); 1569 } 1570 1571 char * 1572 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1573 { 1574 struct vfsopt *opt; 1575 1576 *error = 0; 1577 TAILQ_FOREACH(opt, opts, link) { 1578 if (strcmp(name, opt->name) != 0) 1579 continue; 1580 opt->seen = 1; 1581 if (opt->len == 0 || 1582 ((char *)opt->value)[opt->len - 1] != '\0') { 1583 *error = EINVAL; 1584 return (NULL); 1585 } 1586 return (opt->value); 1587 } 1588 *error = ENOENT; 1589 return (NULL); 1590 } 1591 1592 int 1593 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1594 uint64_t val) 1595 { 1596 struct vfsopt *opt; 1597 1598 TAILQ_FOREACH(opt, opts, link) { 1599 if (strcmp(name, opt->name) == 0) { 1600 opt->seen = 1; 1601 if (w != NULL) 1602 *w |= val; 1603 return (1); 1604 } 1605 } 1606 if (w != NULL) 1607 *w &= ~val; 1608 return (0); 1609 } 1610 1611 int 1612 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1613 { 1614 va_list ap; 1615 struct vfsopt *opt; 1616 int ret; 1617 1618 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1619 1620 TAILQ_FOREACH(opt, opts, link) { 1621 if (strcmp(name, opt->name) != 0) 1622 continue; 1623 opt->seen = 1; 1624 if (opt->len == 0 || opt->value == NULL) 1625 return (0); 1626 if (((char *)opt->value)[opt->len - 1] != '\0') 1627 return (0); 1628 va_start(ap, fmt); 1629 ret = vsscanf(opt->value, fmt, ap); 1630 va_end(ap); 1631 return (ret); 1632 } 1633 return (0); 1634 } 1635 1636 int 1637 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1638 { 1639 struct vfsopt *opt; 1640 1641 TAILQ_FOREACH(opt, opts, link) { 1642 if (strcmp(name, opt->name) != 0) 1643 continue; 1644 opt->seen = 1; 1645 if (opt->value == NULL) 1646 opt->len = len; 1647 else { 1648 if (opt->len != len) 1649 return (EINVAL); 1650 bcopy(value, opt->value, len); 1651 } 1652 return (0); 1653 } 1654 return (ENOENT); 1655 } 1656 1657 int 1658 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1659 { 1660 struct vfsopt *opt; 1661 1662 TAILQ_FOREACH(opt, opts, link) { 1663 if (strcmp(name, opt->name) != 0) 1664 continue; 1665 opt->seen = 1; 1666 if (opt->value == NULL) 1667 opt->len = len; 1668 else { 1669 if (opt->len < len) 1670 return (EINVAL); 1671 opt->len = len; 1672 bcopy(value, opt->value, len); 1673 } 1674 return (0); 1675 } 1676 return (ENOENT); 1677 } 1678 1679 int 1680 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1681 { 1682 struct vfsopt *opt; 1683 1684 TAILQ_FOREACH(opt, opts, link) { 1685 if (strcmp(name, opt->name) != 0) 1686 continue; 1687 opt->seen = 1; 1688 if (opt->value == NULL) 1689 opt->len = strlen(value) + 1; 1690 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1691 return (EINVAL); 1692 return (0); 1693 } 1694 return (ENOENT); 1695 } 1696 1697 /* 1698 * Find and copy a mount option. 1699 * 1700 * The size of the buffer has to be specified 1701 * in len, if it is not the same length as the 1702 * mount option, EINVAL is returned. 1703 * Returns ENOENT if the option is not found. 1704 */ 1705 int 1706 vfs_copyopt(opts, name, dest, len) 1707 struct vfsoptlist *opts; 1708 const char *name; 1709 void *dest; 1710 int len; 1711 { 1712 struct vfsopt *opt; 1713 1714 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1715 1716 TAILQ_FOREACH(opt, opts, link) { 1717 if (strcmp(name, opt->name) == 0) { 1718 opt->seen = 1; 1719 if (len != opt->len) 1720 return (EINVAL); 1721 bcopy(opt->value, dest, opt->len); 1722 return (0); 1723 } 1724 } 1725 return (ENOENT); 1726 } 1727 1728 /* 1729 * These are helper functions for filesystems to traverse all 1730 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h. 1731 * 1732 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL. 1733 */ 1734 1735 MALLOC_DECLARE(M_VNODE_MARKER); 1736 1737 struct vnode * 1738 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1739 { 1740 struct vnode *vp; 1741 1742 mtx_assert(MNT_MTX(mp), MA_OWNED); 1743 1744 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1745 if (should_yield()) { 1746 MNT_IUNLOCK(mp); 1747 kern_yield(PRI_UNCHANGED); 1748 MNT_ILOCK(mp); 1749 } 1750 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1751 while (vp != NULL && vp->v_type == VMARKER) 1752 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1753 1754 /* Check if we are done */ 1755 if (vp == NULL) { 1756 __mnt_vnode_markerfree(mvp, mp); 1757 return (NULL); 1758 } 1759 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1760 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1761 return (vp); 1762 } 1763 1764 struct vnode * 1765 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1766 { 1767 struct vnode *vp; 1768 1769 mtx_assert(MNT_MTX(mp), MA_OWNED); 1770 1771 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1772 while (vp != NULL && vp->v_type == VMARKER) 1773 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1774 1775 /* Check if we are done */ 1776 if (vp == NULL) { 1777 *mvp = NULL; 1778 return (NULL); 1779 } 1780 MNT_REF(mp); 1781 MNT_IUNLOCK(mp); 1782 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1783 M_VNODE_MARKER, 1784 M_WAITOK | M_ZERO); 1785 MNT_ILOCK(mp); 1786 (*mvp)->v_type = VMARKER; 1787 1788 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1789 while (vp != NULL && vp->v_type == VMARKER) 1790 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1791 1792 /* Check if we are done */ 1793 if (vp == NULL) { 1794 MNT_IUNLOCK(mp); 1795 free(*mvp, M_VNODE_MARKER); 1796 MNT_ILOCK(mp); 1797 *mvp = NULL; 1798 MNT_REL(mp); 1799 return (NULL); 1800 } 1801 (*mvp)->v_mount = mp; 1802 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1803 return (vp); 1804 } 1805 1806 1807 void 1808 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1809 { 1810 1811 if (*mvp == NULL) 1812 return; 1813 1814 mtx_assert(MNT_MTX(mp), MA_OWNED); 1815 1816 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1817 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1818 MNT_IUNLOCK(mp); 1819 free(*mvp, M_VNODE_MARKER); 1820 MNT_ILOCK(mp); 1821 *mvp = NULL; 1822 MNT_REL(mp); 1823 } 1824 1825 int 1826 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1827 { 1828 int error; 1829 1830 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1831 if (sbp != &mp->mnt_stat) 1832 *sbp = mp->mnt_stat; 1833 return (error); 1834 } 1835 1836 void 1837 vfs_mountedfrom(struct mount *mp, const char *from) 1838 { 1839 1840 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1841 strlcpy(mp->mnt_stat.f_mntfromname, from, 1842 sizeof mp->mnt_stat.f_mntfromname); 1843 } 1844 1845 /* 1846 * --------------------------------------------------------------------- 1847 * This is the api for building mount args and mounting filesystems from 1848 * inside the kernel. 1849 * 1850 * The API works by accumulation of individual args. First error is 1851 * latched. 1852 * 1853 * XXX: should be documented in new manpage kernel_mount(9) 1854 */ 1855 1856 /* A memory allocation which must be freed when we are done */ 1857 struct mntaarg { 1858 SLIST_ENTRY(mntaarg) next; 1859 }; 1860 1861 /* The header for the mount arguments */ 1862 struct mntarg { 1863 struct iovec *v; 1864 int len; 1865 int error; 1866 SLIST_HEAD(, mntaarg) list; 1867 }; 1868 1869 /* 1870 * Add a boolean argument. 1871 * 1872 * flag is the boolean value. 1873 * name must start with "no". 1874 */ 1875 struct mntarg * 1876 mount_argb(struct mntarg *ma, int flag, const char *name) 1877 { 1878 1879 KASSERT(name[0] == 'n' && name[1] == 'o', 1880 ("mount_argb(...,%s): name must start with 'no'", name)); 1881 1882 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1883 } 1884 1885 /* 1886 * Add an argument printf style 1887 */ 1888 struct mntarg * 1889 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1890 { 1891 va_list ap; 1892 struct mntaarg *maa; 1893 struct sbuf *sb; 1894 int len; 1895 1896 if (ma == NULL) { 1897 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1898 SLIST_INIT(&ma->list); 1899 } 1900 if (ma->error) 1901 return (ma); 1902 1903 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1904 M_MOUNT, M_WAITOK); 1905 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1906 ma->v[ma->len].iov_len = strlen(name) + 1; 1907 ma->len++; 1908 1909 sb = sbuf_new_auto(); 1910 va_start(ap, fmt); 1911 sbuf_vprintf(sb, fmt, ap); 1912 va_end(ap); 1913 sbuf_finish(sb); 1914 len = sbuf_len(sb) + 1; 1915 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1916 SLIST_INSERT_HEAD(&ma->list, maa, next); 1917 bcopy(sbuf_data(sb), maa + 1, len); 1918 sbuf_delete(sb); 1919 1920 ma->v[ma->len].iov_base = maa + 1; 1921 ma->v[ma->len].iov_len = len; 1922 ma->len++; 1923 1924 return (ma); 1925 } 1926 1927 /* 1928 * Add an argument which is a userland string. 1929 */ 1930 struct mntarg * 1931 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1932 { 1933 struct mntaarg *maa; 1934 char *tbuf; 1935 1936 if (val == NULL) 1937 return (ma); 1938 if (ma == NULL) { 1939 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1940 SLIST_INIT(&ma->list); 1941 } 1942 if (ma->error) 1943 return (ma); 1944 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1945 SLIST_INSERT_HEAD(&ma->list, maa, next); 1946 tbuf = (void *)(maa + 1); 1947 ma->error = copyinstr(val, tbuf, len, NULL); 1948 return (mount_arg(ma, name, tbuf, -1)); 1949 } 1950 1951 /* 1952 * Plain argument. 1953 * 1954 * If length is -1, treat value as a C string. 1955 */ 1956 struct mntarg * 1957 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1958 { 1959 1960 if (ma == NULL) { 1961 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1962 SLIST_INIT(&ma->list); 1963 } 1964 if (ma->error) 1965 return (ma); 1966 1967 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1968 M_MOUNT, M_WAITOK); 1969 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1970 ma->v[ma->len].iov_len = strlen(name) + 1; 1971 ma->len++; 1972 1973 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1974 if (len < 0) 1975 ma->v[ma->len].iov_len = strlen(val) + 1; 1976 else 1977 ma->v[ma->len].iov_len = len; 1978 ma->len++; 1979 return (ma); 1980 } 1981 1982 /* 1983 * Free a mntarg structure 1984 */ 1985 static void 1986 free_mntarg(struct mntarg *ma) 1987 { 1988 struct mntaarg *maa; 1989 1990 while (!SLIST_EMPTY(&ma->list)) { 1991 maa = SLIST_FIRST(&ma->list); 1992 SLIST_REMOVE_HEAD(&ma->list, next); 1993 free(maa, M_MOUNT); 1994 } 1995 free(ma->v, M_MOUNT); 1996 free(ma, M_MOUNT); 1997 } 1998 1999 /* 2000 * Mount a filesystem 2001 */ 2002 int 2003 kernel_mount(struct mntarg *ma, uint64_t flags) 2004 { 2005 struct uio auio; 2006 int error; 2007 2008 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2009 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2010 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2011 2012 auio.uio_iov = ma->v; 2013 auio.uio_iovcnt = ma->len; 2014 auio.uio_segflg = UIO_SYSSPACE; 2015 2016 error = ma->error; 2017 if (!error) 2018 error = vfs_donmount(curthread, flags, &auio); 2019 free_mntarg(ma); 2020 return (error); 2021 } 2022 2023 /* 2024 * A printflike function to mount a filesystem. 2025 */ 2026 int 2027 kernel_vmount(int flags, ...) 2028 { 2029 struct mntarg *ma = NULL; 2030 va_list ap; 2031 const char *cp; 2032 const void *vp; 2033 int error; 2034 2035 va_start(ap, flags); 2036 for (;;) { 2037 cp = va_arg(ap, const char *); 2038 if (cp == NULL) 2039 break; 2040 vp = va_arg(ap, const void *); 2041 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2042 } 2043 va_end(ap); 2044 2045 error = kernel_mount(ma, flags); 2046 return (error); 2047 } 2048 2049 void 2050 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2051 { 2052 2053 bcopy(oexp, exp, sizeof(*oexp)); 2054 exp->ex_numsecflavors = 0; 2055 } 2056