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 return (mp); 485 } 486 487 /* 488 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 489 */ 490 void 491 vfs_mount_destroy(struct mount *mp) 492 { 493 494 MNT_ILOCK(mp); 495 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 496 if (mp->mnt_kern_flag & MNTK_MWAIT) { 497 mp->mnt_kern_flag &= ~MNTK_MWAIT; 498 wakeup(mp); 499 } 500 while (mp->mnt_ref) 501 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 502 KASSERT(mp->mnt_ref == 0, 503 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 504 __FILE__, __LINE__)); 505 if (mp->mnt_writeopcount != 0) 506 panic("vfs_mount_destroy: nonzero writeopcount"); 507 if (mp->mnt_secondary_writes != 0) 508 panic("vfs_mount_destroy: nonzero secondary_writes"); 509 mp->mnt_vfc->vfc_refcount--; 510 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 511 struct vnode *vp; 512 513 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 514 vprint("", vp); 515 panic("unmount: dangling vnode"); 516 } 517 if (mp->mnt_nvnodelistsize != 0) 518 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 519 if (mp->mnt_activevnodelistsize != 0) 520 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 521 if (mp->mnt_lockref != 0) 522 panic("vfs_mount_destroy: nonzero lock refcount"); 523 MNT_IUNLOCK(mp); 524 #ifdef MAC 525 mac_mount_destroy(mp); 526 #endif 527 if (mp->mnt_opt != NULL) 528 vfs_freeopts(mp->mnt_opt); 529 crfree(mp->mnt_cred); 530 uma_zfree(mount_zone, mp); 531 } 532 533 int 534 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 535 { 536 struct vfsoptlist *optlist; 537 struct vfsopt *opt, *tmp_opt; 538 char *fstype, *fspath, *errmsg; 539 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 540 541 errmsg = fspath = NULL; 542 errmsg_len = fspathlen = 0; 543 errmsg_pos = -1; 544 545 error = vfs_buildopts(fsoptions, &optlist); 546 if (error) 547 return (error); 548 549 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 550 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 551 552 /* 553 * We need these two options before the others, 554 * and they are mandatory for any filesystem. 555 * Ensure they are NUL terminated as well. 556 */ 557 fstypelen = 0; 558 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 559 if (error || fstype[fstypelen - 1] != '\0') { 560 error = EINVAL; 561 if (errmsg != NULL) 562 strncpy(errmsg, "Invalid fstype", errmsg_len); 563 goto bail; 564 } 565 fspathlen = 0; 566 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 567 if (error || fspath[fspathlen - 1] != '\0') { 568 error = EINVAL; 569 if (errmsg != NULL) 570 strncpy(errmsg, "Invalid fspath", errmsg_len); 571 goto bail; 572 } 573 574 /* 575 * We need to see if we have the "update" option 576 * before we call vfs_domount(), since vfs_domount() has special 577 * logic based on MNT_UPDATE. This is very important 578 * when we want to update the root filesystem. 579 */ 580 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 581 if (strcmp(opt->name, "update") == 0) { 582 fsflags |= MNT_UPDATE; 583 vfs_freeopt(optlist, opt); 584 } 585 else if (strcmp(opt->name, "async") == 0) 586 fsflags |= MNT_ASYNC; 587 else if (strcmp(opt->name, "force") == 0) { 588 fsflags |= MNT_FORCE; 589 vfs_freeopt(optlist, opt); 590 } 591 else if (strcmp(opt->name, "reload") == 0) { 592 fsflags |= MNT_RELOAD; 593 vfs_freeopt(optlist, opt); 594 } 595 else if (strcmp(opt->name, "multilabel") == 0) 596 fsflags |= MNT_MULTILABEL; 597 else if (strcmp(opt->name, "noasync") == 0) 598 fsflags &= ~MNT_ASYNC; 599 else if (strcmp(opt->name, "noatime") == 0) 600 fsflags |= MNT_NOATIME; 601 else if (strcmp(opt->name, "atime") == 0) { 602 free(opt->name, M_MOUNT); 603 opt->name = strdup("nonoatime", M_MOUNT); 604 } 605 else if (strcmp(opt->name, "noclusterr") == 0) 606 fsflags |= MNT_NOCLUSTERR; 607 else if (strcmp(opt->name, "clusterr") == 0) { 608 free(opt->name, M_MOUNT); 609 opt->name = strdup("nonoclusterr", M_MOUNT); 610 } 611 else if (strcmp(opt->name, "noclusterw") == 0) 612 fsflags |= MNT_NOCLUSTERW; 613 else if (strcmp(opt->name, "clusterw") == 0) { 614 free(opt->name, M_MOUNT); 615 opt->name = strdup("nonoclusterw", M_MOUNT); 616 } 617 else if (strcmp(opt->name, "noexec") == 0) 618 fsflags |= MNT_NOEXEC; 619 else if (strcmp(opt->name, "exec") == 0) { 620 free(opt->name, M_MOUNT); 621 opt->name = strdup("nonoexec", M_MOUNT); 622 } 623 else if (strcmp(opt->name, "nosuid") == 0) 624 fsflags |= MNT_NOSUID; 625 else if (strcmp(opt->name, "suid") == 0) { 626 free(opt->name, M_MOUNT); 627 opt->name = strdup("nonosuid", M_MOUNT); 628 } 629 else if (strcmp(opt->name, "nosymfollow") == 0) 630 fsflags |= MNT_NOSYMFOLLOW; 631 else if (strcmp(opt->name, "symfollow") == 0) { 632 free(opt->name, M_MOUNT); 633 opt->name = strdup("nonosymfollow", M_MOUNT); 634 } 635 else if (strcmp(opt->name, "noro") == 0) 636 fsflags &= ~MNT_RDONLY; 637 else if (strcmp(opt->name, "rw") == 0) 638 fsflags &= ~MNT_RDONLY; 639 else if (strcmp(opt->name, "ro") == 0) 640 fsflags |= MNT_RDONLY; 641 else if (strcmp(opt->name, "rdonly") == 0) { 642 free(opt->name, M_MOUNT); 643 opt->name = strdup("ro", M_MOUNT); 644 fsflags |= MNT_RDONLY; 645 } 646 else if (strcmp(opt->name, "suiddir") == 0) 647 fsflags |= MNT_SUIDDIR; 648 else if (strcmp(opt->name, "sync") == 0) 649 fsflags |= MNT_SYNCHRONOUS; 650 else if (strcmp(opt->name, "union") == 0) 651 fsflags |= MNT_UNION; 652 } 653 654 /* 655 * Be ultra-paranoid about making sure the type and fspath 656 * variables will fit in our mp buffers, including the 657 * terminating NUL. 658 */ 659 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 660 error = ENAMETOOLONG; 661 goto bail; 662 } 663 664 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 665 bail: 666 /* copyout the errmsg */ 667 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 668 && errmsg_len > 0 && errmsg != NULL) { 669 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 670 bcopy(errmsg, 671 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 672 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 673 } else { 674 copyout(errmsg, 675 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 677 } 678 } 679 680 if (optlist != NULL) 681 vfs_freeopts(optlist); 682 return (error); 683 } 684 685 /* 686 * Old mount API. 687 */ 688 #ifndef _SYS_SYSPROTO_H_ 689 struct mount_args { 690 char *type; 691 char *path; 692 int flags; 693 caddr_t data; 694 }; 695 #endif 696 /* ARGSUSED */ 697 int 698 sys_mount(td, uap) 699 struct thread *td; 700 struct mount_args /* { 701 char *type; 702 char *path; 703 int flags; 704 caddr_t data; 705 } */ *uap; 706 { 707 char *fstype; 708 struct vfsconf *vfsp = NULL; 709 struct mntarg *ma = NULL; 710 uint64_t flags; 711 int error; 712 713 /* 714 * Mount flags are now 64-bits. On 32-bit archtectures only 715 * 32-bits are passed in, but from here on everything handles 716 * 64-bit flags correctly. 717 */ 718 flags = uap->flags; 719 720 AUDIT_ARG_FFLAGS(flags); 721 722 /* 723 * Filter out MNT_ROOTFS. We do not want clients of mount() in 724 * userspace to set this flag, but we must filter it out if we want 725 * MNT_UPDATE on the root file system to work. 726 * MNT_ROOTFS should only be set by the kernel when mounting its 727 * root file system. 728 */ 729 flags &= ~MNT_ROOTFS; 730 731 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 732 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 733 if (error) { 734 free(fstype, M_TEMP); 735 return (error); 736 } 737 738 AUDIT_ARG_TEXT(fstype); 739 mtx_lock(&Giant); 740 vfsp = vfs_byname_kld(fstype, td, &error); 741 free(fstype, M_TEMP); 742 if (vfsp == NULL) { 743 mtx_unlock(&Giant); 744 return (ENOENT); 745 } 746 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 747 mtx_unlock(&Giant); 748 return (EOPNOTSUPP); 749 } 750 751 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 752 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 753 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 754 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 755 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 756 757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags); 758 mtx_unlock(&Giant); 759 return (error); 760 } 761 762 /* 763 * vfs_domount_first(): first file system mount (not update) 764 */ 765 static int 766 vfs_domount_first( 767 struct thread *td, /* Calling thread. */ 768 struct vfsconf *vfsp, /* File system type. */ 769 char *fspath, /* Mount path. */ 770 struct vnode *vp, /* Vnode to be covered. */ 771 uint64_t fsflags, /* Flags common to all filesystems. */ 772 struct vfsoptlist **optlist /* Options local to the filesystem. */ 773 ) 774 { 775 struct vattr va; 776 struct mount *mp; 777 struct vnode *newdp; 778 int error; 779 780 mtx_assert(&Giant, MA_OWNED); 781 ASSERT_VOP_ELOCKED(vp, __func__); 782 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 783 784 /* 785 * If the user is not root, ensure that they own the directory 786 * onto which we are attempting to mount. 787 */ 788 error = VOP_GETATTR(vp, &va, td->td_ucred); 789 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 790 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0); 791 if (error == 0) 792 error = vinvalbuf(vp, V_SAVE, 0, 0); 793 if (error == 0 && vp->v_type != VDIR) 794 error = ENOTDIR; 795 if (error == 0) { 796 VI_LOCK(vp); 797 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 798 vp->v_iflag |= VI_MOUNT; 799 else 800 error = EBUSY; 801 VI_UNLOCK(vp); 802 } 803 if (error != 0) { 804 vput(vp); 805 return (error); 806 } 807 VOP_UNLOCK(vp, 0); 808 809 /* Allocate and initialize the filesystem. */ 810 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 811 /* XXXMAC: pass to vfs_mount_alloc? */ 812 mp->mnt_optnew = *optlist; 813 /* Set the mount level flags. */ 814 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 815 816 /* 817 * Mount the filesystem. 818 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 819 * get. No freeing of cn_pnbuf. 820 */ 821 error = VFS_MOUNT(mp); 822 #ifndef VFS_ALLOW_NONMPSAFE 823 if (error == 0 && VFS_NEEDSGIANT(mp)) { 824 (void)VFS_UNMOUNT(mp, fsflags); 825 error = ENXIO; 826 printf("%s: Mounting non-MPSAFE fs (%s) is disabled\n", 827 __func__, mp->mnt_vfc->vfc_name); 828 } 829 #endif 830 if (error != 0) { 831 vfs_unbusy(mp); 832 vfs_mount_destroy(mp); 833 VI_LOCK(vp); 834 vp->v_iflag &= ~VI_MOUNT; 835 VI_UNLOCK(vp); 836 vrele(vp); 837 return (error); 838 } 839 #ifdef VFS_ALLOW_NONMPSAFE 840 if (VFS_NEEDSGIANT(mp)) 841 printf("%s: Mounting non-MPSAFE fs (%s) is deprecated\n", 842 __func__, mp->mnt_vfc->vfc_name); 843 #endif 844 845 if (mp->mnt_opt != NULL) 846 vfs_freeopts(mp->mnt_opt); 847 mp->mnt_opt = mp->mnt_optnew; 848 *optlist = NULL; 849 (void)VFS_STATFS(mp, &mp->mnt_stat); 850 851 /* 852 * Prevent external consumers of mount options from reading mnt_optnew. 853 */ 854 mp->mnt_optnew = NULL; 855 856 MNT_ILOCK(mp); 857 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 858 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 859 mp->mnt_kern_flag |= MNTK_ASYNC; 860 else 861 mp->mnt_kern_flag &= ~MNTK_ASYNC; 862 MNT_IUNLOCK(mp); 863 864 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 865 cache_purge(vp); 866 VI_LOCK(vp); 867 vp->v_iflag &= ~VI_MOUNT; 868 VI_UNLOCK(vp); 869 vp->v_mountedhere = mp; 870 /* Place the new filesystem at the end of the mount list. */ 871 mtx_lock(&mountlist_mtx); 872 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 873 mtx_unlock(&mountlist_mtx); 874 vfs_event_signal(NULL, VQ_MOUNT, 0); 875 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 876 panic("mount: lost mount"); 877 VOP_UNLOCK(newdp, 0); 878 VOP_UNLOCK(vp, 0); 879 mountcheckdirs(vp, newdp); 880 vrele(newdp); 881 if ((mp->mnt_flag & MNT_RDONLY) == 0) 882 vfs_allocate_syncvnode(mp); 883 vfs_unbusy(mp); 884 return (0); 885 } 886 887 /* 888 * vfs_domount_update(): update of mounted file system 889 */ 890 static int 891 vfs_domount_update( 892 struct thread *td, /* Calling thread. */ 893 struct vnode *vp, /* Mount point vnode. */ 894 uint64_t fsflags, /* Flags common to all filesystems. */ 895 struct vfsoptlist **optlist /* Options local to the filesystem. */ 896 ) 897 { 898 struct oexport_args oexport; 899 struct export_args export; 900 struct mount *mp; 901 int error, export_error; 902 uint64_t flag; 903 904 mtx_assert(&Giant, MA_OWNED); 905 ASSERT_VOP_ELOCKED(vp, __func__); 906 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 907 908 if ((vp->v_vflag & VV_ROOT) == 0) { 909 vput(vp); 910 return (EINVAL); 911 } 912 mp = vp->v_mount; 913 /* 914 * We only allow the filesystem to be reloaded if it 915 * is currently mounted read-only. 916 */ 917 flag = mp->mnt_flag; 918 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 919 vput(vp); 920 return (EOPNOTSUPP); /* Needs translation */ 921 } 922 /* 923 * Only privileged root, or (if MNT_USER is set) the user that 924 * did the original mount is permitted to update it. 925 */ 926 error = vfs_suser(mp, td); 927 if (error != 0) { 928 vput(vp); 929 return (error); 930 } 931 if (vfs_busy(mp, MBF_NOWAIT)) { 932 vput(vp); 933 return (EBUSY); 934 } 935 VI_LOCK(vp); 936 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 937 VI_UNLOCK(vp); 938 vfs_unbusy(mp); 939 vput(vp); 940 return (EBUSY); 941 } 942 vp->v_iflag |= VI_MOUNT; 943 VI_UNLOCK(vp); 944 VOP_UNLOCK(vp, 0); 945 946 MNT_ILOCK(mp); 947 mp->mnt_flag &= ~MNT_UPDATEMASK; 948 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 949 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 950 if ((mp->mnt_flag & MNT_ASYNC) == 0) 951 mp->mnt_kern_flag &= ~MNTK_ASYNC; 952 MNT_IUNLOCK(mp); 953 mp->mnt_optnew = *optlist; 954 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 955 956 /* 957 * Mount the filesystem. 958 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 959 * get. No freeing of cn_pnbuf. 960 */ 961 error = VFS_MOUNT(mp); 962 963 export_error = 0; 964 if (error == 0) { 965 /* Process the export option. */ 966 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 967 sizeof(export)) == 0) { 968 export_error = vfs_export(mp, &export); 969 } else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 970 sizeof(oexport)) == 0) { 971 export.ex_flags = oexport.ex_flags; 972 export.ex_root = oexport.ex_root; 973 export.ex_anon = oexport.ex_anon; 974 export.ex_addr = oexport.ex_addr; 975 export.ex_addrlen = oexport.ex_addrlen; 976 export.ex_mask = oexport.ex_mask; 977 export.ex_masklen = oexport.ex_masklen; 978 export.ex_indexfile = oexport.ex_indexfile; 979 export.ex_numsecflavors = 0; 980 export_error = vfs_export(mp, &export); 981 } 982 } 983 984 MNT_ILOCK(mp); 985 if (error == 0) { 986 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 987 MNT_SNAPSHOT); 988 } else { 989 /* 990 * If we fail, restore old mount flags. MNT_QUOTA is special, 991 * because it is not part of MNT_UPDATEMASK, but it could have 992 * changed in the meantime if quotactl(2) was called. 993 * All in all we want current value of MNT_QUOTA, not the old 994 * one. 995 */ 996 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 997 } 998 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 999 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1000 mp->mnt_kern_flag |= MNTK_ASYNC; 1001 else 1002 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1003 MNT_IUNLOCK(mp); 1004 1005 if (error != 0) 1006 goto end; 1007 1008 if (mp->mnt_opt != NULL) 1009 vfs_freeopts(mp->mnt_opt); 1010 mp->mnt_opt = mp->mnt_optnew; 1011 *optlist = NULL; 1012 (void)VFS_STATFS(mp, &mp->mnt_stat); 1013 /* 1014 * Prevent external consumers of mount options from reading 1015 * mnt_optnew. 1016 */ 1017 mp->mnt_optnew = NULL; 1018 1019 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1020 vfs_allocate_syncvnode(mp); 1021 else 1022 vfs_deallocate_syncvnode(mp); 1023 end: 1024 vfs_unbusy(mp); 1025 VI_LOCK(vp); 1026 vp->v_iflag &= ~VI_MOUNT; 1027 VI_UNLOCK(vp); 1028 vrele(vp); 1029 return (error != 0 ? error : export_error); 1030 } 1031 1032 /* 1033 * vfs_domount(): actually attempt a filesystem mount. 1034 */ 1035 static int 1036 vfs_domount( 1037 struct thread *td, /* Calling thread. */ 1038 const char *fstype, /* Filesystem type. */ 1039 char *fspath, /* Mount path. */ 1040 uint64_t fsflags, /* Flags common to all filesystems. */ 1041 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1042 ) 1043 { 1044 struct vfsconf *vfsp; 1045 struct nameidata nd; 1046 struct vnode *vp; 1047 char *pathbuf; 1048 int error; 1049 1050 /* 1051 * Be ultra-paranoid about making sure the type and fspath 1052 * variables will fit in our mp buffers, including the 1053 * terminating NUL. 1054 */ 1055 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1056 return (ENAMETOOLONG); 1057 1058 if (jailed(td->td_ucred) || usermount == 0) { 1059 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1060 return (error); 1061 } 1062 1063 /* 1064 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1065 */ 1066 if (fsflags & MNT_EXPORTED) { 1067 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1068 if (error) 1069 return (error); 1070 } 1071 if (fsflags & MNT_SUIDDIR) { 1072 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1073 if (error) 1074 return (error); 1075 } 1076 /* 1077 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1078 */ 1079 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1080 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1081 fsflags |= MNT_NOSUID | MNT_USER; 1082 } 1083 1084 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1085 vfsp = NULL; 1086 if ((fsflags & MNT_UPDATE) == 0) { 1087 /* Don't try to load KLDs if we're mounting the root. */ 1088 if (fsflags & MNT_ROOTFS) 1089 vfsp = vfs_byname(fstype); 1090 else 1091 vfsp = vfs_byname_kld(fstype, td, &error); 1092 if (vfsp == NULL) 1093 return (ENODEV); 1094 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 1095 return (EPERM); 1096 } 1097 1098 /* 1099 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1100 */ 1101 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1102 UIO_SYSSPACE, fspath, td); 1103 error = namei(&nd); 1104 if (error != 0) 1105 return (error); 1106 if (!NDHASGIANT(&nd)) 1107 mtx_lock(&Giant); 1108 NDFREE(&nd, NDF_ONLY_PNBUF); 1109 vp = nd.ni_vp; 1110 if ((fsflags & MNT_UPDATE) == 0) { 1111 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1112 strcpy(pathbuf, fspath); 1113 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1114 /* debug.disablefullpath == 1 results in ENODEV */ 1115 if (error == 0 || error == ENODEV) { 1116 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1117 fsflags, optlist); 1118 } 1119 free(pathbuf, M_TEMP); 1120 } else 1121 error = vfs_domount_update(td, vp, fsflags, optlist); 1122 mtx_unlock(&Giant); 1123 1124 ASSERT_VI_UNLOCKED(vp, __func__); 1125 ASSERT_VOP_UNLOCKED(vp, __func__); 1126 1127 return (error); 1128 } 1129 1130 /* 1131 * Unmount a filesystem. 1132 * 1133 * Note: unmount takes a path to the vnode mounted on as argument, not 1134 * special file (as before). 1135 */ 1136 #ifndef _SYS_SYSPROTO_H_ 1137 struct unmount_args { 1138 char *path; 1139 int flags; 1140 }; 1141 #endif 1142 /* ARGSUSED */ 1143 int 1144 sys_unmount(td, uap) 1145 struct thread *td; 1146 register struct unmount_args /* { 1147 char *path; 1148 int flags; 1149 } */ *uap; 1150 { 1151 struct nameidata nd; 1152 struct mount *mp; 1153 char *pathbuf; 1154 int error, id0, id1, vfslocked; 1155 1156 AUDIT_ARG_VALUE(uap->flags); 1157 if (jailed(td->td_ucred) || usermount == 0) { 1158 error = priv_check(td, PRIV_VFS_UNMOUNT); 1159 if (error) 1160 return (error); 1161 } 1162 1163 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1164 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1165 if (error) { 1166 free(pathbuf, M_TEMP); 1167 return (error); 1168 } 1169 mtx_lock(&Giant); 1170 if (uap->flags & MNT_BYFSID) { 1171 AUDIT_ARG_TEXT(pathbuf); 1172 /* Decode the filesystem ID. */ 1173 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1174 mtx_unlock(&Giant); 1175 free(pathbuf, M_TEMP); 1176 return (EINVAL); 1177 } 1178 1179 mtx_lock(&mountlist_mtx); 1180 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1181 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1182 mp->mnt_stat.f_fsid.val[1] == id1) 1183 break; 1184 } 1185 mtx_unlock(&mountlist_mtx); 1186 } else { 1187 AUDIT_ARG_UPATH1(td, pathbuf); 1188 /* 1189 * Try to find global path for path argument. 1190 */ 1191 NDINIT(&nd, LOOKUP, 1192 FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1, 1193 UIO_SYSSPACE, pathbuf, td); 1194 if (namei(&nd) == 0) { 1195 vfslocked = NDHASGIANT(&nd); 1196 NDFREE(&nd, NDF_ONLY_PNBUF); 1197 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1198 MNAMELEN); 1199 if (error == 0 || error == ENODEV) 1200 vput(nd.ni_vp); 1201 VFS_UNLOCK_GIANT(vfslocked); 1202 } 1203 mtx_lock(&mountlist_mtx); 1204 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1205 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1206 break; 1207 } 1208 mtx_unlock(&mountlist_mtx); 1209 } 1210 free(pathbuf, M_TEMP); 1211 if (mp == NULL) { 1212 /* 1213 * Previously we returned ENOENT for a nonexistent path and 1214 * EINVAL for a non-mountpoint. We cannot tell these apart 1215 * now, so in the !MNT_BYFSID case return the more likely 1216 * EINVAL for compatibility. 1217 */ 1218 mtx_unlock(&Giant); 1219 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1220 } 1221 1222 /* 1223 * Don't allow unmounting the root filesystem. 1224 */ 1225 if (mp->mnt_flag & MNT_ROOTFS) { 1226 mtx_unlock(&Giant); 1227 return (EINVAL); 1228 } 1229 error = dounmount(mp, uap->flags, td); 1230 mtx_unlock(&Giant); 1231 return (error); 1232 } 1233 1234 /* 1235 * Do the actual filesystem unmount. 1236 */ 1237 int 1238 dounmount(mp, flags, td) 1239 struct mount *mp; 1240 int flags; 1241 struct thread *td; 1242 { 1243 struct vnode *coveredvp, *fsrootvp; 1244 int error; 1245 uint64_t async_flag; 1246 int mnt_gen_r; 1247 1248 mtx_assert(&Giant, MA_OWNED); 1249 1250 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1251 mnt_gen_r = mp->mnt_gen; 1252 VI_LOCK(coveredvp); 1253 vholdl(coveredvp); 1254 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1255 vdrop(coveredvp); 1256 /* 1257 * Check for mp being unmounted while waiting for the 1258 * covered vnode lock. 1259 */ 1260 if (coveredvp->v_mountedhere != mp || 1261 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1262 VOP_UNLOCK(coveredvp, 0); 1263 return (EBUSY); 1264 } 1265 } 1266 /* 1267 * Only privileged root, or (if MNT_USER is set) the user that did the 1268 * original mount is permitted to unmount this filesystem. 1269 */ 1270 error = vfs_suser(mp, td); 1271 if (error) { 1272 if (coveredvp) 1273 VOP_UNLOCK(coveredvp, 0); 1274 return (error); 1275 } 1276 1277 MNT_ILOCK(mp); 1278 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1279 MNT_IUNLOCK(mp); 1280 if (coveredvp) 1281 VOP_UNLOCK(coveredvp, 0); 1282 return (EBUSY); 1283 } 1284 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1285 /* Allow filesystems to detect that a forced unmount is in progress. */ 1286 if (flags & MNT_FORCE) 1287 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1288 error = 0; 1289 if (mp->mnt_lockref) { 1290 mp->mnt_kern_flag |= MNTK_DRAINING; 1291 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1292 "mount drain", 0); 1293 } 1294 MNT_IUNLOCK(mp); 1295 KASSERT(mp->mnt_lockref == 0, 1296 ("%s: invalid lock refcount in the drain path @ %s:%d", 1297 __func__, __FILE__, __LINE__)); 1298 KASSERT(error == 0, 1299 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1300 __func__, __FILE__, __LINE__)); 1301 vn_start_write(NULL, &mp, V_WAIT); 1302 1303 if (mp->mnt_flag & MNT_EXPUBLIC) 1304 vfs_setpublicfs(NULL, NULL, NULL); 1305 1306 vfs_msync(mp, MNT_WAIT); 1307 MNT_ILOCK(mp); 1308 async_flag = mp->mnt_flag & MNT_ASYNC; 1309 mp->mnt_flag &= ~MNT_ASYNC; 1310 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1311 MNT_IUNLOCK(mp); 1312 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1313 vfs_deallocate_syncvnode(mp); 1314 /* 1315 * For forced unmounts, move process cdir/rdir refs on the fs root 1316 * vnode to the covered vnode. For non-forced unmounts we want 1317 * such references to cause an EBUSY error. 1318 */ 1319 if ((flags & MNT_FORCE) && 1320 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1321 if (mp->mnt_vnodecovered != NULL) 1322 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1323 if (fsrootvp == rootvnode) { 1324 vrele(rootvnode); 1325 rootvnode = NULL; 1326 } 1327 vput(fsrootvp); 1328 } 1329 if (((mp->mnt_flag & MNT_RDONLY) || 1330 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1331 error = VFS_UNMOUNT(mp, flags); 1332 vn_finished_write(mp); 1333 /* 1334 * If we failed to flush the dirty blocks for this mount point, 1335 * undo all the cdir/rdir and rootvnode changes we made above. 1336 * Unless we failed to do so because the device is reporting that 1337 * it doesn't exist anymore. 1338 */ 1339 if (error && error != ENXIO) { 1340 if ((flags & MNT_FORCE) && 1341 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1342 if (mp->mnt_vnodecovered != NULL) 1343 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1344 if (rootvnode == NULL) { 1345 rootvnode = fsrootvp; 1346 vref(rootvnode); 1347 } 1348 vput(fsrootvp); 1349 } 1350 MNT_ILOCK(mp); 1351 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1352 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1353 MNT_IUNLOCK(mp); 1354 vfs_allocate_syncvnode(mp); 1355 MNT_ILOCK(mp); 1356 } 1357 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1358 mp->mnt_flag |= async_flag; 1359 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1360 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1361 mp->mnt_kern_flag |= MNTK_ASYNC; 1362 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1363 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1364 wakeup(mp); 1365 } 1366 MNT_IUNLOCK(mp); 1367 if (coveredvp) 1368 VOP_UNLOCK(coveredvp, 0); 1369 return (error); 1370 } 1371 mtx_lock(&mountlist_mtx); 1372 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1373 mtx_unlock(&mountlist_mtx); 1374 if (coveredvp != NULL) { 1375 coveredvp->v_mountedhere = NULL; 1376 vput(coveredvp); 1377 } 1378 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1379 vfs_mount_destroy(mp); 1380 return (0); 1381 } 1382 1383 /* 1384 * Report errors during filesystem mounting. 1385 */ 1386 void 1387 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1388 { 1389 struct vfsoptlist *moptlist = mp->mnt_optnew; 1390 va_list ap; 1391 int error, len; 1392 char *errmsg; 1393 1394 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1395 if (error || errmsg == NULL || len <= 0) 1396 return; 1397 1398 va_start(ap, fmt); 1399 vsnprintf(errmsg, (size_t)len, fmt, ap); 1400 va_end(ap); 1401 } 1402 1403 void 1404 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1405 { 1406 va_list ap; 1407 int error, len; 1408 char *errmsg; 1409 1410 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1411 if (error || errmsg == NULL || len <= 0) 1412 return; 1413 1414 va_start(ap, fmt); 1415 vsnprintf(errmsg, (size_t)len, fmt, ap); 1416 va_end(ap); 1417 } 1418 1419 /* 1420 * --------------------------------------------------------------------- 1421 * Functions for querying mount options/arguments from filesystems. 1422 */ 1423 1424 /* 1425 * Check that no unknown options are given 1426 */ 1427 int 1428 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1429 { 1430 struct vfsopt *opt; 1431 char errmsg[255]; 1432 const char **t, *p, *q; 1433 int ret = 0; 1434 1435 TAILQ_FOREACH(opt, opts, link) { 1436 p = opt->name; 1437 q = NULL; 1438 if (p[0] == 'n' && p[1] == 'o') 1439 q = p + 2; 1440 for(t = global_opts; *t != NULL; t++) { 1441 if (strcmp(*t, p) == 0) 1442 break; 1443 if (q != NULL) { 1444 if (strcmp(*t, q) == 0) 1445 break; 1446 } 1447 } 1448 if (*t != NULL) 1449 continue; 1450 for(t = legal; *t != NULL; t++) { 1451 if (strcmp(*t, p) == 0) 1452 break; 1453 if (q != NULL) { 1454 if (strcmp(*t, q) == 0) 1455 break; 1456 } 1457 } 1458 if (*t != NULL) 1459 continue; 1460 snprintf(errmsg, sizeof(errmsg), 1461 "mount option <%s> is unknown", p); 1462 ret = EINVAL; 1463 } 1464 if (ret != 0) { 1465 TAILQ_FOREACH(opt, opts, link) { 1466 if (strcmp(opt->name, "errmsg") == 0) { 1467 strncpy((char *)opt->value, errmsg, opt->len); 1468 break; 1469 } 1470 } 1471 if (opt == NULL) 1472 printf("%s\n", errmsg); 1473 } 1474 return (ret); 1475 } 1476 1477 /* 1478 * Get a mount option by its name. 1479 * 1480 * Return 0 if the option was found, ENOENT otherwise. 1481 * If len is non-NULL it will be filled with the length 1482 * of the option. If buf is non-NULL, it will be filled 1483 * with the address of the option. 1484 */ 1485 int 1486 vfs_getopt(opts, name, buf, len) 1487 struct vfsoptlist *opts; 1488 const char *name; 1489 void **buf; 1490 int *len; 1491 { 1492 struct vfsopt *opt; 1493 1494 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1495 1496 TAILQ_FOREACH(opt, opts, link) { 1497 if (strcmp(name, opt->name) == 0) { 1498 opt->seen = 1; 1499 if (len != NULL) 1500 *len = opt->len; 1501 if (buf != NULL) 1502 *buf = opt->value; 1503 return (0); 1504 } 1505 } 1506 return (ENOENT); 1507 } 1508 1509 int 1510 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1511 { 1512 struct vfsopt *opt; 1513 1514 if (opts == NULL) 1515 return (-1); 1516 1517 TAILQ_FOREACH(opt, opts, link) { 1518 if (strcmp(name, opt->name) == 0) { 1519 opt->seen = 1; 1520 return (opt->pos); 1521 } 1522 } 1523 return (-1); 1524 } 1525 1526 int 1527 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1528 { 1529 char *opt_value, *vtp; 1530 quad_t iv; 1531 int error, opt_len; 1532 1533 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1534 if (error != 0) 1535 return (error); 1536 if (opt_len == 0 || opt_value == NULL) 1537 return (EINVAL); 1538 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1539 return (EINVAL); 1540 iv = strtoq(opt_value, &vtp, 0); 1541 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1542 return (EINVAL); 1543 if (iv < 0) 1544 return (EINVAL); 1545 switch (vtp[0]) { 1546 case 't': 1547 case 'T': 1548 iv *= 1024; 1549 case 'g': 1550 case 'G': 1551 iv *= 1024; 1552 case 'm': 1553 case 'M': 1554 iv *= 1024; 1555 case 'k': 1556 case 'K': 1557 iv *= 1024; 1558 case '\0': 1559 break; 1560 default: 1561 return (EINVAL); 1562 } 1563 *value = iv; 1564 1565 return (0); 1566 } 1567 1568 char * 1569 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1570 { 1571 struct vfsopt *opt; 1572 1573 *error = 0; 1574 TAILQ_FOREACH(opt, opts, link) { 1575 if (strcmp(name, opt->name) != 0) 1576 continue; 1577 opt->seen = 1; 1578 if (opt->len == 0 || 1579 ((char *)opt->value)[opt->len - 1] != '\0') { 1580 *error = EINVAL; 1581 return (NULL); 1582 } 1583 return (opt->value); 1584 } 1585 *error = ENOENT; 1586 return (NULL); 1587 } 1588 1589 int 1590 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1591 uint64_t val) 1592 { 1593 struct vfsopt *opt; 1594 1595 TAILQ_FOREACH(opt, opts, link) { 1596 if (strcmp(name, opt->name) == 0) { 1597 opt->seen = 1; 1598 if (w != NULL) 1599 *w |= val; 1600 return (1); 1601 } 1602 } 1603 if (w != NULL) 1604 *w &= ~val; 1605 return (0); 1606 } 1607 1608 int 1609 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1610 { 1611 va_list ap; 1612 struct vfsopt *opt; 1613 int ret; 1614 1615 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1616 1617 TAILQ_FOREACH(opt, opts, link) { 1618 if (strcmp(name, opt->name) != 0) 1619 continue; 1620 opt->seen = 1; 1621 if (opt->len == 0 || opt->value == NULL) 1622 return (0); 1623 if (((char *)opt->value)[opt->len - 1] != '\0') 1624 return (0); 1625 va_start(ap, fmt); 1626 ret = vsscanf(opt->value, fmt, ap); 1627 va_end(ap); 1628 return (ret); 1629 } 1630 return (0); 1631 } 1632 1633 int 1634 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1635 { 1636 struct vfsopt *opt; 1637 1638 TAILQ_FOREACH(opt, opts, link) { 1639 if (strcmp(name, opt->name) != 0) 1640 continue; 1641 opt->seen = 1; 1642 if (opt->value == NULL) 1643 opt->len = len; 1644 else { 1645 if (opt->len != len) 1646 return (EINVAL); 1647 bcopy(value, opt->value, len); 1648 } 1649 return (0); 1650 } 1651 return (ENOENT); 1652 } 1653 1654 int 1655 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1656 { 1657 struct vfsopt *opt; 1658 1659 TAILQ_FOREACH(opt, opts, link) { 1660 if (strcmp(name, opt->name) != 0) 1661 continue; 1662 opt->seen = 1; 1663 if (opt->value == NULL) 1664 opt->len = len; 1665 else { 1666 if (opt->len < len) 1667 return (EINVAL); 1668 opt->len = len; 1669 bcopy(value, opt->value, len); 1670 } 1671 return (0); 1672 } 1673 return (ENOENT); 1674 } 1675 1676 int 1677 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1678 { 1679 struct vfsopt *opt; 1680 1681 TAILQ_FOREACH(opt, opts, link) { 1682 if (strcmp(name, opt->name) != 0) 1683 continue; 1684 opt->seen = 1; 1685 if (opt->value == NULL) 1686 opt->len = strlen(value) + 1; 1687 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1688 return (EINVAL); 1689 return (0); 1690 } 1691 return (ENOENT); 1692 } 1693 1694 /* 1695 * Find and copy a mount option. 1696 * 1697 * The size of the buffer has to be specified 1698 * in len, if it is not the same length as the 1699 * mount option, EINVAL is returned. 1700 * Returns ENOENT if the option is not found. 1701 */ 1702 int 1703 vfs_copyopt(opts, name, dest, len) 1704 struct vfsoptlist *opts; 1705 const char *name; 1706 void *dest; 1707 int len; 1708 { 1709 struct vfsopt *opt; 1710 1711 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1712 1713 TAILQ_FOREACH(opt, opts, link) { 1714 if (strcmp(name, opt->name) == 0) { 1715 opt->seen = 1; 1716 if (len != opt->len) 1717 return (EINVAL); 1718 bcopy(opt->value, dest, opt->len); 1719 return (0); 1720 } 1721 } 1722 return (ENOENT); 1723 } 1724 1725 /* 1726 * These are helper functions for filesystems to traverse all 1727 * their vnodes. See MNT_VNODE_FOREACH() in sys/mount.h. 1728 * 1729 * This interface has been deprecated in favor of MNT_VNODE_FOREACH_ALL. 1730 */ 1731 1732 MALLOC_DECLARE(M_VNODE_MARKER); 1733 1734 struct vnode * 1735 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1736 { 1737 struct vnode *vp; 1738 1739 mtx_assert(MNT_MTX(mp), MA_OWNED); 1740 1741 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1742 if (should_yield()) { 1743 MNT_IUNLOCK(mp); 1744 kern_yield(PRI_UNCHANGED); 1745 MNT_ILOCK(mp); 1746 } 1747 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1748 while (vp != NULL && vp->v_type == VMARKER) 1749 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1750 1751 /* Check if we are done */ 1752 if (vp == NULL) { 1753 __mnt_vnode_markerfree(mvp, mp); 1754 return (NULL); 1755 } 1756 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1757 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1758 return (vp); 1759 } 1760 1761 struct vnode * 1762 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1763 { 1764 struct vnode *vp; 1765 1766 mtx_assert(MNT_MTX(mp), MA_OWNED); 1767 1768 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1769 while (vp != NULL && vp->v_type == VMARKER) 1770 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1771 1772 /* Check if we are done */ 1773 if (vp == NULL) { 1774 *mvp = NULL; 1775 return (NULL); 1776 } 1777 MNT_REF(mp); 1778 MNT_IUNLOCK(mp); 1779 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1780 M_VNODE_MARKER, 1781 M_WAITOK | M_ZERO); 1782 MNT_ILOCK(mp); 1783 (*mvp)->v_type = VMARKER; 1784 1785 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1786 while (vp != NULL && vp->v_type == VMARKER) 1787 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1788 1789 /* Check if we are done */ 1790 if (vp == NULL) { 1791 MNT_IUNLOCK(mp); 1792 free(*mvp, M_VNODE_MARKER); 1793 MNT_ILOCK(mp); 1794 *mvp = NULL; 1795 MNT_REL(mp); 1796 return (NULL); 1797 } 1798 (*mvp)->v_mount = mp; 1799 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1800 return (vp); 1801 } 1802 1803 1804 void 1805 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1806 { 1807 1808 if (*mvp == NULL) 1809 return; 1810 1811 mtx_assert(MNT_MTX(mp), MA_OWNED); 1812 1813 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1814 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1815 MNT_IUNLOCK(mp); 1816 free(*mvp, M_VNODE_MARKER); 1817 MNT_ILOCK(mp); 1818 *mvp = NULL; 1819 MNT_REL(mp); 1820 } 1821 1822 int 1823 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1824 { 1825 int error; 1826 1827 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1828 if (sbp != &mp->mnt_stat) 1829 *sbp = mp->mnt_stat; 1830 return (error); 1831 } 1832 1833 void 1834 vfs_mountedfrom(struct mount *mp, const char *from) 1835 { 1836 1837 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1838 strlcpy(mp->mnt_stat.f_mntfromname, from, 1839 sizeof mp->mnt_stat.f_mntfromname); 1840 } 1841 1842 /* 1843 * --------------------------------------------------------------------- 1844 * This is the api for building mount args and mounting filesystems from 1845 * inside the kernel. 1846 * 1847 * The API works by accumulation of individual args. First error is 1848 * latched. 1849 * 1850 * XXX: should be documented in new manpage kernel_mount(9) 1851 */ 1852 1853 /* A memory allocation which must be freed when we are done */ 1854 struct mntaarg { 1855 SLIST_ENTRY(mntaarg) next; 1856 }; 1857 1858 /* The header for the mount arguments */ 1859 struct mntarg { 1860 struct iovec *v; 1861 int len; 1862 int error; 1863 SLIST_HEAD(, mntaarg) list; 1864 }; 1865 1866 /* 1867 * Add a boolean argument. 1868 * 1869 * flag is the boolean value. 1870 * name must start with "no". 1871 */ 1872 struct mntarg * 1873 mount_argb(struct mntarg *ma, int flag, const char *name) 1874 { 1875 1876 KASSERT(name[0] == 'n' && name[1] == 'o', 1877 ("mount_argb(...,%s): name must start with 'no'", name)); 1878 1879 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1880 } 1881 1882 /* 1883 * Add an argument printf style 1884 */ 1885 struct mntarg * 1886 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1887 { 1888 va_list ap; 1889 struct mntaarg *maa; 1890 struct sbuf *sb; 1891 int len; 1892 1893 if (ma == NULL) { 1894 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1895 SLIST_INIT(&ma->list); 1896 } 1897 if (ma->error) 1898 return (ma); 1899 1900 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1901 M_MOUNT, M_WAITOK); 1902 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1903 ma->v[ma->len].iov_len = strlen(name) + 1; 1904 ma->len++; 1905 1906 sb = sbuf_new_auto(); 1907 va_start(ap, fmt); 1908 sbuf_vprintf(sb, fmt, ap); 1909 va_end(ap); 1910 sbuf_finish(sb); 1911 len = sbuf_len(sb) + 1; 1912 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1913 SLIST_INSERT_HEAD(&ma->list, maa, next); 1914 bcopy(sbuf_data(sb), maa + 1, len); 1915 sbuf_delete(sb); 1916 1917 ma->v[ma->len].iov_base = maa + 1; 1918 ma->v[ma->len].iov_len = len; 1919 ma->len++; 1920 1921 return (ma); 1922 } 1923 1924 /* 1925 * Add an argument which is a userland string. 1926 */ 1927 struct mntarg * 1928 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1929 { 1930 struct mntaarg *maa; 1931 char *tbuf; 1932 1933 if (val == NULL) 1934 return (ma); 1935 if (ma == NULL) { 1936 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1937 SLIST_INIT(&ma->list); 1938 } 1939 if (ma->error) 1940 return (ma); 1941 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1942 SLIST_INSERT_HEAD(&ma->list, maa, next); 1943 tbuf = (void *)(maa + 1); 1944 ma->error = copyinstr(val, tbuf, len, NULL); 1945 return (mount_arg(ma, name, tbuf, -1)); 1946 } 1947 1948 /* 1949 * Plain argument. 1950 * 1951 * If length is -1, treat value as a C string. 1952 */ 1953 struct mntarg * 1954 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1955 { 1956 1957 if (ma == NULL) { 1958 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1959 SLIST_INIT(&ma->list); 1960 } 1961 if (ma->error) 1962 return (ma); 1963 1964 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1965 M_MOUNT, M_WAITOK); 1966 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1967 ma->v[ma->len].iov_len = strlen(name) + 1; 1968 ma->len++; 1969 1970 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1971 if (len < 0) 1972 ma->v[ma->len].iov_len = strlen(val) + 1; 1973 else 1974 ma->v[ma->len].iov_len = len; 1975 ma->len++; 1976 return (ma); 1977 } 1978 1979 /* 1980 * Free a mntarg structure 1981 */ 1982 static void 1983 free_mntarg(struct mntarg *ma) 1984 { 1985 struct mntaarg *maa; 1986 1987 while (!SLIST_EMPTY(&ma->list)) { 1988 maa = SLIST_FIRST(&ma->list); 1989 SLIST_REMOVE_HEAD(&ma->list, next); 1990 free(maa, M_MOUNT); 1991 } 1992 free(ma->v, M_MOUNT); 1993 free(ma, M_MOUNT); 1994 } 1995 1996 /* 1997 * Mount a filesystem 1998 */ 1999 int 2000 kernel_mount(struct mntarg *ma, uint64_t flags) 2001 { 2002 struct uio auio; 2003 int error; 2004 2005 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2006 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2007 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2008 2009 auio.uio_iov = ma->v; 2010 auio.uio_iovcnt = ma->len; 2011 auio.uio_segflg = UIO_SYSSPACE; 2012 2013 error = ma->error; 2014 if (!error) 2015 error = vfs_donmount(curthread, flags, &auio); 2016 free_mntarg(ma); 2017 return (error); 2018 } 2019 2020 /* 2021 * A printflike function to mount a filesystem. 2022 */ 2023 int 2024 kernel_vmount(int flags, ...) 2025 { 2026 struct mntarg *ma = NULL; 2027 va_list ap; 2028 const char *cp; 2029 const void *vp; 2030 int error; 2031 2032 va_start(ap, flags); 2033 for (;;) { 2034 cp = va_arg(ap, const char *); 2035 if (cp == NULL) 2036 break; 2037 vp = va_arg(ap, const void *); 2038 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2039 } 2040 va_end(ap); 2041 2042 error = kernel_mount(ma, flags); 2043 return (error); 2044 } 2045 2046 void 2047 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2048 { 2049 2050 bcopy(oexp, exp, sizeof(*oexp)); 2051 exp->ex_numsecflavors = 0; 2052 } 2053