1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1999-2004 Poul-Henning Kamp 5 * Copyright (c) 1999 Michael Smith 6 * Copyright (c) 1989, 1993 7 * The Regents of the University of California. All rights reserved. 8 * (c) UNIX System Laboratories, Inc. 9 * All or some portions of this file are derived from material licensed 10 * to the University of California by American Telephone and Telegraph 11 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 12 * the permission of UNIX System Laboratories, Inc. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/conf.h> 44 #include <sys/eventhandler.h> 45 #include <sys/fcntl.h> 46 #include <sys/jail.h> 47 #include <sys/kernel.h> 48 #include <sys/libkern.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mutex.h> 52 #include <sys/namei.h> 53 #include <sys/priv.h> 54 #include <sys/proc.h> 55 #include <sys/filedesc.h> 56 #include <sys/reboot.h> 57 #include <sys/sbuf.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysproto.h> 60 #include <sys/sx.h> 61 #include <sys/sysctl.h> 62 #include <sys/sysent.h> 63 #include <sys/systm.h> 64 #include <sys/vnode.h> 65 #include <vm/uma.h> 66 67 #include <geom/geom.h> 68 69 #include <machine/stdarg.h> 70 71 #include <security/audit/audit.h> 72 #include <security/mac/mac_framework.h> 73 74 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 75 76 static int vfs_domount(struct thread *td, const char *fstype, char *fspath, 77 uint64_t fsflags, struct vfsoptlist **optlist); 78 static void free_mntarg(struct mntarg *ma); 79 80 static int usermount = 0; 81 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 82 "Unprivileged users may mount and unmount file systems"); 83 84 static bool default_autoro = false; 85 SYSCTL_BOOL(_vfs, OID_AUTO, default_autoro, CTLFLAG_RW, &default_autoro, 0, 86 "Retry failed r/w mount as r/o if no explicit ro/rw option is specified"); 87 88 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 89 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure"); 90 static uma_zone_t mount_zone; 91 92 /* List of mounted filesystems. */ 93 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 94 95 /* For any iteration/modification of mountlist */ 96 struct mtx mountlist_mtx; 97 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 98 99 EVENTHANDLER_LIST_DEFINE(vfs_mounted); 100 EVENTHANDLER_LIST_DEFINE(vfs_unmounted); 101 102 /* 103 * Global opts, taken by all filesystems 104 */ 105 static const char *global_opts[] = { 106 "errmsg", 107 "fstype", 108 "fspath", 109 "ro", 110 "rw", 111 "nosuid", 112 "noexec", 113 NULL 114 }; 115 116 static int 117 mount_init(void *mem, int size, int flags) 118 { 119 struct mount *mp; 120 121 mp = (struct mount *)mem; 122 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 123 mtx_init(&mp->mnt_listmtx, "struct mount vlist mtx", NULL, MTX_DEF); 124 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 125 return (0); 126 } 127 128 static void 129 mount_fini(void *mem, int size) 130 { 131 struct mount *mp; 132 133 mp = (struct mount *)mem; 134 lockdestroy(&mp->mnt_explock); 135 mtx_destroy(&mp->mnt_listmtx); 136 mtx_destroy(&mp->mnt_mtx); 137 } 138 139 static void 140 vfs_mount_init(void *dummy __unused) 141 { 142 143 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL, 144 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 145 } 146 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL); 147 148 /* 149 * --------------------------------------------------------------------- 150 * Functions for building and sanitizing the mount options 151 */ 152 153 /* Remove one mount option. */ 154 static void 155 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 156 { 157 158 TAILQ_REMOVE(opts, opt, link); 159 free(opt->name, M_MOUNT); 160 if (opt->value != NULL) 161 free(opt->value, M_MOUNT); 162 free(opt, M_MOUNT); 163 } 164 165 /* Release all resources related to the mount options. */ 166 void 167 vfs_freeopts(struct vfsoptlist *opts) 168 { 169 struct vfsopt *opt; 170 171 while (!TAILQ_EMPTY(opts)) { 172 opt = TAILQ_FIRST(opts); 173 vfs_freeopt(opts, opt); 174 } 175 free(opts, M_MOUNT); 176 } 177 178 void 179 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 180 { 181 struct vfsopt *opt, *temp; 182 183 if (opts == NULL) 184 return; 185 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 186 if (strcmp(opt->name, name) == 0) 187 vfs_freeopt(opts, opt); 188 } 189 } 190 191 static int 192 vfs_isopt_ro(const char *opt) 193 { 194 195 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 || 196 strcmp(opt, "norw") == 0) 197 return (1); 198 return (0); 199 } 200 201 static int 202 vfs_isopt_rw(const char *opt) 203 { 204 205 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0) 206 return (1); 207 return (0); 208 } 209 210 /* 211 * Check if options are equal (with or without the "no" prefix). 212 */ 213 static int 214 vfs_equalopts(const char *opt1, const char *opt2) 215 { 216 char *p; 217 218 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 219 if (strcmp(opt1, opt2) == 0) 220 return (1); 221 /* "noopt" vs. "opt" */ 222 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 223 return (1); 224 /* "opt" vs. "noopt" */ 225 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 226 return (1); 227 while ((p = strchr(opt1, '.')) != NULL && 228 !strncmp(opt1, opt2, ++p - opt1)) { 229 opt2 += p - opt1; 230 opt1 = p; 231 /* "foo.noopt" vs. "foo.opt" */ 232 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 233 return (1); 234 /* "foo.opt" vs. "foo.noopt" */ 235 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 236 return (1); 237 } 238 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */ 239 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) && 240 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2))) 241 return (1); 242 return (0); 243 } 244 245 /* 246 * If a mount option is specified several times, 247 * (with or without the "no" prefix) only keep 248 * the last occurrence of it. 249 */ 250 static void 251 vfs_sanitizeopts(struct vfsoptlist *opts) 252 { 253 struct vfsopt *opt, *opt2, *tmp; 254 255 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 256 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 257 while (opt2 != NULL) { 258 if (vfs_equalopts(opt->name, opt2->name)) { 259 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 260 vfs_freeopt(opts, opt2); 261 opt2 = tmp; 262 } else { 263 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 264 } 265 } 266 } 267 } 268 269 /* 270 * Build a linked list of mount options from a struct uio. 271 */ 272 int 273 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 274 { 275 struct vfsoptlist *opts; 276 struct vfsopt *opt; 277 size_t memused, namelen, optlen; 278 unsigned int i, iovcnt; 279 int error; 280 281 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 282 TAILQ_INIT(opts); 283 memused = 0; 284 iovcnt = auio->uio_iovcnt; 285 for (i = 0; i < iovcnt; i += 2) { 286 namelen = auio->uio_iov[i].iov_len; 287 optlen = auio->uio_iov[i + 1].iov_len; 288 memused += sizeof(struct vfsopt) + optlen + namelen; 289 /* 290 * Avoid consuming too much memory, and attempts to overflow 291 * memused. 292 */ 293 if (memused > VFS_MOUNTARG_SIZE_MAX || 294 optlen > VFS_MOUNTARG_SIZE_MAX || 295 namelen > VFS_MOUNTARG_SIZE_MAX) { 296 error = EINVAL; 297 goto bad; 298 } 299 300 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 301 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 302 opt->value = NULL; 303 opt->len = 0; 304 opt->pos = i / 2; 305 opt->seen = 0; 306 307 /* 308 * Do this early, so jumps to "bad" will free the current 309 * option. 310 */ 311 TAILQ_INSERT_TAIL(opts, opt, link); 312 313 if (auio->uio_segflg == UIO_SYSSPACE) { 314 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 315 } else { 316 error = copyin(auio->uio_iov[i].iov_base, opt->name, 317 namelen); 318 if (error) 319 goto bad; 320 } 321 /* Ensure names are null-terminated strings. */ 322 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 323 error = EINVAL; 324 goto bad; 325 } 326 if (optlen != 0) { 327 opt->len = optlen; 328 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 329 if (auio->uio_segflg == UIO_SYSSPACE) { 330 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 331 optlen); 332 } else { 333 error = copyin(auio->uio_iov[i + 1].iov_base, 334 opt->value, optlen); 335 if (error) 336 goto bad; 337 } 338 } 339 } 340 vfs_sanitizeopts(opts); 341 *options = opts; 342 return (0); 343 bad: 344 vfs_freeopts(opts); 345 return (error); 346 } 347 348 /* 349 * Merge the old mount options with the new ones passed 350 * in the MNT_UPDATE case. 351 * 352 * XXX: This function will keep a "nofoo" option in the new 353 * options. E.g, if the option's canonical name is "foo", 354 * "nofoo" ends up in the mount point's active options. 355 */ 356 static void 357 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts) 358 { 359 struct vfsopt *opt, *new; 360 361 TAILQ_FOREACH(opt, oldopts, link) { 362 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 363 new->name = strdup(opt->name, M_MOUNT); 364 if (opt->len != 0) { 365 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 366 bcopy(opt->value, new->value, opt->len); 367 } else 368 new->value = NULL; 369 new->len = opt->len; 370 new->seen = opt->seen; 371 TAILQ_INSERT_HEAD(toopts, new, link); 372 } 373 vfs_sanitizeopts(toopts); 374 } 375 376 /* 377 * Mount a filesystem. 378 */ 379 #ifndef _SYS_SYSPROTO_H_ 380 struct nmount_args { 381 struct iovec *iovp; 382 unsigned int iovcnt; 383 int flags; 384 }; 385 #endif 386 int 387 sys_nmount(struct thread *td, struct nmount_args *uap) 388 { 389 struct uio *auio; 390 int error; 391 u_int iovcnt; 392 uint64_t flags; 393 394 /* 395 * Mount flags are now 64-bits. On 32-bit archtectures only 396 * 32-bits are passed in, but from here on everything handles 397 * 64-bit flags correctly. 398 */ 399 flags = uap->flags; 400 401 AUDIT_ARG_FFLAGS(flags); 402 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 403 uap->iovp, uap->iovcnt, flags); 404 405 /* 406 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 407 * userspace to set this flag, but we must filter it out if we want 408 * MNT_UPDATE on the root file system to work. 409 * MNT_ROOTFS should only be set by the kernel when mounting its 410 * root file system. 411 */ 412 flags &= ~MNT_ROOTFS; 413 414 iovcnt = uap->iovcnt; 415 /* 416 * Check that we have an even number of iovec's 417 * and that we have at least two options. 418 */ 419 if ((iovcnt & 1) || (iovcnt < 4)) { 420 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 421 uap->iovcnt); 422 return (EINVAL); 423 } 424 425 error = copyinuio(uap->iovp, iovcnt, &auio); 426 if (error) { 427 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 428 __func__, error); 429 return (error); 430 } 431 error = vfs_donmount(td, flags, auio); 432 433 free(auio, M_IOV); 434 return (error); 435 } 436 437 /* 438 * --------------------------------------------------------------------- 439 * Various utility functions 440 */ 441 442 void 443 vfs_ref(struct mount *mp) 444 { 445 446 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 447 MNT_ILOCK(mp); 448 MNT_REF(mp); 449 MNT_IUNLOCK(mp); 450 } 451 452 void 453 vfs_rel(struct mount *mp) 454 { 455 456 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 457 MNT_ILOCK(mp); 458 MNT_REL(mp); 459 MNT_IUNLOCK(mp); 460 } 461 462 /* 463 * Allocate and initialize the mount point struct. 464 */ 465 struct mount * 466 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 467 struct ucred *cred) 468 { 469 struct mount *mp; 470 471 mp = uma_zalloc(mount_zone, M_WAITOK); 472 bzero(&mp->mnt_startzero, 473 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 474 TAILQ_INIT(&mp->mnt_nvnodelist); 475 mp->mnt_nvnodelistsize = 0; 476 TAILQ_INIT(&mp->mnt_activevnodelist); 477 mp->mnt_activevnodelistsize = 0; 478 TAILQ_INIT(&mp->mnt_tmpfreevnodelist); 479 mp->mnt_tmpfreevnodelistsize = 0; 480 mp->mnt_ref = 0; 481 (void) vfs_busy(mp, MBF_NOWAIT); 482 atomic_add_acq_int(&vfsp->vfc_refcount, 1); 483 mp->mnt_op = vfsp->vfc_vfsops; 484 mp->mnt_vfc = vfsp; 485 mp->mnt_stat.f_type = vfsp->vfc_typenum; 486 mp->mnt_gen++; 487 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 488 mp->mnt_vnodecovered = vp; 489 mp->mnt_cred = crdup(cred); 490 mp->mnt_stat.f_owner = cred->cr_uid; 491 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 492 mp->mnt_iosize_max = DFLTPHYS; 493 #ifdef MAC 494 mac_mount_init(mp); 495 mac_mount_create(cred, mp); 496 #endif 497 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 498 TAILQ_INIT(&mp->mnt_uppers); 499 return (mp); 500 } 501 502 /* 503 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 504 */ 505 void 506 vfs_mount_destroy(struct mount *mp) 507 { 508 509 MNT_ILOCK(mp); 510 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 511 if (mp->mnt_kern_flag & MNTK_MWAIT) { 512 mp->mnt_kern_flag &= ~MNTK_MWAIT; 513 wakeup(mp); 514 } 515 while (mp->mnt_ref) 516 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 517 KASSERT(mp->mnt_ref == 0, 518 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 519 __FILE__, __LINE__)); 520 if (mp->mnt_writeopcount != 0) 521 panic("vfs_mount_destroy: nonzero writeopcount"); 522 if (mp->mnt_secondary_writes != 0) 523 panic("vfs_mount_destroy: nonzero secondary_writes"); 524 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1); 525 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 526 struct vnode *vp; 527 528 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 529 vn_printf(vp, "dangling vnode "); 530 panic("unmount: dangling vnode"); 531 } 532 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers")); 533 if (mp->mnt_nvnodelistsize != 0) 534 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 535 if (mp->mnt_activevnodelistsize != 0) 536 panic("vfs_mount_destroy: nonzero activevnodelistsize"); 537 if (mp->mnt_tmpfreevnodelistsize != 0) 538 panic("vfs_mount_destroy: nonzero tmpfreevnodelistsize"); 539 if (mp->mnt_lockref != 0) 540 panic("vfs_mount_destroy: nonzero lock refcount"); 541 MNT_IUNLOCK(mp); 542 if (mp->mnt_vnodecovered != NULL) 543 vrele(mp->mnt_vnodecovered); 544 #ifdef MAC 545 mac_mount_destroy(mp); 546 #endif 547 if (mp->mnt_opt != NULL) 548 vfs_freeopts(mp->mnt_opt); 549 crfree(mp->mnt_cred); 550 uma_zfree(mount_zone, mp); 551 } 552 553 static bool 554 vfs_should_downgrade_to_ro_mount(uint64_t fsflags, int error) 555 { 556 /* This is an upgrade of an exisiting mount. */ 557 if ((fsflags & MNT_UPDATE) != 0) 558 return (false); 559 /* This is already an R/O mount. */ 560 if ((fsflags & MNT_RDONLY) != 0) 561 return (false); 562 563 switch (error) { 564 case ENODEV: /* generic, geom, ... */ 565 case EACCES: /* cam/scsi, ... */ 566 case EROFS: /* md, mmcsd, ... */ 567 /* 568 * These errors can be returned by the storage layer to signal 569 * that the media is read-only. No harm in the R/O mount 570 * attempt if the error was returned for some other reason. 571 */ 572 return (true); 573 default: 574 return (false); 575 } 576 } 577 578 int 579 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions) 580 { 581 struct vfsoptlist *optlist; 582 struct vfsopt *opt, *tmp_opt; 583 char *fstype, *fspath, *errmsg; 584 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 585 bool autoro; 586 587 errmsg = fspath = NULL; 588 errmsg_len = fspathlen = 0; 589 errmsg_pos = -1; 590 autoro = default_autoro; 591 592 error = vfs_buildopts(fsoptions, &optlist); 593 if (error) 594 return (error); 595 596 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 597 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 598 599 /* 600 * We need these two options before the others, 601 * and they are mandatory for any filesystem. 602 * Ensure they are NUL terminated as well. 603 */ 604 fstypelen = 0; 605 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 606 if (error || fstype[fstypelen - 1] != '\0') { 607 error = EINVAL; 608 if (errmsg != NULL) 609 strncpy(errmsg, "Invalid fstype", errmsg_len); 610 goto bail; 611 } 612 fspathlen = 0; 613 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 614 if (error || fspath[fspathlen - 1] != '\0') { 615 error = EINVAL; 616 if (errmsg != NULL) 617 strncpy(errmsg, "Invalid fspath", errmsg_len); 618 goto bail; 619 } 620 621 /* 622 * We need to see if we have the "update" option 623 * before we call vfs_domount(), since vfs_domount() has special 624 * logic based on MNT_UPDATE. This is very important 625 * when we want to update the root filesystem. 626 */ 627 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 628 if (strcmp(opt->name, "update") == 0) { 629 fsflags |= MNT_UPDATE; 630 vfs_freeopt(optlist, opt); 631 } 632 else if (strcmp(opt->name, "async") == 0) 633 fsflags |= MNT_ASYNC; 634 else if (strcmp(opt->name, "force") == 0) { 635 fsflags |= MNT_FORCE; 636 vfs_freeopt(optlist, opt); 637 } 638 else if (strcmp(opt->name, "reload") == 0) { 639 fsflags |= MNT_RELOAD; 640 vfs_freeopt(optlist, opt); 641 } 642 else if (strcmp(opt->name, "multilabel") == 0) 643 fsflags |= MNT_MULTILABEL; 644 else if (strcmp(opt->name, "noasync") == 0) 645 fsflags &= ~MNT_ASYNC; 646 else if (strcmp(opt->name, "noatime") == 0) 647 fsflags |= MNT_NOATIME; 648 else if (strcmp(opt->name, "atime") == 0) { 649 free(opt->name, M_MOUNT); 650 opt->name = strdup("nonoatime", M_MOUNT); 651 } 652 else if (strcmp(opt->name, "noclusterr") == 0) 653 fsflags |= MNT_NOCLUSTERR; 654 else if (strcmp(opt->name, "clusterr") == 0) { 655 free(opt->name, M_MOUNT); 656 opt->name = strdup("nonoclusterr", M_MOUNT); 657 } 658 else if (strcmp(opt->name, "noclusterw") == 0) 659 fsflags |= MNT_NOCLUSTERW; 660 else if (strcmp(opt->name, "clusterw") == 0) { 661 free(opt->name, M_MOUNT); 662 opt->name = strdup("nonoclusterw", M_MOUNT); 663 } 664 else if (strcmp(opt->name, "noexec") == 0) 665 fsflags |= MNT_NOEXEC; 666 else if (strcmp(opt->name, "exec") == 0) { 667 free(opt->name, M_MOUNT); 668 opt->name = strdup("nonoexec", M_MOUNT); 669 } 670 else if (strcmp(opt->name, "nosuid") == 0) 671 fsflags |= MNT_NOSUID; 672 else if (strcmp(opt->name, "suid") == 0) { 673 free(opt->name, M_MOUNT); 674 opt->name = strdup("nonosuid", M_MOUNT); 675 } 676 else if (strcmp(opt->name, "nosymfollow") == 0) 677 fsflags |= MNT_NOSYMFOLLOW; 678 else if (strcmp(opt->name, "symfollow") == 0) { 679 free(opt->name, M_MOUNT); 680 opt->name = strdup("nonosymfollow", M_MOUNT); 681 } 682 else if (strcmp(opt->name, "noro") == 0) { 683 fsflags &= ~MNT_RDONLY; 684 autoro = false; 685 } 686 else if (strcmp(opt->name, "rw") == 0) { 687 fsflags &= ~MNT_RDONLY; 688 autoro = false; 689 } 690 else if (strcmp(opt->name, "ro") == 0) { 691 fsflags |= MNT_RDONLY; 692 autoro = false; 693 } 694 else if (strcmp(opt->name, "rdonly") == 0) { 695 free(opt->name, M_MOUNT); 696 opt->name = strdup("ro", M_MOUNT); 697 fsflags |= MNT_RDONLY; 698 autoro = false; 699 } 700 else if (strcmp(opt->name, "autoro") == 0) { 701 vfs_freeopt(optlist, opt); 702 autoro = true; 703 } 704 else if (strcmp(opt->name, "suiddir") == 0) 705 fsflags |= MNT_SUIDDIR; 706 else if (strcmp(opt->name, "sync") == 0) 707 fsflags |= MNT_SYNCHRONOUS; 708 else if (strcmp(opt->name, "union") == 0) 709 fsflags |= MNT_UNION; 710 else if (strcmp(opt->name, "automounted") == 0) { 711 fsflags |= MNT_AUTOMOUNTED; 712 vfs_freeopt(optlist, opt); 713 } 714 } 715 716 /* 717 * Be ultra-paranoid about making sure the type and fspath 718 * variables will fit in our mp buffers, including the 719 * terminating NUL. 720 */ 721 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) { 722 error = ENAMETOOLONG; 723 goto bail; 724 } 725 726 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 727 728 /* 729 * See if we can mount in the read-only mode if the error code suggests 730 * that it could be possible and the mount options allow for that. 731 * Never try it if "[no]{ro|rw}" has been explicitly requested and not 732 * overridden by "autoro". 733 */ 734 if (autoro && vfs_should_downgrade_to_ro_mount(fsflags, error)) { 735 printf("%s: R/W mount failed, possibly R/O media," 736 " trying R/O mount\n", __func__); 737 fsflags |= MNT_RDONLY; 738 error = vfs_domount(td, fstype, fspath, fsflags, &optlist); 739 } 740 bail: 741 /* copyout the errmsg */ 742 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 743 && errmsg_len > 0 && errmsg != NULL) { 744 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 745 bcopy(errmsg, 746 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 747 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 748 } else { 749 copyout(errmsg, 750 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 751 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 752 } 753 } 754 755 if (optlist != NULL) 756 vfs_freeopts(optlist); 757 return (error); 758 } 759 760 /* 761 * Old mount API. 762 */ 763 #ifndef _SYS_SYSPROTO_H_ 764 struct mount_args { 765 char *type; 766 char *path; 767 int flags; 768 caddr_t data; 769 }; 770 #endif 771 /* ARGSUSED */ 772 int 773 sys_mount(struct thread *td, struct mount_args *uap) 774 { 775 char *fstype; 776 struct vfsconf *vfsp = NULL; 777 struct mntarg *ma = NULL; 778 uint64_t flags; 779 int error; 780 781 /* 782 * Mount flags are now 64-bits. On 32-bit architectures only 783 * 32-bits are passed in, but from here on everything handles 784 * 64-bit flags correctly. 785 */ 786 flags = uap->flags; 787 788 AUDIT_ARG_FFLAGS(flags); 789 790 /* 791 * Filter out MNT_ROOTFS. We do not want clients of mount() in 792 * userspace to set this flag, but we must filter it out if we want 793 * MNT_UPDATE on the root file system to work. 794 * MNT_ROOTFS should only be set by the kernel when mounting its 795 * root file system. 796 */ 797 flags &= ~MNT_ROOTFS; 798 799 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 800 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 801 if (error) { 802 free(fstype, M_TEMP); 803 return (error); 804 } 805 806 AUDIT_ARG_TEXT(fstype); 807 vfsp = vfs_byname_kld(fstype, td, &error); 808 free(fstype, M_TEMP); 809 if (vfsp == NULL) 810 return (ENOENT); 811 if (((vfsp->vfc_flags & VFCF_SBDRY) != 0 && 812 vfsp->vfc_vfsops_sd->vfs_cmount == NULL) || 813 ((vfsp->vfc_flags & VFCF_SBDRY) == 0 && 814 vfsp->vfc_vfsops->vfs_cmount == NULL)) 815 return (EOPNOTSUPP); 816 817 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN); 818 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 819 ma = mount_argb(ma, flags & MNT_RDONLY, "noro"); 820 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid"); 821 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec"); 822 823 if ((vfsp->vfc_flags & VFCF_SBDRY) != 0) 824 return (vfsp->vfc_vfsops_sd->vfs_cmount(ma, uap->data, flags)); 825 return (vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags)); 826 } 827 828 /* 829 * vfs_domount_first(): first file system mount (not update) 830 */ 831 static int 832 vfs_domount_first( 833 struct thread *td, /* Calling thread. */ 834 struct vfsconf *vfsp, /* File system type. */ 835 char *fspath, /* Mount path. */ 836 struct vnode *vp, /* Vnode to be covered. */ 837 uint64_t fsflags, /* Flags common to all filesystems. */ 838 struct vfsoptlist **optlist /* Options local to the filesystem. */ 839 ) 840 { 841 struct vattr va; 842 struct mount *mp; 843 struct vnode *newdp; 844 int error, error1; 845 846 ASSERT_VOP_ELOCKED(vp, __func__); 847 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here")); 848 849 /* 850 * If the jail of the calling thread lacks permission for this type of 851 * file system, deny immediately. 852 */ 853 if (jailed(td->td_ucred) && !prison_allow(td->td_ucred, 854 vfsp->vfc_prison_flag)) { 855 vput(vp); 856 return (EPERM); 857 } 858 859 /* 860 * If the user is not root, ensure that they own the directory 861 * onto which we are attempting to mount. 862 */ 863 error = VOP_GETATTR(vp, &va, td->td_ucred); 864 if (error == 0 && va.va_uid != td->td_ucred->cr_uid) 865 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN); 866 if (error == 0) 867 error = vinvalbuf(vp, V_SAVE, 0, 0); 868 if (error == 0 && vp->v_type != VDIR) 869 error = ENOTDIR; 870 if (error == 0) { 871 VI_LOCK(vp); 872 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL) 873 vp->v_iflag |= VI_MOUNT; 874 else 875 error = EBUSY; 876 VI_UNLOCK(vp); 877 } 878 if (error != 0) { 879 vput(vp); 880 return (error); 881 } 882 VOP_UNLOCK(vp, 0); 883 884 /* Allocate and initialize the filesystem. */ 885 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 886 /* XXXMAC: pass to vfs_mount_alloc? */ 887 mp->mnt_optnew = *optlist; 888 /* Set the mount level flags. */ 889 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY)); 890 891 /* 892 * Mount the filesystem. 893 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 894 * get. No freeing of cn_pnbuf. 895 */ 896 error1 = 0; 897 if ((error = VFS_MOUNT(mp)) != 0 || 898 (error1 = VFS_STATFS(mp, &mp->mnt_stat)) != 0 || 899 (error1 = VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) != 0) { 900 if (error1 != 0) { 901 error = error1; 902 if ((error1 = VFS_UNMOUNT(mp, 0)) != 0) 903 printf("VFS_UNMOUNT returned %d\n", error1); 904 } 905 vfs_unbusy(mp); 906 mp->mnt_vnodecovered = NULL; 907 vfs_mount_destroy(mp); 908 VI_LOCK(vp); 909 vp->v_iflag &= ~VI_MOUNT; 910 VI_UNLOCK(vp); 911 vrele(vp); 912 return (error); 913 } 914 VOP_UNLOCK(newdp, 0); 915 916 if (mp->mnt_opt != NULL) 917 vfs_freeopts(mp->mnt_opt); 918 mp->mnt_opt = mp->mnt_optnew; 919 *optlist = NULL; 920 921 /* 922 * Prevent external consumers of mount options from reading mnt_optnew. 923 */ 924 mp->mnt_optnew = NULL; 925 926 MNT_ILOCK(mp); 927 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 928 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 929 mp->mnt_kern_flag |= MNTK_ASYNC; 930 else 931 mp->mnt_kern_flag &= ~MNTK_ASYNC; 932 MNT_IUNLOCK(mp); 933 934 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 935 cache_purge(vp); 936 VI_LOCK(vp); 937 vp->v_iflag &= ~VI_MOUNT; 938 VI_UNLOCK(vp); 939 vp->v_mountedhere = mp; 940 /* Place the new filesystem at the end of the mount list. */ 941 mtx_lock(&mountlist_mtx); 942 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 943 mtx_unlock(&mountlist_mtx); 944 vfs_event_signal(NULL, VQ_MOUNT, 0); 945 vn_lock(newdp, LK_EXCLUSIVE | LK_RETRY); 946 VOP_UNLOCK(vp, 0); 947 EVENTHANDLER_DIRECT_INVOKE(vfs_mounted, mp, newdp, td); 948 VOP_UNLOCK(newdp, 0); 949 mountcheckdirs(vp, newdp); 950 vrele(newdp); 951 if ((mp->mnt_flag & MNT_RDONLY) == 0) 952 vfs_allocate_syncvnode(mp); 953 vfs_unbusy(mp); 954 return (0); 955 } 956 957 /* 958 * vfs_domount_update(): update of mounted file system 959 */ 960 static int 961 vfs_domount_update( 962 struct thread *td, /* Calling thread. */ 963 struct vnode *vp, /* Mount point vnode. */ 964 uint64_t fsflags, /* Flags common to all filesystems. */ 965 struct vfsoptlist **optlist /* Options local to the filesystem. */ 966 ) 967 { 968 struct export_args export; 969 void *bufp; 970 struct mount *mp; 971 int error, export_error, len; 972 uint64_t flag; 973 974 ASSERT_VOP_ELOCKED(vp, __func__); 975 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here")); 976 mp = vp->v_mount; 977 978 if ((vp->v_vflag & VV_ROOT) == 0) { 979 if (vfs_copyopt(*optlist, "export", &export, sizeof(export)) 980 == 0) 981 error = EXDEV; 982 else 983 error = EINVAL; 984 vput(vp); 985 return (error); 986 } 987 988 /* 989 * We only allow the filesystem to be reloaded if it 990 * is currently mounted read-only. 991 */ 992 flag = mp->mnt_flag; 993 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) { 994 vput(vp); 995 return (EOPNOTSUPP); /* Needs translation */ 996 } 997 /* 998 * Only privileged root, or (if MNT_USER is set) the user that 999 * did the original mount is permitted to update it. 1000 */ 1001 error = vfs_suser(mp, td); 1002 if (error != 0) { 1003 vput(vp); 1004 return (error); 1005 } 1006 if (vfs_busy(mp, MBF_NOWAIT)) { 1007 vput(vp); 1008 return (EBUSY); 1009 } 1010 VI_LOCK(vp); 1011 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) { 1012 VI_UNLOCK(vp); 1013 vfs_unbusy(mp); 1014 vput(vp); 1015 return (EBUSY); 1016 } 1017 vp->v_iflag |= VI_MOUNT; 1018 VI_UNLOCK(vp); 1019 VOP_UNLOCK(vp, 0); 1020 1021 MNT_ILOCK(mp); 1022 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) { 1023 MNT_IUNLOCK(mp); 1024 error = EBUSY; 1025 goto end; 1026 } 1027 mp->mnt_flag &= ~MNT_UPDATEMASK; 1028 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | 1029 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY); 1030 if ((mp->mnt_flag & MNT_ASYNC) == 0) 1031 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1032 MNT_IUNLOCK(mp); 1033 mp->mnt_optnew = *optlist; 1034 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 1035 1036 /* 1037 * Mount the filesystem. 1038 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 1039 * get. No freeing of cn_pnbuf. 1040 */ 1041 error = VFS_MOUNT(mp); 1042 1043 export_error = 0; 1044 /* Process the export option. */ 1045 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp, 1046 &len) == 0) { 1047 /* Assume that there is only 1 ABI for each length. */ 1048 switch (len) { 1049 case (sizeof(struct oexport_args)): 1050 bzero(&export, sizeof(export)); 1051 /* FALLTHROUGH */ 1052 case (sizeof(export)): 1053 bcopy(bufp, &export, len); 1054 export_error = vfs_export(mp, &export); 1055 break; 1056 default: 1057 export_error = EINVAL; 1058 break; 1059 } 1060 } 1061 1062 MNT_ILOCK(mp); 1063 if (error == 0) { 1064 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE | 1065 MNT_SNAPSHOT); 1066 } else { 1067 /* 1068 * If we fail, restore old mount flags. MNT_QUOTA is special, 1069 * because it is not part of MNT_UPDATEMASK, but it could have 1070 * changed in the meantime if quotactl(2) was called. 1071 * All in all we want current value of MNT_QUOTA, not the old 1072 * one. 1073 */ 1074 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA); 1075 } 1076 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1077 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1078 mp->mnt_kern_flag |= MNTK_ASYNC; 1079 else 1080 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1081 MNT_IUNLOCK(mp); 1082 1083 if (error != 0) 1084 goto end; 1085 1086 if (mp->mnt_opt != NULL) 1087 vfs_freeopts(mp->mnt_opt); 1088 mp->mnt_opt = mp->mnt_optnew; 1089 *optlist = NULL; 1090 (void)VFS_STATFS(mp, &mp->mnt_stat); 1091 /* 1092 * Prevent external consumers of mount options from reading 1093 * mnt_optnew. 1094 */ 1095 mp->mnt_optnew = NULL; 1096 1097 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1098 vfs_allocate_syncvnode(mp); 1099 else 1100 vfs_deallocate_syncvnode(mp); 1101 end: 1102 vfs_unbusy(mp); 1103 VI_LOCK(vp); 1104 vp->v_iflag &= ~VI_MOUNT; 1105 VI_UNLOCK(vp); 1106 vrele(vp); 1107 return (error != 0 ? error : export_error); 1108 } 1109 1110 /* 1111 * vfs_domount(): actually attempt a filesystem mount. 1112 */ 1113 static int 1114 vfs_domount( 1115 struct thread *td, /* Calling thread. */ 1116 const char *fstype, /* Filesystem type. */ 1117 char *fspath, /* Mount path. */ 1118 uint64_t fsflags, /* Flags common to all filesystems. */ 1119 struct vfsoptlist **optlist /* Options local to the filesystem. */ 1120 ) 1121 { 1122 struct vfsconf *vfsp; 1123 struct nameidata nd; 1124 struct vnode *vp; 1125 char *pathbuf; 1126 int error; 1127 1128 /* 1129 * Be ultra-paranoid about making sure the type and fspath 1130 * variables will fit in our mp buffers, including the 1131 * terminating NUL. 1132 */ 1133 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 1134 return (ENAMETOOLONG); 1135 1136 if (jailed(td->td_ucred) || usermount == 0) { 1137 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 1138 return (error); 1139 } 1140 1141 /* 1142 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 1143 */ 1144 if (fsflags & MNT_EXPORTED) { 1145 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 1146 if (error) 1147 return (error); 1148 } 1149 if (fsflags & MNT_SUIDDIR) { 1150 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 1151 if (error) 1152 return (error); 1153 } 1154 /* 1155 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 1156 */ 1157 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 1158 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 1159 fsflags |= MNT_NOSUID | MNT_USER; 1160 } 1161 1162 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 1163 vfsp = NULL; 1164 if ((fsflags & MNT_UPDATE) == 0) { 1165 /* Don't try to load KLDs if we're mounting the root. */ 1166 if (fsflags & MNT_ROOTFS) 1167 vfsp = vfs_byname(fstype); 1168 else 1169 vfsp = vfs_byname_kld(fstype, td, &error); 1170 if (vfsp == NULL) 1171 return (ENODEV); 1172 } 1173 1174 /* 1175 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE. 1176 */ 1177 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1178 UIO_SYSSPACE, fspath, td); 1179 error = namei(&nd); 1180 if (error != 0) 1181 return (error); 1182 NDFREE(&nd, NDF_ONLY_PNBUF); 1183 vp = nd.ni_vp; 1184 if ((fsflags & MNT_UPDATE) == 0) { 1185 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1186 strcpy(pathbuf, fspath); 1187 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN); 1188 /* debug.disablefullpath == 1 results in ENODEV */ 1189 if (error == 0 || error == ENODEV) { 1190 error = vfs_domount_first(td, vfsp, pathbuf, vp, 1191 fsflags, optlist); 1192 } 1193 free(pathbuf, M_TEMP); 1194 } else 1195 error = vfs_domount_update(td, vp, fsflags, optlist); 1196 1197 return (error); 1198 } 1199 1200 /* 1201 * Unmount a filesystem. 1202 * 1203 * Note: unmount takes a path to the vnode mounted on as argument, not 1204 * special file (as before). 1205 */ 1206 #ifndef _SYS_SYSPROTO_H_ 1207 struct unmount_args { 1208 char *path; 1209 int flags; 1210 }; 1211 #endif 1212 /* ARGSUSED */ 1213 int 1214 sys_unmount(struct thread *td, struct unmount_args *uap) 1215 { 1216 struct nameidata nd; 1217 struct mount *mp; 1218 char *pathbuf; 1219 int error, id0, id1; 1220 1221 AUDIT_ARG_VALUE(uap->flags); 1222 if (jailed(td->td_ucred) || usermount == 0) { 1223 error = priv_check(td, PRIV_VFS_UNMOUNT); 1224 if (error) 1225 return (error); 1226 } 1227 1228 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1229 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1230 if (error) { 1231 free(pathbuf, M_TEMP); 1232 return (error); 1233 } 1234 if (uap->flags & MNT_BYFSID) { 1235 AUDIT_ARG_TEXT(pathbuf); 1236 /* Decode the filesystem ID. */ 1237 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1238 free(pathbuf, M_TEMP); 1239 return (EINVAL); 1240 } 1241 1242 mtx_lock(&mountlist_mtx); 1243 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1244 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1245 mp->mnt_stat.f_fsid.val[1] == id1) { 1246 vfs_ref(mp); 1247 break; 1248 } 1249 } 1250 mtx_unlock(&mountlist_mtx); 1251 } else { 1252 /* 1253 * Try to find global path for path argument. 1254 */ 1255 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, 1256 UIO_SYSSPACE, pathbuf, td); 1257 if (namei(&nd) == 0) { 1258 NDFREE(&nd, NDF_ONLY_PNBUF); 1259 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf, 1260 MNAMELEN); 1261 if (error == 0 || error == ENODEV) 1262 vput(nd.ni_vp); 1263 } 1264 mtx_lock(&mountlist_mtx); 1265 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1266 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) { 1267 vfs_ref(mp); 1268 break; 1269 } 1270 } 1271 mtx_unlock(&mountlist_mtx); 1272 } 1273 free(pathbuf, M_TEMP); 1274 if (mp == NULL) { 1275 /* 1276 * Previously we returned ENOENT for a nonexistent path and 1277 * EINVAL for a non-mountpoint. We cannot tell these apart 1278 * now, so in the !MNT_BYFSID case return the more likely 1279 * EINVAL for compatibility. 1280 */ 1281 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1282 } 1283 1284 /* 1285 * Don't allow unmounting the root filesystem. 1286 */ 1287 if (mp->mnt_flag & MNT_ROOTFS) { 1288 vfs_rel(mp); 1289 return (EINVAL); 1290 } 1291 error = dounmount(mp, uap->flags, td); 1292 return (error); 1293 } 1294 1295 /* 1296 * Return error if any of the vnodes, ignoring the root vnode 1297 * and the syncer vnode, have non-zero usecount. 1298 * 1299 * This function is purely advisory - it can return false positives 1300 * and negatives. 1301 */ 1302 static int 1303 vfs_check_usecounts(struct mount *mp) 1304 { 1305 struct vnode *vp, *mvp; 1306 1307 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 1308 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON && 1309 vp->v_usecount != 0) { 1310 VI_UNLOCK(vp); 1311 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 1312 return (EBUSY); 1313 } 1314 VI_UNLOCK(vp); 1315 } 1316 1317 return (0); 1318 } 1319 1320 static void 1321 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags) 1322 { 1323 1324 mtx_assert(MNT_MTX(mp), MA_OWNED); 1325 mp->mnt_kern_flag &= ~mntkflags; 1326 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) { 1327 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1328 wakeup(mp); 1329 } 1330 MNT_IUNLOCK(mp); 1331 if (coveredvp != NULL) { 1332 VOP_UNLOCK(coveredvp, 0); 1333 vdrop(coveredvp); 1334 } 1335 vn_finished_write(mp); 1336 } 1337 1338 /* 1339 * Do the actual filesystem unmount. 1340 */ 1341 int 1342 dounmount(struct mount *mp, int flags, struct thread *td) 1343 { 1344 struct vnode *coveredvp; 1345 int error; 1346 uint64_t async_flag; 1347 int mnt_gen_r; 1348 1349 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1350 mnt_gen_r = mp->mnt_gen; 1351 VI_LOCK(coveredvp); 1352 vholdl(coveredvp); 1353 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1354 /* 1355 * Check for mp being unmounted while waiting for the 1356 * covered vnode lock. 1357 */ 1358 if (coveredvp->v_mountedhere != mp || 1359 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1360 VOP_UNLOCK(coveredvp, 0); 1361 vdrop(coveredvp); 1362 vfs_rel(mp); 1363 return (EBUSY); 1364 } 1365 } 1366 1367 /* 1368 * Only privileged root, or (if MNT_USER is set) the user that did the 1369 * original mount is permitted to unmount this filesystem. 1370 */ 1371 error = vfs_suser(mp, td); 1372 if (error != 0) { 1373 if (coveredvp != NULL) { 1374 VOP_UNLOCK(coveredvp, 0); 1375 vdrop(coveredvp); 1376 } 1377 vfs_rel(mp); 1378 return (error); 1379 } 1380 1381 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF); 1382 MNT_ILOCK(mp); 1383 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 || 1384 (mp->mnt_flag & MNT_UPDATE) != 0 || 1385 !TAILQ_EMPTY(&mp->mnt_uppers)) { 1386 dounmount_cleanup(mp, coveredvp, 0); 1387 return (EBUSY); 1388 } 1389 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1390 if (flags & MNT_NONBUSY) { 1391 MNT_IUNLOCK(mp); 1392 error = vfs_check_usecounts(mp); 1393 MNT_ILOCK(mp); 1394 if (error != 0) { 1395 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT | 1396 MNTK_NOINSMNTQ); 1397 return (error); 1398 } 1399 } 1400 /* Allow filesystems to detect that a forced unmount is in progress. */ 1401 if (flags & MNT_FORCE) { 1402 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1403 MNT_IUNLOCK(mp); 1404 /* 1405 * Must be done after setting MNTK_UNMOUNTF and before 1406 * waiting for mnt_lockref to become 0. 1407 */ 1408 VFS_PURGE(mp); 1409 MNT_ILOCK(mp); 1410 } 1411 error = 0; 1412 if (mp->mnt_lockref) { 1413 mp->mnt_kern_flag |= MNTK_DRAINING; 1414 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1415 "mount drain", 0); 1416 } 1417 MNT_IUNLOCK(mp); 1418 KASSERT(mp->mnt_lockref == 0, 1419 ("%s: invalid lock refcount in the drain path @ %s:%d", 1420 __func__, __FILE__, __LINE__)); 1421 KASSERT(error == 0, 1422 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1423 __func__, __FILE__, __LINE__)); 1424 1425 if (mp->mnt_flag & MNT_EXPUBLIC) 1426 vfs_setpublicfs(NULL, NULL, NULL); 1427 1428 /* 1429 * From now, we can claim that the use reference on the 1430 * coveredvp is ours, and the ref can be released only by 1431 * successfull unmount by us, or left for later unmount 1432 * attempt. The previously acquired hold reference is no 1433 * longer needed to protect the vnode from reuse. 1434 */ 1435 if (coveredvp != NULL) 1436 vdrop(coveredvp); 1437 1438 vfs_msync(mp, MNT_WAIT); 1439 MNT_ILOCK(mp); 1440 async_flag = mp->mnt_flag & MNT_ASYNC; 1441 mp->mnt_flag &= ~MNT_ASYNC; 1442 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1443 MNT_IUNLOCK(mp); 1444 cache_purgevfs(mp, false); /* remove cache entries for this file sys */ 1445 vfs_deallocate_syncvnode(mp); 1446 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 || 1447 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) 1448 error = VFS_UNMOUNT(mp, flags); 1449 vn_finished_write(mp); 1450 /* 1451 * If we failed to flush the dirty blocks for this mount point, 1452 * undo all the cdir/rdir and rootvnode changes we made above. 1453 * Unless we failed to do so because the device is reporting that 1454 * it doesn't exist anymore. 1455 */ 1456 if (error && error != ENXIO) { 1457 MNT_ILOCK(mp); 1458 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1459 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1460 MNT_IUNLOCK(mp); 1461 vfs_allocate_syncvnode(mp); 1462 MNT_ILOCK(mp); 1463 } 1464 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1465 mp->mnt_flag |= async_flag; 1466 if ((mp->mnt_flag & MNT_ASYNC) != 0 && 1467 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0) 1468 mp->mnt_kern_flag |= MNTK_ASYNC; 1469 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1470 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1471 wakeup(mp); 1472 } 1473 MNT_IUNLOCK(mp); 1474 if (coveredvp) 1475 VOP_UNLOCK(coveredvp, 0); 1476 return (error); 1477 } 1478 mtx_lock(&mountlist_mtx); 1479 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1480 mtx_unlock(&mountlist_mtx); 1481 EVENTHANDLER_DIRECT_INVOKE(vfs_unmounted, mp, td); 1482 if (coveredvp != NULL) { 1483 coveredvp->v_mountedhere = NULL; 1484 VOP_UNLOCK(coveredvp, 0); 1485 } 1486 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1487 if (rootvnode != NULL && mp == rootvnode->v_mount) { 1488 vrele(rootvnode); 1489 rootvnode = NULL; 1490 } 1491 if (mp == rootdevmp) 1492 rootdevmp = NULL; 1493 vfs_mount_destroy(mp); 1494 return (0); 1495 } 1496 1497 /* 1498 * Report errors during filesystem mounting. 1499 */ 1500 void 1501 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1502 { 1503 struct vfsoptlist *moptlist = mp->mnt_optnew; 1504 va_list ap; 1505 int error, len; 1506 char *errmsg; 1507 1508 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1509 if (error || errmsg == NULL || len <= 0) 1510 return; 1511 1512 va_start(ap, fmt); 1513 vsnprintf(errmsg, (size_t)len, fmt, ap); 1514 va_end(ap); 1515 } 1516 1517 void 1518 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1519 { 1520 va_list ap; 1521 int error, len; 1522 char *errmsg; 1523 1524 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1525 if (error || errmsg == NULL || len <= 0) 1526 return; 1527 1528 va_start(ap, fmt); 1529 vsnprintf(errmsg, (size_t)len, fmt, ap); 1530 va_end(ap); 1531 } 1532 1533 /* 1534 * --------------------------------------------------------------------- 1535 * Functions for querying mount options/arguments from filesystems. 1536 */ 1537 1538 /* 1539 * Check that no unknown options are given 1540 */ 1541 int 1542 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1543 { 1544 struct vfsopt *opt; 1545 char errmsg[255]; 1546 const char **t, *p, *q; 1547 int ret = 0; 1548 1549 TAILQ_FOREACH(opt, opts, link) { 1550 p = opt->name; 1551 q = NULL; 1552 if (p[0] == 'n' && p[1] == 'o') 1553 q = p + 2; 1554 for(t = global_opts; *t != NULL; t++) { 1555 if (strcmp(*t, p) == 0) 1556 break; 1557 if (q != NULL) { 1558 if (strcmp(*t, q) == 0) 1559 break; 1560 } 1561 } 1562 if (*t != NULL) 1563 continue; 1564 for(t = legal; *t != NULL; t++) { 1565 if (strcmp(*t, p) == 0) 1566 break; 1567 if (q != NULL) { 1568 if (strcmp(*t, q) == 0) 1569 break; 1570 } 1571 } 1572 if (*t != NULL) 1573 continue; 1574 snprintf(errmsg, sizeof(errmsg), 1575 "mount option <%s> is unknown", p); 1576 ret = EINVAL; 1577 } 1578 if (ret != 0) { 1579 TAILQ_FOREACH(opt, opts, link) { 1580 if (strcmp(opt->name, "errmsg") == 0) { 1581 strncpy((char *)opt->value, errmsg, opt->len); 1582 break; 1583 } 1584 } 1585 if (opt == NULL) 1586 printf("%s\n", errmsg); 1587 } 1588 return (ret); 1589 } 1590 1591 /* 1592 * Get a mount option by its name. 1593 * 1594 * Return 0 if the option was found, ENOENT otherwise. 1595 * If len is non-NULL it will be filled with the length 1596 * of the option. If buf is non-NULL, it will be filled 1597 * with the address of the option. 1598 */ 1599 int 1600 vfs_getopt(struct vfsoptlist *opts, const char *name, void **buf, int *len) 1601 { 1602 struct vfsopt *opt; 1603 1604 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1605 1606 TAILQ_FOREACH(opt, opts, link) { 1607 if (strcmp(name, opt->name) == 0) { 1608 opt->seen = 1; 1609 if (len != NULL) 1610 *len = opt->len; 1611 if (buf != NULL) 1612 *buf = opt->value; 1613 return (0); 1614 } 1615 } 1616 return (ENOENT); 1617 } 1618 1619 int 1620 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1621 { 1622 struct vfsopt *opt; 1623 1624 if (opts == NULL) 1625 return (-1); 1626 1627 TAILQ_FOREACH(opt, opts, link) { 1628 if (strcmp(name, opt->name) == 0) { 1629 opt->seen = 1; 1630 return (opt->pos); 1631 } 1632 } 1633 return (-1); 1634 } 1635 1636 int 1637 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value) 1638 { 1639 char *opt_value, *vtp; 1640 quad_t iv; 1641 int error, opt_len; 1642 1643 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len); 1644 if (error != 0) 1645 return (error); 1646 if (opt_len == 0 || opt_value == NULL) 1647 return (EINVAL); 1648 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0') 1649 return (EINVAL); 1650 iv = strtoq(opt_value, &vtp, 0); 1651 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0')) 1652 return (EINVAL); 1653 if (iv < 0) 1654 return (EINVAL); 1655 switch (vtp[0]) { 1656 case 't': case 'T': 1657 iv *= 1024; 1658 /* FALLTHROUGH */ 1659 case 'g': case 'G': 1660 iv *= 1024; 1661 /* FALLTHROUGH */ 1662 case 'm': case 'M': 1663 iv *= 1024; 1664 /* FALLTHROUGH */ 1665 case 'k': case 'K': 1666 iv *= 1024; 1667 case '\0': 1668 break; 1669 default: 1670 return (EINVAL); 1671 } 1672 *value = iv; 1673 1674 return (0); 1675 } 1676 1677 char * 1678 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1679 { 1680 struct vfsopt *opt; 1681 1682 *error = 0; 1683 TAILQ_FOREACH(opt, opts, link) { 1684 if (strcmp(name, opt->name) != 0) 1685 continue; 1686 opt->seen = 1; 1687 if (opt->len == 0 || 1688 ((char *)opt->value)[opt->len - 1] != '\0') { 1689 *error = EINVAL; 1690 return (NULL); 1691 } 1692 return (opt->value); 1693 } 1694 *error = ENOENT; 1695 return (NULL); 1696 } 1697 1698 int 1699 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w, 1700 uint64_t val) 1701 { 1702 struct vfsopt *opt; 1703 1704 TAILQ_FOREACH(opt, opts, link) { 1705 if (strcmp(name, opt->name) == 0) { 1706 opt->seen = 1; 1707 if (w != NULL) 1708 *w |= val; 1709 return (1); 1710 } 1711 } 1712 if (w != NULL) 1713 *w &= ~val; 1714 return (0); 1715 } 1716 1717 int 1718 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1719 { 1720 va_list ap; 1721 struct vfsopt *opt; 1722 int ret; 1723 1724 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1725 1726 TAILQ_FOREACH(opt, opts, link) { 1727 if (strcmp(name, opt->name) != 0) 1728 continue; 1729 opt->seen = 1; 1730 if (opt->len == 0 || opt->value == NULL) 1731 return (0); 1732 if (((char *)opt->value)[opt->len - 1] != '\0') 1733 return (0); 1734 va_start(ap, fmt); 1735 ret = vsscanf(opt->value, fmt, ap); 1736 va_end(ap); 1737 return (ret); 1738 } 1739 return (0); 1740 } 1741 1742 int 1743 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 1744 { 1745 struct vfsopt *opt; 1746 1747 TAILQ_FOREACH(opt, opts, link) { 1748 if (strcmp(name, opt->name) != 0) 1749 continue; 1750 opt->seen = 1; 1751 if (opt->value == NULL) 1752 opt->len = len; 1753 else { 1754 if (opt->len != len) 1755 return (EINVAL); 1756 bcopy(value, opt->value, len); 1757 } 1758 return (0); 1759 } 1760 return (ENOENT); 1761 } 1762 1763 int 1764 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 1765 { 1766 struct vfsopt *opt; 1767 1768 TAILQ_FOREACH(opt, opts, link) { 1769 if (strcmp(name, opt->name) != 0) 1770 continue; 1771 opt->seen = 1; 1772 if (opt->value == NULL) 1773 opt->len = len; 1774 else { 1775 if (opt->len < len) 1776 return (EINVAL); 1777 opt->len = len; 1778 bcopy(value, opt->value, len); 1779 } 1780 return (0); 1781 } 1782 return (ENOENT); 1783 } 1784 1785 int 1786 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 1787 { 1788 struct vfsopt *opt; 1789 1790 TAILQ_FOREACH(opt, opts, link) { 1791 if (strcmp(name, opt->name) != 0) 1792 continue; 1793 opt->seen = 1; 1794 if (opt->value == NULL) 1795 opt->len = strlen(value) + 1; 1796 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 1797 return (EINVAL); 1798 return (0); 1799 } 1800 return (ENOENT); 1801 } 1802 1803 /* 1804 * Find and copy a mount option. 1805 * 1806 * The size of the buffer has to be specified 1807 * in len, if it is not the same length as the 1808 * mount option, EINVAL is returned. 1809 * Returns ENOENT if the option is not found. 1810 */ 1811 int 1812 vfs_copyopt(struct vfsoptlist *opts, const char *name, void *dest, int len) 1813 { 1814 struct vfsopt *opt; 1815 1816 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1817 1818 TAILQ_FOREACH(opt, opts, link) { 1819 if (strcmp(name, opt->name) == 0) { 1820 opt->seen = 1; 1821 if (len != opt->len) 1822 return (EINVAL); 1823 bcopy(opt->value, dest, opt->len); 1824 return (0); 1825 } 1826 } 1827 return (ENOENT); 1828 } 1829 1830 int 1831 __vfs_statfs(struct mount *mp, struct statfs *sbp) 1832 { 1833 int error; 1834 1835 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 1836 if (sbp != &mp->mnt_stat) 1837 *sbp = mp->mnt_stat; 1838 return (error); 1839 } 1840 1841 void 1842 vfs_mountedfrom(struct mount *mp, const char *from) 1843 { 1844 1845 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1846 strlcpy(mp->mnt_stat.f_mntfromname, from, 1847 sizeof mp->mnt_stat.f_mntfromname); 1848 } 1849 1850 /* 1851 * --------------------------------------------------------------------- 1852 * This is the api for building mount args and mounting filesystems from 1853 * inside the kernel. 1854 * 1855 * The API works by accumulation of individual args. First error is 1856 * latched. 1857 * 1858 * XXX: should be documented in new manpage kernel_mount(9) 1859 */ 1860 1861 /* A memory allocation which must be freed when we are done */ 1862 struct mntaarg { 1863 SLIST_ENTRY(mntaarg) next; 1864 }; 1865 1866 /* The header for the mount arguments */ 1867 struct mntarg { 1868 struct iovec *v; 1869 int len; 1870 int error; 1871 SLIST_HEAD(, mntaarg) list; 1872 }; 1873 1874 /* 1875 * Add a boolean argument. 1876 * 1877 * flag is the boolean value. 1878 * name must start with "no". 1879 */ 1880 struct mntarg * 1881 mount_argb(struct mntarg *ma, int flag, const char *name) 1882 { 1883 1884 KASSERT(name[0] == 'n' && name[1] == 'o', 1885 ("mount_argb(...,%s): name must start with 'no'", name)); 1886 1887 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1888 } 1889 1890 /* 1891 * Add an argument printf style 1892 */ 1893 struct mntarg * 1894 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1895 { 1896 va_list ap; 1897 struct mntaarg *maa; 1898 struct sbuf *sb; 1899 int len; 1900 1901 if (ma == NULL) { 1902 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1903 SLIST_INIT(&ma->list); 1904 } 1905 if (ma->error) 1906 return (ma); 1907 1908 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1909 M_MOUNT, M_WAITOK); 1910 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1911 ma->v[ma->len].iov_len = strlen(name) + 1; 1912 ma->len++; 1913 1914 sb = sbuf_new_auto(); 1915 va_start(ap, fmt); 1916 sbuf_vprintf(sb, fmt, ap); 1917 va_end(ap); 1918 sbuf_finish(sb); 1919 len = sbuf_len(sb) + 1; 1920 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1921 SLIST_INSERT_HEAD(&ma->list, maa, next); 1922 bcopy(sbuf_data(sb), maa + 1, len); 1923 sbuf_delete(sb); 1924 1925 ma->v[ma->len].iov_base = maa + 1; 1926 ma->v[ma->len].iov_len = len; 1927 ma->len++; 1928 1929 return (ma); 1930 } 1931 1932 /* 1933 * Add an argument which is a userland string. 1934 */ 1935 struct mntarg * 1936 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1937 { 1938 struct mntaarg *maa; 1939 char *tbuf; 1940 1941 if (val == NULL) 1942 return (ma); 1943 if (ma == NULL) { 1944 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1945 SLIST_INIT(&ma->list); 1946 } 1947 if (ma->error) 1948 return (ma); 1949 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1950 SLIST_INSERT_HEAD(&ma->list, maa, next); 1951 tbuf = (void *)(maa + 1); 1952 ma->error = copyinstr(val, tbuf, len, NULL); 1953 return (mount_arg(ma, name, tbuf, -1)); 1954 } 1955 1956 /* 1957 * Plain argument. 1958 * 1959 * If length is -1, treat value as a C string. 1960 */ 1961 struct mntarg * 1962 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1963 { 1964 1965 if (ma == NULL) { 1966 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1967 SLIST_INIT(&ma->list); 1968 } 1969 if (ma->error) 1970 return (ma); 1971 1972 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1973 M_MOUNT, M_WAITOK); 1974 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1975 ma->v[ma->len].iov_len = strlen(name) + 1; 1976 ma->len++; 1977 1978 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 1979 if (len < 0) 1980 ma->v[ma->len].iov_len = strlen(val) + 1; 1981 else 1982 ma->v[ma->len].iov_len = len; 1983 ma->len++; 1984 return (ma); 1985 } 1986 1987 /* 1988 * Free a mntarg structure 1989 */ 1990 static void 1991 free_mntarg(struct mntarg *ma) 1992 { 1993 struct mntaarg *maa; 1994 1995 while (!SLIST_EMPTY(&ma->list)) { 1996 maa = SLIST_FIRST(&ma->list); 1997 SLIST_REMOVE_HEAD(&ma->list, next); 1998 free(maa, M_MOUNT); 1999 } 2000 free(ma->v, M_MOUNT); 2001 free(ma, M_MOUNT); 2002 } 2003 2004 /* 2005 * Mount a filesystem 2006 */ 2007 int 2008 kernel_mount(struct mntarg *ma, uint64_t flags) 2009 { 2010 struct uio auio; 2011 int error; 2012 2013 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2014 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2015 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2016 2017 auio.uio_iov = ma->v; 2018 auio.uio_iovcnt = ma->len; 2019 auio.uio_segflg = UIO_SYSSPACE; 2020 2021 error = ma->error; 2022 if (!error) 2023 error = vfs_donmount(curthread, flags, &auio); 2024 free_mntarg(ma); 2025 return (error); 2026 } 2027 2028 /* 2029 * A printflike function to mount a filesystem. 2030 */ 2031 int 2032 kernel_vmount(int flags, ...) 2033 { 2034 struct mntarg *ma = NULL; 2035 va_list ap; 2036 const char *cp; 2037 const void *vp; 2038 int error; 2039 2040 va_start(ap, flags); 2041 for (;;) { 2042 cp = va_arg(ap, const char *); 2043 if (cp == NULL) 2044 break; 2045 vp = va_arg(ap, const void *); 2046 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2047 } 2048 va_end(ap); 2049 2050 error = kernel_mount(ma, flags); 2051 return (error); 2052 } 2053 2054 void 2055 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp) 2056 { 2057 2058 bcopy(oexp, exp, sizeof(*oexp)); 2059 exp->ex_numsecflavors = 0; 2060 } 2061