1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/clock.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/filedesc.h> 53 #include <sys/reboot.h> 54 #include <sys/syscallsubr.h> 55 #include <sys/sysproto.h> 56 #include <sys/sx.h> 57 #include <sys/sysctl.h> 58 #include <sys/sysent.h> 59 #include <sys/systm.h> 60 #include <sys/vnode.h> 61 #include <vm/uma.h> 62 63 #include <geom/geom.h> 64 65 #include <machine/stdarg.h> 66 67 #include <security/audit/audit.h> 68 #include <security/mac/mac_framework.h> 69 70 #include "opt_rootdevname.h" 71 #include "opt_ddb.h" 72 #include "opt_mac.h" 73 74 #ifdef DDB 75 #include <ddb/ddb.h> 76 #endif 77 78 #define ROOTNAME "root_device" 79 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 80 81 static int vfs_domount(struct thread *td, const char *fstype, 82 char *fspath, int fsflags, void *fsdata); 83 static struct mount *vfs_mount_alloc(struct vnode *dvp, struct vfsconf *vfsp, 84 const char *fspath, struct thread *td); 85 static int vfs_mountroot_ask(void); 86 static int vfs_mountroot_try(const char *mountfrom); 87 static int vfs_donmount(struct thread *td, int fsflags, 88 struct uio *fsoptions); 89 static void free_mntarg(struct mntarg *ma); 90 static void vfs_mount_destroy(struct mount *); 91 static int vfs_getopt_pos(struct vfsoptlist *opts, const char *name); 92 93 static int usermount = 0; 94 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 95 "Unprivileged users may mount and unmount file systems"); 96 97 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 98 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 99 static uma_zone_t mount_zone; 100 101 /* List of mounted filesystems. */ 102 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 103 104 /* For any iteration/modification of mountlist */ 105 struct mtx mountlist_mtx; 106 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 107 108 TAILQ_HEAD(vfsoptlist, vfsopt); 109 struct vfsopt { 110 TAILQ_ENTRY(vfsopt) link; 111 char *name; 112 void *value; 113 int len; 114 }; 115 116 /* 117 * The vnode of the system's root (/ in the filesystem, without chroot 118 * active.) 119 */ 120 struct vnode *rootvnode; 121 122 /* 123 * The root filesystem is detailed in the kernel environment variable 124 * vfs.root.mountfrom, which is expected to be in the general format 125 * 126 * <vfsname>:[<path>] 127 * vfsname := the name of a VFS known to the kernel and capable 128 * of being mounted as root 129 * path := disk device name or other data used by the filesystem 130 * to locate its physical store 131 */ 132 133 /* 134 * Global opts, taken by all filesystems 135 */ 136 static const char *global_opts[] = { 137 "errmsg", 138 "fstype", 139 "fspath", 140 "rdonly", 141 "ro", 142 "rw", 143 "suid", 144 "exec", 145 "update", 146 NULL 147 }; 148 149 /* 150 * The root specifiers we will try if RB_CDROM is specified. 151 */ 152 static char *cdrom_rootdevnames[] = { 153 "cd9660:cd0", 154 "cd9660:acd0", 155 NULL 156 }; 157 158 /* legacy find-root code */ 159 char *rootdevnames[2] = {NULL, NULL}; 160 #ifndef ROOTDEVNAME 161 # define ROOTDEVNAME NULL 162 #endif 163 static const char *ctrootdevname = ROOTDEVNAME; 164 165 /* 166 * --------------------------------------------------------------------- 167 * Functions for building and sanitizing the mount options 168 */ 169 170 /* Remove one mount option. */ 171 static void 172 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 173 { 174 175 TAILQ_REMOVE(opts, opt, link); 176 free(opt->name, M_MOUNT); 177 if (opt->value != NULL) 178 free(opt->value, M_MOUNT); 179 #ifdef INVARIANTS 180 else if (opt->len != 0) 181 panic("%s: mount option with NULL value but length != 0", 182 __func__); 183 #endif 184 free(opt, M_MOUNT); 185 } 186 187 /* Release all resources related to the mount options. */ 188 static void 189 vfs_freeopts(struct vfsoptlist *opts) 190 { 191 struct vfsopt *opt; 192 193 while (!TAILQ_EMPTY(opts)) { 194 opt = TAILQ_FIRST(opts); 195 vfs_freeopt(opts, opt); 196 } 197 free(opts, M_MOUNT); 198 } 199 200 void 201 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 202 { 203 struct vfsopt *opt, *temp; 204 205 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 206 if (strcmp(opt->name, name) == 0) 207 vfs_freeopt(opts, opt); 208 } 209 } 210 211 /* 212 * Check if options are equal (with or without the "no" prefix). 213 */ 214 static int 215 vfs_equalopts(const char *opt1, const char *opt2) 216 { 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 return (0); 228 } 229 230 /* 231 * If a mount option is specified several times, 232 * (with or without the "no" prefix) only keep 233 * the last occurence of it. 234 */ 235 static void 236 vfs_sanitizeopts(struct vfsoptlist *opts) 237 { 238 struct vfsopt *opt, *opt2, *tmp; 239 240 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 241 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 242 while (opt2 != NULL) { 243 if (vfs_equalopts(opt->name, opt2->name)) { 244 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 245 vfs_freeopt(opts, opt2); 246 opt2 = tmp; 247 } else { 248 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 249 } 250 } 251 } 252 } 253 254 /* 255 * Build a linked list of mount options from a struct uio. 256 */ 257 static int 258 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 259 { 260 struct vfsoptlist *opts; 261 struct vfsopt *opt; 262 size_t memused; 263 unsigned int i, iovcnt; 264 int error, namelen, optlen; 265 266 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 267 TAILQ_INIT(opts); 268 memused = 0; 269 iovcnt = auio->uio_iovcnt; 270 for (i = 0; i < iovcnt; i += 2) { 271 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 272 namelen = auio->uio_iov[i].iov_len; 273 optlen = auio->uio_iov[i + 1].iov_len; 274 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 275 opt->value = NULL; 276 opt->len = 0; 277 278 /* 279 * Do this early, so jumps to "bad" will free the current 280 * option. 281 */ 282 TAILQ_INSERT_TAIL(opts, opt, link); 283 memused += sizeof(struct vfsopt) + optlen + namelen; 284 285 /* 286 * Avoid consuming too much memory, and attempts to overflow 287 * memused. 288 */ 289 if (memused > VFS_MOUNTARG_SIZE_MAX || 290 optlen > VFS_MOUNTARG_SIZE_MAX || 291 namelen > VFS_MOUNTARG_SIZE_MAX) { 292 error = EINVAL; 293 goto bad; 294 } 295 296 if (auio->uio_segflg == UIO_SYSSPACE) { 297 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 298 } else { 299 error = copyin(auio->uio_iov[i].iov_base, opt->name, 300 namelen); 301 if (error) 302 goto bad; 303 } 304 /* Ensure names are null-terminated strings. */ 305 if (opt->name[namelen - 1] != '\0') { 306 error = EINVAL; 307 goto bad; 308 } 309 if (optlen != 0) { 310 opt->len = optlen; 311 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 312 if (auio->uio_segflg == UIO_SYSSPACE) { 313 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 314 optlen); 315 } else { 316 error = copyin(auio->uio_iov[i + 1].iov_base, 317 opt->value, optlen); 318 if (error) 319 goto bad; 320 } 321 } 322 } 323 vfs_sanitizeopts(opts); 324 *options = opts; 325 return (0); 326 bad: 327 vfs_freeopts(opts); 328 return (error); 329 } 330 331 /* 332 * Merge the old mount options with the new ones passed 333 * in the MNT_UPDATE case. 334 */ 335 static void 336 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 337 { 338 struct vfsopt *opt, *opt2, *new; 339 340 TAILQ_FOREACH(opt, opts, link) { 341 /* 342 * Check that this option hasn't been redefined 343 * nor cancelled with a "no" mount option. 344 */ 345 opt2 = TAILQ_FIRST(toopts); 346 while (opt2 != NULL) { 347 if (strcmp(opt2->name, opt->name) == 0) 348 goto next; 349 if (strncmp(opt2->name, "no", 2) == 0 && 350 strcmp(opt2->name + 2, opt->name) == 0) { 351 vfs_freeopt(toopts, opt2); 352 goto next; 353 } 354 opt2 = TAILQ_NEXT(opt2, link); 355 } 356 /* We want this option, duplicate it. */ 357 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 358 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 359 strcpy(new->name, opt->name); 360 if (opt->len != 0) { 361 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 362 bcopy(opt->value, new->value, opt->len); 363 } else { 364 new->value = NULL; 365 } 366 new->len = opt->len; 367 TAILQ_INSERT_TAIL(toopts, new, link); 368 next: 369 continue; 370 } 371 } 372 373 /* 374 * Mount a filesystem. 375 */ 376 int 377 nmount(td, uap) 378 struct thread *td; 379 struct nmount_args /* { 380 struct iovec *iovp; 381 unsigned int iovcnt; 382 int flags; 383 } */ *uap; 384 { 385 struct uio *auio; 386 struct iovec *iov; 387 unsigned int i; 388 int error; 389 u_int iovcnt; 390 391 AUDIT_ARG(fflags, uap->flags); 392 393 /* Kick out MNT_ROOTFS early as it is legal internally */ 394 if (uap->flags & MNT_ROOTFS) 395 return (EINVAL); 396 397 iovcnt = uap->iovcnt; 398 /* 399 * Check that we have an even number of iovec's 400 * and that we have at least two options. 401 */ 402 if ((iovcnt & 1) || (iovcnt < 4)) 403 return (EINVAL); 404 405 error = copyinuio(uap->iovp, iovcnt, &auio); 406 if (error) 407 return (error); 408 iov = auio->uio_iov; 409 for (i = 0; i < iovcnt; i++) { 410 if (iov->iov_len > MMAXOPTIONLEN) { 411 free(auio, M_IOV); 412 return (EINVAL); 413 } 414 iov++; 415 } 416 error = vfs_donmount(td, uap->flags, auio); 417 418 free(auio, M_IOV); 419 return (error); 420 } 421 422 /* 423 * --------------------------------------------------------------------- 424 * Various utility functions 425 */ 426 427 void 428 vfs_ref(struct mount *mp) 429 { 430 431 MNT_ILOCK(mp); 432 MNT_REF(mp); 433 MNT_IUNLOCK(mp); 434 } 435 436 void 437 vfs_rel(struct mount *mp) 438 { 439 440 MNT_ILOCK(mp); 441 MNT_REL(mp); 442 MNT_IUNLOCK(mp); 443 } 444 445 static int 446 mount_init(void *mem, int size, int flags) 447 { 448 struct mount *mp; 449 450 mp = (struct mount *)mem; 451 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 452 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 453 return (0); 454 } 455 456 static void 457 mount_fini(void *mem, int size) 458 { 459 struct mount *mp; 460 461 mp = (struct mount *)mem; 462 lockdestroy(&mp->mnt_lock); 463 mtx_destroy(&mp->mnt_mtx); 464 } 465 466 /* 467 * Allocate and initialize the mount point struct. 468 */ 469 static struct mount * 470 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, 471 const char *fspath, struct thread *td) 472 { 473 struct mount *mp; 474 475 mp = uma_zalloc(mount_zone, M_WAITOK); 476 bzero(&mp->mnt_startzero, 477 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 478 TAILQ_INIT(&mp->mnt_nvnodelist); 479 mp->mnt_nvnodelistsize = 0; 480 mp->mnt_ref = 0; 481 (void) vfs_busy(mp, LK_NOWAIT, 0, td); 482 mp->mnt_op = vfsp->vfc_vfsops; 483 mp->mnt_vfc = vfsp; 484 vfsp->vfc_refcount++; /* XXX Unlocked */ 485 mp->mnt_stat.f_type = vfsp->vfc_typenum; 486 MNT_ILOCK(mp); 487 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 488 MNT_IUNLOCK(mp); 489 mp->mnt_gen++; 490 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 491 mp->mnt_vnodecovered = vp; 492 mp->mnt_cred = crdup(td->td_ucred); 493 mp->mnt_stat.f_owner = td->td_ucred->cr_uid; 494 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 495 mp->mnt_iosize_max = DFLTPHYS; 496 #ifdef MAC 497 mac_init_mount(mp); 498 mac_create_mount(td->td_ucred, mp); 499 #endif 500 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 501 return (mp); 502 } 503 504 /* 505 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 506 */ 507 static void 508 vfs_mount_destroy(struct mount *mp) 509 { 510 int i; 511 512 MNT_ILOCK(mp); 513 for (i = 0; mp->mnt_ref && i < 3; i++) 514 msleep(mp, MNT_MTX(mp), PVFS, "mntref", hz); 515 /* 516 * This will always cause a 3 second delay in rebooting due to 517 * refs on the root mountpoint that never go away. Most of these 518 * are held by init which never exits. 519 */ 520 if (i == 3 && (!rebooting || bootverbose)) 521 printf("Mount point %s had %d dangling refs\n", 522 mp->mnt_stat.f_mntonname, mp->mnt_ref); 523 if (mp->mnt_holdcnt != 0) { 524 printf("Waiting for mount point to be unheld\n"); 525 while (mp->mnt_holdcnt != 0) { 526 mp->mnt_holdcntwaiters++; 527 msleep(&mp->mnt_holdcnt, MNT_MTX(mp), 528 PZERO, "mntdestroy", 0); 529 mp->mnt_holdcntwaiters--; 530 } 531 printf("mount point unheld\n"); 532 } 533 if (mp->mnt_writeopcount > 0) { 534 printf("Waiting for mount point write ops\n"); 535 while (mp->mnt_writeopcount > 0) { 536 mp->mnt_kern_flag |= MNTK_SUSPEND; 537 msleep(&mp->mnt_writeopcount, 538 MNT_MTX(mp), 539 PZERO, "mntdestroy2", 0); 540 } 541 printf("mount point write ops completed\n"); 542 } 543 if (mp->mnt_secondary_writes > 0) { 544 printf("Waiting for mount point secondary write ops\n"); 545 while (mp->mnt_secondary_writes > 0) { 546 mp->mnt_kern_flag |= MNTK_SUSPEND; 547 msleep(&mp->mnt_secondary_writes, 548 MNT_MTX(mp), 549 PZERO, "mntdestroy3", 0); 550 } 551 printf("mount point secondary write ops completed\n"); 552 } 553 MNT_IUNLOCK(mp); 554 mp->mnt_vfc->vfc_refcount--; 555 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 556 struct vnode *vp; 557 558 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 559 vprint("", vp); 560 panic("unmount: dangling vnode"); 561 } 562 MNT_ILOCK(mp); 563 if (mp->mnt_kern_flag & MNTK_MWAIT) 564 wakeup(mp); 565 if (mp->mnt_writeopcount != 0) 566 panic("vfs_mount_destroy: nonzero writeopcount"); 567 if (mp->mnt_secondary_writes != 0) 568 panic("vfs_mount_destroy: nonzero secondary_writes"); 569 if (mp->mnt_nvnodelistsize != 0) 570 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 571 mp->mnt_writeopcount = -1000; 572 mp->mnt_nvnodelistsize = -1000; 573 mp->mnt_secondary_writes = -1000; 574 MNT_IUNLOCK(mp); 575 #ifdef MAC 576 mac_destroy_mount(mp); 577 #endif 578 if (mp->mnt_opt != NULL) 579 vfs_freeopts(mp->mnt_opt); 580 crfree(mp->mnt_cred); 581 uma_zfree(mount_zone, mp); 582 } 583 584 static int 585 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 586 { 587 struct vfsoptlist *optlist; 588 struct vfsopt *opt, *noro_opt; 589 char *fstype, *fspath, *errmsg; 590 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 591 int has_rw, has_noro; 592 593 errmsg = NULL; 594 errmsg_len = 0; 595 errmsg_pos = -1; 596 has_rw = 0; 597 has_noro = 0; 598 599 error = vfs_buildopts(fsoptions, &optlist); 600 if (error) 601 return (error); 602 603 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 604 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 605 606 /* 607 * We need these two options before the others, 608 * and they are mandatory for any filesystem. 609 * Ensure they are NUL terminated as well. 610 */ 611 fstypelen = 0; 612 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 613 if (error || fstype[fstypelen - 1] != '\0') { 614 error = EINVAL; 615 if (errmsg != NULL) 616 strncpy(errmsg, "Invalid fstype", errmsg_len); 617 goto bail; 618 } 619 fspathlen = 0; 620 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 621 if (error || fspath[fspathlen - 1] != '\0') { 622 error = EINVAL; 623 if (errmsg != NULL) 624 strncpy(errmsg, "Invalid fspath", errmsg_len); 625 goto bail; 626 } 627 628 /* 629 * We need to see if we have the "update" option 630 * before we call vfs_domount(), since vfs_domount() has special 631 * logic based on MNT_UPDATE. This is very important 632 * when we want to update the root filesystem. 633 */ 634 TAILQ_FOREACH(opt, optlist, link) { 635 if (strcmp(opt->name, "update") == 0) 636 fsflags |= MNT_UPDATE; 637 else if (strcmp(opt->name, "async") == 0) 638 fsflags |= MNT_ASYNC; 639 else if (strcmp(opt->name, "force") == 0) 640 fsflags |= MNT_FORCE; 641 else if (strcmp(opt->name, "multilabel") == 0) 642 fsflags |= MNT_MULTILABEL; 643 else if (strcmp(opt->name, "noasync") == 0) 644 fsflags &= ~MNT_ASYNC; 645 else if (strcmp(opt->name, "noatime") == 0) 646 fsflags |= MNT_NOATIME; 647 else if (strcmp(opt->name, "noclusterr") == 0) 648 fsflags |= MNT_NOCLUSTERR; 649 else if (strcmp(opt->name, "noclusterw") == 0) 650 fsflags |= MNT_NOCLUSTERW; 651 else if (strcmp(opt->name, "noexec") == 0) 652 fsflags |= MNT_NOEXEC; 653 else if (strcmp(opt->name, "nosuid") == 0) 654 fsflags |= MNT_NOSUID; 655 else if (strcmp(opt->name, "nosymfollow") == 0) 656 fsflags |= MNT_NOSYMFOLLOW; 657 else if (strcmp(opt->name, "noro") == 0) { 658 fsflags &= ~MNT_RDONLY; 659 has_noro = 1; 660 } 661 else if (strcmp(opt->name, "rw") == 0) { 662 fsflags &= ~MNT_RDONLY; 663 has_rw = 1; 664 } 665 else if (strcmp(opt->name, "ro") == 0 || 666 strcmp(opt->name, "rdonly") == 0) 667 fsflags |= MNT_RDONLY; 668 else if (strcmp(opt->name, "snapshot") == 0) 669 fsflags |= MNT_SNAPSHOT; 670 else if (strcmp(opt->name, "suiddir") == 0) 671 fsflags |= MNT_SUIDDIR; 672 else if (strcmp(opt->name, "sync") == 0) 673 fsflags |= MNT_SYNCHRONOUS; 674 else if (strcmp(opt->name, "union") == 0) 675 fsflags |= MNT_UNION; 676 } 677 678 /* 679 * If "rw" was specified as a mount option, and we 680 * are trying to update a mount-point from "ro" to "rw", 681 * we need a mount option "noro", since in vfs_mergeopts(), 682 * "noro" will cancel "ro", but "rw" will not do anything. 683 */ 684 if (has_rw && !has_noro) { 685 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 686 noro_opt->name = strdup("noro", M_MOUNT); 687 noro_opt->value = NULL; 688 noro_opt->len = 0; 689 TAILQ_INSERT_TAIL(optlist, noro_opt, link); 690 } 691 692 /* 693 * Be ultra-paranoid about making sure the type and fspath 694 * variables will fit in our mp buffers, including the 695 * terminating NUL. 696 */ 697 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 698 error = ENAMETOOLONG; 699 goto bail; 700 } 701 702 mtx_lock(&Giant); 703 error = vfs_domount(td, fstype, fspath, fsflags, optlist); 704 mtx_unlock(&Giant); 705 bail: 706 /* copyout the errmsg */ 707 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 708 && errmsg_len > 0 && errmsg != NULL) { 709 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 710 bcopy(errmsg, 711 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 712 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 713 } else { 714 copyout(errmsg, 715 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 716 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 717 } 718 } 719 720 if (error != 0) 721 vfs_freeopts(optlist); 722 return (error); 723 } 724 725 /* 726 * Old mount API. 727 */ 728 #ifndef _SYS_SYSPROTO_H_ 729 struct mount_args { 730 char *type; 731 char *path; 732 int flags; 733 caddr_t data; 734 }; 735 #endif 736 /* ARGSUSED */ 737 int 738 mount(td, uap) 739 struct thread *td; 740 struct mount_args /* { 741 char *type; 742 char *path; 743 int flags; 744 caddr_t data; 745 } */ *uap; 746 { 747 char *fstype; 748 struct vfsconf *vfsp = NULL; 749 struct mntarg *ma = NULL; 750 int error; 751 752 AUDIT_ARG(fflags, uap->flags); 753 754 /* Kick out MNT_ROOTFS early as it is legal internally */ 755 uap->flags &= ~MNT_ROOTFS; 756 757 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 758 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 759 if (error) { 760 free(fstype, M_TEMP); 761 return (error); 762 } 763 764 AUDIT_ARG(text, fstype); 765 mtx_lock(&Giant); 766 vfsp = vfs_byname_kld(fstype, td, &error); 767 free(fstype, M_TEMP); 768 if (vfsp == NULL) { 769 mtx_unlock(&Giant); 770 return (ENOENT); 771 } 772 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 773 mtx_unlock(&Giant); 774 return (EOPNOTSUPP); 775 } 776 777 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 778 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 779 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 780 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 781 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 782 783 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td); 784 mtx_unlock(&Giant); 785 return (error); 786 } 787 788 789 /* 790 * vfs_domount(): actually attempt a filesystem mount. 791 */ 792 static int 793 vfs_domount( 794 struct thread *td, /* Calling thread. */ 795 const char *fstype, /* Filesystem type. */ 796 char *fspath, /* Mount path. */ 797 int fsflags, /* Flags common to all filesystems. */ 798 void *fsdata /* Options local to the filesystem. */ 799 ) 800 { 801 struct vnode *vp; 802 struct mount *mp; 803 struct vfsconf *vfsp; 804 struct export_args export; 805 int error, flag = 0; 806 struct vattr va; 807 struct nameidata nd; 808 809 mtx_assert(&Giant, MA_OWNED); 810 /* 811 * Be ultra-paranoid about making sure the type and fspath 812 * variables will fit in our mp buffers, including the 813 * terminating NUL. 814 */ 815 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 816 return (ENAMETOOLONG); 817 818 if (jailed(td->td_ucred) || usermount == 0) { 819 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 820 return (error); 821 } 822 823 /* 824 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 825 */ 826 if (fsflags & MNT_EXPORTED) { 827 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 828 if (error) 829 return (error); 830 } 831 if (fsflags & MNT_SUIDDIR) { 832 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 833 if (error) 834 return (error); 835 } 836 /* 837 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 838 */ 839 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 840 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 841 fsflags |= MNT_NOSUID | MNT_USER; 842 } 843 844 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 845 vfsp = NULL; 846 if ((fsflags & MNT_UPDATE) == 0) { 847 /* Don't try to load KLDs if we're mounting the root. */ 848 if (fsflags & MNT_ROOTFS) 849 vfsp = vfs_byname(fstype); 850 else 851 vfsp = vfs_byname_kld(fstype, td, &error); 852 if (vfsp == NULL) 853 return (ENODEV); 854 } 855 /* 856 * Get vnode to be covered 857 */ 858 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, 859 fspath, td); 860 if ((error = namei(&nd)) != 0) 861 return (error); 862 NDFREE(&nd, NDF_ONLY_PNBUF); 863 vp = nd.ni_vp; 864 if (fsflags & MNT_UPDATE) { 865 if ((vp->v_vflag & VV_ROOT) == 0) { 866 vput(vp); 867 return (EINVAL); 868 } 869 mp = vp->v_mount; 870 MNT_ILOCK(mp); 871 flag = mp->mnt_flag; 872 /* 873 * We only allow the filesystem to be reloaded if it 874 * is currently mounted read-only. 875 */ 876 if ((fsflags & MNT_RELOAD) && 877 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 878 MNT_IUNLOCK(mp); 879 vput(vp); 880 return (EOPNOTSUPP); /* Needs translation */ 881 } 882 MNT_IUNLOCK(mp); 883 /* 884 * Only privileged root, or (if MNT_USER is set) the user that 885 * did the original mount is permitted to update it. 886 */ 887 error = vfs_suser(mp, td); 888 if (error) { 889 vput(vp); 890 return (error); 891 } 892 if (vfs_busy(mp, LK_NOWAIT, 0, td)) { 893 vput(vp); 894 return (EBUSY); 895 } 896 VI_LOCK(vp); 897 if ((vp->v_iflag & VI_MOUNT) != 0 || 898 vp->v_mountedhere != NULL) { 899 VI_UNLOCK(vp); 900 vfs_unbusy(mp, td); 901 vput(vp); 902 return (EBUSY); 903 } 904 vp->v_iflag |= VI_MOUNT; 905 VI_UNLOCK(vp); 906 MNT_ILOCK(mp); 907 mp->mnt_flag |= fsflags & 908 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS); 909 MNT_IUNLOCK(mp); 910 VOP_UNLOCK(vp, 0, td); 911 mp->mnt_optnew = fsdata; 912 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 913 } else { 914 /* 915 * If the user is not root, ensure that they own the directory 916 * onto which we are attempting to mount. 917 */ 918 error = VOP_GETATTR(vp, &va, td->td_ucred, td); 919 if (error) { 920 vput(vp); 921 return (error); 922 } 923 if (va.va_uid != td->td_ucred->cr_uid) { 924 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 925 SUSER_ALLOWJAIL); 926 if (error) { 927 vput(vp); 928 return (error); 929 } 930 } 931 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 932 if (error != 0) { 933 vput(vp); 934 return (error); 935 } 936 if (vp->v_type != VDIR) { 937 vput(vp); 938 return (ENOTDIR); 939 } 940 VI_LOCK(vp); 941 if ((vp->v_iflag & VI_MOUNT) != 0 || 942 vp->v_mountedhere != NULL) { 943 VI_UNLOCK(vp); 944 vput(vp); 945 return (EBUSY); 946 } 947 vp->v_iflag |= VI_MOUNT; 948 VI_UNLOCK(vp); 949 950 /* 951 * Allocate and initialize the filesystem. 952 */ 953 mp = vfs_mount_alloc(vp, vfsp, fspath, td); 954 VOP_UNLOCK(vp, 0, td); 955 956 /* XXXMAC: pass to vfs_mount_alloc? */ 957 mp->mnt_optnew = fsdata; 958 } 959 960 /* 961 * Set the mount level flags. 962 */ 963 MNT_ILOCK(mp); 964 mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) | 965 (fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS | 966 MNT_RDONLY)); 967 if ((mp->mnt_flag & MNT_ASYNC) == 0) 968 mp->mnt_kern_flag &= ~MNTK_ASYNC; 969 MNT_IUNLOCK(mp); 970 /* 971 * Mount the filesystem. 972 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 973 * get. No freeing of cn_pnbuf. 974 */ 975 error = VFS_MOUNT(mp, td); 976 977 /* 978 * Process the export option only if we are 979 * updating mount options. 980 */ 981 if (!error && (fsflags & MNT_UPDATE)) { 982 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 983 sizeof(export)) == 0) 984 error = vfs_export(mp, &export); 985 } 986 987 if (!error) { 988 if (mp->mnt_opt != NULL) 989 vfs_freeopts(mp->mnt_opt); 990 mp->mnt_opt = mp->mnt_optnew; 991 (void)VFS_STATFS(mp, &mp->mnt_stat, td); 992 } 993 /* 994 * Prevent external consumers of mount options from reading 995 * mnt_optnew. 996 */ 997 mp->mnt_optnew = NULL; 998 if (mp->mnt_flag & MNT_UPDATE) { 999 MNT_ILOCK(mp); 1000 if (error) 1001 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | 1002 (flag & ~MNT_QUOTA); 1003 else 1004 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | 1005 MNT_FORCE | MNT_SNAPSHOT); 1006 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1007 mp->mnt_kern_flag |= MNTK_ASYNC; 1008 else 1009 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1010 MNT_IUNLOCK(mp); 1011 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1012 if (mp->mnt_syncer == NULL) 1013 error = vfs_allocate_syncvnode(mp); 1014 } else { 1015 if (mp->mnt_syncer != NULL) 1016 vrele(mp->mnt_syncer); 1017 mp->mnt_syncer = NULL; 1018 } 1019 vfs_unbusy(mp, td); 1020 VI_LOCK(vp); 1021 vp->v_iflag &= ~VI_MOUNT; 1022 VI_UNLOCK(vp); 1023 vrele(vp); 1024 return (error); 1025 } 1026 MNT_ILOCK(mp); 1027 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1028 mp->mnt_kern_flag |= MNTK_ASYNC; 1029 else 1030 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1031 MNT_IUNLOCK(mp); 1032 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1033 /* 1034 * Put the new filesystem on the mount list after root. 1035 */ 1036 cache_purge(vp); 1037 if (!error) { 1038 struct vnode *newdp; 1039 1040 VI_LOCK(vp); 1041 vp->v_iflag &= ~VI_MOUNT; 1042 VI_UNLOCK(vp); 1043 vp->v_mountedhere = mp; 1044 mtx_lock(&mountlist_mtx); 1045 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1046 mtx_unlock(&mountlist_mtx); 1047 vfs_event_signal(NULL, VQ_MOUNT, 0); 1048 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td)) 1049 panic("mount: lost mount"); 1050 mountcheckdirs(vp, newdp); 1051 vput(newdp); 1052 VOP_UNLOCK(vp, 0, td); 1053 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1054 error = vfs_allocate_syncvnode(mp); 1055 vfs_unbusy(mp, td); 1056 if (error) 1057 vrele(vp); 1058 } else { 1059 VI_LOCK(vp); 1060 vp->v_iflag &= ~VI_MOUNT; 1061 VI_UNLOCK(vp); 1062 vfs_unbusy(mp, td); 1063 vfs_mount_destroy(mp); 1064 vput(vp); 1065 } 1066 return (error); 1067 } 1068 1069 /* 1070 * Unmount a filesystem. 1071 * 1072 * Note: unmount takes a path to the vnode mounted on as argument, not 1073 * special file (as before). 1074 */ 1075 #ifndef _SYS_SYSPROTO_H_ 1076 struct unmount_args { 1077 char *path; 1078 int flags; 1079 }; 1080 #endif 1081 /* ARGSUSED */ 1082 int 1083 unmount(td, uap) 1084 struct thread *td; 1085 register struct unmount_args /* { 1086 char *path; 1087 int flags; 1088 } */ *uap; 1089 { 1090 struct mount *mp; 1091 char *pathbuf; 1092 int error, id0, id1; 1093 1094 if (jailed(td->td_ucred) || usermount == 0) { 1095 error = priv_check(td, PRIV_VFS_UNMOUNT); 1096 if (error) 1097 return (error); 1098 } 1099 1100 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1101 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1102 if (error) { 1103 free(pathbuf, M_TEMP); 1104 return (error); 1105 } 1106 AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1); 1107 mtx_lock(&Giant); 1108 if (uap->flags & MNT_BYFSID) { 1109 /* Decode the filesystem ID. */ 1110 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1111 mtx_unlock(&Giant); 1112 free(pathbuf, M_TEMP); 1113 return (EINVAL); 1114 } 1115 1116 mtx_lock(&mountlist_mtx); 1117 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1118 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1119 mp->mnt_stat.f_fsid.val[1] == id1) 1120 break; 1121 } 1122 mtx_unlock(&mountlist_mtx); 1123 } else { 1124 mtx_lock(&mountlist_mtx); 1125 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1126 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1127 break; 1128 } 1129 mtx_unlock(&mountlist_mtx); 1130 } 1131 free(pathbuf, M_TEMP); 1132 if (mp == NULL) { 1133 /* 1134 * Previously we returned ENOENT for a nonexistent path and 1135 * EINVAL for a non-mountpoint. We cannot tell these apart 1136 * now, so in the !MNT_BYFSID case return the more likely 1137 * EINVAL for compatibility. 1138 */ 1139 mtx_unlock(&Giant); 1140 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1141 } 1142 1143 /* 1144 * Don't allow unmounting the root filesystem. 1145 */ 1146 if (mp->mnt_flag & MNT_ROOTFS) { 1147 mtx_unlock(&Giant); 1148 return (EINVAL); 1149 } 1150 error = dounmount(mp, uap->flags, td); 1151 mtx_unlock(&Giant); 1152 return (error); 1153 } 1154 1155 /* 1156 * Do the actual filesystem unmount. 1157 */ 1158 int 1159 dounmount(mp, flags, td) 1160 struct mount *mp; 1161 int flags; 1162 struct thread *td; 1163 { 1164 struct vnode *coveredvp, *fsrootvp; 1165 int error; 1166 int async_flag; 1167 int mnt_gen_r; 1168 1169 mtx_assert(&Giant, MA_OWNED); 1170 1171 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1172 mnt_gen_r = mp->mnt_gen; 1173 VI_LOCK(coveredvp); 1174 vholdl(coveredvp); 1175 error = vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK, td); 1176 vdrop(coveredvp); 1177 /* 1178 * Check for mp being unmounted while waiting for the 1179 * covered vnode lock. 1180 */ 1181 if (error) 1182 return (error); 1183 if (coveredvp->v_mountedhere != mp || 1184 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1185 VOP_UNLOCK(coveredvp, 0, td); 1186 return (EBUSY); 1187 } 1188 } 1189 /* 1190 * Only privileged root, or (if MNT_USER is set) the user that did the 1191 * original mount is permitted to unmount this filesystem. 1192 */ 1193 error = vfs_suser(mp, td); 1194 if (error) { 1195 if (coveredvp) 1196 VOP_UNLOCK(coveredvp, 0, td); 1197 return (error); 1198 } 1199 1200 MNT_ILOCK(mp); 1201 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1202 MNT_IUNLOCK(mp); 1203 if (coveredvp) 1204 VOP_UNLOCK(coveredvp, 0, td); 1205 return (EBUSY); 1206 } 1207 mp->mnt_kern_flag |= MNTK_UNMOUNT; 1208 /* Allow filesystems to detect that a forced unmount is in progress. */ 1209 if (flags & MNT_FORCE) 1210 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1211 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | 1212 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), MNT_MTX(mp), td); 1213 if (error) { 1214 MNT_ILOCK(mp); 1215 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1216 if (mp->mnt_kern_flag & MNTK_MWAIT) 1217 wakeup(mp); 1218 MNT_IUNLOCK(mp); 1219 if (coveredvp) 1220 VOP_UNLOCK(coveredvp, 0, td); 1221 return (error); 1222 } 1223 vn_start_write(NULL, &mp, V_WAIT); 1224 1225 if (mp->mnt_flag & MNT_EXPUBLIC) 1226 vfs_setpublicfs(NULL, NULL, NULL); 1227 1228 vfs_msync(mp, MNT_WAIT); 1229 MNT_ILOCK(mp); 1230 async_flag = mp->mnt_flag & MNT_ASYNC; 1231 mp->mnt_flag &= ~MNT_ASYNC; 1232 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1233 MNT_IUNLOCK(mp); 1234 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1235 if (mp->mnt_syncer != NULL) 1236 vrele(mp->mnt_syncer); 1237 /* 1238 * For forced unmounts, move process cdir/rdir refs on the fs root 1239 * vnode to the covered vnode. For non-forced unmounts we want 1240 * such references to cause an EBUSY error. 1241 */ 1242 if ((flags & MNT_FORCE) && 1243 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1244 if (mp->mnt_vnodecovered != NULL) 1245 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1246 if (fsrootvp == rootvnode) { 1247 vrele(rootvnode); 1248 rootvnode = NULL; 1249 } 1250 vput(fsrootvp); 1251 } 1252 if (((mp->mnt_flag & MNT_RDONLY) || 1253 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || 1254 (flags & MNT_FORCE)) { 1255 error = VFS_UNMOUNT(mp, flags, td); 1256 } 1257 vn_finished_write(mp); 1258 if (error) { 1259 /* Undo cdir/rdir and rootvnode changes made above. */ 1260 if ((flags & MNT_FORCE) && 1261 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1262 if (mp->mnt_vnodecovered != NULL) 1263 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1264 if (rootvnode == NULL) { 1265 rootvnode = fsrootvp; 1266 vref(rootvnode); 1267 } 1268 vput(fsrootvp); 1269 } 1270 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 1271 (void) vfs_allocate_syncvnode(mp); 1272 MNT_ILOCK(mp); 1273 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1274 mp->mnt_flag |= async_flag; 1275 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1276 mp->mnt_kern_flag |= MNTK_ASYNC; 1277 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1278 if (mp->mnt_kern_flag & MNTK_MWAIT) 1279 wakeup(mp); 1280 MNT_IUNLOCK(mp); 1281 if (coveredvp) 1282 VOP_UNLOCK(coveredvp, 0, td); 1283 return (error); 1284 } 1285 mtx_lock(&mountlist_mtx); 1286 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1287 mtx_unlock(&mountlist_mtx); 1288 if (coveredvp != NULL) { 1289 coveredvp->v_mountedhere = NULL; 1290 vput(coveredvp); 1291 } 1292 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1293 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1294 vfs_mount_destroy(mp); 1295 return (0); 1296 } 1297 1298 /* 1299 * --------------------------------------------------------------------- 1300 * Mounting of root filesystem 1301 * 1302 */ 1303 1304 struct root_hold_token { 1305 const char *who; 1306 LIST_ENTRY(root_hold_token) list; 1307 }; 1308 1309 static LIST_HEAD(, root_hold_token) root_holds = 1310 LIST_HEAD_INITIALIZER(&root_holds); 1311 1312 struct root_hold_token * 1313 root_mount_hold(const char *identifier) 1314 { 1315 struct root_hold_token *h; 1316 1317 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 1318 h->who = identifier; 1319 mtx_lock(&mountlist_mtx); 1320 LIST_INSERT_HEAD(&root_holds, h, list); 1321 mtx_unlock(&mountlist_mtx); 1322 return (h); 1323 } 1324 1325 void 1326 root_mount_rel(struct root_hold_token *h) 1327 { 1328 1329 mtx_lock(&mountlist_mtx); 1330 LIST_REMOVE(h, list); 1331 wakeup(&root_holds); 1332 mtx_unlock(&mountlist_mtx); 1333 free(h, M_DEVBUF); 1334 } 1335 1336 static void 1337 root_mount_wait(void) 1338 { 1339 struct root_hold_token *h; 1340 1341 for (;;) { 1342 DROP_GIANT(); 1343 g_waitidle(); 1344 PICKUP_GIANT(); 1345 mtx_lock(&mountlist_mtx); 1346 if (LIST_EMPTY(&root_holds)) { 1347 mtx_unlock(&mountlist_mtx); 1348 break; 1349 } 1350 printf("Root mount waiting for:"); 1351 LIST_FOREACH(h, &root_holds, list) 1352 printf(" %s", h->who); 1353 printf("\n"); 1354 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 1355 hz); 1356 } 1357 } 1358 1359 static void 1360 set_rootvnode(struct thread *td) 1361 { 1362 struct proc *p; 1363 1364 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td)) 1365 panic("Cannot find root vnode"); 1366 1367 p = td->td_proc; 1368 FILEDESC_LOCK(p->p_fd); 1369 1370 if (p->p_fd->fd_cdir != NULL) 1371 vrele(p->p_fd->fd_cdir); 1372 p->p_fd->fd_cdir = rootvnode; 1373 VREF(rootvnode); 1374 1375 if (p->p_fd->fd_rdir != NULL) 1376 vrele(p->p_fd->fd_rdir); 1377 p->p_fd->fd_rdir = rootvnode; 1378 VREF(rootvnode); 1379 1380 FILEDESC_UNLOCK(p->p_fd); 1381 1382 VOP_UNLOCK(rootvnode, 0, td); 1383 } 1384 1385 /* 1386 * Mount /devfs as our root filesystem, but do not put it on the mountlist 1387 * yet. Create a /dev -> / symlink so that absolute pathnames will lookup. 1388 */ 1389 1390 static void 1391 devfs_first(void) 1392 { 1393 struct thread *td = curthread; 1394 struct vfsoptlist *opts; 1395 struct vfsconf *vfsp; 1396 struct mount *mp = NULL; 1397 int error; 1398 1399 vfsp = vfs_byname("devfs"); 1400 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 1401 if (vfsp == NULL) 1402 return; 1403 1404 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td); 1405 1406 error = VFS_MOUNT(mp, td); 1407 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 1408 if (error) 1409 return; 1410 1411 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 1412 TAILQ_INIT(opts); 1413 mp->mnt_opt = opts; 1414 1415 mtx_lock(&mountlist_mtx); 1416 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 1417 mtx_unlock(&mountlist_mtx); 1418 1419 set_rootvnode(td); 1420 1421 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 1422 if (error) 1423 printf("kern_symlink /dev -> / returns %d\n", error); 1424 } 1425 1426 /* 1427 * Surgically move our devfs to be mounted on /dev. 1428 */ 1429 1430 static void 1431 devfs_fixup(struct thread *td) 1432 { 1433 struct nameidata nd; 1434 int error; 1435 struct vnode *vp, *dvp; 1436 struct mount *mp; 1437 1438 /* Remove our devfs mount from the mountlist and purge the cache */ 1439 mtx_lock(&mountlist_mtx); 1440 mp = TAILQ_FIRST(&mountlist); 1441 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1442 mtx_unlock(&mountlist_mtx); 1443 cache_purgevfs(mp); 1444 1445 VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td); 1446 VI_LOCK(dvp); 1447 dvp->v_iflag &= ~VI_MOUNT; 1448 dvp->v_mountedhere = NULL; 1449 VI_UNLOCK(dvp); 1450 1451 /* Set up the real rootvnode, and purge the cache */ 1452 TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL; 1453 set_rootvnode(td); 1454 cache_purgevfs(rootvnode->v_mount); 1455 1456 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 1457 error = namei(&nd); 1458 if (error) { 1459 printf("Lookup of /dev for devfs, error: %d\n", error); 1460 return; 1461 } 1462 NDFREE(&nd, NDF_ONLY_PNBUF); 1463 vp = nd.ni_vp; 1464 if (vp->v_type != VDIR) { 1465 vput(vp); 1466 } 1467 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 1468 if (error) { 1469 vput(vp); 1470 } 1471 cache_purge(vp); 1472 mp->mnt_vnodecovered = vp; 1473 vp->v_mountedhere = mp; 1474 mtx_lock(&mountlist_mtx); 1475 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1476 mtx_unlock(&mountlist_mtx); 1477 VOP_UNLOCK(vp, 0, td); 1478 vput(dvp); 1479 vfs_unbusy(mp, td); 1480 1481 /* Unlink the no longer needed /dev/dev -> / symlink */ 1482 kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 1483 } 1484 1485 /* 1486 * Report errors during filesystem mounting. 1487 */ 1488 void 1489 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1490 { 1491 struct vfsoptlist *moptlist = mp->mnt_optnew; 1492 va_list ap; 1493 int error, len; 1494 char *errmsg; 1495 1496 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1497 if (error || errmsg == NULL || len <= 0) 1498 return; 1499 1500 va_start(ap, fmt); 1501 vsnprintf(errmsg, (size_t)len, fmt, ap); 1502 va_end(ap); 1503 } 1504 1505 /* 1506 * Find and mount the root filesystem 1507 */ 1508 void 1509 vfs_mountroot(void) 1510 { 1511 char *cp; 1512 int error, i, asked = 0; 1513 1514 root_mount_wait(); 1515 1516 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), 1517 NULL, NULL, mount_init, mount_fini, 1518 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1519 devfs_first(); 1520 1521 /* 1522 * We are booted with instructions to prompt for the root filesystem. 1523 */ 1524 if (boothowto & RB_ASKNAME) { 1525 if (!vfs_mountroot_ask()) 1526 return; 1527 asked = 1; 1528 } 1529 1530 /* 1531 * The root filesystem information is compiled in, and we are 1532 * booted with instructions to use it. 1533 */ 1534 if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) { 1535 if (!vfs_mountroot_try(ctrootdevname)) 1536 return; 1537 ctrootdevname = NULL; 1538 } 1539 1540 /* 1541 * We've been given the generic "use CDROM as root" flag. This is 1542 * necessary because one media may be used in many different 1543 * devices, so we need to search for them. 1544 */ 1545 if (boothowto & RB_CDROM) { 1546 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 1547 if (!vfs_mountroot_try(cdrom_rootdevnames[i])) 1548 return; 1549 } 1550 } 1551 1552 /* 1553 * Try to use the value read by the loader from /etc/fstab, or 1554 * supplied via some other means. This is the preferred 1555 * mechanism. 1556 */ 1557 cp = getenv("vfs.root.mountfrom"); 1558 if (cp != NULL) { 1559 error = vfs_mountroot_try(cp); 1560 freeenv(cp); 1561 if (!error) 1562 return; 1563 } 1564 1565 /* 1566 * Try values that may have been computed by code during boot 1567 */ 1568 if (!vfs_mountroot_try(rootdevnames[0])) 1569 return; 1570 if (!vfs_mountroot_try(rootdevnames[1])) 1571 return; 1572 1573 /* 1574 * If we (still) have a compiled-in default, try it. 1575 */ 1576 if (ctrootdevname != NULL) 1577 if (!vfs_mountroot_try(ctrootdevname)) 1578 return; 1579 /* 1580 * Everything so far has failed, prompt on the console if we haven't 1581 * already tried that. 1582 */ 1583 if (!asked) 1584 if (!vfs_mountroot_ask()) 1585 return; 1586 1587 panic("Root mount failed, startup aborted."); 1588 } 1589 1590 /* 1591 * Mount (mountfrom) as the root filesystem. 1592 */ 1593 static int 1594 vfs_mountroot_try(const char *mountfrom) 1595 { 1596 struct mount *mp; 1597 char *vfsname, *path; 1598 time_t timebase; 1599 int error; 1600 char patt[32]; 1601 1602 vfsname = NULL; 1603 path = NULL; 1604 mp = NULL; 1605 error = EINVAL; 1606 1607 if (mountfrom == NULL) 1608 return (error); /* don't complain */ 1609 printf("Trying to mount root from %s\n", mountfrom); 1610 1611 /* parse vfs name and path */ 1612 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1613 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 1614 vfsname[0] = path[0] = 0; 1615 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 1616 if (sscanf(mountfrom, patt, vfsname, path) < 1) 1617 goto out; 1618 1619 if (path[0] == '\0') 1620 strcpy(path, ROOTNAME); 1621 1622 error = kernel_vmount( 1623 MNT_RDONLY | MNT_ROOTFS, 1624 "fstype", vfsname, 1625 "fspath", "/", 1626 "from", path, 1627 NULL); 1628 if (error == 0) { 1629 /* 1630 * We mount devfs prior to mounting the / FS, so the first 1631 * entry will typically be devfs. 1632 */ 1633 mp = TAILQ_FIRST(&mountlist); 1634 KASSERT(mp != NULL, ("%s: mountlist is empty", __func__)); 1635 1636 /* 1637 * Iterate over all currently mounted file systems and use 1638 * the time stamp found to check and/or initialize the RTC. 1639 * Typically devfs has no time stamp and the only other FS 1640 * is the actual / FS. 1641 * Call inittodr() only once and pass it the largest of the 1642 * timestamps we encounter. 1643 */ 1644 timebase = 0; 1645 do { 1646 if (mp->mnt_time > timebase) 1647 timebase = mp->mnt_time; 1648 mp = TAILQ_NEXT(mp, mnt_list); 1649 } while (mp != NULL); 1650 inittodr(timebase); 1651 1652 devfs_fixup(curthread); 1653 } 1654 out: 1655 free(path, M_MOUNT); 1656 free(vfsname, M_MOUNT); 1657 return (error); 1658 } 1659 1660 /* 1661 * --------------------------------------------------------------------- 1662 * Interactive root filesystem selection code. 1663 */ 1664 1665 static int 1666 vfs_mountroot_ask(void) 1667 { 1668 char name[128]; 1669 1670 for(;;) { 1671 printf("\nManual root filesystem specification:\n"); 1672 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 1673 #if defined(__amd64__) || defined(__i386__) || defined(__ia64__) 1674 printf(" eg. ufs:da0s1a\n"); 1675 #else 1676 printf(" eg. ufs:/dev/da0a\n"); 1677 #endif 1678 printf(" ? List valid disk boot devices\n"); 1679 printf(" <empty line> Abort manual input\n"); 1680 printf("\nmountroot> "); 1681 gets(name, sizeof(name), 1); 1682 if (name[0] == '\0') 1683 return (1); 1684 if (name[0] == '?') { 1685 printf("\nList of GEOM managed disk devices:\n "); 1686 g_dev_print(); 1687 continue; 1688 } 1689 if (!vfs_mountroot_try(name)) 1690 return (0); 1691 } 1692 } 1693 1694 /* 1695 * --------------------------------------------------------------------- 1696 * Functions for querying mount options/arguments from filesystems. 1697 */ 1698 1699 /* 1700 * Check that no unknown options are given 1701 */ 1702 int 1703 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1704 { 1705 struct vfsopt *opt; 1706 const char **t, *p; 1707 1708 TAILQ_FOREACH(opt, opts, link) { 1709 p = opt->name; 1710 if (p[0] == 'n' && p[1] == 'o') 1711 p += 2; 1712 for(t = global_opts; *t != NULL; t++) 1713 if (!strcmp(*t, p)) 1714 break; 1715 if (*t != NULL) 1716 continue; 1717 for(t = legal; *t != NULL; t++) 1718 if (!strcmp(*t, p)) 1719 break; 1720 if (*t != NULL) 1721 continue; 1722 printf("mount option <%s> is unknown\n", p); 1723 return (EINVAL); 1724 } 1725 return (0); 1726 } 1727 1728 /* 1729 * Get a mount option by its name. 1730 * 1731 * Return 0 if the option was found, ENOENT otherwise. 1732 * If len is non-NULL it will be filled with the length 1733 * of the option. If buf is non-NULL, it will be filled 1734 * with the address of the option. 1735 */ 1736 int 1737 vfs_getopt(opts, name, buf, len) 1738 struct vfsoptlist *opts; 1739 const char *name; 1740 void **buf; 1741 int *len; 1742 { 1743 struct vfsopt *opt; 1744 1745 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1746 1747 TAILQ_FOREACH(opt, opts, link) { 1748 if (strcmp(name, opt->name) == 0) { 1749 if (len != NULL) 1750 *len = opt->len; 1751 if (buf != NULL) 1752 *buf = opt->value; 1753 return (0); 1754 } 1755 } 1756 return (ENOENT); 1757 } 1758 1759 static int 1760 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1761 { 1762 struct vfsopt *opt; 1763 int i; 1764 1765 if (opts == NULL) 1766 return (-1); 1767 1768 i = 0; 1769 TAILQ_FOREACH(opt, opts, link) { 1770 if (strcmp(name, opt->name) == 0) 1771 return (i); 1772 ++i; 1773 } 1774 return (-1); 1775 } 1776 1777 char * 1778 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1779 { 1780 struct vfsopt *opt; 1781 1782 *error = 0; 1783 TAILQ_FOREACH(opt, opts, link) { 1784 if (strcmp(name, opt->name) != 0) 1785 continue; 1786 if (((char *)opt->value)[opt->len - 1] != '\0') { 1787 *error = EINVAL; 1788 return (NULL); 1789 } 1790 return (opt->value); 1791 } 1792 *error = ENOENT; 1793 return (NULL); 1794 } 1795 1796 int 1797 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1798 { 1799 struct vfsopt *opt; 1800 1801 TAILQ_FOREACH(opt, opts, link) { 1802 if (strcmp(name, opt->name) == 0) { 1803 if (w != NULL) 1804 *w |= val; 1805 return (1); 1806 } 1807 } 1808 if (w != NULL) 1809 *w &= ~val; 1810 return (0); 1811 } 1812 1813 int 1814 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1815 { 1816 va_list ap; 1817 struct vfsopt *opt; 1818 int ret; 1819 1820 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1821 1822 TAILQ_FOREACH(opt, opts, link) { 1823 if (strcmp(name, opt->name) != 0) 1824 continue; 1825 if (((char *)opt->value)[opt->len - 1] != '\0') 1826 return (0); 1827 va_start(ap, fmt); 1828 ret = vsscanf(opt->value, fmt, ap); 1829 va_end(ap); 1830 return (ret); 1831 } 1832 return (0); 1833 } 1834 1835 /* 1836 * Find and copy a mount option. 1837 * 1838 * The size of the buffer has to be specified 1839 * in len, if it is not the same length as the 1840 * mount option, EINVAL is returned. 1841 * Returns ENOENT if the option is not found. 1842 */ 1843 int 1844 vfs_copyopt(opts, name, dest, len) 1845 struct vfsoptlist *opts; 1846 const char *name; 1847 void *dest; 1848 int len; 1849 { 1850 struct vfsopt *opt; 1851 1852 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1853 1854 TAILQ_FOREACH(opt, opts, link) { 1855 if (strcmp(name, opt->name) == 0) { 1856 if (len != opt->len) 1857 return (EINVAL); 1858 bcopy(opt->value, dest, opt->len); 1859 return (0); 1860 } 1861 } 1862 return (ENOENT); 1863 } 1864 1865 /* 1866 * This is a helper function for filesystems to traverse their 1867 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1868 */ 1869 1870 struct vnode * 1871 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1872 { 1873 struct vnode *vp; 1874 1875 mtx_assert(MNT_MTX(mp), MA_OWNED); 1876 1877 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1878 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1879 while (vp != NULL && vp->v_type == VMARKER) 1880 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1881 1882 /* Check if we are done */ 1883 if (vp == NULL) { 1884 __mnt_vnode_markerfree(mvp, mp); 1885 return (NULL); 1886 } 1887 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1888 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1889 return (vp); 1890 } 1891 1892 struct vnode * 1893 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1894 { 1895 struct vnode *vp; 1896 1897 mtx_assert(MNT_MTX(mp), MA_OWNED); 1898 1899 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1900 while (vp != NULL && vp->v_type == VMARKER) 1901 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1902 1903 /* Check if we are done */ 1904 if (vp == NULL) { 1905 *mvp = NULL; 1906 return (NULL); 1907 } 1908 mp->mnt_holdcnt++; 1909 MNT_IUNLOCK(mp); 1910 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1911 M_VNODE_MARKER, 1912 M_WAITOK | M_ZERO); 1913 MNT_ILOCK(mp); 1914 (*mvp)->v_type = VMARKER; 1915 1916 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1917 while (vp != NULL && vp->v_type == VMARKER) 1918 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1919 1920 /* Check if we are done */ 1921 if (vp == NULL) { 1922 MNT_IUNLOCK(mp); 1923 free(*mvp, M_VNODE_MARKER); 1924 MNT_ILOCK(mp); 1925 *mvp = NULL; 1926 mp->mnt_holdcnt--; 1927 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1928 wakeup(&mp->mnt_holdcnt); 1929 return (NULL); 1930 } 1931 mp->mnt_markercnt++; 1932 (*mvp)->v_mount = mp; 1933 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1934 return (vp); 1935 } 1936 1937 1938 void 1939 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1940 { 1941 1942 if (*mvp == NULL) 1943 return; 1944 1945 mtx_assert(MNT_MTX(mp), MA_OWNED); 1946 1947 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1948 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1949 MNT_IUNLOCK(mp); 1950 free(*mvp, M_VNODE_MARKER); 1951 MNT_ILOCK(mp); 1952 *mvp = NULL; 1953 1954 mp->mnt_markercnt--; 1955 mp->mnt_holdcnt--; 1956 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1957 wakeup(&mp->mnt_holdcnt); 1958 } 1959 1960 1961 int 1962 __vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 1963 { 1964 int error; 1965 1966 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td); 1967 if (sbp != &mp->mnt_stat) 1968 *sbp = mp->mnt_stat; 1969 return (error); 1970 } 1971 1972 void 1973 vfs_mountedfrom(struct mount *mp, const char *from) 1974 { 1975 1976 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1977 strlcpy(mp->mnt_stat.f_mntfromname, from, 1978 sizeof mp->mnt_stat.f_mntfromname); 1979 } 1980 1981 /* 1982 * --------------------------------------------------------------------- 1983 * This is the api for building mount args and mounting filesystems from 1984 * inside the kernel. 1985 * 1986 * The API works by accumulation of individual args. First error is 1987 * latched. 1988 * 1989 * XXX: should be documented in new manpage kernel_mount(9) 1990 */ 1991 1992 /* A memory allocation which must be freed when we are done */ 1993 struct mntaarg { 1994 SLIST_ENTRY(mntaarg) next; 1995 }; 1996 1997 /* The header for the mount arguments */ 1998 struct mntarg { 1999 struct iovec *v; 2000 int len; 2001 int error; 2002 SLIST_HEAD(, mntaarg) list; 2003 }; 2004 2005 /* 2006 * Add a boolean argument. 2007 * 2008 * flag is the boolean value. 2009 * name must start with "no". 2010 */ 2011 struct mntarg * 2012 mount_argb(struct mntarg *ma, int flag, const char *name) 2013 { 2014 2015 KASSERT(name[0] == 'n' && name[1] == 'o', 2016 ("mount_argb(...,%s): name must start with 'no'", name)); 2017 2018 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 2019 } 2020 2021 /* 2022 * Add an argument printf style 2023 */ 2024 struct mntarg * 2025 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 2026 { 2027 va_list ap; 2028 struct mntaarg *maa; 2029 struct sbuf *sb; 2030 int len; 2031 2032 if (ma == NULL) { 2033 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2034 SLIST_INIT(&ma->list); 2035 } 2036 if (ma->error) 2037 return (ma); 2038 2039 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2040 M_MOUNT, M_WAITOK); 2041 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2042 ma->v[ma->len].iov_len = strlen(name) + 1; 2043 ma->len++; 2044 2045 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 2046 va_start(ap, fmt); 2047 sbuf_vprintf(sb, fmt, ap); 2048 va_end(ap); 2049 sbuf_finish(sb); 2050 len = sbuf_len(sb) + 1; 2051 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2052 SLIST_INSERT_HEAD(&ma->list, maa, next); 2053 bcopy(sbuf_data(sb), maa + 1, len); 2054 sbuf_delete(sb); 2055 2056 ma->v[ma->len].iov_base = maa + 1; 2057 ma->v[ma->len].iov_len = len; 2058 ma->len++; 2059 2060 return (ma); 2061 } 2062 2063 /* 2064 * Add an argument which is a userland string. 2065 */ 2066 struct mntarg * 2067 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 2068 { 2069 struct mntaarg *maa; 2070 char *tbuf; 2071 2072 if (val == NULL) 2073 return (ma); 2074 if (ma == NULL) { 2075 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2076 SLIST_INIT(&ma->list); 2077 } 2078 if (ma->error) 2079 return (ma); 2080 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2081 SLIST_INSERT_HEAD(&ma->list, maa, next); 2082 tbuf = (void *)(maa + 1); 2083 ma->error = copyinstr(val, tbuf, len, NULL); 2084 return (mount_arg(ma, name, tbuf, -1)); 2085 } 2086 2087 /* 2088 * Plain argument. 2089 * 2090 * If length is -1, use printf. 2091 */ 2092 struct mntarg * 2093 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 2094 { 2095 2096 if (ma == NULL) { 2097 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2098 SLIST_INIT(&ma->list); 2099 } 2100 if (ma->error) 2101 return (ma); 2102 2103 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2104 M_MOUNT, M_WAITOK); 2105 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2106 ma->v[ma->len].iov_len = strlen(name) + 1; 2107 ma->len++; 2108 2109 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 2110 if (len < 0) 2111 ma->v[ma->len].iov_len = strlen(val) + 1; 2112 else 2113 ma->v[ma->len].iov_len = len; 2114 ma->len++; 2115 return (ma); 2116 } 2117 2118 /* 2119 * Free a mntarg structure 2120 */ 2121 static void 2122 free_mntarg(struct mntarg *ma) 2123 { 2124 struct mntaarg *maa; 2125 2126 while (!SLIST_EMPTY(&ma->list)) { 2127 maa = SLIST_FIRST(&ma->list); 2128 SLIST_REMOVE_HEAD(&ma->list, next); 2129 free(maa, M_MOUNT); 2130 } 2131 free(ma->v, M_MOUNT); 2132 free(ma, M_MOUNT); 2133 } 2134 2135 /* 2136 * Mount a filesystem 2137 */ 2138 int 2139 kernel_mount(struct mntarg *ma, int flags) 2140 { 2141 struct uio auio; 2142 int error; 2143 2144 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2145 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2146 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2147 2148 auio.uio_iov = ma->v; 2149 auio.uio_iovcnt = ma->len; 2150 auio.uio_segflg = UIO_SYSSPACE; 2151 2152 error = ma->error; 2153 if (!error) 2154 error = vfs_donmount(curthread, flags, &auio); 2155 free_mntarg(ma); 2156 return (error); 2157 } 2158 2159 /* 2160 * A printflike function to mount a filesystem. 2161 */ 2162 int 2163 kernel_vmount(int flags, ...) 2164 { 2165 struct mntarg *ma = NULL; 2166 va_list ap; 2167 const char *cp; 2168 const void *vp; 2169 int error; 2170 2171 va_start(ap, flags); 2172 for (;;) { 2173 cp = va_arg(ap, const char *); 2174 if (cp == NULL) 2175 break; 2176 vp = va_arg(ap, const void *); 2177 ma = mount_arg(ma, cp, vp, -1); 2178 } 2179 va_end(ap); 2180 2181 error = kernel_mount(ma, flags); 2182 return (error); 2183 } 2184