Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_mount.c
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1 /*- 2 * Copyright (c) 1999-2004 Poul-Henning Kamp 3 * Copyright (c) 1999 Michael Smith 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD: releng/8.0/sys/kern/vfs_mount.c 195995 2009-07-31 13:40:06Z jhb $"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/fcntl.h> 43 #include <sys/jail.h> 44 #include <sys/kernel.h> 45 #include <sys/libkern.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/priv.h> 51 #include <sys/proc.h> 52 #include <sys/filedesc.h> 53 #include <sys/reboot.h> 54 #include <sys/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 72 #define ROOTNAME "root_device" 73 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 74 75 static void set_rootvnode(void); 76 static int vfs_domount(struct thread *td, const char *fstype, 77 char *fspath, int fsflags, void *fsdata); 78 static int vfs_mountroot_ask(void); 79 static int vfs_mountroot_try(const char *mountfrom, const char *options); 80 static void free_mntarg(struct mntarg *ma); 81 82 static int usermount = 0; 83 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 84 "Unprivileged users may mount and unmount file systems"); 85 86 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 87 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 88 static uma_zone_t mount_zone; 89 90 /* List of mounted filesystems. */ 91 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 92 93 /* For any iteration/modification of mountlist */ 94 struct mtx mountlist_mtx; 95 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 96 97 /* 98 * The vnode of the system's root (/ in the filesystem, without chroot 99 * active.) 100 */ 101 struct vnode *rootvnode; 102 103 /* 104 * The root filesystem is detailed in the kernel environment variable 105 * vfs.root.mountfrom, which is expected to be in the general format 106 * 107 * <vfsname>:[<path>] 108 * vfsname := the name of a VFS known to the kernel and capable 109 * of being mounted as root 110 * path := disk device name or other data used by the filesystem 111 * to locate its physical store 112 * 113 * The environment variable vfs.root.mountfrom options is a comma delimited 114 * set of string mount options. These mount options must be parseable 115 * by nmount() in the kernel. 116 */ 117 118 /* 119 * Global opts, taken by all filesystems 120 */ 121 static const char *global_opts[] = { 122 "errmsg", 123 "fstype", 124 "fspath", 125 "ro", 126 "rw", 127 "nosuid", 128 "noexec", 129 NULL 130 }; 131 132 /* 133 * The root specifiers we will try if RB_CDROM is specified. 134 */ 135 static char *cdrom_rootdevnames[] = { 136 "cd9660:cd0", 137 "cd9660:acd0", 138 NULL 139 }; 140 141 /* legacy find-root code */ 142 char *rootdevnames[2] = {NULL, NULL}; 143 #ifndef ROOTDEVNAME 144 # define ROOTDEVNAME NULL 145 #endif 146 static const char *ctrootdevname = ROOTDEVNAME; 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 /* 192 * Check if options are equal (with or without the "no" prefix). 193 */ 194 static int 195 vfs_equalopts(const char *opt1, const char *opt2) 196 { 197 char *p; 198 199 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 200 if (strcmp(opt1, opt2) == 0) 201 return (1); 202 /* "noopt" vs. "opt" */ 203 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 204 return (1); 205 /* "opt" vs. "noopt" */ 206 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 207 return (1); 208 while ((p = strchr(opt1, '.')) != NULL && 209 !strncmp(opt1, opt2, ++p - opt1)) { 210 opt2 += p - opt1; 211 opt1 = p; 212 /* "foo.noopt" vs. "foo.opt" */ 213 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 214 return (1); 215 /* "foo.opt" vs. "foo.noopt" */ 216 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 217 return (1); 218 } 219 return (0); 220 } 221 222 /* 223 * If a mount option is specified several times, 224 * (with or without the "no" prefix) only keep 225 * the last occurence of it. 226 */ 227 static void 228 vfs_sanitizeopts(struct vfsoptlist *opts) 229 { 230 struct vfsopt *opt, *opt2, *tmp; 231 232 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 233 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 234 while (opt2 != NULL) { 235 if (vfs_equalopts(opt->name, opt2->name)) { 236 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 237 vfs_freeopt(opts, opt2); 238 opt2 = tmp; 239 } else { 240 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 241 } 242 } 243 } 244 } 245 246 /* 247 * Build a linked list of mount options from a struct uio. 248 */ 249 int 250 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 251 { 252 struct vfsoptlist *opts; 253 struct vfsopt *opt; 254 size_t memused, namelen, optlen; 255 unsigned int i, iovcnt; 256 int error; 257 258 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 259 TAILQ_INIT(opts); 260 memused = 0; 261 iovcnt = auio->uio_iovcnt; 262 for (i = 0; i < iovcnt; i += 2) { 263 namelen = auio->uio_iov[i].iov_len; 264 optlen = auio->uio_iov[i + 1].iov_len; 265 memused += sizeof(struct vfsopt) + optlen + namelen; 266 /* 267 * Avoid consuming too much memory, and attempts to overflow 268 * memused. 269 */ 270 if (memused > VFS_MOUNTARG_SIZE_MAX || 271 optlen > VFS_MOUNTARG_SIZE_MAX || 272 namelen > VFS_MOUNTARG_SIZE_MAX) { 273 error = EINVAL; 274 goto bad; 275 } 276 277 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 278 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 279 opt->value = NULL; 280 opt->len = 0; 281 opt->pos = i / 2; 282 opt->seen = 0; 283 284 /* 285 * Do this early, so jumps to "bad" will free the current 286 * option. 287 */ 288 TAILQ_INSERT_TAIL(opts, opt, link); 289 290 if (auio->uio_segflg == UIO_SYSSPACE) { 291 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 292 } else { 293 error = copyin(auio->uio_iov[i].iov_base, opt->name, 294 namelen); 295 if (error) 296 goto bad; 297 } 298 /* Ensure names are null-terminated strings. */ 299 if (namelen == 0 || opt->name[namelen - 1] != '\0') { 300 error = EINVAL; 301 goto bad; 302 } 303 if (optlen != 0) { 304 opt->len = optlen; 305 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 306 if (auio->uio_segflg == UIO_SYSSPACE) { 307 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 308 optlen); 309 } else { 310 error = copyin(auio->uio_iov[i + 1].iov_base, 311 opt->value, optlen); 312 if (error) 313 goto bad; 314 } 315 } 316 } 317 vfs_sanitizeopts(opts); 318 *options = opts; 319 return (0); 320 bad: 321 vfs_freeopts(opts); 322 return (error); 323 } 324 325 /* 326 * Merge the old mount options with the new ones passed 327 * in the MNT_UPDATE case. 328 * 329 * XXX This function will keep a "nofoo" option in the 330 * new options if there is no matching "foo" option 331 * to be cancelled in the old options. This is a bug 332 * if the option's canonical name is "foo". E.g., "noro" 333 * shouldn't end up in the mount point's active options, 334 * but it can. 335 */ 336 static void 337 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 338 { 339 struct vfsopt *opt, *opt2, *new; 340 341 TAILQ_FOREACH(opt, opts, link) { 342 /* 343 * Check that this option hasn't been redefined 344 * nor cancelled with a "no" mount option. 345 */ 346 opt2 = TAILQ_FIRST(toopts); 347 while (opt2 != NULL) { 348 if (strcmp(opt2->name, opt->name) == 0) 349 goto next; 350 if (strncmp(opt2->name, "no", 2) == 0 && 351 strcmp(opt2->name + 2, opt->name) == 0) { 352 vfs_freeopt(toopts, opt2); 353 goto next; 354 } 355 opt2 = TAILQ_NEXT(opt2, link); 356 } 357 /* We want this option, duplicate it. */ 358 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 359 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 360 strcpy(new->name, opt->name); 361 if (opt->len != 0) { 362 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 363 bcopy(opt->value, new->value, opt->len); 364 } else { 365 new->value = NULL; 366 } 367 new->len = opt->len; 368 new->seen = opt->seen; 369 TAILQ_INSERT_TAIL(toopts, new, link); 370 next: 371 continue; 372 } 373 } 374 375 /* 376 * Mount a filesystem. 377 */ 378 int 379 nmount(td, uap) 380 struct thread *td; 381 struct nmount_args /* { 382 struct iovec *iovp; 383 unsigned int iovcnt; 384 int flags; 385 } */ *uap; 386 { 387 struct uio *auio; 388 int error; 389 u_int iovcnt; 390 391 AUDIT_ARG_FFLAGS(uap->flags); 392 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__, 393 uap->iovp, uap->iovcnt, uap->flags); 394 395 /* 396 * Filter out MNT_ROOTFS. We do not want clients of nmount() in 397 * userspace to set this flag, but we must filter it out if we want 398 * MNT_UPDATE on the root file system to work. 399 * MNT_ROOTFS should only be set in the kernel in vfs_mountroot_try(). 400 */ 401 uap->flags &= ~MNT_ROOTFS; 402 403 iovcnt = uap->iovcnt; 404 /* 405 * Check that we have an even number of iovec's 406 * and that we have at least two options. 407 */ 408 if ((iovcnt & 1) || (iovcnt < 4)) { 409 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__, 410 uap->iovcnt); 411 return (EINVAL); 412 } 413 414 error = copyinuio(uap->iovp, iovcnt, &auio); 415 if (error) { 416 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno", 417 __func__, error); 418 return (error); 419 } 420 error = vfs_donmount(td, uap->flags, auio); 421 422 free(auio, M_IOV); 423 return (error); 424 } 425 426 /* 427 * --------------------------------------------------------------------- 428 * Various utility functions 429 */ 430 431 void 432 vfs_ref(struct mount *mp) 433 { 434 435 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 436 MNT_ILOCK(mp); 437 MNT_REF(mp); 438 MNT_IUNLOCK(mp); 439 } 440 441 void 442 vfs_rel(struct mount *mp) 443 { 444 445 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 446 MNT_ILOCK(mp); 447 MNT_REL(mp); 448 MNT_IUNLOCK(mp); 449 } 450 451 static int 452 mount_init(void *mem, int size, int flags) 453 { 454 struct mount *mp; 455 456 mp = (struct mount *)mem; 457 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 458 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0); 459 return (0); 460 } 461 462 static void 463 mount_fini(void *mem, int size) 464 { 465 struct mount *mp; 466 467 mp = (struct mount *)mem; 468 lockdestroy(&mp->mnt_explock); 469 mtx_destroy(&mp->mnt_mtx); 470 } 471 472 /* 473 * Allocate and initialize the mount point struct. 474 */ 475 struct mount * 476 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath, 477 struct ucred *cred) 478 { 479 struct mount *mp; 480 481 mp = uma_zalloc(mount_zone, M_WAITOK); 482 bzero(&mp->mnt_startzero, 483 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 484 TAILQ_INIT(&mp->mnt_nvnodelist); 485 mp->mnt_nvnodelistsize = 0; 486 mp->mnt_ref = 0; 487 (void) vfs_busy(mp, MBF_NOWAIT); 488 mp->mnt_op = vfsp->vfc_vfsops; 489 mp->mnt_vfc = vfsp; 490 vfsp->vfc_refcount++; /* XXX Unlocked */ 491 mp->mnt_stat.f_type = vfsp->vfc_typenum; 492 mp->mnt_gen++; 493 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 494 mp->mnt_vnodecovered = vp; 495 mp->mnt_cred = crdup(cred); 496 mp->mnt_stat.f_owner = cred->cr_uid; 497 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 498 mp->mnt_iosize_max = DFLTPHYS; 499 #ifdef MAC 500 mac_mount_init(mp); 501 mac_mount_create(cred, mp); 502 #endif 503 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 504 return (mp); 505 } 506 507 /* 508 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 509 */ 510 void 511 vfs_mount_destroy(struct mount *mp) 512 { 513 514 MNT_ILOCK(mp); 515 mp->mnt_kern_flag |= MNTK_REFEXPIRE; 516 if (mp->mnt_kern_flag & MNTK_MWAIT) { 517 mp->mnt_kern_flag &= ~MNTK_MWAIT; 518 wakeup(mp); 519 } 520 while (mp->mnt_ref) 521 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0); 522 KASSERT(mp->mnt_ref == 0, 523 ("%s: invalid refcount in the drain path @ %s:%d", __func__, 524 __FILE__, __LINE__)); 525 if (mp->mnt_writeopcount != 0) 526 panic("vfs_mount_destroy: nonzero writeopcount"); 527 if (mp->mnt_secondary_writes != 0) 528 panic("vfs_mount_destroy: nonzero secondary_writes"); 529 mp->mnt_vfc->vfc_refcount--; 530 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 531 struct vnode *vp; 532 533 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 534 vprint("", vp); 535 panic("unmount: dangling vnode"); 536 } 537 if (mp->mnt_nvnodelistsize != 0) 538 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 539 if (mp->mnt_lockref != 0) 540 panic("vfs_mount_destroy: nonzero lock refcount"); 541 MNT_IUNLOCK(mp); 542 #ifdef MAC 543 mac_mount_destroy(mp); 544 #endif 545 if (mp->mnt_opt != NULL) 546 vfs_freeopts(mp->mnt_opt); 547 crfree(mp->mnt_cred); 548 uma_zfree(mount_zone, mp); 549 } 550 551 int 552 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 553 { 554 struct vfsoptlist *optlist; 555 struct vfsopt *opt, *noro_opt, *tmp_opt; 556 char *fstype, *fspath, *errmsg; 557 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 558 int has_rw, has_noro; 559 560 errmsg = fspath = NULL; 561 errmsg_len = has_noro = has_rw = fspathlen = 0; 562 errmsg_pos = -1; 563 564 error = vfs_buildopts(fsoptions, &optlist); 565 if (error) 566 return (error); 567 568 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 569 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 570 571 /* 572 * We need these two options before the others, 573 * and they are mandatory for any filesystem. 574 * Ensure they are NUL terminated as well. 575 */ 576 fstypelen = 0; 577 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 578 if (error || fstype[fstypelen - 1] != '\0') { 579 error = EINVAL; 580 if (errmsg != NULL) 581 strncpy(errmsg, "Invalid fstype", errmsg_len); 582 goto bail; 583 } 584 fspathlen = 0; 585 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 586 if (error || fspath[fspathlen - 1] != '\0') { 587 error = EINVAL; 588 if (errmsg != NULL) 589 strncpy(errmsg, "Invalid fspath", errmsg_len); 590 goto bail; 591 } 592 593 /* 594 * We need to see if we have the "update" option 595 * before we call vfs_domount(), since vfs_domount() has special 596 * logic based on MNT_UPDATE. This is very important 597 * when we want to update the root filesystem. 598 */ 599 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) { 600 if (strcmp(opt->name, "update") == 0) { 601 fsflags |= MNT_UPDATE; 602 vfs_freeopt(optlist, opt); 603 } 604 else if (strcmp(opt->name, "async") == 0) 605 fsflags |= MNT_ASYNC; 606 else if (strcmp(opt->name, "force") == 0) { 607 fsflags |= MNT_FORCE; 608 vfs_freeopt(optlist, opt); 609 } 610 else if (strcmp(opt->name, "reload") == 0) { 611 fsflags |= MNT_RELOAD; 612 vfs_freeopt(optlist, opt); 613 } 614 else if (strcmp(opt->name, "multilabel") == 0) 615 fsflags |= MNT_MULTILABEL; 616 else if (strcmp(opt->name, "noasync") == 0) 617 fsflags &= ~MNT_ASYNC; 618 else if (strcmp(opt->name, "noatime") == 0) 619 fsflags |= MNT_NOATIME; 620 else if (strcmp(opt->name, "atime") == 0) { 621 free(opt->name, M_MOUNT); 622 opt->name = strdup("nonoatime", M_MOUNT); 623 } 624 else if (strcmp(opt->name, "noclusterr") == 0) 625 fsflags |= MNT_NOCLUSTERR; 626 else if (strcmp(opt->name, "clusterr") == 0) { 627 free(opt->name, M_MOUNT); 628 opt->name = strdup("nonoclusterr", M_MOUNT); 629 } 630 else if (strcmp(opt->name, "noclusterw") == 0) 631 fsflags |= MNT_NOCLUSTERW; 632 else if (strcmp(opt->name, "clusterw") == 0) { 633 free(opt->name, M_MOUNT); 634 opt->name = strdup("nonoclusterw", M_MOUNT); 635 } 636 else if (strcmp(opt->name, "noexec") == 0) 637 fsflags |= MNT_NOEXEC; 638 else if (strcmp(opt->name, "exec") == 0) { 639 free(opt->name, M_MOUNT); 640 opt->name = strdup("nonoexec", M_MOUNT); 641 } 642 else if (strcmp(opt->name, "nosuid") == 0) 643 fsflags |= MNT_NOSUID; 644 else if (strcmp(opt->name, "suid") == 0) { 645 free(opt->name, M_MOUNT); 646 opt->name = strdup("nonosuid", M_MOUNT); 647 } 648 else if (strcmp(opt->name, "nosymfollow") == 0) 649 fsflags |= MNT_NOSYMFOLLOW; 650 else if (strcmp(opt->name, "symfollow") == 0) { 651 free(opt->name, M_MOUNT); 652 opt->name = strdup("nonosymfollow", M_MOUNT); 653 } 654 else if (strcmp(opt->name, "noro") == 0) { 655 fsflags &= ~MNT_RDONLY; 656 has_noro = 1; 657 } 658 else if (strcmp(opt->name, "rw") == 0) { 659 fsflags &= ~MNT_RDONLY; 660 has_rw = 1; 661 } 662 else if (strcmp(opt->name, "ro") == 0) 663 fsflags |= MNT_RDONLY; 664 else if (strcmp(opt->name, "rdonly") == 0) { 665 free(opt->name, M_MOUNT); 666 opt->name = strdup("ro", M_MOUNT); 667 fsflags |= MNT_RDONLY; 668 } 669 else if (strcmp(opt->name, "suiddir") == 0) 670 fsflags |= MNT_SUIDDIR; 671 else if (strcmp(opt->name, "sync") == 0) 672 fsflags |= MNT_SYNCHRONOUS; 673 else if (strcmp(opt->name, "union") == 0) 674 fsflags |= MNT_UNION; 675 } 676 677 /* 678 * If "rw" was specified as a mount option, and we 679 * are trying to update a mount-point from "ro" to "rw", 680 * we need a mount option "noro", since in vfs_mergeopts(), 681 * "noro" will cancel "ro", but "rw" will not do anything. 682 */ 683 if (has_rw && !has_noro) { 684 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 685 noro_opt->name = strdup("noro", M_MOUNT); 686 noro_opt->value = NULL; 687 noro_opt->len = 0; 688 noro_opt->pos = -1; 689 noro_opt->seen = 1; 690 TAILQ_INSERT_TAIL(optlist, noro_opt, link); 691 } 692 693 /* 694 * Be ultra-paranoid about making sure the type and fspath 695 * variables will fit in our mp buffers, including the 696 * terminating NUL. 697 */ 698 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 699 error = ENAMETOOLONG; 700 goto bail; 701 } 702 703 mtx_lock(&Giant); 704 error = vfs_domount(td, fstype, fspath, fsflags, optlist); 705 mtx_unlock(&Giant); 706 bail: 707 /* copyout the errmsg */ 708 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt) 709 && errmsg_len > 0 && errmsg != NULL) { 710 if (fsoptions->uio_segflg == UIO_SYSSPACE) { 711 bcopy(errmsg, 712 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 713 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 714 } else { 715 copyout(errmsg, 716 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base, 717 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len); 718 } 719 } 720 721 if (error != 0) 722 vfs_freeopts(optlist); 723 return (error); 724 } 725 726 /* 727 * Old mount API. 728 */ 729 #ifndef _SYS_SYSPROTO_H_ 730 struct mount_args { 731 char *type; 732 char *path; 733 int flags; 734 caddr_t data; 735 }; 736 #endif 737 /* ARGSUSED */ 738 int 739 mount(td, uap) 740 struct thread *td; 741 struct mount_args /* { 742 char *type; 743 char *path; 744 int flags; 745 caddr_t data; 746 } */ *uap; 747 { 748 char *fstype; 749 struct vfsconf *vfsp = NULL; 750 struct mntarg *ma = NULL; 751 int error; 752 753 AUDIT_ARG_FFLAGS(uap->flags); 754 755 /* 756 * Filter out MNT_ROOTFS. We do not want clients of mount() in 757 * userspace to set this flag, but we must filter it out if we want 758 * MNT_UPDATE on the root file system to work. 759 * MNT_ROOTFS should only be set in the kernel in vfs_mountroot_try(). 760 */ 761 uap->flags &= ~MNT_ROOTFS; 762 763 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 764 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 765 if (error) { 766 free(fstype, M_TEMP); 767 return (error); 768 } 769 770 AUDIT_ARG_TEXT(fstype); 771 mtx_lock(&Giant); 772 vfsp = vfs_byname_kld(fstype, td, &error); 773 free(fstype, M_TEMP); 774 if (vfsp == NULL) { 775 mtx_unlock(&Giant); 776 return (ENOENT); 777 } 778 if (vfsp->vfc_vfsops->vfs_cmount == NULL) { 779 mtx_unlock(&Giant); 780 return (EOPNOTSUPP); 781 } 782 783 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 784 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 785 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 786 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 787 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 788 789 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags); 790 mtx_unlock(&Giant); 791 return (error); 792 } 793 794 795 /* 796 * vfs_domount(): actually attempt a filesystem mount. 797 */ 798 static int 799 vfs_domount( 800 struct thread *td, /* Calling thread. */ 801 const char *fstype, /* Filesystem type. */ 802 char *fspath, /* Mount path. */ 803 int fsflags, /* Flags common to all filesystems. */ 804 void *fsdata /* Options local to the filesystem. */ 805 ) 806 { 807 struct vnode *vp; 808 struct mount *mp; 809 struct vfsconf *vfsp; 810 struct oexport_args oexport; 811 struct export_args export; 812 int error, flag = 0; 813 struct vattr va; 814 struct nameidata nd; 815 816 mtx_assert(&Giant, MA_OWNED); 817 /* 818 * Be ultra-paranoid about making sure the type and fspath 819 * variables will fit in our mp buffers, including the 820 * terminating NUL. 821 */ 822 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 823 return (ENAMETOOLONG); 824 825 if (jailed(td->td_ucred) || usermount == 0) { 826 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0) 827 return (error); 828 } 829 830 /* 831 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 832 */ 833 if (fsflags & MNT_EXPORTED) { 834 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED); 835 if (error) 836 return (error); 837 } 838 if (fsflags & MNT_SUIDDIR) { 839 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR); 840 if (error) 841 return (error); 842 } 843 /* 844 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users. 845 */ 846 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) { 847 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0) 848 fsflags |= MNT_NOSUID | MNT_USER; 849 } 850 851 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 852 vfsp = NULL; 853 if ((fsflags & MNT_UPDATE) == 0) { 854 /* Don't try to load KLDs if we're mounting the root. */ 855 if (fsflags & MNT_ROOTFS) 856 vfsp = vfs_byname(fstype); 857 else 858 vfsp = vfs_byname_kld(fstype, td, &error); 859 if (vfsp == NULL) 860 return (ENODEV); 861 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL)) 862 return (EPERM); 863 } 864 /* 865 * Get vnode to be covered 866 */ 867 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, 868 fspath, td); 869 if ((error = namei(&nd)) != 0) 870 return (error); 871 NDFREE(&nd, NDF_ONLY_PNBUF); 872 vp = nd.ni_vp; 873 if (fsflags & MNT_UPDATE) { 874 if ((vp->v_vflag & VV_ROOT) == 0) { 875 vput(vp); 876 return (EINVAL); 877 } 878 mp = vp->v_mount; 879 MNT_ILOCK(mp); 880 flag = mp->mnt_flag; 881 /* 882 * We only allow the filesystem to be reloaded if it 883 * is currently mounted read-only. 884 */ 885 if ((fsflags & MNT_RELOAD) && 886 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 887 MNT_IUNLOCK(mp); 888 vput(vp); 889 return (EOPNOTSUPP); /* Needs translation */ 890 } 891 MNT_IUNLOCK(mp); 892 /* 893 * Only privileged root, or (if MNT_USER is set) the user that 894 * did the original mount is permitted to update it. 895 */ 896 error = vfs_suser(mp, td); 897 if (error) { 898 vput(vp); 899 return (error); 900 } 901 if (vfs_busy(mp, MBF_NOWAIT)) { 902 vput(vp); 903 return (EBUSY); 904 } 905 VI_LOCK(vp); 906 if ((vp->v_iflag & VI_MOUNT) != 0 || 907 vp->v_mountedhere != NULL) { 908 VI_UNLOCK(vp); 909 vfs_unbusy(mp); 910 vput(vp); 911 return (EBUSY); 912 } 913 vp->v_iflag |= VI_MOUNT; 914 VI_UNLOCK(vp); 915 MNT_ILOCK(mp); 916 mp->mnt_flag |= fsflags & 917 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS); 918 MNT_IUNLOCK(mp); 919 VOP_UNLOCK(vp, 0); 920 mp->mnt_optnew = fsdata; 921 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 922 } else { 923 /* 924 * If the user is not root, ensure that they own the directory 925 * onto which we are attempting to mount. 926 */ 927 error = VOP_GETATTR(vp, &va, td->td_ucred); 928 if (error) { 929 vput(vp); 930 return (error); 931 } 932 if (va.va_uid != td->td_ucred->cr_uid) { 933 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 934 0); 935 if (error) { 936 vput(vp); 937 return (error); 938 } 939 } 940 error = vinvalbuf(vp, V_SAVE, 0, 0); 941 if (error != 0) { 942 vput(vp); 943 return (error); 944 } 945 if (vp->v_type != VDIR) { 946 vput(vp); 947 return (ENOTDIR); 948 } 949 VI_LOCK(vp); 950 if ((vp->v_iflag & VI_MOUNT) != 0 || 951 vp->v_mountedhere != NULL) { 952 VI_UNLOCK(vp); 953 vput(vp); 954 return (EBUSY); 955 } 956 vp->v_iflag |= VI_MOUNT; 957 VI_UNLOCK(vp); 958 959 /* 960 * Allocate and initialize the filesystem. 961 */ 962 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred); 963 VOP_UNLOCK(vp, 0); 964 965 /* XXXMAC: pass to vfs_mount_alloc? */ 966 mp->mnt_optnew = fsdata; 967 } 968 969 /* 970 * Set the mount level flags. 971 */ 972 MNT_ILOCK(mp); 973 mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) | 974 (fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS | 975 MNT_RDONLY)); 976 if ((mp->mnt_flag & MNT_ASYNC) == 0) 977 mp->mnt_kern_flag &= ~MNTK_ASYNC; 978 MNT_IUNLOCK(mp); 979 /* 980 * Mount the filesystem. 981 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 982 * get. No freeing of cn_pnbuf. 983 */ 984 error = VFS_MOUNT(mp); 985 986 /* 987 * Process the export option only if we are 988 * updating mount options. 989 */ 990 if (!error && (fsflags & MNT_UPDATE)) { 991 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 992 sizeof(export)) == 0) 993 error = vfs_export(mp, &export); 994 else if (vfs_copyopt(mp->mnt_optnew, "export", &oexport, 995 sizeof(oexport)) == 0) { 996 export.ex_flags = oexport.ex_flags; 997 export.ex_root = oexport.ex_root; 998 export.ex_anon = oexport.ex_anon; 999 export.ex_addr = oexport.ex_addr; 1000 export.ex_addrlen = oexport.ex_addrlen; 1001 export.ex_mask = oexport.ex_mask; 1002 export.ex_masklen = oexport.ex_masklen; 1003 export.ex_indexfile = oexport.ex_indexfile; 1004 export.ex_numsecflavors = 0; 1005 error = vfs_export(mp, &export); 1006 } 1007 } 1008 1009 if (!error) { 1010 if (mp->mnt_opt != NULL) 1011 vfs_freeopts(mp->mnt_opt); 1012 mp->mnt_opt = mp->mnt_optnew; 1013 (void)VFS_STATFS(mp, &mp->mnt_stat); 1014 } 1015 /* 1016 * Prevent external consumers of mount options from reading 1017 * mnt_optnew. 1018 */ 1019 mp->mnt_optnew = NULL; 1020 if (mp->mnt_flag & MNT_UPDATE) { 1021 MNT_ILOCK(mp); 1022 if (error) 1023 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | 1024 (flag & ~MNT_QUOTA); 1025 else 1026 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | 1027 MNT_FORCE | MNT_SNAPSHOT); 1028 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1029 mp->mnt_kern_flag |= MNTK_ASYNC; 1030 else 1031 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1032 MNT_IUNLOCK(mp); 1033 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1034 if (mp->mnt_syncer == NULL) 1035 error = vfs_allocate_syncvnode(mp); 1036 } else { 1037 if (mp->mnt_syncer != NULL) 1038 vrele(mp->mnt_syncer); 1039 mp->mnt_syncer = NULL; 1040 } 1041 vfs_unbusy(mp); 1042 VI_LOCK(vp); 1043 vp->v_iflag &= ~VI_MOUNT; 1044 VI_UNLOCK(vp); 1045 vrele(vp); 1046 return (error); 1047 } 1048 MNT_ILOCK(mp); 1049 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1050 mp->mnt_kern_flag |= MNTK_ASYNC; 1051 else 1052 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1053 MNT_IUNLOCK(mp); 1054 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1055 /* 1056 * Put the new filesystem on the mount list after root. 1057 */ 1058 cache_purge(vp); 1059 if (!error) { 1060 struct vnode *newdp; 1061 1062 VI_LOCK(vp); 1063 vp->v_iflag &= ~VI_MOUNT; 1064 VI_UNLOCK(vp); 1065 vp->v_mountedhere = mp; 1066 mtx_lock(&mountlist_mtx); 1067 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1068 mtx_unlock(&mountlist_mtx); 1069 vfs_event_signal(NULL, VQ_MOUNT, 0); 1070 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp)) 1071 panic("mount: lost mount"); 1072 VOP_UNLOCK(newdp, 0); 1073 VOP_UNLOCK(vp, 0); 1074 mountcheckdirs(vp, newdp); 1075 vrele(newdp); 1076 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1077 error = vfs_allocate_syncvnode(mp); 1078 vfs_unbusy(mp); 1079 if (error) 1080 vrele(vp); 1081 } else { 1082 VI_LOCK(vp); 1083 vp->v_iflag &= ~VI_MOUNT; 1084 VI_UNLOCK(vp); 1085 vfs_unbusy(mp); 1086 vfs_mount_destroy(mp); 1087 vput(vp); 1088 } 1089 return (error); 1090 } 1091 1092 /* 1093 * Unmount a filesystem. 1094 * 1095 * Note: unmount takes a path to the vnode mounted on as argument, not 1096 * special file (as before). 1097 */ 1098 #ifndef _SYS_SYSPROTO_H_ 1099 struct unmount_args { 1100 char *path; 1101 int flags; 1102 }; 1103 #endif 1104 /* ARGSUSED */ 1105 int 1106 unmount(td, uap) 1107 struct thread *td; 1108 register struct unmount_args /* { 1109 char *path; 1110 int flags; 1111 } */ *uap; 1112 { 1113 struct mount *mp; 1114 char *pathbuf; 1115 int error, id0, id1; 1116 1117 AUDIT_ARG_VALUE(uap->flags); 1118 if (jailed(td->td_ucred) || usermount == 0) { 1119 error = priv_check(td, PRIV_VFS_UNMOUNT); 1120 if (error) 1121 return (error); 1122 } 1123 1124 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1125 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1126 if (error) { 1127 free(pathbuf, M_TEMP); 1128 return (error); 1129 } 1130 mtx_lock(&Giant); 1131 if (uap->flags & MNT_BYFSID) { 1132 AUDIT_ARG_TEXT(pathbuf); 1133 /* Decode the filesystem ID. */ 1134 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1135 mtx_unlock(&Giant); 1136 free(pathbuf, M_TEMP); 1137 return (EINVAL); 1138 } 1139 1140 mtx_lock(&mountlist_mtx); 1141 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1142 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1143 mp->mnt_stat.f_fsid.val[1] == id1) 1144 break; 1145 } 1146 mtx_unlock(&mountlist_mtx); 1147 } else { 1148 AUDIT_ARG_UPATH1(td, pathbuf); 1149 mtx_lock(&mountlist_mtx); 1150 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1151 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1152 break; 1153 } 1154 mtx_unlock(&mountlist_mtx); 1155 } 1156 free(pathbuf, M_TEMP); 1157 if (mp == NULL) { 1158 /* 1159 * Previously we returned ENOENT for a nonexistent path and 1160 * EINVAL for a non-mountpoint. We cannot tell these apart 1161 * now, so in the !MNT_BYFSID case return the more likely 1162 * EINVAL for compatibility. 1163 */ 1164 mtx_unlock(&Giant); 1165 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1166 } 1167 1168 /* 1169 * Don't allow unmounting the root filesystem. 1170 */ 1171 if (mp->mnt_flag & MNT_ROOTFS) { 1172 mtx_unlock(&Giant); 1173 return (EINVAL); 1174 } 1175 error = dounmount(mp, uap->flags, td); 1176 mtx_unlock(&Giant); 1177 return (error); 1178 } 1179 1180 /* 1181 * Do the actual filesystem unmount. 1182 */ 1183 int 1184 dounmount(mp, flags, td) 1185 struct mount *mp; 1186 int flags; 1187 struct thread *td; 1188 { 1189 struct vnode *coveredvp, *fsrootvp; 1190 int error; 1191 int async_flag; 1192 int mnt_gen_r; 1193 1194 mtx_assert(&Giant, MA_OWNED); 1195 1196 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1197 mnt_gen_r = mp->mnt_gen; 1198 VI_LOCK(coveredvp); 1199 vholdl(coveredvp); 1200 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY); 1201 vdrop(coveredvp); 1202 /* 1203 * Check for mp being unmounted while waiting for the 1204 * covered vnode lock. 1205 */ 1206 if (coveredvp->v_mountedhere != mp || 1207 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1208 VOP_UNLOCK(coveredvp, 0); 1209 return (EBUSY); 1210 } 1211 } 1212 /* 1213 * Only privileged root, or (if MNT_USER is set) the user that did the 1214 * original mount is permitted to unmount this filesystem. 1215 */ 1216 error = vfs_suser(mp, td); 1217 if (error) { 1218 if (coveredvp) 1219 VOP_UNLOCK(coveredvp, 0); 1220 return (error); 1221 } 1222 1223 MNT_ILOCK(mp); 1224 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1225 MNT_IUNLOCK(mp); 1226 if (coveredvp) 1227 VOP_UNLOCK(coveredvp, 0); 1228 return (EBUSY); 1229 } 1230 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ; 1231 /* Allow filesystems to detect that a forced unmount is in progress. */ 1232 if (flags & MNT_FORCE) 1233 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1234 error = 0; 1235 if (mp->mnt_lockref) { 1236 if ((flags & MNT_FORCE) == 0) { 1237 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_NOINSMNTQ | 1238 MNTK_UNMOUNTF); 1239 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1240 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1241 wakeup(mp); 1242 } 1243 MNT_IUNLOCK(mp); 1244 if (coveredvp) 1245 VOP_UNLOCK(coveredvp, 0); 1246 return (EBUSY); 1247 } 1248 mp->mnt_kern_flag |= MNTK_DRAINING; 1249 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS, 1250 "mount drain", 0); 1251 } 1252 MNT_IUNLOCK(mp); 1253 KASSERT(mp->mnt_lockref == 0, 1254 ("%s: invalid lock refcount in the drain path @ %s:%d", 1255 __func__, __FILE__, __LINE__)); 1256 KASSERT(error == 0, 1257 ("%s: invalid return value for msleep in the drain path @ %s:%d", 1258 __func__, __FILE__, __LINE__)); 1259 vn_start_write(NULL, &mp, V_WAIT); 1260 1261 if (mp->mnt_flag & MNT_EXPUBLIC) 1262 vfs_setpublicfs(NULL, NULL, NULL); 1263 1264 vfs_msync(mp, MNT_WAIT); 1265 MNT_ILOCK(mp); 1266 async_flag = mp->mnt_flag & MNT_ASYNC; 1267 mp->mnt_flag &= ~MNT_ASYNC; 1268 mp->mnt_kern_flag &= ~MNTK_ASYNC; 1269 MNT_IUNLOCK(mp); 1270 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1271 if (mp->mnt_syncer != NULL) 1272 vrele(mp->mnt_syncer); 1273 /* 1274 * For forced unmounts, move process cdir/rdir refs on the fs root 1275 * vnode to the covered vnode. For non-forced unmounts we want 1276 * such references to cause an EBUSY error. 1277 */ 1278 if ((flags & MNT_FORCE) && 1279 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1280 if (mp->mnt_vnodecovered != NULL) 1281 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1282 if (fsrootvp == rootvnode) { 1283 vrele(rootvnode); 1284 rootvnode = NULL; 1285 } 1286 vput(fsrootvp); 1287 } 1288 if (((mp->mnt_flag & MNT_RDONLY) || 1289 (error = VFS_SYNC(mp, MNT_WAIT)) == 0) || (flags & MNT_FORCE) != 0) 1290 error = VFS_UNMOUNT(mp, flags); 1291 vn_finished_write(mp); 1292 /* 1293 * If we failed to flush the dirty blocks for this mount point, 1294 * undo all the cdir/rdir and rootvnode changes we made above. 1295 * Unless we failed to do so because the device is reporting that 1296 * it doesn't exist anymore. 1297 */ 1298 if (error && error != ENXIO) { 1299 if ((flags & MNT_FORCE) && 1300 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) { 1301 if (mp->mnt_vnodecovered != NULL) 1302 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1303 if (rootvnode == NULL) { 1304 rootvnode = fsrootvp; 1305 vref(rootvnode); 1306 } 1307 vput(fsrootvp); 1308 } 1309 MNT_ILOCK(mp); 1310 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ; 1311 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) { 1312 MNT_IUNLOCK(mp); 1313 (void) vfs_allocate_syncvnode(mp); 1314 MNT_ILOCK(mp); 1315 } 1316 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1317 mp->mnt_flag |= async_flag; 1318 if ((mp->mnt_flag & MNT_ASYNC) != 0 && mp->mnt_noasync == 0) 1319 mp->mnt_kern_flag |= MNTK_ASYNC; 1320 if (mp->mnt_kern_flag & MNTK_MWAIT) { 1321 mp->mnt_kern_flag &= ~MNTK_MWAIT; 1322 wakeup(mp); 1323 } 1324 MNT_IUNLOCK(mp); 1325 if (coveredvp) 1326 VOP_UNLOCK(coveredvp, 0); 1327 return (error); 1328 } 1329 mtx_lock(&mountlist_mtx); 1330 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1331 mtx_unlock(&mountlist_mtx); 1332 if (coveredvp != NULL) { 1333 coveredvp->v_mountedhere = NULL; 1334 vput(coveredvp); 1335 } 1336 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1337 vfs_mount_destroy(mp); 1338 return (0); 1339 } 1340 1341 /* 1342 * --------------------------------------------------------------------- 1343 * Mounting of root filesystem 1344 * 1345 */ 1346 1347 struct root_hold_token { 1348 const char *who; 1349 LIST_ENTRY(root_hold_token) list; 1350 }; 1351 1352 static LIST_HEAD(, root_hold_token) root_holds = 1353 LIST_HEAD_INITIALIZER(&root_holds); 1354 1355 static int root_mount_complete; 1356 1357 /* 1358 * Hold root mount. 1359 */ 1360 struct root_hold_token * 1361 root_mount_hold(const char *identifier) 1362 { 1363 struct root_hold_token *h; 1364 1365 if (root_mounted()) 1366 return (NULL); 1367 1368 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 1369 h->who = identifier; 1370 mtx_lock(&mountlist_mtx); 1371 LIST_INSERT_HEAD(&root_holds, h, list); 1372 mtx_unlock(&mountlist_mtx); 1373 return (h); 1374 } 1375 1376 /* 1377 * Release root mount. 1378 */ 1379 void 1380 root_mount_rel(struct root_hold_token *h) 1381 { 1382 1383 if (h == NULL) 1384 return; 1385 mtx_lock(&mountlist_mtx); 1386 LIST_REMOVE(h, list); 1387 wakeup(&root_holds); 1388 mtx_unlock(&mountlist_mtx); 1389 free(h, M_DEVBUF); 1390 } 1391 1392 /* 1393 * Wait for all subsystems to release root mount. 1394 */ 1395 static void 1396 root_mount_prepare(void) 1397 { 1398 struct root_hold_token *h; 1399 struct timeval lastfail; 1400 int curfail = 0; 1401 1402 for (;;) { 1403 DROP_GIANT(); 1404 g_waitidle(); 1405 PICKUP_GIANT(); 1406 mtx_lock(&mountlist_mtx); 1407 if (LIST_EMPTY(&root_holds)) { 1408 mtx_unlock(&mountlist_mtx); 1409 break; 1410 } 1411 if (ppsratecheck(&lastfail, &curfail, 1)) { 1412 printf("Root mount waiting for:"); 1413 LIST_FOREACH(h, &root_holds, list) 1414 printf(" %s", h->who); 1415 printf("\n"); 1416 } 1417 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 1418 hz); 1419 } 1420 } 1421 1422 /* 1423 * Root was mounted, share the good news. 1424 */ 1425 static void 1426 root_mount_done(void) 1427 { 1428 1429 /* Keep prison0's root in sync with the global rootvnode. */ 1430 mtx_lock(&prison0.pr_mtx); 1431 prison0.pr_root = rootvnode; 1432 vref(prison0.pr_root); 1433 mtx_unlock(&prison0.pr_mtx); 1434 /* 1435 * Use a mutex to prevent the wakeup being missed and waiting for 1436 * an extra 1 second sleep. 1437 */ 1438 mtx_lock(&mountlist_mtx); 1439 root_mount_complete = 1; 1440 wakeup(&root_mount_complete); 1441 mtx_unlock(&mountlist_mtx); 1442 } 1443 1444 /* 1445 * Return true if root is already mounted. 1446 */ 1447 int 1448 root_mounted(void) 1449 { 1450 1451 /* No mutex is acquired here because int stores are atomic. */ 1452 return (root_mount_complete); 1453 } 1454 1455 /* 1456 * Wait until root is mounted. 1457 */ 1458 void 1459 root_mount_wait(void) 1460 { 1461 1462 /* 1463 * Panic on an obvious deadlock - the function can't be called from 1464 * a thread which is doing the whole SYSINIT stuff. 1465 */ 1466 KASSERT(curthread->td_proc->p_pid != 0, 1467 ("root_mount_wait: cannot be called from the swapper thread")); 1468 mtx_lock(&mountlist_mtx); 1469 while (!root_mount_complete) { 1470 msleep(&root_mount_complete, &mountlist_mtx, PZERO, "rootwait", 1471 hz); 1472 } 1473 mtx_unlock(&mountlist_mtx); 1474 } 1475 1476 static void 1477 set_rootvnode() 1478 { 1479 struct proc *p; 1480 1481 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode)) 1482 panic("Cannot find root vnode"); 1483 1484 VOP_UNLOCK(rootvnode, 0); 1485 1486 p = curthread->td_proc; 1487 FILEDESC_XLOCK(p->p_fd); 1488 1489 if (p->p_fd->fd_cdir != NULL) 1490 vrele(p->p_fd->fd_cdir); 1491 p->p_fd->fd_cdir = rootvnode; 1492 VREF(rootvnode); 1493 1494 if (p->p_fd->fd_rdir != NULL) 1495 vrele(p->p_fd->fd_rdir); 1496 p->p_fd->fd_rdir = rootvnode; 1497 VREF(rootvnode); 1498 1499 FILEDESC_XUNLOCK(p->p_fd); 1500 1501 EVENTHANDLER_INVOKE(mountroot); 1502 } 1503 1504 /* 1505 * Mount /devfs as our root filesystem, but do not put it on the mountlist 1506 * yet. Create a /dev -> / symlink so that absolute pathnames will lookup. 1507 */ 1508 1509 static void 1510 devfs_first(void) 1511 { 1512 struct thread *td = curthread; 1513 struct vfsoptlist *opts; 1514 struct vfsconf *vfsp; 1515 struct mount *mp = NULL; 1516 int error; 1517 1518 vfsp = vfs_byname("devfs"); 1519 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 1520 if (vfsp == NULL) 1521 return; 1522 1523 mp = vfs_mount_alloc(NULLVP, vfsp, "/dev", td->td_ucred); 1524 1525 error = VFS_MOUNT(mp); 1526 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 1527 if (error) 1528 return; 1529 1530 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 1531 TAILQ_INIT(opts); 1532 mp->mnt_opt = opts; 1533 1534 mtx_lock(&mountlist_mtx); 1535 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 1536 mtx_unlock(&mountlist_mtx); 1537 1538 set_rootvnode(); 1539 1540 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 1541 if (error) 1542 printf("kern_symlink /dev -> / returns %d\n", error); 1543 } 1544 1545 /* 1546 * Surgically move our devfs to be mounted on /dev. 1547 */ 1548 1549 static void 1550 devfs_fixup(struct thread *td) 1551 { 1552 struct nameidata nd; 1553 int error; 1554 struct vnode *vp, *dvp; 1555 struct mount *mp; 1556 1557 /* Remove our devfs mount from the mountlist and purge the cache */ 1558 mtx_lock(&mountlist_mtx); 1559 mp = TAILQ_FIRST(&mountlist); 1560 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1561 mtx_unlock(&mountlist_mtx); 1562 cache_purgevfs(mp); 1563 1564 VFS_ROOT(mp, LK_EXCLUSIVE, &dvp); 1565 VI_LOCK(dvp); 1566 dvp->v_iflag &= ~VI_MOUNT; 1567 VI_UNLOCK(dvp); 1568 dvp->v_mountedhere = NULL; 1569 1570 /* Set up the real rootvnode, and purge the cache */ 1571 TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL; 1572 set_rootvnode(); 1573 cache_purgevfs(rootvnode->v_mount); 1574 1575 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 1576 error = namei(&nd); 1577 if (error) { 1578 printf("Lookup of /dev for devfs, error: %d\n", error); 1579 return; 1580 } 1581 NDFREE(&nd, NDF_ONLY_PNBUF); 1582 vp = nd.ni_vp; 1583 if (vp->v_type != VDIR) { 1584 vput(vp); 1585 } 1586 error = vinvalbuf(vp, V_SAVE, 0, 0); 1587 if (error) { 1588 vput(vp); 1589 } 1590 cache_purge(vp); 1591 mp->mnt_vnodecovered = vp; 1592 vp->v_mountedhere = mp; 1593 mtx_lock(&mountlist_mtx); 1594 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1595 mtx_unlock(&mountlist_mtx); 1596 VOP_UNLOCK(vp, 0); 1597 vput(dvp); 1598 vfs_unbusy(mp); 1599 1600 /* Unlink the no longer needed /dev/dev -> / symlink */ 1601 kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 1602 } 1603 1604 /* 1605 * Report errors during filesystem mounting. 1606 */ 1607 void 1608 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1609 { 1610 struct vfsoptlist *moptlist = mp->mnt_optnew; 1611 va_list ap; 1612 int error, len; 1613 char *errmsg; 1614 1615 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1616 if (error || errmsg == NULL || len <= 0) 1617 return; 1618 1619 va_start(ap, fmt); 1620 vsnprintf(errmsg, (size_t)len, fmt, ap); 1621 va_end(ap); 1622 } 1623 1624 void 1625 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...) 1626 { 1627 va_list ap; 1628 int error, len; 1629 char *errmsg; 1630 1631 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len); 1632 if (error || errmsg == NULL || len <= 0) 1633 return; 1634 1635 va_start(ap, fmt); 1636 vsnprintf(errmsg, (size_t)len, fmt, ap); 1637 va_end(ap); 1638 } 1639 1640 /* 1641 * Find and mount the root filesystem 1642 */ 1643 void 1644 vfs_mountroot(void) 1645 { 1646 char *cp, *options; 1647 int error, i, asked = 0; 1648 1649 options = NULL; 1650 1651 root_mount_prepare(); 1652 1653 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), 1654 NULL, NULL, mount_init, mount_fini, 1655 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1656 devfs_first(); 1657 1658 /* 1659 * We are booted with instructions to prompt for the root filesystem. 1660 */ 1661 if (boothowto & RB_ASKNAME) { 1662 if (!vfs_mountroot_ask()) 1663 goto mounted; 1664 asked = 1; 1665 } 1666 1667 options = getenv("vfs.root.mountfrom.options"); 1668 1669 /* 1670 * The root filesystem information is compiled in, and we are 1671 * booted with instructions to use it. 1672 */ 1673 if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) { 1674 if (!vfs_mountroot_try(ctrootdevname, options)) 1675 goto mounted; 1676 ctrootdevname = NULL; 1677 } 1678 1679 /* 1680 * We've been given the generic "use CDROM as root" flag. This is 1681 * necessary because one media may be used in many different 1682 * devices, so we need to search for them. 1683 */ 1684 if (boothowto & RB_CDROM) { 1685 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 1686 if (!vfs_mountroot_try(cdrom_rootdevnames[i], options)) 1687 goto mounted; 1688 } 1689 } 1690 1691 /* 1692 * Try to use the value read by the loader from /etc/fstab, or 1693 * supplied via some other means. This is the preferred 1694 * mechanism. 1695 */ 1696 cp = getenv("vfs.root.mountfrom"); 1697 if (cp != NULL) { 1698 error = vfs_mountroot_try(cp, options); 1699 freeenv(cp); 1700 if (!error) 1701 goto mounted; 1702 } 1703 1704 /* 1705 * Try values that may have been computed by code during boot 1706 */ 1707 if (!vfs_mountroot_try(rootdevnames[0], options)) 1708 goto mounted; 1709 if (!vfs_mountroot_try(rootdevnames[1], options)) 1710 goto mounted; 1711 1712 /* 1713 * If we (still) have a compiled-in default, try it. 1714 */ 1715 if (ctrootdevname != NULL) 1716 if (!vfs_mountroot_try(ctrootdevname, options)) 1717 goto mounted; 1718 /* 1719 * Everything so far has failed, prompt on the console if we haven't 1720 * already tried that. 1721 */ 1722 if (!asked) 1723 if (!vfs_mountroot_ask()) 1724 goto mounted; 1725 1726 panic("Root mount failed, startup aborted."); 1727 1728 mounted: 1729 root_mount_done(); 1730 freeenv(options); 1731 } 1732 1733 static struct mntarg * 1734 parse_mountroot_options(struct mntarg *ma, const char *options) 1735 { 1736 char *p; 1737 char *name, *name_arg; 1738 char *val, *val_arg; 1739 char *opts; 1740 1741 if (options == NULL || options[0] == '\0') 1742 return (ma); 1743 1744 p = opts = strdup(options, M_MOUNT); 1745 if (opts == NULL) { 1746 return (ma); 1747 } 1748 1749 while((name = strsep(&p, ",")) != NULL) { 1750 if (name[0] == '\0') 1751 break; 1752 1753 val = strchr(name, '='); 1754 if (val != NULL) { 1755 *val = '\0'; 1756 ++val; 1757 } 1758 if( strcmp(name, "rw") == 0 || 1759 strcmp(name, "noro") == 0) { 1760 /* 1761 * The first time we mount the root file system, 1762 * we need to mount 'ro', so We need to ignore 1763 * 'rw' and 'noro' mount options. 1764 */ 1765 continue; 1766 } 1767 name_arg = strdup(name, M_MOUNT); 1768 val_arg = NULL; 1769 if (val != NULL) 1770 val_arg = strdup(val, M_MOUNT); 1771 1772 ma = mount_arg(ma, name_arg, val_arg, 1773 (val_arg != NULL ? -1 : 0)); 1774 } 1775 free(opts, M_MOUNT); 1776 return (ma); 1777 } 1778 1779 /* 1780 * Mount (mountfrom) as the root filesystem. 1781 */ 1782 static int 1783 vfs_mountroot_try(const char *mountfrom, const char *options) 1784 { 1785 struct mount *mp; 1786 struct mntarg *ma; 1787 char *vfsname, *path; 1788 time_t timebase; 1789 int error; 1790 char patt[32]; 1791 char errmsg[255]; 1792 1793 vfsname = NULL; 1794 path = NULL; 1795 mp = NULL; 1796 ma = NULL; 1797 error = EINVAL; 1798 bzero(errmsg, sizeof(errmsg)); 1799 1800 if (mountfrom == NULL) 1801 return (error); /* don't complain */ 1802 printf("Trying to mount root from %s\n", mountfrom); 1803 1804 /* parse vfs name and path */ 1805 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1806 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 1807 vfsname[0] = path[0] = 0; 1808 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 1809 if (sscanf(mountfrom, patt, vfsname, path) < 1) 1810 goto out; 1811 1812 if (path[0] == '\0') 1813 strcpy(path, ROOTNAME); 1814 1815 ma = mount_arg(ma, "fstype", vfsname, -1); 1816 ma = mount_arg(ma, "fspath", "/", -1); 1817 ma = mount_arg(ma, "from", path, -1); 1818 ma = mount_arg(ma, "errmsg", errmsg, sizeof(errmsg)); 1819 ma = mount_arg(ma, "ro", NULL, 0); 1820 ma = parse_mountroot_options(ma, options); 1821 error = kernel_mount(ma, MNT_ROOTFS); 1822 1823 if (error == 0) { 1824 /* 1825 * We mount devfs prior to mounting the / FS, so the first 1826 * entry will typically be devfs. 1827 */ 1828 mp = TAILQ_FIRST(&mountlist); 1829 KASSERT(mp != NULL, ("%s: mountlist is empty", __func__)); 1830 1831 /* 1832 * Iterate over all currently mounted file systems and use 1833 * the time stamp found to check and/or initialize the RTC. 1834 * Typically devfs has no time stamp and the only other FS 1835 * is the actual / FS. 1836 * Call inittodr() only once and pass it the largest of the 1837 * timestamps we encounter. 1838 */ 1839 timebase = 0; 1840 do { 1841 if (mp->mnt_time > timebase) 1842 timebase = mp->mnt_time; 1843 mp = TAILQ_NEXT(mp, mnt_list); 1844 } while (mp != NULL); 1845 inittodr(timebase); 1846 1847 devfs_fixup(curthread); 1848 } 1849 1850 if (error != 0 ) { 1851 printf("ROOT MOUNT ERROR: %s\n", errmsg); 1852 printf("If you have invalid mount options, reboot, and "); 1853 printf("first try the following from\n"); 1854 printf("the loader prompt:\n\n"); 1855 printf(" set vfs.root.mountfrom.options=rw\n\n"); 1856 printf("and then remove invalid mount options from "); 1857 printf("/etc/fstab.\n\n"); 1858 } 1859 out: 1860 free(path, M_MOUNT); 1861 free(vfsname, M_MOUNT); 1862 return (error); 1863 } 1864 1865 /* 1866 * --------------------------------------------------------------------- 1867 * Interactive root filesystem selection code. 1868 */ 1869 1870 static int 1871 vfs_mountroot_ask(void) 1872 { 1873 char name[128]; 1874 char *mountfrom; 1875 char *options; 1876 1877 for(;;) { 1878 printf("Loader variables:\n"); 1879 printf("vfs.root.mountfrom="); 1880 mountfrom = getenv("vfs.root.mountfrom"); 1881 if (mountfrom != NULL) { 1882 printf("%s", mountfrom); 1883 } 1884 printf("\n"); 1885 printf("vfs.root.mountfrom.options="); 1886 options = getenv("vfs.root.mountfrom.options"); 1887 if (options != NULL) { 1888 printf("%s", options); 1889 } 1890 printf("\n"); 1891 freeenv(mountfrom); 1892 freeenv(options); 1893 printf("\nManual root filesystem specification:\n"); 1894 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 1895 printf(" eg. ufs:/dev/da0s1a\n"); 1896 printf(" eg. cd9660:/dev/acd0\n"); 1897 printf(" This is equivalent to: "); 1898 printf("mount -t cd9660 /dev/acd0 /\n"); 1899 printf("\n"); 1900 printf(" ? List valid disk boot devices\n"); 1901 printf(" <empty line> Abort manual input\n"); 1902 printf("\nmountroot> "); 1903 gets(name, sizeof(name), 1); 1904 if (name[0] == '\0') 1905 return (1); 1906 if (name[0] == '?') { 1907 printf("\nList of GEOM managed disk devices:\n "); 1908 g_dev_print(); 1909 continue; 1910 } 1911 if (!vfs_mountroot_try(name, NULL)) 1912 return (0); 1913 } 1914 } 1915 1916 /* 1917 * --------------------------------------------------------------------- 1918 * Functions for querying mount options/arguments from filesystems. 1919 */ 1920 1921 /* 1922 * Check that no unknown options are given 1923 */ 1924 int 1925 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1926 { 1927 struct vfsopt *opt; 1928 char errmsg[255]; 1929 const char **t, *p, *q; 1930 int ret = 0; 1931 1932 TAILQ_FOREACH(opt, opts, link) { 1933 p = opt->name; 1934 q = NULL; 1935 if (p[0] == 'n' && p[1] == 'o') 1936 q = p + 2; 1937 for(t = global_opts; *t != NULL; t++) { 1938 if (strcmp(*t, p) == 0) 1939 break; 1940 if (q != NULL) { 1941 if (strcmp(*t, q) == 0) 1942 break; 1943 } 1944 } 1945 if (*t != NULL) 1946 continue; 1947 for(t = legal; *t != NULL; t++) { 1948 if (strcmp(*t, p) == 0) 1949 break; 1950 if (q != NULL) { 1951 if (strcmp(*t, q) == 0) 1952 break; 1953 } 1954 } 1955 if (*t != NULL) 1956 continue; 1957 snprintf(errmsg, sizeof(errmsg), 1958 "mount option <%s> is unknown", p); 1959 printf("%s\n", errmsg); 1960 ret = EINVAL; 1961 } 1962 if (ret != 0) { 1963 TAILQ_FOREACH(opt, opts, link) { 1964 if (strcmp(opt->name, "errmsg") == 0) { 1965 strncpy((char *)opt->value, errmsg, opt->len); 1966 } 1967 } 1968 } 1969 return (ret); 1970 } 1971 1972 /* 1973 * Get a mount option by its name. 1974 * 1975 * Return 0 if the option was found, ENOENT otherwise. 1976 * If len is non-NULL it will be filled with the length 1977 * of the option. If buf is non-NULL, it will be filled 1978 * with the address of the option. 1979 */ 1980 int 1981 vfs_getopt(opts, name, buf, len) 1982 struct vfsoptlist *opts; 1983 const char *name; 1984 void **buf; 1985 int *len; 1986 { 1987 struct vfsopt *opt; 1988 1989 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1990 1991 TAILQ_FOREACH(opt, opts, link) { 1992 if (strcmp(name, opt->name) == 0) { 1993 opt->seen = 1; 1994 if (len != NULL) 1995 *len = opt->len; 1996 if (buf != NULL) 1997 *buf = opt->value; 1998 return (0); 1999 } 2000 } 2001 return (ENOENT); 2002 } 2003 2004 int 2005 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 2006 { 2007 struct vfsopt *opt; 2008 2009 if (opts == NULL) 2010 return (-1); 2011 2012 TAILQ_FOREACH(opt, opts, link) { 2013 if (strcmp(name, opt->name) == 0) { 2014 opt->seen = 1; 2015 return (opt->pos); 2016 } 2017 } 2018 return (-1); 2019 } 2020 2021 char * 2022 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 2023 { 2024 struct vfsopt *opt; 2025 2026 *error = 0; 2027 TAILQ_FOREACH(opt, opts, link) { 2028 if (strcmp(name, opt->name) != 0) 2029 continue; 2030 opt->seen = 1; 2031 if (opt->len == 0 || 2032 ((char *)opt->value)[opt->len - 1] != '\0') { 2033 *error = EINVAL; 2034 return (NULL); 2035 } 2036 return (opt->value); 2037 } 2038 *error = ENOENT; 2039 return (NULL); 2040 } 2041 2042 int 2043 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 2044 { 2045 struct vfsopt *opt; 2046 2047 TAILQ_FOREACH(opt, opts, link) { 2048 if (strcmp(name, opt->name) == 0) { 2049 opt->seen = 1; 2050 if (w != NULL) 2051 *w |= val; 2052 return (1); 2053 } 2054 } 2055 if (w != NULL) 2056 *w &= ~val; 2057 return (0); 2058 } 2059 2060 int 2061 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 2062 { 2063 va_list ap; 2064 struct vfsopt *opt; 2065 int ret; 2066 2067 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 2068 2069 TAILQ_FOREACH(opt, opts, link) { 2070 if (strcmp(name, opt->name) != 0) 2071 continue; 2072 opt->seen = 1; 2073 if (opt->len == 0 || opt->value == NULL) 2074 return (0); 2075 if (((char *)opt->value)[opt->len - 1] != '\0') 2076 return (0); 2077 va_start(ap, fmt); 2078 ret = vsscanf(opt->value, fmt, ap); 2079 va_end(ap); 2080 return (ret); 2081 } 2082 return (0); 2083 } 2084 2085 int 2086 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len) 2087 { 2088 struct vfsopt *opt; 2089 2090 TAILQ_FOREACH(opt, opts, link) { 2091 if (strcmp(name, opt->name) != 0) 2092 continue; 2093 opt->seen = 1; 2094 if (opt->value == NULL) 2095 opt->len = len; 2096 else { 2097 if (opt->len != len) 2098 return (EINVAL); 2099 bcopy(value, opt->value, len); 2100 } 2101 return (0); 2102 } 2103 return (ENOENT); 2104 } 2105 2106 int 2107 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len) 2108 { 2109 struct vfsopt *opt; 2110 2111 TAILQ_FOREACH(opt, opts, link) { 2112 if (strcmp(name, opt->name) != 0) 2113 continue; 2114 opt->seen = 1; 2115 if (opt->value == NULL) 2116 opt->len = len; 2117 else { 2118 if (opt->len < len) 2119 return (EINVAL); 2120 opt->len = len; 2121 bcopy(value, opt->value, len); 2122 } 2123 return (0); 2124 } 2125 return (ENOENT); 2126 } 2127 2128 int 2129 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value) 2130 { 2131 struct vfsopt *opt; 2132 2133 TAILQ_FOREACH(opt, opts, link) { 2134 if (strcmp(name, opt->name) != 0) 2135 continue; 2136 opt->seen = 1; 2137 if (opt->value == NULL) 2138 opt->len = strlen(value) + 1; 2139 else if (strlcpy(opt->value, value, opt->len) >= opt->len) 2140 return (EINVAL); 2141 return (0); 2142 } 2143 return (ENOENT); 2144 } 2145 2146 /* 2147 * Find and copy a mount option. 2148 * 2149 * The size of the buffer has to be specified 2150 * in len, if it is not the same length as the 2151 * mount option, EINVAL is returned. 2152 * Returns ENOENT if the option is not found. 2153 */ 2154 int 2155 vfs_copyopt(opts, name, dest, len) 2156 struct vfsoptlist *opts; 2157 const char *name; 2158 void *dest; 2159 int len; 2160 { 2161 struct vfsopt *opt; 2162 2163 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 2164 2165 TAILQ_FOREACH(opt, opts, link) { 2166 if (strcmp(name, opt->name) == 0) { 2167 opt->seen = 1; 2168 if (len != opt->len) 2169 return (EINVAL); 2170 bcopy(opt->value, dest, opt->len); 2171 return (0); 2172 } 2173 } 2174 return (ENOENT); 2175 } 2176 2177 /* 2178 * This is a helper function for filesystems to traverse their 2179 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 2180 */ 2181 2182 struct vnode * 2183 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 2184 { 2185 struct vnode *vp; 2186 2187 mtx_assert(MNT_MTX(mp), MA_OWNED); 2188 2189 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 2190 if ((*mvp)->v_yield++ == 500) { 2191 MNT_IUNLOCK(mp); 2192 (*mvp)->v_yield = 0; 2193 uio_yield(); 2194 MNT_ILOCK(mp); 2195 } 2196 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 2197 while (vp != NULL && vp->v_type == VMARKER) 2198 vp = TAILQ_NEXT(vp, v_nmntvnodes); 2199 2200 /* Check if we are done */ 2201 if (vp == NULL) { 2202 __mnt_vnode_markerfree(mvp, mp); 2203 return (NULL); 2204 } 2205 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 2206 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 2207 return (vp); 2208 } 2209 2210 struct vnode * 2211 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 2212 { 2213 struct vnode *vp; 2214 2215 mtx_assert(MNT_MTX(mp), MA_OWNED); 2216 2217 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 2218 while (vp != NULL && vp->v_type == VMARKER) 2219 vp = TAILQ_NEXT(vp, v_nmntvnodes); 2220 2221 /* Check if we are done */ 2222 if (vp == NULL) { 2223 *mvp = NULL; 2224 return (NULL); 2225 } 2226 MNT_REF(mp); 2227 MNT_IUNLOCK(mp); 2228 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 2229 M_VNODE_MARKER, 2230 M_WAITOK | M_ZERO); 2231 MNT_ILOCK(mp); 2232 (*mvp)->v_type = VMARKER; 2233 2234 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 2235 while (vp != NULL && vp->v_type == VMARKER) 2236 vp = TAILQ_NEXT(vp, v_nmntvnodes); 2237 2238 /* Check if we are done */ 2239 if (vp == NULL) { 2240 MNT_IUNLOCK(mp); 2241 free(*mvp, M_VNODE_MARKER); 2242 MNT_ILOCK(mp); 2243 *mvp = NULL; 2244 MNT_REL(mp); 2245 return (NULL); 2246 } 2247 (*mvp)->v_mount = mp; 2248 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 2249 return (vp); 2250 } 2251 2252 2253 void 2254 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 2255 { 2256 2257 if (*mvp == NULL) 2258 return; 2259 2260 mtx_assert(MNT_MTX(mp), MA_OWNED); 2261 2262 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 2263 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 2264 MNT_IUNLOCK(mp); 2265 free(*mvp, M_VNODE_MARKER); 2266 MNT_ILOCK(mp); 2267 *mvp = NULL; 2268 MNT_REL(mp); 2269 } 2270 2271 2272 int 2273 __vfs_statfs(struct mount *mp, struct statfs *sbp) 2274 { 2275 int error; 2276 2277 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat); 2278 if (sbp != &mp->mnt_stat) 2279 *sbp = mp->mnt_stat; 2280 return (error); 2281 } 2282 2283 void 2284 vfs_mountedfrom(struct mount *mp, const char *from) 2285 { 2286 2287 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 2288 strlcpy(mp->mnt_stat.f_mntfromname, from, 2289 sizeof mp->mnt_stat.f_mntfromname); 2290 } 2291 2292 /* 2293 * --------------------------------------------------------------------- 2294 * This is the api for building mount args and mounting filesystems from 2295 * inside the kernel. 2296 * 2297 * The API works by accumulation of individual args. First error is 2298 * latched. 2299 * 2300 * XXX: should be documented in new manpage kernel_mount(9) 2301 */ 2302 2303 /* A memory allocation which must be freed when we are done */ 2304 struct mntaarg { 2305 SLIST_ENTRY(mntaarg) next; 2306 }; 2307 2308 /* The header for the mount arguments */ 2309 struct mntarg { 2310 struct iovec *v; 2311 int len; 2312 int error; 2313 SLIST_HEAD(, mntaarg) list; 2314 }; 2315 2316 /* 2317 * Add a boolean argument. 2318 * 2319 * flag is the boolean value. 2320 * name must start with "no". 2321 */ 2322 struct mntarg * 2323 mount_argb(struct mntarg *ma, int flag, const char *name) 2324 { 2325 2326 KASSERT(name[0] == 'n' && name[1] == 'o', 2327 ("mount_argb(...,%s): name must start with 'no'", name)); 2328 2329 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 2330 } 2331 2332 /* 2333 * Add an argument printf style 2334 */ 2335 struct mntarg * 2336 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 2337 { 2338 va_list ap; 2339 struct mntaarg *maa; 2340 struct sbuf *sb; 2341 int len; 2342 2343 if (ma == NULL) { 2344 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2345 SLIST_INIT(&ma->list); 2346 } 2347 if (ma->error) 2348 return (ma); 2349 2350 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2351 M_MOUNT, M_WAITOK); 2352 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2353 ma->v[ma->len].iov_len = strlen(name) + 1; 2354 ma->len++; 2355 2356 sb = sbuf_new_auto(); 2357 va_start(ap, fmt); 2358 sbuf_vprintf(sb, fmt, ap); 2359 va_end(ap); 2360 sbuf_finish(sb); 2361 len = sbuf_len(sb) + 1; 2362 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2363 SLIST_INSERT_HEAD(&ma->list, maa, next); 2364 bcopy(sbuf_data(sb), maa + 1, len); 2365 sbuf_delete(sb); 2366 2367 ma->v[ma->len].iov_base = maa + 1; 2368 ma->v[ma->len].iov_len = len; 2369 ma->len++; 2370 2371 return (ma); 2372 } 2373 2374 /* 2375 * Add an argument which is a userland string. 2376 */ 2377 struct mntarg * 2378 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 2379 { 2380 struct mntaarg *maa; 2381 char *tbuf; 2382 2383 if (val == NULL) 2384 return (ma); 2385 if (ma == NULL) { 2386 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2387 SLIST_INIT(&ma->list); 2388 } 2389 if (ma->error) 2390 return (ma); 2391 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2392 SLIST_INSERT_HEAD(&ma->list, maa, next); 2393 tbuf = (void *)(maa + 1); 2394 ma->error = copyinstr(val, tbuf, len, NULL); 2395 return (mount_arg(ma, name, tbuf, -1)); 2396 } 2397 2398 /* 2399 * Plain argument. 2400 * 2401 * If length is -1, treat value as a C string. 2402 */ 2403 struct mntarg * 2404 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 2405 { 2406 2407 if (ma == NULL) { 2408 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2409 SLIST_INIT(&ma->list); 2410 } 2411 if (ma->error) 2412 return (ma); 2413 2414 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2415 M_MOUNT, M_WAITOK); 2416 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2417 ma->v[ma->len].iov_len = strlen(name) + 1; 2418 ma->len++; 2419 2420 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 2421 if (len < 0) 2422 ma->v[ma->len].iov_len = strlen(val) + 1; 2423 else 2424 ma->v[ma->len].iov_len = len; 2425 ma->len++; 2426 return (ma); 2427 } 2428 2429 /* 2430 * Free a mntarg structure 2431 */ 2432 static void 2433 free_mntarg(struct mntarg *ma) 2434 { 2435 struct mntaarg *maa; 2436 2437 while (!SLIST_EMPTY(&ma->list)) { 2438 maa = SLIST_FIRST(&ma->list); 2439 SLIST_REMOVE_HEAD(&ma->list, next); 2440 free(maa, M_MOUNT); 2441 } 2442 free(ma->v, M_MOUNT); 2443 free(ma, M_MOUNT); 2444 } 2445 2446 /* 2447 * Mount a filesystem 2448 */ 2449 int 2450 kernel_mount(struct mntarg *ma, int flags) 2451 { 2452 struct uio auio; 2453 int error; 2454 2455 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2456 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2457 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2458 2459 auio.uio_iov = ma->v; 2460 auio.uio_iovcnt = ma->len; 2461 auio.uio_segflg = UIO_SYSSPACE; 2462 2463 error = ma->error; 2464 if (!error) 2465 error = vfs_donmount(curthread, flags, &auio); 2466 free_mntarg(ma); 2467 return (error); 2468 } 2469 2470 /* 2471 * A printflike function to mount a filesystem. 2472 */ 2473 int 2474 kernel_vmount(int flags, ...) 2475 { 2476 struct mntarg *ma = NULL; 2477 va_list ap; 2478 const char *cp; 2479 const void *vp; 2480 int error; 2481 2482 va_start(ap, flags); 2483 for (;;) { 2484 cp = va_arg(ap, const char *); 2485 if (cp == NULL) 2486 break; 2487 vp = va_arg(ap, const void *); 2488 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0)); 2489 } 2490 va_end(ap); 2491 2492 error = kernel_mount(ma, flags); 2493 return (error); 2494 }
Cache object: d01bc8fbda17bbec9d4ec775ec4c16bc
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