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/6.2/sys/kern/vfs_mount.c 164286 2006-11-14 20:42:41Z cvs2svn $"); 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/libkern.h> 45 #include <sys/mac.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/namei.h> 50 #include <sys/proc.h> 51 #include <sys/filedesc.h> 52 #include <sys/reboot.h> 53 #include <sys/syscallsubr.h> 54 #include <sys/sysproto.h> 55 #include <sys/sx.h> 56 #include <sys/sysctl.h> 57 #include <sys/sysent.h> 58 #include <sys/systm.h> 59 #include <sys/vnode.h> 60 #include <vm/uma.h> 61 62 #include <geom/geom.h> 63 64 #include <machine/stdarg.h> 65 66 #include <security/audit/audit.h> 67 68 #include "opt_rootdevname.h" 69 #include "opt_ddb.h" 70 #include "opt_mac.h" 71 72 #ifdef DDB 73 #include <ddb/ddb.h> 74 #endif 75 76 #define ROOTNAME "root_device" 77 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64) 78 79 static int vfs_domount(struct thread *td, const char *fstype, 80 char *fspath, int fsflags, void *fsdata); 81 static int vfs_mount_alloc(struct vnode *dvp, struct vfsconf *vfsp, 82 const char *fspath, struct thread *td, struct mount **mpp); 83 static int vfs_mountroot_ask(void); 84 static int vfs_mountroot_try(const char *mountfrom); 85 static int vfs_donmount(struct thread *td, int fsflags, 86 struct uio *fsoptions); 87 static void free_mntarg(struct mntarg *ma); 88 static void vfs_mount_destroy(struct mount *); 89 90 static int usermount = 0; 91 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 92 "Unprivileged users may mount and unmount file systems"); 93 94 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 95 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 96 static uma_zone_t mount_zone; 97 98 /* List of mounted filesystems. */ 99 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 100 101 /* For any iteration/modification of mountlist */ 102 struct mtx mountlist_mtx; 103 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 104 105 TAILQ_HEAD(vfsoptlist, vfsopt); 106 struct vfsopt { 107 TAILQ_ENTRY(vfsopt) link; 108 char *name; 109 void *value; 110 int len; 111 }; 112 113 /* 114 * The vnode of the system's root (/ in the filesystem, without chroot 115 * active.) 116 */ 117 struct vnode *rootvnode; 118 119 /* 120 * The root filesystem is detailed in the kernel environment variable 121 * vfs.root.mountfrom, which is expected to be in the general format 122 * 123 * <vfsname>:[<path>] 124 * vfsname := the name of a VFS known to the kernel and capable 125 * of being mounted as root 126 * path := disk device name or other data used by the filesystem 127 * to locate its physical store 128 */ 129 130 /* 131 * Global opts, taken by all filesystems 132 */ 133 static const char *global_opts[] = { 134 "errmsg", 135 "fstype", 136 "fspath", 137 "rdonly", 138 "ro", 139 "rw", 140 "suid", 141 "exec", 142 "update", 143 NULL 144 }; 145 146 /* 147 * The root specifiers we will try if RB_CDROM is specified. 148 */ 149 static char *cdrom_rootdevnames[] = { 150 "cd9660:cd0", 151 "cd9660:acd0", 152 NULL 153 }; 154 155 /* legacy find-root code */ 156 char *rootdevnames[2] = {NULL, NULL}; 157 #ifndef ROOTDEVNAME 158 # define ROOTDEVNAME NULL 159 #endif 160 static const char *ctrootdevname = ROOTDEVNAME; 161 162 /* 163 * --------------------------------------------------------------------- 164 * Functions for building and sanitizing the mount options 165 */ 166 167 /* Remove one mount option. */ 168 static void 169 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 170 { 171 172 TAILQ_REMOVE(opts, opt, link); 173 free(opt->name, M_MOUNT); 174 if (opt->value != NULL) 175 free(opt->value, M_MOUNT); 176 #ifdef INVARIANTS 177 else if (opt->len != 0) 178 panic("%s: mount option with NULL value but length != 0", 179 __func__); 180 #endif 181 free(opt, M_MOUNT); 182 } 183 184 /* Release all resources related to the mount options. */ 185 static void 186 vfs_freeopts(struct vfsoptlist *opts) 187 { 188 struct vfsopt *opt; 189 190 while (!TAILQ_EMPTY(opts)) { 191 opt = TAILQ_FIRST(opts); 192 vfs_freeopt(opts, opt); 193 } 194 free(opts, M_MOUNT); 195 } 196 197 /* 198 * Check if options are equal (with or without the "no" prefix). 199 */ 200 static int 201 vfs_equalopts(const char *opt1, const char *opt2) 202 { 203 204 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 205 if (strcmp(opt1, opt2) == 0) 206 return (1); 207 /* "noopt" vs. "opt" */ 208 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 209 return (1); 210 /* "opt" vs. "noopt" */ 211 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 212 return (1); 213 return (0); 214 } 215 216 /* 217 * If a mount option is specified several times, 218 * (with or without the "no" prefix) only keep 219 * the last occurence of it. 220 */ 221 static void 222 vfs_sanitizeopts(struct vfsoptlist *opts) 223 { 224 struct vfsopt *opt, *opt2, *tmp; 225 226 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 227 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 228 while (opt2 != NULL) { 229 if (vfs_equalopts(opt->name, opt2->name)) { 230 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 231 vfs_freeopt(opts, opt2); 232 opt2 = tmp; 233 } else { 234 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 235 } 236 } 237 } 238 } 239 240 /* 241 * Build a linked list of mount options from a struct uio. 242 */ 243 static int 244 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 245 { 246 struct vfsoptlist *opts; 247 struct vfsopt *opt; 248 size_t memused; 249 unsigned int i, iovcnt; 250 int error, namelen, optlen; 251 252 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 253 TAILQ_INIT(opts); 254 memused = 0; 255 iovcnt = auio->uio_iovcnt; 256 for (i = 0; i < iovcnt; i += 2) { 257 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 258 namelen = auio->uio_iov[i].iov_len; 259 optlen = auio->uio_iov[i + 1].iov_len; 260 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 261 opt->value = NULL; 262 opt->len = 0; 263 264 /* 265 * Do this early, so jumps to "bad" will free the current 266 * option. 267 */ 268 TAILQ_INSERT_TAIL(opts, opt, link); 269 memused += sizeof(struct vfsopt) + optlen + namelen; 270 271 /* 272 * Avoid consuming too much memory, and attempts to overflow 273 * memused. 274 */ 275 if (memused > VFS_MOUNTARG_SIZE_MAX || 276 optlen > VFS_MOUNTARG_SIZE_MAX || 277 namelen > VFS_MOUNTARG_SIZE_MAX) { 278 error = EINVAL; 279 goto bad; 280 } 281 282 if (auio->uio_segflg == UIO_SYSSPACE) { 283 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 284 } else { 285 error = copyin(auio->uio_iov[i].iov_base, opt->name, 286 namelen); 287 if (error) 288 goto bad; 289 } 290 /* Ensure names are null-terminated strings. */ 291 if (opt->name[namelen - 1] != '\0') { 292 error = EINVAL; 293 goto bad; 294 } 295 if (optlen != 0) { 296 opt->len = optlen; 297 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 298 if (auio->uio_segflg == UIO_SYSSPACE) { 299 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 300 optlen); 301 } else { 302 error = copyin(auio->uio_iov[i + 1].iov_base, 303 opt->value, optlen); 304 if (error) 305 goto bad; 306 } 307 } 308 } 309 vfs_sanitizeopts(opts); 310 *options = opts; 311 return (0); 312 bad: 313 vfs_freeopts(opts); 314 return (error); 315 } 316 317 /* 318 * Merge the old mount options with the new ones passed 319 * in the MNT_UPDATE case. 320 */ 321 static void 322 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 323 { 324 struct vfsopt *opt, *opt2, *new; 325 326 TAILQ_FOREACH(opt, opts, link) { 327 /* 328 * Check that this option hasn't been redefined 329 * nor cancelled with a "no" mount option. 330 */ 331 opt2 = TAILQ_FIRST(toopts); 332 while (opt2 != NULL) { 333 if (strcmp(opt2->name, opt->name) == 0) 334 goto next; 335 if (strncmp(opt2->name, "no", 2) == 0 && 336 strcmp(opt2->name + 2, opt->name) == 0) { 337 vfs_freeopt(toopts, opt2); 338 goto next; 339 } 340 opt2 = TAILQ_NEXT(opt2, link); 341 } 342 /* We want this option, duplicate it. */ 343 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 344 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 345 strcpy(new->name, opt->name); 346 if (opt->len != 0) { 347 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 348 bcopy(opt->value, new->value, opt->len); 349 } else { 350 new->value = NULL; 351 } 352 new->len = opt->len; 353 TAILQ_INSERT_TAIL(toopts, new, link); 354 next: 355 continue; 356 } 357 } 358 359 /* 360 * --------------------------------------------------------------------- 361 * Mount a filesystem 362 */ 363 int 364 nmount(td, uap) 365 struct thread *td; 366 struct nmount_args /* { 367 struct iovec *iovp; 368 unsigned int iovcnt; 369 int flags; 370 } */ *uap; 371 { 372 struct uio *auio; 373 struct iovec *iov; 374 unsigned int i; 375 int error; 376 u_int iovcnt; 377 378 AUDIT_ARG(fflags, uap->flags); 379 380 /* Kick out MNT_ROOTFS early as it is legal internally */ 381 if (uap->flags & MNT_ROOTFS) 382 return (EINVAL); 383 384 iovcnt = uap->iovcnt; 385 /* 386 * Check that we have an even number of iovec's 387 * and that we have at least two options. 388 */ 389 if ((iovcnt & 1) || (iovcnt < 4)) 390 return (EINVAL); 391 392 error = copyinuio(uap->iovp, iovcnt, &auio); 393 if (error) 394 return (error); 395 iov = auio->uio_iov; 396 for (i = 0; i < iovcnt; i++) { 397 if (iov->iov_len > MMAXOPTIONLEN) { 398 free(auio, M_IOV); 399 return (EINVAL); 400 } 401 iov++; 402 } 403 error = vfs_donmount(td, uap->flags, auio); 404 free(auio, M_IOV); 405 return (error); 406 } 407 408 /* 409 * --------------------------------------------------------------------- 410 * Various utility functions 411 */ 412 413 void 414 vfs_ref(struct mount *mp) 415 { 416 417 MNT_ILOCK(mp); 418 MNT_REF(mp); 419 MNT_IUNLOCK(mp); 420 } 421 422 void 423 vfs_rel(struct mount *mp) 424 { 425 426 MNT_ILOCK(mp); 427 MNT_REL(mp); 428 MNT_IUNLOCK(mp); 429 } 430 431 static int 432 mount_init(void *mem, int size, int flags) 433 { 434 struct mount *mp; 435 436 mp = (struct mount *)mem; 437 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 438 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 439 return (0); 440 } 441 442 static void 443 mount_fini(void *mem, int size) 444 { 445 struct mount *mp; 446 447 mp = (struct mount *)mem; 448 lockdestroy(&mp->mnt_lock); 449 mtx_destroy(&mp->mnt_mtx); 450 } 451 452 /* 453 * Allocate and initialize the mount point struct. 454 */ 455 static int 456 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, 457 const char *fspath, struct thread *td, struct mount **mpp) 458 { 459 struct mount *mp; 460 461 mp = uma_zalloc(mount_zone, M_WAITOK); 462 bzero(&mp->mnt_startzero, 463 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 464 bzero(&mp->mnt_startzero2, 465 __rangeof(struct mount, mnt_startzero2, mnt_endzero2)); 466 TAILQ_INIT(&mp->mnt_nvnodelist); 467 mp->mnt_nvnodelistsize = 0; 468 mp->mnt_ref = 0; 469 (void) vfs_busy(mp, LK_NOWAIT, 0, td); 470 mp->mnt_op = vfsp->vfc_vfsops; 471 mp->mnt_vfc = vfsp; 472 vfsp->vfc_refcount++; /* XXX Unlocked */ 473 mp->mnt_stat.f_type = vfsp->vfc_typenum; 474 MNT_ILOCK(mp); 475 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 476 MNT_IUNLOCK(mp); 477 mp->mnt_gen++; 478 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 479 mp->mnt_vnodecovered = vp; 480 mp->mnt_cred = crdup(td->td_ucred); 481 mp->mnt_stat.f_owner = td->td_ucred->cr_uid; 482 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 483 mp->mnt_iosize_max = DFLTPHYS; 484 #ifdef MAC 485 mac_init_mount(mp); 486 mac_create_mount(td->td_ucred, mp); 487 #endif 488 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 489 *mpp = mp; 490 return (0); 491 } 492 493 /* 494 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 495 */ 496 static void 497 vfs_mount_destroy(struct mount *mp) 498 { 499 int i; 500 501 MNT_ILOCK(mp); 502 for (i = 0; mp->mnt_ref && i < 3; i++) 503 msleep(mp, MNT_MTX(mp), PVFS, "mntref", hz); 504 /* 505 * This will always cause a 3 second delay in rebooting due to 506 * refs on the root mountpoint that never go away. Most of these 507 * are held by init which never exits. 508 */ 509 if (i == 3 && (!rebooting || bootverbose)) 510 printf("Mount point %s had %d dangling refs\n", 511 mp->mnt_stat.f_mntonname, mp->mnt_ref); 512 if (mp->mnt_holdcnt != 0) { 513 printf("Waiting for mount point to be unheld\n"); 514 while (mp->mnt_holdcnt != 0) { 515 mp->mnt_holdcntwaiters++; 516 msleep(&mp->mnt_holdcnt, MNT_MTX(mp), 517 PZERO, "mntdestroy", 0); 518 mp->mnt_holdcntwaiters--; 519 } 520 printf("mount point unheld\n"); 521 } 522 if (mp->mnt_writeopcount > 0) { 523 printf("Waiting for mount point write ops\n"); 524 while (mp->mnt_writeopcount > 0) { 525 mp->mnt_kern_flag |= MNTK_SUSPEND; 526 msleep(&mp->mnt_writeopcount, 527 MNT_MTX(mp), 528 PZERO, "mntdestroy2", 0); 529 } 530 printf("mount point write ops completed\n"); 531 } 532 if (mp->mnt_secondary_writes > 0) { 533 printf("Waiting for mount point secondary write ops\n"); 534 while (mp->mnt_secondary_writes > 0) { 535 mp->mnt_kern_flag |= MNTK_SUSPEND; 536 msleep(&mp->mnt_secondary_writes, 537 MNT_MTX(mp), 538 PZERO, "mntdestroy3", 0); 539 } 540 printf("mount point secondary write ops completed\n"); 541 } 542 MNT_IUNLOCK(mp); 543 mp->mnt_vfc->vfc_refcount--; 544 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 545 struct vnode *vp; 546 547 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 548 vprint("", vp); 549 panic("unmount: dangling vnode"); 550 } 551 MNT_ILOCK(mp); 552 if (mp->mnt_kern_flag & MNTK_MWAIT) 553 wakeup(mp); 554 if (mp->mnt_writeopcount != 0) 555 panic("vfs_mount_destroy: nonzero writeopcount"); 556 if (mp->mnt_secondary_writes != 0) 557 panic("vfs_mount_destroy: nonzero secondary_writes"); 558 if (mp->mnt_nvnodelistsize != 0) 559 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 560 mp->mnt_writeopcount = -1000; 561 mp->mnt_nvnodelistsize = -1000; 562 mp->mnt_secondary_writes = -1000; 563 MNT_IUNLOCK(mp); 564 #ifdef MAC 565 mac_destroy_mount(mp); 566 #endif 567 if (mp->mnt_opt != NULL) 568 vfs_freeopts(mp->mnt_opt); 569 crfree(mp->mnt_cred); 570 uma_zfree(mount_zone, mp); 571 } 572 573 static int 574 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 575 { 576 struct vfsoptlist *optlist; 577 char *fstype, *fspath; 578 int error, fstypelen, fspathlen; 579 580 error = vfs_buildopts(fsoptions, &optlist); 581 if (error) 582 return (error); 583 584 /* 585 * We need these two options before the others, 586 * and they are mandatory for any filesystem. 587 * Ensure they are NUL terminated as well. 588 */ 589 fstypelen = 0; 590 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 591 if (error || fstype[fstypelen - 1] != '\0') { 592 error = EINVAL; 593 goto bail; 594 } 595 fspathlen = 0; 596 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 597 if (error || fspath[fspathlen - 1] != '\0') { 598 error = EINVAL; 599 goto bail; 600 } 601 602 /* 603 * We need to see if we have the "update" option 604 * before we call vfs_domount(), since vfs_domount() has special 605 * logic based on MNT_UPDATE. This is very important 606 * when we want to update the root filesystem. 607 */ 608 if (vfs_getopt(optlist, "update", NULL, NULL) == 0) 609 fsflags |= MNT_UPDATE; 610 611 if (vfs_getopt(optlist, "async", NULL, NULL) == 0) 612 fsflags |= MNT_ASYNC; 613 614 if (vfs_getopt(optlist, "force", NULL, NULL) == 0) 615 fsflags |= MNT_FORCE; 616 617 if (vfs_getopt(optlist, "multilabel", NULL, NULL) == 0) 618 fsflags |= MNT_MULTILABEL; 619 620 if (vfs_getopt(optlist, "noasync", NULL, NULL) == 0) 621 fsflags &= ~MNT_ASYNC; 622 623 if (vfs_getopt(optlist, "noatime", NULL, NULL) == 0) 624 fsflags |= MNT_NOATIME; 625 626 if (vfs_getopt(optlist, "noclusterr", NULL, NULL) == 0) 627 fsflags |= MNT_NOCLUSTERR; 628 629 if (vfs_getopt(optlist, "noclusterw", NULL, NULL) == 0) 630 fsflags |= MNT_NOCLUSTERW; 631 632 if (vfs_getopt(optlist, "noexec", NULL, NULL) == 0) 633 fsflags |= MNT_NOEXEC; 634 635 if (vfs_getopt(optlist, "nosuid", NULL, NULL) == 0) 636 fsflags |= MNT_NOSUID; 637 638 if (vfs_getopt(optlist, "nosymfollow", NULL, NULL) == 0) 639 fsflags |= MNT_NOSYMFOLLOW; 640 641 if (vfs_getopt(optlist, "noro", NULL, NULL) == 0) 642 fsflags &= ~MNT_RDONLY; 643 644 if (vfs_getopt(optlist, "ro", NULL, NULL) == 0) 645 fsflags |= MNT_RDONLY; 646 647 if (vfs_getopt(optlist, "rdonly", NULL, NULL) == 0) 648 fsflags |= MNT_RDONLY; 649 650 if (vfs_getopt(optlist, "rw", NULL, NULL) == 0) 651 fsflags &= ~MNT_RDONLY; 652 653 if (vfs_getopt(optlist, "snapshot", NULL, NULL) == 0) 654 fsflags |= MNT_SNAPSHOT; 655 656 if (vfs_getopt(optlist, "suiddir", NULL, NULL) == 0) 657 fsflags |= MNT_SUIDDIR; 658 659 if (vfs_getopt(optlist, "sync", NULL, NULL) == 0) 660 fsflags |= MNT_SYNCHRONOUS; 661 662 if (vfs_getopt(optlist, "union", NULL, NULL) == 0) 663 fsflags |= MNT_UNION; 664 665 /* 666 * Be ultra-paranoid about making sure the type and fspath 667 * variables will fit in our mp buffers, including the 668 * terminating NUL. 669 */ 670 if (fstypelen >= MFSNAMELEN - 1 || fspathlen >= MNAMELEN - 1) { 671 error = ENAMETOOLONG; 672 goto bail; 673 } 674 675 mtx_lock(&Giant); 676 error = vfs_domount(td, fstype, fspath, fsflags, optlist); 677 mtx_unlock(&Giant); 678 bail: 679 if (error) 680 vfs_freeopts(optlist); 681 return (error); 682 } 683 684 /* 685 * --------------------------------------------------------------------- 686 * Old mount API. 687 */ 688 #ifndef _SYS_SYSPROTO_H_ 689 struct mount_args { 690 char *type; 691 char *path; 692 int flags; 693 caddr_t data; 694 }; 695 #endif 696 /* ARGSUSED */ 697 int 698 mount(td, uap) 699 struct thread *td; 700 struct mount_args /* { 701 char *type; 702 char *path; 703 int flags; 704 caddr_t data; 705 } */ *uap; 706 { 707 char *fstype; 708 struct vfsconf *vfsp = NULL; 709 struct mntarg *ma = NULL; 710 int error; 711 712 AUDIT_ARG(fflags, uap->flags); 713 714 /* Kick out MNT_ROOTFS early as it is legal internally */ 715 uap->flags &= ~MNT_ROOTFS; 716 717 if (uap->data == NULL) 718 return (EINVAL); 719 720 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 721 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 722 if (!error) { 723 AUDIT_ARG(text, fstype); 724 mtx_lock(&Giant); /* XXX ? */ 725 vfsp = vfs_byname_kld(fstype, td, &error); 726 mtx_unlock(&Giant); 727 } 728 free(fstype, M_TEMP); 729 if (error) 730 return (error); 731 if (vfsp == NULL) 732 return (ENOENT); 733 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 734 return (EOPNOTSUPP); 735 736 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 737 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 738 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 739 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 740 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 741 742 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td); 743 return (error); 744 } 745 746 747 /* 748 * vfs_domount(): actually attempt a filesystem mount. 749 */ 750 static int 751 vfs_domount( 752 struct thread *td, /* Flags common to all filesystems. */ 753 const char *fstype, /* Filesystem type. */ 754 char *fspath, /* Mount path. */ 755 int fsflags, /* Flags common to all filesystems. */ 756 void *fsdata /* Options local to the filesystem. */ 757 ) 758 { 759 struct vnode *vp; 760 struct mount *mp; 761 struct vfsconf *vfsp; 762 struct export_args export; 763 int error, flag = 0; 764 struct vattr va; 765 struct nameidata nd; 766 767 mtx_assert(&Giant, MA_OWNED); 768 /* 769 * Be ultra-paranoid about making sure the type and fspath 770 * variables will fit in our mp buffers, including the 771 * terminating NUL. 772 */ 773 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 774 return (ENAMETOOLONG); 775 776 if (jailed(td->td_ucred)) 777 return (EPERM); 778 if (usermount == 0) { 779 if ((error = suser(td)) != 0) 780 return (error); 781 } 782 783 /* 784 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 785 */ 786 if (fsflags & (MNT_EXPORTED | MNT_SUIDDIR)) { 787 if ((error = suser(td)) != 0) 788 return (error); 789 } 790 /* 791 * Silently enforce MNT_NOSUID and MNT_USER for 792 * unprivileged users. 793 */ 794 if (suser(td) != 0) 795 fsflags |= MNT_NOSUID | MNT_USER; 796 797 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 798 vfsp = NULL; 799 if ((fsflags & MNT_UPDATE) == 0) { 800 /* Don't try to load KLDs if we're mounting the root. */ 801 if (fsflags & MNT_ROOTFS) 802 vfsp = vfs_byname(fstype); 803 else 804 vfsp = vfs_byname_kld(fstype, td, &error); 805 if (vfsp == NULL) 806 return (ENODEV); 807 } 808 /* 809 * Get vnode to be covered 810 */ 811 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, 812 fspath, td); 813 if ((error = namei(&nd)) != 0) 814 return (error); 815 NDFREE(&nd, NDF_ONLY_PNBUF); 816 vp = nd.ni_vp; 817 if (fsflags & MNT_UPDATE) { 818 if ((vp->v_vflag & VV_ROOT) == 0) { 819 vput(vp); 820 return (EINVAL); 821 } 822 mp = vp->v_mount; 823 MNT_ILOCK(mp); 824 flag = mp->mnt_flag; 825 /* 826 * We only allow the filesystem to be reloaded if it 827 * is currently mounted read-only. 828 */ 829 if ((fsflags & MNT_RELOAD) && 830 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 831 MNT_IUNLOCK(mp); 832 vput(vp); 833 return (EOPNOTSUPP); /* Needs translation */ 834 } 835 MNT_IUNLOCK(mp); 836 /* 837 * Only privileged root, or (if MNT_USER is set) the user that 838 * did the original mount is permitted to update it. 839 */ 840 error = vfs_suser(mp, td); 841 if (error) { 842 vput(vp); 843 return (error); 844 } 845 if (vfs_busy(mp, LK_NOWAIT, 0, td)) { 846 vput(vp); 847 return (EBUSY); 848 } 849 VI_LOCK(vp); 850 if ((vp->v_iflag & VI_MOUNT) != 0 || 851 vp->v_mountedhere != NULL) { 852 VI_UNLOCK(vp); 853 vfs_unbusy(mp, td); 854 vput(vp); 855 return (EBUSY); 856 } 857 vp->v_iflag |= VI_MOUNT; 858 VI_UNLOCK(vp); 859 MNT_ILOCK(mp); 860 mp->mnt_flag |= fsflags & 861 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS); 862 MNT_IUNLOCK(mp); 863 VOP_UNLOCK(vp, 0, td); 864 mp->mnt_optnew = fsdata; 865 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 866 } else { 867 /* 868 * If the user is not root, ensure that they own the directory 869 * onto which we are attempting to mount. 870 */ 871 error = VOP_GETATTR(vp, &va, td->td_ucred, td); 872 if (error) { 873 vput(vp); 874 return (error); 875 } 876 if (va.va_uid != td->td_ucred->cr_uid) { 877 if ((error = suser(td)) != 0) { 878 vput(vp); 879 return (error); 880 } 881 } 882 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 883 if (error != 0) { 884 vput(vp); 885 return (error); 886 } 887 if (vp->v_type != VDIR) { 888 vput(vp); 889 return (ENOTDIR); 890 } 891 VI_LOCK(vp); 892 if ((vp->v_iflag & VI_MOUNT) != 0 || 893 vp->v_mountedhere != NULL) { 894 VI_UNLOCK(vp); 895 vput(vp); 896 return (EBUSY); 897 } 898 vp->v_iflag |= VI_MOUNT; 899 VI_UNLOCK(vp); 900 901 /* 902 * Allocate and initialize the filesystem. 903 */ 904 error = vfs_mount_alloc(vp, vfsp, fspath, td, &mp); 905 if (error) { 906 vput(vp); 907 return (error); 908 } 909 VOP_UNLOCK(vp, 0, td); 910 911 /* XXXMAC: pass to vfs_mount_alloc? */ 912 mp->mnt_optnew = fsdata; 913 } 914 915 /* 916 * Set the mount level flags. 917 */ 918 MNT_ILOCK(mp); 919 mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) | 920 (fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS | 921 MNT_RDONLY)); 922 MNT_IUNLOCK(mp); 923 /* 924 * Mount the filesystem. 925 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 926 * get. No freeing of cn_pnbuf. 927 */ 928 error = VFS_MOUNT(mp, td); 929 930 /* 931 * Process the export option only if we are 932 * updating mount options. 933 */ 934 if (!error && (fsflags & MNT_UPDATE)) { 935 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 936 sizeof(export)) == 0) 937 error = vfs_export(mp, &export); 938 } 939 940 if (!error) { 941 if (mp->mnt_opt != NULL) 942 vfs_freeopts(mp->mnt_opt); 943 mp->mnt_opt = mp->mnt_optnew; 944 (void)VFS_STATFS(mp, &mp->mnt_stat, td); 945 } 946 /* 947 * Prevent external consumers of mount options from reading 948 * mnt_optnew. 949 */ 950 mp->mnt_optnew = NULL; 951 if (mp->mnt_flag & MNT_UPDATE) { 952 MNT_ILOCK(mp); 953 if (error) 954 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | 955 (flag & ~MNT_QUOTA); 956 else 957 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | 958 MNT_FORCE | MNT_SNAPSHOT); 959 MNT_IUNLOCK(mp); 960 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 961 if (mp->mnt_syncer == NULL) 962 error = vfs_allocate_syncvnode(mp); 963 } else { 964 if (mp->mnt_syncer != NULL) 965 vrele(mp->mnt_syncer); 966 mp->mnt_syncer = NULL; 967 } 968 vfs_unbusy(mp, td); 969 VI_LOCK(vp); 970 vp->v_iflag &= ~VI_MOUNT; 971 VI_UNLOCK(vp); 972 vrele(vp); 973 return (error); 974 } 975 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 976 /* 977 * Put the new filesystem on the mount list after root. 978 */ 979 cache_purge(vp); 980 if (!error) { 981 struct vnode *newdp; 982 983 VI_LOCK(vp); 984 vp->v_iflag &= ~VI_MOUNT; 985 VI_UNLOCK(vp); 986 vp->v_mountedhere = mp; 987 mtx_lock(&mountlist_mtx); 988 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 989 mtx_unlock(&mountlist_mtx); 990 vfs_event_signal(NULL, VQ_MOUNT, 0); 991 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td)) 992 panic("mount: lost mount"); 993 mountcheckdirs(vp, newdp); 994 vput(newdp); 995 VOP_UNLOCK(vp, 0, td); 996 if ((mp->mnt_flag & MNT_RDONLY) == 0) 997 error = vfs_allocate_syncvnode(mp); 998 vfs_unbusy(mp, td); 999 if (error) 1000 vrele(vp); 1001 } else { 1002 VI_LOCK(vp); 1003 vp->v_iflag &= ~VI_MOUNT; 1004 VI_UNLOCK(vp); 1005 vfs_unbusy(mp, td); 1006 vfs_mount_destroy(mp); 1007 vput(vp); 1008 } 1009 return (error); 1010 } 1011 1012 /* 1013 * --------------------------------------------------------------------- 1014 * Unmount a filesystem. 1015 * 1016 * Note: unmount takes a path to the vnode mounted on as argument, 1017 * not special file (as before). 1018 */ 1019 #ifndef _SYS_SYSPROTO_H_ 1020 struct unmount_args { 1021 char *path; 1022 int flags; 1023 }; 1024 #endif 1025 /* ARGSUSED */ 1026 int 1027 unmount(td, uap) 1028 struct thread *td; 1029 register struct unmount_args /* { 1030 char *path; 1031 int flags; 1032 } */ *uap; 1033 { 1034 struct mount *mp; 1035 char *pathbuf; 1036 int error, id0, id1; 1037 1038 if (jailed(td->td_ucred)) 1039 return (EPERM); 1040 if (usermount == 0) { 1041 if ((error = suser(td)) != 0) 1042 return (error); 1043 } 1044 1045 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1046 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1047 if (error) { 1048 free(pathbuf, M_TEMP); 1049 return (error); 1050 } 1051 AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1); 1052 if (uap->flags & MNT_BYFSID) { 1053 /* Decode the filesystem ID. */ 1054 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1055 free(pathbuf, M_TEMP); 1056 return (EINVAL); 1057 } 1058 1059 mtx_lock(&mountlist_mtx); 1060 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1061 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1062 mp->mnt_stat.f_fsid.val[1] == id1) 1063 break; 1064 } 1065 mtx_unlock(&mountlist_mtx); 1066 } else { 1067 mtx_lock(&mountlist_mtx); 1068 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1069 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1070 break; 1071 } 1072 mtx_unlock(&mountlist_mtx); 1073 } 1074 free(pathbuf, M_TEMP); 1075 if (mp == NULL) { 1076 /* 1077 * Previously we returned ENOENT for a nonexistent path and 1078 * EINVAL for a non-mountpoint. We cannot tell these apart 1079 * now, so in the !MNT_BYFSID case return the more likely 1080 * EINVAL for compatibility. 1081 */ 1082 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1083 } 1084 1085 /* 1086 * Don't allow unmounting the root filesystem. 1087 */ 1088 if (mp->mnt_flag & MNT_ROOTFS) 1089 return (EINVAL); 1090 mtx_lock(&Giant); 1091 error = dounmount(mp, uap->flags, td); 1092 mtx_unlock(&Giant); 1093 return (error); 1094 } 1095 1096 /* 1097 * Do the actual filesystem unmount. 1098 */ 1099 int 1100 dounmount(mp, flags, td) 1101 struct mount *mp; 1102 int flags; 1103 struct thread *td; 1104 { 1105 struct vnode *coveredvp, *fsrootvp; 1106 int error; 1107 int async_flag; 1108 int mnt_gen_r; 1109 1110 mtx_assert(&Giant, MA_OWNED); 1111 1112 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1113 mnt_gen_r = mp->mnt_gen; 1114 VI_LOCK(coveredvp); 1115 vholdl(coveredvp); 1116 error = vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK, td); 1117 vdrop(coveredvp); 1118 /* 1119 * Check for mp being unmounted while waiting for the 1120 * covered vnode lock. 1121 */ 1122 if (error) 1123 return (error); 1124 if (coveredvp->v_mountedhere != mp || 1125 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1126 VOP_UNLOCK(coveredvp, 0, td); 1127 return (EBUSY); 1128 } 1129 } 1130 /* 1131 * Only privileged root, or (if MNT_USER is set) the user that did the 1132 * original mount is permitted to unmount this filesystem. 1133 */ 1134 error = vfs_suser(mp, td); 1135 if (error) { 1136 if (coveredvp) 1137 VOP_UNLOCK(coveredvp, 0, td); 1138 return (error); 1139 } 1140 1141 MNT_ILOCK(mp); 1142 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1143 MNT_IUNLOCK(mp); 1144 if (coveredvp) 1145 VOP_UNLOCK(coveredvp, 0, td); 1146 return (EBUSY); 1147 } 1148 mp->mnt_kern_flag |= MNTK_UNMOUNT; 1149 /* Allow filesystems to detect that a forced unmount is in progress. */ 1150 if (flags & MNT_FORCE) 1151 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1152 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | 1153 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), MNT_MTX(mp), td); 1154 if (error) { 1155 MNT_ILOCK(mp); 1156 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1157 if (mp->mnt_kern_flag & MNTK_MWAIT) 1158 wakeup(mp); 1159 MNT_IUNLOCK(mp); 1160 if (coveredvp) 1161 VOP_UNLOCK(coveredvp, 0, td); 1162 return (error); 1163 } 1164 vn_start_write(NULL, &mp, V_WAIT); 1165 1166 if (mp->mnt_flag & MNT_EXPUBLIC) 1167 vfs_setpublicfs(NULL, NULL, NULL); 1168 1169 vfs_msync(mp, MNT_WAIT); 1170 MNT_ILOCK(mp); 1171 async_flag = mp->mnt_flag & MNT_ASYNC; 1172 mp->mnt_flag &= ~MNT_ASYNC; 1173 MNT_IUNLOCK(mp); 1174 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1175 if (mp->mnt_syncer != NULL) 1176 vrele(mp->mnt_syncer); 1177 /* 1178 * For forced unmounts, move process cdir/rdir refs on the fs root 1179 * vnode to the covered vnode. For non-forced unmounts we want 1180 * such references to cause an EBUSY error. 1181 */ 1182 if ((flags & MNT_FORCE) && 1183 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1184 if (mp->mnt_vnodecovered != NULL) 1185 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1186 if (fsrootvp == rootvnode) { 1187 vrele(rootvnode); 1188 rootvnode = NULL; 1189 } 1190 vput(fsrootvp); 1191 } 1192 if (((mp->mnt_flag & MNT_RDONLY) || 1193 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || 1194 (flags & MNT_FORCE)) { 1195 error = VFS_UNMOUNT(mp, flags, td); 1196 } 1197 vn_finished_write(mp); 1198 if (error) { 1199 /* Undo cdir/rdir and rootvnode changes made above. */ 1200 if ((flags & MNT_FORCE) && 1201 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1202 if (mp->mnt_vnodecovered != NULL) 1203 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1204 if (rootvnode == NULL) { 1205 rootvnode = fsrootvp; 1206 vref(rootvnode); 1207 } 1208 vput(fsrootvp); 1209 } 1210 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 1211 (void) vfs_allocate_syncvnode(mp); 1212 MNT_ILOCK(mp); 1213 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1214 mp->mnt_flag |= async_flag; 1215 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 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 mtx_lock(&mountlist_mtx); 1224 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1225 mtx_unlock(&mountlist_mtx); 1226 if (coveredvp != NULL) { 1227 coveredvp->v_mountedhere = NULL; 1228 vput(coveredvp); 1229 } 1230 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1231 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1232 vfs_mount_destroy(mp); 1233 return (0); 1234 } 1235 1236 /* 1237 * --------------------------------------------------------------------- 1238 * Mounting of root filesystem 1239 * 1240 */ 1241 1242 struct root_hold_token { 1243 const char *who; 1244 LIST_ENTRY(root_hold_token) list; 1245 }; 1246 1247 static LIST_HEAD(, root_hold_token) root_holds = 1248 LIST_HEAD_INITIALIZER(&root_holds); 1249 1250 struct root_hold_token * 1251 root_mount_hold(const char *identifier) 1252 { 1253 struct root_hold_token *h; 1254 1255 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 1256 h->who = identifier; 1257 mtx_lock(&mountlist_mtx); 1258 LIST_INSERT_HEAD(&root_holds, h, list); 1259 mtx_unlock(&mountlist_mtx); 1260 return (h); 1261 } 1262 1263 void 1264 root_mount_rel(struct root_hold_token *h) 1265 { 1266 1267 mtx_lock(&mountlist_mtx); 1268 LIST_REMOVE(h, list); 1269 wakeup(&root_holds); 1270 mtx_unlock(&mountlist_mtx); 1271 free(h, M_DEVBUF); 1272 } 1273 1274 static void 1275 root_mount_wait(void) 1276 { 1277 struct root_hold_token *h; 1278 1279 for (;;) { 1280 DROP_GIANT(); 1281 g_waitidle(); 1282 PICKUP_GIANT(); 1283 mtx_lock(&mountlist_mtx); 1284 if (LIST_EMPTY(&root_holds)) { 1285 mtx_unlock(&mountlist_mtx); 1286 break; 1287 } 1288 printf("Root mount waiting for:"); 1289 LIST_FOREACH(h, &root_holds, list) 1290 printf(" %s", h->who); 1291 printf("\n"); 1292 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 1293 hz); 1294 } 1295 } 1296 1297 static void 1298 set_rootvnode(struct thread *td) 1299 { 1300 struct proc *p; 1301 1302 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td)) 1303 panic("Cannot find root vnode"); 1304 1305 p = td->td_proc; 1306 FILEDESC_LOCK(p->p_fd); 1307 1308 if (p->p_fd->fd_cdir != NULL) 1309 vrele(p->p_fd->fd_cdir); 1310 p->p_fd->fd_cdir = rootvnode; 1311 VREF(rootvnode); 1312 1313 if (p->p_fd->fd_rdir != NULL) 1314 vrele(p->p_fd->fd_rdir); 1315 p->p_fd->fd_rdir = rootvnode; 1316 VREF(rootvnode); 1317 1318 FILEDESC_UNLOCK(p->p_fd); 1319 1320 VOP_UNLOCK(rootvnode, 0, td); 1321 } 1322 1323 /* 1324 * Mount /devfs as our root filesystem, but do not put it on the mountlist 1325 * yet. Create a /dev -> / symlink so that absolute pathnames will lookup. 1326 */ 1327 1328 static void 1329 devfs_first(void) 1330 { 1331 struct thread *td = curthread; 1332 struct vfsoptlist *opts; 1333 struct vfsconf *vfsp; 1334 struct mount *mp = NULL; 1335 int error; 1336 1337 vfsp = vfs_byname("devfs"); 1338 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 1339 if (vfsp == NULL) 1340 return; 1341 1342 error = vfs_mount_alloc(NULLVP, vfsp, "/dev", td, &mp); 1343 KASSERT(error == 0, ("vfs_mount_alloc failed %d", error)); 1344 if (error) 1345 return; 1346 1347 error = VFS_MOUNT(mp, curthread); 1348 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 1349 if (error) 1350 return; 1351 1352 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 1353 TAILQ_INIT(opts); 1354 mp->mnt_opt = opts; 1355 1356 mtx_lock(&mountlist_mtx); 1357 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 1358 mtx_unlock(&mountlist_mtx); 1359 1360 set_rootvnode(td); 1361 1362 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 1363 if (error) 1364 printf("kern_symlink /dev -> / returns %d\n", error); 1365 } 1366 1367 /* 1368 * Surgically move our devfs to be mounted on /dev. 1369 */ 1370 1371 static void 1372 devfs_fixup(struct thread *td) 1373 { 1374 struct nameidata nd; 1375 int error; 1376 struct vnode *vp, *dvp; 1377 struct mount *mp; 1378 1379 /* Remove our devfs mount from the mountlist and purge the cache */ 1380 mtx_lock(&mountlist_mtx); 1381 mp = TAILQ_FIRST(&mountlist); 1382 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1383 mtx_unlock(&mountlist_mtx); 1384 cache_purgevfs(mp); 1385 1386 VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td); 1387 VI_LOCK(dvp); 1388 dvp->v_iflag &= ~VI_MOUNT; 1389 dvp->v_mountedhere = NULL; 1390 VI_UNLOCK(dvp); 1391 1392 /* Set up the real rootvnode, and purge the cache */ 1393 TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL; 1394 set_rootvnode(td); 1395 cache_purgevfs(rootvnode->v_mount); 1396 1397 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 1398 error = namei(&nd); 1399 if (error) { 1400 printf("Lookup of /dev for devfs, error: %d\n", error); 1401 return; 1402 } 1403 NDFREE(&nd, NDF_ONLY_PNBUF); 1404 vp = nd.ni_vp; 1405 if (vp->v_type != VDIR) { 1406 vput(vp); 1407 } 1408 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 1409 if (error) { 1410 vput(vp); 1411 } 1412 cache_purge(vp); 1413 mp->mnt_vnodecovered = vp; 1414 vp->v_mountedhere = mp; 1415 mtx_lock(&mountlist_mtx); 1416 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1417 mtx_unlock(&mountlist_mtx); 1418 VOP_UNLOCK(vp, 0, td); 1419 vput(dvp); 1420 vfs_unbusy(mp, td); 1421 1422 /* Unlink the no longer needed /dev/dev -> / symlink */ 1423 kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 1424 } 1425 1426 /* 1427 * Find and mount the root filesystem 1428 */ 1429 void 1430 vfs_mountroot(void) 1431 { 1432 char *cp; 1433 int error, i, asked = 0; 1434 1435 root_mount_wait(); 1436 1437 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), 1438 NULL, NULL, mount_init, mount_fini, 1439 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1440 devfs_first(); 1441 1442 /* 1443 * We are booted with instructions to prompt for the root filesystem. 1444 */ 1445 if (boothowto & RB_ASKNAME) { 1446 if (!vfs_mountroot_ask()) 1447 return; 1448 asked = 1; 1449 } 1450 1451 /* 1452 * The root filesystem information is compiled in, and we are 1453 * booted with instructions to use it. 1454 */ 1455 if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) { 1456 if (!vfs_mountroot_try(ctrootdevname)) 1457 return; 1458 ctrootdevname = NULL; 1459 } 1460 1461 /* 1462 * We've been given the generic "use CDROM as root" flag. This is 1463 * necessary because one media may be used in many different 1464 * devices, so we need to search for them. 1465 */ 1466 if (boothowto & RB_CDROM) { 1467 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 1468 if (!vfs_mountroot_try(cdrom_rootdevnames[i])) 1469 return; 1470 } 1471 } 1472 1473 /* 1474 * Try to use the value read by the loader from /etc/fstab, or 1475 * supplied via some other means. This is the preferred 1476 * mechanism. 1477 */ 1478 cp = getenv("vfs.root.mountfrom"); 1479 if (cp != NULL) { 1480 error = vfs_mountroot_try(cp); 1481 freeenv(cp); 1482 if (!error) 1483 return; 1484 } 1485 1486 /* 1487 * Try values that may have been computed by code during boot 1488 */ 1489 if (!vfs_mountroot_try(rootdevnames[0])) 1490 return; 1491 if (!vfs_mountroot_try(rootdevnames[1])) 1492 return; 1493 1494 /* 1495 * If we (still) have a compiled-in default, try it. 1496 */ 1497 if (ctrootdevname != NULL) 1498 if (!vfs_mountroot_try(ctrootdevname)) 1499 return; 1500 /* 1501 * Everything so far has failed, prompt on the console if we haven't 1502 * already tried that. 1503 */ 1504 if (!asked) 1505 if (!vfs_mountroot_ask()) 1506 return; 1507 1508 panic("Root mount failed, startup aborted."); 1509 } 1510 1511 /* 1512 * Mount (mountfrom) as the root filesystem. 1513 */ 1514 static int 1515 vfs_mountroot_try(const char *mountfrom) 1516 { 1517 struct mount *mp; 1518 char *vfsname, *path; 1519 time_t timebase; 1520 int error; 1521 char patt[32]; 1522 1523 vfsname = NULL; 1524 path = NULL; 1525 mp = NULL; 1526 error = EINVAL; 1527 1528 if (mountfrom == NULL) 1529 return (error); /* don't complain */ 1530 printf("Trying to mount root from %s\n", mountfrom); 1531 1532 /* parse vfs name and path */ 1533 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1534 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 1535 vfsname[0] = path[0] = 0; 1536 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 1537 if (sscanf(mountfrom, patt, vfsname, path) < 1) 1538 goto out; 1539 1540 if (path[0] == '\0') 1541 strcpy(path, ROOTNAME); 1542 1543 error = kernel_vmount( 1544 MNT_RDONLY | MNT_ROOTFS, 1545 "fstype", vfsname, 1546 "fspath", "/", 1547 "from", path, 1548 NULL); 1549 if (error == 0) { 1550 /* 1551 * We mount devfs prior to mounting the / FS, so the first 1552 * entry will typically be devfs. 1553 */ 1554 mp = TAILQ_FIRST(&mountlist); 1555 KASSERT(mp != NULL, ("%s: mountlist is empty", __func__)); 1556 1557 /* 1558 * Iterate over all currently mounted file systems and use 1559 * the time stamp found to check and/or initialize the RTC. 1560 * Typically devfs has no time stamp and the only other FS 1561 * is the actual / FS. 1562 * Call inittodr() only once and pass it the largest of the 1563 * timestamps we encounter. 1564 */ 1565 timebase = 0; 1566 do { 1567 if (mp->mnt_time > timebase) 1568 timebase = mp->mnt_time; 1569 mp = TAILQ_NEXT(mp, mnt_list); 1570 } while (mp != NULL); 1571 inittodr(timebase); 1572 1573 devfs_fixup(curthread); 1574 } 1575 out: 1576 free(path, M_MOUNT); 1577 free(vfsname, M_MOUNT); 1578 return (error); 1579 } 1580 1581 /* 1582 * --------------------------------------------------------------------- 1583 * Interactive root filesystem selection code. 1584 */ 1585 1586 static int 1587 vfs_mountroot_ask(void) 1588 { 1589 char name[128]; 1590 1591 for(;;) { 1592 printf("\nManual root filesystem specification:\n"); 1593 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 1594 #if defined(__i386__) || defined(__ia64__) 1595 printf(" eg. ufs:da0s1a\n"); 1596 #else 1597 printf(" eg. ufs:/dev/da0a\n"); 1598 #endif 1599 printf(" ? List valid disk boot devices\n"); 1600 printf(" <empty line> Abort manual input\n"); 1601 printf("\nmountroot> "); 1602 gets(name, sizeof(name), 1); 1603 if (name[0] == '\0') 1604 return (1); 1605 if (name[0] == '?') { 1606 printf("\nList of GEOM managed disk devices:\n "); 1607 g_dev_print(); 1608 continue; 1609 } 1610 if (!vfs_mountroot_try(name)) 1611 return (0); 1612 } 1613 } 1614 1615 /* 1616 * --------------------------------------------------------------------- 1617 * Functions for querying mount options/arguments from filesystems. 1618 */ 1619 1620 /* 1621 * Check that no unknown options are given 1622 */ 1623 int 1624 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1625 { 1626 struct vfsopt *opt; 1627 const char **t, *p; 1628 1629 1630 TAILQ_FOREACH(opt, opts, link) { 1631 p = opt->name; 1632 if (p[0] == 'n' && p[1] == 'o') 1633 p += 2; 1634 for(t = global_opts; *t != NULL; t++) 1635 if (!strcmp(*t, p)) 1636 break; 1637 if (*t != NULL) 1638 continue; 1639 for(t = legal; *t != NULL; t++) 1640 if (!strcmp(*t, p)) 1641 break; 1642 if (*t != NULL) 1643 continue; 1644 printf("mount option <%s> is unknown\n", p); 1645 return (EINVAL); 1646 } 1647 return (0); 1648 } 1649 1650 /* 1651 * Get a mount option by its name. 1652 * 1653 * Return 0 if the option was found, ENOENT otherwise. 1654 * If len is non-NULL it will be filled with the length 1655 * of the option. If buf is non-NULL, it will be filled 1656 * with the address of the option. 1657 */ 1658 int 1659 vfs_getopt(opts, name, buf, len) 1660 struct vfsoptlist *opts; 1661 const char *name; 1662 void **buf; 1663 int *len; 1664 { 1665 struct vfsopt *opt; 1666 1667 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1668 1669 TAILQ_FOREACH(opt, opts, link) { 1670 if (strcmp(name, opt->name) == 0) { 1671 if (len != NULL) 1672 *len = opt->len; 1673 if (buf != NULL) 1674 *buf = opt->value; 1675 return (0); 1676 } 1677 } 1678 return (ENOENT); 1679 } 1680 1681 char * 1682 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1683 { 1684 struct vfsopt *opt; 1685 1686 *error = 0; 1687 TAILQ_FOREACH(opt, opts, link) { 1688 if (strcmp(name, opt->name) != 0) 1689 continue; 1690 if (((char *)opt->value)[opt->len - 1] != '\0') { 1691 *error = EINVAL; 1692 return (NULL); 1693 } 1694 return (opt->value); 1695 } 1696 return (NULL); 1697 } 1698 1699 int 1700 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1701 { 1702 struct vfsopt *opt; 1703 1704 TAILQ_FOREACH(opt, opts, link) { 1705 if (strcmp(name, opt->name) == 0) { 1706 if (w != NULL) 1707 *w |= val; 1708 return (1); 1709 } 1710 } 1711 if (w != NULL) 1712 *w &= ~val; 1713 return (0); 1714 } 1715 1716 int 1717 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1718 { 1719 va_list ap; 1720 struct vfsopt *opt; 1721 int ret; 1722 1723 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1724 1725 TAILQ_FOREACH(opt, opts, link) { 1726 if (strcmp(name, opt->name) != 0) 1727 continue; 1728 if (((char *)opt->value)[opt->len - 1] != '\0') 1729 return (0); 1730 va_start(ap, fmt); 1731 ret = vsscanf(opt->value, fmt, ap); 1732 va_end(ap); 1733 return (ret); 1734 } 1735 return (0); 1736 } 1737 1738 /* 1739 * Find and copy a mount option. 1740 * 1741 * The size of the buffer has to be specified 1742 * in len, if it is not the same length as the 1743 * mount option, EINVAL is returned. 1744 * Returns ENOENT if the option is not found. 1745 */ 1746 int 1747 vfs_copyopt(opts, name, dest, len) 1748 struct vfsoptlist *opts; 1749 const char *name; 1750 void *dest; 1751 int len; 1752 { 1753 struct vfsopt *opt; 1754 1755 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1756 1757 TAILQ_FOREACH(opt, opts, link) { 1758 if (strcmp(name, opt->name) == 0) { 1759 if (len != opt->len) 1760 return (EINVAL); 1761 bcopy(opt->value, dest, opt->len); 1762 return (0); 1763 } 1764 } 1765 return (ENOENT); 1766 } 1767 1768 /* 1769 * This is a helper function for filesystems to traverse their 1770 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1771 */ 1772 1773 struct vnode * 1774 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1775 { 1776 struct vnode *vp; 1777 1778 mtx_assert(MNT_MTX(mp), MA_OWNED); 1779 1780 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1781 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1782 while (vp != NULL && vp->v_type == VMARKER) 1783 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1784 1785 /* Check if we are done */ 1786 if (vp == NULL) { 1787 __mnt_vnode_markerfree(mvp, mp); 1788 return (NULL); 1789 } 1790 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1791 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1792 return (vp); 1793 } 1794 1795 struct vnode * 1796 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1797 { 1798 struct vnode *vp; 1799 1800 mtx_assert(MNT_MTX(mp), MA_OWNED); 1801 1802 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1803 while (vp != NULL && vp->v_type == VMARKER) 1804 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1805 1806 /* Check if we are done */ 1807 if (vp == NULL) { 1808 *mvp = NULL; 1809 return (NULL); 1810 } 1811 mp->mnt_holdcnt++; 1812 MNT_IUNLOCK(mp); 1813 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1814 M_VNODE_MARKER, 1815 M_WAITOK | M_ZERO); 1816 MNT_ILOCK(mp); 1817 (*mvp)->v_type = VMARKER; 1818 1819 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1820 while (vp != NULL && vp->v_type == VMARKER) 1821 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1822 1823 /* Check if we are done */ 1824 if (vp == NULL) { 1825 MNT_IUNLOCK(mp); 1826 free(*mvp, M_VNODE_MARKER); 1827 MNT_ILOCK(mp); 1828 *mvp = NULL; 1829 mp->mnt_holdcnt--; 1830 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1831 wakeup(&mp->mnt_holdcnt); 1832 return (NULL); 1833 } 1834 mp->mnt_markercnt++; 1835 (*mvp)->v_mount = mp; 1836 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1837 return (vp); 1838 } 1839 1840 1841 void 1842 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1843 { 1844 1845 if (*mvp == NULL) 1846 return; 1847 1848 mtx_assert(MNT_MTX(mp), MA_OWNED); 1849 1850 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1851 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1852 MNT_IUNLOCK(mp); 1853 free(*mvp, M_VNODE_MARKER); 1854 MNT_ILOCK(mp); 1855 *mvp = NULL; 1856 1857 mp->mnt_markercnt--; 1858 mp->mnt_holdcnt--; 1859 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1860 wakeup(&mp->mnt_holdcnt); 1861 } 1862 1863 1864 int 1865 __vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 1866 { 1867 int error; 1868 1869 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td); 1870 if (sbp != &mp->mnt_stat) 1871 *sbp = mp->mnt_stat; 1872 return (error); 1873 } 1874 1875 void 1876 vfs_mountedfrom(struct mount *mp, const char *from) 1877 { 1878 1879 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1880 strlcpy(mp->mnt_stat.f_mntfromname, from, 1881 sizeof mp->mnt_stat.f_mntfromname); 1882 } 1883 1884 /* 1885 * --------------------------------------------------------------------- 1886 * This is the api for building mount args and mounting filesystems from 1887 * inside the kernel. 1888 * 1889 * The API works by accumulation of individual args. First error is 1890 * latched. 1891 * 1892 * XXX: should be documented in new manpage kernel_mount(9) 1893 */ 1894 1895 /* A memory allocation which must be freed when we are done */ 1896 struct mntaarg { 1897 SLIST_ENTRY(mntaarg) next; 1898 }; 1899 1900 /* The header for the mount arguments */ 1901 struct mntarg { 1902 struct iovec *v; 1903 int len; 1904 int error; 1905 SLIST_HEAD(, mntaarg) list; 1906 }; 1907 1908 /* 1909 * Add a boolean argument. 1910 * 1911 * flag is the boolean value. 1912 * name must start with "no". 1913 */ 1914 struct mntarg * 1915 mount_argb(struct mntarg *ma, int flag, const char *name) 1916 { 1917 1918 KASSERT(name[0] == 'n' && name[1] == 'o', 1919 ("mount_argb(...,%s): name must start with 'no'", name)); 1920 1921 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 1922 } 1923 1924 /* 1925 * Add an argument printf style 1926 */ 1927 struct mntarg * 1928 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 1929 { 1930 va_list ap; 1931 struct mntaarg *maa; 1932 struct sbuf *sb; 1933 int len; 1934 1935 if (ma == NULL) { 1936 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1937 SLIST_INIT(&ma->list); 1938 } 1939 if (ma->error) 1940 return (ma); 1941 1942 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 1943 M_MOUNT, M_WAITOK); 1944 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 1945 ma->v[ma->len].iov_len = strlen(name) + 1; 1946 ma->len++; 1947 1948 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 1949 va_start(ap, fmt); 1950 sbuf_vprintf(sb, fmt, ap); 1951 va_end(ap); 1952 sbuf_finish(sb); 1953 len = sbuf_len(sb) + 1; 1954 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1955 SLIST_INSERT_HEAD(&ma->list, maa, next); 1956 bcopy(sbuf_data(sb), maa + 1, len); 1957 sbuf_delete(sb); 1958 1959 ma->v[ma->len].iov_base = maa + 1; 1960 ma->v[ma->len].iov_len = len; 1961 ma->len++; 1962 1963 return (ma); 1964 } 1965 1966 /* 1967 * Add an argument which is a userland string. 1968 */ 1969 struct mntarg * 1970 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 1971 { 1972 struct mntaarg *maa; 1973 char *tbuf; 1974 1975 if (val == NULL) 1976 return (ma); 1977 if (ma == NULL) { 1978 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 1979 SLIST_INIT(&ma->list); 1980 } 1981 if (ma->error) 1982 return (ma); 1983 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 1984 SLIST_INSERT_HEAD(&ma->list, maa, next); 1985 tbuf = (void *)(maa + 1); 1986 ma->error = copyinstr(val, tbuf, len, NULL); 1987 return (mount_arg(ma, name, tbuf, -1)); 1988 } 1989 1990 /* 1991 * Plain argument. 1992 * 1993 * If length is -1, use printf. 1994 */ 1995 struct mntarg * 1996 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 1997 { 1998 1999 if (ma == NULL) { 2000 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2001 SLIST_INIT(&ma->list); 2002 } 2003 if (ma->error) 2004 return (ma); 2005 2006 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2007 M_MOUNT, M_WAITOK); 2008 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2009 ma->v[ma->len].iov_len = strlen(name) + 1; 2010 ma->len++; 2011 2012 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 2013 if (len < 0) 2014 ma->v[ma->len].iov_len = strlen(val) + 1; 2015 else 2016 ma->v[ma->len].iov_len = len; 2017 ma->len++; 2018 return (ma); 2019 } 2020 2021 /* 2022 * Free a mntarg structure 2023 */ 2024 static void 2025 free_mntarg(struct mntarg *ma) 2026 { 2027 struct mntaarg *maa; 2028 2029 while (!SLIST_EMPTY(&ma->list)) { 2030 maa = SLIST_FIRST(&ma->list); 2031 SLIST_REMOVE_HEAD(&ma->list, next); 2032 free(maa, M_MOUNT); 2033 } 2034 free(ma->v, M_MOUNT); 2035 free(ma, M_MOUNT); 2036 } 2037 2038 /* 2039 * Mount a filesystem 2040 */ 2041 int 2042 kernel_mount(struct mntarg *ma, int flags) 2043 { 2044 struct uio auio; 2045 int error; 2046 2047 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2048 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2049 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2050 2051 auio.uio_iov = ma->v; 2052 auio.uio_iovcnt = ma->len; 2053 auio.uio_segflg = UIO_SYSSPACE; 2054 2055 error = ma->error; 2056 if (!error) 2057 error = vfs_donmount(curthread, flags, &auio); 2058 free_mntarg(ma); 2059 return (error); 2060 } 2061 2062 /* 2063 * A printflike function to mount a filesystem. 2064 */ 2065 int 2066 kernel_vmount(int flags, ...) 2067 { 2068 struct mntarg *ma = NULL; 2069 va_list ap; 2070 const char *cp; 2071 const void *vp; 2072 int error; 2073 2074 va_start(ap, flags); 2075 for (;;) { 2076 cp = va_arg(ap, const char *); 2077 if (cp == NULL) 2078 break; 2079 vp = va_arg(ap, const void *); 2080 ma = mount_arg(ma, cp, vp, -1); 2081 } 2082 va_end(ap); 2083 2084 error = kernel_mount(ma, flags); 2085 return (error); 2086 }
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