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/6.3/sys/kern/vfs_mount.c 173886 2007-11-24 19:45:58Z 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 static int vfs_getopt_pos(struct vfsoptlist *opts, const char *name); 90 91 static int usermount = 0; 92 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0, 93 "Unprivileged users may mount and unmount file systems"); 94 95 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure"); 96 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 97 static uma_zone_t mount_zone; 98 99 /* List of mounted filesystems. */ 100 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); 101 102 /* For any iteration/modification of mountlist */ 103 struct mtx mountlist_mtx; 104 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF); 105 106 TAILQ_HEAD(vfsoptlist, vfsopt); 107 struct vfsopt { 108 TAILQ_ENTRY(vfsopt) link; 109 char *name; 110 void *value; 111 int len; 112 }; 113 114 /* 115 * The vnode of the system's root (/ in the filesystem, without chroot 116 * active.) 117 */ 118 struct vnode *rootvnode; 119 120 /* 121 * The root filesystem is detailed in the kernel environment variable 122 * vfs.root.mountfrom, which is expected to be in the general format 123 * 124 * <vfsname>:[<path>] 125 * vfsname := the name of a VFS known to the kernel and capable 126 * of being mounted as root 127 * path := disk device name or other data used by the filesystem 128 * to locate its physical store 129 */ 130 131 /* 132 * Global opts, taken by all filesystems 133 */ 134 static const char *global_opts[] = { 135 "errmsg", 136 "fstype", 137 "fspath", 138 "rdonly", 139 "ro", 140 "rw", 141 "suid", 142 "exec", 143 "update", 144 NULL 145 }; 146 147 /* 148 * The root specifiers we will try if RB_CDROM is specified. 149 */ 150 static char *cdrom_rootdevnames[] = { 151 "cd9660:cd0", 152 "cd9660:acd0", 153 NULL 154 }; 155 156 /* legacy find-root code */ 157 char *rootdevnames[2] = {NULL, NULL}; 158 #ifndef ROOTDEVNAME 159 # define ROOTDEVNAME NULL 160 #endif 161 static const char *ctrootdevname = ROOTDEVNAME; 162 163 /* 164 * --------------------------------------------------------------------- 165 * Functions for building and sanitizing the mount options 166 */ 167 168 /* Remove one mount option. */ 169 static void 170 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt) 171 { 172 173 TAILQ_REMOVE(opts, opt, link); 174 free(opt->name, M_MOUNT); 175 if (opt->value != NULL) 176 free(opt->value, M_MOUNT); 177 #ifdef INVARIANTS 178 else if (opt->len != 0) 179 panic("%s: mount option with NULL value but length != 0", 180 __func__); 181 #endif 182 free(opt, M_MOUNT); 183 } 184 185 /* Release all resources related to the mount options. */ 186 static void 187 vfs_freeopts(struct vfsoptlist *opts) 188 { 189 struct vfsopt *opt; 190 191 while (!TAILQ_EMPTY(opts)) { 192 opt = TAILQ_FIRST(opts); 193 vfs_freeopt(opts, opt); 194 } 195 free(opts, M_MOUNT); 196 } 197 198 void 199 vfs_deleteopt(struct vfsoptlist *opts, const char *name) 200 { 201 struct vfsopt *opt, *temp; 202 203 TAILQ_FOREACH_SAFE(opt, opts, link, temp) { 204 if (strcmp(opt->name, name) == 0) 205 vfs_freeopt(opts, opt); 206 } 207 } 208 209 /* 210 * Check if options are equal (with or without the "no" prefix). 211 */ 212 static int 213 vfs_equalopts(const char *opt1, const char *opt2) 214 { 215 216 /* "opt" vs. "opt" or "noopt" vs. "noopt" */ 217 if (strcmp(opt1, opt2) == 0) 218 return (1); 219 /* "noopt" vs. "opt" */ 220 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0) 221 return (1); 222 /* "opt" vs. "noopt" */ 223 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0) 224 return (1); 225 return (0); 226 } 227 228 /* 229 * If a mount option is specified several times, 230 * (with or without the "no" prefix) only keep 231 * the last occurence of it. 232 */ 233 static void 234 vfs_sanitizeopts(struct vfsoptlist *opts) 235 { 236 struct vfsopt *opt, *opt2, *tmp; 237 238 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) { 239 opt2 = TAILQ_PREV(opt, vfsoptlist, link); 240 while (opt2 != NULL) { 241 if (vfs_equalopts(opt->name, opt2->name)) { 242 tmp = TAILQ_PREV(opt2, vfsoptlist, link); 243 vfs_freeopt(opts, opt2); 244 opt2 = tmp; 245 } else { 246 opt2 = TAILQ_PREV(opt2, vfsoptlist, link); 247 } 248 } 249 } 250 } 251 252 /* 253 * Build a linked list of mount options from a struct uio. 254 */ 255 static int 256 vfs_buildopts(struct uio *auio, struct vfsoptlist **options) 257 { 258 struct vfsoptlist *opts; 259 struct vfsopt *opt; 260 size_t memused; 261 unsigned int i, iovcnt; 262 int error, namelen, optlen; 263 264 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 265 TAILQ_INIT(opts); 266 memused = 0; 267 iovcnt = auio->uio_iovcnt; 268 for (i = 0; i < iovcnt; i += 2) { 269 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 270 namelen = auio->uio_iov[i].iov_len; 271 optlen = auio->uio_iov[i + 1].iov_len; 272 opt->name = malloc(namelen, M_MOUNT, M_WAITOK); 273 opt->value = NULL; 274 opt->len = 0; 275 276 /* 277 * Do this early, so jumps to "bad" will free the current 278 * option. 279 */ 280 TAILQ_INSERT_TAIL(opts, opt, link); 281 memused += sizeof(struct vfsopt) + optlen + namelen; 282 283 /* 284 * Avoid consuming too much memory, and attempts to overflow 285 * memused. 286 */ 287 if (memused > VFS_MOUNTARG_SIZE_MAX || 288 optlen > VFS_MOUNTARG_SIZE_MAX || 289 namelen > VFS_MOUNTARG_SIZE_MAX) { 290 error = EINVAL; 291 goto bad; 292 } 293 294 if (auio->uio_segflg == UIO_SYSSPACE) { 295 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen); 296 } else { 297 error = copyin(auio->uio_iov[i].iov_base, opt->name, 298 namelen); 299 if (error) 300 goto bad; 301 } 302 /* Ensure names are null-terminated strings. */ 303 if (opt->name[namelen - 1] != '\0') { 304 error = EINVAL; 305 goto bad; 306 } 307 if (optlen != 0) { 308 opt->len = optlen; 309 opt->value = malloc(optlen, M_MOUNT, M_WAITOK); 310 if (auio->uio_segflg == UIO_SYSSPACE) { 311 bcopy(auio->uio_iov[i + 1].iov_base, opt->value, 312 optlen); 313 } else { 314 error = copyin(auio->uio_iov[i + 1].iov_base, 315 opt->value, optlen); 316 if (error) 317 goto bad; 318 } 319 } 320 } 321 vfs_sanitizeopts(opts); 322 *options = opts; 323 return (0); 324 bad: 325 vfs_freeopts(opts); 326 return (error); 327 } 328 329 /* 330 * Merge the old mount options with the new ones passed 331 * in the MNT_UPDATE case. 332 */ 333 static void 334 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *opts) 335 { 336 struct vfsopt *opt, *opt2, *new; 337 338 TAILQ_FOREACH(opt, opts, link) { 339 /* 340 * Check that this option hasn't been redefined 341 * nor cancelled with a "no" mount option. 342 */ 343 opt2 = TAILQ_FIRST(toopts); 344 while (opt2 != NULL) { 345 if (strcmp(opt2->name, opt->name) == 0) 346 goto next; 347 if (strncmp(opt2->name, "no", 2) == 0 && 348 strcmp(opt2->name + 2, opt->name) == 0) { 349 vfs_freeopt(toopts, opt2); 350 goto next; 351 } 352 opt2 = TAILQ_NEXT(opt2, link); 353 } 354 /* We want this option, duplicate it. */ 355 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 356 new->name = malloc(strlen(opt->name) + 1, M_MOUNT, M_WAITOK); 357 strcpy(new->name, opt->name); 358 if (opt->len != 0) { 359 new->value = malloc(opt->len, M_MOUNT, M_WAITOK); 360 bcopy(opt->value, new->value, opt->len); 361 } else { 362 new->value = NULL; 363 } 364 new->len = opt->len; 365 TAILQ_INSERT_TAIL(toopts, new, link); 366 next: 367 continue; 368 } 369 } 370 371 /* 372 * --------------------------------------------------------------------- 373 * Mount a filesystem 374 */ 375 int 376 nmount(td, uap) 377 struct thread *td; 378 struct nmount_args /* { 379 struct iovec *iovp; 380 unsigned int iovcnt; 381 int flags; 382 } */ *uap; 383 { 384 struct uio *auio; 385 struct iovec *iov; 386 unsigned int i; 387 int error; 388 u_int iovcnt; 389 390 AUDIT_ARG(fflags, uap->flags); 391 392 /* Kick out MNT_ROOTFS early as it is legal internally */ 393 if (uap->flags & MNT_ROOTFS) 394 return (EINVAL); 395 396 iovcnt = uap->iovcnt; 397 /* 398 * Check that we have an even number of iovec's 399 * and that we have at least two options. 400 */ 401 if ((iovcnt & 1) || (iovcnt < 4)) 402 return (EINVAL); 403 404 error = copyinuio(uap->iovp, iovcnt, &auio); 405 if (error) 406 return (error); 407 iov = auio->uio_iov; 408 for (i = 0; i < iovcnt; i++) { 409 if (iov->iov_len > MMAXOPTIONLEN) { 410 free(auio, M_IOV); 411 return (EINVAL); 412 } 413 iov++; 414 } 415 error = vfs_donmount(td, uap->flags, auio); 416 free(auio, M_IOV); 417 return (error); 418 } 419 420 /* 421 * --------------------------------------------------------------------- 422 * Various utility functions 423 */ 424 425 void 426 vfs_ref(struct mount *mp) 427 { 428 429 MNT_ILOCK(mp); 430 MNT_REF(mp); 431 MNT_IUNLOCK(mp); 432 } 433 434 void 435 vfs_rel(struct mount *mp) 436 { 437 438 MNT_ILOCK(mp); 439 MNT_REL(mp); 440 MNT_IUNLOCK(mp); 441 } 442 443 static int 444 mount_init(void *mem, int size, int flags) 445 { 446 struct mount *mp; 447 448 mp = (struct mount *)mem; 449 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF); 450 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 451 return (0); 452 } 453 454 static void 455 mount_fini(void *mem, int size) 456 { 457 struct mount *mp; 458 459 mp = (struct mount *)mem; 460 lockdestroy(&mp->mnt_lock); 461 mtx_destroy(&mp->mnt_mtx); 462 } 463 464 /* 465 * Allocate and initialize the mount point struct. 466 */ 467 static int 468 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, 469 const char *fspath, struct thread *td, struct mount **mpp) 470 { 471 struct mount *mp; 472 473 mp = uma_zalloc(mount_zone, M_WAITOK); 474 bzero(&mp->mnt_startzero, 475 __rangeof(struct mount, mnt_startzero, mnt_endzero)); 476 bzero(&mp->mnt_startzero2, 477 __rangeof(struct mount, mnt_startzero2, mnt_endzero2)); 478 TAILQ_INIT(&mp->mnt_nvnodelist); 479 mp->mnt_nvnodelistsize = 0; 480 mp->mnt_ref = 0; 481 (void) vfs_busy(mp, LK_NOWAIT, 0, td); 482 mp->mnt_op = vfsp->vfc_vfsops; 483 mp->mnt_vfc = vfsp; 484 vfsp->vfc_refcount++; /* XXX Unlocked */ 485 mp->mnt_stat.f_type = vfsp->vfc_typenum; 486 MNT_ILOCK(mp); 487 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 488 MNT_IUNLOCK(mp); 489 mp->mnt_gen++; 490 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 491 mp->mnt_vnodecovered = vp; 492 mp->mnt_cred = crdup(td->td_ucred); 493 mp->mnt_stat.f_owner = td->td_ucred->cr_uid; 494 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN); 495 mp->mnt_iosize_max = DFLTPHYS; 496 #ifdef MAC 497 mac_init_mount(mp); 498 mac_create_mount(td->td_ucred, mp); 499 #endif 500 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0); 501 *mpp = mp; 502 return (0); 503 } 504 505 /* 506 * Destroy the mount struct previously allocated by vfs_mount_alloc(). 507 */ 508 static void 509 vfs_mount_destroy(struct mount *mp) 510 { 511 int i; 512 513 MNT_ILOCK(mp); 514 for (i = 0; mp->mnt_ref && i < 3; i++) 515 msleep(mp, MNT_MTX(mp), PVFS, "mntref", hz); 516 /* 517 * This will always cause a 3 second delay in rebooting due to 518 * refs on the root mountpoint that never go away. Most of these 519 * are held by init which never exits. 520 */ 521 if (i == 3 && (!rebooting || bootverbose)) 522 printf("Mount point %s had %d dangling refs\n", 523 mp->mnt_stat.f_mntonname, mp->mnt_ref); 524 if (mp->mnt_holdcnt != 0) { 525 printf("Waiting for mount point to be unheld\n"); 526 while (mp->mnt_holdcnt != 0) { 527 mp->mnt_holdcntwaiters++; 528 msleep(&mp->mnt_holdcnt, MNT_MTX(mp), 529 PZERO, "mntdestroy", 0); 530 mp->mnt_holdcntwaiters--; 531 } 532 printf("mount point unheld\n"); 533 } 534 if (mp->mnt_writeopcount > 0) { 535 printf("Waiting for mount point write ops\n"); 536 while (mp->mnt_writeopcount > 0) { 537 mp->mnt_kern_flag |= MNTK_SUSPEND; 538 msleep(&mp->mnt_writeopcount, 539 MNT_MTX(mp), 540 PZERO, "mntdestroy2", 0); 541 } 542 printf("mount point write ops completed\n"); 543 } 544 if (mp->mnt_secondary_writes > 0) { 545 printf("Waiting for mount point secondary write ops\n"); 546 while (mp->mnt_secondary_writes > 0) { 547 mp->mnt_kern_flag |= MNTK_SUSPEND; 548 msleep(&mp->mnt_secondary_writes, 549 MNT_MTX(mp), 550 PZERO, "mntdestroy3", 0); 551 } 552 printf("mount point secondary write ops completed\n"); 553 } 554 MNT_IUNLOCK(mp); 555 mp->mnt_vfc->vfc_refcount--; 556 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) { 557 struct vnode *vp; 558 559 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) 560 vprint("", vp); 561 panic("unmount: dangling vnode"); 562 } 563 MNT_ILOCK(mp); 564 if (mp->mnt_kern_flag & MNTK_MWAIT) 565 wakeup(mp); 566 if (mp->mnt_writeopcount != 0) 567 panic("vfs_mount_destroy: nonzero writeopcount"); 568 if (mp->mnt_secondary_writes != 0) 569 panic("vfs_mount_destroy: nonzero secondary_writes"); 570 if (mp->mnt_nvnodelistsize != 0) 571 panic("vfs_mount_destroy: nonzero nvnodelistsize"); 572 mp->mnt_writeopcount = -1000; 573 mp->mnt_nvnodelistsize = -1000; 574 mp->mnt_secondary_writes = -1000; 575 MNT_IUNLOCK(mp); 576 #ifdef MAC 577 mac_destroy_mount(mp); 578 #endif 579 if (mp->mnt_opt != NULL) 580 vfs_freeopts(mp->mnt_opt); 581 crfree(mp->mnt_cred); 582 uma_zfree(mount_zone, mp); 583 } 584 585 static int 586 vfs_donmount(struct thread *td, int fsflags, struct uio *fsoptions) 587 { 588 struct vfsoptlist *optlist; 589 struct vfsopt *opt, *noro_opt; 590 char *fstype, *fspath, *errmsg; 591 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos; 592 int has_rw, has_noro; 593 594 errmsg = NULL; 595 errmsg_len = 0; 596 errmsg_pos = -1; 597 has_rw = 0; 598 has_noro = 0; 599 600 error = vfs_buildopts(fsoptions, &optlist); 601 if (error) 602 return (error); 603 604 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0) 605 errmsg_pos = vfs_getopt_pos(optlist, "errmsg"); 606 607 /* 608 * We need these two options before the others, 609 * and they are mandatory for any filesystem. 610 * Ensure they are NUL terminated as well. 611 */ 612 fstypelen = 0; 613 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen); 614 if (error || fstype[fstypelen - 1] != '\0') { 615 error = EINVAL; 616 if (errmsg != NULL) 617 strncpy(errmsg, "Invalid fstype", errmsg_len); 618 goto bail; 619 } 620 fspathlen = 0; 621 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen); 622 if (error || fspath[fspathlen - 1] != '\0') { 623 error = EINVAL; 624 if (errmsg != NULL) 625 strncpy(errmsg, "Invalid fspath", errmsg_len); 626 goto bail; 627 } 628 629 /* 630 * We need to see if we have the "update" option 631 * before we call vfs_domount(), since vfs_domount() has special 632 * logic based on MNT_UPDATE. This is very important 633 * when we want to update the root filesystem. 634 */ 635 TAILQ_FOREACH(opt, optlist, link) { 636 if (strcmp(opt->name, "update") == 0) 637 fsflags |= MNT_UPDATE; 638 else if (strcmp(opt->name, "async") == 0) 639 fsflags |= MNT_ASYNC; 640 else if (strcmp(opt->name, "force") == 0) 641 fsflags |= MNT_FORCE; 642 else if (strcmp(opt->name, "multilabel") == 0) 643 fsflags |= MNT_MULTILABEL; 644 else if (strcmp(opt->name, "noasync") == 0) 645 fsflags &= ~MNT_ASYNC; 646 else if (strcmp(opt->name, "noatime") == 0) 647 fsflags |= MNT_NOATIME; 648 else if (strcmp(opt->name, "noclusterr") == 0) 649 fsflags |= MNT_NOCLUSTERR; 650 else if (strcmp(opt->name, "noclusterw") == 0) 651 fsflags |= MNT_NOCLUSTERW; 652 else if (strcmp(opt->name, "noexec") == 0) 653 fsflags |= MNT_NOEXEC; 654 else if (strcmp(opt->name, "nosuid") == 0) 655 fsflags |= MNT_NOSUID; 656 else if (strcmp(opt->name, "nosymfollow") == 0) 657 fsflags |= MNT_NOSYMFOLLOW; 658 else if (strcmp(opt->name, "noro") == 0) { 659 fsflags &= ~MNT_RDONLY; 660 has_noro = 1; 661 } 662 else if (strcmp(opt->name, "rw") == 0) { 663 fsflags &= ~MNT_RDONLY; 664 has_rw = 1; 665 } 666 else if (strcmp(opt->name, "ro") == 0 || 667 strcmp(opt->name, "rdonly") == 0) 668 fsflags |= MNT_RDONLY; 669 else if (strcmp(opt->name, "snapshot") == 0) 670 fsflags |= MNT_SNAPSHOT; 671 else if (strcmp(opt->name, "suiddir") == 0) 672 fsflags |= MNT_SUIDDIR; 673 else if (strcmp(opt->name, "sync") == 0) 674 fsflags |= MNT_SYNCHRONOUS; 675 else if (strcmp(opt->name, "union") == 0) 676 fsflags |= MNT_UNION; 677 } 678 679 /* 680 * If "rw" was specified as a mount option, and we 681 * are trying to update a mount-point from "ro" to "rw", 682 * we need a mount option "noro", since in vfs_mergeopts(), 683 * "noro" will cancel "ro", but "rw" will not do anything. 684 */ 685 if (has_rw && !has_noro) { 686 noro_opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK); 687 noro_opt->name = strdup("noro", M_MOUNT); 688 noro_opt->value = NULL; 689 noro_opt->len = 0; 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 * --------------------------------------------------------------------- 728 * Old mount API. 729 */ 730 #ifndef _SYS_SYSPROTO_H_ 731 struct mount_args { 732 char *type; 733 char *path; 734 int flags; 735 caddr_t data; 736 }; 737 #endif 738 /* ARGSUSED */ 739 int 740 mount(td, uap) 741 struct thread *td; 742 struct mount_args /* { 743 char *type; 744 char *path; 745 int flags; 746 caddr_t data; 747 } */ *uap; 748 { 749 char *fstype; 750 struct vfsconf *vfsp = NULL; 751 struct mntarg *ma = NULL; 752 int error; 753 754 AUDIT_ARG(fflags, uap->flags); 755 756 /* Kick out MNT_ROOTFS early as it is legal internally */ 757 uap->flags &= ~MNT_ROOTFS; 758 759 if (uap->data == NULL) 760 return (EINVAL); 761 762 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK); 763 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL); 764 if (!error) { 765 AUDIT_ARG(text, fstype); 766 mtx_lock(&Giant); /* XXX ? */ 767 vfsp = vfs_byname_kld(fstype, td, &error); 768 mtx_unlock(&Giant); 769 } 770 free(fstype, M_TEMP); 771 if (error) 772 return (error); 773 if (vfsp == NULL) 774 return (ENOENT); 775 if (vfsp->vfc_vfsops->vfs_cmount == NULL) 776 return (EOPNOTSUPP); 777 778 ma = mount_argsu(ma, "fstype", uap->type, MNAMELEN); 779 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN); 780 ma = mount_argb(ma, uap->flags & MNT_RDONLY, "noro"); 781 ma = mount_argb(ma, !(uap->flags & MNT_NOSUID), "nosuid"); 782 ma = mount_argb(ma, !(uap->flags & MNT_NOEXEC), "noexec"); 783 784 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, uap->flags, td); 785 return (error); 786 } 787 788 789 /* 790 * vfs_domount(): actually attempt a filesystem mount. 791 */ 792 static int 793 vfs_domount( 794 struct thread *td, /* Flags common to all filesystems. */ 795 const char *fstype, /* Filesystem type. */ 796 char *fspath, /* Mount path. */ 797 int fsflags, /* Flags common to all filesystems. */ 798 void *fsdata /* Options local to the filesystem. */ 799 ) 800 { 801 struct vnode *vp; 802 struct mount *mp; 803 struct vfsconf *vfsp; 804 struct export_args export; 805 int error, flag = 0; 806 struct vattr va; 807 struct nameidata nd; 808 809 mtx_assert(&Giant, MA_OWNED); 810 /* 811 * Be ultra-paranoid about making sure the type and fspath 812 * variables will fit in our mp buffers, including the 813 * terminating NUL. 814 */ 815 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN) 816 return (ENAMETOOLONG); 817 818 if (jailed(td->td_ucred)) 819 return (EPERM); 820 if (usermount == 0) { 821 if ((error = suser(td)) != 0) 822 return (error); 823 } 824 825 /* 826 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users. 827 */ 828 if (fsflags & (MNT_EXPORTED | MNT_SUIDDIR)) { 829 if ((error = suser(td)) != 0) 830 return (error); 831 } 832 /* 833 * Silently enforce MNT_NOSUID and MNT_USER for 834 * unprivileged users. 835 */ 836 if (suser(td) != 0) 837 fsflags |= MNT_NOSUID | MNT_USER; 838 839 /* Load KLDs before we lock the covered vnode to avoid reversals. */ 840 vfsp = NULL; 841 if ((fsflags & MNT_UPDATE) == 0) { 842 /* Don't try to load KLDs if we're mounting the root. */ 843 if (fsflags & MNT_ROOTFS) 844 vfsp = vfs_byname(fstype); 845 else 846 vfsp = vfs_byname_kld(fstype, td, &error); 847 if (vfsp == NULL) 848 return (ENODEV); 849 } 850 /* 851 * Get vnode to be covered 852 */ 853 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1, UIO_SYSSPACE, 854 fspath, td); 855 if ((error = namei(&nd)) != 0) 856 return (error); 857 NDFREE(&nd, NDF_ONLY_PNBUF); 858 vp = nd.ni_vp; 859 if (fsflags & MNT_UPDATE) { 860 if ((vp->v_vflag & VV_ROOT) == 0) { 861 vput(vp); 862 return (EINVAL); 863 } 864 mp = vp->v_mount; 865 MNT_ILOCK(mp); 866 flag = mp->mnt_flag; 867 /* 868 * We only allow the filesystem to be reloaded if it 869 * is currently mounted read-only. 870 */ 871 if ((fsflags & MNT_RELOAD) && 872 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 873 MNT_IUNLOCK(mp); 874 vput(vp); 875 return (EOPNOTSUPP); /* Needs translation */ 876 } 877 MNT_IUNLOCK(mp); 878 /* 879 * Only privileged root, or (if MNT_USER is set) the user that 880 * did the original mount is permitted to update it. 881 */ 882 error = vfs_suser(mp, td); 883 if (error) { 884 vput(vp); 885 return (error); 886 } 887 if (vfs_busy(mp, LK_NOWAIT, 0, td)) { 888 vput(vp); 889 return (EBUSY); 890 } 891 VI_LOCK(vp); 892 if ((vp->v_iflag & VI_MOUNT) != 0 || 893 vp->v_mountedhere != NULL) { 894 VI_UNLOCK(vp); 895 vfs_unbusy(mp, td); 896 vput(vp); 897 return (EBUSY); 898 } 899 vp->v_iflag |= VI_MOUNT; 900 VI_UNLOCK(vp); 901 MNT_ILOCK(mp); 902 mp->mnt_flag |= fsflags & 903 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_SNAPSHOT | MNT_ROOTFS); 904 MNT_IUNLOCK(mp); 905 VOP_UNLOCK(vp, 0, td); 906 mp->mnt_optnew = fsdata; 907 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt); 908 } else { 909 /* 910 * If the user is not root, ensure that they own the directory 911 * onto which we are attempting to mount. 912 */ 913 error = VOP_GETATTR(vp, &va, td->td_ucred, td); 914 if (error) { 915 vput(vp); 916 return (error); 917 } 918 if (va.va_uid != td->td_ucred->cr_uid) { 919 if ((error = suser(td)) != 0) { 920 vput(vp); 921 return (error); 922 } 923 } 924 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 925 if (error != 0) { 926 vput(vp); 927 return (error); 928 } 929 if (vp->v_type != VDIR) { 930 vput(vp); 931 return (ENOTDIR); 932 } 933 VI_LOCK(vp); 934 if ((vp->v_iflag & VI_MOUNT) != 0 || 935 vp->v_mountedhere != NULL) { 936 VI_UNLOCK(vp); 937 vput(vp); 938 return (EBUSY); 939 } 940 vp->v_iflag |= VI_MOUNT; 941 VI_UNLOCK(vp); 942 943 /* 944 * Allocate and initialize the filesystem. 945 */ 946 error = vfs_mount_alloc(vp, vfsp, fspath, td, &mp); 947 if (error) { 948 vput(vp); 949 return (error); 950 } 951 VOP_UNLOCK(vp, 0, td); 952 953 /* XXXMAC: pass to vfs_mount_alloc? */ 954 mp->mnt_optnew = fsdata; 955 } 956 957 /* 958 * Set the mount level flags. 959 */ 960 MNT_ILOCK(mp); 961 mp->mnt_flag = (mp->mnt_flag & ~MNT_UPDATEMASK) | 962 (fsflags & (MNT_UPDATEMASK | MNT_FORCE | MNT_ROOTFS | 963 MNT_RDONLY)); 964 MNT_IUNLOCK(mp); 965 /* 966 * Mount the filesystem. 967 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they 968 * get. No freeing of cn_pnbuf. 969 */ 970 error = VFS_MOUNT(mp, td); 971 972 /* 973 * Process the export option only if we are 974 * updating mount options. 975 */ 976 if (!error && (fsflags & MNT_UPDATE)) { 977 if (vfs_copyopt(mp->mnt_optnew, "export", &export, 978 sizeof(export)) == 0) 979 error = vfs_export(mp, &export); 980 } 981 982 if (!error) { 983 if (mp->mnt_opt != NULL) 984 vfs_freeopts(mp->mnt_opt); 985 mp->mnt_opt = mp->mnt_optnew; 986 (void)VFS_STATFS(mp, &mp->mnt_stat, td); 987 } 988 /* 989 * Prevent external consumers of mount options from reading 990 * mnt_optnew. 991 */ 992 mp->mnt_optnew = NULL; 993 if (mp->mnt_flag & MNT_UPDATE) { 994 MNT_ILOCK(mp); 995 if (error) 996 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | 997 (flag & ~MNT_QUOTA); 998 else 999 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | 1000 MNT_FORCE | MNT_SNAPSHOT); 1001 MNT_IUNLOCK(mp); 1002 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 1003 if (mp->mnt_syncer == NULL) 1004 error = vfs_allocate_syncvnode(mp); 1005 } else { 1006 if (mp->mnt_syncer != NULL) 1007 vrele(mp->mnt_syncer); 1008 mp->mnt_syncer = NULL; 1009 } 1010 vfs_unbusy(mp, td); 1011 VI_LOCK(vp); 1012 vp->v_iflag &= ~VI_MOUNT; 1013 VI_UNLOCK(vp); 1014 vrele(vp); 1015 return (error); 1016 } 1017 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1018 /* 1019 * Put the new filesystem on the mount list after root. 1020 */ 1021 cache_purge(vp); 1022 if (!error) { 1023 struct vnode *newdp; 1024 1025 VI_LOCK(vp); 1026 vp->v_iflag &= ~VI_MOUNT; 1027 VI_UNLOCK(vp); 1028 vp->v_mountedhere = mp; 1029 mtx_lock(&mountlist_mtx); 1030 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1031 mtx_unlock(&mountlist_mtx); 1032 vfs_event_signal(NULL, VQ_MOUNT, 0); 1033 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp, td)) 1034 panic("mount: lost mount"); 1035 mountcheckdirs(vp, newdp); 1036 vput(newdp); 1037 VOP_UNLOCK(vp, 0, td); 1038 if ((mp->mnt_flag & MNT_RDONLY) == 0) 1039 error = vfs_allocate_syncvnode(mp); 1040 vfs_unbusy(mp, td); 1041 if (error) 1042 vrele(vp); 1043 } else { 1044 VI_LOCK(vp); 1045 vp->v_iflag &= ~VI_MOUNT; 1046 VI_UNLOCK(vp); 1047 vfs_unbusy(mp, td); 1048 vfs_mount_destroy(mp); 1049 vput(vp); 1050 } 1051 return (error); 1052 } 1053 1054 /* 1055 * --------------------------------------------------------------------- 1056 * Unmount a filesystem. 1057 * 1058 * Note: unmount takes a path to the vnode mounted on as argument, 1059 * not special file (as before). 1060 */ 1061 #ifndef _SYS_SYSPROTO_H_ 1062 struct unmount_args { 1063 char *path; 1064 int flags; 1065 }; 1066 #endif 1067 /* ARGSUSED */ 1068 int 1069 unmount(td, uap) 1070 struct thread *td; 1071 register struct unmount_args /* { 1072 char *path; 1073 int flags; 1074 } */ *uap; 1075 { 1076 struct mount *mp; 1077 char *pathbuf; 1078 int error, id0, id1; 1079 1080 if (jailed(td->td_ucred)) 1081 return (EPERM); 1082 if (usermount == 0) { 1083 if ((error = suser(td)) != 0) 1084 return (error); 1085 } 1086 1087 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK); 1088 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL); 1089 if (error) { 1090 free(pathbuf, M_TEMP); 1091 return (error); 1092 } 1093 AUDIT_ARG(upath, td, pathbuf, ARG_UPATH1); 1094 if (uap->flags & MNT_BYFSID) { 1095 /* Decode the filesystem ID. */ 1096 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) { 1097 free(pathbuf, M_TEMP); 1098 return (EINVAL); 1099 } 1100 1101 mtx_lock(&mountlist_mtx); 1102 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1103 if (mp->mnt_stat.f_fsid.val[0] == id0 && 1104 mp->mnt_stat.f_fsid.val[1] == id1) 1105 break; 1106 } 1107 mtx_unlock(&mountlist_mtx); 1108 } else { 1109 mtx_lock(&mountlist_mtx); 1110 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1111 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) 1112 break; 1113 } 1114 mtx_unlock(&mountlist_mtx); 1115 } 1116 free(pathbuf, M_TEMP); 1117 if (mp == NULL) { 1118 /* 1119 * Previously we returned ENOENT for a nonexistent path and 1120 * EINVAL for a non-mountpoint. We cannot tell these apart 1121 * now, so in the !MNT_BYFSID case return the more likely 1122 * EINVAL for compatibility. 1123 */ 1124 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL); 1125 } 1126 1127 /* 1128 * Don't allow unmounting the root filesystem. 1129 */ 1130 if (mp->mnt_flag & MNT_ROOTFS) 1131 return (EINVAL); 1132 mtx_lock(&Giant); 1133 error = dounmount(mp, uap->flags, td); 1134 mtx_unlock(&Giant); 1135 return (error); 1136 } 1137 1138 /* 1139 * Do the actual filesystem unmount. 1140 */ 1141 int 1142 dounmount(mp, flags, td) 1143 struct mount *mp; 1144 int flags; 1145 struct thread *td; 1146 { 1147 struct vnode *coveredvp, *fsrootvp; 1148 int error; 1149 int async_flag; 1150 int mnt_gen_r; 1151 1152 mtx_assert(&Giant, MA_OWNED); 1153 1154 if ((coveredvp = mp->mnt_vnodecovered) != NULL) { 1155 mnt_gen_r = mp->mnt_gen; 1156 VI_LOCK(coveredvp); 1157 vholdl(coveredvp); 1158 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY, td); 1159 vdrop(coveredvp); 1160 /* 1161 * Check for mp being unmounted while waiting for the 1162 * covered vnode lock. 1163 */ 1164 if (coveredvp->v_mountedhere != mp || 1165 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) { 1166 VOP_UNLOCK(coveredvp, 0, td); 1167 return (EBUSY); 1168 } 1169 } 1170 /* 1171 * Only privileged root, or (if MNT_USER is set) the user that did the 1172 * original mount is permitted to unmount this filesystem. 1173 */ 1174 error = vfs_suser(mp, td); 1175 if (error) { 1176 if (coveredvp) 1177 VOP_UNLOCK(coveredvp, 0, td); 1178 return (error); 1179 } 1180 1181 MNT_ILOCK(mp); 1182 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 1183 MNT_IUNLOCK(mp); 1184 if (coveredvp) 1185 VOP_UNLOCK(coveredvp, 0, td); 1186 return (EBUSY); 1187 } 1188 mp->mnt_kern_flag |= MNTK_UNMOUNT; 1189 /* Allow filesystems to detect that a forced unmount is in progress. */ 1190 if (flags & MNT_FORCE) 1191 mp->mnt_kern_flag |= MNTK_UNMOUNTF; 1192 error = lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK | 1193 ((flags & MNT_FORCE) ? 0 : LK_NOWAIT), MNT_MTX(mp), td); 1194 if (error) { 1195 MNT_ILOCK(mp); 1196 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1197 if (mp->mnt_kern_flag & MNTK_MWAIT) 1198 wakeup(mp); 1199 MNT_IUNLOCK(mp); 1200 if (coveredvp) 1201 VOP_UNLOCK(coveredvp, 0, td); 1202 return (error); 1203 } 1204 vn_start_write(NULL, &mp, V_WAIT); 1205 1206 if (mp->mnt_flag & MNT_EXPUBLIC) 1207 vfs_setpublicfs(NULL, NULL, NULL); 1208 1209 vfs_msync(mp, MNT_WAIT); 1210 MNT_ILOCK(mp); 1211 async_flag = mp->mnt_flag & MNT_ASYNC; 1212 mp->mnt_flag &= ~MNT_ASYNC; 1213 MNT_IUNLOCK(mp); 1214 cache_purgevfs(mp); /* remove cache entries for this file sys */ 1215 if (mp->mnt_syncer != NULL) 1216 vrele(mp->mnt_syncer); 1217 /* 1218 * For forced unmounts, move process cdir/rdir refs on the fs root 1219 * vnode to the covered vnode. For non-forced unmounts we want 1220 * such references to cause an EBUSY error. 1221 */ 1222 if ((flags & MNT_FORCE) && 1223 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1224 if (mp->mnt_vnodecovered != NULL) 1225 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered); 1226 if (fsrootvp == rootvnode) { 1227 vrele(rootvnode); 1228 rootvnode = NULL; 1229 } 1230 vput(fsrootvp); 1231 } 1232 if (((mp->mnt_flag & MNT_RDONLY) || 1233 (error = VFS_SYNC(mp, MNT_WAIT, td)) == 0) || 1234 (flags & MNT_FORCE)) { 1235 error = VFS_UNMOUNT(mp, flags, td); 1236 } 1237 vn_finished_write(mp); 1238 if (error) { 1239 /* Undo cdir/rdir and rootvnode changes made above. */ 1240 if ((flags & MNT_FORCE) && 1241 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp, td) == 0) { 1242 if (mp->mnt_vnodecovered != NULL) 1243 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp); 1244 if (rootvnode == NULL) { 1245 rootvnode = fsrootvp; 1246 vref(rootvnode); 1247 } 1248 vput(fsrootvp); 1249 } 1250 if ((mp->mnt_flag & MNT_RDONLY) == 0 && mp->mnt_syncer == NULL) 1251 (void) vfs_allocate_syncvnode(mp); 1252 MNT_ILOCK(mp); 1253 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF); 1254 mp->mnt_flag |= async_flag; 1255 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1256 if (mp->mnt_kern_flag & MNTK_MWAIT) 1257 wakeup(mp); 1258 MNT_IUNLOCK(mp); 1259 if (coveredvp) 1260 VOP_UNLOCK(coveredvp, 0, td); 1261 return (error); 1262 } 1263 mtx_lock(&mountlist_mtx); 1264 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1265 mtx_unlock(&mountlist_mtx); 1266 if (coveredvp != NULL) { 1267 coveredvp->v_mountedhere = NULL; 1268 vput(coveredvp); 1269 } 1270 vfs_event_signal(NULL, VQ_UNMOUNT, 0); 1271 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 1272 vfs_mount_destroy(mp); 1273 return (0); 1274 } 1275 1276 /* 1277 * --------------------------------------------------------------------- 1278 * Mounting of root filesystem 1279 * 1280 */ 1281 1282 struct root_hold_token { 1283 const char *who; 1284 LIST_ENTRY(root_hold_token) list; 1285 }; 1286 1287 static LIST_HEAD(, root_hold_token) root_holds = 1288 LIST_HEAD_INITIALIZER(&root_holds); 1289 1290 struct root_hold_token * 1291 root_mount_hold(const char *identifier) 1292 { 1293 struct root_hold_token *h; 1294 1295 h = malloc(sizeof *h, M_DEVBUF, M_ZERO | M_WAITOK); 1296 h->who = identifier; 1297 mtx_lock(&mountlist_mtx); 1298 LIST_INSERT_HEAD(&root_holds, h, list); 1299 mtx_unlock(&mountlist_mtx); 1300 return (h); 1301 } 1302 1303 void 1304 root_mount_rel(struct root_hold_token *h) 1305 { 1306 1307 mtx_lock(&mountlist_mtx); 1308 LIST_REMOVE(h, list); 1309 wakeup(&root_holds); 1310 mtx_unlock(&mountlist_mtx); 1311 free(h, M_DEVBUF); 1312 } 1313 1314 static void 1315 root_mount_wait(void) 1316 { 1317 struct root_hold_token *h; 1318 1319 for (;;) { 1320 DROP_GIANT(); 1321 g_waitidle(); 1322 PICKUP_GIANT(); 1323 mtx_lock(&mountlist_mtx); 1324 if (LIST_EMPTY(&root_holds)) { 1325 mtx_unlock(&mountlist_mtx); 1326 break; 1327 } 1328 printf("Root mount waiting for:"); 1329 LIST_FOREACH(h, &root_holds, list) 1330 printf(" %s", h->who); 1331 printf("\n"); 1332 msleep(&root_holds, &mountlist_mtx, PZERO | PDROP, "roothold", 1333 hz); 1334 } 1335 } 1336 1337 static void 1338 set_rootvnode(struct thread *td) 1339 { 1340 struct proc *p; 1341 1342 if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode, td)) 1343 panic("Cannot find root vnode"); 1344 1345 p = td->td_proc; 1346 FILEDESC_LOCK(p->p_fd); 1347 1348 if (p->p_fd->fd_cdir != NULL) 1349 vrele(p->p_fd->fd_cdir); 1350 p->p_fd->fd_cdir = rootvnode; 1351 VREF(rootvnode); 1352 1353 if (p->p_fd->fd_rdir != NULL) 1354 vrele(p->p_fd->fd_rdir); 1355 p->p_fd->fd_rdir = rootvnode; 1356 VREF(rootvnode); 1357 1358 FILEDESC_UNLOCK(p->p_fd); 1359 1360 VOP_UNLOCK(rootvnode, 0, td); 1361 } 1362 1363 /* 1364 * Mount /devfs as our root filesystem, but do not put it on the mountlist 1365 * yet. Create a /dev -> / symlink so that absolute pathnames will lookup. 1366 */ 1367 1368 static void 1369 devfs_first(void) 1370 { 1371 struct thread *td = curthread; 1372 struct vfsoptlist *opts; 1373 struct vfsconf *vfsp; 1374 struct mount *mp = NULL; 1375 int error; 1376 1377 vfsp = vfs_byname("devfs"); 1378 KASSERT(vfsp != NULL, ("Could not find devfs by name")); 1379 if (vfsp == NULL) 1380 return; 1381 1382 error = vfs_mount_alloc(NULLVP, vfsp, "/dev", td, &mp); 1383 KASSERT(error == 0, ("vfs_mount_alloc failed %d", error)); 1384 if (error) 1385 return; 1386 1387 error = VFS_MOUNT(mp, curthread); 1388 KASSERT(error == 0, ("VFS_MOUNT(devfs) failed %d", error)); 1389 if (error) 1390 return; 1391 1392 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK); 1393 TAILQ_INIT(opts); 1394 mp->mnt_opt = opts; 1395 1396 mtx_lock(&mountlist_mtx); 1397 TAILQ_INSERT_HEAD(&mountlist, mp, mnt_list); 1398 mtx_unlock(&mountlist_mtx); 1399 1400 set_rootvnode(td); 1401 1402 error = kern_symlink(td, "/", "dev", UIO_SYSSPACE); 1403 if (error) 1404 printf("kern_symlink /dev -> / returns %d\n", error); 1405 } 1406 1407 /* 1408 * Surgically move our devfs to be mounted on /dev. 1409 */ 1410 1411 static void 1412 devfs_fixup(struct thread *td) 1413 { 1414 struct nameidata nd; 1415 int error; 1416 struct vnode *vp, *dvp; 1417 struct mount *mp; 1418 1419 /* Remove our devfs mount from the mountlist and purge the cache */ 1420 mtx_lock(&mountlist_mtx); 1421 mp = TAILQ_FIRST(&mountlist); 1422 TAILQ_REMOVE(&mountlist, mp, mnt_list); 1423 mtx_unlock(&mountlist_mtx); 1424 cache_purgevfs(mp); 1425 1426 VFS_ROOT(mp, LK_EXCLUSIVE, &dvp, td); 1427 VI_LOCK(dvp); 1428 dvp->v_iflag &= ~VI_MOUNT; 1429 dvp->v_mountedhere = NULL; 1430 VI_UNLOCK(dvp); 1431 1432 /* Set up the real rootvnode, and purge the cache */ 1433 TAILQ_FIRST(&mountlist)->mnt_vnodecovered = NULL; 1434 set_rootvnode(td); 1435 cache_purgevfs(rootvnode->v_mount); 1436 1437 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, "/dev", td); 1438 error = namei(&nd); 1439 if (error) { 1440 printf("Lookup of /dev for devfs, error: %d\n", error); 1441 return; 1442 } 1443 NDFREE(&nd, NDF_ONLY_PNBUF); 1444 vp = nd.ni_vp; 1445 if (vp->v_type != VDIR) { 1446 vput(vp); 1447 } 1448 error = vinvalbuf(vp, V_SAVE, td, 0, 0); 1449 if (error) { 1450 vput(vp); 1451 } 1452 cache_purge(vp); 1453 mp->mnt_vnodecovered = vp; 1454 vp->v_mountedhere = mp; 1455 mtx_lock(&mountlist_mtx); 1456 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 1457 mtx_unlock(&mountlist_mtx); 1458 VOP_UNLOCK(vp, 0, td); 1459 vput(dvp); 1460 vfs_unbusy(mp, td); 1461 1462 /* Unlink the no longer needed /dev/dev -> / symlink */ 1463 kern_unlink(td, "/dev/dev", UIO_SYSSPACE); 1464 } 1465 1466 /* 1467 * Report errors during filesystem mounting. 1468 */ 1469 void 1470 vfs_mount_error(struct mount *mp, const char *fmt, ...) 1471 { 1472 struct vfsoptlist *moptlist = mp->mnt_optnew; 1473 va_list ap; 1474 int error, len; 1475 char *errmsg; 1476 1477 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len); 1478 if (error || errmsg == NULL || len <= 0) { 1479 return; 1480 } 1481 1482 va_start(ap, fmt); 1483 vsnprintf(errmsg, (size_t)len, fmt, ap); 1484 va_end(ap); 1485 } 1486 1487 /* 1488 * Find and mount the root filesystem 1489 */ 1490 void 1491 vfs_mountroot(void) 1492 { 1493 char *cp; 1494 int error, i, asked = 0; 1495 1496 root_mount_wait(); 1497 1498 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), 1499 NULL, NULL, mount_init, mount_fini, 1500 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 1501 devfs_first(); 1502 1503 /* 1504 * We are booted with instructions to prompt for the root filesystem. 1505 */ 1506 if (boothowto & RB_ASKNAME) { 1507 if (!vfs_mountroot_ask()) 1508 return; 1509 asked = 1; 1510 } 1511 1512 /* 1513 * The root filesystem information is compiled in, and we are 1514 * booted with instructions to use it. 1515 */ 1516 if (ctrootdevname != NULL && (boothowto & RB_DFLTROOT)) { 1517 if (!vfs_mountroot_try(ctrootdevname)) 1518 return; 1519 ctrootdevname = NULL; 1520 } 1521 1522 /* 1523 * We've been given the generic "use CDROM as root" flag. This is 1524 * necessary because one media may be used in many different 1525 * devices, so we need to search for them. 1526 */ 1527 if (boothowto & RB_CDROM) { 1528 for (i = 0; cdrom_rootdevnames[i] != NULL; i++) { 1529 if (!vfs_mountroot_try(cdrom_rootdevnames[i])) 1530 return; 1531 } 1532 } 1533 1534 /* 1535 * Try to use the value read by the loader from /etc/fstab, or 1536 * supplied via some other means. This is the preferred 1537 * mechanism. 1538 */ 1539 cp = getenv("vfs.root.mountfrom"); 1540 if (cp != NULL) { 1541 error = vfs_mountroot_try(cp); 1542 freeenv(cp); 1543 if (!error) 1544 return; 1545 } 1546 1547 /* 1548 * Try values that may have been computed by code during boot 1549 */ 1550 if (!vfs_mountroot_try(rootdevnames[0])) 1551 return; 1552 if (!vfs_mountroot_try(rootdevnames[1])) 1553 return; 1554 1555 /* 1556 * If we (still) have a compiled-in default, try it. 1557 */ 1558 if (ctrootdevname != NULL) 1559 if (!vfs_mountroot_try(ctrootdevname)) 1560 return; 1561 /* 1562 * Everything so far has failed, prompt on the console if we haven't 1563 * already tried that. 1564 */ 1565 if (!asked) 1566 if (!vfs_mountroot_ask()) 1567 return; 1568 1569 panic("Root mount failed, startup aborted."); 1570 } 1571 1572 /* 1573 * Mount (mountfrom) as the root filesystem. 1574 */ 1575 static int 1576 vfs_mountroot_try(const char *mountfrom) 1577 { 1578 struct mount *mp; 1579 char *vfsname, *path; 1580 time_t timebase; 1581 int error; 1582 char patt[32]; 1583 1584 vfsname = NULL; 1585 path = NULL; 1586 mp = NULL; 1587 error = EINVAL; 1588 1589 if (mountfrom == NULL) 1590 return (error); /* don't complain */ 1591 printf("Trying to mount root from %s\n", mountfrom); 1592 1593 /* parse vfs name and path */ 1594 vfsname = malloc(MFSNAMELEN, M_MOUNT, M_WAITOK); 1595 path = malloc(MNAMELEN, M_MOUNT, M_WAITOK); 1596 vfsname[0] = path[0] = 0; 1597 sprintf(patt, "%%%d[a-z0-9]:%%%ds", MFSNAMELEN, MNAMELEN); 1598 if (sscanf(mountfrom, patt, vfsname, path) < 1) 1599 goto out; 1600 1601 if (path[0] == '\0') 1602 strcpy(path, ROOTNAME); 1603 1604 error = kernel_vmount( 1605 MNT_RDONLY | MNT_ROOTFS, 1606 "fstype", vfsname, 1607 "fspath", "/", 1608 "from", path, 1609 NULL); 1610 if (error == 0) { 1611 /* 1612 * We mount devfs prior to mounting the / FS, so the first 1613 * entry will typically be devfs. 1614 */ 1615 mp = TAILQ_FIRST(&mountlist); 1616 KASSERT(mp != NULL, ("%s: mountlist is empty", __func__)); 1617 1618 /* 1619 * Iterate over all currently mounted file systems and use 1620 * the time stamp found to check and/or initialize the RTC. 1621 * Typically devfs has no time stamp and the only other FS 1622 * is the actual / FS. 1623 * Call inittodr() only once and pass it the largest of the 1624 * timestamps we encounter. 1625 */ 1626 timebase = 0; 1627 do { 1628 if (mp->mnt_time > timebase) 1629 timebase = mp->mnt_time; 1630 mp = TAILQ_NEXT(mp, mnt_list); 1631 } while (mp != NULL); 1632 inittodr(timebase); 1633 1634 devfs_fixup(curthread); 1635 } 1636 out: 1637 free(path, M_MOUNT); 1638 free(vfsname, M_MOUNT); 1639 return (error); 1640 } 1641 1642 /* 1643 * --------------------------------------------------------------------- 1644 * Interactive root filesystem selection code. 1645 */ 1646 1647 static int 1648 vfs_mountroot_ask(void) 1649 { 1650 char name[128]; 1651 1652 for(;;) { 1653 printf("\nManual root filesystem specification:\n"); 1654 printf(" <fstype>:<device> Mount <device> using filesystem <fstype>\n"); 1655 #if defined(__i386__) || defined(__ia64__) 1656 printf(" eg. ufs:da0s1a\n"); 1657 #else 1658 printf(" eg. ufs:/dev/da0a\n"); 1659 #endif 1660 printf(" ? List valid disk boot devices\n"); 1661 printf(" <empty line> Abort manual input\n"); 1662 printf("\nmountroot> "); 1663 gets(name, sizeof(name), 1); 1664 if (name[0] == '\0') 1665 return (1); 1666 if (name[0] == '?') { 1667 printf("\nList of GEOM managed disk devices:\n "); 1668 g_dev_print(); 1669 continue; 1670 } 1671 if (!vfs_mountroot_try(name)) 1672 return (0); 1673 } 1674 } 1675 1676 /* 1677 * --------------------------------------------------------------------- 1678 * Functions for querying mount options/arguments from filesystems. 1679 */ 1680 1681 /* 1682 * Check that no unknown options are given 1683 */ 1684 int 1685 vfs_filteropt(struct vfsoptlist *opts, const char **legal) 1686 { 1687 struct vfsopt *opt; 1688 const char **t, *p; 1689 1690 1691 TAILQ_FOREACH(opt, opts, link) { 1692 p = opt->name; 1693 if (p[0] == 'n' && p[1] == 'o') 1694 p += 2; 1695 for(t = global_opts; *t != NULL; t++) 1696 if (!strcmp(*t, p)) 1697 break; 1698 if (*t != NULL) 1699 continue; 1700 for(t = legal; *t != NULL; t++) 1701 if (!strcmp(*t, p)) 1702 break; 1703 if (*t != NULL) 1704 continue; 1705 printf("mount option <%s> is unknown\n", p); 1706 return (EINVAL); 1707 } 1708 return (0); 1709 } 1710 1711 /* 1712 * Get a mount option by its name. 1713 * 1714 * Return 0 if the option was found, ENOENT otherwise. 1715 * If len is non-NULL it will be filled with the length 1716 * of the option. If buf is non-NULL, it will be filled 1717 * with the address of the option. 1718 */ 1719 int 1720 vfs_getopt(opts, name, buf, len) 1721 struct vfsoptlist *opts; 1722 const char *name; 1723 void **buf; 1724 int *len; 1725 { 1726 struct vfsopt *opt; 1727 1728 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1729 1730 TAILQ_FOREACH(opt, opts, link) { 1731 if (strcmp(name, opt->name) == 0) { 1732 if (len != NULL) 1733 *len = opt->len; 1734 if (buf != NULL) 1735 *buf = opt->value; 1736 return (0); 1737 } 1738 } 1739 return (ENOENT); 1740 } 1741 1742 static int 1743 vfs_getopt_pos(struct vfsoptlist *opts, const char *name) 1744 { 1745 struct vfsopt *opt; 1746 int i; 1747 1748 if (opts == NULL) 1749 return (-1); 1750 1751 i = 0; 1752 TAILQ_FOREACH(opt, opts, link) { 1753 if (strcmp(name, opt->name) == 0) 1754 return (i); 1755 ++i; 1756 } 1757 return (-1); 1758 } 1759 1760 char * 1761 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error) 1762 { 1763 struct vfsopt *opt; 1764 1765 *error = 0; 1766 TAILQ_FOREACH(opt, opts, link) { 1767 if (strcmp(name, opt->name) != 0) 1768 continue; 1769 if (((char *)opt->value)[opt->len - 1] != '\0') { 1770 *error = EINVAL; 1771 return (NULL); 1772 } 1773 return (opt->value); 1774 } 1775 return (NULL); 1776 } 1777 1778 int 1779 vfs_flagopt(struct vfsoptlist *opts, const char *name, u_int *w, u_int val) 1780 { 1781 struct vfsopt *opt; 1782 1783 TAILQ_FOREACH(opt, opts, link) { 1784 if (strcmp(name, opt->name) == 0) { 1785 if (w != NULL) 1786 *w |= val; 1787 return (1); 1788 } 1789 } 1790 if (w != NULL) 1791 *w &= ~val; 1792 return (0); 1793 } 1794 1795 int 1796 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...) 1797 { 1798 va_list ap; 1799 struct vfsopt *opt; 1800 int ret; 1801 1802 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL")); 1803 1804 TAILQ_FOREACH(opt, opts, link) { 1805 if (strcmp(name, opt->name) != 0) 1806 continue; 1807 if (((char *)opt->value)[opt->len - 1] != '\0') 1808 return (0); 1809 va_start(ap, fmt); 1810 ret = vsscanf(opt->value, fmt, ap); 1811 va_end(ap); 1812 return (ret); 1813 } 1814 return (0); 1815 } 1816 1817 /* 1818 * Find and copy a mount option. 1819 * 1820 * The size of the buffer has to be specified 1821 * in len, if it is not the same length as the 1822 * mount option, EINVAL is returned. 1823 * Returns ENOENT if the option is not found. 1824 */ 1825 int 1826 vfs_copyopt(opts, name, dest, len) 1827 struct vfsoptlist *opts; 1828 const char *name; 1829 void *dest; 1830 int len; 1831 { 1832 struct vfsopt *opt; 1833 1834 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL")); 1835 1836 TAILQ_FOREACH(opt, opts, link) { 1837 if (strcmp(name, opt->name) == 0) { 1838 if (len != opt->len) 1839 return (EINVAL); 1840 bcopy(opt->value, dest, opt->len); 1841 return (0); 1842 } 1843 } 1844 return (ENOENT); 1845 } 1846 1847 /* 1848 * This is a helper function for filesystems to traverse their 1849 * vnodes. See MNT_VNODE_FOREACH() in sys/mount.h 1850 */ 1851 1852 struct vnode * 1853 __mnt_vnode_next(struct vnode **mvp, struct mount *mp) 1854 { 1855 struct vnode *vp; 1856 1857 mtx_assert(MNT_MTX(mp), MA_OWNED); 1858 1859 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1860 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 1861 while (vp != NULL && vp->v_type == VMARKER) 1862 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1863 1864 /* Check if we are done */ 1865 if (vp == NULL) { 1866 __mnt_vnode_markerfree(mvp, mp); 1867 return (NULL); 1868 } 1869 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1870 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1871 return (vp); 1872 } 1873 1874 struct vnode * 1875 __mnt_vnode_first(struct vnode **mvp, struct mount *mp) 1876 { 1877 struct vnode *vp; 1878 1879 mtx_assert(MNT_MTX(mp), MA_OWNED); 1880 1881 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1882 while (vp != NULL && vp->v_type == VMARKER) 1883 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1884 1885 /* Check if we are done */ 1886 if (vp == NULL) { 1887 *mvp = NULL; 1888 return (NULL); 1889 } 1890 mp->mnt_holdcnt++; 1891 MNT_IUNLOCK(mp); 1892 *mvp = (struct vnode *) malloc(sizeof(struct vnode), 1893 M_VNODE_MARKER, 1894 M_WAITOK | M_ZERO); 1895 MNT_ILOCK(mp); 1896 (*mvp)->v_type = VMARKER; 1897 1898 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1899 while (vp != NULL && vp->v_type == VMARKER) 1900 vp = TAILQ_NEXT(vp, v_nmntvnodes); 1901 1902 /* Check if we are done */ 1903 if (vp == NULL) { 1904 MNT_IUNLOCK(mp); 1905 free(*mvp, M_VNODE_MARKER); 1906 MNT_ILOCK(mp); 1907 *mvp = NULL; 1908 mp->mnt_holdcnt--; 1909 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1910 wakeup(&mp->mnt_holdcnt); 1911 return (NULL); 1912 } 1913 mp->mnt_markercnt++; 1914 (*mvp)->v_mount = mp; 1915 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 1916 return (vp); 1917 } 1918 1919 1920 void 1921 __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp) 1922 { 1923 1924 if (*mvp == NULL) 1925 return; 1926 1927 mtx_assert(MNT_MTX(mp), MA_OWNED); 1928 1929 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 1930 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 1931 MNT_IUNLOCK(mp); 1932 free(*mvp, M_VNODE_MARKER); 1933 MNT_ILOCK(mp); 1934 *mvp = NULL; 1935 1936 mp->mnt_markercnt--; 1937 mp->mnt_holdcnt--; 1938 if (mp->mnt_holdcnt == 0 && mp->mnt_holdcntwaiters != 0) 1939 wakeup(&mp->mnt_holdcnt); 1940 } 1941 1942 1943 int 1944 __vfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 1945 { 1946 int error; 1947 1948 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat, td); 1949 if (sbp != &mp->mnt_stat) 1950 *sbp = mp->mnt_stat; 1951 return (error); 1952 } 1953 1954 void 1955 vfs_mountedfrom(struct mount *mp, const char *from) 1956 { 1957 1958 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname); 1959 strlcpy(mp->mnt_stat.f_mntfromname, from, 1960 sizeof mp->mnt_stat.f_mntfromname); 1961 } 1962 1963 /* 1964 * --------------------------------------------------------------------- 1965 * This is the api for building mount args and mounting filesystems from 1966 * inside the kernel. 1967 * 1968 * The API works by accumulation of individual args. First error is 1969 * latched. 1970 * 1971 * XXX: should be documented in new manpage kernel_mount(9) 1972 */ 1973 1974 /* A memory allocation which must be freed when we are done */ 1975 struct mntaarg { 1976 SLIST_ENTRY(mntaarg) next; 1977 }; 1978 1979 /* The header for the mount arguments */ 1980 struct mntarg { 1981 struct iovec *v; 1982 int len; 1983 int error; 1984 SLIST_HEAD(, mntaarg) list; 1985 }; 1986 1987 /* 1988 * Add a boolean argument. 1989 * 1990 * flag is the boolean value. 1991 * name must start with "no". 1992 */ 1993 struct mntarg * 1994 mount_argb(struct mntarg *ma, int flag, const char *name) 1995 { 1996 1997 KASSERT(name[0] == 'n' && name[1] == 'o', 1998 ("mount_argb(...,%s): name must start with 'no'", name)); 1999 2000 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0)); 2001 } 2002 2003 /* 2004 * Add an argument printf style 2005 */ 2006 struct mntarg * 2007 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...) 2008 { 2009 va_list ap; 2010 struct mntaarg *maa; 2011 struct sbuf *sb; 2012 int len; 2013 2014 if (ma == NULL) { 2015 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2016 SLIST_INIT(&ma->list); 2017 } 2018 if (ma->error) 2019 return (ma); 2020 2021 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2022 M_MOUNT, M_WAITOK); 2023 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2024 ma->v[ma->len].iov_len = strlen(name) + 1; 2025 ma->len++; 2026 2027 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 2028 va_start(ap, fmt); 2029 sbuf_vprintf(sb, fmt, ap); 2030 va_end(ap); 2031 sbuf_finish(sb); 2032 len = sbuf_len(sb) + 1; 2033 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2034 SLIST_INSERT_HEAD(&ma->list, maa, next); 2035 bcopy(sbuf_data(sb), maa + 1, len); 2036 sbuf_delete(sb); 2037 2038 ma->v[ma->len].iov_base = maa + 1; 2039 ma->v[ma->len].iov_len = len; 2040 ma->len++; 2041 2042 return (ma); 2043 } 2044 2045 /* 2046 * Add an argument which is a userland string. 2047 */ 2048 struct mntarg * 2049 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len) 2050 { 2051 struct mntaarg *maa; 2052 char *tbuf; 2053 2054 if (val == NULL) 2055 return (ma); 2056 if (ma == NULL) { 2057 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2058 SLIST_INIT(&ma->list); 2059 } 2060 if (ma->error) 2061 return (ma); 2062 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO); 2063 SLIST_INSERT_HEAD(&ma->list, maa, next); 2064 tbuf = (void *)(maa + 1); 2065 ma->error = copyinstr(val, tbuf, len, NULL); 2066 return (mount_arg(ma, name, tbuf, -1)); 2067 } 2068 2069 /* 2070 * Plain argument. 2071 * 2072 * If length is -1, use printf. 2073 */ 2074 struct mntarg * 2075 mount_arg(struct mntarg *ma, const char *name, const void *val, int len) 2076 { 2077 2078 if (ma == NULL) { 2079 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO); 2080 SLIST_INIT(&ma->list); 2081 } 2082 if (ma->error) 2083 return (ma); 2084 2085 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2), 2086 M_MOUNT, M_WAITOK); 2087 ma->v[ma->len].iov_base = (void *)(uintptr_t)name; 2088 ma->v[ma->len].iov_len = strlen(name) + 1; 2089 ma->len++; 2090 2091 ma->v[ma->len].iov_base = (void *)(uintptr_t)val; 2092 if (len < 0) 2093 ma->v[ma->len].iov_len = strlen(val) + 1; 2094 else 2095 ma->v[ma->len].iov_len = len; 2096 ma->len++; 2097 return (ma); 2098 } 2099 2100 /* 2101 * Free a mntarg structure 2102 */ 2103 static void 2104 free_mntarg(struct mntarg *ma) 2105 { 2106 struct mntaarg *maa; 2107 2108 while (!SLIST_EMPTY(&ma->list)) { 2109 maa = SLIST_FIRST(&ma->list); 2110 SLIST_REMOVE_HEAD(&ma->list, next); 2111 free(maa, M_MOUNT); 2112 } 2113 free(ma->v, M_MOUNT); 2114 free(ma, M_MOUNT); 2115 } 2116 2117 /* 2118 * Mount a filesystem 2119 */ 2120 int 2121 kernel_mount(struct mntarg *ma, int flags) 2122 { 2123 struct uio auio; 2124 int error; 2125 2126 KASSERT(ma != NULL, ("kernel_mount NULL ma")); 2127 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v")); 2128 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len)); 2129 2130 auio.uio_iov = ma->v; 2131 auio.uio_iovcnt = ma->len; 2132 auio.uio_segflg = UIO_SYSSPACE; 2133 2134 error = ma->error; 2135 if (!error) 2136 error = vfs_donmount(curthread, flags, &auio); 2137 free_mntarg(ma); 2138 return (error); 2139 } 2140 2141 /* 2142 * A printflike function to mount a filesystem. 2143 */ 2144 int 2145 kernel_vmount(int flags, ...) 2146 { 2147 struct mntarg *ma = NULL; 2148 va_list ap; 2149 const char *cp; 2150 const void *vp; 2151 int error; 2152 2153 va_start(ap, flags); 2154 for (;;) { 2155 cp = va_arg(ap, const char *); 2156 if (cp == NULL) 2157 break; 2158 vp = va_arg(ap, const void *); 2159 ma = mount_arg(ma, cp, vp, -1); 2160 } 2161 va_end(ap); 2162 2163 error = kernel_mount(ma, flags); 2164 return (error); 2165 }
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