1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley 6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 7 * Support code is derived from software contributed to Berkeley 8 * by Atsushi Murai (amurai@spec.co.jp). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95 35 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/caps.h> 42 #include <sys/nlookup.h> 43 #include <sys/kernel.h> 44 #include <sys/vnode.h> 45 #include <sys/mount.h> 46 #include <sys/buf.h> 47 #include <sys/cdio.h> 48 #include <sys/conf.h> 49 #include <sys/fcntl.h> 50 #include <sys/malloc.h> 51 #include <sys/stat.h> 52 #include <sys/syslog.h> 53 #include <sys/iconv.h> 54 55 #include <vm/vm_zone.h> 56 57 #include <sys/buf2.h> 58 59 #include "iso.h" 60 #include "iso_rrip.h" 61 #include "cd9660_node.h" 62 #include "cd9660_mount.h" 63 64 extern struct vop_ops cd9660_vnode_vops; 65 extern struct vop_ops cd9660_spec_vops; 66 extern struct vop_ops cd9660_fifo_vops; 67 68 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure"); 69 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part"); 70 71 struct iconv_functions *cd9660_iconv = NULL; 72 73 static int cd9660_mount(struct mount *, char *, caddr_t, struct ucred *); 74 static int cd9660_unmount(struct mount *, int); 75 static int cd9660_root(struct mount *, struct vnode **); 76 static int cd9660_statfs(struct mount *, struct statfs *, struct ucred *); 77 static int cd9660_vget(struct mount *, struct vnode *, ino_t, struct vnode **); 78 static int cd9660_fhtovp(struct mount *, struct vnode *rootvp, 79 struct fid *, struct vnode **); 80 static int cd9660_checkexp(struct mount *, struct sockaddr *, 81 int *, struct ucred **); 82 static int cd9660_vptofh (struct vnode *, struct fid *); 83 84 static struct vfsops cd9660_vfsops = { 85 .vfs_flags = 0, 86 .vfs_mount = cd9660_mount, 87 .vfs_unmount = cd9660_unmount, 88 .vfs_root = cd9660_root, 89 .vfs_statfs = cd9660_statfs, 90 .vfs_vget = cd9660_vget, 91 .vfs_fhtovp = cd9660_fhtovp, 92 .vfs_checkexp = cd9660_checkexp, 93 .vfs_vptofh = cd9660_vptofh, 94 .vfs_init = cd9660_init, 95 .vfs_uninit = cd9660_uninit, 96 }; 97 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY); 98 MODULE_VERSION(cd9660, 1); 99 100 101 /* 102 * Called by vfs_mountroot when iso is going to be mounted as root. 103 */ 104 105 static int iso_get_ssector(cdev_t dev); 106 static int iso_mountfs(struct vnode *devvp, struct mount *mp, 107 struct iso_args *argp); 108 109 /* 110 * Try to find the start of the last data track on this CD-ROM. This 111 * is used to mount the last session of a multi-session CD. Bail out 112 * and return 0 if we fail, this is always a safe bet. 113 */ 114 static int 115 iso_get_ssector(cdev_t dev) 116 { 117 struct ioc_toc_header h; 118 struct ioc_read_toc_single_entry t; 119 int i; 120 121 if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD, 122 proc0.p_ucred, NULL, NULL) != 0) 123 return 0; 124 125 for (i = h.ending_track; i >= 0; i--) { 126 t.address_format = CD_LBA_FORMAT; 127 t.track = i; 128 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD, 129 proc0.p_ucred, NULL, NULL) != 0) { 130 return 0; 131 } 132 if ((t.entry.control & 4) != 0) 133 /* found a data track */ 134 break; 135 } 136 137 if (i < 0) 138 return 0; 139 140 return ntohl(t.entry.addr.lba); 141 } 142 143 static int 144 iso_mountroot(struct mount *mp) 145 { 146 struct iso_args args; 147 struct vnode *rootvp; 148 int error; 149 150 if ((error = bdevvp(rootdev, &rootvp))) { 151 kprintf("iso_mountroot: can't find rootvp\n"); 152 return (error); 153 } 154 args.flags = ISOFSMNT_ROOT; 155 156 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY); 157 error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL); 158 vn_unlock(rootvp); 159 if (error) 160 return (error); 161 162 args.ssector = iso_get_ssector(rootdev); 163 164 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY); 165 VOP_CLOSE(rootvp, FREAD, NULL); 166 vn_unlock(rootvp); 167 168 if (bootverbose) 169 kprintf("iso_mountroot(): using session at block %d\n", 170 args.ssector); 171 if ((error = iso_mountfs(rootvp, mp, &args)) != 0) 172 return (error); 173 174 cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred); 175 return (0); 176 } 177 178 /* 179 * VFS Operations. 180 * 181 * mount system call 182 */ 183 static int 184 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 185 { 186 struct vnode *devvp; 187 struct iso_args args; 188 size_t size; 189 int error; 190 mode_t accessmode; 191 struct iso_mnt *imp = NULL; 192 struct nlookupdata nd; 193 194 if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) { 195 return (iso_mountroot(mp)); 196 } 197 if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args)))) 198 return (error); 199 200 if ((mp->mnt_flag & MNT_RDONLY) == 0) 201 return (EROFS); 202 203 /* 204 * If updating, check whether changing from read-only to 205 * read/write; if there is no device name, that's all we do. 206 */ 207 if (mp->mnt_flag & MNT_UPDATE) { 208 imp = VFSTOISOFS(mp); 209 if (args.fspec == NULL) 210 return (vfs_export(mp, &imp->im_export, &args.export)); 211 } 212 /* 213 * Not an update, or updating the name: look up the name 214 * and verify that it refers to a sensible block device. 215 */ 216 devvp = NULL; 217 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 218 if (error == 0) 219 error = nlookup(&nd); 220 if (error == 0) 221 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 222 nlookup_done(&nd); 223 if (error) 224 return (error); 225 226 if (!vn_isdisk(devvp, &error)) { 227 vrele(devvp); 228 return (error); 229 } 230 231 /* 232 * Verify that user has necessary permissions on the device, 233 * or has superuser abilities 234 */ 235 accessmode = VREAD; 236 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 237 error = VOP_EACCESS(devvp, accessmode, cred); 238 if (error) 239 error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT); 240 if (error) { 241 vput(devvp); 242 return (error); 243 } 244 vn_unlock(devvp); 245 246 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 247 error = iso_mountfs(devvp, mp, &args); 248 } else { 249 if (devvp != imp->im_devvp) 250 error = EINVAL; /* needs translation */ 251 else 252 vrele(devvp); 253 } 254 if (error) { 255 vrele(devvp); 256 return error; 257 } 258 imp = VFSTOISOFS(mp); 259 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 260 &size); 261 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 262 cd9660_statfs(mp, &mp->mnt_stat, cred); 263 return 0; 264 } 265 266 /* 267 * Common code for mount and mountroot 268 */ 269 static int 270 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp) 271 { 272 struct iso_mnt *isomp = NULL; 273 struct buf *bp = NULL; 274 struct buf *pribp = NULL, *supbp = NULL; 275 cdev_t dev; 276 int error = EINVAL; 277 int needclose = 0; 278 int high_sierra = 0; 279 int iso_bsize; 280 int iso_blknum; 281 int joliet_level; 282 struct iso_volume_descriptor *vdp = NULL; 283 struct iso_primary_descriptor *pri = NULL; 284 struct iso_sierra_primary_descriptor *pri_sierra = NULL; 285 struct iso_supplementary_descriptor *sup = NULL; 286 struct iso_directory_record *rootp; 287 int logical_block_size; 288 char cs_local[ICONV_CSNMAXLEN]; 289 char cs_disk[ICONV_CSNMAXLEN]; 290 291 if (!(mp->mnt_flag & MNT_RDONLY)) 292 return EROFS; 293 294 /* 295 * Disallow multiple mounts of the same device. 296 * Disallow mounting of a device that is currently in use 297 * Flush out any old buffers remaining from a previous use. 298 */ 299 if ((error = vfs_mountedon(devvp))) 300 return error; 301 if (vcount(devvp) > 0) 302 return EBUSY; 303 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0))) 304 return (error); 305 306 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 307 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL); 308 vn_unlock(devvp); 309 if (error) 310 return error; 311 dev = devvp->v_rdev; 312 if (dev->si_iosize_max != 0) 313 mp->mnt_iosize_max = dev->si_iosize_max; 314 if (mp->mnt_iosize_max > MAXPHYS) 315 mp->mnt_iosize_max = MAXPHYS; 316 317 needclose = 1; 318 319 /* This is the "logical sector size". The standard says this 320 * should be 2048 or the physical sector size on the device, 321 * whichever is greater. For now, we'll just use a constant. 322 */ 323 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 324 325 joliet_level = 0; 326 for (iso_blknum = 16 + argp->ssector; 327 iso_blknum < 100 + argp->ssector; 328 iso_blknum++) { 329 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize, 330 iso_bsize, &bp)) != 0) 331 goto out; 332 333 vdp = (struct iso_volume_descriptor *)bp->b_data; 334 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 335 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID, 336 sizeof vdp->id) != 0) { 337 error = EINVAL; 338 goto out; 339 } else 340 high_sierra = 1; 341 } 342 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){ 343 case ISO_VD_PRIMARY: 344 if (pribp == NULL) { 345 pribp = bp; 346 bp = NULL; 347 pri = (struct iso_primary_descriptor *)vdp; 348 pri_sierra = 349 (struct iso_sierra_primary_descriptor *)vdp; 350 } 351 break; 352 353 case ISO_VD_SUPPLEMENTARY: 354 if (supbp == NULL) { 355 supbp = bp; 356 bp = NULL; 357 sup = (struct iso_supplementary_descriptor *)vdp; 358 359 if (!(argp->flags & ISOFSMNT_NOJOLIET)) { 360 if (bcmp(sup->escape, "%/@", 3) == 0) 361 joliet_level = 1; 362 if (bcmp(sup->escape, "%/C", 3) == 0) 363 joliet_level = 2; 364 if (bcmp(sup->escape, "%/E", 3) == 0) 365 joliet_level = 3; 366 367 if ((isonum_711 (sup->flags) & 1) && 368 (argp->flags & ISOFSMNT_BROKENJOLIET) == 0) 369 joliet_level = 0; 370 } 371 } 372 break; 373 374 case ISO_VD_END: 375 goto vd_end; 376 377 default: 378 break; 379 } 380 if (bp) { 381 brelse(bp); 382 bp = NULL; 383 } 384 } 385 vd_end: 386 if (bp) { 387 brelse(bp); 388 bp = NULL; 389 } 390 391 if (pri == NULL) { 392 error = EINVAL; 393 goto out; 394 } 395 396 logical_block_size = 397 isonum_723 (high_sierra? 398 pri_sierra->logical_block_size: 399 pri->logical_block_size); 400 401 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 402 || (logical_block_size & (logical_block_size - 1)) != 0) { 403 error = EINVAL; 404 goto out; 405 } 406 407 rootp = (struct iso_directory_record *) 408 (high_sierra? 409 pri_sierra->root_directory_record: 410 pri->root_directory_record); 411 412 isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 413 isomp->logical_block_size = logical_block_size; 414 isomp->volume_space_size = 415 isonum_733 (high_sierra? 416 pri_sierra->volume_space_size: 417 pri->volume_space_size); 418 isomp->joliet_level = 0; 419 /* 420 * Since an ISO9660 multi-session CD can also access previous 421 * sessions, we have to include them into the space consider- 422 * ations. This doesn't yield a very accurate number since 423 * parts of the old sessions might be inaccessible now, but we 424 * can't do much better. This is also important for the NFS 425 * filehandle validation. 426 */ 427 isomp->volume_space_size += argp->ssector; 428 bcopy (rootp, isomp->root, sizeof isomp->root); 429 isomp->root_extent = isonum_733 (rootp->extent); 430 isomp->root_size = isonum_733 (rootp->size); 431 432 isomp->im_bmask = logical_block_size - 1; 433 isomp->im_bshift = ffs(logical_block_size) - 1; 434 435 pribp->b_flags |= B_AGE; 436 brelse(pribp); 437 pribp = NULL; 438 439 mp->mnt_data = (qaddr_t)isomp; 440 mp->mnt_stat.f_fsid.val[0] = devid_from_dev(dev); 441 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 442 mp->mnt_maxsymlinklen = 0; 443 mp->mnt_flag |= MNT_LOCAL; 444 isomp->im_mountp = mp; 445 isomp->im_dev = dev; 446 isomp->im_devvp = devvp; 447 448 dev->si_mountpoint = mp; 449 450 if (argp->flags & ISOFSMNT_UID) 451 isomp->im_uid = argp->uid; 452 if (argp->flags & ISOFSMNT_GID) 453 isomp->im_gid = argp->gid; 454 isomp->im_fmask = argp->fmask & ACCESSPERMS; 455 isomp->im_dmask = argp->dmask & ACCESSPERMS; 456 457 /* Check the Rock Ridge Extension support */ 458 if (!(argp->flags & ISOFSMNT_NORRIP)) { 459 if ((error = bread(isomp->im_devvp, 460 lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)), 461 isomp->logical_block_size, &bp)) != 0) 462 goto out; 463 464 rootp = (struct iso_directory_record *)bp->b_data; 465 466 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 467 argp->flags |= ISOFSMNT_NORRIP; 468 } else { 469 argp->flags &= ~ISOFSMNT_GENS; 470 } 471 472 /* 473 * The contents are valid, 474 * but they will get reread as part of another vnode, so... 475 */ 476 bp->b_flags |= B_AGE; 477 brelse(bp); 478 bp = NULL; 479 } 480 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 481 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | 482 ISOFSMNT_KICONV | 483 ISOFSMNT_UID | ISOFSMNT_GID); 484 485 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 486 bcopy(argp->cs_local, cs_local, sizeof(cs_local)); 487 bcopy(argp->cs_disk, cs_disk, sizeof(cs_disk)); 488 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 489 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 490 } else { 491 isomp->im_d2l = NULL; 492 isomp->im_l2d = NULL; 493 } 494 495 if (high_sierra) { 496 /* this effectively ignores all the mount flags */ 497 log(LOG_INFO, "cd9660: High Sierra Format\n"); 498 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 499 } else { 500 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 501 default: 502 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 503 break; 504 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 505 isomp->iso_ftype = ISO_FTYPE_9660; 506 break; 507 case 0: 508 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 509 isomp->iso_ftype = ISO_FTYPE_RRIP; 510 break; 511 } 512 } 513 514 /* Decide whether to use the Joliet descriptor */ 515 516 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 517 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level); 518 rootp = (struct iso_directory_record *) 519 sup->root_directory_record; 520 bcopy (rootp, isomp->root, sizeof isomp->root); 521 isomp->root_extent = isonum_733 (rootp->extent); 522 isomp->root_size = isonum_733 (rootp->size); 523 isomp->joliet_level = joliet_level; 524 supbp->b_flags |= B_AGE; 525 } 526 527 if (supbp) { 528 brelse(supbp); 529 supbp = NULL; 530 } 531 532 vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops); 533 vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops); 534 vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops); 535 536 return 0; 537 out: 538 dev->si_mountpoint = NULL; 539 if (bp) 540 brelse(bp); 541 if (pribp) 542 brelse(pribp); 543 if (supbp) 544 brelse(supbp); 545 if (needclose) { 546 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 547 VOP_CLOSE(devvp, FREAD, NULL); 548 vn_unlock(devvp); 549 } 550 if (isomp) { 551 kfree((caddr_t)isomp, M_ISOFSMNT); 552 mp->mnt_data = (qaddr_t)0; 553 } 554 return error; 555 } 556 557 /* 558 * unmount system call 559 */ 560 static int 561 cd9660_unmount(struct mount *mp, int mntflags) 562 { 563 struct iso_mnt *isomp; 564 int error, flags = 0; 565 566 if (mntflags & MNT_FORCE) 567 flags |= FORCECLOSE; 568 #if 0 569 mntflushbuf(mp, 0); 570 if (mntinvalbuf(mp)) 571 return EBUSY; 572 #endif 573 if ((error = vflush(mp, 0, flags))) 574 return (error); 575 576 isomp = VFSTOISOFS(mp); 577 578 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 579 if (isomp->im_d2l) 580 cd9660_iconv->close(isomp->im_d2l); 581 if (isomp->im_l2d) 582 cd9660_iconv->close(isomp->im_l2d); 583 } 584 585 isomp->im_devvp->v_rdev->si_mountpoint = NULL; 586 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 587 error = VOP_CLOSE(isomp->im_devvp, FREAD, NULL); 588 vn_unlock(isomp->im_devvp); 589 vrele(isomp->im_devvp); 590 kfree((caddr_t)isomp, M_ISOFSMNT); 591 mp->mnt_data = (qaddr_t)0; 592 mp->mnt_flag &= ~MNT_LOCAL; 593 return (error); 594 } 595 596 /* 597 * Return root of a filesystem 598 */ 599 static int 600 cd9660_root(struct mount *mp, struct vnode **vpp) 601 { 602 struct iso_mnt *imp = VFSTOISOFS(mp); 603 struct iso_directory_record *dp = 604 (struct iso_directory_record *)imp->root; 605 ino_t ino = isodirino(dp, imp); 606 607 /* 608 * With RRIP we must use the `.' entry of the root directory. 609 * Simply tell vget, that it's a relocated directory. 610 */ 611 return (cd9660_vget_internal(mp, ino, vpp, 612 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 613 } 614 615 /* 616 * Get filesystem statistics. 617 */ 618 int 619 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 620 { 621 struct iso_mnt *isomp; 622 623 isomp = VFSTOISOFS(mp); 624 625 sbp->f_bsize = isomp->logical_block_size; 626 sbp->f_iosize = sbp->f_bsize; /* XXX */ 627 sbp->f_blocks = isomp->volume_space_size; 628 sbp->f_bfree = 0; /* total free blocks */ 629 sbp->f_bavail = 0; /* blocks free for non superuser */ 630 sbp->f_files = 0; /* total files */ 631 sbp->f_ffree = 0; /* free file nodes */ 632 if (sbp != &mp->mnt_stat) { 633 sbp->f_type = mp->mnt_vfc->vfc_typenum; 634 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 635 } 636 return 0; 637 } 638 639 /* 640 * File handle to vnode 641 * 642 * Have to be really careful about stale file handles: 643 * - check that the inode number is in range 644 * - call iget() to get the locked inode 645 * - check for an unallocated inode (i_mode == 0) 646 * - check that the generation number matches 647 */ 648 649 struct ifid { 650 ushort ifid_len; 651 ushort ifid_pad; 652 int ifid_ino; 653 long ifid_start; 654 }; 655 656 /* ARGSUSED */ 657 int 658 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp, 659 struct fid *fhp, struct vnode **vpp) 660 { 661 struct ifid *ifhp = (struct ifid *)fhp; 662 struct iso_node *ip; 663 struct vnode *nvp; 664 int error; 665 666 #ifdef ISOFS_DBG 667 kprintf("fhtovp: ino %d, start %ld\n", 668 ifhp->ifid_ino, ifhp->ifid_start); 669 #endif 670 671 if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) { 672 *vpp = NULLVP; 673 return (error); 674 } 675 ip = VTOI(nvp); 676 if (ip->inode.iso_mode == 0) { 677 vput(nvp); 678 *vpp = NULLVP; 679 return (ESTALE); 680 } 681 *vpp = nvp; 682 return (0); 683 } 684 685 int 686 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 687 struct ucred **credanonp) 688 { 689 struct netcred *np; 690 struct iso_mnt *imp; 691 692 imp = VFSTOISOFS(mp); 693 694 /* 695 * Get the export permission structure for this <mp, client> tuple. 696 */ 697 np = vfs_export_lookup(mp, &imp->im_export, nam); 698 if (np == NULL) 699 return (EACCES); 700 701 *exflagsp = np->netc_exflags; 702 *credanonp = &np->netc_anon; 703 return (0); 704 } 705 706 int 707 cd9660_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 708 { 709 710 /* 711 * XXXX 712 * It would be nice if we didn't always set the `relocated' flag 713 * and force the extra read, but I don't want to think about fixing 714 * that right now. 715 */ 716 return (cd9660_vget_internal(mp, ino, vpp, 717 #if 0 718 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 719 #else 720 0, 721 #endif 722 NULL)); 723 } 724 725 int 726 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp, 727 int relocated, struct iso_directory_record *isodir) 728 { 729 struct iso_mnt *imp; 730 struct iso_node *ip; 731 struct buf *bp; 732 struct vnode *vp; 733 cdev_t dev; 734 int error; 735 736 imp = VFSTOISOFS(mp); 737 dev = imp->im_dev; 738 again: 739 if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP) 740 return (0); 741 742 /* Allocate a new vnode/iso_node. */ 743 error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0); 744 if (error) { 745 *vpp = NULLVP; 746 return (error); 747 } 748 ip = kmalloc(sizeof(struct iso_node), M_ISOFSNODE, M_WAITOK | M_ZERO); 749 ip->i_vnode = vp; 750 ip->i_dev = dev; 751 ip->i_number = ino; 752 753 /* 754 * Insert it into the inode hash table and check for a collision. 755 * If a collision occurs, throw away the vnode and try again. 756 */ 757 if (cd9660_ihashins(ip) != 0) { 758 kprintf("debug: cd9660 ihashins collision, retrying\n"); 759 vx_put(vp); 760 kfree(ip, M_ISOFSNODE); 761 goto again; 762 } 763 vp->v_data = ip; 764 765 if (isodir == NULL) { 766 int lbn, off; 767 768 lbn = lblkno(imp, ino); 769 if (lbn >= imp->volume_space_size) { 770 vx_put(vp); 771 kprintf("fhtovp: lbn exceed volume space %d\n", lbn); 772 return (ESTALE); 773 } 774 775 off = blkoff(imp, ino); 776 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 777 vx_put(vp); 778 kprintf("fhtovp: crosses block boundary %d\n", 779 off + ISO_DIRECTORY_RECORD_SIZE); 780 return (ESTALE); 781 } 782 783 error = bread(imp->im_devvp, 784 lblktooff(imp, lbn), 785 imp->logical_block_size, &bp); 786 if (error) { 787 vx_put(vp); 788 brelse(bp); 789 kprintf("fhtovp: bread error %d\n",error); 790 return (error); 791 } 792 isodir = (struct iso_directory_record *)(bp->b_data + off); 793 794 if (off + isonum_711(isodir->length) > 795 imp->logical_block_size) { 796 vx_put(vp); 797 if (bp != NULL) 798 brelse(bp); 799 kprintf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 800 off +isonum_711(isodir->length), off, 801 isonum_711(isodir->length)); 802 return (ESTALE); 803 } 804 805 #if 0 806 if (isonum_733(isodir->extent) + 807 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 808 if (bp != NULL) 809 brelse(bp); 810 kprintf("fhtovp: file start miss %d vs %d\n", 811 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 812 ifhp->ifid_start); 813 return (ESTALE); 814 } 815 #endif 816 } else 817 bp = NULL; 818 819 ip->i_mnt = imp; 820 ip->i_devvp = imp->im_devvp; 821 vref(ip->i_devvp); 822 823 if (relocated) { 824 /* 825 * On relocated directories we must 826 * read the `.' entry out of a dir. 827 */ 828 ip->iso_start = ino >> imp->im_bshift; 829 if (bp != NULL) 830 brelse(bp); 831 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 832 vx_put(vp); 833 return (error); 834 } 835 isodir = (struct iso_directory_record *)bp->b_data; 836 } 837 838 ip->iso_extent = isonum_733(isodir->extent); 839 ip->i_size = isonum_733(isodir->size); 840 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 841 842 /* 843 * Setup time stamp, attribute 844 */ 845 vp->v_type = VNON; 846 switch (imp->iso_ftype) { 847 default: /* ISO_FTYPE_9660 */ 848 { 849 struct buf *bp2; 850 int off; 851 if ((imp->im_flags & ISOFSMNT_EXTATT) 852 && (off = isonum_711(isodir->ext_attr_length))) 853 cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 854 &bp2); 855 else 856 bp2 = NULL; 857 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 858 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 859 if (bp2) 860 brelse(bp2); 861 break; 862 } 863 case ISO_FTYPE_RRIP: 864 cd9660_rrip_analyze(isodir, ip, imp); 865 break; 866 } 867 868 if (bp != NULL) 869 brelse(bp); 870 871 /* 872 * Initialize the associated vnode 873 */ 874 vp->v_type = IFTOVT(ip->inode.iso_mode); 875 876 switch (vp->v_type) { 877 case VFIFO: 878 vp->v_ops = &mp->mnt_vn_fifo_ops; 879 break; 880 case VCHR: 881 case VBLK: 882 vp->v_ops = &mp->mnt_vn_spec_ops; 883 addaliasu(vp, umajor(ip->inode.iso_rdev), 884 uminor(ip->inode.iso_rdev)); 885 break; 886 case VREG: 887 case VDIR: 888 vinitvmio(vp, ip->i_size, PAGE_SIZE, -1); 889 break; 890 default: 891 break; 892 } 893 894 if (ip->iso_extent == imp->root_extent) 895 vsetflags(vp, VROOT); 896 897 /* 898 * Return the locked and refd vp 899 */ 900 vx_downgrade(vp); 901 *vpp = vp; 902 return (0); 903 } 904 905 /* 906 * Vnode pointer to File handle 907 */ 908 /* ARGSUSED */ 909 int 910 cd9660_vptofh(struct vnode *vp, struct fid *fhp) 911 { 912 struct iso_node *ip = VTOI(vp); 913 struct ifid *ifhp; 914 915 ifhp = (struct ifid *)fhp; 916 ifhp->ifid_len = sizeof(struct ifid); 917 918 ifhp->ifid_ino = ip->i_number; 919 ifhp->ifid_start = ip->iso_start; 920 921 #ifdef ISOFS_DBG 922 kprintf("vptofh: ino %d, start %ld\n", 923 ifhp->ifid_ino,ifhp->ifid_start); 924 #endif 925 return 0; 926 } 927