cd9660_vfsops.c revision 1.52
1 /* $NetBSD: cd9660_vfsops.c,v 1.52 2007/12/08 19:29:42 pooka Exp $ */ 2 3 /*- 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley 8 * by Pace Willisson (pace (at) blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai (at) spec.co.jp). 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 * 3. 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 REGENTS 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 REGENTS 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 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: cd9660_vfsops.c,v 1.52 2007/12/08 19:29:42 pooka Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_compat_netbsd.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/sysctl.h> 48 #include <sys/systm.h> 49 #include <sys/namei.h> 50 #include <sys/proc.h> 51 #include <sys/kernel.h> 52 #include <sys/vnode.h> 53 #include <miscfs/specfs/specdev.h> 54 #include <sys/mount.h> 55 #include <sys/buf.h> 56 #include <sys/file.h> 57 #include <sys/disklabel.h> 58 #include <sys/device.h> 59 #include <sys/ioctl.h> 60 #include <sys/cdio.h> 61 #include <sys/errno.h> 62 #include <sys/malloc.h> 63 #include <sys/pool.h> 64 #include <sys/stat.h> 65 #include <sys/conf.h> 66 #include <sys/dirent.h> 67 #include <sys/kauth.h> 68 69 #include <fs/cd9660/iso.h> 70 #include <fs/cd9660/cd9660_extern.h> 71 #include <fs/cd9660/iso_rrip.h> 72 #include <fs/cd9660/cd9660_node.h> 73 #include <fs/cd9660/cd9660_mount.h> 74 75 MALLOC_JUSTDEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure"); 76 77 extern const struct vnodeopv_desc cd9660_vnodeop_opv_desc; 78 extern const struct vnodeopv_desc cd9660_specop_opv_desc; 79 extern const struct vnodeopv_desc cd9660_fifoop_opv_desc; 80 81 const struct vnodeopv_desc * const cd9660_vnodeopv_descs[] = { 82 &cd9660_vnodeop_opv_desc, 83 &cd9660_specop_opv_desc, 84 &cd9660_fifoop_opv_desc, 85 NULL, 86 }; 87 88 struct vfsops cd9660_vfsops = { 89 MOUNT_CD9660, 90 sizeof (struct iso_args), 91 cd9660_mount, 92 cd9660_start, 93 cd9660_unmount, 94 cd9660_root, 95 (void *)eopnotsupp, 96 cd9660_statvfs, 97 cd9660_sync, 98 cd9660_vget, 99 cd9660_fhtovp, 100 cd9660_vptofh, 101 cd9660_init, 102 cd9660_reinit, 103 cd9660_done, 104 cd9660_mountroot, 105 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 106 vfs_stdextattrctl, 107 (void *)eopnotsupp, /* vfs_suspendctl */ 108 cd9660_vnodeopv_descs, 109 0, /* refcount */ 110 { NULL, NULL } /* list */ 111 }; 112 VFS_ATTACH(cd9660_vfsops); 113 114 static const struct genfs_ops cd9660_genfsops = { 115 .gop_size = genfs_size, 116 }; 117 118 /* 119 * Called by vfs_mountroot when iso is going to be mounted as root. 120 * 121 * Name is updated by mount(8) after booting. 122 */ 123 #define ROOTNAME "root_device" 124 125 static int iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len); 126 static int iso_mountfs(struct vnode *devvp, struct mount *mp, 127 struct lwp *l, struct iso_args *argp); 128 129 int 130 cd9660_mountroot() 131 { 132 struct mount *mp; 133 struct lwp *l = curlwp; 134 int error; 135 struct iso_args args; 136 137 if (device_class(root_device) != DV_DISK) 138 return (ENODEV); 139 140 if ((error = vfs_rootmountalloc(MOUNT_CD9660, "root_device", &mp)) 141 != 0) { 142 vrele(rootvp); 143 return (error); 144 } 145 146 args.flags = ISOFSMNT_ROOT; 147 if ((error = iso_mountfs(rootvp, mp, l, &args)) != 0) { 148 mp->mnt_op->vfs_refcount--; 149 vfs_unbusy(mp); 150 vfs_destroy(mp); 151 return (error); 152 } 153 mutex_enter(&mountlist_lock); 154 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 155 mutex_exit(&mountlist_lock); 156 (void)cd9660_statvfs(mp, &mp->mnt_stat); 157 vfs_unbusy(mp); 158 return (0); 159 } 160 161 /* 162 * VFS Operations. 163 * 164 * mount system call 165 */ 166 int 167 cd9660_mount(mp, path, data, data_len) 168 struct mount *mp; 169 const char *path; 170 void *data; 171 size_t *data_len; 172 { 173 struct lwp *l = curlwp; 174 struct nameidata nd; 175 struct vnode *devvp; 176 struct iso_args *args = data; 177 int error; 178 struct iso_mnt *imp = VFSTOISOFS(mp); 179 180 if (*data_len < sizeof *args) 181 return EINVAL; 182 183 if (mp->mnt_flag & MNT_GETARGS) { 184 if (imp == NULL) 185 return EIO; 186 args->fspec = NULL; 187 args->flags = imp->im_flags; 188 *data_len = sizeof (*args); 189 return 0; 190 } 191 192 if ((mp->mnt_flag & MNT_RDONLY) == 0) 193 return (EROFS); 194 195 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 196 return EINVAL; 197 198 /* 199 * Not an update, or updating the name: look up the name 200 * and verify that it refers to a sensible block device. 201 */ 202 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 203 if ((error = namei(&nd)) != 0) 204 return (error); 205 devvp = nd.ni_vp; 206 207 if (devvp->v_type != VBLK) { 208 vrele(devvp); 209 return ENOTBLK; 210 } 211 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 212 vrele(devvp); 213 return ENXIO; 214 } 215 /* 216 * If mount by non-root, then verify that user has necessary 217 * permissions on the device. 218 */ 219 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 220 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 221 error = VOP_ACCESS(devvp, VREAD, l->l_cred); 222 VOP_UNLOCK(devvp, 0); 223 if (error) { 224 vrele(devvp); 225 return (error); 226 } 227 } 228 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 229 /* 230 * Disallow multiple mounts of the same device. 231 * Disallow mounting of a device that is currently in use 232 * (except for root, which might share swap device for 233 * miniroot). 234 */ 235 error = vfs_mountedon(devvp); 236 if (error) 237 goto fail; 238 if (vcount(devvp) > 1 && devvp != rootvp) { 239 error = EBUSY; 240 goto fail; 241 } 242 error = VOP_OPEN(devvp, FREAD, FSCRED); 243 if (error) 244 goto fail; 245 error = iso_mountfs(devvp, mp, l, args); 246 if (error) { 247 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 248 (void)VOP_CLOSE(devvp, FREAD, NOCRED); 249 VOP_UNLOCK(devvp, 0); 250 goto fail; 251 } 252 } else { 253 vrele(devvp); 254 if (devvp != imp->im_devvp) 255 return (EINVAL); /* needs translation */ 256 } 257 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 258 mp->mnt_op->vfs_name, mp, l); 259 260 fail: 261 vrele(devvp); 262 return (error); 263 } 264 265 /* 266 * Make a mount point from a volume descriptor 267 */ 268 static int 269 iso_makemp(isomp, bp, ea_len) 270 struct iso_mnt *isomp; 271 struct buf *bp; 272 int *ea_len; 273 { 274 struct iso_primary_descriptor *pri; 275 int logical_block_size; 276 struct iso_directory_record *rootp; 277 278 pri = (struct iso_primary_descriptor *)bp->b_data; 279 280 logical_block_size = isonum_723 (pri->logical_block_size); 281 282 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 283 || (logical_block_size & (logical_block_size - 1)) != 0) 284 return -1; 285 286 rootp = (struct iso_directory_record *)pri->root_directory_record; 287 288 isomp->logical_block_size = logical_block_size; 289 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 290 memcpy(isomp->root, rootp, sizeof(isomp->root)); 291 isomp->root_extent = isonum_733 (rootp->extent); 292 isomp->root_size = isonum_733 (rootp->size); 293 isomp->im_joliet_level = 0; 294 295 isomp->im_bmask = logical_block_size - 1; 296 isomp->im_bshift = 0; 297 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 298 isomp->im_bshift++; 299 300 if (ea_len != NULL) 301 *ea_len = isonum_711(rootp->ext_attr_length); 302 303 return 0; 304 } 305 306 /* 307 * Common code for mount and mountroot 308 */ 309 static int 310 iso_mountfs(devvp, mp, l, argp) 311 struct vnode *devvp; 312 struct mount *mp; 313 struct lwp *l; 314 struct iso_args *argp; 315 { 316 struct iso_mnt *isomp = (struct iso_mnt *)0; 317 struct buf *bp = NULL, *pribp = NULL, *supbp = NULL; 318 dev_t dev = devvp->v_rdev; 319 int error = EINVAL; 320 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 321 int iso_bsize; 322 int iso_blknum; 323 int joliet_level; 324 struct iso_volume_descriptor *vdp; 325 struct iso_supplementary_descriptor *sup; 326 int sess = 0; 327 int ext_attr_length; 328 struct disklabel label; 329 330 if (!ronly) 331 return EROFS; 332 333 /* Flush out any old buffers remaining from a previous use. */ 334 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 335 return (error); 336 337 /* This is the "logical sector size". The standard says this 338 * should be 2048 or the physical sector size on the device, 339 * whichever is greater. For now, we'll just use a constant. 340 */ 341 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 342 343 error = VOP_IOCTL(devvp, DIOCGDINFO, &label, FREAD, FSCRED); 344 if (!error && 345 label.d_partitions[DISKPART(dev)].p_fstype == FS_ISO9660) { 346 /* XXX more sanity checks? */ 347 sess = label.d_partitions[DISKPART(dev)].p_cdsession; 348 } else { 349 /* fallback to old method */ 350 error = VOP_IOCTL(devvp, CDIOREADMSADDR, &sess, 0, FSCRED); 351 if (error) 352 sess = 0; /* never mind */ 353 } 354 #ifdef ISO_DEBUG 355 printf("isofs: session offset (part %d) %d\n", DISKPART(dev), sess); 356 #endif 357 358 for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { 359 if ((error = bread(devvp, (iso_blknum+sess) * btodb(iso_bsize), 360 iso_bsize, NOCRED, &bp)) != 0) 361 goto out; 362 363 vdp = (struct iso_volume_descriptor *)bp->b_data; 364 if (memcmp(vdp->id, ISO_STANDARD_ID, sizeof(vdp->id)) != 0) { 365 error = EINVAL; 366 goto out; 367 } 368 369 switch (isonum_711(vdp->type)) { 370 case ISO_VD_PRIMARY: 371 if (pribp == NULL) { 372 pribp = bp; 373 bp = NULL; 374 } 375 break; 376 377 case ISO_VD_SUPPLEMENTARY: 378 if (supbp == NULL) { 379 supbp = bp; 380 bp = NULL; 381 } 382 break; 383 384 default: 385 break; 386 } 387 388 if (isonum_711 (vdp->type) == ISO_VD_END) { 389 brelse(bp, 0); 390 bp = NULL; 391 break; 392 } 393 394 if (bp != NULL) { 395 brelse(bp, 0); 396 bp = NULL; 397 } 398 } 399 400 if (pribp == NULL) { 401 error = EINVAL; 402 goto out; 403 } 404 405 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); 406 memset(isomp, 0, sizeof *isomp); 407 if (iso_makemp(isomp, pribp, &ext_attr_length) == -1) { 408 error = EINVAL; 409 goto out; 410 } 411 412 isomp->volume_space_size += sess; 413 414 brelse(pribp, BC_AGE); 415 pribp = NULL; 416 417 mp->mnt_data = isomp; 418 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 419 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CD9660); 420 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 421 mp->mnt_stat.f_namemax = MAXNAMLEN; 422 mp->mnt_flag |= MNT_LOCAL; 423 mp->mnt_dev_bshift = iso_bsize; 424 mp->mnt_fs_bshift = isomp->im_bshift; 425 isomp->im_mountp = mp; 426 isomp->im_dev = dev; 427 isomp->im_devvp = devvp; 428 429 /* Check the Rock Ridge Extension support */ 430 if (!(argp->flags & ISOFSMNT_NORRIP)) { 431 struct iso_directory_record *rootp; 432 433 if ((error = bread(isomp->im_devvp, 434 (isomp->root_extent + ext_attr_length) << 435 (isomp->im_bshift - DEV_BSHIFT), 436 isomp->logical_block_size, NOCRED, 437 &bp)) != 0) 438 goto out; 439 440 rootp = (struct iso_directory_record *)bp->b_data; 441 442 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 443 argp->flags |= ISOFSMNT_NORRIP; 444 } else { 445 argp->flags &= ~ISOFSMNT_GENS; 446 } 447 448 /* 449 * The contents are valid, 450 * but they will get reread as part of another vnode, so... 451 */ 452 brelse(bp, BC_AGE); 453 bp = NULL; 454 } 455 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 456 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | ISOFSMNT_RRCASEINS); 457 458 if (isomp->im_flags & ISOFSMNT_GENS) 459 isomp->iso_ftype = ISO_FTYPE_9660; 460 else if (isomp->im_flags & ISOFSMNT_NORRIP) { 461 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 462 if (argp->flags & ISOFSMNT_NOCASETRANS) 463 isomp->im_flags |= ISOFSMNT_NOCASETRANS; 464 } else 465 isomp->iso_ftype = ISO_FTYPE_RRIP; 466 467 /* Check the Joliet Extension support */ 468 if ((argp->flags & ISOFSMNT_NORRIP) != 0 && 469 (argp->flags & ISOFSMNT_NOJOLIET) == 0 && 470 supbp != NULL) { 471 joliet_level = 0; 472 sup = (struct iso_supplementary_descriptor *)supbp->b_data; 473 474 if ((isonum_711(sup->flags) & 1) == 0) { 475 if (memcmp(sup->escape, "%/@", 3) == 0) 476 joliet_level = 1; 477 if (memcmp(sup->escape, "%/C", 3) == 0) 478 joliet_level = 2; 479 if (memcmp(sup->escape, "%/E", 3) == 0) 480 joliet_level = 3; 481 } 482 if (joliet_level != 0) { 483 if (iso_makemp(isomp, supbp, NULL) == -1) { 484 error = EINVAL; 485 goto out; 486 } 487 isomp->im_joliet_level = joliet_level; 488 } 489 } 490 491 if (supbp != NULL) { 492 brelse(supbp, 0); 493 supbp = NULL; 494 } 495 496 devvp->v_specmountpoint = mp; 497 498 return 0; 499 out: 500 if (bp) 501 brelse(bp, 0); 502 if (pribp) 503 brelse(pribp, 0); 504 if (supbp) 505 brelse(supbp, 0); 506 if (isomp) { 507 free(isomp, M_ISOFSMNT); 508 mp->mnt_data = NULL; 509 } 510 return error; 511 } 512 513 /* 514 * Make a filesystem operational. 515 * Nothing to do at the moment. 516 */ 517 /* ARGSUSED */ 518 int 519 cd9660_start(struct mount *mp, int flags) 520 { 521 return 0; 522 } 523 524 /* 525 * unmount system call 526 */ 527 int 528 cd9660_unmount(mp, mntflags) 529 struct mount *mp; 530 int mntflags; 531 { 532 struct iso_mnt *isomp; 533 int error, flags = 0; 534 535 if (mntflags & MNT_FORCE) 536 flags |= FORCECLOSE; 537 if ((error = vflush(mp, NULLVP, flags)) != 0) 538 return (error); 539 540 isomp = VFSTOISOFS(mp); 541 542 if (isomp->im_devvp->v_type != VBAD) 543 isomp->im_devvp->v_specmountpoint = NULL; 544 545 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 546 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED); 547 vput(isomp->im_devvp); 548 free(isomp, M_ISOFSMNT); 549 mp->mnt_data = NULL; 550 mp->mnt_flag &= ~MNT_LOCAL; 551 return (error); 552 } 553 554 /* 555 * Return root of a filesystem 556 */ 557 int 558 cd9660_root(mp, vpp) 559 struct mount *mp; 560 struct vnode **vpp; 561 { 562 struct iso_mnt *imp = VFSTOISOFS(mp); 563 struct iso_directory_record *dp = 564 (struct iso_directory_record *)imp->root; 565 ino_t ino = isodirino(dp, imp); 566 567 /* 568 * With RRIP we must use the `.' entry of the root directory. 569 * Simply tell vget, that it's a relocated directory. 570 */ 571 return (cd9660_vget_internal(mp, ino, vpp, 572 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 573 } 574 575 /* 576 * Get file system statistics. 577 */ 578 int 579 cd9660_statvfs( 580 struct mount *mp, 581 struct statvfs *sbp) 582 { 583 struct iso_mnt *isomp; 584 585 isomp = VFSTOISOFS(mp); 586 587 sbp->f_bsize = isomp->logical_block_size; 588 sbp->f_frsize = sbp->f_bsize; 589 sbp->f_iosize = sbp->f_bsize; /* XXX */ 590 sbp->f_blocks = isomp->volume_space_size; 591 sbp->f_bfree = 0; /* total free blocks */ 592 sbp->f_bavail = 0; /* blocks free for non superuser */ 593 sbp->f_bresvd = 0; /* total reserved blocks */ 594 sbp->f_files = 0; /* total files */ 595 sbp->f_ffree = 0; /* free file nodes */ 596 sbp->f_favail = 0; /* free file nodes for non superuser */ 597 sbp->f_fresvd = 0; /* reserved file nodes */ 598 copy_statvfs_info(sbp, mp); 599 /* Use the first spare for flags: */ 600 sbp->f_spare[0] = isomp->im_flags; 601 return 0; 602 } 603 604 /* ARGSUSED */ 605 int 606 cd9660_sync( 607 struct mount *mp, 608 int waitfor, 609 kauth_cred_t cred) 610 { 611 return (0); 612 } 613 614 /* 615 * File handle to vnode 616 * 617 * Have to be really careful about stale file handles: 618 * - check that the inode number is in range 619 * - call iget() to get the locked inode 620 * - check for an unallocated inode (i_mode == 0) 621 * - check that the generation number matches 622 */ 623 624 struct ifid { 625 ushort ifid_len; 626 ushort ifid_pad; 627 int ifid_ino; 628 long ifid_start; 629 }; 630 631 /* ARGSUSED */ 632 int 633 cd9660_fhtovp(mp, fhp, vpp) 634 struct mount *mp; 635 struct fid *fhp; 636 struct vnode **vpp; 637 { 638 struct ifid ifh; 639 struct iso_node *ip; 640 struct vnode *nvp; 641 int error; 642 643 if (fhp->fid_len != sizeof(ifh)) 644 return EINVAL; 645 646 memcpy(&ifh, fhp, sizeof(ifh)); 647 #ifdef ISOFS_DBG 648 printf("fhtovp: ino %d, start %ld\n", 649 ifh.ifid_ino, ifh.ifid_start); 650 #endif 651 652 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 653 *vpp = NULLVP; 654 return (error); 655 } 656 ip = VTOI(nvp); 657 if (ip->inode.iso_mode == 0) { 658 vput(nvp); 659 *vpp = NULLVP; 660 return (ESTALE); 661 } 662 *vpp = nvp; 663 return (0); 664 } 665 666 int 667 cd9660_vget(mp, ino, vpp) 668 struct mount *mp; 669 ino_t ino; 670 struct vnode **vpp; 671 { 672 673 /* 674 * XXXX 675 * It would be nice if we didn't always set the `relocated' flag 676 * and force the extra read, but I don't want to think about fixing 677 * that right now. 678 */ 679 return (cd9660_vget_internal(mp, ino, vpp, 680 #if 0 681 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 682 #else 683 0, 684 #endif 685 NULL)); 686 } 687 688 int 689 cd9660_vget_internal(mp, ino, vpp, relocated, isodir) 690 struct mount *mp; 691 ino_t ino; 692 struct vnode **vpp; 693 int relocated; 694 struct iso_directory_record *isodir; 695 { 696 struct iso_mnt *imp; 697 struct iso_node *ip; 698 struct buf *bp; 699 struct vnode *vp, *nvp; 700 dev_t dev; 701 int error; 702 703 imp = VFSTOISOFS(mp); 704 dev = imp->im_dev; 705 706 retry: 707 if ((*vpp = cd9660_ihashget(dev, ino, LK_EXCLUSIVE)) != NULLVP) 708 return (0); 709 710 /* Allocate a new vnode/iso_node. */ 711 if ((error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, &vp)) != 0) { 712 *vpp = NULLVP; 713 return (error); 714 } 715 ip = pool_get(&cd9660_node_pool, PR_WAITOK); 716 717 /* 718 * If someone beat us to it, put back the freshly allocated 719 * vnode/inode pair and retry. 720 */ 721 mutex_enter(&cd9660_hashlock); 722 if (cd9660_ihashget(dev, ino, 0) != NULL) { 723 mutex_exit(&cd9660_hashlock); 724 ungetnewvnode(vp); 725 pool_put(&cd9660_node_pool, ip); 726 goto retry; 727 } 728 729 memset(ip, 0, sizeof(struct iso_node)); 730 vp->v_data = ip; 731 ip->i_vnode = vp; 732 ip->i_dev = dev; 733 ip->i_number = ino; 734 ip->i_mnt = imp; 735 ip->i_devvp = imp->im_devvp; 736 genfs_node_init(vp, &cd9660_genfsops); 737 738 /* 739 * Put it onto its hash chain and lock it so that other requests for 740 * this inode will block if they arrive while we are sleeping waiting 741 * for old data structures to be purged or for the contents of the 742 * disk portion of this inode to be read. 743 */ 744 cd9660_ihashins(ip); 745 mutex_exit(&cd9660_hashlock); 746 747 if (isodir == 0) { 748 int lbn, off; 749 750 lbn = lblkno(imp, ino); 751 if (lbn >= imp->volume_space_size) { 752 vput(vp); 753 printf("fhtovp: lbn exceed volume space %d\n", lbn); 754 return (ESTALE); 755 } 756 757 off = blkoff(imp, ino); 758 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 759 vput(vp); 760 printf("fhtovp: crosses block boundary %d\n", 761 off + ISO_DIRECTORY_RECORD_SIZE); 762 return (ESTALE); 763 } 764 765 error = bread(imp->im_devvp, 766 lbn << (imp->im_bshift - DEV_BSHIFT), 767 imp->logical_block_size, NOCRED, &bp); 768 if (error) { 769 vput(vp); 770 brelse(bp, 0); 771 printf("fhtovp: bread error %d\n",error); 772 return (error); 773 } 774 isodir = (struct iso_directory_record *)((char *)bp->b_data + off); 775 776 if (off + isonum_711(isodir->length) > 777 imp->logical_block_size) { 778 vput(vp); 779 if (bp != 0) 780 brelse(bp, 0); 781 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 782 off +isonum_711(isodir->length), off, 783 isonum_711(isodir->length)); 784 return (ESTALE); 785 } 786 787 #if 0 788 if (isonum_733(isodir->extent) + 789 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 790 if (bp != 0) 791 brelse(bp, 0); 792 printf("fhtovp: file start miss %d vs %d\n", 793 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 794 ifhp->ifid_start); 795 return (ESTALE); 796 } 797 #endif 798 } else 799 bp = 0; 800 801 VREF(ip->i_devvp); 802 803 if (relocated) { 804 /* 805 * On relocated directories we must 806 * read the `.' entry out of a dir. 807 */ 808 ip->iso_start = ino >> imp->im_bshift; 809 if (bp != 0) 810 brelse(bp, 0); 811 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 812 vput(vp); 813 return (error); 814 } 815 isodir = (struct iso_directory_record *)bp->b_data; 816 } 817 818 ip->iso_extent = isonum_733(isodir->extent); 819 ip->i_size = isonum_733(isodir->size); 820 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 821 822 /* 823 * Setup time stamp, attribute 824 */ 825 vp->v_type = VNON; 826 switch (imp->iso_ftype) { 827 default: /* ISO_FTYPE_9660 */ 828 { 829 struct buf *bp2; 830 int off; 831 if ((imp->im_flags & ISOFSMNT_EXTATT) 832 && (off = isonum_711(isodir->ext_attr_length))) 833 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), 834 NULL, &bp2); 835 else 836 bp2 = NULL; 837 cd9660_defattr(isodir, ip, bp2); 838 cd9660_deftstamp(isodir, ip, bp2); 839 if (bp2) 840 brelse(bp2, 0); 841 break; 842 } 843 case ISO_FTYPE_RRIP: 844 cd9660_rrip_analyze(isodir, ip, imp); 845 break; 846 } 847 848 if (bp != 0) 849 brelse(bp, 0); 850 851 /* 852 * Initialize the associated vnode 853 */ 854 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 855 case VFIFO: 856 vp->v_op = cd9660_fifoop_p; 857 break; 858 case VCHR: 859 case VBLK: 860 /* 861 * if device, look at device number table for translation 862 */ 863 vp->v_op = cd9660_specop_p; 864 if ((nvp = checkalias(vp, ip->inode.iso_rdev, mp)) != NULL) { 865 /* 866 * Discard unneeded vnode, but save its iso_node. 867 * Note that the lock is carried over in the iso_node 868 * to the replacement vnode. 869 */ 870 nvp->v_data = vp->v_data; 871 vp->v_data = NULL; 872 VOP_UNLOCK(vp, 0); 873 vp->v_op = spec_vnodeop_p; 874 vrele(vp); 875 vgone(vp); 876 lockmgr(&nvp->v_lock, LK_EXCLUSIVE, &nvp->v_interlock); 877 /* 878 * Reinitialize aliased inode. 879 */ 880 vp = nvp; 881 ip->i_vnode = vp; 882 } 883 break; 884 case VLNK: 885 case VNON: 886 case VSOCK: 887 case VDIR: 888 case VBAD: 889 break; 890 case VREG: 891 uvm_vnp_setsize(vp, ip->i_size); 892 break; 893 } 894 895 if (vp->v_type != VREG) 896 uvm_vnp_setsize(vp, 0); 897 898 if (ip->iso_extent == imp->root_extent) 899 vp->v_vflag |= VV_ROOT; 900 901 /* 902 * XXX need generation number? 903 */ 904 905 *vpp = vp; 906 return (0); 907 } 908 909 /* 910 * Vnode pointer to File handle 911 */ 912 /* ARGSUSED */ 913 int 914 cd9660_vptofh(vp, fhp, fh_size) 915 struct vnode *vp; 916 struct fid *fhp; 917 size_t *fh_size; 918 { 919 struct iso_node *ip = VTOI(vp); 920 struct ifid ifh; 921 922 if (*fh_size < sizeof(struct ifid)) { 923 *fh_size = sizeof(struct ifid); 924 return E2BIG; 925 } 926 *fh_size = sizeof(struct ifid); 927 928 memset(&ifh, 0, sizeof(ifh)); 929 ifh.ifid_len = sizeof(struct ifid); 930 ifh.ifid_ino = ip->i_number; 931 ifh.ifid_start = ip->iso_start; 932 memcpy(fhp, &ifh, sizeof(ifh)); 933 934 #ifdef ISOFS_DBG 935 printf("vptofh: ino %d, start %ld\n", 936 ifh.ifid_ino,ifh.ifid_start); 937 #endif 938 return 0; 939 } 940 941 SYSCTL_SETUP(sysctl_vfs_cd9660_setup, "sysctl vfs.cd9660 subtree setup") 942 { 943 944 sysctl_createv(clog, 0, NULL, NULL, 945 CTLFLAG_PERMANENT, CTLTYPE_NODE, "vfs", NULL, 946 NULL, 0, NULL, 0, 947 CTL_VFS, CTL_EOL); 948 sysctl_createv(clog, 0, NULL, NULL, 949 CTLFLAG_PERMANENT, CTLTYPE_NODE, "cd9660", 950 SYSCTL_DESCR("ISO-9660 file system"), 951 NULL, 0, NULL, 0, 952 CTL_VFS, 14, CTL_EOL); 953 954 sysctl_createv(clog, 0, NULL, NULL, 955 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 956 CTLTYPE_INT, "utf8_joliet", 957 SYSCTL_DESCR("Encode Joliet file names to UTF-8"), 958 NULL, 0, &cd9660_utf8_joliet, 0, 959 CTL_VFS, 14, CD9660_UTF8_JOLIET, CTL_EOL); 960 961 } 962
Indexes created Thu Sep 25 08:09:54 GMT 2025