cd9660_vfsops.c revision 1.55
1 /* $NetBSD: cd9660_vfsops.c,v 1.55 2008/01/28 14:31:16 dholland 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 1.55 2008/01/28 14:31:16 dholland 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/genfs/genfs.h> 54 #include <miscfs/specfs/specdev.h> 55 #include <sys/mount.h> 56 #include <sys/buf.h> 57 #include <sys/file.h> 58 #include <sys/disklabel.h> 59 #include <sys/device.h> 60 #include <sys/ioctl.h> 61 #include <sys/cdio.h> 62 #include <sys/errno.h> 63 #include <sys/malloc.h> 64 #include <sys/pool.h> 65 #include <sys/stat.h> 66 #include <sys/conf.h> 67 #include <sys/dirent.h> 68 #include <sys/kauth.h> 69 70 #include <fs/cd9660/iso.h> 71 #include <fs/cd9660/cd9660_extern.h> 72 #include <fs/cd9660/iso_rrip.h> 73 #include <fs/cd9660/cd9660_node.h> 74 #include <fs/cd9660/cd9660_mount.h> 75 76 MALLOC_JUSTDEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure"); 77 78 extern const struct vnodeopv_desc cd9660_vnodeop_opv_desc; 79 extern const struct vnodeopv_desc cd9660_specop_opv_desc; 80 extern const struct vnodeopv_desc cd9660_fifoop_opv_desc; 81 82 const struct vnodeopv_desc * const cd9660_vnodeopv_descs[] = { 83 &cd9660_vnodeop_opv_desc, 84 &cd9660_specop_opv_desc, 85 &cd9660_fifoop_opv_desc, 86 NULL, 87 }; 88 89 struct vfsops cd9660_vfsops = { 90 MOUNT_CD9660, 91 sizeof (struct iso_args), 92 cd9660_mount, 93 cd9660_start, 94 cd9660_unmount, 95 cd9660_root, 96 (void *)eopnotsupp, 97 cd9660_statvfs, 98 cd9660_sync, 99 cd9660_vget, 100 cd9660_fhtovp, 101 cd9660_vptofh, 102 cd9660_init, 103 cd9660_reinit, 104 cd9660_done, 105 cd9660_mountroot, 106 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 107 vfs_stdextattrctl, 108 (void *)eopnotsupp, /* vfs_suspendctl */ 109 genfs_renamelock_enter, 110 genfs_renamelock_exit, 111 cd9660_vnodeopv_descs, 112 0, /* refcount */ 113 { NULL, NULL } /* list */ 114 }; 115 VFS_ATTACH(cd9660_vfsops); 116 117 static const struct genfs_ops cd9660_genfsops = { 118 .gop_size = genfs_size, 119 }; 120 121 /* 122 * Called by vfs_mountroot when iso is going to be mounted as root. 123 * 124 * Name is updated by mount(8) after booting. 125 */ 126 #define ROOTNAME "root_device" 127 128 static int iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len); 129 static int iso_mountfs(struct vnode *devvp, struct mount *mp, 130 struct lwp *l, struct iso_args *argp); 131 132 int 133 cd9660_mountroot() 134 { 135 struct mount *mp; 136 struct lwp *l = curlwp; 137 int error; 138 struct iso_args args; 139 140 if (device_class(root_device) != DV_DISK) 141 return (ENODEV); 142 143 if ((error = vfs_rootmountalloc(MOUNT_CD9660, "root_device", &mp)) 144 != 0) { 145 vrele(rootvp); 146 return (error); 147 } 148 149 args.flags = ISOFSMNT_ROOT; 150 if ((error = iso_mountfs(rootvp, mp, l, &args)) != 0) { 151 mp->mnt_op->vfs_refcount--; 152 vfs_unbusy(mp); 153 vfs_destroy(mp); 154 return (error); 155 } 156 mutex_enter(&mountlist_lock); 157 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 158 mutex_exit(&mountlist_lock); 159 (void)cd9660_statvfs(mp, &mp->mnt_stat); 160 vfs_unbusy(mp); 161 return (0); 162 } 163 164 /* 165 * VFS Operations. 166 * 167 * mount system call 168 */ 169 int 170 cd9660_mount(mp, path, data, data_len) 171 struct mount *mp; 172 const char *path; 173 void *data; 174 size_t *data_len; 175 { 176 struct lwp *l = curlwp; 177 struct nameidata nd; 178 struct vnode *devvp; 179 struct iso_args *args = data; 180 int error; 181 struct iso_mnt *imp = VFSTOISOFS(mp); 182 183 if (*data_len < sizeof *args) 184 return EINVAL; 185 186 if (mp->mnt_flag & MNT_GETARGS) { 187 if (imp == NULL) 188 return EIO; 189 args->fspec = NULL; 190 args->flags = imp->im_flags; 191 *data_len = sizeof (*args); 192 return 0; 193 } 194 195 if ((mp->mnt_flag & MNT_RDONLY) == 0) 196 return (EROFS); 197 198 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 199 return EINVAL; 200 201 /* 202 * Not an update, or updating the name: look up the name 203 * and verify that it refers to a sensible block device. 204 */ 205 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 206 if ((error = namei(&nd)) != 0) 207 return (error); 208 devvp = nd.ni_vp; 209 210 if (devvp->v_type != VBLK) { 211 vrele(devvp); 212 return ENOTBLK; 213 } 214 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 215 vrele(devvp); 216 return ENXIO; 217 } 218 /* 219 * If mount by non-root, then verify that user has necessary 220 * permissions on the device. 221 */ 222 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 223 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 224 error = VOP_ACCESS(devvp, VREAD, l->l_cred); 225 VOP_UNLOCK(devvp, 0); 226 if (error) { 227 vrele(devvp); 228 return (error); 229 } 230 } 231 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 232 error = VOP_OPEN(devvp, FREAD, FSCRED); 233 if (error) 234 goto fail; 235 error = iso_mountfs(devvp, mp, l, args); 236 if (error) { 237 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 238 (void)VOP_CLOSE(devvp, FREAD, NOCRED); 239 VOP_UNLOCK(devvp, 0); 240 goto fail; 241 } 242 } else { 243 vrele(devvp); 244 if (devvp != imp->im_devvp) 245 return (EINVAL); /* needs translation */ 246 } 247 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 248 mp->mnt_op->vfs_name, mp, l); 249 250 fail: 251 vrele(devvp); 252 return (error); 253 } 254 255 /* 256 * Make a mount point from a volume descriptor 257 */ 258 static int 259 iso_makemp(isomp, bp, ea_len) 260 struct iso_mnt *isomp; 261 struct buf *bp; 262 int *ea_len; 263 { 264 struct iso_primary_descriptor *pri; 265 int logical_block_size; 266 struct iso_directory_record *rootp; 267 268 pri = (struct iso_primary_descriptor *)bp->b_data; 269 270 logical_block_size = isonum_723 (pri->logical_block_size); 271 272 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 273 || (logical_block_size & (logical_block_size - 1)) != 0) 274 return -1; 275 276 rootp = (struct iso_directory_record *)pri->root_directory_record; 277 278 isomp->logical_block_size = logical_block_size; 279 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 280 memcpy(isomp->root, rootp, sizeof(isomp->root)); 281 isomp->root_extent = isonum_733 (rootp->extent); 282 isomp->root_size = isonum_733 (rootp->size); 283 isomp->im_joliet_level = 0; 284 285 isomp->im_bmask = logical_block_size - 1; 286 isomp->im_bshift = 0; 287 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 288 isomp->im_bshift++; 289 290 if (ea_len != NULL) 291 *ea_len = isonum_711(rootp->ext_attr_length); 292 293 return 0; 294 } 295 296 /* 297 * Common code for mount and mountroot 298 */ 299 static int 300 iso_mountfs(devvp, mp, l, argp) 301 struct vnode *devvp; 302 struct mount *mp; 303 struct lwp *l; 304 struct iso_args *argp; 305 { 306 struct iso_mnt *isomp = (struct iso_mnt *)0; 307 struct buf *bp = NULL, *pribp = NULL, *supbp = NULL; 308 dev_t dev = devvp->v_rdev; 309 int error = EINVAL; 310 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 311 int iso_bsize; 312 int iso_blknum; 313 int joliet_level; 314 struct iso_volume_descriptor *vdp; 315 struct iso_supplementary_descriptor *sup; 316 int sess = 0; 317 int ext_attr_length; 318 struct disklabel label; 319 320 if (!ronly) 321 return EROFS; 322 323 /* Flush out any old buffers remaining from a previous use. */ 324 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 325 return (error); 326 327 /* This is the "logical sector size". The standard says this 328 * should be 2048 or the physical sector size on the device, 329 * whichever is greater. For now, we'll just use a constant. 330 */ 331 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 332 333 error = VOP_IOCTL(devvp, DIOCGDINFO, &label, FREAD, FSCRED); 334 if (!error && 335 label.d_partitions[DISKPART(dev)].p_fstype == FS_ISO9660) { 336 /* XXX more sanity checks? */ 337 sess = label.d_partitions[DISKPART(dev)].p_cdsession; 338 } else { 339 /* fallback to old method */ 340 error = VOP_IOCTL(devvp, CDIOREADMSADDR, &sess, 0, FSCRED); 341 if (error) 342 sess = 0; /* never mind */ 343 } 344 #ifdef ISO_DEBUG 345 printf("isofs: session offset (part %d) %d\n", DISKPART(dev), sess); 346 #endif 347 348 for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { 349 if ((error = bread(devvp, (iso_blknum+sess) * btodb(iso_bsize), 350 iso_bsize, NOCRED, &bp)) != 0) 351 goto out; 352 353 vdp = (struct iso_volume_descriptor *)bp->b_data; 354 if (memcmp(vdp->id, ISO_STANDARD_ID, sizeof(vdp->id)) != 0) { 355 error = EINVAL; 356 goto out; 357 } 358 359 switch (isonum_711(vdp->type)) { 360 case ISO_VD_PRIMARY: 361 if (pribp == NULL) { 362 pribp = bp; 363 bp = NULL; 364 } 365 break; 366 367 case ISO_VD_SUPPLEMENTARY: 368 if (supbp == NULL) { 369 supbp = bp; 370 bp = NULL; 371 } 372 break; 373 374 default: 375 break; 376 } 377 378 if (isonum_711 (vdp->type) == ISO_VD_END) { 379 brelse(bp, 0); 380 bp = NULL; 381 break; 382 } 383 384 if (bp != NULL) { 385 brelse(bp, 0); 386 bp = NULL; 387 } 388 } 389 390 if (pribp == NULL) { 391 error = EINVAL; 392 goto out; 393 } 394 395 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); 396 memset(isomp, 0, sizeof *isomp); 397 if (iso_makemp(isomp, pribp, &ext_attr_length) == -1) { 398 error = EINVAL; 399 goto out; 400 } 401 402 isomp->volume_space_size += sess; 403 404 brelse(pribp, BC_AGE); 405 pribp = NULL; 406 407 mp->mnt_data = isomp; 408 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 409 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CD9660); 410 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 411 mp->mnt_stat.f_namemax = MAXNAMLEN; 412 mp->mnt_flag |= MNT_LOCAL; 413 mp->mnt_iflag |= IMNT_MPSAFE; 414 mp->mnt_dev_bshift = iso_bsize; 415 mp->mnt_fs_bshift = isomp->im_bshift; 416 isomp->im_mountp = mp; 417 isomp->im_dev = dev; 418 isomp->im_devvp = devvp; 419 420 /* Check the Rock Ridge Extension support */ 421 if (!(argp->flags & ISOFSMNT_NORRIP)) { 422 struct iso_directory_record *rootp; 423 424 if ((error = bread(isomp->im_devvp, 425 (isomp->root_extent + ext_attr_length) << 426 (isomp->im_bshift - DEV_BSHIFT), 427 isomp->logical_block_size, NOCRED, 428 &bp)) != 0) 429 goto out; 430 431 rootp = (struct iso_directory_record *)bp->b_data; 432 433 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 434 argp->flags |= ISOFSMNT_NORRIP; 435 } else { 436 argp->flags &= ~ISOFSMNT_GENS; 437 } 438 439 /* 440 * The contents are valid, 441 * but they will get reread as part of another vnode, so... 442 */ 443 brelse(bp, BC_AGE); 444 bp = NULL; 445 } 446 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 447 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | ISOFSMNT_RRCASEINS); 448 449 if (isomp->im_flags & ISOFSMNT_GENS) 450 isomp->iso_ftype = ISO_FTYPE_9660; 451 else if (isomp->im_flags & ISOFSMNT_NORRIP) { 452 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 453 if (argp->flags & ISOFSMNT_NOCASETRANS) 454 isomp->im_flags |= ISOFSMNT_NOCASETRANS; 455 } else 456 isomp->iso_ftype = ISO_FTYPE_RRIP; 457 458 /* Check the Joliet Extension support */ 459 if ((argp->flags & ISOFSMNT_NORRIP) != 0 && 460 (argp->flags & ISOFSMNT_NOJOLIET) == 0 && 461 supbp != NULL) { 462 joliet_level = 0; 463 sup = (struct iso_supplementary_descriptor *)supbp->b_data; 464 465 if ((isonum_711(sup->flags) & 1) == 0) { 466 if (memcmp(sup->escape, "%/@", 3) == 0) 467 joliet_level = 1; 468 if (memcmp(sup->escape, "%/C", 3) == 0) 469 joliet_level = 2; 470 if (memcmp(sup->escape, "%/E", 3) == 0) 471 joliet_level = 3; 472 } 473 if (joliet_level != 0) { 474 if (iso_makemp(isomp, supbp, NULL) == -1) { 475 error = EINVAL; 476 goto out; 477 } 478 isomp->im_joliet_level = joliet_level; 479 } 480 } 481 482 if (supbp != NULL) { 483 brelse(supbp, 0); 484 supbp = NULL; 485 } 486 487 devvp->v_specmountpoint = mp; 488 489 return 0; 490 out: 491 if (bp) 492 brelse(bp, 0); 493 if (pribp) 494 brelse(pribp, 0); 495 if (supbp) 496 brelse(supbp, 0); 497 if (isomp) { 498 free(isomp, M_ISOFSMNT); 499 mp->mnt_data = NULL; 500 } 501 return error; 502 } 503 504 /* 505 * Make a filesystem operational. 506 * Nothing to do at the moment. 507 */ 508 /* ARGSUSED */ 509 int 510 cd9660_start(struct mount *mp, int flags) 511 { 512 return 0; 513 } 514 515 /* 516 * unmount system call 517 */ 518 int 519 cd9660_unmount(mp, mntflags) 520 struct mount *mp; 521 int mntflags; 522 { 523 struct iso_mnt *isomp; 524 int error, flags = 0; 525 526 if (mntflags & MNT_FORCE) 527 flags |= FORCECLOSE; 528 if ((error = vflush(mp, NULLVP, flags)) != 0) 529 return (error); 530 531 isomp = VFSTOISOFS(mp); 532 533 if (isomp->im_devvp->v_type != VBAD) 534 isomp->im_devvp->v_specmountpoint = NULL; 535 536 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 537 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED); 538 vput(isomp->im_devvp); 539 free(isomp, M_ISOFSMNT); 540 mp->mnt_data = NULL; 541 mp->mnt_flag &= ~MNT_LOCAL; 542 return (error); 543 } 544 545 /* 546 * Return root of a filesystem 547 */ 548 int 549 cd9660_root(mp, vpp) 550 struct mount *mp; 551 struct vnode **vpp; 552 { 553 struct iso_mnt *imp = VFSTOISOFS(mp); 554 struct iso_directory_record *dp = 555 (struct iso_directory_record *)imp->root; 556 ino_t ino = isodirino(dp, imp); 557 558 /* 559 * With RRIP we must use the `.' entry of the root directory. 560 * Simply tell vget, that it's a relocated directory. 561 */ 562 return (cd9660_vget_internal(mp, ino, vpp, 563 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 564 } 565 566 /* 567 * Get file system statistics. 568 */ 569 int 570 cd9660_statvfs( 571 struct mount *mp, 572 struct statvfs *sbp) 573 { 574 struct iso_mnt *isomp; 575 576 isomp = VFSTOISOFS(mp); 577 578 sbp->f_bsize = isomp->logical_block_size; 579 sbp->f_frsize = sbp->f_bsize; 580 sbp->f_iosize = sbp->f_bsize; /* XXX */ 581 sbp->f_blocks = isomp->volume_space_size; 582 sbp->f_bfree = 0; /* total free blocks */ 583 sbp->f_bavail = 0; /* blocks free for non superuser */ 584 sbp->f_bresvd = 0; /* total reserved blocks */ 585 sbp->f_files = 0; /* total files */ 586 sbp->f_ffree = 0; /* free file nodes */ 587 sbp->f_favail = 0; /* free file nodes for non superuser */ 588 sbp->f_fresvd = 0; /* reserved file nodes */ 589 copy_statvfs_info(sbp, mp); 590 /* Use the first spare for flags: */ 591 sbp->f_spare[0] = isomp->im_flags; 592 return 0; 593 } 594 595 /* ARGSUSED */ 596 int 597 cd9660_sync( 598 struct mount *mp, 599 int waitfor, 600 kauth_cred_t cred) 601 { 602 return (0); 603 } 604 605 /* 606 * File handle to vnode 607 * 608 * Have to be really careful about stale file handles: 609 * - check that the inode number is in range 610 * - call iget() to get the locked inode 611 * - check for an unallocated inode (i_mode == 0) 612 * - check that the generation number matches 613 */ 614 615 struct ifid { 616 ushort ifid_len; 617 ushort ifid_pad; 618 int ifid_ino; 619 long ifid_start; 620 }; 621 622 /* ARGSUSED */ 623 int 624 cd9660_fhtovp(mp, fhp, vpp) 625 struct mount *mp; 626 struct fid *fhp; 627 struct vnode **vpp; 628 { 629 struct ifid ifh; 630 struct iso_node *ip; 631 struct vnode *nvp; 632 int error; 633 634 if (fhp->fid_len != sizeof(ifh)) 635 return EINVAL; 636 637 memcpy(&ifh, fhp, sizeof(ifh)); 638 #ifdef ISOFS_DBG 639 printf("fhtovp: ino %d, start %ld\n", 640 ifh.ifid_ino, ifh.ifid_start); 641 #endif 642 643 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 644 *vpp = NULLVP; 645 return (error); 646 } 647 ip = VTOI(nvp); 648 if (ip->inode.iso_mode == 0) { 649 vput(nvp); 650 *vpp = NULLVP; 651 return (ESTALE); 652 } 653 *vpp = nvp; 654 return (0); 655 } 656 657 int 658 cd9660_vget(mp, ino, vpp) 659 struct mount *mp; 660 ino_t ino; 661 struct vnode **vpp; 662 { 663 664 /* 665 * XXXX 666 * It would be nice if we didn't always set the `relocated' flag 667 * and force the extra read, but I don't want to think about fixing 668 * that right now. 669 */ 670 return (cd9660_vget_internal(mp, ino, vpp, 671 #if 0 672 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 673 #else 674 0, 675 #endif 676 NULL)); 677 } 678 679 int 680 cd9660_vget_internal(mp, ino, vpp, relocated, isodir) 681 struct mount *mp; 682 ino_t ino; 683 struct vnode **vpp; 684 int relocated; 685 struct iso_directory_record *isodir; 686 { 687 struct iso_mnt *imp; 688 struct iso_node *ip; 689 struct buf *bp; 690 struct vnode *vp; 691 dev_t dev; 692 int error; 693 694 imp = VFSTOISOFS(mp); 695 dev = imp->im_dev; 696 697 retry: 698 if ((*vpp = cd9660_ihashget(dev, ino, LK_EXCLUSIVE)) != NULLVP) 699 return (0); 700 701 /* Allocate a new vnode/iso_node. */ 702 if ((error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, &vp)) != 0) { 703 *vpp = NULLVP; 704 return (error); 705 } 706 ip = pool_get(&cd9660_node_pool, PR_WAITOK); 707 708 /* 709 * If someone beat us to it, put back the freshly allocated 710 * vnode/inode pair and retry. 711 */ 712 mutex_enter(&cd9660_hashlock); 713 if (cd9660_ihashget(dev, ino, 0) != NULL) { 714 mutex_exit(&cd9660_hashlock); 715 ungetnewvnode(vp); 716 pool_put(&cd9660_node_pool, ip); 717 goto retry; 718 } 719 720 memset(ip, 0, sizeof(struct iso_node)); 721 vp->v_data = ip; 722 ip->i_vnode = vp; 723 ip->i_dev = dev; 724 ip->i_number = ino; 725 ip->i_mnt = imp; 726 ip->i_devvp = imp->im_devvp; 727 genfs_node_init(vp, &cd9660_genfsops); 728 729 /* 730 * Put it onto its hash chain and lock it so that other requests for 731 * this inode will block if they arrive while we are sleeping waiting 732 * for old data structures to be purged or for the contents of the 733 * disk portion of this inode to be read. 734 */ 735 cd9660_ihashins(ip); 736 mutex_exit(&cd9660_hashlock); 737 738 if (isodir == 0) { 739 int lbn, off; 740 741 lbn = lblkno(imp, ino); 742 if (lbn >= imp->volume_space_size) { 743 vput(vp); 744 printf("fhtovp: lbn exceed volume space %d\n", lbn); 745 return (ESTALE); 746 } 747 748 off = blkoff(imp, ino); 749 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 750 vput(vp); 751 printf("fhtovp: crosses block boundary %d\n", 752 off + ISO_DIRECTORY_RECORD_SIZE); 753 return (ESTALE); 754 } 755 756 error = bread(imp->im_devvp, 757 lbn << (imp->im_bshift - DEV_BSHIFT), 758 imp->logical_block_size, NOCRED, &bp); 759 if (error) { 760 vput(vp); 761 brelse(bp, 0); 762 printf("fhtovp: bread error %d\n",error); 763 return (error); 764 } 765 isodir = (struct iso_directory_record *)((char *)bp->b_data + off); 766 767 if (off + isonum_711(isodir->length) > 768 imp->logical_block_size) { 769 vput(vp); 770 if (bp != 0) 771 brelse(bp, 0); 772 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 773 off +isonum_711(isodir->length), off, 774 isonum_711(isodir->length)); 775 return (ESTALE); 776 } 777 778 #if 0 779 if (isonum_733(isodir->extent) + 780 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 781 if (bp != 0) 782 brelse(bp, 0); 783 printf("fhtovp: file start miss %d vs %d\n", 784 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 785 ifhp->ifid_start); 786 return (ESTALE); 787 } 788 #endif 789 } else 790 bp = 0; 791 792 VREF(ip->i_devvp); 793 794 if (relocated) { 795 /* 796 * On relocated directories we must 797 * read the `.' entry out of a dir. 798 */ 799 ip->iso_start = ino >> imp->im_bshift; 800 if (bp != 0) 801 brelse(bp, 0); 802 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 803 vput(vp); 804 return (error); 805 } 806 isodir = (struct iso_directory_record *)bp->b_data; 807 } 808 809 ip->iso_extent = isonum_733(isodir->extent); 810 ip->i_size = isonum_733(isodir->size); 811 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 812 813 /* 814 * Setup time stamp, attribute 815 */ 816 vp->v_type = VNON; 817 switch (imp->iso_ftype) { 818 default: /* ISO_FTYPE_9660 */ 819 { 820 struct buf *bp2; 821 int off; 822 if ((imp->im_flags & ISOFSMNT_EXTATT) 823 && (off = isonum_711(isodir->ext_attr_length))) 824 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), 825 NULL, &bp2); 826 else 827 bp2 = NULL; 828 cd9660_defattr(isodir, ip, bp2); 829 cd9660_deftstamp(isodir, ip, bp2); 830 if (bp2) 831 brelse(bp2, 0); 832 break; 833 } 834 case ISO_FTYPE_RRIP: 835 cd9660_rrip_analyze(isodir, ip, imp); 836 break; 837 } 838 839 if (bp != 0) 840 brelse(bp, 0); 841 842 /* 843 * Initialize the associated vnode 844 */ 845 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 846 case VFIFO: 847 vp->v_op = cd9660_fifoop_p; 848 break; 849 case VCHR: 850 case VBLK: 851 /* 852 * if device, look at device number table for translation 853 */ 854 vp->v_op = cd9660_specop_p; 855 spec_node_init(vp, ip->inode.iso_rdev); 856 break; 857 case VLNK: 858 case VNON: 859 case VSOCK: 860 case VDIR: 861 case VBAD: 862 break; 863 case VREG: 864 uvm_vnp_setsize(vp, ip->i_size); 865 break; 866 } 867 868 if (vp->v_type != VREG) 869 uvm_vnp_setsize(vp, 0); 870 871 if (ip->iso_extent == imp->root_extent) 872 vp->v_vflag |= VV_ROOT; 873 874 /* 875 * XXX need generation number? 876 */ 877 878 *vpp = vp; 879 return (0); 880 } 881 882 /* 883 * Vnode pointer to File handle 884 */ 885 /* ARGSUSED */ 886 int 887 cd9660_vptofh(vp, fhp, fh_size) 888 struct vnode *vp; 889 struct fid *fhp; 890 size_t *fh_size; 891 { 892 struct iso_node *ip = VTOI(vp); 893 struct ifid ifh; 894 895 if (*fh_size < sizeof(struct ifid)) { 896 *fh_size = sizeof(struct ifid); 897 return E2BIG; 898 } 899 *fh_size = sizeof(struct ifid); 900 901 memset(&ifh, 0, sizeof(ifh)); 902 ifh.ifid_len = sizeof(struct ifid); 903 ifh.ifid_ino = ip->i_number; 904 ifh.ifid_start = ip->iso_start; 905 memcpy(fhp, &ifh, sizeof(ifh)); 906 907 #ifdef ISOFS_DBG 908 printf("vptofh: ino %d, start %ld\n", 909 ifh.ifid_ino,ifh.ifid_start); 910 #endif 911 return 0; 912 } 913 914 SYSCTL_SETUP(sysctl_vfs_cd9660_setup, "sysctl vfs.cd9660 subtree setup") 915 { 916 917 sysctl_createv(clog, 0, NULL, NULL, 918 CTLFLAG_PERMANENT, CTLTYPE_NODE, "vfs", NULL, 919 NULL, 0, NULL, 0, 920 CTL_VFS, CTL_EOL); 921 sysctl_createv(clog, 0, NULL, NULL, 922 CTLFLAG_PERMANENT, CTLTYPE_NODE, "cd9660", 923 SYSCTL_DESCR("ISO-9660 file system"), 924 NULL, 0, NULL, 0, 925 CTL_VFS, 14, CTL_EOL); 926 927 sysctl_createv(clog, 0, NULL, NULL, 928 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 929 CTLTYPE_INT, "utf8_joliet", 930 SYSCTL_DESCR("Encode Joliet file names to UTF-8"), 931 NULL, 0, &cd9660_utf8_joliet, 0, 932 CTL_VFS, 14, CD9660_UTF8_JOLIET, CTL_EOL); 933 934 } 935
Indexes created Fri Sep 26 20:09:58 GMT 2025