cd9660_vfsops.c revision 1.74.6.1
1 /* $NetBSD: cd9660_vfsops.c,v 1.74.6.1 2014/04/21 10:14:18 bouyer 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 1.74.6.1 2014/04/21 10:14:18 bouyer 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 #include <sys/module.h> 70 71 #include <fs/cd9660/iso.h> 72 #include <fs/cd9660/cd9660_extern.h> 73 #include <fs/cd9660/iso_rrip.h> 74 #include <fs/cd9660/cd9660_node.h> 75 #include <fs/cd9660/cd9660_mount.h> 76 77 MODULE(MODULE_CLASS_VFS, cd9660, NULL); 78 79 MALLOC_JUSTDEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure"); 80 81 static struct sysctllog *cd9660_sysctl_log; 82 83 extern const struct vnodeopv_desc cd9660_vnodeop_opv_desc; 84 extern const struct vnodeopv_desc cd9660_specop_opv_desc; 85 extern const struct vnodeopv_desc cd9660_fifoop_opv_desc; 86 87 const struct vnodeopv_desc * const cd9660_vnodeopv_descs[] = { 88 &cd9660_vnodeop_opv_desc, 89 &cd9660_specop_opv_desc, 90 &cd9660_fifoop_opv_desc, 91 NULL, 92 }; 93 94 struct vfsops cd9660_vfsops = { 95 MOUNT_CD9660, 96 sizeof (struct iso_args), 97 cd9660_mount, 98 cd9660_start, 99 cd9660_unmount, 100 cd9660_root, 101 (void *)eopnotsupp, 102 cd9660_statvfs, 103 cd9660_sync, 104 cd9660_vget, 105 cd9660_fhtovp, 106 cd9660_vptofh, 107 cd9660_init, 108 cd9660_reinit, 109 cd9660_done, 110 cd9660_mountroot, 111 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 112 vfs_stdextattrctl, 113 (void *)eopnotsupp, /* vfs_suspendctl */ 114 genfs_renamelock_enter, 115 genfs_renamelock_exit, 116 (void *)eopnotsupp, 117 cd9660_vnodeopv_descs, 118 0, /* refcount */ 119 { NULL, NULL } /* list */ 120 }; 121 122 static const struct genfs_ops cd9660_genfsops = { 123 .gop_size = genfs_size, 124 }; 125 126 /* 127 * Called by vfs_mountroot when iso is going to be mounted as root. 128 * 129 * Name is updated by mount(8) after booting. 130 */ 131 #define ROOTNAME "root_device" 132 133 static int iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len); 134 static int iso_mountfs(struct vnode *devvp, struct mount *mp, 135 struct lwp *l, struct iso_args *argp); 136 137 static int 138 cd9660_modcmd(modcmd_t cmd, void *arg) 139 { 140 int error; 141 142 switch (cmd) { 143 case MODULE_CMD_INIT: 144 error = vfs_attach(&cd9660_vfsops); 145 if (error != 0) 146 break; 147 sysctl_createv(&cd9660_sysctl_log, 0, NULL, NULL, 148 CTLFLAG_PERMANENT, CTLTYPE_NODE, "vfs", NULL, 149 NULL, 0, NULL, 0, 150 CTL_VFS, CTL_EOL); 151 sysctl_createv(&cd9660_sysctl_log, 0, NULL, NULL, 152 CTLFLAG_PERMANENT, CTLTYPE_NODE, "cd9660", 153 SYSCTL_DESCR("ISO-9660 file system"), 154 NULL, 0, NULL, 0, 155 CTL_VFS, 14, CTL_EOL); 156 sysctl_createv(&cd9660_sysctl_log, 0, NULL, NULL, 157 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 158 CTLTYPE_INT, "utf8_joliet", 159 SYSCTL_DESCR("Encode Joliet filenames to UTF-8"), 160 NULL, 0, &cd9660_utf8_joliet, 0, 161 CTL_VFS, 14, CD9660_UTF8_JOLIET, CTL_EOL); 162 /* 163 * XXX the "14" above could be dynamic, thereby eliminating 164 * one more instance of the "number to vfs" mapping problem, 165 * but "14" is the order as taken from sys/mount.h 166 */ 167 break; 168 case MODULE_CMD_FINI: 169 error = vfs_detach(&cd9660_vfsops); 170 if (error != 0) 171 break; 172 sysctl_teardown(&cd9660_sysctl_log); 173 break; 174 default: 175 error = ENOTTY; 176 break; 177 } 178 179 return (error); 180 } 181 182 int 183 cd9660_mountroot(void) 184 { 185 struct mount *mp; 186 struct lwp *l = curlwp; 187 int error; 188 struct iso_args args; 189 190 if (device_class(root_device) != DV_DISK) 191 return (ENODEV); 192 193 if ((error = vfs_rootmountalloc(MOUNT_CD9660, "root_device", &mp)) 194 != 0) { 195 vrele(rootvp); 196 return (error); 197 } 198 199 args.flags = ISOFSMNT_ROOT; 200 if ((error = iso_mountfs(rootvp, mp, l, &args)) != 0) { 201 vfs_unbusy(mp, false, NULL); 202 vfs_destroy(mp); 203 return (error); 204 } 205 mutex_enter(&mountlist_lock); 206 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 207 mutex_exit(&mountlist_lock); 208 (void)cd9660_statvfs(mp, &mp->mnt_stat); 209 vfs_unbusy(mp, false, NULL); 210 return (0); 211 } 212 213 /* 214 * VFS Operations. 215 * 216 * mount system call 217 */ 218 int 219 cd9660_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 220 { 221 struct lwp *l = curlwp; 222 struct vnode *devvp; 223 struct iso_args *args = data; 224 int error; 225 struct iso_mnt *imp = VFSTOISOFS(mp); 226 227 if (args == NULL) 228 return EINVAL; 229 if (*data_len < sizeof *args) 230 return EINVAL; 231 232 if (mp->mnt_flag & MNT_GETARGS) { 233 if (imp == NULL) 234 return EIO; 235 args->fspec = NULL; 236 args->flags = imp->im_flags; 237 *data_len = sizeof (*args); 238 return 0; 239 } 240 241 if ((mp->mnt_flag & MNT_RDONLY) == 0) 242 return (EROFS); 243 244 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 245 return EINVAL; 246 247 /* 248 * Not an update, or updating the name: look up the name 249 * and verify that it refers to a sensible block device. 250 */ 251 error = namei_simple_user(args->fspec, 252 NSM_FOLLOW_NOEMULROOT, &devvp); 253 if (error != 0) 254 return (error); 255 256 if (devvp->v_type != VBLK) { 257 vrele(devvp); 258 return ENOTBLK; 259 } 260 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 261 vrele(devvp); 262 return ENXIO; 263 } 264 /* 265 * If mount by non-root, then verify that user has necessary 266 * permissions on the device. 267 */ 268 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 269 error = genfs_can_mount(devvp, VREAD, l->l_cred); 270 VOP_UNLOCK(devvp); 271 if (error) { 272 vrele(devvp); 273 return (error); 274 } 275 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 276 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 277 error = VOP_OPEN(devvp, FREAD, FSCRED); 278 VOP_UNLOCK(devvp); 279 if (error) 280 goto fail; 281 error = iso_mountfs(devvp, mp, l, args); 282 if (error) { 283 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 284 (void)VOP_CLOSE(devvp, FREAD, NOCRED); 285 VOP_UNLOCK(devvp); 286 goto fail; 287 } 288 } else { 289 vrele(devvp); 290 if (devvp != imp->im_devvp && 291 devvp->v_rdev != imp->im_devvp->v_rdev) 292 return (EINVAL); /* needs translation */ 293 } 294 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 295 mp->mnt_op->vfs_name, mp, l); 296 297 fail: 298 vrele(devvp); 299 return (error); 300 } 301 302 /* 303 * Make a mount point from a volume descriptor 304 */ 305 static int 306 iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len) 307 { 308 struct iso_primary_descriptor *pri; 309 int logical_block_size; 310 struct iso_directory_record *rootp; 311 312 pri = (struct iso_primary_descriptor *)bp->b_data; 313 314 logical_block_size = isonum_723 (pri->logical_block_size); 315 316 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 317 || (logical_block_size & (logical_block_size - 1)) != 0) 318 return -1; 319 320 rootp = (struct iso_directory_record *)pri->root_directory_record; 321 322 isomp->logical_block_size = logical_block_size; 323 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 324 memcpy(isomp->root, rootp, sizeof(isomp->root)); 325 isomp->root_extent = isonum_733 (rootp->extent); 326 isomp->root_size = isonum_733 (rootp->size); 327 isomp->im_joliet_level = 0; 328 329 isomp->im_bmask = logical_block_size - 1; 330 isomp->im_bshift = 0; 331 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 332 isomp->im_bshift++; 333 334 if (ea_len != NULL) 335 *ea_len = isonum_711(rootp->ext_attr_length); 336 337 return 0; 338 } 339 340 /* 341 * Common code for mount and mountroot 342 */ 343 static int 344 iso_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, 345 struct iso_args *argp) 346 { 347 struct iso_mnt *isomp = (struct iso_mnt *)0; 348 struct buf *bp = NULL, *pribp = NULL, *supbp = NULL; 349 dev_t dev = devvp->v_rdev; 350 int error = EINVAL; 351 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 352 int iso_bsize; 353 int iso_blknum; 354 int joliet_level; 355 struct iso_volume_descriptor *vdp; 356 struct iso_supplementary_descriptor *sup; 357 int sess = 0; 358 int ext_attr_length; 359 struct disklabel label; 360 361 if (!ronly) 362 return EROFS; 363 364 /* Flush out any old buffers remaining from a previous use. */ 365 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 366 return (error); 367 368 /* This is the "logical sector size". The standard says this 369 * should be 2048 or the physical sector size on the device, 370 * whichever is greater. For now, we'll just use a constant. 371 */ 372 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 373 374 error = VOP_IOCTL(devvp, DIOCGDINFO, &label, FREAD, FSCRED); 375 if (!error) { 376 /* XXX more sanity checks? */ 377 sess = label.d_partitions[DISKPART(dev)].p_cdsession; 378 } else { 379 /* fallback to old method */ 380 error = VOP_IOCTL(devvp, CDIOREADMSADDR, &sess, 0, FSCRED); 381 if (error) 382 sess = 0; /* never mind */ 383 } 384 #ifdef ISO_DEBUG 385 printf("isofs: session offset (part %"PRId32") %d\n", DISKPART(dev), sess); 386 #endif 387 388 for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { 389 if ((error = bread(devvp, (iso_blknum+sess) * btodb(iso_bsize), 390 iso_bsize, NOCRED, 0, &bp)) != 0) 391 goto out; 392 393 vdp = (struct iso_volume_descriptor *)bp->b_data; 394 if (memcmp(vdp->id, ISO_STANDARD_ID, sizeof(vdp->id)) != 0) { 395 error = EINVAL; 396 goto out; 397 } 398 399 switch (isonum_711(vdp->type)) { 400 case ISO_VD_PRIMARY: 401 if (pribp == NULL) { 402 pribp = bp; 403 bp = NULL; 404 } 405 break; 406 407 case ISO_VD_SUPPLEMENTARY: 408 if (supbp == NULL) { 409 supbp = bp; 410 bp = NULL; 411 } 412 break; 413 414 default: 415 break; 416 } 417 418 if (isonum_711 (vdp->type) == ISO_VD_END) { 419 brelse(bp, 0); 420 bp = NULL; 421 break; 422 } 423 424 if (bp != NULL) { 425 brelse(bp, 0); 426 bp = NULL; 427 } 428 } 429 430 if (pribp == NULL) { 431 error = EINVAL; 432 goto out; 433 } 434 435 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); 436 memset(isomp, 0, sizeof *isomp); 437 if (iso_makemp(isomp, pribp, &ext_attr_length) == -1) { 438 error = EINVAL; 439 goto out; 440 } 441 442 isomp->volume_space_size += sess; 443 444 brelse(pribp, BC_AGE); 445 pribp = NULL; 446 447 mp->mnt_data = isomp; 448 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 449 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CD9660); 450 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 451 mp->mnt_stat.f_namemax = ISO_MAXNAMLEN; 452 mp->mnt_flag |= MNT_LOCAL; 453 mp->mnt_iflag |= IMNT_MPSAFE; 454 mp->mnt_dev_bshift = iso_bsize; 455 mp->mnt_fs_bshift = isomp->im_bshift; 456 isomp->im_mountp = mp; 457 isomp->im_dev = dev; 458 isomp->im_devvp = devvp; 459 460 /* Check the Rock Ridge Extension support */ 461 if (!(argp->flags & ISOFSMNT_NORRIP)) { 462 struct iso_directory_record *rootp; 463 464 if ((error = bread(isomp->im_devvp, 465 (isomp->root_extent + ext_attr_length) << 466 (isomp->im_bshift - DEV_BSHIFT), 467 isomp->logical_block_size, NOCRED, 468 0, &bp)) != 0) 469 goto out; 470 471 rootp = (struct iso_directory_record *)bp->b_data; 472 473 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 474 argp->flags |= ISOFSMNT_NORRIP; 475 } else { 476 argp->flags &= ~ISOFSMNT_GENS; 477 } 478 479 /* 480 * The contents are valid, 481 * but they will get reread as part of another vnode, so... 482 */ 483 brelse(bp, BC_AGE); 484 bp = NULL; 485 } 486 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 487 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | ISOFSMNT_RRCASEINS); 488 489 if (isomp->im_flags & ISOFSMNT_GENS) 490 isomp->iso_ftype = ISO_FTYPE_9660; 491 else if (isomp->im_flags & ISOFSMNT_NORRIP) { 492 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 493 if (argp->flags & ISOFSMNT_NOCASETRANS) 494 isomp->im_flags |= ISOFSMNT_NOCASETRANS; 495 } else 496 isomp->iso_ftype = ISO_FTYPE_RRIP; 497 498 /* Check the Joliet Extension support */ 499 if ((argp->flags & ISOFSMNT_NORRIP) != 0 && 500 (argp->flags & ISOFSMNT_NOJOLIET) == 0 && 501 supbp != NULL) { 502 joliet_level = 0; 503 sup = (struct iso_supplementary_descriptor *)supbp->b_data; 504 505 if ((isonum_711(sup->flags) & 1) == 0) { 506 if (memcmp(sup->escape, "%/@", 3) == 0) 507 joliet_level = 1; 508 if (memcmp(sup->escape, "%/C", 3) == 0) 509 joliet_level = 2; 510 if (memcmp(sup->escape, "%/E", 3) == 0) 511 joliet_level = 3; 512 } 513 if (joliet_level != 0) { 514 if (iso_makemp(isomp, supbp, NULL) == -1) { 515 error = EINVAL; 516 goto out; 517 } 518 isomp->im_joliet_level = joliet_level; 519 } 520 } 521 522 if (supbp != NULL) { 523 brelse(supbp, 0); 524 supbp = NULL; 525 } 526 527 devvp->v_specmountpoint = mp; 528 529 return 0; 530 out: 531 if (bp) 532 brelse(bp, 0); 533 if (pribp) 534 brelse(pribp, 0); 535 if (supbp) 536 brelse(supbp, 0); 537 if (isomp) { 538 free(isomp, M_ISOFSMNT); 539 mp->mnt_data = NULL; 540 } 541 return error; 542 } 543 544 /* 545 * Make a filesystem operational. 546 * Nothing to do at the moment. 547 */ 548 /* ARGSUSED */ 549 int 550 cd9660_start(struct mount *mp, int flags) 551 { 552 return 0; 553 } 554 555 /* 556 * unmount system call 557 */ 558 int 559 cd9660_unmount(struct mount *mp, int mntflags) 560 { 561 struct iso_mnt *isomp; 562 int error, flags = 0; 563 564 if (mntflags & MNT_FORCE) 565 flags |= FORCECLOSE; 566 if ((error = vflush(mp, NULLVP, flags)) != 0) 567 return (error); 568 569 isomp = VFSTOISOFS(mp); 570 571 if (isomp->im_devvp->v_type != VBAD) 572 isomp->im_devvp->v_specmountpoint = NULL; 573 574 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 575 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED); 576 vput(isomp->im_devvp); 577 free(isomp, M_ISOFSMNT); 578 mp->mnt_data = NULL; 579 mp->mnt_flag &= ~MNT_LOCAL; 580 return (error); 581 } 582 583 /* 584 * Return root of a filesystem 585 */ 586 int 587 cd9660_root(struct mount *mp, struct vnode **vpp) 588 { 589 struct iso_mnt *imp = VFSTOISOFS(mp); 590 struct iso_directory_record *dp = 591 (struct iso_directory_record *)imp->root; 592 ino_t ino = isodirino(dp, imp); 593 594 /* 595 * With RRIP we must use the `.' entry of the root directory. 596 * Simply tell vget, that it's a relocated directory. 597 */ 598 return (cd9660_vget_internal(mp, ino, vpp, 599 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 600 } 601 602 /* 603 * Get file system statistics. 604 */ 605 int 606 cd9660_statvfs(struct mount *mp, struct statvfs *sbp) 607 { 608 struct iso_mnt *isomp; 609 610 isomp = VFSTOISOFS(mp); 611 612 sbp->f_bsize = isomp->logical_block_size; 613 sbp->f_frsize = sbp->f_bsize; 614 sbp->f_iosize = sbp->f_bsize; /* XXX */ 615 sbp->f_blocks = isomp->volume_space_size; 616 sbp->f_bfree = 0; /* total free blocks */ 617 sbp->f_bavail = 0; /* blocks free for non superuser */ 618 sbp->f_bresvd = 0; /* total reserved blocks */ 619 sbp->f_files = 0; /* total files */ 620 sbp->f_ffree = 0; /* free file nodes */ 621 sbp->f_favail = 0; /* free file nodes for non superuser */ 622 sbp->f_fresvd = 0; /* reserved file nodes */ 623 copy_statvfs_info(sbp, mp); 624 /* Use the first spare for flags: */ 625 sbp->f_spare[0] = isomp->im_flags; 626 return 0; 627 } 628 629 /* ARGSUSED */ 630 int 631 cd9660_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 632 { 633 return 0; 634 } 635 636 /* 637 * File handle to vnode 638 * 639 * Have to be really careful about stale file handles: 640 * - check that the inode number is in range 641 * - call iget() to get the locked inode 642 * - check for an unallocated inode (i_mode == 0) 643 * - check that the generation number matches 644 */ 645 646 struct ifid { 647 ushort ifid_len; 648 ushort ifid_pad; 649 int ifid_ino; 650 long ifid_start; 651 }; 652 653 /* ARGSUSED */ 654 int 655 cd9660_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 656 { 657 struct ifid ifh; 658 struct iso_node *ip; 659 struct vnode *nvp; 660 int error; 661 662 if (fhp->fid_len != sizeof(ifh)) 663 return EINVAL; 664 665 memcpy(&ifh, fhp, sizeof(ifh)); 666 #ifdef ISOFS_DBG 667 printf("fhtovp: ino %d, start %ld\n", 668 ifh.ifid_ino, ifh.ifid_start); 669 #endif 670 671 if ((error = VFS_VGET(mp, ifh.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_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 687 { 688 689 /* 690 * XXXX 691 * It would be nice if we didn't always set the `relocated' flag 692 * and force the extra read, but I don't want to think about fixing 693 * that right now. 694 */ 695 return (cd9660_vget_internal(mp, ino, vpp, 696 #if 0 697 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 698 #else 699 0, 700 #endif 701 NULL)); 702 } 703 704 int 705 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp, 706 int relocated, struct iso_directory_record *isodir) 707 { 708 struct iso_mnt *imp; 709 struct iso_node *ip; 710 struct buf *bp; 711 struct vnode *vp; 712 dev_t dev; 713 int error; 714 715 imp = VFSTOISOFS(mp); 716 dev = imp->im_dev; 717 718 retry: 719 if ((*vpp = cd9660_ihashget(dev, ino, LK_EXCLUSIVE)) != NULLVP) 720 return (0); 721 722 /* Allocate a new vnode/iso_node. */ 723 error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, NULL, &vp); 724 if (error) { 725 *vpp = NULLVP; 726 return (error); 727 } 728 ip = pool_get(&cd9660_node_pool, PR_WAITOK); 729 730 /* 731 * If someone beat us to it, put back the freshly allocated 732 * vnode/inode pair and retry. 733 */ 734 mutex_enter(&cd9660_hashlock); 735 if (cd9660_ihashget(dev, ino, 0) != NULL) { 736 mutex_exit(&cd9660_hashlock); 737 ungetnewvnode(vp); 738 pool_put(&cd9660_node_pool, ip); 739 goto retry; 740 } 741 742 memset(ip, 0, sizeof(struct iso_node)); 743 vp->v_data = ip; 744 ip->i_vnode = vp; 745 ip->i_dev = dev; 746 ip->i_number = ino; 747 ip->i_mnt = imp; 748 ip->i_devvp = imp->im_devvp; 749 genfs_node_init(vp, &cd9660_genfsops); 750 751 /* 752 * Put it onto its hash chain and lock it so that other requests for 753 * this inode will block if they arrive while we are sleeping waiting 754 * for old data structures to be purged or for the contents of the 755 * disk portion of this inode to be read. 756 */ 757 cd9660_ihashins(ip); 758 mutex_exit(&cd9660_hashlock); 759 760 if (isodir == 0) { 761 int lbn, off; 762 763 lbn = lblkno(imp, ino); 764 if (lbn >= imp->volume_space_size) { 765 vput(vp); 766 printf("fhtovp: lbn exceed volume space %d\n", lbn); 767 return (ESTALE); 768 } 769 770 off = blkoff(imp, ino); 771 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 772 vput(vp); 773 printf("fhtovp: crosses block boundary %d\n", 774 off + ISO_DIRECTORY_RECORD_SIZE); 775 return (ESTALE); 776 } 777 778 error = bread(imp->im_devvp, 779 lbn << (imp->im_bshift - DEV_BSHIFT), 780 imp->logical_block_size, NOCRED, 0, &bp); 781 if (error) { 782 vput(vp); 783 brelse(bp, 0); 784 printf("fhtovp: bread error %d\n",error); 785 return (error); 786 } 787 isodir = (struct iso_directory_record *)((char *)bp->b_data + off); 788 789 if (off + isonum_711(isodir->length) > 790 imp->logical_block_size) { 791 vput(vp); 792 if (bp != 0) 793 brelse(bp, 0); 794 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 795 off +isonum_711(isodir->length), off, 796 isonum_711(isodir->length)); 797 return (ESTALE); 798 } 799 800 #if 0 801 if (isonum_733(isodir->extent) + 802 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 803 if (bp != 0) 804 brelse(bp, 0); 805 printf("fhtovp: file start miss %d vs %d\n", 806 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 807 ifhp->ifid_start); 808 return (ESTALE); 809 } 810 #endif 811 } else 812 bp = 0; 813 814 vref(ip->i_devvp); 815 816 if (relocated) { 817 /* 818 * On relocated directories we must 819 * read the `.' entry out of a dir. 820 */ 821 ip->iso_start = ino >> imp->im_bshift; 822 if (bp != 0) 823 brelse(bp, 0); 824 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 825 vput(vp); 826 return (error); 827 } 828 isodir = (struct iso_directory_record *)bp->b_data; 829 } 830 831 ip->iso_extent = isonum_733(isodir->extent); 832 ip->i_size = isonum_733(isodir->size); 833 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 834 835 /* 836 * Setup time stamp, attribute 837 */ 838 vp->v_type = VNON; 839 switch (imp->iso_ftype) { 840 default: /* ISO_FTYPE_9660 */ 841 { 842 struct buf *bp2; 843 int off; 844 if ((imp->im_flags & ISOFSMNT_EXTATT) 845 && (off = isonum_711(isodir->ext_attr_length))) 846 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), 847 NULL, &bp2); 848 else 849 bp2 = NULL; 850 cd9660_defattr(isodir, ip, bp2); 851 cd9660_deftstamp(isodir, ip, bp2); 852 if (bp2) 853 brelse(bp2, 0); 854 break; 855 } 856 case ISO_FTYPE_RRIP: 857 cd9660_rrip_analyze(isodir, ip, imp); 858 break; 859 } 860 861 if (bp != 0) 862 brelse(bp, 0); 863 864 /* 865 * Initialize the associated vnode 866 */ 867 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 868 case VFIFO: 869 vp->v_op = cd9660_fifoop_p; 870 break; 871 case VCHR: 872 case VBLK: 873 /* 874 * if device, look at device number table for translation 875 */ 876 vp->v_op = cd9660_specop_p; 877 spec_node_init(vp, ip->inode.iso_rdev); 878 break; 879 case VLNK: 880 case VNON: 881 case VSOCK: 882 case VDIR: 883 case VBAD: 884 break; 885 case VREG: 886 uvm_vnp_setsize(vp, ip->i_size); 887 break; 888 } 889 890 if (vp->v_type != VREG) 891 uvm_vnp_setsize(vp, 0); 892 893 if (ip->iso_extent == imp->root_extent) 894 vp->v_vflag |= VV_ROOT; 895 896 /* 897 * XXX need generation number? 898 */ 899 900 *vpp = vp; 901 return (0); 902 } 903 904 /* 905 * Vnode pointer to File handle 906 */ 907 /* ARGSUSED */ 908 int 909 cd9660_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 910 { 911 struct iso_node *ip = VTOI(vp); 912 struct ifid ifh; 913 914 if (*fh_size < sizeof(struct ifid)) { 915 *fh_size = sizeof(struct ifid); 916 return E2BIG; 917 } 918 *fh_size = sizeof(struct ifid); 919 920 memset(&ifh, 0, sizeof(ifh)); 921 ifh.ifid_len = sizeof(struct ifid); 922 ifh.ifid_ino = ip->i_number; 923 ifh.ifid_start = ip->iso_start; 924 memcpy(fhp, &ifh, sizeof(ifh)); 925 926 #ifdef ISOFS_DBG 927 printf("vptofh: ino %d, start %ld\n", 928 ifh.ifid_ino,ifh.ifid_start); 929 #endif 930 return 0; 931 } 932
Indexes created Mon Oct 20 11:09:49 GMT 2025