cd9660_vfsops.c revision 1.82
1 /* $NetBSD: cd9660_vfsops.c,v 1.82 2014/03/23 15:21:15 hannken 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 1.82 2014/03/23 15:21:15 hannken 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 .vfs_name = MOUNT_CD9660, 96 .vfs_min_mount_data = sizeof (struct iso_args), 97 .vfs_mount = cd9660_mount, 98 .vfs_start = cd9660_start, 99 .vfs_unmount = cd9660_unmount, 100 .vfs_root = cd9660_root, 101 .vfs_quotactl = (void *)eopnotsupp, 102 .vfs_statvfs = cd9660_statvfs, 103 .vfs_sync = cd9660_sync, 104 .vfs_vget = cd9660_vget, 105 .vfs_fhtovp = cd9660_fhtovp, 106 .vfs_vptofh = cd9660_vptofh, 107 .vfs_init = cd9660_init, 108 .vfs_reinit = cd9660_reinit, 109 .vfs_done = cd9660_done, 110 .vfs_mountroot = cd9660_mountroot, 111 .vfs_snapshot = (void *)eopnotsupp, 112 .vfs_extattrctl = vfs_stdextattrctl, 113 .vfs_suspendctl = (void *)eopnotsupp, 114 .vfs_renamelock_enter = genfs_renamelock_enter, 115 .vfs_renamelock_exit = genfs_renamelock_exit, 116 .vfs_fsync = (void *)eopnotsupp, 117 .vfs_opv_descs = cd9660_vnodeopv_descs 118 }; 119 120 static const struct genfs_ops cd9660_genfsops = { 121 .gop_size = genfs_size, 122 }; 123 124 /* 125 * Called by vfs_mountroot when iso is going to be mounted as root. 126 * 127 * Name is updated by mount(8) after booting. 128 */ 129 #define ROOTNAME "root_device" 130 131 static int iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len); 132 static int iso_mountfs(struct vnode *devvp, struct mount *mp, 133 struct lwp *l, struct iso_args *argp); 134 135 static int 136 cd9660_modcmd(modcmd_t cmd, void *arg) 137 { 138 int error; 139 140 switch (cmd) { 141 case MODULE_CMD_INIT: 142 error = vfs_attach(&cd9660_vfsops); 143 if (error != 0) 144 break; 145 sysctl_createv(&cd9660_sysctl_log, 0, NULL, NULL, 146 CTLFLAG_PERMANENT, CTLTYPE_NODE, "cd9660", 147 SYSCTL_DESCR("ISO-9660 file system"), 148 NULL, 0, NULL, 0, 149 CTL_VFS, 14, CTL_EOL); 150 sysctl_createv(&cd9660_sysctl_log, 0, NULL, NULL, 151 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 152 CTLTYPE_INT, "utf8_joliet", 153 SYSCTL_DESCR("Encode Joliet filenames to UTF-8"), 154 NULL, 0, &cd9660_utf8_joliet, 0, 155 CTL_VFS, 14, CD9660_UTF8_JOLIET, CTL_EOL); 156 /* 157 * XXX the "14" above could be dynamic, thereby eliminating 158 * one more instance of the "number to vfs" mapping problem, 159 * but "14" is the order as taken from sys/mount.h 160 */ 161 break; 162 case MODULE_CMD_FINI: 163 error = vfs_detach(&cd9660_vfsops); 164 if (error != 0) 165 break; 166 sysctl_teardown(&cd9660_sysctl_log); 167 break; 168 default: 169 error = ENOTTY; 170 break; 171 } 172 173 return (error); 174 } 175 176 int 177 cd9660_mountroot(void) 178 { 179 struct mount *mp; 180 struct lwp *l = curlwp; 181 int error; 182 struct iso_args args; 183 184 if (device_class(root_device) != DV_DISK) 185 return (ENODEV); 186 187 if ((error = vfs_rootmountalloc(MOUNT_CD9660, "root_device", &mp)) 188 != 0) { 189 vrele(rootvp); 190 return (error); 191 } 192 193 args.flags = ISOFSMNT_ROOT; 194 if ((error = iso_mountfs(rootvp, mp, l, &args)) != 0) { 195 vfs_unbusy(mp, false, NULL); 196 vfs_destroy(mp); 197 return (error); 198 } 199 mountlist_append(mp); 200 (void)cd9660_statvfs(mp, &mp->mnt_stat); 201 vfs_unbusy(mp, false, NULL); 202 return (0); 203 } 204 205 /* 206 * VFS Operations. 207 * 208 * mount system call 209 */ 210 int 211 cd9660_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 212 { 213 struct lwp *l = curlwp; 214 struct vnode *devvp; 215 struct iso_args *args = data; 216 int error; 217 struct iso_mnt *imp = VFSTOISOFS(mp); 218 219 if (*data_len < sizeof *args) 220 return EINVAL; 221 222 if (mp->mnt_flag & MNT_GETARGS) { 223 if (imp == NULL) 224 return EIO; 225 args->fspec = NULL; 226 args->flags = imp->im_flags; 227 *data_len = sizeof (*args); 228 return 0; 229 } 230 231 if ((mp->mnt_flag & MNT_RDONLY) == 0) 232 return (EROFS); 233 234 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 235 return EINVAL; 236 237 /* 238 * Not an update, or updating the name: look up the name 239 * and verify that it refers to a sensible block device. 240 */ 241 error = namei_simple_user(args->fspec, 242 NSM_FOLLOW_NOEMULROOT, &devvp); 243 if (error != 0) 244 return (error); 245 246 if (devvp->v_type != VBLK) { 247 vrele(devvp); 248 return ENOTBLK; 249 } 250 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 251 vrele(devvp); 252 return ENXIO; 253 } 254 /* 255 * If mount by non-root, then verify that user has necessary 256 * permissions on the device. 257 */ 258 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 259 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 260 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD)); 261 VOP_UNLOCK(devvp); 262 if (error) { 263 vrele(devvp); 264 return (error); 265 } 266 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 267 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 268 error = VOP_OPEN(devvp, FREAD, FSCRED); 269 VOP_UNLOCK(devvp); 270 if (error) 271 goto fail; 272 error = iso_mountfs(devvp, mp, l, args); 273 if (error) { 274 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 275 (void)VOP_CLOSE(devvp, FREAD, NOCRED); 276 VOP_UNLOCK(devvp); 277 goto fail; 278 } 279 } else { 280 vrele(devvp); 281 if (devvp != imp->im_devvp && 282 devvp->v_rdev != imp->im_devvp->v_rdev) 283 return (EINVAL); /* needs translation */ 284 } 285 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 286 mp->mnt_op->vfs_name, mp, l); 287 288 fail: 289 vrele(devvp); 290 return (error); 291 } 292 293 /* 294 * Make a mount point from a volume descriptor 295 */ 296 static int 297 iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len) 298 { 299 struct iso_primary_descriptor *pri; 300 int logical_block_size; 301 struct iso_directory_record *rootp; 302 303 pri = (struct iso_primary_descriptor *)bp->b_data; 304 305 logical_block_size = isonum_723 (pri->logical_block_size); 306 307 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 308 || (logical_block_size & (logical_block_size - 1)) != 0) 309 return -1; 310 311 rootp = (struct iso_directory_record *)pri->root_directory_record; 312 313 isomp->logical_block_size = logical_block_size; 314 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 315 memcpy(isomp->root, rootp, sizeof(isomp->root)); 316 isomp->root_extent = isonum_733 (rootp->extent); 317 isomp->root_size = isonum_733 (rootp->size); 318 isomp->im_joliet_level = 0; 319 320 isomp->im_bmask = logical_block_size - 1; 321 isomp->im_bshift = 0; 322 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 323 isomp->im_bshift++; 324 325 if (ea_len != NULL) 326 *ea_len = isonum_711(rootp->ext_attr_length); 327 328 return 0; 329 } 330 331 /* 332 * Common code for mount and mountroot 333 */ 334 static int 335 iso_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, 336 struct iso_args *argp) 337 { 338 struct iso_mnt *isomp = (struct iso_mnt *)0; 339 struct buf *bp = NULL, *pribp = NULL, *supbp = NULL; 340 dev_t dev = devvp->v_rdev; 341 int error = EINVAL; 342 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 343 int iso_bsize; 344 int iso_blknum; 345 int joliet_level; 346 struct iso_volume_descriptor *vdp; 347 struct iso_supplementary_descriptor *sup; 348 int sess = 0; 349 int ext_attr_length; 350 struct disklabel label; 351 352 if (!ronly) 353 return EROFS; 354 355 /* Flush out any old buffers remaining from a previous use. */ 356 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 357 return (error); 358 359 /* This is the "logical sector size". The standard says this 360 * should be 2048 or the physical sector size on the device, 361 * whichever is greater. For now, we'll just use a constant. 362 */ 363 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 364 365 error = VOP_IOCTL(devvp, DIOCGDINFO, &label, FREAD, FSCRED); 366 if (!error) { 367 /* XXX more sanity checks? */ 368 sess = label.d_partitions[DISKPART(dev)].p_cdsession; 369 } else { 370 /* fallback to old method */ 371 error = VOP_IOCTL(devvp, CDIOREADMSADDR, &sess, 0, FSCRED); 372 if (error) 373 sess = 0; /* never mind */ 374 } 375 #ifdef ISO_DEBUG 376 printf("isofs: session offset (part %"PRId32") %d\n", DISKPART(dev), sess); 377 #endif 378 379 for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { 380 if ((error = bread(devvp, (iso_blknum+sess) * btodb(iso_bsize), 381 iso_bsize, NOCRED, 0, &bp)) != 0) 382 goto out; 383 384 vdp = (struct iso_volume_descriptor *)bp->b_data; 385 if (memcmp(vdp->id, ISO_STANDARD_ID, sizeof(vdp->id)) != 0) { 386 error = EINVAL; 387 goto out; 388 } 389 390 switch (isonum_711(vdp->type)) { 391 case ISO_VD_PRIMARY: 392 if (pribp == NULL) { 393 pribp = bp; 394 bp = NULL; 395 } 396 break; 397 398 case ISO_VD_SUPPLEMENTARY: 399 if (supbp == NULL) { 400 supbp = bp; 401 bp = NULL; 402 } 403 break; 404 405 default: 406 break; 407 } 408 409 if (isonum_711 (vdp->type) == ISO_VD_END) { 410 brelse(bp, 0); 411 bp = NULL; 412 break; 413 } 414 415 if (bp != NULL) { 416 brelse(bp, 0); 417 bp = NULL; 418 } 419 } 420 421 if (pribp == NULL) { 422 error = EINVAL; 423 goto out; 424 } 425 426 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); 427 memset(isomp, 0, sizeof *isomp); 428 if (iso_makemp(isomp, pribp, &ext_attr_length) == -1) { 429 error = EINVAL; 430 goto out; 431 } 432 433 isomp->volume_space_size += sess; 434 435 brelse(pribp, BC_AGE); 436 pribp = NULL; 437 438 mp->mnt_data = isomp; 439 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 440 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CD9660); 441 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 442 mp->mnt_stat.f_namemax = ISO_MAXNAMLEN; 443 mp->mnt_flag |= MNT_LOCAL; 444 mp->mnt_iflag |= IMNT_MPSAFE; 445 mp->mnt_dev_bshift = iso_bsize; 446 mp->mnt_fs_bshift = isomp->im_bshift; 447 isomp->im_mountp = mp; 448 isomp->im_dev = dev; 449 isomp->im_devvp = devvp; 450 451 /* Check the Rock Ridge Extension support */ 452 if (!(argp->flags & ISOFSMNT_NORRIP)) { 453 struct iso_directory_record *rootp; 454 455 if ((error = bread(isomp->im_devvp, 456 (isomp->root_extent + ext_attr_length) << 457 (isomp->im_bshift - DEV_BSHIFT), 458 isomp->logical_block_size, NOCRED, 459 0, &bp)) != 0) 460 goto out; 461 462 rootp = (struct iso_directory_record *)bp->b_data; 463 464 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 465 argp->flags |= ISOFSMNT_NORRIP; 466 } else { 467 argp->flags &= ~ISOFSMNT_GENS; 468 } 469 470 /* 471 * The contents are valid, 472 * but they will get reread as part of another vnode, so... 473 */ 474 brelse(bp, BC_AGE); 475 bp = NULL; 476 } 477 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 478 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | ISOFSMNT_RRCASEINS); 479 480 if (isomp->im_flags & ISOFSMNT_GENS) 481 isomp->iso_ftype = ISO_FTYPE_9660; 482 else if (isomp->im_flags & ISOFSMNT_NORRIP) { 483 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 484 if (argp->flags & ISOFSMNT_NOCASETRANS) 485 isomp->im_flags |= ISOFSMNT_NOCASETRANS; 486 } else 487 isomp->iso_ftype = ISO_FTYPE_RRIP; 488 489 /* Check the Joliet Extension support */ 490 if ((argp->flags & ISOFSMNT_NORRIP) != 0 && 491 (argp->flags & ISOFSMNT_NOJOLIET) == 0 && 492 supbp != NULL) { 493 joliet_level = 0; 494 sup = (struct iso_supplementary_descriptor *)supbp->b_data; 495 496 if ((isonum_711(sup->flags) & 1) == 0) { 497 if (memcmp(sup->escape, "%/@", 3) == 0) 498 joliet_level = 1; 499 if (memcmp(sup->escape, "%/C", 3) == 0) 500 joliet_level = 2; 501 if (memcmp(sup->escape, "%/E", 3) == 0) 502 joliet_level = 3; 503 } 504 if (joliet_level != 0) { 505 if (iso_makemp(isomp, supbp, NULL) == -1) { 506 error = EINVAL; 507 goto out; 508 } 509 isomp->im_joliet_level = joliet_level; 510 } 511 } 512 513 if (supbp != NULL) { 514 brelse(supbp, 0); 515 supbp = NULL; 516 } 517 518 spec_node_setmountedfs(devvp, mp); 519 520 return 0; 521 out: 522 if (bp) 523 brelse(bp, 0); 524 if (pribp) 525 brelse(pribp, 0); 526 if (supbp) 527 brelse(supbp, 0); 528 if (isomp) { 529 free(isomp, M_ISOFSMNT); 530 mp->mnt_data = NULL; 531 } 532 return error; 533 } 534 535 /* 536 * Make a filesystem operational. 537 * Nothing to do at the moment. 538 */ 539 /* ARGSUSED */ 540 int 541 cd9660_start(struct mount *mp, int flags) 542 { 543 return 0; 544 } 545 546 /* 547 * unmount system call 548 */ 549 int 550 cd9660_unmount(struct mount *mp, int mntflags) 551 { 552 struct iso_mnt *isomp; 553 int error, flags = 0; 554 555 if (mntflags & MNT_FORCE) 556 flags |= FORCECLOSE; 557 if ((error = vflush(mp, NULLVP, flags)) != 0) 558 return (error); 559 560 isomp = VFSTOISOFS(mp); 561 562 if (isomp->im_devvp->v_type != VBAD) 563 spec_node_setmountedfs(isomp->im_devvp, NULL); 564 565 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 566 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED); 567 vput(isomp->im_devvp); 568 free(isomp, M_ISOFSMNT); 569 mp->mnt_data = NULL; 570 mp->mnt_flag &= ~MNT_LOCAL; 571 return (error); 572 } 573 574 /* 575 * Return root of a filesystem 576 */ 577 int 578 cd9660_root(struct mount *mp, struct vnode **vpp) 579 { 580 struct iso_mnt *imp = VFSTOISOFS(mp); 581 struct iso_directory_record *dp = 582 (struct iso_directory_record *)imp->root; 583 ino_t ino = isodirino(dp, imp); 584 585 /* 586 * With RRIP we must use the `.' entry of the root directory. 587 * Simply tell vget, that it's a relocated directory. 588 */ 589 return (cd9660_vget_internal(mp, ino, vpp, 590 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 591 } 592 593 /* 594 * Get file system statistics. 595 */ 596 int 597 cd9660_statvfs(struct mount *mp, struct statvfs *sbp) 598 { 599 struct iso_mnt *isomp; 600 601 isomp = VFSTOISOFS(mp); 602 603 sbp->f_bsize = isomp->logical_block_size; 604 sbp->f_frsize = sbp->f_bsize; 605 sbp->f_iosize = sbp->f_bsize; /* XXX */ 606 sbp->f_blocks = isomp->volume_space_size; 607 sbp->f_bfree = 0; /* total free blocks */ 608 sbp->f_bavail = 0; /* blocks free for non superuser */ 609 sbp->f_bresvd = 0; /* total reserved blocks */ 610 sbp->f_files = 0; /* total files */ 611 sbp->f_ffree = 0; /* free file nodes */ 612 sbp->f_favail = 0; /* free file nodes for non superuser */ 613 sbp->f_fresvd = 0; /* reserved file nodes */ 614 copy_statvfs_info(sbp, mp); 615 /* Use the first spare for flags: */ 616 sbp->f_spare[0] = isomp->im_flags; 617 return 0; 618 } 619 620 /* ARGSUSED */ 621 int 622 cd9660_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 623 { 624 return 0; 625 } 626 627 /* 628 * File handle to vnode 629 * 630 * Have to be really careful about stale file handles: 631 * - check that the inode number is in range 632 * - call iget() to get the locked inode 633 * - check for an unallocated inode (i_mode == 0) 634 * - check that the generation number matches 635 */ 636 637 struct ifid { 638 ushort ifid_len; 639 ushort ifid_pad; 640 int ifid_ino; 641 long ifid_start; 642 }; 643 644 /* ARGSUSED */ 645 int 646 cd9660_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 647 { 648 struct ifid ifh; 649 struct iso_node *ip; 650 struct vnode *nvp; 651 int error; 652 653 if (fhp->fid_len != sizeof(ifh)) 654 return EINVAL; 655 656 memcpy(&ifh, fhp, sizeof(ifh)); 657 #ifdef ISOFS_DBG 658 printf("fhtovp: ino %d, start %ld\n", 659 ifh.ifid_ino, ifh.ifid_start); 660 #endif 661 662 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 663 *vpp = NULLVP; 664 return (error); 665 } 666 ip = VTOI(nvp); 667 if (ip->inode.iso_mode == 0) { 668 vput(nvp); 669 *vpp = NULLVP; 670 return (ESTALE); 671 } 672 *vpp = nvp; 673 return (0); 674 } 675 676 int 677 cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 678 { 679 680 /* 681 * XXXX 682 * It would be nice if we didn't always set the `relocated' flag 683 * and force the extra read, but I don't want to think about fixing 684 * that right now. 685 */ 686 return (cd9660_vget_internal(mp, ino, vpp, 687 #if 0 688 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 689 #else 690 0, 691 #endif 692 NULL)); 693 } 694 695 int 696 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp, 697 int relocated, struct iso_directory_record *isodir) 698 { 699 struct iso_mnt *imp; 700 struct iso_node *ip; 701 struct buf *bp; 702 struct vnode *vp; 703 dev_t dev; 704 int error; 705 706 imp = VFSTOISOFS(mp); 707 dev = imp->im_dev; 708 709 retry: 710 if ((*vpp = cd9660_ihashget(dev, ino, LK_EXCLUSIVE)) != NULLVP) 711 return (0); 712 713 /* Allocate a new vnode/iso_node. */ 714 error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, NULL, &vp); 715 if (error) { 716 *vpp = NULLVP; 717 return (error); 718 } 719 ip = pool_get(&cd9660_node_pool, PR_WAITOK); 720 721 /* 722 * If someone beat us to it, put back the freshly allocated 723 * vnode/inode pair and retry. 724 */ 725 mutex_enter(&cd9660_hashlock); 726 if (cd9660_ihashget(dev, ino, 0) != NULL) { 727 mutex_exit(&cd9660_hashlock); 728 ungetnewvnode(vp); 729 pool_put(&cd9660_node_pool, ip); 730 goto retry; 731 } 732 733 memset(ip, 0, sizeof(struct iso_node)); 734 vp->v_data = ip; 735 ip->i_vnode = vp; 736 ip->i_dev = dev; 737 ip->i_number = ino; 738 ip->i_mnt = imp; 739 ip->i_devvp = imp->im_devvp; 740 genfs_node_init(vp, &cd9660_genfsops); 741 742 /* 743 * Put it onto its hash chain and lock it so that other requests for 744 * this inode will block if they arrive while we are sleeping waiting 745 * for old data structures to be purged or for the contents of the 746 * disk portion of this inode to be read. 747 */ 748 cd9660_ihashins(ip); 749 mutex_exit(&cd9660_hashlock); 750 751 if (isodir == 0) { 752 int lbn, off; 753 754 lbn = cd9660_lblkno(imp, ino); 755 if (lbn >= imp->volume_space_size) { 756 vput(vp); 757 printf("fhtovp: lbn exceed volume space %d\n", lbn); 758 return (ESTALE); 759 } 760 761 off = cd9660_blkoff(imp, ino); 762 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 763 vput(vp); 764 printf("fhtovp: crosses block boundary %d\n", 765 off + ISO_DIRECTORY_RECORD_SIZE); 766 return (ESTALE); 767 } 768 769 error = bread(imp->im_devvp, 770 lbn << (imp->im_bshift - DEV_BSHIFT), 771 imp->logical_block_size, NOCRED, 0, &bp); 772 if (error) { 773 vput(vp); 774 printf("fhtovp: bread error %d\n",error); 775 return (error); 776 } 777 isodir = (struct iso_directory_record *)((char *)bp->b_data + off); 778 779 if (off + isonum_711(isodir->length) > 780 imp->logical_block_size) { 781 vput(vp); 782 if (bp != 0) 783 brelse(bp, 0); 784 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 785 off +isonum_711(isodir->length), off, 786 isonum_711(isodir->length)); 787 return (ESTALE); 788 } 789 790 #if 0 791 if (isonum_733(isodir->extent) + 792 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 793 if (bp != 0) 794 brelse(bp, 0); 795 printf("fhtovp: file start miss %d vs %d\n", 796 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 797 ifhp->ifid_start); 798 return (ESTALE); 799 } 800 #endif 801 } else 802 bp = 0; 803 804 vref(ip->i_devvp); 805 806 if (relocated) { 807 /* 808 * On relocated directories we must 809 * read the `.' entry out of a dir. 810 */ 811 ip->iso_start = ino >> imp->im_bshift; 812 if (bp != 0) 813 brelse(bp, 0); 814 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 815 vput(vp); 816 return (error); 817 } 818 isodir = (struct iso_directory_record *)bp->b_data; 819 } 820 821 ip->iso_extent = isonum_733(isodir->extent); 822 ip->i_size = isonum_733(isodir->size); 823 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 824 825 /* 826 * Setup time stamp, attribute 827 */ 828 vp->v_type = VNON; 829 switch (imp->iso_ftype) { 830 default: /* ISO_FTYPE_9660 */ 831 { 832 struct buf *bp2; 833 int off; 834 if ((imp->im_flags & ISOFSMNT_EXTATT) 835 && (off = isonum_711(isodir->ext_attr_length))) 836 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), 837 NULL, &bp2); 838 else 839 bp2 = NULL; 840 cd9660_defattr(isodir, ip, bp2); 841 cd9660_deftstamp(isodir, ip, bp2); 842 if (bp2) 843 brelse(bp2, 0); 844 break; 845 } 846 case ISO_FTYPE_RRIP: 847 cd9660_rrip_analyze(isodir, ip, imp); 848 break; 849 } 850 851 if (bp != 0) 852 brelse(bp, 0); 853 854 /* 855 * Initialize the associated vnode 856 */ 857 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 858 case VFIFO: 859 vp->v_op = cd9660_fifoop_p; 860 break; 861 case VCHR: 862 case VBLK: 863 /* 864 * if device, look at device number table for translation 865 */ 866 vp->v_op = cd9660_specop_p; 867 spec_node_init(vp, ip->inode.iso_rdev); 868 break; 869 case VLNK: 870 case VNON: 871 case VSOCK: 872 case VDIR: 873 case VBAD: 874 break; 875 case VREG: 876 uvm_vnp_setsize(vp, ip->i_size); 877 break; 878 } 879 880 if (vp->v_type != VREG) 881 uvm_vnp_setsize(vp, 0); 882 883 if (ip->iso_extent == imp->root_extent) 884 vp->v_vflag |= VV_ROOT; 885 886 /* 887 * XXX need generation number? 888 */ 889 890 *vpp = vp; 891 return (0); 892 } 893 894 /* 895 * Vnode pointer to File handle 896 */ 897 /* ARGSUSED */ 898 int 899 cd9660_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 900 { 901 struct iso_node *ip = VTOI(vp); 902 struct ifid ifh; 903 904 if (*fh_size < sizeof(struct ifid)) { 905 *fh_size = sizeof(struct ifid); 906 return E2BIG; 907 } 908 *fh_size = sizeof(struct ifid); 909 910 memset(&ifh, 0, sizeof(ifh)); 911 ifh.ifid_len = sizeof(struct ifid); 912 ifh.ifid_ino = ip->i_number; 913 ifh.ifid_start = ip->iso_start; 914 memcpy(fhp, &ifh, sizeof(ifh)); 915 916 #ifdef ISOFS_DBG 917 printf("vptofh: ino %d, start %ld\n", 918 ifh.ifid_ino,ifh.ifid_start); 919 #endif 920 return 0; 921 } 922
Indexes created Mon Sep 29 21:09:56 GMT 2025