cd9660_vfsops.c revision 1.86
1 /* $NetBSD: cd9660_vfsops.c,v 1.86 2014/06/14 07:39:28 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 1.86 2014/06/14 07:39:28 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 (args == NULL) 220 return EINVAL; 221 if (*data_len < sizeof *args) 222 return EINVAL; 223 224 if (mp->mnt_flag & MNT_GETARGS) { 225 if (imp == NULL) 226 return EIO; 227 args->fspec = NULL; 228 args->flags = imp->im_flags; 229 *data_len = sizeof (*args); 230 return 0; 231 } 232 233 if ((mp->mnt_flag & MNT_RDONLY) == 0) 234 return (EROFS); 235 236 if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) 237 return EINVAL; 238 239 /* 240 * Not an update, or updating the name: look up the name 241 * and verify that it refers to a sensible block device. 242 */ 243 error = namei_simple_user(args->fspec, 244 NSM_FOLLOW_NOEMULROOT, &devvp); 245 if (error != 0) 246 return (error); 247 248 if (devvp->v_type != VBLK) { 249 vrele(devvp); 250 return ENOTBLK; 251 } 252 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 253 vrele(devvp); 254 return ENXIO; 255 } 256 /* 257 * If mount by non-root, then verify that user has necessary 258 * permissions on the device. 259 */ 260 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 261 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 262 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD)); 263 if (error) { 264 goto fail; 265 } 266 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 267 error = VOP_OPEN(devvp, FREAD, FSCRED); 268 if (error) 269 goto fail; 270 VOP_UNLOCK(devvp); 271 error = iso_mountfs(devvp, mp, l, args); 272 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 273 if (error) { 274 (void)VOP_CLOSE(devvp, FREAD, NOCRED); 275 goto fail; 276 } 277 VOP_UNLOCK(devvp); 278 /* reference to devvp is donated through iso_mountfs */ 279 } else { 280 if (devvp != imp->im_devvp && 281 devvp->v_rdev != imp->im_devvp->v_rdev) { 282 error = EINVAL; /* needs translation */ 283 goto fail; 284 } 285 VOP_UNLOCK(devvp); 286 vrele(devvp); 287 } 288 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 289 mp->mnt_op->vfs_name, mp, l); 290 291 fail: 292 VOP_UNLOCK(devvp); 293 vrele(devvp); 294 return (error); 295 } 296 297 /* 298 * Make a mount point from a volume descriptor 299 */ 300 static int 301 iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len) 302 { 303 struct iso_primary_descriptor *pri; 304 int logical_block_size; 305 struct iso_directory_record *rootp; 306 307 pri = (struct iso_primary_descriptor *)bp->b_data; 308 309 logical_block_size = isonum_723 (pri->logical_block_size); 310 311 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 312 || (logical_block_size & (logical_block_size - 1)) != 0) 313 return -1; 314 315 rootp = (struct iso_directory_record *)pri->root_directory_record; 316 317 isomp->logical_block_size = logical_block_size; 318 isomp->volume_space_size = isonum_733 (pri->volume_space_size); 319 memcpy(isomp->root, rootp, sizeof(isomp->root)); 320 isomp->root_extent = isonum_733 (rootp->extent); 321 isomp->root_size = isonum_733 (rootp->size); 322 isomp->im_joliet_level = 0; 323 324 isomp->im_bmask = logical_block_size - 1; 325 isomp->im_bshift = 0; 326 while ((1 << isomp->im_bshift) < isomp->logical_block_size) 327 isomp->im_bshift++; 328 329 if (ea_len != NULL) 330 *ea_len = isonum_711(rootp->ext_attr_length); 331 332 return 0; 333 } 334 335 /* 336 * Common code for mount and mountroot 337 */ 338 static int 339 iso_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, 340 struct iso_args *argp) 341 { 342 struct iso_mnt *isomp = (struct iso_mnt *)0; 343 struct buf *bp = NULL, *pribp = NULL, *supbp = NULL; 344 dev_t dev = devvp->v_rdev; 345 int error = EINVAL; 346 int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 347 int iso_bsize; 348 int iso_blknum; 349 int joliet_level; 350 struct iso_volume_descriptor *vdp; 351 struct iso_supplementary_descriptor *sup; 352 int sess = 0; 353 int ext_attr_length; 354 struct disklabel label; 355 356 if (!ronly) 357 return EROFS; 358 359 /* Flush out any old buffers remaining from a previous use. */ 360 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 361 return (error); 362 363 /* This is the "logical sector size". The standard says this 364 * should be 2048 or the physical sector size on the device, 365 * whichever is greater. For now, we'll just use a constant. 366 */ 367 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 368 369 error = VOP_IOCTL(devvp, DIOCGDINFO, &label, FREAD, FSCRED); 370 if (!error) { 371 /* XXX more sanity checks? */ 372 sess = label.d_partitions[DISKPART(dev)].p_cdsession; 373 } else { 374 /* fallback to old method */ 375 error = VOP_IOCTL(devvp, CDIOREADMSADDR, &sess, 0, FSCRED); 376 if (error) 377 sess = 0; /* never mind */ 378 } 379 #ifdef ISO_DEBUG 380 printf("isofs: session offset (part %"PRId32") %d\n", DISKPART(dev), sess); 381 #endif 382 383 for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) { 384 if ((error = bread(devvp, (iso_blknum+sess) * btodb(iso_bsize), 385 iso_bsize, NOCRED, 0, &bp)) != 0) 386 goto out; 387 388 vdp = (struct iso_volume_descriptor *)bp->b_data; 389 if (memcmp(vdp->id, ISO_STANDARD_ID, sizeof(vdp->id)) != 0) { 390 error = EINVAL; 391 goto out; 392 } 393 394 switch (isonum_711(vdp->type)) { 395 case ISO_VD_PRIMARY: 396 if (pribp == NULL) { 397 pribp = bp; 398 bp = NULL; 399 } 400 break; 401 402 case ISO_VD_SUPPLEMENTARY: 403 if (supbp == NULL) { 404 supbp = bp; 405 bp = NULL; 406 } 407 break; 408 409 default: 410 break; 411 } 412 413 if (isonum_711 (vdp->type) == ISO_VD_END) { 414 brelse(bp, 0); 415 bp = NULL; 416 break; 417 } 418 419 if (bp != NULL) { 420 brelse(bp, 0); 421 bp = NULL; 422 } 423 } 424 425 if (pribp == NULL) { 426 error = EINVAL; 427 goto out; 428 } 429 430 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK); 431 memset(isomp, 0, sizeof *isomp); 432 if (iso_makemp(isomp, pribp, &ext_attr_length) == -1) { 433 error = EINVAL; 434 goto out; 435 } 436 437 isomp->volume_space_size += sess; 438 439 brelse(pribp, BC_AGE); 440 pribp = NULL; 441 442 mp->mnt_data = isomp; 443 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 444 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CD9660); 445 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 446 mp->mnt_stat.f_namemax = ISO_MAXNAMLEN; 447 mp->mnt_flag |= MNT_LOCAL; 448 mp->mnt_iflag |= IMNT_MPSAFE; 449 mp->mnt_dev_bshift = iso_bsize; 450 mp->mnt_fs_bshift = isomp->im_bshift; 451 isomp->im_mountp = mp; 452 isomp->im_dev = dev; 453 isomp->im_devvp = devvp; 454 455 /* Check the Rock Ridge Extension support */ 456 if (!(argp->flags & ISOFSMNT_NORRIP)) { 457 struct iso_directory_record *rootp; 458 459 if ((error = bread(isomp->im_devvp, 460 (isomp->root_extent + ext_attr_length) << 461 (isomp->im_bshift - DEV_BSHIFT), 462 isomp->logical_block_size, NOCRED, 463 0, &bp)) != 0) 464 goto out; 465 466 rootp = (struct iso_directory_record *)bp->b_data; 467 468 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 469 argp->flags |= ISOFSMNT_NORRIP; 470 } else { 471 argp->flags &= ~ISOFSMNT_GENS; 472 } 473 474 /* 475 * The contents are valid, 476 * but they will get reread as part of another vnode, so... 477 */ 478 brelse(bp, BC_AGE); 479 bp = NULL; 480 } 481 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 482 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | ISOFSMNT_RRCASEINS); 483 484 if (isomp->im_flags & ISOFSMNT_GENS) 485 isomp->iso_ftype = ISO_FTYPE_9660; 486 else if (isomp->im_flags & ISOFSMNT_NORRIP) { 487 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 488 if (argp->flags & ISOFSMNT_NOCASETRANS) 489 isomp->im_flags |= ISOFSMNT_NOCASETRANS; 490 } else 491 isomp->iso_ftype = ISO_FTYPE_RRIP; 492 493 /* Check the Joliet Extension support */ 494 if ((argp->flags & ISOFSMNT_NORRIP) != 0 && 495 (argp->flags & ISOFSMNT_NOJOLIET) == 0 && 496 supbp != NULL) { 497 joliet_level = 0; 498 sup = (struct iso_supplementary_descriptor *)supbp->b_data; 499 500 if ((isonum_711(sup->flags) & 1) == 0) { 501 if (memcmp(sup->escape, "%/@", 3) == 0) 502 joliet_level = 1; 503 if (memcmp(sup->escape, "%/C", 3) == 0) 504 joliet_level = 2; 505 if (memcmp(sup->escape, "%/E", 3) == 0) 506 joliet_level = 3; 507 } 508 if (joliet_level != 0) { 509 if (iso_makemp(isomp, supbp, NULL) == -1) { 510 error = EINVAL; 511 goto out; 512 } 513 isomp->im_joliet_level = joliet_level; 514 } 515 } 516 517 if (supbp != NULL) { 518 brelse(supbp, 0); 519 supbp = NULL; 520 } 521 522 spec_node_setmountedfs(devvp, mp); 523 524 return 0; 525 out: 526 if (bp) 527 brelse(bp, 0); 528 if (pribp) 529 brelse(pribp, 0); 530 if (supbp) 531 brelse(supbp, 0); 532 if (isomp) { 533 free(isomp, M_ISOFSMNT); 534 mp->mnt_data = NULL; 535 } 536 return error; 537 } 538 539 /* 540 * Make a filesystem operational. 541 * Nothing to do at the moment. 542 */ 543 /* ARGSUSED */ 544 int 545 cd9660_start(struct mount *mp, int flags) 546 { 547 return 0; 548 } 549 550 /* 551 * unmount system call 552 */ 553 int 554 cd9660_unmount(struct mount *mp, int mntflags) 555 { 556 struct iso_mnt *isomp; 557 int error, flags = 0; 558 559 if (mntflags & MNT_FORCE) 560 flags |= FORCECLOSE; 561 if ((error = vflush(mp, NULLVP, flags)) != 0) 562 return (error); 563 564 isomp = VFSTOISOFS(mp); 565 566 if (isomp->im_devvp->v_type != VBAD) 567 spec_node_setmountedfs(isomp->im_devvp, NULL); 568 569 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 570 error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED); 571 vput(isomp->im_devvp); 572 free(isomp, M_ISOFSMNT); 573 mp->mnt_data = NULL; 574 mp->mnt_flag &= ~MNT_LOCAL; 575 return (error); 576 } 577 578 /* 579 * Return root of a filesystem 580 */ 581 int 582 cd9660_root(struct mount *mp, struct vnode **vpp) 583 { 584 struct iso_mnt *imp = VFSTOISOFS(mp); 585 struct iso_directory_record *dp = 586 (struct iso_directory_record *)imp->root; 587 ino_t ino = isodirino(dp, imp); 588 589 return cd9660_vget(mp, ino, vpp); 590 } 591 592 /* 593 * Get file system statistics. 594 */ 595 int 596 cd9660_statvfs(struct mount *mp, struct statvfs *sbp) 597 { 598 struct iso_mnt *isomp; 599 600 isomp = VFSTOISOFS(mp); 601 602 sbp->f_bsize = isomp->logical_block_size; 603 sbp->f_frsize = sbp->f_bsize; 604 sbp->f_iosize = sbp->f_bsize; /* XXX */ 605 sbp->f_blocks = isomp->volume_space_size; 606 sbp->f_bfree = 0; /* total free blocks */ 607 sbp->f_bavail = 0; /* blocks free for non superuser */ 608 sbp->f_bresvd = 0; /* total reserved blocks */ 609 sbp->f_files = 0; /* total files */ 610 sbp->f_ffree = 0; /* free file nodes */ 611 sbp->f_favail = 0; /* free file nodes for non superuser */ 612 sbp->f_fresvd = 0; /* reserved file nodes */ 613 copy_statvfs_info(sbp, mp); 614 /* Use the first spare for flags: */ 615 sbp->f_spare[0] = isomp->im_flags; 616 return 0; 617 } 618 619 /* ARGSUSED */ 620 int 621 cd9660_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 622 { 623 return 0; 624 } 625 626 /* 627 * File handle to vnode 628 * 629 * Have to be really careful about stale file handles: 630 * - check that the inode number is in range 631 * - call iget() to get the locked inode 632 * - check for an unallocated inode (i_mode == 0) 633 * - check that the generation number matches 634 */ 635 636 struct ifid { 637 ushort ifid_len; 638 ushort ifid_pad; 639 ino_t ifid_ino; 640 #ifdef ISOFS_DBG 641 u_long ifid_start; 642 #endif 643 }; 644 645 /* ARGSUSED */ 646 int 647 cd9660_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 648 { 649 struct ifid ifh; 650 struct iso_node *ip; 651 struct vnode *nvp; 652 int error; 653 654 if (fhp->fid_len != sizeof(ifh)) 655 return EINVAL; 656 657 memcpy(&ifh, fhp, sizeof(ifh)); 658 #ifdef ISOFS_DBG 659 printf("fhtovp: ino %"PRIu64", start %lu\n", 660 ifh.ifid_ino, ifh.ifid_start); 661 #endif 662 663 if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { 664 *vpp = NULLVP; 665 return (error); 666 } 667 ip = VTOI(nvp); 668 if (ip->inode.iso_mode == 0) { 669 vput(nvp); 670 *vpp = NULLVP; 671 return (ESTALE); 672 } 673 *vpp = nvp; 674 return (0); 675 } 676 677 int 678 cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 679 { 680 681 return cd9660_vget_internal(mp, ino, vpp); 682 } 683 684 int 685 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp) 686 { 687 struct iso_mnt *imp; 688 struct iso_node *ip; 689 struct iso_directory_record *isodir; 690 struct buf *bp; 691 struct vnode *vp; 692 dev_t dev; 693 int lbn, off; 694 int error; 695 696 imp = VFSTOISOFS(mp); 697 dev = imp->im_dev; 698 699 retry: 700 if ((*vpp = cd9660_ihashget(dev, ino, LK_EXCLUSIVE)) != NULLVP) 701 return (0); 702 703 /* Allocate a new vnode/iso_node. */ 704 error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, NULL, &vp); 705 if (error) { 706 *vpp = NULLVP; 707 return (error); 708 } 709 ip = pool_get(&cd9660_node_pool, PR_WAITOK); 710 711 /* 712 * If someone beat us to it, put back the freshly allocated 713 * vnode/inode pair and retry. 714 */ 715 mutex_enter(&cd9660_hashlock); 716 if (cd9660_ihashget(dev, ino, 0) != NULL) { 717 mutex_exit(&cd9660_hashlock); 718 ungetnewvnode(vp); 719 pool_put(&cd9660_node_pool, ip); 720 goto retry; 721 } 722 723 memset(ip, 0, sizeof(struct iso_node)); 724 vp->v_data = ip; 725 ip->i_vnode = vp; 726 ip->i_dev = dev; 727 ip->i_number = ino; 728 ip->i_mnt = imp; 729 ip->i_devvp = imp->im_devvp; 730 genfs_node_init(vp, &cd9660_genfsops); 731 732 /* 733 * Put it onto its hash chain and lock it so that other requests for 734 * this inode will block if they arrive while we are sleeping waiting 735 * for old data structures to be purged or for the contents of the 736 * disk portion of this inode to be read. 737 */ 738 cd9660_ihashins(ip); 739 mutex_exit(&cd9660_hashlock); 740 741 lbn = cd9660_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 = cd9660_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, 0, &bp); 759 if (error) { 760 vput(vp); 761 printf("fhtovp: bread error %d\n",error); 762 return (error); 763 } 764 isodir = (struct iso_directory_record *)((char *)bp->b_data + off); 765 766 if (off + isonum_711(isodir->length) > imp->logical_block_size) { 767 vput(vp); 768 if (bp != 0) 769 brelse(bp, 0); 770 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 771 off +isonum_711(isodir->length), off, 772 isonum_711(isodir->length)); 773 return (ESTALE); 774 } 775 776 #if 0 777 if (isonum_733(isodir->extent) + 778 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 779 if (bp != 0) 780 brelse(bp, 0); 781 printf("fhtovp: file start miss %d vs %d\n", 782 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 783 ifhp->ifid_start); 784 return (ESTALE); 785 } 786 #endif 787 788 ip->iso_extent = isonum_733(isodir->extent); 789 ip->i_size = isonum_733(isodir->size); 790 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 791 792 /* 793 * Setup time stamp, attribute 794 */ 795 vp->v_type = VNON; 796 switch (imp->iso_ftype) { 797 default: /* ISO_FTYPE_9660 */ 798 { 799 struct buf *bp2; 800 if ((imp->im_flags & ISOFSMNT_EXTATT) 801 && (off = isonum_711(isodir->ext_attr_length))) 802 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), 803 NULL, &bp2); 804 else 805 bp2 = NULL; 806 cd9660_defattr(isodir, ip, bp2); 807 cd9660_deftstamp(isodir, ip, bp2); 808 if (bp2) 809 brelse(bp2, 0); 810 break; 811 } 812 case ISO_FTYPE_RRIP: 813 cd9660_rrip_analyze(isodir, ip, imp); 814 break; 815 } 816 817 if (bp != 0) 818 brelse(bp, 0); 819 820 /* 821 * Initialize the associated vnode 822 */ 823 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 824 case VFIFO: 825 vp->v_op = cd9660_fifoop_p; 826 break; 827 case VCHR: 828 case VBLK: 829 /* 830 * if device, look at device number table for translation 831 */ 832 vp->v_op = cd9660_specop_p; 833 spec_node_init(vp, ip->inode.iso_rdev); 834 break; 835 case VLNK: 836 case VNON: 837 case VSOCK: 838 case VDIR: 839 case VBAD: 840 break; 841 case VREG: 842 uvm_vnp_setsize(vp, ip->i_size); 843 break; 844 } 845 846 if (vp->v_type != VREG) 847 uvm_vnp_setsize(vp, 0); 848 849 if (ip->iso_extent == imp->root_extent) 850 vp->v_vflag |= VV_ROOT; 851 852 /* 853 * XXX need generation number? 854 */ 855 856 *vpp = vp; 857 return (0); 858 } 859 860 /* 861 * Vnode pointer to File handle 862 */ 863 /* ARGSUSED */ 864 int 865 cd9660_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 866 { 867 struct iso_node *ip = VTOI(vp); 868 struct ifid ifh; 869 870 if (*fh_size < sizeof(struct ifid)) { 871 *fh_size = sizeof(struct ifid); 872 return E2BIG; 873 } 874 *fh_size = sizeof(struct ifid); 875 876 memset(&ifh, 0, sizeof(ifh)); 877 ifh.ifid_len = sizeof(struct ifid); 878 ifh.ifid_ino = ip->i_number; 879 #ifdef ISOFS_DBG 880 ifh.ifid_start = ip->iso_start; 881 #endif 882 memcpy(fhp, &ifh, sizeof(ifh)); 883 884 #ifdef ISOFS_DBG 885 printf("vptofh: ino %"PRIu64", start %lu\n", 886 ifh.ifid_ino,ifh.ifid_start); 887 #endif 888 return 0; 889 } 890
Indexes created Thu Sep 25 16:09:42 GMT 2025