1 /*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley 6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 7 * Support code is derived from software contributed to Berkeley 8 * by Atsushi Murai (amurai@spec.co.jp). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95 39 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/priv.h> 46 #include <sys/nlookup.h> 47 #include <sys/kernel.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <sys/buf.h> 51 #include <sys/cdio.h> 52 #include <sys/conf.h> 53 #include <sys/fcntl.h> 54 #include <sys/malloc.h> 55 #include <sys/stat.h> 56 #include <sys/syslog.h> 57 #include <sys/iconv.h> 58 59 #include <vm/vm_zone.h> 60 61 #include <sys/buf2.h> 62 63 #include "iso.h" 64 #include "iso_rrip.h" 65 #include "cd9660_node.h" 66 #include "cd9660_mount.h" 67 68 extern struct vop_ops cd9660_vnode_vops; 69 extern struct vop_ops cd9660_spec_vops; 70 extern struct vop_ops cd9660_fifo_vops; 71 72 MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure"); 73 MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part"); 74 75 struct iconv_functions *cd9660_iconv = NULL; 76 77 static int cd9660_mount (struct mount *, char *, caddr_t, struct ucred *); 78 static int cd9660_unmount (struct mount *, int); 79 static int cd9660_root (struct mount *, struct vnode **); 80 static int cd9660_statfs (struct mount *, struct statfs *, struct ucred *); 81 static int cd9660_vget (struct mount *, struct vnode *, ino_t, struct vnode **); 82 static int cd9660_fhtovp (struct mount *, struct vnode *rootvp, 83 struct fid *, struct vnode **); 84 static int cd9660_checkexp (struct mount *, struct sockaddr *, 85 int *, struct ucred **); 86 static int cd9660_vptofh (struct vnode *, struct fid *); 87 88 static struct vfsops cd9660_vfsops = { 89 .vfs_mount = cd9660_mount, 90 .vfs_unmount = cd9660_unmount, 91 .vfs_root = cd9660_root, 92 .vfs_statfs = cd9660_statfs, 93 .vfs_sync = vfs_stdsync, 94 .vfs_vget = cd9660_vget, 95 .vfs_fhtovp = cd9660_fhtovp, 96 .vfs_checkexp = cd9660_checkexp, 97 .vfs_vptofh = cd9660_vptofh, 98 .vfs_init = cd9660_init, 99 .vfs_uninit = cd9660_uninit, 100 }; 101 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY); 102 MODULE_VERSION(cd9660, 1); 103 104 105 /* 106 * Called by vfs_mountroot when iso is going to be mounted as root. 107 */ 108 109 static int iso_get_ssector (cdev_t dev); 110 static int iso_mountfs (struct vnode *devvp, struct mount *mp, 111 struct iso_args *argp); 112 113 /* 114 * Try to find the start of the last data track on this CD-ROM. This 115 * is used to mount the last session of a multi-session CD. Bail out 116 * and return 0 if we fail, this is always a safe bet. 117 */ 118 static int 119 iso_get_ssector(cdev_t dev) 120 { 121 struct ioc_toc_header h; 122 struct ioc_read_toc_single_entry t; 123 int i; 124 125 if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD, 126 proc0.p_ucred, NULL, NULL) != 0) 127 return 0; 128 129 for (i = h.ending_track; i >= 0; i--) { 130 t.address_format = CD_LBA_FORMAT; 131 t.track = i; 132 if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD, 133 proc0.p_ucred, NULL, NULL) != 0) { 134 return 0; 135 } 136 if ((t.entry.control & 4) != 0) 137 /* found a data track */ 138 break; 139 } 140 141 if (i < 0) 142 return 0; 143 144 return ntohl(t.entry.addr.lba); 145 } 146 147 static int 148 iso_mountroot(struct mount *mp) 149 { 150 struct iso_args args; 151 struct vnode *rootvp; 152 int error; 153 154 if ((error = bdevvp(rootdev, &rootvp))) { 155 kprintf("iso_mountroot: can't find rootvp\n"); 156 return (error); 157 } 158 args.flags = ISOFSMNT_ROOT; 159 160 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY); 161 error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL); 162 vn_unlock(rootvp); 163 if (error) 164 return (error); 165 166 args.ssector = iso_get_ssector(rootdev); 167 168 vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY); 169 VOP_CLOSE(rootvp, FREAD, NULL); 170 vn_unlock(rootvp); 171 172 if (bootverbose) 173 kprintf("iso_mountroot(): using session at block %d\n", 174 args.ssector); 175 if ((error = iso_mountfs(rootvp, mp, &args)) != 0) 176 return (error); 177 178 cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred); 179 return (0); 180 } 181 182 /* 183 * VFS Operations. 184 * 185 * mount system call 186 */ 187 static int 188 cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 189 { 190 struct vnode *devvp; 191 struct iso_args args; 192 size_t size; 193 int error; 194 mode_t accessmode; 195 struct iso_mnt *imp = NULL; 196 struct nlookupdata nd; 197 198 if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) { 199 return (iso_mountroot(mp)); 200 } 201 if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args)))) 202 return (error); 203 204 if ((mp->mnt_flag & MNT_RDONLY) == 0) 205 return (EROFS); 206 207 /* 208 * If updating, check whether changing from read-only to 209 * read/write; if there is no device name, that's all we do. 210 */ 211 if (mp->mnt_flag & MNT_UPDATE) { 212 imp = VFSTOISOFS(mp); 213 if (args.fspec == 0) 214 return (vfs_export(mp, &imp->im_export, &args.export)); 215 } 216 /* 217 * Not an update, or updating the name: look up the name 218 * and verify that it refers to a sensible block device. 219 */ 220 devvp = NULL; 221 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 222 if (error == 0) 223 error = nlookup(&nd); 224 if (error == 0) 225 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 226 nlookup_done(&nd); 227 if (error) 228 return (error); 229 230 if (!vn_isdisk(devvp, &error)) { 231 vrele(devvp); 232 return (error); 233 } 234 235 /* 236 * Verify that user has necessary permissions on the device, 237 * or has superuser abilities 238 */ 239 accessmode = VREAD; 240 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 241 error = VOP_EACCESS(devvp, accessmode, cred); 242 if (error) 243 error = priv_check_cred(cred, PRIV_ROOT, 0); 244 if (error) { 245 vput(devvp); 246 return (error); 247 } 248 vn_unlock(devvp); 249 250 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 251 error = iso_mountfs(devvp, mp, &args); 252 } else { 253 if (devvp != imp->im_devvp) 254 error = EINVAL; /* needs translation */ 255 else 256 vrele(devvp); 257 } 258 if (error) { 259 vrele(devvp); 260 return error; 261 } 262 imp = VFSTOISOFS(mp); 263 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 264 &size); 265 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 266 cd9660_statfs(mp, &mp->mnt_stat, cred); 267 return 0; 268 } 269 270 /* 271 * Common code for mount and mountroot 272 */ 273 static int 274 iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp) 275 { 276 struct iso_mnt *isomp = NULL; 277 struct buf *bp = NULL; 278 struct buf *pribp = NULL, *supbp = NULL; 279 cdev_t dev; 280 int error = EINVAL; 281 int needclose = 0; 282 int high_sierra = 0; 283 int iso_bsize; 284 int iso_blknum; 285 int joliet_level; 286 struct iso_volume_descriptor *vdp = NULL; 287 struct iso_primary_descriptor *pri = NULL; 288 struct iso_sierra_primary_descriptor *pri_sierra = NULL; 289 struct iso_supplementary_descriptor *sup = NULL; 290 struct iso_directory_record *rootp; 291 int logical_block_size; 292 char cs_local[ICONV_CSNMAXLEN]; 293 char cs_disk[ICONV_CSNMAXLEN]; 294 295 if (!(mp->mnt_flag & MNT_RDONLY)) 296 return EROFS; 297 298 /* 299 * Disallow multiple mounts of the same device. 300 * Disallow mounting of a device that is currently in use 301 * Flush out any old buffers remaining from a previous use. 302 */ 303 if ((error = vfs_mountedon(devvp))) 304 return error; 305 if (vcount(devvp) > 0) 306 return EBUSY; 307 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0))) 308 return (error); 309 310 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 311 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL); 312 vn_unlock(devvp); 313 if (error) 314 return error; 315 dev = devvp->v_rdev; 316 if (dev->si_iosize_max != 0) 317 mp->mnt_iosize_max = dev->si_iosize_max; 318 if (mp->mnt_iosize_max > MAXPHYS) 319 mp->mnt_iosize_max = MAXPHYS; 320 321 needclose = 1; 322 323 /* This is the "logical sector size". The standard says this 324 * should be 2048 or the physical sector size on the device, 325 * whichever is greater. For now, we'll just use a constant. 326 */ 327 iso_bsize = ISO_DEFAULT_BLOCK_SIZE; 328 329 joliet_level = 0; 330 for (iso_blknum = 16 + argp->ssector; 331 iso_blknum < 100 + argp->ssector; 332 iso_blknum++) { 333 if ((error = bread(devvp, (off_t)iso_blknum * iso_bsize, 334 iso_bsize, &bp)) != 0) 335 goto out; 336 337 vdp = (struct iso_volume_descriptor *)bp->b_data; 338 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 339 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID, 340 sizeof vdp->id) != 0) { 341 error = EINVAL; 342 goto out; 343 } else 344 high_sierra = 1; 345 } 346 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){ 347 case ISO_VD_PRIMARY: 348 if (pribp == NULL) { 349 pribp = bp; 350 bp = NULL; 351 pri = (struct iso_primary_descriptor *)vdp; 352 pri_sierra = 353 (struct iso_sierra_primary_descriptor *)vdp; 354 } 355 break; 356 357 case ISO_VD_SUPPLEMENTARY: 358 if (supbp == NULL) { 359 supbp = bp; 360 bp = NULL; 361 sup = (struct iso_supplementary_descriptor *)vdp; 362 363 if (!(argp->flags & ISOFSMNT_NOJOLIET)) { 364 if (bcmp(sup->escape, "%/@", 3) == 0) 365 joliet_level = 1; 366 if (bcmp(sup->escape, "%/C", 3) == 0) 367 joliet_level = 2; 368 if (bcmp(sup->escape, "%/E", 3) == 0) 369 joliet_level = 3; 370 371 if ((isonum_711 (sup->flags) & 1) && 372 (argp->flags & ISOFSMNT_BROKENJOLIET) == 0) 373 joliet_level = 0; 374 } 375 } 376 break; 377 378 case ISO_VD_END: 379 goto vd_end; 380 381 default: 382 break; 383 } 384 if (bp) { 385 brelse(bp); 386 bp = NULL; 387 } 388 } 389 vd_end: 390 if (bp) { 391 brelse(bp); 392 bp = NULL; 393 } 394 395 if (pri == NULL) { 396 error = EINVAL; 397 goto out; 398 } 399 400 logical_block_size = 401 isonum_723 (high_sierra? 402 pri_sierra->logical_block_size: 403 pri->logical_block_size); 404 405 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 406 || (logical_block_size & (logical_block_size - 1)) != 0) { 407 error = EINVAL; 408 goto out; 409 } 410 411 rootp = (struct iso_directory_record *) 412 (high_sierra? 413 pri_sierra->root_directory_record: 414 pri->root_directory_record); 415 416 isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 417 isomp->logical_block_size = logical_block_size; 418 isomp->volume_space_size = 419 isonum_733 (high_sierra? 420 pri_sierra->volume_space_size: 421 pri->volume_space_size); 422 isomp->joliet_level = 0; 423 /* 424 * Since an ISO9660 multi-session CD can also access previous 425 * sessions, we have to include them into the space consider- 426 * ations. This doesn't yield a very accurate number since 427 * parts of the old sessions might be inaccessible now, but we 428 * can't do much better. This is also important for the NFS 429 * filehandle validation. 430 */ 431 isomp->volume_space_size += argp->ssector; 432 bcopy (rootp, isomp->root, sizeof isomp->root); 433 isomp->root_extent = isonum_733 (rootp->extent); 434 isomp->root_size = isonum_733 (rootp->size); 435 436 isomp->im_bmask = logical_block_size - 1; 437 isomp->im_bshift = ffs(logical_block_size) - 1; 438 439 pribp->b_flags |= B_AGE; 440 brelse(pribp); 441 pribp = NULL; 442 443 mp->mnt_data = (qaddr_t)isomp; 444 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 445 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 446 mp->mnt_maxsymlinklen = 0; 447 mp->mnt_flag |= MNT_LOCAL; 448 isomp->im_mountp = mp; 449 isomp->im_dev = dev; 450 isomp->im_devvp = devvp; 451 452 dev->si_mountpoint = mp; 453 454 /* Check the Rock Ridge Extention support */ 455 if (!(argp->flags & ISOFSMNT_NORRIP)) { 456 if ((error = bread(isomp->im_devvp, 457 lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)), 458 isomp->logical_block_size, &bp)) != 0) 459 goto out; 460 461 rootp = (struct iso_directory_record *)bp->b_data; 462 463 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 464 argp->flags |= ISOFSMNT_NORRIP; 465 } else { 466 argp->flags &= ~ISOFSMNT_GENS; 467 } 468 469 /* 470 * The contents are valid, 471 * but they will get reread as part of another vnode, so... 472 */ 473 bp->b_flags |= B_AGE; 474 brelse(bp); 475 bp = NULL; 476 } 477 isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS | 478 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | 479 ISOFSMNT_KICONV); 480 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 481 bcopy(argp->cs_local, cs_local, sizeof(cs_local)); 482 bcopy(argp->cs_disk, cs_disk, sizeof(cs_disk)); 483 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 484 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 485 } else { 486 isomp->im_d2l = NULL; 487 isomp->im_l2d = NULL; 488 } 489 490 if (high_sierra) { 491 /* this effectively ignores all the mount flags */ 492 log(LOG_INFO, "cd9660: High Sierra Format\n"); 493 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 494 } else { 495 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 496 default: 497 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 498 break; 499 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 500 isomp->iso_ftype = ISO_FTYPE_9660; 501 break; 502 case 0: 503 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 504 isomp->iso_ftype = ISO_FTYPE_RRIP; 505 break; 506 } 507 } 508 509 /* Decide whether to use the Joliet descriptor */ 510 511 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 512 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", joliet_level); 513 rootp = (struct iso_directory_record *) 514 sup->root_directory_record; 515 bcopy (rootp, isomp->root, sizeof isomp->root); 516 isomp->root_extent = isonum_733 (rootp->extent); 517 isomp->root_size = isonum_733 (rootp->size); 518 isomp->joliet_level = joliet_level; 519 supbp->b_flags |= B_AGE; 520 } 521 522 if (supbp) { 523 brelse(supbp); 524 supbp = NULL; 525 } 526 527 vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops); 528 vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops); 529 vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops); 530 531 return 0; 532 out: 533 dev->si_mountpoint = NULL; 534 if (bp) 535 brelse(bp); 536 if (pribp) 537 brelse(pribp); 538 if (supbp) 539 brelse(supbp); 540 if (needclose) { 541 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 542 VOP_CLOSE(devvp, FREAD, NULL); 543 vn_unlock(devvp); 544 } 545 if (isomp) { 546 kfree((caddr_t)isomp, M_ISOFSMNT); 547 mp->mnt_data = (qaddr_t)0; 548 } 549 return error; 550 } 551 552 /* 553 * unmount system call 554 */ 555 static int 556 cd9660_unmount(struct mount *mp, int mntflags) 557 { 558 struct iso_mnt *isomp; 559 int error, flags = 0; 560 561 if (mntflags & MNT_FORCE) 562 flags |= FORCECLOSE; 563 #if 0 564 mntflushbuf(mp, 0); 565 if (mntinvalbuf(mp)) 566 return EBUSY; 567 #endif 568 if ((error = vflush(mp, 0, flags))) 569 return (error); 570 571 isomp = VFSTOISOFS(mp); 572 573 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 574 if (isomp->im_d2l) 575 cd9660_iconv->close(isomp->im_d2l); 576 if (isomp->im_l2d) 577 cd9660_iconv->close(isomp->im_l2d); 578 } 579 580 isomp->im_devvp->v_rdev->si_mountpoint = NULL; 581 vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY); 582 error = VOP_CLOSE(isomp->im_devvp, FREAD, NULL); 583 vn_unlock(isomp->im_devvp); 584 vrele(isomp->im_devvp); 585 kfree((caddr_t)isomp, M_ISOFSMNT); 586 mp->mnt_data = (qaddr_t)0; 587 mp->mnt_flag &= ~MNT_LOCAL; 588 return (error); 589 } 590 591 /* 592 * Return root of a filesystem 593 */ 594 static int 595 cd9660_root(struct mount *mp, struct vnode **vpp) 596 { 597 struct iso_mnt *imp = VFSTOISOFS(mp); 598 struct iso_directory_record *dp = 599 (struct iso_directory_record *)imp->root; 600 ino_t ino = isodirino(dp, imp); 601 602 /* 603 * With RRIP we must use the `.' entry of the root directory. 604 * Simply tell vget, that it's a relocated directory. 605 */ 606 return (cd9660_vget_internal(mp, ino, vpp, 607 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 608 } 609 610 /* 611 * Get file system statistics. 612 */ 613 int 614 cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 615 { 616 struct iso_mnt *isomp; 617 618 isomp = VFSTOISOFS(mp); 619 620 sbp->f_bsize = isomp->logical_block_size; 621 sbp->f_iosize = sbp->f_bsize; /* XXX */ 622 sbp->f_blocks = isomp->volume_space_size; 623 sbp->f_bfree = 0; /* total free blocks */ 624 sbp->f_bavail = 0; /* blocks free for non superuser */ 625 sbp->f_files = 0; /* total files */ 626 sbp->f_ffree = 0; /* free file nodes */ 627 if (sbp != &mp->mnt_stat) { 628 sbp->f_type = mp->mnt_vfc->vfc_typenum; 629 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 630 } 631 return 0; 632 } 633 634 /* 635 * File handle to vnode 636 * 637 * Have to be really careful about stale file handles: 638 * - check that the inode number is in range 639 * - call iget() to get the locked inode 640 * - check for an unallocated inode (i_mode == 0) 641 * - check that the generation number matches 642 */ 643 644 struct ifid { 645 ushort ifid_len; 646 ushort ifid_pad; 647 int ifid_ino; 648 long ifid_start; 649 }; 650 651 /* ARGSUSED */ 652 int 653 cd9660_fhtovp(struct mount *mp, struct vnode *rootvp, 654 struct fid *fhp, struct vnode **vpp) 655 { 656 struct ifid *ifhp = (struct ifid *)fhp; 657 struct iso_node *ip; 658 struct vnode *nvp; 659 int error; 660 661 #ifdef ISOFS_DBG 662 kprintf("fhtovp: ino %d, start %ld\n", 663 ifhp->ifid_ino, ifhp->ifid_start); 664 #endif 665 666 if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) { 667 *vpp = NULLVP; 668 return (error); 669 } 670 ip = VTOI(nvp); 671 if (ip->inode.iso_mode == 0) { 672 vput(nvp); 673 *vpp = NULLVP; 674 return (ESTALE); 675 } 676 *vpp = nvp; 677 return (0); 678 } 679 680 int 681 cd9660_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp, 682 struct ucred **credanonp) 683 { 684 struct netcred *np; 685 struct iso_mnt *imp; 686 687 imp = VFSTOISOFS(mp); 688 689 /* 690 * Get the export permission structure for this <mp, client> tuple. 691 */ 692 np = vfs_export_lookup(mp, &imp->im_export, nam); 693 if (np == NULL) 694 return (EACCES); 695 696 *exflagsp = np->netc_exflags; 697 *credanonp = &np->netc_anon; 698 return (0); 699 } 700 701 int 702 cd9660_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 703 { 704 705 /* 706 * XXXX 707 * It would be nice if we didn't always set the `relocated' flag 708 * and force the extra read, but I don't want to think about fixing 709 * that right now. 710 */ 711 return (cd9660_vget_internal(mp, ino, vpp, 712 #if 0 713 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 714 #else 715 0, 716 #endif 717 NULL)); 718 } 719 720 int 721 cd9660_vget_internal(struct mount *mp, ino_t ino, struct vnode **vpp, 722 int relocated, struct iso_directory_record *isodir) 723 { 724 struct iso_mnt *imp; 725 struct iso_node *ip; 726 struct buf *bp; 727 struct vnode *vp; 728 cdev_t dev; 729 int error; 730 731 imp = VFSTOISOFS(mp); 732 dev = imp->im_dev; 733 again: 734 if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP) 735 return (0); 736 737 /* Allocate a new vnode/iso_node. */ 738 error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0); 739 if (error) { 740 *vpp = NULLVP; 741 return (error); 742 } 743 ip = kmalloc(sizeof(struct iso_node), M_ISOFSNODE, M_WAITOK | M_ZERO); 744 ip->i_vnode = vp; 745 ip->i_dev = dev; 746 ip->i_number = ino; 747 748 /* 749 * Insert it into the inode hash table and check for a collision. 750 * If a collision occurs, throw away the vnode and try again. 751 */ 752 if (cd9660_ihashins(ip) != 0) { 753 kprintf("debug: cd9660 ihashins collision, retrying\n"); 754 vx_put(vp); 755 kfree(ip, M_ISOFSNODE); 756 goto again; 757 } 758 vp->v_data = ip; 759 760 if (isodir == NULL) { 761 int lbn, off; 762 763 lbn = lblkno(imp, ino); 764 if (lbn >= imp->volume_space_size) { 765 vx_put(vp); 766 kprintf("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 vx_put(vp); 773 kprintf("fhtovp: crosses block boundary %d\n", 774 off + ISO_DIRECTORY_RECORD_SIZE); 775 return (ESTALE); 776 } 777 778 error = bread(imp->im_devvp, 779 lblktooff(imp, lbn), 780 imp->logical_block_size, &bp); 781 if (error) { 782 vx_put(vp); 783 brelse(bp); 784 kprintf("fhtovp: bread error %d\n",error); 785 return (error); 786 } 787 isodir = (struct iso_directory_record *)(bp->b_data + off); 788 789 if (off + isonum_711(isodir->length) > 790 imp->logical_block_size) { 791 vx_put(vp); 792 if (bp != NULL) 793 brelse(bp); 794 kprintf("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 != NULL) 804 brelse(bp); 805 kprintf("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 = NULL; 813 814 ip->i_mnt = imp; 815 ip->i_devvp = imp->im_devvp; 816 vref(ip->i_devvp); 817 818 if (relocated) { 819 /* 820 * On relocated directories we must 821 * read the `.' entry out of a dir. 822 */ 823 ip->iso_start = ino >> imp->im_bshift; 824 if (bp != NULL) 825 brelse(bp); 826 if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 827 vx_put(vp); 828 return (error); 829 } 830 isodir = (struct iso_directory_record *)bp->b_data; 831 } 832 833 ip->iso_extent = isonum_733(isodir->extent); 834 ip->i_size = isonum_733(isodir->size); 835 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 836 837 /* 838 * Setup time stamp, attribute 839 */ 840 vp->v_type = VNON; 841 switch (imp->iso_ftype) { 842 default: /* ISO_FTYPE_9660 */ 843 { 844 struct buf *bp2; 845 int off; 846 if ((imp->im_flags & ISOFSMNT_EXTATT) 847 && (off = isonum_711(isodir->ext_attr_length))) 848 cd9660_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 849 &bp2); 850 else 851 bp2 = NULL; 852 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 853 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 854 if (bp2) 855 brelse(bp2); 856 break; 857 } 858 case ISO_FTYPE_RRIP: 859 cd9660_rrip_analyze(isodir, ip, imp); 860 break; 861 } 862 863 if (bp != NULL) 864 brelse(bp); 865 866 /* 867 * Initialize the associated vnode 868 */ 869 vp->v_type = IFTOVT(ip->inode.iso_mode); 870 871 switch (vp->v_type) { 872 case VFIFO: 873 vp->v_ops = &mp->mnt_vn_fifo_ops; 874 break; 875 case VCHR: 876 case VBLK: 877 vp->v_ops = &mp->mnt_vn_spec_ops; 878 addaliasu(vp, umajor(ip->inode.iso_rdev), 879 uminor(ip->inode.iso_rdev)); 880 break; 881 case VREG: 882 case VDIR: 883 vinitvmio(vp, ip->i_size, PAGE_SIZE, -1); 884 break; 885 default: 886 break; 887 } 888 889 if (ip->iso_extent == imp->root_extent) 890 vsetflags(vp, VROOT); 891 892 /* 893 * Return the locked and refd vp 894 */ 895 *vpp = vp; 896 return (0); 897 } 898 899 /* 900 * Vnode pointer to File handle 901 */ 902 /* ARGSUSED */ 903 int 904 cd9660_vptofh(struct vnode *vp, struct fid *fhp) 905 { 906 struct iso_node *ip = VTOI(vp); 907 struct ifid *ifhp; 908 909 ifhp = (struct ifid *)fhp; 910 ifhp->ifid_len = sizeof(struct ifid); 911 912 ifhp->ifid_ino = ip->i_number; 913 ifhp->ifid_start = ip->iso_start; 914 915 #ifdef ISOFS_DBG 916 kprintf("vptofh: ino %d, start %ld\n", 917 ifhp->ifid_ino,ifhp->ifid_start); 918 #endif 919 return 0; 920 } 921