Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/fs/cd9660/cd9660_vfsops.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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@blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai@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 __FBSDID("$FreeBSD: releng/12.0/sys/fs/cd9660/cd9660_vfsops.c 336965 2018-07-31 12:36:46Z emaste $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/namei.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/kernel.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/cdio.h> 53 #include <sys/conf.h> 54 #include <sys/fcntl.h> 55 #include <sys/malloc.h> 56 #include <sys/stat.h> 57 #include <sys/syslog.h> 58 #include <sys/iconv.h> 59 60 #include <fs/cd9660/iso.h> 61 #include <fs/cd9660/iso_rrip.h> 62 #include <fs/cd9660/cd9660_node.h> 63 #include <fs/cd9660/cd9660_mount.h> 64 65 #include <geom/geom.h> 66 #include <geom/geom_vfs.h> 67 68 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure"); 69 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part"); 70 71 struct iconv_functions *cd9660_iconv = NULL; 72 73 static vfs_mount_t cd9660_mount; 74 static vfs_cmount_t cd9660_cmount; 75 static vfs_unmount_t cd9660_unmount; 76 static vfs_root_t cd9660_root; 77 static vfs_statfs_t cd9660_statfs; 78 static vfs_vget_t cd9660_vget; 79 static vfs_fhtovp_t cd9660_fhtovp; 80 81 static struct vfsops cd9660_vfsops = { 82 .vfs_fhtovp = cd9660_fhtovp, 83 .vfs_mount = cd9660_mount, 84 .vfs_cmount = cd9660_cmount, 85 .vfs_root = cd9660_root, 86 .vfs_statfs = cd9660_statfs, 87 .vfs_unmount = cd9660_unmount, 88 .vfs_vget = cd9660_vget, 89 }; 90 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY); 91 MODULE_VERSION(cd9660, 1); 92 93 static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino); 94 static int iso_mountfs(struct vnode *devvp, struct mount *mp); 95 96 /* 97 * VFS Operations. 98 */ 99 100 static int 101 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags) 102 { 103 struct iso_args args; 104 struct export_args exp; 105 int error; 106 107 error = copyin(data, &args, sizeof args); 108 if (error) 109 return (error); 110 vfs_oexport_conv(&args.export, &exp); 111 112 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 113 ma = mount_arg(ma, "export", &exp, sizeof(exp)); 114 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64); 115 ma = mount_argsu(ma, "cs_local", args.cs_local, 64); 116 ma = mount_argf(ma, "ssector", "%u", args.ssector); 117 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip"); 118 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens"); 119 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt"); 120 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet"); 121 ma = mount_argb(ma, 122 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet"); 123 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv"); 124 125 error = kernel_mount(ma, flags); 126 127 return (error); 128 } 129 130 static int 131 cd9660_mount(struct mount *mp) 132 { 133 struct vnode *devvp; 134 struct thread *td; 135 char *fspec; 136 int error; 137 accmode_t accmode; 138 struct nameidata ndp; 139 struct iso_mnt *imp = NULL; 140 141 td = curthread; 142 143 /* 144 * Unconditionally mount as read-only. 145 */ 146 MNT_ILOCK(mp); 147 mp->mnt_flag |= MNT_RDONLY; 148 MNT_IUNLOCK(mp); 149 150 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 151 if (error) 152 return (error); 153 154 imp = VFSTOISOFS(mp); 155 156 if (mp->mnt_flag & MNT_UPDATE) { 157 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) 158 return (0); 159 } 160 /* 161 * Not an update, or updating the name: look up the name 162 * and verify that it refers to a sensible block device. 163 */ 164 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 165 if ((error = namei(&ndp))) 166 return (error); 167 NDFREE(&ndp, NDF_ONLY_PNBUF); 168 devvp = ndp.ni_vp; 169 170 if (!vn_isdisk(devvp, &error)) { 171 vput(devvp); 172 return (error); 173 } 174 175 /* 176 * Verify that user has necessary permissions on the device, 177 * or has superuser abilities 178 */ 179 accmode = VREAD; 180 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 181 if (error) 182 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 183 if (error) { 184 vput(devvp); 185 return (error); 186 } 187 188 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 189 error = iso_mountfs(devvp, mp); 190 if (error) 191 vrele(devvp); 192 } else { 193 if (devvp != imp->im_devvp) 194 error = EINVAL; /* needs translation */ 195 vput(devvp); 196 } 197 if (error) 198 return (error); 199 vfs_mountedfrom(mp, fspec); 200 return (0); 201 } 202 203 /* 204 * Common code for mount and mountroot 205 */ 206 static int 207 iso_mountfs(devvp, mp) 208 struct vnode *devvp; 209 struct mount *mp; 210 { 211 struct iso_mnt *isomp = NULL; 212 struct buf *bp = NULL; 213 struct buf *pribp = NULL, *supbp = NULL; 214 struct cdev *dev; 215 int error = EINVAL; 216 int high_sierra = 0; 217 int iso_bsize; 218 int iso_blknum; 219 int joliet_level; 220 int isverified = 0; 221 struct iso_volume_descriptor *vdp = NULL; 222 struct iso_primary_descriptor *pri = NULL; 223 struct iso_sierra_primary_descriptor *pri_sierra = NULL; 224 struct iso_supplementary_descriptor *sup = NULL; 225 struct iso_directory_record *rootp; 226 int logical_block_size, ssector; 227 struct g_consumer *cp; 228 struct bufobj *bo; 229 char *cs_local, *cs_disk; 230 231 dev = devvp->v_rdev; 232 dev_ref(dev); 233 g_topology_lock(); 234 error = g_vfs_open(devvp, &cp, "cd9660", 0); 235 if (error == 0) 236 g_getattr("MNT::verified", cp, &isverified); 237 g_topology_unlock(); 238 VOP_UNLOCK(devvp, 0); 239 if (error) 240 goto out; 241 if (devvp->v_rdev->si_iosize_max != 0) 242 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 243 if (mp->mnt_iosize_max > MAXPHYS) 244 mp->mnt_iosize_max = MAXPHYS; 245 246 bo = &devvp->v_bufobj; 247 248 /* This is the "logical sector size". The standard says this 249 * should be 2048 or the physical sector size on the device, 250 * whichever is greater. 251 */ 252 if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) { 253 error = EINVAL; 254 goto out; 255 } 256 257 iso_bsize = cp->provider->sectorsize; 258 259 joliet_level = 0; 260 if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector)) 261 ssector = 0; 262 for (iso_blknum = 16 + ssector; 263 iso_blknum < 100 + ssector; 264 iso_blknum++) { 265 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE), 266 iso_bsize, NOCRED, &bp)) != 0) 267 goto out; 268 269 vdp = (struct iso_volume_descriptor *)bp->b_data; 270 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 271 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID, 272 sizeof vdp->id_sierra) != 0) { 273 error = EINVAL; 274 goto out; 275 } else 276 high_sierra = 1; 277 } 278 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){ 279 case ISO_VD_PRIMARY: 280 if (pribp == NULL) { 281 pribp = bp; 282 bp = NULL; 283 pri = (struct iso_primary_descriptor *)vdp; 284 pri_sierra = 285 (struct iso_sierra_primary_descriptor *)vdp; 286 } 287 break; 288 289 case ISO_VD_SUPPLEMENTARY: 290 if (supbp == NULL) { 291 supbp = bp; 292 bp = NULL; 293 sup = (struct iso_supplementary_descriptor *)vdp; 294 295 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) { 296 if (bcmp(sup->escape, "%/@", 3) == 0) 297 joliet_level = 1; 298 if (bcmp(sup->escape, "%/C", 3) == 0) 299 joliet_level = 2; 300 if (bcmp(sup->escape, "%/E", 3) == 0) 301 joliet_level = 3; 302 303 if ((isonum_711 (sup->flags) & 1) && 304 !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0)) 305 joliet_level = 0; 306 } 307 } 308 break; 309 310 case ISO_VD_END: 311 goto vd_end; 312 313 default: 314 break; 315 } 316 if (bp != NULL) { 317 brelse(bp); 318 bp = NULL; 319 } 320 } 321 vd_end: 322 if (bp != NULL) { 323 brelse(bp); 324 bp = NULL; 325 } 326 327 if (pri == NULL) { 328 error = EINVAL; 329 goto out; 330 } 331 332 logical_block_size = 333 isonum_723 (high_sierra? 334 pri_sierra->logical_block_size: 335 pri->logical_block_size); 336 337 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 338 || (logical_block_size & (logical_block_size - 1)) != 0) { 339 error = EINVAL; 340 goto out; 341 } 342 343 rootp = (struct iso_directory_record *) 344 (high_sierra? 345 pri_sierra->root_directory_record: 346 pri->root_directory_record); 347 348 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 349 isomp->im_cp = cp; 350 isomp->im_bo = bo; 351 isomp->logical_block_size = logical_block_size; 352 isomp->volume_space_size = 353 isonum_733 (high_sierra? 354 pri_sierra->volume_space_size: 355 pri->volume_space_size); 356 isomp->joliet_level = 0; 357 /* 358 * Since an ISO9660 multi-session CD can also access previous 359 * sessions, we have to include them into the space consider- 360 * ations. This doesn't yield a very accurate number since 361 * parts of the old sessions might be inaccessible now, but we 362 * can't do much better. This is also important for the NFS 363 * filehandle validation. 364 */ 365 isomp->volume_space_size += ssector; 366 memcpy(isomp->root, rootp, sizeof isomp->root); 367 isomp->root_extent = isonum_733 (rootp->extent); 368 isomp->root_size = isonum_733 (rootp->size); 369 370 isomp->im_bmask = logical_block_size - 1; 371 isomp->im_bshift = ffs(logical_block_size) - 1; 372 373 pribp->b_flags |= B_AGE; 374 brelse(pribp); 375 pribp = NULL; 376 rootp = NULL; 377 pri = NULL; 378 pri_sierra = NULL; 379 380 mp->mnt_data = isomp; 381 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 382 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 383 mp->mnt_maxsymlinklen = 0; 384 MNT_ILOCK(mp); 385 if (isverified) 386 mp->mnt_flag |= MNT_VERIFIED; 387 mp->mnt_flag |= MNT_LOCAL; 388 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 389 MNT_IUNLOCK(mp); 390 isomp->im_mountp = mp; 391 isomp->im_dev = dev; 392 isomp->im_devvp = devvp; 393 394 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP); 395 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS); 396 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT); 397 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET); 398 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV); 399 400 /* Check the Rock Ridge Extension support */ 401 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) { 402 if ((error = bread(isomp->im_devvp, (isomp->root_extent + 403 isonum_711(((struct iso_directory_record *)isomp->root)-> 404 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT), 405 isomp->logical_block_size, NOCRED, &bp)) != 0) 406 goto out; 407 408 rootp = (struct iso_directory_record *)bp->b_data; 409 410 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 411 isomp->im_flags |= ISOFSMNT_NORRIP; 412 } else { 413 isomp->im_flags &= ~ISOFSMNT_GENS; 414 } 415 416 /* 417 * The contents are valid, 418 * but they will get reread as part of another vnode, so... 419 */ 420 bp->b_flags |= B_AGE; 421 brelse(bp); 422 bp = NULL; 423 rootp = NULL; 424 } 425 426 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 427 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error); 428 if (error) 429 goto out; 430 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error); 431 if (error) 432 goto out; 433 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 434 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 435 } else { 436 isomp->im_d2l = NULL; 437 isomp->im_l2d = NULL; 438 } 439 440 if (high_sierra) { 441 /* this effectively ignores all the mount flags */ 442 if (bootverbose) 443 log(LOG_INFO, "cd9660: High Sierra Format\n"); 444 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 445 } else 446 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 447 default: 448 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 449 break; 450 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 451 isomp->iso_ftype = ISO_FTYPE_9660; 452 break; 453 case 0: 454 if (bootverbose) 455 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 456 isomp->iso_ftype = ISO_FTYPE_RRIP; 457 break; 458 } 459 460 /* Decide whether to use the Joliet descriptor */ 461 462 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 463 if (bootverbose) 464 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 465 joliet_level); 466 rootp = (struct iso_directory_record *) 467 sup->root_directory_record; 468 memcpy(isomp->root, rootp, sizeof isomp->root); 469 isomp->root_extent = isonum_733 (rootp->extent); 470 isomp->root_size = isonum_733 (rootp->size); 471 isomp->joliet_level = joliet_level; 472 supbp->b_flags |= B_AGE; 473 } 474 475 if (supbp) { 476 brelse(supbp); 477 supbp = NULL; 478 sup = NULL; 479 } 480 481 return 0; 482 out: 483 if (bp != NULL) 484 brelse(bp); 485 if (pribp != NULL) 486 brelse(pribp); 487 if (supbp != NULL) 488 brelse(supbp); 489 if (cp != NULL) { 490 g_topology_lock(); 491 g_vfs_close(cp); 492 g_topology_unlock(); 493 } 494 if (isomp) { 495 free(isomp, M_ISOFSMNT); 496 mp->mnt_data = NULL; 497 } 498 dev_rel(dev); 499 return error; 500 } 501 502 /* 503 * unmount system call 504 */ 505 static int 506 cd9660_unmount(mp, mntflags) 507 struct mount *mp; 508 int mntflags; 509 { 510 struct iso_mnt *isomp; 511 int error, flags = 0; 512 513 if (mntflags & MNT_FORCE) 514 flags |= FORCECLOSE; 515 if ((error = vflush(mp, 0, flags, curthread))) 516 return (error); 517 518 isomp = VFSTOISOFS(mp); 519 520 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 521 if (isomp->im_d2l) 522 cd9660_iconv->close(isomp->im_d2l); 523 if (isomp->im_l2d) 524 cd9660_iconv->close(isomp->im_l2d); 525 } 526 g_topology_lock(); 527 g_vfs_close(isomp->im_cp); 528 g_topology_unlock(); 529 vrele(isomp->im_devvp); 530 dev_rel(isomp->im_dev); 531 free(isomp, M_ISOFSMNT); 532 mp->mnt_data = NULL; 533 MNT_ILOCK(mp); 534 mp->mnt_flag &= ~MNT_LOCAL; 535 MNT_IUNLOCK(mp); 536 return (error); 537 } 538 539 /* 540 * Return root of a filesystem 541 */ 542 static int 543 cd9660_root(mp, flags, vpp) 544 struct mount *mp; 545 int flags; 546 struct vnode **vpp; 547 { 548 struct iso_mnt *imp = VFSTOISOFS(mp); 549 struct iso_directory_record *dp = 550 (struct iso_directory_record *)imp->root; 551 cd_ino_t ino = isodirino(dp, imp); 552 553 /* 554 * With RRIP we must use the `.' entry of the root directory. 555 * Simply tell vget, that it's a relocated directory. 556 */ 557 return (cd9660_vget_internal(mp, ino, flags, vpp, 558 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 559 } 560 561 /* 562 * Get filesystem statistics. 563 */ 564 static int 565 cd9660_statfs(mp, sbp) 566 struct mount *mp; 567 struct statfs *sbp; 568 { 569 struct iso_mnt *isomp; 570 571 isomp = VFSTOISOFS(mp); 572 573 sbp->f_bsize = isomp->logical_block_size; 574 sbp->f_iosize = sbp->f_bsize; /* XXX */ 575 sbp->f_blocks = isomp->volume_space_size; 576 sbp->f_bfree = 0; /* total free blocks */ 577 sbp->f_bavail = 0; /* blocks free for non superuser */ 578 sbp->f_files = 0; /* total files */ 579 sbp->f_ffree = 0; /* free file nodes */ 580 return 0; 581 } 582 583 /* 584 * File handle to vnode 585 * 586 * Have to be really careful about stale file handles: 587 * - check that the inode number is in range 588 * - call iget() to get the locked inode 589 * - check for an unallocated inode (i_mode == 0) 590 * - check that the generation number matches 591 */ 592 593 /* ARGSUSED */ 594 static int 595 cd9660_fhtovp(mp, fhp, flags, vpp) 596 struct mount *mp; 597 struct fid *fhp; 598 int flags; 599 struct vnode **vpp; 600 { 601 struct ifid ifh; 602 struct iso_node *ip; 603 struct vnode *nvp; 604 int error; 605 606 memcpy(&ifh, fhp, sizeof(ifh)); 607 608 #ifdef ISOFS_DBG 609 printf("fhtovp: ino %d, start %ld\n", 610 ifh.ifid_ino, ifh.ifid_start); 611 #endif 612 613 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 614 *vpp = NULLVP; 615 return (error); 616 } 617 ip = VTOI(nvp); 618 if (ip->inode.iso_mode == 0) { 619 vput(nvp); 620 *vpp = NULLVP; 621 return (ESTALE); 622 } 623 *vpp = nvp; 624 vnode_create_vobject(*vpp, ip->i_size, curthread); 625 return (0); 626 } 627 628 /* 629 * Conform to standard VFS interface; can't vget arbitrary inodes beyond 4GB 630 * into media with current inode scheme and 32-bit ino_t. This shouldn't be 631 * needed for anything other than nfsd, and who exports a mounted DVD over NFS? 632 */ 633 static int 634 cd9660_vget(mp, ino, flags, vpp) 635 struct mount *mp; 636 ino_t ino; 637 int flags; 638 struct vnode **vpp; 639 { 640 641 /* 642 * XXXX 643 * It would be nice if we didn't always set the `relocated' flag 644 * and force the extra read, but I don't want to think about fixing 645 * that right now. 646 */ 647 return (cd9660_vget_internal(mp, ino, flags, vpp, 648 #if 0 649 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 650 #else 651 0, 652 #endif 653 (struct iso_directory_record *)0)); 654 } 655 656 /* Use special comparator for full 64-bit ino comparison. */ 657 static int 658 cd9660_vfs_hash_cmp(vp, pino) 659 struct vnode *vp; 660 void *pino; 661 { 662 struct iso_node *ip; 663 cd_ino_t ino; 664 665 ip = VTOI(vp); 666 ino = *(cd_ino_t *)pino; 667 return (ip->i_number != ino); 668 } 669 670 int 671 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir) 672 struct mount *mp; 673 cd_ino_t ino; 674 int flags; 675 struct vnode **vpp; 676 int relocated; 677 struct iso_directory_record *isodir; 678 { 679 struct iso_mnt *imp; 680 struct iso_node *ip; 681 struct buf *bp; 682 struct vnode *vp; 683 int error; 684 struct thread *td; 685 686 td = curthread; 687 error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp, 688 &ino); 689 if (error || *vpp != NULL) 690 return (error); 691 692 /* 693 * We must promote to an exclusive lock for vnode creation. This 694 * can happen if lookup is passed LOCKSHARED. 695 */ 696 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 697 flags &= ~LK_TYPE_MASK; 698 flags |= LK_EXCLUSIVE; 699 } 700 701 /* 702 * We do not lock vnode creation as it is believed to be too 703 * expensive for such rare case as simultaneous creation of vnode 704 * for same ino by different processes. We just allow them to race 705 * and check later to decide who wins. Let the race begin! 706 */ 707 708 imp = VFSTOISOFS(mp); 709 710 /* Allocate a new vnode/iso_node. */ 711 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) { 712 *vpp = NULLVP; 713 return (error); 714 } 715 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE, 716 M_WAITOK | M_ZERO); 717 vp->v_data = ip; 718 ip->i_vnode = vp; 719 ip->i_number = ino; 720 721 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 722 error = insmntque(vp, mp); 723 if (error != 0) { 724 free(ip, M_ISOFSNODE); 725 *vpp = NULLVP; 726 return (error); 727 } 728 error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp, 729 &ino); 730 if (error || *vpp != NULL) 731 return (error); 732 733 if (isodir == NULL) { 734 int lbn, off; 735 736 lbn = lblkno(imp, ino); 737 if (lbn >= imp->volume_space_size) { 738 vput(vp); 739 printf("fhtovp: lbn exceed volume space %d\n", lbn); 740 return (ESTALE); 741 } 742 743 off = blkoff(imp, ino); 744 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 745 vput(vp); 746 printf("fhtovp: crosses block boundary %d\n", 747 off + ISO_DIRECTORY_RECORD_SIZE); 748 return (ESTALE); 749 } 750 751 error = bread(imp->im_devvp, 752 lbn << (imp->im_bshift - DEV_BSHIFT), 753 imp->logical_block_size, NOCRED, &bp); 754 if (error) { 755 vput(vp); 756 brelse(bp); 757 printf("fhtovp: bread error %d\n",error); 758 return (error); 759 } 760 isodir = (struct iso_directory_record *)(bp->b_data + off); 761 762 if (off + isonum_711(isodir->length) > 763 imp->logical_block_size) { 764 vput(vp); 765 brelse(bp); 766 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 767 off +isonum_711(isodir->length), off, 768 isonum_711(isodir->length)); 769 return (ESTALE); 770 } 771 772 #if 0 773 if (isonum_733(isodir->extent) + 774 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 775 brelse(bp); 776 printf("fhtovp: file start miss %d vs %d\n", 777 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 778 ifhp->ifid_start); 779 return (ESTALE); 780 } 781 #endif 782 } else 783 bp = NULL; 784 785 ip->i_mnt = imp; 786 787 if (relocated) { 788 /* 789 * On relocated directories we must 790 * read the `.' entry out of a dir. 791 */ 792 ip->iso_start = ino >> imp->im_bshift; 793 if (bp != NULL) 794 brelse(bp); 795 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 796 vput(vp); 797 return (error); 798 } 799 isodir = (struct iso_directory_record *)bp->b_data; 800 } 801 802 ip->iso_extent = isonum_733(isodir->extent); 803 ip->i_size = isonum_733(isodir->size); 804 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 805 806 /* 807 * Setup time stamp, attribute 808 */ 809 vp->v_type = VNON; 810 switch (imp->iso_ftype) { 811 default: /* ISO_FTYPE_9660 */ 812 { 813 struct buf *bp2; 814 int off; 815 if ((imp->im_flags & ISOFSMNT_EXTATT) 816 && (off = isonum_711(isodir->ext_attr_length))) 817 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 818 &bp2); 819 else 820 bp2 = NULL; 821 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 822 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 823 if (bp2) 824 brelse(bp2); 825 break; 826 } 827 case ISO_FTYPE_RRIP: 828 cd9660_rrip_analyze(isodir, ip, imp); 829 break; 830 } 831 832 brelse(bp); 833 834 /* 835 * Initialize the associated vnode 836 */ 837 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 838 case VFIFO: 839 vp->v_op = &cd9660_fifoops; 840 break; 841 default: 842 VN_LOCK_ASHARE(vp); 843 break; 844 } 845 846 if (ip->iso_extent == imp->root_extent) 847 vp->v_vflag |= VV_ROOT; 848 849 /* 850 * XXX need generation number? 851 */ 852 853 *vpp = vp; 854 return (0); 855 }
Cache object: 118980c8e1b4bc0fc90e525eebeced2f
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]