xref: /freebsd/sys/fs/cd9660/cd9660_vfsops.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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  * 4. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  *	@(#)cd9660_vfsops.c	8.18 (Berkeley) 5/22/95
35  */
36 
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39 
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/namei.h>
43 #include <sys/priv.h>
44 #include <sys/proc.h>
45 #include <sys/kernel.h>
46 #include <sys/vnode.h>
47 #include <sys/mount.h>
48 #include <sys/bio.h>
49 #include <sys/buf.h>
50 #include <sys/cdio.h>
51 #include <sys/conf.h>
52 #include <sys/fcntl.h>
53 #include <sys/malloc.h>
54 #include <sys/stat.h>
55 #include <sys/syslog.h>
56 #include <sys/iconv.h>
57 
58 #include <fs/cd9660/iso.h>
59 #include <fs/cd9660/iso_rrip.h>
60 #include <fs/cd9660/cd9660_node.h>
61 #include <fs/cd9660/cd9660_mount.h>
62 
63 #include <geom/geom.h>
64 #include <geom/geom_vfs.h>
65 
66 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure");
67 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part");
68 
69 struct iconv_functions *cd9660_iconv = NULL;
70 
71 static vfs_mount_t	cd9660_mount;
72 static vfs_cmount_t	cd9660_cmount;
73 static vfs_unmount_t	cd9660_unmount;
74 static vfs_root_t	cd9660_root;
75 static vfs_statfs_t	cd9660_statfs;
76 static vfs_vget_t	cd9660_vget;
77 static vfs_fhtovp_t	cd9660_fhtovp;
78 
79 static struct vfsops cd9660_vfsops = {
80 	.vfs_fhtovp =		cd9660_fhtovp,
81 	.vfs_mount =		cd9660_mount,
82 	.vfs_cmount =		cd9660_cmount,
83 	.vfs_root =		cd9660_root,
84 	.vfs_statfs =		cd9660_statfs,
85 	.vfs_unmount =		cd9660_unmount,
86 	.vfs_vget =		cd9660_vget,
87 };
88 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
89 MODULE_VERSION(cd9660, 1);
90 
91 static int iso_mountfs(struct vnode *devvp, struct mount *mp,
92 		       struct thread *td);
93 
94 /*
95  * VFS Operations.
96  */
97 
98 static int
99 cd9660_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
100 {
101 	struct iso_args args;
102 	int error;
103 
104 	error = copyin(data, &args, sizeof args);
105 	if (error)
106 		return (error);
107 
108 	ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
109 	ma = mount_arg(ma, "export", &args.export, sizeof args.export);
110 	ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64);
111 	ma = mount_argsu(ma, "cs_local", args.cs_local, 64);
112 	ma = mount_argf(ma, "ssector", "%u", args.ssector);
113 	ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip");
114 	ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens");
115 	ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt");
116 	ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet");
117 	ma = mount_argb(ma,
118 	    args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet");
119 	ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv");
120 
121 	error = kernel_mount(ma, flags);
122 
123 	return (error);
124 }
125 
126 static int
127 cd9660_mount(struct mount *mp, struct thread *td)
128 {
129 	struct vnode *devvp;
130 	char *fspec;
131 	int error;
132 	mode_t accessmode;
133 	struct nameidata ndp;
134 	struct iso_mnt *imp = 0;
135 
136 	/*
137 	 * Unconditionally mount as read-only.
138 	 */
139 	MNT_ILOCK(mp);
140 	mp->mnt_flag |= MNT_RDONLY;
141 	MNT_IUNLOCK(mp);
142 
143 	fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
144 	if (error)
145 		return (error);
146 
147 	imp = VFSTOISOFS(mp);
148 
149 	if (mp->mnt_flag & MNT_UPDATE) {
150 		if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
151 			return (0);
152 	}
153 	/*
154 	 * Not an update, or updating the name: look up the name
155 	 * and verify that it refers to a sensible block device.
156 	 */
157 	NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, td);
158 	if ((error = namei(&ndp)))
159 		return (error);
160 	NDFREE(&ndp, NDF_ONLY_PNBUF);
161 	devvp = ndp.ni_vp;
162 
163 	if (!vn_isdisk(devvp, &error)) {
164 		vrele(devvp);
165 		return (error);
166 	}
167 
168 	/*
169 	 * Verify that user has necessary permissions on the device,
170 	 * or has superuser abilities
171 	 */
172 	accessmode = VREAD;
173 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
174 	error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td);
175 	if (error)
176 		error = priv_check(td, PRIV_VFS_MOUNT_PERM);
177 	if (error) {
178 		vput(devvp);
179 		return (error);
180 	}
181 	VOP_UNLOCK(devvp, 0);
182 
183 	if ((mp->mnt_flag & MNT_UPDATE) == 0) {
184 		error = iso_mountfs(devvp, mp, td);
185 	} else {
186 		if (devvp != imp->im_devvp)
187 			error = EINVAL;	/* needs translation */
188 		else
189 			vrele(devvp);
190 	}
191 	if (error) {
192 		vrele(devvp);
193 		return error;
194 	}
195 	vfs_mountedfrom(mp, fspec);
196 	return 0;
197 }
198 
199 /*
200  * Common code for mount and mountroot
201  */
202 static int
203 iso_mountfs(devvp, mp, td)
204 	struct vnode *devvp;
205 	struct mount *mp;
206 	struct thread *td;
207 {
208 	struct iso_mnt *isomp = (struct iso_mnt *)0;
209 	struct buf *bp = NULL;
210 	struct buf *pribp = NULL, *supbp = NULL;
211 	struct cdev *dev = devvp->v_rdev;
212 	int error = EINVAL;
213 	int high_sierra = 0;
214 	int iso_bsize;
215 	int iso_blknum;
216 	int joliet_level;
217 	struct iso_volume_descriptor *vdp = 0;
218 	struct iso_primary_descriptor *pri = NULL;
219 	struct iso_sierra_primary_descriptor *pri_sierra = NULL;
220 	struct iso_supplementary_descriptor *sup = NULL;
221 	struct iso_directory_record *rootp;
222 	int logical_block_size, ssector;
223 	struct g_consumer *cp;
224 	struct bufobj *bo;
225 	char *cs_local, *cs_disk;
226 
227 	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
228 	DROP_GIANT();
229 	g_topology_lock();
230 	error = g_vfs_open(devvp, &cp, "cd9660", 0);
231 	g_topology_unlock();
232 	PICKUP_GIANT();
233 	VOP_UNLOCK(devvp, 0);
234 	if (error)
235 		return error;
236 	if (devvp->v_rdev->si_iosize_max != 0)
237 		mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
238 	if (mp->mnt_iosize_max > MAXPHYS)
239 		mp->mnt_iosize_max = MAXPHYS;
240 
241 	bo = &devvp->v_bufobj;
242 	bo->bo_private = cp;
243 	bo->bo_ops = g_vfs_bufops;
244 
245 	/* This is the "logical sector size".  The standard says this
246 	 * should be 2048 or the physical sector size on the device,
247 	 * whichever is greater.
248 	 */
249 	if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) {
250 		DROP_GIANT();
251 		g_topology_lock();
252 		g_vfs_close(cp, td);
253 		g_topology_unlock();
254                 PICKUP_GIANT();
255 		return (EINVAL);
256 	}
257 
258 	iso_bsize = cp->provider->sectorsize;
259 
260 	joliet_level = 0;
261 	if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector))
262 		ssector = 0;
263 	for (iso_blknum = 16 + ssector;
264 	     iso_blknum < 100 + ssector;
265 	     iso_blknum++) {
266 		if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE),
267 				  iso_bsize, NOCRED, &bp)) != 0)
268 			goto out;
269 
270 		vdp = (struct iso_volume_descriptor *)bp->b_data;
271 		if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
272 			if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
273 				  sizeof vdp->id) != 0) {
274 				error = EINVAL;
275 				goto out;
276 			} else
277 				high_sierra = 1;
278 		}
279 		switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
280 		case ISO_VD_PRIMARY:
281 			if (pribp == NULL) {
282 				pribp = bp;
283 				bp = NULL;
284 				pri = (struct iso_primary_descriptor *)vdp;
285 				pri_sierra =
286 				  (struct iso_sierra_primary_descriptor *)vdp;
287 			}
288 			break;
289 
290 		case ISO_VD_SUPPLEMENTARY:
291 			if (supbp == NULL) {
292 				supbp = bp;
293 				bp = NULL;
294 				sup = (struct iso_supplementary_descriptor *)vdp;
295 
296 				if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) {
297 					if (bcmp(sup->escape, "%/@", 3) == 0)
298 						joliet_level = 1;
299 					if (bcmp(sup->escape, "%/C", 3) == 0)
300 						joliet_level = 2;
301 					if (bcmp(sup->escape, "%/E", 3) == 0)
302 						joliet_level = 3;
303 
304 					if ((isonum_711 (sup->flags) & 1) &&
305 					    !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0))
306 						joliet_level = 0;
307 				}
308 			}
309 			break;
310 
311 		case ISO_VD_END:
312 			goto vd_end;
313 
314 		default:
315 			break;
316 		}
317 		if (bp) {
318 			brelse(bp);
319 			bp = NULL;
320 		}
321 	}
322  vd_end:
323 	if (bp) {
324 		brelse(bp);
325 		bp = NULL;
326 	}
327 
328 	if (pri == NULL) {
329 		error = EINVAL;
330 		goto out;
331 	}
332 
333 	logical_block_size =
334 		isonum_723 (high_sierra?
335 			    pri_sierra->logical_block_size:
336 			    pri->logical_block_size);
337 
338 	if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
339 	    || (logical_block_size & (logical_block_size - 1)) != 0) {
340 		error = EINVAL;
341 		goto out;
342 	}
343 
344 	rootp = (struct iso_directory_record *)
345 		(high_sierra?
346 		 pri_sierra->root_directory_record:
347 		 pri->root_directory_record);
348 
349 	isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
350 	isomp->im_cp = cp;
351 	isomp->im_bo = bo;
352 	isomp->logical_block_size = logical_block_size;
353 	isomp->volume_space_size =
354 		isonum_733 (high_sierra?
355 			    pri_sierra->volume_space_size:
356 			    pri->volume_space_size);
357 	isomp->joliet_level = 0;
358 	/*
359 	 * Since an ISO9660 multi-session CD can also access previous
360 	 * sessions, we have to include them into the space consider-
361 	 * ations.  This doesn't yield a very accurate number since
362 	 * parts of the old sessions might be inaccessible now, but we
363 	 * can't do much better.  This is also important for the NFS
364 	 * filehandle validation.
365 	 */
366 	isomp->volume_space_size += ssector;
367 	bcopy (rootp, isomp->root, sizeof isomp->root);
368 	isomp->root_extent = isonum_733 (rootp->extent);
369 	isomp->root_size = isonum_733 (rootp->size);
370 
371 	isomp->im_bmask = logical_block_size - 1;
372 	isomp->im_bshift = ffs(logical_block_size) - 1;
373 
374 	pribp->b_flags |= B_AGE;
375 	brelse(pribp);
376 	pribp = NULL;
377 
378 	mp->mnt_data = isomp;
379 	mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
380 	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
381 	mp->mnt_maxsymlinklen = 0;
382 	MNT_ILOCK(mp);
383 	mp->mnt_flag |= MNT_LOCAL;
384 	MNT_IUNLOCK(mp);
385 	isomp->im_mountp = mp;
386 	isomp->im_dev = dev;
387 	isomp->im_devvp = devvp;
388 
389 	vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
390 	vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
391 	vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
392 	vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
393 	vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);
394 
395 	/* Check the Rock Ridge Extension support */
396 	if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
397 		if ((error = bread(isomp->im_devvp,
398 				  (isomp->root_extent + isonum_711(rootp->ext_attr_length)) <<
399 				  (isomp->im_bshift - DEV_BSHIFT),
400 				  isomp->logical_block_size, NOCRED, &bp)) != 0)
401 		    goto out;
402 
403 		rootp = (struct iso_directory_record *)bp->b_data;
404 
405 		if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
406 		    isomp->im_flags |= ISOFSMNT_NORRIP;
407 		} else {
408 		    isomp->im_flags &= ~ISOFSMNT_GENS;
409 		}
410 
411 		/*
412 		 * The contents are valid,
413 		 * but they will get reread as part of another vnode, so...
414 		 */
415 		bp->b_flags |= B_AGE;
416 		brelse(bp);
417 		bp = NULL;
418 	}
419 
420 	if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
421 		cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
422 		if (error)
423 			goto out;
424 		cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
425 		if (error)
426 			goto out;
427 		cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
428 		cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
429 	} else {
430 		isomp->im_d2l = NULL;
431 		isomp->im_l2d = NULL;
432 	}
433 
434 	if (high_sierra) {
435 		/* this effectively ignores all the mount flags */
436 		if (bootverbose)
437 			log(LOG_INFO, "cd9660: High Sierra Format\n");
438 		isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
439 	} else
440 		switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
441 		  default:
442 			  isomp->iso_ftype = ISO_FTYPE_DEFAULT;
443 			  break;
444 		  case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
445 			  isomp->iso_ftype = ISO_FTYPE_9660;
446 			  break;
447 		  case 0:
448 			  if (bootverbose)
449 			  	  log(LOG_INFO, "cd9660: RockRidge Extension\n");
450 			  isomp->iso_ftype = ISO_FTYPE_RRIP;
451 			  break;
452 		}
453 
454 	/* Decide whether to use the Joliet descriptor */
455 
456 	if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
457 		if (bootverbose)
458 			log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
459 			    joliet_level);
460 		rootp = (struct iso_directory_record *)
461 			sup->root_directory_record;
462 		bcopy (rootp, isomp->root, sizeof isomp->root);
463 		isomp->root_extent = isonum_733 (rootp->extent);
464 		isomp->root_size = isonum_733 (rootp->size);
465 		isomp->joliet_level = joliet_level;
466 		supbp->b_flags |= B_AGE;
467 	}
468 
469 	if (supbp) {
470 		brelse(supbp);
471 		supbp = NULL;
472 	}
473 
474 	return 0;
475 out:
476 	if (bp)
477 		brelse(bp);
478 	if (pribp)
479 		brelse(pribp);
480 	if (supbp)
481 		brelse(supbp);
482 	if (cp != NULL) {
483 		DROP_GIANT();
484 		g_topology_lock();
485 		g_vfs_close(cp, td);
486 		g_topology_unlock();
487 		PICKUP_GIANT();
488 	}
489 	if (isomp) {
490 		free((caddr_t)isomp, M_ISOFSMNT);
491 		mp->mnt_data = NULL;
492 	}
493 	return error;
494 }
495 
496 /*
497  * unmount system call
498  */
499 static int
500 cd9660_unmount(mp, mntflags, td)
501 	struct mount *mp;
502 	int mntflags;
503 	struct thread *td;
504 {
505 	struct iso_mnt *isomp;
506 	int error, flags = 0;
507 
508 	if (mntflags & MNT_FORCE)
509 		flags |= FORCECLOSE;
510 #if 0
511 	mntflushbuf(mp, 0);
512 	if (mntinvalbuf(mp))
513 		return EBUSY;
514 #endif
515 	if ((error = vflush(mp, 0, flags, td)))
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 	DROP_GIANT();
527 	g_topology_lock();
528 	g_vfs_close(isomp->im_cp, td);
529 	g_topology_unlock();
530 	PICKUP_GIANT();
531 	vrele(isomp->im_devvp);
532 	free((caddr_t)isomp, M_ISOFSMNT);
533 	mp->mnt_data = NULL;
534 	MNT_ILOCK(mp);
535 	mp->mnt_flag &= ~MNT_LOCAL;
536 	MNT_IUNLOCK(mp);
537 	return (error);
538 }
539 
540 /*
541  * Return root of a filesystem
542  */
543 static int
544 cd9660_root(mp, flags, vpp, td)
545 	struct mount *mp;
546 	int flags;
547 	struct vnode **vpp;
548 	struct thread *td;
549 {
550 	struct iso_mnt *imp = VFSTOISOFS(mp);
551 	struct iso_directory_record *dp =
552 	    (struct iso_directory_record *)imp->root;
553 	ino_t ino = isodirino(dp, imp);
554 
555 	/*
556 	 * With RRIP we must use the `.' entry of the root directory.
557 	 * Simply tell vget, that it's a relocated directory.
558 	 */
559 	return (cd9660_vget_internal(mp, ino, LK_EXCLUSIVE, vpp,
560 	    imp->iso_ftype == ISO_FTYPE_RRIP, dp));
561 }
562 
563 /*
564  * Get filesystem statistics.
565  */
566 static int
567 cd9660_statfs(mp, sbp, td)
568 	struct mount *mp;
569 	struct statfs *sbp;
570 	struct thread *td;
571 {
572 	struct iso_mnt *isomp;
573 
574 	isomp = VFSTOISOFS(mp);
575 
576 	sbp->f_bsize = isomp->logical_block_size;
577 	sbp->f_iosize = sbp->f_bsize;	/* XXX */
578 	sbp->f_blocks = isomp->volume_space_size;
579 	sbp->f_bfree = 0; /* total free blocks */
580 	sbp->f_bavail = 0; /* blocks free for non superuser */
581 	sbp->f_files =	0; /* total files */
582 	sbp->f_ffree = 0; /* free file nodes */
583 	return 0;
584 }
585 
586 /*
587  * File handle to vnode
588  *
589  * Have to be really careful about stale file handles:
590  * - check that the inode number is in range
591  * - call iget() to get the locked inode
592  * - check for an unallocated inode (i_mode == 0)
593  * - check that the generation number matches
594  */
595 
596 /* ARGSUSED */
597 static int
598 cd9660_fhtovp(mp, fhp, vpp)
599 	struct mount *mp;
600 	struct fid *fhp;
601 	struct vnode **vpp;
602 {
603 	struct ifid *ifhp = (struct ifid *)fhp;
604 	struct iso_node *ip;
605 	struct vnode *nvp;
606 	int error;
607 
608 #ifdef	ISOFS_DBG
609 	printf("fhtovp: ino %d, start %ld\n",
610 	       ifhp->ifid_ino, ifhp->ifid_start);
611 #endif
612 
613 	if ((error = VFS_VGET(mp, ifhp->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 static int
629 cd9660_vget(mp, ino, flags, vpp)
630 	struct mount *mp;
631 	ino_t ino;
632 	int flags;
633 	struct vnode **vpp;
634 {
635 
636 	/*
637 	 * XXXX
638 	 * It would be nice if we didn't always set the `relocated' flag
639 	 * and force the extra read, but I don't want to think about fixing
640 	 * that right now.
641 	 */
642 	return (cd9660_vget_internal(mp, ino, flags, vpp,
643 #if 0
644 	    VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
645 #else
646 	    0,
647 #endif
648 	    (struct iso_directory_record *)0));
649 }
650 
651 int
652 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir)
653 	struct mount *mp;
654 	ino_t ino;
655 	int flags;
656 	struct vnode **vpp;
657 	int relocated;
658 	struct iso_directory_record *isodir;
659 {
660 	struct iso_mnt *imp;
661 	struct iso_node *ip;
662 	struct buf *bp;
663 	struct vnode *vp;
664 	struct cdev *dev;
665 	int error;
666 	struct thread *td;
667 
668 	td = curthread;
669 	error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL);
670 	if (error || *vpp != NULL)
671 		return (error);
672 
673 	imp = VFSTOISOFS(mp);
674 	dev = imp->im_dev;
675 
676 	/* Allocate a new vnode/iso_node. */
677 	if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
678 		*vpp = NULLVP;
679 		return (error);
680 	}
681 	MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
682 	    M_WAITOK | M_ZERO);
683 	vp->v_data = ip;
684 	ip->i_vnode = vp;
685 	ip->i_number = ino;
686 
687 	lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL, td);
688 	error = insmntque(vp, mp);
689 	if (error != 0) {
690 		free(ip, M_ISOFSNODE);
691 		*vpp = NULLVP;
692 		return (error);
693 	}
694 	error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
695 	if (error || *vpp != NULL)
696 		return (error);
697 
698 	if (isodir == 0) {
699 		int lbn, off;
700 
701 		lbn = lblkno(imp, ino);
702 		if (lbn >= imp->volume_space_size) {
703 			vput(vp);
704 			printf("fhtovp: lbn exceed volume space %d\n", lbn);
705 			return (ESTALE);
706 		}
707 
708 		off = blkoff(imp, ino);
709 		if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
710 			vput(vp);
711 			printf("fhtovp: crosses block boundary %d\n",
712 			       off + ISO_DIRECTORY_RECORD_SIZE);
713 			return (ESTALE);
714 		}
715 
716 		error = bread(imp->im_devvp,
717 			      lbn << (imp->im_bshift - DEV_BSHIFT),
718 			      imp->logical_block_size, NOCRED, &bp);
719 		if (error) {
720 			vput(vp);
721 			brelse(bp);
722 			printf("fhtovp: bread error %d\n",error);
723 			return (error);
724 		}
725 		isodir = (struct iso_directory_record *)(bp->b_data + off);
726 
727 		if (off + isonum_711(isodir->length) >
728 		    imp->logical_block_size) {
729 			vput(vp);
730 			if (bp != 0)
731 				brelse(bp);
732 			printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
733 			       off +isonum_711(isodir->length), off,
734 			       isonum_711(isodir->length));
735 			return (ESTALE);
736 		}
737 
738 #if 0
739 		if (isonum_733(isodir->extent) +
740 		    isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
741 			if (bp != 0)
742 				brelse(bp);
743 			printf("fhtovp: file start miss %d vs %d\n",
744 			       isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
745 			       ifhp->ifid_start);
746 			return (ESTALE);
747 		}
748 #endif
749 	} else
750 		bp = 0;
751 
752 	ip->i_mnt = imp;
753 	VREF(imp->im_devvp);
754 
755 	if (relocated) {
756 		/*
757 		 * On relocated directories we must
758 		 * read the `.' entry out of a dir.
759 		 */
760 		ip->iso_start = ino >> imp->im_bshift;
761 		if (bp != 0)
762 			brelse(bp);
763 		if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
764 			vput(vp);
765 			return (error);
766 		}
767 		isodir = (struct iso_directory_record *)bp->b_data;
768 	}
769 
770 	ip->iso_extent = isonum_733(isodir->extent);
771 	ip->i_size = isonum_733(isodir->size);
772 	ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
773 
774 	/*
775 	 * Setup time stamp, attribute
776 	 */
777 	vp->v_type = VNON;
778 	switch (imp->iso_ftype) {
779 	default:	/* ISO_FTYPE_9660 */
780 	    {
781 		struct buf *bp2;
782 		int off;
783 		if ((imp->im_flags & ISOFSMNT_EXTATT)
784 		    && (off = isonum_711(isodir->ext_attr_length)))
785 			cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
786 				     &bp2);
787 		else
788 			bp2 = NULL;
789 		cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
790 		cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
791 		if (bp2)
792 			brelse(bp2);
793 		break;
794 	    }
795 	case ISO_FTYPE_RRIP:
796 		cd9660_rrip_analyze(isodir, ip, imp);
797 		break;
798 	}
799 
800 	if (bp != 0)
801 		brelse(bp);
802 
803 	/*
804 	 * Initialize the associated vnode
805 	 */
806 	switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
807 	case VFIFO:
808 		vp->v_op = &cd9660_fifoops;
809 		break;
810 	default:
811 		break;
812 	}
813 
814 	if (ip->iso_extent == imp->root_extent)
815 		vp->v_vflag |= VV_ROOT;
816 
817 	/*
818 	 * XXX need generation number?
819 	 */
820 
821 	*vpp = vp;
822 	return (0);
823 }
824