1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29/* udf_vfsops.c */
30/* Implement the VFS side of things */
31
32/*
33 * Ok, here's how it goes.  The UDF specs are pretty clear on how each data
34 * structure is made up, but not very clear on how they relate to each other.
35 * Here is the skinny... This demostrates a filesystem with one file in the
36 * root directory.  Subdirectories are treated just as normal files, but they
37 * have File Id Descriptors of their children as their file data.  As for the
38 * Anchor Volume Descriptor Pointer, it can exist in two of the following three
39 * places: sector 256, sector n (the max sector of the disk), or sector
40 * n - 256.  It's a pretty good bet that one will exist at sector 256 though.
41 * One caveat is unclosed CD media.  For that, sector 256 cannot be written,
42 * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the
43 * media is closed.
44 *
45 *  Sector:
46 *     256:
47 *       n: Anchor Volume Descriptor Pointer
48 * n - 256:	|
49 *		|
50 *		|-->Main Volume Descriptor Sequence
51 *			|	|
52 *			|	|
53 *			|	|-->Logical Volume Descriptor
54 *			|			  |
55 *			|-->Partition Descriptor  |
56 *				|		  |
57 *				|		  |
58 *				|-->Fileset Descriptor
59 *					|
60 *					|
61 *					|-->Root Dir File Entry
62 *						|
63 *						|
64 *						|-->File data:
65 *						    File Id Descriptor
66 *							|
67 *							|
68 *							|-->File Entry
69 *								|
70 *								|
71 *								|-->File data
72 */
73#include <sys/types.h>
74#include <sys/param.h>
75#include <sys/systm.h>
76#include <sys/uio.h>
77#include <sys/bio.h>
78#include <sys/buf.h>
79#include <sys/conf.h>
80#include <sys/dirent.h>
81#include <sys/fcntl.h>
82#include <sys/iconv.h>
83#include <sys/kernel.h>
84#include <sys/malloc.h>
85#include <sys/mount.h>
86#include <sys/namei.h>
87#include <sys/priv.h>
88#include <sys/proc.h>
89#include <sys/queue.h>
90#include <sys/vnode.h>
91#include <sys/endian.h>
92
93#include <geom/geom.h>
94#include <geom/geom_vfs.h>
95
96#include <vm/uma.h>
97
98#include <fs/udf/ecma167-udf.h>
99#include <fs/udf/osta.h>
100#include <fs/udf/udf.h>
101#include <fs/udf/udf_mount.h>
102
103static MALLOC_DEFINE(M_UDFMOUNT, "udf_mount", "UDF mount structure");
104MALLOC_DEFINE(M_UDFFENTRY, "udf_fentry", "UDF file entry structure");
105
106struct iconv_functions *udf_iconv = NULL;
107
108/* Zones */
109uma_zone_t udf_zone_trans = NULL;
110uma_zone_t udf_zone_node = NULL;
111uma_zone_t udf_zone_ds = NULL;
112
113static vfs_init_t      udf_init;
114static vfs_uninit_t    udf_uninit;
115static vfs_mount_t     udf_mount;
116static vfs_root_t      udf_root;
117static vfs_statfs_t    udf_statfs;
118static vfs_unmount_t   udf_unmount;
119static vfs_fhtovp_t	udf_fhtovp;
120
121static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *);
122
123static struct vfsops udf_vfsops = {
124	.vfs_fhtovp =		udf_fhtovp,
125	.vfs_init =		udf_init,
126	.vfs_mount =		udf_mount,
127	.vfs_root =		udf_root,
128	.vfs_statfs =		udf_statfs,
129	.vfs_uninit =		udf_uninit,
130	.vfs_unmount =		udf_unmount,
131	.vfs_vget =		udf_vget,
132};
133VFS_SET(udf_vfsops, udf, VFCF_READONLY);
134
135MODULE_VERSION(udf, 1);
136
137static int udf_mountfs(struct vnode *, struct mount *);
138
139static int
140udf_init(struct vfsconf *foo)
141{
142
143	udf_zone_trans = uma_zcreate("UDF translation buffer, zone", MAXNAMLEN *
144	    sizeof(unicode_t), NULL, NULL, NULL, NULL, 0, 0);
145
146	udf_zone_node = uma_zcreate("UDF Node zone", sizeof(struct udf_node),
147	    NULL, NULL, NULL, NULL, 0, 0);
148
149	udf_zone_ds = uma_zcreate("UDF Dirstream zone",
150	    sizeof(struct udf_dirstream), NULL, NULL, NULL, NULL, 0, 0);
151
152	return 0;
153}
154
155static int
156udf_uninit(struct vfsconf *foo)
157{
158
159	if (udf_zone_trans != NULL) {
160		uma_zdestroy(udf_zone_trans);
161		udf_zone_trans = NULL;
162	}
163
164	if (udf_zone_node != NULL) {
165		uma_zdestroy(udf_zone_node);
166		udf_zone_node = NULL;
167	}
168
169	if (udf_zone_ds != NULL) {
170		uma_zdestroy(udf_zone_ds);
171		udf_zone_ds = NULL;
172	}
173
174	return (0);
175}
176
177static int
178udf_mount(struct mount *mp)
179{
180	struct vnode *devvp;	/* vnode of the mount device */
181	struct thread *td;
182	struct udf_mnt *imp = NULL;
183	struct vfsoptlist *opts;
184	char *fspec, *cs_disk, *cs_local;
185	int error, len, *udf_flags;
186	struct nameidata nd, *ndp = &nd;
187
188	td = curthread;
189	opts = mp->mnt_optnew;
190
191	/*
192	 * Unconditionally mount as read-only.
193	 */
194	MNT_ILOCK(mp);
195	mp->mnt_flag |= MNT_RDONLY;
196	MNT_IUNLOCK(mp);
197
198	/*
199	 * No root filesystem support.  Probably not a big deal, since the
200	 * bootloader doesn't understand UDF.
201	 */
202	if (mp->mnt_flag & MNT_ROOTFS)
203		return (ENOTSUP);
204
205	fspec = NULL;
206	error = vfs_getopt(opts, "from", (void **)&fspec, &len);
207	if (!error && fspec[len - 1] != '\0')
208		return (EINVAL);
209
210	if (mp->mnt_flag & MNT_UPDATE) {
211		return (0);
212	}
213
214	/* Check that the mount device exists */
215	if (fspec == NULL)
216		return (EINVAL);
217	NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec);
218	if ((error = namei(ndp)))
219		return (error);
220	NDFREE_PNBUF(ndp);
221	devvp = ndp->ni_vp;
222
223	if (!vn_isdisk_error(devvp, &error)) {
224		vput(devvp);
225		return (error);
226	}
227
228	/* Check the access rights on the mount device */
229	error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td);
230	if (error)
231		error = priv_check(td, PRIV_VFS_MOUNT_PERM);
232	if (error) {
233		vput(devvp);
234		return (error);
235	}
236
237	if ((error = udf_mountfs(devvp, mp))) {
238		vrele(devvp);
239		return (error);
240	}
241
242	imp = VFSTOUDFFS(mp);
243
244	udf_flags = NULL;
245	error = vfs_getopt(opts, "flags", (void **)&udf_flags, &len);
246	if (error || len != sizeof(int))
247		return (EINVAL);
248	imp->im_flags = *udf_flags;
249
250	if (imp->im_flags & UDFMNT_KICONV && udf_iconv) {
251		cs_disk = NULL;
252		error = vfs_getopt(opts, "cs_disk", (void **)&cs_disk, &len);
253		if (!error && cs_disk[len - 1] != '\0')
254			return (EINVAL);
255		cs_local = NULL;
256		error = vfs_getopt(opts, "cs_local", (void **)&cs_local, &len);
257		if (!error && cs_local[len - 1] != '\0')
258			return (EINVAL);
259		udf_iconv->open(cs_local, cs_disk, &imp->im_d2l);
260#if 0
261		udf_iconv->open(cs_disk, cs_local, &imp->im_l2d);
262#endif
263	}
264
265	vfs_mountedfrom(mp, fspec);
266	return 0;
267};
268
269/*
270 * Check the descriptor tag for both the correct id and correct checksum.
271 * Return zero if all is good, EINVAL if not.
272 */
273int
274udf_checktag(struct desc_tag *tag, uint16_t id)
275{
276	uint8_t *itag;
277	uint8_t i, cksum = 0;
278
279	itag = (uint8_t *)tag;
280
281	if (le16toh(tag->id) != id)
282		return (EINVAL);
283
284	for (i = 0; i < 16; i++)
285		cksum = cksum + itag[i];
286	cksum = cksum - itag[4];
287
288	if (cksum == tag->cksum)
289		return (0);
290
291	return (EINVAL);
292}
293
294static int
295udf_mountfs(struct vnode *devvp, struct mount *mp)
296{
297	struct buf *bp = NULL;
298	struct cdev *dev;
299	struct anchor_vdp avdp;
300	struct udf_mnt *udfmp = NULL;
301	struct part_desc *pd;
302	struct logvol_desc *lvd;
303	struct fileset_desc *fsd;
304	struct file_entry *root_fentry;
305	uint32_t sector, size, mvds_start, mvds_end;
306	uint32_t logical_secsize;
307	uint32_t fsd_offset = 0;
308	uint16_t part_num = 0, fsd_part = 0;
309	int error = EINVAL;
310	int logvol_found = 0, part_found = 0, fsd_found = 0;
311	int bsize;
312	struct g_consumer *cp;
313	struct bufobj *bo;
314
315	dev = devvp->v_rdev;
316	dev_ref(dev);
317	g_topology_lock();
318	error = g_vfs_open(devvp, &cp, "udf", 0);
319	g_topology_unlock();
320	VOP_UNLOCK(devvp);
321	if (error)
322		goto bail;
323
324	bo = &devvp->v_bufobj;
325
326	if (devvp->v_rdev->si_iosize_max != 0)
327		mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
328	if (mp->mnt_iosize_max > maxphys)
329		mp->mnt_iosize_max = maxphys;
330
331	/* XXX: should be M_WAITOK */
332	udfmp = malloc(sizeof(struct udf_mnt), M_UDFMOUNT,
333	    M_NOWAIT | M_ZERO);
334	if (udfmp == NULL) {
335		printf("Cannot allocate UDF mount struct\n");
336		error = ENOMEM;
337		goto bail;
338	}
339
340	mp->mnt_data = udfmp;
341	mp->mnt_stat.f_fsid.val[0] = dev2udev(devvp->v_rdev);
342	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
343	MNT_ILOCK(mp);
344	mp->mnt_flag |= MNT_LOCAL;
345	mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED;
346	MNT_IUNLOCK(mp);
347	udfmp->im_mountp = mp;
348	udfmp->im_dev = dev;
349	udfmp->im_devvp = devvp;
350	udfmp->im_d2l = NULL;
351	udfmp->im_cp = cp;
352	udfmp->im_bo = bo;
353
354#if 0
355	udfmp->im_l2d = NULL;
356#endif
357	/*
358	 * The UDF specification defines a logical sectorsize of 2048
359	 * for DVD media.
360	 */
361	logical_secsize = 2048;
362
363	if (((logical_secsize % cp->provider->sectorsize) != 0) ||
364	    (logical_secsize < cp->provider->sectorsize)) {
365		error = EINVAL;
366		goto bail;
367	}
368
369	bsize = cp->provider->sectorsize;
370
371	/*
372	 * Get the Anchor Volume Descriptor Pointer from sector 256.
373	 * XXX Should also check sector n - 256, n, and 512.
374	 */
375	sector = 256;
376	if ((error = bread(devvp, sector * btodb(logical_secsize), bsize,
377			   NOCRED, &bp)) != 0)
378		goto bail;
379	if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR)))
380		goto bail;
381
382	bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp));
383	brelse(bp);
384	bp = NULL;
385
386	/*
387	 * Extract the Partition Descriptor and Logical Volume Descriptor
388	 * from the Volume Descriptor Sequence.
389	 * XXX Should we care about the partition type right now?
390	 * XXX What about multiple partitions?
391	 */
392	mvds_start = le32toh(avdp.main_vds_ex.loc);
393	mvds_end = mvds_start + (le32toh(avdp.main_vds_ex.len) - 1) / bsize;
394	for (sector = mvds_start; sector < mvds_end; sector++) {
395		if ((error = bread(devvp, sector * btodb(logical_secsize),
396				   bsize, NOCRED, &bp)) != 0) {
397			printf("Can't read sector %d of VDS\n", sector);
398			goto bail;
399		}
400		lvd = (struct logvol_desc *)bp->b_data;
401		if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) {
402			udfmp->bsize = le32toh(lvd->lb_size);
403			if (udfmp->bsize < 0 || udfmp->bsize > maxbcachebuf) {
404				printf("lvd block size %d\n", udfmp->bsize);
405				error = EINVAL;
406				goto bail;
407			}
408			udfmp->bmask = udfmp->bsize - 1;
409			udfmp->bshift = ffs(udfmp->bsize) - 1;
410			fsd_part = le16toh(lvd->_lvd_use.fsd_loc.loc.part_num);
411			fsd_offset = le32toh(lvd->_lvd_use.fsd_loc.loc.lb_num);
412			if (udf_find_partmaps(udfmp, lvd))
413				break;
414			logvol_found = 1;
415		}
416		pd = (struct part_desc *)bp->b_data;
417		if (!udf_checktag(&pd->tag, TAGID_PARTITION)) {
418			part_found = 1;
419			part_num = le16toh(pd->part_num);
420			udfmp->part_len = le32toh(pd->part_len);
421			udfmp->part_start = le32toh(pd->start_loc);
422		}
423
424		brelse(bp);
425		bp = NULL;
426		if ((part_found) && (logvol_found))
427			break;
428	}
429
430	if (!part_found || !logvol_found) {
431		error = EINVAL;
432		goto bail;
433	}
434
435	if (fsd_part != part_num) {
436		printf("FSD does not lie within the partition!\n");
437		error = EINVAL;
438		goto bail;
439	}
440
441	/*
442	 * Grab the Fileset Descriptor
443	 * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing
444	 * me in the right direction here.
445	 */
446	sector = udfmp->part_start + fsd_offset;
447	if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
448		printf("Cannot read sector %d of FSD\n", sector);
449		goto bail;
450	}
451	fsd = (struct fileset_desc *)bp->b_data;
452	if (!udf_checktag(&fsd->tag, TAGID_FSD)) {
453		fsd_found = 1;
454		bcopy(&fsd->rootdir_icb, &udfmp->root_icb,
455		    sizeof(struct long_ad));
456	}
457
458	brelse(bp);
459	bp = NULL;
460
461	if (!fsd_found) {
462		printf("Couldn't find the fsd\n");
463		error = EINVAL;
464		goto bail;
465	}
466
467	/*
468	 * Find the file entry for the root directory.
469	 */
470	sector = le32toh(udfmp->root_icb.loc.lb_num) + udfmp->part_start;
471	size = le32toh(udfmp->root_icb.len);
472	if (size < UDF_FENTRY_SIZE) {
473		printf("Invalid root directory file entry length %u\n",
474		    size);
475		goto bail;
476	}
477	if ((error = udf_readdevblks(udfmp, sector, size, &bp)) != 0) {
478		printf("Cannot read sector %d\n", sector);
479		goto bail;
480	}
481
482	root_fentry = (struct file_entry *)bp->b_data;
483	if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) {
484		printf("Invalid root file entry!\n");
485		goto bail;
486	}
487
488	brelse(bp);
489	bp = NULL;
490
491	return 0;
492
493bail:
494	if (udfmp != NULL)
495		free(udfmp, M_UDFMOUNT);
496	if (bp != NULL)
497		brelse(bp);
498	if (cp != NULL) {
499		g_topology_lock();
500		g_vfs_close(cp);
501		g_topology_unlock();
502	}
503	dev_rel(dev);
504	return error;
505};
506
507static int
508udf_unmount(struct mount *mp, int mntflags)
509{
510	struct udf_mnt *udfmp;
511	int error, flags = 0;
512
513	udfmp = VFSTOUDFFS(mp);
514
515	if (mntflags & MNT_FORCE)
516		flags |= FORCECLOSE;
517
518	if ((error = vflush(mp, 0, flags, curthread)))
519		return (error);
520
521	if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) {
522		if (udfmp->im_d2l)
523			udf_iconv->close(udfmp->im_d2l);
524#if 0
525		if (udfmp->im_l2d)
526			udf_iconv->close(udfmp->im_l2d);
527#endif
528	}
529
530	g_topology_lock();
531	g_vfs_close(udfmp->im_cp);
532	g_topology_unlock();
533	vrele(udfmp->im_devvp);
534	dev_rel(udfmp->im_dev);
535
536	if (udfmp->s_table != NULL)
537		free(udfmp->s_table, M_UDFMOUNT);
538
539	free(udfmp, M_UDFMOUNT);
540
541	mp->mnt_data = NULL;
542	return (0);
543}
544
545static int
546udf_root(struct mount *mp, int flags, struct vnode **vpp)
547{
548	struct udf_mnt *udfmp;
549	ino_t id;
550
551	udfmp = VFSTOUDFFS(mp);
552
553	id = udf_getid(&udfmp->root_icb);
554
555	return (udf_vget(mp, id, flags, vpp));
556}
557
558static int
559udf_statfs(struct mount *mp, struct statfs *sbp)
560{
561	struct udf_mnt *udfmp;
562
563	udfmp = VFSTOUDFFS(mp);
564
565	sbp->f_bsize = udfmp->bsize;
566	sbp->f_iosize = udfmp->bsize;
567	sbp->f_blocks = udfmp->part_len;
568	sbp->f_bfree = 0;
569	sbp->f_bavail = 0;
570	sbp->f_files = 0;
571	sbp->f_ffree = 0;
572	return 0;
573}
574
575int
576udf_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
577{
578	struct buf *bp;
579	struct vnode *devvp;
580	struct udf_mnt *udfmp;
581	struct thread *td;
582	struct vnode *vp;
583	struct udf_node *unode;
584	struct file_entry *fe;
585	uint32_t lea, lad;
586	int error, sector, size;
587
588	error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
589	if (error || *vpp != NULL)
590		return (error);
591
592	/*
593	 * We must promote to an exclusive lock for vnode creation.  This
594	 * can happen if lookup is passed LOCKSHARED.
595 	 */
596	if ((flags & LK_TYPE_MASK) == LK_SHARED) {
597		flags &= ~LK_TYPE_MASK;
598		flags |= LK_EXCLUSIVE;
599	}
600
601	/*
602	 * We do not lock vnode creation as it is believed to be too
603	 * expensive for such rare case as simultaneous creation of vnode
604	 * for same ino by different processes. We just allow them to race
605	 * and check later to decide who wins. Let the race begin!
606	 */
607
608	td = curthread;
609	udfmp = VFSTOUDFFS(mp);
610
611	unode = uma_zalloc(udf_zone_node, M_WAITOK | M_ZERO);
612
613	if ((error = udf_allocv(mp, &vp, td))) {
614		printf("Error from udf_allocv\n");
615		uma_zfree(udf_zone_node, unode);
616		return (error);
617	}
618
619	unode->i_vnode = vp;
620	unode->hash_id = ino;
621	unode->udfmp = udfmp;
622	vp->v_data = unode;
623
624	lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
625	error = insmntque(vp, mp);
626	if (error != 0) {
627		uma_zfree(udf_zone_node, unode);
628		return (error);
629	}
630	error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL);
631	if (error || *vpp != NULL)
632		return (error);
633
634	/*
635	 * Copy in the file entry.  Per the spec, the size can only be 1 block.
636	 */
637	sector = ino + udfmp->part_start;
638	devvp = udfmp->im_devvp;
639	if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) {
640		printf("Cannot read sector %d\n", sector);
641		goto error;
642	}
643
644	/*
645	 * File entry length validation.
646	 */
647	fe = (struct file_entry *)bp->b_data;
648	if (udf_checktag(&fe->tag, TAGID_FENTRY)) {
649		printf("Invalid file entry!\n");
650		error = ENOMEM;
651		goto error;
652	}
653	lea = le32toh(fe->l_ea);
654	lad = le32toh(fe->l_ad);
655	if (lea > udfmp->bsize || lad > udfmp->bsize) {
656		printf("Invalid EA and AD lengths %u, %u\n", lea, lad);
657		error = EIO;
658		goto error;
659	}
660	size = UDF_FENTRY_SIZE + lea + lad;
661	if (size > udfmp->bsize) {
662		printf("Invalid file entry size %u\n", size);
663		error = EIO;
664		goto error;
665	}
666
667	unode->fentry = malloc(size, M_UDFFENTRY, M_NOWAIT | M_ZERO);
668	if (unode->fentry == NULL) {
669		printf("Cannot allocate file entry block\n");
670		error = ENOMEM;
671		goto error;
672	}
673
674	bcopy(bp->b_data, unode->fentry, size);
675
676	brelse(bp);
677	bp = NULL;
678
679	switch (unode->fentry->icbtag.file_type) {
680	default:
681		vp->v_type = VBAD;
682		break;
683	case 4:
684		vp->v_type = VDIR;
685		break;
686	case 5:
687		vp->v_type = VREG;
688		break;
689	case 6:
690		vp->v_type = VBLK;
691		break;
692	case 7:
693		vp->v_type = VCHR;
694		break;
695	case 9:
696		vp->v_type = VFIFO;
697		vp->v_op = &udf_fifoops;
698		break;
699	case 10:
700		vp->v_type = VSOCK;
701		break;
702	case 12:
703		vp->v_type = VLNK;
704		break;
705	}
706
707	if (vp->v_type != VFIFO)
708		VN_LOCK_ASHARE(vp);
709
710	if (ino == udf_getid(&udfmp->root_icb))
711		vp->v_vflag |= VV_ROOT;
712
713	vn_set_state(vp, VSTATE_CONSTRUCTED);
714	*vpp = vp;
715
716	return (0);
717
718error:
719	vgone(vp);
720	vput(vp);
721	brelse(bp);
722	*vpp = NULL;
723	return (error);
724}
725
726static int
727udf_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
728{
729	struct ifid *ifhp;
730	struct vnode *nvp;
731	struct udf_node *np;
732	off_t fsize;
733	int error;
734
735	ifhp = (struct ifid *)fhp;
736
737	if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
738		*vpp = NULLVP;
739		return (error);
740	}
741
742	np = VTON(nvp);
743	fsize = le64toh(np->fentry->inf_len);
744
745	*vpp = nvp;
746	vnode_create_vobject(*vpp, fsize, curthread);
747	return (0);
748}
749
750static int
751udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd)
752{
753	struct part_map_spare *pms;
754	struct regid *pmap_id;
755	struct buf *bp;
756	unsigned char regid_id[UDF_REGID_ID_SIZE + 1];
757	int i, k, ptype, psize, error;
758	uint8_t *pmap = (uint8_t *) &lvd->maps[0];
759
760	for (i = 0; i < le32toh(lvd->n_pm); i++) {
761		ptype = pmap[0];
762		psize = pmap[1];
763		if (((ptype != 1) && (ptype != 2)) ||
764		    ((psize != UDF_PMAP_TYPE1_SIZE) &&
765		     (psize != UDF_PMAP_TYPE2_SIZE))) {
766			printf("Invalid partition map found\n");
767			return (1);
768		}
769
770		if (ptype == 1) {
771			/* Type 1 map.  We don't care */
772			pmap += UDF_PMAP_TYPE1_SIZE;
773			continue;
774		}
775
776		/* Type 2 map.  Gotta find out the details */
777		pmap_id = (struct regid *)&pmap[4];
778		bzero(&regid_id[0], UDF_REGID_ID_SIZE);
779		bcopy(&pmap_id->id[0], &regid_id[0], UDF_REGID_ID_SIZE);
780
781		if (bcmp(&regid_id[0], "*UDF Sparable Partition",
782		    UDF_REGID_ID_SIZE)) {
783			printf("Unsupported partition map: %s\n", &regid_id[0]);
784			return (1);
785		}
786
787		pms = (struct part_map_spare *)pmap;
788		pmap += UDF_PMAP_TYPE2_SIZE;
789		udfmp->s_table = malloc(le32toh(pms->st_size),
790		    M_UDFMOUNT, M_NOWAIT | M_ZERO);
791		if (udfmp->s_table == NULL)
792			return (ENOMEM);
793
794		/* Calculate the number of sectors per packet. */
795		/* XXX Logical or physical? */
796		udfmp->p_sectors = le16toh(pms->packet_len) / udfmp->bsize;
797
798		/*
799		 * XXX If reading the first Sparing Table fails, should look
800		 * for another table.
801		 */
802		if ((error = udf_readdevblks(udfmp, le32toh(pms->st_loc[0]),
803					   le32toh(pms->st_size), &bp)) != 0) {
804			if (bp != NULL)
805				brelse(bp);
806			printf("Failed to read Sparing Table at sector %d\n",
807			    le32toh(pms->st_loc[0]));
808			free(udfmp->s_table, M_UDFMOUNT);
809			return (error);
810		}
811		bcopy(bp->b_data, udfmp->s_table, le32toh(pms->st_size));
812		brelse(bp);
813
814		if (udf_checktag(&udfmp->s_table->tag, 0)) {
815			printf("Invalid sparing table found\n");
816			free(udfmp->s_table, M_UDFMOUNT);
817			return (EINVAL);
818		}
819
820		/* See how many valid entries there are here.  The list is
821		 * supposed to be sorted. 0xfffffff0 and higher are not valid
822		 */
823		for (k = 0; k < le16toh(udfmp->s_table->rt_l); k++) {
824			udfmp->s_table_entries = k;
825			if (le32toh(udfmp->s_table->entries[k].org) >=
826			    0xfffffff0)
827				break;
828		}
829	}
830
831	return (0);
832}
833