summaryrefslogtreecommitdiffstats
path: root/sys/fs/cd9660/cd9660_vfsops.c
blob: 58f2addc657bef44a8050baf9227c7b001427e80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
/*-
 * Copyright (c) 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai (amurai@spec.co.jp).
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)cd9660_vfsops.c	8.18 (Berkeley) 5/22/95
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/cdio.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/iconv.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/iso_rrip.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/cd9660_mount.h>

#include <geom/geom.h>
#include <geom/geom_vfs.h>

MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure");
MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part");

struct iconv_functions *cd9660_iconv = NULL;

static vfs_mount_t	cd9660_mount;
static vfs_cmount_t	cd9660_cmount;
static vfs_unmount_t	cd9660_unmount;
static vfs_root_t	cd9660_root;
static vfs_statfs_t	cd9660_statfs;
static vfs_vget_t	cd9660_vget;
static vfs_fhtovp_t	cd9660_fhtovp;
static vfs_vptofh_t	cd9660_vptofh;

static struct vfsops cd9660_vfsops = {
	.vfs_fhtovp =		cd9660_fhtovp,
	.vfs_mount =		cd9660_mount,
	.vfs_cmount =		cd9660_cmount,
	.vfs_root =		cd9660_root,
	.vfs_statfs =		cd9660_statfs,
	.vfs_unmount =		cd9660_unmount,
	.vfs_vget =		cd9660_vget,
	.vfs_vptofh =		cd9660_vptofh,
};
VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
MODULE_VERSION(cd9660, 1);

static int iso_mountfs(struct vnode *devvp, struct mount *mp,
		       struct thread *td);

/*
 * VFS Operations.
 */

static int
cd9660_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
{
	struct iso_args args;
	int error;

	error = copyin(data, &args, sizeof args);
	if (error)
		return (error);

	ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
	ma = mount_arg(ma, "export", &args.export, sizeof args.export);
	ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64);
	ma = mount_argsu(ma, "cs_local", args.cs_local, 64);
	ma = mount_argf(ma, "ssector", "%u", args.ssector);
	ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip");
	ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens");
	ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt");
	ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet");
	ma = mount_argb(ma,
	    args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet");
	ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv");

	error = kernel_mount(ma, flags);

	return (error);
}

static int
cd9660_mount(struct mount *mp, struct thread *td)
{
	struct vnode *devvp;
	char *fspec;
	int error;
	mode_t accessmode;
	struct nameidata ndp;
	struct iso_mnt *imp = 0;

	/*
	 * Unconditionally mount as read-only.
	 */
	MNT_ILOCK(mp);
	mp->mnt_flag |= MNT_RDONLY;
	MNT_IUNLOCK(mp);

	fspec = vfs_getopts(mp->mnt_optnew, "from", &error);
	if (error)
		return (error);

	imp = VFSTOISOFS(mp);

	if (mp->mnt_flag & MNT_UPDATE) {
		if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0))
			return (0);
	}
	/*
	 * Not an update, or updating the name: look up the name
	 * and verify that it refers to a sensible block device.
	 */
	NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, td);
	if ((error = namei(&ndp)))
		return (error);
	NDFREE(&ndp, NDF_ONLY_PNBUF);
	devvp = ndp.ni_vp;

	if (!vn_isdisk(devvp, &error)) {
		vrele(devvp);
		return (error);
	}

	/*
	 * Verify that user has necessary permissions on the device,
	 * or has superuser abilities
	 */
	accessmode = VREAD;
	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
	error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td);
	if (error)
		error = priv_check(td, PRIV_VFS_MOUNT_PERM);
	if (error) {
		vput(devvp);
		return (error);
	}
	VOP_UNLOCK(devvp, 0, td);

	if ((mp->mnt_flag & MNT_UPDATE) == 0) {
		error = iso_mountfs(devvp, mp, td);
	} else {
		if (devvp != imp->im_devvp)
			error = EINVAL;	/* needs translation */
		else
			vrele(devvp);
	}
	if (error) {
		vrele(devvp);
		return error;
	}
	vfs_mountedfrom(mp, fspec);
	return 0;
}

/*
 * Common code for mount and mountroot
 */
static int
iso_mountfs(devvp, mp, td)
	struct vnode *devvp;
	struct mount *mp;
	struct thread *td;
{
	struct iso_mnt *isomp = (struct iso_mnt *)0;
	struct buf *bp = NULL;
	struct buf *pribp = NULL, *supbp = NULL;
	struct cdev *dev = devvp->v_rdev;
	int error = EINVAL;
	int high_sierra = 0;
	int iso_bsize;
	int iso_blknum;
	int joliet_level;
	struct iso_volume_descriptor *vdp = 0;
	struct iso_primary_descriptor *pri = NULL;
	struct iso_sierra_primary_descriptor *pri_sierra = NULL;
	struct iso_supplementary_descriptor *sup = NULL;
	struct iso_directory_record *rootp;
	int logical_block_size, ssector;
	struct g_consumer *cp;
	struct bufobj *bo;
	char *cs_local, *cs_disk;

	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
	DROP_GIANT();
	g_topology_lock();
	error = g_vfs_open(devvp, &cp, "cd9660", 0);
	g_topology_unlock();
	PICKUP_GIANT();
	VOP_UNLOCK(devvp, 0, td);
	if (error)
		return error;
	if (devvp->v_rdev->si_iosize_max != 0)
		mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
	if (mp->mnt_iosize_max > MAXPHYS)
		mp->mnt_iosize_max = MAXPHYS;

	bo = &devvp->v_bufobj;
	bo->bo_private = cp;
	bo->bo_ops = g_vfs_bufops;

	/* This is the "logical sector size".  The standard says this
	 * should be 2048 or the physical sector size on the device,
	 * whichever is greater.
	 */
	if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) {
		DROP_GIANT();
		g_topology_lock();
		g_vfs_close(cp, td);
		g_topology_unlock();
                PICKUP_GIANT();
		return (EINVAL);
	}

	iso_bsize = cp->provider->sectorsize;

	joliet_level = 0;
	if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector))
		ssector = 0;
	for (iso_blknum = 16 + ssector;
	     iso_blknum < 100 + ssector;
	     iso_blknum++) {
		if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE),
				  iso_bsize, NOCRED, &bp)) != 0)
			goto out;

		vdp = (struct iso_volume_descriptor *)bp->b_data;
		if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
			if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
				  sizeof vdp->id) != 0) {
				error = EINVAL;
				goto out;
			} else
				high_sierra = 1;
		}
		switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
		case ISO_VD_PRIMARY:
			if (pribp == NULL) {
				pribp = bp;
				bp = NULL;
				pri = (struct iso_primary_descriptor *)vdp;
				pri_sierra =
				  (struct iso_sierra_primary_descriptor *)vdp;
			}
			break;

		case ISO_VD_SUPPLEMENTARY:
			if (supbp == NULL) {
				supbp = bp;
				bp = NULL;
				sup = (struct iso_supplementary_descriptor *)vdp;

				if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) {
					if (bcmp(sup->escape, "%/@", 3) == 0)
						joliet_level = 1;
					if (bcmp(sup->escape, "%/C", 3) == 0)
						joliet_level = 2;
					if (bcmp(sup->escape, "%/E", 3) == 0)
						joliet_level = 3;

					if ((isonum_711 (sup->flags) & 1) &&
					    !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0))
						joliet_level = 0;
				}
			}
			break;

		case ISO_VD_END:
			goto vd_end;

		default:
			break;
		}
		if (bp) {
			brelse(bp);
			bp = NULL;
		}
	}
 vd_end:
	if (bp) {
		brelse(bp);
		bp = NULL;
	}

	if (pri == NULL) {
		error = EINVAL;
		goto out;
	}

	logical_block_size =
		isonum_723 (high_sierra?
			    pri_sierra->logical_block_size:
			    pri->logical_block_size);

	if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
	    || (logical_block_size & (logical_block_size - 1)) != 0) {
		error = EINVAL;
		goto out;
	}

	rootp = (struct iso_directory_record *)
		(high_sierra?
		 pri_sierra->root_directory_record:
		 pri->root_directory_record);

	isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
	isomp->im_cp = cp;
	isomp->im_bo = bo;
	isomp->logical_block_size = logical_block_size;
	isomp->volume_space_size =
		isonum_733 (high_sierra?
			    pri_sierra->volume_space_size:
			    pri->volume_space_size);
	isomp->joliet_level = 0;
	/*
	 * Since an ISO9660 multi-session CD can also access previous
	 * sessions, we have to include them into the space consider-
	 * ations.  This doesn't yield a very accurate number since
	 * parts of the old sessions might be inaccessible now, but we
	 * can't do much better.  This is also important for the NFS
	 * filehandle validation.
	 */
	isomp->volume_space_size += ssector;
	bcopy (rootp, isomp->root, sizeof isomp->root);
	isomp->root_extent = isonum_733 (rootp->extent);
	isomp->root_size = isonum_733 (rootp->size);

	isomp->im_bmask = logical_block_size - 1;
	isomp->im_bshift = ffs(logical_block_size) - 1;

	pribp->b_flags |= B_AGE;
	brelse(pribp);
	pribp = NULL;

	mp->mnt_data = (qaddr_t)isomp;
	mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
	mp->mnt_maxsymlinklen = 0;
	MNT_ILOCK(mp);
	mp->mnt_flag |= MNT_LOCAL;
	MNT_IUNLOCK(mp);
	isomp->im_mountp = mp;
	isomp->im_dev = dev;
	isomp->im_devvp = devvp;

	vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP);
	vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS);
	vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT);
	vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET);
	vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV);

	/* Check the Rock Ridge Extension support */
	if (!(isomp->im_flags & ISOFSMNT_NORRIP)) {
		if ((error = bread(isomp->im_devvp,
				  (isomp->root_extent + isonum_711(rootp->ext_attr_length)) <<
				  (isomp->im_bshift - DEV_BSHIFT),
				  isomp->logical_block_size, NOCRED, &bp)) != 0)
		    goto out;

		rootp = (struct iso_directory_record *)bp->b_data;

		if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
		    isomp->im_flags |= ISOFSMNT_NORRIP;
		} else {
		    isomp->im_flags &= ~ISOFSMNT_GENS;
		}

		/*
		 * The contents are valid,
		 * but they will get reread as part of another vnode, so...
		 */
		bp->b_flags |= B_AGE;
		brelse(bp);
		bp = NULL;
	}

	if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
		cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error);
		if (error)
			goto out;
		cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error);
		if (error)
			goto out;
		cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
		cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
	} else {
		isomp->im_d2l = NULL;
		isomp->im_l2d = NULL;
	}

	if (high_sierra) {
		/* this effectively ignores all the mount flags */
		if (bootverbose)
			log(LOG_INFO, "cd9660: High Sierra Format\n");
		isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
	} else
		switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
		  default:
			  isomp->iso_ftype = ISO_FTYPE_DEFAULT;
			  break;
		  case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
			  isomp->iso_ftype = ISO_FTYPE_9660;
			  break;
		  case 0:
			  if (bootverbose)
			  	  log(LOG_INFO, "cd9660: RockRidge Extension\n");
			  isomp->iso_ftype = ISO_FTYPE_RRIP;
			  break;
		}

	/* Decide whether to use the Joliet descriptor */

	if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
		if (bootverbose)
			log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n",
			    joliet_level);
		rootp = (struct iso_directory_record *)
			sup->root_directory_record;
		bcopy (rootp, isomp->root, sizeof isomp->root);
		isomp->root_extent = isonum_733 (rootp->extent);
		isomp->root_size = isonum_733 (rootp->size);
		isomp->joliet_level = joliet_level;
		supbp->b_flags |= B_AGE;
	}

	if (supbp) {
		brelse(supbp);
		supbp = NULL;
	}

	return 0;
out:
	if (bp)
		brelse(bp);
	if (pribp)
		brelse(pribp);
	if (supbp)
		brelse(supbp);
	if (cp != NULL) {
		DROP_GIANT();
		g_topology_lock();
		g_vfs_close(cp, td);
		g_topology_unlock();
		PICKUP_GIANT();
	}
	if (isomp) {
		free((caddr_t)isomp, M_ISOFSMNT);
		mp->mnt_data = (qaddr_t)0;
	}
	return error;
}

/*
 * unmount system call
 */
static int
cd9660_unmount(mp, mntflags, td)
	struct mount *mp;
	int mntflags;
	struct thread *td;
{
	struct iso_mnt *isomp;
	int error, flags = 0;

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;
#if 0
	mntflushbuf(mp, 0);
	if (mntinvalbuf(mp))
		return EBUSY;
#endif
	if ((error = vflush(mp, 0, flags, td)))
		return (error);

	isomp = VFSTOISOFS(mp);

	if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
		if (isomp->im_d2l)
			cd9660_iconv->close(isomp->im_d2l);
		if (isomp->im_l2d)
			cd9660_iconv->close(isomp->im_l2d);
	}
	DROP_GIANT();
	g_topology_lock();
	g_vfs_close(isomp->im_cp, td);
	g_topology_unlock();
	PICKUP_GIANT();
	vrele(isomp->im_devvp);
	free((caddr_t)isomp, M_ISOFSMNT);
	mp->mnt_data = (qaddr_t)0;
	MNT_ILOCK(mp);
	mp->mnt_flag &= ~MNT_LOCAL;
	MNT_IUNLOCK(mp);
	return (error);
}

/*
 * Return root of a filesystem
 */
static int
cd9660_root(mp, flags, vpp, td)
	struct mount *mp;
	int flags;
	struct vnode **vpp;
	struct thread *td;
{
	struct iso_mnt *imp = VFSTOISOFS(mp);
	struct iso_directory_record *dp =
	    (struct iso_directory_record *)imp->root;
	ino_t ino = isodirino(dp, imp);

	/*
	 * With RRIP we must use the `.' entry of the root directory.
	 * Simply tell vget, that it's a relocated directory.
	 */
	return (cd9660_vget_internal(mp, ino, LK_EXCLUSIVE, vpp,
	    imp->iso_ftype == ISO_FTYPE_RRIP, dp));
}

/*
 * Get filesystem statistics.
 */
static int
cd9660_statfs(mp, sbp, td)
	struct mount *mp;
	struct statfs *sbp;
	struct thread *td;
{
	struct iso_mnt *isomp;

	isomp = VFSTOISOFS(mp);

	sbp->f_bsize = isomp->logical_block_size;
	sbp->f_iosize = sbp->f_bsize;	/* XXX */
	sbp->f_blocks = isomp->volume_space_size;
	sbp->f_bfree = 0; /* total free blocks */
	sbp->f_bavail = 0; /* blocks free for non superuser */
	sbp->f_files =	0; /* total files */
	sbp->f_ffree = 0; /* free file nodes */
	return 0;
}

/*
 * File handle to vnode
 *
 * Have to be really careful about stale file handles:
 * - check that the inode number is in range
 * - call iget() to get the locked inode
 * - check for an unallocated inode (i_mode == 0)
 * - check that the generation number matches
 */

struct ifid {
	u_short	ifid_len;
	u_short	ifid_pad;
	int	ifid_ino;
	long	ifid_start;
};

/* ARGSUSED */
static int
cd9660_fhtovp(mp, fhp, vpp)
	struct mount *mp;
	struct fid *fhp;
	struct vnode **vpp;
{
	struct ifid *ifhp = (struct ifid *)fhp;
	struct iso_node *ip;
	struct vnode *nvp;
	int error;

#ifdef	ISOFS_DBG
	printf("fhtovp: ino %d, start %ld\n",
	       ifhp->ifid_ino, ifhp->ifid_start);
#endif

	if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
		*vpp = NULLVP;
		return (error);
	}
	ip = VTOI(nvp);
	if (ip->inode.iso_mode == 0) {
		vput(nvp);
		*vpp = NULLVP;
		return (ESTALE);
	}
	*vpp = nvp;
	vnode_create_vobject(*vpp, ip->i_size, curthread);
	return (0);
}

static int
cd9660_vget(mp, ino, flags, vpp)
	struct mount *mp;
	ino_t ino;
	int flags;
	struct vnode **vpp;
{

	/*
	 * XXXX
	 * It would be nice if we didn't always set the `relocated' flag
	 * and force the extra read, but I don't want to think about fixing
	 * that right now.
	 */
	return (cd9660_vget_internal(mp, ino, flags, vpp,
#if 0
	    VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
#else
	    0,
#endif
	    (struct iso_directory_record *)0));
}

int
cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir)
	struct mount *mp;
	ino_t ino;
	int flags;
	struct vnode **vpp;
	int relocated;
	struct iso_directory_record *isodir;
{
	struct iso_mnt *imp;
	struct iso_node *ip;
	struct buf *bp;
	struct vnode *vp;
	struct cdev *dev;
	int error;

	error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL);
	if (error || *vpp != NULL)
		return (error);

	imp = VFSTOISOFS(mp);
	dev = imp->im_dev;

	/* Allocate a new vnode/iso_node. */
	if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) {
		*vpp = NULLVP;
		return (error);
	}
	MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE,
	    M_WAITOK | M_ZERO);
	vp->v_data = ip;
	ip->i_vnode = vp;
	ip->i_number = ino;

	error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL);
	if (error || *vpp != NULL)
		return (error);

	if (isodir == 0) {
		int lbn, off;

		lbn = lblkno(imp, ino);
		if (lbn >= imp->volume_space_size) {
			vput(vp);
			printf("fhtovp: lbn exceed volume space %d\n", lbn);
			return (ESTALE);
		}

		off = blkoff(imp, ino);
		if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
			vput(vp);
			printf("fhtovp: crosses block boundary %d\n",
			       off + ISO_DIRECTORY_RECORD_SIZE);
			return (ESTALE);
		}

		error = bread(imp->im_devvp,
			      lbn << (imp->im_bshift - DEV_BSHIFT),
			      imp->logical_block_size, NOCRED, &bp);
		if (error) {
			vput(vp);
			brelse(bp);
			printf("fhtovp: bread error %d\n",error);
			return (error);
		}
		isodir = (struct iso_directory_record *)(bp->b_data + off);

		if (off + isonum_711(isodir->length) >
		    imp->logical_block_size) {
			vput(vp);
			if (bp != 0)
				brelse(bp);
			printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n",
			       off +isonum_711(isodir->length), off,
			       isonum_711(isodir->length));
			return (ESTALE);
		}

#if 0
		if (isonum_733(isodir->extent) +
		    isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
			if (bp != 0)
				brelse(bp);
			printf("fhtovp: file start miss %d vs %d\n",
			       isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length),
			       ifhp->ifid_start);
			return (ESTALE);
		}
#endif
	} else
		bp = 0;

	ip->i_mnt = imp;
	VREF(imp->im_devvp);

	if (relocated) {
		/*
		 * On relocated directories we must
		 * read the `.' entry out of a dir.
		 */
		ip->iso_start = ino >> imp->im_bshift;
		if (bp != 0)
			brelse(bp);
		if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
			vput(vp);
			return (error);
		}
		isodir = (struct iso_directory_record *)bp->b_data;
	}

	ip->iso_extent = isonum_733(isodir->extent);
	ip->i_size = isonum_733(isodir->size);
	ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;

	/*
	 * Setup time stamp, attribute
	 */
	vp->v_type = VNON;
	switch (imp->iso_ftype) {
	default:	/* ISO_FTYPE_9660 */
	    {
		struct buf *bp2;
		int off;
		if ((imp->im_flags & ISOFSMNT_EXTATT)
		    && (off = isonum_711(isodir->ext_attr_length)))
			cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
				     &bp2);
		else
			bp2 = NULL;
		cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
		cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
		if (bp2)
			brelse(bp2);
		break;
	    }
	case ISO_FTYPE_RRIP:
		cd9660_rrip_analyze(isodir, ip, imp);
		break;
	}

	if (bp != 0)
		brelse(bp);

	/*
	 * Initialize the associated vnode
	 */
	switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
	case VFIFO:
		vp->v_op = &cd9660_fifoops;
		break;
	default:
		break;
	}

	if (ip->iso_extent == imp->root_extent)
		vp->v_vflag |= VV_ROOT;

	/*
	 * XXX need generation number?
	 */

	*vpp = vp;
	return (0);
}

/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
static int
cd9660_vptofh(vp, fhp)
	struct vnode *vp;
	struct fid *fhp;
{
	struct iso_node *ip = VTOI(vp);
	struct ifid *ifhp;

	ifhp = (struct ifid *)fhp;
	ifhp->ifid_len = sizeof(struct ifid);

	ifhp->ifid_ino = ip->i_number;
	ifhp->ifid_start = ip->iso_start;

#ifdef	ISOFS_DBG
	printf("vptofh: ino %d, start %ld\n",
	       ifhp->ifid_ino,ifhp->ifid_start);
#endif
	return 0;
}
OpenPOWER on IntegriCloud