xref: /openbmc/linux/fs/udf/super.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 /*
2  * super.c
3  *
4  * PURPOSE
5  *  Super block routines for the OSTA-UDF(tm) filesystem.
6  *
7  * DESCRIPTION
8  *  OSTA-UDF(tm) = Optical Storage Technology Association
9  *  Universal Disk Format.
10  *
11  *  This code is based on version 2.00 of the UDF specification,
12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13  *    http://www.osta.org/
14  *    http://www.ecma.ch/
15  *    http://www.iso.org/
16  *
17  * COPYRIGHT
18  *  This file is distributed under the terms of the GNU General Public
19  *  License (GPL). Copies of the GPL can be obtained from:
20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
21  *  Each contributing author retains all rights to their own work.
22  *
23  *  (C) 1998 Dave Boynton
24  *  (C) 1998-2004 Ben Fennema
25  *  (C) 2000 Stelias Computing Inc
26  *
27  * HISTORY
28  *
29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
30  *                added some debugging.
31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
32  *  10/16/98      attempting some multi-session support
33  *  10/17/98      added freespace count for "df"
34  *  11/11/98 gr   added novrs option
35  *  11/26/98 dgb  added fileset,anchor mount options
36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced vol descs
37  *                rewrote option handling based on isofs
38  *  12/20/98      find the free space bitmap (if it exists)
39  */
40 
41 #include "udfdecl.h"
42 
43 #include <linux/blkdev.h>
44 #include <linux/slab.h>
45 #include <linux/kernel.h>
46 #include <linux/module.h>
47 #include <linux/parser.h>
48 #include <linux/stat.h>
49 #include <linux/cdrom.h>
50 #include <linux/nls.h>
51 #include <linux/smp_lock.h>
52 #include <linux/buffer_head.h>
53 #include <linux/vfs.h>
54 #include <linux/vmalloc.h>
55 #include <asm/byteorder.h>
56 
57 #include <linux/udf_fs.h>
58 #include "udf_sb.h"
59 #include "udf_i.h"
60 
61 #include <linux/init.h>
62 #include <asm/uaccess.h>
63 
64 #define VDS_POS_PRIMARY_VOL_DESC	0
65 #define VDS_POS_UNALLOC_SPACE_DESC	1
66 #define VDS_POS_LOGICAL_VOL_DESC	2
67 #define VDS_POS_PARTITION_DESC		3
68 #define VDS_POS_IMP_USE_VOL_DESC	4
69 #define VDS_POS_VOL_DESC_PTR		5
70 #define VDS_POS_TERMINATING_DESC	6
71 #define VDS_POS_LENGTH			7
72 
73 static char error_buf[1024];
74 
75 /* These are the "meat" - everything else is stuffing */
76 static int udf_fill_super(struct super_block *, void *, int);
77 static void udf_put_super(struct super_block *);
78 static void udf_write_super(struct super_block *);
79 static int udf_remount_fs(struct super_block *, int *, char *);
80 static int udf_check_valid(struct super_block *, int, int);
81 static int udf_vrs(struct super_block *sb, int silent);
82 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
84 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
85 static void udf_find_anchor(struct super_block *);
86 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
87 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
88 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
89 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
90 static void udf_open_lvid(struct super_block *);
91 static void udf_close_lvid(struct super_block *);
92 static unsigned int udf_count_free(struct super_block *);
93 static int udf_statfs(struct dentry *, struct kstatfs *);
94 
95 /* UDF filesystem type */
96 static int udf_get_sb(struct file_system_type *fs_type,
97 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
98 {
99 	return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
100 }
101 
102 static struct file_system_type udf_fstype = {
103 	.owner		= THIS_MODULE,
104 	.name		= "udf",
105 	.get_sb		= udf_get_sb,
106 	.kill_sb	= kill_block_super,
107 	.fs_flags	= FS_REQUIRES_DEV,
108 };
109 
110 static struct kmem_cache * udf_inode_cachep;
111 
112 static struct inode *udf_alloc_inode(struct super_block *sb)
113 {
114 	struct udf_inode_info *ei;
115 	ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
116 	if (!ei)
117 		return NULL;
118 
119 	ei->i_unique = 0;
120 	ei->i_lenExtents = 0;
121 	ei->i_next_alloc_block = 0;
122 	ei->i_next_alloc_goal = 0;
123 	ei->i_strat4096 = 0;
124 
125 	return &ei->vfs_inode;
126 }
127 
128 static void udf_destroy_inode(struct inode *inode)
129 {
130 	kmem_cache_free(udf_inode_cachep, UDF_I(inode));
131 }
132 
133 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
134 {
135 	struct udf_inode_info *ei = (struct udf_inode_info *) foo;
136 
137 	if (flags & SLAB_CTOR_CONSTRUCTOR) {
138 		ei->i_ext.i_data = NULL;
139 		inode_init_once(&ei->vfs_inode);
140 	}
141 }
142 
143 static int init_inodecache(void)
144 {
145 	udf_inode_cachep = kmem_cache_create("udf_inode_cache",
146 					     sizeof(struct udf_inode_info),
147 					     0, (SLAB_RECLAIM_ACCOUNT|
148 						SLAB_MEM_SPREAD),
149 					     init_once, NULL);
150 	if (udf_inode_cachep == NULL)
151 		return -ENOMEM;
152 	return 0;
153 }
154 
155 static void destroy_inodecache(void)
156 {
157 	kmem_cache_destroy(udf_inode_cachep);
158 }
159 
160 /* Superblock operations */
161 static const struct super_operations udf_sb_ops = {
162 	.alloc_inode		= udf_alloc_inode,
163 	.destroy_inode		= udf_destroy_inode,
164 	.write_inode		= udf_write_inode,
165 	.delete_inode		= udf_delete_inode,
166 	.clear_inode		= udf_clear_inode,
167 	.put_super		= udf_put_super,
168 	.write_super		= udf_write_super,
169 	.statfs			= udf_statfs,
170 	.remount_fs		= udf_remount_fs,
171 };
172 
173 struct udf_options
174 {
175 	unsigned char novrs;
176 	unsigned int blocksize;
177 	unsigned int session;
178 	unsigned int lastblock;
179 	unsigned int anchor;
180 	unsigned int volume;
181 	unsigned short partition;
182 	unsigned int fileset;
183 	unsigned int rootdir;
184 	unsigned int flags;
185 	mode_t umask;
186 	gid_t gid;
187 	uid_t uid;
188 	struct nls_table *nls_map;
189 };
190 
191 static int __init init_udf_fs(void)
192 {
193 	int err;
194 	err = init_inodecache();
195 	if (err)
196 		goto out1;
197 	err = register_filesystem(&udf_fstype);
198 	if (err)
199 		goto out;
200 	return 0;
201 out:
202 	destroy_inodecache();
203 out1:
204 	return err;
205 }
206 
207 static void __exit exit_udf_fs(void)
208 {
209 	unregister_filesystem(&udf_fstype);
210 	destroy_inodecache();
211 }
212 
213 module_init(init_udf_fs)
214 module_exit(exit_udf_fs)
215 
216 /*
217  * udf_parse_options
218  *
219  * PURPOSE
220  *	Parse mount options.
221  *
222  * DESCRIPTION
223  *	The following mount options are supported:
224  *
225  *	gid=		Set the default group.
226  *	umask=		Set the default umask.
227  *	uid=		Set the default user.
228  *	bs=		Set the block size.
229  *	unhide		Show otherwise hidden files.
230  *	undelete	Show deleted files in lists.
231  *	adinicb		Embed data in the inode (default)
232  *	noadinicb	Don't embed data in the inode
233  *	shortad		Use short ad's
234  *	longad		Use long ad's (default)
235  *	nostrict	Unset strict conformance
236  *	iocharset=	Set the NLS character set
237  *
238  *	The remaining are for debugging and disaster recovery:
239  *
240  *	novrs		Skip volume sequence recognition
241  *
242  *	The following expect a offset from 0.
243  *
244  *	session=	Set the CDROM session (default= last session)
245  *	anchor=		Override standard anchor location. (default= 256)
246  *	volume=		Override the VolumeDesc location. (unused)
247  *	partition=	Override the PartitionDesc location. (unused)
248  *	lastblock=	Set the last block of the filesystem/
249  *
250  *	The following expect a offset from the partition root.
251  *
252  *	fileset=	Override the fileset block location. (unused)
253  *	rootdir=	Override the root directory location. (unused)
254  *		WARNING: overriding the rootdir to a non-directory may
255  *		yield highly unpredictable results.
256  *
257  * PRE-CONDITIONS
258  *	options		Pointer to mount options string.
259  *	uopts		Pointer to mount options variable.
260  *
261  * POST-CONDITIONS
262  *	<return>	1	Mount options parsed okay.
263  *	<return>	0	Error parsing mount options.
264  *
265  * HISTORY
266  *	July 1, 1997 - Andrew E. Mileski
267  *	Written, tested, and released.
268  */
269 
270 enum {
271 	Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
272 	Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
273 	Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
274 	Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
275 	Opt_rootdir, Opt_utf8, Opt_iocharset,
276 	Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
277 };
278 
279 static match_table_t tokens = {
280 	{Opt_novrs, "novrs"},
281 	{Opt_nostrict, "nostrict"},
282 	{Opt_bs, "bs=%u"},
283 	{Opt_unhide, "unhide"},
284 	{Opt_undelete, "undelete"},
285 	{Opt_noadinicb, "noadinicb"},
286 	{Opt_adinicb, "adinicb"},
287 	{Opt_shortad, "shortad"},
288 	{Opt_longad, "longad"},
289 	{Opt_uforget, "uid=forget"},
290 	{Opt_uignore, "uid=ignore"},
291 	{Opt_gforget, "gid=forget"},
292 	{Opt_gignore, "gid=ignore"},
293 	{Opt_gid, "gid=%u"},
294 	{Opt_uid, "uid=%u"},
295 	{Opt_umask, "umask=%o"},
296 	{Opt_session, "session=%u"},
297 	{Opt_lastblock, "lastblock=%u"},
298 	{Opt_anchor, "anchor=%u"},
299 	{Opt_volume, "volume=%u"},
300 	{Opt_partition, "partition=%u"},
301 	{Opt_fileset, "fileset=%u"},
302 	{Opt_rootdir, "rootdir=%u"},
303 	{Opt_utf8, "utf8"},
304 	{Opt_iocharset, "iocharset=%s"},
305 	{Opt_err, NULL}
306 };
307 
308 static int
309 udf_parse_options(char *options, struct udf_options *uopt)
310 {
311 	char *p;
312 	int option;
313 
314 	uopt->novrs = 0;
315 	uopt->blocksize = 2048;
316 	uopt->partition = 0xFFFF;
317 	uopt->session = 0xFFFFFFFF;
318 	uopt->lastblock = 0;
319 	uopt->anchor = 0;
320 	uopt->volume = 0xFFFFFFFF;
321 	uopt->rootdir = 0xFFFFFFFF;
322 	uopt->fileset = 0xFFFFFFFF;
323 	uopt->nls_map = NULL;
324 
325 	if (!options)
326 		return 1;
327 
328 	while ((p = strsep(&options, ",")) != NULL)
329 	{
330 		substring_t args[MAX_OPT_ARGS];
331 		int token;
332 		if (!*p)
333 			continue;
334 
335 		token = match_token(p, tokens, args);
336 		switch (token)
337 		{
338 			case Opt_novrs:
339 				uopt->novrs = 1;
340 			case Opt_bs:
341 				if (match_int(&args[0], &option))
342 					return 0;
343 				uopt->blocksize = option;
344 				break;
345 			case Opt_unhide:
346 				uopt->flags |= (1 << UDF_FLAG_UNHIDE);
347 				break;
348 			case Opt_undelete:
349 				uopt->flags |= (1 << UDF_FLAG_UNDELETE);
350 				break;
351 			case Opt_noadinicb:
352 				uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
353 				break;
354 			case Opt_adinicb:
355 				uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
356 				break;
357 			case Opt_shortad:
358 				uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
359 				break;
360 			case Opt_longad:
361 				uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
362 				break;
363 			case Opt_gid:
364 				if (match_int(args, &option))
365 					return 0;
366 				uopt->gid = option;
367 				break;
368 			case Opt_uid:
369 				if (match_int(args, &option))
370 					return 0;
371 				uopt->uid = option;
372 				break;
373 			case Opt_umask:
374 				if (match_octal(args, &option))
375 					return 0;
376 				uopt->umask = option;
377 				break;
378 			case Opt_nostrict:
379 				uopt->flags &= ~(1 << UDF_FLAG_STRICT);
380 				break;
381 			case Opt_session:
382 				if (match_int(args, &option))
383 					return 0;
384 				uopt->session = option;
385 				break;
386 			case Opt_lastblock:
387 				if (match_int(args, &option))
388 					return 0;
389 				uopt->lastblock = option;
390 				break;
391 			case Opt_anchor:
392 				if (match_int(args, &option))
393 					return 0;
394 				uopt->anchor = option;
395 				break;
396 			case Opt_volume:
397 				if (match_int(args, &option))
398 					return 0;
399 				uopt->volume = option;
400 				break;
401 			case Opt_partition:
402 				if (match_int(args, &option))
403 					return 0;
404 				uopt->partition = option;
405 				break;
406 			case Opt_fileset:
407 				if (match_int(args, &option))
408 					return 0;
409 				uopt->fileset = option;
410 				break;
411 			case Opt_rootdir:
412 				if (match_int(args, &option))
413 					return 0;
414 				uopt->rootdir = option;
415 				break;
416 			case Opt_utf8:
417 				uopt->flags |= (1 << UDF_FLAG_UTF8);
418 				break;
419 #ifdef CONFIG_UDF_NLS
420 			case Opt_iocharset:
421 				uopt->nls_map = load_nls(args[0].from);
422 				uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
423 				break;
424 #endif
425 			case Opt_uignore:
426 				uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
427 				break;
428 			case Opt_uforget:
429 				uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
430 				break;
431 			case Opt_gignore:
432 			    uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
433 				break;
434 			case Opt_gforget:
435 			    uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
436 				break;
437 			default:
438 				printk(KERN_ERR "udf: bad mount option \"%s\" "
439 						"or missing value\n", p);
440 			return 0;
441 		}
442 	}
443 	return 1;
444 }
445 
446 void
447 udf_write_super(struct super_block *sb)
448 {
449 	lock_kernel();
450 	if (!(sb->s_flags & MS_RDONLY))
451 		udf_open_lvid(sb);
452 	sb->s_dirt = 0;
453 	unlock_kernel();
454 }
455 
456 static int
457 udf_remount_fs(struct super_block *sb, int *flags, char *options)
458 {
459 	struct udf_options uopt;
460 
461 	uopt.flags = UDF_SB(sb)->s_flags ;
462 	uopt.uid   = UDF_SB(sb)->s_uid ;
463 	uopt.gid   = UDF_SB(sb)->s_gid ;
464 	uopt.umask = UDF_SB(sb)->s_umask ;
465 
466 	if ( !udf_parse_options(options, &uopt) )
467 		return -EINVAL;
468 
469 	UDF_SB(sb)->s_flags = uopt.flags;
470 	UDF_SB(sb)->s_uid   = uopt.uid;
471 	UDF_SB(sb)->s_gid   = uopt.gid;
472 	UDF_SB(sb)->s_umask = uopt.umask;
473 
474 	if (UDF_SB_LVIDBH(sb)) {
475 		int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
476 		if (write_rev > UDF_MAX_WRITE_VERSION)
477 			*flags |= MS_RDONLY;
478 	}
479 
480 	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
481 		return 0;
482 	if (*flags & MS_RDONLY)
483 		udf_close_lvid(sb);
484 	else
485 		udf_open_lvid(sb);
486 
487 	return 0;
488 }
489 
490 /*
491  * udf_set_blocksize
492  *
493  * PURPOSE
494  *	Set the block size to be used in all transfers.
495  *
496  * DESCRIPTION
497  *	To allow room for a DMA transfer, it is best to guess big when unsure.
498  *	This routine picks 2048 bytes as the blocksize when guessing. This
499  *	should be adequate until devices with larger block sizes become common.
500  *
501  *	Note that the Linux kernel can currently only deal with blocksizes of
502  *	512, 1024, 2048, 4096, and 8192 bytes.
503  *
504  * PRE-CONDITIONS
505  *	sb			Pointer to _locked_ superblock.
506  *
507  * POST-CONDITIONS
508  *	sb->s_blocksize		Blocksize.
509  *	sb->s_blocksize_bits	log2 of blocksize.
510  *	<return>	0	Blocksize is valid.
511  *	<return>	1	Blocksize is invalid.
512  *
513  * HISTORY
514  *	July 1, 1997 - Andrew E. Mileski
515  *	Written, tested, and released.
516  */
517 static  int
518 udf_set_blocksize(struct super_block *sb, int bsize)
519 {
520 	if (!sb_min_blocksize(sb, bsize)) {
521 		udf_debug("Bad block size (%d)\n", bsize);
522 		printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
523 		return 0;
524 	}
525 	return sb->s_blocksize;
526 }
527 
528 static int
529 udf_vrs(struct super_block *sb, int silent)
530 {
531 	struct volStructDesc *vsd = NULL;
532 	int sector = 32768;
533 	int sectorsize;
534 	struct buffer_head *bh = NULL;
535 	int iso9660=0;
536 	int nsr02=0;
537 	int nsr03=0;
538 
539 	/* Block size must be a multiple of 512 */
540 	if (sb->s_blocksize & 511)
541 		return 0;
542 
543 	if (sb->s_blocksize < sizeof(struct volStructDesc))
544 		sectorsize = sizeof(struct volStructDesc);
545 	else
546 		sectorsize = sb->s_blocksize;
547 
548 	sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
549 
550 	udf_debug("Starting at sector %u (%ld byte sectors)\n",
551 		(sector >> sb->s_blocksize_bits), sb->s_blocksize);
552 	/* Process the sequence (if applicable) */
553 	for (;!nsr02 && !nsr03; sector += sectorsize)
554 	{
555 		/* Read a block */
556 		bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
557 		if (!bh)
558 			break;
559 
560 		/* Look for ISO  descriptors */
561 		vsd = (struct volStructDesc *)(bh->b_data +
562 			(sector & (sb->s_blocksize - 1)));
563 
564 		if (vsd->stdIdent[0] == 0)
565 		{
566 			brelse(bh);
567 			break;
568 		}
569 		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
570 		{
571 			iso9660 = sector;
572 			switch (vsd->structType)
573 			{
574 				case 0:
575 					udf_debug("ISO9660 Boot Record found\n");
576 					break;
577 				case 1:
578 					udf_debug("ISO9660 Primary Volume Descriptor found\n");
579 					break;
580 				case 2:
581 					udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
582 					break;
583 				case 3:
584 					udf_debug("ISO9660 Volume Partition Descriptor found\n");
585 					break;
586 				case 255:
587 					udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
588 					break;
589 				default:
590 					udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
591 					break;
592 			}
593 		}
594 		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
595 		{
596 		}
597 		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
598 		{
599 			brelse(bh);
600 			break;
601 		}
602 		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
603 		{
604 			nsr02 = sector;
605 		}
606 		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
607 		{
608 			nsr03 = sector;
609 		}
610 		brelse(bh);
611 	}
612 
613 	if (nsr03)
614 		return nsr03;
615 	else if (nsr02)
616 		return nsr02;
617 	else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
618 		return -1;
619 	else
620 		return 0;
621 }
622 
623 /*
624  * udf_find_anchor
625  *
626  * PURPOSE
627  *	Find an anchor volume descriptor.
628  *
629  * PRE-CONDITIONS
630  *	sb			Pointer to _locked_ superblock.
631  *	lastblock		Last block on media.
632  *
633  * POST-CONDITIONS
634  *	<return>		1 if not found, 0 if ok
635  *
636  * HISTORY
637  *	July 1, 1997 - Andrew E. Mileski
638  *	Written, tested, and released.
639  */
640 static void
641 udf_find_anchor(struct super_block *sb)
642 {
643 	int lastblock = UDF_SB_LASTBLOCK(sb);
644 	struct buffer_head *bh = NULL;
645 	uint16_t ident;
646 	uint32_t location;
647 	int i;
648 
649 	if (lastblock)
650 	{
651 		int varlastblock = udf_variable_to_fixed(lastblock);
652 		int last[] =  { lastblock, lastblock - 2,
653 				lastblock - 150, lastblock - 152,
654 				varlastblock, varlastblock - 2,
655 				varlastblock - 150, varlastblock - 152 };
656 
657 		lastblock = 0;
658 
659 		/* Search for an anchor volume descriptor pointer */
660 
661 		/*  according to spec, anchor is in either:
662 		 *     block 256
663 		 *     lastblock-256
664 		 *     lastblock
665 		 *  however, if the disc isn't closed, it could be 512 */
666 
667 		for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
668 			if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
669 			{
670 				ident = location = 0;
671 			}
672 			else
673 			{
674 				ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
675 				location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
676 				brelse(bh);
677 			}
678 
679 			if (ident == TAG_IDENT_AVDP)
680 			{
681 				if (location == last[i] - UDF_SB_SESSION(sb))
682 				{
683 					lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
684 					UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
685 				}
686 				else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
687 				{
688 					UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
689 					lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
690 					UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
691 				}
692 				else
693 					udf_debug("Anchor found at block %d, location mismatch %d.\n",
694 						last[i], location);
695 			}
696 			else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
697 			{
698 				lastblock = last[i];
699 				UDF_SB_ANCHOR(sb)[3] = 512;
700 			}
701 			else
702 			{
703 				if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
704 				{
705 					ident = location = 0;
706 				}
707 				else
708 				{
709 					ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
710 					location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
711 					brelse(bh);
712 				}
713 
714 				if (ident == TAG_IDENT_AVDP &&
715 					location == last[i] - 256 - UDF_SB_SESSION(sb))
716 				{
717 					lastblock = last[i];
718 					UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
719 				}
720 				else
721 				{
722 					if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
723 					{
724 						ident = location = 0;
725 					}
726 					else
727 					{
728 						ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
729 						location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
730 						brelse(bh);
731 					}
732 
733 					if (ident == TAG_IDENT_AVDP &&
734 						location == udf_variable_to_fixed(last[i]) - 256)
735 					{
736 						UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
737 						lastblock = udf_variable_to_fixed(last[i]);
738 						UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
739 					}
740 				}
741 			}
742 		}
743 	}
744 
745 	if (!lastblock)
746 	{
747 		/* We havn't found the lastblock. check 312 */
748 		if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
749 		{
750 			ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
751 			location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
752 			brelse(bh);
753 
754 			if (ident == TAG_IDENT_AVDP && location == 256)
755 				UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
756 		}
757 	}
758 
759 	for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
760 		if (UDF_SB_ANCHOR(sb)[i])
761 		{
762 			if (!(bh = udf_read_tagged(sb,
763 				UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
764 			{
765 				UDF_SB_ANCHOR(sb)[i] = 0;
766 			}
767 			else
768 			{
769 				brelse(bh);
770 				if ((ident != TAG_IDENT_AVDP) && (i ||
771 					(ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
772 				{
773 					UDF_SB_ANCHOR(sb)[i] = 0;
774 				}
775 			}
776 		}
777 	}
778 
779 	UDF_SB_LASTBLOCK(sb) = lastblock;
780 }
781 
782 static int
783 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
784 {
785 	struct buffer_head *bh = NULL;
786 	long lastblock;
787 	uint16_t ident;
788 
789 	if (fileset->logicalBlockNum != 0xFFFFFFFF ||
790 		fileset->partitionReferenceNum != 0xFFFF)
791 	{
792 		bh = udf_read_ptagged(sb, *fileset, 0, &ident);
793 
794 		if (!bh)
795 			return 1;
796 		else if (ident != TAG_IDENT_FSD)
797 		{
798 			brelse(bh);
799 			return 1;
800 		}
801 
802 	}
803 
804 	if (!bh) /* Search backwards through the partitions */
805 	{
806 		kernel_lb_addr newfileset;
807 
808 		return 1;
809 
810 		for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
811 			(newfileset.partitionReferenceNum != 0xFFFF &&
812 				fileset->logicalBlockNum == 0xFFFFFFFF &&
813 				fileset->partitionReferenceNum == 0xFFFF);
814 			newfileset.partitionReferenceNum--)
815 		{
816 			lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
817 			newfileset.logicalBlockNum = 0;
818 
819 			do
820 			{
821 				bh = udf_read_ptagged(sb, newfileset, 0, &ident);
822 				if (!bh)
823 				{
824 					newfileset.logicalBlockNum ++;
825 					continue;
826 				}
827 
828 				switch (ident)
829 				{
830 					case TAG_IDENT_SBD:
831 					{
832 						struct spaceBitmapDesc *sp;
833 						sp = (struct spaceBitmapDesc *)bh->b_data;
834 						newfileset.logicalBlockNum += 1 +
835 							((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
836 								>> sb->s_blocksize_bits);
837 						brelse(bh);
838 						break;
839 					}
840 					case TAG_IDENT_FSD:
841 					{
842 						*fileset = newfileset;
843 						break;
844 					}
845 					default:
846 					{
847 						newfileset.logicalBlockNum ++;
848 						brelse(bh);
849 						bh = NULL;
850 						break;
851 					}
852 				}
853 			}
854 			while (newfileset.logicalBlockNum < lastblock &&
855 				fileset->logicalBlockNum == 0xFFFFFFFF &&
856 				fileset->partitionReferenceNum == 0xFFFF);
857 		}
858 	}
859 
860 	if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
861 		fileset->partitionReferenceNum != 0xFFFF) && bh)
862 	{
863 		udf_debug("Fileset at block=%d, partition=%d\n",
864 			fileset->logicalBlockNum, fileset->partitionReferenceNum);
865 
866 		UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
867 		udf_load_fileset(sb, bh, root);
868 		brelse(bh);
869 		return 0;
870 	}
871 	return 1;
872 }
873 
874 static void
875 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
876 {
877 	struct primaryVolDesc *pvoldesc;
878 	time_t recording;
879 	long recording_usec;
880 	struct ustr instr;
881 	struct ustr outstr;
882 
883 	pvoldesc = (struct primaryVolDesc *)bh->b_data;
884 
885 	if ( udf_stamp_to_time(&recording, &recording_usec,
886 		lets_to_cpu(pvoldesc->recordingDateAndTime)) )
887 	{
888 		kernel_timestamp ts;
889 		ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
890 		udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
891 			recording, recording_usec,
892 			ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
893 		UDF_SB_RECORDTIME(sb).tv_sec = recording;
894 		UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
895 	}
896 
897 	if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
898 	{
899 		if (udf_CS0toUTF8(&outstr, &instr))
900 		{
901 			strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
902 				outstr.u_len > 31 ? 31 : outstr.u_len);
903 			udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
904 		}
905 	}
906 
907 	if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
908 	{
909 		if (udf_CS0toUTF8(&outstr, &instr))
910 			udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
911 	}
912 }
913 
914 static void
915 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
916 {
917 	struct fileSetDesc *fset;
918 
919 	fset = (struct fileSetDesc *)bh->b_data;
920 
921 	*root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
922 
923 	UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
924 
925 	udf_debug("Rootdir at block=%d, partition=%d\n",
926 		root->logicalBlockNum, root->partitionReferenceNum);
927 }
928 
929 static void
930 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
931 {
932 	struct partitionDesc *p;
933 	int i;
934 
935 	p = (struct partitionDesc *)bh->b_data;
936 
937 	for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
938 	{
939 		udf_debug("Searching map: (%d == %d)\n",
940 			UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
941 		if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
942 		{
943 			UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
944 			UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
945 			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
946 				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
947 			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
948 				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
949 			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
950 				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
951 			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
952 				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
953 
954 			if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
955 				!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
956 			{
957 				struct partitionHeaderDesc *phd;
958 
959 				phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
960 				if (phd->unallocSpaceTable.extLength)
961 				{
962 					kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
963 
964 					UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
965 						udf_iget(sb, loc);
966 					UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
967 					udf_debug("unallocSpaceTable (part %d) @ %ld\n",
968 						i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
969 				}
970 				if (phd->unallocSpaceBitmap.extLength)
971 				{
972 					UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
973 					if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
974 					{
975 						UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
976 							le32_to_cpu(phd->unallocSpaceBitmap.extLength);
977 						UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
978 							le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
979 						UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
980 						udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
981 							i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
982 					}
983 				}
984 				if (phd->partitionIntegrityTable.extLength)
985 					udf_debug("partitionIntegrityTable (part %d)\n", i);
986 				if (phd->freedSpaceTable.extLength)
987 				{
988 					kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
989 
990 					UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
991 						udf_iget(sb, loc);
992 					UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
993 					udf_debug("freedSpaceTable (part %d) @ %ld\n",
994 						i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
995 				}
996 				if (phd->freedSpaceBitmap.extLength)
997 				{
998 					UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
999 					if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
1000 					{
1001 						UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1002 							le32_to_cpu(phd->freedSpaceBitmap.extLength);
1003 						UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1004 							le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1005 						UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1006 						udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1007 							i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1008 					}
1009 				}
1010 			}
1011 			break;
1012 		}
1013 	}
1014 	if (i == UDF_SB_NUMPARTS(sb))
1015 	{
1016 		udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1017 	}
1018 	else
1019 	{
1020 		udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1021 			le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1022 			UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1023 	}
1024 }
1025 
1026 static int
1027 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1028 {
1029 	struct logicalVolDesc *lvd;
1030 	int i, j, offset;
1031 	uint8_t type;
1032 
1033 	lvd = (struct logicalVolDesc *)bh->b_data;
1034 
1035 	UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1036 
1037 	for (i=0,offset=0;
1038 		 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1039 		 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1040 	{
1041 		type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1042 		if (type == 1)
1043 		{
1044 			struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1045 			UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1046 			UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1047 			UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1048 			UDF_SB_PARTFUNC(sb,i) = NULL;
1049 		}
1050 		else if (type == 2)
1051 		{
1052 			struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1053 			if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1054 			{
1055 				if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1056 				{
1057 					UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1058 					UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1059 				}
1060 				else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1061 				{
1062 					UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1063 					UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1064 				}
1065 			}
1066 			else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1067 			{
1068 				uint32_t loc;
1069 				uint16_t ident;
1070 				struct sparingTable *st;
1071 				struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1072 
1073 				UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1074 				UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1075 				for (j=0; j<spm->numSparingTables; j++)
1076 				{
1077 					loc = le32_to_cpu(spm->locSparingTable[j]);
1078 					UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1079 						udf_read_tagged(sb, loc, loc, &ident);
1080 					if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1081 					{
1082 						st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1083 						if (ident != 0 ||
1084 							strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1085 						{
1086 							brelse(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1087 							UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1088 						}
1089 					}
1090 				}
1091 				UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1092 			}
1093 			else
1094 			{
1095 				udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1096 				continue;
1097 			}
1098 			UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1099 			UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1100 		}
1101 		udf_debug("Partition (%d:%d) type %d on volume %d\n",
1102 			i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1103 	}
1104 
1105 	if (fileset)
1106 	{
1107 		long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1108 
1109 		*fileset = lelb_to_cpu(la->extLocation);
1110 		udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1111 			fileset->logicalBlockNum,
1112 			fileset->partitionReferenceNum);
1113 	}
1114 	if (lvd->integritySeqExt.extLength)
1115 		udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1116 	return 0;
1117 }
1118 
1119 /*
1120  * udf_load_logicalvolint
1121  *
1122  */
1123 static void
1124 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1125 {
1126 	struct buffer_head *bh = NULL;
1127 	uint16_t ident;
1128 
1129 	while (loc.extLength > 0 &&
1130 		(bh = udf_read_tagged(sb, loc.extLocation,
1131 			loc.extLocation, &ident)) &&
1132 		ident == TAG_IDENT_LVID)
1133 	{
1134 		UDF_SB_LVIDBH(sb) = bh;
1135 
1136 		if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1137 			udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1138 
1139 		if (UDF_SB_LVIDBH(sb) != bh)
1140 			brelse(bh);
1141 		loc.extLength -= sb->s_blocksize;
1142 		loc.extLocation ++;
1143 	}
1144 	if (UDF_SB_LVIDBH(sb) != bh)
1145 		brelse(bh);
1146 }
1147 
1148 /*
1149  * udf_process_sequence
1150  *
1151  * PURPOSE
1152  *	Process a main/reserve volume descriptor sequence.
1153  *
1154  * PRE-CONDITIONS
1155  *	sb			Pointer to _locked_ superblock.
1156  *	block			First block of first extent of the sequence.
1157  *	lastblock		Lastblock of first extent of the sequence.
1158  *
1159  * HISTORY
1160  *	July 1, 1997 - Andrew E. Mileski
1161  *	Written, tested, and released.
1162  */
1163 static  int
1164 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1165 {
1166 	struct buffer_head *bh = NULL;
1167 	struct udf_vds_record vds[VDS_POS_LENGTH];
1168 	struct generic_desc *gd;
1169 	struct volDescPtr *vdp;
1170 	int done=0;
1171 	int i,j;
1172 	uint32_t vdsn;
1173 	uint16_t ident;
1174 	long next_s = 0, next_e = 0;
1175 
1176 	memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1177 
1178 	/* Read the main descriptor sequence */
1179 	for (;(!done && block <= lastblock); block++)
1180 	{
1181 
1182 		bh = udf_read_tagged(sb, block, block, &ident);
1183 		if (!bh)
1184 			break;
1185 
1186 		/* Process each descriptor (ISO 13346 3/8.3-8.4) */
1187 		gd = (struct generic_desc *)bh->b_data;
1188 		vdsn = le32_to_cpu(gd->volDescSeqNum);
1189 		switch (ident)
1190 		{
1191 			case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1192 				if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1193 				{
1194 					vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1195 					vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1196 				}
1197 				break;
1198 			case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1199 				if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1200 				{
1201 					vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1202 					vds[VDS_POS_VOL_DESC_PTR].block = block;
1203 
1204 					vdp = (struct volDescPtr *)bh->b_data;
1205 					next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1206 					next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1207 					next_e = next_e >> sb->s_blocksize_bits;
1208 					next_e += next_s;
1209 				}
1210 				break;
1211 			case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1212 				if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1213 				{
1214 					vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1215 					vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1216 				}
1217 				break;
1218 			case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1219 				if (!vds[VDS_POS_PARTITION_DESC].block)
1220 					vds[VDS_POS_PARTITION_DESC].block = block;
1221 				break;
1222 			case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1223 				if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1224 				{
1225 					vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1226 					vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1227 				}
1228 				break;
1229 			case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1230 				if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1231 				{
1232 					vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1233 					vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1234 				}
1235 				break;
1236 			case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1237 				vds[VDS_POS_TERMINATING_DESC].block = block;
1238 				if (next_e)
1239 				{
1240 					block = next_s;
1241 					lastblock = next_e;
1242 					next_s = next_e = 0;
1243 				}
1244 				else
1245 					done = 1;
1246 				break;
1247 		}
1248 		brelse(bh);
1249 	}
1250 	for (i=0; i<VDS_POS_LENGTH; i++)
1251 	{
1252 		if (vds[i].block)
1253 		{
1254 			bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1255 
1256 			if (i == VDS_POS_PRIMARY_VOL_DESC)
1257 				udf_load_pvoldesc(sb, bh);
1258 			else if (i == VDS_POS_LOGICAL_VOL_DESC)
1259 				udf_load_logicalvol(sb, bh, fileset);
1260 			else if (i == VDS_POS_PARTITION_DESC)
1261 			{
1262 				struct buffer_head *bh2 = NULL;
1263 				udf_load_partdesc(sb, bh);
1264 				for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1265 				{
1266 					bh2 = udf_read_tagged(sb, j, j, &ident);
1267 					gd = (struct generic_desc *)bh2->b_data;
1268 					if (ident == TAG_IDENT_PD)
1269 						udf_load_partdesc(sb, bh2);
1270 					brelse(bh2);
1271 				}
1272 			}
1273 			brelse(bh);
1274 		}
1275 	}
1276 
1277 	return 0;
1278 }
1279 
1280 /*
1281  * udf_check_valid()
1282  */
1283 static int
1284 udf_check_valid(struct super_block *sb, int novrs, int silent)
1285 {
1286 	long block;
1287 
1288 	if (novrs)
1289 	{
1290 		udf_debug("Validity check skipped because of novrs option\n");
1291 		return 0;
1292 	}
1293 	/* Check that it is NSR02 compliant */
1294 	/* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1295 	else if ((block = udf_vrs(sb, silent)) == -1)
1296 	{
1297 		udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1298 		if (!UDF_SB_LASTBLOCK(sb))
1299 			UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1300 		return 0;
1301 	}
1302 	else
1303 		return !block;
1304 }
1305 
1306 static int
1307 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1308 {
1309 	struct anchorVolDescPtr *anchor;
1310 	uint16_t ident;
1311 	struct buffer_head *bh;
1312 	long main_s, main_e, reserve_s, reserve_e;
1313 	int i, j;
1314 
1315 	if (!sb)
1316 		return 1;
1317 
1318 	for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1319 		if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1320 			UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1321 		{
1322 			anchor = (struct anchorVolDescPtr *)bh->b_data;
1323 
1324 			/* Locate the main sequence */
1325 			main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1326 			main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1327 			main_e = main_e >> sb->s_blocksize_bits;
1328 			main_e += main_s;
1329 
1330 			/* Locate the reserve sequence */
1331 			reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1332 			reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1333 			reserve_e = reserve_e >> sb->s_blocksize_bits;
1334 			reserve_e += reserve_s;
1335 
1336 			brelse(bh);
1337 
1338 			/* Process the main & reserve sequences */
1339 			/* responsible for finding the PartitionDesc(s) */
1340 			if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1341 				udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1342 			{
1343 				break;
1344 			}
1345 		}
1346 	}
1347 
1348 	if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1349 		udf_debug("No Anchor block found\n");
1350 		return 1;
1351 	} else
1352 		udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1353 
1354 	for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1355 	{
1356 		switch UDF_SB_PARTTYPE(sb, i)
1357 		{
1358 			case UDF_VIRTUAL_MAP15:
1359 			case UDF_VIRTUAL_MAP20:
1360 			{
1361 				kernel_lb_addr ino;
1362 
1363 				if (!UDF_SB_LASTBLOCK(sb))
1364 				{
1365 					UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1366 					udf_find_anchor(sb);
1367 				}
1368 
1369 				if (!UDF_SB_LASTBLOCK(sb))
1370 				{
1371 					udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1372 					return 1;
1373 				}
1374 
1375 				for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1376 				{
1377 					if (j != i &&
1378 						UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1379 						UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1380 					{
1381 						ino.partitionReferenceNum = j;
1382 						ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1383 							UDF_SB_PARTROOT(sb,j);
1384 						break;
1385 					}
1386 				}
1387 
1388 				if (j == UDF_SB_NUMPARTS(sb))
1389 					return 1;
1390 
1391 				if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1392 					return 1;
1393 
1394 				if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1395 				{
1396 					UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1397 					UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1398 				}
1399 				else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1400 				{
1401 					struct buffer_head *bh = NULL;
1402 					uint32_t pos;
1403 
1404 					pos = udf_block_map(UDF_SB_VAT(sb), 0);
1405 					bh = sb_bread(sb, pos);
1406 					if (!bh)
1407 						return 1;
1408 					UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1409 						le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1410 							udf_ext0_offset(UDF_SB_VAT(sb));
1411 					UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1412 						UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1413 					brelse(bh);
1414 				}
1415 				UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1416 				UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1417 			}
1418 		}
1419 	}
1420 	return 0;
1421 }
1422 
1423 static void udf_open_lvid(struct super_block *sb)
1424 {
1425 	if (UDF_SB_LVIDBH(sb))
1426 	{
1427 		int i;
1428 		kernel_timestamp cpu_time;
1429 
1430 		UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1431 		UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1432 		if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1433 			UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1434 		UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1435 
1436 		UDF_SB_LVID(sb)->descTag.descCRC =
1437 			cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1438 			le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1439 
1440 		UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1441 		for (i=0; i<16; i++)
1442 			if (i != 4)
1443 				UDF_SB_LVID(sb)->descTag.tagChecksum +=
1444 					((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1445 
1446 		mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1447 	}
1448 }
1449 
1450 static void udf_close_lvid(struct super_block *sb)
1451 {
1452 	if (UDF_SB_LVIDBH(sb) &&
1453 		UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1454 	{
1455 		int i;
1456 		kernel_timestamp cpu_time;
1457 
1458 		UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1459 		UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1460 		if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1461 			UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1462 		if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1463 			UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1464 		if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1465 			UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1466 		if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1467 			UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1468 		UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1469 
1470 		UDF_SB_LVID(sb)->descTag.descCRC =
1471 			cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1472 			le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1473 
1474 		UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1475 		for (i=0; i<16; i++)
1476 			if (i != 4)
1477 				UDF_SB_LVID(sb)->descTag.tagChecksum +=
1478 					((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1479 
1480 		mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1481 	}
1482 }
1483 
1484 /*
1485  * udf_read_super
1486  *
1487  * PURPOSE
1488  *	Complete the specified super block.
1489  *
1490  * PRE-CONDITIONS
1491  *	sb			Pointer to superblock to complete - never NULL.
1492  *	sb->s_dev		Device to read suberblock from.
1493  *	options			Pointer to mount options.
1494  *	silent			Silent flag.
1495  *
1496  * HISTORY
1497  *	July 1, 1997 - Andrew E. Mileski
1498  *	Written, tested, and released.
1499  */
1500 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1501 {
1502 	int i;
1503 	struct inode *inode=NULL;
1504 	struct udf_options uopt;
1505 	kernel_lb_addr rootdir, fileset;
1506 	struct udf_sb_info *sbi;
1507 
1508 	uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1509 	uopt.uid = -1;
1510 	uopt.gid = -1;
1511 	uopt.umask = 0;
1512 
1513 	sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1514 	if (!sbi)
1515 		return -ENOMEM;
1516 	sb->s_fs_info = sbi;
1517 	memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1518 
1519 	mutex_init(&sbi->s_alloc_mutex);
1520 
1521 	if (!udf_parse_options((char *)options, &uopt))
1522 		goto error_out;
1523 
1524 	if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1525 	    uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1526 	{
1527 		udf_error(sb, "udf_read_super",
1528 			"utf8 cannot be combined with iocharset\n");
1529 		goto error_out;
1530 	}
1531 #ifdef CONFIG_UDF_NLS
1532 	if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1533 	{
1534 		uopt.nls_map = load_nls_default();
1535 		if (!uopt.nls_map)
1536 			uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1537 		else
1538 			udf_debug("Using default NLS map\n");
1539 	}
1540 #endif
1541 	if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1542 		uopt.flags |= (1 << UDF_FLAG_UTF8);
1543 
1544 	fileset.logicalBlockNum = 0xFFFFFFFF;
1545 	fileset.partitionReferenceNum = 0xFFFF;
1546 
1547 	UDF_SB(sb)->s_flags = uopt.flags;
1548 	UDF_SB(sb)->s_uid = uopt.uid;
1549 	UDF_SB(sb)->s_gid = uopt.gid;
1550 	UDF_SB(sb)->s_umask = uopt.umask;
1551 	UDF_SB(sb)->s_nls_map = uopt.nls_map;
1552 
1553 	/* Set the block size for all transfers */
1554 	if (!udf_set_blocksize(sb, uopt.blocksize))
1555 		goto error_out;
1556 
1557 	if ( uopt.session == 0xFFFFFFFF )
1558 		UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1559 	else
1560 		UDF_SB_SESSION(sb) = uopt.session;
1561 
1562 	udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1563 
1564 	UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1565 	UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1566 	UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1567 	UDF_SB_ANCHOR(sb)[3] = 256;
1568 
1569 	if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1570 	{
1571 		printk("UDF-fs: No VRS found\n");
1572  		goto error_out;
1573 	}
1574 
1575 	udf_find_anchor(sb);
1576 
1577 	/* Fill in the rest of the superblock */
1578 	sb->s_op = &udf_sb_ops;
1579 	sb->dq_op = NULL;
1580 	sb->s_dirt = 0;
1581 	sb->s_magic = UDF_SUPER_MAGIC;
1582 	sb->s_time_gran = 1000;
1583 
1584 	if (udf_load_partition(sb, &fileset))
1585 	{
1586 		printk("UDF-fs: No partition found (1)\n");
1587 		goto error_out;
1588 	}
1589 
1590 	udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1591 
1592 	if ( UDF_SB_LVIDBH(sb) )
1593 	{
1594 		uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1595 		uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1596 		/* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1597 
1598 		if (minUDFReadRev > UDF_MAX_READ_VERSION)
1599 		{
1600 			printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1601 				le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1602 				UDF_MAX_READ_VERSION);
1603 			goto error_out;
1604 		}
1605 		else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1606 		{
1607 			sb->s_flags |= MS_RDONLY;
1608 		}
1609 
1610 		UDF_SB_UDFREV(sb) = minUDFWriteRev;
1611 
1612 		if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1613 			UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1614 		if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1615 			UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1616 	}
1617 
1618 	if ( !UDF_SB_NUMPARTS(sb) )
1619 	{
1620 		printk("UDF-fs: No partition found (2)\n");
1621 		goto error_out;
1622 	}
1623 
1624 	if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1625 		printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1626 		sb->s_flags |= MS_RDONLY;
1627 	}
1628 
1629 	if ( udf_find_fileset(sb, &fileset, &rootdir) )
1630 	{
1631 		printk("UDF-fs: No fileset found\n");
1632 		goto error_out;
1633 	}
1634 
1635 	if (!silent)
1636 	{
1637 		kernel_timestamp ts;
1638 		udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1639 		udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1640 			UDFFS_VERSION, UDFFS_DATE,
1641 			UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1642 			ts.typeAndTimezone);
1643 	}
1644 	if (!(sb->s_flags & MS_RDONLY))
1645 		udf_open_lvid(sb);
1646 
1647 	/* Assign the root inode */
1648 	/* assign inodes by physical block number */
1649 	/* perhaps it's not extensible enough, but for now ... */
1650 	inode = udf_iget(sb, rootdir);
1651 	if (!inode)
1652 	{
1653 		printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1654 			rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1655 		goto error_out;
1656 	}
1657 
1658 	/* Allocate a dentry for the root inode */
1659 	sb->s_root = d_alloc_root(inode);
1660 	if (!sb->s_root)
1661 	{
1662 		printk("UDF-fs: Couldn't allocate root dentry\n");
1663 		iput(inode);
1664 		goto error_out;
1665 	}
1666 	sb->s_maxbytes = MAX_LFS_FILESIZE;
1667 	return 0;
1668 
1669 error_out:
1670 	if (UDF_SB_VAT(sb))
1671 		iput(UDF_SB_VAT(sb));
1672 	if (UDF_SB_NUMPARTS(sb))
1673 	{
1674 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1675 			iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1676 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1677 			iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1678 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1679 			UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1680 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1681 			UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1682 		if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1683 		{
1684 			for (i=0; i<4; i++)
1685 				brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1686 		}
1687 	}
1688 #ifdef CONFIG_UDF_NLS
1689 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1690 		unload_nls(UDF_SB(sb)->s_nls_map);
1691 #endif
1692 	if (!(sb->s_flags & MS_RDONLY))
1693 		udf_close_lvid(sb);
1694 	brelse(UDF_SB_LVIDBH(sb));
1695 	UDF_SB_FREE(sb);
1696 	kfree(sbi);
1697 	sb->s_fs_info = NULL;
1698 	return -EINVAL;
1699 }
1700 
1701 void udf_error(struct super_block *sb, const char *function,
1702 	const char *fmt, ...)
1703 {
1704 	va_list args;
1705 
1706 	if (!(sb->s_flags & MS_RDONLY))
1707 	{
1708 		/* mark sb error */
1709 		sb->s_dirt = 1;
1710 	}
1711 	va_start(args, fmt);
1712 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1713 	va_end(args);
1714 	printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1715 		sb->s_id, function, error_buf);
1716 }
1717 
1718 void udf_warning(struct super_block *sb, const char *function,
1719 	const char *fmt, ...)
1720 {
1721 	va_list args;
1722 
1723 	va_start (args, fmt);
1724 	vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1725 	va_end(args);
1726 	printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1727 		sb->s_id, function, error_buf);
1728 }
1729 
1730 /*
1731  * udf_put_super
1732  *
1733  * PURPOSE
1734  *	Prepare for destruction of the superblock.
1735  *
1736  * DESCRIPTION
1737  *	Called before the filesystem is unmounted.
1738  *
1739  * HISTORY
1740  *	July 1, 1997 - Andrew E. Mileski
1741  *	Written, tested, and released.
1742  */
1743 static void
1744 udf_put_super(struct super_block *sb)
1745 {
1746 	int i;
1747 
1748 	if (UDF_SB_VAT(sb))
1749 		iput(UDF_SB_VAT(sb));
1750 	if (UDF_SB_NUMPARTS(sb))
1751 	{
1752 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1753 			iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1754 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1755 			iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1756 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1757 			UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1758 		if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1759 			UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1760 		if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1761 		{
1762 			for (i=0; i<4; i++)
1763 				brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1764 		}
1765 	}
1766 #ifdef CONFIG_UDF_NLS
1767 	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1768 		unload_nls(UDF_SB(sb)->s_nls_map);
1769 #endif
1770 	if (!(sb->s_flags & MS_RDONLY))
1771 		udf_close_lvid(sb);
1772 	brelse(UDF_SB_LVIDBH(sb));
1773 	UDF_SB_FREE(sb);
1774 	kfree(sb->s_fs_info);
1775 	sb->s_fs_info = NULL;
1776 }
1777 
1778 /*
1779  * udf_stat_fs
1780  *
1781  * PURPOSE
1782  *	Return info about the filesystem.
1783  *
1784  * DESCRIPTION
1785  *	Called by sys_statfs()
1786  *
1787  * HISTORY
1788  *	July 1, 1997 - Andrew E. Mileski
1789  *	Written, tested, and released.
1790  */
1791 static int
1792 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1793 {
1794 	struct super_block *sb = dentry->d_sb;
1795 
1796 	buf->f_type = UDF_SUPER_MAGIC;
1797 	buf->f_bsize = sb->s_blocksize;
1798 	buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1799 	buf->f_bfree = udf_count_free(sb);
1800 	buf->f_bavail = buf->f_bfree;
1801 	buf->f_files = (UDF_SB_LVIDBH(sb) ?
1802 		(le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1803 		le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1804 	buf->f_ffree = buf->f_bfree;
1805 	/* __kernel_fsid_t f_fsid */
1806 	buf->f_namelen = UDF_NAME_LEN-2;
1807 
1808 	return 0;
1809 }
1810 
1811 static unsigned char udf_bitmap_lookup[16] = {
1812 	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1813 };
1814 
1815 static unsigned int
1816 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1817 {
1818 	struct buffer_head *bh = NULL;
1819 	unsigned int accum = 0;
1820 	int index;
1821 	int block = 0, newblock;
1822 	kernel_lb_addr loc;
1823 	uint32_t bytes;
1824 	uint8_t value;
1825 	uint8_t *ptr;
1826 	uint16_t ident;
1827 	struct spaceBitmapDesc *bm;
1828 
1829 	lock_kernel();
1830 
1831 	loc.logicalBlockNum = bitmap->s_extPosition;
1832 	loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1833 	bh = udf_read_ptagged(sb, loc, 0, &ident);
1834 
1835 	if (!bh)
1836 	{
1837 		printk(KERN_ERR "udf: udf_count_free failed\n");
1838 		goto out;
1839 	}
1840 	else if (ident != TAG_IDENT_SBD)
1841 	{
1842 		brelse(bh);
1843 		printk(KERN_ERR "udf: udf_count_free failed\n");
1844 		goto out;
1845 	}
1846 
1847 	bm = (struct spaceBitmapDesc *)bh->b_data;
1848 	bytes = le32_to_cpu(bm->numOfBytes);
1849 	index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1850 	ptr = (uint8_t *)bh->b_data;
1851 
1852 	while ( bytes > 0 )
1853 	{
1854 		while ((bytes > 0) && (index < sb->s_blocksize))
1855 		{
1856 			value = ptr[index];
1857 			accum += udf_bitmap_lookup[ value & 0x0f ];
1858 			accum += udf_bitmap_lookup[ value >> 4 ];
1859 			index++;
1860 			bytes--;
1861 		}
1862 		if ( bytes )
1863 		{
1864 			brelse(bh);
1865 			newblock = udf_get_lb_pblock(sb, loc, ++block);
1866 			bh = udf_tread(sb, newblock);
1867 			if (!bh)
1868 			{
1869 				udf_debug("read failed\n");
1870 				goto out;
1871 			}
1872 			index = 0;
1873 			ptr = (uint8_t *)bh->b_data;
1874 		}
1875 	}
1876 	brelse(bh);
1877 
1878 out:
1879 	unlock_kernel();
1880 
1881 	return accum;
1882 }
1883 
1884 static unsigned int
1885 udf_count_free_table(struct super_block *sb, struct inode * table)
1886 {
1887 	unsigned int accum = 0;
1888 	uint32_t elen;
1889 	kernel_lb_addr eloc;
1890 	int8_t etype;
1891 	struct extent_position epos;
1892 
1893 	lock_kernel();
1894 
1895 	epos.block = UDF_I_LOCATION(table);
1896 	epos.offset = sizeof(struct unallocSpaceEntry);
1897 	epos.bh = NULL;
1898 
1899 	while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1900 		accum += (elen >> table->i_sb->s_blocksize_bits);
1901 	brelse(epos.bh);
1902 
1903 	unlock_kernel();
1904 
1905 	return accum;
1906 }
1907 
1908 static unsigned int
1909 udf_count_free(struct super_block *sb)
1910 {
1911 	unsigned int accum = 0;
1912 
1913 	if (UDF_SB_LVIDBH(sb))
1914 	{
1915 		if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1916 		{
1917 			accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1918 
1919 			if (accum == 0xFFFFFFFF)
1920 				accum = 0;
1921 		}
1922 	}
1923 
1924 	if (accum)
1925 		return accum;
1926 
1927 	if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1928 	{
1929 		accum += udf_count_free_bitmap(sb,
1930 			UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1931 	}
1932 	if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1933 	{
1934 		accum += udf_count_free_bitmap(sb,
1935 			UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1936 	}
1937 	if (accum)
1938 		return accum;
1939 
1940 	if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1941 	{
1942 		accum += udf_count_free_table(sb,
1943 			UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1944 	}
1945 	if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1946 	{
1947 		accum += udf_count_free_table(sb,
1948 			UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1949 	}
1950 
1951 	return accum;
1952 }
1953