File: /usr/src/linux/fs/udf/super.c
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 * CONTACTS
18 * E-mail regarding any portion of the Linux UDF file system should be
19 * directed to the development team mailing list (run by majordomo):
20 * linux_udf@hpesjro.fc.hp.com
21 *
22 * COPYRIGHT
23 * This file is distributed under the terms of the GNU General Public
24 * License (GPL). Copies of the GPL can be obtained from:
25 * ftp://prep.ai.mit.edu/pub/gnu/GPL
26 * Each contributing author retains all rights to their own work.
27 *
28 * (C) 1998 Dave Boynton
29 * (C) 1998-2000 Ben Fennema
30 * (C) 2000 Stelias Computing Inc
31 *
32 * HISTORY
33 *
34 * 09/24/98 dgb changed to allow compiling outside of kernel, and
35 * added some debugging.
36 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
37 * 10/16/98 attempting some multi-session support
38 * 10/17/98 added freespace count for "df"
39 * 11/11/98 gr added novrs option
40 * 11/26/98 dgb added fileset,anchor mount options
41 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced vol descs
42 * rewrote option handling based on isofs
43 * 12/20/98 find the free space bitmap (if it exists)
44 */
45
46 #include "udfdecl.h"
47
48 #include <linux/config.h>
49 #include <linux/version.h>
50 #include <linux/blkdev.h>
51 #include <linux/slab.h>
52 #include <linux/kernel.h>
53 #include <linux/locks.h>
54 #include <linux/module.h>
55 #include <linux/stat.h>
56 #include <linux/cdrom.h>
57 #include <linux/nls.h>
58 #include <asm/byteorder.h>
59
60 #include <linux/udf_fs.h>
61 #include "udf_sb.h"
62 #include "udf_i.h"
63
64 #include <linux/init.h>
65 #include <asm/uaccess.h>
66
67 #define VDS_POS_PRIMARY_VOL_DESC 0
68 #define VDS_POS_UNALLOC_SPACE_DESC 1
69 #define VDS_POS_LOGICAL_VOL_DESC 2
70 #define VDS_POS_PARTITION_DESC 3
71 #define VDS_POS_IMP_USE_VOL_DESC 4
72 #define VDS_POS_VOL_DESC_PTR 5
73 #define VDS_POS_TERMINATING_DESC 6
74 #define VDS_POS_LENGTH 7
75
76 static char error_buf[1024];
77
78 /* These are the "meat" - everything else is stuffing */
79 static struct super_block *udf_read_super(struct super_block *, void *, int);
80 static void udf_put_super(struct super_block *);
81 static void udf_write_super(struct super_block *);
82 static int udf_remount_fs(struct super_block *, int *, char *);
83 static int udf_check_valid(struct super_block *, int, int);
84 static int udf_vrs(struct super_block *sb, int silent);
85 static int udf_load_partition(struct super_block *, lb_addr *);
86 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, lb_addr *);
87 static void udf_load_logicalvolint(struct super_block *, extent_ad);
88 static int udf_find_anchor(struct super_block *, int, int);
89 static int udf_find_fileset(struct super_block *, lb_addr *, lb_addr *);
90 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
91 static void udf_load_fileset(struct super_block *, struct buffer_head *, lb_addr *);
92 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
93 static void udf_open_lvid(struct super_block *);
94 static void udf_close_lvid(struct super_block *);
95 static unsigned int udf_count_free(struct super_block *);
96 static int udf_statfs(struct super_block *, struct statfs *);
97
98 /* UDF filesystem type */
99 static DECLARE_FSTYPE_DEV(udf_fstype, "udf", udf_read_super);
100
101 /* Superblock operations */
102 static struct super_operations udf_sb_ops = {
103 read_inode: udf_read_inode,
104 write_inode: udf_write_inode,
105 put_inode: udf_put_inode,
106 delete_inode: udf_delete_inode,
107 put_super: udf_put_super,
108 write_super: udf_write_super,
109 statfs: udf_statfs,
110 remount_fs: udf_remount_fs,
111 };
112
113 struct udf_options
114 {
115 unsigned char novrs;
116 unsigned int blocksize;
117 unsigned int session;
118 unsigned int lastblock;
119 unsigned int anchor;
120 unsigned int volume;
121 unsigned short partition;
122 unsigned int fileset;
123 unsigned int rootdir;
124 unsigned int flags;
125 mode_t umask;
126 gid_t gid;
127 uid_t uid;
128 struct nls_table *nls_map;
129 };
130
131 static int __init init_udf_fs(void)
132 {
133 printk(KERN_NOTICE "udf: registering filesystem\n");
134 return register_filesystem(&udf_fstype);
135 }
136
137 static void __exit exit_udf_fs(void)
138 {
139 printk(KERN_NOTICE "udf: unregistering filesystem\n");
140 unregister_filesystem(&udf_fstype);
141 }
142
143 EXPORT_NO_SYMBOLS;
144
145 module_init(init_udf_fs)
146 module_exit(exit_udf_fs)
147
148 /*
149 * udf_parse_options
150 *
151 * PURPOSE
152 * Parse mount options.
153 *
154 * DESCRIPTION
155 * The following mount options are supported:
156 *
157 * gid= Set the default group.
158 * umask= Set the default umask.
159 * uid= Set the default user.
160 * bs= Set the block size.
161 * unhide Show otherwise hidden files.
162 * undelete Show deleted files in lists.
163 * adinicb Embed data in the inode (default)
164 * noadinicb Don't embed data in the inode
165 * shortad Use short ad's
166 * longad Use long ad's (default)
167 * strict Set strict conformance
168 * iocharset= Set the NLS character set
169 *
170 * The remaining are for debugging and disaster recovery:
171 *
172 * novrs Skip volume sequence recognition
173 *
174 * The following expect a offset from 0.
175 *
176 * session= Set the CDROM session (default= last session)
177 * anchor= Override standard anchor location. (default= 256)
178 * volume= Override the VolumeDesc location. (unused)
179 * partition= Override the PartitionDesc location. (unused)
180 * lastblock= Set the last block of the filesystem/
181 *
182 * The following expect a offset from the partition root.
183 *
184 * fileset= Override the fileset block location. (unused)
185 * rootdir= Override the root directory location. (unused)
186 * WARNING: overriding the rootdir to a non-directory may
187 * yield highly unpredictable results.
188 *
189 * PRE-CONDITIONS
190 * options Pointer to mount options string.
191 * uopts Pointer to mount options variable.
192 *
193 * POST-CONDITIONS
194 * <return> 0 Mount options parsed okay.
195 * <return> -1 Error parsing mount options.
196 *
197 * HISTORY
198 * July 1, 1997 - Andrew E. Mileski
199 * Written, tested, and released.
200 */
201
202 static int
203 udf_parse_options(char *options, struct udf_options *uopt)
204 {
205 char *opt, *val;
206
207 uopt->novrs = 0;
208 uopt->blocksize = 2048;
209 uopt->partition = 0xFFFF;
210 uopt->session = 0xFFFFFFFF;
211 uopt->lastblock = 0xFFFFFFFF;
212 uopt->anchor = 0xFFFFFFFF;
213 uopt->volume = 0xFFFFFFFF;
214 uopt->rootdir = 0xFFFFFFFF;
215 uopt->fileset = 0xFFFFFFFF;
216 uopt->nls_map = NULL;
217
218 if (!options)
219 return 1;
220
221 for (opt = strtok(options, ","); opt; opt = strtok(NULL, ","))
222 {
223 /* Make "opt=val" into two strings */
224 val = strchr(opt, '=');
225 if (val)
226 *(val++) = 0;
227 if (!strcmp(opt, "novrs") && !val)
228 uopt->novrs = 1;
229 else if (!strcmp(opt, "bs") && val)
230 uopt->blocksize = simple_strtoul(val, NULL, 0);
231 else if (!strcmp(opt, "unhide") && !val)
232 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
233 else if (!strcmp(opt, "undelete") && !val)
234 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
235 else if (!strcmp(opt, "noadinicb") && !val)
236 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
237 else if (!strcmp(opt, "adinicb") && !val)
238 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
239 else if (!strcmp(opt, "shortad") && !val)
240 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
241 else if (!strcmp(opt, "longad") && !val)
242 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
243 else if (!strcmp(opt, "gid") && val)
244 uopt->gid = simple_strtoul(val, NULL, 0);
245 else if (!strcmp(opt, "umask") && val)
246 uopt->umask = simple_strtoul(val, NULL, 0);
247 else if (!strcmp(opt, "strict") && !val)
248 uopt->flags |= (1 << UDF_FLAG_STRICT);
249 else if (!strcmp(opt, "uid") && val)
250 uopt->uid = simple_strtoul(val, NULL, 0);
251 else if (!strcmp(opt, "session") && val)
252 uopt->session = simple_strtoul(val, NULL, 0);
253 else if (!strcmp(opt, "lastblock") && val)
254 uopt->lastblock = simple_strtoul(val, NULL, 0);
255 else if (!strcmp(opt, "anchor") && val)
256 uopt->anchor = simple_strtoul(val, NULL, 0);
257 else if (!strcmp(opt, "volume") && val)
258 uopt->volume = simple_strtoul(val, NULL, 0);
259 else if (!strcmp(opt, "partition") && val)
260 uopt->partition = simple_strtoul(val, NULL, 0);
261 else if (!strcmp(opt, "fileset") && val)
262 uopt->fileset = simple_strtoul(val, NULL, 0);
263 else if (!strcmp(opt, "rootdir") && val)
264 uopt->rootdir = simple_strtoul(val, NULL, 0);
265 #ifdef CONFIG_NLS
266 else if (!strcmp(opt, "iocharset") && val)
267 {
268 uopt->nls_map = load_nls(val);
269 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
270 }
271 #endif
272 else if (!strcmp(opt, "utf8") && !val)
273 uopt->flags |= (1 << UDF_FLAG_UTF8);
274 else if (val)
275 {
276 printk(KERN_ERR "udf: bad mount option \"%s=%s\"\n",
277 opt, val);
278 return 0;
279 }
280 else
281 {
282 printk(KERN_ERR "udf: bad mount option \"%s\"\n",
283 opt);
284 return 0;
285 }
286 }
287 return 1;
288 }
289
290 void
291 udf_write_super(struct super_block *sb)
292 {
293 if (!(sb->s_flags & MS_RDONLY))
294 udf_open_lvid(sb);
295 sb->s_dirt = 0;
296 }
297
298 static int
299 udf_remount_fs(struct super_block *sb, int *flags, char *options)
300 {
301 struct udf_options uopt;
302
303 uopt.flags = UDF_SB(sb)->s_flags ;
304 uopt.uid = UDF_SB(sb)->s_uid ;
305 uopt.gid = UDF_SB(sb)->s_gid ;
306 uopt.umask = UDF_SB(sb)->s_umask ;
307
308 if ( !udf_parse_options(options, &uopt) )
309 return -EINVAL;
310
311 UDF_SB(sb)->s_flags = uopt.flags;
312 UDF_SB(sb)->s_uid = uopt.uid;
313 UDF_SB(sb)->s_gid = uopt.gid;
314 UDF_SB(sb)->s_umask = uopt.umask;
315
316 #if UDFFS_RW != 1
317 *flags |= MS_RDONLY;
318 #endif
319
320 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
321 return 0;
322 if (*flags & MS_RDONLY)
323 udf_close_lvid(sb);
324 else
325 udf_open_lvid(sb);
326
327 return 0;
328 }
329
330 /*
331 * udf_set_blocksize
332 *
333 * PURPOSE
334 * Set the block size to be used in all transfers.
335 *
336 * DESCRIPTION
337 * To allow room for a DMA transfer, it is best to guess big when unsure.
338 * This routine picks 2048 bytes as the blocksize when guessing. This
339 * should be adequate until devices with larger block sizes become common.
340 *
341 * Note that the Linux kernel can currently only deal with blocksizes of
342 * 512, 1024, 2048, 4096, and 8192 bytes.
343 *
344 * PRE-CONDITIONS
345 * sb Pointer to _locked_ superblock.
346 *
347 * POST-CONDITIONS
348 * sb->s_blocksize Blocksize.
349 * sb->s_blocksize_bits log2 of blocksize.
350 * <return> 0 Blocksize is valid.
351 * <return> 1 Blocksize is invalid.
352 *
353 * HISTORY
354 * July 1, 1997 - Andrew E. Mileski
355 * Written, tested, and released.
356 */
357 static int
358 udf_set_blocksize(struct super_block *sb, int bsize)
359 {
360 /* Use specified block size if specified */
361 if (bsize)
362 sb->s_blocksize = bsize;
363 if (get_hardsect_size(sb->s_dev) > sb->s_blocksize)
364 sb->s_blocksize = get_hardsect_size(sb->s_dev);
365
366 /* Block size must be an even multiple of 512 */
367 switch (sb->s_blocksize)
368 {
369 case 512: sb->s_blocksize_bits = 9; break;
370 case 1024: sb->s_blocksize_bits = 10; break;
371 case 2048: sb->s_blocksize_bits = 11; break;
372 case 4096: sb->s_blocksize_bits = 12; break;
373 case 8192: sb->s_blocksize_bits = 13; break;
374 default:
375 {
376 udf_debug("Bad block size (%ld)\n", sb->s_blocksize);
377 printk(KERN_ERR "udf: bad block size (%ld)\n", sb->s_blocksize);
378 return 0;
379 }
380 }
381
382 /* Set the block size */
383 set_blocksize(sb->s_dev, sb->s_blocksize);
384 return sb->s_blocksize;
385 }
386
387 static int
388 udf_vrs(struct super_block *sb, int silent)
389 {
390 struct VolStructDesc *vsd = NULL;
391 int sector = 32768;
392 int sectorsize;
393 struct buffer_head *bh = NULL;
394 int iso9660=0;
395 int nsr02=0;
396 int nsr03=0;
397
398 /* Block size must be a multiple of 512 */
399 if (sb->s_blocksize & 511)
400 return 0;
401
402 if (sb->s_blocksize < sizeof(struct VolStructDesc))
403 sectorsize = sizeof(struct VolStructDesc);
404 else
405 sectorsize = sb->s_blocksize;
406
407 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
408
409 udf_debug("Starting at sector %u (%ld byte sectors)\n",
410 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
411 /* Process the sequence (if applicable) */
412 for (;!nsr02 && !nsr03; sector += sectorsize)
413 {
414 /* Read a block */
415 bh = udf_tread(sb, sector >> sb->s_blocksize_bits, sb->s_blocksize);
416 if (!bh)
417 break;
418
419 /* Look for ISO descriptors */
420 vsd = (struct VolStructDesc *)(bh->b_data +
421 (sector & (sb->s_blocksize - 1)));
422
423 if (vsd->stdIdent[0] == 0)
424 {
425 udf_release_data(bh);
426 break;
427 }
428 else if (!strncmp(vsd->stdIdent, STD_ID_CD001, STD_ID_LEN))
429 {
430 iso9660 = sector;
431 switch (vsd->structType)
432 {
433 case 0:
434 udf_debug("ISO9660 Boot Record found\n");
435 break;
436 case 1:
437 udf_debug("ISO9660 Primary Volume Descriptor found\n");
438 break;
439 case 2:
440 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
441 break;
442 case 3:
443 udf_debug("ISO9660 Volume Partition Descriptor found\n");
444 break;
445 case 255:
446 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
447 break;
448 default:
449 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
450 break;
451 }
452 }
453 else if (!strncmp(vsd->stdIdent, STD_ID_BEA01, STD_ID_LEN))
454 {
455 }
456 else if (!strncmp(vsd->stdIdent, STD_ID_TEA01, STD_ID_LEN))
457 {
458 udf_release_data(bh);
459 break;
460 }
461 else if (!strncmp(vsd->stdIdent, STD_ID_NSR02, STD_ID_LEN))
462 {
463 nsr02 = sector;
464 }
465 else if (!strncmp(vsd->stdIdent, STD_ID_NSR03, STD_ID_LEN))
466 {
467 nsr03 = sector;
468 }
469 udf_release_data(bh);
470 }
471
472 if (nsr03)
473 return nsr03;
474 else if (nsr02)
475 return nsr02;
476 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
477 return -1;
478 else
479 return 0;
480 }
481
482 /*
483 * udf_find_anchor
484 *
485 * PURPOSE
486 * Find an anchor volume descriptor.
487 *
488 * PRE-CONDITIONS
489 * sb Pointer to _locked_ superblock.
490 * lastblock Last block on media.
491 *
492 * POST-CONDITIONS
493 * <return> 1 if not found, 0 if ok
494 *
495 * HISTORY
496 * July 1, 1997 - Andrew E. Mileski
497 * Written, tested, and released.
498 */
499 static int
500 udf_find_anchor(struct super_block *sb, int useranchor, int lastblock)
501 {
502 int varlastblock = udf_variable_to_fixed(lastblock);
503 int last[] = { lastblock, lastblock - 2,
504 lastblock - 150, lastblock - 152,
505 varlastblock, varlastblock - 2,
506 varlastblock - 150, varlastblock - 152 };
507 struct buffer_head *bh = NULL;
508 Uint16 ident;
509 Uint32 location;
510 int i;
511
512 UDF_SB_ANCHOR(sb)[0] = 0;
513 UDF_SB_ANCHOR(sb)[1] = 0;
514 UDF_SB_ANCHOR(sb)[2] = 0;
515 UDF_SB_ANCHOR(sb)[3] = 256 + UDF_SB_SESSION(sb);
516
517 lastblock = 0;
518
519 /* Search for an anchor volume descriptor pointer */
520
521 /* according to spec, anchor is in either:
522 * block 256
523 * lastblock-256
524 * lastblock
525 * however, if the disc isn't closed, it could be 512 */
526
527 for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
528 {
529 if (last[i] < 0 || !(bh = bread(sb->s_dev, last[i], sb->s_blocksize)))
530 {
531 ident = location = 0;
532 }
533 else
534 {
535 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
536 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
537 udf_release_data(bh);
538 }
539
540 if (ident == TID_ANCHOR_VOL_DESC_PTR)
541 {
542 if (location == last[i] - UDF_SB_SESSION(sb))
543 {
544 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i];
545 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
546 }
547 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
548 {
549 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
550 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]);
551 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
552 }
553 else
554 udf_debug("Anchor found at block %d, location mismatch %d.\n",
555 last[i], location);
556 }
557 else if (ident == TID_FILE_ENTRY || ident == TID_EXTENDED_FILE_ENTRY)
558 {
559 lastblock = last[i];
560 UDF_SB_ANCHOR(sb)[2] = 512 + UDF_SB_SESSION(sb);
561 }
562 else
563 {
564 if (!(bh = bread(sb->s_dev, last[i] - 256, sb->s_blocksize)))
565 {
566 ident = location = 0;
567 }
568 else
569 {
570 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
571 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
572 udf_release_data(bh);
573 }
574
575 if (ident == TID_ANCHOR_VOL_DESC_PTR &&
576 location == last[i] - 256 - UDF_SB_SESSION(sb))
577 {
578 lastblock = last[i];
579 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
580 }
581 else
582 {
583 if (!(bh = bread(sb->s_dev, last[i] - 312 - UDF_SB_SESSION(sb),
584 sb->s_blocksize)))
585 {
586 ident = location = 0;
587 }
588 else
589 {
590 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
591 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
592 udf_release_data(bh);
593 }
594
595 if (ident == TID_ANCHOR_VOL_DESC_PTR &&
596 location == udf_variable_to_fixed(last[i]) - 256)
597 {
598 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
599 lastblock = udf_variable_to_fixed(last[i]);
600 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
601 }
602 }
603 }
604 }
605
606 if (!lastblock)
607 {
608 /* We havn't found the lastblock. check 312 */
609 if ((bh = bread(sb->s_dev, 312 + UDF_SB_SESSION(sb), sb->s_blocksize)))
610 {
611 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
612 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
613 udf_release_data(bh);
614
615 if (ident == TID_ANCHOR_VOL_DESC_PTR && location == 256)
616 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
617 }
618 }
619
620 for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
621 {
622 if (UDF_SB_ANCHOR(sb)[i])
623 {
624 if (!(bh = udf_read_tagged(sb,
625 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
626 {
627 UDF_SB_ANCHOR(sb)[i] = 0;
628 }
629 else
630 {
631 udf_release_data(bh);
632 if ((ident != TID_ANCHOR_VOL_DESC_PTR) && (i ||
633 (ident != TID_FILE_ENTRY && ident != TID_EXTENDED_FILE_ENTRY)))
634 {
635 UDF_SB_ANCHOR(sb)[i] = 0;
636 }
637 }
638 }
639 else if (useranchor != 0xFFFFFFFF)
640 {
641 UDF_SB_ANCHOR(sb)[i] = useranchor;
642 useranchor = 0xFFFFFFFF;
643 i --;
644 }
645 }
646
647 return lastblock;
648 }
649
650 static int
651 udf_find_fileset(struct super_block *sb, lb_addr *fileset, lb_addr *root)
652 {
653 struct buffer_head *bh = NULL;
654 long lastblock;
655 Uint16 ident;
656
657 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
658 fileset->partitionReferenceNum != 0xFFFF)
659 {
660 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
661
662 if (!bh)
663 return 1;
664 else if (ident != TID_FILE_SET_DESC)
665 {
666 udf_release_data(bh);
667 return 1;
668 }
669
670 }
671
672 if (!bh) /* Search backwards through the partitions */
673 {
674 lb_addr newfileset;
675
676 return 1;
677
678 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
679 (newfileset.partitionReferenceNum != 0xFFFF &&
680 fileset->logicalBlockNum == 0xFFFFFFFF &&
681 fileset->partitionReferenceNum == 0xFFFF);
682 newfileset.partitionReferenceNum--)
683 {
684 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
685 newfileset.logicalBlockNum = 0;
686
687 do
688 {
689 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
690 if (!bh)
691 {
692 newfileset.logicalBlockNum ++;
693 continue;
694 }
695
696 switch (ident)
697 {
698 case TID_SPACE_BITMAP_DESC:
699 {
700 struct SpaceBitmapDesc *sp;
701 sp = (struct SpaceBitmapDesc *)bh->b_data;
702 newfileset.logicalBlockNum += 1 +
703 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct SpaceBitmapDesc) - 1)
704 >> sb->s_blocksize_bits);
705 udf_release_data(bh);
706 break;
707 }
708 case TID_FILE_SET_DESC:
709 {
710 *fileset = newfileset;
711 break;
712 }
713 default:
714 {
715 newfileset.logicalBlockNum ++;
716 udf_release_data(bh);
717 bh = NULL;
718 break;
719 }
720 }
721 }
722 while (newfileset.logicalBlockNum < lastblock &&
723 fileset->logicalBlockNum == 0xFFFFFFFF &&
724 fileset->partitionReferenceNum == 0xFFFF);
725 }
726 }
727
728 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
729 fileset->partitionReferenceNum != 0xFFFF) && bh)
730 {
731 udf_debug("Fileset at block=%d, partition=%d\n",
732 fileset->logicalBlockNum, fileset->partitionReferenceNum);
733
734 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
735 udf_load_fileset(sb, bh, root);
736 udf_release_data(bh);
737 return 0;
738 }
739 return 1;
740 }
741
742 static void
743 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
744 {
745 struct PrimaryVolDesc *pvoldesc;
746 time_t recording;
747 long recording_usec;
748 struct ustr instr;
749 struct ustr outstr;
750
751 pvoldesc = (struct PrimaryVolDesc *)bh->b_data;
752
753 if ( udf_stamp_to_time(&recording, &recording_usec,
754 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
755 {
756 timestamp ts;
757 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
758 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
759 recording, recording_usec,
760 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
761 UDF_SB_RECORDTIME(sb) = recording;
762 }
763
764 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
765 {
766 if (udf_CS0toUTF8(&outstr, &instr))
767 {
768 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
769 outstr.u_len > 31 ? 31 : outstr.u_len);
770 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
771 }
772 }
773
774 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
775 {
776 if (udf_CS0toUTF8(&outstr, &instr))
777 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
778 }
779 }
780
781 static void
782 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, lb_addr *root)
783 {
784 struct FileSetDesc *fset;
785
786 fset = (struct FileSetDesc *)bh->b_data;
787
788 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
789
790 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
791
792 udf_debug("Rootdir at block=%d, partition=%d\n",
793 root->logicalBlockNum, root->partitionReferenceNum);
794 }
795
796 static void
797 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
798 {
799 struct PartitionDesc *p;
800 int i;
801
802 p = (struct PartitionDesc *)bh->b_data;
803
804 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
805 {
806 udf_debug("Searching map: (%d == %d)\n",
807 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
808 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
809 {
810 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
811 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation) + UDF_SB_SESSION(sb);
812
813 if (!strcmp(p->partitionContents.ident, PARTITION_CONTENTS_NSR02) ||
814 !strcmp(p->partitionContents.ident, PARTITION_CONTENTS_NSR03))
815 {
816 struct PartitionHeaderDesc *phd;
817
818 phd = (struct PartitionHeaderDesc *)(p->partitionContentsUse);
819 if (phd->unallocatedSpaceTable.extLength)
820 {
821 lb_addr loc = { le32_to_cpu(phd->unallocatedSpaceTable.extPosition), i };
822
823 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
824 udf_iget(sb, loc);
825 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
826 udf_debug("unallocatedSpaceTable (part %d) @ %ld\n",
827 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
828 }
829 if (phd->unallocatedSpaceBitmap.extLength)
830 {
831 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
832 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
833 {
834 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
835 le32_to_cpu(phd->unallocatedSpaceBitmap.extLength);
836 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
837 le32_to_cpu(phd->unallocatedSpaceBitmap.extPosition);
838 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
839 udf_debug("unallocatedSpaceBitmap (part %d) @ %d\n",
840 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
841 }
842 }
843 if (phd->partitionIntegrityTable.extLength)
844 udf_debug("partitionIntegrityTable (part %d)\n", i);
845 if (phd->freedSpaceTable.extLength)
846 {
847 lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
848
849 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
850 udf_iget(sb, loc);
851 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
852 udf_debug("freedSpaceTable (part %d) @ %ld\n",
853 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
854 }
855 if (phd->freedSpaceBitmap.extLength)
856 {
857 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
858 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
859 {
860 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
861 le32_to_cpu(phd->freedSpaceBitmap.extLength);
862 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
863 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
864 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
865 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
866 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
867 }
868 }
869 }
870 break;
871 }
872 }
873 if (i == UDF_SB_NUMPARTS(sb))
874 {
875 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
876 }
877 else
878 {
879 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
880 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
881 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
882 }
883 }
884
885 static int
886 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, lb_addr *fileset)
887 {
888 struct LogicalVolDesc *lvd;
889 int i, j, offset;
890 Uint8 type;
891
892 lvd = (struct LogicalVolDesc *)bh->b_data;
893
894 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
895
896 for (i=0,offset=0;
897 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
898 i++,offset+=((struct GenericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
899 {
900 type = ((struct GenericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
901 if (type == 1)
902 {
903 struct GenericPartitionMap1 *gpm1 = (struct GenericPartitionMap1 *)&(lvd->partitionMaps[offset]);
904 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
905 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
906 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
907 UDF_SB_PARTFUNC(sb,i) = NULL;
908 }
909 else if (type == 2)
910 {
911 struct UdfPartitionMap2 *upm2 = (struct UdfPartitionMap2 *)&(lvd->partitionMaps[offset]);
912 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
913 {
914 if (le16_to_cpu(((Uint16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
915 {
916 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
917 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
918 }
919 else if (le16_to_cpu(((Uint16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
920 {
921 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
922 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
923 }
924 }
925 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
926 {
927 Uint32 loc;
928 Uint16 ident;
929 struct SparingTable *st;
930 struct SparablePartitionMap *spm = (struct SparablePartitionMap *)&(lvd->partitionMaps[offset]);
931
932 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
933 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
934 for (j=0; j<spm->numSparingTables; j++)
935 {
936 loc = le32_to_cpu(spm->locSparingTable[j]);
937 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
938 udf_read_tagged(sb, loc, loc, &ident);
939 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
940 {
941 st = (struct SparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
942 if (ident != 0 ||
943 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
944 {
945 udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
946 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
947 }
948 }
949 }
950 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
951 }
952 else
953 {
954 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
955 continue;
956 }
957 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
958 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
959 }
960 udf_debug("Partition (%d:%d) type %d on volume %d\n",
961 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
962 }
963
964 if (fileset)
965 {
966 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
967
968 *fileset = lelb_to_cpu(la->extLocation);
969 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
970 fileset->logicalBlockNum,
971 fileset->partitionReferenceNum);
972 }
973 if (lvd->integritySeqExt.extLength)
974 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
975 return 0;
976 }
977
978 /*
979 * udf_load_logicalvolint
980 *
981 */
982 static void
983 udf_load_logicalvolint(struct super_block *sb, extent_ad loc)
984 {
985 struct buffer_head *bh = NULL;
986 Uint16 ident;
987
988 while ((bh = udf_read_tagged(sb, loc.extLocation, loc.extLocation, &ident)) &&
989 ident == TID_LOGICAL_VOL_INTEGRITY_DESC && loc.extLength > 0)
990 {
991 UDF_SB_LVIDBH(sb) = bh;
992
993 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
994 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
995
996 if (UDF_SB_LVIDBH(sb) != bh)
997 udf_release_data(bh);
998 loc.extLength -= sb->s_blocksize;
999 loc.extLocation ++;
1000 }
1001 if (UDF_SB_LVIDBH(sb) != bh)
1002 udf_release_data(bh);
1003 }
1004
1005 /*
1006 * udf_process_sequence
1007 *
1008 * PURPOSE
1009 * Process a main/reserve volume descriptor sequence.
1010 *
1011 * PRE-CONDITIONS
1012 * sb Pointer to _locked_ superblock.
1013 * block First block of first extent of the sequence.
1014 * lastblock Lastblock of first extent of the sequence.
1015 *
1016 * HISTORY
1017 * July 1, 1997 - Andrew E. Mileski
1018 * Written, tested, and released.
1019 */
1020 static int
1021 udf_process_sequence(struct super_block *sb, long block, long lastblock, lb_addr *fileset)
1022 {
1023 struct buffer_head *bh = NULL;
1024 struct udf_vds_record vds[VDS_POS_LENGTH];
1025 struct GenericDesc *gd;
1026 struct VolDescPtr *vdp;
1027 int done=0;
1028 int i,j;
1029 Uint32 vdsn;
1030 Uint16 ident;
1031 long next_s = 0, next_e = 0;
1032
1033 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1034
1035 /* Read the main descriptor sequence */
1036 for (;(!done && block <= lastblock); block++)
1037 {
1038
1039 bh = udf_read_tagged(sb, block, block, &ident);
1040 if (!bh)
1041 break;
1042
1043 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1044 gd = (struct GenericDesc *)bh->b_data;
1045 vdsn = le32_to_cpu(gd->volDescSeqNum);
1046 switch (ident)
1047 {
1048 case TID_PRIMARY_VOL_DESC: /* ISO 13346 3/10.1 */
1049 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1050 {
1051 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1052 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1053 }
1054 break;
1055 case TID_VOL_DESC_PTR: /* ISO 13346 3/10.3 */
1056 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1057 {
1058 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1059 vds[VDS_POS_VOL_DESC_PTR].block = block;
1060
1061 vdp = (struct VolDescPtr *)bh->b_data;
1062 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1063 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1064 next_e = next_e >> sb->s_blocksize_bits;
1065 next_e += next_s;
1066 }
1067 break;
1068 case TID_IMP_USE_VOL_DESC: /* ISO 13346 3/10.4 */
1069 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1070 {
1071 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1072 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1073 }
1074 break;
1075 case TID_PARTITION_DESC: /* ISO 13346 3/10.5 */
1076 if (!vds[VDS_POS_PARTITION_DESC].block)
1077 vds[VDS_POS_PARTITION_DESC].block = block;
1078 break;
1079 case TID_LOGICAL_VOL_DESC: /* ISO 13346 3/10.6 */
1080 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1081 {
1082 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1083 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1084 }
1085 break;
1086 case TID_UNALLOC_SPACE_DESC: /* ISO 13346 3/10.8 */
1087 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1088 {
1089 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1090 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1091 }
1092 break;
1093 case TID_TERMINATING_DESC: /* ISO 13346 3/10.9 */
1094 vds[VDS_POS_TERMINATING_DESC].block = block;
1095 if (next_e)
1096 {
1097 block = next_s;
1098 lastblock = next_e;
1099 next_s = next_e = 0;
1100 }
1101 else
1102 done = 1;
1103 break;
1104 }
1105 udf_release_data(bh);
1106 }
1107 for (i=0; i<VDS_POS_LENGTH; i++)
1108 {
1109 if (vds[i].block)
1110 {
1111 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1112
1113 if (i == VDS_POS_PRIMARY_VOL_DESC)
1114 udf_load_pvoldesc(sb, bh);
1115 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1116 udf_load_logicalvol(sb, bh, fileset);
1117 else if (i == VDS_POS_PARTITION_DESC)
1118 {
1119 struct buffer_head *bh2 = NULL;
1120 udf_load_partdesc(sb, bh);
1121 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1122 {
1123 bh2 = udf_read_tagged(sb, j, j, &ident);
1124 gd = (struct GenericDesc *)bh2->b_data;
1125 if (ident == TID_PARTITION_DESC)
1126 udf_load_partdesc(sb, bh2);
1127 udf_release_data(bh2);
1128 }
1129 }
1130 udf_release_data(bh);
1131 }
1132 }
1133
1134 return 0;
1135 }
1136
1137 /*
1138 * udf_check_valid()
1139 */
1140 static int
1141 udf_check_valid(struct super_block *sb, int novrs, int silent)
1142 {
1143 long block;
1144
1145 if (novrs)
1146 {
1147 udf_debug("Validity check skipped because of novrs option\n");
1148 return 0;
1149 }
1150 /* Check that it is NSR02 compliant */
1151 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1152 else if ((block = udf_vrs(sb, silent)) == -1)
1153 {
1154 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1155 return 0;
1156 }
1157 else
1158 return !block;
1159 }
1160
1161 static int
1162 udf_load_partition(struct super_block *sb, lb_addr *fileset)
1163 {
1164 struct AnchorVolDescPtr *anchor;
1165 Uint16 ident;
1166 struct buffer_head *bh;
1167 long main_s, main_e, reserve_s, reserve_e;
1168 int i, j;
1169
1170 if (!sb)
1171 return 1;
1172
1173 for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
1174 {
1175 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1176 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1177 {
1178 anchor = (struct AnchorVolDescPtr *)bh->b_data;
1179
1180 /* Locate the main sequence */
1181 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1182 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1183 main_e = main_e >> sb->s_blocksize_bits;
1184 main_e += main_s;
1185
1186 /* Locate the reserve sequence */
1187 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1188 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1189 reserve_e = reserve_e >> sb->s_blocksize_bits;
1190 reserve_e += reserve_s;
1191
1192 udf_release_data(bh);
1193
1194 /* Process the main & reserve sequences */
1195 /* responsible for finding the PartitionDesc(s) */
1196 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1197 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1198 {
1199 break;
1200 }
1201 }
1202 }
1203
1204 if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
1205 {
1206 udf_debug("No Anchor block found\n");
1207 return 1;
1208 }
1209 else
1210 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1211
1212 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1213 {
1214 switch UDF_SB_PARTTYPE(sb, i)
1215 {
1216 case UDF_VIRTUAL_MAP15:
1217 case UDF_VIRTUAL_MAP20:
1218 {
1219 lb_addr ino;
1220
1221 if (!UDF_SB_LASTBLOCK(sb))
1222 {
1223 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1224 return 1;
1225 }
1226
1227 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1228 {
1229 if (j != i &&
1230 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1231 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1232 {
1233 ino.partitionReferenceNum = j;
1234 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1235 UDF_SB_PARTROOT(sb,j);
1236 break;
1237 }
1238 }
1239
1240 if (j == UDF_SB_NUMPARTS(sb))
1241 return 1;
1242
1243 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1244 return 1;
1245
1246 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1247 {
1248 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1249 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1250 }
1251 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1252 {
1253 struct buffer_head *bh = NULL;
1254 Uint32 pos;
1255
1256 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1257 bh = bread(sb->s_dev, pos, sb->s_blocksize);
1258 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1259 le16_to_cpu(((struct VirtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1260 udf_ext0_offset(UDF_SB_VAT(sb));
1261 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1262 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1263 udf_release_data(bh);
1264 }
1265 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1266 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1267 }
1268 }
1269 }
1270 return 0;
1271 }
1272
1273 static void udf_open_lvid(struct super_block *sb)
1274 {
1275 if (UDF_SB_LVIDBH(sb))
1276 {
1277 int i;
1278 timestamp cpu_time;
1279
1280 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1281 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1282 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME, CURRENT_UTIME))
1283 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1284 UDF_SB_LVID(sb)->integrityType = INTEGRITY_TYPE_OPEN;
1285
1286 UDF_SB_LVID(sb)->descTag.descCRC =
1287 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1288 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1289
1290 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1291 for (i=0; i<16; i++)
1292 if (i != 4)
1293 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1294 ((Uint8 *)&(UDF_SB_LVID(sb)->descTag))[i];
1295
1296 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1297 }
1298 }
1299
1300 static void udf_close_lvid(struct super_block *sb)
1301 {
1302 if (UDF_SB_LVIDBH(sb) &&
1303 UDF_SB_LVID(sb)->integrityType == INTEGRITY_TYPE_OPEN)
1304 {
1305 int i;
1306 timestamp cpu_time;
1307
1308 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1309 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1310 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME, CURRENT_UTIME))
1311 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1312 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1313 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1314 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1315 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1316 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1317 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1318 UDF_SB_LVID(sb)->integrityType = INTEGRITY_TYPE_CLOSE;
1319
1320 UDF_SB_LVID(sb)->descTag.descCRC =
1321 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1322 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1323
1324 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1325 for (i=0; i<16; i++)
1326 if (i != 4)
1327 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1328 ((Uint8 *)&(UDF_SB_LVID(sb)->descTag))[i];
1329
1330 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1331 }
1332 }
1333
1334 /*
1335 * udf_read_super
1336 *
1337 * PURPOSE
1338 * Complete the specified super block.
1339 *
1340 * PRE-CONDITIONS
1341 * sb Pointer to superblock to complete - never NULL.
1342 * sb->s_dev Device to read suberblock from.
1343 * options Pointer to mount options.
1344 * silent Silent flag.
1345 *
1346 * HISTORY
1347 * July 1, 1997 - Andrew E. Mileski
1348 * Written, tested, and released.
1349 */
1350 static struct super_block *
1351 udf_read_super(struct super_block *sb, void *options, int silent)
1352 {
1353 int i;
1354 struct inode *inode=NULL;
1355 struct udf_options uopt;
1356 lb_addr rootdir, fileset;
1357
1358 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB);
1359 uopt.uid = -1;
1360 uopt.gid = -1;
1361 uopt.umask = 0;
1362
1363 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1364
1365 #if UDFFS_RW != 1
1366 sb->s_flags |= MS_RDONLY;
1367 #endif
1368
1369 if (!udf_parse_options((char *)options, &uopt))
1370 goto error_out;
1371
1372 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1373 uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1374 {
1375 udf_error(sb, "udf_read_super",
1376 "utf8 cannot be combined with iocharset\n");
1377 goto error_out;
1378 }
1379 #ifdef CONFIG_NLS
1380 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1381 {
1382 uopt.nls_map = load_nls_default();
1383 if (!uopt.nls_map)
1384 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1385 else
1386 udf_debug("Using default NLS map\n");
1387 }
1388 #endif
1389 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1390 uopt.flags |= (1 << UDF_FLAG_UTF8);
1391
1392 fileset.logicalBlockNum = 0xFFFFFFFF;
1393 fileset.partitionReferenceNum = 0xFFFF;
1394
1395 UDF_SB(sb)->s_flags = uopt.flags;
1396 UDF_SB(sb)->s_uid = uopt.uid;
1397 UDF_SB(sb)->s_gid = uopt.gid;
1398 UDF_SB(sb)->s_umask = uopt.umask;
1399 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1400
1401 /* Set the block size for all transfers */
1402 if (!udf_set_blocksize(sb, uopt.blocksize))
1403 goto error_out;
1404
1405 if ( uopt.session == 0xFFFFFFFF )
1406 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1407 else
1408 UDF_SB_SESSION(sb) = uopt.session;
1409
1410 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1411
1412 if ( uopt.lastblock == 0xFFFFFFFF )
1413 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1414 else
1415 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1416
1417 UDF_SB_LASTBLOCK(sb) = udf_find_anchor(sb, uopt.anchor, UDF_SB_LASTBLOCK(sb));
1418
1419 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1420
1421 if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1422 {
1423 printk("UDF-fs: No VRS found\n");
1424 goto error_out;
1425 }
1426
1427 /* Fill in the rest of the superblock */
1428 sb->s_op = &udf_sb_ops;
1429 sb->dq_op = NULL;
1430 sb->s_dirt = 0;
1431 sb->s_magic = UDF_SUPER_MAGIC;
1432
1433 if (udf_load_partition(sb, &fileset))
1434 {
1435 printk("UDF-fs: No partition found (1)\n");
1436 goto error_out;
1437 }
1438
1439 if ( UDF_SB_LVIDBH(sb) )
1440 {
1441 Uint16 minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1442 Uint16 minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1443 /* Uint16 maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1444
1445 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1446 {
1447 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1448 UDF_SB_LVIDIU(sb)->minUDFReadRev, UDF_MAX_READ_VERSION);
1449 goto error_out;
1450 }
1451 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1452 {
1453 sb->s_flags |= MS_RDONLY;
1454 }
1455
1456 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1457
1458 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1459 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1460 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1461 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1462 }
1463
1464 if ( !UDF_SB_NUMPARTS(sb) )
1465 {
1466 printk("UDF-fs: No partition found (2)\n");
1467 goto error_out;
1468 }
1469
1470 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1471 {
1472 printk("UDF-fs: No fileset found\n");
1473 goto error_out;
1474 }
1475
1476 if (!silent)
1477 {
1478 timestamp ts;
1479 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb), 0);
1480 udf_info("UDF %s-%s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1481 UDFFS_VERSION, UDFFS_RW ? "rw" : "ro", UDFFS_DATE,
1482 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1483 ts.typeAndTimezone);
1484 }
1485 if (!(sb->s_flags & MS_RDONLY))
1486 udf_open_lvid(sb);
1487
1488 /* Assign the root inode */
1489 /* assign inodes by physical block number */
1490 /* perhaps it's not extensible enough, but for now ... */
1491 inode = udf_iget(sb, rootdir);
1492 if (!inode)
1493 {
1494 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1495 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1496 goto error_out;
1497 }
1498
1499 /* Allocate a dentry for the root inode */
1500 sb->s_root = d_alloc_root(inode);
1501 if (!sb->s_root)
1502 {
1503 printk("UDF-fs: Couldn't allocate root dentry\n");
1504 iput(inode);
1505 goto error_out;
1506 }
1507 sb->s_maxbytes = ~0ULL;
1508 return sb;
1509
1510 error_out:
1511 if (UDF_SB_VAT(sb))
1512 iput(UDF_SB_VAT(sb));
1513 if (UDF_SB_NUMPARTS(sb))
1514 {
1515 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1516 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1517 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1518 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1519 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1520 {
1521 for (i=0; i<UDF_SB_BITMAP_NR_GROUPS(sb,UDF_SB_PARTITION(sb),s_uspace); i++)
1522 {
1523 if (UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace,i))
1524 udf_release_data(UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace,i));
1525 }
1526 kfree(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1527 }
1528 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1529 {
1530 for (i=0; i<UDF_SB_BITMAP_NR_GROUPS(sb,UDF_SB_PARTITION(sb),s_fspace); i++)
1531 {
1532 if (UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace,i))
1533 udf_release_data(UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace,i));
1534 }
1535 kfree(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1536 }
1537 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1538 {
1539 for (i=0; i<4; i++)
1540 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1541 }
1542 }
1543 #ifdef CONFIG_NLS
1544 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1545 unload_nls(UDF_SB(sb)->s_nls_map);
1546 #endif
1547 if (!(sb->s_flags & MS_RDONLY))
1548 udf_close_lvid(sb);
1549 udf_release_data(UDF_SB_LVIDBH(sb));
1550 UDF_SB_FREE(sb);
1551 return NULL;
1552 }
1553
1554 void udf_error(struct super_block *sb, const char *function,
1555 const char *fmt, ...)
1556 {
1557 va_list args;
1558
1559 if (!(sb->s_flags & MS_RDONLY))
1560 {
1561 /* mark sb error */
1562 sb->s_dirt = 1;
1563 }
1564 va_start(args, fmt);
1565 vsprintf(error_buf, fmt, args);
1566 va_end(args);
1567 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1568 bdevname(sb->s_dev), function, error_buf);
1569 }
1570
1571 void udf_warning(struct super_block *sb, const char *function,
1572 const char *fmt, ...)
1573 {
1574 va_list args;
1575
1576 va_start (args, fmt);
1577 vsprintf(error_buf, fmt, args);
1578 va_end(args);
1579 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1580 bdevname(sb->s_dev), function, error_buf);
1581 }
1582
1583 /*
1584 * udf_put_super
1585 *
1586 * PURPOSE
1587 * Prepare for destruction of the superblock.
1588 *
1589 * DESCRIPTION
1590 * Called before the filesystem is unmounted.
1591 *
1592 * HISTORY
1593 * July 1, 1997 - Andrew E. Mileski
1594 * Written, tested, and released.
1595 */
1596 static void
1597 udf_put_super(struct super_block *sb)
1598 {
1599 int i;
1600
1601 if (UDF_SB_VAT(sb))
1602 iput(UDF_SB_VAT(sb));
1603 if (UDF_SB_NUMPARTS(sb))
1604 {
1605 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1606 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1607 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1608 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1609 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1610 {
1611 for (i=0; i<UDF_SB_BITMAP_NR_GROUPS(sb,UDF_SB_PARTITION(sb),s_uspace); i++)
1612 {
1613 if (UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace,i))
1614 udf_release_data(UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace,i));
1615 }
1616 kfree(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1617 }
1618 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1619 {
1620 for (i=0; i<UDF_SB_BITMAP_NR_GROUPS(sb,UDF_SB_PARTITION(sb),s_fspace); i++)
1621 {
1622 if (UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace,i))
1623 udf_release_data(UDF_SB_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace,i));
1624 }
1625 kfree(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1626 }
1627 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1628 {
1629 for (i=0; i<4; i++)
1630 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1631 }
1632 }
1633 #ifdef CONFIG_NLS
1634 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1635 unload_nls(UDF_SB(sb)->s_nls_map);
1636 #endif
1637 if (!(sb->s_flags & MS_RDONLY))
1638 udf_close_lvid(sb);
1639 udf_release_data(UDF_SB_LVIDBH(sb));
1640 UDF_SB_FREE(sb);
1641 }
1642
1643 /*
1644 * udf_stat_fs
1645 *
1646 * PURPOSE
1647 * Return info about the filesystem.
1648 *
1649 * DESCRIPTION
1650 * Called by sys_statfs()
1651 *
1652 * HISTORY
1653 * July 1, 1997 - Andrew E. Mileski
1654 * Written, tested, and released.
1655 */
1656 static int
1657 udf_statfs(struct super_block *sb, struct statfs *buf)
1658 {
1659 buf->f_type = UDF_SUPER_MAGIC;
1660 buf->f_bsize = sb->s_blocksize;
1661 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1662 buf->f_bfree = udf_count_free(sb);
1663 buf->f_bavail = buf->f_bfree;
1664 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1665 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1666 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1667 buf->f_ffree = buf->f_bfree;
1668 /* __kernel_fsid_t f_fsid */
1669 buf->f_namelen = UDF_NAME_LEN;
1670
1671 return 0;
1672 }
1673
1674 static unsigned char udf_bitmap_lookup[16] = {
1675 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1676 };
1677
1678 static unsigned int
1679 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1680 {
1681 struct buffer_head *bh = NULL;
1682 unsigned int accum = 0;
1683 int index;
1684 int block = 0, newblock;
1685 lb_addr loc;
1686 Uint32 bytes;
1687 Uint8 value;
1688 Uint8 *ptr;
1689 Uint16 ident;
1690 struct SpaceBitmapDesc *bm;
1691
1692 loc.logicalBlockNum = bitmap->s_extPosition;
1693 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1694 bh = udf_read_ptagged(sb, loc, 0, &ident);
1695
1696 if (!bh)
1697 {
1698 printk(KERN_ERR "udf: udf_count_free failed\n");
1699 return 0;
1700 }
1701 else if (ident != TID_SPACE_BITMAP_DESC)
1702 {
1703 udf_release_data(bh);
1704 printk(KERN_ERR "udf: udf_count_free failed\n");
1705 return 0;
1706 }
1707
1708 bm = (struct SpaceBitmapDesc *)bh->b_data;
1709 bytes = bm->numOfBytes;
1710 index = sizeof(struct SpaceBitmapDesc); /* offset in first block only */
1711 ptr = (Uint8 *)bh->b_data;
1712
1713 while ( bytes > 0 )
1714 {
1715 while ((bytes > 0) && (index < sb->s_blocksize))
1716 {
1717 value = ptr[index];
1718 accum += udf_bitmap_lookup[ value & 0x0f ];
1719 accum += udf_bitmap_lookup[ value >> 4 ];
1720 index++;
1721 bytes--;
1722 }
1723 if ( bytes )
1724 {
1725 udf_release_data(bh);
1726 newblock = udf_get_lb_pblock(sb, loc, ++block);
1727 bh = udf_tread(sb, newblock, sb->s_blocksize);
1728 if (!bh)
1729 {
1730 udf_debug("read failed\n");
1731 return accum;
1732 }
1733 index = 0;
1734 ptr = (Uint8 *)bh->b_data;
1735 }
1736 }
1737 udf_release_data(bh);
1738 return accum;
1739 }
1740
1741 static unsigned int
1742 udf_count_free_table(struct super_block *sb, struct inode * table)
1743 {
1744 unsigned int accum = 0;
1745 Uint32 extoffset, elen;
1746 lb_addr bloc, eloc;
1747 char etype;
1748 struct buffer_head *bh = NULL;
1749
1750 bloc = UDF_I_LOCATION(table);
1751 extoffset = sizeof(struct UnallocatedSpaceEntry);
1752
1753 while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1754 {
1755 accum += (elen >> table->i_sb->s_blocksize_bits);
1756 }
1757 udf_release_data(bh);
1758 return accum;
1759 }
1760
1761 static unsigned int
1762 udf_count_free(struct super_block *sb)
1763 {
1764 unsigned int accum = 0;
1765
1766 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1767 {
1768 accum += udf_count_free_bitmap(sb,
1769 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1770 }
1771 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1772 {
1773 accum += udf_count_free_bitmap(sb,
1774 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1775 }
1776 if (accum)
1777 return accum;
1778
1779 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1780 {
1781 accum += udf_count_free_table(sb,
1782 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1783 }
1784 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1785 {
1786 accum += udf_count_free_table(sb,
1787 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1788 }
1789 if (accum)
1790 return accum;
1791
1792 if (UDF_SB_LVIDBH(sb))
1793 {
1794 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1795 {
1796 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1797
1798 if (accum == 0xFFFFFFFF)
1799 accum = 0;
1800 }
1801 }
1802 return accum;
1803 }
1804