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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / fs / udf / super.c
blob1865c5a446d2f621c5336e3d5720302934aaccd6
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) 1998-2004 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/blkdev.h>
50 #include <linux/slab.h>
51 #include <linux/kernel.h>
52 #include <linux/module.h>
53 #include <linux/parser.h>
54 #include <linux/stat.h>
55 #include <linux/cdrom.h>
56 #include <linux/nls.h>
57 #include <linux/smp_lock.h>
58 #include <linux/buffer_head.h>
59 #include <linux/vfs.h>
60 #include <linux/vmalloc.h>
61 #include <asm/byteorder.h>
62
63 #include <linux/udf_fs.h>
64 #include "udf_sb.h"
65 #include "udf_i.h"
66
67 #include <linux/init.h>
68 #include <asm/uaccess.h>
69
70 #define VDS_POS_PRIMARY_VOL_DESC 0
71 #define VDS_POS_UNALLOC_SPACE_DESC 1
72 #define VDS_POS_LOGICAL_VOL_DESC 2
73 #define VDS_POS_PARTITION_DESC 3
74 #define VDS_POS_IMP_USE_VOL_DESC 4
75 #define VDS_POS_VOL_DESC_PTR 5
76 #define VDS_POS_TERMINATING_DESC 6
77 #define VDS_POS_LENGTH 7
78
79 static char error_buf[1024];
80
81 /* These are the "meat" - everything else is stuffing */
82 static int udf_fill_super(struct super_block *, void *, int);
83 static void udf_put_super(struct super_block *);
84 static void udf_write_super(struct super_block *);
85 static int udf_remount_fs(struct super_block *, int *, char *);
86 static int udf_check_valid(struct super_block *, int, int);
87 static int udf_vrs(struct super_block *sb, int silent);
88 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
89 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
90 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
91 static void udf_find_anchor(struct super_block *);
92 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
93 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
94 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
95 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
96 static void udf_open_lvid(struct super_block *);
97 static void udf_close_lvid(struct super_block *);
98 static unsigned int udf_count_free(struct super_block *);
99 static int udf_statfs(struct super_block *, struct kstatfs *);
100
101 /* UDF filesystem type */
102 static struct super_block *udf_get_sb(struct file_system_type *fs_type,
103 int flags, const char *dev_name, void *data)
104 {
105 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super);
106 }
107
108 static struct file_system_type udf_fstype = {
109 .owner = THIS_MODULE,
110 .name = "udf",
111 .get_sb = udf_get_sb,
112 .kill_sb = kill_block_super,
113 .fs_flags = FS_REQUIRES_DEV,
114 };
115
116 static kmem_cache_t * udf_inode_cachep;
117
118 static struct inode *udf_alloc_inode(struct super_block *sb)
119 {
120 struct udf_inode_info *ei;
121 ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
122 if (!ei)
123 return NULL;
124 return &ei->vfs_inode;
125 }
126
127 static void udf_destroy_inode(struct inode *inode)
128 {
129 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
130 }
131
132 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
133 {
134 struct udf_inode_info *ei = (struct udf_inode_info *) foo;
135
136 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
137 SLAB_CTOR_CONSTRUCTOR)
138 {
139 ei->i_ext.i_data = NULL;
140 inode_init_once(&ei->vfs_inode);
141 }
142 }
143
144 static int init_inodecache(void)
145 {
146 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
147 sizeof(struct udf_inode_info),
148 0, SLAB_RECLAIM_ACCOUNT,
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 if (kmem_cache_destroy(udf_inode_cachep))
158 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
159 }
160
161 /* Superblock operations */
162 static struct super_operations udf_sb_ops = {
163 .alloc_inode = udf_alloc_inode,
164 .destroy_inode = udf_destroy_inode,
165 .read_inode = udf_read_inode,
166 .write_inode = udf_write_inode,
167 .put_inode = udf_put_inode,
168 .delete_inode = udf_delete_inode,
169 .clear_inode = udf_clear_inode,
170 .put_super = udf_put_super,
171 .write_super = udf_write_super,
172 .statfs = udf_statfs,
173 .remount_fs = udf_remount_fs,
174 };
175
176 struct udf_options
177 {
178 unsigned char novrs;
179 unsigned int blocksize;
180 unsigned int session;
181 unsigned int lastblock;
182 unsigned int anchor;
183 unsigned int volume;
184 unsigned short partition;
185 unsigned int fileset;
186 unsigned int rootdir;
187 unsigned int flags;
188 mode_t umask;
189 gid_t gid;
190 uid_t uid;
191 struct nls_table *nls_map;
192 };
193
194 static int __init init_udf_fs(void)
195 {
196 int err;
197 err = init_inodecache();
198 if (err)
199 goto out1;
200 err = register_filesystem(&udf_fstype);
201 if (err)
202 goto out;
203 return 0;
204 out:
205 destroy_inodecache();
206 out1:
207 return err;
208 }
209
210 static void __exit exit_udf_fs(void)
211 {
212 unregister_filesystem(&udf_fstype);
213 destroy_inodecache();
214 }
215
216 module_init(init_udf_fs)
217 module_exit(exit_udf_fs)
218
219 /*
220 * udf_parse_options
221 *
222 * PURPOSE
223 * Parse mount options.
224 *
225 * DESCRIPTION
226 * The following mount options are supported:
227 *
228 * gid= Set the default group.
229 * umask= Set the default umask.
230 * uid= Set the default user.
231 * bs= Set the block size.
232 * unhide Show otherwise hidden files.
233 * undelete Show deleted files in lists.
234 * adinicb Embed data in the inode (default)
235 * noadinicb Don't embed data in the inode
236 * shortad Use short ad's
237 * longad Use long ad's (default)
238 * nostrict Unset strict conformance
239 * iocharset= Set the NLS character set
240 *
241 * The remaining are for debugging and disaster recovery:
242 *
243 * novrs Skip volume sequence recognition
244 *
245 * The following expect a offset from 0.
246 *
247 * session= Set the CDROM session (default= last session)
248 * anchor= Override standard anchor location. (default= 256)
249 * volume= Override the VolumeDesc location. (unused)
250 * partition= Override the PartitionDesc location. (unused)
251 * lastblock= Set the last block of the filesystem/
252 *
253 * The following expect a offset from the partition root.
254 *
255 * fileset= Override the fileset block location. (unused)
256 * rootdir= Override the root directory location. (unused)
257 * WARNING: overriding the rootdir to a non-directory may
258 * yield highly unpredictable results.
259 *
260 * PRE-CONDITIONS
261 * options Pointer to mount options string.
262 * uopts Pointer to mount options variable.
263 *
264 * POST-CONDITIONS
265 * <return> 1 Mount options parsed okay.
266 * <return> 0 Error parsing mount options.
267 *
268 * HISTORY
269 * July 1, 1997 - Andrew E. Mileski
270 * Written, tested, and released.
271 */
272
273 enum {
274 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
275 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
276 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
277 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
278 Opt_rootdir, Opt_utf8, Opt_iocharset,
279 Opt_err
280 };
281
282 static match_table_t tokens = {
283 {Opt_novrs, "novrs"},
284 {Opt_nostrict, "nostrict"},
285 {Opt_bs, "bs=%u"},
286 {Opt_unhide, "unhide"},
287 {Opt_undelete, "undelete"},
288 {Opt_noadinicb, "noadinicb"},
289 {Opt_adinicb, "adinicb"},
290 {Opt_shortad, "shortad"},
291 {Opt_longad, "longad"},
292 {Opt_gid, "gid=%u"},
293 {Opt_uid, "uid=%u"},
294 {Opt_umask, "umask=%o"},
295 {Opt_session, "session=%u"},
296 {Opt_lastblock, "lastblock=%u"},
297 {Opt_anchor, "anchor=%u"},
298 {Opt_volume, "volume=%u"},
299 {Opt_partition, "partition=%u"},
300 {Opt_fileset, "fileset=%u"},
301 {Opt_rootdir, "rootdir=%u"},
302 {Opt_utf8, "utf8"},
303 {Opt_iocharset, "iocharset=%s"},
304 {Opt_err, NULL}
305 };
306
307 static int
308 udf_parse_options(char *options, struct udf_options *uopt)
309 {
310 char *p;
311 int option;
312
313 uopt->novrs = 0;
314 uopt->blocksize = 2048;
315 uopt->partition = 0xFFFF;
316 uopt->session = 0xFFFFFFFF;
317 uopt->lastblock = 0;
318 uopt->anchor = 0;
319 uopt->volume = 0xFFFFFFFF;
320 uopt->rootdir = 0xFFFFFFFF;
321 uopt->fileset = 0xFFFFFFFF;
322 uopt->nls_map = NULL;
323
324 if (!options)
325 return 1;
326
327 while ((p = strsep(&options, ",")) != NULL)
328 {
329 substring_t args[MAX_OPT_ARGS];
330 int token;
331 if (!*p)
332 continue;
333
334 token = match_token(p, tokens, args);
335 switch (token)
336 {
337 case Opt_novrs:
338 uopt->novrs = 1;
339 case Opt_bs:
340 if (match_int(&args[0], &option))
341 return 0;
342 uopt->blocksize = option;
343 break;
344 case Opt_unhide:
345 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
346 break;
347 case Opt_undelete:
348 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
349 break;
350 case Opt_noadinicb:
351 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
352 break;
353 case Opt_adinicb:
354 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
355 break;
356 case Opt_shortad:
357 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
358 break;
359 case Opt_longad:
360 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
361 break;
362 case Opt_gid:
363 if (match_int(args, &option))
364 return 0;
365 uopt->gid = option;
366 break;
367 case Opt_uid:
368 if (match_int(args, &option))
369 return 0;
370 uopt->uid = option;
371 break;
372 case Opt_umask:
373 if (match_octal(args, &option))
374 return 0;
375 uopt->umask = option;
376 break;
377 case Opt_nostrict:
378 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
379 break;
380 case Opt_session:
381 if (match_int(args, &option))
382 return 0;
383 uopt->session = option;
384 break;
385 case Opt_lastblock:
386 if (match_int(args, &option))
387 return 0;
388 uopt->lastblock = option;
389 break;
390 case Opt_anchor:
391 if (match_int(args, &option))
392 return 0;
393 uopt->anchor = option;
394 break;
395 case Opt_volume:
396 if (match_int(args, &option))
397 return 0;
398 uopt->volume = option;
399 break;
400 case Opt_partition:
401 if (match_int(args, &option))
402 return 0;
403 uopt->partition = option;
404 break;
405 case Opt_fileset:
406 if (match_int(args, &option))
407 return 0;
408 uopt->fileset = option;
409 break;
410 case Opt_rootdir:
411 if (match_int(args, &option))
412 return 0;
413 uopt->rootdir = option;
414 break;
415 case Opt_utf8:
416 uopt->flags |= (1 << UDF_FLAG_UTF8);
417 break;
418 #ifdef CONFIG_UDF_NLS
419 case Opt_iocharset:
420 uopt->nls_map = load_nls(args[0].from);
421 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
422 break;
423 #endif
424 default:
425 printk(KERN_ERR "udf: bad mount option \"%s\" "
426 "or missing value\n", p);
427 return 0;
428 }
429 }
430 return 1;
431 }
432
433 void
434 udf_write_super(struct super_block *sb)
435 {
436 lock_kernel();
437 if (!(sb->s_flags & MS_RDONLY))
438 udf_open_lvid(sb);
439 sb->s_dirt = 0;
440 unlock_kernel();
441 }
442
443 static int
444 udf_remount_fs(struct super_block *sb, int *flags, char *options)
445 {
446 struct udf_options uopt;
447
448 uopt.flags = UDF_SB(sb)->s_flags ;
449 uopt.uid = UDF_SB(sb)->s_uid ;
450 uopt.gid = UDF_SB(sb)->s_gid ;
451 uopt.umask = UDF_SB(sb)->s_umask ;
452
453 if ( !udf_parse_options(options, &uopt) )
454 return -EINVAL;
455
456 UDF_SB(sb)->s_flags = uopt.flags;
457 UDF_SB(sb)->s_uid = uopt.uid;
458 UDF_SB(sb)->s_gid = uopt.gid;
459 UDF_SB(sb)->s_umask = uopt.umask;
460
461 if (UDF_SB_LVIDBH(sb)) {
462 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
463 if (write_rev > UDF_MAX_WRITE_VERSION)
464 *flags |= MS_RDONLY;
465 }
466
467 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
468 return 0;
469 if (*flags & MS_RDONLY)
470 udf_close_lvid(sb);
471 else
472 udf_open_lvid(sb);
473
474 return 0;
475 }
476
477 /*
478 * udf_set_blocksize
479 *
480 * PURPOSE
481 * Set the block size to be used in all transfers.
482 *
483 * DESCRIPTION
484 * To allow room for a DMA transfer, it is best to guess big when unsure.
485 * This routine picks 2048 bytes as the blocksize when guessing. This
486 * should be adequate until devices with larger block sizes become common.
487 *
488 * Note that the Linux kernel can currently only deal with blocksizes of
489 * 512, 1024, 2048, 4096, and 8192 bytes.
490 *
491 * PRE-CONDITIONS
492 * sb Pointer to _locked_ superblock.
493 *
494 * POST-CONDITIONS
495 * sb->s_blocksize Blocksize.
496 * sb->s_blocksize_bits log2 of blocksize.
497 * <return> 0 Blocksize is valid.
498 * <return> 1 Blocksize is invalid.
499 *
500 * HISTORY
501 * July 1, 1997 - Andrew E. Mileski
502 * Written, tested, and released.
503 */
504 static int
505 udf_set_blocksize(struct super_block *sb, int bsize)
506 {
507 if (!sb_min_blocksize(sb, bsize)) {
508 udf_debug("Bad block size (%d)\n", bsize);
509 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
510 return 0;
511 }
512 return sb->s_blocksize;
513 }
514
515 static int
516 udf_vrs(struct super_block *sb, int silent)
517 {
518 struct volStructDesc *vsd = NULL;
519 int sector = 32768;
520 int sectorsize;
521 struct buffer_head *bh = NULL;
522 int iso9660=0;
523 int nsr02=0;
524 int nsr03=0;
525
526 /* Block size must be a multiple of 512 */
527 if (sb->s_blocksize & 511)
528 return 0;
529
530 if (sb->s_blocksize < sizeof(struct volStructDesc))
531 sectorsize = sizeof(struct volStructDesc);
532 else
533 sectorsize = sb->s_blocksize;
534
535 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
536
537 udf_debug("Starting at sector %u (%ld byte sectors)\n",
538 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
539 /* Process the sequence (if applicable) */
540 for (;!nsr02 && !nsr03; sector += sectorsize)
541 {
542 /* Read a block */
543 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
544 if (!bh)
545 break;
546
547 /* Look for ISO descriptors */
548 vsd = (struct volStructDesc *)(bh->b_data +
549 (sector & (sb->s_blocksize - 1)));
550
551 if (vsd->stdIdent[0] == 0)
552 {
553 udf_release_data(bh);
554 break;
555 }
556 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
557 {
558 iso9660 = sector;
559 switch (vsd->structType)
560 {
561 case 0:
562 udf_debug("ISO9660 Boot Record found\n");
563 break;
564 case 1:
565 udf_debug("ISO9660 Primary Volume Descriptor found\n");
566 break;
567 case 2:
568 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
569 break;
570 case 3:
571 udf_debug("ISO9660 Volume Partition Descriptor found\n");
572 break;
573 case 255:
574 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
575 break;
576 default:
577 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
578 break;
579 }
580 }
581 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
582 {
583 }
584 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
585 {
586 udf_release_data(bh);
587 break;
588 }
589 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
590 {
591 nsr02 = sector;
592 }
593 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
594 {
595 nsr03 = sector;
596 }
597 udf_release_data(bh);
598 }
599
600 if (nsr03)
601 return nsr03;
602 else if (nsr02)
603 return nsr02;
604 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
605 return -1;
606 else
607 return 0;
608 }
609
610 /*
611 * udf_find_anchor
612 *
613 * PURPOSE
614 * Find an anchor volume descriptor.
615 *
616 * PRE-CONDITIONS
617 * sb Pointer to _locked_ superblock.
618 * lastblock Last block on media.
619 *
620 * POST-CONDITIONS
621 * <return> 1 if not found, 0 if ok
622 *
623 * HISTORY
624 * July 1, 1997 - Andrew E. Mileski
625 * Written, tested, and released.
626 */
627 static void
628 udf_find_anchor(struct super_block *sb)
629 {
630 int lastblock = UDF_SB_LASTBLOCK(sb);
631 struct buffer_head *bh = NULL;
632 uint16_t ident;
633 uint32_t location;
634 int i;
635
636 if (lastblock)
637 {
638 int varlastblock = udf_variable_to_fixed(lastblock);
639 int last[] = { lastblock, lastblock - 2,
640 lastblock - 150, lastblock - 152,
641 varlastblock, varlastblock - 2,
642 varlastblock - 150, varlastblock - 152 };
643
644 lastblock = 0;
645
646 /* Search for an anchor volume descriptor pointer */
647
648 /* according to spec, anchor is in either:
649 * block 256
650 * lastblock-256
651 * lastblock
652 * however, if the disc isn't closed, it could be 512 */
653
654 for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
655 {
656 if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
657 {
658 ident = location = 0;
659 }
660 else
661 {
662 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
663 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
664 udf_release_data(bh);
665 }
666
667 if (ident == TAG_IDENT_AVDP)
668 {
669 if (location == last[i] - UDF_SB_SESSION(sb))
670 {
671 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
672 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
673 }
674 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
675 {
676 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
677 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
678 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
679 }
680 else
681 udf_debug("Anchor found at block %d, location mismatch %d.\n",
682 last[i], location);
683 }
684 else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
685 {
686 lastblock = last[i];
687 UDF_SB_ANCHOR(sb)[3] = 512;
688 }
689 else
690 {
691 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
692 {
693 ident = location = 0;
694 }
695 else
696 {
697 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
698 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
699 udf_release_data(bh);
700 }
701
702 if (ident == TAG_IDENT_AVDP &&
703 location == last[i] - 256 - UDF_SB_SESSION(sb))
704 {
705 lastblock = last[i];
706 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
707 }
708 else
709 {
710 if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
711 {
712 ident = location = 0;
713 }
714 else
715 {
716 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
717 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
718 udf_release_data(bh);
719 }
720
721 if (ident == TAG_IDENT_AVDP &&
722 location == udf_variable_to_fixed(last[i]) - 256)
723 {
724 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
725 lastblock = udf_variable_to_fixed(last[i]);
726 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
727 }
728 }
729 }
730 }
731 }
732
733 if (!lastblock)
734 {
735 /* We havn't found the lastblock. check 312 */
736 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
737 {
738 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
739 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
740 udf_release_data(bh);
741
742 if (ident == TAG_IDENT_AVDP && location == 256)
743 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
744 }
745 }
746
747 for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
748 {
749 if (UDF_SB_ANCHOR(sb)[i])
750 {
751 if (!(bh = udf_read_tagged(sb,
752 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
753 {
754 UDF_SB_ANCHOR(sb)[i] = 0;
755 }
756 else
757 {
758 udf_release_data(bh);
759 if ((ident != TAG_IDENT_AVDP) && (i ||
760 (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
761 {
762 UDF_SB_ANCHOR(sb)[i] = 0;
763 }
764 }
765 }
766 }
767
768 UDF_SB_LASTBLOCK(sb) = lastblock;
769 }
770
771 static int
772 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
773 {
774 struct buffer_head *bh = NULL;
775 long lastblock;
776 uint16_t ident;
777
778 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
779 fileset->partitionReferenceNum != 0xFFFF)
780 {
781 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
782
783 if (!bh)
784 return 1;
785 else if (ident != TAG_IDENT_FSD)
786 {
787 udf_release_data(bh);
788 return 1;
789 }
790
791 }
792
793 if (!bh) /* Search backwards through the partitions */
794 {
795 kernel_lb_addr newfileset;
796
797 return 1;
798
799 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
800 (newfileset.partitionReferenceNum != 0xFFFF &&
801 fileset->logicalBlockNum == 0xFFFFFFFF &&
802 fileset->partitionReferenceNum == 0xFFFF);
803 newfileset.partitionReferenceNum--)
804 {
805 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
806 newfileset.logicalBlockNum = 0;
807
808 do
809 {
810 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
811 if (!bh)
812 {
813 newfileset.logicalBlockNum ++;
814 continue;
815 }
816
817 switch (ident)
818 {
819 case TAG_IDENT_SBD:
820 {
821 struct spaceBitmapDesc *sp;
822 sp = (struct spaceBitmapDesc *)bh->b_data;
823 newfileset.logicalBlockNum += 1 +
824 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
825 >> sb->s_blocksize_bits);
826 udf_release_data(bh);
827 break;
828 }
829 case TAG_IDENT_FSD:
830 {
831 *fileset = newfileset;
832 break;
833 }
834 default:
835 {
836 newfileset.logicalBlockNum ++;
837 udf_release_data(bh);
838 bh = NULL;
839 break;
840 }
841 }
842 }
843 while (newfileset.logicalBlockNum < lastblock &&
844 fileset->logicalBlockNum == 0xFFFFFFFF &&
845 fileset->partitionReferenceNum == 0xFFFF);
846 }
847 }
848
849 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
850 fileset->partitionReferenceNum != 0xFFFF) && bh)
851 {
852 udf_debug("Fileset at block=%d, partition=%d\n",
853 fileset->logicalBlockNum, fileset->partitionReferenceNum);
854
855 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
856 udf_load_fileset(sb, bh, root);
857 udf_release_data(bh);
858 return 0;
859 }
860 return 1;
861 }
862
863 static void
864 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
865 {
866 struct primaryVolDesc *pvoldesc;
867 time_t recording;
868 long recording_usec;
869 struct ustr instr;
870 struct ustr outstr;
871
872 pvoldesc = (struct primaryVolDesc *)bh->b_data;
873
874 if ( udf_stamp_to_time(&recording, &recording_usec,
875 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
876 {
877 kernel_timestamp ts;
878 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
879 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
880 recording, recording_usec,
881 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
882 UDF_SB_RECORDTIME(sb).tv_sec = recording;
883 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
884 }
885
886 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
887 {
888 if (udf_CS0toUTF8(&outstr, &instr))
889 {
890 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
891 outstr.u_len > 31 ? 31 : outstr.u_len);
892 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
893 }
894 }
895
896 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
897 {
898 if (udf_CS0toUTF8(&outstr, &instr))
899 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
900 }
901 }
902
903 static void
904 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
905 {
906 struct fileSetDesc *fset;
907
908 fset = (struct fileSetDesc *)bh->b_data;
909
910 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
911
912 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
913
914 udf_debug("Rootdir at block=%d, partition=%d\n",
915 root->logicalBlockNum, root->partitionReferenceNum);
916 }
917
918 static void
919 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
920 {
921 struct partitionDesc *p;
922 int i;
923
924 p = (struct partitionDesc *)bh->b_data;
925
926 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
927 {
928 udf_debug("Searching map: (%d == %d)\n",
929 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
930 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
931 {
932 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
933 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
934 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
935 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
936 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
937 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
938 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
939 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
940 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
941 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
942
943 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
944 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
945 {
946 struct partitionHeaderDesc *phd;
947
948 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
949 if (phd->unallocSpaceTable.extLength)
950 {
951 kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
952
953 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
954 udf_iget(sb, loc);
955 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
956 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
957 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
958 }
959 if (phd->unallocSpaceBitmap.extLength)
960 {
961 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
962 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
963 {
964 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
965 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
966 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
967 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
968 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
969 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
970 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
971 }
972 }
973 if (phd->partitionIntegrityTable.extLength)
974 udf_debug("partitionIntegrityTable (part %d)\n", i);
975 if (phd->freedSpaceTable.extLength)
976 {
977 kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
978
979 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
980 udf_iget(sb, loc);
981 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
982 udf_debug("freedSpaceTable (part %d) @ %ld\n",
983 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
984 }
985 if (phd->freedSpaceBitmap.extLength)
986 {
987 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
988 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
989 {
990 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
991 le32_to_cpu(phd->freedSpaceBitmap.extLength);
992 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
993 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
994 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
995 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
996 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
997 }
998 }
999 }
1000 break;
1001 }
1002 }
1003 if (i == UDF_SB_NUMPARTS(sb))
1004 {
1005 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1006 }
1007 else
1008 {
1009 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1010 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1011 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1012 }
1013 }
1014
1015 static int
1016 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1017 {
1018 struct logicalVolDesc *lvd;
1019 int i, j, offset;
1020 uint8_t type;
1021
1022 lvd = (struct logicalVolDesc *)bh->b_data;
1023
1024 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1025
1026 for (i=0,offset=0;
1027 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1028 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1029 {
1030 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1031 if (type == 1)
1032 {
1033 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1034 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1035 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1036 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1037 UDF_SB_PARTFUNC(sb,i) = NULL;
1038 }
1039 else if (type == 2)
1040 {
1041 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1042 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1043 {
1044 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1045 {
1046 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1047 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1048 }
1049 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1050 {
1051 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1052 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1053 }
1054 }
1055 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1056 {
1057 uint32_t loc;
1058 uint16_t ident;
1059 struct sparingTable *st;
1060 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1061
1062 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1063 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1064 for (j=0; j<spm->numSparingTables; j++)
1065 {
1066 loc = le32_to_cpu(spm->locSparingTable[j]);
1067 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1068 udf_read_tagged(sb, loc, loc, &ident);
1069 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1070 {
1071 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1072 if (ident != 0 ||
1073 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1074 {
1075 udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1076 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1077 }
1078 }
1079 }
1080 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1081 }
1082 else
1083 {
1084 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1085 continue;
1086 }
1087 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1088 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1089 }
1090 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1091 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1092 }
1093
1094 if (fileset)
1095 {
1096 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1097
1098 *fileset = lelb_to_cpu(la->extLocation);
1099 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1100 fileset->logicalBlockNum,
1101 fileset->partitionReferenceNum);
1102 }
1103 if (lvd->integritySeqExt.extLength)
1104 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1105 return 0;
1106 }
1107
1108 /*
1109 * udf_load_logicalvolint
1110 *
1111 */
1112 static void
1113 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1114 {
1115 struct buffer_head *bh = NULL;
1116 uint16_t ident;
1117
1118 while (loc.extLength > 0 &&
1119 (bh = udf_read_tagged(sb, loc.extLocation,
1120 loc.extLocation, &ident)) &&
1121 ident == TAG_IDENT_LVID)
1122 {
1123 UDF_SB_LVIDBH(sb) = bh;
1124
1125 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1126 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1127
1128 if (UDF_SB_LVIDBH(sb) != bh)
1129 udf_release_data(bh);
1130 loc.extLength -= sb->s_blocksize;
1131 loc.extLocation ++;
1132 }
1133 if (UDF_SB_LVIDBH(sb) != bh)
1134 udf_release_data(bh);
1135 }
1136
1137 /*
1138 * udf_process_sequence
1139 *
1140 * PURPOSE
1141 * Process a main/reserve volume descriptor sequence.
1142 *
1143 * PRE-CONDITIONS
1144 * sb Pointer to _locked_ superblock.
1145 * block First block of first extent of the sequence.
1146 * lastblock Lastblock of first extent of the sequence.
1147 *
1148 * HISTORY
1149 * July 1, 1997 - Andrew E. Mileski
1150 * Written, tested, and released.
1151 */
1152 static int
1153 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1154 {
1155 struct buffer_head *bh = NULL;
1156 struct udf_vds_record vds[VDS_POS_LENGTH];
1157 struct generic_desc *gd;
1158 struct volDescPtr *vdp;
1159 int done=0;
1160 int i,j;
1161 uint32_t vdsn;
1162 uint16_t ident;
1163 long next_s = 0, next_e = 0;
1164
1165 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1166
1167 /* Read the main descriptor sequence */
1168 for (;(!done && block <= lastblock); block++)
1169 {
1170
1171 bh = udf_read_tagged(sb, block, block, &ident);
1172 if (!bh)
1173 break;
1174
1175 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1176 gd = (struct generic_desc *)bh->b_data;
1177 vdsn = le32_to_cpu(gd->volDescSeqNum);
1178 switch (ident)
1179 {
1180 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1181 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1182 {
1183 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1184 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1185 }
1186 break;
1187 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1188 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1189 {
1190 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1191 vds[VDS_POS_VOL_DESC_PTR].block = block;
1192
1193 vdp = (struct volDescPtr *)bh->b_data;
1194 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1195 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1196 next_e = next_e >> sb->s_blocksize_bits;
1197 next_e += next_s;
1198 }
1199 break;
1200 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1201 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1202 {
1203 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1204 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1205 }
1206 break;
1207 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1208 if (!vds[VDS_POS_PARTITION_DESC].block)
1209 vds[VDS_POS_PARTITION_DESC].block = block;
1210 break;
1211 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1212 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1213 {
1214 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1215 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1216 }
1217 break;
1218 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1219 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1220 {
1221 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1222 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1223 }
1224 break;
1225 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1226 vds[VDS_POS_TERMINATING_DESC].block = block;
1227 if (next_e)
1228 {
1229 block = next_s;
1230 lastblock = next_e;
1231 next_s = next_e = 0;
1232 }
1233 else
1234 done = 1;
1235 break;
1236 }
1237 udf_release_data(bh);
1238 }
1239 for (i=0; i<VDS_POS_LENGTH; i++)
1240 {
1241 if (vds[i].block)
1242 {
1243 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1244
1245 if (i == VDS_POS_PRIMARY_VOL_DESC)
1246 udf_load_pvoldesc(sb, bh);
1247 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1248 udf_load_logicalvol(sb, bh, fileset);
1249 else if (i == VDS_POS_PARTITION_DESC)
1250 {
1251 struct buffer_head *bh2 = NULL;
1252 udf_load_partdesc(sb, bh);
1253 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1254 {
1255 bh2 = udf_read_tagged(sb, j, j, &ident);
1256 gd = (struct generic_desc *)bh2->b_data;
1257 if (ident == TAG_IDENT_PD)
1258 udf_load_partdesc(sb, bh2);
1259 udf_release_data(bh2);
1260 }
1261 }
1262 udf_release_data(bh);
1263 }
1264 }
1265
1266 return 0;
1267 }
1268
1269 /*
1270 * udf_check_valid()
1271 */
1272 static int
1273 udf_check_valid(struct super_block *sb, int novrs, int silent)
1274 {
1275 long block;
1276
1277 if (novrs)
1278 {
1279 udf_debug("Validity check skipped because of novrs option\n");
1280 return 0;
1281 }
1282 /* Check that it is NSR02 compliant */
1283 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1284 else if ((block = udf_vrs(sb, silent)) == -1)
1285 {
1286 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1287 if (!UDF_SB_LASTBLOCK(sb))
1288 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1289 return 0;
1290 }
1291 else
1292 return !block;
1293 }
1294
1295 static int
1296 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1297 {
1298 struct anchorVolDescPtr *anchor;
1299 uint16_t ident;
1300 struct buffer_head *bh;
1301 long main_s, main_e, reserve_s, reserve_e;
1302 int i, j;
1303
1304 if (!sb)
1305 return 1;
1306
1307 for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
1308 {
1309 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1310 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1311 {
1312 anchor = (struct anchorVolDescPtr *)bh->b_data;
1313
1314 /* Locate the main sequence */
1315 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1316 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1317 main_e = main_e >> sb->s_blocksize_bits;
1318 main_e += main_s;
1319
1320 /* Locate the reserve sequence */
1321 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1322 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1323 reserve_e = reserve_e >> sb->s_blocksize_bits;
1324 reserve_e += reserve_s;
1325
1326 udf_release_data(bh);
1327
1328 /* Process the main & reserve sequences */
1329 /* responsible for finding the PartitionDesc(s) */
1330 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1331 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1332 {
1333 break;
1334 }
1335 }
1336 }
1337
1338 if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
1339 {
1340 udf_debug("No Anchor block found\n");
1341 return 1;
1342 }
1343 else
1344 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1345
1346 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1347 {
1348 switch UDF_SB_PARTTYPE(sb, i)
1349 {
1350 case UDF_VIRTUAL_MAP15:
1351 case UDF_VIRTUAL_MAP20:
1352 {
1353 kernel_lb_addr ino;
1354
1355 if (!UDF_SB_LASTBLOCK(sb))
1356 {
1357 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1358 udf_find_anchor(sb);
1359 }
1360
1361 if (!UDF_SB_LASTBLOCK(sb))
1362 {
1363 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1364 return 1;
1365 }
1366
1367 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1368 {
1369 if (j != i &&
1370 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1371 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1372 {
1373 ino.partitionReferenceNum = j;
1374 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1375 UDF_SB_PARTROOT(sb,j);
1376 break;
1377 }
1378 }
1379
1380 if (j == UDF_SB_NUMPARTS(sb))
1381 return 1;
1382
1383 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1384 return 1;
1385
1386 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1387 {
1388 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1389 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1390 }
1391 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1392 {
1393 struct buffer_head *bh = NULL;
1394 uint32_t pos;
1395
1396 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1397 bh = sb_bread(sb, pos);
1398 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1399 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1400 udf_ext0_offset(UDF_SB_VAT(sb));
1401 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1402 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1403 udf_release_data(bh);
1404 }
1405 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1406 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1407 }
1408 }
1409 }
1410 return 0;
1411 }
1412
1413 static void udf_open_lvid(struct super_block *sb)
1414 {
1415 if (UDF_SB_LVIDBH(sb))
1416 {
1417 int i;
1418 kernel_timestamp cpu_time;
1419
1420 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1421 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1422 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1423 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1424 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1425
1426 UDF_SB_LVID(sb)->descTag.descCRC =
1427 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1428 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1429
1430 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1431 for (i=0; i<16; i++)
1432 if (i != 4)
1433 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1434 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1435
1436 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1437 }
1438 }
1439
1440 static void udf_close_lvid(struct super_block *sb)
1441 {
1442 if (UDF_SB_LVIDBH(sb) &&
1443 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1444 {
1445 int i;
1446 kernel_timestamp cpu_time;
1447
1448 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1449 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1450 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1451 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1452 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1453 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1454 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1455 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1456 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1457 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1458 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1459
1460 UDF_SB_LVID(sb)->descTag.descCRC =
1461 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1462 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1463
1464 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1465 for (i=0; i<16; i++)
1466 if (i != 4)
1467 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1468 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1469
1470 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1471 }
1472 }
1473
1474 /*
1475 * udf_read_super
1476 *
1477 * PURPOSE
1478 * Complete the specified super block.
1479 *
1480 * PRE-CONDITIONS
1481 * sb Pointer to superblock to complete - never NULL.
1482 * sb->s_dev Device to read suberblock from.
1483 * options Pointer to mount options.
1484 * silent Silent flag.
1485 *
1486 * HISTORY
1487 * July 1, 1997 - Andrew E. Mileski
1488 * Written, tested, and released.
1489 */
1490 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1491 {
1492 int i;
1493 struct inode *inode=NULL;
1494 struct udf_options uopt;
1495 kernel_lb_addr rootdir, fileset;
1496 struct udf_sb_info *sbi;
1497
1498 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1499 uopt.uid = -1;
1500 uopt.gid = -1;
1501 uopt.umask = 0;
1502
1503 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1504 if (!sbi)
1505 return -ENOMEM;
1506 sb->s_fs_info = sbi;
1507 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1508
1509 if (!udf_parse_options((char *)options, &uopt))
1510 goto error_out;
1511
1512 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1513 uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1514 {
1515 udf_error(sb, "udf_read_super",
1516 "utf8 cannot be combined with iocharset\n");
1517 goto error_out;
1518 }
1519 #ifdef CONFIG_UDF_NLS
1520 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1521 {
1522 uopt.nls_map = load_nls_default();
1523 if (!uopt.nls_map)
1524 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1525 else
1526 udf_debug("Using default NLS map\n");
1527 }
1528 #endif
1529 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1530 uopt.flags |= (1 << UDF_FLAG_UTF8);
1531
1532 fileset.logicalBlockNum = 0xFFFFFFFF;
1533 fileset.partitionReferenceNum = 0xFFFF;
1534
1535 UDF_SB(sb)->s_flags = uopt.flags;
1536 UDF_SB(sb)->s_uid = uopt.uid;
1537 UDF_SB(sb)->s_gid = uopt.gid;
1538 UDF_SB(sb)->s_umask = uopt.umask;
1539 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1540
1541 /* Set the block size for all transfers */
1542 if (!udf_set_blocksize(sb, uopt.blocksize))
1543 goto error_out;
1544
1545 if ( uopt.session == 0xFFFFFFFF )
1546 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1547 else
1548 UDF_SB_SESSION(sb) = uopt.session;
1549
1550 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1551
1552 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1553 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1554 UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1555 UDF_SB_ANCHOR(sb)[3] = 256;
1556
1557 if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1558 {
1559 printk("UDF-fs: No VRS found\n");
1560 goto error_out;
1561 }
1562
1563 udf_find_anchor(sb);
1564
1565 /* Fill in the rest of the superblock */
1566 sb->s_op = &udf_sb_ops;
1567 sb->dq_op = NULL;
1568 sb->s_dirt = 0;
1569 sb->s_magic = UDF_SUPER_MAGIC;
1570
1571 if (udf_load_partition(sb, &fileset))
1572 {
1573 printk("UDF-fs: No partition found (1)\n");
1574 goto error_out;
1575 }
1576
1577 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1578
1579 if ( UDF_SB_LVIDBH(sb) )
1580 {
1581 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1582 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1583 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1584
1585 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1586 {
1587 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1588 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1589 UDF_MAX_READ_VERSION);
1590 goto error_out;
1591 }
1592 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1593 {
1594 sb->s_flags |= MS_RDONLY;
1595 }
1596
1597 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1598
1599 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1600 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1601 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1602 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1603 }
1604
1605 if ( !UDF_SB_NUMPARTS(sb) )
1606 {
1607 printk("UDF-fs: No partition found (2)\n");
1608 goto error_out;
1609 }
1610
1611 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1612 {
1613 printk("UDF-fs: No fileset found\n");
1614 goto error_out;
1615 }
1616
1617 if (!silent)
1618 {
1619 kernel_timestamp ts;
1620 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1621 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1622 UDFFS_VERSION, UDFFS_DATE,
1623 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1624 ts.typeAndTimezone);
1625 }
1626 if (!(sb->s_flags & MS_RDONLY))
1627 udf_open_lvid(sb);
1628
1629 /* Assign the root inode */
1630 /* assign inodes by physical block number */
1631 /* perhaps it's not extensible enough, but for now ... */
1632 inode = udf_iget(sb, rootdir);
1633 if (!inode)
1634 {
1635 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1636 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1637 goto error_out;
1638 }
1639
1640 /* Allocate a dentry for the root inode */
1641 sb->s_root = d_alloc_root(inode);
1642 if (!sb->s_root)
1643 {
1644 printk("UDF-fs: Couldn't allocate root dentry\n");
1645 iput(inode);
1646 goto error_out;
1647 }
1648 sb->s_maxbytes = MAX_LFS_FILESIZE;
1649 return 0;
1650
1651 error_out:
1652 if (UDF_SB_VAT(sb))
1653 iput(UDF_SB_VAT(sb));
1654 if (UDF_SB_NUMPARTS(sb))
1655 {
1656 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1657 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1658 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1659 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1660 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1661 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1662 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1663 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1664 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1665 {
1666 for (i=0; i<4; i++)
1667 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1668 }
1669 }
1670 #ifdef CONFIG_UDF_NLS
1671 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1672 unload_nls(UDF_SB(sb)->s_nls_map);
1673 #endif
1674 if (!(sb->s_flags & MS_RDONLY))
1675 udf_close_lvid(sb);
1676 udf_release_data(UDF_SB_LVIDBH(sb));
1677 UDF_SB_FREE(sb);
1678 kfree(sbi);
1679 sb->s_fs_info = NULL;
1680 return -EINVAL;
1681 }
1682
1683 void udf_error(struct super_block *sb, const char *function,
1684 const char *fmt, ...)
1685 {
1686 va_list args;
1687
1688 if (!(sb->s_flags & MS_RDONLY))
1689 {
1690 /* mark sb error */
1691 sb->s_dirt = 1;
1692 }
1693 va_start(args, fmt);
1694 vsprintf(error_buf, fmt, args);
1695 va_end(args);
1696 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1697 sb->s_id, function, error_buf);
1698 }
1699
1700 void udf_warning(struct super_block *sb, const char *function,
1701 const char *fmt, ...)
1702 {
1703 va_list args;
1704
1705 va_start (args, fmt);
1706 vsprintf(error_buf, fmt, args);
1707 va_end(args);
1708 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1709 sb->s_id, function, error_buf);
1710 }
1711
1712 /*
1713 * udf_put_super
1714 *
1715 * PURPOSE
1716 * Prepare for destruction of the superblock.
1717 *
1718 * DESCRIPTION
1719 * Called before the filesystem is unmounted.
1720 *
1721 * HISTORY
1722 * July 1, 1997 - Andrew E. Mileski
1723 * Written, tested, and released.
1724 */
1725 static void
1726 udf_put_super(struct super_block *sb)
1727 {
1728 int i;
1729
1730 if (UDF_SB_VAT(sb))
1731 iput(UDF_SB_VAT(sb));
1732 if (UDF_SB_NUMPARTS(sb))
1733 {
1734 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1735 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1736 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1737 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1738 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1739 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1740 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1741 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1742 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1743 {
1744 for (i=0; i<4; i++)
1745 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1746 }
1747 }
1748 #ifdef CONFIG_UDF_NLS
1749 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1750 unload_nls(UDF_SB(sb)->s_nls_map);
1751 #endif
1752 if (!(sb->s_flags & MS_RDONLY))
1753 udf_close_lvid(sb);
1754 udf_release_data(UDF_SB_LVIDBH(sb));
1755 UDF_SB_FREE(sb);
1756 kfree(sb->s_fs_info);
1757 sb->s_fs_info = NULL;
1758 }
1759
1760 /*
1761 * udf_stat_fs
1762 *
1763 * PURPOSE
1764 * Return info about the filesystem.
1765 *
1766 * DESCRIPTION
1767 * Called by sys_statfs()
1768 *
1769 * HISTORY
1770 * July 1, 1997 - Andrew E. Mileski
1771 * Written, tested, and released.
1772 */
1773 static int
1774 udf_statfs(struct super_block *sb, struct kstatfs *buf)
1775 {
1776 buf->f_type = UDF_SUPER_MAGIC;
1777 buf->f_bsize = sb->s_blocksize;
1778 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1779 buf->f_bfree = udf_count_free(sb);
1780 buf->f_bavail = buf->f_bfree;
1781 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1782 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1783 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1784 buf->f_ffree = buf->f_bfree;
1785 /* __kernel_fsid_t f_fsid */
1786 buf->f_namelen = UDF_NAME_LEN-2;
1787
1788 return 0;
1789 }
1790
1791 static unsigned char udf_bitmap_lookup[16] = {
1792 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1793 };
1794
1795 static unsigned int
1796 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1797 {
1798 struct buffer_head *bh = NULL;
1799 unsigned int accum = 0;
1800 int index;
1801 int block = 0, newblock;
1802 kernel_lb_addr loc;
1803 uint32_t bytes;
1804 uint8_t value;
1805 uint8_t *ptr;
1806 uint16_t ident;
1807 struct spaceBitmapDesc *bm;
1808
1809 lock_kernel();
1810
1811 loc.logicalBlockNum = bitmap->s_extPosition;
1812 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1813 bh = udf_read_ptagged(sb, loc, 0, &ident);
1814
1815 if (!bh)
1816 {
1817 printk(KERN_ERR "udf: udf_count_free failed\n");
1818 goto out;
1819 }
1820 else if (ident != TAG_IDENT_SBD)
1821 {
1822 udf_release_data(bh);
1823 printk(KERN_ERR "udf: udf_count_free failed\n");
1824 goto out;
1825 }
1826
1827 bm = (struct spaceBitmapDesc *)bh->b_data;
1828 bytes = le32_to_cpu(bm->numOfBytes);
1829 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1830 ptr = (uint8_t *)bh->b_data;
1831
1832 while ( bytes > 0 )
1833 {
1834 while ((bytes > 0) && (index < sb->s_blocksize))
1835 {
1836 value = ptr[index];
1837 accum += udf_bitmap_lookup[ value & 0x0f ];
1838 accum += udf_bitmap_lookup[ value >> 4 ];
1839 index++;
1840 bytes--;
1841 }
1842 if ( bytes )
1843 {
1844 udf_release_data(bh);
1845 newblock = udf_get_lb_pblock(sb, loc, ++block);
1846 bh = udf_tread(sb, newblock);
1847 if (!bh)
1848 {
1849 udf_debug("read failed\n");
1850 goto out;
1851 }
1852 index = 0;
1853 ptr = (uint8_t *)bh->b_data;
1854 }
1855 }
1856 udf_release_data(bh);
1857
1858 out:
1859 unlock_kernel();
1860
1861 return accum;
1862 }
1863
1864 static unsigned int
1865 udf_count_free_table(struct super_block *sb, struct inode * table)
1866 {
1867 unsigned int accum = 0;
1868 uint32_t extoffset, elen;
1869 kernel_lb_addr bloc, eloc;
1870 int8_t etype;
1871 struct buffer_head *bh = NULL;
1872
1873 lock_kernel();
1874
1875 bloc = UDF_I_LOCATION(table);
1876 extoffset = sizeof(struct unallocSpaceEntry);
1877
1878 while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1879 {
1880 accum += (elen >> table->i_sb->s_blocksize_bits);
1881 }
1882 udf_release_data(bh);
1883
1884 unlock_kernel();
1885
1886 return accum;
1887 }
1888
1889 static unsigned int
1890 udf_count_free(struct super_block *sb)
1891 {
1892 unsigned int accum = 0;
1893
1894 if (UDF_SB_LVIDBH(sb))
1895 {
1896 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1897 {
1898 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1899
1900 if (accum == 0xFFFFFFFF)
1901 accum = 0;
1902 }
1903 }
1904
1905 if (accum)
1906 return accum;
1907
1908 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1909 {
1910 accum += udf_count_free_bitmap(sb,
1911 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1912 }
1913 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1914 {
1915 accum += udf_count_free_bitmap(sb,
1916 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1917 }
1918 if (accum)
1919 return accum;
1920
1921 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1922 {
1923 accum += udf_count_free_table(sb,
1924 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1925 }
1926 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1927 {
1928 accum += udf_count_free_table(sb,
1929 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1930 }
1931
1932 return accum;
1933 }
MOXA 2.6.9 from sdlinux-moxaart.tgz