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[linux.git] / fs / udf / super.c
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1da177e4
LT		 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 * [email protected]
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
79static char error_buf[1024];
80
81/* These are the "meat" - everything else is stuffing */
82static int udf_fill_super(struct super_block *, void *, int);
83static void udf_put_super(struct super_block *);
84static void udf_write_super(struct super_block *);
85static int udf_remount_fs(struct super_block *, int *, char *);
86static int udf_check_valid(struct super_block *, int, int);
87static int udf_vrs(struct super_block *sb, int silent);
88static int udf_load_partition(struct super_block *, kernel_lb_addr *);
89static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
90static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
91static void udf_find_anchor(struct super_block *);
92static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
93static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
94static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
95static void udf_load_partdesc(struct super_block *, struct buffer_head *);
96static void udf_open_lvid(struct super_block *);
97static void udf_close_lvid(struct super_block *);
98static unsigned int udf_count_free(struct super_block *);
99static int udf_statfs(struct super_block *, struct kstatfs *);
100
101/* UDF filesystem type */
102static 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
108static 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
116static kmem_cache_t * udf_inode_cachep;
117
118static 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
127static void udf_destroy_inode(struct inode *inode)
128{
129 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
130}
131
132static 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
144static 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
155static 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 */
162static struct super_operations udf_sb_ops = {
163 .alloc_inode = udf_alloc_inode,
164 .destroy_inode = udf_destroy_inode,
165 .write_inode = udf_write_inode,
166 .delete_inode = udf_delete_inode,
167 .clear_inode = udf_clear_inode,
168 .put_super = udf_put_super,
169 .write_super = udf_write_super,
170 .statfs = udf_statfs,
171 .remount_fs = udf_remount_fs,
172};
173
174struct udf_options
175{
176 unsigned char novrs;
177 unsigned int blocksize;
178 unsigned int session;
179 unsigned int lastblock;
180 unsigned int anchor;
181 unsigned int volume;
182 unsigned short partition;
183 unsigned int fileset;
184 unsigned int rootdir;
185 unsigned int flags;
186 mode_t umask;
187 gid_t gid;
188 uid_t uid;
189 struct nls_table *nls_map;
190};
191
192static int __init init_udf_fs(void)
193{
194 int err;
195 err = init_inodecache();
196 if (err)
197 goto out1;
198 err = register_filesystem(&udf_fstype);
199 if (err)
200 goto out;
201 return 0;
202out:
203 destroy_inodecache();
204out1:
205 return err;
206}
207
208static void __exit exit_udf_fs(void)
209{
210 unregister_filesystem(&udf_fstype);
211 destroy_inodecache();
212}
213
214module_init(init_udf_fs)
215module_exit(exit_udf_fs)
216
217/*
218 * udf_parse_options
219 *
220 * PURPOSE
221 * Parse mount options.
222 *
223 * DESCRIPTION
224 * The following mount options are supported:
225 *
226 * gid= Set the default group.
227 * umask= Set the default umask.
228 * uid= Set the default user.
229 * bs= Set the block size.
230 * unhide Show otherwise hidden files.
231 * undelete Show deleted files in lists.
232 * adinicb Embed data in the inode (default)
233 * noadinicb Don't embed data in the inode
234 * shortad Use short ad's
235 * longad Use long ad's (default)
236 * nostrict Unset strict conformance
237 * iocharset= Set the NLS character set
238 *
239 * The remaining are for debugging and disaster recovery:
240 *
241 * novrs Skip volume sequence recognition
242 *
243 * The following expect a offset from 0.
244 *
245 * session= Set the CDROM session (default= last session)
246 * anchor= Override standard anchor location. (default= 256)
247 * volume= Override the VolumeDesc location. (unused)
248 * partition= Override the PartitionDesc location. (unused)
249 * lastblock= Set the last block of the filesystem/
250 *
251 * The following expect a offset from the partition root.
252 *
253 * fileset= Override the fileset block location. (unused)
254 * rootdir= Override the root directory location. (unused)
255 * WARNING: overriding the rootdir to a non-directory may
256 * yield highly unpredictable results.
257 *
258 * PRE-CONDITIONS
259 * options Pointer to mount options string.
260 * uopts Pointer to mount options variable.
261 *
262 * POST-CONDITIONS
263 * <return> 1 Mount options parsed okay.
264 * <return> 0 Error parsing mount options.
265 *
266 * HISTORY
267 * July 1, 1997 - Andrew E. Mileski
268 * Written, tested, and released.
269 */
270
271enum {
272 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
273 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
274 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
275 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
276 Opt_rootdir, Opt_utf8, Opt_iocharset,
277 Opt_err
278};
279
280static match_table_t tokens = {
281 {Opt_novrs, "novrs"},
282 {Opt_nostrict, "nostrict"},
283 {Opt_bs, "bs=%u"},
284 {Opt_unhide, "unhide"},
285 {Opt_undelete, "undelete"},
286 {Opt_noadinicb, "noadinicb"},
287 {Opt_adinicb, "adinicb"},
288 {Opt_shortad, "shortad"},
289 {Opt_longad, "longad"},
290 {Opt_gid, "gid=%u"},
291 {Opt_uid, "uid=%u"},
292 {Opt_umask, "umask=%o"},
293 {Opt_session, "session=%u"},
294 {Opt_lastblock, "lastblock=%u"},
295 {Opt_anchor, "anchor=%u"},
296 {Opt_volume, "volume=%u"},
297 {Opt_partition, "partition=%u"},
298 {Opt_fileset, "fileset=%u"},
299 {Opt_rootdir, "rootdir=%u"},
300 {Opt_utf8, "utf8"},
301 {Opt_iocharset, "iocharset=%s"},
302 {Opt_err, NULL}
303};
304
305static int
306udf_parse_options(char *options, struct udf_options *uopt)
307{
308 char *p;
309 int option;
310
311 uopt->novrs = 0;
312 uopt->blocksize = 2048;
313 uopt->partition = 0xFFFF;
314 uopt->session = 0xFFFFFFFF;
315 uopt->lastblock = 0;
316 uopt->anchor = 0;
317 uopt->volume = 0xFFFFFFFF;
318 uopt->rootdir = 0xFFFFFFFF;
319 uopt->fileset = 0xFFFFFFFF;
320 uopt->nls_map = NULL;
321
322 if (!options)
323 return 1;
324
325 while ((p = strsep(&options, ",")) != NULL)
326 {
327 substring_t args[MAX_OPT_ARGS];
328 int token;
329 if (!*p)
330 continue;
331
332 token = match_token(p, tokens, args);
333 switch (token)
334 {
335 case Opt_novrs:
336 uopt->novrs = 1;
337 case Opt_bs:
338 if (match_int(&args[0], &option))
339 return 0;
340 uopt->blocksize = option;
341 break;
342 case Opt_unhide:
343 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
344 break;
345 case Opt_undelete:
346 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
347 break;
348 case Opt_noadinicb:
349 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
350 break;
351 case Opt_adinicb:
352 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
353 break;
354 case Opt_shortad:
355 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
356 break;
357 case Opt_longad:
358 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
359 break;
360 case Opt_gid:
361 if (match_int(args, &option))
362 return 0;
363 uopt->gid = option;
364 break;
365 case Opt_uid:
366 if (match_int(args, &option))
367 return 0;
368 uopt->uid = option;
369 break;
370 case Opt_umask:
371 if (match_octal(args, &option))
372 return 0;
373 uopt->umask = option;
374 break;
375 case Opt_nostrict:
376 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
377 break;
378 case Opt_session:
379 if (match_int(args, &option))
380 return 0;
381 uopt->session = option;
382 break;
383 case Opt_lastblock:
384 if (match_int(args, &option))
385 return 0;
386 uopt->lastblock = option;
387 break;
388 case Opt_anchor:
389 if (match_int(args, &option))
390 return 0;
391 uopt->anchor = option;
392 break;
393 case Opt_volume:
394 if (match_int(args, &option))
395 return 0;
396 uopt->volume = option;
397 break;
398 case Opt_partition:
399 if (match_int(args, &option))
400 return 0;
401 uopt->partition = option;
402 break;
403 case Opt_fileset:
404 if (match_int(args, &option))
405 return 0;
406 uopt->fileset = option;
407 break;
408 case Opt_rootdir:
409 if (match_int(args, &option))
410 return 0;
411 uopt->rootdir = option;
412 break;
413 case Opt_utf8:
414 uopt->flags |= (1 << UDF_FLAG_UTF8);
415 break;
416#ifdef CONFIG_UDF_NLS
417 case Opt_iocharset:
418 uopt->nls_map = load_nls(args[0].from);
419 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
420 break;
421#endif
422 default:
423 printk(KERN_ERR "udf: bad mount option \"%s\" "
424 "or missing value\n", p);
425 return 0;
426 }
427 }
428 return 1;
429}
430
431void
432udf_write_super(struct super_block *sb)
433{
434 lock_kernel();
435 if (!(sb->s_flags & MS_RDONLY))
436 udf_open_lvid(sb);
437 sb->s_dirt = 0;
438 unlock_kernel();
439}
440
441static int
442udf_remount_fs(struct super_block *sb, int *flags, char *options)
443{
444 struct udf_options uopt;
445
446 uopt.flags = UDF_SB(sb)->s_flags ;
447 uopt.uid = UDF_SB(sb)->s_uid ;
448 uopt.gid = UDF_SB(sb)->s_gid ;
449 uopt.umask = UDF_SB(sb)->s_umask ;
450
451 if ( !udf_parse_options(options, &uopt) )
452 return -EINVAL;
453
454 UDF_SB(sb)->s_flags = uopt.flags;
455 UDF_SB(sb)->s_uid = uopt.uid;
456 UDF_SB(sb)->s_gid = uopt.gid;
457 UDF_SB(sb)->s_umask = uopt.umask;
458
459 if (UDF_SB_LVIDBH(sb)) {
460 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
461 if (write_rev > UDF_MAX_WRITE_VERSION)
462 *flags |= MS_RDONLY;
463 }
464
465 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
466 return 0;
467 if (*flags & MS_RDONLY)
468 udf_close_lvid(sb);
469 else
470 udf_open_lvid(sb);
471
472 return 0;
473}
474
475/*
476 * udf_set_blocksize
477 *
478 * PURPOSE
479 * Set the block size to be used in all transfers.
480 *
481 * DESCRIPTION
482 * To allow room for a DMA transfer, it is best to guess big when unsure.
483 * This routine picks 2048 bytes as the blocksize when guessing. This
484 * should be adequate until devices with larger block sizes become common.
485 *
486 * Note that the Linux kernel can currently only deal with blocksizes of
487 * 512, 1024, 2048, 4096, and 8192 bytes.
488 *
489 * PRE-CONDITIONS
490 * sb Pointer to _locked_ superblock.
491 *
492 * POST-CONDITIONS
493 * sb->s_blocksize Blocksize.
494 * sb->s_blocksize_bits log2 of blocksize.
495 * <return> 0 Blocksize is valid.
496 * <return> 1 Blocksize is invalid.
497 *
498 * HISTORY
499 * July 1, 1997 - Andrew E. Mileski
500 * Written, tested, and released.
501 */
502static int
503udf_set_blocksize(struct super_block *sb, int bsize)
504{
505 if (!sb_min_blocksize(sb, bsize)) {
506 udf_debug("Bad block size (%d)\n", bsize);
507 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
508 return 0;
509 }
510 return sb->s_blocksize;
511}
512
513static int
514udf_vrs(struct super_block *sb, int silent)
515{
516 struct volStructDesc *vsd = NULL;
517 int sector = 32768;
518 int sectorsize;
519 struct buffer_head *bh = NULL;
520 int iso9660=0;
521 int nsr02=0;
522 int nsr03=0;
523
524 /* Block size must be a multiple of 512 */
525 if (sb->s_blocksize & 511)
526 return 0;
527
528 if (sb->s_blocksize < sizeof(struct volStructDesc))
529 sectorsize = sizeof(struct volStructDesc);
530 else
531 sectorsize = sb->s_blocksize;
532
533 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
534
535 udf_debug("Starting at sector %u (%ld byte sectors)\n",
536 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
537 /* Process the sequence (if applicable) */
538 for (;!nsr02 && !nsr03; sector += sectorsize)
539 {
540 /* Read a block */
541 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
542 if (!bh)
543 break;
544
545 /* Look for ISO descriptors */
546 vsd = (struct volStructDesc *)(bh->b_data +
547 (sector & (sb->s_blocksize - 1)));
548
549 if (vsd->stdIdent[0] == 0)
550 {
551 udf_release_data(bh);
552 break;
553 }
554 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
555 {
556 iso9660 = sector;
557 switch (vsd->structType)
558 {
559 case 0:
560 udf_debug("ISO9660 Boot Record found\n");
561 break;
562 case 1:
563 udf_debug("ISO9660 Primary Volume Descriptor found\n");
564 break;
565 case 2:
566 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
567 break;
568 case 3:
569 udf_debug("ISO9660 Volume Partition Descriptor found\n");
570 break;
571 case 255:
572 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
573 break;
574 default:
575 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
576 break;
577 }
578 }
579 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
580 {
581 }
582 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
583 {
584 udf_release_data(bh);
585 break;
586 }
587 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
588 {
589 nsr02 = sector;
590 }
591 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
592 {
593 nsr03 = sector;
594 }
595 udf_release_data(bh);
596 }
597
598 if (nsr03)
599 return nsr03;
600 else if (nsr02)
601 return nsr02;
602 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
603 return -1;
604 else
605 return 0;
606}
607
608/*
609 * udf_find_anchor
610 *
611 * PURPOSE
612 * Find an anchor volume descriptor.
613 *
614 * PRE-CONDITIONS
615 * sb Pointer to _locked_ superblock.
616 * lastblock Last block on media.
617 *
618 * POST-CONDITIONS
619 * <return> 1 if not found, 0 if ok
620 *
621 * HISTORY
622 * July 1, 1997 - Andrew E. Mileski
623 * Written, tested, and released.
624 */
625static void
626udf_find_anchor(struct super_block *sb)
627{
628 int lastblock = UDF_SB_LASTBLOCK(sb);
629 struct buffer_head *bh = NULL;
630 uint16_t ident;
631 uint32_t location;
632 int i;
633
634 if (lastblock)
635 {
636 int varlastblock = udf_variable_to_fixed(lastblock);
637 int last[] = { lastblock, lastblock - 2,
638 lastblock - 150, lastblock - 152,
639 varlastblock, varlastblock - 2,
640 varlastblock - 150, varlastblock - 152 };
641
642 lastblock = 0;
643
644 /* Search for an anchor volume descriptor pointer */
645
646 /* according to spec, anchor is in either:
647 * block 256
648 * lastblock-256
649 * lastblock
650 * however, if the disc isn't closed, it could be 512 */
651
652 for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
653 {
654 if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
655 {
656 ident = location = 0;
657 }
658 else
659 {
660 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
661 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
662 udf_release_data(bh);
663 }
664
665 if (ident == TAG_IDENT_AVDP)
666 {
667 if (location == last[i] - UDF_SB_SESSION(sb))
668 {
669 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
670 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
671 }
672 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
673 {
674 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
675 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
676 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
677 }
678 else
679 udf_debug("Anchor found at block %d, location mismatch %d.\n",
680 last[i], location);
681 }
682 else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
683 {
684 lastblock = last[i];
685 UDF_SB_ANCHOR(sb)[3] = 512;
686 }
687 else
688 {
689 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
690 {
691 ident = location = 0;
692 }
693 else
694 {
695 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
696 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
697 udf_release_data(bh);
698 }
699
700 if (ident == TAG_IDENT_AVDP &&
701 location == last[i] - 256 - UDF_SB_SESSION(sb))
702 {
703 lastblock = last[i];
704 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
705 }
706 else
707 {
708 if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
709 {
710 ident = location = 0;
711 }
712 else
713 {
714 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
715 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
716 udf_release_data(bh);
717 }
718
719 if (ident == TAG_IDENT_AVDP &&
720 location == udf_variable_to_fixed(last[i]) - 256)
721 {
722 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
723 lastblock = udf_variable_to_fixed(last[i]);
724 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
725 }
726 }
727 }
728 }
729 }
730
731 if (!lastblock)
732 {
733 /* We havn't found the lastblock. check 312 */
734 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
735 {
736 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
737 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
738 udf_release_data(bh);
739
740 if (ident == TAG_IDENT_AVDP && location == 256)
741 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
742 }
743 }
744
745 for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
746 {
747 if (UDF_SB_ANCHOR(sb)[i])
748 {
749 if (!(bh = udf_read_tagged(sb,
750 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
751 {
752 UDF_SB_ANCHOR(sb)[i] = 0;
753 }
754 else
755 {
756 udf_release_data(bh);
757 if ((ident != TAG_IDENT_AVDP) && (i ||
758 (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
759 {
760 UDF_SB_ANCHOR(sb)[i] = 0;
761 }
762 }
763 }
764 }
765
766 UDF_SB_LASTBLOCK(sb) = lastblock;
767}
768
769static int
770udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
771{
772 struct buffer_head *bh = NULL;
773 long lastblock;
774 uint16_t ident;
775
776 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
777 fileset->partitionReferenceNum != 0xFFFF)
778 {
779 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
780
781 if (!bh)
782 return 1;
783 else if (ident != TAG_IDENT_FSD)
784 {
785 udf_release_data(bh);
786 return 1;
787 }
788
789 }
790
791 if (!bh) /* Search backwards through the partitions */
792 {
793 kernel_lb_addr newfileset;
794
795 return 1;
796
797 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
798 (newfileset.partitionReferenceNum != 0xFFFF &&
799 fileset->logicalBlockNum == 0xFFFFFFFF &&
800 fileset->partitionReferenceNum == 0xFFFF);
801 newfileset.partitionReferenceNum--)
802 {
803 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
804 newfileset.logicalBlockNum = 0;
805
806 do
807 {
808 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
809 if (!bh)
810 {
811 newfileset.logicalBlockNum ++;
812 continue;
813 }
814
815 switch (ident)
816 {
817 case TAG_IDENT_SBD:
818 {
819 struct spaceBitmapDesc *sp;
820 sp = (struct spaceBitmapDesc *)bh->b_data;
821 newfileset.logicalBlockNum += 1 +
822 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
823 >> sb->s_blocksize_bits);
824 udf_release_data(bh);
825 break;
826 }
827 case TAG_IDENT_FSD:
828 {
829 *fileset = newfileset;
830 break;
831 }
832 default:
833 {
834 newfileset.logicalBlockNum ++;
835 udf_release_data(bh);
836 bh = NULL;
837 break;
838 }
839 }
840 }
841 while (newfileset.logicalBlockNum < lastblock &&
842 fileset->logicalBlockNum == 0xFFFFFFFF &&
843 fileset->partitionReferenceNum == 0xFFFF);
844 }
845 }
846
847 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
848 fileset->partitionReferenceNum != 0xFFFF) && bh)
849 {
850 udf_debug("Fileset at block=%d, partition=%d\n",
851 fileset->logicalBlockNum, fileset->partitionReferenceNum);
852
853 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
854 udf_load_fileset(sb, bh, root);
855 udf_release_data(bh);
856 return 0;
857 }
858 return 1;
859}
860
861static void
862udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
863{
864 struct primaryVolDesc *pvoldesc;
865 time_t recording;
866 long recording_usec;
867 struct ustr instr;
868 struct ustr outstr;
869
870 pvoldesc = (struct primaryVolDesc *)bh->b_data;
871
872 if ( udf_stamp_to_time(&recording, &recording_usec,
873 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
874 {
875 kernel_timestamp ts;
876 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
877 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
878 recording, recording_usec,
879 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
880 UDF_SB_RECORDTIME(sb).tv_sec = recording;
881 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
882 }
883
884 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
885 {
886 if (udf_CS0toUTF8(&outstr, &instr))
887 {
888 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
889 outstr.u_len > 31 ? 31 : outstr.u_len);
890 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
891 }
892 }
893
894 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
895 {
896 if (udf_CS0toUTF8(&outstr, &instr))
897 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
898 }
899}
900
901static void
902udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
903{
904 struct fileSetDesc *fset;
905
906 fset = (struct fileSetDesc *)bh->b_data;
907
908 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
909
910 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
911
912 udf_debug("Rootdir at block=%d, partition=%d\n",
913 root->logicalBlockNum, root->partitionReferenceNum);
914}
915
916static void
917udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
918{
919 struct partitionDesc *p;
920 int i;
921
922 p = (struct partitionDesc *)bh->b_data;
923
924 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
925 {
926 udf_debug("Searching map: (%d == %d)\n",
927 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
928 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
929 {
930 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
931 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
932 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
933 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
934 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
935 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
936 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
937 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
938 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
939 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
940
941 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
942 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
943 {
944 struct partitionHeaderDesc *phd;
945
946 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
947 if (phd->unallocSpaceTable.extLength)
948 {
949 kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
950
951 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
952 udf_iget(sb, loc);
953 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
954 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
955 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
956 }
957 if (phd->unallocSpaceBitmap.extLength)
958 {
959 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
960 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
961 {
962 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
963 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
964 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
965 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
966 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
967 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
968 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
969 }
970 }
971 if (phd->partitionIntegrityTable.extLength)
972 udf_debug("partitionIntegrityTable (part %d)\n", i);
973 if (phd->freedSpaceTable.extLength)
974 {
975 kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
976
977 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
978 udf_iget(sb, loc);
979 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
980 udf_debug("freedSpaceTable (part %d) @ %ld\n",
981 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
982 }
983 if (phd->freedSpaceBitmap.extLength)
984 {
985 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
986 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
987 {
988 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
989 le32_to_cpu(phd->freedSpaceBitmap.extLength);
990 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
991 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
992 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
993 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
994 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
995 }
996 }
997 }
998 break;
999 }
1000 }
1001 if (i == UDF_SB_NUMPARTS(sb))
1002 {
1003 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1004 }
1005 else
1006 {
1007 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1008 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1009 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1010 }
1011}
1012
1013static int
1014udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1015{
1016 struct logicalVolDesc *lvd;
1017 int i, j, offset;
1018 uint8_t type;
1019
1020 lvd = (struct logicalVolDesc *)bh->b_data;
1021
1022 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1023
1024 for (i=0,offset=0;
1025 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1026 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1027 {
1028 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1029 if (type == 1)
1030 {
1031 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1032 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1033 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1034 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1035 UDF_SB_PARTFUNC(sb,i) = NULL;
1036 }
1037 else if (type == 2)
1038 {
1039 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1040 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1041 {
1042 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1043 {
1044 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1045 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1046 }
1047 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1048 {
1049 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1050 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1051 }
1052 }
1053 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1054 {
1055 uint32_t loc;
1056 uint16_t ident;
1057 struct sparingTable *st;
1058 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1059
1060 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1061 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1062 for (j=0; j<spm->numSparingTables; j++)
1063 {
1064 loc = le32_to_cpu(spm->locSparingTable[j]);
1065 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1066 udf_read_tagged(sb, loc, loc, &ident);
1067 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1068 {
1069 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1070 if (ident != 0 ||
1071 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1072 {
1073 udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1074 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1075 }
1076 }
1077 }
1078 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1079 }
1080 else
1081 {
1082 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1083 continue;
1084 }
1085 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1086 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1087 }
1088 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1089 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1090 }
1091
1092 if (fileset)
1093 {
1094 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1095
1096 *fileset = lelb_to_cpu(la->extLocation);
1097 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1098 fileset->logicalBlockNum,
1099 fileset->partitionReferenceNum);
1100 }
1101 if (lvd->integritySeqExt.extLength)
1102 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1103 return 0;
1104}
1105
1106/*
1107 * udf_load_logicalvolint
1108 *
1109 */
1110static void
1111udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1112{
1113 struct buffer_head *bh = NULL;
1114 uint16_t ident;
1115
1116 while (loc.extLength > 0 &&
1117 (bh = udf_read_tagged(sb, loc.extLocation,
1118 loc.extLocation, &ident)) &&
1119 ident == TAG_IDENT_LVID)
1120 {
1121 UDF_SB_LVIDBH(sb) = bh;
1122
1123 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1124 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1125
1126 if (UDF_SB_LVIDBH(sb) != bh)
1127 udf_release_data(bh);
1128 loc.extLength -= sb->s_blocksize;
1129 loc.extLocation ++;
1130 }
1131 if (UDF_SB_LVIDBH(sb) != bh)
1132 udf_release_data(bh);
1133}
1134
1135/*
1136 * udf_process_sequence
1137 *
1138 * PURPOSE
1139 * Process a main/reserve volume descriptor sequence.
1140 *
1141 * PRE-CONDITIONS
1142 * sb Pointer to _locked_ superblock.
1143 * block First block of first extent of the sequence.
1144 * lastblock Lastblock of first extent of the sequence.
1145 *
1146 * HISTORY
1147 * July 1, 1997 - Andrew E. Mileski
1148 * Written, tested, and released.
1149 */
1150static int
1151udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1152{
1153 struct buffer_head *bh = NULL;
1154 struct udf_vds_record vds[VDS_POS_LENGTH];
1155 struct generic_desc *gd;
1156 struct volDescPtr *vdp;
1157 int done=0;
1158 int i,j;
1159 uint32_t vdsn;
1160 uint16_t ident;
1161 long next_s = 0, next_e = 0;
1162
1163 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1164
1165 /* Read the main descriptor sequence */
1166 for (;(!done && block <= lastblock); block++)
1167 {
1168
1169 bh = udf_read_tagged(sb, block, block, &ident);
1170 if (!bh)
1171 break;
1172
1173 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1174 gd = (struct generic_desc *)bh->b_data;
1175 vdsn = le32_to_cpu(gd->volDescSeqNum);
1176 switch (ident)
1177 {
1178 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1179 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1180 {
1181 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1182 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1183 }
1184 break;
1185 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1186 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1187 {
1188 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1189 vds[VDS_POS_VOL_DESC_PTR].block = block;
1190
1191 vdp = (struct volDescPtr *)bh->b_data;
1192 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1193 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1194 next_e = next_e >> sb->s_blocksize_bits;
1195 next_e += next_s;
1196 }
1197 break;
1198 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1199 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1200 {
1201 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1202 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1203 }
1204 break;
1205 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1206 if (!vds[VDS_POS_PARTITION_DESC].block)
1207 vds[VDS_POS_PARTITION_DESC].block = block;
1208 break;
1209 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1210 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1211 {
1212 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1213 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1214 }
1215 break;
1216 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1217 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1218 {
1219 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1220 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1221 }
1222 break;
1223 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1224 vds[VDS_POS_TERMINATING_DESC].block = block;
1225 if (next_e)
1226 {
1227 block = next_s;
1228 lastblock = next_e;
1229 next_s = next_e = 0;
1230 }
1231 else
1232 done = 1;
1233 break;
1234 }
1235 udf_release_data(bh);
1236 }
1237 for (i=0; i<VDS_POS_LENGTH; i++)
1238 {
1239 if (vds[i].block)
1240 {
1241 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1242
1243 if (i == VDS_POS_PRIMARY_VOL_DESC)
1244 udf_load_pvoldesc(sb, bh);
1245 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1246 udf_load_logicalvol(sb, bh, fileset);
1247 else if (i == VDS_POS_PARTITION_DESC)
1248 {
1249 struct buffer_head *bh2 = NULL;
1250 udf_load_partdesc(sb, bh);
1251 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1252 {
1253 bh2 = udf_read_tagged(sb, j, j, &ident);
1254 gd = (struct generic_desc *)bh2->b_data;
1255 if (ident == TAG_IDENT_PD)
1256 udf_load_partdesc(sb, bh2);
1257 udf_release_data(bh2);
1258 }
1259 }
1260 udf_release_data(bh);
1261 }
1262 }
1263
1264 return 0;
1265}
1266
1267/*
1268 * udf_check_valid()
1269 */
1270static int
1271udf_check_valid(struct super_block *sb, int novrs, int silent)
1272{
1273 long block;
1274
1275 if (novrs)
1276 {
1277 udf_debug("Validity check skipped because of novrs option\n");
1278 return 0;
1279 }
1280 /* Check that it is NSR02 compliant */
1281 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1282 else if ((block = udf_vrs(sb, silent)) == -1)
1283 {
1284 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1285 if (!UDF_SB_LASTBLOCK(sb))
1286 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1287 return 0;
1288 }
1289 else
1290 return !block;
1291}
1292
1293static int
1294udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1295{
1296 struct anchorVolDescPtr *anchor;
1297 uint16_t ident;
1298 struct buffer_head *bh;
1299 long main_s, main_e, reserve_s, reserve_e;
1300 int i, j;
1301
1302 if (!sb)
1303 return 1;
1304
1305 for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
1306 {
1307 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1308 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1309 {
1310 anchor = (struct anchorVolDescPtr *)bh->b_data;
1311
1312 /* Locate the main sequence */
1313 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1314 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1315 main_e = main_e >> sb->s_blocksize_bits;
1316 main_e += main_s;
1317
1318 /* Locate the reserve sequence */
1319 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1320 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1321 reserve_e = reserve_e >> sb->s_blocksize_bits;
1322 reserve_e += reserve_s;
1323
1324 udf_release_data(bh);
1325
1326 /* Process the main & reserve sequences */
1327 /* responsible for finding the PartitionDesc(s) */
1328 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1329 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1330 {
1331 break;
1332 }
1333 }
1334 }
1335
1336 if (i == sizeof(UDF_SB_ANCHOR(sb))/sizeof(int))
1337 {
1338 udf_debug("No Anchor block found\n");
1339 return 1;
1340 }
1341 else
1342 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1343
1344 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1345 {
1346 switch UDF_SB_PARTTYPE(sb, i)
1347 {
1348 case UDF_VIRTUAL_MAP15:
1349 case UDF_VIRTUAL_MAP20:
1350 {
1351 kernel_lb_addr ino;
1352
1353 if (!UDF_SB_LASTBLOCK(sb))
1354 {
1355 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1356 udf_find_anchor(sb);
1357 }
1358
1359 if (!UDF_SB_LASTBLOCK(sb))
1360 {
1361 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1362 return 1;
1363 }
1364
1365 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1366 {
1367 if (j != i &&
1368 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1369 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1370 {
1371 ino.partitionReferenceNum = j;
1372 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1373 UDF_SB_PARTROOT(sb,j);
1374 break;
1375 }
1376 }
1377
1378 if (j == UDF_SB_NUMPARTS(sb))
1379 return 1;
1380
1381 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1382 return 1;
1383
1384 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1385 {
1386 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1387 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1388 }
1389 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1390 {
1391 struct buffer_head *bh = NULL;
1392 uint32_t pos;
1393
1394 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1395 bh = sb_bread(sb, pos);
1396 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1397 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1398 udf_ext0_offset(UDF_SB_VAT(sb));
1399 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1400 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1401 udf_release_data(bh);
1402 }
1403 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1404 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1405 }
1406 }
1407 }
1408 return 0;
1409}
1410
1411static void udf_open_lvid(struct super_block *sb)
1412{
1413 if (UDF_SB_LVIDBH(sb))
1414 {
1415 int i;
1416 kernel_timestamp cpu_time;
1417
1418 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1419 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1420 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1421 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1422 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1423
1424 UDF_SB_LVID(sb)->descTag.descCRC =
1425 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1426 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1427
1428 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1429 for (i=0; i<16; i++)
1430 if (i != 4)
1431 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1432 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1433
1434 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1435 }
1436}
1437
1438static void udf_close_lvid(struct super_block *sb)
1439{
1440 if (UDF_SB_LVIDBH(sb) &&
1441 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1442 {
1443 int i;
1444 kernel_timestamp cpu_time;
1445
1446 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1447 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1448 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1449 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1450 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1451 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1452 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1453 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1454 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1455 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1456 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1457
1458 UDF_SB_LVID(sb)->descTag.descCRC =
1459 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1460 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1461
1462 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1463 for (i=0; i<16; i++)
1464 if (i != 4)
1465 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1466 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1467
1468 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1469 }
1470}
1471
1472/*
1473 * udf_read_super
1474 *
1475 * PURPOSE
1476 * Complete the specified super block.
1477 *
1478 * PRE-CONDITIONS
1479 * sb Pointer to superblock to complete - never NULL.
1480 * sb->s_dev Device to read suberblock from.
1481 * options Pointer to mount options.
1482 * silent Silent flag.
1483 *
1484 * HISTORY
1485 * July 1, 1997 - Andrew E. Mileski
1486 * Written, tested, and released.
1487 */
1488static int udf_fill_super(struct super_block *sb, void *options, int silent)
1489{
1490 int i;
1491 struct inode *inode=NULL;
1492 struct udf_options uopt;
1493 kernel_lb_addr rootdir, fileset;
1494 struct udf_sb_info *sbi;
1495
1496 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1497 uopt.uid = -1;
1498 uopt.gid = -1;
1499 uopt.umask = 0;
1500
1501 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1502 if (!sbi)
1503 return -ENOMEM;
1504 sb->s_fs_info = sbi;
1505 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1506
1507 init_MUTEX(&sbi->s_alloc_sem);
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 sb->s_time_gran = 1000;
1571
1572 if (udf_load_partition(sb, &fileset))
1573 {
1574 printk("UDF-fs: No partition found (1)\n");
1575 goto error_out;
1576 }
1577
1578 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1579
1580 if ( UDF_SB_LVIDBH(sb) )
1581 {
1582 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1583 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1584 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1585
1586 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1587 {
1588 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1589 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1590 UDF_MAX_READ_VERSION);
1591 goto error_out;
1592 }
1593 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1594 {
1595 sb->s_flags |= MS_RDONLY;
1596 }
1597
1598 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1599
1600 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1601 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1602 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1603 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1604 }
1605
1606 if ( !UDF_SB_NUMPARTS(sb) )
1607 {
1608 printk("UDF-fs: No partition found (2)\n");
1609 goto error_out;
1610 }
1611
1612 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1613 {
1614 printk("UDF-fs: No fileset found\n");
1615 goto error_out;
1616 }
1617
1618 if (!silent)
1619 {
1620 kernel_timestamp ts;
1621 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1622 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1623 UDFFS_VERSION, UDFFS_DATE,
1624 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1625 ts.typeAndTimezone);
1626 }
1627 if (!(sb->s_flags & MS_RDONLY))
1628 udf_open_lvid(sb);
1629
1630 /* Assign the root inode */
1631 /* assign inodes by physical block number */
1632 /* perhaps it's not extensible enough, but for now ... */
1633 inode = udf_iget(sb, rootdir);
1634 if (!inode)
1635 {
1636 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1637 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1638 goto error_out;
1639 }
1640
1641 /* Allocate a dentry for the root inode */
1642 sb->s_root = d_alloc_root(inode);
1643 if (!sb->s_root)
1644 {
1645 printk("UDF-fs: Couldn't allocate root dentry\n");
1646 iput(inode);
1647 goto error_out;
1648 }
1649 sb->s_maxbytes = MAX_LFS_FILESIZE;
1650 return 0;
1651
1652error_out:
1653 if (UDF_SB_VAT(sb))
1654 iput(UDF_SB_VAT(sb));
1655 if (UDF_SB_NUMPARTS(sb))
1656 {
1657 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1658 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1659 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1660 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1661 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1662 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1663 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1664 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1665 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1666 {
1667 for (i=0; i<4; i++)
1668 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1669 }
1670 }
1671#ifdef CONFIG_UDF_NLS
1672 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1673 unload_nls(UDF_SB(sb)->s_nls_map);
1674#endif
1675 if (!(sb->s_flags & MS_RDONLY))
1676 udf_close_lvid(sb);
1677 udf_release_data(UDF_SB_LVIDBH(sb));
1678 UDF_SB_FREE(sb);
1679 kfree(sbi);
1680 sb->s_fs_info = NULL;
1681 return -EINVAL;
1682}
1683
1684void udf_error(struct super_block *sb, const char *function,
1685 const char *fmt, ...)
1686{
1687 va_list args;
1688
1689 if (!(sb->s_flags & MS_RDONLY))
1690 {
1691 /* mark sb error */
1692 sb->s_dirt = 1;
1693 }
1694 va_start(args, fmt);
1695 vsprintf(error_buf, fmt, args);
1696 va_end(args);
1697 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1698 sb->s_id, function, error_buf);
1699}
1700
1701void udf_warning(struct super_block *sb, const char *function,
1702 const char *fmt, ...)
1703{
1704 va_list args;
1705
1706 va_start (args, fmt);
1707 vsprintf(error_buf, fmt, args);
1708 va_end(args);
1709 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1710 sb->s_id, function, error_buf);
1711}
1712
1713/*
1714 * udf_put_super
1715 *
1716 * PURPOSE
1717 * Prepare for destruction of the superblock.
1718 *
1719 * DESCRIPTION
1720 * Called before the filesystem is unmounted.
1721 *
1722 * HISTORY
1723 * July 1, 1997 - Andrew E. Mileski
1724 * Written, tested, and released.
1725 */
1726static void
1727udf_put_super(struct super_block *sb)
1728{
1729 int i;
1730
1731 if (UDF_SB_VAT(sb))
1732 iput(UDF_SB_VAT(sb));
1733 if (UDF_SB_NUMPARTS(sb))
1734 {
1735 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1736 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1737 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1738 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1739 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1740 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1741 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1742 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1743 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1744 {
1745 for (i=0; i<4; i++)
1746 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1747 }
1748 }
1749#ifdef CONFIG_UDF_NLS
1750 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1751 unload_nls(UDF_SB(sb)->s_nls_map);
1752#endif
1753 if (!(sb->s_flags & MS_RDONLY))
1754 udf_close_lvid(sb);
1755 udf_release_data(UDF_SB_LVIDBH(sb));
1756 UDF_SB_FREE(sb);
1757 kfree(sb->s_fs_info);
1758 sb->s_fs_info = NULL;
1759}
1760
1761/*
1762 * udf_stat_fs
1763 *
1764 * PURPOSE
1765 * Return info about the filesystem.
1766 *
1767 * DESCRIPTION
1768 * Called by sys_statfs()
1769 *
1770 * HISTORY
1771 * July 1, 1997 - Andrew E. Mileski
1772 * Written, tested, and released.
1773 */
1774static int
1775udf_statfs(struct super_block *sb, struct kstatfs *buf)
1776{
1777 buf->f_type = UDF_SUPER_MAGIC;
1778 buf->f_bsize = sb->s_blocksize;
1779 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1780 buf->f_bfree = udf_count_free(sb);
1781 buf->f_bavail = buf->f_bfree;
1782 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1783 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1784 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1785 buf->f_ffree = buf->f_bfree;
1786 /* __kernel_fsid_t f_fsid */
1787 buf->f_namelen = UDF_NAME_LEN-2;
1788
1789 return 0;
1790}
1791
1792static unsigned char udf_bitmap_lookup[16] = {
1793 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1794};
1795
1796static unsigned int
1797udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1798{
1799 struct buffer_head *bh = NULL;
1800 unsigned int accum = 0;
1801 int index;
1802 int block = 0, newblock;
1803 kernel_lb_addr loc;
1804 uint32_t bytes;
1805 uint8_t value;
1806 uint8_t *ptr;
1807 uint16_t ident;
1808 struct spaceBitmapDesc *bm;
1809
1810 lock_kernel();
1811
1812 loc.logicalBlockNum = bitmap->s_extPosition;
1813 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1814 bh = udf_read_ptagged(sb, loc, 0, &ident);
1815
1816 if (!bh)
1817 {
1818 printk(KERN_ERR "udf: udf_count_free failed\n");
1819 goto out;
1820 }
1821 else if (ident != TAG_IDENT_SBD)
1822 {
1823 udf_release_data(bh);
1824 printk(KERN_ERR "udf: udf_count_free failed\n");
1825 goto out;
1826 }
1827
1828 bm = (struct spaceBitmapDesc *)bh->b_data;
1829 bytes = le32_to_cpu(bm->numOfBytes);
1830 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1831 ptr = (uint8_t *)bh->b_data;
1832
1833 while ( bytes > 0 )
1834 {
1835 while ((bytes > 0) && (index < sb->s_blocksize))
1836 {
1837 value = ptr[index];
1838 accum += udf_bitmap_lookup[ value & 0x0f ];
1839 accum += udf_bitmap_lookup[ value >> 4 ];
1840 index++;
1841 bytes--;
1842 }
1843 if ( bytes )
1844 {
1845 udf_release_data(bh);
1846 newblock = udf_get_lb_pblock(sb, loc, ++block);
1847 bh = udf_tread(sb, newblock);
1848 if (!bh)
1849 {
1850 udf_debug("read failed\n");
1851 goto out;
1852 }
1853 index = 0;
1854 ptr = (uint8_t *)bh->b_data;
1855 }
1856 }
1857 udf_release_data(bh);
1858
1859out:
1860 unlock_kernel();
1861
1862 return accum;
1863}
1864
1865static unsigned int
1866udf_count_free_table(struct super_block *sb, struct inode * table)
1867{
1868 unsigned int accum = 0;
1869 uint32_t extoffset, elen;
1870 kernel_lb_addr bloc, eloc;
1871 int8_t etype;
1872 struct buffer_head *bh = NULL;
1873
1874 lock_kernel();
1875
1876 bloc = UDF_I_LOCATION(table);
1877 extoffset = sizeof(struct unallocSpaceEntry);
1878
1879 while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1880 {
1881 accum += (elen >> table->i_sb->s_blocksize_bits);
1882 }
1883 udf_release_data(bh);
1884
1885 unlock_kernel();
1886
1887 return accum;
1888}
1889
1890static unsigned int
1891udf_count_free(struct super_block *sb)
1892{
1893 unsigned int accum = 0;
1894
1895 if (UDF_SB_LVIDBH(sb))
1896 {
1897 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1898 {
1899 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1900
1901 if (accum == 0xFFFFFFFF)
1902 accum = 0;
1903 }
1904 }
1905
1906 if (accum)
1907 return accum;
1908
1909 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1910 {
1911 accum += udf_count_free_bitmap(sb,
1912 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1913 }
1914 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1915 {
1916 accum += udf_count_free_bitmap(sb,
1917 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1918 }
1919 if (accum)
1920 return accum;
1921
1922 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1923 {
1924 accum += udf_count_free_table(sb,
1925 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1926 }
1927 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1928 {
1929 accum += udf_count_free_table(sb,
1930 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1931 }
1932
1933 return accum;
1934}
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