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udf: check if udf_load_logicalvol failed
[linux-2.6/mini2440.git] / fs / udf / super.c
blob913ece8eec61819562048f43717c9c2faa7f0a09
1 /*
2 * super.c
3 *
4 * PURPOSE
5 * Super block routines for the OSTA-UDF(tm) filesystem.
6 *
7 * DESCRIPTION
8 * OSTA-UDF(tm) = Optical Storage Technology Association
9 * Universal Disk Format.
10 *
11 * This code is based on version 2.00 of the UDF specification,
12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13 * http://www.osta.org/
14 * http://www.ecma.ch/
15 * http://www.iso.org/
16 *
17 * COPYRIGHT
18 * This file is distributed under the terms of the GNU General Public
19 * License (GPL). Copies of the GPL can be obtained from:
20 * ftp://prep.ai.mit.edu/pub/gnu/GPL
21 * Each contributing author retains all rights to their own work.
22 *
23 * (C) 1998 Dave Boynton
24 * (C) 1998-2004 Ben Fennema
25 * (C) 2000 Stelias Computing Inc
26 *
27 * HISTORY
28 *
29 * 09/24/98 dgb changed to allow compiling outside of kernel, and
30 * added some debugging.
31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
32 * 10/16/98 attempting some multi-session support
33 * 10/17/98 added freespace count for "df"
34 * 11/11/98 gr added novrs option
35 * 11/26/98 dgb added fileset,anchor mount options
36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
41 #include "udfdecl.h"
42
43 #include <linux/blkdev.h>
44 #include <linux/slab.h>
45 #include <linux/kernel.h>
46 #include <linux/module.h>
47 #include <linux/parser.h>
48 #include <linux/stat.h>
49 #include <linux/cdrom.h>
50 #include <linux/nls.h>
51 #include <linux/smp_lock.h>
52 #include <linux/buffer_head.h>
53 #include <linux/vfs.h>
54 #include <linux/vmalloc.h>
55 #include <linux/errno.h>
56 #include <asm/byteorder.h>
57
58 #include <linux/udf_fs.h>
59 #include "udf_sb.h"
60 #include "udf_i.h"
61
62 #include <linux/init.h>
63 #include <asm/uaccess.h>
64
65 #define VDS_POS_PRIMARY_VOL_DESC 0
66 #define VDS_POS_UNALLOC_SPACE_DESC 1
67 #define VDS_POS_LOGICAL_VOL_DESC 2
68 #define VDS_POS_PARTITION_DESC 3
69 #define VDS_POS_IMP_USE_VOL_DESC 4
70 #define VDS_POS_VOL_DESC_PTR 5
71 #define VDS_POS_TERMINATING_DESC 6
72 #define VDS_POS_LENGTH 7
73
74 static char error_buf[1024];
75
76 /* These are the "meat" - everything else is stuffing */
77 static int udf_fill_super(struct super_block *, void *, int);
78 static void udf_put_super(struct super_block *);
79 static void udf_write_super(struct super_block *);
80 static int udf_remount_fs(struct super_block *, int *, char *);
81 static int udf_check_valid(struct super_block *, int, int);
82 static int udf_vrs(struct super_block *sb, int silent);
83 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
84 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
85 kernel_lb_addr *);
86 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
87 static void udf_find_anchor(struct super_block *);
88 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
89 kernel_lb_addr *);
90 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
92 kernel_lb_addr *);
93 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
94 static void udf_open_lvid(struct super_block *);
95 static void udf_close_lvid(struct super_block *);
96 static unsigned int udf_count_free(struct super_block *);
97 static int udf_statfs(struct dentry *, struct kstatfs *);
98
99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
100 {
101 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
102 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
103 __u32 offset = number_of_partitions * 2 * sizeof(uint32_t)/sizeof(uint8_t);
104 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
105 }
106
107 /* UDF filesystem type */
108 static int udf_get_sb(struct file_system_type *fs_type,
109 int flags, const char *dev_name, void *data,
110 struct vfsmount *mnt)
111 {
112 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
113 }
114
115 static struct file_system_type udf_fstype = {
116 .owner = THIS_MODULE,
117 .name = "udf",
118 .get_sb = udf_get_sb,
119 .kill_sb = kill_block_super,
120 .fs_flags = FS_REQUIRES_DEV,
121 };
122
123 static struct kmem_cache *udf_inode_cachep;
124
125 static struct inode *udf_alloc_inode(struct super_block *sb)
126 {
127 struct udf_inode_info *ei;
128 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
129 if (!ei)
130 return NULL;
131
132 ei->i_unique = 0;
133 ei->i_lenExtents = 0;
134 ei->i_next_alloc_block = 0;
135 ei->i_next_alloc_goal = 0;
136 ei->i_strat4096 = 0;
137
138 return &ei->vfs_inode;
139 }
140
141 static void udf_destroy_inode(struct inode *inode)
142 {
143 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
144 }
145
146 static void init_once(struct kmem_cache *cachep, void *foo)
147 {
148 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
149
150 ei->i_ext.i_data = NULL;
151 inode_init_once(&ei->vfs_inode);
152 }
153
154 static int init_inodecache(void)
155 {
156 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
157 sizeof(struct udf_inode_info),
158 0, (SLAB_RECLAIM_ACCOUNT |
159 SLAB_MEM_SPREAD),
160 init_once);
161 if (!udf_inode_cachep)
162 return -ENOMEM;
163 return 0;
164 }
165
166 static void destroy_inodecache(void)
167 {
168 kmem_cache_destroy(udf_inode_cachep);
169 }
170
171 /* Superblock operations */
172 static const struct super_operations udf_sb_ops = {
173 .alloc_inode = udf_alloc_inode,
174 .destroy_inode = udf_destroy_inode,
175 .write_inode = udf_write_inode,
176 .delete_inode = udf_delete_inode,
177 .clear_inode = udf_clear_inode,
178 .put_super = udf_put_super,
179 .write_super = udf_write_super,
180 .statfs = udf_statfs,
181 .remount_fs = udf_remount_fs,
182 };
183
184 struct udf_options {
185 unsigned char novrs;
186 unsigned int blocksize;
187 unsigned int session;
188 unsigned int lastblock;
189 unsigned int anchor;
190 unsigned int volume;
191 unsigned short partition;
192 unsigned int fileset;
193 unsigned int rootdir;
194 unsigned int flags;
195 mode_t umask;
196 gid_t gid;
197 uid_t uid;
198 struct nls_table *nls_map;
199 };
200
201 static int __init init_udf_fs(void)
202 {
203 int err;
204
205 err = init_inodecache();
206 if (err)
207 goto out1;
208 err = register_filesystem(&udf_fstype);
209 if (err)
210 goto out;
211
212 return 0;
213
214 out:
215 destroy_inodecache();
216
217 out1:
218 return err;
219 }
220
221 static void __exit exit_udf_fs(void)
222 {
223 unregister_filesystem(&udf_fstype);
224 destroy_inodecache();
225 }
226
227 module_init(init_udf_fs)
228 module_exit(exit_udf_fs)
229
230 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
231 {
232 struct udf_sb_info *sbi = UDF_SB(sb);
233
234 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
235 GFP_KERNEL);
236 if (!sbi->s_partmaps) {
237 udf_error(sb, __FUNCTION__,
238 "Unable to allocate space for %d partition maps",
239 count);
240 sbi->s_partitions = 0;
241 return -ENOMEM;
242 }
243
244 sbi->s_partitions = count;
245 return 0;
246 }
247
248 /*
249 * udf_parse_options
250 *
251 * PURPOSE
252 * Parse mount options.
253 *
254 * DESCRIPTION
255 * The following mount options are supported:
256 *
257 * gid= Set the default group.
258 * umask= Set the default umask.
259 * uid= Set the default user.
260 * bs= Set the block size.
261 * unhide Show otherwise hidden files.
262 * undelete Show deleted files in lists.
263 * adinicb Embed data in the inode (default)
264 * noadinicb Don't embed data in the inode
265 * shortad Use short ad's
266 * longad Use long ad's (default)
267 * nostrict Unset strict conformance
268 * iocharset= Set the NLS character set
269 *
270 * The remaining are for debugging and disaster recovery:
271 *
272 * novrs Skip volume sequence recognition
273 *
274 * The following expect a offset from 0.
275 *
276 * session= Set the CDROM session (default= last session)
277 * anchor= Override standard anchor location. (default= 256)
278 * volume= Override the VolumeDesc location. (unused)
279 * partition= Override the PartitionDesc location. (unused)
280 * lastblock= Set the last block of the filesystem/
281 *
282 * The following expect a offset from the partition root.
283 *
284 * fileset= Override the fileset block location. (unused)
285 * rootdir= Override the root directory location. (unused)
286 * WARNING: overriding the rootdir to a non-directory may
287 * yield highly unpredictable results.
288 *
289 * PRE-CONDITIONS
290 * options Pointer to mount options string.
291 * uopts Pointer to mount options variable.
292 *
293 * POST-CONDITIONS
294 * <return> 1 Mount options parsed okay.
295 * <return> 0 Error parsing mount options.
296 *
297 * HISTORY
298 * July 1, 1997 - Andrew E. Mileski
299 * Written, tested, and released.
300 */
301
302 enum {
303 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
304 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
305 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
306 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
307 Opt_rootdir, Opt_utf8, Opt_iocharset,
308 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
309 };
310
311 static match_table_t tokens = {
312 {Opt_novrs, "novrs"},
313 {Opt_nostrict, "nostrict"},
314 {Opt_bs, "bs=%u"},
315 {Opt_unhide, "unhide"},
316 {Opt_undelete, "undelete"},
317 {Opt_noadinicb, "noadinicb"},
318 {Opt_adinicb, "adinicb"},
319 {Opt_shortad, "shortad"},
320 {Opt_longad, "longad"},
321 {Opt_uforget, "uid=forget"},
322 {Opt_uignore, "uid=ignore"},
323 {Opt_gforget, "gid=forget"},
324 {Opt_gignore, "gid=ignore"},
325 {Opt_gid, "gid=%u"},
326 {Opt_uid, "uid=%u"},
327 {Opt_umask, "umask=%o"},
328 {Opt_session, "session=%u"},
329 {Opt_lastblock, "lastblock=%u"},
330 {Opt_anchor, "anchor=%u"},
331 {Opt_volume, "volume=%u"},
332 {Opt_partition, "partition=%u"},
333 {Opt_fileset, "fileset=%u"},
334 {Opt_rootdir, "rootdir=%u"},
335 {Opt_utf8, "utf8"},
336 {Opt_iocharset, "iocharset=%s"},
337 {Opt_err, NULL}
338 };
339
340 static int udf_parse_options(char *options, struct udf_options *uopt)
341 {
342 char *p;
343 int option;
344
345 uopt->novrs = 0;
346 uopt->blocksize = 2048;
347 uopt->partition = 0xFFFF;
348 uopt->session = 0xFFFFFFFF;
349 uopt->lastblock = 0;
350 uopt->anchor = 0;
351 uopt->volume = 0xFFFFFFFF;
352 uopt->rootdir = 0xFFFFFFFF;
353 uopt->fileset = 0xFFFFFFFF;
354 uopt->nls_map = NULL;
355
356 if (!options)
357 return 1;
358
359 while ((p = strsep(&options, ",")) != NULL) {
360 substring_t args[MAX_OPT_ARGS];
361 int token;
362 if (!*p)
363 continue;
364
365 token = match_token(p, tokens, args);
366 switch (token) {
367 case Opt_novrs:
368 uopt->novrs = 1;
369 case Opt_bs:
370 if (match_int(&args[0], &option))
371 return 0;
372 uopt->blocksize = option;
373 break;
374 case Opt_unhide:
375 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
376 break;
377 case Opt_undelete:
378 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
379 break;
380 case Opt_noadinicb:
381 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
382 break;
383 case Opt_adinicb:
384 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
385 break;
386 case Opt_shortad:
387 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
388 break;
389 case Opt_longad:
390 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
391 break;
392 case Opt_gid:
393 if (match_int(args, &option))
394 return 0;
395 uopt->gid = option;
396 uopt->flags |= (1 << UDF_FLAG_GID_SET);
397 break;
398 case Opt_uid:
399 if (match_int(args, &option))
400 return 0;
401 uopt->uid = option;
402 uopt->flags |= (1 << UDF_FLAG_UID_SET);
403 break;
404 case Opt_umask:
405 if (match_octal(args, &option))
406 return 0;
407 uopt->umask = option;
408 break;
409 case Opt_nostrict:
410 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
411 break;
412 case Opt_session:
413 if (match_int(args, &option))
414 return 0;
415 uopt->session = option;
416 break;
417 case Opt_lastblock:
418 if (match_int(args, &option))
419 return 0;
420 uopt->lastblock = option;
421 break;
422 case Opt_anchor:
423 if (match_int(args, &option))
424 return 0;
425 uopt->anchor = option;
426 break;
427 case Opt_volume:
428 if (match_int(args, &option))
429 return 0;
430 uopt->volume = option;
431 break;
432 case Opt_partition:
433 if (match_int(args, &option))
434 return 0;
435 uopt->partition = option;
436 break;
437 case Opt_fileset:
438 if (match_int(args, &option))
439 return 0;
440 uopt->fileset = option;
441 break;
442 case Opt_rootdir:
443 if (match_int(args, &option))
444 return 0;
445 uopt->rootdir = option;
446 break;
447 case Opt_utf8:
448 uopt->flags |= (1 << UDF_FLAG_UTF8);
449 break;
450 #ifdef CONFIG_UDF_NLS
451 case Opt_iocharset:
452 uopt->nls_map = load_nls(args[0].from);
453 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
454 break;
455 #endif
456 case Opt_uignore:
457 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
458 break;
459 case Opt_uforget:
460 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
461 break;
462 case Opt_gignore:
463 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
464 break;
465 case Opt_gforget:
466 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
467 break;
468 default:
469 printk(KERN_ERR "udf: bad mount option \"%s\" "
470 "or missing value\n", p);
471 return 0;
472 }
473 }
474 return 1;
475 }
476
477 void udf_write_super(struct super_block *sb)
478 {
479 lock_kernel();
480
481 if (!(sb->s_flags & MS_RDONLY))
482 udf_open_lvid(sb);
483 sb->s_dirt = 0;
484
485 unlock_kernel();
486 }
487
488 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
489 {
490 struct udf_options uopt;
491 struct udf_sb_info *sbi = UDF_SB(sb);
492
493 uopt.flags = sbi->s_flags;
494 uopt.uid = sbi->s_uid;
495 uopt.gid = sbi->s_gid;
496 uopt.umask = sbi->s_umask;
497
498 if (!udf_parse_options(options, &uopt))
499 return -EINVAL;
500
501 sbi->s_flags = uopt.flags;
502 sbi->s_uid = uopt.uid;
503 sbi->s_gid = uopt.gid;
504 sbi->s_umask = uopt.umask;
505
506 if (sbi->s_lvid_bh) {
507 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
508 if (write_rev > UDF_MAX_WRITE_VERSION)
509 *flags |= MS_RDONLY;
510 }
511
512 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
513 return 0;
514 if (*flags & MS_RDONLY)
515 udf_close_lvid(sb);
516 else
517 udf_open_lvid(sb);
518
519 return 0;
520 }
521
522 /*
523 * udf_set_blocksize
524 *
525 * PURPOSE
526 * Set the block size to be used in all transfers.
527 *
528 * DESCRIPTION
529 * To allow room for a DMA transfer, it is best to guess big when unsure.
530 * This routine picks 2048 bytes as the blocksize when guessing. This
531 * should be adequate until devices with larger block sizes become common.
532 *
533 * Note that the Linux kernel can currently only deal with blocksizes of
534 * 512, 1024, 2048, 4096, and 8192 bytes.
535 *
536 * PRE-CONDITIONS
537 * sb Pointer to _locked_ superblock.
538 *
539 * POST-CONDITIONS
540 * sb->s_blocksize Blocksize.
541 * sb->s_blocksize_bits log2 of blocksize.
542 * <return> 0 Blocksize is valid.
543 * <return> 1 Blocksize is invalid.
544 *
545 * HISTORY
546 * July 1, 1997 - Andrew E. Mileski
547 * Written, tested, and released.
548 */
549 static int udf_set_blocksize(struct super_block *sb, int bsize)
550 {
551 if (!sb_min_blocksize(sb, bsize)) {
552 udf_debug("Bad block size (%d)\n", bsize);
553 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
554 return 0;
555 }
556
557 return sb->s_blocksize;
558 }
559
560 static int udf_vrs(struct super_block *sb, int silent)
561 {
562 struct volStructDesc *vsd = NULL;
563 int sector = 32768;
564 int sectorsize;
565 struct buffer_head *bh = NULL;
566 int iso9660 = 0;
567 int nsr02 = 0;
568 int nsr03 = 0;
569 struct udf_sb_info *sbi;
570
571 /* Block size must be a multiple of 512 */
572 if (sb->s_blocksize & 511)
573 return 0;
574 sbi = UDF_SB(sb);
575
576 if (sb->s_blocksize < sizeof(struct volStructDesc))
577 sectorsize = sizeof(struct volStructDesc);
578 else
579 sectorsize = sb->s_blocksize;
580
581 sector += (sbi->s_session << sb->s_blocksize_bits);
582
583 udf_debug("Starting at sector %u (%ld byte sectors)\n",
584 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
585 /* Process the sequence (if applicable) */
586 for (; !nsr02 && !nsr03; sector += sectorsize) {
587 /* Read a block */
588 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
589 if (!bh)
590 break;
591
592 /* Look for ISO descriptors */
593 vsd = (struct volStructDesc *)(bh->b_data +
594 (sector & (sb->s_blocksize - 1)));
595
596 if (vsd->stdIdent[0] == 0) {
597 brelse(bh);
598 break;
599 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
600 VSD_STD_ID_LEN)) {
601 iso9660 = sector;
602 switch (vsd->structType) {
603 case 0:
604 udf_debug("ISO9660 Boot Record found\n");
605 break;
606 case 1:
607 udf_debug("ISO9660 Primary Volume Descriptor "
608 "found\n");
609 break;
610 case 2:
611 udf_debug("ISO9660 Supplementary Volume "
612 "Descriptor found\n");
613 break;
614 case 3:
615 udf_debug("ISO9660 Volume Partition Descriptor "
616 "found\n");
617 break;
618 case 255:
619 udf_debug("ISO9660 Volume Descriptor Set "
620 "Terminator found\n");
621 break;
622 default:
623 udf_debug("ISO9660 VRS (%u) found\n",
624 vsd->structType);
625 break;
626 }
627 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
628 VSD_STD_ID_LEN))
629 ; /* nothing */
630 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
631 VSD_STD_ID_LEN)) {
632 brelse(bh);
633 break;
634 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
635 VSD_STD_ID_LEN))
636 nsr02 = sector;
637 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
638 VSD_STD_ID_LEN))
639 nsr03 = sector;
640 brelse(bh);
641 }
642
643 if (nsr03)
644 return nsr03;
645 else if (nsr02)
646 return nsr02;
647 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
648 return -1;
649 else
650 return 0;
651 }
652
653 /*
654 * udf_find_anchor
655 *
656 * PURPOSE
657 * Find an anchor volume descriptor.
658 *
659 * PRE-CONDITIONS
660 * sb Pointer to _locked_ superblock.
661 * lastblock Last block on media.
662 *
663 * POST-CONDITIONS
664 * <return> 1 if not found, 0 if ok
665 *
666 * HISTORY
667 * July 1, 1997 - Andrew E. Mileski
668 * Written, tested, and released.
669 */
670 static void udf_find_anchor(struct super_block *sb)
671 {
672 int lastblock;
673 struct buffer_head *bh = NULL;
674 uint16_t ident;
675 uint32_t location;
676 int i;
677 struct udf_sb_info *sbi;
678
679 sbi = UDF_SB(sb);
680 lastblock = sbi->s_last_block;
681
682 if (lastblock) {
683 int varlastblock = udf_variable_to_fixed(lastblock);
684 int last[] = { lastblock, lastblock - 2,
685 lastblock - 150, lastblock - 152,
686 varlastblock, varlastblock - 2,
687 varlastblock - 150, varlastblock - 152 };
688
689 lastblock = 0;
690
691 /* Search for an anchor volume descriptor pointer */
692
693 /* according to spec, anchor is in either:
694 * block 256
695 * lastblock-256
696 * lastblock
697 * however, if the disc isn't closed, it could be 512 */
698
699 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
700 ident = location = 0;
701 if (last[i] >= 0) {
702 bh = sb_bread(sb, last[i]);
703 if (bh) {
704 tag *t = (tag *)bh->b_data;
705 ident = le16_to_cpu(t->tagIdent);
706 location = le32_to_cpu(t->tagLocation);
707 brelse(bh);
708 }
709 }
710
711 if (ident == TAG_IDENT_AVDP) {
712 if (location == last[i] - sbi->s_session) {
713 lastblock = last[i] - sbi->s_session;
714 sbi->s_anchor[0] = lastblock;
715 sbi->s_anchor[1] = lastblock - 256;
716 } else if (location == udf_variable_to_fixed(last[i]) - sbi->s_session) {
717 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
718 lastblock = udf_variable_to_fixed(last[i]) - sbi->s_session;
719 sbi->s_anchor[0] = lastblock;
720 sbi->s_anchor[1] = lastblock - 256 - sbi->s_session;
721 } else {
722 udf_debug("Anchor found at block %d, location mismatch %d.\n",
723 last[i], location);
724 }
725 } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
726 lastblock = last[i];
727 sbi->s_anchor[3] = 512;
728 } else {
729 ident = location = 0;
730 if (last[i] >= 256) {
731 bh = sb_bread(sb, last[i] - 256);
732 if (bh) {
733 tag *t = (tag *)bh->b_data;
734 ident = le16_to_cpu(t->tagIdent);
735 location = le32_to_cpu(t->tagLocation);
736 brelse(bh);
737 }
738 }
739
740 if (ident == TAG_IDENT_AVDP &&
741 location == last[i] - 256 - sbi->s_session) {
742 lastblock = last[i];
743 sbi->s_anchor[1] = last[i] - 256;
744 } else {
745 ident = location = 0;
746 if (last[i] >= 312 + sbi->s_session) {
747 bh = sb_bread(sb, last[i] - 312 - sbi->s_session);
748 if (bh) {
749 tag *t = (tag *)bh->b_data;
750 ident = le16_to_cpu(t->tagIdent);
751 location = le32_to_cpu(t->tagLocation);
752 brelse(bh);
753 }
754 }
755
756 if (ident == TAG_IDENT_AVDP &&
757 location == udf_variable_to_fixed(last[i]) - 256) {
758 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
759 lastblock = udf_variable_to_fixed(last[i]);
760 sbi->s_anchor[1] = lastblock - 256;
761 }
762 }
763 }
764 }
765 }
766
767 if (!lastblock) {
768 /* We haven't found the lastblock. check 312 */
769 bh = sb_bread(sb, 312 + sbi->s_session);
770 if (bh) {
771 tag *t = (tag *)bh->b_data;
772 ident = le16_to_cpu(t->tagIdent);
773 location = le32_to_cpu(t->tagLocation);
774 brelse(bh);
775
776 if (ident == TAG_IDENT_AVDP && location == 256)
777 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
778 }
779 }
780
781 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
782 if (sbi->s_anchor[i]) {
783 bh = udf_read_tagged(sb, sbi->s_anchor[i],
784 sbi->s_anchor[i], &ident);
785 if (!bh)
786 sbi->s_anchor[i] = 0;
787 else {
788 brelse(bh);
789 if ((ident != TAG_IDENT_AVDP) &&
790 (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
791 sbi->s_anchor[i] = 0;
792 }
793 }
794 }
795
796 sbi->s_last_block = lastblock;
797 }
798
799 static int udf_find_fileset(struct super_block *sb,
800 kernel_lb_addr *fileset,
801 kernel_lb_addr *root)
802 {
803 struct buffer_head *bh = NULL;
804 long lastblock;
805 uint16_t ident;
806 struct udf_sb_info *sbi;
807
808 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
809 fileset->partitionReferenceNum != 0xFFFF) {
810 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
811
812 if (!bh) {
813 return 1;
814 } else if (ident != TAG_IDENT_FSD) {
815 brelse(bh);
816 return 1;
817 }
818
819 }
820
821 sbi = UDF_SB(sb);
822 if (!bh) {
823 /* Search backwards through the partitions */
824 kernel_lb_addr newfileset;
825
826 /* --> cvg: FIXME - is it reasonable? */
827 return 1;
828
829 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
830 (newfileset.partitionReferenceNum != 0xFFFF &&
831 fileset->logicalBlockNum == 0xFFFFFFFF &&
832 fileset->partitionReferenceNum == 0xFFFF);
833 newfileset.partitionReferenceNum--) {
834 lastblock = sbi->s_partmaps
835 [newfileset.partitionReferenceNum]
836 .s_partition_len;
837 newfileset.logicalBlockNum = 0;
838
839 do {
840 bh = udf_read_ptagged(sb, newfileset, 0,
841 &ident);
842 if (!bh) {
843 newfileset.logicalBlockNum++;
844 continue;
845 }
846
847 switch (ident) {
848 case TAG_IDENT_SBD:
849 {
850 struct spaceBitmapDesc *sp;
851 sp = (struct spaceBitmapDesc *)bh->b_data;
852 newfileset.logicalBlockNum += 1 +
853 ((le32_to_cpu(sp->numOfBytes) +
854 sizeof(struct spaceBitmapDesc) - 1)
855 >> sb->s_blocksize_bits);
856 brelse(bh);
857 break;
858 }
859 case TAG_IDENT_FSD:
860 *fileset = newfileset;
861 break;
862 default:
863 newfileset.logicalBlockNum++;
864 brelse(bh);
865 bh = NULL;
866 break;
867 }
868 } while (newfileset.logicalBlockNum < lastblock &&
869 fileset->logicalBlockNum == 0xFFFFFFFF &&
870 fileset->partitionReferenceNum == 0xFFFF);
871 }
872 }
873
874 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
875 fileset->partitionReferenceNum != 0xFFFF) && bh) {
876 udf_debug("Fileset at block=%d, partition=%d\n",
877 fileset->logicalBlockNum,
878 fileset->partitionReferenceNum);
879
880 sbi->s_partition = fileset->partitionReferenceNum;
881 udf_load_fileset(sb, bh, root);
882 brelse(bh);
883 return 0;
884 }
885 return 1;
886 }
887
888 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
889 {
890 struct primaryVolDesc *pvoldesc;
891 time_t recording;
892 long recording_usec;
893 struct ustr instr;
894 struct ustr outstr;
895
896 pvoldesc = (struct primaryVolDesc *)bh->b_data;
897
898 if (udf_stamp_to_time(&recording, &recording_usec,
899 lets_to_cpu(pvoldesc->recordingDateAndTime))) {
900 kernel_timestamp ts;
901 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
902 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
903 " %02u:%02u (%x)\n",
904 recording, recording_usec,
905 ts.year, ts.month, ts.day, ts.hour,
906 ts.minute, ts.typeAndTimezone);
907 UDF_SB(sb)->s_record_time.tv_sec = recording;
908 UDF_SB(sb)->s_record_time.tv_nsec = recording_usec * 1000;
909 }
910
911 if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
912 if (udf_CS0toUTF8(&outstr, &instr)) {
913 strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
914 outstr.u_len > 31 ? 31 : outstr.u_len);
915 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
916 }
917 }
918
919 if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
920 if (udf_CS0toUTF8(&outstr, &instr))
921 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
922 }
923 }
924
925 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
926 kernel_lb_addr *root)
927 {
928 struct fileSetDesc *fset;
929
930 fset = (struct fileSetDesc *)bh->b_data;
931
932 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
933
934 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
935
936 udf_debug("Rootdir at block=%d, partition=%d\n",
937 root->logicalBlockNum, root->partitionReferenceNum);
938 }
939
940 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
941 {
942 struct partitionDesc *p;
943 int i;
944 struct udf_part_map *map;
945 struct udf_sb_info *sbi;
946
947 p = (struct partitionDesc *)bh->b_data;
948 sbi = UDF_SB(sb);
949
950 for (i = 0; i < sbi->s_partitions; i++) {
951 map = &sbi->s_partmaps[i];
952 udf_debug("Searching map: (%d == %d)\n",
953 map->s_partition_num, le16_to_cpu(p->partitionNumber));
954 if (map->s_partition_num == le16_to_cpu(p->partitionNumber)) {
955 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
956 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
957 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
958 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
959 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
960 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
961 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
962 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
963 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
964 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
965
966 if (!strcmp(p->partitionContents.ident,
967 PD_PARTITION_CONTENTS_NSR02) ||
968 !strcmp(p->partitionContents.ident,
969 PD_PARTITION_CONTENTS_NSR03)) {
970 struct partitionHeaderDesc *phd;
971
972 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
973 if (phd->unallocSpaceTable.extLength) {
974 kernel_lb_addr loc = {
975 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
976 .partitionReferenceNum = i,
977 };
978
979 map->s_uspace.s_table =
980 udf_iget(sb, loc);
981 if (!map->s_uspace.s_table) {
982 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
983 return 1;
984 }
985 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
986 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
987 i, map->s_uspace.s_table->i_ino);
988 }
989 if (phd->unallocSpaceBitmap.extLength) {
990 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
991 if (map->s_uspace.s_bitmap != NULL) {
992 map->s_uspace.s_bitmap->s_extLength =
993 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
994 map->s_uspace.s_bitmap->s_extPosition =
995 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
996 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
997 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
998 i, map->s_uspace.s_bitmap->s_extPosition);
999 }
1000 }
1001 if (phd->partitionIntegrityTable.extLength)
1002 udf_debug("partitionIntegrityTable (part %d)\n", i);
1003 if (phd->freedSpaceTable.extLength) {
1004 kernel_lb_addr loc = {
1005 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1006 .partitionReferenceNum = i,
1007 };
1008
1009 map->s_fspace.s_table =
1010 udf_iget(sb, loc);
1011 if (!map->s_fspace.s_table) {
1012 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1013 return 1;
1014 }
1015 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1016 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1017 i, map->s_fspace.s_table->i_ino);
1018 }
1019 if (phd->freedSpaceBitmap.extLength) {
1020 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
1021 if (map->s_fspace.s_bitmap != NULL) {
1022 map->s_fspace.s_bitmap->s_extLength =
1023 le32_to_cpu(phd->freedSpaceBitmap.extLength);
1024 map->s_fspace.s_bitmap->s_extPosition =
1025 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1026 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1027 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1028 i, map->s_fspace.s_bitmap->s_extPosition);
1029 }
1030 }
1031 }
1032 break;
1033 }
1034 }
1035 if (i == sbi->s_partitions) {
1036 udf_debug("Partition (%d) not found in partition map\n",
1037 le16_to_cpu(p->partitionNumber));
1038 } else {
1039 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1040 "block length %d\n",
1041 le16_to_cpu(p->partitionNumber), i,
1042 map->s_partition_type,
1043 map->s_partition_root,
1044 map->s_partition_len);
1045 }
1046 return 0;
1047 }
1048
1049 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1050 kernel_lb_addr *fileset)
1051 {
1052 struct logicalVolDesc *lvd;
1053 int i, j, offset;
1054 uint8_t type;
1055 struct udf_sb_info *sbi = UDF_SB(sb);
1056
1057 lvd = (struct logicalVolDesc *)bh->b_data;
1058
1059 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1060 if (i != 0)
1061 return i;
1062
1063 for (i = 0, offset = 0;
1064 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1065 i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
1066 struct udf_part_map *map = &sbi->s_partmaps[i];
1067 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1068 if (type == 1) {
1069 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1070 map->s_partition_type = UDF_TYPE1_MAP15;
1071 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1072 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1073 map->s_partition_func = NULL;
1074 } else if (type == 2) {
1075 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1076 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
1077 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
1078 map->s_partition_type = UDF_VIRTUAL_MAP15;
1079 map->s_partition_func = udf_get_pblock_virt15;
1080 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
1081 map->s_partition_type = UDF_VIRTUAL_MAP20;
1082 map->s_partition_func = udf_get_pblock_virt20;
1083 }
1084 } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1085 uint32_t loc;
1086 uint16_t ident;
1087 struct sparingTable *st;
1088 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1089
1090 map->s_partition_type = UDF_SPARABLE_MAP15;
1091 map->s_type_specific.s_sparing.s_packet_len = le16_to_cpu(spm->packetLength);
1092 for (j = 0; j < spm->numSparingTables; j++) {
1093 loc = le32_to_cpu(spm->locSparingTable[j]);
1094 map->s_type_specific.s_sparing.s_spar_map[j] =
1095 udf_read_tagged(sb, loc, loc, &ident);
1096 if (map->s_type_specific.s_sparing.s_spar_map[j] != NULL) {
1097 st = (struct sparingTable *)map->s_type_specific.s_sparing.s_spar_map[j]->b_data;
1098 if (ident != 0 ||
1099 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1100 brelse(map->s_type_specific.s_sparing.s_spar_map[j]);
1101 map->s_type_specific.s_sparing.s_spar_map[j] = NULL;
1102 }
1103 }
1104 }
1105 map->s_partition_func = udf_get_pblock_spar15;
1106 } else {
1107 udf_debug("Unknown ident: %s\n",
1108 upm2->partIdent.ident);
1109 continue;
1110 }
1111 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1112 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1113 }
1114 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1115 i, map->s_partition_num, type,
1116 map->s_volumeseqnum);
1117 }
1118
1119 if (fileset) {
1120 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1121
1122 *fileset = lelb_to_cpu(la->extLocation);
1123 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1124 "partition=%d\n", fileset->logicalBlockNum,
1125 fileset->partitionReferenceNum);
1126 }
1127 if (lvd->integritySeqExt.extLength)
1128 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1129
1130 return 0;
1131 }
1132
1133 /*
1134 * udf_load_logicalvolint
1135 *
1136 */
1137 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1138 {
1139 struct buffer_head *bh = NULL;
1140 uint16_t ident;
1141 struct udf_sb_info *sbi = UDF_SB(sb);
1142 struct logicalVolIntegrityDesc *lvid;
1143
1144 while (loc.extLength > 0 &&
1145 (bh = udf_read_tagged(sb, loc.extLocation,
1146 loc.extLocation, &ident)) &&
1147 ident == TAG_IDENT_LVID) {
1148 sbi->s_lvid_bh = bh;
1149 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1150
1151 if (lvid->nextIntegrityExt.extLength)
1152 udf_load_logicalvolint(sb,
1153 leea_to_cpu(lvid->nextIntegrityExt));
1154
1155 if (sbi->s_lvid_bh != bh)
1156 brelse(bh);
1157 loc.extLength -= sb->s_blocksize;
1158 loc.extLocation++;
1159 }
1160 if (sbi->s_lvid_bh != bh)
1161 brelse(bh);
1162 }
1163
1164 /*
1165 * udf_process_sequence
1166 *
1167 * PURPOSE
1168 * Process a main/reserve volume descriptor sequence.
1169 *
1170 * PRE-CONDITIONS
1171 * sb Pointer to _locked_ superblock.
1172 * block First block of first extent of the sequence.
1173 * lastblock Lastblock of first extent of the sequence.
1174 *
1175 * HISTORY
1176 * July 1, 1997 - Andrew E. Mileski
1177 * Written, tested, and released.
1178 */
1179 static int udf_process_sequence(struct super_block *sb, long block,
1180 long lastblock, kernel_lb_addr *fileset)
1181 {
1182 struct buffer_head *bh = NULL;
1183 struct udf_vds_record vds[VDS_POS_LENGTH];
1184 struct generic_desc *gd;
1185 struct volDescPtr *vdp;
1186 int done = 0;
1187 int i, j;
1188 uint32_t vdsn;
1189 uint16_t ident;
1190 long next_s = 0, next_e = 0;
1191
1192 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1193
1194 /* Read the main descriptor sequence */
1195 for (; (!done && block <= lastblock); block++) {
1196
1197 bh = udf_read_tagged(sb, block, block, &ident);
1198 if (!bh)
1199 break;
1200
1201 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1202 gd = (struct generic_desc *)bh->b_data;
1203 vdsn = le32_to_cpu(gd->volDescSeqNum);
1204 switch (ident) {
1205 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1206 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1207 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1208 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1209 }
1210 break;
1211 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1212 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1213 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1214 vds[VDS_POS_VOL_DESC_PTR].block = block;
1215
1216 vdp = (struct volDescPtr *)bh->b_data;
1217 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1218 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1219 next_e = next_e >> sb->s_blocksize_bits;
1220 next_e += next_s;
1221 }
1222 break;
1223 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1224 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1225 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1226 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1227 }
1228 break;
1229 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1230 if (!vds[VDS_POS_PARTITION_DESC].block)
1231 vds[VDS_POS_PARTITION_DESC].block = block;
1232 break;
1233 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1234 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1235 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1236 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1237 }
1238 break;
1239 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1240 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1241 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1242 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1243 }
1244 break;
1245 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1246 vds[VDS_POS_TERMINATING_DESC].block = block;
1247 if (next_e) {
1248 block = next_s;
1249 lastblock = next_e;
1250 next_s = next_e = 0;
1251 } else {
1252 done = 1;
1253 }
1254 break;
1255 }
1256 brelse(bh);
1257 }
1258 for (i = 0; i < VDS_POS_LENGTH; i++) {
1259 if (vds[i].block) {
1260 bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1261 &ident);
1262
1263 if (i == VDS_POS_PRIMARY_VOL_DESC) {
1264 udf_load_pvoldesc(sb, bh);
1265 } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1266 if (udf_load_logicalvol(sb, bh, fileset)) {
1267 brelse(bh);
1268 return 1;
1269 }
1270 } else if (i == VDS_POS_PARTITION_DESC) {
1271 struct buffer_head *bh2 = NULL;
1272 if (udf_load_partdesc(sb, bh)) {
1273 brelse(bh);
1274 return 1;
1275 }
1276 for (j = vds[i].block + 1;
1277 j < vds[VDS_POS_TERMINATING_DESC].block;
1278 j++) {
1279 bh2 = udf_read_tagged(sb, j, j, &ident);
1280 gd = (struct generic_desc *)bh2->b_data;
1281 if (ident == TAG_IDENT_PD)
1282 if (udf_load_partdesc(sb,
1283 bh2)) {
1284 brelse(bh);
1285 brelse(bh2);
1286 return 1;
1287 }
1288 brelse(bh2);
1289 }
1290 }
1291 brelse(bh);
1292 }
1293 }
1294
1295 return 0;
1296 }
1297
1298 /*
1299 * udf_check_valid()
1300 */
1301 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1302 {
1303 long block;
1304
1305 if (novrs) {
1306 udf_debug("Validity check skipped because of novrs option\n");
1307 return 0;
1308 }
1309 /* Check that it is NSR02 compliant */
1310 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1311 else {
1312 block = udf_vrs(sb, silent);
1313 if (block == -1) {
1314 struct udf_sb_info *sbi = UDF_SB(sb);
1315 udf_debug("Failed to read byte 32768. Assuming open "
1316 "disc. Skipping validity check\n");
1317 if (!sbi->s_last_block)
1318 sbi->s_last_block = udf_get_last_block(sb);
1319 return 0;
1320 } else
1321 return !block;
1322 }
1323 }
1324
1325 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1326 {
1327 struct anchorVolDescPtr *anchor;
1328 uint16_t ident;
1329 struct buffer_head *bh;
1330 long main_s, main_e, reserve_s, reserve_e;
1331 int i, j;
1332 struct udf_sb_info *sbi;
1333
1334 if (!sb)
1335 return 1;
1336 sbi = UDF_SB(sb);
1337
1338 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1339 if (sbi->s_anchor[i] &&
1340 (bh = udf_read_tagged(sb, sbi->s_anchor[i],
1341 sbi->s_anchor[i], &ident))) {
1342 anchor = (struct anchorVolDescPtr *)bh->b_data;
1343
1344 /* Locate the main sequence */
1345 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1346 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1347 main_e = main_e >> sb->s_blocksize_bits;
1348 main_e += main_s;
1349
1350 /* Locate the reserve sequence */
1351 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1352 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1353 reserve_e = reserve_e >> sb->s_blocksize_bits;
1354 reserve_e += reserve_s;
1355
1356 brelse(bh);
1357
1358 /* Process the main & reserve sequences */
1359 /* responsible for finding the PartitionDesc(s) */
1360 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1361 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1362 break;
1363 }
1364 }
1365
1366 if (i == ARRAY_SIZE(sbi->s_anchor)) {
1367 udf_debug("No Anchor block found\n");
1368 return 1;
1369 } else
1370 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1371
1372 for (i = 0; i < sbi->s_partitions; i++) {
1373 kernel_lb_addr uninitialized_var(ino);
1374 struct udf_part_map *map = &sbi->s_partmaps[i];
1375 switch (map->s_partition_type) {
1376 case UDF_VIRTUAL_MAP15:
1377 case UDF_VIRTUAL_MAP20:
1378 if (!sbi->s_last_block) {
1379 sbi->s_last_block = udf_get_last_block(sb);
1380 udf_find_anchor(sb);
1381 }
1382
1383 if (!sbi->s_last_block) {
1384 udf_debug("Unable to determine Lastblock (For "
1385 "Virtual Partition)\n");
1386 return 1;
1387 }
1388
1389 for (j = 0; j < sbi->s_partitions; j++) {
1390 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1391 if (j != i &&
1392 map->s_volumeseqnum == map2->s_volumeseqnum &&
1393 map->s_partition_num == map2->s_partition_num) {
1394 ino.partitionReferenceNum = j;
1395 ino.logicalBlockNum = sbi->s_last_block - map2->s_partition_root;
1396 break;
1397 }
1398 }
1399
1400 if (j == sbi->s_partitions)
1401 return 1;
1402
1403 sbi->s_vat_inode = udf_iget(sb, ino);
1404 if (!sbi->s_vat_inode)
1405 return 1;
1406
1407 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1408 map->s_type_specific.s_virtual.s_start_offset =
1409 udf_ext0_offset(sbi->s_vat_inode);
1410 map->s_type_specific.s_virtual.s_num_entries =
1411 (sbi->s_vat_inode->i_size - 36) >> 2;
1412 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1413 struct buffer_head *bh = NULL;
1414 uint32_t pos;
1415
1416 pos = udf_block_map(sbi->s_vat_inode, 0);
1417 bh = sb_bread(sb, pos);
1418 if (!bh)
1419 return 1;
1420 map->s_type_specific.s_virtual.s_start_offset =
1421 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data +
1422 udf_ext0_offset(sbi->s_vat_inode))->lengthHeader) +
1423 udf_ext0_offset(sbi->s_vat_inode);
1424 map->s_type_specific.s_virtual.s_num_entries = (sbi->s_vat_inode->i_size -
1425 map->s_type_specific.s_virtual.s_start_offset) >> 2;
1426 brelse(bh);
1427 }
1428 map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1429 map->s_partition_len =
1430 sbi->s_partmaps[ino.partitionReferenceNum].
1431 s_partition_len;
1432 }
1433 }
1434 return 0;
1435 }
1436
1437 static void udf_open_lvid(struct super_block *sb)
1438 {
1439 struct udf_sb_info *sbi = UDF_SB(sb);
1440 struct buffer_head *bh = sbi->s_lvid_bh;
1441 if (bh) {
1442 int i;
1443 kernel_timestamp cpu_time;
1444 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1445 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
1446
1447 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1448 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1449 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1450 lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1451 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1452
1453 lvid->descTag.descCRC = cpu_to_le16(udf_crc((char *)lvid + sizeof(tag),
1454 le16_to_cpu(lvid->descTag.descCRCLength), 0));
1455
1456 lvid->descTag.tagChecksum = 0;
1457 for (i = 0; i < 16; i++)
1458 if (i != 4)
1459 lvid->descTag.tagChecksum +=
1460 ((uint8_t *) &(lvid->descTag))[i];
1461
1462 mark_buffer_dirty(bh);
1463 }
1464 }
1465
1466 static void udf_close_lvid(struct super_block *sb)
1467 {
1468 kernel_timestamp cpu_time;
1469 int i;
1470 struct udf_sb_info *sbi = UDF_SB(sb);
1471 struct buffer_head *bh = sbi->s_lvid_bh;
1472 struct logicalVolIntegrityDesc *lvid;
1473
1474 if (!bh)
1475 return;
1476
1477 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1478
1479 if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1480 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
1481 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1482 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1483 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1484 lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1485 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1486 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1487 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1488 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1489 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1490 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1491 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1492
1493 lvid->descTag.descCRC =
1494 cpu_to_le16(udf_crc((char *)lvid + sizeof(tag),
1495 le16_to_cpu(lvid->descTag.descCRCLength), 0));
1496
1497 lvid->descTag.tagChecksum = 0;
1498 for (i = 0; i < 16; i++)
1499 if (i != 4)
1500 lvid->descTag.tagChecksum +=
1501 ((uint8_t *)&(lvid->descTag))[i];
1502
1503 mark_buffer_dirty(bh);
1504 }
1505 }
1506
1507 /*
1508 * udf_read_super
1509 *
1510 * PURPOSE
1511 * Complete the specified super block.
1512 *
1513 * PRE-CONDITIONS
1514 * sb Pointer to superblock to complete - never NULL.
1515 * sb->s_dev Device to read suberblock from.
1516 * options Pointer to mount options.
1517 * silent Silent flag.
1518 *
1519 * HISTORY
1520 * July 1, 1997 - Andrew E. Mileski
1521 * Written, tested, and released.
1522 */
1523 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1524 {
1525 int i;
1526 struct inode *inode = NULL;
1527 struct udf_options uopt;
1528 kernel_lb_addr rootdir, fileset;
1529 struct udf_sb_info *sbi;
1530
1531 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1532 uopt.uid = -1;
1533 uopt.gid = -1;
1534 uopt.umask = 0;
1535
1536 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1537 if (!sbi)
1538 return -ENOMEM;
1539
1540 sb->s_fs_info = sbi;
1541
1542 mutex_init(&sbi->s_alloc_mutex);
1543
1544 if (!udf_parse_options((char *)options, &uopt))
1545 goto error_out;
1546
1547 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1548 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1549 udf_error(sb, "udf_read_super",
1550 "utf8 cannot be combined with iocharset\n");
1551 goto error_out;
1552 }
1553 #ifdef CONFIG_UDF_NLS
1554 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1555 uopt.nls_map = load_nls_default();
1556 if (!uopt.nls_map)
1557 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1558 else
1559 udf_debug("Using default NLS map\n");
1560 }
1561 #endif
1562 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1563 uopt.flags |= (1 << UDF_FLAG_UTF8);
1564
1565 fileset.logicalBlockNum = 0xFFFFFFFF;
1566 fileset.partitionReferenceNum = 0xFFFF;
1567
1568 sbi->s_flags = uopt.flags;
1569 sbi->s_uid = uopt.uid;
1570 sbi->s_gid = uopt.gid;
1571 sbi->s_umask = uopt.umask;
1572 sbi->s_nls_map = uopt.nls_map;
1573
1574 /* Set the block size for all transfers */
1575 if (!udf_set_blocksize(sb, uopt.blocksize))
1576 goto error_out;
1577
1578 if (uopt.session == 0xFFFFFFFF)
1579 sbi->s_session = udf_get_last_session(sb);
1580 else
1581 sbi->s_session = uopt.session;
1582
1583 udf_debug("Multi-session=%d\n", sbi->s_session);
1584
1585 sbi->s_last_block = uopt.lastblock;
1586 sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1587 sbi->s_anchor[2] = uopt.anchor;
1588 sbi->s_anchor[3] = 256;
1589
1590 if (udf_check_valid(sb, uopt.novrs, silent)) {
1591 /* read volume recognition sequences */
1592 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1593 goto error_out;
1594 }
1595
1596 udf_find_anchor(sb);
1597
1598 /* Fill in the rest of the superblock */
1599 sb->s_op = &udf_sb_ops;
1600 sb->dq_op = NULL;
1601 sb->s_dirt = 0;
1602 sb->s_magic = UDF_SUPER_MAGIC;
1603 sb->s_time_gran = 1000;
1604
1605 if (udf_load_partition(sb, &fileset)) {
1606 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1607 goto error_out;
1608 }
1609
1610 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1611
1612 if (sbi->s_lvid_bh) {
1613 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sbi);
1614 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1615 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1616 /* uint16_t maxUDFWriteRev = le16_to_cpu(lvidiu->maxUDFWriteRev); */
1617
1618 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1619 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x (max is %x)\n",
1620 le16_to_cpu(lvidiu->minUDFReadRev),
1621 UDF_MAX_READ_VERSION);
1622 goto error_out;
1623 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1624 sb->s_flags |= MS_RDONLY;
1625 }
1626
1627 sbi->s_udfrev = minUDFWriteRev;
1628
1629 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1630 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1631 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1632 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1633 }
1634
1635 if (!sbi->s_partitions) {
1636 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1637 goto error_out;
1638 }
1639
1640 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & UDF_PART_FLAG_READ_ONLY) {
1641 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; forcing readonly mount\n");
1642 sb->s_flags |= MS_RDONLY;
1643 }
1644
1645 if (udf_find_fileset(sb, &fileset, &rootdir)) {
1646 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1647 goto error_out;
1648 }
1649
1650 if (!silent) {
1651 kernel_timestamp ts;
1652 udf_time_to_stamp(&ts, sbi->s_record_time);
1653 udf_info("UDF %s (%s) Mounting volume '%s', "
1654 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1655 UDFFS_VERSION, UDFFS_DATE,
1656 sbi->s_volume_ident, ts.year, ts.month, ts.day,
1657 ts.hour, ts.minute, ts.typeAndTimezone);
1658 }
1659 if (!(sb->s_flags & MS_RDONLY))
1660 udf_open_lvid(sb);
1661
1662 /* Assign the root inode */
1663 /* assign inodes by physical block number */
1664 /* perhaps it's not extensible enough, but for now ... */
1665 inode = udf_iget(sb, rootdir);
1666 if (!inode) {
1667 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1668 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1669 goto error_out;
1670 }
1671
1672 /* Allocate a dentry for the root inode */
1673 sb->s_root = d_alloc_root(inode);
1674 if (!sb->s_root) {
1675 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1676 iput(inode);
1677 goto error_out;
1678 }
1679 sb->s_maxbytes = MAX_LFS_FILESIZE;
1680 return 0;
1681
1682 error_out:
1683 if (sbi->s_vat_inode)
1684 iput(sbi->s_vat_inode);
1685 if (sbi->s_partitions) {
1686 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1687 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1688 iput(map->s_uspace.s_table);
1689 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1690 iput(map->s_fspace.s_table);
1691 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1692 UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_uspace);
1693 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1694 UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_fspace);
1695 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1696 for (i = 0; i < 4; i++)
1697 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1698 }
1699 #ifdef CONFIG_UDF_NLS
1700 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1701 unload_nls(sbi->s_nls_map);
1702 #endif
1703 if (!(sb->s_flags & MS_RDONLY))
1704 udf_close_lvid(sb);
1705 brelse(sbi->s_lvid_bh);
1706
1707 kfree(sbi->s_partmaps);
1708 kfree(sbi);
1709 sb->s_fs_info = NULL;
1710
1711 return -EINVAL;
1712 }
1713
1714 void udf_error(struct super_block *sb, const char *function,
1715 const char *fmt, ...)
1716 {
1717 va_list args;
1718
1719 if (!(sb->s_flags & MS_RDONLY)) {
1720 /* mark sb error */
1721 sb->s_dirt = 1;
1722 }
1723 va_start(args, fmt);
1724 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1725 va_end(args);
1726 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1727 sb->s_id, function, error_buf);
1728 }
1729
1730 void udf_warning(struct super_block *sb, const char *function,
1731 const char *fmt, ...)
1732 {
1733 va_list args;
1734
1735 va_start(args, fmt);
1736 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1737 va_end(args);
1738 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1739 sb->s_id, function, error_buf);
1740 }
1741
1742 /*
1743 * udf_put_super
1744 *
1745 * PURPOSE
1746 * Prepare for destruction of the superblock.
1747 *
1748 * DESCRIPTION
1749 * Called before the filesystem is unmounted.
1750 *
1751 * HISTORY
1752 * July 1, 1997 - Andrew E. Mileski
1753 * Written, tested, and released.
1754 */
1755 static void udf_put_super(struct super_block *sb)
1756 {
1757 int i;
1758 struct udf_sb_info *sbi;
1759
1760 sbi = UDF_SB(sb);
1761 if (sbi->s_vat_inode)
1762 iput(sbi->s_vat_inode);
1763 if (sbi->s_partitions) {
1764 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1765 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1766 iput(map->s_uspace.s_table);
1767 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1768 iput(map->s_fspace.s_table);
1769 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1770 UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_uspace);
1771 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1772 UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_fspace);
1773 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1774 for (i = 0; i < 4; i++)
1775 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1776 }
1777 #ifdef CONFIG_UDF_NLS
1778 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1779 unload_nls(sbi->s_nls_map);
1780 #endif
1781 if (!(sb->s_flags & MS_RDONLY))
1782 udf_close_lvid(sb);
1783 brelse(sbi->s_lvid_bh);
1784 kfree(sbi->s_partmaps);
1785 kfree(sb->s_fs_info);
1786 sb->s_fs_info = NULL;
1787 }
1788
1789 /*
1790 * udf_stat_fs
1791 *
1792 * PURPOSE
1793 * Return info about the filesystem.
1794 *
1795 * DESCRIPTION
1796 * Called by sys_statfs()
1797 *
1798 * HISTORY
1799 * July 1, 1997 - Andrew E. Mileski
1800 * Written, tested, and released.
1801 */
1802 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1803 {
1804 struct super_block *sb = dentry->d_sb;
1805 struct udf_sb_info *sbi = UDF_SB(sb);
1806 struct logicalVolIntegrityDescImpUse *lvidiu;
1807
1808 if (sbi->s_lvid_bh != NULL)
1809 lvidiu = udf_sb_lvidiu(sbi);
1810 else
1811 lvidiu = NULL;
1812
1813 buf->f_type = UDF_SUPER_MAGIC;
1814 buf->f_bsize = sb->s_blocksize;
1815 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1816 buf->f_bfree = udf_count_free(sb);
1817 buf->f_bavail = buf->f_bfree;
1818 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1819 le32_to_cpu(lvidiu->numDirs)) : 0)
1820 + buf->f_bfree;
1821 buf->f_ffree = buf->f_bfree;
1822 /* __kernel_fsid_t f_fsid */
1823 buf->f_namelen = UDF_NAME_LEN - 2;
1824
1825 return 0;
1826 }
1827
1828 static unsigned char udf_bitmap_lookup[16] = {
1829 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1830 };
1831
1832 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1833 {
1834 struct buffer_head *bh = NULL;
1835 unsigned int accum = 0;
1836 int index;
1837 int block = 0, newblock;
1838 kernel_lb_addr loc;
1839 uint32_t bytes;
1840 uint8_t value;
1841 uint8_t *ptr;
1842 uint16_t ident;
1843 struct spaceBitmapDesc *bm;
1844
1845 lock_kernel();
1846
1847 loc.logicalBlockNum = bitmap->s_extPosition;
1848 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1849 bh = udf_read_ptagged(sb, loc, 0, &ident);
1850
1851 if (!bh) {
1852 printk(KERN_ERR "udf: udf_count_free failed\n");
1853 goto out;
1854 } else if (ident != TAG_IDENT_SBD) {
1855 brelse(bh);
1856 printk(KERN_ERR "udf: udf_count_free failed\n");
1857 goto out;
1858 }
1859
1860 bm = (struct spaceBitmapDesc *)bh->b_data;
1861 bytes = le32_to_cpu(bm->numOfBytes);
1862 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1863 ptr = (uint8_t *)bh->b_data;
1864
1865 while (bytes > 0) {
1866 while ((bytes > 0) && (index < sb->s_blocksize)) {
1867 value = ptr[index];
1868 accum += udf_bitmap_lookup[value & 0x0f];
1869 accum += udf_bitmap_lookup[value >> 4];
1870 index++;
1871 bytes--;
1872 }
1873 if (bytes) {
1874 brelse(bh);
1875 newblock = udf_get_lb_pblock(sb, loc, ++block);
1876 bh = udf_tread(sb, newblock);
1877 if (!bh) {
1878 udf_debug("read failed\n");
1879 goto out;
1880 }
1881 index = 0;
1882 ptr = (uint8_t *)bh->b_data;
1883 }
1884 }
1885 brelse(bh);
1886
1887 out:
1888 unlock_kernel();
1889
1890 return accum;
1891 }
1892
1893 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1894 {
1895 unsigned int accum = 0;
1896 uint32_t elen;
1897 kernel_lb_addr eloc;
1898 int8_t etype;
1899 struct extent_position epos;
1900
1901 lock_kernel();
1902
1903 epos.block = UDF_I_LOCATION(table);
1904 epos.offset = sizeof(struct unallocSpaceEntry);
1905 epos.bh = NULL;
1906
1907 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1908 accum += (elen >> table->i_sb->s_blocksize_bits);
1909
1910 brelse(epos.bh);
1911
1912 unlock_kernel();
1913
1914 return accum;
1915 }
1916
1917 static unsigned int udf_count_free(struct super_block *sb)
1918 {
1919 unsigned int accum = 0;
1920 struct udf_sb_info *sbi;
1921 struct udf_part_map *map;
1922
1923 sbi = UDF_SB(sb);
1924 if (sbi->s_lvid_bh) {
1925 struct logicalVolIntegrityDesc *lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
1926 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
1927 accum = le32_to_cpu(lvid->freeSpaceTable[sbi->s_partition]);
1928 if (accum == 0xFFFFFFFF)
1929 accum = 0;
1930 }
1931 }
1932
1933 if (accum)
1934 return accum;
1935
1936 map = &sbi->s_partmaps[sbi->s_partition];
1937 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
1938 accum += udf_count_free_bitmap(sb,
1939 map->s_uspace.s_bitmap);
1940 }
1941 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
1942 accum += udf_count_free_bitmap(sb,
1943 map->s_fspace.s_bitmap);
1944 }
1945 if (accum)
1946 return accum;
1947
1948 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
1949 accum += udf_count_free_table(sb,
1950 map->s_uspace.s_table);
1951 }
1952 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
1953 accum += udf_count_free_table(sb,
1954 map->s_fspace.s_table);
1955 }
1956
1957 return accum;
1958 }
Support for the Chinese Samsung S3C2440 based development boards