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