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[IPV6] xfrm6_tunnel: Delete debugging code.
[linux-2.6.git] / fs / udf / super.c
blob4df822c881b69357038f96f0d91f6231f7da4a15
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 kmem_cache_t * 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, SLAB_KERNEL);
116 if (!ei)
117 return NULL;
118 return &ei->vfs_inode;
119 }
120
121 static void udf_destroy_inode(struct inode *inode)
122 {
123 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
124 }
125
126 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
127 {
128 struct udf_inode_info *ei = (struct udf_inode_info *) foo;
129
130 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
131 SLAB_CTOR_CONSTRUCTOR)
132 {
133 ei->i_ext.i_data = NULL;
134 inode_init_once(&ei->vfs_inode);
135 }
136 }
137
138 static int init_inodecache(void)
139 {
140 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
141 sizeof(struct udf_inode_info),
142 0, (SLAB_RECLAIM_ACCOUNT|
143 SLAB_MEM_SPREAD),
144 init_once, NULL);
145 if (udf_inode_cachep == NULL)
146 return -ENOMEM;
147 return 0;
148 }
149
150 static void destroy_inodecache(void)
151 {
152 if (kmem_cache_destroy(udf_inode_cachep))
153 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
154 }
155
156 /* Superblock operations */
157 static struct super_operations udf_sb_ops = {
158 .alloc_inode = udf_alloc_inode,
159 .destroy_inode = udf_destroy_inode,
160 .write_inode = udf_write_inode,
161 .delete_inode = udf_delete_inode,
162 .clear_inode = udf_clear_inode,
163 .put_super = udf_put_super,
164 .write_super = udf_write_super,
165 .statfs = udf_statfs,
166 .remount_fs = udf_remount_fs,
167 };
168
169 struct udf_options
170 {
171 unsigned char novrs;
172 unsigned int blocksize;
173 unsigned int session;
174 unsigned int lastblock;
175 unsigned int anchor;
176 unsigned int volume;
177 unsigned short partition;
178 unsigned int fileset;
179 unsigned int rootdir;
180 unsigned int flags;
181 mode_t umask;
182 gid_t gid;
183 uid_t uid;
184 struct nls_table *nls_map;
185 };
186
187 static int __init init_udf_fs(void)
188 {
189 int err;
190 err = init_inodecache();
191 if (err)
192 goto out1;
193 err = register_filesystem(&udf_fstype);
194 if (err)
195 goto out;
196 return 0;
197 out:
198 destroy_inodecache();
199 out1:
200 return err;
201 }
202
203 static void __exit exit_udf_fs(void)
204 {
205 unregister_filesystem(&udf_fstype);
206 destroy_inodecache();
207 }
208
209 module_init(init_udf_fs)
210 module_exit(exit_udf_fs)
211
212 /*
213 * udf_parse_options
214 *
215 * PURPOSE
216 * Parse mount options.
217 *
218 * DESCRIPTION
219 * The following mount options are supported:
220 *
221 * gid= Set the default group.
222 * umask= Set the default umask.
223 * uid= Set the default user.
224 * bs= Set the block size.
225 * unhide Show otherwise hidden files.
226 * undelete Show deleted files in lists.
227 * adinicb Embed data in the inode (default)
228 * noadinicb Don't embed data in the inode
229 * shortad Use short ad's
230 * longad Use long ad's (default)
231 * nostrict Unset strict conformance
232 * iocharset= Set the NLS character set
233 *
234 * The remaining are for debugging and disaster recovery:
235 *
236 * novrs Skip volume sequence recognition
237 *
238 * The following expect a offset from 0.
239 *
240 * session= Set the CDROM session (default= last session)
241 * anchor= Override standard anchor location. (default= 256)
242 * volume= Override the VolumeDesc location. (unused)
243 * partition= Override the PartitionDesc location. (unused)
244 * lastblock= Set the last block of the filesystem/
245 *
246 * The following expect a offset from the partition root.
247 *
248 * fileset= Override the fileset block location. (unused)
249 * rootdir= Override the root directory location. (unused)
250 * WARNING: overriding the rootdir to a non-directory may
251 * yield highly unpredictable results.
252 *
253 * PRE-CONDITIONS
254 * options Pointer to mount options string.
255 * uopts Pointer to mount options variable.
256 *
257 * POST-CONDITIONS
258 * <return> 1 Mount options parsed okay.
259 * <return> 0 Error parsing mount options.
260 *
261 * HISTORY
262 * July 1, 1997 - Andrew E. Mileski
263 * Written, tested, and released.
264 */
265
266 enum {
267 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
268 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
269 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
270 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
271 Opt_rootdir, Opt_utf8, Opt_iocharset,
272 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
273 };
274
275 static match_table_t tokens = {
276 {Opt_novrs, "novrs"},
277 {Opt_nostrict, "nostrict"},
278 {Opt_bs, "bs=%u"},
279 {Opt_unhide, "unhide"},
280 {Opt_undelete, "undelete"},
281 {Opt_noadinicb, "noadinicb"},
282 {Opt_adinicb, "adinicb"},
283 {Opt_shortad, "shortad"},
284 {Opt_longad, "longad"},
285 {Opt_uforget, "uid=forget"},
286 {Opt_uignore, "uid=ignore"},
287 {Opt_gforget, "gid=forget"},
288 {Opt_gignore, "gid=ignore"},
289 {Opt_gid, "gid=%u"},
290 {Opt_uid, "uid=%u"},
291 {Opt_umask, "umask=%o"},
292 {Opt_session, "session=%u"},
293 {Opt_lastblock, "lastblock=%u"},
294 {Opt_anchor, "anchor=%u"},
295 {Opt_volume, "volume=%u"},
296 {Opt_partition, "partition=%u"},
297 {Opt_fileset, "fileset=%u"},
298 {Opt_rootdir, "rootdir=%u"},
299 {Opt_utf8, "utf8"},
300 {Opt_iocharset, "iocharset=%s"},
301 {Opt_err, NULL}
302 };
303
304 static int
305 udf_parse_options(char *options, struct udf_options *uopt)
306 {
307 char *p;
308 int option;
309
310 uopt->novrs = 0;
311 uopt->blocksize = 2048;
312 uopt->partition = 0xFFFF;
313 uopt->session = 0xFFFFFFFF;
314 uopt->lastblock = 0;
315 uopt->anchor = 0;
316 uopt->volume = 0xFFFFFFFF;
317 uopt->rootdir = 0xFFFFFFFF;
318 uopt->fileset = 0xFFFFFFFF;
319 uopt->nls_map = NULL;
320
321 if (!options)
322 return 1;
323
324 while ((p = strsep(&options, ",")) != NULL)
325 {
326 substring_t args[MAX_OPT_ARGS];
327 int token;
328 if (!*p)
329 continue;
330
331 token = match_token(p, tokens, args);
332 switch (token)
333 {
334 case Opt_novrs:
335 uopt->novrs = 1;
336 case Opt_bs:
337 if (match_int(&args[0], &option))
338 return 0;
339 uopt->blocksize = option;
340 break;
341 case Opt_unhide:
342 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
343 break;
344 case Opt_undelete:
345 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
346 break;
347 case Opt_noadinicb:
348 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
349 break;
350 case Opt_adinicb:
351 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
352 break;
353 case Opt_shortad:
354 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
355 break;
356 case Opt_longad:
357 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
358 break;
359 case Opt_gid:
360 if (match_int(args, &option))
361 return 0;
362 uopt->gid = option;
363 break;
364 case Opt_uid:
365 if (match_int(args, &option))
366 return 0;
367 uopt->uid = option;
368 break;
369 case Opt_umask:
370 if (match_octal(args, &option))
371 return 0;
372 uopt->umask = option;
373 break;
374 case Opt_nostrict:
375 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
376 break;
377 case Opt_session:
378 if (match_int(args, &option))
379 return 0;
380 uopt->session = option;
381 break;
382 case Opt_lastblock:
383 if (match_int(args, &option))
384 return 0;
385 uopt->lastblock = option;
386 break;
387 case Opt_anchor:
388 if (match_int(args, &option))
389 return 0;
390 uopt->anchor = option;
391 break;
392 case Opt_volume:
393 if (match_int(args, &option))
394 return 0;
395 uopt->volume = option;
396 break;
397 case Opt_partition:
398 if (match_int(args, &option))
399 return 0;
400 uopt->partition = option;
401 break;
402 case Opt_fileset:
403 if (match_int(args, &option))
404 return 0;
405 uopt->fileset = option;
406 break;
407 case Opt_rootdir:
408 if (match_int(args, &option))
409 return 0;
410 uopt->rootdir = option;
411 break;
412 case Opt_utf8:
413 uopt->flags |= (1 << UDF_FLAG_UTF8);
414 break;
415 #ifdef CONFIG_UDF_NLS
416 case Opt_iocharset:
417 uopt->nls_map = load_nls(args[0].from);
418 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
419 break;
420 #endif
421 case Opt_uignore:
422 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
423 break;
424 case Opt_uforget:
425 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
426 break;
427 case Opt_gignore:
428 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
429 break;
430 case Opt_gforget:
431 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
432 break;
433 default:
434 printk(KERN_ERR "udf: bad mount option \"%s\" "
435 "or missing value\n", p);
436 return 0;
437 }
438 }
439 return 1;
440 }
441
442 void
443 udf_write_super(struct super_block *sb)
444 {
445 lock_kernel();
446 if (!(sb->s_flags & MS_RDONLY))
447 udf_open_lvid(sb);
448 sb->s_dirt = 0;
449 unlock_kernel();
450 }
451
452 static int
453 udf_remount_fs(struct super_block *sb, int *flags, char *options)
454 {
455 struct udf_options uopt;
456
457 uopt.flags = UDF_SB(sb)->s_flags ;
458 uopt.uid = UDF_SB(sb)->s_uid ;
459 uopt.gid = UDF_SB(sb)->s_gid ;
460 uopt.umask = UDF_SB(sb)->s_umask ;
461
462 if ( !udf_parse_options(options, &uopt) )
463 return -EINVAL;
464
465 UDF_SB(sb)->s_flags = uopt.flags;
466 UDF_SB(sb)->s_uid = uopt.uid;
467 UDF_SB(sb)->s_gid = uopt.gid;
468 UDF_SB(sb)->s_umask = uopt.umask;
469
470 if (UDF_SB_LVIDBH(sb)) {
471 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
472 if (write_rev > UDF_MAX_WRITE_VERSION)
473 *flags |= MS_RDONLY;
474 }
475
476 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
477 return 0;
478 if (*flags & MS_RDONLY)
479 udf_close_lvid(sb);
480 else
481 udf_open_lvid(sb);
482
483 return 0;
484 }
485
486 /*
487 * udf_set_blocksize
488 *
489 * PURPOSE
490 * Set the block size to be used in all transfers.
491 *
492 * DESCRIPTION
493 * To allow room for a DMA transfer, it is best to guess big when unsure.
494 * This routine picks 2048 bytes as the blocksize when guessing. This
495 * should be adequate until devices with larger block sizes become common.
496 *
497 * Note that the Linux kernel can currently only deal with blocksizes of
498 * 512, 1024, 2048, 4096, and 8192 bytes.
499 *
500 * PRE-CONDITIONS
501 * sb Pointer to _locked_ superblock.
502 *
503 * POST-CONDITIONS
504 * sb->s_blocksize Blocksize.
505 * sb->s_blocksize_bits log2 of blocksize.
506 * <return> 0 Blocksize is valid.
507 * <return> 1 Blocksize is invalid.
508 *
509 * HISTORY
510 * July 1, 1997 - Andrew E. Mileski
511 * Written, tested, and released.
512 */
513 static int
514 udf_set_blocksize(struct super_block *sb, int bsize)
515 {
516 if (!sb_min_blocksize(sb, bsize)) {
517 udf_debug("Bad block size (%d)\n", bsize);
518 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
519 return 0;
520 }
521 return sb->s_blocksize;
522 }
523
524 static int
525 udf_vrs(struct super_block *sb, int silent)
526 {
527 struct volStructDesc *vsd = NULL;
528 int sector = 32768;
529 int sectorsize;
530 struct buffer_head *bh = NULL;
531 int iso9660=0;
532 int nsr02=0;
533 int nsr03=0;
534
535 /* Block size must be a multiple of 512 */
536 if (sb->s_blocksize & 511)
537 return 0;
538
539 if (sb->s_blocksize < sizeof(struct volStructDesc))
540 sectorsize = sizeof(struct volStructDesc);
541 else
542 sectorsize = sb->s_blocksize;
543
544 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
545
546 udf_debug("Starting at sector %u (%ld byte sectors)\n",
547 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
548 /* Process the sequence (if applicable) */
549 for (;!nsr02 && !nsr03; sector += sectorsize)
550 {
551 /* Read a block */
552 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
553 if (!bh)
554 break;
555
556 /* Look for ISO descriptors */
557 vsd = (struct volStructDesc *)(bh->b_data +
558 (sector & (sb->s_blocksize - 1)));
559
560 if (vsd->stdIdent[0] == 0)
561 {
562 udf_release_data(bh);
563 break;
564 }
565 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
566 {
567 iso9660 = sector;
568 switch (vsd->structType)
569 {
570 case 0:
571 udf_debug("ISO9660 Boot Record found\n");
572 break;
573 case 1:
574 udf_debug("ISO9660 Primary Volume Descriptor found\n");
575 break;
576 case 2:
577 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
578 break;
579 case 3:
580 udf_debug("ISO9660 Volume Partition Descriptor found\n");
581 break;
582 case 255:
583 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
584 break;
585 default:
586 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
587 break;
588 }
589 }
590 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
591 {
592 }
593 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
594 {
595 udf_release_data(bh);
596 break;
597 }
598 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
599 {
600 nsr02 = sector;
601 }
602 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
603 {
604 nsr03 = sector;
605 }
606 udf_release_data(bh);
607 }
608
609 if (nsr03)
610 return nsr03;
611 else if (nsr02)
612 return nsr02;
613 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
614 return -1;
615 else
616 return 0;
617 }
618
619 /*
620 * udf_find_anchor
621 *
622 * PURPOSE
623 * Find an anchor volume descriptor.
624 *
625 * PRE-CONDITIONS
626 * sb Pointer to _locked_ superblock.
627 * lastblock Last block on media.
628 *
629 * POST-CONDITIONS
630 * <return> 1 if not found, 0 if ok
631 *
632 * HISTORY
633 * July 1, 1997 - Andrew E. Mileski
634 * Written, tested, and released.
635 */
636 static void
637 udf_find_anchor(struct super_block *sb)
638 {
639 int lastblock = UDF_SB_LASTBLOCK(sb);
640 struct buffer_head *bh = NULL;
641 uint16_t ident;
642 uint32_t location;
643 int i;
644
645 if (lastblock)
646 {
647 int varlastblock = udf_variable_to_fixed(lastblock);
648 int last[] = { lastblock, lastblock - 2,
649 lastblock - 150, lastblock - 152,
650 varlastblock, varlastblock - 2,
651 varlastblock - 150, varlastblock - 152 };
652
653 lastblock = 0;
654
655 /* Search for an anchor volume descriptor pointer */
656
657 /* according to spec, anchor is in either:
658 * block 256
659 * lastblock-256
660 * lastblock
661 * however, if the disc isn't closed, it could be 512 */
662
663 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
664 if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
665 {
666 ident = location = 0;
667 }
668 else
669 {
670 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
671 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
672 udf_release_data(bh);
673 }
674
675 if (ident == TAG_IDENT_AVDP)
676 {
677 if (location == last[i] - UDF_SB_SESSION(sb))
678 {
679 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
680 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
681 }
682 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
683 {
684 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
685 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
686 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
687 }
688 else
689 udf_debug("Anchor found at block %d, location mismatch %d.\n",
690 last[i], location);
691 }
692 else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
693 {
694 lastblock = last[i];
695 UDF_SB_ANCHOR(sb)[3] = 512;
696 }
697 else
698 {
699 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
700 {
701 ident = location = 0;
702 }
703 else
704 {
705 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
706 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
707 udf_release_data(bh);
708 }
709
710 if (ident == TAG_IDENT_AVDP &&
711 location == last[i] - 256 - UDF_SB_SESSION(sb))
712 {
713 lastblock = last[i];
714 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
715 }
716 else
717 {
718 if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
719 {
720 ident = location = 0;
721 }
722 else
723 {
724 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
725 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
726 udf_release_data(bh);
727 }
728
729 if (ident == TAG_IDENT_AVDP &&
730 location == udf_variable_to_fixed(last[i]) - 256)
731 {
732 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
733 lastblock = udf_variable_to_fixed(last[i]);
734 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
735 }
736 }
737 }
738 }
739 }
740
741 if (!lastblock)
742 {
743 /* We havn't found the lastblock. check 312 */
744 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
745 {
746 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
747 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
748 udf_release_data(bh);
749
750 if (ident == TAG_IDENT_AVDP && location == 256)
751 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
752 }
753 }
754
755 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
756 if (UDF_SB_ANCHOR(sb)[i])
757 {
758 if (!(bh = udf_read_tagged(sb,
759 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
760 {
761 UDF_SB_ANCHOR(sb)[i] = 0;
762 }
763 else
764 {
765 udf_release_data(bh);
766 if ((ident != TAG_IDENT_AVDP) && (i ||
767 (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
768 {
769 UDF_SB_ANCHOR(sb)[i] = 0;
770 }
771 }
772 }
773 }
774
775 UDF_SB_LASTBLOCK(sb) = lastblock;
776 }
777
778 static int
779 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
780 {
781 struct buffer_head *bh = NULL;
782 long lastblock;
783 uint16_t ident;
784
785 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
786 fileset->partitionReferenceNum != 0xFFFF)
787 {
788 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
789
790 if (!bh)
791 return 1;
792 else if (ident != TAG_IDENT_FSD)
793 {
794 udf_release_data(bh);
795 return 1;
796 }
797
798 }
799
800 if (!bh) /* Search backwards through the partitions */
801 {
802 kernel_lb_addr newfileset;
803
804 return 1;
805
806 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
807 (newfileset.partitionReferenceNum != 0xFFFF &&
808 fileset->logicalBlockNum == 0xFFFFFFFF &&
809 fileset->partitionReferenceNum == 0xFFFF);
810 newfileset.partitionReferenceNum--)
811 {
812 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
813 newfileset.logicalBlockNum = 0;
814
815 do
816 {
817 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
818 if (!bh)
819 {
820 newfileset.logicalBlockNum ++;
821 continue;
822 }
823
824 switch (ident)
825 {
826 case TAG_IDENT_SBD:
827 {
828 struct spaceBitmapDesc *sp;
829 sp = (struct spaceBitmapDesc *)bh->b_data;
830 newfileset.logicalBlockNum += 1 +
831 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
832 >> sb->s_blocksize_bits);
833 udf_release_data(bh);
834 break;
835 }
836 case TAG_IDENT_FSD:
837 {
838 *fileset = newfileset;
839 break;
840 }
841 default:
842 {
843 newfileset.logicalBlockNum ++;
844 udf_release_data(bh);
845 bh = NULL;
846 break;
847 }
848 }
849 }
850 while (newfileset.logicalBlockNum < lastblock &&
851 fileset->logicalBlockNum == 0xFFFFFFFF &&
852 fileset->partitionReferenceNum == 0xFFFF);
853 }
854 }
855
856 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
857 fileset->partitionReferenceNum != 0xFFFF) && bh)
858 {
859 udf_debug("Fileset at block=%d, partition=%d\n",
860 fileset->logicalBlockNum, fileset->partitionReferenceNum);
861
862 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
863 udf_load_fileset(sb, bh, root);
864 udf_release_data(bh);
865 return 0;
866 }
867 return 1;
868 }
869
870 static void
871 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
872 {
873 struct primaryVolDesc *pvoldesc;
874 time_t recording;
875 long recording_usec;
876 struct ustr instr;
877 struct ustr outstr;
878
879 pvoldesc = (struct primaryVolDesc *)bh->b_data;
880
881 if ( udf_stamp_to_time(&recording, &recording_usec,
882 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
883 {
884 kernel_timestamp ts;
885 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
886 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
887 recording, recording_usec,
888 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
889 UDF_SB_RECORDTIME(sb).tv_sec = recording;
890 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
891 }
892
893 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
894 {
895 if (udf_CS0toUTF8(&outstr, &instr))
896 {
897 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
898 outstr.u_len > 31 ? 31 : outstr.u_len);
899 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
900 }
901 }
902
903 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
904 {
905 if (udf_CS0toUTF8(&outstr, &instr))
906 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
907 }
908 }
909
910 static void
911 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
912 {
913 struct fileSetDesc *fset;
914
915 fset = (struct fileSetDesc *)bh->b_data;
916
917 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
918
919 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
920
921 udf_debug("Rootdir at block=%d, partition=%d\n",
922 root->logicalBlockNum, root->partitionReferenceNum);
923 }
924
925 static void
926 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
927 {
928 struct partitionDesc *p;
929 int i;
930
931 p = (struct partitionDesc *)bh->b_data;
932
933 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
934 {
935 udf_debug("Searching map: (%d == %d)\n",
936 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
937 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
938 {
939 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
940 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
941 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
942 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
943 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
944 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
945 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
946 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
947 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
948 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
949
950 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
951 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
952 {
953 struct partitionHeaderDesc *phd;
954
955 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
956 if (phd->unallocSpaceTable.extLength)
957 {
958 kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
959
960 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
961 udf_iget(sb, loc);
962 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
963 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
964 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
965 }
966 if (phd->unallocSpaceBitmap.extLength)
967 {
968 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
969 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
970 {
971 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
972 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
973 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
974 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
975 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
976 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
977 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
978 }
979 }
980 if (phd->partitionIntegrityTable.extLength)
981 udf_debug("partitionIntegrityTable (part %d)\n", i);
982 if (phd->freedSpaceTable.extLength)
983 {
984 kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
985
986 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
987 udf_iget(sb, loc);
988 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
989 udf_debug("freedSpaceTable (part %d) @ %ld\n",
990 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
991 }
992 if (phd->freedSpaceBitmap.extLength)
993 {
994 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
995 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
996 {
997 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
998 le32_to_cpu(phd->freedSpaceBitmap.extLength);
999 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1000 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1001 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1002 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1003 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1004 }
1005 }
1006 }
1007 break;
1008 }
1009 }
1010 if (i == UDF_SB_NUMPARTS(sb))
1011 {
1012 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1013 }
1014 else
1015 {
1016 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1017 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1018 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1019 }
1020 }
1021
1022 static int
1023 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1024 {
1025 struct logicalVolDesc *lvd;
1026 int i, j, offset;
1027 uint8_t type;
1028
1029 lvd = (struct logicalVolDesc *)bh->b_data;
1030
1031 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1032
1033 for (i=0,offset=0;
1034 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1035 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1036 {
1037 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1038 if (type == 1)
1039 {
1040 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1041 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1042 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1043 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1044 UDF_SB_PARTFUNC(sb,i) = NULL;
1045 }
1046 else if (type == 2)
1047 {
1048 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1049 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1050 {
1051 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1052 {
1053 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1054 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1055 }
1056 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1057 {
1058 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1059 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1060 }
1061 }
1062 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1063 {
1064 uint32_t loc;
1065 uint16_t ident;
1066 struct sparingTable *st;
1067 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1068
1069 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1070 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1071 for (j=0; j<spm->numSparingTables; j++)
1072 {
1073 loc = le32_to_cpu(spm->locSparingTable[j]);
1074 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1075 udf_read_tagged(sb, loc, loc, &ident);
1076 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1077 {
1078 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1079 if (ident != 0 ||
1080 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1081 {
1082 udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1083 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1084 }
1085 }
1086 }
1087 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1088 }
1089 else
1090 {
1091 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1092 continue;
1093 }
1094 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1095 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1096 }
1097 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1098 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1099 }
1100
1101 if (fileset)
1102 {
1103 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1104
1105 *fileset = lelb_to_cpu(la->extLocation);
1106 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1107 fileset->logicalBlockNum,
1108 fileset->partitionReferenceNum);
1109 }
1110 if (lvd->integritySeqExt.extLength)
1111 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1112 return 0;
1113 }
1114
1115 /*
1116 * udf_load_logicalvolint
1117 *
1118 */
1119 static void
1120 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1121 {
1122 struct buffer_head *bh = NULL;
1123 uint16_t ident;
1124
1125 while (loc.extLength > 0 &&
1126 (bh = udf_read_tagged(sb, loc.extLocation,
1127 loc.extLocation, &ident)) &&
1128 ident == TAG_IDENT_LVID)
1129 {
1130 UDF_SB_LVIDBH(sb) = bh;
1131
1132 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1133 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1134
1135 if (UDF_SB_LVIDBH(sb) != bh)
1136 udf_release_data(bh);
1137 loc.extLength -= sb->s_blocksize;
1138 loc.extLocation ++;
1139 }
1140 if (UDF_SB_LVIDBH(sb) != bh)
1141 udf_release_data(bh);
1142 }
1143
1144 /*
1145 * udf_process_sequence
1146 *
1147 * PURPOSE
1148 * Process a main/reserve volume descriptor sequence.
1149 *
1150 * PRE-CONDITIONS
1151 * sb Pointer to _locked_ superblock.
1152 * block First block of first extent of the sequence.
1153 * lastblock Lastblock of first extent of the sequence.
1154 *
1155 * HISTORY
1156 * July 1, 1997 - Andrew E. Mileski
1157 * Written, tested, and released.
1158 */
1159 static int
1160 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1161 {
1162 struct buffer_head *bh = NULL;
1163 struct udf_vds_record vds[VDS_POS_LENGTH];
1164 struct generic_desc *gd;
1165 struct volDescPtr *vdp;
1166 int done=0;
1167 int i,j;
1168 uint32_t vdsn;
1169 uint16_t ident;
1170 long next_s = 0, next_e = 0;
1171
1172 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1173
1174 /* Read the main descriptor sequence */
1175 for (;(!done && block <= lastblock); block++)
1176 {
1177
1178 bh = udf_read_tagged(sb, block, block, &ident);
1179 if (!bh)
1180 break;
1181
1182 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1183 gd = (struct generic_desc *)bh->b_data;
1184 vdsn = le32_to_cpu(gd->volDescSeqNum);
1185 switch (ident)
1186 {
1187 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1188 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1189 {
1190 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1191 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1192 }
1193 break;
1194 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1195 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1196 {
1197 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1198 vds[VDS_POS_VOL_DESC_PTR].block = block;
1199
1200 vdp = (struct volDescPtr *)bh->b_data;
1201 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1202 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1203 next_e = next_e >> sb->s_blocksize_bits;
1204 next_e += next_s;
1205 }
1206 break;
1207 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1208 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1209 {
1210 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1211 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1212 }
1213 break;
1214 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1215 if (!vds[VDS_POS_PARTITION_DESC].block)
1216 vds[VDS_POS_PARTITION_DESC].block = block;
1217 break;
1218 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1219 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1220 {
1221 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1222 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1223 }
1224 break;
1225 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1226 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1227 {
1228 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1229 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1230 }
1231 break;
1232 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1233 vds[VDS_POS_TERMINATING_DESC].block = block;
1234 if (next_e)
1235 {
1236 block = next_s;
1237 lastblock = next_e;
1238 next_s = next_e = 0;
1239 }
1240 else
1241 done = 1;
1242 break;
1243 }
1244 udf_release_data(bh);
1245 }
1246 for (i=0; i<VDS_POS_LENGTH; i++)
1247 {
1248 if (vds[i].block)
1249 {
1250 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1251
1252 if (i == VDS_POS_PRIMARY_VOL_DESC)
1253 udf_load_pvoldesc(sb, bh);
1254 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1255 udf_load_logicalvol(sb, bh, fileset);
1256 else if (i == VDS_POS_PARTITION_DESC)
1257 {
1258 struct buffer_head *bh2 = NULL;
1259 udf_load_partdesc(sb, bh);
1260 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1261 {
1262 bh2 = udf_read_tagged(sb, j, j, &ident);
1263 gd = (struct generic_desc *)bh2->b_data;
1264 if (ident == TAG_IDENT_PD)
1265 udf_load_partdesc(sb, bh2);
1266 udf_release_data(bh2);
1267 }
1268 }
1269 udf_release_data(bh);
1270 }
1271 }
1272
1273 return 0;
1274 }
1275
1276 /*
1277 * udf_check_valid()
1278 */
1279 static int
1280 udf_check_valid(struct super_block *sb, int novrs, int silent)
1281 {
1282 long block;
1283
1284 if (novrs)
1285 {
1286 udf_debug("Validity check skipped because of novrs option\n");
1287 return 0;
1288 }
1289 /* Check that it is NSR02 compliant */
1290 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1291 else if ((block = udf_vrs(sb, silent)) == -1)
1292 {
1293 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1294 if (!UDF_SB_LASTBLOCK(sb))
1295 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1296 return 0;
1297 }
1298 else
1299 return !block;
1300 }
1301
1302 static int
1303 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1304 {
1305 struct anchorVolDescPtr *anchor;
1306 uint16_t ident;
1307 struct buffer_head *bh;
1308 long main_s, main_e, reserve_s, reserve_e;
1309 int i, j;
1310
1311 if (!sb)
1312 return 1;
1313
1314 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1315 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1316 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1317 {
1318 anchor = (struct anchorVolDescPtr *)bh->b_data;
1319
1320 /* Locate the main sequence */
1321 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1322 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1323 main_e = main_e >> sb->s_blocksize_bits;
1324 main_e += main_s;
1325
1326 /* Locate the reserve sequence */
1327 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1328 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1329 reserve_e = reserve_e >> sb->s_blocksize_bits;
1330 reserve_e += reserve_s;
1331
1332 udf_release_data(bh);
1333
1334 /* Process the main & reserve sequences */
1335 /* responsible for finding the PartitionDesc(s) */
1336 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1337 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1338 {
1339 break;
1340 }
1341 }
1342 }
1343
1344 if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1345 udf_debug("No Anchor block found\n");
1346 return 1;
1347 } else
1348 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1349
1350 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1351 {
1352 switch UDF_SB_PARTTYPE(sb, i)
1353 {
1354 case UDF_VIRTUAL_MAP15:
1355 case UDF_VIRTUAL_MAP20:
1356 {
1357 kernel_lb_addr ino;
1358
1359 if (!UDF_SB_LASTBLOCK(sb))
1360 {
1361 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1362 udf_find_anchor(sb);
1363 }
1364
1365 if (!UDF_SB_LASTBLOCK(sb))
1366 {
1367 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1368 return 1;
1369 }
1370
1371 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1372 {
1373 if (j != i &&
1374 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1375 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1376 {
1377 ino.partitionReferenceNum = j;
1378 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1379 UDF_SB_PARTROOT(sb,j);
1380 break;
1381 }
1382 }
1383
1384 if (j == UDF_SB_NUMPARTS(sb))
1385 return 1;
1386
1387 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1388 return 1;
1389
1390 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1391 {
1392 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1393 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1394 }
1395 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1396 {
1397 struct buffer_head *bh = NULL;
1398 uint32_t pos;
1399
1400 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1401 bh = sb_bread(sb, pos);
1402 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1403 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1404 udf_ext0_offset(UDF_SB_VAT(sb));
1405 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1406 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1407 udf_release_data(bh);
1408 }
1409 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1410 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1411 }
1412 }
1413 }
1414 return 0;
1415 }
1416
1417 static void udf_open_lvid(struct super_block *sb)
1418 {
1419 if (UDF_SB_LVIDBH(sb))
1420 {
1421 int i;
1422 kernel_timestamp cpu_time;
1423
1424 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1425 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1426 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1427 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1428 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1429
1430 UDF_SB_LVID(sb)->descTag.descCRC =
1431 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1432 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1433
1434 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1435 for (i=0; i<16; i++)
1436 if (i != 4)
1437 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1438 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1439
1440 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1441 }
1442 }
1443
1444 static void udf_close_lvid(struct super_block *sb)
1445 {
1446 if (UDF_SB_LVIDBH(sb) &&
1447 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1448 {
1449 int i;
1450 kernel_timestamp cpu_time;
1451
1452 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1453 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1454 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1455 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1456 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1457 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1458 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1459 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1460 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1461 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1462 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1463
1464 UDF_SB_LVID(sb)->descTag.descCRC =
1465 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1466 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1467
1468 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1469 for (i=0; i<16; i++)
1470 if (i != 4)
1471 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1472 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1473
1474 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1475 }
1476 }
1477
1478 /*
1479 * udf_read_super
1480 *
1481 * PURPOSE
1482 * Complete the specified super block.
1483 *
1484 * PRE-CONDITIONS
1485 * sb Pointer to superblock to complete - never NULL.
1486 * sb->s_dev Device to read suberblock from.
1487 * options Pointer to mount options.
1488 * silent Silent flag.
1489 *
1490 * HISTORY
1491 * July 1, 1997 - Andrew E. Mileski
1492 * Written, tested, and released.
1493 */
1494 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1495 {
1496 int i;
1497 struct inode *inode=NULL;
1498 struct udf_options uopt;
1499 kernel_lb_addr rootdir, fileset;
1500 struct udf_sb_info *sbi;
1501
1502 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1503 uopt.uid = -1;
1504 uopt.gid = -1;
1505 uopt.umask = 0;
1506
1507 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1508 if (!sbi)
1509 return -ENOMEM;
1510 sb->s_fs_info = sbi;
1511 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1512
1513 mutex_init(&sbi->s_alloc_mutex);
1514
1515 if (!udf_parse_options((char *)options, &uopt))
1516 goto error_out;
1517
1518 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1519 uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1520 {
1521 udf_error(sb, "udf_read_super",
1522 "utf8 cannot be combined with iocharset\n");
1523 goto error_out;
1524 }
1525 #ifdef CONFIG_UDF_NLS
1526 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1527 {
1528 uopt.nls_map = load_nls_default();
1529 if (!uopt.nls_map)
1530 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1531 else
1532 udf_debug("Using default NLS map\n");
1533 }
1534 #endif
1535 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1536 uopt.flags |= (1 << UDF_FLAG_UTF8);
1537
1538 fileset.logicalBlockNum = 0xFFFFFFFF;
1539 fileset.partitionReferenceNum = 0xFFFF;
1540
1541 UDF_SB(sb)->s_flags = uopt.flags;
1542 UDF_SB(sb)->s_uid = uopt.uid;
1543 UDF_SB(sb)->s_gid = uopt.gid;
1544 UDF_SB(sb)->s_umask = uopt.umask;
1545 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1546
1547 /* Set the block size for all transfers */
1548 if (!udf_set_blocksize(sb, uopt.blocksize))
1549 goto error_out;
1550
1551 if ( uopt.session == 0xFFFFFFFF )
1552 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1553 else
1554 UDF_SB_SESSION(sb) = uopt.session;
1555
1556 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1557
1558 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1559 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1560 UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1561 UDF_SB_ANCHOR(sb)[3] = 256;
1562
1563 if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1564 {
1565 printk("UDF-fs: No VRS found\n");
1566 goto error_out;
1567 }
1568
1569 udf_find_anchor(sb);
1570
1571 /* Fill in the rest of the superblock */
1572 sb->s_op = &udf_sb_ops;
1573 sb->dq_op = NULL;
1574 sb->s_dirt = 0;
1575 sb->s_magic = UDF_SUPER_MAGIC;
1576 sb->s_time_gran = 1000;
1577
1578 if (udf_load_partition(sb, &fileset))
1579 {
1580 printk("UDF-fs: No partition found (1)\n");
1581 goto error_out;
1582 }
1583
1584 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1585
1586 if ( UDF_SB_LVIDBH(sb) )
1587 {
1588 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1589 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1590 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1591
1592 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1593 {
1594 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1595 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1596 UDF_MAX_READ_VERSION);
1597 goto error_out;
1598 }
1599 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1600 {
1601 sb->s_flags |= MS_RDONLY;
1602 }
1603
1604 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1605
1606 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1607 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1608 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1609 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1610 }
1611
1612 if ( !UDF_SB_NUMPARTS(sb) )
1613 {
1614 printk("UDF-fs: No partition found (2)\n");
1615 goto error_out;
1616 }
1617
1618 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1619 {
1620 printk("UDF-fs: No fileset found\n");
1621 goto error_out;
1622 }
1623
1624 if (!silent)
1625 {
1626 kernel_timestamp ts;
1627 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1628 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1629 UDFFS_VERSION, UDFFS_DATE,
1630 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1631 ts.typeAndTimezone);
1632 }
1633 if (!(sb->s_flags & MS_RDONLY))
1634 udf_open_lvid(sb);
1635
1636 /* Assign the root inode */
1637 /* assign inodes by physical block number */
1638 /* perhaps it's not extensible enough, but for now ... */
1639 inode = udf_iget(sb, rootdir);
1640 if (!inode)
1641 {
1642 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1643 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1644 goto error_out;
1645 }
1646
1647 /* Allocate a dentry for the root inode */
1648 sb->s_root = d_alloc_root(inode);
1649 if (!sb->s_root)
1650 {
1651 printk("UDF-fs: Couldn't allocate root dentry\n");
1652 iput(inode);
1653 goto error_out;
1654 }
1655 sb->s_maxbytes = MAX_LFS_FILESIZE;
1656 return 0;
1657
1658 error_out:
1659 if (UDF_SB_VAT(sb))
1660 iput(UDF_SB_VAT(sb));
1661 if (UDF_SB_NUMPARTS(sb))
1662 {
1663 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1664 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1665 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1666 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1667 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1668 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1669 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1670 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1671 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1672 {
1673 for (i=0; i<4; i++)
1674 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1675 }
1676 }
1677 #ifdef CONFIG_UDF_NLS
1678 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1679 unload_nls(UDF_SB(sb)->s_nls_map);
1680 #endif
1681 if (!(sb->s_flags & MS_RDONLY))
1682 udf_close_lvid(sb);
1683 udf_release_data(UDF_SB_LVIDBH(sb));
1684 UDF_SB_FREE(sb);
1685 kfree(sbi);
1686 sb->s_fs_info = NULL;
1687 return -EINVAL;
1688 }
1689
1690 void udf_error(struct super_block *sb, const char *function,
1691 const char *fmt, ...)
1692 {
1693 va_list args;
1694
1695 if (!(sb->s_flags & MS_RDONLY))
1696 {
1697 /* mark sb error */
1698 sb->s_dirt = 1;
1699 }
1700 va_start(args, fmt);
1701 vsprintf(error_buf, fmt, args);
1702 va_end(args);
1703 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1704 sb->s_id, function, error_buf);
1705 }
1706
1707 void udf_warning(struct super_block *sb, const char *function,
1708 const char *fmt, ...)
1709 {
1710 va_list args;
1711
1712 va_start (args, fmt);
1713 vsprintf(error_buf, fmt, args);
1714 va_end(args);
1715 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1716 sb->s_id, function, error_buf);
1717 }
1718
1719 /*
1720 * udf_put_super
1721 *
1722 * PURPOSE
1723 * Prepare for destruction of the superblock.
1724 *
1725 * DESCRIPTION
1726 * Called before the filesystem is unmounted.
1727 *
1728 * HISTORY
1729 * July 1, 1997 - Andrew E. Mileski
1730 * Written, tested, and released.
1731 */
1732 static void
1733 udf_put_super(struct super_block *sb)
1734 {
1735 int i;
1736
1737 if (UDF_SB_VAT(sb))
1738 iput(UDF_SB_VAT(sb));
1739 if (UDF_SB_NUMPARTS(sb))
1740 {
1741 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1742 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1743 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1744 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1745 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1746 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1747 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1748 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1749 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1750 {
1751 for (i=0; i<4; i++)
1752 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1753 }
1754 }
1755 #ifdef CONFIG_UDF_NLS
1756 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1757 unload_nls(UDF_SB(sb)->s_nls_map);
1758 #endif
1759 if (!(sb->s_flags & MS_RDONLY))
1760 udf_close_lvid(sb);
1761 udf_release_data(UDF_SB_LVIDBH(sb));
1762 UDF_SB_FREE(sb);
1763 kfree(sb->s_fs_info);
1764 sb->s_fs_info = NULL;
1765 }
1766
1767 /*
1768 * udf_stat_fs
1769 *
1770 * PURPOSE
1771 * Return info about the filesystem.
1772 *
1773 * DESCRIPTION
1774 * Called by sys_statfs()
1775 *
1776 * HISTORY
1777 * July 1, 1997 - Andrew E. Mileski
1778 * Written, tested, and released.
1779 */
1780 static int
1781 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1782 {
1783 struct super_block *sb = dentry->d_sb;
1784
1785 buf->f_type = UDF_SUPER_MAGIC;
1786 buf->f_bsize = sb->s_blocksize;
1787 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1788 buf->f_bfree = udf_count_free(sb);
1789 buf->f_bavail = buf->f_bfree;
1790 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1791 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1792 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1793 buf->f_ffree = buf->f_bfree;
1794 /* __kernel_fsid_t f_fsid */
1795 buf->f_namelen = UDF_NAME_LEN-2;
1796
1797 return 0;
1798 }
1799
1800 static unsigned char udf_bitmap_lookup[16] = {
1801 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1802 };
1803
1804 static unsigned int
1805 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1806 {
1807 struct buffer_head *bh = NULL;
1808 unsigned int accum = 0;
1809 int index;
1810 int block = 0, newblock;
1811 kernel_lb_addr loc;
1812 uint32_t bytes;
1813 uint8_t value;
1814 uint8_t *ptr;
1815 uint16_t ident;
1816 struct spaceBitmapDesc *bm;
1817
1818 lock_kernel();
1819
1820 loc.logicalBlockNum = bitmap->s_extPosition;
1821 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1822 bh = udf_read_ptagged(sb, loc, 0, &ident);
1823
1824 if (!bh)
1825 {
1826 printk(KERN_ERR "udf: udf_count_free failed\n");
1827 goto out;
1828 }
1829 else if (ident != TAG_IDENT_SBD)
1830 {
1831 udf_release_data(bh);
1832 printk(KERN_ERR "udf: udf_count_free failed\n");
1833 goto out;
1834 }
1835
1836 bm = (struct spaceBitmapDesc *)bh->b_data;
1837 bytes = le32_to_cpu(bm->numOfBytes);
1838 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1839 ptr = (uint8_t *)bh->b_data;
1840
1841 while ( bytes > 0 )
1842 {
1843 while ((bytes > 0) && (index < sb->s_blocksize))
1844 {
1845 value = ptr[index];
1846 accum += udf_bitmap_lookup[ value & 0x0f ];
1847 accum += udf_bitmap_lookup[ value >> 4 ];
1848 index++;
1849 bytes--;
1850 }
1851 if ( bytes )
1852 {
1853 udf_release_data(bh);
1854 newblock = udf_get_lb_pblock(sb, loc, ++block);
1855 bh = udf_tread(sb, newblock);
1856 if (!bh)
1857 {
1858 udf_debug("read failed\n");
1859 goto out;
1860 }
1861 index = 0;
1862 ptr = (uint8_t *)bh->b_data;
1863 }
1864 }
1865 udf_release_data(bh);
1866
1867 out:
1868 unlock_kernel();
1869
1870 return accum;
1871 }
1872
1873 static unsigned int
1874 udf_count_free_table(struct super_block *sb, struct inode * table)
1875 {
1876 unsigned int accum = 0;
1877 uint32_t extoffset, elen;
1878 kernel_lb_addr bloc, eloc;
1879 int8_t etype;
1880 struct buffer_head *bh = NULL;
1881
1882 lock_kernel();
1883
1884 bloc = UDF_I_LOCATION(table);
1885 extoffset = sizeof(struct unallocSpaceEntry);
1886
1887 while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1888 {
1889 accum += (elen >> table->i_sb->s_blocksize_bits);
1890 }
1891 udf_release_data(bh);
1892
1893 unlock_kernel();
1894
1895 return accum;
1896 }
1897
1898 static unsigned int
1899 udf_count_free(struct super_block *sb)
1900 {
1901 unsigned int accum = 0;
1902
1903 if (UDF_SB_LVIDBH(sb))
1904 {
1905 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1906 {
1907 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1908
1909 if (accum == 0xFFFFFFFF)
1910 accum = 0;
1911 }
1912 }
1913
1914 if (accum)
1915 return accum;
1916
1917 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1918 {
1919 accum += udf_count_free_bitmap(sb,
1920 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1921 }
1922 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1923 {
1924 accum += udf_count_free_bitmap(sb,
1925 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1926 }
1927 if (accum)
1928 return accum;
1929
1930 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1931 {
1932 accum += udf_count_free_table(sb,
1933 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1934 }
1935 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1936 {
1937 accum += udf_count_free_table(sb,
1938 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1939 }
1940
1941 return accum;
1942 }
Linus' kernel tree