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[ALSA] snd-emu10k1: Add a comment explaining the conversion function for dB gain.
[linux-2.6.22.y-op.git] / fs / udf / super.c
blobfcce1a21a51bdc1c0a095ccc815d35bd6399bf0f
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
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, kmem_cache_t * cachep, unsigned long flags)
134 {
135 struct udf_inode_info *ei = (struct udf_inode_info *) foo;
136
137 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
138 SLAB_CTOR_CONSTRUCTOR)
139 {
140 ei->i_ext.i_data = NULL;
141 inode_init_once(&ei->vfs_inode);
142 }
143 }
144
145 static int init_inodecache(void)
146 {
147 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
148 sizeof(struct udf_inode_info),
149 0, (SLAB_RECLAIM_ACCOUNT|
150 SLAB_MEM_SPREAD),
151 init_once, NULL);
152 if (udf_inode_cachep == NULL)
153 return -ENOMEM;
154 return 0;
155 }
156
157 static void destroy_inodecache(void)
158 {
159 if (kmem_cache_destroy(udf_inode_cachep))
160 printk(KERN_INFO "udf_inode_cache: not all structures were freed\n");
161 }
162
163 /* Superblock operations */
164 static struct super_operations udf_sb_ops = {
165 .alloc_inode = udf_alloc_inode,
166 .destroy_inode = udf_destroy_inode,
167 .write_inode = udf_write_inode,
168 .delete_inode = udf_delete_inode,
169 .clear_inode = udf_clear_inode,
170 .put_super = udf_put_super,
171 .write_super = udf_write_super,
172 .statfs = udf_statfs,
173 .remount_fs = udf_remount_fs,
174 };
175
176 struct udf_options
177 {
178 unsigned char novrs;
179 unsigned int blocksize;
180 unsigned int session;
181 unsigned int lastblock;
182 unsigned int anchor;
183 unsigned int volume;
184 unsigned short partition;
185 unsigned int fileset;
186 unsigned int rootdir;
187 unsigned int flags;
188 mode_t umask;
189 gid_t gid;
190 uid_t uid;
191 struct nls_table *nls_map;
192 };
193
194 static int __init init_udf_fs(void)
195 {
196 int err;
197 err = init_inodecache();
198 if (err)
199 goto out1;
200 err = register_filesystem(&udf_fstype);
201 if (err)
202 goto out;
203 return 0;
204 out:
205 destroy_inodecache();
206 out1:
207 return err;
208 }
209
210 static void __exit exit_udf_fs(void)
211 {
212 unregister_filesystem(&udf_fstype);
213 destroy_inodecache();
214 }
215
216 module_init(init_udf_fs)
217 module_exit(exit_udf_fs)
218
219 /*
220 * udf_parse_options
221 *
222 * PURPOSE
223 * Parse mount options.
224 *
225 * DESCRIPTION
226 * The following mount options are supported:
227 *
228 * gid= Set the default group.
229 * umask= Set the default umask.
230 * uid= Set the default user.
231 * bs= Set the block size.
232 * unhide Show otherwise hidden files.
233 * undelete Show deleted files in lists.
234 * adinicb Embed data in the inode (default)
235 * noadinicb Don't embed data in the inode
236 * shortad Use short ad's
237 * longad Use long ad's (default)
238 * nostrict Unset strict conformance
239 * iocharset= Set the NLS character set
240 *
241 * The remaining are for debugging and disaster recovery:
242 *
243 * novrs Skip volume sequence recognition
244 *
245 * The following expect a offset from 0.
246 *
247 * session= Set the CDROM session (default= last session)
248 * anchor= Override standard anchor location. (default= 256)
249 * volume= Override the VolumeDesc location. (unused)
250 * partition= Override the PartitionDesc location. (unused)
251 * lastblock= Set the last block of the filesystem/
252 *
253 * The following expect a offset from the partition root.
254 *
255 * fileset= Override the fileset block location. (unused)
256 * rootdir= Override the root directory location. (unused)
257 * WARNING: overriding the rootdir to a non-directory may
258 * yield highly unpredictable results.
259 *
260 * PRE-CONDITIONS
261 * options Pointer to mount options string.
262 * uopts Pointer to mount options variable.
263 *
264 * POST-CONDITIONS
265 * <return> 1 Mount options parsed okay.
266 * <return> 0 Error parsing mount options.
267 *
268 * HISTORY
269 * July 1, 1997 - Andrew E. Mileski
270 * Written, tested, and released.
271 */
272
273 enum {
274 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
275 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
276 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
277 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
278 Opt_rootdir, Opt_utf8, Opt_iocharset,
279 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
280 };
281
282 static match_table_t tokens = {
283 {Opt_novrs, "novrs"},
284 {Opt_nostrict, "nostrict"},
285 {Opt_bs, "bs=%u"},
286 {Opt_unhide, "unhide"},
287 {Opt_undelete, "undelete"},
288 {Opt_noadinicb, "noadinicb"},
289 {Opt_adinicb, "adinicb"},
290 {Opt_shortad, "shortad"},
291 {Opt_longad, "longad"},
292 {Opt_uforget, "uid=forget"},
293 {Opt_uignore, "uid=ignore"},
294 {Opt_gforget, "gid=forget"},
295 {Opt_gignore, "gid=ignore"},
296 {Opt_gid, "gid=%u"},
297 {Opt_uid, "uid=%u"},
298 {Opt_umask, "umask=%o"},
299 {Opt_session, "session=%u"},
300 {Opt_lastblock, "lastblock=%u"},
301 {Opt_anchor, "anchor=%u"},
302 {Opt_volume, "volume=%u"},
303 {Opt_partition, "partition=%u"},
304 {Opt_fileset, "fileset=%u"},
305 {Opt_rootdir, "rootdir=%u"},
306 {Opt_utf8, "utf8"},
307 {Opt_iocharset, "iocharset=%s"},
308 {Opt_err, NULL}
309 };
310
311 static int
312 udf_parse_options(char *options, struct udf_options *uopt)
313 {
314 char *p;
315 int option;
316
317 uopt->novrs = 0;
318 uopt->blocksize = 2048;
319 uopt->partition = 0xFFFF;
320 uopt->session = 0xFFFFFFFF;
321 uopt->lastblock = 0;
322 uopt->anchor = 0;
323 uopt->volume = 0xFFFFFFFF;
324 uopt->rootdir = 0xFFFFFFFF;
325 uopt->fileset = 0xFFFFFFFF;
326 uopt->nls_map = NULL;
327
328 if (!options)
329 return 1;
330
331 while ((p = strsep(&options, ",")) != NULL)
332 {
333 substring_t args[MAX_OPT_ARGS];
334 int token;
335 if (!*p)
336 continue;
337
338 token = match_token(p, tokens, args);
339 switch (token)
340 {
341 case Opt_novrs:
342 uopt->novrs = 1;
343 case Opt_bs:
344 if (match_int(&args[0], &option))
345 return 0;
346 uopt->blocksize = option;
347 break;
348 case Opt_unhide:
349 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
350 break;
351 case Opt_undelete:
352 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
353 break;
354 case Opt_noadinicb:
355 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
356 break;
357 case Opt_adinicb:
358 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
359 break;
360 case Opt_shortad:
361 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
362 break;
363 case Opt_longad:
364 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
365 break;
366 case Opt_gid:
367 if (match_int(args, &option))
368 return 0;
369 uopt->gid = option;
370 break;
371 case Opt_uid:
372 if (match_int(args, &option))
373 return 0;
374 uopt->uid = option;
375 break;
376 case Opt_umask:
377 if (match_octal(args, &option))
378 return 0;
379 uopt->umask = option;
380 break;
381 case Opt_nostrict:
382 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
383 break;
384 case Opt_session:
385 if (match_int(args, &option))
386 return 0;
387 uopt->session = option;
388 break;
389 case Opt_lastblock:
390 if (match_int(args, &option))
391 return 0;
392 uopt->lastblock = option;
393 break;
394 case Opt_anchor:
395 if (match_int(args, &option))
396 return 0;
397 uopt->anchor = option;
398 break;
399 case Opt_volume:
400 if (match_int(args, &option))
401 return 0;
402 uopt->volume = option;
403 break;
404 case Opt_partition:
405 if (match_int(args, &option))
406 return 0;
407 uopt->partition = option;
408 break;
409 case Opt_fileset:
410 if (match_int(args, &option))
411 return 0;
412 uopt->fileset = option;
413 break;
414 case Opt_rootdir:
415 if (match_int(args, &option))
416 return 0;
417 uopt->rootdir = option;
418 break;
419 case Opt_utf8:
420 uopt->flags |= (1 << UDF_FLAG_UTF8);
421 break;
422 #ifdef CONFIG_UDF_NLS
423 case Opt_iocharset:
424 uopt->nls_map = load_nls(args[0].from);
425 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
426 break;
427 #endif
428 case Opt_uignore:
429 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
430 break;
431 case Opt_uforget:
432 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
433 break;
434 case Opt_gignore:
435 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
436 break;
437 case Opt_gforget:
438 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
439 break;
440 default:
441 printk(KERN_ERR "udf: bad mount option \"%s\" "
442 "or missing value\n", p);
443 return 0;
444 }
445 }
446 return 1;
447 }
448
449 void
450 udf_write_super(struct super_block *sb)
451 {
452 lock_kernel();
453 if (!(sb->s_flags & MS_RDONLY))
454 udf_open_lvid(sb);
455 sb->s_dirt = 0;
456 unlock_kernel();
457 }
458
459 static int
460 udf_remount_fs(struct super_block *sb, int *flags, char *options)
461 {
462 struct udf_options uopt;
463
464 uopt.flags = UDF_SB(sb)->s_flags ;
465 uopt.uid = UDF_SB(sb)->s_uid ;
466 uopt.gid = UDF_SB(sb)->s_gid ;
467 uopt.umask = UDF_SB(sb)->s_umask ;
468
469 if ( !udf_parse_options(options, &uopt) )
470 return -EINVAL;
471
472 UDF_SB(sb)->s_flags = uopt.flags;
473 UDF_SB(sb)->s_uid = uopt.uid;
474 UDF_SB(sb)->s_gid = uopt.gid;
475 UDF_SB(sb)->s_umask = uopt.umask;
476
477 if (UDF_SB_LVIDBH(sb)) {
478 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
479 if (write_rev > UDF_MAX_WRITE_VERSION)
480 *flags |= MS_RDONLY;
481 }
482
483 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
484 return 0;
485 if (*flags & MS_RDONLY)
486 udf_close_lvid(sb);
487 else
488 udf_open_lvid(sb);
489
490 return 0;
491 }
492
493 /*
494 * udf_set_blocksize
495 *
496 * PURPOSE
497 * Set the block size to be used in all transfers.
498 *
499 * DESCRIPTION
500 * To allow room for a DMA transfer, it is best to guess big when unsure.
501 * This routine picks 2048 bytes as the blocksize when guessing. This
502 * should be adequate until devices with larger block sizes become common.
503 *
504 * Note that the Linux kernel can currently only deal with blocksizes of
505 * 512, 1024, 2048, 4096, and 8192 bytes.
506 *
507 * PRE-CONDITIONS
508 * sb Pointer to _locked_ superblock.
509 *
510 * POST-CONDITIONS
511 * sb->s_blocksize Blocksize.
512 * sb->s_blocksize_bits log2 of blocksize.
513 * <return> 0 Blocksize is valid.
514 * <return> 1 Blocksize is invalid.
515 *
516 * HISTORY
517 * July 1, 1997 - Andrew E. Mileski
518 * Written, tested, and released.
519 */
520 static int
521 udf_set_blocksize(struct super_block *sb, int bsize)
522 {
523 if (!sb_min_blocksize(sb, bsize)) {
524 udf_debug("Bad block size (%d)\n", bsize);
525 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
526 return 0;
527 }
528 return sb->s_blocksize;
529 }
530
531 static int
532 udf_vrs(struct super_block *sb, int silent)
533 {
534 struct volStructDesc *vsd = NULL;
535 int sector = 32768;
536 int sectorsize;
537 struct buffer_head *bh = NULL;
538 int iso9660=0;
539 int nsr02=0;
540 int nsr03=0;
541
542 /* Block size must be a multiple of 512 */
543 if (sb->s_blocksize & 511)
544 return 0;
545
546 if (sb->s_blocksize < sizeof(struct volStructDesc))
547 sectorsize = sizeof(struct volStructDesc);
548 else
549 sectorsize = sb->s_blocksize;
550
551 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
552
553 udf_debug("Starting at sector %u (%ld byte sectors)\n",
554 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
555 /* Process the sequence (if applicable) */
556 for (;!nsr02 && !nsr03; sector += sectorsize)
557 {
558 /* Read a block */
559 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
560 if (!bh)
561 break;
562
563 /* Look for ISO descriptors */
564 vsd = (struct volStructDesc *)(bh->b_data +
565 (sector & (sb->s_blocksize - 1)));
566
567 if (vsd->stdIdent[0] == 0)
568 {
569 udf_release_data(bh);
570 break;
571 }
572 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
573 {
574 iso9660 = sector;
575 switch (vsd->structType)
576 {
577 case 0:
578 udf_debug("ISO9660 Boot Record found\n");
579 break;
580 case 1:
581 udf_debug("ISO9660 Primary Volume Descriptor found\n");
582 break;
583 case 2:
584 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
585 break;
586 case 3:
587 udf_debug("ISO9660 Volume Partition Descriptor found\n");
588 break;
589 case 255:
590 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
591 break;
592 default:
593 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
594 break;
595 }
596 }
597 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
598 {
599 }
600 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
601 {
602 udf_release_data(bh);
603 break;
604 }
605 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
606 {
607 nsr02 = sector;
608 }
609 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
610 {
611 nsr03 = sector;
612 }
613 udf_release_data(bh);
614 }
615
616 if (nsr03)
617 return nsr03;
618 else if (nsr02)
619 return nsr02;
620 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
621 return -1;
622 else
623 return 0;
624 }
625
626 /*
627 * udf_find_anchor
628 *
629 * PURPOSE
630 * Find an anchor volume descriptor.
631 *
632 * PRE-CONDITIONS
633 * sb Pointer to _locked_ superblock.
634 * lastblock Last block on media.
635 *
636 * POST-CONDITIONS
637 * <return> 1 if not found, 0 if ok
638 *
639 * HISTORY
640 * July 1, 1997 - Andrew E. Mileski
641 * Written, tested, and released.
642 */
643 static void
644 udf_find_anchor(struct super_block *sb)
645 {
646 int lastblock = UDF_SB_LASTBLOCK(sb);
647 struct buffer_head *bh = NULL;
648 uint16_t ident;
649 uint32_t location;
650 int i;
651
652 if (lastblock)
653 {
654 int varlastblock = udf_variable_to_fixed(lastblock);
655 int last[] = { lastblock, lastblock - 2,
656 lastblock - 150, lastblock - 152,
657 varlastblock, varlastblock - 2,
658 varlastblock - 150, varlastblock - 152 };
659
660 lastblock = 0;
661
662 /* Search for an anchor volume descriptor pointer */
663
664 /* according to spec, anchor is in either:
665 * block 256
666 * lastblock-256
667 * lastblock
668 * however, if the disc isn't closed, it could be 512 */
669
670 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
671 if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
672 {
673 ident = location = 0;
674 }
675 else
676 {
677 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
678 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
679 udf_release_data(bh);
680 }
681
682 if (ident == TAG_IDENT_AVDP)
683 {
684 if (location == last[i] - UDF_SB_SESSION(sb))
685 {
686 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
687 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
688 }
689 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
690 {
691 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
692 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
693 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
694 }
695 else
696 udf_debug("Anchor found at block %d, location mismatch %d.\n",
697 last[i], location);
698 }
699 else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
700 {
701 lastblock = last[i];
702 UDF_SB_ANCHOR(sb)[3] = 512;
703 }
704 else
705 {
706 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
707 {
708 ident = location = 0;
709 }
710 else
711 {
712 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
713 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
714 udf_release_data(bh);
715 }
716
717 if (ident == TAG_IDENT_AVDP &&
718 location == last[i] - 256 - UDF_SB_SESSION(sb))
719 {
720 lastblock = last[i];
721 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
722 }
723 else
724 {
725 if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
726 {
727 ident = location = 0;
728 }
729 else
730 {
731 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
732 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
733 udf_release_data(bh);
734 }
735
736 if (ident == TAG_IDENT_AVDP &&
737 location == udf_variable_to_fixed(last[i]) - 256)
738 {
739 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
740 lastblock = udf_variable_to_fixed(last[i]);
741 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
742 }
743 }
744 }
745 }
746 }
747
748 if (!lastblock)
749 {
750 /* We havn't found the lastblock. check 312 */
751 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
752 {
753 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
754 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
755 udf_release_data(bh);
756
757 if (ident == TAG_IDENT_AVDP && location == 256)
758 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
759 }
760 }
761
762 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
763 if (UDF_SB_ANCHOR(sb)[i])
764 {
765 if (!(bh = udf_read_tagged(sb,
766 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
767 {
768 UDF_SB_ANCHOR(sb)[i] = 0;
769 }
770 else
771 {
772 udf_release_data(bh);
773 if ((ident != TAG_IDENT_AVDP) && (i ||
774 (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
775 {
776 UDF_SB_ANCHOR(sb)[i] = 0;
777 }
778 }
779 }
780 }
781
782 UDF_SB_LASTBLOCK(sb) = lastblock;
783 }
784
785 static int
786 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
787 {
788 struct buffer_head *bh = NULL;
789 long lastblock;
790 uint16_t ident;
791
792 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
793 fileset->partitionReferenceNum != 0xFFFF)
794 {
795 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
796
797 if (!bh)
798 return 1;
799 else if (ident != TAG_IDENT_FSD)
800 {
801 udf_release_data(bh);
802 return 1;
803 }
804
805 }
806
807 if (!bh) /* Search backwards through the partitions */
808 {
809 kernel_lb_addr newfileset;
810
811 return 1;
812
813 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
814 (newfileset.partitionReferenceNum != 0xFFFF &&
815 fileset->logicalBlockNum == 0xFFFFFFFF &&
816 fileset->partitionReferenceNum == 0xFFFF);
817 newfileset.partitionReferenceNum--)
818 {
819 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
820 newfileset.logicalBlockNum = 0;
821
822 do
823 {
824 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
825 if (!bh)
826 {
827 newfileset.logicalBlockNum ++;
828 continue;
829 }
830
831 switch (ident)
832 {
833 case TAG_IDENT_SBD:
834 {
835 struct spaceBitmapDesc *sp;
836 sp = (struct spaceBitmapDesc *)bh->b_data;
837 newfileset.logicalBlockNum += 1 +
838 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
839 >> sb->s_blocksize_bits);
840 udf_release_data(bh);
841 break;
842 }
843 case TAG_IDENT_FSD:
844 {
845 *fileset = newfileset;
846 break;
847 }
848 default:
849 {
850 newfileset.logicalBlockNum ++;
851 udf_release_data(bh);
852 bh = NULL;
853 break;
854 }
855 }
856 }
857 while (newfileset.logicalBlockNum < lastblock &&
858 fileset->logicalBlockNum == 0xFFFFFFFF &&
859 fileset->partitionReferenceNum == 0xFFFF);
860 }
861 }
862
863 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
864 fileset->partitionReferenceNum != 0xFFFF) && bh)
865 {
866 udf_debug("Fileset at block=%d, partition=%d\n",
867 fileset->logicalBlockNum, fileset->partitionReferenceNum);
868
869 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
870 udf_load_fileset(sb, bh, root);
871 udf_release_data(bh);
872 return 0;
873 }
874 return 1;
875 }
876
877 static void
878 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
879 {
880 struct primaryVolDesc *pvoldesc;
881 time_t recording;
882 long recording_usec;
883 struct ustr instr;
884 struct ustr outstr;
885
886 pvoldesc = (struct primaryVolDesc *)bh->b_data;
887
888 if ( udf_stamp_to_time(&recording, &recording_usec,
889 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
890 {
891 kernel_timestamp ts;
892 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
893 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
894 recording, recording_usec,
895 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
896 UDF_SB_RECORDTIME(sb).tv_sec = recording;
897 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
898 }
899
900 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
901 {
902 if (udf_CS0toUTF8(&outstr, &instr))
903 {
904 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
905 outstr.u_len > 31 ? 31 : outstr.u_len);
906 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
907 }
908 }
909
910 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
911 {
912 if (udf_CS0toUTF8(&outstr, &instr))
913 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
914 }
915 }
916
917 static void
918 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
919 {
920 struct fileSetDesc *fset;
921
922 fset = (struct fileSetDesc *)bh->b_data;
923
924 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
925
926 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
927
928 udf_debug("Rootdir at block=%d, partition=%d\n",
929 root->logicalBlockNum, root->partitionReferenceNum);
930 }
931
932 static void
933 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
934 {
935 struct partitionDesc *p;
936 int i;
937
938 p = (struct partitionDesc *)bh->b_data;
939
940 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
941 {
942 udf_debug("Searching map: (%d == %d)\n",
943 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
944 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
945 {
946 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
947 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
948 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
949 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
950 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
951 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
952 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
953 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
954 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
955 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
956
957 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
958 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
959 {
960 struct partitionHeaderDesc *phd;
961
962 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
963 if (phd->unallocSpaceTable.extLength)
964 {
965 kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
966
967 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
968 udf_iget(sb, loc);
969 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
970 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
971 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
972 }
973 if (phd->unallocSpaceBitmap.extLength)
974 {
975 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
976 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
977 {
978 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
979 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
980 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
981 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
982 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
983 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
984 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
985 }
986 }
987 if (phd->partitionIntegrityTable.extLength)
988 udf_debug("partitionIntegrityTable (part %d)\n", i);
989 if (phd->freedSpaceTable.extLength)
990 {
991 kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
992
993 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
994 udf_iget(sb, loc);
995 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
996 udf_debug("freedSpaceTable (part %d) @ %ld\n",
997 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
998 }
999 if (phd->freedSpaceBitmap.extLength)
1000 {
1001 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
1002 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
1003 {
1004 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1005 le32_to_cpu(phd->freedSpaceBitmap.extLength);
1006 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1007 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1008 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1009 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1010 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1011 }
1012 }
1013 }
1014 break;
1015 }
1016 }
1017 if (i == UDF_SB_NUMPARTS(sb))
1018 {
1019 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1020 }
1021 else
1022 {
1023 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1024 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1025 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1026 }
1027 }
1028
1029 static int
1030 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1031 {
1032 struct logicalVolDesc *lvd;
1033 int i, j, offset;
1034 uint8_t type;
1035
1036 lvd = (struct logicalVolDesc *)bh->b_data;
1037
1038 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1039
1040 for (i=0,offset=0;
1041 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1042 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1043 {
1044 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1045 if (type == 1)
1046 {
1047 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1048 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1049 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1050 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1051 UDF_SB_PARTFUNC(sb,i) = NULL;
1052 }
1053 else if (type == 2)
1054 {
1055 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1056 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1057 {
1058 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1059 {
1060 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1061 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1062 }
1063 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1064 {
1065 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1066 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1067 }
1068 }
1069 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1070 {
1071 uint32_t loc;
1072 uint16_t ident;
1073 struct sparingTable *st;
1074 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1075
1076 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1077 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1078 for (j=0; j<spm->numSparingTables; j++)
1079 {
1080 loc = le32_to_cpu(spm->locSparingTable[j]);
1081 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1082 udf_read_tagged(sb, loc, loc, &ident);
1083 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1084 {
1085 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1086 if (ident != 0 ||
1087 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1088 {
1089 udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1090 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1091 }
1092 }
1093 }
1094 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1095 }
1096 else
1097 {
1098 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1099 continue;
1100 }
1101 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1102 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1103 }
1104 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1105 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1106 }
1107
1108 if (fileset)
1109 {
1110 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1111
1112 *fileset = lelb_to_cpu(la->extLocation);
1113 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1114 fileset->logicalBlockNum,
1115 fileset->partitionReferenceNum);
1116 }
1117 if (lvd->integritySeqExt.extLength)
1118 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1119 return 0;
1120 }
1121
1122 /*
1123 * udf_load_logicalvolint
1124 *
1125 */
1126 static void
1127 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1128 {
1129 struct buffer_head *bh = NULL;
1130 uint16_t ident;
1131
1132 while (loc.extLength > 0 &&
1133 (bh = udf_read_tagged(sb, loc.extLocation,
1134 loc.extLocation, &ident)) &&
1135 ident == TAG_IDENT_LVID)
1136 {
1137 UDF_SB_LVIDBH(sb) = bh;
1138
1139 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1140 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1141
1142 if (UDF_SB_LVIDBH(sb) != bh)
1143 udf_release_data(bh);
1144 loc.extLength -= sb->s_blocksize;
1145 loc.extLocation ++;
1146 }
1147 if (UDF_SB_LVIDBH(sb) != bh)
1148 udf_release_data(bh);
1149 }
1150
1151 /*
1152 * udf_process_sequence
1153 *
1154 * PURPOSE
1155 * Process a main/reserve volume descriptor sequence.
1156 *
1157 * PRE-CONDITIONS
1158 * sb Pointer to _locked_ superblock.
1159 * block First block of first extent of the sequence.
1160 * lastblock Lastblock of first extent of the sequence.
1161 *
1162 * HISTORY
1163 * July 1, 1997 - Andrew E. Mileski
1164 * Written, tested, and released.
1165 */
1166 static int
1167 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1168 {
1169 struct buffer_head *bh = NULL;
1170 struct udf_vds_record vds[VDS_POS_LENGTH];
1171 struct generic_desc *gd;
1172 struct volDescPtr *vdp;
1173 int done=0;
1174 int i,j;
1175 uint32_t vdsn;
1176 uint16_t ident;
1177 long next_s = 0, next_e = 0;
1178
1179 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1180
1181 /* Read the main descriptor sequence */
1182 for (;(!done && block <= lastblock); block++)
1183 {
1184
1185 bh = udf_read_tagged(sb, block, block, &ident);
1186 if (!bh)
1187 break;
1188
1189 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1190 gd = (struct generic_desc *)bh->b_data;
1191 vdsn = le32_to_cpu(gd->volDescSeqNum);
1192 switch (ident)
1193 {
1194 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1195 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1196 {
1197 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1198 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1199 }
1200 break;
1201 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1202 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1203 {
1204 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1205 vds[VDS_POS_VOL_DESC_PTR].block = block;
1206
1207 vdp = (struct volDescPtr *)bh->b_data;
1208 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1209 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1210 next_e = next_e >> sb->s_blocksize_bits;
1211 next_e += next_s;
1212 }
1213 break;
1214 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1215 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1216 {
1217 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1218 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1219 }
1220 break;
1221 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1222 if (!vds[VDS_POS_PARTITION_DESC].block)
1223 vds[VDS_POS_PARTITION_DESC].block = block;
1224 break;
1225 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1226 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1227 {
1228 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1229 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1230 }
1231 break;
1232 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1233 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1234 {
1235 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1236 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1237 }
1238 break;
1239 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1240 vds[VDS_POS_TERMINATING_DESC].block = block;
1241 if (next_e)
1242 {
1243 block = next_s;
1244 lastblock = next_e;
1245 next_s = next_e = 0;
1246 }
1247 else
1248 done = 1;
1249 break;
1250 }
1251 udf_release_data(bh);
1252 }
1253 for (i=0; i<VDS_POS_LENGTH; i++)
1254 {
1255 if (vds[i].block)
1256 {
1257 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1258
1259 if (i == VDS_POS_PRIMARY_VOL_DESC)
1260 udf_load_pvoldesc(sb, bh);
1261 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1262 udf_load_logicalvol(sb, bh, fileset);
1263 else if (i == VDS_POS_PARTITION_DESC)
1264 {
1265 struct buffer_head *bh2 = NULL;
1266 udf_load_partdesc(sb, bh);
1267 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1268 {
1269 bh2 = udf_read_tagged(sb, j, j, &ident);
1270 gd = (struct generic_desc *)bh2->b_data;
1271 if (ident == TAG_IDENT_PD)
1272 udf_load_partdesc(sb, bh2);
1273 udf_release_data(bh2);
1274 }
1275 }
1276 udf_release_data(bh);
1277 }
1278 }
1279
1280 return 0;
1281 }
1282
1283 /*
1284 * udf_check_valid()
1285 */
1286 static int
1287 udf_check_valid(struct super_block *sb, int novrs, int silent)
1288 {
1289 long block;
1290
1291 if (novrs)
1292 {
1293 udf_debug("Validity check skipped because of novrs option\n");
1294 return 0;
1295 }
1296 /* Check that it is NSR02 compliant */
1297 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1298 else if ((block = udf_vrs(sb, silent)) == -1)
1299 {
1300 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1301 if (!UDF_SB_LASTBLOCK(sb))
1302 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1303 return 0;
1304 }
1305 else
1306 return !block;
1307 }
1308
1309 static int
1310 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1311 {
1312 struct anchorVolDescPtr *anchor;
1313 uint16_t ident;
1314 struct buffer_head *bh;
1315 long main_s, main_e, reserve_s, reserve_e;
1316 int i, j;
1317
1318 if (!sb)
1319 return 1;
1320
1321 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1322 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1323 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1324 {
1325 anchor = (struct anchorVolDescPtr *)bh->b_data;
1326
1327 /* Locate the main sequence */
1328 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1329 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1330 main_e = main_e >> sb->s_blocksize_bits;
1331 main_e += main_s;
1332
1333 /* Locate the reserve sequence */
1334 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1335 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1336 reserve_e = reserve_e >> sb->s_blocksize_bits;
1337 reserve_e += reserve_s;
1338
1339 udf_release_data(bh);
1340
1341 /* Process the main & reserve sequences */
1342 /* responsible for finding the PartitionDesc(s) */
1343 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1344 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1345 {
1346 break;
1347 }
1348 }
1349 }
1350
1351 if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1352 udf_debug("No Anchor block found\n");
1353 return 1;
1354 } else
1355 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1356
1357 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1358 {
1359 switch UDF_SB_PARTTYPE(sb, i)
1360 {
1361 case UDF_VIRTUAL_MAP15:
1362 case UDF_VIRTUAL_MAP20:
1363 {
1364 kernel_lb_addr ino;
1365
1366 if (!UDF_SB_LASTBLOCK(sb))
1367 {
1368 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1369 udf_find_anchor(sb);
1370 }
1371
1372 if (!UDF_SB_LASTBLOCK(sb))
1373 {
1374 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1375 return 1;
1376 }
1377
1378 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1379 {
1380 if (j != i &&
1381 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1382 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1383 {
1384 ino.partitionReferenceNum = j;
1385 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1386 UDF_SB_PARTROOT(sb,j);
1387 break;
1388 }
1389 }
1390
1391 if (j == UDF_SB_NUMPARTS(sb))
1392 return 1;
1393
1394 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1395 return 1;
1396
1397 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1398 {
1399 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1400 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1401 }
1402 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1403 {
1404 struct buffer_head *bh = NULL;
1405 uint32_t pos;
1406
1407 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1408 bh = sb_bread(sb, pos);
1409 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1410 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1411 udf_ext0_offset(UDF_SB_VAT(sb));
1412 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1413 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1414 udf_release_data(bh);
1415 }
1416 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1417 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1418 }
1419 }
1420 }
1421 return 0;
1422 }
1423
1424 static void udf_open_lvid(struct super_block *sb)
1425 {
1426 if (UDF_SB_LVIDBH(sb))
1427 {
1428 int i;
1429 kernel_timestamp cpu_time;
1430
1431 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1432 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1433 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1434 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1435 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1436
1437 UDF_SB_LVID(sb)->descTag.descCRC =
1438 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1439 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1440
1441 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1442 for (i=0; i<16; i++)
1443 if (i != 4)
1444 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1445 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1446
1447 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1448 }
1449 }
1450
1451 static void udf_close_lvid(struct super_block *sb)
1452 {
1453 if (UDF_SB_LVIDBH(sb) &&
1454 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1455 {
1456 int i;
1457 kernel_timestamp cpu_time;
1458
1459 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1460 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1461 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1462 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1463 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1464 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1465 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1466 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1467 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1468 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1469 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1470
1471 UDF_SB_LVID(sb)->descTag.descCRC =
1472 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1473 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1474
1475 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1476 for (i=0; i<16; i++)
1477 if (i != 4)
1478 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1479 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1480
1481 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1482 }
1483 }
1484
1485 /*
1486 * udf_read_super
1487 *
1488 * PURPOSE
1489 * Complete the specified super block.
1490 *
1491 * PRE-CONDITIONS
1492 * sb Pointer to superblock to complete - never NULL.
1493 * sb->s_dev Device to read suberblock from.
1494 * options Pointer to mount options.
1495 * silent Silent flag.
1496 *
1497 * HISTORY
1498 * July 1, 1997 - Andrew E. Mileski
1499 * Written, tested, and released.
1500 */
1501 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1502 {
1503 int i;
1504 struct inode *inode=NULL;
1505 struct udf_options uopt;
1506 kernel_lb_addr rootdir, fileset;
1507 struct udf_sb_info *sbi;
1508
1509 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1510 uopt.uid = -1;
1511 uopt.gid = -1;
1512 uopt.umask = 0;
1513
1514 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1515 if (!sbi)
1516 return -ENOMEM;
1517 sb->s_fs_info = sbi;
1518 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1519
1520 mutex_init(&sbi->s_alloc_mutex);
1521
1522 if (!udf_parse_options((char *)options, &uopt))
1523 goto error_out;
1524
1525 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1526 uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1527 {
1528 udf_error(sb, "udf_read_super",
1529 "utf8 cannot be combined with iocharset\n");
1530 goto error_out;
1531 }
1532 #ifdef CONFIG_UDF_NLS
1533 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1534 {
1535 uopt.nls_map = load_nls_default();
1536 if (!uopt.nls_map)
1537 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1538 else
1539 udf_debug("Using default NLS map\n");
1540 }
1541 #endif
1542 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1543 uopt.flags |= (1 << UDF_FLAG_UTF8);
1544
1545 fileset.logicalBlockNum = 0xFFFFFFFF;
1546 fileset.partitionReferenceNum = 0xFFFF;
1547
1548 UDF_SB(sb)->s_flags = uopt.flags;
1549 UDF_SB(sb)->s_uid = uopt.uid;
1550 UDF_SB(sb)->s_gid = uopt.gid;
1551 UDF_SB(sb)->s_umask = uopt.umask;
1552 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1553
1554 /* Set the block size for all transfers */
1555 if (!udf_set_blocksize(sb, uopt.blocksize))
1556 goto error_out;
1557
1558 if ( uopt.session == 0xFFFFFFFF )
1559 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1560 else
1561 UDF_SB_SESSION(sb) = uopt.session;
1562
1563 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1564
1565 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1566 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1567 UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1568 UDF_SB_ANCHOR(sb)[3] = 256;
1569
1570 if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1571 {
1572 printk("UDF-fs: No VRS found\n");
1573 goto error_out;
1574 }
1575
1576 udf_find_anchor(sb);
1577
1578 /* Fill in the rest of the superblock */
1579 sb->s_op = &udf_sb_ops;
1580 sb->dq_op = NULL;
1581 sb->s_dirt = 0;
1582 sb->s_magic = UDF_SUPER_MAGIC;
1583 sb->s_time_gran = 1000;
1584
1585 if (udf_load_partition(sb, &fileset))
1586 {
1587 printk("UDF-fs: No partition found (1)\n");
1588 goto error_out;
1589 }
1590
1591 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1592
1593 if ( UDF_SB_LVIDBH(sb) )
1594 {
1595 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1596 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1597 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1598
1599 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1600 {
1601 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1602 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1603 UDF_MAX_READ_VERSION);
1604 goto error_out;
1605 }
1606 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1607 {
1608 sb->s_flags |= MS_RDONLY;
1609 }
1610
1611 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1612
1613 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1614 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1615 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1616 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1617 }
1618
1619 if ( !UDF_SB_NUMPARTS(sb) )
1620 {
1621 printk("UDF-fs: No partition found (2)\n");
1622 goto error_out;
1623 }
1624
1625 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1626 {
1627 printk("UDF-fs: No fileset found\n");
1628 goto error_out;
1629 }
1630
1631 if (!silent)
1632 {
1633 kernel_timestamp ts;
1634 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1635 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1636 UDFFS_VERSION, UDFFS_DATE,
1637 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1638 ts.typeAndTimezone);
1639 }
1640 if (!(sb->s_flags & MS_RDONLY))
1641 udf_open_lvid(sb);
1642
1643 /* Assign the root inode */
1644 /* assign inodes by physical block number */
1645 /* perhaps it's not extensible enough, but for now ... */
1646 inode = udf_iget(sb, rootdir);
1647 if (!inode)
1648 {
1649 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1650 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1651 goto error_out;
1652 }
1653
1654 /* Allocate a dentry for the root inode */
1655 sb->s_root = d_alloc_root(inode);
1656 if (!sb->s_root)
1657 {
1658 printk("UDF-fs: Couldn't allocate root dentry\n");
1659 iput(inode);
1660 goto error_out;
1661 }
1662 sb->s_maxbytes = 1<<30;
1663 return 0;
1664
1665 error_out:
1666 if (UDF_SB_VAT(sb))
1667 iput(UDF_SB_VAT(sb));
1668 if (UDF_SB_NUMPARTS(sb))
1669 {
1670 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1671 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1672 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1673 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1674 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1675 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1676 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1677 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1678 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1679 {
1680 for (i=0; i<4; i++)
1681 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1682 }
1683 }
1684 #ifdef CONFIG_UDF_NLS
1685 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1686 unload_nls(UDF_SB(sb)->s_nls_map);
1687 #endif
1688 if (!(sb->s_flags & MS_RDONLY))
1689 udf_close_lvid(sb);
1690 udf_release_data(UDF_SB_LVIDBH(sb));
1691 UDF_SB_FREE(sb);
1692 kfree(sbi);
1693 sb->s_fs_info = NULL;
1694 return -EINVAL;
1695 }
1696
1697 void udf_error(struct super_block *sb, const char *function,
1698 const char *fmt, ...)
1699 {
1700 va_list args;
1701
1702 if (!(sb->s_flags & MS_RDONLY))
1703 {
1704 /* mark sb error */
1705 sb->s_dirt = 1;
1706 }
1707 va_start(args, fmt);
1708 vsprintf(error_buf, fmt, args);
1709 va_end(args);
1710 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1711 sb->s_id, function, error_buf);
1712 }
1713
1714 void udf_warning(struct super_block *sb, const char *function,
1715 const char *fmt, ...)
1716 {
1717 va_list args;
1718
1719 va_start (args, fmt);
1720 vsprintf(error_buf, fmt, args);
1721 va_end(args);
1722 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1723 sb->s_id, function, error_buf);
1724 }
1725
1726 /*
1727 * udf_put_super
1728 *
1729 * PURPOSE
1730 * Prepare for destruction of the superblock.
1731 *
1732 * DESCRIPTION
1733 * Called before the filesystem is unmounted.
1734 *
1735 * HISTORY
1736 * July 1, 1997 - Andrew E. Mileski
1737 * Written, tested, and released.
1738 */
1739 static void
1740 udf_put_super(struct super_block *sb)
1741 {
1742 int i;
1743
1744 if (UDF_SB_VAT(sb))
1745 iput(UDF_SB_VAT(sb));
1746 if (UDF_SB_NUMPARTS(sb))
1747 {
1748 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1749 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1750 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1751 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1752 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1753 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1754 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1755 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1756 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1757 {
1758 for (i=0; i<4; i++)
1759 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1760 }
1761 }
1762 #ifdef CONFIG_UDF_NLS
1763 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1764 unload_nls(UDF_SB(sb)->s_nls_map);
1765 #endif
1766 if (!(sb->s_flags & MS_RDONLY))
1767 udf_close_lvid(sb);
1768 udf_release_data(UDF_SB_LVIDBH(sb));
1769 UDF_SB_FREE(sb);
1770 kfree(sb->s_fs_info);
1771 sb->s_fs_info = NULL;
1772 }
1773
1774 /*
1775 * udf_stat_fs
1776 *
1777 * PURPOSE
1778 * Return info about the filesystem.
1779 *
1780 * DESCRIPTION
1781 * Called by sys_statfs()
1782 *
1783 * HISTORY
1784 * July 1, 1997 - Andrew E. Mileski
1785 * Written, tested, and released.
1786 */
1787 static int
1788 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1789 {
1790 struct super_block *sb = dentry->d_sb;
1791
1792 buf->f_type = UDF_SUPER_MAGIC;
1793 buf->f_bsize = sb->s_blocksize;
1794 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1795 buf->f_bfree = udf_count_free(sb);
1796 buf->f_bavail = buf->f_bfree;
1797 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1798 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1799 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1800 buf->f_ffree = buf->f_bfree;
1801 /* __kernel_fsid_t f_fsid */
1802 buf->f_namelen = UDF_NAME_LEN-2;
1803
1804 return 0;
1805 }
1806
1807 static unsigned char udf_bitmap_lookup[16] = {
1808 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1809 };
1810
1811 static unsigned int
1812 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1813 {
1814 struct buffer_head *bh = NULL;
1815 unsigned int accum = 0;
1816 int index;
1817 int block = 0, newblock;
1818 kernel_lb_addr loc;
1819 uint32_t bytes;
1820 uint8_t value;
1821 uint8_t *ptr;
1822 uint16_t ident;
1823 struct spaceBitmapDesc *bm;
1824
1825 lock_kernel();
1826
1827 loc.logicalBlockNum = bitmap->s_extPosition;
1828 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1829 bh = udf_read_ptagged(sb, loc, 0, &ident);
1830
1831 if (!bh)
1832 {
1833 printk(KERN_ERR "udf: udf_count_free failed\n");
1834 goto out;
1835 }
1836 else if (ident != TAG_IDENT_SBD)
1837 {
1838 udf_release_data(bh);
1839 printk(KERN_ERR "udf: udf_count_free failed\n");
1840 goto out;
1841 }
1842
1843 bm = (struct spaceBitmapDesc *)bh->b_data;
1844 bytes = le32_to_cpu(bm->numOfBytes);
1845 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1846 ptr = (uint8_t *)bh->b_data;
1847
1848 while ( bytes > 0 )
1849 {
1850 while ((bytes > 0) && (index < sb->s_blocksize))
1851 {
1852 value = ptr[index];
1853 accum += udf_bitmap_lookup[ value & 0x0f ];
1854 accum += udf_bitmap_lookup[ value >> 4 ];
1855 index++;
1856 bytes--;
1857 }
1858 if ( bytes )
1859 {
1860 udf_release_data(bh);
1861 newblock = udf_get_lb_pblock(sb, loc, ++block);
1862 bh = udf_tread(sb, newblock);
1863 if (!bh)
1864 {
1865 udf_debug("read failed\n");
1866 goto out;
1867 }
1868 index = 0;
1869 ptr = (uint8_t *)bh->b_data;
1870 }
1871 }
1872 udf_release_data(bh);
1873
1874 out:
1875 unlock_kernel();
1876
1877 return accum;
1878 }
1879
1880 static unsigned int
1881 udf_count_free_table(struct super_block *sb, struct inode * table)
1882 {
1883 unsigned int accum = 0;
1884 uint32_t extoffset, elen;
1885 kernel_lb_addr bloc, eloc;
1886 int8_t etype;
1887 struct buffer_head *bh = NULL;
1888
1889 lock_kernel();
1890
1891 bloc = UDF_I_LOCATION(table);
1892 extoffset = sizeof(struct unallocSpaceEntry);
1893
1894 while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1895 {
1896 accum += (elen >> table->i_sb->s_blocksize_bits);
1897 }
1898 udf_release_data(bh);
1899
1900 unlock_kernel();
1901
1902 return accum;
1903 }
1904
1905 static unsigned int
1906 udf_count_free(struct super_block *sb)
1907 {
1908 unsigned int accum = 0;
1909
1910 if (UDF_SB_LVIDBH(sb))
1911 {
1912 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1913 {
1914 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1915
1916 if (accum == 0xFFFFFFFF)
1917 accum = 0;
1918 }
1919 }
1920
1921 if (accum)
1922 return accum;
1923
1924 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1925 {
1926 accum += udf_count_free_bitmap(sb,
1927 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1928 }
1929 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1930 {
1931 accum += udf_count_free_bitmap(sb,
1932 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1933 }
1934 if (accum)
1935 return accum;
1936
1937 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1938 {
1939 accum += udf_count_free_table(sb,
1940 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1941 }
1942 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1943 {
1944 accum += udf_count_free_table(sb,
1945 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1946 }
1947
1948 return accum;
1949 }
linux v2.6.22.y-op