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UDF: coding style fixups
[linux-2.6/mini2440.git] / fs / udf / super.c
blob4360c7a05743727a3f7b94753057a5a831eb2b0b
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 *,
84 kernel_lb_addr *);
85 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
86 static void udf_find_anchor(struct super_block *);
87 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
88 kernel_lb_addr *);
89 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
91 kernel_lb_addr *);
92 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
93 static void udf_open_lvid(struct super_block *);
94 static void udf_close_lvid(struct super_block *);
95 static unsigned int udf_count_free(struct super_block *);
96 static int udf_statfs(struct dentry *, struct kstatfs *);
97
98 /* UDF filesystem type */
99 static int udf_get_sb(struct file_system_type *fs_type,
100 int flags, const char *dev_name, void *data,
101 struct vfsmount *mnt)
102 {
103 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
104 }
105
106 static struct file_system_type udf_fstype = {
107 .owner = THIS_MODULE,
108 .name = "udf",
109 .get_sb = udf_get_sb,
110 .kill_sb = kill_block_super,
111 .fs_flags = FS_REQUIRES_DEV,
112 };
113
114 static struct kmem_cache *udf_inode_cachep;
115
116 static struct inode *udf_alloc_inode(struct super_block *sb)
117 {
118 struct udf_inode_info *ei;
119 ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
120 if (!ei)
121 return NULL;
122
123 ei->i_unique = 0;
124 ei->i_lenExtents = 0;
125 ei->i_next_alloc_block = 0;
126 ei->i_next_alloc_goal = 0;
127 ei->i_strat4096 = 0;
128
129 return &ei->vfs_inode;
130 }
131
132 static void udf_destroy_inode(struct inode *inode)
133 {
134 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
135 }
136
137 static void init_once(struct kmem_cache *cachep, void *foo)
138 {
139 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
140
141 ei->i_ext.i_data = NULL;
142 inode_init_once(&ei->vfs_inode);
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);
152 if (!udf_inode_cachep)
153 return -ENOMEM;
154 return 0;
155 }
156
157 static void destroy_inodecache(void)
158 {
159 kmem_cache_destroy(udf_inode_cachep);
160 }
161
162 /* Superblock operations */
163 static const struct super_operations udf_sb_ops = {
164 .alloc_inode = udf_alloc_inode,
165 .destroy_inode = udf_destroy_inode,
166 .write_inode = udf_write_inode,
167 .delete_inode = udf_delete_inode,
168 .clear_inode = udf_clear_inode,
169 .put_super = udf_put_super,
170 .write_super = udf_write_super,
171 .statfs = udf_statfs,
172 .remount_fs = udf_remount_fs,
173 };
174
175 struct udf_options {
176 unsigned char novrs;
177 unsigned int blocksize;
178 unsigned int session;
179 unsigned int lastblock;
180 unsigned int anchor;
181 unsigned int volume;
182 unsigned short partition;
183 unsigned int fileset;
184 unsigned int rootdir;
185 unsigned int flags;
186 mode_t umask;
187 gid_t gid;
188 uid_t uid;
189 struct nls_table *nls_map;
190 };
191
192 static int __init init_udf_fs(void)
193 {
194 int err;
195
196 err = init_inodecache();
197 if (err)
198 goto out1;
199 err = register_filesystem(&udf_fstype);
200 if (err)
201 goto out;
202
203 return 0;
204
205 out:
206 destroy_inodecache();
207
208 out1:
209 return err;
210 }
211
212 static void __exit exit_udf_fs(void)
213 {
214 unregister_filesystem(&udf_fstype);
215 destroy_inodecache();
216 }
217
218 module_init(init_udf_fs)
219 module_exit(exit_udf_fs)
220
221 /*
222 * udf_parse_options
223 *
224 * PURPOSE
225 * Parse mount options.
226 *
227 * DESCRIPTION
228 * The following mount options are supported:
229 *
230 * gid= Set the default group.
231 * umask= Set the default umask.
232 * uid= Set the default user.
233 * bs= Set the block size.
234 * unhide Show otherwise hidden files.
235 * undelete Show deleted files in lists.
236 * adinicb Embed data in the inode (default)
237 * noadinicb Don't embed data in the inode
238 * shortad Use short ad's
239 * longad Use long ad's (default)
240 * nostrict Unset strict conformance
241 * iocharset= Set the NLS character set
242 *
243 * The remaining are for debugging and disaster recovery:
244 *
245 * novrs Skip volume sequence recognition
246 *
247 * The following expect a offset from 0.
248 *
249 * session= Set the CDROM session (default= last session)
250 * anchor= Override standard anchor location. (default= 256)
251 * volume= Override the VolumeDesc location. (unused)
252 * partition= Override the PartitionDesc location. (unused)
253 * lastblock= Set the last block of the filesystem/
254 *
255 * The following expect a offset from the partition root.
256 *
257 * fileset= Override the fileset block location. (unused)
258 * rootdir= Override the root directory location. (unused)
259 * WARNING: overriding the rootdir to a non-directory may
260 * yield highly unpredictable results.
261 *
262 * PRE-CONDITIONS
263 * options Pointer to mount options string.
264 * uopts Pointer to mount options variable.
265 *
266 * POST-CONDITIONS
267 * <return> 1 Mount options parsed okay.
268 * <return> 0 Error parsing mount options.
269 *
270 * HISTORY
271 * July 1, 1997 - Andrew E. Mileski
272 * Written, tested, and released.
273 */
274
275 enum {
276 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
277 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
278 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
279 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
280 Opt_rootdir, Opt_utf8, Opt_iocharset,
281 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
282 };
283
284 static match_table_t tokens = {
285 {Opt_novrs, "novrs"},
286 {Opt_nostrict, "nostrict"},
287 {Opt_bs, "bs=%u"},
288 {Opt_unhide, "unhide"},
289 {Opt_undelete, "undelete"},
290 {Opt_noadinicb, "noadinicb"},
291 {Opt_adinicb, "adinicb"},
292 {Opt_shortad, "shortad"},
293 {Opt_longad, "longad"},
294 {Opt_uforget, "uid=forget"},
295 {Opt_uignore, "uid=ignore"},
296 {Opt_gforget, "gid=forget"},
297 {Opt_gignore, "gid=ignore"},
298 {Opt_gid, "gid=%u"},
299 {Opt_uid, "uid=%u"},
300 {Opt_umask, "umask=%o"},
301 {Opt_session, "session=%u"},
302 {Opt_lastblock, "lastblock=%u"},
303 {Opt_anchor, "anchor=%u"},
304 {Opt_volume, "volume=%u"},
305 {Opt_partition, "partition=%u"},
306 {Opt_fileset, "fileset=%u"},
307 {Opt_rootdir, "rootdir=%u"},
308 {Opt_utf8, "utf8"},
309 {Opt_iocharset, "iocharset=%s"},
310 {Opt_err, NULL}
311 };
312
313 static int udf_parse_options(char *options, struct udf_options *uopt)
314 {
315 char *p;
316 int option;
317
318 uopt->novrs = 0;
319 uopt->blocksize = 2048;
320 uopt->partition = 0xFFFF;
321 uopt->session = 0xFFFFFFFF;
322 uopt->lastblock = 0;
323 uopt->anchor = 0;
324 uopt->volume = 0xFFFFFFFF;
325 uopt->rootdir = 0xFFFFFFFF;
326 uopt->fileset = 0xFFFFFFFF;
327 uopt->nls_map = NULL;
328
329 if (!options)
330 return 1;
331
332 while ((p = strsep(&options, ",")) != NULL) {
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 case Opt_novrs:
341 uopt->novrs = 1;
342 case Opt_bs:
343 if (match_int(&args[0], &option))
344 return 0;
345 uopt->blocksize = option;
346 break;
347 case Opt_unhide:
348 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
349 break;
350 case Opt_undelete:
351 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
352 break;
353 case Opt_noadinicb:
354 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
355 break;
356 case Opt_adinicb:
357 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
358 break;
359 case Opt_shortad:
360 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
361 break;
362 case Opt_longad:
363 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
364 break;
365 case Opt_gid:
366 if (match_int(args, &option))
367 return 0;
368 uopt->gid = option;
369 uopt->flags |= (1 << UDF_FLAG_GID_SET);
370 break;
371 case Opt_uid:
372 if (match_int(args, &option))
373 return 0;
374 uopt->uid = option;
375 uopt->flags |= (1 << UDF_FLAG_UID_SET);
376 break;
377 case Opt_umask:
378 if (match_octal(args, &option))
379 return 0;
380 uopt->umask = option;
381 break;
382 case Opt_nostrict:
383 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
384 break;
385 case Opt_session:
386 if (match_int(args, &option))
387 return 0;
388 uopt->session = option;
389 break;
390 case Opt_lastblock:
391 if (match_int(args, &option))
392 return 0;
393 uopt->lastblock = option;
394 break;
395 case Opt_anchor:
396 if (match_int(args, &option))
397 return 0;
398 uopt->anchor = option;
399 break;
400 case Opt_volume:
401 if (match_int(args, &option))
402 return 0;
403 uopt->volume = option;
404 break;
405 case Opt_partition:
406 if (match_int(args, &option))
407 return 0;
408 uopt->partition = option;
409 break;
410 case Opt_fileset:
411 if (match_int(args, &option))
412 return 0;
413 uopt->fileset = option;
414 break;
415 case Opt_rootdir:
416 if (match_int(args, &option))
417 return 0;
418 uopt->rootdir = option;
419 break;
420 case Opt_utf8:
421 uopt->flags |= (1 << UDF_FLAG_UTF8);
422 break;
423 #ifdef CONFIG_UDF_NLS
424 case Opt_iocharset:
425 uopt->nls_map = load_nls(args[0].from);
426 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
427 break;
428 #endif
429 case Opt_uignore:
430 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
431 break;
432 case Opt_uforget:
433 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
434 break;
435 case Opt_gignore:
436 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
437 break;
438 case Opt_gforget:
439 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
440 break;
441 default:
442 printk(KERN_ERR "udf: bad mount option \"%s\" "
443 "or missing value\n", p);
444 return 0;
445 }
446 }
447 return 1;
448 }
449
450 void udf_write_super(struct super_block *sb)
451 {
452 lock_kernel();
453
454 if (!(sb->s_flags & MS_RDONLY))
455 udf_open_lvid(sb);
456 sb->s_dirt = 0;
457
458 unlock_kernel();
459 }
460
461 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
462 {
463 struct udf_options uopt;
464
465 uopt.flags = UDF_SB(sb)->s_flags;
466 uopt.uid = UDF_SB(sb)->s_uid;
467 uopt.gid = UDF_SB(sb)->s_gid;
468 uopt.umask = UDF_SB(sb)->s_umask;
469
470 if (!udf_parse_options(options, &uopt))
471 return -EINVAL;
472
473 UDF_SB(sb)->s_flags = uopt.flags;
474 UDF_SB(sb)->s_uid = uopt.uid;
475 UDF_SB(sb)->s_gid = uopt.gid;
476 UDF_SB(sb)->s_umask = uopt.umask;
477
478 if (UDF_SB_LVIDBH(sb)) {
479 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
480 if (write_rev > UDF_MAX_WRITE_VERSION)
481 *flags |= MS_RDONLY;
482 }
483
484 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
485 return 0;
486 if (*flags & MS_RDONLY)
487 udf_close_lvid(sb);
488 else
489 udf_open_lvid(sb);
490
491 return 0;
492 }
493
494 /*
495 * udf_set_blocksize
496 *
497 * PURPOSE
498 * Set the block size to be used in all transfers.
499 *
500 * DESCRIPTION
501 * To allow room for a DMA transfer, it is best to guess big when unsure.
502 * This routine picks 2048 bytes as the blocksize when guessing. This
503 * should be adequate until devices with larger block sizes become common.
504 *
505 * Note that the Linux kernel can currently only deal with blocksizes of
506 * 512, 1024, 2048, 4096, and 8192 bytes.
507 *
508 * PRE-CONDITIONS
509 * sb Pointer to _locked_ superblock.
510 *
511 * POST-CONDITIONS
512 * sb->s_blocksize Blocksize.
513 * sb->s_blocksize_bits log2 of blocksize.
514 * <return> 0 Blocksize is valid.
515 * <return> 1 Blocksize is invalid.
516 *
517 * HISTORY
518 * July 1, 1997 - Andrew E. Mileski
519 * Written, tested, and released.
520 */
521 static int 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
529 return sb->s_blocksize;
530 }
531
532 static int 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 /* Read a block */
558 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
559 if (!bh)
560 break;
561
562 /* Look for ISO descriptors */
563 vsd = (struct volStructDesc *)(bh->b_data +
564 (sector & (sb->s_blocksize - 1)));
565
566 if (vsd->stdIdent[0] == 0) {
567 brelse(bh);
568 break;
569 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
570 iso9660 = sector;
571 switch (vsd->structType) {
572 case 0:
573 udf_debug("ISO9660 Boot Record found\n");
574 break;
575 case 1:
576 udf_debug
577 ("ISO9660 Primary Volume Descriptor found\n");
578 break;
579 case 2:
580 udf_debug
581 ("ISO9660 Supplementary Volume Descriptor found\n");
582 break;
583 case 3:
584 udf_debug
585 ("ISO9660 Volume Partition Descriptor found\n");
586 break;
587 case 255:
588 udf_debug
589 ("ISO9660 Volume Descriptor Set Terminator found\n");
590 break;
591 default:
592 udf_debug("ISO9660 VRS (%u) found\n",
593 vsd->structType);
594 break;
595 }
596 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN)) {
597 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN)) {
598 brelse(bh);
599 break;
600 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN)) {
601 nsr02 = sector;
602 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN)) {
603 nsr03 = sector;
604 }
605 brelse(bh);
606 }
607
608 if (nsr03)
609 return nsr03;
610 else if (nsr02)
611 return nsr02;
612 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
613 return -1;
614 else
615 return 0;
616 }
617
618 /*
619 * udf_find_anchor
620 *
621 * PURPOSE
622 * Find an anchor volume descriptor.
623 *
624 * PRE-CONDITIONS
625 * sb Pointer to _locked_ superblock.
626 * lastblock Last block on media.
627 *
628 * POST-CONDITIONS
629 * <return> 1 if not found, 0 if ok
630 *
631 * HISTORY
632 * July 1, 1997 - Andrew E. Mileski
633 * Written, tested, and released.
634 */
635 static void udf_find_anchor(struct super_block *sb)
636 {
637 int lastblock = UDF_SB_LASTBLOCK(sb);
638 struct buffer_head *bh = NULL;
639 uint16_t ident;
640 uint32_t location;
641 int i;
642
643 if (lastblock) {
644 int varlastblock = udf_variable_to_fixed(lastblock);
645 int last[] = { lastblock, lastblock - 2,
646 lastblock - 150, lastblock - 152,
647 varlastblock, varlastblock - 2,
648 varlastblock - 150, varlastblock - 152 };
649
650 lastblock = 0;
651
652 /* Search for an anchor volume descriptor pointer */
653
654 /* according to spec, anchor is in either:
655 * block 256
656 * lastblock-256
657 * lastblock
658 * however, if the disc isn't closed, it could be 512 */
659
660 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
661 if (last[i] < 0 || !(bh = sb_bread(sb, last[i]))) {
662 ident = location = 0;
663 } else {
664 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
665 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
666 brelse(bh);
667 }
668
669 if (ident == TAG_IDENT_AVDP) {
670 if (location == last[i] - UDF_SB_SESSION(sb)) {
671 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
672 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
673 } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) {
674 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
675 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
676 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
677 } else {
678 udf_debug("Anchor found at block %d, location mismatch %d.\n",
679 last[i], location);
680 }
681 } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
682 lastblock = last[i];
683 UDF_SB_ANCHOR(sb)[3] = 512;
684 } else {
685 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256))) {
686 ident = location = 0;
687 } else {
688 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
689 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
690 brelse(bh);
691 }
692
693 if (ident == TAG_IDENT_AVDP &&
694 location == last[i] - 256 - UDF_SB_SESSION(sb)) {
695 lastblock = last[i];
696 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
697 } else {
698 if (last[i] < 312 + UDF_SB_SESSION(sb) ||
699 !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb)))) {
700 ident = location = 0;
701 } else {
702 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
703 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
704 brelse(bh);
705 }
706
707 if (ident == TAG_IDENT_AVDP &&
708 location == udf_variable_to_fixed(last[i]) - 256) {
709 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
710 lastblock = udf_variable_to_fixed(last[i]);
711 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
712 }
713 }
714 }
715 }
716 }
717
718 if (!lastblock) {
719 /* We havn't found the lastblock. check 312 */
720 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb)))) {
721 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
722 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
723 brelse(bh);
724
725 if (ident == TAG_IDENT_AVDP && location == 256)
726 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
727 }
728 }
729
730 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
731 if (UDF_SB_ANCHOR(sb)[i]) {
732 if (!(bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
733 UDF_SB_ANCHOR(sb)[i], &ident))) {
734 UDF_SB_ANCHOR(sb)[i] = 0;
735 } else {
736 brelse(bh);
737 if ((ident != TAG_IDENT_AVDP) &&
738 (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE))) {
739 UDF_SB_ANCHOR(sb)[i] = 0;
740 }
741 }
742 }
743 }
744
745 UDF_SB_LASTBLOCK(sb) = lastblock;
746 }
747
748 static int udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
749 {
750 struct buffer_head *bh = NULL;
751 long lastblock;
752 uint16_t ident;
753
754 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
755 fileset->partitionReferenceNum != 0xFFFF) {
756 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
757
758 if (!bh) {
759 return 1;
760 } else if (ident != TAG_IDENT_FSD) {
761 brelse(bh);
762 return 1;
763 }
764
765 }
766
767 if (!bh) { /* Search backwards through the partitions */
768 kernel_lb_addr newfileset;
769
770 /* --> cvg: FIXME - is it reasonable? */
771 return 1;
772
773 for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1;
774 (newfileset.partitionReferenceNum != 0xFFFF &&
775 fileset->logicalBlockNum == 0xFFFFFFFF &&
776 fileset->partitionReferenceNum == 0xFFFF);
777 newfileset.partitionReferenceNum--) {
778 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
779 newfileset.logicalBlockNum = 0;
780
781 do {
782 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
783 if (!bh) {
784 newfileset.logicalBlockNum++;
785 continue;
786 }
787
788 switch (ident) {
789 case TAG_IDENT_SBD:
790 {
791 struct spaceBitmapDesc *sp;
792 sp = (struct spaceBitmapDesc *)bh->b_data;
793 newfileset.logicalBlockNum += 1 +
794 ((le32_to_cpu(sp->numOfBytes) +
795 sizeof(struct spaceBitmapDesc) - 1)
796 >> sb->s_blocksize_bits);
797 brelse(bh);
798 break;
799 }
800 case TAG_IDENT_FSD:
801 *fileset = newfileset;
802 break;
803 default:
804 newfileset.logicalBlockNum++;
805 brelse(bh);
806 bh = NULL;
807 break;
808 }
809 } while (newfileset.logicalBlockNum < lastblock &&
810 fileset->logicalBlockNum == 0xFFFFFFFF &&
811 fileset->partitionReferenceNum == 0xFFFF);
812 }
813 }
814
815 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
816 fileset->partitionReferenceNum != 0xFFFF) && bh) {
817 udf_debug("Fileset at block=%d, partition=%d\n",
818 fileset->logicalBlockNum,
819 fileset->partitionReferenceNum);
820
821 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
822 udf_load_fileset(sb, bh, root);
823 brelse(bh);
824 return 0;
825 }
826 return 1;
827 }
828
829 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
830 {
831 struct primaryVolDesc *pvoldesc;
832 time_t recording;
833 long recording_usec;
834 struct ustr instr;
835 struct ustr outstr;
836
837 pvoldesc = (struct primaryVolDesc *)bh->b_data;
838
839 if (udf_stamp_to_time(&recording, &recording_usec,
840 lets_to_cpu(pvoldesc->recordingDateAndTime))) {
841 kernel_timestamp ts;
842 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
843 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
844 recording, recording_usec,
845 ts.year, ts.month, ts.day, ts.hour,
846 ts.minute, ts.typeAndTimezone);
847 UDF_SB_RECORDTIME(sb).tv_sec = recording;
848 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
849 }
850
851 if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
852 if (udf_CS0toUTF8(&outstr, &instr)) {
853 strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name,
854 outstr.u_len > 31 ? 31 : outstr.u_len);
855 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
856 }
857 }
858
859 if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
860 if (udf_CS0toUTF8(&outstr, &instr))
861 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
862 }
863 }
864
865 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
866 kernel_lb_addr *root)
867 {
868 struct fileSetDesc *fset;
869
870 fset = (struct fileSetDesc *)bh->b_data;
871
872 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
873
874 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
875
876 udf_debug("Rootdir at block=%d, partition=%d\n",
877 root->logicalBlockNum, root->partitionReferenceNum);
878 }
879
880 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
881 {
882 struct partitionDesc *p;
883 int i;
884
885 p = (struct partitionDesc *)bh->b_data;
886
887 for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
888 udf_debug("Searching map: (%d == %d)\n",
889 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
890 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) {
891 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
892 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
893 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
894 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
895 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
896 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
897 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
898 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
899 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
900 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
901
902 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
903 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) {
904 struct partitionHeaderDesc *phd;
905
906 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
907 if (phd->unallocSpaceTable.extLength) {
908 kernel_lb_addr loc = {
909 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
910 .partitionReferenceNum = i,
911 };
912
913 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
914 udf_iget(sb, loc);
915 if (!UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table) {
916 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
917 return 1;
918 }
919 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
920 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
921 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
922 }
923 if (phd->unallocSpaceBitmap.extLength) {
924 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
925 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) {
926 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
927 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
928 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
929 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
930 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
931 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
932 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
933 }
934 }
935 if (phd->partitionIntegrityTable.extLength)
936 udf_debug("partitionIntegrityTable (part %d)\n", i);
937 if (phd->freedSpaceTable.extLength) {
938 kernel_lb_addr loc = {
939 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
940 .partitionReferenceNum = i,
941 };
942
943 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
944 udf_iget(sb, loc);
945 if (!UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table) {
946 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
947 return 1;
948 }
949 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
950 udf_debug("freedSpaceTable (part %d) @ %ld\n",
951 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
952 }
953 if (phd->freedSpaceBitmap.extLength) {
954 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
955 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) {
956 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
957 le32_to_cpu(phd->freedSpaceBitmap.extLength);
958 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
959 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
960 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
961 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
962 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
963 }
964 }
965 }
966 break;
967 }
968 }
969 if (i == UDF_SB_NUMPARTS(sb)) {
970 udf_debug("Partition (%d) not found in partition map\n",
971 le16_to_cpu(p->partitionNumber));
972 } else {
973 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
974 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
975 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
976 }
977 return 0;
978 }
979
980 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
981 kernel_lb_addr *fileset)
982 {
983 struct logicalVolDesc *lvd;
984 int i, j, offset;
985 uint8_t type;
986
987 lvd = (struct logicalVolDesc *)bh->b_data;
988
989 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
990
991 for (i = 0, offset = 0;
992 i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength);
993 i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
994 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
995 if (type == 1) {
996 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
997 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
998 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
999 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1000 UDF_SB_PARTFUNC(sb,i) = NULL;
1001 } else if (type == 2) {
1002 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1003 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
1004 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
1005 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1006 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1007 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
1008 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1009 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1010 }
1011 } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1012 uint32_t loc;
1013 uint16_t ident;
1014 struct sparingTable *st;
1015 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1016
1017 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1018 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1019 for (j = 0; j < spm->numSparingTables; j++) {
1020 loc = le32_to_cpu(spm->locSparingTable[j]);
1021 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1022 udf_read_tagged(sb, loc, loc, &ident);
1023 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL) {
1024 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1025 if (ident != 0 ||
1026 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1027 brelse(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1028 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1029 }
1030 }
1031 }
1032 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1033 } else {
1034 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1035 continue;
1036 }
1037 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1038 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1039 }
1040 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1041 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1042 }
1043
1044 if (fileset) {
1045 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1046
1047 *fileset = lelb_to_cpu(la->extLocation);
1048 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1049 fileset->logicalBlockNum,
1050 fileset->partitionReferenceNum);
1051 }
1052 if (lvd->integritySeqExt.extLength)
1053 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1054
1055 return 0;
1056 }
1057
1058 /*
1059 * udf_load_logicalvolint
1060 *
1061 */
1062 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1063 {
1064 struct buffer_head *bh = NULL;
1065 uint16_t ident;
1066
1067 while (loc.extLength > 0 &&
1068 (bh = udf_read_tagged(sb, loc.extLocation,
1069 loc.extLocation, &ident)) &&
1070 ident == TAG_IDENT_LVID) {
1071 UDF_SB_LVIDBH(sb) = bh;
1072
1073 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1074 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1075
1076 if (UDF_SB_LVIDBH(sb) != bh)
1077 brelse(bh);
1078 loc.extLength -= sb->s_blocksize;
1079 loc.extLocation++;
1080 }
1081 if (UDF_SB_LVIDBH(sb) != bh)
1082 brelse(bh);
1083 }
1084
1085 /*
1086 * udf_process_sequence
1087 *
1088 * PURPOSE
1089 * Process a main/reserve volume descriptor sequence.
1090 *
1091 * PRE-CONDITIONS
1092 * sb Pointer to _locked_ superblock.
1093 * block First block of first extent of the sequence.
1094 * lastblock Lastblock of first extent of the sequence.
1095 *
1096 * HISTORY
1097 * July 1, 1997 - Andrew E. Mileski
1098 * Written, tested, and released.
1099 */
1100 static int udf_process_sequence(struct super_block *sb, long block, long lastblock,
1101 kernel_lb_addr *fileset)
1102 {
1103 struct buffer_head *bh = NULL;
1104 struct udf_vds_record vds[VDS_POS_LENGTH];
1105 struct generic_desc *gd;
1106 struct volDescPtr *vdp;
1107 int done = 0;
1108 int i, j;
1109 uint32_t vdsn;
1110 uint16_t ident;
1111 long next_s = 0, next_e = 0;
1112
1113 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1114
1115 /* Read the main descriptor sequence */
1116 for (; (!done && block <= lastblock); block++) {
1117
1118 bh = udf_read_tagged(sb, block, block, &ident);
1119 if (!bh)
1120 break;
1121
1122 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1123 gd = (struct generic_desc *)bh->b_data;
1124 vdsn = le32_to_cpu(gd->volDescSeqNum);
1125 switch (ident) {
1126 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1127 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1128 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1129 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1130 }
1131 break;
1132 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1133 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1134 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1135 vds[VDS_POS_VOL_DESC_PTR].block = block;
1136
1137 vdp = (struct volDescPtr *)bh->b_data;
1138 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1139 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1140 next_e = next_e >> sb->s_blocksize_bits;
1141 next_e += next_s;
1142 }
1143 break;
1144 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1145 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1146 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1147 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1148 }
1149 break;
1150 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1151 if (!vds[VDS_POS_PARTITION_DESC].block)
1152 vds[VDS_POS_PARTITION_DESC].block = block;
1153 break;
1154 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1155 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1156 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1157 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1158 }
1159 break;
1160 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1161 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1162 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1163 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1164 }
1165 break;
1166 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1167 vds[VDS_POS_TERMINATING_DESC].block = block;
1168 if (next_e) {
1169 block = next_s;
1170 lastblock = next_e;
1171 next_s = next_e = 0;
1172 } else {
1173 done = 1;
1174 }
1175 break;
1176 }
1177 brelse(bh);
1178 }
1179 for (i = 0; i < VDS_POS_LENGTH; i++) {
1180 if (vds[i].block) {
1181 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1182
1183 if (i == VDS_POS_PRIMARY_VOL_DESC) {
1184 udf_load_pvoldesc(sb, bh);
1185 } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1186 udf_load_logicalvol(sb, bh, fileset);
1187 } else if (i == VDS_POS_PARTITION_DESC) {
1188 struct buffer_head *bh2 = NULL;
1189 if (udf_load_partdesc(sb, bh)) {
1190 brelse(bh);
1191 return 1;
1192 }
1193 for (j = vds[i].block + 1; j < vds[VDS_POS_TERMINATING_DESC].block; j++) {
1194 bh2 = udf_read_tagged(sb, j, j, &ident);
1195 gd = (struct generic_desc *)bh2->b_data;
1196 if (ident == TAG_IDENT_PD)
1197 if (udf_load_partdesc(sb, bh2)) {
1198 brelse(bh);
1199 brelse(bh2);
1200 return 1;
1201 }
1202 brelse(bh2);
1203 }
1204 }
1205 brelse(bh);
1206 }
1207 }
1208
1209 return 0;
1210 }
1211
1212 /*
1213 * udf_check_valid()
1214 */
1215 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1216 {
1217 long block;
1218
1219 if (novrs) {
1220 udf_debug("Validity check skipped because of novrs option\n");
1221 return 0;
1222 }
1223 /* Check that it is NSR02 compliant */
1224 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1225 else if ((block = udf_vrs(sb, silent)) == -1) {
1226 udf_debug("Failed to read byte 32768. Assuming open disc. "
1227 "Skipping validity check\n");
1228 if (!UDF_SB_LASTBLOCK(sb))
1229 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1230 return 0;
1231 } else {
1232 return !block;
1233 }
1234 }
1235
1236 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1237 {
1238 struct anchorVolDescPtr *anchor;
1239 uint16_t ident;
1240 struct buffer_head *bh;
1241 long main_s, main_e, reserve_s, reserve_e;
1242 int i, j;
1243
1244 if (!sb)
1245 return 1;
1246
1247 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1248 if (UDF_SB_ANCHOR(sb)[i] &&
1249 (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
1250 UDF_SB_ANCHOR(sb)[i], &ident))) {
1251 anchor = (struct anchorVolDescPtr *)bh->b_data;
1252
1253 /* Locate the main sequence */
1254 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1255 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength );
1256 main_e = main_e >> sb->s_blocksize_bits;
1257 main_e += main_s;
1258
1259 /* Locate the reserve sequence */
1260 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1261 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1262 reserve_e = reserve_e >> sb->s_blocksize_bits;
1263 reserve_e += reserve_s;
1264
1265 brelse(bh);
1266
1267 /* Process the main & reserve sequences */
1268 /* responsible for finding the PartitionDesc(s) */
1269 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1270 udf_process_sequence(sb, reserve_s, reserve_e, fileset))) {
1271 break;
1272 }
1273 }
1274 }
1275
1276 if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1277 udf_debug("No Anchor block found\n");
1278 return 1;
1279 } else
1280 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1281
1282 for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
1283 kernel_lb_addr uninitialized_var(ino);
1284 switch (UDF_SB_PARTTYPE(sb, i)) {
1285 case UDF_VIRTUAL_MAP15:
1286 case UDF_VIRTUAL_MAP20:
1287 if (!UDF_SB_LASTBLOCK(sb)) {
1288 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1289 udf_find_anchor(sb);
1290 }
1291
1292 if (!UDF_SB_LASTBLOCK(sb)) {
1293 udf_debug("Unable to determine Lastblock (For "
1294 "Virtual Partition)\n");
1295 return 1;
1296 }
1297
1298 for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) {
1299 if (j != i &&
1300 UDF_SB_PARTVSN(sb, i) == UDF_SB_PARTVSN(sb, j) &&
1301 UDF_SB_PARTNUM(sb, i) == UDF_SB_PARTNUM(sb, j)) {
1302 ino.partitionReferenceNum = j;
1303 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb, j);
1304 break;
1305 }
1306 }
1307
1308 if (j == UDF_SB_NUMPARTS(sb))
1309 return 1;
1310
1311 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1312 return 1;
1313
1314 if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) {
1315 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1316 udf_ext0_offset(UDF_SB_VAT(sb));
1317 UDF_SB_TYPEVIRT(sb, i).s_num_entries =
1318 (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1319 } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) {
1320 struct buffer_head *bh = NULL;
1321 uint32_t pos;
1322
1323 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1324 bh = sb_bread(sb, pos);
1325 if (!bh)
1326 return 1;
1327 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1328 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data +
1329 udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1330 udf_ext0_offset(UDF_SB_VAT(sb));
1331 UDF_SB_TYPEVIRT(sb, i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1332 UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2;
1333 brelse(bh);
1334 }
1335 UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0);
1336 UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb, ino.partitionReferenceNum);
1337 }
1338 }
1339 return 0;
1340 }
1341
1342 static void udf_open_lvid(struct super_block *sb)
1343 {
1344 if (UDF_SB_LVIDBH(sb)) {
1345 int i;
1346 kernel_timestamp cpu_time;
1347
1348 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1349 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1350 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1351 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1352 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1353
1354 UDF_SB_LVID(sb)->descTag.descCRC = cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1355 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1356
1357 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1358 for (i = 0; i < 16; i++)
1359 if (i != 4)
1360 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1361 ((uint8_t *) &(UDF_SB_LVID(sb)->descTag))[i];
1362
1363 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1364 }
1365 }
1366
1367 static void udf_close_lvid(struct super_block *sb)
1368 {
1369 kernel_timestamp cpu_time;
1370 int i;
1371
1372 if (UDF_SB_LVIDBH(sb) &&
1373 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1374 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1375 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1376 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1377 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1378 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1379 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1380 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1381 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1382 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1383 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1384 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1385
1386 UDF_SB_LVID(sb)->descTag.descCRC =
1387 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1388 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1389
1390 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1391 for (i = 0; i < 16; i++)
1392 if (i != 4)
1393 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1394 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1395
1396 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1397 }
1398 }
1399
1400 /*
1401 * udf_read_super
1402 *
1403 * PURPOSE
1404 * Complete the specified super block.
1405 *
1406 * PRE-CONDITIONS
1407 * sb Pointer to superblock to complete - never NULL.
1408 * sb->s_dev Device to read suberblock from.
1409 * options Pointer to mount options.
1410 * silent Silent flag.
1411 *
1412 * HISTORY
1413 * July 1, 1997 - Andrew E. Mileski
1414 * Written, tested, and released.
1415 */
1416 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1417 {
1418 int i;
1419 struct inode *inode = NULL;
1420 struct udf_options uopt;
1421 kernel_lb_addr rootdir, fileset;
1422 struct udf_sb_info *sbi;
1423
1424 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1425 uopt.uid = -1;
1426 uopt.gid = -1;
1427 uopt.umask = 0;
1428
1429 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1430 if (!sbi)
1431 return -ENOMEM;
1432
1433 sb->s_fs_info = sbi;
1434 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1435
1436 mutex_init(&sbi->s_alloc_mutex);
1437
1438 if (!udf_parse_options((char *)options, &uopt))
1439 goto error_out;
1440
1441 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1442 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1443 udf_error(sb, "udf_read_super",
1444 "utf8 cannot be combined with iocharset\n");
1445 goto error_out;
1446 }
1447 #ifdef CONFIG_UDF_NLS
1448 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1449 uopt.nls_map = load_nls_default();
1450 if (!uopt.nls_map)
1451 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1452 else
1453 udf_debug("Using default NLS map\n");
1454 }
1455 #endif
1456 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1457 uopt.flags |= (1 << UDF_FLAG_UTF8);
1458
1459 fileset.logicalBlockNum = 0xFFFFFFFF;
1460 fileset.partitionReferenceNum = 0xFFFF;
1461
1462 UDF_SB(sb)->s_flags = uopt.flags;
1463 UDF_SB(sb)->s_uid = uopt.uid;
1464 UDF_SB(sb)->s_gid = uopt.gid;
1465 UDF_SB(sb)->s_umask = uopt.umask;
1466 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1467
1468 /* Set the block size for all transfers */
1469 if (!udf_set_blocksize(sb, uopt.blocksize))
1470 goto error_out;
1471
1472 if (uopt.session == 0xFFFFFFFF)
1473 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1474 else
1475 UDF_SB_SESSION(sb) = uopt.session;
1476
1477 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1478
1479 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1480 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1481 UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1482 UDF_SB_ANCHOR(sb)[3] = 256;
1483
1484 if (udf_check_valid(sb, uopt.novrs, silent)) { /* read volume recognition sequences */
1485 printk("UDF-fs: No VRS found\n");
1486 goto error_out;
1487 }
1488
1489 udf_find_anchor(sb);
1490
1491 /* Fill in the rest of the superblock */
1492 sb->s_op = &udf_sb_ops;
1493 sb->dq_op = NULL;
1494 sb->s_dirt = 0;
1495 sb->s_magic = UDF_SUPER_MAGIC;
1496 sb->s_time_gran = 1000;
1497
1498 if (udf_load_partition(sb, &fileset)) {
1499 printk("UDF-fs: No partition found (1)\n");
1500 goto error_out;
1501 }
1502
1503 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1504
1505 if (UDF_SB_LVIDBH(sb)) {
1506 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1507 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1508 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1509
1510 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1511 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1512 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1513 UDF_MAX_READ_VERSION);
1514 goto error_out;
1515 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1516 sb->s_flags |= MS_RDONLY;
1517 }
1518
1519 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1520
1521 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1522 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1523 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1524 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1525 }
1526
1527 if (!UDF_SB_NUMPARTS(sb)) {
1528 printk("UDF-fs: No partition found (2)\n");
1529 goto error_out;
1530 }
1531
1532 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1533 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1534 sb->s_flags |= MS_RDONLY;
1535 }
1536
1537 if (udf_find_fileset(sb, &fileset, &rootdir)) {
1538 printk("UDF-fs: No fileset found\n");
1539 goto error_out;
1540 }
1541
1542 if (!silent) {
1543 kernel_timestamp ts;
1544 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1545 udf_info("UDF %s (%s) Mounting volume '%s', "
1546 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1547 UDFFS_VERSION, UDFFS_DATE,
1548 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1549 ts.typeAndTimezone);
1550 }
1551 if (!(sb->s_flags & MS_RDONLY))
1552 udf_open_lvid(sb);
1553
1554 /* Assign the root inode */
1555 /* assign inodes by physical block number */
1556 /* perhaps it's not extensible enough, but for now ... */
1557 inode = udf_iget(sb, rootdir);
1558 if (!inode) {
1559 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1560 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1561 goto error_out;
1562 }
1563
1564 /* Allocate a dentry for the root inode */
1565 sb->s_root = d_alloc_root(inode);
1566 if (!sb->s_root) {
1567 printk("UDF-fs: Couldn't allocate root dentry\n");
1568 iput(inode);
1569 goto error_out;
1570 }
1571 sb->s_maxbytes = MAX_LFS_FILESIZE;
1572 return 0;
1573
1574 error_out:
1575 if (UDF_SB_VAT(sb))
1576 iput(UDF_SB_VAT(sb));
1577 if (UDF_SB_NUMPARTS(sb)) {
1578 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1579 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1580 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1581 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1582 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1583 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace);
1584 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1585 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace);
1586 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1587 for (i = 0; i < 4; i++)
1588 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1589 }
1590 }
1591 #ifdef CONFIG_UDF_NLS
1592 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1593 unload_nls(UDF_SB(sb)->s_nls_map);
1594 #endif
1595 if (!(sb->s_flags & MS_RDONLY))
1596 udf_close_lvid(sb);
1597 brelse(UDF_SB_LVIDBH(sb));
1598 UDF_SB_FREE(sb);
1599 kfree(sbi);
1600 sb->s_fs_info = NULL;
1601
1602 return -EINVAL;
1603 }
1604
1605 void udf_error(struct super_block *sb, const char *function,
1606 const char *fmt, ...)
1607 {
1608 va_list args;
1609
1610 if (!(sb->s_flags & MS_RDONLY)) {
1611 /* mark sb error */
1612 sb->s_dirt = 1;
1613 }
1614 va_start(args, fmt);
1615 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1616 va_end(args);
1617 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1618 sb->s_id, function, error_buf);
1619 }
1620
1621 void udf_warning(struct super_block *sb, const char *function,
1622 const char *fmt, ...)
1623 {
1624 va_list args;
1625
1626 va_start(args, fmt);
1627 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1628 va_end(args);
1629 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1630 sb->s_id, function, error_buf);
1631 }
1632
1633 /*
1634 * udf_put_super
1635 *
1636 * PURPOSE
1637 * Prepare for destruction of the superblock.
1638 *
1639 * DESCRIPTION
1640 * Called before the filesystem is unmounted.
1641 *
1642 * HISTORY
1643 * July 1, 1997 - Andrew E. Mileski
1644 * Written, tested, and released.
1645 */
1646 static void udf_put_super(struct super_block *sb)
1647 {
1648 int i;
1649
1650 if (UDF_SB_VAT(sb))
1651 iput(UDF_SB_VAT(sb));
1652 if (UDF_SB_NUMPARTS(sb)) {
1653 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1654 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1655 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1656 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1657 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1658 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_uspace);
1659 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1660 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb), s_fspace);
1661 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1662 for (i = 0; i < 4; i++)
1663 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1664 }
1665 }
1666 #ifdef CONFIG_UDF_NLS
1667 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1668 unload_nls(UDF_SB(sb)->s_nls_map);
1669 #endif
1670 if (!(sb->s_flags & MS_RDONLY))
1671 udf_close_lvid(sb);
1672 brelse(UDF_SB_LVIDBH(sb));
1673 UDF_SB_FREE(sb);
1674 kfree(sb->s_fs_info);
1675 sb->s_fs_info = NULL;
1676 }
1677
1678 /*
1679 * udf_stat_fs
1680 *
1681 * PURPOSE
1682 * Return info about the filesystem.
1683 *
1684 * DESCRIPTION
1685 * Called by sys_statfs()
1686 *
1687 * HISTORY
1688 * July 1, 1997 - Andrew E. Mileski
1689 * Written, tested, and released.
1690 */
1691 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1692 {
1693 struct super_block *sb = dentry->d_sb;
1694
1695 buf->f_type = UDF_SUPER_MAGIC;
1696 buf->f_bsize = sb->s_blocksize;
1697 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1698 buf->f_bfree = udf_count_free(sb);
1699 buf->f_bavail = buf->f_bfree;
1700 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1701 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1702 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1703 buf->f_ffree = buf->f_bfree;
1704 /* __kernel_fsid_t f_fsid */
1705 buf->f_namelen = UDF_NAME_LEN - 2;
1706
1707 return 0;
1708 }
1709
1710 static unsigned char udf_bitmap_lookup[16] = {
1711 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1712 };
1713
1714 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1715 {
1716 struct buffer_head *bh = NULL;
1717 unsigned int accum = 0;
1718 int index;
1719 int block = 0, newblock;
1720 kernel_lb_addr loc;
1721 uint32_t bytes;
1722 uint8_t value;
1723 uint8_t *ptr;
1724 uint16_t ident;
1725 struct spaceBitmapDesc *bm;
1726
1727 lock_kernel();
1728
1729 loc.logicalBlockNum = bitmap->s_extPosition;
1730 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1731 bh = udf_read_ptagged(sb, loc, 0, &ident);
1732
1733 if (!bh) {
1734 printk(KERN_ERR "udf: udf_count_free failed\n");
1735 goto out;
1736 } else if (ident != TAG_IDENT_SBD) {
1737 brelse(bh);
1738 printk(KERN_ERR "udf: udf_count_free failed\n");
1739 goto out;
1740 }
1741
1742 bm = (struct spaceBitmapDesc *)bh->b_data;
1743 bytes = le32_to_cpu(bm->numOfBytes);
1744 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1745 ptr = (uint8_t *)bh->b_data;
1746
1747 while (bytes > 0) {
1748 while ((bytes > 0) && (index < sb->s_blocksize)) {
1749 value = ptr[index];
1750 accum += udf_bitmap_lookup[value & 0x0f];
1751 accum += udf_bitmap_lookup[value >> 4];
1752 index++;
1753 bytes--;
1754 }
1755 if (bytes) {
1756 brelse(bh);
1757 newblock = udf_get_lb_pblock(sb, loc, ++block);
1758 bh = udf_tread(sb, newblock);
1759 if (!bh) {
1760 udf_debug("read failed\n");
1761 goto out;
1762 }
1763 index = 0;
1764 ptr = (uint8_t *)bh->b_data;
1765 }
1766 }
1767 brelse(bh);
1768
1769 out:
1770 unlock_kernel();
1771
1772 return accum;
1773 }
1774
1775 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1776 {
1777 unsigned int accum = 0;
1778 uint32_t elen;
1779 kernel_lb_addr eloc;
1780 int8_t etype;
1781 struct extent_position epos;
1782
1783 lock_kernel();
1784
1785 epos.block = UDF_I_LOCATION(table);
1786 epos.offset = sizeof(struct unallocSpaceEntry);
1787 epos.bh = NULL;
1788
1789 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
1790 accum += (elen >> table->i_sb->s_blocksize_bits);
1791 }
1792 brelse(epos.bh);
1793
1794 unlock_kernel();
1795
1796 return accum;
1797 }
1798
1799 static unsigned int udf_count_free(struct super_block *sb)
1800 {
1801 unsigned int accum = 0;
1802
1803 if (UDF_SB_LVIDBH(sb)) {
1804 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) {
1805 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1806 if (accum == 0xFFFFFFFF)
1807 accum = 0;
1808 }
1809 }
1810
1811 if (accum)
1812 return accum;
1813
1814 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) {
1815 accum += udf_count_free_bitmap(sb,
1816 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1817 }
1818 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) {
1819 accum += udf_count_free_bitmap(sb,
1820 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1821 }
1822 if (accum)
1823 return accum;
1824
1825 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) {
1826 accum += udf_count_free_table(sb,
1827 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1828 }
1829 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) {
1830 accum += udf_count_free_table(sb,
1831 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1832 }
1833
1834 return accum;
1835 }
Support for the Chinese Samsung S3C2440 based development boards