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Fix dnotify/close race
[linux-2.6.22.y-op.git] / fs / udf / super.c
blob6658afb41cc7564ffeced0d42e0b35b0421baf0e
1 /*
2 * super.c
3 *
4 * PURPOSE
5 * Super block routines for the OSTA-UDF(tm) filesystem.
6 *
7 * DESCRIPTION
8 * OSTA-UDF(tm) = Optical Storage Technology Association
9 * Universal Disk Format.
10 *
11 * This code is based on version 2.00 of the UDF specification,
12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13 * http://www.osta.org/
14 * http://www.ecma.ch/
15 * http://www.iso.org/
16 *
17 * COPYRIGHT
18 * This file is distributed under the terms of the GNU General Public
19 * License (GPL). Copies of the GPL can be obtained from:
20 * ftp://prep.ai.mit.edu/pub/gnu/GPL
21 * Each contributing author retains all rights to their own work.
22 *
23 * (C) 1998 Dave Boynton
24 * (C) 1998-2004 Ben Fennema
25 * (C) 2000 Stelias Computing Inc
26 *
27 * HISTORY
28 *
29 * 09/24/98 dgb changed to allow compiling outside of kernel, and
30 * added some debugging.
31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
32 * 10/16/98 attempting some multi-session support
33 * 10/17/98 added freespace count for "df"
34 * 11/11/98 gr added novrs option
35 * 11/26/98 dgb added fileset,anchor mount options
36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced vol descs
37 * rewrote option handling based on isofs
38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
41 #include "udfdecl.h"
42
43 #include <linux/blkdev.h>
44 #include <linux/slab.h>
45 #include <linux/kernel.h>
46 #include <linux/module.h>
47 #include <linux/parser.h>
48 #include <linux/stat.h>
49 #include <linux/cdrom.h>
50 #include <linux/nls.h>
51 #include <linux/smp_lock.h>
52 #include <linux/buffer_head.h>
53 #include <linux/vfs.h>
54 #include <linux/vmalloc.h>
55 #include <asm/byteorder.h>
56
57 #include <linux/udf_fs.h>
58 #include "udf_sb.h"
59 #include "udf_i.h"
60
61 #include <linux/init.h>
62 #include <asm/uaccess.h>
63
64 #define VDS_POS_PRIMARY_VOL_DESC 0
65 #define VDS_POS_UNALLOC_SPACE_DESC 1
66 #define VDS_POS_LOGICAL_VOL_DESC 2
67 #define VDS_POS_PARTITION_DESC 3
68 #define VDS_POS_IMP_USE_VOL_DESC 4
69 #define VDS_POS_VOL_DESC_PTR 5
70 #define VDS_POS_TERMINATING_DESC 6
71 #define VDS_POS_LENGTH 7
72
73 static char error_buf[1024];
74
75 /* These are the "meat" - everything else is stuffing */
76 static int udf_fill_super(struct super_block *, void *, int);
77 static void udf_put_super(struct super_block *);
78 static void udf_write_super(struct super_block *);
79 static int udf_remount_fs(struct super_block *, int *, char *);
80 static int udf_check_valid(struct super_block *, int, int);
81 static int udf_vrs(struct super_block *sb, int silent);
82 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
84 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
85 static void udf_find_anchor(struct super_block *);
86 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
87 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
88 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
89 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
90 static void udf_open_lvid(struct super_block *);
91 static void udf_close_lvid(struct super_block *);
92 static unsigned int udf_count_free(struct super_block *);
93 static int udf_statfs(struct dentry *, struct kstatfs *);
94
95 /* UDF filesystem type */
96 static int udf_get_sb(struct file_system_type *fs_type,
97 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
98 {
99 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
100 }
101
102 static struct file_system_type udf_fstype = {
103 .owner = THIS_MODULE,
104 .name = "udf",
105 .get_sb = udf_get_sb,
106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108 };
109
110 static struct kmem_cache * udf_inode_cachep;
111
112 static struct inode *udf_alloc_inode(struct super_block *sb)
113 {
114 struct udf_inode_info *ei;
115 ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
116 if (!ei)
117 return NULL;
118
119 ei->i_unique = 0;
120 ei->i_lenExtents = 0;
121 ei->i_next_alloc_block = 0;
122 ei->i_next_alloc_goal = 0;
123 ei->i_strat4096 = 0;
124
125 return &ei->vfs_inode;
126 }
127
128 static void udf_destroy_inode(struct inode *inode)
129 {
130 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
131 }
132
133 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
134 {
135 struct udf_inode_info *ei = (struct udf_inode_info *) foo;
136
137 ei->i_ext.i_data = NULL;
138 inode_init_once(&ei->vfs_inode);
139 }
140
141 static int init_inodecache(void)
142 {
143 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
144 sizeof(struct udf_inode_info),
145 0, (SLAB_RECLAIM_ACCOUNT|
146 SLAB_MEM_SPREAD),
147 init_once, NULL);
148 if (udf_inode_cachep == NULL)
149 return -ENOMEM;
150 return 0;
151 }
152
153 static void destroy_inodecache(void)
154 {
155 kmem_cache_destroy(udf_inode_cachep);
156 }
157
158 /* Superblock operations */
159 static const struct super_operations udf_sb_ops = {
160 .alloc_inode = udf_alloc_inode,
161 .destroy_inode = udf_destroy_inode,
162 .write_inode = udf_write_inode,
163 .delete_inode = udf_delete_inode,
164 .clear_inode = udf_clear_inode,
165 .put_super = udf_put_super,
166 .write_super = udf_write_super,
167 .statfs = udf_statfs,
168 .remount_fs = udf_remount_fs,
169 };
170
171 struct udf_options
172 {
173 unsigned char novrs;
174 unsigned int blocksize;
175 unsigned int session;
176 unsigned int lastblock;
177 unsigned int anchor;
178 unsigned int volume;
179 unsigned short partition;
180 unsigned int fileset;
181 unsigned int rootdir;
182 unsigned int flags;
183 mode_t umask;
184 gid_t gid;
185 uid_t uid;
186 struct nls_table *nls_map;
187 };
188
189 static int __init init_udf_fs(void)
190 {
191 int err;
192 err = init_inodecache();
193 if (err)
194 goto out1;
195 err = register_filesystem(&udf_fstype);
196 if (err)
197 goto out;
198 return 0;
199 out:
200 destroy_inodecache();
201 out1:
202 return err;
203 }
204
205 static void __exit exit_udf_fs(void)
206 {
207 unregister_filesystem(&udf_fstype);
208 destroy_inodecache();
209 }
210
211 module_init(init_udf_fs)
212 module_exit(exit_udf_fs)
213
214 /*
215 * udf_parse_options
216 *
217 * PURPOSE
218 * Parse mount options.
219 *
220 * DESCRIPTION
221 * The following mount options are supported:
222 *
223 * gid= Set the default group.
224 * umask= Set the default umask.
225 * uid= Set the default user.
226 * bs= Set the block size.
227 * unhide Show otherwise hidden files.
228 * undelete Show deleted files in lists.
229 * adinicb Embed data in the inode (default)
230 * noadinicb Don't embed data in the inode
231 * shortad Use short ad's
232 * longad Use long ad's (default)
233 * nostrict Unset strict conformance
234 * iocharset= Set the NLS character set
235 *
236 * The remaining are for debugging and disaster recovery:
237 *
238 * novrs Skip volume sequence recognition
239 *
240 * The following expect a offset from 0.
241 *
242 * session= Set the CDROM session (default= last session)
243 * anchor= Override standard anchor location. (default= 256)
244 * volume= Override the VolumeDesc location. (unused)
245 * partition= Override the PartitionDesc location. (unused)
246 * lastblock= Set the last block of the filesystem/
247 *
248 * The following expect a offset from the partition root.
249 *
250 * fileset= Override the fileset block location. (unused)
251 * rootdir= Override the root directory location. (unused)
252 * WARNING: overriding the rootdir to a non-directory may
253 * yield highly unpredictable results.
254 *
255 * PRE-CONDITIONS
256 * options Pointer to mount options string.
257 * uopts Pointer to mount options variable.
258 *
259 * POST-CONDITIONS
260 * <return> 1 Mount options parsed okay.
261 * <return> 0 Error parsing mount options.
262 *
263 * HISTORY
264 * July 1, 1997 - Andrew E. Mileski
265 * Written, tested, and released.
266 */
267
268 enum {
269 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
270 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
271 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
272 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
273 Opt_rootdir, Opt_utf8, Opt_iocharset,
274 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
275 };
276
277 static match_table_t tokens = {
278 {Opt_novrs, "novrs"},
279 {Opt_nostrict, "nostrict"},
280 {Opt_bs, "bs=%u"},
281 {Opt_unhide, "unhide"},
282 {Opt_undelete, "undelete"},
283 {Opt_noadinicb, "noadinicb"},
284 {Opt_adinicb, "adinicb"},
285 {Opt_shortad, "shortad"},
286 {Opt_longad, "longad"},
287 {Opt_uforget, "uid=forget"},
288 {Opt_uignore, "uid=ignore"},
289 {Opt_gforget, "gid=forget"},
290 {Opt_gignore, "gid=ignore"},
291 {Opt_gid, "gid=%u"},
292 {Opt_uid, "uid=%u"},
293 {Opt_umask, "umask=%o"},
294 {Opt_session, "session=%u"},
295 {Opt_lastblock, "lastblock=%u"},
296 {Opt_anchor, "anchor=%u"},
297 {Opt_volume, "volume=%u"},
298 {Opt_partition, "partition=%u"},
299 {Opt_fileset, "fileset=%u"},
300 {Opt_rootdir, "rootdir=%u"},
301 {Opt_utf8, "utf8"},
302 {Opt_iocharset, "iocharset=%s"},
303 {Opt_err, NULL}
304 };
305
306 static int
307 udf_parse_options(char *options, struct udf_options *uopt)
308 {
309 char *p;
310 int option;
311
312 uopt->novrs = 0;
313 uopt->blocksize = 2048;
314 uopt->partition = 0xFFFF;
315 uopt->session = 0xFFFFFFFF;
316 uopt->lastblock = 0;
317 uopt->anchor = 0;
318 uopt->volume = 0xFFFFFFFF;
319 uopt->rootdir = 0xFFFFFFFF;
320 uopt->fileset = 0xFFFFFFFF;
321 uopt->nls_map = NULL;
322
323 if (!options)
324 return 1;
325
326 while ((p = strsep(&options, ",")) != NULL)
327 {
328 substring_t args[MAX_OPT_ARGS];
329 int token;
330 if (!*p)
331 continue;
332
333 token = match_token(p, tokens, args);
334 switch (token)
335 {
336 case Opt_novrs:
337 uopt->novrs = 1;
338 case Opt_bs:
339 if (match_int(&args[0], &option))
340 return 0;
341 uopt->blocksize = option;
342 break;
343 case Opt_unhide:
344 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
345 break;
346 case Opt_undelete:
347 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
348 break;
349 case Opt_noadinicb:
350 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
351 break;
352 case Opt_adinicb:
353 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
354 break;
355 case Opt_shortad:
356 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
357 break;
358 case Opt_longad:
359 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
360 break;
361 case Opt_gid:
362 if (match_int(args, &option))
363 return 0;
364 uopt->gid = option;
365 break;
366 case Opt_uid:
367 if (match_int(args, &option))
368 return 0;
369 uopt->uid = option;
370 break;
371 case Opt_umask:
372 if (match_octal(args, &option))
373 return 0;
374 uopt->umask = option;
375 break;
376 case Opt_nostrict:
377 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
378 break;
379 case Opt_session:
380 if (match_int(args, &option))
381 return 0;
382 uopt->session = option;
383 break;
384 case Opt_lastblock:
385 if (match_int(args, &option))
386 return 0;
387 uopt->lastblock = option;
388 break;
389 case Opt_anchor:
390 if (match_int(args, &option))
391 return 0;
392 uopt->anchor = option;
393 break;
394 case Opt_volume:
395 if (match_int(args, &option))
396 return 0;
397 uopt->volume = option;
398 break;
399 case Opt_partition:
400 if (match_int(args, &option))
401 return 0;
402 uopt->partition = option;
403 break;
404 case Opt_fileset:
405 if (match_int(args, &option))
406 return 0;
407 uopt->fileset = option;
408 break;
409 case Opt_rootdir:
410 if (match_int(args, &option))
411 return 0;
412 uopt->rootdir = option;
413 break;
414 case Opt_utf8:
415 uopt->flags |= (1 << UDF_FLAG_UTF8);
416 break;
417 #ifdef CONFIG_UDF_NLS
418 case Opt_iocharset:
419 uopt->nls_map = load_nls(args[0].from);
420 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
421 break;
422 #endif
423 case Opt_uignore:
424 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
425 break;
426 case Opt_uforget:
427 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
428 break;
429 case Opt_gignore:
430 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
431 break;
432 case Opt_gforget:
433 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
434 break;
435 default:
436 printk(KERN_ERR "udf: bad mount option \"%s\" "
437 "or missing value\n", p);
438 return 0;
439 }
440 }
441 return 1;
442 }
443
444 void
445 udf_write_super(struct super_block *sb)
446 {
447 lock_kernel();
448 if (!(sb->s_flags & MS_RDONLY))
449 udf_open_lvid(sb);
450 sb->s_dirt = 0;
451 unlock_kernel();
452 }
453
454 static int
455 udf_remount_fs(struct super_block *sb, int *flags, char *options)
456 {
457 struct udf_options uopt;
458
459 uopt.flags = UDF_SB(sb)->s_flags ;
460 uopt.uid = UDF_SB(sb)->s_uid ;
461 uopt.gid = UDF_SB(sb)->s_gid ;
462 uopt.umask = UDF_SB(sb)->s_umask ;
463
464 if ( !udf_parse_options(options, &uopt) )
465 return -EINVAL;
466
467 UDF_SB(sb)->s_flags = uopt.flags;
468 UDF_SB(sb)->s_uid = uopt.uid;
469 UDF_SB(sb)->s_gid = uopt.gid;
470 UDF_SB(sb)->s_umask = uopt.umask;
471
472 if (UDF_SB_LVIDBH(sb)) {
473 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
474 if (write_rev > UDF_MAX_WRITE_VERSION)
475 *flags |= MS_RDONLY;
476 }
477
478 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
479 return 0;
480 if (*flags & MS_RDONLY)
481 udf_close_lvid(sb);
482 else
483 udf_open_lvid(sb);
484
485 return 0;
486 }
487
488 /*
489 * udf_set_blocksize
490 *
491 * PURPOSE
492 * Set the block size to be used in all transfers.
493 *
494 * DESCRIPTION
495 * To allow room for a DMA transfer, it is best to guess big when unsure.
496 * This routine picks 2048 bytes as the blocksize when guessing. This
497 * should be adequate until devices with larger block sizes become common.
498 *
499 * Note that the Linux kernel can currently only deal with blocksizes of
500 * 512, 1024, 2048, 4096, and 8192 bytes.
501 *
502 * PRE-CONDITIONS
503 * sb Pointer to _locked_ superblock.
504 *
505 * POST-CONDITIONS
506 * sb->s_blocksize Blocksize.
507 * sb->s_blocksize_bits log2 of blocksize.
508 * <return> 0 Blocksize is valid.
509 * <return> 1 Blocksize is invalid.
510 *
511 * HISTORY
512 * July 1, 1997 - Andrew E. Mileski
513 * Written, tested, and released.
514 */
515 static int
516 udf_set_blocksize(struct super_block *sb, int bsize)
517 {
518 if (!sb_min_blocksize(sb, bsize)) {
519 udf_debug("Bad block size (%d)\n", bsize);
520 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
521 return 0;
522 }
523 return sb->s_blocksize;
524 }
525
526 static int
527 udf_vrs(struct super_block *sb, int silent)
528 {
529 struct volStructDesc *vsd = NULL;
530 int sector = 32768;
531 int sectorsize;
532 struct buffer_head *bh = NULL;
533 int iso9660=0;
534 int nsr02=0;
535 int nsr03=0;
536
537 /* Block size must be a multiple of 512 */
538 if (sb->s_blocksize & 511)
539 return 0;
540
541 if (sb->s_blocksize < sizeof(struct volStructDesc))
542 sectorsize = sizeof(struct volStructDesc);
543 else
544 sectorsize = sb->s_blocksize;
545
546 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
547
548 udf_debug("Starting at sector %u (%ld byte sectors)\n",
549 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
550 /* Process the sequence (if applicable) */
551 for (;!nsr02 && !nsr03; sector += sectorsize)
552 {
553 /* Read a block */
554 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
555 if (!bh)
556 break;
557
558 /* Look for ISO descriptors */
559 vsd = (struct volStructDesc *)(bh->b_data +
560 (sector & (sb->s_blocksize - 1)));
561
562 if (vsd->stdIdent[0] == 0)
563 {
564 brelse(bh);
565 break;
566 }
567 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
568 {
569 iso9660 = sector;
570 switch (vsd->structType)
571 {
572 case 0:
573 udf_debug("ISO9660 Boot Record found\n");
574 break;
575 case 1:
576 udf_debug("ISO9660 Primary Volume Descriptor found\n");
577 break;
578 case 2:
579 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
580 break;
581 case 3:
582 udf_debug("ISO9660 Volume Partition Descriptor found\n");
583 break;
584 case 255:
585 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
586 break;
587 default:
588 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
589 break;
590 }
591 }
592 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
593 {
594 }
595 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
596 {
597 brelse(bh);
598 break;
599 }
600 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
601 {
602 nsr02 = sector;
603 }
604 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
605 {
606 nsr03 = sector;
607 }
608 brelse(bh);
609 }
610
611 if (nsr03)
612 return nsr03;
613 else if (nsr02)
614 return nsr02;
615 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
616 return -1;
617 else
618 return 0;
619 }
620
621 /*
622 * udf_find_anchor
623 *
624 * PURPOSE
625 * Find an anchor volume descriptor.
626 *
627 * PRE-CONDITIONS
628 * sb Pointer to _locked_ superblock.
629 * lastblock Last block on media.
630 *
631 * POST-CONDITIONS
632 * <return> 1 if not found, 0 if ok
633 *
634 * HISTORY
635 * July 1, 1997 - Andrew E. Mileski
636 * Written, tested, and released.
637 */
638 static void
639 udf_find_anchor(struct super_block *sb)
640 {
641 int lastblock = UDF_SB_LASTBLOCK(sb);
642 struct buffer_head *bh = NULL;
643 uint16_t ident;
644 uint32_t location;
645 int i;
646
647 if (lastblock)
648 {
649 int varlastblock = udf_variable_to_fixed(lastblock);
650 int last[] = { lastblock, lastblock - 2,
651 lastblock - 150, lastblock - 152,
652 varlastblock, varlastblock - 2,
653 varlastblock - 150, varlastblock - 152 };
654
655 lastblock = 0;
656
657 /* Search for an anchor volume descriptor pointer */
658
659 /* according to spec, anchor is in either:
660 * block 256
661 * lastblock-256
662 * lastblock
663 * however, if the disc isn't closed, it could be 512 */
664
665 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
666 if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
667 {
668 ident = location = 0;
669 }
670 else
671 {
672 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
673 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
674 brelse(bh);
675 }
676
677 if (ident == TAG_IDENT_AVDP)
678 {
679 if (location == last[i] - UDF_SB_SESSION(sb))
680 {
681 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
682 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
683 }
684 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
685 {
686 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
687 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
688 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
689 }
690 else
691 udf_debug("Anchor found at block %d, location mismatch %d.\n",
692 last[i], location);
693 }
694 else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
695 {
696 lastblock = last[i];
697 UDF_SB_ANCHOR(sb)[3] = 512;
698 }
699 else
700 {
701 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
702 {
703 ident = location = 0;
704 }
705 else
706 {
707 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
708 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
709 brelse(bh);
710 }
711
712 if (ident == TAG_IDENT_AVDP &&
713 location == last[i] - 256 - UDF_SB_SESSION(sb))
714 {
715 lastblock = last[i];
716 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
717 }
718 else
719 {
720 if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
721 {
722 ident = location = 0;
723 }
724 else
725 {
726 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
727 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
728 brelse(bh);
729 }
730
731 if (ident == TAG_IDENT_AVDP &&
732 location == udf_variable_to_fixed(last[i]) - 256)
733 {
734 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
735 lastblock = udf_variable_to_fixed(last[i]);
736 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
737 }
738 }
739 }
740 }
741 }
742
743 if (!lastblock)
744 {
745 /* We havn't found the lastblock. check 312 */
746 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
747 {
748 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
749 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
750 brelse(bh);
751
752 if (ident == TAG_IDENT_AVDP && location == 256)
753 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
754 }
755 }
756
757 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
758 if (UDF_SB_ANCHOR(sb)[i])
759 {
760 if (!(bh = udf_read_tagged(sb,
761 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
762 {
763 UDF_SB_ANCHOR(sb)[i] = 0;
764 }
765 else
766 {
767 brelse(bh);
768 if ((ident != TAG_IDENT_AVDP) && (i ||
769 (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
770 {
771 UDF_SB_ANCHOR(sb)[i] = 0;
772 }
773 }
774 }
775 }
776
777 UDF_SB_LASTBLOCK(sb) = lastblock;
778 }
779
780 static int
781 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
782 {
783 struct buffer_head *bh = NULL;
784 long lastblock;
785 uint16_t ident;
786
787 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
788 fileset->partitionReferenceNum != 0xFFFF)
789 {
790 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
791
792 if (!bh)
793 return 1;
794 else if (ident != TAG_IDENT_FSD)
795 {
796 brelse(bh);
797 return 1;
798 }
799
800 }
801
802 if (!bh) /* Search backwards through the partitions */
803 {
804 kernel_lb_addr newfileset;
805
806 return 1;
807
808 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
809 (newfileset.partitionReferenceNum != 0xFFFF &&
810 fileset->logicalBlockNum == 0xFFFFFFFF &&
811 fileset->partitionReferenceNum == 0xFFFF);
812 newfileset.partitionReferenceNum--)
813 {
814 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
815 newfileset.logicalBlockNum = 0;
816
817 do
818 {
819 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
820 if (!bh)
821 {
822 newfileset.logicalBlockNum ++;
823 continue;
824 }
825
826 switch (ident)
827 {
828 case TAG_IDENT_SBD:
829 {
830 struct spaceBitmapDesc *sp;
831 sp = (struct spaceBitmapDesc *)bh->b_data;
832 newfileset.logicalBlockNum += 1 +
833 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
834 >> sb->s_blocksize_bits);
835 brelse(bh);
836 break;
837 }
838 case TAG_IDENT_FSD:
839 {
840 *fileset = newfileset;
841 break;
842 }
843 default:
844 {
845 newfileset.logicalBlockNum ++;
846 brelse(bh);
847 bh = NULL;
848 break;
849 }
850 }
851 }
852 while (newfileset.logicalBlockNum < lastblock &&
853 fileset->logicalBlockNum == 0xFFFFFFFF &&
854 fileset->partitionReferenceNum == 0xFFFF);
855 }
856 }
857
858 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
859 fileset->partitionReferenceNum != 0xFFFF) && bh)
860 {
861 udf_debug("Fileset at block=%d, partition=%d\n",
862 fileset->logicalBlockNum, fileset->partitionReferenceNum);
863
864 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
865 udf_load_fileset(sb, bh, root);
866 brelse(bh);
867 return 0;
868 }
869 return 1;
870 }
871
872 static void
873 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
874 {
875 struct primaryVolDesc *pvoldesc;
876 time_t recording;
877 long recording_usec;
878 struct ustr instr;
879 struct ustr outstr;
880
881 pvoldesc = (struct primaryVolDesc *)bh->b_data;
882
883 if ( udf_stamp_to_time(&recording, &recording_usec,
884 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
885 {
886 kernel_timestamp ts;
887 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
888 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
889 recording, recording_usec,
890 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
891 UDF_SB_RECORDTIME(sb).tv_sec = recording;
892 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
893 }
894
895 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
896 {
897 if (udf_CS0toUTF8(&outstr, &instr))
898 {
899 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
900 outstr.u_len > 31 ? 31 : outstr.u_len);
901 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
902 }
903 }
904
905 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
906 {
907 if (udf_CS0toUTF8(&outstr, &instr))
908 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
909 }
910 }
911
912 static void
913 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
914 {
915 struct fileSetDesc *fset;
916
917 fset = (struct fileSetDesc *)bh->b_data;
918
919 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
920
921 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
922
923 udf_debug("Rootdir at block=%d, partition=%d\n",
924 root->logicalBlockNum, root->partitionReferenceNum);
925 }
926
927 static void
928 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
929 {
930 struct partitionDesc *p;
931 int i;
932
933 p = (struct partitionDesc *)bh->b_data;
934
935 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
936 {
937 udf_debug("Searching map: (%d == %d)\n",
938 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
939 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
940 {
941 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
942 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
943 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
944 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
945 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
946 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
947 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
948 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
949 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
950 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
951
952 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
953 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
954 {
955 struct partitionHeaderDesc *phd;
956
957 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
958 if (phd->unallocSpaceTable.extLength)
959 {
960 kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
961
962 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
963 udf_iget(sb, loc);
964 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
965 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
966 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
967 }
968 if (phd->unallocSpaceBitmap.extLength)
969 {
970 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
971 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
972 {
973 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
974 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
975 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
976 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
977 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
978 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
979 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
980 }
981 }
982 if (phd->partitionIntegrityTable.extLength)
983 udf_debug("partitionIntegrityTable (part %d)\n", i);
984 if (phd->freedSpaceTable.extLength)
985 {
986 kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
987
988 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
989 udf_iget(sb, loc);
990 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
991 udf_debug("freedSpaceTable (part %d) @ %ld\n",
992 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
993 }
994 if (phd->freedSpaceBitmap.extLength)
995 {
996 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
997 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
998 {
999 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1000 le32_to_cpu(phd->freedSpaceBitmap.extLength);
1001 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1002 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1003 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1004 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1005 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1006 }
1007 }
1008 }
1009 break;
1010 }
1011 }
1012 if (i == UDF_SB_NUMPARTS(sb))
1013 {
1014 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1015 }
1016 else
1017 {
1018 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1019 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1020 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1021 }
1022 }
1023
1024 static int
1025 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1026 {
1027 struct logicalVolDesc *lvd;
1028 int i, j, offset;
1029 uint8_t type;
1030
1031 lvd = (struct logicalVolDesc *)bh->b_data;
1032
1033 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1034
1035 for (i=0,offset=0;
1036 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1037 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1038 {
1039 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1040 if (type == 1)
1041 {
1042 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1043 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1044 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1045 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1046 UDF_SB_PARTFUNC(sb,i) = NULL;
1047 }
1048 else if (type == 2)
1049 {
1050 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1051 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1052 {
1053 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1054 {
1055 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1056 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1057 }
1058 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1059 {
1060 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1061 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1062 }
1063 }
1064 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1065 {
1066 uint32_t loc;
1067 uint16_t ident;
1068 struct sparingTable *st;
1069 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1070
1071 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1072 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1073 for (j=0; j<spm->numSparingTables; j++)
1074 {
1075 loc = le32_to_cpu(spm->locSparingTable[j]);
1076 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1077 udf_read_tagged(sb, loc, loc, &ident);
1078 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1079 {
1080 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1081 if (ident != 0 ||
1082 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1083 {
1084 brelse(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1085 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1086 }
1087 }
1088 }
1089 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1090 }
1091 else
1092 {
1093 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1094 continue;
1095 }
1096 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1097 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1098 }
1099 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1100 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1101 }
1102
1103 if (fileset)
1104 {
1105 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1106
1107 *fileset = lelb_to_cpu(la->extLocation);
1108 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1109 fileset->logicalBlockNum,
1110 fileset->partitionReferenceNum);
1111 }
1112 if (lvd->integritySeqExt.extLength)
1113 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1114 return 0;
1115 }
1116
1117 /*
1118 * udf_load_logicalvolint
1119 *
1120 */
1121 static void
1122 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1123 {
1124 struct buffer_head *bh = NULL;
1125 uint16_t ident;
1126
1127 while (loc.extLength > 0 &&
1128 (bh = udf_read_tagged(sb, loc.extLocation,
1129 loc.extLocation, &ident)) &&
1130 ident == TAG_IDENT_LVID)
1131 {
1132 UDF_SB_LVIDBH(sb) = bh;
1133
1134 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1135 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1136
1137 if (UDF_SB_LVIDBH(sb) != bh)
1138 brelse(bh);
1139 loc.extLength -= sb->s_blocksize;
1140 loc.extLocation ++;
1141 }
1142 if (UDF_SB_LVIDBH(sb) != bh)
1143 brelse(bh);
1144 }
1145
1146 /*
1147 * udf_process_sequence
1148 *
1149 * PURPOSE
1150 * Process a main/reserve volume descriptor sequence.
1151 *
1152 * PRE-CONDITIONS
1153 * sb Pointer to _locked_ superblock.
1154 * block First block of first extent of the sequence.
1155 * lastblock Lastblock of first extent of the sequence.
1156 *
1157 * HISTORY
1158 * July 1, 1997 - Andrew E. Mileski
1159 * Written, tested, and released.
1160 */
1161 static int
1162 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1163 {
1164 struct buffer_head *bh = NULL;
1165 struct udf_vds_record vds[VDS_POS_LENGTH];
1166 struct generic_desc *gd;
1167 struct volDescPtr *vdp;
1168 int done=0;
1169 int i,j;
1170 uint32_t vdsn;
1171 uint16_t ident;
1172 long next_s = 0, next_e = 0;
1173
1174 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1175
1176 /* Read the main descriptor sequence */
1177 for (;(!done && block <= lastblock); block++)
1178 {
1179
1180 bh = udf_read_tagged(sb, block, block, &ident);
1181 if (!bh)
1182 break;
1183
1184 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1185 gd = (struct generic_desc *)bh->b_data;
1186 vdsn = le32_to_cpu(gd->volDescSeqNum);
1187 switch (ident)
1188 {
1189 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1190 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1191 {
1192 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1193 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1194 }
1195 break;
1196 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1197 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1198 {
1199 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1200 vds[VDS_POS_VOL_DESC_PTR].block = block;
1201
1202 vdp = (struct volDescPtr *)bh->b_data;
1203 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1204 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1205 next_e = next_e >> sb->s_blocksize_bits;
1206 next_e += next_s;
1207 }
1208 break;
1209 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1210 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1211 {
1212 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1213 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1214 }
1215 break;
1216 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1217 if (!vds[VDS_POS_PARTITION_DESC].block)
1218 vds[VDS_POS_PARTITION_DESC].block = block;
1219 break;
1220 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1221 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1222 {
1223 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1224 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1225 }
1226 break;
1227 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1228 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1229 {
1230 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1231 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1232 }
1233 break;
1234 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1235 vds[VDS_POS_TERMINATING_DESC].block = block;
1236 if (next_e)
1237 {
1238 block = next_s;
1239 lastblock = next_e;
1240 next_s = next_e = 0;
1241 }
1242 else
1243 done = 1;
1244 break;
1245 }
1246 brelse(bh);
1247 }
1248 for (i=0; i<VDS_POS_LENGTH; i++)
1249 {
1250 if (vds[i].block)
1251 {
1252 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1253
1254 if (i == VDS_POS_PRIMARY_VOL_DESC)
1255 udf_load_pvoldesc(sb, bh);
1256 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1257 udf_load_logicalvol(sb, bh, fileset);
1258 else if (i == VDS_POS_PARTITION_DESC)
1259 {
1260 struct buffer_head *bh2 = NULL;
1261 udf_load_partdesc(sb, bh);
1262 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1263 {
1264 bh2 = udf_read_tagged(sb, j, j, &ident);
1265 gd = (struct generic_desc *)bh2->b_data;
1266 if (ident == TAG_IDENT_PD)
1267 udf_load_partdesc(sb, bh2);
1268 brelse(bh2);
1269 }
1270 }
1271 brelse(bh);
1272 }
1273 }
1274
1275 return 0;
1276 }
1277
1278 /*
1279 * udf_check_valid()
1280 */
1281 static int
1282 udf_check_valid(struct super_block *sb, int novrs, int silent)
1283 {
1284 long block;
1285
1286 if (novrs)
1287 {
1288 udf_debug("Validity check skipped because of novrs option\n");
1289 return 0;
1290 }
1291 /* Check that it is NSR02 compliant */
1292 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1293 else if ((block = udf_vrs(sb, silent)) == -1)
1294 {
1295 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1296 if (!UDF_SB_LASTBLOCK(sb))
1297 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1298 return 0;
1299 }
1300 else
1301 return !block;
1302 }
1303
1304 static int
1305 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1306 {
1307 struct anchorVolDescPtr *anchor;
1308 uint16_t ident;
1309 struct buffer_head *bh;
1310 long main_s, main_e, reserve_s, reserve_e;
1311 int i, j;
1312
1313 if (!sb)
1314 return 1;
1315
1316 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1317 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1318 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1319 {
1320 anchor = (struct anchorVolDescPtr *)bh->b_data;
1321
1322 /* Locate the main sequence */
1323 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1324 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1325 main_e = main_e >> sb->s_blocksize_bits;
1326 main_e += main_s;
1327
1328 /* Locate the reserve sequence */
1329 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1330 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1331 reserve_e = reserve_e >> sb->s_blocksize_bits;
1332 reserve_e += reserve_s;
1333
1334 brelse(bh);
1335
1336 /* Process the main & reserve sequences */
1337 /* responsible for finding the PartitionDesc(s) */
1338 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1339 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1340 {
1341 break;
1342 }
1343 }
1344 }
1345
1346 if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1347 udf_debug("No Anchor block found\n");
1348 return 1;
1349 } else
1350 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1351
1352 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1353 {
1354 switch (UDF_SB_PARTTYPE(sb, i))
1355 {
1356 case UDF_VIRTUAL_MAP15:
1357 case UDF_VIRTUAL_MAP20:
1358 {
1359 kernel_lb_addr ino;
1360
1361 if (!UDF_SB_LASTBLOCK(sb))
1362 {
1363 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1364 udf_find_anchor(sb);
1365 }
1366
1367 if (!UDF_SB_LASTBLOCK(sb))
1368 {
1369 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1370 return 1;
1371 }
1372
1373 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1374 {
1375 if (j != i &&
1376 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1377 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1378 {
1379 ino.partitionReferenceNum = j;
1380 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1381 UDF_SB_PARTROOT(sb,j);
1382 break;
1383 }
1384 }
1385
1386 if (j == UDF_SB_NUMPARTS(sb))
1387 return 1;
1388
1389 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1390 return 1;
1391
1392 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1393 {
1394 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1395 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1396 }
1397 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1398 {
1399 struct buffer_head *bh = NULL;
1400 uint32_t pos;
1401
1402 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1403 bh = sb_bread(sb, pos);
1404 if (!bh)
1405 return 1;
1406 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1407 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1408 udf_ext0_offset(UDF_SB_VAT(sb));
1409 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1410 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1411 brelse(bh);
1412 }
1413 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1414 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1415 }
1416 }
1417 }
1418 return 0;
1419 }
1420
1421 static void udf_open_lvid(struct super_block *sb)
1422 {
1423 if (UDF_SB_LVIDBH(sb))
1424 {
1425 int i;
1426 kernel_timestamp cpu_time;
1427
1428 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1429 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1430 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1431 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1432 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1433
1434 UDF_SB_LVID(sb)->descTag.descCRC =
1435 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1436 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1437
1438 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1439 for (i=0; i<16; i++)
1440 if (i != 4)
1441 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1442 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1443
1444 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1445 }
1446 }
1447
1448 static void udf_close_lvid(struct super_block *sb)
1449 {
1450 if (UDF_SB_LVIDBH(sb) &&
1451 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1452 {
1453 int i;
1454 kernel_timestamp cpu_time;
1455
1456 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1457 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1458 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1459 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1460 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1461 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1462 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1463 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1464 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1465 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1466 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1467
1468 UDF_SB_LVID(sb)->descTag.descCRC =
1469 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1470 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1471
1472 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1473 for (i=0; i<16; i++)
1474 if (i != 4)
1475 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1476 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1477
1478 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1479 }
1480 }
1481
1482 /*
1483 * udf_read_super
1484 *
1485 * PURPOSE
1486 * Complete the specified super block.
1487 *
1488 * PRE-CONDITIONS
1489 * sb Pointer to superblock to complete - never NULL.
1490 * sb->s_dev Device to read suberblock from.
1491 * options Pointer to mount options.
1492 * silent Silent flag.
1493 *
1494 * HISTORY
1495 * July 1, 1997 - Andrew E. Mileski
1496 * Written, tested, and released.
1497 */
1498 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1499 {
1500 int i;
1501 struct inode *inode=NULL;
1502 struct udf_options uopt;
1503 kernel_lb_addr rootdir, fileset;
1504 struct udf_sb_info *sbi;
1505
1506 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1507 uopt.uid = -1;
1508 uopt.gid = -1;
1509 uopt.umask = 0;
1510
1511 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1512 if (!sbi)
1513 return -ENOMEM;
1514 sb->s_fs_info = sbi;
1515 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1516
1517 mutex_init(&sbi->s_alloc_mutex);
1518
1519 if (!udf_parse_options((char *)options, &uopt))
1520 goto error_out;
1521
1522 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1523 uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1524 {
1525 udf_error(sb, "udf_read_super",
1526 "utf8 cannot be combined with iocharset\n");
1527 goto error_out;
1528 }
1529 #ifdef CONFIG_UDF_NLS
1530 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1531 {
1532 uopt.nls_map = load_nls_default();
1533 if (!uopt.nls_map)
1534 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1535 else
1536 udf_debug("Using default NLS map\n");
1537 }
1538 #endif
1539 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1540 uopt.flags |= (1 << UDF_FLAG_UTF8);
1541
1542 fileset.logicalBlockNum = 0xFFFFFFFF;
1543 fileset.partitionReferenceNum = 0xFFFF;
1544
1545 UDF_SB(sb)->s_flags = uopt.flags;
1546 UDF_SB(sb)->s_uid = uopt.uid;
1547 UDF_SB(sb)->s_gid = uopt.gid;
1548 UDF_SB(sb)->s_umask = uopt.umask;
1549 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1550
1551 /* Set the block size for all transfers */
1552 if (!udf_set_blocksize(sb, uopt.blocksize))
1553 goto error_out;
1554
1555 if ( uopt.session == 0xFFFFFFFF )
1556 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1557 else
1558 UDF_SB_SESSION(sb) = uopt.session;
1559
1560 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1561
1562 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1563 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1564 UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1565 UDF_SB_ANCHOR(sb)[3] = 256;
1566
1567 if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1568 {
1569 printk("UDF-fs: No VRS found\n");
1570 goto error_out;
1571 }
1572
1573 udf_find_anchor(sb);
1574
1575 /* Fill in the rest of the superblock */
1576 sb->s_op = &udf_sb_ops;
1577 sb->dq_op = NULL;
1578 sb->s_dirt = 0;
1579 sb->s_magic = UDF_SUPER_MAGIC;
1580 sb->s_time_gran = 1000;
1581
1582 if (udf_load_partition(sb, &fileset))
1583 {
1584 printk("UDF-fs: No partition found (1)\n");
1585 goto error_out;
1586 }
1587
1588 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1589
1590 if ( UDF_SB_LVIDBH(sb) )
1591 {
1592 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1593 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1594 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1595
1596 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1597 {
1598 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1599 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1600 UDF_MAX_READ_VERSION);
1601 goto error_out;
1602 }
1603 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1604 {
1605 sb->s_flags |= MS_RDONLY;
1606 }
1607
1608 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1609
1610 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1611 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1612 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1613 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1614 }
1615
1616 if ( !UDF_SB_NUMPARTS(sb) )
1617 {
1618 printk("UDF-fs: No partition found (2)\n");
1619 goto error_out;
1620 }
1621
1622 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1623 printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
1624 sb->s_flags |= MS_RDONLY;
1625 }
1626
1627 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1628 {
1629 printk("UDF-fs: No fileset found\n");
1630 goto error_out;
1631 }
1632
1633 if (!silent)
1634 {
1635 kernel_timestamp ts;
1636 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1637 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1638 UDFFS_VERSION, UDFFS_DATE,
1639 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1640 ts.typeAndTimezone);
1641 }
1642 if (!(sb->s_flags & MS_RDONLY))
1643 udf_open_lvid(sb);
1644
1645 /* Assign the root inode */
1646 /* assign inodes by physical block number */
1647 /* perhaps it's not extensible enough, but for now ... */
1648 inode = udf_iget(sb, rootdir);
1649 if (!inode)
1650 {
1651 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1652 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1653 goto error_out;
1654 }
1655
1656 /* Allocate a dentry for the root inode */
1657 sb->s_root = d_alloc_root(inode);
1658 if (!sb->s_root)
1659 {
1660 printk("UDF-fs: Couldn't allocate root dentry\n");
1661 iput(inode);
1662 goto error_out;
1663 }
1664 sb->s_maxbytes = MAX_LFS_FILESIZE;
1665 return 0;
1666
1667 error_out:
1668 if (UDF_SB_VAT(sb))
1669 iput(UDF_SB_VAT(sb));
1670 if (UDF_SB_NUMPARTS(sb))
1671 {
1672 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1673 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1674 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1675 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1676 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1677 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1678 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1679 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1680 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1681 {
1682 for (i=0; i<4; i++)
1683 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1684 }
1685 }
1686 #ifdef CONFIG_UDF_NLS
1687 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1688 unload_nls(UDF_SB(sb)->s_nls_map);
1689 #endif
1690 if (!(sb->s_flags & MS_RDONLY))
1691 udf_close_lvid(sb);
1692 brelse(UDF_SB_LVIDBH(sb));
1693 UDF_SB_FREE(sb);
1694 kfree(sbi);
1695 sb->s_fs_info = NULL;
1696 return -EINVAL;
1697 }
1698
1699 void udf_error(struct super_block *sb, const char *function,
1700 const char *fmt, ...)
1701 {
1702 va_list args;
1703
1704 if (!(sb->s_flags & MS_RDONLY))
1705 {
1706 /* mark sb error */
1707 sb->s_dirt = 1;
1708 }
1709 va_start(args, fmt);
1710 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1711 va_end(args);
1712 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1713 sb->s_id, function, error_buf);
1714 }
1715
1716 void udf_warning(struct super_block *sb, const char *function,
1717 const char *fmt, ...)
1718 {
1719 va_list args;
1720
1721 va_start (args, fmt);
1722 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1723 va_end(args);
1724 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1725 sb->s_id, function, error_buf);
1726 }
1727
1728 /*
1729 * udf_put_super
1730 *
1731 * PURPOSE
1732 * Prepare for destruction of the superblock.
1733 *
1734 * DESCRIPTION
1735 * Called before the filesystem is unmounted.
1736 *
1737 * HISTORY
1738 * July 1, 1997 - Andrew E. Mileski
1739 * Written, tested, and released.
1740 */
1741 static void
1742 udf_put_super(struct super_block *sb)
1743 {
1744 int i;
1745
1746 if (UDF_SB_VAT(sb))
1747 iput(UDF_SB_VAT(sb));
1748 if (UDF_SB_NUMPARTS(sb))
1749 {
1750 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1751 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1752 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1753 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1754 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1755 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1756 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1757 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1758 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1759 {
1760 for (i=0; i<4; i++)
1761 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1762 }
1763 }
1764 #ifdef CONFIG_UDF_NLS
1765 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1766 unload_nls(UDF_SB(sb)->s_nls_map);
1767 #endif
1768 if (!(sb->s_flags & MS_RDONLY))
1769 udf_close_lvid(sb);
1770 brelse(UDF_SB_LVIDBH(sb));
1771 UDF_SB_FREE(sb);
1772 kfree(sb->s_fs_info);
1773 sb->s_fs_info = NULL;
1774 }
1775
1776 /*
1777 * udf_stat_fs
1778 *
1779 * PURPOSE
1780 * Return info about the filesystem.
1781 *
1782 * DESCRIPTION
1783 * Called by sys_statfs()
1784 *
1785 * HISTORY
1786 * July 1, 1997 - Andrew E. Mileski
1787 * Written, tested, and released.
1788 */
1789 static int
1790 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1791 {
1792 struct super_block *sb = dentry->d_sb;
1793
1794 buf->f_type = UDF_SUPER_MAGIC;
1795 buf->f_bsize = sb->s_blocksize;
1796 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1797 buf->f_bfree = udf_count_free(sb);
1798 buf->f_bavail = buf->f_bfree;
1799 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1800 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1801 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1802 buf->f_ffree = buf->f_bfree;
1803 /* __kernel_fsid_t f_fsid */
1804 buf->f_namelen = UDF_NAME_LEN-2;
1805
1806 return 0;
1807 }
1808
1809 static unsigned char udf_bitmap_lookup[16] = {
1810 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1811 };
1812
1813 static unsigned int
1814 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1815 {
1816 struct buffer_head *bh = NULL;
1817 unsigned int accum = 0;
1818 int index;
1819 int block = 0, newblock;
1820 kernel_lb_addr loc;
1821 uint32_t bytes;
1822 uint8_t value;
1823 uint8_t *ptr;
1824 uint16_t ident;
1825 struct spaceBitmapDesc *bm;
1826
1827 lock_kernel();
1828
1829 loc.logicalBlockNum = bitmap->s_extPosition;
1830 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1831 bh = udf_read_ptagged(sb, loc, 0, &ident);
1832
1833 if (!bh)
1834 {
1835 printk(KERN_ERR "udf: udf_count_free failed\n");
1836 goto out;
1837 }
1838 else if (ident != TAG_IDENT_SBD)
1839 {
1840 brelse(bh);
1841 printk(KERN_ERR "udf: udf_count_free failed\n");
1842 goto out;
1843 }
1844
1845 bm = (struct spaceBitmapDesc *)bh->b_data;
1846 bytes = le32_to_cpu(bm->numOfBytes);
1847 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1848 ptr = (uint8_t *)bh->b_data;
1849
1850 while ( bytes > 0 )
1851 {
1852 while ((bytes > 0) && (index < sb->s_blocksize))
1853 {
1854 value = ptr[index];
1855 accum += udf_bitmap_lookup[ value & 0x0f ];
1856 accum += udf_bitmap_lookup[ value >> 4 ];
1857 index++;
1858 bytes--;
1859 }
1860 if ( bytes )
1861 {
1862 brelse(bh);
1863 newblock = udf_get_lb_pblock(sb, loc, ++block);
1864 bh = udf_tread(sb, newblock);
1865 if (!bh)
1866 {
1867 udf_debug("read failed\n");
1868 goto out;
1869 }
1870 index = 0;
1871 ptr = (uint8_t *)bh->b_data;
1872 }
1873 }
1874 brelse(bh);
1875
1876 out:
1877 unlock_kernel();
1878
1879 return accum;
1880 }
1881
1882 static unsigned int
1883 udf_count_free_table(struct super_block *sb, struct inode * table)
1884 {
1885 unsigned int accum = 0;
1886 uint32_t elen;
1887 kernel_lb_addr eloc;
1888 int8_t etype;
1889 struct extent_position epos;
1890
1891 lock_kernel();
1892
1893 epos.block = UDF_I_LOCATION(table);
1894 epos.offset = sizeof(struct unallocSpaceEntry);
1895 epos.bh = NULL;
1896
1897 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1898 accum += (elen >> table->i_sb->s_blocksize_bits);
1899 brelse(epos.bh);
1900
1901 unlock_kernel();
1902
1903 return accum;
1904 }
1905
1906 static unsigned int
1907 udf_count_free(struct super_block *sb)
1908 {
1909 unsigned int accum = 0;
1910
1911 if (UDF_SB_LVIDBH(sb))
1912 {
1913 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1914 {
1915 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1916
1917 if (accum == 0xFFFFFFFF)
1918 accum = 0;
1919 }
1920 }
1921
1922 if (accum)
1923 return accum;
1924
1925 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1926 {
1927 accum += udf_count_free_bitmap(sb,
1928 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1929 }
1930 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1931 {
1932 accum += udf_count_free_bitmap(sb,
1933 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1934 }
1935 if (accum)
1936 return accum;
1937
1938 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1939 {
1940 accum += udf_count_free_table(sb,
1941 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1942 }
1943 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1944 {
1945 accum += udf_count_free_table(sb,
1946 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1947 }
1948
1949 return accum;
1950 }
linux v2.6.22.y-op