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udf: Try harder when looking for VAT inode
[linux-2.6/mini2440.git] / fs / udf / super.c
blob1e4543cbcd276decb1b43942e999b9f2f851b145
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
37 * vol descs. 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 <linux/errno.h>
56 #include <linux/mount.h>
57 #include <linux/seq_file.h>
58 #include <linux/bitmap.h>
59 #include <linux/crc-itu-t.h>
60 #include <asm/byteorder.h>
61
62 #include "udf_sb.h"
63 #include "udf_i.h"
64
65 #include <linux/init.h>
66 #include <asm/uaccess.h>
67
68 #define VDS_POS_PRIMARY_VOL_DESC 0
69 #define VDS_POS_UNALLOC_SPACE_DESC 1
70 #define VDS_POS_LOGICAL_VOL_DESC 2
71 #define VDS_POS_PARTITION_DESC 3
72 #define VDS_POS_IMP_USE_VOL_DESC 4
73 #define VDS_POS_VOL_DESC_PTR 5
74 #define VDS_POS_TERMINATING_DESC 6
75 #define VDS_POS_LENGTH 7
76
77 #define UDF_DEFAULT_BLOCKSIZE 2048
78
79 static char error_buf[1024];
80
81 /* These are the "meat" - everything else is stuffing */
82 static int udf_fill_super(struct super_block *, void *, int);
83 static void udf_put_super(struct super_block *);
84 static int udf_sync_fs(struct super_block *, int);
85 static int udf_remount_fs(struct super_block *, int *, char *);
86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
88 struct kernel_lb_addr *);
89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
90 struct kernel_lb_addr *);
91 static void udf_open_lvid(struct super_block *);
92 static void udf_close_lvid(struct super_block *);
93 static unsigned int udf_count_free(struct super_block *);
94 static int udf_statfs(struct dentry *, struct kstatfs *);
95 static int udf_show_options(struct seq_file *, struct vfsmount *);
96 static void udf_error(struct super_block *sb, const char *function,
97 const char *fmt, ...);
98
99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
100 {
101 struct logicalVolIntegrityDesc *lvid =
102 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
103 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
104 __u32 offset = number_of_partitions * 2 *
105 sizeof(uint32_t)/sizeof(uint8_t);
106 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
107 }
108
109 /* UDF filesystem type */
110 static int udf_get_sb(struct file_system_type *fs_type,
111 int flags, const char *dev_name, void *data,
112 struct vfsmount *mnt)
113 {
114 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
115 }
116
117 static struct file_system_type udf_fstype = {
118 .owner = THIS_MODULE,
119 .name = "udf",
120 .get_sb = udf_get_sb,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
123 };
124
125 static struct kmem_cache *udf_inode_cachep;
126
127 static struct inode *udf_alloc_inode(struct super_block *sb)
128 {
129 struct udf_inode_info *ei;
130 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
131 if (!ei)
132 return NULL;
133
134 ei->i_unique = 0;
135 ei->i_lenExtents = 0;
136 ei->i_next_alloc_block = 0;
137 ei->i_next_alloc_goal = 0;
138 ei->i_strat4096 = 0;
139
140 return &ei->vfs_inode;
141 }
142
143 static void udf_destroy_inode(struct inode *inode)
144 {
145 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
146 }
147
148 static void init_once(void *foo)
149 {
150 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
151
152 ei->i_ext.i_data = NULL;
153 inode_init_once(&ei->vfs_inode);
154 }
155
156 static int init_inodecache(void)
157 {
158 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
159 sizeof(struct udf_inode_info),
160 0, (SLAB_RECLAIM_ACCOUNT |
161 SLAB_MEM_SPREAD),
162 init_once);
163 if (!udf_inode_cachep)
164 return -ENOMEM;
165 return 0;
166 }
167
168 static void destroy_inodecache(void)
169 {
170 kmem_cache_destroy(udf_inode_cachep);
171 }
172
173 /* Superblock operations */
174 static const struct super_operations udf_sb_ops = {
175 .alloc_inode = udf_alloc_inode,
176 .destroy_inode = udf_destroy_inode,
177 .write_inode = udf_write_inode,
178 .delete_inode = udf_delete_inode,
179 .clear_inode = udf_clear_inode,
180 .put_super = udf_put_super,
181 .sync_fs = udf_sync_fs,
182 .statfs = udf_statfs,
183 .remount_fs = udf_remount_fs,
184 .show_options = udf_show_options,
185 };
186
187 struct udf_options {
188 unsigned char novrs;
189 unsigned int blocksize;
190 unsigned int session;
191 unsigned int lastblock;
192 unsigned int anchor;
193 unsigned int volume;
194 unsigned short partition;
195 unsigned int fileset;
196 unsigned int rootdir;
197 unsigned int flags;
198 mode_t umask;
199 gid_t gid;
200 uid_t uid;
201 mode_t fmode;
202 mode_t dmode;
203 struct nls_table *nls_map;
204 };
205
206 static int __init init_udf_fs(void)
207 {
208 int err;
209
210 err = init_inodecache();
211 if (err)
212 goto out1;
213 err = register_filesystem(&udf_fstype);
214 if (err)
215 goto out;
216
217 return 0;
218
219 out:
220 destroy_inodecache();
221
222 out1:
223 return err;
224 }
225
226 static void __exit exit_udf_fs(void)
227 {
228 unregister_filesystem(&udf_fstype);
229 destroy_inodecache();
230 }
231
232 module_init(init_udf_fs)
233 module_exit(exit_udf_fs)
234
235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
236 {
237 struct udf_sb_info *sbi = UDF_SB(sb);
238
239 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
240 GFP_KERNEL);
241 if (!sbi->s_partmaps) {
242 udf_error(sb, __func__,
243 "Unable to allocate space for %d partition maps",
244 count);
245 sbi->s_partitions = 0;
246 return -ENOMEM;
247 }
248
249 sbi->s_partitions = count;
250 return 0;
251 }
252
253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
254 {
255 struct super_block *sb = mnt->mnt_sb;
256 struct udf_sb_info *sbi = UDF_SB(sb);
257
258 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
259 seq_puts(seq, ",nostrict");
260 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
261 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
262 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263 seq_puts(seq, ",unhide");
264 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
265 seq_puts(seq, ",undelete");
266 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
267 seq_puts(seq, ",noadinicb");
268 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
269 seq_puts(seq, ",shortad");
270 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
271 seq_puts(seq, ",uid=forget");
272 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
273 seq_puts(seq, ",uid=ignore");
274 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
275 seq_puts(seq, ",gid=forget");
276 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
277 seq_puts(seq, ",gid=ignore");
278 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
279 seq_printf(seq, ",uid=%u", sbi->s_uid);
280 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
281 seq_printf(seq, ",gid=%u", sbi->s_gid);
282 if (sbi->s_umask != 0)
283 seq_printf(seq, ",umask=%o", sbi->s_umask);
284 if (sbi->s_fmode != UDF_INVALID_MODE)
285 seq_printf(seq, ",mode=%o", sbi->s_fmode);
286 if (sbi->s_dmode != UDF_INVALID_MODE)
287 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
288 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
289 seq_printf(seq, ",session=%u", sbi->s_session);
290 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
291 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
292 if (sbi->s_anchor != 0)
293 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
294 /*
295 * volume, partition, fileset and rootdir seem to be ignored
296 * currently
297 */
298 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
299 seq_puts(seq, ",utf8");
300 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
301 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
302
303 return 0;
304 }
305
306 /*
307 * udf_parse_options
308 *
309 * PURPOSE
310 * Parse mount options.
311 *
312 * DESCRIPTION
313 * The following mount options are supported:
314 *
315 * gid= Set the default group.
316 * umask= Set the default umask.
317 * mode= Set the default file permissions.
318 * dmode= Set the default directory permissions.
319 * uid= Set the default user.
320 * bs= Set the block size.
321 * unhide Show otherwise hidden files.
322 * undelete Show deleted files in lists.
323 * adinicb Embed data in the inode (default)
324 * noadinicb Don't embed data in the inode
325 * shortad Use short ad's
326 * longad Use long ad's (default)
327 * nostrict Unset strict conformance
328 * iocharset= Set the NLS character set
329 *
330 * The remaining are for debugging and disaster recovery:
331 *
332 * novrs Skip volume sequence recognition
333 *
334 * The following expect a offset from 0.
335 *
336 * session= Set the CDROM session (default= last session)
337 * anchor= Override standard anchor location. (default= 256)
338 * volume= Override the VolumeDesc location. (unused)
339 * partition= Override the PartitionDesc location. (unused)
340 * lastblock= Set the last block of the filesystem/
341 *
342 * The following expect a offset from the partition root.
343 *
344 * fileset= Override the fileset block location. (unused)
345 * rootdir= Override the root directory location. (unused)
346 * WARNING: overriding the rootdir to a non-directory may
347 * yield highly unpredictable results.
348 *
349 * PRE-CONDITIONS
350 * options Pointer to mount options string.
351 * uopts Pointer to mount options variable.
352 *
353 * POST-CONDITIONS
354 * <return> 1 Mount options parsed okay.
355 * <return> 0 Error parsing mount options.
356 *
357 * HISTORY
358 * July 1, 1997 - Andrew E. Mileski
359 * Written, tested, and released.
360 */
361
362 enum {
363 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
364 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
365 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
366 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
367 Opt_rootdir, Opt_utf8, Opt_iocharset,
368 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
369 Opt_fmode, Opt_dmode
370 };
371
372 static const match_table_t tokens = {
373 {Opt_novrs, "novrs"},
374 {Opt_nostrict, "nostrict"},
375 {Opt_bs, "bs=%u"},
376 {Opt_unhide, "unhide"},
377 {Opt_undelete, "undelete"},
378 {Opt_noadinicb, "noadinicb"},
379 {Opt_adinicb, "adinicb"},
380 {Opt_shortad, "shortad"},
381 {Opt_longad, "longad"},
382 {Opt_uforget, "uid=forget"},
383 {Opt_uignore, "uid=ignore"},
384 {Opt_gforget, "gid=forget"},
385 {Opt_gignore, "gid=ignore"},
386 {Opt_gid, "gid=%u"},
387 {Opt_uid, "uid=%u"},
388 {Opt_umask, "umask=%o"},
389 {Opt_session, "session=%u"},
390 {Opt_lastblock, "lastblock=%u"},
391 {Opt_anchor, "anchor=%u"},
392 {Opt_volume, "volume=%u"},
393 {Opt_partition, "partition=%u"},
394 {Opt_fileset, "fileset=%u"},
395 {Opt_rootdir, "rootdir=%u"},
396 {Opt_utf8, "utf8"},
397 {Opt_iocharset, "iocharset=%s"},
398 {Opt_fmode, "mode=%o"},
399 {Opt_dmode, "dmode=%o"},
400 {Opt_err, NULL}
401 };
402
403 static int udf_parse_options(char *options, struct udf_options *uopt,
404 bool remount)
405 {
406 char *p;
407 int option;
408
409 uopt->novrs = 0;
410 uopt->partition = 0xFFFF;
411 uopt->session = 0xFFFFFFFF;
412 uopt->lastblock = 0;
413 uopt->anchor = 0;
414 uopt->volume = 0xFFFFFFFF;
415 uopt->rootdir = 0xFFFFFFFF;
416 uopt->fileset = 0xFFFFFFFF;
417 uopt->nls_map = NULL;
418
419 if (!options)
420 return 1;
421
422 while ((p = strsep(&options, ",")) != NULL) {
423 substring_t args[MAX_OPT_ARGS];
424 int token;
425 if (!*p)
426 continue;
427
428 token = match_token(p, tokens, args);
429 switch (token) {
430 case Opt_novrs:
431 uopt->novrs = 1;
432 break;
433 case Opt_bs:
434 if (match_int(&args[0], &option))
435 return 0;
436 uopt->blocksize = option;
437 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
438 break;
439 case Opt_unhide:
440 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
441 break;
442 case Opt_undelete:
443 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
444 break;
445 case Opt_noadinicb:
446 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
447 break;
448 case Opt_adinicb:
449 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
450 break;
451 case Opt_shortad:
452 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
453 break;
454 case Opt_longad:
455 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
456 break;
457 case Opt_gid:
458 if (match_int(args, &option))
459 return 0;
460 uopt->gid = option;
461 uopt->flags |= (1 << UDF_FLAG_GID_SET);
462 break;
463 case Opt_uid:
464 if (match_int(args, &option))
465 return 0;
466 uopt->uid = option;
467 uopt->flags |= (1 << UDF_FLAG_UID_SET);
468 break;
469 case Opt_umask:
470 if (match_octal(args, &option))
471 return 0;
472 uopt->umask = option;
473 break;
474 case Opt_nostrict:
475 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
476 break;
477 case Opt_session:
478 if (match_int(args, &option))
479 return 0;
480 uopt->session = option;
481 if (!remount)
482 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
483 break;
484 case Opt_lastblock:
485 if (match_int(args, &option))
486 return 0;
487 uopt->lastblock = option;
488 if (!remount)
489 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
490 break;
491 case Opt_anchor:
492 if (match_int(args, &option))
493 return 0;
494 uopt->anchor = option;
495 break;
496 case Opt_volume:
497 if (match_int(args, &option))
498 return 0;
499 uopt->volume = option;
500 break;
501 case Opt_partition:
502 if (match_int(args, &option))
503 return 0;
504 uopt->partition = option;
505 break;
506 case Opt_fileset:
507 if (match_int(args, &option))
508 return 0;
509 uopt->fileset = option;
510 break;
511 case Opt_rootdir:
512 if (match_int(args, &option))
513 return 0;
514 uopt->rootdir = option;
515 break;
516 case Opt_utf8:
517 uopt->flags |= (1 << UDF_FLAG_UTF8);
518 break;
519 #ifdef CONFIG_UDF_NLS
520 case Opt_iocharset:
521 uopt->nls_map = load_nls(args[0].from);
522 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
523 break;
524 #endif
525 case Opt_uignore:
526 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
527 break;
528 case Opt_uforget:
529 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
530 break;
531 case Opt_gignore:
532 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
533 break;
534 case Opt_gforget:
535 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
536 break;
537 case Opt_fmode:
538 if (match_octal(args, &option))
539 return 0;
540 uopt->fmode = option & 0777;
541 break;
542 case Opt_dmode:
543 if (match_octal(args, &option))
544 return 0;
545 uopt->dmode = option & 0777;
546 break;
547 default:
548 printk(KERN_ERR "udf: bad mount option \"%s\" "
549 "or missing value\n", p);
550 return 0;
551 }
552 }
553 return 1;
554 }
555
556 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
557 {
558 struct udf_options uopt;
559 struct udf_sb_info *sbi = UDF_SB(sb);
560
561 uopt.flags = sbi->s_flags;
562 uopt.uid = sbi->s_uid;
563 uopt.gid = sbi->s_gid;
564 uopt.umask = sbi->s_umask;
565 uopt.fmode = sbi->s_fmode;
566 uopt.dmode = sbi->s_dmode;
567
568 if (!udf_parse_options(options, &uopt, true))
569 return -EINVAL;
570
571 lock_kernel();
572 sbi->s_flags = uopt.flags;
573 sbi->s_uid = uopt.uid;
574 sbi->s_gid = uopt.gid;
575 sbi->s_umask = uopt.umask;
576 sbi->s_fmode = uopt.fmode;
577 sbi->s_dmode = uopt.dmode;
578
579 if (sbi->s_lvid_bh) {
580 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
581 if (write_rev > UDF_MAX_WRITE_VERSION)
582 *flags |= MS_RDONLY;
583 }
584
585 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
586 unlock_kernel();
587 return 0;
588 }
589 if (*flags & MS_RDONLY)
590 udf_close_lvid(sb);
591 else
592 udf_open_lvid(sb);
593
594 unlock_kernel();
595 return 0;
596 }
597
598 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
599 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
600 static loff_t udf_check_vsd(struct super_block *sb)
601 {
602 struct volStructDesc *vsd = NULL;
603 loff_t sector = 32768;
604 int sectorsize;
605 struct buffer_head *bh = NULL;
606 int nsr02 = 0;
607 int nsr03 = 0;
608 struct udf_sb_info *sbi;
609
610 sbi = UDF_SB(sb);
611 if (sb->s_blocksize < sizeof(struct volStructDesc))
612 sectorsize = sizeof(struct volStructDesc);
613 else
614 sectorsize = sb->s_blocksize;
615
616 sector += (sbi->s_session << sb->s_blocksize_bits);
617
618 udf_debug("Starting at sector %u (%ld byte sectors)\n",
619 (unsigned int)(sector >> sb->s_blocksize_bits),
620 sb->s_blocksize);
621 /* Process the sequence (if applicable) */
622 for (; !nsr02 && !nsr03; sector += sectorsize) {
623 /* Read a block */
624 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
625 if (!bh)
626 break;
627
628 /* Look for ISO descriptors */
629 vsd = (struct volStructDesc *)(bh->b_data +
630 (sector & (sb->s_blocksize - 1)));
631
632 if (vsd->stdIdent[0] == 0) {
633 brelse(bh);
634 break;
635 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
636 VSD_STD_ID_LEN)) {
637 switch (vsd->structType) {
638 case 0:
639 udf_debug("ISO9660 Boot Record found\n");
640 break;
641 case 1:
642 udf_debug("ISO9660 Primary Volume Descriptor "
643 "found\n");
644 break;
645 case 2:
646 udf_debug("ISO9660 Supplementary Volume "
647 "Descriptor found\n");
648 break;
649 case 3:
650 udf_debug("ISO9660 Volume Partition Descriptor "
651 "found\n");
652 break;
653 case 255:
654 udf_debug("ISO9660 Volume Descriptor Set "
655 "Terminator found\n");
656 break;
657 default:
658 udf_debug("ISO9660 VRS (%u) found\n",
659 vsd->structType);
660 break;
661 }
662 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
663 VSD_STD_ID_LEN))
664 ; /* nothing */
665 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
666 VSD_STD_ID_LEN)) {
667 brelse(bh);
668 break;
669 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
670 VSD_STD_ID_LEN))
671 nsr02 = sector;
672 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
673 VSD_STD_ID_LEN))
674 nsr03 = sector;
675 brelse(bh);
676 }
677
678 if (nsr03)
679 return nsr03;
680 else if (nsr02)
681 return nsr02;
682 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
683 return -1;
684 else
685 return 0;
686 }
687
688 static int udf_find_fileset(struct super_block *sb,
689 struct kernel_lb_addr *fileset,
690 struct kernel_lb_addr *root)
691 {
692 struct buffer_head *bh = NULL;
693 long lastblock;
694 uint16_t ident;
695 struct udf_sb_info *sbi;
696
697 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
698 fileset->partitionReferenceNum != 0xFFFF) {
699 bh = udf_read_ptagged(sb, fileset, 0, &ident);
700
701 if (!bh) {
702 return 1;
703 } else if (ident != TAG_IDENT_FSD) {
704 brelse(bh);
705 return 1;
706 }
707
708 }
709
710 sbi = UDF_SB(sb);
711 if (!bh) {
712 /* Search backwards through the partitions */
713 struct kernel_lb_addr newfileset;
714
715 /* --> cvg: FIXME - is it reasonable? */
716 return 1;
717
718 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
719 (newfileset.partitionReferenceNum != 0xFFFF &&
720 fileset->logicalBlockNum == 0xFFFFFFFF &&
721 fileset->partitionReferenceNum == 0xFFFF);
722 newfileset.partitionReferenceNum--) {
723 lastblock = sbi->s_partmaps
724 [newfileset.partitionReferenceNum]
725 .s_partition_len;
726 newfileset.logicalBlockNum = 0;
727
728 do {
729 bh = udf_read_ptagged(sb, &newfileset, 0,
730 &ident);
731 if (!bh) {
732 newfileset.logicalBlockNum++;
733 continue;
734 }
735
736 switch (ident) {
737 case TAG_IDENT_SBD:
738 {
739 struct spaceBitmapDesc *sp;
740 sp = (struct spaceBitmapDesc *)
741 bh->b_data;
742 newfileset.logicalBlockNum += 1 +
743 ((le32_to_cpu(sp->numOfBytes) +
744 sizeof(struct spaceBitmapDesc)
745 - 1) >> sb->s_blocksize_bits);
746 brelse(bh);
747 break;
748 }
749 case TAG_IDENT_FSD:
750 *fileset = newfileset;
751 break;
752 default:
753 newfileset.logicalBlockNum++;
754 brelse(bh);
755 bh = NULL;
756 break;
757 }
758 } while (newfileset.logicalBlockNum < lastblock &&
759 fileset->logicalBlockNum == 0xFFFFFFFF &&
760 fileset->partitionReferenceNum == 0xFFFF);
761 }
762 }
763
764 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
765 fileset->partitionReferenceNum != 0xFFFF) && bh) {
766 udf_debug("Fileset at block=%d, partition=%d\n",
767 fileset->logicalBlockNum,
768 fileset->partitionReferenceNum);
769
770 sbi->s_partition = fileset->partitionReferenceNum;
771 udf_load_fileset(sb, bh, root);
772 brelse(bh);
773 return 0;
774 }
775 return 1;
776 }
777
778 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
779 {
780 struct primaryVolDesc *pvoldesc;
781 struct ustr *instr, *outstr;
782 struct buffer_head *bh;
783 uint16_t ident;
784 int ret = 1;
785
786 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
787 if (!instr)
788 return 1;
789
790 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
791 if (!outstr)
792 goto out1;
793
794 bh = udf_read_tagged(sb, block, block, &ident);
795 if (!bh)
796 goto out2;
797
798 BUG_ON(ident != TAG_IDENT_PVD);
799
800 pvoldesc = (struct primaryVolDesc *)bh->b_data;
801
802 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
803 pvoldesc->recordingDateAndTime)) {
804 #ifdef UDFFS_DEBUG
805 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
806 udf_debug("recording time %04u/%02u/%02u"
807 " %02u:%02u (%x)\n",
808 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
809 ts->minute, le16_to_cpu(ts->typeAndTimezone));
810 #endif
811 }
812
813 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
814 if (udf_CS0toUTF8(outstr, instr)) {
815 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
816 outstr->u_len > 31 ? 31 : outstr->u_len);
817 udf_debug("volIdent[] = '%s'\n",
818 UDF_SB(sb)->s_volume_ident);
819 }
820
821 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
822 if (udf_CS0toUTF8(outstr, instr))
823 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
824
825 brelse(bh);
826 ret = 0;
827 out2:
828 kfree(outstr);
829 out1:
830 kfree(instr);
831 return ret;
832 }
833
834 static int udf_load_metadata_files(struct super_block *sb, int partition)
835 {
836 struct udf_sb_info *sbi = UDF_SB(sb);
837 struct udf_part_map *map;
838 struct udf_meta_data *mdata;
839 struct kernel_lb_addr addr;
840 int fe_error = 0;
841
842 map = &sbi->s_partmaps[partition];
843 mdata = &map->s_type_specific.s_metadata;
844
845 /* metadata address */
846 addr.logicalBlockNum = mdata->s_meta_file_loc;
847 addr.partitionReferenceNum = map->s_partition_num;
848
849 udf_debug("Metadata file location: block = %d part = %d\n",
850 addr.logicalBlockNum, addr.partitionReferenceNum);
851
852 mdata->s_metadata_fe = udf_iget(sb, &addr);
853
854 if (mdata->s_metadata_fe == NULL) {
855 udf_warning(sb, __func__, "metadata inode efe not found, "
856 "will try mirror inode.");
857 fe_error = 1;
858 } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
859 ICBTAG_FLAG_AD_SHORT) {
860 udf_warning(sb, __func__, "metadata inode efe does not have "
861 "short allocation descriptors!");
862 fe_error = 1;
863 iput(mdata->s_metadata_fe);
864 mdata->s_metadata_fe = NULL;
865 }
866
867 /* mirror file entry */
868 addr.logicalBlockNum = mdata->s_mirror_file_loc;
869 addr.partitionReferenceNum = map->s_partition_num;
870
871 udf_debug("Mirror metadata file location: block = %d part = %d\n",
872 addr.logicalBlockNum, addr.partitionReferenceNum);
873
874 mdata->s_mirror_fe = udf_iget(sb, &addr);
875
876 if (mdata->s_mirror_fe == NULL) {
877 if (fe_error) {
878 udf_error(sb, __func__, "mirror inode efe not found "
879 "and metadata inode is missing too, exiting...");
880 goto error_exit;
881 } else
882 udf_warning(sb, __func__, "mirror inode efe not found,"
883 " but metadata inode is OK");
884 } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
885 ICBTAG_FLAG_AD_SHORT) {
886 udf_warning(sb, __func__, "mirror inode efe does not have "
887 "short allocation descriptors!");
888 iput(mdata->s_mirror_fe);
889 mdata->s_mirror_fe = NULL;
890 if (fe_error)
891 goto error_exit;
892 }
893
894 /*
895 * bitmap file entry
896 * Note:
897 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
898 */
899 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
900 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
901 addr.partitionReferenceNum = map->s_partition_num;
902
903 udf_debug("Bitmap file location: block = %d part = %d\n",
904 addr.logicalBlockNum, addr.partitionReferenceNum);
905
906 mdata->s_bitmap_fe = udf_iget(sb, &addr);
907
908 if (mdata->s_bitmap_fe == NULL) {
909 if (sb->s_flags & MS_RDONLY)
910 udf_warning(sb, __func__, "bitmap inode efe "
911 "not found but it's ok since the disc"
912 " is mounted read-only");
913 else {
914 udf_error(sb, __func__, "bitmap inode efe not "
915 "found and attempted read-write mount");
916 goto error_exit;
917 }
918 }
919 }
920
921 udf_debug("udf_load_metadata_files Ok\n");
922
923 return 0;
924
925 error_exit:
926 return 1;
927 }
928
929 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
930 struct kernel_lb_addr *root)
931 {
932 struct fileSetDesc *fset;
933
934 fset = (struct fileSetDesc *)bh->b_data;
935
936 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
937
938 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
939
940 udf_debug("Rootdir at block=%d, partition=%d\n",
941 root->logicalBlockNum, root->partitionReferenceNum);
942 }
943
944 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
945 {
946 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
947 return DIV_ROUND_UP(map->s_partition_len +
948 (sizeof(struct spaceBitmapDesc) << 3),
949 sb->s_blocksize * 8);
950 }
951
952 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
953 {
954 struct udf_bitmap *bitmap;
955 int nr_groups;
956 int size;
957
958 nr_groups = udf_compute_nr_groups(sb, index);
959 size = sizeof(struct udf_bitmap) +
960 (sizeof(struct buffer_head *) * nr_groups);
961
962 if (size <= PAGE_SIZE)
963 bitmap = kmalloc(size, GFP_KERNEL);
964 else
965 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
966
967 if (bitmap == NULL) {
968 udf_error(sb, __func__,
969 "Unable to allocate space for bitmap "
970 "and %d buffer_head pointers", nr_groups);
971 return NULL;
972 }
973
974 memset(bitmap, 0x00, size);
975 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
976 bitmap->s_nr_groups = nr_groups;
977 return bitmap;
978 }
979
980 static int udf_fill_partdesc_info(struct super_block *sb,
981 struct partitionDesc *p, int p_index)
982 {
983 struct udf_part_map *map;
984 struct udf_sb_info *sbi = UDF_SB(sb);
985 struct partitionHeaderDesc *phd;
986
987 map = &sbi->s_partmaps[p_index];
988
989 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
990 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
991
992 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
993 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
994 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
995 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
996 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
997 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
998 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
999 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1000
1001 udf_debug("Partition (%d type %x) starts at physical %d, "
1002 "block length %d\n", p_index,
1003 map->s_partition_type, map->s_partition_root,
1004 map->s_partition_len);
1005
1006 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1007 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1008 return 0;
1009
1010 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1011 if (phd->unallocSpaceTable.extLength) {
1012 struct kernel_lb_addr loc = {
1013 .logicalBlockNum = le32_to_cpu(
1014 phd->unallocSpaceTable.extPosition),
1015 .partitionReferenceNum = p_index,
1016 };
1017
1018 map->s_uspace.s_table = udf_iget(sb, &loc);
1019 if (!map->s_uspace.s_table) {
1020 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1021 p_index);
1022 return 1;
1023 }
1024 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1025 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1026 p_index, map->s_uspace.s_table->i_ino);
1027 }
1028
1029 if (phd->unallocSpaceBitmap.extLength) {
1030 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1031 if (!bitmap)
1032 return 1;
1033 map->s_uspace.s_bitmap = bitmap;
1034 bitmap->s_extLength = le32_to_cpu(
1035 phd->unallocSpaceBitmap.extLength);
1036 bitmap->s_extPosition = le32_to_cpu(
1037 phd->unallocSpaceBitmap.extPosition);
1038 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1039 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1040 bitmap->s_extPosition);
1041 }
1042
1043 if (phd->partitionIntegrityTable.extLength)
1044 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1045
1046 if (phd->freedSpaceTable.extLength) {
1047 struct kernel_lb_addr loc = {
1048 .logicalBlockNum = le32_to_cpu(
1049 phd->freedSpaceTable.extPosition),
1050 .partitionReferenceNum = p_index,
1051 };
1052
1053 map->s_fspace.s_table = udf_iget(sb, &loc);
1054 if (!map->s_fspace.s_table) {
1055 udf_debug("cannot load freedSpaceTable (part %d)\n",
1056 p_index);
1057 return 1;
1058 }
1059
1060 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1061 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1062 p_index, map->s_fspace.s_table->i_ino);
1063 }
1064
1065 if (phd->freedSpaceBitmap.extLength) {
1066 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1067 if (!bitmap)
1068 return 1;
1069 map->s_fspace.s_bitmap = bitmap;
1070 bitmap->s_extLength = le32_to_cpu(
1071 phd->freedSpaceBitmap.extLength);
1072 bitmap->s_extPosition = le32_to_cpu(
1073 phd->freedSpaceBitmap.extPosition);
1074 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1075 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1076 bitmap->s_extPosition);
1077 }
1078 return 0;
1079 }
1080
1081 static void udf_find_vat_block(struct super_block *sb, int p_index,
1082 int type1_index, sector_t start_block)
1083 {
1084 struct udf_sb_info *sbi = UDF_SB(sb);
1085 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1086 sector_t vat_block;
1087 struct kernel_lb_addr ino;
1088
1089 /*
1090 * VAT file entry is in the last recorded block. Some broken disks have
1091 * it a few blocks before so try a bit harder...
1092 */
1093 ino.partitionReferenceNum = type1_index;
1094 for (vat_block = start_block;
1095 vat_block >= map->s_partition_root &&
1096 vat_block >= start_block - 3 &&
1097 !sbi->s_vat_inode; vat_block--) {
1098 ino.logicalBlockNum = vat_block - map->s_partition_root;
1099 sbi->s_vat_inode = udf_iget(sb, &ino);
1100 }
1101 }
1102
1103 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1104 {
1105 struct udf_sb_info *sbi = UDF_SB(sb);
1106 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1107 struct buffer_head *bh = NULL;
1108 struct udf_inode_info *vati;
1109 uint32_t pos;
1110 struct virtualAllocationTable20 *vat20;
1111 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1112
1113 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1114 if (!sbi->s_vat_inode &&
1115 sbi->s_last_block != blocks - 1) {
1116 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1117 " last recorded block (%lu), retrying with the last "
1118 "block of the device (%lu).\n",
1119 (unsigned long)sbi->s_last_block,
1120 (unsigned long)blocks - 1);
1121 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1122 }
1123 if (!sbi->s_vat_inode)
1124 return 1;
1125
1126 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1127 map->s_type_specific.s_virtual.s_start_offset = 0;
1128 map->s_type_specific.s_virtual.s_num_entries =
1129 (sbi->s_vat_inode->i_size - 36) >> 2;
1130 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1131 vati = UDF_I(sbi->s_vat_inode);
1132 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1133 pos = udf_block_map(sbi->s_vat_inode, 0);
1134 bh = sb_bread(sb, pos);
1135 if (!bh)
1136 return 1;
1137 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1138 } else {
1139 vat20 = (struct virtualAllocationTable20 *)
1140 vati->i_ext.i_data;
1141 }
1142
1143 map->s_type_specific.s_virtual.s_start_offset =
1144 le16_to_cpu(vat20->lengthHeader);
1145 map->s_type_specific.s_virtual.s_num_entries =
1146 (sbi->s_vat_inode->i_size -
1147 map->s_type_specific.s_virtual.
1148 s_start_offset) >> 2;
1149 brelse(bh);
1150 }
1151 return 0;
1152 }
1153
1154 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1155 {
1156 struct buffer_head *bh;
1157 struct partitionDesc *p;
1158 struct udf_part_map *map;
1159 struct udf_sb_info *sbi = UDF_SB(sb);
1160 int i, type1_idx;
1161 uint16_t partitionNumber;
1162 uint16_t ident;
1163 int ret = 0;
1164
1165 bh = udf_read_tagged(sb, block, block, &ident);
1166 if (!bh)
1167 return 1;
1168 if (ident != TAG_IDENT_PD)
1169 goto out_bh;
1170
1171 p = (struct partitionDesc *)bh->b_data;
1172 partitionNumber = le16_to_cpu(p->partitionNumber);
1173
1174 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1175 for (i = 0; i < sbi->s_partitions; i++) {
1176 map = &sbi->s_partmaps[i];
1177 udf_debug("Searching map: (%d == %d)\n",
1178 map->s_partition_num, partitionNumber);
1179 if (map->s_partition_num == partitionNumber &&
1180 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1181 map->s_partition_type == UDF_SPARABLE_MAP15))
1182 break;
1183 }
1184
1185 if (i >= sbi->s_partitions) {
1186 udf_debug("Partition (%d) not found in partition map\n",
1187 partitionNumber);
1188 goto out_bh;
1189 }
1190
1191 ret = udf_fill_partdesc_info(sb, p, i);
1192
1193 /*
1194 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1195 * PHYSICAL partitions are already set up
1196 */
1197 type1_idx = i;
1198 for (i = 0; i < sbi->s_partitions; i++) {
1199 map = &sbi->s_partmaps[i];
1200
1201 if (map->s_partition_num == partitionNumber &&
1202 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1203 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1204 map->s_partition_type == UDF_METADATA_MAP25))
1205 break;
1206 }
1207
1208 if (i >= sbi->s_partitions)
1209 goto out_bh;
1210
1211 ret = udf_fill_partdesc_info(sb, p, i);
1212 if (ret)
1213 goto out_bh;
1214
1215 if (map->s_partition_type == UDF_METADATA_MAP25) {
1216 ret = udf_load_metadata_files(sb, i);
1217 if (ret) {
1218 printk(KERN_ERR "UDF-fs: error loading MetaData "
1219 "partition map %d\n", i);
1220 goto out_bh;
1221 }
1222 } else {
1223 ret = udf_load_vat(sb, i, type1_idx);
1224 if (ret)
1225 goto out_bh;
1226 /*
1227 * Mark filesystem read-only if we have a partition with
1228 * virtual map since we don't handle writing to it (we
1229 * overwrite blocks instead of relocating them).
1230 */
1231 sb->s_flags |= MS_RDONLY;
1232 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1233 "because writing to pseudooverwrite partition is "
1234 "not implemented.\n");
1235 }
1236 out_bh:
1237 /* In case loading failed, we handle cleanup in udf_fill_super */
1238 brelse(bh);
1239 return ret;
1240 }
1241
1242 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1243 struct kernel_lb_addr *fileset)
1244 {
1245 struct logicalVolDesc *lvd;
1246 int i, j, offset;
1247 uint8_t type;
1248 struct udf_sb_info *sbi = UDF_SB(sb);
1249 struct genericPartitionMap *gpm;
1250 uint16_t ident;
1251 struct buffer_head *bh;
1252 int ret = 0;
1253
1254 bh = udf_read_tagged(sb, block, block, &ident);
1255 if (!bh)
1256 return 1;
1257 BUG_ON(ident != TAG_IDENT_LVD);
1258 lvd = (struct logicalVolDesc *)bh->b_data;
1259
1260 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1261 if (i != 0) {
1262 ret = i;
1263 goto out_bh;
1264 }
1265
1266 for (i = 0, offset = 0;
1267 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1268 i++, offset += gpm->partitionMapLength) {
1269 struct udf_part_map *map = &sbi->s_partmaps[i];
1270 gpm = (struct genericPartitionMap *)
1271 &(lvd->partitionMaps[offset]);
1272 type = gpm->partitionMapType;
1273 if (type == 1) {
1274 struct genericPartitionMap1 *gpm1 =
1275 (struct genericPartitionMap1 *)gpm;
1276 map->s_partition_type = UDF_TYPE1_MAP15;
1277 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1278 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1279 map->s_partition_func = NULL;
1280 } else if (type == 2) {
1281 struct udfPartitionMap2 *upm2 =
1282 (struct udfPartitionMap2 *)gpm;
1283 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1284 strlen(UDF_ID_VIRTUAL))) {
1285 u16 suf =
1286 le16_to_cpu(((__le16 *)upm2->partIdent.
1287 identSuffix)[0]);
1288 if (suf < 0x0200) {
1289 map->s_partition_type =
1290 UDF_VIRTUAL_MAP15;
1291 map->s_partition_func =
1292 udf_get_pblock_virt15;
1293 } else {
1294 map->s_partition_type =
1295 UDF_VIRTUAL_MAP20;
1296 map->s_partition_func =
1297 udf_get_pblock_virt20;
1298 }
1299 } else if (!strncmp(upm2->partIdent.ident,
1300 UDF_ID_SPARABLE,
1301 strlen(UDF_ID_SPARABLE))) {
1302 uint32_t loc;
1303 struct sparingTable *st;
1304 struct sparablePartitionMap *spm =
1305 (struct sparablePartitionMap *)gpm;
1306
1307 map->s_partition_type = UDF_SPARABLE_MAP15;
1308 map->s_type_specific.s_sparing.s_packet_len =
1309 le16_to_cpu(spm->packetLength);
1310 for (j = 0; j < spm->numSparingTables; j++) {
1311 struct buffer_head *bh2;
1312
1313 loc = le32_to_cpu(
1314 spm->locSparingTable[j]);
1315 bh2 = udf_read_tagged(sb, loc, loc,
1316 &ident);
1317 map->s_type_specific.s_sparing.
1318 s_spar_map[j] = bh2;
1319
1320 if (bh2 == NULL)
1321 continue;
1322
1323 st = (struct sparingTable *)bh2->b_data;
1324 if (ident != 0 || strncmp(
1325 st->sparingIdent.ident,
1326 UDF_ID_SPARING,
1327 strlen(UDF_ID_SPARING))) {
1328 brelse(bh2);
1329 map->s_type_specific.s_sparing.
1330 s_spar_map[j] = NULL;
1331 }
1332 }
1333 map->s_partition_func = udf_get_pblock_spar15;
1334 } else if (!strncmp(upm2->partIdent.ident,
1335 UDF_ID_METADATA,
1336 strlen(UDF_ID_METADATA))) {
1337 struct udf_meta_data *mdata =
1338 &map->s_type_specific.s_metadata;
1339 struct metadataPartitionMap *mdm =
1340 (struct metadataPartitionMap *)
1341 &(lvd->partitionMaps[offset]);
1342 udf_debug("Parsing Logical vol part %d "
1343 "type %d id=%s\n", i, type,
1344 UDF_ID_METADATA);
1345
1346 map->s_partition_type = UDF_METADATA_MAP25;
1347 map->s_partition_func = udf_get_pblock_meta25;
1348
1349 mdata->s_meta_file_loc =
1350 le32_to_cpu(mdm->metadataFileLoc);
1351 mdata->s_mirror_file_loc =
1352 le32_to_cpu(mdm->metadataMirrorFileLoc);
1353 mdata->s_bitmap_file_loc =
1354 le32_to_cpu(mdm->metadataBitmapFileLoc);
1355 mdata->s_alloc_unit_size =
1356 le32_to_cpu(mdm->allocUnitSize);
1357 mdata->s_align_unit_size =
1358 le16_to_cpu(mdm->alignUnitSize);
1359 mdata->s_dup_md_flag =
1360 mdm->flags & 0x01;
1361
1362 udf_debug("Metadata Ident suffix=0x%x\n",
1363 (le16_to_cpu(
1364 ((__le16 *)
1365 mdm->partIdent.identSuffix)[0])));
1366 udf_debug("Metadata part num=%d\n",
1367 le16_to_cpu(mdm->partitionNum));
1368 udf_debug("Metadata part alloc unit size=%d\n",
1369 le32_to_cpu(mdm->allocUnitSize));
1370 udf_debug("Metadata file loc=%d\n",
1371 le32_to_cpu(mdm->metadataFileLoc));
1372 udf_debug("Mirror file loc=%d\n",
1373 le32_to_cpu(mdm->metadataMirrorFileLoc));
1374 udf_debug("Bitmap file loc=%d\n",
1375 le32_to_cpu(mdm->metadataBitmapFileLoc));
1376 udf_debug("Duplicate Flag: %d %d\n",
1377 mdata->s_dup_md_flag, mdm->flags);
1378 } else {
1379 udf_debug("Unknown ident: %s\n",
1380 upm2->partIdent.ident);
1381 continue;
1382 }
1383 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1384 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1385 }
1386 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1387 i, map->s_partition_num, type,
1388 map->s_volumeseqnum);
1389 }
1390
1391 if (fileset) {
1392 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1393
1394 *fileset = lelb_to_cpu(la->extLocation);
1395 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1396 "partition=%d\n", fileset->logicalBlockNum,
1397 fileset->partitionReferenceNum);
1398 }
1399 if (lvd->integritySeqExt.extLength)
1400 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1401
1402 out_bh:
1403 brelse(bh);
1404 return ret;
1405 }
1406
1407 /*
1408 * udf_load_logicalvolint
1409 *
1410 */
1411 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1412 {
1413 struct buffer_head *bh = NULL;
1414 uint16_t ident;
1415 struct udf_sb_info *sbi = UDF_SB(sb);
1416 struct logicalVolIntegrityDesc *lvid;
1417
1418 while (loc.extLength > 0 &&
1419 (bh = udf_read_tagged(sb, loc.extLocation,
1420 loc.extLocation, &ident)) &&
1421 ident == TAG_IDENT_LVID) {
1422 sbi->s_lvid_bh = bh;
1423 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1424
1425 if (lvid->nextIntegrityExt.extLength)
1426 udf_load_logicalvolint(sb,
1427 leea_to_cpu(lvid->nextIntegrityExt));
1428
1429 if (sbi->s_lvid_bh != bh)
1430 brelse(bh);
1431 loc.extLength -= sb->s_blocksize;
1432 loc.extLocation++;
1433 }
1434 if (sbi->s_lvid_bh != bh)
1435 brelse(bh);
1436 }
1437
1438 /*
1439 * udf_process_sequence
1440 *
1441 * PURPOSE
1442 * Process a main/reserve volume descriptor sequence.
1443 *
1444 * PRE-CONDITIONS
1445 * sb Pointer to _locked_ superblock.
1446 * block First block of first extent of the sequence.
1447 * lastblock Lastblock of first extent of the sequence.
1448 *
1449 * HISTORY
1450 * July 1, 1997 - Andrew E. Mileski
1451 * Written, tested, and released.
1452 */
1453 static noinline int udf_process_sequence(struct super_block *sb, long block,
1454 long lastblock, struct kernel_lb_addr *fileset)
1455 {
1456 struct buffer_head *bh = NULL;
1457 struct udf_vds_record vds[VDS_POS_LENGTH];
1458 struct udf_vds_record *curr;
1459 struct generic_desc *gd;
1460 struct volDescPtr *vdp;
1461 int done = 0;
1462 uint32_t vdsn;
1463 uint16_t ident;
1464 long next_s = 0, next_e = 0;
1465
1466 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1467
1468 /*
1469 * Read the main descriptor sequence and find which descriptors
1470 * are in it.
1471 */
1472 for (; (!done && block <= lastblock); block++) {
1473
1474 bh = udf_read_tagged(sb, block, block, &ident);
1475 if (!bh) {
1476 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1477 "sequence is corrupted or we could not read "
1478 "it.\n", (unsigned long long)block);
1479 return 1;
1480 }
1481
1482 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1483 gd = (struct generic_desc *)bh->b_data;
1484 vdsn = le32_to_cpu(gd->volDescSeqNum);
1485 switch (ident) {
1486 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1487 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1488 if (vdsn >= curr->volDescSeqNum) {
1489 curr->volDescSeqNum = vdsn;
1490 curr->block = block;
1491 }
1492 break;
1493 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1494 curr = &vds[VDS_POS_VOL_DESC_PTR];
1495 if (vdsn >= curr->volDescSeqNum) {
1496 curr->volDescSeqNum = vdsn;
1497 curr->block = block;
1498
1499 vdp = (struct volDescPtr *)bh->b_data;
1500 next_s = le32_to_cpu(
1501 vdp->nextVolDescSeqExt.extLocation);
1502 next_e = le32_to_cpu(
1503 vdp->nextVolDescSeqExt.extLength);
1504 next_e = next_e >> sb->s_blocksize_bits;
1505 next_e += next_s;
1506 }
1507 break;
1508 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1509 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1510 if (vdsn >= curr->volDescSeqNum) {
1511 curr->volDescSeqNum = vdsn;
1512 curr->block = block;
1513 }
1514 break;
1515 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1516 curr = &vds[VDS_POS_PARTITION_DESC];
1517 if (!curr->block)
1518 curr->block = block;
1519 break;
1520 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1521 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1522 if (vdsn >= curr->volDescSeqNum) {
1523 curr->volDescSeqNum = vdsn;
1524 curr->block = block;
1525 }
1526 break;
1527 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1528 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1529 if (vdsn >= curr->volDescSeqNum) {
1530 curr->volDescSeqNum = vdsn;
1531 curr->block = block;
1532 }
1533 break;
1534 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1535 vds[VDS_POS_TERMINATING_DESC].block = block;
1536 if (next_e) {
1537 block = next_s;
1538 lastblock = next_e;
1539 next_s = next_e = 0;
1540 } else
1541 done = 1;
1542 break;
1543 }
1544 brelse(bh);
1545 }
1546 /*
1547 * Now read interesting descriptors again and process them
1548 * in a suitable order
1549 */
1550 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1551 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1552 return 1;
1553 }
1554 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1555 return 1;
1556
1557 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1558 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1559 return 1;
1560
1561 if (vds[VDS_POS_PARTITION_DESC].block) {
1562 /*
1563 * We rescan the whole descriptor sequence to find
1564 * partition descriptor blocks and process them.
1565 */
1566 for (block = vds[VDS_POS_PARTITION_DESC].block;
1567 block < vds[VDS_POS_TERMINATING_DESC].block;
1568 block++)
1569 if (udf_load_partdesc(sb, block))
1570 return 1;
1571 }
1572
1573 return 0;
1574 }
1575
1576 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1577 struct kernel_lb_addr *fileset)
1578 {
1579 struct anchorVolDescPtr *anchor;
1580 long main_s, main_e, reserve_s, reserve_e;
1581 struct udf_sb_info *sbi;
1582
1583 sbi = UDF_SB(sb);
1584 anchor = (struct anchorVolDescPtr *)bh->b_data;
1585
1586 /* Locate the main sequence */
1587 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1588 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1589 main_e = main_e >> sb->s_blocksize_bits;
1590 main_e += main_s;
1591
1592 /* Locate the reserve sequence */
1593 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1594 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1595 reserve_e = reserve_e >> sb->s_blocksize_bits;
1596 reserve_e += reserve_s;
1597
1598 /* Process the main & reserve sequences */
1599 /* responsible for finding the PartitionDesc(s) */
1600 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1601 return 1;
1602 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1603 }
1604
1605 /*
1606 * Check whether there is an anchor block in the given block and
1607 * load Volume Descriptor Sequence if so.
1608 */
1609 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1610 struct kernel_lb_addr *fileset)
1611 {
1612 struct buffer_head *bh;
1613 uint16_t ident;
1614 int ret;
1615
1616 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1617 udf_fixed_to_variable(block) >=
1618 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1619 return 0;
1620
1621 bh = udf_read_tagged(sb, block, block, &ident);
1622 if (!bh)
1623 return 0;
1624 if (ident != TAG_IDENT_AVDP) {
1625 brelse(bh);
1626 return 0;
1627 }
1628 ret = udf_load_sequence(sb, bh, fileset);
1629 brelse(bh);
1630 return ret;
1631 }
1632
1633 /* Search for an anchor volume descriptor pointer */
1634 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1635 struct kernel_lb_addr *fileset)
1636 {
1637 sector_t last[6];
1638 int i;
1639 struct udf_sb_info *sbi = UDF_SB(sb);
1640 int last_count = 0;
1641
1642 /* First try user provided anchor */
1643 if (sbi->s_anchor) {
1644 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1645 return lastblock;
1646 }
1647 /*
1648 * according to spec, anchor is in either:
1649 * block 256
1650 * lastblock-256
1651 * lastblock
1652 * however, if the disc isn't closed, it could be 512.
1653 */
1654 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1655 return lastblock;
1656 /*
1657 * The trouble is which block is the last one. Drives often misreport
1658 * this so we try various possibilities.
1659 */
1660 last[last_count++] = lastblock;
1661 if (lastblock >= 1)
1662 last[last_count++] = lastblock - 1;
1663 last[last_count++] = lastblock + 1;
1664 if (lastblock >= 2)
1665 last[last_count++] = lastblock - 2;
1666 if (lastblock >= 150)
1667 last[last_count++] = lastblock - 150;
1668 if (lastblock >= 152)
1669 last[last_count++] = lastblock - 152;
1670
1671 for (i = 0; i < last_count; i++) {
1672 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1673 sb->s_blocksize_bits)
1674 continue;
1675 if (udf_check_anchor_block(sb, last[i], fileset))
1676 return last[i];
1677 if (last[i] < 256)
1678 continue;
1679 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1680 return last[i];
1681 }
1682
1683 /* Finally try block 512 in case media is open */
1684 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1685 return last[0];
1686 return 0;
1687 }
1688
1689 /*
1690 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1691 * area specified by it. The function expects sbi->s_lastblock to be the last
1692 * block on the media.
1693 *
1694 * Return 1 if ok, 0 if not found.
1695 *
1696 */
1697 static int udf_find_anchor(struct super_block *sb,
1698 struct kernel_lb_addr *fileset)
1699 {
1700 sector_t lastblock;
1701 struct udf_sb_info *sbi = UDF_SB(sb);
1702
1703 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1704 if (lastblock)
1705 goto out;
1706
1707 /* No anchor found? Try VARCONV conversion of block numbers */
1708 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1709 /* Firstly, we try to not convert number of the last block */
1710 lastblock = udf_scan_anchors(sb,
1711 udf_variable_to_fixed(sbi->s_last_block),
1712 fileset);
1713 if (lastblock)
1714 goto out;
1715
1716 /* Secondly, we try with converted number of the last block */
1717 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1718 if (!lastblock) {
1719 /* VARCONV didn't help. Clear it. */
1720 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1721 return 0;
1722 }
1723 out:
1724 sbi->s_last_block = lastblock;
1725 return 1;
1726 }
1727
1728 /*
1729 * Check Volume Structure Descriptor, find Anchor block and load Volume
1730 * Descriptor Sequence
1731 */
1732 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1733 int silent, struct kernel_lb_addr *fileset)
1734 {
1735 struct udf_sb_info *sbi = UDF_SB(sb);
1736 loff_t nsr_off;
1737
1738 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1739 if (!silent)
1740 printk(KERN_WARNING "UDF-fs: Bad block size\n");
1741 return 0;
1742 }
1743 sbi->s_last_block = uopt->lastblock;
1744 if (!uopt->novrs) {
1745 /* Check that it is NSR02 compliant */
1746 nsr_off = udf_check_vsd(sb);
1747 if (!nsr_off) {
1748 if (!silent)
1749 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1750 return 0;
1751 }
1752 if (nsr_off == -1)
1753 udf_debug("Failed to read byte 32768. Assuming open "
1754 "disc. Skipping validity check\n");
1755 if (!sbi->s_last_block)
1756 sbi->s_last_block = udf_get_last_block(sb);
1757 } else {
1758 udf_debug("Validity check skipped because of novrs option\n");
1759 }
1760
1761 /* Look for anchor block and load Volume Descriptor Sequence */
1762 sbi->s_anchor = uopt->anchor;
1763 if (!udf_find_anchor(sb, fileset)) {
1764 if (!silent)
1765 printk(KERN_WARNING "UDF-fs: No anchor found\n");
1766 return 0;
1767 }
1768 return 1;
1769 }
1770
1771 static void udf_open_lvid(struct super_block *sb)
1772 {
1773 struct udf_sb_info *sbi = UDF_SB(sb);
1774 struct buffer_head *bh = sbi->s_lvid_bh;
1775 struct logicalVolIntegrityDesc *lvid;
1776 struct logicalVolIntegrityDescImpUse *lvidiu;
1777
1778 if (!bh)
1779 return;
1780 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1781 lvidiu = udf_sb_lvidiu(sbi);
1782
1783 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1784 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1785 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1786 CURRENT_TIME);
1787 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1788
1789 lvid->descTag.descCRC = cpu_to_le16(
1790 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1791 le16_to_cpu(lvid->descTag.descCRCLength)));
1792
1793 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1794 mark_buffer_dirty(bh);
1795 sbi->s_lvid_dirty = 0;
1796 }
1797
1798 static void udf_close_lvid(struct super_block *sb)
1799 {
1800 struct udf_sb_info *sbi = UDF_SB(sb);
1801 struct buffer_head *bh = sbi->s_lvid_bh;
1802 struct logicalVolIntegrityDesc *lvid;
1803 struct logicalVolIntegrityDescImpUse *lvidiu;
1804
1805 if (!bh)
1806 return;
1807
1808 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1809 lvidiu = udf_sb_lvidiu(sbi);
1810 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1811 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1812 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1813 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1814 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1815 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1816 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1817 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1818 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1819 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1820
1821 lvid->descTag.descCRC = cpu_to_le16(
1822 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1823 le16_to_cpu(lvid->descTag.descCRCLength)));
1824
1825 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1826 mark_buffer_dirty(bh);
1827 sbi->s_lvid_dirty = 0;
1828 }
1829
1830 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1831 {
1832 int i;
1833 int nr_groups = bitmap->s_nr_groups;
1834 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1835 nr_groups);
1836
1837 for (i = 0; i < nr_groups; i++)
1838 if (bitmap->s_block_bitmap[i])
1839 brelse(bitmap->s_block_bitmap[i]);
1840
1841 if (size <= PAGE_SIZE)
1842 kfree(bitmap);
1843 else
1844 vfree(bitmap);
1845 }
1846
1847 static void udf_free_partition(struct udf_part_map *map)
1848 {
1849 int i;
1850 struct udf_meta_data *mdata;
1851
1852 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1853 iput(map->s_uspace.s_table);
1854 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1855 iput(map->s_fspace.s_table);
1856 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1857 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1858 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1859 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1860 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1861 for (i = 0; i < 4; i++)
1862 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1863 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1864 mdata = &map->s_type_specific.s_metadata;
1865 iput(mdata->s_metadata_fe);
1866 mdata->s_metadata_fe = NULL;
1867
1868 iput(mdata->s_mirror_fe);
1869 mdata->s_mirror_fe = NULL;
1870
1871 iput(mdata->s_bitmap_fe);
1872 mdata->s_bitmap_fe = NULL;
1873 }
1874 }
1875
1876 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1877 {
1878 int i;
1879 int ret;
1880 struct inode *inode = NULL;
1881 struct udf_options uopt;
1882 struct kernel_lb_addr rootdir, fileset;
1883 struct udf_sb_info *sbi;
1884
1885 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1886 uopt.uid = -1;
1887 uopt.gid = -1;
1888 uopt.umask = 0;
1889 uopt.fmode = UDF_INVALID_MODE;
1890 uopt.dmode = UDF_INVALID_MODE;
1891
1892 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1893 if (!sbi)
1894 return -ENOMEM;
1895
1896 sb->s_fs_info = sbi;
1897
1898 mutex_init(&sbi->s_alloc_mutex);
1899
1900 if (!udf_parse_options((char *)options, &uopt, false))
1901 goto error_out;
1902
1903 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1904 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1905 udf_error(sb, "udf_read_super",
1906 "utf8 cannot be combined with iocharset\n");
1907 goto error_out;
1908 }
1909 #ifdef CONFIG_UDF_NLS
1910 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1911 uopt.nls_map = load_nls_default();
1912 if (!uopt.nls_map)
1913 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1914 else
1915 udf_debug("Using default NLS map\n");
1916 }
1917 #endif
1918 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1919 uopt.flags |= (1 << UDF_FLAG_UTF8);
1920
1921 fileset.logicalBlockNum = 0xFFFFFFFF;
1922 fileset.partitionReferenceNum = 0xFFFF;
1923
1924 sbi->s_flags = uopt.flags;
1925 sbi->s_uid = uopt.uid;
1926 sbi->s_gid = uopt.gid;
1927 sbi->s_umask = uopt.umask;
1928 sbi->s_fmode = uopt.fmode;
1929 sbi->s_dmode = uopt.dmode;
1930 sbi->s_nls_map = uopt.nls_map;
1931
1932 if (uopt.session == 0xFFFFFFFF)
1933 sbi->s_session = udf_get_last_session(sb);
1934 else
1935 sbi->s_session = uopt.session;
1936
1937 udf_debug("Multi-session=%d\n", sbi->s_session);
1938
1939 /* Fill in the rest of the superblock */
1940 sb->s_op = &udf_sb_ops;
1941 sb->s_export_op = &udf_export_ops;
1942 sb->dq_op = NULL;
1943 sb->s_dirt = 0;
1944 sb->s_magic = UDF_SUPER_MAGIC;
1945 sb->s_time_gran = 1000;
1946
1947 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1948 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1949 } else {
1950 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1951 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1952 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1953 if (!silent)
1954 printk(KERN_NOTICE
1955 "UDF-fs: Rescanning with blocksize "
1956 "%d\n", UDF_DEFAULT_BLOCKSIZE);
1957 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1958 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1959 }
1960 }
1961 if (!ret) {
1962 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1963 goto error_out;
1964 }
1965
1966 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1967
1968 if (sbi->s_lvid_bh) {
1969 struct logicalVolIntegrityDescImpUse *lvidiu =
1970 udf_sb_lvidiu(sbi);
1971 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1972 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1973 /* uint16_t maxUDFWriteRev =
1974 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1975
1976 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1977 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1978 "(max is %x)\n",
1979 le16_to_cpu(lvidiu->minUDFReadRev),
1980 UDF_MAX_READ_VERSION);
1981 goto error_out;
1982 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1983 sb->s_flags |= MS_RDONLY;
1984
1985 sbi->s_udfrev = minUDFWriteRev;
1986
1987 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1988 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1989 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1990 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1991 }
1992
1993 if (!sbi->s_partitions) {
1994 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1995 goto error_out;
1996 }
1997
1998 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1999 UDF_PART_FLAG_READ_ONLY) {
2000 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2001 "forcing readonly mount\n");
2002 sb->s_flags |= MS_RDONLY;
2003 }
2004
2005 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2006 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2007 goto error_out;
2008 }
2009
2010 if (!silent) {
2011 struct timestamp ts;
2012 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2013 udf_info("UDF: Mounting volume '%s', "
2014 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2015 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2016 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2017 }
2018 if (!(sb->s_flags & MS_RDONLY))
2019 udf_open_lvid(sb);
2020
2021 /* Assign the root inode */
2022 /* assign inodes by physical block number */
2023 /* perhaps it's not extensible enough, but for now ... */
2024 inode = udf_iget(sb, &rootdir);
2025 if (!inode) {
2026 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2027 "partition=%d\n",
2028 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2029 goto error_out;
2030 }
2031
2032 /* Allocate a dentry for the root inode */
2033 sb->s_root = d_alloc_root(inode);
2034 if (!sb->s_root) {
2035 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2036 iput(inode);
2037 goto error_out;
2038 }
2039 sb->s_maxbytes = MAX_LFS_FILESIZE;
2040 return 0;
2041
2042 error_out:
2043 if (sbi->s_vat_inode)
2044 iput(sbi->s_vat_inode);
2045 if (sbi->s_partitions)
2046 for (i = 0; i < sbi->s_partitions; i++)
2047 udf_free_partition(&sbi->s_partmaps[i]);
2048 #ifdef CONFIG_UDF_NLS
2049 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2050 unload_nls(sbi->s_nls_map);
2051 #endif
2052 if (!(sb->s_flags & MS_RDONLY))
2053 udf_close_lvid(sb);
2054 brelse(sbi->s_lvid_bh);
2055
2056 kfree(sbi->s_partmaps);
2057 kfree(sbi);
2058 sb->s_fs_info = NULL;
2059
2060 return -EINVAL;
2061 }
2062
2063 static void udf_error(struct super_block *sb, const char *function,
2064 const char *fmt, ...)
2065 {
2066 va_list args;
2067
2068 if (!(sb->s_flags & MS_RDONLY)) {
2069 /* mark sb error */
2070 sb->s_dirt = 1;
2071 }
2072 va_start(args, fmt);
2073 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2074 va_end(args);
2075 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2076 sb->s_id, function, error_buf);
2077 }
2078
2079 void udf_warning(struct super_block *sb, const char *function,
2080 const char *fmt, ...)
2081 {
2082 va_list args;
2083
2084 va_start(args, fmt);
2085 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2086 va_end(args);
2087 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2088 sb->s_id, function, error_buf);
2089 }
2090
2091 static void udf_put_super(struct super_block *sb)
2092 {
2093 int i;
2094 struct udf_sb_info *sbi;
2095
2096 sbi = UDF_SB(sb);
2097
2098 lock_kernel();
2099
2100 if (sbi->s_vat_inode)
2101 iput(sbi->s_vat_inode);
2102 if (sbi->s_partitions)
2103 for (i = 0; i < sbi->s_partitions; i++)
2104 udf_free_partition(&sbi->s_partmaps[i]);
2105 #ifdef CONFIG_UDF_NLS
2106 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2107 unload_nls(sbi->s_nls_map);
2108 #endif
2109 if (!(sb->s_flags & MS_RDONLY))
2110 udf_close_lvid(sb);
2111 brelse(sbi->s_lvid_bh);
2112 kfree(sbi->s_partmaps);
2113 kfree(sb->s_fs_info);
2114 sb->s_fs_info = NULL;
2115
2116 unlock_kernel();
2117 }
2118
2119 static int udf_sync_fs(struct super_block *sb, int wait)
2120 {
2121 struct udf_sb_info *sbi = UDF_SB(sb);
2122
2123 mutex_lock(&sbi->s_alloc_mutex);
2124 if (sbi->s_lvid_dirty) {
2125 /*
2126 * Blockdevice will be synced later so we don't have to submit
2127 * the buffer for IO
2128 */
2129 mark_buffer_dirty(sbi->s_lvid_bh);
2130 sb->s_dirt = 0;
2131 sbi->s_lvid_dirty = 0;
2132 }
2133 mutex_unlock(&sbi->s_alloc_mutex);
2134
2135 return 0;
2136 }
2137
2138 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2139 {
2140 struct super_block *sb = dentry->d_sb;
2141 struct udf_sb_info *sbi = UDF_SB(sb);
2142 struct logicalVolIntegrityDescImpUse *lvidiu;
2143 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2144
2145 if (sbi->s_lvid_bh != NULL)
2146 lvidiu = udf_sb_lvidiu(sbi);
2147 else
2148 lvidiu = NULL;
2149
2150 buf->f_type = UDF_SUPER_MAGIC;
2151 buf->f_bsize = sb->s_blocksize;
2152 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2153 buf->f_bfree = udf_count_free(sb);
2154 buf->f_bavail = buf->f_bfree;
2155 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2156 le32_to_cpu(lvidiu->numDirs)) : 0)
2157 + buf->f_bfree;
2158 buf->f_ffree = buf->f_bfree;
2159 buf->f_namelen = UDF_NAME_LEN - 2;
2160 buf->f_fsid.val[0] = (u32)id;
2161 buf->f_fsid.val[1] = (u32)(id >> 32);
2162
2163 return 0;
2164 }
2165
2166 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2167 struct udf_bitmap *bitmap)
2168 {
2169 struct buffer_head *bh = NULL;
2170 unsigned int accum = 0;
2171 int index;
2172 int block = 0, newblock;
2173 struct kernel_lb_addr loc;
2174 uint32_t bytes;
2175 uint8_t *ptr;
2176 uint16_t ident;
2177 struct spaceBitmapDesc *bm;
2178
2179 lock_kernel();
2180
2181 loc.logicalBlockNum = bitmap->s_extPosition;
2182 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2183 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2184
2185 if (!bh) {
2186 printk(KERN_ERR "udf: udf_count_free failed\n");
2187 goto out;
2188 } else if (ident != TAG_IDENT_SBD) {
2189 brelse(bh);
2190 printk(KERN_ERR "udf: udf_count_free failed\n");
2191 goto out;
2192 }
2193
2194 bm = (struct spaceBitmapDesc *)bh->b_data;
2195 bytes = le32_to_cpu(bm->numOfBytes);
2196 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2197 ptr = (uint8_t *)bh->b_data;
2198
2199 while (bytes > 0) {
2200 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2201 accum += bitmap_weight((const unsigned long *)(ptr + index),
2202 cur_bytes * 8);
2203 bytes -= cur_bytes;
2204 if (bytes) {
2205 brelse(bh);
2206 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2207 bh = udf_tread(sb, newblock);
2208 if (!bh) {
2209 udf_debug("read failed\n");
2210 goto out;
2211 }
2212 index = 0;
2213 ptr = (uint8_t *)bh->b_data;
2214 }
2215 }
2216 brelse(bh);
2217
2218 out:
2219 unlock_kernel();
2220
2221 return accum;
2222 }
2223
2224 static unsigned int udf_count_free_table(struct super_block *sb,
2225 struct inode *table)
2226 {
2227 unsigned int accum = 0;
2228 uint32_t elen;
2229 struct kernel_lb_addr eloc;
2230 int8_t etype;
2231 struct extent_position epos;
2232
2233 lock_kernel();
2234
2235 epos.block = UDF_I(table)->i_location;
2236 epos.offset = sizeof(struct unallocSpaceEntry);
2237 epos.bh = NULL;
2238
2239 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2240 accum += (elen >> table->i_sb->s_blocksize_bits);
2241
2242 brelse(epos.bh);
2243
2244 unlock_kernel();
2245
2246 return accum;
2247 }
2248
2249 static unsigned int udf_count_free(struct super_block *sb)
2250 {
2251 unsigned int accum = 0;
2252 struct udf_sb_info *sbi;
2253 struct udf_part_map *map;
2254
2255 sbi = UDF_SB(sb);
2256 if (sbi->s_lvid_bh) {
2257 struct logicalVolIntegrityDesc *lvid =
2258 (struct logicalVolIntegrityDesc *)
2259 sbi->s_lvid_bh->b_data;
2260 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2261 accum = le32_to_cpu(
2262 lvid->freeSpaceTable[sbi->s_partition]);
2263 if (accum == 0xFFFFFFFF)
2264 accum = 0;
2265 }
2266 }
2267
2268 if (accum)
2269 return accum;
2270
2271 map = &sbi->s_partmaps[sbi->s_partition];
2272 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2273 accum += udf_count_free_bitmap(sb,
2274 map->s_uspace.s_bitmap);
2275 }
2276 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2277 accum += udf_count_free_bitmap(sb,
2278 map->s_fspace.s_bitmap);
2279 }
2280 if (accum)
2281 return accum;
2282
2283 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2284 accum += udf_count_free_table(sb,
2285 map->s_uspace.s_table);
2286 }
2287 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2288 accum += udf_count_free_table(sb,
2289 map->s_fspace.s_table);
2290 }
2291
2292 return accum;
2293 }
Support for the Chinese Samsung S3C2440 based development boards