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Merge branch 'v6v7' into devel
[linux/fpc-iii.git] / fs / udf / super.c
blob7b27b063ff6d673423ecd0902d0076f1c0ea3ccf
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/buffer_head.h>
52 #include <linux/vfs.h>
53 #include <linux/vmalloc.h>
54 #include <linux/errno.h>
55 #include <linux/mount.h>
56 #include <linux/seq_file.h>
57 #include <linux/bitmap.h>
58 #include <linux/crc-itu-t.h>
59 #include <asm/byteorder.h>
60
61 #include "udf_sb.h"
62 #include "udf_i.h"
63
64 #include <linux/init.h>
65 #include <asm/uaccess.h>
66
67 #define VDS_POS_PRIMARY_VOL_DESC 0
68 #define VDS_POS_UNALLOC_SPACE_DESC 1
69 #define VDS_POS_LOGICAL_VOL_DESC 2
70 #define VDS_POS_PARTITION_DESC 3
71 #define VDS_POS_IMP_USE_VOL_DESC 4
72 #define VDS_POS_VOL_DESC_PTR 5
73 #define VDS_POS_TERMINATING_DESC 6
74 #define VDS_POS_LENGTH 7
75
76 #define UDF_DEFAULT_BLOCKSIZE 2048
77
78 static char error_buf[1024];
79
80 /* These are the "meat" - everything else is stuffing */
81 static int udf_fill_super(struct super_block *, void *, int);
82 static void udf_put_super(struct super_block *);
83 static int udf_sync_fs(struct super_block *, int);
84 static int udf_remount_fs(struct super_block *, int *, char *);
85 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
86 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
87 struct kernel_lb_addr *);
88 static void udf_load_fileset(struct super_block *, struct buffer_head *,
89 struct kernel_lb_addr *);
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 static int udf_show_options(struct seq_file *, struct vfsmount *);
95 static void udf_error(struct super_block *sb, const char *function,
96 const char *fmt, ...);
97
98 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
99 {
100 struct logicalVolIntegrityDesc *lvid =
101 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
102 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
103 __u32 offset = number_of_partitions * 2 *
104 sizeof(uint32_t)/sizeof(uint8_t);
105 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
106 }
107
108 /* UDF filesystem type */
109 static struct dentry *udf_mount(struct file_system_type *fs_type,
110 int flags, const char *dev_name, void *data)
111 {
112 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
113 }
114
115 static struct file_system_type udf_fstype = {
116 .owner = THIS_MODULE,
117 .name = "udf",
118 .mount = udf_mount,
119 .kill_sb = kill_block_super,
120 .fs_flags = FS_REQUIRES_DEV,
121 };
122
123 static struct kmem_cache *udf_inode_cachep;
124
125 static struct inode *udf_alloc_inode(struct super_block *sb)
126 {
127 struct udf_inode_info *ei;
128 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
129 if (!ei)
130 return NULL;
131
132 ei->i_unique = 0;
133 ei->i_lenExtents = 0;
134 ei->i_next_alloc_block = 0;
135 ei->i_next_alloc_goal = 0;
136 ei->i_strat4096 = 0;
137 init_rwsem(&ei->i_data_sem);
138
139 return &ei->vfs_inode;
140 }
141
142 static void udf_i_callback(struct rcu_head *head)
143 {
144 struct inode *inode = container_of(head, struct inode, i_rcu);
145 INIT_LIST_HEAD(&inode->i_dentry);
146 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
147 }
148
149 static void udf_destroy_inode(struct inode *inode)
150 {
151 call_rcu(&inode->i_rcu, udf_i_callback);
152 }
153
154 static void init_once(void *foo)
155 {
156 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
157
158 ei->i_ext.i_data = NULL;
159 inode_init_once(&ei->vfs_inode);
160 }
161
162 static int init_inodecache(void)
163 {
164 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
165 sizeof(struct udf_inode_info),
166 0, (SLAB_RECLAIM_ACCOUNT |
167 SLAB_MEM_SPREAD),
168 init_once);
169 if (!udf_inode_cachep)
170 return -ENOMEM;
171 return 0;
172 }
173
174 static void destroy_inodecache(void)
175 {
176 kmem_cache_destroy(udf_inode_cachep);
177 }
178
179 /* Superblock operations */
180 static const struct super_operations udf_sb_ops = {
181 .alloc_inode = udf_alloc_inode,
182 .destroy_inode = udf_destroy_inode,
183 .write_inode = udf_write_inode,
184 .evict_inode = udf_evict_inode,
185 .put_super = udf_put_super,
186 .sync_fs = udf_sync_fs,
187 .statfs = udf_statfs,
188 .remount_fs = udf_remount_fs,
189 .show_options = udf_show_options,
190 };
191
192 struct udf_options {
193 unsigned char novrs;
194 unsigned int blocksize;
195 unsigned int session;
196 unsigned int lastblock;
197 unsigned int anchor;
198 unsigned int volume;
199 unsigned short partition;
200 unsigned int fileset;
201 unsigned int rootdir;
202 unsigned int flags;
203 mode_t umask;
204 gid_t gid;
205 uid_t uid;
206 mode_t fmode;
207 mode_t dmode;
208 struct nls_table *nls_map;
209 };
210
211 static int __init init_udf_fs(void)
212 {
213 int err;
214
215 err = init_inodecache();
216 if (err)
217 goto out1;
218 err = register_filesystem(&udf_fstype);
219 if (err)
220 goto out;
221
222 return 0;
223
224 out:
225 destroy_inodecache();
226
227 out1:
228 return err;
229 }
230
231 static void __exit exit_udf_fs(void)
232 {
233 unregister_filesystem(&udf_fstype);
234 destroy_inodecache();
235 }
236
237 module_init(init_udf_fs)
238 module_exit(exit_udf_fs)
239
240 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
241 {
242 struct udf_sb_info *sbi = UDF_SB(sb);
243
244 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
245 GFP_KERNEL);
246 if (!sbi->s_partmaps) {
247 udf_error(sb, __func__,
248 "Unable to allocate space for %d partition maps",
249 count);
250 sbi->s_partitions = 0;
251 return -ENOMEM;
252 }
253
254 sbi->s_partitions = count;
255 return 0;
256 }
257
258 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
259 {
260 struct super_block *sb = mnt->mnt_sb;
261 struct udf_sb_info *sbi = UDF_SB(sb);
262
263 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
264 seq_puts(seq, ",nostrict");
265 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
266 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
267 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
268 seq_puts(seq, ",unhide");
269 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
270 seq_puts(seq, ",undelete");
271 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
272 seq_puts(seq, ",noadinicb");
273 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
274 seq_puts(seq, ",shortad");
275 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
276 seq_puts(seq, ",uid=forget");
277 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
278 seq_puts(seq, ",uid=ignore");
279 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
280 seq_puts(seq, ",gid=forget");
281 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
282 seq_puts(seq, ",gid=ignore");
283 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
284 seq_printf(seq, ",uid=%u", sbi->s_uid);
285 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
286 seq_printf(seq, ",gid=%u", sbi->s_gid);
287 if (sbi->s_umask != 0)
288 seq_printf(seq, ",umask=%o", sbi->s_umask);
289 if (sbi->s_fmode != UDF_INVALID_MODE)
290 seq_printf(seq, ",mode=%o", sbi->s_fmode);
291 if (sbi->s_dmode != UDF_INVALID_MODE)
292 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
293 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
294 seq_printf(seq, ",session=%u", sbi->s_session);
295 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
296 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
297 if (sbi->s_anchor != 0)
298 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
299 /*
300 * volume, partition, fileset and rootdir seem to be ignored
301 * currently
302 */
303 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
304 seq_puts(seq, ",utf8");
305 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
306 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
307
308 return 0;
309 }
310
311 /*
312 * udf_parse_options
313 *
314 * PURPOSE
315 * Parse mount options.
316 *
317 * DESCRIPTION
318 * The following mount options are supported:
319 *
320 * gid= Set the default group.
321 * umask= Set the default umask.
322 * mode= Set the default file permissions.
323 * dmode= Set the default directory permissions.
324 * uid= Set the default user.
325 * bs= Set the block size.
326 * unhide Show otherwise hidden files.
327 * undelete Show deleted files in lists.
328 * adinicb Embed data in the inode (default)
329 * noadinicb Don't embed data in the inode
330 * shortad Use short ad's
331 * longad Use long ad's (default)
332 * nostrict Unset strict conformance
333 * iocharset= Set the NLS character set
334 *
335 * The remaining are for debugging and disaster recovery:
336 *
337 * novrs Skip volume sequence recognition
338 *
339 * The following expect a offset from 0.
340 *
341 * session= Set the CDROM session (default= last session)
342 * anchor= Override standard anchor location. (default= 256)
343 * volume= Override the VolumeDesc location. (unused)
344 * partition= Override the PartitionDesc location. (unused)
345 * lastblock= Set the last block of the filesystem/
346 *
347 * The following expect a offset from the partition root.
348 *
349 * fileset= Override the fileset block location. (unused)
350 * rootdir= Override the root directory location. (unused)
351 * WARNING: overriding the rootdir to a non-directory may
352 * yield highly unpredictable results.
353 *
354 * PRE-CONDITIONS
355 * options Pointer to mount options string.
356 * uopts Pointer to mount options variable.
357 *
358 * POST-CONDITIONS
359 * <return> 1 Mount options parsed okay.
360 * <return> 0 Error parsing mount options.
361 *
362 * HISTORY
363 * July 1, 1997 - Andrew E. Mileski
364 * Written, tested, and released.
365 */
366
367 enum {
368 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
369 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
370 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
371 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
372 Opt_rootdir, Opt_utf8, Opt_iocharset,
373 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
374 Opt_fmode, Opt_dmode
375 };
376
377 static const match_table_t tokens = {
378 {Opt_novrs, "novrs"},
379 {Opt_nostrict, "nostrict"},
380 {Opt_bs, "bs=%u"},
381 {Opt_unhide, "unhide"},
382 {Opt_undelete, "undelete"},
383 {Opt_noadinicb, "noadinicb"},
384 {Opt_adinicb, "adinicb"},
385 {Opt_shortad, "shortad"},
386 {Opt_longad, "longad"},
387 {Opt_uforget, "uid=forget"},
388 {Opt_uignore, "uid=ignore"},
389 {Opt_gforget, "gid=forget"},
390 {Opt_gignore, "gid=ignore"},
391 {Opt_gid, "gid=%u"},
392 {Opt_uid, "uid=%u"},
393 {Opt_umask, "umask=%o"},
394 {Opt_session, "session=%u"},
395 {Opt_lastblock, "lastblock=%u"},
396 {Opt_anchor, "anchor=%u"},
397 {Opt_volume, "volume=%u"},
398 {Opt_partition, "partition=%u"},
399 {Opt_fileset, "fileset=%u"},
400 {Opt_rootdir, "rootdir=%u"},
401 {Opt_utf8, "utf8"},
402 {Opt_iocharset, "iocharset=%s"},
403 {Opt_fmode, "mode=%o"},
404 {Opt_dmode, "dmode=%o"},
405 {Opt_err, NULL}
406 };
407
408 static int udf_parse_options(char *options, struct udf_options *uopt,
409 bool remount)
410 {
411 char *p;
412 int option;
413
414 uopt->novrs = 0;
415 uopt->partition = 0xFFFF;
416 uopt->session = 0xFFFFFFFF;
417 uopt->lastblock = 0;
418 uopt->anchor = 0;
419 uopt->volume = 0xFFFFFFFF;
420 uopt->rootdir = 0xFFFFFFFF;
421 uopt->fileset = 0xFFFFFFFF;
422 uopt->nls_map = NULL;
423
424 if (!options)
425 return 1;
426
427 while ((p = strsep(&options, ",")) != NULL) {
428 substring_t args[MAX_OPT_ARGS];
429 int token;
430 if (!*p)
431 continue;
432
433 token = match_token(p, tokens, args);
434 switch (token) {
435 case Opt_novrs:
436 uopt->novrs = 1;
437 break;
438 case Opt_bs:
439 if (match_int(&args[0], &option))
440 return 0;
441 uopt->blocksize = option;
442 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
443 break;
444 case Opt_unhide:
445 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
446 break;
447 case Opt_undelete:
448 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
449 break;
450 case Opt_noadinicb:
451 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
452 break;
453 case Opt_adinicb:
454 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
455 break;
456 case Opt_shortad:
457 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
458 break;
459 case Opt_longad:
460 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
461 break;
462 case Opt_gid:
463 if (match_int(args, &option))
464 return 0;
465 uopt->gid = option;
466 uopt->flags |= (1 << UDF_FLAG_GID_SET);
467 break;
468 case Opt_uid:
469 if (match_int(args, &option))
470 return 0;
471 uopt->uid = option;
472 uopt->flags |= (1 << UDF_FLAG_UID_SET);
473 break;
474 case Opt_umask:
475 if (match_octal(args, &option))
476 return 0;
477 uopt->umask = option;
478 break;
479 case Opt_nostrict:
480 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
481 break;
482 case Opt_session:
483 if (match_int(args, &option))
484 return 0;
485 uopt->session = option;
486 if (!remount)
487 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
488 break;
489 case Opt_lastblock:
490 if (match_int(args, &option))
491 return 0;
492 uopt->lastblock = option;
493 if (!remount)
494 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
495 break;
496 case Opt_anchor:
497 if (match_int(args, &option))
498 return 0;
499 uopt->anchor = option;
500 break;
501 case Opt_volume:
502 if (match_int(args, &option))
503 return 0;
504 uopt->volume = option;
505 break;
506 case Opt_partition:
507 if (match_int(args, &option))
508 return 0;
509 uopt->partition = option;
510 break;
511 case Opt_fileset:
512 if (match_int(args, &option))
513 return 0;
514 uopt->fileset = option;
515 break;
516 case Opt_rootdir:
517 if (match_int(args, &option))
518 return 0;
519 uopt->rootdir = option;
520 break;
521 case Opt_utf8:
522 uopt->flags |= (1 << UDF_FLAG_UTF8);
523 break;
524 #ifdef CONFIG_UDF_NLS
525 case Opt_iocharset:
526 uopt->nls_map = load_nls(args[0].from);
527 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
528 break;
529 #endif
530 case Opt_uignore:
531 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
532 break;
533 case Opt_uforget:
534 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
535 break;
536 case Opt_gignore:
537 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
538 break;
539 case Opt_gforget:
540 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
541 break;
542 case Opt_fmode:
543 if (match_octal(args, &option))
544 return 0;
545 uopt->fmode = option & 0777;
546 break;
547 case Opt_dmode:
548 if (match_octal(args, &option))
549 return 0;
550 uopt->dmode = option & 0777;
551 break;
552 default:
553 printk(KERN_ERR "udf: bad mount option \"%s\" "
554 "or missing value\n", p);
555 return 0;
556 }
557 }
558 return 1;
559 }
560
561 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
562 {
563 struct udf_options uopt;
564 struct udf_sb_info *sbi = UDF_SB(sb);
565 int error = 0;
566
567 uopt.flags = sbi->s_flags;
568 uopt.uid = sbi->s_uid;
569 uopt.gid = sbi->s_gid;
570 uopt.umask = sbi->s_umask;
571 uopt.fmode = sbi->s_fmode;
572 uopt.dmode = sbi->s_dmode;
573
574 if (!udf_parse_options(options, &uopt, true))
575 return -EINVAL;
576
577 write_lock(&sbi->s_cred_lock);
578 sbi->s_flags = uopt.flags;
579 sbi->s_uid = uopt.uid;
580 sbi->s_gid = uopt.gid;
581 sbi->s_umask = uopt.umask;
582 sbi->s_fmode = uopt.fmode;
583 sbi->s_dmode = uopt.dmode;
584 write_unlock(&sbi->s_cred_lock);
585
586 if (sbi->s_lvid_bh) {
587 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
588 if (write_rev > UDF_MAX_WRITE_VERSION)
589 *flags |= MS_RDONLY;
590 }
591
592 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
593 goto out_unlock;
594
595 if (*flags & MS_RDONLY)
596 udf_close_lvid(sb);
597 else
598 udf_open_lvid(sb);
599
600 out_unlock:
601 return error;
602 }
603
604 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
605 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
606 static loff_t udf_check_vsd(struct super_block *sb)
607 {
608 struct volStructDesc *vsd = NULL;
609 loff_t sector = 32768;
610 int sectorsize;
611 struct buffer_head *bh = NULL;
612 int nsr02 = 0;
613 int nsr03 = 0;
614 struct udf_sb_info *sbi;
615
616 sbi = UDF_SB(sb);
617 if (sb->s_blocksize < sizeof(struct volStructDesc))
618 sectorsize = sizeof(struct volStructDesc);
619 else
620 sectorsize = sb->s_blocksize;
621
622 sector += (sbi->s_session << sb->s_blocksize_bits);
623
624 udf_debug("Starting at sector %u (%ld byte sectors)\n",
625 (unsigned int)(sector >> sb->s_blocksize_bits),
626 sb->s_blocksize);
627 /* Process the sequence (if applicable) */
628 for (; !nsr02 && !nsr03; sector += sectorsize) {
629 /* Read a block */
630 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
631 if (!bh)
632 break;
633
634 /* Look for ISO descriptors */
635 vsd = (struct volStructDesc *)(bh->b_data +
636 (sector & (sb->s_blocksize - 1)));
637
638 if (vsd->stdIdent[0] == 0) {
639 brelse(bh);
640 break;
641 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
642 VSD_STD_ID_LEN)) {
643 switch (vsd->structType) {
644 case 0:
645 udf_debug("ISO9660 Boot Record found\n");
646 break;
647 case 1:
648 udf_debug("ISO9660 Primary Volume Descriptor "
649 "found\n");
650 break;
651 case 2:
652 udf_debug("ISO9660 Supplementary Volume "
653 "Descriptor found\n");
654 break;
655 case 3:
656 udf_debug("ISO9660 Volume Partition Descriptor "
657 "found\n");
658 break;
659 case 255:
660 udf_debug("ISO9660 Volume Descriptor Set "
661 "Terminator found\n");
662 break;
663 default:
664 udf_debug("ISO9660 VRS (%u) found\n",
665 vsd->structType);
666 break;
667 }
668 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
669 VSD_STD_ID_LEN))
670 ; /* nothing */
671 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
672 VSD_STD_ID_LEN)) {
673 brelse(bh);
674 break;
675 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
676 VSD_STD_ID_LEN))
677 nsr02 = sector;
678 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
679 VSD_STD_ID_LEN))
680 nsr03 = sector;
681 brelse(bh);
682 }
683
684 if (nsr03)
685 return nsr03;
686 else if (nsr02)
687 return nsr02;
688 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
689 return -1;
690 else
691 return 0;
692 }
693
694 static int udf_find_fileset(struct super_block *sb,
695 struct kernel_lb_addr *fileset,
696 struct kernel_lb_addr *root)
697 {
698 struct buffer_head *bh = NULL;
699 long lastblock;
700 uint16_t ident;
701 struct udf_sb_info *sbi;
702
703 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
704 fileset->partitionReferenceNum != 0xFFFF) {
705 bh = udf_read_ptagged(sb, fileset, 0, &ident);
706
707 if (!bh) {
708 return 1;
709 } else if (ident != TAG_IDENT_FSD) {
710 brelse(bh);
711 return 1;
712 }
713
714 }
715
716 sbi = UDF_SB(sb);
717 if (!bh) {
718 /* Search backwards through the partitions */
719 struct kernel_lb_addr newfileset;
720
721 /* --> cvg: FIXME - is it reasonable? */
722 return 1;
723
724 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
725 (newfileset.partitionReferenceNum != 0xFFFF &&
726 fileset->logicalBlockNum == 0xFFFFFFFF &&
727 fileset->partitionReferenceNum == 0xFFFF);
728 newfileset.partitionReferenceNum--) {
729 lastblock = sbi->s_partmaps
730 [newfileset.partitionReferenceNum]
731 .s_partition_len;
732 newfileset.logicalBlockNum = 0;
733
734 do {
735 bh = udf_read_ptagged(sb, &newfileset, 0,
736 &ident);
737 if (!bh) {
738 newfileset.logicalBlockNum++;
739 continue;
740 }
741
742 switch (ident) {
743 case TAG_IDENT_SBD:
744 {
745 struct spaceBitmapDesc *sp;
746 sp = (struct spaceBitmapDesc *)
747 bh->b_data;
748 newfileset.logicalBlockNum += 1 +
749 ((le32_to_cpu(sp->numOfBytes) +
750 sizeof(struct spaceBitmapDesc)
751 - 1) >> sb->s_blocksize_bits);
752 brelse(bh);
753 break;
754 }
755 case TAG_IDENT_FSD:
756 *fileset = newfileset;
757 break;
758 default:
759 newfileset.logicalBlockNum++;
760 brelse(bh);
761 bh = NULL;
762 break;
763 }
764 } while (newfileset.logicalBlockNum < lastblock &&
765 fileset->logicalBlockNum == 0xFFFFFFFF &&
766 fileset->partitionReferenceNum == 0xFFFF);
767 }
768 }
769
770 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
771 fileset->partitionReferenceNum != 0xFFFF) && bh) {
772 udf_debug("Fileset at block=%d, partition=%d\n",
773 fileset->logicalBlockNum,
774 fileset->partitionReferenceNum);
775
776 sbi->s_partition = fileset->partitionReferenceNum;
777 udf_load_fileset(sb, bh, root);
778 brelse(bh);
779 return 0;
780 }
781 return 1;
782 }
783
784 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
785 {
786 struct primaryVolDesc *pvoldesc;
787 struct ustr *instr, *outstr;
788 struct buffer_head *bh;
789 uint16_t ident;
790 int ret = 1;
791
792 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
793 if (!instr)
794 return 1;
795
796 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
797 if (!outstr)
798 goto out1;
799
800 bh = udf_read_tagged(sb, block, block, &ident);
801 if (!bh)
802 goto out2;
803
804 BUG_ON(ident != TAG_IDENT_PVD);
805
806 pvoldesc = (struct primaryVolDesc *)bh->b_data;
807
808 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
809 pvoldesc->recordingDateAndTime)) {
810 #ifdef UDFFS_DEBUG
811 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
812 udf_debug("recording time %04u/%02u/%02u"
813 " %02u:%02u (%x)\n",
814 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
815 ts->minute, le16_to_cpu(ts->typeAndTimezone));
816 #endif
817 }
818
819 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
820 if (udf_CS0toUTF8(outstr, instr)) {
821 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
822 outstr->u_len > 31 ? 31 : outstr->u_len);
823 udf_debug("volIdent[] = '%s'\n",
824 UDF_SB(sb)->s_volume_ident);
825 }
826
827 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
828 if (udf_CS0toUTF8(outstr, instr))
829 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
830
831 brelse(bh);
832 ret = 0;
833 out2:
834 kfree(outstr);
835 out1:
836 kfree(instr);
837 return ret;
838 }
839
840 static int udf_load_metadata_files(struct super_block *sb, int partition)
841 {
842 struct udf_sb_info *sbi = UDF_SB(sb);
843 struct udf_part_map *map;
844 struct udf_meta_data *mdata;
845 struct kernel_lb_addr addr;
846 int fe_error = 0;
847
848 map = &sbi->s_partmaps[partition];
849 mdata = &map->s_type_specific.s_metadata;
850
851 /* metadata address */
852 addr.logicalBlockNum = mdata->s_meta_file_loc;
853 addr.partitionReferenceNum = map->s_partition_num;
854
855 udf_debug("Metadata file location: block = %d part = %d\n",
856 addr.logicalBlockNum, addr.partitionReferenceNum);
857
858 mdata->s_metadata_fe = udf_iget(sb, &addr);
859
860 if (mdata->s_metadata_fe == NULL) {
861 udf_warning(sb, __func__, "metadata inode efe not found, "
862 "will try mirror inode.");
863 fe_error = 1;
864 } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
865 ICBTAG_FLAG_AD_SHORT) {
866 udf_warning(sb, __func__, "metadata inode efe does not have "
867 "short allocation descriptors!");
868 fe_error = 1;
869 iput(mdata->s_metadata_fe);
870 mdata->s_metadata_fe = NULL;
871 }
872
873 /* mirror file entry */
874 addr.logicalBlockNum = mdata->s_mirror_file_loc;
875 addr.partitionReferenceNum = map->s_partition_num;
876
877 udf_debug("Mirror metadata file location: block = %d part = %d\n",
878 addr.logicalBlockNum, addr.partitionReferenceNum);
879
880 mdata->s_mirror_fe = udf_iget(sb, &addr);
881
882 if (mdata->s_mirror_fe == NULL) {
883 if (fe_error) {
884 udf_error(sb, __func__, "mirror inode efe not found "
885 "and metadata inode is missing too, exiting...");
886 goto error_exit;
887 } else
888 udf_warning(sb, __func__, "mirror inode efe not found,"
889 " but metadata inode is OK");
890 } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
891 ICBTAG_FLAG_AD_SHORT) {
892 udf_warning(sb, __func__, "mirror inode efe does not have "
893 "short allocation descriptors!");
894 iput(mdata->s_mirror_fe);
895 mdata->s_mirror_fe = NULL;
896 if (fe_error)
897 goto error_exit;
898 }
899
900 /*
901 * bitmap file entry
902 * Note:
903 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
904 */
905 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
906 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
907 addr.partitionReferenceNum = map->s_partition_num;
908
909 udf_debug("Bitmap file location: block = %d part = %d\n",
910 addr.logicalBlockNum, addr.partitionReferenceNum);
911
912 mdata->s_bitmap_fe = udf_iget(sb, &addr);
913
914 if (mdata->s_bitmap_fe == NULL) {
915 if (sb->s_flags & MS_RDONLY)
916 udf_warning(sb, __func__, "bitmap inode efe "
917 "not found but it's ok since the disc"
918 " is mounted read-only");
919 else {
920 udf_error(sb, __func__, "bitmap inode efe not "
921 "found and attempted read-write mount");
922 goto error_exit;
923 }
924 }
925 }
926
927 udf_debug("udf_load_metadata_files Ok\n");
928
929 return 0;
930
931 error_exit:
932 return 1;
933 }
934
935 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
936 struct kernel_lb_addr *root)
937 {
938 struct fileSetDesc *fset;
939
940 fset = (struct fileSetDesc *)bh->b_data;
941
942 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
943
944 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
945
946 udf_debug("Rootdir at block=%d, partition=%d\n",
947 root->logicalBlockNum, root->partitionReferenceNum);
948 }
949
950 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
951 {
952 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
953 return DIV_ROUND_UP(map->s_partition_len +
954 (sizeof(struct spaceBitmapDesc) << 3),
955 sb->s_blocksize * 8);
956 }
957
958 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
959 {
960 struct udf_bitmap *bitmap;
961 int nr_groups;
962 int size;
963
964 nr_groups = udf_compute_nr_groups(sb, index);
965 size = sizeof(struct udf_bitmap) +
966 (sizeof(struct buffer_head *) * nr_groups);
967
968 if (size <= PAGE_SIZE)
969 bitmap = kzalloc(size, GFP_KERNEL);
970 else
971 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
972
973 if (bitmap == NULL) {
974 udf_error(sb, __func__,
975 "Unable to allocate space for bitmap "
976 "and %d buffer_head pointers", nr_groups);
977 return NULL;
978 }
979
980 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
981 bitmap->s_nr_groups = nr_groups;
982 return bitmap;
983 }
984
985 static int udf_fill_partdesc_info(struct super_block *sb,
986 struct partitionDesc *p, int p_index)
987 {
988 struct udf_part_map *map;
989 struct udf_sb_info *sbi = UDF_SB(sb);
990 struct partitionHeaderDesc *phd;
991
992 map = &sbi->s_partmaps[p_index];
993
994 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
995 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
996
997 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
998 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
999 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1000 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1001 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1002 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1003 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1004 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1005
1006 udf_debug("Partition (%d type %x) starts at physical %d, "
1007 "block length %d\n", p_index,
1008 map->s_partition_type, map->s_partition_root,
1009 map->s_partition_len);
1010
1011 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1012 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1013 return 0;
1014
1015 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1016 if (phd->unallocSpaceTable.extLength) {
1017 struct kernel_lb_addr loc = {
1018 .logicalBlockNum = le32_to_cpu(
1019 phd->unallocSpaceTable.extPosition),
1020 .partitionReferenceNum = p_index,
1021 };
1022
1023 map->s_uspace.s_table = udf_iget(sb, &loc);
1024 if (!map->s_uspace.s_table) {
1025 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1026 p_index);
1027 return 1;
1028 }
1029 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1030 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1031 p_index, map->s_uspace.s_table->i_ino);
1032 }
1033
1034 if (phd->unallocSpaceBitmap.extLength) {
1035 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1036 if (!bitmap)
1037 return 1;
1038 map->s_uspace.s_bitmap = bitmap;
1039 bitmap->s_extLength = le32_to_cpu(
1040 phd->unallocSpaceBitmap.extLength);
1041 bitmap->s_extPosition = le32_to_cpu(
1042 phd->unallocSpaceBitmap.extPosition);
1043 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1044 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1045 bitmap->s_extPosition);
1046 }
1047
1048 if (phd->partitionIntegrityTable.extLength)
1049 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1050
1051 if (phd->freedSpaceTable.extLength) {
1052 struct kernel_lb_addr loc = {
1053 .logicalBlockNum = le32_to_cpu(
1054 phd->freedSpaceTable.extPosition),
1055 .partitionReferenceNum = p_index,
1056 };
1057
1058 map->s_fspace.s_table = udf_iget(sb, &loc);
1059 if (!map->s_fspace.s_table) {
1060 udf_debug("cannot load freedSpaceTable (part %d)\n",
1061 p_index);
1062 return 1;
1063 }
1064
1065 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1066 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1067 p_index, map->s_fspace.s_table->i_ino);
1068 }
1069
1070 if (phd->freedSpaceBitmap.extLength) {
1071 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1072 if (!bitmap)
1073 return 1;
1074 map->s_fspace.s_bitmap = bitmap;
1075 bitmap->s_extLength = le32_to_cpu(
1076 phd->freedSpaceBitmap.extLength);
1077 bitmap->s_extPosition = le32_to_cpu(
1078 phd->freedSpaceBitmap.extPosition);
1079 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1080 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1081 bitmap->s_extPosition);
1082 }
1083 return 0;
1084 }
1085
1086 static void udf_find_vat_block(struct super_block *sb, int p_index,
1087 int type1_index, sector_t start_block)
1088 {
1089 struct udf_sb_info *sbi = UDF_SB(sb);
1090 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1091 sector_t vat_block;
1092 struct kernel_lb_addr ino;
1093
1094 /*
1095 * VAT file entry is in the last recorded block. Some broken disks have
1096 * it a few blocks before so try a bit harder...
1097 */
1098 ino.partitionReferenceNum = type1_index;
1099 for (vat_block = start_block;
1100 vat_block >= map->s_partition_root &&
1101 vat_block >= start_block - 3 &&
1102 !sbi->s_vat_inode; vat_block--) {
1103 ino.logicalBlockNum = vat_block - map->s_partition_root;
1104 sbi->s_vat_inode = udf_iget(sb, &ino);
1105 }
1106 }
1107
1108 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1109 {
1110 struct udf_sb_info *sbi = UDF_SB(sb);
1111 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1112 struct buffer_head *bh = NULL;
1113 struct udf_inode_info *vati;
1114 uint32_t pos;
1115 struct virtualAllocationTable20 *vat20;
1116 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1117
1118 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1119 if (!sbi->s_vat_inode &&
1120 sbi->s_last_block != blocks - 1) {
1121 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1122 " last recorded block (%lu), retrying with the last "
1123 "block of the device (%lu).\n",
1124 (unsigned long)sbi->s_last_block,
1125 (unsigned long)blocks - 1);
1126 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1127 }
1128 if (!sbi->s_vat_inode)
1129 return 1;
1130
1131 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1132 map->s_type_specific.s_virtual.s_start_offset = 0;
1133 map->s_type_specific.s_virtual.s_num_entries =
1134 (sbi->s_vat_inode->i_size - 36) >> 2;
1135 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1136 vati = UDF_I(sbi->s_vat_inode);
1137 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1138 pos = udf_block_map(sbi->s_vat_inode, 0);
1139 bh = sb_bread(sb, pos);
1140 if (!bh)
1141 return 1;
1142 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1143 } else {
1144 vat20 = (struct virtualAllocationTable20 *)
1145 vati->i_ext.i_data;
1146 }
1147
1148 map->s_type_specific.s_virtual.s_start_offset =
1149 le16_to_cpu(vat20->lengthHeader);
1150 map->s_type_specific.s_virtual.s_num_entries =
1151 (sbi->s_vat_inode->i_size -
1152 map->s_type_specific.s_virtual.
1153 s_start_offset) >> 2;
1154 brelse(bh);
1155 }
1156 return 0;
1157 }
1158
1159 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1160 {
1161 struct buffer_head *bh;
1162 struct partitionDesc *p;
1163 struct udf_part_map *map;
1164 struct udf_sb_info *sbi = UDF_SB(sb);
1165 int i, type1_idx;
1166 uint16_t partitionNumber;
1167 uint16_t ident;
1168 int ret = 0;
1169
1170 bh = udf_read_tagged(sb, block, block, &ident);
1171 if (!bh)
1172 return 1;
1173 if (ident != TAG_IDENT_PD)
1174 goto out_bh;
1175
1176 p = (struct partitionDesc *)bh->b_data;
1177 partitionNumber = le16_to_cpu(p->partitionNumber);
1178
1179 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1180 for (i = 0; i < sbi->s_partitions; i++) {
1181 map = &sbi->s_partmaps[i];
1182 udf_debug("Searching map: (%d == %d)\n",
1183 map->s_partition_num, partitionNumber);
1184 if (map->s_partition_num == partitionNumber &&
1185 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1186 map->s_partition_type == UDF_SPARABLE_MAP15))
1187 break;
1188 }
1189
1190 if (i >= sbi->s_partitions) {
1191 udf_debug("Partition (%d) not found in partition map\n",
1192 partitionNumber);
1193 goto out_bh;
1194 }
1195
1196 ret = udf_fill_partdesc_info(sb, p, i);
1197
1198 /*
1199 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1200 * PHYSICAL partitions are already set up
1201 */
1202 type1_idx = i;
1203 for (i = 0; i < sbi->s_partitions; i++) {
1204 map = &sbi->s_partmaps[i];
1205
1206 if (map->s_partition_num == partitionNumber &&
1207 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1208 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1209 map->s_partition_type == UDF_METADATA_MAP25))
1210 break;
1211 }
1212
1213 if (i >= sbi->s_partitions)
1214 goto out_bh;
1215
1216 ret = udf_fill_partdesc_info(sb, p, i);
1217 if (ret)
1218 goto out_bh;
1219
1220 if (map->s_partition_type == UDF_METADATA_MAP25) {
1221 ret = udf_load_metadata_files(sb, i);
1222 if (ret) {
1223 printk(KERN_ERR "UDF-fs: error loading MetaData "
1224 "partition map %d\n", i);
1225 goto out_bh;
1226 }
1227 } else {
1228 ret = udf_load_vat(sb, i, type1_idx);
1229 if (ret)
1230 goto out_bh;
1231 /*
1232 * Mark filesystem read-only if we have a partition with
1233 * virtual map since we don't handle writing to it (we
1234 * overwrite blocks instead of relocating them).
1235 */
1236 sb->s_flags |= MS_RDONLY;
1237 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1238 "because writing to pseudooverwrite partition is "
1239 "not implemented.\n");
1240 }
1241 out_bh:
1242 /* In case loading failed, we handle cleanup in udf_fill_super */
1243 brelse(bh);
1244 return ret;
1245 }
1246
1247 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1248 struct kernel_lb_addr *fileset)
1249 {
1250 struct logicalVolDesc *lvd;
1251 int i, j, offset;
1252 uint8_t type;
1253 struct udf_sb_info *sbi = UDF_SB(sb);
1254 struct genericPartitionMap *gpm;
1255 uint16_t ident;
1256 struct buffer_head *bh;
1257 int ret = 0;
1258
1259 bh = udf_read_tagged(sb, block, block, &ident);
1260 if (!bh)
1261 return 1;
1262 BUG_ON(ident != TAG_IDENT_LVD);
1263 lvd = (struct logicalVolDesc *)bh->b_data;
1264
1265 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1266 if (i != 0) {
1267 ret = i;
1268 goto out_bh;
1269 }
1270
1271 for (i = 0, offset = 0;
1272 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1273 i++, offset += gpm->partitionMapLength) {
1274 struct udf_part_map *map = &sbi->s_partmaps[i];
1275 gpm = (struct genericPartitionMap *)
1276 &(lvd->partitionMaps[offset]);
1277 type = gpm->partitionMapType;
1278 if (type == 1) {
1279 struct genericPartitionMap1 *gpm1 =
1280 (struct genericPartitionMap1 *)gpm;
1281 map->s_partition_type = UDF_TYPE1_MAP15;
1282 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1283 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1284 map->s_partition_func = NULL;
1285 } else if (type == 2) {
1286 struct udfPartitionMap2 *upm2 =
1287 (struct udfPartitionMap2 *)gpm;
1288 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1289 strlen(UDF_ID_VIRTUAL))) {
1290 u16 suf =
1291 le16_to_cpu(((__le16 *)upm2->partIdent.
1292 identSuffix)[0]);
1293 if (suf < 0x0200) {
1294 map->s_partition_type =
1295 UDF_VIRTUAL_MAP15;
1296 map->s_partition_func =
1297 udf_get_pblock_virt15;
1298 } else {
1299 map->s_partition_type =
1300 UDF_VIRTUAL_MAP20;
1301 map->s_partition_func =
1302 udf_get_pblock_virt20;
1303 }
1304 } else if (!strncmp(upm2->partIdent.ident,
1305 UDF_ID_SPARABLE,
1306 strlen(UDF_ID_SPARABLE))) {
1307 uint32_t loc;
1308 struct sparingTable *st;
1309 struct sparablePartitionMap *spm =
1310 (struct sparablePartitionMap *)gpm;
1311
1312 map->s_partition_type = UDF_SPARABLE_MAP15;
1313 map->s_type_specific.s_sparing.s_packet_len =
1314 le16_to_cpu(spm->packetLength);
1315 for (j = 0; j < spm->numSparingTables; j++) {
1316 struct buffer_head *bh2;
1317
1318 loc = le32_to_cpu(
1319 spm->locSparingTable[j]);
1320 bh2 = udf_read_tagged(sb, loc, loc,
1321 &ident);
1322 map->s_type_specific.s_sparing.
1323 s_spar_map[j] = bh2;
1324
1325 if (bh2 == NULL)
1326 continue;
1327
1328 st = (struct sparingTable *)bh2->b_data;
1329 if (ident != 0 || strncmp(
1330 st->sparingIdent.ident,
1331 UDF_ID_SPARING,
1332 strlen(UDF_ID_SPARING))) {
1333 brelse(bh2);
1334 map->s_type_specific.s_sparing.
1335 s_spar_map[j] = NULL;
1336 }
1337 }
1338 map->s_partition_func = udf_get_pblock_spar15;
1339 } else if (!strncmp(upm2->partIdent.ident,
1340 UDF_ID_METADATA,
1341 strlen(UDF_ID_METADATA))) {
1342 struct udf_meta_data *mdata =
1343 &map->s_type_specific.s_metadata;
1344 struct metadataPartitionMap *mdm =
1345 (struct metadataPartitionMap *)
1346 &(lvd->partitionMaps[offset]);
1347 udf_debug("Parsing Logical vol part %d "
1348 "type %d id=%s\n", i, type,
1349 UDF_ID_METADATA);
1350
1351 map->s_partition_type = UDF_METADATA_MAP25;
1352 map->s_partition_func = udf_get_pblock_meta25;
1353
1354 mdata->s_meta_file_loc =
1355 le32_to_cpu(mdm->metadataFileLoc);
1356 mdata->s_mirror_file_loc =
1357 le32_to_cpu(mdm->metadataMirrorFileLoc);
1358 mdata->s_bitmap_file_loc =
1359 le32_to_cpu(mdm->metadataBitmapFileLoc);
1360 mdata->s_alloc_unit_size =
1361 le32_to_cpu(mdm->allocUnitSize);
1362 mdata->s_align_unit_size =
1363 le16_to_cpu(mdm->alignUnitSize);
1364 mdata->s_dup_md_flag =
1365 mdm->flags & 0x01;
1366
1367 udf_debug("Metadata Ident suffix=0x%x\n",
1368 (le16_to_cpu(
1369 ((__le16 *)
1370 mdm->partIdent.identSuffix)[0])));
1371 udf_debug("Metadata part num=%d\n",
1372 le16_to_cpu(mdm->partitionNum));
1373 udf_debug("Metadata part alloc unit size=%d\n",
1374 le32_to_cpu(mdm->allocUnitSize));
1375 udf_debug("Metadata file loc=%d\n",
1376 le32_to_cpu(mdm->metadataFileLoc));
1377 udf_debug("Mirror file loc=%d\n",
1378 le32_to_cpu(mdm->metadataMirrorFileLoc));
1379 udf_debug("Bitmap file loc=%d\n",
1380 le32_to_cpu(mdm->metadataBitmapFileLoc));
1381 udf_debug("Duplicate Flag: %d %d\n",
1382 mdata->s_dup_md_flag, mdm->flags);
1383 } else {
1384 udf_debug("Unknown ident: %s\n",
1385 upm2->partIdent.ident);
1386 continue;
1387 }
1388 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1389 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1390 }
1391 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1392 i, map->s_partition_num, type,
1393 map->s_volumeseqnum);
1394 }
1395
1396 if (fileset) {
1397 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1398
1399 *fileset = lelb_to_cpu(la->extLocation);
1400 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1401 "partition=%d\n", fileset->logicalBlockNum,
1402 fileset->partitionReferenceNum);
1403 }
1404 if (lvd->integritySeqExt.extLength)
1405 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1406
1407 out_bh:
1408 brelse(bh);
1409 return ret;
1410 }
1411
1412 /*
1413 * udf_load_logicalvolint
1414 *
1415 */
1416 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1417 {
1418 struct buffer_head *bh = NULL;
1419 uint16_t ident;
1420 struct udf_sb_info *sbi = UDF_SB(sb);
1421 struct logicalVolIntegrityDesc *lvid;
1422
1423 while (loc.extLength > 0 &&
1424 (bh = udf_read_tagged(sb, loc.extLocation,
1425 loc.extLocation, &ident)) &&
1426 ident == TAG_IDENT_LVID) {
1427 sbi->s_lvid_bh = bh;
1428 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1429
1430 if (lvid->nextIntegrityExt.extLength)
1431 udf_load_logicalvolint(sb,
1432 leea_to_cpu(lvid->nextIntegrityExt));
1433
1434 if (sbi->s_lvid_bh != bh)
1435 brelse(bh);
1436 loc.extLength -= sb->s_blocksize;
1437 loc.extLocation++;
1438 }
1439 if (sbi->s_lvid_bh != bh)
1440 brelse(bh);
1441 }
1442
1443 /*
1444 * udf_process_sequence
1445 *
1446 * PURPOSE
1447 * Process a main/reserve volume descriptor sequence.
1448 *
1449 * PRE-CONDITIONS
1450 * sb Pointer to _locked_ superblock.
1451 * block First block of first extent of the sequence.
1452 * lastblock Lastblock of first extent of the sequence.
1453 *
1454 * HISTORY
1455 * July 1, 1997 - Andrew E. Mileski
1456 * Written, tested, and released.
1457 */
1458 static noinline int udf_process_sequence(struct super_block *sb, long block,
1459 long lastblock, struct kernel_lb_addr *fileset)
1460 {
1461 struct buffer_head *bh = NULL;
1462 struct udf_vds_record vds[VDS_POS_LENGTH];
1463 struct udf_vds_record *curr;
1464 struct generic_desc *gd;
1465 struct volDescPtr *vdp;
1466 int done = 0;
1467 uint32_t vdsn;
1468 uint16_t ident;
1469 long next_s = 0, next_e = 0;
1470
1471 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1472
1473 /*
1474 * Read the main descriptor sequence and find which descriptors
1475 * are in it.
1476 */
1477 for (; (!done && block <= lastblock); block++) {
1478
1479 bh = udf_read_tagged(sb, block, block, &ident);
1480 if (!bh) {
1481 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1482 "sequence is corrupted or we could not read "
1483 "it.\n", (unsigned long long)block);
1484 return 1;
1485 }
1486
1487 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1488 gd = (struct generic_desc *)bh->b_data;
1489 vdsn = le32_to_cpu(gd->volDescSeqNum);
1490 switch (ident) {
1491 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1492 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1493 if (vdsn >= curr->volDescSeqNum) {
1494 curr->volDescSeqNum = vdsn;
1495 curr->block = block;
1496 }
1497 break;
1498 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1499 curr = &vds[VDS_POS_VOL_DESC_PTR];
1500 if (vdsn >= curr->volDescSeqNum) {
1501 curr->volDescSeqNum = vdsn;
1502 curr->block = block;
1503
1504 vdp = (struct volDescPtr *)bh->b_data;
1505 next_s = le32_to_cpu(
1506 vdp->nextVolDescSeqExt.extLocation);
1507 next_e = le32_to_cpu(
1508 vdp->nextVolDescSeqExt.extLength);
1509 next_e = next_e >> sb->s_blocksize_bits;
1510 next_e += next_s;
1511 }
1512 break;
1513 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1514 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1515 if (vdsn >= curr->volDescSeqNum) {
1516 curr->volDescSeqNum = vdsn;
1517 curr->block = block;
1518 }
1519 break;
1520 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1521 curr = &vds[VDS_POS_PARTITION_DESC];
1522 if (!curr->block)
1523 curr->block = block;
1524 break;
1525 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1526 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1527 if (vdsn >= curr->volDescSeqNum) {
1528 curr->volDescSeqNum = vdsn;
1529 curr->block = block;
1530 }
1531 break;
1532 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1533 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1534 if (vdsn >= curr->volDescSeqNum) {
1535 curr->volDescSeqNum = vdsn;
1536 curr->block = block;
1537 }
1538 break;
1539 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1540 vds[VDS_POS_TERMINATING_DESC].block = block;
1541 if (next_e) {
1542 block = next_s;
1543 lastblock = next_e;
1544 next_s = next_e = 0;
1545 } else
1546 done = 1;
1547 break;
1548 }
1549 brelse(bh);
1550 }
1551 /*
1552 * Now read interesting descriptors again and process them
1553 * in a suitable order
1554 */
1555 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1556 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1557 return 1;
1558 }
1559 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1560 return 1;
1561
1562 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1563 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1564 return 1;
1565
1566 if (vds[VDS_POS_PARTITION_DESC].block) {
1567 /*
1568 * We rescan the whole descriptor sequence to find
1569 * partition descriptor blocks and process them.
1570 */
1571 for (block = vds[VDS_POS_PARTITION_DESC].block;
1572 block < vds[VDS_POS_TERMINATING_DESC].block;
1573 block++)
1574 if (udf_load_partdesc(sb, block))
1575 return 1;
1576 }
1577
1578 return 0;
1579 }
1580
1581 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1582 struct kernel_lb_addr *fileset)
1583 {
1584 struct anchorVolDescPtr *anchor;
1585 long main_s, main_e, reserve_s, reserve_e;
1586
1587 anchor = (struct anchorVolDescPtr *)bh->b_data;
1588
1589 /* Locate the main sequence */
1590 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1591 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1592 main_e = main_e >> sb->s_blocksize_bits;
1593 main_e += main_s;
1594
1595 /* Locate the reserve sequence */
1596 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1597 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1598 reserve_e = reserve_e >> sb->s_blocksize_bits;
1599 reserve_e += reserve_s;
1600
1601 /* Process the main & reserve sequences */
1602 /* responsible for finding the PartitionDesc(s) */
1603 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1604 return 1;
1605 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1606 }
1607
1608 /*
1609 * Check whether there is an anchor block in the given block and
1610 * load Volume Descriptor Sequence if so.
1611 */
1612 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1613 struct kernel_lb_addr *fileset)
1614 {
1615 struct buffer_head *bh;
1616 uint16_t ident;
1617 int ret;
1618
1619 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1620 udf_fixed_to_variable(block) >=
1621 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1622 return 0;
1623
1624 bh = udf_read_tagged(sb, block, block, &ident);
1625 if (!bh)
1626 return 0;
1627 if (ident != TAG_IDENT_AVDP) {
1628 brelse(bh);
1629 return 0;
1630 }
1631 ret = udf_load_sequence(sb, bh, fileset);
1632 brelse(bh);
1633 return ret;
1634 }
1635
1636 /* Search for an anchor volume descriptor pointer */
1637 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1638 struct kernel_lb_addr *fileset)
1639 {
1640 sector_t last[6];
1641 int i;
1642 struct udf_sb_info *sbi = UDF_SB(sb);
1643 int last_count = 0;
1644
1645 /* First try user provided anchor */
1646 if (sbi->s_anchor) {
1647 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1648 return lastblock;
1649 }
1650 /*
1651 * according to spec, anchor is in either:
1652 * block 256
1653 * lastblock-256
1654 * lastblock
1655 * however, if the disc isn't closed, it could be 512.
1656 */
1657 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1658 return lastblock;
1659 /*
1660 * The trouble is which block is the last one. Drives often misreport
1661 * this so we try various possibilities.
1662 */
1663 last[last_count++] = lastblock;
1664 if (lastblock >= 1)
1665 last[last_count++] = lastblock - 1;
1666 last[last_count++] = lastblock + 1;
1667 if (lastblock >= 2)
1668 last[last_count++] = lastblock - 2;
1669 if (lastblock >= 150)
1670 last[last_count++] = lastblock - 150;
1671 if (lastblock >= 152)
1672 last[last_count++] = lastblock - 152;
1673
1674 for (i = 0; i < last_count; i++) {
1675 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1676 sb->s_blocksize_bits)
1677 continue;
1678 if (udf_check_anchor_block(sb, last[i], fileset))
1679 return last[i];
1680 if (last[i] < 256)
1681 continue;
1682 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1683 return last[i];
1684 }
1685
1686 /* Finally try block 512 in case media is open */
1687 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1688 return last[0];
1689 return 0;
1690 }
1691
1692 /*
1693 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1694 * area specified by it. The function expects sbi->s_lastblock to be the last
1695 * block on the media.
1696 *
1697 * Return 1 if ok, 0 if not found.
1698 *
1699 */
1700 static int udf_find_anchor(struct super_block *sb,
1701 struct kernel_lb_addr *fileset)
1702 {
1703 sector_t lastblock;
1704 struct udf_sb_info *sbi = UDF_SB(sb);
1705
1706 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1707 if (lastblock)
1708 goto out;
1709
1710 /* No anchor found? Try VARCONV conversion of block numbers */
1711 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1712 /* Firstly, we try to not convert number of the last block */
1713 lastblock = udf_scan_anchors(sb,
1714 udf_variable_to_fixed(sbi->s_last_block),
1715 fileset);
1716 if (lastblock)
1717 goto out;
1718
1719 /* Secondly, we try with converted number of the last block */
1720 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1721 if (!lastblock) {
1722 /* VARCONV didn't help. Clear it. */
1723 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1724 return 0;
1725 }
1726 out:
1727 sbi->s_last_block = lastblock;
1728 return 1;
1729 }
1730
1731 /*
1732 * Check Volume Structure Descriptor, find Anchor block and load Volume
1733 * Descriptor Sequence
1734 */
1735 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1736 int silent, struct kernel_lb_addr *fileset)
1737 {
1738 struct udf_sb_info *sbi = UDF_SB(sb);
1739 loff_t nsr_off;
1740
1741 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1742 if (!silent)
1743 printk(KERN_WARNING "UDF-fs: Bad block size\n");
1744 return 0;
1745 }
1746 sbi->s_last_block = uopt->lastblock;
1747 if (!uopt->novrs) {
1748 /* Check that it is NSR02 compliant */
1749 nsr_off = udf_check_vsd(sb);
1750 if (!nsr_off) {
1751 if (!silent)
1752 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1753 return 0;
1754 }
1755 if (nsr_off == -1)
1756 udf_debug("Failed to read byte 32768. Assuming open "
1757 "disc. Skipping validity check\n");
1758 if (!sbi->s_last_block)
1759 sbi->s_last_block = udf_get_last_block(sb);
1760 } else {
1761 udf_debug("Validity check skipped because of novrs option\n");
1762 }
1763
1764 /* Look for anchor block and load Volume Descriptor Sequence */
1765 sbi->s_anchor = uopt->anchor;
1766 if (!udf_find_anchor(sb, fileset)) {
1767 if (!silent)
1768 printk(KERN_WARNING "UDF-fs: No anchor found\n");
1769 return 0;
1770 }
1771 return 1;
1772 }
1773
1774 static void udf_open_lvid(struct super_block *sb)
1775 {
1776 struct udf_sb_info *sbi = UDF_SB(sb);
1777 struct buffer_head *bh = sbi->s_lvid_bh;
1778 struct logicalVolIntegrityDesc *lvid;
1779 struct logicalVolIntegrityDescImpUse *lvidiu;
1780
1781 if (!bh)
1782 return;
1783
1784 mutex_lock(&sbi->s_alloc_mutex);
1785 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1786 lvidiu = udf_sb_lvidiu(sbi);
1787
1788 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1789 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1790 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1791 CURRENT_TIME);
1792 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1793
1794 lvid->descTag.descCRC = cpu_to_le16(
1795 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1796 le16_to_cpu(lvid->descTag.descCRCLength)));
1797
1798 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1799 mark_buffer_dirty(bh);
1800 sbi->s_lvid_dirty = 0;
1801 mutex_unlock(&sbi->s_alloc_mutex);
1802 }
1803
1804 static void udf_close_lvid(struct super_block *sb)
1805 {
1806 struct udf_sb_info *sbi = UDF_SB(sb);
1807 struct buffer_head *bh = sbi->s_lvid_bh;
1808 struct logicalVolIntegrityDesc *lvid;
1809 struct logicalVolIntegrityDescImpUse *lvidiu;
1810
1811 if (!bh)
1812 return;
1813
1814 mutex_lock(&sbi->s_alloc_mutex);
1815 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1816 lvidiu = udf_sb_lvidiu(sbi);
1817 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1818 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1819 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1820 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1821 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1822 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1823 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1824 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1825 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1826 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1827
1828 lvid->descTag.descCRC = cpu_to_le16(
1829 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1830 le16_to_cpu(lvid->descTag.descCRCLength)));
1831
1832 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1833 mark_buffer_dirty(bh);
1834 sbi->s_lvid_dirty = 0;
1835 mutex_unlock(&sbi->s_alloc_mutex);
1836 }
1837
1838 u64 lvid_get_unique_id(struct super_block *sb)
1839 {
1840 struct buffer_head *bh;
1841 struct udf_sb_info *sbi = UDF_SB(sb);
1842 struct logicalVolIntegrityDesc *lvid;
1843 struct logicalVolHeaderDesc *lvhd;
1844 u64 uniqueID;
1845 u64 ret;
1846
1847 bh = sbi->s_lvid_bh;
1848 if (!bh)
1849 return 0;
1850
1851 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1852 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1853
1854 mutex_lock(&sbi->s_alloc_mutex);
1855 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1856 if (!(++uniqueID & 0xFFFFFFFF))
1857 uniqueID += 16;
1858 lvhd->uniqueID = cpu_to_le64(uniqueID);
1859 mutex_unlock(&sbi->s_alloc_mutex);
1860 mark_buffer_dirty(bh);
1861
1862 return ret;
1863 }
1864
1865 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1866 {
1867 int i;
1868 int nr_groups = bitmap->s_nr_groups;
1869 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1870 nr_groups);
1871
1872 for (i = 0; i < nr_groups; i++)
1873 if (bitmap->s_block_bitmap[i])
1874 brelse(bitmap->s_block_bitmap[i]);
1875
1876 if (size <= PAGE_SIZE)
1877 kfree(bitmap);
1878 else
1879 vfree(bitmap);
1880 }
1881
1882 static void udf_free_partition(struct udf_part_map *map)
1883 {
1884 int i;
1885 struct udf_meta_data *mdata;
1886
1887 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1888 iput(map->s_uspace.s_table);
1889 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1890 iput(map->s_fspace.s_table);
1891 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1892 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1893 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1894 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1895 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1896 for (i = 0; i < 4; i++)
1897 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1898 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1899 mdata = &map->s_type_specific.s_metadata;
1900 iput(mdata->s_metadata_fe);
1901 mdata->s_metadata_fe = NULL;
1902
1903 iput(mdata->s_mirror_fe);
1904 mdata->s_mirror_fe = NULL;
1905
1906 iput(mdata->s_bitmap_fe);
1907 mdata->s_bitmap_fe = NULL;
1908 }
1909 }
1910
1911 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1912 {
1913 int i;
1914 int ret;
1915 struct inode *inode = NULL;
1916 struct udf_options uopt;
1917 struct kernel_lb_addr rootdir, fileset;
1918 struct udf_sb_info *sbi;
1919
1920 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1921 uopt.uid = -1;
1922 uopt.gid = -1;
1923 uopt.umask = 0;
1924 uopt.fmode = UDF_INVALID_MODE;
1925 uopt.dmode = UDF_INVALID_MODE;
1926
1927 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1928 if (!sbi)
1929 return -ENOMEM;
1930
1931 sb->s_fs_info = sbi;
1932
1933 mutex_init(&sbi->s_alloc_mutex);
1934
1935 if (!udf_parse_options((char *)options, &uopt, false))
1936 goto error_out;
1937
1938 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1939 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1940 udf_error(sb, "udf_read_super",
1941 "utf8 cannot be combined with iocharset\n");
1942 goto error_out;
1943 }
1944 #ifdef CONFIG_UDF_NLS
1945 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1946 uopt.nls_map = load_nls_default();
1947 if (!uopt.nls_map)
1948 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1949 else
1950 udf_debug("Using default NLS map\n");
1951 }
1952 #endif
1953 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1954 uopt.flags |= (1 << UDF_FLAG_UTF8);
1955
1956 fileset.logicalBlockNum = 0xFFFFFFFF;
1957 fileset.partitionReferenceNum = 0xFFFF;
1958
1959 sbi->s_flags = uopt.flags;
1960 sbi->s_uid = uopt.uid;
1961 sbi->s_gid = uopt.gid;
1962 sbi->s_umask = uopt.umask;
1963 sbi->s_fmode = uopt.fmode;
1964 sbi->s_dmode = uopt.dmode;
1965 sbi->s_nls_map = uopt.nls_map;
1966 rwlock_init(&sbi->s_cred_lock);
1967
1968 if (uopt.session == 0xFFFFFFFF)
1969 sbi->s_session = udf_get_last_session(sb);
1970 else
1971 sbi->s_session = uopt.session;
1972
1973 udf_debug("Multi-session=%d\n", sbi->s_session);
1974
1975 /* Fill in the rest of the superblock */
1976 sb->s_op = &udf_sb_ops;
1977 sb->s_export_op = &udf_export_ops;
1978
1979 sb->s_dirt = 0;
1980 sb->s_magic = UDF_SUPER_MAGIC;
1981 sb->s_time_gran = 1000;
1982
1983 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1984 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1985 } else {
1986 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1987 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1988 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1989 if (!silent)
1990 printk(KERN_NOTICE
1991 "UDF-fs: Rescanning with blocksize "
1992 "%d\n", UDF_DEFAULT_BLOCKSIZE);
1993 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1994 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1995 }
1996 }
1997 if (!ret) {
1998 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1999 goto error_out;
2000 }
2001
2002 udf_debug("Lastblock=%d\n", sbi->s_last_block);
2003
2004 if (sbi->s_lvid_bh) {
2005 struct logicalVolIntegrityDescImpUse *lvidiu =
2006 udf_sb_lvidiu(sbi);
2007 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2008 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2009 /* uint16_t maxUDFWriteRev =
2010 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2011
2012 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2013 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
2014 "(max is %x)\n",
2015 le16_to_cpu(lvidiu->minUDFReadRev),
2016 UDF_MAX_READ_VERSION);
2017 goto error_out;
2018 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2019 sb->s_flags |= MS_RDONLY;
2020
2021 sbi->s_udfrev = minUDFWriteRev;
2022
2023 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2024 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2025 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2026 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2027 }
2028
2029 if (!sbi->s_partitions) {
2030 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
2031 goto error_out;
2032 }
2033
2034 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2035 UDF_PART_FLAG_READ_ONLY) {
2036 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2037 "forcing readonly mount\n");
2038 sb->s_flags |= MS_RDONLY;
2039 }
2040
2041 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2042 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2043 goto error_out;
2044 }
2045
2046 if (!silent) {
2047 struct timestamp ts;
2048 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2049 udf_info("UDF: Mounting volume '%s', "
2050 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2051 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2052 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2053 }
2054 if (!(sb->s_flags & MS_RDONLY))
2055 udf_open_lvid(sb);
2056
2057 /* Assign the root inode */
2058 /* assign inodes by physical block number */
2059 /* perhaps it's not extensible enough, but for now ... */
2060 inode = udf_iget(sb, &rootdir);
2061 if (!inode) {
2062 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2063 "partition=%d\n",
2064 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2065 goto error_out;
2066 }
2067
2068 /* Allocate a dentry for the root inode */
2069 sb->s_root = d_alloc_root(inode);
2070 if (!sb->s_root) {
2071 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2072 iput(inode);
2073 goto error_out;
2074 }
2075 sb->s_maxbytes = MAX_LFS_FILESIZE;
2076 return 0;
2077
2078 error_out:
2079 if (sbi->s_vat_inode)
2080 iput(sbi->s_vat_inode);
2081 if (sbi->s_partitions)
2082 for (i = 0; i < sbi->s_partitions; i++)
2083 udf_free_partition(&sbi->s_partmaps[i]);
2084 #ifdef CONFIG_UDF_NLS
2085 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2086 unload_nls(sbi->s_nls_map);
2087 #endif
2088 if (!(sb->s_flags & MS_RDONLY))
2089 udf_close_lvid(sb);
2090 brelse(sbi->s_lvid_bh);
2091
2092 kfree(sbi->s_partmaps);
2093 kfree(sbi);
2094 sb->s_fs_info = NULL;
2095
2096 return -EINVAL;
2097 }
2098
2099 static void udf_error(struct super_block *sb, const char *function,
2100 const char *fmt, ...)
2101 {
2102 va_list args;
2103
2104 if (!(sb->s_flags & MS_RDONLY)) {
2105 /* mark sb error */
2106 sb->s_dirt = 1;
2107 }
2108 va_start(args, fmt);
2109 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2110 va_end(args);
2111 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2112 sb->s_id, function, error_buf);
2113 }
2114
2115 void udf_warning(struct super_block *sb, const char *function,
2116 const char *fmt, ...)
2117 {
2118 va_list args;
2119
2120 va_start(args, fmt);
2121 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2122 va_end(args);
2123 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2124 sb->s_id, function, error_buf);
2125 }
2126
2127 static void udf_put_super(struct super_block *sb)
2128 {
2129 int i;
2130 struct udf_sb_info *sbi;
2131
2132 sbi = UDF_SB(sb);
2133
2134 if (sbi->s_vat_inode)
2135 iput(sbi->s_vat_inode);
2136 if (sbi->s_partitions)
2137 for (i = 0; i < sbi->s_partitions; i++)
2138 udf_free_partition(&sbi->s_partmaps[i]);
2139 #ifdef CONFIG_UDF_NLS
2140 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2141 unload_nls(sbi->s_nls_map);
2142 #endif
2143 if (!(sb->s_flags & MS_RDONLY))
2144 udf_close_lvid(sb);
2145 brelse(sbi->s_lvid_bh);
2146 kfree(sbi->s_partmaps);
2147 kfree(sb->s_fs_info);
2148 sb->s_fs_info = NULL;
2149 }
2150
2151 static int udf_sync_fs(struct super_block *sb, int wait)
2152 {
2153 struct udf_sb_info *sbi = UDF_SB(sb);
2154
2155 mutex_lock(&sbi->s_alloc_mutex);
2156 if (sbi->s_lvid_dirty) {
2157 /*
2158 * Blockdevice will be synced later so we don't have to submit
2159 * the buffer for IO
2160 */
2161 mark_buffer_dirty(sbi->s_lvid_bh);
2162 sb->s_dirt = 0;
2163 sbi->s_lvid_dirty = 0;
2164 }
2165 mutex_unlock(&sbi->s_alloc_mutex);
2166
2167 return 0;
2168 }
2169
2170 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2171 {
2172 struct super_block *sb = dentry->d_sb;
2173 struct udf_sb_info *sbi = UDF_SB(sb);
2174 struct logicalVolIntegrityDescImpUse *lvidiu;
2175 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2176
2177 if (sbi->s_lvid_bh != NULL)
2178 lvidiu = udf_sb_lvidiu(sbi);
2179 else
2180 lvidiu = NULL;
2181
2182 buf->f_type = UDF_SUPER_MAGIC;
2183 buf->f_bsize = sb->s_blocksize;
2184 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2185 buf->f_bfree = udf_count_free(sb);
2186 buf->f_bavail = buf->f_bfree;
2187 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2188 le32_to_cpu(lvidiu->numDirs)) : 0)
2189 + buf->f_bfree;
2190 buf->f_ffree = buf->f_bfree;
2191 buf->f_namelen = UDF_NAME_LEN - 2;
2192 buf->f_fsid.val[0] = (u32)id;
2193 buf->f_fsid.val[1] = (u32)(id >> 32);
2194
2195 return 0;
2196 }
2197
2198 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2199 struct udf_bitmap *bitmap)
2200 {
2201 struct buffer_head *bh = NULL;
2202 unsigned int accum = 0;
2203 int index;
2204 int block = 0, newblock;
2205 struct kernel_lb_addr loc;
2206 uint32_t bytes;
2207 uint8_t *ptr;
2208 uint16_t ident;
2209 struct spaceBitmapDesc *bm;
2210
2211 loc.logicalBlockNum = bitmap->s_extPosition;
2212 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2213 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2214
2215 if (!bh) {
2216 printk(KERN_ERR "udf: udf_count_free failed\n");
2217 goto out;
2218 } else if (ident != TAG_IDENT_SBD) {
2219 brelse(bh);
2220 printk(KERN_ERR "udf: udf_count_free failed\n");
2221 goto out;
2222 }
2223
2224 bm = (struct spaceBitmapDesc *)bh->b_data;
2225 bytes = le32_to_cpu(bm->numOfBytes);
2226 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2227 ptr = (uint8_t *)bh->b_data;
2228
2229 while (bytes > 0) {
2230 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2231 accum += bitmap_weight((const unsigned long *)(ptr + index),
2232 cur_bytes * 8);
2233 bytes -= cur_bytes;
2234 if (bytes) {
2235 brelse(bh);
2236 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2237 bh = udf_tread(sb, newblock);
2238 if (!bh) {
2239 udf_debug("read failed\n");
2240 goto out;
2241 }
2242 index = 0;
2243 ptr = (uint8_t *)bh->b_data;
2244 }
2245 }
2246 brelse(bh);
2247 out:
2248 return accum;
2249 }
2250
2251 static unsigned int udf_count_free_table(struct super_block *sb,
2252 struct inode *table)
2253 {
2254 unsigned int accum = 0;
2255 uint32_t elen;
2256 struct kernel_lb_addr eloc;
2257 int8_t etype;
2258 struct extent_position epos;
2259
2260 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2261 epos.block = UDF_I(table)->i_location;
2262 epos.offset = sizeof(struct unallocSpaceEntry);
2263 epos.bh = NULL;
2264
2265 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2266 accum += (elen >> table->i_sb->s_blocksize_bits);
2267
2268 brelse(epos.bh);
2269 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2270
2271 return accum;
2272 }
2273
2274 static unsigned int udf_count_free(struct super_block *sb)
2275 {
2276 unsigned int accum = 0;
2277 struct udf_sb_info *sbi;
2278 struct udf_part_map *map;
2279
2280 sbi = UDF_SB(sb);
2281 if (sbi->s_lvid_bh) {
2282 struct logicalVolIntegrityDesc *lvid =
2283 (struct logicalVolIntegrityDesc *)
2284 sbi->s_lvid_bh->b_data;
2285 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2286 accum = le32_to_cpu(
2287 lvid->freeSpaceTable[sbi->s_partition]);
2288 if (accum == 0xFFFFFFFF)
2289 accum = 0;
2290 }
2291 }
2292
2293 if (accum)
2294 return accum;
2295
2296 map = &sbi->s_partmaps[sbi->s_partition];
2297 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2298 accum += udf_count_free_bitmap(sb,
2299 map->s_uspace.s_bitmap);
2300 }
2301 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2302 accum += udf_count_free_bitmap(sb,
2303 map->s_fspace.s_bitmap);
2304 }
2305 if (accum)
2306 return accum;
2307
2308 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2309 accum += udf_count_free_table(sb,
2310 map->s_uspace.s_table);
2311 }
2312 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2313 accum += udf_count_free_table(sb,
2314 map->s_fspace.s_table);
2315 }
2316
2317 return accum;
2318 }
Linux with added FPC-III support