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gspca: Fix falling back to lower isoc alt settings
[zen-stable.git] / fs / udf / super.c
blobe185253470dfa71725f4dc33ebc78463805908d9
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 /* These are the "meat" - everything else is stuffing */
79 static int udf_fill_super(struct super_block *, void *, int);
80 static void udf_put_super(struct super_block *);
81 static int udf_sync_fs(struct super_block *, int);
82 static int udf_remount_fs(struct super_block *, int *, char *);
83 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
84 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
85 struct kernel_lb_addr *);
86 static void udf_load_fileset(struct super_block *, struct buffer_head *,
87 struct kernel_lb_addr *);
88 static void udf_open_lvid(struct super_block *);
89 static void udf_close_lvid(struct super_block *);
90 static unsigned int udf_count_free(struct super_block *);
91 static int udf_statfs(struct dentry *, struct kstatfs *);
92 static int udf_show_options(struct seq_file *, struct vfsmount *);
93
94 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
95 {
96 struct logicalVolIntegrityDesc *lvid =
97 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
98 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
99 __u32 offset = number_of_partitions * 2 *
100 sizeof(uint32_t)/sizeof(uint8_t);
101 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
102 }
103
104 /* UDF filesystem type */
105 static struct dentry *udf_mount(struct file_system_type *fs_type,
106 int flags, const char *dev_name, void *data)
107 {
108 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
109 }
110
111 static struct file_system_type udf_fstype = {
112 .owner = THIS_MODULE,
113 .name = "udf",
114 .mount = udf_mount,
115 .kill_sb = kill_block_super,
116 .fs_flags = FS_REQUIRES_DEV,
117 };
118
119 static struct kmem_cache *udf_inode_cachep;
120
121 static struct inode *udf_alloc_inode(struct super_block *sb)
122 {
123 struct udf_inode_info *ei;
124 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
125 if (!ei)
126 return NULL;
127
128 ei->i_unique = 0;
129 ei->i_lenExtents = 0;
130 ei->i_next_alloc_block = 0;
131 ei->i_next_alloc_goal = 0;
132 ei->i_strat4096 = 0;
133 init_rwsem(&ei->i_data_sem);
134
135 return &ei->vfs_inode;
136 }
137
138 static void udf_i_callback(struct rcu_head *head)
139 {
140 struct inode *inode = container_of(head, struct inode, i_rcu);
141 INIT_LIST_HEAD(&inode->i_dentry);
142 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
143 }
144
145 static void udf_destroy_inode(struct inode *inode)
146 {
147 call_rcu(&inode->i_rcu, udf_i_callback);
148 }
149
150 static void init_once(void *foo)
151 {
152 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
153
154 ei->i_ext.i_data = NULL;
155 inode_init_once(&ei->vfs_inode);
156 }
157
158 static int init_inodecache(void)
159 {
160 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
161 sizeof(struct udf_inode_info),
162 0, (SLAB_RECLAIM_ACCOUNT |
163 SLAB_MEM_SPREAD),
164 init_once);
165 if (!udf_inode_cachep)
166 return -ENOMEM;
167 return 0;
168 }
169
170 static void destroy_inodecache(void)
171 {
172 kmem_cache_destroy(udf_inode_cachep);
173 }
174
175 /* Superblock operations */
176 static const struct super_operations udf_sb_ops = {
177 .alloc_inode = udf_alloc_inode,
178 .destroy_inode = udf_destroy_inode,
179 .write_inode = udf_write_inode,
180 .evict_inode = udf_evict_inode,
181 .put_super = udf_put_super,
182 .sync_fs = udf_sync_fs,
183 .statfs = udf_statfs,
184 .remount_fs = udf_remount_fs,
185 .show_options = udf_show_options,
186 };
187
188 struct udf_options {
189 unsigned char novrs;
190 unsigned int blocksize;
191 unsigned int session;
192 unsigned int lastblock;
193 unsigned int anchor;
194 unsigned int volume;
195 unsigned short partition;
196 unsigned int fileset;
197 unsigned int rootdir;
198 unsigned int flags;
199 mode_t umask;
200 gid_t gid;
201 uid_t uid;
202 mode_t fmode;
203 mode_t dmode;
204 struct nls_table *nls_map;
205 };
206
207 static int __init init_udf_fs(void)
208 {
209 int err;
210
211 err = init_inodecache();
212 if (err)
213 goto out1;
214 err = register_filesystem(&udf_fstype);
215 if (err)
216 goto out;
217
218 return 0;
219
220 out:
221 destroy_inodecache();
222
223 out1:
224 return err;
225 }
226
227 static void __exit exit_udf_fs(void)
228 {
229 unregister_filesystem(&udf_fstype);
230 destroy_inodecache();
231 }
232
233 module_init(init_udf_fs)
234 module_exit(exit_udf_fs)
235
236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
237 {
238 struct udf_sb_info *sbi = UDF_SB(sb);
239
240 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
241 GFP_KERNEL);
242 if (!sbi->s_partmaps) {
243 udf_err(sb, "Unable to allocate space for %d partition maps\n",
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 pr_err("bad mount option \"%s\" or missing value\n", p);
549 return 0;
550 }
551 }
552 return 1;
553 }
554
555 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
556 {
557 struct udf_options uopt;
558 struct udf_sb_info *sbi = UDF_SB(sb);
559 int error = 0;
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 write_lock(&sbi->s_cred_lock);
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 write_unlock(&sbi->s_cred_lock);
579
580 if (sbi->s_lvid_bh) {
581 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
582 if (write_rev > UDF_MAX_WRITE_VERSION)
583 *flags |= MS_RDONLY;
584 }
585
586 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
587 goto out_unlock;
588
589 if (*flags & MS_RDONLY)
590 udf_close_lvid(sb);
591 else
592 udf_open_lvid(sb);
593
594 out_unlock:
595 return error;
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 found\n");
643 break;
644 case 2:
645 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
646 break;
647 case 3:
648 udf_debug("ISO9660 Volume Partition Descriptor found\n");
649 break;
650 case 255:
651 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
652 break;
653 default:
654 udf_debug("ISO9660 VRS (%u) found\n",
655 vsd->structType);
656 break;
657 }
658 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
659 VSD_STD_ID_LEN))
660 ; /* nothing */
661 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
662 VSD_STD_ID_LEN)) {
663 brelse(bh);
664 break;
665 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
666 VSD_STD_ID_LEN))
667 nsr02 = sector;
668 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
669 VSD_STD_ID_LEN))
670 nsr03 = sector;
671 brelse(bh);
672 }
673
674 if (nsr03)
675 return nsr03;
676 else if (nsr02)
677 return nsr02;
678 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
679 return -1;
680 else
681 return 0;
682 }
683
684 static int udf_find_fileset(struct super_block *sb,
685 struct kernel_lb_addr *fileset,
686 struct kernel_lb_addr *root)
687 {
688 struct buffer_head *bh = NULL;
689 long lastblock;
690 uint16_t ident;
691 struct udf_sb_info *sbi;
692
693 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
694 fileset->partitionReferenceNum != 0xFFFF) {
695 bh = udf_read_ptagged(sb, fileset, 0, &ident);
696
697 if (!bh) {
698 return 1;
699 } else if (ident != TAG_IDENT_FSD) {
700 brelse(bh);
701 return 1;
702 }
703
704 }
705
706 sbi = UDF_SB(sb);
707 if (!bh) {
708 /* Search backwards through the partitions */
709 struct kernel_lb_addr newfileset;
710
711 /* --> cvg: FIXME - is it reasonable? */
712 return 1;
713
714 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
715 (newfileset.partitionReferenceNum != 0xFFFF &&
716 fileset->logicalBlockNum == 0xFFFFFFFF &&
717 fileset->partitionReferenceNum == 0xFFFF);
718 newfileset.partitionReferenceNum--) {
719 lastblock = sbi->s_partmaps
720 [newfileset.partitionReferenceNum]
721 .s_partition_len;
722 newfileset.logicalBlockNum = 0;
723
724 do {
725 bh = udf_read_ptagged(sb, &newfileset, 0,
726 &ident);
727 if (!bh) {
728 newfileset.logicalBlockNum++;
729 continue;
730 }
731
732 switch (ident) {
733 case TAG_IDENT_SBD:
734 {
735 struct spaceBitmapDesc *sp;
736 sp = (struct spaceBitmapDesc *)
737 bh->b_data;
738 newfileset.logicalBlockNum += 1 +
739 ((le32_to_cpu(sp->numOfBytes) +
740 sizeof(struct spaceBitmapDesc)
741 - 1) >> sb->s_blocksize_bits);
742 brelse(bh);
743 break;
744 }
745 case TAG_IDENT_FSD:
746 *fileset = newfileset;
747 break;
748 default:
749 newfileset.logicalBlockNum++;
750 brelse(bh);
751 bh = NULL;
752 break;
753 }
754 } while (newfileset.logicalBlockNum < lastblock &&
755 fileset->logicalBlockNum == 0xFFFFFFFF &&
756 fileset->partitionReferenceNum == 0xFFFF);
757 }
758 }
759
760 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
761 fileset->partitionReferenceNum != 0xFFFF) && bh) {
762 udf_debug("Fileset at block=%d, partition=%d\n",
763 fileset->logicalBlockNum,
764 fileset->partitionReferenceNum);
765
766 sbi->s_partition = fileset->partitionReferenceNum;
767 udf_load_fileset(sb, bh, root);
768 brelse(bh);
769 return 0;
770 }
771 return 1;
772 }
773
774 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
775 {
776 struct primaryVolDesc *pvoldesc;
777 struct ustr *instr, *outstr;
778 struct buffer_head *bh;
779 uint16_t ident;
780 int ret = 1;
781
782 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
783 if (!instr)
784 return 1;
785
786 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
787 if (!outstr)
788 goto out1;
789
790 bh = udf_read_tagged(sb, block, block, &ident);
791 if (!bh)
792 goto out2;
793
794 BUG_ON(ident != TAG_IDENT_PVD);
795
796 pvoldesc = (struct primaryVolDesc *)bh->b_data;
797
798 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
799 pvoldesc->recordingDateAndTime)) {
800 #ifdef UDFFS_DEBUG
801 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
802 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
803 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
804 ts->minute, le16_to_cpu(ts->typeAndTimezone));
805 #endif
806 }
807
808 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
809 if (udf_CS0toUTF8(outstr, instr)) {
810 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
811 outstr->u_len > 31 ? 31 : outstr->u_len);
812 udf_debug("volIdent[] = '%s'\n",
813 UDF_SB(sb)->s_volume_ident);
814 }
815
816 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
817 if (udf_CS0toUTF8(outstr, instr))
818 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
819
820 brelse(bh);
821 ret = 0;
822 out2:
823 kfree(outstr);
824 out1:
825 kfree(instr);
826 return ret;
827 }
828
829 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
830 u32 meta_file_loc, u32 partition_num)
831 {
832 struct kernel_lb_addr addr;
833 struct inode *metadata_fe;
834
835 addr.logicalBlockNum = meta_file_loc;
836 addr.partitionReferenceNum = partition_num;
837
838 metadata_fe = udf_iget(sb, &addr);
839
840 if (metadata_fe == NULL)
841 udf_warn(sb, "metadata inode efe not found\n");
842 else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
843 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
844 iput(metadata_fe);
845 metadata_fe = NULL;
846 }
847
848 return metadata_fe;
849 }
850
851 static int udf_load_metadata_files(struct super_block *sb, int partition)
852 {
853 struct udf_sb_info *sbi = UDF_SB(sb);
854 struct udf_part_map *map;
855 struct udf_meta_data *mdata;
856 struct kernel_lb_addr addr;
857
858 map = &sbi->s_partmaps[partition];
859 mdata = &map->s_type_specific.s_metadata;
860
861 /* metadata address */
862 udf_debug("Metadata file location: block = %d part = %d\n",
863 mdata->s_meta_file_loc, map->s_partition_num);
864
865 mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
866 mdata->s_meta_file_loc, map->s_partition_num);
867
868 if (mdata->s_metadata_fe == NULL) {
869 /* mirror file entry */
870 udf_debug("Mirror metadata file location: block = %d part = %d\n",
871 mdata->s_mirror_file_loc, map->s_partition_num);
872
873 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
874 mdata->s_mirror_file_loc, map->s_partition_num);
875
876 if (mdata->s_mirror_fe == NULL) {
877 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
878 goto error_exit;
879 }
880 }
881
882 /*
883 * bitmap file entry
884 * Note:
885 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
886 */
887 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
888 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
889 addr.partitionReferenceNum = map->s_partition_num;
890
891 udf_debug("Bitmap file location: block = %d part = %d\n",
892 addr.logicalBlockNum, addr.partitionReferenceNum);
893
894 mdata->s_bitmap_fe = udf_iget(sb, &addr);
895
896 if (mdata->s_bitmap_fe == NULL) {
897 if (sb->s_flags & MS_RDONLY)
898 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
899 else {
900 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
901 goto error_exit;
902 }
903 }
904 }
905
906 udf_debug("udf_load_metadata_files Ok\n");
907
908 return 0;
909
910 error_exit:
911 return 1;
912 }
913
914 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
915 struct kernel_lb_addr *root)
916 {
917 struct fileSetDesc *fset;
918
919 fset = (struct fileSetDesc *)bh->b_data;
920
921 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
922
923 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
924
925 udf_debug("Rootdir at block=%d, partition=%d\n",
926 root->logicalBlockNum, root->partitionReferenceNum);
927 }
928
929 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
930 {
931 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
932 return DIV_ROUND_UP(map->s_partition_len +
933 (sizeof(struct spaceBitmapDesc) << 3),
934 sb->s_blocksize * 8);
935 }
936
937 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
938 {
939 struct udf_bitmap *bitmap;
940 int nr_groups;
941 int size;
942
943 nr_groups = udf_compute_nr_groups(sb, index);
944 size = sizeof(struct udf_bitmap) +
945 (sizeof(struct buffer_head *) * nr_groups);
946
947 if (size <= PAGE_SIZE)
948 bitmap = kzalloc(size, GFP_KERNEL);
949 else
950 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
951
952 if (bitmap == NULL) {
953 udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
954 nr_groups);
955 return NULL;
956 }
957
958 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
959 bitmap->s_nr_groups = nr_groups;
960 return bitmap;
961 }
962
963 static int udf_fill_partdesc_info(struct super_block *sb,
964 struct partitionDesc *p, int p_index)
965 {
966 struct udf_part_map *map;
967 struct udf_sb_info *sbi = UDF_SB(sb);
968 struct partitionHeaderDesc *phd;
969
970 map = &sbi->s_partmaps[p_index];
971
972 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
973 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
974
975 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
976 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
977 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
978 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
979 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
980 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
981 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
982 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
983
984 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
985 p_index, map->s_partition_type,
986 map->s_partition_root, map->s_partition_len);
987
988 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
989 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
990 return 0;
991
992 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
993 if (phd->unallocSpaceTable.extLength) {
994 struct kernel_lb_addr loc = {
995 .logicalBlockNum = le32_to_cpu(
996 phd->unallocSpaceTable.extPosition),
997 .partitionReferenceNum = p_index,
998 };
999
1000 map->s_uspace.s_table = udf_iget(sb, &loc);
1001 if (!map->s_uspace.s_table) {
1002 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1003 p_index);
1004 return 1;
1005 }
1006 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1007 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1008 p_index, map->s_uspace.s_table->i_ino);
1009 }
1010
1011 if (phd->unallocSpaceBitmap.extLength) {
1012 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1013 if (!bitmap)
1014 return 1;
1015 map->s_uspace.s_bitmap = bitmap;
1016 bitmap->s_extLength = le32_to_cpu(
1017 phd->unallocSpaceBitmap.extLength);
1018 bitmap->s_extPosition = le32_to_cpu(
1019 phd->unallocSpaceBitmap.extPosition);
1020 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1021 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1022 p_index, bitmap->s_extPosition);
1023 }
1024
1025 if (phd->partitionIntegrityTable.extLength)
1026 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1027
1028 if (phd->freedSpaceTable.extLength) {
1029 struct kernel_lb_addr loc = {
1030 .logicalBlockNum = le32_to_cpu(
1031 phd->freedSpaceTable.extPosition),
1032 .partitionReferenceNum = p_index,
1033 };
1034
1035 map->s_fspace.s_table = udf_iget(sb, &loc);
1036 if (!map->s_fspace.s_table) {
1037 udf_debug("cannot load freedSpaceTable (part %d)\n",
1038 p_index);
1039 return 1;
1040 }
1041
1042 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1043 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1044 p_index, map->s_fspace.s_table->i_ino);
1045 }
1046
1047 if (phd->freedSpaceBitmap.extLength) {
1048 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1049 if (!bitmap)
1050 return 1;
1051 map->s_fspace.s_bitmap = bitmap;
1052 bitmap->s_extLength = le32_to_cpu(
1053 phd->freedSpaceBitmap.extLength);
1054 bitmap->s_extPosition = le32_to_cpu(
1055 phd->freedSpaceBitmap.extPosition);
1056 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1057 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1058 p_index, bitmap->s_extPosition);
1059 }
1060 return 0;
1061 }
1062
1063 static void udf_find_vat_block(struct super_block *sb, int p_index,
1064 int type1_index, sector_t start_block)
1065 {
1066 struct udf_sb_info *sbi = UDF_SB(sb);
1067 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1068 sector_t vat_block;
1069 struct kernel_lb_addr ino;
1070
1071 /*
1072 * VAT file entry is in the last recorded block. Some broken disks have
1073 * it a few blocks before so try a bit harder...
1074 */
1075 ino.partitionReferenceNum = type1_index;
1076 for (vat_block = start_block;
1077 vat_block >= map->s_partition_root &&
1078 vat_block >= start_block - 3 &&
1079 !sbi->s_vat_inode; vat_block--) {
1080 ino.logicalBlockNum = vat_block - map->s_partition_root;
1081 sbi->s_vat_inode = udf_iget(sb, &ino);
1082 }
1083 }
1084
1085 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1086 {
1087 struct udf_sb_info *sbi = UDF_SB(sb);
1088 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1089 struct buffer_head *bh = NULL;
1090 struct udf_inode_info *vati;
1091 uint32_t pos;
1092 struct virtualAllocationTable20 *vat20;
1093 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1094
1095 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1096 if (!sbi->s_vat_inode &&
1097 sbi->s_last_block != blocks - 1) {
1098 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1099 (unsigned long)sbi->s_last_block,
1100 (unsigned long)blocks - 1);
1101 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1102 }
1103 if (!sbi->s_vat_inode)
1104 return 1;
1105
1106 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1107 map->s_type_specific.s_virtual.s_start_offset = 0;
1108 map->s_type_specific.s_virtual.s_num_entries =
1109 (sbi->s_vat_inode->i_size - 36) >> 2;
1110 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1111 vati = UDF_I(sbi->s_vat_inode);
1112 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1113 pos = udf_block_map(sbi->s_vat_inode, 0);
1114 bh = sb_bread(sb, pos);
1115 if (!bh)
1116 return 1;
1117 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1118 } else {
1119 vat20 = (struct virtualAllocationTable20 *)
1120 vati->i_ext.i_data;
1121 }
1122
1123 map->s_type_specific.s_virtual.s_start_offset =
1124 le16_to_cpu(vat20->lengthHeader);
1125 map->s_type_specific.s_virtual.s_num_entries =
1126 (sbi->s_vat_inode->i_size -
1127 map->s_type_specific.s_virtual.
1128 s_start_offset) >> 2;
1129 brelse(bh);
1130 }
1131 return 0;
1132 }
1133
1134 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1135 {
1136 struct buffer_head *bh;
1137 struct partitionDesc *p;
1138 struct udf_part_map *map;
1139 struct udf_sb_info *sbi = UDF_SB(sb);
1140 int i, type1_idx;
1141 uint16_t partitionNumber;
1142 uint16_t ident;
1143 int ret = 0;
1144
1145 bh = udf_read_tagged(sb, block, block, &ident);
1146 if (!bh)
1147 return 1;
1148 if (ident != TAG_IDENT_PD)
1149 goto out_bh;
1150
1151 p = (struct partitionDesc *)bh->b_data;
1152 partitionNumber = le16_to_cpu(p->partitionNumber);
1153
1154 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1155 for (i = 0; i < sbi->s_partitions; i++) {
1156 map = &sbi->s_partmaps[i];
1157 udf_debug("Searching map: (%d == %d)\n",
1158 map->s_partition_num, partitionNumber);
1159 if (map->s_partition_num == partitionNumber &&
1160 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1161 map->s_partition_type == UDF_SPARABLE_MAP15))
1162 break;
1163 }
1164
1165 if (i >= sbi->s_partitions) {
1166 udf_debug("Partition (%d) not found in partition map\n",
1167 partitionNumber);
1168 goto out_bh;
1169 }
1170
1171 ret = udf_fill_partdesc_info(sb, p, i);
1172
1173 /*
1174 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1175 * PHYSICAL partitions are already set up
1176 */
1177 type1_idx = i;
1178 for (i = 0; i < sbi->s_partitions; i++) {
1179 map = &sbi->s_partmaps[i];
1180
1181 if (map->s_partition_num == partitionNumber &&
1182 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1183 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1184 map->s_partition_type == UDF_METADATA_MAP25))
1185 break;
1186 }
1187
1188 if (i >= sbi->s_partitions)
1189 goto out_bh;
1190
1191 ret = udf_fill_partdesc_info(sb, p, i);
1192 if (ret)
1193 goto out_bh;
1194
1195 if (map->s_partition_type == UDF_METADATA_MAP25) {
1196 ret = udf_load_metadata_files(sb, i);
1197 if (ret) {
1198 udf_err(sb, "error loading MetaData partition map %d\n",
1199 i);
1200 goto out_bh;
1201 }
1202 } else {
1203 ret = udf_load_vat(sb, i, type1_idx);
1204 if (ret)
1205 goto out_bh;
1206 /*
1207 * Mark filesystem read-only if we have a partition with
1208 * virtual map since we don't handle writing to it (we
1209 * overwrite blocks instead of relocating them).
1210 */
1211 sb->s_flags |= MS_RDONLY;
1212 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1213 }
1214 out_bh:
1215 /* In case loading failed, we handle cleanup in udf_fill_super */
1216 brelse(bh);
1217 return ret;
1218 }
1219
1220 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1221 struct kernel_lb_addr *fileset)
1222 {
1223 struct logicalVolDesc *lvd;
1224 int i, j, offset;
1225 uint8_t type;
1226 struct udf_sb_info *sbi = UDF_SB(sb);
1227 struct genericPartitionMap *gpm;
1228 uint16_t ident;
1229 struct buffer_head *bh;
1230 int ret = 0;
1231
1232 bh = udf_read_tagged(sb, block, block, &ident);
1233 if (!bh)
1234 return 1;
1235 BUG_ON(ident != TAG_IDENT_LVD);
1236 lvd = (struct logicalVolDesc *)bh->b_data;
1237
1238 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1239 if (i != 0) {
1240 ret = i;
1241 goto out_bh;
1242 }
1243
1244 for (i = 0, offset = 0;
1245 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1246 i++, offset += gpm->partitionMapLength) {
1247 struct udf_part_map *map = &sbi->s_partmaps[i];
1248 gpm = (struct genericPartitionMap *)
1249 &(lvd->partitionMaps[offset]);
1250 type = gpm->partitionMapType;
1251 if (type == 1) {
1252 struct genericPartitionMap1 *gpm1 =
1253 (struct genericPartitionMap1 *)gpm;
1254 map->s_partition_type = UDF_TYPE1_MAP15;
1255 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1256 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1257 map->s_partition_func = NULL;
1258 } else if (type == 2) {
1259 struct udfPartitionMap2 *upm2 =
1260 (struct udfPartitionMap2 *)gpm;
1261 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1262 strlen(UDF_ID_VIRTUAL))) {
1263 u16 suf =
1264 le16_to_cpu(((__le16 *)upm2->partIdent.
1265 identSuffix)[0]);
1266 if (suf < 0x0200) {
1267 map->s_partition_type =
1268 UDF_VIRTUAL_MAP15;
1269 map->s_partition_func =
1270 udf_get_pblock_virt15;
1271 } else {
1272 map->s_partition_type =
1273 UDF_VIRTUAL_MAP20;
1274 map->s_partition_func =
1275 udf_get_pblock_virt20;
1276 }
1277 } else if (!strncmp(upm2->partIdent.ident,
1278 UDF_ID_SPARABLE,
1279 strlen(UDF_ID_SPARABLE))) {
1280 uint32_t loc;
1281 struct sparingTable *st;
1282 struct sparablePartitionMap *spm =
1283 (struct sparablePartitionMap *)gpm;
1284
1285 map->s_partition_type = UDF_SPARABLE_MAP15;
1286 map->s_type_specific.s_sparing.s_packet_len =
1287 le16_to_cpu(spm->packetLength);
1288 for (j = 0; j < spm->numSparingTables; j++) {
1289 struct buffer_head *bh2;
1290
1291 loc = le32_to_cpu(
1292 spm->locSparingTable[j]);
1293 bh2 = udf_read_tagged(sb, loc, loc,
1294 &ident);
1295 map->s_type_specific.s_sparing.
1296 s_spar_map[j] = bh2;
1297
1298 if (bh2 == NULL)
1299 continue;
1300
1301 st = (struct sparingTable *)bh2->b_data;
1302 if (ident != 0 || strncmp(
1303 st->sparingIdent.ident,
1304 UDF_ID_SPARING,
1305 strlen(UDF_ID_SPARING))) {
1306 brelse(bh2);
1307 map->s_type_specific.s_sparing.
1308 s_spar_map[j] = NULL;
1309 }
1310 }
1311 map->s_partition_func = udf_get_pblock_spar15;
1312 } else if (!strncmp(upm2->partIdent.ident,
1313 UDF_ID_METADATA,
1314 strlen(UDF_ID_METADATA))) {
1315 struct udf_meta_data *mdata =
1316 &map->s_type_specific.s_metadata;
1317 struct metadataPartitionMap *mdm =
1318 (struct metadataPartitionMap *)
1319 &(lvd->partitionMaps[offset]);
1320 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1321 i, type, UDF_ID_METADATA);
1322
1323 map->s_partition_type = UDF_METADATA_MAP25;
1324 map->s_partition_func = udf_get_pblock_meta25;
1325
1326 mdata->s_meta_file_loc =
1327 le32_to_cpu(mdm->metadataFileLoc);
1328 mdata->s_mirror_file_loc =
1329 le32_to_cpu(mdm->metadataMirrorFileLoc);
1330 mdata->s_bitmap_file_loc =
1331 le32_to_cpu(mdm->metadataBitmapFileLoc);
1332 mdata->s_alloc_unit_size =
1333 le32_to_cpu(mdm->allocUnitSize);
1334 mdata->s_align_unit_size =
1335 le16_to_cpu(mdm->alignUnitSize);
1336 if (mdm->flags & 0x01)
1337 mdata->s_flags |= MF_DUPLICATE_MD;
1338
1339 udf_debug("Metadata Ident suffix=0x%x\n",
1340 le16_to_cpu(*(__le16 *)
1341 mdm->partIdent.identSuffix));
1342 udf_debug("Metadata part num=%d\n",
1343 le16_to_cpu(mdm->partitionNum));
1344 udf_debug("Metadata part alloc unit size=%d\n",
1345 le32_to_cpu(mdm->allocUnitSize));
1346 udf_debug("Metadata file loc=%d\n",
1347 le32_to_cpu(mdm->metadataFileLoc));
1348 udf_debug("Mirror file loc=%d\n",
1349 le32_to_cpu(mdm->metadataMirrorFileLoc));
1350 udf_debug("Bitmap file loc=%d\n",
1351 le32_to_cpu(mdm->metadataBitmapFileLoc));
1352 udf_debug("Flags: %d %d\n",
1353 mdata->s_flags, mdm->flags);
1354 } else {
1355 udf_debug("Unknown ident: %s\n",
1356 upm2->partIdent.ident);
1357 continue;
1358 }
1359 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1360 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1361 }
1362 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1363 i, map->s_partition_num, type, map->s_volumeseqnum);
1364 }
1365
1366 if (fileset) {
1367 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1368
1369 *fileset = lelb_to_cpu(la->extLocation);
1370 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1371 fileset->logicalBlockNum,
1372 fileset->partitionReferenceNum);
1373 }
1374 if (lvd->integritySeqExt.extLength)
1375 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1376
1377 out_bh:
1378 brelse(bh);
1379 return ret;
1380 }
1381
1382 /*
1383 * udf_load_logicalvolint
1384 *
1385 */
1386 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1387 {
1388 struct buffer_head *bh = NULL;
1389 uint16_t ident;
1390 struct udf_sb_info *sbi = UDF_SB(sb);
1391 struct logicalVolIntegrityDesc *lvid;
1392
1393 while (loc.extLength > 0 &&
1394 (bh = udf_read_tagged(sb, loc.extLocation,
1395 loc.extLocation, &ident)) &&
1396 ident == TAG_IDENT_LVID) {
1397 sbi->s_lvid_bh = bh;
1398 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1399
1400 if (lvid->nextIntegrityExt.extLength)
1401 udf_load_logicalvolint(sb,
1402 leea_to_cpu(lvid->nextIntegrityExt));
1403
1404 if (sbi->s_lvid_bh != bh)
1405 brelse(bh);
1406 loc.extLength -= sb->s_blocksize;
1407 loc.extLocation++;
1408 }
1409 if (sbi->s_lvid_bh != bh)
1410 brelse(bh);
1411 }
1412
1413 /*
1414 * udf_process_sequence
1415 *
1416 * PURPOSE
1417 * Process a main/reserve volume descriptor sequence.
1418 *
1419 * PRE-CONDITIONS
1420 * sb Pointer to _locked_ superblock.
1421 * block First block of first extent of the sequence.
1422 * lastblock Lastblock of first extent of the sequence.
1423 *
1424 * HISTORY
1425 * July 1, 1997 - Andrew E. Mileski
1426 * Written, tested, and released.
1427 */
1428 static noinline int udf_process_sequence(struct super_block *sb, long block,
1429 long lastblock, struct kernel_lb_addr *fileset)
1430 {
1431 struct buffer_head *bh = NULL;
1432 struct udf_vds_record vds[VDS_POS_LENGTH];
1433 struct udf_vds_record *curr;
1434 struct generic_desc *gd;
1435 struct volDescPtr *vdp;
1436 int done = 0;
1437 uint32_t vdsn;
1438 uint16_t ident;
1439 long next_s = 0, next_e = 0;
1440
1441 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1442
1443 /*
1444 * Read the main descriptor sequence and find which descriptors
1445 * are in it.
1446 */
1447 for (; (!done && block <= lastblock); block++) {
1448
1449 bh = udf_read_tagged(sb, block, block, &ident);
1450 if (!bh) {
1451 udf_err(sb,
1452 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1453 (unsigned long long)block);
1454 return 1;
1455 }
1456
1457 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1458 gd = (struct generic_desc *)bh->b_data;
1459 vdsn = le32_to_cpu(gd->volDescSeqNum);
1460 switch (ident) {
1461 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1462 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1463 if (vdsn >= curr->volDescSeqNum) {
1464 curr->volDescSeqNum = vdsn;
1465 curr->block = block;
1466 }
1467 break;
1468 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1469 curr = &vds[VDS_POS_VOL_DESC_PTR];
1470 if (vdsn >= curr->volDescSeqNum) {
1471 curr->volDescSeqNum = vdsn;
1472 curr->block = block;
1473
1474 vdp = (struct volDescPtr *)bh->b_data;
1475 next_s = le32_to_cpu(
1476 vdp->nextVolDescSeqExt.extLocation);
1477 next_e = le32_to_cpu(
1478 vdp->nextVolDescSeqExt.extLength);
1479 next_e = next_e >> sb->s_blocksize_bits;
1480 next_e += next_s;
1481 }
1482 break;
1483 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1484 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1485 if (vdsn >= curr->volDescSeqNum) {
1486 curr->volDescSeqNum = vdsn;
1487 curr->block = block;
1488 }
1489 break;
1490 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1491 curr = &vds[VDS_POS_PARTITION_DESC];
1492 if (!curr->block)
1493 curr->block = block;
1494 break;
1495 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1496 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1497 if (vdsn >= curr->volDescSeqNum) {
1498 curr->volDescSeqNum = vdsn;
1499 curr->block = block;
1500 }
1501 break;
1502 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1503 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1504 if (vdsn >= curr->volDescSeqNum) {
1505 curr->volDescSeqNum = vdsn;
1506 curr->block = block;
1507 }
1508 break;
1509 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1510 vds[VDS_POS_TERMINATING_DESC].block = block;
1511 if (next_e) {
1512 block = next_s;
1513 lastblock = next_e;
1514 next_s = next_e = 0;
1515 } else
1516 done = 1;
1517 break;
1518 }
1519 brelse(bh);
1520 }
1521 /*
1522 * Now read interesting descriptors again and process them
1523 * in a suitable order
1524 */
1525 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1526 udf_err(sb, "Primary Volume Descriptor not found!\n");
1527 return 1;
1528 }
1529 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1530 return 1;
1531
1532 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1533 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1534 return 1;
1535
1536 if (vds[VDS_POS_PARTITION_DESC].block) {
1537 /*
1538 * We rescan the whole descriptor sequence to find
1539 * partition descriptor blocks and process them.
1540 */
1541 for (block = vds[VDS_POS_PARTITION_DESC].block;
1542 block < vds[VDS_POS_TERMINATING_DESC].block;
1543 block++)
1544 if (udf_load_partdesc(sb, block))
1545 return 1;
1546 }
1547
1548 return 0;
1549 }
1550
1551 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1552 struct kernel_lb_addr *fileset)
1553 {
1554 struct anchorVolDescPtr *anchor;
1555 long main_s, main_e, reserve_s, reserve_e;
1556
1557 anchor = (struct anchorVolDescPtr *)bh->b_data;
1558
1559 /* Locate the main sequence */
1560 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1561 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1562 main_e = main_e >> sb->s_blocksize_bits;
1563 main_e += main_s;
1564
1565 /* Locate the reserve sequence */
1566 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1567 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1568 reserve_e = reserve_e >> sb->s_blocksize_bits;
1569 reserve_e += reserve_s;
1570
1571 /* Process the main & reserve sequences */
1572 /* responsible for finding the PartitionDesc(s) */
1573 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1574 return 1;
1575 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1576 }
1577
1578 /*
1579 * Check whether there is an anchor block in the given block and
1580 * load Volume Descriptor Sequence if so.
1581 */
1582 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1583 struct kernel_lb_addr *fileset)
1584 {
1585 struct buffer_head *bh;
1586 uint16_t ident;
1587 int ret;
1588
1589 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1590 udf_fixed_to_variable(block) >=
1591 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1592 return 0;
1593
1594 bh = udf_read_tagged(sb, block, block, &ident);
1595 if (!bh)
1596 return 0;
1597 if (ident != TAG_IDENT_AVDP) {
1598 brelse(bh);
1599 return 0;
1600 }
1601 ret = udf_load_sequence(sb, bh, fileset);
1602 brelse(bh);
1603 return ret;
1604 }
1605
1606 /* Search for an anchor volume descriptor pointer */
1607 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1608 struct kernel_lb_addr *fileset)
1609 {
1610 sector_t last[6];
1611 int i;
1612 struct udf_sb_info *sbi = UDF_SB(sb);
1613 int last_count = 0;
1614
1615 /* First try user provided anchor */
1616 if (sbi->s_anchor) {
1617 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1618 return lastblock;
1619 }
1620 /*
1621 * according to spec, anchor is in either:
1622 * block 256
1623 * lastblock-256
1624 * lastblock
1625 * however, if the disc isn't closed, it could be 512.
1626 */
1627 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1628 return lastblock;
1629 /*
1630 * The trouble is which block is the last one. Drives often misreport
1631 * this so we try various possibilities.
1632 */
1633 last[last_count++] = lastblock;
1634 if (lastblock >= 1)
1635 last[last_count++] = lastblock - 1;
1636 last[last_count++] = lastblock + 1;
1637 if (lastblock >= 2)
1638 last[last_count++] = lastblock - 2;
1639 if (lastblock >= 150)
1640 last[last_count++] = lastblock - 150;
1641 if (lastblock >= 152)
1642 last[last_count++] = lastblock - 152;
1643
1644 for (i = 0; i < last_count; i++) {
1645 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1646 sb->s_blocksize_bits)
1647 continue;
1648 if (udf_check_anchor_block(sb, last[i], fileset))
1649 return last[i];
1650 if (last[i] < 256)
1651 continue;
1652 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1653 return last[i];
1654 }
1655
1656 /* Finally try block 512 in case media is open */
1657 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1658 return last[0];
1659 return 0;
1660 }
1661
1662 /*
1663 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1664 * area specified by it. The function expects sbi->s_lastblock to be the last
1665 * block on the media.
1666 *
1667 * Return 1 if ok, 0 if not found.
1668 *
1669 */
1670 static int udf_find_anchor(struct super_block *sb,
1671 struct kernel_lb_addr *fileset)
1672 {
1673 sector_t lastblock;
1674 struct udf_sb_info *sbi = UDF_SB(sb);
1675
1676 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1677 if (lastblock)
1678 goto out;
1679
1680 /* No anchor found? Try VARCONV conversion of block numbers */
1681 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1682 /* Firstly, we try to not convert number of the last block */
1683 lastblock = udf_scan_anchors(sb,
1684 udf_variable_to_fixed(sbi->s_last_block),
1685 fileset);
1686 if (lastblock)
1687 goto out;
1688
1689 /* Secondly, we try with converted number of the last block */
1690 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1691 if (!lastblock) {
1692 /* VARCONV didn't help. Clear it. */
1693 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1694 return 0;
1695 }
1696 out:
1697 sbi->s_last_block = lastblock;
1698 return 1;
1699 }
1700
1701 /*
1702 * Check Volume Structure Descriptor, find Anchor block and load Volume
1703 * Descriptor Sequence
1704 */
1705 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1706 int silent, struct kernel_lb_addr *fileset)
1707 {
1708 struct udf_sb_info *sbi = UDF_SB(sb);
1709 loff_t nsr_off;
1710
1711 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1712 if (!silent)
1713 udf_warn(sb, "Bad block size\n");
1714 return 0;
1715 }
1716 sbi->s_last_block = uopt->lastblock;
1717 if (!uopt->novrs) {
1718 /* Check that it is NSR02 compliant */
1719 nsr_off = udf_check_vsd(sb);
1720 if (!nsr_off) {
1721 if (!silent)
1722 udf_warn(sb, "No VRS found\n");
1723 return 0;
1724 }
1725 if (nsr_off == -1)
1726 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1727 if (!sbi->s_last_block)
1728 sbi->s_last_block = udf_get_last_block(sb);
1729 } else {
1730 udf_debug("Validity check skipped because of novrs option\n");
1731 }
1732
1733 /* Look for anchor block and load Volume Descriptor Sequence */
1734 sbi->s_anchor = uopt->anchor;
1735 if (!udf_find_anchor(sb, fileset)) {
1736 if (!silent)
1737 udf_warn(sb, "No anchor found\n");
1738 return 0;
1739 }
1740 return 1;
1741 }
1742
1743 static void udf_open_lvid(struct super_block *sb)
1744 {
1745 struct udf_sb_info *sbi = UDF_SB(sb);
1746 struct buffer_head *bh = sbi->s_lvid_bh;
1747 struct logicalVolIntegrityDesc *lvid;
1748 struct logicalVolIntegrityDescImpUse *lvidiu;
1749
1750 if (!bh)
1751 return;
1752
1753 mutex_lock(&sbi->s_alloc_mutex);
1754 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1755 lvidiu = udf_sb_lvidiu(sbi);
1756
1757 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1758 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1759 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1760 CURRENT_TIME);
1761 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1762
1763 lvid->descTag.descCRC = cpu_to_le16(
1764 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1765 le16_to_cpu(lvid->descTag.descCRCLength)));
1766
1767 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1768 mark_buffer_dirty(bh);
1769 sbi->s_lvid_dirty = 0;
1770 mutex_unlock(&sbi->s_alloc_mutex);
1771 }
1772
1773 static void udf_close_lvid(struct super_block *sb)
1774 {
1775 struct udf_sb_info *sbi = UDF_SB(sb);
1776 struct buffer_head *bh = sbi->s_lvid_bh;
1777 struct logicalVolIntegrityDesc *lvid;
1778 struct logicalVolIntegrityDescImpUse *lvidiu;
1779
1780 if (!bh)
1781 return;
1782
1783 mutex_lock(&sbi->s_alloc_mutex);
1784 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1785 lvidiu = udf_sb_lvidiu(sbi);
1786 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1787 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1788 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1789 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1790 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1791 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1792 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1793 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1794 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1795 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1796
1797 lvid->descTag.descCRC = cpu_to_le16(
1798 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1799 le16_to_cpu(lvid->descTag.descCRCLength)));
1800
1801 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1802 mark_buffer_dirty(bh);
1803 sbi->s_lvid_dirty = 0;
1804 mutex_unlock(&sbi->s_alloc_mutex);
1805 }
1806
1807 u64 lvid_get_unique_id(struct super_block *sb)
1808 {
1809 struct buffer_head *bh;
1810 struct udf_sb_info *sbi = UDF_SB(sb);
1811 struct logicalVolIntegrityDesc *lvid;
1812 struct logicalVolHeaderDesc *lvhd;
1813 u64 uniqueID;
1814 u64 ret;
1815
1816 bh = sbi->s_lvid_bh;
1817 if (!bh)
1818 return 0;
1819
1820 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1821 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1822
1823 mutex_lock(&sbi->s_alloc_mutex);
1824 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1825 if (!(++uniqueID & 0xFFFFFFFF))
1826 uniqueID += 16;
1827 lvhd->uniqueID = cpu_to_le64(uniqueID);
1828 mutex_unlock(&sbi->s_alloc_mutex);
1829 mark_buffer_dirty(bh);
1830
1831 return ret;
1832 }
1833
1834 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1835 {
1836 int i;
1837 int nr_groups = bitmap->s_nr_groups;
1838 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1839 nr_groups);
1840
1841 for (i = 0; i < nr_groups; i++)
1842 if (bitmap->s_block_bitmap[i])
1843 brelse(bitmap->s_block_bitmap[i]);
1844
1845 if (size <= PAGE_SIZE)
1846 kfree(bitmap);
1847 else
1848 vfree(bitmap);
1849 }
1850
1851 static void udf_free_partition(struct udf_part_map *map)
1852 {
1853 int i;
1854 struct udf_meta_data *mdata;
1855
1856 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1857 iput(map->s_uspace.s_table);
1858 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1859 iput(map->s_fspace.s_table);
1860 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1861 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1862 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1863 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1864 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1865 for (i = 0; i < 4; i++)
1866 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1867 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1868 mdata = &map->s_type_specific.s_metadata;
1869 iput(mdata->s_metadata_fe);
1870 mdata->s_metadata_fe = NULL;
1871
1872 iput(mdata->s_mirror_fe);
1873 mdata->s_mirror_fe = NULL;
1874
1875 iput(mdata->s_bitmap_fe);
1876 mdata->s_bitmap_fe = NULL;
1877 }
1878 }
1879
1880 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1881 {
1882 int i;
1883 int ret;
1884 struct inode *inode = NULL;
1885 struct udf_options uopt;
1886 struct kernel_lb_addr rootdir, fileset;
1887 struct udf_sb_info *sbi;
1888
1889 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1890 uopt.uid = -1;
1891 uopt.gid = -1;
1892 uopt.umask = 0;
1893 uopt.fmode = UDF_INVALID_MODE;
1894 uopt.dmode = UDF_INVALID_MODE;
1895
1896 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1897 if (!sbi)
1898 return -ENOMEM;
1899
1900 sb->s_fs_info = sbi;
1901
1902 mutex_init(&sbi->s_alloc_mutex);
1903
1904 if (!udf_parse_options((char *)options, &uopt, false))
1905 goto error_out;
1906
1907 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1908 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1909 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1910 goto error_out;
1911 }
1912 #ifdef CONFIG_UDF_NLS
1913 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1914 uopt.nls_map = load_nls_default();
1915 if (!uopt.nls_map)
1916 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1917 else
1918 udf_debug("Using default NLS map\n");
1919 }
1920 #endif
1921 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1922 uopt.flags |= (1 << UDF_FLAG_UTF8);
1923
1924 fileset.logicalBlockNum = 0xFFFFFFFF;
1925 fileset.partitionReferenceNum = 0xFFFF;
1926
1927 sbi->s_flags = uopt.flags;
1928 sbi->s_uid = uopt.uid;
1929 sbi->s_gid = uopt.gid;
1930 sbi->s_umask = uopt.umask;
1931 sbi->s_fmode = uopt.fmode;
1932 sbi->s_dmode = uopt.dmode;
1933 sbi->s_nls_map = uopt.nls_map;
1934 rwlock_init(&sbi->s_cred_lock);
1935
1936 if (uopt.session == 0xFFFFFFFF)
1937 sbi->s_session = udf_get_last_session(sb);
1938 else
1939 sbi->s_session = uopt.session;
1940
1941 udf_debug("Multi-session=%d\n", sbi->s_session);
1942
1943 /* Fill in the rest of the superblock */
1944 sb->s_op = &udf_sb_ops;
1945 sb->s_export_op = &udf_export_ops;
1946
1947 sb->s_dirt = 0;
1948 sb->s_magic = UDF_SUPER_MAGIC;
1949 sb->s_time_gran = 1000;
1950
1951 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1952 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1953 } else {
1954 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1955 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1956 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1957 if (!silent)
1958 pr_notice("Rescanning with blocksize %d\n",
1959 UDF_DEFAULT_BLOCKSIZE);
1960 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1961 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1962 }
1963 }
1964 if (!ret) {
1965 udf_warn(sb, "No partition found (1)\n");
1966 goto error_out;
1967 }
1968
1969 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1970
1971 if (sbi->s_lvid_bh) {
1972 struct logicalVolIntegrityDescImpUse *lvidiu =
1973 udf_sb_lvidiu(sbi);
1974 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1975 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1976 /* uint16_t maxUDFWriteRev =
1977 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1978
1979 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1980 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
1981 le16_to_cpu(lvidiu->minUDFReadRev),
1982 UDF_MAX_READ_VERSION);
1983 goto error_out;
1984 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1985 sb->s_flags |= MS_RDONLY;
1986
1987 sbi->s_udfrev = minUDFWriteRev;
1988
1989 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1990 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1991 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1992 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1993 }
1994
1995 if (!sbi->s_partitions) {
1996 udf_warn(sb, "No partition found (2)\n");
1997 goto error_out;
1998 }
1999
2000 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2001 UDF_PART_FLAG_READ_ONLY) {
2002 pr_notice("Partition marked readonly; forcing readonly mount\n");
2003 sb->s_flags |= MS_RDONLY;
2004 }
2005
2006 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2007 udf_warn(sb, "No fileset found\n");
2008 goto error_out;
2009 }
2010
2011 if (!silent) {
2012 struct timestamp ts;
2013 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2014 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2015 sbi->s_volume_ident,
2016 le16_to_cpu(ts.year), ts.month, ts.day,
2017 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2018 }
2019 if (!(sb->s_flags & MS_RDONLY))
2020 udf_open_lvid(sb);
2021
2022 /* Assign the root inode */
2023 /* assign inodes by physical block number */
2024 /* perhaps it's not extensible enough, but for now ... */
2025 inode = udf_iget(sb, &rootdir);
2026 if (!inode) {
2027 udf_err(sb, "Error in udf_iget, block=%d, 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 udf_err(sb, "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 void _udf_err(struct super_block *sb, const char *function,
2064 const char *fmt, ...)
2065 {
2066 struct va_format vaf;
2067 va_list args;
2068
2069 /* mark sb error */
2070 if (!(sb->s_flags & MS_RDONLY))
2071 sb->s_dirt = 1;
2072
2073 va_start(args, fmt);
2074
2075 vaf.fmt = fmt;
2076 vaf.va = &args;
2077
2078 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2079
2080 va_end(args);
2081 }
2082
2083 void _udf_warn(struct super_block *sb, const char *function,
2084 const char *fmt, ...)
2085 {
2086 struct va_format vaf;
2087 va_list args;
2088
2089 va_start(args, fmt);
2090
2091 vaf.fmt = fmt;
2092 vaf.va = &args;
2093
2094 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2095
2096 va_end(args);
2097 }
2098
2099 static void udf_put_super(struct super_block *sb)
2100 {
2101 int i;
2102 struct udf_sb_info *sbi;
2103
2104 sbi = UDF_SB(sb);
2105
2106 if (sbi->s_vat_inode)
2107 iput(sbi->s_vat_inode);
2108 if (sbi->s_partitions)
2109 for (i = 0; i < sbi->s_partitions; i++)
2110 udf_free_partition(&sbi->s_partmaps[i]);
2111 #ifdef CONFIG_UDF_NLS
2112 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2113 unload_nls(sbi->s_nls_map);
2114 #endif
2115 if (!(sb->s_flags & MS_RDONLY))
2116 udf_close_lvid(sb);
2117 brelse(sbi->s_lvid_bh);
2118 kfree(sbi->s_partmaps);
2119 kfree(sb->s_fs_info);
2120 sb->s_fs_info = NULL;
2121 }
2122
2123 static int udf_sync_fs(struct super_block *sb, int wait)
2124 {
2125 struct udf_sb_info *sbi = UDF_SB(sb);
2126
2127 mutex_lock(&sbi->s_alloc_mutex);
2128 if (sbi->s_lvid_dirty) {
2129 /*
2130 * Blockdevice will be synced later so we don't have to submit
2131 * the buffer for IO
2132 */
2133 mark_buffer_dirty(sbi->s_lvid_bh);
2134 sb->s_dirt = 0;
2135 sbi->s_lvid_dirty = 0;
2136 }
2137 mutex_unlock(&sbi->s_alloc_mutex);
2138
2139 return 0;
2140 }
2141
2142 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2143 {
2144 struct super_block *sb = dentry->d_sb;
2145 struct udf_sb_info *sbi = UDF_SB(sb);
2146 struct logicalVolIntegrityDescImpUse *lvidiu;
2147 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2148
2149 if (sbi->s_lvid_bh != NULL)
2150 lvidiu = udf_sb_lvidiu(sbi);
2151 else
2152 lvidiu = NULL;
2153
2154 buf->f_type = UDF_SUPER_MAGIC;
2155 buf->f_bsize = sb->s_blocksize;
2156 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2157 buf->f_bfree = udf_count_free(sb);
2158 buf->f_bavail = buf->f_bfree;
2159 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2160 le32_to_cpu(lvidiu->numDirs)) : 0)
2161 + buf->f_bfree;
2162 buf->f_ffree = buf->f_bfree;
2163 buf->f_namelen = UDF_NAME_LEN - 2;
2164 buf->f_fsid.val[0] = (u32)id;
2165 buf->f_fsid.val[1] = (u32)(id >> 32);
2166
2167 return 0;
2168 }
2169
2170 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2171 struct udf_bitmap *bitmap)
2172 {
2173 struct buffer_head *bh = NULL;
2174 unsigned int accum = 0;
2175 int index;
2176 int block = 0, newblock;
2177 struct kernel_lb_addr loc;
2178 uint32_t bytes;
2179 uint8_t *ptr;
2180 uint16_t ident;
2181 struct spaceBitmapDesc *bm;
2182
2183 loc.logicalBlockNum = bitmap->s_extPosition;
2184 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2185 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2186
2187 if (!bh) {
2188 udf_err(sb, "udf_count_free failed\n");
2189 goto out;
2190 } else if (ident != TAG_IDENT_SBD) {
2191 brelse(bh);
2192 udf_err(sb, "udf_count_free failed\n");
2193 goto out;
2194 }
2195
2196 bm = (struct spaceBitmapDesc *)bh->b_data;
2197 bytes = le32_to_cpu(bm->numOfBytes);
2198 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2199 ptr = (uint8_t *)bh->b_data;
2200
2201 while (bytes > 0) {
2202 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2203 accum += bitmap_weight((const unsigned long *)(ptr + index),
2204 cur_bytes * 8);
2205 bytes -= cur_bytes;
2206 if (bytes) {
2207 brelse(bh);
2208 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2209 bh = udf_tread(sb, newblock);
2210 if (!bh) {
2211 udf_debug("read failed\n");
2212 goto out;
2213 }
2214 index = 0;
2215 ptr = (uint8_t *)bh->b_data;
2216 }
2217 }
2218 brelse(bh);
2219 out:
2220 return accum;
2221 }
2222
2223 static unsigned int udf_count_free_table(struct super_block *sb,
2224 struct inode *table)
2225 {
2226 unsigned int accum = 0;
2227 uint32_t elen;
2228 struct kernel_lb_addr eloc;
2229 int8_t etype;
2230 struct extent_position epos;
2231
2232 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2233 epos.block = UDF_I(table)->i_location;
2234 epos.offset = sizeof(struct unallocSpaceEntry);
2235 epos.bh = NULL;
2236
2237 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2238 accum += (elen >> table->i_sb->s_blocksize_bits);
2239
2240 brelse(epos.bh);
2241 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2242
2243 return accum;
2244 }
2245
2246 static unsigned int udf_count_free(struct super_block *sb)
2247 {
2248 unsigned int accum = 0;
2249 struct udf_sb_info *sbi;
2250 struct udf_part_map *map;
2251
2252 sbi = UDF_SB(sb);
2253 if (sbi->s_lvid_bh) {
2254 struct logicalVolIntegrityDesc *lvid =
2255 (struct logicalVolIntegrityDesc *)
2256 sbi->s_lvid_bh->b_data;
2257 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2258 accum = le32_to_cpu(
2259 lvid->freeSpaceTable[sbi->s_partition]);
2260 if (accum == 0xFFFFFFFF)
2261 accum = 0;
2262 }
2263 }
2264
2265 if (accum)
2266 return accum;
2267
2268 map = &sbi->s_partmaps[sbi->s_partition];
2269 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2270 accum += udf_count_free_bitmap(sb,
2271 map->s_uspace.s_bitmap);
2272 }
2273 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2274 accum += udf_count_free_bitmap(sb,
2275 map->s_fspace.s_bitmap);
2276 }
2277 if (accum)
2278 return accum;
2279
2280 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2281 accum += udf_count_free_table(sb,
2282 map->s_uspace.s_table);
2283 }
2284 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2285 accum += udf_count_free_table(sb,
2286 map->s_fspace.s_table);
2287 }
2288
2289 return accum;
2290 }