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irqchip: armada-370-xp: properly request resources
[linux-2.6/btrfs-unstable.git] / fs / udf / super.c
blob839a2bad7f45b693db4ed478598b997c42077712
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 <linux/log2.h>
60 #include <asm/byteorder.h>
61
62 #include "udf_sb.h"
63 #include "udf_i.h"
64
65 #include <linux/init.h>
66 #include <asm/uaccess.h>
67
68 #define VDS_POS_PRIMARY_VOL_DESC 0
69 #define VDS_POS_UNALLOC_SPACE_DESC 1
70 #define VDS_POS_LOGICAL_VOL_DESC 2
71 #define VDS_POS_PARTITION_DESC 3
72 #define VDS_POS_IMP_USE_VOL_DESC 4
73 #define VDS_POS_VOL_DESC_PTR 5
74 #define VDS_POS_TERMINATING_DESC 6
75 #define VDS_POS_LENGTH 7
76
77 #define UDF_DEFAULT_BLOCKSIZE 2048
78
79 enum { UDF_MAX_LINKS = 0xffff };
80
81 /* These are the "meat" - everything else is stuffing */
82 static int udf_fill_super(struct super_block *, void *, int);
83 static void udf_put_super(struct super_block *);
84 static int udf_sync_fs(struct super_block *, int);
85 static int udf_remount_fs(struct super_block *, int *, char *);
86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
88 struct kernel_lb_addr *);
89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
90 struct kernel_lb_addr *);
91 static void udf_open_lvid(struct super_block *);
92 static void udf_close_lvid(struct super_block *);
93 static unsigned int udf_count_free(struct super_block *);
94 static int udf_statfs(struct dentry *, struct kstatfs *);
95 static int udf_show_options(struct seq_file *, struct dentry *);
96
97 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
98 {
99 struct logicalVolIntegrityDesc *lvid =
100 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
101 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
102 __u32 offset = number_of_partitions * 2 *
103 sizeof(uint32_t)/sizeof(uint8_t);
104 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
105 }
106
107 /* UDF filesystem type */
108 static struct dentry *udf_mount(struct file_system_type *fs_type,
109 int flags, const char *dev_name, void *data)
110 {
111 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
112 }
113
114 static struct file_system_type udf_fstype = {
115 .owner = THIS_MODULE,
116 .name = "udf",
117 .mount = udf_mount,
118 .kill_sb = kill_block_super,
119 .fs_flags = FS_REQUIRES_DEV,
120 };
121 MODULE_ALIAS_FS("udf");
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 ei->cached_extent.lstart = -1;
139 spin_lock_init(&ei->i_extent_cache_lock);
140
141 return &ei->vfs_inode;
142 }
143
144 static void udf_i_callback(struct rcu_head *head)
145 {
146 struct inode *inode = container_of(head, struct inode, i_rcu);
147 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
148 }
149
150 static void udf_destroy_inode(struct inode *inode)
151 {
152 call_rcu(&inode->i_rcu, udf_i_callback);
153 }
154
155 static void init_once(void *foo)
156 {
157 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
158
159 ei->i_ext.i_data = NULL;
160 inode_init_once(&ei->vfs_inode);
161 }
162
163 static int init_inodecache(void)
164 {
165 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
166 sizeof(struct udf_inode_info),
167 0, (SLAB_RECLAIM_ACCOUNT |
168 SLAB_MEM_SPREAD),
169 init_once);
170 if (!udf_inode_cachep)
171 return -ENOMEM;
172 return 0;
173 }
174
175 static void destroy_inodecache(void)
176 {
177 /*
178 * Make sure all delayed rcu free inodes are flushed before we
179 * destroy cache.
180 */
181 rcu_barrier();
182 kmem_cache_destroy(udf_inode_cachep);
183 }
184
185 /* Superblock operations */
186 static const struct super_operations udf_sb_ops = {
187 .alloc_inode = udf_alloc_inode,
188 .destroy_inode = udf_destroy_inode,
189 .write_inode = udf_write_inode,
190 .evict_inode = udf_evict_inode,
191 .put_super = udf_put_super,
192 .sync_fs = udf_sync_fs,
193 .statfs = udf_statfs,
194 .remount_fs = udf_remount_fs,
195 .show_options = udf_show_options,
196 };
197
198 struct udf_options {
199 unsigned char novrs;
200 unsigned int blocksize;
201 unsigned int session;
202 unsigned int lastblock;
203 unsigned int anchor;
204 unsigned int volume;
205 unsigned short partition;
206 unsigned int fileset;
207 unsigned int rootdir;
208 unsigned int flags;
209 umode_t umask;
210 kgid_t gid;
211 kuid_t uid;
212 umode_t fmode;
213 umode_t dmode;
214 struct nls_table *nls_map;
215 };
216
217 static int __init init_udf_fs(void)
218 {
219 int err;
220
221 err = init_inodecache();
222 if (err)
223 goto out1;
224 err = register_filesystem(&udf_fstype);
225 if (err)
226 goto out;
227
228 return 0;
229
230 out:
231 destroy_inodecache();
232
233 out1:
234 return err;
235 }
236
237 static void __exit exit_udf_fs(void)
238 {
239 unregister_filesystem(&udf_fstype);
240 destroy_inodecache();
241 }
242
243 module_init(init_udf_fs)
244 module_exit(exit_udf_fs)
245
246 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
247 {
248 struct udf_sb_info *sbi = UDF_SB(sb);
249
250 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
251 GFP_KERNEL);
252 if (!sbi->s_partmaps) {
253 udf_err(sb, "Unable to allocate space for %d partition maps\n",
254 count);
255 sbi->s_partitions = 0;
256 return -ENOMEM;
257 }
258
259 sbi->s_partitions = count;
260 return 0;
261 }
262
263 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
264 {
265 int i;
266 int nr_groups = bitmap->s_nr_groups;
267 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
268 nr_groups);
269
270 for (i = 0; i < nr_groups; i++)
271 if (bitmap->s_block_bitmap[i])
272 brelse(bitmap->s_block_bitmap[i]);
273
274 if (size <= PAGE_SIZE)
275 kfree(bitmap);
276 else
277 vfree(bitmap);
278 }
279
280 static void udf_free_partition(struct udf_part_map *map)
281 {
282 int i;
283 struct udf_meta_data *mdata;
284
285 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
286 iput(map->s_uspace.s_table);
287 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
288 iput(map->s_fspace.s_table);
289 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
290 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
291 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
292 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
293 if (map->s_partition_type == UDF_SPARABLE_MAP15)
294 for (i = 0; i < 4; i++)
295 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
296 else if (map->s_partition_type == UDF_METADATA_MAP25) {
297 mdata = &map->s_type_specific.s_metadata;
298 iput(mdata->s_metadata_fe);
299 mdata->s_metadata_fe = NULL;
300
301 iput(mdata->s_mirror_fe);
302 mdata->s_mirror_fe = NULL;
303
304 iput(mdata->s_bitmap_fe);
305 mdata->s_bitmap_fe = NULL;
306 }
307 }
308
309 static void udf_sb_free_partitions(struct super_block *sb)
310 {
311 struct udf_sb_info *sbi = UDF_SB(sb);
312 int i;
313 if (sbi->s_partmaps == NULL)
314 return;
315 for (i = 0; i < sbi->s_partitions; i++)
316 udf_free_partition(&sbi->s_partmaps[i]);
317 kfree(sbi->s_partmaps);
318 sbi->s_partmaps = NULL;
319 }
320
321 static int udf_show_options(struct seq_file *seq, struct dentry *root)
322 {
323 struct super_block *sb = root->d_sb;
324 struct udf_sb_info *sbi = UDF_SB(sb);
325
326 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
327 seq_puts(seq, ",nostrict");
328 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
329 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
330 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
331 seq_puts(seq, ",unhide");
332 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
333 seq_puts(seq, ",undelete");
334 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
335 seq_puts(seq, ",noadinicb");
336 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
337 seq_puts(seq, ",shortad");
338 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
339 seq_puts(seq, ",uid=forget");
340 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
341 seq_puts(seq, ",uid=ignore");
342 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
343 seq_puts(seq, ",gid=forget");
344 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
345 seq_puts(seq, ",gid=ignore");
346 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
347 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
348 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
349 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
350 if (sbi->s_umask != 0)
351 seq_printf(seq, ",umask=%ho", sbi->s_umask);
352 if (sbi->s_fmode != UDF_INVALID_MODE)
353 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
354 if (sbi->s_dmode != UDF_INVALID_MODE)
355 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
356 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
357 seq_printf(seq, ",session=%u", sbi->s_session);
358 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
359 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
360 if (sbi->s_anchor != 0)
361 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
362 /*
363 * volume, partition, fileset and rootdir seem to be ignored
364 * currently
365 */
366 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
367 seq_puts(seq, ",utf8");
368 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
369 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
370
371 return 0;
372 }
373
374 /*
375 * udf_parse_options
376 *
377 * PURPOSE
378 * Parse mount options.
379 *
380 * DESCRIPTION
381 * The following mount options are supported:
382 *
383 * gid= Set the default group.
384 * umask= Set the default umask.
385 * mode= Set the default file permissions.
386 * dmode= Set the default directory permissions.
387 * uid= Set the default user.
388 * bs= Set the block size.
389 * unhide Show otherwise hidden files.
390 * undelete Show deleted files in lists.
391 * adinicb Embed data in the inode (default)
392 * noadinicb Don't embed data in the inode
393 * shortad Use short ad's
394 * longad Use long ad's (default)
395 * nostrict Unset strict conformance
396 * iocharset= Set the NLS character set
397 *
398 * The remaining are for debugging and disaster recovery:
399 *
400 * novrs Skip volume sequence recognition
401 *
402 * The following expect a offset from 0.
403 *
404 * session= Set the CDROM session (default= last session)
405 * anchor= Override standard anchor location. (default= 256)
406 * volume= Override the VolumeDesc location. (unused)
407 * partition= Override the PartitionDesc location. (unused)
408 * lastblock= Set the last block of the filesystem/
409 *
410 * The following expect a offset from the partition root.
411 *
412 * fileset= Override the fileset block location. (unused)
413 * rootdir= Override the root directory location. (unused)
414 * WARNING: overriding the rootdir to a non-directory may
415 * yield highly unpredictable results.
416 *
417 * PRE-CONDITIONS
418 * options Pointer to mount options string.
419 * uopts Pointer to mount options variable.
420 *
421 * POST-CONDITIONS
422 * <return> 1 Mount options parsed okay.
423 * <return> 0 Error parsing mount options.
424 *
425 * HISTORY
426 * July 1, 1997 - Andrew E. Mileski
427 * Written, tested, and released.
428 */
429
430 enum {
431 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
432 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
433 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
434 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
435 Opt_rootdir, Opt_utf8, Opt_iocharset,
436 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
437 Opt_fmode, Opt_dmode
438 };
439
440 static const match_table_t tokens = {
441 {Opt_novrs, "novrs"},
442 {Opt_nostrict, "nostrict"},
443 {Opt_bs, "bs=%u"},
444 {Opt_unhide, "unhide"},
445 {Opt_undelete, "undelete"},
446 {Opt_noadinicb, "noadinicb"},
447 {Opt_adinicb, "adinicb"},
448 {Opt_shortad, "shortad"},
449 {Opt_longad, "longad"},
450 {Opt_uforget, "uid=forget"},
451 {Opt_uignore, "uid=ignore"},
452 {Opt_gforget, "gid=forget"},
453 {Opt_gignore, "gid=ignore"},
454 {Opt_gid, "gid=%u"},
455 {Opt_uid, "uid=%u"},
456 {Opt_umask, "umask=%o"},
457 {Opt_session, "session=%u"},
458 {Opt_lastblock, "lastblock=%u"},
459 {Opt_anchor, "anchor=%u"},
460 {Opt_volume, "volume=%u"},
461 {Opt_partition, "partition=%u"},
462 {Opt_fileset, "fileset=%u"},
463 {Opt_rootdir, "rootdir=%u"},
464 {Opt_utf8, "utf8"},
465 {Opt_iocharset, "iocharset=%s"},
466 {Opt_fmode, "mode=%o"},
467 {Opt_dmode, "dmode=%o"},
468 {Opt_err, NULL}
469 };
470
471 static int udf_parse_options(char *options, struct udf_options *uopt,
472 bool remount)
473 {
474 char *p;
475 int option;
476
477 uopt->novrs = 0;
478 uopt->partition = 0xFFFF;
479 uopt->session = 0xFFFFFFFF;
480 uopt->lastblock = 0;
481 uopt->anchor = 0;
482 uopt->volume = 0xFFFFFFFF;
483 uopt->rootdir = 0xFFFFFFFF;
484 uopt->fileset = 0xFFFFFFFF;
485 uopt->nls_map = NULL;
486
487 if (!options)
488 return 1;
489
490 while ((p = strsep(&options, ",")) != NULL) {
491 substring_t args[MAX_OPT_ARGS];
492 int token;
493 if (!*p)
494 continue;
495
496 token = match_token(p, tokens, args);
497 switch (token) {
498 case Opt_novrs:
499 uopt->novrs = 1;
500 break;
501 case Opt_bs:
502 if (match_int(&args[0], &option))
503 return 0;
504 uopt->blocksize = option;
505 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
506 break;
507 case Opt_unhide:
508 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
509 break;
510 case Opt_undelete:
511 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
512 break;
513 case Opt_noadinicb:
514 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
515 break;
516 case Opt_adinicb:
517 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
518 break;
519 case Opt_shortad:
520 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
521 break;
522 case Opt_longad:
523 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
524 break;
525 case Opt_gid:
526 if (match_int(args, &option))
527 return 0;
528 uopt->gid = make_kgid(current_user_ns(), option);
529 if (!gid_valid(uopt->gid))
530 return 0;
531 uopt->flags |= (1 << UDF_FLAG_GID_SET);
532 break;
533 case Opt_uid:
534 if (match_int(args, &option))
535 return 0;
536 uopt->uid = make_kuid(current_user_ns(), option);
537 if (!uid_valid(uopt->uid))
538 return 0;
539 uopt->flags |= (1 << UDF_FLAG_UID_SET);
540 break;
541 case Opt_umask:
542 if (match_octal(args, &option))
543 return 0;
544 uopt->umask = option;
545 break;
546 case Opt_nostrict:
547 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
548 break;
549 case Opt_session:
550 if (match_int(args, &option))
551 return 0;
552 uopt->session = option;
553 if (!remount)
554 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
555 break;
556 case Opt_lastblock:
557 if (match_int(args, &option))
558 return 0;
559 uopt->lastblock = option;
560 if (!remount)
561 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
562 break;
563 case Opt_anchor:
564 if (match_int(args, &option))
565 return 0;
566 uopt->anchor = option;
567 break;
568 case Opt_volume:
569 if (match_int(args, &option))
570 return 0;
571 uopt->volume = option;
572 break;
573 case Opt_partition:
574 if (match_int(args, &option))
575 return 0;
576 uopt->partition = option;
577 break;
578 case Opt_fileset:
579 if (match_int(args, &option))
580 return 0;
581 uopt->fileset = option;
582 break;
583 case Opt_rootdir:
584 if (match_int(args, &option))
585 return 0;
586 uopt->rootdir = option;
587 break;
588 case Opt_utf8:
589 uopt->flags |= (1 << UDF_FLAG_UTF8);
590 break;
591 #ifdef CONFIG_UDF_NLS
592 case Opt_iocharset:
593 uopt->nls_map = load_nls(args[0].from);
594 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
595 break;
596 #endif
597 case Opt_uignore:
598 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
599 break;
600 case Opt_uforget:
601 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
602 break;
603 case Opt_gignore:
604 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
605 break;
606 case Opt_gforget:
607 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
608 break;
609 case Opt_fmode:
610 if (match_octal(args, &option))
611 return 0;
612 uopt->fmode = option & 0777;
613 break;
614 case Opt_dmode:
615 if (match_octal(args, &option))
616 return 0;
617 uopt->dmode = option & 0777;
618 break;
619 default:
620 pr_err("bad mount option \"%s\" or missing value\n", p);
621 return 0;
622 }
623 }
624 return 1;
625 }
626
627 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
628 {
629 struct udf_options uopt;
630 struct udf_sb_info *sbi = UDF_SB(sb);
631 int error = 0;
632
633 if (sbi->s_lvid_bh) {
634 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
635 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
636 return -EACCES;
637 }
638
639 uopt.flags = sbi->s_flags;
640 uopt.uid = sbi->s_uid;
641 uopt.gid = sbi->s_gid;
642 uopt.umask = sbi->s_umask;
643 uopt.fmode = sbi->s_fmode;
644 uopt.dmode = sbi->s_dmode;
645
646 if (!udf_parse_options(options, &uopt, true))
647 return -EINVAL;
648
649 write_lock(&sbi->s_cred_lock);
650 sbi->s_flags = uopt.flags;
651 sbi->s_uid = uopt.uid;
652 sbi->s_gid = uopt.gid;
653 sbi->s_umask = uopt.umask;
654 sbi->s_fmode = uopt.fmode;
655 sbi->s_dmode = uopt.dmode;
656 write_unlock(&sbi->s_cred_lock);
657
658 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
659 goto out_unlock;
660
661 if (*flags & MS_RDONLY)
662 udf_close_lvid(sb);
663 else
664 udf_open_lvid(sb);
665
666 out_unlock:
667 return error;
668 }
669
670 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
671 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
672 static loff_t udf_check_vsd(struct super_block *sb)
673 {
674 struct volStructDesc *vsd = NULL;
675 loff_t sector = 32768;
676 int sectorsize;
677 struct buffer_head *bh = NULL;
678 int nsr02 = 0;
679 int nsr03 = 0;
680 struct udf_sb_info *sbi;
681
682 sbi = UDF_SB(sb);
683 if (sb->s_blocksize < sizeof(struct volStructDesc))
684 sectorsize = sizeof(struct volStructDesc);
685 else
686 sectorsize = sb->s_blocksize;
687
688 sector += (sbi->s_session << sb->s_blocksize_bits);
689
690 udf_debug("Starting at sector %u (%ld byte sectors)\n",
691 (unsigned int)(sector >> sb->s_blocksize_bits),
692 sb->s_blocksize);
693 /* Process the sequence (if applicable) */
694 for (; !nsr02 && !nsr03; sector += sectorsize) {
695 /* Read a block */
696 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
697 if (!bh)
698 break;
699
700 /* Look for ISO descriptors */
701 vsd = (struct volStructDesc *)(bh->b_data +
702 (sector & (sb->s_blocksize - 1)));
703
704 if (vsd->stdIdent[0] == 0) {
705 brelse(bh);
706 break;
707 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
708 VSD_STD_ID_LEN)) {
709 switch (vsd->structType) {
710 case 0:
711 udf_debug("ISO9660 Boot Record found\n");
712 break;
713 case 1:
714 udf_debug("ISO9660 Primary Volume Descriptor found\n");
715 break;
716 case 2:
717 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
718 break;
719 case 3:
720 udf_debug("ISO9660 Volume Partition Descriptor found\n");
721 break;
722 case 255:
723 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
724 break;
725 default:
726 udf_debug("ISO9660 VRS (%u) found\n",
727 vsd->structType);
728 break;
729 }
730 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
731 VSD_STD_ID_LEN))
732 ; /* nothing */
733 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
734 VSD_STD_ID_LEN)) {
735 brelse(bh);
736 break;
737 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
738 VSD_STD_ID_LEN))
739 nsr02 = sector;
740 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
741 VSD_STD_ID_LEN))
742 nsr03 = sector;
743 brelse(bh);
744 }
745
746 if (nsr03)
747 return nsr03;
748 else if (nsr02)
749 return nsr02;
750 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
751 return -1;
752 else
753 return 0;
754 }
755
756 static int udf_find_fileset(struct super_block *sb,
757 struct kernel_lb_addr *fileset,
758 struct kernel_lb_addr *root)
759 {
760 struct buffer_head *bh = NULL;
761 long lastblock;
762 uint16_t ident;
763 struct udf_sb_info *sbi;
764
765 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
766 fileset->partitionReferenceNum != 0xFFFF) {
767 bh = udf_read_ptagged(sb, fileset, 0, &ident);
768
769 if (!bh) {
770 return 1;
771 } else if (ident != TAG_IDENT_FSD) {
772 brelse(bh);
773 return 1;
774 }
775
776 }
777
778 sbi = UDF_SB(sb);
779 if (!bh) {
780 /* Search backwards through the partitions */
781 struct kernel_lb_addr newfileset;
782
783 /* --> cvg: FIXME - is it reasonable? */
784 return 1;
785
786 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
787 (newfileset.partitionReferenceNum != 0xFFFF &&
788 fileset->logicalBlockNum == 0xFFFFFFFF &&
789 fileset->partitionReferenceNum == 0xFFFF);
790 newfileset.partitionReferenceNum--) {
791 lastblock = sbi->s_partmaps
792 [newfileset.partitionReferenceNum]
793 .s_partition_len;
794 newfileset.logicalBlockNum = 0;
795
796 do {
797 bh = udf_read_ptagged(sb, &newfileset, 0,
798 &ident);
799 if (!bh) {
800 newfileset.logicalBlockNum++;
801 continue;
802 }
803
804 switch (ident) {
805 case TAG_IDENT_SBD:
806 {
807 struct spaceBitmapDesc *sp;
808 sp = (struct spaceBitmapDesc *)
809 bh->b_data;
810 newfileset.logicalBlockNum += 1 +
811 ((le32_to_cpu(sp->numOfBytes) +
812 sizeof(struct spaceBitmapDesc)
813 - 1) >> sb->s_blocksize_bits);
814 brelse(bh);
815 break;
816 }
817 case TAG_IDENT_FSD:
818 *fileset = newfileset;
819 break;
820 default:
821 newfileset.logicalBlockNum++;
822 brelse(bh);
823 bh = NULL;
824 break;
825 }
826 } while (newfileset.logicalBlockNum < lastblock &&
827 fileset->logicalBlockNum == 0xFFFFFFFF &&
828 fileset->partitionReferenceNum == 0xFFFF);
829 }
830 }
831
832 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
833 fileset->partitionReferenceNum != 0xFFFF) && bh) {
834 udf_debug("Fileset at block=%d, partition=%d\n",
835 fileset->logicalBlockNum,
836 fileset->partitionReferenceNum);
837
838 sbi->s_partition = fileset->partitionReferenceNum;
839 udf_load_fileset(sb, bh, root);
840 brelse(bh);
841 return 0;
842 }
843 return 1;
844 }
845
846 /*
847 * Load primary Volume Descriptor Sequence
848 *
849 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
850 * should be tried.
851 */
852 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
853 {
854 struct primaryVolDesc *pvoldesc;
855 struct ustr *instr, *outstr;
856 struct buffer_head *bh;
857 uint16_t ident;
858 int ret = -ENOMEM;
859
860 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
861 if (!instr)
862 return -ENOMEM;
863
864 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
865 if (!outstr)
866 goto out1;
867
868 bh = udf_read_tagged(sb, block, block, &ident);
869 if (!bh) {
870 ret = -EAGAIN;
871 goto out2;
872 }
873
874 if (ident != TAG_IDENT_PVD) {
875 ret = -EIO;
876 goto out_bh;
877 }
878
879 pvoldesc = (struct primaryVolDesc *)bh->b_data;
880
881 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
882 pvoldesc->recordingDateAndTime)) {
883 #ifdef UDFFS_DEBUG
884 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
885 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
886 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
887 ts->minute, le16_to_cpu(ts->typeAndTimezone));
888 #endif
889 }
890
891 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
892 if (udf_CS0toUTF8(outstr, instr)) {
893 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
894 outstr->u_len > 31 ? 31 : outstr->u_len);
895 udf_debug("volIdent[] = '%s'\n",
896 UDF_SB(sb)->s_volume_ident);
897 }
898
899 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
900 if (udf_CS0toUTF8(outstr, instr))
901 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
902
903 ret = 0;
904 out_bh:
905 brelse(bh);
906 out2:
907 kfree(outstr);
908 out1:
909 kfree(instr);
910 return ret;
911 }
912
913 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
914 u32 meta_file_loc, u32 partition_num)
915 {
916 struct kernel_lb_addr addr;
917 struct inode *metadata_fe;
918
919 addr.logicalBlockNum = meta_file_loc;
920 addr.partitionReferenceNum = partition_num;
921
922 metadata_fe = udf_iget(sb, &addr);
923
924 if (metadata_fe == NULL)
925 udf_warn(sb, "metadata inode efe not found\n");
926 else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
927 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
928 iput(metadata_fe);
929 metadata_fe = NULL;
930 }
931
932 return metadata_fe;
933 }
934
935 static int udf_load_metadata_files(struct super_block *sb, int partition)
936 {
937 struct udf_sb_info *sbi = UDF_SB(sb);
938 struct udf_part_map *map;
939 struct udf_meta_data *mdata;
940 struct kernel_lb_addr addr;
941
942 map = &sbi->s_partmaps[partition];
943 mdata = &map->s_type_specific.s_metadata;
944
945 /* metadata address */
946 udf_debug("Metadata file location: block = %d part = %d\n",
947 mdata->s_meta_file_loc, map->s_partition_num);
948
949 mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
950 mdata->s_meta_file_loc, map->s_partition_num);
951
952 if (mdata->s_metadata_fe == NULL) {
953 /* mirror file entry */
954 udf_debug("Mirror metadata file location: block = %d part = %d\n",
955 mdata->s_mirror_file_loc, map->s_partition_num);
956
957 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
958 mdata->s_mirror_file_loc, map->s_partition_num);
959
960 if (mdata->s_mirror_fe == NULL) {
961 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
962 return -EIO;
963 }
964 }
965
966 /*
967 * bitmap file entry
968 * Note:
969 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
970 */
971 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
972 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
973 addr.partitionReferenceNum = map->s_partition_num;
974
975 udf_debug("Bitmap file location: block = %d part = %d\n",
976 addr.logicalBlockNum, addr.partitionReferenceNum);
977
978 mdata->s_bitmap_fe = udf_iget(sb, &addr);
979 if (mdata->s_bitmap_fe == NULL) {
980 if (sb->s_flags & MS_RDONLY)
981 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
982 else {
983 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
984 return -EIO;
985 }
986 }
987 }
988
989 udf_debug("udf_load_metadata_files Ok\n");
990 return 0;
991 }
992
993 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
994 struct kernel_lb_addr *root)
995 {
996 struct fileSetDesc *fset;
997
998 fset = (struct fileSetDesc *)bh->b_data;
999
1000 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1001
1002 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1003
1004 udf_debug("Rootdir at block=%d, partition=%d\n",
1005 root->logicalBlockNum, root->partitionReferenceNum);
1006 }
1007
1008 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1009 {
1010 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1011 return DIV_ROUND_UP(map->s_partition_len +
1012 (sizeof(struct spaceBitmapDesc) << 3),
1013 sb->s_blocksize * 8);
1014 }
1015
1016 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1017 {
1018 struct udf_bitmap *bitmap;
1019 int nr_groups;
1020 int size;
1021
1022 nr_groups = udf_compute_nr_groups(sb, index);
1023 size = sizeof(struct udf_bitmap) +
1024 (sizeof(struct buffer_head *) * nr_groups);
1025
1026 if (size <= PAGE_SIZE)
1027 bitmap = kzalloc(size, GFP_KERNEL);
1028 else
1029 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1030
1031 if (bitmap == NULL)
1032 return NULL;
1033
1034 bitmap->s_nr_groups = nr_groups;
1035 return bitmap;
1036 }
1037
1038 static int udf_fill_partdesc_info(struct super_block *sb,
1039 struct partitionDesc *p, int p_index)
1040 {
1041 struct udf_part_map *map;
1042 struct udf_sb_info *sbi = UDF_SB(sb);
1043 struct partitionHeaderDesc *phd;
1044
1045 map = &sbi->s_partmaps[p_index];
1046
1047 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1048 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1049
1050 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1051 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1052 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1053 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1054 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1055 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1056 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1057 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1058
1059 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1060 p_index, map->s_partition_type,
1061 map->s_partition_root, map->s_partition_len);
1062
1063 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1064 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1065 return 0;
1066
1067 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1068 if (phd->unallocSpaceTable.extLength) {
1069 struct kernel_lb_addr loc = {
1070 .logicalBlockNum = le32_to_cpu(
1071 phd->unallocSpaceTable.extPosition),
1072 .partitionReferenceNum = p_index,
1073 };
1074
1075 map->s_uspace.s_table = udf_iget(sb, &loc);
1076 if (!map->s_uspace.s_table) {
1077 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1078 p_index);
1079 return -EIO;
1080 }
1081 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1082 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1083 p_index, map->s_uspace.s_table->i_ino);
1084 }
1085
1086 if (phd->unallocSpaceBitmap.extLength) {
1087 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1088 if (!bitmap)
1089 return -ENOMEM;
1090 map->s_uspace.s_bitmap = bitmap;
1091 bitmap->s_extPosition = le32_to_cpu(
1092 phd->unallocSpaceBitmap.extPosition);
1093 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1094 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1095 p_index, bitmap->s_extPosition);
1096 }
1097
1098 if (phd->partitionIntegrityTable.extLength)
1099 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1100
1101 if (phd->freedSpaceTable.extLength) {
1102 struct kernel_lb_addr loc = {
1103 .logicalBlockNum = le32_to_cpu(
1104 phd->freedSpaceTable.extPosition),
1105 .partitionReferenceNum = p_index,
1106 };
1107
1108 map->s_fspace.s_table = udf_iget(sb, &loc);
1109 if (!map->s_fspace.s_table) {
1110 udf_debug("cannot load freedSpaceTable (part %d)\n",
1111 p_index);
1112 return -EIO;
1113 }
1114
1115 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1116 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1117 p_index, map->s_fspace.s_table->i_ino);
1118 }
1119
1120 if (phd->freedSpaceBitmap.extLength) {
1121 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1122 if (!bitmap)
1123 return -ENOMEM;
1124 map->s_fspace.s_bitmap = bitmap;
1125 bitmap->s_extPosition = le32_to_cpu(
1126 phd->freedSpaceBitmap.extPosition);
1127 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1128 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1129 p_index, bitmap->s_extPosition);
1130 }
1131 return 0;
1132 }
1133
1134 static void udf_find_vat_block(struct super_block *sb, int p_index,
1135 int type1_index, sector_t start_block)
1136 {
1137 struct udf_sb_info *sbi = UDF_SB(sb);
1138 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1139 sector_t vat_block;
1140 struct kernel_lb_addr ino;
1141
1142 /*
1143 * VAT file entry is in the last recorded block. Some broken disks have
1144 * it a few blocks before so try a bit harder...
1145 */
1146 ino.partitionReferenceNum = type1_index;
1147 for (vat_block = start_block;
1148 vat_block >= map->s_partition_root &&
1149 vat_block >= start_block - 3 &&
1150 !sbi->s_vat_inode; vat_block--) {
1151 ino.logicalBlockNum = vat_block - map->s_partition_root;
1152 sbi->s_vat_inode = udf_iget(sb, &ino);
1153 }
1154 }
1155
1156 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1157 {
1158 struct udf_sb_info *sbi = UDF_SB(sb);
1159 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1160 struct buffer_head *bh = NULL;
1161 struct udf_inode_info *vati;
1162 uint32_t pos;
1163 struct virtualAllocationTable20 *vat20;
1164 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1165
1166 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1167 if (!sbi->s_vat_inode &&
1168 sbi->s_last_block != blocks - 1) {
1169 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1170 (unsigned long)sbi->s_last_block,
1171 (unsigned long)blocks - 1);
1172 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1173 }
1174 if (!sbi->s_vat_inode)
1175 return -EIO;
1176
1177 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1178 map->s_type_specific.s_virtual.s_start_offset = 0;
1179 map->s_type_specific.s_virtual.s_num_entries =
1180 (sbi->s_vat_inode->i_size - 36) >> 2;
1181 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1182 vati = UDF_I(sbi->s_vat_inode);
1183 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1184 pos = udf_block_map(sbi->s_vat_inode, 0);
1185 bh = sb_bread(sb, pos);
1186 if (!bh)
1187 return -EIO;
1188 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1189 } else {
1190 vat20 = (struct virtualAllocationTable20 *)
1191 vati->i_ext.i_data;
1192 }
1193
1194 map->s_type_specific.s_virtual.s_start_offset =
1195 le16_to_cpu(vat20->lengthHeader);
1196 map->s_type_specific.s_virtual.s_num_entries =
1197 (sbi->s_vat_inode->i_size -
1198 map->s_type_specific.s_virtual.
1199 s_start_offset) >> 2;
1200 brelse(bh);
1201 }
1202 return 0;
1203 }
1204
1205 /*
1206 * Load partition descriptor block
1207 *
1208 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1209 * sequence.
1210 */
1211 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1212 {
1213 struct buffer_head *bh;
1214 struct partitionDesc *p;
1215 struct udf_part_map *map;
1216 struct udf_sb_info *sbi = UDF_SB(sb);
1217 int i, type1_idx;
1218 uint16_t partitionNumber;
1219 uint16_t ident;
1220 int ret;
1221
1222 bh = udf_read_tagged(sb, block, block, &ident);
1223 if (!bh)
1224 return -EAGAIN;
1225 if (ident != TAG_IDENT_PD) {
1226 ret = 0;
1227 goto out_bh;
1228 }
1229
1230 p = (struct partitionDesc *)bh->b_data;
1231 partitionNumber = le16_to_cpu(p->partitionNumber);
1232
1233 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1234 for (i = 0; i < sbi->s_partitions; i++) {
1235 map = &sbi->s_partmaps[i];
1236 udf_debug("Searching map: (%d == %d)\n",
1237 map->s_partition_num, partitionNumber);
1238 if (map->s_partition_num == partitionNumber &&
1239 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1240 map->s_partition_type == UDF_SPARABLE_MAP15))
1241 break;
1242 }
1243
1244 if (i >= sbi->s_partitions) {
1245 udf_debug("Partition (%d) not found in partition map\n",
1246 partitionNumber);
1247 ret = 0;
1248 goto out_bh;
1249 }
1250
1251 ret = udf_fill_partdesc_info(sb, p, i);
1252 if (ret < 0)
1253 goto out_bh;
1254
1255 /*
1256 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1257 * PHYSICAL partitions are already set up
1258 */
1259 type1_idx = i;
1260 for (i = 0; i < sbi->s_partitions; i++) {
1261 map = &sbi->s_partmaps[i];
1262
1263 if (map->s_partition_num == partitionNumber &&
1264 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1265 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1266 map->s_partition_type == UDF_METADATA_MAP25))
1267 break;
1268 }
1269
1270 if (i >= sbi->s_partitions) {
1271 ret = 0;
1272 goto out_bh;
1273 }
1274
1275 ret = udf_fill_partdesc_info(sb, p, i);
1276 if (ret < 0)
1277 goto out_bh;
1278
1279 if (map->s_partition_type == UDF_METADATA_MAP25) {
1280 ret = udf_load_metadata_files(sb, i);
1281 if (ret < 0) {
1282 udf_err(sb, "error loading MetaData partition map %d\n",
1283 i);
1284 goto out_bh;
1285 }
1286 } else {
1287 /*
1288 * If we have a partition with virtual map, we don't handle
1289 * writing to it (we overwrite blocks instead of relocating
1290 * them).
1291 */
1292 if (!(sb->s_flags & MS_RDONLY)) {
1293 ret = -EACCES;
1294 goto out_bh;
1295 }
1296 ret = udf_load_vat(sb, i, type1_idx);
1297 if (ret < 0)
1298 goto out_bh;
1299 }
1300 ret = 0;
1301 out_bh:
1302 /* In case loading failed, we handle cleanup in udf_fill_super */
1303 brelse(bh);
1304 return ret;
1305 }
1306
1307 static int udf_load_sparable_map(struct super_block *sb,
1308 struct udf_part_map *map,
1309 struct sparablePartitionMap *spm)
1310 {
1311 uint32_t loc;
1312 uint16_t ident;
1313 struct sparingTable *st;
1314 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1315 int i;
1316 struct buffer_head *bh;
1317
1318 map->s_partition_type = UDF_SPARABLE_MAP15;
1319 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1320 if (!is_power_of_2(sdata->s_packet_len)) {
1321 udf_err(sb, "error loading logical volume descriptor: "
1322 "Invalid packet length %u\n",
1323 (unsigned)sdata->s_packet_len);
1324 return -EIO;
1325 }
1326 if (spm->numSparingTables > 4) {
1327 udf_err(sb, "error loading logical volume descriptor: "
1328 "Too many sparing tables (%d)\n",
1329 (int)spm->numSparingTables);
1330 return -EIO;
1331 }
1332
1333 for (i = 0; i < spm->numSparingTables; i++) {
1334 loc = le32_to_cpu(spm->locSparingTable[i]);
1335 bh = udf_read_tagged(sb, loc, loc, &ident);
1336 if (!bh)
1337 continue;
1338
1339 st = (struct sparingTable *)bh->b_data;
1340 if (ident != 0 ||
1341 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1342 strlen(UDF_ID_SPARING)) ||
1343 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1344 sb->s_blocksize) {
1345 brelse(bh);
1346 continue;
1347 }
1348
1349 sdata->s_spar_map[i] = bh;
1350 }
1351 map->s_partition_func = udf_get_pblock_spar15;
1352 return 0;
1353 }
1354
1355 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1356 struct kernel_lb_addr *fileset)
1357 {
1358 struct logicalVolDesc *lvd;
1359 int i, offset;
1360 uint8_t type;
1361 struct udf_sb_info *sbi = UDF_SB(sb);
1362 struct genericPartitionMap *gpm;
1363 uint16_t ident;
1364 struct buffer_head *bh;
1365 unsigned int table_len;
1366 int ret;
1367
1368 bh = udf_read_tagged(sb, block, block, &ident);
1369 if (!bh)
1370 return -EAGAIN;
1371 BUG_ON(ident != TAG_IDENT_LVD);
1372 lvd = (struct logicalVolDesc *)bh->b_data;
1373 table_len = le32_to_cpu(lvd->mapTableLength);
1374 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1375 udf_err(sb, "error loading logical volume descriptor: "
1376 "Partition table too long (%u > %lu)\n", table_len,
1377 sb->s_blocksize - sizeof(*lvd));
1378 ret = -EIO;
1379 goto out_bh;
1380 }
1381
1382 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1383 if (ret)
1384 goto out_bh;
1385
1386 for (i = 0, offset = 0;
1387 i < sbi->s_partitions && offset < table_len;
1388 i++, offset += gpm->partitionMapLength) {
1389 struct udf_part_map *map = &sbi->s_partmaps[i];
1390 gpm = (struct genericPartitionMap *)
1391 &(lvd->partitionMaps[offset]);
1392 type = gpm->partitionMapType;
1393 if (type == 1) {
1394 struct genericPartitionMap1 *gpm1 =
1395 (struct genericPartitionMap1 *)gpm;
1396 map->s_partition_type = UDF_TYPE1_MAP15;
1397 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1398 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1399 map->s_partition_func = NULL;
1400 } else if (type == 2) {
1401 struct udfPartitionMap2 *upm2 =
1402 (struct udfPartitionMap2 *)gpm;
1403 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1404 strlen(UDF_ID_VIRTUAL))) {
1405 u16 suf =
1406 le16_to_cpu(((__le16 *)upm2->partIdent.
1407 identSuffix)[0]);
1408 if (suf < 0x0200) {
1409 map->s_partition_type =
1410 UDF_VIRTUAL_MAP15;
1411 map->s_partition_func =
1412 udf_get_pblock_virt15;
1413 } else {
1414 map->s_partition_type =
1415 UDF_VIRTUAL_MAP20;
1416 map->s_partition_func =
1417 udf_get_pblock_virt20;
1418 }
1419 } else if (!strncmp(upm2->partIdent.ident,
1420 UDF_ID_SPARABLE,
1421 strlen(UDF_ID_SPARABLE))) {
1422 ret = udf_load_sparable_map(sb, map,
1423 (struct sparablePartitionMap *)gpm);
1424 if (ret < 0)
1425 goto out_bh;
1426 } else if (!strncmp(upm2->partIdent.ident,
1427 UDF_ID_METADATA,
1428 strlen(UDF_ID_METADATA))) {
1429 struct udf_meta_data *mdata =
1430 &map->s_type_specific.s_metadata;
1431 struct metadataPartitionMap *mdm =
1432 (struct metadataPartitionMap *)
1433 &(lvd->partitionMaps[offset]);
1434 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1435 i, type, UDF_ID_METADATA);
1436
1437 map->s_partition_type = UDF_METADATA_MAP25;
1438 map->s_partition_func = udf_get_pblock_meta25;
1439
1440 mdata->s_meta_file_loc =
1441 le32_to_cpu(mdm->metadataFileLoc);
1442 mdata->s_mirror_file_loc =
1443 le32_to_cpu(mdm->metadataMirrorFileLoc);
1444 mdata->s_bitmap_file_loc =
1445 le32_to_cpu(mdm->metadataBitmapFileLoc);
1446 mdata->s_alloc_unit_size =
1447 le32_to_cpu(mdm->allocUnitSize);
1448 mdata->s_align_unit_size =
1449 le16_to_cpu(mdm->alignUnitSize);
1450 if (mdm->flags & 0x01)
1451 mdata->s_flags |= MF_DUPLICATE_MD;
1452
1453 udf_debug("Metadata Ident suffix=0x%x\n",
1454 le16_to_cpu(*(__le16 *)
1455 mdm->partIdent.identSuffix));
1456 udf_debug("Metadata part num=%d\n",
1457 le16_to_cpu(mdm->partitionNum));
1458 udf_debug("Metadata part alloc unit size=%d\n",
1459 le32_to_cpu(mdm->allocUnitSize));
1460 udf_debug("Metadata file loc=%d\n",
1461 le32_to_cpu(mdm->metadataFileLoc));
1462 udf_debug("Mirror file loc=%d\n",
1463 le32_to_cpu(mdm->metadataMirrorFileLoc));
1464 udf_debug("Bitmap file loc=%d\n",
1465 le32_to_cpu(mdm->metadataBitmapFileLoc));
1466 udf_debug("Flags: %d %d\n",
1467 mdata->s_flags, mdm->flags);
1468 } else {
1469 udf_debug("Unknown ident: %s\n",
1470 upm2->partIdent.ident);
1471 continue;
1472 }
1473 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1474 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1475 }
1476 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1477 i, map->s_partition_num, type, map->s_volumeseqnum);
1478 }
1479
1480 if (fileset) {
1481 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1482
1483 *fileset = lelb_to_cpu(la->extLocation);
1484 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1485 fileset->logicalBlockNum,
1486 fileset->partitionReferenceNum);
1487 }
1488 if (lvd->integritySeqExt.extLength)
1489 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1490 ret = 0;
1491 out_bh:
1492 brelse(bh);
1493 return ret;
1494 }
1495
1496 /*
1497 * udf_load_logicalvolint
1498 *
1499 */
1500 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1501 {
1502 struct buffer_head *bh = NULL;
1503 uint16_t ident;
1504 struct udf_sb_info *sbi = UDF_SB(sb);
1505 struct logicalVolIntegrityDesc *lvid;
1506
1507 while (loc.extLength > 0 &&
1508 (bh = udf_read_tagged(sb, loc.extLocation,
1509 loc.extLocation, &ident)) &&
1510 ident == TAG_IDENT_LVID) {
1511 sbi->s_lvid_bh = bh;
1512 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1513
1514 if (lvid->nextIntegrityExt.extLength)
1515 udf_load_logicalvolint(sb,
1516 leea_to_cpu(lvid->nextIntegrityExt));
1517
1518 if (sbi->s_lvid_bh != bh)
1519 brelse(bh);
1520 loc.extLength -= sb->s_blocksize;
1521 loc.extLocation++;
1522 }
1523 if (sbi->s_lvid_bh != bh)
1524 brelse(bh);
1525 }
1526
1527 /*
1528 * Process a main/reserve volume descriptor sequence.
1529 * @block First block of first extent of the sequence.
1530 * @lastblock Lastblock of first extent of the sequence.
1531 * @fileset There we store extent containing root fileset
1532 *
1533 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1534 * sequence
1535 */
1536 static noinline int udf_process_sequence(
1537 struct super_block *sb,
1538 sector_t block, sector_t lastblock,
1539 struct kernel_lb_addr *fileset)
1540 {
1541 struct buffer_head *bh = NULL;
1542 struct udf_vds_record vds[VDS_POS_LENGTH];
1543 struct udf_vds_record *curr;
1544 struct generic_desc *gd;
1545 struct volDescPtr *vdp;
1546 int done = 0;
1547 uint32_t vdsn;
1548 uint16_t ident;
1549 long next_s = 0, next_e = 0;
1550 int ret;
1551
1552 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1553
1554 /*
1555 * Read the main descriptor sequence and find which descriptors
1556 * are in it.
1557 */
1558 for (; (!done && block <= lastblock); block++) {
1559
1560 bh = udf_read_tagged(sb, block, block, &ident);
1561 if (!bh) {
1562 udf_err(sb,
1563 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1564 (unsigned long long)block);
1565 return -EAGAIN;
1566 }
1567
1568 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1569 gd = (struct generic_desc *)bh->b_data;
1570 vdsn = le32_to_cpu(gd->volDescSeqNum);
1571 switch (ident) {
1572 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1573 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1574 if (vdsn >= curr->volDescSeqNum) {
1575 curr->volDescSeqNum = vdsn;
1576 curr->block = block;
1577 }
1578 break;
1579 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1580 curr = &vds[VDS_POS_VOL_DESC_PTR];
1581 if (vdsn >= curr->volDescSeqNum) {
1582 curr->volDescSeqNum = vdsn;
1583 curr->block = block;
1584
1585 vdp = (struct volDescPtr *)bh->b_data;
1586 next_s = le32_to_cpu(
1587 vdp->nextVolDescSeqExt.extLocation);
1588 next_e = le32_to_cpu(
1589 vdp->nextVolDescSeqExt.extLength);
1590 next_e = next_e >> sb->s_blocksize_bits;
1591 next_e += next_s;
1592 }
1593 break;
1594 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1595 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1596 if (vdsn >= curr->volDescSeqNum) {
1597 curr->volDescSeqNum = vdsn;
1598 curr->block = block;
1599 }
1600 break;
1601 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1602 curr = &vds[VDS_POS_PARTITION_DESC];
1603 if (!curr->block)
1604 curr->block = block;
1605 break;
1606 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1607 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1608 if (vdsn >= curr->volDescSeqNum) {
1609 curr->volDescSeqNum = vdsn;
1610 curr->block = block;
1611 }
1612 break;
1613 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1614 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1615 if (vdsn >= curr->volDescSeqNum) {
1616 curr->volDescSeqNum = vdsn;
1617 curr->block = block;
1618 }
1619 break;
1620 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1621 vds[VDS_POS_TERMINATING_DESC].block = block;
1622 if (next_e) {
1623 block = next_s;
1624 lastblock = next_e;
1625 next_s = next_e = 0;
1626 } else
1627 done = 1;
1628 break;
1629 }
1630 brelse(bh);
1631 }
1632 /*
1633 * Now read interesting descriptors again and process them
1634 * in a suitable order
1635 */
1636 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1637 udf_err(sb, "Primary Volume Descriptor not found!\n");
1638 return -EAGAIN;
1639 }
1640 ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1641 if (ret < 0)
1642 return ret;
1643
1644 if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1645 ret = udf_load_logicalvol(sb,
1646 vds[VDS_POS_LOGICAL_VOL_DESC].block,
1647 fileset);
1648 if (ret < 0)
1649 return ret;
1650 }
1651
1652 if (vds[VDS_POS_PARTITION_DESC].block) {
1653 /*
1654 * We rescan the whole descriptor sequence to find
1655 * partition descriptor blocks and process them.
1656 */
1657 for (block = vds[VDS_POS_PARTITION_DESC].block;
1658 block < vds[VDS_POS_TERMINATING_DESC].block;
1659 block++) {
1660 ret = udf_load_partdesc(sb, block);
1661 if (ret < 0)
1662 return ret;
1663 }
1664 }
1665
1666 return 0;
1667 }
1668
1669 /*
1670 * Load Volume Descriptor Sequence described by anchor in bh
1671 *
1672 * Returns <0 on error, 0 on success
1673 */
1674 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1675 struct kernel_lb_addr *fileset)
1676 {
1677 struct anchorVolDescPtr *anchor;
1678 sector_t main_s, main_e, reserve_s, reserve_e;
1679 int ret;
1680
1681 anchor = (struct anchorVolDescPtr *)bh->b_data;
1682
1683 /* Locate the main sequence */
1684 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1685 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1686 main_e = main_e >> sb->s_blocksize_bits;
1687 main_e += main_s;
1688
1689 /* Locate the reserve sequence */
1690 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1691 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1692 reserve_e = reserve_e >> sb->s_blocksize_bits;
1693 reserve_e += reserve_s;
1694
1695 /* Process the main & reserve sequences */
1696 /* responsible for finding the PartitionDesc(s) */
1697 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1698 if (ret != -EAGAIN)
1699 return ret;
1700 udf_sb_free_partitions(sb);
1701 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1702 if (ret < 0) {
1703 udf_sb_free_partitions(sb);
1704 /* No sequence was OK, return -EIO */
1705 if (ret == -EAGAIN)
1706 ret = -EIO;
1707 }
1708 return ret;
1709 }
1710
1711 /*
1712 * Check whether there is an anchor block in the given block and
1713 * load Volume Descriptor Sequence if so.
1714 *
1715 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1716 * block
1717 */
1718 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1719 struct kernel_lb_addr *fileset)
1720 {
1721 struct buffer_head *bh;
1722 uint16_t ident;
1723 int ret;
1724
1725 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1726 udf_fixed_to_variable(block) >=
1727 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1728 return -EAGAIN;
1729
1730 bh = udf_read_tagged(sb, block, block, &ident);
1731 if (!bh)
1732 return -EAGAIN;
1733 if (ident != TAG_IDENT_AVDP) {
1734 brelse(bh);
1735 return -EAGAIN;
1736 }
1737 ret = udf_load_sequence(sb, bh, fileset);
1738 brelse(bh);
1739 return ret;
1740 }
1741
1742 /*
1743 * Search for an anchor volume descriptor pointer.
1744 *
1745 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1746 * of anchors.
1747 */
1748 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1749 struct kernel_lb_addr *fileset)
1750 {
1751 sector_t last[6];
1752 int i;
1753 struct udf_sb_info *sbi = UDF_SB(sb);
1754 int last_count = 0;
1755 int ret;
1756
1757 /* First try user provided anchor */
1758 if (sbi->s_anchor) {
1759 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1760 if (ret != -EAGAIN)
1761 return ret;
1762 }
1763 /*
1764 * according to spec, anchor is in either:
1765 * block 256
1766 * lastblock-256
1767 * lastblock
1768 * however, if the disc isn't closed, it could be 512.
1769 */
1770 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1771 if (ret != -EAGAIN)
1772 return ret;
1773 /*
1774 * The trouble is which block is the last one. Drives often misreport
1775 * this so we try various possibilities.
1776 */
1777 last[last_count++] = *lastblock;
1778 if (*lastblock >= 1)
1779 last[last_count++] = *lastblock - 1;
1780 last[last_count++] = *lastblock + 1;
1781 if (*lastblock >= 2)
1782 last[last_count++] = *lastblock - 2;
1783 if (*lastblock >= 150)
1784 last[last_count++] = *lastblock - 150;
1785 if (*lastblock >= 152)
1786 last[last_count++] = *lastblock - 152;
1787
1788 for (i = 0; i < last_count; i++) {
1789 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1790 sb->s_blocksize_bits)
1791 continue;
1792 ret = udf_check_anchor_block(sb, last[i], fileset);
1793 if (ret != -EAGAIN) {
1794 if (!ret)
1795 *lastblock = last[i];
1796 return ret;
1797 }
1798 if (last[i] < 256)
1799 continue;
1800 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1801 if (ret != -EAGAIN) {
1802 if (!ret)
1803 *lastblock = last[i];
1804 return ret;
1805 }
1806 }
1807
1808 /* Finally try block 512 in case media is open */
1809 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1810 }
1811
1812 /*
1813 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1814 * area specified by it. The function expects sbi->s_lastblock to be the last
1815 * block on the media.
1816 *
1817 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1818 * was not found.
1819 */
1820 static int udf_find_anchor(struct super_block *sb,
1821 struct kernel_lb_addr *fileset)
1822 {
1823 struct udf_sb_info *sbi = UDF_SB(sb);
1824 sector_t lastblock = sbi->s_last_block;
1825 int ret;
1826
1827 ret = udf_scan_anchors(sb, &lastblock, fileset);
1828 if (ret != -EAGAIN)
1829 goto out;
1830
1831 /* No anchor found? Try VARCONV conversion of block numbers */
1832 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1833 lastblock = udf_variable_to_fixed(sbi->s_last_block);
1834 /* Firstly, we try to not convert number of the last block */
1835 ret = udf_scan_anchors(sb, &lastblock, fileset);
1836 if (ret != -EAGAIN)
1837 goto out;
1838
1839 lastblock = sbi->s_last_block;
1840 /* Secondly, we try with converted number of the last block */
1841 ret = udf_scan_anchors(sb, &lastblock, fileset);
1842 if (ret < 0) {
1843 /* VARCONV didn't help. Clear it. */
1844 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1845 }
1846 out:
1847 if (ret == 0)
1848 sbi->s_last_block = lastblock;
1849 return ret;
1850 }
1851
1852 /*
1853 * Check Volume Structure Descriptor, find Anchor block and load Volume
1854 * Descriptor Sequence.
1855 *
1856 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1857 * block was not found.
1858 */
1859 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1860 int silent, struct kernel_lb_addr *fileset)
1861 {
1862 struct udf_sb_info *sbi = UDF_SB(sb);
1863 loff_t nsr_off;
1864 int ret;
1865
1866 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1867 if (!silent)
1868 udf_warn(sb, "Bad block size\n");
1869 return -EINVAL;
1870 }
1871 sbi->s_last_block = uopt->lastblock;
1872 if (!uopt->novrs) {
1873 /* Check that it is NSR02 compliant */
1874 nsr_off = udf_check_vsd(sb);
1875 if (!nsr_off) {
1876 if (!silent)
1877 udf_warn(sb, "No VRS found\n");
1878 return 0;
1879 }
1880 if (nsr_off == -1)
1881 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1882 if (!sbi->s_last_block)
1883 sbi->s_last_block = udf_get_last_block(sb);
1884 } else {
1885 udf_debug("Validity check skipped because of novrs option\n");
1886 }
1887
1888 /* Look for anchor block and load Volume Descriptor Sequence */
1889 sbi->s_anchor = uopt->anchor;
1890 ret = udf_find_anchor(sb, fileset);
1891 if (ret < 0) {
1892 if (!silent && ret == -EAGAIN)
1893 udf_warn(sb, "No anchor found\n");
1894 return ret;
1895 }
1896 return 0;
1897 }
1898
1899 static void udf_open_lvid(struct super_block *sb)
1900 {
1901 struct udf_sb_info *sbi = UDF_SB(sb);
1902 struct buffer_head *bh = sbi->s_lvid_bh;
1903 struct logicalVolIntegrityDesc *lvid;
1904 struct logicalVolIntegrityDescImpUse *lvidiu;
1905
1906 if (!bh)
1907 return;
1908
1909 mutex_lock(&sbi->s_alloc_mutex);
1910 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1911 lvidiu = udf_sb_lvidiu(sbi);
1912
1913 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1914 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1915 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1916 CURRENT_TIME);
1917 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1918
1919 lvid->descTag.descCRC = cpu_to_le16(
1920 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1921 le16_to_cpu(lvid->descTag.descCRCLength)));
1922
1923 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1924 mark_buffer_dirty(bh);
1925 sbi->s_lvid_dirty = 0;
1926 mutex_unlock(&sbi->s_alloc_mutex);
1927 /* Make opening of filesystem visible on the media immediately */
1928 sync_dirty_buffer(bh);
1929 }
1930
1931 static void udf_close_lvid(struct super_block *sb)
1932 {
1933 struct udf_sb_info *sbi = UDF_SB(sb);
1934 struct buffer_head *bh = sbi->s_lvid_bh;
1935 struct logicalVolIntegrityDesc *lvid;
1936 struct logicalVolIntegrityDescImpUse *lvidiu;
1937
1938 if (!bh)
1939 return;
1940
1941 mutex_lock(&sbi->s_alloc_mutex);
1942 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1943 lvidiu = udf_sb_lvidiu(sbi);
1944 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1945 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1946 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1947 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1948 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1949 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1950 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1951 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1952 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1953 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1954
1955 lvid->descTag.descCRC = cpu_to_le16(
1956 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1957 le16_to_cpu(lvid->descTag.descCRCLength)));
1958
1959 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1960 /*
1961 * We set buffer uptodate unconditionally here to avoid spurious
1962 * warnings from mark_buffer_dirty() when previous EIO has marked
1963 * the buffer as !uptodate
1964 */
1965 set_buffer_uptodate(bh);
1966 mark_buffer_dirty(bh);
1967 sbi->s_lvid_dirty = 0;
1968 mutex_unlock(&sbi->s_alloc_mutex);
1969 /* Make closing of filesystem visible on the media immediately */
1970 sync_dirty_buffer(bh);
1971 }
1972
1973 u64 lvid_get_unique_id(struct super_block *sb)
1974 {
1975 struct buffer_head *bh;
1976 struct udf_sb_info *sbi = UDF_SB(sb);
1977 struct logicalVolIntegrityDesc *lvid;
1978 struct logicalVolHeaderDesc *lvhd;
1979 u64 uniqueID;
1980 u64 ret;
1981
1982 bh = sbi->s_lvid_bh;
1983 if (!bh)
1984 return 0;
1985
1986 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1987 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1988
1989 mutex_lock(&sbi->s_alloc_mutex);
1990 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1991 if (!(++uniqueID & 0xFFFFFFFF))
1992 uniqueID += 16;
1993 lvhd->uniqueID = cpu_to_le64(uniqueID);
1994 mutex_unlock(&sbi->s_alloc_mutex);
1995 mark_buffer_dirty(bh);
1996
1997 return ret;
1998 }
1999
2000 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2001 {
2002 int ret = -EINVAL;
2003 struct inode *inode = NULL;
2004 struct udf_options uopt;
2005 struct kernel_lb_addr rootdir, fileset;
2006 struct udf_sb_info *sbi;
2007
2008 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2009 uopt.uid = INVALID_UID;
2010 uopt.gid = INVALID_GID;
2011 uopt.umask = 0;
2012 uopt.fmode = UDF_INVALID_MODE;
2013 uopt.dmode = UDF_INVALID_MODE;
2014
2015 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2016 if (!sbi)
2017 return -ENOMEM;
2018
2019 sb->s_fs_info = sbi;
2020
2021 mutex_init(&sbi->s_alloc_mutex);
2022
2023 if (!udf_parse_options((char *)options, &uopt, false))
2024 goto error_out;
2025
2026 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2027 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2028 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2029 goto error_out;
2030 }
2031 #ifdef CONFIG_UDF_NLS
2032 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2033 uopt.nls_map = load_nls_default();
2034 if (!uopt.nls_map)
2035 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2036 else
2037 udf_debug("Using default NLS map\n");
2038 }
2039 #endif
2040 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2041 uopt.flags |= (1 << UDF_FLAG_UTF8);
2042
2043 fileset.logicalBlockNum = 0xFFFFFFFF;
2044 fileset.partitionReferenceNum = 0xFFFF;
2045
2046 sbi->s_flags = uopt.flags;
2047 sbi->s_uid = uopt.uid;
2048 sbi->s_gid = uopt.gid;
2049 sbi->s_umask = uopt.umask;
2050 sbi->s_fmode = uopt.fmode;
2051 sbi->s_dmode = uopt.dmode;
2052 sbi->s_nls_map = uopt.nls_map;
2053 rwlock_init(&sbi->s_cred_lock);
2054
2055 if (uopt.session == 0xFFFFFFFF)
2056 sbi->s_session = udf_get_last_session(sb);
2057 else
2058 sbi->s_session = uopt.session;
2059
2060 udf_debug("Multi-session=%d\n", sbi->s_session);
2061
2062 /* Fill in the rest of the superblock */
2063 sb->s_op = &udf_sb_ops;
2064 sb->s_export_op = &udf_export_ops;
2065
2066 sb->s_magic = UDF_SUPER_MAGIC;
2067 sb->s_time_gran = 1000;
2068
2069 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2070 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2071 } else {
2072 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2073 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2074 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2075 if (!silent)
2076 pr_notice("Rescanning with blocksize %d\n",
2077 UDF_DEFAULT_BLOCKSIZE);
2078 brelse(sbi->s_lvid_bh);
2079 sbi->s_lvid_bh = NULL;
2080 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2081 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2082 }
2083 }
2084 if (ret < 0) {
2085 if (ret == -EAGAIN) {
2086 udf_warn(sb, "No partition found (1)\n");
2087 ret = -EINVAL;
2088 }
2089 goto error_out;
2090 }
2091
2092 udf_debug("Lastblock=%d\n", sbi->s_last_block);
2093
2094 if (sbi->s_lvid_bh) {
2095 struct logicalVolIntegrityDescImpUse *lvidiu =
2096 udf_sb_lvidiu(sbi);
2097 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2098 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2099 /* uint16_t maxUDFWriteRev =
2100 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2101
2102 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2103 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2104 le16_to_cpu(lvidiu->minUDFReadRev),
2105 UDF_MAX_READ_VERSION);
2106 ret = -EINVAL;
2107 goto error_out;
2108 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2109 !(sb->s_flags & MS_RDONLY)) {
2110 ret = -EACCES;
2111 goto error_out;
2112 }
2113
2114 sbi->s_udfrev = minUDFWriteRev;
2115
2116 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2117 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2118 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2119 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2120 }
2121
2122 if (!sbi->s_partitions) {
2123 udf_warn(sb, "No partition found (2)\n");
2124 ret = -EINVAL;
2125 goto error_out;
2126 }
2127
2128 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2129 UDF_PART_FLAG_READ_ONLY &&
2130 !(sb->s_flags & MS_RDONLY)) {
2131 ret = -EACCES;
2132 goto error_out;
2133 }
2134
2135 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2136 udf_warn(sb, "No fileset found\n");
2137 ret = -EINVAL;
2138 goto error_out;
2139 }
2140
2141 if (!silent) {
2142 struct timestamp ts;
2143 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2144 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2145 sbi->s_volume_ident,
2146 le16_to_cpu(ts.year), ts.month, ts.day,
2147 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2148 }
2149 if (!(sb->s_flags & MS_RDONLY))
2150 udf_open_lvid(sb);
2151
2152 /* Assign the root inode */
2153 /* assign inodes by physical block number */
2154 /* perhaps it's not extensible enough, but for now ... */
2155 inode = udf_iget(sb, &rootdir);
2156 if (!inode) {
2157 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2158 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2159 ret = -EIO;
2160 goto error_out;
2161 }
2162
2163 /* Allocate a dentry for the root inode */
2164 sb->s_root = d_make_root(inode);
2165 if (!sb->s_root) {
2166 udf_err(sb, "Couldn't allocate root dentry\n");
2167 ret = -ENOMEM;
2168 goto error_out;
2169 }
2170 sb->s_maxbytes = MAX_LFS_FILESIZE;
2171 sb->s_max_links = UDF_MAX_LINKS;
2172 return 0;
2173
2174 error_out:
2175 if (sbi->s_vat_inode)
2176 iput(sbi->s_vat_inode);
2177 #ifdef CONFIG_UDF_NLS
2178 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2179 unload_nls(sbi->s_nls_map);
2180 #endif
2181 if (!(sb->s_flags & MS_RDONLY))
2182 udf_close_lvid(sb);
2183 brelse(sbi->s_lvid_bh);
2184 udf_sb_free_partitions(sb);
2185 kfree(sbi);
2186 sb->s_fs_info = NULL;
2187
2188 return ret;
2189 }
2190
2191 void _udf_err(struct super_block *sb, const char *function,
2192 const char *fmt, ...)
2193 {
2194 struct va_format vaf;
2195 va_list args;
2196
2197 va_start(args, fmt);
2198
2199 vaf.fmt = fmt;
2200 vaf.va = &args;
2201
2202 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2203
2204 va_end(args);
2205 }
2206
2207 void _udf_warn(struct super_block *sb, const char *function,
2208 const char *fmt, ...)
2209 {
2210 struct va_format vaf;
2211 va_list args;
2212
2213 va_start(args, fmt);
2214
2215 vaf.fmt = fmt;
2216 vaf.va = &args;
2217
2218 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2219
2220 va_end(args);
2221 }
2222
2223 static void udf_put_super(struct super_block *sb)
2224 {
2225 struct udf_sb_info *sbi;
2226
2227 sbi = UDF_SB(sb);
2228
2229 if (sbi->s_vat_inode)
2230 iput(sbi->s_vat_inode);
2231 #ifdef CONFIG_UDF_NLS
2232 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2233 unload_nls(sbi->s_nls_map);
2234 #endif
2235 if (!(sb->s_flags & MS_RDONLY))
2236 udf_close_lvid(sb);
2237 brelse(sbi->s_lvid_bh);
2238 udf_sb_free_partitions(sb);
2239 kfree(sb->s_fs_info);
2240 sb->s_fs_info = NULL;
2241 }
2242
2243 static int udf_sync_fs(struct super_block *sb, int wait)
2244 {
2245 struct udf_sb_info *sbi = UDF_SB(sb);
2246
2247 mutex_lock(&sbi->s_alloc_mutex);
2248 if (sbi->s_lvid_dirty) {
2249 /*
2250 * Blockdevice will be synced later so we don't have to submit
2251 * the buffer for IO
2252 */
2253 mark_buffer_dirty(sbi->s_lvid_bh);
2254 sbi->s_lvid_dirty = 0;
2255 }
2256 mutex_unlock(&sbi->s_alloc_mutex);
2257
2258 return 0;
2259 }
2260
2261 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2262 {
2263 struct super_block *sb = dentry->d_sb;
2264 struct udf_sb_info *sbi = UDF_SB(sb);
2265 struct logicalVolIntegrityDescImpUse *lvidiu;
2266 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2267
2268 if (sbi->s_lvid_bh != NULL)
2269 lvidiu = udf_sb_lvidiu(sbi);
2270 else
2271 lvidiu = NULL;
2272
2273 buf->f_type = UDF_SUPER_MAGIC;
2274 buf->f_bsize = sb->s_blocksize;
2275 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2276 buf->f_bfree = udf_count_free(sb);
2277 buf->f_bavail = buf->f_bfree;
2278 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2279 le32_to_cpu(lvidiu->numDirs)) : 0)
2280 + buf->f_bfree;
2281 buf->f_ffree = buf->f_bfree;
2282 buf->f_namelen = UDF_NAME_LEN - 2;
2283 buf->f_fsid.val[0] = (u32)id;
2284 buf->f_fsid.val[1] = (u32)(id >> 32);
2285
2286 return 0;
2287 }
2288
2289 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2290 struct udf_bitmap *bitmap)
2291 {
2292 struct buffer_head *bh = NULL;
2293 unsigned int accum = 0;
2294 int index;
2295 int block = 0, newblock;
2296 struct kernel_lb_addr loc;
2297 uint32_t bytes;
2298 uint8_t *ptr;
2299 uint16_t ident;
2300 struct spaceBitmapDesc *bm;
2301
2302 loc.logicalBlockNum = bitmap->s_extPosition;
2303 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2304 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2305
2306 if (!bh) {
2307 udf_err(sb, "udf_count_free failed\n");
2308 goto out;
2309 } else if (ident != TAG_IDENT_SBD) {
2310 brelse(bh);
2311 udf_err(sb, "udf_count_free failed\n");
2312 goto out;
2313 }
2314
2315 bm = (struct spaceBitmapDesc *)bh->b_data;
2316 bytes = le32_to_cpu(bm->numOfBytes);
2317 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2318 ptr = (uint8_t *)bh->b_data;
2319
2320 while (bytes > 0) {
2321 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2322 accum += bitmap_weight((const unsigned long *)(ptr + index),
2323 cur_bytes * 8);
2324 bytes -= cur_bytes;
2325 if (bytes) {
2326 brelse(bh);
2327 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2328 bh = udf_tread(sb, newblock);
2329 if (!bh) {
2330 udf_debug("read failed\n");
2331 goto out;
2332 }
2333 index = 0;
2334 ptr = (uint8_t *)bh->b_data;
2335 }
2336 }
2337 brelse(bh);
2338 out:
2339 return accum;
2340 }
2341
2342 static unsigned int udf_count_free_table(struct super_block *sb,
2343 struct inode *table)
2344 {
2345 unsigned int accum = 0;
2346 uint32_t elen;
2347 struct kernel_lb_addr eloc;
2348 int8_t etype;
2349 struct extent_position epos;
2350
2351 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2352 epos.block = UDF_I(table)->i_location;
2353 epos.offset = sizeof(struct unallocSpaceEntry);
2354 epos.bh = NULL;
2355
2356 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2357 accum += (elen >> table->i_sb->s_blocksize_bits);
2358
2359 brelse(epos.bh);
2360 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2361
2362 return accum;
2363 }
2364
2365 static unsigned int udf_count_free(struct super_block *sb)
2366 {
2367 unsigned int accum = 0;
2368 struct udf_sb_info *sbi;
2369 struct udf_part_map *map;
2370
2371 sbi = UDF_SB(sb);
2372 if (sbi->s_lvid_bh) {
2373 struct logicalVolIntegrityDesc *lvid =
2374 (struct logicalVolIntegrityDesc *)
2375 sbi->s_lvid_bh->b_data;
2376 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2377 accum = le32_to_cpu(
2378 lvid->freeSpaceTable[sbi->s_partition]);
2379 if (accum == 0xFFFFFFFF)
2380 accum = 0;
2381 }
2382 }
2383
2384 if (accum)
2385 return accum;
2386
2387 map = &sbi->s_partmaps[sbi->s_partition];
2388 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2389 accum += udf_count_free_bitmap(sb,
2390 map->s_uspace.s_bitmap);
2391 }
2392 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2393 accum += udf_count_free_bitmap(sb,
2394 map->s_fspace.s_bitmap);
2395 }
2396 if (accum)
2397 return accum;
2398
2399 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2400 accum += udf_count_free_table(sb,
2401 map->s_uspace.s_table);
2402 }
2403 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2404 accum += udf_count_free_table(sb,
2405 map->s_fspace.s_table);
2406 }
2407
2408 return accum;
2409 }
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