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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / fs / udf / super.c
blob3306b9f69bedbb5ba2cb4e11b180b2b75e947dd5
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 #define VSD_FIRST_SECTOR_OFFSET 32768
80 #define VSD_MAX_SECTOR_OFFSET 0x800000
81
82 enum { UDF_MAX_LINKS = 0xffff };
83
84 /* These are the "meat" - everything else is stuffing */
85 static int udf_fill_super(struct super_block *, void *, int);
86 static void udf_put_super(struct super_block *);
87 static int udf_sync_fs(struct super_block *, int);
88 static int udf_remount_fs(struct super_block *, int *, char *);
89 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
90 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
91 struct kernel_lb_addr *);
92 static void udf_load_fileset(struct super_block *, struct buffer_head *,
93 struct kernel_lb_addr *);
94 static void udf_open_lvid(struct super_block *);
95 static void udf_close_lvid(struct super_block *);
96 static unsigned int udf_count_free(struct super_block *);
97 static int udf_statfs(struct dentry *, struct kstatfs *);
98 static int udf_show_options(struct seq_file *, struct dentry *);
99
100 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
101 {
102 struct logicalVolIntegrityDesc *lvid;
103 unsigned int partnum;
104 unsigned int offset;
105
106 if (!UDF_SB(sb)->s_lvid_bh)
107 return NULL;
108 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
109 partnum = le32_to_cpu(lvid->numOfPartitions);
110 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
111 offsetof(struct logicalVolIntegrityDesc, impUse)) /
112 (2 * sizeof(uint32_t)) < partnum) {
113 udf_err(sb, "Logical volume integrity descriptor corrupted "
114 "(numOfPartitions = %u)!\n", partnum);
115 return NULL;
116 }
117 /* The offset is to skip freeSpaceTable and sizeTable arrays */
118 offset = partnum * 2 * sizeof(uint32_t);
119 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
120 }
121
122 /* UDF filesystem type */
123 static struct dentry *udf_mount(struct file_system_type *fs_type,
124 int flags, const char *dev_name, void *data)
125 {
126 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
127 }
128
129 static struct file_system_type udf_fstype = {
130 .owner = THIS_MODULE,
131 .name = "udf",
132 .mount = udf_mount,
133 .kill_sb = kill_block_super,
134 .fs_flags = FS_REQUIRES_DEV,
135 };
136 MODULE_ALIAS_FS("udf");
137
138 static struct kmem_cache *udf_inode_cachep;
139
140 static struct inode *udf_alloc_inode(struct super_block *sb)
141 {
142 struct udf_inode_info *ei;
143 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
144 if (!ei)
145 return NULL;
146
147 ei->i_unique = 0;
148 ei->i_lenExtents = 0;
149 ei->i_next_alloc_block = 0;
150 ei->i_next_alloc_goal = 0;
151 ei->i_strat4096 = 0;
152 init_rwsem(&ei->i_data_sem);
153 ei->cached_extent.lstart = -1;
154 spin_lock_init(&ei->i_extent_cache_lock);
155
156 return &ei->vfs_inode;
157 }
158
159 static void udf_i_callback(struct rcu_head *head)
160 {
161 struct inode *inode = container_of(head, struct inode, i_rcu);
162 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
163 }
164
165 static void udf_destroy_inode(struct inode *inode)
166 {
167 call_rcu(&inode->i_rcu, udf_i_callback);
168 }
169
170 static void init_once(void *foo)
171 {
172 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
173
174 ei->i_ext.i_data = NULL;
175 inode_init_once(&ei->vfs_inode);
176 }
177
178 static int init_inodecache(void)
179 {
180 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
181 sizeof(struct udf_inode_info),
182 0, (SLAB_RECLAIM_ACCOUNT |
183 SLAB_MEM_SPREAD),
184 init_once);
185 if (!udf_inode_cachep)
186 return -ENOMEM;
187 return 0;
188 }
189
190 static void destroy_inodecache(void)
191 {
192 /*
193 * Make sure all delayed rcu free inodes are flushed before we
194 * destroy cache.
195 */
196 rcu_barrier();
197 kmem_cache_destroy(udf_inode_cachep);
198 }
199
200 /* Superblock operations */
201 static const struct super_operations udf_sb_ops = {
202 .alloc_inode = udf_alloc_inode,
203 .destroy_inode = udf_destroy_inode,
204 .write_inode = udf_write_inode,
205 .evict_inode = udf_evict_inode,
206 .put_super = udf_put_super,
207 .sync_fs = udf_sync_fs,
208 .statfs = udf_statfs,
209 .remount_fs = udf_remount_fs,
210 .show_options = udf_show_options,
211 };
212
213 struct udf_options {
214 unsigned char novrs;
215 unsigned int blocksize;
216 unsigned int session;
217 unsigned int lastblock;
218 unsigned int anchor;
219 unsigned int volume;
220 unsigned short partition;
221 unsigned int fileset;
222 unsigned int rootdir;
223 unsigned int flags;
224 umode_t umask;
225 kgid_t gid;
226 kuid_t uid;
227 umode_t fmode;
228 umode_t dmode;
229 struct nls_table *nls_map;
230 };
231
232 static int __init init_udf_fs(void)
233 {
234 int err;
235
236 err = init_inodecache();
237 if (err)
238 goto out1;
239 err = register_filesystem(&udf_fstype);
240 if (err)
241 goto out;
242
243 return 0;
244
245 out:
246 destroy_inodecache();
247
248 out1:
249 return err;
250 }
251
252 static void __exit exit_udf_fs(void)
253 {
254 unregister_filesystem(&udf_fstype);
255 destroy_inodecache();
256 }
257
258 module_init(init_udf_fs)
259 module_exit(exit_udf_fs)
260
261 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
262 {
263 struct udf_sb_info *sbi = UDF_SB(sb);
264
265 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
266 GFP_KERNEL);
267 if (!sbi->s_partmaps) {
268 udf_err(sb, "Unable to allocate space for %d partition maps\n",
269 count);
270 sbi->s_partitions = 0;
271 return -ENOMEM;
272 }
273
274 sbi->s_partitions = count;
275 return 0;
276 }
277
278 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
279 {
280 int i;
281 int nr_groups = bitmap->s_nr_groups;
282 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
283 nr_groups);
284
285 for (i = 0; i < nr_groups; i++)
286 if (bitmap->s_block_bitmap[i])
287 brelse(bitmap->s_block_bitmap[i]);
288
289 if (size <= PAGE_SIZE)
290 kfree(bitmap);
291 else
292 vfree(bitmap);
293 }
294
295 static void udf_free_partition(struct udf_part_map *map)
296 {
297 int i;
298 struct udf_meta_data *mdata;
299
300 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
301 iput(map->s_uspace.s_table);
302 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
303 iput(map->s_fspace.s_table);
304 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
305 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
306 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
307 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
308 if (map->s_partition_type == UDF_SPARABLE_MAP15)
309 for (i = 0; i < 4; i++)
310 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
311 else if (map->s_partition_type == UDF_METADATA_MAP25) {
312 mdata = &map->s_type_specific.s_metadata;
313 iput(mdata->s_metadata_fe);
314 mdata->s_metadata_fe = NULL;
315
316 iput(mdata->s_mirror_fe);
317 mdata->s_mirror_fe = NULL;
318
319 iput(mdata->s_bitmap_fe);
320 mdata->s_bitmap_fe = NULL;
321 }
322 }
323
324 static void udf_sb_free_partitions(struct super_block *sb)
325 {
326 struct udf_sb_info *sbi = UDF_SB(sb);
327 int i;
328 if (sbi->s_partmaps == NULL)
329 return;
330 for (i = 0; i < sbi->s_partitions; i++)
331 udf_free_partition(&sbi->s_partmaps[i]);
332 kfree(sbi->s_partmaps);
333 sbi->s_partmaps = NULL;
334 }
335
336 static int udf_show_options(struct seq_file *seq, struct dentry *root)
337 {
338 struct super_block *sb = root->d_sb;
339 struct udf_sb_info *sbi = UDF_SB(sb);
340
341 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
342 seq_puts(seq, ",nostrict");
343 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
344 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
345 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
346 seq_puts(seq, ",unhide");
347 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
348 seq_puts(seq, ",undelete");
349 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
350 seq_puts(seq, ",noadinicb");
351 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
352 seq_puts(seq, ",shortad");
353 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
354 seq_puts(seq, ",uid=forget");
355 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
356 seq_puts(seq, ",uid=ignore");
357 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
358 seq_puts(seq, ",gid=forget");
359 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
360 seq_puts(seq, ",gid=ignore");
361 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
362 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
363 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
364 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
365 if (sbi->s_umask != 0)
366 seq_printf(seq, ",umask=%ho", sbi->s_umask);
367 if (sbi->s_fmode != UDF_INVALID_MODE)
368 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
369 if (sbi->s_dmode != UDF_INVALID_MODE)
370 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
371 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
372 seq_printf(seq, ",session=%u", sbi->s_session);
373 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
374 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
375 if (sbi->s_anchor != 0)
376 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
377 /*
378 * volume, partition, fileset and rootdir seem to be ignored
379 * currently
380 */
381 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
382 seq_puts(seq, ",utf8");
383 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
384 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
385
386 return 0;
387 }
388
389 /*
390 * udf_parse_options
391 *
392 * PURPOSE
393 * Parse mount options.
394 *
395 * DESCRIPTION
396 * The following mount options are supported:
397 *
398 * gid= Set the default group.
399 * umask= Set the default umask.
400 * mode= Set the default file permissions.
401 * dmode= Set the default directory permissions.
402 * uid= Set the default user.
403 * bs= Set the block size.
404 * unhide Show otherwise hidden files.
405 * undelete Show deleted files in lists.
406 * adinicb Embed data in the inode (default)
407 * noadinicb Don't embed data in the inode
408 * shortad Use short ad's
409 * longad Use long ad's (default)
410 * nostrict Unset strict conformance
411 * iocharset= Set the NLS character set
412 *
413 * The remaining are for debugging and disaster recovery:
414 *
415 * novrs Skip volume sequence recognition
416 *
417 * The following expect a offset from 0.
418 *
419 * session= Set the CDROM session (default= last session)
420 * anchor= Override standard anchor location. (default= 256)
421 * volume= Override the VolumeDesc location. (unused)
422 * partition= Override the PartitionDesc location. (unused)
423 * lastblock= Set the last block of the filesystem/
424 *
425 * The following expect a offset from the partition root.
426 *
427 * fileset= Override the fileset block location. (unused)
428 * rootdir= Override the root directory location. (unused)
429 * WARNING: overriding the rootdir to a non-directory may
430 * yield highly unpredictable results.
431 *
432 * PRE-CONDITIONS
433 * options Pointer to mount options string.
434 * uopts Pointer to mount options variable.
435 *
436 * POST-CONDITIONS
437 * <return> 1 Mount options parsed okay.
438 * <return> 0 Error parsing mount options.
439 *
440 * HISTORY
441 * July 1, 1997 - Andrew E. Mileski
442 * Written, tested, and released.
443 */
444
445 enum {
446 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
447 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
448 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
449 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
450 Opt_rootdir, Opt_utf8, Opt_iocharset,
451 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
452 Opt_fmode, Opt_dmode
453 };
454
455 static const match_table_t tokens = {
456 {Opt_novrs, "novrs"},
457 {Opt_nostrict, "nostrict"},
458 {Opt_bs, "bs=%u"},
459 {Opt_unhide, "unhide"},
460 {Opt_undelete, "undelete"},
461 {Opt_noadinicb, "noadinicb"},
462 {Opt_adinicb, "adinicb"},
463 {Opt_shortad, "shortad"},
464 {Opt_longad, "longad"},
465 {Opt_uforget, "uid=forget"},
466 {Opt_uignore, "uid=ignore"},
467 {Opt_gforget, "gid=forget"},
468 {Opt_gignore, "gid=ignore"},
469 {Opt_gid, "gid=%u"},
470 {Opt_uid, "uid=%u"},
471 {Opt_umask, "umask=%o"},
472 {Opt_session, "session=%u"},
473 {Opt_lastblock, "lastblock=%u"},
474 {Opt_anchor, "anchor=%u"},
475 {Opt_volume, "volume=%u"},
476 {Opt_partition, "partition=%u"},
477 {Opt_fileset, "fileset=%u"},
478 {Opt_rootdir, "rootdir=%u"},
479 {Opt_utf8, "utf8"},
480 {Opt_iocharset, "iocharset=%s"},
481 {Opt_fmode, "mode=%o"},
482 {Opt_dmode, "dmode=%o"},
483 {Opt_err, NULL}
484 };
485
486 static int udf_parse_options(char *options, struct udf_options *uopt,
487 bool remount)
488 {
489 char *p;
490 int option;
491
492 uopt->novrs = 0;
493 uopt->partition = 0xFFFF;
494 uopt->session = 0xFFFFFFFF;
495 uopt->lastblock = 0;
496 uopt->anchor = 0;
497 uopt->volume = 0xFFFFFFFF;
498 uopt->rootdir = 0xFFFFFFFF;
499 uopt->fileset = 0xFFFFFFFF;
500 uopt->nls_map = NULL;
501
502 if (!options)
503 return 1;
504
505 while ((p = strsep(&options, ",")) != NULL) {
506 substring_t args[MAX_OPT_ARGS];
507 int token;
508 if (!*p)
509 continue;
510
511 token = match_token(p, tokens, args);
512 switch (token) {
513 case Opt_novrs:
514 uopt->novrs = 1;
515 break;
516 case Opt_bs:
517 if (match_int(&args[0], &option))
518 return 0;
519 uopt->blocksize = option;
520 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
521 break;
522 case Opt_unhide:
523 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
524 break;
525 case Opt_undelete:
526 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
527 break;
528 case Opt_noadinicb:
529 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
530 break;
531 case Opt_adinicb:
532 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
533 break;
534 case Opt_shortad:
535 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
536 break;
537 case Opt_longad:
538 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
539 break;
540 case Opt_gid:
541 if (match_int(args, &option))
542 return 0;
543 uopt->gid = make_kgid(current_user_ns(), option);
544 if (!gid_valid(uopt->gid))
545 return 0;
546 uopt->flags |= (1 << UDF_FLAG_GID_SET);
547 break;
548 case Opt_uid:
549 if (match_int(args, &option))
550 return 0;
551 uopt->uid = make_kuid(current_user_ns(), option);
552 if (!uid_valid(uopt->uid))
553 return 0;
554 uopt->flags |= (1 << UDF_FLAG_UID_SET);
555 break;
556 case Opt_umask:
557 if (match_octal(args, &option))
558 return 0;
559 uopt->umask = option;
560 break;
561 case Opt_nostrict:
562 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
563 break;
564 case Opt_session:
565 if (match_int(args, &option))
566 return 0;
567 uopt->session = option;
568 if (!remount)
569 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
570 break;
571 case Opt_lastblock:
572 if (match_int(args, &option))
573 return 0;
574 uopt->lastblock = option;
575 if (!remount)
576 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
577 break;
578 case Opt_anchor:
579 if (match_int(args, &option))
580 return 0;
581 uopt->anchor = option;
582 break;
583 case Opt_volume:
584 if (match_int(args, &option))
585 return 0;
586 uopt->volume = option;
587 break;
588 case Opt_partition:
589 if (match_int(args, &option))
590 return 0;
591 uopt->partition = option;
592 break;
593 case Opt_fileset:
594 if (match_int(args, &option))
595 return 0;
596 uopt->fileset = option;
597 break;
598 case Opt_rootdir:
599 if (match_int(args, &option))
600 return 0;
601 uopt->rootdir = option;
602 break;
603 case Opt_utf8:
604 uopt->flags |= (1 << UDF_FLAG_UTF8);
605 break;
606 #ifdef CONFIG_UDF_NLS
607 case Opt_iocharset:
608 uopt->nls_map = load_nls(args[0].from);
609 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
610 break;
611 #endif
612 case Opt_uignore:
613 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
614 break;
615 case Opt_uforget:
616 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
617 break;
618 case Opt_gignore:
619 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
620 break;
621 case Opt_gforget:
622 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
623 break;
624 case Opt_fmode:
625 if (match_octal(args, &option))
626 return 0;
627 uopt->fmode = option & 0777;
628 break;
629 case Opt_dmode:
630 if (match_octal(args, &option))
631 return 0;
632 uopt->dmode = option & 0777;
633 break;
634 default:
635 pr_err("bad mount option \"%s\" or missing value\n", p);
636 return 0;
637 }
638 }
639 return 1;
640 }
641
642 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
643 {
644 struct udf_options uopt;
645 struct udf_sb_info *sbi = UDF_SB(sb);
646 int error = 0;
647 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
648
649 if (lvidiu) {
650 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
651 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
652 return -EACCES;
653 }
654
655 uopt.flags = sbi->s_flags;
656 uopt.uid = sbi->s_uid;
657 uopt.gid = sbi->s_gid;
658 uopt.umask = sbi->s_umask;
659 uopt.fmode = sbi->s_fmode;
660 uopt.dmode = sbi->s_dmode;
661
662 if (!udf_parse_options(options, &uopt, true))
663 return -EINVAL;
664
665 write_lock(&sbi->s_cred_lock);
666 sbi->s_flags = uopt.flags;
667 sbi->s_uid = uopt.uid;
668 sbi->s_gid = uopt.gid;
669 sbi->s_umask = uopt.umask;
670 sbi->s_fmode = uopt.fmode;
671 sbi->s_dmode = uopt.dmode;
672 write_unlock(&sbi->s_cred_lock);
673
674 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
675 goto out_unlock;
676
677 if (*flags & MS_RDONLY)
678 udf_close_lvid(sb);
679 else
680 udf_open_lvid(sb);
681
682 out_unlock:
683 return error;
684 }
685
686 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
687 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
688 static loff_t udf_check_vsd(struct super_block *sb)
689 {
690 struct volStructDesc *vsd = NULL;
691 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
692 int sectorsize;
693 struct buffer_head *bh = NULL;
694 int nsr02 = 0;
695 int nsr03 = 0;
696 struct udf_sb_info *sbi;
697
698 sbi = UDF_SB(sb);
699 if (sb->s_blocksize < sizeof(struct volStructDesc))
700 sectorsize = sizeof(struct volStructDesc);
701 else
702 sectorsize = sb->s_blocksize;
703
704 sector += (sbi->s_session << sb->s_blocksize_bits);
705
706 udf_debug("Starting at sector %u (%ld byte sectors)\n",
707 (unsigned int)(sector >> sb->s_blocksize_bits),
708 sb->s_blocksize);
709 /* Process the sequence (if applicable). The hard limit on the sector
710 * offset is arbitrary, hopefully large enough so that all valid UDF
711 * filesystems will be recognised. There is no mention of an upper
712 * bound to the size of the volume recognition area in the standard.
713 * The limit will prevent the code to read all the sectors of a
714 * specially crafted image (like a bluray disc full of CD001 sectors),
715 * potentially causing minutes or even hours of uninterruptible I/O
716 * activity. This actually happened with uninitialised SSD partitions
717 * (all 0xFF) before the check for the limit and all valid IDs were
718 * added */
719 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
720 sector += sectorsize) {
721 /* Read a block */
722 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
723 if (!bh)
724 break;
725
726 /* Look for ISO descriptors */
727 vsd = (struct volStructDesc *)(bh->b_data +
728 (sector & (sb->s_blocksize - 1)));
729
730 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
731 VSD_STD_ID_LEN)) {
732 switch (vsd->structType) {
733 case 0:
734 udf_debug("ISO9660 Boot Record found\n");
735 break;
736 case 1:
737 udf_debug("ISO9660 Primary Volume Descriptor found\n");
738 break;
739 case 2:
740 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
741 break;
742 case 3:
743 udf_debug("ISO9660 Volume Partition Descriptor found\n");
744 break;
745 case 255:
746 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
747 break;
748 default:
749 udf_debug("ISO9660 VRS (%u) found\n",
750 vsd->structType);
751 break;
752 }
753 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
754 VSD_STD_ID_LEN))
755 ; /* nothing */
756 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
757 VSD_STD_ID_LEN)) {
758 brelse(bh);
759 break;
760 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
761 VSD_STD_ID_LEN))
762 nsr02 = sector;
763 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
764 VSD_STD_ID_LEN))
765 nsr03 = sector;
766 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
767 VSD_STD_ID_LEN))
768 ; /* nothing */
769 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
770 VSD_STD_ID_LEN))
771 ; /* nothing */
772 else {
773 /* invalid id : end of volume recognition area */
774 brelse(bh);
775 break;
776 }
777 brelse(bh);
778 }
779
780 if (nsr03)
781 return nsr03;
782 else if (nsr02)
783 return nsr02;
784 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
785 VSD_FIRST_SECTOR_OFFSET)
786 return -1;
787 else
788 return 0;
789 }
790
791 static int udf_find_fileset(struct super_block *sb,
792 struct kernel_lb_addr *fileset,
793 struct kernel_lb_addr *root)
794 {
795 struct buffer_head *bh = NULL;
796 long lastblock;
797 uint16_t ident;
798 struct udf_sb_info *sbi;
799
800 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
801 fileset->partitionReferenceNum != 0xFFFF) {
802 bh = udf_read_ptagged(sb, fileset, 0, &ident);
803
804 if (!bh) {
805 return 1;
806 } else if (ident != TAG_IDENT_FSD) {
807 brelse(bh);
808 return 1;
809 }
810
811 }
812
813 sbi = UDF_SB(sb);
814 if (!bh) {
815 /* Search backwards through the partitions */
816 struct kernel_lb_addr newfileset;
817
818 /* --> cvg: FIXME - is it reasonable? */
819 return 1;
820
821 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
822 (newfileset.partitionReferenceNum != 0xFFFF &&
823 fileset->logicalBlockNum == 0xFFFFFFFF &&
824 fileset->partitionReferenceNum == 0xFFFF);
825 newfileset.partitionReferenceNum--) {
826 lastblock = sbi->s_partmaps
827 [newfileset.partitionReferenceNum]
828 .s_partition_len;
829 newfileset.logicalBlockNum = 0;
830
831 do {
832 bh = udf_read_ptagged(sb, &newfileset, 0,
833 &ident);
834 if (!bh) {
835 newfileset.logicalBlockNum++;
836 continue;
837 }
838
839 switch (ident) {
840 case TAG_IDENT_SBD:
841 {
842 struct spaceBitmapDesc *sp;
843 sp = (struct spaceBitmapDesc *)
844 bh->b_data;
845 newfileset.logicalBlockNum += 1 +
846 ((le32_to_cpu(sp->numOfBytes) +
847 sizeof(struct spaceBitmapDesc)
848 - 1) >> sb->s_blocksize_bits);
849 brelse(bh);
850 break;
851 }
852 case TAG_IDENT_FSD:
853 *fileset = newfileset;
854 break;
855 default:
856 newfileset.logicalBlockNum++;
857 brelse(bh);
858 bh = NULL;
859 break;
860 }
861 } while (newfileset.logicalBlockNum < lastblock &&
862 fileset->logicalBlockNum == 0xFFFFFFFF &&
863 fileset->partitionReferenceNum == 0xFFFF);
864 }
865 }
866
867 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
868 fileset->partitionReferenceNum != 0xFFFF) && bh) {
869 udf_debug("Fileset at block=%d, partition=%d\n",
870 fileset->logicalBlockNum,
871 fileset->partitionReferenceNum);
872
873 sbi->s_partition = fileset->partitionReferenceNum;
874 udf_load_fileset(sb, bh, root);
875 brelse(bh);
876 return 0;
877 }
878 return 1;
879 }
880
881 /*
882 * Load primary Volume Descriptor Sequence
883 *
884 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
885 * should be tried.
886 */
887 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
888 {
889 struct primaryVolDesc *pvoldesc;
890 struct ustr *instr, *outstr;
891 struct buffer_head *bh;
892 uint16_t ident;
893 int ret = -ENOMEM;
894
895 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
896 if (!instr)
897 return -ENOMEM;
898
899 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
900 if (!outstr)
901 goto out1;
902
903 bh = udf_read_tagged(sb, block, block, &ident);
904 if (!bh) {
905 ret = -EAGAIN;
906 goto out2;
907 }
908
909 if (ident != TAG_IDENT_PVD) {
910 ret = -EIO;
911 goto out_bh;
912 }
913
914 pvoldesc = (struct primaryVolDesc *)bh->b_data;
915
916 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
917 pvoldesc->recordingDateAndTime)) {
918 #ifdef UDFFS_DEBUG
919 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
920 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
921 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
922 ts->minute, le16_to_cpu(ts->typeAndTimezone));
923 #endif
924 }
925
926 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
927 if (udf_CS0toUTF8(outstr, instr)) {
928 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
929 outstr->u_len > 31 ? 31 : outstr->u_len);
930 udf_debug("volIdent[] = '%s'\n",
931 UDF_SB(sb)->s_volume_ident);
932 }
933
934 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
935 if (udf_CS0toUTF8(outstr, instr))
936 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
937
938 ret = 0;
939 out_bh:
940 brelse(bh);
941 out2:
942 kfree(outstr);
943 out1:
944 kfree(instr);
945 return ret;
946 }
947
948 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
949 u32 meta_file_loc, u32 partition_num)
950 {
951 struct kernel_lb_addr addr;
952 struct inode *metadata_fe;
953
954 addr.logicalBlockNum = meta_file_loc;
955 addr.partitionReferenceNum = partition_num;
956
957 metadata_fe = udf_iget(sb, &addr);
958
959 if (metadata_fe == NULL)
960 udf_warn(sb, "metadata inode efe not found\n");
961 else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
962 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
963 iput(metadata_fe);
964 metadata_fe = NULL;
965 }
966
967 return metadata_fe;
968 }
969
970 static int udf_load_metadata_files(struct super_block *sb, int partition)
971 {
972 struct udf_sb_info *sbi = UDF_SB(sb);
973 struct udf_part_map *map;
974 struct udf_meta_data *mdata;
975 struct kernel_lb_addr addr;
976
977 map = &sbi->s_partmaps[partition];
978 mdata = &map->s_type_specific.s_metadata;
979
980 /* metadata address */
981 udf_debug("Metadata file location: block = %d part = %d\n",
982 mdata->s_meta_file_loc, map->s_partition_num);
983
984 mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
985 mdata->s_meta_file_loc, map->s_partition_num);
986
987 if (mdata->s_metadata_fe == NULL) {
988 /* mirror file entry */
989 udf_debug("Mirror metadata file location: block = %d part = %d\n",
990 mdata->s_mirror_file_loc, map->s_partition_num);
991
992 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
993 mdata->s_mirror_file_loc, map->s_partition_num);
994
995 if (mdata->s_mirror_fe == NULL) {
996 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
997 return -EIO;
998 }
999 }
1000
1001 /*
1002 * bitmap file entry
1003 * Note:
1004 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1005 */
1006 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1007 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1008 addr.partitionReferenceNum = map->s_partition_num;
1009
1010 udf_debug("Bitmap file location: block = %d part = %d\n",
1011 addr.logicalBlockNum, addr.partitionReferenceNum);
1012
1013 mdata->s_bitmap_fe = udf_iget(sb, &addr);
1014 if (mdata->s_bitmap_fe == NULL) {
1015 if (sb->s_flags & MS_RDONLY)
1016 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1017 else {
1018 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1019 return -EIO;
1020 }
1021 }
1022 }
1023
1024 udf_debug("udf_load_metadata_files Ok\n");
1025 return 0;
1026 }
1027
1028 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1029 struct kernel_lb_addr *root)
1030 {
1031 struct fileSetDesc *fset;
1032
1033 fset = (struct fileSetDesc *)bh->b_data;
1034
1035 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1036
1037 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1038
1039 udf_debug("Rootdir at block=%d, partition=%d\n",
1040 root->logicalBlockNum, root->partitionReferenceNum);
1041 }
1042
1043 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1044 {
1045 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1046 return DIV_ROUND_UP(map->s_partition_len +
1047 (sizeof(struct spaceBitmapDesc) << 3),
1048 sb->s_blocksize * 8);
1049 }
1050
1051 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1052 {
1053 struct udf_bitmap *bitmap;
1054 int nr_groups;
1055 int size;
1056
1057 nr_groups = udf_compute_nr_groups(sb, index);
1058 size = sizeof(struct udf_bitmap) +
1059 (sizeof(struct buffer_head *) * nr_groups);
1060
1061 if (size <= PAGE_SIZE)
1062 bitmap = kzalloc(size, GFP_KERNEL);
1063 else
1064 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1065
1066 if (bitmap == NULL)
1067 return NULL;
1068
1069 bitmap->s_nr_groups = nr_groups;
1070 return bitmap;
1071 }
1072
1073 static int udf_fill_partdesc_info(struct super_block *sb,
1074 struct partitionDesc *p, int p_index)
1075 {
1076 struct udf_part_map *map;
1077 struct udf_sb_info *sbi = UDF_SB(sb);
1078 struct partitionHeaderDesc *phd;
1079
1080 map = &sbi->s_partmaps[p_index];
1081
1082 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1083 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1084
1085 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1086 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1087 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1088 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1089 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1090 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1091 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1092 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1093
1094 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1095 p_index, map->s_partition_type,
1096 map->s_partition_root, map->s_partition_len);
1097
1098 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1099 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1100 return 0;
1101
1102 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1103 if (phd->unallocSpaceTable.extLength) {
1104 struct kernel_lb_addr loc = {
1105 .logicalBlockNum = le32_to_cpu(
1106 phd->unallocSpaceTable.extPosition),
1107 .partitionReferenceNum = p_index,
1108 };
1109
1110 map->s_uspace.s_table = udf_iget(sb, &loc);
1111 if (!map->s_uspace.s_table) {
1112 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1113 p_index);
1114 return -EIO;
1115 }
1116 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1117 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1118 p_index, map->s_uspace.s_table->i_ino);
1119 }
1120
1121 if (phd->unallocSpaceBitmap.extLength) {
1122 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1123 if (!bitmap)
1124 return -ENOMEM;
1125 map->s_uspace.s_bitmap = bitmap;
1126 bitmap->s_extPosition = le32_to_cpu(
1127 phd->unallocSpaceBitmap.extPosition);
1128 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1129 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1130 p_index, bitmap->s_extPosition);
1131 }
1132
1133 if (phd->partitionIntegrityTable.extLength)
1134 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1135
1136 if (phd->freedSpaceTable.extLength) {
1137 struct kernel_lb_addr loc = {
1138 .logicalBlockNum = le32_to_cpu(
1139 phd->freedSpaceTable.extPosition),
1140 .partitionReferenceNum = p_index,
1141 };
1142
1143 map->s_fspace.s_table = udf_iget(sb, &loc);
1144 if (!map->s_fspace.s_table) {
1145 udf_debug("cannot load freedSpaceTable (part %d)\n",
1146 p_index);
1147 return -EIO;
1148 }
1149
1150 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1151 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1152 p_index, map->s_fspace.s_table->i_ino);
1153 }
1154
1155 if (phd->freedSpaceBitmap.extLength) {
1156 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1157 if (!bitmap)
1158 return -ENOMEM;
1159 map->s_fspace.s_bitmap = bitmap;
1160 bitmap->s_extPosition = le32_to_cpu(
1161 phd->freedSpaceBitmap.extPosition);
1162 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1163 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1164 p_index, bitmap->s_extPosition);
1165 }
1166 return 0;
1167 }
1168
1169 static void udf_find_vat_block(struct super_block *sb, int p_index,
1170 int type1_index, sector_t start_block)
1171 {
1172 struct udf_sb_info *sbi = UDF_SB(sb);
1173 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1174 sector_t vat_block;
1175 struct kernel_lb_addr ino;
1176
1177 /*
1178 * VAT file entry is in the last recorded block. Some broken disks have
1179 * it a few blocks before so try a bit harder...
1180 */
1181 ino.partitionReferenceNum = type1_index;
1182 for (vat_block = start_block;
1183 vat_block >= map->s_partition_root &&
1184 vat_block >= start_block - 3 &&
1185 !sbi->s_vat_inode; vat_block--) {
1186 ino.logicalBlockNum = vat_block - map->s_partition_root;
1187 sbi->s_vat_inode = udf_iget(sb, &ino);
1188 }
1189 }
1190
1191 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1192 {
1193 struct udf_sb_info *sbi = UDF_SB(sb);
1194 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1195 struct buffer_head *bh = NULL;
1196 struct udf_inode_info *vati;
1197 uint32_t pos;
1198 struct virtualAllocationTable20 *vat20;
1199 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1200
1201 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1202 if (!sbi->s_vat_inode &&
1203 sbi->s_last_block != blocks - 1) {
1204 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1205 (unsigned long)sbi->s_last_block,
1206 (unsigned long)blocks - 1);
1207 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1208 }
1209 if (!sbi->s_vat_inode)
1210 return -EIO;
1211
1212 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1213 map->s_type_specific.s_virtual.s_start_offset = 0;
1214 map->s_type_specific.s_virtual.s_num_entries =
1215 (sbi->s_vat_inode->i_size - 36) >> 2;
1216 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1217 vati = UDF_I(sbi->s_vat_inode);
1218 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1219 pos = udf_block_map(sbi->s_vat_inode, 0);
1220 bh = sb_bread(sb, pos);
1221 if (!bh)
1222 return -EIO;
1223 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1224 } else {
1225 vat20 = (struct virtualAllocationTable20 *)
1226 vati->i_ext.i_data;
1227 }
1228
1229 map->s_type_specific.s_virtual.s_start_offset =
1230 le16_to_cpu(vat20->lengthHeader);
1231 map->s_type_specific.s_virtual.s_num_entries =
1232 (sbi->s_vat_inode->i_size -
1233 map->s_type_specific.s_virtual.
1234 s_start_offset) >> 2;
1235 brelse(bh);
1236 }
1237 return 0;
1238 }
1239
1240 /*
1241 * Load partition descriptor block
1242 *
1243 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1244 * sequence.
1245 */
1246 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1247 {
1248 struct buffer_head *bh;
1249 struct partitionDesc *p;
1250 struct udf_part_map *map;
1251 struct udf_sb_info *sbi = UDF_SB(sb);
1252 int i, type1_idx;
1253 uint16_t partitionNumber;
1254 uint16_t ident;
1255 int ret;
1256
1257 bh = udf_read_tagged(sb, block, block, &ident);
1258 if (!bh)
1259 return -EAGAIN;
1260 if (ident != TAG_IDENT_PD) {
1261 ret = 0;
1262 goto out_bh;
1263 }
1264
1265 p = (struct partitionDesc *)bh->b_data;
1266 partitionNumber = le16_to_cpu(p->partitionNumber);
1267
1268 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1269 for (i = 0; i < sbi->s_partitions; i++) {
1270 map = &sbi->s_partmaps[i];
1271 udf_debug("Searching map: (%d == %d)\n",
1272 map->s_partition_num, partitionNumber);
1273 if (map->s_partition_num == partitionNumber &&
1274 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1275 map->s_partition_type == UDF_SPARABLE_MAP15))
1276 break;
1277 }
1278
1279 if (i >= sbi->s_partitions) {
1280 udf_debug("Partition (%d) not found in partition map\n",
1281 partitionNumber);
1282 ret = 0;
1283 goto out_bh;
1284 }
1285
1286 ret = udf_fill_partdesc_info(sb, p, i);
1287 if (ret < 0)
1288 goto out_bh;
1289
1290 /*
1291 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1292 * PHYSICAL partitions are already set up
1293 */
1294 type1_idx = i;
1295 #ifdef UDFFS_DEBUG
1296 map = NULL; /* supress 'maybe used uninitialized' warning */
1297 #endif
1298 for (i = 0; i < sbi->s_partitions; i++) {
1299 map = &sbi->s_partmaps[i];
1300
1301 if (map->s_partition_num == partitionNumber &&
1302 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1303 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1304 map->s_partition_type == UDF_METADATA_MAP25))
1305 break;
1306 }
1307
1308 if (i >= sbi->s_partitions) {
1309 ret = 0;
1310 goto out_bh;
1311 }
1312
1313 ret = udf_fill_partdesc_info(sb, p, i);
1314 if (ret < 0)
1315 goto out_bh;
1316
1317 if (map->s_partition_type == UDF_METADATA_MAP25) {
1318 ret = udf_load_metadata_files(sb, i);
1319 if (ret < 0) {
1320 udf_err(sb, "error loading MetaData partition map %d\n",
1321 i);
1322 goto out_bh;
1323 }
1324 } else {
1325 /*
1326 * If we have a partition with virtual map, we don't handle
1327 * writing to it (we overwrite blocks instead of relocating
1328 * them).
1329 */
1330 if (!(sb->s_flags & MS_RDONLY)) {
1331 ret = -EACCES;
1332 goto out_bh;
1333 }
1334 ret = udf_load_vat(sb, i, type1_idx);
1335 if (ret < 0)
1336 goto out_bh;
1337 }
1338 ret = 0;
1339 out_bh:
1340 /* In case loading failed, we handle cleanup in udf_fill_super */
1341 brelse(bh);
1342 return ret;
1343 }
1344
1345 static int udf_load_sparable_map(struct super_block *sb,
1346 struct udf_part_map *map,
1347 struct sparablePartitionMap *spm)
1348 {
1349 uint32_t loc;
1350 uint16_t ident;
1351 struct sparingTable *st;
1352 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1353 int i;
1354 struct buffer_head *bh;
1355
1356 map->s_partition_type = UDF_SPARABLE_MAP15;
1357 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1358 if (!is_power_of_2(sdata->s_packet_len)) {
1359 udf_err(sb, "error loading logical volume descriptor: "
1360 "Invalid packet length %u\n",
1361 (unsigned)sdata->s_packet_len);
1362 return -EIO;
1363 }
1364 if (spm->numSparingTables > 4) {
1365 udf_err(sb, "error loading logical volume descriptor: "
1366 "Too many sparing tables (%d)\n",
1367 (int)spm->numSparingTables);
1368 return -EIO;
1369 }
1370
1371 for (i = 0; i < spm->numSparingTables; i++) {
1372 loc = le32_to_cpu(spm->locSparingTable[i]);
1373 bh = udf_read_tagged(sb, loc, loc, &ident);
1374 if (!bh)
1375 continue;
1376
1377 st = (struct sparingTable *)bh->b_data;
1378 if (ident != 0 ||
1379 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1380 strlen(UDF_ID_SPARING)) ||
1381 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1382 sb->s_blocksize) {
1383 brelse(bh);
1384 continue;
1385 }
1386
1387 sdata->s_spar_map[i] = bh;
1388 }
1389 map->s_partition_func = udf_get_pblock_spar15;
1390 return 0;
1391 }
1392
1393 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1394 struct kernel_lb_addr *fileset)
1395 {
1396 struct logicalVolDesc *lvd;
1397 int i, offset;
1398 uint8_t type;
1399 struct udf_sb_info *sbi = UDF_SB(sb);
1400 struct genericPartitionMap *gpm;
1401 uint16_t ident;
1402 struct buffer_head *bh;
1403 unsigned int table_len;
1404 int ret;
1405
1406 bh = udf_read_tagged(sb, block, block, &ident);
1407 if (!bh)
1408 return -EAGAIN;
1409 BUG_ON(ident != TAG_IDENT_LVD);
1410 lvd = (struct logicalVolDesc *)bh->b_data;
1411 table_len = le32_to_cpu(lvd->mapTableLength);
1412 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1413 udf_err(sb, "error loading logical volume descriptor: "
1414 "Partition table too long (%u > %lu)\n", table_len,
1415 sb->s_blocksize - sizeof(*lvd));
1416 ret = -EIO;
1417 goto out_bh;
1418 }
1419
1420 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1421 if (ret)
1422 goto out_bh;
1423
1424 for (i = 0, offset = 0;
1425 i < sbi->s_partitions && offset < table_len;
1426 i++, offset += gpm->partitionMapLength) {
1427 struct udf_part_map *map = &sbi->s_partmaps[i];
1428 gpm = (struct genericPartitionMap *)
1429 &(lvd->partitionMaps[offset]);
1430 type = gpm->partitionMapType;
1431 if (type == 1) {
1432 struct genericPartitionMap1 *gpm1 =
1433 (struct genericPartitionMap1 *)gpm;
1434 map->s_partition_type = UDF_TYPE1_MAP15;
1435 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1436 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1437 map->s_partition_func = NULL;
1438 } else if (type == 2) {
1439 struct udfPartitionMap2 *upm2 =
1440 (struct udfPartitionMap2 *)gpm;
1441 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1442 strlen(UDF_ID_VIRTUAL))) {
1443 u16 suf =
1444 le16_to_cpu(((__le16 *)upm2->partIdent.
1445 identSuffix)[0]);
1446 if (suf < 0x0200) {
1447 map->s_partition_type =
1448 UDF_VIRTUAL_MAP15;
1449 map->s_partition_func =
1450 udf_get_pblock_virt15;
1451 } else {
1452 map->s_partition_type =
1453 UDF_VIRTUAL_MAP20;
1454 map->s_partition_func =
1455 udf_get_pblock_virt20;
1456 }
1457 } else if (!strncmp(upm2->partIdent.ident,
1458 UDF_ID_SPARABLE,
1459 strlen(UDF_ID_SPARABLE))) {
1460 ret = udf_load_sparable_map(sb, map,
1461 (struct sparablePartitionMap *)gpm);
1462 if (ret < 0)
1463 goto out_bh;
1464 } else if (!strncmp(upm2->partIdent.ident,
1465 UDF_ID_METADATA,
1466 strlen(UDF_ID_METADATA))) {
1467 struct udf_meta_data *mdata =
1468 &map->s_type_specific.s_metadata;
1469 struct metadataPartitionMap *mdm =
1470 (struct metadataPartitionMap *)
1471 &(lvd->partitionMaps[offset]);
1472 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1473 i, type, UDF_ID_METADATA);
1474
1475 map->s_partition_type = UDF_METADATA_MAP25;
1476 map->s_partition_func = udf_get_pblock_meta25;
1477
1478 mdata->s_meta_file_loc =
1479 le32_to_cpu(mdm->metadataFileLoc);
1480 mdata->s_mirror_file_loc =
1481 le32_to_cpu(mdm->metadataMirrorFileLoc);
1482 mdata->s_bitmap_file_loc =
1483 le32_to_cpu(mdm->metadataBitmapFileLoc);
1484 mdata->s_alloc_unit_size =
1485 le32_to_cpu(mdm->allocUnitSize);
1486 mdata->s_align_unit_size =
1487 le16_to_cpu(mdm->alignUnitSize);
1488 if (mdm->flags & 0x01)
1489 mdata->s_flags |= MF_DUPLICATE_MD;
1490
1491 udf_debug("Metadata Ident suffix=0x%x\n",
1492 le16_to_cpu(*(__le16 *)
1493 mdm->partIdent.identSuffix));
1494 udf_debug("Metadata part num=%d\n",
1495 le16_to_cpu(mdm->partitionNum));
1496 udf_debug("Metadata part alloc unit size=%d\n",
1497 le32_to_cpu(mdm->allocUnitSize));
1498 udf_debug("Metadata file loc=%d\n",
1499 le32_to_cpu(mdm->metadataFileLoc));
1500 udf_debug("Mirror file loc=%d\n",
1501 le32_to_cpu(mdm->metadataMirrorFileLoc));
1502 udf_debug("Bitmap file loc=%d\n",
1503 le32_to_cpu(mdm->metadataBitmapFileLoc));
1504 udf_debug("Flags: %d %d\n",
1505 mdata->s_flags, mdm->flags);
1506 } else {
1507 udf_debug("Unknown ident: %s\n",
1508 upm2->partIdent.ident);
1509 continue;
1510 }
1511 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1512 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1513 }
1514 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1515 i, map->s_partition_num, type, map->s_volumeseqnum);
1516 }
1517
1518 if (fileset) {
1519 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1520
1521 *fileset = lelb_to_cpu(la->extLocation);
1522 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1523 fileset->logicalBlockNum,
1524 fileset->partitionReferenceNum);
1525 }
1526 if (lvd->integritySeqExt.extLength)
1527 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1528 ret = 0;
1529 out_bh:
1530 brelse(bh);
1531 return ret;
1532 }
1533
1534 /*
1535 * udf_load_logicalvolint
1536 *
1537 */
1538 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1539 {
1540 struct buffer_head *bh = NULL;
1541 uint16_t ident;
1542 struct udf_sb_info *sbi = UDF_SB(sb);
1543 struct logicalVolIntegrityDesc *lvid;
1544
1545 while (loc.extLength > 0 &&
1546 (bh = udf_read_tagged(sb, loc.extLocation,
1547 loc.extLocation, &ident)) &&
1548 ident == TAG_IDENT_LVID) {
1549 sbi->s_lvid_bh = bh;
1550 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1551
1552 if (lvid->nextIntegrityExt.extLength)
1553 udf_load_logicalvolint(sb,
1554 leea_to_cpu(lvid->nextIntegrityExt));
1555
1556 if (sbi->s_lvid_bh != bh)
1557 brelse(bh);
1558 loc.extLength -= sb->s_blocksize;
1559 loc.extLocation++;
1560 }
1561 if (sbi->s_lvid_bh != bh)
1562 brelse(bh);
1563 }
1564
1565 /*
1566 * Process a main/reserve volume descriptor sequence.
1567 * @block First block of first extent of the sequence.
1568 * @lastblock Lastblock of first extent of the sequence.
1569 * @fileset There we store extent containing root fileset
1570 *
1571 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1572 * sequence
1573 */
1574 static noinline int udf_process_sequence(
1575 struct super_block *sb,
1576 sector_t block, sector_t lastblock,
1577 struct kernel_lb_addr *fileset)
1578 {
1579 struct buffer_head *bh = NULL;
1580 struct udf_vds_record vds[VDS_POS_LENGTH];
1581 struct udf_vds_record *curr;
1582 struct generic_desc *gd;
1583 struct volDescPtr *vdp;
1584 int done = 0;
1585 uint32_t vdsn;
1586 uint16_t ident;
1587 long next_s = 0, next_e = 0;
1588 int ret;
1589
1590 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1591
1592 /*
1593 * Read the main descriptor sequence and find which descriptors
1594 * are in it.
1595 */
1596 for (; (!done && block <= lastblock); block++) {
1597
1598 bh = udf_read_tagged(sb, block, block, &ident);
1599 if (!bh) {
1600 udf_err(sb,
1601 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1602 (unsigned long long)block);
1603 return -EAGAIN;
1604 }
1605
1606 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1607 gd = (struct generic_desc *)bh->b_data;
1608 vdsn = le32_to_cpu(gd->volDescSeqNum);
1609 switch (ident) {
1610 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1611 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1612 if (vdsn >= curr->volDescSeqNum) {
1613 curr->volDescSeqNum = vdsn;
1614 curr->block = block;
1615 }
1616 break;
1617 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1618 curr = &vds[VDS_POS_VOL_DESC_PTR];
1619 if (vdsn >= curr->volDescSeqNum) {
1620 curr->volDescSeqNum = vdsn;
1621 curr->block = block;
1622
1623 vdp = (struct volDescPtr *)bh->b_data;
1624 next_s = le32_to_cpu(
1625 vdp->nextVolDescSeqExt.extLocation);
1626 next_e = le32_to_cpu(
1627 vdp->nextVolDescSeqExt.extLength);
1628 next_e = next_e >> sb->s_blocksize_bits;
1629 next_e += next_s;
1630 }
1631 break;
1632 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1633 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1634 if (vdsn >= curr->volDescSeqNum) {
1635 curr->volDescSeqNum = vdsn;
1636 curr->block = block;
1637 }
1638 break;
1639 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1640 curr = &vds[VDS_POS_PARTITION_DESC];
1641 if (!curr->block)
1642 curr->block = block;
1643 break;
1644 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1645 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1646 if (vdsn >= curr->volDescSeqNum) {
1647 curr->volDescSeqNum = vdsn;
1648 curr->block = block;
1649 }
1650 break;
1651 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1652 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1653 if (vdsn >= curr->volDescSeqNum) {
1654 curr->volDescSeqNum = vdsn;
1655 curr->block = block;
1656 }
1657 break;
1658 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1659 vds[VDS_POS_TERMINATING_DESC].block = block;
1660 if (next_e) {
1661 block = next_s;
1662 lastblock = next_e;
1663 next_s = next_e = 0;
1664 } else
1665 done = 1;
1666 break;
1667 }
1668 brelse(bh);
1669 }
1670 /*
1671 * Now read interesting descriptors again and process them
1672 * in a suitable order
1673 */
1674 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1675 udf_err(sb, "Primary Volume Descriptor not found!\n");
1676 return -EAGAIN;
1677 }
1678 ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1679 if (ret < 0)
1680 return ret;
1681
1682 if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1683 ret = udf_load_logicalvol(sb,
1684 vds[VDS_POS_LOGICAL_VOL_DESC].block,
1685 fileset);
1686 if (ret < 0)
1687 return ret;
1688 }
1689
1690 if (vds[VDS_POS_PARTITION_DESC].block) {
1691 /*
1692 * We rescan the whole descriptor sequence to find
1693 * partition descriptor blocks and process them.
1694 */
1695 for (block = vds[VDS_POS_PARTITION_DESC].block;
1696 block < vds[VDS_POS_TERMINATING_DESC].block;
1697 block++) {
1698 ret = udf_load_partdesc(sb, block);
1699 if (ret < 0)
1700 return ret;
1701 }
1702 }
1703
1704 return 0;
1705 }
1706
1707 /*
1708 * Load Volume Descriptor Sequence described by anchor in bh
1709 *
1710 * Returns <0 on error, 0 on success
1711 */
1712 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1713 struct kernel_lb_addr *fileset)
1714 {
1715 struct anchorVolDescPtr *anchor;
1716 sector_t main_s, main_e, reserve_s, reserve_e;
1717 int ret;
1718
1719 anchor = (struct anchorVolDescPtr *)bh->b_data;
1720
1721 /* Locate the main sequence */
1722 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1723 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1724 main_e = main_e >> sb->s_blocksize_bits;
1725 main_e += main_s;
1726
1727 /* Locate the reserve sequence */
1728 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1729 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1730 reserve_e = reserve_e >> sb->s_blocksize_bits;
1731 reserve_e += reserve_s;
1732
1733 /* Process the main & reserve sequences */
1734 /* responsible for finding the PartitionDesc(s) */
1735 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1736 if (ret != -EAGAIN)
1737 return ret;
1738 udf_sb_free_partitions(sb);
1739 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1740 if (ret < 0) {
1741 udf_sb_free_partitions(sb);
1742 /* No sequence was OK, return -EIO */
1743 if (ret == -EAGAIN)
1744 ret = -EIO;
1745 }
1746 return ret;
1747 }
1748
1749 /*
1750 * Check whether there is an anchor block in the given block and
1751 * load Volume Descriptor Sequence if so.
1752 *
1753 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1754 * block
1755 */
1756 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1757 struct kernel_lb_addr *fileset)
1758 {
1759 struct buffer_head *bh;
1760 uint16_t ident;
1761 int ret;
1762
1763 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1764 udf_fixed_to_variable(block) >=
1765 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1766 return -EAGAIN;
1767
1768 bh = udf_read_tagged(sb, block, block, &ident);
1769 if (!bh)
1770 return -EAGAIN;
1771 if (ident != TAG_IDENT_AVDP) {
1772 brelse(bh);
1773 return -EAGAIN;
1774 }
1775 ret = udf_load_sequence(sb, bh, fileset);
1776 brelse(bh);
1777 return ret;
1778 }
1779
1780 /*
1781 * Search for an anchor volume descriptor pointer.
1782 *
1783 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1784 * of anchors.
1785 */
1786 static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1787 struct kernel_lb_addr *fileset)
1788 {
1789 sector_t last[6];
1790 int i;
1791 struct udf_sb_info *sbi = UDF_SB(sb);
1792 int last_count = 0;
1793 int ret;
1794
1795 /* First try user provided anchor */
1796 if (sbi->s_anchor) {
1797 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1798 if (ret != -EAGAIN)
1799 return ret;
1800 }
1801 /*
1802 * according to spec, anchor is in either:
1803 * block 256
1804 * lastblock-256
1805 * lastblock
1806 * however, if the disc isn't closed, it could be 512.
1807 */
1808 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1809 if (ret != -EAGAIN)
1810 return ret;
1811 /*
1812 * The trouble is which block is the last one. Drives often misreport
1813 * this so we try various possibilities.
1814 */
1815 last[last_count++] = *lastblock;
1816 if (*lastblock >= 1)
1817 last[last_count++] = *lastblock - 1;
1818 last[last_count++] = *lastblock + 1;
1819 if (*lastblock >= 2)
1820 last[last_count++] = *lastblock - 2;
1821 if (*lastblock >= 150)
1822 last[last_count++] = *lastblock - 150;
1823 if (*lastblock >= 152)
1824 last[last_count++] = *lastblock - 152;
1825
1826 for (i = 0; i < last_count; i++) {
1827 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1828 sb->s_blocksize_bits)
1829 continue;
1830 ret = udf_check_anchor_block(sb, last[i], fileset);
1831 if (ret != -EAGAIN) {
1832 if (!ret)
1833 *lastblock = last[i];
1834 return ret;
1835 }
1836 if (last[i] < 256)
1837 continue;
1838 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1839 if (ret != -EAGAIN) {
1840 if (!ret)
1841 *lastblock = last[i];
1842 return ret;
1843 }
1844 }
1845
1846 /* Finally try block 512 in case media is open */
1847 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1848 }
1849
1850 /*
1851 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1852 * area specified by it. The function expects sbi->s_lastblock to be the last
1853 * block on the media.
1854 *
1855 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1856 * was not found.
1857 */
1858 static int udf_find_anchor(struct super_block *sb,
1859 struct kernel_lb_addr *fileset)
1860 {
1861 struct udf_sb_info *sbi = UDF_SB(sb);
1862 sector_t lastblock = sbi->s_last_block;
1863 int ret;
1864
1865 ret = udf_scan_anchors(sb, &lastblock, fileset);
1866 if (ret != -EAGAIN)
1867 goto out;
1868
1869 /* No anchor found? Try VARCONV conversion of block numbers */
1870 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1871 lastblock = udf_variable_to_fixed(sbi->s_last_block);
1872 /* Firstly, we try to not convert number of the last block */
1873 ret = udf_scan_anchors(sb, &lastblock, fileset);
1874 if (ret != -EAGAIN)
1875 goto out;
1876
1877 lastblock = sbi->s_last_block;
1878 /* Secondly, we try with converted number of the last block */
1879 ret = udf_scan_anchors(sb, &lastblock, fileset);
1880 if (ret < 0) {
1881 /* VARCONV didn't help. Clear it. */
1882 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1883 }
1884 out:
1885 if (ret == 0)
1886 sbi->s_last_block = lastblock;
1887 return ret;
1888 }
1889
1890 /*
1891 * Check Volume Structure Descriptor, find Anchor block and load Volume
1892 * Descriptor Sequence.
1893 *
1894 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1895 * block was not found.
1896 */
1897 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1898 int silent, struct kernel_lb_addr *fileset)
1899 {
1900 struct udf_sb_info *sbi = UDF_SB(sb);
1901 loff_t nsr_off;
1902 int ret;
1903
1904 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1905 if (!silent)
1906 udf_warn(sb, "Bad block size\n");
1907 return -EINVAL;
1908 }
1909 sbi->s_last_block = uopt->lastblock;
1910 if (!uopt->novrs) {
1911 /* Check that it is NSR02 compliant */
1912 nsr_off = udf_check_vsd(sb);
1913 if (!nsr_off) {
1914 if (!silent)
1915 udf_warn(sb, "No VRS found\n");
1916 return 0;
1917 }
1918 if (nsr_off == -1)
1919 udf_debug("Failed to read sector at offset %d. "
1920 "Assuming open disc. Skipping validity "
1921 "check\n", VSD_FIRST_SECTOR_OFFSET);
1922 if (!sbi->s_last_block)
1923 sbi->s_last_block = udf_get_last_block(sb);
1924 } else {
1925 udf_debug("Validity check skipped because of novrs option\n");
1926 }
1927
1928 /* Look for anchor block and load Volume Descriptor Sequence */
1929 sbi->s_anchor = uopt->anchor;
1930 ret = udf_find_anchor(sb, fileset);
1931 if (ret < 0) {
1932 if (!silent && ret == -EAGAIN)
1933 udf_warn(sb, "No anchor found\n");
1934 return ret;
1935 }
1936 return 0;
1937 }
1938
1939 static void udf_open_lvid(struct super_block *sb)
1940 {
1941 struct udf_sb_info *sbi = UDF_SB(sb);
1942 struct buffer_head *bh = sbi->s_lvid_bh;
1943 struct logicalVolIntegrityDesc *lvid;
1944 struct logicalVolIntegrityDescImpUse *lvidiu;
1945
1946 if (!bh)
1947 return;
1948 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1949 lvidiu = udf_sb_lvidiu(sb);
1950 if (!lvidiu)
1951 return;
1952
1953 mutex_lock(&sbi->s_alloc_mutex);
1954 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1955 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1956 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1957 CURRENT_TIME);
1958 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1959
1960 lvid->descTag.descCRC = cpu_to_le16(
1961 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1962 le16_to_cpu(lvid->descTag.descCRCLength)));
1963
1964 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1965 mark_buffer_dirty(bh);
1966 sbi->s_lvid_dirty = 0;
1967 mutex_unlock(&sbi->s_alloc_mutex);
1968 /* Make opening of filesystem visible on the media immediately */
1969 sync_dirty_buffer(bh);
1970 }
1971
1972 static void udf_close_lvid(struct super_block *sb)
1973 {
1974 struct udf_sb_info *sbi = UDF_SB(sb);
1975 struct buffer_head *bh = sbi->s_lvid_bh;
1976 struct logicalVolIntegrityDesc *lvid;
1977 struct logicalVolIntegrityDescImpUse *lvidiu;
1978
1979 if (!bh)
1980 return;
1981 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1982 lvidiu = udf_sb_lvidiu(sb);
1983 if (!lvidiu)
1984 return;
1985
1986 mutex_lock(&sbi->s_alloc_mutex);
1987 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1988 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1989 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1990 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1991 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1992 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1993 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1994 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1995 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1996 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1997
1998 lvid->descTag.descCRC = cpu_to_le16(
1999 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2000 le16_to_cpu(lvid->descTag.descCRCLength)));
2001
2002 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2003 /*
2004 * We set buffer uptodate unconditionally here to avoid spurious
2005 * warnings from mark_buffer_dirty() when previous EIO has marked
2006 * the buffer as !uptodate
2007 */
2008 set_buffer_uptodate(bh);
2009 mark_buffer_dirty(bh);
2010 sbi->s_lvid_dirty = 0;
2011 mutex_unlock(&sbi->s_alloc_mutex);
2012 /* Make closing of filesystem visible on the media immediately */
2013 sync_dirty_buffer(bh);
2014 }
2015
2016 u64 lvid_get_unique_id(struct super_block *sb)
2017 {
2018 struct buffer_head *bh;
2019 struct udf_sb_info *sbi = UDF_SB(sb);
2020 struct logicalVolIntegrityDesc *lvid;
2021 struct logicalVolHeaderDesc *lvhd;
2022 u64 uniqueID;
2023 u64 ret;
2024
2025 bh = sbi->s_lvid_bh;
2026 if (!bh)
2027 return 0;
2028
2029 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2030 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2031
2032 mutex_lock(&sbi->s_alloc_mutex);
2033 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2034 if (!(++uniqueID & 0xFFFFFFFF))
2035 uniqueID += 16;
2036 lvhd->uniqueID = cpu_to_le64(uniqueID);
2037 mutex_unlock(&sbi->s_alloc_mutex);
2038 mark_buffer_dirty(bh);
2039
2040 return ret;
2041 }
2042
2043 static int udf_fill_super(struct super_block *sb, void *options, int silent)
2044 {
2045 int ret = -EINVAL;
2046 struct inode *inode = NULL;
2047 struct udf_options uopt;
2048 struct kernel_lb_addr rootdir, fileset;
2049 struct udf_sb_info *sbi;
2050
2051 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2052 uopt.uid = INVALID_UID;
2053 uopt.gid = INVALID_GID;
2054 uopt.umask = 0;
2055 uopt.fmode = UDF_INVALID_MODE;
2056 uopt.dmode = UDF_INVALID_MODE;
2057
2058 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2059 if (!sbi)
2060 return -ENOMEM;
2061
2062 sb->s_fs_info = sbi;
2063
2064 mutex_init(&sbi->s_alloc_mutex);
2065
2066 if (!udf_parse_options((char *)options, &uopt, false))
2067 goto error_out;
2068
2069 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2070 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2071 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2072 goto error_out;
2073 }
2074 #ifdef CONFIG_UDF_NLS
2075 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2076 uopt.nls_map = load_nls_default();
2077 if (!uopt.nls_map)
2078 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2079 else
2080 udf_debug("Using default NLS map\n");
2081 }
2082 #endif
2083 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2084 uopt.flags |= (1 << UDF_FLAG_UTF8);
2085
2086 fileset.logicalBlockNum = 0xFFFFFFFF;
2087 fileset.partitionReferenceNum = 0xFFFF;
2088
2089 sbi->s_flags = uopt.flags;
2090 sbi->s_uid = uopt.uid;
2091 sbi->s_gid = uopt.gid;
2092 sbi->s_umask = uopt.umask;
2093 sbi->s_fmode = uopt.fmode;
2094 sbi->s_dmode = uopt.dmode;
2095 sbi->s_nls_map = uopt.nls_map;
2096 rwlock_init(&sbi->s_cred_lock);
2097
2098 if (uopt.session == 0xFFFFFFFF)
2099 sbi->s_session = udf_get_last_session(sb);
2100 else
2101 sbi->s_session = uopt.session;
2102
2103 udf_debug("Multi-session=%d\n", sbi->s_session);
2104
2105 /* Fill in the rest of the superblock */
2106 sb->s_op = &udf_sb_ops;
2107 sb->s_export_op = &udf_export_ops;
2108
2109 sb->s_magic = UDF_SUPER_MAGIC;
2110 sb->s_time_gran = 1000;
2111
2112 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2113 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2114 } else {
2115 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2116 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2117 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2118 if (!silent)
2119 pr_notice("Rescanning with blocksize %d\n",
2120 UDF_DEFAULT_BLOCKSIZE);
2121 brelse(sbi->s_lvid_bh);
2122 sbi->s_lvid_bh = NULL;
2123 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2124 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2125 }
2126 }
2127 if (ret < 0) {
2128 if (ret == -EAGAIN) {
2129 udf_warn(sb, "No partition found (1)\n");
2130 ret = -EINVAL;
2131 }
2132 goto error_out;
2133 }
2134
2135 udf_debug("Lastblock=%d\n", sbi->s_last_block);
2136
2137 if (sbi->s_lvid_bh) {
2138 struct logicalVolIntegrityDescImpUse *lvidiu =
2139 udf_sb_lvidiu(sb);
2140 uint16_t minUDFReadRev;
2141 uint16_t minUDFWriteRev;
2142
2143 if (!lvidiu) {
2144 ret = -EINVAL;
2145 goto error_out;
2146 }
2147 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2148 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2149 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2150 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2151 minUDFReadRev,
2152 UDF_MAX_READ_VERSION);
2153 ret = -EINVAL;
2154 goto error_out;
2155 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2156 !(sb->s_flags & MS_RDONLY)) {
2157 ret = -EACCES;
2158 goto error_out;
2159 }
2160
2161 sbi->s_udfrev = minUDFWriteRev;
2162
2163 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2164 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2165 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2166 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2167 }
2168
2169 if (!sbi->s_partitions) {
2170 udf_warn(sb, "No partition found (2)\n");
2171 ret = -EINVAL;
2172 goto error_out;
2173 }
2174
2175 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2176 UDF_PART_FLAG_READ_ONLY &&
2177 !(sb->s_flags & MS_RDONLY)) {
2178 ret = -EACCES;
2179 goto error_out;
2180 }
2181
2182 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2183 udf_warn(sb, "No fileset found\n");
2184 ret = -EINVAL;
2185 goto error_out;
2186 }
2187
2188 if (!silent) {
2189 struct timestamp ts;
2190 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2191 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2192 sbi->s_volume_ident,
2193 le16_to_cpu(ts.year), ts.month, ts.day,
2194 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2195 }
2196 if (!(sb->s_flags & MS_RDONLY))
2197 udf_open_lvid(sb);
2198
2199 /* Assign the root inode */
2200 /* assign inodes by physical block number */
2201 /* perhaps it's not extensible enough, but for now ... */
2202 inode = udf_iget(sb, &rootdir);
2203 if (!inode) {
2204 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2205 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2206 ret = -EIO;
2207 goto error_out;
2208 }
2209
2210 /* Allocate a dentry for the root inode */
2211 sb->s_root = d_make_root(inode);
2212 if (!sb->s_root) {
2213 udf_err(sb, "Couldn't allocate root dentry\n");
2214 ret = -ENOMEM;
2215 goto error_out;
2216 }
2217 sb->s_maxbytes = MAX_LFS_FILESIZE;
2218 sb->s_max_links = UDF_MAX_LINKS;
2219 return 0;
2220
2221 error_out:
2222 if (sbi->s_vat_inode)
2223 iput(sbi->s_vat_inode);
2224 #ifdef CONFIG_UDF_NLS
2225 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2226 unload_nls(sbi->s_nls_map);
2227 #endif
2228 if (!(sb->s_flags & MS_RDONLY))
2229 udf_close_lvid(sb);
2230 brelse(sbi->s_lvid_bh);
2231 udf_sb_free_partitions(sb);
2232 kfree(sbi);
2233 sb->s_fs_info = NULL;
2234
2235 return ret;
2236 }
2237
2238 void _udf_err(struct super_block *sb, const char *function,
2239 const char *fmt, ...)
2240 {
2241 struct va_format vaf;
2242 va_list args;
2243
2244 va_start(args, fmt);
2245
2246 vaf.fmt = fmt;
2247 vaf.va = &args;
2248
2249 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2250
2251 va_end(args);
2252 }
2253
2254 void _udf_warn(struct super_block *sb, const char *function,
2255 const char *fmt, ...)
2256 {
2257 struct va_format vaf;
2258 va_list args;
2259
2260 va_start(args, fmt);
2261
2262 vaf.fmt = fmt;
2263 vaf.va = &args;
2264
2265 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2266
2267 va_end(args);
2268 }
2269
2270 static void udf_put_super(struct super_block *sb)
2271 {
2272 struct udf_sb_info *sbi;
2273
2274 sbi = UDF_SB(sb);
2275
2276 if (sbi->s_vat_inode)
2277 iput(sbi->s_vat_inode);
2278 #ifdef CONFIG_UDF_NLS
2279 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2280 unload_nls(sbi->s_nls_map);
2281 #endif
2282 if (!(sb->s_flags & MS_RDONLY))
2283 udf_close_lvid(sb);
2284 brelse(sbi->s_lvid_bh);
2285 udf_sb_free_partitions(sb);
2286 kfree(sb->s_fs_info);
2287 sb->s_fs_info = NULL;
2288 }
2289
2290 static int udf_sync_fs(struct super_block *sb, int wait)
2291 {
2292 struct udf_sb_info *sbi = UDF_SB(sb);
2293
2294 mutex_lock(&sbi->s_alloc_mutex);
2295 if (sbi->s_lvid_dirty) {
2296 /*
2297 * Blockdevice will be synced later so we don't have to submit
2298 * the buffer for IO
2299 */
2300 mark_buffer_dirty(sbi->s_lvid_bh);
2301 sbi->s_lvid_dirty = 0;
2302 }
2303 mutex_unlock(&sbi->s_alloc_mutex);
2304
2305 return 0;
2306 }
2307
2308 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2309 {
2310 struct super_block *sb = dentry->d_sb;
2311 struct udf_sb_info *sbi = UDF_SB(sb);
2312 struct logicalVolIntegrityDescImpUse *lvidiu;
2313 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2314
2315 lvidiu = udf_sb_lvidiu(sb);
2316 buf->f_type = UDF_SUPER_MAGIC;
2317 buf->f_bsize = sb->s_blocksize;
2318 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2319 buf->f_bfree = udf_count_free(sb);
2320 buf->f_bavail = buf->f_bfree;
2321 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2322 le32_to_cpu(lvidiu->numDirs)) : 0)
2323 + buf->f_bfree;
2324 buf->f_ffree = buf->f_bfree;
2325 buf->f_namelen = UDF_NAME_LEN - 2;
2326 buf->f_fsid.val[0] = (u32)id;
2327 buf->f_fsid.val[1] = (u32)(id >> 32);
2328
2329 return 0;
2330 }
2331
2332 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2333 struct udf_bitmap *bitmap)
2334 {
2335 struct buffer_head *bh = NULL;
2336 unsigned int accum = 0;
2337 int index;
2338 int block = 0, newblock;
2339 struct kernel_lb_addr loc;
2340 uint32_t bytes;
2341 uint8_t *ptr;
2342 uint16_t ident;
2343 struct spaceBitmapDesc *bm;
2344
2345 loc.logicalBlockNum = bitmap->s_extPosition;
2346 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2347 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2348
2349 if (!bh) {
2350 udf_err(sb, "udf_count_free failed\n");
2351 goto out;
2352 } else if (ident != TAG_IDENT_SBD) {
2353 brelse(bh);
2354 udf_err(sb, "udf_count_free failed\n");
2355 goto out;
2356 }
2357
2358 bm = (struct spaceBitmapDesc *)bh->b_data;
2359 bytes = le32_to_cpu(bm->numOfBytes);
2360 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2361 ptr = (uint8_t *)bh->b_data;
2362
2363 while (bytes > 0) {
2364 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2365 accum += bitmap_weight((const unsigned long *)(ptr + index),
2366 cur_bytes * 8);
2367 bytes -= cur_bytes;
2368 if (bytes) {
2369 brelse(bh);
2370 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2371 bh = udf_tread(sb, newblock);
2372 if (!bh) {
2373 udf_debug("read failed\n");
2374 goto out;
2375 }
2376 index = 0;
2377 ptr = (uint8_t *)bh->b_data;
2378 }
2379 }
2380 brelse(bh);
2381 out:
2382 return accum;
2383 }
2384
2385 static unsigned int udf_count_free_table(struct super_block *sb,
2386 struct inode *table)
2387 {
2388 unsigned int accum = 0;
2389 uint32_t elen;
2390 struct kernel_lb_addr eloc;
2391 int8_t etype;
2392 struct extent_position epos;
2393
2394 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2395 epos.block = UDF_I(table)->i_location;
2396 epos.offset = sizeof(struct unallocSpaceEntry);
2397 epos.bh = NULL;
2398
2399 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2400 accum += (elen >> table->i_sb->s_blocksize_bits);
2401
2402 brelse(epos.bh);
2403 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2404
2405 return accum;
2406 }
2407
2408 static unsigned int udf_count_free(struct super_block *sb)
2409 {
2410 unsigned int accum = 0;
2411 struct udf_sb_info *sbi;
2412 struct udf_part_map *map;
2413
2414 sbi = UDF_SB(sb);
2415 if (sbi->s_lvid_bh) {
2416 struct logicalVolIntegrityDesc *lvid =
2417 (struct logicalVolIntegrityDesc *)
2418 sbi->s_lvid_bh->b_data;
2419 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2420 accum = le32_to_cpu(
2421 lvid->freeSpaceTable[sbi->s_partition]);
2422 if (accum == 0xFFFFFFFF)
2423 accum = 0;
2424 }
2425 }
2426
2427 if (accum)
2428 return accum;
2429
2430 map = &sbi->s_partmaps[sbi->s_partition];
2431 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2432 accum += udf_count_free_bitmap(sb,
2433 map->s_uspace.s_bitmap);
2434 }
2435 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2436 accum += udf_count_free_bitmap(sb,
2437 map->s_fspace.s_bitmap);
2438 }
2439 if (accum)
2440 return accum;
2441
2442 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2443 accum += udf_count_free_table(sb,
2444 map->s_uspace.s_table);
2445 }
2446 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2447 accum += udf_count_free_table(sb,
2448 map->s_fspace.s_table);
2449 }
2450
2451 return accum;
2452 }
Linux with added FPC-III support