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MIPS: Lantiq: Adds minimal dcdc driver
[linux-2.6.git] / fs / udf / super.c
blob9ac4057a86c90f64a84ea2cee0b92e4f549ac01a
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 uopt.flags = sbi->s_flags;
634 uopt.uid = sbi->s_uid;
635 uopt.gid = sbi->s_gid;
636 uopt.umask = sbi->s_umask;
637 uopt.fmode = sbi->s_fmode;
638 uopt.dmode = sbi->s_dmode;
639
640 if (!udf_parse_options(options, &uopt, true))
641 return -EINVAL;
642
643 write_lock(&sbi->s_cred_lock);
644 sbi->s_flags = uopt.flags;
645 sbi->s_uid = uopt.uid;
646 sbi->s_gid = uopt.gid;
647 sbi->s_umask = uopt.umask;
648 sbi->s_fmode = uopt.fmode;
649 sbi->s_dmode = uopt.dmode;
650 write_unlock(&sbi->s_cred_lock);
651
652 if (sbi->s_lvid_bh) {
653 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
654 if (write_rev > UDF_MAX_WRITE_VERSION)
655 *flags |= MS_RDONLY;
656 }
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 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
847 {
848 struct primaryVolDesc *pvoldesc;
849 struct ustr *instr, *outstr;
850 struct buffer_head *bh;
851 uint16_t ident;
852 int ret = 1;
853
854 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
855 if (!instr)
856 return 1;
857
858 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
859 if (!outstr)
860 goto out1;
861
862 bh = udf_read_tagged(sb, block, block, &ident);
863 if (!bh)
864 goto out2;
865
866 BUG_ON(ident != TAG_IDENT_PVD);
867
868 pvoldesc = (struct primaryVolDesc *)bh->b_data;
869
870 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
871 pvoldesc->recordingDateAndTime)) {
872 #ifdef UDFFS_DEBUG
873 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
874 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
875 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
876 ts->minute, le16_to_cpu(ts->typeAndTimezone));
877 #endif
878 }
879
880 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
881 if (udf_CS0toUTF8(outstr, instr)) {
882 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
883 outstr->u_len > 31 ? 31 : outstr->u_len);
884 udf_debug("volIdent[] = '%s'\n",
885 UDF_SB(sb)->s_volume_ident);
886 }
887
888 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
889 if (udf_CS0toUTF8(outstr, instr))
890 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
891
892 brelse(bh);
893 ret = 0;
894 out2:
895 kfree(outstr);
896 out1:
897 kfree(instr);
898 return ret;
899 }
900
901 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
902 u32 meta_file_loc, u32 partition_num)
903 {
904 struct kernel_lb_addr addr;
905 struct inode *metadata_fe;
906
907 addr.logicalBlockNum = meta_file_loc;
908 addr.partitionReferenceNum = partition_num;
909
910 metadata_fe = udf_iget(sb, &addr);
911
912 if (metadata_fe == NULL)
913 udf_warn(sb, "metadata inode efe not found\n");
914 else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
915 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
916 iput(metadata_fe);
917 metadata_fe = NULL;
918 }
919
920 return metadata_fe;
921 }
922
923 static int udf_load_metadata_files(struct super_block *sb, int partition)
924 {
925 struct udf_sb_info *sbi = UDF_SB(sb);
926 struct udf_part_map *map;
927 struct udf_meta_data *mdata;
928 struct kernel_lb_addr addr;
929
930 map = &sbi->s_partmaps[partition];
931 mdata = &map->s_type_specific.s_metadata;
932
933 /* metadata address */
934 udf_debug("Metadata file location: block = %d part = %d\n",
935 mdata->s_meta_file_loc, map->s_partition_num);
936
937 mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
938 mdata->s_meta_file_loc, map->s_partition_num);
939
940 if (mdata->s_metadata_fe == NULL) {
941 /* mirror file entry */
942 udf_debug("Mirror metadata file location: block = %d part = %d\n",
943 mdata->s_mirror_file_loc, map->s_partition_num);
944
945 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
946 mdata->s_mirror_file_loc, map->s_partition_num);
947
948 if (mdata->s_mirror_fe == NULL) {
949 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
950 goto error_exit;
951 }
952 }
953
954 /*
955 * bitmap file entry
956 * Note:
957 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
958 */
959 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
960 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
961 addr.partitionReferenceNum = map->s_partition_num;
962
963 udf_debug("Bitmap file location: block = %d part = %d\n",
964 addr.logicalBlockNum, addr.partitionReferenceNum);
965
966 mdata->s_bitmap_fe = udf_iget(sb, &addr);
967
968 if (mdata->s_bitmap_fe == NULL) {
969 if (sb->s_flags & MS_RDONLY)
970 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
971 else {
972 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
973 goto error_exit;
974 }
975 }
976 }
977
978 udf_debug("udf_load_metadata_files Ok\n");
979
980 return 0;
981
982 error_exit:
983 return 1;
984 }
985
986 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
987 struct kernel_lb_addr *root)
988 {
989 struct fileSetDesc *fset;
990
991 fset = (struct fileSetDesc *)bh->b_data;
992
993 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
994
995 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
996
997 udf_debug("Rootdir at block=%d, partition=%d\n",
998 root->logicalBlockNum, root->partitionReferenceNum);
999 }
1000
1001 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1002 {
1003 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1004 return DIV_ROUND_UP(map->s_partition_len +
1005 (sizeof(struct spaceBitmapDesc) << 3),
1006 sb->s_blocksize * 8);
1007 }
1008
1009 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1010 {
1011 struct udf_bitmap *bitmap;
1012 int nr_groups;
1013 int size;
1014
1015 nr_groups = udf_compute_nr_groups(sb, index);
1016 size = sizeof(struct udf_bitmap) +
1017 (sizeof(struct buffer_head *) * nr_groups);
1018
1019 if (size <= PAGE_SIZE)
1020 bitmap = kzalloc(size, GFP_KERNEL);
1021 else
1022 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1023
1024 if (bitmap == NULL)
1025 return NULL;
1026
1027 bitmap->s_nr_groups = nr_groups;
1028 return bitmap;
1029 }
1030
1031 static int udf_fill_partdesc_info(struct super_block *sb,
1032 struct partitionDesc *p, int p_index)
1033 {
1034 struct udf_part_map *map;
1035 struct udf_sb_info *sbi = UDF_SB(sb);
1036 struct partitionHeaderDesc *phd;
1037
1038 map = &sbi->s_partmaps[p_index];
1039
1040 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1041 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1042
1043 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1044 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1045 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1046 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1047 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1048 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1049 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1050 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1051
1052 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1053 p_index, map->s_partition_type,
1054 map->s_partition_root, map->s_partition_len);
1055
1056 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1057 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1058 return 0;
1059
1060 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1061 if (phd->unallocSpaceTable.extLength) {
1062 struct kernel_lb_addr loc = {
1063 .logicalBlockNum = le32_to_cpu(
1064 phd->unallocSpaceTable.extPosition),
1065 .partitionReferenceNum = p_index,
1066 };
1067
1068 map->s_uspace.s_table = udf_iget(sb, &loc);
1069 if (!map->s_uspace.s_table) {
1070 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1071 p_index);
1072 return 1;
1073 }
1074 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1075 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1076 p_index, map->s_uspace.s_table->i_ino);
1077 }
1078
1079 if (phd->unallocSpaceBitmap.extLength) {
1080 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1081 if (!bitmap)
1082 return 1;
1083 map->s_uspace.s_bitmap = bitmap;
1084 bitmap->s_extPosition = le32_to_cpu(
1085 phd->unallocSpaceBitmap.extPosition);
1086 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1087 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1088 p_index, bitmap->s_extPosition);
1089 }
1090
1091 if (phd->partitionIntegrityTable.extLength)
1092 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1093
1094 if (phd->freedSpaceTable.extLength) {
1095 struct kernel_lb_addr loc = {
1096 .logicalBlockNum = le32_to_cpu(
1097 phd->freedSpaceTable.extPosition),
1098 .partitionReferenceNum = p_index,
1099 };
1100
1101 map->s_fspace.s_table = udf_iget(sb, &loc);
1102 if (!map->s_fspace.s_table) {
1103 udf_debug("cannot load freedSpaceTable (part %d)\n",
1104 p_index);
1105 return 1;
1106 }
1107
1108 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1109 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1110 p_index, map->s_fspace.s_table->i_ino);
1111 }
1112
1113 if (phd->freedSpaceBitmap.extLength) {
1114 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1115 if (!bitmap)
1116 return 1;
1117 map->s_fspace.s_bitmap = bitmap;
1118 bitmap->s_extPosition = le32_to_cpu(
1119 phd->freedSpaceBitmap.extPosition);
1120 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1121 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1122 p_index, bitmap->s_extPosition);
1123 }
1124 return 0;
1125 }
1126
1127 static void udf_find_vat_block(struct super_block *sb, int p_index,
1128 int type1_index, sector_t start_block)
1129 {
1130 struct udf_sb_info *sbi = UDF_SB(sb);
1131 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1132 sector_t vat_block;
1133 struct kernel_lb_addr ino;
1134
1135 /*
1136 * VAT file entry is in the last recorded block. Some broken disks have
1137 * it a few blocks before so try a bit harder...
1138 */
1139 ino.partitionReferenceNum = type1_index;
1140 for (vat_block = start_block;
1141 vat_block >= map->s_partition_root &&
1142 vat_block >= start_block - 3 &&
1143 !sbi->s_vat_inode; vat_block--) {
1144 ino.logicalBlockNum = vat_block - map->s_partition_root;
1145 sbi->s_vat_inode = udf_iget(sb, &ino);
1146 }
1147 }
1148
1149 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1150 {
1151 struct udf_sb_info *sbi = UDF_SB(sb);
1152 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1153 struct buffer_head *bh = NULL;
1154 struct udf_inode_info *vati;
1155 uint32_t pos;
1156 struct virtualAllocationTable20 *vat20;
1157 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1158
1159 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1160 if (!sbi->s_vat_inode &&
1161 sbi->s_last_block != blocks - 1) {
1162 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1163 (unsigned long)sbi->s_last_block,
1164 (unsigned long)blocks - 1);
1165 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1166 }
1167 if (!sbi->s_vat_inode)
1168 return 1;
1169
1170 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1171 map->s_type_specific.s_virtual.s_start_offset = 0;
1172 map->s_type_specific.s_virtual.s_num_entries =
1173 (sbi->s_vat_inode->i_size - 36) >> 2;
1174 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1175 vati = UDF_I(sbi->s_vat_inode);
1176 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1177 pos = udf_block_map(sbi->s_vat_inode, 0);
1178 bh = sb_bread(sb, pos);
1179 if (!bh)
1180 return 1;
1181 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1182 } else {
1183 vat20 = (struct virtualAllocationTable20 *)
1184 vati->i_ext.i_data;
1185 }
1186
1187 map->s_type_specific.s_virtual.s_start_offset =
1188 le16_to_cpu(vat20->lengthHeader);
1189 map->s_type_specific.s_virtual.s_num_entries =
1190 (sbi->s_vat_inode->i_size -
1191 map->s_type_specific.s_virtual.
1192 s_start_offset) >> 2;
1193 brelse(bh);
1194 }
1195 return 0;
1196 }
1197
1198 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1199 {
1200 struct buffer_head *bh;
1201 struct partitionDesc *p;
1202 struct udf_part_map *map;
1203 struct udf_sb_info *sbi = UDF_SB(sb);
1204 int i, type1_idx;
1205 uint16_t partitionNumber;
1206 uint16_t ident;
1207 int ret = 0;
1208
1209 bh = udf_read_tagged(sb, block, block, &ident);
1210 if (!bh)
1211 return 1;
1212 if (ident != TAG_IDENT_PD)
1213 goto out_bh;
1214
1215 p = (struct partitionDesc *)bh->b_data;
1216 partitionNumber = le16_to_cpu(p->partitionNumber);
1217
1218 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1219 for (i = 0; i < sbi->s_partitions; i++) {
1220 map = &sbi->s_partmaps[i];
1221 udf_debug("Searching map: (%d == %d)\n",
1222 map->s_partition_num, partitionNumber);
1223 if (map->s_partition_num == partitionNumber &&
1224 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1225 map->s_partition_type == UDF_SPARABLE_MAP15))
1226 break;
1227 }
1228
1229 if (i >= sbi->s_partitions) {
1230 udf_debug("Partition (%d) not found in partition map\n",
1231 partitionNumber);
1232 goto out_bh;
1233 }
1234
1235 ret = udf_fill_partdesc_info(sb, p, i);
1236
1237 /*
1238 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1239 * PHYSICAL partitions are already set up
1240 */
1241 type1_idx = i;
1242 for (i = 0; i < sbi->s_partitions; i++) {
1243 map = &sbi->s_partmaps[i];
1244
1245 if (map->s_partition_num == partitionNumber &&
1246 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1247 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1248 map->s_partition_type == UDF_METADATA_MAP25))
1249 break;
1250 }
1251
1252 if (i >= sbi->s_partitions)
1253 goto out_bh;
1254
1255 ret = udf_fill_partdesc_info(sb, p, i);
1256 if (ret)
1257 goto out_bh;
1258
1259 if (map->s_partition_type == UDF_METADATA_MAP25) {
1260 ret = udf_load_metadata_files(sb, i);
1261 if (ret) {
1262 udf_err(sb, "error loading MetaData partition map %d\n",
1263 i);
1264 goto out_bh;
1265 }
1266 } else {
1267 ret = udf_load_vat(sb, i, type1_idx);
1268 if (ret)
1269 goto out_bh;
1270 /*
1271 * Mark filesystem read-only if we have a partition with
1272 * virtual map since we don't handle writing to it (we
1273 * overwrite blocks instead of relocating them).
1274 */
1275 sb->s_flags |= MS_RDONLY;
1276 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1277 }
1278 out_bh:
1279 /* In case loading failed, we handle cleanup in udf_fill_super */
1280 brelse(bh);
1281 return ret;
1282 }
1283
1284 static int udf_load_sparable_map(struct super_block *sb,
1285 struct udf_part_map *map,
1286 struct sparablePartitionMap *spm)
1287 {
1288 uint32_t loc;
1289 uint16_t ident;
1290 struct sparingTable *st;
1291 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1292 int i;
1293 struct buffer_head *bh;
1294
1295 map->s_partition_type = UDF_SPARABLE_MAP15;
1296 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1297 if (!is_power_of_2(sdata->s_packet_len)) {
1298 udf_err(sb, "error loading logical volume descriptor: "
1299 "Invalid packet length %u\n",
1300 (unsigned)sdata->s_packet_len);
1301 return -EIO;
1302 }
1303 if (spm->numSparingTables > 4) {
1304 udf_err(sb, "error loading logical volume descriptor: "
1305 "Too many sparing tables (%d)\n",
1306 (int)spm->numSparingTables);
1307 return -EIO;
1308 }
1309
1310 for (i = 0; i < spm->numSparingTables; i++) {
1311 loc = le32_to_cpu(spm->locSparingTable[i]);
1312 bh = udf_read_tagged(sb, loc, loc, &ident);
1313 if (!bh)
1314 continue;
1315
1316 st = (struct sparingTable *)bh->b_data;
1317 if (ident != 0 ||
1318 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1319 strlen(UDF_ID_SPARING)) ||
1320 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1321 sb->s_blocksize) {
1322 brelse(bh);
1323 continue;
1324 }
1325
1326 sdata->s_spar_map[i] = bh;
1327 }
1328 map->s_partition_func = udf_get_pblock_spar15;
1329 return 0;
1330 }
1331
1332 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1333 struct kernel_lb_addr *fileset)
1334 {
1335 struct logicalVolDesc *lvd;
1336 int i, offset;
1337 uint8_t type;
1338 struct udf_sb_info *sbi = UDF_SB(sb);
1339 struct genericPartitionMap *gpm;
1340 uint16_t ident;
1341 struct buffer_head *bh;
1342 unsigned int table_len;
1343 int ret = 0;
1344
1345 bh = udf_read_tagged(sb, block, block, &ident);
1346 if (!bh)
1347 return 1;
1348 BUG_ON(ident != TAG_IDENT_LVD);
1349 lvd = (struct logicalVolDesc *)bh->b_data;
1350 table_len = le32_to_cpu(lvd->mapTableLength);
1351 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1352 udf_err(sb, "error loading logical volume descriptor: "
1353 "Partition table too long (%u > %lu)\n", table_len,
1354 sb->s_blocksize - sizeof(*lvd));
1355 ret = 1;
1356 goto out_bh;
1357 }
1358
1359 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1360 if (ret)
1361 goto out_bh;
1362
1363 for (i = 0, offset = 0;
1364 i < sbi->s_partitions && offset < table_len;
1365 i++, offset += gpm->partitionMapLength) {
1366 struct udf_part_map *map = &sbi->s_partmaps[i];
1367 gpm = (struct genericPartitionMap *)
1368 &(lvd->partitionMaps[offset]);
1369 type = gpm->partitionMapType;
1370 if (type == 1) {
1371 struct genericPartitionMap1 *gpm1 =
1372 (struct genericPartitionMap1 *)gpm;
1373 map->s_partition_type = UDF_TYPE1_MAP15;
1374 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1375 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1376 map->s_partition_func = NULL;
1377 } else if (type == 2) {
1378 struct udfPartitionMap2 *upm2 =
1379 (struct udfPartitionMap2 *)gpm;
1380 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1381 strlen(UDF_ID_VIRTUAL))) {
1382 u16 suf =
1383 le16_to_cpu(((__le16 *)upm2->partIdent.
1384 identSuffix)[0]);
1385 if (suf < 0x0200) {
1386 map->s_partition_type =
1387 UDF_VIRTUAL_MAP15;
1388 map->s_partition_func =
1389 udf_get_pblock_virt15;
1390 } else {
1391 map->s_partition_type =
1392 UDF_VIRTUAL_MAP20;
1393 map->s_partition_func =
1394 udf_get_pblock_virt20;
1395 }
1396 } else if (!strncmp(upm2->partIdent.ident,
1397 UDF_ID_SPARABLE,
1398 strlen(UDF_ID_SPARABLE))) {
1399 if (udf_load_sparable_map(sb, map,
1400 (struct sparablePartitionMap *)gpm) < 0) {
1401 ret = 1;
1402 goto out_bh;
1403 }
1404 } else if (!strncmp(upm2->partIdent.ident,
1405 UDF_ID_METADATA,
1406 strlen(UDF_ID_METADATA))) {
1407 struct udf_meta_data *mdata =
1408 &map->s_type_specific.s_metadata;
1409 struct metadataPartitionMap *mdm =
1410 (struct metadataPartitionMap *)
1411 &(lvd->partitionMaps[offset]);
1412 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1413 i, type, UDF_ID_METADATA);
1414
1415 map->s_partition_type = UDF_METADATA_MAP25;
1416 map->s_partition_func = udf_get_pblock_meta25;
1417
1418 mdata->s_meta_file_loc =
1419 le32_to_cpu(mdm->metadataFileLoc);
1420 mdata->s_mirror_file_loc =
1421 le32_to_cpu(mdm->metadataMirrorFileLoc);
1422 mdata->s_bitmap_file_loc =
1423 le32_to_cpu(mdm->metadataBitmapFileLoc);
1424 mdata->s_alloc_unit_size =
1425 le32_to_cpu(mdm->allocUnitSize);
1426 mdata->s_align_unit_size =
1427 le16_to_cpu(mdm->alignUnitSize);
1428 if (mdm->flags & 0x01)
1429 mdata->s_flags |= MF_DUPLICATE_MD;
1430
1431 udf_debug("Metadata Ident suffix=0x%x\n",
1432 le16_to_cpu(*(__le16 *)
1433 mdm->partIdent.identSuffix));
1434 udf_debug("Metadata part num=%d\n",
1435 le16_to_cpu(mdm->partitionNum));
1436 udf_debug("Metadata part alloc unit size=%d\n",
1437 le32_to_cpu(mdm->allocUnitSize));
1438 udf_debug("Metadata file loc=%d\n",
1439 le32_to_cpu(mdm->metadataFileLoc));
1440 udf_debug("Mirror file loc=%d\n",
1441 le32_to_cpu(mdm->metadataMirrorFileLoc));
1442 udf_debug("Bitmap file loc=%d\n",
1443 le32_to_cpu(mdm->metadataBitmapFileLoc));
1444 udf_debug("Flags: %d %d\n",
1445 mdata->s_flags, mdm->flags);
1446 } else {
1447 udf_debug("Unknown ident: %s\n",
1448 upm2->partIdent.ident);
1449 continue;
1450 }
1451 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1452 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1453 }
1454 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1455 i, map->s_partition_num, type, map->s_volumeseqnum);
1456 }
1457
1458 if (fileset) {
1459 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1460
1461 *fileset = lelb_to_cpu(la->extLocation);
1462 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1463 fileset->logicalBlockNum,
1464 fileset->partitionReferenceNum);
1465 }
1466 if (lvd->integritySeqExt.extLength)
1467 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1468
1469 out_bh:
1470 brelse(bh);
1471 return ret;
1472 }
1473
1474 /*
1475 * udf_load_logicalvolint
1476 *
1477 */
1478 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1479 {
1480 struct buffer_head *bh = NULL;
1481 uint16_t ident;
1482 struct udf_sb_info *sbi = UDF_SB(sb);
1483 struct logicalVolIntegrityDesc *lvid;
1484
1485 while (loc.extLength > 0 &&
1486 (bh = udf_read_tagged(sb, loc.extLocation,
1487 loc.extLocation, &ident)) &&
1488 ident == TAG_IDENT_LVID) {
1489 sbi->s_lvid_bh = bh;
1490 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1491
1492 if (lvid->nextIntegrityExt.extLength)
1493 udf_load_logicalvolint(sb,
1494 leea_to_cpu(lvid->nextIntegrityExt));
1495
1496 if (sbi->s_lvid_bh != bh)
1497 brelse(bh);
1498 loc.extLength -= sb->s_blocksize;
1499 loc.extLocation++;
1500 }
1501 if (sbi->s_lvid_bh != bh)
1502 brelse(bh);
1503 }
1504
1505 /*
1506 * udf_process_sequence
1507 *
1508 * PURPOSE
1509 * Process a main/reserve volume descriptor sequence.
1510 *
1511 * PRE-CONDITIONS
1512 * sb Pointer to _locked_ superblock.
1513 * block First block of first extent of the sequence.
1514 * lastblock Lastblock of first extent of the sequence.
1515 *
1516 * HISTORY
1517 * July 1, 1997 - Andrew E. Mileski
1518 * Written, tested, and released.
1519 */
1520 static noinline int udf_process_sequence(struct super_block *sb, long block,
1521 long lastblock, struct kernel_lb_addr *fileset)
1522 {
1523 struct buffer_head *bh = NULL;
1524 struct udf_vds_record vds[VDS_POS_LENGTH];
1525 struct udf_vds_record *curr;
1526 struct generic_desc *gd;
1527 struct volDescPtr *vdp;
1528 int done = 0;
1529 uint32_t vdsn;
1530 uint16_t ident;
1531 long next_s = 0, next_e = 0;
1532
1533 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1534
1535 /*
1536 * Read the main descriptor sequence and find which descriptors
1537 * are in it.
1538 */
1539 for (; (!done && block <= lastblock); block++) {
1540
1541 bh = udf_read_tagged(sb, block, block, &ident);
1542 if (!bh) {
1543 udf_err(sb,
1544 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1545 (unsigned long long)block);
1546 return 1;
1547 }
1548
1549 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1550 gd = (struct generic_desc *)bh->b_data;
1551 vdsn = le32_to_cpu(gd->volDescSeqNum);
1552 switch (ident) {
1553 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1554 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1555 if (vdsn >= curr->volDescSeqNum) {
1556 curr->volDescSeqNum = vdsn;
1557 curr->block = block;
1558 }
1559 break;
1560 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1561 curr = &vds[VDS_POS_VOL_DESC_PTR];
1562 if (vdsn >= curr->volDescSeqNum) {
1563 curr->volDescSeqNum = vdsn;
1564 curr->block = block;
1565
1566 vdp = (struct volDescPtr *)bh->b_data;
1567 next_s = le32_to_cpu(
1568 vdp->nextVolDescSeqExt.extLocation);
1569 next_e = le32_to_cpu(
1570 vdp->nextVolDescSeqExt.extLength);
1571 next_e = next_e >> sb->s_blocksize_bits;
1572 next_e += next_s;
1573 }
1574 break;
1575 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1576 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1577 if (vdsn >= curr->volDescSeqNum) {
1578 curr->volDescSeqNum = vdsn;
1579 curr->block = block;
1580 }
1581 break;
1582 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1583 curr = &vds[VDS_POS_PARTITION_DESC];
1584 if (!curr->block)
1585 curr->block = block;
1586 break;
1587 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1588 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1589 if (vdsn >= curr->volDescSeqNum) {
1590 curr->volDescSeqNum = vdsn;
1591 curr->block = block;
1592 }
1593 break;
1594 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1595 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1596 if (vdsn >= curr->volDescSeqNum) {
1597 curr->volDescSeqNum = vdsn;
1598 curr->block = block;
1599 }
1600 break;
1601 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1602 vds[VDS_POS_TERMINATING_DESC].block = block;
1603 if (next_e) {
1604 block = next_s;
1605 lastblock = next_e;
1606 next_s = next_e = 0;
1607 } else
1608 done = 1;
1609 break;
1610 }
1611 brelse(bh);
1612 }
1613 /*
1614 * Now read interesting descriptors again and process them
1615 * in a suitable order
1616 */
1617 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1618 udf_err(sb, "Primary Volume Descriptor not found!\n");
1619 return 1;
1620 }
1621 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1622 return 1;
1623
1624 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1625 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1626 return 1;
1627
1628 if (vds[VDS_POS_PARTITION_DESC].block) {
1629 /*
1630 * We rescan the whole descriptor sequence to find
1631 * partition descriptor blocks and process them.
1632 */
1633 for (block = vds[VDS_POS_PARTITION_DESC].block;
1634 block < vds[VDS_POS_TERMINATING_DESC].block;
1635 block++)
1636 if (udf_load_partdesc(sb, block))
1637 return 1;
1638 }
1639
1640 return 0;
1641 }
1642
1643 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1644 struct kernel_lb_addr *fileset)
1645 {
1646 struct anchorVolDescPtr *anchor;
1647 long main_s, main_e, reserve_s, reserve_e;
1648
1649 anchor = (struct anchorVolDescPtr *)bh->b_data;
1650
1651 /* Locate the main sequence */
1652 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1653 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1654 main_e = main_e >> sb->s_blocksize_bits;
1655 main_e += main_s;
1656
1657 /* Locate the reserve sequence */
1658 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1659 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1660 reserve_e = reserve_e >> sb->s_blocksize_bits;
1661 reserve_e += reserve_s;
1662
1663 /* Process the main & reserve sequences */
1664 /* responsible for finding the PartitionDesc(s) */
1665 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1666 return 1;
1667 udf_sb_free_partitions(sb);
1668 if (!udf_process_sequence(sb, reserve_s, reserve_e, fileset))
1669 return 1;
1670 udf_sb_free_partitions(sb);
1671 return 0;
1672 }
1673
1674 /*
1675 * Check whether there is an anchor block in the given block and
1676 * load Volume Descriptor Sequence if so.
1677 */
1678 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1679 struct kernel_lb_addr *fileset)
1680 {
1681 struct buffer_head *bh;
1682 uint16_t ident;
1683 int ret;
1684
1685 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1686 udf_fixed_to_variable(block) >=
1687 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1688 return 0;
1689
1690 bh = udf_read_tagged(sb, block, block, &ident);
1691 if (!bh)
1692 return 0;
1693 if (ident != TAG_IDENT_AVDP) {
1694 brelse(bh);
1695 return 0;
1696 }
1697 ret = udf_load_sequence(sb, bh, fileset);
1698 brelse(bh);
1699 return ret;
1700 }
1701
1702 /* Search for an anchor volume descriptor pointer */
1703 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1704 struct kernel_lb_addr *fileset)
1705 {
1706 sector_t last[6];
1707 int i;
1708 struct udf_sb_info *sbi = UDF_SB(sb);
1709 int last_count = 0;
1710
1711 /* First try user provided anchor */
1712 if (sbi->s_anchor) {
1713 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1714 return lastblock;
1715 }
1716 /*
1717 * according to spec, anchor is in either:
1718 * block 256
1719 * lastblock-256
1720 * lastblock
1721 * however, if the disc isn't closed, it could be 512.
1722 */
1723 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1724 return lastblock;
1725 /*
1726 * The trouble is which block is the last one. Drives often misreport
1727 * this so we try various possibilities.
1728 */
1729 last[last_count++] = lastblock;
1730 if (lastblock >= 1)
1731 last[last_count++] = lastblock - 1;
1732 last[last_count++] = lastblock + 1;
1733 if (lastblock >= 2)
1734 last[last_count++] = lastblock - 2;
1735 if (lastblock >= 150)
1736 last[last_count++] = lastblock - 150;
1737 if (lastblock >= 152)
1738 last[last_count++] = lastblock - 152;
1739
1740 for (i = 0; i < last_count; i++) {
1741 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1742 sb->s_blocksize_bits)
1743 continue;
1744 if (udf_check_anchor_block(sb, last[i], fileset))
1745 return last[i];
1746 if (last[i] < 256)
1747 continue;
1748 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1749 return last[i];
1750 }
1751
1752 /* Finally try block 512 in case media is open */
1753 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1754 return last[0];
1755 return 0;
1756 }
1757
1758 /*
1759 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1760 * area specified by it. The function expects sbi->s_lastblock to be the last
1761 * block on the media.
1762 *
1763 * Return 1 if ok, 0 if not found.
1764 *
1765 */
1766 static int udf_find_anchor(struct super_block *sb,
1767 struct kernel_lb_addr *fileset)
1768 {
1769 sector_t lastblock;
1770 struct udf_sb_info *sbi = UDF_SB(sb);
1771
1772 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1773 if (lastblock)
1774 goto out;
1775
1776 /* No anchor found? Try VARCONV conversion of block numbers */
1777 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1778 /* Firstly, we try to not convert number of the last block */
1779 lastblock = udf_scan_anchors(sb,
1780 udf_variable_to_fixed(sbi->s_last_block),
1781 fileset);
1782 if (lastblock)
1783 goto out;
1784
1785 /* Secondly, we try with converted number of the last block */
1786 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1787 if (!lastblock) {
1788 /* VARCONV didn't help. Clear it. */
1789 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1790 return 0;
1791 }
1792 out:
1793 sbi->s_last_block = lastblock;
1794 return 1;
1795 }
1796
1797 /*
1798 * Check Volume Structure Descriptor, find Anchor block and load Volume
1799 * Descriptor Sequence
1800 */
1801 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1802 int silent, struct kernel_lb_addr *fileset)
1803 {
1804 struct udf_sb_info *sbi = UDF_SB(sb);
1805 loff_t nsr_off;
1806
1807 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1808 if (!silent)
1809 udf_warn(sb, "Bad block size\n");
1810 return 0;
1811 }
1812 sbi->s_last_block = uopt->lastblock;
1813 if (!uopt->novrs) {
1814 /* Check that it is NSR02 compliant */
1815 nsr_off = udf_check_vsd(sb);
1816 if (!nsr_off) {
1817 if (!silent)
1818 udf_warn(sb, "No VRS found\n");
1819 return 0;
1820 }
1821 if (nsr_off == -1)
1822 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1823 if (!sbi->s_last_block)
1824 sbi->s_last_block = udf_get_last_block(sb);
1825 } else {
1826 udf_debug("Validity check skipped because of novrs option\n");
1827 }
1828
1829 /* Look for anchor block and load Volume Descriptor Sequence */
1830 sbi->s_anchor = uopt->anchor;
1831 if (!udf_find_anchor(sb, fileset)) {
1832 if (!silent)
1833 udf_warn(sb, "No anchor found\n");
1834 return 0;
1835 }
1836 return 1;
1837 }
1838
1839 static void udf_open_lvid(struct super_block *sb)
1840 {
1841 struct udf_sb_info *sbi = UDF_SB(sb);
1842 struct buffer_head *bh = sbi->s_lvid_bh;
1843 struct logicalVolIntegrityDesc *lvid;
1844 struct logicalVolIntegrityDescImpUse *lvidiu;
1845
1846 if (!bh)
1847 return;
1848
1849 mutex_lock(&sbi->s_alloc_mutex);
1850 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1851 lvidiu = udf_sb_lvidiu(sbi);
1852
1853 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1854 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1855 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1856 CURRENT_TIME);
1857 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1858
1859 lvid->descTag.descCRC = cpu_to_le16(
1860 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1861 le16_to_cpu(lvid->descTag.descCRCLength)));
1862
1863 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1864 mark_buffer_dirty(bh);
1865 sbi->s_lvid_dirty = 0;
1866 mutex_unlock(&sbi->s_alloc_mutex);
1867 /* Make opening of filesystem visible on the media immediately */
1868 sync_dirty_buffer(bh);
1869 }
1870
1871 static void udf_close_lvid(struct super_block *sb)
1872 {
1873 struct udf_sb_info *sbi = UDF_SB(sb);
1874 struct buffer_head *bh = sbi->s_lvid_bh;
1875 struct logicalVolIntegrityDesc *lvid;
1876 struct logicalVolIntegrityDescImpUse *lvidiu;
1877
1878 if (!bh)
1879 return;
1880
1881 mutex_lock(&sbi->s_alloc_mutex);
1882 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1883 lvidiu = udf_sb_lvidiu(sbi);
1884 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1885 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1886 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1887 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1888 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1889 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1890 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1891 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1892 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1893 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1894
1895 lvid->descTag.descCRC = cpu_to_le16(
1896 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1897 le16_to_cpu(lvid->descTag.descCRCLength)));
1898
1899 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1900 /*
1901 * We set buffer uptodate unconditionally here to avoid spurious
1902 * warnings from mark_buffer_dirty() when previous EIO has marked
1903 * the buffer as !uptodate
1904 */
1905 set_buffer_uptodate(bh);
1906 mark_buffer_dirty(bh);
1907 sbi->s_lvid_dirty = 0;
1908 mutex_unlock(&sbi->s_alloc_mutex);
1909 /* Make closing of filesystem visible on the media immediately */
1910 sync_dirty_buffer(bh);
1911 }
1912
1913 u64 lvid_get_unique_id(struct super_block *sb)
1914 {
1915 struct buffer_head *bh;
1916 struct udf_sb_info *sbi = UDF_SB(sb);
1917 struct logicalVolIntegrityDesc *lvid;
1918 struct logicalVolHeaderDesc *lvhd;
1919 u64 uniqueID;
1920 u64 ret;
1921
1922 bh = sbi->s_lvid_bh;
1923 if (!bh)
1924 return 0;
1925
1926 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1927 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1928
1929 mutex_lock(&sbi->s_alloc_mutex);
1930 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1931 if (!(++uniqueID & 0xFFFFFFFF))
1932 uniqueID += 16;
1933 lvhd->uniqueID = cpu_to_le64(uniqueID);
1934 mutex_unlock(&sbi->s_alloc_mutex);
1935 mark_buffer_dirty(bh);
1936
1937 return ret;
1938 }
1939
1940 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1941 {
1942 int ret;
1943 struct inode *inode = NULL;
1944 struct udf_options uopt;
1945 struct kernel_lb_addr rootdir, fileset;
1946 struct udf_sb_info *sbi;
1947
1948 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1949 uopt.uid = INVALID_UID;
1950 uopt.gid = INVALID_GID;
1951 uopt.umask = 0;
1952 uopt.fmode = UDF_INVALID_MODE;
1953 uopt.dmode = UDF_INVALID_MODE;
1954
1955 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1956 if (!sbi)
1957 return -ENOMEM;
1958
1959 sb->s_fs_info = sbi;
1960
1961 mutex_init(&sbi->s_alloc_mutex);
1962
1963 if (!udf_parse_options((char *)options, &uopt, false))
1964 goto error_out;
1965
1966 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1967 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1968 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1969 goto error_out;
1970 }
1971 #ifdef CONFIG_UDF_NLS
1972 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1973 uopt.nls_map = load_nls_default();
1974 if (!uopt.nls_map)
1975 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1976 else
1977 udf_debug("Using default NLS map\n");
1978 }
1979 #endif
1980 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1981 uopt.flags |= (1 << UDF_FLAG_UTF8);
1982
1983 fileset.logicalBlockNum = 0xFFFFFFFF;
1984 fileset.partitionReferenceNum = 0xFFFF;
1985
1986 sbi->s_flags = uopt.flags;
1987 sbi->s_uid = uopt.uid;
1988 sbi->s_gid = uopt.gid;
1989 sbi->s_umask = uopt.umask;
1990 sbi->s_fmode = uopt.fmode;
1991 sbi->s_dmode = uopt.dmode;
1992 sbi->s_nls_map = uopt.nls_map;
1993 rwlock_init(&sbi->s_cred_lock);
1994
1995 if (uopt.session == 0xFFFFFFFF)
1996 sbi->s_session = udf_get_last_session(sb);
1997 else
1998 sbi->s_session = uopt.session;
1999
2000 udf_debug("Multi-session=%d\n", sbi->s_session);
2001
2002 /* Fill in the rest of the superblock */
2003 sb->s_op = &udf_sb_ops;
2004 sb->s_export_op = &udf_export_ops;
2005
2006 sb->s_magic = UDF_SUPER_MAGIC;
2007 sb->s_time_gran = 1000;
2008
2009 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2010 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2011 } else {
2012 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2013 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2014 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2015 if (!silent)
2016 pr_notice("Rescanning with blocksize %d\n",
2017 UDF_DEFAULT_BLOCKSIZE);
2018 brelse(sbi->s_lvid_bh);
2019 sbi->s_lvid_bh = NULL;
2020 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2021 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2022 }
2023 }
2024 if (!ret) {
2025 udf_warn(sb, "No partition found (1)\n");
2026 goto error_out;
2027 }
2028
2029 udf_debug("Lastblock=%d\n", sbi->s_last_block);
2030
2031 if (sbi->s_lvid_bh) {
2032 struct logicalVolIntegrityDescImpUse *lvidiu =
2033 udf_sb_lvidiu(sbi);
2034 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2035 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2036 /* uint16_t maxUDFWriteRev =
2037 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2038
2039 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2040 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2041 le16_to_cpu(lvidiu->minUDFReadRev),
2042 UDF_MAX_READ_VERSION);
2043 goto error_out;
2044 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2045 sb->s_flags |= MS_RDONLY;
2046
2047 sbi->s_udfrev = minUDFWriteRev;
2048
2049 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2050 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2051 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2052 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2053 }
2054
2055 if (!sbi->s_partitions) {
2056 udf_warn(sb, "No partition found (2)\n");
2057 goto error_out;
2058 }
2059
2060 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2061 UDF_PART_FLAG_READ_ONLY) {
2062 pr_notice("Partition marked readonly; forcing readonly mount\n");
2063 sb->s_flags |= MS_RDONLY;
2064 }
2065
2066 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2067 udf_warn(sb, "No fileset found\n");
2068 goto error_out;
2069 }
2070
2071 if (!silent) {
2072 struct timestamp ts;
2073 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2074 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2075 sbi->s_volume_ident,
2076 le16_to_cpu(ts.year), ts.month, ts.day,
2077 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2078 }
2079 if (!(sb->s_flags & MS_RDONLY))
2080 udf_open_lvid(sb);
2081
2082 /* Assign the root inode */
2083 /* assign inodes by physical block number */
2084 /* perhaps it's not extensible enough, but for now ... */
2085 inode = udf_iget(sb, &rootdir);
2086 if (!inode) {
2087 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2088 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2089 goto error_out;
2090 }
2091
2092 /* Allocate a dentry for the root inode */
2093 sb->s_root = d_make_root(inode);
2094 if (!sb->s_root) {
2095 udf_err(sb, "Couldn't allocate root dentry\n");
2096 goto error_out;
2097 }
2098 sb->s_maxbytes = MAX_LFS_FILESIZE;
2099 sb->s_max_links = UDF_MAX_LINKS;
2100 return 0;
2101
2102 error_out:
2103 if (sbi->s_vat_inode)
2104 iput(sbi->s_vat_inode);
2105 #ifdef CONFIG_UDF_NLS
2106 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2107 unload_nls(sbi->s_nls_map);
2108 #endif
2109 if (!(sb->s_flags & MS_RDONLY))
2110 udf_close_lvid(sb);
2111 brelse(sbi->s_lvid_bh);
2112 udf_sb_free_partitions(sb);
2113 kfree(sbi);
2114 sb->s_fs_info = NULL;
2115
2116 return -EINVAL;
2117 }
2118
2119 void _udf_err(struct super_block *sb, const char *function,
2120 const char *fmt, ...)
2121 {
2122 struct va_format vaf;
2123 va_list args;
2124
2125 va_start(args, fmt);
2126
2127 vaf.fmt = fmt;
2128 vaf.va = &args;
2129
2130 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2131
2132 va_end(args);
2133 }
2134
2135 void _udf_warn(struct super_block *sb, const char *function,
2136 const char *fmt, ...)
2137 {
2138 struct va_format vaf;
2139 va_list args;
2140
2141 va_start(args, fmt);
2142
2143 vaf.fmt = fmt;
2144 vaf.va = &args;
2145
2146 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2147
2148 va_end(args);
2149 }
2150
2151 static void udf_put_super(struct super_block *sb)
2152 {
2153 struct udf_sb_info *sbi;
2154
2155 sbi = UDF_SB(sb);
2156
2157 if (sbi->s_vat_inode)
2158 iput(sbi->s_vat_inode);
2159 #ifdef CONFIG_UDF_NLS
2160 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2161 unload_nls(sbi->s_nls_map);
2162 #endif
2163 if (!(sb->s_flags & MS_RDONLY))
2164 udf_close_lvid(sb);
2165 brelse(sbi->s_lvid_bh);
2166 udf_sb_free_partitions(sb);
2167 kfree(sb->s_fs_info);
2168 sb->s_fs_info = NULL;
2169 }
2170
2171 static int udf_sync_fs(struct super_block *sb, int wait)
2172 {
2173 struct udf_sb_info *sbi = UDF_SB(sb);
2174
2175 mutex_lock(&sbi->s_alloc_mutex);
2176 if (sbi->s_lvid_dirty) {
2177 /*
2178 * Blockdevice will be synced later so we don't have to submit
2179 * the buffer for IO
2180 */
2181 mark_buffer_dirty(sbi->s_lvid_bh);
2182 sbi->s_lvid_dirty = 0;
2183 }
2184 mutex_unlock(&sbi->s_alloc_mutex);
2185
2186 return 0;
2187 }
2188
2189 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2190 {
2191 struct super_block *sb = dentry->d_sb;
2192 struct udf_sb_info *sbi = UDF_SB(sb);
2193 struct logicalVolIntegrityDescImpUse *lvidiu;
2194 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2195
2196 if (sbi->s_lvid_bh != NULL)
2197 lvidiu = udf_sb_lvidiu(sbi);
2198 else
2199 lvidiu = NULL;
2200
2201 buf->f_type = UDF_SUPER_MAGIC;
2202 buf->f_bsize = sb->s_blocksize;
2203 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2204 buf->f_bfree = udf_count_free(sb);
2205 buf->f_bavail = buf->f_bfree;
2206 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2207 le32_to_cpu(lvidiu->numDirs)) : 0)
2208 + buf->f_bfree;
2209 buf->f_ffree = buf->f_bfree;
2210 buf->f_namelen = UDF_NAME_LEN - 2;
2211 buf->f_fsid.val[0] = (u32)id;
2212 buf->f_fsid.val[1] = (u32)(id >> 32);
2213
2214 return 0;
2215 }
2216
2217 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2218 struct udf_bitmap *bitmap)
2219 {
2220 struct buffer_head *bh = NULL;
2221 unsigned int accum = 0;
2222 int index;
2223 int block = 0, newblock;
2224 struct kernel_lb_addr loc;
2225 uint32_t bytes;
2226 uint8_t *ptr;
2227 uint16_t ident;
2228 struct spaceBitmapDesc *bm;
2229
2230 loc.logicalBlockNum = bitmap->s_extPosition;
2231 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2232 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2233
2234 if (!bh) {
2235 udf_err(sb, "udf_count_free failed\n");
2236 goto out;
2237 } else if (ident != TAG_IDENT_SBD) {
2238 brelse(bh);
2239 udf_err(sb, "udf_count_free failed\n");
2240 goto out;
2241 }
2242
2243 bm = (struct spaceBitmapDesc *)bh->b_data;
2244 bytes = le32_to_cpu(bm->numOfBytes);
2245 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2246 ptr = (uint8_t *)bh->b_data;
2247
2248 while (bytes > 0) {
2249 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2250 accum += bitmap_weight((const unsigned long *)(ptr + index),
2251 cur_bytes * 8);
2252 bytes -= cur_bytes;
2253 if (bytes) {
2254 brelse(bh);
2255 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2256 bh = udf_tread(sb, newblock);
2257 if (!bh) {
2258 udf_debug("read failed\n");
2259 goto out;
2260 }
2261 index = 0;
2262 ptr = (uint8_t *)bh->b_data;
2263 }
2264 }
2265 brelse(bh);
2266 out:
2267 return accum;
2268 }
2269
2270 static unsigned int udf_count_free_table(struct super_block *sb,
2271 struct inode *table)
2272 {
2273 unsigned int accum = 0;
2274 uint32_t elen;
2275 struct kernel_lb_addr eloc;
2276 int8_t etype;
2277 struct extent_position epos;
2278
2279 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2280 epos.block = UDF_I(table)->i_location;
2281 epos.offset = sizeof(struct unallocSpaceEntry);
2282 epos.bh = NULL;
2283
2284 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2285 accum += (elen >> table->i_sb->s_blocksize_bits);
2286
2287 brelse(epos.bh);
2288 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2289
2290 return accum;
2291 }
2292
2293 static unsigned int udf_count_free(struct super_block *sb)
2294 {
2295 unsigned int accum = 0;
2296 struct udf_sb_info *sbi;
2297 struct udf_part_map *map;
2298
2299 sbi = UDF_SB(sb);
2300 if (sbi->s_lvid_bh) {
2301 struct logicalVolIntegrityDesc *lvid =
2302 (struct logicalVolIntegrityDesc *)
2303 sbi->s_lvid_bh->b_data;
2304 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2305 accum = le32_to_cpu(
2306 lvid->freeSpaceTable[sbi->s_partition]);
2307 if (accum == 0xFFFFFFFF)
2308 accum = 0;
2309 }
2310 }
2311
2312 if (accum)
2313 return accum;
2314
2315 map = &sbi->s_partmaps[sbi->s_partition];
2316 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2317 accum += udf_count_free_bitmap(sb,
2318 map->s_uspace.s_bitmap);
2319 }
2320 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2321 accum += udf_count_free_bitmap(sb,
2322 map->s_fspace.s_bitmap);
2323 }
2324 if (accum)
2325 return accum;
2326
2327 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2328 accum += udf_count_free_table(sb,
2329 map->s_uspace.s_table);
2330 }
2331 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2332 accum += udf_count_free_table(sb,
2333 map->s_fspace.s_table);
2334 }
2335
2336 return accum;
2337 }
Linus' kernel tree