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udf: Simplify handling of Volume Descriptor Pointers
[mirror_ubuntu-hirsute-kernel.git] / fs / udf / super.c
CommitLineData
1da177e4
LT		 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 *
1da177e4
LT		 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
3a71fc5d
MS		 36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
1da177e4
LT		 38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
cb00ea35 41#include "udfdecl.h"
1da177e4 42
1da177e4
LT		 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>
1da177e4
LT		 51#include <linux/vfs.h>
52#include <linux/vmalloc.h>
dc5d39be 53#include <linux/errno.h>
6da80894
MS		 54#include <linux/mount.h>
55#include <linux/seq_file.h>
01b954a3 56#include <linux/bitmap.h>
f845fced 57#include <linux/crc-itu-t.h>
1df2ae31 58#include <linux/log2.h>
1da177e4
LT		 59#include <asm/byteorder.h>
60
1da177e4
LT		 61#include "udf_sb.h"
62#include "udf_i.h"
63
64#include <linux/init.h>
e973606c 65#include <linux/uaccess.h>
1da177e4
LT		 66
67#define VDS_POS_PRIMARY_VOL_DESC 0
68#define VDS_POS_UNALLOC_SPACE_DESC 1
69#define VDS_POS_LOGICAL_VOL_DESC 2
70#define VDS_POS_PARTITION_DESC 3
71#define VDS_POS_IMP_USE_VOL_DESC 4
72#define VDS_POS_VOL_DESC_PTR 5
73#define VDS_POS_TERMINATING_DESC 6
74#define VDS_POS_LENGTH 7
75
44499602
PF		 76#define VSD_FIRST_SECTOR_OFFSET 32768
77#define VSD_MAX_SECTOR_OFFSET 0x800000
78
a47241cd
AT		 79/*
80 * Maximum number of Terminating Descriptor / Logical Volume Integrity
81 * Descriptor redirections. The chosen numbers are arbitrary - just that we
82 * hopefully don't limit any real use of rewritten inode on write-once media
83 * but avoid looping for too long on corrupted media.
84 */
85#define UDF_MAX_TD_NESTING 64
86#define UDF_MAX_LVID_NESTING 1000
87
8de52778
AV		 88enum { UDF_MAX_LINKS = 0xffff };
89
1da177e4
LT		 90/* These are the "meat" - everything else is stuffing */
91static int udf_fill_super(struct super_block *, void *, int);
92static void udf_put_super(struct super_block *);
146bca72 93static int udf_sync_fs(struct super_block *, int);
1da177e4 94static int udf_remount_fs(struct super_block *, int *, char *);
5ca4e4be 95static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
5ca4e4be
PE		 96static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
97 struct kernel_lb_addr *);
cb00ea35 98static void udf_load_fileset(struct super_block *, struct buffer_head *,
5ca4e4be 99 struct kernel_lb_addr *);
1da177e4
LT		 100static void udf_open_lvid(struct super_block *);
101static void udf_close_lvid(struct super_block *);
102static unsigned int udf_count_free(struct super_block *);
726c3342 103static int udf_statfs(struct dentry *, struct kstatfs *);
34c80b1d 104static int udf_show_options(struct seq_file *, struct dentry *);
1da177e4 105
69d75671 106struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
6c79e987 107{
69d75671
JK		 108 struct logicalVolIntegrityDesc *lvid;
109 unsigned int partnum;
110 unsigned int offset;
111
112 if (!UDF_SB(sb)->s_lvid_bh)
113 return NULL;
114 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
115 partnum = le32_to_cpu(lvid->numOfPartitions);
116 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
117 offsetof(struct logicalVolIntegrityDesc, impUse)) /
118 (2 * sizeof(uint32_t)) < partnum) {
119 udf_err(sb, "Logical volume integrity descriptor corrupted "
120 "(numOfPartitions = %u)!\n", partnum);
121 return NULL;
122 }
123 /* The offset is to skip freeSpaceTable and sizeTable arrays */
124 offset = partnum * 2 * sizeof(uint32_t);
6c79e987
MS		 125 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
126}
127
1da177e4 128/* UDF filesystem type */
152a0836
AV		 129static struct dentry *udf_mount(struct file_system_type *fs_type,
130 int flags, const char *dev_name, void *data)
1da177e4 131{
152a0836 132 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
1da177e4
LT		 133}
134
135static struct file_system_type udf_fstype = {
28de7948
CG		 136 .owner = THIS_MODULE,
137 .name = "udf",
152a0836 138 .mount = udf_mount,
28de7948
CG		 139 .kill_sb = kill_block_super,
140 .fs_flags = FS_REQUIRES_DEV,
1da177e4 141};
3e64fe5b 142MODULE_ALIAS_FS("udf");
1da177e4 143
cb00ea35 144static struct kmem_cache *udf_inode_cachep;
1da177e4
LT		 145
146static struct inode *udf_alloc_inode(struct super_block *sb)
147{
148 struct udf_inode_info *ei;
3a71fc5d 149 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
1da177e4
LT		 150 if (!ei)
151 return NULL;
95f8797f
DB		 152
153 ei->i_unique = 0;
154 ei->i_lenExtents = 0;
155 ei->i_next_alloc_block = 0;
156 ei->i_next_alloc_goal = 0;
157 ei->i_strat4096 = 0;
4d0fb621 158 init_rwsem(&ei->i_data_sem);
99600051
NJ		 159 ei->cached_extent.lstart = -1;
160 spin_lock_init(&ei->i_extent_cache_lock);
95f8797f 161
1da177e4
LT		 162 return &ei->vfs_inode;
163}
164
fa0d7e3d 165static void udf_i_callback(struct rcu_head *head)
1da177e4 166{
fa0d7e3d 167 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 168 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
169}
170
fa0d7e3d
NP		 171static void udf_destroy_inode(struct inode *inode)
172{
173 call_rcu(&inode->i_rcu, udf_i_callback);
174}
175
51cc5068 176static void init_once(void *foo)
1da177e4 177{
cb00ea35 178 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
1da177e4 179
a35afb83
CL		 180 ei->i_ext.i_data = NULL;
181 inode_init_once(&ei->vfs_inode);
1da177e4
LT		 182}
183
53ea18de 184static int __init init_inodecache(void)
1da177e4
LT		 185{
186 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
187 sizeof(struct udf_inode_info),
cb00ea35 188 0, (SLAB_RECLAIM_ACCOUNT |
5d097056
VD		 189 SLAB_MEM_SPREAD |
190 SLAB_ACCOUNT),
20c2df83 191 init_once);
28de7948 192 if (!udf_inode_cachep)
1da177e4
LT		 193 return -ENOMEM;
194 return 0;
195}
196
197static void destroy_inodecache(void)
198{
8c0a8537
KS		 199 /*
200 * Make sure all delayed rcu free inodes are flushed before we
201 * destroy cache.
202 */
203 rcu_barrier();
1a1d92c1 204 kmem_cache_destroy(udf_inode_cachep);
1da177e4
LT		 205}
206
207/* Superblock operations */
ee9b6d61 208static const struct super_operations udf_sb_ops = {
28de7948
CG		 209 .alloc_inode = udf_alloc_inode,
210 .destroy_inode = udf_destroy_inode,
211 .write_inode = udf_write_inode,
3aac2b62 212 .evict_inode = udf_evict_inode,
28de7948 213 .put_super = udf_put_super,
146bca72 214 .sync_fs = udf_sync_fs,
28de7948
CG		 215 .statfs = udf_statfs,
216 .remount_fs = udf_remount_fs,
6da80894 217 .show_options = udf_show_options,
1da177e4
LT		 218};
219
cb00ea35 220struct udf_options {
1da177e4
LT		 221 unsigned char novrs;
222 unsigned int blocksize;
223 unsigned int session;
224 unsigned int lastblock;
225 unsigned int anchor;
226 unsigned int volume;
227 unsigned short partition;
228 unsigned int fileset;
229 unsigned int rootdir;
230 unsigned int flags;
faa17292 231 umode_t umask;
c2ba138a
EB		 232 kgid_t gid;
233 kuid_t uid;
faa17292
AV		 234 umode_t fmode;
235 umode_t dmode;
1da177e4
LT		 236 struct nls_table *nls_map;
237};
238
239static int __init init_udf_fs(void)
240{
241 int err;
28de7948 242
1da177e4
LT		 243 err = init_inodecache();
244 if (err)
245 goto out1;
246 err = register_filesystem(&udf_fstype);
247 if (err)
248 goto out;
28de7948 249
1da177e4 250 return 0;
28de7948
CG		 251
252out:
1da177e4 253 destroy_inodecache();
28de7948
CG		 254
255out1:
1da177e4
LT		 256 return err;
257}
258
259static void __exit exit_udf_fs(void)
260{
261 unregister_filesystem(&udf_fstype);
262 destroy_inodecache();
263}
264
dc5d39be
MS		 265static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
266{
267 struct udf_sb_info *sbi = UDF_SB(sb);
268
033c9da0 269 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
dc5d39be 270 if (!sbi->s_partmaps) {
dc5d39be
MS		 271 sbi->s_partitions = 0;
272 return -ENOMEM;
273 }
274
275 sbi->s_partitions = count;
276 return 0;
277}
278
bff943af
JK		 279static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
280{
281 int i;
282 int nr_groups = bitmap->s_nr_groups;
bff943af
JK		 283
284 for (i = 0; i < nr_groups; i++)
285 if (bitmap->s_block_bitmap[i])
286 brelse(bitmap->s_block_bitmap[i]);
287
1d5cfdb0 288 kvfree(bitmap);
bff943af
JK		 289}
290
291static void udf_free_partition(struct udf_part_map *map)
292{
293 int i;
294 struct udf_meta_data *mdata;
295
296 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
297 iput(map->s_uspace.s_table);
298 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
299 iput(map->s_fspace.s_table);
300 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
301 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
302 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
303 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
304 if (map->s_partition_type == UDF_SPARABLE_MAP15)
305 for (i = 0; i < 4; i++)
306 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
307 else if (map->s_partition_type == UDF_METADATA_MAP25) {
308 mdata = &map->s_type_specific.s_metadata;
309 iput(mdata->s_metadata_fe);
310 mdata->s_metadata_fe = NULL;
311
312 iput(mdata->s_mirror_fe);
313 mdata->s_mirror_fe = NULL;
314
315 iput(mdata->s_bitmap_fe);
316 mdata->s_bitmap_fe = NULL;
317 }
318}
319
320static void udf_sb_free_partitions(struct super_block *sb)
321{
322 struct udf_sb_info *sbi = UDF_SB(sb);
323 int i;
ba2eb866
ME		 324
325 if (!sbi->s_partmaps)
1b1baff6 326 return;
bff943af
JK		 327 for (i = 0; i < sbi->s_partitions; i++)
328 udf_free_partition(&sbi->s_partmaps[i]);
329 kfree(sbi->s_partmaps);
330 sbi->s_partmaps = NULL;
331}
332
34c80b1d 333static int udf_show_options(struct seq_file *seq, struct dentry *root)
6da80894 334{
34c80b1d 335 struct super_block *sb = root->d_sb;
6da80894
MS		 336 struct udf_sb_info *sbi = UDF_SB(sb);
337
338 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
339 seq_puts(seq, ",nostrict");
1197e4df 340 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
6da80894
MS		 341 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
342 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
343 seq_puts(seq, ",unhide");
344 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
345 seq_puts(seq, ",undelete");
346 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
347 seq_puts(seq, ",noadinicb");
348 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
349 seq_puts(seq, ",shortad");
350 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
351 seq_puts(seq, ",uid=forget");
352 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
353 seq_puts(seq, ",uid=ignore");
354 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
355 seq_puts(seq, ",gid=forget");
356 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
357 seq_puts(seq, ",gid=ignore");
358 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
c2ba138a 359 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
6da80894 360 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
c2ba138a 361 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
6da80894 362 if (sbi->s_umask != 0)
faa17292 363 seq_printf(seq, ",umask=%ho", sbi->s_umask);
87bc730c 364 if (sbi->s_fmode != UDF_INVALID_MODE)
faa17292 365 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
87bc730c 366 if (sbi->s_dmode != UDF_INVALID_MODE)
faa17292 367 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
6da80894 368 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
fcbf7637 369 seq_printf(seq, ",session=%d", sbi->s_session);
6da80894
MS		 370 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
371 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
40346005
JK		 372 if (sbi->s_anchor != 0)
373 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
6da80894
MS		 374 /*
375 * volume, partition, fileset and rootdir seem to be ignored
376 * currently
377 */
378 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
379 seq_puts(seq, ",utf8");
380 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
381 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
382
383 return 0;
384}
385
1da177e4
LT		 386/*
387 * udf_parse_options
388 *
389 * PURPOSE
390 * Parse mount options.
391 *
392 * DESCRIPTION
393 * The following mount options are supported:
394 *
395 * gid= Set the default group.
396 * umask= Set the default umask.
7ac9bcd5
MS		 397 * mode= Set the default file permissions.
398 * dmode= Set the default directory permissions.
1da177e4
LT		 399 * uid= Set the default user.
400 * bs= Set the block size.
401 * unhide Show otherwise hidden files.
402 * undelete Show deleted files in lists.
403 * adinicb Embed data in the inode (default)
404 * noadinicb Don't embed data in the inode
405 * shortad Use short ad's
406 * longad Use long ad's (default)
407 * nostrict Unset strict conformance
408 * iocharset= Set the NLS character set
409 *
410 * The remaining are for debugging and disaster recovery:
411 *
28de7948 412 * novrs Skip volume sequence recognition
1da177e4
LT		 413 *
414 * The following expect a offset from 0.
415 *
416 * session= Set the CDROM session (default= last session)
417 * anchor= Override standard anchor location. (default= 256)
418 * volume= Override the VolumeDesc location. (unused)
419 * partition= Override the PartitionDesc location. (unused)
420 * lastblock= Set the last block of the filesystem/
421 *
422 * The following expect a offset from the partition root.
423 *
424 * fileset= Override the fileset block location. (unused)
425 * rootdir= Override the root directory location. (unused)
426 * WARNING: overriding the rootdir to a non-directory may
427 * yield highly unpredictable results.
428 *
429 * PRE-CONDITIONS
430 * options Pointer to mount options string.
431 * uopts Pointer to mount options variable.
432 *
433 * POST-CONDITIONS
434 * <return> 1 Mount options parsed okay.
435 * <return> 0 Error parsing mount options.
436 *
437 * HISTORY
438 * July 1, 1997 - Andrew E. Mileski
439 * Written, tested, and released.
440 */
28de7948 441
1da177e4
LT		 442enum {
443 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
444 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
445 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
446 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
447 Opt_rootdir, Opt_utf8, Opt_iocharset,
7ac9bcd5
MS		 448 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
449 Opt_fmode, Opt_dmode
1da177e4
LT		 450};
451
a447c093 452static const match_table_t tokens = {
28de7948
CG		 453 {Opt_novrs, "novrs"},
454 {Opt_nostrict, "nostrict"},
455 {Opt_bs, "bs=%u"},
456 {Opt_unhide, "unhide"},
457 {Opt_undelete, "undelete"},
458 {Opt_noadinicb, "noadinicb"},
459 {Opt_adinicb, "adinicb"},
460 {Opt_shortad, "shortad"},
461 {Opt_longad, "longad"},
462 {Opt_uforget, "uid=forget"},
463 {Opt_uignore, "uid=ignore"},
464 {Opt_gforget, "gid=forget"},
465 {Opt_gignore, "gid=ignore"},
466 {Opt_gid, "gid=%u"},
467 {Opt_uid, "uid=%u"},
468 {Opt_umask, "umask=%o"},
469 {Opt_session, "session=%u"},
470 {Opt_lastblock, "lastblock=%u"},
471 {Opt_anchor, "anchor=%u"},
472 {Opt_volume, "volume=%u"},
473 {Opt_partition, "partition=%u"},
474 {Opt_fileset, "fileset=%u"},
475 {Opt_rootdir, "rootdir=%u"},
476 {Opt_utf8, "utf8"},
477 {Opt_iocharset, "iocharset=%s"},
7ac9bcd5
MS		 478 {Opt_fmode, "mode=%o"},
479 {Opt_dmode, "dmode=%o"},
28de7948 480 {Opt_err, NULL}
1da177e4
LT		 481};
482
6da80894
MS		 483static int udf_parse_options(char *options, struct udf_options *uopt,
484 bool remount)
1da177e4
LT		 485{
486 char *p;
487 int option;
488
489 uopt->novrs = 0;
1da177e4
LT		 490 uopt->partition = 0xFFFF;
491 uopt->session = 0xFFFFFFFF;
492 uopt->lastblock = 0;
493 uopt->anchor = 0;
494 uopt->volume = 0xFFFFFFFF;
495 uopt->rootdir = 0xFFFFFFFF;
496 uopt->fileset = 0xFFFFFFFF;
497 uopt->nls_map = NULL;
498
499 if (!options)
500 return 1;
501
cb00ea35 502 while ((p = strsep(&options, ",")) != NULL) {
1da177e4
LT		 503 substring_t args[MAX_OPT_ARGS];
504 int token;
8c6915ae 505 unsigned n;
1da177e4
LT		 506 if (!*p)
507 continue;
508
509 token = match_token(p, tokens, args);
cb00ea35
CG		 510 switch (token) {
511 case Opt_novrs:
512 uopt->novrs = 1;
4136801a 513 break;
cb00ea35
CG		 514 case Opt_bs:
515 if (match_int(&args[0], &option))
516 return 0;
8c6915ae
FF		 517 n = option;
518 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
519 return 0;
520 uopt->blocksize = n;
1197e4df 521 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
cb00ea35
CG		 522 break;
523 case Opt_unhide:
524 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
525 break;
526 case Opt_undelete:
527 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
528 break;
529 case Opt_noadinicb:
530 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
531 break;
532 case Opt_adinicb:
533 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
534 break;
535 case Opt_shortad:
536 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
537 break;
538 case Opt_longad:
539 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
540 break;
541 case Opt_gid:
542 if (match_int(args, &option))
543 return 0;
c2ba138a
EB		 544 uopt->gid = make_kgid(current_user_ns(), option);
545 if (!gid_valid(uopt->gid))
546 return 0;
ca76d2d8 547 uopt->flags |= (1 << UDF_FLAG_GID_SET);
cb00ea35
CG		 548 break;
549 case Opt_uid:
550 if (match_int(args, &option))
551 return 0;
c2ba138a
EB		 552 uopt->uid = make_kuid(current_user_ns(), option);
553 if (!uid_valid(uopt->uid))
554 return 0;
ca76d2d8 555 uopt->flags |= (1 << UDF_FLAG_UID_SET);
cb00ea35
CG		 556 break;
557 case Opt_umask:
558 if (match_octal(args, &option))
559 return 0;
560 uopt->umask = option;
561 break;
562 case Opt_nostrict:
563 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
564 break;
565 case Opt_session:
566 if (match_int(args, &option))
567 return 0;
568 uopt->session = option;
6da80894
MS		 569 if (!remount)
570 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
cb00ea35
CG		 571 break;
572 case Opt_lastblock:
573 if (match_int(args, &option))
574 return 0;
575 uopt->lastblock = option;
6da80894
MS		 576 if (!remount)
577 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
cb00ea35
CG		 578 break;
579 case Opt_anchor:
580 if (match_int(args, &option))
581 return 0;
582 uopt->anchor = option;
583 break;
584 case Opt_volume:
585 if (match_int(args, &option))
586 return 0;
587 uopt->volume = option;
588 break;
589 case Opt_partition:
590 if (match_int(args, &option))
591 return 0;
592 uopt->partition = option;
593 break;
594 case Opt_fileset:
595 if (match_int(args, &option))
596 return 0;
597 uopt->fileset = option;
598 break;
599 case Opt_rootdir:
600 if (match_int(args, &option))
601 return 0;
602 uopt->rootdir = option;
603 break;
604 case Opt_utf8:
605 uopt->flags |= (1 << UDF_FLAG_UTF8);
606 break;
1da177e4 607#ifdef CONFIG_UDF_NLS
cb00ea35
CG		 608 case Opt_iocharset:
609 uopt->nls_map = load_nls(args[0].from);
610 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
611 break;
1da177e4 612#endif
cb00ea35
CG		 613 case Opt_uignore:
614 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
615 break;
616 case Opt_uforget:
617 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
618 break;
619 case Opt_gignore:
620 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
621 break;
622 case Opt_gforget:
623 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
624 break;
7ac9bcd5
MS		 625 case Opt_fmode:
626 if (match_octal(args, &option))
627 return 0;
628 uopt->fmode = option & 0777;
629 break;
630 case Opt_dmode:
631 if (match_octal(args, &option))
632 return 0;
633 uopt->dmode = option & 0777;
634 break;
cb00ea35 635 default:
78ace70c 636 pr_err("bad mount option \"%s\" or missing value\n", p);
1da177e4
LT		 637 return 0;
638 }
639 }
640 return 1;
641}
642
cb00ea35 643static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
1da177e4
LT		 644{
645 struct udf_options uopt;
6c79e987 646 struct udf_sb_info *sbi = UDF_SB(sb);
c79d967d 647 int error = 0;
69d75671 648 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
1da177e4 649
02b9984d 650 sync_filesystem(sb);
69d75671
JK		 651 if (lvidiu) {
652 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
1751e8a6 653 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & SB_RDONLY))
e729eac6
JK		 654 return -EACCES;
655 }
656
6c79e987
MS		 657 uopt.flags = sbi->s_flags;
658 uopt.uid = sbi->s_uid;
659 uopt.gid = sbi->s_gid;
660 uopt.umask = sbi->s_umask;
7ac9bcd5
MS		 661 uopt.fmode = sbi->s_fmode;
662 uopt.dmode = sbi->s_dmode;
1da177e4 663
6da80894 664 if (!udf_parse_options(options, &uopt, true))
1da177e4
LT		 665 return -EINVAL;
666
c03cad24 667 write_lock(&sbi->s_cred_lock);
6c79e987
MS		 668 sbi->s_flags = uopt.flags;
669 sbi->s_uid = uopt.uid;
670 sbi->s_gid = uopt.gid;
671 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 672 sbi->s_fmode = uopt.fmode;
673 sbi->s_dmode = uopt.dmode;
c03cad24 674 write_unlock(&sbi->s_cred_lock);
1da177e4 675
1751e8a6 676 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
c79d967d
CH		 677 goto out_unlock;
678
1751e8a6 679 if (*flags & SB_RDONLY)
1da177e4 680 udf_close_lvid(sb);
36350462 681 else
1da177e4
LT		 682 udf_open_lvid(sb);
683
c79d967d 684out_unlock:
c79d967d 685 return error;
1da177e4
LT		 686}
687
40346005
JK		 688/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
689/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
690static loff_t udf_check_vsd(struct super_block *sb)
1da177e4
LT		 691{
692 struct volStructDesc *vsd = NULL;
44499602 693 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
1da177e4
LT		 694 int sectorsize;
695 struct buffer_head *bh = NULL;
cb00ea35
CG		 696 int nsr02 = 0;
697 int nsr03 = 0;
6c79e987 698 struct udf_sb_info *sbi;
1da177e4 699
6c79e987 700 sbi = UDF_SB(sb);
1da177e4
LT		 701 if (sb->s_blocksize < sizeof(struct volStructDesc))
702 sectorsize = sizeof(struct volStructDesc);
703 else
704 sectorsize = sb->s_blocksize;
705
abdc0eb0 706 sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);
1da177e4 707
fcbf7637 708 udf_debug("Starting at sector %u (%lu byte sectors)\n",
706047a7
SM		 709 (unsigned int)(sector >> sb->s_blocksize_bits),
710 sb->s_blocksize);
44499602
PF		 711 /* Process the sequence (if applicable). The hard limit on the sector
712 * offset is arbitrary, hopefully large enough so that all valid UDF
713 * filesystems will be recognised. There is no mention of an upper
714 * bound to the size of the volume recognition area in the standard.
715 * The limit will prevent the code to read all the sectors of a
716 * specially crafted image (like a bluray disc full of CD001 sectors),
717 * potentially causing minutes or even hours of uninterruptible I/O
718 * activity. This actually happened with uninitialised SSD partitions
719 * (all 0xFF) before the check for the limit and all valid IDs were
720 * added */
721 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
722 sector += sectorsize) {
1da177e4
LT		 723 /* Read a block */
724 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
725 if (!bh)
726 break;
727
728 /* Look for ISO descriptors */
729 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 730 (sector & (sb->s_blocksize - 1)));
1da177e4 731
44499602 732 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
3a71fc5d 733 VSD_STD_ID_LEN)) {
cb00ea35
CG		 734 switch (vsd->structType) {
735 case 0:
736 udf_debug("ISO9660 Boot Record found\n");
737 break;
738 case 1:
a983f368 739 udf_debug("ISO9660 Primary Volume Descriptor found\n");
cb00ea35
CG		 740 break;
741 case 2:
a983f368 742 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
cb00ea35
CG		 743 break;
744 case 3:
a983f368 745 udf_debug("ISO9660 Volume Partition Descriptor found\n");
cb00ea35
CG		 746 break;
747 case 255:
a983f368 748 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
cb00ea35
CG		 749 break;
750 default:
751 udf_debug("ISO9660 VRS (%u) found\n",
752 vsd->structType);
753 break;
1da177e4 754 }
3a71fc5d
MS		 755 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
756 VSD_STD_ID_LEN))
757 ; /* nothing */
758 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
759 VSD_STD_ID_LEN)) {
3bf25cb4 760 brelse(bh);
1da177e4 761 break;
3a71fc5d
MS		 762 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
763 VSD_STD_ID_LEN))
1da177e4 764 nsr02 = sector;
3a71fc5d
MS		 765 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
766 VSD_STD_ID_LEN))
1da177e4 767 nsr03 = sector;
44499602
PF		 768 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
769 VSD_STD_ID_LEN))
770 ; /* nothing */
771 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
772 VSD_STD_ID_LEN))
773 ; /* nothing */
774 else {
775 /* invalid id : end of volume recognition area */
776 brelse(bh);
777 break;
778 }
3bf25cb4 779 brelse(bh);
1da177e4
LT		 780 }
781
782 if (nsr03)
783 return nsr03;
784 else if (nsr02)
785 return nsr02;
44499602
PF		 786 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
787 VSD_FIRST_SECTOR_OFFSET)
1da177e4
LT		 788 return -1;
789 else
790 return 0;
791}
792
3a71fc5d 793static int udf_find_fileset(struct super_block *sb,
5ca4e4be
PE		 794 struct kernel_lb_addr *fileset,
795 struct kernel_lb_addr *root)
1da177e4
LT		 796{
797 struct buffer_head *bh = NULL;
798 long lastblock;
799 uint16_t ident;
6c79e987 800 struct udf_sb_info *sbi;
1da177e4
LT		 801
802 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 803 fileset->partitionReferenceNum != 0xFFFF) {
97e961fd 804 bh = udf_read_ptagged(sb, fileset, 0, &ident);
1da177e4 805
28de7948 806 if (!bh) {
1da177e4 807 return 1;
28de7948 808 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 809 brelse(bh);
1da177e4
LT		 810 return 1;
811 }
cb00ea35 812
1da177e4
LT		 813 }
814
6c79e987 815 sbi = UDF_SB(sb);
3a71fc5d
MS		 816 if (!bh) {
817 /* Search backwards through the partitions */
5ca4e4be 818 struct kernel_lb_addr newfileset;
1da177e4 819
28de7948 820/* --> cvg: FIXME - is it reasonable? */
1da177e4 821 return 1;
cb00ea35 822
6c79e987 823 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 824 (newfileset.partitionReferenceNum != 0xFFFF &&
825 fileset->logicalBlockNum == 0xFFFFFFFF &&
826 fileset->partitionReferenceNum == 0xFFFF);
827 newfileset.partitionReferenceNum--) {
6c79e987
MS		 828 lastblock = sbi->s_partmaps
829 [newfileset.partitionReferenceNum]
830 .s_partition_len;
1da177e4
LT		 831 newfileset.logicalBlockNum = 0;
832
cb00ea35 833 do {
97e961fd 834 bh = udf_read_ptagged(sb, &newfileset, 0,
3a71fc5d 835 &ident);
cb00ea35
CG		 836 if (!bh) {
837 newfileset.logicalBlockNum++;
1da177e4
LT		 838 continue;
839 }
840
cb00ea35
CG		 841 switch (ident) {
842 case TAG_IDENT_SBD:
28de7948
CG		 843 {
844 struct spaceBitmapDesc *sp;
4b11111a
MS		 845 sp = (struct spaceBitmapDesc *)
846 bh->b_data;
28de7948
CG		 847 newfileset.logicalBlockNum += 1 +
848 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 849 sizeof(struct spaceBitmapDesc)
850 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 851 brelse(bh);
852 break;
853 }
cb00ea35 854 case TAG_IDENT_FSD:
28de7948
CG		 855 *fileset = newfileset;
856 break;
cb00ea35 857 default:
28de7948
CG		 858 newfileset.logicalBlockNum++;
859 brelse(bh);
860 bh = NULL;
861 break;
1da177e4 862 }
28de7948
CG		 863 } while (newfileset.logicalBlockNum < lastblock &&
864 fileset->logicalBlockNum == 0xFFFFFFFF &&
865 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 866 }
867 }
868
869 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 870 fileset->partitionReferenceNum != 0xFFFF) && bh) {
fcbf7637 871 udf_debug("Fileset at block=%u, partition=%u\n",
cb00ea35
CG		 872 fileset->logicalBlockNum,
873 fileset->partitionReferenceNum);
1da177e4 874
6c79e987 875 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 876 udf_load_fileset(sb, bh, root);
3bf25cb4 877 brelse(bh);
1da177e4
LT		 878 return 0;
879 }
880 return 1;
881}
882
d759bfa4
JK		 883/*
884 * Load primary Volume Descriptor Sequence
885 *
886 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
887 * should be tried.
888 */
c0eb31ed 889static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 890{
891 struct primaryVolDesc *pvoldesc;
9293fcfb 892 uint8_t *outstr;
c0eb31ed
JK		 893 struct buffer_head *bh;
894 uint16_t ident;
d759bfa4 895 int ret = -ENOMEM;
ba9aadd8 896
9293fcfb 897 outstr = kmalloc(128, GFP_NOFS);
ba9aadd8 898 if (!outstr)
9293fcfb 899 return -ENOMEM;
c0eb31ed
JK		 900
901 bh = udf_read_tagged(sb, block, block, &ident);
d759bfa4
JK		 902 if (!bh) {
903 ret = -EAGAIN;
ba9aadd8 904 goto out2;
d759bfa4 905 }
ba9aadd8 906
d759bfa4
JK		 907 if (ident != TAG_IDENT_PVD) {
908 ret = -EIO;
909 goto out_bh;
910 }
1da177e4
LT		 911
912 pvoldesc = (struct primaryVolDesc *)bh->b_data;
913
56774805
MS		 914 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
915 pvoldesc->recordingDateAndTime)) {
af15a298 916#ifdef UDFFS_DEBUG
5ca4e4be 917 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
a983f368 918 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
af15a298
MS		 919 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
920 ts->minute, le16_to_cpu(ts->typeAndTimezone));
921#endif
1da177e4
LT		 922 }
923
c26f6c61 924 ret = udf_dstrCS0toUTF8(outstr, 31, pvoldesc->volIdent, 32);
9293fcfb
AG		 925 if (ret < 0)
926 goto out_bh;
e9d4cf41 927
9293fcfb
AG		 928 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
929 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
1da177e4 930
c26f6c61 931 ret = udf_dstrCS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128);
9293fcfb
AG		 932 if (ret < 0)
933 goto out_bh;
e9d4cf41 934
9293fcfb
AG		 935 outstr[ret] = 0;
936 udf_debug("volSetIdent[] = '%s'\n", outstr);
c0eb31ed 937
ba9aadd8 938 ret = 0;
d759bfa4
JK		 939out_bh:
940 brelse(bh);
ba9aadd8
MS		 941out2:
942 kfree(outstr);
ba9aadd8 943 return ret;
1da177e4
LT		 944}
945
3080a74e 946struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
7888824b 947 u32 meta_file_loc, u32 partition_ref)
3080a74e
NJ		 948{
949 struct kernel_lb_addr addr;
950 struct inode *metadata_fe;
951
952 addr.logicalBlockNum = meta_file_loc;
7888824b 953 addr.partitionReferenceNum = partition_ref;
3080a74e 954
6174c2eb 955 metadata_fe = udf_iget_special(sb, &addr);
3080a74e 956
6d3d5e86 957 if (IS_ERR(metadata_fe)) {
3080a74e 958 udf_warn(sb, "metadata inode efe not found\n");
6d3d5e86
JK		 959 return metadata_fe;
960 }
961 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
3080a74e
NJ		 962 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
963 iput(metadata_fe);
6d3d5e86 964 return ERR_PTR(-EIO);
3080a74e
NJ		 965 }
966
967 return metadata_fe;
968}
969
7888824b
AT		 970static int udf_load_metadata_files(struct super_block *sb, int partition,
971 int type1_index)
bfb257a5
JK		 972{
973 struct udf_sb_info *sbi = UDF_SB(sb);
974 struct udf_part_map *map;
975 struct udf_meta_data *mdata;
5ca4e4be 976 struct kernel_lb_addr addr;
6d3d5e86 977 struct inode *fe;
bfb257a5
JK		 978
979 map = &sbi->s_partmaps[partition];
980 mdata = &map->s_type_specific.s_metadata;
7888824b 981 mdata->s_phys_partition_ref = type1_index;
bfb257a5
JK		 982
983 /* metadata address */
fcbf7637 984 udf_debug("Metadata file location: block = %u part = %u\n",
7888824b 985 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
bfb257a5 986
6d3d5e86 987 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
7888824b 988 mdata->s_phys_partition_ref);
6d3d5e86 989 if (IS_ERR(fe)) {
3080a74e 990 /* mirror file entry */
fcbf7637 991 udf_debug("Mirror metadata file location: block = %u part = %u\n",
7888824b 992 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
bfb257a5 993
6d3d5e86 994 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
7888824b 995 mdata->s_phys_partition_ref);
bfb257a5 996
6d3d5e86 997 if (IS_ERR(fe)) {
3080a74e 998 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
6d3d5e86 999 return PTR_ERR(fe);
3080a74e 1000 }
6d3d5e86
JK		 1001 mdata->s_mirror_fe = fe;
1002 } else
1003 mdata->s_metadata_fe = fe;
1004
bfb257a5
JK		 1005
1006 /*
1007 * bitmap file entry
1008 * Note:
1009 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1010 */
1011 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1012 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
7888824b 1013 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
bfb257a5 1014
fcbf7637 1015 udf_debug("Bitmap file location: block = %u part = %u\n",
a983f368 1016 addr.logicalBlockNum, addr.partitionReferenceNum);
bfb257a5 1017
6174c2eb 1018 fe = udf_iget_special(sb, &addr);
6d3d5e86 1019 if (IS_ERR(fe)) {
bc98a42c 1020 if (sb_rdonly(sb))
a40ecd7b 1021 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
bfb257a5 1022 else {
8076c363 1023 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
6d3d5e86 1024 return PTR_ERR(fe);
bfb257a5 1025 }
6d3d5e86
JK		 1026 } else
1027 mdata->s_bitmap_fe = fe;
bfb257a5
JK		 1028 }
1029
1030 udf_debug("udf_load_metadata_files Ok\n");
bfb257a5 1031 return 0;
bfb257a5
JK		 1032}
1033
28de7948 1034static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
5ca4e4be 1035 struct kernel_lb_addr *root)
1da177e4
LT		 1036{
1037 struct fileSetDesc *fset;
1038
1039 fset = (struct fileSetDesc *)bh->b_data;
1040
1041 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1042
6c79e987 1043 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 1044
fcbf7637 1045 udf_debug("Rootdir at block=%u, partition=%u\n",
cb00ea35 1046 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 1047}
1048
883cb9d1
MS		 1049int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1050{
1051 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 1052 return DIV_ROUND_UP(map->s_partition_len +
1053 (sizeof(struct spaceBitmapDesc) << 3),
1054 sb->s_blocksize * 8);
883cb9d1
MS		 1055}
1056
66e1da3f
MS		 1057static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1058{
66e1da3f
MS		 1059 struct udf_bitmap *bitmap;
1060 int nr_groups;
1061 int size;
1062
883cb9d1 1063 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 1064 size = sizeof(struct udf_bitmap) +
1065 (sizeof(struct buffer_head *) * nr_groups);
1066
1067 if (size <= PAGE_SIZE)
ed2ae6f6 1068 bitmap = kzalloc(size, GFP_KERNEL);
66e1da3f 1069 else
ed2ae6f6 1070 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
66e1da3f 1071
ba2eb866 1072 if (!bitmap)
66e1da3f 1073 return NULL;
66e1da3f 1074
66e1da3f
MS		 1075 bitmap->s_nr_groups = nr_groups;
1076 return bitmap;
1077}
1078
3fb38dfa
JK		 1079static int udf_fill_partdesc_info(struct super_block *sb,
1080 struct partitionDesc *p, int p_index)
1da177e4 1081{
6c79e987 1082 struct udf_part_map *map;
165923fa 1083 struct udf_sb_info *sbi = UDF_SB(sb);
3fb38dfa 1084 struct partitionHeaderDesc *phd;
165923fa 1085
3fb38dfa 1086 map = &sbi->s_partmaps[p_index];
165923fa
MS		 1087
1088 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1089 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1090
1091 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1092 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1093 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1094 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1095 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1096 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1097 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1098 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1099
fcbf7637 1100 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
a983f368
JP		 1101 p_index, map->s_partition_type,
1102 map->s_partition_root, map->s_partition_len);
165923fa
MS		 1103
1104 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1105 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
3fb38dfa 1106 return 0;
165923fa
MS		 1107
1108 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1109 if (phd->unallocSpaceTable.extLength) {
5ca4e4be 1110 struct kernel_lb_addr loc = {
165923fa
MS		 1111 .logicalBlockNum = le32_to_cpu(
1112 phd->unallocSpaceTable.extPosition),
3fb38dfa 1113 .partitionReferenceNum = p_index,
165923fa 1114 };
6d3d5e86 1115 struct inode *inode;
165923fa 1116
6174c2eb 1117 inode = udf_iget_special(sb, &loc);
6d3d5e86 1118 if (IS_ERR(inode)) {
165923fa 1119 udf_debug("cannot load unallocSpaceTable (part %d)\n",
a983f368 1120 p_index);
6d3d5e86 1121 return PTR_ERR(inode);
165923fa 1122 }
6d3d5e86 1123 map->s_uspace.s_table = inode;
165923fa 1124 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
fcbf7637 1125 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
a983f368 1126 p_index, map->s_uspace.s_table->i_ino);
165923fa
MS		 1127 }
1128
1129 if (phd->unallocSpaceBitmap.extLength) {
3fb38dfa
JK		 1130 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1131 if (!bitmap)
d759bfa4 1132 return -ENOMEM;
165923fa 1133 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1134 bitmap->s_extPosition = le32_to_cpu(
165923fa 1135 phd->unallocSpaceBitmap.extPosition);
2e0838fd 1136 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
fcbf7637 1137 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
a983f368 1138 p_index, bitmap->s_extPosition);
165923fa
MS		 1139 }
1140
1141 if (phd->partitionIntegrityTable.extLength)
3fb38dfa 1142 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
165923fa
MS		 1143
1144 if (phd->freedSpaceTable.extLength) {
5ca4e4be 1145 struct kernel_lb_addr loc = {
165923fa
MS		 1146 .logicalBlockNum = le32_to_cpu(
1147 phd->freedSpaceTable.extPosition),
3fb38dfa 1148 .partitionReferenceNum = p_index,
165923fa 1149 };
6d3d5e86 1150 struct inode *inode;
165923fa 1151
6174c2eb 1152 inode = udf_iget_special(sb, &loc);
6d3d5e86 1153 if (IS_ERR(inode)) {
3fb38dfa 1154 udf_debug("cannot load freedSpaceTable (part %d)\n",
a983f368 1155 p_index);
6d3d5e86 1156 return PTR_ERR(inode);
165923fa 1157 }
6d3d5e86 1158 map->s_fspace.s_table = inode;
165923fa 1159 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
fcbf7637 1160 udf_debug("freedSpaceTable (part %d) @ %lu\n",
a983f368 1161 p_index, map->s_fspace.s_table->i_ino);
165923fa
MS		 1162 }
1163
1164 if (phd->freedSpaceBitmap.extLength) {
3fb38dfa
JK		 1165 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1166 if (!bitmap)
d759bfa4 1167 return -ENOMEM;
165923fa 1168 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1169 bitmap->s_extPosition = le32_to_cpu(
165923fa 1170 phd->freedSpaceBitmap.extPosition);
2e0838fd 1171 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
fcbf7637 1172 udf_debug("freedSpaceBitmap (part %d) @ %u\n",
a983f368 1173 p_index, bitmap->s_extPosition);
165923fa 1174 }
3fb38dfa
JK		 1175 return 0;
1176}
1177
e971b0b9
JK		 1178static void udf_find_vat_block(struct super_block *sb, int p_index,
1179 int type1_index, sector_t start_block)
38b74a53
JK		 1180{
1181 struct udf_sb_info *sbi = UDF_SB(sb);
1182 struct udf_part_map *map = &sbi->s_partmaps[p_index];
e971b0b9 1183 sector_t vat_block;
5ca4e4be 1184 struct kernel_lb_addr ino;
6d3d5e86 1185 struct inode *inode;
e971b0b9
JK		 1186
1187 /*
1188 * VAT file entry is in the last recorded block. Some broken disks have
1189 * it a few blocks before so try a bit harder...
1190 */
1191 ino.partitionReferenceNum = type1_index;
1192 for (vat_block = start_block;
1193 vat_block >= map->s_partition_root &&
6d3d5e86 1194 vat_block >= start_block - 3; vat_block--) {
e971b0b9 1195 ino.logicalBlockNum = vat_block - map->s_partition_root;
6174c2eb 1196 inode = udf_iget_special(sb, &ino);
6d3d5e86
JK		 1197 if (!IS_ERR(inode)) {
1198 sbi->s_vat_inode = inode;
1199 break;
1200 }
e971b0b9
JK		 1201 }
1202}
1203
1204static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1205{
1206 struct udf_sb_info *sbi = UDF_SB(sb);
1207 struct udf_part_map *map = &sbi->s_partmaps[p_index];
fa5e0815
JK		 1208 struct buffer_head *bh = NULL;
1209 struct udf_inode_info *vati;
1210 uint32_t pos;
1211 struct virtualAllocationTable20 *vat20;
23bcda11
FF		 1212 sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1213 sb->s_blocksize_bits;
38b74a53 1214
e971b0b9 1215 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
4bf17af0
JK		 1216 if (!sbi->s_vat_inode &&
1217 sbi->s_last_block != blocks - 1) {
78ace70c
JP		 1218 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1219 (unsigned long)sbi->s_last_block,
1220 (unsigned long)blocks - 1);
e971b0b9 1221 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
4bf17af0 1222 }
38b74a53 1223 if (!sbi->s_vat_inode)
d759bfa4 1224 return -EIO;
38b74a53
JK		 1225
1226 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1227 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1228 map->s_type_specific.s_virtual.s_num_entries =
1229 (sbi->s_vat_inode->i_size - 36) >> 2;
1230 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1231 vati = UDF_I(sbi->s_vat_inode);
1232 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1233 pos = udf_block_map(sbi->s_vat_inode, 0);
1234 bh = sb_bread(sb, pos);
1235 if (!bh)
d759bfa4 1236 return -EIO;
fa5e0815
JK		 1237 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1238 } else {
1239 vat20 = (struct virtualAllocationTable20 *)
1240 vati->i_ext.i_data;
1241 }
38b74a53 1242
38b74a53 1243 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1244 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1245 map->s_type_specific.s_virtual.s_num_entries =
1246 (sbi->s_vat_inode->i_size -
1247 map->s_type_specific.s_virtual.
1248 s_start_offset) >> 2;
1249 brelse(bh);
1250 }
1251 return 0;
1252}
1253
d759bfa4
JK		 1254/*
1255 * Load partition descriptor block
1256 *
1257 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1258 * sequence.
1259 */
3fb38dfa
JK		 1260static int udf_load_partdesc(struct super_block *sb, sector_t block)
1261{
1262 struct buffer_head *bh;
1263 struct partitionDesc *p;
1264 struct udf_part_map *map;
1265 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1266 int i, type1_idx;
3fb38dfa
JK		 1267 uint16_t partitionNumber;
1268 uint16_t ident;
d759bfa4 1269 int ret;
3fb38dfa
JK		 1270
1271 bh = udf_read_tagged(sb, block, block, &ident);
1272 if (!bh)
d759bfa4
JK		 1273 return -EAGAIN;
1274 if (ident != TAG_IDENT_PD) {
1275 ret = 0;
3fb38dfa 1276 goto out_bh;
d759bfa4 1277 }
3fb38dfa
JK		 1278
1279 p = (struct partitionDesc *)bh->b_data;
1280 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1281
7888824b 1282 /* First scan for TYPE1 and SPARABLE partitions */
3fb38dfa
JK		 1283 for (i = 0; i < sbi->s_partitions; i++) {
1284 map = &sbi->s_partmaps[i];
fcbf7637 1285 udf_debug("Searching map: (%u == %u)\n",
3fb38dfa 1286 map->s_partition_num, partitionNumber);
38b74a53
JK		 1287 if (map->s_partition_num == partitionNumber &&
1288 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1289 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1290 break;
1291 }
1292
38b74a53 1293 if (i >= sbi->s_partitions) {
fcbf7637 1294 udf_debug("Partition (%u) not found in partition map\n",
3fb38dfa 1295 partitionNumber);
d759bfa4 1296 ret = 0;
3fb38dfa
JK		 1297 goto out_bh;
1298 }
165923fa 1299
3fb38dfa 1300 ret = udf_fill_partdesc_info(sb, p, i);
d759bfa4
JK		 1301 if (ret < 0)
1302 goto out_bh;
38b74a53
JK		 1303
1304 /*
bfb257a5
JK		 1305 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1306 * PHYSICAL partitions are already set up
38b74a53
JK		 1307 */
1308 type1_idx = i;
44499602
PF		 1309#ifdef UDFFS_DEBUG
1310 map = NULL; /* supress 'maybe used uninitialized' warning */
1311#endif
38b74a53
JK		 1312 for (i = 0; i < sbi->s_partitions; i++) {
1313 map = &sbi->s_partmaps[i];
1314
1315 if (map->s_partition_num == partitionNumber &&
1316 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1317 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1318 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1319 break;
1320 }
1321
d759bfa4
JK		 1322 if (i >= sbi->s_partitions) {
1323 ret = 0;
38b74a53 1324 goto out_bh;
d759bfa4 1325 }
38b74a53
JK		 1326
1327 ret = udf_fill_partdesc_info(sb, p, i);
d759bfa4 1328 if (ret < 0)
38b74a53
JK		 1329 goto out_bh;
1330
bfb257a5 1331 if (map->s_partition_type == UDF_METADATA_MAP25) {
7888824b 1332 ret = udf_load_metadata_files(sb, i, type1_idx);
d759bfa4 1333 if (ret < 0) {
78ace70c
JP		 1334 udf_err(sb, "error loading MetaData partition map %d\n",
1335 i);
bfb257a5
JK		 1336 goto out_bh;
1337 }
1338 } else {
e729eac6
JK		 1339 /*
1340 * If we have a partition with virtual map, we don't handle
1341 * writing to it (we overwrite blocks instead of relocating
1342 * them).
1343 */
bc98a42c 1344 if (!sb_rdonly(sb)) {
e729eac6
JK		 1345 ret = -EACCES;
1346 goto out_bh;
1347 }
bfb257a5 1348 ret = udf_load_vat(sb, i, type1_idx);
d759bfa4 1349 if (ret < 0)
bfb257a5 1350 goto out_bh;
bfb257a5 1351 }
d759bfa4 1352 ret = 0;
c0eb31ed 1353out_bh:
2e0838fd 1354 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1355 brelse(bh);
1356 return ret;
1da177e4
LT		 1357}
1358
1df2ae31
JK		 1359static int udf_load_sparable_map(struct super_block *sb,
1360 struct udf_part_map *map,
1361 struct sparablePartitionMap *spm)
1362{
1363 uint32_t loc;
1364 uint16_t ident;
1365 struct sparingTable *st;
1366 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1367 int i;
1368 struct buffer_head *bh;
1369
1370 map->s_partition_type = UDF_SPARABLE_MAP15;
1371 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1372 if (!is_power_of_2(sdata->s_packet_len)) {
1373 udf_err(sb, "error loading logical volume descriptor: "
1374 "Invalid packet length %u\n",
1375 (unsigned)sdata->s_packet_len);
1376 return -EIO;
1377 }
1378 if (spm->numSparingTables > 4) {
1379 udf_err(sb, "error loading logical volume descriptor: "
1380 "Too many sparing tables (%d)\n",
1381 (int)spm->numSparingTables);
1382 return -EIO;
1383 }
1384
1385 for (i = 0; i < spm->numSparingTables; i++) {
1386 loc = le32_to_cpu(spm->locSparingTable[i]);
1387 bh = udf_read_tagged(sb, loc, loc, &ident);
1388 if (!bh)
1389 continue;
1390
1391 st = (struct sparingTable *)bh->b_data;
1392 if (ident != 0 ||
1393 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1394 strlen(UDF_ID_SPARING)) ||
1395 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1396 sb->s_blocksize) {
1397 brelse(bh);
1398 continue;
1399 }
1400
1401 sdata->s_spar_map[i] = bh;
1402 }
1403 map->s_partition_func = udf_get_pblock_spar15;
1404 return 0;
1405}
1406
c0eb31ed 1407static int udf_load_logicalvol(struct super_block *sb, sector_t block,
5ca4e4be 1408 struct kernel_lb_addr *fileset)
1da177e4
LT		 1409{
1410 struct logicalVolDesc *lvd;
1df2ae31 1411 int i, offset;
1da177e4 1412 uint8_t type;
6c79e987 1413 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1414 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1415 uint16_t ident;
1416 struct buffer_head *bh;
adee11b2 1417 unsigned int table_len;
d759bfa4 1418 int ret;
1da177e4 1419
c0eb31ed
JK		 1420 bh = udf_read_tagged(sb, block, block, &ident);
1421 if (!bh)
d759bfa4 1422 return -EAGAIN;
c0eb31ed 1423 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4 1424 lvd = (struct logicalVolDesc *)bh->b_data;
adee11b2 1425 table_len = le32_to_cpu(lvd->mapTableLength);
57b9655d 1426 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
adee11b2
JK		 1427 udf_err(sb, "error loading logical volume descriptor: "
1428 "Partition table too long (%u > %lu)\n", table_len,
1429 sb->s_blocksize - sizeof(*lvd));
d759bfa4 1430 ret = -EIO;
adee11b2
JK		 1431 goto out_bh;
1432 }
1da177e4 1433
cb14d340
JK		 1434 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1435 if (ret)
c0eb31ed 1436 goto out_bh;
1da177e4 1437
cb00ea35 1438 for (i = 0, offset = 0;
adee11b2 1439 i < sbi->s_partitions && offset < table_len;
4b11111a
MS		 1440 i++, offset += gpm->partitionMapLength) {
1441 struct udf_part_map *map = &sbi->s_partmaps[i];
1442 gpm = (struct genericPartitionMap *)
1443 &(lvd->partitionMaps[offset]);
1444 type = gpm->partitionMapType;
cb00ea35 1445 if (type == 1) {
4b11111a
MS		 1446 struct genericPartitionMap1 *gpm1 =
1447 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1448 map->s_partition_type = UDF_TYPE1_MAP15;
1449 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1450 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1451 map->s_partition_func = NULL;
cb00ea35 1452 } else if (type == 2) {
4b11111a
MS		 1453 struct udfPartitionMap2 *upm2 =
1454 (struct udfPartitionMap2 *)gpm;
1455 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1456 strlen(UDF_ID_VIRTUAL))) {
1457 u16 suf =
1458 le16_to_cpu(((__le16 *)upm2->partIdent.
1459 identSuffix)[0]);
c82a1275 1460 if (suf < 0x0200) {
4b11111a
MS		 1461 map->s_partition_type =
1462 UDF_VIRTUAL_MAP15;
1463 map->s_partition_func =
1464 udf_get_pblock_virt15;
c82a1275 1465 } else {
4b11111a
MS		 1466 map->s_partition_type =
1467 UDF_VIRTUAL_MAP20;
1468 map->s_partition_func =
1469 udf_get_pblock_virt20;
1da177e4 1470 }
4b11111a
MS		 1471 } else if (!strncmp(upm2->partIdent.ident,
1472 UDF_ID_SPARABLE,
1473 strlen(UDF_ID_SPARABLE))) {
d759bfa4
JK		 1474 ret = udf_load_sparable_map(sb, map,
1475 (struct sparablePartitionMap *)gpm);
1476 if (ret < 0)
1df2ae31 1477 goto out_bh;
bfb257a5
JK		 1478 } else if (!strncmp(upm2->partIdent.ident,
1479 UDF_ID_METADATA,
1480 strlen(UDF_ID_METADATA))) {
1481 struct udf_meta_data *mdata =
1482 &map->s_type_specific.s_metadata;
1483 struct metadataPartitionMap *mdm =
1484 (struct metadataPartitionMap *)
1485 &(lvd->partitionMaps[offset]);
fcbf7637 1486 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
a983f368 1487 i, type, UDF_ID_METADATA);
bfb257a5
JK		 1488
1489 map->s_partition_type = UDF_METADATA_MAP25;
1490 map->s_partition_func = udf_get_pblock_meta25;
1491
1492 mdata->s_meta_file_loc =
1493 le32_to_cpu(mdm->metadataFileLoc);
1494 mdata->s_mirror_file_loc =
1495 le32_to_cpu(mdm->metadataMirrorFileLoc);
1496 mdata->s_bitmap_file_loc =
1497 le32_to_cpu(mdm->metadataBitmapFileLoc);
1498 mdata->s_alloc_unit_size =
1499 le32_to_cpu(mdm->allocUnitSize);
1500 mdata->s_align_unit_size =
1501 le16_to_cpu(mdm->alignUnitSize);
ed47a7d0
JK		 1502 if (mdm->flags & 0x01)
1503 mdata->s_flags |= MF_DUPLICATE_MD;
bfb257a5
JK		 1504
1505 udf_debug("Metadata Ident suffix=0x%x\n",
a983f368
JP		 1506 le16_to_cpu(*(__le16 *)
1507 mdm->partIdent.identSuffix));
fcbf7637 1508 udf_debug("Metadata part num=%u\n",
a983f368 1509 le16_to_cpu(mdm->partitionNum));
fcbf7637 1510 udf_debug("Metadata part alloc unit size=%u\n",
a983f368 1511 le32_to_cpu(mdm->allocUnitSize));
fcbf7637 1512 udf_debug("Metadata file loc=%u\n",
a983f368 1513 le32_to_cpu(mdm->metadataFileLoc));
fcbf7637 1514 udf_debug("Mirror file loc=%u\n",
a983f368 1515 le32_to_cpu(mdm->metadataMirrorFileLoc));
fcbf7637 1516 udf_debug("Bitmap file loc=%u\n",
a983f368 1517 le32_to_cpu(mdm->metadataBitmapFileLoc));
fcbf7637 1518 udf_debug("Flags: %d %u\n",
ed47a7d0 1519 mdata->s_flags, mdm->flags);
cb00ea35 1520 } else {
3a71fc5d
MS		 1521 udf_debug("Unknown ident: %s\n",
1522 upm2->partIdent.ident);
1da177e4
LT		 1523 continue;
1524 }
6c79e987
MS		 1525 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1526 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4 1527 }
fcbf7637 1528 udf_debug("Partition (%d:%u) type %u on volume %u\n",
a983f368 1529 i, map->s_partition_num, type, map->s_volumeseqnum);
1da177e4
LT		 1530 }
1531
cb00ea35 1532 if (fileset) {
5ca4e4be 1533 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1534
1535 *fileset = lelb_to_cpu(la->extLocation);
fcbf7637 1536 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
a983f368 1537 fileset->logicalBlockNum,
28de7948 1538 fileset->partitionReferenceNum);
1da177e4
LT		 1539 }
1540 if (lvd->integritySeqExt.extLength)
1541 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
d759bfa4 1542 ret = 0;
c0eb31ed
JK		 1543out_bh:
1544 brelse(bh);
1545 return ret;
1da177e4
LT		 1546}
1547
1548/*
a47241cd 1549 * Find the prevailing Logical Volume Integrity Descriptor.
1da177e4 1550 */
5ca4e4be 1551static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1da177e4 1552{
a47241cd 1553 struct buffer_head *bh, *final_bh;
1da177e4 1554 uint16_t ident;
6c79e987
MS		 1555 struct udf_sb_info *sbi = UDF_SB(sb);
1556 struct logicalVolIntegrityDesc *lvid;
a47241cd
AT		 1557 int indirections = 0;
1558
1559 while (++indirections <= UDF_MAX_LVID_NESTING) {
1560 final_bh = NULL;
1561 while (loc.extLength > 0 &&
1562 (bh = udf_read_tagged(sb, loc.extLocation,
1563 loc.extLocation, &ident))) {
1564 if (ident != TAG_IDENT_LVID) {
1565 brelse(bh);
1566 break;
1567 }
1568
1569 brelse(final_bh);
1570 final_bh = bh;
1da177e4 1571
a47241cd
AT		 1572 loc.extLength -= sb->s_blocksize;
1573 loc.extLocation++;
1574 }
cb00ea35 1575
a47241cd
AT		 1576 if (!final_bh)
1577 return;
cb00ea35 1578
a47241cd
AT		 1579 brelse(sbi->s_lvid_bh);
1580 sbi->s_lvid_bh = final_bh;
1581
1582 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1583 if (lvid->nextIntegrityExt.extLength == 0)
1584 return;
1585
1586 loc = leea_to_cpu(lvid->nextIntegrityExt);
1da177e4 1587 }
a47241cd
AT		 1588
1589 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1590 UDF_MAX_LVID_NESTING);
1591 brelse(sbi->s_lvid_bh);
1592 sbi->s_lvid_bh = NULL;
1da177e4
LT		 1593}
1594
e7a4eb86 1595
1da177e4 1596/*
d759bfa4
JK		 1597 * Process a main/reserve volume descriptor sequence.
1598 * @block First block of first extent of the sequence.
1599 * @lastblock Lastblock of first extent of the sequence.
1600 * @fileset There we store extent containing root fileset
1da177e4 1601 *
d759bfa4
JK		 1602 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1603 * sequence
1da177e4 1604 */
d759bfa4
JK		 1605static noinline int udf_process_sequence(
1606 struct super_block *sb,
1607 sector_t block, sector_t lastblock,
1608 struct kernel_lb_addr *fileset)
1da177e4
LT		 1609{
1610 struct buffer_head *bh = NULL;
1611 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1612 struct udf_vds_record *curr;
1da177e4
LT		 1613 struct generic_desc *gd;
1614 struct volDescPtr *vdp;
2b8f9421 1615 bool done = false;
1da177e4
LT		 1616 uint32_t vdsn;
1617 uint16_t ident;
d759bfa4 1618 int ret;
e7a4eb86 1619 unsigned int indirections = 0;
1da177e4
LT		 1620
1621 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1622
c0eb31ed
JK		 1623 /*
1624 * Read the main descriptor sequence and find which descriptors
1625 * are in it.
1626 */
cb00ea35 1627 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1628
1629 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed 1630 if (!bh) {
78ace70c
JP		 1631 udf_err(sb,
1632 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1633 (unsigned long long)block);
d759bfa4 1634 return -EAGAIN;
c0eb31ed 1635 }
1da177e4
LT		 1636
1637 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1638 gd = (struct generic_desc *)bh->b_data;
1639 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1640 switch (ident) {
28de7948 1641 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1642 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1643 if (vdsn >= curr->volDescSeqNum) {
1644 curr->volDescSeqNum = vdsn;
1645 curr->block = block;
cb00ea35
CG		 1646 }
1647 break;
28de7948 1648 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
7b568cba
JK		 1649 if (++indirections > UDF_MAX_TD_NESTING) {
1650 udf_err(sb, "too many Volume Descriptor "
1651 "Pointers (max %u supported)\n",
1652 UDF_MAX_TD_NESTING);
1653 brelse(bh);
1654 return -EIO;
cb00ea35 1655 }
7b568cba
JK		 1656
1657 vdp = (struct volDescPtr *)bh->b_data;
1658 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1659 lastblock = le32_to_cpu(
1660 vdp->nextVolDescSeqExt.extLength) >>
1661 sb->s_blocksize_bits;
1662 lastblock += block - 1;
1663 /* For loop is going to increment 'block' again */
1664 block--;
cb00ea35 1665 break;
28de7948 1666 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1667 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1668 if (vdsn >= curr->volDescSeqNum) {
1669 curr->volDescSeqNum = vdsn;
1670 curr->block = block;
cb00ea35
CG		 1671 }
1672 break;
28de7948 1673 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1674 curr = &vds[VDS_POS_PARTITION_DESC];
1675 if (!curr->block)
1676 curr->block = block;
cb00ea35 1677 break;
28de7948 1678 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1679 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1680 if (vdsn >= curr->volDescSeqNum) {
1681 curr->volDescSeqNum = vdsn;
1682 curr->block = block;
cb00ea35
CG		 1683 }
1684 break;
28de7948 1685 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1686 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1687 if (vdsn >= curr->volDescSeqNum) {
1688 curr->volDescSeqNum = vdsn;
1689 curr->block = block;
cb00ea35
CG		 1690 }
1691 break;
28de7948 1692 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
cb00ea35 1693 vds[VDS_POS_TERMINATING_DESC].block = block;
7b568cba 1694 done = true;
cb00ea35 1695 break;
1da177e4 1696 }
3bf25cb4 1697 brelse(bh);
1da177e4 1698 }
c0eb31ed
JK		 1699 /*
1700 * Now read interesting descriptors again and process them
1701 * in a suitable order
1702 */
1703 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
78ace70c 1704 udf_err(sb, "Primary Volume Descriptor not found!\n");
d759bfa4
JK		 1705 return -EAGAIN;
1706 }
1707 ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1708 if (ret < 0)
1709 return ret;
1710
1711 if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1712 ret = udf_load_logicalvol(sb,
1713 vds[VDS_POS_LOGICAL_VOL_DESC].block,
1714 fileset);
1715 if (ret < 0)
1716 return ret;
c0eb31ed 1717 }
165923fa 1718
c0eb31ed
JK		 1719 if (vds[VDS_POS_PARTITION_DESC].block) {
1720 /*
1721 * We rescan the whole descriptor sequence to find
1722 * partition descriptor blocks and process them.
1723 */
1724 for (block = vds[VDS_POS_PARTITION_DESC].block;
1725 block < vds[VDS_POS_TERMINATING_DESC].block;
d759bfa4
JK		 1726 block++) {
1727 ret = udf_load_partdesc(sb, block);
1728 if (ret < 0)
1729 return ret;
1730 }
1da177e4
LT		 1731 }
1732
1733 return 0;
1734}
1735
d759bfa4
JK		 1736/*
1737 * Load Volume Descriptor Sequence described by anchor in bh
1738 *
1739 * Returns <0 on error, 0 on success
1740 */
40346005
JK		 1741static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1742 struct kernel_lb_addr *fileset)
1da177e4 1743{
40346005 1744 struct anchorVolDescPtr *anchor;
d759bfa4
JK		 1745 sector_t main_s, main_e, reserve_s, reserve_e;
1746 int ret;
1da177e4 1747
40346005
JK		 1748 anchor = (struct anchorVolDescPtr *)bh->b_data;
1749
1750 /* Locate the main sequence */
1751 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1752 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1753 main_e = main_e >> sb->s_blocksize_bits;
91c9c9ec 1754 main_e += main_s - 1;
40346005
JK		 1755
1756 /* Locate the reserve sequence */
1757 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1758 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1759 reserve_e = reserve_e >> sb->s_blocksize_bits;
91c9c9ec 1760 reserve_e += reserve_s - 1;
40346005
JK		 1761
1762 /* Process the main & reserve sequences */
1763 /* responsible for finding the PartitionDesc(s) */
d759bfa4
JK		 1764 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1765 if (ret != -EAGAIN)
1766 return ret;
bff943af 1767 udf_sb_free_partitions(sb);
d759bfa4
JK		 1768 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1769 if (ret < 0) {
1770 udf_sb_free_partitions(sb);
1771 /* No sequence was OK, return -EIO */
1772 if (ret == -EAGAIN)
1773 ret = -EIO;
1774 }
1775 return ret;
1da177e4
LT		 1776}
1777
40346005
JK		 1778/*
1779 * Check whether there is an anchor block in the given block and
1780 * load Volume Descriptor Sequence if so.
d759bfa4
JK		 1781 *
1782 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1783 * block
40346005
JK		 1784 */
1785static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1786 struct kernel_lb_addr *fileset)
1197e4df 1787{
40346005
JK		 1788 struct buffer_head *bh;
1789 uint16_t ident;
1790 int ret;
1197e4df 1791
40346005
JK		 1792 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1793 udf_fixed_to_variable(block) >=
23bcda11 1794 i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
d759bfa4 1795 return -EAGAIN;
40346005
JK		 1796
1797 bh = udf_read_tagged(sb, block, block, &ident);
1798 if (!bh)
d759bfa4 1799 return -EAGAIN;
40346005
JK		 1800 if (ident != TAG_IDENT_AVDP) {
1801 brelse(bh);
d759bfa4 1802 return -EAGAIN;
1197e4df 1803 }
40346005
JK		 1804 ret = udf_load_sequence(sb, bh, fileset);
1805 brelse(bh);
1806 return ret;
1197e4df
CL		 1807}
1808
d759bfa4
JK		 1809/*
1810 * Search for an anchor volume descriptor pointer.
1811 *
1812 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1813 * of anchors.
1814 */
1815static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1816 struct kernel_lb_addr *fileset)
1da177e4 1817{
40346005 1818 sector_t last[6];
38b74a53 1819 int i;
40346005
JK		 1820 struct udf_sb_info *sbi = UDF_SB(sb);
1821 int last_count = 0;
d759bfa4 1822 int ret;
1da177e4 1823
40346005
JK		 1824 /* First try user provided anchor */
1825 if (sbi->s_anchor) {
d759bfa4
JK		 1826 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1827 if (ret != -EAGAIN)
1828 return ret;
40346005
JK		 1829 }
1830 /*
1831 * according to spec, anchor is in either:
1832 * block 256
1833 * lastblock-256
1834 * lastblock
1835 * however, if the disc isn't closed, it could be 512.
1836 */
d759bfa4
JK		 1837 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1838 if (ret != -EAGAIN)
1839 return ret;
40346005
JK		 1840 /*
1841 * The trouble is which block is the last one. Drives often misreport
1842 * this so we try various possibilities.
1843 */
d759bfa4
JK		 1844 last[last_count++] = *lastblock;
1845 if (*lastblock >= 1)
1846 last[last_count++] = *lastblock - 1;
1847 last[last_count++] = *lastblock + 1;
1848 if (*lastblock >= 2)
1849 last[last_count++] = *lastblock - 2;
1850 if (*lastblock >= 150)
1851 last[last_count++] = *lastblock - 150;
1852 if (*lastblock >= 152)
1853 last[last_count++] = *lastblock - 152;
1da177e4 1854
40346005 1855 for (i = 0; i < last_count; i++) {
23bcda11 1856 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >>
40346005 1857 sb->s_blocksize_bits)
28f7c4d4 1858 continue;
d759bfa4
JK		 1859 ret = udf_check_anchor_block(sb, last[i], fileset);
1860 if (ret != -EAGAIN) {
1861 if (!ret)
1862 *lastblock = last[i];
1863 return ret;
1864 }
40346005 1865 if (last[i] < 256)
28f7c4d4 1866 continue;
d759bfa4
JK		 1867 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1868 if (ret != -EAGAIN) {
1869 if (!ret)
1870 *lastblock = last[i];
1871 return ret;
1872 }
40346005 1873 }
28f7c4d4 1874
40346005 1875 /* Finally try block 512 in case media is open */
d759bfa4 1876 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
40346005 1877}
28f7c4d4 1878
40346005
JK		 1879/*
1880 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1881 * area specified by it. The function expects sbi->s_lastblock to be the last
1882 * block on the media.
1883 *
d759bfa4
JK		 1884 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1885 * was not found.
40346005
JK		 1886 */
1887static int udf_find_anchor(struct super_block *sb,
1888 struct kernel_lb_addr *fileset)
1889{
40346005 1890 struct udf_sb_info *sbi = UDF_SB(sb);
d759bfa4
JK		 1891 sector_t lastblock = sbi->s_last_block;
1892 int ret;
28f7c4d4 1893
d759bfa4
JK		 1894 ret = udf_scan_anchors(sb, &lastblock, fileset);
1895 if (ret != -EAGAIN)
40346005 1896 goto out;
1da177e4 1897
40346005
JK		 1898 /* No anchor found? Try VARCONV conversion of block numbers */
1899 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
d759bfa4 1900 lastblock = udf_variable_to_fixed(sbi->s_last_block);
40346005 1901 /* Firstly, we try to not convert number of the last block */
d759bfa4
JK		 1902 ret = udf_scan_anchors(sb, &lastblock, fileset);
1903 if (ret != -EAGAIN)
40346005 1904 goto out;
1da177e4 1905
d759bfa4 1906 lastblock = sbi->s_last_block;
40346005 1907 /* Secondly, we try with converted number of the last block */
d759bfa4
JK		 1908 ret = udf_scan_anchors(sb, &lastblock, fileset);
1909 if (ret < 0) {
40346005
JK		 1910 /* VARCONV didn't help. Clear it. */
1911 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1da177e4 1912 }
40346005 1913out:
d759bfa4
JK		 1914 if (ret == 0)
1915 sbi->s_last_block = lastblock;
1916 return ret;
40346005 1917}
1da177e4 1918
40346005
JK		 1919/*
1920 * Check Volume Structure Descriptor, find Anchor block and load Volume
d759bfa4
JK		 1921 * Descriptor Sequence.
1922 *
1923 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1924 * block was not found.
40346005
JK		 1925 */
1926static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1927 int silent, struct kernel_lb_addr *fileset)
1928{
1929 struct udf_sb_info *sbi = UDF_SB(sb);
1930 loff_t nsr_off;
d759bfa4 1931 int ret;
40346005
JK		 1932
1933 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1934 if (!silent)
78ace70c 1935 udf_warn(sb, "Bad block size\n");
d759bfa4 1936 return -EINVAL;
40346005
JK		 1937 }
1938 sbi->s_last_block = uopt->lastblock;
1939 if (!uopt->novrs) {
1940 /* Check that it is NSR02 compliant */
1941 nsr_off = udf_check_vsd(sb);
1942 if (!nsr_off) {
1943 if (!silent)
78ace70c 1944 udf_warn(sb, "No VRS found\n");
70f16cef 1945 return -EINVAL;
40346005
JK		 1946 }
1947 if (nsr_off == -1)
44499602
PF		 1948 udf_debug("Failed to read sector at offset %d. "
1949 "Assuming open disc. Skipping validity "
1950 "check\n", VSD_FIRST_SECTOR_OFFSET);
40346005
JK		 1951 if (!sbi->s_last_block)
1952 sbi->s_last_block = udf_get_last_block(sb);
1953 } else {
1954 udf_debug("Validity check skipped because of novrs option\n");
28f7c4d4 1955 }
1da177e4 1956
40346005
JK		 1957 /* Look for anchor block and load Volume Descriptor Sequence */
1958 sbi->s_anchor = uopt->anchor;
d759bfa4
JK		 1959 ret = udf_find_anchor(sb, fileset);
1960 if (ret < 0) {
1961 if (!silent && ret == -EAGAIN)
78ace70c 1962 udf_warn(sb, "No anchor found\n");
d759bfa4 1963 return ret;
40346005 1964 }
d759bfa4 1965 return 0;
1da177e4
LT		 1966}
1967
1968static void udf_open_lvid(struct super_block *sb)
1969{
6c79e987
MS		 1970 struct udf_sb_info *sbi = UDF_SB(sb);
1971 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1972 struct logicalVolIntegrityDesc *lvid;
1973 struct logicalVolIntegrityDescImpUse *lvidiu;
88b50ce3 1974 struct timespec ts;
146bca72 1975
165923fa
MS		 1976 if (!bh)
1977 return;
165923fa 1978 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
69d75671
JK		 1979 lvidiu = udf_sb_lvidiu(sb);
1980 if (!lvidiu)
1981 return;
165923fa 1982
69d75671 1983 mutex_lock(&sbi->s_alloc_mutex);
165923fa
MS		 1984 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1985 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
88b50ce3
DD		 1986 ktime_get_real_ts(&ts);
1987 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
146bca72 1988 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
165923fa
MS		 1989
1990 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1991 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1992 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1993
1994 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1995 mark_buffer_dirty(bh);
146bca72 1996 sbi->s_lvid_dirty = 0;
949f4a7c 1997 mutex_unlock(&sbi->s_alloc_mutex);
9734c971
JK		 1998 /* Make opening of filesystem visible on the media immediately */
1999 sync_dirty_buffer(bh);
1da177e4
LT		 2000}
2001
2002static void udf_close_lvid(struct super_block *sb)
2003{
6c79e987
MS		 2004 struct udf_sb_info *sbi = UDF_SB(sb);
2005 struct buffer_head *bh = sbi->s_lvid_bh;
2006 struct logicalVolIntegrityDesc *lvid;
165923fa 2007 struct logicalVolIntegrityDescImpUse *lvidiu;
88b50ce3 2008 struct timespec ts;
28de7948 2009
6c79e987
MS		 2010 if (!bh)
2011 return;
69d75671
JK		 2012 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2013 lvidiu = udf_sb_lvidiu(sb);
2014 if (!lvidiu)
2015 return;
6c79e987 2016
949f4a7c 2017 mutex_lock(&sbi->s_alloc_mutex);
165923fa
MS		 2018 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2019 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
88b50ce3
DD		 2020 ktime_get_real_ts(&ts);
2021 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
165923fa
MS		 2022 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2023 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2024 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2025 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2026 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2027 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2028 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2029
2030 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 2031 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 2032 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 2033
2034 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
853a0c25
JK		 2035 /*
2036 * We set buffer uptodate unconditionally here to avoid spurious
2037 * warnings from mark_buffer_dirty() when previous EIO has marked
2038 * the buffer as !uptodate
2039 */
2040 set_buffer_uptodate(bh);
165923fa 2041 mark_buffer_dirty(bh);
146bca72 2042 sbi->s_lvid_dirty = 0;
949f4a7c 2043 mutex_unlock(&sbi->s_alloc_mutex);
9734c971
JK		 2044 /* Make closing of filesystem visible on the media immediately */
2045 sync_dirty_buffer(bh);
1da177e4
LT		 2046}
2047
d664b6af
JK		 2048u64 lvid_get_unique_id(struct super_block *sb)
2049{
2050 struct buffer_head *bh;
2051 struct udf_sb_info *sbi = UDF_SB(sb);
2052 struct logicalVolIntegrityDesc *lvid;
2053 struct logicalVolHeaderDesc *lvhd;
2054 u64 uniqueID;
2055 u64 ret;
2056
2057 bh = sbi->s_lvid_bh;
2058 if (!bh)
2059 return 0;
2060
2061 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2062 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2063
2064 mutex_lock(&sbi->s_alloc_mutex);
2065 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2066 if (!(++uniqueID & 0xFFFFFFFF))
2067 uniqueID += 16;
2068 lvhd->uniqueID = cpu_to_le64(uniqueID);
2069 mutex_unlock(&sbi->s_alloc_mutex);
2070 mark_buffer_dirty(bh);
2071
2072 return ret;
1da177e4
LT		 2073}
2074
1da177e4
LT		 2075static int udf_fill_super(struct super_block *sb, void *options, int silent)
2076{
d759bfa4 2077 int ret = -EINVAL;
cb00ea35 2078 struct inode *inode = NULL;
1da177e4 2079 struct udf_options uopt;
5ca4e4be 2080 struct kernel_lb_addr rootdir, fileset;
1da177e4 2081 struct udf_sb_info *sbi;
9181f8bf 2082 bool lvid_open = false;
1da177e4
LT		 2083
2084 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
c2ba138a
EB		 2085 uopt.uid = INVALID_UID;
2086 uopt.gid = INVALID_GID;
1da177e4 2087 uopt.umask = 0;
87bc730c
MS		 2088 uopt.fmode = UDF_INVALID_MODE;
2089 uopt.dmode = UDF_INVALID_MODE;
1da177e4 2090
033c9da0 2091 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
9db9f9e3 2092 if (!sbi)
1da177e4 2093 return -ENOMEM;
28de7948 2094
1da177e4 2095 sb->s_fs_info = sbi;
1da177e4 2096
1e7933de 2097 mutex_init(&sbi->s_alloc_mutex);
1da177e4 2098
6da80894 2099 if (!udf_parse_options((char *)options, &uopt, false))
fdf2657b 2100 goto parse_options_failure;
1da177e4
LT		 2101
2102 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 2103 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
8076c363 2104 udf_err(sb, "utf8 cannot be combined with iocharset\n");
fdf2657b 2105 goto parse_options_failure;
1da177e4
LT		 2106 }
2107#ifdef CONFIG_UDF_NLS
cb00ea35 2108 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 2109 uopt.nls_map = load_nls_default();
2110 if (!uopt.nls_map)
2111 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2112 else
2113 udf_debug("Using default NLS map\n");
2114 }
2115#endif
2116 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2117 uopt.flags |= (1 << UDF_FLAG_UTF8);
2118
2119 fileset.logicalBlockNum = 0xFFFFFFFF;
2120 fileset.partitionReferenceNum = 0xFFFF;
2121
6c79e987
MS		 2122 sbi->s_flags = uopt.flags;
2123 sbi->s_uid = uopt.uid;
2124 sbi->s_gid = uopt.gid;
2125 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 2126 sbi->s_fmode = uopt.fmode;
2127 sbi->s_dmode = uopt.dmode;
6c79e987 2128 sbi->s_nls_map = uopt.nls_map;
c03cad24 2129 rwlock_init(&sbi->s_cred_lock);
1da177e4 2130
cb00ea35 2131 if (uopt.session == 0xFFFFFFFF)
6c79e987 2132 sbi->s_session = udf_get_last_session(sb);
1da177e4 2133 else
6c79e987 2134 sbi->s_session = uopt.session;
1da177e4 2135
6c79e987 2136 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 2137
40346005
JK		 2138 /* Fill in the rest of the superblock */
2139 sb->s_op = &udf_sb_ops;
2140 sb->s_export_op = &udf_export_ops;
123e9caf 2141
40346005
JK		 2142 sb->s_magic = UDF_SUPER_MAGIC;
2143 sb->s_time_gran = 1000;
2144
1197e4df 2145 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
40346005 2146 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 2147 } else {
e1defc4f 2148 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
70f16cef 2149 while (uopt.blocksize <= 4096) {
40346005 2150 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
70f16cef
FF		 2151 if (ret < 0) {
2152 if (!silent && ret != -EACCES) {
fcbf7637 2153 pr_notice("Scanning with blocksize %u failed\n",
70f16cef
FF		 2154 uopt.blocksize);
2155 }
2156 brelse(sbi->s_lvid_bh);
2157 sbi->s_lvid_bh = NULL;
2158 /*
2159 * EACCES is special - we want to propagate to
2160 * upper layers that we cannot handle RW mount.
2161 */
2162 if (ret == -EACCES)
2163 break;
2164 } else
2165 break;
2166
2167 uopt.blocksize <<= 1;
1197e4df 2168 }
1da177e4 2169 }
d759bfa4
JK		 2170 if (ret < 0) {
2171 if (ret == -EAGAIN) {
2172 udf_warn(sb, "No partition found (1)\n");
2173 ret = -EINVAL;
2174 }
1da177e4
LT		 2175 goto error_out;
2176 }
2177
fcbf7637 2178 udf_debug("Lastblock=%u\n", sbi->s_last_block);
1da177e4 2179
6c79e987 2180 if (sbi->s_lvid_bh) {
4b11111a 2181 struct logicalVolIntegrityDescImpUse *lvidiu =
69d75671
JK		 2182 udf_sb_lvidiu(sb);
2183 uint16_t minUDFReadRev;
2184 uint16_t minUDFWriteRev;
1da177e4 2185
69d75671
JK		 2186 if (!lvidiu) {
2187 ret = -EINVAL;
2188 goto error_out;
2189 }
2190 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2191 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
cb00ea35 2192 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
78ace70c 2193 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
69d75671 2194 minUDFReadRev,
78ace70c 2195 UDF_MAX_READ_VERSION);
d759bfa4 2196 ret = -EINVAL;
1da177e4 2197 goto error_out;
e729eac6 2198 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
bc98a42c 2199 !sb_rdonly(sb)) {
e729eac6
JK		 2200 ret = -EACCES;
2201 goto error_out;
2202 }
1da177e4 2203
6c79e987 2204 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 2205
2206 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2207 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2208 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2209 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2210 }
2211
6c79e987 2212 if (!sbi->s_partitions) {
78ace70c 2213 udf_warn(sb, "No partition found (2)\n");
d759bfa4 2214 ret = -EINVAL;
1da177e4
LT		 2215 goto error_out;
2216 }
2217
4b11111a 2218 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
e729eac6 2219 UDF_PART_FLAG_READ_ONLY &&
bc98a42c 2220 !sb_rdonly(sb)) {
e729eac6
JK		 2221 ret = -EACCES;
2222 goto error_out;
c1a26e7d 2223 }
39b3f6d6 2224
cb00ea35 2225 if (udf_find_fileset(sb, &fileset, &rootdir)) {
78ace70c 2226 udf_warn(sb, "No fileset found\n");
d759bfa4 2227 ret = -EINVAL;
1da177e4
LT		 2228 goto error_out;
2229 }
2230
cb00ea35 2231 if (!silent) {
5ca4e4be 2232 struct timestamp ts;
56774805 2233 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
78ace70c
JP		 2234 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2235 sbi->s_volume_ident,
2236 le16_to_cpu(ts.year), ts.month, ts.day,
56774805 2237 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4 2238 }
bc98a42c 2239 if (!sb_rdonly(sb)) {
1da177e4 2240 udf_open_lvid(sb);
9181f8bf
JK		 2241 lvid_open = true;
2242 }
1da177e4
LT		 2243
2244 /* Assign the root inode */
2245 /* assign inodes by physical block number */
2246 /* perhaps it's not extensible enough, but for now ... */
97e961fd 2247 inode = udf_iget(sb, &rootdir);
6d3d5e86 2248 if (IS_ERR(inode)) {
fcbf7637 2249 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
cb00ea35 2250 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
6d3d5e86 2251 ret = PTR_ERR(inode);
1da177e4
LT		 2252 goto error_out;
2253 }
2254
2255 /* Allocate a dentry for the root inode */
48fde701 2256 sb->s_root = d_make_root(inode);
cb00ea35 2257 if (!sb->s_root) {
78ace70c 2258 udf_err(sb, "Couldn't allocate root dentry\n");
d759bfa4 2259 ret = -ENOMEM;
1da177e4
LT		 2260 goto error_out;
2261 }
31170b6a 2262 sb->s_maxbytes = MAX_LFS_FILESIZE;
8de52778 2263 sb->s_max_links = UDF_MAX_LINKS;
1da177e4
LT		 2264 return 0;
2265
28de7948 2266error_out:
0d454e4a 2267 iput(sbi->s_vat_inode);
fdf2657b 2268parse_options_failure:
1da177e4
LT		 2269#ifdef CONFIG_UDF_NLS
2270 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2271 unload_nls(sbi->s_nls_map);
1da177e4 2272#endif
9181f8bf 2273 if (lvid_open)
1da177e4 2274 udf_close_lvid(sb);
6c79e987 2275 brelse(sbi->s_lvid_bh);
bff943af 2276 udf_sb_free_partitions(sb);
1da177e4
LT		 2277 kfree(sbi);
2278 sb->s_fs_info = NULL;
28de7948 2279
d759bfa4 2280 return ret;
1da177e4
LT		 2281}
2282
8076c363
JP		 2283void _udf_err(struct super_block *sb, const char *function,
2284 const char *fmt, ...)
1da177e4 2285{
c2bff36c 2286 struct va_format vaf;
1da177e4
LT		 2287 va_list args;
2288
1da177e4 2289 va_start(args, fmt);
c2bff36c
JP		 2290
2291 vaf.fmt = fmt;
2292 vaf.va = &args;
2293
2294 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2295
1da177e4 2296 va_end(args);
1da177e4
LT		 2297}
2298
a40ecd7b
JP		 2299void _udf_warn(struct super_block *sb, const char *function,
2300 const char *fmt, ...)
1da177e4 2301{
c2bff36c 2302 struct va_format vaf;
1da177e4
LT		 2303 va_list args;
2304
cb00ea35 2305 va_start(args, fmt);
c2bff36c
JP		 2306
2307 vaf.fmt = fmt;
2308 vaf.va = &args;
2309
2310 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2311
1da177e4 2312 va_end(args);
1da177e4
LT		 2313}
2314
cb00ea35 2315static void udf_put_super(struct super_block *sb)
1da177e4 2316{
6c79e987 2317 struct udf_sb_info *sbi;
1da177e4 2318
6c79e987 2319 sbi = UDF_SB(sb);
6cfd0148 2320
0d454e4a 2321 iput(sbi->s_vat_inode);
1da177e4
LT		 2322#ifdef CONFIG_UDF_NLS
2323 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2324 unload_nls(sbi->s_nls_map);
1da177e4 2325#endif
bc98a42c 2326 if (!sb_rdonly(sb))
1da177e4 2327 udf_close_lvid(sb);
6c79e987 2328 brelse(sbi->s_lvid_bh);
bff943af 2329 udf_sb_free_partitions(sb);
bbe48dd8 2330 mutex_destroy(&sbi->s_alloc_mutex);
1da177e4
LT		 2331 kfree(sb->s_fs_info);
2332 sb->s_fs_info = NULL;
2333}
2334
146bca72
JK		 2335static int udf_sync_fs(struct super_block *sb, int wait)
2336{
2337 struct udf_sb_info *sbi = UDF_SB(sb);
2338
2339 mutex_lock(&sbi->s_alloc_mutex);
2340 if (sbi->s_lvid_dirty) {
2341 /*
2342 * Blockdevice will be synced later so we don't have to submit
2343 * the buffer for IO
2344 */
2345 mark_buffer_dirty(sbi->s_lvid_bh);
146bca72
JK		 2346 sbi->s_lvid_dirty = 0;
2347 }
2348 mutex_unlock(&sbi->s_alloc_mutex);
2349
2350 return 0;
2351}
2352
cb00ea35 2353static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 2354{
726c3342 2355 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 2356 struct udf_sb_info *sbi = UDF_SB(sb);
2357 struct logicalVolIntegrityDescImpUse *lvidiu;
557f5a14 2358 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
6c79e987 2359
69d75671 2360 lvidiu = udf_sb_lvidiu(sb);
1da177e4
LT		 2361 buf->f_type = UDF_SUPER_MAGIC;
2362 buf->f_bsize = sb->s_blocksize;
6c79e987 2363 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 2364 buf->f_bfree = udf_count_free(sb);
2365 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 2366 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2367 le32_to_cpu(lvidiu->numDirs)) : 0)
2368 + buf->f_bfree;
1da177e4 2369 buf->f_ffree = buf->f_bfree;
9fba7056 2370 buf->f_namelen = UDF_NAME_LEN;
557f5a14
CL		 2371 buf->f_fsid.val[0] = (u32)id;
2372 buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4
LT		 2373
2374 return 0;
2375}
2376
4b11111a
MS		 2377static unsigned int udf_count_free_bitmap(struct super_block *sb,
2378 struct udf_bitmap *bitmap)
1da177e4
LT		 2379{
2380 struct buffer_head *bh = NULL;
2381 unsigned int accum = 0;
2382 int index;
b490bdd6 2383 udf_pblk_t block = 0, newblock;
5ca4e4be 2384 struct kernel_lb_addr loc;
1da177e4 2385 uint32_t bytes;
1da177e4
LT		 2386 uint8_t *ptr;
2387 uint16_t ident;
2388 struct spaceBitmapDesc *bm;
2389
1da177e4 2390 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 2391 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
97e961fd 2392 bh = udf_read_ptagged(sb, &loc, 0, &ident);
1da177e4 2393
cb00ea35 2394 if (!bh) {
78ace70c 2395 udf_err(sb, "udf_count_free failed\n");
1da177e4 2396 goto out;
cb00ea35 2397 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 2398 brelse(bh);
78ace70c 2399 udf_err(sb, "udf_count_free failed\n");
1da177e4
LT		 2400 goto out;
2401 }
2402
2403 bm = (struct spaceBitmapDesc *)bh->b_data;
2404 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 2405 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2406 ptr = (uint8_t *)bh->b_data;
1da177e4 2407
cb00ea35 2408 while (bytes > 0) {
01b954a3
MS		 2409 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2410 accum += bitmap_weight((const unsigned long *)(ptr + index),
2411 cur_bytes * 8);
2412 bytes -= cur_bytes;
cb00ea35 2413 if (bytes) {
3bf25cb4 2414 brelse(bh);
97e961fd 2415 newblock = udf_get_lb_pblock(sb, &loc, ++block);
1da177e4 2416 bh = udf_tread(sb, newblock);
cb00ea35 2417 if (!bh) {
1da177e4
LT		 2418 udf_debug("read failed\n");
2419 goto out;
2420 }
2421 index = 0;
28de7948 2422 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2423 }
2424 }
3bf25cb4 2425 brelse(bh);
28de7948 2426out:
1da177e4
LT		 2427 return accum;
2428}
2429
4b11111a
MS		 2430static unsigned int udf_count_free_table(struct super_block *sb,
2431 struct inode *table)
1da177e4
LT		 2432{
2433 unsigned int accum = 0;
ff116fc8 2434 uint32_t elen;
5ca4e4be 2435 struct kernel_lb_addr eloc;
1da177e4 2436 int8_t etype;
ff116fc8 2437 struct extent_position epos;
1da177e4 2438
d1668fe3 2439 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
c0b34438 2440 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2441 epos.offset = sizeof(struct unallocSpaceEntry);
2442 epos.bh = NULL;
1da177e4 2443
3a71fc5d 2444 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2445 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2446
3bf25cb4 2447 brelse(epos.bh);
d1668fe3 2448 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
1da177e4
LT		 2449
2450 return accum;
2451}
cb00ea35
CG		 2452
2453static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2454{
2455 unsigned int accum = 0;
6c79e987
MS		 2456 struct udf_sb_info *sbi;
2457 struct udf_part_map *map;
1da177e4 2458
6c79e987
MS		 2459 sbi = UDF_SB(sb);
2460 if (sbi->s_lvid_bh) {
4b11111a
MS		 2461 struct logicalVolIntegrityDesc *lvid =
2462 (struct logicalVolIntegrityDesc *)
2463 sbi->s_lvid_bh->b_data;
6c79e987 2464 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2465 accum = le32_to_cpu(
2466 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2467 if (accum == 0xFFFFFFFF)
2468 accum = 0;
2469 }
2470 }
2471
2472 if (accum)
2473 return accum;
2474
6c79e987
MS		 2475 map = &sbi->s_partmaps[sbi->s_partition];
2476 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2477 accum += udf_count_free_bitmap(sb,
6c79e987 2478 map->s_uspace.s_bitmap);
1da177e4 2479 }
6c79e987 2480 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2481 accum += udf_count_free_bitmap(sb,
6c79e987 2482 map->s_fspace.s_bitmap);
1da177e4
LT		 2483 }
2484 if (accum)
2485 return accum;
2486
6c79e987 2487 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2488 accum += udf_count_free_table(sb,
6c79e987 2489 map->s_uspace.s_table);
1da177e4 2490 }
6c79e987 2491 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2492 accum += udf_count_free_table(sb,
6c79e987 2493 map->s_fspace.s_table);
1da177e4
LT		 2494 }
2495
2496 return accum;
2497}
54bb60d5
FF		 2498
2499MODULE_AUTHOR("Ben Fennema");
2500MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2501MODULE_LICENSE("GPL");
2502module_init(init_udf_fs)
2503module_exit(exit_udf_fs)
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