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udf: Fix handling of Partition Descriptors
[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 66
4b8d4252
JK		 67enum {
68 VDS_POS_PRIMARY_VOL_DESC,
69 VDS_POS_UNALLOC_SPACE_DESC,
70 VDS_POS_LOGICAL_VOL_DESC,
4b8d4252 71 VDS_POS_IMP_USE_VOL_DESC,
4b8d4252
JK		 72 VDS_POS_LENGTH
73};
1da177e4 74
44499602
PF		 75#define VSD_FIRST_SECTOR_OFFSET 32768
76#define VSD_MAX_SECTOR_OFFSET 0x800000
77
a47241cd
AT		 78/*
79 * Maximum number of Terminating Descriptor / Logical Volume Integrity
80 * Descriptor redirections. The chosen numbers are arbitrary - just that we
81 * hopefully don't limit any real use of rewritten inode on write-once media
82 * but avoid looping for too long on corrupted media.
83 */
84#define UDF_MAX_TD_NESTING 64
85#define UDF_MAX_LVID_NESTING 1000
86
8de52778
AV		 87enum { UDF_MAX_LINKS = 0xffff };
88
1da177e4
LT		 89/* These are the "meat" - everything else is stuffing */
90static int udf_fill_super(struct super_block *, void *, int);
91static void udf_put_super(struct super_block *);
146bca72 92static int udf_sync_fs(struct super_block *, int);
1da177e4 93static int udf_remount_fs(struct super_block *, int *, char *);
5ca4e4be 94static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
5ca4e4be
PE		 95static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
96 struct kernel_lb_addr *);
cb00ea35 97static void udf_load_fileset(struct super_block *, struct buffer_head *,
5ca4e4be 98 struct kernel_lb_addr *);
1da177e4
LT		 99static void udf_open_lvid(struct super_block *);
100static void udf_close_lvid(struct super_block *);
101static unsigned int udf_count_free(struct super_block *);
726c3342 102static int udf_statfs(struct dentry *, struct kstatfs *);
34c80b1d 103static int udf_show_options(struct seq_file *, struct dentry *);
1da177e4 104
69d75671 105struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
6c79e987 106{
69d75671
JK		 107 struct logicalVolIntegrityDesc *lvid;
108 unsigned int partnum;
109 unsigned int offset;
110
111 if (!UDF_SB(sb)->s_lvid_bh)
112 return NULL;
113 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
114 partnum = le32_to_cpu(lvid->numOfPartitions);
115 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
116 offsetof(struct logicalVolIntegrityDesc, impUse)) /
117 (2 * sizeof(uint32_t)) < partnum) {
118 udf_err(sb, "Logical volume integrity descriptor corrupted "
119 "(numOfPartitions = %u)!\n", partnum);
120 return NULL;
121 }
122 /* The offset is to skip freeSpaceTable and sizeTable arrays */
123 offset = partnum * 2 * sizeof(uint32_t);
6c79e987
MS		 124 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
125}
126
1da177e4 127/* UDF filesystem type */
152a0836
AV		 128static struct dentry *udf_mount(struct file_system_type *fs_type,
129 int flags, const char *dev_name, void *data)
1da177e4 130{
152a0836 131 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
1da177e4
LT		 132}
133
134static struct file_system_type udf_fstype = {
28de7948
CG		 135 .owner = THIS_MODULE,
136 .name = "udf",
152a0836 137 .mount = udf_mount,
28de7948
CG		 138 .kill_sb = kill_block_super,
139 .fs_flags = FS_REQUIRES_DEV,
1da177e4 140};
3e64fe5b 141MODULE_ALIAS_FS("udf");
1da177e4 142
cb00ea35 143static struct kmem_cache *udf_inode_cachep;
1da177e4
LT		 144
145static struct inode *udf_alloc_inode(struct super_block *sb)
146{
147 struct udf_inode_info *ei;
3a71fc5d 148 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
1da177e4
LT		 149 if (!ei)
150 return NULL;
95f8797f
DB		 151
152 ei->i_unique = 0;
153 ei->i_lenExtents = 0;
154 ei->i_next_alloc_block = 0;
155 ei->i_next_alloc_goal = 0;
156 ei->i_strat4096 = 0;
4d0fb621 157 init_rwsem(&ei->i_data_sem);
99600051
NJ		 158 ei->cached_extent.lstart = -1;
159 spin_lock_init(&ei->i_extent_cache_lock);
95f8797f 160
1da177e4
LT		 161 return &ei->vfs_inode;
162}
163
fa0d7e3d 164static void udf_i_callback(struct rcu_head *head)
1da177e4 165{
fa0d7e3d 166 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 167 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
168}
169
fa0d7e3d
NP		 170static void udf_destroy_inode(struct inode *inode)
171{
172 call_rcu(&inode->i_rcu, udf_i_callback);
173}
174
51cc5068 175static void init_once(void *foo)
1da177e4 176{
cb00ea35 177 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
1da177e4 178
a35afb83
CL		 179 ei->i_ext.i_data = NULL;
180 inode_init_once(&ei->vfs_inode);
1da177e4
LT		 181}
182
53ea18de 183static int __init init_inodecache(void)
1da177e4
LT		 184{
185 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
186 sizeof(struct udf_inode_info),
cb00ea35 187 0, (SLAB_RECLAIM_ACCOUNT |
5d097056
VD		 188 SLAB_MEM_SPREAD |
189 SLAB_ACCOUNT),
20c2df83 190 init_once);
28de7948 191 if (!udf_inode_cachep)
1da177e4
LT		 192 return -ENOMEM;
193 return 0;
194}
195
196static void destroy_inodecache(void)
197{
8c0a8537
KS		 198 /*
199 * Make sure all delayed rcu free inodes are flushed before we
200 * destroy cache.
201 */
202 rcu_barrier();
1a1d92c1 203 kmem_cache_destroy(udf_inode_cachep);
1da177e4
LT		 204}
205
206/* Superblock operations */
ee9b6d61 207static const struct super_operations udf_sb_ops = {
28de7948
CG		 208 .alloc_inode = udf_alloc_inode,
209 .destroy_inode = udf_destroy_inode,
210 .write_inode = udf_write_inode,
3aac2b62 211 .evict_inode = udf_evict_inode,
28de7948 212 .put_super = udf_put_super,
146bca72 213 .sync_fs = udf_sync_fs,
28de7948
CG		 214 .statfs = udf_statfs,
215 .remount_fs = udf_remount_fs,
6da80894 216 .show_options = udf_show_options,
1da177e4
LT		 217};
218
cb00ea35 219struct udf_options {
1da177e4
LT		 220 unsigned char novrs;
221 unsigned int blocksize;
222 unsigned int session;
223 unsigned int lastblock;
224 unsigned int anchor;
225 unsigned int volume;
226 unsigned short partition;
227 unsigned int fileset;
228 unsigned int rootdir;
229 unsigned int flags;
faa17292 230 umode_t umask;
c2ba138a
EB		 231 kgid_t gid;
232 kuid_t uid;
faa17292
AV		 233 umode_t fmode;
234 umode_t dmode;
1da177e4
LT		 235 struct nls_table *nls_map;
236};
237
238static int __init init_udf_fs(void)
239{
240 int err;
28de7948 241
1da177e4
LT		 242 err = init_inodecache();
243 if (err)
244 goto out1;
245 err = register_filesystem(&udf_fstype);
246 if (err)
247 goto out;
28de7948 248
1da177e4 249 return 0;
28de7948
CG		 250
251out:
1da177e4 252 destroy_inodecache();
28de7948
CG		 253
254out1:
1da177e4
LT		 255 return err;
256}
257
258static void __exit exit_udf_fs(void)
259{
260 unregister_filesystem(&udf_fstype);
261 destroy_inodecache();
262}
263
dc5d39be
MS		 264static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
265{
266 struct udf_sb_info *sbi = UDF_SB(sb);
267
033c9da0 268 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
dc5d39be 269 if (!sbi->s_partmaps) {
dc5d39be
MS		 270 sbi->s_partitions = 0;
271 return -ENOMEM;
272 }
273
274 sbi->s_partitions = count;
275 return 0;
276}
277
bff943af
JK		 278static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
279{
280 int i;
281 int nr_groups = bitmap->s_nr_groups;
bff943af
JK		 282
283 for (i = 0; i < nr_groups; i++)
284 if (bitmap->s_block_bitmap[i])
285 brelse(bitmap->s_block_bitmap[i]);
286
1d5cfdb0 287 kvfree(bitmap);
bff943af
JK		 288}
289
290static void udf_free_partition(struct udf_part_map *map)
291{
292 int i;
293 struct udf_meta_data *mdata;
294
295 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
296 iput(map->s_uspace.s_table);
297 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
298 iput(map->s_fspace.s_table);
299 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
300 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
301 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
302 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
303 if (map->s_partition_type == UDF_SPARABLE_MAP15)
304 for (i = 0; i < 4; i++)
305 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
306 else if (map->s_partition_type == UDF_METADATA_MAP25) {
307 mdata = &map->s_type_specific.s_metadata;
308 iput(mdata->s_metadata_fe);
309 mdata->s_metadata_fe = NULL;
310
311 iput(mdata->s_mirror_fe);
312 mdata->s_mirror_fe = NULL;
313
314 iput(mdata->s_bitmap_fe);
315 mdata->s_bitmap_fe = NULL;
316 }
317}
318
319static void udf_sb_free_partitions(struct super_block *sb)
320{
321 struct udf_sb_info *sbi = UDF_SB(sb);
322 int i;
ba2eb866
ME		 323
324 if (!sbi->s_partmaps)
1b1baff6 325 return;
bff943af
JK		 326 for (i = 0; i < sbi->s_partitions; i++)
327 udf_free_partition(&sbi->s_partmaps[i]);
328 kfree(sbi->s_partmaps);
329 sbi->s_partmaps = NULL;
330}
331
34c80b1d 332static int udf_show_options(struct seq_file *seq, struct dentry *root)
6da80894 333{
34c80b1d 334 struct super_block *sb = root->d_sb;
6da80894
MS		 335 struct udf_sb_info *sbi = UDF_SB(sb);
336
337 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
338 seq_puts(seq, ",nostrict");
1197e4df 339 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
6da80894
MS		 340 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
341 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
342 seq_puts(seq, ",unhide");
343 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
344 seq_puts(seq, ",undelete");
345 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
346 seq_puts(seq, ",noadinicb");
347 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
348 seq_puts(seq, ",shortad");
349 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
350 seq_puts(seq, ",uid=forget");
351 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
352 seq_puts(seq, ",uid=ignore");
353 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
354 seq_puts(seq, ",gid=forget");
355 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
356 seq_puts(seq, ",gid=ignore");
357 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
c2ba138a 358 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
6da80894 359 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
c2ba138a 360 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
6da80894 361 if (sbi->s_umask != 0)
faa17292 362 seq_printf(seq, ",umask=%ho", sbi->s_umask);
87bc730c 363 if (sbi->s_fmode != UDF_INVALID_MODE)
faa17292 364 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
87bc730c 365 if (sbi->s_dmode != UDF_INVALID_MODE)
faa17292 366 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
6da80894 367 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
fcbf7637 368 seq_printf(seq, ",session=%d", sbi->s_session);
6da80894
MS		 369 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
370 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
40346005
JK		 371 if (sbi->s_anchor != 0)
372 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
6da80894
MS		 373 /*
374 * volume, partition, fileset and rootdir seem to be ignored
375 * currently
376 */
377 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
378 seq_puts(seq, ",utf8");
379 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
380 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
381
382 return 0;
383}
384
1da177e4
LT		 385/*
386 * udf_parse_options
387 *
388 * PURPOSE
389 * Parse mount options.
390 *
391 * DESCRIPTION
392 * The following mount options are supported:
393 *
394 * gid= Set the default group.
395 * umask= Set the default umask.
7ac9bcd5
MS		 396 * mode= Set the default file permissions.
397 * dmode= Set the default directory permissions.
1da177e4
LT		 398 * uid= Set the default user.
399 * bs= Set the block size.
400 * unhide Show otherwise hidden files.
401 * undelete Show deleted files in lists.
402 * adinicb Embed data in the inode (default)
403 * noadinicb Don't embed data in the inode
404 * shortad Use short ad's
405 * longad Use long ad's (default)
406 * nostrict Unset strict conformance
407 * iocharset= Set the NLS character set
408 *
409 * The remaining are for debugging and disaster recovery:
410 *
28de7948 411 * novrs Skip volume sequence recognition
1da177e4
LT		 412 *
413 * The following expect a offset from 0.
414 *
415 * session= Set the CDROM session (default= last session)
416 * anchor= Override standard anchor location. (default= 256)
417 * volume= Override the VolumeDesc location. (unused)
418 * partition= Override the PartitionDesc location. (unused)
419 * lastblock= Set the last block of the filesystem/
420 *
421 * The following expect a offset from the partition root.
422 *
423 * fileset= Override the fileset block location. (unused)
424 * rootdir= Override the root directory location. (unused)
425 * WARNING: overriding the rootdir to a non-directory may
426 * yield highly unpredictable results.
427 *
428 * PRE-CONDITIONS
429 * options Pointer to mount options string.
430 * uopts Pointer to mount options variable.
431 *
432 * POST-CONDITIONS
433 * <return> 1 Mount options parsed okay.
434 * <return> 0 Error parsing mount options.
435 *
436 * HISTORY
437 * July 1, 1997 - Andrew E. Mileski
438 * Written, tested, and released.
439 */
28de7948 440
1da177e4
LT		 441enum {
442 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
443 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
444 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
445 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
446 Opt_rootdir, Opt_utf8, Opt_iocharset,
7ac9bcd5
MS		 447 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
448 Opt_fmode, Opt_dmode
1da177e4
LT		 449};
450
a447c093 451static const match_table_t tokens = {
28de7948
CG		 452 {Opt_novrs, "novrs"},
453 {Opt_nostrict, "nostrict"},
454 {Opt_bs, "bs=%u"},
455 {Opt_unhide, "unhide"},
456 {Opt_undelete, "undelete"},
457 {Opt_noadinicb, "noadinicb"},
458 {Opt_adinicb, "adinicb"},
459 {Opt_shortad, "shortad"},
460 {Opt_longad, "longad"},
461 {Opt_uforget, "uid=forget"},
462 {Opt_uignore, "uid=ignore"},
463 {Opt_gforget, "gid=forget"},
464 {Opt_gignore, "gid=ignore"},
465 {Opt_gid, "gid=%u"},
466 {Opt_uid, "uid=%u"},
467 {Opt_umask, "umask=%o"},
468 {Opt_session, "session=%u"},
469 {Opt_lastblock, "lastblock=%u"},
470 {Opt_anchor, "anchor=%u"},
471 {Opt_volume, "volume=%u"},
472 {Opt_partition, "partition=%u"},
473 {Opt_fileset, "fileset=%u"},
474 {Opt_rootdir, "rootdir=%u"},
475 {Opt_utf8, "utf8"},
476 {Opt_iocharset, "iocharset=%s"},
7ac9bcd5
MS		 477 {Opt_fmode, "mode=%o"},
478 {Opt_dmode, "dmode=%o"},
28de7948 479 {Opt_err, NULL}
1da177e4
LT		 480};
481
6da80894
MS		 482static int udf_parse_options(char *options, struct udf_options *uopt,
483 bool remount)
1da177e4
LT		 484{
485 char *p;
486 int option;
487
488 uopt->novrs = 0;
1da177e4
LT		 489 uopt->partition = 0xFFFF;
490 uopt->session = 0xFFFFFFFF;
491 uopt->lastblock = 0;
492 uopt->anchor = 0;
493 uopt->volume = 0xFFFFFFFF;
494 uopt->rootdir = 0xFFFFFFFF;
495 uopt->fileset = 0xFFFFFFFF;
496 uopt->nls_map = NULL;
497
498 if (!options)
499 return 1;
500
cb00ea35 501 while ((p = strsep(&options, ",")) != NULL) {
1da177e4
LT		 502 substring_t args[MAX_OPT_ARGS];
503 int token;
8c6915ae 504 unsigned n;
1da177e4
LT		 505 if (!*p)
506 continue;
507
508 token = match_token(p, tokens, args);
cb00ea35
CG		 509 switch (token) {
510 case Opt_novrs:
511 uopt->novrs = 1;
4136801a 512 break;
cb00ea35
CG		 513 case Opt_bs:
514 if (match_int(&args[0], &option))
515 return 0;
8c6915ae
FF		 516 n = option;
517 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
518 return 0;
519 uopt->blocksize = n;
1197e4df 520 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
cb00ea35
CG		 521 break;
522 case Opt_unhide:
523 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
524 break;
525 case Opt_undelete:
526 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
527 break;
528 case Opt_noadinicb:
529 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
530 break;
531 case Opt_adinicb:
532 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
533 break;
534 case Opt_shortad:
535 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
536 break;
537 case Opt_longad:
538 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
539 break;
540 case Opt_gid:
541 if (match_int(args, &option))
542 return 0;
c2ba138a
EB		 543 uopt->gid = make_kgid(current_user_ns(), option);
544 if (!gid_valid(uopt->gid))
545 return 0;
ca76d2d8 546 uopt->flags |= (1 << UDF_FLAG_GID_SET);
cb00ea35
CG		 547 break;
548 case Opt_uid:
549 if (match_int(args, &option))
550 return 0;
c2ba138a
EB		 551 uopt->uid = make_kuid(current_user_ns(), option);
552 if (!uid_valid(uopt->uid))
553 return 0;
ca76d2d8 554 uopt->flags |= (1 << UDF_FLAG_UID_SET);
cb00ea35
CG		 555 break;
556 case Opt_umask:
557 if (match_octal(args, &option))
558 return 0;
559 uopt->umask = option;
560 break;
561 case Opt_nostrict:
562 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
563 break;
564 case Opt_session:
565 if (match_int(args, &option))
566 return 0;
567 uopt->session = option;
6da80894
MS		 568 if (!remount)
569 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
cb00ea35
CG		 570 break;
571 case Opt_lastblock:
572 if (match_int(args, &option))
573 return 0;
574 uopt->lastblock = option;
6da80894
MS		 575 if (!remount)
576 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
cb00ea35
CG		 577 break;
578 case Opt_anchor:
579 if (match_int(args, &option))
580 return 0;
581 uopt->anchor = option;
582 break;
583 case Opt_volume:
584 if (match_int(args, &option))
585 return 0;
586 uopt->volume = option;
587 break;
588 case Opt_partition:
589 if (match_int(args, &option))
590 return 0;
591 uopt->partition = option;
592 break;
593 case Opt_fileset:
594 if (match_int(args, &option))
595 return 0;
596 uopt->fileset = option;
597 break;
598 case Opt_rootdir:
599 if (match_int(args, &option))
600 return 0;
601 uopt->rootdir = option;
602 break;
603 case Opt_utf8:
604 uopt->flags |= (1 << UDF_FLAG_UTF8);
605 break;
1da177e4 606#ifdef CONFIG_UDF_NLS
cb00ea35
CG		 607 case Opt_iocharset:
608 uopt->nls_map = load_nls(args[0].from);
609 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
610 break;
1da177e4 611#endif
cb00ea35
CG		 612 case Opt_uignore:
613 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
614 break;
615 case Opt_uforget:
616 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
617 break;
618 case Opt_gignore:
619 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
620 break;
621 case Opt_gforget:
622 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
623 break;
7ac9bcd5
MS		 624 case Opt_fmode:
625 if (match_octal(args, &option))
626 return 0;
627 uopt->fmode = option & 0777;
628 break;
629 case Opt_dmode:
630 if (match_octal(args, &option))
631 return 0;
632 uopt->dmode = option & 0777;
633 break;
cb00ea35 634 default:
78ace70c 635 pr_err("bad mount option \"%s\" or missing value\n", p);
1da177e4
LT		 636 return 0;
637 }
638 }
639 return 1;
640}
641
cb00ea35 642static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
1da177e4
LT		 643{
644 struct udf_options uopt;
6c79e987 645 struct udf_sb_info *sbi = UDF_SB(sb);
c79d967d 646 int error = 0;
69d75671 647 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
1da177e4 648
02b9984d 649 sync_filesystem(sb);
69d75671
JK		 650 if (lvidiu) {
651 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
1751e8a6 652 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & SB_RDONLY))
e729eac6
JK		 653 return -EACCES;
654 }
655
6c79e987
MS		 656 uopt.flags = sbi->s_flags;
657 uopt.uid = sbi->s_uid;
658 uopt.gid = sbi->s_gid;
659 uopt.umask = sbi->s_umask;
7ac9bcd5
MS		 660 uopt.fmode = sbi->s_fmode;
661 uopt.dmode = sbi->s_dmode;
1da177e4 662
6da80894 663 if (!udf_parse_options(options, &uopt, true))
1da177e4
LT		 664 return -EINVAL;
665
c03cad24 666 write_lock(&sbi->s_cred_lock);
6c79e987
MS		 667 sbi->s_flags = uopt.flags;
668 sbi->s_uid = uopt.uid;
669 sbi->s_gid = uopt.gid;
670 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 671 sbi->s_fmode = uopt.fmode;
672 sbi->s_dmode = uopt.dmode;
c03cad24 673 write_unlock(&sbi->s_cred_lock);
1da177e4 674
1751e8a6 675 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
c79d967d
CH		 676 goto out_unlock;
677
1751e8a6 678 if (*flags & SB_RDONLY)
1da177e4 679 udf_close_lvid(sb);
36350462 680 else
1da177e4
LT		 681 udf_open_lvid(sb);
682
c79d967d 683out_unlock:
c79d967d 684 return error;
1da177e4
LT		 685}
686
40346005
JK		 687/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
688/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
689static loff_t udf_check_vsd(struct super_block *sb)
1da177e4
LT		 690{
691 struct volStructDesc *vsd = NULL;
44499602 692 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
1da177e4
LT		 693 int sectorsize;
694 struct buffer_head *bh = NULL;
cb00ea35
CG		 695 int nsr02 = 0;
696 int nsr03 = 0;
6c79e987 697 struct udf_sb_info *sbi;
1da177e4 698
6c79e987 699 sbi = UDF_SB(sb);
1da177e4
LT		 700 if (sb->s_blocksize < sizeof(struct volStructDesc))
701 sectorsize = sizeof(struct volStructDesc);
702 else
703 sectorsize = sb->s_blocksize;
704
abdc0eb0 705 sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);
1da177e4 706
fcbf7637 707 udf_debug("Starting at sector %u (%lu byte sectors)\n",
706047a7
SM		 708 (unsigned int)(sector >> sb->s_blocksize_bits),
709 sb->s_blocksize);
44499602
PF		 710 /* Process the sequence (if applicable). The hard limit on the sector
711 * offset is arbitrary, hopefully large enough so that all valid UDF
712 * filesystems will be recognised. There is no mention of an upper
713 * bound to the size of the volume recognition area in the standard.
714 * The limit will prevent the code to read all the sectors of a
715 * specially crafted image (like a bluray disc full of CD001 sectors),
716 * potentially causing minutes or even hours of uninterruptible I/O
717 * activity. This actually happened with uninitialised SSD partitions
718 * (all 0xFF) before the check for the limit and all valid IDs were
719 * added */
720 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
721 sector += sectorsize) {
1da177e4
LT		 722 /* Read a block */
723 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
724 if (!bh)
725 break;
726
727 /* Look for ISO descriptors */
728 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 729 (sector & (sb->s_blocksize - 1)));
1da177e4 730
44499602 731 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
3a71fc5d 732 VSD_STD_ID_LEN)) {
cb00ea35
CG		 733 switch (vsd->structType) {
734 case 0:
735 udf_debug("ISO9660 Boot Record found\n");
736 break;
737 case 1:
a983f368 738 udf_debug("ISO9660 Primary Volume Descriptor found\n");
cb00ea35
CG		 739 break;
740 case 2:
a983f368 741 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
cb00ea35
CG		 742 break;
743 case 3:
a983f368 744 udf_debug("ISO9660 Volume Partition Descriptor found\n");
cb00ea35
CG		 745 break;
746 case 255:
a983f368 747 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
cb00ea35
CG		 748 break;
749 default:
750 udf_debug("ISO9660 VRS (%u) found\n",
751 vsd->structType);
752 break;
1da177e4 753 }
3a71fc5d
MS		 754 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
755 VSD_STD_ID_LEN))
756 ; /* nothing */
757 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
758 VSD_STD_ID_LEN)) {
3bf25cb4 759 brelse(bh);
1da177e4 760 break;
3a71fc5d
MS		 761 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
762 VSD_STD_ID_LEN))
1da177e4 763 nsr02 = sector;
3a71fc5d
MS		 764 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
765 VSD_STD_ID_LEN))
1da177e4 766 nsr03 = sector;
44499602
PF		 767 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
768 VSD_STD_ID_LEN))
769 ; /* nothing */
770 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
771 VSD_STD_ID_LEN))
772 ; /* nothing */
773 else {
774 /* invalid id : end of volume recognition area */
775 brelse(bh);
776 break;
777 }
3bf25cb4 778 brelse(bh);
1da177e4
LT		 779 }
780
781 if (nsr03)
782 return nsr03;
783 else if (nsr02)
784 return nsr02;
44499602
PF		 785 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
786 VSD_FIRST_SECTOR_OFFSET)
1da177e4
LT		 787 return -1;
788 else
789 return 0;
790}
791
3a71fc5d 792static int udf_find_fileset(struct super_block *sb,
5ca4e4be
PE		 793 struct kernel_lb_addr *fileset,
794 struct kernel_lb_addr *root)
1da177e4
LT		 795{
796 struct buffer_head *bh = NULL;
797 long lastblock;
798 uint16_t ident;
6c79e987 799 struct udf_sb_info *sbi;
1da177e4
LT		 800
801 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 802 fileset->partitionReferenceNum != 0xFFFF) {
97e961fd 803 bh = udf_read_ptagged(sb, fileset, 0, &ident);
1da177e4 804
28de7948 805 if (!bh) {
1da177e4 806 return 1;
28de7948 807 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 808 brelse(bh);
1da177e4
LT		 809 return 1;
810 }
cb00ea35 811
1da177e4
LT		 812 }
813
6c79e987 814 sbi = UDF_SB(sb);
3a71fc5d
MS		 815 if (!bh) {
816 /* Search backwards through the partitions */
5ca4e4be 817 struct kernel_lb_addr newfileset;
1da177e4 818
28de7948 819/* --> cvg: FIXME - is it reasonable? */
1da177e4 820 return 1;
cb00ea35 821
6c79e987 822 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 823 (newfileset.partitionReferenceNum != 0xFFFF &&
824 fileset->logicalBlockNum == 0xFFFFFFFF &&
825 fileset->partitionReferenceNum == 0xFFFF);
826 newfileset.partitionReferenceNum--) {
6c79e987
MS		 827 lastblock = sbi->s_partmaps
828 [newfileset.partitionReferenceNum]
829 .s_partition_len;
1da177e4
LT		 830 newfileset.logicalBlockNum = 0;
831
cb00ea35 832 do {
97e961fd 833 bh = udf_read_ptagged(sb, &newfileset, 0,
3a71fc5d 834 &ident);
cb00ea35
CG		 835 if (!bh) {
836 newfileset.logicalBlockNum++;
1da177e4
LT		 837 continue;
838 }
839
cb00ea35
CG		 840 switch (ident) {
841 case TAG_IDENT_SBD:
28de7948
CG		 842 {
843 struct spaceBitmapDesc *sp;
4b11111a
MS		 844 sp = (struct spaceBitmapDesc *)
845 bh->b_data;
28de7948
CG		 846 newfileset.logicalBlockNum += 1 +
847 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 848 sizeof(struct spaceBitmapDesc)
849 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 850 brelse(bh);
851 break;
852 }
cb00ea35 853 case TAG_IDENT_FSD:
28de7948
CG		 854 *fileset = newfileset;
855 break;
cb00ea35 856 default:
28de7948
CG		 857 newfileset.logicalBlockNum++;
858 brelse(bh);
859 bh = NULL;
860 break;
1da177e4 861 }
28de7948
CG		 862 } while (newfileset.logicalBlockNum < lastblock &&
863 fileset->logicalBlockNum == 0xFFFFFFFF &&
864 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 865 }
866 }
867
868 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 869 fileset->partitionReferenceNum != 0xFFFF) && bh) {
fcbf7637 870 udf_debug("Fileset at block=%u, partition=%u\n",
cb00ea35
CG		 871 fileset->logicalBlockNum,
872 fileset->partitionReferenceNum);
1da177e4 873
6c79e987 874 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 875 udf_load_fileset(sb, bh, root);
3bf25cb4 876 brelse(bh);
1da177e4
LT		 877 return 0;
878 }
879 return 1;
880}
881
d759bfa4
JK		 882/*
883 * Load primary Volume Descriptor Sequence
884 *
885 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
886 * should be tried.
887 */
c0eb31ed 888static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 889{
890 struct primaryVolDesc *pvoldesc;
9293fcfb 891 uint8_t *outstr;
c0eb31ed
JK		 892 struct buffer_head *bh;
893 uint16_t ident;
d759bfa4 894 int ret = -ENOMEM;
ba9aadd8 895
9293fcfb 896 outstr = kmalloc(128, GFP_NOFS);
ba9aadd8 897 if (!outstr)
9293fcfb 898 return -ENOMEM;
c0eb31ed
JK		 899
900 bh = udf_read_tagged(sb, block, block, &ident);
d759bfa4
JK		 901 if (!bh) {
902 ret = -EAGAIN;
ba9aadd8 903 goto out2;
d759bfa4 904 }
ba9aadd8 905
d759bfa4
JK		 906 if (ident != TAG_IDENT_PVD) {
907 ret = -EIO;
908 goto out_bh;
909 }
1da177e4
LT		 910
911 pvoldesc = (struct primaryVolDesc *)bh->b_data;
912
56774805
MS		 913 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
914 pvoldesc->recordingDateAndTime)) {
af15a298 915#ifdef UDFFS_DEBUG
5ca4e4be 916 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
a983f368 917 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
af15a298
MS		 918 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
919 ts->minute, le16_to_cpu(ts->typeAndTimezone));
920#endif
1da177e4
LT		 921 }
922
c26f6c61 923 ret = udf_dstrCS0toUTF8(outstr, 31, pvoldesc->volIdent, 32);
9293fcfb
AG		 924 if (ret < 0)
925 goto out_bh;
e9d4cf41 926
9293fcfb
AG		 927 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
928 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
1da177e4 929
c26f6c61 930 ret = udf_dstrCS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128);
9293fcfb
AG		 931 if (ret < 0)
932 goto out_bh;
e9d4cf41 933
9293fcfb
AG		 934 outstr[ret] = 0;
935 udf_debug("volSetIdent[] = '%s'\n", outstr);
c0eb31ed 936
ba9aadd8 937 ret = 0;
d759bfa4
JK		 938out_bh:
939 brelse(bh);
ba9aadd8
MS		 940out2:
941 kfree(outstr);
ba9aadd8 942 return ret;
1da177e4
LT		 943}
944
3080a74e 945struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
7888824b 946 u32 meta_file_loc, u32 partition_ref)
3080a74e
NJ		 947{
948 struct kernel_lb_addr addr;
949 struct inode *metadata_fe;
950
951 addr.logicalBlockNum = meta_file_loc;
7888824b 952 addr.partitionReferenceNum = partition_ref;
3080a74e 953
6174c2eb 954 metadata_fe = udf_iget_special(sb, &addr);
3080a74e 955
6d3d5e86 956 if (IS_ERR(metadata_fe)) {
3080a74e 957 udf_warn(sb, "metadata inode efe not found\n");
6d3d5e86
JK		 958 return metadata_fe;
959 }
960 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
3080a74e
NJ		 961 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
962 iput(metadata_fe);
6d3d5e86 963 return ERR_PTR(-EIO);
3080a74e
NJ		 964 }
965
966 return metadata_fe;
967}
968
7888824b
AT		 969static int udf_load_metadata_files(struct super_block *sb, int partition,
970 int type1_index)
bfb257a5
JK		 971{
972 struct udf_sb_info *sbi = UDF_SB(sb);
973 struct udf_part_map *map;
974 struct udf_meta_data *mdata;
5ca4e4be 975 struct kernel_lb_addr addr;
6d3d5e86 976 struct inode *fe;
bfb257a5
JK		 977
978 map = &sbi->s_partmaps[partition];
979 mdata = &map->s_type_specific.s_metadata;
7888824b 980 mdata->s_phys_partition_ref = type1_index;
bfb257a5
JK		 981
982 /* metadata address */
fcbf7637 983 udf_debug("Metadata file location: block = %u part = %u\n",
7888824b 984 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
bfb257a5 985
6d3d5e86 986 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
7888824b 987 mdata->s_phys_partition_ref);
6d3d5e86 988 if (IS_ERR(fe)) {
3080a74e 989 /* mirror file entry */
fcbf7637 990 udf_debug("Mirror metadata file location: block = %u part = %u\n",
7888824b 991 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
bfb257a5 992
6d3d5e86 993 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
7888824b 994 mdata->s_phys_partition_ref);
bfb257a5 995
6d3d5e86 996 if (IS_ERR(fe)) {
3080a74e 997 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
6d3d5e86 998 return PTR_ERR(fe);
3080a74e 999 }
6d3d5e86
JK		 1000 mdata->s_mirror_fe = fe;
1001 } else
1002 mdata->s_metadata_fe = fe;
1003
bfb257a5
JK		 1004
1005 /*
1006 * bitmap file entry
1007 * Note:
1008 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1009 */
1010 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1011 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
7888824b 1012 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
bfb257a5 1013
fcbf7637 1014 udf_debug("Bitmap file location: block = %u part = %u\n",
a983f368 1015 addr.logicalBlockNum, addr.partitionReferenceNum);
bfb257a5 1016
6174c2eb 1017 fe = udf_iget_special(sb, &addr);
6d3d5e86 1018 if (IS_ERR(fe)) {
bc98a42c 1019 if (sb_rdonly(sb))
a40ecd7b 1020 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
bfb257a5 1021 else {
8076c363 1022 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
6d3d5e86 1023 return PTR_ERR(fe);
bfb257a5 1024 }
6d3d5e86
JK		 1025 } else
1026 mdata->s_bitmap_fe = fe;
bfb257a5
JK		 1027 }
1028
1029 udf_debug("udf_load_metadata_files Ok\n");
bfb257a5 1030 return 0;
bfb257a5
JK		 1031}
1032
28de7948 1033static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
5ca4e4be 1034 struct kernel_lb_addr *root)
1da177e4
LT		 1035{
1036 struct fileSetDesc *fset;
1037
1038 fset = (struct fileSetDesc *)bh->b_data;
1039
1040 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1041
6c79e987 1042 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 1043
fcbf7637 1044 udf_debug("Rootdir at block=%u, partition=%u\n",
cb00ea35 1045 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 1046}
1047
883cb9d1
MS		 1048int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1049{
1050 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 1051 return DIV_ROUND_UP(map->s_partition_len +
1052 (sizeof(struct spaceBitmapDesc) << 3),
1053 sb->s_blocksize * 8);
883cb9d1
MS		 1054}
1055
66e1da3f
MS		 1056static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1057{
66e1da3f
MS		 1058 struct udf_bitmap *bitmap;
1059 int nr_groups;
1060 int size;
1061
883cb9d1 1062 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 1063 size = sizeof(struct udf_bitmap) +
1064 (sizeof(struct buffer_head *) * nr_groups);
1065
1066 if (size <= PAGE_SIZE)
ed2ae6f6 1067 bitmap = kzalloc(size, GFP_KERNEL);
66e1da3f 1068 else
ed2ae6f6 1069 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
66e1da3f 1070
ba2eb866 1071 if (!bitmap)
66e1da3f 1072 return NULL;
66e1da3f 1073
66e1da3f
MS		 1074 bitmap->s_nr_groups = nr_groups;
1075 return bitmap;
1076}
1077
3fb38dfa
JK		 1078static int udf_fill_partdesc_info(struct super_block *sb,
1079 struct partitionDesc *p, int p_index)
1da177e4 1080{
6c79e987 1081 struct udf_part_map *map;
165923fa 1082 struct udf_sb_info *sbi = UDF_SB(sb);
3fb38dfa 1083 struct partitionHeaderDesc *phd;
165923fa 1084
3fb38dfa 1085 map = &sbi->s_partmaps[p_index];
165923fa
MS		 1086
1087 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1088 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1089
1090 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1091 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1092 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1093 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1094 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1095 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1096 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1097 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1098
fcbf7637 1099 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
a983f368
JP		 1100 p_index, map->s_partition_type,
1101 map->s_partition_root, map->s_partition_len);
165923fa
MS		 1102
1103 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1104 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
3fb38dfa 1105 return 0;
165923fa
MS		 1106
1107 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1108 if (phd->unallocSpaceTable.extLength) {
5ca4e4be 1109 struct kernel_lb_addr loc = {
165923fa
MS		 1110 .logicalBlockNum = le32_to_cpu(
1111 phd->unallocSpaceTable.extPosition),
3fb38dfa 1112 .partitionReferenceNum = p_index,
165923fa 1113 };
6d3d5e86 1114 struct inode *inode;
165923fa 1115
6174c2eb 1116 inode = udf_iget_special(sb, &loc);
6d3d5e86 1117 if (IS_ERR(inode)) {
165923fa 1118 udf_debug("cannot load unallocSpaceTable (part %d)\n",
a983f368 1119 p_index);
6d3d5e86 1120 return PTR_ERR(inode);
165923fa 1121 }
6d3d5e86 1122 map->s_uspace.s_table = inode;
165923fa 1123 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
fcbf7637 1124 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
a983f368 1125 p_index, map->s_uspace.s_table->i_ino);
165923fa
MS		 1126 }
1127
1128 if (phd->unallocSpaceBitmap.extLength) {
3fb38dfa
JK		 1129 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1130 if (!bitmap)
d759bfa4 1131 return -ENOMEM;
165923fa 1132 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1133 bitmap->s_extPosition = le32_to_cpu(
165923fa 1134 phd->unallocSpaceBitmap.extPosition);
2e0838fd 1135 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
fcbf7637 1136 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
a983f368 1137 p_index, bitmap->s_extPosition);
165923fa
MS		 1138 }
1139
1140 if (phd->partitionIntegrityTable.extLength)
3fb38dfa 1141 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
165923fa
MS		 1142
1143 if (phd->freedSpaceTable.extLength) {
5ca4e4be 1144 struct kernel_lb_addr loc = {
165923fa
MS		 1145 .logicalBlockNum = le32_to_cpu(
1146 phd->freedSpaceTable.extPosition),
3fb38dfa 1147 .partitionReferenceNum = p_index,
165923fa 1148 };
6d3d5e86 1149 struct inode *inode;
165923fa 1150
6174c2eb 1151 inode = udf_iget_special(sb, &loc);
6d3d5e86 1152 if (IS_ERR(inode)) {
3fb38dfa 1153 udf_debug("cannot load freedSpaceTable (part %d)\n",
a983f368 1154 p_index);
6d3d5e86 1155 return PTR_ERR(inode);
165923fa 1156 }
6d3d5e86 1157 map->s_fspace.s_table = inode;
165923fa 1158 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
fcbf7637 1159 udf_debug("freedSpaceTable (part %d) @ %lu\n",
a983f368 1160 p_index, map->s_fspace.s_table->i_ino);
165923fa
MS		 1161 }
1162
1163 if (phd->freedSpaceBitmap.extLength) {
3fb38dfa
JK		 1164 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1165 if (!bitmap)
d759bfa4 1166 return -ENOMEM;
165923fa 1167 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1168 bitmap->s_extPosition = le32_to_cpu(
165923fa 1169 phd->freedSpaceBitmap.extPosition);
2e0838fd 1170 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
fcbf7637 1171 udf_debug("freedSpaceBitmap (part %d) @ %u\n",
a983f368 1172 p_index, bitmap->s_extPosition);
165923fa 1173 }
3fb38dfa
JK		 1174 return 0;
1175}
1176
e971b0b9
JK		 1177static void udf_find_vat_block(struct super_block *sb, int p_index,
1178 int type1_index, sector_t start_block)
38b74a53
JK		 1179{
1180 struct udf_sb_info *sbi = UDF_SB(sb);
1181 struct udf_part_map *map = &sbi->s_partmaps[p_index];
e971b0b9 1182 sector_t vat_block;
5ca4e4be 1183 struct kernel_lb_addr ino;
6d3d5e86 1184 struct inode *inode;
e971b0b9
JK		 1185
1186 /*
1187 * VAT file entry is in the last recorded block. Some broken disks have
1188 * it a few blocks before so try a bit harder...
1189 */
1190 ino.partitionReferenceNum = type1_index;
1191 for (vat_block = start_block;
1192 vat_block >= map->s_partition_root &&
6d3d5e86 1193 vat_block >= start_block - 3; vat_block--) {
e971b0b9 1194 ino.logicalBlockNum = vat_block - map->s_partition_root;
6174c2eb 1195 inode = udf_iget_special(sb, &ino);
6d3d5e86
JK		 1196 if (!IS_ERR(inode)) {
1197 sbi->s_vat_inode = inode;
1198 break;
1199 }
e971b0b9
JK		 1200 }
1201}
1202
1203static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1204{
1205 struct udf_sb_info *sbi = UDF_SB(sb);
1206 struct udf_part_map *map = &sbi->s_partmaps[p_index];
fa5e0815
JK		 1207 struct buffer_head *bh = NULL;
1208 struct udf_inode_info *vati;
1209 uint32_t pos;
1210 struct virtualAllocationTable20 *vat20;
23bcda11
FF		 1211 sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1212 sb->s_blocksize_bits;
38b74a53 1213
e971b0b9 1214 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
4bf17af0
JK		 1215 if (!sbi->s_vat_inode &&
1216 sbi->s_last_block != blocks - 1) {
78ace70c
JP		 1217 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1218 (unsigned long)sbi->s_last_block,
1219 (unsigned long)blocks - 1);
e971b0b9 1220 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
4bf17af0 1221 }
38b74a53 1222 if (!sbi->s_vat_inode)
d759bfa4 1223 return -EIO;
38b74a53
JK		 1224
1225 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1226 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1227 map->s_type_specific.s_virtual.s_num_entries =
1228 (sbi->s_vat_inode->i_size - 36) >> 2;
1229 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1230 vati = UDF_I(sbi->s_vat_inode);
1231 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1232 pos = udf_block_map(sbi->s_vat_inode, 0);
1233 bh = sb_bread(sb, pos);
1234 if (!bh)
d759bfa4 1235 return -EIO;
fa5e0815
JK		 1236 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1237 } else {
1238 vat20 = (struct virtualAllocationTable20 *)
1239 vati->i_ext.i_data;
1240 }
38b74a53 1241
38b74a53 1242 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1243 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1244 map->s_type_specific.s_virtual.s_num_entries =
1245 (sbi->s_vat_inode->i_size -
1246 map->s_type_specific.s_virtual.
1247 s_start_offset) >> 2;
1248 brelse(bh);
1249 }
1250 return 0;
1251}
1252
d759bfa4
JK		 1253/*
1254 * Load partition descriptor block
1255 *
1256 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1257 * sequence.
1258 */
3fb38dfa
JK		 1259static int udf_load_partdesc(struct super_block *sb, sector_t block)
1260{
1261 struct buffer_head *bh;
1262 struct partitionDesc *p;
1263 struct udf_part_map *map;
1264 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1265 int i, type1_idx;
3fb38dfa
JK		 1266 uint16_t partitionNumber;
1267 uint16_t ident;
d759bfa4 1268 int ret;
3fb38dfa
JK		 1269
1270 bh = udf_read_tagged(sb, block, block, &ident);
1271 if (!bh)
d759bfa4
JK		 1272 return -EAGAIN;
1273 if (ident != TAG_IDENT_PD) {
1274 ret = 0;
3fb38dfa 1275 goto out_bh;
d759bfa4 1276 }
3fb38dfa
JK		 1277
1278 p = (struct partitionDesc *)bh->b_data;
1279 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1280
7888824b 1281 /* First scan for TYPE1 and SPARABLE partitions */
3fb38dfa
JK		 1282 for (i = 0; i < sbi->s_partitions; i++) {
1283 map = &sbi->s_partmaps[i];
fcbf7637 1284 udf_debug("Searching map: (%u == %u)\n",
3fb38dfa 1285 map->s_partition_num, partitionNumber);
38b74a53
JK		 1286 if (map->s_partition_num == partitionNumber &&
1287 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1288 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1289 break;
1290 }
1291
38b74a53 1292 if (i >= sbi->s_partitions) {
fcbf7637 1293 udf_debug("Partition (%u) not found in partition map\n",
3fb38dfa 1294 partitionNumber);
d759bfa4 1295 ret = 0;
3fb38dfa
JK		 1296 goto out_bh;
1297 }
165923fa 1298
3fb38dfa 1299 ret = udf_fill_partdesc_info(sb, p, i);
d759bfa4
JK		 1300 if (ret < 0)
1301 goto out_bh;
38b74a53
JK		 1302
1303 /*
bfb257a5
JK		 1304 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1305 * PHYSICAL partitions are already set up
38b74a53
JK		 1306 */
1307 type1_idx = i;
44499602
PF		 1308#ifdef UDFFS_DEBUG
1309 map = NULL; /* supress 'maybe used uninitialized' warning */
1310#endif
38b74a53
JK		 1311 for (i = 0; i < sbi->s_partitions; i++) {
1312 map = &sbi->s_partmaps[i];
1313
1314 if (map->s_partition_num == partitionNumber &&
1315 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1316 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1317 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1318 break;
1319 }
1320
d759bfa4
JK		 1321 if (i >= sbi->s_partitions) {
1322 ret = 0;
38b74a53 1323 goto out_bh;
d759bfa4 1324 }
38b74a53
JK		 1325
1326 ret = udf_fill_partdesc_info(sb, p, i);
d759bfa4 1327 if (ret < 0)
38b74a53
JK		 1328 goto out_bh;
1329
bfb257a5 1330 if (map->s_partition_type == UDF_METADATA_MAP25) {
7888824b 1331 ret = udf_load_metadata_files(sb, i, type1_idx);
d759bfa4 1332 if (ret < 0) {
78ace70c
JP		 1333 udf_err(sb, "error loading MetaData partition map %d\n",
1334 i);
bfb257a5
JK		 1335 goto out_bh;
1336 }
1337 } else {
e729eac6
JK		 1338 /*
1339 * If we have a partition with virtual map, we don't handle
1340 * writing to it (we overwrite blocks instead of relocating
1341 * them).
1342 */
bc98a42c 1343 if (!sb_rdonly(sb)) {
e729eac6
JK		 1344 ret = -EACCES;
1345 goto out_bh;
1346 }
bfb257a5 1347 ret = udf_load_vat(sb, i, type1_idx);
d759bfa4 1348 if (ret < 0)
bfb257a5 1349 goto out_bh;
bfb257a5 1350 }
d759bfa4 1351 ret = 0;
c0eb31ed 1352out_bh:
2e0838fd 1353 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1354 brelse(bh);
1355 return ret;
1da177e4
LT		 1356}
1357
1df2ae31
JK		 1358static int udf_load_sparable_map(struct super_block *sb,
1359 struct udf_part_map *map,
1360 struct sparablePartitionMap *spm)
1361{
1362 uint32_t loc;
1363 uint16_t ident;
1364 struct sparingTable *st;
1365 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1366 int i;
1367 struct buffer_head *bh;
1368
1369 map->s_partition_type = UDF_SPARABLE_MAP15;
1370 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1371 if (!is_power_of_2(sdata->s_packet_len)) {
1372 udf_err(sb, "error loading logical volume descriptor: "
1373 "Invalid packet length %u\n",
1374 (unsigned)sdata->s_packet_len);
1375 return -EIO;
1376 }
1377 if (spm->numSparingTables > 4) {
1378 udf_err(sb, "error loading logical volume descriptor: "
1379 "Too many sparing tables (%d)\n",
1380 (int)spm->numSparingTables);
1381 return -EIO;
1382 }
1383
1384 for (i = 0; i < spm->numSparingTables; i++) {
1385 loc = le32_to_cpu(spm->locSparingTable[i]);
1386 bh = udf_read_tagged(sb, loc, loc, &ident);
1387 if (!bh)
1388 continue;
1389
1390 st = (struct sparingTable *)bh->b_data;
1391 if (ident != 0 ||
1392 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1393 strlen(UDF_ID_SPARING)) ||
1394 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1395 sb->s_blocksize) {
1396 brelse(bh);
1397 continue;
1398 }
1399
1400 sdata->s_spar_map[i] = bh;
1401 }
1402 map->s_partition_func = udf_get_pblock_spar15;
1403 return 0;
1404}
1405
c0eb31ed 1406static int udf_load_logicalvol(struct super_block *sb, sector_t block,
5ca4e4be 1407 struct kernel_lb_addr *fileset)
1da177e4
LT		 1408{
1409 struct logicalVolDesc *lvd;
1df2ae31 1410 int i, offset;
1da177e4 1411 uint8_t type;
6c79e987 1412 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1413 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1414 uint16_t ident;
1415 struct buffer_head *bh;
adee11b2 1416 unsigned int table_len;
d759bfa4 1417 int ret;
1da177e4 1418
c0eb31ed
JK		 1419 bh = udf_read_tagged(sb, block, block, &ident);
1420 if (!bh)
d759bfa4 1421 return -EAGAIN;
c0eb31ed 1422 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4 1423 lvd = (struct logicalVolDesc *)bh->b_data;
adee11b2 1424 table_len = le32_to_cpu(lvd->mapTableLength);
57b9655d 1425 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
adee11b2
JK		 1426 udf_err(sb, "error loading logical volume descriptor: "
1427 "Partition table too long (%u > %lu)\n", table_len,
1428 sb->s_blocksize - sizeof(*lvd));
d759bfa4 1429 ret = -EIO;
adee11b2
JK		 1430 goto out_bh;
1431 }
1da177e4 1432
cb14d340
JK		 1433 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1434 if (ret)
c0eb31ed 1435 goto out_bh;
1da177e4 1436
cb00ea35 1437 for (i = 0, offset = 0;
adee11b2 1438 i < sbi->s_partitions && offset < table_len;
4b11111a
MS		 1439 i++, offset += gpm->partitionMapLength) {
1440 struct udf_part_map *map = &sbi->s_partmaps[i];
1441 gpm = (struct genericPartitionMap *)
1442 &(lvd->partitionMaps[offset]);
1443 type = gpm->partitionMapType;
cb00ea35 1444 if (type == 1) {
4b11111a
MS		 1445 struct genericPartitionMap1 *gpm1 =
1446 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1447 map->s_partition_type = UDF_TYPE1_MAP15;
1448 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1449 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1450 map->s_partition_func = NULL;
cb00ea35 1451 } else if (type == 2) {
4b11111a
MS		 1452 struct udfPartitionMap2 *upm2 =
1453 (struct udfPartitionMap2 *)gpm;
1454 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1455 strlen(UDF_ID_VIRTUAL))) {
1456 u16 suf =
1457 le16_to_cpu(((__le16 *)upm2->partIdent.
1458 identSuffix)[0]);
c82a1275 1459 if (suf < 0x0200) {
4b11111a
MS		 1460 map->s_partition_type =
1461 UDF_VIRTUAL_MAP15;
1462 map->s_partition_func =
1463 udf_get_pblock_virt15;
c82a1275 1464 } else {
4b11111a
MS		 1465 map->s_partition_type =
1466 UDF_VIRTUAL_MAP20;
1467 map->s_partition_func =
1468 udf_get_pblock_virt20;
1da177e4 1469 }
4b11111a
MS		 1470 } else if (!strncmp(upm2->partIdent.ident,
1471 UDF_ID_SPARABLE,
1472 strlen(UDF_ID_SPARABLE))) {
d759bfa4
JK		 1473 ret = udf_load_sparable_map(sb, map,
1474 (struct sparablePartitionMap *)gpm);
1475 if (ret < 0)
1df2ae31 1476 goto out_bh;
bfb257a5
JK		 1477 } else if (!strncmp(upm2->partIdent.ident,
1478 UDF_ID_METADATA,
1479 strlen(UDF_ID_METADATA))) {
1480 struct udf_meta_data *mdata =
1481 &map->s_type_specific.s_metadata;
1482 struct metadataPartitionMap *mdm =
1483 (struct metadataPartitionMap *)
1484 &(lvd->partitionMaps[offset]);
fcbf7637 1485 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
a983f368 1486 i, type, UDF_ID_METADATA);
bfb257a5
JK		 1487
1488 map->s_partition_type = UDF_METADATA_MAP25;
1489 map->s_partition_func = udf_get_pblock_meta25;
1490
1491 mdata->s_meta_file_loc =
1492 le32_to_cpu(mdm->metadataFileLoc);
1493 mdata->s_mirror_file_loc =
1494 le32_to_cpu(mdm->metadataMirrorFileLoc);
1495 mdata->s_bitmap_file_loc =
1496 le32_to_cpu(mdm->metadataBitmapFileLoc);
1497 mdata->s_alloc_unit_size =
1498 le32_to_cpu(mdm->allocUnitSize);
1499 mdata->s_align_unit_size =
1500 le16_to_cpu(mdm->alignUnitSize);
ed47a7d0
JK		 1501 if (mdm->flags & 0x01)
1502 mdata->s_flags |= MF_DUPLICATE_MD;
bfb257a5
JK		 1503
1504 udf_debug("Metadata Ident suffix=0x%x\n",
a983f368
JP		 1505 le16_to_cpu(*(__le16 *)
1506 mdm->partIdent.identSuffix));
fcbf7637 1507 udf_debug("Metadata part num=%u\n",
a983f368 1508 le16_to_cpu(mdm->partitionNum));
fcbf7637 1509 udf_debug("Metadata part alloc unit size=%u\n",
a983f368 1510 le32_to_cpu(mdm->allocUnitSize));
fcbf7637 1511 udf_debug("Metadata file loc=%u\n",
a983f368 1512 le32_to_cpu(mdm->metadataFileLoc));
fcbf7637 1513 udf_debug("Mirror file loc=%u\n",
a983f368 1514 le32_to_cpu(mdm->metadataMirrorFileLoc));
fcbf7637 1515 udf_debug("Bitmap file loc=%u\n",
a983f368 1516 le32_to_cpu(mdm->metadataBitmapFileLoc));
fcbf7637 1517 udf_debug("Flags: %d %u\n",
ed47a7d0 1518 mdata->s_flags, mdm->flags);
cb00ea35 1519 } else {
3a71fc5d
MS		 1520 udf_debug("Unknown ident: %s\n",
1521 upm2->partIdent.ident);
1da177e4
LT		 1522 continue;
1523 }
6c79e987
MS		 1524 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1525 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4 1526 }
fcbf7637 1527 udf_debug("Partition (%d:%u) type %u on volume %u\n",
a983f368 1528 i, map->s_partition_num, type, map->s_volumeseqnum);
1da177e4
LT		 1529 }
1530
cb00ea35 1531 if (fileset) {
5ca4e4be 1532 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1533
1534 *fileset = lelb_to_cpu(la->extLocation);
fcbf7637 1535 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
a983f368 1536 fileset->logicalBlockNum,
28de7948 1537 fileset->partitionReferenceNum);
1da177e4
LT		 1538 }
1539 if (lvd->integritySeqExt.extLength)
1540 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
d759bfa4 1541 ret = 0;
c0eb31ed
JK		 1542out_bh:
1543 brelse(bh);
1544 return ret;
1da177e4
LT		 1545}
1546
1547/*
a47241cd 1548 * Find the prevailing Logical Volume Integrity Descriptor.
1da177e4 1549 */
5ca4e4be 1550static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1da177e4 1551{
a47241cd 1552 struct buffer_head *bh, *final_bh;
1da177e4 1553 uint16_t ident;
6c79e987
MS		 1554 struct udf_sb_info *sbi = UDF_SB(sb);
1555 struct logicalVolIntegrityDesc *lvid;
a47241cd
AT		 1556 int indirections = 0;
1557
1558 while (++indirections <= UDF_MAX_LVID_NESTING) {
1559 final_bh = NULL;
1560 while (loc.extLength > 0 &&
1561 (bh = udf_read_tagged(sb, loc.extLocation,
1562 loc.extLocation, &ident))) {
1563 if (ident != TAG_IDENT_LVID) {
1564 brelse(bh);
1565 break;
1566 }
1567
1568 brelse(final_bh);
1569 final_bh = bh;
1da177e4 1570
a47241cd
AT		 1571 loc.extLength -= sb->s_blocksize;
1572 loc.extLocation++;
1573 }
cb00ea35 1574
a47241cd
AT		 1575 if (!final_bh)
1576 return;
cb00ea35 1577
a47241cd
AT		 1578 brelse(sbi->s_lvid_bh);
1579 sbi->s_lvid_bh = final_bh;
1580
1581 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1582 if (lvid->nextIntegrityExt.extLength == 0)
1583 return;
1584
1585 loc = leea_to_cpu(lvid->nextIntegrityExt);
1da177e4 1586 }
a47241cd
AT		 1587
1588 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1589 UDF_MAX_LVID_NESTING);
1590 brelse(sbi->s_lvid_bh);
1591 sbi->s_lvid_bh = NULL;
1da177e4
LT		 1592}
1593
7b78fd02
JK		 1594/*
1595 * Step for reallocation of table of partition descriptor sequence numbers.
1596 * Must be power of 2.
1597 */
1598#define PART_DESC_ALLOC_STEP 32
1599
1600struct desc_seq_scan_data {
1601 struct udf_vds_record vds[VDS_POS_LENGTH];
1602 unsigned int size_part_descs;
1603 struct udf_vds_record *part_descs_loc;
1604};
1605
1606static struct udf_vds_record *handle_partition_descriptor(
1607 struct buffer_head *bh,
1608 struct desc_seq_scan_data *data)
1609{
1610 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1611 int partnum;
1612
1613 partnum = le16_to_cpu(desc->partitionNumber);
1614 if (partnum >= data->size_part_descs) {
1615 struct udf_vds_record *new_loc;
1616 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1617
1618 new_loc = kzalloc(sizeof(*new_loc) * new_size, GFP_KERNEL);
1619 if (!new_loc)
1620 return ERR_PTR(-ENOMEM);
1621 memcpy(new_loc, data->part_descs_loc,
1622 data->size_part_descs * sizeof(*new_loc));
1623 kfree(data->part_descs_loc);
1624 data->part_descs_loc = new_loc;
1625 data->size_part_descs = new_size;
1626 }
1627 return &(data->part_descs_loc[partnum]);
1628}
1629
1630
1631static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1632 struct buffer_head *bh, struct desc_seq_scan_data *data)
18cf4781
JK		 1633{
1634 switch (ident) {
1635 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
7b78fd02 1636 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
18cf4781 1637 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
7b78fd02 1638 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
18cf4781 1639 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
7b78fd02 1640 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
18cf4781 1641 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
7b78fd02
JK		 1642 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1643 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1644 return handle_partition_descriptor(bh, data);
18cf4781
JK		 1645 }
1646 return NULL;
1647}
e7a4eb86 1648
1da177e4 1649/*
d759bfa4
JK		 1650 * Process a main/reserve volume descriptor sequence.
1651 * @block First block of first extent of the sequence.
1652 * @lastblock Lastblock of first extent of the sequence.
1653 * @fileset There we store extent containing root fileset
1da177e4 1654 *
d759bfa4
JK		 1655 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1656 * sequence
1da177e4 1657 */
d759bfa4
JK		 1658static noinline int udf_process_sequence(
1659 struct super_block *sb,
1660 sector_t block, sector_t lastblock,
1661 struct kernel_lb_addr *fileset)
1da177e4
LT		 1662{
1663 struct buffer_head *bh = NULL;
4b11111a 1664 struct udf_vds_record *curr;
1da177e4
LT		 1665 struct generic_desc *gd;
1666 struct volDescPtr *vdp;
2b8f9421 1667 bool done = false;
1da177e4
LT		 1668 uint32_t vdsn;
1669 uint16_t ident;
d759bfa4 1670 int ret;
e7a4eb86 1671 unsigned int indirections = 0;
7b78fd02
JK		 1672 struct desc_seq_scan_data data;
1673 unsigned int i;
1674
1675 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1676 data.size_part_descs = PART_DESC_ALLOC_STEP;
1677 data.part_descs_loc = kzalloc(sizeof(*data.part_descs_loc) *
1678 data.size_part_descs, GFP_KERNEL);
1679 if (!data.part_descs_loc)
1680 return -ENOMEM;
1da177e4 1681
c0eb31ed
JK		 1682 /*
1683 * Read the main descriptor sequence and find which descriptors
1684 * are in it.
1685 */
cb00ea35 1686 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1687
1688 bh = udf_read_tagged(sb, block, block, &ident);
67621675
JK		 1689 if (!bh)
1690 break;
1da177e4
LT		 1691
1692 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1693 gd = (struct generic_desc *)bh->b_data;
1694 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1695 switch (ident) {
28de7948 1696 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
7b568cba
JK		 1697 if (++indirections > UDF_MAX_TD_NESTING) {
1698 udf_err(sb, "too many Volume Descriptor "
1699 "Pointers (max %u supported)\n",
1700 UDF_MAX_TD_NESTING);
1701 brelse(bh);
1702 return -EIO;
cb00ea35 1703 }
7b568cba
JK		 1704
1705 vdp = (struct volDescPtr *)bh->b_data;
1706 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1707 lastblock = le32_to_cpu(
1708 vdp->nextVolDescSeqExt.extLength) >>
1709 sb->s_blocksize_bits;
1710 lastblock += block - 1;
1711 /* For loop is going to increment 'block' again */
1712 block--;
cb00ea35 1713 break;
18cf4781 1714 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
28de7948 1715 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
18cf4781
JK		 1716 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1717 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
7b78fd02
JK		 1718 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1719 curr = get_volume_descriptor_record(ident, bh, &data);
1720 if (IS_ERR(curr)) {
1721 brelse(bh);
1722 return PTR_ERR(curr);
1723 }
1724 /* Descriptor we don't care about? */
1725 if (!curr)
1726 break;
4b11111a
MS		 1727 if (vdsn >= curr->volDescSeqNum) {
1728 curr->volDescSeqNum = vdsn;
1729 curr->block = block;
cb00ea35
CG		 1730 }
1731 break;
28de7948 1732 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
7b568cba 1733 done = true;
cb00ea35 1734 break;
1da177e4 1735 }
3bf25cb4 1736 brelse(bh);
1da177e4 1737 }
c0eb31ed
JK		 1738 /*
1739 * Now read interesting descriptors again and process them
1740 * in a suitable order
1741 */
7b78fd02 1742 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
78ace70c 1743 udf_err(sb, "Primary Volume Descriptor not found!\n");
d759bfa4
JK		 1744 return -EAGAIN;
1745 }
7b78fd02 1746 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
d759bfa4
JK		 1747 if (ret < 0)
1748 return ret;
1749
7b78fd02 1750 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
d759bfa4 1751 ret = udf_load_logicalvol(sb,
7b78fd02
JK		 1752 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1753 fileset);
d759bfa4
JK		 1754 if (ret < 0)
1755 return ret;
c0eb31ed 1756 }
165923fa 1757
7b78fd02
JK		 1758 /* Now handle prevailing Partition Descriptors */
1759 for (i = 0; i < data.size_part_descs; i++) {
1760 if (data.part_descs_loc[i].block) {
1761 ret = udf_load_partdesc(sb,
1762 data.part_descs_loc[i].block);
d759bfa4
JK		 1763 if (ret < 0)
1764 return ret;
1765 }
1da177e4
LT		 1766 }
1767
1768 return 0;
1769}
1770
d759bfa4
JK		 1771/*
1772 * Load Volume Descriptor Sequence described by anchor in bh
1773 *
1774 * Returns <0 on error, 0 on success
1775 */
40346005
JK		 1776static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1777 struct kernel_lb_addr *fileset)
1da177e4 1778{
40346005 1779 struct anchorVolDescPtr *anchor;
d759bfa4
JK		 1780 sector_t main_s, main_e, reserve_s, reserve_e;
1781 int ret;
1da177e4 1782
40346005
JK		 1783 anchor = (struct anchorVolDescPtr *)bh->b_data;
1784
1785 /* Locate the main sequence */
1786 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1787 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1788 main_e = main_e >> sb->s_blocksize_bits;
91c9c9ec 1789 main_e += main_s - 1;
40346005
JK		 1790
1791 /* Locate the reserve sequence */
1792 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1793 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1794 reserve_e = reserve_e >> sb->s_blocksize_bits;
91c9c9ec 1795 reserve_e += reserve_s - 1;
40346005
JK		 1796
1797 /* Process the main & reserve sequences */
1798 /* responsible for finding the PartitionDesc(s) */
d759bfa4
JK		 1799 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1800 if (ret != -EAGAIN)
1801 return ret;
bff943af 1802 udf_sb_free_partitions(sb);
d759bfa4
JK		 1803 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1804 if (ret < 0) {
1805 udf_sb_free_partitions(sb);
1806 /* No sequence was OK, return -EIO */
1807 if (ret == -EAGAIN)
1808 ret = -EIO;
1809 }
1810 return ret;
1da177e4
LT		 1811}
1812
40346005
JK		 1813/*
1814 * Check whether there is an anchor block in the given block and
1815 * load Volume Descriptor Sequence if so.
d759bfa4
JK		 1816 *
1817 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1818 * block
40346005
JK		 1819 */
1820static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1821 struct kernel_lb_addr *fileset)
1197e4df 1822{
40346005
JK		 1823 struct buffer_head *bh;
1824 uint16_t ident;
1825 int ret;
1197e4df 1826
40346005
JK		 1827 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1828 udf_fixed_to_variable(block) >=
23bcda11 1829 i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
d759bfa4 1830 return -EAGAIN;
40346005
JK		 1831
1832 bh = udf_read_tagged(sb, block, block, &ident);
1833 if (!bh)
d759bfa4 1834 return -EAGAIN;
40346005
JK		 1835 if (ident != TAG_IDENT_AVDP) {
1836 brelse(bh);
d759bfa4 1837 return -EAGAIN;
1197e4df 1838 }
40346005
JK		 1839 ret = udf_load_sequence(sb, bh, fileset);
1840 brelse(bh);
1841 return ret;
1197e4df
CL		 1842}
1843
d759bfa4
JK		 1844/*
1845 * Search for an anchor volume descriptor pointer.
1846 *
1847 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1848 * of anchors.
1849 */
1850static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1851 struct kernel_lb_addr *fileset)
1da177e4 1852{
40346005 1853 sector_t last[6];
38b74a53 1854 int i;
40346005
JK		 1855 struct udf_sb_info *sbi = UDF_SB(sb);
1856 int last_count = 0;
d759bfa4 1857 int ret;
1da177e4 1858
40346005
JK		 1859 /* First try user provided anchor */
1860 if (sbi->s_anchor) {
d759bfa4
JK		 1861 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1862 if (ret != -EAGAIN)
1863 return ret;
40346005
JK		 1864 }
1865 /*
1866 * according to spec, anchor is in either:
1867 * block 256
1868 * lastblock-256
1869 * lastblock
1870 * however, if the disc isn't closed, it could be 512.
1871 */
d759bfa4
JK		 1872 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1873 if (ret != -EAGAIN)
1874 return ret;
40346005
JK		 1875 /*
1876 * The trouble is which block is the last one. Drives often misreport
1877 * this so we try various possibilities.
1878 */
d759bfa4
JK		 1879 last[last_count++] = *lastblock;
1880 if (*lastblock >= 1)
1881 last[last_count++] = *lastblock - 1;
1882 last[last_count++] = *lastblock + 1;
1883 if (*lastblock >= 2)
1884 last[last_count++] = *lastblock - 2;
1885 if (*lastblock >= 150)
1886 last[last_count++] = *lastblock - 150;
1887 if (*lastblock >= 152)
1888 last[last_count++] = *lastblock - 152;
1da177e4 1889
40346005 1890 for (i = 0; i < last_count; i++) {
23bcda11 1891 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >>
40346005 1892 sb->s_blocksize_bits)
28f7c4d4 1893 continue;
d759bfa4
JK		 1894 ret = udf_check_anchor_block(sb, last[i], fileset);
1895 if (ret != -EAGAIN) {
1896 if (!ret)
1897 *lastblock = last[i];
1898 return ret;
1899 }
40346005 1900 if (last[i] < 256)
28f7c4d4 1901 continue;
d759bfa4
JK		 1902 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1903 if (ret != -EAGAIN) {
1904 if (!ret)
1905 *lastblock = last[i];
1906 return ret;
1907 }
40346005 1908 }
28f7c4d4 1909
40346005 1910 /* Finally try block 512 in case media is open */
d759bfa4 1911 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
40346005 1912}
28f7c4d4 1913
40346005
JK		 1914/*
1915 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1916 * area specified by it. The function expects sbi->s_lastblock to be the last
1917 * block on the media.
1918 *
d759bfa4
JK		 1919 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1920 * was not found.
40346005
JK		 1921 */
1922static int udf_find_anchor(struct super_block *sb,
1923 struct kernel_lb_addr *fileset)
1924{
40346005 1925 struct udf_sb_info *sbi = UDF_SB(sb);
d759bfa4
JK		 1926 sector_t lastblock = sbi->s_last_block;
1927 int ret;
28f7c4d4 1928
d759bfa4
JK		 1929 ret = udf_scan_anchors(sb, &lastblock, fileset);
1930 if (ret != -EAGAIN)
40346005 1931 goto out;
1da177e4 1932
40346005
JK		 1933 /* No anchor found? Try VARCONV conversion of block numbers */
1934 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
d759bfa4 1935 lastblock = udf_variable_to_fixed(sbi->s_last_block);
40346005 1936 /* Firstly, we try to not convert number of the last block */
d759bfa4
JK		 1937 ret = udf_scan_anchors(sb, &lastblock, fileset);
1938 if (ret != -EAGAIN)
40346005 1939 goto out;
1da177e4 1940
d759bfa4 1941 lastblock = sbi->s_last_block;
40346005 1942 /* Secondly, we try with converted number of the last block */
d759bfa4
JK		 1943 ret = udf_scan_anchors(sb, &lastblock, fileset);
1944 if (ret < 0) {
40346005
JK		 1945 /* VARCONV didn't help. Clear it. */
1946 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1da177e4 1947 }
40346005 1948out:
d759bfa4
JK		 1949 if (ret == 0)
1950 sbi->s_last_block = lastblock;
1951 return ret;
40346005 1952}
1da177e4 1953
40346005
JK		 1954/*
1955 * Check Volume Structure Descriptor, find Anchor block and load Volume
d759bfa4
JK		 1956 * Descriptor Sequence.
1957 *
1958 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1959 * block was not found.
40346005
JK		 1960 */
1961static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1962 int silent, struct kernel_lb_addr *fileset)
1963{
1964 struct udf_sb_info *sbi = UDF_SB(sb);
1965 loff_t nsr_off;
d759bfa4 1966 int ret;
40346005
JK		 1967
1968 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1969 if (!silent)
78ace70c 1970 udf_warn(sb, "Bad block size\n");
d759bfa4 1971 return -EINVAL;
40346005
JK		 1972 }
1973 sbi->s_last_block = uopt->lastblock;
1974 if (!uopt->novrs) {
1975 /* Check that it is NSR02 compliant */
1976 nsr_off = udf_check_vsd(sb);
1977 if (!nsr_off) {
1978 if (!silent)
78ace70c 1979 udf_warn(sb, "No VRS found\n");
70f16cef 1980 return -EINVAL;
40346005
JK		 1981 }
1982 if (nsr_off == -1)
44499602
PF		 1983 udf_debug("Failed to read sector at offset %d. "
1984 "Assuming open disc. Skipping validity "
1985 "check\n", VSD_FIRST_SECTOR_OFFSET);
40346005
JK		 1986 if (!sbi->s_last_block)
1987 sbi->s_last_block = udf_get_last_block(sb);
1988 } else {
1989 udf_debug("Validity check skipped because of novrs option\n");
28f7c4d4 1990 }
1da177e4 1991
40346005
JK		 1992 /* Look for anchor block and load Volume Descriptor Sequence */
1993 sbi->s_anchor = uopt->anchor;
d759bfa4
JK		 1994 ret = udf_find_anchor(sb, fileset);
1995 if (ret < 0) {
1996 if (!silent && ret == -EAGAIN)
78ace70c 1997 udf_warn(sb, "No anchor found\n");
d759bfa4 1998 return ret;
40346005 1999 }
d759bfa4 2000 return 0;
1da177e4
LT		 2001}
2002
2003static void udf_open_lvid(struct super_block *sb)
2004{
6c79e987
MS		 2005 struct udf_sb_info *sbi = UDF_SB(sb);
2006 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 2007 struct logicalVolIntegrityDesc *lvid;
2008 struct logicalVolIntegrityDescImpUse *lvidiu;
88b50ce3 2009 struct timespec ts;
146bca72 2010
165923fa
MS		 2011 if (!bh)
2012 return;
165923fa 2013 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
69d75671
JK		 2014 lvidiu = udf_sb_lvidiu(sb);
2015 if (!lvidiu)
2016 return;
165923fa 2017
69d75671 2018 mutex_lock(&sbi->s_alloc_mutex);
165923fa
MS		 2019 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2020 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
88b50ce3
DD		 2021 ktime_get_real_ts(&ts);
2022 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
146bca72 2023 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
165923fa
MS		 2024
2025 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 2026 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 2027 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 2028
2029 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2030 mark_buffer_dirty(bh);
146bca72 2031 sbi->s_lvid_dirty = 0;
949f4a7c 2032 mutex_unlock(&sbi->s_alloc_mutex);
9734c971
JK		 2033 /* Make opening of filesystem visible on the media immediately */
2034 sync_dirty_buffer(bh);
1da177e4
LT		 2035}
2036
2037static void udf_close_lvid(struct super_block *sb)
2038{
6c79e987
MS		 2039 struct udf_sb_info *sbi = UDF_SB(sb);
2040 struct buffer_head *bh = sbi->s_lvid_bh;
2041 struct logicalVolIntegrityDesc *lvid;
165923fa 2042 struct logicalVolIntegrityDescImpUse *lvidiu;
88b50ce3 2043 struct timespec ts;
28de7948 2044
6c79e987
MS		 2045 if (!bh)
2046 return;
69d75671
JK		 2047 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2048 lvidiu = udf_sb_lvidiu(sb);
2049 if (!lvidiu)
2050 return;
6c79e987 2051
949f4a7c 2052 mutex_lock(&sbi->s_alloc_mutex);
165923fa
MS		 2053 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2054 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
88b50ce3
DD		 2055 ktime_get_real_ts(&ts);
2056 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
165923fa
MS		 2057 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2058 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2059 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2060 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2061 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2062 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2063 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2064
2065 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 2066 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 2067 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 2068
2069 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
853a0c25
JK		 2070 /*
2071 * We set buffer uptodate unconditionally here to avoid spurious
2072 * warnings from mark_buffer_dirty() when previous EIO has marked
2073 * the buffer as !uptodate
2074 */
2075 set_buffer_uptodate(bh);
165923fa 2076 mark_buffer_dirty(bh);
146bca72 2077 sbi->s_lvid_dirty = 0;
949f4a7c 2078 mutex_unlock(&sbi->s_alloc_mutex);
9734c971
JK		 2079 /* Make closing of filesystem visible on the media immediately */
2080 sync_dirty_buffer(bh);
1da177e4
LT		 2081}
2082
d664b6af
JK		 2083u64 lvid_get_unique_id(struct super_block *sb)
2084{
2085 struct buffer_head *bh;
2086 struct udf_sb_info *sbi = UDF_SB(sb);
2087 struct logicalVolIntegrityDesc *lvid;
2088 struct logicalVolHeaderDesc *lvhd;
2089 u64 uniqueID;
2090 u64 ret;
2091
2092 bh = sbi->s_lvid_bh;
2093 if (!bh)
2094 return 0;
2095
2096 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2097 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2098
2099 mutex_lock(&sbi->s_alloc_mutex);
2100 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2101 if (!(++uniqueID & 0xFFFFFFFF))
2102 uniqueID += 16;
2103 lvhd->uniqueID = cpu_to_le64(uniqueID);
2104 mutex_unlock(&sbi->s_alloc_mutex);
2105 mark_buffer_dirty(bh);
2106
2107 return ret;
1da177e4
LT		 2108}
2109
1da177e4
LT		 2110static int udf_fill_super(struct super_block *sb, void *options, int silent)
2111{
d759bfa4 2112 int ret = -EINVAL;
cb00ea35 2113 struct inode *inode = NULL;
1da177e4 2114 struct udf_options uopt;
5ca4e4be 2115 struct kernel_lb_addr rootdir, fileset;
1da177e4 2116 struct udf_sb_info *sbi;
9181f8bf 2117 bool lvid_open = false;
1da177e4
LT		 2118
2119 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
c2ba138a
EB		 2120 uopt.uid = INVALID_UID;
2121 uopt.gid = INVALID_GID;
1da177e4 2122 uopt.umask = 0;
87bc730c
MS		 2123 uopt.fmode = UDF_INVALID_MODE;
2124 uopt.dmode = UDF_INVALID_MODE;
1da177e4 2125
033c9da0 2126 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
9db9f9e3 2127 if (!sbi)
1da177e4 2128 return -ENOMEM;
28de7948 2129
1da177e4 2130 sb->s_fs_info = sbi;
1da177e4 2131
1e7933de 2132 mutex_init(&sbi->s_alloc_mutex);
1da177e4 2133
6da80894 2134 if (!udf_parse_options((char *)options, &uopt, false))
fdf2657b 2135 goto parse_options_failure;
1da177e4
LT		 2136
2137 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 2138 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
8076c363 2139 udf_err(sb, "utf8 cannot be combined with iocharset\n");
fdf2657b 2140 goto parse_options_failure;
1da177e4
LT		 2141 }
2142#ifdef CONFIG_UDF_NLS
cb00ea35 2143 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 2144 uopt.nls_map = load_nls_default();
2145 if (!uopt.nls_map)
2146 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2147 else
2148 udf_debug("Using default NLS map\n");
2149 }
2150#endif
2151 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2152 uopt.flags |= (1 << UDF_FLAG_UTF8);
2153
2154 fileset.logicalBlockNum = 0xFFFFFFFF;
2155 fileset.partitionReferenceNum = 0xFFFF;
2156
6c79e987
MS		 2157 sbi->s_flags = uopt.flags;
2158 sbi->s_uid = uopt.uid;
2159 sbi->s_gid = uopt.gid;
2160 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 2161 sbi->s_fmode = uopt.fmode;
2162 sbi->s_dmode = uopt.dmode;
6c79e987 2163 sbi->s_nls_map = uopt.nls_map;
c03cad24 2164 rwlock_init(&sbi->s_cred_lock);
1da177e4 2165
cb00ea35 2166 if (uopt.session == 0xFFFFFFFF)
6c79e987 2167 sbi->s_session = udf_get_last_session(sb);
1da177e4 2168 else
6c79e987 2169 sbi->s_session = uopt.session;
1da177e4 2170
6c79e987 2171 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 2172
40346005
JK		 2173 /* Fill in the rest of the superblock */
2174 sb->s_op = &udf_sb_ops;
2175 sb->s_export_op = &udf_export_ops;
123e9caf 2176
40346005
JK		 2177 sb->s_magic = UDF_SUPER_MAGIC;
2178 sb->s_time_gran = 1000;
2179
1197e4df 2180 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
40346005 2181 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 2182 } else {
e1defc4f 2183 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
70f16cef 2184 while (uopt.blocksize <= 4096) {
40346005 2185 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
70f16cef
FF		 2186 if (ret < 0) {
2187 if (!silent && ret != -EACCES) {
fcbf7637 2188 pr_notice("Scanning with blocksize %u failed\n",
70f16cef
FF		 2189 uopt.blocksize);
2190 }
2191 brelse(sbi->s_lvid_bh);
2192 sbi->s_lvid_bh = NULL;
2193 /*
2194 * EACCES is special - we want to propagate to
2195 * upper layers that we cannot handle RW mount.
2196 */
2197 if (ret == -EACCES)
2198 break;
2199 } else
2200 break;
2201
2202 uopt.blocksize <<= 1;
1197e4df 2203 }
1da177e4 2204 }
d759bfa4
JK		 2205 if (ret < 0) {
2206 if (ret == -EAGAIN) {
2207 udf_warn(sb, "No partition found (1)\n");
2208 ret = -EINVAL;
2209 }
1da177e4
LT		 2210 goto error_out;
2211 }
2212
fcbf7637 2213 udf_debug("Lastblock=%u\n", sbi->s_last_block);
1da177e4 2214
6c79e987 2215 if (sbi->s_lvid_bh) {
4b11111a 2216 struct logicalVolIntegrityDescImpUse *lvidiu =
69d75671
JK		 2217 udf_sb_lvidiu(sb);
2218 uint16_t minUDFReadRev;
2219 uint16_t minUDFWriteRev;
1da177e4 2220
69d75671
JK		 2221 if (!lvidiu) {
2222 ret = -EINVAL;
2223 goto error_out;
2224 }
2225 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2226 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
cb00ea35 2227 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
78ace70c 2228 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
69d75671 2229 minUDFReadRev,
78ace70c 2230 UDF_MAX_READ_VERSION);
d759bfa4 2231 ret = -EINVAL;
1da177e4 2232 goto error_out;
e729eac6 2233 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
bc98a42c 2234 !sb_rdonly(sb)) {
e729eac6
JK		 2235 ret = -EACCES;
2236 goto error_out;
2237 }
1da177e4 2238
6c79e987 2239 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 2240
2241 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2242 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2243 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2244 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2245 }
2246
6c79e987 2247 if (!sbi->s_partitions) {
78ace70c 2248 udf_warn(sb, "No partition found (2)\n");
d759bfa4 2249 ret = -EINVAL;
1da177e4
LT		 2250 goto error_out;
2251 }
2252
4b11111a 2253 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
e729eac6 2254 UDF_PART_FLAG_READ_ONLY &&
bc98a42c 2255 !sb_rdonly(sb)) {
e729eac6
JK		 2256 ret = -EACCES;
2257 goto error_out;
c1a26e7d 2258 }
39b3f6d6 2259
cb00ea35 2260 if (udf_find_fileset(sb, &fileset, &rootdir)) {
78ace70c 2261 udf_warn(sb, "No fileset found\n");
d759bfa4 2262 ret = -EINVAL;
1da177e4
LT		 2263 goto error_out;
2264 }
2265
cb00ea35 2266 if (!silent) {
5ca4e4be 2267 struct timestamp ts;
56774805 2268 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
78ace70c
JP		 2269 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2270 sbi->s_volume_ident,
2271 le16_to_cpu(ts.year), ts.month, ts.day,
56774805 2272 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4 2273 }
bc98a42c 2274 if (!sb_rdonly(sb)) {
1da177e4 2275 udf_open_lvid(sb);
9181f8bf
JK		 2276 lvid_open = true;
2277 }
1da177e4
LT		 2278
2279 /* Assign the root inode */
2280 /* assign inodes by physical block number */
2281 /* perhaps it's not extensible enough, but for now ... */
97e961fd 2282 inode = udf_iget(sb, &rootdir);
6d3d5e86 2283 if (IS_ERR(inode)) {
fcbf7637 2284 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
cb00ea35 2285 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
6d3d5e86 2286 ret = PTR_ERR(inode);
1da177e4
LT		 2287 goto error_out;
2288 }
2289
2290 /* Allocate a dentry for the root inode */
48fde701 2291 sb->s_root = d_make_root(inode);
cb00ea35 2292 if (!sb->s_root) {
78ace70c 2293 udf_err(sb, "Couldn't allocate root dentry\n");
d759bfa4 2294 ret = -ENOMEM;
1da177e4
LT		 2295 goto error_out;
2296 }
31170b6a 2297 sb->s_maxbytes = MAX_LFS_FILESIZE;
8de52778 2298 sb->s_max_links = UDF_MAX_LINKS;
1da177e4
LT		 2299 return 0;
2300
28de7948 2301error_out:
0d454e4a 2302 iput(sbi->s_vat_inode);
fdf2657b 2303parse_options_failure:
1da177e4
LT		 2304#ifdef CONFIG_UDF_NLS
2305 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2306 unload_nls(sbi->s_nls_map);
1da177e4 2307#endif
9181f8bf 2308 if (lvid_open)
1da177e4 2309 udf_close_lvid(sb);
6c79e987 2310 brelse(sbi->s_lvid_bh);
bff943af 2311 udf_sb_free_partitions(sb);
1da177e4
LT		 2312 kfree(sbi);
2313 sb->s_fs_info = NULL;
28de7948 2314
d759bfa4 2315 return ret;
1da177e4
LT		 2316}
2317
8076c363
JP		 2318void _udf_err(struct super_block *sb, const char *function,
2319 const char *fmt, ...)
1da177e4 2320{
c2bff36c 2321 struct va_format vaf;
1da177e4
LT		 2322 va_list args;
2323
1da177e4 2324 va_start(args, fmt);
c2bff36c
JP		 2325
2326 vaf.fmt = fmt;
2327 vaf.va = &args;
2328
2329 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2330
1da177e4 2331 va_end(args);
1da177e4
LT		 2332}
2333
a40ecd7b
JP		 2334void _udf_warn(struct super_block *sb, const char *function,
2335 const char *fmt, ...)
1da177e4 2336{
c2bff36c 2337 struct va_format vaf;
1da177e4
LT		 2338 va_list args;
2339
cb00ea35 2340 va_start(args, fmt);
c2bff36c
JP		 2341
2342 vaf.fmt = fmt;
2343 vaf.va = &args;
2344
2345 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2346
1da177e4 2347 va_end(args);
1da177e4
LT		 2348}
2349
cb00ea35 2350static void udf_put_super(struct super_block *sb)
1da177e4 2351{
6c79e987 2352 struct udf_sb_info *sbi;
1da177e4 2353
6c79e987 2354 sbi = UDF_SB(sb);
6cfd0148 2355
0d454e4a 2356 iput(sbi->s_vat_inode);
1da177e4
LT		 2357#ifdef CONFIG_UDF_NLS
2358 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2359 unload_nls(sbi->s_nls_map);
1da177e4 2360#endif
bc98a42c 2361 if (!sb_rdonly(sb))
1da177e4 2362 udf_close_lvid(sb);
6c79e987 2363 brelse(sbi->s_lvid_bh);
bff943af 2364 udf_sb_free_partitions(sb);
bbe48dd8 2365 mutex_destroy(&sbi->s_alloc_mutex);
1da177e4
LT		 2366 kfree(sb->s_fs_info);
2367 sb->s_fs_info = NULL;
2368}
2369
146bca72
JK		 2370static int udf_sync_fs(struct super_block *sb, int wait)
2371{
2372 struct udf_sb_info *sbi = UDF_SB(sb);
2373
2374 mutex_lock(&sbi->s_alloc_mutex);
2375 if (sbi->s_lvid_dirty) {
2376 /*
2377 * Blockdevice will be synced later so we don't have to submit
2378 * the buffer for IO
2379 */
2380 mark_buffer_dirty(sbi->s_lvid_bh);
146bca72
JK		 2381 sbi->s_lvid_dirty = 0;
2382 }
2383 mutex_unlock(&sbi->s_alloc_mutex);
2384
2385 return 0;
2386}
2387
cb00ea35 2388static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 2389{
726c3342 2390 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 2391 struct udf_sb_info *sbi = UDF_SB(sb);
2392 struct logicalVolIntegrityDescImpUse *lvidiu;
557f5a14 2393 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
6c79e987 2394
69d75671 2395 lvidiu = udf_sb_lvidiu(sb);
1da177e4
LT		 2396 buf->f_type = UDF_SUPER_MAGIC;
2397 buf->f_bsize = sb->s_blocksize;
6c79e987 2398 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 2399 buf->f_bfree = udf_count_free(sb);
2400 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 2401 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2402 le32_to_cpu(lvidiu->numDirs)) : 0)
2403 + buf->f_bfree;
1da177e4 2404 buf->f_ffree = buf->f_bfree;
9fba7056 2405 buf->f_namelen = UDF_NAME_LEN;
557f5a14
CL		 2406 buf->f_fsid.val[0] = (u32)id;
2407 buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4
LT		 2408
2409 return 0;
2410}
2411
4b11111a
MS		 2412static unsigned int udf_count_free_bitmap(struct super_block *sb,
2413 struct udf_bitmap *bitmap)
1da177e4
LT		 2414{
2415 struct buffer_head *bh = NULL;
2416 unsigned int accum = 0;
2417 int index;
b490bdd6 2418 udf_pblk_t block = 0, newblock;
5ca4e4be 2419 struct kernel_lb_addr loc;
1da177e4 2420 uint32_t bytes;
1da177e4
LT		 2421 uint8_t *ptr;
2422 uint16_t ident;
2423 struct spaceBitmapDesc *bm;
2424
1da177e4 2425 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 2426 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
97e961fd 2427 bh = udf_read_ptagged(sb, &loc, 0, &ident);
1da177e4 2428
cb00ea35 2429 if (!bh) {
78ace70c 2430 udf_err(sb, "udf_count_free failed\n");
1da177e4 2431 goto out;
cb00ea35 2432 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 2433 brelse(bh);
78ace70c 2434 udf_err(sb, "udf_count_free failed\n");
1da177e4
LT		 2435 goto out;
2436 }
2437
2438 bm = (struct spaceBitmapDesc *)bh->b_data;
2439 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 2440 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2441 ptr = (uint8_t *)bh->b_data;
1da177e4 2442
cb00ea35 2443 while (bytes > 0) {
01b954a3
MS		 2444 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2445 accum += bitmap_weight((const unsigned long *)(ptr + index),
2446 cur_bytes * 8);
2447 bytes -= cur_bytes;
cb00ea35 2448 if (bytes) {
3bf25cb4 2449 brelse(bh);
97e961fd 2450 newblock = udf_get_lb_pblock(sb, &loc, ++block);
1da177e4 2451 bh = udf_tread(sb, newblock);
cb00ea35 2452 if (!bh) {
1da177e4
LT		 2453 udf_debug("read failed\n");
2454 goto out;
2455 }
2456 index = 0;
28de7948 2457 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2458 }
2459 }
3bf25cb4 2460 brelse(bh);
28de7948 2461out:
1da177e4
LT		 2462 return accum;
2463}
2464
4b11111a
MS		 2465static unsigned int udf_count_free_table(struct super_block *sb,
2466 struct inode *table)
1da177e4
LT		 2467{
2468 unsigned int accum = 0;
ff116fc8 2469 uint32_t elen;
5ca4e4be 2470 struct kernel_lb_addr eloc;
1da177e4 2471 int8_t etype;
ff116fc8 2472 struct extent_position epos;
1da177e4 2473
d1668fe3 2474 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
c0b34438 2475 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2476 epos.offset = sizeof(struct unallocSpaceEntry);
2477 epos.bh = NULL;
1da177e4 2478
3a71fc5d 2479 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2480 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2481
3bf25cb4 2482 brelse(epos.bh);
d1668fe3 2483 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
1da177e4
LT		 2484
2485 return accum;
2486}
cb00ea35
CG		 2487
2488static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2489{
2490 unsigned int accum = 0;
6c79e987
MS		 2491 struct udf_sb_info *sbi;
2492 struct udf_part_map *map;
1da177e4 2493
6c79e987
MS		 2494 sbi = UDF_SB(sb);
2495 if (sbi->s_lvid_bh) {
4b11111a
MS		 2496 struct logicalVolIntegrityDesc *lvid =
2497 (struct logicalVolIntegrityDesc *)
2498 sbi->s_lvid_bh->b_data;
6c79e987 2499 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2500 accum = le32_to_cpu(
2501 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2502 if (accum == 0xFFFFFFFF)
2503 accum = 0;
2504 }
2505 }
2506
2507 if (accum)
2508 return accum;
2509
6c79e987
MS		 2510 map = &sbi->s_partmaps[sbi->s_partition];
2511 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2512 accum += udf_count_free_bitmap(sb,
6c79e987 2513 map->s_uspace.s_bitmap);
1da177e4 2514 }
6c79e987 2515 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2516 accum += udf_count_free_bitmap(sb,
6c79e987 2517 map->s_fspace.s_bitmap);
1da177e4
LT		 2518 }
2519 if (accum)
2520 return accum;
2521
6c79e987 2522 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2523 accum += udf_count_free_table(sb,
6c79e987 2524 map->s_uspace.s_table);
1da177e4 2525 }
6c79e987 2526 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2527 accum += udf_count_free_table(sb,
6c79e987 2528 map->s_fspace.s_table);
1da177e4
LT		 2529 }
2530
2531 return accum;
2532}
54bb60d5
FF		 2533
2534MODULE_AUTHOR("Ben Fennema");
2535MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2536MODULE_LICENSE("GPL");
2537module_init(init_udf_fs)
2538module_exit(exit_udf_fs)
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