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Merge tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.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
6da80894
MS		 76#define UDF_DEFAULT_BLOCKSIZE 2048
77
44499602
PF		 78#define VSD_FIRST_SECTOR_OFFSET 32768
79#define VSD_MAX_SECTOR_OFFSET 0x800000
80
a47241cd
AT		 81/*
82 * Maximum number of Terminating Descriptor / Logical Volume Integrity
83 * Descriptor redirections. The chosen numbers are arbitrary - just that we
84 * hopefully don't limit any real use of rewritten inode on write-once media
85 * but avoid looping for too long on corrupted media.
86 */
87#define UDF_MAX_TD_NESTING 64
88#define UDF_MAX_LVID_NESTING 1000
89
8de52778
AV		 90enum { UDF_MAX_LINKS = 0xffff };
91
1da177e4
LT		 92/* These are the "meat" - everything else is stuffing */
93static int udf_fill_super(struct super_block *, void *, int);
94static void udf_put_super(struct super_block *);
146bca72 95static int udf_sync_fs(struct super_block *, int);
1da177e4 96static int udf_remount_fs(struct super_block *, int *, char *);
5ca4e4be 97static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
5ca4e4be
PE		 98static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
99 struct kernel_lb_addr *);
cb00ea35 100static void udf_load_fileset(struct super_block *, struct buffer_head *,
5ca4e4be 101 struct kernel_lb_addr *);
1da177e4
LT		 102static void udf_open_lvid(struct super_block *);
103static void udf_close_lvid(struct super_block *);
104static unsigned int udf_count_free(struct super_block *);
726c3342 105static int udf_statfs(struct dentry *, struct kstatfs *);
34c80b1d 106static int udf_show_options(struct seq_file *, struct dentry *);
1da177e4 107
69d75671 108struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
6c79e987 109{
69d75671
JK		 110 struct logicalVolIntegrityDesc *lvid;
111 unsigned int partnum;
112 unsigned int offset;
113
114 if (!UDF_SB(sb)->s_lvid_bh)
115 return NULL;
116 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
117 partnum = le32_to_cpu(lvid->numOfPartitions);
118 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
119 offsetof(struct logicalVolIntegrityDesc, impUse)) /
120 (2 * sizeof(uint32_t)) < partnum) {
121 udf_err(sb, "Logical volume integrity descriptor corrupted "
122 "(numOfPartitions = %u)!\n", partnum);
123 return NULL;
124 }
125 /* The offset is to skip freeSpaceTable and sizeTable arrays */
126 offset = partnum * 2 * sizeof(uint32_t);
6c79e987
MS		 127 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
128}
129
1da177e4 130/* UDF filesystem type */
152a0836
AV		 131static struct dentry *udf_mount(struct file_system_type *fs_type,
132 int flags, const char *dev_name, void *data)
1da177e4 133{
152a0836 134 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
1da177e4
LT		 135}
136
137static struct file_system_type udf_fstype = {
28de7948
CG		 138 .owner = THIS_MODULE,
139 .name = "udf",
152a0836 140 .mount = udf_mount,
28de7948
CG		 141 .kill_sb = kill_block_super,
142 .fs_flags = FS_REQUIRES_DEV,
1da177e4 143};
3e64fe5b 144MODULE_ALIAS_FS("udf");
1da177e4 145
cb00ea35 146static struct kmem_cache *udf_inode_cachep;
1da177e4
LT		 147
148static struct inode *udf_alloc_inode(struct super_block *sb)
149{
150 struct udf_inode_info *ei;
3a71fc5d 151 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
1da177e4
LT		 152 if (!ei)
153 return NULL;
95f8797f
DB		 154
155 ei->i_unique = 0;
156 ei->i_lenExtents = 0;
157 ei->i_next_alloc_block = 0;
158 ei->i_next_alloc_goal = 0;
159 ei->i_strat4096 = 0;
4d0fb621 160 init_rwsem(&ei->i_data_sem);
99600051
NJ		 161 ei->cached_extent.lstart = -1;
162 spin_lock_init(&ei->i_extent_cache_lock);
95f8797f 163
1da177e4
LT		 164 return &ei->vfs_inode;
165}
166
fa0d7e3d 167static void udf_i_callback(struct rcu_head *head)
1da177e4 168{
fa0d7e3d 169 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 170 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
171}
172
fa0d7e3d
NP		 173static void udf_destroy_inode(struct inode *inode)
174{
175 call_rcu(&inode->i_rcu, udf_i_callback);
176}
177
51cc5068 178static void init_once(void *foo)
1da177e4 179{
cb00ea35 180 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
1da177e4 181
a35afb83
CL		 182 ei->i_ext.i_data = NULL;
183 inode_init_once(&ei->vfs_inode);
1da177e4
LT		 184}
185
53ea18de 186static int __init init_inodecache(void)
1da177e4
LT		 187{
188 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
189 sizeof(struct udf_inode_info),
cb00ea35 190 0, (SLAB_RECLAIM_ACCOUNT |
5d097056
VD		 191 SLAB_MEM_SPREAD |
192 SLAB_ACCOUNT),
20c2df83 193 init_once);
28de7948 194 if (!udf_inode_cachep)
1da177e4
LT		 195 return -ENOMEM;
196 return 0;
197}
198
199static void destroy_inodecache(void)
200{
8c0a8537
KS		 201 /*
202 * Make sure all delayed rcu free inodes are flushed before we
203 * destroy cache.
204 */
205 rcu_barrier();
1a1d92c1 206 kmem_cache_destroy(udf_inode_cachep);
1da177e4
LT		 207}
208
209/* Superblock operations */
ee9b6d61 210static const struct super_operations udf_sb_ops = {
28de7948
CG		 211 .alloc_inode = udf_alloc_inode,
212 .destroy_inode = udf_destroy_inode,
213 .write_inode = udf_write_inode,
3aac2b62 214 .evict_inode = udf_evict_inode,
28de7948 215 .put_super = udf_put_super,
146bca72 216 .sync_fs = udf_sync_fs,
28de7948
CG		 217 .statfs = udf_statfs,
218 .remount_fs = udf_remount_fs,
6da80894 219 .show_options = udf_show_options,
1da177e4
LT		 220};
221
cb00ea35 222struct udf_options {
1da177e4
LT		 223 unsigned char novrs;
224 unsigned int blocksize;
225 unsigned int session;
226 unsigned int lastblock;
227 unsigned int anchor;
228 unsigned int volume;
229 unsigned short partition;
230 unsigned int fileset;
231 unsigned int rootdir;
232 unsigned int flags;
faa17292 233 umode_t umask;
c2ba138a
EB		 234 kgid_t gid;
235 kuid_t uid;
faa17292
AV		 236 umode_t fmode;
237 umode_t dmode;
1da177e4
LT		 238 struct nls_table *nls_map;
239};
240
241static int __init init_udf_fs(void)
242{
243 int err;
28de7948 244
1da177e4
LT		 245 err = init_inodecache();
246 if (err)
247 goto out1;
248 err = register_filesystem(&udf_fstype);
249 if (err)
250 goto out;
28de7948 251
1da177e4 252 return 0;
28de7948
CG		 253
254out:
1da177e4 255 destroy_inodecache();
28de7948
CG		 256
257out1:
1da177e4
LT		 258 return err;
259}
260
261static void __exit exit_udf_fs(void)
262{
263 unregister_filesystem(&udf_fstype);
264 destroy_inodecache();
265}
266
267module_init(init_udf_fs)
28de7948 268module_exit(exit_udf_fs)
1da177e4 269
dc5d39be
MS		 270static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
271{
272 struct udf_sb_info *sbi = UDF_SB(sb);
273
274 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
275 GFP_KERNEL);
276 if (!sbi->s_partmaps) {
8076c363
JP		 277 udf_err(sb, "Unable to allocate space for %d partition maps\n",
278 count);
dc5d39be
MS		 279 sbi->s_partitions = 0;
280 return -ENOMEM;
281 }
282
283 sbi->s_partitions = count;
284 return 0;
285}
286
bff943af
JK		 287static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
288{
289 int i;
290 int nr_groups = bitmap->s_nr_groups;
bff943af
JK		 291
292 for (i = 0; i < nr_groups; i++)
293 if (bitmap->s_block_bitmap[i])
294 brelse(bitmap->s_block_bitmap[i]);
295
1d5cfdb0 296 kvfree(bitmap);
bff943af
JK		 297}
298
299static void udf_free_partition(struct udf_part_map *map)
300{
301 int i;
302 struct udf_meta_data *mdata;
303
304 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
305 iput(map->s_uspace.s_table);
306 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
307 iput(map->s_fspace.s_table);
308 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
309 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
310 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
311 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
312 if (map->s_partition_type == UDF_SPARABLE_MAP15)
313 for (i = 0; i < 4; i++)
314 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
315 else if (map->s_partition_type == UDF_METADATA_MAP25) {
316 mdata = &map->s_type_specific.s_metadata;
317 iput(mdata->s_metadata_fe);
318 mdata->s_metadata_fe = NULL;
319
320 iput(mdata->s_mirror_fe);
321 mdata->s_mirror_fe = NULL;
322
323 iput(mdata->s_bitmap_fe);
324 mdata->s_bitmap_fe = NULL;
325 }
326}
327
328static void udf_sb_free_partitions(struct super_block *sb)
329{
330 struct udf_sb_info *sbi = UDF_SB(sb);
331 int i;
1b1baff6
NJ		 332 if (sbi->s_partmaps == NULL)
333 return;
bff943af
JK		 334 for (i = 0; i < sbi->s_partitions; i++)
335 udf_free_partition(&sbi->s_partmaps[i]);
336 kfree(sbi->s_partmaps);
337 sbi->s_partmaps = NULL;
338}
339
34c80b1d 340static int udf_show_options(struct seq_file *seq, struct dentry *root)
6da80894 341{
34c80b1d 342 struct super_block *sb = root->d_sb;
6da80894
MS		 343 struct udf_sb_info *sbi = UDF_SB(sb);
344
345 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
346 seq_puts(seq, ",nostrict");
1197e4df 347 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
6da80894
MS		 348 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
349 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
350 seq_puts(seq, ",unhide");
351 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
352 seq_puts(seq, ",undelete");
353 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
354 seq_puts(seq, ",noadinicb");
355 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
356 seq_puts(seq, ",shortad");
357 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
358 seq_puts(seq, ",uid=forget");
359 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
360 seq_puts(seq, ",uid=ignore");
361 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
362 seq_puts(seq, ",gid=forget");
363 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
364 seq_puts(seq, ",gid=ignore");
365 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
c2ba138a 366 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
6da80894 367 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
c2ba138a 368 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
6da80894 369 if (sbi->s_umask != 0)
faa17292 370 seq_printf(seq, ",umask=%ho", sbi->s_umask);
87bc730c 371 if (sbi->s_fmode != UDF_INVALID_MODE)
faa17292 372 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
87bc730c 373 if (sbi->s_dmode != UDF_INVALID_MODE)
faa17292 374 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
6da80894
MS		 375 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
376 seq_printf(seq, ",session=%u", sbi->s_session);
377 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
378 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
40346005
JK		 379 if (sbi->s_anchor != 0)
380 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
6da80894
MS		 381 /*
382 * volume, partition, fileset and rootdir seem to be ignored
383 * currently
384 */
385 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
386 seq_puts(seq, ",utf8");
387 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
388 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
389
390 return 0;
391}
392
1da177e4
LT		 393/*
394 * udf_parse_options
395 *
396 * PURPOSE
397 * Parse mount options.
398 *
399 * DESCRIPTION
400 * The following mount options are supported:
401 *
402 * gid= Set the default group.
403 * umask= Set the default umask.
7ac9bcd5
MS		 404 * mode= Set the default file permissions.
405 * dmode= Set the default directory permissions.
1da177e4
LT		 406 * uid= Set the default user.
407 * bs= Set the block size.
408 * unhide Show otherwise hidden files.
409 * undelete Show deleted files in lists.
410 * adinicb Embed data in the inode (default)
411 * noadinicb Don't embed data in the inode
412 * shortad Use short ad's
413 * longad Use long ad's (default)
414 * nostrict Unset strict conformance
415 * iocharset= Set the NLS character set
416 *
417 * The remaining are for debugging and disaster recovery:
418 *
28de7948 419 * novrs Skip volume sequence recognition
1da177e4
LT		 420 *
421 * The following expect a offset from 0.
422 *
423 * session= Set the CDROM session (default= last session)
424 * anchor= Override standard anchor location. (default= 256)
425 * volume= Override the VolumeDesc location. (unused)
426 * partition= Override the PartitionDesc location. (unused)
427 * lastblock= Set the last block of the filesystem/
428 *
429 * The following expect a offset from the partition root.
430 *
431 * fileset= Override the fileset block location. (unused)
432 * rootdir= Override the root directory location. (unused)
433 * WARNING: overriding the rootdir to a non-directory may
434 * yield highly unpredictable results.
435 *
436 * PRE-CONDITIONS
437 * options Pointer to mount options string.
438 * uopts Pointer to mount options variable.
439 *
440 * POST-CONDITIONS
441 * <return> 1 Mount options parsed okay.
442 * <return> 0 Error parsing mount options.
443 *
444 * HISTORY
445 * July 1, 1997 - Andrew E. Mileski
446 * Written, tested, and released.
447 */
28de7948 448
1da177e4
LT		 449enum {
450 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
451 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
452 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
453 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
454 Opt_rootdir, Opt_utf8, Opt_iocharset,
7ac9bcd5
MS		 455 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
456 Opt_fmode, Opt_dmode
1da177e4
LT		 457};
458
a447c093 459static const match_table_t tokens = {
28de7948
CG		 460 {Opt_novrs, "novrs"},
461 {Opt_nostrict, "nostrict"},
462 {Opt_bs, "bs=%u"},
463 {Opt_unhide, "unhide"},
464 {Opt_undelete, "undelete"},
465 {Opt_noadinicb, "noadinicb"},
466 {Opt_adinicb, "adinicb"},
467 {Opt_shortad, "shortad"},
468 {Opt_longad, "longad"},
469 {Opt_uforget, "uid=forget"},
470 {Opt_uignore, "uid=ignore"},
471 {Opt_gforget, "gid=forget"},
472 {Opt_gignore, "gid=ignore"},
473 {Opt_gid, "gid=%u"},
474 {Opt_uid, "uid=%u"},
475 {Opt_umask, "umask=%o"},
476 {Opt_session, "session=%u"},
477 {Opt_lastblock, "lastblock=%u"},
478 {Opt_anchor, "anchor=%u"},
479 {Opt_volume, "volume=%u"},
480 {Opt_partition, "partition=%u"},
481 {Opt_fileset, "fileset=%u"},
482 {Opt_rootdir, "rootdir=%u"},
483 {Opt_utf8, "utf8"},
484 {Opt_iocharset, "iocharset=%s"},
7ac9bcd5
MS		 485 {Opt_fmode, "mode=%o"},
486 {Opt_dmode, "dmode=%o"},
28de7948 487 {Opt_err, NULL}
1da177e4
LT		 488};
489
6da80894
MS		 490static int udf_parse_options(char *options, struct udf_options *uopt,
491 bool remount)
1da177e4
LT		 492{
493 char *p;
494 int option;
495
496 uopt->novrs = 0;
1da177e4
LT		 497 uopt->partition = 0xFFFF;
498 uopt->session = 0xFFFFFFFF;
499 uopt->lastblock = 0;
500 uopt->anchor = 0;
501 uopt->volume = 0xFFFFFFFF;
502 uopt->rootdir = 0xFFFFFFFF;
503 uopt->fileset = 0xFFFFFFFF;
504 uopt->nls_map = NULL;
505
506 if (!options)
507 return 1;
508
cb00ea35 509 while ((p = strsep(&options, ",")) != NULL) {
1da177e4
LT		 510 substring_t args[MAX_OPT_ARGS];
511 int token;
8c6915ae 512 unsigned n;
1da177e4
LT		 513 if (!*p)
514 continue;
515
516 token = match_token(p, tokens, args);
cb00ea35
CG		 517 switch (token) {
518 case Opt_novrs:
519 uopt->novrs = 1;
4136801a 520 break;
cb00ea35
CG		 521 case Opt_bs:
522 if (match_int(&args[0], &option))
523 return 0;
8c6915ae
FF		 524 n = option;
525 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
526 return 0;
527 uopt->blocksize = n;
1197e4df 528 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
cb00ea35
CG		 529 break;
530 case Opt_unhide:
531 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
532 break;
533 case Opt_undelete:
534 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
535 break;
536 case Opt_noadinicb:
537 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
538 break;
539 case Opt_adinicb:
540 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
541 break;
542 case Opt_shortad:
543 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
544 break;
545 case Opt_longad:
546 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
547 break;
548 case Opt_gid:
549 if (match_int(args, &option))
550 return 0;
c2ba138a
EB		 551 uopt->gid = make_kgid(current_user_ns(), option);
552 if (!gid_valid(uopt->gid))
553 return 0;
ca76d2d8 554 uopt->flags |= (1 << UDF_FLAG_GID_SET);
cb00ea35
CG		 555 break;
556 case Opt_uid:
557 if (match_int(args, &option))
558 return 0;
c2ba138a
EB		 559 uopt->uid = make_kuid(current_user_ns(), option);
560 if (!uid_valid(uopt->uid))
561 return 0;
ca76d2d8 562 uopt->flags |= (1 << UDF_FLAG_UID_SET);
cb00ea35
CG		 563 break;
564 case Opt_umask:
565 if (match_octal(args, &option))
566 return 0;
567 uopt->umask = option;
568 break;
569 case Opt_nostrict:
570 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
571 break;
572 case Opt_session:
573 if (match_int(args, &option))
574 return 0;
575 uopt->session = option;
6da80894
MS		 576 if (!remount)
577 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
cb00ea35
CG		 578 break;
579 case Opt_lastblock:
580 if (match_int(args, &option))
581 return 0;
582 uopt->lastblock = option;
6da80894
MS		 583 if (!remount)
584 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
cb00ea35
CG		 585 break;
586 case Opt_anchor:
587 if (match_int(args, &option))
588 return 0;
589 uopt->anchor = option;
590 break;
591 case Opt_volume:
592 if (match_int(args, &option))
593 return 0;
594 uopt->volume = option;
595 break;
596 case Opt_partition:
597 if (match_int(args, &option))
598 return 0;
599 uopt->partition = option;
600 break;
601 case Opt_fileset:
602 if (match_int(args, &option))
603 return 0;
604 uopt->fileset = option;
605 break;
606 case Opt_rootdir:
607 if (match_int(args, &option))
608 return 0;
609 uopt->rootdir = option;
610 break;
611 case Opt_utf8:
612 uopt->flags |= (1 << UDF_FLAG_UTF8);
613 break;
1da177e4 614#ifdef CONFIG_UDF_NLS
cb00ea35
CG		 615 case Opt_iocharset:
616 uopt->nls_map = load_nls(args[0].from);
617 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
618 break;
1da177e4 619#endif
cb00ea35
CG		 620 case Opt_uignore:
621 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
622 break;
623 case Opt_uforget:
624 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
625 break;
626 case Opt_gignore:
627 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
628 break;
629 case Opt_gforget:
630 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
631 break;
7ac9bcd5
MS		 632 case Opt_fmode:
633 if (match_octal(args, &option))
634 return 0;
635 uopt->fmode = option & 0777;
636 break;
637 case Opt_dmode:
638 if (match_octal(args, &option))
639 return 0;
640 uopt->dmode = option & 0777;
641 break;
cb00ea35 642 default:
78ace70c 643 pr_err("bad mount option \"%s\" or missing value\n", p);
1da177e4
LT		 644 return 0;
645 }
646 }
647 return 1;
648}
649
cb00ea35 650static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
1da177e4
LT		 651{
652 struct udf_options uopt;
6c79e987 653 struct udf_sb_info *sbi = UDF_SB(sb);
c79d967d 654 int error = 0;
69d75671 655 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
1da177e4 656
02b9984d 657 sync_filesystem(sb);
69d75671
JK		 658 if (lvidiu) {
659 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
e729eac6
JK		 660 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
661 return -EACCES;
662 }
663
6c79e987
MS		 664 uopt.flags = sbi->s_flags;
665 uopt.uid = sbi->s_uid;
666 uopt.gid = sbi->s_gid;
667 uopt.umask = sbi->s_umask;
7ac9bcd5
MS		 668 uopt.fmode = sbi->s_fmode;
669 uopt.dmode = sbi->s_dmode;
1da177e4 670
6da80894 671 if (!udf_parse_options(options, &uopt, true))
1da177e4
LT		 672 return -EINVAL;
673
c03cad24 674 write_lock(&sbi->s_cred_lock);
6c79e987
MS		 675 sbi->s_flags = uopt.flags;
676 sbi->s_uid = uopt.uid;
677 sbi->s_gid = uopt.gid;
678 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 679 sbi->s_fmode = uopt.fmode;
680 sbi->s_dmode = uopt.dmode;
c03cad24 681 write_unlock(&sbi->s_cred_lock);
1da177e4 682
c79d967d
CH		 683 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
684 goto out_unlock;
685
36350462 686 if (*flags & MS_RDONLY)
1da177e4 687 udf_close_lvid(sb);
36350462 688 else
1da177e4
LT		 689 udf_open_lvid(sb);
690
c79d967d 691out_unlock:
c79d967d 692 return error;
1da177e4
LT		 693}
694
40346005
JK		 695/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
696/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
697static loff_t udf_check_vsd(struct super_block *sb)
1da177e4
LT		 698{
699 struct volStructDesc *vsd = NULL;
44499602 700 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
1da177e4
LT		 701 int sectorsize;
702 struct buffer_head *bh = NULL;
cb00ea35
CG		 703 int nsr02 = 0;
704 int nsr03 = 0;
6c79e987 705 struct udf_sb_info *sbi;
1da177e4 706
6c79e987 707 sbi = UDF_SB(sb);
1da177e4
LT		 708 if (sb->s_blocksize < sizeof(struct volStructDesc))
709 sectorsize = sizeof(struct volStructDesc);
710 else
711 sectorsize = sb->s_blocksize;
712
6c79e987 713 sector += (sbi->s_session << sb->s_blocksize_bits);
1da177e4
LT		 714
715 udf_debug("Starting at sector %u (%ld byte sectors)\n",
706047a7
SM		 716 (unsigned int)(sector >> sb->s_blocksize_bits),
717 sb->s_blocksize);
44499602
PF		 718 /* Process the sequence (if applicable). The hard limit on the sector
719 * offset is arbitrary, hopefully large enough so that all valid UDF
720 * filesystems will be recognised. There is no mention of an upper
721 * bound to the size of the volume recognition area in the standard.
722 * The limit will prevent the code to read all the sectors of a
723 * specially crafted image (like a bluray disc full of CD001 sectors),
724 * potentially causing minutes or even hours of uninterruptible I/O
725 * activity. This actually happened with uninitialised SSD partitions
726 * (all 0xFF) before the check for the limit and all valid IDs were
727 * added */
728 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
729 sector += sectorsize) {
1da177e4
LT		 730 /* Read a block */
731 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
732 if (!bh)
733 break;
734
735 /* Look for ISO descriptors */
736 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 737 (sector & (sb->s_blocksize - 1)));
1da177e4 738
44499602 739 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
3a71fc5d 740 VSD_STD_ID_LEN)) {
cb00ea35
CG		 741 switch (vsd->structType) {
742 case 0:
743 udf_debug("ISO9660 Boot Record found\n");
744 break;
745 case 1:
a983f368 746 udf_debug("ISO9660 Primary Volume Descriptor found\n");
cb00ea35
CG		 747 break;
748 case 2:
a983f368 749 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
cb00ea35
CG		 750 break;
751 case 3:
a983f368 752 udf_debug("ISO9660 Volume Partition Descriptor found\n");
cb00ea35
CG		 753 break;
754 case 255:
a983f368 755 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
cb00ea35
CG		 756 break;
757 default:
758 udf_debug("ISO9660 VRS (%u) found\n",
759 vsd->structType);
760 break;
1da177e4 761 }
3a71fc5d
MS		 762 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
763 VSD_STD_ID_LEN))
764 ; /* nothing */
765 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
766 VSD_STD_ID_LEN)) {
3bf25cb4 767 brelse(bh);
1da177e4 768 break;
3a71fc5d
MS		 769 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
770 VSD_STD_ID_LEN))
1da177e4 771 nsr02 = sector;
3a71fc5d
MS		 772 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
773 VSD_STD_ID_LEN))
1da177e4 774 nsr03 = sector;
44499602
PF		 775 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
776 VSD_STD_ID_LEN))
777 ; /* nothing */
778 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
779 VSD_STD_ID_LEN))
780 ; /* nothing */
781 else {
782 /* invalid id : end of volume recognition area */
783 brelse(bh);
784 break;
785 }
3bf25cb4 786 brelse(bh);
1da177e4
LT		 787 }
788
789 if (nsr03)
790 return nsr03;
791 else if (nsr02)
792 return nsr02;
44499602
PF		 793 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
794 VSD_FIRST_SECTOR_OFFSET)
1da177e4
LT		 795 return -1;
796 else
797 return 0;
798}
799
3a71fc5d 800static int udf_find_fileset(struct super_block *sb,
5ca4e4be
PE		 801 struct kernel_lb_addr *fileset,
802 struct kernel_lb_addr *root)
1da177e4
LT		 803{
804 struct buffer_head *bh = NULL;
805 long lastblock;
806 uint16_t ident;
6c79e987 807 struct udf_sb_info *sbi;
1da177e4
LT		 808
809 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 810 fileset->partitionReferenceNum != 0xFFFF) {
97e961fd 811 bh = udf_read_ptagged(sb, fileset, 0, &ident);
1da177e4 812
28de7948 813 if (!bh) {
1da177e4 814 return 1;
28de7948 815 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 816 brelse(bh);
1da177e4
LT		 817 return 1;
818 }
cb00ea35 819
1da177e4
LT		 820 }
821
6c79e987 822 sbi = UDF_SB(sb);
3a71fc5d
MS		 823 if (!bh) {
824 /* Search backwards through the partitions */
5ca4e4be 825 struct kernel_lb_addr newfileset;
1da177e4 826
28de7948 827/* --> cvg: FIXME - is it reasonable? */
1da177e4 828 return 1;
cb00ea35 829
6c79e987 830 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 831 (newfileset.partitionReferenceNum != 0xFFFF &&
832 fileset->logicalBlockNum == 0xFFFFFFFF &&
833 fileset->partitionReferenceNum == 0xFFFF);
834 newfileset.partitionReferenceNum--) {
6c79e987
MS		 835 lastblock = sbi->s_partmaps
836 [newfileset.partitionReferenceNum]
837 .s_partition_len;
1da177e4
LT		 838 newfileset.logicalBlockNum = 0;
839
cb00ea35 840 do {
97e961fd 841 bh = udf_read_ptagged(sb, &newfileset, 0,
3a71fc5d 842 &ident);
cb00ea35
CG		 843 if (!bh) {
844 newfileset.logicalBlockNum++;
1da177e4
LT		 845 continue;
846 }
847
cb00ea35
CG		 848 switch (ident) {
849 case TAG_IDENT_SBD:
28de7948
CG		 850 {
851 struct spaceBitmapDesc *sp;
4b11111a
MS		 852 sp = (struct spaceBitmapDesc *)
853 bh->b_data;
28de7948
CG		 854 newfileset.logicalBlockNum += 1 +
855 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 856 sizeof(struct spaceBitmapDesc)
857 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 858 brelse(bh);
859 break;
860 }
cb00ea35 861 case TAG_IDENT_FSD:
28de7948
CG		 862 *fileset = newfileset;
863 break;
cb00ea35 864 default:
28de7948
CG		 865 newfileset.logicalBlockNum++;
866 brelse(bh);
867 bh = NULL;
868 break;
1da177e4 869 }
28de7948
CG		 870 } while (newfileset.logicalBlockNum < lastblock &&
871 fileset->logicalBlockNum == 0xFFFFFFFF &&
872 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 873 }
874 }
875
876 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 877 fileset->partitionReferenceNum != 0xFFFF) && bh) {
1da177e4 878 udf_debug("Fileset at block=%d, partition=%d\n",
cb00ea35
CG		 879 fileset->logicalBlockNum,
880 fileset->partitionReferenceNum);
1da177e4 881
6c79e987 882 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 883 udf_load_fileset(sb, bh, root);
3bf25cb4 884 brelse(bh);
1da177e4
LT		 885 return 0;
886 }
887 return 1;
888}
889
d759bfa4
JK		 890/*
891 * Load primary Volume Descriptor Sequence
892 *
893 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
894 * should be tried.
895 */
c0eb31ed 896static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 897{
898 struct primaryVolDesc *pvoldesc;
9293fcfb 899 uint8_t *outstr;
c0eb31ed
JK		 900 struct buffer_head *bh;
901 uint16_t ident;
d759bfa4 902 int ret = -ENOMEM;
ba9aadd8 903
9293fcfb 904 outstr = kmalloc(128, GFP_NOFS);
ba9aadd8 905 if (!outstr)
9293fcfb 906 return -ENOMEM;
c0eb31ed
JK		 907
908 bh = udf_read_tagged(sb, block, block, &ident);
d759bfa4
JK		 909 if (!bh) {
910 ret = -EAGAIN;
ba9aadd8 911 goto out2;
d759bfa4 912 }
ba9aadd8 913
d759bfa4
JK		 914 if (ident != TAG_IDENT_PVD) {
915 ret = -EIO;
916 goto out_bh;
917 }
1da177e4
LT		 918
919 pvoldesc = (struct primaryVolDesc *)bh->b_data;
920
56774805
MS		 921 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
922 pvoldesc->recordingDateAndTime)) {
af15a298 923#ifdef UDFFS_DEBUG
5ca4e4be 924 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
a983f368 925 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
af15a298
MS		 926 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
927 ts->minute, le16_to_cpu(ts->typeAndTimezone));
928#endif
1da177e4
LT		 929 }
930
c26f6c61 931 ret = udf_dstrCS0toUTF8(outstr, 31, pvoldesc->volIdent, 32);
9293fcfb
AG		 932 if (ret < 0)
933 goto out_bh;
e9d4cf41 934
9293fcfb
AG		 935 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
936 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
1da177e4 937
c26f6c61 938 ret = udf_dstrCS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128);
9293fcfb
AG		 939 if (ret < 0)
940 goto out_bh;
e9d4cf41 941
9293fcfb
AG		 942 outstr[ret] = 0;
943 udf_debug("volSetIdent[] = '%s'\n", outstr);
c0eb31ed 944
ba9aadd8 945 ret = 0;
d759bfa4
JK		 946out_bh:
947 brelse(bh);
ba9aadd8
MS		 948out2:
949 kfree(outstr);
ba9aadd8 950 return ret;
1da177e4
LT		 951}
952
3080a74e
NJ		 953struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
954 u32 meta_file_loc, u32 partition_num)
955{
956 struct kernel_lb_addr addr;
957 struct inode *metadata_fe;
958
959 addr.logicalBlockNum = meta_file_loc;
960 addr.partitionReferenceNum = partition_num;
961
6174c2eb 962 metadata_fe = udf_iget_special(sb, &addr);
3080a74e 963
6d3d5e86 964 if (IS_ERR(metadata_fe)) {
3080a74e 965 udf_warn(sb, "metadata inode efe not found\n");
6d3d5e86
JK		 966 return metadata_fe;
967 }
968 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
3080a74e
NJ		 969 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
970 iput(metadata_fe);
6d3d5e86 971 return ERR_PTR(-EIO);
3080a74e
NJ		 972 }
973
974 return metadata_fe;
975}
976
bfb257a5
JK		 977static int udf_load_metadata_files(struct super_block *sb, int partition)
978{
979 struct udf_sb_info *sbi = UDF_SB(sb);
980 struct udf_part_map *map;
981 struct udf_meta_data *mdata;
5ca4e4be 982 struct kernel_lb_addr addr;
6d3d5e86 983 struct inode *fe;
bfb257a5
JK		 984
985 map = &sbi->s_partmaps[partition];
986 mdata = &map->s_type_specific.s_metadata;
987
988 /* metadata address */
bfb257a5 989 udf_debug("Metadata file location: block = %d part = %d\n",
3080a74e 990 mdata->s_meta_file_loc, map->s_partition_num);
bfb257a5 991
6d3d5e86
JK		 992 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
993 map->s_partition_num);
994 if (IS_ERR(fe)) {
3080a74e
NJ		 995 /* mirror file entry */
996 udf_debug("Mirror metadata file location: block = %d part = %d\n",
997 mdata->s_mirror_file_loc, map->s_partition_num);
bfb257a5 998
6d3d5e86
JK		 999 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
1000 map->s_partition_num);
bfb257a5 1001
6d3d5e86 1002 if (IS_ERR(fe)) {
3080a74e 1003 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
6d3d5e86 1004 return PTR_ERR(fe);
3080a74e 1005 }
6d3d5e86
JK		 1006 mdata->s_mirror_fe = fe;
1007 } else
1008 mdata->s_metadata_fe = fe;
1009
bfb257a5
JK		 1010
1011 /*
1012 * bitmap file entry
1013 * Note:
1014 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1015 */
1016 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1017 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1018 addr.partitionReferenceNum = map->s_partition_num;
1019
1020 udf_debug("Bitmap file location: block = %d part = %d\n",
a983f368 1021 addr.logicalBlockNum, addr.partitionReferenceNum);
bfb257a5 1022
6174c2eb 1023 fe = udf_iget_special(sb, &addr);
6d3d5e86 1024 if (IS_ERR(fe)) {
bfb257a5 1025 if (sb->s_flags & MS_RDONLY)
a40ecd7b 1026 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
bfb257a5 1027 else {
8076c363 1028 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
6d3d5e86 1029 return PTR_ERR(fe);
bfb257a5 1030 }
6d3d5e86
JK		 1031 } else
1032 mdata->s_bitmap_fe = fe;
bfb257a5
JK		 1033 }
1034
1035 udf_debug("udf_load_metadata_files Ok\n");
bfb257a5 1036 return 0;
bfb257a5
JK		 1037}
1038
28de7948 1039static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
5ca4e4be 1040 struct kernel_lb_addr *root)
1da177e4
LT		 1041{
1042 struct fileSetDesc *fset;
1043
1044 fset = (struct fileSetDesc *)bh->b_data;
1045
1046 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1047
6c79e987 1048 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 1049
cb00ea35
CG		 1050 udf_debug("Rootdir at block=%d, partition=%d\n",
1051 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 1052}
1053
883cb9d1
MS		 1054int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1055{
1056 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 1057 return DIV_ROUND_UP(map->s_partition_len +
1058 (sizeof(struct spaceBitmapDesc) << 3),
1059 sb->s_blocksize * 8);
883cb9d1
MS		 1060}
1061
66e1da3f
MS		 1062static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1063{
66e1da3f
MS		 1064 struct udf_bitmap *bitmap;
1065 int nr_groups;
1066 int size;
1067
883cb9d1 1068 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 1069 size = sizeof(struct udf_bitmap) +
1070 (sizeof(struct buffer_head *) * nr_groups);
1071
1072 if (size <= PAGE_SIZE)
ed2ae6f6 1073 bitmap = kzalloc(size, GFP_KERNEL);
66e1da3f 1074 else
ed2ae6f6 1075 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
66e1da3f 1076
75b09e02 1077 if (bitmap == NULL)
66e1da3f 1078 return NULL;
66e1da3f 1079
66e1da3f
MS		 1080 bitmap->s_nr_groups = nr_groups;
1081 return bitmap;
1082}
1083
3fb38dfa
JK		 1084static int udf_fill_partdesc_info(struct super_block *sb,
1085 struct partitionDesc *p, int p_index)
1da177e4 1086{
6c79e987 1087 struct udf_part_map *map;
165923fa 1088 struct udf_sb_info *sbi = UDF_SB(sb);
3fb38dfa 1089 struct partitionHeaderDesc *phd;
165923fa 1090
3fb38dfa 1091 map = &sbi->s_partmaps[p_index];
165923fa
MS		 1092
1093 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1094 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1095
1096 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1097 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1098 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1099 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1100 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1101 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1102 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1103 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1104
a983f368
JP		 1105 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1106 p_index, map->s_partition_type,
1107 map->s_partition_root, map->s_partition_len);
165923fa
MS		 1108
1109 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1110 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
3fb38dfa 1111 return 0;
165923fa
MS		 1112
1113 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1114 if (phd->unallocSpaceTable.extLength) {
5ca4e4be 1115 struct kernel_lb_addr loc = {
165923fa
MS		 1116 .logicalBlockNum = le32_to_cpu(
1117 phd->unallocSpaceTable.extPosition),
3fb38dfa 1118 .partitionReferenceNum = p_index,
165923fa 1119 };
6d3d5e86 1120 struct inode *inode;
165923fa 1121
6174c2eb 1122 inode = udf_iget_special(sb, &loc);
6d3d5e86 1123 if (IS_ERR(inode)) {
165923fa 1124 udf_debug("cannot load unallocSpaceTable (part %d)\n",
a983f368 1125 p_index);
6d3d5e86 1126 return PTR_ERR(inode);
165923fa 1127 }
6d3d5e86 1128 map->s_uspace.s_table = inode;
165923fa
MS		 1129 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1130 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
a983f368 1131 p_index, map->s_uspace.s_table->i_ino);
165923fa
MS		 1132 }
1133
1134 if (phd->unallocSpaceBitmap.extLength) {
3fb38dfa
JK		 1135 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1136 if (!bitmap)
d759bfa4 1137 return -ENOMEM;
165923fa 1138 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1139 bitmap->s_extPosition = le32_to_cpu(
165923fa 1140 phd->unallocSpaceBitmap.extPosition);
2e0838fd 1141 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
a983f368
JP		 1142 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1143 p_index, bitmap->s_extPosition);
165923fa
MS		 1144 }
1145
1146 if (phd->partitionIntegrityTable.extLength)
3fb38dfa 1147 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
165923fa
MS		 1148
1149 if (phd->freedSpaceTable.extLength) {
5ca4e4be 1150 struct kernel_lb_addr loc = {
165923fa
MS		 1151 .logicalBlockNum = le32_to_cpu(
1152 phd->freedSpaceTable.extPosition),
3fb38dfa 1153 .partitionReferenceNum = p_index,
165923fa 1154 };
6d3d5e86 1155 struct inode *inode;
165923fa 1156
6174c2eb 1157 inode = udf_iget_special(sb, &loc);
6d3d5e86 1158 if (IS_ERR(inode)) {
3fb38dfa 1159 udf_debug("cannot load freedSpaceTable (part %d)\n",
a983f368 1160 p_index);
6d3d5e86 1161 return PTR_ERR(inode);
165923fa 1162 }
6d3d5e86 1163 map->s_fspace.s_table = inode;
165923fa
MS		 1164 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1165 udf_debug("freedSpaceTable (part %d) @ %ld\n",
a983f368 1166 p_index, map->s_fspace.s_table->i_ino);
165923fa
MS		 1167 }
1168
1169 if (phd->freedSpaceBitmap.extLength) {
3fb38dfa
JK		 1170 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1171 if (!bitmap)
d759bfa4 1172 return -ENOMEM;
165923fa 1173 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1174 bitmap->s_extPosition = le32_to_cpu(
165923fa 1175 phd->freedSpaceBitmap.extPosition);
2e0838fd 1176 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
a983f368
JP		 1177 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1178 p_index, bitmap->s_extPosition);
165923fa 1179 }
3fb38dfa
JK		 1180 return 0;
1181}
1182
e971b0b9
JK		 1183static void udf_find_vat_block(struct super_block *sb, int p_index,
1184 int type1_index, sector_t start_block)
38b74a53
JK		 1185{
1186 struct udf_sb_info *sbi = UDF_SB(sb);
1187 struct udf_part_map *map = &sbi->s_partmaps[p_index];
e971b0b9 1188 sector_t vat_block;
5ca4e4be 1189 struct kernel_lb_addr ino;
6d3d5e86 1190 struct inode *inode;
e971b0b9
JK		 1191
1192 /*
1193 * VAT file entry is in the last recorded block. Some broken disks have
1194 * it a few blocks before so try a bit harder...
1195 */
1196 ino.partitionReferenceNum = type1_index;
1197 for (vat_block = start_block;
1198 vat_block >= map->s_partition_root &&
6d3d5e86 1199 vat_block >= start_block - 3; vat_block--) {
e971b0b9 1200 ino.logicalBlockNum = vat_block - map->s_partition_root;
6174c2eb 1201 inode = udf_iget_special(sb, &ino);
6d3d5e86
JK		 1202 if (!IS_ERR(inode)) {
1203 sbi->s_vat_inode = inode;
1204 break;
1205 }
e971b0b9
JK		 1206 }
1207}
1208
1209static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1210{
1211 struct udf_sb_info *sbi = UDF_SB(sb);
1212 struct udf_part_map *map = &sbi->s_partmaps[p_index];
fa5e0815
JK		 1213 struct buffer_head *bh = NULL;
1214 struct udf_inode_info *vati;
1215 uint32_t pos;
1216 struct virtualAllocationTable20 *vat20;
4bf17af0 1217 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
38b74a53 1218
e971b0b9 1219 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
4bf17af0
JK		 1220 if (!sbi->s_vat_inode &&
1221 sbi->s_last_block != blocks - 1) {
78ace70c
JP		 1222 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1223 (unsigned long)sbi->s_last_block,
1224 (unsigned long)blocks - 1);
e971b0b9 1225 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
4bf17af0 1226 }
38b74a53 1227 if (!sbi->s_vat_inode)
d759bfa4 1228 return -EIO;
38b74a53
JK		 1229
1230 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1231 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1232 map->s_type_specific.s_virtual.s_num_entries =
1233 (sbi->s_vat_inode->i_size - 36) >> 2;
1234 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1235 vati = UDF_I(sbi->s_vat_inode);
1236 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1237 pos = udf_block_map(sbi->s_vat_inode, 0);
1238 bh = sb_bread(sb, pos);
1239 if (!bh)
d759bfa4 1240 return -EIO;
fa5e0815
JK		 1241 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1242 } else {
1243 vat20 = (struct virtualAllocationTable20 *)
1244 vati->i_ext.i_data;
1245 }
38b74a53 1246
38b74a53 1247 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1248 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1249 map->s_type_specific.s_virtual.s_num_entries =
1250 (sbi->s_vat_inode->i_size -
1251 map->s_type_specific.s_virtual.
1252 s_start_offset) >> 2;
1253 brelse(bh);
1254 }
1255 return 0;
1256}
1257
d759bfa4
JK		 1258/*
1259 * Load partition descriptor block
1260 *
1261 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1262 * sequence.
1263 */
3fb38dfa
JK		 1264static int udf_load_partdesc(struct super_block *sb, sector_t block)
1265{
1266 struct buffer_head *bh;
1267 struct partitionDesc *p;
1268 struct udf_part_map *map;
1269 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1270 int i, type1_idx;
3fb38dfa
JK		 1271 uint16_t partitionNumber;
1272 uint16_t ident;
d759bfa4 1273 int ret;
3fb38dfa
JK		 1274
1275 bh = udf_read_tagged(sb, block, block, &ident);
1276 if (!bh)
d759bfa4
JK		 1277 return -EAGAIN;
1278 if (ident != TAG_IDENT_PD) {
1279 ret = 0;
3fb38dfa 1280 goto out_bh;
d759bfa4 1281 }
3fb38dfa
JK		 1282
1283 p = (struct partitionDesc *)bh->b_data;
1284 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1285
bfb257a5 1286 /* First scan for TYPE1, SPARABLE and METADATA partitions */
3fb38dfa
JK		 1287 for (i = 0; i < sbi->s_partitions; i++) {
1288 map = &sbi->s_partmaps[i];
1289 udf_debug("Searching map: (%d == %d)\n",
1290 map->s_partition_num, partitionNumber);
38b74a53
JK		 1291 if (map->s_partition_num == partitionNumber &&
1292 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1293 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1294 break;
1295 }
1296
38b74a53 1297 if (i >= sbi->s_partitions) {
3fb38dfa
JK		 1298 udf_debug("Partition (%d) not found in partition map\n",
1299 partitionNumber);
d759bfa4 1300 ret = 0;
3fb38dfa
JK		 1301 goto out_bh;
1302 }
165923fa 1303
3fb38dfa 1304 ret = udf_fill_partdesc_info(sb, p, i);
d759bfa4
JK		 1305 if (ret < 0)
1306 goto out_bh;
38b74a53
JK		 1307
1308 /*
bfb257a5
JK		 1309 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1310 * PHYSICAL partitions are already set up
38b74a53
JK		 1311 */
1312 type1_idx = i;
44499602
PF		 1313#ifdef UDFFS_DEBUG
1314 map = NULL; /* supress 'maybe used uninitialized' warning */
1315#endif
38b74a53
JK		 1316 for (i = 0; i < sbi->s_partitions; i++) {
1317 map = &sbi->s_partmaps[i];
1318
1319 if (map->s_partition_num == partitionNumber &&
1320 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1321 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1322 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1323 break;
1324 }
1325
d759bfa4
JK		 1326 if (i >= sbi->s_partitions) {
1327 ret = 0;
38b74a53 1328 goto out_bh;
d759bfa4 1329 }
38b74a53
JK		 1330
1331 ret = udf_fill_partdesc_info(sb, p, i);
d759bfa4 1332 if (ret < 0)
38b74a53
JK		 1333 goto out_bh;
1334
bfb257a5
JK		 1335 if (map->s_partition_type == UDF_METADATA_MAP25) {
1336 ret = udf_load_metadata_files(sb, i);
d759bfa4 1337 if (ret < 0) {
78ace70c
JP		 1338 udf_err(sb, "error loading MetaData partition map %d\n",
1339 i);
bfb257a5
JK		 1340 goto out_bh;
1341 }
1342 } else {
e729eac6
JK		 1343 /*
1344 * If we have a partition with virtual map, we don't handle
1345 * writing to it (we overwrite blocks instead of relocating
1346 * them).
1347 */
1348 if (!(sb->s_flags & MS_RDONLY)) {
1349 ret = -EACCES;
1350 goto out_bh;
1351 }
bfb257a5 1352 ret = udf_load_vat(sb, i, type1_idx);
d759bfa4 1353 if (ret < 0)
bfb257a5 1354 goto out_bh;
bfb257a5 1355 }
d759bfa4 1356 ret = 0;
c0eb31ed 1357out_bh:
2e0838fd 1358 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1359 brelse(bh);
1360 return ret;
1da177e4
LT		 1361}
1362
1df2ae31
JK		 1363static int udf_load_sparable_map(struct super_block *sb,
1364 struct udf_part_map *map,
1365 struct sparablePartitionMap *spm)
1366{
1367 uint32_t loc;
1368 uint16_t ident;
1369 struct sparingTable *st;
1370 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1371 int i;
1372 struct buffer_head *bh;
1373
1374 map->s_partition_type = UDF_SPARABLE_MAP15;
1375 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1376 if (!is_power_of_2(sdata->s_packet_len)) {
1377 udf_err(sb, "error loading logical volume descriptor: "
1378 "Invalid packet length %u\n",
1379 (unsigned)sdata->s_packet_len);
1380 return -EIO;
1381 }
1382 if (spm->numSparingTables > 4) {
1383 udf_err(sb, "error loading logical volume descriptor: "
1384 "Too many sparing tables (%d)\n",
1385 (int)spm->numSparingTables);
1386 return -EIO;
1387 }
1388
1389 for (i = 0; i < spm->numSparingTables; i++) {
1390 loc = le32_to_cpu(spm->locSparingTable[i]);
1391 bh = udf_read_tagged(sb, loc, loc, &ident);
1392 if (!bh)
1393 continue;
1394
1395 st = (struct sparingTable *)bh->b_data;
1396 if (ident != 0 ||
1397 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1398 strlen(UDF_ID_SPARING)) ||
1399 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1400 sb->s_blocksize) {
1401 brelse(bh);
1402 continue;
1403 }
1404
1405 sdata->s_spar_map[i] = bh;
1406 }
1407 map->s_partition_func = udf_get_pblock_spar15;
1408 return 0;
1409}
1410
c0eb31ed 1411static int udf_load_logicalvol(struct super_block *sb, sector_t block,
5ca4e4be 1412 struct kernel_lb_addr *fileset)
1da177e4
LT		 1413{
1414 struct logicalVolDesc *lvd;
1df2ae31 1415 int i, offset;
1da177e4 1416 uint8_t type;
6c79e987 1417 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1418 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1419 uint16_t ident;
1420 struct buffer_head *bh;
adee11b2 1421 unsigned int table_len;
d759bfa4 1422 int ret;
1da177e4 1423
c0eb31ed
JK		 1424 bh = udf_read_tagged(sb, block, block, &ident);
1425 if (!bh)
d759bfa4 1426 return -EAGAIN;
c0eb31ed 1427 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4 1428 lvd = (struct logicalVolDesc *)bh->b_data;
adee11b2 1429 table_len = le32_to_cpu(lvd->mapTableLength);
57b9655d 1430 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
adee11b2
JK		 1431 udf_err(sb, "error loading logical volume descriptor: "
1432 "Partition table too long (%u > %lu)\n", table_len,
1433 sb->s_blocksize - sizeof(*lvd));
d759bfa4 1434 ret = -EIO;
adee11b2
JK		 1435 goto out_bh;
1436 }
1da177e4 1437
cb14d340
JK		 1438 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1439 if (ret)
c0eb31ed 1440 goto out_bh;
1da177e4 1441
cb00ea35 1442 for (i = 0, offset = 0;
adee11b2 1443 i < sbi->s_partitions && offset < table_len;
4b11111a
MS		 1444 i++, offset += gpm->partitionMapLength) {
1445 struct udf_part_map *map = &sbi->s_partmaps[i];
1446 gpm = (struct genericPartitionMap *)
1447 &(lvd->partitionMaps[offset]);
1448 type = gpm->partitionMapType;
cb00ea35 1449 if (type == 1) {
4b11111a
MS		 1450 struct genericPartitionMap1 *gpm1 =
1451 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1452 map->s_partition_type = UDF_TYPE1_MAP15;
1453 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1454 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1455 map->s_partition_func = NULL;
cb00ea35 1456 } else if (type == 2) {
4b11111a
MS		 1457 struct udfPartitionMap2 *upm2 =
1458 (struct udfPartitionMap2 *)gpm;
1459 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1460 strlen(UDF_ID_VIRTUAL))) {
1461 u16 suf =
1462 le16_to_cpu(((__le16 *)upm2->partIdent.
1463 identSuffix)[0]);
c82a1275 1464 if (suf < 0x0200) {
4b11111a
MS		 1465 map->s_partition_type =
1466 UDF_VIRTUAL_MAP15;
1467 map->s_partition_func =
1468 udf_get_pblock_virt15;
c82a1275 1469 } else {
4b11111a
MS		 1470 map->s_partition_type =
1471 UDF_VIRTUAL_MAP20;
1472 map->s_partition_func =
1473 udf_get_pblock_virt20;
1da177e4 1474 }
4b11111a
MS		 1475 } else if (!strncmp(upm2->partIdent.ident,
1476 UDF_ID_SPARABLE,
1477 strlen(UDF_ID_SPARABLE))) {
d759bfa4
JK		 1478 ret = udf_load_sparable_map(sb, map,
1479 (struct sparablePartitionMap *)gpm);
1480 if (ret < 0)
1df2ae31 1481 goto out_bh;
bfb257a5
JK		 1482 } else if (!strncmp(upm2->partIdent.ident,
1483 UDF_ID_METADATA,
1484 strlen(UDF_ID_METADATA))) {
1485 struct udf_meta_data *mdata =
1486 &map->s_type_specific.s_metadata;
1487 struct metadataPartitionMap *mdm =
1488 (struct metadataPartitionMap *)
1489 &(lvd->partitionMaps[offset]);
a983f368
JP		 1490 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1491 i, type, UDF_ID_METADATA);
bfb257a5
JK		 1492
1493 map->s_partition_type = UDF_METADATA_MAP25;
1494 map->s_partition_func = udf_get_pblock_meta25;
1495
1496 mdata->s_meta_file_loc =
1497 le32_to_cpu(mdm->metadataFileLoc);
1498 mdata->s_mirror_file_loc =
1499 le32_to_cpu(mdm->metadataMirrorFileLoc);
1500 mdata->s_bitmap_file_loc =
1501 le32_to_cpu(mdm->metadataBitmapFileLoc);
1502 mdata->s_alloc_unit_size =
1503 le32_to_cpu(mdm->allocUnitSize);
1504 mdata->s_align_unit_size =
1505 le16_to_cpu(mdm->alignUnitSize);
ed47a7d0
JK		 1506 if (mdm->flags & 0x01)
1507 mdata->s_flags |= MF_DUPLICATE_MD;
bfb257a5
JK		 1508
1509 udf_debug("Metadata Ident suffix=0x%x\n",
a983f368
JP		 1510 le16_to_cpu(*(__le16 *)
1511 mdm->partIdent.identSuffix));
bfb257a5 1512 udf_debug("Metadata part num=%d\n",
a983f368 1513 le16_to_cpu(mdm->partitionNum));
bfb257a5 1514 udf_debug("Metadata part alloc unit size=%d\n",
a983f368 1515 le32_to_cpu(mdm->allocUnitSize));
bfb257a5 1516 udf_debug("Metadata file loc=%d\n",
a983f368 1517 le32_to_cpu(mdm->metadataFileLoc));
bfb257a5 1518 udf_debug("Mirror file loc=%d\n",
a983f368 1519 le32_to_cpu(mdm->metadataMirrorFileLoc));
bfb257a5 1520 udf_debug("Bitmap file loc=%d\n",
a983f368 1521 le32_to_cpu(mdm->metadataBitmapFileLoc));
ed47a7d0
JK		 1522 udf_debug("Flags: %d %d\n",
1523 mdata->s_flags, mdm->flags);
cb00ea35 1524 } else {
3a71fc5d
MS		 1525 udf_debug("Unknown ident: %s\n",
1526 upm2->partIdent.ident);
1da177e4
LT		 1527 continue;
1528 }
6c79e987
MS		 1529 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1530 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4
LT		 1531 }
1532 udf_debug("Partition (%d:%d) type %d on volume %d\n",
a983f368 1533 i, map->s_partition_num, type, map->s_volumeseqnum);
1da177e4
LT		 1534 }
1535
cb00ea35 1536 if (fileset) {
5ca4e4be 1537 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1538
1539 *fileset = lelb_to_cpu(la->extLocation);
a983f368
JP		 1540 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1541 fileset->logicalBlockNum,
28de7948 1542 fileset->partitionReferenceNum);
1da177e4
LT		 1543 }
1544 if (lvd->integritySeqExt.extLength)
1545 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
d759bfa4 1546 ret = 0;
c0eb31ed
JK		 1547out_bh:
1548 brelse(bh);
1549 return ret;
1da177e4
LT		 1550}
1551
1552/*
a47241cd 1553 * Find the prevailing Logical Volume Integrity Descriptor.
1da177e4 1554 */
5ca4e4be 1555static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1da177e4 1556{
a47241cd 1557 struct buffer_head *bh, *final_bh;
1da177e4 1558 uint16_t ident;
6c79e987
MS		 1559 struct udf_sb_info *sbi = UDF_SB(sb);
1560 struct logicalVolIntegrityDesc *lvid;
a47241cd
AT		 1561 int indirections = 0;
1562
1563 while (++indirections <= UDF_MAX_LVID_NESTING) {
1564 final_bh = NULL;
1565 while (loc.extLength > 0 &&
1566 (bh = udf_read_tagged(sb, loc.extLocation,
1567 loc.extLocation, &ident))) {
1568 if (ident != TAG_IDENT_LVID) {
1569 brelse(bh);
1570 break;
1571 }
1572
1573 brelse(final_bh);
1574 final_bh = bh;
1da177e4 1575
a47241cd
AT		 1576 loc.extLength -= sb->s_blocksize;
1577 loc.extLocation++;
1578 }
cb00ea35 1579
a47241cd
AT		 1580 if (!final_bh)
1581 return;
cb00ea35 1582
a47241cd
AT		 1583 brelse(sbi->s_lvid_bh);
1584 sbi->s_lvid_bh = final_bh;
1585
1586 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1587 if (lvid->nextIntegrityExt.extLength == 0)
1588 return;
1589
1590 loc = leea_to_cpu(lvid->nextIntegrityExt);
1da177e4 1591 }
a47241cd
AT		 1592
1593 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1594 UDF_MAX_LVID_NESTING);
1595 brelse(sbi->s_lvid_bh);
1596 sbi->s_lvid_bh = NULL;
1da177e4
LT		 1597}
1598
e7a4eb86 1599
1da177e4 1600/*
d759bfa4
JK		 1601 * Process a main/reserve volume descriptor sequence.
1602 * @block First block of first extent of the sequence.
1603 * @lastblock Lastblock of first extent of the sequence.
1604 * @fileset There we store extent containing root fileset
1da177e4 1605 *
d759bfa4
JK		 1606 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1607 * sequence
1da177e4 1608 */
d759bfa4
JK		 1609static noinline int udf_process_sequence(
1610 struct super_block *sb,
1611 sector_t block, sector_t lastblock,
1612 struct kernel_lb_addr *fileset)
1da177e4
LT		 1613{
1614 struct buffer_head *bh = NULL;
1615 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1616 struct udf_vds_record *curr;
1da177e4
LT		 1617 struct generic_desc *gd;
1618 struct volDescPtr *vdp;
2b8f9421 1619 bool done = false;
1da177e4
LT		 1620 uint32_t vdsn;
1621 uint16_t ident;
1622 long next_s = 0, next_e = 0;
d759bfa4 1623 int ret;
e7a4eb86 1624 unsigned int indirections = 0;
1da177e4
LT		 1625
1626 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1627
c0eb31ed
JK		 1628 /*
1629 * Read the main descriptor sequence and find which descriptors
1630 * are in it.
1631 */
cb00ea35 1632 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1633
1634 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed 1635 if (!bh) {
78ace70c
JP		 1636 udf_err(sb,
1637 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1638 (unsigned long long)block);
d759bfa4 1639 return -EAGAIN;
c0eb31ed 1640 }
1da177e4
LT		 1641
1642 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1643 gd = (struct generic_desc *)bh->b_data;
1644 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1645 switch (ident) {
28de7948 1646 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1647 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1648 if (vdsn >= curr->volDescSeqNum) {
1649 curr->volDescSeqNum = vdsn;
1650 curr->block = block;
cb00ea35
CG		 1651 }
1652 break;
28de7948 1653 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
4b11111a
MS		 1654 curr = &vds[VDS_POS_VOL_DESC_PTR];
1655 if (vdsn >= curr->volDescSeqNum) {
1656 curr->volDescSeqNum = vdsn;
1657 curr->block = block;
cb00ea35
CG		 1658
1659 vdp = (struct volDescPtr *)bh->b_data;
4b11111a
MS		 1660 next_s = le32_to_cpu(
1661 vdp->nextVolDescSeqExt.extLocation);
1662 next_e = le32_to_cpu(
1663 vdp->nextVolDescSeqExt.extLength);
cb00ea35
CG		 1664 next_e = next_e >> sb->s_blocksize_bits;
1665 next_e += next_s;
1666 }
1667 break;
28de7948 1668 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1669 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1670 if (vdsn >= curr->volDescSeqNum) {
1671 curr->volDescSeqNum = vdsn;
1672 curr->block = block;
cb00ea35
CG		 1673 }
1674 break;
28de7948 1675 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1676 curr = &vds[VDS_POS_PARTITION_DESC];
1677 if (!curr->block)
1678 curr->block = block;
cb00ea35 1679 break;
28de7948 1680 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1681 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1682 if (vdsn >= curr->volDescSeqNum) {
1683 curr->volDescSeqNum = vdsn;
1684 curr->block = block;
cb00ea35
CG		 1685 }
1686 break;
28de7948 1687 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1688 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1689 if (vdsn >= curr->volDescSeqNum) {
1690 curr->volDescSeqNum = vdsn;
1691 curr->block = block;
cb00ea35
CG		 1692 }
1693 break;
28de7948 1694 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
e7a4eb86
VN		 1695 if (++indirections > UDF_MAX_TD_NESTING) {
1696 udf_err(sb, "too many TDs (max %u supported)\n", UDF_MAX_TD_NESTING);
1697 brelse(bh);
1698 return -EIO;
1699 }
1700
cb00ea35
CG		 1701 vds[VDS_POS_TERMINATING_DESC].block = block;
1702 if (next_e) {
1703 block = next_s;
1704 lastblock = next_e;
1705 next_s = next_e = 0;
4b11111a 1706 } else
2b8f9421 1707 done = true;
cb00ea35 1708 break;
1da177e4 1709 }
3bf25cb4 1710 brelse(bh);
1da177e4 1711 }
c0eb31ed
JK		 1712 /*
1713 * Now read interesting descriptors again and process them
1714 * in a suitable order
1715 */
1716 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
78ace70c 1717 udf_err(sb, "Primary Volume Descriptor not found!\n");
d759bfa4
JK		 1718 return -EAGAIN;
1719 }
1720 ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1721 if (ret < 0)
1722 return ret;
1723
1724 if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1725 ret = udf_load_logicalvol(sb,
1726 vds[VDS_POS_LOGICAL_VOL_DESC].block,
1727 fileset);
1728 if (ret < 0)
1729 return ret;
c0eb31ed 1730 }
165923fa 1731
c0eb31ed
JK		 1732 if (vds[VDS_POS_PARTITION_DESC].block) {
1733 /*
1734 * We rescan the whole descriptor sequence to find
1735 * partition descriptor blocks and process them.
1736 */
1737 for (block = vds[VDS_POS_PARTITION_DESC].block;
1738 block < vds[VDS_POS_TERMINATING_DESC].block;
d759bfa4
JK		 1739 block++) {
1740 ret = udf_load_partdesc(sb, block);
1741 if (ret < 0)
1742 return ret;
1743 }
1da177e4
LT		 1744 }
1745
1746 return 0;
1747}
1748
d759bfa4
JK		 1749/*
1750 * Load Volume Descriptor Sequence described by anchor in bh
1751 *
1752 * Returns <0 on error, 0 on success
1753 */
40346005
JK		 1754static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1755 struct kernel_lb_addr *fileset)
1da177e4 1756{
40346005 1757 struct anchorVolDescPtr *anchor;
d759bfa4
JK		 1758 sector_t main_s, main_e, reserve_s, reserve_e;
1759 int ret;
1da177e4 1760
40346005
JK		 1761 anchor = (struct anchorVolDescPtr *)bh->b_data;
1762
1763 /* Locate the main sequence */
1764 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1765 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1766 main_e = main_e >> sb->s_blocksize_bits;
1767 main_e += main_s;
1768
1769 /* Locate the reserve sequence */
1770 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1771 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1772 reserve_e = reserve_e >> sb->s_blocksize_bits;
1773 reserve_e += reserve_s;
1774
1775 /* Process the main & reserve sequences */
1776 /* responsible for finding the PartitionDesc(s) */
d759bfa4
JK		 1777 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1778 if (ret != -EAGAIN)
1779 return ret;
bff943af 1780 udf_sb_free_partitions(sb);
d759bfa4
JK		 1781 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1782 if (ret < 0) {
1783 udf_sb_free_partitions(sb);
1784 /* No sequence was OK, return -EIO */
1785 if (ret == -EAGAIN)
1786 ret = -EIO;
1787 }
1788 return ret;
1da177e4
LT		 1789}
1790
40346005
JK		 1791/*
1792 * Check whether there is an anchor block in the given block and
1793 * load Volume Descriptor Sequence if so.
d759bfa4
JK		 1794 *
1795 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1796 * block
40346005
JK		 1797 */
1798static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1799 struct kernel_lb_addr *fileset)
1197e4df 1800{
40346005
JK		 1801 struct buffer_head *bh;
1802 uint16_t ident;
1803 int ret;
1197e4df 1804
40346005
JK		 1805 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1806 udf_fixed_to_variable(block) >=
1807 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
d759bfa4 1808 return -EAGAIN;
40346005
JK		 1809
1810 bh = udf_read_tagged(sb, block, block, &ident);
1811 if (!bh)
d759bfa4 1812 return -EAGAIN;
40346005
JK		 1813 if (ident != TAG_IDENT_AVDP) {
1814 brelse(bh);
d759bfa4 1815 return -EAGAIN;
1197e4df 1816 }
40346005
JK		 1817 ret = udf_load_sequence(sb, bh, fileset);
1818 brelse(bh);
1819 return ret;
1197e4df
CL		 1820}
1821
d759bfa4
JK		 1822/*
1823 * Search for an anchor volume descriptor pointer.
1824 *
1825 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1826 * of anchors.
1827 */
1828static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1829 struct kernel_lb_addr *fileset)
1da177e4 1830{
40346005 1831 sector_t last[6];
38b74a53 1832 int i;
40346005
JK		 1833 struct udf_sb_info *sbi = UDF_SB(sb);
1834 int last_count = 0;
d759bfa4 1835 int ret;
1da177e4 1836
40346005
JK		 1837 /* First try user provided anchor */
1838 if (sbi->s_anchor) {
d759bfa4
JK		 1839 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1840 if (ret != -EAGAIN)
1841 return ret;
40346005
JK		 1842 }
1843 /*
1844 * according to spec, anchor is in either:
1845 * block 256
1846 * lastblock-256
1847 * lastblock
1848 * however, if the disc isn't closed, it could be 512.
1849 */
d759bfa4
JK		 1850 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1851 if (ret != -EAGAIN)
1852 return ret;
40346005
JK		 1853 /*
1854 * The trouble is which block is the last one. Drives often misreport
1855 * this so we try various possibilities.
1856 */
d759bfa4
JK		 1857 last[last_count++] = *lastblock;
1858 if (*lastblock >= 1)
1859 last[last_count++] = *lastblock - 1;
1860 last[last_count++] = *lastblock + 1;
1861 if (*lastblock >= 2)
1862 last[last_count++] = *lastblock - 2;
1863 if (*lastblock >= 150)
1864 last[last_count++] = *lastblock - 150;
1865 if (*lastblock >= 152)
1866 last[last_count++] = *lastblock - 152;
1da177e4 1867
40346005
JK		 1868 for (i = 0; i < last_count; i++) {
1869 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1870 sb->s_blocksize_bits)
28f7c4d4 1871 continue;
d759bfa4
JK		 1872 ret = udf_check_anchor_block(sb, last[i], fileset);
1873 if (ret != -EAGAIN) {
1874 if (!ret)
1875 *lastblock = last[i];
1876 return ret;
1877 }
40346005 1878 if (last[i] < 256)
28f7c4d4 1879 continue;
d759bfa4
JK		 1880 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1881 if (ret != -EAGAIN) {
1882 if (!ret)
1883 *lastblock = last[i];
1884 return ret;
1885 }
40346005 1886 }
28f7c4d4 1887
40346005 1888 /* Finally try block 512 in case media is open */
d759bfa4 1889 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
40346005 1890}
28f7c4d4 1891
40346005
JK		 1892/*
1893 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1894 * area specified by it. The function expects sbi->s_lastblock to be the last
1895 * block on the media.
1896 *
d759bfa4
JK		 1897 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1898 * was not found.
40346005
JK		 1899 */
1900static int udf_find_anchor(struct super_block *sb,
1901 struct kernel_lb_addr *fileset)
1902{
40346005 1903 struct udf_sb_info *sbi = UDF_SB(sb);
d759bfa4
JK		 1904 sector_t lastblock = sbi->s_last_block;
1905 int ret;
28f7c4d4 1906
d759bfa4
JK		 1907 ret = udf_scan_anchors(sb, &lastblock, fileset);
1908 if (ret != -EAGAIN)
40346005 1909 goto out;
1da177e4 1910
40346005
JK		 1911 /* No anchor found? Try VARCONV conversion of block numbers */
1912 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
d759bfa4 1913 lastblock = udf_variable_to_fixed(sbi->s_last_block);
40346005 1914 /* Firstly, we try to not convert number of the last block */
d759bfa4
JK		 1915 ret = udf_scan_anchors(sb, &lastblock, fileset);
1916 if (ret != -EAGAIN)
40346005 1917 goto out;
1da177e4 1918
d759bfa4 1919 lastblock = sbi->s_last_block;
40346005 1920 /* Secondly, we try with converted number of the last block */
d759bfa4
JK		 1921 ret = udf_scan_anchors(sb, &lastblock, fileset);
1922 if (ret < 0) {
40346005
JK		 1923 /* VARCONV didn't help. Clear it. */
1924 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1da177e4 1925 }
40346005 1926out:
d759bfa4
JK		 1927 if (ret == 0)
1928 sbi->s_last_block = lastblock;
1929 return ret;
40346005 1930}
1da177e4 1931
40346005
JK		 1932/*
1933 * Check Volume Structure Descriptor, find Anchor block and load Volume
d759bfa4
JK		 1934 * Descriptor Sequence.
1935 *
1936 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1937 * block was not found.
40346005
JK		 1938 */
1939static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1940 int silent, struct kernel_lb_addr *fileset)
1941{
1942 struct udf_sb_info *sbi = UDF_SB(sb);
1943 loff_t nsr_off;
d759bfa4 1944 int ret;
40346005
JK		 1945
1946 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1947 if (!silent)
78ace70c 1948 udf_warn(sb, "Bad block size\n");
d759bfa4 1949 return -EINVAL;
40346005
JK		 1950 }
1951 sbi->s_last_block = uopt->lastblock;
1952 if (!uopt->novrs) {
1953 /* Check that it is NSR02 compliant */
1954 nsr_off = udf_check_vsd(sb);
1955 if (!nsr_off) {
1956 if (!silent)
78ace70c 1957 udf_warn(sb, "No VRS found\n");
40346005
JK		 1958 return 0;
1959 }
1960 if (nsr_off == -1)
44499602
PF		 1961 udf_debug("Failed to read sector at offset %d. "
1962 "Assuming open disc. Skipping validity "
1963 "check\n", VSD_FIRST_SECTOR_OFFSET);
40346005
JK		 1964 if (!sbi->s_last_block)
1965 sbi->s_last_block = udf_get_last_block(sb);
1966 } else {
1967 udf_debug("Validity check skipped because of novrs option\n");
28f7c4d4 1968 }
1da177e4 1969
40346005
JK		 1970 /* Look for anchor block and load Volume Descriptor Sequence */
1971 sbi->s_anchor = uopt->anchor;
d759bfa4
JK		 1972 ret = udf_find_anchor(sb, fileset);
1973 if (ret < 0) {
1974 if (!silent && ret == -EAGAIN)
78ace70c 1975 udf_warn(sb, "No anchor found\n");
d759bfa4 1976 return ret;
40346005 1977 }
d759bfa4 1978 return 0;
1da177e4
LT		 1979}
1980
1981static void udf_open_lvid(struct super_block *sb)
1982{
6c79e987
MS		 1983 struct udf_sb_info *sbi = UDF_SB(sb);
1984 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1985 struct logicalVolIntegrityDesc *lvid;
1986 struct logicalVolIntegrityDescImpUse *lvidiu;
146bca72 1987
165923fa
MS		 1988 if (!bh)
1989 return;
165923fa 1990 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
69d75671
JK		 1991 lvidiu = udf_sb_lvidiu(sb);
1992 if (!lvidiu)
1993 return;
165923fa 1994
69d75671 1995 mutex_lock(&sbi->s_alloc_mutex);
165923fa
MS		 1996 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1997 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1998 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1999 CURRENT_TIME);
146bca72 2000 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
165923fa
MS		 2001
2002 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 2003 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 2004 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 2005
2006 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2007 mark_buffer_dirty(bh);
146bca72 2008 sbi->s_lvid_dirty = 0;
949f4a7c 2009 mutex_unlock(&sbi->s_alloc_mutex);
9734c971
JK		 2010 /* Make opening of filesystem visible on the media immediately */
2011 sync_dirty_buffer(bh);
1da177e4
LT		 2012}
2013
2014static void udf_close_lvid(struct super_block *sb)
2015{
6c79e987
MS		 2016 struct udf_sb_info *sbi = UDF_SB(sb);
2017 struct buffer_head *bh = sbi->s_lvid_bh;
2018 struct logicalVolIntegrityDesc *lvid;
165923fa 2019 struct logicalVolIntegrityDescImpUse *lvidiu;
28de7948 2020
6c79e987
MS		 2021 if (!bh)
2022 return;
69d75671
JK		 2023 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2024 lvidiu = udf_sb_lvidiu(sb);
2025 if (!lvidiu)
2026 return;
6c79e987 2027
949f4a7c 2028 mutex_lock(&sbi->s_alloc_mutex);
165923fa
MS		 2029 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2030 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2031 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
2032 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2033 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2034 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2035 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2036 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2037 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2038 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2039
2040 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 2041 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 2042 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 2043
2044 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
853a0c25
JK		 2045 /*
2046 * We set buffer uptodate unconditionally here to avoid spurious
2047 * warnings from mark_buffer_dirty() when previous EIO has marked
2048 * the buffer as !uptodate
2049 */
2050 set_buffer_uptodate(bh);
165923fa 2051 mark_buffer_dirty(bh);
146bca72 2052 sbi->s_lvid_dirty = 0;
949f4a7c 2053 mutex_unlock(&sbi->s_alloc_mutex);
9734c971
JK		 2054 /* Make closing of filesystem visible on the media immediately */
2055 sync_dirty_buffer(bh);
1da177e4
LT		 2056}
2057
d664b6af
JK		 2058u64 lvid_get_unique_id(struct super_block *sb)
2059{
2060 struct buffer_head *bh;
2061 struct udf_sb_info *sbi = UDF_SB(sb);
2062 struct logicalVolIntegrityDesc *lvid;
2063 struct logicalVolHeaderDesc *lvhd;
2064 u64 uniqueID;
2065 u64 ret;
2066
2067 bh = sbi->s_lvid_bh;
2068 if (!bh)
2069 return 0;
2070
2071 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2072 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2073
2074 mutex_lock(&sbi->s_alloc_mutex);
2075 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2076 if (!(++uniqueID & 0xFFFFFFFF))
2077 uniqueID += 16;
2078 lvhd->uniqueID = cpu_to_le64(uniqueID);
2079 mutex_unlock(&sbi->s_alloc_mutex);
2080 mark_buffer_dirty(bh);
2081
2082 return ret;
1da177e4
LT		 2083}
2084
1da177e4
LT		 2085static int udf_fill_super(struct super_block *sb, void *options, int silent)
2086{
d759bfa4 2087 int ret = -EINVAL;
cb00ea35 2088 struct inode *inode = NULL;
1da177e4 2089 struct udf_options uopt;
5ca4e4be 2090 struct kernel_lb_addr rootdir, fileset;
1da177e4 2091 struct udf_sb_info *sbi;
9181f8bf 2092 bool lvid_open = false;
1da177e4
LT		 2093
2094 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
c2ba138a
EB		 2095 uopt.uid = INVALID_UID;
2096 uopt.gid = INVALID_GID;
1da177e4 2097 uopt.umask = 0;
87bc730c
MS		 2098 uopt.fmode = UDF_INVALID_MODE;
2099 uopt.dmode = UDF_INVALID_MODE;
1da177e4 2100
6c79e987 2101 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
9db9f9e3 2102 if (!sbi)
1da177e4 2103 return -ENOMEM;
28de7948 2104
1da177e4 2105 sb->s_fs_info = sbi;
1da177e4 2106
1e7933de 2107 mutex_init(&sbi->s_alloc_mutex);
1da177e4 2108
6da80894 2109 if (!udf_parse_options((char *)options, &uopt, false))
fdf2657b 2110 goto parse_options_failure;
1da177e4
LT		 2111
2112 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 2113 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
8076c363 2114 udf_err(sb, "utf8 cannot be combined with iocharset\n");
fdf2657b 2115 goto parse_options_failure;
1da177e4
LT		 2116 }
2117#ifdef CONFIG_UDF_NLS
cb00ea35 2118 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 2119 uopt.nls_map = load_nls_default();
2120 if (!uopt.nls_map)
2121 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2122 else
2123 udf_debug("Using default NLS map\n");
2124 }
2125#endif
2126 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2127 uopt.flags |= (1 << UDF_FLAG_UTF8);
2128
2129 fileset.logicalBlockNum = 0xFFFFFFFF;
2130 fileset.partitionReferenceNum = 0xFFFF;
2131
6c79e987
MS		 2132 sbi->s_flags = uopt.flags;
2133 sbi->s_uid = uopt.uid;
2134 sbi->s_gid = uopt.gid;
2135 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 2136 sbi->s_fmode = uopt.fmode;
2137 sbi->s_dmode = uopt.dmode;
6c79e987 2138 sbi->s_nls_map = uopt.nls_map;
c03cad24 2139 rwlock_init(&sbi->s_cred_lock);
1da177e4 2140
cb00ea35 2141 if (uopt.session == 0xFFFFFFFF)
6c79e987 2142 sbi->s_session = udf_get_last_session(sb);
1da177e4 2143 else
6c79e987 2144 sbi->s_session = uopt.session;
1da177e4 2145
6c79e987 2146 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 2147
40346005
JK		 2148 /* Fill in the rest of the superblock */
2149 sb->s_op = &udf_sb_ops;
2150 sb->s_export_op = &udf_export_ops;
123e9caf 2151
40346005
JK		 2152 sb->s_magic = UDF_SUPER_MAGIC;
2153 sb->s_time_gran = 1000;
2154
1197e4df 2155 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
40346005 2156 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 2157 } else {
e1defc4f 2158 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
40346005 2159 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
d759bfa4 2160 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1197e4df 2161 if (!silent)
78ace70c
JP		 2162 pr_notice("Rescanning with blocksize %d\n",
2163 UDF_DEFAULT_BLOCKSIZE);
dc141a40
AS		 2164 brelse(sbi->s_lvid_bh);
2165 sbi->s_lvid_bh = NULL;
1197e4df 2166 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
40346005 2167 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
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
6c79e987 2178 udf_debug("Lastblock=%d\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
JK		 2198 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2199 !(sb->s_flags & MS_RDONLY)) {
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
JK		 2219 UDF_PART_FLAG_READ_ONLY &&
2220 !(sb->s_flags & MS_RDONLY)) {
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 }
9181f8bf 2239 if (!(sb->s_flags & MS_RDONLY)) {
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)) {
78ace70c 2249 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\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
LT		 2325#endif
2326 if (!(sb->s_flags & MS_RDONLY))
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;
2383 int 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}
Linux kernel - Deliverables
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