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udf: Improve error recovery on mount
[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>
51#include <linux/smp_lock.h>
52#include <linux/buffer_head.h>
53#include <linux/vfs.h>
54#include <linux/vmalloc.h>
dc5d39be 55#include <linux/errno.h>
6da80894
MS		 56#include <linux/mount.h>
57#include <linux/seq_file.h>
01b954a3 58#include <linux/bitmap.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>
65#include <asm/uaccess.h>
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
1da177e4
LT		 78static char error_buf[1024];
79
80/* These are the "meat" - everything else is stuffing */
81static int udf_fill_super(struct super_block *, void *, int);
82static void udf_put_super(struct super_block *);
83static void udf_write_super(struct super_block *);
84static int udf_remount_fs(struct super_block *, int *, char *);
85static int udf_check_valid(struct super_block *, int, int);
86static int udf_vrs(struct super_block *sb, int silent);
87static int udf_load_partition(struct super_block *, kernel_lb_addr *);
1da177e4
LT		 88static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
89static void udf_find_anchor(struct super_block *);
cb00ea35
CG		 90static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
91 kernel_lb_addr *);
cb00ea35
CG		 92static void udf_load_fileset(struct super_block *, struct buffer_head *,
93 kernel_lb_addr *);
1da177e4
LT		 94static void udf_open_lvid(struct super_block *);
95static void udf_close_lvid(struct super_block *);
96static unsigned int udf_count_free(struct super_block *);
726c3342 97static int udf_statfs(struct dentry *, struct kstatfs *);
6da80894 98static int udf_show_options(struct seq_file *, struct vfsmount *);
b8145a76
AB		 99static void udf_error(struct super_block *sb, const char *function,
100 const char *fmt, ...);
1da177e4 101
6c79e987
MS		 102struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
103{
4b11111a
MS		 104 struct logicalVolIntegrityDesc *lvid =
105 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
6c79e987 106 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
4b11111a
MS		 107 __u32 offset = number_of_partitions * 2 *
108 sizeof(uint32_t)/sizeof(uint8_t);
6c79e987
MS		 109 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
110}
111
1da177e4 112/* UDF filesystem type */
454e2398 113static int udf_get_sb(struct file_system_type *fs_type,
cb00ea35
CG		 114 int flags, const char *dev_name, void *data,
115 struct vfsmount *mnt)
1da177e4 116{
454e2398 117 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
1da177e4
LT		 118}
119
120static struct file_system_type udf_fstype = {
28de7948
CG		 121 .owner = THIS_MODULE,
122 .name = "udf",
123 .get_sb = udf_get_sb,
124 .kill_sb = kill_block_super,
125 .fs_flags = FS_REQUIRES_DEV,
1da177e4
LT		 126};
127
cb00ea35 128static struct kmem_cache *udf_inode_cachep;
1da177e4
LT		 129
130static struct inode *udf_alloc_inode(struct super_block *sb)
131{
132 struct udf_inode_info *ei;
3a71fc5d 133 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
1da177e4
LT		 134 if (!ei)
135 return NULL;
95f8797f
DB		 136
137 ei->i_unique = 0;
138 ei->i_lenExtents = 0;
139 ei->i_next_alloc_block = 0;
140 ei->i_next_alloc_goal = 0;
141 ei->i_strat4096 = 0;
142
1da177e4
LT		 143 return &ei->vfs_inode;
144}
145
146static void udf_destroy_inode(struct inode *inode)
147{
148 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
149}
150
4ba9b9d0 151static void init_once(struct kmem_cache *cachep, void *foo)
1da177e4 152{
cb00ea35 153 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
1da177e4 154
a35afb83
CL		 155 ei->i_ext.i_data = NULL;
156 inode_init_once(&ei->vfs_inode);
1da177e4
LT		 157}
158
159static int init_inodecache(void)
160{
161 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
162 sizeof(struct udf_inode_info),
cb00ea35
CG		 163 0, (SLAB_RECLAIM_ACCOUNT |
164 SLAB_MEM_SPREAD),
20c2df83 165 init_once);
28de7948 166 if (!udf_inode_cachep)
1da177e4
LT		 167 return -ENOMEM;
168 return 0;
169}
170
171static void destroy_inodecache(void)
172{
1a1d92c1 173 kmem_cache_destroy(udf_inode_cachep);
1da177e4
LT		 174}
175
176/* Superblock operations */
ee9b6d61 177static const struct super_operations udf_sb_ops = {
28de7948
CG		 178 .alloc_inode = udf_alloc_inode,
179 .destroy_inode = udf_destroy_inode,
180 .write_inode = udf_write_inode,
181 .delete_inode = udf_delete_inode,
182 .clear_inode = udf_clear_inode,
183 .put_super = udf_put_super,
184 .write_super = udf_write_super,
185 .statfs = udf_statfs,
186 .remount_fs = udf_remount_fs,
6da80894 187 .show_options = udf_show_options,
1da177e4
LT		 188};
189
cb00ea35 190struct udf_options {
1da177e4
LT		 191 unsigned char novrs;
192 unsigned int blocksize;
193 unsigned int session;
194 unsigned int lastblock;
195 unsigned int anchor;
196 unsigned int volume;
197 unsigned short partition;
198 unsigned int fileset;
199 unsigned int rootdir;
200 unsigned int flags;
201 mode_t umask;
202 gid_t gid;
203 uid_t uid;
204 struct nls_table *nls_map;
205};
206
207static int __init init_udf_fs(void)
208{
209 int err;
28de7948 210
1da177e4
LT		 211 err = init_inodecache();
212 if (err)
213 goto out1;
214 err = register_filesystem(&udf_fstype);
215 if (err)
216 goto out;
28de7948 217
1da177e4 218 return 0;
28de7948
CG		 219
220out:
1da177e4 221 destroy_inodecache();
28de7948
CG		 222
223out1:
1da177e4
LT		 224 return err;
225}
226
227static void __exit exit_udf_fs(void)
228{
229 unregister_filesystem(&udf_fstype);
230 destroy_inodecache();
231}
232
233module_init(init_udf_fs)
28de7948 234module_exit(exit_udf_fs)
1da177e4 235
dc5d39be
MS		 236static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
237{
238 struct udf_sb_info *sbi = UDF_SB(sb);
239
240 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
241 GFP_KERNEL);
242 if (!sbi->s_partmaps) {
243 udf_error(sb, __FUNCTION__,
244 "Unable to allocate space for %d partition maps",
245 count);
246 sbi->s_partitions = 0;
247 return -ENOMEM;
248 }
249
250 sbi->s_partitions = count;
251 return 0;
252}
253
6da80894
MS		 254static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
255{
256 struct super_block *sb = mnt->mnt_sb;
257 struct udf_sb_info *sbi = UDF_SB(sb);
258
259 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
260 seq_puts(seq, ",nostrict");
261 if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
262 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
263 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
264 seq_puts(seq, ",unhide");
265 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
266 seq_puts(seq, ",undelete");
267 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
268 seq_puts(seq, ",noadinicb");
269 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
270 seq_puts(seq, ",shortad");
271 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
272 seq_puts(seq, ",uid=forget");
273 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
274 seq_puts(seq, ",uid=ignore");
275 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
276 seq_puts(seq, ",gid=forget");
277 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
278 seq_puts(seq, ",gid=ignore");
279 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
280 seq_printf(seq, ",uid=%u", sbi->s_uid);
281 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
282 seq_printf(seq, ",gid=%u", sbi->s_gid);
283 if (sbi->s_umask != 0)
284 seq_printf(seq, ",umask=%o", sbi->s_umask);
285 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
286 seq_printf(seq, ",session=%u", sbi->s_session);
287 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
288 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
289 /*
290 * s_anchor[2] could be zeroed out in case there is no anchor
291 * in the specified block, but then the "anchor=N" option
292 * originally given by the user wasn't effective, so it's OK
293 * if we don't show it.
294 */
295 if (sbi->s_anchor[2] != 0)
296 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
297 /*
298 * volume, partition, fileset and rootdir seem to be ignored
299 * currently
300 */
301 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
302 seq_puts(seq, ",utf8");
303 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
304 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
305
306 return 0;
307}
308
1da177e4
LT		 309/*
310 * udf_parse_options
311 *
312 * PURPOSE
313 * Parse mount options.
314 *
315 * DESCRIPTION
316 * The following mount options are supported:
317 *
318 * gid= Set the default group.
319 * umask= Set the default umask.
320 * uid= Set the default user.
321 * bs= Set the block size.
322 * unhide Show otherwise hidden files.
323 * undelete Show deleted files in lists.
324 * adinicb Embed data in the inode (default)
325 * noadinicb Don't embed data in the inode
326 * shortad Use short ad's
327 * longad Use long ad's (default)
328 * nostrict Unset strict conformance
329 * iocharset= Set the NLS character set
330 *
331 * The remaining are for debugging and disaster recovery:
332 *
28de7948 333 * novrs Skip volume sequence recognition
1da177e4
LT		 334 *
335 * The following expect a offset from 0.
336 *
337 * session= Set the CDROM session (default= last session)
338 * anchor= Override standard anchor location. (default= 256)
339 * volume= Override the VolumeDesc location. (unused)
340 * partition= Override the PartitionDesc location. (unused)
341 * lastblock= Set the last block of the filesystem/
342 *
343 * The following expect a offset from the partition root.
344 *
345 * fileset= Override the fileset block location. (unused)
346 * rootdir= Override the root directory location. (unused)
347 * WARNING: overriding the rootdir to a non-directory may
348 * yield highly unpredictable results.
349 *
350 * PRE-CONDITIONS
351 * options Pointer to mount options string.
352 * uopts Pointer to mount options variable.
353 *
354 * POST-CONDITIONS
355 * <return> 1 Mount options parsed okay.
356 * <return> 0 Error parsing mount options.
357 *
358 * HISTORY
359 * July 1, 1997 - Andrew E. Mileski
360 * Written, tested, and released.
361 */
28de7948 362
1da177e4
LT		 363enum {
364 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
365 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
366 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
367 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
368 Opt_rootdir, Opt_utf8, Opt_iocharset,
4d6660eb 369 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
1da177e4
LT		 370};
371
372static match_table_t tokens = {
28de7948
CG		 373 {Opt_novrs, "novrs"},
374 {Opt_nostrict, "nostrict"},
375 {Opt_bs, "bs=%u"},
376 {Opt_unhide, "unhide"},
377 {Opt_undelete, "undelete"},
378 {Opt_noadinicb, "noadinicb"},
379 {Opt_adinicb, "adinicb"},
380 {Opt_shortad, "shortad"},
381 {Opt_longad, "longad"},
382 {Opt_uforget, "uid=forget"},
383 {Opt_uignore, "uid=ignore"},
384 {Opt_gforget, "gid=forget"},
385 {Opt_gignore, "gid=ignore"},
386 {Opt_gid, "gid=%u"},
387 {Opt_uid, "uid=%u"},
388 {Opt_umask, "umask=%o"},
389 {Opt_session, "session=%u"},
390 {Opt_lastblock, "lastblock=%u"},
391 {Opt_anchor, "anchor=%u"},
392 {Opt_volume, "volume=%u"},
393 {Opt_partition, "partition=%u"},
394 {Opt_fileset, "fileset=%u"},
395 {Opt_rootdir, "rootdir=%u"},
396 {Opt_utf8, "utf8"},
397 {Opt_iocharset, "iocharset=%s"},
398 {Opt_err, NULL}
1da177e4
LT		 399};
400
6da80894
MS		 401static int udf_parse_options(char *options, struct udf_options *uopt,
402 bool remount)
1da177e4
LT		 403{
404 char *p;
405 int option;
406
407 uopt->novrs = 0;
6da80894 408 uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
1da177e4
LT		 409 uopt->partition = 0xFFFF;
410 uopt->session = 0xFFFFFFFF;
411 uopt->lastblock = 0;
412 uopt->anchor = 0;
413 uopt->volume = 0xFFFFFFFF;
414 uopt->rootdir = 0xFFFFFFFF;
415 uopt->fileset = 0xFFFFFFFF;
416 uopt->nls_map = NULL;
417
418 if (!options)
419 return 1;
420
cb00ea35 421 while ((p = strsep(&options, ",")) != NULL) {
1da177e4
LT		 422 substring_t args[MAX_OPT_ARGS];
423 int token;
424 if (!*p)
425 continue;
426
427 token = match_token(p, tokens, args);
cb00ea35
CG		 428 switch (token) {
429 case Opt_novrs:
430 uopt->novrs = 1;
431 case Opt_bs:
432 if (match_int(&args[0], &option))
433 return 0;
434 uopt->blocksize = option;
435 break;
436 case Opt_unhide:
437 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
438 break;
439 case Opt_undelete:
440 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
441 break;
442 case Opt_noadinicb:
443 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
444 break;
445 case Opt_adinicb:
446 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
447 break;
448 case Opt_shortad:
449 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
450 break;
451 case Opt_longad:
452 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
453 break;
454 case Opt_gid:
455 if (match_int(args, &option))
456 return 0;
457 uopt->gid = option;
ca76d2d8 458 uopt->flags |= (1 << UDF_FLAG_GID_SET);
cb00ea35
CG		 459 break;
460 case Opt_uid:
461 if (match_int(args, &option))
462 return 0;
463 uopt->uid = option;
ca76d2d8 464 uopt->flags |= (1 << UDF_FLAG_UID_SET);
cb00ea35
CG		 465 break;
466 case Opt_umask:
467 if (match_octal(args, &option))
468 return 0;
469 uopt->umask = option;
470 break;
471 case Opt_nostrict:
472 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
473 break;
474 case Opt_session:
475 if (match_int(args, &option))
476 return 0;
477 uopt->session = option;
6da80894
MS		 478 if (!remount)
479 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
cb00ea35
CG		 480 break;
481 case Opt_lastblock:
482 if (match_int(args, &option))
483 return 0;
484 uopt->lastblock = option;
6da80894
MS		 485 if (!remount)
486 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
cb00ea35
CG		 487 break;
488 case Opt_anchor:
489 if (match_int(args, &option))
490 return 0;
491 uopt->anchor = option;
492 break;
493 case Opt_volume:
494 if (match_int(args, &option))
495 return 0;
496 uopt->volume = option;
497 break;
498 case Opt_partition:
499 if (match_int(args, &option))
500 return 0;
501 uopt->partition = option;
502 break;
503 case Opt_fileset:
504 if (match_int(args, &option))
505 return 0;
506 uopt->fileset = option;
507 break;
508 case Opt_rootdir:
509 if (match_int(args, &option))
510 return 0;
511 uopt->rootdir = option;
512 break;
513 case Opt_utf8:
514 uopt->flags |= (1 << UDF_FLAG_UTF8);
515 break;
1da177e4 516#ifdef CONFIG_UDF_NLS
cb00ea35
CG		 517 case Opt_iocharset:
518 uopt->nls_map = load_nls(args[0].from);
519 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
520 break;
1da177e4 521#endif
cb00ea35
CG		 522 case Opt_uignore:
523 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
524 break;
525 case Opt_uforget:
526 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
527 break;
528 case Opt_gignore:
529 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
530 break;
531 case Opt_gforget:
532 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
533 break;
534 default:
535 printk(KERN_ERR "udf: bad mount option \"%s\" "
536 "or missing value\n", p);
1da177e4
LT		 537 return 0;
538 }
539 }
540 return 1;
541}
542
bd45a420 543static void udf_write_super(struct super_block *sb)
1da177e4
LT		 544{
545 lock_kernel();
28de7948 546
1da177e4
LT		 547 if (!(sb->s_flags & MS_RDONLY))
548 udf_open_lvid(sb);
549 sb->s_dirt = 0;
28de7948 550
1da177e4
LT		 551 unlock_kernel();
552}
553
cb00ea35 554static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
1da177e4
LT		 555{
556 struct udf_options uopt;
6c79e987 557 struct udf_sb_info *sbi = UDF_SB(sb);
1da177e4 558
6c79e987
MS		 559 uopt.flags = sbi->s_flags;
560 uopt.uid = sbi->s_uid;
561 uopt.gid = sbi->s_gid;
562 uopt.umask = sbi->s_umask;
1da177e4 563
6da80894 564 if (!udf_parse_options(options, &uopt, true))
1da177e4
LT		 565 return -EINVAL;
566
6c79e987
MS		 567 sbi->s_flags = uopt.flags;
568 sbi->s_uid = uopt.uid;
569 sbi->s_gid = uopt.gid;
570 sbi->s_umask = uopt.umask;
1da177e4 571
6c79e987
MS		 572 if (sbi->s_lvid_bh) {
573 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
1da177e4
LT		 574 if (write_rev > UDF_MAX_WRITE_VERSION)
575 *flags |= MS_RDONLY;
576 }
577
578 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
579 return 0;
580 if (*flags & MS_RDONLY)
581 udf_close_lvid(sb);
582 else
583 udf_open_lvid(sb);
584
585 return 0;
586}
587
cb00ea35 588static int udf_vrs(struct super_block *sb, int silent)
1da177e4
LT		 589{
590 struct volStructDesc *vsd = NULL;
591 int sector = 32768;
592 int sectorsize;
593 struct buffer_head *bh = NULL;
cb00ea35
CG		 594 int iso9660 = 0;
595 int nsr02 = 0;
596 int nsr03 = 0;
6c79e987 597 struct udf_sb_info *sbi;
1da177e4
LT		 598
599 /* Block size must be a multiple of 512 */
600 if (sb->s_blocksize & 511)
601 return 0;
6c79e987 602 sbi = UDF_SB(sb);
1da177e4
LT		 603
604 if (sb->s_blocksize < sizeof(struct volStructDesc))
605 sectorsize = sizeof(struct volStructDesc);
606 else
607 sectorsize = sb->s_blocksize;
608
6c79e987 609 sector += (sbi->s_session << sb->s_blocksize_bits);
1da177e4
LT		 610
611 udf_debug("Starting at sector %u (%ld byte sectors)\n",
cb00ea35 612 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
1da177e4 613 /* Process the sequence (if applicable) */
cb00ea35 614 for (; !nsr02 && !nsr03; sector += sectorsize) {
1da177e4
LT		 615 /* Read a block */
616 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
617 if (!bh)
618 break;
619
620 /* Look for ISO descriptors */
621 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 622 (sector & (sb->s_blocksize - 1)));
1da177e4 623
cb00ea35 624 if (vsd->stdIdent[0] == 0) {
3bf25cb4 625 brelse(bh);
1da177e4 626 break;
3a71fc5d
MS		 627 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
628 VSD_STD_ID_LEN)) {
1da177e4 629 iso9660 = sector;
cb00ea35
CG		 630 switch (vsd->structType) {
631 case 0:
632 udf_debug("ISO9660 Boot Record found\n");
633 break;
634 case 1:
3a71fc5d
MS		 635 udf_debug("ISO9660 Primary Volume Descriptor "
636 "found\n");
cb00ea35
CG		 637 break;
638 case 2:
3a71fc5d
MS		 639 udf_debug("ISO9660 Supplementary Volume "
640 "Descriptor found\n");
cb00ea35
CG		 641 break;
642 case 3:
3a71fc5d
MS		 643 udf_debug("ISO9660 Volume Partition Descriptor "
644 "found\n");
cb00ea35
CG		 645 break;
646 case 255:
3a71fc5d
MS		 647 udf_debug("ISO9660 Volume Descriptor Set "
648 "Terminator found\n");
cb00ea35
CG		 649 break;
650 default:
651 udf_debug("ISO9660 VRS (%u) found\n",
652 vsd->structType);
653 break;
1da177e4 654 }
3a71fc5d
MS		 655 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
656 VSD_STD_ID_LEN))
657 ; /* nothing */
658 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
659 VSD_STD_ID_LEN)) {
3bf25cb4 660 brelse(bh);
1da177e4 661 break;
3a71fc5d
MS		 662 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
663 VSD_STD_ID_LEN))
1da177e4 664 nsr02 = sector;
3a71fc5d
MS		 665 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
666 VSD_STD_ID_LEN))
1da177e4 667 nsr03 = sector;
3bf25cb4 668 brelse(bh);
1da177e4
LT		 669 }
670
671 if (nsr03)
672 return nsr03;
673 else if (nsr02)
674 return nsr02;
6c79e987 675 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
1da177e4
LT		 676 return -1;
677 else
678 return 0;
679}
680
681/*
682 * udf_find_anchor
683 *
684 * PURPOSE
685 * Find an anchor volume descriptor.
686 *
687 * PRE-CONDITIONS
688 * sb Pointer to _locked_ superblock.
689 * lastblock Last block on media.
690 *
691 * POST-CONDITIONS
692 * <return> 1 if not found, 0 if ok
693 *
694 * HISTORY
695 * July 1, 1997 - Andrew E. Mileski
696 * Written, tested, and released.
697 */
cb00ea35 698static void udf_find_anchor(struct super_block *sb)
1da177e4 699{
6c79e987 700 int lastblock;
1da177e4
LT		 701 struct buffer_head *bh = NULL;
702 uint16_t ident;
703 uint32_t location;
704 int i;
6c79e987
MS		 705 struct udf_sb_info *sbi;
706
707 sbi = UDF_SB(sb);
708 lastblock = sbi->s_last_block;
1da177e4 709
cb00ea35 710 if (lastblock) {
1da177e4 711 int varlastblock = udf_variable_to_fixed(lastblock);
28de7948
CG		 712 int last[] = { lastblock, lastblock - 2,
713 lastblock - 150, lastblock - 152,
714 varlastblock, varlastblock - 2,
715 varlastblock - 150, varlastblock - 152 };
1da177e4
LT		 716
717 lastblock = 0;
718
719 /* Search for an anchor volume descriptor pointer */
720
721 /* according to spec, anchor is in either:
722 * block 256
723 * lastblock-256
724 * lastblock
725 * however, if the disc isn't closed, it could be 512 */
726
e8c96f8c 727 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
3a71fc5d
MS		 728 ident = location = 0;
729 if (last[i] >= 0) {
730 bh = sb_bread(sb, last[i]);
731 if (bh) {
732 tag *t = (tag *)bh->b_data;
733 ident = le16_to_cpu(t->tagIdent);
734 location = le32_to_cpu(t->tagLocation);
735 brelse(bh);
736 }
1da177e4 737 }
e8c96f8c 738
cb00ea35 739 if (ident == TAG_IDENT_AVDP) {
6c79e987
MS		 740 if (location == last[i] - sbi->s_session) {
741 lastblock = last[i] - sbi->s_session;
742 sbi->s_anchor[0] = lastblock;
743 sbi->s_anchor[1] = lastblock - 256;
4b11111a
MS		 744 } else if (location ==
745 udf_variable_to_fixed(last[i]) -
746 sbi->s_session) {
1da177e4 747 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
4b11111a
MS		 748 lastblock =
749 udf_variable_to_fixed(last[i]) -
750 sbi->s_session;
6c79e987 751 sbi->s_anchor[0] = lastblock;
4b11111a
MS		 752 sbi->s_anchor[1] = lastblock - 256 -
753 sbi->s_session;
28de7948 754 } else {
4b11111a
MS		 755 udf_debug("Anchor found at block %d, "
756 "location mismatch %d.\n",
28de7948
CG		 757 last[i], location);
758 }
4b11111a
MS		 759 } else if (ident == TAG_IDENT_FE ||
760 ident == TAG_IDENT_EFE) {
1da177e4 761 lastblock = last[i];
6c79e987 762 sbi->s_anchor[3] = 512;
cb00ea35 763 } else {
3a71fc5d
MS		 764 ident = location = 0;
765 if (last[i] >= 256) {
766 bh = sb_bread(sb, last[i] - 256);
767 if (bh) {
768 tag *t = (tag *)bh->b_data;
4b11111a
MS		 769 ident = le16_to_cpu(
770 t->tagIdent);
771 location = le32_to_cpu(
772 t->tagLocation);
3a71fc5d
MS		 773 brelse(bh);
774 }
1da177e4 775 }
cb00ea35 776
1da177e4 777 if (ident == TAG_IDENT_AVDP &&
4b11111a
MS		 778 location == last[i] - 256 -
779 sbi->s_session) {
1da177e4 780 lastblock = last[i];
6c79e987 781 sbi->s_anchor[1] = last[i] - 256;
cb00ea35 782 } else {
3a71fc5d 783 ident = location = 0;
6c79e987 784 if (last[i] >= 312 + sbi->s_session) {
4b11111a
MS		 785 bh = sb_bread(sb,
786 last[i] - 312 -
787 sbi->s_session);
3a71fc5d 788 if (bh) {
4b11111a
MS		 789 tag *t = (tag *)
790 bh->b_data;
791 ident = le16_to_cpu(
792 t->tagIdent);
793 location = le32_to_cpu(
794 t->tagLocation);
3a71fc5d
MS		 795 brelse(bh);
796 }
1da177e4 797 }
cb00ea35 798
1da177e4 799 if (ident == TAG_IDENT_AVDP &&
28de7948 800 location == udf_variable_to_fixed(last[i]) - 256) {
4b11111a
MS		 801 UDF_SET_FLAG(sb,
802 UDF_FLAG_VARCONV);
28de7948 803 lastblock = udf_variable_to_fixed(last[i]);
6c79e987 804 sbi->s_anchor[1] = lastblock - 256;
1da177e4
LT		 805 }
806 }
807 }
808 }
809 }
810
cb00ea35 811 if (!lastblock) {
3a71fc5d 812 /* We haven't found the lastblock. check 312 */
6c79e987 813 bh = sb_bread(sb, 312 + sbi->s_session);
3a71fc5d
MS		 814 if (bh) {
815 tag *t = (tag *)bh->b_data;
816 ident = le16_to_cpu(t->tagIdent);
817 location = le32_to_cpu(t->tagLocation);
3bf25cb4 818 brelse(bh);
1da177e4
LT		 819
820 if (ident == TAG_IDENT_AVDP && location == 256)
821 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
822 }
823 }
824
6c79e987 825 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
165923fa
MS		 826 if (!sbi->s_anchor[i])
827 continue;
828 bh = udf_read_tagged(sb, sbi->s_anchor[i],
829 sbi->s_anchor[i], &ident);
830 if (!bh)
831 sbi->s_anchor[i] = 0;
832 else {
833 brelse(bh);
834 if ((ident != TAG_IDENT_AVDP) &&
835 (i || (ident != TAG_IDENT_FE &&
836 ident != TAG_IDENT_EFE)))
6c79e987 837 sbi->s_anchor[i] = 0;
1da177e4
LT		 838 }
839 }
840
6c79e987 841 sbi->s_last_block = lastblock;
1da177e4
LT		 842}
843
3a71fc5d
MS		 844static int udf_find_fileset(struct super_block *sb,
845 kernel_lb_addr *fileset,
846 kernel_lb_addr *root)
1da177e4
LT		 847{
848 struct buffer_head *bh = NULL;
849 long lastblock;
850 uint16_t ident;
6c79e987 851 struct udf_sb_info *sbi;
1da177e4
LT		 852
853 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 854 fileset->partitionReferenceNum != 0xFFFF) {
1da177e4
LT		 855 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
856
28de7948 857 if (!bh) {
1da177e4 858 return 1;
28de7948 859 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 860 brelse(bh);
1da177e4
LT		 861 return 1;
862 }
cb00ea35 863
1da177e4
LT		 864 }
865
6c79e987 866 sbi = UDF_SB(sb);
3a71fc5d
MS		 867 if (!bh) {
868 /* Search backwards through the partitions */
1da177e4
LT		 869 kernel_lb_addr newfileset;
870
28de7948 871/* --> cvg: FIXME - is it reasonable? */
1da177e4 872 return 1;
cb00ea35 873
6c79e987 874 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 875 (newfileset.partitionReferenceNum != 0xFFFF &&
876 fileset->logicalBlockNum == 0xFFFFFFFF &&
877 fileset->partitionReferenceNum == 0xFFFF);
878 newfileset.partitionReferenceNum--) {
6c79e987
MS		 879 lastblock = sbi->s_partmaps
880 [newfileset.partitionReferenceNum]
881 .s_partition_len;
1da177e4
LT		 882 newfileset.logicalBlockNum = 0;
883
cb00ea35 884 do {
3a71fc5d
MS		 885 bh = udf_read_ptagged(sb, newfileset, 0,
886 &ident);
cb00ea35
CG		 887 if (!bh) {
888 newfileset.logicalBlockNum++;
1da177e4
LT		 889 continue;
890 }
891
cb00ea35
CG		 892 switch (ident) {
893 case TAG_IDENT_SBD:
28de7948
CG		 894 {
895 struct spaceBitmapDesc *sp;
4b11111a
MS		 896 sp = (struct spaceBitmapDesc *)
897 bh->b_data;
28de7948
CG		 898 newfileset.logicalBlockNum += 1 +
899 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 900 sizeof(struct spaceBitmapDesc)
901 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 902 brelse(bh);
903 break;
904 }
cb00ea35 905 case TAG_IDENT_FSD:
28de7948
CG		 906 *fileset = newfileset;
907 break;
cb00ea35 908 default:
28de7948
CG		 909 newfileset.logicalBlockNum++;
910 brelse(bh);
911 bh = NULL;
912 break;
1da177e4 913 }
28de7948
CG		 914 } while (newfileset.logicalBlockNum < lastblock &&
915 fileset->logicalBlockNum == 0xFFFFFFFF &&
916 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 917 }
918 }
919
920 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 921 fileset->partitionReferenceNum != 0xFFFF) && bh) {
1da177e4 922 udf_debug("Fileset at block=%d, partition=%d\n",
cb00ea35
CG		 923 fileset->logicalBlockNum,
924 fileset->partitionReferenceNum);
1da177e4 925
6c79e987 926 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 927 udf_load_fileset(sb, bh, root);
3bf25cb4 928 brelse(bh);
1da177e4
LT		 929 return 0;
930 }
931 return 1;
932}
933
c0eb31ed 934static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 935{
936 struct primaryVolDesc *pvoldesc;
1da177e4
LT		 937 struct ustr instr;
938 struct ustr outstr;
c0eb31ed
JK		 939 struct buffer_head *bh;
940 uint16_t ident;
941
942 bh = udf_read_tagged(sb, block, block, &ident);
943 if (!bh)
944 return 1;
945 BUG_ON(ident != TAG_IDENT_PVD);
1da177e4
LT		 946
947 pvoldesc = (struct primaryVolDesc *)bh->b_data;
948
56774805
MS		 949 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
950 pvoldesc->recordingDateAndTime)) {
af15a298
MS		 951#ifdef UDFFS_DEBUG
952 timestamp *ts = &pvoldesc->recordingDateAndTime;
cbf5676a 953 udf_debug("recording time %04u/%02u/%02u"
3a71fc5d 954 " %02u:%02u (%x)\n",
af15a298
MS		 955 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
956 ts->minute, le16_to_cpu(ts->typeAndTimezone));
957#endif
1da177e4
LT		 958 }
959
4b11111a 960 if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
cb00ea35 961 if (udf_CS0toUTF8(&outstr, &instr)) {
6c79e987 962 strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
1da177e4 963 outstr.u_len > 31 ? 31 : outstr.u_len);
4b11111a
MS		 964 udf_debug("volIdent[] = '%s'\n",
965 UDF_SB(sb)->s_volume_ident);
1da177e4 966 }
1da177e4 967
4b11111a 968 if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
1da177e4
LT		 969 if (udf_CS0toUTF8(&outstr, &instr))
970 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
c0eb31ed
JK		 971
972 brelse(bh);
973 return 0;
1da177e4
LT		 974}
975
28de7948
CG		 976static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
977 kernel_lb_addr *root)
1da177e4
LT		 978{
979 struct fileSetDesc *fset;
980
981 fset = (struct fileSetDesc *)bh->b_data;
982
983 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
984
6c79e987 985 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 986
cb00ea35
CG		 987 udf_debug("Rootdir at block=%d, partition=%d\n",
988 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 989}
990
883cb9d1
MS		 991int udf_compute_nr_groups(struct super_block *sb, u32 partition)
992{
993 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 994 return DIV_ROUND_UP(map->s_partition_len +
995 (sizeof(struct spaceBitmapDesc) << 3),
996 sb->s_blocksize * 8);
883cb9d1
MS		 997}
998
66e1da3f
MS		 999static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1000{
66e1da3f
MS		 1001 struct udf_bitmap *bitmap;
1002 int nr_groups;
1003 int size;
1004
883cb9d1 1005 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 1006 size = sizeof(struct udf_bitmap) +
1007 (sizeof(struct buffer_head *) * nr_groups);
1008
1009 if (size <= PAGE_SIZE)
1010 bitmap = kmalloc(size, GFP_KERNEL);
1011 else
1012 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1013
1014 if (bitmap == NULL) {
1015 udf_error(sb, __FUNCTION__,
1016 "Unable to allocate space for bitmap "
1017 "and %d buffer_head pointers", nr_groups);
1018 return NULL;
1019 }
1020
1021 memset(bitmap, 0x00, size);
1022 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1023 bitmap->s_nr_groups = nr_groups;
1024 return bitmap;
1025}
1026
c0eb31ed 1027static int udf_load_partdesc(struct super_block *sb, sector_t block)
1da177e4 1028{
c0eb31ed 1029 struct buffer_head *bh;
165923fa 1030 struct partitionHeaderDesc *phd;
c0eb31ed 1031 struct partitionDesc *p;
6c79e987 1032 struct udf_part_map *map;
165923fa
MS		 1033 struct udf_sb_info *sbi = UDF_SB(sb);
1034 bool found = false;
1035 int i;
c0eb31ed
JK		 1036 uint16_t partitionNumber;
1037 uint16_t ident;
1038 int ret = 0;
1da177e4 1039
c0eb31ed
JK		 1040 bh = udf_read_tagged(sb, block, block, &ident);
1041 if (!bh)
1042 return 1;
1043 if (ident != TAG_IDENT_PD)
1044 goto out_bh;
1045
1046 p = (struct partitionDesc *)bh->b_data;
1047 partitionNumber = le16_to_cpu(p->partitionNumber);
6c79e987
MS		 1048 for (i = 0; i < sbi->s_partitions; i++) {
1049 map = &sbi->s_partmaps[i];
cb00ea35 1050 udf_debug("Searching map: (%d == %d)\n",
165923fa
MS		 1051 map->s_partition_num, partitionNumber);
1052 found = map->s_partition_num == partitionNumber;
1053 if (found)
1da177e4 1054 break;
1da177e4 1055 }
165923fa
MS		 1056
1057 if (!found) {
cb00ea35 1058 udf_debug("Partition (%d) not found in partition map\n",
165923fa 1059 partitionNumber);
c0eb31ed 1060 goto out_bh;
165923fa
MS		 1061 }
1062
1063 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1064 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1065
1066 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1067 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1068 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1069 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1070 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1071 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1072 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1073 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1074
1075 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1076 "block length %d\n", partitionNumber, i,
1077 map->s_partition_type, map->s_partition_root,
1078 map->s_partition_len);
1079
1080 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1081 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
c0eb31ed 1082 goto out_bh;
165923fa
MS		 1083
1084 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1085 if (phd->unallocSpaceTable.extLength) {
1086 kernel_lb_addr loc = {
1087 .logicalBlockNum = le32_to_cpu(
1088 phd->unallocSpaceTable.extPosition),
1089 .partitionReferenceNum = i,
1090 };
1091
1092 map->s_uspace.s_table = udf_iget(sb, loc);
1093 if (!map->s_uspace.s_table) {
1094 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1095 i);
c0eb31ed
JK		 1096 ret = 1;
1097 goto out_bh;
165923fa
MS		 1098 }
1099 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1100 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1101 i, map->s_uspace.s_table->i_ino);
1102 }
1103
1104 if (phd->unallocSpaceBitmap.extLength) {
1105 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, i);
2e0838fd
JK		 1106 if (!bitmap) {
1107 ret = 1;
1108 goto out_bh;
1109 }
165923fa 1110 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1111 bitmap->s_extLength = le32_to_cpu(
165923fa 1112 phd->unallocSpaceBitmap.extLength);
2e0838fd 1113 bitmap->s_extPosition = le32_to_cpu(
165923fa 1114 phd->unallocSpaceBitmap.extPosition);
2e0838fd
JK		 1115 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1116 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", i,
1117 bitmap->s_extPosition);
165923fa
MS		 1118 }
1119
1120 if (phd->partitionIntegrityTable.extLength)
1121 udf_debug("partitionIntegrityTable (part %d)\n", i);
1122
1123 if (phd->freedSpaceTable.extLength) {
1124 kernel_lb_addr loc = {
1125 .logicalBlockNum = le32_to_cpu(
1126 phd->freedSpaceTable.extPosition),
1127 .partitionReferenceNum = i,
1128 };
1129
1130 map->s_fspace.s_table = udf_iget(sb, loc);
1131 if (!map->s_fspace.s_table) {
1132 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
c0eb31ed
JK		 1133 ret = 1;
1134 goto out_bh;
165923fa
MS		 1135 }
1136
1137 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1138 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1139 i, map->s_fspace.s_table->i_ino);
1140 }
1141
1142 if (phd->freedSpaceBitmap.extLength) {
1143 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, i);
2e0838fd
JK		 1144 if (!bitmap) {
1145 ret = 1;
1146 goto out_bh;
1147 }
165923fa 1148 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1149 bitmap->s_extLength = le32_to_cpu(
165923fa 1150 phd->freedSpaceBitmap.extLength);
2e0838fd 1151 bitmap->s_extPosition = le32_to_cpu(
165923fa 1152 phd->freedSpaceBitmap.extPosition);
2e0838fd
JK		 1153 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1154 udf_debug("freedSpaceBitmap (part %d) @ %d\n", i,
1155 bitmap->s_extPosition);
165923fa
MS		 1156 }
1157
c0eb31ed 1158out_bh:
2e0838fd 1159 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1160 brelse(bh);
1161 return ret;
1da177e4
LT		 1162}
1163
c0eb31ed 1164static int udf_load_logicalvol(struct super_block *sb, sector_t block,
28de7948 1165 kernel_lb_addr *fileset)
1da177e4
LT		 1166{
1167 struct logicalVolDesc *lvd;
1168 int i, j, offset;
1169 uint8_t type;
6c79e987 1170 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1171 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1172 uint16_t ident;
1173 struct buffer_head *bh;
1174 int ret = 0;
1da177e4 1175
c0eb31ed
JK		 1176 bh = udf_read_tagged(sb, block, block, &ident);
1177 if (!bh)
1178 return 1;
1179 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4
LT		 1180 lvd = (struct logicalVolDesc *)bh->b_data;
1181
dc5d39be 1182 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
c0eb31ed
JK		 1183 if (i != 0) {
1184 ret = i;
1185 goto out_bh;
1186 }
1da177e4 1187
cb00ea35 1188 for (i = 0, offset = 0;
6c79e987 1189 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
4b11111a
MS		 1190 i++, offset += gpm->partitionMapLength) {
1191 struct udf_part_map *map = &sbi->s_partmaps[i];
1192 gpm = (struct genericPartitionMap *)
1193 &(lvd->partitionMaps[offset]);
1194 type = gpm->partitionMapType;
cb00ea35 1195 if (type == 1) {
4b11111a
MS		 1196 struct genericPartitionMap1 *gpm1 =
1197 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1198 map->s_partition_type = UDF_TYPE1_MAP15;
1199 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1200 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1201 map->s_partition_func = NULL;
cb00ea35 1202 } else if (type == 2) {
4b11111a
MS		 1203 struct udfPartitionMap2 *upm2 =
1204 (struct udfPartitionMap2 *)gpm;
1205 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1206 strlen(UDF_ID_VIRTUAL))) {
1207 u16 suf =
1208 le16_to_cpu(((__le16 *)upm2->partIdent.
1209 identSuffix)[0]);
1210 if (suf == 0x0150) {
1211 map->s_partition_type =
1212 UDF_VIRTUAL_MAP15;
1213 map->s_partition_func =
1214 udf_get_pblock_virt15;
1215 } else if (suf == 0x0200) {
1216 map->s_partition_type =
1217 UDF_VIRTUAL_MAP20;
1218 map->s_partition_func =
1219 udf_get_pblock_virt20;
1da177e4 1220 }
4b11111a
MS		 1221 } else if (!strncmp(upm2->partIdent.ident,
1222 UDF_ID_SPARABLE,
1223 strlen(UDF_ID_SPARABLE))) {
1da177e4 1224 uint32_t loc;
1da177e4 1225 struct sparingTable *st;
4b11111a
MS		 1226 struct sparablePartitionMap *spm =
1227 (struct sparablePartitionMap *)gpm;
28de7948 1228
6c79e987 1229 map->s_partition_type = UDF_SPARABLE_MAP15;
4b11111a
MS		 1230 map->s_type_specific.s_sparing.s_packet_len =
1231 le16_to_cpu(spm->packetLength);
cb00ea35 1232 for (j = 0; j < spm->numSparingTables; j++) {
4b11111a
MS		 1233 struct buffer_head *bh2;
1234
1235 loc = le32_to_cpu(
1236 spm->locSparingTable[j]);
1237 bh2 = udf_read_tagged(sb, loc, loc,
1238 &ident);
1239 map->s_type_specific.s_sparing.
1240 s_spar_map[j] = bh2;
1241
165923fa
MS		 1242 if (bh2 == NULL)
1243 continue;
1244
1245 st = (struct sparingTable *)bh2->b_data;
1246 if (ident != 0 || strncmp(
1247 st->sparingIdent.ident,
1248 UDF_ID_SPARING,
1249 strlen(UDF_ID_SPARING))) {
1250 brelse(bh2);
1251 map->s_type_specific.s_sparing.
1252 s_spar_map[j] = NULL;
1da177e4
LT		 1253 }
1254 }
6c79e987 1255 map->s_partition_func = udf_get_pblock_spar15;
cb00ea35 1256 } else {
3a71fc5d
MS		 1257 udf_debug("Unknown ident: %s\n",
1258 upm2->partIdent.ident);
1da177e4
LT		 1259 continue;
1260 }
6c79e987
MS		 1261 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1262 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4
LT		 1263 }
1264 udf_debug("Partition (%d:%d) type %d on volume %d\n",
6c79e987
MS		 1265 i, map->s_partition_num, type,
1266 map->s_volumeseqnum);
1da177e4
LT		 1267 }
1268
cb00ea35 1269 if (fileset) {
28de7948 1270 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1271
1272 *fileset = lelb_to_cpu(la->extLocation);
3a71fc5d
MS		 1273 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1274 "partition=%d\n", fileset->logicalBlockNum,
28de7948 1275 fileset->partitionReferenceNum);
1da177e4
LT		 1276 }
1277 if (lvd->integritySeqExt.extLength)
1278 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
28de7948 1279
c0eb31ed
JK		 1280out_bh:
1281 brelse(bh);
1282 return ret;
1da177e4
LT		 1283}
1284
1285/*
1286 * udf_load_logicalvolint
1287 *
1288 */
cb00ea35 1289static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1da177e4
LT		 1290{
1291 struct buffer_head *bh = NULL;
1292 uint16_t ident;
6c79e987
MS		 1293 struct udf_sb_info *sbi = UDF_SB(sb);
1294 struct logicalVolIntegrityDesc *lvid;
1da177e4
LT		 1295
1296 while (loc.extLength > 0 &&
cb00ea35
CG		 1297 (bh = udf_read_tagged(sb, loc.extLocation,
1298 loc.extLocation, &ident)) &&
1299 ident == TAG_IDENT_LVID) {
6c79e987
MS		 1300 sbi->s_lvid_bh = bh;
1301 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
cb00ea35 1302
6c79e987 1303 if (lvid->nextIntegrityExt.extLength)
3a71fc5d 1304 udf_load_logicalvolint(sb,
6c79e987 1305 leea_to_cpu(lvid->nextIntegrityExt));
cb00ea35 1306
6c79e987 1307 if (sbi->s_lvid_bh != bh)
3bf25cb4 1308 brelse(bh);
1da177e4 1309 loc.extLength -= sb->s_blocksize;
cb00ea35 1310 loc.extLocation++;
1da177e4 1311 }
6c79e987 1312 if (sbi->s_lvid_bh != bh)
3bf25cb4 1313 brelse(bh);
1da177e4
LT		 1314}
1315
1316/*
1317 * udf_process_sequence
1318 *
1319 * PURPOSE
1320 * Process a main/reserve volume descriptor sequence.
1321 *
1322 * PRE-CONDITIONS
1323 * sb Pointer to _locked_ superblock.
1324 * block First block of first extent of the sequence.
1325 * lastblock Lastblock of first extent of the sequence.
1326 *
1327 * HISTORY
1328 * July 1, 1997 - Andrew E. Mileski
1329 * Written, tested, and released.
1330 */
200a3592 1331static noinline int udf_process_sequence(struct super_block *sb, long block,
3a71fc5d 1332 long lastblock, kernel_lb_addr *fileset)
1da177e4
LT		 1333{
1334 struct buffer_head *bh = NULL;
1335 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1336 struct udf_vds_record *curr;
1da177e4
LT		 1337 struct generic_desc *gd;
1338 struct volDescPtr *vdp;
cb00ea35 1339 int done = 0;
1da177e4
LT		 1340 uint32_t vdsn;
1341 uint16_t ident;
1342 long next_s = 0, next_e = 0;
1343
1344 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1345
c0eb31ed
JK		 1346 /*
1347 * Read the main descriptor sequence and find which descriptors
1348 * are in it.
1349 */
cb00ea35 1350 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1351
1352 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed
JK		 1353 if (!bh) {
1354 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1355 "sequence is corrupted or we could not read "
1356 "it.\n", (unsigned long long)block);
1357 return 1;
1358 }
1da177e4
LT		 1359
1360 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1361 gd = (struct generic_desc *)bh->b_data;
1362 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1363 switch (ident) {
28de7948 1364 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1365 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1366 if (vdsn >= curr->volDescSeqNum) {
1367 curr->volDescSeqNum = vdsn;
1368 curr->block = block;
cb00ea35
CG		 1369 }
1370 break;
28de7948 1371 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
4b11111a
MS		 1372 curr = &vds[VDS_POS_VOL_DESC_PTR];
1373 if (vdsn >= curr->volDescSeqNum) {
1374 curr->volDescSeqNum = vdsn;
1375 curr->block = block;
cb00ea35
CG		 1376
1377 vdp = (struct volDescPtr *)bh->b_data;
4b11111a
MS		 1378 next_s = le32_to_cpu(
1379 vdp->nextVolDescSeqExt.extLocation);
1380 next_e = le32_to_cpu(
1381 vdp->nextVolDescSeqExt.extLength);
cb00ea35
CG		 1382 next_e = next_e >> sb->s_blocksize_bits;
1383 next_e += next_s;
1384 }
1385 break;
28de7948 1386 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1387 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1388 if (vdsn >= curr->volDescSeqNum) {
1389 curr->volDescSeqNum = vdsn;
1390 curr->block = block;
cb00ea35
CG		 1391 }
1392 break;
28de7948 1393 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1394 curr = &vds[VDS_POS_PARTITION_DESC];
1395 if (!curr->block)
1396 curr->block = block;
cb00ea35 1397 break;
28de7948 1398 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1399 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1400 if (vdsn >= curr->volDescSeqNum) {
1401 curr->volDescSeqNum = vdsn;
1402 curr->block = block;
cb00ea35
CG		 1403 }
1404 break;
28de7948 1405 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1406 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1407 if (vdsn >= curr->volDescSeqNum) {
1408 curr->volDescSeqNum = vdsn;
1409 curr->block = block;
cb00ea35
CG		 1410 }
1411 break;
28de7948 1412 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
cb00ea35
CG		 1413 vds[VDS_POS_TERMINATING_DESC].block = block;
1414 if (next_e) {
1415 block = next_s;
1416 lastblock = next_e;
1417 next_s = next_e = 0;
4b11111a 1418 } else
cb00ea35
CG		 1419 done = 1;
1420 break;
1da177e4 1421 }
3bf25cb4 1422 brelse(bh);
1da177e4 1423 }
c0eb31ed
JK		 1424 /*
1425 * Now read interesting descriptors again and process them
1426 * in a suitable order
1427 */
1428 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1429 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1430 return 1;
1431 }
1432 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1433 return 1;
165923fa 1434
c0eb31ed
JK		 1435 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1436 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1437 return 1;
165923fa 1438
c0eb31ed
JK		 1439 if (vds[VDS_POS_PARTITION_DESC].block) {
1440 /*
1441 * We rescan the whole descriptor sequence to find
1442 * partition descriptor blocks and process them.
1443 */
1444 for (block = vds[VDS_POS_PARTITION_DESC].block;
1445 block < vds[VDS_POS_TERMINATING_DESC].block;
1446 block++)
1447 if (udf_load_partdesc(sb, block))
165923fa 1448 return 1;
1da177e4
LT		 1449 }
1450
1451 return 0;
1452}
1453
1454/*
1455 * udf_check_valid()
1456 */
cb00ea35 1457static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1da177e4
LT		 1458{
1459 long block;
d0db181c 1460 struct udf_sb_info *sbi = UDF_SB(sb);
1da177e4 1461
cb00ea35 1462 if (novrs) {
1da177e4
LT		 1463 udf_debug("Validity check skipped because of novrs option\n");
1464 return 0;
1465 }
1466 /* Check that it is NSR02 compliant */
1467 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
165923fa 1468 block = udf_vrs(sb, silent);
d0db181c
PE		 1469 if (block == -1)
1470 udf_debug("Failed to read byte 32768. Assuming open "
1471 "disc. Skipping validity check\n");
1472 if (block && !sbi->s_last_block)
165923fa 1473 sbi->s_last_block = udf_get_last_block(sb);
d0db181c 1474 return !block;
1da177e4
LT		 1475}
1476
28de7948 1477static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1da177e4
LT		 1478{
1479 struct anchorVolDescPtr *anchor;
1480 uint16_t ident;
1481 struct buffer_head *bh;
1482 long main_s, main_e, reserve_s, reserve_e;
1483 int i, j;
6c79e987 1484 struct udf_sb_info *sbi;
1da177e4
LT		 1485
1486 if (!sb)
1487 return 1;
6c79e987 1488 sbi = UDF_SB(sb);
1da177e4 1489
6c79e987 1490 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
28f7c4d4
MS		 1491 if (!sbi->s_anchor[i])
1492 continue;
165923fa 1493
28f7c4d4
MS		 1494 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1495 &ident);
1496 if (!bh)
1497 continue;
1498
1499 anchor = (struct anchorVolDescPtr *)bh->b_data;
1500
1501 /* Locate the main sequence */
1502 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1503 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1504 main_e = main_e >> sb->s_blocksize_bits;
1505 main_e += main_s;
1506
1507 /* Locate the reserve sequence */
1508 reserve_s = le32_to_cpu(
4b11111a 1509 anchor->reserveVolDescSeqExt.extLocation);
28f7c4d4 1510 reserve_e = le32_to_cpu(
4b11111a 1511 anchor->reserveVolDescSeqExt.extLength);
28f7c4d4
MS		 1512 reserve_e = reserve_e >> sb->s_blocksize_bits;
1513 reserve_e += reserve_s;
1da177e4 1514
28f7c4d4 1515 brelse(bh);
1da177e4 1516
28f7c4d4
MS		 1517 /* Process the main & reserve sequences */
1518 /* responsible for finding the PartitionDesc(s) */
1519 if (!(udf_process_sequence(sb, main_s, main_e,
1520 fileset) &&
1521 udf_process_sequence(sb, reserve_s, reserve_e,
1522 fileset)))
1523 break;
1da177e4
LT		 1524 }
1525
6c79e987 1526 if (i == ARRAY_SIZE(sbi->s_anchor)) {
1da177e4
LT		 1527 udf_debug("No Anchor block found\n");
1528 return 1;
28f7c4d4
MS		 1529 }
1530 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1da177e4 1531
6c79e987 1532 for (i = 0; i < sbi->s_partitions; i++) {
28de7948 1533 kernel_lb_addr uninitialized_var(ino);
6c79e987 1534 struct udf_part_map *map = &sbi->s_partmaps[i];
1da177e4 1535
165923fa
MS		 1536 if (map->s_partition_type != UDF_VIRTUAL_MAP15 &&
1537 map->s_partition_type != UDF_VIRTUAL_MAP20)
1538 continue;
1da177e4 1539
165923fa
MS		 1540 if (!sbi->s_last_block) {
1541 sbi->s_last_block = udf_get_last_block(sb);
1542 udf_find_anchor(sb);
1543 }
1544
1545 if (!sbi->s_last_block) {
1546 udf_debug("Unable to determine Lastblock (For "
1547 "Virtual Partition)\n");
1548 return 1;
1549 }
1550
1551 for (j = 0; j < sbi->s_partitions; j++) {
1552 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1553 if (j != i &&
1554 map->s_volumeseqnum ==
1555 map2->s_volumeseqnum &&
1556 map->s_partition_num ==
1557 map2->s_partition_num) {
1558 ino.partitionReferenceNum = j;
1559 ino.logicalBlockNum =
1560 sbi->s_last_block -
1561 map2->s_partition_root;
1562 break;
28de7948 1563 }
165923fa 1564 }
1da177e4 1565
165923fa
MS		 1566 if (j == sbi->s_partitions)
1567 return 1;
1da177e4 1568
165923fa
MS		 1569 sbi->s_vat_inode = udf_iget(sb, ino);
1570 if (!sbi->s_vat_inode)
1571 return 1;
1da177e4 1572
165923fa
MS		 1573 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1574 map->s_type_specific.s_virtual.s_start_offset =
1575 udf_ext0_offset(sbi->s_vat_inode);
1576 map->s_type_specific.s_virtual.s_num_entries =
1577 (sbi->s_vat_inode->i_size - 36) >> 2;
1578 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1579 uint32_t pos;
1580 struct virtualAllocationTable20 *vat20;
1581
1582 pos = udf_block_map(sbi->s_vat_inode, 0);
1583 bh = sb_bread(sb, pos);
1584 if (!bh)
1585 return 1;
1586 vat20 = (struct virtualAllocationTable20 *)
1587 bh->b_data +
1588 udf_ext0_offset(sbi->s_vat_inode);
1589 map->s_type_specific.s_virtual.s_start_offset =
1590 le16_to_cpu(vat20->lengthHeader) +
1591 udf_ext0_offset(sbi->s_vat_inode);
1592 map->s_type_specific.s_virtual.s_num_entries =
1593 (sbi->s_vat_inode->i_size -
1594 map->s_type_specific.s_virtual.
1595 s_start_offset) >> 2;
1596 brelse(bh);
1da177e4 1597 }
165923fa
MS		 1598 map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1599 map->s_partition_len =
1600 sbi->s_partmaps[ino.partitionReferenceNum].
1601 s_partition_len;
1da177e4
LT		 1602 }
1603 return 0;
1604}
1605
1606static void udf_open_lvid(struct super_block *sb)
1607{
6c79e987
MS		 1608 struct udf_sb_info *sbi = UDF_SB(sb);
1609 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1610 struct logicalVolIntegrityDesc *lvid;
1611 struct logicalVolIntegrityDescImpUse *lvidiu;
1612 if (!bh)
1613 return;
1614
1615 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1616 lvidiu = udf_sb_lvidiu(sbi);
1617
1618 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1619 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1620 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1621 CURRENT_TIME);
1622 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1623
1624 lvid->descTag.descCRC = cpu_to_le16(
1625 udf_crc((char *)lvid + sizeof(tag),
1626 le16_to_cpu(lvid->descTag.descCRCLength), 0));
1627
1628 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1629 mark_buffer_dirty(bh);
1da177e4
LT		 1630}
1631
1632static void udf_close_lvid(struct super_block *sb)
1633{
6c79e987
MS		 1634 struct udf_sb_info *sbi = UDF_SB(sb);
1635 struct buffer_head *bh = sbi->s_lvid_bh;
1636 struct logicalVolIntegrityDesc *lvid;
165923fa 1637 struct logicalVolIntegrityDescImpUse *lvidiu;
28de7948 1638
6c79e987
MS		 1639 if (!bh)
1640 return;
1641
1642 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1643
165923fa
MS		 1644 if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1645 return;
1646
1647 lvidiu = udf_sb_lvidiu(sbi);
1648 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1649 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1650 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1651 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1652 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1653 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1654 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1655 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1656 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1657 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1658
1659 lvid->descTag.descCRC = cpu_to_le16(
1660 udf_crc((char *)lvid + sizeof(tag),
1661 le16_to_cpu(lvid->descTag.descCRCLength),
1662 0));
1663
1664 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1665 mark_buffer_dirty(bh);
1da177e4
LT		 1666}
1667
66e1da3f
MS		 1668static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1669{
1670 int i;
1671 int nr_groups = bitmap->s_nr_groups;
4b11111a
MS		 1672 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1673 nr_groups);
66e1da3f
MS		 1674
1675 for (i = 0; i < nr_groups; i++)
1676 if (bitmap->s_block_bitmap[i])
1677 brelse(bitmap->s_block_bitmap[i]);
1678
1679 if (size <= PAGE_SIZE)
1680 kfree(bitmap);
1681 else
1682 vfree(bitmap);
1683}
1684
2e0838fd
JK		 1685static void udf_free_partition(struct udf_part_map *map)
1686{
1687 int i;
1688
1689 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1690 iput(map->s_uspace.s_table);
1691 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1692 iput(map->s_fspace.s_table);
1693 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1694 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1695 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1696 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1697 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1698 for (i = 0; i < 4; i++)
1699 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1700}
1701
1da177e4
LT		 1702static int udf_fill_super(struct super_block *sb, void *options, int silent)
1703{
1704 int i;
cb00ea35 1705 struct inode *inode = NULL;
1da177e4
LT		 1706 struct udf_options uopt;
1707 kernel_lb_addr rootdir, fileset;
1708 struct udf_sb_info *sbi;
1709
1710 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1711 uopt.uid = -1;
1712 uopt.gid = -1;
1713 uopt.umask = 0;
1714
6c79e987 1715 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1da177e4
LT		 1716 if (!sbi)
1717 return -ENOMEM;
28de7948 1718
1da177e4 1719 sb->s_fs_info = sbi;
1da177e4 1720
1e7933de 1721 mutex_init(&sbi->s_alloc_mutex);
1da177e4 1722
6da80894 1723 if (!udf_parse_options((char *)options, &uopt, false))
1da177e4
LT		 1724 goto error_out;
1725
1726 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 1727 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1da177e4 1728 udf_error(sb, "udf_read_super",
cb00ea35 1729 "utf8 cannot be combined with iocharset\n");
1da177e4
LT		 1730 goto error_out;
1731 }
1732#ifdef CONFIG_UDF_NLS
cb00ea35 1733 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 1734 uopt.nls_map = load_nls_default();
1735 if (!uopt.nls_map)
1736 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1737 else
1738 udf_debug("Using default NLS map\n");
1739 }
1740#endif
1741 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1742 uopt.flags |= (1 << UDF_FLAG_UTF8);
1743
1744 fileset.logicalBlockNum = 0xFFFFFFFF;
1745 fileset.partitionReferenceNum = 0xFFFF;
1746
6c79e987
MS		 1747 sbi->s_flags = uopt.flags;
1748 sbi->s_uid = uopt.uid;
1749 sbi->s_gid = uopt.gid;
1750 sbi->s_umask = uopt.umask;
1751 sbi->s_nls_map = uopt.nls_map;
1da177e4
LT		 1752
1753 /* Set the block size for all transfers */
f1f73ba8
CH		 1754 if (!sb_min_blocksize(sb, uopt.blocksize)) {
1755 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1756 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1da177e4 1757 goto error_out;
f1f73ba8 1758 }
1da177e4 1759
cb00ea35 1760 if (uopt.session == 0xFFFFFFFF)
6c79e987 1761 sbi->s_session = udf_get_last_session(sb);
1da177e4 1762 else
6c79e987 1763 sbi->s_session = uopt.session;
1da177e4 1764
6c79e987 1765 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 1766
6c79e987
MS		 1767 sbi->s_last_block = uopt.lastblock;
1768 sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1769 sbi->s_anchor[2] = uopt.anchor;
1770 sbi->s_anchor[3] = 256;
1da177e4 1771
3a71fc5d
MS		 1772 if (udf_check_valid(sb, uopt.novrs, silent)) {
1773 /* read volume recognition sequences */
1774 printk(KERN_WARNING "UDF-fs: No VRS found\n");
cb00ea35 1775 goto error_out;
1da177e4
LT		 1776 }
1777
1778 udf_find_anchor(sb);
1779
1780 /* Fill in the rest of the superblock */
1781 sb->s_op = &udf_sb_ops;
1782 sb->dq_op = NULL;
1783 sb->s_dirt = 0;
1784 sb->s_magic = UDF_SUPER_MAGIC;
1785 sb->s_time_gran = 1000;
1786
cb00ea35 1787 if (udf_load_partition(sb, &fileset)) {
3a71fc5d 1788 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1da177e4
LT		 1789 goto error_out;
1790 }
1791
6c79e987 1792 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1da177e4 1793
6c79e987 1794 if (sbi->s_lvid_bh) {
4b11111a
MS		 1795 struct logicalVolIntegrityDescImpUse *lvidiu =
1796 udf_sb_lvidiu(sbi);
6c79e987
MS		 1797 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1798 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
4b11111a
MS		 1799 /* uint16_t maxUDFWriteRev =
1800 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1da177e4 1801
cb00ea35 1802 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
4b11111a
MS		 1803 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1804 "(max is %x)\n",
6c79e987 1805 le16_to_cpu(lvidiu->minUDFReadRev),
cb00ea35 1806 UDF_MAX_READ_VERSION);
1da177e4 1807 goto error_out;
4b11111a 1808 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1da177e4 1809 sb->s_flags |= MS_RDONLY;
1da177e4 1810
6c79e987 1811 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 1812
1813 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1814 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1815 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1816 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1817 }
1818
6c79e987 1819 if (!sbi->s_partitions) {
3a71fc5d 1820 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1da177e4
LT		 1821 goto error_out;
1822 }
1823
4b11111a
MS		 1824 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1825 UDF_PART_FLAG_READ_ONLY) {
1826 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1827 "forcing readonly mount\n");
39b3f6d6 1828 sb->s_flags |= MS_RDONLY;
c1a26e7d 1829 }
39b3f6d6 1830
cb00ea35 1831 if (udf_find_fileset(sb, &fileset, &rootdir)) {
3a71fc5d 1832 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1da177e4
LT		 1833 goto error_out;
1834 }
1835
cb00ea35 1836 if (!silent) {
56774805
MS		 1837 timestamp ts;
1838 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
a9ca6635 1839 udf_info("UDF: Mounting volume '%s', "
28de7948 1840 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
56774805
MS		 1841 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1842 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4
LT		 1843 }
1844 if (!(sb->s_flags & MS_RDONLY))
1845 udf_open_lvid(sb);
1846
1847 /* Assign the root inode */
1848 /* assign inodes by physical block number */
1849 /* perhaps it's not extensible enough, but for now ... */
cb00ea35
CG		 1850 inode = udf_iget(sb, rootdir);
1851 if (!inode) {
4b11111a
MS		 1852 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1853 "partition=%d\n",
cb00ea35 1854 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1da177e4
LT		 1855 goto error_out;
1856 }
1857
1858 /* Allocate a dentry for the root inode */
1859 sb->s_root = d_alloc_root(inode);
cb00ea35 1860 if (!sb->s_root) {
3a71fc5d 1861 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1da177e4
LT		 1862 iput(inode);
1863 goto error_out;
1864 }
31170b6a 1865 sb->s_maxbytes = MAX_LFS_FILESIZE;
1da177e4
LT		 1866 return 0;
1867
28de7948 1868error_out:
6c79e987
MS		 1869 if (sbi->s_vat_inode)
1870 iput(sbi->s_vat_inode);
2e0838fd
JK		 1871 if (sbi->s_partitions)
1872 for (i = 0; i < sbi->s_partitions; i++)
1873 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 1874#ifdef CONFIG_UDF_NLS
1875 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 1876 unload_nls(sbi->s_nls_map);
1da177e4
LT		 1877#endif
1878 if (!(sb->s_flags & MS_RDONLY))
1879 udf_close_lvid(sb);
6c79e987
MS		 1880 brelse(sbi->s_lvid_bh);
1881
1882 kfree(sbi->s_partmaps);
1da177e4
LT		 1883 kfree(sbi);
1884 sb->s_fs_info = NULL;
28de7948 1885
1da177e4
LT		 1886 return -EINVAL;
1887}
1888
b8145a76
AB		 1889static void udf_error(struct super_block *sb, const char *function,
1890 const char *fmt, ...)
1da177e4
LT		 1891{
1892 va_list args;
1893
cb00ea35 1894 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 1895 /* mark sb error */
1896 sb->s_dirt = 1;
1897 }
1898 va_start(args, fmt);
4a6e617a 1899 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 1900 va_end(args);
3a71fc5d 1901 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
28de7948 1902 sb->s_id, function, error_buf);
1da177e4
LT		 1903}
1904
1905void udf_warning(struct super_block *sb, const char *function,
cb00ea35 1906 const char *fmt, ...)
1da177e4
LT		 1907{
1908 va_list args;
1909
cb00ea35 1910 va_start(args, fmt);
4a6e617a 1911 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4
LT		 1912 va_end(args);
1913 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
cb00ea35 1914 sb->s_id, function, error_buf);
1da177e4
LT		 1915}
1916
cb00ea35 1917static void udf_put_super(struct super_block *sb)
1da177e4
LT		 1918{
1919 int i;
6c79e987 1920 struct udf_sb_info *sbi;
1da177e4 1921
6c79e987
MS		 1922 sbi = UDF_SB(sb);
1923 if (sbi->s_vat_inode)
1924 iput(sbi->s_vat_inode);
2e0838fd
JK		 1925 if (sbi->s_partitions)
1926 for (i = 0; i < sbi->s_partitions; i++)
1927 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 1928#ifdef CONFIG_UDF_NLS
1929 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 1930 unload_nls(sbi->s_nls_map);
1da177e4
LT		 1931#endif
1932 if (!(sb->s_flags & MS_RDONLY))
1933 udf_close_lvid(sb);
6c79e987
MS		 1934 brelse(sbi->s_lvid_bh);
1935 kfree(sbi->s_partmaps);
1da177e4
LT		 1936 kfree(sb->s_fs_info);
1937 sb->s_fs_info = NULL;
1938}
1939
cb00ea35 1940static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 1941{
726c3342 1942 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 1943 struct udf_sb_info *sbi = UDF_SB(sb);
1944 struct logicalVolIntegrityDescImpUse *lvidiu;
1945
1946 if (sbi->s_lvid_bh != NULL)
1947 lvidiu = udf_sb_lvidiu(sbi);
1948 else
1949 lvidiu = NULL;
726c3342 1950
1da177e4
LT		 1951 buf->f_type = UDF_SUPER_MAGIC;
1952 buf->f_bsize = sb->s_blocksize;
6c79e987 1953 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 1954 buf->f_bfree = udf_count_free(sb);
1955 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 1956 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1957 le32_to_cpu(lvidiu->numDirs)) : 0)
1958 + buf->f_bfree;
1da177e4
LT		 1959 buf->f_ffree = buf->f_bfree;
1960 /* __kernel_fsid_t f_fsid */
cb00ea35 1961 buf->f_namelen = UDF_NAME_LEN - 2;
1da177e4
LT		 1962
1963 return 0;
1964}
1965
4b11111a
MS		 1966static unsigned int udf_count_free_bitmap(struct super_block *sb,
1967 struct udf_bitmap *bitmap)
1da177e4
LT		 1968{
1969 struct buffer_head *bh = NULL;
1970 unsigned int accum = 0;
1971 int index;
1972 int block = 0, newblock;
1973 kernel_lb_addr loc;
1974 uint32_t bytes;
1da177e4
LT		 1975 uint8_t *ptr;
1976 uint16_t ident;
1977 struct spaceBitmapDesc *bm;
1978
1979 lock_kernel();
1980
1981 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 1982 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1da177e4
LT		 1983 bh = udf_read_ptagged(sb, loc, 0, &ident);
1984
cb00ea35 1985 if (!bh) {
1da177e4
LT		 1986 printk(KERN_ERR "udf: udf_count_free failed\n");
1987 goto out;
cb00ea35 1988 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 1989 brelse(bh);
1da177e4
LT		 1990 printk(KERN_ERR "udf: udf_count_free failed\n");
1991 goto out;
1992 }
1993
1994 bm = (struct spaceBitmapDesc *)bh->b_data;
1995 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 1996 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1997 ptr = (uint8_t *)bh->b_data;
1da177e4 1998
cb00ea35 1999 while (bytes > 0) {
01b954a3
MS		 2000 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2001 accum += bitmap_weight((const unsigned long *)(ptr + index),
2002 cur_bytes * 8);
2003 bytes -= cur_bytes;
cb00ea35 2004 if (bytes) {
3bf25cb4 2005 brelse(bh);
1da177e4
LT		 2006 newblock = udf_get_lb_pblock(sb, loc, ++block);
2007 bh = udf_tread(sb, newblock);
cb00ea35 2008 if (!bh) {
1da177e4
LT		 2009 udf_debug("read failed\n");
2010 goto out;
2011 }
2012 index = 0;
28de7948 2013 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2014 }
2015 }
3bf25cb4 2016 brelse(bh);
1da177e4 2017
28de7948 2018out:
1da177e4
LT		 2019 unlock_kernel();
2020
2021 return accum;
2022}
2023
4b11111a
MS		 2024static unsigned int udf_count_free_table(struct super_block *sb,
2025 struct inode *table)
1da177e4
LT		 2026{
2027 unsigned int accum = 0;
ff116fc8
JK		 2028 uint32_t elen;
2029 kernel_lb_addr eloc;
1da177e4 2030 int8_t etype;
ff116fc8 2031 struct extent_position epos;
1da177e4
LT		 2032
2033 lock_kernel();
2034
c0b34438 2035 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2036 epos.offset = sizeof(struct unallocSpaceEntry);
2037 epos.bh = NULL;
1da177e4 2038
3a71fc5d 2039 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2040 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2041
3bf25cb4 2042 brelse(epos.bh);
1da177e4
LT		 2043
2044 unlock_kernel();
2045
2046 return accum;
2047}
cb00ea35
CG		 2048
2049static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2050{
2051 unsigned int accum = 0;
6c79e987
MS		 2052 struct udf_sb_info *sbi;
2053 struct udf_part_map *map;
1da177e4 2054
6c79e987
MS		 2055 sbi = UDF_SB(sb);
2056 if (sbi->s_lvid_bh) {
4b11111a
MS		 2057 struct logicalVolIntegrityDesc *lvid =
2058 (struct logicalVolIntegrityDesc *)
2059 sbi->s_lvid_bh->b_data;
6c79e987 2060 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2061 accum = le32_to_cpu(
2062 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2063 if (accum == 0xFFFFFFFF)
2064 accum = 0;
2065 }
2066 }
2067
2068 if (accum)
2069 return accum;
2070
6c79e987
MS		 2071 map = &sbi->s_partmaps[sbi->s_partition];
2072 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2073 accum += udf_count_free_bitmap(sb,
6c79e987 2074 map->s_uspace.s_bitmap);
1da177e4 2075 }
6c79e987 2076 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2077 accum += udf_count_free_bitmap(sb,
6c79e987 2078 map->s_fspace.s_bitmap);
1da177e4
LT		 2079 }
2080 if (accum)
2081 return accum;
2082
6c79e987 2083 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2084 accum += udf_count_free_table(sb,
6c79e987 2085 map->s_uspace.s_table);
1da177e4 2086 }
6c79e987 2087 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2088 accum += udf_count_free_table(sb,
6c79e987 2089 map->s_fspace.s_table);
1da177e4
LT		 2090 }
2091
2092 return accum;
2093}
Linux kernel - Deliverables
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