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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>
f845fced 59#include <linux/crc-itu-t.h>
1da177e4
LT		 60#include <asm/byteorder.h>
61
1da177e4
LT		 62#include "udf_sb.h"
63#include "udf_i.h"
64
65#include <linux/init.h>
66#include <asm/uaccess.h>
67
68#define VDS_POS_PRIMARY_VOL_DESC 0
69#define VDS_POS_UNALLOC_SPACE_DESC 1
70#define VDS_POS_LOGICAL_VOL_DESC 2
71#define VDS_POS_PARTITION_DESC 3
72#define VDS_POS_IMP_USE_VOL_DESC 4
73#define VDS_POS_VOL_DESC_PTR 5
74#define VDS_POS_TERMINATING_DESC 6
75#define VDS_POS_LENGTH 7
76
6da80894
MS		 77#define UDF_DEFAULT_BLOCKSIZE 2048
78
1da177e4
LT		 79static char error_buf[1024];
80
81/* These are the "meat" - everything else is stuffing */
82static int udf_fill_super(struct super_block *, void *, int);
83static void udf_put_super(struct super_block *);
146bca72 84static int udf_sync_fs(struct super_block *, int);
1da177e4 85static int udf_remount_fs(struct super_block *, int *, char *);
5ca4e4be 86static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
5ca4e4be
PE		 87static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
88 struct kernel_lb_addr *);
cb00ea35 89static void udf_load_fileset(struct super_block *, struct buffer_head *,
5ca4e4be 90 struct kernel_lb_addr *);
1da177e4
LT		 91static void udf_open_lvid(struct super_block *);
92static void udf_close_lvid(struct super_block *);
93static unsigned int udf_count_free(struct super_block *);
726c3342 94static int udf_statfs(struct dentry *, struct kstatfs *);
6da80894 95static int udf_show_options(struct seq_file *, struct vfsmount *);
b8145a76
AB		 96static void udf_error(struct super_block *sb, const char *function,
97 const char *fmt, ...);
1da177e4 98
6c79e987
MS		 99struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
100{
4b11111a
MS		 101 struct logicalVolIntegrityDesc *lvid =
102 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
6c79e987 103 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
4b11111a
MS		 104 __u32 offset = number_of_partitions * 2 *
105 sizeof(uint32_t)/sizeof(uint8_t);
6c79e987
MS		 106 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
107}
108
1da177e4 109/* UDF filesystem type */
454e2398 110static int udf_get_sb(struct file_system_type *fs_type,
cb00ea35
CG		 111 int flags, const char *dev_name, void *data,
112 struct vfsmount *mnt)
1da177e4 113{
454e2398 114 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
1da177e4
LT		 115}
116
117static struct file_system_type udf_fstype = {
28de7948
CG		 118 .owner = THIS_MODULE,
119 .name = "udf",
120 .get_sb = udf_get_sb,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
1da177e4
LT		 123};
124
cb00ea35 125static struct kmem_cache *udf_inode_cachep;
1da177e4
LT		 126
127static struct inode *udf_alloc_inode(struct super_block *sb)
128{
129 struct udf_inode_info *ei;
3a71fc5d 130 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
1da177e4
LT		 131 if (!ei)
132 return NULL;
95f8797f
DB		 133
134 ei->i_unique = 0;
135 ei->i_lenExtents = 0;
136 ei->i_next_alloc_block = 0;
137 ei->i_next_alloc_goal = 0;
138 ei->i_strat4096 = 0;
139
1da177e4
LT		 140 return &ei->vfs_inode;
141}
142
143static void udf_destroy_inode(struct inode *inode)
144{
145 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
146}
147
51cc5068 148static void init_once(void *foo)
1da177e4 149{
cb00ea35 150 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
1da177e4 151
a35afb83
CL		 152 ei->i_ext.i_data = NULL;
153 inode_init_once(&ei->vfs_inode);
1da177e4
LT		 154}
155
156static int init_inodecache(void)
157{
158 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
159 sizeof(struct udf_inode_info),
cb00ea35
CG		 160 0, (SLAB_RECLAIM_ACCOUNT |
161 SLAB_MEM_SPREAD),
20c2df83 162 init_once);
28de7948 163 if (!udf_inode_cachep)
1da177e4
LT		 164 return -ENOMEM;
165 return 0;
166}
167
168static void destroy_inodecache(void)
169{
1a1d92c1 170 kmem_cache_destroy(udf_inode_cachep);
1da177e4
LT		 171}
172
173/* Superblock operations */
ee9b6d61 174static const struct super_operations udf_sb_ops = {
28de7948
CG		 175 .alloc_inode = udf_alloc_inode,
176 .destroy_inode = udf_destroy_inode,
177 .write_inode = udf_write_inode,
178 .delete_inode = udf_delete_inode,
179 .clear_inode = udf_clear_inode,
180 .put_super = udf_put_super,
146bca72 181 .sync_fs = udf_sync_fs,
28de7948
CG		 182 .statfs = udf_statfs,
183 .remount_fs = udf_remount_fs,
6da80894 184 .show_options = udf_show_options,
1da177e4
LT		 185};
186
cb00ea35 187struct udf_options {
1da177e4
LT		 188 unsigned char novrs;
189 unsigned int blocksize;
190 unsigned int session;
191 unsigned int lastblock;
192 unsigned int anchor;
193 unsigned int volume;
194 unsigned short partition;
195 unsigned int fileset;
196 unsigned int rootdir;
197 unsigned int flags;
198 mode_t umask;
199 gid_t gid;
200 uid_t uid;
7ac9bcd5
MS		 201 mode_t fmode;
202 mode_t dmode;
1da177e4
LT		 203 struct nls_table *nls_map;
204};
205
206static int __init init_udf_fs(void)
207{
208 int err;
28de7948 209
1da177e4
LT		 210 err = init_inodecache();
211 if (err)
212 goto out1;
213 err = register_filesystem(&udf_fstype);
214 if (err)
215 goto out;
28de7948 216
1da177e4 217 return 0;
28de7948
CG		 218
219out:
1da177e4 220 destroy_inodecache();
28de7948
CG		 221
222out1:
1da177e4
LT		 223 return err;
224}
225
226static void __exit exit_udf_fs(void)
227{
228 unregister_filesystem(&udf_fstype);
229 destroy_inodecache();
230}
231
232module_init(init_udf_fs)
28de7948 233module_exit(exit_udf_fs)
1da177e4 234
dc5d39be
MS		 235static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
236{
237 struct udf_sb_info *sbi = UDF_SB(sb);
238
239 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
240 GFP_KERNEL);
241 if (!sbi->s_partmaps) {
8e24eea7 242 udf_error(sb, __func__,
dc5d39be
MS		 243 "Unable to allocate space for %d partition maps",
244 count);
245 sbi->s_partitions = 0;
246 return -ENOMEM;
247 }
248
249 sbi->s_partitions = count;
250 return 0;
251}
252
6da80894
MS		 253static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
254{
255 struct super_block *sb = mnt->mnt_sb;
256 struct udf_sb_info *sbi = UDF_SB(sb);
257
258 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
259 seq_puts(seq, ",nostrict");
1197e4df 260 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
6da80894
MS		 261 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
262 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263 seq_puts(seq, ",unhide");
264 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
265 seq_puts(seq, ",undelete");
266 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
267 seq_puts(seq, ",noadinicb");
268 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
269 seq_puts(seq, ",shortad");
270 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
271 seq_puts(seq, ",uid=forget");
272 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
273 seq_puts(seq, ",uid=ignore");
274 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
275 seq_puts(seq, ",gid=forget");
276 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
277 seq_puts(seq, ",gid=ignore");
278 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
279 seq_printf(seq, ",uid=%u", sbi->s_uid);
280 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
281 seq_printf(seq, ",gid=%u", sbi->s_gid);
282 if (sbi->s_umask != 0)
283 seq_printf(seq, ",umask=%o", sbi->s_umask);
87bc730c 284 if (sbi->s_fmode != UDF_INVALID_MODE)
7ac9bcd5 285 seq_printf(seq, ",mode=%o", sbi->s_fmode);
87bc730c 286 if (sbi->s_dmode != UDF_INVALID_MODE)
7ac9bcd5 287 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
6da80894
MS		 288 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
289 seq_printf(seq, ",session=%u", sbi->s_session);
290 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
291 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
40346005
JK		 292 if (sbi->s_anchor != 0)
293 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
6da80894
MS		 294 /*
295 * volume, partition, fileset and rootdir seem to be ignored
296 * currently
297 */
298 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
299 seq_puts(seq, ",utf8");
300 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
301 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
302
303 return 0;
304}
305
1da177e4
LT		 306/*
307 * udf_parse_options
308 *
309 * PURPOSE
310 * Parse mount options.
311 *
312 * DESCRIPTION
313 * The following mount options are supported:
314 *
315 * gid= Set the default group.
316 * umask= Set the default umask.
7ac9bcd5
MS		 317 * mode= Set the default file permissions.
318 * dmode= Set the default directory permissions.
1da177e4
LT		 319 * uid= Set the default user.
320 * bs= Set the block size.
321 * unhide Show otherwise hidden files.
322 * undelete Show deleted files in lists.
323 * adinicb Embed data in the inode (default)
324 * noadinicb Don't embed data in the inode
325 * shortad Use short ad's
326 * longad Use long ad's (default)
327 * nostrict Unset strict conformance
328 * iocharset= Set the NLS character set
329 *
330 * The remaining are for debugging and disaster recovery:
331 *
28de7948 332 * novrs Skip volume sequence recognition
1da177e4
LT		 333 *
334 * The following expect a offset from 0.
335 *
336 * session= Set the CDROM session (default= last session)
337 * anchor= Override standard anchor location. (default= 256)
338 * volume= Override the VolumeDesc location. (unused)
339 * partition= Override the PartitionDesc location. (unused)
340 * lastblock= Set the last block of the filesystem/
341 *
342 * The following expect a offset from the partition root.
343 *
344 * fileset= Override the fileset block location. (unused)
345 * rootdir= Override the root directory location. (unused)
346 * WARNING: overriding the rootdir to a non-directory may
347 * yield highly unpredictable results.
348 *
349 * PRE-CONDITIONS
350 * options Pointer to mount options string.
351 * uopts Pointer to mount options variable.
352 *
353 * POST-CONDITIONS
354 * <return> 1 Mount options parsed okay.
355 * <return> 0 Error parsing mount options.
356 *
357 * HISTORY
358 * July 1, 1997 - Andrew E. Mileski
359 * Written, tested, and released.
360 */
28de7948 361
1da177e4
LT		 362enum {
363 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
364 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
365 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
366 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
367 Opt_rootdir, Opt_utf8, Opt_iocharset,
7ac9bcd5
MS		 368 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
369 Opt_fmode, Opt_dmode
1da177e4
LT		 370};
371
a447c093 372static const 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"},
7ac9bcd5
MS		 398 {Opt_fmode, "mode=%o"},
399 {Opt_dmode, "dmode=%o"},
28de7948 400 {Opt_err, NULL}
1da177e4
LT		 401};
402
6da80894
MS		 403static int udf_parse_options(char *options, struct udf_options *uopt,
404 bool remount)
1da177e4
LT		 405{
406 char *p;
407 int option;
408
409 uopt->novrs = 0;
1da177e4
LT		 410 uopt->partition = 0xFFFF;
411 uopt->session = 0xFFFFFFFF;
412 uopt->lastblock = 0;
413 uopt->anchor = 0;
414 uopt->volume = 0xFFFFFFFF;
415 uopt->rootdir = 0xFFFFFFFF;
416 uopt->fileset = 0xFFFFFFFF;
417 uopt->nls_map = NULL;
418
419 if (!options)
420 return 1;
421
cb00ea35 422 while ((p = strsep(&options, ",")) != NULL) {
1da177e4
LT		 423 substring_t args[MAX_OPT_ARGS];
424 int token;
425 if (!*p)
426 continue;
427
428 token = match_token(p, tokens, args);
cb00ea35
CG		 429 switch (token) {
430 case Opt_novrs:
431 uopt->novrs = 1;
4136801a 432 break;
cb00ea35
CG		 433 case Opt_bs:
434 if (match_int(&args[0], &option))
435 return 0;
436 uopt->blocksize = option;
1197e4df 437 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
cb00ea35
CG		 438 break;
439 case Opt_unhide:
440 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
441 break;
442 case Opt_undelete:
443 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
444 break;
445 case Opt_noadinicb:
446 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
447 break;
448 case Opt_adinicb:
449 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
450 break;
451 case Opt_shortad:
452 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
453 break;
454 case Opt_longad:
455 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
456 break;
457 case Opt_gid:
458 if (match_int(args, &option))
459 return 0;
460 uopt->gid = option;
ca76d2d8 461 uopt->flags |= (1 << UDF_FLAG_GID_SET);
cb00ea35
CG		 462 break;
463 case Opt_uid:
464 if (match_int(args, &option))
465 return 0;
466 uopt->uid = option;
ca76d2d8 467 uopt->flags |= (1 << UDF_FLAG_UID_SET);
cb00ea35
CG		 468 break;
469 case Opt_umask:
470 if (match_octal(args, &option))
471 return 0;
472 uopt->umask = option;
473 break;
474 case Opt_nostrict:
475 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
476 break;
477 case Opt_session:
478 if (match_int(args, &option))
479 return 0;
480 uopt->session = option;
6da80894
MS		 481 if (!remount)
482 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
cb00ea35
CG		 483 break;
484 case Opt_lastblock:
485 if (match_int(args, &option))
486 return 0;
487 uopt->lastblock = option;
6da80894
MS		 488 if (!remount)
489 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
cb00ea35
CG		 490 break;
491 case Opt_anchor:
492 if (match_int(args, &option))
493 return 0;
494 uopt->anchor = option;
495 break;
496 case Opt_volume:
497 if (match_int(args, &option))
498 return 0;
499 uopt->volume = option;
500 break;
501 case Opt_partition:
502 if (match_int(args, &option))
503 return 0;
504 uopt->partition = option;
505 break;
506 case Opt_fileset:
507 if (match_int(args, &option))
508 return 0;
509 uopt->fileset = option;
510 break;
511 case Opt_rootdir:
512 if (match_int(args, &option))
513 return 0;
514 uopt->rootdir = option;
515 break;
516 case Opt_utf8:
517 uopt->flags |= (1 << UDF_FLAG_UTF8);
518 break;
1da177e4 519#ifdef CONFIG_UDF_NLS
cb00ea35
CG		 520 case Opt_iocharset:
521 uopt->nls_map = load_nls(args[0].from);
522 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
523 break;
1da177e4 524#endif
cb00ea35
CG		 525 case Opt_uignore:
526 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
527 break;
528 case Opt_uforget:
529 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
530 break;
531 case Opt_gignore:
532 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
533 break;
534 case Opt_gforget:
535 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
536 break;
7ac9bcd5
MS		 537 case Opt_fmode:
538 if (match_octal(args, &option))
539 return 0;
540 uopt->fmode = option & 0777;
541 break;
542 case Opt_dmode:
543 if (match_octal(args, &option))
544 return 0;
545 uopt->dmode = option & 0777;
546 break;
cb00ea35
CG		 547 default:
548 printk(KERN_ERR "udf: bad mount option \"%s\" "
549 "or missing value\n", p);
1da177e4
LT		 550 return 0;
551 }
552 }
553 return 1;
554}
555
cb00ea35 556static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
1da177e4
LT		 557{
558 struct udf_options uopt;
6c79e987 559 struct udf_sb_info *sbi = UDF_SB(sb);
1da177e4 560
6c79e987
MS		 561 uopt.flags = sbi->s_flags;
562 uopt.uid = sbi->s_uid;
563 uopt.gid = sbi->s_gid;
564 uopt.umask = sbi->s_umask;
7ac9bcd5
MS		 565 uopt.fmode = sbi->s_fmode;
566 uopt.dmode = sbi->s_dmode;
1da177e4 567
6da80894 568 if (!udf_parse_options(options, &uopt, true))
1da177e4
LT		 569 return -EINVAL;
570
337eb00a 571 lock_kernel();
6c79e987
MS		 572 sbi->s_flags = uopt.flags;
573 sbi->s_uid = uopt.uid;
574 sbi->s_gid = uopt.gid;
575 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 576 sbi->s_fmode = uopt.fmode;
577 sbi->s_dmode = uopt.dmode;
1da177e4 578
6c79e987
MS		 579 if (sbi->s_lvid_bh) {
580 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
1da177e4
LT		 581 if (write_rev > UDF_MAX_WRITE_VERSION)
582 *flags |= MS_RDONLY;
583 }
584
337eb00a
AIB		 585 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
586 unlock_kernel();
1da177e4 587 return 0;
337eb00a 588 }
1da177e4
LT		 589 if (*flags & MS_RDONLY)
590 udf_close_lvid(sb);
591 else
592 udf_open_lvid(sb);
593
337eb00a 594 unlock_kernel();
1da177e4
LT		 595 return 0;
596}
597
40346005
JK		 598/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
599/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
600static loff_t udf_check_vsd(struct super_block *sb)
1da177e4
LT		 601{
602 struct volStructDesc *vsd = NULL;
f4bcbbd9 603 loff_t sector = 32768;
1da177e4
LT		 604 int sectorsize;
605 struct buffer_head *bh = NULL;
cb00ea35
CG		 606 int nsr02 = 0;
607 int nsr03 = 0;
6c79e987 608 struct udf_sb_info *sbi;
1da177e4 609
6c79e987 610 sbi = UDF_SB(sb);
1da177e4
LT		 611 if (sb->s_blocksize < sizeof(struct volStructDesc))
612 sectorsize = sizeof(struct volStructDesc);
613 else
614 sectorsize = sb->s_blocksize;
615
6c79e987 616 sector += (sbi->s_session << sb->s_blocksize_bits);
1da177e4
LT		 617
618 udf_debug("Starting at sector %u (%ld byte sectors)\n",
706047a7
SM		 619 (unsigned int)(sector >> sb->s_blocksize_bits),
620 sb->s_blocksize);
1da177e4 621 /* Process the sequence (if applicable) */
cb00ea35 622 for (; !nsr02 && !nsr03; sector += sectorsize) {
1da177e4
LT		 623 /* Read a block */
624 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
625 if (!bh)
626 break;
627
628 /* Look for ISO descriptors */
629 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 630 (sector & (sb->s_blocksize - 1)));
1da177e4 631
cb00ea35 632 if (vsd->stdIdent[0] == 0) {
3bf25cb4 633 brelse(bh);
1da177e4 634 break;
3a71fc5d
MS		 635 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
636 VSD_STD_ID_LEN)) {
cb00ea35
CG		 637 switch (vsd->structType) {
638 case 0:
639 udf_debug("ISO9660 Boot Record found\n");
640 break;
641 case 1:
3a71fc5d
MS		 642 udf_debug("ISO9660 Primary Volume Descriptor "
643 "found\n");
cb00ea35
CG		 644 break;
645 case 2:
3a71fc5d
MS		 646 udf_debug("ISO9660 Supplementary Volume "
647 "Descriptor found\n");
cb00ea35
CG		 648 break;
649 case 3:
3a71fc5d
MS		 650 udf_debug("ISO9660 Volume Partition Descriptor "
651 "found\n");
cb00ea35
CG		 652 break;
653 case 255:
3a71fc5d
MS		 654 udf_debug("ISO9660 Volume Descriptor Set "
655 "Terminator found\n");
cb00ea35
CG		 656 break;
657 default:
658 udf_debug("ISO9660 VRS (%u) found\n",
659 vsd->structType);
660 break;
1da177e4 661 }
3a71fc5d
MS		 662 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
663 VSD_STD_ID_LEN))
664 ; /* nothing */
665 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
666 VSD_STD_ID_LEN)) {
3bf25cb4 667 brelse(bh);
1da177e4 668 break;
3a71fc5d
MS		 669 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
670 VSD_STD_ID_LEN))
1da177e4 671 nsr02 = sector;
3a71fc5d
MS		 672 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
673 VSD_STD_ID_LEN))
1da177e4 674 nsr03 = sector;
3bf25cb4 675 brelse(bh);
1da177e4
LT		 676 }
677
678 if (nsr03)
679 return nsr03;
680 else if (nsr02)
681 return nsr02;
6c79e987 682 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
1da177e4
LT		 683 return -1;
684 else
685 return 0;
686}
687
3a71fc5d 688static int udf_find_fileset(struct super_block *sb,
5ca4e4be
PE		 689 struct kernel_lb_addr *fileset,
690 struct kernel_lb_addr *root)
1da177e4
LT		 691{
692 struct buffer_head *bh = NULL;
693 long lastblock;
694 uint16_t ident;
6c79e987 695 struct udf_sb_info *sbi;
1da177e4
LT		 696
697 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 698 fileset->partitionReferenceNum != 0xFFFF) {
97e961fd 699 bh = udf_read_ptagged(sb, fileset, 0, &ident);
1da177e4 700
28de7948 701 if (!bh) {
1da177e4 702 return 1;
28de7948 703 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 704 brelse(bh);
1da177e4
LT		 705 return 1;
706 }
cb00ea35 707
1da177e4
LT		 708 }
709
6c79e987 710 sbi = UDF_SB(sb);
3a71fc5d
MS		 711 if (!bh) {
712 /* Search backwards through the partitions */
5ca4e4be 713 struct kernel_lb_addr newfileset;
1da177e4 714
28de7948 715/* --> cvg: FIXME - is it reasonable? */
1da177e4 716 return 1;
cb00ea35 717
6c79e987 718 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 719 (newfileset.partitionReferenceNum != 0xFFFF &&
720 fileset->logicalBlockNum == 0xFFFFFFFF &&
721 fileset->partitionReferenceNum == 0xFFFF);
722 newfileset.partitionReferenceNum--) {
6c79e987
MS		 723 lastblock = sbi->s_partmaps
724 [newfileset.partitionReferenceNum]
725 .s_partition_len;
1da177e4
LT		 726 newfileset.logicalBlockNum = 0;
727
cb00ea35 728 do {
97e961fd 729 bh = udf_read_ptagged(sb, &newfileset, 0,
3a71fc5d 730 &ident);
cb00ea35
CG		 731 if (!bh) {
732 newfileset.logicalBlockNum++;
1da177e4
LT		 733 continue;
734 }
735
cb00ea35
CG		 736 switch (ident) {
737 case TAG_IDENT_SBD:
28de7948
CG		 738 {
739 struct spaceBitmapDesc *sp;
4b11111a
MS		 740 sp = (struct spaceBitmapDesc *)
741 bh->b_data;
28de7948
CG		 742 newfileset.logicalBlockNum += 1 +
743 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 744 sizeof(struct spaceBitmapDesc)
745 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 746 brelse(bh);
747 break;
748 }
cb00ea35 749 case TAG_IDENT_FSD:
28de7948
CG		 750 *fileset = newfileset;
751 break;
cb00ea35 752 default:
28de7948
CG		 753 newfileset.logicalBlockNum++;
754 brelse(bh);
755 bh = NULL;
756 break;
1da177e4 757 }
28de7948
CG		 758 } while (newfileset.logicalBlockNum < lastblock &&
759 fileset->logicalBlockNum == 0xFFFFFFFF &&
760 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 761 }
762 }
763
764 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 765 fileset->partitionReferenceNum != 0xFFFF) && bh) {
1da177e4 766 udf_debug("Fileset at block=%d, partition=%d\n",
cb00ea35
CG		 767 fileset->logicalBlockNum,
768 fileset->partitionReferenceNum);
1da177e4 769
6c79e987 770 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 771 udf_load_fileset(sb, bh, root);
3bf25cb4 772 brelse(bh);
1da177e4
LT		 773 return 0;
774 }
775 return 1;
776}
777
c0eb31ed 778static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 779{
780 struct primaryVolDesc *pvoldesc;
ba9aadd8 781 struct ustr *instr, *outstr;
c0eb31ed
JK		 782 struct buffer_head *bh;
783 uint16_t ident;
ba9aadd8
MS		 784 int ret = 1;
785
786 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
787 if (!instr)
788 return 1;
789
790 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
791 if (!outstr)
792 goto out1;
c0eb31ed
JK		 793
794 bh = udf_read_tagged(sb, block, block, &ident);
795 if (!bh)
ba9aadd8
MS		 796 goto out2;
797
c0eb31ed 798 BUG_ON(ident != TAG_IDENT_PVD);
1da177e4
LT		 799
800 pvoldesc = (struct primaryVolDesc *)bh->b_data;
801
56774805
MS		 802 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
803 pvoldesc->recordingDateAndTime)) {
af15a298 804#ifdef UDFFS_DEBUG
5ca4e4be 805 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
cbf5676a 806 udf_debug("recording time %04u/%02u/%02u"
3a71fc5d 807 " %02u:%02u (%x)\n",
af15a298
MS		 808 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
809 ts->minute, le16_to_cpu(ts->typeAndTimezone));
810#endif
1da177e4
LT		 811 }
812
ba9aadd8
MS		 813 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
814 if (udf_CS0toUTF8(outstr, instr)) {
815 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
816 outstr->u_len > 31 ? 31 : outstr->u_len);
4b11111a
MS		 817 udf_debug("volIdent[] = '%s'\n",
818 UDF_SB(sb)->s_volume_ident);
1da177e4 819 }
1da177e4 820
ba9aadd8
MS		 821 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
822 if (udf_CS0toUTF8(outstr, instr))
823 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
c0eb31ed
JK		 824
825 brelse(bh);
ba9aadd8
MS		 826 ret = 0;
827out2:
828 kfree(outstr);
829out1:
830 kfree(instr);
831 return ret;
1da177e4
LT		 832}
833
bfb257a5
JK		 834static int udf_load_metadata_files(struct super_block *sb, int partition)
835{
836 struct udf_sb_info *sbi = UDF_SB(sb);
837 struct udf_part_map *map;
838 struct udf_meta_data *mdata;
5ca4e4be 839 struct kernel_lb_addr addr;
bfb257a5
JK		 840 int fe_error = 0;
841
842 map = &sbi->s_partmaps[partition];
843 mdata = &map->s_type_specific.s_metadata;
844
845 /* metadata address */
846 addr.logicalBlockNum = mdata->s_meta_file_loc;
847 addr.partitionReferenceNum = map->s_partition_num;
848
849 udf_debug("Metadata file location: block = %d part = %d\n",
850 addr.logicalBlockNum, addr.partitionReferenceNum);
851
97e961fd 852 mdata->s_metadata_fe = udf_iget(sb, &addr);
bfb257a5
JK		 853
854 if (mdata->s_metadata_fe == NULL) {
855 udf_warning(sb, __func__, "metadata inode efe not found, "
856 "will try mirror inode.");
857 fe_error = 1;
858 } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
859 ICBTAG_FLAG_AD_SHORT) {
860 udf_warning(sb, __func__, "metadata inode efe does not have "
861 "short allocation descriptors!");
862 fe_error = 1;
863 iput(mdata->s_metadata_fe);
864 mdata->s_metadata_fe = NULL;
865 }
866
867 /* mirror file entry */
868 addr.logicalBlockNum = mdata->s_mirror_file_loc;
869 addr.partitionReferenceNum = map->s_partition_num;
870
871 udf_debug("Mirror metadata file location: block = %d part = %d\n",
872 addr.logicalBlockNum, addr.partitionReferenceNum);
873
97e961fd 874 mdata->s_mirror_fe = udf_iget(sb, &addr);
bfb257a5
JK		 875
876 if (mdata->s_mirror_fe == NULL) {
877 if (fe_error) {
878 udf_error(sb, __func__, "mirror inode efe not found "
879 "and metadata inode is missing too, exiting...");
880 goto error_exit;
881 } else
882 udf_warning(sb, __func__, "mirror inode efe not found,"
883 " but metadata inode is OK");
884 } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
885 ICBTAG_FLAG_AD_SHORT) {
886 udf_warning(sb, __func__, "mirror inode efe does not have "
887 "short allocation descriptors!");
888 iput(mdata->s_mirror_fe);
889 mdata->s_mirror_fe = NULL;
890 if (fe_error)
891 goto error_exit;
892 }
893
894 /*
895 * bitmap file entry
896 * Note:
897 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
898 */
899 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
900 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
901 addr.partitionReferenceNum = map->s_partition_num;
902
903 udf_debug("Bitmap file location: block = %d part = %d\n",
904 addr.logicalBlockNum, addr.partitionReferenceNum);
905
97e961fd 906 mdata->s_bitmap_fe = udf_iget(sb, &addr);
bfb257a5
JK		 907
908 if (mdata->s_bitmap_fe == NULL) {
909 if (sb->s_flags & MS_RDONLY)
910 udf_warning(sb, __func__, "bitmap inode efe "
911 "not found but it's ok since the disc"
912 " is mounted read-only");
913 else {
914 udf_error(sb, __func__, "bitmap inode efe not "
915 "found and attempted read-write mount");
916 goto error_exit;
917 }
918 }
919 }
920
921 udf_debug("udf_load_metadata_files Ok\n");
922
923 return 0;
924
925error_exit:
926 return 1;
927}
928
28de7948 929static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
5ca4e4be 930 struct kernel_lb_addr *root)
1da177e4
LT		 931{
932 struct fileSetDesc *fset;
933
934 fset = (struct fileSetDesc *)bh->b_data;
935
936 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
937
6c79e987 938 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 939
cb00ea35
CG		 940 udf_debug("Rootdir at block=%d, partition=%d\n",
941 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 942}
943
883cb9d1
MS		 944int udf_compute_nr_groups(struct super_block *sb, u32 partition)
945{
946 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 947 return DIV_ROUND_UP(map->s_partition_len +
948 (sizeof(struct spaceBitmapDesc) << 3),
949 sb->s_blocksize * 8);
883cb9d1
MS		 950}
951
66e1da3f
MS		 952static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
953{
66e1da3f
MS		 954 struct udf_bitmap *bitmap;
955 int nr_groups;
956 int size;
957
883cb9d1 958 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 959 size = sizeof(struct udf_bitmap) +
960 (sizeof(struct buffer_head *) * nr_groups);
961
962 if (size <= PAGE_SIZE)
963 bitmap = kmalloc(size, GFP_KERNEL);
964 else
965 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
966
967 if (bitmap == NULL) {
8e24eea7 968 udf_error(sb, __func__,
66e1da3f
MS		 969 "Unable to allocate space for bitmap "
970 "and %d buffer_head pointers", nr_groups);
971 return NULL;
972 }
973
974 memset(bitmap, 0x00, size);
975 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
976 bitmap->s_nr_groups = nr_groups;
977 return bitmap;
978}
979
3fb38dfa
JK		 980static int udf_fill_partdesc_info(struct super_block *sb,
981 struct partitionDesc *p, int p_index)
1da177e4 982{
6c79e987 983 struct udf_part_map *map;
165923fa 984 struct udf_sb_info *sbi = UDF_SB(sb);
3fb38dfa 985 struct partitionHeaderDesc *phd;
165923fa 986
3fb38dfa 987 map = &sbi->s_partmaps[p_index];
165923fa
MS		 988
989 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
990 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
991
992 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
993 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
994 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
995 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
996 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
997 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
998 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
999 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1000
706047a7
SM		 1001 udf_debug("Partition (%d type %x) starts at physical %d, "
1002 "block length %d\n", p_index,
165923fa
MS		 1003 map->s_partition_type, map->s_partition_root,
1004 map->s_partition_len);
1005
1006 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1007 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
3fb38dfa 1008 return 0;
165923fa
MS		 1009
1010 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1011 if (phd->unallocSpaceTable.extLength) {
5ca4e4be 1012 struct kernel_lb_addr loc = {
165923fa
MS		 1013 .logicalBlockNum = le32_to_cpu(
1014 phd->unallocSpaceTable.extPosition),
3fb38dfa 1015 .partitionReferenceNum = p_index,
165923fa
MS		 1016 };
1017
97e961fd 1018 map->s_uspace.s_table = udf_iget(sb, &loc);
165923fa
MS		 1019 if (!map->s_uspace.s_table) {
1020 udf_debug("cannot load unallocSpaceTable (part %d)\n",
3fb38dfa
JK		 1021 p_index);
1022 return 1;
165923fa
MS		 1023 }
1024 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1025 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
3fb38dfa 1026 p_index, map->s_uspace.s_table->i_ino);
165923fa
MS		 1027 }
1028
1029 if (phd->unallocSpaceBitmap.extLength) {
3fb38dfa
JK		 1030 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1031 if (!bitmap)
1032 return 1;
165923fa 1033 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1034 bitmap->s_extLength = le32_to_cpu(
165923fa 1035 phd->unallocSpaceBitmap.extLength);
2e0838fd 1036 bitmap->s_extPosition = le32_to_cpu(
165923fa 1037 phd->unallocSpaceBitmap.extPosition);
2e0838fd 1038 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
3fb38dfa 1039 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
2e0838fd 1040 bitmap->s_extPosition);
165923fa
MS		 1041 }
1042
1043 if (phd->partitionIntegrityTable.extLength)
3fb38dfa 1044 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
165923fa
MS		 1045
1046 if (phd->freedSpaceTable.extLength) {
5ca4e4be 1047 struct kernel_lb_addr loc = {
165923fa
MS		 1048 .logicalBlockNum = le32_to_cpu(
1049 phd->freedSpaceTable.extPosition),
3fb38dfa 1050 .partitionReferenceNum = p_index,
165923fa
MS		 1051 };
1052
97e961fd 1053 map->s_fspace.s_table = udf_iget(sb, &loc);
165923fa 1054 if (!map->s_fspace.s_table) {
3fb38dfa
JK		 1055 udf_debug("cannot load freedSpaceTable (part %d)\n",
1056 p_index);
1057 return 1;
165923fa
MS		 1058 }
1059
1060 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1061 udf_debug("freedSpaceTable (part %d) @ %ld\n",
3fb38dfa 1062 p_index, map->s_fspace.s_table->i_ino);
165923fa
MS		 1063 }
1064
1065 if (phd->freedSpaceBitmap.extLength) {
3fb38dfa
JK		 1066 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1067 if (!bitmap)
1068 return 1;
165923fa 1069 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1070 bitmap->s_extLength = le32_to_cpu(
165923fa 1071 phd->freedSpaceBitmap.extLength);
2e0838fd 1072 bitmap->s_extPosition = le32_to_cpu(
165923fa 1073 phd->freedSpaceBitmap.extPosition);
2e0838fd 1074 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
3fb38dfa 1075 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
2e0838fd 1076 bitmap->s_extPosition);
165923fa 1077 }
3fb38dfa
JK		 1078 return 0;
1079}
1080
38b74a53
JK		 1081static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1082{
1083 struct udf_sb_info *sbi = UDF_SB(sb);
1084 struct udf_part_map *map = &sbi->s_partmaps[p_index];
5ca4e4be 1085 struct kernel_lb_addr ino;
fa5e0815
JK		 1086 struct buffer_head *bh = NULL;
1087 struct udf_inode_info *vati;
1088 uint32_t pos;
1089 struct virtualAllocationTable20 *vat20;
38b74a53
JK		 1090
1091 /* VAT file entry is in the last recorded block */
1092 ino.partitionReferenceNum = type1_index;
1093 ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
97e961fd 1094 sbi->s_vat_inode = udf_iget(sb, &ino);
38b74a53
JK		 1095 if (!sbi->s_vat_inode)
1096 return 1;
1097
1098 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1099 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1100 map->s_type_specific.s_virtual.s_num_entries =
1101 (sbi->s_vat_inode->i_size - 36) >> 2;
1102 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1103 vati = UDF_I(sbi->s_vat_inode);
1104 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1105 pos = udf_block_map(sbi->s_vat_inode, 0);
1106 bh = sb_bread(sb, pos);
1107 if (!bh)
1108 return 1;
1109 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1110 } else {
1111 vat20 = (struct virtualAllocationTable20 *)
1112 vati->i_ext.i_data;
1113 }
38b74a53 1114
38b74a53 1115 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1116 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1117 map->s_type_specific.s_virtual.s_num_entries =
1118 (sbi->s_vat_inode->i_size -
1119 map->s_type_specific.s_virtual.
1120 s_start_offset) >> 2;
1121 brelse(bh);
1122 }
1123 return 0;
1124}
1125
3fb38dfa
JK		 1126static int udf_load_partdesc(struct super_block *sb, sector_t block)
1127{
1128 struct buffer_head *bh;
1129 struct partitionDesc *p;
1130 struct udf_part_map *map;
1131 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1132 int i, type1_idx;
3fb38dfa
JK		 1133 uint16_t partitionNumber;
1134 uint16_t ident;
1135 int ret = 0;
1136
1137 bh = udf_read_tagged(sb, block, block, &ident);
1138 if (!bh)
1139 return 1;
1140 if (ident != TAG_IDENT_PD)
1141 goto out_bh;
1142
1143 p = (struct partitionDesc *)bh->b_data;
1144 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1145
bfb257a5 1146 /* First scan for TYPE1, SPARABLE and METADATA partitions */
3fb38dfa
JK		 1147 for (i = 0; i < sbi->s_partitions; i++) {
1148 map = &sbi->s_partmaps[i];
1149 udf_debug("Searching map: (%d == %d)\n",
1150 map->s_partition_num, partitionNumber);
38b74a53
JK		 1151 if (map->s_partition_num == partitionNumber &&
1152 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1153 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1154 break;
1155 }
1156
38b74a53 1157 if (i >= sbi->s_partitions) {
3fb38dfa
JK		 1158 udf_debug("Partition (%d) not found in partition map\n",
1159 partitionNumber);
1160 goto out_bh;
1161 }
165923fa 1162
3fb38dfa 1163 ret = udf_fill_partdesc_info(sb, p, i);
38b74a53
JK		 1164
1165 /*
bfb257a5
JK		 1166 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1167 * PHYSICAL partitions are already set up
38b74a53
JK		 1168 */
1169 type1_idx = i;
1170 for (i = 0; i < sbi->s_partitions; i++) {
1171 map = &sbi->s_partmaps[i];
1172
1173 if (map->s_partition_num == partitionNumber &&
1174 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1175 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1176 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1177 break;
1178 }
1179
1180 if (i >= sbi->s_partitions)
1181 goto out_bh;
1182
1183 ret = udf_fill_partdesc_info(sb, p, i);
1184 if (ret)
1185 goto out_bh;
1186
bfb257a5
JK		 1187 if (map->s_partition_type == UDF_METADATA_MAP25) {
1188 ret = udf_load_metadata_files(sb, i);
1189 if (ret) {
1190 printk(KERN_ERR "UDF-fs: error loading MetaData "
1191 "partition map %d\n", i);
1192 goto out_bh;
1193 }
1194 } else {
1195 ret = udf_load_vat(sb, i, type1_idx);
1196 if (ret)
1197 goto out_bh;
1198 /*
1199 * Mark filesystem read-only if we have a partition with
1200 * virtual map since we don't handle writing to it (we
1201 * overwrite blocks instead of relocating them).
1202 */
1203 sb->s_flags |= MS_RDONLY;
1204 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1205 "because writing to pseudooverwrite partition is "
1206 "not implemented.\n");
1207 }
c0eb31ed 1208out_bh:
2e0838fd 1209 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1210 brelse(bh);
1211 return ret;
1da177e4
LT		 1212}
1213
c0eb31ed 1214static int udf_load_logicalvol(struct super_block *sb, sector_t block,
5ca4e4be 1215 struct kernel_lb_addr *fileset)
1da177e4
LT		 1216{
1217 struct logicalVolDesc *lvd;
1218 int i, j, offset;
1219 uint8_t type;
6c79e987 1220 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1221 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1222 uint16_t ident;
1223 struct buffer_head *bh;
1224 int ret = 0;
1da177e4 1225
c0eb31ed
JK		 1226 bh = udf_read_tagged(sb, block, block, &ident);
1227 if (!bh)
1228 return 1;
1229 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4
LT		 1230 lvd = (struct logicalVolDesc *)bh->b_data;
1231
dc5d39be 1232 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
c0eb31ed
JK		 1233 if (i != 0) {
1234 ret = i;
1235 goto out_bh;
1236 }
1da177e4 1237
cb00ea35 1238 for (i = 0, offset = 0;
6c79e987 1239 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
4b11111a
MS		 1240 i++, offset += gpm->partitionMapLength) {
1241 struct udf_part_map *map = &sbi->s_partmaps[i];
1242 gpm = (struct genericPartitionMap *)
1243 &(lvd->partitionMaps[offset]);
1244 type = gpm->partitionMapType;
cb00ea35 1245 if (type == 1) {
4b11111a
MS		 1246 struct genericPartitionMap1 *gpm1 =
1247 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1248 map->s_partition_type = UDF_TYPE1_MAP15;
1249 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1250 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1251 map->s_partition_func = NULL;
cb00ea35 1252 } else if (type == 2) {
4b11111a
MS		 1253 struct udfPartitionMap2 *upm2 =
1254 (struct udfPartitionMap2 *)gpm;
1255 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1256 strlen(UDF_ID_VIRTUAL))) {
1257 u16 suf =
1258 le16_to_cpu(((__le16 *)upm2->partIdent.
1259 identSuffix)[0]);
c82a1275 1260 if (suf < 0x0200) {
4b11111a
MS		 1261 map->s_partition_type =
1262 UDF_VIRTUAL_MAP15;
1263 map->s_partition_func =
1264 udf_get_pblock_virt15;
c82a1275 1265 } else {
4b11111a
MS		 1266 map->s_partition_type =
1267 UDF_VIRTUAL_MAP20;
1268 map->s_partition_func =
1269 udf_get_pblock_virt20;
1da177e4 1270 }
4b11111a
MS		 1271 } else if (!strncmp(upm2->partIdent.ident,
1272 UDF_ID_SPARABLE,
1273 strlen(UDF_ID_SPARABLE))) {
1da177e4 1274 uint32_t loc;
1da177e4 1275 struct sparingTable *st;
4b11111a
MS		 1276 struct sparablePartitionMap *spm =
1277 (struct sparablePartitionMap *)gpm;
28de7948 1278
6c79e987 1279 map->s_partition_type = UDF_SPARABLE_MAP15;
4b11111a
MS		 1280 map->s_type_specific.s_sparing.s_packet_len =
1281 le16_to_cpu(spm->packetLength);
cb00ea35 1282 for (j = 0; j < spm->numSparingTables; j++) {
4b11111a
MS		 1283 struct buffer_head *bh2;
1284
1285 loc = le32_to_cpu(
1286 spm->locSparingTable[j]);
1287 bh2 = udf_read_tagged(sb, loc, loc,
1288 &ident);
1289 map->s_type_specific.s_sparing.
1290 s_spar_map[j] = bh2;
1291
165923fa
MS		 1292 if (bh2 == NULL)
1293 continue;
1294
1295 st = (struct sparingTable *)bh2->b_data;
1296 if (ident != 0 || strncmp(
1297 st->sparingIdent.ident,
1298 UDF_ID_SPARING,
1299 strlen(UDF_ID_SPARING))) {
1300 brelse(bh2);
1301 map->s_type_specific.s_sparing.
1302 s_spar_map[j] = NULL;
1da177e4
LT		 1303 }
1304 }
6c79e987 1305 map->s_partition_func = udf_get_pblock_spar15;
bfb257a5
JK		 1306 } else if (!strncmp(upm2->partIdent.ident,
1307 UDF_ID_METADATA,
1308 strlen(UDF_ID_METADATA))) {
1309 struct udf_meta_data *mdata =
1310 &map->s_type_specific.s_metadata;
1311 struct metadataPartitionMap *mdm =
1312 (struct metadataPartitionMap *)
1313 &(lvd->partitionMaps[offset]);
1314 udf_debug("Parsing Logical vol part %d "
1315 "type %d id=%s\n", i, type,
1316 UDF_ID_METADATA);
1317
1318 map->s_partition_type = UDF_METADATA_MAP25;
1319 map->s_partition_func = udf_get_pblock_meta25;
1320
1321 mdata->s_meta_file_loc =
1322 le32_to_cpu(mdm->metadataFileLoc);
1323 mdata->s_mirror_file_loc =
1324 le32_to_cpu(mdm->metadataMirrorFileLoc);
1325 mdata->s_bitmap_file_loc =
1326 le32_to_cpu(mdm->metadataBitmapFileLoc);
1327 mdata->s_alloc_unit_size =
1328 le32_to_cpu(mdm->allocUnitSize);
1329 mdata->s_align_unit_size =
1330 le16_to_cpu(mdm->alignUnitSize);
1331 mdata->s_dup_md_flag =
1332 mdm->flags & 0x01;
1333
1334 udf_debug("Metadata Ident suffix=0x%x\n",
1335 (le16_to_cpu(
1336 ((__le16 *)
1337 mdm->partIdent.identSuffix)[0])));
1338 udf_debug("Metadata part num=%d\n",
1339 le16_to_cpu(mdm->partitionNum));
1340 udf_debug("Metadata part alloc unit size=%d\n",
1341 le32_to_cpu(mdm->allocUnitSize));
1342 udf_debug("Metadata file loc=%d\n",
1343 le32_to_cpu(mdm->metadataFileLoc));
1344 udf_debug("Mirror file loc=%d\n",
1345 le32_to_cpu(mdm->metadataMirrorFileLoc));
1346 udf_debug("Bitmap file loc=%d\n",
1347 le32_to_cpu(mdm->metadataBitmapFileLoc));
1348 udf_debug("Duplicate Flag: %d %d\n",
1349 mdata->s_dup_md_flag, mdm->flags);
cb00ea35 1350 } else {
3a71fc5d
MS		 1351 udf_debug("Unknown ident: %s\n",
1352 upm2->partIdent.ident);
1da177e4
LT		 1353 continue;
1354 }
6c79e987
MS		 1355 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1356 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4
LT		 1357 }
1358 udf_debug("Partition (%d:%d) type %d on volume %d\n",
6c79e987
MS		 1359 i, map->s_partition_num, type,
1360 map->s_volumeseqnum);
1da177e4
LT		 1361 }
1362
cb00ea35 1363 if (fileset) {
5ca4e4be 1364 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1365
1366 *fileset = lelb_to_cpu(la->extLocation);
3a71fc5d
MS		 1367 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1368 "partition=%d\n", fileset->logicalBlockNum,
28de7948 1369 fileset->partitionReferenceNum);
1da177e4
LT		 1370 }
1371 if (lvd->integritySeqExt.extLength)
1372 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
28de7948 1373
c0eb31ed
JK		 1374out_bh:
1375 brelse(bh);
1376 return ret;
1da177e4
LT		 1377}
1378
1379/*
1380 * udf_load_logicalvolint
1381 *
1382 */
5ca4e4be 1383static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1da177e4
LT		 1384{
1385 struct buffer_head *bh = NULL;
1386 uint16_t ident;
6c79e987
MS		 1387 struct udf_sb_info *sbi = UDF_SB(sb);
1388 struct logicalVolIntegrityDesc *lvid;
1da177e4
LT		 1389
1390 while (loc.extLength > 0 &&
cb00ea35
CG		 1391 (bh = udf_read_tagged(sb, loc.extLocation,
1392 loc.extLocation, &ident)) &&
1393 ident == TAG_IDENT_LVID) {
6c79e987
MS		 1394 sbi->s_lvid_bh = bh;
1395 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
cb00ea35 1396
6c79e987 1397 if (lvid->nextIntegrityExt.extLength)
3a71fc5d 1398 udf_load_logicalvolint(sb,
6c79e987 1399 leea_to_cpu(lvid->nextIntegrityExt));
cb00ea35 1400
6c79e987 1401 if (sbi->s_lvid_bh != bh)
3bf25cb4 1402 brelse(bh);
1da177e4 1403 loc.extLength -= sb->s_blocksize;
cb00ea35 1404 loc.extLocation++;
1da177e4 1405 }
6c79e987 1406 if (sbi->s_lvid_bh != bh)
3bf25cb4 1407 brelse(bh);
1da177e4
LT		 1408}
1409
1410/*
1411 * udf_process_sequence
1412 *
1413 * PURPOSE
1414 * Process a main/reserve volume descriptor sequence.
1415 *
1416 * PRE-CONDITIONS
1417 * sb Pointer to _locked_ superblock.
1418 * block First block of first extent of the sequence.
1419 * lastblock Lastblock of first extent of the sequence.
1420 *
1421 * HISTORY
1422 * July 1, 1997 - Andrew E. Mileski
1423 * Written, tested, and released.
1424 */
200a3592 1425static noinline int udf_process_sequence(struct super_block *sb, long block,
5ca4e4be 1426 long lastblock, struct kernel_lb_addr *fileset)
1da177e4
LT		 1427{
1428 struct buffer_head *bh = NULL;
1429 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1430 struct udf_vds_record *curr;
1da177e4
LT		 1431 struct generic_desc *gd;
1432 struct volDescPtr *vdp;
cb00ea35 1433 int done = 0;
1da177e4
LT		 1434 uint32_t vdsn;
1435 uint16_t ident;
1436 long next_s = 0, next_e = 0;
1437
1438 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1439
c0eb31ed
JK		 1440 /*
1441 * Read the main descriptor sequence and find which descriptors
1442 * are in it.
1443 */
cb00ea35 1444 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1445
1446 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed
JK		 1447 if (!bh) {
1448 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1449 "sequence is corrupted or we could not read "
1450 "it.\n", (unsigned long long)block);
1451 return 1;
1452 }
1da177e4
LT		 1453
1454 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1455 gd = (struct generic_desc *)bh->b_data;
1456 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1457 switch (ident) {
28de7948 1458 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1459 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1460 if (vdsn >= curr->volDescSeqNum) {
1461 curr->volDescSeqNum = vdsn;
1462 curr->block = block;
cb00ea35
CG		 1463 }
1464 break;
28de7948 1465 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
4b11111a
MS		 1466 curr = &vds[VDS_POS_VOL_DESC_PTR];
1467 if (vdsn >= curr->volDescSeqNum) {
1468 curr->volDescSeqNum = vdsn;
1469 curr->block = block;
cb00ea35
CG		 1470
1471 vdp = (struct volDescPtr *)bh->b_data;
4b11111a
MS		 1472 next_s = le32_to_cpu(
1473 vdp->nextVolDescSeqExt.extLocation);
1474 next_e = le32_to_cpu(
1475 vdp->nextVolDescSeqExt.extLength);
cb00ea35
CG		 1476 next_e = next_e >> sb->s_blocksize_bits;
1477 next_e += next_s;
1478 }
1479 break;
28de7948 1480 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1481 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1482 if (vdsn >= curr->volDescSeqNum) {
1483 curr->volDescSeqNum = vdsn;
1484 curr->block = block;
cb00ea35
CG		 1485 }
1486 break;
28de7948 1487 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1488 curr = &vds[VDS_POS_PARTITION_DESC];
1489 if (!curr->block)
1490 curr->block = block;
cb00ea35 1491 break;
28de7948 1492 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1493 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1494 if (vdsn >= curr->volDescSeqNum) {
1495 curr->volDescSeqNum = vdsn;
1496 curr->block = block;
cb00ea35
CG		 1497 }
1498 break;
28de7948 1499 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1500 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1501 if (vdsn >= curr->volDescSeqNum) {
1502 curr->volDescSeqNum = vdsn;
1503 curr->block = block;
cb00ea35
CG		 1504 }
1505 break;
28de7948 1506 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
cb00ea35
CG		 1507 vds[VDS_POS_TERMINATING_DESC].block = block;
1508 if (next_e) {
1509 block = next_s;
1510 lastblock = next_e;
1511 next_s = next_e = 0;
4b11111a 1512 } else
cb00ea35
CG		 1513 done = 1;
1514 break;
1da177e4 1515 }
3bf25cb4 1516 brelse(bh);
1da177e4 1517 }
c0eb31ed
JK		 1518 /*
1519 * Now read interesting descriptors again and process them
1520 * in a suitable order
1521 */
1522 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1523 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1524 return 1;
1525 }
1526 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1527 return 1;
165923fa 1528
c0eb31ed
JK		 1529 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1530 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1531 return 1;
165923fa 1532
c0eb31ed
JK		 1533 if (vds[VDS_POS_PARTITION_DESC].block) {
1534 /*
1535 * We rescan the whole descriptor sequence to find
1536 * partition descriptor blocks and process them.
1537 */
1538 for (block = vds[VDS_POS_PARTITION_DESC].block;
1539 block < vds[VDS_POS_TERMINATING_DESC].block;
1540 block++)
1541 if (udf_load_partdesc(sb, block))
165923fa 1542 return 1;
1da177e4
LT		 1543 }
1544
1545 return 0;
1546}
1547
40346005
JK		 1548static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1549 struct kernel_lb_addr *fileset)
1da177e4 1550{
40346005
JK		 1551 struct anchorVolDescPtr *anchor;
1552 long main_s, main_e, reserve_s, reserve_e;
1553 struct udf_sb_info *sbi;
1da177e4 1554
40346005
JK		 1555 sbi = UDF_SB(sb);
1556 anchor = (struct anchorVolDescPtr *)bh->b_data;
1557
1558 /* Locate the main sequence */
1559 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1560 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1561 main_e = main_e >> sb->s_blocksize_bits;
1562 main_e += main_s;
1563
1564 /* Locate the reserve sequence */
1565 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1566 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1567 reserve_e = reserve_e >> sb->s_blocksize_bits;
1568 reserve_e += reserve_s;
1569
1570 /* Process the main & reserve sequences */
1571 /* responsible for finding the PartitionDesc(s) */
1572 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1573 return 1;
1574 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1da177e4
LT		 1575}
1576
40346005
JK		 1577/*
1578 * Check whether there is an anchor block in the given block and
1579 * load Volume Descriptor Sequence if so.
1580 */
1581static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1582 struct kernel_lb_addr *fileset)
1197e4df 1583{
40346005
JK		 1584 struct buffer_head *bh;
1585 uint16_t ident;
1586 int ret;
1197e4df 1587
40346005
JK		 1588 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1589 udf_fixed_to_variable(block) >=
1590 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1197e4df 1591 return 0;
40346005
JK		 1592
1593 bh = udf_read_tagged(sb, block, block, &ident);
1594 if (!bh)
1197e4df 1595 return 0;
40346005
JK		 1596 if (ident != TAG_IDENT_AVDP) {
1597 brelse(bh);
1197e4df
CL		 1598 return 0;
1599 }
40346005
JK		 1600 ret = udf_load_sequence(sb, bh, fileset);
1601 brelse(bh);
1602 return ret;
1197e4df
CL		 1603}
1604
40346005
JK		 1605/* Search for an anchor volume descriptor pointer */
1606static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1607 struct kernel_lb_addr *fileset)
1da177e4 1608{
40346005 1609 sector_t last[6];
38b74a53 1610 int i;
40346005
JK		 1611 struct udf_sb_info *sbi = UDF_SB(sb);
1612 int last_count = 0;
1da177e4 1613
40346005
JK		 1614 /* First try user provided anchor */
1615 if (sbi->s_anchor) {
1616 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1617 return lastblock;
1618 }
1619 /*
1620 * according to spec, anchor is in either:
1621 * block 256
1622 * lastblock-256
1623 * lastblock
1624 * however, if the disc isn't closed, it could be 512.
1625 */
1626 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1627 return lastblock;
1628 /*
1629 * The trouble is which block is the last one. Drives often misreport
1630 * this so we try various possibilities.
1631 */
1632 last[last_count++] = lastblock;
1633 if (lastblock >= 1)
1634 last[last_count++] = lastblock - 1;
1635 last[last_count++] = lastblock + 1;
1636 if (lastblock >= 2)
1637 last[last_count++] = lastblock - 2;
1638 if (lastblock >= 150)
1639 last[last_count++] = lastblock - 150;
1640 if (lastblock >= 152)
1641 last[last_count++] = lastblock - 152;
1da177e4 1642
40346005
JK		 1643 for (i = 0; i < last_count; i++) {
1644 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1645 sb->s_blocksize_bits)
28f7c4d4 1646 continue;
40346005
JK		 1647 if (udf_check_anchor_block(sb, last[i], fileset))
1648 return last[i];
1649 if (last[i] < 256)
28f7c4d4 1650 continue;
40346005
JK		 1651 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1652 return last[i];
1653 }
28f7c4d4 1654
40346005
JK		 1655 /* Finally try block 512 in case media is open */
1656 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1657 return last[0];
1658 return 0;
1659}
28f7c4d4 1660
40346005
JK		 1661/*
1662 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1663 * area specified by it. The function expects sbi->s_lastblock to be the last
1664 * block on the media.
1665 *
1666 * Return 1 if ok, 0 if not found.
1667 *
1668 */
1669static int udf_find_anchor(struct super_block *sb,
1670 struct kernel_lb_addr *fileset)
1671{
1672 sector_t lastblock;
1673 struct udf_sb_info *sbi = UDF_SB(sb);
28f7c4d4 1674
40346005
JK		 1675 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1676 if (lastblock)
1677 goto out;
1da177e4 1678
40346005
JK		 1679 /* No anchor found? Try VARCONV conversion of block numbers */
1680 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1681 /* Firstly, we try to not convert number of the last block */
1682 lastblock = udf_scan_anchors(sb,
1683 udf_variable_to_fixed(sbi->s_last_block),
1684 fileset);
1685 if (lastblock)
1686 goto out;
1da177e4 1687
40346005
JK		 1688 /* Secondly, we try with converted number of the last block */
1689 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1690 if (!lastblock) {
1691 /* VARCONV didn't help. Clear it. */
1692 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1693 return 0;
1da177e4 1694 }
40346005
JK		 1695out:
1696 sbi->s_last_block = lastblock;
1697 return 1;
1698}
1da177e4 1699
40346005
JK		 1700/*
1701 * Check Volume Structure Descriptor, find Anchor block and load Volume
1702 * Descriptor Sequence
1703 */
1704static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1705 int silent, struct kernel_lb_addr *fileset)
1706{
1707 struct udf_sb_info *sbi = UDF_SB(sb);
1708 loff_t nsr_off;
1709
1710 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1711 if (!silent)
1712 printk(KERN_WARNING "UDF-fs: Bad block size\n");
1713 return 0;
1714 }
1715 sbi->s_last_block = uopt->lastblock;
1716 if (!uopt->novrs) {
1717 /* Check that it is NSR02 compliant */
1718 nsr_off = udf_check_vsd(sb);
1719 if (!nsr_off) {
1720 if (!silent)
1721 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1722 return 0;
1723 }
1724 if (nsr_off == -1)
1725 udf_debug("Failed to read byte 32768. Assuming open "
1726 "disc. Skipping validity check\n");
1727 if (!sbi->s_last_block)
1728 sbi->s_last_block = udf_get_last_block(sb);
1729 } else {
1730 udf_debug("Validity check skipped because of novrs option\n");
28f7c4d4 1731 }
1da177e4 1732
40346005
JK		 1733 /* Look for anchor block and load Volume Descriptor Sequence */
1734 sbi->s_anchor = uopt->anchor;
1735 if (!udf_find_anchor(sb, fileset)) {
1736 if (!silent)
1737 printk(KERN_WARNING "UDF-fs: No anchor found\n");
1738 return 0;
1739 }
1740 return 1;
1da177e4
LT		 1741}
1742
1743static void udf_open_lvid(struct super_block *sb)
1744{
6c79e987
MS		 1745 struct udf_sb_info *sbi = UDF_SB(sb);
1746 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1747 struct logicalVolIntegrityDesc *lvid;
1748 struct logicalVolIntegrityDescImpUse *lvidiu;
146bca72 1749
165923fa
MS		 1750 if (!bh)
1751 return;
165923fa
MS		 1752 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1753 lvidiu = udf_sb_lvidiu(sbi);
1754
1755 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1756 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1757 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1758 CURRENT_TIME);
146bca72 1759 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
165923fa
MS		 1760
1761 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1762 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1763 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1764
1765 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1766 mark_buffer_dirty(bh);
146bca72 1767 sbi->s_lvid_dirty = 0;
1da177e4
LT		 1768}
1769
1770static void udf_close_lvid(struct super_block *sb)
1771{
6c79e987
MS		 1772 struct udf_sb_info *sbi = UDF_SB(sb);
1773 struct buffer_head *bh = sbi->s_lvid_bh;
1774 struct logicalVolIntegrityDesc *lvid;
165923fa 1775 struct logicalVolIntegrityDescImpUse *lvidiu;
28de7948 1776
6c79e987
MS		 1777 if (!bh)
1778 return;
1779
1780 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
165923fa
MS		 1781 lvidiu = udf_sb_lvidiu(sbi);
1782 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1783 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1784 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1785 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1786 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1787 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1788 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1789 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1790 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1791 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1792
1793 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1794 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1795 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1796
1797 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1798 mark_buffer_dirty(bh);
146bca72 1799 sbi->s_lvid_dirty = 0;
1da177e4
LT		 1800}
1801
66e1da3f
MS		 1802static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1803{
1804 int i;
1805 int nr_groups = bitmap->s_nr_groups;
4b11111a
MS		 1806 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1807 nr_groups);
66e1da3f
MS		 1808
1809 for (i = 0; i < nr_groups; i++)
1810 if (bitmap->s_block_bitmap[i])
1811 brelse(bitmap->s_block_bitmap[i]);
1812
1813 if (size <= PAGE_SIZE)
1814 kfree(bitmap);
1815 else
1816 vfree(bitmap);
1817}
1818
2e0838fd
JK		 1819static void udf_free_partition(struct udf_part_map *map)
1820{
1821 int i;
bfb257a5 1822 struct udf_meta_data *mdata;
2e0838fd
JK		 1823
1824 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1825 iput(map->s_uspace.s_table);
1826 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1827 iput(map->s_fspace.s_table);
1828 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1829 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1830 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1831 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1832 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1833 for (i = 0; i < 4; i++)
1834 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
bfb257a5
JK		 1835 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1836 mdata = &map->s_type_specific.s_metadata;
1837 iput(mdata->s_metadata_fe);
1838 mdata->s_metadata_fe = NULL;
1839
1840 iput(mdata->s_mirror_fe);
1841 mdata->s_mirror_fe = NULL;
1842
1843 iput(mdata->s_bitmap_fe);
1844 mdata->s_bitmap_fe = NULL;
1845 }
2e0838fd
JK		 1846}
1847
1da177e4
LT		 1848static int udf_fill_super(struct super_block *sb, void *options, int silent)
1849{
1850 int i;
40346005 1851 int ret;
cb00ea35 1852 struct inode *inode = NULL;
1da177e4 1853 struct udf_options uopt;
5ca4e4be 1854 struct kernel_lb_addr rootdir, fileset;
1da177e4
LT		 1855 struct udf_sb_info *sbi;
1856
1857 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1858 uopt.uid = -1;
1859 uopt.gid = -1;
1860 uopt.umask = 0;
87bc730c
MS		 1861 uopt.fmode = UDF_INVALID_MODE;
1862 uopt.dmode = UDF_INVALID_MODE;
1da177e4 1863
6c79e987 1864 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1da177e4
LT		 1865 if (!sbi)
1866 return -ENOMEM;
28de7948 1867
1da177e4 1868 sb->s_fs_info = sbi;
1da177e4 1869
1e7933de 1870 mutex_init(&sbi->s_alloc_mutex);
1da177e4 1871
6da80894 1872 if (!udf_parse_options((char *)options, &uopt, false))
1da177e4
LT		 1873 goto error_out;
1874
1875 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 1876 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1da177e4 1877 udf_error(sb, "udf_read_super",
cb00ea35 1878 "utf8 cannot be combined with iocharset\n");
1da177e4
LT		 1879 goto error_out;
1880 }
1881#ifdef CONFIG_UDF_NLS
cb00ea35 1882 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 1883 uopt.nls_map = load_nls_default();
1884 if (!uopt.nls_map)
1885 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1886 else
1887 udf_debug("Using default NLS map\n");
1888 }
1889#endif
1890 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1891 uopt.flags |= (1 << UDF_FLAG_UTF8);
1892
1893 fileset.logicalBlockNum = 0xFFFFFFFF;
1894 fileset.partitionReferenceNum = 0xFFFF;
1895
6c79e987
MS		 1896 sbi->s_flags = uopt.flags;
1897 sbi->s_uid = uopt.uid;
1898 sbi->s_gid = uopt.gid;
1899 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 1900 sbi->s_fmode = uopt.fmode;
1901 sbi->s_dmode = uopt.dmode;
6c79e987 1902 sbi->s_nls_map = uopt.nls_map;
1da177e4 1903
cb00ea35 1904 if (uopt.session == 0xFFFFFFFF)
6c79e987 1905 sbi->s_session = udf_get_last_session(sb);
1da177e4 1906 else
6c79e987 1907 sbi->s_session = uopt.session;
1da177e4 1908
6c79e987 1909 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 1910
40346005
JK		 1911 /* Fill in the rest of the superblock */
1912 sb->s_op = &udf_sb_ops;
1913 sb->s_export_op = &udf_export_ops;
1914 sb->dq_op = NULL;
1915 sb->s_dirt = 0;
1916 sb->s_magic = UDF_SUPER_MAGIC;
1917 sb->s_time_gran = 1000;
1918
1197e4df 1919 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
40346005 1920 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 1921 } else {
e1defc4f 1922 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
40346005
JK		 1923 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1924 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1197e4df
CL		 1925 if (!silent)
1926 printk(KERN_NOTICE
1927 "UDF-fs: Rescanning with blocksize "
1928 "%d\n", UDF_DEFAULT_BLOCKSIZE);
1929 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
40346005 1930 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 1931 }
1da177e4 1932 }
40346005 1933 if (!ret) {
3a71fc5d 1934 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1da177e4
LT		 1935 goto error_out;
1936 }
1937
6c79e987 1938 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1da177e4 1939
6c79e987 1940 if (sbi->s_lvid_bh) {
4b11111a
MS		 1941 struct logicalVolIntegrityDescImpUse *lvidiu =
1942 udf_sb_lvidiu(sbi);
6c79e987
MS		 1943 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1944 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
4b11111a
MS		 1945 /* uint16_t maxUDFWriteRev =
1946 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1da177e4 1947
cb00ea35 1948 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
4b11111a
MS		 1949 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1950 "(max is %x)\n",
6c79e987 1951 le16_to_cpu(lvidiu->minUDFReadRev),
cb00ea35 1952 UDF_MAX_READ_VERSION);
1da177e4 1953 goto error_out;
4b11111a 1954 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1da177e4 1955 sb->s_flags |= MS_RDONLY;
1da177e4 1956
6c79e987 1957 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 1958
1959 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1960 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1961 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1962 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1963 }
1964
6c79e987 1965 if (!sbi->s_partitions) {
3a71fc5d 1966 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1da177e4
LT		 1967 goto error_out;
1968 }
1969
4b11111a
MS		 1970 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1971 UDF_PART_FLAG_READ_ONLY) {
1972 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1973 "forcing readonly mount\n");
39b3f6d6 1974 sb->s_flags |= MS_RDONLY;
c1a26e7d 1975 }
39b3f6d6 1976
cb00ea35 1977 if (udf_find_fileset(sb, &fileset, &rootdir)) {
3a71fc5d 1978 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1da177e4
LT		 1979 goto error_out;
1980 }
1981
cb00ea35 1982 if (!silent) {
5ca4e4be 1983 struct timestamp ts;
56774805 1984 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
a9ca6635 1985 udf_info("UDF: Mounting volume '%s', "
28de7948 1986 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
56774805
MS		 1987 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1988 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4
LT		 1989 }
1990 if (!(sb->s_flags & MS_RDONLY))
1991 udf_open_lvid(sb);
1992
1993 /* Assign the root inode */
1994 /* assign inodes by physical block number */
1995 /* perhaps it's not extensible enough, but for now ... */
97e961fd 1996 inode = udf_iget(sb, &rootdir);
cb00ea35 1997 if (!inode) {
4b11111a
MS		 1998 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1999 "partition=%d\n",
cb00ea35 2000 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1da177e4
LT		 2001 goto error_out;
2002 }
2003
2004 /* Allocate a dentry for the root inode */
2005 sb->s_root = d_alloc_root(inode);
cb00ea35 2006 if (!sb->s_root) {
3a71fc5d 2007 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1da177e4
LT		 2008 iput(inode);
2009 goto error_out;
2010 }
31170b6a 2011 sb->s_maxbytes = MAX_LFS_FILESIZE;
1da177e4
LT		 2012 return 0;
2013
28de7948 2014error_out:
6c79e987
MS		 2015 if (sbi->s_vat_inode)
2016 iput(sbi->s_vat_inode);
2e0838fd
JK		 2017 if (sbi->s_partitions)
2018 for (i = 0; i < sbi->s_partitions; i++)
2019 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2020#ifdef CONFIG_UDF_NLS
2021 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2022 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2023#endif
2024 if (!(sb->s_flags & MS_RDONLY))
2025 udf_close_lvid(sb);
6c79e987
MS		 2026 brelse(sbi->s_lvid_bh);
2027
2028 kfree(sbi->s_partmaps);
1da177e4
LT		 2029 kfree(sbi);
2030 sb->s_fs_info = NULL;
28de7948 2031
1da177e4
LT		 2032 return -EINVAL;
2033}
2034
b8145a76
AB		 2035static void udf_error(struct super_block *sb, const char *function,
2036 const char *fmt, ...)
1da177e4
LT		 2037{
2038 va_list args;
2039
cb00ea35 2040 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 2041 /* mark sb error */
2042 sb->s_dirt = 1;
2043 }
2044 va_start(args, fmt);
4a6e617a 2045 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 2046 va_end(args);
3a71fc5d 2047 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
28de7948 2048 sb->s_id, function, error_buf);
1da177e4
LT		 2049}
2050
2051void udf_warning(struct super_block *sb, const char *function,
cb00ea35 2052 const char *fmt, ...)
1da177e4
LT		 2053{
2054 va_list args;
2055
cb00ea35 2056 va_start(args, fmt);
4a6e617a 2057 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4
LT		 2058 va_end(args);
2059 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
cb00ea35 2060 sb->s_id, function, error_buf);
1da177e4
LT		 2061}
2062
cb00ea35 2063static void udf_put_super(struct super_block *sb)
1da177e4
LT		 2064{
2065 int i;
6c79e987 2066 struct udf_sb_info *sbi;
1da177e4 2067
6c79e987 2068 sbi = UDF_SB(sb);
6cfd0148
CH		 2069
2070 lock_kernel();
2071
6c79e987
MS		 2072 if (sbi->s_vat_inode)
2073 iput(sbi->s_vat_inode);
2e0838fd
JK		 2074 if (sbi->s_partitions)
2075 for (i = 0; i < sbi->s_partitions; i++)
2076 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2077#ifdef CONFIG_UDF_NLS
2078 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2079 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2080#endif
2081 if (!(sb->s_flags & MS_RDONLY))
2082 udf_close_lvid(sb);
6c79e987
MS		 2083 brelse(sbi->s_lvid_bh);
2084 kfree(sbi->s_partmaps);
1da177e4
LT		 2085 kfree(sb->s_fs_info);
2086 sb->s_fs_info = NULL;
6cfd0148
CH		 2087
2088 unlock_kernel();
1da177e4
LT		 2089}
2090
146bca72
JK		 2091static int udf_sync_fs(struct super_block *sb, int wait)
2092{
2093 struct udf_sb_info *sbi = UDF_SB(sb);
2094
2095 mutex_lock(&sbi->s_alloc_mutex);
2096 if (sbi->s_lvid_dirty) {
2097 /*
2098 * Blockdevice will be synced later so we don't have to submit
2099 * the buffer for IO
2100 */
2101 mark_buffer_dirty(sbi->s_lvid_bh);
2102 sb->s_dirt = 0;
2103 sbi->s_lvid_dirty = 0;
2104 }
2105 mutex_unlock(&sbi->s_alloc_mutex);
2106
2107 return 0;
2108}
2109
cb00ea35 2110static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 2111{
726c3342 2112 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 2113 struct udf_sb_info *sbi = UDF_SB(sb);
2114 struct logicalVolIntegrityDescImpUse *lvidiu;
557f5a14 2115 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
6c79e987
MS		 2116
2117 if (sbi->s_lvid_bh != NULL)
2118 lvidiu = udf_sb_lvidiu(sbi);
2119 else
2120 lvidiu = NULL;
726c3342 2121
1da177e4
LT		 2122 buf->f_type = UDF_SUPER_MAGIC;
2123 buf->f_bsize = sb->s_blocksize;
6c79e987 2124 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 2125 buf->f_bfree = udf_count_free(sb);
2126 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 2127 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2128 le32_to_cpu(lvidiu->numDirs)) : 0)
2129 + buf->f_bfree;
1da177e4 2130 buf->f_ffree = buf->f_bfree;
cb00ea35 2131 buf->f_namelen = UDF_NAME_LEN - 2;
557f5a14
CL		 2132 buf->f_fsid.val[0] = (u32)id;
2133 buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4
LT		 2134
2135 return 0;
2136}
2137
4b11111a
MS		 2138static unsigned int udf_count_free_bitmap(struct super_block *sb,
2139 struct udf_bitmap *bitmap)
1da177e4
LT		 2140{
2141 struct buffer_head *bh = NULL;
2142 unsigned int accum = 0;
2143 int index;
2144 int block = 0, newblock;
5ca4e4be 2145 struct kernel_lb_addr loc;
1da177e4 2146 uint32_t bytes;
1da177e4
LT		 2147 uint8_t *ptr;
2148 uint16_t ident;
2149 struct spaceBitmapDesc *bm;
2150
2151 lock_kernel();
2152
2153 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 2154 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
97e961fd 2155 bh = udf_read_ptagged(sb, &loc, 0, &ident);
1da177e4 2156
cb00ea35 2157 if (!bh) {
1da177e4
LT		 2158 printk(KERN_ERR "udf: udf_count_free failed\n");
2159 goto out;
cb00ea35 2160 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 2161 brelse(bh);
1da177e4
LT		 2162 printk(KERN_ERR "udf: udf_count_free failed\n");
2163 goto out;
2164 }
2165
2166 bm = (struct spaceBitmapDesc *)bh->b_data;
2167 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 2168 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2169 ptr = (uint8_t *)bh->b_data;
1da177e4 2170
cb00ea35 2171 while (bytes > 0) {
01b954a3
MS		 2172 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2173 accum += bitmap_weight((const unsigned long *)(ptr + index),
2174 cur_bytes * 8);
2175 bytes -= cur_bytes;
cb00ea35 2176 if (bytes) {
3bf25cb4 2177 brelse(bh);
97e961fd 2178 newblock = udf_get_lb_pblock(sb, &loc, ++block);
1da177e4 2179 bh = udf_tread(sb, newblock);
cb00ea35 2180 if (!bh) {
1da177e4
LT		 2181 udf_debug("read failed\n");
2182 goto out;
2183 }
2184 index = 0;
28de7948 2185 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2186 }
2187 }
3bf25cb4 2188 brelse(bh);
1da177e4 2189
28de7948 2190out:
1da177e4
LT		 2191 unlock_kernel();
2192
2193 return accum;
2194}
2195
4b11111a
MS		 2196static unsigned int udf_count_free_table(struct super_block *sb,
2197 struct inode *table)
1da177e4
LT		 2198{
2199 unsigned int accum = 0;
ff116fc8 2200 uint32_t elen;
5ca4e4be 2201 struct kernel_lb_addr eloc;
1da177e4 2202 int8_t etype;
ff116fc8 2203 struct extent_position epos;
1da177e4
LT		 2204
2205 lock_kernel();
2206
c0b34438 2207 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2208 epos.offset = sizeof(struct unallocSpaceEntry);
2209 epos.bh = NULL;
1da177e4 2210
3a71fc5d 2211 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2212 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2213
3bf25cb4 2214 brelse(epos.bh);
1da177e4
LT		 2215
2216 unlock_kernel();
2217
2218 return accum;
2219}
cb00ea35
CG		 2220
2221static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2222{
2223 unsigned int accum = 0;
6c79e987
MS		 2224 struct udf_sb_info *sbi;
2225 struct udf_part_map *map;
1da177e4 2226
6c79e987
MS		 2227 sbi = UDF_SB(sb);
2228 if (sbi->s_lvid_bh) {
4b11111a
MS		 2229 struct logicalVolIntegrityDesc *lvid =
2230 (struct logicalVolIntegrityDesc *)
2231 sbi->s_lvid_bh->b_data;
6c79e987 2232 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2233 accum = le32_to_cpu(
2234 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2235 if (accum == 0xFFFFFFFF)
2236 accum = 0;
2237 }
2238 }
2239
2240 if (accum)
2241 return accum;
2242
6c79e987
MS		 2243 map = &sbi->s_partmaps[sbi->s_partition];
2244 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2245 accum += udf_count_free_bitmap(sb,
6c79e987 2246 map->s_uspace.s_bitmap);
1da177e4 2247 }
6c79e987 2248 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2249 accum += udf_count_free_bitmap(sb,
6c79e987 2250 map->s_fspace.s_bitmap);
1da177e4
LT		 2251 }
2252 if (accum)
2253 return accum;
2254
6c79e987 2255 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2256 accum += udf_count_free_table(sb,
6c79e987 2257 map->s_uspace.s_table);
1da177e4 2258 }
6c79e987 2259 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2260 accum += udf_count_free_table(sb,
6c79e987 2261 map->s_fspace.s_table);
1da177e4
LT		 2262 }
2263
2264 return accum;
2265}
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