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Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.
[linux-2.6-block.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>
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 *);
84static void udf_write_super(struct super_block *);
85static int udf_remount_fs(struct super_block *, int *, char *);
86static int udf_check_valid(struct super_block *, int, int);
87static int udf_vrs(struct super_block *sb, int silent);
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) {
8e24eea7 243 udf_error(sb, __func__,
dc5d39be
MS		 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;
f4bcbbd9 591 loff_t sector = 32768;
1da177e4
LT		 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",
706047a7
SM		 612 (unsigned int)(sector >> sb->s_blocksize_bits),
613 sb->s_blocksize);
1da177e4 614 /* Process the sequence (if applicable) */
cb00ea35 615 for (; !nsr02 && !nsr03; sector += sectorsize) {
1da177e4
LT		 616 /* Read a block */
617 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
618 if (!bh)
619 break;
620
621 /* Look for ISO descriptors */
622 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 623 (sector & (sb->s_blocksize - 1)));
1da177e4 624
cb00ea35 625 if (vsd->stdIdent[0] == 0) {
3bf25cb4 626 brelse(bh);
1da177e4 627 break;
3a71fc5d
MS		 628 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
629 VSD_STD_ID_LEN)) {
1da177e4 630 iso9660 = sector;
cb00ea35
CG		 631 switch (vsd->structType) {
632 case 0:
633 udf_debug("ISO9660 Boot Record found\n");
634 break;
635 case 1:
3a71fc5d
MS		 636 udf_debug("ISO9660 Primary Volume Descriptor "
637 "found\n");
cb00ea35
CG		 638 break;
639 case 2:
3a71fc5d
MS		 640 udf_debug("ISO9660 Supplementary Volume "
641 "Descriptor found\n");
cb00ea35
CG		 642 break;
643 case 3:
3a71fc5d
MS		 644 udf_debug("ISO9660 Volume Partition Descriptor "
645 "found\n");
cb00ea35
CG		 646 break;
647 case 255:
3a71fc5d
MS		 648 udf_debug("ISO9660 Volume Descriptor Set "
649 "Terminator found\n");
cb00ea35
CG		 650 break;
651 default:
652 udf_debug("ISO9660 VRS (%u) found\n",
653 vsd->structType);
654 break;
1da177e4 655 }
3a71fc5d
MS		 656 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
657 VSD_STD_ID_LEN))
658 ; /* nothing */
659 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
660 VSD_STD_ID_LEN)) {
3bf25cb4 661 brelse(bh);
1da177e4 662 break;
3a71fc5d
MS		 663 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
664 VSD_STD_ID_LEN))
1da177e4 665 nsr02 = sector;
3a71fc5d
MS		 666 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
667 VSD_STD_ID_LEN))
1da177e4 668 nsr03 = sector;
3bf25cb4 669 brelse(bh);
1da177e4
LT		 670 }
671
672 if (nsr03)
673 return nsr03;
674 else if (nsr02)
675 return nsr02;
6c79e987 676 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
1da177e4
LT		 677 return -1;
678 else
679 return 0;
680}
681
682/*
423cf6dc 683 * Check whether there is an anchor block in the given block
1da177e4 684 */
e8183c24 685static int udf_check_anchor_block(struct super_block *sb, sector_t block)
1da177e4 686{
e8183c24 687 struct buffer_head *bh;
1da177e4 688 uint16_t ident;
423cf6dc 689
e8183c24
TJ		 690 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
691 udf_fixed_to_variable(block) >=
692 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
693 return 0;
423cf6dc 694
e8183c24 695 bh = udf_read_tagged(sb, block, block, &ident);
423cf6dc
JK		 696 if (!bh)
697 return 0;
423cf6dc 698 brelse(bh);
e8183c24
TJ		 699
700 return ident == TAG_IDENT_AVDP;
423cf6dc
JK		 701}
702
703/* Search for an anchor volume descriptor pointer */
e8183c24 704static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
423cf6dc 705{
5fb28aa2 706 sector_t last[6];
1da177e4 707 int i;
423cf6dc 708 struct udf_sb_info *sbi = UDF_SB(sb);
6c79e987 709
423cf6dc 710 last[0] = lastblock;
5fb28aa2
JK		 711 last[1] = last[0] - 1;
712 last[2] = last[0] + 1;
713 last[3] = last[0] - 2;
714 last[4] = last[0] - 150;
715 last[5] = last[0] - 152;
1da177e4 716
423cf6dc
JK		 717 /* according to spec, anchor is in either:
718 * block 256
719 * lastblock-256
720 * lastblock
721 * however, if the disc isn't closed, it could be 512 */
e8c96f8c 722
423cf6dc
JK		 723 for (i = 0; i < ARRAY_SIZE(last); i++) {
724 if (last[i] < 0)
725 continue;
5fb28aa2
JK		 726 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
727 sb->s_blocksize_bits)
728 continue;
cb00ea35 729
e8183c24 730 if (udf_check_anchor_block(sb, last[i])) {
423cf6dc
JK		 731 sbi->s_anchor[0] = last[i];
732 sbi->s_anchor[1] = last[i] - 256;
733 return last[i];
734 }
cb00ea35 735
423cf6dc
JK		 736 if (last[i] < 256)
737 continue;
738
e8183c24 739 if (udf_check_anchor_block(sb, last[i] - 256)) {
423cf6dc
JK		 740 sbi->s_anchor[1] = last[i] - 256;
741 return last[i];
1da177e4
LT		 742 }
743 }
744
e8183c24 745 if (udf_check_anchor_block(sb, sbi->s_session + 256)) {
423cf6dc
JK		 746 sbi->s_anchor[0] = sbi->s_session + 256;
747 return last[0];
748 }
e8183c24 749 if (udf_check_anchor_block(sb, sbi->s_session + 512)) {
423cf6dc
JK		 750 sbi->s_anchor[0] = sbi->s_session + 512;
751 return last[0];
752 }
753 return 0;
754}
1da177e4 755
423cf6dc
JK		 756/*
757 * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
758 * be the last block on the media.
759 *
760 * Return 1 if not found, 0 if ok
761 *
762 */
763static void udf_find_anchor(struct super_block *sb)
764{
765 sector_t lastblock;
766 struct buffer_head *bh = NULL;
767 uint16_t ident;
768 int i;
769 struct udf_sb_info *sbi = UDF_SB(sb);
770
e8183c24 771 lastblock = udf_scan_anchors(sb, sbi->s_last_block);
423cf6dc
JK		 772 if (lastblock)
773 goto check_anchor;
774
775 /* No anchor found? Try VARCONV conversion of block numbers */
e8183c24 776 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
423cf6dc 777 /* Firstly, we try to not convert number of the last block */
e8183c24 778 lastblock = udf_scan_anchors(sb,
423cf6dc 779 udf_variable_to_fixed(sbi->s_last_block));
e8183c24 780 if (lastblock)
423cf6dc 781 goto check_anchor;
1da177e4 782
423cf6dc 783 /* Secondly, we try with converted number of the last block */
e8183c24
TJ		 784 lastblock = udf_scan_anchors(sb, sbi->s_last_block);
785 if (!lastblock) {
786 /* VARCONV didn't help. Clear it. */
787 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
788 }
423cf6dc
JK		 789
790check_anchor:
791 /*
792 * Check located anchors and the anchor block supplied via
793 * mount options
794 */
6c79e987 795 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
165923fa
MS		 796 if (!sbi->s_anchor[i])
797 continue;
798 bh = udf_read_tagged(sb, sbi->s_anchor[i],
799 sbi->s_anchor[i], &ident);
800 if (!bh)
801 sbi->s_anchor[i] = 0;
802 else {
803 brelse(bh);
423cf6dc 804 if (ident != TAG_IDENT_AVDP)
6c79e987 805 sbi->s_anchor[i] = 0;
1da177e4
LT		 806 }
807 }
808
6c79e987 809 sbi->s_last_block = lastblock;
1da177e4
LT		 810}
811
3a71fc5d
MS		 812static int udf_find_fileset(struct super_block *sb,
813 kernel_lb_addr *fileset,
814 kernel_lb_addr *root)
1da177e4
LT		 815{
816 struct buffer_head *bh = NULL;
817 long lastblock;
818 uint16_t ident;
6c79e987 819 struct udf_sb_info *sbi;
1da177e4
LT		 820
821 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 822 fileset->partitionReferenceNum != 0xFFFF) {
1da177e4
LT		 823 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
824
28de7948 825 if (!bh) {
1da177e4 826 return 1;
28de7948 827 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 828 brelse(bh);
1da177e4
LT		 829 return 1;
830 }
cb00ea35 831
1da177e4
LT		 832 }
833
6c79e987 834 sbi = UDF_SB(sb);
3a71fc5d
MS		 835 if (!bh) {
836 /* Search backwards through the partitions */
1da177e4
LT		 837 kernel_lb_addr newfileset;
838
28de7948 839/* --> cvg: FIXME - is it reasonable? */
1da177e4 840 return 1;
cb00ea35 841
6c79e987 842 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 843 (newfileset.partitionReferenceNum != 0xFFFF &&
844 fileset->logicalBlockNum == 0xFFFFFFFF &&
845 fileset->partitionReferenceNum == 0xFFFF);
846 newfileset.partitionReferenceNum--) {
6c79e987
MS		 847 lastblock = sbi->s_partmaps
848 [newfileset.partitionReferenceNum]
849 .s_partition_len;
1da177e4
LT		 850 newfileset.logicalBlockNum = 0;
851
cb00ea35 852 do {
3a71fc5d
MS		 853 bh = udf_read_ptagged(sb, newfileset, 0,
854 &ident);
cb00ea35
CG		 855 if (!bh) {
856 newfileset.logicalBlockNum++;
1da177e4
LT		 857 continue;
858 }
859
cb00ea35
CG		 860 switch (ident) {
861 case TAG_IDENT_SBD:
28de7948
CG		 862 {
863 struct spaceBitmapDesc *sp;
4b11111a
MS		 864 sp = (struct spaceBitmapDesc *)
865 bh->b_data;
28de7948
CG		 866 newfileset.logicalBlockNum += 1 +
867 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 868 sizeof(struct spaceBitmapDesc)
869 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 870 brelse(bh);
871 break;
872 }
cb00ea35 873 case TAG_IDENT_FSD:
28de7948
CG		 874 *fileset = newfileset;
875 break;
cb00ea35 876 default:
28de7948
CG		 877 newfileset.logicalBlockNum++;
878 brelse(bh);
879 bh = NULL;
880 break;
1da177e4 881 }
28de7948
CG		 882 } while (newfileset.logicalBlockNum < lastblock &&
883 fileset->logicalBlockNum == 0xFFFFFFFF &&
884 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 885 }
886 }
887
888 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 889 fileset->partitionReferenceNum != 0xFFFF) && bh) {
1da177e4 890 udf_debug("Fileset at block=%d, partition=%d\n",
cb00ea35
CG		 891 fileset->logicalBlockNum,
892 fileset->partitionReferenceNum);
1da177e4 893
6c79e987 894 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 895 udf_load_fileset(sb, bh, root);
3bf25cb4 896 brelse(bh);
1da177e4
LT		 897 return 0;
898 }
899 return 1;
900}
901
c0eb31ed 902static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 903{
904 struct primaryVolDesc *pvoldesc;
1da177e4
LT		 905 struct ustr instr;
906 struct ustr outstr;
c0eb31ed
JK		 907 struct buffer_head *bh;
908 uint16_t ident;
909
910 bh = udf_read_tagged(sb, block, block, &ident);
911 if (!bh)
912 return 1;
913 BUG_ON(ident != TAG_IDENT_PVD);
1da177e4
LT		 914
915 pvoldesc = (struct primaryVolDesc *)bh->b_data;
916
56774805
MS		 917 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
918 pvoldesc->recordingDateAndTime)) {
af15a298
MS		 919#ifdef UDFFS_DEBUG
920 timestamp *ts = &pvoldesc->recordingDateAndTime;
cbf5676a 921 udf_debug("recording time %04u/%02u/%02u"
3a71fc5d 922 " %02u:%02u (%x)\n",
af15a298
MS		 923 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
924 ts->minute, le16_to_cpu(ts->typeAndTimezone));
925#endif
1da177e4
LT		 926 }
927
4b11111a 928 if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
cb00ea35 929 if (udf_CS0toUTF8(&outstr, &instr)) {
6c79e987 930 strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
1da177e4 931 outstr.u_len > 31 ? 31 : outstr.u_len);
4b11111a
MS		 932 udf_debug("volIdent[] = '%s'\n",
933 UDF_SB(sb)->s_volume_ident);
1da177e4 934 }
1da177e4 935
4b11111a 936 if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
1da177e4
LT		 937 if (udf_CS0toUTF8(&outstr, &instr))
938 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
c0eb31ed
JK		 939
940 brelse(bh);
941 return 0;
1da177e4
LT		 942}
943
bfb257a5
JK		 944static int udf_load_metadata_files(struct super_block *sb, int partition)
945{
946 struct udf_sb_info *sbi = UDF_SB(sb);
947 struct udf_part_map *map;
948 struct udf_meta_data *mdata;
949 kernel_lb_addr addr;
950 int fe_error = 0;
951
952 map = &sbi->s_partmaps[partition];
953 mdata = &map->s_type_specific.s_metadata;
954
955 /* metadata address */
956 addr.logicalBlockNum = mdata->s_meta_file_loc;
957 addr.partitionReferenceNum = map->s_partition_num;
958
959 udf_debug("Metadata file location: block = %d part = %d\n",
960 addr.logicalBlockNum, addr.partitionReferenceNum);
961
962 mdata->s_metadata_fe = udf_iget(sb, addr);
963
964 if (mdata->s_metadata_fe == NULL) {
965 udf_warning(sb, __func__, "metadata inode efe not found, "
966 "will try mirror inode.");
967 fe_error = 1;
968 } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
969 ICBTAG_FLAG_AD_SHORT) {
970 udf_warning(sb, __func__, "metadata inode efe does not have "
971 "short allocation descriptors!");
972 fe_error = 1;
973 iput(mdata->s_metadata_fe);
974 mdata->s_metadata_fe = NULL;
975 }
976
977 /* mirror file entry */
978 addr.logicalBlockNum = mdata->s_mirror_file_loc;
979 addr.partitionReferenceNum = map->s_partition_num;
980
981 udf_debug("Mirror metadata file location: block = %d part = %d\n",
982 addr.logicalBlockNum, addr.partitionReferenceNum);
983
984 mdata->s_mirror_fe = udf_iget(sb, addr);
985
986 if (mdata->s_mirror_fe == NULL) {
987 if (fe_error) {
988 udf_error(sb, __func__, "mirror inode efe not found "
989 "and metadata inode is missing too, exiting...");
990 goto error_exit;
991 } else
992 udf_warning(sb, __func__, "mirror inode efe not found,"
993 " but metadata inode is OK");
994 } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
995 ICBTAG_FLAG_AD_SHORT) {
996 udf_warning(sb, __func__, "mirror inode efe does not have "
997 "short allocation descriptors!");
998 iput(mdata->s_mirror_fe);
999 mdata->s_mirror_fe = NULL;
1000 if (fe_error)
1001 goto error_exit;
1002 }
1003
1004 /*
1005 * bitmap file entry
1006 * Note:
1007 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1008 */
1009 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1010 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1011 addr.partitionReferenceNum = map->s_partition_num;
1012
1013 udf_debug("Bitmap file location: block = %d part = %d\n",
1014 addr.logicalBlockNum, addr.partitionReferenceNum);
1015
1016 mdata->s_bitmap_fe = udf_iget(sb, addr);
1017
1018 if (mdata->s_bitmap_fe == NULL) {
1019 if (sb->s_flags & MS_RDONLY)
1020 udf_warning(sb, __func__, "bitmap inode efe "
1021 "not found but it's ok since the disc"
1022 " is mounted read-only");
1023 else {
1024 udf_error(sb, __func__, "bitmap inode efe not "
1025 "found and attempted read-write mount");
1026 goto error_exit;
1027 }
1028 }
1029 }
1030
1031 udf_debug("udf_load_metadata_files Ok\n");
1032
1033 return 0;
1034
1035error_exit:
1036 return 1;
1037}
1038
28de7948
CG		 1039static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1040 kernel_lb_addr *root)
1da177e4
LT		 1041{
1042 struct fileSetDesc *fset;
1043
1044 fset = (struct fileSetDesc *)bh->b_data;
1045
1046 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1047
6c79e987 1048 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 1049
cb00ea35
CG		 1050 udf_debug("Rootdir at block=%d, partition=%d\n",
1051 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 1052}
1053
883cb9d1
MS		 1054int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1055{
1056 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 1057 return DIV_ROUND_UP(map->s_partition_len +
1058 (sizeof(struct spaceBitmapDesc) << 3),
1059 sb->s_blocksize * 8);
883cb9d1
MS		 1060}
1061
66e1da3f
MS		 1062static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1063{
66e1da3f
MS		 1064 struct udf_bitmap *bitmap;
1065 int nr_groups;
1066 int size;
1067
883cb9d1 1068 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 1069 size = sizeof(struct udf_bitmap) +
1070 (sizeof(struct buffer_head *) * nr_groups);
1071
1072 if (size <= PAGE_SIZE)
1073 bitmap = kmalloc(size, GFP_KERNEL);
1074 else
1075 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1076
1077 if (bitmap == NULL) {
8e24eea7 1078 udf_error(sb, __func__,
66e1da3f
MS		 1079 "Unable to allocate space for bitmap "
1080 "and %d buffer_head pointers", nr_groups);
1081 return NULL;
1082 }
1083
1084 memset(bitmap, 0x00, size);
1085 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1086 bitmap->s_nr_groups = nr_groups;
1087 return bitmap;
1088}
1089
3fb38dfa
JK		 1090static int udf_fill_partdesc_info(struct super_block *sb,
1091 struct partitionDesc *p, int p_index)
1da177e4 1092{
6c79e987 1093 struct udf_part_map *map;
165923fa 1094 struct udf_sb_info *sbi = UDF_SB(sb);
3fb38dfa 1095 struct partitionHeaderDesc *phd;
165923fa 1096
3fb38dfa 1097 map = &sbi->s_partmaps[p_index];
165923fa
MS		 1098
1099 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1100 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1101
1102 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1103 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1104 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1105 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1106 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1107 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1108 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1109 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1110
706047a7
SM		 1111 udf_debug("Partition (%d type %x) starts at physical %d, "
1112 "block length %d\n", p_index,
165923fa
MS		 1113 map->s_partition_type, map->s_partition_root,
1114 map->s_partition_len);
1115
1116 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1117 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
3fb38dfa 1118 return 0;
165923fa
MS		 1119
1120 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1121 if (phd->unallocSpaceTable.extLength) {
1122 kernel_lb_addr loc = {
1123 .logicalBlockNum = le32_to_cpu(
1124 phd->unallocSpaceTable.extPosition),
3fb38dfa 1125 .partitionReferenceNum = p_index,
165923fa
MS		 1126 };
1127
1128 map->s_uspace.s_table = udf_iget(sb, loc);
1129 if (!map->s_uspace.s_table) {
1130 udf_debug("cannot load unallocSpaceTable (part %d)\n",
3fb38dfa
JK		 1131 p_index);
1132 return 1;
165923fa
MS		 1133 }
1134 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1135 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
3fb38dfa 1136 p_index, map->s_uspace.s_table->i_ino);
165923fa
MS		 1137 }
1138
1139 if (phd->unallocSpaceBitmap.extLength) {
3fb38dfa
JK		 1140 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1141 if (!bitmap)
1142 return 1;
165923fa 1143 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1144 bitmap->s_extLength = le32_to_cpu(
165923fa 1145 phd->unallocSpaceBitmap.extLength);
2e0838fd 1146 bitmap->s_extPosition = le32_to_cpu(
165923fa 1147 phd->unallocSpaceBitmap.extPosition);
2e0838fd 1148 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
3fb38dfa 1149 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
2e0838fd 1150 bitmap->s_extPosition);
165923fa
MS		 1151 }
1152
1153 if (phd->partitionIntegrityTable.extLength)
3fb38dfa 1154 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
165923fa
MS		 1155
1156 if (phd->freedSpaceTable.extLength) {
1157 kernel_lb_addr loc = {
1158 .logicalBlockNum = le32_to_cpu(
1159 phd->freedSpaceTable.extPosition),
3fb38dfa 1160 .partitionReferenceNum = p_index,
165923fa
MS		 1161 };
1162
1163 map->s_fspace.s_table = udf_iget(sb, loc);
1164 if (!map->s_fspace.s_table) {
3fb38dfa
JK		 1165 udf_debug("cannot load freedSpaceTable (part %d)\n",
1166 p_index);
1167 return 1;
165923fa
MS		 1168 }
1169
1170 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1171 udf_debug("freedSpaceTable (part %d) @ %ld\n",
3fb38dfa 1172 p_index, map->s_fspace.s_table->i_ino);
165923fa
MS		 1173 }
1174
1175 if (phd->freedSpaceBitmap.extLength) {
3fb38dfa
JK		 1176 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1177 if (!bitmap)
1178 return 1;
165923fa 1179 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1180 bitmap->s_extLength = le32_to_cpu(
165923fa 1181 phd->freedSpaceBitmap.extLength);
2e0838fd 1182 bitmap->s_extPosition = le32_to_cpu(
165923fa 1183 phd->freedSpaceBitmap.extPosition);
2e0838fd 1184 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
3fb38dfa 1185 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
2e0838fd 1186 bitmap->s_extPosition);
165923fa 1187 }
3fb38dfa
JK		 1188 return 0;
1189}
1190
38b74a53
JK		 1191static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1192{
1193 struct udf_sb_info *sbi = UDF_SB(sb);
1194 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1195 kernel_lb_addr ino;
fa5e0815
JK		 1196 struct buffer_head *bh = NULL;
1197 struct udf_inode_info *vati;
1198 uint32_t pos;
1199 struct virtualAllocationTable20 *vat20;
38b74a53
JK		 1200
1201 /* VAT file entry is in the last recorded block */
1202 ino.partitionReferenceNum = type1_index;
1203 ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1204 sbi->s_vat_inode = udf_iget(sb, ino);
1205 if (!sbi->s_vat_inode)
1206 return 1;
1207
1208 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1209 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1210 map->s_type_specific.s_virtual.s_num_entries =
1211 (sbi->s_vat_inode->i_size - 36) >> 2;
1212 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1213 vati = UDF_I(sbi->s_vat_inode);
1214 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1215 pos = udf_block_map(sbi->s_vat_inode, 0);
1216 bh = sb_bread(sb, pos);
1217 if (!bh)
1218 return 1;
1219 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1220 } else {
1221 vat20 = (struct virtualAllocationTable20 *)
1222 vati->i_ext.i_data;
1223 }
38b74a53 1224
38b74a53 1225 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1226 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1227 map->s_type_specific.s_virtual.s_num_entries =
1228 (sbi->s_vat_inode->i_size -
1229 map->s_type_specific.s_virtual.
1230 s_start_offset) >> 2;
1231 brelse(bh);
1232 }
1233 return 0;
1234}
1235
3fb38dfa
JK		 1236static int udf_load_partdesc(struct super_block *sb, sector_t block)
1237{
1238 struct buffer_head *bh;
1239 struct partitionDesc *p;
1240 struct udf_part_map *map;
1241 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1242 int i, type1_idx;
3fb38dfa
JK		 1243 uint16_t partitionNumber;
1244 uint16_t ident;
1245 int ret = 0;
1246
1247 bh = udf_read_tagged(sb, block, block, &ident);
1248 if (!bh)
1249 return 1;
1250 if (ident != TAG_IDENT_PD)
1251 goto out_bh;
1252
1253 p = (struct partitionDesc *)bh->b_data;
1254 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1255
bfb257a5 1256 /* First scan for TYPE1, SPARABLE and METADATA partitions */
3fb38dfa
JK		 1257 for (i = 0; i < sbi->s_partitions; i++) {
1258 map = &sbi->s_partmaps[i];
1259 udf_debug("Searching map: (%d == %d)\n",
1260 map->s_partition_num, partitionNumber);
38b74a53
JK		 1261 if (map->s_partition_num == partitionNumber &&
1262 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1263 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1264 break;
1265 }
1266
38b74a53 1267 if (i >= sbi->s_partitions) {
3fb38dfa
JK		 1268 udf_debug("Partition (%d) not found in partition map\n",
1269 partitionNumber);
1270 goto out_bh;
1271 }
165923fa 1272
3fb38dfa 1273 ret = udf_fill_partdesc_info(sb, p, i);
38b74a53
JK		 1274
1275 /*
bfb257a5
JK		 1276 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1277 * PHYSICAL partitions are already set up
38b74a53
JK		 1278 */
1279 type1_idx = i;
1280 for (i = 0; i < sbi->s_partitions; i++) {
1281 map = &sbi->s_partmaps[i];
1282
1283 if (map->s_partition_num == partitionNumber &&
1284 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1285 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1286 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1287 break;
1288 }
1289
1290 if (i >= sbi->s_partitions)
1291 goto out_bh;
1292
1293 ret = udf_fill_partdesc_info(sb, p, i);
1294 if (ret)
1295 goto out_bh;
1296
bfb257a5
JK		 1297 if (map->s_partition_type == UDF_METADATA_MAP25) {
1298 ret = udf_load_metadata_files(sb, i);
1299 if (ret) {
1300 printk(KERN_ERR "UDF-fs: error loading MetaData "
1301 "partition map %d\n", i);
1302 goto out_bh;
1303 }
1304 } else {
1305 ret = udf_load_vat(sb, i, type1_idx);
1306 if (ret)
1307 goto out_bh;
1308 /*
1309 * Mark filesystem read-only if we have a partition with
1310 * virtual map since we don't handle writing to it (we
1311 * overwrite blocks instead of relocating them).
1312 */
1313 sb->s_flags |= MS_RDONLY;
1314 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1315 "because writing to pseudooverwrite partition is "
1316 "not implemented.\n");
1317 }
c0eb31ed 1318out_bh:
2e0838fd 1319 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1320 brelse(bh);
1321 return ret;
1da177e4
LT		 1322}
1323
c0eb31ed 1324static int udf_load_logicalvol(struct super_block *sb, sector_t block,
28de7948 1325 kernel_lb_addr *fileset)
1da177e4
LT		 1326{
1327 struct logicalVolDesc *lvd;
1328 int i, j, offset;
1329 uint8_t type;
6c79e987 1330 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1331 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1332 uint16_t ident;
1333 struct buffer_head *bh;
1334 int ret = 0;
1da177e4 1335
c0eb31ed
JK		 1336 bh = udf_read_tagged(sb, block, block, &ident);
1337 if (!bh)
1338 return 1;
1339 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4
LT		 1340 lvd = (struct logicalVolDesc *)bh->b_data;
1341
dc5d39be 1342 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
c0eb31ed
JK		 1343 if (i != 0) {
1344 ret = i;
1345 goto out_bh;
1346 }
1da177e4 1347
cb00ea35 1348 for (i = 0, offset = 0;
6c79e987 1349 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
4b11111a
MS		 1350 i++, offset += gpm->partitionMapLength) {
1351 struct udf_part_map *map = &sbi->s_partmaps[i];
1352 gpm = (struct genericPartitionMap *)
1353 &(lvd->partitionMaps[offset]);
1354 type = gpm->partitionMapType;
cb00ea35 1355 if (type == 1) {
4b11111a
MS		 1356 struct genericPartitionMap1 *gpm1 =
1357 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1358 map->s_partition_type = UDF_TYPE1_MAP15;
1359 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1360 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1361 map->s_partition_func = NULL;
cb00ea35 1362 } else if (type == 2) {
4b11111a
MS		 1363 struct udfPartitionMap2 *upm2 =
1364 (struct udfPartitionMap2 *)gpm;
1365 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1366 strlen(UDF_ID_VIRTUAL))) {
1367 u16 suf =
1368 le16_to_cpu(((__le16 *)upm2->partIdent.
1369 identSuffix)[0]);
c82a1275 1370 if (suf < 0x0200) {
4b11111a
MS		 1371 map->s_partition_type =
1372 UDF_VIRTUAL_MAP15;
1373 map->s_partition_func =
1374 udf_get_pblock_virt15;
c82a1275 1375 } else {
4b11111a
MS		 1376 map->s_partition_type =
1377 UDF_VIRTUAL_MAP20;
1378 map->s_partition_func =
1379 udf_get_pblock_virt20;
1da177e4 1380 }
4b11111a
MS		 1381 } else if (!strncmp(upm2->partIdent.ident,
1382 UDF_ID_SPARABLE,
1383 strlen(UDF_ID_SPARABLE))) {
1da177e4 1384 uint32_t loc;
1da177e4 1385 struct sparingTable *st;
4b11111a
MS		 1386 struct sparablePartitionMap *spm =
1387 (struct sparablePartitionMap *)gpm;
28de7948 1388
6c79e987 1389 map->s_partition_type = UDF_SPARABLE_MAP15;
4b11111a
MS		 1390 map->s_type_specific.s_sparing.s_packet_len =
1391 le16_to_cpu(spm->packetLength);
cb00ea35 1392 for (j = 0; j < spm->numSparingTables; j++) {
4b11111a
MS		 1393 struct buffer_head *bh2;
1394
1395 loc = le32_to_cpu(
1396 spm->locSparingTable[j]);
1397 bh2 = udf_read_tagged(sb, loc, loc,
1398 &ident);
1399 map->s_type_specific.s_sparing.
1400 s_spar_map[j] = bh2;
1401
165923fa
MS		 1402 if (bh2 == NULL)
1403 continue;
1404
1405 st = (struct sparingTable *)bh2->b_data;
1406 if (ident != 0 || strncmp(
1407 st->sparingIdent.ident,
1408 UDF_ID_SPARING,
1409 strlen(UDF_ID_SPARING))) {
1410 brelse(bh2);
1411 map->s_type_specific.s_sparing.
1412 s_spar_map[j] = NULL;
1da177e4
LT		 1413 }
1414 }
6c79e987 1415 map->s_partition_func = udf_get_pblock_spar15;
bfb257a5
JK		 1416 } else if (!strncmp(upm2->partIdent.ident,
1417 UDF_ID_METADATA,
1418 strlen(UDF_ID_METADATA))) {
1419 struct udf_meta_data *mdata =
1420 &map->s_type_specific.s_metadata;
1421 struct metadataPartitionMap *mdm =
1422 (struct metadataPartitionMap *)
1423 &(lvd->partitionMaps[offset]);
1424 udf_debug("Parsing Logical vol part %d "
1425 "type %d id=%s\n", i, type,
1426 UDF_ID_METADATA);
1427
1428 map->s_partition_type = UDF_METADATA_MAP25;
1429 map->s_partition_func = udf_get_pblock_meta25;
1430
1431 mdata->s_meta_file_loc =
1432 le32_to_cpu(mdm->metadataFileLoc);
1433 mdata->s_mirror_file_loc =
1434 le32_to_cpu(mdm->metadataMirrorFileLoc);
1435 mdata->s_bitmap_file_loc =
1436 le32_to_cpu(mdm->metadataBitmapFileLoc);
1437 mdata->s_alloc_unit_size =
1438 le32_to_cpu(mdm->allocUnitSize);
1439 mdata->s_align_unit_size =
1440 le16_to_cpu(mdm->alignUnitSize);
1441 mdata->s_dup_md_flag =
1442 mdm->flags & 0x01;
1443
1444 udf_debug("Metadata Ident suffix=0x%x\n",
1445 (le16_to_cpu(
1446 ((__le16 *)
1447 mdm->partIdent.identSuffix)[0])));
1448 udf_debug("Metadata part num=%d\n",
1449 le16_to_cpu(mdm->partitionNum));
1450 udf_debug("Metadata part alloc unit size=%d\n",
1451 le32_to_cpu(mdm->allocUnitSize));
1452 udf_debug("Metadata file loc=%d\n",
1453 le32_to_cpu(mdm->metadataFileLoc));
1454 udf_debug("Mirror file loc=%d\n",
1455 le32_to_cpu(mdm->metadataMirrorFileLoc));
1456 udf_debug("Bitmap file loc=%d\n",
1457 le32_to_cpu(mdm->metadataBitmapFileLoc));
1458 udf_debug("Duplicate Flag: %d %d\n",
1459 mdata->s_dup_md_flag, mdm->flags);
cb00ea35 1460 } else {
3a71fc5d
MS		 1461 udf_debug("Unknown ident: %s\n",
1462 upm2->partIdent.ident);
1da177e4
LT		 1463 continue;
1464 }
6c79e987
MS		 1465 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1466 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4
LT		 1467 }
1468 udf_debug("Partition (%d:%d) type %d on volume %d\n",
6c79e987
MS		 1469 i, map->s_partition_num, type,
1470 map->s_volumeseqnum);
1da177e4
LT		 1471 }
1472
cb00ea35 1473 if (fileset) {
28de7948 1474 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1475
1476 *fileset = lelb_to_cpu(la->extLocation);
3a71fc5d
MS		 1477 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1478 "partition=%d\n", fileset->logicalBlockNum,
28de7948 1479 fileset->partitionReferenceNum);
1da177e4
LT		 1480 }
1481 if (lvd->integritySeqExt.extLength)
1482 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
28de7948 1483
c0eb31ed
JK		 1484out_bh:
1485 brelse(bh);
1486 return ret;
1da177e4
LT		 1487}
1488
1489/*
1490 * udf_load_logicalvolint
1491 *
1492 */
cb00ea35 1493static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1da177e4
LT		 1494{
1495 struct buffer_head *bh = NULL;
1496 uint16_t ident;
6c79e987
MS		 1497 struct udf_sb_info *sbi = UDF_SB(sb);
1498 struct logicalVolIntegrityDesc *lvid;
1da177e4
LT		 1499
1500 while (loc.extLength > 0 &&
cb00ea35
CG		 1501 (bh = udf_read_tagged(sb, loc.extLocation,
1502 loc.extLocation, &ident)) &&
1503 ident == TAG_IDENT_LVID) {
6c79e987
MS		 1504 sbi->s_lvid_bh = bh;
1505 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
cb00ea35 1506
6c79e987 1507 if (lvid->nextIntegrityExt.extLength)
3a71fc5d 1508 udf_load_logicalvolint(sb,
6c79e987 1509 leea_to_cpu(lvid->nextIntegrityExt));
cb00ea35 1510
6c79e987 1511 if (sbi->s_lvid_bh != bh)
3bf25cb4 1512 brelse(bh);
1da177e4 1513 loc.extLength -= sb->s_blocksize;
cb00ea35 1514 loc.extLocation++;
1da177e4 1515 }
6c79e987 1516 if (sbi->s_lvid_bh != bh)
3bf25cb4 1517 brelse(bh);
1da177e4
LT		 1518}
1519
1520/*
1521 * udf_process_sequence
1522 *
1523 * PURPOSE
1524 * Process a main/reserve volume descriptor sequence.
1525 *
1526 * PRE-CONDITIONS
1527 * sb Pointer to _locked_ superblock.
1528 * block First block of first extent of the sequence.
1529 * lastblock Lastblock of first extent of the sequence.
1530 *
1531 * HISTORY
1532 * July 1, 1997 - Andrew E. Mileski
1533 * Written, tested, and released.
1534 */
200a3592 1535static noinline int udf_process_sequence(struct super_block *sb, long block,
3a71fc5d 1536 long lastblock, kernel_lb_addr *fileset)
1da177e4
LT		 1537{
1538 struct buffer_head *bh = NULL;
1539 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1540 struct udf_vds_record *curr;
1da177e4
LT		 1541 struct generic_desc *gd;
1542 struct volDescPtr *vdp;
cb00ea35 1543 int done = 0;
1da177e4
LT		 1544 uint32_t vdsn;
1545 uint16_t ident;
1546 long next_s = 0, next_e = 0;
1547
1548 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1549
c0eb31ed
JK		 1550 /*
1551 * Read the main descriptor sequence and find which descriptors
1552 * are in it.
1553 */
cb00ea35 1554 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1555
1556 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed
JK		 1557 if (!bh) {
1558 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1559 "sequence is corrupted or we could not read "
1560 "it.\n", (unsigned long long)block);
1561 return 1;
1562 }
1da177e4
LT		 1563
1564 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1565 gd = (struct generic_desc *)bh->b_data;
1566 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1567 switch (ident) {
28de7948 1568 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1569 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1570 if (vdsn >= curr->volDescSeqNum) {
1571 curr->volDescSeqNum = vdsn;
1572 curr->block = block;
cb00ea35
CG		 1573 }
1574 break;
28de7948 1575 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
4b11111a
MS		 1576 curr = &vds[VDS_POS_VOL_DESC_PTR];
1577 if (vdsn >= curr->volDescSeqNum) {
1578 curr->volDescSeqNum = vdsn;
1579 curr->block = block;
cb00ea35
CG		 1580
1581 vdp = (struct volDescPtr *)bh->b_data;
4b11111a
MS		 1582 next_s = le32_to_cpu(
1583 vdp->nextVolDescSeqExt.extLocation);
1584 next_e = le32_to_cpu(
1585 vdp->nextVolDescSeqExt.extLength);
cb00ea35
CG		 1586 next_e = next_e >> sb->s_blocksize_bits;
1587 next_e += next_s;
1588 }
1589 break;
28de7948 1590 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1591 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1592 if (vdsn >= curr->volDescSeqNum) {
1593 curr->volDescSeqNum = vdsn;
1594 curr->block = block;
cb00ea35
CG		 1595 }
1596 break;
28de7948 1597 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1598 curr = &vds[VDS_POS_PARTITION_DESC];
1599 if (!curr->block)
1600 curr->block = block;
cb00ea35 1601 break;
28de7948 1602 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1603 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1604 if (vdsn >= curr->volDescSeqNum) {
1605 curr->volDescSeqNum = vdsn;
1606 curr->block = block;
cb00ea35
CG		 1607 }
1608 break;
28de7948 1609 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1610 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1611 if (vdsn >= curr->volDescSeqNum) {
1612 curr->volDescSeqNum = vdsn;
1613 curr->block = block;
cb00ea35
CG		 1614 }
1615 break;
28de7948 1616 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
cb00ea35
CG		 1617 vds[VDS_POS_TERMINATING_DESC].block = block;
1618 if (next_e) {
1619 block = next_s;
1620 lastblock = next_e;
1621 next_s = next_e = 0;
4b11111a 1622 } else
cb00ea35
CG		 1623 done = 1;
1624 break;
1da177e4 1625 }
3bf25cb4 1626 brelse(bh);
1da177e4 1627 }
c0eb31ed
JK		 1628 /*
1629 * Now read interesting descriptors again and process them
1630 * in a suitable order
1631 */
1632 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1633 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1634 return 1;
1635 }
1636 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1637 return 1;
165923fa 1638
c0eb31ed
JK		 1639 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1640 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1641 return 1;
165923fa 1642
c0eb31ed
JK		 1643 if (vds[VDS_POS_PARTITION_DESC].block) {
1644 /*
1645 * We rescan the whole descriptor sequence to find
1646 * partition descriptor blocks and process them.
1647 */
1648 for (block = vds[VDS_POS_PARTITION_DESC].block;
1649 block < vds[VDS_POS_TERMINATING_DESC].block;
1650 block++)
1651 if (udf_load_partdesc(sb, block))
165923fa 1652 return 1;
1da177e4
LT		 1653 }
1654
1655 return 0;
1656}
1657
1658/*
1659 * udf_check_valid()
1660 */
cb00ea35 1661static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1da177e4
LT		 1662{
1663 long block;
d0db181c 1664 struct udf_sb_info *sbi = UDF_SB(sb);
1da177e4 1665
cb00ea35 1666 if (novrs) {
1da177e4
LT		 1667 udf_debug("Validity check skipped because of novrs option\n");
1668 return 0;
1669 }
1670 /* Check that it is NSR02 compliant */
1671 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
165923fa 1672 block = udf_vrs(sb, silent);
d0db181c
PE		 1673 if (block == -1)
1674 udf_debug("Failed to read byte 32768. Assuming open "
1675 "disc. Skipping validity check\n");
1676 if (block && !sbi->s_last_block)
165923fa 1677 sbi->s_last_block = udf_get_last_block(sb);
d0db181c 1678 return !block;
1da177e4
LT		 1679}
1680
38b74a53 1681static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1da177e4
LT		 1682{
1683 struct anchorVolDescPtr *anchor;
1684 uint16_t ident;
1685 struct buffer_head *bh;
1686 long main_s, main_e, reserve_s, reserve_e;
38b74a53 1687 int i;
6c79e987 1688 struct udf_sb_info *sbi;
1da177e4
LT		 1689
1690 if (!sb)
1691 return 1;
6c79e987 1692 sbi = UDF_SB(sb);
1da177e4 1693
6c79e987 1694 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
28f7c4d4
MS		 1695 if (!sbi->s_anchor[i])
1696 continue;
165923fa 1697
28f7c4d4
MS		 1698 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1699 &ident);
1700 if (!bh)
1701 continue;
1702
1703 anchor = (struct anchorVolDescPtr *)bh->b_data;
1704
1705 /* Locate the main sequence */
1706 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1707 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1708 main_e = main_e >> sb->s_blocksize_bits;
1709 main_e += main_s;
1710
1711 /* Locate the reserve sequence */
1712 reserve_s = le32_to_cpu(
4b11111a 1713 anchor->reserveVolDescSeqExt.extLocation);
28f7c4d4 1714 reserve_e = le32_to_cpu(
4b11111a 1715 anchor->reserveVolDescSeqExt.extLength);
28f7c4d4
MS		 1716 reserve_e = reserve_e >> sb->s_blocksize_bits;
1717 reserve_e += reserve_s;
1da177e4 1718
28f7c4d4 1719 brelse(bh);
1da177e4 1720
28f7c4d4
MS		 1721 /* Process the main & reserve sequences */
1722 /* responsible for finding the PartitionDesc(s) */
1723 if (!(udf_process_sequence(sb, main_s, main_e,
1724 fileset) &&
1725 udf_process_sequence(sb, reserve_s, reserve_e,
1726 fileset)))
1727 break;
1da177e4
LT		 1728 }
1729
6c79e987 1730 if (i == ARRAY_SIZE(sbi->s_anchor)) {
1da177e4
LT		 1731 udf_debug("No Anchor block found\n");
1732 return 1;
28f7c4d4
MS		 1733 }
1734 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1da177e4 1735
1da177e4
LT		 1736 return 0;
1737}
1738
1739static void udf_open_lvid(struct super_block *sb)
1740{
6c79e987
MS		 1741 struct udf_sb_info *sbi = UDF_SB(sb);
1742 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1743 struct logicalVolIntegrityDesc *lvid;
1744 struct logicalVolIntegrityDescImpUse *lvidiu;
1745 if (!bh)
1746 return;
1747
1748 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1749 lvidiu = udf_sb_lvidiu(sbi);
1750
1751 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1752 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1753 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1754 CURRENT_TIME);
1755 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1756
1757 lvid->descTag.descCRC = cpu_to_le16(
f845fced
BC		 1758 crc_itu_t(0, (char *)lvid + sizeof(tag),
1759 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1760
1761 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1762 mark_buffer_dirty(bh);
1da177e4
LT		 1763}
1764
1765static void udf_close_lvid(struct super_block *sb)
1766{
6c79e987
MS		 1767 struct udf_sb_info *sbi = UDF_SB(sb);
1768 struct buffer_head *bh = sbi->s_lvid_bh;
1769 struct logicalVolIntegrityDesc *lvid;
165923fa 1770 struct logicalVolIntegrityDescImpUse *lvidiu;
28de7948 1771
6c79e987
MS		 1772 if (!bh)
1773 return;
1774
1775 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1776
165923fa
MS		 1777 if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1778 return;
1779
1780 lvidiu = udf_sb_lvidiu(sbi);
1781 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1782 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1783 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1784 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1785 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1786 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1787 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1788 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1789 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1790 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1791
1792 lvid->descTag.descCRC = cpu_to_le16(
f845fced
BC		 1793 crc_itu_t(0, (char *)lvid + sizeof(tag),
1794 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1795
1796 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1797 mark_buffer_dirty(bh);
1da177e4
LT		 1798}
1799
66e1da3f
MS		 1800static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1801{
1802 int i;
1803 int nr_groups = bitmap->s_nr_groups;
4b11111a
MS		 1804 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1805 nr_groups);
66e1da3f
MS		 1806
1807 for (i = 0; i < nr_groups; i++)
1808 if (bitmap->s_block_bitmap[i])
1809 brelse(bitmap->s_block_bitmap[i]);
1810
1811 if (size <= PAGE_SIZE)
1812 kfree(bitmap);
1813 else
1814 vfree(bitmap);
1815}
1816
2e0838fd
JK		 1817static void udf_free_partition(struct udf_part_map *map)
1818{
1819 int i;
bfb257a5 1820 struct udf_meta_data *mdata;
2e0838fd
JK		 1821
1822 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1823 iput(map->s_uspace.s_table);
1824 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1825 iput(map->s_fspace.s_table);
1826 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1827 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1828 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1829 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1830 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1831 for (i = 0; i < 4; i++)
1832 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
bfb257a5
JK		 1833 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1834 mdata = &map->s_type_specific.s_metadata;
1835 iput(mdata->s_metadata_fe);
1836 mdata->s_metadata_fe = NULL;
1837
1838 iput(mdata->s_mirror_fe);
1839 mdata->s_mirror_fe = NULL;
1840
1841 iput(mdata->s_bitmap_fe);
1842 mdata->s_bitmap_fe = NULL;
1843 }
2e0838fd
JK		 1844}
1845
1da177e4
LT		 1846static int udf_fill_super(struct super_block *sb, void *options, int silent)
1847{
1848 int i;
cb00ea35 1849 struct inode *inode = NULL;
1da177e4
LT		 1850 struct udf_options uopt;
1851 kernel_lb_addr rootdir, fileset;
1852 struct udf_sb_info *sbi;
1853
1854 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1855 uopt.uid = -1;
1856 uopt.gid = -1;
1857 uopt.umask = 0;
1858
6c79e987 1859 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1da177e4
LT		 1860 if (!sbi)
1861 return -ENOMEM;
28de7948 1862
1da177e4 1863 sb->s_fs_info = sbi;
1da177e4 1864
1e7933de 1865 mutex_init(&sbi->s_alloc_mutex);
1da177e4 1866
6da80894 1867 if (!udf_parse_options((char *)options, &uopt, false))
1da177e4
LT		 1868 goto error_out;
1869
1870 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 1871 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1da177e4 1872 udf_error(sb, "udf_read_super",
cb00ea35 1873 "utf8 cannot be combined with iocharset\n");
1da177e4
LT		 1874 goto error_out;
1875 }
1876#ifdef CONFIG_UDF_NLS
cb00ea35 1877 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 1878 uopt.nls_map = load_nls_default();
1879 if (!uopt.nls_map)
1880 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1881 else
1882 udf_debug("Using default NLS map\n");
1883 }
1884#endif
1885 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1886 uopt.flags |= (1 << UDF_FLAG_UTF8);
1887
1888 fileset.logicalBlockNum = 0xFFFFFFFF;
1889 fileset.partitionReferenceNum = 0xFFFF;
1890
6c79e987
MS		 1891 sbi->s_flags = uopt.flags;
1892 sbi->s_uid = uopt.uid;
1893 sbi->s_gid = uopt.gid;
1894 sbi->s_umask = uopt.umask;
1895 sbi->s_nls_map = uopt.nls_map;
1da177e4
LT		 1896
1897 /* Set the block size for all transfers */
f1f73ba8
CH		 1898 if (!sb_min_blocksize(sb, uopt.blocksize)) {
1899 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1900 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1da177e4 1901 goto error_out;
f1f73ba8 1902 }
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
6c79e987
MS		 1911 sbi->s_last_block = uopt.lastblock;
1912 sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1913 sbi->s_anchor[2] = uopt.anchor;
1da177e4 1914
3a71fc5d
MS		 1915 if (udf_check_valid(sb, uopt.novrs, silent)) {
1916 /* read volume recognition sequences */
1917 printk(KERN_WARNING "UDF-fs: No VRS found\n");
cb00ea35 1918 goto error_out;
1da177e4
LT		 1919 }
1920
1921 udf_find_anchor(sb);
1922
1923 /* Fill in the rest of the superblock */
1924 sb->s_op = &udf_sb_ops;
221e583a 1925 sb->s_export_op = &udf_export_ops;
1da177e4
LT		 1926 sb->dq_op = NULL;
1927 sb->s_dirt = 0;
1928 sb->s_magic = UDF_SUPER_MAGIC;
1929 sb->s_time_gran = 1000;
1930
38b74a53 1931 if (udf_load_sequence(sb, &fileset)) {
3a71fc5d 1932 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1da177e4
LT		 1933 goto error_out;
1934 }
1935
6c79e987 1936 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1da177e4 1937
6c79e987 1938 if (sbi->s_lvid_bh) {
4b11111a
MS		 1939 struct logicalVolIntegrityDescImpUse *lvidiu =
1940 udf_sb_lvidiu(sbi);
6c79e987
MS		 1941 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1942 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
4b11111a
MS		 1943 /* uint16_t maxUDFWriteRev =
1944 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1da177e4 1945
cb00ea35 1946 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
4b11111a
MS		 1947 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1948 "(max is %x)\n",
6c79e987 1949 le16_to_cpu(lvidiu->minUDFReadRev),
cb00ea35 1950 UDF_MAX_READ_VERSION);
1da177e4 1951 goto error_out;
4b11111a 1952 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1da177e4 1953 sb->s_flags |= MS_RDONLY;
1da177e4 1954
6c79e987 1955 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 1956
1957 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1958 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1959 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1960 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1961 }
1962
6c79e987 1963 if (!sbi->s_partitions) {
3a71fc5d 1964 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1da177e4
LT		 1965 goto error_out;
1966 }
1967
4b11111a
MS		 1968 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1969 UDF_PART_FLAG_READ_ONLY) {
1970 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1971 "forcing readonly mount\n");
39b3f6d6 1972 sb->s_flags |= MS_RDONLY;
c1a26e7d 1973 }
39b3f6d6 1974
cb00ea35 1975 if (udf_find_fileset(sb, &fileset, &rootdir)) {
3a71fc5d 1976 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1da177e4
LT		 1977 goto error_out;
1978 }
1979
cb00ea35 1980 if (!silent) {
56774805
MS		 1981 timestamp ts;
1982 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
a9ca6635 1983 udf_info("UDF: Mounting volume '%s', "
28de7948 1984 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
56774805
MS		 1985 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1986 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4
LT		 1987 }
1988 if (!(sb->s_flags & MS_RDONLY))
1989 udf_open_lvid(sb);
1990
1991 /* Assign the root inode */
1992 /* assign inodes by physical block number */
1993 /* perhaps it's not extensible enough, but for now ... */
cb00ea35
CG		 1994 inode = udf_iget(sb, rootdir);
1995 if (!inode) {
4b11111a
MS		 1996 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1997 "partition=%d\n",
cb00ea35 1998 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1da177e4
LT		 1999 goto error_out;
2000 }
2001
2002 /* Allocate a dentry for the root inode */
2003 sb->s_root = d_alloc_root(inode);
cb00ea35 2004 if (!sb->s_root) {
3a71fc5d 2005 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1da177e4
LT		 2006 iput(inode);
2007 goto error_out;
2008 }
31170b6a 2009 sb->s_maxbytes = MAX_LFS_FILESIZE;
1da177e4
LT		 2010 return 0;
2011
28de7948 2012error_out:
6c79e987
MS		 2013 if (sbi->s_vat_inode)
2014 iput(sbi->s_vat_inode);
2e0838fd
JK		 2015 if (sbi->s_partitions)
2016 for (i = 0; i < sbi->s_partitions; i++)
2017 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2018#ifdef CONFIG_UDF_NLS
2019 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2020 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2021#endif
2022 if (!(sb->s_flags & MS_RDONLY))
2023 udf_close_lvid(sb);
6c79e987
MS		 2024 brelse(sbi->s_lvid_bh);
2025
2026 kfree(sbi->s_partmaps);
1da177e4
LT		 2027 kfree(sbi);
2028 sb->s_fs_info = NULL;
28de7948 2029
1da177e4
LT		 2030 return -EINVAL;
2031}
2032
b8145a76
AB		 2033static void udf_error(struct super_block *sb, const char *function,
2034 const char *fmt, ...)
1da177e4
LT		 2035{
2036 va_list args;
2037
cb00ea35 2038 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 2039 /* mark sb error */
2040 sb->s_dirt = 1;
2041 }
2042 va_start(args, fmt);
4a6e617a 2043 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 2044 va_end(args);
3a71fc5d 2045 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
28de7948 2046 sb->s_id, function, error_buf);
1da177e4
LT		 2047}
2048
2049void udf_warning(struct super_block *sb, const char *function,
cb00ea35 2050 const char *fmt, ...)
1da177e4
LT		 2051{
2052 va_list args;
2053
cb00ea35 2054 va_start(args, fmt);
4a6e617a 2055 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4
LT		 2056 va_end(args);
2057 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
cb00ea35 2058 sb->s_id, function, error_buf);
1da177e4
LT		 2059}
2060
cb00ea35 2061static void udf_put_super(struct super_block *sb)
1da177e4
LT		 2062{
2063 int i;
6c79e987 2064 struct udf_sb_info *sbi;
1da177e4 2065
6c79e987
MS		 2066 sbi = UDF_SB(sb);
2067 if (sbi->s_vat_inode)
2068 iput(sbi->s_vat_inode);
2e0838fd
JK		 2069 if (sbi->s_partitions)
2070 for (i = 0; i < sbi->s_partitions; i++)
2071 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2072#ifdef CONFIG_UDF_NLS
2073 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2074 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2075#endif
2076 if (!(sb->s_flags & MS_RDONLY))
2077 udf_close_lvid(sb);
6c79e987
MS		 2078 brelse(sbi->s_lvid_bh);
2079 kfree(sbi->s_partmaps);
1da177e4
LT		 2080 kfree(sb->s_fs_info);
2081 sb->s_fs_info = NULL;
2082}
2083
cb00ea35 2084static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 2085{
726c3342 2086 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 2087 struct udf_sb_info *sbi = UDF_SB(sb);
2088 struct logicalVolIntegrityDescImpUse *lvidiu;
2089
2090 if (sbi->s_lvid_bh != NULL)
2091 lvidiu = udf_sb_lvidiu(sbi);
2092 else
2093 lvidiu = NULL;
726c3342 2094
1da177e4
LT		 2095 buf->f_type = UDF_SUPER_MAGIC;
2096 buf->f_bsize = sb->s_blocksize;
6c79e987 2097 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 2098 buf->f_bfree = udf_count_free(sb);
2099 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 2100 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2101 le32_to_cpu(lvidiu->numDirs)) : 0)
2102 + buf->f_bfree;
1da177e4
LT		 2103 buf->f_ffree = buf->f_bfree;
2104 /* __kernel_fsid_t f_fsid */
cb00ea35 2105 buf->f_namelen = UDF_NAME_LEN - 2;
1da177e4
LT		 2106
2107 return 0;
2108}
2109
4b11111a
MS		 2110static unsigned int udf_count_free_bitmap(struct super_block *sb,
2111 struct udf_bitmap *bitmap)
1da177e4
LT		 2112{
2113 struct buffer_head *bh = NULL;
2114 unsigned int accum = 0;
2115 int index;
2116 int block = 0, newblock;
2117 kernel_lb_addr loc;
2118 uint32_t bytes;
1da177e4
LT		 2119 uint8_t *ptr;
2120 uint16_t ident;
2121 struct spaceBitmapDesc *bm;
2122
2123 lock_kernel();
2124
2125 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 2126 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1da177e4
LT		 2127 bh = udf_read_ptagged(sb, loc, 0, &ident);
2128
cb00ea35 2129 if (!bh) {
1da177e4
LT		 2130 printk(KERN_ERR "udf: udf_count_free failed\n");
2131 goto out;
cb00ea35 2132 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 2133 brelse(bh);
1da177e4
LT		 2134 printk(KERN_ERR "udf: udf_count_free failed\n");
2135 goto out;
2136 }
2137
2138 bm = (struct spaceBitmapDesc *)bh->b_data;
2139 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 2140 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2141 ptr = (uint8_t *)bh->b_data;
1da177e4 2142
cb00ea35 2143 while (bytes > 0) {
01b954a3
MS		 2144 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2145 accum += bitmap_weight((const unsigned long *)(ptr + index),
2146 cur_bytes * 8);
2147 bytes -= cur_bytes;
cb00ea35 2148 if (bytes) {
3bf25cb4 2149 brelse(bh);
1da177e4
LT		 2150 newblock = udf_get_lb_pblock(sb, loc, ++block);
2151 bh = udf_tread(sb, newblock);
cb00ea35 2152 if (!bh) {
1da177e4
LT		 2153 udf_debug("read failed\n");
2154 goto out;
2155 }
2156 index = 0;
28de7948 2157 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2158 }
2159 }
3bf25cb4 2160 brelse(bh);
1da177e4 2161
28de7948 2162out:
1da177e4
LT		 2163 unlock_kernel();
2164
2165 return accum;
2166}
2167
4b11111a
MS		 2168static unsigned int udf_count_free_table(struct super_block *sb,
2169 struct inode *table)
1da177e4
LT		 2170{
2171 unsigned int accum = 0;
ff116fc8
JK		 2172 uint32_t elen;
2173 kernel_lb_addr eloc;
1da177e4 2174 int8_t etype;
ff116fc8 2175 struct extent_position epos;
1da177e4
LT		 2176
2177 lock_kernel();
2178
c0b34438 2179 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2180 epos.offset = sizeof(struct unallocSpaceEntry);
2181 epos.bh = NULL;
1da177e4 2182
3a71fc5d 2183 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2184 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2185
3bf25cb4 2186 brelse(epos.bh);
1da177e4
LT		 2187
2188 unlock_kernel();
2189
2190 return accum;
2191}
cb00ea35
CG		 2192
2193static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2194{
2195 unsigned int accum = 0;
6c79e987
MS		 2196 struct udf_sb_info *sbi;
2197 struct udf_part_map *map;
1da177e4 2198
6c79e987
MS		 2199 sbi = UDF_SB(sb);
2200 if (sbi->s_lvid_bh) {
4b11111a
MS		 2201 struct logicalVolIntegrityDesc *lvid =
2202 (struct logicalVolIntegrityDesc *)
2203 sbi->s_lvid_bh->b_data;
6c79e987 2204 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2205 accum = le32_to_cpu(
2206 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2207 if (accum == 0xFFFFFFFF)
2208 accum = 0;
2209 }
2210 }
2211
2212 if (accum)
2213 return accum;
2214
6c79e987
MS		 2215 map = &sbi->s_partmaps[sbi->s_partition];
2216 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2217 accum += udf_count_free_bitmap(sb,
6c79e987 2218 map->s_uspace.s_bitmap);
1da177e4 2219 }
6c79e987 2220 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2221 accum += udf_count_free_bitmap(sb,
6c79e987 2222 map->s_fspace.s_bitmap);
1da177e4
LT		 2223 }
2224 if (accum)
2225 return accum;
2226
6c79e987 2227 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2228 accum += udf_count_free_table(sb,
6c79e987 2229 map->s_uspace.s_table);
1da177e4 2230 }
6c79e987 2231 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2232 accum += udf_count_free_table(sb,
6c79e987 2233 map->s_fspace.s_table);
1da177e4
LT		 2234 }
2235
2236 return accum;
2237}
Linux 6.x block layer and io_uring tree(s)