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Merge commit 'v2.6.31-rc8' into next
[mirror_ubuntu-jammy-kernel.git] / fs / udf / super.c
CommitLineData
1da177e4
LT		 1/*
2 * super.c
3 *
4 * PURPOSE
5 * Super block routines for the OSTA-UDF(tm) filesystem.
6 *
7 * DESCRIPTION
8 * OSTA-UDF(tm) = Optical Storage Technology Association
9 * Universal Disk Format.
10 *
11 * This code is based on version 2.00 of the UDF specification,
12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13 * http://www.osta.org/
14 * http://www.ecma.ch/
15 * http://www.iso.org/
16 *
1da177e4
LT		 17 * COPYRIGHT
18 * This file is distributed under the terms of the GNU General Public
19 * License (GPL). Copies of the GPL can be obtained from:
20 * ftp://prep.ai.mit.edu/pub/gnu/GPL
21 * Each contributing author retains all rights to their own work.
22 *
23 * (C) 1998 Dave Boynton
24 * (C) 1998-2004 Ben Fennema
25 * (C) 2000 Stelias Computing Inc
26 *
27 * HISTORY
28 *
29 * 09/24/98 dgb changed to allow compiling outside of kernel, and
30 * added some debugging.
31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
32 * 10/16/98 attempting some multi-session support
33 * 10/17/98 added freespace count for "df"
34 * 11/11/98 gr added novrs option
35 * 11/26/98 dgb added fileset,anchor mount options
3a71fc5d
MS		 36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
1da177e4
LT		 38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
cb00ea35 41#include "udfdecl.h"
1da177e4 42
1da177e4
LT		 43#include <linux/blkdev.h>
44#include <linux/slab.h>
45#include <linux/kernel.h>
46#include <linux/module.h>
47#include <linux/parser.h>
48#include <linux/stat.h>
49#include <linux/cdrom.h>
50#include <linux/nls.h>
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;
4bf17af0 1090 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
38b74a53
JK		 1091
1092 /* VAT file entry is in the last recorded block */
1093 ino.partitionReferenceNum = type1_index;
1094 ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
97e961fd 1095 sbi->s_vat_inode = udf_iget(sb, &ino);
4bf17af0
JK		 1096 if (!sbi->s_vat_inode &&
1097 sbi->s_last_block != blocks - 1) {
1098 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1099 " last recorded block (%lu), retrying with the last "
1100 "block of the device (%lu).\n",
1101 (unsigned long)sbi->s_last_block,
1102 (unsigned long)blocks - 1);
1103 ino.partitionReferenceNum = type1_index;
1104 ino.logicalBlockNum = blocks - 1 - map->s_partition_root;
1105 sbi->s_vat_inode = udf_iget(sb, &ino);
1106 }
38b74a53
JK		 1107 if (!sbi->s_vat_inode)
1108 return 1;
1109
1110 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1111 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1112 map->s_type_specific.s_virtual.s_num_entries =
1113 (sbi->s_vat_inode->i_size - 36) >> 2;
1114 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1115 vati = UDF_I(sbi->s_vat_inode);
1116 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1117 pos = udf_block_map(sbi->s_vat_inode, 0);
1118 bh = sb_bread(sb, pos);
1119 if (!bh)
1120 return 1;
1121 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1122 } else {
1123 vat20 = (struct virtualAllocationTable20 *)
1124 vati->i_ext.i_data;
1125 }
38b74a53 1126
38b74a53 1127 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1128 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1129 map->s_type_specific.s_virtual.s_num_entries =
1130 (sbi->s_vat_inode->i_size -
1131 map->s_type_specific.s_virtual.
1132 s_start_offset) >> 2;
1133 brelse(bh);
1134 }
1135 return 0;
1136}
1137
3fb38dfa
JK		 1138static int udf_load_partdesc(struct super_block *sb, sector_t block)
1139{
1140 struct buffer_head *bh;
1141 struct partitionDesc *p;
1142 struct udf_part_map *map;
1143 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1144 int i, type1_idx;
3fb38dfa
JK		 1145 uint16_t partitionNumber;
1146 uint16_t ident;
1147 int ret = 0;
1148
1149 bh = udf_read_tagged(sb, block, block, &ident);
1150 if (!bh)
1151 return 1;
1152 if (ident != TAG_IDENT_PD)
1153 goto out_bh;
1154
1155 p = (struct partitionDesc *)bh->b_data;
1156 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1157
bfb257a5 1158 /* First scan for TYPE1, SPARABLE and METADATA partitions */
3fb38dfa
JK		 1159 for (i = 0; i < sbi->s_partitions; i++) {
1160 map = &sbi->s_partmaps[i];
1161 udf_debug("Searching map: (%d == %d)\n",
1162 map->s_partition_num, partitionNumber);
38b74a53
JK		 1163 if (map->s_partition_num == partitionNumber &&
1164 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1165 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1166 break;
1167 }
1168
38b74a53 1169 if (i >= sbi->s_partitions) {
3fb38dfa
JK		 1170 udf_debug("Partition (%d) not found in partition map\n",
1171 partitionNumber);
1172 goto out_bh;
1173 }
165923fa 1174
3fb38dfa 1175 ret = udf_fill_partdesc_info(sb, p, i);
38b74a53
JK		 1176
1177 /*
bfb257a5
JK		 1178 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1179 * PHYSICAL partitions are already set up
38b74a53
JK		 1180 */
1181 type1_idx = i;
1182 for (i = 0; i < sbi->s_partitions; i++) {
1183 map = &sbi->s_partmaps[i];
1184
1185 if (map->s_partition_num == partitionNumber &&
1186 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1187 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1188 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1189 break;
1190 }
1191
1192 if (i >= sbi->s_partitions)
1193 goto out_bh;
1194
1195 ret = udf_fill_partdesc_info(sb, p, i);
1196 if (ret)
1197 goto out_bh;
1198
bfb257a5
JK		 1199 if (map->s_partition_type == UDF_METADATA_MAP25) {
1200 ret = udf_load_metadata_files(sb, i);
1201 if (ret) {
1202 printk(KERN_ERR "UDF-fs: error loading MetaData "
1203 "partition map %d\n", i);
1204 goto out_bh;
1205 }
1206 } else {
1207 ret = udf_load_vat(sb, i, type1_idx);
1208 if (ret)
1209 goto out_bh;
1210 /*
1211 * Mark filesystem read-only if we have a partition with
1212 * virtual map since we don't handle writing to it (we
1213 * overwrite blocks instead of relocating them).
1214 */
1215 sb->s_flags |= MS_RDONLY;
1216 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1217 "because writing to pseudooverwrite partition is "
1218 "not implemented.\n");
1219 }
c0eb31ed 1220out_bh:
2e0838fd 1221 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1222 brelse(bh);
1223 return ret;
1da177e4
LT		 1224}
1225
c0eb31ed 1226static int udf_load_logicalvol(struct super_block *sb, sector_t block,
5ca4e4be 1227 struct kernel_lb_addr *fileset)
1da177e4
LT		 1228{
1229 struct logicalVolDesc *lvd;
1230 int i, j, offset;
1231 uint8_t type;
6c79e987 1232 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1233 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1234 uint16_t ident;
1235 struct buffer_head *bh;
1236 int ret = 0;
1da177e4 1237
c0eb31ed
JK		 1238 bh = udf_read_tagged(sb, block, block, &ident);
1239 if (!bh)
1240 return 1;
1241 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4
LT		 1242 lvd = (struct logicalVolDesc *)bh->b_data;
1243
dc5d39be 1244 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
c0eb31ed
JK		 1245 if (i != 0) {
1246 ret = i;
1247 goto out_bh;
1248 }
1da177e4 1249
cb00ea35 1250 for (i = 0, offset = 0;
6c79e987 1251 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
4b11111a
MS		 1252 i++, offset += gpm->partitionMapLength) {
1253 struct udf_part_map *map = &sbi->s_partmaps[i];
1254 gpm = (struct genericPartitionMap *)
1255 &(lvd->partitionMaps[offset]);
1256 type = gpm->partitionMapType;
cb00ea35 1257 if (type == 1) {
4b11111a
MS		 1258 struct genericPartitionMap1 *gpm1 =
1259 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1260 map->s_partition_type = UDF_TYPE1_MAP15;
1261 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1262 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1263 map->s_partition_func = NULL;
cb00ea35 1264 } else if (type == 2) {
4b11111a
MS		 1265 struct udfPartitionMap2 *upm2 =
1266 (struct udfPartitionMap2 *)gpm;
1267 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1268 strlen(UDF_ID_VIRTUAL))) {
1269 u16 suf =
1270 le16_to_cpu(((__le16 *)upm2->partIdent.
1271 identSuffix)[0]);
c82a1275 1272 if (suf < 0x0200) {
4b11111a
MS		 1273 map->s_partition_type =
1274 UDF_VIRTUAL_MAP15;
1275 map->s_partition_func =
1276 udf_get_pblock_virt15;
c82a1275 1277 } else {
4b11111a
MS		 1278 map->s_partition_type =
1279 UDF_VIRTUAL_MAP20;
1280 map->s_partition_func =
1281 udf_get_pblock_virt20;
1da177e4 1282 }
4b11111a
MS		 1283 } else if (!strncmp(upm2->partIdent.ident,
1284 UDF_ID_SPARABLE,
1285 strlen(UDF_ID_SPARABLE))) {
1da177e4 1286 uint32_t loc;
1da177e4 1287 struct sparingTable *st;
4b11111a
MS		 1288 struct sparablePartitionMap *spm =
1289 (struct sparablePartitionMap *)gpm;
28de7948 1290
6c79e987 1291 map->s_partition_type = UDF_SPARABLE_MAP15;
4b11111a
MS		 1292 map->s_type_specific.s_sparing.s_packet_len =
1293 le16_to_cpu(spm->packetLength);
cb00ea35 1294 for (j = 0; j < spm->numSparingTables; j++) {
4b11111a
MS		 1295 struct buffer_head *bh2;
1296
1297 loc = le32_to_cpu(
1298 spm->locSparingTable[j]);
1299 bh2 = udf_read_tagged(sb, loc, loc,
1300 &ident);
1301 map->s_type_specific.s_sparing.
1302 s_spar_map[j] = bh2;
1303
165923fa
MS		 1304 if (bh2 == NULL)
1305 continue;
1306
1307 st = (struct sparingTable *)bh2->b_data;
1308 if (ident != 0 || strncmp(
1309 st->sparingIdent.ident,
1310 UDF_ID_SPARING,
1311 strlen(UDF_ID_SPARING))) {
1312 brelse(bh2);
1313 map->s_type_specific.s_sparing.
1314 s_spar_map[j] = NULL;
1da177e4
LT		 1315 }
1316 }
6c79e987 1317 map->s_partition_func = udf_get_pblock_spar15;
bfb257a5
JK		 1318 } else if (!strncmp(upm2->partIdent.ident,
1319 UDF_ID_METADATA,
1320 strlen(UDF_ID_METADATA))) {
1321 struct udf_meta_data *mdata =
1322 &map->s_type_specific.s_metadata;
1323 struct metadataPartitionMap *mdm =
1324 (struct metadataPartitionMap *)
1325 &(lvd->partitionMaps[offset]);
1326 udf_debug("Parsing Logical vol part %d "
1327 "type %d id=%s\n", i, type,
1328 UDF_ID_METADATA);
1329
1330 map->s_partition_type = UDF_METADATA_MAP25;
1331 map->s_partition_func = udf_get_pblock_meta25;
1332
1333 mdata->s_meta_file_loc =
1334 le32_to_cpu(mdm->metadataFileLoc);
1335 mdata->s_mirror_file_loc =
1336 le32_to_cpu(mdm->metadataMirrorFileLoc);
1337 mdata->s_bitmap_file_loc =
1338 le32_to_cpu(mdm->metadataBitmapFileLoc);
1339 mdata->s_alloc_unit_size =
1340 le32_to_cpu(mdm->allocUnitSize);
1341 mdata->s_align_unit_size =
1342 le16_to_cpu(mdm->alignUnitSize);
1343 mdata->s_dup_md_flag =
1344 mdm->flags & 0x01;
1345
1346 udf_debug("Metadata Ident suffix=0x%x\n",
1347 (le16_to_cpu(
1348 ((__le16 *)
1349 mdm->partIdent.identSuffix)[0])));
1350 udf_debug("Metadata part num=%d\n",
1351 le16_to_cpu(mdm->partitionNum));
1352 udf_debug("Metadata part alloc unit size=%d\n",
1353 le32_to_cpu(mdm->allocUnitSize));
1354 udf_debug("Metadata file loc=%d\n",
1355 le32_to_cpu(mdm->metadataFileLoc));
1356 udf_debug("Mirror file loc=%d\n",
1357 le32_to_cpu(mdm->metadataMirrorFileLoc));
1358 udf_debug("Bitmap file loc=%d\n",
1359 le32_to_cpu(mdm->metadataBitmapFileLoc));
1360 udf_debug("Duplicate Flag: %d %d\n",
1361 mdata->s_dup_md_flag, mdm->flags);
cb00ea35 1362 } else {
3a71fc5d
MS		 1363 udf_debug("Unknown ident: %s\n",
1364 upm2->partIdent.ident);
1da177e4
LT		 1365 continue;
1366 }
6c79e987
MS		 1367 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1368 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4
LT		 1369 }
1370 udf_debug("Partition (%d:%d) type %d on volume %d\n",
6c79e987
MS		 1371 i, map->s_partition_num, type,
1372 map->s_volumeseqnum);
1da177e4
LT		 1373 }
1374
cb00ea35 1375 if (fileset) {
5ca4e4be 1376 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1377
1378 *fileset = lelb_to_cpu(la->extLocation);
3a71fc5d
MS		 1379 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1380 "partition=%d\n", fileset->logicalBlockNum,
28de7948 1381 fileset->partitionReferenceNum);
1da177e4
LT		 1382 }
1383 if (lvd->integritySeqExt.extLength)
1384 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
28de7948 1385
c0eb31ed
JK		 1386out_bh:
1387 brelse(bh);
1388 return ret;
1da177e4
LT		 1389}
1390
1391/*
1392 * udf_load_logicalvolint
1393 *
1394 */
5ca4e4be 1395static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1da177e4
LT		 1396{
1397 struct buffer_head *bh = NULL;
1398 uint16_t ident;
6c79e987
MS		 1399 struct udf_sb_info *sbi = UDF_SB(sb);
1400 struct logicalVolIntegrityDesc *lvid;
1da177e4
LT		 1401
1402 while (loc.extLength > 0 &&
cb00ea35
CG		 1403 (bh = udf_read_tagged(sb, loc.extLocation,
1404 loc.extLocation, &ident)) &&
1405 ident == TAG_IDENT_LVID) {
6c79e987
MS		 1406 sbi->s_lvid_bh = bh;
1407 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
cb00ea35 1408
6c79e987 1409 if (lvid->nextIntegrityExt.extLength)
3a71fc5d 1410 udf_load_logicalvolint(sb,
6c79e987 1411 leea_to_cpu(lvid->nextIntegrityExt));
cb00ea35 1412
6c79e987 1413 if (sbi->s_lvid_bh != bh)
3bf25cb4 1414 brelse(bh);
1da177e4 1415 loc.extLength -= sb->s_blocksize;
cb00ea35 1416 loc.extLocation++;
1da177e4 1417 }
6c79e987 1418 if (sbi->s_lvid_bh != bh)
3bf25cb4 1419 brelse(bh);
1da177e4
LT		 1420}
1421
1422/*
1423 * udf_process_sequence
1424 *
1425 * PURPOSE
1426 * Process a main/reserve volume descriptor sequence.
1427 *
1428 * PRE-CONDITIONS
1429 * sb Pointer to _locked_ superblock.
1430 * block First block of first extent of the sequence.
1431 * lastblock Lastblock of first extent of the sequence.
1432 *
1433 * HISTORY
1434 * July 1, 1997 - Andrew E. Mileski
1435 * Written, tested, and released.
1436 */
200a3592 1437static noinline int udf_process_sequence(struct super_block *sb, long block,
5ca4e4be 1438 long lastblock, struct kernel_lb_addr *fileset)
1da177e4
LT		 1439{
1440 struct buffer_head *bh = NULL;
1441 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1442 struct udf_vds_record *curr;
1da177e4
LT		 1443 struct generic_desc *gd;
1444 struct volDescPtr *vdp;
cb00ea35 1445 int done = 0;
1da177e4
LT		 1446 uint32_t vdsn;
1447 uint16_t ident;
1448 long next_s = 0, next_e = 0;
1449
1450 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1451
c0eb31ed
JK		 1452 /*
1453 * Read the main descriptor sequence and find which descriptors
1454 * are in it.
1455 */
cb00ea35 1456 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1457
1458 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed
JK		 1459 if (!bh) {
1460 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1461 "sequence is corrupted or we could not read "
1462 "it.\n", (unsigned long long)block);
1463 return 1;
1464 }
1da177e4
LT		 1465
1466 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1467 gd = (struct generic_desc *)bh->b_data;
1468 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1469 switch (ident) {
28de7948 1470 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1471 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1472 if (vdsn >= curr->volDescSeqNum) {
1473 curr->volDescSeqNum = vdsn;
1474 curr->block = block;
cb00ea35
CG		 1475 }
1476 break;
28de7948 1477 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
4b11111a
MS		 1478 curr = &vds[VDS_POS_VOL_DESC_PTR];
1479 if (vdsn >= curr->volDescSeqNum) {
1480 curr->volDescSeqNum = vdsn;
1481 curr->block = block;
cb00ea35
CG		 1482
1483 vdp = (struct volDescPtr *)bh->b_data;
4b11111a
MS		 1484 next_s = le32_to_cpu(
1485 vdp->nextVolDescSeqExt.extLocation);
1486 next_e = le32_to_cpu(
1487 vdp->nextVolDescSeqExt.extLength);
cb00ea35
CG		 1488 next_e = next_e >> sb->s_blocksize_bits;
1489 next_e += next_s;
1490 }
1491 break;
28de7948 1492 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1493 curr = &vds[VDS_POS_IMP_USE_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_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1500 curr = &vds[VDS_POS_PARTITION_DESC];
1501 if (!curr->block)
1502 curr->block = block;
cb00ea35 1503 break;
28de7948 1504 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1505 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1506 if (vdsn >= curr->volDescSeqNum) {
1507 curr->volDescSeqNum = vdsn;
1508 curr->block = block;
cb00ea35
CG		 1509 }
1510 break;
28de7948 1511 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1512 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1513 if (vdsn >= curr->volDescSeqNum) {
1514 curr->volDescSeqNum = vdsn;
1515 curr->block = block;
cb00ea35
CG		 1516 }
1517 break;
28de7948 1518 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
cb00ea35
CG		 1519 vds[VDS_POS_TERMINATING_DESC].block = block;
1520 if (next_e) {
1521 block = next_s;
1522 lastblock = next_e;
1523 next_s = next_e = 0;
4b11111a 1524 } else
cb00ea35
CG		 1525 done = 1;
1526 break;
1da177e4 1527 }
3bf25cb4 1528 brelse(bh);
1da177e4 1529 }
c0eb31ed
JK		 1530 /*
1531 * Now read interesting descriptors again and process them
1532 * in a suitable order
1533 */
1534 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1535 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1536 return 1;
1537 }
1538 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1539 return 1;
165923fa 1540
c0eb31ed
JK		 1541 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1542 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1543 return 1;
165923fa 1544
c0eb31ed
JK		 1545 if (vds[VDS_POS_PARTITION_DESC].block) {
1546 /*
1547 * We rescan the whole descriptor sequence to find
1548 * partition descriptor blocks and process them.
1549 */
1550 for (block = vds[VDS_POS_PARTITION_DESC].block;
1551 block < vds[VDS_POS_TERMINATING_DESC].block;
1552 block++)
1553 if (udf_load_partdesc(sb, block))
165923fa 1554 return 1;
1da177e4
LT		 1555 }
1556
1557 return 0;
1558}
1559
40346005
JK		 1560static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1561 struct kernel_lb_addr *fileset)
1da177e4 1562{
40346005
JK		 1563 struct anchorVolDescPtr *anchor;
1564 long main_s, main_e, reserve_s, reserve_e;
1565 struct udf_sb_info *sbi;
1da177e4 1566
40346005
JK		 1567 sbi = UDF_SB(sb);
1568 anchor = (struct anchorVolDescPtr *)bh->b_data;
1569
1570 /* Locate the main sequence */
1571 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1572 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1573 main_e = main_e >> sb->s_blocksize_bits;
1574 main_e += main_s;
1575
1576 /* Locate the reserve sequence */
1577 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1578 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1579 reserve_e = reserve_e >> sb->s_blocksize_bits;
1580 reserve_e += reserve_s;
1581
1582 /* Process the main & reserve sequences */
1583 /* responsible for finding the PartitionDesc(s) */
1584 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1585 return 1;
1586 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1da177e4
LT		 1587}
1588
40346005
JK		 1589/*
1590 * Check whether there is an anchor block in the given block and
1591 * load Volume Descriptor Sequence if so.
1592 */
1593static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1594 struct kernel_lb_addr *fileset)
1197e4df 1595{
40346005
JK		 1596 struct buffer_head *bh;
1597 uint16_t ident;
1598 int ret;
1197e4df 1599
40346005
JK		 1600 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1601 udf_fixed_to_variable(block) >=
1602 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1197e4df 1603 return 0;
40346005
JK		 1604
1605 bh = udf_read_tagged(sb, block, block, &ident);
1606 if (!bh)
1197e4df 1607 return 0;
40346005
JK		 1608 if (ident != TAG_IDENT_AVDP) {
1609 brelse(bh);
1197e4df
CL		 1610 return 0;
1611 }
40346005
JK		 1612 ret = udf_load_sequence(sb, bh, fileset);
1613 brelse(bh);
1614 return ret;
1197e4df
CL		 1615}
1616
40346005
JK		 1617/* Search for an anchor volume descriptor pointer */
1618static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1619 struct kernel_lb_addr *fileset)
1da177e4 1620{
40346005 1621 sector_t last[6];
38b74a53 1622 int i;
40346005
JK		 1623 struct udf_sb_info *sbi = UDF_SB(sb);
1624 int last_count = 0;
1da177e4 1625
40346005
JK		 1626 /* First try user provided anchor */
1627 if (sbi->s_anchor) {
1628 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1629 return lastblock;
1630 }
1631 /*
1632 * according to spec, anchor is in either:
1633 * block 256
1634 * lastblock-256
1635 * lastblock
1636 * however, if the disc isn't closed, it could be 512.
1637 */
1638 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1639 return lastblock;
1640 /*
1641 * The trouble is which block is the last one. Drives often misreport
1642 * this so we try various possibilities.
1643 */
1644 last[last_count++] = lastblock;
1645 if (lastblock >= 1)
1646 last[last_count++] = lastblock - 1;
1647 last[last_count++] = lastblock + 1;
1648 if (lastblock >= 2)
1649 last[last_count++] = lastblock - 2;
1650 if (lastblock >= 150)
1651 last[last_count++] = lastblock - 150;
1652 if (lastblock >= 152)
1653 last[last_count++] = lastblock - 152;
1da177e4 1654
40346005
JK		 1655 for (i = 0; i < last_count; i++) {
1656 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1657 sb->s_blocksize_bits)
28f7c4d4 1658 continue;
40346005
JK		 1659 if (udf_check_anchor_block(sb, last[i], fileset))
1660 return last[i];
1661 if (last[i] < 256)
28f7c4d4 1662 continue;
40346005
JK		 1663 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1664 return last[i];
1665 }
28f7c4d4 1666
40346005
JK		 1667 /* Finally try block 512 in case media is open */
1668 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1669 return last[0];
1670 return 0;
1671}
28f7c4d4 1672
40346005
JK		 1673/*
1674 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1675 * area specified by it. The function expects sbi->s_lastblock to be the last
1676 * block on the media.
1677 *
1678 * Return 1 if ok, 0 if not found.
1679 *
1680 */
1681static int udf_find_anchor(struct super_block *sb,
1682 struct kernel_lb_addr *fileset)
1683{
1684 sector_t lastblock;
1685 struct udf_sb_info *sbi = UDF_SB(sb);
28f7c4d4 1686
40346005
JK		 1687 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1688 if (lastblock)
1689 goto out;
1da177e4 1690
40346005
JK		 1691 /* No anchor found? Try VARCONV conversion of block numbers */
1692 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1693 /* Firstly, we try to not convert number of the last block */
1694 lastblock = udf_scan_anchors(sb,
1695 udf_variable_to_fixed(sbi->s_last_block),
1696 fileset);
1697 if (lastblock)
1698 goto out;
1da177e4 1699
40346005
JK		 1700 /* Secondly, we try with converted number of the last block */
1701 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1702 if (!lastblock) {
1703 /* VARCONV didn't help. Clear it. */
1704 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1705 return 0;
1da177e4 1706 }
40346005
JK		 1707out:
1708 sbi->s_last_block = lastblock;
1709 return 1;
1710}
1da177e4 1711
40346005
JK		 1712/*
1713 * Check Volume Structure Descriptor, find Anchor block and load Volume
1714 * Descriptor Sequence
1715 */
1716static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1717 int silent, struct kernel_lb_addr *fileset)
1718{
1719 struct udf_sb_info *sbi = UDF_SB(sb);
1720 loff_t nsr_off;
1721
1722 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1723 if (!silent)
1724 printk(KERN_WARNING "UDF-fs: Bad block size\n");
1725 return 0;
1726 }
1727 sbi->s_last_block = uopt->lastblock;
1728 if (!uopt->novrs) {
1729 /* Check that it is NSR02 compliant */
1730 nsr_off = udf_check_vsd(sb);
1731 if (!nsr_off) {
1732 if (!silent)
1733 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1734 return 0;
1735 }
1736 if (nsr_off == -1)
1737 udf_debug("Failed to read byte 32768. Assuming open "
1738 "disc. Skipping validity check\n");
1739 if (!sbi->s_last_block)
1740 sbi->s_last_block = udf_get_last_block(sb);
1741 } else {
1742 udf_debug("Validity check skipped because of novrs option\n");
28f7c4d4 1743 }
1da177e4 1744
40346005
JK		 1745 /* Look for anchor block and load Volume Descriptor Sequence */
1746 sbi->s_anchor = uopt->anchor;
1747 if (!udf_find_anchor(sb, fileset)) {
1748 if (!silent)
1749 printk(KERN_WARNING "UDF-fs: No anchor found\n");
1750 return 0;
1751 }
1752 return 1;
1da177e4
LT		 1753}
1754
1755static void udf_open_lvid(struct super_block *sb)
1756{
6c79e987
MS		 1757 struct udf_sb_info *sbi = UDF_SB(sb);
1758 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1759 struct logicalVolIntegrityDesc *lvid;
1760 struct logicalVolIntegrityDescImpUse *lvidiu;
146bca72 1761
165923fa
MS		 1762 if (!bh)
1763 return;
165923fa
MS		 1764 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1765 lvidiu = udf_sb_lvidiu(sbi);
1766
1767 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1768 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1769 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1770 CURRENT_TIME);
146bca72 1771 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
165923fa
MS		 1772
1773 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1774 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1775 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1776
1777 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1778 mark_buffer_dirty(bh);
146bca72 1779 sbi->s_lvid_dirty = 0;
1da177e4
LT		 1780}
1781
1782static void udf_close_lvid(struct super_block *sb)
1783{
6c79e987
MS		 1784 struct udf_sb_info *sbi = UDF_SB(sb);
1785 struct buffer_head *bh = sbi->s_lvid_bh;
1786 struct logicalVolIntegrityDesc *lvid;
165923fa 1787 struct logicalVolIntegrityDescImpUse *lvidiu;
28de7948 1788
6c79e987
MS		 1789 if (!bh)
1790 return;
1791
1792 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
165923fa
MS		 1793 lvidiu = udf_sb_lvidiu(sbi);
1794 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1795 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1796 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1797 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1798 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1799 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1800 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1801 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1802 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1803 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1804
1805 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1806 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1807 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1808
1809 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1810 mark_buffer_dirty(bh);
146bca72 1811 sbi->s_lvid_dirty = 0;
1da177e4
LT		 1812}
1813
66e1da3f
MS		 1814static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1815{
1816 int i;
1817 int nr_groups = bitmap->s_nr_groups;
4b11111a
MS		 1818 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1819 nr_groups);
66e1da3f
MS		 1820
1821 for (i = 0; i < nr_groups; i++)
1822 if (bitmap->s_block_bitmap[i])
1823 brelse(bitmap->s_block_bitmap[i]);
1824
1825 if (size <= PAGE_SIZE)
1826 kfree(bitmap);
1827 else
1828 vfree(bitmap);
1829}
1830
2e0838fd
JK		 1831static void udf_free_partition(struct udf_part_map *map)
1832{
1833 int i;
bfb257a5 1834 struct udf_meta_data *mdata;
2e0838fd
JK		 1835
1836 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1837 iput(map->s_uspace.s_table);
1838 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1839 iput(map->s_fspace.s_table);
1840 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1841 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1842 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1843 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1844 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1845 for (i = 0; i < 4; i++)
1846 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
bfb257a5
JK		 1847 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1848 mdata = &map->s_type_specific.s_metadata;
1849 iput(mdata->s_metadata_fe);
1850 mdata->s_metadata_fe = NULL;
1851
1852 iput(mdata->s_mirror_fe);
1853 mdata->s_mirror_fe = NULL;
1854
1855 iput(mdata->s_bitmap_fe);
1856 mdata->s_bitmap_fe = NULL;
1857 }
2e0838fd
JK		 1858}
1859
1da177e4
LT		 1860static int udf_fill_super(struct super_block *sb, void *options, int silent)
1861{
1862 int i;
40346005 1863 int ret;
cb00ea35 1864 struct inode *inode = NULL;
1da177e4 1865 struct udf_options uopt;
5ca4e4be 1866 struct kernel_lb_addr rootdir, fileset;
1da177e4
LT		 1867 struct udf_sb_info *sbi;
1868
1869 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1870 uopt.uid = -1;
1871 uopt.gid = -1;
1872 uopt.umask = 0;
87bc730c
MS		 1873 uopt.fmode = UDF_INVALID_MODE;
1874 uopt.dmode = UDF_INVALID_MODE;
1da177e4 1875
6c79e987 1876 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1da177e4
LT		 1877 if (!sbi)
1878 return -ENOMEM;
28de7948 1879
1da177e4 1880 sb->s_fs_info = sbi;
1da177e4 1881
1e7933de 1882 mutex_init(&sbi->s_alloc_mutex);
1da177e4 1883
6da80894 1884 if (!udf_parse_options((char *)options, &uopt, false))
1da177e4
LT		 1885 goto error_out;
1886
1887 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 1888 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1da177e4 1889 udf_error(sb, "udf_read_super",
cb00ea35 1890 "utf8 cannot be combined with iocharset\n");
1da177e4
LT		 1891 goto error_out;
1892 }
1893#ifdef CONFIG_UDF_NLS
cb00ea35 1894 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 1895 uopt.nls_map = load_nls_default();
1896 if (!uopt.nls_map)
1897 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1898 else
1899 udf_debug("Using default NLS map\n");
1900 }
1901#endif
1902 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1903 uopt.flags |= (1 << UDF_FLAG_UTF8);
1904
1905 fileset.logicalBlockNum = 0xFFFFFFFF;
1906 fileset.partitionReferenceNum = 0xFFFF;
1907
6c79e987
MS		 1908 sbi->s_flags = uopt.flags;
1909 sbi->s_uid = uopt.uid;
1910 sbi->s_gid = uopt.gid;
1911 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 1912 sbi->s_fmode = uopt.fmode;
1913 sbi->s_dmode = uopt.dmode;
6c79e987 1914 sbi->s_nls_map = uopt.nls_map;
1da177e4 1915
cb00ea35 1916 if (uopt.session == 0xFFFFFFFF)
6c79e987 1917 sbi->s_session = udf_get_last_session(sb);
1da177e4 1918 else
6c79e987 1919 sbi->s_session = uopt.session;
1da177e4 1920
6c79e987 1921 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 1922
40346005
JK		 1923 /* Fill in the rest of the superblock */
1924 sb->s_op = &udf_sb_ops;
1925 sb->s_export_op = &udf_export_ops;
1926 sb->dq_op = NULL;
1927 sb->s_dirt = 0;
1928 sb->s_magic = UDF_SUPER_MAGIC;
1929 sb->s_time_gran = 1000;
1930
1197e4df 1931 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
40346005 1932 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 1933 } else {
e1defc4f 1934 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
40346005
JK		 1935 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1936 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1197e4df
CL		 1937 if (!silent)
1938 printk(KERN_NOTICE
1939 "UDF-fs: Rescanning with blocksize "
1940 "%d\n", UDF_DEFAULT_BLOCKSIZE);
1941 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
40346005 1942 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1197e4df 1943 }
1da177e4 1944 }
40346005 1945 if (!ret) {
3a71fc5d 1946 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1da177e4
LT		 1947 goto error_out;
1948 }
1949
6c79e987 1950 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1da177e4 1951
6c79e987 1952 if (sbi->s_lvid_bh) {
4b11111a
MS		 1953 struct logicalVolIntegrityDescImpUse *lvidiu =
1954 udf_sb_lvidiu(sbi);
6c79e987
MS		 1955 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1956 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
4b11111a
MS		 1957 /* uint16_t maxUDFWriteRev =
1958 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1da177e4 1959
cb00ea35 1960 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
4b11111a
MS		 1961 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1962 "(max is %x)\n",
6c79e987 1963 le16_to_cpu(lvidiu->minUDFReadRev),
cb00ea35 1964 UDF_MAX_READ_VERSION);
1da177e4 1965 goto error_out;
4b11111a 1966 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1da177e4 1967 sb->s_flags |= MS_RDONLY;
1da177e4 1968
6c79e987 1969 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 1970
1971 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1972 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1973 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1974 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1975 }
1976
6c79e987 1977 if (!sbi->s_partitions) {
3a71fc5d 1978 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1da177e4
LT		 1979 goto error_out;
1980 }
1981
4b11111a
MS		 1982 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1983 UDF_PART_FLAG_READ_ONLY) {
1984 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1985 "forcing readonly mount\n");
39b3f6d6 1986 sb->s_flags |= MS_RDONLY;
c1a26e7d 1987 }
39b3f6d6 1988
cb00ea35 1989 if (udf_find_fileset(sb, &fileset, &rootdir)) {
3a71fc5d 1990 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1da177e4
LT		 1991 goto error_out;
1992 }
1993
cb00ea35 1994 if (!silent) {
5ca4e4be 1995 struct timestamp ts;
56774805 1996 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
a9ca6635 1997 udf_info("UDF: Mounting volume '%s', "
28de7948 1998 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
56774805
MS		 1999 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2000 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4
LT		 2001 }
2002 if (!(sb->s_flags & MS_RDONLY))
2003 udf_open_lvid(sb);
2004
2005 /* Assign the root inode */
2006 /* assign inodes by physical block number */
2007 /* perhaps it's not extensible enough, but for now ... */
97e961fd 2008 inode = udf_iget(sb, &rootdir);
cb00ea35 2009 if (!inode) {
4b11111a
MS		 2010 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2011 "partition=%d\n",
cb00ea35 2012 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1da177e4
LT		 2013 goto error_out;
2014 }
2015
2016 /* Allocate a dentry for the root inode */
2017 sb->s_root = d_alloc_root(inode);
cb00ea35 2018 if (!sb->s_root) {
3a71fc5d 2019 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1da177e4
LT		 2020 iput(inode);
2021 goto error_out;
2022 }
31170b6a 2023 sb->s_maxbytes = MAX_LFS_FILESIZE;
1da177e4
LT		 2024 return 0;
2025
28de7948 2026error_out:
6c79e987
MS		 2027 if (sbi->s_vat_inode)
2028 iput(sbi->s_vat_inode);
2e0838fd
JK		 2029 if (sbi->s_partitions)
2030 for (i = 0; i < sbi->s_partitions; i++)
2031 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2032#ifdef CONFIG_UDF_NLS
2033 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2034 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2035#endif
2036 if (!(sb->s_flags & MS_RDONLY))
2037 udf_close_lvid(sb);
6c79e987
MS		 2038 brelse(sbi->s_lvid_bh);
2039
2040 kfree(sbi->s_partmaps);
1da177e4
LT		 2041 kfree(sbi);
2042 sb->s_fs_info = NULL;
28de7948 2043
1da177e4
LT		 2044 return -EINVAL;
2045}
2046
b8145a76
AB		 2047static void udf_error(struct super_block *sb, const char *function,
2048 const char *fmt, ...)
1da177e4
LT		 2049{
2050 va_list args;
2051
cb00ea35 2052 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 2053 /* mark sb error */
2054 sb->s_dirt = 1;
2055 }
2056 va_start(args, fmt);
4a6e617a 2057 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 2058 va_end(args);
3a71fc5d 2059 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
28de7948 2060 sb->s_id, function, error_buf);
1da177e4
LT		 2061}
2062
2063void udf_warning(struct super_block *sb, const char *function,
cb00ea35 2064 const char *fmt, ...)
1da177e4
LT		 2065{
2066 va_list args;
2067
cb00ea35 2068 va_start(args, fmt);
4a6e617a 2069 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4
LT		 2070 va_end(args);
2071 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
cb00ea35 2072 sb->s_id, function, error_buf);
1da177e4
LT		 2073}
2074
cb00ea35 2075static void udf_put_super(struct super_block *sb)
1da177e4
LT		 2076{
2077 int i;
6c79e987 2078 struct udf_sb_info *sbi;
1da177e4 2079
6c79e987 2080 sbi = UDF_SB(sb);
6cfd0148
CH		 2081
2082 lock_kernel();
2083
6c79e987
MS		 2084 if (sbi->s_vat_inode)
2085 iput(sbi->s_vat_inode);
2e0838fd
JK		 2086 if (sbi->s_partitions)
2087 for (i = 0; i < sbi->s_partitions; i++)
2088 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2089#ifdef CONFIG_UDF_NLS
2090 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2091 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2092#endif
2093 if (!(sb->s_flags & MS_RDONLY))
2094 udf_close_lvid(sb);
6c79e987
MS		 2095 brelse(sbi->s_lvid_bh);
2096 kfree(sbi->s_partmaps);
1da177e4
LT		 2097 kfree(sb->s_fs_info);
2098 sb->s_fs_info = NULL;
6cfd0148
CH		 2099
2100 unlock_kernel();
1da177e4
LT		 2101}
2102
146bca72
JK		 2103static int udf_sync_fs(struct super_block *sb, int wait)
2104{
2105 struct udf_sb_info *sbi = UDF_SB(sb);
2106
2107 mutex_lock(&sbi->s_alloc_mutex);
2108 if (sbi->s_lvid_dirty) {
2109 /*
2110 * Blockdevice will be synced later so we don't have to submit
2111 * the buffer for IO
2112 */
2113 mark_buffer_dirty(sbi->s_lvid_bh);
2114 sb->s_dirt = 0;
2115 sbi->s_lvid_dirty = 0;
2116 }
2117 mutex_unlock(&sbi->s_alloc_mutex);
2118
2119 return 0;
2120}
2121
cb00ea35 2122static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 2123{
726c3342 2124 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 2125 struct udf_sb_info *sbi = UDF_SB(sb);
2126 struct logicalVolIntegrityDescImpUse *lvidiu;
557f5a14 2127 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
6c79e987
MS		 2128
2129 if (sbi->s_lvid_bh != NULL)
2130 lvidiu = udf_sb_lvidiu(sbi);
2131 else
2132 lvidiu = NULL;
726c3342 2133
1da177e4
LT		 2134 buf->f_type = UDF_SUPER_MAGIC;
2135 buf->f_bsize = sb->s_blocksize;
6c79e987 2136 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 2137 buf->f_bfree = udf_count_free(sb);
2138 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 2139 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2140 le32_to_cpu(lvidiu->numDirs)) : 0)
2141 + buf->f_bfree;
1da177e4 2142 buf->f_ffree = buf->f_bfree;
cb00ea35 2143 buf->f_namelen = UDF_NAME_LEN - 2;
557f5a14
CL		 2144 buf->f_fsid.val[0] = (u32)id;
2145 buf->f_fsid.val[1] = (u32)(id >> 32);
1da177e4
LT		 2146
2147 return 0;
2148}
2149
4b11111a
MS		 2150static unsigned int udf_count_free_bitmap(struct super_block *sb,
2151 struct udf_bitmap *bitmap)
1da177e4
LT		 2152{
2153 struct buffer_head *bh = NULL;
2154 unsigned int accum = 0;
2155 int index;
2156 int block = 0, newblock;
5ca4e4be 2157 struct kernel_lb_addr loc;
1da177e4 2158 uint32_t bytes;
1da177e4
LT		 2159 uint8_t *ptr;
2160 uint16_t ident;
2161 struct spaceBitmapDesc *bm;
2162
2163 lock_kernel();
2164
2165 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 2166 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
97e961fd 2167 bh = udf_read_ptagged(sb, &loc, 0, &ident);
1da177e4 2168
cb00ea35 2169 if (!bh) {
1da177e4
LT		 2170 printk(KERN_ERR "udf: udf_count_free failed\n");
2171 goto out;
cb00ea35 2172 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 2173 brelse(bh);
1da177e4
LT		 2174 printk(KERN_ERR "udf: udf_count_free failed\n");
2175 goto out;
2176 }
2177
2178 bm = (struct spaceBitmapDesc *)bh->b_data;
2179 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 2180 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2181 ptr = (uint8_t *)bh->b_data;
1da177e4 2182
cb00ea35 2183 while (bytes > 0) {
01b954a3
MS		 2184 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2185 accum += bitmap_weight((const unsigned long *)(ptr + index),
2186 cur_bytes * 8);
2187 bytes -= cur_bytes;
cb00ea35 2188 if (bytes) {
3bf25cb4 2189 brelse(bh);
97e961fd 2190 newblock = udf_get_lb_pblock(sb, &loc, ++block);
1da177e4 2191 bh = udf_tread(sb, newblock);
cb00ea35 2192 if (!bh) {
1da177e4
LT		 2193 udf_debug("read failed\n");
2194 goto out;
2195 }
2196 index = 0;
28de7948 2197 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2198 }
2199 }
3bf25cb4 2200 brelse(bh);
1da177e4 2201
28de7948 2202out:
1da177e4
LT		 2203 unlock_kernel();
2204
2205 return accum;
2206}
2207
4b11111a
MS		 2208static unsigned int udf_count_free_table(struct super_block *sb,
2209 struct inode *table)
1da177e4
LT		 2210{
2211 unsigned int accum = 0;
ff116fc8 2212 uint32_t elen;
5ca4e4be 2213 struct kernel_lb_addr eloc;
1da177e4 2214 int8_t etype;
ff116fc8 2215 struct extent_position epos;
1da177e4
LT		 2216
2217 lock_kernel();
2218
c0b34438 2219 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2220 epos.offset = sizeof(struct unallocSpaceEntry);
2221 epos.bh = NULL;
1da177e4 2222
3a71fc5d 2223 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2224 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2225
3bf25cb4 2226 brelse(epos.bh);
1da177e4
LT		 2227
2228 unlock_kernel();
2229
2230 return accum;
2231}
cb00ea35
CG		 2232
2233static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2234{
2235 unsigned int accum = 0;
6c79e987
MS		 2236 struct udf_sb_info *sbi;
2237 struct udf_part_map *map;
1da177e4 2238
6c79e987
MS		 2239 sbi = UDF_SB(sb);
2240 if (sbi->s_lvid_bh) {
4b11111a
MS		 2241 struct logicalVolIntegrityDesc *lvid =
2242 (struct logicalVolIntegrityDesc *)
2243 sbi->s_lvid_bh->b_data;
6c79e987 2244 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2245 accum = le32_to_cpu(
2246 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2247 if (accum == 0xFFFFFFFF)
2248 accum = 0;
2249 }
2250 }
2251
2252 if (accum)
2253 return accum;
2254
6c79e987
MS		 2255 map = &sbi->s_partmaps[sbi->s_partition];
2256 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2257 accum += udf_count_free_bitmap(sb,
6c79e987 2258 map->s_uspace.s_bitmap);
1da177e4 2259 }
6c79e987 2260 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2261 accum += udf_count_free_bitmap(sb,
6c79e987 2262 map->s_fspace.s_bitmap);
1da177e4
LT		 2263 }
2264 if (accum)
2265 return accum;
2266
6c79e987 2267 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2268 accum += udf_count_free_table(sb,
6c79e987 2269 map->s_uspace.s_table);
1da177e4 2270 }
6c79e987 2271 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2272 accum += udf_count_free_table(sb,
6c79e987 2273 map->s_fspace.s_table);
1da177e4
LT		 2274 }
2275
2276 return accum;
2277}
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