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udf: implement mode and dmode mounting options
[net-next-2.6.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);
5ca4e4be 88static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
1da177e4 89static void udf_find_anchor(struct super_block *);
5ca4e4be
PE		 90static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
91 struct kernel_lb_addr *);
cb00ea35 92static void udf_load_fileset(struct super_block *, struct buffer_head *,
5ca4e4be 93 struct 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
51cc5068 151static void init_once(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;
7ac9bcd5
MS		 204 mode_t fmode;
205 mode_t dmode;
1da177e4
LT		 206 struct nls_table *nls_map;
207};
208
209static int __init init_udf_fs(void)
210{
211 int err;
28de7948 212
1da177e4
LT		 213 err = init_inodecache();
214 if (err)
215 goto out1;
216 err = register_filesystem(&udf_fstype);
217 if (err)
218 goto out;
28de7948 219
1da177e4 220 return 0;
28de7948
CG		 221
222out:
1da177e4 223 destroy_inodecache();
28de7948
CG		 224
225out1:
1da177e4
LT		 226 return err;
227}
228
229static void __exit exit_udf_fs(void)
230{
231 unregister_filesystem(&udf_fstype);
232 destroy_inodecache();
233}
234
235module_init(init_udf_fs)
28de7948 236module_exit(exit_udf_fs)
1da177e4 237
dc5d39be
MS		 238static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
239{
240 struct udf_sb_info *sbi = UDF_SB(sb);
241
242 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
243 GFP_KERNEL);
244 if (!sbi->s_partmaps) {
8e24eea7 245 udf_error(sb, __func__,
dc5d39be
MS		 246 "Unable to allocate space for %d partition maps",
247 count);
248 sbi->s_partitions = 0;
249 return -ENOMEM;
250 }
251
252 sbi->s_partitions = count;
253 return 0;
254}
255
6da80894
MS		 256static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
257{
258 struct super_block *sb = mnt->mnt_sb;
259 struct udf_sb_info *sbi = UDF_SB(sb);
260
261 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
262 seq_puts(seq, ",nostrict");
263 if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
264 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
265 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
266 seq_puts(seq, ",unhide");
267 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
268 seq_puts(seq, ",undelete");
269 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
270 seq_puts(seq, ",noadinicb");
271 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
272 seq_puts(seq, ",shortad");
273 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
274 seq_puts(seq, ",uid=forget");
275 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
276 seq_puts(seq, ",uid=ignore");
277 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
278 seq_puts(seq, ",gid=forget");
279 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
280 seq_puts(seq, ",gid=ignore");
281 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
282 seq_printf(seq, ",uid=%u", sbi->s_uid);
283 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
284 seq_printf(seq, ",gid=%u", sbi->s_gid);
285 if (sbi->s_umask != 0)
286 seq_printf(seq, ",umask=%o", sbi->s_umask);
7ac9bcd5
MS		 287 if (sbi->s_fmode != -1)
288 seq_printf(seq, ",mode=%o", sbi->s_fmode);
289 if (sbi->s_dmode != -1)
290 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
6da80894
MS		 291 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
292 seq_printf(seq, ",session=%u", sbi->s_session);
293 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
294 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
295 /*
296 * s_anchor[2] could be zeroed out in case there is no anchor
297 * in the specified block, but then the "anchor=N" option
298 * originally given by the user wasn't effective, so it's OK
299 * if we don't show it.
300 */
301 if (sbi->s_anchor[2] != 0)
302 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
303 /*
304 * volume, partition, fileset and rootdir seem to be ignored
305 * currently
306 */
307 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
308 seq_puts(seq, ",utf8");
309 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
310 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
311
312 return 0;
313}
314
1da177e4
LT		 315/*
316 * udf_parse_options
317 *
318 * PURPOSE
319 * Parse mount options.
320 *
321 * DESCRIPTION
322 * The following mount options are supported:
323 *
324 * gid= Set the default group.
325 * umask= Set the default umask.
7ac9bcd5
MS		 326 * mode= Set the default file permissions.
327 * dmode= Set the default directory permissions.
1da177e4
LT		 328 * uid= Set the default user.
329 * bs= Set the block size.
330 * unhide Show otherwise hidden files.
331 * undelete Show deleted files in lists.
332 * adinicb Embed data in the inode (default)
333 * noadinicb Don't embed data in the inode
334 * shortad Use short ad's
335 * longad Use long ad's (default)
336 * nostrict Unset strict conformance
337 * iocharset= Set the NLS character set
338 *
339 * The remaining are for debugging and disaster recovery:
340 *
28de7948 341 * novrs Skip volume sequence recognition
1da177e4
LT		 342 *
343 * The following expect a offset from 0.
344 *
345 * session= Set the CDROM session (default= last session)
346 * anchor= Override standard anchor location. (default= 256)
347 * volume= Override the VolumeDesc location. (unused)
348 * partition= Override the PartitionDesc location. (unused)
349 * lastblock= Set the last block of the filesystem/
350 *
351 * The following expect a offset from the partition root.
352 *
353 * fileset= Override the fileset block location. (unused)
354 * rootdir= Override the root directory location. (unused)
355 * WARNING: overriding the rootdir to a non-directory may
356 * yield highly unpredictable results.
357 *
358 * PRE-CONDITIONS
359 * options Pointer to mount options string.
360 * uopts Pointer to mount options variable.
361 *
362 * POST-CONDITIONS
363 * <return> 1 Mount options parsed okay.
364 * <return> 0 Error parsing mount options.
365 *
366 * HISTORY
367 * July 1, 1997 - Andrew E. Mileski
368 * Written, tested, and released.
369 */
28de7948 370
1da177e4
LT		 371enum {
372 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
373 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
374 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
375 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
376 Opt_rootdir, Opt_utf8, Opt_iocharset,
7ac9bcd5
MS		 377 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
378 Opt_fmode, Opt_dmode
1da177e4
LT		 379};
380
a447c093 381static const match_table_t tokens = {
28de7948
CG		 382 {Opt_novrs, "novrs"},
383 {Opt_nostrict, "nostrict"},
384 {Opt_bs, "bs=%u"},
385 {Opt_unhide, "unhide"},
386 {Opt_undelete, "undelete"},
387 {Opt_noadinicb, "noadinicb"},
388 {Opt_adinicb, "adinicb"},
389 {Opt_shortad, "shortad"},
390 {Opt_longad, "longad"},
391 {Opt_uforget, "uid=forget"},
392 {Opt_uignore, "uid=ignore"},
393 {Opt_gforget, "gid=forget"},
394 {Opt_gignore, "gid=ignore"},
395 {Opt_gid, "gid=%u"},
396 {Opt_uid, "uid=%u"},
397 {Opt_umask, "umask=%o"},
398 {Opt_session, "session=%u"},
399 {Opt_lastblock, "lastblock=%u"},
400 {Opt_anchor, "anchor=%u"},
401 {Opt_volume, "volume=%u"},
402 {Opt_partition, "partition=%u"},
403 {Opt_fileset, "fileset=%u"},
404 {Opt_rootdir, "rootdir=%u"},
405 {Opt_utf8, "utf8"},
406 {Opt_iocharset, "iocharset=%s"},
7ac9bcd5
MS		 407 {Opt_fmode, "mode=%o"},
408 {Opt_dmode, "dmode=%o"},
28de7948 409 {Opt_err, NULL}
1da177e4
LT		 410};
411
6da80894
MS		 412static int udf_parse_options(char *options, struct udf_options *uopt,
413 bool remount)
1da177e4
LT		 414{
415 char *p;
416 int option;
417
418 uopt->novrs = 0;
6da80894 419 uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
1da177e4
LT		 420 uopt->partition = 0xFFFF;
421 uopt->session = 0xFFFFFFFF;
422 uopt->lastblock = 0;
423 uopt->anchor = 0;
424 uopt->volume = 0xFFFFFFFF;
425 uopt->rootdir = 0xFFFFFFFF;
426 uopt->fileset = 0xFFFFFFFF;
427 uopt->nls_map = NULL;
428
429 if (!options)
430 return 1;
431
cb00ea35 432 while ((p = strsep(&options, ",")) != NULL) {
1da177e4
LT		 433 substring_t args[MAX_OPT_ARGS];
434 int token;
435 if (!*p)
436 continue;
437
438 token = match_token(p, tokens, args);
cb00ea35
CG		 439 switch (token) {
440 case Opt_novrs:
441 uopt->novrs = 1;
442 case Opt_bs:
443 if (match_int(&args[0], &option))
444 return 0;
445 uopt->blocksize = option;
446 break;
447 case Opt_unhide:
448 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
449 break;
450 case Opt_undelete:
451 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
452 break;
453 case Opt_noadinicb:
454 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
455 break;
456 case Opt_adinicb:
457 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
458 break;
459 case Opt_shortad:
460 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
461 break;
462 case Opt_longad:
463 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
464 break;
465 case Opt_gid:
466 if (match_int(args, &option))
467 return 0;
468 uopt->gid = option;
ca76d2d8 469 uopt->flags |= (1 << UDF_FLAG_GID_SET);
cb00ea35
CG		 470 break;
471 case Opt_uid:
472 if (match_int(args, &option))
473 return 0;
474 uopt->uid = option;
ca76d2d8 475 uopt->flags |= (1 << UDF_FLAG_UID_SET);
cb00ea35
CG		 476 break;
477 case Opt_umask:
478 if (match_octal(args, &option))
479 return 0;
480 uopt->umask = option;
481 break;
482 case Opt_nostrict:
483 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
484 break;
485 case Opt_session:
486 if (match_int(args, &option))
487 return 0;
488 uopt->session = option;
6da80894
MS		 489 if (!remount)
490 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
cb00ea35
CG		 491 break;
492 case Opt_lastblock:
493 if (match_int(args, &option))
494 return 0;
495 uopt->lastblock = option;
6da80894
MS		 496 if (!remount)
497 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
cb00ea35
CG		 498 break;
499 case Opt_anchor:
500 if (match_int(args, &option))
501 return 0;
502 uopt->anchor = option;
503 break;
504 case Opt_volume:
505 if (match_int(args, &option))
506 return 0;
507 uopt->volume = option;
508 break;
509 case Opt_partition:
510 if (match_int(args, &option))
511 return 0;
512 uopt->partition = option;
513 break;
514 case Opt_fileset:
515 if (match_int(args, &option))
516 return 0;
517 uopt->fileset = option;
518 break;
519 case Opt_rootdir:
520 if (match_int(args, &option))
521 return 0;
522 uopt->rootdir = option;
523 break;
524 case Opt_utf8:
525 uopt->flags |= (1 << UDF_FLAG_UTF8);
526 break;
1da177e4 527#ifdef CONFIG_UDF_NLS
cb00ea35
CG		 528 case Opt_iocharset:
529 uopt->nls_map = load_nls(args[0].from);
530 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
531 break;
1da177e4 532#endif
cb00ea35
CG		 533 case Opt_uignore:
534 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
535 break;
536 case Opt_uforget:
537 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
538 break;
539 case Opt_gignore:
540 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
541 break;
542 case Opt_gforget:
543 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
544 break;
7ac9bcd5
MS		 545 case Opt_fmode:
546 if (match_octal(args, &option))
547 return 0;
548 uopt->fmode = option & 0777;
549 break;
550 case Opt_dmode:
551 if (match_octal(args, &option))
552 return 0;
553 uopt->dmode = option & 0777;
554 break;
cb00ea35
CG		 555 default:
556 printk(KERN_ERR "udf: bad mount option \"%s\" "
557 "or missing value\n", p);
1da177e4
LT		 558 return 0;
559 }
560 }
561 return 1;
562}
563
bd45a420 564static void udf_write_super(struct super_block *sb)
1da177e4
LT		 565{
566 lock_kernel();
28de7948 567
1da177e4
LT		 568 if (!(sb->s_flags & MS_RDONLY))
569 udf_open_lvid(sb);
570 sb->s_dirt = 0;
28de7948 571
1da177e4
LT		 572 unlock_kernel();
573}
574
cb00ea35 575static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
1da177e4
LT		 576{
577 struct udf_options uopt;
6c79e987 578 struct udf_sb_info *sbi = UDF_SB(sb);
1da177e4 579
6c79e987
MS		 580 uopt.flags = sbi->s_flags;
581 uopt.uid = sbi->s_uid;
582 uopt.gid = sbi->s_gid;
583 uopt.umask = sbi->s_umask;
7ac9bcd5
MS		 584 uopt.fmode = sbi->s_fmode;
585 uopt.dmode = sbi->s_dmode;
1da177e4 586
6da80894 587 if (!udf_parse_options(options, &uopt, true))
1da177e4
LT		 588 return -EINVAL;
589
6c79e987
MS		 590 sbi->s_flags = uopt.flags;
591 sbi->s_uid = uopt.uid;
592 sbi->s_gid = uopt.gid;
593 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 594 sbi->s_fmode = uopt.fmode;
595 sbi->s_dmode = uopt.dmode;
1da177e4 596
6c79e987
MS		 597 if (sbi->s_lvid_bh) {
598 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
1da177e4
LT		 599 if (write_rev > UDF_MAX_WRITE_VERSION)
600 *flags |= MS_RDONLY;
601 }
602
603 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
604 return 0;
605 if (*flags & MS_RDONLY)
606 udf_close_lvid(sb);
607 else
608 udf_open_lvid(sb);
609
610 return 0;
611}
612
cb00ea35 613static int udf_vrs(struct super_block *sb, int silent)
1da177e4
LT		 614{
615 struct volStructDesc *vsd = NULL;
f4bcbbd9 616 loff_t sector = 32768;
1da177e4
LT		 617 int sectorsize;
618 struct buffer_head *bh = NULL;
cb00ea35
CG		 619 int iso9660 = 0;
620 int nsr02 = 0;
621 int nsr03 = 0;
6c79e987 622 struct udf_sb_info *sbi;
1da177e4
LT		 623
624 /* Block size must be a multiple of 512 */
625 if (sb->s_blocksize & 511)
626 return 0;
6c79e987 627 sbi = UDF_SB(sb);
1da177e4
LT		 628
629 if (sb->s_blocksize < sizeof(struct volStructDesc))
630 sectorsize = sizeof(struct volStructDesc);
631 else
632 sectorsize = sb->s_blocksize;
633
6c79e987 634 sector += (sbi->s_session << sb->s_blocksize_bits);
1da177e4
LT		 635
636 udf_debug("Starting at sector %u (%ld byte sectors)\n",
706047a7
SM		 637 (unsigned int)(sector >> sb->s_blocksize_bits),
638 sb->s_blocksize);
1da177e4 639 /* Process the sequence (if applicable) */
cb00ea35 640 for (; !nsr02 && !nsr03; sector += sectorsize) {
1da177e4
LT		 641 /* Read a block */
642 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
643 if (!bh)
644 break;
645
646 /* Look for ISO descriptors */
647 vsd = (struct volStructDesc *)(bh->b_data +
3a71fc5d 648 (sector & (sb->s_blocksize - 1)));
1da177e4 649
cb00ea35 650 if (vsd->stdIdent[0] == 0) {
3bf25cb4 651 brelse(bh);
1da177e4 652 break;
3a71fc5d
MS		 653 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
654 VSD_STD_ID_LEN)) {
1da177e4 655 iso9660 = sector;
cb00ea35
CG		 656 switch (vsd->structType) {
657 case 0:
658 udf_debug("ISO9660 Boot Record found\n");
659 break;
660 case 1:
3a71fc5d
MS		 661 udf_debug("ISO9660 Primary Volume Descriptor "
662 "found\n");
cb00ea35
CG		 663 break;
664 case 2:
3a71fc5d
MS		 665 udf_debug("ISO9660 Supplementary Volume "
666 "Descriptor found\n");
cb00ea35
CG		 667 break;
668 case 3:
3a71fc5d
MS		 669 udf_debug("ISO9660 Volume Partition Descriptor "
670 "found\n");
cb00ea35
CG		 671 break;
672 case 255:
3a71fc5d
MS		 673 udf_debug("ISO9660 Volume Descriptor Set "
674 "Terminator found\n");
cb00ea35
CG		 675 break;
676 default:
677 udf_debug("ISO9660 VRS (%u) found\n",
678 vsd->structType);
679 break;
1da177e4 680 }
3a71fc5d
MS		 681 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
682 VSD_STD_ID_LEN))
683 ; /* nothing */
684 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
685 VSD_STD_ID_LEN)) {
3bf25cb4 686 brelse(bh);
1da177e4 687 break;
3a71fc5d
MS		 688 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
689 VSD_STD_ID_LEN))
1da177e4 690 nsr02 = sector;
3a71fc5d
MS		 691 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
692 VSD_STD_ID_LEN))
1da177e4 693 nsr03 = sector;
3bf25cb4 694 brelse(bh);
1da177e4
LT		 695 }
696
697 if (nsr03)
698 return nsr03;
699 else if (nsr02)
700 return nsr02;
6c79e987 701 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
1da177e4
LT		 702 return -1;
703 else
704 return 0;
705}
706
707/*
423cf6dc 708 * Check whether there is an anchor block in the given block
1da177e4 709 */
e8183c24 710static int udf_check_anchor_block(struct super_block *sb, sector_t block)
1da177e4 711{
e8183c24 712 struct buffer_head *bh;
1da177e4 713 uint16_t ident;
423cf6dc 714
e8183c24
TJ		 715 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
716 udf_fixed_to_variable(block) >=
717 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
718 return 0;
423cf6dc 719
e8183c24 720 bh = udf_read_tagged(sb, block, block, &ident);
423cf6dc
JK		 721 if (!bh)
722 return 0;
423cf6dc 723 brelse(bh);
e8183c24
TJ		 724
725 return ident == TAG_IDENT_AVDP;
423cf6dc
JK		 726}
727
728/* Search for an anchor volume descriptor pointer */
e8183c24 729static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock)
423cf6dc 730{
5fb28aa2 731 sector_t last[6];
1da177e4 732 int i;
423cf6dc 733 struct udf_sb_info *sbi = UDF_SB(sb);
6c79e987 734
423cf6dc 735 last[0] = lastblock;
5fb28aa2
JK		 736 last[1] = last[0] - 1;
737 last[2] = last[0] + 1;
738 last[3] = last[0] - 2;
739 last[4] = last[0] - 150;
740 last[5] = last[0] - 152;
1da177e4 741
423cf6dc
JK		 742 /* according to spec, anchor is in either:
743 * block 256
744 * lastblock-256
745 * lastblock
746 * however, if the disc isn't closed, it could be 512 */
e8c96f8c 747
423cf6dc
JK		 748 for (i = 0; i < ARRAY_SIZE(last); i++) {
749 if (last[i] < 0)
750 continue;
5fb28aa2
JK		 751 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
752 sb->s_blocksize_bits)
753 continue;
cb00ea35 754
e8183c24 755 if (udf_check_anchor_block(sb, last[i])) {
423cf6dc
JK		 756 sbi->s_anchor[0] = last[i];
757 sbi->s_anchor[1] = last[i] - 256;
758 return last[i];
759 }
cb00ea35 760
423cf6dc
JK		 761 if (last[i] < 256)
762 continue;
763
e8183c24 764 if (udf_check_anchor_block(sb, last[i] - 256)) {
423cf6dc
JK		 765 sbi->s_anchor[1] = last[i] - 256;
766 return last[i];
1da177e4
LT		 767 }
768 }
769
e8183c24 770 if (udf_check_anchor_block(sb, sbi->s_session + 256)) {
423cf6dc
JK		 771 sbi->s_anchor[0] = sbi->s_session + 256;
772 return last[0];
773 }
e8183c24 774 if (udf_check_anchor_block(sb, sbi->s_session + 512)) {
423cf6dc
JK		 775 sbi->s_anchor[0] = sbi->s_session + 512;
776 return last[0];
777 }
778 return 0;
779}
1da177e4 780
423cf6dc
JK		 781/*
782 * Find an anchor volume descriptor. The function expects sbi->s_lastblock to
783 * be the last block on the media.
784 *
785 * Return 1 if not found, 0 if ok
786 *
787 */
788static void udf_find_anchor(struct super_block *sb)
789{
790 sector_t lastblock;
791 struct buffer_head *bh = NULL;
792 uint16_t ident;
793 int i;
794 struct udf_sb_info *sbi = UDF_SB(sb);
795
e8183c24 796 lastblock = udf_scan_anchors(sb, sbi->s_last_block);
423cf6dc
JK		 797 if (lastblock)
798 goto check_anchor;
799
800 /* No anchor found? Try VARCONV conversion of block numbers */
e8183c24 801 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
423cf6dc 802 /* Firstly, we try to not convert number of the last block */
e8183c24 803 lastblock = udf_scan_anchors(sb,
423cf6dc 804 udf_variable_to_fixed(sbi->s_last_block));
e8183c24 805 if (lastblock)
423cf6dc 806 goto check_anchor;
1da177e4 807
423cf6dc 808 /* Secondly, we try with converted number of the last block */
e8183c24
TJ		 809 lastblock = udf_scan_anchors(sb, sbi->s_last_block);
810 if (!lastblock) {
811 /* VARCONV didn't help. Clear it. */
812 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
813 }
423cf6dc
JK		 814
815check_anchor:
816 /*
817 * Check located anchors and the anchor block supplied via
818 * mount options
819 */
6c79e987 820 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
165923fa
MS		 821 if (!sbi->s_anchor[i])
822 continue;
823 bh = udf_read_tagged(sb, sbi->s_anchor[i],
824 sbi->s_anchor[i], &ident);
825 if (!bh)
826 sbi->s_anchor[i] = 0;
827 else {
828 brelse(bh);
423cf6dc 829 if (ident != TAG_IDENT_AVDP)
6c79e987 830 sbi->s_anchor[i] = 0;
1da177e4
LT		 831 }
832 }
833
6c79e987 834 sbi->s_last_block = lastblock;
1da177e4
LT		 835}
836
3a71fc5d 837static int udf_find_fileset(struct super_block *sb,
5ca4e4be
PE		 838 struct kernel_lb_addr *fileset,
839 struct kernel_lb_addr *root)
1da177e4
LT		 840{
841 struct buffer_head *bh = NULL;
842 long lastblock;
843 uint16_t ident;
6c79e987 844 struct udf_sb_info *sbi;
1da177e4
LT		 845
846 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 847 fileset->partitionReferenceNum != 0xFFFF) {
97e961fd 848 bh = udf_read_ptagged(sb, fileset, 0, &ident);
1da177e4 849
28de7948 850 if (!bh) {
1da177e4 851 return 1;
28de7948 852 } else if (ident != TAG_IDENT_FSD) {
3bf25cb4 853 brelse(bh);
1da177e4
LT		 854 return 1;
855 }
cb00ea35 856
1da177e4
LT		 857 }
858
6c79e987 859 sbi = UDF_SB(sb);
3a71fc5d
MS		 860 if (!bh) {
861 /* Search backwards through the partitions */
5ca4e4be 862 struct kernel_lb_addr newfileset;
1da177e4 863
28de7948 864/* --> cvg: FIXME - is it reasonable? */
1da177e4 865 return 1;
cb00ea35 866
6c79e987 867 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
cb00ea35
CG		 868 (newfileset.partitionReferenceNum != 0xFFFF &&
869 fileset->logicalBlockNum == 0xFFFFFFFF &&
870 fileset->partitionReferenceNum == 0xFFFF);
871 newfileset.partitionReferenceNum--) {
6c79e987
MS		 872 lastblock = sbi->s_partmaps
873 [newfileset.partitionReferenceNum]
874 .s_partition_len;
1da177e4
LT		 875 newfileset.logicalBlockNum = 0;
876
cb00ea35 877 do {
97e961fd 878 bh = udf_read_ptagged(sb, &newfileset, 0,
3a71fc5d 879 &ident);
cb00ea35
CG		 880 if (!bh) {
881 newfileset.logicalBlockNum++;
1da177e4
LT		 882 continue;
883 }
884
cb00ea35
CG		 885 switch (ident) {
886 case TAG_IDENT_SBD:
28de7948
CG		 887 {
888 struct spaceBitmapDesc *sp;
4b11111a
MS		 889 sp = (struct spaceBitmapDesc *)
890 bh->b_data;
28de7948
CG		 891 newfileset.logicalBlockNum += 1 +
892 ((le32_to_cpu(sp->numOfBytes) +
4b11111a
MS		 893 sizeof(struct spaceBitmapDesc)
894 - 1) >> sb->s_blocksize_bits);
28de7948
CG		 895 brelse(bh);
896 break;
897 }
cb00ea35 898 case TAG_IDENT_FSD:
28de7948
CG		 899 *fileset = newfileset;
900 break;
cb00ea35 901 default:
28de7948
CG		 902 newfileset.logicalBlockNum++;
903 brelse(bh);
904 bh = NULL;
905 break;
1da177e4 906 }
28de7948
CG		 907 } while (newfileset.logicalBlockNum < lastblock &&
908 fileset->logicalBlockNum == 0xFFFFFFFF &&
909 fileset->partitionReferenceNum == 0xFFFF);
1da177e4
LT		 910 }
911 }
912
913 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
cb00ea35 914 fileset->partitionReferenceNum != 0xFFFF) && bh) {
1da177e4 915 udf_debug("Fileset at block=%d, partition=%d\n",
cb00ea35
CG		 916 fileset->logicalBlockNum,
917 fileset->partitionReferenceNum);
1da177e4 918
6c79e987 919 sbi->s_partition = fileset->partitionReferenceNum;
1da177e4 920 udf_load_fileset(sb, bh, root);
3bf25cb4 921 brelse(bh);
1da177e4
LT		 922 return 0;
923 }
924 return 1;
925}
926
c0eb31ed 927static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
1da177e4
LT		 928{
929 struct primaryVolDesc *pvoldesc;
ba9aadd8 930 struct ustr *instr, *outstr;
c0eb31ed
JK		 931 struct buffer_head *bh;
932 uint16_t ident;
ba9aadd8
MS		 933 int ret = 1;
934
935 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
936 if (!instr)
937 return 1;
938
939 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
940 if (!outstr)
941 goto out1;
c0eb31ed
JK		 942
943 bh = udf_read_tagged(sb, block, block, &ident);
944 if (!bh)
ba9aadd8
MS		 945 goto out2;
946
c0eb31ed 947 BUG_ON(ident != TAG_IDENT_PVD);
1da177e4
LT		 948
949 pvoldesc = (struct primaryVolDesc *)bh->b_data;
950
56774805
MS		 951 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
952 pvoldesc->recordingDateAndTime)) {
af15a298 953#ifdef UDFFS_DEBUG
5ca4e4be 954 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
cbf5676a 955 udf_debug("recording time %04u/%02u/%02u"
3a71fc5d 956 " %02u:%02u (%x)\n",
af15a298
MS		 957 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
958 ts->minute, le16_to_cpu(ts->typeAndTimezone));
959#endif
1da177e4
LT		 960 }
961
ba9aadd8
MS		 962 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
963 if (udf_CS0toUTF8(outstr, instr)) {
964 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
965 outstr->u_len > 31 ? 31 : outstr->u_len);
4b11111a
MS		 966 udf_debug("volIdent[] = '%s'\n",
967 UDF_SB(sb)->s_volume_ident);
1da177e4 968 }
1da177e4 969
ba9aadd8
MS		 970 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
971 if (udf_CS0toUTF8(outstr, instr))
972 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
c0eb31ed
JK		 973
974 brelse(bh);
ba9aadd8
MS		 975 ret = 0;
976out2:
977 kfree(outstr);
978out1:
979 kfree(instr);
980 return ret;
1da177e4
LT		 981}
982
bfb257a5
JK		 983static int udf_load_metadata_files(struct super_block *sb, int partition)
984{
985 struct udf_sb_info *sbi = UDF_SB(sb);
986 struct udf_part_map *map;
987 struct udf_meta_data *mdata;
5ca4e4be 988 struct kernel_lb_addr addr;
bfb257a5
JK		 989 int fe_error = 0;
990
991 map = &sbi->s_partmaps[partition];
992 mdata = &map->s_type_specific.s_metadata;
993
994 /* metadata address */
995 addr.logicalBlockNum = mdata->s_meta_file_loc;
996 addr.partitionReferenceNum = map->s_partition_num;
997
998 udf_debug("Metadata file location: block = %d part = %d\n",
999 addr.logicalBlockNum, addr.partitionReferenceNum);
1000
97e961fd 1001 mdata->s_metadata_fe = udf_iget(sb, &addr);
bfb257a5
JK		 1002
1003 if (mdata->s_metadata_fe == NULL) {
1004 udf_warning(sb, __func__, "metadata inode efe not found, "
1005 "will try mirror inode.");
1006 fe_error = 1;
1007 } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
1008 ICBTAG_FLAG_AD_SHORT) {
1009 udf_warning(sb, __func__, "metadata inode efe does not have "
1010 "short allocation descriptors!");
1011 fe_error = 1;
1012 iput(mdata->s_metadata_fe);
1013 mdata->s_metadata_fe = NULL;
1014 }
1015
1016 /* mirror file entry */
1017 addr.logicalBlockNum = mdata->s_mirror_file_loc;
1018 addr.partitionReferenceNum = map->s_partition_num;
1019
1020 udf_debug("Mirror metadata file location: block = %d part = %d\n",
1021 addr.logicalBlockNum, addr.partitionReferenceNum);
1022
97e961fd 1023 mdata->s_mirror_fe = udf_iget(sb, &addr);
bfb257a5
JK		 1024
1025 if (mdata->s_mirror_fe == NULL) {
1026 if (fe_error) {
1027 udf_error(sb, __func__, "mirror inode efe not found "
1028 "and metadata inode is missing too, exiting...");
1029 goto error_exit;
1030 } else
1031 udf_warning(sb, __func__, "mirror inode efe not found,"
1032 " but metadata inode is OK");
1033 } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
1034 ICBTAG_FLAG_AD_SHORT) {
1035 udf_warning(sb, __func__, "mirror inode efe does not have "
1036 "short allocation descriptors!");
1037 iput(mdata->s_mirror_fe);
1038 mdata->s_mirror_fe = NULL;
1039 if (fe_error)
1040 goto error_exit;
1041 }
1042
1043 /*
1044 * bitmap file entry
1045 * Note:
1046 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1047 */
1048 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1049 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1050 addr.partitionReferenceNum = map->s_partition_num;
1051
1052 udf_debug("Bitmap file location: block = %d part = %d\n",
1053 addr.logicalBlockNum, addr.partitionReferenceNum);
1054
97e961fd 1055 mdata->s_bitmap_fe = udf_iget(sb, &addr);
bfb257a5
JK		 1056
1057 if (mdata->s_bitmap_fe == NULL) {
1058 if (sb->s_flags & MS_RDONLY)
1059 udf_warning(sb, __func__, "bitmap inode efe "
1060 "not found but it's ok since the disc"
1061 " is mounted read-only");
1062 else {
1063 udf_error(sb, __func__, "bitmap inode efe not "
1064 "found and attempted read-write mount");
1065 goto error_exit;
1066 }
1067 }
1068 }
1069
1070 udf_debug("udf_load_metadata_files Ok\n");
1071
1072 return 0;
1073
1074error_exit:
1075 return 1;
1076}
1077
28de7948 1078static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
5ca4e4be 1079 struct kernel_lb_addr *root)
1da177e4
LT		 1080{
1081 struct fileSetDesc *fset;
1082
1083 fset = (struct fileSetDesc *)bh->b_data;
1084
1085 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1086
6c79e987 1087 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1da177e4 1088
cb00ea35
CG		 1089 udf_debug("Rootdir at block=%d, partition=%d\n",
1090 root->logicalBlockNum, root->partitionReferenceNum);
1da177e4
LT		 1091}
1092
883cb9d1
MS		 1093int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1094{
1095 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
8dee00bb
JL		 1096 return DIV_ROUND_UP(map->s_partition_len +
1097 (sizeof(struct spaceBitmapDesc) << 3),
1098 sb->s_blocksize * 8);
883cb9d1
MS		 1099}
1100
66e1da3f
MS		 1101static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1102{
66e1da3f
MS		 1103 struct udf_bitmap *bitmap;
1104 int nr_groups;
1105 int size;
1106
883cb9d1 1107 nr_groups = udf_compute_nr_groups(sb, index);
66e1da3f
MS		 1108 size = sizeof(struct udf_bitmap) +
1109 (sizeof(struct buffer_head *) * nr_groups);
1110
1111 if (size <= PAGE_SIZE)
1112 bitmap = kmalloc(size, GFP_KERNEL);
1113 else
1114 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1115
1116 if (bitmap == NULL) {
8e24eea7 1117 udf_error(sb, __func__,
66e1da3f
MS		 1118 "Unable to allocate space for bitmap "
1119 "and %d buffer_head pointers", nr_groups);
1120 return NULL;
1121 }
1122
1123 memset(bitmap, 0x00, size);
1124 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1125 bitmap->s_nr_groups = nr_groups;
1126 return bitmap;
1127}
1128
3fb38dfa
JK		 1129static int udf_fill_partdesc_info(struct super_block *sb,
1130 struct partitionDesc *p, int p_index)
1da177e4 1131{
6c79e987 1132 struct udf_part_map *map;
165923fa 1133 struct udf_sb_info *sbi = UDF_SB(sb);
3fb38dfa 1134 struct partitionHeaderDesc *phd;
165923fa 1135
3fb38dfa 1136 map = &sbi->s_partmaps[p_index];
165923fa
MS		 1137
1138 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1139 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1140
1141 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1142 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1143 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1144 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1145 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1146 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1147 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1148 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1149
706047a7
SM		 1150 udf_debug("Partition (%d type %x) starts at physical %d, "
1151 "block length %d\n", p_index,
165923fa
MS		 1152 map->s_partition_type, map->s_partition_root,
1153 map->s_partition_len);
1154
1155 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1156 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
3fb38dfa 1157 return 0;
165923fa
MS		 1158
1159 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1160 if (phd->unallocSpaceTable.extLength) {
5ca4e4be 1161 struct kernel_lb_addr loc = {
165923fa
MS		 1162 .logicalBlockNum = le32_to_cpu(
1163 phd->unallocSpaceTable.extPosition),
3fb38dfa 1164 .partitionReferenceNum = p_index,
165923fa
MS		 1165 };
1166
97e961fd 1167 map->s_uspace.s_table = udf_iget(sb, &loc);
165923fa
MS		 1168 if (!map->s_uspace.s_table) {
1169 udf_debug("cannot load unallocSpaceTable (part %d)\n",
3fb38dfa
JK		 1170 p_index);
1171 return 1;
165923fa
MS		 1172 }
1173 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1174 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
3fb38dfa 1175 p_index, map->s_uspace.s_table->i_ino);
165923fa
MS		 1176 }
1177
1178 if (phd->unallocSpaceBitmap.extLength) {
3fb38dfa
JK		 1179 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1180 if (!bitmap)
1181 return 1;
165923fa 1182 map->s_uspace.s_bitmap = bitmap;
2e0838fd 1183 bitmap->s_extLength = le32_to_cpu(
165923fa 1184 phd->unallocSpaceBitmap.extLength);
2e0838fd 1185 bitmap->s_extPosition = le32_to_cpu(
165923fa 1186 phd->unallocSpaceBitmap.extPosition);
2e0838fd 1187 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
3fb38dfa 1188 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
2e0838fd 1189 bitmap->s_extPosition);
165923fa
MS		 1190 }
1191
1192 if (phd->partitionIntegrityTable.extLength)
3fb38dfa 1193 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
165923fa
MS		 1194
1195 if (phd->freedSpaceTable.extLength) {
5ca4e4be 1196 struct kernel_lb_addr loc = {
165923fa
MS		 1197 .logicalBlockNum = le32_to_cpu(
1198 phd->freedSpaceTable.extPosition),
3fb38dfa 1199 .partitionReferenceNum = p_index,
165923fa
MS		 1200 };
1201
97e961fd 1202 map->s_fspace.s_table = udf_iget(sb, &loc);
165923fa 1203 if (!map->s_fspace.s_table) {
3fb38dfa
JK		 1204 udf_debug("cannot load freedSpaceTable (part %d)\n",
1205 p_index);
1206 return 1;
165923fa
MS		 1207 }
1208
1209 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1210 udf_debug("freedSpaceTable (part %d) @ %ld\n",
3fb38dfa 1211 p_index, map->s_fspace.s_table->i_ino);
165923fa
MS		 1212 }
1213
1214 if (phd->freedSpaceBitmap.extLength) {
3fb38dfa
JK		 1215 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1216 if (!bitmap)
1217 return 1;
165923fa 1218 map->s_fspace.s_bitmap = bitmap;
2e0838fd 1219 bitmap->s_extLength = le32_to_cpu(
165923fa 1220 phd->freedSpaceBitmap.extLength);
2e0838fd 1221 bitmap->s_extPosition = le32_to_cpu(
165923fa 1222 phd->freedSpaceBitmap.extPosition);
2e0838fd 1223 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
3fb38dfa 1224 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
2e0838fd 1225 bitmap->s_extPosition);
165923fa 1226 }
3fb38dfa
JK		 1227 return 0;
1228}
1229
38b74a53
JK		 1230static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1231{
1232 struct udf_sb_info *sbi = UDF_SB(sb);
1233 struct udf_part_map *map = &sbi->s_partmaps[p_index];
5ca4e4be 1234 struct kernel_lb_addr ino;
fa5e0815
JK		 1235 struct buffer_head *bh = NULL;
1236 struct udf_inode_info *vati;
1237 uint32_t pos;
1238 struct virtualAllocationTable20 *vat20;
38b74a53
JK		 1239
1240 /* VAT file entry is in the last recorded block */
1241 ino.partitionReferenceNum = type1_index;
1242 ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
97e961fd 1243 sbi->s_vat_inode = udf_iget(sb, &ino);
38b74a53
JK		 1244 if (!sbi->s_vat_inode)
1245 return 1;
1246
1247 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
47c9358a 1248 map->s_type_specific.s_virtual.s_start_offset = 0;
38b74a53
JK		 1249 map->s_type_specific.s_virtual.s_num_entries =
1250 (sbi->s_vat_inode->i_size - 36) >> 2;
1251 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
fa5e0815
JK		 1252 vati = UDF_I(sbi->s_vat_inode);
1253 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1254 pos = udf_block_map(sbi->s_vat_inode, 0);
1255 bh = sb_bread(sb, pos);
1256 if (!bh)
1257 return 1;
1258 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1259 } else {
1260 vat20 = (struct virtualAllocationTable20 *)
1261 vati->i_ext.i_data;
1262 }
38b74a53 1263
38b74a53 1264 map->s_type_specific.s_virtual.s_start_offset =
47c9358a 1265 le16_to_cpu(vat20->lengthHeader);
38b74a53
JK		 1266 map->s_type_specific.s_virtual.s_num_entries =
1267 (sbi->s_vat_inode->i_size -
1268 map->s_type_specific.s_virtual.
1269 s_start_offset) >> 2;
1270 brelse(bh);
1271 }
1272 return 0;
1273}
1274
3fb38dfa
JK		 1275static int udf_load_partdesc(struct super_block *sb, sector_t block)
1276{
1277 struct buffer_head *bh;
1278 struct partitionDesc *p;
1279 struct udf_part_map *map;
1280 struct udf_sb_info *sbi = UDF_SB(sb);
38b74a53 1281 int i, type1_idx;
3fb38dfa
JK		 1282 uint16_t partitionNumber;
1283 uint16_t ident;
1284 int ret = 0;
1285
1286 bh = udf_read_tagged(sb, block, block, &ident);
1287 if (!bh)
1288 return 1;
1289 if (ident != TAG_IDENT_PD)
1290 goto out_bh;
1291
1292 p = (struct partitionDesc *)bh->b_data;
1293 partitionNumber = le16_to_cpu(p->partitionNumber);
38b74a53 1294
bfb257a5 1295 /* First scan for TYPE1, SPARABLE and METADATA partitions */
3fb38dfa
JK		 1296 for (i = 0; i < sbi->s_partitions; i++) {
1297 map = &sbi->s_partmaps[i];
1298 udf_debug("Searching map: (%d == %d)\n",
1299 map->s_partition_num, partitionNumber);
38b74a53
JK		 1300 if (map->s_partition_num == partitionNumber &&
1301 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1302 map->s_partition_type == UDF_SPARABLE_MAP15))
3fb38dfa
JK		 1303 break;
1304 }
1305
38b74a53 1306 if (i >= sbi->s_partitions) {
3fb38dfa
JK		 1307 udf_debug("Partition (%d) not found in partition map\n",
1308 partitionNumber);
1309 goto out_bh;
1310 }
165923fa 1311
3fb38dfa 1312 ret = udf_fill_partdesc_info(sb, p, i);
38b74a53
JK		 1313
1314 /*
bfb257a5
JK		 1315 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1316 * PHYSICAL partitions are already set up
38b74a53
JK		 1317 */
1318 type1_idx = i;
1319 for (i = 0; i < sbi->s_partitions; i++) {
1320 map = &sbi->s_partmaps[i];
1321
1322 if (map->s_partition_num == partitionNumber &&
1323 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
bfb257a5
JK		 1324 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1325 map->s_partition_type == UDF_METADATA_MAP25))
38b74a53
JK		 1326 break;
1327 }
1328
1329 if (i >= sbi->s_partitions)
1330 goto out_bh;
1331
1332 ret = udf_fill_partdesc_info(sb, p, i);
1333 if (ret)
1334 goto out_bh;
1335
bfb257a5
JK		 1336 if (map->s_partition_type == UDF_METADATA_MAP25) {
1337 ret = udf_load_metadata_files(sb, i);
1338 if (ret) {
1339 printk(KERN_ERR "UDF-fs: error loading MetaData "
1340 "partition map %d\n", i);
1341 goto out_bh;
1342 }
1343 } else {
1344 ret = udf_load_vat(sb, i, type1_idx);
1345 if (ret)
1346 goto out_bh;
1347 /*
1348 * Mark filesystem read-only if we have a partition with
1349 * virtual map since we don't handle writing to it (we
1350 * overwrite blocks instead of relocating them).
1351 */
1352 sb->s_flags |= MS_RDONLY;
1353 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1354 "because writing to pseudooverwrite partition is "
1355 "not implemented.\n");
1356 }
c0eb31ed 1357out_bh:
2e0838fd 1358 /* In case loading failed, we handle cleanup in udf_fill_super */
c0eb31ed
JK		 1359 brelse(bh);
1360 return ret;
1da177e4
LT		 1361}
1362
c0eb31ed 1363static int udf_load_logicalvol(struct super_block *sb, sector_t block,
5ca4e4be 1364 struct kernel_lb_addr *fileset)
1da177e4
LT		 1365{
1366 struct logicalVolDesc *lvd;
1367 int i, j, offset;
1368 uint8_t type;
6c79e987 1369 struct udf_sb_info *sbi = UDF_SB(sb);
4b11111a 1370 struct genericPartitionMap *gpm;
c0eb31ed
JK		 1371 uint16_t ident;
1372 struct buffer_head *bh;
1373 int ret = 0;
1da177e4 1374
c0eb31ed
JK		 1375 bh = udf_read_tagged(sb, block, block, &ident);
1376 if (!bh)
1377 return 1;
1378 BUG_ON(ident != TAG_IDENT_LVD);
1da177e4
LT		 1379 lvd = (struct logicalVolDesc *)bh->b_data;
1380
dc5d39be 1381 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
c0eb31ed
JK		 1382 if (i != 0) {
1383 ret = i;
1384 goto out_bh;
1385 }
1da177e4 1386
cb00ea35 1387 for (i = 0, offset = 0;
6c79e987 1388 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
4b11111a
MS		 1389 i++, offset += gpm->partitionMapLength) {
1390 struct udf_part_map *map = &sbi->s_partmaps[i];
1391 gpm = (struct genericPartitionMap *)
1392 &(lvd->partitionMaps[offset]);
1393 type = gpm->partitionMapType;
cb00ea35 1394 if (type == 1) {
4b11111a
MS		 1395 struct genericPartitionMap1 *gpm1 =
1396 (struct genericPartitionMap1 *)gpm;
6c79e987
MS		 1397 map->s_partition_type = UDF_TYPE1_MAP15;
1398 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1399 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1400 map->s_partition_func = NULL;
cb00ea35 1401 } else if (type == 2) {
4b11111a
MS		 1402 struct udfPartitionMap2 *upm2 =
1403 (struct udfPartitionMap2 *)gpm;
1404 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1405 strlen(UDF_ID_VIRTUAL))) {
1406 u16 suf =
1407 le16_to_cpu(((__le16 *)upm2->partIdent.
1408 identSuffix)[0]);
c82a1275 1409 if (suf < 0x0200) {
4b11111a
MS		 1410 map->s_partition_type =
1411 UDF_VIRTUAL_MAP15;
1412 map->s_partition_func =
1413 udf_get_pblock_virt15;
c82a1275 1414 } else {
4b11111a
MS		 1415 map->s_partition_type =
1416 UDF_VIRTUAL_MAP20;
1417 map->s_partition_func =
1418 udf_get_pblock_virt20;
1da177e4 1419 }
4b11111a
MS		 1420 } else if (!strncmp(upm2->partIdent.ident,
1421 UDF_ID_SPARABLE,
1422 strlen(UDF_ID_SPARABLE))) {
1da177e4 1423 uint32_t loc;
1da177e4 1424 struct sparingTable *st;
4b11111a
MS		 1425 struct sparablePartitionMap *spm =
1426 (struct sparablePartitionMap *)gpm;
28de7948 1427
6c79e987 1428 map->s_partition_type = UDF_SPARABLE_MAP15;
4b11111a
MS		 1429 map->s_type_specific.s_sparing.s_packet_len =
1430 le16_to_cpu(spm->packetLength);
cb00ea35 1431 for (j = 0; j < spm->numSparingTables; j++) {
4b11111a
MS		 1432 struct buffer_head *bh2;
1433
1434 loc = le32_to_cpu(
1435 spm->locSparingTable[j]);
1436 bh2 = udf_read_tagged(sb, loc, loc,
1437 &ident);
1438 map->s_type_specific.s_sparing.
1439 s_spar_map[j] = bh2;
1440
165923fa
MS		 1441 if (bh2 == NULL)
1442 continue;
1443
1444 st = (struct sparingTable *)bh2->b_data;
1445 if (ident != 0 || strncmp(
1446 st->sparingIdent.ident,
1447 UDF_ID_SPARING,
1448 strlen(UDF_ID_SPARING))) {
1449 brelse(bh2);
1450 map->s_type_specific.s_sparing.
1451 s_spar_map[j] = NULL;
1da177e4
LT		 1452 }
1453 }
6c79e987 1454 map->s_partition_func = udf_get_pblock_spar15;
bfb257a5
JK		 1455 } else if (!strncmp(upm2->partIdent.ident,
1456 UDF_ID_METADATA,
1457 strlen(UDF_ID_METADATA))) {
1458 struct udf_meta_data *mdata =
1459 &map->s_type_specific.s_metadata;
1460 struct metadataPartitionMap *mdm =
1461 (struct metadataPartitionMap *)
1462 &(lvd->partitionMaps[offset]);
1463 udf_debug("Parsing Logical vol part %d "
1464 "type %d id=%s\n", i, type,
1465 UDF_ID_METADATA);
1466
1467 map->s_partition_type = UDF_METADATA_MAP25;
1468 map->s_partition_func = udf_get_pblock_meta25;
1469
1470 mdata->s_meta_file_loc =
1471 le32_to_cpu(mdm->metadataFileLoc);
1472 mdata->s_mirror_file_loc =
1473 le32_to_cpu(mdm->metadataMirrorFileLoc);
1474 mdata->s_bitmap_file_loc =
1475 le32_to_cpu(mdm->metadataBitmapFileLoc);
1476 mdata->s_alloc_unit_size =
1477 le32_to_cpu(mdm->allocUnitSize);
1478 mdata->s_align_unit_size =
1479 le16_to_cpu(mdm->alignUnitSize);
1480 mdata->s_dup_md_flag =
1481 mdm->flags & 0x01;
1482
1483 udf_debug("Metadata Ident suffix=0x%x\n",
1484 (le16_to_cpu(
1485 ((__le16 *)
1486 mdm->partIdent.identSuffix)[0])));
1487 udf_debug("Metadata part num=%d\n",
1488 le16_to_cpu(mdm->partitionNum));
1489 udf_debug("Metadata part alloc unit size=%d\n",
1490 le32_to_cpu(mdm->allocUnitSize));
1491 udf_debug("Metadata file loc=%d\n",
1492 le32_to_cpu(mdm->metadataFileLoc));
1493 udf_debug("Mirror file loc=%d\n",
1494 le32_to_cpu(mdm->metadataMirrorFileLoc));
1495 udf_debug("Bitmap file loc=%d\n",
1496 le32_to_cpu(mdm->metadataBitmapFileLoc));
1497 udf_debug("Duplicate Flag: %d %d\n",
1498 mdata->s_dup_md_flag, mdm->flags);
cb00ea35 1499 } else {
3a71fc5d
MS		 1500 udf_debug("Unknown ident: %s\n",
1501 upm2->partIdent.ident);
1da177e4
LT		 1502 continue;
1503 }
6c79e987
MS		 1504 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1505 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1da177e4
LT		 1506 }
1507 udf_debug("Partition (%d:%d) type %d on volume %d\n",
6c79e987
MS		 1508 i, map->s_partition_num, type,
1509 map->s_volumeseqnum);
1da177e4
LT		 1510 }
1511
cb00ea35 1512 if (fileset) {
5ca4e4be 1513 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1da177e4
LT		 1514
1515 *fileset = lelb_to_cpu(la->extLocation);
3a71fc5d
MS		 1516 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1517 "partition=%d\n", fileset->logicalBlockNum,
28de7948 1518 fileset->partitionReferenceNum);
1da177e4
LT		 1519 }
1520 if (lvd->integritySeqExt.extLength)
1521 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
28de7948 1522
c0eb31ed
JK		 1523out_bh:
1524 brelse(bh);
1525 return ret;
1da177e4
LT		 1526}
1527
1528/*
1529 * udf_load_logicalvolint
1530 *
1531 */
5ca4e4be 1532static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1da177e4
LT		 1533{
1534 struct buffer_head *bh = NULL;
1535 uint16_t ident;
6c79e987
MS		 1536 struct udf_sb_info *sbi = UDF_SB(sb);
1537 struct logicalVolIntegrityDesc *lvid;
1da177e4
LT		 1538
1539 while (loc.extLength > 0 &&
cb00ea35
CG		 1540 (bh = udf_read_tagged(sb, loc.extLocation,
1541 loc.extLocation, &ident)) &&
1542 ident == TAG_IDENT_LVID) {
6c79e987
MS		 1543 sbi->s_lvid_bh = bh;
1544 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
cb00ea35 1545
6c79e987 1546 if (lvid->nextIntegrityExt.extLength)
3a71fc5d 1547 udf_load_logicalvolint(sb,
6c79e987 1548 leea_to_cpu(lvid->nextIntegrityExt));
cb00ea35 1549
6c79e987 1550 if (sbi->s_lvid_bh != bh)
3bf25cb4 1551 brelse(bh);
1da177e4 1552 loc.extLength -= sb->s_blocksize;
cb00ea35 1553 loc.extLocation++;
1da177e4 1554 }
6c79e987 1555 if (sbi->s_lvid_bh != bh)
3bf25cb4 1556 brelse(bh);
1da177e4
LT		 1557}
1558
1559/*
1560 * udf_process_sequence
1561 *
1562 * PURPOSE
1563 * Process a main/reserve volume descriptor sequence.
1564 *
1565 * PRE-CONDITIONS
1566 * sb Pointer to _locked_ superblock.
1567 * block First block of first extent of the sequence.
1568 * lastblock Lastblock of first extent of the sequence.
1569 *
1570 * HISTORY
1571 * July 1, 1997 - Andrew E. Mileski
1572 * Written, tested, and released.
1573 */
200a3592 1574static noinline int udf_process_sequence(struct super_block *sb, long block,
5ca4e4be 1575 long lastblock, struct kernel_lb_addr *fileset)
1da177e4
LT		 1576{
1577 struct buffer_head *bh = NULL;
1578 struct udf_vds_record vds[VDS_POS_LENGTH];
4b11111a 1579 struct udf_vds_record *curr;
1da177e4
LT		 1580 struct generic_desc *gd;
1581 struct volDescPtr *vdp;
cb00ea35 1582 int done = 0;
1da177e4
LT		 1583 uint32_t vdsn;
1584 uint16_t ident;
1585 long next_s = 0, next_e = 0;
1586
1587 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1588
c0eb31ed
JK		 1589 /*
1590 * Read the main descriptor sequence and find which descriptors
1591 * are in it.
1592 */
cb00ea35 1593 for (; (!done && block <= lastblock); block++) {
1da177e4
LT		 1594
1595 bh = udf_read_tagged(sb, block, block, &ident);
c0eb31ed
JK		 1596 if (!bh) {
1597 printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1598 "sequence is corrupted or we could not read "
1599 "it.\n", (unsigned long long)block);
1600 return 1;
1601 }
1da177e4
LT		 1602
1603 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1604 gd = (struct generic_desc *)bh->b_data;
1605 vdsn = le32_to_cpu(gd->volDescSeqNum);
cb00ea35 1606 switch (ident) {
28de7948 1607 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
4b11111a
MS		 1608 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1609 if (vdsn >= curr->volDescSeqNum) {
1610 curr->volDescSeqNum = vdsn;
1611 curr->block = block;
cb00ea35
CG		 1612 }
1613 break;
28de7948 1614 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
4b11111a
MS		 1615 curr = &vds[VDS_POS_VOL_DESC_PTR];
1616 if (vdsn >= curr->volDescSeqNum) {
1617 curr->volDescSeqNum = vdsn;
1618 curr->block = block;
cb00ea35
CG		 1619
1620 vdp = (struct volDescPtr *)bh->b_data;
4b11111a
MS		 1621 next_s = le32_to_cpu(
1622 vdp->nextVolDescSeqExt.extLocation);
1623 next_e = le32_to_cpu(
1624 vdp->nextVolDescSeqExt.extLength);
cb00ea35
CG		 1625 next_e = next_e >> sb->s_blocksize_bits;
1626 next_e += next_s;
1627 }
1628 break;
28de7948 1629 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
4b11111a
MS		 1630 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1631 if (vdsn >= curr->volDescSeqNum) {
1632 curr->volDescSeqNum = vdsn;
1633 curr->block = block;
cb00ea35
CG		 1634 }
1635 break;
28de7948 1636 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
4b11111a
MS		 1637 curr = &vds[VDS_POS_PARTITION_DESC];
1638 if (!curr->block)
1639 curr->block = block;
cb00ea35 1640 break;
28de7948 1641 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
4b11111a
MS		 1642 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1643 if (vdsn >= curr->volDescSeqNum) {
1644 curr->volDescSeqNum = vdsn;
1645 curr->block = block;
cb00ea35
CG		 1646 }
1647 break;
28de7948 1648 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
4b11111a
MS		 1649 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1650 if (vdsn >= curr->volDescSeqNum) {
1651 curr->volDescSeqNum = vdsn;
1652 curr->block = block;
cb00ea35
CG		 1653 }
1654 break;
28de7948 1655 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
cb00ea35
CG		 1656 vds[VDS_POS_TERMINATING_DESC].block = block;
1657 if (next_e) {
1658 block = next_s;
1659 lastblock = next_e;
1660 next_s = next_e = 0;
4b11111a 1661 } else
cb00ea35
CG		 1662 done = 1;
1663 break;
1da177e4 1664 }
3bf25cb4 1665 brelse(bh);
1da177e4 1666 }
c0eb31ed
JK		 1667 /*
1668 * Now read interesting descriptors again and process them
1669 * in a suitable order
1670 */
1671 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1672 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1673 return 1;
1674 }
1675 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1676 return 1;
165923fa 1677
c0eb31ed
JK		 1678 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1679 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1680 return 1;
165923fa 1681
c0eb31ed
JK		 1682 if (vds[VDS_POS_PARTITION_DESC].block) {
1683 /*
1684 * We rescan the whole descriptor sequence to find
1685 * partition descriptor blocks and process them.
1686 */
1687 for (block = vds[VDS_POS_PARTITION_DESC].block;
1688 block < vds[VDS_POS_TERMINATING_DESC].block;
1689 block++)
1690 if (udf_load_partdesc(sb, block))
165923fa 1691 return 1;
1da177e4
LT		 1692 }
1693
1694 return 0;
1695}
1696
1697/*
1698 * udf_check_valid()
1699 */
cb00ea35 1700static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1da177e4
LT		 1701{
1702 long block;
d0db181c 1703 struct udf_sb_info *sbi = UDF_SB(sb);
1da177e4 1704
cb00ea35 1705 if (novrs) {
1da177e4
LT		 1706 udf_debug("Validity check skipped because of novrs option\n");
1707 return 0;
1708 }
1709 /* Check that it is NSR02 compliant */
1710 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
165923fa 1711 block = udf_vrs(sb, silent);
d0db181c
PE		 1712 if (block == -1)
1713 udf_debug("Failed to read byte 32768. Assuming open "
1714 "disc. Skipping validity check\n");
1715 if (block && !sbi->s_last_block)
165923fa 1716 sbi->s_last_block = udf_get_last_block(sb);
d0db181c 1717 return !block;
1da177e4
LT		 1718}
1719
5ca4e4be 1720static int udf_load_sequence(struct super_block *sb, struct kernel_lb_addr *fileset)
1da177e4
LT		 1721{
1722 struct anchorVolDescPtr *anchor;
1723 uint16_t ident;
1724 struct buffer_head *bh;
1725 long main_s, main_e, reserve_s, reserve_e;
38b74a53 1726 int i;
6c79e987 1727 struct udf_sb_info *sbi;
1da177e4
LT		 1728
1729 if (!sb)
1730 return 1;
6c79e987 1731 sbi = UDF_SB(sb);
1da177e4 1732
6c79e987 1733 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
28f7c4d4
MS		 1734 if (!sbi->s_anchor[i])
1735 continue;
165923fa 1736
28f7c4d4
MS		 1737 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1738 &ident);
1739 if (!bh)
1740 continue;
1741
1742 anchor = (struct anchorVolDescPtr *)bh->b_data;
1743
1744 /* Locate the main sequence */
1745 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1746 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1747 main_e = main_e >> sb->s_blocksize_bits;
1748 main_e += main_s;
1749
1750 /* Locate the reserve sequence */
1751 reserve_s = le32_to_cpu(
4b11111a 1752 anchor->reserveVolDescSeqExt.extLocation);
28f7c4d4 1753 reserve_e = le32_to_cpu(
4b11111a 1754 anchor->reserveVolDescSeqExt.extLength);
28f7c4d4
MS		 1755 reserve_e = reserve_e >> sb->s_blocksize_bits;
1756 reserve_e += reserve_s;
1da177e4 1757
28f7c4d4 1758 brelse(bh);
1da177e4 1759
28f7c4d4
MS		 1760 /* Process the main & reserve sequences */
1761 /* responsible for finding the PartitionDesc(s) */
1762 if (!(udf_process_sequence(sb, main_s, main_e,
1763 fileset) &&
1764 udf_process_sequence(sb, reserve_s, reserve_e,
1765 fileset)))
1766 break;
1da177e4
LT		 1767 }
1768
6c79e987 1769 if (i == ARRAY_SIZE(sbi->s_anchor)) {
1da177e4
LT		 1770 udf_debug("No Anchor block found\n");
1771 return 1;
28f7c4d4
MS		 1772 }
1773 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1da177e4 1774
1da177e4
LT		 1775 return 0;
1776}
1777
1778static void udf_open_lvid(struct super_block *sb)
1779{
6c79e987
MS		 1780 struct udf_sb_info *sbi = UDF_SB(sb);
1781 struct buffer_head *bh = sbi->s_lvid_bh;
165923fa
MS		 1782 struct logicalVolIntegrityDesc *lvid;
1783 struct logicalVolIntegrityDescImpUse *lvidiu;
1784 if (!bh)
1785 return;
1786
1787 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1788 lvidiu = udf_sb_lvidiu(sbi);
1789
1790 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1791 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1792 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1793 CURRENT_TIME);
1794 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1795
1796 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1797 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1798 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1799
1800 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1801 mark_buffer_dirty(bh);
1da177e4
LT		 1802}
1803
1804static void udf_close_lvid(struct super_block *sb)
1805{
6c79e987
MS		 1806 struct udf_sb_info *sbi = UDF_SB(sb);
1807 struct buffer_head *bh = sbi->s_lvid_bh;
1808 struct logicalVolIntegrityDesc *lvid;
165923fa 1809 struct logicalVolIntegrityDescImpUse *lvidiu;
28de7948 1810
6c79e987
MS		 1811 if (!bh)
1812 return;
1813
1814 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1815
165923fa
MS		 1816 if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1817 return;
1818
1819 lvidiu = udf_sb_lvidiu(sbi);
1820 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1821 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1822 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1823 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1824 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1825 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1826 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1827 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1828 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1829 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1830
1831 lvid->descTag.descCRC = cpu_to_le16(
5ca4e4be 1832 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
f845fced 1833 le16_to_cpu(lvid->descTag.descCRCLength)));
165923fa
MS		 1834
1835 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1836 mark_buffer_dirty(bh);
1da177e4
LT		 1837}
1838
66e1da3f
MS		 1839static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1840{
1841 int i;
1842 int nr_groups = bitmap->s_nr_groups;
4b11111a
MS		 1843 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1844 nr_groups);
66e1da3f
MS		 1845
1846 for (i = 0; i < nr_groups; i++)
1847 if (bitmap->s_block_bitmap[i])
1848 brelse(bitmap->s_block_bitmap[i]);
1849
1850 if (size <= PAGE_SIZE)
1851 kfree(bitmap);
1852 else
1853 vfree(bitmap);
1854}
1855
2e0838fd
JK		 1856static void udf_free_partition(struct udf_part_map *map)
1857{
1858 int i;
bfb257a5 1859 struct udf_meta_data *mdata;
2e0838fd
JK		 1860
1861 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1862 iput(map->s_uspace.s_table);
1863 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1864 iput(map->s_fspace.s_table);
1865 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1866 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1867 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1868 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1869 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1870 for (i = 0; i < 4; i++)
1871 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
bfb257a5
JK		 1872 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1873 mdata = &map->s_type_specific.s_metadata;
1874 iput(mdata->s_metadata_fe);
1875 mdata->s_metadata_fe = NULL;
1876
1877 iput(mdata->s_mirror_fe);
1878 mdata->s_mirror_fe = NULL;
1879
1880 iput(mdata->s_bitmap_fe);
1881 mdata->s_bitmap_fe = NULL;
1882 }
2e0838fd
JK		 1883}
1884
1da177e4
LT		 1885static int udf_fill_super(struct super_block *sb, void *options, int silent)
1886{
1887 int i;
cb00ea35 1888 struct inode *inode = NULL;
1da177e4 1889 struct udf_options uopt;
5ca4e4be 1890 struct kernel_lb_addr rootdir, fileset;
1da177e4
LT		 1891 struct udf_sb_info *sbi;
1892
1893 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1894 uopt.uid = -1;
1895 uopt.gid = -1;
1896 uopt.umask = 0;
7ac9bcd5
MS		 1897 uopt.fmode = -1;
1898 uopt.dmode = -1;
1da177e4 1899
6c79e987 1900 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1da177e4
LT		 1901 if (!sbi)
1902 return -ENOMEM;
28de7948 1903
1da177e4 1904 sb->s_fs_info = sbi;
1da177e4 1905
1e7933de 1906 mutex_init(&sbi->s_alloc_mutex);
1da177e4 1907
6da80894 1908 if (!udf_parse_options((char *)options, &uopt, false))
1da177e4
LT		 1909 goto error_out;
1910
1911 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
cb00ea35 1912 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1da177e4 1913 udf_error(sb, "udf_read_super",
cb00ea35 1914 "utf8 cannot be combined with iocharset\n");
1da177e4
LT		 1915 goto error_out;
1916 }
1917#ifdef CONFIG_UDF_NLS
cb00ea35 1918 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1da177e4
LT		 1919 uopt.nls_map = load_nls_default();
1920 if (!uopt.nls_map)
1921 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1922 else
1923 udf_debug("Using default NLS map\n");
1924 }
1925#endif
1926 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1927 uopt.flags |= (1 << UDF_FLAG_UTF8);
1928
1929 fileset.logicalBlockNum = 0xFFFFFFFF;
1930 fileset.partitionReferenceNum = 0xFFFF;
1931
6c79e987
MS		 1932 sbi->s_flags = uopt.flags;
1933 sbi->s_uid = uopt.uid;
1934 sbi->s_gid = uopt.gid;
1935 sbi->s_umask = uopt.umask;
7ac9bcd5
MS		 1936 sbi->s_fmode = uopt.fmode;
1937 sbi->s_dmode = uopt.dmode;
6c79e987 1938 sbi->s_nls_map = uopt.nls_map;
1da177e4
LT		 1939
1940 /* Set the block size for all transfers */
f1f73ba8
CH		 1941 if (!sb_min_blocksize(sb, uopt.blocksize)) {
1942 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1943 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1da177e4 1944 goto error_out;
f1f73ba8 1945 }
1da177e4 1946
cb00ea35 1947 if (uopt.session == 0xFFFFFFFF)
6c79e987 1948 sbi->s_session = udf_get_last_session(sb);
1da177e4 1949 else
6c79e987 1950 sbi->s_session = uopt.session;
1da177e4 1951
6c79e987 1952 udf_debug("Multi-session=%d\n", sbi->s_session);
1da177e4 1953
6c79e987
MS		 1954 sbi->s_last_block = uopt.lastblock;
1955 sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1956 sbi->s_anchor[2] = uopt.anchor;
1da177e4 1957
3a71fc5d
MS		 1958 if (udf_check_valid(sb, uopt.novrs, silent)) {
1959 /* read volume recognition sequences */
1960 printk(KERN_WARNING "UDF-fs: No VRS found\n");
cb00ea35 1961 goto error_out;
1da177e4
LT		 1962 }
1963
1964 udf_find_anchor(sb);
1965
1966 /* Fill in the rest of the superblock */
1967 sb->s_op = &udf_sb_ops;
221e583a 1968 sb->s_export_op = &udf_export_ops;
1da177e4
LT		 1969 sb->dq_op = NULL;
1970 sb->s_dirt = 0;
1971 sb->s_magic = UDF_SUPER_MAGIC;
1972 sb->s_time_gran = 1000;
1973
38b74a53 1974 if (udf_load_sequence(sb, &fileset)) {
3a71fc5d 1975 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1da177e4
LT		 1976 goto error_out;
1977 }
1978
6c79e987 1979 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1da177e4 1980
6c79e987 1981 if (sbi->s_lvid_bh) {
4b11111a
MS		 1982 struct logicalVolIntegrityDescImpUse *lvidiu =
1983 udf_sb_lvidiu(sbi);
6c79e987
MS		 1984 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1985 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
4b11111a
MS		 1986 /* uint16_t maxUDFWriteRev =
1987 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1da177e4 1988
cb00ea35 1989 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
4b11111a
MS		 1990 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1991 "(max is %x)\n",
6c79e987 1992 le16_to_cpu(lvidiu->minUDFReadRev),
cb00ea35 1993 UDF_MAX_READ_VERSION);
1da177e4 1994 goto error_out;
4b11111a 1995 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1da177e4 1996 sb->s_flags |= MS_RDONLY;
1da177e4 1997
6c79e987 1998 sbi->s_udfrev = minUDFWriteRev;
1da177e4
LT		 1999
2000 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2001 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2002 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2003 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2004 }
2005
6c79e987 2006 if (!sbi->s_partitions) {
3a71fc5d 2007 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1da177e4
LT		 2008 goto error_out;
2009 }
2010
4b11111a
MS		 2011 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2012 UDF_PART_FLAG_READ_ONLY) {
2013 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2014 "forcing readonly mount\n");
39b3f6d6 2015 sb->s_flags |= MS_RDONLY;
c1a26e7d 2016 }
39b3f6d6 2017
cb00ea35 2018 if (udf_find_fileset(sb, &fileset, &rootdir)) {
3a71fc5d 2019 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1da177e4
LT		 2020 goto error_out;
2021 }
2022
cb00ea35 2023 if (!silent) {
5ca4e4be 2024 struct timestamp ts;
56774805 2025 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
a9ca6635 2026 udf_info("UDF: Mounting volume '%s', "
28de7948 2027 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
56774805
MS		 2028 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2029 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1da177e4
LT		 2030 }
2031 if (!(sb->s_flags & MS_RDONLY))
2032 udf_open_lvid(sb);
2033
2034 /* Assign the root inode */
2035 /* assign inodes by physical block number */
2036 /* perhaps it's not extensible enough, but for now ... */
97e961fd 2037 inode = udf_iget(sb, &rootdir);
cb00ea35 2038 if (!inode) {
4b11111a
MS		 2039 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2040 "partition=%d\n",
cb00ea35 2041 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1da177e4
LT		 2042 goto error_out;
2043 }
2044
2045 /* Allocate a dentry for the root inode */
2046 sb->s_root = d_alloc_root(inode);
cb00ea35 2047 if (!sb->s_root) {
3a71fc5d 2048 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1da177e4
LT		 2049 iput(inode);
2050 goto error_out;
2051 }
31170b6a 2052 sb->s_maxbytes = MAX_LFS_FILESIZE;
1da177e4
LT		 2053 return 0;
2054
28de7948 2055error_out:
6c79e987
MS		 2056 if (sbi->s_vat_inode)
2057 iput(sbi->s_vat_inode);
2e0838fd
JK		 2058 if (sbi->s_partitions)
2059 for (i = 0; i < sbi->s_partitions; i++)
2060 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2061#ifdef CONFIG_UDF_NLS
2062 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2063 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2064#endif
2065 if (!(sb->s_flags & MS_RDONLY))
2066 udf_close_lvid(sb);
6c79e987
MS		 2067 brelse(sbi->s_lvid_bh);
2068
2069 kfree(sbi->s_partmaps);
1da177e4
LT		 2070 kfree(sbi);
2071 sb->s_fs_info = NULL;
28de7948 2072
1da177e4
LT		 2073 return -EINVAL;
2074}
2075
b8145a76
AB		 2076static void udf_error(struct super_block *sb, const char *function,
2077 const char *fmt, ...)
1da177e4
LT		 2078{
2079 va_list args;
2080
cb00ea35 2081 if (!(sb->s_flags & MS_RDONLY)) {
1da177e4
LT		 2082 /* mark sb error */
2083 sb->s_dirt = 1;
2084 }
2085 va_start(args, fmt);
4a6e617a 2086 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4 2087 va_end(args);
3a71fc5d 2088 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
28de7948 2089 sb->s_id, function, error_buf);
1da177e4
LT		 2090}
2091
2092void udf_warning(struct super_block *sb, const char *function,
cb00ea35 2093 const char *fmt, ...)
1da177e4
LT		 2094{
2095 va_list args;
2096
cb00ea35 2097 va_start(args, fmt);
4a6e617a 2098 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1da177e4
LT		 2099 va_end(args);
2100 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
cb00ea35 2101 sb->s_id, function, error_buf);
1da177e4
LT		 2102}
2103
cb00ea35 2104static void udf_put_super(struct super_block *sb)
1da177e4
LT		 2105{
2106 int i;
6c79e987 2107 struct udf_sb_info *sbi;
1da177e4 2108
6c79e987
MS		 2109 sbi = UDF_SB(sb);
2110 if (sbi->s_vat_inode)
2111 iput(sbi->s_vat_inode);
2e0838fd
JK		 2112 if (sbi->s_partitions)
2113 for (i = 0; i < sbi->s_partitions; i++)
2114 udf_free_partition(&sbi->s_partmaps[i]);
1da177e4
LT		 2115#ifdef CONFIG_UDF_NLS
2116 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
6c79e987 2117 unload_nls(sbi->s_nls_map);
1da177e4
LT		 2118#endif
2119 if (!(sb->s_flags & MS_RDONLY))
2120 udf_close_lvid(sb);
6c79e987
MS		 2121 brelse(sbi->s_lvid_bh);
2122 kfree(sbi->s_partmaps);
1da177e4
LT		 2123 kfree(sb->s_fs_info);
2124 sb->s_fs_info = NULL;
2125}
2126
cb00ea35 2127static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1da177e4 2128{
726c3342 2129 struct super_block *sb = dentry->d_sb;
6c79e987
MS		 2130 struct udf_sb_info *sbi = UDF_SB(sb);
2131 struct logicalVolIntegrityDescImpUse *lvidiu;
2132
2133 if (sbi->s_lvid_bh != NULL)
2134 lvidiu = udf_sb_lvidiu(sbi);
2135 else
2136 lvidiu = NULL;
726c3342 2137
1da177e4
LT		 2138 buf->f_type = UDF_SUPER_MAGIC;
2139 buf->f_bsize = sb->s_blocksize;
6c79e987 2140 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1da177e4
LT		 2141 buf->f_bfree = udf_count_free(sb);
2142 buf->f_bavail = buf->f_bfree;
6c79e987
MS		 2143 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2144 le32_to_cpu(lvidiu->numDirs)) : 0)
2145 + buf->f_bfree;
1da177e4
LT		 2146 buf->f_ffree = buf->f_bfree;
2147 /* __kernel_fsid_t f_fsid */
cb00ea35 2148 buf->f_namelen = UDF_NAME_LEN - 2;
1da177e4
LT		 2149
2150 return 0;
2151}
2152
4b11111a
MS		 2153static unsigned int udf_count_free_bitmap(struct super_block *sb,
2154 struct udf_bitmap *bitmap)
1da177e4
LT		 2155{
2156 struct buffer_head *bh = NULL;
2157 unsigned int accum = 0;
2158 int index;
2159 int block = 0, newblock;
5ca4e4be 2160 struct kernel_lb_addr loc;
1da177e4 2161 uint32_t bytes;
1da177e4
LT		 2162 uint8_t *ptr;
2163 uint16_t ident;
2164 struct spaceBitmapDesc *bm;
2165
2166 lock_kernel();
2167
2168 loc.logicalBlockNum = bitmap->s_extPosition;
6c79e987 2169 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
97e961fd 2170 bh = udf_read_ptagged(sb, &loc, 0, &ident);
1da177e4 2171
cb00ea35 2172 if (!bh) {
1da177e4
LT		 2173 printk(KERN_ERR "udf: udf_count_free failed\n");
2174 goto out;
cb00ea35 2175 } else if (ident != TAG_IDENT_SBD) {
3bf25cb4 2176 brelse(bh);
1da177e4
LT		 2177 printk(KERN_ERR "udf: udf_count_free failed\n");
2178 goto out;
2179 }
2180
2181 bm = (struct spaceBitmapDesc *)bh->b_data;
2182 bytes = le32_to_cpu(bm->numOfBytes);
28de7948
CG		 2183 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2184 ptr = (uint8_t *)bh->b_data;
1da177e4 2185
cb00ea35 2186 while (bytes > 0) {
01b954a3
MS		 2187 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2188 accum += bitmap_weight((const unsigned long *)(ptr + index),
2189 cur_bytes * 8);
2190 bytes -= cur_bytes;
cb00ea35 2191 if (bytes) {
3bf25cb4 2192 brelse(bh);
97e961fd 2193 newblock = udf_get_lb_pblock(sb, &loc, ++block);
1da177e4 2194 bh = udf_tread(sb, newblock);
cb00ea35 2195 if (!bh) {
1da177e4
LT		 2196 udf_debug("read failed\n");
2197 goto out;
2198 }
2199 index = 0;
28de7948 2200 ptr = (uint8_t *)bh->b_data;
1da177e4
LT		 2201 }
2202 }
3bf25cb4 2203 brelse(bh);
1da177e4 2204
28de7948 2205out:
1da177e4
LT		 2206 unlock_kernel();
2207
2208 return accum;
2209}
2210
4b11111a
MS		 2211static unsigned int udf_count_free_table(struct super_block *sb,
2212 struct inode *table)
1da177e4
LT		 2213{
2214 unsigned int accum = 0;
ff116fc8 2215 uint32_t elen;
5ca4e4be 2216 struct kernel_lb_addr eloc;
1da177e4 2217 int8_t etype;
ff116fc8 2218 struct extent_position epos;
1da177e4
LT		 2219
2220 lock_kernel();
2221
c0b34438 2222 epos.block = UDF_I(table)->i_location;
ff116fc8
JK		 2223 epos.offset = sizeof(struct unallocSpaceEntry);
2224 epos.bh = NULL;
1da177e4 2225
3a71fc5d 2226 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1da177e4 2227 accum += (elen >> table->i_sb->s_blocksize_bits);
3a71fc5d 2228
3bf25cb4 2229 brelse(epos.bh);
1da177e4
LT		 2230
2231 unlock_kernel();
2232
2233 return accum;
2234}
cb00ea35
CG		 2235
2236static unsigned int udf_count_free(struct super_block *sb)
1da177e4
LT		 2237{
2238 unsigned int accum = 0;
6c79e987
MS		 2239 struct udf_sb_info *sbi;
2240 struct udf_part_map *map;
1da177e4 2241
6c79e987
MS		 2242 sbi = UDF_SB(sb);
2243 if (sbi->s_lvid_bh) {
4b11111a
MS		 2244 struct logicalVolIntegrityDesc *lvid =
2245 (struct logicalVolIntegrityDesc *)
2246 sbi->s_lvid_bh->b_data;
6c79e987 2247 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
4b11111a
MS		 2248 accum = le32_to_cpu(
2249 lvid->freeSpaceTable[sbi->s_partition]);
1da177e4
LT		 2250 if (accum == 0xFFFFFFFF)
2251 accum = 0;
2252 }
2253 }
2254
2255 if (accum)
2256 return accum;
2257
6c79e987
MS		 2258 map = &sbi->s_partmaps[sbi->s_partition];
2259 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
28de7948 2260 accum += udf_count_free_bitmap(sb,
6c79e987 2261 map->s_uspace.s_bitmap);
1da177e4 2262 }
6c79e987 2263 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
28de7948 2264 accum += udf_count_free_bitmap(sb,
6c79e987 2265 map->s_fspace.s_bitmap);
1da177e4
LT		 2266 }
2267 if (accum)
2268 return accum;
2269
6c79e987 2270 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
28de7948 2271 accum += udf_count_free_table(sb,
6c79e987 2272 map->s_uspace.s_table);
1da177e4 2273 }
6c79e987 2274 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
28de7948 2275 accum += udf_count_free_table(sb,
6c79e987 2276 map->s_fspace.s_table);
1da177e4
LT		 2277 }
2278
2279 return accum;
2280}
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