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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 * https://www.ecma.ch/
15 * https://www.iso.org/
16 *
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
36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
41#include "udfdecl.h"
42
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/vfs.h>
52#include <linux/vmalloc.h>
53#include <linux/errno.h>
54#include <linux/mount.h>
55#include <linux/seq_file.h>
56#include <linux/bitmap.h>
57#include <linux/crc-itu-t.h>
58#include <linux/log2.h>
59#include <asm/byteorder.h>
60#include <linux/iversion.h>
61
62#include "udf_sb.h"
63#include "udf_i.h"
64
65#include <linux/init.h>
66#include <linux/uaccess.h>
67
68enum {
69 VDS_POS_PRIMARY_VOL_DESC,
70 VDS_POS_UNALLOC_SPACE_DESC,
71 VDS_POS_LOGICAL_VOL_DESC,
72 VDS_POS_IMP_USE_VOL_DESC,
73 VDS_POS_LENGTH
74};
75
76#define VSD_FIRST_SECTOR_OFFSET 32768
77#define VSD_MAX_SECTOR_OFFSET 0x800000
78
79/*
80 * Maximum number of Terminating Descriptor / Logical Volume Integrity
81 * Descriptor redirections. The chosen numbers are arbitrary - just that we
82 * hopefully don't limit any real use of rewritten inode on write-once media
83 * but avoid looping for too long on corrupted media.
84 */
85#define UDF_MAX_TD_NESTING 64
86#define UDF_MAX_LVID_NESTING 1000
87
88enum { UDF_MAX_LINKS = 0xffff };
89
90/* These are the "meat" - everything else is stuffing */
91static int udf_fill_super(struct super_block *, void *, int);
92static void udf_put_super(struct super_block *);
93static int udf_sync_fs(struct super_block *, int);
94static int udf_remount_fs(struct super_block *, int *, char *);
95static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
96static void udf_open_lvid(struct super_block *);
97static void udf_close_lvid(struct super_block *);
98static unsigned int udf_count_free(struct super_block *);
99static int udf_statfs(struct dentry *, struct kstatfs *);
100static int udf_show_options(struct seq_file *, struct dentry *);
101
102struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
103{
104 struct logicalVolIntegrityDesc *lvid;
105 unsigned int partnum;
106 unsigned int offset;
107
108 if (!UDF_SB(sb)->s_lvid_bh)
109 return NULL;
110 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
111 partnum = le32_to_cpu(lvid->numOfPartitions);
112 /* The offset is to skip freeSpaceTable and sizeTable arrays */
113 offset = partnum * 2 * sizeof(uint32_t);
114 return (struct logicalVolIntegrityDescImpUse *)
115 (((uint8_t *)(lvid + 1)) + offset);
116}
117
118/* UDF filesystem type */
119static struct dentry *udf_mount(struct file_system_type *fs_type,
120 int flags, const char *dev_name, void *data)
121{
122 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
123}
124
125static struct file_system_type udf_fstype = {
126 .owner = THIS_MODULE,
127 .name = "udf",
128 .mount = udf_mount,
129 .kill_sb = kill_block_super,
130 .fs_flags = FS_REQUIRES_DEV,
131};
132MODULE_ALIAS_FS("udf");
133
134static struct kmem_cache *udf_inode_cachep;
135
136static struct inode *udf_alloc_inode(struct super_block *sb)
137{
138 struct udf_inode_info *ei;
139 ei = alloc_inode_sb(sb, udf_inode_cachep, GFP_KERNEL);
140 if (!ei)
141 return NULL;
142
143 ei->i_unique = 0;
144 ei->i_lenExtents = 0;
145 ei->i_lenStreams = 0;
146 ei->i_next_alloc_block = 0;
147 ei->i_next_alloc_goal = 0;
148 ei->i_strat4096 = 0;
149 ei->i_streamdir = 0;
150 init_rwsem(&ei->i_data_sem);
151 ei->cached_extent.lstart = -1;
152 spin_lock_init(&ei->i_extent_cache_lock);
153 inode_set_iversion(&ei->vfs_inode, 1);
154
155 return &ei->vfs_inode;
156}
157
158static void udf_free_in_core_inode(struct inode *inode)
159{
160 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
161}
162
163static void init_once(void *foo)
164{
165 struct udf_inode_info *ei = foo;
166
167 ei->i_data = NULL;
168 inode_init_once(&ei->vfs_inode);
169}
170
171static int __init init_inodecache(void)
172{
173 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
174 sizeof(struct udf_inode_info),
175 0, (SLAB_RECLAIM_ACCOUNT |
176 SLAB_MEM_SPREAD |
177 SLAB_ACCOUNT),
178 init_once);
179 if (!udf_inode_cachep)
180 return -ENOMEM;
181 return 0;
182}
183
184static void destroy_inodecache(void)
185{
186 /*
187 * Make sure all delayed rcu free inodes are flushed before we
188 * destroy cache.
189 */
190 rcu_barrier();
191 kmem_cache_destroy(udf_inode_cachep);
192}
193
194/* Superblock operations */
195static const struct super_operations udf_sb_ops = {
196 .alloc_inode = udf_alloc_inode,
197 .free_inode = udf_free_in_core_inode,
198 .write_inode = udf_write_inode,
199 .evict_inode = udf_evict_inode,
200 .put_super = udf_put_super,
201 .sync_fs = udf_sync_fs,
202 .statfs = udf_statfs,
203 .remount_fs = udf_remount_fs,
204 .show_options = udf_show_options,
205};
206
207struct udf_options {
208 unsigned char novrs;
209 unsigned int blocksize;
210 unsigned int session;
211 unsigned int lastblock;
212 unsigned int anchor;
213 unsigned int flags;
214 umode_t umask;
215 kgid_t gid;
216 kuid_t uid;
217 umode_t fmode;
218 umode_t dmode;
219 struct nls_table *nls_map;
220};
221
222static int __init init_udf_fs(void)
223{
224 int err;
225
226 err = init_inodecache();
227 if (err)
228 goto out1;
229 err = register_filesystem(&udf_fstype);
230 if (err)
231 goto out;
232
233 return 0;
234
235out:
236 destroy_inodecache();
237
238out1:
239 return err;
240}
241
242static void __exit exit_udf_fs(void)
243{
244 unregister_filesystem(&udf_fstype);
245 destroy_inodecache();
246}
247
248static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
249{
250 struct udf_sb_info *sbi = UDF_SB(sb);
251
252 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
253 if (!sbi->s_partmaps) {
254 sbi->s_partitions = 0;
255 return -ENOMEM;
256 }
257
258 sbi->s_partitions = count;
259 return 0;
260}
261
262static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
263{
264 int i;
265 int nr_groups = bitmap->s_nr_groups;
266
267 for (i = 0; i < nr_groups; i++)
268 brelse(bitmap->s_block_bitmap[i]);
269
270 kvfree(bitmap);
271}
272
273static void udf_free_partition(struct udf_part_map *map)
274{
275 int i;
276 struct udf_meta_data *mdata;
277
278 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
279 iput(map->s_uspace.s_table);
280 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
281 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
282 if (map->s_partition_type == UDF_SPARABLE_MAP15)
283 for (i = 0; i < 4; i++)
284 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
285 else if (map->s_partition_type == UDF_METADATA_MAP25) {
286 mdata = &map->s_type_specific.s_metadata;
287 iput(mdata->s_metadata_fe);
288 mdata->s_metadata_fe = NULL;
289
290 iput(mdata->s_mirror_fe);
291 mdata->s_mirror_fe = NULL;
292
293 iput(mdata->s_bitmap_fe);
294 mdata->s_bitmap_fe = NULL;
295 }
296}
297
298static void udf_sb_free_partitions(struct super_block *sb)
299{
300 struct udf_sb_info *sbi = UDF_SB(sb);
301 int i;
302
303 if (!sbi->s_partmaps)
304 return;
305 for (i = 0; i < sbi->s_partitions; i++)
306 udf_free_partition(&sbi->s_partmaps[i]);
307 kfree(sbi->s_partmaps);
308 sbi->s_partmaps = NULL;
309}
310
311static int udf_show_options(struct seq_file *seq, struct dentry *root)
312{
313 struct super_block *sb = root->d_sb;
314 struct udf_sb_info *sbi = UDF_SB(sb);
315
316 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
317 seq_puts(seq, ",nostrict");
318 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
319 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
320 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
321 seq_puts(seq, ",unhide");
322 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
323 seq_puts(seq, ",undelete");
324 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
325 seq_puts(seq, ",noadinicb");
326 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
327 seq_puts(seq, ",shortad");
328 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
329 seq_puts(seq, ",uid=forget");
330 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
331 seq_puts(seq, ",gid=forget");
332 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
333 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
334 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
335 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
336 if (sbi->s_umask != 0)
337 seq_printf(seq, ",umask=%ho", sbi->s_umask);
338 if (sbi->s_fmode != UDF_INVALID_MODE)
339 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
340 if (sbi->s_dmode != UDF_INVALID_MODE)
341 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
342 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
343 seq_printf(seq, ",session=%d", sbi->s_session);
344 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
345 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
346 if (sbi->s_anchor != 0)
347 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
348 if (sbi->s_nls_map)
349 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
350 else
351 seq_puts(seq, ",iocharset=utf8");
352
353 return 0;
354}
355
356/*
357 * udf_parse_options
358 *
359 * PURPOSE
360 * Parse mount options.
361 *
362 * DESCRIPTION
363 * The following mount options are supported:
364 *
365 * gid= Set the default group.
366 * umask= Set the default umask.
367 * mode= Set the default file permissions.
368 * dmode= Set the default directory permissions.
369 * uid= Set the default user.
370 * bs= Set the block size.
371 * unhide Show otherwise hidden files.
372 * undelete Show deleted files in lists.
373 * adinicb Embed data in the inode (default)
374 * noadinicb Don't embed data in the inode
375 * shortad Use short ad's
376 * longad Use long ad's (default)
377 * nostrict Unset strict conformance
378 * iocharset= Set the NLS character set
379 *
380 * The remaining are for debugging and disaster recovery:
381 *
382 * novrs Skip volume sequence recognition
383 *
384 * The following expect a offset from 0.
385 *
386 * session= Set the CDROM session (default= last session)
387 * anchor= Override standard anchor location. (default= 256)
388 * volume= Override the VolumeDesc location. (unused)
389 * partition= Override the PartitionDesc location. (unused)
390 * lastblock= Set the last block of the filesystem/
391 *
392 * The following expect a offset from the partition root.
393 *
394 * fileset= Override the fileset block location. (unused)
395 * rootdir= Override the root directory location. (unused)
396 * WARNING: overriding the rootdir to a non-directory may
397 * yield highly unpredictable results.
398 *
399 * PRE-CONDITIONS
400 * options Pointer to mount options string.
401 * uopts Pointer to mount options variable.
402 *
403 * POST-CONDITIONS
404 * <return> 1 Mount options parsed okay.
405 * <return> 0 Error parsing mount options.
406 *
407 * HISTORY
408 * July 1, 1997 - Andrew E. Mileski
409 * Written, tested, and released.
410 */
411
412enum {
413 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
414 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
415 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
416 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
417 Opt_rootdir, Opt_utf8, Opt_iocharset,
418 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
419 Opt_fmode, Opt_dmode
420};
421
422static const match_table_t tokens = {
423 {Opt_novrs, "novrs"},
424 {Opt_nostrict, "nostrict"},
425 {Opt_bs, "bs=%u"},
426 {Opt_unhide, "unhide"},
427 {Opt_undelete, "undelete"},
428 {Opt_noadinicb, "noadinicb"},
429 {Opt_adinicb, "adinicb"},
430 {Opt_shortad, "shortad"},
431 {Opt_longad, "longad"},
432 {Opt_uforget, "uid=forget"},
433 {Opt_uignore, "uid=ignore"},
434 {Opt_gforget, "gid=forget"},
435 {Opt_gignore, "gid=ignore"},
436 {Opt_gid, "gid=%u"},
437 {Opt_uid, "uid=%u"},
438 {Opt_umask, "umask=%o"},
439 {Opt_session, "session=%u"},
440 {Opt_lastblock, "lastblock=%u"},
441 {Opt_anchor, "anchor=%u"},
442 {Opt_volume, "volume=%u"},
443 {Opt_partition, "partition=%u"},
444 {Opt_fileset, "fileset=%u"},
445 {Opt_rootdir, "rootdir=%u"},
446 {Opt_utf8, "utf8"},
447 {Opt_iocharset, "iocharset=%s"},
448 {Opt_fmode, "mode=%o"},
449 {Opt_dmode, "dmode=%o"},
450 {Opt_err, NULL}
451};
452
453static int udf_parse_options(char *options, struct udf_options *uopt,
454 bool remount)
455{
456 char *p;
457 int option;
458 unsigned int uv;
459
460 uopt->novrs = 0;
461 uopt->session = 0xFFFFFFFF;
462 uopt->lastblock = 0;
463 uopt->anchor = 0;
464
465 if (!options)
466 return 1;
467
468 while ((p = strsep(&options, ",")) != NULL) {
469 substring_t args[MAX_OPT_ARGS];
470 int token;
471 unsigned n;
472 if (!*p)
473 continue;
474
475 token = match_token(p, tokens, args);
476 switch (token) {
477 case Opt_novrs:
478 uopt->novrs = 1;
479 break;
480 case Opt_bs:
481 if (match_int(&args[0], &option))
482 return 0;
483 n = option;
484 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
485 return 0;
486 uopt->blocksize = n;
487 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
488 break;
489 case Opt_unhide:
490 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
491 break;
492 case Opt_undelete:
493 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
494 break;
495 case Opt_noadinicb:
496 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
497 break;
498 case Opt_adinicb:
499 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
500 break;
501 case Opt_shortad:
502 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
503 break;
504 case Opt_longad:
505 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
506 break;
507 case Opt_gid:
508 if (match_uint(args, &uv))
509 return 0;
510 uopt->gid = make_kgid(current_user_ns(), uv);
511 if (!gid_valid(uopt->gid))
512 return 0;
513 uopt->flags |= (1 << UDF_FLAG_GID_SET);
514 break;
515 case Opt_uid:
516 if (match_uint(args, &uv))
517 return 0;
518 uopt->uid = make_kuid(current_user_ns(), uv);
519 if (!uid_valid(uopt->uid))
520 return 0;
521 uopt->flags |= (1 << UDF_FLAG_UID_SET);
522 break;
523 case Opt_umask:
524 if (match_octal(args, &option))
525 return 0;
526 uopt->umask = option;
527 break;
528 case Opt_nostrict:
529 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
530 break;
531 case Opt_session:
532 if (match_int(args, &option))
533 return 0;
534 uopt->session = option;
535 if (!remount)
536 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
537 break;
538 case Opt_lastblock:
539 if (match_int(args, &option))
540 return 0;
541 uopt->lastblock = option;
542 if (!remount)
543 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
544 break;
545 case Opt_anchor:
546 if (match_int(args, &option))
547 return 0;
548 uopt->anchor = option;
549 break;
550 case Opt_volume:
551 case Opt_partition:
552 case Opt_fileset:
553 case Opt_rootdir:
554 /* Ignored (never implemented properly) */
555 break;
556 case Opt_utf8:
557 if (!remount) {
558 unload_nls(uopt->nls_map);
559 uopt->nls_map = NULL;
560 }
561 break;
562 case Opt_iocharset:
563 if (!remount) {
564 unload_nls(uopt->nls_map);
565 uopt->nls_map = NULL;
566 }
567 /* When nls_map is not loaded then UTF-8 is used */
568 if (!remount && strcmp(args[0].from, "utf8") != 0) {
569 uopt->nls_map = load_nls(args[0].from);
570 if (!uopt->nls_map) {
571 pr_err("iocharset %s not found\n",
572 args[0].from);
573 return 0;
574 }
575 }
576 break;
577 case Opt_uforget:
578 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
579 break;
580 case Opt_uignore:
581 case Opt_gignore:
582 /* These options are superseeded by uid=<number> */
583 break;
584 case Opt_gforget:
585 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
586 break;
587 case Opt_fmode:
588 if (match_octal(args, &option))
589 return 0;
590 uopt->fmode = option & 0777;
591 break;
592 case Opt_dmode:
593 if (match_octal(args, &option))
594 return 0;
595 uopt->dmode = option & 0777;
596 break;
597 default:
598 pr_err("bad mount option \"%s\" or missing value\n", p);
599 return 0;
600 }
601 }
602 return 1;
603}
604
605static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
606{
607 struct udf_options uopt;
608 struct udf_sb_info *sbi = UDF_SB(sb);
609 int error = 0;
610
611 if (!(*flags & SB_RDONLY) && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
612 return -EACCES;
613
614 sync_filesystem(sb);
615
616 uopt.flags = sbi->s_flags;
617 uopt.uid = sbi->s_uid;
618 uopt.gid = sbi->s_gid;
619 uopt.umask = sbi->s_umask;
620 uopt.fmode = sbi->s_fmode;
621 uopt.dmode = sbi->s_dmode;
622 uopt.nls_map = NULL;
623
624 if (!udf_parse_options(options, &uopt, true))
625 return -EINVAL;
626
627 write_lock(&sbi->s_cred_lock);
628 sbi->s_flags = uopt.flags;
629 sbi->s_uid = uopt.uid;
630 sbi->s_gid = uopt.gid;
631 sbi->s_umask = uopt.umask;
632 sbi->s_fmode = uopt.fmode;
633 sbi->s_dmode = uopt.dmode;
634 write_unlock(&sbi->s_cred_lock);
635
636 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
637 goto out_unlock;
638
639 if (*flags & SB_RDONLY)
640 udf_close_lvid(sb);
641 else
642 udf_open_lvid(sb);
643
644out_unlock:
645 return error;
646}
647
648/*
649 * Check VSD descriptor. Returns -1 in case we are at the end of volume
650 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if
651 * we found one of NSR descriptors we are looking for.
652 */
653static int identify_vsd(const struct volStructDesc *vsd)
654{
655 int ret = 0;
656
657 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
658 switch (vsd->structType) {
659 case 0:
660 udf_debug("ISO9660 Boot Record found\n");
661 break;
662 case 1:
663 udf_debug("ISO9660 Primary Volume Descriptor found\n");
664 break;
665 case 2:
666 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
667 break;
668 case 3:
669 udf_debug("ISO9660 Volume Partition Descriptor found\n");
670 break;
671 case 255:
672 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
673 break;
674 default:
675 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
676 break;
677 }
678 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
679 ; /* ret = 0 */
680 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
681 ret = 1;
682 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
683 ret = 1;
684 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
685 ; /* ret = 0 */
686 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
687 ; /* ret = 0 */
688 else {
689 /* TEA01 or invalid id : end of volume recognition area */
690 ret = -1;
691 }
692
693 return ret;
694}
695
696/*
697 * Check Volume Structure Descriptors (ECMA 167 2/9.1)
698 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
699 * @return 1 if NSR02 or NSR03 found,
700 * -1 if first sector read error, 0 otherwise
701 */
702static int udf_check_vsd(struct super_block *sb)
703{
704 struct volStructDesc *vsd = NULL;
705 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
706 int sectorsize;
707 struct buffer_head *bh = NULL;
708 int nsr = 0;
709 struct udf_sb_info *sbi;
710 loff_t session_offset;
711
712 sbi = UDF_SB(sb);
713 if (sb->s_blocksize < sizeof(struct volStructDesc))
714 sectorsize = sizeof(struct volStructDesc);
715 else
716 sectorsize = sb->s_blocksize;
717
718 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
719 sector += session_offset;
720
721 udf_debug("Starting at sector %u (%lu byte sectors)\n",
722 (unsigned int)(sector >> sb->s_blocksize_bits),
723 sb->s_blocksize);
724 /* Process the sequence (if applicable). The hard limit on the sector
725 * offset is arbitrary, hopefully large enough so that all valid UDF
726 * filesystems will be recognised. There is no mention of an upper
727 * bound to the size of the volume recognition area in the standard.
728 * The limit will prevent the code to read all the sectors of a
729 * specially crafted image (like a bluray disc full of CD001 sectors),
730 * potentially causing minutes or even hours of uninterruptible I/O
731 * activity. This actually happened with uninitialised SSD partitions
732 * (all 0xFF) before the check for the limit and all valid IDs were
733 * added */
734 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
735 /* Read a block */
736 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
737 if (!bh)
738 break;
739
740 vsd = (struct volStructDesc *)(bh->b_data +
741 (sector & (sb->s_blocksize - 1)));
742 nsr = identify_vsd(vsd);
743 /* Found NSR or end? */
744 if (nsr) {
745 brelse(bh);
746 break;
747 }
748 /*
749 * Special handling for improperly formatted VRS (e.g., Win10)
750 * where components are separated by 2048 bytes even though
751 * sectors are 4K
752 */
753 if (sb->s_blocksize == 4096) {
754 nsr = identify_vsd(vsd + 1);
755 /* Ignore unknown IDs... */
756 if (nsr < 0)
757 nsr = 0;
758 }
759 brelse(bh);
760 }
761
762 if (nsr > 0)
763 return 1;
764 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
765 return -1;
766 else
767 return 0;
768}
769
770static int udf_verify_domain_identifier(struct super_block *sb,
771 struct regid *ident, char *dname)
772{
773 struct domainIdentSuffix *suffix;
774
775 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
776 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
777 goto force_ro;
778 }
779 if (ident->flags & ENTITYID_FLAGS_DIRTY) {
780 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
781 dname);
782 goto force_ro;
783 }
784 suffix = (struct domainIdentSuffix *)ident->identSuffix;
785 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
786 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
787 if (!sb_rdonly(sb)) {
788 udf_warn(sb, "Descriptor for %s marked write protected."
789 " Forcing read only mount.\n", dname);
790 }
791 goto force_ro;
792 }
793 return 0;
794
795force_ro:
796 if (!sb_rdonly(sb))
797 return -EACCES;
798 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
799 return 0;
800}
801
802static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
803 struct kernel_lb_addr *root)
804{
805 int ret;
806
807 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
808 if (ret < 0)
809 return ret;
810
811 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
812 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
813
814 udf_debug("Rootdir at block=%u, partition=%u\n",
815 root->logicalBlockNum, root->partitionReferenceNum);
816 return 0;
817}
818
819static int udf_find_fileset(struct super_block *sb,
820 struct kernel_lb_addr *fileset,
821 struct kernel_lb_addr *root)
822{
823 struct buffer_head *bh;
824 uint16_t ident;
825 int ret;
826
827 if (fileset->logicalBlockNum == 0xFFFFFFFF &&
828 fileset->partitionReferenceNum == 0xFFFF)
829 return -EINVAL;
830
831 bh = udf_read_ptagged(sb, fileset, 0, &ident);
832 if (!bh)
833 return -EIO;
834 if (ident != TAG_IDENT_FSD) {
835 brelse(bh);
836 return -EINVAL;
837 }
838
839 udf_debug("Fileset at block=%u, partition=%u\n",
840 fileset->logicalBlockNum, fileset->partitionReferenceNum);
841
842 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
843 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
844 brelse(bh);
845 return ret;
846}
847
848/*
849 * Load primary Volume Descriptor Sequence
850 *
851 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
852 * should be tried.
853 */
854static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
855{
856 struct primaryVolDesc *pvoldesc;
857 uint8_t *outstr;
858 struct buffer_head *bh;
859 uint16_t ident;
860 int ret;
861 struct timestamp *ts;
862
863 outstr = kmalloc(128, GFP_NOFS);
864 if (!outstr)
865 return -ENOMEM;
866
867 bh = udf_read_tagged(sb, block, block, &ident);
868 if (!bh) {
869 ret = -EAGAIN;
870 goto out2;
871 }
872
873 if (ident != TAG_IDENT_PVD) {
874 ret = -EIO;
875 goto out_bh;
876 }
877
878 pvoldesc = (struct primaryVolDesc *)bh->b_data;
879
880 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
881 pvoldesc->recordingDateAndTime);
882 ts = &pvoldesc->recordingDateAndTime;
883 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
884 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
885 ts->minute, le16_to_cpu(ts->typeAndTimezone));
886
887 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
888 if (ret < 0) {
889 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
890 pr_warn("incorrect volume identification, setting to "
891 "'InvalidName'\n");
892 } else {
893 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
894 }
895 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
896
897 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
898 if (ret < 0) {
899 ret = 0;
900 goto out_bh;
901 }
902 outstr[ret] = 0;
903 udf_debug("volSetIdent[] = '%s'\n", outstr);
904
905 ret = 0;
906out_bh:
907 brelse(bh);
908out2:
909 kfree(outstr);
910 return ret;
911}
912
913struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
914 u32 meta_file_loc, u32 partition_ref)
915{
916 struct kernel_lb_addr addr;
917 struct inode *metadata_fe;
918
919 addr.logicalBlockNum = meta_file_loc;
920 addr.partitionReferenceNum = partition_ref;
921
922 metadata_fe = udf_iget_special(sb, &addr);
923
924 if (IS_ERR(metadata_fe)) {
925 udf_warn(sb, "metadata inode efe not found\n");
926 return metadata_fe;
927 }
928 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
929 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
930 iput(metadata_fe);
931 return ERR_PTR(-EIO);
932 }
933
934 return metadata_fe;
935}
936
937static int udf_load_metadata_files(struct super_block *sb, int partition,
938 int type1_index)
939{
940 struct udf_sb_info *sbi = UDF_SB(sb);
941 struct udf_part_map *map;
942 struct udf_meta_data *mdata;
943 struct kernel_lb_addr addr;
944 struct inode *fe;
945
946 map = &sbi->s_partmaps[partition];
947 mdata = &map->s_type_specific.s_metadata;
948 mdata->s_phys_partition_ref = type1_index;
949
950 /* metadata address */
951 udf_debug("Metadata file location: block = %u part = %u\n",
952 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
953
954 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
955 mdata->s_phys_partition_ref);
956 if (IS_ERR(fe)) {
957 /* mirror file entry */
958 udf_debug("Mirror metadata file location: block = %u part = %u\n",
959 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
960
961 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
962 mdata->s_phys_partition_ref);
963
964 if (IS_ERR(fe)) {
965 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
966 return PTR_ERR(fe);
967 }
968 mdata->s_mirror_fe = fe;
969 } else
970 mdata->s_metadata_fe = fe;
971
972
973 /*
974 * bitmap file entry
975 * Note:
976 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
977 */
978 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
979 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
980 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
981
982 udf_debug("Bitmap file location: block = %u part = %u\n",
983 addr.logicalBlockNum, addr.partitionReferenceNum);
984
985 fe = udf_iget_special(sb, &addr);
986 if (IS_ERR(fe)) {
987 if (sb_rdonly(sb))
988 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
989 else {
990 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
991 return PTR_ERR(fe);
992 }
993 } else
994 mdata->s_bitmap_fe = fe;
995 }
996
997 udf_debug("udf_load_metadata_files Ok\n");
998 return 0;
999}
1000
1001int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1002{
1003 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1004 return DIV_ROUND_UP(map->s_partition_len +
1005 (sizeof(struct spaceBitmapDesc) << 3),
1006 sb->s_blocksize * 8);
1007}
1008
1009static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1010{
1011 struct udf_bitmap *bitmap;
1012 int nr_groups = udf_compute_nr_groups(sb, index);
1013
1014 bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
1015 GFP_KERNEL);
1016 if (!bitmap)
1017 return NULL;
1018
1019 bitmap->s_nr_groups = nr_groups;
1020 return bitmap;
1021}
1022
1023static int check_partition_desc(struct super_block *sb,
1024 struct partitionDesc *p,
1025 struct udf_part_map *map)
1026{
1027 bool umap, utable, fmap, ftable;
1028 struct partitionHeaderDesc *phd;
1029
1030 switch (le32_to_cpu(p->accessType)) {
1031 case PD_ACCESS_TYPE_READ_ONLY:
1032 case PD_ACCESS_TYPE_WRITE_ONCE:
1033 case PD_ACCESS_TYPE_NONE:
1034 goto force_ro;
1035 }
1036
1037 /* No Partition Header Descriptor? */
1038 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1039 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1040 goto force_ro;
1041
1042 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1043 utable = phd->unallocSpaceTable.extLength;
1044 umap = phd->unallocSpaceBitmap.extLength;
1045 ftable = phd->freedSpaceTable.extLength;
1046 fmap = phd->freedSpaceBitmap.extLength;
1047
1048 /* No allocation info? */
1049 if (!utable && !umap && !ftable && !fmap)
1050 goto force_ro;
1051
1052 /* We don't support blocks that require erasing before overwrite */
1053 if (ftable || fmap)
1054 goto force_ro;
1055 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1056 if (utable && umap)
1057 goto force_ro;
1058
1059 if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1060 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1061 map->s_partition_type == UDF_METADATA_MAP25)
1062 goto force_ro;
1063
1064 return 0;
1065force_ro:
1066 if (!sb_rdonly(sb))
1067 return -EACCES;
1068 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1069 return 0;
1070}
1071
1072static int udf_fill_partdesc_info(struct super_block *sb,
1073 struct partitionDesc *p, int p_index)
1074{
1075 struct udf_part_map *map;
1076 struct udf_sb_info *sbi = UDF_SB(sb);
1077 struct partitionHeaderDesc *phd;
1078 int err;
1079
1080 map = &sbi->s_partmaps[p_index];
1081
1082 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1083 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1084
1085 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1086 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1087 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1088 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1089 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1090 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1091 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1092 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1093
1094 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1095 p_index, map->s_partition_type,
1096 map->s_partition_root, map->s_partition_len);
1097
1098 err = check_partition_desc(sb, p, map);
1099 if (err)
1100 return err;
1101
1102 /*
1103 * Skip loading allocation info it we cannot ever write to the fs.
1104 * This is a correctness thing as we may have decided to force ro mount
1105 * to avoid allocation info we don't support.
1106 */
1107 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1108 return 0;
1109
1110 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1111 if (phd->unallocSpaceTable.extLength) {
1112 struct kernel_lb_addr loc = {
1113 .logicalBlockNum = le32_to_cpu(
1114 phd->unallocSpaceTable.extPosition),
1115 .partitionReferenceNum = p_index,
1116 };
1117 struct inode *inode;
1118
1119 inode = udf_iget_special(sb, &loc);
1120 if (IS_ERR(inode)) {
1121 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1122 p_index);
1123 return PTR_ERR(inode);
1124 }
1125 map->s_uspace.s_table = inode;
1126 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1127 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1128 p_index, map->s_uspace.s_table->i_ino);
1129 }
1130
1131 if (phd->unallocSpaceBitmap.extLength) {
1132 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1133 if (!bitmap)
1134 return -ENOMEM;
1135 map->s_uspace.s_bitmap = bitmap;
1136 bitmap->s_extPosition = le32_to_cpu(
1137 phd->unallocSpaceBitmap.extPosition);
1138 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1139 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1140 p_index, bitmap->s_extPosition);
1141 }
1142
1143 return 0;
1144}
1145
1146static void udf_find_vat_block(struct super_block *sb, int p_index,
1147 int type1_index, sector_t start_block)
1148{
1149 struct udf_sb_info *sbi = UDF_SB(sb);
1150 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1151 sector_t vat_block;
1152 struct kernel_lb_addr ino;
1153 struct inode *inode;
1154
1155 /*
1156 * VAT file entry is in the last recorded block. Some broken disks have
1157 * it a few blocks before so try a bit harder...
1158 */
1159 ino.partitionReferenceNum = type1_index;
1160 for (vat_block = start_block;
1161 vat_block >= map->s_partition_root &&
1162 vat_block >= start_block - 3; vat_block--) {
1163 ino.logicalBlockNum = vat_block - map->s_partition_root;
1164 inode = udf_iget_special(sb, &ino);
1165 if (!IS_ERR(inode)) {
1166 sbi->s_vat_inode = inode;
1167 break;
1168 }
1169 }
1170}
1171
1172static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1173{
1174 struct udf_sb_info *sbi = UDF_SB(sb);
1175 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1176 struct buffer_head *bh = NULL;
1177 struct udf_inode_info *vati;
1178 uint32_t pos;
1179 struct virtualAllocationTable20 *vat20;
1180 sector_t blocks = sb_bdev_nr_blocks(sb);
1181
1182 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1183 if (!sbi->s_vat_inode &&
1184 sbi->s_last_block != blocks - 1) {
1185 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1186 (unsigned long)sbi->s_last_block,
1187 (unsigned long)blocks - 1);
1188 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1189 }
1190 if (!sbi->s_vat_inode)
1191 return -EIO;
1192
1193 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1194 map->s_type_specific.s_virtual.s_start_offset = 0;
1195 map->s_type_specific.s_virtual.s_num_entries =
1196 (sbi->s_vat_inode->i_size - 36) >> 2;
1197 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1198 vati = UDF_I(sbi->s_vat_inode);
1199 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1200 pos = udf_block_map(sbi->s_vat_inode, 0);
1201 bh = sb_bread(sb, pos);
1202 if (!bh)
1203 return -EIO;
1204 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1205 } else {
1206 vat20 = (struct virtualAllocationTable20 *)
1207 vati->i_data;
1208 }
1209
1210 map->s_type_specific.s_virtual.s_start_offset =
1211 le16_to_cpu(vat20->lengthHeader);
1212 map->s_type_specific.s_virtual.s_num_entries =
1213 (sbi->s_vat_inode->i_size -
1214 map->s_type_specific.s_virtual.
1215 s_start_offset) >> 2;
1216 brelse(bh);
1217 }
1218 return 0;
1219}
1220
1221/*
1222 * Load partition descriptor block
1223 *
1224 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1225 * sequence.
1226 */
1227static int udf_load_partdesc(struct super_block *sb, sector_t block)
1228{
1229 struct buffer_head *bh;
1230 struct partitionDesc *p;
1231 struct udf_part_map *map;
1232 struct udf_sb_info *sbi = UDF_SB(sb);
1233 int i, type1_idx;
1234 uint16_t partitionNumber;
1235 uint16_t ident;
1236 int ret;
1237
1238 bh = udf_read_tagged(sb, block, block, &ident);
1239 if (!bh)
1240 return -EAGAIN;
1241 if (ident != TAG_IDENT_PD) {
1242 ret = 0;
1243 goto out_bh;
1244 }
1245
1246 p = (struct partitionDesc *)bh->b_data;
1247 partitionNumber = le16_to_cpu(p->partitionNumber);
1248
1249 /* First scan for TYPE1 and SPARABLE partitions */
1250 for (i = 0; i < sbi->s_partitions; i++) {
1251 map = &sbi->s_partmaps[i];
1252 udf_debug("Searching map: (%u == %u)\n",
1253 map->s_partition_num, partitionNumber);
1254 if (map->s_partition_num == partitionNumber &&
1255 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1256 map->s_partition_type == UDF_SPARABLE_MAP15))
1257 break;
1258 }
1259
1260 if (i >= sbi->s_partitions) {
1261 udf_debug("Partition (%u) not found in partition map\n",
1262 partitionNumber);
1263 ret = 0;
1264 goto out_bh;
1265 }
1266
1267 ret = udf_fill_partdesc_info(sb, p, i);
1268 if (ret < 0)
1269 goto out_bh;
1270
1271 /*
1272 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1273 * PHYSICAL partitions are already set up
1274 */
1275 type1_idx = i;
1276 map = NULL; /* supress 'maybe used uninitialized' warning */
1277 for (i = 0; i < sbi->s_partitions; i++) {
1278 map = &sbi->s_partmaps[i];
1279
1280 if (map->s_partition_num == partitionNumber &&
1281 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1282 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1283 map->s_partition_type == UDF_METADATA_MAP25))
1284 break;
1285 }
1286
1287 if (i >= sbi->s_partitions) {
1288 ret = 0;
1289 goto out_bh;
1290 }
1291
1292 ret = udf_fill_partdesc_info(sb, p, i);
1293 if (ret < 0)
1294 goto out_bh;
1295
1296 if (map->s_partition_type == UDF_METADATA_MAP25) {
1297 ret = udf_load_metadata_files(sb, i, type1_idx);
1298 if (ret < 0) {
1299 udf_err(sb, "error loading MetaData partition map %d\n",
1300 i);
1301 goto out_bh;
1302 }
1303 } else {
1304 /*
1305 * If we have a partition with virtual map, we don't handle
1306 * writing to it (we overwrite blocks instead of relocating
1307 * them).
1308 */
1309 if (!sb_rdonly(sb)) {
1310 ret = -EACCES;
1311 goto out_bh;
1312 }
1313 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1314 ret = udf_load_vat(sb, i, type1_idx);
1315 if (ret < 0)
1316 goto out_bh;
1317 }
1318 ret = 0;
1319out_bh:
1320 /* In case loading failed, we handle cleanup in udf_fill_super */
1321 brelse(bh);
1322 return ret;
1323}
1324
1325static int udf_load_sparable_map(struct super_block *sb,
1326 struct udf_part_map *map,
1327 struct sparablePartitionMap *spm)
1328{
1329 uint32_t loc;
1330 uint16_t ident;
1331 struct sparingTable *st;
1332 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1333 int i;
1334 struct buffer_head *bh;
1335
1336 map->s_partition_type = UDF_SPARABLE_MAP15;
1337 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1338 if (!is_power_of_2(sdata->s_packet_len)) {
1339 udf_err(sb, "error loading logical volume descriptor: "
1340 "Invalid packet length %u\n",
1341 (unsigned)sdata->s_packet_len);
1342 return -EIO;
1343 }
1344 if (spm->numSparingTables > 4) {
1345 udf_err(sb, "error loading logical volume descriptor: "
1346 "Too many sparing tables (%d)\n",
1347 (int)spm->numSparingTables);
1348 return -EIO;
1349 }
1350 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1351 udf_err(sb, "error loading logical volume descriptor: "
1352 "Too big sparing table size (%u)\n",
1353 le32_to_cpu(spm->sizeSparingTable));
1354 return -EIO;
1355 }
1356
1357 for (i = 0; i < spm->numSparingTables; i++) {
1358 loc = le32_to_cpu(spm->locSparingTable[i]);
1359 bh = udf_read_tagged(sb, loc, loc, &ident);
1360 if (!bh)
1361 continue;
1362
1363 st = (struct sparingTable *)bh->b_data;
1364 if (ident != 0 ||
1365 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1366 strlen(UDF_ID_SPARING)) ||
1367 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1368 sb->s_blocksize) {
1369 brelse(bh);
1370 continue;
1371 }
1372
1373 sdata->s_spar_map[i] = bh;
1374 }
1375 map->s_partition_func = udf_get_pblock_spar15;
1376 return 0;
1377}
1378
1379static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1380 struct kernel_lb_addr *fileset)
1381{
1382 struct logicalVolDesc *lvd;
1383 int i, offset;
1384 uint8_t type;
1385 struct udf_sb_info *sbi = UDF_SB(sb);
1386 struct genericPartitionMap *gpm;
1387 uint16_t ident;
1388 struct buffer_head *bh;
1389 unsigned int table_len;
1390 int ret;
1391
1392 bh = udf_read_tagged(sb, block, block, &ident);
1393 if (!bh)
1394 return -EAGAIN;
1395 BUG_ON(ident != TAG_IDENT_LVD);
1396 lvd = (struct logicalVolDesc *)bh->b_data;
1397 table_len = le32_to_cpu(lvd->mapTableLength);
1398 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1399 udf_err(sb, "error loading logical volume descriptor: "
1400 "Partition table too long (%u > %lu)\n", table_len,
1401 sb->s_blocksize - sizeof(*lvd));
1402 ret = -EIO;
1403 goto out_bh;
1404 }
1405
1406 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1407 "logical volume");
1408 if (ret)
1409 goto out_bh;
1410 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1411 if (ret)
1412 goto out_bh;
1413
1414 for (i = 0, offset = 0;
1415 i < sbi->s_partitions && offset < table_len;
1416 i++, offset += gpm->partitionMapLength) {
1417 struct udf_part_map *map = &sbi->s_partmaps[i];
1418 gpm = (struct genericPartitionMap *)
1419 &(lvd->partitionMaps[offset]);
1420 type = gpm->partitionMapType;
1421 if (type == 1) {
1422 struct genericPartitionMap1 *gpm1 =
1423 (struct genericPartitionMap1 *)gpm;
1424 map->s_partition_type = UDF_TYPE1_MAP15;
1425 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1426 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1427 map->s_partition_func = NULL;
1428 } else if (type == 2) {
1429 struct udfPartitionMap2 *upm2 =
1430 (struct udfPartitionMap2 *)gpm;
1431 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1432 strlen(UDF_ID_VIRTUAL))) {
1433 u16 suf =
1434 le16_to_cpu(((__le16 *)upm2->partIdent.
1435 identSuffix)[0]);
1436 if (suf < 0x0200) {
1437 map->s_partition_type =
1438 UDF_VIRTUAL_MAP15;
1439 map->s_partition_func =
1440 udf_get_pblock_virt15;
1441 } else {
1442 map->s_partition_type =
1443 UDF_VIRTUAL_MAP20;
1444 map->s_partition_func =
1445 udf_get_pblock_virt20;
1446 }
1447 } else if (!strncmp(upm2->partIdent.ident,
1448 UDF_ID_SPARABLE,
1449 strlen(UDF_ID_SPARABLE))) {
1450 ret = udf_load_sparable_map(sb, map,
1451 (struct sparablePartitionMap *)gpm);
1452 if (ret < 0)
1453 goto out_bh;
1454 } else if (!strncmp(upm2->partIdent.ident,
1455 UDF_ID_METADATA,
1456 strlen(UDF_ID_METADATA))) {
1457 struct udf_meta_data *mdata =
1458 &map->s_type_specific.s_metadata;
1459 struct metadataPartitionMap *mdm =
1460 (struct metadataPartitionMap *)
1461 &(lvd->partitionMaps[offset]);
1462 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
1463 i, type, UDF_ID_METADATA);
1464
1465 map->s_partition_type = UDF_METADATA_MAP25;
1466 map->s_partition_func = udf_get_pblock_meta25;
1467
1468 mdata->s_meta_file_loc =
1469 le32_to_cpu(mdm->metadataFileLoc);
1470 mdata->s_mirror_file_loc =
1471 le32_to_cpu(mdm->metadataMirrorFileLoc);
1472 mdata->s_bitmap_file_loc =
1473 le32_to_cpu(mdm->metadataBitmapFileLoc);
1474 mdata->s_alloc_unit_size =
1475 le32_to_cpu(mdm->allocUnitSize);
1476 mdata->s_align_unit_size =
1477 le16_to_cpu(mdm->alignUnitSize);
1478 if (mdm->flags & 0x01)
1479 mdata->s_flags |= MF_DUPLICATE_MD;
1480
1481 udf_debug("Metadata Ident suffix=0x%x\n",
1482 le16_to_cpu(*(__le16 *)
1483 mdm->partIdent.identSuffix));
1484 udf_debug("Metadata part num=%u\n",
1485 le16_to_cpu(mdm->partitionNum));
1486 udf_debug("Metadata part alloc unit size=%u\n",
1487 le32_to_cpu(mdm->allocUnitSize));
1488 udf_debug("Metadata file loc=%u\n",
1489 le32_to_cpu(mdm->metadataFileLoc));
1490 udf_debug("Mirror file loc=%u\n",
1491 le32_to_cpu(mdm->metadataMirrorFileLoc));
1492 udf_debug("Bitmap file loc=%u\n",
1493 le32_to_cpu(mdm->metadataBitmapFileLoc));
1494 udf_debug("Flags: %d %u\n",
1495 mdata->s_flags, mdm->flags);
1496 } else {
1497 udf_debug("Unknown ident: %s\n",
1498 upm2->partIdent.ident);
1499 continue;
1500 }
1501 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1502 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1503 }
1504 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1505 i, map->s_partition_num, type, map->s_volumeseqnum);
1506 }
1507
1508 if (fileset) {
1509 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1510
1511 *fileset = lelb_to_cpu(la->extLocation);
1512 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1513 fileset->logicalBlockNum,
1514 fileset->partitionReferenceNum);
1515 }
1516 if (lvd->integritySeqExt.extLength)
1517 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1518 ret = 0;
1519
1520 if (!sbi->s_lvid_bh) {
1521 /* We can't generate unique IDs without a valid LVID */
1522 if (sb_rdonly(sb)) {
1523 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1524 } else {
1525 udf_warn(sb, "Damaged or missing LVID, forcing "
1526 "readonly mount\n");
1527 ret = -EACCES;
1528 }
1529 }
1530out_bh:
1531 brelse(bh);
1532 return ret;
1533}
1534
1535/*
1536 * Find the prevailing Logical Volume Integrity Descriptor.
1537 */
1538static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1539{
1540 struct buffer_head *bh, *final_bh;
1541 uint16_t ident;
1542 struct udf_sb_info *sbi = UDF_SB(sb);
1543 struct logicalVolIntegrityDesc *lvid;
1544 int indirections = 0;
1545 u32 parts, impuselen;
1546
1547 while (++indirections <= UDF_MAX_LVID_NESTING) {
1548 final_bh = NULL;
1549 while (loc.extLength > 0 &&
1550 (bh = udf_read_tagged(sb, loc.extLocation,
1551 loc.extLocation, &ident))) {
1552 if (ident != TAG_IDENT_LVID) {
1553 brelse(bh);
1554 break;
1555 }
1556
1557 brelse(final_bh);
1558 final_bh = bh;
1559
1560 loc.extLength -= sb->s_blocksize;
1561 loc.extLocation++;
1562 }
1563
1564 if (!final_bh)
1565 return;
1566
1567 brelse(sbi->s_lvid_bh);
1568 sbi->s_lvid_bh = final_bh;
1569
1570 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1571 if (lvid->nextIntegrityExt.extLength == 0)
1572 goto check;
1573
1574 loc = leea_to_cpu(lvid->nextIntegrityExt);
1575 }
1576
1577 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1578 UDF_MAX_LVID_NESTING);
1579out_err:
1580 brelse(sbi->s_lvid_bh);
1581 sbi->s_lvid_bh = NULL;
1582 return;
1583check:
1584 parts = le32_to_cpu(lvid->numOfPartitions);
1585 impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1586 if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1587 sizeof(struct logicalVolIntegrityDesc) + impuselen +
1588 2 * parts * sizeof(u32) > sb->s_blocksize) {
1589 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1590 "ignoring.\n", parts, impuselen);
1591 goto out_err;
1592 }
1593}
1594
1595/*
1596 * Step for reallocation of table of partition descriptor sequence numbers.
1597 * Must be power of 2.
1598 */
1599#define PART_DESC_ALLOC_STEP 32
1600
1601struct part_desc_seq_scan_data {
1602 struct udf_vds_record rec;
1603 u32 partnum;
1604};
1605
1606struct desc_seq_scan_data {
1607 struct udf_vds_record vds[VDS_POS_LENGTH];
1608 unsigned int size_part_descs;
1609 unsigned int num_part_descs;
1610 struct part_desc_seq_scan_data *part_descs_loc;
1611};
1612
1613static struct udf_vds_record *handle_partition_descriptor(
1614 struct buffer_head *bh,
1615 struct desc_seq_scan_data *data)
1616{
1617 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1618 int partnum;
1619 int i;
1620
1621 partnum = le16_to_cpu(desc->partitionNumber);
1622 for (i = 0; i < data->num_part_descs; i++)
1623 if (partnum == data->part_descs_loc[i].partnum)
1624 return &(data->part_descs_loc[i].rec);
1625 if (data->num_part_descs >= data->size_part_descs) {
1626 struct part_desc_seq_scan_data *new_loc;
1627 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1628
1629 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL);
1630 if (!new_loc)
1631 return ERR_PTR(-ENOMEM);
1632 memcpy(new_loc, data->part_descs_loc,
1633 data->size_part_descs * sizeof(*new_loc));
1634 kfree(data->part_descs_loc);
1635 data->part_descs_loc = new_loc;
1636 data->size_part_descs = new_size;
1637 }
1638 return &(data->part_descs_loc[data->num_part_descs++].rec);
1639}
1640
1641
1642static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1643 struct buffer_head *bh, struct desc_seq_scan_data *data)
1644{
1645 switch (ident) {
1646 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1647 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1648 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1649 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1650 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1651 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1652 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1653 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1654 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1655 return handle_partition_descriptor(bh, data);
1656 }
1657 return NULL;
1658}
1659
1660/*
1661 * Process a main/reserve volume descriptor sequence.
1662 * @block First block of first extent of the sequence.
1663 * @lastblock Lastblock of first extent of the sequence.
1664 * @fileset There we store extent containing root fileset
1665 *
1666 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1667 * sequence
1668 */
1669static noinline int udf_process_sequence(
1670 struct super_block *sb,
1671 sector_t block, sector_t lastblock,
1672 struct kernel_lb_addr *fileset)
1673{
1674 struct buffer_head *bh = NULL;
1675 struct udf_vds_record *curr;
1676 struct generic_desc *gd;
1677 struct volDescPtr *vdp;
1678 bool done = false;
1679 uint32_t vdsn;
1680 uint16_t ident;
1681 int ret;
1682 unsigned int indirections = 0;
1683 struct desc_seq_scan_data data;
1684 unsigned int i;
1685
1686 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1687 data.size_part_descs = PART_DESC_ALLOC_STEP;
1688 data.num_part_descs = 0;
1689 data.part_descs_loc = kcalloc(data.size_part_descs,
1690 sizeof(*data.part_descs_loc),
1691 GFP_KERNEL);
1692 if (!data.part_descs_loc)
1693 return -ENOMEM;
1694
1695 /*
1696 * Read the main descriptor sequence and find which descriptors
1697 * are in it.
1698 */
1699 for (; (!done && block <= lastblock); block++) {
1700 bh = udf_read_tagged(sb, block, block, &ident);
1701 if (!bh)
1702 break;
1703
1704 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1705 gd = (struct generic_desc *)bh->b_data;
1706 vdsn = le32_to_cpu(gd->volDescSeqNum);
1707 switch (ident) {
1708 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1709 if (++indirections > UDF_MAX_TD_NESTING) {
1710 udf_err(sb, "too many Volume Descriptor "
1711 "Pointers (max %u supported)\n",
1712 UDF_MAX_TD_NESTING);
1713 brelse(bh);
1714 ret = -EIO;
1715 goto out;
1716 }
1717
1718 vdp = (struct volDescPtr *)bh->b_data;
1719 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1720 lastblock = le32_to_cpu(
1721 vdp->nextVolDescSeqExt.extLength) >>
1722 sb->s_blocksize_bits;
1723 lastblock += block - 1;
1724 /* For loop is going to increment 'block' again */
1725 block--;
1726 break;
1727 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1728 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1729 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1730 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1731 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1732 curr = get_volume_descriptor_record(ident, bh, &data);
1733 if (IS_ERR(curr)) {
1734 brelse(bh);
1735 ret = PTR_ERR(curr);
1736 goto out;
1737 }
1738 /* Descriptor we don't care about? */
1739 if (!curr)
1740 break;
1741 if (vdsn >= curr->volDescSeqNum) {
1742 curr->volDescSeqNum = vdsn;
1743 curr->block = block;
1744 }
1745 break;
1746 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1747 done = true;
1748 break;
1749 }
1750 brelse(bh);
1751 }
1752 /*
1753 * Now read interesting descriptors again and process them
1754 * in a suitable order
1755 */
1756 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1757 udf_err(sb, "Primary Volume Descriptor not found!\n");
1758 ret = -EAGAIN;
1759 goto out;
1760 }
1761 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1762 if (ret < 0)
1763 goto out;
1764
1765 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1766 ret = udf_load_logicalvol(sb,
1767 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1768 fileset);
1769 if (ret < 0)
1770 goto out;
1771 }
1772
1773 /* Now handle prevailing Partition Descriptors */
1774 for (i = 0; i < data.num_part_descs; i++) {
1775 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1776 if (ret < 0)
1777 goto out;
1778 }
1779 ret = 0;
1780out:
1781 kfree(data.part_descs_loc);
1782 return ret;
1783}
1784
1785/*
1786 * Load Volume Descriptor Sequence described by anchor in bh
1787 *
1788 * Returns <0 on error, 0 on success
1789 */
1790static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1791 struct kernel_lb_addr *fileset)
1792{
1793 struct anchorVolDescPtr *anchor;
1794 sector_t main_s, main_e, reserve_s, reserve_e;
1795 int ret;
1796
1797 anchor = (struct anchorVolDescPtr *)bh->b_data;
1798
1799 /* Locate the main sequence */
1800 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1801 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1802 main_e = main_e >> sb->s_blocksize_bits;
1803 main_e += main_s - 1;
1804
1805 /* Locate the reserve sequence */
1806 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1807 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1808 reserve_e = reserve_e >> sb->s_blocksize_bits;
1809 reserve_e += reserve_s - 1;
1810
1811 /* Process the main & reserve sequences */
1812 /* responsible for finding the PartitionDesc(s) */
1813 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1814 if (ret != -EAGAIN)
1815 return ret;
1816 udf_sb_free_partitions(sb);
1817 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1818 if (ret < 0) {
1819 udf_sb_free_partitions(sb);
1820 /* No sequence was OK, return -EIO */
1821 if (ret == -EAGAIN)
1822 ret = -EIO;
1823 }
1824 return ret;
1825}
1826
1827/*
1828 * Check whether there is an anchor block in the given block and
1829 * load Volume Descriptor Sequence if so.
1830 *
1831 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1832 * block
1833 */
1834static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1835 struct kernel_lb_addr *fileset)
1836{
1837 struct buffer_head *bh;
1838 uint16_t ident;
1839 int ret;
1840
1841 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1842 udf_fixed_to_variable(block) >= sb_bdev_nr_blocks(sb))
1843 return -EAGAIN;
1844
1845 bh = udf_read_tagged(sb, block, block, &ident);
1846 if (!bh)
1847 return -EAGAIN;
1848 if (ident != TAG_IDENT_AVDP) {
1849 brelse(bh);
1850 return -EAGAIN;
1851 }
1852 ret = udf_load_sequence(sb, bh, fileset);
1853 brelse(bh);
1854 return ret;
1855}
1856
1857/*
1858 * Search for an anchor volume descriptor pointer.
1859 *
1860 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1861 * of anchors.
1862 */
1863static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1864 struct kernel_lb_addr *fileset)
1865{
1866 sector_t last[6];
1867 int i;
1868 struct udf_sb_info *sbi = UDF_SB(sb);
1869 int last_count = 0;
1870 int ret;
1871
1872 /* First try user provided anchor */
1873 if (sbi->s_anchor) {
1874 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1875 if (ret != -EAGAIN)
1876 return ret;
1877 }
1878 /*
1879 * according to spec, anchor is in either:
1880 * block 256
1881 * lastblock-256
1882 * lastblock
1883 * however, if the disc isn't closed, it could be 512.
1884 */
1885 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1886 if (ret != -EAGAIN)
1887 return ret;
1888 /*
1889 * The trouble is which block is the last one. Drives often misreport
1890 * this so we try various possibilities.
1891 */
1892 last[last_count++] = *lastblock;
1893 if (*lastblock >= 1)
1894 last[last_count++] = *lastblock - 1;
1895 last[last_count++] = *lastblock + 1;
1896 if (*lastblock >= 2)
1897 last[last_count++] = *lastblock - 2;
1898 if (*lastblock >= 150)
1899 last[last_count++] = *lastblock - 150;
1900 if (*lastblock >= 152)
1901 last[last_count++] = *lastblock - 152;
1902
1903 for (i = 0; i < last_count; i++) {
1904 if (last[i] >= sb_bdev_nr_blocks(sb))
1905 continue;
1906 ret = udf_check_anchor_block(sb, last[i], fileset);
1907 if (ret != -EAGAIN) {
1908 if (!ret)
1909 *lastblock = last[i];
1910 return ret;
1911 }
1912 if (last[i] < 256)
1913 continue;
1914 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1915 if (ret != -EAGAIN) {
1916 if (!ret)
1917 *lastblock = last[i];
1918 return ret;
1919 }
1920 }
1921
1922 /* Finally try block 512 in case media is open */
1923 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1924}
1925
1926/*
1927 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1928 * area specified by it. The function expects sbi->s_lastblock to be the last
1929 * block on the media.
1930 *
1931 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1932 * was not found.
1933 */
1934static int udf_find_anchor(struct super_block *sb,
1935 struct kernel_lb_addr *fileset)
1936{
1937 struct udf_sb_info *sbi = UDF_SB(sb);
1938 sector_t lastblock = sbi->s_last_block;
1939 int ret;
1940
1941 ret = udf_scan_anchors(sb, &lastblock, fileset);
1942 if (ret != -EAGAIN)
1943 goto out;
1944
1945 /* No anchor found? Try VARCONV conversion of block numbers */
1946 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1947 lastblock = udf_variable_to_fixed(sbi->s_last_block);
1948 /* Firstly, we try to not convert number of the last block */
1949 ret = udf_scan_anchors(sb, &lastblock, fileset);
1950 if (ret != -EAGAIN)
1951 goto out;
1952
1953 lastblock = sbi->s_last_block;
1954 /* Secondly, we try with converted number of the last block */
1955 ret = udf_scan_anchors(sb, &lastblock, fileset);
1956 if (ret < 0) {
1957 /* VARCONV didn't help. Clear it. */
1958 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1959 }
1960out:
1961 if (ret == 0)
1962 sbi->s_last_block = lastblock;
1963 return ret;
1964}
1965
1966/*
1967 * Check Volume Structure Descriptor, find Anchor block and load Volume
1968 * Descriptor Sequence.
1969 *
1970 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1971 * block was not found.
1972 */
1973static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1974 int silent, struct kernel_lb_addr *fileset)
1975{
1976 struct udf_sb_info *sbi = UDF_SB(sb);
1977 int nsr = 0;
1978 int ret;
1979
1980 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1981 if (!silent)
1982 udf_warn(sb, "Bad block size\n");
1983 return -EINVAL;
1984 }
1985 sbi->s_last_block = uopt->lastblock;
1986 if (!uopt->novrs) {
1987 /* Check that it is NSR02 compliant */
1988 nsr = udf_check_vsd(sb);
1989 if (!nsr) {
1990 if (!silent)
1991 udf_warn(sb, "No VRS found\n");
1992 return -EINVAL;
1993 }
1994 if (nsr == -1)
1995 udf_debug("Failed to read sector at offset %d. "
1996 "Assuming open disc. Skipping validity "
1997 "check\n", VSD_FIRST_SECTOR_OFFSET);
1998 if (!sbi->s_last_block)
1999 sbi->s_last_block = udf_get_last_block(sb);
2000 } else {
2001 udf_debug("Validity check skipped because of novrs option\n");
2002 }
2003
2004 /* Look for anchor block and load Volume Descriptor Sequence */
2005 sbi->s_anchor = uopt->anchor;
2006 ret = udf_find_anchor(sb, fileset);
2007 if (ret < 0) {
2008 if (!silent && ret == -EAGAIN)
2009 udf_warn(sb, "No anchor found\n");
2010 return ret;
2011 }
2012 return 0;
2013}
2014
2015static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2016{
2017 struct timespec64 ts;
2018
2019 ktime_get_real_ts64(&ts);
2020 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2021 lvid->descTag.descCRC = cpu_to_le16(
2022 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2023 le16_to_cpu(lvid->descTag.descCRCLength)));
2024 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2025}
2026
2027static void udf_open_lvid(struct super_block *sb)
2028{
2029 struct udf_sb_info *sbi = UDF_SB(sb);
2030 struct buffer_head *bh = sbi->s_lvid_bh;
2031 struct logicalVolIntegrityDesc *lvid;
2032 struct logicalVolIntegrityDescImpUse *lvidiu;
2033
2034 if (!bh)
2035 return;
2036 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2037 lvidiu = udf_sb_lvidiu(sb);
2038 if (!lvidiu)
2039 return;
2040
2041 mutex_lock(&sbi->s_alloc_mutex);
2042 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2043 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2044 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2045 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2046 else
2047 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2048
2049 udf_finalize_lvid(lvid);
2050 mark_buffer_dirty(bh);
2051 sbi->s_lvid_dirty = 0;
2052 mutex_unlock(&sbi->s_alloc_mutex);
2053 /* Make opening of filesystem visible on the media immediately */
2054 sync_dirty_buffer(bh);
2055}
2056
2057static void udf_close_lvid(struct super_block *sb)
2058{
2059 struct udf_sb_info *sbi = UDF_SB(sb);
2060 struct buffer_head *bh = sbi->s_lvid_bh;
2061 struct logicalVolIntegrityDesc *lvid;
2062 struct logicalVolIntegrityDescImpUse *lvidiu;
2063
2064 if (!bh)
2065 return;
2066 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2067 lvidiu = udf_sb_lvidiu(sb);
2068 if (!lvidiu)
2069 return;
2070
2071 mutex_lock(&sbi->s_alloc_mutex);
2072 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2073 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2074 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2075 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2076 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2077 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2078 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2079 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2080 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2081 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2082
2083 /*
2084 * We set buffer uptodate unconditionally here to avoid spurious
2085 * warnings from mark_buffer_dirty() when previous EIO has marked
2086 * the buffer as !uptodate
2087 */
2088 set_buffer_uptodate(bh);
2089 udf_finalize_lvid(lvid);
2090 mark_buffer_dirty(bh);
2091 sbi->s_lvid_dirty = 0;
2092 mutex_unlock(&sbi->s_alloc_mutex);
2093 /* Make closing of filesystem visible on the media immediately */
2094 sync_dirty_buffer(bh);
2095}
2096
2097u64 lvid_get_unique_id(struct super_block *sb)
2098{
2099 struct buffer_head *bh;
2100 struct udf_sb_info *sbi = UDF_SB(sb);
2101 struct logicalVolIntegrityDesc *lvid;
2102 struct logicalVolHeaderDesc *lvhd;
2103 u64 uniqueID;
2104 u64 ret;
2105
2106 bh = sbi->s_lvid_bh;
2107 if (!bh)
2108 return 0;
2109
2110 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2111 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2112
2113 mutex_lock(&sbi->s_alloc_mutex);
2114 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2115 if (!(++uniqueID & 0xFFFFFFFF))
2116 uniqueID += 16;
2117 lvhd->uniqueID = cpu_to_le64(uniqueID);
2118 udf_updated_lvid(sb);
2119 mutex_unlock(&sbi->s_alloc_mutex);
2120
2121 return ret;
2122}
2123
2124static int udf_fill_super(struct super_block *sb, void *options, int silent)
2125{
2126 int ret = -EINVAL;
2127 struct inode *inode = NULL;
2128 struct udf_options uopt;
2129 struct kernel_lb_addr rootdir, fileset;
2130 struct udf_sb_info *sbi;
2131 bool lvid_open = false;
2132
2133 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2134 /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2135 uopt.uid = make_kuid(current_user_ns(), overflowuid);
2136 uopt.gid = make_kgid(current_user_ns(), overflowgid);
2137 uopt.umask = 0;
2138 uopt.fmode = UDF_INVALID_MODE;
2139 uopt.dmode = UDF_INVALID_MODE;
2140 uopt.nls_map = NULL;
2141
2142 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2143 if (!sbi)
2144 return -ENOMEM;
2145
2146 sb->s_fs_info = sbi;
2147
2148 mutex_init(&sbi->s_alloc_mutex);
2149
2150 if (!udf_parse_options((char *)options, &uopt, false))
2151 goto parse_options_failure;
2152
2153 fileset.logicalBlockNum = 0xFFFFFFFF;
2154 fileset.partitionReferenceNum = 0xFFFF;
2155
2156 sbi->s_flags = uopt.flags;
2157 sbi->s_uid = uopt.uid;
2158 sbi->s_gid = uopt.gid;
2159 sbi->s_umask = uopt.umask;
2160 sbi->s_fmode = uopt.fmode;
2161 sbi->s_dmode = uopt.dmode;
2162 sbi->s_nls_map = uopt.nls_map;
2163 rwlock_init(&sbi->s_cred_lock);
2164
2165 if (uopt.session == 0xFFFFFFFF)
2166 sbi->s_session = udf_get_last_session(sb);
2167 else
2168 sbi->s_session = uopt.session;
2169
2170 udf_debug("Multi-session=%d\n", sbi->s_session);
2171
2172 /* Fill in the rest of the superblock */
2173 sb->s_op = &udf_sb_ops;
2174 sb->s_export_op = &udf_export_ops;
2175
2176 sb->s_magic = UDF_SUPER_MAGIC;
2177 sb->s_time_gran = 1000;
2178
2179 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2180 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2181 } else {
2182 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2183 while (uopt.blocksize <= 4096) {
2184 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2185 if (ret < 0) {
2186 if (!silent && ret != -EACCES) {
2187 pr_notice("Scanning with blocksize %u failed\n",
2188 uopt.blocksize);
2189 }
2190 brelse(sbi->s_lvid_bh);
2191 sbi->s_lvid_bh = NULL;
2192 /*
2193 * EACCES is special - we want to propagate to
2194 * upper layers that we cannot handle RW mount.
2195 */
2196 if (ret == -EACCES)
2197 break;
2198 } else
2199 break;
2200
2201 uopt.blocksize <<= 1;
2202 }
2203 }
2204 if (ret < 0) {
2205 if (ret == -EAGAIN) {
2206 udf_warn(sb, "No partition found (1)\n");
2207 ret = -EINVAL;
2208 }
2209 goto error_out;
2210 }
2211
2212 udf_debug("Lastblock=%u\n", sbi->s_last_block);
2213
2214 if (sbi->s_lvid_bh) {
2215 struct logicalVolIntegrityDescImpUse *lvidiu =
2216 udf_sb_lvidiu(sb);
2217 uint16_t minUDFReadRev;
2218 uint16_t minUDFWriteRev;
2219
2220 if (!lvidiu) {
2221 ret = -EINVAL;
2222 goto error_out;
2223 }
2224 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2225 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2226 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2227 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2228 minUDFReadRev,
2229 UDF_MAX_READ_VERSION);
2230 ret = -EINVAL;
2231 goto error_out;
2232 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2233 if (!sb_rdonly(sb)) {
2234 ret = -EACCES;
2235 goto error_out;
2236 }
2237 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2238 }
2239
2240 sbi->s_udfrev = minUDFWriteRev;
2241
2242 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2243 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2244 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2245 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2246 }
2247
2248 if (!sbi->s_partitions) {
2249 udf_warn(sb, "No partition found (2)\n");
2250 ret = -EINVAL;
2251 goto error_out;
2252 }
2253
2254 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2255 UDF_PART_FLAG_READ_ONLY) {
2256 if (!sb_rdonly(sb)) {
2257 ret = -EACCES;
2258 goto error_out;
2259 }
2260 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2261 }
2262
2263 ret = udf_find_fileset(sb, &fileset, &rootdir);
2264 if (ret < 0) {
2265 udf_warn(sb, "No fileset found\n");
2266 goto error_out;
2267 }
2268
2269 if (!silent) {
2270 struct timestamp ts;
2271 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2272 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2273 sbi->s_volume_ident,
2274 le16_to_cpu(ts.year), ts.month, ts.day,
2275 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2276 }
2277 if (!sb_rdonly(sb)) {
2278 udf_open_lvid(sb);
2279 lvid_open = true;
2280 }
2281
2282 /* Assign the root inode */
2283 /* assign inodes by physical block number */
2284 /* perhaps it's not extensible enough, but for now ... */
2285 inode = udf_iget(sb, &rootdir);
2286 if (IS_ERR(inode)) {
2287 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2288 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2289 ret = PTR_ERR(inode);
2290 goto error_out;
2291 }
2292
2293 /* Allocate a dentry for the root inode */
2294 sb->s_root = d_make_root(inode);
2295 if (!sb->s_root) {
2296 udf_err(sb, "Couldn't allocate root dentry\n");
2297 ret = -ENOMEM;
2298 goto error_out;
2299 }
2300 sb->s_maxbytes = MAX_LFS_FILESIZE;
2301 sb->s_max_links = UDF_MAX_LINKS;
2302 return 0;
2303
2304error_out:
2305 iput(sbi->s_vat_inode);
2306parse_options_failure:
2307 unload_nls(uopt.nls_map);
2308 if (lvid_open)
2309 udf_close_lvid(sb);
2310 brelse(sbi->s_lvid_bh);
2311 udf_sb_free_partitions(sb);
2312 kfree(sbi);
2313 sb->s_fs_info = NULL;
2314
2315 return ret;
2316}
2317
2318void _udf_err(struct super_block *sb, const char *function,
2319 const char *fmt, ...)
2320{
2321 struct va_format vaf;
2322 va_list args;
2323
2324 va_start(args, fmt);
2325
2326 vaf.fmt = fmt;
2327 vaf.va = &args;
2328
2329 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2330
2331 va_end(args);
2332}
2333
2334void _udf_warn(struct super_block *sb, const char *function,
2335 const char *fmt, ...)
2336{
2337 struct va_format vaf;
2338 va_list args;
2339
2340 va_start(args, fmt);
2341
2342 vaf.fmt = fmt;
2343 vaf.va = &args;
2344
2345 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2346
2347 va_end(args);
2348}
2349
2350static void udf_put_super(struct super_block *sb)
2351{
2352 struct udf_sb_info *sbi;
2353
2354 sbi = UDF_SB(sb);
2355
2356 iput(sbi->s_vat_inode);
2357 unload_nls(sbi->s_nls_map);
2358 if (!sb_rdonly(sb))
2359 udf_close_lvid(sb);
2360 brelse(sbi->s_lvid_bh);
2361 udf_sb_free_partitions(sb);
2362 mutex_destroy(&sbi->s_alloc_mutex);
2363 kfree(sb->s_fs_info);
2364 sb->s_fs_info = NULL;
2365}
2366
2367static int udf_sync_fs(struct super_block *sb, int wait)
2368{
2369 struct udf_sb_info *sbi = UDF_SB(sb);
2370
2371 mutex_lock(&sbi->s_alloc_mutex);
2372 if (sbi->s_lvid_dirty) {
2373 struct buffer_head *bh = sbi->s_lvid_bh;
2374 struct logicalVolIntegrityDesc *lvid;
2375
2376 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2377 udf_finalize_lvid(lvid);
2378
2379 /*
2380 * Blockdevice will be synced later so we don't have to submit
2381 * the buffer for IO
2382 */
2383 mark_buffer_dirty(bh);
2384 sbi->s_lvid_dirty = 0;
2385 }
2386 mutex_unlock(&sbi->s_alloc_mutex);
2387
2388 return 0;
2389}
2390
2391static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2392{
2393 struct super_block *sb = dentry->d_sb;
2394 struct udf_sb_info *sbi = UDF_SB(sb);
2395 struct logicalVolIntegrityDescImpUse *lvidiu;
2396 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2397
2398 lvidiu = udf_sb_lvidiu(sb);
2399 buf->f_type = UDF_SUPER_MAGIC;
2400 buf->f_bsize = sb->s_blocksize;
2401 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2402 buf->f_bfree = udf_count_free(sb);
2403 buf->f_bavail = buf->f_bfree;
2404 /*
2405 * Let's pretend each free block is also a free 'inode' since UDF does
2406 * not have separate preallocated table of inodes.
2407 */
2408 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2409 le32_to_cpu(lvidiu->numDirs)) : 0)
2410 + buf->f_bfree;
2411 buf->f_ffree = buf->f_bfree;
2412 buf->f_namelen = UDF_NAME_LEN;
2413 buf->f_fsid = u64_to_fsid(id);
2414
2415 return 0;
2416}
2417
2418static unsigned int udf_count_free_bitmap(struct super_block *sb,
2419 struct udf_bitmap *bitmap)
2420{
2421 struct buffer_head *bh = NULL;
2422 unsigned int accum = 0;
2423 int index;
2424 udf_pblk_t block = 0, newblock;
2425 struct kernel_lb_addr loc;
2426 uint32_t bytes;
2427 uint8_t *ptr;
2428 uint16_t ident;
2429 struct spaceBitmapDesc *bm;
2430
2431 loc.logicalBlockNum = bitmap->s_extPosition;
2432 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2433 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2434
2435 if (!bh) {
2436 udf_err(sb, "udf_count_free failed\n");
2437 goto out;
2438 } else if (ident != TAG_IDENT_SBD) {
2439 brelse(bh);
2440 udf_err(sb, "udf_count_free failed\n");
2441 goto out;
2442 }
2443
2444 bm = (struct spaceBitmapDesc *)bh->b_data;
2445 bytes = le32_to_cpu(bm->numOfBytes);
2446 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2447 ptr = (uint8_t *)bh->b_data;
2448
2449 while (bytes > 0) {
2450 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2451 accum += bitmap_weight((const unsigned long *)(ptr + index),
2452 cur_bytes * 8);
2453 bytes -= cur_bytes;
2454 if (bytes) {
2455 brelse(bh);
2456 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2457 bh = udf_tread(sb, newblock);
2458 if (!bh) {
2459 udf_debug("read failed\n");
2460 goto out;
2461 }
2462 index = 0;
2463 ptr = (uint8_t *)bh->b_data;
2464 }
2465 }
2466 brelse(bh);
2467out:
2468 return accum;
2469}
2470
2471static unsigned int udf_count_free_table(struct super_block *sb,
2472 struct inode *table)
2473{
2474 unsigned int accum = 0;
2475 uint32_t elen;
2476 struct kernel_lb_addr eloc;
2477 struct extent_position epos;
2478
2479 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2480 epos.block = UDF_I(table)->i_location;
2481 epos.offset = sizeof(struct unallocSpaceEntry);
2482 epos.bh = NULL;
2483
2484 while (udf_next_aext(table, &epos, &eloc, &elen, 1) != -1)
2485 accum += (elen >> table->i_sb->s_blocksize_bits);
2486
2487 brelse(epos.bh);
2488 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2489
2490 return accum;
2491}
2492
2493static unsigned int udf_count_free(struct super_block *sb)
2494{
2495 unsigned int accum = 0;
2496 struct udf_sb_info *sbi = UDF_SB(sb);
2497 struct udf_part_map *map;
2498 unsigned int part = sbi->s_partition;
2499 int ptype = sbi->s_partmaps[part].s_partition_type;
2500
2501 if (ptype == UDF_METADATA_MAP25) {
2502 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2503 s_phys_partition_ref;
2504 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2505 /*
2506 * Filesystems with VAT are append-only and we cannot write to
2507 * them. Let's just report 0 here.
2508 */
2509 return 0;
2510 }
2511
2512 if (sbi->s_lvid_bh) {
2513 struct logicalVolIntegrityDesc *lvid =
2514 (struct logicalVolIntegrityDesc *)
2515 sbi->s_lvid_bh->b_data;
2516 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2517 accum = le32_to_cpu(
2518 lvid->freeSpaceTable[part]);
2519 if (accum == 0xFFFFFFFF)
2520 accum = 0;
2521 }
2522 }
2523
2524 if (accum)
2525 return accum;
2526
2527 map = &sbi->s_partmaps[part];
2528 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2529 accum += udf_count_free_bitmap(sb,
2530 map->s_uspace.s_bitmap);
2531 }
2532 if (accum)
2533 return accum;
2534
2535 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2536 accum += udf_count_free_table(sb,
2537 map->s_uspace.s_table);
2538 }
2539 return accum;
2540}
2541
2542MODULE_AUTHOR("Ben Fennema");
2543MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2544MODULE_LICENSE("GPL");
2545module_init(init_udf_fs)
2546module_exit(exit_udf_fs)
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 *
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
36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
41#include "udfdecl.h"
42
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/buffer_head.h>
52#include <linux/vfs.h>
53#include <linux/vmalloc.h>
54#include <linux/errno.h>
55#include <linux/mount.h>
56#include <linux/seq_file.h>
57#include <linux/bitmap.h>
58#include <linux/crc-itu-t.h>
59#include <linux/log2.h>
60#include <asm/byteorder.h>
61
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
77#define UDF_DEFAULT_BLOCKSIZE 2048
78
79enum { UDF_MAX_LINKS = 0xffff };
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 int udf_sync_fs(struct super_block *, int);
85static int udf_remount_fs(struct super_block *, int *, char *);
86static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
87static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
88 struct kernel_lb_addr *);
89static void udf_load_fileset(struct super_block *, struct buffer_head *,
90 struct kernel_lb_addr *);
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 *);
94static int udf_statfs(struct dentry *, struct kstatfs *);
95static int udf_show_options(struct seq_file *, struct dentry *);
96
97struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
98{
99 struct logicalVolIntegrityDesc *lvid =
100 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
101 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
102 __u32 offset = number_of_partitions * 2 *
103 sizeof(uint32_t)/sizeof(uint8_t);
104 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
105}
106
107/* UDF filesystem type */
108static struct dentry *udf_mount(struct file_system_type *fs_type,
109 int flags, const char *dev_name, void *data)
110{
111 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
112}
113
114static struct file_system_type udf_fstype = {
115 .owner = THIS_MODULE,
116 .name = "udf",
117 .mount = udf_mount,
118 .kill_sb = kill_block_super,
119 .fs_flags = FS_REQUIRES_DEV,
120};
121
122static struct kmem_cache *udf_inode_cachep;
123
124static struct inode *udf_alloc_inode(struct super_block *sb)
125{
126 struct udf_inode_info *ei;
127 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
128 if (!ei)
129 return NULL;
130
131 ei->i_unique = 0;
132 ei->i_lenExtents = 0;
133 ei->i_next_alloc_block = 0;
134 ei->i_next_alloc_goal = 0;
135 ei->i_strat4096 = 0;
136 init_rwsem(&ei->i_data_sem);
137
138 return &ei->vfs_inode;
139}
140
141static void udf_i_callback(struct rcu_head *head)
142{
143 struct inode *inode = container_of(head, struct inode, i_rcu);
144 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
145}
146
147static void udf_destroy_inode(struct inode *inode)
148{
149 call_rcu(&inode->i_rcu, udf_i_callback);
150}
151
152static void init_once(void *foo)
153{
154 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
155
156 ei->i_ext.i_data = NULL;
157 inode_init_once(&ei->vfs_inode);
158}
159
160static int init_inodecache(void)
161{
162 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
163 sizeof(struct udf_inode_info),
164 0, (SLAB_RECLAIM_ACCOUNT |
165 SLAB_MEM_SPREAD),
166 init_once);
167 if (!udf_inode_cachep)
168 return -ENOMEM;
169 return 0;
170}
171
172static void destroy_inodecache(void)
173{
174 kmem_cache_destroy(udf_inode_cachep);
175}
176
177/* Superblock operations */
178static const struct super_operations udf_sb_ops = {
179 .alloc_inode = udf_alloc_inode,
180 .destroy_inode = udf_destroy_inode,
181 .write_inode = udf_write_inode,
182 .evict_inode = udf_evict_inode,
183 .put_super = udf_put_super,
184 .sync_fs = udf_sync_fs,
185 .statfs = udf_statfs,
186 .remount_fs = udf_remount_fs,
187 .show_options = udf_show_options,
188};
189
190struct udf_options {
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 umode_t umask;
202 gid_t gid;
203 uid_t uid;
204 umode_t fmode;
205 umode_t dmode;
206 struct nls_table *nls_map;
207};
208
209static int __init init_udf_fs(void)
210{
211 int err;
212
213 err = init_inodecache();
214 if (err)
215 goto out1;
216 err = register_filesystem(&udf_fstype);
217 if (err)
218 goto out;
219
220 return 0;
221
222out:
223 destroy_inodecache();
224
225out1:
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)
236module_exit(exit_udf_fs)
237
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) {
245 udf_err(sb, "Unable to allocate space for %d partition maps\n",
246 count);
247 sbi->s_partitions = 0;
248 return -ENOMEM;
249 }
250
251 sbi->s_partitions = count;
252 return 0;
253}
254
255static int udf_show_options(struct seq_file *seq, struct dentry *root)
256{
257 struct super_block *sb = root->d_sb;
258 struct udf_sb_info *sbi = UDF_SB(sb);
259
260 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
261 seq_puts(seq, ",nostrict");
262 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
263 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
264 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
265 seq_puts(seq, ",unhide");
266 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
267 seq_puts(seq, ",undelete");
268 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
269 seq_puts(seq, ",noadinicb");
270 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
271 seq_puts(seq, ",shortad");
272 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
273 seq_puts(seq, ",uid=forget");
274 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
275 seq_puts(seq, ",uid=ignore");
276 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
277 seq_puts(seq, ",gid=forget");
278 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
279 seq_puts(seq, ",gid=ignore");
280 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
281 seq_printf(seq, ",uid=%u", sbi->s_uid);
282 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
283 seq_printf(seq, ",gid=%u", sbi->s_gid);
284 if (sbi->s_umask != 0)
285 seq_printf(seq, ",umask=%ho", sbi->s_umask);
286 if (sbi->s_fmode != UDF_INVALID_MODE)
287 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
288 if (sbi->s_dmode != UDF_INVALID_MODE)
289 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
290 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
291 seq_printf(seq, ",session=%u", sbi->s_session);
292 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
293 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
294 if (sbi->s_anchor != 0)
295 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
296 /*
297 * volume, partition, fileset and rootdir seem to be ignored
298 * currently
299 */
300 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
301 seq_puts(seq, ",utf8");
302 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
303 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
304
305 return 0;
306}
307
308/*
309 * udf_parse_options
310 *
311 * PURPOSE
312 * Parse mount options.
313 *
314 * DESCRIPTION
315 * The following mount options are supported:
316 *
317 * gid= Set the default group.
318 * umask= Set the default umask.
319 * mode= Set the default file permissions.
320 * dmode= Set the default directory permissions.
321 * uid= Set the default user.
322 * bs= Set the block size.
323 * unhide Show otherwise hidden files.
324 * undelete Show deleted files in lists.
325 * adinicb Embed data in the inode (default)
326 * noadinicb Don't embed data in the inode
327 * shortad Use short ad's
328 * longad Use long ad's (default)
329 * nostrict Unset strict conformance
330 * iocharset= Set the NLS character set
331 *
332 * The remaining are for debugging and disaster recovery:
333 *
334 * novrs Skip volume sequence recognition
335 *
336 * The following expect a offset from 0.
337 *
338 * session= Set the CDROM session (default= last session)
339 * anchor= Override standard anchor location. (default= 256)
340 * volume= Override the VolumeDesc location. (unused)
341 * partition= Override the PartitionDesc location. (unused)
342 * lastblock= Set the last block of the filesystem/
343 *
344 * The following expect a offset from the partition root.
345 *
346 * fileset= Override the fileset block location. (unused)
347 * rootdir= Override the root directory location. (unused)
348 * WARNING: overriding the rootdir to a non-directory may
349 * yield highly unpredictable results.
350 *
351 * PRE-CONDITIONS
352 * options Pointer to mount options string.
353 * uopts Pointer to mount options variable.
354 *
355 * POST-CONDITIONS
356 * <return> 1 Mount options parsed okay.
357 * <return> 0 Error parsing mount options.
358 *
359 * HISTORY
360 * July 1, 1997 - Andrew E. Mileski
361 * Written, tested, and released.
362 */
363
364enum {
365 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
366 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
367 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
368 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
369 Opt_rootdir, Opt_utf8, Opt_iocharset,
370 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
371 Opt_fmode, Opt_dmode
372};
373
374static const match_table_t tokens = {
375 {Opt_novrs, "novrs"},
376 {Opt_nostrict, "nostrict"},
377 {Opt_bs, "bs=%u"},
378 {Opt_unhide, "unhide"},
379 {Opt_undelete, "undelete"},
380 {Opt_noadinicb, "noadinicb"},
381 {Opt_adinicb, "adinicb"},
382 {Opt_shortad, "shortad"},
383 {Opt_longad, "longad"},
384 {Opt_uforget, "uid=forget"},
385 {Opt_uignore, "uid=ignore"},
386 {Opt_gforget, "gid=forget"},
387 {Opt_gignore, "gid=ignore"},
388 {Opt_gid, "gid=%u"},
389 {Opt_uid, "uid=%u"},
390 {Opt_umask, "umask=%o"},
391 {Opt_session, "session=%u"},
392 {Opt_lastblock, "lastblock=%u"},
393 {Opt_anchor, "anchor=%u"},
394 {Opt_volume, "volume=%u"},
395 {Opt_partition, "partition=%u"},
396 {Opt_fileset, "fileset=%u"},
397 {Opt_rootdir, "rootdir=%u"},
398 {Opt_utf8, "utf8"},
399 {Opt_iocharset, "iocharset=%s"},
400 {Opt_fmode, "mode=%o"},
401 {Opt_dmode, "dmode=%o"},
402 {Opt_err, NULL}
403};
404
405static int udf_parse_options(char *options, struct udf_options *uopt,
406 bool remount)
407{
408 char *p;
409 int option;
410
411 uopt->novrs = 0;
412 uopt->partition = 0xFFFF;
413 uopt->session = 0xFFFFFFFF;
414 uopt->lastblock = 0;
415 uopt->anchor = 0;
416 uopt->volume = 0xFFFFFFFF;
417 uopt->rootdir = 0xFFFFFFFF;
418 uopt->fileset = 0xFFFFFFFF;
419 uopt->nls_map = NULL;
420
421 if (!options)
422 return 1;
423
424 while ((p = strsep(&options, ",")) != NULL) {
425 substring_t args[MAX_OPT_ARGS];
426 int token;
427 if (!*p)
428 continue;
429
430 token = match_token(p, tokens, args);
431 switch (token) {
432 case Opt_novrs:
433 uopt->novrs = 1;
434 break;
435 case Opt_bs:
436 if (match_int(&args[0], &option))
437 return 0;
438 uopt->blocksize = option;
439 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
440 break;
441 case Opt_unhide:
442 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
443 break;
444 case Opt_undelete:
445 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
446 break;
447 case Opt_noadinicb:
448 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
449 break;
450 case Opt_adinicb:
451 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
452 break;
453 case Opt_shortad:
454 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
455 break;
456 case Opt_longad:
457 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
458 break;
459 case Opt_gid:
460 if (match_int(args, &option))
461 return 0;
462 uopt->gid = option;
463 uopt->flags |= (1 << UDF_FLAG_GID_SET);
464 break;
465 case Opt_uid:
466 if (match_int(args, &option))
467 return 0;
468 uopt->uid = option;
469 uopt->flags |= (1 << UDF_FLAG_UID_SET);
470 break;
471 case Opt_umask:
472 if (match_octal(args, &option))
473 return 0;
474 uopt->umask = option;
475 break;
476 case Opt_nostrict:
477 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
478 break;
479 case Opt_session:
480 if (match_int(args, &option))
481 return 0;
482 uopt->session = option;
483 if (!remount)
484 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
485 break;
486 case Opt_lastblock:
487 if (match_int(args, &option))
488 return 0;
489 uopt->lastblock = option;
490 if (!remount)
491 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
492 break;
493 case Opt_anchor:
494 if (match_int(args, &option))
495 return 0;
496 uopt->anchor = option;
497 break;
498 case Opt_volume:
499 if (match_int(args, &option))
500 return 0;
501 uopt->volume = option;
502 break;
503 case Opt_partition:
504 if (match_int(args, &option))
505 return 0;
506 uopt->partition = option;
507 break;
508 case Opt_fileset:
509 if (match_int(args, &option))
510 return 0;
511 uopt->fileset = option;
512 break;
513 case Opt_rootdir:
514 if (match_int(args, &option))
515 return 0;
516 uopt->rootdir = option;
517 break;
518 case Opt_utf8:
519 uopt->flags |= (1 << UDF_FLAG_UTF8);
520 break;
521#ifdef CONFIG_UDF_NLS
522 case Opt_iocharset:
523 uopt->nls_map = load_nls(args[0].from);
524 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
525 break;
526#endif
527 case Opt_uignore:
528 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
529 break;
530 case Opt_uforget:
531 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
532 break;
533 case Opt_gignore:
534 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
535 break;
536 case Opt_gforget:
537 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
538 break;
539 case Opt_fmode:
540 if (match_octal(args, &option))
541 return 0;
542 uopt->fmode = option & 0777;
543 break;
544 case Opt_dmode:
545 if (match_octal(args, &option))
546 return 0;
547 uopt->dmode = option & 0777;
548 break;
549 default:
550 pr_err("bad mount option \"%s\" or missing value\n", p);
551 return 0;
552 }
553 }
554 return 1;
555}
556
557static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
558{
559 struct udf_options uopt;
560 struct udf_sb_info *sbi = UDF_SB(sb);
561 int error = 0;
562
563 uopt.flags = sbi->s_flags;
564 uopt.uid = sbi->s_uid;
565 uopt.gid = sbi->s_gid;
566 uopt.umask = sbi->s_umask;
567 uopt.fmode = sbi->s_fmode;
568 uopt.dmode = sbi->s_dmode;
569
570 if (!udf_parse_options(options, &uopt, true))
571 return -EINVAL;
572
573 write_lock(&sbi->s_cred_lock);
574 sbi->s_flags = uopt.flags;
575 sbi->s_uid = uopt.uid;
576 sbi->s_gid = uopt.gid;
577 sbi->s_umask = uopt.umask;
578 sbi->s_fmode = uopt.fmode;
579 sbi->s_dmode = uopt.dmode;
580 write_unlock(&sbi->s_cred_lock);
581
582 if (sbi->s_lvid_bh) {
583 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
584 if (write_rev > UDF_MAX_WRITE_VERSION)
585 *flags |= MS_RDONLY;
586 }
587
588 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
589 goto out_unlock;
590
591 if (*flags & MS_RDONLY)
592 udf_close_lvid(sb);
593 else
594 udf_open_lvid(sb);
595
596out_unlock:
597 return error;
598}
599
600/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
601/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
602static loff_t udf_check_vsd(struct super_block *sb)
603{
604 struct volStructDesc *vsd = NULL;
605 loff_t sector = 32768;
606 int sectorsize;
607 struct buffer_head *bh = NULL;
608 int nsr02 = 0;
609 int nsr03 = 0;
610 struct udf_sb_info *sbi;
611
612 sbi = UDF_SB(sb);
613 if (sb->s_blocksize < sizeof(struct volStructDesc))
614 sectorsize = sizeof(struct volStructDesc);
615 else
616 sectorsize = sb->s_blocksize;
617
618 sector += (sbi->s_session << sb->s_blocksize_bits);
619
620 udf_debug("Starting at sector %u (%ld byte sectors)\n",
621 (unsigned int)(sector >> sb->s_blocksize_bits),
622 sb->s_blocksize);
623 /* Process the sequence (if applicable) */
624 for (; !nsr02 && !nsr03; sector += sectorsize) {
625 /* Read a block */
626 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
627 if (!bh)
628 break;
629
630 /* Look for ISO descriptors */
631 vsd = (struct volStructDesc *)(bh->b_data +
632 (sector & (sb->s_blocksize - 1)));
633
634 if (vsd->stdIdent[0] == 0) {
635 brelse(bh);
636 break;
637 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
638 VSD_STD_ID_LEN)) {
639 switch (vsd->structType) {
640 case 0:
641 udf_debug("ISO9660 Boot Record found\n");
642 break;
643 case 1:
644 udf_debug("ISO9660 Primary Volume Descriptor found\n");
645 break;
646 case 2:
647 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
648 break;
649 case 3:
650 udf_debug("ISO9660 Volume Partition Descriptor found\n");
651 break;
652 case 255:
653 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
654 break;
655 default:
656 udf_debug("ISO9660 VRS (%u) found\n",
657 vsd->structType);
658 break;
659 }
660 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
661 VSD_STD_ID_LEN))
662 ; /* nothing */
663 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
664 VSD_STD_ID_LEN)) {
665 brelse(bh);
666 break;
667 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
668 VSD_STD_ID_LEN))
669 nsr02 = sector;
670 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
671 VSD_STD_ID_LEN))
672 nsr03 = sector;
673 brelse(bh);
674 }
675
676 if (nsr03)
677 return nsr03;
678 else if (nsr02)
679 return nsr02;
680 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
681 return -1;
682 else
683 return 0;
684}
685
686static int udf_find_fileset(struct super_block *sb,
687 struct kernel_lb_addr *fileset,
688 struct kernel_lb_addr *root)
689{
690 struct buffer_head *bh = NULL;
691 long lastblock;
692 uint16_t ident;
693 struct udf_sb_info *sbi;
694
695 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
696 fileset->partitionReferenceNum != 0xFFFF) {
697 bh = udf_read_ptagged(sb, fileset, 0, &ident);
698
699 if (!bh) {
700 return 1;
701 } else if (ident != TAG_IDENT_FSD) {
702 brelse(bh);
703 return 1;
704 }
705
706 }
707
708 sbi = UDF_SB(sb);
709 if (!bh) {
710 /* Search backwards through the partitions */
711 struct kernel_lb_addr newfileset;
712
713/* --> cvg: FIXME - is it reasonable? */
714 return 1;
715
716 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
717 (newfileset.partitionReferenceNum != 0xFFFF &&
718 fileset->logicalBlockNum == 0xFFFFFFFF &&
719 fileset->partitionReferenceNum == 0xFFFF);
720 newfileset.partitionReferenceNum--) {
721 lastblock = sbi->s_partmaps
722 [newfileset.partitionReferenceNum]
723 .s_partition_len;
724 newfileset.logicalBlockNum = 0;
725
726 do {
727 bh = udf_read_ptagged(sb, &newfileset, 0,
728 &ident);
729 if (!bh) {
730 newfileset.logicalBlockNum++;
731 continue;
732 }
733
734 switch (ident) {
735 case TAG_IDENT_SBD:
736 {
737 struct spaceBitmapDesc *sp;
738 sp = (struct spaceBitmapDesc *)
739 bh->b_data;
740 newfileset.logicalBlockNum += 1 +
741 ((le32_to_cpu(sp->numOfBytes) +
742 sizeof(struct spaceBitmapDesc)
743 - 1) >> sb->s_blocksize_bits);
744 brelse(bh);
745 break;
746 }
747 case TAG_IDENT_FSD:
748 *fileset = newfileset;
749 break;
750 default:
751 newfileset.logicalBlockNum++;
752 brelse(bh);
753 bh = NULL;
754 break;
755 }
756 } while (newfileset.logicalBlockNum < lastblock &&
757 fileset->logicalBlockNum == 0xFFFFFFFF &&
758 fileset->partitionReferenceNum == 0xFFFF);
759 }
760 }
761
762 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
763 fileset->partitionReferenceNum != 0xFFFF) && bh) {
764 udf_debug("Fileset at block=%d, partition=%d\n",
765 fileset->logicalBlockNum,
766 fileset->partitionReferenceNum);
767
768 sbi->s_partition = fileset->partitionReferenceNum;
769 udf_load_fileset(sb, bh, root);
770 brelse(bh);
771 return 0;
772 }
773 return 1;
774}
775
776static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
777{
778 struct primaryVolDesc *pvoldesc;
779 struct ustr *instr, *outstr;
780 struct buffer_head *bh;
781 uint16_t ident;
782 int ret = 1;
783
784 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
785 if (!instr)
786 return 1;
787
788 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
789 if (!outstr)
790 goto out1;
791
792 bh = udf_read_tagged(sb, block, block, &ident);
793 if (!bh)
794 goto out2;
795
796 BUG_ON(ident != TAG_IDENT_PVD);
797
798 pvoldesc = (struct primaryVolDesc *)bh->b_data;
799
800 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
801 pvoldesc->recordingDateAndTime)) {
802#ifdef UDFFS_DEBUG
803 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
804 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
805 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
806 ts->minute, le16_to_cpu(ts->typeAndTimezone));
807#endif
808 }
809
810 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
811 if (udf_CS0toUTF8(outstr, instr)) {
812 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
813 outstr->u_len > 31 ? 31 : outstr->u_len);
814 udf_debug("volIdent[] = '%s'\n",
815 UDF_SB(sb)->s_volume_ident);
816 }
817
818 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
819 if (udf_CS0toUTF8(outstr, instr))
820 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
821
822 brelse(bh);
823 ret = 0;
824out2:
825 kfree(outstr);
826out1:
827 kfree(instr);
828 return ret;
829}
830
831struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
832 u32 meta_file_loc, u32 partition_num)
833{
834 struct kernel_lb_addr addr;
835 struct inode *metadata_fe;
836
837 addr.logicalBlockNum = meta_file_loc;
838 addr.partitionReferenceNum = partition_num;
839
840 metadata_fe = udf_iget(sb, &addr);
841
842 if (metadata_fe == NULL)
843 udf_warn(sb, "metadata inode efe not found\n");
844 else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
845 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
846 iput(metadata_fe);
847 metadata_fe = NULL;
848 }
849
850 return metadata_fe;
851}
852
853static int udf_load_metadata_files(struct super_block *sb, int partition)
854{
855 struct udf_sb_info *sbi = UDF_SB(sb);
856 struct udf_part_map *map;
857 struct udf_meta_data *mdata;
858 struct kernel_lb_addr addr;
859
860 map = &sbi->s_partmaps[partition];
861 mdata = &map->s_type_specific.s_metadata;
862
863 /* metadata address */
864 udf_debug("Metadata file location: block = %d part = %d\n",
865 mdata->s_meta_file_loc, map->s_partition_num);
866
867 mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
868 mdata->s_meta_file_loc, map->s_partition_num);
869
870 if (mdata->s_metadata_fe == NULL) {
871 /* mirror file entry */
872 udf_debug("Mirror metadata file location: block = %d part = %d\n",
873 mdata->s_mirror_file_loc, map->s_partition_num);
874
875 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
876 mdata->s_mirror_file_loc, map->s_partition_num);
877
878 if (mdata->s_mirror_fe == NULL) {
879 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
880 goto error_exit;
881 }
882 }
883
884 /*
885 * bitmap file entry
886 * Note:
887 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
888 */
889 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
890 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
891 addr.partitionReferenceNum = map->s_partition_num;
892
893 udf_debug("Bitmap file location: block = %d part = %d\n",
894 addr.logicalBlockNum, addr.partitionReferenceNum);
895
896 mdata->s_bitmap_fe = udf_iget(sb, &addr);
897
898 if (mdata->s_bitmap_fe == NULL) {
899 if (sb->s_flags & MS_RDONLY)
900 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
901 else {
902 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
903 goto error_exit;
904 }
905 }
906 }
907
908 udf_debug("udf_load_metadata_files Ok\n");
909
910 return 0;
911
912error_exit:
913 return 1;
914}
915
916static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
917 struct kernel_lb_addr *root)
918{
919 struct fileSetDesc *fset;
920
921 fset = (struct fileSetDesc *)bh->b_data;
922
923 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
924
925 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
926
927 udf_debug("Rootdir at block=%d, partition=%d\n",
928 root->logicalBlockNum, root->partitionReferenceNum);
929}
930
931int udf_compute_nr_groups(struct super_block *sb, u32 partition)
932{
933 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
934 return DIV_ROUND_UP(map->s_partition_len +
935 (sizeof(struct spaceBitmapDesc) << 3),
936 sb->s_blocksize * 8);
937}
938
939static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
940{
941 struct udf_bitmap *bitmap;
942 int nr_groups;
943 int size;
944
945 nr_groups = udf_compute_nr_groups(sb, index);
946 size = sizeof(struct udf_bitmap) +
947 (sizeof(struct buffer_head *) * nr_groups);
948
949 if (size <= PAGE_SIZE)
950 bitmap = kzalloc(size, GFP_KERNEL);
951 else
952 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
953
954 if (bitmap == NULL)
955 return NULL;
956
957 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
958 bitmap->s_nr_groups = nr_groups;
959 return bitmap;
960}
961
962static int udf_fill_partdesc_info(struct super_block *sb,
963 struct partitionDesc *p, int p_index)
964{
965 struct udf_part_map *map;
966 struct udf_sb_info *sbi = UDF_SB(sb);
967 struct partitionHeaderDesc *phd;
968
969 map = &sbi->s_partmaps[p_index];
970
971 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
972 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
973
974 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
975 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
976 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
977 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
978 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
979 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
980 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
981 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
982
983 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
984 p_index, map->s_partition_type,
985 map->s_partition_root, map->s_partition_len);
986
987 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
988 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
989 return 0;
990
991 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
992 if (phd->unallocSpaceTable.extLength) {
993 struct kernel_lb_addr loc = {
994 .logicalBlockNum = le32_to_cpu(
995 phd->unallocSpaceTable.extPosition),
996 .partitionReferenceNum = p_index,
997 };
998
999 map->s_uspace.s_table = udf_iget(sb, &loc);
1000 if (!map->s_uspace.s_table) {
1001 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1002 p_index);
1003 return 1;
1004 }
1005 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1006 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1007 p_index, map->s_uspace.s_table->i_ino);
1008 }
1009
1010 if (phd->unallocSpaceBitmap.extLength) {
1011 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1012 if (!bitmap)
1013 return 1;
1014 map->s_uspace.s_bitmap = bitmap;
1015 bitmap->s_extLength = le32_to_cpu(
1016 phd->unallocSpaceBitmap.extLength);
1017 bitmap->s_extPosition = le32_to_cpu(
1018 phd->unallocSpaceBitmap.extPosition);
1019 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1020 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1021 p_index, bitmap->s_extPosition);
1022 }
1023
1024 if (phd->partitionIntegrityTable.extLength)
1025 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1026
1027 if (phd->freedSpaceTable.extLength) {
1028 struct kernel_lb_addr loc = {
1029 .logicalBlockNum = le32_to_cpu(
1030 phd->freedSpaceTable.extPosition),
1031 .partitionReferenceNum = p_index,
1032 };
1033
1034 map->s_fspace.s_table = udf_iget(sb, &loc);
1035 if (!map->s_fspace.s_table) {
1036 udf_debug("cannot load freedSpaceTable (part %d)\n",
1037 p_index);
1038 return 1;
1039 }
1040
1041 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1042 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1043 p_index, map->s_fspace.s_table->i_ino);
1044 }
1045
1046 if (phd->freedSpaceBitmap.extLength) {
1047 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1048 if (!bitmap)
1049 return 1;
1050 map->s_fspace.s_bitmap = bitmap;
1051 bitmap->s_extLength = le32_to_cpu(
1052 phd->freedSpaceBitmap.extLength);
1053 bitmap->s_extPosition = le32_to_cpu(
1054 phd->freedSpaceBitmap.extPosition);
1055 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1056 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1057 p_index, bitmap->s_extPosition);
1058 }
1059 return 0;
1060}
1061
1062static void udf_find_vat_block(struct super_block *sb, int p_index,
1063 int type1_index, sector_t start_block)
1064{
1065 struct udf_sb_info *sbi = UDF_SB(sb);
1066 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1067 sector_t vat_block;
1068 struct kernel_lb_addr ino;
1069
1070 /*
1071 * VAT file entry is in the last recorded block. Some broken disks have
1072 * it a few blocks before so try a bit harder...
1073 */
1074 ino.partitionReferenceNum = type1_index;
1075 for (vat_block = start_block;
1076 vat_block >= map->s_partition_root &&
1077 vat_block >= start_block - 3 &&
1078 !sbi->s_vat_inode; vat_block--) {
1079 ino.logicalBlockNum = vat_block - map->s_partition_root;
1080 sbi->s_vat_inode = udf_iget(sb, &ino);
1081 }
1082}
1083
1084static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1085{
1086 struct udf_sb_info *sbi = UDF_SB(sb);
1087 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1088 struct buffer_head *bh = NULL;
1089 struct udf_inode_info *vati;
1090 uint32_t pos;
1091 struct virtualAllocationTable20 *vat20;
1092 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1093
1094 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1095 if (!sbi->s_vat_inode &&
1096 sbi->s_last_block != blocks - 1) {
1097 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1098 (unsigned long)sbi->s_last_block,
1099 (unsigned long)blocks - 1);
1100 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1101 }
1102 if (!sbi->s_vat_inode)
1103 return 1;
1104
1105 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1106 map->s_type_specific.s_virtual.s_start_offset = 0;
1107 map->s_type_specific.s_virtual.s_num_entries =
1108 (sbi->s_vat_inode->i_size - 36) >> 2;
1109 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1110 vati = UDF_I(sbi->s_vat_inode);
1111 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1112 pos = udf_block_map(sbi->s_vat_inode, 0);
1113 bh = sb_bread(sb, pos);
1114 if (!bh)
1115 return 1;
1116 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1117 } else {
1118 vat20 = (struct virtualAllocationTable20 *)
1119 vati->i_ext.i_data;
1120 }
1121
1122 map->s_type_specific.s_virtual.s_start_offset =
1123 le16_to_cpu(vat20->lengthHeader);
1124 map->s_type_specific.s_virtual.s_num_entries =
1125 (sbi->s_vat_inode->i_size -
1126 map->s_type_specific.s_virtual.
1127 s_start_offset) >> 2;
1128 brelse(bh);
1129 }
1130 return 0;
1131}
1132
1133static int udf_load_partdesc(struct super_block *sb, sector_t block)
1134{
1135 struct buffer_head *bh;
1136 struct partitionDesc *p;
1137 struct udf_part_map *map;
1138 struct udf_sb_info *sbi = UDF_SB(sb);
1139 int i, type1_idx;
1140 uint16_t partitionNumber;
1141 uint16_t ident;
1142 int ret = 0;
1143
1144 bh = udf_read_tagged(sb, block, block, &ident);
1145 if (!bh)
1146 return 1;
1147 if (ident != TAG_IDENT_PD)
1148 goto out_bh;
1149
1150 p = (struct partitionDesc *)bh->b_data;
1151 partitionNumber = le16_to_cpu(p->partitionNumber);
1152
1153 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1154 for (i = 0; i < sbi->s_partitions; i++) {
1155 map = &sbi->s_partmaps[i];
1156 udf_debug("Searching map: (%d == %d)\n",
1157 map->s_partition_num, partitionNumber);
1158 if (map->s_partition_num == partitionNumber &&
1159 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1160 map->s_partition_type == UDF_SPARABLE_MAP15))
1161 break;
1162 }
1163
1164 if (i >= sbi->s_partitions) {
1165 udf_debug("Partition (%d) not found in partition map\n",
1166 partitionNumber);
1167 goto out_bh;
1168 }
1169
1170 ret = udf_fill_partdesc_info(sb, p, i);
1171
1172 /*
1173 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1174 * PHYSICAL partitions are already set up
1175 */
1176 type1_idx = i;
1177 for (i = 0; i < sbi->s_partitions; i++) {
1178 map = &sbi->s_partmaps[i];
1179
1180 if (map->s_partition_num == partitionNumber &&
1181 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1182 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1183 map->s_partition_type == UDF_METADATA_MAP25))
1184 break;
1185 }
1186
1187 if (i >= sbi->s_partitions)
1188 goto out_bh;
1189
1190 ret = udf_fill_partdesc_info(sb, p, i);
1191 if (ret)
1192 goto out_bh;
1193
1194 if (map->s_partition_type == UDF_METADATA_MAP25) {
1195 ret = udf_load_metadata_files(sb, i);
1196 if (ret) {
1197 udf_err(sb, "error loading MetaData partition map %d\n",
1198 i);
1199 goto out_bh;
1200 }
1201 } else {
1202 ret = udf_load_vat(sb, i, type1_idx);
1203 if (ret)
1204 goto out_bh;
1205 /*
1206 * Mark filesystem read-only if we have a partition with
1207 * virtual map since we don't handle writing to it (we
1208 * overwrite blocks instead of relocating them).
1209 */
1210 sb->s_flags |= MS_RDONLY;
1211 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1212 }
1213out_bh:
1214 /* In case loading failed, we handle cleanup in udf_fill_super */
1215 brelse(bh);
1216 return ret;
1217}
1218
1219static int udf_load_sparable_map(struct super_block *sb,
1220 struct udf_part_map *map,
1221 struct sparablePartitionMap *spm)
1222{
1223 uint32_t loc;
1224 uint16_t ident;
1225 struct sparingTable *st;
1226 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1227 int i;
1228 struct buffer_head *bh;
1229
1230 map->s_partition_type = UDF_SPARABLE_MAP15;
1231 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1232 if (!is_power_of_2(sdata->s_packet_len)) {
1233 udf_err(sb, "error loading logical volume descriptor: "
1234 "Invalid packet length %u\n",
1235 (unsigned)sdata->s_packet_len);
1236 return -EIO;
1237 }
1238 if (spm->numSparingTables > 4) {
1239 udf_err(sb, "error loading logical volume descriptor: "
1240 "Too many sparing tables (%d)\n",
1241 (int)spm->numSparingTables);
1242 return -EIO;
1243 }
1244
1245 for (i = 0; i < spm->numSparingTables; i++) {
1246 loc = le32_to_cpu(spm->locSparingTable[i]);
1247 bh = udf_read_tagged(sb, loc, loc, &ident);
1248 if (!bh)
1249 continue;
1250
1251 st = (struct sparingTable *)bh->b_data;
1252 if (ident != 0 ||
1253 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1254 strlen(UDF_ID_SPARING)) ||
1255 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1256 sb->s_blocksize) {
1257 brelse(bh);
1258 continue;
1259 }
1260
1261 sdata->s_spar_map[i] = bh;
1262 }
1263 map->s_partition_func = udf_get_pblock_spar15;
1264 return 0;
1265}
1266
1267static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1268 struct kernel_lb_addr *fileset)
1269{
1270 struct logicalVolDesc *lvd;
1271 int i, offset;
1272 uint8_t type;
1273 struct udf_sb_info *sbi = UDF_SB(sb);
1274 struct genericPartitionMap *gpm;
1275 uint16_t ident;
1276 struct buffer_head *bh;
1277 unsigned int table_len;
1278 int ret = 0;
1279
1280 bh = udf_read_tagged(sb, block, block, &ident);
1281 if (!bh)
1282 return 1;
1283 BUG_ON(ident != TAG_IDENT_LVD);
1284 lvd = (struct logicalVolDesc *)bh->b_data;
1285 table_len = le32_to_cpu(lvd->mapTableLength);
1286 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1287 udf_err(sb, "error loading logical volume descriptor: "
1288 "Partition table too long (%u > %lu)\n", table_len,
1289 sb->s_blocksize - sizeof(*lvd));
1290 goto out_bh;
1291 }
1292
1293 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1294 if (ret)
1295 goto out_bh;
1296
1297 for (i = 0, offset = 0;
1298 i < sbi->s_partitions && offset < table_len;
1299 i++, offset += gpm->partitionMapLength) {
1300 struct udf_part_map *map = &sbi->s_partmaps[i];
1301 gpm = (struct genericPartitionMap *)
1302 &(lvd->partitionMaps[offset]);
1303 type = gpm->partitionMapType;
1304 if (type == 1) {
1305 struct genericPartitionMap1 *gpm1 =
1306 (struct genericPartitionMap1 *)gpm;
1307 map->s_partition_type = UDF_TYPE1_MAP15;
1308 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1309 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1310 map->s_partition_func = NULL;
1311 } else if (type == 2) {
1312 struct udfPartitionMap2 *upm2 =
1313 (struct udfPartitionMap2 *)gpm;
1314 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1315 strlen(UDF_ID_VIRTUAL))) {
1316 u16 suf =
1317 le16_to_cpu(((__le16 *)upm2->partIdent.
1318 identSuffix)[0]);
1319 if (suf < 0x0200) {
1320 map->s_partition_type =
1321 UDF_VIRTUAL_MAP15;
1322 map->s_partition_func =
1323 udf_get_pblock_virt15;
1324 } else {
1325 map->s_partition_type =
1326 UDF_VIRTUAL_MAP20;
1327 map->s_partition_func =
1328 udf_get_pblock_virt20;
1329 }
1330 } else if (!strncmp(upm2->partIdent.ident,
1331 UDF_ID_SPARABLE,
1332 strlen(UDF_ID_SPARABLE))) {
1333 if (udf_load_sparable_map(sb, map,
1334 (struct sparablePartitionMap *)gpm) < 0)
1335 goto out_bh;
1336 } else if (!strncmp(upm2->partIdent.ident,
1337 UDF_ID_METADATA,
1338 strlen(UDF_ID_METADATA))) {
1339 struct udf_meta_data *mdata =
1340 &map->s_type_specific.s_metadata;
1341 struct metadataPartitionMap *mdm =
1342 (struct metadataPartitionMap *)
1343 &(lvd->partitionMaps[offset]);
1344 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1345 i, type, UDF_ID_METADATA);
1346
1347 map->s_partition_type = UDF_METADATA_MAP25;
1348 map->s_partition_func = udf_get_pblock_meta25;
1349
1350 mdata->s_meta_file_loc =
1351 le32_to_cpu(mdm->metadataFileLoc);
1352 mdata->s_mirror_file_loc =
1353 le32_to_cpu(mdm->metadataMirrorFileLoc);
1354 mdata->s_bitmap_file_loc =
1355 le32_to_cpu(mdm->metadataBitmapFileLoc);
1356 mdata->s_alloc_unit_size =
1357 le32_to_cpu(mdm->allocUnitSize);
1358 mdata->s_align_unit_size =
1359 le16_to_cpu(mdm->alignUnitSize);
1360 if (mdm->flags & 0x01)
1361 mdata->s_flags |= MF_DUPLICATE_MD;
1362
1363 udf_debug("Metadata Ident suffix=0x%x\n",
1364 le16_to_cpu(*(__le16 *)
1365 mdm->partIdent.identSuffix));
1366 udf_debug("Metadata part num=%d\n",
1367 le16_to_cpu(mdm->partitionNum));
1368 udf_debug("Metadata part alloc unit size=%d\n",
1369 le32_to_cpu(mdm->allocUnitSize));
1370 udf_debug("Metadata file loc=%d\n",
1371 le32_to_cpu(mdm->metadataFileLoc));
1372 udf_debug("Mirror file loc=%d\n",
1373 le32_to_cpu(mdm->metadataMirrorFileLoc));
1374 udf_debug("Bitmap file loc=%d\n",
1375 le32_to_cpu(mdm->metadataBitmapFileLoc));
1376 udf_debug("Flags: %d %d\n",
1377 mdata->s_flags, mdm->flags);
1378 } else {
1379 udf_debug("Unknown ident: %s\n",
1380 upm2->partIdent.ident);
1381 continue;
1382 }
1383 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1384 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1385 }
1386 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1387 i, map->s_partition_num, type, map->s_volumeseqnum);
1388 }
1389
1390 if (fileset) {
1391 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1392
1393 *fileset = lelb_to_cpu(la->extLocation);
1394 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1395 fileset->logicalBlockNum,
1396 fileset->partitionReferenceNum);
1397 }
1398 if (lvd->integritySeqExt.extLength)
1399 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1400
1401out_bh:
1402 brelse(bh);
1403 return ret;
1404}
1405
1406/*
1407 * udf_load_logicalvolint
1408 *
1409 */
1410static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1411{
1412 struct buffer_head *bh = NULL;
1413 uint16_t ident;
1414 struct udf_sb_info *sbi = UDF_SB(sb);
1415 struct logicalVolIntegrityDesc *lvid;
1416
1417 while (loc.extLength > 0 &&
1418 (bh = udf_read_tagged(sb, loc.extLocation,
1419 loc.extLocation, &ident)) &&
1420 ident == TAG_IDENT_LVID) {
1421 sbi->s_lvid_bh = bh;
1422 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1423
1424 if (lvid->nextIntegrityExt.extLength)
1425 udf_load_logicalvolint(sb,
1426 leea_to_cpu(lvid->nextIntegrityExt));
1427
1428 if (sbi->s_lvid_bh != bh)
1429 brelse(bh);
1430 loc.extLength -= sb->s_blocksize;
1431 loc.extLocation++;
1432 }
1433 if (sbi->s_lvid_bh != bh)
1434 brelse(bh);
1435}
1436
1437/*
1438 * udf_process_sequence
1439 *
1440 * PURPOSE
1441 * Process a main/reserve volume descriptor sequence.
1442 *
1443 * PRE-CONDITIONS
1444 * sb Pointer to _locked_ superblock.
1445 * block First block of first extent of the sequence.
1446 * lastblock Lastblock of first extent of the sequence.
1447 *
1448 * HISTORY
1449 * July 1, 1997 - Andrew E. Mileski
1450 * Written, tested, and released.
1451 */
1452static noinline int udf_process_sequence(struct super_block *sb, long block,
1453 long lastblock, struct kernel_lb_addr *fileset)
1454{
1455 struct buffer_head *bh = NULL;
1456 struct udf_vds_record vds[VDS_POS_LENGTH];
1457 struct udf_vds_record *curr;
1458 struct generic_desc *gd;
1459 struct volDescPtr *vdp;
1460 int done = 0;
1461 uint32_t vdsn;
1462 uint16_t ident;
1463 long next_s = 0, next_e = 0;
1464
1465 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1466
1467 /*
1468 * Read the main descriptor sequence and find which descriptors
1469 * are in it.
1470 */
1471 for (; (!done && block <= lastblock); block++) {
1472
1473 bh = udf_read_tagged(sb, block, block, &ident);
1474 if (!bh) {
1475 udf_err(sb,
1476 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1477 (unsigned long long)block);
1478 return 1;
1479 }
1480
1481 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1482 gd = (struct generic_desc *)bh->b_data;
1483 vdsn = le32_to_cpu(gd->volDescSeqNum);
1484 switch (ident) {
1485 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1486 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1487 if (vdsn >= curr->volDescSeqNum) {
1488 curr->volDescSeqNum = vdsn;
1489 curr->block = block;
1490 }
1491 break;
1492 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1493 curr = &vds[VDS_POS_VOL_DESC_PTR];
1494 if (vdsn >= curr->volDescSeqNum) {
1495 curr->volDescSeqNum = vdsn;
1496 curr->block = block;
1497
1498 vdp = (struct volDescPtr *)bh->b_data;
1499 next_s = le32_to_cpu(
1500 vdp->nextVolDescSeqExt.extLocation);
1501 next_e = le32_to_cpu(
1502 vdp->nextVolDescSeqExt.extLength);
1503 next_e = next_e >> sb->s_blocksize_bits;
1504 next_e += next_s;
1505 }
1506 break;
1507 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1508 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1509 if (vdsn >= curr->volDescSeqNum) {
1510 curr->volDescSeqNum = vdsn;
1511 curr->block = block;
1512 }
1513 break;
1514 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1515 curr = &vds[VDS_POS_PARTITION_DESC];
1516 if (!curr->block)
1517 curr->block = block;
1518 break;
1519 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1520 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1521 if (vdsn >= curr->volDescSeqNum) {
1522 curr->volDescSeqNum = vdsn;
1523 curr->block = block;
1524 }
1525 break;
1526 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1527 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1528 if (vdsn >= curr->volDescSeqNum) {
1529 curr->volDescSeqNum = vdsn;
1530 curr->block = block;
1531 }
1532 break;
1533 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1534 vds[VDS_POS_TERMINATING_DESC].block = block;
1535 if (next_e) {
1536 block = next_s;
1537 lastblock = next_e;
1538 next_s = next_e = 0;
1539 } else
1540 done = 1;
1541 break;
1542 }
1543 brelse(bh);
1544 }
1545 /*
1546 * Now read interesting descriptors again and process them
1547 * in a suitable order
1548 */
1549 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1550 udf_err(sb, "Primary Volume Descriptor not found!\n");
1551 return 1;
1552 }
1553 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1554 return 1;
1555
1556 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1557 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1558 return 1;
1559
1560 if (vds[VDS_POS_PARTITION_DESC].block) {
1561 /*
1562 * We rescan the whole descriptor sequence to find
1563 * partition descriptor blocks and process them.
1564 */
1565 for (block = vds[VDS_POS_PARTITION_DESC].block;
1566 block < vds[VDS_POS_TERMINATING_DESC].block;
1567 block++)
1568 if (udf_load_partdesc(sb, block))
1569 return 1;
1570 }
1571
1572 return 0;
1573}
1574
1575static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1576 struct kernel_lb_addr *fileset)
1577{
1578 struct anchorVolDescPtr *anchor;
1579 long main_s, main_e, reserve_s, reserve_e;
1580
1581 anchor = (struct anchorVolDescPtr *)bh->b_data;
1582
1583 /* Locate the main sequence */
1584 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1585 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1586 main_e = main_e >> sb->s_blocksize_bits;
1587 main_e += main_s;
1588
1589 /* Locate the reserve sequence */
1590 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1591 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1592 reserve_e = reserve_e >> sb->s_blocksize_bits;
1593 reserve_e += reserve_s;
1594
1595 /* Process the main & reserve sequences */
1596 /* responsible for finding the PartitionDesc(s) */
1597 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1598 return 1;
1599 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1600}
1601
1602/*
1603 * Check whether there is an anchor block in the given block and
1604 * load Volume Descriptor Sequence if so.
1605 */
1606static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1607 struct kernel_lb_addr *fileset)
1608{
1609 struct buffer_head *bh;
1610 uint16_t ident;
1611 int ret;
1612
1613 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1614 udf_fixed_to_variable(block) >=
1615 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1616 return 0;
1617
1618 bh = udf_read_tagged(sb, block, block, &ident);
1619 if (!bh)
1620 return 0;
1621 if (ident != TAG_IDENT_AVDP) {
1622 brelse(bh);
1623 return 0;
1624 }
1625 ret = udf_load_sequence(sb, bh, fileset);
1626 brelse(bh);
1627 return ret;
1628}
1629
1630/* Search for an anchor volume descriptor pointer */
1631static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1632 struct kernel_lb_addr *fileset)
1633{
1634 sector_t last[6];
1635 int i;
1636 struct udf_sb_info *sbi = UDF_SB(sb);
1637 int last_count = 0;
1638
1639 /* First try user provided anchor */
1640 if (sbi->s_anchor) {
1641 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1642 return lastblock;
1643 }
1644 /*
1645 * according to spec, anchor is in either:
1646 * block 256
1647 * lastblock-256
1648 * lastblock
1649 * however, if the disc isn't closed, it could be 512.
1650 */
1651 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1652 return lastblock;
1653 /*
1654 * The trouble is which block is the last one. Drives often misreport
1655 * this so we try various possibilities.
1656 */
1657 last[last_count++] = lastblock;
1658 if (lastblock >= 1)
1659 last[last_count++] = lastblock - 1;
1660 last[last_count++] = lastblock + 1;
1661 if (lastblock >= 2)
1662 last[last_count++] = lastblock - 2;
1663 if (lastblock >= 150)
1664 last[last_count++] = lastblock - 150;
1665 if (lastblock >= 152)
1666 last[last_count++] = lastblock - 152;
1667
1668 for (i = 0; i < last_count; i++) {
1669 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1670 sb->s_blocksize_bits)
1671 continue;
1672 if (udf_check_anchor_block(sb, last[i], fileset))
1673 return last[i];
1674 if (last[i] < 256)
1675 continue;
1676 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1677 return last[i];
1678 }
1679
1680 /* Finally try block 512 in case media is open */
1681 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1682 return last[0];
1683 return 0;
1684}
1685
1686/*
1687 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1688 * area specified by it. The function expects sbi->s_lastblock to be the last
1689 * block on the media.
1690 *
1691 * Return 1 if ok, 0 if not found.
1692 *
1693 */
1694static int udf_find_anchor(struct super_block *sb,
1695 struct kernel_lb_addr *fileset)
1696{
1697 sector_t lastblock;
1698 struct udf_sb_info *sbi = UDF_SB(sb);
1699
1700 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1701 if (lastblock)
1702 goto out;
1703
1704 /* No anchor found? Try VARCONV conversion of block numbers */
1705 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1706 /* Firstly, we try to not convert number of the last block */
1707 lastblock = udf_scan_anchors(sb,
1708 udf_variable_to_fixed(sbi->s_last_block),
1709 fileset);
1710 if (lastblock)
1711 goto out;
1712
1713 /* Secondly, we try with converted number of the last block */
1714 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1715 if (!lastblock) {
1716 /* VARCONV didn't help. Clear it. */
1717 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1718 return 0;
1719 }
1720out:
1721 sbi->s_last_block = lastblock;
1722 return 1;
1723}
1724
1725/*
1726 * Check Volume Structure Descriptor, find Anchor block and load Volume
1727 * Descriptor Sequence
1728 */
1729static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1730 int silent, struct kernel_lb_addr *fileset)
1731{
1732 struct udf_sb_info *sbi = UDF_SB(sb);
1733 loff_t nsr_off;
1734
1735 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1736 if (!silent)
1737 udf_warn(sb, "Bad block size\n");
1738 return 0;
1739 }
1740 sbi->s_last_block = uopt->lastblock;
1741 if (!uopt->novrs) {
1742 /* Check that it is NSR02 compliant */
1743 nsr_off = udf_check_vsd(sb);
1744 if (!nsr_off) {
1745 if (!silent)
1746 udf_warn(sb, "No VRS found\n");
1747 return 0;
1748 }
1749 if (nsr_off == -1)
1750 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1751 if (!sbi->s_last_block)
1752 sbi->s_last_block = udf_get_last_block(sb);
1753 } else {
1754 udf_debug("Validity check skipped because of novrs option\n");
1755 }
1756
1757 /* Look for anchor block and load Volume Descriptor Sequence */
1758 sbi->s_anchor = uopt->anchor;
1759 if (!udf_find_anchor(sb, fileset)) {
1760 if (!silent)
1761 udf_warn(sb, "No anchor found\n");
1762 return 0;
1763 }
1764 return 1;
1765}
1766
1767static void udf_open_lvid(struct super_block *sb)
1768{
1769 struct udf_sb_info *sbi = UDF_SB(sb);
1770 struct buffer_head *bh = sbi->s_lvid_bh;
1771 struct logicalVolIntegrityDesc *lvid;
1772 struct logicalVolIntegrityDescImpUse *lvidiu;
1773
1774 if (!bh)
1775 return;
1776
1777 mutex_lock(&sbi->s_alloc_mutex);
1778 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1779 lvidiu = udf_sb_lvidiu(sbi);
1780
1781 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1782 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1783 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1784 CURRENT_TIME);
1785 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1786
1787 lvid->descTag.descCRC = cpu_to_le16(
1788 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1789 le16_to_cpu(lvid->descTag.descCRCLength)));
1790
1791 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1792 mark_buffer_dirty(bh);
1793 sbi->s_lvid_dirty = 0;
1794 mutex_unlock(&sbi->s_alloc_mutex);
1795}
1796
1797static void udf_close_lvid(struct super_block *sb)
1798{
1799 struct udf_sb_info *sbi = UDF_SB(sb);
1800 struct buffer_head *bh = sbi->s_lvid_bh;
1801 struct logicalVolIntegrityDesc *lvid;
1802 struct logicalVolIntegrityDescImpUse *lvidiu;
1803
1804 if (!bh)
1805 return;
1806
1807 mutex_lock(&sbi->s_alloc_mutex);
1808 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1809 lvidiu = udf_sb_lvidiu(sbi);
1810 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1811 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1812 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1813 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1814 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1815 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1816 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1817 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1818 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1819 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1820
1821 lvid->descTag.descCRC = cpu_to_le16(
1822 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1823 le16_to_cpu(lvid->descTag.descCRCLength)));
1824
1825 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1826 /*
1827 * We set buffer uptodate unconditionally here to avoid spurious
1828 * warnings from mark_buffer_dirty() when previous EIO has marked
1829 * the buffer as !uptodate
1830 */
1831 set_buffer_uptodate(bh);
1832 mark_buffer_dirty(bh);
1833 sbi->s_lvid_dirty = 0;
1834 mutex_unlock(&sbi->s_alloc_mutex);
1835}
1836
1837u64 lvid_get_unique_id(struct super_block *sb)
1838{
1839 struct buffer_head *bh;
1840 struct udf_sb_info *sbi = UDF_SB(sb);
1841 struct logicalVolIntegrityDesc *lvid;
1842 struct logicalVolHeaderDesc *lvhd;
1843 u64 uniqueID;
1844 u64 ret;
1845
1846 bh = sbi->s_lvid_bh;
1847 if (!bh)
1848 return 0;
1849
1850 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1851 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1852
1853 mutex_lock(&sbi->s_alloc_mutex);
1854 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1855 if (!(++uniqueID & 0xFFFFFFFF))
1856 uniqueID += 16;
1857 lvhd->uniqueID = cpu_to_le64(uniqueID);
1858 mutex_unlock(&sbi->s_alloc_mutex);
1859 mark_buffer_dirty(bh);
1860
1861 return ret;
1862}
1863
1864static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1865{
1866 int i;
1867 int nr_groups = bitmap->s_nr_groups;
1868 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1869 nr_groups);
1870
1871 for (i = 0; i < nr_groups; i++)
1872 if (bitmap->s_block_bitmap[i])
1873 brelse(bitmap->s_block_bitmap[i]);
1874
1875 if (size <= PAGE_SIZE)
1876 kfree(bitmap);
1877 else
1878 vfree(bitmap);
1879}
1880
1881static void udf_free_partition(struct udf_part_map *map)
1882{
1883 int i;
1884 struct udf_meta_data *mdata;
1885
1886 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1887 iput(map->s_uspace.s_table);
1888 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1889 iput(map->s_fspace.s_table);
1890 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1891 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1892 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1893 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1894 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1895 for (i = 0; i < 4; i++)
1896 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1897 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1898 mdata = &map->s_type_specific.s_metadata;
1899 iput(mdata->s_metadata_fe);
1900 mdata->s_metadata_fe = NULL;
1901
1902 iput(mdata->s_mirror_fe);
1903 mdata->s_mirror_fe = NULL;
1904
1905 iput(mdata->s_bitmap_fe);
1906 mdata->s_bitmap_fe = NULL;
1907 }
1908}
1909
1910static int udf_fill_super(struct super_block *sb, void *options, int silent)
1911{
1912 int i;
1913 int ret;
1914 struct inode *inode = NULL;
1915 struct udf_options uopt;
1916 struct kernel_lb_addr rootdir, fileset;
1917 struct udf_sb_info *sbi;
1918
1919 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1920 uopt.uid = -1;
1921 uopt.gid = -1;
1922 uopt.umask = 0;
1923 uopt.fmode = UDF_INVALID_MODE;
1924 uopt.dmode = UDF_INVALID_MODE;
1925
1926 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1927 if (!sbi)
1928 return -ENOMEM;
1929
1930 sb->s_fs_info = sbi;
1931
1932 mutex_init(&sbi->s_alloc_mutex);
1933
1934 if (!udf_parse_options((char *)options, &uopt, false))
1935 goto error_out;
1936
1937 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1938 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1939 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1940 goto error_out;
1941 }
1942#ifdef CONFIG_UDF_NLS
1943 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1944 uopt.nls_map = load_nls_default();
1945 if (!uopt.nls_map)
1946 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1947 else
1948 udf_debug("Using default NLS map\n");
1949 }
1950#endif
1951 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1952 uopt.flags |= (1 << UDF_FLAG_UTF8);
1953
1954 fileset.logicalBlockNum = 0xFFFFFFFF;
1955 fileset.partitionReferenceNum = 0xFFFF;
1956
1957 sbi->s_flags = uopt.flags;
1958 sbi->s_uid = uopt.uid;
1959 sbi->s_gid = uopt.gid;
1960 sbi->s_umask = uopt.umask;
1961 sbi->s_fmode = uopt.fmode;
1962 sbi->s_dmode = uopt.dmode;
1963 sbi->s_nls_map = uopt.nls_map;
1964 rwlock_init(&sbi->s_cred_lock);
1965
1966 if (uopt.session == 0xFFFFFFFF)
1967 sbi->s_session = udf_get_last_session(sb);
1968 else
1969 sbi->s_session = uopt.session;
1970
1971 udf_debug("Multi-session=%d\n", sbi->s_session);
1972
1973 /* Fill in the rest of the superblock */
1974 sb->s_op = &udf_sb_ops;
1975 sb->s_export_op = &udf_export_ops;
1976
1977 sb->s_dirt = 0;
1978 sb->s_magic = UDF_SUPER_MAGIC;
1979 sb->s_time_gran = 1000;
1980
1981 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1982 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1983 } else {
1984 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1985 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1986 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1987 if (!silent)
1988 pr_notice("Rescanning with blocksize %d\n",
1989 UDF_DEFAULT_BLOCKSIZE);
1990 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1991 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1992 }
1993 }
1994 if (!ret) {
1995 udf_warn(sb, "No partition found (1)\n");
1996 goto error_out;
1997 }
1998
1999 udf_debug("Lastblock=%d\n", sbi->s_last_block);
2000
2001 if (sbi->s_lvid_bh) {
2002 struct logicalVolIntegrityDescImpUse *lvidiu =
2003 udf_sb_lvidiu(sbi);
2004 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2005 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2006 /* uint16_t maxUDFWriteRev =
2007 le16_to_cpu(lvidiu->maxUDFWriteRev); */
2008
2009 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2010 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2011 le16_to_cpu(lvidiu->minUDFReadRev),
2012 UDF_MAX_READ_VERSION);
2013 goto error_out;
2014 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
2015 sb->s_flags |= MS_RDONLY;
2016
2017 sbi->s_udfrev = minUDFWriteRev;
2018
2019 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2020 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2021 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2022 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2023 }
2024
2025 if (!sbi->s_partitions) {
2026 udf_warn(sb, "No partition found (2)\n");
2027 goto error_out;
2028 }
2029
2030 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2031 UDF_PART_FLAG_READ_ONLY) {
2032 pr_notice("Partition marked readonly; forcing readonly mount\n");
2033 sb->s_flags |= MS_RDONLY;
2034 }
2035
2036 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2037 udf_warn(sb, "No fileset found\n");
2038 goto error_out;
2039 }
2040
2041 if (!silent) {
2042 struct timestamp ts;
2043 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2044 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2045 sbi->s_volume_ident,
2046 le16_to_cpu(ts.year), ts.month, ts.day,
2047 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2048 }
2049 if (!(sb->s_flags & MS_RDONLY))
2050 udf_open_lvid(sb);
2051
2052 /* Assign the root inode */
2053 /* assign inodes by physical block number */
2054 /* perhaps it's not extensible enough, but for now ... */
2055 inode = udf_iget(sb, &rootdir);
2056 if (!inode) {
2057 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2058 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2059 goto error_out;
2060 }
2061
2062 /* Allocate a dentry for the root inode */
2063 sb->s_root = d_make_root(inode);
2064 if (!sb->s_root) {
2065 udf_err(sb, "Couldn't allocate root dentry\n");
2066 goto error_out;
2067 }
2068 sb->s_maxbytes = MAX_LFS_FILESIZE;
2069 sb->s_max_links = UDF_MAX_LINKS;
2070 return 0;
2071
2072error_out:
2073 if (sbi->s_vat_inode)
2074 iput(sbi->s_vat_inode);
2075 if (sbi->s_partitions)
2076 for (i = 0; i < sbi->s_partitions; i++)
2077 udf_free_partition(&sbi->s_partmaps[i]);
2078#ifdef CONFIG_UDF_NLS
2079 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2080 unload_nls(sbi->s_nls_map);
2081#endif
2082 if (!(sb->s_flags & MS_RDONLY))
2083 udf_close_lvid(sb);
2084 brelse(sbi->s_lvid_bh);
2085
2086 kfree(sbi->s_partmaps);
2087 kfree(sbi);
2088 sb->s_fs_info = NULL;
2089
2090 return -EINVAL;
2091}
2092
2093void _udf_err(struct super_block *sb, const char *function,
2094 const char *fmt, ...)
2095{
2096 struct va_format vaf;
2097 va_list args;
2098
2099 /* mark sb error */
2100 if (!(sb->s_flags & MS_RDONLY))
2101 sb->s_dirt = 1;
2102
2103 va_start(args, fmt);
2104
2105 vaf.fmt = fmt;
2106 vaf.va = &args;
2107
2108 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2109
2110 va_end(args);
2111}
2112
2113void _udf_warn(struct super_block *sb, const char *function,
2114 const char *fmt, ...)
2115{
2116 struct va_format vaf;
2117 va_list args;
2118
2119 va_start(args, fmt);
2120
2121 vaf.fmt = fmt;
2122 vaf.va = &args;
2123
2124 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2125
2126 va_end(args);
2127}
2128
2129static void udf_put_super(struct super_block *sb)
2130{
2131 int i;
2132 struct udf_sb_info *sbi;
2133
2134 sbi = UDF_SB(sb);
2135
2136 if (sbi->s_vat_inode)
2137 iput(sbi->s_vat_inode);
2138 if (sbi->s_partitions)
2139 for (i = 0; i < sbi->s_partitions; i++)
2140 udf_free_partition(&sbi->s_partmaps[i]);
2141#ifdef CONFIG_UDF_NLS
2142 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2143 unload_nls(sbi->s_nls_map);
2144#endif
2145 if (!(sb->s_flags & MS_RDONLY))
2146 udf_close_lvid(sb);
2147 brelse(sbi->s_lvid_bh);
2148 kfree(sbi->s_partmaps);
2149 kfree(sb->s_fs_info);
2150 sb->s_fs_info = NULL;
2151}
2152
2153static int udf_sync_fs(struct super_block *sb, int wait)
2154{
2155 struct udf_sb_info *sbi = UDF_SB(sb);
2156
2157 mutex_lock(&sbi->s_alloc_mutex);
2158 if (sbi->s_lvid_dirty) {
2159 /*
2160 * Blockdevice will be synced later so we don't have to submit
2161 * the buffer for IO
2162 */
2163 mark_buffer_dirty(sbi->s_lvid_bh);
2164 sb->s_dirt = 0;
2165 sbi->s_lvid_dirty = 0;
2166 }
2167 mutex_unlock(&sbi->s_alloc_mutex);
2168
2169 return 0;
2170}
2171
2172static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2173{
2174 struct super_block *sb = dentry->d_sb;
2175 struct udf_sb_info *sbi = UDF_SB(sb);
2176 struct logicalVolIntegrityDescImpUse *lvidiu;
2177 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2178
2179 if (sbi->s_lvid_bh != NULL)
2180 lvidiu = udf_sb_lvidiu(sbi);
2181 else
2182 lvidiu = NULL;
2183
2184 buf->f_type = UDF_SUPER_MAGIC;
2185 buf->f_bsize = sb->s_blocksize;
2186 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2187 buf->f_bfree = udf_count_free(sb);
2188 buf->f_bavail = buf->f_bfree;
2189 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2190 le32_to_cpu(lvidiu->numDirs)) : 0)
2191 + buf->f_bfree;
2192 buf->f_ffree = buf->f_bfree;
2193 buf->f_namelen = UDF_NAME_LEN - 2;
2194 buf->f_fsid.val[0] = (u32)id;
2195 buf->f_fsid.val[1] = (u32)(id >> 32);
2196
2197 return 0;
2198}
2199
2200static unsigned int udf_count_free_bitmap(struct super_block *sb,
2201 struct udf_bitmap *bitmap)
2202{
2203 struct buffer_head *bh = NULL;
2204 unsigned int accum = 0;
2205 int index;
2206 int block = 0, newblock;
2207 struct kernel_lb_addr loc;
2208 uint32_t bytes;
2209 uint8_t *ptr;
2210 uint16_t ident;
2211 struct spaceBitmapDesc *bm;
2212
2213 loc.logicalBlockNum = bitmap->s_extPosition;
2214 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2215 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2216
2217 if (!bh) {
2218 udf_err(sb, "udf_count_free failed\n");
2219 goto out;
2220 } else if (ident != TAG_IDENT_SBD) {
2221 brelse(bh);
2222 udf_err(sb, "udf_count_free failed\n");
2223 goto out;
2224 }
2225
2226 bm = (struct spaceBitmapDesc *)bh->b_data;
2227 bytes = le32_to_cpu(bm->numOfBytes);
2228 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2229 ptr = (uint8_t *)bh->b_data;
2230
2231 while (bytes > 0) {
2232 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2233 accum += bitmap_weight((const unsigned long *)(ptr + index),
2234 cur_bytes * 8);
2235 bytes -= cur_bytes;
2236 if (bytes) {
2237 brelse(bh);
2238 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2239 bh = udf_tread(sb, newblock);
2240 if (!bh) {
2241 udf_debug("read failed\n");
2242 goto out;
2243 }
2244 index = 0;
2245 ptr = (uint8_t *)bh->b_data;
2246 }
2247 }
2248 brelse(bh);
2249out:
2250 return accum;
2251}
2252
2253static unsigned int udf_count_free_table(struct super_block *sb,
2254 struct inode *table)
2255{
2256 unsigned int accum = 0;
2257 uint32_t elen;
2258 struct kernel_lb_addr eloc;
2259 int8_t etype;
2260 struct extent_position epos;
2261
2262 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2263 epos.block = UDF_I(table)->i_location;
2264 epos.offset = sizeof(struct unallocSpaceEntry);
2265 epos.bh = NULL;
2266
2267 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2268 accum += (elen >> table->i_sb->s_blocksize_bits);
2269
2270 brelse(epos.bh);
2271 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2272
2273 return accum;
2274}
2275
2276static unsigned int udf_count_free(struct super_block *sb)
2277{
2278 unsigned int accum = 0;
2279 struct udf_sb_info *sbi;
2280 struct udf_part_map *map;
2281
2282 sbi = UDF_SB(sb);
2283 if (sbi->s_lvid_bh) {
2284 struct logicalVolIntegrityDesc *lvid =
2285 (struct logicalVolIntegrityDesc *)
2286 sbi->s_lvid_bh->b_data;
2287 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2288 accum = le32_to_cpu(
2289 lvid->freeSpaceTable[sbi->s_partition]);
2290 if (accum == 0xFFFFFFFF)
2291 accum = 0;
2292 }
2293 }
2294
2295 if (accum)
2296 return accum;
2297
2298 map = &sbi->s_partmaps[sbi->s_partition];
2299 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2300 accum += udf_count_free_bitmap(sb,
2301 map->s_uspace.s_bitmap);
2302 }
2303 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2304 accum += udf_count_free_bitmap(sb,
2305 map->s_fspace.s_bitmap);
2306 }
2307 if (accum)
2308 return accum;
2309
2310 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2311 accum += udf_count_free_table(sb,
2312 map->s_uspace.s_table);
2313 }
2314 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2315 accum += udf_count_free_table(sb,
2316 map->s_fspace.s_table);
2317 }
2318
2319 return accum;
2320}