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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * super.c
4 *
5 * PURPOSE
6 * Super block routines for the OSTA-UDF(tm) filesystem.
7 *
8 * DESCRIPTION
9 * OSTA-UDF(tm) = Optical Storage Technology Association
10 * Universal Disk Format.
11 *
12 * This code is based on version 2.00 of the UDF specification,
13 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
14 * http://www.osta.org/
15 * https://www.ecma.ch/
16 * https://www.iso.org/
17 *
18 * COPYRIGHT
19 * (C) 1998 Dave Boynton
20 * (C) 1998-2004 Ben Fennema
21 * (C) 2000 Stelias Computing Inc
22 *
23 * HISTORY
24 *
25 * 09/24/98 dgb changed to allow compiling outside of kernel, and
26 * added some debugging.
27 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
28 * 10/16/98 attempting some multi-session support
29 * 10/17/98 added freespace count for "df"
30 * 11/11/98 gr added novrs option
31 * 11/26/98 dgb added fileset,anchor mount options
32 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
33 * vol descs. rewrote option handling based on isofs
34 * 12/20/98 find the free space bitmap (if it exists)
35 */
36
37#include "udfdecl.h"
38
39#include <linux/blkdev.h>
40#include <linux/slab.h>
41#include <linux/kernel.h>
42#include <linux/module.h>
43#include <linux/stat.h>
44#include <linux/cdrom.h>
45#include <linux/nls.h>
46#include <linux/vfs.h>
47#include <linux/vmalloc.h>
48#include <linux/errno.h>
49#include <linux/seq_file.h>
50#include <linux/bitmap.h>
51#include <linux/crc-itu-t.h>
52#include <linux/log2.h>
53#include <asm/byteorder.h>
54#include <linux/iversion.h>
55#include <linux/fs_context.h>
56#include <linux/fs_parser.h>
57
58#include "udf_sb.h"
59#include "udf_i.h"
60
61#include <linux/init.h>
62#include <linux/uaccess.h>
63
64enum {
65 VDS_POS_PRIMARY_VOL_DESC,
66 VDS_POS_UNALLOC_SPACE_DESC,
67 VDS_POS_LOGICAL_VOL_DESC,
68 VDS_POS_IMP_USE_VOL_DESC,
69 VDS_POS_LENGTH
70};
71
72#define VSD_FIRST_SECTOR_OFFSET 32768
73#define VSD_MAX_SECTOR_OFFSET 0x800000
74
75/*
76 * Maximum number of Terminating Descriptor / Logical Volume Integrity
77 * Descriptor redirections. The chosen numbers are arbitrary - just that we
78 * hopefully don't limit any real use of rewritten inode on write-once media
79 * but avoid looping for too long on corrupted media.
80 */
81#define UDF_MAX_TD_NESTING 64
82#define UDF_MAX_LVID_NESTING 1000
83
84enum { UDF_MAX_LINKS = 0xffff };
85/*
86 * We limit filesize to 4TB. This is arbitrary as the on-disk format supports
87 * more but because the file space is described by a linked list of extents,
88 * each of which can have at most 1GB, the creation and handling of extents
89 * gets unusably slow beyond certain point...
90 */
91#define UDF_MAX_FILESIZE (1ULL << 42)
92
93/* These are the "meat" - everything else is stuffing */
94static int udf_fill_super(struct super_block *sb, struct fs_context *fc);
95static void udf_put_super(struct super_block *);
96static int udf_sync_fs(struct super_block *, int);
97static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
98static void udf_open_lvid(struct super_block *);
99static void udf_close_lvid(struct super_block *);
100static unsigned int udf_count_free(struct super_block *);
101static int udf_statfs(struct dentry *, struct kstatfs *);
102static int udf_show_options(struct seq_file *, struct dentry *);
103static int udf_init_fs_context(struct fs_context *fc);
104static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param);
105static int udf_reconfigure(struct fs_context *fc);
106static void udf_free_fc(struct fs_context *fc);
107static const struct fs_parameter_spec udf_param_spec[];
108
109struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
110{
111 struct logicalVolIntegrityDesc *lvid;
112 unsigned int partnum;
113 unsigned int offset;
114
115 if (!UDF_SB(sb)->s_lvid_bh)
116 return NULL;
117 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
118 partnum = le32_to_cpu(lvid->numOfPartitions);
119 /* The offset is to skip freeSpaceTable and sizeTable arrays */
120 offset = partnum * 2 * sizeof(uint32_t);
121 return (struct logicalVolIntegrityDescImpUse *)
122 (((uint8_t *)(lvid + 1)) + offset);
123}
124
125/* UDF filesystem type */
126static int udf_get_tree(struct fs_context *fc)
127{
128 return get_tree_bdev(fc, udf_fill_super);
129}
130
131static const struct fs_context_operations udf_context_ops = {
132 .parse_param = udf_parse_param,
133 .get_tree = udf_get_tree,
134 .reconfigure = udf_reconfigure,
135 .free = udf_free_fc,
136};
137
138static struct file_system_type udf_fstype = {
139 .owner = THIS_MODULE,
140 .name = "udf",
141 .kill_sb = kill_block_super,
142 .fs_flags = FS_REQUIRES_DEV,
143 .init_fs_context = udf_init_fs_context,
144 .parameters = udf_param_spec,
145};
146MODULE_ALIAS_FS("udf");
147
148static struct kmem_cache *udf_inode_cachep;
149
150static struct inode *udf_alloc_inode(struct super_block *sb)
151{
152 struct udf_inode_info *ei;
153 ei = alloc_inode_sb(sb, udf_inode_cachep, GFP_KERNEL);
154 if (!ei)
155 return NULL;
156
157 ei->i_unique = 0;
158 ei->i_lenExtents = 0;
159 ei->i_lenStreams = 0;
160 ei->i_next_alloc_block = 0;
161 ei->i_next_alloc_goal = 0;
162 ei->i_strat4096 = 0;
163 ei->i_streamdir = 0;
164 ei->i_hidden = 0;
165 init_rwsem(&ei->i_data_sem);
166 ei->cached_extent.lstart = -1;
167 spin_lock_init(&ei->i_extent_cache_lock);
168 inode_set_iversion(&ei->vfs_inode, 1);
169
170 return &ei->vfs_inode;
171}
172
173static void udf_free_in_core_inode(struct inode *inode)
174{
175 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
176}
177
178static void init_once(void *foo)
179{
180 struct udf_inode_info *ei = foo;
181
182 ei->i_data = NULL;
183 inode_init_once(&ei->vfs_inode);
184}
185
186static int __init init_inodecache(void)
187{
188 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
189 sizeof(struct udf_inode_info),
190 0, (SLAB_RECLAIM_ACCOUNT |
191 SLAB_ACCOUNT),
192 init_once);
193 if (!udf_inode_cachep)
194 return -ENOMEM;
195 return 0;
196}
197
198static void destroy_inodecache(void)
199{
200 /*
201 * Make sure all delayed rcu free inodes are flushed before we
202 * destroy cache.
203 */
204 rcu_barrier();
205 kmem_cache_destroy(udf_inode_cachep);
206}
207
208/* Superblock operations */
209static const struct super_operations udf_sb_ops = {
210 .alloc_inode = udf_alloc_inode,
211 .free_inode = udf_free_in_core_inode,
212 .write_inode = udf_write_inode,
213 .evict_inode = udf_evict_inode,
214 .put_super = udf_put_super,
215 .sync_fs = udf_sync_fs,
216 .statfs = udf_statfs,
217 .show_options = udf_show_options,
218};
219
220struct udf_options {
221 unsigned int blocksize;
222 unsigned int session;
223 unsigned int lastblock;
224 unsigned int anchor;
225 unsigned int flags;
226 umode_t umask;
227 kgid_t gid;
228 kuid_t uid;
229 umode_t fmode;
230 umode_t dmode;
231 struct nls_table *nls_map;
232};
233
234/*
235 * UDF has historically preserved prior mount options across
236 * a remount, so copy those here if remounting, otherwise set
237 * initial mount defaults.
238 */
239static void udf_init_options(struct fs_context *fc, struct udf_options *uopt)
240{
241 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
242 struct super_block *sb = fc->root->d_sb;
243 struct udf_sb_info *sbi = UDF_SB(sb);
244
245 uopt->flags = sbi->s_flags;
246 uopt->uid = sbi->s_uid;
247 uopt->gid = sbi->s_gid;
248 uopt->umask = sbi->s_umask;
249 uopt->fmode = sbi->s_fmode;
250 uopt->dmode = sbi->s_dmode;
251 uopt->nls_map = NULL;
252 } else {
253 uopt->flags = (1 << UDF_FLAG_USE_AD_IN_ICB) |
254 (1 << UDF_FLAG_STRICT);
255 /*
256 * By default we'll use overflow[ug]id when UDF
257 * inode [ug]id == -1
258 */
259 uopt->uid = make_kuid(current_user_ns(), overflowuid);
260 uopt->gid = make_kgid(current_user_ns(), overflowgid);
261 uopt->umask = 0;
262 uopt->fmode = UDF_INVALID_MODE;
263 uopt->dmode = UDF_INVALID_MODE;
264 uopt->nls_map = NULL;
265 uopt->session = 0xFFFFFFFF;
266 }
267}
268
269static int udf_init_fs_context(struct fs_context *fc)
270{
271 struct udf_options *uopt;
272
273 uopt = kzalloc(sizeof(*uopt), GFP_KERNEL);
274 if (!uopt)
275 return -ENOMEM;
276
277 udf_init_options(fc, uopt);
278
279 fc->fs_private = uopt;
280 fc->ops = &udf_context_ops;
281
282 return 0;
283}
284
285static void udf_free_fc(struct fs_context *fc)
286{
287 struct udf_options *uopt = fc->fs_private;
288
289 unload_nls(uopt->nls_map);
290 kfree(fc->fs_private);
291}
292
293static int __init init_udf_fs(void)
294{
295 int err;
296
297 err = init_inodecache();
298 if (err)
299 goto out1;
300 err = register_filesystem(&udf_fstype);
301 if (err)
302 goto out;
303
304 return 0;
305
306out:
307 destroy_inodecache();
308
309out1:
310 return err;
311}
312
313static void __exit exit_udf_fs(void)
314{
315 unregister_filesystem(&udf_fstype);
316 destroy_inodecache();
317}
318
319static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
320{
321 struct udf_sb_info *sbi = UDF_SB(sb);
322
323 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
324 if (!sbi->s_partmaps) {
325 sbi->s_partitions = 0;
326 return -ENOMEM;
327 }
328
329 sbi->s_partitions = count;
330 return 0;
331}
332
333static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
334{
335 int i;
336 int nr_groups = bitmap->s_nr_groups;
337
338 for (i = 0; i < nr_groups; i++)
339 if (!IS_ERR_OR_NULL(bitmap->s_block_bitmap[i]))
340 brelse(bitmap->s_block_bitmap[i]);
341
342 kvfree(bitmap);
343}
344
345static void udf_free_partition(struct udf_part_map *map)
346{
347 int i;
348 struct udf_meta_data *mdata;
349
350 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
351 iput(map->s_uspace.s_table);
352 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
353 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
354 if (map->s_partition_type == UDF_SPARABLE_MAP15)
355 for (i = 0; i < 4; i++)
356 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
357 else if (map->s_partition_type == UDF_METADATA_MAP25) {
358 mdata = &map->s_type_specific.s_metadata;
359 iput(mdata->s_metadata_fe);
360 mdata->s_metadata_fe = NULL;
361
362 iput(mdata->s_mirror_fe);
363 mdata->s_mirror_fe = NULL;
364
365 iput(mdata->s_bitmap_fe);
366 mdata->s_bitmap_fe = NULL;
367 }
368}
369
370static void udf_sb_free_partitions(struct super_block *sb)
371{
372 struct udf_sb_info *sbi = UDF_SB(sb);
373 int i;
374
375 if (!sbi->s_partmaps)
376 return;
377 for (i = 0; i < sbi->s_partitions; i++)
378 udf_free_partition(&sbi->s_partmaps[i]);
379 kfree(sbi->s_partmaps);
380 sbi->s_partmaps = NULL;
381}
382
383static int udf_show_options(struct seq_file *seq, struct dentry *root)
384{
385 struct super_block *sb = root->d_sb;
386 struct udf_sb_info *sbi = UDF_SB(sb);
387
388 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
389 seq_puts(seq, ",nostrict");
390 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
391 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
392 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
393 seq_puts(seq, ",unhide");
394 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
395 seq_puts(seq, ",undelete");
396 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
397 seq_puts(seq, ",noadinicb");
398 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
399 seq_puts(seq, ",shortad");
400 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
401 seq_puts(seq, ",uid=forget");
402 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
403 seq_puts(seq, ",gid=forget");
404 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
405 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
406 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
407 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
408 if (sbi->s_umask != 0)
409 seq_printf(seq, ",umask=%ho", sbi->s_umask);
410 if (sbi->s_fmode != UDF_INVALID_MODE)
411 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
412 if (sbi->s_dmode != UDF_INVALID_MODE)
413 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
414 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
415 seq_printf(seq, ",session=%d", sbi->s_session);
416 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
417 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
418 if (sbi->s_anchor != 0)
419 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
420 if (sbi->s_nls_map)
421 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
422 else
423 seq_puts(seq, ",iocharset=utf8");
424
425 return 0;
426}
427
428/*
429 * udf_parse_param
430 *
431 * PURPOSE
432 * Parse mount options.
433 *
434 * DESCRIPTION
435 * The following mount options are supported:
436 *
437 * gid= Set the default group.
438 * umask= Set the default umask.
439 * mode= Set the default file permissions.
440 * dmode= Set the default directory permissions.
441 * uid= Set the default user.
442 * bs= Set the block size.
443 * unhide Show otherwise hidden files.
444 * undelete Show deleted files in lists.
445 * adinicb Embed data in the inode (default)
446 * noadinicb Don't embed data in the inode
447 * shortad Use short ad's
448 * longad Use long ad's (default)
449 * nostrict Unset strict conformance
450 * iocharset= Set the NLS character set
451 *
452 * The remaining are for debugging and disaster recovery:
453 *
454 * novrs Skip volume sequence recognition
455 *
456 * The following expect a offset from 0.
457 *
458 * session= Set the CDROM session (default= last session)
459 * anchor= Override standard anchor location. (default= 256)
460 * volume= Override the VolumeDesc location. (unused)
461 * partition= Override the PartitionDesc location. (unused)
462 * lastblock= Set the last block of the filesystem/
463 *
464 * The following expect a offset from the partition root.
465 *
466 * fileset= Override the fileset block location. (unused)
467 * rootdir= Override the root directory location. (unused)
468 * WARNING: overriding the rootdir to a non-directory may
469 * yield highly unpredictable results.
470 *
471 * PRE-CONDITIONS
472 * fc fs_context with pointer to mount options variable.
473 * param Pointer to fs_parameter being parsed.
474 *
475 * POST-CONDITIONS
476 * <return> 0 Mount options parsed okay.
477 * <return> errno Error parsing mount options.
478 *
479 * HISTORY
480 * July 1, 1997 - Andrew E. Mileski
481 * Written, tested, and released.
482 */
483
484enum {
485 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
486 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
487 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
488 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
489 Opt_rootdir, Opt_utf8, Opt_iocharset, Opt_err, Opt_fmode, Opt_dmode
490};
491
492static const struct fs_parameter_spec udf_param_spec[] = {
493 fsparam_flag ("novrs", Opt_novrs),
494 fsparam_flag ("nostrict", Opt_nostrict),
495 fsparam_u32 ("bs", Opt_bs),
496 fsparam_flag ("unhide", Opt_unhide),
497 fsparam_flag ("undelete", Opt_undelete),
498 fsparam_flag_no ("adinicb", Opt_adinicb),
499 fsparam_flag ("shortad", Opt_shortad),
500 fsparam_flag ("longad", Opt_longad),
501 fsparam_string ("gid", Opt_gid),
502 fsparam_string ("uid", Opt_uid),
503 fsparam_u32 ("umask", Opt_umask),
504 fsparam_u32 ("session", Opt_session),
505 fsparam_u32 ("lastblock", Opt_lastblock),
506 fsparam_u32 ("anchor", Opt_anchor),
507 fsparam_u32 ("volume", Opt_volume),
508 fsparam_u32 ("partition", Opt_partition),
509 fsparam_u32 ("fileset", Opt_fileset),
510 fsparam_u32 ("rootdir", Opt_rootdir),
511 fsparam_flag ("utf8", Opt_utf8),
512 fsparam_string ("iocharset", Opt_iocharset),
513 fsparam_u32 ("mode", Opt_fmode),
514 fsparam_u32 ("dmode", Opt_dmode),
515 {}
516 };
517
518static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param)
519{
520 unsigned int uv;
521 unsigned int n;
522 struct udf_options *uopt = fc->fs_private;
523 struct fs_parse_result result;
524 int token;
525 bool remount = (fc->purpose & FS_CONTEXT_FOR_RECONFIGURE);
526
527 token = fs_parse(fc, udf_param_spec, param, &result);
528 if (token < 0)
529 return token;
530
531 switch (token) {
532 case Opt_novrs:
533 uopt->flags |= (1 << UDF_FLAG_NOVRS);
534 break;
535 case Opt_bs:
536 n = result.uint_32;
537 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
538 return -EINVAL;
539 uopt->blocksize = n;
540 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
541 break;
542 case Opt_unhide:
543 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
544 break;
545 case Opt_undelete:
546 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
547 break;
548 case Opt_adinicb:
549 if (result.negated)
550 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
551 else
552 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
553 break;
554 case Opt_shortad:
555 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
556 break;
557 case Opt_longad:
558 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
559 break;
560 case Opt_gid:
561 if (kstrtoint(param->string, 10, &uv) == 0) {
562 kgid_t gid = make_kgid(current_user_ns(), uv);
563 if (!gid_valid(gid))
564 return -EINVAL;
565 uopt->gid = gid;
566 uopt->flags |= (1 << UDF_FLAG_GID_SET);
567 } else if (!strcmp(param->string, "forget")) {
568 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
569 } else if (!strcmp(param->string, "ignore")) {
570 /* this option is superseded by gid=<number> */
571 ;
572 } else {
573 return -EINVAL;
574 }
575 break;
576 case Opt_uid:
577 if (kstrtoint(param->string, 10, &uv) == 0) {
578 kuid_t uid = make_kuid(current_user_ns(), uv);
579 if (!uid_valid(uid))
580 return -EINVAL;
581 uopt->uid = uid;
582 uopt->flags |= (1 << UDF_FLAG_UID_SET);
583 } else if (!strcmp(param->string, "forget")) {
584 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
585 } else if (!strcmp(param->string, "ignore")) {
586 /* this option is superseded by uid=<number> */
587 ;
588 } else {
589 return -EINVAL;
590 }
591 break;
592 case Opt_umask:
593 uopt->umask = result.uint_32;
594 break;
595 case Opt_nostrict:
596 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
597 break;
598 case Opt_session:
599 uopt->session = result.uint_32;
600 if (!remount)
601 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
602 break;
603 case Opt_lastblock:
604 uopt->lastblock = result.uint_32;
605 if (!remount)
606 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
607 break;
608 case Opt_anchor:
609 uopt->anchor = result.uint_32;
610 break;
611 case Opt_volume:
612 case Opt_partition:
613 case Opt_fileset:
614 case Opt_rootdir:
615 /* Ignored (never implemented properly) */
616 break;
617 case Opt_utf8:
618 if (!remount) {
619 unload_nls(uopt->nls_map);
620 uopt->nls_map = NULL;
621 }
622 break;
623 case Opt_iocharset:
624 if (!remount) {
625 unload_nls(uopt->nls_map);
626 uopt->nls_map = NULL;
627 }
628 /* When nls_map is not loaded then UTF-8 is used */
629 if (!remount && strcmp(param->string, "utf8") != 0) {
630 uopt->nls_map = load_nls(param->string);
631 if (!uopt->nls_map) {
632 errorf(fc, "iocharset %s not found",
633 param->string);
634 return -EINVAL;
635 }
636 }
637 break;
638 case Opt_fmode:
639 uopt->fmode = result.uint_32 & 0777;
640 break;
641 case Opt_dmode:
642 uopt->dmode = result.uint_32 & 0777;
643 break;
644 default:
645 return -EINVAL;
646 }
647 return 0;
648}
649
650static int udf_reconfigure(struct fs_context *fc)
651{
652 struct udf_options *uopt = fc->fs_private;
653 struct super_block *sb = fc->root->d_sb;
654 struct udf_sb_info *sbi = UDF_SB(sb);
655 int readonly = fc->sb_flags & SB_RDONLY;
656 int error = 0;
657
658 if (!readonly && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
659 return -EACCES;
660
661 sync_filesystem(sb);
662
663 write_lock(&sbi->s_cred_lock);
664 sbi->s_flags = uopt->flags;
665 sbi->s_uid = uopt->uid;
666 sbi->s_gid = uopt->gid;
667 sbi->s_umask = uopt->umask;
668 sbi->s_fmode = uopt->fmode;
669 sbi->s_dmode = uopt->dmode;
670 write_unlock(&sbi->s_cred_lock);
671
672 if (readonly == sb_rdonly(sb))
673 goto out_unlock;
674
675 if (readonly)
676 udf_close_lvid(sb);
677 else
678 udf_open_lvid(sb);
679
680out_unlock:
681 return error;
682}
683
684/*
685 * Check VSD descriptor. Returns -1 in case we are at the end of volume
686 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if
687 * we found one of NSR descriptors we are looking for.
688 */
689static int identify_vsd(const struct volStructDesc *vsd)
690{
691 int ret = 0;
692
693 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
694 switch (vsd->structType) {
695 case 0:
696 udf_debug("ISO9660 Boot Record found\n");
697 break;
698 case 1:
699 udf_debug("ISO9660 Primary Volume Descriptor found\n");
700 break;
701 case 2:
702 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
703 break;
704 case 3:
705 udf_debug("ISO9660 Volume Partition Descriptor found\n");
706 break;
707 case 255:
708 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
709 break;
710 default:
711 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
712 break;
713 }
714 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
715 ; /* ret = 0 */
716 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
717 ret = 1;
718 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
719 ret = 1;
720 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
721 ; /* ret = 0 */
722 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
723 ; /* ret = 0 */
724 else {
725 /* TEA01 or invalid id : end of volume recognition area */
726 ret = -1;
727 }
728
729 return ret;
730}
731
732/*
733 * Check Volume Structure Descriptors (ECMA 167 2/9.1)
734 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
735 * @return 1 if NSR02 or NSR03 found,
736 * -1 if first sector read error, 0 otherwise
737 */
738static int udf_check_vsd(struct super_block *sb)
739{
740 struct volStructDesc *vsd = NULL;
741 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
742 int sectorsize;
743 struct buffer_head *bh = NULL;
744 int nsr = 0;
745 struct udf_sb_info *sbi;
746 loff_t session_offset;
747
748 sbi = UDF_SB(sb);
749 if (sb->s_blocksize < sizeof(struct volStructDesc))
750 sectorsize = sizeof(struct volStructDesc);
751 else
752 sectorsize = sb->s_blocksize;
753
754 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
755 sector += session_offset;
756
757 udf_debug("Starting at sector %u (%lu byte sectors)\n",
758 (unsigned int)(sector >> sb->s_blocksize_bits),
759 sb->s_blocksize);
760 /* Process the sequence (if applicable). The hard limit on the sector
761 * offset is arbitrary, hopefully large enough so that all valid UDF
762 * filesystems will be recognised. There is no mention of an upper
763 * bound to the size of the volume recognition area in the standard.
764 * The limit will prevent the code to read all the sectors of a
765 * specially crafted image (like a bluray disc full of CD001 sectors),
766 * potentially causing minutes or even hours of uninterruptible I/O
767 * activity. This actually happened with uninitialised SSD partitions
768 * (all 0xFF) before the check for the limit and all valid IDs were
769 * added */
770 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
771 /* Read a block */
772 bh = sb_bread(sb, sector >> sb->s_blocksize_bits);
773 if (!bh)
774 break;
775
776 vsd = (struct volStructDesc *)(bh->b_data +
777 (sector & (sb->s_blocksize - 1)));
778 nsr = identify_vsd(vsd);
779 /* Found NSR or end? */
780 if (nsr) {
781 brelse(bh);
782 break;
783 }
784 /*
785 * Special handling for improperly formatted VRS (e.g., Win10)
786 * where components are separated by 2048 bytes even though
787 * sectors are 4K
788 */
789 if (sb->s_blocksize == 4096) {
790 nsr = identify_vsd(vsd + 1);
791 /* Ignore unknown IDs... */
792 if (nsr < 0)
793 nsr = 0;
794 }
795 brelse(bh);
796 }
797
798 if (nsr > 0)
799 return 1;
800 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
801 return -1;
802 else
803 return 0;
804}
805
806static int udf_verify_domain_identifier(struct super_block *sb,
807 struct regid *ident, char *dname)
808{
809 struct domainIdentSuffix *suffix;
810
811 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
812 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
813 goto force_ro;
814 }
815 if (ident->flags & ENTITYID_FLAGS_DIRTY) {
816 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
817 dname);
818 goto force_ro;
819 }
820 suffix = (struct domainIdentSuffix *)ident->identSuffix;
821 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
822 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
823 if (!sb_rdonly(sb)) {
824 udf_warn(sb, "Descriptor for %s marked write protected."
825 " Forcing read only mount.\n", dname);
826 }
827 goto force_ro;
828 }
829 return 0;
830
831force_ro:
832 if (!sb_rdonly(sb))
833 return -EACCES;
834 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
835 return 0;
836}
837
838static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
839 struct kernel_lb_addr *root)
840{
841 int ret;
842
843 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
844 if (ret < 0)
845 return ret;
846
847 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
848 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
849
850 udf_debug("Rootdir at block=%u, partition=%u\n",
851 root->logicalBlockNum, root->partitionReferenceNum);
852 return 0;
853}
854
855static int udf_find_fileset(struct super_block *sb,
856 struct kernel_lb_addr *fileset,
857 struct kernel_lb_addr *root)
858{
859 struct buffer_head *bh;
860 uint16_t ident;
861 int ret;
862
863 if (fileset->logicalBlockNum == 0xFFFFFFFF &&
864 fileset->partitionReferenceNum == 0xFFFF)
865 return -EINVAL;
866
867 bh = udf_read_ptagged(sb, fileset, 0, &ident);
868 if (!bh)
869 return -EIO;
870 if (ident != TAG_IDENT_FSD) {
871 brelse(bh);
872 return -EINVAL;
873 }
874
875 udf_debug("Fileset at block=%u, partition=%u\n",
876 fileset->logicalBlockNum, fileset->partitionReferenceNum);
877
878 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
879 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
880 brelse(bh);
881 return ret;
882}
883
884/*
885 * Load primary Volume Descriptor Sequence
886 *
887 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
888 * should be tried.
889 */
890static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
891{
892 struct primaryVolDesc *pvoldesc;
893 uint8_t *outstr;
894 struct buffer_head *bh;
895 uint16_t ident;
896 int ret;
897 struct timestamp *ts;
898
899 outstr = kzalloc(128, GFP_KERNEL);
900 if (!outstr)
901 return -ENOMEM;
902
903 bh = udf_read_tagged(sb, block, block, &ident);
904 if (!bh) {
905 ret = -EAGAIN;
906 goto out2;
907 }
908
909 if (ident != TAG_IDENT_PVD) {
910 ret = -EIO;
911 goto out_bh;
912 }
913
914 pvoldesc = (struct primaryVolDesc *)bh->b_data;
915
916 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
917 pvoldesc->recordingDateAndTime);
918 ts = &pvoldesc->recordingDateAndTime;
919 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
920 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
921 ts->minute, le16_to_cpu(ts->typeAndTimezone));
922
923 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
924 if (ret < 0) {
925 strscpy_pad(UDF_SB(sb)->s_volume_ident, "InvalidName");
926 pr_warn("incorrect volume identification, setting to "
927 "'InvalidName'\n");
928 } else {
929 strscpy_pad(UDF_SB(sb)->s_volume_ident, outstr);
930 }
931 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
932
933 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
934 if (ret < 0) {
935 ret = 0;
936 goto out_bh;
937 }
938 outstr[ret] = 0;
939 udf_debug("volSetIdent[] = '%s'\n", outstr);
940
941 ret = 0;
942out_bh:
943 brelse(bh);
944out2:
945 kfree(outstr);
946 return ret;
947}
948
949struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
950 u32 meta_file_loc, u32 partition_ref)
951{
952 struct kernel_lb_addr addr;
953 struct inode *metadata_fe;
954
955 addr.logicalBlockNum = meta_file_loc;
956 addr.partitionReferenceNum = partition_ref;
957
958 metadata_fe = udf_iget_special(sb, &addr);
959
960 if (IS_ERR(metadata_fe)) {
961 udf_warn(sb, "metadata inode efe not found\n");
962 return metadata_fe;
963 }
964 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
965 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
966 iput(metadata_fe);
967 return ERR_PTR(-EIO);
968 }
969
970 return metadata_fe;
971}
972
973static int udf_load_metadata_files(struct super_block *sb, int partition,
974 int type1_index)
975{
976 struct udf_sb_info *sbi = UDF_SB(sb);
977 struct udf_part_map *map;
978 struct udf_meta_data *mdata;
979 struct kernel_lb_addr addr;
980 struct inode *fe;
981
982 map = &sbi->s_partmaps[partition];
983 mdata = &map->s_type_specific.s_metadata;
984 mdata->s_phys_partition_ref = type1_index;
985
986 /* metadata address */
987 udf_debug("Metadata file location: block = %u part = %u\n",
988 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
989
990 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
991 mdata->s_phys_partition_ref);
992 if (IS_ERR(fe)) {
993 /* mirror file entry */
994 udf_debug("Mirror metadata file location: block = %u part = %u\n",
995 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
996
997 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
998 mdata->s_phys_partition_ref);
999
1000 if (IS_ERR(fe)) {
1001 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
1002 return PTR_ERR(fe);
1003 }
1004 mdata->s_mirror_fe = fe;
1005 } else
1006 mdata->s_metadata_fe = fe;
1007
1008
1009 /*
1010 * bitmap file entry
1011 * Note:
1012 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1013 */
1014 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1015 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1016 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
1017
1018 udf_debug("Bitmap file location: block = %u part = %u\n",
1019 addr.logicalBlockNum, addr.partitionReferenceNum);
1020
1021 fe = udf_iget_special(sb, &addr);
1022 if (IS_ERR(fe)) {
1023 if (sb_rdonly(sb))
1024 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1025 else {
1026 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1027 return PTR_ERR(fe);
1028 }
1029 } else
1030 mdata->s_bitmap_fe = fe;
1031 }
1032
1033 udf_debug("udf_load_metadata_files Ok\n");
1034 return 0;
1035}
1036
1037int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1038{
1039 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1040 return DIV_ROUND_UP(map->s_partition_len +
1041 (sizeof(struct spaceBitmapDesc) << 3),
1042 sb->s_blocksize * 8);
1043}
1044
1045static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1046{
1047 struct udf_bitmap *bitmap;
1048 int nr_groups = udf_compute_nr_groups(sb, index);
1049
1050 bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
1051 GFP_KERNEL);
1052 if (!bitmap)
1053 return NULL;
1054
1055 bitmap->s_nr_groups = nr_groups;
1056 return bitmap;
1057}
1058
1059static int check_partition_desc(struct super_block *sb,
1060 struct partitionDesc *p,
1061 struct udf_part_map *map)
1062{
1063 bool umap, utable, fmap, ftable;
1064 struct partitionHeaderDesc *phd;
1065
1066 switch (le32_to_cpu(p->accessType)) {
1067 case PD_ACCESS_TYPE_READ_ONLY:
1068 case PD_ACCESS_TYPE_WRITE_ONCE:
1069 case PD_ACCESS_TYPE_NONE:
1070 goto force_ro;
1071 }
1072
1073 /* No Partition Header Descriptor? */
1074 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1075 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1076 goto force_ro;
1077
1078 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1079 utable = phd->unallocSpaceTable.extLength;
1080 umap = phd->unallocSpaceBitmap.extLength;
1081 ftable = phd->freedSpaceTable.extLength;
1082 fmap = phd->freedSpaceBitmap.extLength;
1083
1084 /* No allocation info? */
1085 if (!utable && !umap && !ftable && !fmap)
1086 goto force_ro;
1087
1088 /* We don't support blocks that require erasing before overwrite */
1089 if (ftable || fmap)
1090 goto force_ro;
1091 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1092 if (utable && umap)
1093 goto force_ro;
1094
1095 if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1096 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1097 map->s_partition_type == UDF_METADATA_MAP25)
1098 goto force_ro;
1099
1100 return 0;
1101force_ro:
1102 if (!sb_rdonly(sb))
1103 return -EACCES;
1104 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1105 return 0;
1106}
1107
1108static int udf_fill_partdesc_info(struct super_block *sb,
1109 struct partitionDesc *p, int p_index)
1110{
1111 struct udf_part_map *map;
1112 struct udf_sb_info *sbi = UDF_SB(sb);
1113 struct partitionHeaderDesc *phd;
1114 u32 sum;
1115 int err;
1116
1117 map = &sbi->s_partmaps[p_index];
1118
1119 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1120 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1121 if (check_add_overflow(map->s_partition_root, map->s_partition_len,
1122 &sum)) {
1123 udf_err(sb, "Partition %d has invalid location %u + %u\n",
1124 p_index, map->s_partition_root, map->s_partition_len);
1125 return -EFSCORRUPTED;
1126 }
1127
1128 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1129 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1130 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1131 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1132 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1133 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1134 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1135 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1136
1137 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1138 p_index, map->s_partition_type,
1139 map->s_partition_root, map->s_partition_len);
1140
1141 err = check_partition_desc(sb, p, map);
1142 if (err)
1143 return err;
1144
1145 /*
1146 * Skip loading allocation info it we cannot ever write to the fs.
1147 * This is a correctness thing as we may have decided to force ro mount
1148 * to avoid allocation info we don't support.
1149 */
1150 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1151 return 0;
1152
1153 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1154 if (phd->unallocSpaceTable.extLength) {
1155 struct kernel_lb_addr loc = {
1156 .logicalBlockNum = le32_to_cpu(
1157 phd->unallocSpaceTable.extPosition),
1158 .partitionReferenceNum = p_index,
1159 };
1160 struct inode *inode;
1161
1162 inode = udf_iget_special(sb, &loc);
1163 if (IS_ERR(inode)) {
1164 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1165 p_index);
1166 return PTR_ERR(inode);
1167 }
1168 map->s_uspace.s_table = inode;
1169 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1170 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1171 p_index, map->s_uspace.s_table->i_ino);
1172 }
1173
1174 if (phd->unallocSpaceBitmap.extLength) {
1175 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1176 if (!bitmap)
1177 return -ENOMEM;
1178 map->s_uspace.s_bitmap = bitmap;
1179 bitmap->s_extPosition = le32_to_cpu(
1180 phd->unallocSpaceBitmap.extPosition);
1181 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1182 /* Check whether math over bitmap won't overflow. */
1183 if (check_add_overflow(map->s_partition_len,
1184 sizeof(struct spaceBitmapDesc) << 3,
1185 &sum)) {
1186 udf_err(sb, "Partition %d is too long (%u)\n", p_index,
1187 map->s_partition_len);
1188 return -EFSCORRUPTED;
1189 }
1190 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1191 p_index, bitmap->s_extPosition);
1192 }
1193
1194 return 0;
1195}
1196
1197static void udf_find_vat_block(struct super_block *sb, int p_index,
1198 int type1_index, sector_t start_block)
1199{
1200 struct udf_sb_info *sbi = UDF_SB(sb);
1201 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1202 sector_t vat_block;
1203 struct kernel_lb_addr ino;
1204 struct inode *inode;
1205
1206 /*
1207 * VAT file entry is in the last recorded block. Some broken disks have
1208 * it a few blocks before so try a bit harder...
1209 */
1210 ino.partitionReferenceNum = type1_index;
1211 for (vat_block = start_block;
1212 vat_block >= map->s_partition_root &&
1213 vat_block >= start_block - 3; vat_block--) {
1214 ino.logicalBlockNum = vat_block - map->s_partition_root;
1215 inode = udf_iget_special(sb, &ino);
1216 if (!IS_ERR(inode)) {
1217 sbi->s_vat_inode = inode;
1218 break;
1219 }
1220 }
1221}
1222
1223static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1224{
1225 struct udf_sb_info *sbi = UDF_SB(sb);
1226 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1227 struct buffer_head *bh = NULL;
1228 struct udf_inode_info *vati;
1229 struct virtualAllocationTable20 *vat20;
1230 sector_t blocks = sb_bdev_nr_blocks(sb);
1231
1232 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1233 if (!sbi->s_vat_inode &&
1234 sbi->s_last_block != blocks - 1) {
1235 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1236 (unsigned long)sbi->s_last_block,
1237 (unsigned long)blocks - 1);
1238 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1239 }
1240 if (!sbi->s_vat_inode)
1241 return -EIO;
1242
1243 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1244 map->s_type_specific.s_virtual.s_start_offset = 0;
1245 map->s_type_specific.s_virtual.s_num_entries =
1246 (sbi->s_vat_inode->i_size - 36) >> 2;
1247 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1248 vati = UDF_I(sbi->s_vat_inode);
1249 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1250 int err = 0;
1251
1252 bh = udf_bread(sbi->s_vat_inode, 0, 0, &err);
1253 if (!bh) {
1254 if (!err)
1255 err = -EFSCORRUPTED;
1256 return err;
1257 }
1258 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1259 } else {
1260 vat20 = (struct virtualAllocationTable20 *)
1261 vati->i_data;
1262 }
1263
1264 map->s_type_specific.s_virtual.s_start_offset =
1265 le16_to_cpu(vat20->lengthHeader);
1266 map->s_type_specific.s_virtual.s_num_entries =
1267 (sbi->s_vat_inode->i_size -
1268 map->s_type_specific.s_virtual.
1269 s_start_offset) >> 2;
1270 brelse(bh);
1271 }
1272 return 0;
1273}
1274
1275/*
1276 * Load partition descriptor block
1277 *
1278 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1279 * sequence.
1280 */
1281static int udf_load_partdesc(struct super_block *sb, sector_t block)
1282{
1283 struct buffer_head *bh;
1284 struct partitionDesc *p;
1285 struct udf_part_map *map;
1286 struct udf_sb_info *sbi = UDF_SB(sb);
1287 int i, type1_idx;
1288 uint16_t partitionNumber;
1289 uint16_t ident;
1290 int ret;
1291
1292 bh = udf_read_tagged(sb, block, block, &ident);
1293 if (!bh)
1294 return -EAGAIN;
1295 if (ident != TAG_IDENT_PD) {
1296 ret = 0;
1297 goto out_bh;
1298 }
1299
1300 p = (struct partitionDesc *)bh->b_data;
1301 partitionNumber = le16_to_cpu(p->partitionNumber);
1302
1303 /* First scan for TYPE1 and SPARABLE partitions */
1304 for (i = 0; i < sbi->s_partitions; i++) {
1305 map = &sbi->s_partmaps[i];
1306 udf_debug("Searching map: (%u == %u)\n",
1307 map->s_partition_num, partitionNumber);
1308 if (map->s_partition_num == partitionNumber &&
1309 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1310 map->s_partition_type == UDF_SPARABLE_MAP15))
1311 break;
1312 }
1313
1314 if (i >= sbi->s_partitions) {
1315 udf_debug("Partition (%u) not found in partition map\n",
1316 partitionNumber);
1317 ret = 0;
1318 goto out_bh;
1319 }
1320
1321 ret = udf_fill_partdesc_info(sb, p, i);
1322 if (ret < 0)
1323 goto out_bh;
1324
1325 /*
1326 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1327 * PHYSICAL partitions are already set up
1328 */
1329 type1_idx = i;
1330 map = NULL; /* supress 'maybe used uninitialized' warning */
1331 for (i = 0; i < sbi->s_partitions; i++) {
1332 map = &sbi->s_partmaps[i];
1333
1334 if (map->s_partition_num == partitionNumber &&
1335 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1336 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1337 map->s_partition_type == UDF_METADATA_MAP25))
1338 break;
1339 }
1340
1341 if (i >= sbi->s_partitions) {
1342 ret = 0;
1343 goto out_bh;
1344 }
1345
1346 ret = udf_fill_partdesc_info(sb, p, i);
1347 if (ret < 0)
1348 goto out_bh;
1349
1350 if (map->s_partition_type == UDF_METADATA_MAP25) {
1351 ret = udf_load_metadata_files(sb, i, type1_idx);
1352 if (ret < 0) {
1353 udf_err(sb, "error loading MetaData partition map %d\n",
1354 i);
1355 goto out_bh;
1356 }
1357 } else {
1358 /*
1359 * If we have a partition with virtual map, we don't handle
1360 * writing to it (we overwrite blocks instead of relocating
1361 * them).
1362 */
1363 if (!sb_rdonly(sb)) {
1364 ret = -EACCES;
1365 goto out_bh;
1366 }
1367 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1368 ret = udf_load_vat(sb, i, type1_idx);
1369 if (ret < 0)
1370 goto out_bh;
1371 }
1372 ret = 0;
1373out_bh:
1374 /* In case loading failed, we handle cleanup in udf_fill_super */
1375 brelse(bh);
1376 return ret;
1377}
1378
1379static int udf_load_sparable_map(struct super_block *sb,
1380 struct udf_part_map *map,
1381 struct sparablePartitionMap *spm)
1382{
1383 uint32_t loc;
1384 uint16_t ident;
1385 struct sparingTable *st;
1386 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1387 int i;
1388 struct buffer_head *bh;
1389
1390 map->s_partition_type = UDF_SPARABLE_MAP15;
1391 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1392 if (!is_power_of_2(sdata->s_packet_len)) {
1393 udf_err(sb, "error loading logical volume descriptor: "
1394 "Invalid packet length %u\n",
1395 (unsigned)sdata->s_packet_len);
1396 return -EIO;
1397 }
1398 if (spm->numSparingTables > 4) {
1399 udf_err(sb, "error loading logical volume descriptor: "
1400 "Too many sparing tables (%d)\n",
1401 (int)spm->numSparingTables);
1402 return -EIO;
1403 }
1404 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1405 udf_err(sb, "error loading logical volume descriptor: "
1406 "Too big sparing table size (%u)\n",
1407 le32_to_cpu(spm->sizeSparingTable));
1408 return -EIO;
1409 }
1410
1411 for (i = 0; i < spm->numSparingTables; i++) {
1412 loc = le32_to_cpu(spm->locSparingTable[i]);
1413 bh = udf_read_tagged(sb, loc, loc, &ident);
1414 if (!bh)
1415 continue;
1416
1417 st = (struct sparingTable *)bh->b_data;
1418 if (ident != 0 ||
1419 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1420 strlen(UDF_ID_SPARING)) ||
1421 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1422 sb->s_blocksize) {
1423 brelse(bh);
1424 continue;
1425 }
1426
1427 sdata->s_spar_map[i] = bh;
1428 }
1429 map->s_partition_func = udf_get_pblock_spar15;
1430 return 0;
1431}
1432
1433static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1434 struct kernel_lb_addr *fileset)
1435{
1436 struct logicalVolDesc *lvd;
1437 int i, offset;
1438 uint8_t type;
1439 struct udf_sb_info *sbi = UDF_SB(sb);
1440 struct genericPartitionMap *gpm;
1441 uint16_t ident;
1442 struct buffer_head *bh;
1443 unsigned int table_len;
1444 int ret;
1445
1446 bh = udf_read_tagged(sb, block, block, &ident);
1447 if (!bh)
1448 return -EAGAIN;
1449 BUG_ON(ident != TAG_IDENT_LVD);
1450 lvd = (struct logicalVolDesc *)bh->b_data;
1451 table_len = le32_to_cpu(lvd->mapTableLength);
1452 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1453 udf_err(sb, "error loading logical volume descriptor: "
1454 "Partition table too long (%u > %lu)\n", table_len,
1455 sb->s_blocksize - sizeof(*lvd));
1456 ret = -EIO;
1457 goto out_bh;
1458 }
1459
1460 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1461 "logical volume");
1462 if (ret)
1463 goto out_bh;
1464 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1465 if (ret)
1466 goto out_bh;
1467
1468 for (i = 0, offset = 0;
1469 i < sbi->s_partitions && offset < table_len;
1470 i++, offset += gpm->partitionMapLength) {
1471 struct udf_part_map *map = &sbi->s_partmaps[i];
1472 gpm = (struct genericPartitionMap *)
1473 &(lvd->partitionMaps[offset]);
1474 type = gpm->partitionMapType;
1475 if (type == 1) {
1476 struct genericPartitionMap1 *gpm1 =
1477 (struct genericPartitionMap1 *)gpm;
1478 map->s_partition_type = UDF_TYPE1_MAP15;
1479 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1480 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1481 map->s_partition_func = NULL;
1482 } else if (type == 2) {
1483 struct udfPartitionMap2 *upm2 =
1484 (struct udfPartitionMap2 *)gpm;
1485 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1486 strlen(UDF_ID_VIRTUAL))) {
1487 u16 suf =
1488 le16_to_cpu(((__le16 *)upm2->partIdent.
1489 identSuffix)[0]);
1490 if (suf < 0x0200) {
1491 map->s_partition_type =
1492 UDF_VIRTUAL_MAP15;
1493 map->s_partition_func =
1494 udf_get_pblock_virt15;
1495 } else {
1496 map->s_partition_type =
1497 UDF_VIRTUAL_MAP20;
1498 map->s_partition_func =
1499 udf_get_pblock_virt20;
1500 }
1501 } else if (!strncmp(upm2->partIdent.ident,
1502 UDF_ID_SPARABLE,
1503 strlen(UDF_ID_SPARABLE))) {
1504 ret = udf_load_sparable_map(sb, map,
1505 (struct sparablePartitionMap *)gpm);
1506 if (ret < 0)
1507 goto out_bh;
1508 } else if (!strncmp(upm2->partIdent.ident,
1509 UDF_ID_METADATA,
1510 strlen(UDF_ID_METADATA))) {
1511 struct udf_meta_data *mdata =
1512 &map->s_type_specific.s_metadata;
1513 struct metadataPartitionMap *mdm =
1514 (struct metadataPartitionMap *)
1515 &(lvd->partitionMaps[offset]);
1516 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
1517 i, type, UDF_ID_METADATA);
1518
1519 map->s_partition_type = UDF_METADATA_MAP25;
1520 map->s_partition_func = udf_get_pblock_meta25;
1521
1522 mdata->s_meta_file_loc =
1523 le32_to_cpu(mdm->metadataFileLoc);
1524 mdata->s_mirror_file_loc =
1525 le32_to_cpu(mdm->metadataMirrorFileLoc);
1526 mdata->s_bitmap_file_loc =
1527 le32_to_cpu(mdm->metadataBitmapFileLoc);
1528 mdata->s_alloc_unit_size =
1529 le32_to_cpu(mdm->allocUnitSize);
1530 mdata->s_align_unit_size =
1531 le16_to_cpu(mdm->alignUnitSize);
1532 if (mdm->flags & 0x01)
1533 mdata->s_flags |= MF_DUPLICATE_MD;
1534
1535 udf_debug("Metadata Ident suffix=0x%x\n",
1536 le16_to_cpu(*(__le16 *)
1537 mdm->partIdent.identSuffix));
1538 udf_debug("Metadata part num=%u\n",
1539 le16_to_cpu(mdm->partitionNum));
1540 udf_debug("Metadata part alloc unit size=%u\n",
1541 le32_to_cpu(mdm->allocUnitSize));
1542 udf_debug("Metadata file loc=%u\n",
1543 le32_to_cpu(mdm->metadataFileLoc));
1544 udf_debug("Mirror file loc=%u\n",
1545 le32_to_cpu(mdm->metadataMirrorFileLoc));
1546 udf_debug("Bitmap file loc=%u\n",
1547 le32_to_cpu(mdm->metadataBitmapFileLoc));
1548 udf_debug("Flags: %d %u\n",
1549 mdata->s_flags, mdm->flags);
1550 } else {
1551 udf_debug("Unknown ident: %s\n",
1552 upm2->partIdent.ident);
1553 continue;
1554 }
1555 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1556 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1557 }
1558 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1559 i, map->s_partition_num, type, map->s_volumeseqnum);
1560 }
1561
1562 if (fileset) {
1563 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1564
1565 *fileset = lelb_to_cpu(la->extLocation);
1566 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1567 fileset->logicalBlockNum,
1568 fileset->partitionReferenceNum);
1569 }
1570 if (lvd->integritySeqExt.extLength)
1571 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1572 ret = 0;
1573
1574 if (!sbi->s_lvid_bh) {
1575 /* We can't generate unique IDs without a valid LVID */
1576 if (sb_rdonly(sb)) {
1577 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1578 } else {
1579 udf_warn(sb, "Damaged or missing LVID, forcing "
1580 "readonly mount\n");
1581 ret = -EACCES;
1582 }
1583 }
1584out_bh:
1585 brelse(bh);
1586 return ret;
1587}
1588
1589static bool udf_lvid_valid(struct super_block *sb,
1590 struct logicalVolIntegrityDesc *lvid)
1591{
1592 u32 parts, impuselen;
1593
1594 parts = le32_to_cpu(lvid->numOfPartitions);
1595 impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1596 if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1597 sizeof(struct logicalVolIntegrityDesc) + impuselen +
1598 2 * parts * sizeof(u32) > sb->s_blocksize)
1599 return false;
1600 return true;
1601}
1602
1603/*
1604 * Find the prevailing Logical Volume Integrity Descriptor.
1605 */
1606static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1607{
1608 struct buffer_head *bh, *final_bh;
1609 uint16_t ident;
1610 struct udf_sb_info *sbi = UDF_SB(sb);
1611 struct logicalVolIntegrityDesc *lvid;
1612 int indirections = 0;
1613
1614 while (++indirections <= UDF_MAX_LVID_NESTING) {
1615 final_bh = NULL;
1616 while (loc.extLength > 0 &&
1617 (bh = udf_read_tagged(sb, loc.extLocation,
1618 loc.extLocation, &ident))) {
1619 if (ident != TAG_IDENT_LVID) {
1620 brelse(bh);
1621 break;
1622 }
1623
1624 brelse(final_bh);
1625 final_bh = bh;
1626
1627 loc.extLength -= sb->s_blocksize;
1628 loc.extLocation++;
1629 }
1630
1631 if (!final_bh)
1632 return;
1633
1634 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1635 if (udf_lvid_valid(sb, lvid)) {
1636 brelse(sbi->s_lvid_bh);
1637 sbi->s_lvid_bh = final_bh;
1638 } else {
1639 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1640 "ignoring.\n",
1641 le32_to_cpu(lvid->numOfPartitions),
1642 le32_to_cpu(lvid->lengthOfImpUse));
1643 }
1644
1645 if (lvid->nextIntegrityExt.extLength == 0)
1646 return;
1647
1648 loc = leea_to_cpu(lvid->nextIntegrityExt);
1649 }
1650
1651 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1652 UDF_MAX_LVID_NESTING);
1653 brelse(sbi->s_lvid_bh);
1654 sbi->s_lvid_bh = NULL;
1655}
1656
1657/*
1658 * Step for reallocation of table of partition descriptor sequence numbers.
1659 * Must be power of 2.
1660 */
1661#define PART_DESC_ALLOC_STEP 32
1662
1663struct part_desc_seq_scan_data {
1664 struct udf_vds_record rec;
1665 u32 partnum;
1666};
1667
1668struct desc_seq_scan_data {
1669 struct udf_vds_record vds[VDS_POS_LENGTH];
1670 unsigned int size_part_descs;
1671 unsigned int num_part_descs;
1672 struct part_desc_seq_scan_data *part_descs_loc;
1673};
1674
1675static struct udf_vds_record *handle_partition_descriptor(
1676 struct buffer_head *bh,
1677 struct desc_seq_scan_data *data)
1678{
1679 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1680 int partnum;
1681 int i;
1682
1683 partnum = le16_to_cpu(desc->partitionNumber);
1684 for (i = 0; i < data->num_part_descs; i++)
1685 if (partnum == data->part_descs_loc[i].partnum)
1686 return &(data->part_descs_loc[i].rec);
1687 if (data->num_part_descs >= data->size_part_descs) {
1688 struct part_desc_seq_scan_data *new_loc;
1689 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1690
1691 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL);
1692 if (!new_loc)
1693 return ERR_PTR(-ENOMEM);
1694 memcpy(new_loc, data->part_descs_loc,
1695 data->size_part_descs * sizeof(*new_loc));
1696 kfree(data->part_descs_loc);
1697 data->part_descs_loc = new_loc;
1698 data->size_part_descs = new_size;
1699 }
1700 return &(data->part_descs_loc[data->num_part_descs++].rec);
1701}
1702
1703
1704static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1705 struct buffer_head *bh, struct desc_seq_scan_data *data)
1706{
1707 switch (ident) {
1708 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1709 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1710 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1711 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1712 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1713 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1714 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1715 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1716 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1717 return handle_partition_descriptor(bh, data);
1718 }
1719 return NULL;
1720}
1721
1722/*
1723 * Process a main/reserve volume descriptor sequence.
1724 * @block First block of first extent of the sequence.
1725 * @lastblock Lastblock of first extent of the sequence.
1726 * @fileset There we store extent containing root fileset
1727 *
1728 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1729 * sequence
1730 */
1731static noinline int udf_process_sequence(
1732 struct super_block *sb,
1733 sector_t block, sector_t lastblock,
1734 struct kernel_lb_addr *fileset)
1735{
1736 struct buffer_head *bh = NULL;
1737 struct udf_vds_record *curr;
1738 struct generic_desc *gd;
1739 struct volDescPtr *vdp;
1740 bool done = false;
1741 uint32_t vdsn;
1742 uint16_t ident;
1743 int ret;
1744 unsigned int indirections = 0;
1745 struct desc_seq_scan_data data;
1746 unsigned int i;
1747
1748 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1749 data.size_part_descs = PART_DESC_ALLOC_STEP;
1750 data.num_part_descs = 0;
1751 data.part_descs_loc = kcalloc(data.size_part_descs,
1752 sizeof(*data.part_descs_loc),
1753 GFP_KERNEL);
1754 if (!data.part_descs_loc)
1755 return -ENOMEM;
1756
1757 /*
1758 * Read the main descriptor sequence and find which descriptors
1759 * are in it.
1760 */
1761 for (; (!done && block <= lastblock); block++) {
1762 bh = udf_read_tagged(sb, block, block, &ident);
1763 if (!bh)
1764 break;
1765
1766 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1767 gd = (struct generic_desc *)bh->b_data;
1768 vdsn = le32_to_cpu(gd->volDescSeqNum);
1769 switch (ident) {
1770 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1771 if (++indirections > UDF_MAX_TD_NESTING) {
1772 udf_err(sb, "too many Volume Descriptor "
1773 "Pointers (max %u supported)\n",
1774 UDF_MAX_TD_NESTING);
1775 brelse(bh);
1776 ret = -EIO;
1777 goto out;
1778 }
1779
1780 vdp = (struct volDescPtr *)bh->b_data;
1781 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1782 lastblock = le32_to_cpu(
1783 vdp->nextVolDescSeqExt.extLength) >>
1784 sb->s_blocksize_bits;
1785 lastblock += block - 1;
1786 /* For loop is going to increment 'block' again */
1787 block--;
1788 break;
1789 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1790 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1791 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1792 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1793 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1794 curr = get_volume_descriptor_record(ident, bh, &data);
1795 if (IS_ERR(curr)) {
1796 brelse(bh);
1797 ret = PTR_ERR(curr);
1798 goto out;
1799 }
1800 /* Descriptor we don't care about? */
1801 if (!curr)
1802 break;
1803 if (vdsn >= curr->volDescSeqNum) {
1804 curr->volDescSeqNum = vdsn;
1805 curr->block = block;
1806 }
1807 break;
1808 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1809 done = true;
1810 break;
1811 }
1812 brelse(bh);
1813 }
1814 /*
1815 * Now read interesting descriptors again and process them
1816 * in a suitable order
1817 */
1818 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1819 udf_err(sb, "Primary Volume Descriptor not found!\n");
1820 ret = -EAGAIN;
1821 goto out;
1822 }
1823 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1824 if (ret < 0)
1825 goto out;
1826
1827 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1828 ret = udf_load_logicalvol(sb,
1829 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1830 fileset);
1831 if (ret < 0)
1832 goto out;
1833 }
1834
1835 /* Now handle prevailing Partition Descriptors */
1836 for (i = 0; i < data.num_part_descs; i++) {
1837 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1838 if (ret < 0)
1839 goto out;
1840 }
1841 ret = 0;
1842out:
1843 kfree(data.part_descs_loc);
1844 return ret;
1845}
1846
1847/*
1848 * Load Volume Descriptor Sequence described by anchor in bh
1849 *
1850 * Returns <0 on error, 0 on success
1851 */
1852static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1853 struct kernel_lb_addr *fileset)
1854{
1855 struct anchorVolDescPtr *anchor;
1856 sector_t main_s, main_e, reserve_s, reserve_e;
1857 int ret;
1858
1859 anchor = (struct anchorVolDescPtr *)bh->b_data;
1860
1861 /* Locate the main sequence */
1862 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1863 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1864 main_e = main_e >> sb->s_blocksize_bits;
1865 main_e += main_s - 1;
1866
1867 /* Locate the reserve sequence */
1868 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1869 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1870 reserve_e = reserve_e >> sb->s_blocksize_bits;
1871 reserve_e += reserve_s - 1;
1872
1873 /* Process the main & reserve sequences */
1874 /* responsible for finding the PartitionDesc(s) */
1875 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1876 if (ret != -EAGAIN)
1877 return ret;
1878 udf_sb_free_partitions(sb);
1879 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1880 if (ret < 0) {
1881 udf_sb_free_partitions(sb);
1882 /* No sequence was OK, return -EIO */
1883 if (ret == -EAGAIN)
1884 ret = -EIO;
1885 }
1886 return ret;
1887}
1888
1889/*
1890 * Check whether there is an anchor block in the given block and
1891 * load Volume Descriptor Sequence if so.
1892 *
1893 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1894 * block
1895 */
1896static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1897 struct kernel_lb_addr *fileset)
1898{
1899 struct buffer_head *bh;
1900 uint16_t ident;
1901 int ret;
1902
1903 bh = udf_read_tagged(sb, block, block, &ident);
1904 if (!bh)
1905 return -EAGAIN;
1906 if (ident != TAG_IDENT_AVDP) {
1907 brelse(bh);
1908 return -EAGAIN;
1909 }
1910 ret = udf_load_sequence(sb, bh, fileset);
1911 brelse(bh);
1912 return ret;
1913}
1914
1915/*
1916 * Search for an anchor volume descriptor pointer.
1917 *
1918 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1919 * of anchors.
1920 */
1921static int udf_scan_anchors(struct super_block *sb, udf_pblk_t *lastblock,
1922 struct kernel_lb_addr *fileset)
1923{
1924 udf_pblk_t last[6];
1925 int i;
1926 struct udf_sb_info *sbi = UDF_SB(sb);
1927 int last_count = 0;
1928 int ret;
1929
1930 /* First try user provided anchor */
1931 if (sbi->s_anchor) {
1932 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1933 if (ret != -EAGAIN)
1934 return ret;
1935 }
1936 /*
1937 * according to spec, anchor is in either:
1938 * block 256
1939 * lastblock-256
1940 * lastblock
1941 * however, if the disc isn't closed, it could be 512.
1942 */
1943 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1944 if (ret != -EAGAIN)
1945 return ret;
1946 /*
1947 * The trouble is which block is the last one. Drives often misreport
1948 * this so we try various possibilities.
1949 */
1950 last[last_count++] = *lastblock;
1951 if (*lastblock >= 1)
1952 last[last_count++] = *lastblock - 1;
1953 last[last_count++] = *lastblock + 1;
1954 if (*lastblock >= 2)
1955 last[last_count++] = *lastblock - 2;
1956 if (*lastblock >= 150)
1957 last[last_count++] = *lastblock - 150;
1958 if (*lastblock >= 152)
1959 last[last_count++] = *lastblock - 152;
1960
1961 for (i = 0; i < last_count; i++) {
1962 if (last[i] >= sb_bdev_nr_blocks(sb))
1963 continue;
1964 ret = udf_check_anchor_block(sb, last[i], fileset);
1965 if (ret != -EAGAIN) {
1966 if (!ret)
1967 *lastblock = last[i];
1968 return ret;
1969 }
1970 if (last[i] < 256)
1971 continue;
1972 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1973 if (ret != -EAGAIN) {
1974 if (!ret)
1975 *lastblock = last[i];
1976 return ret;
1977 }
1978 }
1979
1980 /* Finally try block 512 in case media is open */
1981 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1982}
1983
1984/*
1985 * Check Volume Structure Descriptor, find Anchor block and load Volume
1986 * Descriptor Sequence.
1987 *
1988 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1989 * block was not found.
1990 */
1991static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1992 int silent, struct kernel_lb_addr *fileset)
1993{
1994 struct udf_sb_info *sbi = UDF_SB(sb);
1995 int nsr = 0;
1996 int ret;
1997
1998 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1999 if (!silent)
2000 udf_warn(sb, "Bad block size\n");
2001 return -EINVAL;
2002 }
2003 sbi->s_last_block = uopt->lastblock;
2004 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_NOVRS)) {
2005 /* Check that it is NSR02 compliant */
2006 nsr = udf_check_vsd(sb);
2007 if (!nsr) {
2008 if (!silent)
2009 udf_warn(sb, "No VRS found\n");
2010 return -EINVAL;
2011 }
2012 if (nsr == -1)
2013 udf_debug("Failed to read sector at offset %d. "
2014 "Assuming open disc. Skipping validity "
2015 "check\n", VSD_FIRST_SECTOR_OFFSET);
2016 if (!sbi->s_last_block)
2017 sbi->s_last_block = udf_get_last_block(sb);
2018 } else {
2019 udf_debug("Validity check skipped because of novrs option\n");
2020 }
2021
2022 /* Look for anchor block and load Volume Descriptor Sequence */
2023 sbi->s_anchor = uopt->anchor;
2024 ret = udf_scan_anchors(sb, &sbi->s_last_block, fileset);
2025 if (ret < 0) {
2026 if (!silent && ret == -EAGAIN)
2027 udf_warn(sb, "No anchor found\n");
2028 return ret;
2029 }
2030 return 0;
2031}
2032
2033static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2034{
2035 struct timespec64 ts;
2036
2037 ktime_get_real_ts64(&ts);
2038 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2039 lvid->descTag.descCRC = cpu_to_le16(
2040 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2041 le16_to_cpu(lvid->descTag.descCRCLength)));
2042 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2043}
2044
2045static void udf_open_lvid(struct super_block *sb)
2046{
2047 struct udf_sb_info *sbi = UDF_SB(sb);
2048 struct buffer_head *bh = sbi->s_lvid_bh;
2049 struct logicalVolIntegrityDesc *lvid;
2050 struct logicalVolIntegrityDescImpUse *lvidiu;
2051
2052 if (!bh)
2053 return;
2054 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2055 lvidiu = udf_sb_lvidiu(sb);
2056 if (!lvidiu)
2057 return;
2058
2059 mutex_lock(&sbi->s_alloc_mutex);
2060 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2061 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2062 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2063 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2064 else
2065 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2066
2067 udf_finalize_lvid(lvid);
2068 mark_buffer_dirty(bh);
2069 sbi->s_lvid_dirty = 0;
2070 mutex_unlock(&sbi->s_alloc_mutex);
2071 /* Make opening of filesystem visible on the media immediately */
2072 sync_dirty_buffer(bh);
2073}
2074
2075static void udf_close_lvid(struct super_block *sb)
2076{
2077 struct udf_sb_info *sbi = UDF_SB(sb);
2078 struct buffer_head *bh = sbi->s_lvid_bh;
2079 struct logicalVolIntegrityDesc *lvid;
2080 struct logicalVolIntegrityDescImpUse *lvidiu;
2081
2082 if (!bh)
2083 return;
2084 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2085 lvidiu = udf_sb_lvidiu(sb);
2086 if (!lvidiu)
2087 return;
2088
2089 mutex_lock(&sbi->s_alloc_mutex);
2090 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2091 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2092 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2093 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2094 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2095 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2096 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2097 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2098 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2099 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2100
2101 /*
2102 * We set buffer uptodate unconditionally here to avoid spurious
2103 * warnings from mark_buffer_dirty() when previous EIO has marked
2104 * the buffer as !uptodate
2105 */
2106 set_buffer_uptodate(bh);
2107 udf_finalize_lvid(lvid);
2108 mark_buffer_dirty(bh);
2109 sbi->s_lvid_dirty = 0;
2110 mutex_unlock(&sbi->s_alloc_mutex);
2111 /* Make closing of filesystem visible on the media immediately */
2112 sync_dirty_buffer(bh);
2113}
2114
2115u64 lvid_get_unique_id(struct super_block *sb)
2116{
2117 struct buffer_head *bh;
2118 struct udf_sb_info *sbi = UDF_SB(sb);
2119 struct logicalVolIntegrityDesc *lvid;
2120 struct logicalVolHeaderDesc *lvhd;
2121 u64 uniqueID;
2122 u64 ret;
2123
2124 bh = sbi->s_lvid_bh;
2125 if (!bh)
2126 return 0;
2127
2128 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2129 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2130
2131 mutex_lock(&sbi->s_alloc_mutex);
2132 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2133 if (!(++uniqueID & 0xFFFFFFFF))
2134 uniqueID += 16;
2135 lvhd->uniqueID = cpu_to_le64(uniqueID);
2136 udf_updated_lvid(sb);
2137 mutex_unlock(&sbi->s_alloc_mutex);
2138
2139 return ret;
2140}
2141
2142static int udf_fill_super(struct super_block *sb, struct fs_context *fc)
2143{
2144 int ret = -EINVAL;
2145 struct inode *inode = NULL;
2146 struct udf_options *uopt = fc->fs_private;
2147 struct kernel_lb_addr rootdir, fileset;
2148 struct udf_sb_info *sbi;
2149 bool lvid_open = false;
2150 int silent = fc->sb_flags & SB_SILENT;
2151
2152 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2153 if (!sbi)
2154 return -ENOMEM;
2155
2156 sb->s_fs_info = sbi;
2157
2158 mutex_init(&sbi->s_alloc_mutex);
2159
2160 fileset.logicalBlockNum = 0xFFFFFFFF;
2161 fileset.partitionReferenceNum = 0xFFFF;
2162
2163 sbi->s_flags = uopt->flags;
2164 sbi->s_uid = uopt->uid;
2165 sbi->s_gid = uopt->gid;
2166 sbi->s_umask = uopt->umask;
2167 sbi->s_fmode = uopt->fmode;
2168 sbi->s_dmode = uopt->dmode;
2169 sbi->s_nls_map = uopt->nls_map;
2170 uopt->nls_map = NULL;
2171 rwlock_init(&sbi->s_cred_lock);
2172
2173 if (uopt->session == 0xFFFFFFFF)
2174 sbi->s_session = udf_get_last_session(sb);
2175 else
2176 sbi->s_session = uopt->session;
2177
2178 udf_debug("Multi-session=%d\n", sbi->s_session);
2179
2180 /* Fill in the rest of the superblock */
2181 sb->s_op = &udf_sb_ops;
2182 sb->s_export_op = &udf_export_ops;
2183
2184 sb->s_magic = UDF_SUPER_MAGIC;
2185 sb->s_time_gran = 1000;
2186
2187 if (uopt->flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2188 ret = udf_load_vrs(sb, uopt, silent, &fileset);
2189 } else {
2190 uopt->blocksize = bdev_logical_block_size(sb->s_bdev);
2191 while (uopt->blocksize <= 4096) {
2192 ret = udf_load_vrs(sb, uopt, silent, &fileset);
2193 if (ret < 0) {
2194 if (!silent && ret != -EACCES) {
2195 pr_notice("Scanning with blocksize %u failed\n",
2196 uopt->blocksize);
2197 }
2198 brelse(sbi->s_lvid_bh);
2199 sbi->s_lvid_bh = NULL;
2200 /*
2201 * EACCES is special - we want to propagate to
2202 * upper layers that we cannot handle RW mount.
2203 */
2204 if (ret == -EACCES)
2205 break;
2206 } else
2207 break;
2208
2209 uopt->blocksize <<= 1;
2210 }
2211 }
2212 if (ret < 0) {
2213 if (ret == -EAGAIN) {
2214 udf_warn(sb, "No partition found (1)\n");
2215 ret = -EINVAL;
2216 }
2217 goto error_out;
2218 }
2219
2220 udf_debug("Lastblock=%u\n", sbi->s_last_block);
2221
2222 if (sbi->s_lvid_bh) {
2223 struct logicalVolIntegrityDescImpUse *lvidiu =
2224 udf_sb_lvidiu(sb);
2225 uint16_t minUDFReadRev;
2226 uint16_t minUDFWriteRev;
2227
2228 if (!lvidiu) {
2229 ret = -EINVAL;
2230 goto error_out;
2231 }
2232 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2233 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2234 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2235 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2236 minUDFReadRev,
2237 UDF_MAX_READ_VERSION);
2238 ret = -EINVAL;
2239 goto error_out;
2240 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2241 if (!sb_rdonly(sb)) {
2242 ret = -EACCES;
2243 goto error_out;
2244 }
2245 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2246 }
2247
2248 sbi->s_udfrev = minUDFWriteRev;
2249
2250 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2251 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2252 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2253 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2254 }
2255
2256 if (!sbi->s_partitions) {
2257 udf_warn(sb, "No partition found (2)\n");
2258 ret = -EINVAL;
2259 goto error_out;
2260 }
2261
2262 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2263 UDF_PART_FLAG_READ_ONLY) {
2264 if (!sb_rdonly(sb)) {
2265 ret = -EACCES;
2266 goto error_out;
2267 }
2268 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2269 }
2270
2271 ret = udf_find_fileset(sb, &fileset, &rootdir);
2272 if (ret < 0) {
2273 udf_warn(sb, "No fileset found\n");
2274 goto error_out;
2275 }
2276
2277 if (!silent) {
2278 struct timestamp ts;
2279 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2280 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2281 sbi->s_volume_ident,
2282 le16_to_cpu(ts.year), ts.month, ts.day,
2283 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2284 }
2285 if (!sb_rdonly(sb)) {
2286 udf_open_lvid(sb);
2287 lvid_open = true;
2288 }
2289
2290 /* Assign the root inode */
2291 /* assign inodes by physical block number */
2292 /* perhaps it's not extensible enough, but for now ... */
2293 inode = udf_iget(sb, &rootdir);
2294 if (IS_ERR(inode)) {
2295 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2296 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2297 ret = PTR_ERR(inode);
2298 goto error_out;
2299 }
2300
2301 /* Allocate a dentry for the root inode */
2302 sb->s_root = d_make_root(inode);
2303 if (!sb->s_root) {
2304 udf_err(sb, "Couldn't allocate root dentry\n");
2305 ret = -ENOMEM;
2306 goto error_out;
2307 }
2308 sb->s_maxbytes = UDF_MAX_FILESIZE;
2309 sb->s_max_links = UDF_MAX_LINKS;
2310 return 0;
2311
2312error_out:
2313 iput(sbi->s_vat_inode);
2314 unload_nls(uopt->nls_map);
2315 if (lvid_open)
2316 udf_close_lvid(sb);
2317 brelse(sbi->s_lvid_bh);
2318 udf_sb_free_partitions(sb);
2319 kfree(sbi);
2320 sb->s_fs_info = NULL;
2321
2322 return ret;
2323}
2324
2325void _udf_err(struct super_block *sb, const char *function,
2326 const char *fmt, ...)
2327{
2328 struct va_format vaf;
2329 va_list args;
2330
2331 va_start(args, fmt);
2332
2333 vaf.fmt = fmt;
2334 vaf.va = &args;
2335
2336 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2337
2338 va_end(args);
2339}
2340
2341void _udf_warn(struct super_block *sb, const char *function,
2342 const char *fmt, ...)
2343{
2344 struct va_format vaf;
2345 va_list args;
2346
2347 va_start(args, fmt);
2348
2349 vaf.fmt = fmt;
2350 vaf.va = &args;
2351
2352 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2353
2354 va_end(args);
2355}
2356
2357static void udf_put_super(struct super_block *sb)
2358{
2359 struct udf_sb_info *sbi;
2360
2361 sbi = UDF_SB(sb);
2362
2363 iput(sbi->s_vat_inode);
2364 unload_nls(sbi->s_nls_map);
2365 if (!sb_rdonly(sb))
2366 udf_close_lvid(sb);
2367 brelse(sbi->s_lvid_bh);
2368 udf_sb_free_partitions(sb);
2369 mutex_destroy(&sbi->s_alloc_mutex);
2370 kfree(sb->s_fs_info);
2371 sb->s_fs_info = NULL;
2372}
2373
2374static int udf_sync_fs(struct super_block *sb, int wait)
2375{
2376 struct udf_sb_info *sbi = UDF_SB(sb);
2377
2378 mutex_lock(&sbi->s_alloc_mutex);
2379 if (sbi->s_lvid_dirty) {
2380 struct buffer_head *bh = sbi->s_lvid_bh;
2381 struct logicalVolIntegrityDesc *lvid;
2382
2383 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2384 udf_finalize_lvid(lvid);
2385
2386 /*
2387 * Blockdevice will be synced later so we don't have to submit
2388 * the buffer for IO
2389 */
2390 mark_buffer_dirty(bh);
2391 sbi->s_lvid_dirty = 0;
2392 }
2393 mutex_unlock(&sbi->s_alloc_mutex);
2394
2395 return 0;
2396}
2397
2398static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2399{
2400 struct super_block *sb = dentry->d_sb;
2401 struct udf_sb_info *sbi = UDF_SB(sb);
2402 struct logicalVolIntegrityDescImpUse *lvidiu;
2403 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2404
2405 lvidiu = udf_sb_lvidiu(sb);
2406 buf->f_type = UDF_SUPER_MAGIC;
2407 buf->f_bsize = sb->s_blocksize;
2408 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2409 buf->f_bfree = udf_count_free(sb);
2410 buf->f_bavail = buf->f_bfree;
2411 /*
2412 * Let's pretend each free block is also a free 'inode' since UDF does
2413 * not have separate preallocated table of inodes.
2414 */
2415 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2416 le32_to_cpu(lvidiu->numDirs)) : 0)
2417 + buf->f_bfree;
2418 buf->f_ffree = buf->f_bfree;
2419 buf->f_namelen = UDF_NAME_LEN;
2420 buf->f_fsid = u64_to_fsid(id);
2421
2422 return 0;
2423}
2424
2425static unsigned int udf_count_free_bitmap(struct super_block *sb,
2426 struct udf_bitmap *bitmap)
2427{
2428 struct buffer_head *bh = NULL;
2429 unsigned int accum = 0;
2430 int index;
2431 udf_pblk_t block = 0, newblock;
2432 struct kernel_lb_addr loc;
2433 uint32_t bytes;
2434 uint8_t *ptr;
2435 uint16_t ident;
2436 struct spaceBitmapDesc *bm;
2437
2438 loc.logicalBlockNum = bitmap->s_extPosition;
2439 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2440 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2441
2442 if (!bh) {
2443 udf_err(sb, "udf_count_free failed\n");
2444 goto out;
2445 } else if (ident != TAG_IDENT_SBD) {
2446 brelse(bh);
2447 udf_err(sb, "udf_count_free failed\n");
2448 goto out;
2449 }
2450
2451 bm = (struct spaceBitmapDesc *)bh->b_data;
2452 bytes = le32_to_cpu(bm->numOfBytes);
2453 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2454 ptr = (uint8_t *)bh->b_data;
2455
2456 while (bytes > 0) {
2457 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2458 accum += bitmap_weight((const unsigned long *)(ptr + index),
2459 cur_bytes * 8);
2460 bytes -= cur_bytes;
2461 if (bytes) {
2462 brelse(bh);
2463 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2464 bh = sb_bread(sb, newblock);
2465 if (!bh) {
2466 udf_debug("read failed\n");
2467 goto out;
2468 }
2469 index = 0;
2470 ptr = (uint8_t *)bh->b_data;
2471 }
2472 }
2473 brelse(bh);
2474out:
2475 return accum;
2476}
2477
2478static unsigned int udf_count_free_table(struct super_block *sb,
2479 struct inode *table)
2480{
2481 unsigned int accum = 0;
2482 uint32_t elen;
2483 struct kernel_lb_addr eloc;
2484 struct extent_position epos;
2485 int8_t etype;
2486
2487 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2488 epos.block = UDF_I(table)->i_location;
2489 epos.offset = sizeof(struct unallocSpaceEntry);
2490 epos.bh = NULL;
2491
2492 while (udf_next_aext(table, &epos, &eloc, &elen, &etype, 1) > 0)
2493 accum += (elen >> table->i_sb->s_blocksize_bits);
2494
2495 brelse(epos.bh);
2496 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2497
2498 return accum;
2499}
2500
2501static unsigned int udf_count_free(struct super_block *sb)
2502{
2503 unsigned int accum = 0;
2504 struct udf_sb_info *sbi = UDF_SB(sb);
2505 struct udf_part_map *map;
2506 unsigned int part = sbi->s_partition;
2507 int ptype = sbi->s_partmaps[part].s_partition_type;
2508
2509 if (ptype == UDF_METADATA_MAP25) {
2510 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2511 s_phys_partition_ref;
2512 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2513 /*
2514 * Filesystems with VAT are append-only and we cannot write to
2515 * them. Let's just report 0 here.
2516 */
2517 return 0;
2518 }
2519
2520 if (sbi->s_lvid_bh) {
2521 struct logicalVolIntegrityDesc *lvid =
2522 (struct logicalVolIntegrityDesc *)
2523 sbi->s_lvid_bh->b_data;
2524 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2525 accum = le32_to_cpu(
2526 lvid->freeSpaceTable[part]);
2527 if (accum == 0xFFFFFFFF)
2528 accum = 0;
2529 }
2530 }
2531
2532 if (accum)
2533 return accum;
2534
2535 map = &sbi->s_partmaps[part];
2536 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2537 accum += udf_count_free_bitmap(sb,
2538 map->s_uspace.s_bitmap);
2539 }
2540 if (accum)
2541 return accum;
2542
2543 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2544 accum += udf_count_free_table(sb,
2545 map->s_uspace.s_table);
2546 }
2547 return accum;
2548}
2549
2550MODULE_AUTHOR("Ben Fennema");
2551MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2552MODULE_LICENSE("GPL");
2553module_init(init_udf_fs)
2554module_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 * 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
61#include "udf_sb.h"
62#include "udf_i.h"
63
64#include <linux/init.h>
65#include <linux/uaccess.h>
66
67enum {
68 VDS_POS_PRIMARY_VOL_DESC,
69 VDS_POS_UNALLOC_SPACE_DESC,
70 VDS_POS_LOGICAL_VOL_DESC,
71 VDS_POS_IMP_USE_VOL_DESC,
72 VDS_POS_LENGTH
73};
74
75#define VSD_FIRST_SECTOR_OFFSET 32768
76#define VSD_MAX_SECTOR_OFFSET 0x800000
77
78/*
79 * Maximum number of Terminating Descriptor / Logical Volume Integrity
80 * Descriptor redirections. The chosen numbers are arbitrary - just that we
81 * hopefully don't limit any real use of rewritten inode on write-once media
82 * but avoid looping for too long on corrupted media.
83 */
84#define UDF_MAX_TD_NESTING 64
85#define UDF_MAX_LVID_NESTING 1000
86
87enum { UDF_MAX_LINKS = 0xffff };
88
89/* These are the "meat" - everything else is stuffing */
90static int udf_fill_super(struct super_block *, void *, int);
91static void udf_put_super(struct super_block *);
92static int udf_sync_fs(struct super_block *, int);
93static int udf_remount_fs(struct super_block *, int *, char *);
94static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
95static void udf_open_lvid(struct super_block *);
96static void udf_close_lvid(struct super_block *);
97static unsigned int udf_count_free(struct super_block *);
98static int udf_statfs(struct dentry *, struct kstatfs *);
99static int udf_show_options(struct seq_file *, struct dentry *);
100
101struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
102{
103 struct logicalVolIntegrityDesc *lvid;
104 unsigned int partnum;
105 unsigned int offset;
106
107 if (!UDF_SB(sb)->s_lvid_bh)
108 return NULL;
109 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
110 partnum = le32_to_cpu(lvid->numOfPartitions);
111 /* The offset is to skip freeSpaceTable and sizeTable arrays */
112 offset = partnum * 2 * sizeof(uint32_t);
113 return (struct logicalVolIntegrityDescImpUse *)
114 (((uint8_t *)(lvid + 1)) + offset);
115}
116
117/* UDF filesystem type */
118static struct dentry *udf_mount(struct file_system_type *fs_type,
119 int flags, const char *dev_name, void *data)
120{
121 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
122}
123
124static struct file_system_type udf_fstype = {
125 .owner = THIS_MODULE,
126 .name = "udf",
127 .mount = udf_mount,
128 .kill_sb = kill_block_super,
129 .fs_flags = FS_REQUIRES_DEV,
130};
131MODULE_ALIAS_FS("udf");
132
133static struct kmem_cache *udf_inode_cachep;
134
135static struct inode *udf_alloc_inode(struct super_block *sb)
136{
137 struct udf_inode_info *ei;
138 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
139 if (!ei)
140 return NULL;
141
142 ei->i_unique = 0;
143 ei->i_lenExtents = 0;
144 ei->i_lenStreams = 0;
145 ei->i_next_alloc_block = 0;
146 ei->i_next_alloc_goal = 0;
147 ei->i_strat4096 = 0;
148 ei->i_streamdir = 0;
149 init_rwsem(&ei->i_data_sem);
150 ei->cached_extent.lstart = -1;
151 spin_lock_init(&ei->i_extent_cache_lock);
152
153 return &ei->vfs_inode;
154}
155
156static void udf_free_in_core_inode(struct inode *inode)
157{
158 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
159}
160
161static void init_once(void *foo)
162{
163 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
164
165 ei->i_data = NULL;
166 inode_init_once(&ei->vfs_inode);
167}
168
169static int __init init_inodecache(void)
170{
171 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
172 sizeof(struct udf_inode_info),
173 0, (SLAB_RECLAIM_ACCOUNT |
174 SLAB_MEM_SPREAD |
175 SLAB_ACCOUNT),
176 init_once);
177 if (!udf_inode_cachep)
178 return -ENOMEM;
179 return 0;
180}
181
182static void destroy_inodecache(void)
183{
184 /*
185 * Make sure all delayed rcu free inodes are flushed before we
186 * destroy cache.
187 */
188 rcu_barrier();
189 kmem_cache_destroy(udf_inode_cachep);
190}
191
192/* Superblock operations */
193static const struct super_operations udf_sb_ops = {
194 .alloc_inode = udf_alloc_inode,
195 .free_inode = udf_free_in_core_inode,
196 .write_inode = udf_write_inode,
197 .evict_inode = udf_evict_inode,
198 .put_super = udf_put_super,
199 .sync_fs = udf_sync_fs,
200 .statfs = udf_statfs,
201 .remount_fs = udf_remount_fs,
202 .show_options = udf_show_options,
203};
204
205struct udf_options {
206 unsigned char novrs;
207 unsigned int blocksize;
208 unsigned int session;
209 unsigned int lastblock;
210 unsigned int anchor;
211 unsigned int flags;
212 umode_t umask;
213 kgid_t gid;
214 kuid_t uid;
215 umode_t fmode;
216 umode_t dmode;
217 struct nls_table *nls_map;
218};
219
220static int __init init_udf_fs(void)
221{
222 int err;
223
224 err = init_inodecache();
225 if (err)
226 goto out1;
227 err = register_filesystem(&udf_fstype);
228 if (err)
229 goto out;
230
231 return 0;
232
233out:
234 destroy_inodecache();
235
236out1:
237 return err;
238}
239
240static void __exit exit_udf_fs(void)
241{
242 unregister_filesystem(&udf_fstype);
243 destroy_inodecache();
244}
245
246static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
247{
248 struct udf_sb_info *sbi = UDF_SB(sb);
249
250 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
251 if (!sbi->s_partmaps) {
252 sbi->s_partitions = 0;
253 return -ENOMEM;
254 }
255
256 sbi->s_partitions = count;
257 return 0;
258}
259
260static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
261{
262 int i;
263 int nr_groups = bitmap->s_nr_groups;
264
265 for (i = 0; i < nr_groups; i++)
266 brelse(bitmap->s_block_bitmap[i]);
267
268 kvfree(bitmap);
269}
270
271static void udf_free_partition(struct udf_part_map *map)
272{
273 int i;
274 struct udf_meta_data *mdata;
275
276 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
277 iput(map->s_uspace.s_table);
278 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
279 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
280 if (map->s_partition_type == UDF_SPARABLE_MAP15)
281 for (i = 0; i < 4; i++)
282 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
283 else if (map->s_partition_type == UDF_METADATA_MAP25) {
284 mdata = &map->s_type_specific.s_metadata;
285 iput(mdata->s_metadata_fe);
286 mdata->s_metadata_fe = NULL;
287
288 iput(mdata->s_mirror_fe);
289 mdata->s_mirror_fe = NULL;
290
291 iput(mdata->s_bitmap_fe);
292 mdata->s_bitmap_fe = NULL;
293 }
294}
295
296static void udf_sb_free_partitions(struct super_block *sb)
297{
298 struct udf_sb_info *sbi = UDF_SB(sb);
299 int i;
300
301 if (!sbi->s_partmaps)
302 return;
303 for (i = 0; i < sbi->s_partitions; i++)
304 udf_free_partition(&sbi->s_partmaps[i]);
305 kfree(sbi->s_partmaps);
306 sbi->s_partmaps = NULL;
307}
308
309static int udf_show_options(struct seq_file *seq, struct dentry *root)
310{
311 struct super_block *sb = root->d_sb;
312 struct udf_sb_info *sbi = UDF_SB(sb);
313
314 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
315 seq_puts(seq, ",nostrict");
316 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
317 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
318 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
319 seq_puts(seq, ",unhide");
320 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
321 seq_puts(seq, ",undelete");
322 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
323 seq_puts(seq, ",noadinicb");
324 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
325 seq_puts(seq, ",shortad");
326 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
327 seq_puts(seq, ",uid=forget");
328 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
329 seq_puts(seq, ",gid=forget");
330 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
331 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
332 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
333 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
334 if (sbi->s_umask != 0)
335 seq_printf(seq, ",umask=%ho", sbi->s_umask);
336 if (sbi->s_fmode != UDF_INVALID_MODE)
337 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
338 if (sbi->s_dmode != UDF_INVALID_MODE)
339 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
340 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
341 seq_printf(seq, ",session=%d", sbi->s_session);
342 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
343 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
344 if (sbi->s_anchor != 0)
345 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
346 if (sbi->s_nls_map)
347 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
348 else
349 seq_puts(seq, ",iocharset=utf8");
350
351 return 0;
352}
353
354/*
355 * udf_parse_options
356 *
357 * PURPOSE
358 * Parse mount options.
359 *
360 * DESCRIPTION
361 * The following mount options are supported:
362 *
363 * gid= Set the default group.
364 * umask= Set the default umask.
365 * mode= Set the default file permissions.
366 * dmode= Set the default directory permissions.
367 * uid= Set the default user.
368 * bs= Set the block size.
369 * unhide Show otherwise hidden files.
370 * undelete Show deleted files in lists.
371 * adinicb Embed data in the inode (default)
372 * noadinicb Don't embed data in the inode
373 * shortad Use short ad's
374 * longad Use long ad's (default)
375 * nostrict Unset strict conformance
376 * iocharset= Set the NLS character set
377 *
378 * The remaining are for debugging and disaster recovery:
379 *
380 * novrs Skip volume sequence recognition
381 *
382 * The following expect a offset from 0.
383 *
384 * session= Set the CDROM session (default= last session)
385 * anchor= Override standard anchor location. (default= 256)
386 * volume= Override the VolumeDesc location. (unused)
387 * partition= Override the PartitionDesc location. (unused)
388 * lastblock= Set the last block of the filesystem/
389 *
390 * The following expect a offset from the partition root.
391 *
392 * fileset= Override the fileset block location. (unused)
393 * rootdir= Override the root directory location. (unused)
394 * WARNING: overriding the rootdir to a non-directory may
395 * yield highly unpredictable results.
396 *
397 * PRE-CONDITIONS
398 * options Pointer to mount options string.
399 * uopts Pointer to mount options variable.
400 *
401 * POST-CONDITIONS
402 * <return> 1 Mount options parsed okay.
403 * <return> 0 Error parsing mount options.
404 *
405 * HISTORY
406 * July 1, 1997 - Andrew E. Mileski
407 * Written, tested, and released.
408 */
409
410enum {
411 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
412 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
413 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
414 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
415 Opt_rootdir, Opt_utf8, Opt_iocharset,
416 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
417 Opt_fmode, Opt_dmode
418};
419
420static const match_table_t tokens = {
421 {Opt_novrs, "novrs"},
422 {Opt_nostrict, "nostrict"},
423 {Opt_bs, "bs=%u"},
424 {Opt_unhide, "unhide"},
425 {Opt_undelete, "undelete"},
426 {Opt_noadinicb, "noadinicb"},
427 {Opt_adinicb, "adinicb"},
428 {Opt_shortad, "shortad"},
429 {Opt_longad, "longad"},
430 {Opt_uforget, "uid=forget"},
431 {Opt_uignore, "uid=ignore"},
432 {Opt_gforget, "gid=forget"},
433 {Opt_gignore, "gid=ignore"},
434 {Opt_gid, "gid=%u"},
435 {Opt_uid, "uid=%u"},
436 {Opt_umask, "umask=%o"},
437 {Opt_session, "session=%u"},
438 {Opt_lastblock, "lastblock=%u"},
439 {Opt_anchor, "anchor=%u"},
440 {Opt_volume, "volume=%u"},
441 {Opt_partition, "partition=%u"},
442 {Opt_fileset, "fileset=%u"},
443 {Opt_rootdir, "rootdir=%u"},
444 {Opt_utf8, "utf8"},
445 {Opt_iocharset, "iocharset=%s"},
446 {Opt_fmode, "mode=%o"},
447 {Opt_dmode, "dmode=%o"},
448 {Opt_err, NULL}
449};
450
451static int udf_parse_options(char *options, struct udf_options *uopt,
452 bool remount)
453{
454 char *p;
455 int option;
456 unsigned int uv;
457
458 uopt->novrs = 0;
459 uopt->session = 0xFFFFFFFF;
460 uopt->lastblock = 0;
461 uopt->anchor = 0;
462
463 if (!options)
464 return 1;
465
466 while ((p = strsep(&options, ",")) != NULL) {
467 substring_t args[MAX_OPT_ARGS];
468 int token;
469 unsigned n;
470 if (!*p)
471 continue;
472
473 token = match_token(p, tokens, args);
474 switch (token) {
475 case Opt_novrs:
476 uopt->novrs = 1;
477 break;
478 case Opt_bs:
479 if (match_int(&args[0], &option))
480 return 0;
481 n = option;
482 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
483 return 0;
484 uopt->blocksize = n;
485 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
486 break;
487 case Opt_unhide:
488 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
489 break;
490 case Opt_undelete:
491 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
492 break;
493 case Opt_noadinicb:
494 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
495 break;
496 case Opt_adinicb:
497 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
498 break;
499 case Opt_shortad:
500 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
501 break;
502 case Opt_longad:
503 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
504 break;
505 case Opt_gid:
506 if (match_uint(args, &uv))
507 return 0;
508 uopt->gid = make_kgid(current_user_ns(), uv);
509 if (!gid_valid(uopt->gid))
510 return 0;
511 uopt->flags |= (1 << UDF_FLAG_GID_SET);
512 break;
513 case Opt_uid:
514 if (match_uint(args, &uv))
515 return 0;
516 uopt->uid = make_kuid(current_user_ns(), uv);
517 if (!uid_valid(uopt->uid))
518 return 0;
519 uopt->flags |= (1 << UDF_FLAG_UID_SET);
520 break;
521 case Opt_umask:
522 if (match_octal(args, &option))
523 return 0;
524 uopt->umask = option;
525 break;
526 case Opt_nostrict:
527 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
528 break;
529 case Opt_session:
530 if (match_int(args, &option))
531 return 0;
532 uopt->session = option;
533 if (!remount)
534 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
535 break;
536 case Opt_lastblock:
537 if (match_int(args, &option))
538 return 0;
539 uopt->lastblock = option;
540 if (!remount)
541 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
542 break;
543 case Opt_anchor:
544 if (match_int(args, &option))
545 return 0;
546 uopt->anchor = option;
547 break;
548 case Opt_volume:
549 case Opt_partition:
550 case Opt_fileset:
551 case Opt_rootdir:
552 /* Ignored (never implemented properly) */
553 break;
554 case Opt_utf8:
555 if (!remount) {
556 unload_nls(uopt->nls_map);
557 uopt->nls_map = NULL;
558 }
559 break;
560 case Opt_iocharset:
561 if (!remount) {
562 unload_nls(uopt->nls_map);
563 uopt->nls_map = NULL;
564 }
565 /* When nls_map is not loaded then UTF-8 is used */
566 if (!remount && strcmp(args[0].from, "utf8") != 0) {
567 uopt->nls_map = load_nls(args[0].from);
568 if (!uopt->nls_map) {
569 pr_err("iocharset %s not found\n",
570 args[0].from);
571 return 0;
572 }
573 }
574 break;
575 case Opt_uforget:
576 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
577 break;
578 case Opt_uignore:
579 case Opt_gignore:
580 /* These options are superseeded by uid=<number> */
581 break;
582 case Opt_gforget:
583 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
584 break;
585 case Opt_fmode:
586 if (match_octal(args, &option))
587 return 0;
588 uopt->fmode = option & 0777;
589 break;
590 case Opt_dmode:
591 if (match_octal(args, &option))
592 return 0;
593 uopt->dmode = option & 0777;
594 break;
595 default:
596 pr_err("bad mount option \"%s\" or missing value\n", p);
597 return 0;
598 }
599 }
600 return 1;
601}
602
603static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
604{
605 struct udf_options uopt;
606 struct udf_sb_info *sbi = UDF_SB(sb);
607 int error = 0;
608
609 if (!(*flags & SB_RDONLY) && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
610 return -EACCES;
611
612 sync_filesystem(sb);
613
614 uopt.flags = sbi->s_flags;
615 uopt.uid = sbi->s_uid;
616 uopt.gid = sbi->s_gid;
617 uopt.umask = sbi->s_umask;
618 uopt.fmode = sbi->s_fmode;
619 uopt.dmode = sbi->s_dmode;
620 uopt.nls_map = NULL;
621
622 if (!udf_parse_options(options, &uopt, true))
623 return -EINVAL;
624
625 write_lock(&sbi->s_cred_lock);
626 sbi->s_flags = uopt.flags;
627 sbi->s_uid = uopt.uid;
628 sbi->s_gid = uopt.gid;
629 sbi->s_umask = uopt.umask;
630 sbi->s_fmode = uopt.fmode;
631 sbi->s_dmode = uopt.dmode;
632 write_unlock(&sbi->s_cred_lock);
633
634 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
635 goto out_unlock;
636
637 if (*flags & SB_RDONLY)
638 udf_close_lvid(sb);
639 else
640 udf_open_lvid(sb);
641
642out_unlock:
643 return error;
644}
645
646/*
647 * Check VSD descriptor. Returns -1 in case we are at the end of volume
648 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if
649 * we found one of NSR descriptors we are looking for.
650 */
651static int identify_vsd(const struct volStructDesc *vsd)
652{
653 int ret = 0;
654
655 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
656 switch (vsd->structType) {
657 case 0:
658 udf_debug("ISO9660 Boot Record found\n");
659 break;
660 case 1:
661 udf_debug("ISO9660 Primary Volume Descriptor found\n");
662 break;
663 case 2:
664 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
665 break;
666 case 3:
667 udf_debug("ISO9660 Volume Partition Descriptor found\n");
668 break;
669 case 255:
670 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
671 break;
672 default:
673 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
674 break;
675 }
676 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
677 ; /* ret = 0 */
678 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
679 ret = 1;
680 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
681 ret = 1;
682 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
683 ; /* ret = 0 */
684 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
685 ; /* ret = 0 */
686 else {
687 /* TEA01 or invalid id : end of volume recognition area */
688 ret = -1;
689 }
690
691 return ret;
692}
693
694/*
695 * Check Volume Structure Descriptors (ECMA 167 2/9.1)
696 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
697 * @return 1 if NSR02 or NSR03 found,
698 * -1 if first sector read error, 0 otherwise
699 */
700static int udf_check_vsd(struct super_block *sb)
701{
702 struct volStructDesc *vsd = NULL;
703 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
704 int sectorsize;
705 struct buffer_head *bh = NULL;
706 int nsr = 0;
707 struct udf_sb_info *sbi;
708 loff_t session_offset;
709
710 sbi = UDF_SB(sb);
711 if (sb->s_blocksize < sizeof(struct volStructDesc))
712 sectorsize = sizeof(struct volStructDesc);
713 else
714 sectorsize = sb->s_blocksize;
715
716 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
717 sector += session_offset;
718
719 udf_debug("Starting at sector %u (%lu byte sectors)\n",
720 (unsigned int)(sector >> sb->s_blocksize_bits),
721 sb->s_blocksize);
722 /* Process the sequence (if applicable). The hard limit on the sector
723 * offset is arbitrary, hopefully large enough so that all valid UDF
724 * filesystems will be recognised. There is no mention of an upper
725 * bound to the size of the volume recognition area in the standard.
726 * The limit will prevent the code to read all the sectors of a
727 * specially crafted image (like a bluray disc full of CD001 sectors),
728 * potentially causing minutes or even hours of uninterruptible I/O
729 * activity. This actually happened with uninitialised SSD partitions
730 * (all 0xFF) before the check for the limit and all valid IDs were
731 * added */
732 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
733 /* Read a block */
734 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
735 if (!bh)
736 break;
737
738 vsd = (struct volStructDesc *)(bh->b_data +
739 (sector & (sb->s_blocksize - 1)));
740 nsr = identify_vsd(vsd);
741 /* Found NSR or end? */
742 if (nsr) {
743 brelse(bh);
744 break;
745 }
746 /*
747 * Special handling for improperly formatted VRS (e.g., Win10)
748 * where components are separated by 2048 bytes even though
749 * sectors are 4K
750 */
751 if (sb->s_blocksize == 4096) {
752 nsr = identify_vsd(vsd + 1);
753 /* Ignore unknown IDs... */
754 if (nsr < 0)
755 nsr = 0;
756 }
757 brelse(bh);
758 }
759
760 if (nsr > 0)
761 return 1;
762 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
763 return -1;
764 else
765 return 0;
766}
767
768static int udf_verify_domain_identifier(struct super_block *sb,
769 struct regid *ident, char *dname)
770{
771 struct domainIdentSuffix *suffix;
772
773 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
774 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
775 goto force_ro;
776 }
777 if (ident->flags & ENTITYID_FLAGS_DIRTY) {
778 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
779 dname);
780 goto force_ro;
781 }
782 suffix = (struct domainIdentSuffix *)ident->identSuffix;
783 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
784 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
785 if (!sb_rdonly(sb)) {
786 udf_warn(sb, "Descriptor for %s marked write protected."
787 " Forcing read only mount.\n", dname);
788 }
789 goto force_ro;
790 }
791 return 0;
792
793force_ro:
794 if (!sb_rdonly(sb))
795 return -EACCES;
796 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
797 return 0;
798}
799
800static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
801 struct kernel_lb_addr *root)
802{
803 int ret;
804
805 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
806 if (ret < 0)
807 return ret;
808
809 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
810 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
811
812 udf_debug("Rootdir at block=%u, partition=%u\n",
813 root->logicalBlockNum, root->partitionReferenceNum);
814 return 0;
815}
816
817static int udf_find_fileset(struct super_block *sb,
818 struct kernel_lb_addr *fileset,
819 struct kernel_lb_addr *root)
820{
821 struct buffer_head *bh = NULL;
822 uint16_t ident;
823 int ret;
824
825 if (fileset->logicalBlockNum == 0xFFFFFFFF &&
826 fileset->partitionReferenceNum == 0xFFFF)
827 return -EINVAL;
828
829 bh = udf_read_ptagged(sb, fileset, 0, &ident);
830 if (!bh)
831 return -EIO;
832 if (ident != TAG_IDENT_FSD) {
833 brelse(bh);
834 return -EINVAL;
835 }
836
837 udf_debug("Fileset at block=%u, partition=%u\n",
838 fileset->logicalBlockNum, fileset->partitionReferenceNum);
839
840 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
841 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
842 brelse(bh);
843 return ret;
844}
845
846/*
847 * Load primary Volume Descriptor Sequence
848 *
849 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
850 * should be tried.
851 */
852static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
853{
854 struct primaryVolDesc *pvoldesc;
855 uint8_t *outstr;
856 struct buffer_head *bh;
857 uint16_t ident;
858 int ret;
859 struct timestamp *ts;
860
861 outstr = kmalloc(128, GFP_NOFS);
862 if (!outstr)
863 return -ENOMEM;
864
865 bh = udf_read_tagged(sb, block, block, &ident);
866 if (!bh) {
867 ret = -EAGAIN;
868 goto out2;
869 }
870
871 if (ident != TAG_IDENT_PVD) {
872 ret = -EIO;
873 goto out_bh;
874 }
875
876 pvoldesc = (struct primaryVolDesc *)bh->b_data;
877
878 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
879 pvoldesc->recordingDateAndTime);
880 ts = &pvoldesc->recordingDateAndTime;
881 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
882 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
883 ts->minute, le16_to_cpu(ts->typeAndTimezone));
884
885 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
886 if (ret < 0) {
887 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
888 pr_warn("incorrect volume identification, setting to "
889 "'InvalidName'\n");
890 } else {
891 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
892 }
893 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
894
895 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
896 if (ret < 0) {
897 ret = 0;
898 goto out_bh;
899 }
900 outstr[ret] = 0;
901 udf_debug("volSetIdent[] = '%s'\n", outstr);
902
903 ret = 0;
904out_bh:
905 brelse(bh);
906out2:
907 kfree(outstr);
908 return ret;
909}
910
911struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
912 u32 meta_file_loc, u32 partition_ref)
913{
914 struct kernel_lb_addr addr;
915 struct inode *metadata_fe;
916
917 addr.logicalBlockNum = meta_file_loc;
918 addr.partitionReferenceNum = partition_ref;
919
920 metadata_fe = udf_iget_special(sb, &addr);
921
922 if (IS_ERR(metadata_fe)) {
923 udf_warn(sb, "metadata inode efe not found\n");
924 return metadata_fe;
925 }
926 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
927 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
928 iput(metadata_fe);
929 return ERR_PTR(-EIO);
930 }
931
932 return metadata_fe;
933}
934
935static int udf_load_metadata_files(struct super_block *sb, int partition,
936 int type1_index)
937{
938 struct udf_sb_info *sbi = UDF_SB(sb);
939 struct udf_part_map *map;
940 struct udf_meta_data *mdata;
941 struct kernel_lb_addr addr;
942 struct inode *fe;
943
944 map = &sbi->s_partmaps[partition];
945 mdata = &map->s_type_specific.s_metadata;
946 mdata->s_phys_partition_ref = type1_index;
947
948 /* metadata address */
949 udf_debug("Metadata file location: block = %u part = %u\n",
950 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
951
952 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
953 mdata->s_phys_partition_ref);
954 if (IS_ERR(fe)) {
955 /* mirror file entry */
956 udf_debug("Mirror metadata file location: block = %u part = %u\n",
957 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
958
959 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
960 mdata->s_phys_partition_ref);
961
962 if (IS_ERR(fe)) {
963 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
964 return PTR_ERR(fe);
965 }
966 mdata->s_mirror_fe = fe;
967 } else
968 mdata->s_metadata_fe = fe;
969
970
971 /*
972 * bitmap file entry
973 * Note:
974 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
975 */
976 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
977 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
978 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
979
980 udf_debug("Bitmap file location: block = %u part = %u\n",
981 addr.logicalBlockNum, addr.partitionReferenceNum);
982
983 fe = udf_iget_special(sb, &addr);
984 if (IS_ERR(fe)) {
985 if (sb_rdonly(sb))
986 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
987 else {
988 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
989 return PTR_ERR(fe);
990 }
991 } else
992 mdata->s_bitmap_fe = fe;
993 }
994
995 udf_debug("udf_load_metadata_files Ok\n");
996 return 0;
997}
998
999int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1000{
1001 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1002 return DIV_ROUND_UP(map->s_partition_len +
1003 (sizeof(struct spaceBitmapDesc) << 3),
1004 sb->s_blocksize * 8);
1005}
1006
1007static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1008{
1009 struct udf_bitmap *bitmap;
1010 int nr_groups = udf_compute_nr_groups(sb, index);
1011
1012 bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
1013 GFP_KERNEL);
1014 if (!bitmap)
1015 return NULL;
1016
1017 bitmap->s_nr_groups = nr_groups;
1018 return bitmap;
1019}
1020
1021static int check_partition_desc(struct super_block *sb,
1022 struct partitionDesc *p,
1023 struct udf_part_map *map)
1024{
1025 bool umap, utable, fmap, ftable;
1026 struct partitionHeaderDesc *phd;
1027
1028 switch (le32_to_cpu(p->accessType)) {
1029 case PD_ACCESS_TYPE_READ_ONLY:
1030 case PD_ACCESS_TYPE_WRITE_ONCE:
1031 case PD_ACCESS_TYPE_NONE:
1032 goto force_ro;
1033 }
1034
1035 /* No Partition Header Descriptor? */
1036 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1037 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1038 goto force_ro;
1039
1040 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1041 utable = phd->unallocSpaceTable.extLength;
1042 umap = phd->unallocSpaceBitmap.extLength;
1043 ftable = phd->freedSpaceTable.extLength;
1044 fmap = phd->freedSpaceBitmap.extLength;
1045
1046 /* No allocation info? */
1047 if (!utable && !umap && !ftable && !fmap)
1048 goto force_ro;
1049
1050 /* We don't support blocks that require erasing before overwrite */
1051 if (ftable || fmap)
1052 goto force_ro;
1053 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1054 if (utable && umap)
1055 goto force_ro;
1056
1057 if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1058 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1059 map->s_partition_type == UDF_METADATA_MAP25)
1060 goto force_ro;
1061
1062 return 0;
1063force_ro:
1064 if (!sb_rdonly(sb))
1065 return -EACCES;
1066 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1067 return 0;
1068}
1069
1070static int udf_fill_partdesc_info(struct super_block *sb,
1071 struct partitionDesc *p, int p_index)
1072{
1073 struct udf_part_map *map;
1074 struct udf_sb_info *sbi = UDF_SB(sb);
1075 struct partitionHeaderDesc *phd;
1076 int err;
1077
1078 map = &sbi->s_partmaps[p_index];
1079
1080 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1081 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1082
1083 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1084 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1085 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1086 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1087 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1088 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1089 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1090 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1091
1092 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1093 p_index, map->s_partition_type,
1094 map->s_partition_root, map->s_partition_len);
1095
1096 err = check_partition_desc(sb, p, map);
1097 if (err)
1098 return err;
1099
1100 /*
1101 * Skip loading allocation info it we cannot ever write to the fs.
1102 * This is a correctness thing as we may have decided to force ro mount
1103 * to avoid allocation info we don't support.
1104 */
1105 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1106 return 0;
1107
1108 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1109 if (phd->unallocSpaceTable.extLength) {
1110 struct kernel_lb_addr loc = {
1111 .logicalBlockNum = le32_to_cpu(
1112 phd->unallocSpaceTable.extPosition),
1113 .partitionReferenceNum = p_index,
1114 };
1115 struct inode *inode;
1116
1117 inode = udf_iget_special(sb, &loc);
1118 if (IS_ERR(inode)) {
1119 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1120 p_index);
1121 return PTR_ERR(inode);
1122 }
1123 map->s_uspace.s_table = inode;
1124 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1125 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1126 p_index, map->s_uspace.s_table->i_ino);
1127 }
1128
1129 if (phd->unallocSpaceBitmap.extLength) {
1130 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1131 if (!bitmap)
1132 return -ENOMEM;
1133 map->s_uspace.s_bitmap = bitmap;
1134 bitmap->s_extPosition = le32_to_cpu(
1135 phd->unallocSpaceBitmap.extPosition);
1136 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1137 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1138 p_index, bitmap->s_extPosition);
1139 }
1140
1141 return 0;
1142}
1143
1144static void udf_find_vat_block(struct super_block *sb, int p_index,
1145 int type1_index, sector_t start_block)
1146{
1147 struct udf_sb_info *sbi = UDF_SB(sb);
1148 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1149 sector_t vat_block;
1150 struct kernel_lb_addr ino;
1151 struct inode *inode;
1152
1153 /*
1154 * VAT file entry is in the last recorded block. Some broken disks have
1155 * it a few blocks before so try a bit harder...
1156 */
1157 ino.partitionReferenceNum = type1_index;
1158 for (vat_block = start_block;
1159 vat_block >= map->s_partition_root &&
1160 vat_block >= start_block - 3; vat_block--) {
1161 ino.logicalBlockNum = vat_block - map->s_partition_root;
1162 inode = udf_iget_special(sb, &ino);
1163 if (!IS_ERR(inode)) {
1164 sbi->s_vat_inode = inode;
1165 break;
1166 }
1167 }
1168}
1169
1170static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1171{
1172 struct udf_sb_info *sbi = UDF_SB(sb);
1173 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1174 struct buffer_head *bh = NULL;
1175 struct udf_inode_info *vati;
1176 uint32_t pos;
1177 struct virtualAllocationTable20 *vat20;
1178 sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1179 sb->s_blocksize_bits;
1180
1181 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1182 if (!sbi->s_vat_inode &&
1183 sbi->s_last_block != blocks - 1) {
1184 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1185 (unsigned long)sbi->s_last_block,
1186 (unsigned long)blocks - 1);
1187 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1188 }
1189 if (!sbi->s_vat_inode)
1190 return -EIO;
1191
1192 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1193 map->s_type_specific.s_virtual.s_start_offset = 0;
1194 map->s_type_specific.s_virtual.s_num_entries =
1195 (sbi->s_vat_inode->i_size - 36) >> 2;
1196 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1197 vati = UDF_I(sbi->s_vat_inode);
1198 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1199 pos = udf_block_map(sbi->s_vat_inode, 0);
1200 bh = sb_bread(sb, pos);
1201 if (!bh)
1202 return -EIO;
1203 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1204 } else {
1205 vat20 = (struct virtualAllocationTable20 *)
1206 vati->i_data;
1207 }
1208
1209 map->s_type_specific.s_virtual.s_start_offset =
1210 le16_to_cpu(vat20->lengthHeader);
1211 map->s_type_specific.s_virtual.s_num_entries =
1212 (sbi->s_vat_inode->i_size -
1213 map->s_type_specific.s_virtual.
1214 s_start_offset) >> 2;
1215 brelse(bh);
1216 }
1217 return 0;
1218}
1219
1220/*
1221 * Load partition descriptor block
1222 *
1223 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1224 * sequence.
1225 */
1226static int udf_load_partdesc(struct super_block *sb, sector_t block)
1227{
1228 struct buffer_head *bh;
1229 struct partitionDesc *p;
1230 struct udf_part_map *map;
1231 struct udf_sb_info *sbi = UDF_SB(sb);
1232 int i, type1_idx;
1233 uint16_t partitionNumber;
1234 uint16_t ident;
1235 int ret;
1236
1237 bh = udf_read_tagged(sb, block, block, &ident);
1238 if (!bh)
1239 return -EAGAIN;
1240 if (ident != TAG_IDENT_PD) {
1241 ret = 0;
1242 goto out_bh;
1243 }
1244
1245 p = (struct partitionDesc *)bh->b_data;
1246 partitionNumber = le16_to_cpu(p->partitionNumber);
1247
1248 /* First scan for TYPE1 and SPARABLE partitions */
1249 for (i = 0; i < sbi->s_partitions; i++) {
1250 map = &sbi->s_partmaps[i];
1251 udf_debug("Searching map: (%u == %u)\n",
1252 map->s_partition_num, partitionNumber);
1253 if (map->s_partition_num == partitionNumber &&
1254 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1255 map->s_partition_type == UDF_SPARABLE_MAP15))
1256 break;
1257 }
1258
1259 if (i >= sbi->s_partitions) {
1260 udf_debug("Partition (%u) not found in partition map\n",
1261 partitionNumber);
1262 ret = 0;
1263 goto out_bh;
1264 }
1265
1266 ret = udf_fill_partdesc_info(sb, p, i);
1267 if (ret < 0)
1268 goto out_bh;
1269
1270 /*
1271 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1272 * PHYSICAL partitions are already set up
1273 */
1274 type1_idx = i;
1275 map = NULL; /* supress 'maybe used uninitialized' warning */
1276 for (i = 0; i < sbi->s_partitions; i++) {
1277 map = &sbi->s_partmaps[i];
1278
1279 if (map->s_partition_num == partitionNumber &&
1280 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1281 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1282 map->s_partition_type == UDF_METADATA_MAP25))
1283 break;
1284 }
1285
1286 if (i >= sbi->s_partitions) {
1287 ret = 0;
1288 goto out_bh;
1289 }
1290
1291 ret = udf_fill_partdesc_info(sb, p, i);
1292 if (ret < 0)
1293 goto out_bh;
1294
1295 if (map->s_partition_type == UDF_METADATA_MAP25) {
1296 ret = udf_load_metadata_files(sb, i, type1_idx);
1297 if (ret < 0) {
1298 udf_err(sb, "error loading MetaData partition map %d\n",
1299 i);
1300 goto out_bh;
1301 }
1302 } else {
1303 /*
1304 * If we have a partition with virtual map, we don't handle
1305 * writing to it (we overwrite blocks instead of relocating
1306 * them).
1307 */
1308 if (!sb_rdonly(sb)) {
1309 ret = -EACCES;
1310 goto out_bh;
1311 }
1312 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1313 ret = udf_load_vat(sb, i, type1_idx);
1314 if (ret < 0)
1315 goto out_bh;
1316 }
1317 ret = 0;
1318out_bh:
1319 /* In case loading failed, we handle cleanup in udf_fill_super */
1320 brelse(bh);
1321 return ret;
1322}
1323
1324static int udf_load_sparable_map(struct super_block *sb,
1325 struct udf_part_map *map,
1326 struct sparablePartitionMap *spm)
1327{
1328 uint32_t loc;
1329 uint16_t ident;
1330 struct sparingTable *st;
1331 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1332 int i;
1333 struct buffer_head *bh;
1334
1335 map->s_partition_type = UDF_SPARABLE_MAP15;
1336 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1337 if (!is_power_of_2(sdata->s_packet_len)) {
1338 udf_err(sb, "error loading logical volume descriptor: "
1339 "Invalid packet length %u\n",
1340 (unsigned)sdata->s_packet_len);
1341 return -EIO;
1342 }
1343 if (spm->numSparingTables > 4) {
1344 udf_err(sb, "error loading logical volume descriptor: "
1345 "Too many sparing tables (%d)\n",
1346 (int)spm->numSparingTables);
1347 return -EIO;
1348 }
1349 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1350 udf_err(sb, "error loading logical volume descriptor: "
1351 "Too big sparing table size (%u)\n",
1352 le32_to_cpu(spm->sizeSparingTable));
1353 return -EIO;
1354 }
1355
1356 for (i = 0; i < spm->numSparingTables; i++) {
1357 loc = le32_to_cpu(spm->locSparingTable[i]);
1358 bh = udf_read_tagged(sb, loc, loc, &ident);
1359 if (!bh)
1360 continue;
1361
1362 st = (struct sparingTable *)bh->b_data;
1363 if (ident != 0 ||
1364 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1365 strlen(UDF_ID_SPARING)) ||
1366 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1367 sb->s_blocksize) {
1368 brelse(bh);
1369 continue;
1370 }
1371
1372 sdata->s_spar_map[i] = bh;
1373 }
1374 map->s_partition_func = udf_get_pblock_spar15;
1375 return 0;
1376}
1377
1378static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1379 struct kernel_lb_addr *fileset)
1380{
1381 struct logicalVolDesc *lvd;
1382 int i, offset;
1383 uint8_t type;
1384 struct udf_sb_info *sbi = UDF_SB(sb);
1385 struct genericPartitionMap *gpm;
1386 uint16_t ident;
1387 struct buffer_head *bh;
1388 unsigned int table_len;
1389 int ret;
1390
1391 bh = udf_read_tagged(sb, block, block, &ident);
1392 if (!bh)
1393 return -EAGAIN;
1394 BUG_ON(ident != TAG_IDENT_LVD);
1395 lvd = (struct logicalVolDesc *)bh->b_data;
1396 table_len = le32_to_cpu(lvd->mapTableLength);
1397 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1398 udf_err(sb, "error loading logical volume descriptor: "
1399 "Partition table too long (%u > %lu)\n", table_len,
1400 sb->s_blocksize - sizeof(*lvd));
1401 ret = -EIO;
1402 goto out_bh;
1403 }
1404
1405 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1406 "logical volume");
1407 if (ret)
1408 goto out_bh;
1409 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1410 if (ret)
1411 goto out_bh;
1412
1413 for (i = 0, offset = 0;
1414 i < sbi->s_partitions && offset < table_len;
1415 i++, offset += gpm->partitionMapLength) {
1416 struct udf_part_map *map = &sbi->s_partmaps[i];
1417 gpm = (struct genericPartitionMap *)
1418 &(lvd->partitionMaps[offset]);
1419 type = gpm->partitionMapType;
1420 if (type == 1) {
1421 struct genericPartitionMap1 *gpm1 =
1422 (struct genericPartitionMap1 *)gpm;
1423 map->s_partition_type = UDF_TYPE1_MAP15;
1424 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1425 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1426 map->s_partition_func = NULL;
1427 } else if (type == 2) {
1428 struct udfPartitionMap2 *upm2 =
1429 (struct udfPartitionMap2 *)gpm;
1430 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1431 strlen(UDF_ID_VIRTUAL))) {
1432 u16 suf =
1433 le16_to_cpu(((__le16 *)upm2->partIdent.
1434 identSuffix)[0]);
1435 if (suf < 0x0200) {
1436 map->s_partition_type =
1437 UDF_VIRTUAL_MAP15;
1438 map->s_partition_func =
1439 udf_get_pblock_virt15;
1440 } else {
1441 map->s_partition_type =
1442 UDF_VIRTUAL_MAP20;
1443 map->s_partition_func =
1444 udf_get_pblock_virt20;
1445 }
1446 } else if (!strncmp(upm2->partIdent.ident,
1447 UDF_ID_SPARABLE,
1448 strlen(UDF_ID_SPARABLE))) {
1449 ret = udf_load_sparable_map(sb, map,
1450 (struct sparablePartitionMap *)gpm);
1451 if (ret < 0)
1452 goto out_bh;
1453 } else if (!strncmp(upm2->partIdent.ident,
1454 UDF_ID_METADATA,
1455 strlen(UDF_ID_METADATA))) {
1456 struct udf_meta_data *mdata =
1457 &map->s_type_specific.s_metadata;
1458 struct metadataPartitionMap *mdm =
1459 (struct metadataPartitionMap *)
1460 &(lvd->partitionMaps[offset]);
1461 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
1462 i, type, UDF_ID_METADATA);
1463
1464 map->s_partition_type = UDF_METADATA_MAP25;
1465 map->s_partition_func = udf_get_pblock_meta25;
1466
1467 mdata->s_meta_file_loc =
1468 le32_to_cpu(mdm->metadataFileLoc);
1469 mdata->s_mirror_file_loc =
1470 le32_to_cpu(mdm->metadataMirrorFileLoc);
1471 mdata->s_bitmap_file_loc =
1472 le32_to_cpu(mdm->metadataBitmapFileLoc);
1473 mdata->s_alloc_unit_size =
1474 le32_to_cpu(mdm->allocUnitSize);
1475 mdata->s_align_unit_size =
1476 le16_to_cpu(mdm->alignUnitSize);
1477 if (mdm->flags & 0x01)
1478 mdata->s_flags |= MF_DUPLICATE_MD;
1479
1480 udf_debug("Metadata Ident suffix=0x%x\n",
1481 le16_to_cpu(*(__le16 *)
1482 mdm->partIdent.identSuffix));
1483 udf_debug("Metadata part num=%u\n",
1484 le16_to_cpu(mdm->partitionNum));
1485 udf_debug("Metadata part alloc unit size=%u\n",
1486 le32_to_cpu(mdm->allocUnitSize));
1487 udf_debug("Metadata file loc=%u\n",
1488 le32_to_cpu(mdm->metadataFileLoc));
1489 udf_debug("Mirror file loc=%u\n",
1490 le32_to_cpu(mdm->metadataMirrorFileLoc));
1491 udf_debug("Bitmap file loc=%u\n",
1492 le32_to_cpu(mdm->metadataBitmapFileLoc));
1493 udf_debug("Flags: %d %u\n",
1494 mdata->s_flags, mdm->flags);
1495 } else {
1496 udf_debug("Unknown ident: %s\n",
1497 upm2->partIdent.ident);
1498 continue;
1499 }
1500 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1501 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1502 }
1503 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1504 i, map->s_partition_num, type, map->s_volumeseqnum);
1505 }
1506
1507 if (fileset) {
1508 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1509
1510 *fileset = lelb_to_cpu(la->extLocation);
1511 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1512 fileset->logicalBlockNum,
1513 fileset->partitionReferenceNum);
1514 }
1515 if (lvd->integritySeqExt.extLength)
1516 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1517 ret = 0;
1518
1519 if (!sbi->s_lvid_bh) {
1520 /* We can't generate unique IDs without a valid LVID */
1521 if (sb_rdonly(sb)) {
1522 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1523 } else {
1524 udf_warn(sb, "Damaged or missing LVID, forcing "
1525 "readonly mount\n");
1526 ret = -EACCES;
1527 }
1528 }
1529out_bh:
1530 brelse(bh);
1531 return ret;
1532}
1533
1534/*
1535 * Find the prevailing Logical Volume Integrity Descriptor.
1536 */
1537static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1538{
1539 struct buffer_head *bh, *final_bh;
1540 uint16_t ident;
1541 struct udf_sb_info *sbi = UDF_SB(sb);
1542 struct logicalVolIntegrityDesc *lvid;
1543 int indirections = 0;
1544 u32 parts, impuselen;
1545
1546 while (++indirections <= UDF_MAX_LVID_NESTING) {
1547 final_bh = NULL;
1548 while (loc.extLength > 0 &&
1549 (bh = udf_read_tagged(sb, loc.extLocation,
1550 loc.extLocation, &ident))) {
1551 if (ident != TAG_IDENT_LVID) {
1552 brelse(bh);
1553 break;
1554 }
1555
1556 brelse(final_bh);
1557 final_bh = bh;
1558
1559 loc.extLength -= sb->s_blocksize;
1560 loc.extLocation++;
1561 }
1562
1563 if (!final_bh)
1564 return;
1565
1566 brelse(sbi->s_lvid_bh);
1567 sbi->s_lvid_bh = final_bh;
1568
1569 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1570 if (lvid->nextIntegrityExt.extLength == 0)
1571 goto check;
1572
1573 loc = leea_to_cpu(lvid->nextIntegrityExt);
1574 }
1575
1576 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1577 UDF_MAX_LVID_NESTING);
1578out_err:
1579 brelse(sbi->s_lvid_bh);
1580 sbi->s_lvid_bh = NULL;
1581 return;
1582check:
1583 parts = le32_to_cpu(lvid->numOfPartitions);
1584 impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1585 if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1586 sizeof(struct logicalVolIntegrityDesc) + impuselen +
1587 2 * parts * sizeof(u32) > sb->s_blocksize) {
1588 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1589 "ignoring.\n", parts, impuselen);
1590 goto out_err;
1591 }
1592}
1593
1594/*
1595 * Step for reallocation of table of partition descriptor sequence numbers.
1596 * Must be power of 2.
1597 */
1598#define PART_DESC_ALLOC_STEP 32
1599
1600struct part_desc_seq_scan_data {
1601 struct udf_vds_record rec;
1602 u32 partnum;
1603};
1604
1605struct desc_seq_scan_data {
1606 struct udf_vds_record vds[VDS_POS_LENGTH];
1607 unsigned int size_part_descs;
1608 unsigned int num_part_descs;
1609 struct part_desc_seq_scan_data *part_descs_loc;
1610};
1611
1612static struct udf_vds_record *handle_partition_descriptor(
1613 struct buffer_head *bh,
1614 struct desc_seq_scan_data *data)
1615{
1616 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1617 int partnum;
1618 int i;
1619
1620 partnum = le16_to_cpu(desc->partitionNumber);
1621 for (i = 0; i < data->num_part_descs; i++)
1622 if (partnum == data->part_descs_loc[i].partnum)
1623 return &(data->part_descs_loc[i].rec);
1624 if (data->num_part_descs >= data->size_part_descs) {
1625 struct part_desc_seq_scan_data *new_loc;
1626 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1627
1628 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL);
1629 if (!new_loc)
1630 return ERR_PTR(-ENOMEM);
1631 memcpy(new_loc, data->part_descs_loc,
1632 data->size_part_descs * sizeof(*new_loc));
1633 kfree(data->part_descs_loc);
1634 data->part_descs_loc = new_loc;
1635 data->size_part_descs = new_size;
1636 }
1637 return &(data->part_descs_loc[data->num_part_descs++].rec);
1638}
1639
1640
1641static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1642 struct buffer_head *bh, struct desc_seq_scan_data *data)
1643{
1644 switch (ident) {
1645 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1646 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1647 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1648 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1649 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1650 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1651 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1652 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1653 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1654 return handle_partition_descriptor(bh, data);
1655 }
1656 return NULL;
1657}
1658
1659/*
1660 * Process a main/reserve volume descriptor sequence.
1661 * @block First block of first extent of the sequence.
1662 * @lastblock Lastblock of first extent of the sequence.
1663 * @fileset There we store extent containing root fileset
1664 *
1665 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1666 * sequence
1667 */
1668static noinline int udf_process_sequence(
1669 struct super_block *sb,
1670 sector_t block, sector_t lastblock,
1671 struct kernel_lb_addr *fileset)
1672{
1673 struct buffer_head *bh = NULL;
1674 struct udf_vds_record *curr;
1675 struct generic_desc *gd;
1676 struct volDescPtr *vdp;
1677 bool done = false;
1678 uint32_t vdsn;
1679 uint16_t ident;
1680 int ret;
1681 unsigned int indirections = 0;
1682 struct desc_seq_scan_data data;
1683 unsigned int i;
1684
1685 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1686 data.size_part_descs = PART_DESC_ALLOC_STEP;
1687 data.num_part_descs = 0;
1688 data.part_descs_loc = kcalloc(data.size_part_descs,
1689 sizeof(*data.part_descs_loc),
1690 GFP_KERNEL);
1691 if (!data.part_descs_loc)
1692 return -ENOMEM;
1693
1694 /*
1695 * Read the main descriptor sequence and find which descriptors
1696 * are in it.
1697 */
1698 for (; (!done && block <= lastblock); block++) {
1699 bh = udf_read_tagged(sb, block, block, &ident);
1700 if (!bh)
1701 break;
1702
1703 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1704 gd = (struct generic_desc *)bh->b_data;
1705 vdsn = le32_to_cpu(gd->volDescSeqNum);
1706 switch (ident) {
1707 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1708 if (++indirections > UDF_MAX_TD_NESTING) {
1709 udf_err(sb, "too many Volume Descriptor "
1710 "Pointers (max %u supported)\n",
1711 UDF_MAX_TD_NESTING);
1712 brelse(bh);
1713 ret = -EIO;
1714 goto out;
1715 }
1716
1717 vdp = (struct volDescPtr *)bh->b_data;
1718 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1719 lastblock = le32_to_cpu(
1720 vdp->nextVolDescSeqExt.extLength) >>
1721 sb->s_blocksize_bits;
1722 lastblock += block - 1;
1723 /* For loop is going to increment 'block' again */
1724 block--;
1725 break;
1726 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1727 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1728 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1729 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1730 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1731 curr = get_volume_descriptor_record(ident, bh, &data);
1732 if (IS_ERR(curr)) {
1733 brelse(bh);
1734 ret = PTR_ERR(curr);
1735 goto out;
1736 }
1737 /* Descriptor we don't care about? */
1738 if (!curr)
1739 break;
1740 if (vdsn >= curr->volDescSeqNum) {
1741 curr->volDescSeqNum = vdsn;
1742 curr->block = block;
1743 }
1744 break;
1745 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1746 done = true;
1747 break;
1748 }
1749 brelse(bh);
1750 }
1751 /*
1752 * Now read interesting descriptors again and process them
1753 * in a suitable order
1754 */
1755 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1756 udf_err(sb, "Primary Volume Descriptor not found!\n");
1757 ret = -EAGAIN;
1758 goto out;
1759 }
1760 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1761 if (ret < 0)
1762 goto out;
1763
1764 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1765 ret = udf_load_logicalvol(sb,
1766 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1767 fileset);
1768 if (ret < 0)
1769 goto out;
1770 }
1771
1772 /* Now handle prevailing Partition Descriptors */
1773 for (i = 0; i < data.num_part_descs; i++) {
1774 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1775 if (ret < 0)
1776 goto out;
1777 }
1778 ret = 0;
1779out:
1780 kfree(data.part_descs_loc);
1781 return ret;
1782}
1783
1784/*
1785 * Load Volume Descriptor Sequence described by anchor in bh
1786 *
1787 * Returns <0 on error, 0 on success
1788 */
1789static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1790 struct kernel_lb_addr *fileset)
1791{
1792 struct anchorVolDescPtr *anchor;
1793 sector_t main_s, main_e, reserve_s, reserve_e;
1794 int ret;
1795
1796 anchor = (struct anchorVolDescPtr *)bh->b_data;
1797
1798 /* Locate the main sequence */
1799 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1800 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1801 main_e = main_e >> sb->s_blocksize_bits;
1802 main_e += main_s - 1;
1803
1804 /* Locate the reserve sequence */
1805 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1806 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1807 reserve_e = reserve_e >> sb->s_blocksize_bits;
1808 reserve_e += reserve_s - 1;
1809
1810 /* Process the main & reserve sequences */
1811 /* responsible for finding the PartitionDesc(s) */
1812 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1813 if (ret != -EAGAIN)
1814 return ret;
1815 udf_sb_free_partitions(sb);
1816 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1817 if (ret < 0) {
1818 udf_sb_free_partitions(sb);
1819 /* No sequence was OK, return -EIO */
1820 if (ret == -EAGAIN)
1821 ret = -EIO;
1822 }
1823 return ret;
1824}
1825
1826/*
1827 * Check whether there is an anchor block in the given block and
1828 * load Volume Descriptor Sequence if so.
1829 *
1830 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1831 * block
1832 */
1833static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1834 struct kernel_lb_addr *fileset)
1835{
1836 struct buffer_head *bh;
1837 uint16_t ident;
1838 int ret;
1839
1840 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1841 udf_fixed_to_variable(block) >=
1842 i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
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] >= i_size_read(sb->s_bdev->bd_inode) >>
1905 sb->s_blocksize_bits)
1906 continue;
1907 ret = udf_check_anchor_block(sb, last[i], fileset);
1908 if (ret != -EAGAIN) {
1909 if (!ret)
1910 *lastblock = last[i];
1911 return ret;
1912 }
1913 if (last[i] < 256)
1914 continue;
1915 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1916 if (ret != -EAGAIN) {
1917 if (!ret)
1918 *lastblock = last[i];
1919 return ret;
1920 }
1921 }
1922
1923 /* Finally try block 512 in case media is open */
1924 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1925}
1926
1927/*
1928 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1929 * area specified by it. The function expects sbi->s_lastblock to be the last
1930 * block on the media.
1931 *
1932 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1933 * was not found.
1934 */
1935static int udf_find_anchor(struct super_block *sb,
1936 struct kernel_lb_addr *fileset)
1937{
1938 struct udf_sb_info *sbi = UDF_SB(sb);
1939 sector_t lastblock = sbi->s_last_block;
1940 int ret;
1941
1942 ret = udf_scan_anchors(sb, &lastblock, fileset);
1943 if (ret != -EAGAIN)
1944 goto out;
1945
1946 /* No anchor found? Try VARCONV conversion of block numbers */
1947 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1948 lastblock = udf_variable_to_fixed(sbi->s_last_block);
1949 /* Firstly, we try to not convert number of the last block */
1950 ret = udf_scan_anchors(sb, &lastblock, fileset);
1951 if (ret != -EAGAIN)
1952 goto out;
1953
1954 lastblock = sbi->s_last_block;
1955 /* Secondly, we try with converted number of the last block */
1956 ret = udf_scan_anchors(sb, &lastblock, fileset);
1957 if (ret < 0) {
1958 /* VARCONV didn't help. Clear it. */
1959 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1960 }
1961out:
1962 if (ret == 0)
1963 sbi->s_last_block = lastblock;
1964 return ret;
1965}
1966
1967/*
1968 * Check Volume Structure Descriptor, find Anchor block and load Volume
1969 * Descriptor Sequence.
1970 *
1971 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1972 * block was not found.
1973 */
1974static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1975 int silent, struct kernel_lb_addr *fileset)
1976{
1977 struct udf_sb_info *sbi = UDF_SB(sb);
1978 int nsr = 0;
1979 int ret;
1980
1981 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1982 if (!silent)
1983 udf_warn(sb, "Bad block size\n");
1984 return -EINVAL;
1985 }
1986 sbi->s_last_block = uopt->lastblock;
1987 if (!uopt->novrs) {
1988 /* Check that it is NSR02 compliant */
1989 nsr = udf_check_vsd(sb);
1990 if (!nsr) {
1991 if (!silent)
1992 udf_warn(sb, "No VRS found\n");
1993 return -EINVAL;
1994 }
1995 if (nsr == -1)
1996 udf_debug("Failed to read sector at offset %d. "
1997 "Assuming open disc. Skipping validity "
1998 "check\n", VSD_FIRST_SECTOR_OFFSET);
1999 if (!sbi->s_last_block)
2000 sbi->s_last_block = udf_get_last_block(sb);
2001 } else {
2002 udf_debug("Validity check skipped because of novrs option\n");
2003 }
2004
2005 /* Look for anchor block and load Volume Descriptor Sequence */
2006 sbi->s_anchor = uopt->anchor;
2007 ret = udf_find_anchor(sb, fileset);
2008 if (ret < 0) {
2009 if (!silent && ret == -EAGAIN)
2010 udf_warn(sb, "No anchor found\n");
2011 return ret;
2012 }
2013 return 0;
2014}
2015
2016static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2017{
2018 struct timespec64 ts;
2019
2020 ktime_get_real_ts64(&ts);
2021 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2022 lvid->descTag.descCRC = cpu_to_le16(
2023 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2024 le16_to_cpu(lvid->descTag.descCRCLength)));
2025 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2026}
2027
2028static void udf_open_lvid(struct super_block *sb)
2029{
2030 struct udf_sb_info *sbi = UDF_SB(sb);
2031 struct buffer_head *bh = sbi->s_lvid_bh;
2032 struct logicalVolIntegrityDesc *lvid;
2033 struct logicalVolIntegrityDescImpUse *lvidiu;
2034
2035 if (!bh)
2036 return;
2037 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2038 lvidiu = udf_sb_lvidiu(sb);
2039 if (!lvidiu)
2040 return;
2041
2042 mutex_lock(&sbi->s_alloc_mutex);
2043 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2044 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2045 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2046 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2047 else
2048 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2049
2050 udf_finalize_lvid(lvid);
2051 mark_buffer_dirty(bh);
2052 sbi->s_lvid_dirty = 0;
2053 mutex_unlock(&sbi->s_alloc_mutex);
2054 /* Make opening of filesystem visible on the media immediately */
2055 sync_dirty_buffer(bh);
2056}
2057
2058static void udf_close_lvid(struct super_block *sb)
2059{
2060 struct udf_sb_info *sbi = UDF_SB(sb);
2061 struct buffer_head *bh = sbi->s_lvid_bh;
2062 struct logicalVolIntegrityDesc *lvid;
2063 struct logicalVolIntegrityDescImpUse *lvidiu;
2064
2065 if (!bh)
2066 return;
2067 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2068 lvidiu = udf_sb_lvidiu(sb);
2069 if (!lvidiu)
2070 return;
2071
2072 mutex_lock(&sbi->s_alloc_mutex);
2073 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2074 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2075 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2076 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2077 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2078 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2079 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2080 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2081 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2082 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2083
2084 /*
2085 * We set buffer uptodate unconditionally here to avoid spurious
2086 * warnings from mark_buffer_dirty() when previous EIO has marked
2087 * the buffer as !uptodate
2088 */
2089 set_buffer_uptodate(bh);
2090 udf_finalize_lvid(lvid);
2091 mark_buffer_dirty(bh);
2092 sbi->s_lvid_dirty = 0;
2093 mutex_unlock(&sbi->s_alloc_mutex);
2094 /* Make closing of filesystem visible on the media immediately */
2095 sync_dirty_buffer(bh);
2096}
2097
2098u64 lvid_get_unique_id(struct super_block *sb)
2099{
2100 struct buffer_head *bh;
2101 struct udf_sb_info *sbi = UDF_SB(sb);
2102 struct logicalVolIntegrityDesc *lvid;
2103 struct logicalVolHeaderDesc *lvhd;
2104 u64 uniqueID;
2105 u64 ret;
2106
2107 bh = sbi->s_lvid_bh;
2108 if (!bh)
2109 return 0;
2110
2111 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2112 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2113
2114 mutex_lock(&sbi->s_alloc_mutex);
2115 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2116 if (!(++uniqueID & 0xFFFFFFFF))
2117 uniqueID += 16;
2118 lvhd->uniqueID = cpu_to_le64(uniqueID);
2119 udf_updated_lvid(sb);
2120 mutex_unlock(&sbi->s_alloc_mutex);
2121
2122 return ret;
2123}
2124
2125static int udf_fill_super(struct super_block *sb, void *options, int silent)
2126{
2127 int ret = -EINVAL;
2128 struct inode *inode = NULL;
2129 struct udf_options uopt;
2130 struct kernel_lb_addr rootdir, fileset;
2131 struct udf_sb_info *sbi;
2132 bool lvid_open = false;
2133
2134 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2135 /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2136 uopt.uid = make_kuid(current_user_ns(), overflowuid);
2137 uopt.gid = make_kgid(current_user_ns(), overflowgid);
2138 uopt.umask = 0;
2139 uopt.fmode = UDF_INVALID_MODE;
2140 uopt.dmode = UDF_INVALID_MODE;
2141 uopt.nls_map = NULL;
2142
2143 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2144 if (!sbi)
2145 return -ENOMEM;
2146
2147 sb->s_fs_info = sbi;
2148
2149 mutex_init(&sbi->s_alloc_mutex);
2150
2151 if (!udf_parse_options((char *)options, &uopt, false))
2152 goto parse_options_failure;
2153
2154 fileset.logicalBlockNum = 0xFFFFFFFF;
2155 fileset.partitionReferenceNum = 0xFFFF;
2156
2157 sbi->s_flags = uopt.flags;
2158 sbi->s_uid = uopt.uid;
2159 sbi->s_gid = uopt.gid;
2160 sbi->s_umask = uopt.umask;
2161 sbi->s_fmode = uopt.fmode;
2162 sbi->s_dmode = uopt.dmode;
2163 sbi->s_nls_map = uopt.nls_map;
2164 rwlock_init(&sbi->s_cred_lock);
2165
2166 if (uopt.session == 0xFFFFFFFF)
2167 sbi->s_session = udf_get_last_session(sb);
2168 else
2169 sbi->s_session = uopt.session;
2170
2171 udf_debug("Multi-session=%d\n", sbi->s_session);
2172
2173 /* Fill in the rest of the superblock */
2174 sb->s_op = &udf_sb_ops;
2175 sb->s_export_op = &udf_export_ops;
2176
2177 sb->s_magic = UDF_SUPER_MAGIC;
2178 sb->s_time_gran = 1000;
2179
2180 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2181 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2182 } else {
2183 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2184 while (uopt.blocksize <= 4096) {
2185 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2186 if (ret < 0) {
2187 if (!silent && ret != -EACCES) {
2188 pr_notice("Scanning with blocksize %u failed\n",
2189 uopt.blocksize);
2190 }
2191 brelse(sbi->s_lvid_bh);
2192 sbi->s_lvid_bh = NULL;
2193 /*
2194 * EACCES is special - we want to propagate to
2195 * upper layers that we cannot handle RW mount.
2196 */
2197 if (ret == -EACCES)
2198 break;
2199 } else
2200 break;
2201
2202 uopt.blocksize <<= 1;
2203 }
2204 }
2205 if (ret < 0) {
2206 if (ret == -EAGAIN) {
2207 udf_warn(sb, "No partition found (1)\n");
2208 ret = -EINVAL;
2209 }
2210 goto error_out;
2211 }
2212
2213 udf_debug("Lastblock=%u\n", sbi->s_last_block);
2214
2215 if (sbi->s_lvid_bh) {
2216 struct logicalVolIntegrityDescImpUse *lvidiu =
2217 udf_sb_lvidiu(sb);
2218 uint16_t minUDFReadRev;
2219 uint16_t minUDFWriteRev;
2220
2221 if (!lvidiu) {
2222 ret = -EINVAL;
2223 goto error_out;
2224 }
2225 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2226 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2227 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2228 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2229 minUDFReadRev,
2230 UDF_MAX_READ_VERSION);
2231 ret = -EINVAL;
2232 goto error_out;
2233 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2234 if (!sb_rdonly(sb)) {
2235 ret = -EACCES;
2236 goto error_out;
2237 }
2238 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2239 }
2240
2241 sbi->s_udfrev = minUDFWriteRev;
2242
2243 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2244 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2245 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2246 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2247 }
2248
2249 if (!sbi->s_partitions) {
2250 udf_warn(sb, "No partition found (2)\n");
2251 ret = -EINVAL;
2252 goto error_out;
2253 }
2254
2255 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2256 UDF_PART_FLAG_READ_ONLY) {
2257 if (!sb_rdonly(sb)) {
2258 ret = -EACCES;
2259 goto error_out;
2260 }
2261 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2262 }
2263
2264 ret = udf_find_fileset(sb, &fileset, &rootdir);
2265 if (ret < 0) {
2266 udf_warn(sb, "No fileset found\n");
2267 goto error_out;
2268 }
2269
2270 if (!silent) {
2271 struct timestamp ts;
2272 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2273 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2274 sbi->s_volume_ident,
2275 le16_to_cpu(ts.year), ts.month, ts.day,
2276 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2277 }
2278 if (!sb_rdonly(sb)) {
2279 udf_open_lvid(sb);
2280 lvid_open = true;
2281 }
2282
2283 /* Assign the root inode */
2284 /* assign inodes by physical block number */
2285 /* perhaps it's not extensible enough, but for now ... */
2286 inode = udf_iget(sb, &rootdir);
2287 if (IS_ERR(inode)) {
2288 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2289 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2290 ret = PTR_ERR(inode);
2291 goto error_out;
2292 }
2293
2294 /* Allocate a dentry for the root inode */
2295 sb->s_root = d_make_root(inode);
2296 if (!sb->s_root) {
2297 udf_err(sb, "Couldn't allocate root dentry\n");
2298 ret = -ENOMEM;
2299 goto error_out;
2300 }
2301 sb->s_maxbytes = MAX_LFS_FILESIZE;
2302 sb->s_max_links = UDF_MAX_LINKS;
2303 return 0;
2304
2305error_out:
2306 iput(sbi->s_vat_inode);
2307parse_options_failure:
2308 unload_nls(uopt.nls_map);
2309 if (lvid_open)
2310 udf_close_lvid(sb);
2311 brelse(sbi->s_lvid_bh);
2312 udf_sb_free_partitions(sb);
2313 kfree(sbi);
2314 sb->s_fs_info = NULL;
2315
2316 return ret;
2317}
2318
2319void _udf_err(struct super_block *sb, const char *function,
2320 const char *fmt, ...)
2321{
2322 struct va_format vaf;
2323 va_list args;
2324
2325 va_start(args, fmt);
2326
2327 vaf.fmt = fmt;
2328 vaf.va = &args;
2329
2330 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2331
2332 va_end(args);
2333}
2334
2335void _udf_warn(struct super_block *sb, const char *function,
2336 const char *fmt, ...)
2337{
2338 struct va_format vaf;
2339 va_list args;
2340
2341 va_start(args, fmt);
2342
2343 vaf.fmt = fmt;
2344 vaf.va = &args;
2345
2346 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2347
2348 va_end(args);
2349}
2350
2351static void udf_put_super(struct super_block *sb)
2352{
2353 struct udf_sb_info *sbi;
2354
2355 sbi = UDF_SB(sb);
2356
2357 iput(sbi->s_vat_inode);
2358 unload_nls(sbi->s_nls_map);
2359 if (!sb_rdonly(sb))
2360 udf_close_lvid(sb);
2361 brelse(sbi->s_lvid_bh);
2362 udf_sb_free_partitions(sb);
2363 mutex_destroy(&sbi->s_alloc_mutex);
2364 kfree(sb->s_fs_info);
2365 sb->s_fs_info = NULL;
2366}
2367
2368static int udf_sync_fs(struct super_block *sb, int wait)
2369{
2370 struct udf_sb_info *sbi = UDF_SB(sb);
2371
2372 mutex_lock(&sbi->s_alloc_mutex);
2373 if (sbi->s_lvid_dirty) {
2374 struct buffer_head *bh = sbi->s_lvid_bh;
2375 struct logicalVolIntegrityDesc *lvid;
2376
2377 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2378 udf_finalize_lvid(lvid);
2379
2380 /*
2381 * Blockdevice will be synced later so we don't have to submit
2382 * the buffer for IO
2383 */
2384 mark_buffer_dirty(bh);
2385 sbi->s_lvid_dirty = 0;
2386 }
2387 mutex_unlock(&sbi->s_alloc_mutex);
2388
2389 return 0;
2390}
2391
2392static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2393{
2394 struct super_block *sb = dentry->d_sb;
2395 struct udf_sb_info *sbi = UDF_SB(sb);
2396 struct logicalVolIntegrityDescImpUse *lvidiu;
2397 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2398
2399 lvidiu = udf_sb_lvidiu(sb);
2400 buf->f_type = UDF_SUPER_MAGIC;
2401 buf->f_bsize = sb->s_blocksize;
2402 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2403 buf->f_bfree = udf_count_free(sb);
2404 buf->f_bavail = buf->f_bfree;
2405 /*
2406 * Let's pretend each free block is also a free 'inode' since UDF does
2407 * not have separate preallocated table of inodes.
2408 */
2409 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2410 le32_to_cpu(lvidiu->numDirs)) : 0)
2411 + buf->f_bfree;
2412 buf->f_ffree = buf->f_bfree;
2413 buf->f_namelen = UDF_NAME_LEN;
2414 buf->f_fsid = u64_to_fsid(id);
2415
2416 return 0;
2417}
2418
2419static unsigned int udf_count_free_bitmap(struct super_block *sb,
2420 struct udf_bitmap *bitmap)
2421{
2422 struct buffer_head *bh = NULL;
2423 unsigned int accum = 0;
2424 int index;
2425 udf_pblk_t block = 0, newblock;
2426 struct kernel_lb_addr loc;
2427 uint32_t bytes;
2428 uint8_t *ptr;
2429 uint16_t ident;
2430 struct spaceBitmapDesc *bm;
2431
2432 loc.logicalBlockNum = bitmap->s_extPosition;
2433 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2434 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2435
2436 if (!bh) {
2437 udf_err(sb, "udf_count_free failed\n");
2438 goto out;
2439 } else if (ident != TAG_IDENT_SBD) {
2440 brelse(bh);
2441 udf_err(sb, "udf_count_free failed\n");
2442 goto out;
2443 }
2444
2445 bm = (struct spaceBitmapDesc *)bh->b_data;
2446 bytes = le32_to_cpu(bm->numOfBytes);
2447 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2448 ptr = (uint8_t *)bh->b_data;
2449
2450 while (bytes > 0) {
2451 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2452 accum += bitmap_weight((const unsigned long *)(ptr + index),
2453 cur_bytes * 8);
2454 bytes -= cur_bytes;
2455 if (bytes) {
2456 brelse(bh);
2457 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2458 bh = udf_tread(sb, newblock);
2459 if (!bh) {
2460 udf_debug("read failed\n");
2461 goto out;
2462 }
2463 index = 0;
2464 ptr = (uint8_t *)bh->b_data;
2465 }
2466 }
2467 brelse(bh);
2468out:
2469 return accum;
2470}
2471
2472static unsigned int udf_count_free_table(struct super_block *sb,
2473 struct inode *table)
2474{
2475 unsigned int accum = 0;
2476 uint32_t elen;
2477 struct kernel_lb_addr eloc;
2478 int8_t etype;
2479 struct extent_position epos;
2480
2481 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2482 epos.block = UDF_I(table)->i_location;
2483 epos.offset = sizeof(struct unallocSpaceEntry);
2484 epos.bh = NULL;
2485
2486 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2487 accum += (elen >> table->i_sb->s_blocksize_bits);
2488
2489 brelse(epos.bh);
2490 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2491
2492 return accum;
2493}
2494
2495static unsigned int udf_count_free(struct super_block *sb)
2496{
2497 unsigned int accum = 0;
2498 struct udf_sb_info *sbi = UDF_SB(sb);
2499 struct udf_part_map *map;
2500 unsigned int part = sbi->s_partition;
2501 int ptype = sbi->s_partmaps[part].s_partition_type;
2502
2503 if (ptype == UDF_METADATA_MAP25) {
2504 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2505 s_phys_partition_ref;
2506 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2507 /*
2508 * Filesystems with VAT are append-only and we cannot write to
2509 * them. Let's just report 0 here.
2510 */
2511 return 0;
2512 }
2513
2514 if (sbi->s_lvid_bh) {
2515 struct logicalVolIntegrityDesc *lvid =
2516 (struct logicalVolIntegrityDesc *)
2517 sbi->s_lvid_bh->b_data;
2518 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2519 accum = le32_to_cpu(
2520 lvid->freeSpaceTable[part]);
2521 if (accum == 0xFFFFFFFF)
2522 accum = 0;
2523 }
2524 }
2525
2526 if (accum)
2527 return accum;
2528
2529 map = &sbi->s_partmaps[part];
2530 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2531 accum += udf_count_free_bitmap(sb,
2532 map->s_uspace.s_bitmap);
2533 }
2534 if (accum)
2535 return accum;
2536
2537 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2538 accum += udf_count_free_table(sb,
2539 map->s_uspace.s_table);
2540 }
2541 return accum;
2542}
2543
2544MODULE_AUTHOR("Ben Fennema");
2545MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2546MODULE_LICENSE("GPL");
2547module_init(init_udf_fs)
2548module_exit(exit_udf_fs)