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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 mmb_init(&ei->i_metadata_bhs, &ei->vfs_inode.i_data);
170
171 return &ei->vfs_inode;
172}
173
174static void udf_free_in_core_inode(struct inode *inode)
175{
176 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
177}
178
179static void init_once(void *foo)
180{
181 struct udf_inode_info *ei = foo;
182
183 ei->i_data = NULL;
184 inode_init_once(&ei->vfs_inode);
185}
186
187static int __init init_inodecache(void)
188{
189 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
190 sizeof(struct udf_inode_info),
191 0, (SLAB_RECLAIM_ACCOUNT |
192 SLAB_ACCOUNT),
193 init_once);
194 if (!udf_inode_cachep)
195 return -ENOMEM;
196 return 0;
197}
198
199static void destroy_inodecache(void)
200{
201 /*
202 * Make sure all delayed rcu free inodes are flushed before we
203 * destroy cache.
204 */
205 rcu_barrier();
206 kmem_cache_destroy(udf_inode_cachep);
207}
208
209/* Superblock operations */
210static const struct super_operations udf_sb_ops = {
211 .alloc_inode = udf_alloc_inode,
212 .free_inode = udf_free_in_core_inode,
213 .write_inode = udf_write_inode,
214 .sync_inode_metadata = udf_sync_inode_metadata,
215 .evict_inode = udf_evict_inode,
216 .put_super = udf_put_super,
217 .sync_fs = udf_sync_fs,
218 .statfs = udf_statfs,
219 .show_options = udf_show_options,
220};
221
222struct udf_options {
223 unsigned int blocksize;
224 unsigned int session;
225 unsigned int lastblock;
226 unsigned int anchor;
227 unsigned int flags;
228 umode_t umask;
229 kgid_t gid;
230 kuid_t uid;
231 umode_t fmode;
232 umode_t dmode;
233 struct nls_table *nls_map;
234};
235
236/*
237 * UDF has historically preserved prior mount options across
238 * a remount, so copy those here if remounting, otherwise set
239 * initial mount defaults.
240 */
241static void udf_init_options(struct fs_context *fc, struct udf_options *uopt)
242{
243 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
244 struct super_block *sb = fc->root->d_sb;
245 struct udf_sb_info *sbi = UDF_SB(sb);
246
247 uopt->flags = sbi->s_flags;
248 uopt->uid = sbi->s_uid;
249 uopt->gid = sbi->s_gid;
250 uopt->umask = sbi->s_umask;
251 uopt->fmode = sbi->s_fmode;
252 uopt->dmode = sbi->s_dmode;
253 uopt->nls_map = NULL;
254 } else {
255 uopt->flags = (1 << UDF_FLAG_USE_AD_IN_ICB) |
256 (1 << UDF_FLAG_STRICT);
257 /*
258 * By default we'll use overflow[ug]id when UDF
259 * inode [ug]id == -1
260 */
261 uopt->uid = make_kuid(current_user_ns(), overflowuid);
262 uopt->gid = make_kgid(current_user_ns(), overflowgid);
263 uopt->umask = 0;
264 uopt->fmode = UDF_INVALID_MODE;
265 uopt->dmode = UDF_INVALID_MODE;
266 uopt->nls_map = NULL;
267 uopt->session = 0xFFFFFFFF;
268 }
269}
270
271static int udf_init_fs_context(struct fs_context *fc)
272{
273 struct udf_options *uopt;
274
275 uopt = kzalloc_obj(*uopt);
276 if (!uopt)
277 return -ENOMEM;
278
279 udf_init_options(fc, uopt);
280
281 fc->fs_private = uopt;
282 fc->ops = &udf_context_ops;
283
284 return 0;
285}
286
287static void udf_free_fc(struct fs_context *fc)
288{
289 struct udf_options *uopt = fc->fs_private;
290
291 unload_nls(uopt->nls_map);
292 kfree(fc->fs_private);
293}
294
295static int __init init_udf_fs(void)
296{
297 int err;
298
299 err = init_inodecache();
300 if (err)
301 goto out1;
302 err = register_filesystem(&udf_fstype);
303 if (err)
304 goto out;
305
306 return 0;
307
308out:
309 destroy_inodecache();
310
311out1:
312 return err;
313}
314
315static void __exit exit_udf_fs(void)
316{
317 unregister_filesystem(&udf_fstype);
318 destroy_inodecache();
319}
320
321static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
322{
323 struct udf_sb_info *sbi = UDF_SB(sb);
324
325 sbi->s_partmaps = kzalloc_objs(*sbi->s_partmaps, count);
326 if (!sbi->s_partmaps) {
327 sbi->s_partitions = 0;
328 return -ENOMEM;
329 }
330
331 sbi->s_partitions = count;
332 return 0;
333}
334
335static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
336{
337 int i;
338 int nr_groups = bitmap->s_nr_groups;
339
340 for (i = 0; i < nr_groups; i++)
341 if (!IS_ERR_OR_NULL(bitmap->s_block_bitmap[i]))
342 brelse(bitmap->s_block_bitmap[i]);
343
344 kvfree(bitmap);
345}
346
347static void udf_free_partition(struct udf_part_map *map)
348{
349 int i;
350 struct udf_meta_data *mdata;
351
352 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
353 iput(map->s_uspace.s_table);
354 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
355 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
356 if (map->s_partition_type == UDF_SPARABLE_MAP15)
357 for (i = 0; i < 4; i++)
358 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
359 else if (map->s_partition_type == UDF_METADATA_MAP25) {
360 mdata = &map->s_type_specific.s_metadata;
361 iput(mdata->s_metadata_fe);
362 mdata->s_metadata_fe = NULL;
363
364 iput(mdata->s_mirror_fe);
365 mdata->s_mirror_fe = NULL;
366
367 iput(mdata->s_bitmap_fe);
368 mdata->s_bitmap_fe = NULL;
369 }
370}
371
372static void udf_sb_free_partitions(struct super_block *sb)
373{
374 struct udf_sb_info *sbi = UDF_SB(sb);
375 int i;
376
377 if (!sbi->s_partmaps)
378 return;
379 for (i = 0; i < sbi->s_partitions; i++)
380 udf_free_partition(&sbi->s_partmaps[i]);
381 kfree(sbi->s_partmaps);
382 sbi->s_partmaps = NULL;
383}
384
385static int udf_show_options(struct seq_file *seq, struct dentry *root)
386{
387 struct super_block *sb = root->d_sb;
388 struct udf_sb_info *sbi = UDF_SB(sb);
389
390 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
391 seq_puts(seq, ",nostrict");
392 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
393 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
394 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
395 seq_puts(seq, ",unhide");
396 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
397 seq_puts(seq, ",undelete");
398 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
399 seq_puts(seq, ",noadinicb");
400 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
401 seq_puts(seq, ",shortad");
402 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
403 seq_puts(seq, ",uid=forget");
404 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
405 seq_puts(seq, ",gid=forget");
406 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
407 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
408 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
409 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
410 if (sbi->s_umask != 0)
411 seq_printf(seq, ",umask=%ho", sbi->s_umask);
412 if (sbi->s_fmode != UDF_INVALID_MODE)
413 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
414 if (sbi->s_dmode != UDF_INVALID_MODE)
415 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
416 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
417 seq_printf(seq, ",session=%d", sbi->s_session);
418 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
419 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
420 if (sbi->s_anchor != 0)
421 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
422 if (sbi->s_nls_map)
423 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
424 else
425 seq_puts(seq, ",iocharset=utf8");
426
427 return 0;
428}
429
430/*
431 * udf_parse_param
432 *
433 * PURPOSE
434 * Parse mount options.
435 *
436 * DESCRIPTION
437 * The following mount options are supported:
438 *
439 * gid= Set the default group.
440 * umask= Set the default umask.
441 * mode= Set the default file permissions.
442 * dmode= Set the default directory permissions.
443 * uid= Set the default user.
444 * bs= Set the block size.
445 * unhide Show otherwise hidden files.
446 * undelete Show deleted files in lists.
447 * adinicb Embed data in the inode (default)
448 * noadinicb Don't embed data in the inode
449 * shortad Use short ad's
450 * longad Use long ad's (default)
451 * nostrict Unset strict conformance
452 * iocharset= Set the NLS character set
453 *
454 * The remaining are for debugging and disaster recovery:
455 *
456 * novrs Skip volume sequence recognition
457 *
458 * The following expect a offset from 0.
459 *
460 * session= Set the CDROM session (default= last session)
461 * anchor= Override standard anchor location. (default= 256)
462 * volume= Override the VolumeDesc location. (unused)
463 * partition= Override the PartitionDesc location. (unused)
464 * lastblock= Set the last block of the filesystem/
465 *
466 * The following expect a offset from the partition root.
467 *
468 * fileset= Override the fileset block location. (unused)
469 * rootdir= Override the root directory location. (unused)
470 * WARNING: overriding the rootdir to a non-directory may
471 * yield highly unpredictable results.
472 *
473 * PRE-CONDITIONS
474 * fc fs_context with pointer to mount options variable.
475 * param Pointer to fs_parameter being parsed.
476 *
477 * POST-CONDITIONS
478 * <return> 0 Mount options parsed okay.
479 * <return> errno Error parsing mount options.
480 *
481 * HISTORY
482 * July 1, 1997 - Andrew E. Mileski
483 * Written, tested, and released.
484 */
485
486enum {
487 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
488 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
489 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
490 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
491 Opt_rootdir, Opt_utf8, Opt_iocharset, Opt_err, Opt_fmode, Opt_dmode
492};
493
494static const struct fs_parameter_spec udf_param_spec[] = {
495 fsparam_flag ("novrs", Opt_novrs),
496 fsparam_flag ("nostrict", Opt_nostrict),
497 fsparam_u32 ("bs", Opt_bs),
498 fsparam_flag ("unhide", Opt_unhide),
499 fsparam_flag ("undelete", Opt_undelete),
500 fsparam_flag_no ("adinicb", Opt_adinicb),
501 fsparam_flag ("shortad", Opt_shortad),
502 fsparam_flag ("longad", Opt_longad),
503 fsparam_string ("gid", Opt_gid),
504 fsparam_string ("uid", Opt_uid),
505 fsparam_u32 ("umask", Opt_umask),
506 fsparam_u32 ("session", Opt_session),
507 fsparam_u32 ("lastblock", Opt_lastblock),
508 fsparam_u32 ("anchor", Opt_anchor),
509 fsparam_u32 ("volume", Opt_volume),
510 fsparam_u32 ("partition", Opt_partition),
511 fsparam_u32 ("fileset", Opt_fileset),
512 fsparam_u32 ("rootdir", Opt_rootdir),
513 fsparam_flag ("utf8", Opt_utf8),
514 fsparam_string ("iocharset", Opt_iocharset),
515 fsparam_u32 ("mode", Opt_fmode),
516 fsparam_u32 ("dmode", Opt_dmode),
517 {}
518 };
519
520static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param)
521{
522 unsigned int uv;
523 unsigned int n;
524 struct udf_options *uopt = fc->fs_private;
525 struct fs_parse_result result;
526 int token;
527 bool remount = (fc->purpose & FS_CONTEXT_FOR_RECONFIGURE);
528
529 token = fs_parse(fc, udf_param_spec, param, &result);
530 if (token < 0)
531 return token;
532
533 switch (token) {
534 case Opt_novrs:
535 uopt->flags |= (1 << UDF_FLAG_NOVRS);
536 break;
537 case Opt_bs:
538 n = result.uint_32;
539 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
540 return -EINVAL;
541 uopt->blocksize = n;
542 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
543 break;
544 case Opt_unhide:
545 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
546 break;
547 case Opt_undelete:
548 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
549 break;
550 case Opt_adinicb:
551 if (result.negated)
552 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
553 else
554 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
555 break;
556 case Opt_shortad:
557 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
558 break;
559 case Opt_longad:
560 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
561 break;
562 case Opt_gid:
563 if (kstrtoint(param->string, 10, &uv) == 0) {
564 kgid_t gid = make_kgid(current_user_ns(), uv);
565 if (!gid_valid(gid))
566 return -EINVAL;
567 uopt->gid = gid;
568 uopt->flags |= (1 << UDF_FLAG_GID_SET);
569 } else if (!strcmp(param->string, "forget")) {
570 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
571 } else if (!strcmp(param->string, "ignore")) {
572 /* this option is superseded by gid=<number> */
573 ;
574 } else {
575 return -EINVAL;
576 }
577 break;
578 case Opt_uid:
579 if (kstrtoint(param->string, 10, &uv) == 0) {
580 kuid_t uid = make_kuid(current_user_ns(), uv);
581 if (!uid_valid(uid))
582 return -EINVAL;
583 uopt->uid = uid;
584 uopt->flags |= (1 << UDF_FLAG_UID_SET);
585 } else if (!strcmp(param->string, "forget")) {
586 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
587 } else if (!strcmp(param->string, "ignore")) {
588 /* this option is superseded by uid=<number> */
589 ;
590 } else {
591 return -EINVAL;
592 }
593 break;
594 case Opt_umask:
595 uopt->umask = result.uint_32;
596 break;
597 case Opt_nostrict:
598 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
599 break;
600 case Opt_session:
601 uopt->session = result.uint_32;
602 if (!remount)
603 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
604 break;
605 case Opt_lastblock:
606 uopt->lastblock = result.uint_32;
607 if (!remount)
608 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
609 break;
610 case Opt_anchor:
611 uopt->anchor = result.uint_32;
612 break;
613 case Opt_volume:
614 case Opt_partition:
615 case Opt_fileset:
616 case Opt_rootdir:
617 /* Ignored (never implemented properly) */
618 break;
619 case Opt_utf8:
620 if (!remount) {
621 unload_nls(uopt->nls_map);
622 uopt->nls_map = NULL;
623 }
624 break;
625 case Opt_iocharset:
626 if (!remount) {
627 unload_nls(uopt->nls_map);
628 uopt->nls_map = NULL;
629 }
630 /* When nls_map is not loaded then UTF-8 is used */
631 if (!remount && strcmp(param->string, "utf8") != 0) {
632 uopt->nls_map = load_nls(param->string);
633 if (!uopt->nls_map) {
634 errorf(fc, "iocharset %s not found",
635 param->string);
636 return -EINVAL;
637 }
638 }
639 break;
640 case Opt_fmode:
641 uopt->fmode = result.uint_32 & 0777;
642 break;
643 case Opt_dmode:
644 uopt->dmode = result.uint_32 & 0777;
645 break;
646 default:
647 return -EINVAL;
648 }
649 return 0;
650}
651
652static int udf_reconfigure(struct fs_context *fc)
653{
654 struct udf_options *uopt = fc->fs_private;
655 struct super_block *sb = fc->root->d_sb;
656 struct udf_sb_info *sbi = UDF_SB(sb);
657 int readonly = fc->sb_flags & SB_RDONLY;
658 int error = 0;
659
660 if (!readonly && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
661 return -EACCES;
662
663 sync_filesystem(sb);
664
665 write_lock(&sbi->s_cred_lock);
666 sbi->s_flags = uopt->flags;
667 sbi->s_uid = uopt->uid;
668 sbi->s_gid = uopt->gid;
669 sbi->s_umask = uopt->umask;
670 sbi->s_fmode = uopt->fmode;
671 sbi->s_dmode = uopt->dmode;
672 write_unlock(&sbi->s_cred_lock);
673
674 if (readonly == sb_rdonly(sb))
675 goto out_unlock;
676
677 if (readonly)
678 udf_close_lvid(sb);
679 else
680 udf_open_lvid(sb);
681
682out_unlock:
683 return error;
684}
685
686/*
687 * Check VSD descriptor. Returns -1 in case we are at the end of volume
688 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if
689 * we found one of NSR descriptors we are looking for.
690 */
691static int identify_vsd(const struct volStructDesc *vsd)
692{
693 int ret = 0;
694
695 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
696 switch (vsd->structType) {
697 case 0:
698 udf_debug("ISO9660 Boot Record found\n");
699 break;
700 case 1:
701 udf_debug("ISO9660 Primary Volume Descriptor found\n");
702 break;
703 case 2:
704 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
705 break;
706 case 3:
707 udf_debug("ISO9660 Volume Partition Descriptor found\n");
708 break;
709 case 255:
710 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
711 break;
712 default:
713 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
714 break;
715 }
716 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
717 ; /* ret = 0 */
718 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
719 ret = 1;
720 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
721 ret = 1;
722 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
723 ; /* ret = 0 */
724 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
725 ; /* ret = 0 */
726 else {
727 /* TEA01 or invalid id : end of volume recognition area */
728 ret = -1;
729 }
730
731 return ret;
732}
733
734/*
735 * Check Volume Structure Descriptors (ECMA 167 2/9.1)
736 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
737 * @return 1 if NSR02 or NSR03 found,
738 * -1 if first sector read error, 0 otherwise
739 */
740static int udf_check_vsd(struct super_block *sb)
741{
742 struct volStructDesc *vsd = NULL;
743 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
744 int sectorsize;
745 struct buffer_head *bh = NULL;
746 int nsr = 0;
747 struct udf_sb_info *sbi;
748 loff_t session_offset;
749
750 sbi = UDF_SB(sb);
751 if (sb->s_blocksize < sizeof(struct volStructDesc))
752 sectorsize = sizeof(struct volStructDesc);
753 else
754 sectorsize = sb->s_blocksize;
755
756 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
757 sector += session_offset;
758
759 udf_debug("Starting at sector %u (%lu byte sectors)\n",
760 (unsigned int)(sector >> sb->s_blocksize_bits),
761 sb->s_blocksize);
762 /* Process the sequence (if applicable). The hard limit on the sector
763 * offset is arbitrary, hopefully large enough so that all valid UDF
764 * filesystems will be recognised. There is no mention of an upper
765 * bound to the size of the volume recognition area in the standard.
766 * The limit will prevent the code to read all the sectors of a
767 * specially crafted image (like a bluray disc full of CD001 sectors),
768 * potentially causing minutes or even hours of uninterruptible I/O
769 * activity. This actually happened with uninitialised SSD partitions
770 * (all 0xFF) before the check for the limit and all valid IDs were
771 * added */
772 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
773 /* Read a block */
774 bh = sb_bread(sb, sector >> sb->s_blocksize_bits);
775 if (!bh)
776 break;
777
778 vsd = (struct volStructDesc *)(bh->b_data +
779 (sector & (sb->s_blocksize - 1)));
780 nsr = identify_vsd(vsd);
781 /* Found NSR or end? */
782 if (nsr) {
783 brelse(bh);
784 break;
785 }
786 /*
787 * Special handling for improperly formatted VRS (e.g., Win10)
788 * where components are separated by 2048 bytes even though
789 * sectors are 4K
790 */
791 if (sb->s_blocksize == 4096) {
792 nsr = identify_vsd(vsd + 1);
793 /* Ignore unknown IDs... */
794 if (nsr < 0)
795 nsr = 0;
796 }
797 brelse(bh);
798 }
799
800 if (nsr > 0)
801 return 1;
802 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
803 return -1;
804 else
805 return 0;
806}
807
808static int udf_verify_domain_identifier(struct super_block *sb,
809 struct regid *ident, char *dname)
810{
811 struct domainIdentSuffix *suffix;
812
813 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
814 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
815 goto force_ro;
816 }
817 if (ident->flags & ENTITYID_FLAGS_DIRTY) {
818 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
819 dname);
820 goto force_ro;
821 }
822 suffix = (struct domainIdentSuffix *)ident->identSuffix;
823 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
824 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
825 if (!sb_rdonly(sb)) {
826 udf_warn(sb, "Descriptor for %s marked write protected."
827 " Forcing read only mount.\n", dname);
828 }
829 goto force_ro;
830 }
831 return 0;
832
833force_ro:
834 if (!sb_rdonly(sb))
835 return -EACCES;
836 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
837 return 0;
838}
839
840static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
841 struct kernel_lb_addr *root)
842{
843 int ret;
844
845 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
846 if (ret < 0)
847 return ret;
848
849 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
850 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
851
852 udf_debug("Rootdir at block=%u, partition=%u\n",
853 root->logicalBlockNum, root->partitionReferenceNum);
854 return 0;
855}
856
857static int udf_find_fileset(struct super_block *sb,
858 struct kernel_lb_addr *fileset,
859 struct kernel_lb_addr *root)
860{
861 struct buffer_head *bh;
862 uint16_t ident;
863 int ret;
864
865 if (fileset->logicalBlockNum == 0xFFFFFFFF &&
866 fileset->partitionReferenceNum == 0xFFFF)
867 return -EINVAL;
868
869 bh = udf_read_ptagged(sb, fileset, 0, &ident);
870 if (!bh)
871 return -EIO;
872 if (ident != TAG_IDENT_FSD) {
873 brelse(bh);
874 return -EINVAL;
875 }
876
877 udf_debug("Fileset at block=%u, partition=%u\n",
878 fileset->logicalBlockNum, fileset->partitionReferenceNum);
879
880 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
881 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
882 brelse(bh);
883 return ret;
884}
885
886/*
887 * Load primary Volume Descriptor Sequence
888 *
889 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
890 * should be tried.
891 */
892static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
893{
894 struct primaryVolDesc *pvoldesc;
895 uint8_t *outstr;
896 struct buffer_head *bh;
897 uint16_t ident;
898 int ret;
899 struct timestamp *ts;
900
901 outstr = kzalloc(128, GFP_KERNEL);
902 if (!outstr)
903 return -ENOMEM;
904
905 bh = udf_read_tagged(sb, block, block, &ident);
906 if (!bh) {
907 ret = -EAGAIN;
908 goto out2;
909 }
910
911 if (ident != TAG_IDENT_PVD) {
912 ret = -EIO;
913 goto out_bh;
914 }
915
916 pvoldesc = (struct primaryVolDesc *)bh->b_data;
917
918 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
919 pvoldesc->recordingDateAndTime);
920 ts = &pvoldesc->recordingDateAndTime;
921 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
922 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
923 ts->minute, le16_to_cpu(ts->typeAndTimezone));
924
925 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
926 if (ret < 0) {
927 strscpy_pad(UDF_SB(sb)->s_volume_ident, "InvalidName");
928 pr_warn("incorrect volume identification, setting to "
929 "'InvalidName'\n");
930 } else {
931 strscpy_pad(UDF_SB(sb)->s_volume_ident, outstr);
932 }
933 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
934
935 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
936 if (ret < 0) {
937 ret = 0;
938 goto out_bh;
939 }
940 outstr[ret] = 0;
941 udf_debug("volSetIdent[] = '%s'\n", outstr);
942
943 ret = 0;
944out_bh:
945 brelse(bh);
946out2:
947 kfree(outstr);
948 return ret;
949}
950
951struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
952 u32 meta_file_loc, u32 partition_ref)
953{
954 struct kernel_lb_addr addr;
955 struct inode *metadata_fe;
956
957 addr.logicalBlockNum = meta_file_loc;
958 addr.partitionReferenceNum = partition_ref;
959
960 metadata_fe = udf_iget_special(sb, &addr);
961
962 if (IS_ERR(metadata_fe)) {
963 udf_warn(sb, "metadata inode efe not found\n");
964 return metadata_fe;
965 }
966 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
967 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
968 iput(metadata_fe);
969 return ERR_PTR(-EIO);
970 }
971
972 return metadata_fe;
973}
974
975static int udf_load_metadata_files(struct super_block *sb, int partition,
976 int type1_index)
977{
978 struct udf_sb_info *sbi = UDF_SB(sb);
979 struct udf_part_map *map;
980 struct udf_meta_data *mdata;
981 struct kernel_lb_addr addr;
982 struct inode *fe;
983
984 map = &sbi->s_partmaps[partition];
985 mdata = &map->s_type_specific.s_metadata;
986 mdata->s_phys_partition_ref = type1_index;
987
988 /* metadata address */
989 udf_debug("Metadata file location: block = %u part = %u\n",
990 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
991
992 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
993 mdata->s_phys_partition_ref);
994 if (IS_ERR(fe)) {
995 /* mirror file entry */
996 udf_debug("Mirror metadata file location: block = %u part = %u\n",
997 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
998
999 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
1000 mdata->s_phys_partition_ref);
1001
1002 if (IS_ERR(fe)) {
1003 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
1004 return PTR_ERR(fe);
1005 }
1006 mdata->s_mirror_fe = fe;
1007 } else
1008 mdata->s_metadata_fe = fe;
1009
1010
1011 /*
1012 * bitmap file entry
1013 * Note:
1014 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1015 */
1016 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1017 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1018 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
1019
1020 udf_debug("Bitmap file location: block = %u part = %u\n",
1021 addr.logicalBlockNum, addr.partitionReferenceNum);
1022
1023 fe = udf_iget_special(sb, &addr);
1024 if (IS_ERR(fe)) {
1025 if (sb_rdonly(sb))
1026 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1027 else {
1028 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1029 return PTR_ERR(fe);
1030 }
1031 } else
1032 mdata->s_bitmap_fe = fe;
1033 }
1034
1035 udf_debug("udf_load_metadata_files Ok\n");
1036 return 0;
1037}
1038
1039int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1040{
1041 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1042 return DIV_ROUND_UP(map->s_partition_len +
1043 (sizeof(struct spaceBitmapDesc) << 3),
1044 sb->s_blocksize * 8);
1045}
1046
1047static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1048{
1049 struct udf_bitmap *bitmap;
1050 int nr_groups = udf_compute_nr_groups(sb, index);
1051
1052 bitmap = kvzalloc_flex(*bitmap, s_block_bitmap, nr_groups);
1053 if (!bitmap)
1054 return NULL;
1055
1056 bitmap->s_nr_groups = nr_groups;
1057 return bitmap;
1058}
1059
1060static int check_partition_desc(struct super_block *sb,
1061 struct partitionDesc *p,
1062 struct udf_part_map *map)
1063{
1064 bool umap, utable, fmap, ftable;
1065 struct partitionHeaderDesc *phd;
1066
1067 switch (le32_to_cpu(p->accessType)) {
1068 case PD_ACCESS_TYPE_READ_ONLY:
1069 case PD_ACCESS_TYPE_WRITE_ONCE:
1070 case PD_ACCESS_TYPE_NONE:
1071 goto force_ro;
1072 }
1073
1074 /* No Partition Header Descriptor? */
1075 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1076 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1077 goto force_ro;
1078
1079 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1080 utable = phd->unallocSpaceTable.extLength;
1081 umap = phd->unallocSpaceBitmap.extLength;
1082 ftable = phd->freedSpaceTable.extLength;
1083 fmap = phd->freedSpaceBitmap.extLength;
1084
1085 /* No allocation info? */
1086 if (!utable && !umap && !ftable && !fmap)
1087 goto force_ro;
1088
1089 /* We don't support blocks that require erasing before overwrite */
1090 if (ftable || fmap)
1091 goto force_ro;
1092 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1093 if (utable && umap)
1094 goto force_ro;
1095
1096 if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1097 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1098 map->s_partition_type == UDF_METADATA_MAP25)
1099 goto force_ro;
1100
1101 return 0;
1102force_ro:
1103 if (!sb_rdonly(sb))
1104 return -EACCES;
1105 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1106 return 0;
1107}
1108
1109static int udf_fill_partdesc_info(struct super_block *sb,
1110 struct partitionDesc *p, int p_index)
1111{
1112 struct udf_part_map *map;
1113 struct udf_sb_info *sbi = UDF_SB(sb);
1114 struct partitionHeaderDesc *phd;
1115 u32 sum;
1116 int err;
1117
1118 map = &sbi->s_partmaps[p_index];
1119
1120 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1121 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1122 if (check_add_overflow(map->s_partition_root, map->s_partition_len,
1123 &sum)) {
1124 udf_err(sb, "Partition %d has invalid location %u + %u\n",
1125 p_index, map->s_partition_root, map->s_partition_len);
1126 return -EFSCORRUPTED;
1127 }
1128
1129 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1130 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1131 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1132 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1133 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1134 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1135 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1136 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1137
1138 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1139 p_index, map->s_partition_type,
1140 map->s_partition_root, map->s_partition_len);
1141
1142 err = check_partition_desc(sb, p, map);
1143 if (err)
1144 return err;
1145
1146 /*
1147 * Skip loading allocation info it we cannot ever write to the fs.
1148 * This is a correctness thing as we may have decided to force ro mount
1149 * to avoid allocation info we don't support.
1150 */
1151 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1152 return 0;
1153
1154 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1155 if (phd->unallocSpaceTable.extLength) {
1156 struct kernel_lb_addr loc = {
1157 .logicalBlockNum = le32_to_cpu(
1158 phd->unallocSpaceTable.extPosition),
1159 .partitionReferenceNum = p_index,
1160 };
1161 struct inode *inode;
1162
1163 inode = udf_iget_special(sb, &loc);
1164 if (IS_ERR(inode)) {
1165 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1166 p_index);
1167 return PTR_ERR(inode);
1168 }
1169 map->s_uspace.s_table = inode;
1170 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1171 udf_debug("unallocSpaceTable (part %d) @ %llu\n",
1172 p_index, map->s_uspace.s_table->i_ino);
1173 }
1174
1175 if (phd->unallocSpaceBitmap.extLength) {
1176 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1177 if (!bitmap)
1178 return -ENOMEM;
1179 map->s_uspace.s_bitmap = bitmap;
1180 bitmap->s_extPosition = le32_to_cpu(
1181 phd->unallocSpaceBitmap.extPosition);
1182 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1183 /* Check whether math over bitmap won't overflow. */
1184 if (check_add_overflow(map->s_partition_len,
1185 sizeof(struct spaceBitmapDesc) << 3,
1186 &sum)) {
1187 udf_err(sb, "Partition %d is too long (%u)\n", p_index,
1188 map->s_partition_len);
1189 return -EFSCORRUPTED;
1190 }
1191 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1192 p_index, bitmap->s_extPosition);
1193 }
1194
1195 return 0;
1196}
1197
1198static void udf_find_vat_block(struct super_block *sb, int p_index,
1199 int type1_index, sector_t start_block)
1200{
1201 struct udf_sb_info *sbi = UDF_SB(sb);
1202 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1203 sector_t vat_block;
1204 struct kernel_lb_addr ino;
1205 struct inode *inode;
1206
1207 /*
1208 * VAT file entry is in the last recorded block. Some broken disks have
1209 * it a few blocks before so try a bit harder...
1210 */
1211 ino.partitionReferenceNum = type1_index;
1212 for (vat_block = start_block;
1213 vat_block >= map->s_partition_root &&
1214 vat_block >= start_block - 3; vat_block--) {
1215 ino.logicalBlockNum = vat_block - map->s_partition_root;
1216 inode = udf_iget_special(sb, &ino);
1217 if (!IS_ERR(inode)) {
1218 sbi->s_vat_inode = inode;
1219 break;
1220 }
1221 }
1222}
1223
1224static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1225{
1226 struct udf_sb_info *sbi = UDF_SB(sb);
1227 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1228 struct buffer_head *bh = NULL;
1229 struct udf_inode_info *vati;
1230 struct virtualAllocationTable20 *vat20;
1231 sector_t blocks = sb_bdev_nr_blocks(sb);
1232
1233 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1234 if (!sbi->s_vat_inode &&
1235 sbi->s_last_block != blocks - 1) {
1236 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1237 (unsigned long)sbi->s_last_block,
1238 (unsigned long)blocks - 1);
1239 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1240 }
1241 if (!sbi->s_vat_inode)
1242 return -EIO;
1243
1244 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1245 map->s_type_specific.s_virtual.s_start_offset = 0;
1246 if (sbi->s_vat_inode->i_size < 36) {
1247 udf_err(sb, "Too short VAT inode size %lld\n",
1248 sbi->s_vat_inode->i_size);
1249 return -EFSCORRUPTED;
1250 }
1251 map->s_type_specific.s_virtual.s_num_entries =
1252 (sbi->s_vat_inode->i_size - 36) >> 2;
1253 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1254 vati = UDF_I(sbi->s_vat_inode);
1255 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1256 int err = 0;
1257
1258 bh = udf_bread(sbi->s_vat_inode, 0, 0, &err);
1259 if (!bh) {
1260 if (!err)
1261 err = -EFSCORRUPTED;
1262 return err;
1263 }
1264 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1265 } else {
1266 vat20 = (struct virtualAllocationTable20 *)
1267 vati->i_data;
1268 }
1269
1270 map->s_type_specific.s_virtual.s_start_offset =
1271 le16_to_cpu(vat20->lengthHeader);
1272 if (map->s_type_specific.s_virtual.s_start_offset
1273 > sbi->s_vat_inode->i_size) {
1274 udf_err(sb, "Corrupted VAT header length %u (VAT inode size %lld)\n",
1275 map->s_type_specific.s_virtual.s_start_offset,
1276 sbi->s_vat_inode->i_size);
1277 brelse(bh);
1278 return -EFSCORRUPTED;
1279 }
1280 map->s_type_specific.s_virtual.s_num_entries =
1281 (sbi->s_vat_inode->i_size -
1282 map->s_type_specific.s_virtual.
1283 s_start_offset) >> 2;
1284 brelse(bh);
1285 }
1286 return 0;
1287}
1288
1289/*
1290 * Load partition descriptor block
1291 *
1292 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1293 * sequence.
1294 */
1295static int udf_load_partdesc(struct super_block *sb, sector_t block)
1296{
1297 struct buffer_head *bh;
1298 struct partitionDesc *p;
1299 struct udf_part_map *map;
1300 struct udf_sb_info *sbi = UDF_SB(sb);
1301 int i, type1_idx;
1302 uint16_t partitionNumber;
1303 uint16_t ident;
1304 int ret;
1305
1306 bh = udf_read_tagged(sb, block, block, &ident);
1307 if (!bh)
1308 return -EAGAIN;
1309 if (ident != TAG_IDENT_PD) {
1310 ret = 0;
1311 goto out_bh;
1312 }
1313
1314 p = (struct partitionDesc *)bh->b_data;
1315 partitionNumber = le16_to_cpu(p->partitionNumber);
1316
1317 /* First scan for TYPE1 and SPARABLE partitions */
1318 for (i = 0; i < sbi->s_partitions; i++) {
1319 map = &sbi->s_partmaps[i];
1320 udf_debug("Searching map: (%u == %u)\n",
1321 map->s_partition_num, partitionNumber);
1322 if (map->s_partition_num == partitionNumber &&
1323 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1324 map->s_partition_type == UDF_SPARABLE_MAP15))
1325 break;
1326 }
1327
1328 if (i >= sbi->s_partitions) {
1329 udf_debug("Partition (%u) not found in partition map\n",
1330 partitionNumber);
1331 ret = 0;
1332 goto out_bh;
1333 }
1334
1335 ret = udf_fill_partdesc_info(sb, p, i);
1336 if (ret < 0)
1337 goto out_bh;
1338
1339 /*
1340 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1341 * PHYSICAL partitions are already set up
1342 */
1343 type1_idx = i;
1344 map = NULL; /* supress 'maybe used uninitialized' warning */
1345 for (i = 0; i < sbi->s_partitions; i++) {
1346 map = &sbi->s_partmaps[i];
1347
1348 if (map->s_partition_num == partitionNumber &&
1349 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1350 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1351 map->s_partition_type == UDF_METADATA_MAP25))
1352 break;
1353 }
1354
1355 if (i >= sbi->s_partitions) {
1356 ret = 0;
1357 goto out_bh;
1358 }
1359
1360 ret = udf_fill_partdesc_info(sb, p, i);
1361 if (ret < 0)
1362 goto out_bh;
1363
1364 if (map->s_partition_type == UDF_METADATA_MAP25) {
1365 ret = udf_load_metadata_files(sb, i, type1_idx);
1366 if (ret < 0) {
1367 udf_err(sb, "error loading MetaData partition map %d\n",
1368 i);
1369 goto out_bh;
1370 }
1371 } else {
1372 /*
1373 * If we have a partition with virtual map, we don't handle
1374 * writing to it (we overwrite blocks instead of relocating
1375 * them).
1376 */
1377 if (!sb_rdonly(sb)) {
1378 ret = -EACCES;
1379 goto out_bh;
1380 }
1381 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1382 ret = udf_load_vat(sb, i, type1_idx);
1383 if (ret < 0)
1384 goto out_bh;
1385 }
1386 ret = 0;
1387out_bh:
1388 /* In case loading failed, we handle cleanup in udf_fill_super */
1389 brelse(bh);
1390 return ret;
1391}
1392
1393static int udf_load_sparable_map(struct super_block *sb,
1394 struct udf_part_map *map,
1395 struct sparablePartitionMap *spm)
1396{
1397 uint32_t loc;
1398 uint16_t ident;
1399 struct sparingTable *st;
1400 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1401 int i;
1402 struct buffer_head *bh;
1403
1404 map->s_partition_type = UDF_SPARABLE_MAP15;
1405 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1406 if (!is_power_of_2(sdata->s_packet_len)) {
1407 udf_err(sb, "error loading logical volume descriptor: "
1408 "Invalid packet length %u\n",
1409 (unsigned)sdata->s_packet_len);
1410 return -EIO;
1411 }
1412 if (spm->numSparingTables > 4) {
1413 udf_err(sb, "error loading logical volume descriptor: "
1414 "Too many sparing tables (%d)\n",
1415 (int)spm->numSparingTables);
1416 return -EIO;
1417 }
1418 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1419 udf_err(sb, "error loading logical volume descriptor: "
1420 "Too big sparing table size (%u)\n",
1421 le32_to_cpu(spm->sizeSparingTable));
1422 return -EIO;
1423 }
1424
1425 for (i = 0; i < spm->numSparingTables; i++) {
1426 loc = le32_to_cpu(spm->locSparingTable[i]);
1427 bh = udf_read_tagged(sb, loc, loc, &ident);
1428 if (!bh)
1429 continue;
1430
1431 st = (struct sparingTable *)bh->b_data;
1432 if (ident != 0 ||
1433 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1434 strlen(UDF_ID_SPARING)) ||
1435 struct_size(st, mapEntry,
1436 le16_to_cpu(st->reallocationTableLen)) >
1437 sb->s_blocksize) {
1438 brelse(bh);
1439 continue;
1440 }
1441
1442 sdata->s_spar_map[i] = bh;
1443 }
1444 map->s_partition_func = udf_get_pblock_spar15;
1445 return 0;
1446}
1447
1448static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1449 struct kernel_lb_addr *fileset)
1450{
1451 struct logicalVolDesc *lvd;
1452 int i, offset;
1453 uint8_t type;
1454 struct udf_sb_info *sbi = UDF_SB(sb);
1455 struct genericPartitionMap *gpm;
1456 uint16_t ident;
1457 struct buffer_head *bh;
1458 unsigned int table_len, part_map_count;
1459 int ret;
1460
1461 bh = udf_read_tagged(sb, block, block, &ident);
1462 if (!bh)
1463 return -EAGAIN;
1464 BUG_ON(ident != TAG_IDENT_LVD);
1465 lvd = (struct logicalVolDesc *)bh->b_data;
1466 table_len = le32_to_cpu(lvd->mapTableLength);
1467 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1468 udf_err(sb, "error loading logical volume descriptor: "
1469 "Partition table too long (%u > %lu)\n", table_len,
1470 sb->s_blocksize - sizeof(*lvd));
1471 ret = -EIO;
1472 goto out_bh;
1473 }
1474
1475 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1476 "logical volume");
1477 if (ret)
1478 goto out_bh;
1479
1480 part_map_count = le32_to_cpu(lvd->numPartitionMaps);
1481 if (part_map_count > table_len / sizeof(struct genericPartitionMap1)) {
1482 udf_err(sb, "error loading logical volume descriptor: "
1483 "Too many partition maps (%u > %u)\n", part_map_count,
1484 table_len / (unsigned)sizeof(struct genericPartitionMap1));
1485 ret = -EIO;
1486 goto out_bh;
1487 }
1488 ret = udf_sb_alloc_partition_maps(sb, part_map_count);
1489 if (ret)
1490 goto out_bh;
1491
1492 for (i = 0, offset = 0;
1493 i < sbi->s_partitions && offset < table_len;
1494 i++, offset += gpm->partitionMapLength) {
1495 struct udf_part_map *map = &sbi->s_partmaps[i];
1496 gpm = (struct genericPartitionMap *)
1497 &(lvd->partitionMaps[offset]);
1498 type = gpm->partitionMapType;
1499 if (type == 1) {
1500 struct genericPartitionMap1 *gpm1 =
1501 (struct genericPartitionMap1 *)gpm;
1502 map->s_partition_type = UDF_TYPE1_MAP15;
1503 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1504 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1505 map->s_partition_func = NULL;
1506 } else if (type == 2) {
1507 struct udfPartitionMap2 *upm2 =
1508 (struct udfPartitionMap2 *)gpm;
1509 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1510 strlen(UDF_ID_VIRTUAL))) {
1511 u16 suf =
1512 le16_to_cpu(((__le16 *)upm2->partIdent.
1513 identSuffix)[0]);
1514 if (suf < 0x0200) {
1515 map->s_partition_type =
1516 UDF_VIRTUAL_MAP15;
1517 map->s_partition_func =
1518 udf_get_pblock_virt15;
1519 } else {
1520 map->s_partition_type =
1521 UDF_VIRTUAL_MAP20;
1522 map->s_partition_func =
1523 udf_get_pblock_virt20;
1524 }
1525 } else if (!strncmp(upm2->partIdent.ident,
1526 UDF_ID_SPARABLE,
1527 strlen(UDF_ID_SPARABLE))) {
1528 ret = udf_load_sparable_map(sb, map,
1529 (struct sparablePartitionMap *)gpm);
1530 if (ret < 0)
1531 goto out_bh;
1532 } else if (!strncmp(upm2->partIdent.ident,
1533 UDF_ID_METADATA,
1534 strlen(UDF_ID_METADATA))) {
1535 struct udf_meta_data *mdata =
1536 &map->s_type_specific.s_metadata;
1537 struct metadataPartitionMap *mdm =
1538 (struct metadataPartitionMap *)
1539 &(lvd->partitionMaps[offset]);
1540 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
1541 i, type, UDF_ID_METADATA);
1542
1543 map->s_partition_type = UDF_METADATA_MAP25;
1544 map->s_partition_func = udf_get_pblock_meta25;
1545
1546 mdata->s_meta_file_loc =
1547 le32_to_cpu(mdm->metadataFileLoc);
1548 mdata->s_mirror_file_loc =
1549 le32_to_cpu(mdm->metadataMirrorFileLoc);
1550 mdata->s_bitmap_file_loc =
1551 le32_to_cpu(mdm->metadataBitmapFileLoc);
1552 mdata->s_alloc_unit_size =
1553 le32_to_cpu(mdm->allocUnitSize);
1554 mdata->s_align_unit_size =
1555 le16_to_cpu(mdm->alignUnitSize);
1556 if (mdm->flags & 0x01)
1557 mdata->s_flags |= MF_DUPLICATE_MD;
1558
1559 udf_debug("Metadata Ident suffix=0x%x\n",
1560 le16_to_cpu(*(__le16 *)
1561 mdm->partIdent.identSuffix));
1562 udf_debug("Metadata part num=%u\n",
1563 le16_to_cpu(mdm->partitionNum));
1564 udf_debug("Metadata part alloc unit size=%u\n",
1565 le32_to_cpu(mdm->allocUnitSize));
1566 udf_debug("Metadata file loc=%u\n",
1567 le32_to_cpu(mdm->metadataFileLoc));
1568 udf_debug("Mirror file loc=%u\n",
1569 le32_to_cpu(mdm->metadataMirrorFileLoc));
1570 udf_debug("Bitmap file loc=%u\n",
1571 le32_to_cpu(mdm->metadataBitmapFileLoc));
1572 udf_debug("Flags: %d %u\n",
1573 mdata->s_flags, mdm->flags);
1574 } else {
1575 udf_debug("Unknown ident: %s\n",
1576 upm2->partIdent.ident);
1577 continue;
1578 }
1579 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1580 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1581 }
1582 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1583 i, map->s_partition_num, type, map->s_volumeseqnum);
1584 }
1585
1586 if (fileset) {
1587 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1588
1589 *fileset = lelb_to_cpu(la->extLocation);
1590 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1591 fileset->logicalBlockNum,
1592 fileset->partitionReferenceNum);
1593 }
1594 if (lvd->integritySeqExt.extLength)
1595 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1596 ret = 0;
1597
1598 if (!sbi->s_lvid_bh) {
1599 /* We can't generate unique IDs without a valid LVID */
1600 if (sb_rdonly(sb)) {
1601 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1602 } else {
1603 udf_warn(sb, "Damaged or missing LVID, forcing "
1604 "readonly mount\n");
1605 ret = -EACCES;
1606 }
1607 }
1608out_bh:
1609 brelse(bh);
1610 return ret;
1611}
1612
1613static bool udf_lvid_valid(struct super_block *sb,
1614 struct logicalVolIntegrityDesc *lvid)
1615{
1616 u32 parts, impuselen;
1617
1618 parts = le32_to_cpu(lvid->numOfPartitions);
1619 impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1620 if (sizeof(struct logicalVolIntegrityDescImpUse) > impuselen ||
1621 impuselen >= sb->s_blocksize)
1622 return false;
1623 if (parts >= sb->s_blocksize ||
1624 sizeof(struct logicalVolIntegrityDesc) + impuselen +
1625 2 * parts * sizeof(u32) > sb->s_blocksize)
1626 return false;
1627 return true;
1628}
1629
1630/*
1631 * Find the prevailing Logical Volume Integrity Descriptor.
1632 */
1633static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1634{
1635 struct buffer_head *bh, *final_bh;
1636 uint16_t ident;
1637 struct udf_sb_info *sbi = UDF_SB(sb);
1638 struct logicalVolIntegrityDesc *lvid;
1639 int indirections = 0;
1640
1641 while (++indirections <= UDF_MAX_LVID_NESTING) {
1642 final_bh = NULL;
1643 while (loc.extLength > 0 &&
1644 (bh = udf_read_tagged(sb, loc.extLocation,
1645 loc.extLocation, &ident))) {
1646 if (ident != TAG_IDENT_LVID) {
1647 brelse(bh);
1648 break;
1649 }
1650
1651 brelse(final_bh);
1652 final_bh = bh;
1653
1654 loc.extLength -= sb->s_blocksize;
1655 loc.extLocation++;
1656 }
1657
1658 if (!final_bh)
1659 return;
1660
1661 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1662 if (udf_lvid_valid(sb, lvid)) {
1663 brelse(sbi->s_lvid_bh);
1664 sbi->s_lvid_bh = final_bh;
1665 } else {
1666 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1667 "ignoring.\n",
1668 le32_to_cpu(lvid->numOfPartitions),
1669 le32_to_cpu(lvid->lengthOfImpUse));
1670 }
1671
1672 if (lvid->nextIntegrityExt.extLength == 0)
1673 return;
1674
1675 loc = leea_to_cpu(lvid->nextIntegrityExt);
1676 }
1677
1678 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1679 UDF_MAX_LVID_NESTING);
1680 brelse(sbi->s_lvid_bh);
1681 sbi->s_lvid_bh = NULL;
1682}
1683
1684/*
1685 * Step for reallocation of table of partition descriptor sequence numbers.
1686 * Must be power of 2.
1687 */
1688#define PART_DESC_ALLOC_STEP 32
1689
1690struct part_desc_seq_scan_data {
1691 struct udf_vds_record rec;
1692 u32 partnum;
1693};
1694
1695struct desc_seq_scan_data {
1696 struct udf_vds_record vds[VDS_POS_LENGTH];
1697 unsigned int size_part_descs;
1698 unsigned int num_part_descs;
1699 struct part_desc_seq_scan_data *part_descs_loc;
1700};
1701
1702static struct udf_vds_record *handle_partition_descriptor(
1703 struct buffer_head *bh,
1704 struct desc_seq_scan_data *data)
1705{
1706 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1707 int partnum;
1708 int i;
1709
1710 partnum = le16_to_cpu(desc->partitionNumber);
1711 for (i = 0; i < data->num_part_descs; i++)
1712 if (partnum == data->part_descs_loc[i].partnum)
1713 return &(data->part_descs_loc[i].rec);
1714 if (data->num_part_descs >= data->size_part_descs) {
1715 struct part_desc_seq_scan_data *new_loc;
1716 unsigned int new_size;
1717
1718 new_size = data->num_part_descs + PART_DESC_ALLOC_STEP;
1719 new_loc = kzalloc_objs(*new_loc, new_size);
1720 if (!new_loc)
1721 return ERR_PTR(-ENOMEM);
1722 memcpy(new_loc, data->part_descs_loc,
1723 data->size_part_descs * sizeof(*new_loc));
1724 kfree(data->part_descs_loc);
1725 data->part_descs_loc = new_loc;
1726 data->size_part_descs = new_size;
1727 }
1728 data->part_descs_loc[data->num_part_descs].partnum = partnum;
1729 return &(data->part_descs_loc[data->num_part_descs++].rec);
1730}
1731
1732
1733static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1734 struct buffer_head *bh, struct desc_seq_scan_data *data)
1735{
1736 switch (ident) {
1737 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1738 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1739 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1740 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1741 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1742 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1743 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1744 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1745 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1746 return handle_partition_descriptor(bh, data);
1747 }
1748 return NULL;
1749}
1750
1751/*
1752 * Process a main/reserve volume descriptor sequence.
1753 * @block First block of first extent of the sequence.
1754 * @lastblock Lastblock of first extent of the sequence.
1755 * @fileset There we store extent containing root fileset
1756 *
1757 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1758 * sequence
1759 */
1760static noinline int udf_process_sequence(
1761 struct super_block *sb,
1762 sector_t block, sector_t lastblock,
1763 struct kernel_lb_addr *fileset)
1764{
1765 struct buffer_head *bh = NULL;
1766 struct udf_vds_record *curr;
1767 struct generic_desc *gd;
1768 struct volDescPtr *vdp;
1769 bool done = false;
1770 uint32_t vdsn;
1771 uint16_t ident;
1772 int ret;
1773 unsigned int indirections = 0;
1774 struct desc_seq_scan_data data;
1775 unsigned int i;
1776
1777 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1778 data.size_part_descs = PART_DESC_ALLOC_STEP;
1779 data.num_part_descs = 0;
1780 data.part_descs_loc = kzalloc_objs(*data.part_descs_loc,
1781 data.size_part_descs);
1782 if (!data.part_descs_loc)
1783 return -ENOMEM;
1784
1785 /*
1786 * Read the main descriptor sequence and find which descriptors
1787 * are in it.
1788 */
1789 for (; (!done && block <= lastblock); block++) {
1790 bh = udf_read_tagged(sb, block, block, &ident);
1791 if (!bh)
1792 break;
1793
1794 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1795 gd = (struct generic_desc *)bh->b_data;
1796 vdsn = le32_to_cpu(gd->volDescSeqNum);
1797 switch (ident) {
1798 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1799 if (++indirections > UDF_MAX_TD_NESTING) {
1800 udf_err(sb, "too many Volume Descriptor "
1801 "Pointers (max %u supported)\n",
1802 UDF_MAX_TD_NESTING);
1803 brelse(bh);
1804 ret = -EIO;
1805 goto out;
1806 }
1807
1808 vdp = (struct volDescPtr *)bh->b_data;
1809 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1810 lastblock = le32_to_cpu(
1811 vdp->nextVolDescSeqExt.extLength) >>
1812 sb->s_blocksize_bits;
1813 lastblock += block - 1;
1814 /* For loop is going to increment 'block' again */
1815 block--;
1816 break;
1817 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1818 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1819 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1820 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1821 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1822 curr = get_volume_descriptor_record(ident, bh, &data);
1823 if (IS_ERR(curr)) {
1824 brelse(bh);
1825 ret = PTR_ERR(curr);
1826 goto out;
1827 }
1828 /* Descriptor we don't care about? */
1829 if (!curr)
1830 break;
1831 if (vdsn >= curr->volDescSeqNum) {
1832 curr->volDescSeqNum = vdsn;
1833 curr->block = block;
1834 }
1835 break;
1836 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1837 done = true;
1838 break;
1839 }
1840 brelse(bh);
1841 }
1842 /*
1843 * Now read interesting descriptors again and process them
1844 * in a suitable order
1845 */
1846 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1847 udf_err(sb, "Primary Volume Descriptor not found!\n");
1848 ret = -EAGAIN;
1849 goto out;
1850 }
1851 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1852 if (ret < 0)
1853 goto out;
1854
1855 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1856 ret = udf_load_logicalvol(sb,
1857 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1858 fileset);
1859 if (ret < 0)
1860 goto out;
1861 }
1862
1863 /* Now handle prevailing Partition Descriptors */
1864 for (i = 0; i < data.num_part_descs; i++) {
1865 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1866 if (ret < 0)
1867 goto out;
1868 }
1869 ret = 0;
1870out:
1871 kfree(data.part_descs_loc);
1872 return ret;
1873}
1874
1875/*
1876 * Load Volume Descriptor Sequence described by anchor in bh
1877 *
1878 * Returns <0 on error, 0 on success
1879 */
1880static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1881 struct kernel_lb_addr *fileset)
1882{
1883 struct anchorVolDescPtr *anchor;
1884 sector_t main_s, main_e, reserve_s, reserve_e;
1885 int ret;
1886
1887 anchor = (struct anchorVolDescPtr *)bh->b_data;
1888
1889 /* Locate the main sequence */
1890 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1891 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1892 main_e = main_e >> sb->s_blocksize_bits;
1893 main_e += main_s - 1;
1894
1895 /* Locate the reserve sequence */
1896 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1897 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1898 reserve_e = reserve_e >> sb->s_blocksize_bits;
1899 reserve_e += reserve_s - 1;
1900
1901 /* Process the main & reserve sequences */
1902 /* responsible for finding the PartitionDesc(s) */
1903 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1904 if (ret != -EAGAIN)
1905 return ret;
1906 udf_sb_free_partitions(sb);
1907 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1908 if (ret < 0) {
1909 udf_sb_free_partitions(sb);
1910 /* No sequence was OK, return -EIO */
1911 if (ret == -EAGAIN)
1912 ret = -EIO;
1913 }
1914 return ret;
1915}
1916
1917/*
1918 * Check whether there is an anchor block in the given block and
1919 * load Volume Descriptor Sequence if so.
1920 *
1921 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1922 * block
1923 */
1924static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1925 struct kernel_lb_addr *fileset)
1926{
1927 struct buffer_head *bh;
1928 uint16_t ident;
1929 int ret;
1930
1931 bh = udf_read_tagged(sb, block, block, &ident);
1932 if (!bh)
1933 return -EAGAIN;
1934 if (ident != TAG_IDENT_AVDP) {
1935 brelse(bh);
1936 return -EAGAIN;
1937 }
1938 ret = udf_load_sequence(sb, bh, fileset);
1939 brelse(bh);
1940 return ret;
1941}
1942
1943/*
1944 * Search for an anchor volume descriptor pointer.
1945 *
1946 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1947 * of anchors.
1948 */
1949static int udf_scan_anchors(struct super_block *sb, udf_pblk_t *lastblock,
1950 struct kernel_lb_addr *fileset)
1951{
1952 udf_pblk_t last[6];
1953 int i;
1954 struct udf_sb_info *sbi = UDF_SB(sb);
1955 int last_count = 0;
1956 int ret;
1957
1958 /* First try user provided anchor */
1959 if (sbi->s_anchor) {
1960 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1961 if (ret != -EAGAIN)
1962 return ret;
1963 }
1964 /*
1965 * according to spec, anchor is in either:
1966 * block 256
1967 * lastblock-256
1968 * lastblock
1969 * however, if the disc isn't closed, it could be 512.
1970 */
1971 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1972 if (ret != -EAGAIN)
1973 return ret;
1974 /*
1975 * The trouble is which block is the last one. Drives often misreport
1976 * this so we try various possibilities.
1977 */
1978 last[last_count++] = *lastblock;
1979 if (*lastblock >= 1)
1980 last[last_count++] = *lastblock - 1;
1981 last[last_count++] = *lastblock + 1;
1982 if (*lastblock >= 2)
1983 last[last_count++] = *lastblock - 2;
1984 if (*lastblock >= 150)
1985 last[last_count++] = *lastblock - 150;
1986 if (*lastblock >= 152)
1987 last[last_count++] = *lastblock - 152;
1988
1989 for (i = 0; i < last_count; i++) {
1990 if (last[i] >= sb_bdev_nr_blocks(sb))
1991 continue;
1992 ret = udf_check_anchor_block(sb, last[i], fileset);
1993 if (ret != -EAGAIN) {
1994 if (!ret)
1995 *lastblock = last[i];
1996 return ret;
1997 }
1998 if (last[i] < 256)
1999 continue;
2000 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
2001 if (ret != -EAGAIN) {
2002 if (!ret)
2003 *lastblock = last[i];
2004 return ret;
2005 }
2006 }
2007
2008 /* Finally try block 512 in case media is open */
2009 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
2010}
2011
2012/*
2013 * Check Volume Structure Descriptor, find Anchor block and load Volume
2014 * Descriptor Sequence.
2015 *
2016 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
2017 * block was not found.
2018 */
2019static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
2020 int silent, struct kernel_lb_addr *fileset)
2021{
2022 struct udf_sb_info *sbi = UDF_SB(sb);
2023 int nsr = 0;
2024 int ret;
2025
2026 if (!sb_set_blocksize(sb, uopt->blocksize)) {
2027 if (!silent)
2028 udf_warn(sb, "Bad block size\n");
2029 return -EINVAL;
2030 }
2031 sbi->s_last_block = uopt->lastblock;
2032 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_NOVRS)) {
2033 /* Check that it is NSR02 compliant */
2034 nsr = udf_check_vsd(sb);
2035 if (!nsr) {
2036 if (!silent)
2037 udf_warn(sb, "No VRS found\n");
2038 return -EINVAL;
2039 }
2040 if (nsr == -1)
2041 udf_debug("Failed to read sector at offset %d. "
2042 "Assuming open disc. Skipping validity "
2043 "check\n", VSD_FIRST_SECTOR_OFFSET);
2044 if (!sbi->s_last_block)
2045 sbi->s_last_block = udf_get_last_block(sb);
2046 } else {
2047 udf_debug("Validity check skipped because of novrs option\n");
2048 }
2049
2050 /* Look for anchor block and load Volume Descriptor Sequence */
2051 sbi->s_anchor = uopt->anchor;
2052 ret = udf_scan_anchors(sb, &sbi->s_last_block, fileset);
2053 if (ret < 0) {
2054 if (!silent && ret == -EAGAIN)
2055 udf_warn(sb, "No anchor found\n");
2056 return ret;
2057 }
2058 return 0;
2059}
2060
2061static void udf_mark_buffer_dirty(struct buffer_head *bh)
2062{
2063 /*
2064 * We set buffer uptodate unconditionally here to avoid spurious
2065 * warnings from mark_buffer_dirty() when previous EIO has marked
2066 * the buffer as !uptodate
2067 */
2068 set_buffer_uptodate(bh);
2069 mark_buffer_dirty(bh);
2070}
2071
2072static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2073{
2074 struct timespec64 ts;
2075
2076 ktime_get_real_ts64(&ts);
2077 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2078 lvid->descTag.descCRC = cpu_to_le16(
2079 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2080 le16_to_cpu(lvid->descTag.descCRCLength)));
2081 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2082}
2083
2084static void udf_open_lvid(struct super_block *sb)
2085{
2086 struct udf_sb_info *sbi = UDF_SB(sb);
2087 struct buffer_head *bh = sbi->s_lvid_bh;
2088 struct logicalVolIntegrityDesc *lvid;
2089 struct logicalVolIntegrityDescImpUse *lvidiu;
2090
2091 if (!bh)
2092 return;
2093 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2094 lvidiu = udf_sb_lvidiu(sb);
2095 if (!lvidiu)
2096 return;
2097
2098 mutex_lock(&sbi->s_alloc_mutex);
2099 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2100 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2101 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2102 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2103 else
2104 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2105
2106 udf_finalize_lvid(lvid);
2107 udf_mark_buffer_dirty(bh);
2108 sbi->s_lvid_dirty = 0;
2109 mutex_unlock(&sbi->s_alloc_mutex);
2110 /* Make opening of filesystem visible on the media immediately */
2111 sync_dirty_buffer(bh);
2112}
2113
2114static void udf_close_lvid(struct super_block *sb)
2115{
2116 struct udf_sb_info *sbi = UDF_SB(sb);
2117 struct buffer_head *bh = sbi->s_lvid_bh;
2118 struct logicalVolIntegrityDesc *lvid;
2119 struct logicalVolIntegrityDescImpUse *lvidiu;
2120
2121 if (!bh)
2122 return;
2123 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2124 lvidiu = udf_sb_lvidiu(sb);
2125 if (!lvidiu)
2126 return;
2127
2128 mutex_lock(&sbi->s_alloc_mutex);
2129 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2130 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2131 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2132 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2133 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2134 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2135 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2136 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2137 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2138 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2139
2140 udf_finalize_lvid(lvid);
2141 udf_mark_buffer_dirty(bh);
2142 sbi->s_lvid_dirty = 0;
2143 mutex_unlock(&sbi->s_alloc_mutex);
2144 /* Make closing of filesystem visible on the media immediately */
2145 sync_dirty_buffer(bh);
2146}
2147
2148u64 lvid_get_unique_id(struct super_block *sb)
2149{
2150 struct buffer_head *bh;
2151 struct udf_sb_info *sbi = UDF_SB(sb);
2152 struct logicalVolIntegrityDesc *lvid;
2153 struct logicalVolHeaderDesc *lvhd;
2154 u64 uniqueID;
2155 u64 ret;
2156
2157 bh = sbi->s_lvid_bh;
2158 if (!bh)
2159 return 0;
2160
2161 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2162 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2163
2164 mutex_lock(&sbi->s_alloc_mutex);
2165 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2166 if (!(++uniqueID & 0xFFFFFFFF))
2167 uniqueID += 16;
2168 lvhd->uniqueID = cpu_to_le64(uniqueID);
2169 udf_updated_lvid(sb);
2170 mutex_unlock(&sbi->s_alloc_mutex);
2171
2172 return ret;
2173}
2174
2175static int udf_fill_super(struct super_block *sb, struct fs_context *fc)
2176{
2177 int ret = -EINVAL;
2178 struct inode *inode = NULL;
2179 struct udf_options *uopt = fc->fs_private;
2180 struct kernel_lb_addr rootdir, fileset;
2181 struct udf_sb_info *sbi;
2182 bool lvid_open = false;
2183 int silent = fc->sb_flags & SB_SILENT;
2184
2185 sbi = kzalloc_obj(*sbi);
2186 if (!sbi)
2187 return -ENOMEM;
2188
2189 sb->s_fs_info = sbi;
2190
2191 mutex_init(&sbi->s_alloc_mutex);
2192
2193 fileset.logicalBlockNum = 0xFFFFFFFF;
2194 fileset.partitionReferenceNum = 0xFFFF;
2195
2196 sbi->s_flags = uopt->flags;
2197 sbi->s_uid = uopt->uid;
2198 sbi->s_gid = uopt->gid;
2199 sbi->s_umask = uopt->umask;
2200 sbi->s_fmode = uopt->fmode;
2201 sbi->s_dmode = uopt->dmode;
2202 sbi->s_nls_map = uopt->nls_map;
2203 uopt->nls_map = NULL;
2204 rwlock_init(&sbi->s_cred_lock);
2205
2206 if (uopt->session == 0xFFFFFFFF)
2207 sbi->s_session = udf_get_last_session(sb);
2208 else
2209 sbi->s_session = uopt->session;
2210
2211 udf_debug("Multi-session=%d\n", sbi->s_session);
2212
2213 /* Fill in the rest of the superblock */
2214 sb->s_op = &udf_sb_ops;
2215 sb->s_export_op = &udf_export_ops;
2216
2217 sb->s_magic = UDF_SUPER_MAGIC;
2218 sb->s_time_gran = 1000;
2219
2220 if (uopt->flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2221 ret = udf_load_vrs(sb, uopt, silent, &fileset);
2222 } else {
2223 uopt->blocksize = bdev_logical_block_size(sb->s_bdev);
2224 while (uopt->blocksize <= 4096) {
2225 ret = udf_load_vrs(sb, uopt, silent, &fileset);
2226 if (ret < 0) {
2227 if (!silent && ret != -EACCES) {
2228 pr_notice("Scanning with blocksize %u failed\n",
2229 uopt->blocksize);
2230 }
2231 brelse(sbi->s_lvid_bh);
2232 sbi->s_lvid_bh = NULL;
2233 /*
2234 * EACCES is special - we want to propagate to
2235 * upper layers that we cannot handle RW mount.
2236 */
2237 if (ret == -EACCES)
2238 break;
2239 } else
2240 break;
2241
2242 uopt->blocksize <<= 1;
2243 }
2244 }
2245 if (ret < 0) {
2246 if (ret == -EAGAIN) {
2247 udf_warn(sb, "No partition found (1)\n");
2248 ret = -EINVAL;
2249 }
2250 goto error_out;
2251 }
2252
2253 udf_debug("Lastblock=%u\n", sbi->s_last_block);
2254
2255 if (sbi->s_lvid_bh) {
2256 struct logicalVolIntegrityDescImpUse *lvidiu =
2257 udf_sb_lvidiu(sb);
2258 uint16_t minUDFReadRev;
2259 uint16_t minUDFWriteRev;
2260
2261 if (!lvidiu) {
2262 ret = -EINVAL;
2263 goto error_out;
2264 }
2265 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2266 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2267 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2268 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2269 minUDFReadRev,
2270 UDF_MAX_READ_VERSION);
2271 ret = -EINVAL;
2272 goto error_out;
2273 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2274 if (!sb_rdonly(sb)) {
2275 ret = -EACCES;
2276 goto error_out;
2277 }
2278 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2279 }
2280
2281 sbi->s_udfrev = minUDFWriteRev;
2282
2283 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2284 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2285 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2286 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2287 }
2288
2289 if (!sbi->s_partitions) {
2290 udf_warn(sb, "No partition found (2)\n");
2291 ret = -EINVAL;
2292 goto error_out;
2293 }
2294
2295 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2296 UDF_PART_FLAG_READ_ONLY) {
2297 if (!sb_rdonly(sb)) {
2298 ret = -EACCES;
2299 goto error_out;
2300 }
2301 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2302 }
2303
2304 ret = udf_find_fileset(sb, &fileset, &rootdir);
2305 if (ret < 0) {
2306 udf_warn(sb, "No fileset found\n");
2307 goto error_out;
2308 }
2309
2310 if (!silent) {
2311 struct timestamp ts;
2312 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2313 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2314 sbi->s_volume_ident,
2315 le16_to_cpu(ts.year), ts.month, ts.day,
2316 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2317 }
2318 if (!sb_rdonly(sb)) {
2319 udf_open_lvid(sb);
2320 lvid_open = true;
2321 }
2322
2323 /* Assign the root inode */
2324 /* assign inodes by physical block number */
2325 /* perhaps it's not extensible enough, but for now ... */
2326 inode = udf_iget(sb, &rootdir);
2327 if (IS_ERR(inode)) {
2328 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2329 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2330 ret = PTR_ERR(inode);
2331 goto error_out;
2332 }
2333
2334 /* Allocate a dentry for the root inode */
2335 sb->s_root = d_make_root(inode);
2336 if (!sb->s_root) {
2337 udf_err(sb, "Couldn't allocate root dentry\n");
2338 ret = -ENOMEM;
2339 goto error_out;
2340 }
2341 sb->s_maxbytes = UDF_MAX_FILESIZE;
2342 sb->s_max_links = UDF_MAX_LINKS;
2343 return 0;
2344
2345error_out:
2346 iput(sbi->s_vat_inode);
2347 unload_nls(sbi->s_nls_map);
2348 if (lvid_open)
2349 udf_close_lvid(sb);
2350 brelse(sbi->s_lvid_bh);
2351 udf_sb_free_partitions(sb);
2352 kfree(sbi);
2353 sb->s_fs_info = NULL;
2354
2355 return ret;
2356}
2357
2358void _udf_err(struct super_block *sb, const char *function,
2359 const char *fmt, ...)
2360{
2361 struct va_format vaf;
2362 va_list args;
2363
2364 va_start(args, fmt);
2365
2366 vaf.fmt = fmt;
2367 vaf.va = &args;
2368
2369 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2370
2371 va_end(args);
2372}
2373
2374void _udf_warn(struct super_block *sb, const char *function,
2375 const char *fmt, ...)
2376{
2377 struct va_format vaf;
2378 va_list args;
2379
2380 va_start(args, fmt);
2381
2382 vaf.fmt = fmt;
2383 vaf.va = &args;
2384
2385 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2386
2387 va_end(args);
2388}
2389
2390static void udf_put_super(struct super_block *sb)
2391{
2392 struct udf_sb_info *sbi;
2393
2394 sbi = UDF_SB(sb);
2395
2396 iput(sbi->s_vat_inode);
2397 unload_nls(sbi->s_nls_map);
2398 if (!sb_rdonly(sb))
2399 udf_close_lvid(sb);
2400 brelse(sbi->s_lvid_bh);
2401 udf_sb_free_partitions(sb);
2402 mutex_destroy(&sbi->s_alloc_mutex);
2403 kfree(sb->s_fs_info);
2404 sb->s_fs_info = NULL;
2405}
2406
2407static int udf_sync_fs(struct super_block *sb, int wait)
2408{
2409 struct udf_sb_info *sbi = UDF_SB(sb);
2410
2411 mutex_lock(&sbi->s_alloc_mutex);
2412 if (sbi->s_lvid_dirty) {
2413 struct buffer_head *bh = sbi->s_lvid_bh;
2414 struct logicalVolIntegrityDesc *lvid;
2415
2416 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2417 udf_finalize_lvid(lvid);
2418
2419 /*
2420 * Blockdevice will be synced later so we don't have to submit
2421 * the buffer for IO
2422 */
2423 udf_mark_buffer_dirty(bh);
2424 sbi->s_lvid_dirty = 0;
2425 }
2426 mutex_unlock(&sbi->s_alloc_mutex);
2427
2428 return 0;
2429}
2430
2431static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2432{
2433 struct super_block *sb = dentry->d_sb;
2434 struct udf_sb_info *sbi = UDF_SB(sb);
2435 struct logicalVolIntegrityDescImpUse *lvidiu;
2436 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2437
2438 lvidiu = udf_sb_lvidiu(sb);
2439 buf->f_type = UDF_SUPER_MAGIC;
2440 buf->f_bsize = sb->s_blocksize;
2441 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2442 buf->f_bfree = udf_count_free(sb);
2443 buf->f_bavail = buf->f_bfree;
2444 /*
2445 * Let's pretend each free block is also a free 'inode' since UDF does
2446 * not have separate preallocated table of inodes.
2447 */
2448 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2449 le32_to_cpu(lvidiu->numDirs)) : 0)
2450 + buf->f_bfree;
2451 buf->f_ffree = buf->f_bfree;
2452 buf->f_namelen = UDF_NAME_LEN;
2453 buf->f_fsid = u64_to_fsid(id);
2454
2455 return 0;
2456}
2457
2458static unsigned int udf_count_free_bitmap(struct super_block *sb,
2459 struct udf_bitmap *bitmap)
2460{
2461 struct buffer_head *bh = NULL;
2462 unsigned int accum = 0;
2463 int index;
2464 udf_pblk_t block = 0, newblock;
2465 struct kernel_lb_addr loc;
2466 uint32_t bytes;
2467 uint8_t *ptr;
2468 uint16_t ident;
2469 struct spaceBitmapDesc *bm;
2470
2471 loc.logicalBlockNum = bitmap->s_extPosition;
2472 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2473 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2474
2475 if (!bh) {
2476 udf_err(sb, "udf_count_free failed\n");
2477 goto out;
2478 } else if (ident != TAG_IDENT_SBD) {
2479 brelse(bh);
2480 udf_err(sb, "udf_count_free failed\n");
2481 goto out;
2482 }
2483
2484 bm = (struct spaceBitmapDesc *)bh->b_data;
2485 bytes = le32_to_cpu(bm->numOfBytes);
2486 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2487 ptr = (uint8_t *)bh->b_data;
2488
2489 while (bytes > 0) {
2490 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2491 accum += bitmap_weight((const unsigned long *)(ptr + index),
2492 cur_bytes * 8);
2493 bytes -= cur_bytes;
2494 if (bytes) {
2495 brelse(bh);
2496 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2497 bh = sb_bread(sb, newblock);
2498 if (!bh) {
2499 udf_debug("read failed\n");
2500 goto out;
2501 }
2502 index = 0;
2503 ptr = (uint8_t *)bh->b_data;
2504 }
2505 }
2506 brelse(bh);
2507out:
2508 return accum;
2509}
2510
2511static unsigned int udf_count_free_table(struct super_block *sb,
2512 struct inode *table)
2513{
2514 unsigned int accum = 0;
2515 uint32_t elen;
2516 struct kernel_lb_addr eloc;
2517 struct extent_position epos;
2518 int8_t etype;
2519
2520 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2521 epos.block = UDF_I(table)->i_location;
2522 epos.offset = sizeof(struct unallocSpaceEntry);
2523 epos.bh = NULL;
2524
2525 while (udf_next_aext(table, &epos, &eloc, &elen, &etype, 1) > 0)
2526 accum += (elen >> table->i_sb->s_blocksize_bits);
2527
2528 brelse(epos.bh);
2529 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2530
2531 return accum;
2532}
2533
2534static unsigned int udf_count_free(struct super_block *sb)
2535{
2536 unsigned int accum = 0;
2537 struct udf_sb_info *sbi = UDF_SB(sb);
2538 struct udf_part_map *map;
2539 unsigned int part = sbi->s_partition;
2540 int ptype = sbi->s_partmaps[part].s_partition_type;
2541
2542 if (ptype == UDF_METADATA_MAP25) {
2543 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2544 s_phys_partition_ref;
2545 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2546 /*
2547 * Filesystems with VAT are append-only and we cannot write to
2548 * them. Let's just report 0 here.
2549 */
2550 return 0;
2551 }
2552
2553 if (sbi->s_lvid_bh) {
2554 struct logicalVolIntegrityDesc *lvid =
2555 (struct logicalVolIntegrityDesc *)
2556 sbi->s_lvid_bh->b_data;
2557 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2558 accum = le32_to_cpu(
2559 lvid->freeSpaceTable[part]);
2560 if (accum == 0xFFFFFFFF)
2561 accum = 0;
2562 }
2563 }
2564
2565 if (accum)
2566 return accum;
2567
2568 map = &sbi->s_partmaps[part];
2569 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2570 accum += udf_count_free_bitmap(sb,
2571 map->s_uspace.s_bitmap);
2572 }
2573 if (accum)
2574 return accum;
2575
2576 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2577 accum += udf_count_free_table(sb,
2578 map->s_uspace.s_table);
2579 }
2580 return accum;
2581}
2582
2583MODULE_AUTHOR("Ben Fennema");
2584MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2585MODULE_LICENSE("GPL");
2586module_init(init_udf_fs)
2587module_exit(exit_udf_fs)