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
64 enum {
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
84 enum { 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 */
94 static int udf_fill_super(struct super_block *sb, struct fs_context *fc);
95 static void udf_put_super(struct super_block *);
96 static int udf_sync_fs(struct super_block *, int);
97 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
98 static void udf_open_lvid(struct super_block *);
99 static void udf_close_lvid(struct super_block *);
100 static unsigned int udf_count_free(struct super_block *);
101 static int udf_statfs(struct dentry *, struct kstatfs *);
102 static int udf_show_options(struct seq_file *, struct dentry *);
103 static int udf_init_fs_context(struct fs_context *fc);
104 static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param);
105 static int udf_reconfigure(struct fs_context *fc);
106 static void udf_free_fc(struct fs_context *fc);
107 static const struct fs_parameter_spec udf_param_spec[];
108
udf_sb_lvidiu(struct super_block * sb)109 struct 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 */
udf_get_tree(struct fs_context * fc)126 static int udf_get_tree(struct fs_context *fc)
127 {
128 return get_tree_bdev(fc, udf_fill_super);
129 }
130
131 static 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
138 static 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 };
146 MODULE_ALIAS_FS("udf");
147
148 static struct kmem_cache *udf_inode_cachep;
149
udf_alloc_inode(struct super_block * sb)150 static 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
udf_free_in_core_inode(struct inode * inode)173 static void udf_free_in_core_inode(struct inode *inode)
174 {
175 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
176 }
177
init_once(void * foo)178 static 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
init_inodecache(void)186 static 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
destroy_inodecache(void)198 static 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 */
209 static 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
220 struct 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 */
udf_init_options(struct fs_context * fc,struct udf_options * uopt)239 static 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
udf_init_fs_context(struct fs_context * fc)269 static int udf_init_fs_context(struct fs_context *fc)
270 {
271 struct udf_options *uopt;
272
273 uopt = kzalloc_obj(*uopt);
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
udf_free_fc(struct fs_context * fc)285 static 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
init_udf_fs(void)293 static 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
306 out:
307 destroy_inodecache();
308
309 out1:
310 return err;
311 }
312
exit_udf_fs(void)313 static void __exit exit_udf_fs(void)
314 {
315 unregister_filesystem(&udf_fstype);
316 destroy_inodecache();
317 }
318
udf_sb_alloc_partition_maps(struct super_block * sb,u32 count)319 static 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 = kzalloc_objs(*sbi->s_partmaps, count);
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
udf_sb_free_bitmap(struct udf_bitmap * bitmap)333 static 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
udf_free_partition(struct udf_part_map * map)345 static 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
udf_sb_free_partitions(struct super_block * sb)370 static 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
udf_show_options(struct seq_file * seq,struct dentry * root)383 static 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
484 enum {
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
492 static 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
udf_parse_param(struct fs_context * fc,struct fs_parameter * param)518 static 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
udf_reconfigure(struct fs_context * fc)650 static 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
680 out_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 */
identify_vsd(const struct volStructDesc * vsd)689 static 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 */
udf_check_vsd(struct super_block * sb)738 static 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
udf_verify_domain_identifier(struct super_block * sb,struct regid * ident,char * dname)806 static 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
831 force_ro:
832 if (!sb_rdonly(sb))
833 return -EACCES;
834 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
835 return 0;
836 }
837
udf_load_fileset(struct super_block * sb,struct fileSetDesc * fset,struct kernel_lb_addr * root)838 static 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
udf_find_fileset(struct super_block * sb,struct kernel_lb_addr * fileset,struct kernel_lb_addr * root)855 static 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 */
udf_load_pvoldesc(struct super_block * sb,sector_t block)890 static 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;
942 out_bh:
943 brelse(bh);
944 out2:
945 kfree(outstr);
946 return ret;
947 }
948
udf_find_metadata_inode_efe(struct super_block * sb,u32 meta_file_loc,u32 partition_ref)949 struct 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
udf_load_metadata_files(struct super_block * sb,int partition,int type1_index)973 static 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
udf_compute_nr_groups(struct super_block * sb,u32 partition)1037 int 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
udf_sb_alloc_bitmap(struct super_block * sb,u32 index)1045 static 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_flex(*bitmap, s_block_bitmap, nr_groups);
1051 if (!bitmap)
1052 return NULL;
1053
1054 bitmap->s_nr_groups = nr_groups;
1055 return bitmap;
1056 }
1057
check_partition_desc(struct super_block * sb,struct partitionDesc * p,struct udf_part_map * map)1058 static int check_partition_desc(struct super_block *sb,
1059 struct partitionDesc *p,
1060 struct udf_part_map *map)
1061 {
1062 bool umap, utable, fmap, ftable;
1063 struct partitionHeaderDesc *phd;
1064
1065 switch (le32_to_cpu(p->accessType)) {
1066 case PD_ACCESS_TYPE_READ_ONLY:
1067 case PD_ACCESS_TYPE_WRITE_ONCE:
1068 case PD_ACCESS_TYPE_NONE:
1069 goto force_ro;
1070 }
1071
1072 /* No Partition Header Descriptor? */
1073 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1074 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1075 goto force_ro;
1076
1077 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1078 utable = phd->unallocSpaceTable.extLength;
1079 umap = phd->unallocSpaceBitmap.extLength;
1080 ftable = phd->freedSpaceTable.extLength;
1081 fmap = phd->freedSpaceBitmap.extLength;
1082
1083 /* No allocation info? */
1084 if (!utable && !umap && !ftable && !fmap)
1085 goto force_ro;
1086
1087 /* We don't support blocks that require erasing before overwrite */
1088 if (ftable || fmap)
1089 goto force_ro;
1090 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1091 if (utable && umap)
1092 goto force_ro;
1093
1094 if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1095 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1096 map->s_partition_type == UDF_METADATA_MAP25)
1097 goto force_ro;
1098
1099 return 0;
1100 force_ro:
1101 if (!sb_rdonly(sb))
1102 return -EACCES;
1103 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1104 return 0;
1105 }
1106
udf_fill_partdesc_info(struct super_block * sb,struct partitionDesc * p,int p_index)1107 static int udf_fill_partdesc_info(struct super_block *sb,
1108 struct partitionDesc *p, int p_index)
1109 {
1110 struct udf_part_map *map;
1111 struct udf_sb_info *sbi = UDF_SB(sb);
1112 struct partitionHeaderDesc *phd;
1113 u32 sum;
1114 int err;
1115
1116 map = &sbi->s_partmaps[p_index];
1117
1118 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1119 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1120 if (check_add_overflow(map->s_partition_root, map->s_partition_len,
1121 &sum)) {
1122 udf_err(sb, "Partition %d has invalid location %u + %u\n",
1123 p_index, map->s_partition_root, map->s_partition_len);
1124 return -EFSCORRUPTED;
1125 }
1126
1127 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1128 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1129 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1130 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1131 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1132 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1133 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1134 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1135
1136 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1137 p_index, map->s_partition_type,
1138 map->s_partition_root, map->s_partition_len);
1139
1140 err = check_partition_desc(sb, p, map);
1141 if (err)
1142 return err;
1143
1144 /*
1145 * Skip loading allocation info it we cannot ever write to the fs.
1146 * This is a correctness thing as we may have decided to force ro mount
1147 * to avoid allocation info we don't support.
1148 */
1149 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1150 return 0;
1151
1152 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1153 if (phd->unallocSpaceTable.extLength) {
1154 struct kernel_lb_addr loc = {
1155 .logicalBlockNum = le32_to_cpu(
1156 phd->unallocSpaceTable.extPosition),
1157 .partitionReferenceNum = p_index,
1158 };
1159 struct inode *inode;
1160
1161 inode = udf_iget_special(sb, &loc);
1162 if (IS_ERR(inode)) {
1163 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1164 p_index);
1165 return PTR_ERR(inode);
1166 }
1167 map->s_uspace.s_table = inode;
1168 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1169 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1170 p_index, map->s_uspace.s_table->i_ino);
1171 }
1172
1173 if (phd->unallocSpaceBitmap.extLength) {
1174 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1175 if (!bitmap)
1176 return -ENOMEM;
1177 map->s_uspace.s_bitmap = bitmap;
1178 bitmap->s_extPosition = le32_to_cpu(
1179 phd->unallocSpaceBitmap.extPosition);
1180 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1181 /* Check whether math over bitmap won't overflow. */
1182 if (check_add_overflow(map->s_partition_len,
1183 sizeof(struct spaceBitmapDesc) << 3,
1184 &sum)) {
1185 udf_err(sb, "Partition %d is too long (%u)\n", p_index,
1186 map->s_partition_len);
1187 return -EFSCORRUPTED;
1188 }
1189 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1190 p_index, bitmap->s_extPosition);
1191 }
1192
1193 return 0;
1194 }
1195
udf_find_vat_block(struct super_block * sb,int p_index,int type1_index,sector_t start_block)1196 static void udf_find_vat_block(struct super_block *sb, int p_index,
1197 int type1_index, sector_t start_block)
1198 {
1199 struct udf_sb_info *sbi = UDF_SB(sb);
1200 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1201 sector_t vat_block;
1202 struct kernel_lb_addr ino;
1203 struct inode *inode;
1204
1205 /*
1206 * VAT file entry is in the last recorded block. Some broken disks have
1207 * it a few blocks before so try a bit harder...
1208 */
1209 ino.partitionReferenceNum = type1_index;
1210 for (vat_block = start_block;
1211 vat_block >= map->s_partition_root &&
1212 vat_block >= start_block - 3; vat_block--) {
1213 ino.logicalBlockNum = vat_block - map->s_partition_root;
1214 inode = udf_iget_special(sb, &ino);
1215 if (!IS_ERR(inode)) {
1216 sbi->s_vat_inode = inode;
1217 break;
1218 }
1219 }
1220 }
1221
udf_load_vat(struct super_block * sb,int p_index,int type1_index)1222 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1223 {
1224 struct udf_sb_info *sbi = UDF_SB(sb);
1225 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1226 struct buffer_head *bh = NULL;
1227 struct udf_inode_info *vati;
1228 struct virtualAllocationTable20 *vat20;
1229 sector_t blocks = sb_bdev_nr_blocks(sb);
1230
1231 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1232 if (!sbi->s_vat_inode &&
1233 sbi->s_last_block != blocks - 1) {
1234 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1235 (unsigned long)sbi->s_last_block,
1236 (unsigned long)blocks - 1);
1237 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1238 }
1239 if (!sbi->s_vat_inode)
1240 return -EIO;
1241
1242 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1243 map->s_type_specific.s_virtual.s_start_offset = 0;
1244 map->s_type_specific.s_virtual.s_num_entries =
1245 (sbi->s_vat_inode->i_size - 36) >> 2;
1246 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1247 vati = UDF_I(sbi->s_vat_inode);
1248 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1249 int err = 0;
1250
1251 bh = udf_bread(sbi->s_vat_inode, 0, 0, &err);
1252 if (!bh) {
1253 if (!err)
1254 err = -EFSCORRUPTED;
1255 return err;
1256 }
1257 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1258 } else {
1259 vat20 = (struct virtualAllocationTable20 *)
1260 vati->i_data;
1261 }
1262
1263 map->s_type_specific.s_virtual.s_start_offset =
1264 le16_to_cpu(vat20->lengthHeader);
1265 map->s_type_specific.s_virtual.s_num_entries =
1266 (sbi->s_vat_inode->i_size -
1267 map->s_type_specific.s_virtual.
1268 s_start_offset) >> 2;
1269 brelse(bh);
1270 }
1271 return 0;
1272 }
1273
1274 /*
1275 * Load partition descriptor block
1276 *
1277 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1278 * sequence.
1279 */
udf_load_partdesc(struct super_block * sb,sector_t block)1280 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1281 {
1282 struct buffer_head *bh;
1283 struct partitionDesc *p;
1284 struct udf_part_map *map;
1285 struct udf_sb_info *sbi = UDF_SB(sb);
1286 int i, type1_idx;
1287 uint16_t partitionNumber;
1288 uint16_t ident;
1289 int ret;
1290
1291 bh = udf_read_tagged(sb, block, block, &ident);
1292 if (!bh)
1293 return -EAGAIN;
1294 if (ident != TAG_IDENT_PD) {
1295 ret = 0;
1296 goto out_bh;
1297 }
1298
1299 p = (struct partitionDesc *)bh->b_data;
1300 partitionNumber = le16_to_cpu(p->partitionNumber);
1301
1302 /* First scan for TYPE1 and SPARABLE partitions */
1303 for (i = 0; i < sbi->s_partitions; i++) {
1304 map = &sbi->s_partmaps[i];
1305 udf_debug("Searching map: (%u == %u)\n",
1306 map->s_partition_num, partitionNumber);
1307 if (map->s_partition_num == partitionNumber &&
1308 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1309 map->s_partition_type == UDF_SPARABLE_MAP15))
1310 break;
1311 }
1312
1313 if (i >= sbi->s_partitions) {
1314 udf_debug("Partition (%u) not found in partition map\n",
1315 partitionNumber);
1316 ret = 0;
1317 goto out_bh;
1318 }
1319
1320 ret = udf_fill_partdesc_info(sb, p, i);
1321 if (ret < 0)
1322 goto out_bh;
1323
1324 /*
1325 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1326 * PHYSICAL partitions are already set up
1327 */
1328 type1_idx = i;
1329 map = NULL; /* supress 'maybe used uninitialized' warning */
1330 for (i = 0; i < sbi->s_partitions; i++) {
1331 map = &sbi->s_partmaps[i];
1332
1333 if (map->s_partition_num == partitionNumber &&
1334 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1335 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1336 map->s_partition_type == UDF_METADATA_MAP25))
1337 break;
1338 }
1339
1340 if (i >= sbi->s_partitions) {
1341 ret = 0;
1342 goto out_bh;
1343 }
1344
1345 ret = udf_fill_partdesc_info(sb, p, i);
1346 if (ret < 0)
1347 goto out_bh;
1348
1349 if (map->s_partition_type == UDF_METADATA_MAP25) {
1350 ret = udf_load_metadata_files(sb, i, type1_idx);
1351 if (ret < 0) {
1352 udf_err(sb, "error loading MetaData partition map %d\n",
1353 i);
1354 goto out_bh;
1355 }
1356 } else {
1357 /*
1358 * If we have a partition with virtual map, we don't handle
1359 * writing to it (we overwrite blocks instead of relocating
1360 * them).
1361 */
1362 if (!sb_rdonly(sb)) {
1363 ret = -EACCES;
1364 goto out_bh;
1365 }
1366 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1367 ret = udf_load_vat(sb, i, type1_idx);
1368 if (ret < 0)
1369 goto out_bh;
1370 }
1371 ret = 0;
1372 out_bh:
1373 /* In case loading failed, we handle cleanup in udf_fill_super */
1374 brelse(bh);
1375 return ret;
1376 }
1377
udf_load_sparable_map(struct super_block * sb,struct udf_part_map * map,struct sparablePartitionMap * spm)1378 static int udf_load_sparable_map(struct super_block *sb,
1379 struct udf_part_map *map,
1380 struct sparablePartitionMap *spm)
1381 {
1382 uint32_t loc;
1383 uint16_t ident;
1384 struct sparingTable *st;
1385 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1386 int i;
1387 struct buffer_head *bh;
1388
1389 map->s_partition_type = UDF_SPARABLE_MAP15;
1390 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1391 if (!is_power_of_2(sdata->s_packet_len)) {
1392 udf_err(sb, "error loading logical volume descriptor: "
1393 "Invalid packet length %u\n",
1394 (unsigned)sdata->s_packet_len);
1395 return -EIO;
1396 }
1397 if (spm->numSparingTables > 4) {
1398 udf_err(sb, "error loading logical volume descriptor: "
1399 "Too many sparing tables (%d)\n",
1400 (int)spm->numSparingTables);
1401 return -EIO;
1402 }
1403 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1404 udf_err(sb, "error loading logical volume descriptor: "
1405 "Too big sparing table size (%u)\n",
1406 le32_to_cpu(spm->sizeSparingTable));
1407 return -EIO;
1408 }
1409
1410 for (i = 0; i < spm->numSparingTables; i++) {
1411 loc = le32_to_cpu(spm->locSparingTable[i]);
1412 bh = udf_read_tagged(sb, loc, loc, &ident);
1413 if (!bh)
1414 continue;
1415
1416 st = (struct sparingTable *)bh->b_data;
1417 if (ident != 0 ||
1418 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1419 strlen(UDF_ID_SPARING)) ||
1420 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1421 sb->s_blocksize) {
1422 brelse(bh);
1423 continue;
1424 }
1425
1426 sdata->s_spar_map[i] = bh;
1427 }
1428 map->s_partition_func = udf_get_pblock_spar15;
1429 return 0;
1430 }
1431
udf_load_logicalvol(struct super_block * sb,sector_t block,struct kernel_lb_addr * fileset)1432 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1433 struct kernel_lb_addr *fileset)
1434 {
1435 struct logicalVolDesc *lvd;
1436 int i, offset;
1437 uint8_t type;
1438 struct udf_sb_info *sbi = UDF_SB(sb);
1439 struct genericPartitionMap *gpm;
1440 uint16_t ident;
1441 struct buffer_head *bh;
1442 unsigned int table_len, part_map_count;
1443 int ret;
1444
1445 bh = udf_read_tagged(sb, block, block, &ident);
1446 if (!bh)
1447 return -EAGAIN;
1448 BUG_ON(ident != TAG_IDENT_LVD);
1449 lvd = (struct logicalVolDesc *)bh->b_data;
1450 table_len = le32_to_cpu(lvd->mapTableLength);
1451 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1452 udf_err(sb, "error loading logical volume descriptor: "
1453 "Partition table too long (%u > %lu)\n", table_len,
1454 sb->s_blocksize - sizeof(*lvd));
1455 ret = -EIO;
1456 goto out_bh;
1457 }
1458
1459 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1460 "logical volume");
1461 if (ret)
1462 goto out_bh;
1463
1464 part_map_count = le32_to_cpu(lvd->numPartitionMaps);
1465 if (part_map_count > table_len / sizeof(struct genericPartitionMap1)) {
1466 udf_err(sb, "error loading logical volume descriptor: "
1467 "Too many partition maps (%u > %u)\n", part_map_count,
1468 table_len / (unsigned)sizeof(struct genericPartitionMap1));
1469 ret = -EIO;
1470 goto out_bh;
1471 }
1472 ret = udf_sb_alloc_partition_maps(sb, part_map_count);
1473 if (ret)
1474 goto out_bh;
1475
1476 for (i = 0, offset = 0;
1477 i < sbi->s_partitions && offset < table_len;
1478 i++, offset += gpm->partitionMapLength) {
1479 struct udf_part_map *map = &sbi->s_partmaps[i];
1480 gpm = (struct genericPartitionMap *)
1481 &(lvd->partitionMaps[offset]);
1482 type = gpm->partitionMapType;
1483 if (type == 1) {
1484 struct genericPartitionMap1 *gpm1 =
1485 (struct genericPartitionMap1 *)gpm;
1486 map->s_partition_type = UDF_TYPE1_MAP15;
1487 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1488 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1489 map->s_partition_func = NULL;
1490 } else if (type == 2) {
1491 struct udfPartitionMap2 *upm2 =
1492 (struct udfPartitionMap2 *)gpm;
1493 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1494 strlen(UDF_ID_VIRTUAL))) {
1495 u16 suf =
1496 le16_to_cpu(((__le16 *)upm2->partIdent.
1497 identSuffix)[0]);
1498 if (suf < 0x0200) {
1499 map->s_partition_type =
1500 UDF_VIRTUAL_MAP15;
1501 map->s_partition_func =
1502 udf_get_pblock_virt15;
1503 } else {
1504 map->s_partition_type =
1505 UDF_VIRTUAL_MAP20;
1506 map->s_partition_func =
1507 udf_get_pblock_virt20;
1508 }
1509 } else if (!strncmp(upm2->partIdent.ident,
1510 UDF_ID_SPARABLE,
1511 strlen(UDF_ID_SPARABLE))) {
1512 ret = udf_load_sparable_map(sb, map,
1513 (struct sparablePartitionMap *)gpm);
1514 if (ret < 0)
1515 goto out_bh;
1516 } else if (!strncmp(upm2->partIdent.ident,
1517 UDF_ID_METADATA,
1518 strlen(UDF_ID_METADATA))) {
1519 struct udf_meta_data *mdata =
1520 &map->s_type_specific.s_metadata;
1521 struct metadataPartitionMap *mdm =
1522 (struct metadataPartitionMap *)
1523 &(lvd->partitionMaps[offset]);
1524 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
1525 i, type, UDF_ID_METADATA);
1526
1527 map->s_partition_type = UDF_METADATA_MAP25;
1528 map->s_partition_func = udf_get_pblock_meta25;
1529
1530 mdata->s_meta_file_loc =
1531 le32_to_cpu(mdm->metadataFileLoc);
1532 mdata->s_mirror_file_loc =
1533 le32_to_cpu(mdm->metadataMirrorFileLoc);
1534 mdata->s_bitmap_file_loc =
1535 le32_to_cpu(mdm->metadataBitmapFileLoc);
1536 mdata->s_alloc_unit_size =
1537 le32_to_cpu(mdm->allocUnitSize);
1538 mdata->s_align_unit_size =
1539 le16_to_cpu(mdm->alignUnitSize);
1540 if (mdm->flags & 0x01)
1541 mdata->s_flags |= MF_DUPLICATE_MD;
1542
1543 udf_debug("Metadata Ident suffix=0x%x\n",
1544 le16_to_cpu(*(__le16 *)
1545 mdm->partIdent.identSuffix));
1546 udf_debug("Metadata part num=%u\n",
1547 le16_to_cpu(mdm->partitionNum));
1548 udf_debug("Metadata part alloc unit size=%u\n",
1549 le32_to_cpu(mdm->allocUnitSize));
1550 udf_debug("Metadata file loc=%u\n",
1551 le32_to_cpu(mdm->metadataFileLoc));
1552 udf_debug("Mirror file loc=%u\n",
1553 le32_to_cpu(mdm->metadataMirrorFileLoc));
1554 udf_debug("Bitmap file loc=%u\n",
1555 le32_to_cpu(mdm->metadataBitmapFileLoc));
1556 udf_debug("Flags: %d %u\n",
1557 mdata->s_flags, mdm->flags);
1558 } else {
1559 udf_debug("Unknown ident: %s\n",
1560 upm2->partIdent.ident);
1561 continue;
1562 }
1563 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1564 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1565 }
1566 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1567 i, map->s_partition_num, type, map->s_volumeseqnum);
1568 }
1569
1570 if (fileset) {
1571 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1572
1573 *fileset = lelb_to_cpu(la->extLocation);
1574 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1575 fileset->logicalBlockNum,
1576 fileset->partitionReferenceNum);
1577 }
1578 if (lvd->integritySeqExt.extLength)
1579 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1580 ret = 0;
1581
1582 if (!sbi->s_lvid_bh) {
1583 /* We can't generate unique IDs without a valid LVID */
1584 if (sb_rdonly(sb)) {
1585 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1586 } else {
1587 udf_warn(sb, "Damaged or missing LVID, forcing "
1588 "readonly mount\n");
1589 ret = -EACCES;
1590 }
1591 }
1592 out_bh:
1593 brelse(bh);
1594 return ret;
1595 }
1596
udf_lvid_valid(struct super_block * sb,struct logicalVolIntegrityDesc * lvid)1597 static bool udf_lvid_valid(struct super_block *sb,
1598 struct logicalVolIntegrityDesc *lvid)
1599 {
1600 u32 parts, impuselen;
1601
1602 parts = le32_to_cpu(lvid->numOfPartitions);
1603 impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1604 if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1605 sizeof(struct logicalVolIntegrityDesc) + impuselen +
1606 2 * parts * sizeof(u32) > sb->s_blocksize)
1607 return false;
1608 return true;
1609 }
1610
1611 /*
1612 * Find the prevailing Logical Volume Integrity Descriptor.
1613 */
udf_load_logicalvolint(struct super_block * sb,struct kernel_extent_ad loc)1614 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1615 {
1616 struct buffer_head *bh, *final_bh;
1617 uint16_t ident;
1618 struct udf_sb_info *sbi = UDF_SB(sb);
1619 struct logicalVolIntegrityDesc *lvid;
1620 int indirections = 0;
1621
1622 while (++indirections <= UDF_MAX_LVID_NESTING) {
1623 final_bh = NULL;
1624 while (loc.extLength > 0 &&
1625 (bh = udf_read_tagged(sb, loc.extLocation,
1626 loc.extLocation, &ident))) {
1627 if (ident != TAG_IDENT_LVID) {
1628 brelse(bh);
1629 break;
1630 }
1631
1632 brelse(final_bh);
1633 final_bh = bh;
1634
1635 loc.extLength -= sb->s_blocksize;
1636 loc.extLocation++;
1637 }
1638
1639 if (!final_bh)
1640 return;
1641
1642 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1643 if (udf_lvid_valid(sb, lvid)) {
1644 brelse(sbi->s_lvid_bh);
1645 sbi->s_lvid_bh = final_bh;
1646 } else {
1647 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1648 "ignoring.\n",
1649 le32_to_cpu(lvid->numOfPartitions),
1650 le32_to_cpu(lvid->lengthOfImpUse));
1651 }
1652
1653 if (lvid->nextIntegrityExt.extLength == 0)
1654 return;
1655
1656 loc = leea_to_cpu(lvid->nextIntegrityExt);
1657 }
1658
1659 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1660 UDF_MAX_LVID_NESTING);
1661 brelse(sbi->s_lvid_bh);
1662 sbi->s_lvid_bh = NULL;
1663 }
1664
1665 /*
1666 * Step for reallocation of table of partition descriptor sequence numbers.
1667 * Must be power of 2.
1668 */
1669 #define PART_DESC_ALLOC_STEP 32
1670
1671 struct part_desc_seq_scan_data {
1672 struct udf_vds_record rec;
1673 u32 partnum;
1674 };
1675
1676 struct desc_seq_scan_data {
1677 struct udf_vds_record vds[VDS_POS_LENGTH];
1678 unsigned int size_part_descs;
1679 unsigned int num_part_descs;
1680 struct part_desc_seq_scan_data *part_descs_loc;
1681 };
1682
handle_partition_descriptor(struct buffer_head * bh,struct desc_seq_scan_data * data)1683 static struct udf_vds_record *handle_partition_descriptor(
1684 struct buffer_head *bh,
1685 struct desc_seq_scan_data *data)
1686 {
1687 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1688 int partnum;
1689 int i;
1690
1691 partnum = le16_to_cpu(desc->partitionNumber);
1692 for (i = 0; i < data->num_part_descs; i++)
1693 if (partnum == data->part_descs_loc[i].partnum)
1694 return &(data->part_descs_loc[i].rec);
1695 if (data->num_part_descs >= data->size_part_descs) {
1696 struct part_desc_seq_scan_data *new_loc;
1697 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1698
1699 new_loc = kzalloc_objs(*new_loc, new_size);
1700 if (!new_loc)
1701 return ERR_PTR(-ENOMEM);
1702 memcpy(new_loc, data->part_descs_loc,
1703 data->size_part_descs * sizeof(*new_loc));
1704 kfree(data->part_descs_loc);
1705 data->part_descs_loc = new_loc;
1706 data->size_part_descs = new_size;
1707 }
1708 return &(data->part_descs_loc[data->num_part_descs++].rec);
1709 }
1710
1711
get_volume_descriptor_record(uint16_t ident,struct buffer_head * bh,struct desc_seq_scan_data * data)1712 static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1713 struct buffer_head *bh, struct desc_seq_scan_data *data)
1714 {
1715 switch (ident) {
1716 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1717 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1718 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1719 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1720 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1721 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1722 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1723 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1724 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1725 return handle_partition_descriptor(bh, data);
1726 }
1727 return NULL;
1728 }
1729
1730 /*
1731 * Process a main/reserve volume descriptor sequence.
1732 * @block First block of first extent of the sequence.
1733 * @lastblock Lastblock of first extent of the sequence.
1734 * @fileset There we store extent containing root fileset
1735 *
1736 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1737 * sequence
1738 */
udf_process_sequence(struct super_block * sb,sector_t block,sector_t lastblock,struct kernel_lb_addr * fileset)1739 static noinline int udf_process_sequence(
1740 struct super_block *sb,
1741 sector_t block, sector_t lastblock,
1742 struct kernel_lb_addr *fileset)
1743 {
1744 struct buffer_head *bh = NULL;
1745 struct udf_vds_record *curr;
1746 struct generic_desc *gd;
1747 struct volDescPtr *vdp;
1748 bool done = false;
1749 uint32_t vdsn;
1750 uint16_t ident;
1751 int ret;
1752 unsigned int indirections = 0;
1753 struct desc_seq_scan_data data;
1754 unsigned int i;
1755
1756 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1757 data.size_part_descs = PART_DESC_ALLOC_STEP;
1758 data.num_part_descs = 0;
1759 data.part_descs_loc = kzalloc_objs(*data.part_descs_loc,
1760 data.size_part_descs);
1761 if (!data.part_descs_loc)
1762 return -ENOMEM;
1763
1764 /*
1765 * Read the main descriptor sequence and find which descriptors
1766 * are in it.
1767 */
1768 for (; (!done && block <= lastblock); block++) {
1769 bh = udf_read_tagged(sb, block, block, &ident);
1770 if (!bh)
1771 break;
1772
1773 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1774 gd = (struct generic_desc *)bh->b_data;
1775 vdsn = le32_to_cpu(gd->volDescSeqNum);
1776 switch (ident) {
1777 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1778 if (++indirections > UDF_MAX_TD_NESTING) {
1779 udf_err(sb, "too many Volume Descriptor "
1780 "Pointers (max %u supported)\n",
1781 UDF_MAX_TD_NESTING);
1782 brelse(bh);
1783 ret = -EIO;
1784 goto out;
1785 }
1786
1787 vdp = (struct volDescPtr *)bh->b_data;
1788 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1789 lastblock = le32_to_cpu(
1790 vdp->nextVolDescSeqExt.extLength) >>
1791 sb->s_blocksize_bits;
1792 lastblock += block - 1;
1793 /* For loop is going to increment 'block' again */
1794 block--;
1795 break;
1796 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1797 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1798 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1799 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1800 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1801 curr = get_volume_descriptor_record(ident, bh, &data);
1802 if (IS_ERR(curr)) {
1803 brelse(bh);
1804 ret = PTR_ERR(curr);
1805 goto out;
1806 }
1807 /* Descriptor we don't care about? */
1808 if (!curr)
1809 break;
1810 if (vdsn >= curr->volDescSeqNum) {
1811 curr->volDescSeqNum = vdsn;
1812 curr->block = block;
1813 }
1814 break;
1815 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1816 done = true;
1817 break;
1818 }
1819 brelse(bh);
1820 }
1821 /*
1822 * Now read interesting descriptors again and process them
1823 * in a suitable order
1824 */
1825 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1826 udf_err(sb, "Primary Volume Descriptor not found!\n");
1827 ret = -EAGAIN;
1828 goto out;
1829 }
1830 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1831 if (ret < 0)
1832 goto out;
1833
1834 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1835 ret = udf_load_logicalvol(sb,
1836 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1837 fileset);
1838 if (ret < 0)
1839 goto out;
1840 }
1841
1842 /* Now handle prevailing Partition Descriptors */
1843 for (i = 0; i < data.num_part_descs; i++) {
1844 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1845 if (ret < 0)
1846 goto out;
1847 }
1848 ret = 0;
1849 out:
1850 kfree(data.part_descs_loc);
1851 return ret;
1852 }
1853
1854 /*
1855 * Load Volume Descriptor Sequence described by anchor in bh
1856 *
1857 * Returns <0 on error, 0 on success
1858 */
udf_load_sequence(struct super_block * sb,struct buffer_head * bh,struct kernel_lb_addr * fileset)1859 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1860 struct kernel_lb_addr *fileset)
1861 {
1862 struct anchorVolDescPtr *anchor;
1863 sector_t main_s, main_e, reserve_s, reserve_e;
1864 int ret;
1865
1866 anchor = (struct anchorVolDescPtr *)bh->b_data;
1867
1868 /* Locate the main sequence */
1869 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1870 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1871 main_e = main_e >> sb->s_blocksize_bits;
1872 main_e += main_s - 1;
1873
1874 /* Locate the reserve sequence */
1875 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1876 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1877 reserve_e = reserve_e >> sb->s_blocksize_bits;
1878 reserve_e += reserve_s - 1;
1879
1880 /* Process the main & reserve sequences */
1881 /* responsible for finding the PartitionDesc(s) */
1882 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1883 if (ret != -EAGAIN)
1884 return ret;
1885 udf_sb_free_partitions(sb);
1886 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1887 if (ret < 0) {
1888 udf_sb_free_partitions(sb);
1889 /* No sequence was OK, return -EIO */
1890 if (ret == -EAGAIN)
1891 ret = -EIO;
1892 }
1893 return ret;
1894 }
1895
1896 /*
1897 * Check whether there is an anchor block in the given block and
1898 * load Volume Descriptor Sequence if so.
1899 *
1900 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1901 * block
1902 */
udf_check_anchor_block(struct super_block * sb,sector_t block,struct kernel_lb_addr * fileset)1903 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1904 struct kernel_lb_addr *fileset)
1905 {
1906 struct buffer_head *bh;
1907 uint16_t ident;
1908 int ret;
1909
1910 bh = udf_read_tagged(sb, block, block, &ident);
1911 if (!bh)
1912 return -EAGAIN;
1913 if (ident != TAG_IDENT_AVDP) {
1914 brelse(bh);
1915 return -EAGAIN;
1916 }
1917 ret = udf_load_sequence(sb, bh, fileset);
1918 brelse(bh);
1919 return ret;
1920 }
1921
1922 /*
1923 * Search for an anchor volume descriptor pointer.
1924 *
1925 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1926 * of anchors.
1927 */
udf_scan_anchors(struct super_block * sb,udf_pblk_t * lastblock,struct kernel_lb_addr * fileset)1928 static int udf_scan_anchors(struct super_block *sb, udf_pblk_t *lastblock,
1929 struct kernel_lb_addr *fileset)
1930 {
1931 udf_pblk_t last[6];
1932 int i;
1933 struct udf_sb_info *sbi = UDF_SB(sb);
1934 int last_count = 0;
1935 int ret;
1936
1937 /* First try user provided anchor */
1938 if (sbi->s_anchor) {
1939 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1940 if (ret != -EAGAIN)
1941 return ret;
1942 }
1943 /*
1944 * according to spec, anchor is in either:
1945 * block 256
1946 * lastblock-256
1947 * lastblock
1948 * however, if the disc isn't closed, it could be 512.
1949 */
1950 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1951 if (ret != -EAGAIN)
1952 return ret;
1953 /*
1954 * The trouble is which block is the last one. Drives often misreport
1955 * this so we try various possibilities.
1956 */
1957 last[last_count++] = *lastblock;
1958 if (*lastblock >= 1)
1959 last[last_count++] = *lastblock - 1;
1960 last[last_count++] = *lastblock + 1;
1961 if (*lastblock >= 2)
1962 last[last_count++] = *lastblock - 2;
1963 if (*lastblock >= 150)
1964 last[last_count++] = *lastblock - 150;
1965 if (*lastblock >= 152)
1966 last[last_count++] = *lastblock - 152;
1967
1968 for (i = 0; i < last_count; i++) {
1969 if (last[i] >= sb_bdev_nr_blocks(sb))
1970 continue;
1971 ret = udf_check_anchor_block(sb, last[i], fileset);
1972 if (ret != -EAGAIN) {
1973 if (!ret)
1974 *lastblock = last[i];
1975 return ret;
1976 }
1977 if (last[i] < 256)
1978 continue;
1979 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1980 if (ret != -EAGAIN) {
1981 if (!ret)
1982 *lastblock = last[i];
1983 return ret;
1984 }
1985 }
1986
1987 /* Finally try block 512 in case media is open */
1988 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1989 }
1990
1991 /*
1992 * Check Volume Structure Descriptor, find Anchor block and load Volume
1993 * Descriptor Sequence.
1994 *
1995 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1996 * block was not found.
1997 */
udf_load_vrs(struct super_block * sb,struct udf_options * uopt,int silent,struct kernel_lb_addr * fileset)1998 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1999 int silent, struct kernel_lb_addr *fileset)
2000 {
2001 struct udf_sb_info *sbi = UDF_SB(sb);
2002 int nsr = 0;
2003 int ret;
2004
2005 if (!sb_set_blocksize(sb, uopt->blocksize)) {
2006 if (!silent)
2007 udf_warn(sb, "Bad block size\n");
2008 return -EINVAL;
2009 }
2010 sbi->s_last_block = uopt->lastblock;
2011 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_NOVRS)) {
2012 /* Check that it is NSR02 compliant */
2013 nsr = udf_check_vsd(sb);
2014 if (!nsr) {
2015 if (!silent)
2016 udf_warn(sb, "No VRS found\n");
2017 return -EINVAL;
2018 }
2019 if (nsr == -1)
2020 udf_debug("Failed to read sector at offset %d. "
2021 "Assuming open disc. Skipping validity "
2022 "check\n", VSD_FIRST_SECTOR_OFFSET);
2023 if (!sbi->s_last_block)
2024 sbi->s_last_block = udf_get_last_block(sb);
2025 } else {
2026 udf_debug("Validity check skipped because of novrs option\n");
2027 }
2028
2029 /* Look for anchor block and load Volume Descriptor Sequence */
2030 sbi->s_anchor = uopt->anchor;
2031 ret = udf_scan_anchors(sb, &sbi->s_last_block, fileset);
2032 if (ret < 0) {
2033 if (!silent && ret == -EAGAIN)
2034 udf_warn(sb, "No anchor found\n");
2035 return ret;
2036 }
2037 return 0;
2038 }
2039
udf_finalize_lvid(struct logicalVolIntegrityDesc * lvid)2040 static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2041 {
2042 struct timespec64 ts;
2043
2044 ktime_get_real_ts64(&ts);
2045 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2046 lvid->descTag.descCRC = cpu_to_le16(
2047 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2048 le16_to_cpu(lvid->descTag.descCRCLength)));
2049 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2050 }
2051
udf_open_lvid(struct super_block * sb)2052 static void udf_open_lvid(struct super_block *sb)
2053 {
2054 struct udf_sb_info *sbi = UDF_SB(sb);
2055 struct buffer_head *bh = sbi->s_lvid_bh;
2056 struct logicalVolIntegrityDesc *lvid;
2057 struct logicalVolIntegrityDescImpUse *lvidiu;
2058
2059 if (!bh)
2060 return;
2061 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2062 lvidiu = udf_sb_lvidiu(sb);
2063 if (!lvidiu)
2064 return;
2065
2066 mutex_lock(&sbi->s_alloc_mutex);
2067 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2068 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2069 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2070 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2071 else
2072 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2073
2074 udf_finalize_lvid(lvid);
2075 mark_buffer_dirty(bh);
2076 sbi->s_lvid_dirty = 0;
2077 mutex_unlock(&sbi->s_alloc_mutex);
2078 /* Make opening of filesystem visible on the media immediately */
2079 sync_dirty_buffer(bh);
2080 }
2081
udf_close_lvid(struct super_block * sb)2082 static void udf_close_lvid(struct super_block *sb)
2083 {
2084 struct udf_sb_info *sbi = UDF_SB(sb);
2085 struct buffer_head *bh = sbi->s_lvid_bh;
2086 struct logicalVolIntegrityDesc *lvid;
2087 struct logicalVolIntegrityDescImpUse *lvidiu;
2088
2089 if (!bh)
2090 return;
2091 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2092 lvidiu = udf_sb_lvidiu(sb);
2093 if (!lvidiu)
2094 return;
2095
2096 mutex_lock(&sbi->s_alloc_mutex);
2097 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2098 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2099 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2100 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2101 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2102 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2103 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2104 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2105 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2106 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2107
2108 /*
2109 * We set buffer uptodate unconditionally here to avoid spurious
2110 * warnings from mark_buffer_dirty() when previous EIO has marked
2111 * the buffer as !uptodate
2112 */
2113 set_buffer_uptodate(bh);
2114 udf_finalize_lvid(lvid);
2115 mark_buffer_dirty(bh);
2116 sbi->s_lvid_dirty = 0;
2117 mutex_unlock(&sbi->s_alloc_mutex);
2118 /* Make closing of filesystem visible on the media immediately */
2119 sync_dirty_buffer(bh);
2120 }
2121
lvid_get_unique_id(struct super_block * sb)2122 u64 lvid_get_unique_id(struct super_block *sb)
2123 {
2124 struct buffer_head *bh;
2125 struct udf_sb_info *sbi = UDF_SB(sb);
2126 struct logicalVolIntegrityDesc *lvid;
2127 struct logicalVolHeaderDesc *lvhd;
2128 u64 uniqueID;
2129 u64 ret;
2130
2131 bh = sbi->s_lvid_bh;
2132 if (!bh)
2133 return 0;
2134
2135 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2136 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2137
2138 mutex_lock(&sbi->s_alloc_mutex);
2139 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2140 if (!(++uniqueID & 0xFFFFFFFF))
2141 uniqueID += 16;
2142 lvhd->uniqueID = cpu_to_le64(uniqueID);
2143 udf_updated_lvid(sb);
2144 mutex_unlock(&sbi->s_alloc_mutex);
2145
2146 return ret;
2147 }
2148
udf_fill_super(struct super_block * sb,struct fs_context * fc)2149 static int udf_fill_super(struct super_block *sb, struct fs_context *fc)
2150 {
2151 int ret = -EINVAL;
2152 struct inode *inode = NULL;
2153 struct udf_options *uopt = fc->fs_private;
2154 struct kernel_lb_addr rootdir, fileset;
2155 struct udf_sb_info *sbi;
2156 bool lvid_open = false;
2157 int silent = fc->sb_flags & SB_SILENT;
2158
2159 sbi = kzalloc_obj(*sbi);
2160 if (!sbi)
2161 return -ENOMEM;
2162
2163 sb->s_fs_info = sbi;
2164
2165 mutex_init(&sbi->s_alloc_mutex);
2166
2167 fileset.logicalBlockNum = 0xFFFFFFFF;
2168 fileset.partitionReferenceNum = 0xFFFF;
2169
2170 sbi->s_flags = uopt->flags;
2171 sbi->s_uid = uopt->uid;
2172 sbi->s_gid = uopt->gid;
2173 sbi->s_umask = uopt->umask;
2174 sbi->s_fmode = uopt->fmode;
2175 sbi->s_dmode = uopt->dmode;
2176 sbi->s_nls_map = uopt->nls_map;
2177 uopt->nls_map = NULL;
2178 rwlock_init(&sbi->s_cred_lock);
2179
2180 if (uopt->session == 0xFFFFFFFF)
2181 sbi->s_session = udf_get_last_session(sb);
2182 else
2183 sbi->s_session = uopt->session;
2184
2185 udf_debug("Multi-session=%d\n", sbi->s_session);
2186
2187 /* Fill in the rest of the superblock */
2188 sb->s_op = &udf_sb_ops;
2189 sb->s_export_op = &udf_export_ops;
2190
2191 sb->s_magic = UDF_SUPER_MAGIC;
2192 sb->s_time_gran = 1000;
2193
2194 if (uopt->flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2195 ret = udf_load_vrs(sb, uopt, silent, &fileset);
2196 } else {
2197 uopt->blocksize = bdev_logical_block_size(sb->s_bdev);
2198 while (uopt->blocksize <= 4096) {
2199 ret = udf_load_vrs(sb, uopt, silent, &fileset);
2200 if (ret < 0) {
2201 if (!silent && ret != -EACCES) {
2202 pr_notice("Scanning with blocksize %u failed\n",
2203 uopt->blocksize);
2204 }
2205 brelse(sbi->s_lvid_bh);
2206 sbi->s_lvid_bh = NULL;
2207 /*
2208 * EACCES is special - we want to propagate to
2209 * upper layers that we cannot handle RW mount.
2210 */
2211 if (ret == -EACCES)
2212 break;
2213 } else
2214 break;
2215
2216 uopt->blocksize <<= 1;
2217 }
2218 }
2219 if (ret < 0) {
2220 if (ret == -EAGAIN) {
2221 udf_warn(sb, "No partition found (1)\n");
2222 ret = -EINVAL;
2223 }
2224 goto error_out;
2225 }
2226
2227 udf_debug("Lastblock=%u\n", sbi->s_last_block);
2228
2229 if (sbi->s_lvid_bh) {
2230 struct logicalVolIntegrityDescImpUse *lvidiu =
2231 udf_sb_lvidiu(sb);
2232 uint16_t minUDFReadRev;
2233 uint16_t minUDFWriteRev;
2234
2235 if (!lvidiu) {
2236 ret = -EINVAL;
2237 goto error_out;
2238 }
2239 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2240 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2241 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2242 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2243 minUDFReadRev,
2244 UDF_MAX_READ_VERSION);
2245 ret = -EINVAL;
2246 goto error_out;
2247 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2248 if (!sb_rdonly(sb)) {
2249 ret = -EACCES;
2250 goto error_out;
2251 }
2252 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2253 }
2254
2255 sbi->s_udfrev = minUDFWriteRev;
2256
2257 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2258 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2259 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2260 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2261 }
2262
2263 if (!sbi->s_partitions) {
2264 udf_warn(sb, "No partition found (2)\n");
2265 ret = -EINVAL;
2266 goto error_out;
2267 }
2268
2269 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2270 UDF_PART_FLAG_READ_ONLY) {
2271 if (!sb_rdonly(sb)) {
2272 ret = -EACCES;
2273 goto error_out;
2274 }
2275 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2276 }
2277
2278 ret = udf_find_fileset(sb, &fileset, &rootdir);
2279 if (ret < 0) {
2280 udf_warn(sb, "No fileset found\n");
2281 goto error_out;
2282 }
2283
2284 if (!silent) {
2285 struct timestamp ts;
2286 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2287 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2288 sbi->s_volume_ident,
2289 le16_to_cpu(ts.year), ts.month, ts.day,
2290 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2291 }
2292 if (!sb_rdonly(sb)) {
2293 udf_open_lvid(sb);
2294 lvid_open = true;
2295 }
2296
2297 /* Assign the root inode */
2298 /* assign inodes by physical block number */
2299 /* perhaps it's not extensible enough, but for now ... */
2300 inode = udf_iget(sb, &rootdir);
2301 if (IS_ERR(inode)) {
2302 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2303 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2304 ret = PTR_ERR(inode);
2305 goto error_out;
2306 }
2307
2308 /* Allocate a dentry for the root inode */
2309 sb->s_root = d_make_root(inode);
2310 if (!sb->s_root) {
2311 udf_err(sb, "Couldn't allocate root dentry\n");
2312 ret = -ENOMEM;
2313 goto error_out;
2314 }
2315 sb->s_maxbytes = UDF_MAX_FILESIZE;
2316 sb->s_max_links = UDF_MAX_LINKS;
2317 return 0;
2318
2319 error_out:
2320 iput(sbi->s_vat_inode);
2321 unload_nls(uopt->nls_map);
2322 if (lvid_open)
2323 udf_close_lvid(sb);
2324 brelse(sbi->s_lvid_bh);
2325 udf_sb_free_partitions(sb);
2326 kfree(sbi);
2327 sb->s_fs_info = NULL;
2328
2329 return ret;
2330 }
2331
_udf_err(struct super_block * sb,const char * function,const char * fmt,...)2332 void _udf_err(struct super_block *sb, const char *function,
2333 const char *fmt, ...)
2334 {
2335 struct va_format vaf;
2336 va_list args;
2337
2338 va_start(args, fmt);
2339
2340 vaf.fmt = fmt;
2341 vaf.va = &args;
2342
2343 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2344
2345 va_end(args);
2346 }
2347
_udf_warn(struct super_block * sb,const char * function,const char * fmt,...)2348 void _udf_warn(struct super_block *sb, const char *function,
2349 const char *fmt, ...)
2350 {
2351 struct va_format vaf;
2352 va_list args;
2353
2354 va_start(args, fmt);
2355
2356 vaf.fmt = fmt;
2357 vaf.va = &args;
2358
2359 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2360
2361 va_end(args);
2362 }
2363
udf_put_super(struct super_block * sb)2364 static void udf_put_super(struct super_block *sb)
2365 {
2366 struct udf_sb_info *sbi;
2367
2368 sbi = UDF_SB(sb);
2369
2370 iput(sbi->s_vat_inode);
2371 unload_nls(sbi->s_nls_map);
2372 if (!sb_rdonly(sb))
2373 udf_close_lvid(sb);
2374 brelse(sbi->s_lvid_bh);
2375 udf_sb_free_partitions(sb);
2376 mutex_destroy(&sbi->s_alloc_mutex);
2377 kfree(sb->s_fs_info);
2378 sb->s_fs_info = NULL;
2379 }
2380
udf_sync_fs(struct super_block * sb,int wait)2381 static int udf_sync_fs(struct super_block *sb, int wait)
2382 {
2383 struct udf_sb_info *sbi = UDF_SB(sb);
2384
2385 mutex_lock(&sbi->s_alloc_mutex);
2386 if (sbi->s_lvid_dirty) {
2387 struct buffer_head *bh = sbi->s_lvid_bh;
2388 struct logicalVolIntegrityDesc *lvid;
2389
2390 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2391 udf_finalize_lvid(lvid);
2392
2393 /*
2394 * Blockdevice will be synced later so we don't have to submit
2395 * the buffer for IO
2396 */
2397 mark_buffer_dirty(bh);
2398 sbi->s_lvid_dirty = 0;
2399 }
2400 mutex_unlock(&sbi->s_alloc_mutex);
2401
2402 return 0;
2403 }
2404
udf_statfs(struct dentry * dentry,struct kstatfs * buf)2405 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2406 {
2407 struct super_block *sb = dentry->d_sb;
2408 struct udf_sb_info *sbi = UDF_SB(sb);
2409 struct logicalVolIntegrityDescImpUse *lvidiu;
2410 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2411
2412 lvidiu = udf_sb_lvidiu(sb);
2413 buf->f_type = UDF_SUPER_MAGIC;
2414 buf->f_bsize = sb->s_blocksize;
2415 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2416 buf->f_bfree = udf_count_free(sb);
2417 buf->f_bavail = buf->f_bfree;
2418 /*
2419 * Let's pretend each free block is also a free 'inode' since UDF does
2420 * not have separate preallocated table of inodes.
2421 */
2422 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2423 le32_to_cpu(lvidiu->numDirs)) : 0)
2424 + buf->f_bfree;
2425 buf->f_ffree = buf->f_bfree;
2426 buf->f_namelen = UDF_NAME_LEN;
2427 buf->f_fsid = u64_to_fsid(id);
2428
2429 return 0;
2430 }
2431
udf_count_free_bitmap(struct super_block * sb,struct udf_bitmap * bitmap)2432 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2433 struct udf_bitmap *bitmap)
2434 {
2435 struct buffer_head *bh = NULL;
2436 unsigned int accum = 0;
2437 int index;
2438 udf_pblk_t block = 0, newblock;
2439 struct kernel_lb_addr loc;
2440 uint32_t bytes;
2441 uint8_t *ptr;
2442 uint16_t ident;
2443 struct spaceBitmapDesc *bm;
2444
2445 loc.logicalBlockNum = bitmap->s_extPosition;
2446 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2447 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2448
2449 if (!bh) {
2450 udf_err(sb, "udf_count_free failed\n");
2451 goto out;
2452 } else if (ident != TAG_IDENT_SBD) {
2453 brelse(bh);
2454 udf_err(sb, "udf_count_free failed\n");
2455 goto out;
2456 }
2457
2458 bm = (struct spaceBitmapDesc *)bh->b_data;
2459 bytes = le32_to_cpu(bm->numOfBytes);
2460 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2461 ptr = (uint8_t *)bh->b_data;
2462
2463 while (bytes > 0) {
2464 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2465 accum += bitmap_weight((const unsigned long *)(ptr + index),
2466 cur_bytes * 8);
2467 bytes -= cur_bytes;
2468 if (bytes) {
2469 brelse(bh);
2470 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2471 bh = sb_bread(sb, newblock);
2472 if (!bh) {
2473 udf_debug("read failed\n");
2474 goto out;
2475 }
2476 index = 0;
2477 ptr = (uint8_t *)bh->b_data;
2478 }
2479 }
2480 brelse(bh);
2481 out:
2482 return accum;
2483 }
2484
udf_count_free_table(struct super_block * sb,struct inode * table)2485 static unsigned int udf_count_free_table(struct super_block *sb,
2486 struct inode *table)
2487 {
2488 unsigned int accum = 0;
2489 uint32_t elen;
2490 struct kernel_lb_addr eloc;
2491 struct extent_position epos;
2492 int8_t etype;
2493
2494 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2495 epos.block = UDF_I(table)->i_location;
2496 epos.offset = sizeof(struct unallocSpaceEntry);
2497 epos.bh = NULL;
2498
2499 while (udf_next_aext(table, &epos, &eloc, &elen, &etype, 1) > 0)
2500 accum += (elen >> table->i_sb->s_blocksize_bits);
2501
2502 brelse(epos.bh);
2503 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2504
2505 return accum;
2506 }
2507
udf_count_free(struct super_block * sb)2508 static unsigned int udf_count_free(struct super_block *sb)
2509 {
2510 unsigned int accum = 0;
2511 struct udf_sb_info *sbi = UDF_SB(sb);
2512 struct udf_part_map *map;
2513 unsigned int part = sbi->s_partition;
2514 int ptype = sbi->s_partmaps[part].s_partition_type;
2515
2516 if (ptype == UDF_METADATA_MAP25) {
2517 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2518 s_phys_partition_ref;
2519 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2520 /*
2521 * Filesystems with VAT are append-only and we cannot write to
2522 * them. Let's just report 0 here.
2523 */
2524 return 0;
2525 }
2526
2527 if (sbi->s_lvid_bh) {
2528 struct logicalVolIntegrityDesc *lvid =
2529 (struct logicalVolIntegrityDesc *)
2530 sbi->s_lvid_bh->b_data;
2531 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2532 accum = le32_to_cpu(
2533 lvid->freeSpaceTable[part]);
2534 if (accum == 0xFFFFFFFF)
2535 accum = 0;
2536 }
2537 }
2538
2539 if (accum)
2540 return accum;
2541
2542 map = &sbi->s_partmaps[part];
2543 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2544 accum += udf_count_free_bitmap(sb,
2545 map->s_uspace.s_bitmap);
2546 }
2547 if (accum)
2548 return accum;
2549
2550 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2551 accum += udf_count_free_table(sb,
2552 map->s_uspace.s_table);
2553 }
2554 return accum;
2555 }
2556
2557 MODULE_AUTHOR("Ben Fennema");
2558 MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2559 MODULE_LICENSE("GPL");
2560 module_init(init_udf_fs)
2561 module_exit(exit_udf_fs)
2562