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