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1/*
2 * super.c
3 *
4 * PURPOSE
5 * Super block routines for the OSTA-UDF(tm) filesystem.
6 *
7 * DESCRIPTION
8 * OSTA-UDF(tm) = Optical Storage Technology Association
9 * Universal Disk Format.
10 *
11 * This code is based on version 2.00 of the UDF specification,
12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13 * http://www.osta.org/
14 * https://www.ecma.ch/
15 * https://www.iso.org/
16 *
17 * COPYRIGHT
18 * This file is distributed under the terms of the GNU General Public
19 * License (GPL). Copies of the GPL can be obtained from:
20 * ftp://prep.ai.mit.edu/pub/gnu/GPL
21 * Each contributing author retains all rights to their own work.
22 *
23 * (C) 1998 Dave Boynton
24 * (C) 1998-2004 Ben Fennema
25 * (C) 2000 Stelias Computing Inc
26 *
27 * HISTORY
28 *
29 * 09/24/98 dgb changed to allow compiling outside of kernel, and
30 * added some debugging.
31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
32 * 10/16/98 attempting some multi-session support
33 * 10/17/98 added freespace count for "df"
34 * 11/11/98 gr added novrs option
35 * 11/26/98 dgb added fileset,anchor mount options
36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
41#include "udfdecl.h"
42
43#include <linux/blkdev.h>
44#include <linux/slab.h>
45#include <linux/kernel.h>
46#include <linux/module.h>
47#include <linux/parser.h>
48#include <linux/stat.h>
49#include <linux/cdrom.h>
50#include <linux/nls.h>
51#include <linux/vfs.h>
52#include <linux/vmalloc.h>
53#include <linux/errno.h>
54#include <linux/mount.h>
55#include <linux/seq_file.h>
56#include <linux/bitmap.h>
57#include <linux/crc-itu-t.h>
58#include <linux/log2.h>
59#include <asm/byteorder.h>
60
61#include "udf_sb.h"
62#include "udf_i.h"
63
64#include <linux/init.h>
65#include <linux/uaccess.h>
66
67enum {
68 VDS_POS_PRIMARY_VOL_DESC,
69 VDS_POS_UNALLOC_SPACE_DESC,
70 VDS_POS_LOGICAL_VOL_DESC,
71 VDS_POS_IMP_USE_VOL_DESC,
72 VDS_POS_LENGTH
73};
74
75#define VSD_FIRST_SECTOR_OFFSET 32768
76#define VSD_MAX_SECTOR_OFFSET 0x800000
77
78/*
79 * Maximum number of Terminating Descriptor / Logical Volume Integrity
80 * Descriptor redirections. The chosen numbers are arbitrary - just that we
81 * hopefully don't limit any real use of rewritten inode on write-once media
82 * but avoid looping for too long on corrupted media.
83 */
84#define UDF_MAX_TD_NESTING 64
85#define UDF_MAX_LVID_NESTING 1000
86
87enum { UDF_MAX_LINKS = 0xffff };
88
89/* These are the "meat" - everything else is stuffing */
90static int udf_fill_super(struct super_block *, void *, int);
91static void udf_put_super(struct super_block *);
92static int udf_sync_fs(struct super_block *, int);
93static int udf_remount_fs(struct super_block *, int *, char *);
94static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
95static void udf_open_lvid(struct super_block *);
96static void udf_close_lvid(struct super_block *);
97static unsigned int udf_count_free(struct super_block *);
98static int udf_statfs(struct dentry *, struct kstatfs *);
99static int udf_show_options(struct seq_file *, struct dentry *);
100
101struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
102{
103 struct logicalVolIntegrityDesc *lvid;
104 unsigned int partnum;
105 unsigned int offset;
106
107 if (!UDF_SB(sb)->s_lvid_bh)
108 return NULL;
109 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
110 partnum = le32_to_cpu(lvid->numOfPartitions);
111 /* The offset is to skip freeSpaceTable and sizeTable arrays */
112 offset = partnum * 2 * sizeof(uint32_t);
113 return (struct logicalVolIntegrityDescImpUse *)
114 (((uint8_t *)(lvid + 1)) + offset);
115}
116
117/* UDF filesystem type */
118static struct dentry *udf_mount(struct file_system_type *fs_type,
119 int flags, const char *dev_name, void *data)
120{
121 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
122}
123
124static struct file_system_type udf_fstype = {
125 .owner = THIS_MODULE,
126 .name = "udf",
127 .mount = udf_mount,
128 .kill_sb = kill_block_super,
129 .fs_flags = FS_REQUIRES_DEV,
130};
131MODULE_ALIAS_FS("udf");
132
133static struct kmem_cache *udf_inode_cachep;
134
135static struct inode *udf_alloc_inode(struct super_block *sb)
136{
137 struct udf_inode_info *ei;
138 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
139 if (!ei)
140 return NULL;
141
142 ei->i_unique = 0;
143 ei->i_lenExtents = 0;
144 ei->i_lenStreams = 0;
145 ei->i_next_alloc_block = 0;
146 ei->i_next_alloc_goal = 0;
147 ei->i_strat4096 = 0;
148 ei->i_streamdir = 0;
149 init_rwsem(&ei->i_data_sem);
150 ei->cached_extent.lstart = -1;
151 spin_lock_init(&ei->i_extent_cache_lock);
152
153 return &ei->vfs_inode;
154}
155
156static void udf_free_in_core_inode(struct inode *inode)
157{
158 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
159}
160
161static void init_once(void *foo)
162{
163 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
164
165 ei->i_data = NULL;
166 inode_init_once(&ei->vfs_inode);
167}
168
169static int __init init_inodecache(void)
170{
171 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
172 sizeof(struct udf_inode_info),
173 0, (SLAB_RECLAIM_ACCOUNT |
174 SLAB_MEM_SPREAD |
175 SLAB_ACCOUNT),
176 init_once);
177 if (!udf_inode_cachep)
178 return -ENOMEM;
179 return 0;
180}
181
182static void destroy_inodecache(void)
183{
184 /*
185 * Make sure all delayed rcu free inodes are flushed before we
186 * destroy cache.
187 */
188 rcu_barrier();
189 kmem_cache_destroy(udf_inode_cachep);
190}
191
192/* Superblock operations */
193static const struct super_operations udf_sb_ops = {
194 .alloc_inode = udf_alloc_inode,
195 .free_inode = udf_free_in_core_inode,
196 .write_inode = udf_write_inode,
197 .evict_inode = udf_evict_inode,
198 .put_super = udf_put_super,
199 .sync_fs = udf_sync_fs,
200 .statfs = udf_statfs,
201 .remount_fs = udf_remount_fs,
202 .show_options = udf_show_options,
203};
204
205struct udf_options {
206 unsigned char novrs;
207 unsigned int blocksize;
208 unsigned int session;
209 unsigned int lastblock;
210 unsigned int anchor;
211 unsigned int flags;
212 umode_t umask;
213 kgid_t gid;
214 kuid_t uid;
215 umode_t fmode;
216 umode_t dmode;
217 struct nls_table *nls_map;
218};
219
220static int __init init_udf_fs(void)
221{
222 int err;
223
224 err = init_inodecache();
225 if (err)
226 goto out1;
227 err = register_filesystem(&udf_fstype);
228 if (err)
229 goto out;
230
231 return 0;
232
233out:
234 destroy_inodecache();
235
236out1:
237 return err;
238}
239
240static void __exit exit_udf_fs(void)
241{
242 unregister_filesystem(&udf_fstype);
243 destroy_inodecache();
244}
245
246static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
247{
248 struct udf_sb_info *sbi = UDF_SB(sb);
249
250 sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
251 if (!sbi->s_partmaps) {
252 sbi->s_partitions = 0;
253 return -ENOMEM;
254 }
255
256 sbi->s_partitions = count;
257 return 0;
258}
259
260static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
261{
262 int i;
263 int nr_groups = bitmap->s_nr_groups;
264
265 for (i = 0; i < nr_groups; i++)
266 brelse(bitmap->s_block_bitmap[i]);
267
268 kvfree(bitmap);
269}
270
271static void udf_free_partition(struct udf_part_map *map)
272{
273 int i;
274 struct udf_meta_data *mdata;
275
276 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
277 iput(map->s_uspace.s_table);
278 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
279 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
280 if (map->s_partition_type == UDF_SPARABLE_MAP15)
281 for (i = 0; i < 4; i++)
282 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
283 else if (map->s_partition_type == UDF_METADATA_MAP25) {
284 mdata = &map->s_type_specific.s_metadata;
285 iput(mdata->s_metadata_fe);
286 mdata->s_metadata_fe = NULL;
287
288 iput(mdata->s_mirror_fe);
289 mdata->s_mirror_fe = NULL;
290
291 iput(mdata->s_bitmap_fe);
292 mdata->s_bitmap_fe = NULL;
293 }
294}
295
296static void udf_sb_free_partitions(struct super_block *sb)
297{
298 struct udf_sb_info *sbi = UDF_SB(sb);
299 int i;
300
301 if (!sbi->s_partmaps)
302 return;
303 for (i = 0; i < sbi->s_partitions; i++)
304 udf_free_partition(&sbi->s_partmaps[i]);
305 kfree(sbi->s_partmaps);
306 sbi->s_partmaps = NULL;
307}
308
309static int udf_show_options(struct seq_file *seq, struct dentry *root)
310{
311 struct super_block *sb = root->d_sb;
312 struct udf_sb_info *sbi = UDF_SB(sb);
313
314 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
315 seq_puts(seq, ",nostrict");
316 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
317 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
318 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
319 seq_puts(seq, ",unhide");
320 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
321 seq_puts(seq, ",undelete");
322 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
323 seq_puts(seq, ",noadinicb");
324 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
325 seq_puts(seq, ",shortad");
326 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
327 seq_puts(seq, ",uid=forget");
328 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
329 seq_puts(seq, ",gid=forget");
330 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
331 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
332 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
333 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
334 if (sbi->s_umask != 0)
335 seq_printf(seq, ",umask=%ho", sbi->s_umask);
336 if (sbi->s_fmode != UDF_INVALID_MODE)
337 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
338 if (sbi->s_dmode != UDF_INVALID_MODE)
339 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
340 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
341 seq_printf(seq, ",session=%d", sbi->s_session);
342 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
343 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
344 if (sbi->s_anchor != 0)
345 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
346 if (sbi->s_nls_map)
347 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
348 else
349 seq_puts(seq, ",iocharset=utf8");
350
351 return 0;
352}
353
354/*
355 * udf_parse_options
356 *
357 * PURPOSE
358 * Parse mount options.
359 *
360 * DESCRIPTION
361 * The following mount options are supported:
362 *
363 * gid= Set the default group.
364 * umask= Set the default umask.
365 * mode= Set the default file permissions.
366 * dmode= Set the default directory permissions.
367 * uid= Set the default user.
368 * bs= Set the block size.
369 * unhide Show otherwise hidden files.
370 * undelete Show deleted files in lists.
371 * adinicb Embed data in the inode (default)
372 * noadinicb Don't embed data in the inode
373 * shortad Use short ad's
374 * longad Use long ad's (default)
375 * nostrict Unset strict conformance
376 * iocharset= Set the NLS character set
377 *
378 * The remaining are for debugging and disaster recovery:
379 *
380 * novrs Skip volume sequence recognition
381 *
382 * The following expect a offset from 0.
383 *
384 * session= Set the CDROM session (default= last session)
385 * anchor= Override standard anchor location. (default= 256)
386 * volume= Override the VolumeDesc location. (unused)
387 * partition= Override the PartitionDesc location. (unused)
388 * lastblock= Set the last block of the filesystem/
389 *
390 * The following expect a offset from the partition root.
391 *
392 * fileset= Override the fileset block location. (unused)
393 * rootdir= Override the root directory location. (unused)
394 * WARNING: overriding the rootdir to a non-directory may
395 * yield highly unpredictable results.
396 *
397 * PRE-CONDITIONS
398 * options Pointer to mount options string.
399 * uopts Pointer to mount options variable.
400 *
401 * POST-CONDITIONS
402 * <return> 1 Mount options parsed okay.
403 * <return> 0 Error parsing mount options.
404 *
405 * HISTORY
406 * July 1, 1997 - Andrew E. Mileski
407 * Written, tested, and released.
408 */
409
410enum {
411 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
412 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
413 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
414 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
415 Opt_rootdir, Opt_utf8, Opt_iocharset,
416 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
417 Opt_fmode, Opt_dmode
418};
419
420static const match_table_t tokens = {
421 {Opt_novrs, "novrs"},
422 {Opt_nostrict, "nostrict"},
423 {Opt_bs, "bs=%u"},
424 {Opt_unhide, "unhide"},
425 {Opt_undelete, "undelete"},
426 {Opt_noadinicb, "noadinicb"},
427 {Opt_adinicb, "adinicb"},
428 {Opt_shortad, "shortad"},
429 {Opt_longad, "longad"},
430 {Opt_uforget, "uid=forget"},
431 {Opt_uignore, "uid=ignore"},
432 {Opt_gforget, "gid=forget"},
433 {Opt_gignore, "gid=ignore"},
434 {Opt_gid, "gid=%u"},
435 {Opt_uid, "uid=%u"},
436 {Opt_umask, "umask=%o"},
437 {Opt_session, "session=%u"},
438 {Opt_lastblock, "lastblock=%u"},
439 {Opt_anchor, "anchor=%u"},
440 {Opt_volume, "volume=%u"},
441 {Opt_partition, "partition=%u"},
442 {Opt_fileset, "fileset=%u"},
443 {Opt_rootdir, "rootdir=%u"},
444 {Opt_utf8, "utf8"},
445 {Opt_iocharset, "iocharset=%s"},
446 {Opt_fmode, "mode=%o"},
447 {Opt_dmode, "dmode=%o"},
448 {Opt_err, NULL}
449};
450
451static int udf_parse_options(char *options, struct udf_options *uopt,
452 bool remount)
453{
454 char *p;
455 int option;
456 unsigned int uv;
457
458 uopt->novrs = 0;
459 uopt->session = 0xFFFFFFFF;
460 uopt->lastblock = 0;
461 uopt->anchor = 0;
462
463 if (!options)
464 return 1;
465
466 while ((p = strsep(&options, ",")) != NULL) {
467 substring_t args[MAX_OPT_ARGS];
468 int token;
469 unsigned n;
470 if (!*p)
471 continue;
472
473 token = match_token(p, tokens, args);
474 switch (token) {
475 case Opt_novrs:
476 uopt->novrs = 1;
477 break;
478 case Opt_bs:
479 if (match_int(&args[0], &option))
480 return 0;
481 n = option;
482 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
483 return 0;
484 uopt->blocksize = n;
485 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
486 break;
487 case Opt_unhide:
488 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
489 break;
490 case Opt_undelete:
491 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
492 break;
493 case Opt_noadinicb:
494 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
495 break;
496 case Opt_adinicb:
497 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
498 break;
499 case Opt_shortad:
500 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
501 break;
502 case Opt_longad:
503 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
504 break;
505 case Opt_gid:
506 if (match_uint(args, &uv))
507 return 0;
508 uopt->gid = make_kgid(current_user_ns(), uv);
509 if (!gid_valid(uopt->gid))
510 return 0;
511 uopt->flags |= (1 << UDF_FLAG_GID_SET);
512 break;
513 case Opt_uid:
514 if (match_uint(args, &uv))
515 return 0;
516 uopt->uid = make_kuid(current_user_ns(), uv);
517 if (!uid_valid(uopt->uid))
518 return 0;
519 uopt->flags |= (1 << UDF_FLAG_UID_SET);
520 break;
521 case Opt_umask:
522 if (match_octal(args, &option))
523 return 0;
524 uopt->umask = option;
525 break;
526 case Opt_nostrict:
527 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
528 break;
529 case Opt_session:
530 if (match_int(args, &option))
531 return 0;
532 uopt->session = option;
533 if (!remount)
534 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
535 break;
536 case Opt_lastblock:
537 if (match_int(args, &option))
538 return 0;
539 uopt->lastblock = option;
540 if (!remount)
541 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
542 break;
543 case Opt_anchor:
544 if (match_int(args, &option))
545 return 0;
546 uopt->anchor = option;
547 break;
548 case Opt_volume:
549 case Opt_partition:
550 case Opt_fileset:
551 case Opt_rootdir:
552 /* Ignored (never implemented properly) */
553 break;
554 case Opt_utf8:
555 if (!remount) {
556 unload_nls(uopt->nls_map);
557 uopt->nls_map = NULL;
558 }
559 break;
560 case Opt_iocharset:
561 if (!remount) {
562 unload_nls(uopt->nls_map);
563 uopt->nls_map = NULL;
564 }
565 /* When nls_map is not loaded then UTF-8 is used */
566 if (!remount && strcmp(args[0].from, "utf8") != 0) {
567 uopt->nls_map = load_nls(args[0].from);
568 if (!uopt->nls_map) {
569 pr_err("iocharset %s not found\n",
570 args[0].from);
571 return 0;
572 }
573 }
574 break;
575 case Opt_uforget:
576 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
577 break;
578 case Opt_uignore:
579 case Opt_gignore:
580 /* These options are superseeded by uid=<number> */
581 break;
582 case Opt_gforget:
583 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
584 break;
585 case Opt_fmode:
586 if (match_octal(args, &option))
587 return 0;
588 uopt->fmode = option & 0777;
589 break;
590 case Opt_dmode:
591 if (match_octal(args, &option))
592 return 0;
593 uopt->dmode = option & 0777;
594 break;
595 default:
596 pr_err("bad mount option \"%s\" or missing value\n", p);
597 return 0;
598 }
599 }
600 return 1;
601}
602
603static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
604{
605 struct udf_options uopt;
606 struct udf_sb_info *sbi = UDF_SB(sb);
607 int error = 0;
608
609 if (!(*flags & SB_RDONLY) && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
610 return -EACCES;
611
612 sync_filesystem(sb);
613
614 uopt.flags = sbi->s_flags;
615 uopt.uid = sbi->s_uid;
616 uopt.gid = sbi->s_gid;
617 uopt.umask = sbi->s_umask;
618 uopt.fmode = sbi->s_fmode;
619 uopt.dmode = sbi->s_dmode;
620 uopt.nls_map = NULL;
621
622 if (!udf_parse_options(options, &uopt, true))
623 return -EINVAL;
624
625 write_lock(&sbi->s_cred_lock);
626 sbi->s_flags = uopt.flags;
627 sbi->s_uid = uopt.uid;
628 sbi->s_gid = uopt.gid;
629 sbi->s_umask = uopt.umask;
630 sbi->s_fmode = uopt.fmode;
631 sbi->s_dmode = uopt.dmode;
632 write_unlock(&sbi->s_cred_lock);
633
634 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
635 goto out_unlock;
636
637 if (*flags & SB_RDONLY)
638 udf_close_lvid(sb);
639 else
640 udf_open_lvid(sb);
641
642out_unlock:
643 return error;
644}
645
646/*
647 * Check VSD descriptor. Returns -1 in case we are at the end of volume
648 * recognition area, 0 if the descriptor is valid but non-interesting, 1 if
649 * we found one of NSR descriptors we are looking for.
650 */
651static int identify_vsd(const struct volStructDesc *vsd)
652{
653 int ret = 0;
654
655 if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
656 switch (vsd->structType) {
657 case 0:
658 udf_debug("ISO9660 Boot Record found\n");
659 break;
660 case 1:
661 udf_debug("ISO9660 Primary Volume Descriptor found\n");
662 break;
663 case 2:
664 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
665 break;
666 case 3:
667 udf_debug("ISO9660 Volume Partition Descriptor found\n");
668 break;
669 case 255:
670 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
671 break;
672 default:
673 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
674 break;
675 }
676 } else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
677 ; /* ret = 0 */
678 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
679 ret = 1;
680 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
681 ret = 1;
682 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
683 ; /* ret = 0 */
684 else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
685 ; /* ret = 0 */
686 else {
687 /* TEA01 or invalid id : end of volume recognition area */
688 ret = -1;
689 }
690
691 return ret;
692}
693
694/*
695 * Check Volume Structure Descriptors (ECMA 167 2/9.1)
696 * We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
697 * @return 1 if NSR02 or NSR03 found,
698 * -1 if first sector read error, 0 otherwise
699 */
700static int udf_check_vsd(struct super_block *sb)
701{
702 struct volStructDesc *vsd = NULL;
703 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
704 int sectorsize;
705 struct buffer_head *bh = NULL;
706 int nsr = 0;
707 struct udf_sb_info *sbi;
708 loff_t session_offset;
709
710 sbi = UDF_SB(sb);
711 if (sb->s_blocksize < sizeof(struct volStructDesc))
712 sectorsize = sizeof(struct volStructDesc);
713 else
714 sectorsize = sb->s_blocksize;
715
716 session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
717 sector += session_offset;
718
719 udf_debug("Starting at sector %u (%lu byte sectors)\n",
720 (unsigned int)(sector >> sb->s_blocksize_bits),
721 sb->s_blocksize);
722 /* Process the sequence (if applicable). The hard limit on the sector
723 * offset is arbitrary, hopefully large enough so that all valid UDF
724 * filesystems will be recognised. There is no mention of an upper
725 * bound to the size of the volume recognition area in the standard.
726 * The limit will prevent the code to read all the sectors of a
727 * specially crafted image (like a bluray disc full of CD001 sectors),
728 * potentially causing minutes or even hours of uninterruptible I/O
729 * activity. This actually happened with uninitialised SSD partitions
730 * (all 0xFF) before the check for the limit and all valid IDs were
731 * added */
732 for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
733 /* Read a block */
734 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
735 if (!bh)
736 break;
737
738 vsd = (struct volStructDesc *)(bh->b_data +
739 (sector & (sb->s_blocksize - 1)));
740 nsr = identify_vsd(vsd);
741 /* Found NSR or end? */
742 if (nsr) {
743 brelse(bh);
744 break;
745 }
746 /*
747 * Special handling for improperly formatted VRS (e.g., Win10)
748 * where components are separated by 2048 bytes even though
749 * sectors are 4K
750 */
751 if (sb->s_blocksize == 4096) {
752 nsr = identify_vsd(vsd + 1);
753 /* Ignore unknown IDs... */
754 if (nsr < 0)
755 nsr = 0;
756 }
757 brelse(bh);
758 }
759
760 if (nsr > 0)
761 return 1;
762 else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
763 return -1;
764 else
765 return 0;
766}
767
768static int udf_verify_domain_identifier(struct super_block *sb,
769 struct regid *ident, char *dname)
770{
771 struct domainIdentSuffix *suffix;
772
773 if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
774 udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
775 goto force_ro;
776 }
777 if (ident->flags & ENTITYID_FLAGS_DIRTY) {
778 udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
779 dname);
780 goto force_ro;
781 }
782 suffix = (struct domainIdentSuffix *)ident->identSuffix;
783 if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
784 (suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
785 if (!sb_rdonly(sb)) {
786 udf_warn(sb, "Descriptor for %s marked write protected."
787 " Forcing read only mount.\n", dname);
788 }
789 goto force_ro;
790 }
791 return 0;
792
793force_ro:
794 if (!sb_rdonly(sb))
795 return -EACCES;
796 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
797 return 0;
798}
799
800static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
801 struct kernel_lb_addr *root)
802{
803 int ret;
804
805 ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
806 if (ret < 0)
807 return ret;
808
809 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
810 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
811
812 udf_debug("Rootdir at block=%u, partition=%u\n",
813 root->logicalBlockNum, root->partitionReferenceNum);
814 return 0;
815}
816
817static int udf_find_fileset(struct super_block *sb,
818 struct kernel_lb_addr *fileset,
819 struct kernel_lb_addr *root)
820{
821 struct buffer_head *bh = NULL;
822 uint16_t ident;
823 int ret;
824
825 if (fileset->logicalBlockNum == 0xFFFFFFFF &&
826 fileset->partitionReferenceNum == 0xFFFF)
827 return -EINVAL;
828
829 bh = udf_read_ptagged(sb, fileset, 0, &ident);
830 if (!bh)
831 return -EIO;
832 if (ident != TAG_IDENT_FSD) {
833 brelse(bh);
834 return -EINVAL;
835 }
836
837 udf_debug("Fileset at block=%u, partition=%u\n",
838 fileset->logicalBlockNum, fileset->partitionReferenceNum);
839
840 UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
841 ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
842 brelse(bh);
843 return ret;
844}
845
846/*
847 * Load primary Volume Descriptor Sequence
848 *
849 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
850 * should be tried.
851 */
852static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
853{
854 struct primaryVolDesc *pvoldesc;
855 uint8_t *outstr;
856 struct buffer_head *bh;
857 uint16_t ident;
858 int ret;
859 struct timestamp *ts;
860
861 outstr = kmalloc(128, GFP_NOFS);
862 if (!outstr)
863 return -ENOMEM;
864
865 bh = udf_read_tagged(sb, block, block, &ident);
866 if (!bh) {
867 ret = -EAGAIN;
868 goto out2;
869 }
870
871 if (ident != TAG_IDENT_PVD) {
872 ret = -EIO;
873 goto out_bh;
874 }
875
876 pvoldesc = (struct primaryVolDesc *)bh->b_data;
877
878 udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
879 pvoldesc->recordingDateAndTime);
880 ts = &pvoldesc->recordingDateAndTime;
881 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
882 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
883 ts->minute, le16_to_cpu(ts->typeAndTimezone));
884
885 ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
886 if (ret < 0) {
887 strcpy(UDF_SB(sb)->s_volume_ident, "InvalidName");
888 pr_warn("incorrect volume identification, setting to "
889 "'InvalidName'\n");
890 } else {
891 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
892 }
893 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
894
895 ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
896 if (ret < 0) {
897 ret = 0;
898 goto out_bh;
899 }
900 outstr[ret] = 0;
901 udf_debug("volSetIdent[] = '%s'\n", outstr);
902
903 ret = 0;
904out_bh:
905 brelse(bh);
906out2:
907 kfree(outstr);
908 return ret;
909}
910
911struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
912 u32 meta_file_loc, u32 partition_ref)
913{
914 struct kernel_lb_addr addr;
915 struct inode *metadata_fe;
916
917 addr.logicalBlockNum = meta_file_loc;
918 addr.partitionReferenceNum = partition_ref;
919
920 metadata_fe = udf_iget_special(sb, &addr);
921
922 if (IS_ERR(metadata_fe)) {
923 udf_warn(sb, "metadata inode efe not found\n");
924 return metadata_fe;
925 }
926 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
927 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
928 iput(metadata_fe);
929 return ERR_PTR(-EIO);
930 }
931
932 return metadata_fe;
933}
934
935static int udf_load_metadata_files(struct super_block *sb, int partition,
936 int type1_index)
937{
938 struct udf_sb_info *sbi = UDF_SB(sb);
939 struct udf_part_map *map;
940 struct udf_meta_data *mdata;
941 struct kernel_lb_addr addr;
942 struct inode *fe;
943
944 map = &sbi->s_partmaps[partition];
945 mdata = &map->s_type_specific.s_metadata;
946 mdata->s_phys_partition_ref = type1_index;
947
948 /* metadata address */
949 udf_debug("Metadata file location: block = %u part = %u\n",
950 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
951
952 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
953 mdata->s_phys_partition_ref);
954 if (IS_ERR(fe)) {
955 /* mirror file entry */
956 udf_debug("Mirror metadata file location: block = %u part = %u\n",
957 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
958
959 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
960 mdata->s_phys_partition_ref);
961
962 if (IS_ERR(fe)) {
963 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
964 return PTR_ERR(fe);
965 }
966 mdata->s_mirror_fe = fe;
967 } else
968 mdata->s_metadata_fe = fe;
969
970
971 /*
972 * bitmap file entry
973 * Note:
974 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
975 */
976 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
977 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
978 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
979
980 udf_debug("Bitmap file location: block = %u part = %u\n",
981 addr.logicalBlockNum, addr.partitionReferenceNum);
982
983 fe = udf_iget_special(sb, &addr);
984 if (IS_ERR(fe)) {
985 if (sb_rdonly(sb))
986 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
987 else {
988 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
989 return PTR_ERR(fe);
990 }
991 } else
992 mdata->s_bitmap_fe = fe;
993 }
994
995 udf_debug("udf_load_metadata_files Ok\n");
996 return 0;
997}
998
999int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1000{
1001 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1002 return DIV_ROUND_UP(map->s_partition_len +
1003 (sizeof(struct spaceBitmapDesc) << 3),
1004 sb->s_blocksize * 8);
1005}
1006
1007static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1008{
1009 struct udf_bitmap *bitmap;
1010 int nr_groups = udf_compute_nr_groups(sb, index);
1011
1012 bitmap = kvzalloc(struct_size(bitmap, s_block_bitmap, nr_groups),
1013 GFP_KERNEL);
1014 if (!bitmap)
1015 return NULL;
1016
1017 bitmap->s_nr_groups = nr_groups;
1018 return bitmap;
1019}
1020
1021static int check_partition_desc(struct super_block *sb,
1022 struct partitionDesc *p,
1023 struct udf_part_map *map)
1024{
1025 bool umap, utable, fmap, ftable;
1026 struct partitionHeaderDesc *phd;
1027
1028 switch (le32_to_cpu(p->accessType)) {
1029 case PD_ACCESS_TYPE_READ_ONLY:
1030 case PD_ACCESS_TYPE_WRITE_ONCE:
1031 case PD_ACCESS_TYPE_NONE:
1032 goto force_ro;
1033 }
1034
1035 /* No Partition Header Descriptor? */
1036 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1037 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1038 goto force_ro;
1039
1040 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1041 utable = phd->unallocSpaceTable.extLength;
1042 umap = phd->unallocSpaceBitmap.extLength;
1043 ftable = phd->freedSpaceTable.extLength;
1044 fmap = phd->freedSpaceBitmap.extLength;
1045
1046 /* No allocation info? */
1047 if (!utable && !umap && !ftable && !fmap)
1048 goto force_ro;
1049
1050 /* We don't support blocks that require erasing before overwrite */
1051 if (ftable || fmap)
1052 goto force_ro;
1053 /* UDF 2.60: 2.3.3 - no mixing of tables & bitmaps, no VAT. */
1054 if (utable && umap)
1055 goto force_ro;
1056
1057 if (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1058 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1059 map->s_partition_type == UDF_METADATA_MAP25)
1060 goto force_ro;
1061
1062 return 0;
1063force_ro:
1064 if (!sb_rdonly(sb))
1065 return -EACCES;
1066 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1067 return 0;
1068}
1069
1070static int udf_fill_partdesc_info(struct super_block *sb,
1071 struct partitionDesc *p, int p_index)
1072{
1073 struct udf_part_map *map;
1074 struct udf_sb_info *sbi = UDF_SB(sb);
1075 struct partitionHeaderDesc *phd;
1076 int err;
1077
1078 map = &sbi->s_partmaps[p_index];
1079
1080 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1081 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1082
1083 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1084 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1085 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1086 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1087 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1088 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1089 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1090 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1091
1092 udf_debug("Partition (%d type %x) starts at physical %u, block length %u\n",
1093 p_index, map->s_partition_type,
1094 map->s_partition_root, map->s_partition_len);
1095
1096 err = check_partition_desc(sb, p, map);
1097 if (err)
1098 return err;
1099
1100 /*
1101 * Skip loading allocation info it we cannot ever write to the fs.
1102 * This is a correctness thing as we may have decided to force ro mount
1103 * to avoid allocation info we don't support.
1104 */
1105 if (UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
1106 return 0;
1107
1108 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1109 if (phd->unallocSpaceTable.extLength) {
1110 struct kernel_lb_addr loc = {
1111 .logicalBlockNum = le32_to_cpu(
1112 phd->unallocSpaceTable.extPosition),
1113 .partitionReferenceNum = p_index,
1114 };
1115 struct inode *inode;
1116
1117 inode = udf_iget_special(sb, &loc);
1118 if (IS_ERR(inode)) {
1119 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1120 p_index);
1121 return PTR_ERR(inode);
1122 }
1123 map->s_uspace.s_table = inode;
1124 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1125 udf_debug("unallocSpaceTable (part %d) @ %lu\n",
1126 p_index, map->s_uspace.s_table->i_ino);
1127 }
1128
1129 if (phd->unallocSpaceBitmap.extLength) {
1130 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1131 if (!bitmap)
1132 return -ENOMEM;
1133 map->s_uspace.s_bitmap = bitmap;
1134 bitmap->s_extPosition = le32_to_cpu(
1135 phd->unallocSpaceBitmap.extPosition);
1136 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1137 udf_debug("unallocSpaceBitmap (part %d) @ %u\n",
1138 p_index, bitmap->s_extPosition);
1139 }
1140
1141 return 0;
1142}
1143
1144static void udf_find_vat_block(struct super_block *sb, int p_index,
1145 int type1_index, sector_t start_block)
1146{
1147 struct udf_sb_info *sbi = UDF_SB(sb);
1148 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1149 sector_t vat_block;
1150 struct kernel_lb_addr ino;
1151 struct inode *inode;
1152
1153 /*
1154 * VAT file entry is in the last recorded block. Some broken disks have
1155 * it a few blocks before so try a bit harder...
1156 */
1157 ino.partitionReferenceNum = type1_index;
1158 for (vat_block = start_block;
1159 vat_block >= map->s_partition_root &&
1160 vat_block >= start_block - 3; vat_block--) {
1161 ino.logicalBlockNum = vat_block - map->s_partition_root;
1162 inode = udf_iget_special(sb, &ino);
1163 if (!IS_ERR(inode)) {
1164 sbi->s_vat_inode = inode;
1165 break;
1166 }
1167 }
1168}
1169
1170static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1171{
1172 struct udf_sb_info *sbi = UDF_SB(sb);
1173 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1174 struct buffer_head *bh = NULL;
1175 struct udf_inode_info *vati;
1176 uint32_t pos;
1177 struct virtualAllocationTable20 *vat20;
1178 sector_t blocks = i_size_read(sb->s_bdev->bd_inode) >>
1179 sb->s_blocksize_bits;
1180
1181 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1182 if (!sbi->s_vat_inode &&
1183 sbi->s_last_block != blocks - 1) {
1184 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1185 (unsigned long)sbi->s_last_block,
1186 (unsigned long)blocks - 1);
1187 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1188 }
1189 if (!sbi->s_vat_inode)
1190 return -EIO;
1191
1192 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1193 map->s_type_specific.s_virtual.s_start_offset = 0;
1194 map->s_type_specific.s_virtual.s_num_entries =
1195 (sbi->s_vat_inode->i_size - 36) >> 2;
1196 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1197 vati = UDF_I(sbi->s_vat_inode);
1198 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1199 pos = udf_block_map(sbi->s_vat_inode, 0);
1200 bh = sb_bread(sb, pos);
1201 if (!bh)
1202 return -EIO;
1203 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1204 } else {
1205 vat20 = (struct virtualAllocationTable20 *)
1206 vati->i_data;
1207 }
1208
1209 map->s_type_specific.s_virtual.s_start_offset =
1210 le16_to_cpu(vat20->lengthHeader);
1211 map->s_type_specific.s_virtual.s_num_entries =
1212 (sbi->s_vat_inode->i_size -
1213 map->s_type_specific.s_virtual.
1214 s_start_offset) >> 2;
1215 brelse(bh);
1216 }
1217 return 0;
1218}
1219
1220/*
1221 * Load partition descriptor block
1222 *
1223 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1224 * sequence.
1225 */
1226static int udf_load_partdesc(struct super_block *sb, sector_t block)
1227{
1228 struct buffer_head *bh;
1229 struct partitionDesc *p;
1230 struct udf_part_map *map;
1231 struct udf_sb_info *sbi = UDF_SB(sb);
1232 int i, type1_idx;
1233 uint16_t partitionNumber;
1234 uint16_t ident;
1235 int ret;
1236
1237 bh = udf_read_tagged(sb, block, block, &ident);
1238 if (!bh)
1239 return -EAGAIN;
1240 if (ident != TAG_IDENT_PD) {
1241 ret = 0;
1242 goto out_bh;
1243 }
1244
1245 p = (struct partitionDesc *)bh->b_data;
1246 partitionNumber = le16_to_cpu(p->partitionNumber);
1247
1248 /* First scan for TYPE1 and SPARABLE partitions */
1249 for (i = 0; i < sbi->s_partitions; i++) {
1250 map = &sbi->s_partmaps[i];
1251 udf_debug("Searching map: (%u == %u)\n",
1252 map->s_partition_num, partitionNumber);
1253 if (map->s_partition_num == partitionNumber &&
1254 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1255 map->s_partition_type == UDF_SPARABLE_MAP15))
1256 break;
1257 }
1258
1259 if (i >= sbi->s_partitions) {
1260 udf_debug("Partition (%u) not found in partition map\n",
1261 partitionNumber);
1262 ret = 0;
1263 goto out_bh;
1264 }
1265
1266 ret = udf_fill_partdesc_info(sb, p, i);
1267 if (ret < 0)
1268 goto out_bh;
1269
1270 /*
1271 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1272 * PHYSICAL partitions are already set up
1273 */
1274 type1_idx = i;
1275 map = NULL; /* supress 'maybe used uninitialized' warning */
1276 for (i = 0; i < sbi->s_partitions; i++) {
1277 map = &sbi->s_partmaps[i];
1278
1279 if (map->s_partition_num == partitionNumber &&
1280 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1281 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1282 map->s_partition_type == UDF_METADATA_MAP25))
1283 break;
1284 }
1285
1286 if (i >= sbi->s_partitions) {
1287 ret = 0;
1288 goto out_bh;
1289 }
1290
1291 ret = udf_fill_partdesc_info(sb, p, i);
1292 if (ret < 0)
1293 goto out_bh;
1294
1295 if (map->s_partition_type == UDF_METADATA_MAP25) {
1296 ret = udf_load_metadata_files(sb, i, type1_idx);
1297 if (ret < 0) {
1298 udf_err(sb, "error loading MetaData partition map %d\n",
1299 i);
1300 goto out_bh;
1301 }
1302 } else {
1303 /*
1304 * If we have a partition with virtual map, we don't handle
1305 * writing to it (we overwrite blocks instead of relocating
1306 * them).
1307 */
1308 if (!sb_rdonly(sb)) {
1309 ret = -EACCES;
1310 goto out_bh;
1311 }
1312 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1313 ret = udf_load_vat(sb, i, type1_idx);
1314 if (ret < 0)
1315 goto out_bh;
1316 }
1317 ret = 0;
1318out_bh:
1319 /* In case loading failed, we handle cleanup in udf_fill_super */
1320 brelse(bh);
1321 return ret;
1322}
1323
1324static int udf_load_sparable_map(struct super_block *sb,
1325 struct udf_part_map *map,
1326 struct sparablePartitionMap *spm)
1327{
1328 uint32_t loc;
1329 uint16_t ident;
1330 struct sparingTable *st;
1331 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1332 int i;
1333 struct buffer_head *bh;
1334
1335 map->s_partition_type = UDF_SPARABLE_MAP15;
1336 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1337 if (!is_power_of_2(sdata->s_packet_len)) {
1338 udf_err(sb, "error loading logical volume descriptor: "
1339 "Invalid packet length %u\n",
1340 (unsigned)sdata->s_packet_len);
1341 return -EIO;
1342 }
1343 if (spm->numSparingTables > 4) {
1344 udf_err(sb, "error loading logical volume descriptor: "
1345 "Too many sparing tables (%d)\n",
1346 (int)spm->numSparingTables);
1347 return -EIO;
1348 }
1349 if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
1350 udf_err(sb, "error loading logical volume descriptor: "
1351 "Too big sparing table size (%u)\n",
1352 le32_to_cpu(spm->sizeSparingTable));
1353 return -EIO;
1354 }
1355
1356 for (i = 0; i < spm->numSparingTables; i++) {
1357 loc = le32_to_cpu(spm->locSparingTable[i]);
1358 bh = udf_read_tagged(sb, loc, loc, &ident);
1359 if (!bh)
1360 continue;
1361
1362 st = (struct sparingTable *)bh->b_data;
1363 if (ident != 0 ||
1364 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1365 strlen(UDF_ID_SPARING)) ||
1366 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1367 sb->s_blocksize) {
1368 brelse(bh);
1369 continue;
1370 }
1371
1372 sdata->s_spar_map[i] = bh;
1373 }
1374 map->s_partition_func = udf_get_pblock_spar15;
1375 return 0;
1376}
1377
1378static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1379 struct kernel_lb_addr *fileset)
1380{
1381 struct logicalVolDesc *lvd;
1382 int i, offset;
1383 uint8_t type;
1384 struct udf_sb_info *sbi = UDF_SB(sb);
1385 struct genericPartitionMap *gpm;
1386 uint16_t ident;
1387 struct buffer_head *bh;
1388 unsigned int table_len;
1389 int ret;
1390
1391 bh = udf_read_tagged(sb, block, block, &ident);
1392 if (!bh)
1393 return -EAGAIN;
1394 BUG_ON(ident != TAG_IDENT_LVD);
1395 lvd = (struct logicalVolDesc *)bh->b_data;
1396 table_len = le32_to_cpu(lvd->mapTableLength);
1397 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1398 udf_err(sb, "error loading logical volume descriptor: "
1399 "Partition table too long (%u > %lu)\n", table_len,
1400 sb->s_blocksize - sizeof(*lvd));
1401 ret = -EIO;
1402 goto out_bh;
1403 }
1404
1405 ret = udf_verify_domain_identifier(sb, &lvd->domainIdent,
1406 "logical volume");
1407 if (ret)
1408 goto out_bh;
1409 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1410 if (ret)
1411 goto out_bh;
1412
1413 for (i = 0, offset = 0;
1414 i < sbi->s_partitions && offset < table_len;
1415 i++, offset += gpm->partitionMapLength) {
1416 struct udf_part_map *map = &sbi->s_partmaps[i];
1417 gpm = (struct genericPartitionMap *)
1418 &(lvd->partitionMaps[offset]);
1419 type = gpm->partitionMapType;
1420 if (type == 1) {
1421 struct genericPartitionMap1 *gpm1 =
1422 (struct genericPartitionMap1 *)gpm;
1423 map->s_partition_type = UDF_TYPE1_MAP15;
1424 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1425 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1426 map->s_partition_func = NULL;
1427 } else if (type == 2) {
1428 struct udfPartitionMap2 *upm2 =
1429 (struct udfPartitionMap2 *)gpm;
1430 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1431 strlen(UDF_ID_VIRTUAL))) {
1432 u16 suf =
1433 le16_to_cpu(((__le16 *)upm2->partIdent.
1434 identSuffix)[0]);
1435 if (suf < 0x0200) {
1436 map->s_partition_type =
1437 UDF_VIRTUAL_MAP15;
1438 map->s_partition_func =
1439 udf_get_pblock_virt15;
1440 } else {
1441 map->s_partition_type =
1442 UDF_VIRTUAL_MAP20;
1443 map->s_partition_func =
1444 udf_get_pblock_virt20;
1445 }
1446 } else if (!strncmp(upm2->partIdent.ident,
1447 UDF_ID_SPARABLE,
1448 strlen(UDF_ID_SPARABLE))) {
1449 ret = udf_load_sparable_map(sb, map,
1450 (struct sparablePartitionMap *)gpm);
1451 if (ret < 0)
1452 goto out_bh;
1453 } else if (!strncmp(upm2->partIdent.ident,
1454 UDF_ID_METADATA,
1455 strlen(UDF_ID_METADATA))) {
1456 struct udf_meta_data *mdata =
1457 &map->s_type_specific.s_metadata;
1458 struct metadataPartitionMap *mdm =
1459 (struct metadataPartitionMap *)
1460 &(lvd->partitionMaps[offset]);
1461 udf_debug("Parsing Logical vol part %d type %u id=%s\n",
1462 i, type, UDF_ID_METADATA);
1463
1464 map->s_partition_type = UDF_METADATA_MAP25;
1465 map->s_partition_func = udf_get_pblock_meta25;
1466
1467 mdata->s_meta_file_loc =
1468 le32_to_cpu(mdm->metadataFileLoc);
1469 mdata->s_mirror_file_loc =
1470 le32_to_cpu(mdm->metadataMirrorFileLoc);
1471 mdata->s_bitmap_file_loc =
1472 le32_to_cpu(mdm->metadataBitmapFileLoc);
1473 mdata->s_alloc_unit_size =
1474 le32_to_cpu(mdm->allocUnitSize);
1475 mdata->s_align_unit_size =
1476 le16_to_cpu(mdm->alignUnitSize);
1477 if (mdm->flags & 0x01)
1478 mdata->s_flags |= MF_DUPLICATE_MD;
1479
1480 udf_debug("Metadata Ident suffix=0x%x\n",
1481 le16_to_cpu(*(__le16 *)
1482 mdm->partIdent.identSuffix));
1483 udf_debug("Metadata part num=%u\n",
1484 le16_to_cpu(mdm->partitionNum));
1485 udf_debug("Metadata part alloc unit size=%u\n",
1486 le32_to_cpu(mdm->allocUnitSize));
1487 udf_debug("Metadata file loc=%u\n",
1488 le32_to_cpu(mdm->metadataFileLoc));
1489 udf_debug("Mirror file loc=%u\n",
1490 le32_to_cpu(mdm->metadataMirrorFileLoc));
1491 udf_debug("Bitmap file loc=%u\n",
1492 le32_to_cpu(mdm->metadataBitmapFileLoc));
1493 udf_debug("Flags: %d %u\n",
1494 mdata->s_flags, mdm->flags);
1495 } else {
1496 udf_debug("Unknown ident: %s\n",
1497 upm2->partIdent.ident);
1498 continue;
1499 }
1500 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1501 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1502 }
1503 udf_debug("Partition (%d:%u) type %u on volume %u\n",
1504 i, map->s_partition_num, type, map->s_volumeseqnum);
1505 }
1506
1507 if (fileset) {
1508 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1509
1510 *fileset = lelb_to_cpu(la->extLocation);
1511 udf_debug("FileSet found in LogicalVolDesc at block=%u, partition=%u\n",
1512 fileset->logicalBlockNum,
1513 fileset->partitionReferenceNum);
1514 }
1515 if (lvd->integritySeqExt.extLength)
1516 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1517 ret = 0;
1518
1519 if (!sbi->s_lvid_bh) {
1520 /* We can't generate unique IDs without a valid LVID */
1521 if (sb_rdonly(sb)) {
1522 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
1523 } else {
1524 udf_warn(sb, "Damaged or missing LVID, forcing "
1525 "readonly mount\n");
1526 ret = -EACCES;
1527 }
1528 }
1529out_bh:
1530 brelse(bh);
1531 return ret;
1532}
1533
1534/*
1535 * Find the prevailing Logical Volume Integrity Descriptor.
1536 */
1537static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1538{
1539 struct buffer_head *bh, *final_bh;
1540 uint16_t ident;
1541 struct udf_sb_info *sbi = UDF_SB(sb);
1542 struct logicalVolIntegrityDesc *lvid;
1543 int indirections = 0;
1544 u32 parts, impuselen;
1545
1546 while (++indirections <= UDF_MAX_LVID_NESTING) {
1547 final_bh = NULL;
1548 while (loc.extLength > 0 &&
1549 (bh = udf_read_tagged(sb, loc.extLocation,
1550 loc.extLocation, &ident))) {
1551 if (ident != TAG_IDENT_LVID) {
1552 brelse(bh);
1553 break;
1554 }
1555
1556 brelse(final_bh);
1557 final_bh = bh;
1558
1559 loc.extLength -= sb->s_blocksize;
1560 loc.extLocation++;
1561 }
1562
1563 if (!final_bh)
1564 return;
1565
1566 brelse(sbi->s_lvid_bh);
1567 sbi->s_lvid_bh = final_bh;
1568
1569 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1570 if (lvid->nextIntegrityExt.extLength == 0)
1571 goto check;
1572
1573 loc = leea_to_cpu(lvid->nextIntegrityExt);
1574 }
1575
1576 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1577 UDF_MAX_LVID_NESTING);
1578out_err:
1579 brelse(sbi->s_lvid_bh);
1580 sbi->s_lvid_bh = NULL;
1581 return;
1582check:
1583 parts = le32_to_cpu(lvid->numOfPartitions);
1584 impuselen = le32_to_cpu(lvid->lengthOfImpUse);
1585 if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
1586 sizeof(struct logicalVolIntegrityDesc) + impuselen +
1587 2 * parts * sizeof(u32) > sb->s_blocksize) {
1588 udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
1589 "ignoring.\n", parts, impuselen);
1590 goto out_err;
1591 }
1592}
1593
1594/*
1595 * Step for reallocation of table of partition descriptor sequence numbers.
1596 * Must be power of 2.
1597 */
1598#define PART_DESC_ALLOC_STEP 32
1599
1600struct part_desc_seq_scan_data {
1601 struct udf_vds_record rec;
1602 u32 partnum;
1603};
1604
1605struct desc_seq_scan_data {
1606 struct udf_vds_record vds[VDS_POS_LENGTH];
1607 unsigned int size_part_descs;
1608 unsigned int num_part_descs;
1609 struct part_desc_seq_scan_data *part_descs_loc;
1610};
1611
1612static struct udf_vds_record *handle_partition_descriptor(
1613 struct buffer_head *bh,
1614 struct desc_seq_scan_data *data)
1615{
1616 struct partitionDesc *desc = (struct partitionDesc *)bh->b_data;
1617 int partnum;
1618 int i;
1619
1620 partnum = le16_to_cpu(desc->partitionNumber);
1621 for (i = 0; i < data->num_part_descs; i++)
1622 if (partnum == data->part_descs_loc[i].partnum)
1623 return &(data->part_descs_loc[i].rec);
1624 if (data->num_part_descs >= data->size_part_descs) {
1625 struct part_desc_seq_scan_data *new_loc;
1626 unsigned int new_size = ALIGN(partnum, PART_DESC_ALLOC_STEP);
1627
1628 new_loc = kcalloc(new_size, sizeof(*new_loc), GFP_KERNEL);
1629 if (!new_loc)
1630 return ERR_PTR(-ENOMEM);
1631 memcpy(new_loc, data->part_descs_loc,
1632 data->size_part_descs * sizeof(*new_loc));
1633 kfree(data->part_descs_loc);
1634 data->part_descs_loc = new_loc;
1635 data->size_part_descs = new_size;
1636 }
1637 return &(data->part_descs_loc[data->num_part_descs++].rec);
1638}
1639
1640
1641static struct udf_vds_record *get_volume_descriptor_record(uint16_t ident,
1642 struct buffer_head *bh, struct desc_seq_scan_data *data)
1643{
1644 switch (ident) {
1645 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1646 return &(data->vds[VDS_POS_PRIMARY_VOL_DESC]);
1647 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1648 return &(data->vds[VDS_POS_IMP_USE_VOL_DESC]);
1649 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1650 return &(data->vds[VDS_POS_LOGICAL_VOL_DESC]);
1651 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1652 return &(data->vds[VDS_POS_UNALLOC_SPACE_DESC]);
1653 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1654 return handle_partition_descriptor(bh, data);
1655 }
1656 return NULL;
1657}
1658
1659/*
1660 * Process a main/reserve volume descriptor sequence.
1661 * @block First block of first extent of the sequence.
1662 * @lastblock Lastblock of first extent of the sequence.
1663 * @fileset There we store extent containing root fileset
1664 *
1665 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1666 * sequence
1667 */
1668static noinline int udf_process_sequence(
1669 struct super_block *sb,
1670 sector_t block, sector_t lastblock,
1671 struct kernel_lb_addr *fileset)
1672{
1673 struct buffer_head *bh = NULL;
1674 struct udf_vds_record *curr;
1675 struct generic_desc *gd;
1676 struct volDescPtr *vdp;
1677 bool done = false;
1678 uint32_t vdsn;
1679 uint16_t ident;
1680 int ret;
1681 unsigned int indirections = 0;
1682 struct desc_seq_scan_data data;
1683 unsigned int i;
1684
1685 memset(data.vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1686 data.size_part_descs = PART_DESC_ALLOC_STEP;
1687 data.num_part_descs = 0;
1688 data.part_descs_loc = kcalloc(data.size_part_descs,
1689 sizeof(*data.part_descs_loc),
1690 GFP_KERNEL);
1691 if (!data.part_descs_loc)
1692 return -ENOMEM;
1693
1694 /*
1695 * Read the main descriptor sequence and find which descriptors
1696 * are in it.
1697 */
1698 for (; (!done && block <= lastblock); block++) {
1699 bh = udf_read_tagged(sb, block, block, &ident);
1700 if (!bh)
1701 break;
1702
1703 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1704 gd = (struct generic_desc *)bh->b_data;
1705 vdsn = le32_to_cpu(gd->volDescSeqNum);
1706 switch (ident) {
1707 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1708 if (++indirections > UDF_MAX_TD_NESTING) {
1709 udf_err(sb, "too many Volume Descriptor "
1710 "Pointers (max %u supported)\n",
1711 UDF_MAX_TD_NESTING);
1712 brelse(bh);
1713 ret = -EIO;
1714 goto out;
1715 }
1716
1717 vdp = (struct volDescPtr *)bh->b_data;
1718 block = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1719 lastblock = le32_to_cpu(
1720 vdp->nextVolDescSeqExt.extLength) >>
1721 sb->s_blocksize_bits;
1722 lastblock += block - 1;
1723 /* For loop is going to increment 'block' again */
1724 block--;
1725 break;
1726 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1727 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1728 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1729 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1730 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1731 curr = get_volume_descriptor_record(ident, bh, &data);
1732 if (IS_ERR(curr)) {
1733 brelse(bh);
1734 ret = PTR_ERR(curr);
1735 goto out;
1736 }
1737 /* Descriptor we don't care about? */
1738 if (!curr)
1739 break;
1740 if (vdsn >= curr->volDescSeqNum) {
1741 curr->volDescSeqNum = vdsn;
1742 curr->block = block;
1743 }
1744 break;
1745 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1746 done = true;
1747 break;
1748 }
1749 brelse(bh);
1750 }
1751 /*
1752 * Now read interesting descriptors again and process them
1753 * in a suitable order
1754 */
1755 if (!data.vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1756 udf_err(sb, "Primary Volume Descriptor not found!\n");
1757 ret = -EAGAIN;
1758 goto out;
1759 }
1760 ret = udf_load_pvoldesc(sb, data.vds[VDS_POS_PRIMARY_VOL_DESC].block);
1761 if (ret < 0)
1762 goto out;
1763
1764 if (data.vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1765 ret = udf_load_logicalvol(sb,
1766 data.vds[VDS_POS_LOGICAL_VOL_DESC].block,
1767 fileset);
1768 if (ret < 0)
1769 goto out;
1770 }
1771
1772 /* Now handle prevailing Partition Descriptors */
1773 for (i = 0; i < data.num_part_descs; i++) {
1774 ret = udf_load_partdesc(sb, data.part_descs_loc[i].rec.block);
1775 if (ret < 0)
1776 goto out;
1777 }
1778 ret = 0;
1779out:
1780 kfree(data.part_descs_loc);
1781 return ret;
1782}
1783
1784/*
1785 * Load Volume Descriptor Sequence described by anchor in bh
1786 *
1787 * Returns <0 on error, 0 on success
1788 */
1789static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1790 struct kernel_lb_addr *fileset)
1791{
1792 struct anchorVolDescPtr *anchor;
1793 sector_t main_s, main_e, reserve_s, reserve_e;
1794 int ret;
1795
1796 anchor = (struct anchorVolDescPtr *)bh->b_data;
1797
1798 /* Locate the main sequence */
1799 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1800 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1801 main_e = main_e >> sb->s_blocksize_bits;
1802 main_e += main_s - 1;
1803
1804 /* Locate the reserve sequence */
1805 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1806 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1807 reserve_e = reserve_e >> sb->s_blocksize_bits;
1808 reserve_e += reserve_s - 1;
1809
1810 /* Process the main & reserve sequences */
1811 /* responsible for finding the PartitionDesc(s) */
1812 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1813 if (ret != -EAGAIN)
1814 return ret;
1815 udf_sb_free_partitions(sb);
1816 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1817 if (ret < 0) {
1818 udf_sb_free_partitions(sb);
1819 /* No sequence was OK, return -EIO */
1820 if (ret == -EAGAIN)
1821 ret = -EIO;
1822 }
1823 return ret;
1824}
1825
1826/*
1827 * Check whether there is an anchor block in the given block and
1828 * load Volume Descriptor Sequence if so.
1829 *
1830 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1831 * block
1832 */
1833static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1834 struct kernel_lb_addr *fileset)
1835{
1836 struct buffer_head *bh;
1837 uint16_t ident;
1838 int ret;
1839
1840 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1841 udf_fixed_to_variable(block) >=
1842 i_size_read(sb->s_bdev->bd_inode) >> sb->s_blocksize_bits)
1843 return -EAGAIN;
1844
1845 bh = udf_read_tagged(sb, block, block, &ident);
1846 if (!bh)
1847 return -EAGAIN;
1848 if (ident != TAG_IDENT_AVDP) {
1849 brelse(bh);
1850 return -EAGAIN;
1851 }
1852 ret = udf_load_sequence(sb, bh, fileset);
1853 brelse(bh);
1854 return ret;
1855}
1856
1857/*
1858 * Search for an anchor volume descriptor pointer.
1859 *
1860 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1861 * of anchors.
1862 */
1863static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1864 struct kernel_lb_addr *fileset)
1865{
1866 sector_t last[6];
1867 int i;
1868 struct udf_sb_info *sbi = UDF_SB(sb);
1869 int last_count = 0;
1870 int ret;
1871
1872 /* First try user provided anchor */
1873 if (sbi->s_anchor) {
1874 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1875 if (ret != -EAGAIN)
1876 return ret;
1877 }
1878 /*
1879 * according to spec, anchor is in either:
1880 * block 256
1881 * lastblock-256
1882 * lastblock
1883 * however, if the disc isn't closed, it could be 512.
1884 */
1885 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1886 if (ret != -EAGAIN)
1887 return ret;
1888 /*
1889 * The trouble is which block is the last one. Drives often misreport
1890 * this so we try various possibilities.
1891 */
1892 last[last_count++] = *lastblock;
1893 if (*lastblock >= 1)
1894 last[last_count++] = *lastblock - 1;
1895 last[last_count++] = *lastblock + 1;
1896 if (*lastblock >= 2)
1897 last[last_count++] = *lastblock - 2;
1898 if (*lastblock >= 150)
1899 last[last_count++] = *lastblock - 150;
1900 if (*lastblock >= 152)
1901 last[last_count++] = *lastblock - 152;
1902
1903 for (i = 0; i < last_count; i++) {
1904 if (last[i] >= i_size_read(sb->s_bdev->bd_inode) >>
1905 sb->s_blocksize_bits)
1906 continue;
1907 ret = udf_check_anchor_block(sb, last[i], fileset);
1908 if (ret != -EAGAIN) {
1909 if (!ret)
1910 *lastblock = last[i];
1911 return ret;
1912 }
1913 if (last[i] < 256)
1914 continue;
1915 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1916 if (ret != -EAGAIN) {
1917 if (!ret)
1918 *lastblock = last[i];
1919 return ret;
1920 }
1921 }
1922
1923 /* Finally try block 512 in case media is open */
1924 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1925}
1926
1927/*
1928 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1929 * area specified by it. The function expects sbi->s_lastblock to be the last
1930 * block on the media.
1931 *
1932 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1933 * was not found.
1934 */
1935static int udf_find_anchor(struct super_block *sb,
1936 struct kernel_lb_addr *fileset)
1937{
1938 struct udf_sb_info *sbi = UDF_SB(sb);
1939 sector_t lastblock = sbi->s_last_block;
1940 int ret;
1941
1942 ret = udf_scan_anchors(sb, &lastblock, fileset);
1943 if (ret != -EAGAIN)
1944 goto out;
1945
1946 /* No anchor found? Try VARCONV conversion of block numbers */
1947 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1948 lastblock = udf_variable_to_fixed(sbi->s_last_block);
1949 /* Firstly, we try to not convert number of the last block */
1950 ret = udf_scan_anchors(sb, &lastblock, fileset);
1951 if (ret != -EAGAIN)
1952 goto out;
1953
1954 lastblock = sbi->s_last_block;
1955 /* Secondly, we try with converted number of the last block */
1956 ret = udf_scan_anchors(sb, &lastblock, fileset);
1957 if (ret < 0) {
1958 /* VARCONV didn't help. Clear it. */
1959 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1960 }
1961out:
1962 if (ret == 0)
1963 sbi->s_last_block = lastblock;
1964 return ret;
1965}
1966
1967/*
1968 * Check Volume Structure Descriptor, find Anchor block and load Volume
1969 * Descriptor Sequence.
1970 *
1971 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1972 * block was not found.
1973 */
1974static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1975 int silent, struct kernel_lb_addr *fileset)
1976{
1977 struct udf_sb_info *sbi = UDF_SB(sb);
1978 int nsr = 0;
1979 int ret;
1980
1981 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1982 if (!silent)
1983 udf_warn(sb, "Bad block size\n");
1984 return -EINVAL;
1985 }
1986 sbi->s_last_block = uopt->lastblock;
1987 if (!uopt->novrs) {
1988 /* Check that it is NSR02 compliant */
1989 nsr = udf_check_vsd(sb);
1990 if (!nsr) {
1991 if (!silent)
1992 udf_warn(sb, "No VRS found\n");
1993 return -EINVAL;
1994 }
1995 if (nsr == -1)
1996 udf_debug("Failed to read sector at offset %d. "
1997 "Assuming open disc. Skipping validity "
1998 "check\n", VSD_FIRST_SECTOR_OFFSET);
1999 if (!sbi->s_last_block)
2000 sbi->s_last_block = udf_get_last_block(sb);
2001 } else {
2002 udf_debug("Validity check skipped because of novrs option\n");
2003 }
2004
2005 /* Look for anchor block and load Volume Descriptor Sequence */
2006 sbi->s_anchor = uopt->anchor;
2007 ret = udf_find_anchor(sb, fileset);
2008 if (ret < 0) {
2009 if (!silent && ret == -EAGAIN)
2010 udf_warn(sb, "No anchor found\n");
2011 return ret;
2012 }
2013 return 0;
2014}
2015
2016static void udf_finalize_lvid(struct logicalVolIntegrityDesc *lvid)
2017{
2018 struct timespec64 ts;
2019
2020 ktime_get_real_ts64(&ts);
2021 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, ts);
2022 lvid->descTag.descCRC = cpu_to_le16(
2023 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2024 le16_to_cpu(lvid->descTag.descCRCLength)));
2025 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2026}
2027
2028static void udf_open_lvid(struct super_block *sb)
2029{
2030 struct udf_sb_info *sbi = UDF_SB(sb);
2031 struct buffer_head *bh = sbi->s_lvid_bh;
2032 struct logicalVolIntegrityDesc *lvid;
2033 struct logicalVolIntegrityDescImpUse *lvidiu;
2034
2035 if (!bh)
2036 return;
2037 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2038 lvidiu = udf_sb_lvidiu(sb);
2039 if (!lvidiu)
2040 return;
2041
2042 mutex_lock(&sbi->s_alloc_mutex);
2043 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2044 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2045 if (le32_to_cpu(lvid->integrityType) == LVID_INTEGRITY_TYPE_CLOSE)
2046 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2047 else
2048 UDF_SET_FLAG(sb, UDF_FLAG_INCONSISTENT);
2049
2050 udf_finalize_lvid(lvid);
2051 mark_buffer_dirty(bh);
2052 sbi->s_lvid_dirty = 0;
2053 mutex_unlock(&sbi->s_alloc_mutex);
2054 /* Make opening of filesystem visible on the media immediately */
2055 sync_dirty_buffer(bh);
2056}
2057
2058static void udf_close_lvid(struct super_block *sb)
2059{
2060 struct udf_sb_info *sbi = UDF_SB(sb);
2061 struct buffer_head *bh = sbi->s_lvid_bh;
2062 struct logicalVolIntegrityDesc *lvid;
2063 struct logicalVolIntegrityDescImpUse *lvidiu;
2064
2065 if (!bh)
2066 return;
2067 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2068 lvidiu = udf_sb_lvidiu(sb);
2069 if (!lvidiu)
2070 return;
2071
2072 mutex_lock(&sbi->s_alloc_mutex);
2073 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2074 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2075 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2076 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2077 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2078 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2079 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2080 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2081 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_INCONSISTENT))
2082 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2083
2084 /*
2085 * We set buffer uptodate unconditionally here to avoid spurious
2086 * warnings from mark_buffer_dirty() when previous EIO has marked
2087 * the buffer as !uptodate
2088 */
2089 set_buffer_uptodate(bh);
2090 udf_finalize_lvid(lvid);
2091 mark_buffer_dirty(bh);
2092 sbi->s_lvid_dirty = 0;
2093 mutex_unlock(&sbi->s_alloc_mutex);
2094 /* Make closing of filesystem visible on the media immediately */
2095 sync_dirty_buffer(bh);
2096}
2097
2098u64 lvid_get_unique_id(struct super_block *sb)
2099{
2100 struct buffer_head *bh;
2101 struct udf_sb_info *sbi = UDF_SB(sb);
2102 struct logicalVolIntegrityDesc *lvid;
2103 struct logicalVolHeaderDesc *lvhd;
2104 u64 uniqueID;
2105 u64 ret;
2106
2107 bh = sbi->s_lvid_bh;
2108 if (!bh)
2109 return 0;
2110
2111 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2112 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2113
2114 mutex_lock(&sbi->s_alloc_mutex);
2115 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2116 if (!(++uniqueID & 0xFFFFFFFF))
2117 uniqueID += 16;
2118 lvhd->uniqueID = cpu_to_le64(uniqueID);
2119 udf_updated_lvid(sb);
2120 mutex_unlock(&sbi->s_alloc_mutex);
2121
2122 return ret;
2123}
2124
2125static int udf_fill_super(struct super_block *sb, void *options, int silent)
2126{
2127 int ret = -EINVAL;
2128 struct inode *inode = NULL;
2129 struct udf_options uopt;
2130 struct kernel_lb_addr rootdir, fileset;
2131 struct udf_sb_info *sbi;
2132 bool lvid_open = false;
2133
2134 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2135 /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
2136 uopt.uid = make_kuid(current_user_ns(), overflowuid);
2137 uopt.gid = make_kgid(current_user_ns(), overflowgid);
2138 uopt.umask = 0;
2139 uopt.fmode = UDF_INVALID_MODE;
2140 uopt.dmode = UDF_INVALID_MODE;
2141 uopt.nls_map = NULL;
2142
2143 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2144 if (!sbi)
2145 return -ENOMEM;
2146
2147 sb->s_fs_info = sbi;
2148
2149 mutex_init(&sbi->s_alloc_mutex);
2150
2151 if (!udf_parse_options((char *)options, &uopt, false))
2152 goto parse_options_failure;
2153
2154 fileset.logicalBlockNum = 0xFFFFFFFF;
2155 fileset.partitionReferenceNum = 0xFFFF;
2156
2157 sbi->s_flags = uopt.flags;
2158 sbi->s_uid = uopt.uid;
2159 sbi->s_gid = uopt.gid;
2160 sbi->s_umask = uopt.umask;
2161 sbi->s_fmode = uopt.fmode;
2162 sbi->s_dmode = uopt.dmode;
2163 sbi->s_nls_map = uopt.nls_map;
2164 rwlock_init(&sbi->s_cred_lock);
2165
2166 if (uopt.session == 0xFFFFFFFF)
2167 sbi->s_session = udf_get_last_session(sb);
2168 else
2169 sbi->s_session = uopt.session;
2170
2171 udf_debug("Multi-session=%d\n", sbi->s_session);
2172
2173 /* Fill in the rest of the superblock */
2174 sb->s_op = &udf_sb_ops;
2175 sb->s_export_op = &udf_export_ops;
2176
2177 sb->s_magic = UDF_SUPER_MAGIC;
2178 sb->s_time_gran = 1000;
2179
2180 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2181 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2182 } else {
2183 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2184 while (uopt.blocksize <= 4096) {
2185 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2186 if (ret < 0) {
2187 if (!silent && ret != -EACCES) {
2188 pr_notice("Scanning with blocksize %u failed\n",
2189 uopt.blocksize);
2190 }
2191 brelse(sbi->s_lvid_bh);
2192 sbi->s_lvid_bh = NULL;
2193 /*
2194 * EACCES is special - we want to propagate to
2195 * upper layers that we cannot handle RW mount.
2196 */
2197 if (ret == -EACCES)
2198 break;
2199 } else
2200 break;
2201
2202 uopt.blocksize <<= 1;
2203 }
2204 }
2205 if (ret < 0) {
2206 if (ret == -EAGAIN) {
2207 udf_warn(sb, "No partition found (1)\n");
2208 ret = -EINVAL;
2209 }
2210 goto error_out;
2211 }
2212
2213 udf_debug("Lastblock=%u\n", sbi->s_last_block);
2214
2215 if (sbi->s_lvid_bh) {
2216 struct logicalVolIntegrityDescImpUse *lvidiu =
2217 udf_sb_lvidiu(sb);
2218 uint16_t minUDFReadRev;
2219 uint16_t minUDFWriteRev;
2220
2221 if (!lvidiu) {
2222 ret = -EINVAL;
2223 goto error_out;
2224 }
2225 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2226 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2227 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2228 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2229 minUDFReadRev,
2230 UDF_MAX_READ_VERSION);
2231 ret = -EINVAL;
2232 goto error_out;
2233 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
2234 if (!sb_rdonly(sb)) {
2235 ret = -EACCES;
2236 goto error_out;
2237 }
2238 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2239 }
2240
2241 sbi->s_udfrev = minUDFWriteRev;
2242
2243 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2244 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2245 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2246 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2247 }
2248
2249 if (!sbi->s_partitions) {
2250 udf_warn(sb, "No partition found (2)\n");
2251 ret = -EINVAL;
2252 goto error_out;
2253 }
2254
2255 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2256 UDF_PART_FLAG_READ_ONLY) {
2257 if (!sb_rdonly(sb)) {
2258 ret = -EACCES;
2259 goto error_out;
2260 }
2261 UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
2262 }
2263
2264 ret = udf_find_fileset(sb, &fileset, &rootdir);
2265 if (ret < 0) {
2266 udf_warn(sb, "No fileset found\n");
2267 goto error_out;
2268 }
2269
2270 if (!silent) {
2271 struct timestamp ts;
2272 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2273 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2274 sbi->s_volume_ident,
2275 le16_to_cpu(ts.year), ts.month, ts.day,
2276 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2277 }
2278 if (!sb_rdonly(sb)) {
2279 udf_open_lvid(sb);
2280 lvid_open = true;
2281 }
2282
2283 /* Assign the root inode */
2284 /* assign inodes by physical block number */
2285 /* perhaps it's not extensible enough, but for now ... */
2286 inode = udf_iget(sb, &rootdir);
2287 if (IS_ERR(inode)) {
2288 udf_err(sb, "Error in udf_iget, block=%u, partition=%u\n",
2289 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2290 ret = PTR_ERR(inode);
2291 goto error_out;
2292 }
2293
2294 /* Allocate a dentry for the root inode */
2295 sb->s_root = d_make_root(inode);
2296 if (!sb->s_root) {
2297 udf_err(sb, "Couldn't allocate root dentry\n");
2298 ret = -ENOMEM;
2299 goto error_out;
2300 }
2301 sb->s_maxbytes = MAX_LFS_FILESIZE;
2302 sb->s_max_links = UDF_MAX_LINKS;
2303 return 0;
2304
2305error_out:
2306 iput(sbi->s_vat_inode);
2307parse_options_failure:
2308 unload_nls(uopt.nls_map);
2309 if (lvid_open)
2310 udf_close_lvid(sb);
2311 brelse(sbi->s_lvid_bh);
2312 udf_sb_free_partitions(sb);
2313 kfree(sbi);
2314 sb->s_fs_info = NULL;
2315
2316 return ret;
2317}
2318
2319void _udf_err(struct super_block *sb, const char *function,
2320 const char *fmt, ...)
2321{
2322 struct va_format vaf;
2323 va_list args;
2324
2325 va_start(args, fmt);
2326
2327 vaf.fmt = fmt;
2328 vaf.va = &args;
2329
2330 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2331
2332 va_end(args);
2333}
2334
2335void _udf_warn(struct super_block *sb, const char *function,
2336 const char *fmt, ...)
2337{
2338 struct va_format vaf;
2339 va_list args;
2340
2341 va_start(args, fmt);
2342
2343 vaf.fmt = fmt;
2344 vaf.va = &args;
2345
2346 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2347
2348 va_end(args);
2349}
2350
2351static void udf_put_super(struct super_block *sb)
2352{
2353 struct udf_sb_info *sbi;
2354
2355 sbi = UDF_SB(sb);
2356
2357 iput(sbi->s_vat_inode);
2358 unload_nls(sbi->s_nls_map);
2359 if (!sb_rdonly(sb))
2360 udf_close_lvid(sb);
2361 brelse(sbi->s_lvid_bh);
2362 udf_sb_free_partitions(sb);
2363 mutex_destroy(&sbi->s_alloc_mutex);
2364 kfree(sb->s_fs_info);
2365 sb->s_fs_info = NULL;
2366}
2367
2368static int udf_sync_fs(struct super_block *sb, int wait)
2369{
2370 struct udf_sb_info *sbi = UDF_SB(sb);
2371
2372 mutex_lock(&sbi->s_alloc_mutex);
2373 if (sbi->s_lvid_dirty) {
2374 struct buffer_head *bh = sbi->s_lvid_bh;
2375 struct logicalVolIntegrityDesc *lvid;
2376
2377 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2378 udf_finalize_lvid(lvid);
2379
2380 /*
2381 * Blockdevice will be synced later so we don't have to submit
2382 * the buffer for IO
2383 */
2384 mark_buffer_dirty(bh);
2385 sbi->s_lvid_dirty = 0;
2386 }
2387 mutex_unlock(&sbi->s_alloc_mutex);
2388
2389 return 0;
2390}
2391
2392static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2393{
2394 struct super_block *sb = dentry->d_sb;
2395 struct udf_sb_info *sbi = UDF_SB(sb);
2396 struct logicalVolIntegrityDescImpUse *lvidiu;
2397 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2398
2399 lvidiu = udf_sb_lvidiu(sb);
2400 buf->f_type = UDF_SUPER_MAGIC;
2401 buf->f_bsize = sb->s_blocksize;
2402 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2403 buf->f_bfree = udf_count_free(sb);
2404 buf->f_bavail = buf->f_bfree;
2405 /*
2406 * Let's pretend each free block is also a free 'inode' since UDF does
2407 * not have separate preallocated table of inodes.
2408 */
2409 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2410 le32_to_cpu(lvidiu->numDirs)) : 0)
2411 + buf->f_bfree;
2412 buf->f_ffree = buf->f_bfree;
2413 buf->f_namelen = UDF_NAME_LEN;
2414 buf->f_fsid = u64_to_fsid(id);
2415
2416 return 0;
2417}
2418
2419static unsigned int udf_count_free_bitmap(struct super_block *sb,
2420 struct udf_bitmap *bitmap)
2421{
2422 struct buffer_head *bh = NULL;
2423 unsigned int accum = 0;
2424 int index;
2425 udf_pblk_t block = 0, newblock;
2426 struct kernel_lb_addr loc;
2427 uint32_t bytes;
2428 uint8_t *ptr;
2429 uint16_t ident;
2430 struct spaceBitmapDesc *bm;
2431
2432 loc.logicalBlockNum = bitmap->s_extPosition;
2433 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2434 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2435
2436 if (!bh) {
2437 udf_err(sb, "udf_count_free failed\n");
2438 goto out;
2439 } else if (ident != TAG_IDENT_SBD) {
2440 brelse(bh);
2441 udf_err(sb, "udf_count_free failed\n");
2442 goto out;
2443 }
2444
2445 bm = (struct spaceBitmapDesc *)bh->b_data;
2446 bytes = le32_to_cpu(bm->numOfBytes);
2447 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2448 ptr = (uint8_t *)bh->b_data;
2449
2450 while (bytes > 0) {
2451 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2452 accum += bitmap_weight((const unsigned long *)(ptr + index),
2453 cur_bytes * 8);
2454 bytes -= cur_bytes;
2455 if (bytes) {
2456 brelse(bh);
2457 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2458 bh = udf_tread(sb, newblock);
2459 if (!bh) {
2460 udf_debug("read failed\n");
2461 goto out;
2462 }
2463 index = 0;
2464 ptr = (uint8_t *)bh->b_data;
2465 }
2466 }
2467 brelse(bh);
2468out:
2469 return accum;
2470}
2471
2472static unsigned int udf_count_free_table(struct super_block *sb,
2473 struct inode *table)
2474{
2475 unsigned int accum = 0;
2476 uint32_t elen;
2477 struct kernel_lb_addr eloc;
2478 int8_t etype;
2479 struct extent_position epos;
2480
2481 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2482 epos.block = UDF_I(table)->i_location;
2483 epos.offset = sizeof(struct unallocSpaceEntry);
2484 epos.bh = NULL;
2485
2486 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2487 accum += (elen >> table->i_sb->s_blocksize_bits);
2488
2489 brelse(epos.bh);
2490 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2491
2492 return accum;
2493}
2494
2495static unsigned int udf_count_free(struct super_block *sb)
2496{
2497 unsigned int accum = 0;
2498 struct udf_sb_info *sbi = UDF_SB(sb);
2499 struct udf_part_map *map;
2500 unsigned int part = sbi->s_partition;
2501 int ptype = sbi->s_partmaps[part].s_partition_type;
2502
2503 if (ptype == UDF_METADATA_MAP25) {
2504 part = sbi->s_partmaps[part].s_type_specific.s_metadata.
2505 s_phys_partition_ref;
2506 } else if (ptype == UDF_VIRTUAL_MAP15 || ptype == UDF_VIRTUAL_MAP20) {
2507 /*
2508 * Filesystems with VAT are append-only and we cannot write to
2509 * them. Let's just report 0 here.
2510 */
2511 return 0;
2512 }
2513
2514 if (sbi->s_lvid_bh) {
2515 struct logicalVolIntegrityDesc *lvid =
2516 (struct logicalVolIntegrityDesc *)
2517 sbi->s_lvid_bh->b_data;
2518 if (le32_to_cpu(lvid->numOfPartitions) > part) {
2519 accum = le32_to_cpu(
2520 lvid->freeSpaceTable[part]);
2521 if (accum == 0xFFFFFFFF)
2522 accum = 0;
2523 }
2524 }
2525
2526 if (accum)
2527 return accum;
2528
2529 map = &sbi->s_partmaps[part];
2530 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2531 accum += udf_count_free_bitmap(sb,
2532 map->s_uspace.s_bitmap);
2533 }
2534 if (accum)
2535 return accum;
2536
2537 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2538 accum += udf_count_free_table(sb,
2539 map->s_uspace.s_table);
2540 }
2541 return accum;
2542}
2543
2544MODULE_AUTHOR("Ben Fennema");
2545MODULE_DESCRIPTION("Universal Disk Format Filesystem");
2546MODULE_LICENSE("GPL");
2547module_init(init_udf_fs)
2548module_exit(exit_udf_fs)
1/*
2 * super.c
3 *
4 * PURPOSE
5 * Super block routines for the OSTA-UDF(tm) filesystem.
6 *
7 * DESCRIPTION
8 * OSTA-UDF(tm) = Optical Storage Technology Association
9 * Universal Disk Format.
10 *
11 * This code is based on version 2.00 of the UDF specification,
12 * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13 * http://www.osta.org/
14 * http://www.ecma.ch/
15 * http://www.iso.org/
16 *
17 * COPYRIGHT
18 * This file is distributed under the terms of the GNU General Public
19 * License (GPL). Copies of the GPL can be obtained from:
20 * ftp://prep.ai.mit.edu/pub/gnu/GPL
21 * Each contributing author retains all rights to their own work.
22 *
23 * (C) 1998 Dave Boynton
24 * (C) 1998-2004 Ben Fennema
25 * (C) 2000 Stelias Computing Inc
26 *
27 * HISTORY
28 *
29 * 09/24/98 dgb changed to allow compiling outside of kernel, and
30 * added some debugging.
31 * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
32 * 10/16/98 attempting some multi-session support
33 * 10/17/98 added freespace count for "df"
34 * 11/11/98 gr added novrs option
35 * 11/26/98 dgb added fileset,anchor mount options
36 * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
37 * vol descs. rewrote option handling based on isofs
38 * 12/20/98 find the free space bitmap (if it exists)
39 */
40
41#include "udfdecl.h"
42
43#include <linux/blkdev.h>
44#include <linux/slab.h>
45#include <linux/kernel.h>
46#include <linux/module.h>
47#include <linux/parser.h>
48#include <linux/stat.h>
49#include <linux/cdrom.h>
50#include <linux/nls.h>
51#include <linux/vfs.h>
52#include <linux/vmalloc.h>
53#include <linux/errno.h>
54#include <linux/mount.h>
55#include <linux/seq_file.h>
56#include <linux/bitmap.h>
57#include <linux/crc-itu-t.h>
58#include <linux/log2.h>
59#include <asm/byteorder.h>
60
61#include "udf_sb.h"
62#include "udf_i.h"
63
64#include <linux/init.h>
65#include <linux/uaccess.h>
66
67#define VDS_POS_PRIMARY_VOL_DESC 0
68#define VDS_POS_UNALLOC_SPACE_DESC 1
69#define VDS_POS_LOGICAL_VOL_DESC 2
70#define VDS_POS_PARTITION_DESC 3
71#define VDS_POS_IMP_USE_VOL_DESC 4
72#define VDS_POS_VOL_DESC_PTR 5
73#define VDS_POS_TERMINATING_DESC 6
74#define VDS_POS_LENGTH 7
75
76#define UDF_DEFAULT_BLOCKSIZE 2048
77
78#define VSD_FIRST_SECTOR_OFFSET 32768
79#define VSD_MAX_SECTOR_OFFSET 0x800000
80
81/*
82 * Maximum number of Terminating Descriptor / Logical Volume Integrity
83 * Descriptor redirections. The chosen numbers are arbitrary - just that we
84 * hopefully don't limit any real use of rewritten inode on write-once media
85 * but avoid looping for too long on corrupted media.
86 */
87#define UDF_MAX_TD_NESTING 64
88#define UDF_MAX_LVID_NESTING 1000
89
90enum { UDF_MAX_LINKS = 0xffff };
91
92/* These are the "meat" - everything else is stuffing */
93static int udf_fill_super(struct super_block *, void *, int);
94static void udf_put_super(struct super_block *);
95static int udf_sync_fs(struct super_block *, int);
96static int udf_remount_fs(struct super_block *, int *, char *);
97static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
98static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
99 struct kernel_lb_addr *);
100static void udf_load_fileset(struct super_block *, struct buffer_head *,
101 struct kernel_lb_addr *);
102static void udf_open_lvid(struct super_block *);
103static void udf_close_lvid(struct super_block *);
104static unsigned int udf_count_free(struct super_block *);
105static int udf_statfs(struct dentry *, struct kstatfs *);
106static int udf_show_options(struct seq_file *, struct dentry *);
107
108struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
109{
110 struct logicalVolIntegrityDesc *lvid;
111 unsigned int partnum;
112 unsigned int offset;
113
114 if (!UDF_SB(sb)->s_lvid_bh)
115 return NULL;
116 lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
117 partnum = le32_to_cpu(lvid->numOfPartitions);
118 if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
119 offsetof(struct logicalVolIntegrityDesc, impUse)) /
120 (2 * sizeof(uint32_t)) < partnum) {
121 udf_err(sb, "Logical volume integrity descriptor corrupted "
122 "(numOfPartitions = %u)!\n", partnum);
123 return NULL;
124 }
125 /* The offset is to skip freeSpaceTable and sizeTable arrays */
126 offset = partnum * 2 * sizeof(uint32_t);
127 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
128}
129
130/* UDF filesystem type */
131static struct dentry *udf_mount(struct file_system_type *fs_type,
132 int flags, const char *dev_name, void *data)
133{
134 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
135}
136
137static struct file_system_type udf_fstype = {
138 .owner = THIS_MODULE,
139 .name = "udf",
140 .mount = udf_mount,
141 .kill_sb = kill_block_super,
142 .fs_flags = FS_REQUIRES_DEV,
143};
144MODULE_ALIAS_FS("udf");
145
146static struct kmem_cache *udf_inode_cachep;
147
148static struct inode *udf_alloc_inode(struct super_block *sb)
149{
150 struct udf_inode_info *ei;
151 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
152 if (!ei)
153 return NULL;
154
155 ei->i_unique = 0;
156 ei->i_lenExtents = 0;
157 ei->i_next_alloc_block = 0;
158 ei->i_next_alloc_goal = 0;
159 ei->i_strat4096 = 0;
160 init_rwsem(&ei->i_data_sem);
161 ei->cached_extent.lstart = -1;
162 spin_lock_init(&ei->i_extent_cache_lock);
163
164 return &ei->vfs_inode;
165}
166
167static void udf_i_callback(struct rcu_head *head)
168{
169 struct inode *inode = container_of(head, struct inode, i_rcu);
170 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
171}
172
173static void udf_destroy_inode(struct inode *inode)
174{
175 call_rcu(&inode->i_rcu, udf_i_callback);
176}
177
178static void init_once(void *foo)
179{
180 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
181
182 ei->i_ext.i_data = NULL;
183 inode_init_once(&ei->vfs_inode);
184}
185
186static int __init init_inodecache(void)
187{
188 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
189 sizeof(struct udf_inode_info),
190 0, (SLAB_RECLAIM_ACCOUNT |
191 SLAB_MEM_SPREAD |
192 SLAB_ACCOUNT),
193 init_once);
194 if (!udf_inode_cachep)
195 return -ENOMEM;
196 return 0;
197}
198
199static void destroy_inodecache(void)
200{
201 /*
202 * Make sure all delayed rcu free inodes are flushed before we
203 * destroy cache.
204 */
205 rcu_barrier();
206 kmem_cache_destroy(udf_inode_cachep);
207}
208
209/* Superblock operations */
210static const struct super_operations udf_sb_ops = {
211 .alloc_inode = udf_alloc_inode,
212 .destroy_inode = udf_destroy_inode,
213 .write_inode = udf_write_inode,
214 .evict_inode = udf_evict_inode,
215 .put_super = udf_put_super,
216 .sync_fs = udf_sync_fs,
217 .statfs = udf_statfs,
218 .remount_fs = udf_remount_fs,
219 .show_options = udf_show_options,
220};
221
222struct udf_options {
223 unsigned char novrs;
224 unsigned int blocksize;
225 unsigned int session;
226 unsigned int lastblock;
227 unsigned int anchor;
228 unsigned int volume;
229 unsigned short partition;
230 unsigned int fileset;
231 unsigned int rootdir;
232 unsigned int flags;
233 umode_t umask;
234 kgid_t gid;
235 kuid_t uid;
236 umode_t fmode;
237 umode_t dmode;
238 struct nls_table *nls_map;
239};
240
241static int __init init_udf_fs(void)
242{
243 int err;
244
245 err = init_inodecache();
246 if (err)
247 goto out1;
248 err = register_filesystem(&udf_fstype);
249 if (err)
250 goto out;
251
252 return 0;
253
254out:
255 destroy_inodecache();
256
257out1:
258 return err;
259}
260
261static void __exit exit_udf_fs(void)
262{
263 unregister_filesystem(&udf_fstype);
264 destroy_inodecache();
265}
266
267module_init(init_udf_fs)
268module_exit(exit_udf_fs)
269
270static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
271{
272 struct udf_sb_info *sbi = UDF_SB(sb);
273
274 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
275 GFP_KERNEL);
276 if (!sbi->s_partmaps) {
277 udf_err(sb, "Unable to allocate space for %d partition maps\n",
278 count);
279 sbi->s_partitions = 0;
280 return -ENOMEM;
281 }
282
283 sbi->s_partitions = count;
284 return 0;
285}
286
287static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
288{
289 int i;
290 int nr_groups = bitmap->s_nr_groups;
291
292 for (i = 0; i < nr_groups; i++)
293 if (bitmap->s_block_bitmap[i])
294 brelse(bitmap->s_block_bitmap[i]);
295
296 kvfree(bitmap);
297}
298
299static void udf_free_partition(struct udf_part_map *map)
300{
301 int i;
302 struct udf_meta_data *mdata;
303
304 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
305 iput(map->s_uspace.s_table);
306 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
307 iput(map->s_fspace.s_table);
308 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
309 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
310 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
311 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
312 if (map->s_partition_type == UDF_SPARABLE_MAP15)
313 for (i = 0; i < 4; i++)
314 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
315 else if (map->s_partition_type == UDF_METADATA_MAP25) {
316 mdata = &map->s_type_specific.s_metadata;
317 iput(mdata->s_metadata_fe);
318 mdata->s_metadata_fe = NULL;
319
320 iput(mdata->s_mirror_fe);
321 mdata->s_mirror_fe = NULL;
322
323 iput(mdata->s_bitmap_fe);
324 mdata->s_bitmap_fe = NULL;
325 }
326}
327
328static void udf_sb_free_partitions(struct super_block *sb)
329{
330 struct udf_sb_info *sbi = UDF_SB(sb);
331 int i;
332 if (sbi->s_partmaps == NULL)
333 return;
334 for (i = 0; i < sbi->s_partitions; i++)
335 udf_free_partition(&sbi->s_partmaps[i]);
336 kfree(sbi->s_partmaps);
337 sbi->s_partmaps = NULL;
338}
339
340static int udf_show_options(struct seq_file *seq, struct dentry *root)
341{
342 struct super_block *sb = root->d_sb;
343 struct udf_sb_info *sbi = UDF_SB(sb);
344
345 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
346 seq_puts(seq, ",nostrict");
347 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
348 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
349 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
350 seq_puts(seq, ",unhide");
351 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
352 seq_puts(seq, ",undelete");
353 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
354 seq_puts(seq, ",noadinicb");
355 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
356 seq_puts(seq, ",shortad");
357 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
358 seq_puts(seq, ",uid=forget");
359 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
360 seq_puts(seq, ",uid=ignore");
361 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
362 seq_puts(seq, ",gid=forget");
363 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
364 seq_puts(seq, ",gid=ignore");
365 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
366 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
367 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
368 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
369 if (sbi->s_umask != 0)
370 seq_printf(seq, ",umask=%ho", sbi->s_umask);
371 if (sbi->s_fmode != UDF_INVALID_MODE)
372 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
373 if (sbi->s_dmode != UDF_INVALID_MODE)
374 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
375 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
376 seq_printf(seq, ",session=%u", sbi->s_session);
377 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
378 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
379 if (sbi->s_anchor != 0)
380 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
381 /*
382 * volume, partition, fileset and rootdir seem to be ignored
383 * currently
384 */
385 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
386 seq_puts(seq, ",utf8");
387 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
388 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
389
390 return 0;
391}
392
393/*
394 * udf_parse_options
395 *
396 * PURPOSE
397 * Parse mount options.
398 *
399 * DESCRIPTION
400 * The following mount options are supported:
401 *
402 * gid= Set the default group.
403 * umask= Set the default umask.
404 * mode= Set the default file permissions.
405 * dmode= Set the default directory permissions.
406 * uid= Set the default user.
407 * bs= Set the block size.
408 * unhide Show otherwise hidden files.
409 * undelete Show deleted files in lists.
410 * adinicb Embed data in the inode (default)
411 * noadinicb Don't embed data in the inode
412 * shortad Use short ad's
413 * longad Use long ad's (default)
414 * nostrict Unset strict conformance
415 * iocharset= Set the NLS character set
416 *
417 * The remaining are for debugging and disaster recovery:
418 *
419 * novrs Skip volume sequence recognition
420 *
421 * The following expect a offset from 0.
422 *
423 * session= Set the CDROM session (default= last session)
424 * anchor= Override standard anchor location. (default= 256)
425 * volume= Override the VolumeDesc location. (unused)
426 * partition= Override the PartitionDesc location. (unused)
427 * lastblock= Set the last block of the filesystem/
428 *
429 * The following expect a offset from the partition root.
430 *
431 * fileset= Override the fileset block location. (unused)
432 * rootdir= Override the root directory location. (unused)
433 * WARNING: overriding the rootdir to a non-directory may
434 * yield highly unpredictable results.
435 *
436 * PRE-CONDITIONS
437 * options Pointer to mount options string.
438 * uopts Pointer to mount options variable.
439 *
440 * POST-CONDITIONS
441 * <return> 1 Mount options parsed okay.
442 * <return> 0 Error parsing mount options.
443 *
444 * HISTORY
445 * July 1, 1997 - Andrew E. Mileski
446 * Written, tested, and released.
447 */
448
449enum {
450 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
451 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
452 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
453 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
454 Opt_rootdir, Opt_utf8, Opt_iocharset,
455 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
456 Opt_fmode, Opt_dmode
457};
458
459static const match_table_t tokens = {
460 {Opt_novrs, "novrs"},
461 {Opt_nostrict, "nostrict"},
462 {Opt_bs, "bs=%u"},
463 {Opt_unhide, "unhide"},
464 {Opt_undelete, "undelete"},
465 {Opt_noadinicb, "noadinicb"},
466 {Opt_adinicb, "adinicb"},
467 {Opt_shortad, "shortad"},
468 {Opt_longad, "longad"},
469 {Opt_uforget, "uid=forget"},
470 {Opt_uignore, "uid=ignore"},
471 {Opt_gforget, "gid=forget"},
472 {Opt_gignore, "gid=ignore"},
473 {Opt_gid, "gid=%u"},
474 {Opt_uid, "uid=%u"},
475 {Opt_umask, "umask=%o"},
476 {Opt_session, "session=%u"},
477 {Opt_lastblock, "lastblock=%u"},
478 {Opt_anchor, "anchor=%u"},
479 {Opt_volume, "volume=%u"},
480 {Opt_partition, "partition=%u"},
481 {Opt_fileset, "fileset=%u"},
482 {Opt_rootdir, "rootdir=%u"},
483 {Opt_utf8, "utf8"},
484 {Opt_iocharset, "iocharset=%s"},
485 {Opt_fmode, "mode=%o"},
486 {Opt_dmode, "dmode=%o"},
487 {Opt_err, NULL}
488};
489
490static int udf_parse_options(char *options, struct udf_options *uopt,
491 bool remount)
492{
493 char *p;
494 int option;
495
496 uopt->novrs = 0;
497 uopt->partition = 0xFFFF;
498 uopt->session = 0xFFFFFFFF;
499 uopt->lastblock = 0;
500 uopt->anchor = 0;
501 uopt->volume = 0xFFFFFFFF;
502 uopt->rootdir = 0xFFFFFFFF;
503 uopt->fileset = 0xFFFFFFFF;
504 uopt->nls_map = NULL;
505
506 if (!options)
507 return 1;
508
509 while ((p = strsep(&options, ",")) != NULL) {
510 substring_t args[MAX_OPT_ARGS];
511 int token;
512 unsigned n;
513 if (!*p)
514 continue;
515
516 token = match_token(p, tokens, args);
517 switch (token) {
518 case Opt_novrs:
519 uopt->novrs = 1;
520 break;
521 case Opt_bs:
522 if (match_int(&args[0], &option))
523 return 0;
524 n = option;
525 if (n != 512 && n != 1024 && n != 2048 && n != 4096)
526 return 0;
527 uopt->blocksize = n;
528 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
529 break;
530 case Opt_unhide:
531 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
532 break;
533 case Opt_undelete:
534 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
535 break;
536 case Opt_noadinicb:
537 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
538 break;
539 case Opt_adinicb:
540 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
541 break;
542 case Opt_shortad:
543 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
544 break;
545 case Opt_longad:
546 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
547 break;
548 case Opt_gid:
549 if (match_int(args, &option))
550 return 0;
551 uopt->gid = make_kgid(current_user_ns(), option);
552 if (!gid_valid(uopt->gid))
553 return 0;
554 uopt->flags |= (1 << UDF_FLAG_GID_SET);
555 break;
556 case Opt_uid:
557 if (match_int(args, &option))
558 return 0;
559 uopt->uid = make_kuid(current_user_ns(), option);
560 if (!uid_valid(uopt->uid))
561 return 0;
562 uopt->flags |= (1 << UDF_FLAG_UID_SET);
563 break;
564 case Opt_umask:
565 if (match_octal(args, &option))
566 return 0;
567 uopt->umask = option;
568 break;
569 case Opt_nostrict:
570 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
571 break;
572 case Opt_session:
573 if (match_int(args, &option))
574 return 0;
575 uopt->session = option;
576 if (!remount)
577 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
578 break;
579 case Opt_lastblock:
580 if (match_int(args, &option))
581 return 0;
582 uopt->lastblock = option;
583 if (!remount)
584 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
585 break;
586 case Opt_anchor:
587 if (match_int(args, &option))
588 return 0;
589 uopt->anchor = option;
590 break;
591 case Opt_volume:
592 if (match_int(args, &option))
593 return 0;
594 uopt->volume = option;
595 break;
596 case Opt_partition:
597 if (match_int(args, &option))
598 return 0;
599 uopt->partition = option;
600 break;
601 case Opt_fileset:
602 if (match_int(args, &option))
603 return 0;
604 uopt->fileset = option;
605 break;
606 case Opt_rootdir:
607 if (match_int(args, &option))
608 return 0;
609 uopt->rootdir = option;
610 break;
611 case Opt_utf8:
612 uopt->flags |= (1 << UDF_FLAG_UTF8);
613 break;
614#ifdef CONFIG_UDF_NLS
615 case Opt_iocharset:
616 uopt->nls_map = load_nls(args[0].from);
617 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
618 break;
619#endif
620 case Opt_uignore:
621 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
622 break;
623 case Opt_uforget:
624 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
625 break;
626 case Opt_gignore:
627 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
628 break;
629 case Opt_gforget:
630 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
631 break;
632 case Opt_fmode:
633 if (match_octal(args, &option))
634 return 0;
635 uopt->fmode = option & 0777;
636 break;
637 case Opt_dmode:
638 if (match_octal(args, &option))
639 return 0;
640 uopt->dmode = option & 0777;
641 break;
642 default:
643 pr_err("bad mount option \"%s\" or missing value\n", p);
644 return 0;
645 }
646 }
647 return 1;
648}
649
650static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
651{
652 struct udf_options uopt;
653 struct udf_sb_info *sbi = UDF_SB(sb);
654 int error = 0;
655 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
656
657 sync_filesystem(sb);
658 if (lvidiu) {
659 int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
660 if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
661 return -EACCES;
662 }
663
664 uopt.flags = sbi->s_flags;
665 uopt.uid = sbi->s_uid;
666 uopt.gid = sbi->s_gid;
667 uopt.umask = sbi->s_umask;
668 uopt.fmode = sbi->s_fmode;
669 uopt.dmode = sbi->s_dmode;
670
671 if (!udf_parse_options(options, &uopt, true))
672 return -EINVAL;
673
674 write_lock(&sbi->s_cred_lock);
675 sbi->s_flags = uopt.flags;
676 sbi->s_uid = uopt.uid;
677 sbi->s_gid = uopt.gid;
678 sbi->s_umask = uopt.umask;
679 sbi->s_fmode = uopt.fmode;
680 sbi->s_dmode = uopt.dmode;
681 write_unlock(&sbi->s_cred_lock);
682
683 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
684 goto out_unlock;
685
686 if (*flags & MS_RDONLY)
687 udf_close_lvid(sb);
688 else
689 udf_open_lvid(sb);
690
691out_unlock:
692 return error;
693}
694
695/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
696/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
697static loff_t udf_check_vsd(struct super_block *sb)
698{
699 struct volStructDesc *vsd = NULL;
700 loff_t sector = VSD_FIRST_SECTOR_OFFSET;
701 int sectorsize;
702 struct buffer_head *bh = NULL;
703 int nsr02 = 0;
704 int nsr03 = 0;
705 struct udf_sb_info *sbi;
706
707 sbi = UDF_SB(sb);
708 if (sb->s_blocksize < sizeof(struct volStructDesc))
709 sectorsize = sizeof(struct volStructDesc);
710 else
711 sectorsize = sb->s_blocksize;
712
713 sector += (sbi->s_session << sb->s_blocksize_bits);
714
715 udf_debug("Starting at sector %u (%ld byte sectors)\n",
716 (unsigned int)(sector >> sb->s_blocksize_bits),
717 sb->s_blocksize);
718 /* Process the sequence (if applicable). The hard limit on the sector
719 * offset is arbitrary, hopefully large enough so that all valid UDF
720 * filesystems will be recognised. There is no mention of an upper
721 * bound to the size of the volume recognition area in the standard.
722 * The limit will prevent the code to read all the sectors of a
723 * specially crafted image (like a bluray disc full of CD001 sectors),
724 * potentially causing minutes or even hours of uninterruptible I/O
725 * activity. This actually happened with uninitialised SSD partitions
726 * (all 0xFF) before the check for the limit and all valid IDs were
727 * added */
728 for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
729 sector += sectorsize) {
730 /* Read a block */
731 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
732 if (!bh)
733 break;
734
735 /* Look for ISO descriptors */
736 vsd = (struct volStructDesc *)(bh->b_data +
737 (sector & (sb->s_blocksize - 1)));
738
739 if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
740 VSD_STD_ID_LEN)) {
741 switch (vsd->structType) {
742 case 0:
743 udf_debug("ISO9660 Boot Record found\n");
744 break;
745 case 1:
746 udf_debug("ISO9660 Primary Volume Descriptor found\n");
747 break;
748 case 2:
749 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
750 break;
751 case 3:
752 udf_debug("ISO9660 Volume Partition Descriptor found\n");
753 break;
754 case 255:
755 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
756 break;
757 default:
758 udf_debug("ISO9660 VRS (%u) found\n",
759 vsd->structType);
760 break;
761 }
762 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
763 VSD_STD_ID_LEN))
764 ; /* nothing */
765 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
766 VSD_STD_ID_LEN)) {
767 brelse(bh);
768 break;
769 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
770 VSD_STD_ID_LEN))
771 nsr02 = sector;
772 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
773 VSD_STD_ID_LEN))
774 nsr03 = sector;
775 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
776 VSD_STD_ID_LEN))
777 ; /* nothing */
778 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
779 VSD_STD_ID_LEN))
780 ; /* nothing */
781 else {
782 /* invalid id : end of volume recognition area */
783 brelse(bh);
784 break;
785 }
786 brelse(bh);
787 }
788
789 if (nsr03)
790 return nsr03;
791 else if (nsr02)
792 return nsr02;
793 else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
794 VSD_FIRST_SECTOR_OFFSET)
795 return -1;
796 else
797 return 0;
798}
799
800static int udf_find_fileset(struct super_block *sb,
801 struct kernel_lb_addr *fileset,
802 struct kernel_lb_addr *root)
803{
804 struct buffer_head *bh = NULL;
805 long lastblock;
806 uint16_t ident;
807 struct udf_sb_info *sbi;
808
809 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
810 fileset->partitionReferenceNum != 0xFFFF) {
811 bh = udf_read_ptagged(sb, fileset, 0, &ident);
812
813 if (!bh) {
814 return 1;
815 } else if (ident != TAG_IDENT_FSD) {
816 brelse(bh);
817 return 1;
818 }
819
820 }
821
822 sbi = UDF_SB(sb);
823 if (!bh) {
824 /* Search backwards through the partitions */
825 struct kernel_lb_addr newfileset;
826
827/* --> cvg: FIXME - is it reasonable? */
828 return 1;
829
830 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
831 (newfileset.partitionReferenceNum != 0xFFFF &&
832 fileset->logicalBlockNum == 0xFFFFFFFF &&
833 fileset->partitionReferenceNum == 0xFFFF);
834 newfileset.partitionReferenceNum--) {
835 lastblock = sbi->s_partmaps
836 [newfileset.partitionReferenceNum]
837 .s_partition_len;
838 newfileset.logicalBlockNum = 0;
839
840 do {
841 bh = udf_read_ptagged(sb, &newfileset, 0,
842 &ident);
843 if (!bh) {
844 newfileset.logicalBlockNum++;
845 continue;
846 }
847
848 switch (ident) {
849 case TAG_IDENT_SBD:
850 {
851 struct spaceBitmapDesc *sp;
852 sp = (struct spaceBitmapDesc *)
853 bh->b_data;
854 newfileset.logicalBlockNum += 1 +
855 ((le32_to_cpu(sp->numOfBytes) +
856 sizeof(struct spaceBitmapDesc)
857 - 1) >> sb->s_blocksize_bits);
858 brelse(bh);
859 break;
860 }
861 case TAG_IDENT_FSD:
862 *fileset = newfileset;
863 break;
864 default:
865 newfileset.logicalBlockNum++;
866 brelse(bh);
867 bh = NULL;
868 break;
869 }
870 } while (newfileset.logicalBlockNum < lastblock &&
871 fileset->logicalBlockNum == 0xFFFFFFFF &&
872 fileset->partitionReferenceNum == 0xFFFF);
873 }
874 }
875
876 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
877 fileset->partitionReferenceNum != 0xFFFF) && bh) {
878 udf_debug("Fileset at block=%d, partition=%d\n",
879 fileset->logicalBlockNum,
880 fileset->partitionReferenceNum);
881
882 sbi->s_partition = fileset->partitionReferenceNum;
883 udf_load_fileset(sb, bh, root);
884 brelse(bh);
885 return 0;
886 }
887 return 1;
888}
889
890/*
891 * Load primary Volume Descriptor Sequence
892 *
893 * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
894 * should be tried.
895 */
896static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
897{
898 struct primaryVolDesc *pvoldesc;
899 uint8_t *outstr;
900 struct buffer_head *bh;
901 uint16_t ident;
902 int ret = -ENOMEM;
903
904 outstr = kmalloc(128, GFP_NOFS);
905 if (!outstr)
906 return -ENOMEM;
907
908 bh = udf_read_tagged(sb, block, block, &ident);
909 if (!bh) {
910 ret = -EAGAIN;
911 goto out2;
912 }
913
914 if (ident != TAG_IDENT_PVD) {
915 ret = -EIO;
916 goto out_bh;
917 }
918
919 pvoldesc = (struct primaryVolDesc *)bh->b_data;
920
921 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
922 pvoldesc->recordingDateAndTime)) {
923#ifdef UDFFS_DEBUG
924 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
925 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
926 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
927 ts->minute, le16_to_cpu(ts->typeAndTimezone));
928#endif
929 }
930
931 ret = udf_dstrCS0toUTF8(outstr, 31, pvoldesc->volIdent, 32);
932 if (ret < 0)
933 goto out_bh;
934
935 strncpy(UDF_SB(sb)->s_volume_ident, outstr, ret);
936 udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
937
938 ret = udf_dstrCS0toUTF8(outstr, 127, pvoldesc->volSetIdent, 128);
939 if (ret < 0)
940 goto out_bh;
941
942 outstr[ret] = 0;
943 udf_debug("volSetIdent[] = '%s'\n", outstr);
944
945 ret = 0;
946out_bh:
947 brelse(bh);
948out2:
949 kfree(outstr);
950 return ret;
951}
952
953struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
954 u32 meta_file_loc, u32 partition_ref)
955{
956 struct kernel_lb_addr addr;
957 struct inode *metadata_fe;
958
959 addr.logicalBlockNum = meta_file_loc;
960 addr.partitionReferenceNum = partition_ref;
961
962 metadata_fe = udf_iget_special(sb, &addr);
963
964 if (IS_ERR(metadata_fe)) {
965 udf_warn(sb, "metadata inode efe not found\n");
966 return metadata_fe;
967 }
968 if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
969 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
970 iput(metadata_fe);
971 return ERR_PTR(-EIO);
972 }
973
974 return metadata_fe;
975}
976
977static int udf_load_metadata_files(struct super_block *sb, int partition,
978 int type1_index)
979{
980 struct udf_sb_info *sbi = UDF_SB(sb);
981 struct udf_part_map *map;
982 struct udf_meta_data *mdata;
983 struct kernel_lb_addr addr;
984 struct inode *fe;
985
986 map = &sbi->s_partmaps[partition];
987 mdata = &map->s_type_specific.s_metadata;
988 mdata->s_phys_partition_ref = type1_index;
989
990 /* metadata address */
991 udf_debug("Metadata file location: block = %d part = %d\n",
992 mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
993
994 fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
995 mdata->s_phys_partition_ref);
996 if (IS_ERR(fe)) {
997 /* mirror file entry */
998 udf_debug("Mirror metadata file location: block = %d part = %d\n",
999 mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
1000
1001 fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
1002 mdata->s_phys_partition_ref);
1003
1004 if (IS_ERR(fe)) {
1005 udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
1006 return PTR_ERR(fe);
1007 }
1008 mdata->s_mirror_fe = fe;
1009 } else
1010 mdata->s_metadata_fe = fe;
1011
1012
1013 /*
1014 * bitmap file entry
1015 * Note:
1016 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
1017 */
1018 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
1019 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
1020 addr.partitionReferenceNum = mdata->s_phys_partition_ref;
1021
1022 udf_debug("Bitmap file location: block = %d part = %d\n",
1023 addr.logicalBlockNum, addr.partitionReferenceNum);
1024
1025 fe = udf_iget_special(sb, &addr);
1026 if (IS_ERR(fe)) {
1027 if (sb->s_flags & MS_RDONLY)
1028 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
1029 else {
1030 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
1031 return PTR_ERR(fe);
1032 }
1033 } else
1034 mdata->s_bitmap_fe = fe;
1035 }
1036
1037 udf_debug("udf_load_metadata_files Ok\n");
1038 return 0;
1039}
1040
1041static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
1042 struct kernel_lb_addr *root)
1043{
1044 struct fileSetDesc *fset;
1045
1046 fset = (struct fileSetDesc *)bh->b_data;
1047
1048 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
1049
1050 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
1051
1052 udf_debug("Rootdir at block=%d, partition=%d\n",
1053 root->logicalBlockNum, root->partitionReferenceNum);
1054}
1055
1056int udf_compute_nr_groups(struct super_block *sb, u32 partition)
1057{
1058 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
1059 return DIV_ROUND_UP(map->s_partition_len +
1060 (sizeof(struct spaceBitmapDesc) << 3),
1061 sb->s_blocksize * 8);
1062}
1063
1064static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
1065{
1066 struct udf_bitmap *bitmap;
1067 int nr_groups;
1068 int size;
1069
1070 nr_groups = udf_compute_nr_groups(sb, index);
1071 size = sizeof(struct udf_bitmap) +
1072 (sizeof(struct buffer_head *) * nr_groups);
1073
1074 if (size <= PAGE_SIZE)
1075 bitmap = kzalloc(size, GFP_KERNEL);
1076 else
1077 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
1078
1079 if (bitmap == NULL)
1080 return NULL;
1081
1082 bitmap->s_nr_groups = nr_groups;
1083 return bitmap;
1084}
1085
1086static int udf_fill_partdesc_info(struct super_block *sb,
1087 struct partitionDesc *p, int p_index)
1088{
1089 struct udf_part_map *map;
1090 struct udf_sb_info *sbi = UDF_SB(sb);
1091 struct partitionHeaderDesc *phd;
1092
1093 map = &sbi->s_partmaps[p_index];
1094
1095 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1096 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1097
1098 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1099 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1100 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1101 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1102 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1103 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1104 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1105 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1106
1107 udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
1108 p_index, map->s_partition_type,
1109 map->s_partition_root, map->s_partition_len);
1110
1111 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1112 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
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) @ %ld\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) @ %d\n",
1145 p_index, bitmap->s_extPosition);
1146 }
1147
1148 if (phd->partitionIntegrityTable.extLength)
1149 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1150
1151 if (phd->freedSpaceTable.extLength) {
1152 struct kernel_lb_addr loc = {
1153 .logicalBlockNum = le32_to_cpu(
1154 phd->freedSpaceTable.extPosition),
1155 .partitionReferenceNum = p_index,
1156 };
1157 struct inode *inode;
1158
1159 inode = udf_iget_special(sb, &loc);
1160 if (IS_ERR(inode)) {
1161 udf_debug("cannot load freedSpaceTable (part %d)\n",
1162 p_index);
1163 return PTR_ERR(inode);
1164 }
1165 map->s_fspace.s_table = inode;
1166 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1167 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1168 p_index, map->s_fspace.s_table->i_ino);
1169 }
1170
1171 if (phd->freedSpaceBitmap.extLength) {
1172 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1173 if (!bitmap)
1174 return -ENOMEM;
1175 map->s_fspace.s_bitmap = bitmap;
1176 bitmap->s_extPosition = le32_to_cpu(
1177 phd->freedSpaceBitmap.extPosition);
1178 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1179 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1180 p_index, bitmap->s_extPosition);
1181 }
1182 return 0;
1183}
1184
1185static void udf_find_vat_block(struct super_block *sb, int p_index,
1186 int type1_index, sector_t start_block)
1187{
1188 struct udf_sb_info *sbi = UDF_SB(sb);
1189 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1190 sector_t vat_block;
1191 struct kernel_lb_addr ino;
1192 struct inode *inode;
1193
1194 /*
1195 * VAT file entry is in the last recorded block. Some broken disks have
1196 * it a few blocks before so try a bit harder...
1197 */
1198 ino.partitionReferenceNum = type1_index;
1199 for (vat_block = start_block;
1200 vat_block >= map->s_partition_root &&
1201 vat_block >= start_block - 3; vat_block--) {
1202 ino.logicalBlockNum = vat_block - map->s_partition_root;
1203 inode = udf_iget_special(sb, &ino);
1204 if (!IS_ERR(inode)) {
1205 sbi->s_vat_inode = inode;
1206 break;
1207 }
1208 }
1209}
1210
1211static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1212{
1213 struct udf_sb_info *sbi = UDF_SB(sb);
1214 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1215 struct buffer_head *bh = NULL;
1216 struct udf_inode_info *vati;
1217 uint32_t pos;
1218 struct virtualAllocationTable20 *vat20;
1219 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1220
1221 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1222 if (!sbi->s_vat_inode &&
1223 sbi->s_last_block != blocks - 1) {
1224 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1225 (unsigned long)sbi->s_last_block,
1226 (unsigned long)blocks - 1);
1227 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1228 }
1229 if (!sbi->s_vat_inode)
1230 return -EIO;
1231
1232 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1233 map->s_type_specific.s_virtual.s_start_offset = 0;
1234 map->s_type_specific.s_virtual.s_num_entries =
1235 (sbi->s_vat_inode->i_size - 36) >> 2;
1236 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1237 vati = UDF_I(sbi->s_vat_inode);
1238 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1239 pos = udf_block_map(sbi->s_vat_inode, 0);
1240 bh = sb_bread(sb, pos);
1241 if (!bh)
1242 return -EIO;
1243 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1244 } else {
1245 vat20 = (struct virtualAllocationTable20 *)
1246 vati->i_ext.i_data;
1247 }
1248
1249 map->s_type_specific.s_virtual.s_start_offset =
1250 le16_to_cpu(vat20->lengthHeader);
1251 map->s_type_specific.s_virtual.s_num_entries =
1252 (sbi->s_vat_inode->i_size -
1253 map->s_type_specific.s_virtual.
1254 s_start_offset) >> 2;
1255 brelse(bh);
1256 }
1257 return 0;
1258}
1259
1260/*
1261 * Load partition descriptor block
1262 *
1263 * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
1264 * sequence.
1265 */
1266static int udf_load_partdesc(struct super_block *sb, sector_t block)
1267{
1268 struct buffer_head *bh;
1269 struct partitionDesc *p;
1270 struct udf_part_map *map;
1271 struct udf_sb_info *sbi = UDF_SB(sb);
1272 int i, type1_idx;
1273 uint16_t partitionNumber;
1274 uint16_t ident;
1275 int ret;
1276
1277 bh = udf_read_tagged(sb, block, block, &ident);
1278 if (!bh)
1279 return -EAGAIN;
1280 if (ident != TAG_IDENT_PD) {
1281 ret = 0;
1282 goto out_bh;
1283 }
1284
1285 p = (struct partitionDesc *)bh->b_data;
1286 partitionNumber = le16_to_cpu(p->partitionNumber);
1287
1288 /* First scan for TYPE1 and SPARABLE partitions */
1289 for (i = 0; i < sbi->s_partitions; i++) {
1290 map = &sbi->s_partmaps[i];
1291 udf_debug("Searching map: (%d == %d)\n",
1292 map->s_partition_num, partitionNumber);
1293 if (map->s_partition_num == partitionNumber &&
1294 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1295 map->s_partition_type == UDF_SPARABLE_MAP15))
1296 break;
1297 }
1298
1299 if (i >= sbi->s_partitions) {
1300 udf_debug("Partition (%d) not found in partition map\n",
1301 partitionNumber);
1302 ret = 0;
1303 goto out_bh;
1304 }
1305
1306 ret = udf_fill_partdesc_info(sb, p, i);
1307 if (ret < 0)
1308 goto out_bh;
1309
1310 /*
1311 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1312 * PHYSICAL partitions are already set up
1313 */
1314 type1_idx = i;
1315#ifdef UDFFS_DEBUG
1316 map = NULL; /* supress 'maybe used uninitialized' warning */
1317#endif
1318 for (i = 0; i < sbi->s_partitions; i++) {
1319 map = &sbi->s_partmaps[i];
1320
1321 if (map->s_partition_num == partitionNumber &&
1322 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1323 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1324 map->s_partition_type == UDF_METADATA_MAP25))
1325 break;
1326 }
1327
1328 if (i >= sbi->s_partitions) {
1329 ret = 0;
1330 goto out_bh;
1331 }
1332
1333 ret = udf_fill_partdesc_info(sb, p, i);
1334 if (ret < 0)
1335 goto out_bh;
1336
1337 if (map->s_partition_type == UDF_METADATA_MAP25) {
1338 ret = udf_load_metadata_files(sb, i, type1_idx);
1339 if (ret < 0) {
1340 udf_err(sb, "error loading MetaData partition map %d\n",
1341 i);
1342 goto out_bh;
1343 }
1344 } else {
1345 /*
1346 * If we have a partition with virtual map, we don't handle
1347 * writing to it (we overwrite blocks instead of relocating
1348 * them).
1349 */
1350 if (!(sb->s_flags & MS_RDONLY)) {
1351 ret = -EACCES;
1352 goto out_bh;
1353 }
1354 ret = udf_load_vat(sb, i, type1_idx);
1355 if (ret < 0)
1356 goto out_bh;
1357 }
1358 ret = 0;
1359out_bh:
1360 /* In case loading failed, we handle cleanup in udf_fill_super */
1361 brelse(bh);
1362 return ret;
1363}
1364
1365static int udf_load_sparable_map(struct super_block *sb,
1366 struct udf_part_map *map,
1367 struct sparablePartitionMap *spm)
1368{
1369 uint32_t loc;
1370 uint16_t ident;
1371 struct sparingTable *st;
1372 struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
1373 int i;
1374 struct buffer_head *bh;
1375
1376 map->s_partition_type = UDF_SPARABLE_MAP15;
1377 sdata->s_packet_len = le16_to_cpu(spm->packetLength);
1378 if (!is_power_of_2(sdata->s_packet_len)) {
1379 udf_err(sb, "error loading logical volume descriptor: "
1380 "Invalid packet length %u\n",
1381 (unsigned)sdata->s_packet_len);
1382 return -EIO;
1383 }
1384 if (spm->numSparingTables > 4) {
1385 udf_err(sb, "error loading logical volume descriptor: "
1386 "Too many sparing tables (%d)\n",
1387 (int)spm->numSparingTables);
1388 return -EIO;
1389 }
1390
1391 for (i = 0; i < spm->numSparingTables; i++) {
1392 loc = le32_to_cpu(spm->locSparingTable[i]);
1393 bh = udf_read_tagged(sb, loc, loc, &ident);
1394 if (!bh)
1395 continue;
1396
1397 st = (struct sparingTable *)bh->b_data;
1398 if (ident != 0 ||
1399 strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
1400 strlen(UDF_ID_SPARING)) ||
1401 sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
1402 sb->s_blocksize) {
1403 brelse(bh);
1404 continue;
1405 }
1406
1407 sdata->s_spar_map[i] = bh;
1408 }
1409 map->s_partition_func = udf_get_pblock_spar15;
1410 return 0;
1411}
1412
1413static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1414 struct kernel_lb_addr *fileset)
1415{
1416 struct logicalVolDesc *lvd;
1417 int i, offset;
1418 uint8_t type;
1419 struct udf_sb_info *sbi = UDF_SB(sb);
1420 struct genericPartitionMap *gpm;
1421 uint16_t ident;
1422 struct buffer_head *bh;
1423 unsigned int table_len;
1424 int ret;
1425
1426 bh = udf_read_tagged(sb, block, block, &ident);
1427 if (!bh)
1428 return -EAGAIN;
1429 BUG_ON(ident != TAG_IDENT_LVD);
1430 lvd = (struct logicalVolDesc *)bh->b_data;
1431 table_len = le32_to_cpu(lvd->mapTableLength);
1432 if (table_len > sb->s_blocksize - sizeof(*lvd)) {
1433 udf_err(sb, "error loading logical volume descriptor: "
1434 "Partition table too long (%u > %lu)\n", table_len,
1435 sb->s_blocksize - sizeof(*lvd));
1436 ret = -EIO;
1437 goto out_bh;
1438 }
1439
1440 ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1441 if (ret)
1442 goto out_bh;
1443
1444 for (i = 0, offset = 0;
1445 i < sbi->s_partitions && offset < table_len;
1446 i++, offset += gpm->partitionMapLength) {
1447 struct udf_part_map *map = &sbi->s_partmaps[i];
1448 gpm = (struct genericPartitionMap *)
1449 &(lvd->partitionMaps[offset]);
1450 type = gpm->partitionMapType;
1451 if (type == 1) {
1452 struct genericPartitionMap1 *gpm1 =
1453 (struct genericPartitionMap1 *)gpm;
1454 map->s_partition_type = UDF_TYPE1_MAP15;
1455 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1456 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1457 map->s_partition_func = NULL;
1458 } else if (type == 2) {
1459 struct udfPartitionMap2 *upm2 =
1460 (struct udfPartitionMap2 *)gpm;
1461 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1462 strlen(UDF_ID_VIRTUAL))) {
1463 u16 suf =
1464 le16_to_cpu(((__le16 *)upm2->partIdent.
1465 identSuffix)[0]);
1466 if (suf < 0x0200) {
1467 map->s_partition_type =
1468 UDF_VIRTUAL_MAP15;
1469 map->s_partition_func =
1470 udf_get_pblock_virt15;
1471 } else {
1472 map->s_partition_type =
1473 UDF_VIRTUAL_MAP20;
1474 map->s_partition_func =
1475 udf_get_pblock_virt20;
1476 }
1477 } else if (!strncmp(upm2->partIdent.ident,
1478 UDF_ID_SPARABLE,
1479 strlen(UDF_ID_SPARABLE))) {
1480 ret = udf_load_sparable_map(sb, map,
1481 (struct sparablePartitionMap *)gpm);
1482 if (ret < 0)
1483 goto out_bh;
1484 } else if (!strncmp(upm2->partIdent.ident,
1485 UDF_ID_METADATA,
1486 strlen(UDF_ID_METADATA))) {
1487 struct udf_meta_data *mdata =
1488 &map->s_type_specific.s_metadata;
1489 struct metadataPartitionMap *mdm =
1490 (struct metadataPartitionMap *)
1491 &(lvd->partitionMaps[offset]);
1492 udf_debug("Parsing Logical vol part %d type %d id=%s\n",
1493 i, type, UDF_ID_METADATA);
1494
1495 map->s_partition_type = UDF_METADATA_MAP25;
1496 map->s_partition_func = udf_get_pblock_meta25;
1497
1498 mdata->s_meta_file_loc =
1499 le32_to_cpu(mdm->metadataFileLoc);
1500 mdata->s_mirror_file_loc =
1501 le32_to_cpu(mdm->metadataMirrorFileLoc);
1502 mdata->s_bitmap_file_loc =
1503 le32_to_cpu(mdm->metadataBitmapFileLoc);
1504 mdata->s_alloc_unit_size =
1505 le32_to_cpu(mdm->allocUnitSize);
1506 mdata->s_align_unit_size =
1507 le16_to_cpu(mdm->alignUnitSize);
1508 if (mdm->flags & 0x01)
1509 mdata->s_flags |= MF_DUPLICATE_MD;
1510
1511 udf_debug("Metadata Ident suffix=0x%x\n",
1512 le16_to_cpu(*(__le16 *)
1513 mdm->partIdent.identSuffix));
1514 udf_debug("Metadata part num=%d\n",
1515 le16_to_cpu(mdm->partitionNum));
1516 udf_debug("Metadata part alloc unit size=%d\n",
1517 le32_to_cpu(mdm->allocUnitSize));
1518 udf_debug("Metadata file loc=%d\n",
1519 le32_to_cpu(mdm->metadataFileLoc));
1520 udf_debug("Mirror file loc=%d\n",
1521 le32_to_cpu(mdm->metadataMirrorFileLoc));
1522 udf_debug("Bitmap file loc=%d\n",
1523 le32_to_cpu(mdm->metadataBitmapFileLoc));
1524 udf_debug("Flags: %d %d\n",
1525 mdata->s_flags, mdm->flags);
1526 } else {
1527 udf_debug("Unknown ident: %s\n",
1528 upm2->partIdent.ident);
1529 continue;
1530 }
1531 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1532 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1533 }
1534 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1535 i, map->s_partition_num, type, map->s_volumeseqnum);
1536 }
1537
1538 if (fileset) {
1539 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1540
1541 *fileset = lelb_to_cpu(la->extLocation);
1542 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1543 fileset->logicalBlockNum,
1544 fileset->partitionReferenceNum);
1545 }
1546 if (lvd->integritySeqExt.extLength)
1547 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1548 ret = 0;
1549out_bh:
1550 brelse(bh);
1551 return ret;
1552}
1553
1554/*
1555 * Find the prevailing Logical Volume Integrity Descriptor.
1556 */
1557static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1558{
1559 struct buffer_head *bh, *final_bh;
1560 uint16_t ident;
1561 struct udf_sb_info *sbi = UDF_SB(sb);
1562 struct logicalVolIntegrityDesc *lvid;
1563 int indirections = 0;
1564
1565 while (++indirections <= UDF_MAX_LVID_NESTING) {
1566 final_bh = NULL;
1567 while (loc.extLength > 0 &&
1568 (bh = udf_read_tagged(sb, loc.extLocation,
1569 loc.extLocation, &ident))) {
1570 if (ident != TAG_IDENT_LVID) {
1571 brelse(bh);
1572 break;
1573 }
1574
1575 brelse(final_bh);
1576 final_bh = bh;
1577
1578 loc.extLength -= sb->s_blocksize;
1579 loc.extLocation++;
1580 }
1581
1582 if (!final_bh)
1583 return;
1584
1585 brelse(sbi->s_lvid_bh);
1586 sbi->s_lvid_bh = final_bh;
1587
1588 lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
1589 if (lvid->nextIntegrityExt.extLength == 0)
1590 return;
1591
1592 loc = leea_to_cpu(lvid->nextIntegrityExt);
1593 }
1594
1595 udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
1596 UDF_MAX_LVID_NESTING);
1597 brelse(sbi->s_lvid_bh);
1598 sbi->s_lvid_bh = NULL;
1599}
1600
1601
1602/*
1603 * Process a main/reserve volume descriptor sequence.
1604 * @block First block of first extent of the sequence.
1605 * @lastblock Lastblock of first extent of the sequence.
1606 * @fileset There we store extent containing root fileset
1607 *
1608 * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
1609 * sequence
1610 */
1611static noinline int udf_process_sequence(
1612 struct super_block *sb,
1613 sector_t block, sector_t lastblock,
1614 struct kernel_lb_addr *fileset)
1615{
1616 struct buffer_head *bh = NULL;
1617 struct udf_vds_record vds[VDS_POS_LENGTH];
1618 struct udf_vds_record *curr;
1619 struct generic_desc *gd;
1620 struct volDescPtr *vdp;
1621 bool done = false;
1622 uint32_t vdsn;
1623 uint16_t ident;
1624 long next_s = 0, next_e = 0;
1625 int ret;
1626 unsigned int indirections = 0;
1627
1628 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1629
1630 /*
1631 * Read the main descriptor sequence and find which descriptors
1632 * are in it.
1633 */
1634 for (; (!done && block <= lastblock); block++) {
1635
1636 bh = udf_read_tagged(sb, block, block, &ident);
1637 if (!bh) {
1638 udf_err(sb,
1639 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1640 (unsigned long long)block);
1641 return -EAGAIN;
1642 }
1643
1644 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1645 gd = (struct generic_desc *)bh->b_data;
1646 vdsn = le32_to_cpu(gd->volDescSeqNum);
1647 switch (ident) {
1648 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1649 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1650 if (vdsn >= curr->volDescSeqNum) {
1651 curr->volDescSeqNum = vdsn;
1652 curr->block = block;
1653 }
1654 break;
1655 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1656 curr = &vds[VDS_POS_VOL_DESC_PTR];
1657 if (vdsn >= curr->volDescSeqNum) {
1658 curr->volDescSeqNum = vdsn;
1659 curr->block = block;
1660
1661 vdp = (struct volDescPtr *)bh->b_data;
1662 next_s = le32_to_cpu(
1663 vdp->nextVolDescSeqExt.extLocation);
1664 next_e = le32_to_cpu(
1665 vdp->nextVolDescSeqExt.extLength);
1666 next_e = next_e >> sb->s_blocksize_bits;
1667 next_e += next_s;
1668 }
1669 break;
1670 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1671 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1672 if (vdsn >= curr->volDescSeqNum) {
1673 curr->volDescSeqNum = vdsn;
1674 curr->block = block;
1675 }
1676 break;
1677 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1678 curr = &vds[VDS_POS_PARTITION_DESC];
1679 if (!curr->block)
1680 curr->block = block;
1681 break;
1682 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1683 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1684 if (vdsn >= curr->volDescSeqNum) {
1685 curr->volDescSeqNum = vdsn;
1686 curr->block = block;
1687 }
1688 break;
1689 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1690 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1691 if (vdsn >= curr->volDescSeqNum) {
1692 curr->volDescSeqNum = vdsn;
1693 curr->block = block;
1694 }
1695 break;
1696 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1697 if (++indirections > UDF_MAX_TD_NESTING) {
1698 udf_err(sb, "too many TDs (max %u supported)\n", UDF_MAX_TD_NESTING);
1699 brelse(bh);
1700 return -EIO;
1701 }
1702
1703 vds[VDS_POS_TERMINATING_DESC].block = block;
1704 if (next_e) {
1705 block = next_s;
1706 lastblock = next_e;
1707 next_s = next_e = 0;
1708 } else
1709 done = true;
1710 break;
1711 }
1712 brelse(bh);
1713 }
1714 /*
1715 * Now read interesting descriptors again and process them
1716 * in a suitable order
1717 */
1718 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1719 udf_err(sb, "Primary Volume Descriptor not found!\n");
1720 return -EAGAIN;
1721 }
1722 ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
1723 if (ret < 0)
1724 return ret;
1725
1726 if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
1727 ret = udf_load_logicalvol(sb,
1728 vds[VDS_POS_LOGICAL_VOL_DESC].block,
1729 fileset);
1730 if (ret < 0)
1731 return ret;
1732 }
1733
1734 if (vds[VDS_POS_PARTITION_DESC].block) {
1735 /*
1736 * We rescan the whole descriptor sequence to find
1737 * partition descriptor blocks and process them.
1738 */
1739 for (block = vds[VDS_POS_PARTITION_DESC].block;
1740 block < vds[VDS_POS_TERMINATING_DESC].block;
1741 block++) {
1742 ret = udf_load_partdesc(sb, block);
1743 if (ret < 0)
1744 return ret;
1745 }
1746 }
1747
1748 return 0;
1749}
1750
1751/*
1752 * Load Volume Descriptor Sequence described by anchor in bh
1753 *
1754 * Returns <0 on error, 0 on success
1755 */
1756static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1757 struct kernel_lb_addr *fileset)
1758{
1759 struct anchorVolDescPtr *anchor;
1760 sector_t main_s, main_e, reserve_s, reserve_e;
1761 int ret;
1762
1763 anchor = (struct anchorVolDescPtr *)bh->b_data;
1764
1765 /* Locate the main sequence */
1766 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1767 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1768 main_e = main_e >> sb->s_blocksize_bits;
1769 main_e += main_s;
1770
1771 /* Locate the reserve sequence */
1772 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1773 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1774 reserve_e = reserve_e >> sb->s_blocksize_bits;
1775 reserve_e += reserve_s;
1776
1777 /* Process the main & reserve sequences */
1778 /* responsible for finding the PartitionDesc(s) */
1779 ret = udf_process_sequence(sb, main_s, main_e, fileset);
1780 if (ret != -EAGAIN)
1781 return ret;
1782 udf_sb_free_partitions(sb);
1783 ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1784 if (ret < 0) {
1785 udf_sb_free_partitions(sb);
1786 /* No sequence was OK, return -EIO */
1787 if (ret == -EAGAIN)
1788 ret = -EIO;
1789 }
1790 return ret;
1791}
1792
1793/*
1794 * Check whether there is an anchor block in the given block and
1795 * load Volume Descriptor Sequence if so.
1796 *
1797 * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
1798 * block
1799 */
1800static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1801 struct kernel_lb_addr *fileset)
1802{
1803 struct buffer_head *bh;
1804 uint16_t ident;
1805 int ret;
1806
1807 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1808 udf_fixed_to_variable(block) >=
1809 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1810 return -EAGAIN;
1811
1812 bh = udf_read_tagged(sb, block, block, &ident);
1813 if (!bh)
1814 return -EAGAIN;
1815 if (ident != TAG_IDENT_AVDP) {
1816 brelse(bh);
1817 return -EAGAIN;
1818 }
1819 ret = udf_load_sequence(sb, bh, fileset);
1820 brelse(bh);
1821 return ret;
1822}
1823
1824/*
1825 * Search for an anchor volume descriptor pointer.
1826 *
1827 * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
1828 * of anchors.
1829 */
1830static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
1831 struct kernel_lb_addr *fileset)
1832{
1833 sector_t last[6];
1834 int i;
1835 struct udf_sb_info *sbi = UDF_SB(sb);
1836 int last_count = 0;
1837 int ret;
1838
1839 /* First try user provided anchor */
1840 if (sbi->s_anchor) {
1841 ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
1842 if (ret != -EAGAIN)
1843 return ret;
1844 }
1845 /*
1846 * according to spec, anchor is in either:
1847 * block 256
1848 * lastblock-256
1849 * lastblock
1850 * however, if the disc isn't closed, it could be 512.
1851 */
1852 ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
1853 if (ret != -EAGAIN)
1854 return ret;
1855 /*
1856 * The trouble is which block is the last one. Drives often misreport
1857 * this so we try various possibilities.
1858 */
1859 last[last_count++] = *lastblock;
1860 if (*lastblock >= 1)
1861 last[last_count++] = *lastblock - 1;
1862 last[last_count++] = *lastblock + 1;
1863 if (*lastblock >= 2)
1864 last[last_count++] = *lastblock - 2;
1865 if (*lastblock >= 150)
1866 last[last_count++] = *lastblock - 150;
1867 if (*lastblock >= 152)
1868 last[last_count++] = *lastblock - 152;
1869
1870 for (i = 0; i < last_count; i++) {
1871 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1872 sb->s_blocksize_bits)
1873 continue;
1874 ret = udf_check_anchor_block(sb, last[i], fileset);
1875 if (ret != -EAGAIN) {
1876 if (!ret)
1877 *lastblock = last[i];
1878 return ret;
1879 }
1880 if (last[i] < 256)
1881 continue;
1882 ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
1883 if (ret != -EAGAIN) {
1884 if (!ret)
1885 *lastblock = last[i];
1886 return ret;
1887 }
1888 }
1889
1890 /* Finally try block 512 in case media is open */
1891 return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
1892}
1893
1894/*
1895 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1896 * area specified by it. The function expects sbi->s_lastblock to be the last
1897 * block on the media.
1898 *
1899 * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
1900 * was not found.
1901 */
1902static int udf_find_anchor(struct super_block *sb,
1903 struct kernel_lb_addr *fileset)
1904{
1905 struct udf_sb_info *sbi = UDF_SB(sb);
1906 sector_t lastblock = sbi->s_last_block;
1907 int ret;
1908
1909 ret = udf_scan_anchors(sb, &lastblock, fileset);
1910 if (ret != -EAGAIN)
1911 goto out;
1912
1913 /* No anchor found? Try VARCONV conversion of block numbers */
1914 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1915 lastblock = udf_variable_to_fixed(sbi->s_last_block);
1916 /* Firstly, we try to not convert number of the last block */
1917 ret = udf_scan_anchors(sb, &lastblock, fileset);
1918 if (ret != -EAGAIN)
1919 goto out;
1920
1921 lastblock = sbi->s_last_block;
1922 /* Secondly, we try with converted number of the last block */
1923 ret = udf_scan_anchors(sb, &lastblock, fileset);
1924 if (ret < 0) {
1925 /* VARCONV didn't help. Clear it. */
1926 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1927 }
1928out:
1929 if (ret == 0)
1930 sbi->s_last_block = lastblock;
1931 return ret;
1932}
1933
1934/*
1935 * Check Volume Structure Descriptor, find Anchor block and load Volume
1936 * Descriptor Sequence.
1937 *
1938 * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
1939 * block was not found.
1940 */
1941static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1942 int silent, struct kernel_lb_addr *fileset)
1943{
1944 struct udf_sb_info *sbi = UDF_SB(sb);
1945 loff_t nsr_off;
1946 int ret;
1947
1948 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1949 if (!silent)
1950 udf_warn(sb, "Bad block size\n");
1951 return -EINVAL;
1952 }
1953 sbi->s_last_block = uopt->lastblock;
1954 if (!uopt->novrs) {
1955 /* Check that it is NSR02 compliant */
1956 nsr_off = udf_check_vsd(sb);
1957 if (!nsr_off) {
1958 if (!silent)
1959 udf_warn(sb, "No VRS found\n");
1960 return 0;
1961 }
1962 if (nsr_off == -1)
1963 udf_debug("Failed to read sector at offset %d. "
1964 "Assuming open disc. Skipping validity "
1965 "check\n", VSD_FIRST_SECTOR_OFFSET);
1966 if (!sbi->s_last_block)
1967 sbi->s_last_block = udf_get_last_block(sb);
1968 } else {
1969 udf_debug("Validity check skipped because of novrs option\n");
1970 }
1971
1972 /* Look for anchor block and load Volume Descriptor Sequence */
1973 sbi->s_anchor = uopt->anchor;
1974 ret = udf_find_anchor(sb, fileset);
1975 if (ret < 0) {
1976 if (!silent && ret == -EAGAIN)
1977 udf_warn(sb, "No anchor found\n");
1978 return ret;
1979 }
1980 return 0;
1981}
1982
1983static void udf_open_lvid(struct super_block *sb)
1984{
1985 struct udf_sb_info *sbi = UDF_SB(sb);
1986 struct buffer_head *bh = sbi->s_lvid_bh;
1987 struct logicalVolIntegrityDesc *lvid;
1988 struct logicalVolIntegrityDescImpUse *lvidiu;
1989
1990 if (!bh)
1991 return;
1992 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1993 lvidiu = udf_sb_lvidiu(sb);
1994 if (!lvidiu)
1995 return;
1996
1997 mutex_lock(&sbi->s_alloc_mutex);
1998 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1999 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2000 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
2001 CURRENT_TIME);
2002 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
2003
2004 lvid->descTag.descCRC = cpu_to_le16(
2005 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2006 le16_to_cpu(lvid->descTag.descCRCLength)));
2007
2008 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
2009 mark_buffer_dirty(bh);
2010 sbi->s_lvid_dirty = 0;
2011 mutex_unlock(&sbi->s_alloc_mutex);
2012 /* Make opening of filesystem visible on the media immediately */
2013 sync_dirty_buffer(bh);
2014}
2015
2016static void udf_close_lvid(struct super_block *sb)
2017{
2018 struct udf_sb_info *sbi = UDF_SB(sb);
2019 struct buffer_head *bh = sbi->s_lvid_bh;
2020 struct logicalVolIntegrityDesc *lvid;
2021 struct logicalVolIntegrityDescImpUse *lvidiu;
2022
2023 if (!bh)
2024 return;
2025 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2026 lvidiu = udf_sb_lvidiu(sb);
2027 if (!lvidiu)
2028 return;
2029
2030 mutex_lock(&sbi->s_alloc_mutex);
2031 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
2032 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
2033 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
2034 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
2035 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
2036 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
2037 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
2038 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
2039 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
2040 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
2041
2042 lvid->descTag.descCRC = cpu_to_le16(
2043 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
2044 le16_to_cpu(lvid->descTag.descCRCLength)));
2045
2046 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
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 mark_buffer_dirty(bh);
2054 sbi->s_lvid_dirty = 0;
2055 mutex_unlock(&sbi->s_alloc_mutex);
2056 /* Make closing of filesystem visible on the media immediately */
2057 sync_dirty_buffer(bh);
2058}
2059
2060u64 lvid_get_unique_id(struct super_block *sb)
2061{
2062 struct buffer_head *bh;
2063 struct udf_sb_info *sbi = UDF_SB(sb);
2064 struct logicalVolIntegrityDesc *lvid;
2065 struct logicalVolHeaderDesc *lvhd;
2066 u64 uniqueID;
2067 u64 ret;
2068
2069 bh = sbi->s_lvid_bh;
2070 if (!bh)
2071 return 0;
2072
2073 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
2074 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
2075
2076 mutex_lock(&sbi->s_alloc_mutex);
2077 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
2078 if (!(++uniqueID & 0xFFFFFFFF))
2079 uniqueID += 16;
2080 lvhd->uniqueID = cpu_to_le64(uniqueID);
2081 mutex_unlock(&sbi->s_alloc_mutex);
2082 mark_buffer_dirty(bh);
2083
2084 return ret;
2085}
2086
2087static int udf_fill_super(struct super_block *sb, void *options, int silent)
2088{
2089 int ret = -EINVAL;
2090 struct inode *inode = NULL;
2091 struct udf_options uopt;
2092 struct kernel_lb_addr rootdir, fileset;
2093 struct udf_sb_info *sbi;
2094 bool lvid_open = false;
2095
2096 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
2097 uopt.uid = INVALID_UID;
2098 uopt.gid = INVALID_GID;
2099 uopt.umask = 0;
2100 uopt.fmode = UDF_INVALID_MODE;
2101 uopt.dmode = UDF_INVALID_MODE;
2102
2103 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
2104 if (!sbi)
2105 return -ENOMEM;
2106
2107 sb->s_fs_info = sbi;
2108
2109 mutex_init(&sbi->s_alloc_mutex);
2110
2111 if (!udf_parse_options((char *)options, &uopt, false))
2112 goto parse_options_failure;
2113
2114 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
2115 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
2116 udf_err(sb, "utf8 cannot be combined with iocharset\n");
2117 goto parse_options_failure;
2118 }
2119#ifdef CONFIG_UDF_NLS
2120 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
2121 uopt.nls_map = load_nls_default();
2122 if (!uopt.nls_map)
2123 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
2124 else
2125 udf_debug("Using default NLS map\n");
2126 }
2127#endif
2128 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
2129 uopt.flags |= (1 << UDF_FLAG_UTF8);
2130
2131 fileset.logicalBlockNum = 0xFFFFFFFF;
2132 fileset.partitionReferenceNum = 0xFFFF;
2133
2134 sbi->s_flags = uopt.flags;
2135 sbi->s_uid = uopt.uid;
2136 sbi->s_gid = uopt.gid;
2137 sbi->s_umask = uopt.umask;
2138 sbi->s_fmode = uopt.fmode;
2139 sbi->s_dmode = uopt.dmode;
2140 sbi->s_nls_map = uopt.nls_map;
2141 rwlock_init(&sbi->s_cred_lock);
2142
2143 if (uopt.session == 0xFFFFFFFF)
2144 sbi->s_session = udf_get_last_session(sb);
2145 else
2146 sbi->s_session = uopt.session;
2147
2148 udf_debug("Multi-session=%d\n", sbi->s_session);
2149
2150 /* Fill in the rest of the superblock */
2151 sb->s_op = &udf_sb_ops;
2152 sb->s_export_op = &udf_export_ops;
2153
2154 sb->s_magic = UDF_SUPER_MAGIC;
2155 sb->s_time_gran = 1000;
2156
2157 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
2158 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2159 } else {
2160 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
2161 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2162 if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
2163 if (!silent)
2164 pr_notice("Rescanning with blocksize %d\n",
2165 UDF_DEFAULT_BLOCKSIZE);
2166 brelse(sbi->s_lvid_bh);
2167 sbi->s_lvid_bh = NULL;
2168 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
2169 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
2170 }
2171 }
2172 if (ret < 0) {
2173 if (ret == -EAGAIN) {
2174 udf_warn(sb, "No partition found (1)\n");
2175 ret = -EINVAL;
2176 }
2177 goto error_out;
2178 }
2179
2180 udf_debug("Lastblock=%d\n", sbi->s_last_block);
2181
2182 if (sbi->s_lvid_bh) {
2183 struct logicalVolIntegrityDescImpUse *lvidiu =
2184 udf_sb_lvidiu(sb);
2185 uint16_t minUDFReadRev;
2186 uint16_t minUDFWriteRev;
2187
2188 if (!lvidiu) {
2189 ret = -EINVAL;
2190 goto error_out;
2191 }
2192 minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
2193 minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
2194 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
2195 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
2196 minUDFReadRev,
2197 UDF_MAX_READ_VERSION);
2198 ret = -EINVAL;
2199 goto error_out;
2200 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
2201 !(sb->s_flags & MS_RDONLY)) {
2202 ret = -EACCES;
2203 goto error_out;
2204 }
2205
2206 sbi->s_udfrev = minUDFWriteRev;
2207
2208 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2209 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2210 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2211 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2212 }
2213
2214 if (!sbi->s_partitions) {
2215 udf_warn(sb, "No partition found (2)\n");
2216 ret = -EINVAL;
2217 goto error_out;
2218 }
2219
2220 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2221 UDF_PART_FLAG_READ_ONLY &&
2222 !(sb->s_flags & MS_RDONLY)) {
2223 ret = -EACCES;
2224 goto error_out;
2225 }
2226
2227 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2228 udf_warn(sb, "No fileset found\n");
2229 ret = -EINVAL;
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->s_flags & MS_RDONLY)) {
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=%d, partition=%d\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 = MAX_LFS_FILESIZE;
2265 sb->s_max_links = UDF_MAX_LINKS;
2266 return 0;
2267
2268error_out:
2269 iput(sbi->s_vat_inode);
2270parse_options_failure:
2271#ifdef CONFIG_UDF_NLS
2272 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2273 unload_nls(sbi->s_nls_map);
2274#endif
2275 if (lvid_open)
2276 udf_close_lvid(sb);
2277 brelse(sbi->s_lvid_bh);
2278 udf_sb_free_partitions(sb);
2279 kfree(sbi);
2280 sb->s_fs_info = NULL;
2281
2282 return ret;
2283}
2284
2285void _udf_err(struct super_block *sb, const char *function,
2286 const char *fmt, ...)
2287{
2288 struct va_format vaf;
2289 va_list args;
2290
2291 va_start(args, fmt);
2292
2293 vaf.fmt = fmt;
2294 vaf.va = &args;
2295
2296 pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2297
2298 va_end(args);
2299}
2300
2301void _udf_warn(struct super_block *sb, const char *function,
2302 const char *fmt, ...)
2303{
2304 struct va_format vaf;
2305 va_list args;
2306
2307 va_start(args, fmt);
2308
2309 vaf.fmt = fmt;
2310 vaf.va = &args;
2311
2312 pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2313
2314 va_end(args);
2315}
2316
2317static void udf_put_super(struct super_block *sb)
2318{
2319 struct udf_sb_info *sbi;
2320
2321 sbi = UDF_SB(sb);
2322
2323 iput(sbi->s_vat_inode);
2324#ifdef CONFIG_UDF_NLS
2325 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2326 unload_nls(sbi->s_nls_map);
2327#endif
2328 if (!(sb->s_flags & MS_RDONLY))
2329 udf_close_lvid(sb);
2330 brelse(sbi->s_lvid_bh);
2331 udf_sb_free_partitions(sb);
2332 mutex_destroy(&sbi->s_alloc_mutex);
2333 kfree(sb->s_fs_info);
2334 sb->s_fs_info = NULL;
2335}
2336
2337static int udf_sync_fs(struct super_block *sb, int wait)
2338{
2339 struct udf_sb_info *sbi = UDF_SB(sb);
2340
2341 mutex_lock(&sbi->s_alloc_mutex);
2342 if (sbi->s_lvid_dirty) {
2343 /*
2344 * Blockdevice will be synced later so we don't have to submit
2345 * the buffer for IO
2346 */
2347 mark_buffer_dirty(sbi->s_lvid_bh);
2348 sbi->s_lvid_dirty = 0;
2349 }
2350 mutex_unlock(&sbi->s_alloc_mutex);
2351
2352 return 0;
2353}
2354
2355static 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 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2369 le32_to_cpu(lvidiu->numDirs)) : 0)
2370 + buf->f_bfree;
2371 buf->f_ffree = buf->f_bfree;
2372 buf->f_namelen = UDF_NAME_LEN;
2373 buf->f_fsid.val[0] = (u32)id;
2374 buf->f_fsid.val[1] = (u32)(id >> 32);
2375
2376 return 0;
2377}
2378
2379static unsigned int udf_count_free_bitmap(struct super_block *sb,
2380 struct udf_bitmap *bitmap)
2381{
2382 struct buffer_head *bh = NULL;
2383 unsigned int accum = 0;
2384 int index;
2385 int block = 0, newblock;
2386 struct kernel_lb_addr loc;
2387 uint32_t bytes;
2388 uint8_t *ptr;
2389 uint16_t ident;
2390 struct spaceBitmapDesc *bm;
2391
2392 loc.logicalBlockNum = bitmap->s_extPosition;
2393 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2394 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2395
2396 if (!bh) {
2397 udf_err(sb, "udf_count_free failed\n");
2398 goto out;
2399 } else if (ident != TAG_IDENT_SBD) {
2400 brelse(bh);
2401 udf_err(sb, "udf_count_free failed\n");
2402 goto out;
2403 }
2404
2405 bm = (struct spaceBitmapDesc *)bh->b_data;
2406 bytes = le32_to_cpu(bm->numOfBytes);
2407 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2408 ptr = (uint8_t *)bh->b_data;
2409
2410 while (bytes > 0) {
2411 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2412 accum += bitmap_weight((const unsigned long *)(ptr + index),
2413 cur_bytes * 8);
2414 bytes -= cur_bytes;
2415 if (bytes) {
2416 brelse(bh);
2417 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2418 bh = udf_tread(sb, newblock);
2419 if (!bh) {
2420 udf_debug("read failed\n");
2421 goto out;
2422 }
2423 index = 0;
2424 ptr = (uint8_t *)bh->b_data;
2425 }
2426 }
2427 brelse(bh);
2428out:
2429 return accum;
2430}
2431
2432static unsigned int udf_count_free_table(struct super_block *sb,
2433 struct inode *table)
2434{
2435 unsigned int accum = 0;
2436 uint32_t elen;
2437 struct kernel_lb_addr eloc;
2438 int8_t etype;
2439 struct extent_position epos;
2440
2441 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2442 epos.block = UDF_I(table)->i_location;
2443 epos.offset = sizeof(struct unallocSpaceEntry);
2444 epos.bh = NULL;
2445
2446 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2447 accum += (elen >> table->i_sb->s_blocksize_bits);
2448
2449 brelse(epos.bh);
2450 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2451
2452 return accum;
2453}
2454
2455static unsigned int udf_count_free(struct super_block *sb)
2456{
2457 unsigned int accum = 0;
2458 struct udf_sb_info *sbi;
2459 struct udf_part_map *map;
2460
2461 sbi = UDF_SB(sb);
2462 if (sbi->s_lvid_bh) {
2463 struct logicalVolIntegrityDesc *lvid =
2464 (struct logicalVolIntegrityDesc *)
2465 sbi->s_lvid_bh->b_data;
2466 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2467 accum = le32_to_cpu(
2468 lvid->freeSpaceTable[sbi->s_partition]);
2469 if (accum == 0xFFFFFFFF)
2470 accum = 0;
2471 }
2472 }
2473
2474 if (accum)
2475 return accum;
2476
2477 map = &sbi->s_partmaps[sbi->s_partition];
2478 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2479 accum += udf_count_free_bitmap(sb,
2480 map->s_uspace.s_bitmap);
2481 }
2482 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2483 accum += udf_count_free_bitmap(sb,
2484 map->s_fspace.s_bitmap);
2485 }
2486 if (accum)
2487 return accum;
2488
2489 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2490 accum += udf_count_free_table(sb,
2491 map->s_uspace.s_table);
2492 }
2493 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2494 accum += udf_count_free_table(sb,
2495 map->s_fspace.s_table);
2496 }
2497
2498 return accum;
2499}