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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 * 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/buffer_head.h>
52 #include <linux/vfs.h>
53 #include <linux/vmalloc.h>
54 #include <linux/errno.h>
55 #include <linux/mount.h>
56 #include <linux/seq_file.h>
57 #include <linux/bitmap.h>
58 #include <linux/crc-itu-t.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 <asm/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 static char error_buf[1024];
79
80 /* These are the "meat" - everything else is stuffing */
81 static int udf_fill_super(struct super_block *, void *, int);
82 static void udf_put_super(struct super_block *);
83 static int udf_sync_fs(struct super_block *, int);
84 static int udf_remount_fs(struct super_block *, int *, char *);
85 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
86 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
87 struct kernel_lb_addr *);
88 static void udf_load_fileset(struct super_block *, struct buffer_head *,
89 struct kernel_lb_addr *);
90 static void udf_open_lvid(struct super_block *);
91 static void udf_close_lvid(struct super_block *);
92 static unsigned int udf_count_free(struct super_block *);
93 static int udf_statfs(struct dentry *, struct kstatfs *);
94 static int udf_show_options(struct seq_file *, struct vfsmount *);
95
96 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
97 {
98 struct logicalVolIntegrityDesc *lvid =
99 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
100 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
101 __u32 offset = number_of_partitions * 2 *
102 sizeof(uint32_t)/sizeof(uint8_t);
103 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
104 }
105
106 /* UDF filesystem type */
107 static struct dentry *udf_mount(struct file_system_type *fs_type,
108 int flags, const char *dev_name, void *data)
109 {
110 return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
111 }
112
113 static struct file_system_type udf_fstype = {
114 .owner = THIS_MODULE,
115 .name = "udf",
116 .mount = udf_mount,
117 .kill_sb = kill_block_super,
118 .fs_flags = FS_REQUIRES_DEV,
119 };
120
121 static struct kmem_cache *udf_inode_cachep;
122
123 static struct inode *udf_alloc_inode(struct super_block *sb)
124 {
125 struct udf_inode_info *ei;
126 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
127 if (!ei)
128 return NULL;
129
130 ei->i_unique = 0;
131 ei->i_lenExtents = 0;
132 ei->i_next_alloc_block = 0;
133 ei->i_next_alloc_goal = 0;
134 ei->i_strat4096 = 0;
135 init_rwsem(&ei->i_data_sem);
136
137 return &ei->vfs_inode;
138 }
139
140 static void udf_i_callback(struct rcu_head *head)
141 {
142 struct inode *inode = container_of(head, struct inode, i_rcu);
143 INIT_LIST_HEAD(&inode->i_dentry);
144 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
145 }
146
147 static void udf_destroy_inode(struct inode *inode)
148 {
149 call_rcu(&inode->i_rcu, udf_i_callback);
150 }
151
152 static void init_once(void *foo)
153 {
154 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
155
156 ei->i_ext.i_data = NULL;
157 inode_init_once(&ei->vfs_inode);
158 }
159
160 static int init_inodecache(void)
161 {
162 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
163 sizeof(struct udf_inode_info),
164 0, (SLAB_RECLAIM_ACCOUNT |
165 SLAB_MEM_SPREAD),
166 init_once);
167 if (!udf_inode_cachep)
168 return -ENOMEM;
169 return 0;
170 }
171
172 static void destroy_inodecache(void)
173 {
174 kmem_cache_destroy(udf_inode_cachep);
175 }
176
177 /* Superblock operations */
178 static const struct super_operations udf_sb_ops = {
179 .alloc_inode = udf_alloc_inode,
180 .destroy_inode = udf_destroy_inode,
181 .write_inode = udf_write_inode,
182 .evict_inode = udf_evict_inode,
183 .put_super = udf_put_super,
184 .sync_fs = udf_sync_fs,
185 .statfs = udf_statfs,
186 .remount_fs = udf_remount_fs,
187 .show_options = udf_show_options,
188 };
189
190 struct udf_options {
191 unsigned char novrs;
192 unsigned int blocksize;
193 unsigned int session;
194 unsigned int lastblock;
195 unsigned int anchor;
196 unsigned int volume;
197 unsigned short partition;
198 unsigned int fileset;
199 unsigned int rootdir;
200 unsigned int flags;
201 mode_t umask;
202 gid_t gid;
203 uid_t uid;
204 mode_t fmode;
205 mode_t dmode;
206 struct nls_table *nls_map;
207 };
208
209 static int __init init_udf_fs(void)
210 {
211 int err;
212
213 err = init_inodecache();
214 if (err)
215 goto out1;
216 err = register_filesystem(&udf_fstype);
217 if (err)
218 goto out;
219
220 return 0;
221
222 out:
223 destroy_inodecache();
224
225 out1:
226 return err;
227 }
228
229 static void __exit exit_udf_fs(void)
230 {
231 unregister_filesystem(&udf_fstype);
232 destroy_inodecache();
233 }
234
235 module_init(init_udf_fs)
236 module_exit(exit_udf_fs)
237
238 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
239 {
240 struct udf_sb_info *sbi = UDF_SB(sb);
241
242 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
243 GFP_KERNEL);
244 if (!sbi->s_partmaps) {
245 udf_err(sb, "Unable to allocate space for %d partition maps\n",
246 count);
247 sbi->s_partitions = 0;
248 return -ENOMEM;
249 }
250
251 sbi->s_partitions = count;
252 return 0;
253 }
254
255 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
256 {
257 struct super_block *sb = mnt->mnt_sb;
258 struct udf_sb_info *sbi = UDF_SB(sb);
259
260 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
261 seq_puts(seq, ",nostrict");
262 if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
263 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
264 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
265 seq_puts(seq, ",unhide");
266 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
267 seq_puts(seq, ",undelete");
268 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
269 seq_puts(seq, ",noadinicb");
270 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
271 seq_puts(seq, ",shortad");
272 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
273 seq_puts(seq, ",uid=forget");
274 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
275 seq_puts(seq, ",uid=ignore");
276 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
277 seq_puts(seq, ",gid=forget");
278 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
279 seq_puts(seq, ",gid=ignore");
280 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
281 seq_printf(seq, ",uid=%u", sbi->s_uid);
282 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
283 seq_printf(seq, ",gid=%u", sbi->s_gid);
284 if (sbi->s_umask != 0)
285 seq_printf(seq, ",umask=%o", sbi->s_umask);
286 if (sbi->s_fmode != UDF_INVALID_MODE)
287 seq_printf(seq, ",mode=%o", sbi->s_fmode);
288 if (sbi->s_dmode != UDF_INVALID_MODE)
289 seq_printf(seq, ",dmode=%o", sbi->s_dmode);
290 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
291 seq_printf(seq, ",session=%u", sbi->s_session);
292 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
293 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
294 if (sbi->s_anchor != 0)
295 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
296 /*
297 * volume, partition, fileset and rootdir seem to be ignored
298 * currently
299 */
300 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
301 seq_puts(seq, ",utf8");
302 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
303 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
304
305 return 0;
306 }
307
308 /*
309 * udf_parse_options
310 *
311 * PURPOSE
312 * Parse mount options.
313 *
314 * DESCRIPTION
315 * The following mount options are supported:
316 *
317 * gid= Set the default group.
318 * umask= Set the default umask.
319 * mode= Set the default file permissions.
320 * dmode= Set the default directory permissions.
321 * uid= Set the default user.
322 * bs= Set the block size.
323 * unhide Show otherwise hidden files.
324 * undelete Show deleted files in lists.
325 * adinicb Embed data in the inode (default)
326 * noadinicb Don't embed data in the inode
327 * shortad Use short ad's
328 * longad Use long ad's (default)
329 * nostrict Unset strict conformance
330 * iocharset= Set the NLS character set
331 *
332 * The remaining are for debugging and disaster recovery:
333 *
334 * novrs Skip volume sequence recognition
335 *
336 * The following expect a offset from 0.
337 *
338 * session= Set the CDROM session (default= last session)
339 * anchor= Override standard anchor location. (default= 256)
340 * volume= Override the VolumeDesc location. (unused)
341 * partition= Override the PartitionDesc location. (unused)
342 * lastblock= Set the last block of the filesystem/
343 *
344 * The following expect a offset from the partition root.
345 *
346 * fileset= Override the fileset block location. (unused)
347 * rootdir= Override the root directory location. (unused)
348 * WARNING: overriding the rootdir to a non-directory may
349 * yield highly unpredictable results.
350 *
351 * PRE-CONDITIONS
352 * options Pointer to mount options string.
353 * uopts Pointer to mount options variable.
354 *
355 * POST-CONDITIONS
356 * <return> 1 Mount options parsed okay.
357 * <return> 0 Error parsing mount options.
358 *
359 * HISTORY
360 * July 1, 1997 - Andrew E. Mileski
361 * Written, tested, and released.
362 */
363
364 enum {
365 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
366 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
367 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
368 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
369 Opt_rootdir, Opt_utf8, Opt_iocharset,
370 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
371 Opt_fmode, Opt_dmode
372 };
373
374 static const match_table_t tokens = {
375 {Opt_novrs, "novrs"},
376 {Opt_nostrict, "nostrict"},
377 {Opt_bs, "bs=%u"},
378 {Opt_unhide, "unhide"},
379 {Opt_undelete, "undelete"},
380 {Opt_noadinicb, "noadinicb"},
381 {Opt_adinicb, "adinicb"},
382 {Opt_shortad, "shortad"},
383 {Opt_longad, "longad"},
384 {Opt_uforget, "uid=forget"},
385 {Opt_uignore, "uid=ignore"},
386 {Opt_gforget, "gid=forget"},
387 {Opt_gignore, "gid=ignore"},
388 {Opt_gid, "gid=%u"},
389 {Opt_uid, "uid=%u"},
390 {Opt_umask, "umask=%o"},
391 {Opt_session, "session=%u"},
392 {Opt_lastblock, "lastblock=%u"},
393 {Opt_anchor, "anchor=%u"},
394 {Opt_volume, "volume=%u"},
395 {Opt_partition, "partition=%u"},
396 {Opt_fileset, "fileset=%u"},
397 {Opt_rootdir, "rootdir=%u"},
398 {Opt_utf8, "utf8"},
399 {Opt_iocharset, "iocharset=%s"},
400 {Opt_fmode, "mode=%o"},
401 {Opt_dmode, "dmode=%o"},
402 {Opt_err, NULL}
403 };
404
405 static int udf_parse_options(char *options, struct udf_options *uopt,
406 bool remount)
407 {
408 char *p;
409 int option;
410
411 uopt->novrs = 0;
412 uopt->partition = 0xFFFF;
413 uopt->session = 0xFFFFFFFF;
414 uopt->lastblock = 0;
415 uopt->anchor = 0;
416 uopt->volume = 0xFFFFFFFF;
417 uopt->rootdir = 0xFFFFFFFF;
418 uopt->fileset = 0xFFFFFFFF;
419 uopt->nls_map = NULL;
420
421 if (!options)
422 return 1;
423
424 while ((p = strsep(&options, ",")) != NULL) {
425 substring_t args[MAX_OPT_ARGS];
426 int token;
427 if (!*p)
428 continue;
429
430 token = match_token(p, tokens, args);
431 switch (token) {
432 case Opt_novrs:
433 uopt->novrs = 1;
434 break;
435 case Opt_bs:
436 if (match_int(&args[0], &option))
437 return 0;
438 uopt->blocksize = option;
439 uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
440 break;
441 case Opt_unhide:
442 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
443 break;
444 case Opt_undelete:
445 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
446 break;
447 case Opt_noadinicb:
448 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
449 break;
450 case Opt_adinicb:
451 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
452 break;
453 case Opt_shortad:
454 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
455 break;
456 case Opt_longad:
457 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
458 break;
459 case Opt_gid:
460 if (match_int(args, &option))
461 return 0;
462 uopt->gid = option;
463 uopt->flags |= (1 << UDF_FLAG_GID_SET);
464 break;
465 case Opt_uid:
466 if (match_int(args, &option))
467 return 0;
468 uopt->uid = option;
469 uopt->flags |= (1 << UDF_FLAG_UID_SET);
470 break;
471 case Opt_umask:
472 if (match_octal(args, &option))
473 return 0;
474 uopt->umask = option;
475 break;
476 case Opt_nostrict:
477 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
478 break;
479 case Opt_session:
480 if (match_int(args, &option))
481 return 0;
482 uopt->session = option;
483 if (!remount)
484 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
485 break;
486 case Opt_lastblock:
487 if (match_int(args, &option))
488 return 0;
489 uopt->lastblock = option;
490 if (!remount)
491 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
492 break;
493 case Opt_anchor:
494 if (match_int(args, &option))
495 return 0;
496 uopt->anchor = option;
497 break;
498 case Opt_volume:
499 if (match_int(args, &option))
500 return 0;
501 uopt->volume = option;
502 break;
503 case Opt_partition:
504 if (match_int(args, &option))
505 return 0;
506 uopt->partition = option;
507 break;
508 case Opt_fileset:
509 if (match_int(args, &option))
510 return 0;
511 uopt->fileset = option;
512 break;
513 case Opt_rootdir:
514 if (match_int(args, &option))
515 return 0;
516 uopt->rootdir = option;
517 break;
518 case Opt_utf8:
519 uopt->flags |= (1 << UDF_FLAG_UTF8);
520 break;
521 #ifdef CONFIG_UDF_NLS
522 case Opt_iocharset:
523 uopt->nls_map = load_nls(args[0].from);
524 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
525 break;
526 #endif
527 case Opt_uignore:
528 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
529 break;
530 case Opt_uforget:
531 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
532 break;
533 case Opt_gignore:
534 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
535 break;
536 case Opt_gforget:
537 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
538 break;
539 case Opt_fmode:
540 if (match_octal(args, &option))
541 return 0;
542 uopt->fmode = option & 0777;
543 break;
544 case Opt_dmode:
545 if (match_octal(args, &option))
546 return 0;
547 uopt->dmode = option & 0777;
548 break;
549 default:
550 pr_err("bad mount option \"%s\" or missing value\n", p);
551 return 0;
552 }
553 }
554 return 1;
555 }
556
557 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
558 {
559 struct udf_options uopt;
560 struct udf_sb_info *sbi = UDF_SB(sb);
561 int error = 0;
562
563 uopt.flags = sbi->s_flags;
564 uopt.uid = sbi->s_uid;
565 uopt.gid = sbi->s_gid;
566 uopt.umask = sbi->s_umask;
567 uopt.fmode = sbi->s_fmode;
568 uopt.dmode = sbi->s_dmode;
569
570 if (!udf_parse_options(options, &uopt, true))
571 return -EINVAL;
572
573 write_lock(&sbi->s_cred_lock);
574 sbi->s_flags = uopt.flags;
575 sbi->s_uid = uopt.uid;
576 sbi->s_gid = uopt.gid;
577 sbi->s_umask = uopt.umask;
578 sbi->s_fmode = uopt.fmode;
579 sbi->s_dmode = uopt.dmode;
580 write_unlock(&sbi->s_cred_lock);
581
582 if (sbi->s_lvid_bh) {
583 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
584 if (write_rev > UDF_MAX_WRITE_VERSION)
585 *flags |= MS_RDONLY;
586 }
587
588 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
589 goto out_unlock;
590
591 if (*flags & MS_RDONLY)
592 udf_close_lvid(sb);
593 else
594 udf_open_lvid(sb);
595
596 out_unlock:
597 return error;
598 }
599
600 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
601 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
602 static loff_t udf_check_vsd(struct super_block *sb)
603 {
604 struct volStructDesc *vsd = NULL;
605 loff_t sector = 32768;
606 int sectorsize;
607 struct buffer_head *bh = NULL;
608 int nsr02 = 0;
609 int nsr03 = 0;
610 struct udf_sb_info *sbi;
611
612 sbi = UDF_SB(sb);
613 if (sb->s_blocksize < sizeof(struct volStructDesc))
614 sectorsize = sizeof(struct volStructDesc);
615 else
616 sectorsize = sb->s_blocksize;
617
618 sector += (sbi->s_session << sb->s_blocksize_bits);
619
620 udf_debug("Starting at sector %u (%ld byte sectors)\n",
621 (unsigned int)(sector >> sb->s_blocksize_bits),
622 sb->s_blocksize);
623 /* Process the sequence (if applicable) */
624 for (; !nsr02 && !nsr03; sector += sectorsize) {
625 /* Read a block */
626 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
627 if (!bh)
628 break;
629
630 /* Look for ISO descriptors */
631 vsd = (struct volStructDesc *)(bh->b_data +
632 (sector & (sb->s_blocksize - 1)));
633
634 if (vsd->stdIdent[0] == 0) {
635 brelse(bh);
636 break;
637 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
638 VSD_STD_ID_LEN)) {
639 switch (vsd->structType) {
640 case 0:
641 udf_debug("ISO9660 Boot Record found\n");
642 break;
643 case 1:
644 udf_debug("ISO9660 Primary Volume Descriptor "
645 "found\n");
646 break;
647 case 2:
648 udf_debug("ISO9660 Supplementary Volume "
649 "Descriptor found\n");
650 break;
651 case 3:
652 udf_debug("ISO9660 Volume Partition Descriptor "
653 "found\n");
654 break;
655 case 255:
656 udf_debug("ISO9660 Volume Descriptor Set "
657 "Terminator found\n");
658 break;
659 default:
660 udf_debug("ISO9660 VRS (%u) found\n",
661 vsd->structType);
662 break;
663 }
664 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
665 VSD_STD_ID_LEN))
666 ; /* nothing */
667 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
668 VSD_STD_ID_LEN)) {
669 brelse(bh);
670 break;
671 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
672 VSD_STD_ID_LEN))
673 nsr02 = sector;
674 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
675 VSD_STD_ID_LEN))
676 nsr03 = sector;
677 brelse(bh);
678 }
679
680 if (nsr03)
681 return nsr03;
682 else if (nsr02)
683 return nsr02;
684 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
685 return -1;
686 else
687 return 0;
688 }
689
690 static int udf_find_fileset(struct super_block *sb,
691 struct kernel_lb_addr *fileset,
692 struct kernel_lb_addr *root)
693 {
694 struct buffer_head *bh = NULL;
695 long lastblock;
696 uint16_t ident;
697 struct udf_sb_info *sbi;
698
699 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
700 fileset->partitionReferenceNum != 0xFFFF) {
701 bh = udf_read_ptagged(sb, fileset, 0, &ident);
702
703 if (!bh) {
704 return 1;
705 } else if (ident != TAG_IDENT_FSD) {
706 brelse(bh);
707 return 1;
708 }
709
710 }
711
712 sbi = UDF_SB(sb);
713 if (!bh) {
714 /* Search backwards through the partitions */
715 struct kernel_lb_addr newfileset;
716
717 /* --> cvg: FIXME - is it reasonable? */
718 return 1;
719
720 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
721 (newfileset.partitionReferenceNum != 0xFFFF &&
722 fileset->logicalBlockNum == 0xFFFFFFFF &&
723 fileset->partitionReferenceNum == 0xFFFF);
724 newfileset.partitionReferenceNum--) {
725 lastblock = sbi->s_partmaps
726 [newfileset.partitionReferenceNum]
727 .s_partition_len;
728 newfileset.logicalBlockNum = 0;
729
730 do {
731 bh = udf_read_ptagged(sb, &newfileset, 0,
732 &ident);
733 if (!bh) {
734 newfileset.logicalBlockNum++;
735 continue;
736 }
737
738 switch (ident) {
739 case TAG_IDENT_SBD:
740 {
741 struct spaceBitmapDesc *sp;
742 sp = (struct spaceBitmapDesc *)
743 bh->b_data;
744 newfileset.logicalBlockNum += 1 +
745 ((le32_to_cpu(sp->numOfBytes) +
746 sizeof(struct spaceBitmapDesc)
747 - 1) >> sb->s_blocksize_bits);
748 brelse(bh);
749 break;
750 }
751 case TAG_IDENT_FSD:
752 *fileset = newfileset;
753 break;
754 default:
755 newfileset.logicalBlockNum++;
756 brelse(bh);
757 bh = NULL;
758 break;
759 }
760 } while (newfileset.logicalBlockNum < lastblock &&
761 fileset->logicalBlockNum == 0xFFFFFFFF &&
762 fileset->partitionReferenceNum == 0xFFFF);
763 }
764 }
765
766 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
767 fileset->partitionReferenceNum != 0xFFFF) && bh) {
768 udf_debug("Fileset at block=%d, partition=%d\n",
769 fileset->logicalBlockNum,
770 fileset->partitionReferenceNum);
771
772 sbi->s_partition = fileset->partitionReferenceNum;
773 udf_load_fileset(sb, bh, root);
774 brelse(bh);
775 return 0;
776 }
777 return 1;
778 }
779
780 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
781 {
782 struct primaryVolDesc *pvoldesc;
783 struct ustr *instr, *outstr;
784 struct buffer_head *bh;
785 uint16_t ident;
786 int ret = 1;
787
788 instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
789 if (!instr)
790 return 1;
791
792 outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
793 if (!outstr)
794 goto out1;
795
796 bh = udf_read_tagged(sb, block, block, &ident);
797 if (!bh)
798 goto out2;
799
800 BUG_ON(ident != TAG_IDENT_PVD);
801
802 pvoldesc = (struct primaryVolDesc *)bh->b_data;
803
804 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
805 pvoldesc->recordingDateAndTime)) {
806 #ifdef UDFFS_DEBUG
807 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
808 udf_debug("recording time %04u/%02u/%02u"
809 " %02u:%02u (%x)\n",
810 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
811 ts->minute, le16_to_cpu(ts->typeAndTimezone));
812 #endif
813 }
814
815 if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
816 if (udf_CS0toUTF8(outstr, instr)) {
817 strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
818 outstr->u_len > 31 ? 31 : outstr->u_len);
819 udf_debug("volIdent[] = '%s'\n",
820 UDF_SB(sb)->s_volume_ident);
821 }
822
823 if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
824 if (udf_CS0toUTF8(outstr, instr))
825 udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
826
827 brelse(bh);
828 ret = 0;
829 out2:
830 kfree(outstr);
831 out1:
832 kfree(instr);
833 return ret;
834 }
835
836 static int udf_load_metadata_files(struct super_block *sb, int partition)
837 {
838 struct udf_sb_info *sbi = UDF_SB(sb);
839 struct udf_part_map *map;
840 struct udf_meta_data *mdata;
841 struct kernel_lb_addr addr;
842 int fe_error = 0;
843
844 map = &sbi->s_partmaps[partition];
845 mdata = &map->s_type_specific.s_metadata;
846
847 /* metadata address */
848 addr.logicalBlockNum = mdata->s_meta_file_loc;
849 addr.partitionReferenceNum = map->s_partition_num;
850
851 udf_debug("Metadata file location: block = %d part = %d\n",
852 addr.logicalBlockNum, addr.partitionReferenceNum);
853
854 mdata->s_metadata_fe = udf_iget(sb, &addr);
855
856 if (mdata->s_metadata_fe == NULL) {
857 udf_warn(sb, "metadata inode efe not found, will try mirror inode\n");
858 fe_error = 1;
859 } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
860 ICBTAG_FLAG_AD_SHORT) {
861 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
862 fe_error = 1;
863 iput(mdata->s_metadata_fe);
864 mdata->s_metadata_fe = NULL;
865 }
866
867 /* mirror file entry */
868 addr.logicalBlockNum = mdata->s_mirror_file_loc;
869 addr.partitionReferenceNum = map->s_partition_num;
870
871 udf_debug("Mirror metadata file location: block = %d part = %d\n",
872 addr.logicalBlockNum, addr.partitionReferenceNum);
873
874 mdata->s_mirror_fe = udf_iget(sb, &addr);
875
876 if (mdata->s_mirror_fe == NULL) {
877 if (fe_error) {
878 udf_err(sb, "mirror inode efe not found and metadata inode is missing too, exiting...\n");
879 goto error_exit;
880 } else
881 udf_warn(sb, "mirror inode efe not found, but metadata inode is OK\n");
882 } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
883 ICBTAG_FLAG_AD_SHORT) {
884 udf_warn(sb, "mirror inode efe does not have short allocation descriptors!\n");
885 iput(mdata->s_mirror_fe);
886 mdata->s_mirror_fe = NULL;
887 if (fe_error)
888 goto error_exit;
889 }
890
891 /*
892 * bitmap file entry
893 * Note:
894 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
895 */
896 if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
897 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
898 addr.partitionReferenceNum = map->s_partition_num;
899
900 udf_debug("Bitmap file location: block = %d part = %d\n",
901 addr.logicalBlockNum, addr.partitionReferenceNum);
902
903 mdata->s_bitmap_fe = udf_iget(sb, &addr);
904
905 if (mdata->s_bitmap_fe == NULL) {
906 if (sb->s_flags & MS_RDONLY)
907 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
908 else {
909 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
910 goto error_exit;
911 }
912 }
913 }
914
915 udf_debug("udf_load_metadata_files Ok\n");
916
917 return 0;
918
919 error_exit:
920 return 1;
921 }
922
923 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
924 struct kernel_lb_addr *root)
925 {
926 struct fileSetDesc *fset;
927
928 fset = (struct fileSetDesc *)bh->b_data;
929
930 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
931
932 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
933
934 udf_debug("Rootdir at block=%d, partition=%d\n",
935 root->logicalBlockNum, root->partitionReferenceNum);
936 }
937
938 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
939 {
940 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
941 return DIV_ROUND_UP(map->s_partition_len +
942 (sizeof(struct spaceBitmapDesc) << 3),
943 sb->s_blocksize * 8);
944 }
945
946 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
947 {
948 struct udf_bitmap *bitmap;
949 int nr_groups;
950 int size;
951
952 nr_groups = udf_compute_nr_groups(sb, index);
953 size = sizeof(struct udf_bitmap) +
954 (sizeof(struct buffer_head *) * nr_groups);
955
956 if (size <= PAGE_SIZE)
957 bitmap = kzalloc(size, GFP_KERNEL);
958 else
959 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
960
961 if (bitmap == NULL) {
962 udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
963 nr_groups);
964 return NULL;
965 }
966
967 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
968 bitmap->s_nr_groups = nr_groups;
969 return bitmap;
970 }
971
972 static int udf_fill_partdesc_info(struct super_block *sb,
973 struct partitionDesc *p, int p_index)
974 {
975 struct udf_part_map *map;
976 struct udf_sb_info *sbi = UDF_SB(sb);
977 struct partitionHeaderDesc *phd;
978
979 map = &sbi->s_partmaps[p_index];
980
981 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
982 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
983
984 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
985 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
986 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
987 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
988 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
989 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
990 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
991 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
992
993 udf_debug("Partition (%d type %x) starts at physical %d, "
994 "block length %d\n", p_index,
995 map->s_partition_type, map->s_partition_root,
996 map->s_partition_len);
997
998 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
999 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1000 return 0;
1001
1002 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1003 if (phd->unallocSpaceTable.extLength) {
1004 struct kernel_lb_addr loc = {
1005 .logicalBlockNum = le32_to_cpu(
1006 phd->unallocSpaceTable.extPosition),
1007 .partitionReferenceNum = p_index,
1008 };
1009
1010 map->s_uspace.s_table = udf_iget(sb, &loc);
1011 if (!map->s_uspace.s_table) {
1012 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1013 p_index);
1014 return 1;
1015 }
1016 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1017 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1018 p_index, map->s_uspace.s_table->i_ino);
1019 }
1020
1021 if (phd->unallocSpaceBitmap.extLength) {
1022 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1023 if (!bitmap)
1024 return 1;
1025 map->s_uspace.s_bitmap = bitmap;
1026 bitmap->s_extLength = le32_to_cpu(
1027 phd->unallocSpaceBitmap.extLength);
1028 bitmap->s_extPosition = le32_to_cpu(
1029 phd->unallocSpaceBitmap.extPosition);
1030 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1031 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1032 bitmap->s_extPosition);
1033 }
1034
1035 if (phd->partitionIntegrityTable.extLength)
1036 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1037
1038 if (phd->freedSpaceTable.extLength) {
1039 struct kernel_lb_addr loc = {
1040 .logicalBlockNum = le32_to_cpu(
1041 phd->freedSpaceTable.extPosition),
1042 .partitionReferenceNum = p_index,
1043 };
1044
1045 map->s_fspace.s_table = udf_iget(sb, &loc);
1046 if (!map->s_fspace.s_table) {
1047 udf_debug("cannot load freedSpaceTable (part %d)\n",
1048 p_index);
1049 return 1;
1050 }
1051
1052 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1053 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1054 p_index, map->s_fspace.s_table->i_ino);
1055 }
1056
1057 if (phd->freedSpaceBitmap.extLength) {
1058 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1059 if (!bitmap)
1060 return 1;
1061 map->s_fspace.s_bitmap = bitmap;
1062 bitmap->s_extLength = le32_to_cpu(
1063 phd->freedSpaceBitmap.extLength);
1064 bitmap->s_extPosition = le32_to_cpu(
1065 phd->freedSpaceBitmap.extPosition);
1066 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1067 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1068 bitmap->s_extPosition);
1069 }
1070 return 0;
1071 }
1072
1073 static void udf_find_vat_block(struct super_block *sb, int p_index,
1074 int type1_index, sector_t start_block)
1075 {
1076 struct udf_sb_info *sbi = UDF_SB(sb);
1077 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1078 sector_t vat_block;
1079 struct kernel_lb_addr ino;
1080
1081 /*
1082 * VAT file entry is in the last recorded block. Some broken disks have
1083 * it a few blocks before so try a bit harder...
1084 */
1085 ino.partitionReferenceNum = type1_index;
1086 for (vat_block = start_block;
1087 vat_block >= map->s_partition_root &&
1088 vat_block >= start_block - 3 &&
1089 !sbi->s_vat_inode; vat_block--) {
1090 ino.logicalBlockNum = vat_block - map->s_partition_root;
1091 sbi->s_vat_inode = udf_iget(sb, &ino);
1092 }
1093 }
1094
1095 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1096 {
1097 struct udf_sb_info *sbi = UDF_SB(sb);
1098 struct udf_part_map *map = &sbi->s_partmaps[p_index];
1099 struct buffer_head *bh = NULL;
1100 struct udf_inode_info *vati;
1101 uint32_t pos;
1102 struct virtualAllocationTable20 *vat20;
1103 sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1104
1105 udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1106 if (!sbi->s_vat_inode &&
1107 sbi->s_last_block != blocks - 1) {
1108 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1109 (unsigned long)sbi->s_last_block,
1110 (unsigned long)blocks - 1);
1111 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1112 }
1113 if (!sbi->s_vat_inode)
1114 return 1;
1115
1116 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1117 map->s_type_specific.s_virtual.s_start_offset = 0;
1118 map->s_type_specific.s_virtual.s_num_entries =
1119 (sbi->s_vat_inode->i_size - 36) >> 2;
1120 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1121 vati = UDF_I(sbi->s_vat_inode);
1122 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1123 pos = udf_block_map(sbi->s_vat_inode, 0);
1124 bh = sb_bread(sb, pos);
1125 if (!bh)
1126 return 1;
1127 vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1128 } else {
1129 vat20 = (struct virtualAllocationTable20 *)
1130 vati->i_ext.i_data;
1131 }
1132
1133 map->s_type_specific.s_virtual.s_start_offset =
1134 le16_to_cpu(vat20->lengthHeader);
1135 map->s_type_specific.s_virtual.s_num_entries =
1136 (sbi->s_vat_inode->i_size -
1137 map->s_type_specific.s_virtual.
1138 s_start_offset) >> 2;
1139 brelse(bh);
1140 }
1141 return 0;
1142 }
1143
1144 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1145 {
1146 struct buffer_head *bh;
1147 struct partitionDesc *p;
1148 struct udf_part_map *map;
1149 struct udf_sb_info *sbi = UDF_SB(sb);
1150 int i, type1_idx;
1151 uint16_t partitionNumber;
1152 uint16_t ident;
1153 int ret = 0;
1154
1155 bh = udf_read_tagged(sb, block, block, &ident);
1156 if (!bh)
1157 return 1;
1158 if (ident != TAG_IDENT_PD)
1159 goto out_bh;
1160
1161 p = (struct partitionDesc *)bh->b_data;
1162 partitionNumber = le16_to_cpu(p->partitionNumber);
1163
1164 /* First scan for TYPE1, SPARABLE and METADATA partitions */
1165 for (i = 0; i < sbi->s_partitions; i++) {
1166 map = &sbi->s_partmaps[i];
1167 udf_debug("Searching map: (%d == %d)\n",
1168 map->s_partition_num, partitionNumber);
1169 if (map->s_partition_num == partitionNumber &&
1170 (map->s_partition_type == UDF_TYPE1_MAP15 ||
1171 map->s_partition_type == UDF_SPARABLE_MAP15))
1172 break;
1173 }
1174
1175 if (i >= sbi->s_partitions) {
1176 udf_debug("Partition (%d) not found in partition map\n",
1177 partitionNumber);
1178 goto out_bh;
1179 }
1180
1181 ret = udf_fill_partdesc_info(sb, p, i);
1182
1183 /*
1184 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1185 * PHYSICAL partitions are already set up
1186 */
1187 type1_idx = i;
1188 for (i = 0; i < sbi->s_partitions; i++) {
1189 map = &sbi->s_partmaps[i];
1190
1191 if (map->s_partition_num == partitionNumber &&
1192 (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1193 map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1194 map->s_partition_type == UDF_METADATA_MAP25))
1195 break;
1196 }
1197
1198 if (i >= sbi->s_partitions)
1199 goto out_bh;
1200
1201 ret = udf_fill_partdesc_info(sb, p, i);
1202 if (ret)
1203 goto out_bh;
1204
1205 if (map->s_partition_type == UDF_METADATA_MAP25) {
1206 ret = udf_load_metadata_files(sb, i);
1207 if (ret) {
1208 udf_err(sb, "error loading MetaData partition map %d\n",
1209 i);
1210 goto out_bh;
1211 }
1212 } else {
1213 ret = udf_load_vat(sb, i, type1_idx);
1214 if (ret)
1215 goto out_bh;
1216 /*
1217 * Mark filesystem read-only if we have a partition with
1218 * virtual map since we don't handle writing to it (we
1219 * overwrite blocks instead of relocating them).
1220 */
1221 sb->s_flags |= MS_RDONLY;
1222 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1223 }
1224 out_bh:
1225 /* In case loading failed, we handle cleanup in udf_fill_super */
1226 brelse(bh);
1227 return ret;
1228 }
1229
1230 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1231 struct kernel_lb_addr *fileset)
1232 {
1233 struct logicalVolDesc *lvd;
1234 int i, j, offset;
1235 uint8_t type;
1236 struct udf_sb_info *sbi = UDF_SB(sb);
1237 struct genericPartitionMap *gpm;
1238 uint16_t ident;
1239 struct buffer_head *bh;
1240 int ret = 0;
1241
1242 bh = udf_read_tagged(sb, block, block, &ident);
1243 if (!bh)
1244 return 1;
1245 BUG_ON(ident != TAG_IDENT_LVD);
1246 lvd = (struct logicalVolDesc *)bh->b_data;
1247
1248 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1249 if (i != 0) {
1250 ret = i;
1251 goto out_bh;
1252 }
1253
1254 for (i = 0, offset = 0;
1255 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1256 i++, offset += gpm->partitionMapLength) {
1257 struct udf_part_map *map = &sbi->s_partmaps[i];
1258 gpm = (struct genericPartitionMap *)
1259 &(lvd->partitionMaps[offset]);
1260 type = gpm->partitionMapType;
1261 if (type == 1) {
1262 struct genericPartitionMap1 *gpm1 =
1263 (struct genericPartitionMap1 *)gpm;
1264 map->s_partition_type = UDF_TYPE1_MAP15;
1265 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1266 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1267 map->s_partition_func = NULL;
1268 } else if (type == 2) {
1269 struct udfPartitionMap2 *upm2 =
1270 (struct udfPartitionMap2 *)gpm;
1271 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1272 strlen(UDF_ID_VIRTUAL))) {
1273 u16 suf =
1274 le16_to_cpu(((__le16 *)upm2->partIdent.
1275 identSuffix)[0]);
1276 if (suf < 0x0200) {
1277 map->s_partition_type =
1278 UDF_VIRTUAL_MAP15;
1279 map->s_partition_func =
1280 udf_get_pblock_virt15;
1281 } else {
1282 map->s_partition_type =
1283 UDF_VIRTUAL_MAP20;
1284 map->s_partition_func =
1285 udf_get_pblock_virt20;
1286 }
1287 } else if (!strncmp(upm2->partIdent.ident,
1288 UDF_ID_SPARABLE,
1289 strlen(UDF_ID_SPARABLE))) {
1290 uint32_t loc;
1291 struct sparingTable *st;
1292 struct sparablePartitionMap *spm =
1293 (struct sparablePartitionMap *)gpm;
1294
1295 map->s_partition_type = UDF_SPARABLE_MAP15;
1296 map->s_type_specific.s_sparing.s_packet_len =
1297 le16_to_cpu(spm->packetLength);
1298 for (j = 0; j < spm->numSparingTables; j++) {
1299 struct buffer_head *bh2;
1300
1301 loc = le32_to_cpu(
1302 spm->locSparingTable[j]);
1303 bh2 = udf_read_tagged(sb, loc, loc,
1304 &ident);
1305 map->s_type_specific.s_sparing.
1306 s_spar_map[j] = bh2;
1307
1308 if (bh2 == NULL)
1309 continue;
1310
1311 st = (struct sparingTable *)bh2->b_data;
1312 if (ident != 0 || strncmp(
1313 st->sparingIdent.ident,
1314 UDF_ID_SPARING,
1315 strlen(UDF_ID_SPARING))) {
1316 brelse(bh2);
1317 map->s_type_specific.s_sparing.
1318 s_spar_map[j] = NULL;
1319 }
1320 }
1321 map->s_partition_func = udf_get_pblock_spar15;
1322 } else if (!strncmp(upm2->partIdent.ident,
1323 UDF_ID_METADATA,
1324 strlen(UDF_ID_METADATA))) {
1325 struct udf_meta_data *mdata =
1326 &map->s_type_specific.s_metadata;
1327 struct metadataPartitionMap *mdm =
1328 (struct metadataPartitionMap *)
1329 &(lvd->partitionMaps[offset]);
1330 udf_debug("Parsing Logical vol part %d "
1331 "type %d id=%s\n", i, type,
1332 UDF_ID_METADATA);
1333
1334 map->s_partition_type = UDF_METADATA_MAP25;
1335 map->s_partition_func = udf_get_pblock_meta25;
1336
1337 mdata->s_meta_file_loc =
1338 le32_to_cpu(mdm->metadataFileLoc);
1339 mdata->s_mirror_file_loc =
1340 le32_to_cpu(mdm->metadataMirrorFileLoc);
1341 mdata->s_bitmap_file_loc =
1342 le32_to_cpu(mdm->metadataBitmapFileLoc);
1343 mdata->s_alloc_unit_size =
1344 le32_to_cpu(mdm->allocUnitSize);
1345 mdata->s_align_unit_size =
1346 le16_to_cpu(mdm->alignUnitSize);
1347 mdata->s_dup_md_flag =
1348 mdm->flags & 0x01;
1349
1350 udf_debug("Metadata Ident suffix=0x%x\n",
1351 (le16_to_cpu(
1352 ((__le16 *)
1353 mdm->partIdent.identSuffix)[0])));
1354 udf_debug("Metadata part num=%d\n",
1355 le16_to_cpu(mdm->partitionNum));
1356 udf_debug("Metadata part alloc unit size=%d\n",
1357 le32_to_cpu(mdm->allocUnitSize));
1358 udf_debug("Metadata file loc=%d\n",
1359 le32_to_cpu(mdm->metadataFileLoc));
1360 udf_debug("Mirror file loc=%d\n",
1361 le32_to_cpu(mdm->metadataMirrorFileLoc));
1362 udf_debug("Bitmap file loc=%d\n",
1363 le32_to_cpu(mdm->metadataBitmapFileLoc));
1364 udf_debug("Duplicate Flag: %d %d\n",
1365 mdata->s_dup_md_flag, mdm->flags);
1366 } else {
1367 udf_debug("Unknown ident: %s\n",
1368 upm2->partIdent.ident);
1369 continue;
1370 }
1371 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1372 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1373 }
1374 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1375 i, map->s_partition_num, type,
1376 map->s_volumeseqnum);
1377 }
1378
1379 if (fileset) {
1380 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1381
1382 *fileset = lelb_to_cpu(la->extLocation);
1383 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1384 "partition=%d\n", fileset->logicalBlockNum,
1385 fileset->partitionReferenceNum);
1386 }
1387 if (lvd->integritySeqExt.extLength)
1388 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1389
1390 out_bh:
1391 brelse(bh);
1392 return ret;
1393 }
1394
1395 /*
1396 * udf_load_logicalvolint
1397 *
1398 */
1399 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1400 {
1401 struct buffer_head *bh = NULL;
1402 uint16_t ident;
1403 struct udf_sb_info *sbi = UDF_SB(sb);
1404 struct logicalVolIntegrityDesc *lvid;
1405
1406 while (loc.extLength > 0 &&
1407 (bh = udf_read_tagged(sb, loc.extLocation,
1408 loc.extLocation, &ident)) &&
1409 ident == TAG_IDENT_LVID) {
1410 sbi->s_lvid_bh = bh;
1411 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1412
1413 if (lvid->nextIntegrityExt.extLength)
1414 udf_load_logicalvolint(sb,
1415 leea_to_cpu(lvid->nextIntegrityExt));
1416
1417 if (sbi->s_lvid_bh != bh)
1418 brelse(bh);
1419 loc.extLength -= sb->s_blocksize;
1420 loc.extLocation++;
1421 }
1422 if (sbi->s_lvid_bh != bh)
1423 brelse(bh);
1424 }
1425
1426 /*
1427 * udf_process_sequence
1428 *
1429 * PURPOSE
1430 * Process a main/reserve volume descriptor sequence.
1431 *
1432 * PRE-CONDITIONS
1433 * sb Pointer to _locked_ superblock.
1434 * block First block of first extent of the sequence.
1435 * lastblock Lastblock of first extent of the sequence.
1436 *
1437 * HISTORY
1438 * July 1, 1997 - Andrew E. Mileski
1439 * Written, tested, and released.
1440 */
1441 static noinline int udf_process_sequence(struct super_block *sb, long block,
1442 long lastblock, struct kernel_lb_addr *fileset)
1443 {
1444 struct buffer_head *bh = NULL;
1445 struct udf_vds_record vds[VDS_POS_LENGTH];
1446 struct udf_vds_record *curr;
1447 struct generic_desc *gd;
1448 struct volDescPtr *vdp;
1449 int done = 0;
1450 uint32_t vdsn;
1451 uint16_t ident;
1452 long next_s = 0, next_e = 0;
1453
1454 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1455
1456 /*
1457 * Read the main descriptor sequence and find which descriptors
1458 * are in it.
1459 */
1460 for (; (!done && block <= lastblock); block++) {
1461
1462 bh = udf_read_tagged(sb, block, block, &ident);
1463 if (!bh) {
1464 udf_err(sb,
1465 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1466 (unsigned long long)block);
1467 return 1;
1468 }
1469
1470 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1471 gd = (struct generic_desc *)bh->b_data;
1472 vdsn = le32_to_cpu(gd->volDescSeqNum);
1473 switch (ident) {
1474 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1475 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1476 if (vdsn >= curr->volDescSeqNum) {
1477 curr->volDescSeqNum = vdsn;
1478 curr->block = block;
1479 }
1480 break;
1481 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1482 curr = &vds[VDS_POS_VOL_DESC_PTR];
1483 if (vdsn >= curr->volDescSeqNum) {
1484 curr->volDescSeqNum = vdsn;
1485 curr->block = block;
1486
1487 vdp = (struct volDescPtr *)bh->b_data;
1488 next_s = le32_to_cpu(
1489 vdp->nextVolDescSeqExt.extLocation);
1490 next_e = le32_to_cpu(
1491 vdp->nextVolDescSeqExt.extLength);
1492 next_e = next_e >> sb->s_blocksize_bits;
1493 next_e += next_s;
1494 }
1495 break;
1496 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1497 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1498 if (vdsn >= curr->volDescSeqNum) {
1499 curr->volDescSeqNum = vdsn;
1500 curr->block = block;
1501 }
1502 break;
1503 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1504 curr = &vds[VDS_POS_PARTITION_DESC];
1505 if (!curr->block)
1506 curr->block = block;
1507 break;
1508 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1509 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1510 if (vdsn >= curr->volDescSeqNum) {
1511 curr->volDescSeqNum = vdsn;
1512 curr->block = block;
1513 }
1514 break;
1515 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1516 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1517 if (vdsn >= curr->volDescSeqNum) {
1518 curr->volDescSeqNum = vdsn;
1519 curr->block = block;
1520 }
1521 break;
1522 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1523 vds[VDS_POS_TERMINATING_DESC].block = block;
1524 if (next_e) {
1525 block = next_s;
1526 lastblock = next_e;
1527 next_s = next_e = 0;
1528 } else
1529 done = 1;
1530 break;
1531 }
1532 brelse(bh);
1533 }
1534 /*
1535 * Now read interesting descriptors again and process them
1536 * in a suitable order
1537 */
1538 if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1539 udf_err(sb, "Primary Volume Descriptor not found!\n");
1540 return 1;
1541 }
1542 if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1543 return 1;
1544
1545 if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1546 vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1547 return 1;
1548
1549 if (vds[VDS_POS_PARTITION_DESC].block) {
1550 /*
1551 * We rescan the whole descriptor sequence to find
1552 * partition descriptor blocks and process them.
1553 */
1554 for (block = vds[VDS_POS_PARTITION_DESC].block;
1555 block < vds[VDS_POS_TERMINATING_DESC].block;
1556 block++)
1557 if (udf_load_partdesc(sb, block))
1558 return 1;
1559 }
1560
1561 return 0;
1562 }
1563
1564 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1565 struct kernel_lb_addr *fileset)
1566 {
1567 struct anchorVolDescPtr *anchor;
1568 long main_s, main_e, reserve_s, reserve_e;
1569
1570 anchor = (struct anchorVolDescPtr *)bh->b_data;
1571
1572 /* Locate the main sequence */
1573 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1574 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1575 main_e = main_e >> sb->s_blocksize_bits;
1576 main_e += main_s;
1577
1578 /* Locate the reserve sequence */
1579 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1580 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1581 reserve_e = reserve_e >> sb->s_blocksize_bits;
1582 reserve_e += reserve_s;
1583
1584 /* Process the main & reserve sequences */
1585 /* responsible for finding the PartitionDesc(s) */
1586 if (!udf_process_sequence(sb, main_s, main_e, fileset))
1587 return 1;
1588 return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1589 }
1590
1591 /*
1592 * Check whether there is an anchor block in the given block and
1593 * load Volume Descriptor Sequence if so.
1594 */
1595 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1596 struct kernel_lb_addr *fileset)
1597 {
1598 struct buffer_head *bh;
1599 uint16_t ident;
1600 int ret;
1601
1602 if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1603 udf_fixed_to_variable(block) >=
1604 sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1605 return 0;
1606
1607 bh = udf_read_tagged(sb, block, block, &ident);
1608 if (!bh)
1609 return 0;
1610 if (ident != TAG_IDENT_AVDP) {
1611 brelse(bh);
1612 return 0;
1613 }
1614 ret = udf_load_sequence(sb, bh, fileset);
1615 brelse(bh);
1616 return ret;
1617 }
1618
1619 /* Search for an anchor volume descriptor pointer */
1620 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1621 struct kernel_lb_addr *fileset)
1622 {
1623 sector_t last[6];
1624 int i;
1625 struct udf_sb_info *sbi = UDF_SB(sb);
1626 int last_count = 0;
1627
1628 /* First try user provided anchor */
1629 if (sbi->s_anchor) {
1630 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1631 return lastblock;
1632 }
1633 /*
1634 * according to spec, anchor is in either:
1635 * block 256
1636 * lastblock-256
1637 * lastblock
1638 * however, if the disc isn't closed, it could be 512.
1639 */
1640 if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1641 return lastblock;
1642 /*
1643 * The trouble is which block is the last one. Drives often misreport
1644 * this so we try various possibilities.
1645 */
1646 last[last_count++] = lastblock;
1647 if (lastblock >= 1)
1648 last[last_count++] = lastblock - 1;
1649 last[last_count++] = lastblock + 1;
1650 if (lastblock >= 2)
1651 last[last_count++] = lastblock - 2;
1652 if (lastblock >= 150)
1653 last[last_count++] = lastblock - 150;
1654 if (lastblock >= 152)
1655 last[last_count++] = lastblock - 152;
1656
1657 for (i = 0; i < last_count; i++) {
1658 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1659 sb->s_blocksize_bits)
1660 continue;
1661 if (udf_check_anchor_block(sb, last[i], fileset))
1662 return last[i];
1663 if (last[i] < 256)
1664 continue;
1665 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1666 return last[i];
1667 }
1668
1669 /* Finally try block 512 in case media is open */
1670 if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1671 return last[0];
1672 return 0;
1673 }
1674
1675 /*
1676 * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1677 * area specified by it. The function expects sbi->s_lastblock to be the last
1678 * block on the media.
1679 *
1680 * Return 1 if ok, 0 if not found.
1681 *
1682 */
1683 static int udf_find_anchor(struct super_block *sb,
1684 struct kernel_lb_addr *fileset)
1685 {
1686 sector_t lastblock;
1687 struct udf_sb_info *sbi = UDF_SB(sb);
1688
1689 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1690 if (lastblock)
1691 goto out;
1692
1693 /* No anchor found? Try VARCONV conversion of block numbers */
1694 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1695 /* Firstly, we try to not convert number of the last block */
1696 lastblock = udf_scan_anchors(sb,
1697 udf_variable_to_fixed(sbi->s_last_block),
1698 fileset);
1699 if (lastblock)
1700 goto out;
1701
1702 /* Secondly, we try with converted number of the last block */
1703 lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1704 if (!lastblock) {
1705 /* VARCONV didn't help. Clear it. */
1706 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1707 return 0;
1708 }
1709 out:
1710 sbi->s_last_block = lastblock;
1711 return 1;
1712 }
1713
1714 /*
1715 * Check Volume Structure Descriptor, find Anchor block and load Volume
1716 * Descriptor Sequence
1717 */
1718 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1719 int silent, struct kernel_lb_addr *fileset)
1720 {
1721 struct udf_sb_info *sbi = UDF_SB(sb);
1722 loff_t nsr_off;
1723
1724 if (!sb_set_blocksize(sb, uopt->blocksize)) {
1725 if (!silent)
1726 udf_warn(sb, "Bad block size\n");
1727 return 0;
1728 }
1729 sbi->s_last_block = uopt->lastblock;
1730 if (!uopt->novrs) {
1731 /* Check that it is NSR02 compliant */
1732 nsr_off = udf_check_vsd(sb);
1733 if (!nsr_off) {
1734 if (!silent)
1735 udf_warn(sb, "No VRS found\n");
1736 return 0;
1737 }
1738 if (nsr_off == -1)
1739 udf_debug("Failed to read byte 32768. Assuming open "
1740 "disc. Skipping validity check\n");
1741 if (!sbi->s_last_block)
1742 sbi->s_last_block = udf_get_last_block(sb);
1743 } else {
1744 udf_debug("Validity check skipped because of novrs option\n");
1745 }
1746
1747 /* Look for anchor block and load Volume Descriptor Sequence */
1748 sbi->s_anchor = uopt->anchor;
1749 if (!udf_find_anchor(sb, fileset)) {
1750 if (!silent)
1751 udf_warn(sb, "No anchor found\n");
1752 return 0;
1753 }
1754 return 1;
1755 }
1756
1757 static void udf_open_lvid(struct super_block *sb)
1758 {
1759 struct udf_sb_info *sbi = UDF_SB(sb);
1760 struct buffer_head *bh = sbi->s_lvid_bh;
1761 struct logicalVolIntegrityDesc *lvid;
1762 struct logicalVolIntegrityDescImpUse *lvidiu;
1763
1764 if (!bh)
1765 return;
1766
1767 mutex_lock(&sbi->s_alloc_mutex);
1768 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1769 lvidiu = udf_sb_lvidiu(sbi);
1770
1771 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1772 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1773 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1774 CURRENT_TIME);
1775 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1776
1777 lvid->descTag.descCRC = cpu_to_le16(
1778 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1779 le16_to_cpu(lvid->descTag.descCRCLength)));
1780
1781 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1782 mark_buffer_dirty(bh);
1783 sbi->s_lvid_dirty = 0;
1784 mutex_unlock(&sbi->s_alloc_mutex);
1785 }
1786
1787 static void udf_close_lvid(struct super_block *sb)
1788 {
1789 struct udf_sb_info *sbi = UDF_SB(sb);
1790 struct buffer_head *bh = sbi->s_lvid_bh;
1791 struct logicalVolIntegrityDesc *lvid;
1792 struct logicalVolIntegrityDescImpUse *lvidiu;
1793
1794 if (!bh)
1795 return;
1796
1797 mutex_lock(&sbi->s_alloc_mutex);
1798 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1799 lvidiu = udf_sb_lvidiu(sbi);
1800 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1801 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1802 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1803 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1804 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1805 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1806 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1807 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1808 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1809 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1810
1811 lvid->descTag.descCRC = cpu_to_le16(
1812 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1813 le16_to_cpu(lvid->descTag.descCRCLength)));
1814
1815 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1816 mark_buffer_dirty(bh);
1817 sbi->s_lvid_dirty = 0;
1818 mutex_unlock(&sbi->s_alloc_mutex);
1819 }
1820
1821 u64 lvid_get_unique_id(struct super_block *sb)
1822 {
1823 struct buffer_head *bh;
1824 struct udf_sb_info *sbi = UDF_SB(sb);
1825 struct logicalVolIntegrityDesc *lvid;
1826 struct logicalVolHeaderDesc *lvhd;
1827 u64 uniqueID;
1828 u64 ret;
1829
1830 bh = sbi->s_lvid_bh;
1831 if (!bh)
1832 return 0;
1833
1834 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1835 lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1836
1837 mutex_lock(&sbi->s_alloc_mutex);
1838 ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1839 if (!(++uniqueID & 0xFFFFFFFF))
1840 uniqueID += 16;
1841 lvhd->uniqueID = cpu_to_le64(uniqueID);
1842 mutex_unlock(&sbi->s_alloc_mutex);
1843 mark_buffer_dirty(bh);
1844
1845 return ret;
1846 }
1847
1848 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1849 {
1850 int i;
1851 int nr_groups = bitmap->s_nr_groups;
1852 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1853 nr_groups);
1854
1855 for (i = 0; i < nr_groups; i++)
1856 if (bitmap->s_block_bitmap[i])
1857 brelse(bitmap->s_block_bitmap[i]);
1858
1859 if (size <= PAGE_SIZE)
1860 kfree(bitmap);
1861 else
1862 vfree(bitmap);
1863 }
1864
1865 static void udf_free_partition(struct udf_part_map *map)
1866 {
1867 int i;
1868 struct udf_meta_data *mdata;
1869
1870 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1871 iput(map->s_uspace.s_table);
1872 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1873 iput(map->s_fspace.s_table);
1874 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1875 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1876 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1877 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1878 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1879 for (i = 0; i < 4; i++)
1880 brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1881 else if (map->s_partition_type == UDF_METADATA_MAP25) {
1882 mdata = &map->s_type_specific.s_metadata;
1883 iput(mdata->s_metadata_fe);
1884 mdata->s_metadata_fe = NULL;
1885
1886 iput(mdata->s_mirror_fe);
1887 mdata->s_mirror_fe = NULL;
1888
1889 iput(mdata->s_bitmap_fe);
1890 mdata->s_bitmap_fe = NULL;
1891 }
1892 }
1893
1894 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1895 {
1896 int i;
1897 int ret;
1898 struct inode *inode = NULL;
1899 struct udf_options uopt;
1900 struct kernel_lb_addr rootdir, fileset;
1901 struct udf_sb_info *sbi;
1902
1903 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1904 uopt.uid = -1;
1905 uopt.gid = -1;
1906 uopt.umask = 0;
1907 uopt.fmode = UDF_INVALID_MODE;
1908 uopt.dmode = UDF_INVALID_MODE;
1909
1910 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1911 if (!sbi)
1912 return -ENOMEM;
1913
1914 sb->s_fs_info = sbi;
1915
1916 mutex_init(&sbi->s_alloc_mutex);
1917
1918 if (!udf_parse_options((char *)options, &uopt, false))
1919 goto error_out;
1920
1921 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1922 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1923 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1924 goto error_out;
1925 }
1926 #ifdef CONFIG_UDF_NLS
1927 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1928 uopt.nls_map = load_nls_default();
1929 if (!uopt.nls_map)
1930 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1931 else
1932 udf_debug("Using default NLS map\n");
1933 }
1934 #endif
1935 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1936 uopt.flags |= (1 << UDF_FLAG_UTF8);
1937
1938 fileset.logicalBlockNum = 0xFFFFFFFF;
1939 fileset.partitionReferenceNum = 0xFFFF;
1940
1941 sbi->s_flags = uopt.flags;
1942 sbi->s_uid = uopt.uid;
1943 sbi->s_gid = uopt.gid;
1944 sbi->s_umask = uopt.umask;
1945 sbi->s_fmode = uopt.fmode;
1946 sbi->s_dmode = uopt.dmode;
1947 sbi->s_nls_map = uopt.nls_map;
1948 rwlock_init(&sbi->s_cred_lock);
1949
1950 if (uopt.session == 0xFFFFFFFF)
1951 sbi->s_session = udf_get_last_session(sb);
1952 else
1953 sbi->s_session = uopt.session;
1954
1955 udf_debug("Multi-session=%d\n", sbi->s_session);
1956
1957 /* Fill in the rest of the superblock */
1958 sb->s_op = &udf_sb_ops;
1959 sb->s_export_op = &udf_export_ops;
1960
1961 sb->s_dirt = 0;
1962 sb->s_magic = UDF_SUPER_MAGIC;
1963 sb->s_time_gran = 1000;
1964
1965 if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1966 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1967 } else {
1968 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1969 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1970 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1971 if (!silent)
1972 pr_notice("Rescanning with blocksize %d\n",
1973 UDF_DEFAULT_BLOCKSIZE);
1974 uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1975 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1976 }
1977 }
1978 if (!ret) {
1979 udf_warn(sb, "No partition found (1)\n");
1980 goto error_out;
1981 }
1982
1983 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1984
1985 if (sbi->s_lvid_bh) {
1986 struct logicalVolIntegrityDescImpUse *lvidiu =
1987 udf_sb_lvidiu(sbi);
1988 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1989 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1990 /* uint16_t maxUDFWriteRev =
1991 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1992
1993 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1994 udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
1995 le16_to_cpu(lvidiu->minUDFReadRev),
1996 UDF_MAX_READ_VERSION);
1997 goto error_out;
1998 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1999 sb->s_flags |= MS_RDONLY;
2000
2001 sbi->s_udfrev = minUDFWriteRev;
2002
2003 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
2004 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
2005 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
2006 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2007 }
2008
2009 if (!sbi->s_partitions) {
2010 udf_warn(sb, "No partition found (2)\n");
2011 goto error_out;
2012 }
2013
2014 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2015 UDF_PART_FLAG_READ_ONLY) {
2016 pr_notice("Partition marked readonly; forcing readonly mount\n");
2017 sb->s_flags |= MS_RDONLY;
2018 }
2019
2020 if (udf_find_fileset(sb, &fileset, &rootdir)) {
2021 udf_warn(sb, "No fileset found\n");
2022 goto error_out;
2023 }
2024
2025 if (!silent) {
2026 struct timestamp ts;
2027 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2028 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2029 sbi->s_volume_ident,
2030 le16_to_cpu(ts.year), ts.month, ts.day,
2031 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2032 }
2033 if (!(sb->s_flags & MS_RDONLY))
2034 udf_open_lvid(sb);
2035
2036 /* Assign the root inode */
2037 /* assign inodes by physical block number */
2038 /* perhaps it's not extensible enough, but for now ... */
2039 inode = udf_iget(sb, &rootdir);
2040 if (!inode) {
2041 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2042 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2043 goto error_out;
2044 }
2045
2046 /* Allocate a dentry for the root inode */
2047 sb->s_root = d_alloc_root(inode);
2048 if (!sb->s_root) {
2049 udf_err(sb, "Couldn't allocate root dentry\n");
2050 iput(inode);
2051 goto error_out;
2052 }
2053 sb->s_maxbytes = MAX_LFS_FILESIZE;
2054 return 0;
2055
2056 error_out:
2057 if (sbi->s_vat_inode)
2058 iput(sbi->s_vat_inode);
2059 if (sbi->s_partitions)
2060 for (i = 0; i < sbi->s_partitions; i++)
2061 udf_free_partition(&sbi->s_partmaps[i]);
2062 #ifdef CONFIG_UDF_NLS
2063 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2064 unload_nls(sbi->s_nls_map);
2065 #endif
2066 if (!(sb->s_flags & MS_RDONLY))
2067 udf_close_lvid(sb);
2068 brelse(sbi->s_lvid_bh);
2069
2070 kfree(sbi->s_partmaps);
2071 kfree(sbi);
2072 sb->s_fs_info = NULL;
2073
2074 return -EINVAL;
2075 }
2076
2077 void _udf_err(struct super_block *sb, const char *function,
2078 const char *fmt, ...)
2079 {
2080 va_list args;
2081
2082 if (!(sb->s_flags & MS_RDONLY)) {
2083 /* mark sb error */
2084 sb->s_dirt = 1;
2085 }
2086 va_start(args, fmt);
2087 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2088 va_end(args);
2089 pr_crit("error (device %s): %s: %s",
2090 sb->s_id, function, error_buf);
2091 }
2092
2093 void _udf_warn(struct super_block *sb, const char *function,
2094 const char *fmt, ...)
2095 {
2096 va_list args;
2097
2098 va_start(args, fmt);
2099 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2100 va_end(args);
2101 pr_warn("warning (device %s): %s: %s",
2102 sb->s_id, function, error_buf);
2103 }
2104
2105 static void udf_put_super(struct super_block *sb)
2106 {
2107 int i;
2108 struct udf_sb_info *sbi;
2109
2110 sbi = UDF_SB(sb);
2111
2112 if (sbi->s_vat_inode)
2113 iput(sbi->s_vat_inode);
2114 if (sbi->s_partitions)
2115 for (i = 0; i < sbi->s_partitions; i++)
2116 udf_free_partition(&sbi->s_partmaps[i]);
2117 #ifdef CONFIG_UDF_NLS
2118 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2119 unload_nls(sbi->s_nls_map);
2120 #endif
2121 if (!(sb->s_flags & MS_RDONLY))
2122 udf_close_lvid(sb);
2123 brelse(sbi->s_lvid_bh);
2124 kfree(sbi->s_partmaps);
2125 kfree(sb->s_fs_info);
2126 sb->s_fs_info = NULL;
2127 }
2128
2129 static int udf_sync_fs(struct super_block *sb, int wait)
2130 {
2131 struct udf_sb_info *sbi = UDF_SB(sb);
2132
2133 mutex_lock(&sbi->s_alloc_mutex);
2134 if (sbi->s_lvid_dirty) {
2135 /*
2136 * Blockdevice will be synced later so we don't have to submit
2137 * the buffer for IO
2138 */
2139 mark_buffer_dirty(sbi->s_lvid_bh);
2140 sb->s_dirt = 0;
2141 sbi->s_lvid_dirty = 0;
2142 }
2143 mutex_unlock(&sbi->s_alloc_mutex);
2144
2145 return 0;
2146 }
2147
2148 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2149 {
2150 struct super_block *sb = dentry->d_sb;
2151 struct udf_sb_info *sbi = UDF_SB(sb);
2152 struct logicalVolIntegrityDescImpUse *lvidiu;
2153 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2154
2155 if (sbi->s_lvid_bh != NULL)
2156 lvidiu = udf_sb_lvidiu(sbi);
2157 else
2158 lvidiu = NULL;
2159
2160 buf->f_type = UDF_SUPER_MAGIC;
2161 buf->f_bsize = sb->s_blocksize;
2162 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2163 buf->f_bfree = udf_count_free(sb);
2164 buf->f_bavail = buf->f_bfree;
2165 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2166 le32_to_cpu(lvidiu->numDirs)) : 0)
2167 + buf->f_bfree;
2168 buf->f_ffree = buf->f_bfree;
2169 buf->f_namelen = UDF_NAME_LEN - 2;
2170 buf->f_fsid.val[0] = (u32)id;
2171 buf->f_fsid.val[1] = (u32)(id >> 32);
2172
2173 return 0;
2174 }
2175
2176 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2177 struct udf_bitmap *bitmap)
2178 {
2179 struct buffer_head *bh = NULL;
2180 unsigned int accum = 0;
2181 int index;
2182 int block = 0, newblock;
2183 struct kernel_lb_addr loc;
2184 uint32_t bytes;
2185 uint8_t *ptr;
2186 uint16_t ident;
2187 struct spaceBitmapDesc *bm;
2188
2189 loc.logicalBlockNum = bitmap->s_extPosition;
2190 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2191 bh = udf_read_ptagged(sb, &loc, 0, &ident);
2192
2193 if (!bh) {
2194 udf_err(sb, "udf_count_free failed\n");
2195 goto out;
2196 } else if (ident != TAG_IDENT_SBD) {
2197 brelse(bh);
2198 udf_err(sb, "udf_count_free failed\n");
2199 goto out;
2200 }
2201
2202 bm = (struct spaceBitmapDesc *)bh->b_data;
2203 bytes = le32_to_cpu(bm->numOfBytes);
2204 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2205 ptr = (uint8_t *)bh->b_data;
2206
2207 while (bytes > 0) {
2208 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2209 accum += bitmap_weight((const unsigned long *)(ptr + index),
2210 cur_bytes * 8);
2211 bytes -= cur_bytes;
2212 if (bytes) {
2213 brelse(bh);
2214 newblock = udf_get_lb_pblock(sb, &loc, ++block);
2215 bh = udf_tread(sb, newblock);
2216 if (!bh) {
2217 udf_debug("read failed\n");
2218 goto out;
2219 }
2220 index = 0;
2221 ptr = (uint8_t *)bh->b_data;
2222 }
2223 }
2224 brelse(bh);
2225 out:
2226 return accum;
2227 }
2228
2229 static unsigned int udf_count_free_table(struct super_block *sb,
2230 struct inode *table)
2231 {
2232 unsigned int accum = 0;
2233 uint32_t elen;
2234 struct kernel_lb_addr eloc;
2235 int8_t etype;
2236 struct extent_position epos;
2237
2238 mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2239 epos.block = UDF_I(table)->i_location;
2240 epos.offset = sizeof(struct unallocSpaceEntry);
2241 epos.bh = NULL;
2242
2243 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2244 accum += (elen >> table->i_sb->s_blocksize_bits);
2245
2246 brelse(epos.bh);
2247 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2248
2249 return accum;
2250 }
2251
2252 static unsigned int udf_count_free(struct super_block *sb)
2253 {
2254 unsigned int accum = 0;
2255 struct udf_sb_info *sbi;
2256 struct udf_part_map *map;
2257
2258 sbi = UDF_SB(sb);
2259 if (sbi->s_lvid_bh) {
2260 struct logicalVolIntegrityDesc *lvid =
2261 (struct logicalVolIntegrityDesc *)
2262 sbi->s_lvid_bh->b_data;
2263 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2264 accum = le32_to_cpu(
2265 lvid->freeSpaceTable[sbi->s_partition]);
2266 if (accum == 0xFFFFFFFF)
2267 accum = 0;
2268 }
2269 }
2270
2271 if (accum)
2272 return accum;
2273
2274 map = &sbi->s_partmaps[sbi->s_partition];
2275 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2276 accum += udf_count_free_bitmap(sb,
2277 map->s_uspace.s_bitmap);
2278 }
2279 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2280 accum += udf_count_free_bitmap(sb,
2281 map->s_fspace.s_bitmap);
2282 }
2283 if (accum)
2284 return accum;
2285
2286 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2287 accum += udf_count_free_table(sb,
2288 map->s_uspace.s_table);
2289 }
2290 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2291 accum += udf_count_free_table(sb,
2292 map->s_fspace.s_table);
2293 }
2294
2295 return accum;
2296 }
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