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udf: Mark udf_process_sequence() as noinline
[deliverable/linux.git] / fs / udf / super.c
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/smp_lock.h>
52 #include <linux/buffer_head.h>
53 #include <linux/vfs.h>
54 #include <linux/vmalloc.h>
55 #include <linux/errno.h>
56 #include <linux/mount.h>
57 #include <linux/seq_file.h>
58 #include <linux/bitmap.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 void udf_write_super(struct super_block *);
84 static int udf_remount_fs(struct super_block *, int *, char *);
85 static int udf_check_valid(struct super_block *, int, int);
86 static int udf_vrs(struct super_block *sb, int silent);
87 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
88 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
89 kernel_lb_addr *);
90 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
91 static void udf_find_anchor(struct super_block *);
92 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
93 kernel_lb_addr *);
94 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
95 static void udf_load_fileset(struct super_block *, struct buffer_head *,
96 kernel_lb_addr *);
97 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
98 static void udf_open_lvid(struct super_block *);
99 static void udf_close_lvid(struct super_block *);
100 static unsigned int udf_count_free(struct super_block *);
101 static int udf_statfs(struct dentry *, struct kstatfs *);
102 static int udf_show_options(struct seq_file *, struct vfsmount *);
103 static void udf_error(struct super_block *sb, const char *function,
104 const char *fmt, ...);
105
106 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
107 {
108 struct logicalVolIntegrityDesc *lvid =
109 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
110 __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
111 __u32 offset = number_of_partitions * 2 *
112 sizeof(uint32_t)/sizeof(uint8_t);
113 return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
114 }
115
116 /* UDF filesystem type */
117 static int udf_get_sb(struct file_system_type *fs_type,
118 int flags, const char *dev_name, void *data,
119 struct vfsmount *mnt)
120 {
121 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
122 }
123
124 static struct file_system_type udf_fstype = {
125 .owner = THIS_MODULE,
126 .name = "udf",
127 .get_sb = udf_get_sb,
128 .kill_sb = kill_block_super,
129 .fs_flags = FS_REQUIRES_DEV,
130 };
131
132 static struct kmem_cache *udf_inode_cachep;
133
134 static struct inode *udf_alloc_inode(struct super_block *sb)
135 {
136 struct udf_inode_info *ei;
137 ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
138 if (!ei)
139 return NULL;
140
141 ei->i_unique = 0;
142 ei->i_lenExtents = 0;
143 ei->i_next_alloc_block = 0;
144 ei->i_next_alloc_goal = 0;
145 ei->i_strat4096 = 0;
146
147 return &ei->vfs_inode;
148 }
149
150 static void udf_destroy_inode(struct inode *inode)
151 {
152 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
153 }
154
155 static void init_once(struct kmem_cache *cachep, void *foo)
156 {
157 struct udf_inode_info *ei = (struct udf_inode_info *)foo;
158
159 ei->i_ext.i_data = NULL;
160 inode_init_once(&ei->vfs_inode);
161 }
162
163 static int init_inodecache(void)
164 {
165 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
166 sizeof(struct udf_inode_info),
167 0, (SLAB_RECLAIM_ACCOUNT |
168 SLAB_MEM_SPREAD),
169 init_once);
170 if (!udf_inode_cachep)
171 return -ENOMEM;
172 return 0;
173 }
174
175 static void destroy_inodecache(void)
176 {
177 kmem_cache_destroy(udf_inode_cachep);
178 }
179
180 /* Superblock operations */
181 static const struct super_operations udf_sb_ops = {
182 .alloc_inode = udf_alloc_inode,
183 .destroy_inode = udf_destroy_inode,
184 .write_inode = udf_write_inode,
185 .delete_inode = udf_delete_inode,
186 .clear_inode = udf_clear_inode,
187 .put_super = udf_put_super,
188 .write_super = udf_write_super,
189 .statfs = udf_statfs,
190 .remount_fs = udf_remount_fs,
191 .show_options = udf_show_options,
192 };
193
194 struct udf_options {
195 unsigned char novrs;
196 unsigned int blocksize;
197 unsigned int session;
198 unsigned int lastblock;
199 unsigned int anchor;
200 unsigned int volume;
201 unsigned short partition;
202 unsigned int fileset;
203 unsigned int rootdir;
204 unsigned int flags;
205 mode_t umask;
206 gid_t gid;
207 uid_t uid;
208 struct nls_table *nls_map;
209 };
210
211 static int __init init_udf_fs(void)
212 {
213 int err;
214
215 err = init_inodecache();
216 if (err)
217 goto out1;
218 err = register_filesystem(&udf_fstype);
219 if (err)
220 goto out;
221
222 return 0;
223
224 out:
225 destroy_inodecache();
226
227 out1:
228 return err;
229 }
230
231 static void __exit exit_udf_fs(void)
232 {
233 unregister_filesystem(&udf_fstype);
234 destroy_inodecache();
235 }
236
237 module_init(init_udf_fs)
238 module_exit(exit_udf_fs)
239
240 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
241 {
242 struct udf_sb_info *sbi = UDF_SB(sb);
243
244 sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
245 GFP_KERNEL);
246 if (!sbi->s_partmaps) {
247 udf_error(sb, __FUNCTION__,
248 "Unable to allocate space for %d partition maps",
249 count);
250 sbi->s_partitions = 0;
251 return -ENOMEM;
252 }
253
254 sbi->s_partitions = count;
255 return 0;
256 }
257
258 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
259 {
260 struct super_block *sb = mnt->mnt_sb;
261 struct udf_sb_info *sbi = UDF_SB(sb);
262
263 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
264 seq_puts(seq, ",nostrict");
265 if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
266 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
267 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
268 seq_puts(seq, ",unhide");
269 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
270 seq_puts(seq, ",undelete");
271 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
272 seq_puts(seq, ",noadinicb");
273 if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
274 seq_puts(seq, ",shortad");
275 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
276 seq_puts(seq, ",uid=forget");
277 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
278 seq_puts(seq, ",uid=ignore");
279 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
280 seq_puts(seq, ",gid=forget");
281 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
282 seq_puts(seq, ",gid=ignore");
283 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
284 seq_printf(seq, ",uid=%u", sbi->s_uid);
285 if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
286 seq_printf(seq, ",gid=%u", sbi->s_gid);
287 if (sbi->s_umask != 0)
288 seq_printf(seq, ",umask=%o", sbi->s_umask);
289 if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
290 seq_printf(seq, ",session=%u", sbi->s_session);
291 if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
292 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
293 /*
294 * s_anchor[2] could be zeroed out in case there is no anchor
295 * in the specified block, but then the "anchor=N" option
296 * originally given by the user wasn't effective, so it's OK
297 * if we don't show it.
298 */
299 if (sbi->s_anchor[2] != 0)
300 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
301 /*
302 * volume, partition, fileset and rootdir seem to be ignored
303 * currently
304 */
305 if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
306 seq_puts(seq, ",utf8");
307 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
308 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
309
310 return 0;
311 }
312
313 /*
314 * udf_parse_options
315 *
316 * PURPOSE
317 * Parse mount options.
318 *
319 * DESCRIPTION
320 * The following mount options are supported:
321 *
322 * gid= Set the default group.
323 * umask= Set the default umask.
324 * uid= Set the default user.
325 * bs= Set the block size.
326 * unhide Show otherwise hidden files.
327 * undelete Show deleted files in lists.
328 * adinicb Embed data in the inode (default)
329 * noadinicb Don't embed data in the inode
330 * shortad Use short ad's
331 * longad Use long ad's (default)
332 * nostrict Unset strict conformance
333 * iocharset= Set the NLS character set
334 *
335 * The remaining are for debugging and disaster recovery:
336 *
337 * novrs Skip volume sequence recognition
338 *
339 * The following expect a offset from 0.
340 *
341 * session= Set the CDROM session (default= last session)
342 * anchor= Override standard anchor location. (default= 256)
343 * volume= Override the VolumeDesc location. (unused)
344 * partition= Override the PartitionDesc location. (unused)
345 * lastblock= Set the last block of the filesystem/
346 *
347 * The following expect a offset from the partition root.
348 *
349 * fileset= Override the fileset block location. (unused)
350 * rootdir= Override the root directory location. (unused)
351 * WARNING: overriding the rootdir to a non-directory may
352 * yield highly unpredictable results.
353 *
354 * PRE-CONDITIONS
355 * options Pointer to mount options string.
356 * uopts Pointer to mount options variable.
357 *
358 * POST-CONDITIONS
359 * <return> 1 Mount options parsed okay.
360 * <return> 0 Error parsing mount options.
361 *
362 * HISTORY
363 * July 1, 1997 - Andrew E. Mileski
364 * Written, tested, and released.
365 */
366
367 enum {
368 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
369 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
370 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
371 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
372 Opt_rootdir, Opt_utf8, Opt_iocharset,
373 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
374 };
375
376 static match_table_t tokens = {
377 {Opt_novrs, "novrs"},
378 {Opt_nostrict, "nostrict"},
379 {Opt_bs, "bs=%u"},
380 {Opt_unhide, "unhide"},
381 {Opt_undelete, "undelete"},
382 {Opt_noadinicb, "noadinicb"},
383 {Opt_adinicb, "adinicb"},
384 {Opt_shortad, "shortad"},
385 {Opt_longad, "longad"},
386 {Opt_uforget, "uid=forget"},
387 {Opt_uignore, "uid=ignore"},
388 {Opt_gforget, "gid=forget"},
389 {Opt_gignore, "gid=ignore"},
390 {Opt_gid, "gid=%u"},
391 {Opt_uid, "uid=%u"},
392 {Opt_umask, "umask=%o"},
393 {Opt_session, "session=%u"},
394 {Opt_lastblock, "lastblock=%u"},
395 {Opt_anchor, "anchor=%u"},
396 {Opt_volume, "volume=%u"},
397 {Opt_partition, "partition=%u"},
398 {Opt_fileset, "fileset=%u"},
399 {Opt_rootdir, "rootdir=%u"},
400 {Opt_utf8, "utf8"},
401 {Opt_iocharset, "iocharset=%s"},
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->blocksize = UDF_DEFAULT_BLOCKSIZE;
413 uopt->partition = 0xFFFF;
414 uopt->session = 0xFFFFFFFF;
415 uopt->lastblock = 0;
416 uopt->anchor = 0;
417 uopt->volume = 0xFFFFFFFF;
418 uopt->rootdir = 0xFFFFFFFF;
419 uopt->fileset = 0xFFFFFFFF;
420 uopt->nls_map = NULL;
421
422 if (!options)
423 return 1;
424
425 while ((p = strsep(&options, ",")) != NULL) {
426 substring_t args[MAX_OPT_ARGS];
427 int token;
428 if (!*p)
429 continue;
430
431 token = match_token(p, tokens, args);
432 switch (token) {
433 case Opt_novrs:
434 uopt->novrs = 1;
435 case Opt_bs:
436 if (match_int(&args[0], &option))
437 return 0;
438 uopt->blocksize = option;
439 break;
440 case Opt_unhide:
441 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
442 break;
443 case Opt_undelete:
444 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
445 break;
446 case Opt_noadinicb:
447 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
448 break;
449 case Opt_adinicb:
450 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
451 break;
452 case Opt_shortad:
453 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
454 break;
455 case Opt_longad:
456 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
457 break;
458 case Opt_gid:
459 if (match_int(args, &option))
460 return 0;
461 uopt->gid = option;
462 uopt->flags |= (1 << UDF_FLAG_GID_SET);
463 break;
464 case Opt_uid:
465 if (match_int(args, &option))
466 return 0;
467 uopt->uid = option;
468 uopt->flags |= (1 << UDF_FLAG_UID_SET);
469 break;
470 case Opt_umask:
471 if (match_octal(args, &option))
472 return 0;
473 uopt->umask = option;
474 break;
475 case Opt_nostrict:
476 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
477 break;
478 case Opt_session:
479 if (match_int(args, &option))
480 return 0;
481 uopt->session = option;
482 if (!remount)
483 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
484 break;
485 case Opt_lastblock:
486 if (match_int(args, &option))
487 return 0;
488 uopt->lastblock = option;
489 if (!remount)
490 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
491 break;
492 case Opt_anchor:
493 if (match_int(args, &option))
494 return 0;
495 uopt->anchor = option;
496 break;
497 case Opt_volume:
498 if (match_int(args, &option))
499 return 0;
500 uopt->volume = option;
501 break;
502 case Opt_partition:
503 if (match_int(args, &option))
504 return 0;
505 uopt->partition = option;
506 break;
507 case Opt_fileset:
508 if (match_int(args, &option))
509 return 0;
510 uopt->fileset = option;
511 break;
512 case Opt_rootdir:
513 if (match_int(args, &option))
514 return 0;
515 uopt->rootdir = option;
516 break;
517 case Opt_utf8:
518 uopt->flags |= (1 << UDF_FLAG_UTF8);
519 break;
520 #ifdef CONFIG_UDF_NLS
521 case Opt_iocharset:
522 uopt->nls_map = load_nls(args[0].from);
523 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
524 break;
525 #endif
526 case Opt_uignore:
527 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
528 break;
529 case Opt_uforget:
530 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
531 break;
532 case Opt_gignore:
533 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
534 break;
535 case Opt_gforget:
536 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
537 break;
538 default:
539 printk(KERN_ERR "udf: bad mount option \"%s\" "
540 "or missing value\n", p);
541 return 0;
542 }
543 }
544 return 1;
545 }
546
547 static void udf_write_super(struct super_block *sb)
548 {
549 lock_kernel();
550
551 if (!(sb->s_flags & MS_RDONLY))
552 udf_open_lvid(sb);
553 sb->s_dirt = 0;
554
555 unlock_kernel();
556 }
557
558 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
559 {
560 struct udf_options uopt;
561 struct udf_sb_info *sbi = UDF_SB(sb);
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
568 if (!udf_parse_options(options, &uopt, true))
569 return -EINVAL;
570
571 sbi->s_flags = uopt.flags;
572 sbi->s_uid = uopt.uid;
573 sbi->s_gid = uopt.gid;
574 sbi->s_umask = uopt.umask;
575
576 if (sbi->s_lvid_bh) {
577 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
578 if (write_rev > UDF_MAX_WRITE_VERSION)
579 *flags |= MS_RDONLY;
580 }
581
582 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
583 return 0;
584 if (*flags & MS_RDONLY)
585 udf_close_lvid(sb);
586 else
587 udf_open_lvid(sb);
588
589 return 0;
590 }
591
592 static int udf_vrs(struct super_block *sb, int silent)
593 {
594 struct volStructDesc *vsd = NULL;
595 int sector = 32768;
596 int sectorsize;
597 struct buffer_head *bh = NULL;
598 int iso9660 = 0;
599 int nsr02 = 0;
600 int nsr03 = 0;
601 struct udf_sb_info *sbi;
602
603 /* Block size must be a multiple of 512 */
604 if (sb->s_blocksize & 511)
605 return 0;
606 sbi = UDF_SB(sb);
607
608 if (sb->s_blocksize < sizeof(struct volStructDesc))
609 sectorsize = sizeof(struct volStructDesc);
610 else
611 sectorsize = sb->s_blocksize;
612
613 sector += (sbi->s_session << sb->s_blocksize_bits);
614
615 udf_debug("Starting at sector %u (%ld byte sectors)\n",
616 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
617 /* Process the sequence (if applicable) */
618 for (; !nsr02 && !nsr03; sector += sectorsize) {
619 /* Read a block */
620 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
621 if (!bh)
622 break;
623
624 /* Look for ISO descriptors */
625 vsd = (struct volStructDesc *)(bh->b_data +
626 (sector & (sb->s_blocksize - 1)));
627
628 if (vsd->stdIdent[0] == 0) {
629 brelse(bh);
630 break;
631 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
632 VSD_STD_ID_LEN)) {
633 iso9660 = sector;
634 switch (vsd->structType) {
635 case 0:
636 udf_debug("ISO9660 Boot Record found\n");
637 break;
638 case 1:
639 udf_debug("ISO9660 Primary Volume Descriptor "
640 "found\n");
641 break;
642 case 2:
643 udf_debug("ISO9660 Supplementary Volume "
644 "Descriptor found\n");
645 break;
646 case 3:
647 udf_debug("ISO9660 Volume Partition Descriptor "
648 "found\n");
649 break;
650 case 255:
651 udf_debug("ISO9660 Volume Descriptor Set "
652 "Terminator found\n");
653 break;
654 default:
655 udf_debug("ISO9660 VRS (%u) found\n",
656 vsd->structType);
657 break;
658 }
659 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
660 VSD_STD_ID_LEN))
661 ; /* nothing */
662 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
663 VSD_STD_ID_LEN)) {
664 brelse(bh);
665 break;
666 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
667 VSD_STD_ID_LEN))
668 nsr02 = sector;
669 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
670 VSD_STD_ID_LEN))
671 nsr03 = sector;
672 brelse(bh);
673 }
674
675 if (nsr03)
676 return nsr03;
677 else if (nsr02)
678 return nsr02;
679 else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
680 return -1;
681 else
682 return 0;
683 }
684
685 /*
686 * udf_find_anchor
687 *
688 * PURPOSE
689 * Find an anchor volume descriptor.
690 *
691 * PRE-CONDITIONS
692 * sb Pointer to _locked_ superblock.
693 * lastblock Last block on media.
694 *
695 * POST-CONDITIONS
696 * <return> 1 if not found, 0 if ok
697 *
698 * HISTORY
699 * July 1, 1997 - Andrew E. Mileski
700 * Written, tested, and released.
701 */
702 static void udf_find_anchor(struct super_block *sb)
703 {
704 int lastblock;
705 struct buffer_head *bh = NULL;
706 uint16_t ident;
707 uint32_t location;
708 int i;
709 struct udf_sb_info *sbi;
710
711 sbi = UDF_SB(sb);
712 lastblock = sbi->s_last_block;
713
714 if (lastblock) {
715 int varlastblock = udf_variable_to_fixed(lastblock);
716 int last[] = { lastblock, lastblock - 2,
717 lastblock - 150, lastblock - 152,
718 varlastblock, varlastblock - 2,
719 varlastblock - 150, varlastblock - 152 };
720
721 lastblock = 0;
722
723 /* Search for an anchor volume descriptor pointer */
724
725 /* according to spec, anchor is in either:
726 * block 256
727 * lastblock-256
728 * lastblock
729 * however, if the disc isn't closed, it could be 512 */
730
731 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
732 ident = location = 0;
733 if (last[i] >= 0) {
734 bh = sb_bread(sb, last[i]);
735 if (bh) {
736 tag *t = (tag *)bh->b_data;
737 ident = le16_to_cpu(t->tagIdent);
738 location = le32_to_cpu(t->tagLocation);
739 brelse(bh);
740 }
741 }
742
743 if (ident == TAG_IDENT_AVDP) {
744 if (location == last[i] - sbi->s_session) {
745 lastblock = last[i] - sbi->s_session;
746 sbi->s_anchor[0] = lastblock;
747 sbi->s_anchor[1] = lastblock - 256;
748 } else if (location ==
749 udf_variable_to_fixed(last[i]) -
750 sbi->s_session) {
751 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
752 lastblock =
753 udf_variable_to_fixed(last[i]) -
754 sbi->s_session;
755 sbi->s_anchor[0] = lastblock;
756 sbi->s_anchor[1] = lastblock - 256 -
757 sbi->s_session;
758 } else {
759 udf_debug("Anchor found at block %d, "
760 "location mismatch %d.\n",
761 last[i], location);
762 }
763 } else if (ident == TAG_IDENT_FE ||
764 ident == TAG_IDENT_EFE) {
765 lastblock = last[i];
766 sbi->s_anchor[3] = 512;
767 } else {
768 ident = location = 0;
769 if (last[i] >= 256) {
770 bh = sb_bread(sb, last[i] - 256);
771 if (bh) {
772 tag *t = (tag *)bh->b_data;
773 ident = le16_to_cpu(
774 t->tagIdent);
775 location = le32_to_cpu(
776 t->tagLocation);
777 brelse(bh);
778 }
779 }
780
781 if (ident == TAG_IDENT_AVDP &&
782 location == last[i] - 256 -
783 sbi->s_session) {
784 lastblock = last[i];
785 sbi->s_anchor[1] = last[i] - 256;
786 } else {
787 ident = location = 0;
788 if (last[i] >= 312 + sbi->s_session) {
789 bh = sb_bread(sb,
790 last[i] - 312 -
791 sbi->s_session);
792 if (bh) {
793 tag *t = (tag *)
794 bh->b_data;
795 ident = le16_to_cpu(
796 t->tagIdent);
797 location = le32_to_cpu(
798 t->tagLocation);
799 brelse(bh);
800 }
801 }
802
803 if (ident == TAG_IDENT_AVDP &&
804 location == udf_variable_to_fixed(last[i]) - 256) {
805 UDF_SET_FLAG(sb,
806 UDF_FLAG_VARCONV);
807 lastblock = udf_variable_to_fixed(last[i]);
808 sbi->s_anchor[1] = lastblock - 256;
809 }
810 }
811 }
812 }
813 }
814
815 if (!lastblock) {
816 /* We haven't found the lastblock. check 312 */
817 bh = sb_bread(sb, 312 + sbi->s_session);
818 if (bh) {
819 tag *t = (tag *)bh->b_data;
820 ident = le16_to_cpu(t->tagIdent);
821 location = le32_to_cpu(t->tagLocation);
822 brelse(bh);
823
824 if (ident == TAG_IDENT_AVDP && location == 256)
825 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
826 }
827 }
828
829 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
830 if (!sbi->s_anchor[i])
831 continue;
832 bh = udf_read_tagged(sb, sbi->s_anchor[i],
833 sbi->s_anchor[i], &ident);
834 if (!bh)
835 sbi->s_anchor[i] = 0;
836 else {
837 brelse(bh);
838 if ((ident != TAG_IDENT_AVDP) &&
839 (i || (ident != TAG_IDENT_FE &&
840 ident != TAG_IDENT_EFE)))
841 sbi->s_anchor[i] = 0;
842 }
843 }
844
845 sbi->s_last_block = lastblock;
846 }
847
848 static int udf_find_fileset(struct super_block *sb,
849 kernel_lb_addr *fileset,
850 kernel_lb_addr *root)
851 {
852 struct buffer_head *bh = NULL;
853 long lastblock;
854 uint16_t ident;
855 struct udf_sb_info *sbi;
856
857 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
858 fileset->partitionReferenceNum != 0xFFFF) {
859 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
860
861 if (!bh) {
862 return 1;
863 } else if (ident != TAG_IDENT_FSD) {
864 brelse(bh);
865 return 1;
866 }
867
868 }
869
870 sbi = UDF_SB(sb);
871 if (!bh) {
872 /* Search backwards through the partitions */
873 kernel_lb_addr newfileset;
874
875 /* --> cvg: FIXME - is it reasonable? */
876 return 1;
877
878 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
879 (newfileset.partitionReferenceNum != 0xFFFF &&
880 fileset->logicalBlockNum == 0xFFFFFFFF &&
881 fileset->partitionReferenceNum == 0xFFFF);
882 newfileset.partitionReferenceNum--) {
883 lastblock = sbi->s_partmaps
884 [newfileset.partitionReferenceNum]
885 .s_partition_len;
886 newfileset.logicalBlockNum = 0;
887
888 do {
889 bh = udf_read_ptagged(sb, newfileset, 0,
890 &ident);
891 if (!bh) {
892 newfileset.logicalBlockNum++;
893 continue;
894 }
895
896 switch (ident) {
897 case TAG_IDENT_SBD:
898 {
899 struct spaceBitmapDesc *sp;
900 sp = (struct spaceBitmapDesc *)
901 bh->b_data;
902 newfileset.logicalBlockNum += 1 +
903 ((le32_to_cpu(sp->numOfBytes) +
904 sizeof(struct spaceBitmapDesc)
905 - 1) >> sb->s_blocksize_bits);
906 brelse(bh);
907 break;
908 }
909 case TAG_IDENT_FSD:
910 *fileset = newfileset;
911 break;
912 default:
913 newfileset.logicalBlockNum++;
914 brelse(bh);
915 bh = NULL;
916 break;
917 }
918 } while (newfileset.logicalBlockNum < lastblock &&
919 fileset->logicalBlockNum == 0xFFFFFFFF &&
920 fileset->partitionReferenceNum == 0xFFFF);
921 }
922 }
923
924 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
925 fileset->partitionReferenceNum != 0xFFFF) && bh) {
926 udf_debug("Fileset at block=%d, partition=%d\n",
927 fileset->logicalBlockNum,
928 fileset->partitionReferenceNum);
929
930 sbi->s_partition = fileset->partitionReferenceNum;
931 udf_load_fileset(sb, bh, root);
932 brelse(bh);
933 return 0;
934 }
935 return 1;
936 }
937
938 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
939 {
940 struct primaryVolDesc *pvoldesc;
941 struct ustr instr;
942 struct ustr outstr;
943
944 pvoldesc = (struct primaryVolDesc *)bh->b_data;
945
946 if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
947 pvoldesc->recordingDateAndTime)) {
948 #ifdef UDFFS_DEBUG
949 timestamp *ts = &pvoldesc->recordingDateAndTime;
950 udf_debug("recording time %04u/%02u/%02u"
951 " %02u:%02u (%x)\n",
952 le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
953 ts->minute, le16_to_cpu(ts->typeAndTimezone));
954 #endif
955 }
956
957 if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
958 if (udf_CS0toUTF8(&outstr, &instr)) {
959 strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
960 outstr.u_len > 31 ? 31 : outstr.u_len);
961 udf_debug("volIdent[] = '%s'\n",
962 UDF_SB(sb)->s_volume_ident);
963 }
964
965 if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
966 if (udf_CS0toUTF8(&outstr, &instr))
967 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
968 }
969
970 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
971 kernel_lb_addr *root)
972 {
973 struct fileSetDesc *fset;
974
975 fset = (struct fileSetDesc *)bh->b_data;
976
977 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
978
979 UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
980
981 udf_debug("Rootdir at block=%d, partition=%d\n",
982 root->logicalBlockNum, root->partitionReferenceNum);
983 }
984
985 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
986 {
987 struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
988 return DIV_ROUND_UP(map->s_partition_len +
989 (sizeof(struct spaceBitmapDesc) << 3),
990 sb->s_blocksize * 8);
991 }
992
993 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
994 {
995 struct udf_bitmap *bitmap;
996 int nr_groups;
997 int size;
998
999 nr_groups = udf_compute_nr_groups(sb, index);
1000 size = sizeof(struct udf_bitmap) +
1001 (sizeof(struct buffer_head *) * nr_groups);
1002
1003 if (size <= PAGE_SIZE)
1004 bitmap = kmalloc(size, GFP_KERNEL);
1005 else
1006 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1007
1008 if (bitmap == NULL) {
1009 udf_error(sb, __FUNCTION__,
1010 "Unable to allocate space for bitmap "
1011 "and %d buffer_head pointers", nr_groups);
1012 return NULL;
1013 }
1014
1015 memset(bitmap, 0x00, size);
1016 bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1017 bitmap->s_nr_groups = nr_groups;
1018 return bitmap;
1019 }
1020
1021 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
1022 {
1023 struct partitionHeaderDesc *phd;
1024 struct partitionDesc *p = (struct partitionDesc *)bh->b_data;
1025 struct udf_part_map *map;
1026 struct udf_sb_info *sbi = UDF_SB(sb);
1027 bool found = false;
1028 int i;
1029 u16 partitionNumber = le16_to_cpu(p->partitionNumber);
1030
1031 for (i = 0; i < sbi->s_partitions; i++) {
1032 map = &sbi->s_partmaps[i];
1033 udf_debug("Searching map: (%d == %d)\n",
1034 map->s_partition_num, partitionNumber);
1035 found = map->s_partition_num == partitionNumber;
1036 if (found)
1037 break;
1038 }
1039
1040 if (!found) {
1041 udf_debug("Partition (%d) not found in partition map\n",
1042 partitionNumber);
1043 return 0;
1044 }
1045
1046 map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1047 map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1048
1049 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1050 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1051 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1052 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1053 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1054 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1055 if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1056 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1057
1058 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1059 "block length %d\n", partitionNumber, i,
1060 map->s_partition_type, map->s_partition_root,
1061 map->s_partition_len);
1062
1063 if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1064 strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1065 return 0;
1066
1067 phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1068 if (phd->unallocSpaceTable.extLength) {
1069 kernel_lb_addr loc = {
1070 .logicalBlockNum = le32_to_cpu(
1071 phd->unallocSpaceTable.extPosition),
1072 .partitionReferenceNum = i,
1073 };
1074
1075 map->s_uspace.s_table = udf_iget(sb, loc);
1076 if (!map->s_uspace.s_table) {
1077 udf_debug("cannot load unallocSpaceTable (part %d)\n",
1078 i);
1079 return 1;
1080 }
1081 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1082 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1083 i, map->s_uspace.s_table->i_ino);
1084 }
1085
1086 if (phd->unallocSpaceBitmap.extLength) {
1087 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, i);
1088 map->s_uspace.s_bitmap = bitmap;
1089 if (bitmap != NULL) {
1090 bitmap->s_extLength = le32_to_cpu(
1091 phd->unallocSpaceBitmap.extLength);
1092 bitmap->s_extPosition = le32_to_cpu(
1093 phd->unallocSpaceBitmap.extPosition);
1094 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1095 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1096 i, bitmap->s_extPosition);
1097 }
1098 }
1099
1100 if (phd->partitionIntegrityTable.extLength)
1101 udf_debug("partitionIntegrityTable (part %d)\n", i);
1102
1103 if (phd->freedSpaceTable.extLength) {
1104 kernel_lb_addr loc = {
1105 .logicalBlockNum = le32_to_cpu(
1106 phd->freedSpaceTable.extPosition),
1107 .partitionReferenceNum = i,
1108 };
1109
1110 map->s_fspace.s_table = udf_iget(sb, loc);
1111 if (!map->s_fspace.s_table) {
1112 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1113 return 1;
1114 }
1115
1116 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1117 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1118 i, map->s_fspace.s_table->i_ino);
1119 }
1120
1121 if (phd->freedSpaceBitmap.extLength) {
1122 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, i);
1123 map->s_fspace.s_bitmap = bitmap;
1124 if (bitmap != NULL) {
1125 bitmap->s_extLength = le32_to_cpu(
1126 phd->freedSpaceBitmap.extLength);
1127 bitmap->s_extPosition = le32_to_cpu(
1128 phd->freedSpaceBitmap.extPosition);
1129 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1130 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1131 i, bitmap->s_extPosition);
1132 }
1133 }
1134
1135 return 0;
1136 }
1137
1138 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1139 kernel_lb_addr *fileset)
1140 {
1141 struct logicalVolDesc *lvd;
1142 int i, j, offset;
1143 uint8_t type;
1144 struct udf_sb_info *sbi = UDF_SB(sb);
1145 struct genericPartitionMap *gpm;
1146
1147 lvd = (struct logicalVolDesc *)bh->b_data;
1148
1149 i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1150 if (i != 0)
1151 return i;
1152
1153 for (i = 0, offset = 0;
1154 i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1155 i++, offset += gpm->partitionMapLength) {
1156 struct udf_part_map *map = &sbi->s_partmaps[i];
1157 gpm = (struct genericPartitionMap *)
1158 &(lvd->partitionMaps[offset]);
1159 type = gpm->partitionMapType;
1160 if (type == 1) {
1161 struct genericPartitionMap1 *gpm1 =
1162 (struct genericPartitionMap1 *)gpm;
1163 map->s_partition_type = UDF_TYPE1_MAP15;
1164 map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1165 map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1166 map->s_partition_func = NULL;
1167 } else if (type == 2) {
1168 struct udfPartitionMap2 *upm2 =
1169 (struct udfPartitionMap2 *)gpm;
1170 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1171 strlen(UDF_ID_VIRTUAL))) {
1172 u16 suf =
1173 le16_to_cpu(((__le16 *)upm2->partIdent.
1174 identSuffix)[0]);
1175 if (suf == 0x0150) {
1176 map->s_partition_type =
1177 UDF_VIRTUAL_MAP15;
1178 map->s_partition_func =
1179 udf_get_pblock_virt15;
1180 } else if (suf == 0x0200) {
1181 map->s_partition_type =
1182 UDF_VIRTUAL_MAP20;
1183 map->s_partition_func =
1184 udf_get_pblock_virt20;
1185 }
1186 } else if (!strncmp(upm2->partIdent.ident,
1187 UDF_ID_SPARABLE,
1188 strlen(UDF_ID_SPARABLE))) {
1189 uint32_t loc;
1190 uint16_t ident;
1191 struct sparingTable *st;
1192 struct sparablePartitionMap *spm =
1193 (struct sparablePartitionMap *)gpm;
1194
1195 map->s_partition_type = UDF_SPARABLE_MAP15;
1196 map->s_type_specific.s_sparing.s_packet_len =
1197 le16_to_cpu(spm->packetLength);
1198 for (j = 0; j < spm->numSparingTables; j++) {
1199 struct buffer_head *bh2;
1200
1201 loc = le32_to_cpu(
1202 spm->locSparingTable[j]);
1203 bh2 = udf_read_tagged(sb, loc, loc,
1204 &ident);
1205 map->s_type_specific.s_sparing.
1206 s_spar_map[j] = bh2;
1207
1208 if (bh2 == NULL)
1209 continue;
1210
1211 st = (struct sparingTable *)bh2->b_data;
1212 if (ident != 0 || strncmp(
1213 st->sparingIdent.ident,
1214 UDF_ID_SPARING,
1215 strlen(UDF_ID_SPARING))) {
1216 brelse(bh2);
1217 map->s_type_specific.s_sparing.
1218 s_spar_map[j] = NULL;
1219 }
1220 }
1221 map->s_partition_func = udf_get_pblock_spar15;
1222 } else {
1223 udf_debug("Unknown ident: %s\n",
1224 upm2->partIdent.ident);
1225 continue;
1226 }
1227 map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1228 map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1229 }
1230 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1231 i, map->s_partition_num, type,
1232 map->s_volumeseqnum);
1233 }
1234
1235 if (fileset) {
1236 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1237
1238 *fileset = lelb_to_cpu(la->extLocation);
1239 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1240 "partition=%d\n", fileset->logicalBlockNum,
1241 fileset->partitionReferenceNum);
1242 }
1243 if (lvd->integritySeqExt.extLength)
1244 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1245
1246 return 0;
1247 }
1248
1249 /*
1250 * udf_load_logicalvolint
1251 *
1252 */
1253 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1254 {
1255 struct buffer_head *bh = NULL;
1256 uint16_t ident;
1257 struct udf_sb_info *sbi = UDF_SB(sb);
1258 struct logicalVolIntegrityDesc *lvid;
1259
1260 while (loc.extLength > 0 &&
1261 (bh = udf_read_tagged(sb, loc.extLocation,
1262 loc.extLocation, &ident)) &&
1263 ident == TAG_IDENT_LVID) {
1264 sbi->s_lvid_bh = bh;
1265 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1266
1267 if (lvid->nextIntegrityExt.extLength)
1268 udf_load_logicalvolint(sb,
1269 leea_to_cpu(lvid->nextIntegrityExt));
1270
1271 if (sbi->s_lvid_bh != bh)
1272 brelse(bh);
1273 loc.extLength -= sb->s_blocksize;
1274 loc.extLocation++;
1275 }
1276 if (sbi->s_lvid_bh != bh)
1277 brelse(bh);
1278 }
1279
1280 /*
1281 * udf_process_sequence
1282 *
1283 * PURPOSE
1284 * Process a main/reserve volume descriptor sequence.
1285 *
1286 * PRE-CONDITIONS
1287 * sb Pointer to _locked_ superblock.
1288 * block First block of first extent of the sequence.
1289 * lastblock Lastblock of first extent of the sequence.
1290 *
1291 * HISTORY
1292 * July 1, 1997 - Andrew E. Mileski
1293 * Written, tested, and released.
1294 */
1295 static noinline int udf_process_sequence(struct super_block *sb, long block,
1296 long lastblock, kernel_lb_addr *fileset)
1297 {
1298 struct buffer_head *bh = NULL;
1299 struct udf_vds_record vds[VDS_POS_LENGTH];
1300 struct udf_vds_record *curr;
1301 struct generic_desc *gd;
1302 struct volDescPtr *vdp;
1303 int done = 0;
1304 int i, j;
1305 uint32_t vdsn;
1306 uint16_t ident;
1307 long next_s = 0, next_e = 0;
1308
1309 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1310
1311 /* Read the main descriptor sequence */
1312 for (; (!done && block <= lastblock); block++) {
1313
1314 bh = udf_read_tagged(sb, block, block, &ident);
1315 if (!bh)
1316 break;
1317
1318 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1319 gd = (struct generic_desc *)bh->b_data;
1320 vdsn = le32_to_cpu(gd->volDescSeqNum);
1321 switch (ident) {
1322 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1323 curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1324 if (vdsn >= curr->volDescSeqNum) {
1325 curr->volDescSeqNum = vdsn;
1326 curr->block = block;
1327 }
1328 break;
1329 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1330 curr = &vds[VDS_POS_VOL_DESC_PTR];
1331 if (vdsn >= curr->volDescSeqNum) {
1332 curr->volDescSeqNum = vdsn;
1333 curr->block = block;
1334
1335 vdp = (struct volDescPtr *)bh->b_data;
1336 next_s = le32_to_cpu(
1337 vdp->nextVolDescSeqExt.extLocation);
1338 next_e = le32_to_cpu(
1339 vdp->nextVolDescSeqExt.extLength);
1340 next_e = next_e >> sb->s_blocksize_bits;
1341 next_e += next_s;
1342 }
1343 break;
1344 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1345 curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1346 if (vdsn >= curr->volDescSeqNum) {
1347 curr->volDescSeqNum = vdsn;
1348 curr->block = block;
1349 }
1350 break;
1351 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1352 curr = &vds[VDS_POS_PARTITION_DESC];
1353 if (!curr->block)
1354 curr->block = block;
1355 break;
1356 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1357 curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1358 if (vdsn >= curr->volDescSeqNum) {
1359 curr->volDescSeqNum = vdsn;
1360 curr->block = block;
1361 }
1362 break;
1363 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1364 curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1365 if (vdsn >= curr->volDescSeqNum) {
1366 curr->volDescSeqNum = vdsn;
1367 curr->block = block;
1368 }
1369 break;
1370 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1371 vds[VDS_POS_TERMINATING_DESC].block = block;
1372 if (next_e) {
1373 block = next_s;
1374 lastblock = next_e;
1375 next_s = next_e = 0;
1376 } else
1377 done = 1;
1378 break;
1379 }
1380 brelse(bh);
1381 }
1382 for (i = 0; i < VDS_POS_LENGTH; i++) {
1383 if (!vds[i].block)
1384 continue;
1385
1386 bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1387 &ident);
1388
1389 if (i == VDS_POS_PRIMARY_VOL_DESC)
1390 udf_load_pvoldesc(sb, bh);
1391 else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1392 if (udf_load_logicalvol(sb, bh, fileset)) {
1393 brelse(bh);
1394 return 1;
1395 }
1396 } else if (i == VDS_POS_PARTITION_DESC) {
1397 struct buffer_head *bh2 = NULL;
1398 if (udf_load_partdesc(sb, bh)) {
1399 brelse(bh);
1400 return 1;
1401 }
1402 for (j = vds[i].block + 1;
1403 j < vds[VDS_POS_TERMINATING_DESC].block;
1404 j++) {
1405 bh2 = udf_read_tagged(sb, j, j, &ident);
1406 gd = (struct generic_desc *)bh2->b_data;
1407 if (ident == TAG_IDENT_PD)
1408 if (udf_load_partdesc(sb, bh2)) {
1409 brelse(bh);
1410 brelse(bh2);
1411 return 1;
1412 }
1413 brelse(bh2);
1414 }
1415 }
1416 brelse(bh);
1417 }
1418
1419 return 0;
1420 }
1421
1422 /*
1423 * udf_check_valid()
1424 */
1425 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1426 {
1427 long block;
1428 struct udf_sb_info *sbi;
1429
1430 if (novrs) {
1431 udf_debug("Validity check skipped because of novrs option\n");
1432 return 0;
1433 }
1434 /* Check that it is NSR02 compliant */
1435 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1436 block = udf_vrs(sb, silent);
1437 if (block != -1)
1438 return !block;
1439
1440 sbi = UDF_SB(sb);
1441 udf_debug("Failed to read byte 32768. Assuming open "
1442 "disc. Skipping validity check\n");
1443 if (!sbi->s_last_block)
1444 sbi->s_last_block = udf_get_last_block(sb);
1445 return 0;
1446 }
1447
1448 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1449 {
1450 struct anchorVolDescPtr *anchor;
1451 uint16_t ident;
1452 struct buffer_head *bh;
1453 long main_s, main_e, reserve_s, reserve_e;
1454 int i, j;
1455 struct udf_sb_info *sbi;
1456
1457 if (!sb)
1458 return 1;
1459 sbi = UDF_SB(sb);
1460
1461 for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1462 if (!sbi->s_anchor[i])
1463 continue;
1464
1465 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1466 &ident);
1467 if (!bh)
1468 continue;
1469
1470 anchor = (struct anchorVolDescPtr *)bh->b_data;
1471
1472 /* Locate the main sequence */
1473 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1474 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1475 main_e = main_e >> sb->s_blocksize_bits;
1476 main_e += main_s;
1477
1478 /* Locate the reserve sequence */
1479 reserve_s = le32_to_cpu(
1480 anchor->reserveVolDescSeqExt.extLocation);
1481 reserve_e = le32_to_cpu(
1482 anchor->reserveVolDescSeqExt.extLength);
1483 reserve_e = reserve_e >> sb->s_blocksize_bits;
1484 reserve_e += reserve_s;
1485
1486 brelse(bh);
1487
1488 /* Process the main & reserve sequences */
1489 /* responsible for finding the PartitionDesc(s) */
1490 if (!(udf_process_sequence(sb, main_s, main_e,
1491 fileset) &&
1492 udf_process_sequence(sb, reserve_s, reserve_e,
1493 fileset)))
1494 break;
1495 }
1496
1497 if (i == ARRAY_SIZE(sbi->s_anchor)) {
1498 udf_debug("No Anchor block found\n");
1499 return 1;
1500 }
1501 udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1502
1503 for (i = 0; i < sbi->s_partitions; i++) {
1504 kernel_lb_addr uninitialized_var(ino);
1505 struct udf_part_map *map = &sbi->s_partmaps[i];
1506
1507 if (map->s_partition_type != UDF_VIRTUAL_MAP15 &&
1508 map->s_partition_type != UDF_VIRTUAL_MAP20)
1509 continue;
1510
1511 if (!sbi->s_last_block) {
1512 sbi->s_last_block = udf_get_last_block(sb);
1513 udf_find_anchor(sb);
1514 }
1515
1516 if (!sbi->s_last_block) {
1517 udf_debug("Unable to determine Lastblock (For "
1518 "Virtual Partition)\n");
1519 return 1;
1520 }
1521
1522 for (j = 0; j < sbi->s_partitions; j++) {
1523 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1524 if (j != i &&
1525 map->s_volumeseqnum ==
1526 map2->s_volumeseqnum &&
1527 map->s_partition_num ==
1528 map2->s_partition_num) {
1529 ino.partitionReferenceNum = j;
1530 ino.logicalBlockNum =
1531 sbi->s_last_block -
1532 map2->s_partition_root;
1533 break;
1534 }
1535 }
1536
1537 if (j == sbi->s_partitions)
1538 return 1;
1539
1540 sbi->s_vat_inode = udf_iget(sb, ino);
1541 if (!sbi->s_vat_inode)
1542 return 1;
1543
1544 if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1545 map->s_type_specific.s_virtual.s_start_offset =
1546 udf_ext0_offset(sbi->s_vat_inode);
1547 map->s_type_specific.s_virtual.s_num_entries =
1548 (sbi->s_vat_inode->i_size - 36) >> 2;
1549 } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1550 uint32_t pos;
1551 struct virtualAllocationTable20 *vat20;
1552
1553 pos = udf_block_map(sbi->s_vat_inode, 0);
1554 bh = sb_bread(sb, pos);
1555 if (!bh)
1556 return 1;
1557 vat20 = (struct virtualAllocationTable20 *)
1558 bh->b_data +
1559 udf_ext0_offset(sbi->s_vat_inode);
1560 map->s_type_specific.s_virtual.s_start_offset =
1561 le16_to_cpu(vat20->lengthHeader) +
1562 udf_ext0_offset(sbi->s_vat_inode);
1563 map->s_type_specific.s_virtual.s_num_entries =
1564 (sbi->s_vat_inode->i_size -
1565 map->s_type_specific.s_virtual.
1566 s_start_offset) >> 2;
1567 brelse(bh);
1568 }
1569 map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1570 map->s_partition_len =
1571 sbi->s_partmaps[ino.partitionReferenceNum].
1572 s_partition_len;
1573 }
1574 return 0;
1575 }
1576
1577 static void udf_open_lvid(struct super_block *sb)
1578 {
1579 struct udf_sb_info *sbi = UDF_SB(sb);
1580 struct buffer_head *bh = sbi->s_lvid_bh;
1581 struct logicalVolIntegrityDesc *lvid;
1582 struct logicalVolIntegrityDescImpUse *lvidiu;
1583 if (!bh)
1584 return;
1585
1586 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1587 lvidiu = udf_sb_lvidiu(sbi);
1588
1589 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1590 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1591 udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1592 CURRENT_TIME);
1593 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1594
1595 lvid->descTag.descCRC = cpu_to_le16(
1596 udf_crc((char *)lvid + sizeof(tag),
1597 le16_to_cpu(lvid->descTag.descCRCLength), 0));
1598
1599 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1600 mark_buffer_dirty(bh);
1601 }
1602
1603 static void udf_close_lvid(struct super_block *sb)
1604 {
1605 struct udf_sb_info *sbi = UDF_SB(sb);
1606 struct buffer_head *bh = sbi->s_lvid_bh;
1607 struct logicalVolIntegrityDesc *lvid;
1608 struct logicalVolIntegrityDescImpUse *lvidiu;
1609
1610 if (!bh)
1611 return;
1612
1613 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1614
1615 if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1616 return;
1617
1618 lvidiu = udf_sb_lvidiu(sbi);
1619 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1620 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1621 udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1622 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1623 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1624 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1625 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1626 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1627 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1628 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1629
1630 lvid->descTag.descCRC = cpu_to_le16(
1631 udf_crc((char *)lvid + sizeof(tag),
1632 le16_to_cpu(lvid->descTag.descCRCLength),
1633 0));
1634
1635 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1636 mark_buffer_dirty(bh);
1637 }
1638
1639 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1640 {
1641 int i;
1642 int nr_groups = bitmap->s_nr_groups;
1643 int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1644 nr_groups);
1645
1646 for (i = 0; i < nr_groups; i++)
1647 if (bitmap->s_block_bitmap[i])
1648 brelse(bitmap->s_block_bitmap[i]);
1649
1650 if (size <= PAGE_SIZE)
1651 kfree(bitmap);
1652 else
1653 vfree(bitmap);
1654 }
1655
1656 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1657 {
1658 int i;
1659 struct inode *inode = NULL;
1660 struct udf_options uopt;
1661 kernel_lb_addr rootdir, fileset;
1662 struct udf_sb_info *sbi;
1663
1664 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1665 uopt.uid = -1;
1666 uopt.gid = -1;
1667 uopt.umask = 0;
1668
1669 sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1670 if (!sbi)
1671 return -ENOMEM;
1672
1673 sb->s_fs_info = sbi;
1674
1675 mutex_init(&sbi->s_alloc_mutex);
1676
1677 if (!udf_parse_options((char *)options, &uopt, false))
1678 goto error_out;
1679
1680 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1681 uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1682 udf_error(sb, "udf_read_super",
1683 "utf8 cannot be combined with iocharset\n");
1684 goto error_out;
1685 }
1686 #ifdef CONFIG_UDF_NLS
1687 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1688 uopt.nls_map = load_nls_default();
1689 if (!uopt.nls_map)
1690 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1691 else
1692 udf_debug("Using default NLS map\n");
1693 }
1694 #endif
1695 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1696 uopt.flags |= (1 << UDF_FLAG_UTF8);
1697
1698 fileset.logicalBlockNum = 0xFFFFFFFF;
1699 fileset.partitionReferenceNum = 0xFFFF;
1700
1701 sbi->s_flags = uopt.flags;
1702 sbi->s_uid = uopt.uid;
1703 sbi->s_gid = uopt.gid;
1704 sbi->s_umask = uopt.umask;
1705 sbi->s_nls_map = uopt.nls_map;
1706
1707 /* Set the block size for all transfers */
1708 if (!sb_min_blocksize(sb, uopt.blocksize)) {
1709 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1710 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1711 goto error_out;
1712 }
1713
1714 if (uopt.session == 0xFFFFFFFF)
1715 sbi->s_session = udf_get_last_session(sb);
1716 else
1717 sbi->s_session = uopt.session;
1718
1719 udf_debug("Multi-session=%d\n", sbi->s_session);
1720
1721 sbi->s_last_block = uopt.lastblock;
1722 sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1723 sbi->s_anchor[2] = uopt.anchor;
1724 sbi->s_anchor[3] = 256;
1725
1726 if (udf_check_valid(sb, uopt.novrs, silent)) {
1727 /* read volume recognition sequences */
1728 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1729 goto error_out;
1730 }
1731
1732 udf_find_anchor(sb);
1733
1734 /* Fill in the rest of the superblock */
1735 sb->s_op = &udf_sb_ops;
1736 sb->dq_op = NULL;
1737 sb->s_dirt = 0;
1738 sb->s_magic = UDF_SUPER_MAGIC;
1739 sb->s_time_gran = 1000;
1740
1741 if (udf_load_partition(sb, &fileset)) {
1742 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1743 goto error_out;
1744 }
1745
1746 udf_debug("Lastblock=%d\n", sbi->s_last_block);
1747
1748 if (sbi->s_lvid_bh) {
1749 struct logicalVolIntegrityDescImpUse *lvidiu =
1750 udf_sb_lvidiu(sbi);
1751 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1752 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1753 /* uint16_t maxUDFWriteRev =
1754 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1755
1756 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1757 printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1758 "(max is %x)\n",
1759 le16_to_cpu(lvidiu->minUDFReadRev),
1760 UDF_MAX_READ_VERSION);
1761 goto error_out;
1762 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1763 sb->s_flags |= MS_RDONLY;
1764
1765 sbi->s_udfrev = minUDFWriteRev;
1766
1767 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1768 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1769 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1770 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1771 }
1772
1773 if (!sbi->s_partitions) {
1774 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1775 goto error_out;
1776 }
1777
1778 if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1779 UDF_PART_FLAG_READ_ONLY) {
1780 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1781 "forcing readonly mount\n");
1782 sb->s_flags |= MS_RDONLY;
1783 }
1784
1785 if (udf_find_fileset(sb, &fileset, &rootdir)) {
1786 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1787 goto error_out;
1788 }
1789
1790 if (!silent) {
1791 timestamp ts;
1792 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1793 udf_info("UDF: Mounting volume '%s', "
1794 "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1795 sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1796 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1797 }
1798 if (!(sb->s_flags & MS_RDONLY))
1799 udf_open_lvid(sb);
1800
1801 /* Assign the root inode */
1802 /* assign inodes by physical block number */
1803 /* perhaps it's not extensible enough, but for now ... */
1804 inode = udf_iget(sb, rootdir);
1805 if (!inode) {
1806 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1807 "partition=%d\n",
1808 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1809 goto error_out;
1810 }
1811
1812 /* Allocate a dentry for the root inode */
1813 sb->s_root = d_alloc_root(inode);
1814 if (!sb->s_root) {
1815 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1816 iput(inode);
1817 goto error_out;
1818 }
1819 sb->s_maxbytes = MAX_LFS_FILESIZE;
1820 return 0;
1821
1822 error_out:
1823 if (sbi->s_vat_inode)
1824 iput(sbi->s_vat_inode);
1825 if (sbi->s_partitions) {
1826 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1827 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1828 iput(map->s_uspace.s_table);
1829 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1830 iput(map->s_fspace.s_table);
1831 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1832 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1833 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1834 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1835 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1836 for (i = 0; i < 4; i++)
1837 brelse(map->s_type_specific.s_sparing.
1838 s_spar_map[i]);
1839 }
1840 #ifdef CONFIG_UDF_NLS
1841 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1842 unload_nls(sbi->s_nls_map);
1843 #endif
1844 if (!(sb->s_flags & MS_RDONLY))
1845 udf_close_lvid(sb);
1846 brelse(sbi->s_lvid_bh);
1847
1848 kfree(sbi->s_partmaps);
1849 kfree(sbi);
1850 sb->s_fs_info = NULL;
1851
1852 return -EINVAL;
1853 }
1854
1855 static void udf_error(struct super_block *sb, const char *function,
1856 const char *fmt, ...)
1857 {
1858 va_list args;
1859
1860 if (!(sb->s_flags & MS_RDONLY)) {
1861 /* mark sb error */
1862 sb->s_dirt = 1;
1863 }
1864 va_start(args, fmt);
1865 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1866 va_end(args);
1867 printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1868 sb->s_id, function, error_buf);
1869 }
1870
1871 void udf_warning(struct super_block *sb, const char *function,
1872 const char *fmt, ...)
1873 {
1874 va_list args;
1875
1876 va_start(args, fmt);
1877 vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1878 va_end(args);
1879 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1880 sb->s_id, function, error_buf);
1881 }
1882
1883 static void udf_put_super(struct super_block *sb)
1884 {
1885 int i;
1886 struct udf_sb_info *sbi;
1887
1888 sbi = UDF_SB(sb);
1889 if (sbi->s_vat_inode)
1890 iput(sbi->s_vat_inode);
1891 if (sbi->s_partitions) {
1892 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1893 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1894 iput(map->s_uspace.s_table);
1895 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1896 iput(map->s_fspace.s_table);
1897 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1898 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1899 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1900 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1901 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1902 for (i = 0; i < 4; i++)
1903 brelse(map->s_type_specific.s_sparing.
1904 s_spar_map[i]);
1905 }
1906 #ifdef CONFIG_UDF_NLS
1907 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1908 unload_nls(sbi->s_nls_map);
1909 #endif
1910 if (!(sb->s_flags & MS_RDONLY))
1911 udf_close_lvid(sb);
1912 brelse(sbi->s_lvid_bh);
1913 kfree(sbi->s_partmaps);
1914 kfree(sb->s_fs_info);
1915 sb->s_fs_info = NULL;
1916 }
1917
1918 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1919 {
1920 struct super_block *sb = dentry->d_sb;
1921 struct udf_sb_info *sbi = UDF_SB(sb);
1922 struct logicalVolIntegrityDescImpUse *lvidiu;
1923
1924 if (sbi->s_lvid_bh != NULL)
1925 lvidiu = udf_sb_lvidiu(sbi);
1926 else
1927 lvidiu = NULL;
1928
1929 buf->f_type = UDF_SUPER_MAGIC;
1930 buf->f_bsize = sb->s_blocksize;
1931 buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1932 buf->f_bfree = udf_count_free(sb);
1933 buf->f_bavail = buf->f_bfree;
1934 buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1935 le32_to_cpu(lvidiu->numDirs)) : 0)
1936 + buf->f_bfree;
1937 buf->f_ffree = buf->f_bfree;
1938 /* __kernel_fsid_t f_fsid */
1939 buf->f_namelen = UDF_NAME_LEN - 2;
1940
1941 return 0;
1942 }
1943
1944 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1945 struct udf_bitmap *bitmap)
1946 {
1947 struct buffer_head *bh = NULL;
1948 unsigned int accum = 0;
1949 int index;
1950 int block = 0, newblock;
1951 kernel_lb_addr loc;
1952 uint32_t bytes;
1953 uint8_t *ptr;
1954 uint16_t ident;
1955 struct spaceBitmapDesc *bm;
1956
1957 lock_kernel();
1958
1959 loc.logicalBlockNum = bitmap->s_extPosition;
1960 loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1961 bh = udf_read_ptagged(sb, loc, 0, &ident);
1962
1963 if (!bh) {
1964 printk(KERN_ERR "udf: udf_count_free failed\n");
1965 goto out;
1966 } else if (ident != TAG_IDENT_SBD) {
1967 brelse(bh);
1968 printk(KERN_ERR "udf: udf_count_free failed\n");
1969 goto out;
1970 }
1971
1972 bm = (struct spaceBitmapDesc *)bh->b_data;
1973 bytes = le32_to_cpu(bm->numOfBytes);
1974 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1975 ptr = (uint8_t *)bh->b_data;
1976
1977 while (bytes > 0) {
1978 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
1979 accum += bitmap_weight((const unsigned long *)(ptr + index),
1980 cur_bytes * 8);
1981 bytes -= cur_bytes;
1982 if (bytes) {
1983 brelse(bh);
1984 newblock = udf_get_lb_pblock(sb, loc, ++block);
1985 bh = udf_tread(sb, newblock);
1986 if (!bh) {
1987 udf_debug("read failed\n");
1988 goto out;
1989 }
1990 index = 0;
1991 ptr = (uint8_t *)bh->b_data;
1992 }
1993 }
1994 brelse(bh);
1995
1996 out:
1997 unlock_kernel();
1998
1999 return accum;
2000 }
2001
2002 static unsigned int udf_count_free_table(struct super_block *sb,
2003 struct inode *table)
2004 {
2005 unsigned int accum = 0;
2006 uint32_t elen;
2007 kernel_lb_addr eloc;
2008 int8_t etype;
2009 struct extent_position epos;
2010
2011 lock_kernel();
2012
2013 epos.block = UDF_I(table)->i_location;
2014 epos.offset = sizeof(struct unallocSpaceEntry);
2015 epos.bh = NULL;
2016
2017 while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2018 accum += (elen >> table->i_sb->s_blocksize_bits);
2019
2020 brelse(epos.bh);
2021
2022 unlock_kernel();
2023
2024 return accum;
2025 }
2026
2027 static unsigned int udf_count_free(struct super_block *sb)
2028 {
2029 unsigned int accum = 0;
2030 struct udf_sb_info *sbi;
2031 struct udf_part_map *map;
2032
2033 sbi = UDF_SB(sb);
2034 if (sbi->s_lvid_bh) {
2035 struct logicalVolIntegrityDesc *lvid =
2036 (struct logicalVolIntegrityDesc *)
2037 sbi->s_lvid_bh->b_data;
2038 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2039 accum = le32_to_cpu(
2040 lvid->freeSpaceTable[sbi->s_partition]);
2041 if (accum == 0xFFFFFFFF)
2042 accum = 0;
2043 }
2044 }
2045
2046 if (accum)
2047 return accum;
2048
2049 map = &sbi->s_partmaps[sbi->s_partition];
2050 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2051 accum += udf_count_free_bitmap(sb,
2052 map->s_uspace.s_bitmap);
2053 }
2054 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2055 accum += udf_count_free_bitmap(sb,
2056 map->s_fspace.s_bitmap);
2057 }
2058 if (accum)
2059 return accum;
2060
2061 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2062 accum += udf_count_free_table(sb,
2063 map->s_uspace.s_table);
2064 }
2065 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2066 accum += udf_count_free_table(sb,
2067 map->s_fspace.s_table);
2068 }
2069
2070 return accum;
2071 }
Linux kernel - Deliverables
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