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[PATCH] Really ignore kmem_cache_destroy return value
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / udf / super.c
blob5dd356cbbda607de674b825d40ecf0c72fce490b
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 vol descs
37 * 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 <asm/byteorder.h>
56
57 #include <linux/udf_fs.h>
58 #include "udf_sb.h"
59 #include "udf_i.h"
60
61 #include <linux/init.h>
62 #include <asm/uaccess.h>
63
64 #define VDS_POS_PRIMARY_VOL_DESC 0
65 #define VDS_POS_UNALLOC_SPACE_DESC 1
66 #define VDS_POS_LOGICAL_VOL_DESC 2
67 #define VDS_POS_PARTITION_DESC 3
68 #define VDS_POS_IMP_USE_VOL_DESC 4
69 #define VDS_POS_VOL_DESC_PTR 5
70 #define VDS_POS_TERMINATING_DESC 6
71 #define VDS_POS_LENGTH 7
72
73 static char error_buf[1024];
74
75 /* These are the "meat" - everything else is stuffing */
76 static int udf_fill_super(struct super_block *, void *, int);
77 static void udf_put_super(struct super_block *);
78 static void udf_write_super(struct super_block *);
79 static int udf_remount_fs(struct super_block *, int *, char *);
80 static int udf_check_valid(struct super_block *, int, int);
81 static int udf_vrs(struct super_block *sb, int silent);
82 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
83 static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
84 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
85 static void udf_find_anchor(struct super_block *);
86 static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
87 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
88 static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
89 static void udf_load_partdesc(struct super_block *, struct buffer_head *);
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
95 /* UDF filesystem type */
96 static int udf_get_sb(struct file_system_type *fs_type,
97 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
98 {
99 return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
100 }
101
102 static struct file_system_type udf_fstype = {
103 .owner = THIS_MODULE,
104 .name = "udf",
105 .get_sb = udf_get_sb,
106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108 };
109
110 static kmem_cache_t * udf_inode_cachep;
111
112 static struct inode *udf_alloc_inode(struct super_block *sb)
113 {
114 struct udf_inode_info *ei;
115 ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
116 if (!ei)
117 return NULL;
118
119 ei->i_unique = 0;
120 ei->i_lenExtents = 0;
121 ei->i_next_alloc_block = 0;
122 ei->i_next_alloc_goal = 0;
123 ei->i_strat4096 = 0;
124
125 return &ei->vfs_inode;
126 }
127
128 static void udf_destroy_inode(struct inode *inode)
129 {
130 kmem_cache_free(udf_inode_cachep, UDF_I(inode));
131 }
132
133 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
134 {
135 struct udf_inode_info *ei = (struct udf_inode_info *) foo;
136
137 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
138 SLAB_CTOR_CONSTRUCTOR)
139 {
140 ei->i_ext.i_data = NULL;
141 inode_init_once(&ei->vfs_inode);
142 }
143 }
144
145 static int init_inodecache(void)
146 {
147 udf_inode_cachep = kmem_cache_create("udf_inode_cache",
148 sizeof(struct udf_inode_info),
149 0, (SLAB_RECLAIM_ACCOUNT|
150 SLAB_MEM_SPREAD),
151 init_once, NULL);
152 if (udf_inode_cachep == NULL)
153 return -ENOMEM;
154 return 0;
155 }
156
157 static void destroy_inodecache(void)
158 {
159 kmem_cache_destroy(udf_inode_cachep);
160 }
161
162 /* Superblock operations */
163 static struct super_operations udf_sb_ops = {
164 .alloc_inode = udf_alloc_inode,
165 .destroy_inode = udf_destroy_inode,
166 .write_inode = udf_write_inode,
167 .delete_inode = udf_delete_inode,
168 .clear_inode = udf_clear_inode,
169 .put_super = udf_put_super,
170 .write_super = udf_write_super,
171 .statfs = udf_statfs,
172 .remount_fs = udf_remount_fs,
173 };
174
175 struct udf_options
176 {
177 unsigned char novrs;
178 unsigned int blocksize;
179 unsigned int session;
180 unsigned int lastblock;
181 unsigned int anchor;
182 unsigned int volume;
183 unsigned short partition;
184 unsigned int fileset;
185 unsigned int rootdir;
186 unsigned int flags;
187 mode_t umask;
188 gid_t gid;
189 uid_t uid;
190 struct nls_table *nls_map;
191 };
192
193 static int __init init_udf_fs(void)
194 {
195 int err;
196 err = init_inodecache();
197 if (err)
198 goto out1;
199 err = register_filesystem(&udf_fstype);
200 if (err)
201 goto out;
202 return 0;
203 out:
204 destroy_inodecache();
205 out1:
206 return err;
207 }
208
209 static void __exit exit_udf_fs(void)
210 {
211 unregister_filesystem(&udf_fstype);
212 destroy_inodecache();
213 }
214
215 module_init(init_udf_fs)
216 module_exit(exit_udf_fs)
217
218 /*
219 * udf_parse_options
220 *
221 * PURPOSE
222 * Parse mount options.
223 *
224 * DESCRIPTION
225 * The following mount options are supported:
226 *
227 * gid= Set the default group.
228 * umask= Set the default umask.
229 * uid= Set the default user.
230 * bs= Set the block size.
231 * unhide Show otherwise hidden files.
232 * undelete Show deleted files in lists.
233 * adinicb Embed data in the inode (default)
234 * noadinicb Don't embed data in the inode
235 * shortad Use short ad's
236 * longad Use long ad's (default)
237 * nostrict Unset strict conformance
238 * iocharset= Set the NLS character set
239 *
240 * The remaining are for debugging and disaster recovery:
241 *
242 * novrs Skip volume sequence recognition
243 *
244 * The following expect a offset from 0.
245 *
246 * session= Set the CDROM session (default= last session)
247 * anchor= Override standard anchor location. (default= 256)
248 * volume= Override the VolumeDesc location. (unused)
249 * partition= Override the PartitionDesc location. (unused)
250 * lastblock= Set the last block of the filesystem/
251 *
252 * The following expect a offset from the partition root.
253 *
254 * fileset= Override the fileset block location. (unused)
255 * rootdir= Override the root directory location. (unused)
256 * WARNING: overriding the rootdir to a non-directory may
257 * yield highly unpredictable results.
258 *
259 * PRE-CONDITIONS
260 * options Pointer to mount options string.
261 * uopts Pointer to mount options variable.
262 *
263 * POST-CONDITIONS
264 * <return> 1 Mount options parsed okay.
265 * <return> 0 Error parsing mount options.
266 *
267 * HISTORY
268 * July 1, 1997 - Andrew E. Mileski
269 * Written, tested, and released.
270 */
271
272 enum {
273 Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
274 Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
275 Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
276 Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
277 Opt_rootdir, Opt_utf8, Opt_iocharset,
278 Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
279 };
280
281 static match_table_t tokens = {
282 {Opt_novrs, "novrs"},
283 {Opt_nostrict, "nostrict"},
284 {Opt_bs, "bs=%u"},
285 {Opt_unhide, "unhide"},
286 {Opt_undelete, "undelete"},
287 {Opt_noadinicb, "noadinicb"},
288 {Opt_adinicb, "adinicb"},
289 {Opt_shortad, "shortad"},
290 {Opt_longad, "longad"},
291 {Opt_uforget, "uid=forget"},
292 {Opt_uignore, "uid=ignore"},
293 {Opt_gforget, "gid=forget"},
294 {Opt_gignore, "gid=ignore"},
295 {Opt_gid, "gid=%u"},
296 {Opt_uid, "uid=%u"},
297 {Opt_umask, "umask=%o"},
298 {Opt_session, "session=%u"},
299 {Opt_lastblock, "lastblock=%u"},
300 {Opt_anchor, "anchor=%u"},
301 {Opt_volume, "volume=%u"},
302 {Opt_partition, "partition=%u"},
303 {Opt_fileset, "fileset=%u"},
304 {Opt_rootdir, "rootdir=%u"},
305 {Opt_utf8, "utf8"},
306 {Opt_iocharset, "iocharset=%s"},
307 {Opt_err, NULL}
308 };
309
310 static int
311 udf_parse_options(char *options, struct udf_options *uopt)
312 {
313 char *p;
314 int option;
315
316 uopt->novrs = 0;
317 uopt->blocksize = 2048;
318 uopt->partition = 0xFFFF;
319 uopt->session = 0xFFFFFFFF;
320 uopt->lastblock = 0;
321 uopt->anchor = 0;
322 uopt->volume = 0xFFFFFFFF;
323 uopt->rootdir = 0xFFFFFFFF;
324 uopt->fileset = 0xFFFFFFFF;
325 uopt->nls_map = NULL;
326
327 if (!options)
328 return 1;
329
330 while ((p = strsep(&options, ",")) != NULL)
331 {
332 substring_t args[MAX_OPT_ARGS];
333 int token;
334 if (!*p)
335 continue;
336
337 token = match_token(p, tokens, args);
338 switch (token)
339 {
340 case Opt_novrs:
341 uopt->novrs = 1;
342 case Opt_bs:
343 if (match_int(&args[0], &option))
344 return 0;
345 uopt->blocksize = option;
346 break;
347 case Opt_unhide:
348 uopt->flags |= (1 << UDF_FLAG_UNHIDE);
349 break;
350 case Opt_undelete:
351 uopt->flags |= (1 << UDF_FLAG_UNDELETE);
352 break;
353 case Opt_noadinicb:
354 uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
355 break;
356 case Opt_adinicb:
357 uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
358 break;
359 case Opt_shortad:
360 uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
361 break;
362 case Opt_longad:
363 uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
364 break;
365 case Opt_gid:
366 if (match_int(args, &option))
367 return 0;
368 uopt->gid = option;
369 break;
370 case Opt_uid:
371 if (match_int(args, &option))
372 return 0;
373 uopt->uid = option;
374 break;
375 case Opt_umask:
376 if (match_octal(args, &option))
377 return 0;
378 uopt->umask = option;
379 break;
380 case Opt_nostrict:
381 uopt->flags &= ~(1 << UDF_FLAG_STRICT);
382 break;
383 case Opt_session:
384 if (match_int(args, &option))
385 return 0;
386 uopt->session = option;
387 break;
388 case Opt_lastblock:
389 if (match_int(args, &option))
390 return 0;
391 uopt->lastblock = option;
392 break;
393 case Opt_anchor:
394 if (match_int(args, &option))
395 return 0;
396 uopt->anchor = option;
397 break;
398 case Opt_volume:
399 if (match_int(args, &option))
400 return 0;
401 uopt->volume = option;
402 break;
403 case Opt_partition:
404 if (match_int(args, &option))
405 return 0;
406 uopt->partition = option;
407 break;
408 case Opt_fileset:
409 if (match_int(args, &option))
410 return 0;
411 uopt->fileset = option;
412 break;
413 case Opt_rootdir:
414 if (match_int(args, &option))
415 return 0;
416 uopt->rootdir = option;
417 break;
418 case Opt_utf8:
419 uopt->flags |= (1 << UDF_FLAG_UTF8);
420 break;
421 #ifdef CONFIG_UDF_NLS
422 case Opt_iocharset:
423 uopt->nls_map = load_nls(args[0].from);
424 uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
425 break;
426 #endif
427 case Opt_uignore:
428 uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
429 break;
430 case Opt_uforget:
431 uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
432 break;
433 case Opt_gignore:
434 uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
435 break;
436 case Opt_gforget:
437 uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
438 break;
439 default:
440 printk(KERN_ERR "udf: bad mount option \"%s\" "
441 "or missing value\n", p);
442 return 0;
443 }
444 }
445 return 1;
446 }
447
448 void
449 udf_write_super(struct super_block *sb)
450 {
451 lock_kernel();
452 if (!(sb->s_flags & MS_RDONLY))
453 udf_open_lvid(sb);
454 sb->s_dirt = 0;
455 unlock_kernel();
456 }
457
458 static int
459 udf_remount_fs(struct super_block *sb, int *flags, char *options)
460 {
461 struct udf_options uopt;
462
463 uopt.flags = UDF_SB(sb)->s_flags ;
464 uopt.uid = UDF_SB(sb)->s_uid ;
465 uopt.gid = UDF_SB(sb)->s_gid ;
466 uopt.umask = UDF_SB(sb)->s_umask ;
467
468 if ( !udf_parse_options(options, &uopt) )
469 return -EINVAL;
470
471 UDF_SB(sb)->s_flags = uopt.flags;
472 UDF_SB(sb)->s_uid = uopt.uid;
473 UDF_SB(sb)->s_gid = uopt.gid;
474 UDF_SB(sb)->s_umask = uopt.umask;
475
476 if (UDF_SB_LVIDBH(sb)) {
477 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
478 if (write_rev > UDF_MAX_WRITE_VERSION)
479 *flags |= MS_RDONLY;
480 }
481
482 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
483 return 0;
484 if (*flags & MS_RDONLY)
485 udf_close_lvid(sb);
486 else
487 udf_open_lvid(sb);
488
489 return 0;
490 }
491
492 /*
493 * udf_set_blocksize
494 *
495 * PURPOSE
496 * Set the block size to be used in all transfers.
497 *
498 * DESCRIPTION
499 * To allow room for a DMA transfer, it is best to guess big when unsure.
500 * This routine picks 2048 bytes as the blocksize when guessing. This
501 * should be adequate until devices with larger block sizes become common.
502 *
503 * Note that the Linux kernel can currently only deal with blocksizes of
504 * 512, 1024, 2048, 4096, and 8192 bytes.
505 *
506 * PRE-CONDITIONS
507 * sb Pointer to _locked_ superblock.
508 *
509 * POST-CONDITIONS
510 * sb->s_blocksize Blocksize.
511 * sb->s_blocksize_bits log2 of blocksize.
512 * <return> 0 Blocksize is valid.
513 * <return> 1 Blocksize is invalid.
514 *
515 * HISTORY
516 * July 1, 1997 - Andrew E. Mileski
517 * Written, tested, and released.
518 */
519 static int
520 udf_set_blocksize(struct super_block *sb, int bsize)
521 {
522 if (!sb_min_blocksize(sb, bsize)) {
523 udf_debug("Bad block size (%d)\n", bsize);
524 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
525 return 0;
526 }
527 return sb->s_blocksize;
528 }
529
530 static int
531 udf_vrs(struct super_block *sb, int silent)
532 {
533 struct volStructDesc *vsd = NULL;
534 int sector = 32768;
535 int sectorsize;
536 struct buffer_head *bh = NULL;
537 int iso9660=0;
538 int nsr02=0;
539 int nsr03=0;
540
541 /* Block size must be a multiple of 512 */
542 if (sb->s_blocksize & 511)
543 return 0;
544
545 if (sb->s_blocksize < sizeof(struct volStructDesc))
546 sectorsize = sizeof(struct volStructDesc);
547 else
548 sectorsize = sb->s_blocksize;
549
550 sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
551
552 udf_debug("Starting at sector %u (%ld byte sectors)\n",
553 (sector >> sb->s_blocksize_bits), sb->s_blocksize);
554 /* Process the sequence (if applicable) */
555 for (;!nsr02 && !nsr03; sector += sectorsize)
556 {
557 /* Read a block */
558 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
559 if (!bh)
560 break;
561
562 /* Look for ISO descriptors */
563 vsd = (struct volStructDesc *)(bh->b_data +
564 (sector & (sb->s_blocksize - 1)));
565
566 if (vsd->stdIdent[0] == 0)
567 {
568 udf_release_data(bh);
569 break;
570 }
571 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
572 {
573 iso9660 = sector;
574 switch (vsd->structType)
575 {
576 case 0:
577 udf_debug("ISO9660 Boot Record found\n");
578 break;
579 case 1:
580 udf_debug("ISO9660 Primary Volume Descriptor found\n");
581 break;
582 case 2:
583 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
584 break;
585 case 3:
586 udf_debug("ISO9660 Volume Partition Descriptor found\n");
587 break;
588 case 255:
589 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
590 break;
591 default:
592 udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
593 break;
594 }
595 }
596 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
597 {
598 }
599 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
600 {
601 udf_release_data(bh);
602 break;
603 }
604 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
605 {
606 nsr02 = sector;
607 }
608 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
609 {
610 nsr03 = sector;
611 }
612 udf_release_data(bh);
613 }
614
615 if (nsr03)
616 return nsr03;
617 else if (nsr02)
618 return nsr02;
619 else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
620 return -1;
621 else
622 return 0;
623 }
624
625 /*
626 * udf_find_anchor
627 *
628 * PURPOSE
629 * Find an anchor volume descriptor.
630 *
631 * PRE-CONDITIONS
632 * sb Pointer to _locked_ superblock.
633 * lastblock Last block on media.
634 *
635 * POST-CONDITIONS
636 * <return> 1 if not found, 0 if ok
637 *
638 * HISTORY
639 * July 1, 1997 - Andrew E. Mileski
640 * Written, tested, and released.
641 */
642 static void
643 udf_find_anchor(struct super_block *sb)
644 {
645 int lastblock = UDF_SB_LASTBLOCK(sb);
646 struct buffer_head *bh = NULL;
647 uint16_t ident;
648 uint32_t location;
649 int i;
650
651 if (lastblock)
652 {
653 int varlastblock = udf_variable_to_fixed(lastblock);
654 int last[] = { lastblock, lastblock - 2,
655 lastblock - 150, lastblock - 152,
656 varlastblock, varlastblock - 2,
657 varlastblock - 150, varlastblock - 152 };
658
659 lastblock = 0;
660
661 /* Search for an anchor volume descriptor pointer */
662
663 /* according to spec, anchor is in either:
664 * block 256
665 * lastblock-256
666 * lastblock
667 * however, if the disc isn't closed, it could be 512 */
668
669 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
670 if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
671 {
672 ident = location = 0;
673 }
674 else
675 {
676 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
677 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
678 udf_release_data(bh);
679 }
680
681 if (ident == TAG_IDENT_AVDP)
682 {
683 if (location == last[i] - UDF_SB_SESSION(sb))
684 {
685 lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
686 UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
687 }
688 else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
689 {
690 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
691 lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
692 UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
693 }
694 else
695 udf_debug("Anchor found at block %d, location mismatch %d.\n",
696 last[i], location);
697 }
698 else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
699 {
700 lastblock = last[i];
701 UDF_SB_ANCHOR(sb)[3] = 512;
702 }
703 else
704 {
705 if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
706 {
707 ident = location = 0;
708 }
709 else
710 {
711 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
712 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
713 udf_release_data(bh);
714 }
715
716 if (ident == TAG_IDENT_AVDP &&
717 location == last[i] - 256 - UDF_SB_SESSION(sb))
718 {
719 lastblock = last[i];
720 UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
721 }
722 else
723 {
724 if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
725 {
726 ident = location = 0;
727 }
728 else
729 {
730 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
731 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
732 udf_release_data(bh);
733 }
734
735 if (ident == TAG_IDENT_AVDP &&
736 location == udf_variable_to_fixed(last[i]) - 256)
737 {
738 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
739 lastblock = udf_variable_to_fixed(last[i]);
740 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
741 }
742 }
743 }
744 }
745 }
746
747 if (!lastblock)
748 {
749 /* We havn't found the lastblock. check 312 */
750 if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
751 {
752 ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
753 location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
754 udf_release_data(bh);
755
756 if (ident == TAG_IDENT_AVDP && location == 256)
757 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
758 }
759 }
760
761 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
762 if (UDF_SB_ANCHOR(sb)[i])
763 {
764 if (!(bh = udf_read_tagged(sb,
765 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
766 {
767 UDF_SB_ANCHOR(sb)[i] = 0;
768 }
769 else
770 {
771 udf_release_data(bh);
772 if ((ident != TAG_IDENT_AVDP) && (i ||
773 (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
774 {
775 UDF_SB_ANCHOR(sb)[i] = 0;
776 }
777 }
778 }
779 }
780
781 UDF_SB_LASTBLOCK(sb) = lastblock;
782 }
783
784 static int
785 udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
786 {
787 struct buffer_head *bh = NULL;
788 long lastblock;
789 uint16_t ident;
790
791 if (fileset->logicalBlockNum != 0xFFFFFFFF ||
792 fileset->partitionReferenceNum != 0xFFFF)
793 {
794 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
795
796 if (!bh)
797 return 1;
798 else if (ident != TAG_IDENT_FSD)
799 {
800 udf_release_data(bh);
801 return 1;
802 }
803
804 }
805
806 if (!bh) /* Search backwards through the partitions */
807 {
808 kernel_lb_addr newfileset;
809
810 return 1;
811
812 for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
813 (newfileset.partitionReferenceNum != 0xFFFF &&
814 fileset->logicalBlockNum == 0xFFFFFFFF &&
815 fileset->partitionReferenceNum == 0xFFFF);
816 newfileset.partitionReferenceNum--)
817 {
818 lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
819 newfileset.logicalBlockNum = 0;
820
821 do
822 {
823 bh = udf_read_ptagged(sb, newfileset, 0, &ident);
824 if (!bh)
825 {
826 newfileset.logicalBlockNum ++;
827 continue;
828 }
829
830 switch (ident)
831 {
832 case TAG_IDENT_SBD:
833 {
834 struct spaceBitmapDesc *sp;
835 sp = (struct spaceBitmapDesc *)bh->b_data;
836 newfileset.logicalBlockNum += 1 +
837 ((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
838 >> sb->s_blocksize_bits);
839 udf_release_data(bh);
840 break;
841 }
842 case TAG_IDENT_FSD:
843 {
844 *fileset = newfileset;
845 break;
846 }
847 default:
848 {
849 newfileset.logicalBlockNum ++;
850 udf_release_data(bh);
851 bh = NULL;
852 break;
853 }
854 }
855 }
856 while (newfileset.logicalBlockNum < lastblock &&
857 fileset->logicalBlockNum == 0xFFFFFFFF &&
858 fileset->partitionReferenceNum == 0xFFFF);
859 }
860 }
861
862 if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
863 fileset->partitionReferenceNum != 0xFFFF) && bh)
864 {
865 udf_debug("Fileset at block=%d, partition=%d\n",
866 fileset->logicalBlockNum, fileset->partitionReferenceNum);
867
868 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
869 udf_load_fileset(sb, bh, root);
870 udf_release_data(bh);
871 return 0;
872 }
873 return 1;
874 }
875
876 static void
877 udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
878 {
879 struct primaryVolDesc *pvoldesc;
880 time_t recording;
881 long recording_usec;
882 struct ustr instr;
883 struct ustr outstr;
884
885 pvoldesc = (struct primaryVolDesc *)bh->b_data;
886
887 if ( udf_stamp_to_time(&recording, &recording_usec,
888 lets_to_cpu(pvoldesc->recordingDateAndTime)) )
889 {
890 kernel_timestamp ts;
891 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
892 udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
893 recording, recording_usec,
894 ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
895 UDF_SB_RECORDTIME(sb).tv_sec = recording;
896 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
897 }
898
899 if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
900 {
901 if (udf_CS0toUTF8(&outstr, &instr))
902 {
903 strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
904 outstr.u_len > 31 ? 31 : outstr.u_len);
905 udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
906 }
907 }
908
909 if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
910 {
911 if (udf_CS0toUTF8(&outstr, &instr))
912 udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
913 }
914 }
915
916 static void
917 udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
918 {
919 struct fileSetDesc *fset;
920
921 fset = (struct fileSetDesc *)bh->b_data;
922
923 *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
924
925 UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
926
927 udf_debug("Rootdir at block=%d, partition=%d\n",
928 root->logicalBlockNum, root->partitionReferenceNum);
929 }
930
931 static void
932 udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
933 {
934 struct partitionDesc *p;
935 int i;
936
937 p = (struct partitionDesc *)bh->b_data;
938
939 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
940 {
941 udf_debug("Searching map: (%d == %d)\n",
942 UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
943 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
944 {
945 UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
946 UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
947 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
948 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
949 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
950 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
951 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
952 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
953 if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
954 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;
955
956 if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
957 !strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
958 {
959 struct partitionHeaderDesc *phd;
960
961 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
962 if (phd->unallocSpaceTable.extLength)
963 {
964 kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };
965
966 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
967 udf_iget(sb, loc);
968 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
969 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
970 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
971 }
972 if (phd->unallocSpaceBitmap.extLength)
973 {
974 UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
975 if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
976 {
977 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
978 le32_to_cpu(phd->unallocSpaceBitmap.extLength);
979 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
980 le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
981 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
982 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
983 i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
984 }
985 }
986 if (phd->partitionIntegrityTable.extLength)
987 udf_debug("partitionIntegrityTable (part %d)\n", i);
988 if (phd->freedSpaceTable.extLength)
989 {
990 kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };
991
992 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
993 udf_iget(sb, loc);
994 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
995 udf_debug("freedSpaceTable (part %d) @ %ld\n",
996 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
997 }
998 if (phd->freedSpaceBitmap.extLength)
999 {
1000 UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
1001 if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL)
1002 {
1003 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
1004 le32_to_cpu(phd->freedSpaceBitmap.extLength);
1005 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
1006 le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1007 UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_BITMAP;
1008 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1009 i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
1010 }
1011 }
1012 }
1013 break;
1014 }
1015 }
1016 if (i == UDF_SB_NUMPARTS(sb))
1017 {
1018 udf_debug("Partition (%d) not found in partition map\n", le16_to_cpu(p->partitionNumber));
1019 }
1020 else
1021 {
1022 udf_debug("Partition (%d:%d type %x) starts at physical %d, block length %d\n",
1023 le16_to_cpu(p->partitionNumber), i, UDF_SB_PARTTYPE(sb,i),
1024 UDF_SB_PARTROOT(sb,i), UDF_SB_PARTLEN(sb,i));
1025 }
1026 }
1027
1028 static int
1029 udf_load_logicalvol(struct super_block *sb, struct buffer_head * bh, kernel_lb_addr *fileset)
1030 {
1031 struct logicalVolDesc *lvd;
1032 int i, j, offset;
1033 uint8_t type;
1034
1035 lvd = (struct logicalVolDesc *)bh->b_data;
1036
1037 UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1038
1039 for (i=0,offset=0;
1040 i<UDF_SB_NUMPARTS(sb) && offset<le32_to_cpu(lvd->mapTableLength);
1041 i++,offset+=((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength)
1042 {
1043 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1044 if (type == 1)
1045 {
1046 struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1047 UDF_SB_PARTTYPE(sb,i) = UDF_TYPE1_MAP15;
1048 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(gpm1->volSeqNum);
1049 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(gpm1->partitionNum);
1050 UDF_SB_PARTFUNC(sb,i) = NULL;
1051 }
1052 else if (type == 2)
1053 {
1054 struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1055 if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL)))
1056 {
1057 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150)
1058 {
1059 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP15;
1060 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt15;
1061 }
1062 else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200)
1063 {
1064 UDF_SB_PARTTYPE(sb,i) = UDF_VIRTUAL_MAP20;
1065 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_virt20;
1066 }
1067 }
1068 else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE)))
1069 {
1070 uint32_t loc;
1071 uint16_t ident;
1072 struct sparingTable *st;
1073 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1074
1075 UDF_SB_PARTTYPE(sb,i) = UDF_SPARABLE_MAP15;
1076 UDF_SB_TYPESPAR(sb,i).s_packet_len = le16_to_cpu(spm->packetLength);
1077 for (j=0; j<spm->numSparingTables; j++)
1078 {
1079 loc = le32_to_cpu(spm->locSparingTable[j]);
1080 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] =
1081 udf_read_tagged(sb, loc, loc, &ident);
1082 if (UDF_SB_TYPESPAR(sb,i).s_spar_map[j] != NULL)
1083 {
1084 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb,i).s_spar_map[j]->b_data;
1085 if (ident != 0 ||
1086 strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
1087 {
1088 udf_release_data(UDF_SB_TYPESPAR(sb,i).s_spar_map[j]);
1089 UDF_SB_TYPESPAR(sb,i).s_spar_map[j] = NULL;
1090 }
1091 }
1092 }
1093 UDF_SB_PARTFUNC(sb,i) = udf_get_pblock_spar15;
1094 }
1095 else
1096 {
1097 udf_debug("Unknown ident: %s\n", upm2->partIdent.ident);
1098 continue;
1099 }
1100 UDF_SB_PARTVSN(sb,i) = le16_to_cpu(upm2->volSeqNum);
1101 UDF_SB_PARTNUM(sb,i) = le16_to_cpu(upm2->partitionNum);
1102 }
1103 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1104 i, UDF_SB_PARTNUM(sb,i), type, UDF_SB_PARTVSN(sb,i));
1105 }
1106
1107 if (fileset)
1108 {
1109 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1110
1111 *fileset = lelb_to_cpu(la->extLocation);
1112 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1113 fileset->logicalBlockNum,
1114 fileset->partitionReferenceNum);
1115 }
1116 if (lvd->integritySeqExt.extLength)
1117 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1118 return 0;
1119 }
1120
1121 /*
1122 * udf_load_logicalvolint
1123 *
1124 */
1125 static void
1126 udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1127 {
1128 struct buffer_head *bh = NULL;
1129 uint16_t ident;
1130
1131 while (loc.extLength > 0 &&
1132 (bh = udf_read_tagged(sb, loc.extLocation,
1133 loc.extLocation, &ident)) &&
1134 ident == TAG_IDENT_LVID)
1135 {
1136 UDF_SB_LVIDBH(sb) = bh;
1137
1138 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1139 udf_load_logicalvolint(sb, leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1140
1141 if (UDF_SB_LVIDBH(sb) != bh)
1142 udf_release_data(bh);
1143 loc.extLength -= sb->s_blocksize;
1144 loc.extLocation ++;
1145 }
1146 if (UDF_SB_LVIDBH(sb) != bh)
1147 udf_release_data(bh);
1148 }
1149
1150 /*
1151 * udf_process_sequence
1152 *
1153 * PURPOSE
1154 * Process a main/reserve volume descriptor sequence.
1155 *
1156 * PRE-CONDITIONS
1157 * sb Pointer to _locked_ superblock.
1158 * block First block of first extent of the sequence.
1159 * lastblock Lastblock of first extent of the sequence.
1160 *
1161 * HISTORY
1162 * July 1, 1997 - Andrew E. Mileski
1163 * Written, tested, and released.
1164 */
1165 static int
1166 udf_process_sequence(struct super_block *sb, long block, long lastblock, kernel_lb_addr *fileset)
1167 {
1168 struct buffer_head *bh = NULL;
1169 struct udf_vds_record vds[VDS_POS_LENGTH];
1170 struct generic_desc *gd;
1171 struct volDescPtr *vdp;
1172 int done=0;
1173 int i,j;
1174 uint32_t vdsn;
1175 uint16_t ident;
1176 long next_s = 0, next_e = 0;
1177
1178 memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1179
1180 /* Read the main descriptor sequence */
1181 for (;(!done && block <= lastblock); block++)
1182 {
1183
1184 bh = udf_read_tagged(sb, block, block, &ident);
1185 if (!bh)
1186 break;
1187
1188 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1189 gd = (struct generic_desc *)bh->b_data;
1190 vdsn = le32_to_cpu(gd->volDescSeqNum);
1191 switch (ident)
1192 {
1193 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1194 if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum)
1195 {
1196 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1197 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1198 }
1199 break;
1200 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1201 if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum)
1202 {
1203 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1204 vds[VDS_POS_VOL_DESC_PTR].block = block;
1205
1206 vdp = (struct volDescPtr *)bh->b_data;
1207 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1208 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1209 next_e = next_e >> sb->s_blocksize_bits;
1210 next_e += next_s;
1211 }
1212 break;
1213 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1214 if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum)
1215 {
1216 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1217 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1218 }
1219 break;
1220 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1221 if (!vds[VDS_POS_PARTITION_DESC].block)
1222 vds[VDS_POS_PARTITION_DESC].block = block;
1223 break;
1224 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1225 if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum)
1226 {
1227 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1228 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1229 }
1230 break;
1231 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1232 if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum)
1233 {
1234 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1235 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1236 }
1237 break;
1238 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1239 vds[VDS_POS_TERMINATING_DESC].block = block;
1240 if (next_e)
1241 {
1242 block = next_s;
1243 lastblock = next_e;
1244 next_s = next_e = 0;
1245 }
1246 else
1247 done = 1;
1248 break;
1249 }
1250 udf_release_data(bh);
1251 }
1252 for (i=0; i<VDS_POS_LENGTH; i++)
1253 {
1254 if (vds[i].block)
1255 {
1256 bh = udf_read_tagged(sb, vds[i].block, vds[i].block, &ident);
1257
1258 if (i == VDS_POS_PRIMARY_VOL_DESC)
1259 udf_load_pvoldesc(sb, bh);
1260 else if (i == VDS_POS_LOGICAL_VOL_DESC)
1261 udf_load_logicalvol(sb, bh, fileset);
1262 else if (i == VDS_POS_PARTITION_DESC)
1263 {
1264 struct buffer_head *bh2 = NULL;
1265 udf_load_partdesc(sb, bh);
1266 for (j=vds[i].block+1; j<vds[VDS_POS_TERMINATING_DESC].block; j++)
1267 {
1268 bh2 = udf_read_tagged(sb, j, j, &ident);
1269 gd = (struct generic_desc *)bh2->b_data;
1270 if (ident == TAG_IDENT_PD)
1271 udf_load_partdesc(sb, bh2);
1272 udf_release_data(bh2);
1273 }
1274 }
1275 udf_release_data(bh);
1276 }
1277 }
1278
1279 return 0;
1280 }
1281
1282 /*
1283 * udf_check_valid()
1284 */
1285 static int
1286 udf_check_valid(struct super_block *sb, int novrs, int silent)
1287 {
1288 long block;
1289
1290 if (novrs)
1291 {
1292 udf_debug("Validity check skipped because of novrs option\n");
1293 return 0;
1294 }
1295 /* Check that it is NSR02 compliant */
1296 /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1297 else if ((block = udf_vrs(sb, silent)) == -1)
1298 {
1299 udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1300 if (!UDF_SB_LASTBLOCK(sb))
1301 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1302 return 0;
1303 }
1304 else
1305 return !block;
1306 }
1307
1308 static int
1309 udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1310 {
1311 struct anchorVolDescPtr *anchor;
1312 uint16_t ident;
1313 struct buffer_head *bh;
1314 long main_s, main_e, reserve_s, reserve_e;
1315 int i, j;
1316
1317 if (!sb)
1318 return 1;
1319
1320 for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1321 if (UDF_SB_ANCHOR(sb)[i] && (bh = udf_read_tagged(sb,
1322 UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
1323 {
1324 anchor = (struct anchorVolDescPtr *)bh->b_data;
1325
1326 /* Locate the main sequence */
1327 main_s = le32_to_cpu( anchor->mainVolDescSeqExt.extLocation );
1328 main_e = le32_to_cpu( anchor->mainVolDescSeqExt.extLength );
1329 main_e = main_e >> sb->s_blocksize_bits;
1330 main_e += main_s;
1331
1332 /* Locate the reserve sequence */
1333 reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1334 reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1335 reserve_e = reserve_e >> sb->s_blocksize_bits;
1336 reserve_e += reserve_s;
1337
1338 udf_release_data(bh);
1339
1340 /* Process the main & reserve sequences */
1341 /* responsible for finding the PartitionDesc(s) */
1342 if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1343 udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1344 {
1345 break;
1346 }
1347 }
1348 }
1349
1350 if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1351 udf_debug("No Anchor block found\n");
1352 return 1;
1353 } else
1354 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1355
1356 for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
1357 {
1358 switch UDF_SB_PARTTYPE(sb, i)
1359 {
1360 case UDF_VIRTUAL_MAP15:
1361 case UDF_VIRTUAL_MAP20:
1362 {
1363 kernel_lb_addr ino;
1364
1365 if (!UDF_SB_LASTBLOCK(sb))
1366 {
1367 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1368 udf_find_anchor(sb);
1369 }
1370
1371 if (!UDF_SB_LASTBLOCK(sb))
1372 {
1373 udf_debug("Unable to determine Lastblock (For Virtual Partition)\n");
1374 return 1;
1375 }
1376
1377 for (j=0; j<UDF_SB_NUMPARTS(sb); j++)
1378 {
1379 if (j != i &&
1380 UDF_SB_PARTVSN(sb,i) == UDF_SB_PARTVSN(sb,j) &&
1381 UDF_SB_PARTNUM(sb,i) == UDF_SB_PARTNUM(sb,j))
1382 {
1383 ino.partitionReferenceNum = j;
1384 ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) -
1385 UDF_SB_PARTROOT(sb,j);
1386 break;
1387 }
1388 }
1389
1390 if (j == UDF_SB_NUMPARTS(sb))
1391 return 1;
1392
1393 if (!(UDF_SB_VAT(sb) = udf_iget(sb, ino)))
1394 return 1;
1395
1396 if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP15)
1397 {
1398 UDF_SB_TYPEVIRT(sb,i).s_start_offset = udf_ext0_offset(UDF_SB_VAT(sb));
1399 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1400 }
1401 else if (UDF_SB_PARTTYPE(sb,i) == UDF_VIRTUAL_MAP20)
1402 {
1403 struct buffer_head *bh = NULL;
1404 uint32_t pos;
1405
1406 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1407 bh = sb_bread(sb, pos);
1408 UDF_SB_TYPEVIRT(sb,i).s_start_offset =
1409 le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1410 udf_ext0_offset(UDF_SB_VAT(sb));
1411 UDF_SB_TYPEVIRT(sb,i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1412 UDF_SB_TYPEVIRT(sb,i).s_start_offset) >> 2;
1413 udf_release_data(bh);
1414 }
1415 UDF_SB_PARTROOT(sb,i) = udf_get_pblock(sb, 0, i, 0);
1416 UDF_SB_PARTLEN(sb,i) = UDF_SB_PARTLEN(sb,ino.partitionReferenceNum);
1417 }
1418 }
1419 }
1420 return 0;
1421 }
1422
1423 static void udf_open_lvid(struct super_block *sb)
1424 {
1425 if (UDF_SB_LVIDBH(sb))
1426 {
1427 int i;
1428 kernel_timestamp cpu_time;
1429
1430 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1431 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1432 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1433 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1434 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1435
1436 UDF_SB_LVID(sb)->descTag.descCRC =
1437 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1438 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1439
1440 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1441 for (i=0; i<16; i++)
1442 if (i != 4)
1443 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1444 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1445
1446 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1447 }
1448 }
1449
1450 static void udf_close_lvid(struct super_block *sb)
1451 {
1452 if (UDF_SB_LVIDBH(sb) &&
1453 UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN)
1454 {
1455 int i;
1456 kernel_timestamp cpu_time;
1457
1458 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1459 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1460 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1461 UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1462 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1463 UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1464 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1465 UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1466 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1467 UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1468 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1469
1470 UDF_SB_LVID(sb)->descTag.descCRC =
1471 cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1472 le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1473
1474 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1475 for (i=0; i<16; i++)
1476 if (i != 4)
1477 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1478 ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1479
1480 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1481 }
1482 }
1483
1484 /*
1485 * udf_read_super
1486 *
1487 * PURPOSE
1488 * Complete the specified super block.
1489 *
1490 * PRE-CONDITIONS
1491 * sb Pointer to superblock to complete - never NULL.
1492 * sb->s_dev Device to read suberblock from.
1493 * options Pointer to mount options.
1494 * silent Silent flag.
1495 *
1496 * HISTORY
1497 * July 1, 1997 - Andrew E. Mileski
1498 * Written, tested, and released.
1499 */
1500 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1501 {
1502 int i;
1503 struct inode *inode=NULL;
1504 struct udf_options uopt;
1505 kernel_lb_addr rootdir, fileset;
1506 struct udf_sb_info *sbi;
1507
1508 uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1509 uopt.uid = -1;
1510 uopt.gid = -1;
1511 uopt.umask = 0;
1512
1513 sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1514 if (!sbi)
1515 return -ENOMEM;
1516 sb->s_fs_info = sbi;
1517 memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1518
1519 mutex_init(&sbi->s_alloc_mutex);
1520
1521 if (!udf_parse_options((char *)options, &uopt))
1522 goto error_out;
1523
1524 if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1525 uopt.flags & (1 << UDF_FLAG_NLS_MAP))
1526 {
1527 udf_error(sb, "udf_read_super",
1528 "utf8 cannot be combined with iocharset\n");
1529 goto error_out;
1530 }
1531 #ifdef CONFIG_UDF_NLS
1532 if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map)
1533 {
1534 uopt.nls_map = load_nls_default();
1535 if (!uopt.nls_map)
1536 uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1537 else
1538 udf_debug("Using default NLS map\n");
1539 }
1540 #endif
1541 if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1542 uopt.flags |= (1 << UDF_FLAG_UTF8);
1543
1544 fileset.logicalBlockNum = 0xFFFFFFFF;
1545 fileset.partitionReferenceNum = 0xFFFF;
1546
1547 UDF_SB(sb)->s_flags = uopt.flags;
1548 UDF_SB(sb)->s_uid = uopt.uid;
1549 UDF_SB(sb)->s_gid = uopt.gid;
1550 UDF_SB(sb)->s_umask = uopt.umask;
1551 UDF_SB(sb)->s_nls_map = uopt.nls_map;
1552
1553 /* Set the block size for all transfers */
1554 if (!udf_set_blocksize(sb, uopt.blocksize))
1555 goto error_out;
1556
1557 if ( uopt.session == 0xFFFFFFFF )
1558 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1559 else
1560 UDF_SB_SESSION(sb) = uopt.session;
1561
1562 udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1563
1564 UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1565 UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1566 UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1567 UDF_SB_ANCHOR(sb)[3] = 256;
1568
1569 if (udf_check_valid(sb, uopt.novrs, silent)) /* read volume recognition sequences */
1570 {
1571 printk("UDF-fs: No VRS found\n");
1572 goto error_out;
1573 }
1574
1575 udf_find_anchor(sb);
1576
1577 /* Fill in the rest of the superblock */
1578 sb->s_op = &udf_sb_ops;
1579 sb->dq_op = NULL;
1580 sb->s_dirt = 0;
1581 sb->s_magic = UDF_SUPER_MAGIC;
1582 sb->s_time_gran = 1000;
1583
1584 if (udf_load_partition(sb, &fileset))
1585 {
1586 printk("UDF-fs: No partition found (1)\n");
1587 goto error_out;
1588 }
1589
1590 udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1591
1592 if ( UDF_SB_LVIDBH(sb) )
1593 {
1594 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1595 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1596 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1597
1598 if (minUDFReadRev > UDF_MAX_READ_VERSION)
1599 {
1600 printk("UDF-fs: minUDFReadRev=%x (max is %x)\n",
1601 le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1602 UDF_MAX_READ_VERSION);
1603 goto error_out;
1604 }
1605 else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1606 {
1607 sb->s_flags |= MS_RDONLY;
1608 }
1609
1610 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1611
1612 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1613 UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1614 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1615 UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1616 }
1617
1618 if ( !UDF_SB_NUMPARTS(sb) )
1619 {
1620 printk("UDF-fs: No partition found (2)\n");
1621 goto error_out;
1622 }
1623
1624 if ( udf_find_fileset(sb, &fileset, &rootdir) )
1625 {
1626 printk("UDF-fs: No fileset found\n");
1627 goto error_out;
1628 }
1629
1630 if (!silent)
1631 {
1632 kernel_timestamp ts;
1633 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1634 udf_info("UDF %s (%s) Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1635 UDFFS_VERSION, UDFFS_DATE,
1636 UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1637 ts.typeAndTimezone);
1638 }
1639 if (!(sb->s_flags & MS_RDONLY))
1640 udf_open_lvid(sb);
1641
1642 /* Assign the root inode */
1643 /* assign inodes by physical block number */
1644 /* perhaps it's not extensible enough, but for now ... */
1645 inode = udf_iget(sb, rootdir);
1646 if (!inode)
1647 {
1648 printk("UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1649 rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1650 goto error_out;
1651 }
1652
1653 /* Allocate a dentry for the root inode */
1654 sb->s_root = d_alloc_root(inode);
1655 if (!sb->s_root)
1656 {
1657 printk("UDF-fs: Couldn't allocate root dentry\n");
1658 iput(inode);
1659 goto error_out;
1660 }
1661 sb->s_maxbytes = 1<<30;
1662 return 0;
1663
1664 error_out:
1665 if (UDF_SB_VAT(sb))
1666 iput(UDF_SB_VAT(sb));
1667 if (UDF_SB_NUMPARTS(sb))
1668 {
1669 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1670 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1671 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1672 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1673 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1674 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1675 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1676 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1677 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1678 {
1679 for (i=0; i<4; i++)
1680 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1681 }
1682 }
1683 #ifdef CONFIG_UDF_NLS
1684 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1685 unload_nls(UDF_SB(sb)->s_nls_map);
1686 #endif
1687 if (!(sb->s_flags & MS_RDONLY))
1688 udf_close_lvid(sb);
1689 udf_release_data(UDF_SB_LVIDBH(sb));
1690 UDF_SB_FREE(sb);
1691 kfree(sbi);
1692 sb->s_fs_info = NULL;
1693 return -EINVAL;
1694 }
1695
1696 void udf_error(struct super_block *sb, const char *function,
1697 const char *fmt, ...)
1698 {
1699 va_list args;
1700
1701 if (!(sb->s_flags & MS_RDONLY))
1702 {
1703 /* mark sb error */
1704 sb->s_dirt = 1;
1705 }
1706 va_start(args, fmt);
1707 vsprintf(error_buf, fmt, args);
1708 va_end(args);
1709 printk (KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1710 sb->s_id, function, error_buf);
1711 }
1712
1713 void udf_warning(struct super_block *sb, const char *function,
1714 const char *fmt, ...)
1715 {
1716 va_list args;
1717
1718 va_start (args, fmt);
1719 vsprintf(error_buf, fmt, args);
1720 va_end(args);
1721 printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1722 sb->s_id, function, error_buf);
1723 }
1724
1725 /*
1726 * udf_put_super
1727 *
1728 * PURPOSE
1729 * Prepare for destruction of the superblock.
1730 *
1731 * DESCRIPTION
1732 * Called before the filesystem is unmounted.
1733 *
1734 * HISTORY
1735 * July 1, 1997 - Andrew E. Mileski
1736 * Written, tested, and released.
1737 */
1738 static void
1739 udf_put_super(struct super_block *sb)
1740 {
1741 int i;
1742
1743 if (UDF_SB_VAT(sb))
1744 iput(UDF_SB_VAT(sb));
1745 if (UDF_SB_NUMPARTS(sb))
1746 {
1747 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1748 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1749 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1750 iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1751 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1752 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_uspace);
1753 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1754 UDF_SB_FREE_BITMAP(sb,UDF_SB_PARTITION(sb),s_fspace);
1755 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15)
1756 {
1757 for (i=0; i<4; i++)
1758 udf_release_data(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1759 }
1760 }
1761 #ifdef CONFIG_UDF_NLS
1762 if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1763 unload_nls(UDF_SB(sb)->s_nls_map);
1764 #endif
1765 if (!(sb->s_flags & MS_RDONLY))
1766 udf_close_lvid(sb);
1767 udf_release_data(UDF_SB_LVIDBH(sb));
1768 UDF_SB_FREE(sb);
1769 kfree(sb->s_fs_info);
1770 sb->s_fs_info = NULL;
1771 }
1772
1773 /*
1774 * udf_stat_fs
1775 *
1776 * PURPOSE
1777 * Return info about the filesystem.
1778 *
1779 * DESCRIPTION
1780 * Called by sys_statfs()
1781 *
1782 * HISTORY
1783 * July 1, 1997 - Andrew E. Mileski
1784 * Written, tested, and released.
1785 */
1786 static int
1787 udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1788 {
1789 struct super_block *sb = dentry->d_sb;
1790
1791 buf->f_type = UDF_SUPER_MAGIC;
1792 buf->f_bsize = sb->s_blocksize;
1793 buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1794 buf->f_bfree = udf_count_free(sb);
1795 buf->f_bavail = buf->f_bfree;
1796 buf->f_files = (UDF_SB_LVIDBH(sb) ?
1797 (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1798 le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1799 buf->f_ffree = buf->f_bfree;
1800 /* __kernel_fsid_t f_fsid */
1801 buf->f_namelen = UDF_NAME_LEN-2;
1802
1803 return 0;
1804 }
1805
1806 static unsigned char udf_bitmap_lookup[16] = {
1807 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1808 };
1809
1810 static unsigned int
1811 udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1812 {
1813 struct buffer_head *bh = NULL;
1814 unsigned int accum = 0;
1815 int index;
1816 int block = 0, newblock;
1817 kernel_lb_addr loc;
1818 uint32_t bytes;
1819 uint8_t value;
1820 uint8_t *ptr;
1821 uint16_t ident;
1822 struct spaceBitmapDesc *bm;
1823
1824 lock_kernel();
1825
1826 loc.logicalBlockNum = bitmap->s_extPosition;
1827 loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1828 bh = udf_read_ptagged(sb, loc, 0, &ident);
1829
1830 if (!bh)
1831 {
1832 printk(KERN_ERR "udf: udf_count_free failed\n");
1833 goto out;
1834 }
1835 else if (ident != TAG_IDENT_SBD)
1836 {
1837 udf_release_data(bh);
1838 printk(KERN_ERR "udf: udf_count_free failed\n");
1839 goto out;
1840 }
1841
1842 bm = (struct spaceBitmapDesc *)bh->b_data;
1843 bytes = le32_to_cpu(bm->numOfBytes);
1844 index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1845 ptr = (uint8_t *)bh->b_data;
1846
1847 while ( bytes > 0 )
1848 {
1849 while ((bytes > 0) && (index < sb->s_blocksize))
1850 {
1851 value = ptr[index];
1852 accum += udf_bitmap_lookup[ value & 0x0f ];
1853 accum += udf_bitmap_lookup[ value >> 4 ];
1854 index++;
1855 bytes--;
1856 }
1857 if ( bytes )
1858 {
1859 udf_release_data(bh);
1860 newblock = udf_get_lb_pblock(sb, loc, ++block);
1861 bh = udf_tread(sb, newblock);
1862 if (!bh)
1863 {
1864 udf_debug("read failed\n");
1865 goto out;
1866 }
1867 index = 0;
1868 ptr = (uint8_t *)bh->b_data;
1869 }
1870 }
1871 udf_release_data(bh);
1872
1873 out:
1874 unlock_kernel();
1875
1876 return accum;
1877 }
1878
1879 static unsigned int
1880 udf_count_free_table(struct super_block *sb, struct inode * table)
1881 {
1882 unsigned int accum = 0;
1883 uint32_t extoffset, elen;
1884 kernel_lb_addr bloc, eloc;
1885 int8_t etype;
1886 struct buffer_head *bh = NULL;
1887
1888 lock_kernel();
1889
1890 bloc = UDF_I_LOCATION(table);
1891 extoffset = sizeof(struct unallocSpaceEntry);
1892
1893 while ((etype = udf_next_aext(table, &bloc, &extoffset, &eloc, &elen, &bh, 1)) != -1)
1894 {
1895 accum += (elen >> table->i_sb->s_blocksize_bits);
1896 }
1897 udf_release_data(bh);
1898
1899 unlock_kernel();
1900
1901 return accum;
1902 }
1903
1904 static unsigned int
1905 udf_count_free(struct super_block *sb)
1906 {
1907 unsigned int accum = 0;
1908
1909 if (UDF_SB_LVIDBH(sb))
1910 {
1911 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb))
1912 {
1913 accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1914
1915 if (accum == 0xFFFFFFFF)
1916 accum = 0;
1917 }
1918 }
1919
1920 if (accum)
1921 return accum;
1922
1923 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1924 {
1925 accum += udf_count_free_bitmap(sb,
1926 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1927 }
1928 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1929 {
1930 accum += udf_count_free_bitmap(sb,
1931 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1932 }
1933 if (accum)
1934 return accum;
1935
1936 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1937 {
1938 accum += udf_count_free_table(sb,
1939 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1940 }
1941 if (UDF_SB_PARTFLAGS(sb,UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1942 {
1943 accum += udf_count_free_table(sb,
1944 UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1945 }
1946
1947 return accum;
1948 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree