57788f1ba2dabedfed8a9b7f7286eb3b42176cc2
[linux-3.10.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 <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 *,
84                                kernel_lb_addr *);
85 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
86 static void udf_find_anchor(struct super_block *);
87 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
88                             kernel_lb_addr *);
89 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
91                              kernel_lb_addr *);
92 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
93 static void udf_open_lvid(struct super_block *);
94 static void udf_close_lvid(struct super_block *);
95 static unsigned int udf_count_free(struct super_block *);
96 static int udf_statfs(struct dentry *, struct kstatfs *);
97
98 /* UDF filesystem type */
99 static int udf_get_sb(struct file_system_type *fs_type,
100                       int flags, const char *dev_name, void *data,
101                       struct vfsmount *mnt)
102 {
103         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
104 }
105
106 static struct file_system_type udf_fstype = {
107         .owner          = THIS_MODULE,
108         .name           = "udf",
109         .get_sb         = udf_get_sb,
110         .kill_sb        = kill_block_super,
111         .fs_flags       = FS_REQUIRES_DEV,
112 };
113
114 static struct kmem_cache *udf_inode_cachep;
115
116 static struct inode *udf_alloc_inode(struct super_block *sb)
117 {
118         struct udf_inode_info *ei;
119         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
120         if (!ei)
121                 return NULL;
122
123         ei->i_unique = 0;
124         ei->i_lenExtents = 0;
125         ei->i_next_alloc_block = 0;
126         ei->i_next_alloc_goal = 0;
127         ei->i_strat4096 = 0;
128
129         return &ei->vfs_inode;
130 }
131
132 static void udf_destroy_inode(struct inode *inode)
133 {
134         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
135 }
136
137 static void init_once(struct kmem_cache *cachep, void *foo)
138 {
139         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
140
141         ei->i_ext.i_data = NULL;
142         inode_init_once(&ei->vfs_inode);
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);
152         if (!udf_inode_cachep)
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 const 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         unsigned char novrs;
177         unsigned int blocksize;
178         unsigned int session;
179         unsigned int lastblock;
180         unsigned int anchor;
181         unsigned int volume;
182         unsigned short partition;
183         unsigned int fileset;
184         unsigned int rootdir;
185         unsigned int flags;
186         mode_t umask;
187         gid_t gid;
188         uid_t uid;
189         struct nls_table *nls_map;
190 };
191
192 static int __init init_udf_fs(void)
193 {
194         int err;
195
196         err = init_inodecache();
197         if (err)
198                 goto out1;
199         err = register_filesystem(&udf_fstype);
200         if (err)
201                 goto out;
202
203         return 0;
204
205 out:
206         destroy_inodecache();
207
208 out1:
209         return err;
210 }
211
212 static void __exit exit_udf_fs(void)
213 {
214         unregister_filesystem(&udf_fstype);
215         destroy_inodecache();
216 }
217
218 module_init(init_udf_fs)
219 module_exit(exit_udf_fs)
220
221 /*
222  * udf_parse_options
223  *
224  * PURPOSE
225  *      Parse mount options.
226  *
227  * DESCRIPTION
228  *      The following mount options are supported:
229  *
230  *      gid=            Set the default group.
231  *      umask=          Set the default umask.
232  *      uid=            Set the default user.
233  *      bs=             Set the block size.
234  *      unhide          Show otherwise hidden files.
235  *      undelete        Show deleted files in lists.
236  *      adinicb         Embed data in the inode (default)
237  *      noadinicb       Don't embed data in the inode
238  *      shortad         Use short ad's
239  *      longad          Use long ad's (default)
240  *      nostrict        Unset strict conformance
241  *      iocharset=      Set the NLS character set
242  *
243  *      The remaining are for debugging and disaster recovery:
244  *
245  *      novrs           Skip volume sequence recognition
246  *
247  *      The following expect a offset from 0.
248  *
249  *      session=        Set the CDROM session (default= last session)
250  *      anchor=         Override standard anchor location. (default= 256)
251  *      volume=         Override the VolumeDesc location. (unused)
252  *      partition=      Override the PartitionDesc location. (unused)
253  *      lastblock=      Set the last block of the filesystem/
254  *
255  *      The following expect a offset from the partition root.
256  *
257  *      fileset=        Override the fileset block location. (unused)
258  *      rootdir=        Override the root directory location. (unused)
259  *              WARNING: overriding the rootdir to a non-directory may
260  *              yield highly unpredictable results.
261  *
262  * PRE-CONDITIONS
263  *      options         Pointer to mount options string.
264  *      uopts           Pointer to mount options variable.
265  *
266  * POST-CONDITIONS
267  *      <return>        1       Mount options parsed okay.
268  *      <return>        0       Error parsing mount options.
269  *
270  * HISTORY
271  *      July 1, 1997 - Andrew E. Mileski
272  *      Written, tested, and released.
273  */
274
275 enum {
276         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
277         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
278         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
279         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
280         Opt_rootdir, Opt_utf8, Opt_iocharset,
281         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
282 };
283
284 static match_table_t tokens = {
285         {Opt_novrs,     "novrs"},
286         {Opt_nostrict,  "nostrict"},
287         {Opt_bs,        "bs=%u"},
288         {Opt_unhide,    "unhide"},
289         {Opt_undelete,  "undelete"},
290         {Opt_noadinicb, "noadinicb"},
291         {Opt_adinicb,   "adinicb"},
292         {Opt_shortad,   "shortad"},
293         {Opt_longad,    "longad"},
294         {Opt_uforget,   "uid=forget"},
295         {Opt_uignore,   "uid=ignore"},
296         {Opt_gforget,   "gid=forget"},
297         {Opt_gignore,   "gid=ignore"},
298         {Opt_gid,       "gid=%u"},
299         {Opt_uid,       "uid=%u"},
300         {Opt_umask,     "umask=%o"},
301         {Opt_session,   "session=%u"},
302         {Opt_lastblock, "lastblock=%u"},
303         {Opt_anchor,    "anchor=%u"},
304         {Opt_volume,    "volume=%u"},
305         {Opt_partition, "partition=%u"},
306         {Opt_fileset,   "fileset=%u"},
307         {Opt_rootdir,   "rootdir=%u"},
308         {Opt_utf8,      "utf8"},
309         {Opt_iocharset, "iocharset=%s"},
310         {Opt_err,       NULL}
311 };
312
313 static int udf_parse_options(char *options, struct udf_options *uopt)
314 {
315         char *p;
316         int option;
317
318         uopt->novrs = 0;
319         uopt->blocksize = 2048;
320         uopt->partition = 0xFFFF;
321         uopt->session = 0xFFFFFFFF;
322         uopt->lastblock = 0;
323         uopt->anchor = 0;
324         uopt->volume = 0xFFFFFFFF;
325         uopt->rootdir = 0xFFFFFFFF;
326         uopt->fileset = 0xFFFFFFFF;
327         uopt->nls_map = NULL;
328
329         if (!options)
330                 return 1;
331
332         while ((p = strsep(&options, ",")) != NULL) {
333                 substring_t args[MAX_OPT_ARGS];
334                 int token;
335                 if (!*p)
336                         continue;
337
338                 token = match_token(p, tokens, args);
339                 switch (token) {
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                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
370                         break;
371                 case Opt_uid:
372                         if (match_int(args, &option))
373                                 return 0;
374                         uopt->uid = option;
375                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
376                         break;
377                 case Opt_umask:
378                         if (match_octal(args, &option))
379                                 return 0;
380                         uopt->umask = option;
381                         break;
382                 case Opt_nostrict:
383                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
384                         break;
385                 case Opt_session:
386                         if (match_int(args, &option))
387                                 return 0;
388                         uopt->session = option;
389                         break;
390                 case Opt_lastblock:
391                         if (match_int(args, &option))
392                                 return 0;
393                         uopt->lastblock = option;
394                         break;
395                 case Opt_anchor:
396                         if (match_int(args, &option))
397                                 return 0;
398                         uopt->anchor = option;
399                         break;
400                 case Opt_volume:
401                         if (match_int(args, &option))
402                                 return 0;
403                         uopt->volume = option;
404                         break;
405                 case Opt_partition:
406                         if (match_int(args, &option))
407                                 return 0;
408                         uopt->partition = option;
409                         break;
410                 case Opt_fileset:
411                         if (match_int(args, &option))
412                                 return 0;
413                         uopt->fileset = option;
414                         break;
415                 case Opt_rootdir:
416                         if (match_int(args, &option))
417                                 return 0;
418                         uopt->rootdir = option;
419                         break;
420                 case Opt_utf8:
421                         uopt->flags |= (1 << UDF_FLAG_UTF8);
422                         break;
423 #ifdef CONFIG_UDF_NLS
424                 case Opt_iocharset:
425                         uopt->nls_map = load_nls(args[0].from);
426                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
427                         break;
428 #endif
429                 case Opt_uignore:
430                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
431                         break;
432                 case Opt_uforget:
433                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
434                         break;
435                 case Opt_gignore:
436                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
437                         break;
438                 case Opt_gforget:
439                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
440                         break;
441                 default:
442                         printk(KERN_ERR "udf: bad mount option \"%s\" "
443                                "or missing value\n", p);
444                         return 0;
445                 }
446         }
447         return 1;
448 }
449
450 void udf_write_super(struct super_block *sb)
451 {
452         lock_kernel();
453
454         if (!(sb->s_flags & MS_RDONLY))
455                 udf_open_lvid(sb);
456         sb->s_dirt = 0;
457
458         unlock_kernel();
459 }
460
461 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
462 {
463         struct udf_options uopt;
464
465         uopt.flags = UDF_SB(sb)->s_flags;
466         uopt.uid   = UDF_SB(sb)->s_uid;
467         uopt.gid   = UDF_SB(sb)->s_gid;
468         uopt.umask = UDF_SB(sb)->s_umask;
469
470         if (!udf_parse_options(options, &uopt))
471                 return -EINVAL;
472
473         UDF_SB(sb)->s_flags = uopt.flags;
474         UDF_SB(sb)->s_uid   = uopt.uid;
475         UDF_SB(sb)->s_gid   = uopt.gid;
476         UDF_SB(sb)->s_umask = uopt.umask;
477
478         if (UDF_SB_LVIDBH(sb)) {
479                 int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
480                 if (write_rev > UDF_MAX_WRITE_VERSION)
481                         *flags |= MS_RDONLY;
482         }
483
484         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
485                 return 0;
486         if (*flags & MS_RDONLY)
487                 udf_close_lvid(sb);
488         else
489                 udf_open_lvid(sb);
490
491         return 0;
492 }
493
494 /*
495  * udf_set_blocksize
496  *
497  * PURPOSE
498  *      Set the block size to be used in all transfers.
499  *
500  * DESCRIPTION
501  *      To allow room for a DMA transfer, it is best to guess big when unsure.
502  *      This routine picks 2048 bytes as the blocksize when guessing. This
503  *      should be adequate until devices with larger block sizes become common.
504  *
505  *      Note that the Linux kernel can currently only deal with blocksizes of
506  *      512, 1024, 2048, 4096, and 8192 bytes.
507  *
508  * PRE-CONDITIONS
509  *      sb                      Pointer to _locked_ superblock.
510  *
511  * POST-CONDITIONS
512  *      sb->s_blocksize         Blocksize.
513  *      sb->s_blocksize_bits    log2 of blocksize.
514  *      <return>        0       Blocksize is valid.
515  *      <return>        1       Blocksize is invalid.
516  *
517  * HISTORY
518  *      July 1, 1997 - Andrew E. Mileski
519  *      Written, tested, and released.
520  */
521 static int udf_set_blocksize(struct super_block *sb, int bsize)
522 {
523         if (!sb_min_blocksize(sb, bsize)) {
524                 udf_debug("Bad block size (%d)\n", bsize);
525                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
526                 return 0;
527         }
528
529         return sb->s_blocksize;
530 }
531
532 static int udf_vrs(struct super_block *sb, int silent)
533 {
534         struct volStructDesc *vsd = NULL;
535         int sector = 32768;
536         int sectorsize;
537         struct buffer_head *bh = NULL;
538         int iso9660 = 0;
539         int nsr02 = 0;
540         int nsr03 = 0;
541
542         /* Block size must be a multiple of 512 */
543         if (sb->s_blocksize & 511)
544                 return 0;
545
546         if (sb->s_blocksize < sizeof(struct volStructDesc))
547                 sectorsize = sizeof(struct volStructDesc);
548         else
549                 sectorsize = sb->s_blocksize;
550
551         sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
552
553         udf_debug("Starting at sector %u (%ld byte sectors)\n",
554                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
555         /* Process the sequence (if applicable) */
556         for (; !nsr02 && !nsr03; sector += sectorsize) {
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                         brelse(bh);
568                         break;
569                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
570                                     VSD_STD_ID_LEN)) {
571                         iso9660 = sector;
572                         switch (vsd->structType) {
573                         case 0:
574                                 udf_debug("ISO9660 Boot Record found\n");
575                                 break;
576                         case 1:
577                                 udf_debug("ISO9660 Primary Volume Descriptor "
578                                           "found\n");
579                                 break;
580                         case 2:
581                                 udf_debug("ISO9660 Supplementary Volume "
582                                           "Descriptor found\n");
583                                 break;
584                         case 3:
585                                 udf_debug("ISO9660 Volume Partition Descriptor "
586                                           "found\n");
587                                 break;
588                         case 255:
589                                 udf_debug("ISO9660 Volume Descriptor Set "
590                                           "Terminator found\n");
591                                 break;
592                         default:
593                                 udf_debug("ISO9660 VRS (%u) found\n",
594                                           vsd->structType);
595                                 break;
596                         }
597                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
598                                     VSD_STD_ID_LEN))
599                         ; /* nothing */
600                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
601                                     VSD_STD_ID_LEN)) {
602                         brelse(bh);
603                         break;
604                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
605                                     VSD_STD_ID_LEN))
606                         nsr02 = sector;
607                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
608                                     VSD_STD_ID_LEN))
609                         nsr03 = sector;
610                 brelse(bh);
611         }
612
613         if (nsr03)
614                 return nsr03;
615         else if (nsr02)
616                 return nsr02;
617         else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
618                 return -1;
619         else
620                 return 0;
621 }
622
623 /*
624  * udf_find_anchor
625  *
626  * PURPOSE
627  *      Find an anchor volume descriptor.
628  *
629  * PRE-CONDITIONS
630  *      sb                      Pointer to _locked_ superblock.
631  *      lastblock               Last block on media.
632  *
633  * POST-CONDITIONS
634  *      <return>                1 if not found, 0 if ok
635  *
636  * HISTORY
637  *      July 1, 1997 - Andrew E. Mileski
638  *      Written, tested, and released.
639  */
640 static void udf_find_anchor(struct super_block *sb)
641 {
642         int lastblock = UDF_SB_LASTBLOCK(sb);
643         struct buffer_head *bh = NULL;
644         uint16_t ident;
645         uint32_t location;
646         int i;
647
648         if (lastblock) {
649                 int varlastblock = udf_variable_to_fixed(lastblock);
650                 int last[] =  { lastblock, lastblock - 2,
651                                 lastblock - 150, lastblock - 152,
652                                 varlastblock, varlastblock - 2,
653                                 varlastblock - 150, varlastblock - 152 };
654
655                 lastblock = 0;
656
657                 /* Search for an anchor volume descriptor pointer */
658
659                 /*  according to spec, anchor is in either:
660                  *     block 256
661                  *     lastblock-256
662                  *     lastblock
663                  *  however, if the disc isn't closed, it could be 512 */
664
665                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
666                         ident = location = 0;
667                         if (last[i] >= 0) {
668                                 bh = sb_bread(sb, last[i]);
669                                 if (bh) {
670                                         tag *t = (tag *)bh->b_data;
671                                         ident = le16_to_cpu(t->tagIdent);
672                                         location = le32_to_cpu(t->tagLocation);
673                                         brelse(bh);
674                                 }
675                         }
676
677                         if (ident == TAG_IDENT_AVDP) {
678                                 if (location == last[i] - UDF_SB_SESSION(sb)) {
679                                         lastblock = last[i] - UDF_SB_SESSION(sb);
680                                         UDF_SB_ANCHOR(sb)[0] = lastblock;
681                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
682                                 } else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb)) {
683                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
684                                         lastblock = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
685                                         UDF_SB_ANCHOR(sb)[0] = lastblock;
686                                         UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
687                                 } else {
688                                         udf_debug("Anchor found at block %d, location mismatch %d.\n",
689                                                   last[i], location);
690                                 }
691                         } else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE) {
692                                 lastblock = last[i];
693                                 UDF_SB_ANCHOR(sb)[3] = 512;
694                         } else {
695                                 ident = location = 0;
696                                 if (last[i] >= 256) {
697                                         bh = sb_bread(sb, last[i] - 256);
698                                         if (bh) {
699                                                 tag *t = (tag *)bh->b_data;
700                                                 ident = le16_to_cpu(t->tagIdent);
701                                                 location = le32_to_cpu(t->tagLocation);
702                                                 brelse(bh);
703                                         }
704                                 }
705
706                                 if (ident == TAG_IDENT_AVDP &&
707                                     location == last[i] - 256 - UDF_SB_SESSION(sb)) {
708                                         lastblock = last[i];
709                                         UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
710                                 } else {
711                                         ident = location = 0;
712                                         if (last[i] >= 312 + UDF_SB_SESSION(sb)) {
713                                                 bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb));
714                                                 if (bh) {
715                                                         tag *t = (tag *)bh->b_data;
716                                                         ident = le16_to_cpu(t->tagIdent);
717                                                         location = le32_to_cpu(t->tagLocation);
718                                                         brelse(bh);
719                                                 }
720                                         }
721
722                                         if (ident == TAG_IDENT_AVDP &&
723                                             location == udf_variable_to_fixed(last[i]) - 256) {
724                                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
725                                                 lastblock = udf_variable_to_fixed(last[i]);
726                                                 UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
727                                         }
728                                 }
729                         }
730                 }
731         }
732
733         if (!lastblock) {
734                 /* We haven't found the lastblock. check 312 */
735                 bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb));
736                 if (bh) {
737                         tag *t = (tag *)bh->b_data;
738                         ident = le16_to_cpu(t->tagIdent);
739                         location = le32_to_cpu(t->tagLocation);
740                         brelse(bh);
741
742                         if (ident == TAG_IDENT_AVDP && location == 256)
743                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
744                 }
745         }
746
747         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
748                 if (UDF_SB_ANCHOR(sb)[i]) {
749                         bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
750                                              UDF_SB_ANCHOR(sb)[i], &ident);
751                         if (!bh)
752                                 UDF_SB_ANCHOR(sb)[i] = 0;
753                         else {
754                                 brelse(bh);
755                                 if ((ident != TAG_IDENT_AVDP) &&
756                                     (i || (ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
757                                         UDF_SB_ANCHOR(sb)[i] = 0;
758                         }
759                 }
760         }
761
762         UDF_SB_LASTBLOCK(sb) = lastblock;
763 }
764
765 static int udf_find_fileset(struct super_block *sb,
766                             kernel_lb_addr *fileset,
767                             kernel_lb_addr *root)
768 {
769         struct buffer_head *bh = NULL;
770         long lastblock;
771         uint16_t ident;
772
773         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
774             fileset->partitionReferenceNum != 0xFFFF) {
775                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
776
777                 if (!bh) {
778                         return 1;
779                 } else if (ident != TAG_IDENT_FSD) {
780                         brelse(bh);
781                         return 1;
782                 }
783
784         }
785
786         if (!bh) {
787                 /* Search backwards through the partitions */
788                 kernel_lb_addr newfileset;
789
790 /* --> cvg: FIXME - is it reasonable? */
791                 return 1;
792
793                 for (newfileset.partitionReferenceNum = UDF_SB_NUMPARTS(sb) - 1;
794                      (newfileset.partitionReferenceNum != 0xFFFF &&
795                       fileset->logicalBlockNum == 0xFFFFFFFF &&
796                       fileset->partitionReferenceNum == 0xFFFF);
797                      newfileset.partitionReferenceNum--) {
798                         lastblock = UDF_SB_PARTLEN(sb,
799                                         newfileset.partitionReferenceNum);
800                         newfileset.logicalBlockNum = 0;
801
802                         do {
803                                 bh = udf_read_ptagged(sb, newfileset, 0,
804                                                       &ident);
805                                 if (!bh) {
806                                         newfileset.logicalBlockNum++;
807                                         continue;
808                                 }
809
810                                 switch (ident) {
811                                 case TAG_IDENT_SBD:
812                                 {
813                                         struct spaceBitmapDesc *sp;
814                                         sp = (struct spaceBitmapDesc *)bh->b_data;
815                                         newfileset.logicalBlockNum += 1 +
816                                                 ((le32_to_cpu(sp->numOfBytes) +
817                                                   sizeof(struct spaceBitmapDesc) - 1)
818                                                  >> sb->s_blocksize_bits);
819                                         brelse(bh);
820                                         break;
821                                 }
822                                 case TAG_IDENT_FSD:
823                                         *fileset = newfileset;
824                                         break;
825                                 default:
826                                         newfileset.logicalBlockNum++;
827                                         brelse(bh);
828                                         bh = NULL;
829                                         break;
830                                 }
831                         } while (newfileset.logicalBlockNum < lastblock &&
832                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
833                                  fileset->partitionReferenceNum == 0xFFFF);
834                 }
835         }
836
837         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
838              fileset->partitionReferenceNum != 0xFFFF) && bh) {
839                 udf_debug("Fileset at block=%d, partition=%d\n",
840                           fileset->logicalBlockNum,
841                           fileset->partitionReferenceNum);
842
843                 UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
844                 udf_load_fileset(sb, bh, root);
845                 brelse(bh);
846                 return 0;
847         }
848         return 1;
849 }
850
851 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
852 {
853         struct primaryVolDesc *pvoldesc;
854         time_t recording;
855         long recording_usec;
856         struct ustr instr;
857         struct ustr outstr;
858
859         pvoldesc = (struct primaryVolDesc *)bh->b_data;
860
861         if (udf_stamp_to_time(&recording, &recording_usec,
862                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
863                 kernel_timestamp ts;
864                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
865                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
866                           " %02u:%02u (%x)\n",
867                           recording, recording_usec,
868                           ts.year, ts.month, ts.day, ts.hour,
869                           ts.minute, ts.typeAndTimezone);
870                 UDF_SB_RECORDTIME(sb).tv_sec = recording;
871                 UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
872         }
873
874         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32)) {
875                 if (udf_CS0toUTF8(&outstr, &instr)) {
876                         strncpy(UDF_SB_VOLIDENT(sb), outstr.u_name,
877                                 outstr.u_len > 31 ? 31 : outstr.u_len);
878                         udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
879                 }
880         }
881
882         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128)) {
883                 if (udf_CS0toUTF8(&outstr, &instr))
884                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
885         }
886 }
887
888 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
889                              kernel_lb_addr *root)
890 {
891         struct fileSetDesc *fset;
892
893         fset = (struct fileSetDesc *)bh->b_data;
894
895         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
896
897         UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);
898
899         udf_debug("Rootdir at block=%d, partition=%d\n",
900                   root->logicalBlockNum, root->partitionReferenceNum);
901 }
902
903 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
904 {
905         struct partitionDesc *p;
906         int i;
907
908         p = (struct partitionDesc *)bh->b_data;
909
910         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
911                 udf_debug("Searching map: (%d == %d)\n",
912                           UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
913                 if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber)) {
914                         UDF_SB_PARTLEN(sb, i) = le32_to_cpu(p->partitionLength); /* blocks */
915                         UDF_SB_PARTROOT(sb, i) = le32_to_cpu(p->partitionStartingLocation);
916                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
917                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_READ_ONLY;
918                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
919                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_WRITE_ONCE;
920                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
921                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_REWRITABLE;
922                         if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
923                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_OVERWRITABLE;
924
925                         if (!strcmp(p->partitionContents.ident,
926                                     PD_PARTITION_CONTENTS_NSR02) ||
927                             !strcmp(p->partitionContents.ident,
928                                     PD_PARTITION_CONTENTS_NSR03)) {
929                                 struct partitionHeaderDesc *phd;
930
931                                 phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
932                                 if (phd->unallocSpaceTable.extLength) {
933                                         kernel_lb_addr loc = {
934                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
935                                                 .partitionReferenceNum = i,
936                                         };
937
938                                         UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
939                                                 udf_iget(sb, loc);
940                                         if (!UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table) {
941                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
942                                                 return 1;
943                                         }
944                                         UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_UNALLOC_TABLE;
945                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
946                                                   i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
947                                 }
948                                 if (phd->unallocSpaceBitmap.extLength) {
949                                         UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
950                                         if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL) {
951                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
952                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
953                                                 UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
954                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
955                                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
956                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
957                                                           i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
958                                         }
959                                 }
960                                 if (phd->partitionIntegrityTable.extLength)
961                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
962                                 if (phd->freedSpaceTable.extLength) {
963                                         kernel_lb_addr loc = {
964                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
965                                                 .partitionReferenceNum = i,
966                                         };
967
968                                         UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
969                                                 udf_iget(sb, loc);
970                                         if (!UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table) {
971                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
972                                                 return 1;
973                                         }
974                                         UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_FREED_TABLE;
975                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
976                                                   i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
977                                 }
978                                 if (phd->freedSpaceBitmap.extLength) {
979                                         UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
980                                         if (UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap != NULL) {
981                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extLength =
982                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
983                                                 UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition =
984                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
985                                                 UDF_SB_PARTFLAGS(sb, i) |= UDF_PART_FLAG_FREED_BITMAP;
986                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
987                                                           i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_bitmap->s_extPosition);
988                                         }
989                                 }
990                         }
991                         break;
992                 }
993         }
994         if (i == UDF_SB_NUMPARTS(sb)) {
995                 udf_debug("Partition (%d) not found in partition map\n",
996                           le16_to_cpu(p->partitionNumber));
997         } else {
998                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
999                           "block length %d\n",
1000                           le16_to_cpu(p->partitionNumber), i,
1001                           UDF_SB_PARTTYPE(sb, i), UDF_SB_PARTROOT(sb, i),
1002                           UDF_SB_PARTLEN(sb, i));
1003         }
1004         return 0;
1005 }
1006
1007 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1008                                kernel_lb_addr *fileset)
1009 {
1010         struct logicalVolDesc *lvd;
1011         int i, j, offset;
1012         uint8_t type;
1013
1014         lvd = (struct logicalVolDesc *)bh->b_data;
1015
1016         UDF_SB_ALLOC_PARTMAPS(sb, le32_to_cpu(lvd->numPartitionMaps));
1017
1018         for (i = 0, offset = 0;
1019              i < UDF_SB_NUMPARTS(sb) && offset < le32_to_cpu(lvd->mapTableLength);
1020              i++, offset += ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapLength) {
1021                 type = ((struct genericPartitionMap *)&(lvd->partitionMaps[offset]))->partitionMapType;
1022                 if (type == 1) {
1023                         struct genericPartitionMap1 *gpm1 = (struct genericPartitionMap1 *)&(lvd->partitionMaps[offset]);
1024                         UDF_SB_PARTTYPE(sb, i) = UDF_TYPE1_MAP15;
1025                         UDF_SB_PARTVSN(sb, i) = le16_to_cpu(gpm1->volSeqNum);
1026                         UDF_SB_PARTNUM(sb, i) = le16_to_cpu(gpm1->partitionNum);
1027                         UDF_SB_PARTFUNC(sb, i) = NULL;
1028                 } else if (type == 2) {
1029                         struct udfPartitionMap2 *upm2 = (struct udfPartitionMap2 *)&(lvd->partitionMaps[offset]);
1030                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, strlen(UDF_ID_VIRTUAL))) {
1031                                 if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0150) {
1032                                         UDF_SB_PARTTYPE(sb, i) = UDF_VIRTUAL_MAP15;
1033                                         UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_virt15;
1034                                 } else if (le16_to_cpu(((__le16 *)upm2->partIdent.identSuffix)[0]) == 0x0200) {
1035                                         UDF_SB_PARTTYPE(sb, i) = UDF_VIRTUAL_MAP20;
1036                                         UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_virt20;
1037                                 }
1038                         } else if (!strncmp(upm2->partIdent.ident, UDF_ID_SPARABLE, strlen(UDF_ID_SPARABLE))) {
1039                                 uint32_t loc;
1040                                 uint16_t ident;
1041                                 struct sparingTable *st;
1042                                 struct sparablePartitionMap *spm = (struct sparablePartitionMap *)&(lvd->partitionMaps[offset]);
1043
1044                                 UDF_SB_PARTTYPE(sb, i) = UDF_SPARABLE_MAP15;
1045                                 UDF_SB_TYPESPAR(sb, i).s_packet_len = le16_to_cpu(spm->packetLength);
1046                                 for (j = 0; j < spm->numSparingTables; j++) {
1047                                         loc = le32_to_cpu(spm->locSparingTable[j]);
1048                                         UDF_SB_TYPESPAR(sb, i).s_spar_map[j] =
1049                                                 udf_read_tagged(sb, loc, loc, &ident);
1050                                         if (UDF_SB_TYPESPAR(sb, i).s_spar_map[j] != NULL) {
1051                                                 st = (struct sparingTable *)UDF_SB_TYPESPAR(sb, i).s_spar_map[j]->b_data;
1052                                                 if (ident != 0 ||
1053                                                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING))) {
1054                                                         brelse(UDF_SB_TYPESPAR(sb, i).s_spar_map[j]);
1055                                                         UDF_SB_TYPESPAR(sb, i).s_spar_map[j] = NULL;
1056                                                 }
1057                                         }
1058                                 }
1059                                 UDF_SB_PARTFUNC(sb, i) = udf_get_pblock_spar15;
1060                         } else {
1061                                 udf_debug("Unknown ident: %s\n",
1062                                           upm2->partIdent.ident);
1063                                 continue;
1064                         }
1065                         UDF_SB_PARTVSN(sb, i) = le16_to_cpu(upm2->volSeqNum);
1066                         UDF_SB_PARTNUM(sb, i) = le16_to_cpu(upm2->partitionNum);
1067                 }
1068                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1069                           i, UDF_SB_PARTNUM(sb, i), type,
1070                           UDF_SB_PARTVSN(sb, i));
1071         }
1072
1073         if (fileset) {
1074                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1075
1076                 *fileset = lelb_to_cpu(la->extLocation);
1077                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1078                           "partition=%d\n", fileset->logicalBlockNum,
1079                           fileset->partitionReferenceNum);
1080         }
1081         if (lvd->integritySeqExt.extLength)
1082                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1083
1084         return 0;
1085 }
1086
1087 /*
1088  * udf_load_logicalvolint
1089  *
1090  */
1091 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1092 {
1093         struct buffer_head *bh = NULL;
1094         uint16_t ident;
1095
1096         while (loc.extLength > 0 &&
1097                (bh = udf_read_tagged(sb, loc.extLocation,
1098                                      loc.extLocation, &ident)) &&
1099                ident == TAG_IDENT_LVID) {
1100                 UDF_SB_LVIDBH(sb) = bh;
1101
1102                 if (UDF_SB_LVID(sb)->nextIntegrityExt.extLength)
1103                         udf_load_logicalvolint(sb,
1104                                 leea_to_cpu(UDF_SB_LVID(sb)->nextIntegrityExt));
1105
1106                 if (UDF_SB_LVIDBH(sb) != bh)
1107                         brelse(bh);
1108                 loc.extLength -= sb->s_blocksize;
1109                 loc.extLocation++;
1110         }
1111         if (UDF_SB_LVIDBH(sb) != bh)
1112                 brelse(bh);
1113 }
1114
1115 /*
1116  * udf_process_sequence
1117  *
1118  * PURPOSE
1119  *      Process a main/reserve volume descriptor sequence.
1120  *
1121  * PRE-CONDITIONS
1122  *      sb                      Pointer to _locked_ superblock.
1123  *      block                   First block of first extent of the sequence.
1124  *      lastblock               Lastblock of first extent of the sequence.
1125  *
1126  * HISTORY
1127  *      July 1, 1997 - Andrew E. Mileski
1128  *      Written, tested, and released.
1129  */
1130 static int udf_process_sequence(struct super_block *sb, long block,
1131                                 long lastblock, kernel_lb_addr *fileset)
1132 {
1133         struct buffer_head *bh = NULL;
1134         struct udf_vds_record vds[VDS_POS_LENGTH];
1135         struct generic_desc *gd;
1136         struct volDescPtr *vdp;
1137         int done = 0;
1138         int i, j;
1139         uint32_t vdsn;
1140         uint16_t ident;
1141         long next_s = 0, next_e = 0;
1142
1143         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1144
1145         /* Read the main descriptor sequence */
1146         for (; (!done && block <= lastblock); block++) {
1147
1148                 bh = udf_read_tagged(sb, block, block, &ident);
1149                 if (!bh)
1150                         break;
1151
1152                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1153                 gd = (struct generic_desc *)bh->b_data;
1154                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1155                 switch (ident) {
1156                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1157                         if (vdsn >= vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum) {
1158                                 vds[VDS_POS_PRIMARY_VOL_DESC].volDescSeqNum = vdsn;
1159                                 vds[VDS_POS_PRIMARY_VOL_DESC].block = block;
1160                         }
1161                         break;
1162                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1163                         if (vdsn >= vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum) {
1164                                 vds[VDS_POS_VOL_DESC_PTR].volDescSeqNum = vdsn;
1165                                 vds[VDS_POS_VOL_DESC_PTR].block = block;
1166
1167                                 vdp = (struct volDescPtr *)bh->b_data;
1168                                 next_s = le32_to_cpu(vdp->nextVolDescSeqExt.extLocation);
1169                                 next_e = le32_to_cpu(vdp->nextVolDescSeqExt.extLength);
1170                                 next_e = next_e >> sb->s_blocksize_bits;
1171                                 next_e += next_s;
1172                         }
1173                         break;
1174                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1175                         if (vdsn >= vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum) {
1176                                 vds[VDS_POS_IMP_USE_VOL_DESC].volDescSeqNum = vdsn;
1177                                 vds[VDS_POS_IMP_USE_VOL_DESC].block = block;
1178                         }
1179                         break;
1180                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1181                         if (!vds[VDS_POS_PARTITION_DESC].block)
1182                                 vds[VDS_POS_PARTITION_DESC].block = block;
1183                         break;
1184                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1185                         if (vdsn >= vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum) {
1186                                 vds[VDS_POS_LOGICAL_VOL_DESC].volDescSeqNum = vdsn;
1187                                 vds[VDS_POS_LOGICAL_VOL_DESC].block = block;
1188                         }
1189                         break;
1190                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1191                         if (vdsn >= vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum) {
1192                                 vds[VDS_POS_UNALLOC_SPACE_DESC].volDescSeqNum = vdsn;
1193                                 vds[VDS_POS_UNALLOC_SPACE_DESC].block = block;
1194                         }
1195                         break;
1196                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1197                         vds[VDS_POS_TERMINATING_DESC].block = block;
1198                         if (next_e) {
1199                                 block = next_s;
1200                                 lastblock = next_e;
1201                                 next_s = next_e = 0;
1202                         } else {
1203                                 done = 1;
1204                         }
1205                         break;
1206                 }
1207                 brelse(bh);
1208         }
1209         for (i = 0; i < VDS_POS_LENGTH; i++) {
1210                 if (vds[i].block) {
1211                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1212                                              &ident);
1213
1214                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1215                                 udf_load_pvoldesc(sb, bh);
1216                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1217                                 udf_load_logicalvol(sb, bh, fileset);
1218                         } else if (i == VDS_POS_PARTITION_DESC) {
1219                                 struct buffer_head *bh2 = NULL;
1220                                 if (udf_load_partdesc(sb, bh)) {
1221                                         brelse(bh);
1222                                         return 1;
1223                                 }
1224                                 for (j = vds[i].block + 1;
1225                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1226                                      j++) {
1227                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1228                                         gd = (struct generic_desc *)bh2->b_data;
1229                                         if (ident == TAG_IDENT_PD)
1230                                                 if (udf_load_partdesc(sb,
1231                                                                       bh2)) {
1232                                                         brelse(bh);
1233                                                         brelse(bh2);
1234                                                         return 1;
1235                                                 }
1236                                         brelse(bh2);
1237                                 }
1238                         }
1239                         brelse(bh);
1240                 }
1241         }
1242
1243         return 0;
1244 }
1245
1246 /*
1247  * udf_check_valid()
1248  */
1249 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1250 {
1251         long block;
1252
1253         if (novrs) {
1254                 udf_debug("Validity check skipped because of novrs option\n");
1255                 return 0;
1256         }
1257         /* Check that it is NSR02 compliant */
1258         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1259         else {
1260                 block = udf_vrs(sb, silent);
1261                 if (block == -1) {
1262                         udf_debug("Failed to read byte 32768. Assuming open "
1263                                   "disc. Skipping validity check\n");
1264                         if (!UDF_SB_LASTBLOCK(sb))
1265                                 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1266                         return 0;
1267                 } else
1268                         return !block;
1269         }
1270 }
1271
1272 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1273 {
1274         struct anchorVolDescPtr *anchor;
1275         uint16_t ident;
1276         struct buffer_head *bh;
1277         long main_s, main_e, reserve_s, reserve_e;
1278         int i, j;
1279
1280         if (!sb)
1281                 return 1;
1282
1283         for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
1284                 if (UDF_SB_ANCHOR(sb)[i] &&
1285                     (bh = udf_read_tagged(sb, UDF_SB_ANCHOR(sb)[i],
1286                                           UDF_SB_ANCHOR(sb)[i], &ident))) {
1287                         anchor = (struct anchorVolDescPtr *)bh->b_data;
1288
1289                         /* Locate the main sequence */
1290                         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1291                         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1292                         main_e = main_e >> sb->s_blocksize_bits;
1293                         main_e += main_s;
1294
1295                         /* Locate the reserve sequence */
1296                         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1297                         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1298                         reserve_e = reserve_e >> sb->s_blocksize_bits;
1299                         reserve_e += reserve_s;
1300
1301                         brelse(bh);
1302
1303                         /* Process the main & reserve sequences */
1304                         /* responsible for finding the PartitionDesc(s) */
1305                         if (!(udf_process_sequence(sb, main_s, main_e, fileset) &&
1306                               udf_process_sequence(sb, reserve_s, reserve_e, fileset)))
1307                                 break;
1308                 }
1309         }
1310
1311         if (i == ARRAY_SIZE(UDF_SB_ANCHOR(sb))) {
1312                 udf_debug("No Anchor block found\n");
1313                 return 1;
1314         } else
1315                 udf_debug("Using anchor in block %d\n", UDF_SB_ANCHOR(sb)[i]);
1316
1317         for (i = 0; i < UDF_SB_NUMPARTS(sb); i++) {
1318                 kernel_lb_addr uninitialized_var(ino);
1319                 switch (UDF_SB_PARTTYPE(sb, i)) {
1320                 case UDF_VIRTUAL_MAP15:
1321                 case UDF_VIRTUAL_MAP20:
1322                         if (!UDF_SB_LASTBLOCK(sb)) {
1323                                 UDF_SB_LASTBLOCK(sb) = udf_get_last_block(sb);
1324                                 udf_find_anchor(sb);
1325                         }
1326
1327                         if (!UDF_SB_LASTBLOCK(sb)) {
1328                                 udf_debug("Unable to determine Lastblock (For "
1329                                           "Virtual Partition)\n");
1330                                 return 1;
1331                         }
1332
1333                         for (j = 0; j < UDF_SB_NUMPARTS(sb); j++) {
1334                                 if (j != i &&
1335                                     UDF_SB_PARTVSN(sb, i) == UDF_SB_PARTVSN(sb, j) &&
1336                                     UDF_SB_PARTNUM(sb, i) == UDF_SB_PARTNUM(sb, j)) {
1337                                         ino.partitionReferenceNum = j;
1338                                         ino.logicalBlockNum = UDF_SB_LASTBLOCK(sb) - UDF_SB_PARTROOT(sb, j);
1339                                         break;
1340                                 }
1341                         }
1342
1343                         if (j == UDF_SB_NUMPARTS(sb))
1344                                 return 1;
1345
1346                         UDF_SB_VAT(sb) = udf_iget(sb, ino);
1347                         if (!UDF_SB_VAT(sb))
1348                                 return 1;
1349
1350                         if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP15) {
1351                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1352                                         udf_ext0_offset(UDF_SB_VAT(sb));
1353                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries =
1354                                         (UDF_SB_VAT(sb)->i_size - 36) >> 2;
1355                         } else if (UDF_SB_PARTTYPE(sb, i) == UDF_VIRTUAL_MAP20) {
1356                                 struct buffer_head *bh = NULL;
1357                                 uint32_t pos;
1358
1359                                 pos = udf_block_map(UDF_SB_VAT(sb), 0);
1360                                 bh = sb_bread(sb, pos);
1361                                 if (!bh)
1362                                         return 1;
1363                                 UDF_SB_TYPEVIRT(sb, i).s_start_offset =
1364                                         le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data +
1365                                                      udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
1366                                         udf_ext0_offset(UDF_SB_VAT(sb));
1367                                 UDF_SB_TYPEVIRT(sb, i).s_num_entries = (UDF_SB_VAT(sb)->i_size -
1368                                                                         UDF_SB_TYPEVIRT(sb, i).s_start_offset) >> 2;
1369                                 brelse(bh);
1370                         }
1371                         UDF_SB_PARTROOT(sb, i) = udf_get_pblock(sb, 0, i, 0);
1372                         UDF_SB_PARTLEN(sb, i) = UDF_SB_PARTLEN(sb, ino.partitionReferenceNum);
1373                 }
1374         }
1375         return 0;
1376 }
1377
1378 static void udf_open_lvid(struct super_block *sb)
1379 {
1380         if (UDF_SB_LVIDBH(sb)) {
1381                 int i;
1382                 kernel_timestamp cpu_time;
1383
1384                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1385                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1386                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1387                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1388                 UDF_SB_LVID(sb)->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1389
1390                 UDF_SB_LVID(sb)->descTag.descCRC = cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1391                                                                        le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1392
1393                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1394                 for (i = 0; i < 16; i++)
1395                         if (i != 4)
1396                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1397                                         ((uint8_t *) &(UDF_SB_LVID(sb)->descTag))[i];
1398
1399                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1400         }
1401 }
1402
1403 static void udf_close_lvid(struct super_block *sb)
1404 {
1405         kernel_timestamp cpu_time;
1406         int i;
1407
1408         if (UDF_SB_LVIDBH(sb) &&
1409             UDF_SB_LVID(sb)->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1410                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1411                 UDF_SB_LVIDIU(sb)->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1412                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1413                         UDF_SB_LVID(sb)->recordingDateAndTime = cpu_to_lets(cpu_time);
1414                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev))
1415                         UDF_SB_LVIDIU(sb)->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1416                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev))
1417                         UDF_SB_LVIDIU(sb)->minUDFReadRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1418                 if (UDF_SB_UDFREV(sb) > le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev))
1419                         UDF_SB_LVIDIU(sb)->minUDFWriteRev = cpu_to_le16(UDF_SB_UDFREV(sb));
1420                 UDF_SB_LVID(sb)->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1421
1422                 UDF_SB_LVID(sb)->descTag.descCRC =
1423                         cpu_to_le16(udf_crc((char *)UDF_SB_LVID(sb) + sizeof(tag),
1424                                             le16_to_cpu(UDF_SB_LVID(sb)->descTag.descCRCLength), 0));
1425
1426                 UDF_SB_LVID(sb)->descTag.tagChecksum = 0;
1427                 for (i = 0; i < 16; i++)
1428                         if (i != 4)
1429                                 UDF_SB_LVID(sb)->descTag.tagChecksum +=
1430                                         ((uint8_t *)&(UDF_SB_LVID(sb)->descTag))[i];
1431
1432                 mark_buffer_dirty(UDF_SB_LVIDBH(sb));
1433         }
1434 }
1435
1436 /*
1437  * udf_read_super
1438  *
1439  * PURPOSE
1440  *      Complete the specified super block.
1441  *
1442  * PRE-CONDITIONS
1443  *      sb                      Pointer to superblock to complete - never NULL.
1444  *      sb->s_dev               Device to read suberblock from.
1445  *      options                 Pointer to mount options.
1446  *      silent                  Silent flag.
1447  *
1448  * HISTORY
1449  *      July 1, 1997 - Andrew E. Mileski
1450  *      Written, tested, and released.
1451  */
1452 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1453 {
1454         int i;
1455         struct inode *inode = NULL;
1456         struct udf_options uopt;
1457         kernel_lb_addr rootdir, fileset;
1458         struct udf_sb_info *sbi;
1459
1460         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1461         uopt.uid = -1;
1462         uopt.gid = -1;
1463         uopt.umask = 0;
1464
1465         sbi = kmalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1466         if (!sbi)
1467                 return -ENOMEM;
1468
1469         sb->s_fs_info = sbi;
1470         memset(UDF_SB(sb), 0x00, sizeof(struct udf_sb_info));
1471
1472         mutex_init(&sbi->s_alloc_mutex);
1473
1474         if (!udf_parse_options((char *)options, &uopt))
1475                 goto error_out;
1476
1477         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1478             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1479                 udf_error(sb, "udf_read_super",
1480                           "utf8 cannot be combined with iocharset\n");
1481                 goto error_out;
1482         }
1483 #ifdef CONFIG_UDF_NLS
1484         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1485                 uopt.nls_map = load_nls_default();
1486                 if (!uopt.nls_map)
1487                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1488                 else
1489                         udf_debug("Using default NLS map\n");
1490         }
1491 #endif
1492         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1493                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1494
1495         fileset.logicalBlockNum = 0xFFFFFFFF;
1496         fileset.partitionReferenceNum = 0xFFFF;
1497
1498         UDF_SB(sb)->s_flags = uopt.flags;
1499         UDF_SB(sb)->s_uid = uopt.uid;
1500         UDF_SB(sb)->s_gid = uopt.gid;
1501         UDF_SB(sb)->s_umask = uopt.umask;
1502         UDF_SB(sb)->s_nls_map = uopt.nls_map;
1503
1504         /* Set the block size for all transfers */
1505         if (!udf_set_blocksize(sb, uopt.blocksize))
1506                 goto error_out;
1507
1508         if (uopt.session == 0xFFFFFFFF)
1509                 UDF_SB_SESSION(sb) = udf_get_last_session(sb);
1510         else
1511                 UDF_SB_SESSION(sb) = uopt.session;
1512
1513         udf_debug("Multi-session=%d\n", UDF_SB_SESSION(sb));
1514
1515         UDF_SB_LASTBLOCK(sb) = uopt.lastblock;
1516         UDF_SB_ANCHOR(sb)[0] = UDF_SB_ANCHOR(sb)[1] = 0;
1517         UDF_SB_ANCHOR(sb)[2] = uopt.anchor;
1518         UDF_SB_ANCHOR(sb)[3] = 256;
1519
1520         if (udf_check_valid(sb, uopt.novrs, silent)) {
1521                 /* read volume recognition sequences */
1522                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1523                 goto error_out;
1524         }
1525
1526         udf_find_anchor(sb);
1527
1528         /* Fill in the rest of the superblock */
1529         sb->s_op = &udf_sb_ops;
1530         sb->dq_op = NULL;
1531         sb->s_dirt = 0;
1532         sb->s_magic = UDF_SUPER_MAGIC;
1533         sb->s_time_gran = 1000;
1534
1535         if (udf_load_partition(sb, &fileset)) {
1536                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1537                 goto error_out;
1538         }
1539
1540         udf_debug("Lastblock=%d\n", UDF_SB_LASTBLOCK(sb));
1541
1542         if (UDF_SB_LVIDBH(sb)) {
1543                 uint16_t minUDFReadRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev);
1544                 uint16_t minUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
1545                 /* uint16_t maxUDFWriteRev = le16_to_cpu(UDF_SB_LVIDIU(sb)->maxUDFWriteRev); */
1546
1547                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1548                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x (max is %x)\n",
1549                                le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFReadRev),
1550                                UDF_MAX_READ_VERSION);
1551                         goto error_out;
1552                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) {
1553                         sb->s_flags |= MS_RDONLY;
1554                 }
1555
1556                 UDF_SB_UDFREV(sb) = minUDFWriteRev;
1557
1558                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1559                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1560                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1561                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1562         }
1563
1564         if (!UDF_SB_NUMPARTS(sb)) {
1565                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1566                 goto error_out;
1567         }
1568
1569         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY) {
1570                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; forcing readonly mount\n");
1571                 sb->s_flags |= MS_RDONLY;
1572         }
1573
1574         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1575                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1576                 goto error_out;
1577         }
1578
1579         if (!silent) {
1580                 kernel_timestamp ts;
1581                 udf_time_to_stamp(&ts, UDF_SB_RECORDTIME(sb));
1582                 udf_info("UDF %s (%s) Mounting volume '%s', "
1583                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1584                          UDFFS_VERSION, UDFFS_DATE,
1585                          UDF_SB_VOLIDENT(sb), ts.year, ts.month, ts.day, ts.hour, ts.minute,
1586                          ts.typeAndTimezone);
1587         }
1588         if (!(sb->s_flags & MS_RDONLY))
1589                 udf_open_lvid(sb);
1590
1591         /* Assign the root inode */
1592         /* assign inodes by physical block number */
1593         /* perhaps it's not extensible enough, but for now ... */
1594         inode = udf_iget(sb, rootdir);
1595         if (!inode) {
1596                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, partition=%d\n",
1597                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1598                 goto error_out;
1599         }
1600
1601         /* Allocate a dentry for the root inode */
1602         sb->s_root = d_alloc_root(inode);
1603         if (!sb->s_root) {
1604                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1605                 iput(inode);
1606                 goto error_out;
1607         }
1608         sb->s_maxbytes = MAX_LFS_FILESIZE;
1609         return 0;
1610
1611 error_out:
1612         if (UDF_SB_VAT(sb))
1613                 iput(UDF_SB_VAT(sb));
1614         if (UDF_SB_NUMPARTS(sb)) {
1615                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1616                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1617                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1618                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1619                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1620                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_uspace);
1621                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1622                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_fspace);
1623                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1624                         for (i = 0; i < 4; i++)
1625                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1626                 }
1627         }
1628 #ifdef CONFIG_UDF_NLS
1629         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1630                 unload_nls(UDF_SB(sb)->s_nls_map);
1631 #endif
1632         if (!(sb->s_flags & MS_RDONLY))
1633                 udf_close_lvid(sb);
1634         brelse(UDF_SB_LVIDBH(sb));
1635         UDF_SB_FREE(sb);
1636         kfree(sbi);
1637         sb->s_fs_info = NULL;
1638
1639         return -EINVAL;
1640 }
1641
1642 void udf_error(struct super_block *sb, const char *function,
1643                const char *fmt, ...)
1644 {
1645         va_list args;
1646
1647         if (!(sb->s_flags & MS_RDONLY)) {
1648                 /* mark sb error */
1649                 sb->s_dirt = 1;
1650         }
1651         va_start(args, fmt);
1652         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1653         va_end(args);
1654         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1655                 sb->s_id, function, error_buf);
1656 }
1657
1658 void udf_warning(struct super_block *sb, const char *function,
1659                  const char *fmt, ...)
1660 {
1661         va_list args;
1662
1663         va_start(args, fmt);
1664         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1665         va_end(args);
1666         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1667                sb->s_id, function, error_buf);
1668 }
1669
1670 /*
1671  * udf_put_super
1672  *
1673  * PURPOSE
1674  *      Prepare for destruction of the superblock.
1675  *
1676  * DESCRIPTION
1677  *      Called before the filesystem is unmounted.
1678  *
1679  * HISTORY
1680  *      July 1, 1997 - Andrew E. Mileski
1681  *      Written, tested, and released.
1682  */
1683 static void udf_put_super(struct super_block *sb)
1684 {
1685         int i;
1686
1687         if (UDF_SB_VAT(sb))
1688                 iput(UDF_SB_VAT(sb));
1689         if (UDF_SB_NUMPARTS(sb)) {
1690                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE)
1691                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1692                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE)
1693                         iput(UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1694                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP)
1695                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_uspace);
1696                 if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP)
1697                         UDF_SB_FREE_BITMAP(sb, UDF_SB_PARTITION(sb), s_fspace);
1698                 if (UDF_SB_PARTTYPE(sb, UDF_SB_PARTITION(sb)) == UDF_SPARABLE_MAP15) {
1699                         for (i = 0; i < 4; i++)
1700                                 brelse(UDF_SB_TYPESPAR(sb, UDF_SB_PARTITION(sb)).s_spar_map[i]);
1701                 }
1702         }
1703 #ifdef CONFIG_UDF_NLS
1704         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1705                 unload_nls(UDF_SB(sb)->s_nls_map);
1706 #endif
1707         if (!(sb->s_flags & MS_RDONLY))
1708                 udf_close_lvid(sb);
1709         brelse(UDF_SB_LVIDBH(sb));
1710         UDF_SB_FREE(sb);
1711         kfree(sb->s_fs_info);
1712         sb->s_fs_info = NULL;
1713 }
1714
1715 /*
1716  * udf_stat_fs
1717  *
1718  * PURPOSE
1719  *      Return info about the filesystem.
1720  *
1721  * DESCRIPTION
1722  *      Called by sys_statfs()
1723  *
1724  * HISTORY
1725  *      July 1, 1997 - Andrew E. Mileski
1726  *      Written, tested, and released.
1727  */
1728 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1729 {
1730         struct super_block *sb = dentry->d_sb;
1731
1732         buf->f_type = UDF_SUPER_MAGIC;
1733         buf->f_bsize = sb->s_blocksize;
1734         buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
1735         buf->f_bfree = udf_count_free(sb);
1736         buf->f_bavail = buf->f_bfree;
1737         buf->f_files = (UDF_SB_LVIDBH(sb) ?
1738                         (le32_to_cpu(UDF_SB_LVIDIU(sb)->numFiles) +
1739                          le32_to_cpu(UDF_SB_LVIDIU(sb)->numDirs)) : 0) + buf->f_bfree;
1740         buf->f_ffree = buf->f_bfree;
1741         /* __kernel_fsid_t f_fsid */
1742         buf->f_namelen = UDF_NAME_LEN - 2;
1743
1744         return 0;
1745 }
1746
1747 static unsigned char udf_bitmap_lookup[16] = {
1748         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1749 };
1750
1751 static unsigned int udf_count_free_bitmap(struct super_block *sb, struct udf_bitmap *bitmap)
1752 {
1753         struct buffer_head *bh = NULL;
1754         unsigned int accum = 0;
1755         int index;
1756         int block = 0, newblock;
1757         kernel_lb_addr loc;
1758         uint32_t bytes;
1759         uint8_t value;
1760         uint8_t *ptr;
1761         uint16_t ident;
1762         struct spaceBitmapDesc *bm;
1763
1764         lock_kernel();
1765
1766         loc.logicalBlockNum = bitmap->s_extPosition;
1767         loc.partitionReferenceNum = UDF_SB_PARTITION(sb);
1768         bh = udf_read_ptagged(sb, loc, 0, &ident);
1769
1770         if (!bh) {
1771                 printk(KERN_ERR "udf: udf_count_free failed\n");
1772                 goto out;
1773         } else if (ident != TAG_IDENT_SBD) {
1774                 brelse(bh);
1775                 printk(KERN_ERR "udf: udf_count_free failed\n");
1776                 goto out;
1777         }
1778
1779         bm = (struct spaceBitmapDesc *)bh->b_data;
1780         bytes = le32_to_cpu(bm->numOfBytes);
1781         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
1782         ptr = (uint8_t *)bh->b_data;
1783
1784         while (bytes > 0) {
1785                 while ((bytes > 0) && (index < sb->s_blocksize)) {
1786                         value = ptr[index];
1787                         accum += udf_bitmap_lookup[value & 0x0f];
1788                         accum += udf_bitmap_lookup[value >> 4];
1789                         index++;
1790                         bytes--;
1791                 }
1792                 if (bytes) {
1793                         brelse(bh);
1794                         newblock = udf_get_lb_pblock(sb, loc, ++block);
1795                         bh = udf_tread(sb, newblock);
1796                         if (!bh) {
1797                                 udf_debug("read failed\n");
1798                                 goto out;
1799                         }
1800                         index = 0;
1801                         ptr = (uint8_t *)bh->b_data;
1802                 }
1803         }
1804         brelse(bh);
1805
1806 out:
1807         unlock_kernel();
1808
1809         return accum;
1810 }
1811
1812 static unsigned int udf_count_free_table(struct super_block *sb, struct inode *table)
1813 {
1814         unsigned int accum = 0;
1815         uint32_t elen;
1816         kernel_lb_addr eloc;
1817         int8_t etype;
1818         struct extent_position epos;
1819
1820         lock_kernel();
1821
1822         epos.block = UDF_I_LOCATION(table);
1823         epos.offset = sizeof(struct unallocSpaceEntry);
1824         epos.bh = NULL;
1825
1826         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
1827                 accum += (elen >> table->i_sb->s_blocksize_bits);
1828
1829         brelse(epos.bh);
1830
1831         unlock_kernel();
1832
1833         return accum;
1834 }
1835
1836 static unsigned int udf_count_free(struct super_block *sb)
1837 {
1838         unsigned int accum = 0;
1839
1840         if (UDF_SB_LVIDBH(sb)) {
1841                 if (le32_to_cpu(UDF_SB_LVID(sb)->numOfPartitions) > UDF_SB_PARTITION(sb)) {
1842                         accum = le32_to_cpu(UDF_SB_LVID(sb)->freeSpaceTable[UDF_SB_PARTITION(sb)]);
1843                         if (accum == 0xFFFFFFFF)
1844                                 accum = 0;
1845                 }
1846         }
1847
1848         if (accum)
1849                 return accum;
1850
1851         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_BITMAP) {
1852                 accum += udf_count_free_bitmap(sb,
1853                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_bitmap);
1854         }
1855         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_BITMAP) {
1856                 accum += udf_count_free_bitmap(sb,
1857                                                UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_bitmap);
1858         }
1859         if (accum)
1860                 return accum;
1861
1862         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_UNALLOC_TABLE) {
1863                 accum += udf_count_free_table(sb,
1864                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_uspace.s_table);
1865         }
1866         if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_FREED_TABLE) {
1867                 accum += udf_count_free_table(sb,
1868                                               UDF_SB_PARTMAPS(sb)[UDF_SB_PARTITION(sb)].s_fspace.s_table);
1869         }
1870
1871         return accum;
1872 }