udf: improve readability of udf_load_partition
[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 <linux/errno.h>
56 #include <asm/byteorder.h>
57
58 #include <linux/udf_fs.h>
59 #include "udf_sb.h"
60 #include "udf_i.h"
61
62 #include <linux/init.h>
63 #include <asm/uaccess.h>
64
65 #define VDS_POS_PRIMARY_VOL_DESC        0
66 #define VDS_POS_UNALLOC_SPACE_DESC      1
67 #define VDS_POS_LOGICAL_VOL_DESC        2
68 #define VDS_POS_PARTITION_DESC          3
69 #define VDS_POS_IMP_USE_VOL_DESC        4
70 #define VDS_POS_VOL_DESC_PTR            5
71 #define VDS_POS_TERMINATING_DESC        6
72 #define VDS_POS_LENGTH                  7
73
74 static char error_buf[1024];
75
76 /* These are the "meat" - everything else is stuffing */
77 static int udf_fill_super(struct super_block *, void *, int);
78 static void udf_put_super(struct super_block *);
79 static void udf_write_super(struct super_block *);
80 static int udf_remount_fs(struct super_block *, int *, char *);
81 static int udf_check_valid(struct super_block *, int, int);
82 static int udf_vrs(struct super_block *sb, int silent);
83 static int udf_load_partition(struct super_block *, kernel_lb_addr *);
84 static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
85                                kernel_lb_addr *);
86 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
87 static void udf_find_anchor(struct super_block *);
88 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
89                             kernel_lb_addr *);
90 static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
92                              kernel_lb_addr *);
93 static int udf_load_partdesc(struct super_block *, struct buffer_head *);
94 static void udf_open_lvid(struct super_block *);
95 static void udf_close_lvid(struct super_block *);
96 static unsigned int udf_count_free(struct super_block *);
97 static int udf_statfs(struct dentry *, struct kstatfs *);
98
99 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
100 {
101         struct logicalVolIntegrityDesc *lvid =
102                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
103         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
104         __u32 offset = number_of_partitions * 2 *
105                                 sizeof(uint32_t)/sizeof(uint8_t);
106         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
107 }
108
109 /* UDF filesystem type */
110 static int udf_get_sb(struct file_system_type *fs_type,
111                       int flags, const char *dev_name, void *data,
112                       struct vfsmount *mnt)
113 {
114         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
115 }
116
117 static struct file_system_type udf_fstype = {
118         .owner          = THIS_MODULE,
119         .name           = "udf",
120         .get_sb         = udf_get_sb,
121         .kill_sb        = kill_block_super,
122         .fs_flags       = FS_REQUIRES_DEV,
123 };
124
125 static struct kmem_cache *udf_inode_cachep;
126
127 static struct inode *udf_alloc_inode(struct super_block *sb)
128 {
129         struct udf_inode_info *ei;
130         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
131         if (!ei)
132                 return NULL;
133
134         ei->i_unique = 0;
135         ei->i_lenExtents = 0;
136         ei->i_next_alloc_block = 0;
137         ei->i_next_alloc_goal = 0;
138         ei->i_strat4096 = 0;
139
140         return &ei->vfs_inode;
141 }
142
143 static void udf_destroy_inode(struct inode *inode)
144 {
145         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
146 }
147
148 static void init_once(struct kmem_cache *cachep, void *foo)
149 {
150         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
151
152         ei->i_ext.i_data = NULL;
153         inode_init_once(&ei->vfs_inode);
154 }
155
156 static int init_inodecache(void)
157 {
158         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
159                                              sizeof(struct udf_inode_info),
160                                              0, (SLAB_RECLAIM_ACCOUNT |
161                                                  SLAB_MEM_SPREAD),
162                                              init_once);
163         if (!udf_inode_cachep)
164                 return -ENOMEM;
165         return 0;
166 }
167
168 static void destroy_inodecache(void)
169 {
170         kmem_cache_destroy(udf_inode_cachep);
171 }
172
173 /* Superblock operations */
174 static const struct super_operations udf_sb_ops = {
175         .alloc_inode    = udf_alloc_inode,
176         .destroy_inode  = udf_destroy_inode,
177         .write_inode    = udf_write_inode,
178         .delete_inode   = udf_delete_inode,
179         .clear_inode    = udf_clear_inode,
180         .put_super      = udf_put_super,
181         .write_super    = udf_write_super,
182         .statfs         = udf_statfs,
183         .remount_fs     = udf_remount_fs,
184 };
185
186 struct udf_options {
187         unsigned char novrs;
188         unsigned int blocksize;
189         unsigned int session;
190         unsigned int lastblock;
191         unsigned int anchor;
192         unsigned int volume;
193         unsigned short partition;
194         unsigned int fileset;
195         unsigned int rootdir;
196         unsigned int flags;
197         mode_t umask;
198         gid_t gid;
199         uid_t uid;
200         struct nls_table *nls_map;
201 };
202
203 static int __init init_udf_fs(void)
204 {
205         int err;
206
207         err = init_inodecache();
208         if (err)
209                 goto out1;
210         err = register_filesystem(&udf_fstype);
211         if (err)
212                 goto out;
213
214         return 0;
215
216 out:
217         destroy_inodecache();
218
219 out1:
220         return err;
221 }
222
223 static void __exit exit_udf_fs(void)
224 {
225         unregister_filesystem(&udf_fstype);
226         destroy_inodecache();
227 }
228
229 module_init(init_udf_fs)
230 module_exit(exit_udf_fs)
231
232 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
233 {
234         struct udf_sb_info *sbi = UDF_SB(sb);
235
236         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
237                                   GFP_KERNEL);
238         if (!sbi->s_partmaps) {
239                 udf_error(sb, __FUNCTION__,
240                           "Unable to allocate space for %d partition maps",
241                           count);
242                 sbi->s_partitions = 0;
243                 return -ENOMEM;
244         }
245
246         sbi->s_partitions = count;
247         return 0;
248 }
249
250 /*
251  * udf_parse_options
252  *
253  * PURPOSE
254  *      Parse mount options.
255  *
256  * DESCRIPTION
257  *      The following mount options are supported:
258  *
259  *      gid=            Set the default group.
260  *      umask=          Set the default umask.
261  *      uid=            Set the default user.
262  *      bs=             Set the block size.
263  *      unhide          Show otherwise hidden files.
264  *      undelete        Show deleted files in lists.
265  *      adinicb         Embed data in the inode (default)
266  *      noadinicb       Don't embed data in the inode
267  *      shortad         Use short ad's
268  *      longad          Use long ad's (default)
269  *      nostrict        Unset strict conformance
270  *      iocharset=      Set the NLS character set
271  *
272  *      The remaining are for debugging and disaster recovery:
273  *
274  *      novrs           Skip volume sequence recognition
275  *
276  *      The following expect a offset from 0.
277  *
278  *      session=        Set the CDROM session (default= last session)
279  *      anchor=         Override standard anchor location. (default= 256)
280  *      volume=         Override the VolumeDesc location. (unused)
281  *      partition=      Override the PartitionDesc location. (unused)
282  *      lastblock=      Set the last block of the filesystem/
283  *
284  *      The following expect a offset from the partition root.
285  *
286  *      fileset=        Override the fileset block location. (unused)
287  *      rootdir=        Override the root directory location. (unused)
288  *              WARNING: overriding the rootdir to a non-directory may
289  *              yield highly unpredictable results.
290  *
291  * PRE-CONDITIONS
292  *      options         Pointer to mount options string.
293  *      uopts           Pointer to mount options variable.
294  *
295  * POST-CONDITIONS
296  *      <return>        1       Mount options parsed okay.
297  *      <return>        0       Error parsing mount options.
298  *
299  * HISTORY
300  *      July 1, 1997 - Andrew E. Mileski
301  *      Written, tested, and released.
302  */
303
304 enum {
305         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
306         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
307         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
308         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
309         Opt_rootdir, Opt_utf8, Opt_iocharset,
310         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
311 };
312
313 static match_table_t tokens = {
314         {Opt_novrs,     "novrs"},
315         {Opt_nostrict,  "nostrict"},
316         {Opt_bs,        "bs=%u"},
317         {Opt_unhide,    "unhide"},
318         {Opt_undelete,  "undelete"},
319         {Opt_noadinicb, "noadinicb"},
320         {Opt_adinicb,   "adinicb"},
321         {Opt_shortad,   "shortad"},
322         {Opt_longad,    "longad"},
323         {Opt_uforget,   "uid=forget"},
324         {Opt_uignore,   "uid=ignore"},
325         {Opt_gforget,   "gid=forget"},
326         {Opt_gignore,   "gid=ignore"},
327         {Opt_gid,       "gid=%u"},
328         {Opt_uid,       "uid=%u"},
329         {Opt_umask,     "umask=%o"},
330         {Opt_session,   "session=%u"},
331         {Opt_lastblock, "lastblock=%u"},
332         {Opt_anchor,    "anchor=%u"},
333         {Opt_volume,    "volume=%u"},
334         {Opt_partition, "partition=%u"},
335         {Opt_fileset,   "fileset=%u"},
336         {Opt_rootdir,   "rootdir=%u"},
337         {Opt_utf8,      "utf8"},
338         {Opt_iocharset, "iocharset=%s"},
339         {Opt_err,       NULL}
340 };
341
342 static int udf_parse_options(char *options, struct udf_options *uopt)
343 {
344         char *p;
345         int option;
346
347         uopt->novrs = 0;
348         uopt->blocksize = 2048;
349         uopt->partition = 0xFFFF;
350         uopt->session = 0xFFFFFFFF;
351         uopt->lastblock = 0;
352         uopt->anchor = 0;
353         uopt->volume = 0xFFFFFFFF;
354         uopt->rootdir = 0xFFFFFFFF;
355         uopt->fileset = 0xFFFFFFFF;
356         uopt->nls_map = NULL;
357
358         if (!options)
359                 return 1;
360
361         while ((p = strsep(&options, ",")) != NULL) {
362                 substring_t args[MAX_OPT_ARGS];
363                 int token;
364                 if (!*p)
365                         continue;
366
367                 token = match_token(p, tokens, args);
368                 switch (token) {
369                 case Opt_novrs:
370                         uopt->novrs = 1;
371                 case Opt_bs:
372                         if (match_int(&args[0], &option))
373                                 return 0;
374                         uopt->blocksize = option;
375                         break;
376                 case Opt_unhide:
377                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
378                         break;
379                 case Opt_undelete:
380                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
381                         break;
382                 case Opt_noadinicb:
383                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
384                         break;
385                 case Opt_adinicb:
386                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
387                         break;
388                 case Opt_shortad:
389                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
390                         break;
391                 case Opt_longad:
392                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
393                         break;
394                 case Opt_gid:
395                         if (match_int(args, &option))
396                                 return 0;
397                         uopt->gid = option;
398                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
399                         break;
400                 case Opt_uid:
401                         if (match_int(args, &option))
402                                 return 0;
403                         uopt->uid = option;
404                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
405                         break;
406                 case Opt_umask:
407                         if (match_octal(args, &option))
408                                 return 0;
409                         uopt->umask = option;
410                         break;
411                 case Opt_nostrict:
412                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
413                         break;
414                 case Opt_session:
415                         if (match_int(args, &option))
416                                 return 0;
417                         uopt->session = option;
418                         break;
419                 case Opt_lastblock:
420                         if (match_int(args, &option))
421                                 return 0;
422                         uopt->lastblock = option;
423                         break;
424                 case Opt_anchor:
425                         if (match_int(args, &option))
426                                 return 0;
427                         uopt->anchor = option;
428                         break;
429                 case Opt_volume:
430                         if (match_int(args, &option))
431                                 return 0;
432                         uopt->volume = option;
433                         break;
434                 case Opt_partition:
435                         if (match_int(args, &option))
436                                 return 0;
437                         uopt->partition = option;
438                         break;
439                 case Opt_fileset:
440                         if (match_int(args, &option))
441                                 return 0;
442                         uopt->fileset = option;
443                         break;
444                 case Opt_rootdir:
445                         if (match_int(args, &option))
446                                 return 0;
447                         uopt->rootdir = option;
448                         break;
449                 case Opt_utf8:
450                         uopt->flags |= (1 << UDF_FLAG_UTF8);
451                         break;
452 #ifdef CONFIG_UDF_NLS
453                 case Opt_iocharset:
454                         uopt->nls_map = load_nls(args[0].from);
455                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
456                         break;
457 #endif
458                 case Opt_uignore:
459                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
460                         break;
461                 case Opt_uforget:
462                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
463                         break;
464                 case Opt_gignore:
465                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
466                         break;
467                 case Opt_gforget:
468                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
469                         break;
470                 default:
471                         printk(KERN_ERR "udf: bad mount option \"%s\" "
472                                "or missing value\n", p);
473                         return 0;
474                 }
475         }
476         return 1;
477 }
478
479 static void udf_write_super(struct super_block *sb)
480 {
481         lock_kernel();
482
483         if (!(sb->s_flags & MS_RDONLY))
484                 udf_open_lvid(sb);
485         sb->s_dirt = 0;
486
487         unlock_kernel();
488 }
489
490 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
491 {
492         struct udf_options uopt;
493         struct udf_sb_info *sbi = UDF_SB(sb);
494
495         uopt.flags = sbi->s_flags;
496         uopt.uid   = sbi->s_uid;
497         uopt.gid   = sbi->s_gid;
498         uopt.umask = sbi->s_umask;
499
500         if (!udf_parse_options(options, &uopt))
501                 return -EINVAL;
502
503         sbi->s_flags = uopt.flags;
504         sbi->s_uid   = uopt.uid;
505         sbi->s_gid   = uopt.gid;
506         sbi->s_umask = uopt.umask;
507
508         if (sbi->s_lvid_bh) {
509                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
510                 if (write_rev > UDF_MAX_WRITE_VERSION)
511                         *flags |= MS_RDONLY;
512         }
513
514         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
515                 return 0;
516         if (*flags & MS_RDONLY)
517                 udf_close_lvid(sb);
518         else
519                 udf_open_lvid(sb);
520
521         return 0;
522 }
523
524 /*
525  * udf_set_blocksize
526  *
527  * PURPOSE
528  *      Set the block size to be used in all transfers.
529  *
530  * DESCRIPTION
531  *      To allow room for a DMA transfer, it is best to guess big when unsure.
532  *      This routine picks 2048 bytes as the blocksize when guessing. This
533  *      should be adequate until devices with larger block sizes become common.
534  *
535  *      Note that the Linux kernel can currently only deal with blocksizes of
536  *      512, 1024, 2048, 4096, and 8192 bytes.
537  *
538  * PRE-CONDITIONS
539  *      sb                      Pointer to _locked_ superblock.
540  *
541  * POST-CONDITIONS
542  *      sb->s_blocksize         Blocksize.
543  *      sb->s_blocksize_bits    log2 of blocksize.
544  *      <return>        0       Blocksize is valid.
545  *      <return>        1       Blocksize is invalid.
546  *
547  * HISTORY
548  *      July 1, 1997 - Andrew E. Mileski
549  *      Written, tested, and released.
550  */
551 static int udf_set_blocksize(struct super_block *sb, int bsize)
552 {
553         if (!sb_min_blocksize(sb, bsize)) {
554                 udf_debug("Bad block size (%d)\n", bsize);
555                 printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
556                 return 0;
557         }
558
559         return sb->s_blocksize;
560 }
561
562 static int udf_vrs(struct super_block *sb, int silent)
563 {
564         struct volStructDesc *vsd = NULL;
565         int sector = 32768;
566         int sectorsize;
567         struct buffer_head *bh = NULL;
568         int iso9660 = 0;
569         int nsr02 = 0;
570         int nsr03 = 0;
571         struct udf_sb_info *sbi;
572
573         /* Block size must be a multiple of 512 */
574         if (sb->s_blocksize & 511)
575                 return 0;
576         sbi = UDF_SB(sb);
577
578         if (sb->s_blocksize < sizeof(struct volStructDesc))
579                 sectorsize = sizeof(struct volStructDesc);
580         else
581                 sectorsize = sb->s_blocksize;
582
583         sector += (sbi->s_session << sb->s_blocksize_bits);
584
585         udf_debug("Starting at sector %u (%ld byte sectors)\n",
586                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
587         /* Process the sequence (if applicable) */
588         for (; !nsr02 && !nsr03; sector += sectorsize) {
589                 /* Read a block */
590                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
591                 if (!bh)
592                         break;
593
594                 /* Look for ISO  descriptors */
595                 vsd = (struct volStructDesc *)(bh->b_data +
596                                               (sector & (sb->s_blocksize - 1)));
597
598                 if (vsd->stdIdent[0] == 0) {
599                         brelse(bh);
600                         break;
601                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
602                                     VSD_STD_ID_LEN)) {
603                         iso9660 = sector;
604                         switch (vsd->structType) {
605                         case 0:
606                                 udf_debug("ISO9660 Boot Record found\n");
607                                 break;
608                         case 1:
609                                 udf_debug("ISO9660 Primary Volume Descriptor "
610                                           "found\n");
611                                 break;
612                         case 2:
613                                 udf_debug("ISO9660 Supplementary Volume "
614                                           "Descriptor found\n");
615                                 break;
616                         case 3:
617                                 udf_debug("ISO9660 Volume Partition Descriptor "
618                                           "found\n");
619                                 break;
620                         case 255:
621                                 udf_debug("ISO9660 Volume Descriptor Set "
622                                           "Terminator found\n");
623                                 break;
624                         default:
625                                 udf_debug("ISO9660 VRS (%u) found\n",
626                                           vsd->structType);
627                                 break;
628                         }
629                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
630                                     VSD_STD_ID_LEN))
631                         ; /* nothing */
632                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
633                                     VSD_STD_ID_LEN)) {
634                         brelse(bh);
635                         break;
636                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
637                                     VSD_STD_ID_LEN))
638                         nsr02 = sector;
639                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
640                                     VSD_STD_ID_LEN))
641                         nsr03 = sector;
642                 brelse(bh);
643         }
644
645         if (nsr03)
646                 return nsr03;
647         else if (nsr02)
648                 return nsr02;
649         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
650                 return -1;
651         else
652                 return 0;
653 }
654
655 /*
656  * udf_find_anchor
657  *
658  * PURPOSE
659  *      Find an anchor volume descriptor.
660  *
661  * PRE-CONDITIONS
662  *      sb                      Pointer to _locked_ superblock.
663  *      lastblock               Last block on media.
664  *
665  * POST-CONDITIONS
666  *      <return>                1 if not found, 0 if ok
667  *
668  * HISTORY
669  *      July 1, 1997 - Andrew E. Mileski
670  *      Written, tested, and released.
671  */
672 static void udf_find_anchor(struct super_block *sb)
673 {
674         int lastblock;
675         struct buffer_head *bh = NULL;
676         uint16_t ident;
677         uint32_t location;
678         int i;
679         struct udf_sb_info *sbi;
680
681         sbi = UDF_SB(sb);
682         lastblock = sbi->s_last_block;
683
684         if (lastblock) {
685                 int varlastblock = udf_variable_to_fixed(lastblock);
686                 int last[] =  { lastblock, lastblock - 2,
687                                 lastblock - 150, lastblock - 152,
688                                 varlastblock, varlastblock - 2,
689                                 varlastblock - 150, varlastblock - 152 };
690
691                 lastblock = 0;
692
693                 /* Search for an anchor volume descriptor pointer */
694
695                 /*  according to spec, anchor is in either:
696                  *     block 256
697                  *     lastblock-256
698                  *     lastblock
699                  *  however, if the disc isn't closed, it could be 512 */
700
701                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
702                         ident = location = 0;
703                         if (last[i] >= 0) {
704                                 bh = sb_bread(sb, last[i]);
705                                 if (bh) {
706                                         tag *t = (tag *)bh->b_data;
707                                         ident = le16_to_cpu(t->tagIdent);
708                                         location = le32_to_cpu(t->tagLocation);
709                                         brelse(bh);
710                                 }
711                         }
712
713                         if (ident == TAG_IDENT_AVDP) {
714                                 if (location == last[i] - sbi->s_session) {
715                                         lastblock = last[i] - sbi->s_session;
716                                         sbi->s_anchor[0] = lastblock;
717                                         sbi->s_anchor[1] = lastblock - 256;
718                                 } else if (location ==
719                                                 udf_variable_to_fixed(last[i]) -
720                                                         sbi->s_session) {
721                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
722                                         lastblock =
723                                                 udf_variable_to_fixed(last[i]) -
724                                                         sbi->s_session;
725                                         sbi->s_anchor[0] = lastblock;
726                                         sbi->s_anchor[1] = lastblock - 256 -
727                                                                 sbi->s_session;
728                                 } else {
729                                         udf_debug("Anchor found at block %d, "
730                                                   "location mismatch %d.\n",
731                                                   last[i], location);
732                                 }
733                         } else if (ident == TAG_IDENT_FE ||
734                                         ident == TAG_IDENT_EFE) {
735                                 lastblock = last[i];
736                                 sbi->s_anchor[3] = 512;
737                         } else {
738                                 ident = location = 0;
739                                 if (last[i] >= 256) {
740                                         bh = sb_bread(sb, last[i] - 256);
741                                         if (bh) {
742                                                 tag *t = (tag *)bh->b_data;
743                                                 ident = le16_to_cpu(
744                                                                 t->tagIdent);
745                                                 location = le32_to_cpu(
746                                                                 t->tagLocation);
747                                                 brelse(bh);
748                                         }
749                                 }
750
751                                 if (ident == TAG_IDENT_AVDP &&
752                                     location == last[i] - 256 -
753                                                 sbi->s_session) {
754                                         lastblock = last[i];
755                                         sbi->s_anchor[1] = last[i] - 256;
756                                 } else {
757                                         ident = location = 0;
758                                         if (last[i] >= 312 + sbi->s_session) {
759                                                 bh = sb_bread(sb,
760                                                                 last[i] - 312 -
761                                                                 sbi->s_session);
762                                                 if (bh) {
763                                                         tag *t = (tag *)
764                                                                  bh->b_data;
765                                                         ident = le16_to_cpu(
766                                                                 t->tagIdent);
767                                                         location = le32_to_cpu(
768                                                                 t->tagLocation);
769                                                         brelse(bh);
770                                                 }
771                                         }
772
773                                         if (ident == TAG_IDENT_AVDP &&
774                                             location == udf_variable_to_fixed(last[i]) - 256) {
775                                                 UDF_SET_FLAG(sb,
776                                                              UDF_FLAG_VARCONV);
777                                                 lastblock = udf_variable_to_fixed(last[i]);
778                                                 sbi->s_anchor[1] = lastblock - 256;
779                                         }
780                                 }
781                         }
782                 }
783         }
784
785         if (!lastblock) {
786                 /* We haven't found the lastblock. check 312 */
787                 bh = sb_bread(sb, 312 + sbi->s_session);
788                 if (bh) {
789                         tag *t = (tag *)bh->b_data;
790                         ident = le16_to_cpu(t->tagIdent);
791                         location = le32_to_cpu(t->tagLocation);
792                         brelse(bh);
793
794                         if (ident == TAG_IDENT_AVDP && location == 256)
795                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
796                 }
797         }
798
799         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
800                 if (sbi->s_anchor[i]) {
801                         bh = udf_read_tagged(sb, sbi->s_anchor[i],
802                                              sbi->s_anchor[i], &ident);
803                         if (!bh)
804                                 sbi->s_anchor[i] = 0;
805                         else {
806                                 brelse(bh);
807                                 if ((ident != TAG_IDENT_AVDP) &&
808                                     (i || (ident != TAG_IDENT_FE &&
809                                            ident != TAG_IDENT_EFE)))
810                                         sbi->s_anchor[i] = 0;
811                         }
812                 }
813         }
814
815         sbi->s_last_block = lastblock;
816 }
817
818 static int udf_find_fileset(struct super_block *sb,
819                             kernel_lb_addr *fileset,
820                             kernel_lb_addr *root)
821 {
822         struct buffer_head *bh = NULL;
823         long lastblock;
824         uint16_t ident;
825         struct udf_sb_info *sbi;
826
827         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
828             fileset->partitionReferenceNum != 0xFFFF) {
829                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
830
831                 if (!bh) {
832                         return 1;
833                 } else if (ident != TAG_IDENT_FSD) {
834                         brelse(bh);
835                         return 1;
836                 }
837
838         }
839
840         sbi = UDF_SB(sb);
841         if (!bh) {
842                 /* Search backwards through the partitions */
843                 kernel_lb_addr newfileset;
844
845 /* --> cvg: FIXME - is it reasonable? */
846                 return 1;
847
848                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
849                      (newfileset.partitionReferenceNum != 0xFFFF &&
850                       fileset->logicalBlockNum == 0xFFFFFFFF &&
851                       fileset->partitionReferenceNum == 0xFFFF);
852                      newfileset.partitionReferenceNum--) {
853                         lastblock = sbi->s_partmaps
854                                         [newfileset.partitionReferenceNum]
855                                                 .s_partition_len;
856                         newfileset.logicalBlockNum = 0;
857
858                         do {
859                                 bh = udf_read_ptagged(sb, newfileset, 0,
860                                                       &ident);
861                                 if (!bh) {
862                                         newfileset.logicalBlockNum++;
863                                         continue;
864                                 }
865
866                                 switch (ident) {
867                                 case TAG_IDENT_SBD:
868                                 {
869                                         struct spaceBitmapDesc *sp;
870                                         sp = (struct spaceBitmapDesc *)
871                                                                 bh->b_data;
872                                         newfileset.logicalBlockNum += 1 +
873                                                 ((le32_to_cpu(sp->numOfBytes) +
874                                                   sizeof(struct spaceBitmapDesc)
875                                                   - 1) >> sb->s_blocksize_bits);
876                                         brelse(bh);
877                                         break;
878                                 }
879                                 case TAG_IDENT_FSD:
880                                         *fileset = newfileset;
881                                         break;
882                                 default:
883                                         newfileset.logicalBlockNum++;
884                                         brelse(bh);
885                                         bh = NULL;
886                                         break;
887                                 }
888                         } while (newfileset.logicalBlockNum < lastblock &&
889                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
890                                  fileset->partitionReferenceNum == 0xFFFF);
891                 }
892         }
893
894         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
895              fileset->partitionReferenceNum != 0xFFFF) && bh) {
896                 udf_debug("Fileset at block=%d, partition=%d\n",
897                           fileset->logicalBlockNum,
898                           fileset->partitionReferenceNum);
899
900                 sbi->s_partition = fileset->partitionReferenceNum;
901                 udf_load_fileset(sb, bh, root);
902                 brelse(bh);
903                 return 0;
904         }
905         return 1;
906 }
907
908 static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
909 {
910         struct primaryVolDesc *pvoldesc;
911         time_t recording;
912         long recording_usec;
913         struct ustr instr;
914         struct ustr outstr;
915
916         pvoldesc = (struct primaryVolDesc *)bh->b_data;
917
918         if (udf_stamp_to_time(&recording, &recording_usec,
919                               lets_to_cpu(pvoldesc->recordingDateAndTime))) {
920                 kernel_timestamp ts;
921                 ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
922                 udf_debug("recording time %ld/%ld, %04u/%02u/%02u"
923                           " %02u:%02u (%x)\n",
924                           recording, recording_usec,
925                           ts.year, ts.month, ts.day, ts.hour,
926                           ts.minute, ts.typeAndTimezone);
927                 UDF_SB(sb)->s_record_time.tv_sec = recording;
928                 UDF_SB(sb)->s_record_time.tv_nsec = recording_usec * 1000;
929         }
930
931         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
932                 if (udf_CS0toUTF8(&outstr, &instr)) {
933                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
934                                 outstr.u_len > 31 ? 31 : outstr.u_len);
935                         udf_debug("volIdent[] = '%s'\n",
936                                         UDF_SB(sb)->s_volume_ident);
937                 }
938
939         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
940                 if (udf_CS0toUTF8(&outstr, &instr))
941                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
942 }
943
944 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
945                              kernel_lb_addr *root)
946 {
947         struct fileSetDesc *fset;
948
949         fset = (struct fileSetDesc *)bh->b_data;
950
951         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
952
953         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
954
955         udf_debug("Rootdir at block=%d, partition=%d\n",
956                   root->logicalBlockNum, root->partitionReferenceNum);
957 }
958
959 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
960 {
961         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
962         return (map->s_partition_len +
963                 (sizeof(struct spaceBitmapDesc) << 3) +
964                 (sb->s_blocksize * 8) - 1) /
965                 (sb->s_blocksize * 8);
966 }
967
968 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
969 {
970         struct udf_bitmap *bitmap;
971         int nr_groups;
972         int size;
973
974         nr_groups = udf_compute_nr_groups(sb, index);
975         size = sizeof(struct udf_bitmap) +
976                 (sizeof(struct buffer_head *) * nr_groups);
977
978         if (size <= PAGE_SIZE)
979                 bitmap = kmalloc(size, GFP_KERNEL);
980         else
981                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
982
983         if (bitmap == NULL) {
984                 udf_error(sb, __FUNCTION__,
985                           "Unable to allocate space for bitmap "
986                           "and %d buffer_head pointers", nr_groups);
987                 return NULL;
988         }
989
990         memset(bitmap, 0x00, size);
991         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
992         bitmap->s_nr_groups = nr_groups;
993         return bitmap;
994 }
995
996 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
997 {
998         struct partitionDesc *p;
999         int i;
1000         struct udf_part_map *map;
1001         struct udf_sb_info *sbi;
1002
1003         p = (struct partitionDesc *)bh->b_data;
1004         sbi = UDF_SB(sb);
1005
1006         for (i = 0; i < sbi->s_partitions; i++) {
1007                 map = &sbi->s_partmaps[i];
1008                 udf_debug("Searching map: (%d == %d)\n",
1009                           map->s_partition_num,
1010                           le16_to_cpu(p->partitionNumber));
1011                 if (map->s_partition_num ==
1012                                 le16_to_cpu(p->partitionNumber)) {
1013                         map->s_partition_len =
1014                                 le32_to_cpu(p->partitionLength); /* blocks */
1015                         map->s_partition_root =
1016                                 le32_to_cpu(p->partitionStartingLocation);
1017                         if (p->accessType ==
1018                                         cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1019                                 map->s_partition_flags |=
1020                                                 UDF_PART_FLAG_READ_ONLY;
1021                         if (p->accessType ==
1022                                         cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1023                                 map->s_partition_flags |=
1024                                                 UDF_PART_FLAG_WRITE_ONCE;
1025                         if (p->accessType ==
1026                                         cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1027                                 map->s_partition_flags |=
1028                                                 UDF_PART_FLAG_REWRITABLE;
1029                         if (p->accessType ==
1030                                     cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1031                                 map->s_partition_flags |=
1032                                                 UDF_PART_FLAG_OVERWRITABLE;
1033
1034                         if (!strcmp(p->partitionContents.ident,
1035                                     PD_PARTITION_CONTENTS_NSR02) ||
1036                             !strcmp(p->partitionContents.ident,
1037                                     PD_PARTITION_CONTENTS_NSR03)) {
1038                                 struct partitionHeaderDesc *phd;
1039
1040                                 phd = (struct partitionHeaderDesc *)
1041                                                 (p->partitionContentsUse);
1042                                 if (phd->unallocSpaceTable.extLength) {
1043                                         kernel_lb_addr loc = {
1044                                                 .logicalBlockNum = le32_to_cpu(phd->unallocSpaceTable.extPosition),
1045                                                 .partitionReferenceNum = i,
1046                                         };
1047
1048                                         map->s_uspace.s_table =
1049                                                 udf_iget(sb, loc);
1050                                         if (!map->s_uspace.s_table) {
1051                                                 udf_debug("cannot load unallocSpaceTable (part %d)\n", i);
1052                                                 return 1;
1053                                         }
1054                                         map->s_partition_flags |=
1055                                                 UDF_PART_FLAG_UNALLOC_TABLE;
1056                                         udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1057                                                   i, map->s_uspace.s_table->i_ino);
1058                                 }
1059                                 if (phd->unallocSpaceBitmap.extLength) {
1060                                         struct udf_bitmap *bitmap =
1061                                                 udf_sb_alloc_bitmap(sb, i);
1062                                         map->s_uspace.s_bitmap = bitmap;
1063                                         if (bitmap != NULL) {
1064                                                 bitmap->s_extLength =
1065                                                         le32_to_cpu(phd->unallocSpaceBitmap.extLength);
1066                                                 bitmap->s_extPosition =
1067                                                         le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
1068                                                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1069                                                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1070                                                           i, bitmap->s_extPosition);
1071                                         }
1072                                 }
1073                                 if (phd->partitionIntegrityTable.extLength)
1074                                         udf_debug("partitionIntegrityTable (part %d)\n", i);
1075                                 if (phd->freedSpaceTable.extLength) {
1076                                         kernel_lb_addr loc = {
1077                                                 .logicalBlockNum = le32_to_cpu(phd->freedSpaceTable.extPosition),
1078                                                 .partitionReferenceNum = i,
1079                                         };
1080
1081                                         map->s_fspace.s_table =
1082                                                 udf_iget(sb, loc);
1083                                         if (!map->s_fspace.s_table) {
1084                                                 udf_debug("cannot load freedSpaceTable (part %d)\n", i);
1085                                                 return 1;
1086                                         }
1087                                         map->s_partition_flags |=
1088                                                 UDF_PART_FLAG_FREED_TABLE;
1089                                         udf_debug("freedSpaceTable (part %d) @ %ld\n",
1090                                                   i, map->s_fspace.s_table->i_ino);
1091                                 }
1092                                 if (phd->freedSpaceBitmap.extLength) {
1093                                         struct udf_bitmap *bitmap =
1094                                                 udf_sb_alloc_bitmap(sb, i);
1095                                         map->s_fspace.s_bitmap = bitmap;
1096                                         if (bitmap != NULL) {
1097                                                 bitmap->s_extLength =
1098                                                         le32_to_cpu(phd->freedSpaceBitmap.extLength);
1099                                                 bitmap->s_extPosition =
1100                                                         le32_to_cpu(phd->freedSpaceBitmap.extPosition);
1101                                                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1102                                                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1103                                                           i, bitmap->s_extPosition);
1104                                         }
1105                                 }
1106                         }
1107                         break;
1108                 }
1109         }
1110         if (i == sbi->s_partitions)
1111                 udf_debug("Partition (%d) not found in partition map\n",
1112                           le16_to_cpu(p->partitionNumber));
1113         else
1114                 udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1115                           "block length %d\n",
1116                           le16_to_cpu(p->partitionNumber), i,
1117                           map->s_partition_type,
1118                           map->s_partition_root,
1119                           map->s_partition_len);
1120         return 0;
1121 }
1122
1123 static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
1124                                kernel_lb_addr *fileset)
1125 {
1126         struct logicalVolDesc *lvd;
1127         int i, j, offset;
1128         uint8_t type;
1129         struct udf_sb_info *sbi = UDF_SB(sb);
1130         struct genericPartitionMap *gpm;
1131
1132         lvd = (struct logicalVolDesc *)bh->b_data;
1133
1134         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1135         if (i != 0)
1136                 return i;
1137
1138         for (i = 0, offset = 0;
1139              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1140              i++, offset += gpm->partitionMapLength) {
1141                 struct udf_part_map *map = &sbi->s_partmaps[i];
1142                 gpm = (struct genericPartitionMap *)
1143                                 &(lvd->partitionMaps[offset]);
1144                 type = gpm->partitionMapType;
1145                 if (type == 1) {
1146                         struct genericPartitionMap1 *gpm1 =
1147                                 (struct genericPartitionMap1 *)gpm;
1148                         map->s_partition_type = UDF_TYPE1_MAP15;
1149                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1150                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1151                         map->s_partition_func = NULL;
1152                 } else if (type == 2) {
1153                         struct udfPartitionMap2 *upm2 =
1154                                                 (struct udfPartitionMap2 *)gpm;
1155                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1156                                                 strlen(UDF_ID_VIRTUAL))) {
1157                                 u16 suf =
1158                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1159                                                         identSuffix)[0]);
1160                                 if (suf == 0x0150) {
1161                                         map->s_partition_type =
1162                                                         UDF_VIRTUAL_MAP15;
1163                                         map->s_partition_func =
1164                                                         udf_get_pblock_virt15;
1165                                 } else if (suf == 0x0200) {
1166                                         map->s_partition_type =
1167                                                         UDF_VIRTUAL_MAP20;
1168                                         map->s_partition_func =
1169                                                         udf_get_pblock_virt20;
1170                                 }
1171                         } else if (!strncmp(upm2->partIdent.ident,
1172                                                 UDF_ID_SPARABLE,
1173                                                 strlen(UDF_ID_SPARABLE))) {
1174                                 uint32_t loc;
1175                                 uint16_t ident;
1176                                 struct sparingTable *st;
1177                                 struct sparablePartitionMap *spm =
1178                                         (struct sparablePartitionMap *)gpm;
1179
1180                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1181                                 map->s_type_specific.s_sparing.s_packet_len =
1182                                                 le16_to_cpu(spm->packetLength);
1183                                 for (j = 0; j < spm->numSparingTables; j++) {
1184                                         struct buffer_head *bh2;
1185
1186                                         loc = le32_to_cpu(
1187                                                 spm->locSparingTable[j]);
1188                                         bh2 = udf_read_tagged(sb, loc, loc,
1189                                                              &ident);
1190                                         map->s_type_specific.s_sparing.
1191                                                         s_spar_map[j] = bh2;
1192
1193                                         if (bh2 != NULL) {
1194                                                 st = (struct sparingTable *)
1195                                                                 bh2->b_data;
1196                                                 if (ident != 0 || strncmp(
1197                                                         st->sparingIdent.ident,
1198                                                         UDF_ID_SPARING,
1199                                                         strlen(UDF_ID_SPARING))) {
1200                                                         brelse(bh2);
1201                                                         map->s_type_specific.
1202                                                                 s_sparing.
1203                                                                 s_spar_map[j] =
1204                                                                         NULL;
1205                                                 }
1206                                         }
1207                                 }
1208                                 map->s_partition_func = udf_get_pblock_spar15;
1209                         } else {
1210                                 udf_debug("Unknown ident: %s\n",
1211                                           upm2->partIdent.ident);
1212                                 continue;
1213                         }
1214                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1215                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1216                 }
1217                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1218                           i, map->s_partition_num, type,
1219                           map->s_volumeseqnum);
1220         }
1221
1222         if (fileset) {
1223                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1224
1225                 *fileset = lelb_to_cpu(la->extLocation);
1226                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1227                           "partition=%d\n", fileset->logicalBlockNum,
1228                           fileset->partitionReferenceNum);
1229         }
1230         if (lvd->integritySeqExt.extLength)
1231                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1232
1233         return 0;
1234 }
1235
1236 /*
1237  * udf_load_logicalvolint
1238  *
1239  */
1240 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1241 {
1242         struct buffer_head *bh = NULL;
1243         uint16_t ident;
1244         struct udf_sb_info *sbi = UDF_SB(sb);
1245         struct logicalVolIntegrityDesc *lvid;
1246
1247         while (loc.extLength > 0 &&
1248                (bh = udf_read_tagged(sb, loc.extLocation,
1249                                      loc.extLocation, &ident)) &&
1250                ident == TAG_IDENT_LVID) {
1251                 sbi->s_lvid_bh = bh;
1252                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1253
1254                 if (lvid->nextIntegrityExt.extLength)
1255                         udf_load_logicalvolint(sb,
1256                                 leea_to_cpu(lvid->nextIntegrityExt));
1257
1258                 if (sbi->s_lvid_bh != bh)
1259                         brelse(bh);
1260                 loc.extLength -= sb->s_blocksize;
1261                 loc.extLocation++;
1262         }
1263         if (sbi->s_lvid_bh != bh)
1264                 brelse(bh);
1265 }
1266
1267 /*
1268  * udf_process_sequence
1269  *
1270  * PURPOSE
1271  *      Process a main/reserve volume descriptor sequence.
1272  *
1273  * PRE-CONDITIONS
1274  *      sb                      Pointer to _locked_ superblock.
1275  *      block                   First block of first extent of the sequence.
1276  *      lastblock               Lastblock of first extent of the sequence.
1277  *
1278  * HISTORY
1279  *      July 1, 1997 - Andrew E. Mileski
1280  *      Written, tested, and released.
1281  */
1282 static int udf_process_sequence(struct super_block *sb, long block,
1283                                 long lastblock, kernel_lb_addr *fileset)
1284 {
1285         struct buffer_head *bh = NULL;
1286         struct udf_vds_record vds[VDS_POS_LENGTH];
1287         struct udf_vds_record *curr;
1288         struct generic_desc *gd;
1289         struct volDescPtr *vdp;
1290         int done = 0;
1291         int i, j;
1292         uint32_t vdsn;
1293         uint16_t ident;
1294         long next_s = 0, next_e = 0;
1295
1296         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1297
1298         /* Read the main descriptor sequence */
1299         for (; (!done && block <= lastblock); block++) {
1300
1301                 bh = udf_read_tagged(sb, block, block, &ident);
1302                 if (!bh)
1303                         break;
1304
1305                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1306                 gd = (struct generic_desc *)bh->b_data;
1307                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1308                 switch (ident) {
1309                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1310                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1311                         if (vdsn >= curr->volDescSeqNum) {
1312                                 curr->volDescSeqNum = vdsn;
1313                                 curr->block = block;
1314                         }
1315                         break;
1316                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1317                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1318                         if (vdsn >= curr->volDescSeqNum) {
1319                                 curr->volDescSeqNum = vdsn;
1320                                 curr->block = block;
1321
1322                                 vdp = (struct volDescPtr *)bh->b_data;
1323                                 next_s = le32_to_cpu(
1324                                         vdp->nextVolDescSeqExt.extLocation);
1325                                 next_e = le32_to_cpu(
1326                                         vdp->nextVolDescSeqExt.extLength);
1327                                 next_e = next_e >> sb->s_blocksize_bits;
1328                                 next_e += next_s;
1329                         }
1330                         break;
1331                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1332                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1333                         if (vdsn >= curr->volDescSeqNum) {
1334                                 curr->volDescSeqNum = vdsn;
1335                                 curr->block = block;
1336                         }
1337                         break;
1338                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1339                         curr = &vds[VDS_POS_PARTITION_DESC];
1340                         if (!curr->block)
1341                                 curr->block = block;
1342                         break;
1343                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1344                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1345                         if (vdsn >= curr->volDescSeqNum) {
1346                                 curr->volDescSeqNum = vdsn;
1347                                 curr->block = block;
1348                         }
1349                         break;
1350                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1351                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1352                         if (vdsn >= curr->volDescSeqNum) {
1353                                 curr->volDescSeqNum = vdsn;
1354                                 curr->block = block;
1355                         }
1356                         break;
1357                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1358                         vds[VDS_POS_TERMINATING_DESC].block = block;
1359                         if (next_e) {
1360                                 block = next_s;
1361                                 lastblock = next_e;
1362                                 next_s = next_e = 0;
1363                         } else
1364                                 done = 1;
1365                         break;
1366                 }
1367                 brelse(bh);
1368         }
1369         for (i = 0; i < VDS_POS_LENGTH; i++) {
1370                 if (vds[i].block) {
1371                         bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
1372                                              &ident);
1373
1374                         if (i == VDS_POS_PRIMARY_VOL_DESC) {
1375                                 udf_load_pvoldesc(sb, bh);
1376                         } else if (i == VDS_POS_LOGICAL_VOL_DESC) {
1377                                 if (udf_load_logicalvol(sb, bh, fileset)) {
1378                                         brelse(bh);
1379                                         return 1;
1380                                 }
1381                         } else if (i == VDS_POS_PARTITION_DESC) {
1382                                 struct buffer_head *bh2 = NULL;
1383                                 if (udf_load_partdesc(sb, bh)) {
1384                                         brelse(bh);
1385                                         return 1;
1386                                 }
1387                                 for (j = vds[i].block + 1;
1388                                      j <  vds[VDS_POS_TERMINATING_DESC].block;
1389                                      j++) {
1390                                         bh2 = udf_read_tagged(sb, j, j, &ident);
1391                                         gd = (struct generic_desc *)bh2->b_data;
1392                                         if (ident == TAG_IDENT_PD)
1393                                                 if (udf_load_partdesc(sb,
1394                                                                       bh2)) {
1395                                                         brelse(bh);
1396                                                         brelse(bh2);
1397                                                         return 1;
1398                                                 }
1399                                         brelse(bh2);
1400                                 }
1401                         }
1402                         brelse(bh);
1403                 }
1404         }
1405
1406         return 0;
1407 }
1408
1409 /*
1410  * udf_check_valid()
1411  */
1412 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1413 {
1414         long block;
1415
1416         if (novrs) {
1417                 udf_debug("Validity check skipped because of novrs option\n");
1418                 return 0;
1419         }
1420         /* Check that it is NSR02 compliant */
1421         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1422         else {
1423                 block = udf_vrs(sb, silent);
1424                 if (block == -1) {
1425                         struct udf_sb_info *sbi = UDF_SB(sb);
1426                         udf_debug("Failed to read byte 32768. Assuming open "
1427                                   "disc. Skipping validity check\n");
1428                         if (!sbi->s_last_block)
1429                                 sbi->s_last_block = udf_get_last_block(sb);
1430                         return 0;
1431                 } else
1432                         return !block;
1433         }
1434 }
1435
1436 static int udf_load_partition(struct super_block *sb, kernel_lb_addr *fileset)
1437 {
1438         struct anchorVolDescPtr *anchor;
1439         uint16_t ident;
1440         struct buffer_head *bh;
1441         long main_s, main_e, reserve_s, reserve_e;
1442         int i, j;
1443         struct udf_sb_info *sbi;
1444
1445         if (!sb)
1446                 return 1;
1447         sbi = UDF_SB(sb);
1448
1449         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1450                 if (!sbi->s_anchor[i])
1451                         continue;
1452                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1453                                      &ident);
1454                 if (!bh)
1455                         continue;
1456
1457                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1458
1459                 /* Locate the main sequence */
1460                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1461                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1462                 main_e = main_e >> sb->s_blocksize_bits;
1463                 main_e += main_s;
1464
1465                 /* Locate the reserve sequence */
1466                 reserve_s = le32_to_cpu(
1467                                 anchor->reserveVolDescSeqExt.extLocation);
1468                 reserve_e = le32_to_cpu(
1469                                 anchor->reserveVolDescSeqExt.extLength);
1470                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1471                 reserve_e += reserve_s;
1472
1473                 brelse(bh);
1474
1475                 /* Process the main & reserve sequences */
1476                 /* responsible for finding the PartitionDesc(s) */
1477                 if (!(udf_process_sequence(sb, main_s, main_e,
1478                                            fileset) &&
1479                       udf_process_sequence(sb, reserve_s, reserve_e,
1480                                            fileset)))
1481                         break;
1482         }
1483
1484         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1485                 udf_debug("No Anchor block found\n");
1486                 return 1;
1487         }
1488         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1489
1490         for (i = 0; i < sbi->s_partitions; i++) {
1491                 kernel_lb_addr uninitialized_var(ino);
1492                 struct udf_part_map *map = &sbi->s_partmaps[i];
1493                 switch (map->s_partition_type) {
1494                 case UDF_VIRTUAL_MAP15:
1495                 case UDF_VIRTUAL_MAP20:
1496                         if (!sbi->s_last_block) {
1497                                 sbi->s_last_block = udf_get_last_block(sb);
1498                                 udf_find_anchor(sb);
1499                         }
1500
1501                         if (!sbi->s_last_block) {
1502                                 udf_debug("Unable to determine Lastblock (For "
1503                                           "Virtual Partition)\n");
1504                                 return 1;
1505                         }
1506
1507                         for (j = 0; j < sbi->s_partitions; j++) {
1508                                 struct udf_part_map *map2 = &sbi->s_partmaps[j];
1509                                 if (j != i &&
1510                                     map->s_volumeseqnum ==
1511                                                 map2->s_volumeseqnum &&
1512                                     map->s_partition_num ==
1513                                                 map2->s_partition_num) {
1514                                         ino.partitionReferenceNum = j;
1515                                         ino.logicalBlockNum =
1516                                                 sbi->s_last_block -
1517                                                         map2->s_partition_root;
1518                                         break;
1519                                 }
1520                         }
1521
1522                         if (j == sbi->s_partitions)
1523                                 return 1;
1524
1525                         sbi->s_vat_inode = udf_iget(sb, ino);
1526                         if (!sbi->s_vat_inode)
1527                                 return 1;
1528
1529                         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1530                                 map->s_type_specific.s_virtual.s_start_offset =
1531                                         udf_ext0_offset(sbi->s_vat_inode);
1532                                 map->s_type_specific.s_virtual.s_num_entries =
1533                                         (sbi->s_vat_inode->i_size - 36) >> 2;
1534                         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1535                                 uint32_t pos;
1536                                 struct virtualAllocationTable20 *vat20;
1537
1538                                 pos = udf_block_map(sbi->s_vat_inode, 0);
1539                                 bh = sb_bread(sb, pos);
1540                                 if (!bh)
1541                                         return 1;
1542                                 vat20 = (struct virtualAllocationTable20 *)
1543                                         bh->b_data +
1544                                         udf_ext0_offset(sbi->s_vat_inode);
1545                                 map->s_type_specific.s_virtual.s_start_offset =
1546                                         le16_to_cpu(vat20->lengthHeader) +
1547                                         udf_ext0_offset(sbi->s_vat_inode);
1548                                 map->s_type_specific.s_virtual.s_num_entries =
1549                                         (sbi->s_vat_inode->i_size -
1550                                          map->s_type_specific.s_virtual.
1551                                                         s_start_offset) >> 2;
1552                                 brelse(bh);
1553                         }
1554                         map->s_partition_root = udf_get_pblock(sb, 0, i, 0);
1555                         map->s_partition_len =
1556                                 sbi->s_partmaps[ino.partitionReferenceNum].
1557                                                                 s_partition_len;
1558                 }
1559         }
1560         return 0;
1561 }
1562
1563 static void udf_open_lvid(struct super_block *sb)
1564 {
1565         struct udf_sb_info *sbi = UDF_SB(sb);
1566         struct buffer_head *bh = sbi->s_lvid_bh;
1567         if (bh) {
1568                 kernel_timestamp cpu_time;
1569                 struct logicalVolIntegrityDesc *lvid =
1570                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1571                 struct logicalVolIntegrityDescImpUse *lvidiu =
1572                                                         udf_sb_lvidiu(sbi);
1573
1574                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1575                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1576                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1577                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1578                 lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1579
1580                 lvid->descTag.descCRC = cpu_to_le16(
1581                         udf_crc((char *)lvid + sizeof(tag),
1582                                 le16_to_cpu(lvid->descTag.descCRCLength),
1583                                 0));
1584
1585                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1586                 mark_buffer_dirty(bh);
1587         }
1588 }
1589
1590 static void udf_close_lvid(struct super_block *sb)
1591 {
1592         kernel_timestamp cpu_time;
1593         struct udf_sb_info *sbi = UDF_SB(sb);
1594         struct buffer_head *bh = sbi->s_lvid_bh;
1595         struct logicalVolIntegrityDesc *lvid;
1596
1597         if (!bh)
1598                 return;
1599
1600         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1601
1602         if (lvid->integrityType == LVID_INTEGRITY_TYPE_OPEN) {
1603                 struct logicalVolIntegrityDescImpUse *lvidiu =
1604                                                         udf_sb_lvidiu(sbi);
1605                 lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1606                 lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1607                 if (udf_time_to_stamp(&cpu_time, CURRENT_TIME))
1608                         lvid->recordingDateAndTime = cpu_to_lets(cpu_time);
1609                 if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1610                         lvidiu->maxUDFWriteRev =
1611                                         cpu_to_le16(UDF_MAX_WRITE_VERSION);
1612                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1613                         lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1614                 if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1615                         lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1616                 lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1617
1618                 lvid->descTag.descCRC = cpu_to_le16(
1619                         udf_crc((char *)lvid + sizeof(tag),
1620                                 le16_to_cpu(lvid->descTag.descCRCLength),
1621                                 0));
1622
1623                 lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1624                 mark_buffer_dirty(bh);
1625         }
1626 }
1627
1628 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1629 {
1630         int i;
1631         int nr_groups = bitmap->s_nr_groups;
1632         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1633                                                 nr_groups);
1634
1635         for (i = 0; i < nr_groups; i++)
1636                 if (bitmap->s_block_bitmap[i])
1637                         brelse(bitmap->s_block_bitmap[i]);
1638
1639         if (size <= PAGE_SIZE)
1640                 kfree(bitmap);
1641         else
1642                 vfree(bitmap);
1643 }
1644
1645 /*
1646  * udf_read_super
1647  *
1648  * PURPOSE
1649  *      Complete the specified super block.
1650  *
1651  * PRE-CONDITIONS
1652  *      sb                      Pointer to superblock to complete - never NULL.
1653  *      sb->s_dev               Device to read suberblock from.
1654  *      options                 Pointer to mount options.
1655  *      silent                  Silent flag.
1656  *
1657  * HISTORY
1658  *      July 1, 1997 - Andrew E. Mileski
1659  *      Written, tested, and released.
1660  */
1661 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1662 {
1663         int i;
1664         struct inode *inode = NULL;
1665         struct udf_options uopt;
1666         kernel_lb_addr rootdir, fileset;
1667         struct udf_sb_info *sbi;
1668
1669         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1670         uopt.uid = -1;
1671         uopt.gid = -1;
1672         uopt.umask = 0;
1673
1674         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1675         if (!sbi)
1676                 return -ENOMEM;
1677
1678         sb->s_fs_info = sbi;
1679
1680         mutex_init(&sbi->s_alloc_mutex);
1681
1682         if (!udf_parse_options((char *)options, &uopt))
1683                 goto error_out;
1684
1685         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1686             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1687                 udf_error(sb, "udf_read_super",
1688                           "utf8 cannot be combined with iocharset\n");
1689                 goto error_out;
1690         }
1691 #ifdef CONFIG_UDF_NLS
1692         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1693                 uopt.nls_map = load_nls_default();
1694                 if (!uopt.nls_map)
1695                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1696                 else
1697                         udf_debug("Using default NLS map\n");
1698         }
1699 #endif
1700         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1701                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1702
1703         fileset.logicalBlockNum = 0xFFFFFFFF;
1704         fileset.partitionReferenceNum = 0xFFFF;
1705
1706         sbi->s_flags = uopt.flags;
1707         sbi->s_uid = uopt.uid;
1708         sbi->s_gid = uopt.gid;
1709         sbi->s_umask = uopt.umask;
1710         sbi->s_nls_map = uopt.nls_map;
1711
1712         /* Set the block size for all transfers */
1713         if (!udf_set_blocksize(sb, uopt.blocksize))
1714                 goto error_out;
1715
1716         if (uopt.session == 0xFFFFFFFF)
1717                 sbi->s_session = udf_get_last_session(sb);
1718         else
1719                 sbi->s_session = uopt.session;
1720
1721         udf_debug("Multi-session=%d\n", sbi->s_session);
1722
1723         sbi->s_last_block = uopt.lastblock;
1724         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1725         sbi->s_anchor[2] = uopt.anchor;
1726         sbi->s_anchor[3] = 256;
1727
1728         if (udf_check_valid(sb, uopt.novrs, silent)) {
1729                 /* read volume recognition sequences */
1730                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1731                 goto error_out;
1732         }
1733
1734         udf_find_anchor(sb);
1735
1736         /* Fill in the rest of the superblock */
1737         sb->s_op = &udf_sb_ops;
1738         sb->dq_op = NULL;
1739         sb->s_dirt = 0;
1740         sb->s_magic = UDF_SUPER_MAGIC;
1741         sb->s_time_gran = 1000;
1742
1743         if (udf_load_partition(sb, &fileset)) {
1744                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1745                 goto error_out;
1746         }
1747
1748         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1749
1750         if (sbi->s_lvid_bh) {
1751                 struct logicalVolIntegrityDescImpUse *lvidiu =
1752                                                         udf_sb_lvidiu(sbi);
1753                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1754                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1755                 /* uint16_t maxUDFWriteRev =
1756                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1757
1758                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1759                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1760                                         "(max is %x)\n",
1761                                le16_to_cpu(lvidiu->minUDFReadRev),
1762                                UDF_MAX_READ_VERSION);
1763                         goto error_out;
1764                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1765                         sb->s_flags |= MS_RDONLY;
1766
1767                 sbi->s_udfrev = minUDFWriteRev;
1768
1769                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1770                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1771                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1772                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1773         }
1774
1775         if (!sbi->s_partitions) {
1776                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1777                 goto error_out;
1778         }
1779
1780         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1781                         UDF_PART_FLAG_READ_ONLY) {
1782                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1783                                    "forcing readonly mount\n");
1784                 sb->s_flags |= MS_RDONLY;
1785         }
1786
1787         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1788                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1789                 goto error_out;
1790         }
1791
1792         if (!silent) {
1793                 kernel_timestamp ts;
1794                 udf_time_to_stamp(&ts, sbi->s_record_time);
1795                 udf_info("UDF %s (%s) Mounting volume '%s', "
1796                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1797                          UDFFS_VERSION, UDFFS_DATE,
1798                          sbi->s_volume_ident, ts.year, ts.month, ts.day,
1799                          ts.hour, ts.minute, ts.typeAndTimezone);
1800         }
1801         if (!(sb->s_flags & MS_RDONLY))
1802                 udf_open_lvid(sb);
1803
1804         /* Assign the root inode */
1805         /* assign inodes by physical block number */
1806         /* perhaps it's not extensible enough, but for now ... */
1807         inode = udf_iget(sb, rootdir);
1808         if (!inode) {
1809                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1810                                 "partition=%d\n",
1811                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1812                 goto error_out;
1813         }
1814
1815         /* Allocate a dentry for the root inode */
1816         sb->s_root = d_alloc_root(inode);
1817         if (!sb->s_root) {
1818                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1819                 iput(inode);
1820                 goto error_out;
1821         }
1822         sb->s_maxbytes = MAX_LFS_FILESIZE;
1823         return 0;
1824
1825 error_out:
1826         if (sbi->s_vat_inode)
1827                 iput(sbi->s_vat_inode);
1828         if (sbi->s_partitions) {
1829                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1830                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1831                         iput(map->s_uspace.s_table);
1832                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1833                         iput(map->s_fspace.s_table);
1834                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1835                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1836                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1837                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1838                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1839                         for (i = 0; i < 4; i++)
1840                                 brelse(map->s_type_specific.s_sparing.
1841                                                 s_spar_map[i]);
1842         }
1843 #ifdef CONFIG_UDF_NLS
1844         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1845                 unload_nls(sbi->s_nls_map);
1846 #endif
1847         if (!(sb->s_flags & MS_RDONLY))
1848                 udf_close_lvid(sb);
1849         brelse(sbi->s_lvid_bh);
1850
1851         kfree(sbi->s_partmaps);
1852         kfree(sbi);
1853         sb->s_fs_info = NULL;
1854
1855         return -EINVAL;
1856 }
1857
1858 void udf_error(struct super_block *sb, const char *function,
1859                const char *fmt, ...)
1860 {
1861         va_list args;
1862
1863         if (!(sb->s_flags & MS_RDONLY)) {
1864                 /* mark sb error */
1865                 sb->s_dirt = 1;
1866         }
1867         va_start(args, fmt);
1868         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1869         va_end(args);
1870         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1871                 sb->s_id, function, error_buf);
1872 }
1873
1874 void udf_warning(struct super_block *sb, const char *function,
1875                  const char *fmt, ...)
1876 {
1877         va_list args;
1878
1879         va_start(args, fmt);
1880         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1881         va_end(args);
1882         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1883                sb->s_id, function, error_buf);
1884 }
1885
1886 /*
1887  * udf_put_super
1888  *
1889  * PURPOSE
1890  *      Prepare for destruction of the superblock.
1891  *
1892  * DESCRIPTION
1893  *      Called before the filesystem is unmounted.
1894  *
1895  * HISTORY
1896  *      July 1, 1997 - Andrew E. Mileski
1897  *      Written, tested, and released.
1898  */
1899 static void udf_put_super(struct super_block *sb)
1900 {
1901         int i;
1902         struct udf_sb_info *sbi;
1903
1904         sbi = UDF_SB(sb);
1905         if (sbi->s_vat_inode)
1906                 iput(sbi->s_vat_inode);
1907         if (sbi->s_partitions) {
1908                 struct udf_part_map *map = &sbi->s_partmaps[sbi->s_partition];
1909                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1910                         iput(map->s_uspace.s_table);
1911                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1912                         iput(map->s_fspace.s_table);
1913                 if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1914                         udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1915                 if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1916                         udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1917                 if (map->s_partition_type == UDF_SPARABLE_MAP15)
1918                         for (i = 0; i < 4; i++)
1919                                 brelse(map->s_type_specific.s_sparing.
1920                                                 s_spar_map[i]);
1921         }
1922 #ifdef CONFIG_UDF_NLS
1923         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1924                 unload_nls(sbi->s_nls_map);
1925 #endif
1926         if (!(sb->s_flags & MS_RDONLY))
1927                 udf_close_lvid(sb);
1928         brelse(sbi->s_lvid_bh);
1929         kfree(sbi->s_partmaps);
1930         kfree(sb->s_fs_info);
1931         sb->s_fs_info = NULL;
1932 }
1933
1934 /*
1935  * udf_stat_fs
1936  *
1937  * PURPOSE
1938  *      Return info about the filesystem.
1939  *
1940  * DESCRIPTION
1941  *      Called by sys_statfs()
1942  *
1943  * HISTORY
1944  *      July 1, 1997 - Andrew E. Mileski
1945  *      Written, tested, and released.
1946  */
1947 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1948 {
1949         struct super_block *sb = dentry->d_sb;
1950         struct udf_sb_info *sbi = UDF_SB(sb);
1951         struct logicalVolIntegrityDescImpUse *lvidiu;
1952
1953         if (sbi->s_lvid_bh != NULL)
1954                 lvidiu = udf_sb_lvidiu(sbi);
1955         else
1956                 lvidiu = NULL;
1957
1958         buf->f_type = UDF_SUPER_MAGIC;
1959         buf->f_bsize = sb->s_blocksize;
1960         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1961         buf->f_bfree = udf_count_free(sb);
1962         buf->f_bavail = buf->f_bfree;
1963         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1964                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1965                         + buf->f_bfree;
1966         buf->f_ffree = buf->f_bfree;
1967         /* __kernel_fsid_t f_fsid */
1968         buf->f_namelen = UDF_NAME_LEN - 2;
1969
1970         return 0;
1971 }
1972
1973 static unsigned char udf_bitmap_lookup[16] = {
1974         0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4
1975 };
1976
1977 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1978                                           struct udf_bitmap *bitmap)
1979 {
1980         struct buffer_head *bh = NULL;
1981         unsigned int accum = 0;
1982         int index;
1983         int block = 0, newblock;
1984         kernel_lb_addr loc;
1985         uint32_t bytes;
1986         uint8_t value;
1987         uint8_t *ptr;
1988         uint16_t ident;
1989         struct spaceBitmapDesc *bm;
1990
1991         lock_kernel();
1992
1993         loc.logicalBlockNum = bitmap->s_extPosition;
1994         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1995         bh = udf_read_ptagged(sb, loc, 0, &ident);
1996
1997         if (!bh) {
1998                 printk(KERN_ERR "udf: udf_count_free failed\n");
1999                 goto out;
2000         } else if (ident != TAG_IDENT_SBD) {
2001                 brelse(bh);
2002                 printk(KERN_ERR "udf: udf_count_free failed\n");
2003                 goto out;
2004         }
2005
2006         bm = (struct spaceBitmapDesc *)bh->b_data;
2007         bytes = le32_to_cpu(bm->numOfBytes);
2008         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2009         ptr = (uint8_t *)bh->b_data;
2010
2011         while (bytes > 0) {
2012                 while ((bytes > 0) && (index < sb->s_blocksize)) {
2013                         value = ptr[index];
2014                         accum += udf_bitmap_lookup[value & 0x0f];
2015                         accum += udf_bitmap_lookup[value >> 4];
2016                         index++;
2017                         bytes--;
2018                 }
2019                 if (bytes) {
2020                         brelse(bh);
2021                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2022                         bh = udf_tread(sb, newblock);
2023                         if (!bh) {
2024                                 udf_debug("read failed\n");
2025                                 goto out;
2026                         }
2027                         index = 0;
2028                         ptr = (uint8_t *)bh->b_data;
2029                 }
2030         }
2031         brelse(bh);
2032
2033 out:
2034         unlock_kernel();
2035
2036         return accum;
2037 }
2038
2039 static unsigned int udf_count_free_table(struct super_block *sb,
2040                                          struct inode *table)
2041 {
2042         unsigned int accum = 0;
2043         uint32_t elen;
2044         kernel_lb_addr eloc;
2045         int8_t etype;
2046         struct extent_position epos;
2047
2048         lock_kernel();
2049
2050         epos.block = UDF_I(table)->i_location;
2051         epos.offset = sizeof(struct unallocSpaceEntry);
2052         epos.bh = NULL;
2053
2054         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2055                 accum += (elen >> table->i_sb->s_blocksize_bits);
2056
2057         brelse(epos.bh);
2058
2059         unlock_kernel();
2060
2061         return accum;
2062 }
2063
2064 static unsigned int udf_count_free(struct super_block *sb)
2065 {
2066         unsigned int accum = 0;
2067         struct udf_sb_info *sbi;
2068         struct udf_part_map *map;
2069
2070         sbi = UDF_SB(sb);
2071         if (sbi->s_lvid_bh) {
2072                 struct logicalVolIntegrityDesc *lvid =
2073                         (struct logicalVolIntegrityDesc *)
2074                         sbi->s_lvid_bh->b_data;
2075                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2076                         accum = le32_to_cpu(
2077                                         lvid->freeSpaceTable[sbi->s_partition]);
2078                         if (accum == 0xFFFFFFFF)
2079                                 accum = 0;
2080                 }
2081         }
2082
2083         if (accum)
2084                 return accum;
2085
2086         map = &sbi->s_partmaps[sbi->s_partition];
2087         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2088                 accum += udf_count_free_bitmap(sb,
2089                                                map->s_uspace.s_bitmap);
2090         }
2091         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2092                 accum += udf_count_free_bitmap(sb,
2093                                                map->s_fspace.s_bitmap);
2094         }
2095         if (accum)
2096                 return accum;
2097
2098         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2099                 accum += udf_count_free_table(sb,
2100                                               map->s_uspace.s_table);
2101         }
2102         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2103                 accum += udf_count_free_table(sb,
2104                                               map->s_fspace.s_table);
2105         }
2106
2107         return accum;
2108 }