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