switch open-coded instances of d_make_root() to new helper
[linux-2.6.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/buffer_head.h>
52 #include <linux/vfs.h>
53 #include <linux/vmalloc.h>
54 #include <linux/errno.h>
55 #include <linux/mount.h>
56 #include <linux/seq_file.h>
57 #include <linux/bitmap.h>
58 #include <linux/crc-itu-t.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 enum { UDF_MAX_LINKS = 0xffff };
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 int udf_sync_fs(struct super_block *, int);
84 static int udf_remount_fs(struct super_block *, int *, char *);
85 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
86 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
87                             struct kernel_lb_addr *);
88 static void udf_load_fileset(struct super_block *, struct buffer_head *,
89                              struct kernel_lb_addr *);
90 static void udf_open_lvid(struct super_block *);
91 static void udf_close_lvid(struct super_block *);
92 static unsigned int udf_count_free(struct super_block *);
93 static int udf_statfs(struct dentry *, struct kstatfs *);
94 static int udf_show_options(struct seq_file *, struct dentry *);
95
96 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
97 {
98         struct logicalVolIntegrityDesc *lvid =
99                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
100         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
101         __u32 offset = number_of_partitions * 2 *
102                                 sizeof(uint32_t)/sizeof(uint8_t);
103         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
104 }
105
106 /* UDF filesystem type */
107 static struct dentry *udf_mount(struct file_system_type *fs_type,
108                       int flags, const char *dev_name, void *data)
109 {
110         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
111 }
112
113 static struct file_system_type udf_fstype = {
114         .owner          = THIS_MODULE,
115         .name           = "udf",
116         .mount          = udf_mount,
117         .kill_sb        = kill_block_super,
118         .fs_flags       = FS_REQUIRES_DEV,
119 };
120
121 static struct kmem_cache *udf_inode_cachep;
122
123 static struct inode *udf_alloc_inode(struct super_block *sb)
124 {
125         struct udf_inode_info *ei;
126         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
127         if (!ei)
128                 return NULL;
129
130         ei->i_unique = 0;
131         ei->i_lenExtents = 0;
132         ei->i_next_alloc_block = 0;
133         ei->i_next_alloc_goal = 0;
134         ei->i_strat4096 = 0;
135         init_rwsem(&ei->i_data_sem);
136
137         return &ei->vfs_inode;
138 }
139
140 static void udf_i_callback(struct rcu_head *head)
141 {
142         struct inode *inode = container_of(head, struct inode, i_rcu);
143         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
144 }
145
146 static void udf_destroy_inode(struct inode *inode)
147 {
148         call_rcu(&inode->i_rcu, udf_i_callback);
149 }
150
151 static void init_once(void *foo)
152 {
153         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
154
155         ei->i_ext.i_data = NULL;
156         inode_init_once(&ei->vfs_inode);
157 }
158
159 static int init_inodecache(void)
160 {
161         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
162                                              sizeof(struct udf_inode_info),
163                                              0, (SLAB_RECLAIM_ACCOUNT |
164                                                  SLAB_MEM_SPREAD),
165                                              init_once);
166         if (!udf_inode_cachep)
167                 return -ENOMEM;
168         return 0;
169 }
170
171 static void destroy_inodecache(void)
172 {
173         kmem_cache_destroy(udf_inode_cachep);
174 }
175
176 /* Superblock operations */
177 static const struct super_operations udf_sb_ops = {
178         .alloc_inode    = udf_alloc_inode,
179         .destroy_inode  = udf_destroy_inode,
180         .write_inode    = udf_write_inode,
181         .evict_inode    = udf_evict_inode,
182         .put_super      = udf_put_super,
183         .sync_fs        = udf_sync_fs,
184         .statfs         = udf_statfs,
185         .remount_fs     = udf_remount_fs,
186         .show_options   = udf_show_options,
187 };
188
189 struct udf_options {
190         unsigned char novrs;
191         unsigned int blocksize;
192         unsigned int session;
193         unsigned int lastblock;
194         unsigned int anchor;
195         unsigned int volume;
196         unsigned short partition;
197         unsigned int fileset;
198         unsigned int rootdir;
199         unsigned int flags;
200         umode_t umask;
201         gid_t gid;
202         uid_t uid;
203         umode_t fmode;
204         umode_t dmode;
205         struct nls_table *nls_map;
206 };
207
208 static int __init init_udf_fs(void)
209 {
210         int err;
211
212         err = init_inodecache();
213         if (err)
214                 goto out1;
215         err = register_filesystem(&udf_fstype);
216         if (err)
217                 goto out;
218
219         return 0;
220
221 out:
222         destroy_inodecache();
223
224 out1:
225         return err;
226 }
227
228 static void __exit exit_udf_fs(void)
229 {
230         unregister_filesystem(&udf_fstype);
231         destroy_inodecache();
232 }
233
234 module_init(init_udf_fs)
235 module_exit(exit_udf_fs)
236
237 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
238 {
239         struct udf_sb_info *sbi = UDF_SB(sb);
240
241         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
242                                   GFP_KERNEL);
243         if (!sbi->s_partmaps) {
244                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
245                         count);
246                 sbi->s_partitions = 0;
247                 return -ENOMEM;
248         }
249
250         sbi->s_partitions = count;
251         return 0;
252 }
253
254 static int udf_show_options(struct seq_file *seq, struct dentry *root)
255 {
256         struct super_block *sb = root->d_sb;
257         struct udf_sb_info *sbi = UDF_SB(sb);
258
259         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
260                 seq_puts(seq, ",nostrict");
261         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
262                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
263         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
264                 seq_puts(seq, ",unhide");
265         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
266                 seq_puts(seq, ",undelete");
267         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
268                 seq_puts(seq, ",noadinicb");
269         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
270                 seq_puts(seq, ",shortad");
271         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
272                 seq_puts(seq, ",uid=forget");
273         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
274                 seq_puts(seq, ",uid=ignore");
275         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
276                 seq_puts(seq, ",gid=forget");
277         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
278                 seq_puts(seq, ",gid=ignore");
279         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
280                 seq_printf(seq, ",uid=%u", sbi->s_uid);
281         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
282                 seq_printf(seq, ",gid=%u", sbi->s_gid);
283         if (sbi->s_umask != 0)
284                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
285         if (sbi->s_fmode != UDF_INVALID_MODE)
286                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
287         if (sbi->s_dmode != UDF_INVALID_MODE)
288                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
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         if (sbi->s_anchor != 0)
294                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
295         /*
296          * volume, partition, fileset and rootdir seem to be ignored
297          * currently
298          */
299         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
300                 seq_puts(seq, ",utf8");
301         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
302                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
303
304         return 0;
305 }
306
307 /*
308  * udf_parse_options
309  *
310  * PURPOSE
311  *      Parse mount options.
312  *
313  * DESCRIPTION
314  *      The following mount options are supported:
315  *
316  *      gid=            Set the default group.
317  *      umask=          Set the default umask.
318  *      mode=           Set the default file permissions.
319  *      dmode=          Set the default directory permissions.
320  *      uid=            Set the default user.
321  *      bs=             Set the block size.
322  *      unhide          Show otherwise hidden files.
323  *      undelete        Show deleted files in lists.
324  *      adinicb         Embed data in the inode (default)
325  *      noadinicb       Don't embed data in the inode
326  *      shortad         Use short ad's
327  *      longad          Use long ad's (default)
328  *      nostrict        Unset strict conformance
329  *      iocharset=      Set the NLS character set
330  *
331  *      The remaining are for debugging and disaster recovery:
332  *
333  *      novrs           Skip volume sequence recognition
334  *
335  *      The following expect a offset from 0.
336  *
337  *      session=        Set the CDROM session (default= last session)
338  *      anchor=         Override standard anchor location. (default= 256)
339  *      volume=         Override the VolumeDesc location. (unused)
340  *      partition=      Override the PartitionDesc location. (unused)
341  *      lastblock=      Set the last block of the filesystem/
342  *
343  *      The following expect a offset from the partition root.
344  *
345  *      fileset=        Override the fileset block location. (unused)
346  *      rootdir=        Override the root directory location. (unused)
347  *              WARNING: overriding the rootdir to a non-directory may
348  *              yield highly unpredictable results.
349  *
350  * PRE-CONDITIONS
351  *      options         Pointer to mount options string.
352  *      uopts           Pointer to mount options variable.
353  *
354  * POST-CONDITIONS
355  *      <return>        1       Mount options parsed okay.
356  *      <return>        0       Error parsing mount options.
357  *
358  * HISTORY
359  *      July 1, 1997 - Andrew E. Mileski
360  *      Written, tested, and released.
361  */
362
363 enum {
364         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
365         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
366         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
367         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
368         Opt_rootdir, Opt_utf8, Opt_iocharset,
369         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
370         Opt_fmode, Opt_dmode
371 };
372
373 static const match_table_t tokens = {
374         {Opt_novrs,     "novrs"},
375         {Opt_nostrict,  "nostrict"},
376         {Opt_bs,        "bs=%u"},
377         {Opt_unhide,    "unhide"},
378         {Opt_undelete,  "undelete"},
379         {Opt_noadinicb, "noadinicb"},
380         {Opt_adinicb,   "adinicb"},
381         {Opt_shortad,   "shortad"},
382         {Opt_longad,    "longad"},
383         {Opt_uforget,   "uid=forget"},
384         {Opt_uignore,   "uid=ignore"},
385         {Opt_gforget,   "gid=forget"},
386         {Opt_gignore,   "gid=ignore"},
387         {Opt_gid,       "gid=%u"},
388         {Opt_uid,       "uid=%u"},
389         {Opt_umask,     "umask=%o"},
390         {Opt_session,   "session=%u"},
391         {Opt_lastblock, "lastblock=%u"},
392         {Opt_anchor,    "anchor=%u"},
393         {Opt_volume,    "volume=%u"},
394         {Opt_partition, "partition=%u"},
395         {Opt_fileset,   "fileset=%u"},
396         {Opt_rootdir,   "rootdir=%u"},
397         {Opt_utf8,      "utf8"},
398         {Opt_iocharset, "iocharset=%s"},
399         {Opt_fmode,     "mode=%o"},
400         {Opt_dmode,     "dmode=%o"},
401         {Opt_err,       NULL}
402 };
403
404 static int udf_parse_options(char *options, struct udf_options *uopt,
405                              bool remount)
406 {
407         char *p;
408         int option;
409
410         uopt->novrs = 0;
411         uopt->partition = 0xFFFF;
412         uopt->session = 0xFFFFFFFF;
413         uopt->lastblock = 0;
414         uopt->anchor = 0;
415         uopt->volume = 0xFFFFFFFF;
416         uopt->rootdir = 0xFFFFFFFF;
417         uopt->fileset = 0xFFFFFFFF;
418         uopt->nls_map = NULL;
419
420         if (!options)
421                 return 1;
422
423         while ((p = strsep(&options, ",")) != NULL) {
424                 substring_t args[MAX_OPT_ARGS];
425                 int token;
426                 if (!*p)
427                         continue;
428
429                 token = match_token(p, tokens, args);
430                 switch (token) {
431                 case Opt_novrs:
432                         uopt->novrs = 1;
433                         break;
434                 case Opt_bs:
435                         if (match_int(&args[0], &option))
436                                 return 0;
437                         uopt->blocksize = option;
438                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
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                 case Opt_fmode:
539                         if (match_octal(args, &option))
540                                 return 0;
541                         uopt->fmode = option & 0777;
542                         break;
543                 case Opt_dmode:
544                         if (match_octal(args, &option))
545                                 return 0;
546                         uopt->dmode = option & 0777;
547                         break;
548                 default:
549                         pr_err("bad mount option \"%s\" or missing value\n", p);
550                         return 0;
551                 }
552         }
553         return 1;
554 }
555
556 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
557 {
558         struct udf_options uopt;
559         struct udf_sb_info *sbi = UDF_SB(sb);
560         int error = 0;
561
562         uopt.flags = sbi->s_flags;
563         uopt.uid   = sbi->s_uid;
564         uopt.gid   = sbi->s_gid;
565         uopt.umask = sbi->s_umask;
566         uopt.fmode = sbi->s_fmode;
567         uopt.dmode = sbi->s_dmode;
568
569         if (!udf_parse_options(options, &uopt, true))
570                 return -EINVAL;
571
572         write_lock(&sbi->s_cred_lock);
573         sbi->s_flags = uopt.flags;
574         sbi->s_uid   = uopt.uid;
575         sbi->s_gid   = uopt.gid;
576         sbi->s_umask = uopt.umask;
577         sbi->s_fmode = uopt.fmode;
578         sbi->s_dmode = uopt.dmode;
579         write_unlock(&sbi->s_cred_lock);
580
581         if (sbi->s_lvid_bh) {
582                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
583                 if (write_rev > UDF_MAX_WRITE_VERSION)
584                         *flags |= MS_RDONLY;
585         }
586
587         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
588                 goto out_unlock;
589
590         if (*flags & MS_RDONLY)
591                 udf_close_lvid(sb);
592         else
593                 udf_open_lvid(sb);
594
595 out_unlock:
596         return error;
597 }
598
599 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
600 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
601 static loff_t udf_check_vsd(struct super_block *sb)
602 {
603         struct volStructDesc *vsd = NULL;
604         loff_t sector = 32768;
605         int sectorsize;
606         struct buffer_head *bh = NULL;
607         int nsr02 = 0;
608         int nsr03 = 0;
609         struct udf_sb_info *sbi;
610
611         sbi = UDF_SB(sb);
612         if (sb->s_blocksize < sizeof(struct volStructDesc))
613                 sectorsize = sizeof(struct volStructDesc);
614         else
615                 sectorsize = sb->s_blocksize;
616
617         sector += (sbi->s_session << sb->s_blocksize_bits);
618
619         udf_debug("Starting at sector %u (%ld byte sectors)\n",
620                   (unsigned int)(sector >> sb->s_blocksize_bits),
621                   sb->s_blocksize);
622         /* Process the sequence (if applicable) */
623         for (; !nsr02 && !nsr03; sector += sectorsize) {
624                 /* Read a block */
625                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
626                 if (!bh)
627                         break;
628
629                 /* Look for ISO  descriptors */
630                 vsd = (struct volStructDesc *)(bh->b_data +
631                                               (sector & (sb->s_blocksize - 1)));
632
633                 if (vsd->stdIdent[0] == 0) {
634                         brelse(bh);
635                         break;
636                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
637                                     VSD_STD_ID_LEN)) {
638                         switch (vsd->structType) {
639                         case 0:
640                                 udf_debug("ISO9660 Boot Record found\n");
641                                 break;
642                         case 1:
643                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
644                                 break;
645                         case 2:
646                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
647                                 break;
648                         case 3:
649                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
650                                 break;
651                         case 255:
652                                 udf_debug("ISO9660 Volume Descriptor Set 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 static int udf_find_fileset(struct super_block *sb,
686                             struct kernel_lb_addr *fileset,
687                             struct kernel_lb_addr *root)
688 {
689         struct buffer_head *bh = NULL;
690         long lastblock;
691         uint16_t ident;
692         struct udf_sb_info *sbi;
693
694         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
695             fileset->partitionReferenceNum != 0xFFFF) {
696                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
697
698                 if (!bh) {
699                         return 1;
700                 } else if (ident != TAG_IDENT_FSD) {
701                         brelse(bh);
702                         return 1;
703                 }
704
705         }
706
707         sbi = UDF_SB(sb);
708         if (!bh) {
709                 /* Search backwards through the partitions */
710                 struct kernel_lb_addr newfileset;
711
712 /* --> cvg: FIXME - is it reasonable? */
713                 return 1;
714
715                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
716                      (newfileset.partitionReferenceNum != 0xFFFF &&
717                       fileset->logicalBlockNum == 0xFFFFFFFF &&
718                       fileset->partitionReferenceNum == 0xFFFF);
719                      newfileset.partitionReferenceNum--) {
720                         lastblock = sbi->s_partmaps
721                                         [newfileset.partitionReferenceNum]
722                                                 .s_partition_len;
723                         newfileset.logicalBlockNum = 0;
724
725                         do {
726                                 bh = udf_read_ptagged(sb, &newfileset, 0,
727                                                       &ident);
728                                 if (!bh) {
729                                         newfileset.logicalBlockNum++;
730                                         continue;
731                                 }
732
733                                 switch (ident) {
734                                 case TAG_IDENT_SBD:
735                                 {
736                                         struct spaceBitmapDesc *sp;
737                                         sp = (struct spaceBitmapDesc *)
738                                                                 bh->b_data;
739                                         newfileset.logicalBlockNum += 1 +
740                                                 ((le32_to_cpu(sp->numOfBytes) +
741                                                   sizeof(struct spaceBitmapDesc)
742                                                   - 1) >> sb->s_blocksize_bits);
743                                         brelse(bh);
744                                         break;
745                                 }
746                                 case TAG_IDENT_FSD:
747                                         *fileset = newfileset;
748                                         break;
749                                 default:
750                                         newfileset.logicalBlockNum++;
751                                         brelse(bh);
752                                         bh = NULL;
753                                         break;
754                                 }
755                         } while (newfileset.logicalBlockNum < lastblock &&
756                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
757                                  fileset->partitionReferenceNum == 0xFFFF);
758                 }
759         }
760
761         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
762              fileset->partitionReferenceNum != 0xFFFF) && bh) {
763                 udf_debug("Fileset at block=%d, partition=%d\n",
764                           fileset->logicalBlockNum,
765                           fileset->partitionReferenceNum);
766
767                 sbi->s_partition = fileset->partitionReferenceNum;
768                 udf_load_fileset(sb, bh, root);
769                 brelse(bh);
770                 return 0;
771         }
772         return 1;
773 }
774
775 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
776 {
777         struct primaryVolDesc *pvoldesc;
778         struct ustr *instr, *outstr;
779         struct buffer_head *bh;
780         uint16_t ident;
781         int ret = 1;
782
783         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
784         if (!instr)
785                 return 1;
786
787         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
788         if (!outstr)
789                 goto out1;
790
791         bh = udf_read_tagged(sb, block, block, &ident);
792         if (!bh)
793                 goto out2;
794
795         BUG_ON(ident != TAG_IDENT_PVD);
796
797         pvoldesc = (struct primaryVolDesc *)bh->b_data;
798
799         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
800                               pvoldesc->recordingDateAndTime)) {
801 #ifdef UDFFS_DEBUG
802                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
803                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
804                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
805                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
806 #endif
807         }
808
809         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
810                 if (udf_CS0toUTF8(outstr, instr)) {
811                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
812                                 outstr->u_len > 31 ? 31 : outstr->u_len);
813                         udf_debug("volIdent[] = '%s'\n",
814                                   UDF_SB(sb)->s_volume_ident);
815                 }
816
817         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
818                 if (udf_CS0toUTF8(outstr, instr))
819                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
820
821         brelse(bh);
822         ret = 0;
823 out2:
824         kfree(outstr);
825 out1:
826         kfree(instr);
827         return ret;
828 }
829
830 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
831                                         u32 meta_file_loc, u32 partition_num)
832 {
833         struct kernel_lb_addr addr;
834         struct inode *metadata_fe;
835
836         addr.logicalBlockNum = meta_file_loc;
837         addr.partitionReferenceNum = partition_num;
838
839         metadata_fe = udf_iget(sb, &addr);
840
841         if (metadata_fe == NULL)
842                 udf_warn(sb, "metadata inode efe not found\n");
843         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
844                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
845                 iput(metadata_fe);
846                 metadata_fe = NULL;
847         }
848
849         return metadata_fe;
850 }
851
852 static int udf_load_metadata_files(struct super_block *sb, int partition)
853 {
854         struct udf_sb_info *sbi = UDF_SB(sb);
855         struct udf_part_map *map;
856         struct udf_meta_data *mdata;
857         struct kernel_lb_addr addr;
858
859         map = &sbi->s_partmaps[partition];
860         mdata = &map->s_type_specific.s_metadata;
861
862         /* metadata address */
863         udf_debug("Metadata file location: block = %d part = %d\n",
864                   mdata->s_meta_file_loc, map->s_partition_num);
865
866         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
867                 mdata->s_meta_file_loc, map->s_partition_num);
868
869         if (mdata->s_metadata_fe == NULL) {
870                 /* mirror file entry */
871                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
872                           mdata->s_mirror_file_loc, map->s_partition_num);
873
874                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
875                         mdata->s_mirror_file_loc, map->s_partition_num);
876
877                 if (mdata->s_mirror_fe == NULL) {
878                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
879                         goto error_exit;
880                 }
881         }
882
883         /*
884          * bitmap file entry
885          * Note:
886          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
887         */
888         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
889                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
890                 addr.partitionReferenceNum = map->s_partition_num;
891
892                 udf_debug("Bitmap file location: block = %d part = %d\n",
893                           addr.logicalBlockNum, addr.partitionReferenceNum);
894
895                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
896
897                 if (mdata->s_bitmap_fe == NULL) {
898                         if (sb->s_flags & MS_RDONLY)
899                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
900                         else {
901                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
902                                 goto error_exit;
903                         }
904                 }
905         }
906
907         udf_debug("udf_load_metadata_files Ok\n");
908
909         return 0;
910
911 error_exit:
912         return 1;
913 }
914
915 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
916                              struct kernel_lb_addr *root)
917 {
918         struct fileSetDesc *fset;
919
920         fset = (struct fileSetDesc *)bh->b_data;
921
922         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
923
924         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
925
926         udf_debug("Rootdir at block=%d, partition=%d\n",
927                   root->logicalBlockNum, root->partitionReferenceNum);
928 }
929
930 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
931 {
932         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
933         return DIV_ROUND_UP(map->s_partition_len +
934                             (sizeof(struct spaceBitmapDesc) << 3),
935                             sb->s_blocksize * 8);
936 }
937
938 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
939 {
940         struct udf_bitmap *bitmap;
941         int nr_groups;
942         int size;
943
944         nr_groups = udf_compute_nr_groups(sb, index);
945         size = sizeof(struct udf_bitmap) +
946                 (sizeof(struct buffer_head *) * nr_groups);
947
948         if (size <= PAGE_SIZE)
949                 bitmap = kzalloc(size, GFP_KERNEL);
950         else
951                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
952
953         if (bitmap == NULL) {
954                 udf_err(sb, "Unable to allocate space for bitmap and %d buffer_head pointers\n",
955                         nr_groups);
956                 return NULL;
957         }
958
959         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
960         bitmap->s_nr_groups = nr_groups;
961         return bitmap;
962 }
963
964 static int udf_fill_partdesc_info(struct super_block *sb,
965                 struct partitionDesc *p, int p_index)
966 {
967         struct udf_part_map *map;
968         struct udf_sb_info *sbi = UDF_SB(sb);
969         struct partitionHeaderDesc *phd;
970
971         map = &sbi->s_partmaps[p_index];
972
973         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
974         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
975
976         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
977                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
978         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
979                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
980         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
981                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
982         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
983                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
984
985         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
986                   p_index, map->s_partition_type,
987                   map->s_partition_root, map->s_partition_len);
988
989         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
990             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
991                 return 0;
992
993         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
994         if (phd->unallocSpaceTable.extLength) {
995                 struct kernel_lb_addr loc = {
996                         .logicalBlockNum = le32_to_cpu(
997                                 phd->unallocSpaceTable.extPosition),
998                         .partitionReferenceNum = p_index,
999                 };
1000
1001                 map->s_uspace.s_table = udf_iget(sb, &loc);
1002                 if (!map->s_uspace.s_table) {
1003                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1004                                   p_index);
1005                         return 1;
1006                 }
1007                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1008                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1009                           p_index, map->s_uspace.s_table->i_ino);
1010         }
1011
1012         if (phd->unallocSpaceBitmap.extLength) {
1013                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1014                 if (!bitmap)
1015                         return 1;
1016                 map->s_uspace.s_bitmap = bitmap;
1017                 bitmap->s_extLength = le32_to_cpu(
1018                                 phd->unallocSpaceBitmap.extLength);
1019                 bitmap->s_extPosition = le32_to_cpu(
1020                                 phd->unallocSpaceBitmap.extPosition);
1021                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1022                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
1023                           p_index, bitmap->s_extPosition);
1024         }
1025
1026         if (phd->partitionIntegrityTable.extLength)
1027                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1028
1029         if (phd->freedSpaceTable.extLength) {
1030                 struct kernel_lb_addr loc = {
1031                         .logicalBlockNum = le32_to_cpu(
1032                                 phd->freedSpaceTable.extPosition),
1033                         .partitionReferenceNum = p_index,
1034                 };
1035
1036                 map->s_fspace.s_table = udf_iget(sb, &loc);
1037                 if (!map->s_fspace.s_table) {
1038                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1039                                   p_index);
1040                         return 1;
1041                 }
1042
1043                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1044                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1045                           p_index, map->s_fspace.s_table->i_ino);
1046         }
1047
1048         if (phd->freedSpaceBitmap.extLength) {
1049                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1050                 if (!bitmap)
1051                         return 1;
1052                 map->s_fspace.s_bitmap = bitmap;
1053                 bitmap->s_extLength = le32_to_cpu(
1054                                 phd->freedSpaceBitmap.extLength);
1055                 bitmap->s_extPosition = le32_to_cpu(
1056                                 phd->freedSpaceBitmap.extPosition);
1057                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1058                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
1059                           p_index, bitmap->s_extPosition);
1060         }
1061         return 0;
1062 }
1063
1064 static void udf_find_vat_block(struct super_block *sb, int p_index,
1065                                int type1_index, sector_t start_block)
1066 {
1067         struct udf_sb_info *sbi = UDF_SB(sb);
1068         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1069         sector_t vat_block;
1070         struct kernel_lb_addr ino;
1071
1072         /*
1073          * VAT file entry is in the last recorded block. Some broken disks have
1074          * it a few blocks before so try a bit harder...
1075          */
1076         ino.partitionReferenceNum = type1_index;
1077         for (vat_block = start_block;
1078              vat_block >= map->s_partition_root &&
1079              vat_block >= start_block - 3 &&
1080              !sbi->s_vat_inode; vat_block--) {
1081                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1082                 sbi->s_vat_inode = udf_iget(sb, &ino);
1083         }
1084 }
1085
1086 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1087 {
1088         struct udf_sb_info *sbi = UDF_SB(sb);
1089         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1090         struct buffer_head *bh = NULL;
1091         struct udf_inode_info *vati;
1092         uint32_t pos;
1093         struct virtualAllocationTable20 *vat20;
1094         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1095
1096         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1097         if (!sbi->s_vat_inode &&
1098             sbi->s_last_block != blocks - 1) {
1099                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
1100                           (unsigned long)sbi->s_last_block,
1101                           (unsigned long)blocks - 1);
1102                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1103         }
1104         if (!sbi->s_vat_inode)
1105                 return 1;
1106
1107         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1108                 map->s_type_specific.s_virtual.s_start_offset = 0;
1109                 map->s_type_specific.s_virtual.s_num_entries =
1110                         (sbi->s_vat_inode->i_size - 36) >> 2;
1111         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1112                 vati = UDF_I(sbi->s_vat_inode);
1113                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1114                         pos = udf_block_map(sbi->s_vat_inode, 0);
1115                         bh = sb_bread(sb, pos);
1116                         if (!bh)
1117                                 return 1;
1118                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1119                 } else {
1120                         vat20 = (struct virtualAllocationTable20 *)
1121                                                         vati->i_ext.i_data;
1122                 }
1123
1124                 map->s_type_specific.s_virtual.s_start_offset =
1125                         le16_to_cpu(vat20->lengthHeader);
1126                 map->s_type_specific.s_virtual.s_num_entries =
1127                         (sbi->s_vat_inode->i_size -
1128                                 map->s_type_specific.s_virtual.
1129                                         s_start_offset) >> 2;
1130                 brelse(bh);
1131         }
1132         return 0;
1133 }
1134
1135 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1136 {
1137         struct buffer_head *bh;
1138         struct partitionDesc *p;
1139         struct udf_part_map *map;
1140         struct udf_sb_info *sbi = UDF_SB(sb);
1141         int i, type1_idx;
1142         uint16_t partitionNumber;
1143         uint16_t ident;
1144         int ret = 0;
1145
1146         bh = udf_read_tagged(sb, block, block, &ident);
1147         if (!bh)
1148                 return 1;
1149         if (ident != TAG_IDENT_PD)
1150                 goto out_bh;
1151
1152         p = (struct partitionDesc *)bh->b_data;
1153         partitionNumber = le16_to_cpu(p->partitionNumber);
1154
1155         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1156         for (i = 0; i < sbi->s_partitions; i++) {
1157                 map = &sbi->s_partmaps[i];
1158                 udf_debug("Searching map: (%d == %d)\n",
1159                           map->s_partition_num, partitionNumber);
1160                 if (map->s_partition_num == partitionNumber &&
1161                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1162                      map->s_partition_type == UDF_SPARABLE_MAP15))
1163                         break;
1164         }
1165
1166         if (i >= sbi->s_partitions) {
1167                 udf_debug("Partition (%d) not found in partition map\n",
1168                           partitionNumber);
1169                 goto out_bh;
1170         }
1171
1172         ret = udf_fill_partdesc_info(sb, p, i);
1173
1174         /*
1175          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1176          * PHYSICAL partitions are already set up
1177          */
1178         type1_idx = i;
1179         for (i = 0; i < sbi->s_partitions; i++) {
1180                 map = &sbi->s_partmaps[i];
1181
1182                 if (map->s_partition_num == partitionNumber &&
1183                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1184                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1185                      map->s_partition_type == UDF_METADATA_MAP25))
1186                         break;
1187         }
1188
1189         if (i >= sbi->s_partitions)
1190                 goto out_bh;
1191
1192         ret = udf_fill_partdesc_info(sb, p, i);
1193         if (ret)
1194                 goto out_bh;
1195
1196         if (map->s_partition_type == UDF_METADATA_MAP25) {
1197                 ret = udf_load_metadata_files(sb, i);
1198                 if (ret) {
1199                         udf_err(sb, "error loading MetaData partition map %d\n",
1200                                 i);
1201                         goto out_bh;
1202                 }
1203         } else {
1204                 ret = udf_load_vat(sb, i, type1_idx);
1205                 if (ret)
1206                         goto out_bh;
1207                 /*
1208                  * Mark filesystem read-only if we have a partition with
1209                  * virtual map since we don't handle writing to it (we
1210                  * overwrite blocks instead of relocating them).
1211                  */
1212                 sb->s_flags |= MS_RDONLY;
1213                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
1214         }
1215 out_bh:
1216         /* In case loading failed, we handle cleanup in udf_fill_super */
1217         brelse(bh);
1218         return ret;
1219 }
1220
1221 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1222                                struct kernel_lb_addr *fileset)
1223 {
1224         struct logicalVolDesc *lvd;
1225         int i, j, offset;
1226         uint8_t type;
1227         struct udf_sb_info *sbi = UDF_SB(sb);
1228         struct genericPartitionMap *gpm;
1229         uint16_t ident;
1230         struct buffer_head *bh;
1231         int ret = 0;
1232
1233         bh = udf_read_tagged(sb, block, block, &ident);
1234         if (!bh)
1235                 return 1;
1236         BUG_ON(ident != TAG_IDENT_LVD);
1237         lvd = (struct logicalVolDesc *)bh->b_data;
1238
1239         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1240         if (i != 0) {
1241                 ret = i;
1242                 goto out_bh;
1243         }
1244
1245         for (i = 0, offset = 0;
1246              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1247              i++, offset += gpm->partitionMapLength) {
1248                 struct udf_part_map *map = &sbi->s_partmaps[i];
1249                 gpm = (struct genericPartitionMap *)
1250                                 &(lvd->partitionMaps[offset]);
1251                 type = gpm->partitionMapType;
1252                 if (type == 1) {
1253                         struct genericPartitionMap1 *gpm1 =
1254                                 (struct genericPartitionMap1 *)gpm;
1255                         map->s_partition_type = UDF_TYPE1_MAP15;
1256                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1257                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1258                         map->s_partition_func = NULL;
1259                 } else if (type == 2) {
1260                         struct udfPartitionMap2 *upm2 =
1261                                                 (struct udfPartitionMap2 *)gpm;
1262                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1263                                                 strlen(UDF_ID_VIRTUAL))) {
1264                                 u16 suf =
1265                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1266                                                         identSuffix)[0]);
1267                                 if (suf < 0x0200) {
1268                                         map->s_partition_type =
1269                                                         UDF_VIRTUAL_MAP15;
1270                                         map->s_partition_func =
1271                                                         udf_get_pblock_virt15;
1272                                 } else {
1273                                         map->s_partition_type =
1274                                                         UDF_VIRTUAL_MAP20;
1275                                         map->s_partition_func =
1276                                                         udf_get_pblock_virt20;
1277                                 }
1278                         } else if (!strncmp(upm2->partIdent.ident,
1279                                                 UDF_ID_SPARABLE,
1280                                                 strlen(UDF_ID_SPARABLE))) {
1281                                 uint32_t loc;
1282                                 struct sparingTable *st;
1283                                 struct sparablePartitionMap *spm =
1284                                         (struct sparablePartitionMap *)gpm;
1285
1286                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1287                                 map->s_type_specific.s_sparing.s_packet_len =
1288                                                 le16_to_cpu(spm->packetLength);
1289                                 for (j = 0; j < spm->numSparingTables; j++) {
1290                                         struct buffer_head *bh2;
1291
1292                                         loc = le32_to_cpu(
1293                                                 spm->locSparingTable[j]);
1294                                         bh2 = udf_read_tagged(sb, loc, loc,
1295                                                              &ident);
1296                                         map->s_type_specific.s_sparing.
1297                                                         s_spar_map[j] = bh2;
1298
1299                                         if (bh2 == NULL)
1300                                                 continue;
1301
1302                                         st = (struct sparingTable *)bh2->b_data;
1303                                         if (ident != 0 || strncmp(
1304                                                 st->sparingIdent.ident,
1305                                                 UDF_ID_SPARING,
1306                                                 strlen(UDF_ID_SPARING))) {
1307                                                 brelse(bh2);
1308                                                 map->s_type_specific.s_sparing.
1309                                                         s_spar_map[j] = NULL;
1310                                         }
1311                                 }
1312                                 map->s_partition_func = udf_get_pblock_spar15;
1313                         } else if (!strncmp(upm2->partIdent.ident,
1314                                                 UDF_ID_METADATA,
1315                                                 strlen(UDF_ID_METADATA))) {
1316                                 struct udf_meta_data *mdata =
1317                                         &map->s_type_specific.s_metadata;
1318                                 struct metadataPartitionMap *mdm =
1319                                                 (struct metadataPartitionMap *)
1320                                                 &(lvd->partitionMaps[offset]);
1321                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
1322                                           i, type, UDF_ID_METADATA);
1323
1324                                 map->s_partition_type = UDF_METADATA_MAP25;
1325                                 map->s_partition_func = udf_get_pblock_meta25;
1326
1327                                 mdata->s_meta_file_loc   =
1328                                         le32_to_cpu(mdm->metadataFileLoc);
1329                                 mdata->s_mirror_file_loc =
1330                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1331                                 mdata->s_bitmap_file_loc =
1332                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1333                                 mdata->s_alloc_unit_size =
1334                                         le32_to_cpu(mdm->allocUnitSize);
1335                                 mdata->s_align_unit_size =
1336                                         le16_to_cpu(mdm->alignUnitSize);
1337                                 if (mdm->flags & 0x01)
1338                                         mdata->s_flags |= MF_DUPLICATE_MD;
1339
1340                                 udf_debug("Metadata Ident suffix=0x%x\n",
1341                                           le16_to_cpu(*(__le16 *)
1342                                                       mdm->partIdent.identSuffix));
1343                                 udf_debug("Metadata part num=%d\n",
1344                                           le16_to_cpu(mdm->partitionNum));
1345                                 udf_debug("Metadata part alloc unit size=%d\n",
1346                                           le32_to_cpu(mdm->allocUnitSize));
1347                                 udf_debug("Metadata file loc=%d\n",
1348                                           le32_to_cpu(mdm->metadataFileLoc));
1349                                 udf_debug("Mirror file loc=%d\n",
1350                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
1351                                 udf_debug("Bitmap file loc=%d\n",
1352                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
1353                                 udf_debug("Flags: %d %d\n",
1354                                           mdata->s_flags, mdm->flags);
1355                         } else {
1356                                 udf_debug("Unknown ident: %s\n",
1357                                           upm2->partIdent.ident);
1358                                 continue;
1359                         }
1360                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1361                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1362                 }
1363                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1364                           i, map->s_partition_num, type, map->s_volumeseqnum);
1365         }
1366
1367         if (fileset) {
1368                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1369
1370                 *fileset = lelb_to_cpu(la->extLocation);
1371                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
1372                           fileset->logicalBlockNum,
1373                           fileset->partitionReferenceNum);
1374         }
1375         if (lvd->integritySeqExt.extLength)
1376                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1377
1378 out_bh:
1379         brelse(bh);
1380         return ret;
1381 }
1382
1383 /*
1384  * udf_load_logicalvolint
1385  *
1386  */
1387 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1388 {
1389         struct buffer_head *bh = NULL;
1390         uint16_t ident;
1391         struct udf_sb_info *sbi = UDF_SB(sb);
1392         struct logicalVolIntegrityDesc *lvid;
1393
1394         while (loc.extLength > 0 &&
1395                (bh = udf_read_tagged(sb, loc.extLocation,
1396                                      loc.extLocation, &ident)) &&
1397                ident == TAG_IDENT_LVID) {
1398                 sbi->s_lvid_bh = bh;
1399                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1400
1401                 if (lvid->nextIntegrityExt.extLength)
1402                         udf_load_logicalvolint(sb,
1403                                 leea_to_cpu(lvid->nextIntegrityExt));
1404
1405                 if (sbi->s_lvid_bh != bh)
1406                         brelse(bh);
1407                 loc.extLength -= sb->s_blocksize;
1408                 loc.extLocation++;
1409         }
1410         if (sbi->s_lvid_bh != bh)
1411                 brelse(bh);
1412 }
1413
1414 /*
1415  * udf_process_sequence
1416  *
1417  * PURPOSE
1418  *      Process a main/reserve volume descriptor sequence.
1419  *
1420  * PRE-CONDITIONS
1421  *      sb                      Pointer to _locked_ superblock.
1422  *      block                   First block of first extent of the sequence.
1423  *      lastblock               Lastblock of first extent of the sequence.
1424  *
1425  * HISTORY
1426  *      July 1, 1997 - Andrew E. Mileski
1427  *      Written, tested, and released.
1428  */
1429 static noinline int udf_process_sequence(struct super_block *sb, long block,
1430                                 long lastblock, struct kernel_lb_addr *fileset)
1431 {
1432         struct buffer_head *bh = NULL;
1433         struct udf_vds_record vds[VDS_POS_LENGTH];
1434         struct udf_vds_record *curr;
1435         struct generic_desc *gd;
1436         struct volDescPtr *vdp;
1437         int done = 0;
1438         uint32_t vdsn;
1439         uint16_t ident;
1440         long next_s = 0, next_e = 0;
1441
1442         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1443
1444         /*
1445          * Read the main descriptor sequence and find which descriptors
1446          * are in it.
1447          */
1448         for (; (!done && block <= lastblock); block++) {
1449
1450                 bh = udf_read_tagged(sb, block, block, &ident);
1451                 if (!bh) {
1452                         udf_err(sb,
1453                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
1454                                 (unsigned long long)block);
1455                         return 1;
1456                 }
1457
1458                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1459                 gd = (struct generic_desc *)bh->b_data;
1460                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1461                 switch (ident) {
1462                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1463                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1464                         if (vdsn >= curr->volDescSeqNum) {
1465                                 curr->volDescSeqNum = vdsn;
1466                                 curr->block = block;
1467                         }
1468                         break;
1469                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1470                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1471                         if (vdsn >= curr->volDescSeqNum) {
1472                                 curr->volDescSeqNum = vdsn;
1473                                 curr->block = block;
1474
1475                                 vdp = (struct volDescPtr *)bh->b_data;
1476                                 next_s = le32_to_cpu(
1477                                         vdp->nextVolDescSeqExt.extLocation);
1478                                 next_e = le32_to_cpu(
1479                                         vdp->nextVolDescSeqExt.extLength);
1480                                 next_e = next_e >> sb->s_blocksize_bits;
1481                                 next_e += next_s;
1482                         }
1483                         break;
1484                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1485                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1486                         if (vdsn >= curr->volDescSeqNum) {
1487                                 curr->volDescSeqNum = vdsn;
1488                                 curr->block = block;
1489                         }
1490                         break;
1491                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1492                         curr = &vds[VDS_POS_PARTITION_DESC];
1493                         if (!curr->block)
1494                                 curr->block = block;
1495                         break;
1496                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1497                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1498                         if (vdsn >= curr->volDescSeqNum) {
1499                                 curr->volDescSeqNum = vdsn;
1500                                 curr->block = block;
1501                         }
1502                         break;
1503                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1504                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1505                         if (vdsn >= curr->volDescSeqNum) {
1506                                 curr->volDescSeqNum = vdsn;
1507                                 curr->block = block;
1508                         }
1509                         break;
1510                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1511                         vds[VDS_POS_TERMINATING_DESC].block = block;
1512                         if (next_e) {
1513                                 block = next_s;
1514                                 lastblock = next_e;
1515                                 next_s = next_e = 0;
1516                         } else
1517                                 done = 1;
1518                         break;
1519                 }
1520                 brelse(bh);
1521         }
1522         /*
1523          * Now read interesting descriptors again and process them
1524          * in a suitable order
1525          */
1526         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1527                 udf_err(sb, "Primary Volume Descriptor not found!\n");
1528                 return 1;
1529         }
1530         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1531                 return 1;
1532
1533         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1534             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1535                 return 1;
1536
1537         if (vds[VDS_POS_PARTITION_DESC].block) {
1538                 /*
1539                  * We rescan the whole descriptor sequence to find
1540                  * partition descriptor blocks and process them.
1541                  */
1542                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1543                      block < vds[VDS_POS_TERMINATING_DESC].block;
1544                      block++)
1545                         if (udf_load_partdesc(sb, block))
1546                                 return 1;
1547         }
1548
1549         return 0;
1550 }
1551
1552 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1553                              struct kernel_lb_addr *fileset)
1554 {
1555         struct anchorVolDescPtr *anchor;
1556         long main_s, main_e, reserve_s, reserve_e;
1557
1558         anchor = (struct anchorVolDescPtr *)bh->b_data;
1559
1560         /* Locate the main sequence */
1561         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1562         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1563         main_e = main_e >> sb->s_blocksize_bits;
1564         main_e += main_s;
1565
1566         /* Locate the reserve sequence */
1567         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1568         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1569         reserve_e = reserve_e >> sb->s_blocksize_bits;
1570         reserve_e += reserve_s;
1571
1572         /* Process the main & reserve sequences */
1573         /* responsible for finding the PartitionDesc(s) */
1574         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1575                 return 1;
1576         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1577 }
1578
1579 /*
1580  * Check whether there is an anchor block in the given block and
1581  * load Volume Descriptor Sequence if so.
1582  */
1583 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1584                                   struct kernel_lb_addr *fileset)
1585 {
1586         struct buffer_head *bh;
1587         uint16_t ident;
1588         int ret;
1589
1590         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1591             udf_fixed_to_variable(block) >=
1592             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1593                 return 0;
1594
1595         bh = udf_read_tagged(sb, block, block, &ident);
1596         if (!bh)
1597                 return 0;
1598         if (ident != TAG_IDENT_AVDP) {
1599                 brelse(bh);
1600                 return 0;
1601         }
1602         ret = udf_load_sequence(sb, bh, fileset);
1603         brelse(bh);
1604         return ret;
1605 }
1606
1607 /* Search for an anchor volume descriptor pointer */
1608 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1609                                  struct kernel_lb_addr *fileset)
1610 {
1611         sector_t last[6];
1612         int i;
1613         struct udf_sb_info *sbi = UDF_SB(sb);
1614         int last_count = 0;
1615
1616         /* First try user provided anchor */
1617         if (sbi->s_anchor) {
1618                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1619                         return lastblock;
1620         }
1621         /*
1622          * according to spec, anchor is in either:
1623          *     block 256
1624          *     lastblock-256
1625          *     lastblock
1626          *  however, if the disc isn't closed, it could be 512.
1627          */
1628         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1629                 return lastblock;
1630         /*
1631          * The trouble is which block is the last one. Drives often misreport
1632          * this so we try various possibilities.
1633          */
1634         last[last_count++] = lastblock;
1635         if (lastblock >= 1)
1636                 last[last_count++] = lastblock - 1;
1637         last[last_count++] = lastblock + 1;
1638         if (lastblock >= 2)
1639                 last[last_count++] = lastblock - 2;
1640         if (lastblock >= 150)
1641                 last[last_count++] = lastblock - 150;
1642         if (lastblock >= 152)
1643                 last[last_count++] = lastblock - 152;
1644
1645         for (i = 0; i < last_count; i++) {
1646                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1647                                 sb->s_blocksize_bits)
1648                         continue;
1649                 if (udf_check_anchor_block(sb, last[i], fileset))
1650                         return last[i];
1651                 if (last[i] < 256)
1652                         continue;
1653                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1654                         return last[i];
1655         }
1656
1657         /* Finally try block 512 in case media is open */
1658         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1659                 return last[0];
1660         return 0;
1661 }
1662
1663 /*
1664  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1665  * area specified by it. The function expects sbi->s_lastblock to be the last
1666  * block on the media.
1667  *
1668  * Return 1 if ok, 0 if not found.
1669  *
1670  */
1671 static int udf_find_anchor(struct super_block *sb,
1672                            struct kernel_lb_addr *fileset)
1673 {
1674         sector_t lastblock;
1675         struct udf_sb_info *sbi = UDF_SB(sb);
1676
1677         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1678         if (lastblock)
1679                 goto out;
1680
1681         /* No anchor found? Try VARCONV conversion of block numbers */
1682         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1683         /* Firstly, we try to not convert number of the last block */
1684         lastblock = udf_scan_anchors(sb,
1685                                 udf_variable_to_fixed(sbi->s_last_block),
1686                                 fileset);
1687         if (lastblock)
1688                 goto out;
1689
1690         /* Secondly, we try with converted number of the last block */
1691         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1692         if (!lastblock) {
1693                 /* VARCONV didn't help. Clear it. */
1694                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1695                 return 0;
1696         }
1697 out:
1698         sbi->s_last_block = lastblock;
1699         return 1;
1700 }
1701
1702 /*
1703  * Check Volume Structure Descriptor, find Anchor block and load Volume
1704  * Descriptor Sequence
1705  */
1706 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1707                         int silent, struct kernel_lb_addr *fileset)
1708 {
1709         struct udf_sb_info *sbi = UDF_SB(sb);
1710         loff_t nsr_off;
1711
1712         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1713                 if (!silent)
1714                         udf_warn(sb, "Bad block size\n");
1715                 return 0;
1716         }
1717         sbi->s_last_block = uopt->lastblock;
1718         if (!uopt->novrs) {
1719                 /* Check that it is NSR02 compliant */
1720                 nsr_off = udf_check_vsd(sb);
1721                 if (!nsr_off) {
1722                         if (!silent)
1723                                 udf_warn(sb, "No VRS found\n");
1724                         return 0;
1725                 }
1726                 if (nsr_off == -1)
1727                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
1728                 if (!sbi->s_last_block)
1729                         sbi->s_last_block = udf_get_last_block(sb);
1730         } else {
1731                 udf_debug("Validity check skipped because of novrs option\n");
1732         }
1733
1734         /* Look for anchor block and load Volume Descriptor Sequence */
1735         sbi->s_anchor = uopt->anchor;
1736         if (!udf_find_anchor(sb, fileset)) {
1737                 if (!silent)
1738                         udf_warn(sb, "No anchor found\n");
1739                 return 0;
1740         }
1741         return 1;
1742 }
1743
1744 static void udf_open_lvid(struct super_block *sb)
1745 {
1746         struct udf_sb_info *sbi = UDF_SB(sb);
1747         struct buffer_head *bh = sbi->s_lvid_bh;
1748         struct logicalVolIntegrityDesc *lvid;
1749         struct logicalVolIntegrityDescImpUse *lvidiu;
1750
1751         if (!bh)
1752                 return;
1753
1754         mutex_lock(&sbi->s_alloc_mutex);
1755         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1756         lvidiu = udf_sb_lvidiu(sbi);
1757
1758         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1759         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1760         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1761                                 CURRENT_TIME);
1762         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
1763
1764         lvid->descTag.descCRC = cpu_to_le16(
1765                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1766                         le16_to_cpu(lvid->descTag.descCRCLength)));
1767
1768         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1769         mark_buffer_dirty(bh);
1770         sbi->s_lvid_dirty = 0;
1771         mutex_unlock(&sbi->s_alloc_mutex);
1772 }
1773
1774 static void udf_close_lvid(struct super_block *sb)
1775 {
1776         struct udf_sb_info *sbi = UDF_SB(sb);
1777         struct buffer_head *bh = sbi->s_lvid_bh;
1778         struct logicalVolIntegrityDesc *lvid;
1779         struct logicalVolIntegrityDescImpUse *lvidiu;
1780
1781         if (!bh)
1782                 return;
1783
1784         mutex_lock(&sbi->s_alloc_mutex);
1785         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1786         lvidiu = udf_sb_lvidiu(sbi);
1787         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1788         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1789         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1790         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1791                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1792         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1793                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1794         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1795                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1796         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1797
1798         lvid->descTag.descCRC = cpu_to_le16(
1799                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1800                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1801
1802         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1803         /*
1804          * We set buffer uptodate unconditionally here to avoid spurious
1805          * warnings from mark_buffer_dirty() when previous EIO has marked
1806          * the buffer as !uptodate
1807          */
1808         set_buffer_uptodate(bh);
1809         mark_buffer_dirty(bh);
1810         sbi->s_lvid_dirty = 0;
1811         mutex_unlock(&sbi->s_alloc_mutex);
1812 }
1813
1814 u64 lvid_get_unique_id(struct super_block *sb)
1815 {
1816         struct buffer_head *bh;
1817         struct udf_sb_info *sbi = UDF_SB(sb);
1818         struct logicalVolIntegrityDesc *lvid;
1819         struct logicalVolHeaderDesc *lvhd;
1820         u64 uniqueID;
1821         u64 ret;
1822
1823         bh = sbi->s_lvid_bh;
1824         if (!bh)
1825                 return 0;
1826
1827         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1828         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
1829
1830         mutex_lock(&sbi->s_alloc_mutex);
1831         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
1832         if (!(++uniqueID & 0xFFFFFFFF))
1833                 uniqueID += 16;
1834         lvhd->uniqueID = cpu_to_le64(uniqueID);
1835         mutex_unlock(&sbi->s_alloc_mutex);
1836         mark_buffer_dirty(bh);
1837
1838         return ret;
1839 }
1840
1841 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1842 {
1843         int i;
1844         int nr_groups = bitmap->s_nr_groups;
1845         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1846                                                 nr_groups);
1847
1848         for (i = 0; i < nr_groups; i++)
1849                 if (bitmap->s_block_bitmap[i])
1850                         brelse(bitmap->s_block_bitmap[i]);
1851
1852         if (size <= PAGE_SIZE)
1853                 kfree(bitmap);
1854         else
1855                 vfree(bitmap);
1856 }
1857
1858 static void udf_free_partition(struct udf_part_map *map)
1859 {
1860         int i;
1861         struct udf_meta_data *mdata;
1862
1863         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1864                 iput(map->s_uspace.s_table);
1865         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1866                 iput(map->s_fspace.s_table);
1867         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1868                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1869         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1870                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1871         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1872                 for (i = 0; i < 4; i++)
1873                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1874         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1875                 mdata = &map->s_type_specific.s_metadata;
1876                 iput(mdata->s_metadata_fe);
1877                 mdata->s_metadata_fe = NULL;
1878
1879                 iput(mdata->s_mirror_fe);
1880                 mdata->s_mirror_fe = NULL;
1881
1882                 iput(mdata->s_bitmap_fe);
1883                 mdata->s_bitmap_fe = NULL;
1884         }
1885 }
1886
1887 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1888 {
1889         int i;
1890         int ret;
1891         struct inode *inode = NULL;
1892         struct udf_options uopt;
1893         struct kernel_lb_addr rootdir, fileset;
1894         struct udf_sb_info *sbi;
1895
1896         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1897         uopt.uid = -1;
1898         uopt.gid = -1;
1899         uopt.umask = 0;
1900         uopt.fmode = UDF_INVALID_MODE;
1901         uopt.dmode = UDF_INVALID_MODE;
1902
1903         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1904         if (!sbi)
1905                 return -ENOMEM;
1906
1907         sb->s_fs_info = sbi;
1908
1909         mutex_init(&sbi->s_alloc_mutex);
1910
1911         if (!udf_parse_options((char *)options, &uopt, false))
1912                 goto error_out;
1913
1914         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1915             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1916                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
1917                 goto error_out;
1918         }
1919 #ifdef CONFIG_UDF_NLS
1920         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1921                 uopt.nls_map = load_nls_default();
1922                 if (!uopt.nls_map)
1923                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1924                 else
1925                         udf_debug("Using default NLS map\n");
1926         }
1927 #endif
1928         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1929                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1930
1931         fileset.logicalBlockNum = 0xFFFFFFFF;
1932         fileset.partitionReferenceNum = 0xFFFF;
1933
1934         sbi->s_flags = uopt.flags;
1935         sbi->s_uid = uopt.uid;
1936         sbi->s_gid = uopt.gid;
1937         sbi->s_umask = uopt.umask;
1938         sbi->s_fmode = uopt.fmode;
1939         sbi->s_dmode = uopt.dmode;
1940         sbi->s_nls_map = uopt.nls_map;
1941         rwlock_init(&sbi->s_cred_lock);
1942
1943         if (uopt.session == 0xFFFFFFFF)
1944                 sbi->s_session = udf_get_last_session(sb);
1945         else
1946                 sbi->s_session = uopt.session;
1947
1948         udf_debug("Multi-session=%d\n", sbi->s_session);
1949
1950         /* Fill in the rest of the superblock */
1951         sb->s_op = &udf_sb_ops;
1952         sb->s_export_op = &udf_export_ops;
1953
1954         sb->s_dirt = 0;
1955         sb->s_magic = UDF_SUPER_MAGIC;
1956         sb->s_time_gran = 1000;
1957
1958         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1959                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1960         } else {
1961                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1962                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1963                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1964                         if (!silent)
1965                                 pr_notice("Rescanning with blocksize %d\n",
1966                                           UDF_DEFAULT_BLOCKSIZE);
1967                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1968                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1969                 }
1970         }
1971         if (!ret) {
1972                 udf_warn(sb, "No partition found (1)\n");
1973                 goto error_out;
1974         }
1975
1976         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1977
1978         if (sbi->s_lvid_bh) {
1979                 struct logicalVolIntegrityDescImpUse *lvidiu =
1980                                                         udf_sb_lvidiu(sbi);
1981                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1982                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1983                 /* uint16_t maxUDFWriteRev =
1984                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1985
1986                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1987                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
1988                                 le16_to_cpu(lvidiu->minUDFReadRev),
1989                                 UDF_MAX_READ_VERSION);
1990                         goto error_out;
1991                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1992                         sb->s_flags |= MS_RDONLY;
1993
1994                 sbi->s_udfrev = minUDFWriteRev;
1995
1996                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1997                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1998                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1999                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
2000         }
2001
2002         if (!sbi->s_partitions) {
2003                 udf_warn(sb, "No partition found (2)\n");
2004                 goto error_out;
2005         }
2006
2007         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
2008                         UDF_PART_FLAG_READ_ONLY) {
2009                 pr_notice("Partition marked readonly; forcing readonly mount\n");
2010                 sb->s_flags |= MS_RDONLY;
2011         }
2012
2013         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2014                 udf_warn(sb, "No fileset found\n");
2015                 goto error_out;
2016         }
2017
2018         if (!silent) {
2019                 struct timestamp ts;
2020                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2021                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2022                          sbi->s_volume_ident,
2023                          le16_to_cpu(ts.year), ts.month, ts.day,
2024                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2025         }
2026         if (!(sb->s_flags & MS_RDONLY))
2027                 udf_open_lvid(sb);
2028
2029         /* Assign the root inode */
2030         /* assign inodes by physical block number */
2031         /* perhaps it's not extensible enough, but for now ... */
2032         inode = udf_iget(sb, &rootdir);
2033         if (!inode) {
2034                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
2035                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2036                 goto error_out;
2037         }
2038
2039         /* Allocate a dentry for the root inode */
2040         sb->s_root = d_make_root(inode);
2041         if (!sb->s_root) {
2042                 udf_err(sb, "Couldn't allocate root dentry\n");
2043                 goto error_out;
2044         }
2045         sb->s_maxbytes = MAX_LFS_FILESIZE;
2046         sb->s_max_links = UDF_MAX_LINKS;
2047         return 0;
2048
2049 error_out:
2050         if (sbi->s_vat_inode)
2051                 iput(sbi->s_vat_inode);
2052         if (sbi->s_partitions)
2053                 for (i = 0; i < sbi->s_partitions; i++)
2054                         udf_free_partition(&sbi->s_partmaps[i]);
2055 #ifdef CONFIG_UDF_NLS
2056         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2057                 unload_nls(sbi->s_nls_map);
2058 #endif
2059         if (!(sb->s_flags & MS_RDONLY))
2060                 udf_close_lvid(sb);
2061         brelse(sbi->s_lvid_bh);
2062
2063         kfree(sbi->s_partmaps);
2064         kfree(sbi);
2065         sb->s_fs_info = NULL;
2066
2067         return -EINVAL;
2068 }
2069
2070 void _udf_err(struct super_block *sb, const char *function,
2071               const char *fmt, ...)
2072 {
2073         struct va_format vaf;
2074         va_list args;
2075
2076         /* mark sb error */
2077         if (!(sb->s_flags & MS_RDONLY))
2078                 sb->s_dirt = 1;
2079
2080         va_start(args, fmt);
2081
2082         vaf.fmt = fmt;
2083         vaf.va = &args;
2084
2085         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
2086
2087         va_end(args);
2088 }
2089
2090 void _udf_warn(struct super_block *sb, const char *function,
2091                const char *fmt, ...)
2092 {
2093         struct va_format vaf;
2094         va_list args;
2095
2096         va_start(args, fmt);
2097
2098         vaf.fmt = fmt;
2099         vaf.va = &args;
2100
2101         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
2102
2103         va_end(args);
2104 }
2105
2106 static void udf_put_super(struct super_block *sb)
2107 {
2108         int i;
2109         struct udf_sb_info *sbi;
2110
2111         sbi = UDF_SB(sb);
2112
2113         if (sbi->s_vat_inode)
2114                 iput(sbi->s_vat_inode);
2115         if (sbi->s_partitions)
2116                 for (i = 0; i < sbi->s_partitions; i++)
2117                         udf_free_partition(&sbi->s_partmaps[i]);
2118 #ifdef CONFIG_UDF_NLS
2119         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2120                 unload_nls(sbi->s_nls_map);
2121 #endif
2122         if (!(sb->s_flags & MS_RDONLY))
2123                 udf_close_lvid(sb);
2124         brelse(sbi->s_lvid_bh);
2125         kfree(sbi->s_partmaps);
2126         kfree(sb->s_fs_info);
2127         sb->s_fs_info = NULL;
2128 }
2129
2130 static int udf_sync_fs(struct super_block *sb, int wait)
2131 {
2132         struct udf_sb_info *sbi = UDF_SB(sb);
2133
2134         mutex_lock(&sbi->s_alloc_mutex);
2135         if (sbi->s_lvid_dirty) {
2136                 /*
2137                  * Blockdevice will be synced later so we don't have to submit
2138                  * the buffer for IO
2139                  */
2140                 mark_buffer_dirty(sbi->s_lvid_bh);
2141                 sb->s_dirt = 0;
2142                 sbi->s_lvid_dirty = 0;
2143         }
2144         mutex_unlock(&sbi->s_alloc_mutex);
2145
2146         return 0;
2147 }
2148
2149 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
2150 {
2151         struct super_block *sb = dentry->d_sb;
2152         struct udf_sb_info *sbi = UDF_SB(sb);
2153         struct logicalVolIntegrityDescImpUse *lvidiu;
2154         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
2155
2156         if (sbi->s_lvid_bh != NULL)
2157                 lvidiu = udf_sb_lvidiu(sbi);
2158         else
2159                 lvidiu = NULL;
2160
2161         buf->f_type = UDF_SUPER_MAGIC;
2162         buf->f_bsize = sb->s_blocksize;
2163         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
2164         buf->f_bfree = udf_count_free(sb);
2165         buf->f_bavail = buf->f_bfree;
2166         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
2167                                           le32_to_cpu(lvidiu->numDirs)) : 0)
2168                         + buf->f_bfree;
2169         buf->f_ffree = buf->f_bfree;
2170         buf->f_namelen = UDF_NAME_LEN - 2;
2171         buf->f_fsid.val[0] = (u32)id;
2172         buf->f_fsid.val[1] = (u32)(id >> 32);
2173
2174         return 0;
2175 }
2176
2177 static unsigned int udf_count_free_bitmap(struct super_block *sb,
2178                                           struct udf_bitmap *bitmap)
2179 {
2180         struct buffer_head *bh = NULL;
2181         unsigned int accum = 0;
2182         int index;
2183         int block = 0, newblock;
2184         struct kernel_lb_addr loc;
2185         uint32_t bytes;
2186         uint8_t *ptr;
2187         uint16_t ident;
2188         struct spaceBitmapDesc *bm;
2189
2190         loc.logicalBlockNum = bitmap->s_extPosition;
2191         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2192         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2193
2194         if (!bh) {
2195                 udf_err(sb, "udf_count_free failed\n");
2196                 goto out;
2197         } else if (ident != TAG_IDENT_SBD) {
2198                 brelse(bh);
2199                 udf_err(sb, "udf_count_free failed\n");
2200                 goto out;
2201         }
2202
2203         bm = (struct spaceBitmapDesc *)bh->b_data;
2204         bytes = le32_to_cpu(bm->numOfBytes);
2205         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2206         ptr = (uint8_t *)bh->b_data;
2207
2208         while (bytes > 0) {
2209                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2210                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2211                                         cur_bytes * 8);
2212                 bytes -= cur_bytes;
2213                 if (bytes) {
2214                         brelse(bh);
2215                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2216                         bh = udf_tread(sb, newblock);
2217                         if (!bh) {
2218                                 udf_debug("read failed\n");
2219                                 goto out;
2220                         }
2221                         index = 0;
2222                         ptr = (uint8_t *)bh->b_data;
2223                 }
2224         }
2225         brelse(bh);
2226 out:
2227         return accum;
2228 }
2229
2230 static unsigned int udf_count_free_table(struct super_block *sb,
2231                                          struct inode *table)
2232 {
2233         unsigned int accum = 0;
2234         uint32_t elen;
2235         struct kernel_lb_addr eloc;
2236         int8_t etype;
2237         struct extent_position epos;
2238
2239         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
2240         epos.block = UDF_I(table)->i_location;
2241         epos.offset = sizeof(struct unallocSpaceEntry);
2242         epos.bh = NULL;
2243
2244         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2245                 accum += (elen >> table->i_sb->s_blocksize_bits);
2246
2247         brelse(epos.bh);
2248         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
2249
2250         return accum;
2251 }
2252
2253 static unsigned int udf_count_free(struct super_block *sb)
2254 {
2255         unsigned int accum = 0;
2256         struct udf_sb_info *sbi;
2257         struct udf_part_map *map;
2258
2259         sbi = UDF_SB(sb);
2260         if (sbi->s_lvid_bh) {
2261                 struct logicalVolIntegrityDesc *lvid =
2262                         (struct logicalVolIntegrityDesc *)
2263                         sbi->s_lvid_bh->b_data;
2264                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2265                         accum = le32_to_cpu(
2266                                         lvid->freeSpaceTable[sbi->s_partition]);
2267                         if (accum == 0xFFFFFFFF)
2268                                 accum = 0;
2269                 }
2270         }
2271
2272         if (accum)
2273                 return accum;
2274
2275         map = &sbi->s_partmaps[sbi->s_partition];
2276         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2277                 accum += udf_count_free_bitmap(sb,
2278                                                map->s_uspace.s_bitmap);
2279         }
2280         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2281                 accum += udf_count_free_bitmap(sb,
2282                                                map->s_fspace.s_bitmap);
2283         }
2284         if (accum)
2285                 return accum;
2286
2287         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2288                 accum += udf_count_free_table(sb,
2289                                               map->s_uspace.s_table);
2290         }
2291         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2292                 accum += udf_count_free_table(sb,
2293                                               map->s_fspace.s_table);
2294         }
2295
2296         return accum;
2297 }