udf: Move processing of virtual partitions
[linux-3.10.git] / fs / udf / super.c
1 /*
2  * super.c
3  *
4  * PURPOSE
5  *  Super block routines for the OSTA-UDF(tm) filesystem.
6  *
7  * DESCRIPTION
8  *  OSTA-UDF(tm) = Optical Storage Technology Association
9  *  Universal Disk Format.
10  *
11  *  This code is based on version 2.00 of the UDF specification,
12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
13  *    http://www.osta.org/
14  *    http://www.ecma.ch/
15  *    http://www.iso.org/
16  *
17  * COPYRIGHT
18  *  This file is distributed under the terms of the GNU General Public
19  *  License (GPL). Copies of the GPL can be obtained from:
20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
21  *  Each contributing author retains all rights to their own work.
22  *
23  *  (C) 1998 Dave Boynton
24  *  (C) 1998-2004 Ben Fennema
25  *  (C) 2000 Stelias Computing Inc
26  *
27  * HISTORY
28  *
29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
30  *                added some debugging.
31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
32  *  10/16/98      attempting some multi-session support
33  *  10/17/98      added freespace count for "df"
34  *  11/11/98 gr   added novrs option
35  *  11/26/98 dgb  added fileset,anchor mount options
36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
37  *                vol descs. rewrote option handling based on isofs
38  *  12/20/98      find the free space bitmap (if it exists)
39  */
40
41 #include "udfdecl.h"
42
43 #include <linux/blkdev.h>
44 #include <linux/slab.h>
45 #include <linux/kernel.h>
46 #include <linux/module.h>
47 #include <linux/parser.h>
48 #include <linux/stat.h>
49 #include <linux/cdrom.h>
50 #include <linux/nls.h>
51 #include <linux/smp_lock.h>
52 #include <linux/buffer_head.h>
53 #include <linux/vfs.h>
54 #include <linux/vmalloc.h>
55 #include <linux/errno.h>
56 #include <linux/mount.h>
57 #include <linux/seq_file.h>
58 #include <linux/bitmap.h>
59 #include <asm/byteorder.h>
60
61 #include "udf_sb.h"
62 #include "udf_i.h"
63
64 #include <linux/init.h>
65 #include <asm/uaccess.h>
66
67 #define VDS_POS_PRIMARY_VOL_DESC        0
68 #define VDS_POS_UNALLOC_SPACE_DESC      1
69 #define VDS_POS_LOGICAL_VOL_DESC        2
70 #define VDS_POS_PARTITION_DESC          3
71 #define VDS_POS_IMP_USE_VOL_DESC        4
72 #define VDS_POS_VOL_DESC_PTR            5
73 #define VDS_POS_TERMINATING_DESC        6
74 #define VDS_POS_LENGTH                  7
75
76 #define UDF_DEFAULT_BLOCKSIZE 2048
77
78 static char error_buf[1024];
79
80 /* These are the "meat" - everything else is stuffing */
81 static int udf_fill_super(struct super_block *, void *, int);
82 static void udf_put_super(struct super_block *);
83 static void udf_write_super(struct super_block *);
84 static int udf_remount_fs(struct super_block *, int *, char *);
85 static int udf_check_valid(struct super_block *, int, int);
86 static int udf_vrs(struct super_block *sb, int silent);
87 static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
88 static void udf_find_anchor(struct super_block *);
89 static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
90                             kernel_lb_addr *);
91 static void udf_load_fileset(struct super_block *, struct buffer_head *,
92                              kernel_lb_addr *);
93 static void udf_open_lvid(struct super_block *);
94 static void udf_close_lvid(struct super_block *);
95 static unsigned int udf_count_free(struct super_block *);
96 static int udf_statfs(struct dentry *, struct kstatfs *);
97 static int udf_show_options(struct seq_file *, struct vfsmount *);
98 static void udf_error(struct super_block *sb, const char *function,
99                       const char *fmt, ...);
100
101 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
102 {
103         struct logicalVolIntegrityDesc *lvid =
104                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
105         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
106         __u32 offset = number_of_partitions * 2 *
107                                 sizeof(uint32_t)/sizeof(uint8_t);
108         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
109 }
110
111 /* UDF filesystem type */
112 static int udf_get_sb(struct file_system_type *fs_type,
113                       int flags, const char *dev_name, void *data,
114                       struct vfsmount *mnt)
115 {
116         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
117 }
118
119 static struct file_system_type udf_fstype = {
120         .owner          = THIS_MODULE,
121         .name           = "udf",
122         .get_sb         = udf_get_sb,
123         .kill_sb        = kill_block_super,
124         .fs_flags       = FS_REQUIRES_DEV,
125 };
126
127 static struct kmem_cache *udf_inode_cachep;
128
129 static struct inode *udf_alloc_inode(struct super_block *sb)
130 {
131         struct udf_inode_info *ei;
132         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
133         if (!ei)
134                 return NULL;
135
136         ei->i_unique = 0;
137         ei->i_lenExtents = 0;
138         ei->i_next_alloc_block = 0;
139         ei->i_next_alloc_goal = 0;
140         ei->i_strat4096 = 0;
141
142         return &ei->vfs_inode;
143 }
144
145 static void udf_destroy_inode(struct inode *inode)
146 {
147         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
148 }
149
150 static void init_once(struct kmem_cache *cachep, void *foo)
151 {
152         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
153
154         ei->i_ext.i_data = NULL;
155         inode_init_once(&ei->vfs_inode);
156 }
157
158 static int init_inodecache(void)
159 {
160         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
161                                              sizeof(struct udf_inode_info),
162                                              0, (SLAB_RECLAIM_ACCOUNT |
163                                                  SLAB_MEM_SPREAD),
164                                              init_once);
165         if (!udf_inode_cachep)
166                 return -ENOMEM;
167         return 0;
168 }
169
170 static void destroy_inodecache(void)
171 {
172         kmem_cache_destroy(udf_inode_cachep);
173 }
174
175 /* Superblock operations */
176 static const struct super_operations udf_sb_ops = {
177         .alloc_inode    = udf_alloc_inode,
178         .destroy_inode  = udf_destroy_inode,
179         .write_inode    = udf_write_inode,
180         .delete_inode   = udf_delete_inode,
181         .clear_inode    = udf_clear_inode,
182         .put_super      = udf_put_super,
183         .write_super    = udf_write_super,
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         mode_t umask;
201         gid_t gid;
202         uid_t uid;
203         struct nls_table *nls_map;
204 };
205
206 static int __init init_udf_fs(void)
207 {
208         int err;
209
210         err = init_inodecache();
211         if (err)
212                 goto out1;
213         err = register_filesystem(&udf_fstype);
214         if (err)
215                 goto out;
216
217         return 0;
218
219 out:
220         destroy_inodecache();
221
222 out1:
223         return err;
224 }
225
226 static void __exit exit_udf_fs(void)
227 {
228         unregister_filesystem(&udf_fstype);
229         destroy_inodecache();
230 }
231
232 module_init(init_udf_fs)
233 module_exit(exit_udf_fs)
234
235 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
236 {
237         struct udf_sb_info *sbi = UDF_SB(sb);
238
239         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
240                                   GFP_KERNEL);
241         if (!sbi->s_partmaps) {
242                 udf_error(sb, __FUNCTION__,
243                           "Unable to allocate space for %d partition maps",
244                           count);
245                 sbi->s_partitions = 0;
246                 return -ENOMEM;
247         }
248
249         sbi->s_partitions = count;
250         return 0;
251 }
252
253 static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
254 {
255         struct super_block *sb = mnt->mnt_sb;
256         struct udf_sb_info *sbi = UDF_SB(sb);
257
258         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
259                 seq_puts(seq, ",nostrict");
260         if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
261                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
262         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
263                 seq_puts(seq, ",unhide");
264         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
265                 seq_puts(seq, ",undelete");
266         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
267                 seq_puts(seq, ",noadinicb");
268         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
269                 seq_puts(seq, ",shortad");
270         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
271                 seq_puts(seq, ",uid=forget");
272         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
273                 seq_puts(seq, ",uid=ignore");
274         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
275                 seq_puts(seq, ",gid=forget");
276         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
277                 seq_puts(seq, ",gid=ignore");
278         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
279                 seq_printf(seq, ",uid=%u", sbi->s_uid);
280         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
281                 seq_printf(seq, ",gid=%u", sbi->s_gid);
282         if (sbi->s_umask != 0)
283                 seq_printf(seq, ",umask=%o", sbi->s_umask);
284         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
285                 seq_printf(seq, ",session=%u", sbi->s_session);
286         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
287                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
288         /*
289          * s_anchor[2] could be zeroed out in case there is no anchor
290          * in the specified block, but then the "anchor=N" option
291          * originally given by the user wasn't effective, so it's OK
292          * if we don't show it.
293          */
294         if (sbi->s_anchor[2] != 0)
295                 seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
296         /*
297          * volume, partition, fileset and rootdir seem to be ignored
298          * currently
299          */
300         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
301                 seq_puts(seq, ",utf8");
302         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
303                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
304
305         return 0;
306 }
307
308 /*
309  * udf_parse_options
310  *
311  * PURPOSE
312  *      Parse mount options.
313  *
314  * DESCRIPTION
315  *      The following mount options are supported:
316  *
317  *      gid=            Set the default group.
318  *      umask=          Set the default umask.
319  *      uid=            Set the default user.
320  *      bs=             Set the block size.
321  *      unhide          Show otherwise hidden files.
322  *      undelete        Show deleted files in lists.
323  *      adinicb         Embed data in the inode (default)
324  *      noadinicb       Don't embed data in the inode
325  *      shortad         Use short ad's
326  *      longad          Use long ad's (default)
327  *      nostrict        Unset strict conformance
328  *      iocharset=      Set the NLS character set
329  *
330  *      The remaining are for debugging and disaster recovery:
331  *
332  *      novrs           Skip volume sequence recognition
333  *
334  *      The following expect a offset from 0.
335  *
336  *      session=        Set the CDROM session (default= last session)
337  *      anchor=         Override standard anchor location. (default= 256)
338  *      volume=         Override the VolumeDesc location. (unused)
339  *      partition=      Override the PartitionDesc location. (unused)
340  *      lastblock=      Set the last block of the filesystem/
341  *
342  *      The following expect a offset from the partition root.
343  *
344  *      fileset=        Override the fileset block location. (unused)
345  *      rootdir=        Override the root directory location. (unused)
346  *              WARNING: overriding the rootdir to a non-directory may
347  *              yield highly unpredictable results.
348  *
349  * PRE-CONDITIONS
350  *      options         Pointer to mount options string.
351  *      uopts           Pointer to mount options variable.
352  *
353  * POST-CONDITIONS
354  *      <return>        1       Mount options parsed okay.
355  *      <return>        0       Error parsing mount options.
356  *
357  * HISTORY
358  *      July 1, 1997 - Andrew E. Mileski
359  *      Written, tested, and released.
360  */
361
362 enum {
363         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
364         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
365         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
366         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
367         Opt_rootdir, Opt_utf8, Opt_iocharset,
368         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
369 };
370
371 static match_table_t tokens = {
372         {Opt_novrs,     "novrs"},
373         {Opt_nostrict,  "nostrict"},
374         {Opt_bs,        "bs=%u"},
375         {Opt_unhide,    "unhide"},
376         {Opt_undelete,  "undelete"},
377         {Opt_noadinicb, "noadinicb"},
378         {Opt_adinicb,   "adinicb"},
379         {Opt_shortad,   "shortad"},
380         {Opt_longad,    "longad"},
381         {Opt_uforget,   "uid=forget"},
382         {Opt_uignore,   "uid=ignore"},
383         {Opt_gforget,   "gid=forget"},
384         {Opt_gignore,   "gid=ignore"},
385         {Opt_gid,       "gid=%u"},
386         {Opt_uid,       "uid=%u"},
387         {Opt_umask,     "umask=%o"},
388         {Opt_session,   "session=%u"},
389         {Opt_lastblock, "lastblock=%u"},
390         {Opt_anchor,    "anchor=%u"},
391         {Opt_volume,    "volume=%u"},
392         {Opt_partition, "partition=%u"},
393         {Opt_fileset,   "fileset=%u"},
394         {Opt_rootdir,   "rootdir=%u"},
395         {Opt_utf8,      "utf8"},
396         {Opt_iocharset, "iocharset=%s"},
397         {Opt_err,       NULL}
398 };
399
400 static int udf_parse_options(char *options, struct udf_options *uopt,
401                              bool remount)
402 {
403         char *p;
404         int option;
405
406         uopt->novrs = 0;
407         uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
408         uopt->partition = 0xFFFF;
409         uopt->session = 0xFFFFFFFF;
410         uopt->lastblock = 0;
411         uopt->anchor = 0;
412         uopt->volume = 0xFFFFFFFF;
413         uopt->rootdir = 0xFFFFFFFF;
414         uopt->fileset = 0xFFFFFFFF;
415         uopt->nls_map = NULL;
416
417         if (!options)
418                 return 1;
419
420         while ((p = strsep(&options, ",")) != NULL) {
421                 substring_t args[MAX_OPT_ARGS];
422                 int token;
423                 if (!*p)
424                         continue;
425
426                 token = match_token(p, tokens, args);
427                 switch (token) {
428                 case Opt_novrs:
429                         uopt->novrs = 1;
430                 case Opt_bs:
431                         if (match_int(&args[0], &option))
432                                 return 0;
433                         uopt->blocksize = option;
434                         break;
435                 case Opt_unhide:
436                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
437                         break;
438                 case Opt_undelete:
439                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
440                         break;
441                 case Opt_noadinicb:
442                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
443                         break;
444                 case Opt_adinicb:
445                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
446                         break;
447                 case Opt_shortad:
448                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
449                         break;
450                 case Opt_longad:
451                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
452                         break;
453                 case Opt_gid:
454                         if (match_int(args, &option))
455                                 return 0;
456                         uopt->gid = option;
457                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
458                         break;
459                 case Opt_uid:
460                         if (match_int(args, &option))
461                                 return 0;
462                         uopt->uid = option;
463                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
464                         break;
465                 case Opt_umask:
466                         if (match_octal(args, &option))
467                                 return 0;
468                         uopt->umask = option;
469                         break;
470                 case Opt_nostrict:
471                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
472                         break;
473                 case Opt_session:
474                         if (match_int(args, &option))
475                                 return 0;
476                         uopt->session = option;
477                         if (!remount)
478                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
479                         break;
480                 case Opt_lastblock:
481                         if (match_int(args, &option))
482                                 return 0;
483                         uopt->lastblock = option;
484                         if (!remount)
485                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
486                         break;
487                 case Opt_anchor:
488                         if (match_int(args, &option))
489                                 return 0;
490                         uopt->anchor = option;
491                         break;
492                 case Opt_volume:
493                         if (match_int(args, &option))
494                                 return 0;
495                         uopt->volume = option;
496                         break;
497                 case Opt_partition:
498                         if (match_int(args, &option))
499                                 return 0;
500                         uopt->partition = option;
501                         break;
502                 case Opt_fileset:
503                         if (match_int(args, &option))
504                                 return 0;
505                         uopt->fileset = option;
506                         break;
507                 case Opt_rootdir:
508                         if (match_int(args, &option))
509                                 return 0;
510                         uopt->rootdir = option;
511                         break;
512                 case Opt_utf8:
513                         uopt->flags |= (1 << UDF_FLAG_UTF8);
514                         break;
515 #ifdef CONFIG_UDF_NLS
516                 case Opt_iocharset:
517                         uopt->nls_map = load_nls(args[0].from);
518                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
519                         break;
520 #endif
521                 case Opt_uignore:
522                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
523                         break;
524                 case Opt_uforget:
525                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
526                         break;
527                 case Opt_gignore:
528                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
529                         break;
530                 case Opt_gforget:
531                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
532                         break;
533                 default:
534                         printk(KERN_ERR "udf: bad mount option \"%s\" "
535                                "or missing value\n", p);
536                         return 0;
537                 }
538         }
539         return 1;
540 }
541
542 static void udf_write_super(struct super_block *sb)
543 {
544         lock_kernel();
545
546         if (!(sb->s_flags & MS_RDONLY))
547                 udf_open_lvid(sb);
548         sb->s_dirt = 0;
549
550         unlock_kernel();
551 }
552
553 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
554 {
555         struct udf_options uopt;
556         struct udf_sb_info *sbi = UDF_SB(sb);
557
558         uopt.flags = sbi->s_flags;
559         uopt.uid   = sbi->s_uid;
560         uopt.gid   = sbi->s_gid;
561         uopt.umask = sbi->s_umask;
562
563         if (!udf_parse_options(options, &uopt, true))
564                 return -EINVAL;
565
566         sbi->s_flags = uopt.flags;
567         sbi->s_uid   = uopt.uid;
568         sbi->s_gid   = uopt.gid;
569         sbi->s_umask = uopt.umask;
570
571         if (sbi->s_lvid_bh) {
572                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
573                 if (write_rev > UDF_MAX_WRITE_VERSION)
574                         *flags |= MS_RDONLY;
575         }
576
577         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
578                 return 0;
579         if (*flags & MS_RDONLY)
580                 udf_close_lvid(sb);
581         else
582                 udf_open_lvid(sb);
583
584         return 0;
585 }
586
587 static int udf_vrs(struct super_block *sb, int silent)
588 {
589         struct volStructDesc *vsd = NULL;
590         int sector = 32768;
591         int sectorsize;
592         struct buffer_head *bh = NULL;
593         int iso9660 = 0;
594         int nsr02 = 0;
595         int nsr03 = 0;
596         struct udf_sb_info *sbi;
597
598         /* Block size must be a multiple of 512 */
599         if (sb->s_blocksize & 511)
600                 return 0;
601         sbi = UDF_SB(sb);
602
603         if (sb->s_blocksize < sizeof(struct volStructDesc))
604                 sectorsize = sizeof(struct volStructDesc);
605         else
606                 sectorsize = sb->s_blocksize;
607
608         sector += (sbi->s_session << sb->s_blocksize_bits);
609
610         udf_debug("Starting at sector %u (%ld byte sectors)\n",
611                   (sector >> sb->s_blocksize_bits), sb->s_blocksize);
612         /* Process the sequence (if applicable) */
613         for (; !nsr02 && !nsr03; sector += sectorsize) {
614                 /* Read a block */
615                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
616                 if (!bh)
617                         break;
618
619                 /* Look for ISO  descriptors */
620                 vsd = (struct volStructDesc *)(bh->b_data +
621                                               (sector & (sb->s_blocksize - 1)));
622
623                 if (vsd->stdIdent[0] == 0) {
624                         brelse(bh);
625                         break;
626                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
627                                     VSD_STD_ID_LEN)) {
628                         iso9660 = sector;
629                         switch (vsd->structType) {
630                         case 0:
631                                 udf_debug("ISO9660 Boot Record found\n");
632                                 break;
633                         case 1:
634                                 udf_debug("ISO9660 Primary Volume Descriptor "
635                                           "found\n");
636                                 break;
637                         case 2:
638                                 udf_debug("ISO9660 Supplementary Volume "
639                                           "Descriptor found\n");
640                                 break;
641                         case 3:
642                                 udf_debug("ISO9660 Volume Partition Descriptor "
643                                           "found\n");
644                                 break;
645                         case 255:
646                                 udf_debug("ISO9660 Volume Descriptor Set "
647                                           "Terminator found\n");
648                                 break;
649                         default:
650                                 udf_debug("ISO9660 VRS (%u) found\n",
651                                           vsd->structType);
652                                 break;
653                         }
654                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
655                                     VSD_STD_ID_LEN))
656                         ; /* nothing */
657                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
658                                     VSD_STD_ID_LEN)) {
659                         brelse(bh);
660                         break;
661                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
662                                     VSD_STD_ID_LEN))
663                         nsr02 = sector;
664                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
665                                     VSD_STD_ID_LEN))
666                         nsr03 = sector;
667                 brelse(bh);
668         }
669
670         if (nsr03)
671                 return nsr03;
672         else if (nsr02)
673                 return nsr02;
674         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
675                 return -1;
676         else
677                 return 0;
678 }
679
680 /*
681  * udf_find_anchor
682  *
683  * PURPOSE
684  *      Find an anchor volume descriptor.
685  *
686  * PRE-CONDITIONS
687  *      sb                      Pointer to _locked_ superblock.
688  *      lastblock               Last block on media.
689  *
690  * POST-CONDITIONS
691  *      <return>                1 if not found, 0 if ok
692  *
693  * HISTORY
694  *      July 1, 1997 - Andrew E. Mileski
695  *      Written, tested, and released.
696  */
697 static void udf_find_anchor(struct super_block *sb)
698 {
699         int lastblock;
700         struct buffer_head *bh = NULL;
701         uint16_t ident;
702         uint32_t location;
703         int i;
704         struct udf_sb_info *sbi;
705
706         sbi = UDF_SB(sb);
707         lastblock = sbi->s_last_block;
708
709         if (lastblock) {
710                 int varlastblock = udf_variable_to_fixed(lastblock);
711                 int last[] =  { lastblock, lastblock - 2,
712                                 lastblock - 150, lastblock - 152,
713                                 varlastblock, varlastblock - 2,
714                                 varlastblock - 150, varlastblock - 152 };
715
716                 lastblock = 0;
717
718                 /* Search for an anchor volume descriptor pointer */
719
720                 /*  according to spec, anchor is in either:
721                  *     block 256
722                  *     lastblock-256
723                  *     lastblock
724                  *  however, if the disc isn't closed, it could be 512 */
725
726                 for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
727                         ident = location = 0;
728                         if (last[i] >= 0) {
729                                 bh = sb_bread(sb, last[i]);
730                                 if (bh) {
731                                         tag *t = (tag *)bh->b_data;
732                                         ident = le16_to_cpu(t->tagIdent);
733                                         location = le32_to_cpu(t->tagLocation);
734                                         brelse(bh);
735                                 }
736                         }
737
738                         if (ident == TAG_IDENT_AVDP) {
739                                 if (location == last[i] - sbi->s_session) {
740                                         lastblock = last[i] - sbi->s_session;
741                                         sbi->s_anchor[0] = lastblock;
742                                         sbi->s_anchor[1] = lastblock - 256;
743                                 } else if (location ==
744                                                 udf_variable_to_fixed(last[i]) -
745                                                         sbi->s_session) {
746                                         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
747                                         lastblock =
748                                                 udf_variable_to_fixed(last[i]) -
749                                                         sbi->s_session;
750                                         sbi->s_anchor[0] = lastblock;
751                                         sbi->s_anchor[1] = lastblock - 256 -
752                                                                 sbi->s_session;
753                                 } else {
754                                         udf_debug("Anchor found at block %d, "
755                                                   "location mismatch %d.\n",
756                                                   last[i], location);
757                                 }
758                         } else if (ident == TAG_IDENT_FE ||
759                                         ident == TAG_IDENT_EFE) {
760                                 lastblock = last[i];
761                                 sbi->s_anchor[3] = 512;
762                         } else {
763                                 ident = location = 0;
764                                 if (last[i] >= 256) {
765                                         bh = sb_bread(sb, last[i] - 256);
766                                         if (bh) {
767                                                 tag *t = (tag *)bh->b_data;
768                                                 ident = le16_to_cpu(
769                                                                 t->tagIdent);
770                                                 location = le32_to_cpu(
771                                                                 t->tagLocation);
772                                                 brelse(bh);
773                                         }
774                                 }
775
776                                 if (ident == TAG_IDENT_AVDP &&
777                                     location == last[i] - 256 -
778                                                 sbi->s_session) {
779                                         lastblock = last[i];
780                                         sbi->s_anchor[1] = last[i] - 256;
781                                 } else {
782                                         ident = location = 0;
783                                         if (last[i] >= 312 + sbi->s_session) {
784                                                 bh = sb_bread(sb,
785                                                                 last[i] - 312 -
786                                                                 sbi->s_session);
787                                                 if (bh) {
788                                                         tag *t = (tag *)
789                                                                  bh->b_data;
790                                                         ident = le16_to_cpu(
791                                                                 t->tagIdent);
792                                                         location = le32_to_cpu(
793                                                                 t->tagLocation);
794                                                         brelse(bh);
795                                                 }
796                                         }
797
798                                         if (ident == TAG_IDENT_AVDP &&
799                                             location == udf_variable_to_fixed(last[i]) - 256) {
800                                                 UDF_SET_FLAG(sb,
801                                                              UDF_FLAG_VARCONV);
802                                                 lastblock = udf_variable_to_fixed(last[i]);
803                                                 sbi->s_anchor[1] = lastblock - 256;
804                                         }
805                                 }
806                         }
807                 }
808         }
809
810         if (!lastblock) {
811                 /* We haven't found the lastblock. check 312 */
812                 bh = sb_bread(sb, 312 + sbi->s_session);
813                 if (bh) {
814                         tag *t = (tag *)bh->b_data;
815                         ident = le16_to_cpu(t->tagIdent);
816                         location = le32_to_cpu(t->tagLocation);
817                         brelse(bh);
818
819                         if (ident == TAG_IDENT_AVDP && location == 256)
820                                 UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
821                 }
822         }
823
824         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
825                 if (!sbi->s_anchor[i])
826                         continue;
827                 bh = udf_read_tagged(sb, sbi->s_anchor[i],
828                                         sbi->s_anchor[i], &ident);
829                 if (!bh)
830                         sbi->s_anchor[i] = 0;
831                 else {
832                         brelse(bh);
833                         if ((ident != TAG_IDENT_AVDP) &&
834                                 (i || (ident != TAG_IDENT_FE &&
835                                         ident != TAG_IDENT_EFE)))
836                                 sbi->s_anchor[i] = 0;
837                 }
838         }
839
840         sbi->s_last_block = lastblock;
841 }
842
843 static int udf_find_fileset(struct super_block *sb,
844                             kernel_lb_addr *fileset,
845                             kernel_lb_addr *root)
846 {
847         struct buffer_head *bh = NULL;
848         long lastblock;
849         uint16_t ident;
850         struct udf_sb_info *sbi;
851
852         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
853             fileset->partitionReferenceNum != 0xFFFF) {
854                 bh = udf_read_ptagged(sb, *fileset, 0, &ident);
855
856                 if (!bh) {
857                         return 1;
858                 } else if (ident != TAG_IDENT_FSD) {
859                         brelse(bh);
860                         return 1;
861                 }
862
863         }
864
865         sbi = UDF_SB(sb);
866         if (!bh) {
867                 /* Search backwards through the partitions */
868                 kernel_lb_addr newfileset;
869
870 /* --> cvg: FIXME - is it reasonable? */
871                 return 1;
872
873                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
874                      (newfileset.partitionReferenceNum != 0xFFFF &&
875                       fileset->logicalBlockNum == 0xFFFFFFFF &&
876                       fileset->partitionReferenceNum == 0xFFFF);
877                      newfileset.partitionReferenceNum--) {
878                         lastblock = sbi->s_partmaps
879                                         [newfileset.partitionReferenceNum]
880                                                 .s_partition_len;
881                         newfileset.logicalBlockNum = 0;
882
883                         do {
884                                 bh = udf_read_ptagged(sb, newfileset, 0,
885                                                       &ident);
886                                 if (!bh) {
887                                         newfileset.logicalBlockNum++;
888                                         continue;
889                                 }
890
891                                 switch (ident) {
892                                 case TAG_IDENT_SBD:
893                                 {
894                                         struct spaceBitmapDesc *sp;
895                                         sp = (struct spaceBitmapDesc *)
896                                                                 bh->b_data;
897                                         newfileset.logicalBlockNum += 1 +
898                                                 ((le32_to_cpu(sp->numOfBytes) +
899                                                   sizeof(struct spaceBitmapDesc)
900                                                   - 1) >> sb->s_blocksize_bits);
901                                         brelse(bh);
902                                         break;
903                                 }
904                                 case TAG_IDENT_FSD:
905                                         *fileset = newfileset;
906                                         break;
907                                 default:
908                                         newfileset.logicalBlockNum++;
909                                         brelse(bh);
910                                         bh = NULL;
911                                         break;
912                                 }
913                         } while (newfileset.logicalBlockNum < lastblock &&
914                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
915                                  fileset->partitionReferenceNum == 0xFFFF);
916                 }
917         }
918
919         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
920              fileset->partitionReferenceNum != 0xFFFF) && bh) {
921                 udf_debug("Fileset at block=%d, partition=%d\n",
922                           fileset->logicalBlockNum,
923                           fileset->partitionReferenceNum);
924
925                 sbi->s_partition = fileset->partitionReferenceNum;
926                 udf_load_fileset(sb, bh, root);
927                 brelse(bh);
928                 return 0;
929         }
930         return 1;
931 }
932
933 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
934 {
935         struct primaryVolDesc *pvoldesc;
936         struct ustr instr;
937         struct ustr outstr;
938         struct buffer_head *bh;
939         uint16_t ident;
940
941         bh = udf_read_tagged(sb, block, block, &ident);
942         if (!bh)
943                 return 1;
944         BUG_ON(ident != TAG_IDENT_PVD);
945
946         pvoldesc = (struct primaryVolDesc *)bh->b_data;
947
948         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
949                               pvoldesc->recordingDateAndTime)) {
950 #ifdef UDFFS_DEBUG
951                 timestamp *ts = &pvoldesc->recordingDateAndTime;
952                 udf_debug("recording time %04u/%02u/%02u"
953                           " %02u:%02u (%x)\n",
954                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
955                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
956 #endif
957         }
958
959         if (!udf_build_ustr(&instr, pvoldesc->volIdent, 32))
960                 if (udf_CS0toUTF8(&outstr, &instr)) {
961                         strncpy(UDF_SB(sb)->s_volume_ident, outstr.u_name,
962                                 outstr.u_len > 31 ? 31 : outstr.u_len);
963                         udf_debug("volIdent[] = '%s'\n",
964                                         UDF_SB(sb)->s_volume_ident);
965                 }
966
967         if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
968                 if (udf_CS0toUTF8(&outstr, &instr))
969                         udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
970
971         brelse(bh);
972         return 0;
973 }
974
975 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
976                              kernel_lb_addr *root)
977 {
978         struct fileSetDesc *fset;
979
980         fset = (struct fileSetDesc *)bh->b_data;
981
982         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
983
984         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
985
986         udf_debug("Rootdir at block=%d, partition=%d\n",
987                   root->logicalBlockNum, root->partitionReferenceNum);
988 }
989
990 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
991 {
992         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
993         return DIV_ROUND_UP(map->s_partition_len +
994                             (sizeof(struct spaceBitmapDesc) << 3),
995                             sb->s_blocksize * 8);
996 }
997
998 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
999 {
1000         struct udf_bitmap *bitmap;
1001         int nr_groups;
1002         int size;
1003
1004         nr_groups = udf_compute_nr_groups(sb, index);
1005         size = sizeof(struct udf_bitmap) +
1006                 (sizeof(struct buffer_head *) * nr_groups);
1007
1008         if (size <= PAGE_SIZE)
1009                 bitmap = kmalloc(size, GFP_KERNEL);
1010         else
1011                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
1012
1013         if (bitmap == NULL) {
1014                 udf_error(sb, __FUNCTION__,
1015                           "Unable to allocate space for bitmap "
1016                           "and %d buffer_head pointers", nr_groups);
1017                 return NULL;
1018         }
1019
1020         memset(bitmap, 0x00, size);
1021         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
1022         bitmap->s_nr_groups = nr_groups;
1023         return bitmap;
1024 }
1025
1026 static int udf_fill_partdesc_info(struct super_block *sb,
1027                 struct partitionDesc *p, int p_index)
1028 {
1029         struct udf_part_map *map;
1030         struct udf_sb_info *sbi = UDF_SB(sb);
1031         struct partitionHeaderDesc *phd;
1032
1033         map = &sbi->s_partmaps[p_index];
1034
1035         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
1036         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1037
1038         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1039                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1040         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1041                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1042         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1043                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1044         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1045                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1046
1047         udf_debug("Partition (%d:%d type %x) starts at physical %d, "
1048                   "block length %d\n", partitionNumber, p_index,
1049                   map->s_partition_type, map->s_partition_root,
1050                   map->s_partition_len);
1051
1052         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1053             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1054                 return 0;
1055
1056         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1057         if (phd->unallocSpaceTable.extLength) {
1058                 kernel_lb_addr loc = {
1059                         .logicalBlockNum = le32_to_cpu(
1060                                 phd->unallocSpaceTable.extPosition),
1061                         .partitionReferenceNum = p_index,
1062                 };
1063
1064                 map->s_uspace.s_table = udf_iget(sb, loc);
1065                 if (!map->s_uspace.s_table) {
1066                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1067                                         p_index);
1068                         return 1;
1069                 }
1070                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1071                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1072                                 p_index, map->s_uspace.s_table->i_ino);
1073         }
1074
1075         if (phd->unallocSpaceBitmap.extLength) {
1076                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1077                 if (!bitmap)
1078                         return 1;
1079                 map->s_uspace.s_bitmap = bitmap;
1080                 bitmap->s_extLength = le32_to_cpu(
1081                                 phd->unallocSpaceBitmap.extLength);
1082                 bitmap->s_extPosition = le32_to_cpu(
1083                                 phd->unallocSpaceBitmap.extPosition);
1084                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1085                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1086                                                 bitmap->s_extPosition);
1087         }
1088
1089         if (phd->partitionIntegrityTable.extLength)
1090                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1091
1092         if (phd->freedSpaceTable.extLength) {
1093                 kernel_lb_addr loc = {
1094                         .logicalBlockNum = le32_to_cpu(
1095                                 phd->freedSpaceTable.extPosition),
1096                         .partitionReferenceNum = p_index,
1097                 };
1098
1099                 map->s_fspace.s_table = udf_iget(sb, loc);
1100                 if (!map->s_fspace.s_table) {
1101                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1102                                 p_index);
1103                         return 1;
1104                 }
1105
1106                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1107                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1108                                 p_index, map->s_fspace.s_table->i_ino);
1109         }
1110
1111         if (phd->freedSpaceBitmap.extLength) {
1112                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1113                 if (!bitmap)
1114                         return 1;
1115                 map->s_fspace.s_bitmap = bitmap;
1116                 bitmap->s_extLength = le32_to_cpu(
1117                                 phd->freedSpaceBitmap.extLength);
1118                 bitmap->s_extPosition = le32_to_cpu(
1119                                 phd->freedSpaceBitmap.extPosition);
1120                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1121                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1122                                         bitmap->s_extPosition);
1123         }
1124         return 0;
1125 }
1126
1127 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1128 {
1129         struct udf_sb_info *sbi = UDF_SB(sb);
1130         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1131         kernel_lb_addr ino;
1132         struct buffer_head *bh;
1133
1134         /* VAT file entry is in the last recorded block */
1135         ino.partitionReferenceNum = type1_index;
1136         ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root;
1137         sbi->s_vat_inode = udf_iget(sb, ino);
1138         if (!sbi->s_vat_inode)
1139                 return 1;
1140
1141         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1142                 map->s_type_specific.s_virtual.s_start_offset =
1143                         udf_ext0_offset(sbi->s_vat_inode);
1144                 map->s_type_specific.s_virtual.s_num_entries =
1145                         (sbi->s_vat_inode->i_size - 36) >> 2;
1146         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1147                 uint32_t pos;
1148                 struct virtualAllocationTable20 *vat20;
1149
1150                 pos = udf_block_map(sbi->s_vat_inode, 0);
1151                 bh = sb_bread(sb, pos);
1152                 if (!bh)
1153                         return 1;
1154                 vat20 = (struct virtualAllocationTable20 *)bh->b_data +
1155                                 udf_ext0_offset(sbi->s_vat_inode);
1156                 map->s_type_specific.s_virtual.s_start_offset =
1157                         le16_to_cpu(vat20->lengthHeader) +
1158                         udf_ext0_offset(sbi->s_vat_inode);
1159                 map->s_type_specific.s_virtual.s_num_entries =
1160                         (sbi->s_vat_inode->i_size -
1161                                 map->s_type_specific.s_virtual.
1162                                         s_start_offset) >> 2;
1163                 brelse(bh);
1164         }
1165         return 0;
1166 }
1167
1168 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1169 {
1170         struct buffer_head *bh;
1171         struct partitionDesc *p;
1172         struct udf_part_map *map;
1173         struct udf_sb_info *sbi = UDF_SB(sb);
1174         int i, type1_idx;
1175         uint16_t partitionNumber;
1176         uint16_t ident;
1177         int ret = 0;
1178
1179         bh = udf_read_tagged(sb, block, block, &ident);
1180         if (!bh)
1181                 return 1;
1182         if (ident != TAG_IDENT_PD)
1183                 goto out_bh;
1184
1185         p = (struct partitionDesc *)bh->b_data;
1186         partitionNumber = le16_to_cpu(p->partitionNumber);
1187
1188         /* First scan for TYPE1 and SPARABLE partitions */
1189         for (i = 0; i < sbi->s_partitions; i++) {
1190                 map = &sbi->s_partmaps[i];
1191                 udf_debug("Searching map: (%d == %d)\n",
1192                           map->s_partition_num, partitionNumber);
1193                 if (map->s_partition_num == partitionNumber &&
1194                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1195                      map->s_partition_type == UDF_SPARABLE_MAP15))
1196                         break;
1197         }
1198
1199         if (i >= sbi->s_partitions) {
1200                 udf_debug("Partition (%d) not found in partition map\n",
1201                           partitionNumber);
1202                 goto out_bh;
1203         }
1204
1205         ret = udf_fill_partdesc_info(sb, p, i);
1206
1207         /*
1208          * Now rescan for VIRTUAL partitions when TYPE1 partitions are
1209          * already set up
1210          */
1211         type1_idx = i;
1212         for (i = 0; i < sbi->s_partitions; i++) {
1213                 map = &sbi->s_partmaps[i];
1214
1215                 if (map->s_partition_num == partitionNumber &&
1216                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1217                      map->s_partition_type == UDF_VIRTUAL_MAP20))
1218                         break;
1219         }
1220
1221         if (i >= sbi->s_partitions)
1222                 goto out_bh;
1223
1224         ret = udf_fill_partdesc_info(sb, p, i);
1225         if (ret)
1226                 goto out_bh;
1227
1228         if (!sbi->s_last_block) {
1229                 sbi->s_last_block = udf_get_last_block(sb);
1230                 udf_find_anchor(sb);
1231                 if (!sbi->s_last_block) {
1232                         udf_debug("Unable to determine Lastblock (For "
1233                                         "Virtual Partition)\n");
1234                         ret = 1;
1235                         goto out_bh;
1236                 }
1237         }
1238
1239         ret = udf_load_vat(sb, i, type1_idx);
1240 out_bh:
1241         /* In case loading failed, we handle cleanup in udf_fill_super */
1242         brelse(bh);
1243         return ret;
1244 }
1245
1246 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1247                                kernel_lb_addr *fileset)
1248 {
1249         struct logicalVolDesc *lvd;
1250         int i, j, offset;
1251         uint8_t type;
1252         struct udf_sb_info *sbi = UDF_SB(sb);
1253         struct genericPartitionMap *gpm;
1254         uint16_t ident;
1255         struct buffer_head *bh;
1256         int ret = 0;
1257
1258         bh = udf_read_tagged(sb, block, block, &ident);
1259         if (!bh)
1260                 return 1;
1261         BUG_ON(ident != TAG_IDENT_LVD);
1262         lvd = (struct logicalVolDesc *)bh->b_data;
1263
1264         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1265         if (i != 0) {
1266                 ret = i;
1267                 goto out_bh;
1268         }
1269
1270         for (i = 0, offset = 0;
1271              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1272              i++, offset += gpm->partitionMapLength) {
1273                 struct udf_part_map *map = &sbi->s_partmaps[i];
1274                 gpm = (struct genericPartitionMap *)
1275                                 &(lvd->partitionMaps[offset]);
1276                 type = gpm->partitionMapType;
1277                 if (type == 1) {
1278                         struct genericPartitionMap1 *gpm1 =
1279                                 (struct genericPartitionMap1 *)gpm;
1280                         map->s_partition_type = UDF_TYPE1_MAP15;
1281                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1282                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1283                         map->s_partition_func = NULL;
1284                 } else if (type == 2) {
1285                         struct udfPartitionMap2 *upm2 =
1286                                                 (struct udfPartitionMap2 *)gpm;
1287                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1288                                                 strlen(UDF_ID_VIRTUAL))) {
1289                                 u16 suf =
1290                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1291                                                         identSuffix)[0]);
1292                                 if (suf == 0x0150) {
1293                                         map->s_partition_type =
1294                                                         UDF_VIRTUAL_MAP15;
1295                                         map->s_partition_func =
1296                                                         udf_get_pblock_virt15;
1297                                 } else if (suf == 0x0200) {
1298                                         map->s_partition_type =
1299                                                         UDF_VIRTUAL_MAP20;
1300                                         map->s_partition_func =
1301                                                         udf_get_pblock_virt20;
1302                                 }
1303                         } else if (!strncmp(upm2->partIdent.ident,
1304                                                 UDF_ID_SPARABLE,
1305                                                 strlen(UDF_ID_SPARABLE))) {
1306                                 uint32_t loc;
1307                                 struct sparingTable *st;
1308                                 struct sparablePartitionMap *spm =
1309                                         (struct sparablePartitionMap *)gpm;
1310
1311                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1312                                 map->s_type_specific.s_sparing.s_packet_len =
1313                                                 le16_to_cpu(spm->packetLength);
1314                                 for (j = 0; j < spm->numSparingTables; j++) {
1315                                         struct buffer_head *bh2;
1316
1317                                         loc = le32_to_cpu(
1318                                                 spm->locSparingTable[j]);
1319                                         bh2 = udf_read_tagged(sb, loc, loc,
1320                                                              &ident);
1321                                         map->s_type_specific.s_sparing.
1322                                                         s_spar_map[j] = bh2;
1323
1324                                         if (bh2 == NULL)
1325                                                 continue;
1326
1327                                         st = (struct sparingTable *)bh2->b_data;
1328                                         if (ident != 0 || strncmp(
1329                                                 st->sparingIdent.ident,
1330                                                 UDF_ID_SPARING,
1331                                                 strlen(UDF_ID_SPARING))) {
1332                                                 brelse(bh2);
1333                                                 map->s_type_specific.s_sparing.
1334                                                         s_spar_map[j] = NULL;
1335                                         }
1336                                 }
1337                                 map->s_partition_func = udf_get_pblock_spar15;
1338                         } else {
1339                                 udf_debug("Unknown ident: %s\n",
1340                                           upm2->partIdent.ident);
1341                                 continue;
1342                         }
1343                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1344                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1345                 }
1346                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1347                           i, map->s_partition_num, type,
1348                           map->s_volumeseqnum);
1349         }
1350
1351         if (fileset) {
1352                 long_ad *la = (long_ad *)&(lvd->logicalVolContentsUse[0]);
1353
1354                 *fileset = lelb_to_cpu(la->extLocation);
1355                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1356                           "partition=%d\n", fileset->logicalBlockNum,
1357                           fileset->partitionReferenceNum);
1358         }
1359         if (lvd->integritySeqExt.extLength)
1360                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1361
1362 out_bh:
1363         brelse(bh);
1364         return ret;
1365 }
1366
1367 /*
1368  * udf_load_logicalvolint
1369  *
1370  */
1371 static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
1372 {
1373         struct buffer_head *bh = NULL;
1374         uint16_t ident;
1375         struct udf_sb_info *sbi = UDF_SB(sb);
1376         struct logicalVolIntegrityDesc *lvid;
1377
1378         while (loc.extLength > 0 &&
1379                (bh = udf_read_tagged(sb, loc.extLocation,
1380                                      loc.extLocation, &ident)) &&
1381                ident == TAG_IDENT_LVID) {
1382                 sbi->s_lvid_bh = bh;
1383                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1384
1385                 if (lvid->nextIntegrityExt.extLength)
1386                         udf_load_logicalvolint(sb,
1387                                 leea_to_cpu(lvid->nextIntegrityExt));
1388
1389                 if (sbi->s_lvid_bh != bh)
1390                         brelse(bh);
1391                 loc.extLength -= sb->s_blocksize;
1392                 loc.extLocation++;
1393         }
1394         if (sbi->s_lvid_bh != bh)
1395                 brelse(bh);
1396 }
1397
1398 /*
1399  * udf_process_sequence
1400  *
1401  * PURPOSE
1402  *      Process a main/reserve volume descriptor sequence.
1403  *
1404  * PRE-CONDITIONS
1405  *      sb                      Pointer to _locked_ superblock.
1406  *      block                   First block of first extent of the sequence.
1407  *      lastblock               Lastblock of first extent of the sequence.
1408  *
1409  * HISTORY
1410  *      July 1, 1997 - Andrew E. Mileski
1411  *      Written, tested, and released.
1412  */
1413 static noinline int udf_process_sequence(struct super_block *sb, long block,
1414                                 long lastblock, kernel_lb_addr *fileset)
1415 {
1416         struct buffer_head *bh = NULL;
1417         struct udf_vds_record vds[VDS_POS_LENGTH];
1418         struct udf_vds_record *curr;
1419         struct generic_desc *gd;
1420         struct volDescPtr *vdp;
1421         int done = 0;
1422         uint32_t vdsn;
1423         uint16_t ident;
1424         long next_s = 0, next_e = 0;
1425
1426         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1427
1428         /*
1429          * Read the main descriptor sequence and find which descriptors
1430          * are in it.
1431          */
1432         for (; (!done && block <= lastblock); block++) {
1433
1434                 bh = udf_read_tagged(sb, block, block, &ident);
1435                 if (!bh) {
1436                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1437                                "sequence is corrupted or we could not read "
1438                                "it.\n", (unsigned long long)block);
1439                         return 1;
1440                 }
1441
1442                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1443                 gd = (struct generic_desc *)bh->b_data;
1444                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1445                 switch (ident) {
1446                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1447                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1448                         if (vdsn >= curr->volDescSeqNum) {
1449                                 curr->volDescSeqNum = vdsn;
1450                                 curr->block = block;
1451                         }
1452                         break;
1453                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1454                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1455                         if (vdsn >= curr->volDescSeqNum) {
1456                                 curr->volDescSeqNum = vdsn;
1457                                 curr->block = block;
1458
1459                                 vdp = (struct volDescPtr *)bh->b_data;
1460                                 next_s = le32_to_cpu(
1461                                         vdp->nextVolDescSeqExt.extLocation);
1462                                 next_e = le32_to_cpu(
1463                                         vdp->nextVolDescSeqExt.extLength);
1464                                 next_e = next_e >> sb->s_blocksize_bits;
1465                                 next_e += next_s;
1466                         }
1467                         break;
1468                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1469                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1470                         if (vdsn >= curr->volDescSeqNum) {
1471                                 curr->volDescSeqNum = vdsn;
1472                                 curr->block = block;
1473                         }
1474                         break;
1475                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1476                         curr = &vds[VDS_POS_PARTITION_DESC];
1477                         if (!curr->block)
1478                                 curr->block = block;
1479                         break;
1480                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1481                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1482                         if (vdsn >= curr->volDescSeqNum) {
1483                                 curr->volDescSeqNum = vdsn;
1484                                 curr->block = block;
1485                         }
1486                         break;
1487                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1488                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1489                         if (vdsn >= curr->volDescSeqNum) {
1490                                 curr->volDescSeqNum = vdsn;
1491                                 curr->block = block;
1492                         }
1493                         break;
1494                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1495                         vds[VDS_POS_TERMINATING_DESC].block = block;
1496                         if (next_e) {
1497                                 block = next_s;
1498                                 lastblock = next_e;
1499                                 next_s = next_e = 0;
1500                         } else
1501                                 done = 1;
1502                         break;
1503                 }
1504                 brelse(bh);
1505         }
1506         /*
1507          * Now read interesting descriptors again and process them
1508          * in a suitable order
1509          */
1510         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1511                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1512                 return 1;
1513         }
1514         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1515                 return 1;
1516
1517         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1518             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1519                 return 1;
1520
1521         if (vds[VDS_POS_PARTITION_DESC].block) {
1522                 /*
1523                  * We rescan the whole descriptor sequence to find
1524                  * partition descriptor blocks and process them.
1525                  */
1526                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1527                      block < vds[VDS_POS_TERMINATING_DESC].block;
1528                      block++)
1529                         if (udf_load_partdesc(sb, block))
1530                                 return 1;
1531         }
1532
1533         return 0;
1534 }
1535
1536 /*
1537  * udf_check_valid()
1538  */
1539 static int udf_check_valid(struct super_block *sb, int novrs, int silent)
1540 {
1541         long block;
1542         struct udf_sb_info *sbi = UDF_SB(sb);
1543
1544         if (novrs) {
1545                 udf_debug("Validity check skipped because of novrs option\n");
1546                 return 0;
1547         }
1548         /* Check that it is NSR02 compliant */
1549         /* Process any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
1550         block = udf_vrs(sb, silent);
1551         if (block == -1)
1552                 udf_debug("Failed to read byte 32768. Assuming open "
1553                           "disc. Skipping validity check\n");
1554         if (block && !sbi->s_last_block)
1555                 sbi->s_last_block = udf_get_last_block(sb);
1556         return !block;
1557 }
1558
1559 static int udf_load_sequence(struct super_block *sb, kernel_lb_addr *fileset)
1560 {
1561         struct anchorVolDescPtr *anchor;
1562         uint16_t ident;
1563         struct buffer_head *bh;
1564         long main_s, main_e, reserve_s, reserve_e;
1565         int i;
1566         struct udf_sb_info *sbi;
1567
1568         if (!sb)
1569                 return 1;
1570         sbi = UDF_SB(sb);
1571
1572         for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
1573                 if (!sbi->s_anchor[i])
1574                         continue;
1575
1576                 bh = udf_read_tagged(sb, sbi->s_anchor[i], sbi->s_anchor[i],
1577                                      &ident);
1578                 if (!bh)
1579                         continue;
1580
1581                 anchor = (struct anchorVolDescPtr *)bh->b_data;
1582
1583                 /* Locate the main sequence */
1584                 main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1585                 main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1586                 main_e = main_e >> sb->s_blocksize_bits;
1587                 main_e += main_s;
1588
1589                 /* Locate the reserve sequence */
1590                 reserve_s = le32_to_cpu(
1591                                 anchor->reserveVolDescSeqExt.extLocation);
1592                 reserve_e = le32_to_cpu(
1593                                 anchor->reserveVolDescSeqExt.extLength);
1594                 reserve_e = reserve_e >> sb->s_blocksize_bits;
1595                 reserve_e += reserve_s;
1596
1597                 brelse(bh);
1598
1599                 /* Process the main & reserve sequences */
1600                 /* responsible for finding the PartitionDesc(s) */
1601                 if (!(udf_process_sequence(sb, main_s, main_e,
1602                                            fileset) &&
1603                       udf_process_sequence(sb, reserve_s, reserve_e,
1604                                            fileset)))
1605                         break;
1606         }
1607
1608         if (i == ARRAY_SIZE(sbi->s_anchor)) {
1609                 udf_debug("No Anchor block found\n");
1610                 return 1;
1611         }
1612         udf_debug("Using anchor in block %d\n", sbi->s_anchor[i]);
1613
1614         return 0;
1615 }
1616
1617 static void udf_open_lvid(struct super_block *sb)
1618 {
1619         struct udf_sb_info *sbi = UDF_SB(sb);
1620         struct buffer_head *bh = sbi->s_lvid_bh;
1621         struct logicalVolIntegrityDesc *lvid;
1622         struct logicalVolIntegrityDescImpUse *lvidiu;
1623         if (!bh)
1624                 return;
1625
1626         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1627         lvidiu = udf_sb_lvidiu(sbi);
1628
1629         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1630         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1631         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1632                                 CURRENT_TIME);
1633         lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
1634
1635         lvid->descTag.descCRC = cpu_to_le16(
1636                 udf_crc((char *)lvid + sizeof(tag),
1637                         le16_to_cpu(lvid->descTag.descCRCLength), 0));
1638
1639         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1640         mark_buffer_dirty(bh);
1641 }
1642
1643 static void udf_close_lvid(struct super_block *sb)
1644 {
1645         struct udf_sb_info *sbi = UDF_SB(sb);
1646         struct buffer_head *bh = sbi->s_lvid_bh;
1647         struct logicalVolIntegrityDesc *lvid;
1648         struct logicalVolIntegrityDescImpUse *lvidiu;
1649
1650         if (!bh)
1651                 return;
1652
1653         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1654
1655         if (lvid->integrityType != LVID_INTEGRITY_TYPE_OPEN)
1656                 return;
1657
1658         lvidiu = udf_sb_lvidiu(sbi);
1659         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1660         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1661         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1662         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1663                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1664         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1665                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1666         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1667                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1668         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1669
1670         lvid->descTag.descCRC = cpu_to_le16(
1671                 udf_crc((char *)lvid + sizeof(tag),
1672                         le16_to_cpu(lvid->descTag.descCRCLength),
1673                         0));
1674
1675         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1676         mark_buffer_dirty(bh);
1677 }
1678
1679 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1680 {
1681         int i;
1682         int nr_groups = bitmap->s_nr_groups;
1683         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1684                                                 nr_groups);
1685
1686         for (i = 0; i < nr_groups; i++)
1687                 if (bitmap->s_block_bitmap[i])
1688                         brelse(bitmap->s_block_bitmap[i]);
1689
1690         if (size <= PAGE_SIZE)
1691                 kfree(bitmap);
1692         else
1693                 vfree(bitmap);
1694 }
1695
1696 static void udf_free_partition(struct udf_part_map *map)
1697 {
1698         int i;
1699
1700         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1701                 iput(map->s_uspace.s_table);
1702         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1703                 iput(map->s_fspace.s_table);
1704         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1705                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1706         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1707                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1708         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1709                 for (i = 0; i < 4; i++)
1710                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1711 }
1712
1713 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1714 {
1715         int i;
1716         struct inode *inode = NULL;
1717         struct udf_options uopt;
1718         kernel_lb_addr rootdir, fileset;
1719         struct udf_sb_info *sbi;
1720
1721         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1722         uopt.uid = -1;
1723         uopt.gid = -1;
1724         uopt.umask = 0;
1725
1726         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1727         if (!sbi)
1728                 return -ENOMEM;
1729
1730         sb->s_fs_info = sbi;
1731
1732         mutex_init(&sbi->s_alloc_mutex);
1733
1734         if (!udf_parse_options((char *)options, &uopt, false))
1735                 goto error_out;
1736
1737         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1738             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1739                 udf_error(sb, "udf_read_super",
1740                           "utf8 cannot be combined with iocharset\n");
1741                 goto error_out;
1742         }
1743 #ifdef CONFIG_UDF_NLS
1744         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1745                 uopt.nls_map = load_nls_default();
1746                 if (!uopt.nls_map)
1747                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1748                 else
1749                         udf_debug("Using default NLS map\n");
1750         }
1751 #endif
1752         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1753                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1754
1755         fileset.logicalBlockNum = 0xFFFFFFFF;
1756         fileset.partitionReferenceNum = 0xFFFF;
1757
1758         sbi->s_flags = uopt.flags;
1759         sbi->s_uid = uopt.uid;
1760         sbi->s_gid = uopt.gid;
1761         sbi->s_umask = uopt.umask;
1762         sbi->s_nls_map = uopt.nls_map;
1763
1764         /* Set the block size for all transfers */
1765         if (!sb_min_blocksize(sb, uopt.blocksize)) {
1766                 udf_debug("Bad block size (%d)\n", uopt.blocksize);
1767                 printk(KERN_ERR "udf: bad block size (%d)\n", uopt.blocksize);
1768                 goto error_out;
1769         }
1770
1771         if (uopt.session == 0xFFFFFFFF)
1772                 sbi->s_session = udf_get_last_session(sb);
1773         else
1774                 sbi->s_session = uopt.session;
1775
1776         udf_debug("Multi-session=%d\n", sbi->s_session);
1777
1778         sbi->s_last_block = uopt.lastblock;
1779         sbi->s_anchor[0] = sbi->s_anchor[1] = 0;
1780         sbi->s_anchor[2] = uopt.anchor;
1781         sbi->s_anchor[3] = 256;
1782
1783         if (udf_check_valid(sb, uopt.novrs, silent)) {
1784                 /* read volume recognition sequences */
1785                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1786                 goto error_out;
1787         }
1788
1789         udf_find_anchor(sb);
1790
1791         /* Fill in the rest of the superblock */
1792         sb->s_op = &udf_sb_ops;
1793         sb->dq_op = NULL;
1794         sb->s_dirt = 0;
1795         sb->s_magic = UDF_SUPER_MAGIC;
1796         sb->s_time_gran = 1000;
1797
1798         if (udf_load_sequence(sb, &fileset)) {
1799                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1800                 goto error_out;
1801         }
1802
1803         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1804
1805         if (sbi->s_lvid_bh) {
1806                 struct logicalVolIntegrityDescImpUse *lvidiu =
1807                                                         udf_sb_lvidiu(sbi);
1808                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1809                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1810                 /* uint16_t maxUDFWriteRev =
1811                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1812
1813                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1814                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1815                                         "(max is %x)\n",
1816                                le16_to_cpu(lvidiu->minUDFReadRev),
1817                                UDF_MAX_READ_VERSION);
1818                         goto error_out;
1819                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
1820                         sb->s_flags |= MS_RDONLY;
1821
1822                 sbi->s_udfrev = minUDFWriteRev;
1823
1824                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
1825                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
1826                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
1827                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
1828         }
1829
1830         if (!sbi->s_partitions) {
1831                 printk(KERN_WARNING "UDF-fs: No partition found (2)\n");
1832                 goto error_out;
1833         }
1834
1835         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
1836                         UDF_PART_FLAG_READ_ONLY) {
1837                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
1838                                    "forcing readonly mount\n");
1839                 sb->s_flags |= MS_RDONLY;
1840         }
1841
1842         if (udf_find_fileset(sb, &fileset, &rootdir)) {
1843                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
1844                 goto error_out;
1845         }
1846
1847         if (!silent) {
1848                 timestamp ts;
1849                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
1850                 udf_info("UDF: Mounting volume '%s', "
1851                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
1852                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
1853                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
1854         }
1855         if (!(sb->s_flags & MS_RDONLY))
1856                 udf_open_lvid(sb);
1857
1858         /* Assign the root inode */
1859         /* assign inodes by physical block number */
1860         /* perhaps it's not extensible enough, but for now ... */
1861         inode = udf_iget(sb, rootdir);
1862         if (!inode) {
1863                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
1864                                 "partition=%d\n",
1865                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
1866                 goto error_out;
1867         }
1868
1869         /* Allocate a dentry for the root inode */
1870         sb->s_root = d_alloc_root(inode);
1871         if (!sb->s_root) {
1872                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
1873                 iput(inode);
1874                 goto error_out;
1875         }
1876         sb->s_maxbytes = MAX_LFS_FILESIZE;
1877         return 0;
1878
1879 error_out:
1880         if (sbi->s_vat_inode)
1881                 iput(sbi->s_vat_inode);
1882         if (sbi->s_partitions)
1883                 for (i = 0; i < sbi->s_partitions; i++)
1884                         udf_free_partition(&sbi->s_partmaps[i]);
1885 #ifdef CONFIG_UDF_NLS
1886         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1887                 unload_nls(sbi->s_nls_map);
1888 #endif
1889         if (!(sb->s_flags & MS_RDONLY))
1890                 udf_close_lvid(sb);
1891         brelse(sbi->s_lvid_bh);
1892
1893         kfree(sbi->s_partmaps);
1894         kfree(sbi);
1895         sb->s_fs_info = NULL;
1896
1897         return -EINVAL;
1898 }
1899
1900 static void udf_error(struct super_block *sb, const char *function,
1901                       const char *fmt, ...)
1902 {
1903         va_list args;
1904
1905         if (!(sb->s_flags & MS_RDONLY)) {
1906                 /* mark sb error */
1907                 sb->s_dirt = 1;
1908         }
1909         va_start(args, fmt);
1910         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1911         va_end(args);
1912         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
1913                 sb->s_id, function, error_buf);
1914 }
1915
1916 void udf_warning(struct super_block *sb, const char *function,
1917                  const char *fmt, ...)
1918 {
1919         va_list args;
1920
1921         va_start(args, fmt);
1922         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1923         va_end(args);
1924         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
1925                sb->s_id, function, error_buf);
1926 }
1927
1928 static void udf_put_super(struct super_block *sb)
1929 {
1930         int i;
1931         struct udf_sb_info *sbi;
1932
1933         sbi = UDF_SB(sb);
1934         if (sbi->s_vat_inode)
1935                 iput(sbi->s_vat_inode);
1936         if (sbi->s_partitions)
1937                 for (i = 0; i < sbi->s_partitions; i++)
1938                         udf_free_partition(&sbi->s_partmaps[i]);
1939 #ifdef CONFIG_UDF_NLS
1940         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
1941                 unload_nls(sbi->s_nls_map);
1942 #endif
1943         if (!(sb->s_flags & MS_RDONLY))
1944                 udf_close_lvid(sb);
1945         brelse(sbi->s_lvid_bh);
1946         kfree(sbi->s_partmaps);
1947         kfree(sb->s_fs_info);
1948         sb->s_fs_info = NULL;
1949 }
1950
1951 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
1952 {
1953         struct super_block *sb = dentry->d_sb;
1954         struct udf_sb_info *sbi = UDF_SB(sb);
1955         struct logicalVolIntegrityDescImpUse *lvidiu;
1956
1957         if (sbi->s_lvid_bh != NULL)
1958                 lvidiu = udf_sb_lvidiu(sbi);
1959         else
1960                 lvidiu = NULL;
1961
1962         buf->f_type = UDF_SUPER_MAGIC;
1963         buf->f_bsize = sb->s_blocksize;
1964         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
1965         buf->f_bfree = udf_count_free(sb);
1966         buf->f_bavail = buf->f_bfree;
1967         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
1968                                           le32_to_cpu(lvidiu->numDirs)) : 0)
1969                         + buf->f_bfree;
1970         buf->f_ffree = buf->f_bfree;
1971         /* __kernel_fsid_t f_fsid */
1972         buf->f_namelen = UDF_NAME_LEN - 2;
1973
1974         return 0;
1975 }
1976
1977 static unsigned int udf_count_free_bitmap(struct super_block *sb,
1978                                           struct udf_bitmap *bitmap)
1979 {
1980         struct buffer_head *bh = NULL;
1981         unsigned int accum = 0;
1982         int index;
1983         int block = 0, newblock;
1984         kernel_lb_addr loc;
1985         uint32_t bytes;
1986         uint8_t *ptr;
1987         uint16_t ident;
1988         struct spaceBitmapDesc *bm;
1989
1990         lock_kernel();
1991
1992         loc.logicalBlockNum = bitmap->s_extPosition;
1993         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
1994         bh = udf_read_ptagged(sb, loc, 0, &ident);
1995
1996         if (!bh) {
1997                 printk(KERN_ERR "udf: udf_count_free failed\n");
1998                 goto out;
1999         } else if (ident != TAG_IDENT_SBD) {
2000                 brelse(bh);
2001                 printk(KERN_ERR "udf: udf_count_free failed\n");
2002                 goto out;
2003         }
2004
2005         bm = (struct spaceBitmapDesc *)bh->b_data;
2006         bytes = le32_to_cpu(bm->numOfBytes);
2007         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2008         ptr = (uint8_t *)bh->b_data;
2009
2010         while (bytes > 0) {
2011                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2012                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2013                                         cur_bytes * 8);
2014                 bytes -= cur_bytes;
2015                 if (bytes) {
2016                         brelse(bh);
2017                         newblock = udf_get_lb_pblock(sb, loc, ++block);
2018                         bh = udf_tread(sb, newblock);
2019                         if (!bh) {
2020                                 udf_debug("read failed\n");
2021                                 goto out;
2022                         }
2023                         index = 0;
2024                         ptr = (uint8_t *)bh->b_data;
2025                 }
2026         }
2027         brelse(bh);
2028
2029 out:
2030         unlock_kernel();
2031
2032         return accum;
2033 }
2034
2035 static unsigned int udf_count_free_table(struct super_block *sb,
2036                                          struct inode *table)
2037 {
2038         unsigned int accum = 0;
2039         uint32_t elen;
2040         kernel_lb_addr eloc;
2041         int8_t etype;
2042         struct extent_position epos;
2043
2044         lock_kernel();
2045
2046         epos.block = UDF_I(table)->i_location;
2047         epos.offset = sizeof(struct unallocSpaceEntry);
2048         epos.bh = NULL;
2049
2050         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2051                 accum += (elen >> table->i_sb->s_blocksize_bits);
2052
2053         brelse(epos.bh);
2054
2055         unlock_kernel();
2056
2057         return accum;
2058 }
2059
2060 static unsigned int udf_count_free(struct super_block *sb)
2061 {
2062         unsigned int accum = 0;
2063         struct udf_sb_info *sbi;
2064         struct udf_part_map *map;
2065
2066         sbi = UDF_SB(sb);
2067         if (sbi->s_lvid_bh) {
2068                 struct logicalVolIntegrityDesc *lvid =
2069                         (struct logicalVolIntegrityDesc *)
2070                         sbi->s_lvid_bh->b_data;
2071                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2072                         accum = le32_to_cpu(
2073                                         lvid->freeSpaceTable[sbi->s_partition]);
2074                         if (accum == 0xFFFFFFFF)
2075                                 accum = 0;
2076                 }
2077         }
2078
2079         if (accum)
2080                 return accum;
2081
2082         map = &sbi->s_partmaps[sbi->s_partition];
2083         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2084                 accum += udf_count_free_bitmap(sb,
2085                                                map->s_uspace.s_bitmap);
2086         }
2087         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2088                 accum += udf_count_free_bitmap(sb,
2089                                                map->s_fspace.s_bitmap);
2090         }
2091         if (accum)
2092                 return accum;
2093
2094         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2095                 accum += udf_count_free_table(sb,
2096                                               map->s_uspace.s_table);
2097         }
2098         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2099                 accum += udf_count_free_table(sb,
2100                                               map->s_fspace.s_table);
2101         }
2102
2103         return accum;
2104 }