quota: move unmount handling into the filesystem
[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/quotaops.h>
58 #include <linux/seq_file.h>
59 #include <linux/bitmap.h>
60 #include <linux/crc-itu-t.h>
61 #include <asm/byteorder.h>
62
63 #include "udf_sb.h"
64 #include "udf_i.h"
65
66 #include <linux/init.h>
67 #include <asm/uaccess.h>
68
69 #define VDS_POS_PRIMARY_VOL_DESC        0
70 #define VDS_POS_UNALLOC_SPACE_DESC      1
71 #define VDS_POS_LOGICAL_VOL_DESC        2
72 #define VDS_POS_PARTITION_DESC          3
73 #define VDS_POS_IMP_USE_VOL_DESC        4
74 #define VDS_POS_VOL_DESC_PTR            5
75 #define VDS_POS_TERMINATING_DESC        6
76 #define VDS_POS_LENGTH                  7
77
78 #define UDF_DEFAULT_BLOCKSIZE 2048
79
80 static char error_buf[1024];
81
82 /* These are the "meat" - everything else is stuffing */
83 static int udf_fill_super(struct super_block *, void *, int);
84 static void udf_put_super(struct super_block *);
85 static int udf_sync_fs(struct super_block *, int);
86 static int udf_remount_fs(struct super_block *, int *, char *);
87 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
88 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
89                             struct kernel_lb_addr *);
90 static void udf_load_fileset(struct super_block *, struct buffer_head *,
91                              struct kernel_lb_addr *);
92 static void udf_open_lvid(struct super_block *);
93 static void udf_close_lvid(struct super_block *);
94 static unsigned int udf_count_free(struct super_block *);
95 static int udf_statfs(struct dentry *, struct kstatfs *);
96 static int udf_show_options(struct seq_file *, struct vfsmount *);
97 static void udf_error(struct super_block *sb, const char *function,
98                       const char *fmt, ...);
99
100 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
101 {
102         struct logicalVolIntegrityDesc *lvid =
103                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
104         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
105         __u32 offset = number_of_partitions * 2 *
106                                 sizeof(uint32_t)/sizeof(uint8_t);
107         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
108 }
109
110 /* UDF filesystem type */
111 static int udf_get_sb(struct file_system_type *fs_type,
112                       int flags, const char *dev_name, void *data,
113                       struct vfsmount *mnt)
114 {
115         return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
116 }
117
118 static struct file_system_type udf_fstype = {
119         .owner          = THIS_MODULE,
120         .name           = "udf",
121         .get_sb         = udf_get_sb,
122         .kill_sb        = kill_block_super,
123         .fs_flags       = FS_REQUIRES_DEV,
124 };
125
126 static struct kmem_cache *udf_inode_cachep;
127
128 static struct inode *udf_alloc_inode(struct super_block *sb)
129 {
130         struct udf_inode_info *ei;
131         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
132         if (!ei)
133                 return NULL;
134
135         ei->i_unique = 0;
136         ei->i_lenExtents = 0;
137         ei->i_next_alloc_block = 0;
138         ei->i_next_alloc_goal = 0;
139         ei->i_strat4096 = 0;
140
141         return &ei->vfs_inode;
142 }
143
144 static void udf_destroy_inode(struct inode *inode)
145 {
146         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
147 }
148
149 static void init_once(void *foo)
150 {
151         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
152
153         ei->i_ext.i_data = NULL;
154         inode_init_once(&ei->vfs_inode);
155 }
156
157 static int init_inodecache(void)
158 {
159         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
160                                              sizeof(struct udf_inode_info),
161                                              0, (SLAB_RECLAIM_ACCOUNT |
162                                                  SLAB_MEM_SPREAD),
163                                              init_once);
164         if (!udf_inode_cachep)
165                 return -ENOMEM;
166         return 0;
167 }
168
169 static void destroy_inodecache(void)
170 {
171         kmem_cache_destroy(udf_inode_cachep);
172 }
173
174 /* Superblock operations */
175 static const struct super_operations udf_sb_ops = {
176         .alloc_inode    = udf_alloc_inode,
177         .destroy_inode  = udf_destroy_inode,
178         .write_inode    = udf_write_inode,
179         .delete_inode   = udf_delete_inode,
180         .clear_inode    = udf_clear_inode,
181         .put_super      = udf_put_super,
182         .sync_fs        = udf_sync_fs,
183         .statfs         = udf_statfs,
184         .remount_fs     = udf_remount_fs,
185         .show_options   = udf_show_options,
186 };
187
188 struct udf_options {
189         unsigned char novrs;
190         unsigned int blocksize;
191         unsigned int session;
192         unsigned int lastblock;
193         unsigned int anchor;
194         unsigned int volume;
195         unsigned short partition;
196         unsigned int fileset;
197         unsigned int rootdir;
198         unsigned int flags;
199         mode_t umask;
200         gid_t gid;
201         uid_t uid;
202         mode_t fmode;
203         mode_t dmode;
204         struct nls_table *nls_map;
205 };
206
207 static int __init init_udf_fs(void)
208 {
209         int err;
210
211         err = init_inodecache();
212         if (err)
213                 goto out1;
214         err = register_filesystem(&udf_fstype);
215         if (err)
216                 goto out;
217
218         return 0;
219
220 out:
221         destroy_inodecache();
222
223 out1:
224         return err;
225 }
226
227 static void __exit exit_udf_fs(void)
228 {
229         unregister_filesystem(&udf_fstype);
230         destroy_inodecache();
231 }
232
233 module_init(init_udf_fs)
234 module_exit(exit_udf_fs)
235
236 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
237 {
238         struct udf_sb_info *sbi = UDF_SB(sb);
239
240         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
241                                   GFP_KERNEL);
242         if (!sbi->s_partmaps) {
243                 udf_error(sb, __func__,
244                           "Unable to allocate space for %d partition maps",
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 vfsmount *mnt)
255 {
256         struct super_block *sb = mnt->mnt_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=%o", sbi->s_umask);
285         if (sbi->s_fmode != UDF_INVALID_MODE)
286                 seq_printf(seq, ",mode=%o", sbi->s_fmode);
287         if (sbi->s_dmode != UDF_INVALID_MODE)
288                 seq_printf(seq, ",dmode=%o", 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                         printk(KERN_ERR "udf: bad mount option \"%s\" "
550                                "or missing value\n", p);
551                         return 0;
552                 }
553         }
554         return 1;
555 }
556
557 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
558 {
559         struct udf_options uopt;
560         struct udf_sb_info *sbi = UDF_SB(sb);
561         int error = 0;
562
563         uopt.flags = sbi->s_flags;
564         uopt.uid   = sbi->s_uid;
565         uopt.gid   = sbi->s_gid;
566         uopt.umask = sbi->s_umask;
567         uopt.fmode = sbi->s_fmode;
568         uopt.dmode = sbi->s_dmode;
569
570         if (!udf_parse_options(options, &uopt, true))
571                 return -EINVAL;
572
573         lock_kernel();
574         sbi->s_flags = uopt.flags;
575         sbi->s_uid   = uopt.uid;
576         sbi->s_gid   = uopt.gid;
577         sbi->s_umask = uopt.umask;
578         sbi->s_fmode = uopt.fmode;
579         sbi->s_dmode = uopt.dmode;
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
593                 error = dquot_suspend(sb, -1);
594         } else {
595                 udf_open_lvid(sb);
596
597                 /* mark the fs r/w for quota activity */
598                 sb->s_flags &= ~MS_RDONLY;
599                 dquot_resume(sb, -1);
600         }
601
602 out_unlock:
603         unlock_kernel();
604         return error;
605 }
606
607 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
608 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
609 static loff_t udf_check_vsd(struct super_block *sb)
610 {
611         struct volStructDesc *vsd = NULL;
612         loff_t sector = 32768;
613         int sectorsize;
614         struct buffer_head *bh = NULL;
615         int nsr02 = 0;
616         int nsr03 = 0;
617         struct udf_sb_info *sbi;
618
619         sbi = UDF_SB(sb);
620         if (sb->s_blocksize < sizeof(struct volStructDesc))
621                 sectorsize = sizeof(struct volStructDesc);
622         else
623                 sectorsize = sb->s_blocksize;
624
625         sector += (sbi->s_session << sb->s_blocksize_bits);
626
627         udf_debug("Starting at sector %u (%ld byte sectors)\n",
628                   (unsigned int)(sector >> sb->s_blocksize_bits),
629                   sb->s_blocksize);
630         /* Process the sequence (if applicable) */
631         for (; !nsr02 && !nsr03; sector += sectorsize) {
632                 /* Read a block */
633                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
634                 if (!bh)
635                         break;
636
637                 /* Look for ISO  descriptors */
638                 vsd = (struct volStructDesc *)(bh->b_data +
639                                               (sector & (sb->s_blocksize - 1)));
640
641                 if (vsd->stdIdent[0] == 0) {
642                         brelse(bh);
643                         break;
644                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
645                                     VSD_STD_ID_LEN)) {
646                         switch (vsd->structType) {
647                         case 0:
648                                 udf_debug("ISO9660 Boot Record found\n");
649                                 break;
650                         case 1:
651                                 udf_debug("ISO9660 Primary Volume Descriptor "
652                                           "found\n");
653                                 break;
654                         case 2:
655                                 udf_debug("ISO9660 Supplementary Volume "
656                                           "Descriptor found\n");
657                                 break;
658                         case 3:
659                                 udf_debug("ISO9660 Volume Partition Descriptor "
660                                           "found\n");
661                                 break;
662                         case 255:
663                                 udf_debug("ISO9660 Volume Descriptor Set "
664                                           "Terminator found\n");
665                                 break;
666                         default:
667                                 udf_debug("ISO9660 VRS (%u) found\n",
668                                           vsd->structType);
669                                 break;
670                         }
671                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
672                                     VSD_STD_ID_LEN))
673                         ; /* nothing */
674                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
675                                     VSD_STD_ID_LEN)) {
676                         brelse(bh);
677                         break;
678                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
679                                     VSD_STD_ID_LEN))
680                         nsr02 = sector;
681                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
682                                     VSD_STD_ID_LEN))
683                         nsr03 = sector;
684                 brelse(bh);
685         }
686
687         if (nsr03)
688                 return nsr03;
689         else if (nsr02)
690                 return nsr02;
691         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
692                 return -1;
693         else
694                 return 0;
695 }
696
697 static int udf_find_fileset(struct super_block *sb,
698                             struct kernel_lb_addr *fileset,
699                             struct kernel_lb_addr *root)
700 {
701         struct buffer_head *bh = NULL;
702         long lastblock;
703         uint16_t ident;
704         struct udf_sb_info *sbi;
705
706         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
707             fileset->partitionReferenceNum != 0xFFFF) {
708                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
709
710                 if (!bh) {
711                         return 1;
712                 } else if (ident != TAG_IDENT_FSD) {
713                         brelse(bh);
714                         return 1;
715                 }
716
717         }
718
719         sbi = UDF_SB(sb);
720         if (!bh) {
721                 /* Search backwards through the partitions */
722                 struct kernel_lb_addr newfileset;
723
724 /* --> cvg: FIXME - is it reasonable? */
725                 return 1;
726
727                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
728                      (newfileset.partitionReferenceNum != 0xFFFF &&
729                       fileset->logicalBlockNum == 0xFFFFFFFF &&
730                       fileset->partitionReferenceNum == 0xFFFF);
731                      newfileset.partitionReferenceNum--) {
732                         lastblock = sbi->s_partmaps
733                                         [newfileset.partitionReferenceNum]
734                                                 .s_partition_len;
735                         newfileset.logicalBlockNum = 0;
736
737                         do {
738                                 bh = udf_read_ptagged(sb, &newfileset, 0,
739                                                       &ident);
740                                 if (!bh) {
741                                         newfileset.logicalBlockNum++;
742                                         continue;
743                                 }
744
745                                 switch (ident) {
746                                 case TAG_IDENT_SBD:
747                                 {
748                                         struct spaceBitmapDesc *sp;
749                                         sp = (struct spaceBitmapDesc *)
750                                                                 bh->b_data;
751                                         newfileset.logicalBlockNum += 1 +
752                                                 ((le32_to_cpu(sp->numOfBytes) +
753                                                   sizeof(struct spaceBitmapDesc)
754                                                   - 1) >> sb->s_blocksize_bits);
755                                         brelse(bh);
756                                         break;
757                                 }
758                                 case TAG_IDENT_FSD:
759                                         *fileset = newfileset;
760                                         break;
761                                 default:
762                                         newfileset.logicalBlockNum++;
763                                         brelse(bh);
764                                         bh = NULL;
765                                         break;
766                                 }
767                         } while (newfileset.logicalBlockNum < lastblock &&
768                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
769                                  fileset->partitionReferenceNum == 0xFFFF);
770                 }
771         }
772
773         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
774              fileset->partitionReferenceNum != 0xFFFF) && bh) {
775                 udf_debug("Fileset at block=%d, partition=%d\n",
776                           fileset->logicalBlockNum,
777                           fileset->partitionReferenceNum);
778
779                 sbi->s_partition = fileset->partitionReferenceNum;
780                 udf_load_fileset(sb, bh, root);
781                 brelse(bh);
782                 return 0;
783         }
784         return 1;
785 }
786
787 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
788 {
789         struct primaryVolDesc *pvoldesc;
790         struct ustr *instr, *outstr;
791         struct buffer_head *bh;
792         uint16_t ident;
793         int ret = 1;
794
795         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
796         if (!instr)
797                 return 1;
798
799         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
800         if (!outstr)
801                 goto out1;
802
803         bh = udf_read_tagged(sb, block, block, &ident);
804         if (!bh)
805                 goto out2;
806
807         BUG_ON(ident != TAG_IDENT_PVD);
808
809         pvoldesc = (struct primaryVolDesc *)bh->b_data;
810
811         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
812                               pvoldesc->recordingDateAndTime)) {
813 #ifdef UDFFS_DEBUG
814                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
815                 udf_debug("recording time %04u/%02u/%02u"
816                           " %02u:%02u (%x)\n",
817                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
818                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
819 #endif
820         }
821
822         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
823                 if (udf_CS0toUTF8(outstr, instr)) {
824                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
825                                 outstr->u_len > 31 ? 31 : outstr->u_len);
826                         udf_debug("volIdent[] = '%s'\n",
827                                         UDF_SB(sb)->s_volume_ident);
828                 }
829
830         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
831                 if (udf_CS0toUTF8(outstr, instr))
832                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
833
834         brelse(bh);
835         ret = 0;
836 out2:
837         kfree(outstr);
838 out1:
839         kfree(instr);
840         return ret;
841 }
842
843 static int udf_load_metadata_files(struct super_block *sb, int partition)
844 {
845         struct udf_sb_info *sbi = UDF_SB(sb);
846         struct udf_part_map *map;
847         struct udf_meta_data *mdata;
848         struct kernel_lb_addr addr;
849         int fe_error = 0;
850
851         map = &sbi->s_partmaps[partition];
852         mdata = &map->s_type_specific.s_metadata;
853
854         /* metadata address */
855         addr.logicalBlockNum =  mdata->s_meta_file_loc;
856         addr.partitionReferenceNum = map->s_partition_num;
857
858         udf_debug("Metadata file location: block = %d part = %d\n",
859                           addr.logicalBlockNum, addr.partitionReferenceNum);
860
861         mdata->s_metadata_fe = udf_iget(sb, &addr);
862
863         if (mdata->s_metadata_fe == NULL) {
864                 udf_warning(sb, __func__, "metadata inode efe not found, "
865                                 "will try mirror inode.");
866                 fe_error = 1;
867         } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
868                  ICBTAG_FLAG_AD_SHORT) {
869                 udf_warning(sb, __func__, "metadata inode efe does not have "
870                         "short allocation descriptors!");
871                 fe_error = 1;
872                 iput(mdata->s_metadata_fe);
873                 mdata->s_metadata_fe = NULL;
874         }
875
876         /* mirror file entry */
877         addr.logicalBlockNum = mdata->s_mirror_file_loc;
878         addr.partitionReferenceNum = map->s_partition_num;
879
880         udf_debug("Mirror metadata file location: block = %d part = %d\n",
881                           addr.logicalBlockNum, addr.partitionReferenceNum);
882
883         mdata->s_mirror_fe = udf_iget(sb, &addr);
884
885         if (mdata->s_mirror_fe == NULL) {
886                 if (fe_error) {
887                         udf_error(sb, __func__, "mirror inode efe not found "
888                         "and metadata inode is missing too, exiting...");
889                         goto error_exit;
890                 } else
891                         udf_warning(sb, __func__, "mirror inode efe not found,"
892                                         " but metadata inode is OK");
893         } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
894                  ICBTAG_FLAG_AD_SHORT) {
895                 udf_warning(sb, __func__, "mirror inode efe does not have "
896                         "short allocation descriptors!");
897                 iput(mdata->s_mirror_fe);
898                 mdata->s_mirror_fe = NULL;
899                 if (fe_error)
900                         goto error_exit;
901         }
902
903         /*
904          * bitmap file entry
905          * Note:
906          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
907         */
908         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
909                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
910                 addr.partitionReferenceNum = map->s_partition_num;
911
912                 udf_debug("Bitmap file location: block = %d part = %d\n",
913                         addr.logicalBlockNum, addr.partitionReferenceNum);
914
915                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
916
917                 if (mdata->s_bitmap_fe == NULL) {
918                         if (sb->s_flags & MS_RDONLY)
919                                 udf_warning(sb, __func__, "bitmap inode efe "
920                                         "not found but it's ok since the disc"
921                                         " is mounted read-only");
922                         else {
923                                 udf_error(sb, __func__, "bitmap inode efe not "
924                                         "found and attempted read-write mount");
925                                 goto error_exit;
926                         }
927                 }
928         }
929
930         udf_debug("udf_load_metadata_files Ok\n");
931
932         return 0;
933
934 error_exit:
935         return 1;
936 }
937
938 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
939                              struct kernel_lb_addr *root)
940 {
941         struct fileSetDesc *fset;
942
943         fset = (struct fileSetDesc *)bh->b_data;
944
945         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
946
947         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
948
949         udf_debug("Rootdir at block=%d, partition=%d\n",
950                   root->logicalBlockNum, root->partitionReferenceNum);
951 }
952
953 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
954 {
955         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
956         return DIV_ROUND_UP(map->s_partition_len +
957                             (sizeof(struct spaceBitmapDesc) << 3),
958                             sb->s_blocksize * 8);
959 }
960
961 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
962 {
963         struct udf_bitmap *bitmap;
964         int nr_groups;
965         int size;
966
967         nr_groups = udf_compute_nr_groups(sb, index);
968         size = sizeof(struct udf_bitmap) +
969                 (sizeof(struct buffer_head *) * nr_groups);
970
971         if (size <= PAGE_SIZE)
972                 bitmap = kmalloc(size, GFP_KERNEL);
973         else
974                 bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
975
976         if (bitmap == NULL) {
977                 udf_error(sb, __func__,
978                           "Unable to allocate space for bitmap "
979                           "and %d buffer_head pointers", nr_groups);
980                 return NULL;
981         }
982
983         memset(bitmap, 0x00, size);
984         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
985         bitmap->s_nr_groups = nr_groups;
986         return bitmap;
987 }
988
989 static int udf_fill_partdesc_info(struct super_block *sb,
990                 struct partitionDesc *p, int p_index)
991 {
992         struct udf_part_map *map;
993         struct udf_sb_info *sbi = UDF_SB(sb);
994         struct partitionHeaderDesc *phd;
995
996         map = &sbi->s_partmaps[p_index];
997
998         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
999         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
1000
1001         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
1002                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
1003         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
1004                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
1005         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
1006                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
1007         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
1008                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
1009
1010         udf_debug("Partition (%d type %x) starts at physical %d, "
1011                   "block length %d\n", p_index,
1012                   map->s_partition_type, map->s_partition_root,
1013                   map->s_partition_len);
1014
1015         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
1016             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
1017                 return 0;
1018
1019         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
1020         if (phd->unallocSpaceTable.extLength) {
1021                 struct kernel_lb_addr loc = {
1022                         .logicalBlockNum = le32_to_cpu(
1023                                 phd->unallocSpaceTable.extPosition),
1024                         .partitionReferenceNum = p_index,
1025                 };
1026
1027                 map->s_uspace.s_table = udf_iget(sb, &loc);
1028                 if (!map->s_uspace.s_table) {
1029                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
1030                                         p_index);
1031                         return 1;
1032                 }
1033                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
1034                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
1035                                 p_index, map->s_uspace.s_table->i_ino);
1036         }
1037
1038         if (phd->unallocSpaceBitmap.extLength) {
1039                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1040                 if (!bitmap)
1041                         return 1;
1042                 map->s_uspace.s_bitmap = bitmap;
1043                 bitmap->s_extLength = le32_to_cpu(
1044                                 phd->unallocSpaceBitmap.extLength);
1045                 bitmap->s_extPosition = le32_to_cpu(
1046                                 phd->unallocSpaceBitmap.extPosition);
1047                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
1048                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index,
1049                                                 bitmap->s_extPosition);
1050         }
1051
1052         if (phd->partitionIntegrityTable.extLength)
1053                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
1054
1055         if (phd->freedSpaceTable.extLength) {
1056                 struct kernel_lb_addr loc = {
1057                         .logicalBlockNum = le32_to_cpu(
1058                                 phd->freedSpaceTable.extPosition),
1059                         .partitionReferenceNum = p_index,
1060                 };
1061
1062                 map->s_fspace.s_table = udf_iget(sb, &loc);
1063                 if (!map->s_fspace.s_table) {
1064                         udf_debug("cannot load freedSpaceTable (part %d)\n",
1065                                 p_index);
1066                         return 1;
1067                 }
1068
1069                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
1070                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
1071                                 p_index, map->s_fspace.s_table->i_ino);
1072         }
1073
1074         if (phd->freedSpaceBitmap.extLength) {
1075                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
1076                 if (!bitmap)
1077                         return 1;
1078                 map->s_fspace.s_bitmap = bitmap;
1079                 bitmap->s_extLength = le32_to_cpu(
1080                                 phd->freedSpaceBitmap.extLength);
1081                 bitmap->s_extPosition = le32_to_cpu(
1082                                 phd->freedSpaceBitmap.extPosition);
1083                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
1084                 udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index,
1085                                         bitmap->s_extPosition);
1086         }
1087         return 0;
1088 }
1089
1090 static void udf_find_vat_block(struct super_block *sb, int p_index,
1091                                int type1_index, sector_t start_block)
1092 {
1093         struct udf_sb_info *sbi = UDF_SB(sb);
1094         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1095         sector_t vat_block;
1096         struct kernel_lb_addr ino;
1097
1098         /*
1099          * VAT file entry is in the last recorded block. Some broken disks have
1100          * it a few blocks before so try a bit harder...
1101          */
1102         ino.partitionReferenceNum = type1_index;
1103         for (vat_block = start_block;
1104              vat_block >= map->s_partition_root &&
1105              vat_block >= start_block - 3 &&
1106              !sbi->s_vat_inode; vat_block--) {
1107                 ino.logicalBlockNum = vat_block - map->s_partition_root;
1108                 sbi->s_vat_inode = udf_iget(sb, &ino);
1109         }
1110 }
1111
1112 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
1113 {
1114         struct udf_sb_info *sbi = UDF_SB(sb);
1115         struct udf_part_map *map = &sbi->s_partmaps[p_index];
1116         struct buffer_head *bh = NULL;
1117         struct udf_inode_info *vati;
1118         uint32_t pos;
1119         struct virtualAllocationTable20 *vat20;
1120         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
1121
1122         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
1123         if (!sbi->s_vat_inode &&
1124             sbi->s_last_block != blocks - 1) {
1125                 printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the"
1126                        " last recorded block (%lu), retrying with the last "
1127                        "block of the device (%lu).\n",
1128                        (unsigned long)sbi->s_last_block,
1129                        (unsigned long)blocks - 1);
1130                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
1131         }
1132         if (!sbi->s_vat_inode)
1133                 return 1;
1134
1135         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
1136                 map->s_type_specific.s_virtual.s_start_offset = 0;
1137                 map->s_type_specific.s_virtual.s_num_entries =
1138                         (sbi->s_vat_inode->i_size - 36) >> 2;
1139         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
1140                 vati = UDF_I(sbi->s_vat_inode);
1141                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
1142                         pos = udf_block_map(sbi->s_vat_inode, 0);
1143                         bh = sb_bread(sb, pos);
1144                         if (!bh)
1145                                 return 1;
1146                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
1147                 } else {
1148                         vat20 = (struct virtualAllocationTable20 *)
1149                                                         vati->i_ext.i_data;
1150                 }
1151
1152                 map->s_type_specific.s_virtual.s_start_offset =
1153                         le16_to_cpu(vat20->lengthHeader);
1154                 map->s_type_specific.s_virtual.s_num_entries =
1155                         (sbi->s_vat_inode->i_size -
1156                                 map->s_type_specific.s_virtual.
1157                                         s_start_offset) >> 2;
1158                 brelse(bh);
1159         }
1160         return 0;
1161 }
1162
1163 static int udf_load_partdesc(struct super_block *sb, sector_t block)
1164 {
1165         struct buffer_head *bh;
1166         struct partitionDesc *p;
1167         struct udf_part_map *map;
1168         struct udf_sb_info *sbi = UDF_SB(sb);
1169         int i, type1_idx;
1170         uint16_t partitionNumber;
1171         uint16_t ident;
1172         int ret = 0;
1173
1174         bh = udf_read_tagged(sb, block, block, &ident);
1175         if (!bh)
1176                 return 1;
1177         if (ident != TAG_IDENT_PD)
1178                 goto out_bh;
1179
1180         p = (struct partitionDesc *)bh->b_data;
1181         partitionNumber = le16_to_cpu(p->partitionNumber);
1182
1183         /* First scan for TYPE1, SPARABLE and METADATA partitions */
1184         for (i = 0; i < sbi->s_partitions; i++) {
1185                 map = &sbi->s_partmaps[i];
1186                 udf_debug("Searching map: (%d == %d)\n",
1187                           map->s_partition_num, partitionNumber);
1188                 if (map->s_partition_num == partitionNumber &&
1189                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
1190                      map->s_partition_type == UDF_SPARABLE_MAP15))
1191                         break;
1192         }
1193
1194         if (i >= sbi->s_partitions) {
1195                 udf_debug("Partition (%d) not found in partition map\n",
1196                           partitionNumber);
1197                 goto out_bh;
1198         }
1199
1200         ret = udf_fill_partdesc_info(sb, p, i);
1201
1202         /*
1203          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
1204          * PHYSICAL partitions are already set up
1205          */
1206         type1_idx = i;
1207         for (i = 0; i < sbi->s_partitions; i++) {
1208                 map = &sbi->s_partmaps[i];
1209
1210                 if (map->s_partition_num == partitionNumber &&
1211                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
1212                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
1213                      map->s_partition_type == UDF_METADATA_MAP25))
1214                         break;
1215         }
1216
1217         if (i >= sbi->s_partitions)
1218                 goto out_bh;
1219
1220         ret = udf_fill_partdesc_info(sb, p, i);
1221         if (ret)
1222                 goto out_bh;
1223
1224         if (map->s_partition_type == UDF_METADATA_MAP25) {
1225                 ret = udf_load_metadata_files(sb, i);
1226                 if (ret) {
1227                         printk(KERN_ERR "UDF-fs: error loading MetaData "
1228                         "partition map %d\n", i);
1229                         goto out_bh;
1230                 }
1231         } else {
1232                 ret = udf_load_vat(sb, i, type1_idx);
1233                 if (ret)
1234                         goto out_bh;
1235                 /*
1236                  * Mark filesystem read-only if we have a partition with
1237                  * virtual map since we don't handle writing to it (we
1238                  * overwrite blocks instead of relocating them).
1239                  */
1240                 sb->s_flags |= MS_RDONLY;
1241                 printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
1242                         "because writing to pseudooverwrite partition is "
1243                         "not implemented.\n");
1244         }
1245 out_bh:
1246         /* In case loading failed, we handle cleanup in udf_fill_super */
1247         brelse(bh);
1248         return ret;
1249 }
1250
1251 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
1252                                struct kernel_lb_addr *fileset)
1253 {
1254         struct logicalVolDesc *lvd;
1255         int i, j, offset;
1256         uint8_t type;
1257         struct udf_sb_info *sbi = UDF_SB(sb);
1258         struct genericPartitionMap *gpm;
1259         uint16_t ident;
1260         struct buffer_head *bh;
1261         int ret = 0;
1262
1263         bh = udf_read_tagged(sb, block, block, &ident);
1264         if (!bh)
1265                 return 1;
1266         BUG_ON(ident != TAG_IDENT_LVD);
1267         lvd = (struct logicalVolDesc *)bh->b_data;
1268
1269         i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
1270         if (i != 0) {
1271                 ret = i;
1272                 goto out_bh;
1273         }
1274
1275         for (i = 0, offset = 0;
1276              i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
1277              i++, offset += gpm->partitionMapLength) {
1278                 struct udf_part_map *map = &sbi->s_partmaps[i];
1279                 gpm = (struct genericPartitionMap *)
1280                                 &(lvd->partitionMaps[offset]);
1281                 type = gpm->partitionMapType;
1282                 if (type == 1) {
1283                         struct genericPartitionMap1 *gpm1 =
1284                                 (struct genericPartitionMap1 *)gpm;
1285                         map->s_partition_type = UDF_TYPE1_MAP15;
1286                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
1287                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
1288                         map->s_partition_func = NULL;
1289                 } else if (type == 2) {
1290                         struct udfPartitionMap2 *upm2 =
1291                                                 (struct udfPartitionMap2 *)gpm;
1292                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
1293                                                 strlen(UDF_ID_VIRTUAL))) {
1294                                 u16 suf =
1295                                         le16_to_cpu(((__le16 *)upm2->partIdent.
1296                                                         identSuffix)[0]);
1297                                 if (suf < 0x0200) {
1298                                         map->s_partition_type =
1299                                                         UDF_VIRTUAL_MAP15;
1300                                         map->s_partition_func =
1301                                                         udf_get_pblock_virt15;
1302                                 } else {
1303                                         map->s_partition_type =
1304                                                         UDF_VIRTUAL_MAP20;
1305                                         map->s_partition_func =
1306                                                         udf_get_pblock_virt20;
1307                                 }
1308                         } else if (!strncmp(upm2->partIdent.ident,
1309                                                 UDF_ID_SPARABLE,
1310                                                 strlen(UDF_ID_SPARABLE))) {
1311                                 uint32_t loc;
1312                                 struct sparingTable *st;
1313                                 struct sparablePartitionMap *spm =
1314                                         (struct sparablePartitionMap *)gpm;
1315
1316                                 map->s_partition_type = UDF_SPARABLE_MAP15;
1317                                 map->s_type_specific.s_sparing.s_packet_len =
1318                                                 le16_to_cpu(spm->packetLength);
1319                                 for (j = 0; j < spm->numSparingTables; j++) {
1320                                         struct buffer_head *bh2;
1321
1322                                         loc = le32_to_cpu(
1323                                                 spm->locSparingTable[j]);
1324                                         bh2 = udf_read_tagged(sb, loc, loc,
1325                                                              &ident);
1326                                         map->s_type_specific.s_sparing.
1327                                                         s_spar_map[j] = bh2;
1328
1329                                         if (bh2 == NULL)
1330                                                 continue;
1331
1332                                         st = (struct sparingTable *)bh2->b_data;
1333                                         if (ident != 0 || strncmp(
1334                                                 st->sparingIdent.ident,
1335                                                 UDF_ID_SPARING,
1336                                                 strlen(UDF_ID_SPARING))) {
1337                                                 brelse(bh2);
1338                                                 map->s_type_specific.s_sparing.
1339                                                         s_spar_map[j] = NULL;
1340                                         }
1341                                 }
1342                                 map->s_partition_func = udf_get_pblock_spar15;
1343                         } else if (!strncmp(upm2->partIdent.ident,
1344                                                 UDF_ID_METADATA,
1345                                                 strlen(UDF_ID_METADATA))) {
1346                                 struct udf_meta_data *mdata =
1347                                         &map->s_type_specific.s_metadata;
1348                                 struct metadataPartitionMap *mdm =
1349                                                 (struct metadataPartitionMap *)
1350                                                 &(lvd->partitionMaps[offset]);
1351                                 udf_debug("Parsing Logical vol part %d "
1352                                         "type %d  id=%s\n", i, type,
1353                                         UDF_ID_METADATA);
1354
1355                                 map->s_partition_type = UDF_METADATA_MAP25;
1356                                 map->s_partition_func = udf_get_pblock_meta25;
1357
1358                                 mdata->s_meta_file_loc   =
1359                                         le32_to_cpu(mdm->metadataFileLoc);
1360                                 mdata->s_mirror_file_loc =
1361                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
1362                                 mdata->s_bitmap_file_loc =
1363                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
1364                                 mdata->s_alloc_unit_size =
1365                                         le32_to_cpu(mdm->allocUnitSize);
1366                                 mdata->s_align_unit_size =
1367                                         le16_to_cpu(mdm->alignUnitSize);
1368                                 mdata->s_dup_md_flag     =
1369                                         mdm->flags & 0x01;
1370
1371                                 udf_debug("Metadata Ident suffix=0x%x\n",
1372                                         (le16_to_cpu(
1373                                          ((__le16 *)
1374                                               mdm->partIdent.identSuffix)[0])));
1375                                 udf_debug("Metadata part num=%d\n",
1376                                         le16_to_cpu(mdm->partitionNum));
1377                                 udf_debug("Metadata part alloc unit size=%d\n",
1378                                         le32_to_cpu(mdm->allocUnitSize));
1379                                 udf_debug("Metadata file loc=%d\n",
1380                                         le32_to_cpu(mdm->metadataFileLoc));
1381                                 udf_debug("Mirror file loc=%d\n",
1382                                        le32_to_cpu(mdm->metadataMirrorFileLoc));
1383                                 udf_debug("Bitmap file loc=%d\n",
1384                                        le32_to_cpu(mdm->metadataBitmapFileLoc));
1385                                 udf_debug("Duplicate Flag: %d %d\n",
1386                                         mdata->s_dup_md_flag, mdm->flags);
1387                         } else {
1388                                 udf_debug("Unknown ident: %s\n",
1389                                           upm2->partIdent.ident);
1390                                 continue;
1391                         }
1392                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
1393                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
1394                 }
1395                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
1396                           i, map->s_partition_num, type,
1397                           map->s_volumeseqnum);
1398         }
1399
1400         if (fileset) {
1401                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
1402
1403                 *fileset = lelb_to_cpu(la->extLocation);
1404                 udf_debug("FileSet found in LogicalVolDesc at block=%d, "
1405                           "partition=%d\n", fileset->logicalBlockNum,
1406                           fileset->partitionReferenceNum);
1407         }
1408         if (lvd->integritySeqExt.extLength)
1409                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
1410
1411 out_bh:
1412         brelse(bh);
1413         return ret;
1414 }
1415
1416 /*
1417  * udf_load_logicalvolint
1418  *
1419  */
1420 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
1421 {
1422         struct buffer_head *bh = NULL;
1423         uint16_t ident;
1424         struct udf_sb_info *sbi = UDF_SB(sb);
1425         struct logicalVolIntegrityDesc *lvid;
1426
1427         while (loc.extLength > 0 &&
1428                (bh = udf_read_tagged(sb, loc.extLocation,
1429                                      loc.extLocation, &ident)) &&
1430                ident == TAG_IDENT_LVID) {
1431                 sbi->s_lvid_bh = bh;
1432                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1433
1434                 if (lvid->nextIntegrityExt.extLength)
1435                         udf_load_logicalvolint(sb,
1436                                 leea_to_cpu(lvid->nextIntegrityExt));
1437
1438                 if (sbi->s_lvid_bh != bh)
1439                         brelse(bh);
1440                 loc.extLength -= sb->s_blocksize;
1441                 loc.extLocation++;
1442         }
1443         if (sbi->s_lvid_bh != bh)
1444                 brelse(bh);
1445 }
1446
1447 /*
1448  * udf_process_sequence
1449  *
1450  * PURPOSE
1451  *      Process a main/reserve volume descriptor sequence.
1452  *
1453  * PRE-CONDITIONS
1454  *      sb                      Pointer to _locked_ superblock.
1455  *      block                   First block of first extent of the sequence.
1456  *      lastblock               Lastblock of first extent of the sequence.
1457  *
1458  * HISTORY
1459  *      July 1, 1997 - Andrew E. Mileski
1460  *      Written, tested, and released.
1461  */
1462 static noinline int udf_process_sequence(struct super_block *sb, long block,
1463                                 long lastblock, struct kernel_lb_addr *fileset)
1464 {
1465         struct buffer_head *bh = NULL;
1466         struct udf_vds_record vds[VDS_POS_LENGTH];
1467         struct udf_vds_record *curr;
1468         struct generic_desc *gd;
1469         struct volDescPtr *vdp;
1470         int done = 0;
1471         uint32_t vdsn;
1472         uint16_t ident;
1473         long next_s = 0, next_e = 0;
1474
1475         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
1476
1477         /*
1478          * Read the main descriptor sequence and find which descriptors
1479          * are in it.
1480          */
1481         for (; (!done && block <= lastblock); block++) {
1482
1483                 bh = udf_read_tagged(sb, block, block, &ident);
1484                 if (!bh) {
1485                         printk(KERN_ERR "udf: Block %Lu of volume descriptor "
1486                                "sequence is corrupted or we could not read "
1487                                "it.\n", (unsigned long long)block);
1488                         return 1;
1489                 }
1490
1491                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
1492                 gd = (struct generic_desc *)bh->b_data;
1493                 vdsn = le32_to_cpu(gd->volDescSeqNum);
1494                 switch (ident) {
1495                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
1496                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
1497                         if (vdsn >= curr->volDescSeqNum) {
1498                                 curr->volDescSeqNum = vdsn;
1499                                 curr->block = block;
1500                         }
1501                         break;
1502                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
1503                         curr = &vds[VDS_POS_VOL_DESC_PTR];
1504                         if (vdsn >= curr->volDescSeqNum) {
1505                                 curr->volDescSeqNum = vdsn;
1506                                 curr->block = block;
1507
1508                                 vdp = (struct volDescPtr *)bh->b_data;
1509                                 next_s = le32_to_cpu(
1510                                         vdp->nextVolDescSeqExt.extLocation);
1511                                 next_e = le32_to_cpu(
1512                                         vdp->nextVolDescSeqExt.extLength);
1513                                 next_e = next_e >> sb->s_blocksize_bits;
1514                                 next_e += next_s;
1515                         }
1516                         break;
1517                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
1518                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
1519                         if (vdsn >= curr->volDescSeqNum) {
1520                                 curr->volDescSeqNum = vdsn;
1521                                 curr->block = block;
1522                         }
1523                         break;
1524                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
1525                         curr = &vds[VDS_POS_PARTITION_DESC];
1526                         if (!curr->block)
1527                                 curr->block = block;
1528                         break;
1529                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
1530                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
1531                         if (vdsn >= curr->volDescSeqNum) {
1532                                 curr->volDescSeqNum = vdsn;
1533                                 curr->block = block;
1534                         }
1535                         break;
1536                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
1537                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
1538                         if (vdsn >= curr->volDescSeqNum) {
1539                                 curr->volDescSeqNum = vdsn;
1540                                 curr->block = block;
1541                         }
1542                         break;
1543                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
1544                         vds[VDS_POS_TERMINATING_DESC].block = block;
1545                         if (next_e) {
1546                                 block = next_s;
1547                                 lastblock = next_e;
1548                                 next_s = next_e = 0;
1549                         } else
1550                                 done = 1;
1551                         break;
1552                 }
1553                 brelse(bh);
1554         }
1555         /*
1556          * Now read interesting descriptors again and process them
1557          * in a suitable order
1558          */
1559         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
1560                 printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
1561                 return 1;
1562         }
1563         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
1564                 return 1;
1565
1566         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
1567             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
1568                 return 1;
1569
1570         if (vds[VDS_POS_PARTITION_DESC].block) {
1571                 /*
1572                  * We rescan the whole descriptor sequence to find
1573                  * partition descriptor blocks and process them.
1574                  */
1575                 for (block = vds[VDS_POS_PARTITION_DESC].block;
1576                      block < vds[VDS_POS_TERMINATING_DESC].block;
1577                      block++)
1578                         if (udf_load_partdesc(sb, block))
1579                                 return 1;
1580         }
1581
1582         return 0;
1583 }
1584
1585 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
1586                              struct kernel_lb_addr *fileset)
1587 {
1588         struct anchorVolDescPtr *anchor;
1589         long main_s, main_e, reserve_s, reserve_e;
1590         struct udf_sb_info *sbi;
1591
1592         sbi = UDF_SB(sb);
1593         anchor = (struct anchorVolDescPtr *)bh->b_data;
1594
1595         /* Locate the main sequence */
1596         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
1597         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
1598         main_e = main_e >> sb->s_blocksize_bits;
1599         main_e += main_s;
1600
1601         /* Locate the reserve sequence */
1602         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
1603         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
1604         reserve_e = reserve_e >> sb->s_blocksize_bits;
1605         reserve_e += reserve_s;
1606
1607         /* Process the main & reserve sequences */
1608         /* responsible for finding the PartitionDesc(s) */
1609         if (!udf_process_sequence(sb, main_s, main_e, fileset))
1610                 return 1;
1611         return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
1612 }
1613
1614 /*
1615  * Check whether there is an anchor block in the given block and
1616  * load Volume Descriptor Sequence if so.
1617  */
1618 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
1619                                   struct kernel_lb_addr *fileset)
1620 {
1621         struct buffer_head *bh;
1622         uint16_t ident;
1623         int ret;
1624
1625         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
1626             udf_fixed_to_variable(block) >=
1627             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
1628                 return 0;
1629
1630         bh = udf_read_tagged(sb, block, block, &ident);
1631         if (!bh)
1632                 return 0;
1633         if (ident != TAG_IDENT_AVDP) {
1634                 brelse(bh);
1635                 return 0;
1636         }
1637         ret = udf_load_sequence(sb, bh, fileset);
1638         brelse(bh);
1639         return ret;
1640 }
1641
1642 /* Search for an anchor volume descriptor pointer */
1643 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
1644                                  struct kernel_lb_addr *fileset)
1645 {
1646         sector_t last[6];
1647         int i;
1648         struct udf_sb_info *sbi = UDF_SB(sb);
1649         int last_count = 0;
1650
1651         /* First try user provided anchor */
1652         if (sbi->s_anchor) {
1653                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
1654                         return lastblock;
1655         }
1656         /*
1657          * according to spec, anchor is in either:
1658          *     block 256
1659          *     lastblock-256
1660          *     lastblock
1661          *  however, if the disc isn't closed, it could be 512.
1662          */
1663         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
1664                 return lastblock;
1665         /*
1666          * The trouble is which block is the last one. Drives often misreport
1667          * this so we try various possibilities.
1668          */
1669         last[last_count++] = lastblock;
1670         if (lastblock >= 1)
1671                 last[last_count++] = lastblock - 1;
1672         last[last_count++] = lastblock + 1;
1673         if (lastblock >= 2)
1674                 last[last_count++] = lastblock - 2;
1675         if (lastblock >= 150)
1676                 last[last_count++] = lastblock - 150;
1677         if (lastblock >= 152)
1678                 last[last_count++] = lastblock - 152;
1679
1680         for (i = 0; i < last_count; i++) {
1681                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
1682                                 sb->s_blocksize_bits)
1683                         continue;
1684                 if (udf_check_anchor_block(sb, last[i], fileset))
1685                         return last[i];
1686                 if (last[i] < 256)
1687                         continue;
1688                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
1689                         return last[i];
1690         }
1691
1692         /* Finally try block 512 in case media is open */
1693         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
1694                 return last[0];
1695         return 0;
1696 }
1697
1698 /*
1699  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
1700  * area specified by it. The function expects sbi->s_lastblock to be the last
1701  * block on the media.
1702  *
1703  * Return 1 if ok, 0 if not found.
1704  *
1705  */
1706 static int udf_find_anchor(struct super_block *sb,
1707                            struct kernel_lb_addr *fileset)
1708 {
1709         sector_t lastblock;
1710         struct udf_sb_info *sbi = UDF_SB(sb);
1711
1712         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1713         if (lastblock)
1714                 goto out;
1715
1716         /* No anchor found? Try VARCONV conversion of block numbers */
1717         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
1718         /* Firstly, we try to not convert number of the last block */
1719         lastblock = udf_scan_anchors(sb,
1720                                 udf_variable_to_fixed(sbi->s_last_block),
1721                                 fileset);
1722         if (lastblock)
1723                 goto out;
1724
1725         /* Secondly, we try with converted number of the last block */
1726         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
1727         if (!lastblock) {
1728                 /* VARCONV didn't help. Clear it. */
1729                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
1730                 return 0;
1731         }
1732 out:
1733         sbi->s_last_block = lastblock;
1734         return 1;
1735 }
1736
1737 /*
1738  * Check Volume Structure Descriptor, find Anchor block and load Volume
1739  * Descriptor Sequence
1740  */
1741 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
1742                         int silent, struct kernel_lb_addr *fileset)
1743 {
1744         struct udf_sb_info *sbi = UDF_SB(sb);
1745         loff_t nsr_off;
1746
1747         if (!sb_set_blocksize(sb, uopt->blocksize)) {
1748                 if (!silent)
1749                         printk(KERN_WARNING "UDF-fs: Bad block size\n");
1750                 return 0;
1751         }
1752         sbi->s_last_block = uopt->lastblock;
1753         if (!uopt->novrs) {
1754                 /* Check that it is NSR02 compliant */
1755                 nsr_off = udf_check_vsd(sb);
1756                 if (!nsr_off) {
1757                         if (!silent)
1758                                 printk(KERN_WARNING "UDF-fs: No VRS found\n");
1759                         return 0;
1760                 }
1761                 if (nsr_off == -1)
1762                         udf_debug("Failed to read byte 32768. Assuming open "
1763                                   "disc. Skipping validity check\n");
1764                 if (!sbi->s_last_block)
1765                         sbi->s_last_block = udf_get_last_block(sb);
1766         } else {
1767                 udf_debug("Validity check skipped because of novrs option\n");
1768         }
1769
1770         /* Look for anchor block and load Volume Descriptor Sequence */
1771         sbi->s_anchor = uopt->anchor;
1772         if (!udf_find_anchor(sb, fileset)) {
1773                 if (!silent)
1774                         printk(KERN_WARNING "UDF-fs: No anchor found\n");
1775                 return 0;
1776         }
1777         return 1;
1778 }
1779
1780 static void udf_open_lvid(struct super_block *sb)
1781 {
1782         struct udf_sb_info *sbi = UDF_SB(sb);
1783         struct buffer_head *bh = sbi->s_lvid_bh;
1784         struct logicalVolIntegrityDesc *lvid;
1785         struct logicalVolIntegrityDescImpUse *lvidiu;
1786
1787         if (!bh)
1788                 return;
1789         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1790         lvidiu = udf_sb_lvidiu(sbi);
1791
1792         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1793         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1794         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
1795                                 CURRENT_TIME);
1796         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
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         mark_buffer_dirty(bh);
1804         sbi->s_lvid_dirty = 0;
1805 }
1806
1807 static void udf_close_lvid(struct super_block *sb)
1808 {
1809         struct udf_sb_info *sbi = UDF_SB(sb);
1810         struct buffer_head *bh = sbi->s_lvid_bh;
1811         struct logicalVolIntegrityDesc *lvid;
1812         struct logicalVolIntegrityDescImpUse *lvidiu;
1813
1814         if (!bh)
1815                 return;
1816
1817         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
1818         lvidiu = udf_sb_lvidiu(sbi);
1819         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
1820         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
1821         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
1822         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
1823                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
1824         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
1825                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
1826         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
1827                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
1828         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
1829
1830         lvid->descTag.descCRC = cpu_to_le16(
1831                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
1832                                 le16_to_cpu(lvid->descTag.descCRCLength)));
1833
1834         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
1835         mark_buffer_dirty(bh);
1836         sbi->s_lvid_dirty = 0;
1837 }
1838
1839 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
1840 {
1841         int i;
1842         int nr_groups = bitmap->s_nr_groups;
1843         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
1844                                                 nr_groups);
1845
1846         for (i = 0; i < nr_groups; i++)
1847                 if (bitmap->s_block_bitmap[i])
1848                         brelse(bitmap->s_block_bitmap[i]);
1849
1850         if (size <= PAGE_SIZE)
1851                 kfree(bitmap);
1852         else
1853                 vfree(bitmap);
1854 }
1855
1856 static void udf_free_partition(struct udf_part_map *map)
1857 {
1858         int i;
1859         struct udf_meta_data *mdata;
1860
1861         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
1862                 iput(map->s_uspace.s_table);
1863         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
1864                 iput(map->s_fspace.s_table);
1865         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
1866                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
1867         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
1868                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
1869         if (map->s_partition_type == UDF_SPARABLE_MAP15)
1870                 for (i = 0; i < 4; i++)
1871                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
1872         else if (map->s_partition_type == UDF_METADATA_MAP25) {
1873                 mdata = &map->s_type_specific.s_metadata;
1874                 iput(mdata->s_metadata_fe);
1875                 mdata->s_metadata_fe = NULL;
1876
1877                 iput(mdata->s_mirror_fe);
1878                 mdata->s_mirror_fe = NULL;
1879
1880                 iput(mdata->s_bitmap_fe);
1881                 mdata->s_bitmap_fe = NULL;
1882         }
1883 }
1884
1885 static int udf_fill_super(struct super_block *sb, void *options, int silent)
1886 {
1887         int i;
1888         int ret;
1889         struct inode *inode = NULL;
1890         struct udf_options uopt;
1891         struct kernel_lb_addr rootdir, fileset;
1892         struct udf_sb_info *sbi;
1893
1894         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
1895         uopt.uid = -1;
1896         uopt.gid = -1;
1897         uopt.umask = 0;
1898         uopt.fmode = UDF_INVALID_MODE;
1899         uopt.dmode = UDF_INVALID_MODE;
1900
1901         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
1902         if (!sbi)
1903                 return -ENOMEM;
1904
1905         sb->s_fs_info = sbi;
1906
1907         mutex_init(&sbi->s_alloc_mutex);
1908
1909         if (!udf_parse_options((char *)options, &uopt, false))
1910                 goto error_out;
1911
1912         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
1913             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
1914                 udf_error(sb, "udf_read_super",
1915                           "utf8 cannot be combined with iocharset\n");
1916                 goto error_out;
1917         }
1918 #ifdef CONFIG_UDF_NLS
1919         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
1920                 uopt.nls_map = load_nls_default();
1921                 if (!uopt.nls_map)
1922                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
1923                 else
1924                         udf_debug("Using default NLS map\n");
1925         }
1926 #endif
1927         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
1928                 uopt.flags |= (1 << UDF_FLAG_UTF8);
1929
1930         fileset.logicalBlockNum = 0xFFFFFFFF;
1931         fileset.partitionReferenceNum = 0xFFFF;
1932
1933         sbi->s_flags = uopt.flags;
1934         sbi->s_uid = uopt.uid;
1935         sbi->s_gid = uopt.gid;
1936         sbi->s_umask = uopt.umask;
1937         sbi->s_fmode = uopt.fmode;
1938         sbi->s_dmode = uopt.dmode;
1939         sbi->s_nls_map = uopt.nls_map;
1940
1941         if (uopt.session == 0xFFFFFFFF)
1942                 sbi->s_session = udf_get_last_session(sb);
1943         else
1944                 sbi->s_session = uopt.session;
1945
1946         udf_debug("Multi-session=%d\n", sbi->s_session);
1947
1948         /* Fill in the rest of the superblock */
1949         sb->s_op = &udf_sb_ops;
1950         sb->s_export_op = &udf_export_ops;
1951         sb->dq_op = NULL;
1952         sb->s_dirt = 0;
1953         sb->s_magic = UDF_SUPER_MAGIC;
1954         sb->s_time_gran = 1000;
1955
1956         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
1957                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1958         } else {
1959                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
1960                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1961                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
1962                         if (!silent)
1963                                 printk(KERN_NOTICE
1964                                        "UDF-fs: Rescanning with blocksize "
1965                                        "%d\n", UDF_DEFAULT_BLOCKSIZE);
1966                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
1967                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
1968                 }
1969         }
1970         if (!ret) {
1971                 printk(KERN_WARNING "UDF-fs: No partition found (1)\n");
1972                 goto error_out;
1973         }
1974
1975         udf_debug("Lastblock=%d\n", sbi->s_last_block);
1976
1977         if (sbi->s_lvid_bh) {
1978                 struct logicalVolIntegrityDescImpUse *lvidiu =
1979                                                         udf_sb_lvidiu(sbi);
1980                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
1981                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
1982                 /* uint16_t maxUDFWriteRev =
1983                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
1984
1985                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
1986                         printk(KERN_ERR "UDF-fs: minUDFReadRev=%x "
1987                                         "(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                 printk(KERN_WARNING "UDF-fs: 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                 printk(KERN_NOTICE "UDF-fs: Partition marked readonly; "
2010                                    "forcing readonly mount\n");
2011                 sb->s_flags |= MS_RDONLY;
2012         }
2013
2014         if (udf_find_fileset(sb, &fileset, &rootdir)) {
2015                 printk(KERN_WARNING "UDF-fs: No fileset found\n");
2016                 goto error_out;
2017         }
2018
2019         if (!silent) {
2020                 struct timestamp ts;
2021                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
2022                 udf_info("UDF: Mounting volume '%s', "
2023                          "timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
2024                          sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day,
2025                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
2026         }
2027         if (!(sb->s_flags & MS_RDONLY))
2028                 udf_open_lvid(sb);
2029
2030         /* Assign the root inode */
2031         /* assign inodes by physical block number */
2032         /* perhaps it's not extensible enough, but for now ... */
2033         inode = udf_iget(sb, &rootdir);
2034         if (!inode) {
2035                 printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, "
2036                                 "partition=%d\n",
2037                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
2038                 goto error_out;
2039         }
2040
2041         /* Allocate a dentry for the root inode */
2042         sb->s_root = d_alloc_root(inode);
2043         if (!sb->s_root) {
2044                 printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n");
2045                 iput(inode);
2046                 goto error_out;
2047         }
2048         sb->s_maxbytes = MAX_LFS_FILESIZE;
2049         return 0;
2050
2051 error_out:
2052         if (sbi->s_vat_inode)
2053                 iput(sbi->s_vat_inode);
2054         if (sbi->s_partitions)
2055                 for (i = 0; i < sbi->s_partitions; i++)
2056                         udf_free_partition(&sbi->s_partmaps[i]);
2057 #ifdef CONFIG_UDF_NLS
2058         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2059                 unload_nls(sbi->s_nls_map);
2060 #endif
2061         if (!(sb->s_flags & MS_RDONLY))
2062                 udf_close_lvid(sb);
2063         brelse(sbi->s_lvid_bh);
2064
2065         kfree(sbi->s_partmaps);
2066         kfree(sbi);
2067         sb->s_fs_info = NULL;
2068
2069         return -EINVAL;
2070 }
2071
2072 static void udf_error(struct super_block *sb, const char *function,
2073                       const char *fmt, ...)
2074 {
2075         va_list args;
2076
2077         if (!(sb->s_flags & MS_RDONLY)) {
2078                 /* mark sb error */
2079                 sb->s_dirt = 1;
2080         }
2081         va_start(args, fmt);
2082         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2083         va_end(args);
2084         printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n",
2085                 sb->s_id, function, error_buf);
2086 }
2087
2088 void udf_warning(struct super_block *sb, const char *function,
2089                  const char *fmt, ...)
2090 {
2091         va_list args;
2092
2093         va_start(args, fmt);
2094         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
2095         va_end(args);
2096         printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n",
2097                sb->s_id, function, error_buf);
2098 }
2099
2100 static void udf_put_super(struct super_block *sb)
2101 {
2102         int i;
2103         struct udf_sb_info *sbi;
2104
2105         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
2106
2107         sbi = UDF_SB(sb);
2108
2109         lock_kernel();
2110
2111         if (sbi->s_vat_inode)
2112                 iput(sbi->s_vat_inode);
2113         if (sbi->s_partitions)
2114                 for (i = 0; i < sbi->s_partitions; i++)
2115                         udf_free_partition(&sbi->s_partmaps[i]);
2116 #ifdef CONFIG_UDF_NLS
2117         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
2118                 unload_nls(sbi->s_nls_map);
2119 #endif
2120         if (!(sb->s_flags & MS_RDONLY))
2121                 udf_close_lvid(sb);
2122         brelse(sbi->s_lvid_bh);
2123         kfree(sbi->s_partmaps);
2124         kfree(sb->s_fs_info);
2125         sb->s_fs_info = NULL;
2126
2127         unlock_kernel();
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         lock_kernel();
2191
2192         loc.logicalBlockNum = bitmap->s_extPosition;
2193         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
2194         bh = udf_read_ptagged(sb, &loc, 0, &ident);
2195
2196         if (!bh) {
2197                 printk(KERN_ERR "udf: udf_count_free failed\n");
2198                 goto out;
2199         } else if (ident != TAG_IDENT_SBD) {
2200                 brelse(bh);
2201                 printk(KERN_ERR "udf: udf_count_free failed\n");
2202                 goto out;
2203         }
2204
2205         bm = (struct spaceBitmapDesc *)bh->b_data;
2206         bytes = le32_to_cpu(bm->numOfBytes);
2207         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
2208         ptr = (uint8_t *)bh->b_data;
2209
2210         while (bytes > 0) {
2211                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
2212                 accum += bitmap_weight((const unsigned long *)(ptr + index),
2213                                         cur_bytes * 8);
2214                 bytes -= cur_bytes;
2215                 if (bytes) {
2216                         brelse(bh);
2217                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
2218                         bh = udf_tread(sb, newblock);
2219                         if (!bh) {
2220                                 udf_debug("read failed\n");
2221                                 goto out;
2222                         }
2223                         index = 0;
2224                         ptr = (uint8_t *)bh->b_data;
2225                 }
2226         }
2227         brelse(bh);
2228
2229 out:
2230         unlock_kernel();
2231
2232         return accum;
2233 }
2234
2235 static unsigned int udf_count_free_table(struct super_block *sb,
2236                                          struct inode *table)
2237 {
2238         unsigned int accum = 0;
2239         uint32_t elen;
2240         struct kernel_lb_addr eloc;
2241         int8_t etype;
2242         struct extent_position epos;
2243
2244         lock_kernel();
2245
2246         epos.block = UDF_I(table)->i_location;
2247         epos.offset = sizeof(struct unallocSpaceEntry);
2248         epos.bh = NULL;
2249
2250         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
2251                 accum += (elen >> table->i_sb->s_blocksize_bits);
2252
2253         brelse(epos.bh);
2254
2255         unlock_kernel();
2256
2257         return accum;
2258 }
2259
2260 static unsigned int udf_count_free(struct super_block *sb)
2261 {
2262         unsigned int accum = 0;
2263         struct udf_sb_info *sbi;
2264         struct udf_part_map *map;
2265
2266         sbi = UDF_SB(sb);
2267         if (sbi->s_lvid_bh) {
2268                 struct logicalVolIntegrityDesc *lvid =
2269                         (struct logicalVolIntegrityDesc *)
2270                         sbi->s_lvid_bh->b_data;
2271                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
2272                         accum = le32_to_cpu(
2273                                         lvid->freeSpaceTable[sbi->s_partition]);
2274                         if (accum == 0xFFFFFFFF)
2275                                 accum = 0;
2276                 }
2277         }
2278
2279         if (accum)
2280                 return accum;
2281
2282         map = &sbi->s_partmaps[sbi->s_partition];
2283         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
2284                 accum += udf_count_free_bitmap(sb,
2285                                                map->s_uspace.s_bitmap);
2286         }
2287         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
2288                 accum += udf_count_free_bitmap(sb,
2289                                                map->s_fspace.s_bitmap);
2290         }
2291         if (accum)
2292                 return accum;
2293
2294         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
2295                 accum += udf_count_free_table(sb,
2296                                               map->s_uspace.s_table);
2297         }
2298         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
2299                 accum += udf_count_free_table(sb,
2300                                               map->s_fspace.s_table);
2301         }
2302
2303         return accum;
2304 }