The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/super.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*
    2  * super.c
    3  *
    4  * PURPOSE
    5  *  Super block routines for the OSTA-UDF(tm) filesystem.
    6  *
    7  * DESCRIPTION
    8  *  OSTA-UDF(tm) = Optical Storage Technology Association
    9  *  Universal Disk Format.
   10  *
   11  *  This code is based on version 2.00 of the UDF specification,
   12  *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
   13  *    http://www.osta.org/
   14  *    http://www.ecma.ch/
   15  *    http://www.iso.org/
   16  *
   17  * COPYRIGHT
   18  *  This file is distributed under the terms of the GNU General Public
   19  *  License (GPL). Copies of the GPL can be obtained from:
   20  *    ftp://prep.ai.mit.edu/pub/gnu/GPL
   21  *  Each contributing author retains all rights to their own work.
   22  *
   23  *  (C) 1998 Dave Boynton
   24  *  (C) 1998-2004 Ben Fennema
   25  *  (C) 2000 Stelias Computing Inc
   26  *
   27  * HISTORY
   28  *
   29  *  09/24/98 dgb  changed to allow compiling outside of kernel, and
   30  *                added some debugging.
   31  *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
   32  *  10/16/98      attempting some multi-session support
   33  *  10/17/98      added freespace count for "df"
   34  *  11/11/98 gr   added novrs option
   35  *  11/26/98 dgb  added fileset,anchor mount options
   36  *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced
   37  *                vol descs. rewrote option handling based on isofs
   38  *  12/20/98      find the free space bitmap (if it exists)
   39  */
   40 
   41 #include "udfdecl.h"
   42 
   43 #include <linux/blkdev.h>
   44 #include <linux/slab.h>
   45 #include <linux/kernel.h>
   46 #include <linux/module.h>
   47 #include <linux/parser.h>
   48 #include <linux/stat.h>
   49 #include <linux/cdrom.h>
   50 #include <linux/nls.h>
   51 #include <linux/buffer_head.h>
   52 #include <linux/vfs.h>
   53 #include <linux/vmalloc.h>
   54 #include <linux/errno.h>
   55 #include <linux/mount.h>
   56 #include <linux/seq_file.h>
   57 #include <linux/bitmap.h>
   58 #include <linux/crc-itu-t.h>
   59 #include <linux/log2.h>
   60 #include <asm/byteorder.h>
   61 
   62 #include "udf_sb.h"
   63 #include "udf_i.h"
   64 
   65 #include <linux/init.h>
   66 #include <asm/uaccess.h>
   67 
   68 #define VDS_POS_PRIMARY_VOL_DESC        0
   69 #define VDS_POS_UNALLOC_SPACE_DESC      1
   70 #define VDS_POS_LOGICAL_VOL_DESC        2
   71 #define VDS_POS_PARTITION_DESC          3
   72 #define VDS_POS_IMP_USE_VOL_DESC        4
   73 #define VDS_POS_VOL_DESC_PTR            5
   74 #define VDS_POS_TERMINATING_DESC        6
   75 #define VDS_POS_LENGTH                  7
   76 
   77 #define UDF_DEFAULT_BLOCKSIZE 2048
   78 
   79 enum { UDF_MAX_LINKS = 0xffff };
   80 
   81 /* These are the "meat" - everything else is stuffing */
   82 static int udf_fill_super(struct super_block *, void *, int);
   83 static void udf_put_super(struct super_block *);
   84 static int udf_sync_fs(struct super_block *, int);
   85 static int udf_remount_fs(struct super_block *, int *, char *);
   86 static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
   87 static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
   88                             struct kernel_lb_addr *);
   89 static void udf_load_fileset(struct super_block *, struct buffer_head *,
   90                              struct kernel_lb_addr *);
   91 static void udf_open_lvid(struct super_block *);
   92 static void udf_close_lvid(struct super_block *);
   93 static unsigned int udf_count_free(struct super_block *);
   94 static int udf_statfs(struct dentry *, struct kstatfs *);
   95 static int udf_show_options(struct seq_file *, struct dentry *);
   96 
   97 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
   98 {
   99         struct logicalVolIntegrityDesc *lvid =
  100                 (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
  101         __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
  102         __u32 offset = number_of_partitions * 2 *
  103                                 sizeof(uint32_t)/sizeof(uint8_t);
  104         return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
  105 }
  106 
  107 /* UDF filesystem type */
  108 static struct dentry *udf_mount(struct file_system_type *fs_type,
  109                       int flags, const char *dev_name, void *data)
  110 {
  111         return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
  112 }
  113 
  114 static struct file_system_type udf_fstype = {
  115         .owner          = THIS_MODULE,
  116         .name           = "udf",
  117         .mount          = udf_mount,
  118         .kill_sb        = kill_block_super,
  119         .fs_flags       = FS_REQUIRES_DEV,
  120 };
  121 
  122 static struct kmem_cache *udf_inode_cachep;
  123 
  124 static struct inode *udf_alloc_inode(struct super_block *sb)
  125 {
  126         struct udf_inode_info *ei;
  127         ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
  128         if (!ei)
  129                 return NULL;
  130 
  131         ei->i_unique = 0;
  132         ei->i_lenExtents = 0;
  133         ei->i_next_alloc_block = 0;
  134         ei->i_next_alloc_goal = 0;
  135         ei->i_strat4096 = 0;
  136         init_rwsem(&ei->i_data_sem);
  137 
  138         return &ei->vfs_inode;
  139 }
  140 
  141 static void udf_i_callback(struct rcu_head *head)
  142 {
  143         struct inode *inode = container_of(head, struct inode, i_rcu);
  144         kmem_cache_free(udf_inode_cachep, UDF_I(inode));
  145 }
  146 
  147 static void udf_destroy_inode(struct inode *inode)
  148 {
  149         call_rcu(&inode->i_rcu, udf_i_callback);
  150 }
  151 
  152 static void init_once(void *foo)
  153 {
  154         struct udf_inode_info *ei = (struct udf_inode_info *)foo;
  155 
  156         ei->i_ext.i_data = NULL;
  157         inode_init_once(&ei->vfs_inode);
  158 }
  159 
  160 static int init_inodecache(void)
  161 {
  162         udf_inode_cachep = kmem_cache_create("udf_inode_cache",
  163                                              sizeof(struct udf_inode_info),
  164                                              0, (SLAB_RECLAIM_ACCOUNT |
  165                                                  SLAB_MEM_SPREAD),
  166                                              init_once);
  167         if (!udf_inode_cachep)
  168                 return -ENOMEM;
  169         return 0;
  170 }
  171 
  172 static void destroy_inodecache(void)
  173 {
  174         /*
  175          * Make sure all delayed rcu free inodes are flushed before we
  176          * destroy cache.
  177          */
  178         rcu_barrier();
  179         kmem_cache_destroy(udf_inode_cachep);
  180 }
  181 
  182 /* Superblock operations */
  183 static const struct super_operations udf_sb_ops = {
  184         .alloc_inode    = udf_alloc_inode,
  185         .destroy_inode  = udf_destroy_inode,
  186         .write_inode    = udf_write_inode,
  187         .evict_inode    = udf_evict_inode,
  188         .put_super      = udf_put_super,
  189         .sync_fs        = udf_sync_fs,
  190         .statfs         = udf_statfs,
  191         .remount_fs     = udf_remount_fs,
  192         .show_options   = udf_show_options,
  193 };
  194 
  195 struct udf_options {
  196         unsigned char novrs;
  197         unsigned int blocksize;
  198         unsigned int session;
  199         unsigned int lastblock;
  200         unsigned int anchor;
  201         unsigned int volume;
  202         unsigned short partition;
  203         unsigned int fileset;
  204         unsigned int rootdir;
  205         unsigned int flags;
  206         umode_t umask;
  207         kgid_t gid;
  208         kuid_t uid;
  209         umode_t fmode;
  210         umode_t dmode;
  211         struct nls_table *nls_map;
  212 };
  213 
  214 static int __init init_udf_fs(void)
  215 {
  216         int err;
  217 
  218         err = init_inodecache();
  219         if (err)
  220                 goto out1;
  221         err = register_filesystem(&udf_fstype);
  222         if (err)
  223                 goto out;
  224 
  225         return 0;
  226 
  227 out:
  228         destroy_inodecache();
  229 
  230 out1:
  231         return err;
  232 }
  233 
  234 static void __exit exit_udf_fs(void)
  235 {
  236         unregister_filesystem(&udf_fstype);
  237         destroy_inodecache();
  238 }
  239 
  240 module_init(init_udf_fs)
  241 module_exit(exit_udf_fs)
  242 
  243 static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
  244 {
  245         struct udf_sb_info *sbi = UDF_SB(sb);
  246 
  247         sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
  248                                   GFP_KERNEL);
  249         if (!sbi->s_partmaps) {
  250                 udf_err(sb, "Unable to allocate space for %d partition maps\n",
  251                         count);
  252                 sbi->s_partitions = 0;
  253                 return -ENOMEM;
  254         }
  255 
  256         sbi->s_partitions = count;
  257         return 0;
  258 }
  259 
  260 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
  261 {
  262         int i;
  263         int nr_groups = bitmap->s_nr_groups;
  264         int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
  265                                                 nr_groups);
  266 
  267         for (i = 0; i < nr_groups; i++)
  268                 if (bitmap->s_block_bitmap[i])
  269                         brelse(bitmap->s_block_bitmap[i]);
  270 
  271         if (size <= PAGE_SIZE)
  272                 kfree(bitmap);
  273         else
  274                 vfree(bitmap);
  275 }
  276 
  277 static void udf_free_partition(struct udf_part_map *map)
  278 {
  279         int i;
  280         struct udf_meta_data *mdata;
  281 
  282         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
  283                 iput(map->s_uspace.s_table);
  284         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
  285                 iput(map->s_fspace.s_table);
  286         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
  287                 udf_sb_free_bitmap(map->s_uspace.s_bitmap);
  288         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
  289                 udf_sb_free_bitmap(map->s_fspace.s_bitmap);
  290         if (map->s_partition_type == UDF_SPARABLE_MAP15)
  291                 for (i = 0; i < 4; i++)
  292                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
  293         else if (map->s_partition_type == UDF_METADATA_MAP25) {
  294                 mdata = &map->s_type_specific.s_metadata;
  295                 iput(mdata->s_metadata_fe);
  296                 mdata->s_metadata_fe = NULL;
  297 
  298                 iput(mdata->s_mirror_fe);
  299                 mdata->s_mirror_fe = NULL;
  300 
  301                 iput(mdata->s_bitmap_fe);
  302                 mdata->s_bitmap_fe = NULL;
  303         }
  304 }
  305 
  306 static void udf_sb_free_partitions(struct super_block *sb)
  307 {
  308         struct udf_sb_info *sbi = UDF_SB(sb);
  309         int i;
  310         if (sbi->s_partmaps == NULL)
  311                 return;
  312         for (i = 0; i < sbi->s_partitions; i++)
  313                 udf_free_partition(&sbi->s_partmaps[i]);
  314         kfree(sbi->s_partmaps);
  315         sbi->s_partmaps = NULL;
  316 }
  317 
  318 static int udf_show_options(struct seq_file *seq, struct dentry *root)
  319 {
  320         struct super_block *sb = root->d_sb;
  321         struct udf_sb_info *sbi = UDF_SB(sb);
  322 
  323         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
  324                 seq_puts(seq, ",nostrict");
  325         if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
  326                 seq_printf(seq, ",bs=%lu", sb->s_blocksize);
  327         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
  328                 seq_puts(seq, ",unhide");
  329         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
  330                 seq_puts(seq, ",undelete");
  331         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
  332                 seq_puts(seq, ",noadinicb");
  333         if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
  334                 seq_puts(seq, ",shortad");
  335         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
  336                 seq_puts(seq, ",uid=forget");
  337         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
  338                 seq_puts(seq, ",uid=ignore");
  339         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
  340                 seq_puts(seq, ",gid=forget");
  341         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
  342                 seq_puts(seq, ",gid=ignore");
  343         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
  344                 seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
  345         if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
  346                 seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
  347         if (sbi->s_umask != 0)
  348                 seq_printf(seq, ",umask=%ho", sbi->s_umask);
  349         if (sbi->s_fmode != UDF_INVALID_MODE)
  350                 seq_printf(seq, ",mode=%ho", sbi->s_fmode);
  351         if (sbi->s_dmode != UDF_INVALID_MODE)
  352                 seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
  353         if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
  354                 seq_printf(seq, ",session=%u", sbi->s_session);
  355         if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
  356                 seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
  357         if (sbi->s_anchor != 0)
  358                 seq_printf(seq, ",anchor=%u", sbi->s_anchor);
  359         /*
  360          * volume, partition, fileset and rootdir seem to be ignored
  361          * currently
  362          */
  363         if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
  364                 seq_puts(seq, ",utf8");
  365         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
  366                 seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
  367 
  368         return 0;
  369 }
  370 
  371 /*
  372  * udf_parse_options
  373  *
  374  * PURPOSE
  375  *      Parse mount options.
  376  *
  377  * DESCRIPTION
  378  *      The following mount options are supported:
  379  *
  380  *      gid=            Set the default group.
  381  *      umask=          Set the default umask.
  382  *      mode=           Set the default file permissions.
  383  *      dmode=          Set the default directory permissions.
  384  *      uid=            Set the default user.
  385  *      bs=             Set the block size.
  386  *      unhide          Show otherwise hidden files.
  387  *      undelete        Show deleted files in lists.
  388  *      adinicb         Embed data in the inode (default)
  389  *      noadinicb       Don't embed data in the inode
  390  *      shortad         Use short ad's
  391  *      longad          Use long ad's (default)
  392  *      nostrict        Unset strict conformance
  393  *      iocharset=      Set the NLS character set
  394  *
  395  *      The remaining are for debugging and disaster recovery:
  396  *
  397  *      novrs           Skip volume sequence recognition
  398  *
  399  *      The following expect a offset from 0.
  400  *
  401  *      session=        Set the CDROM session (default= last session)
  402  *      anchor=         Override standard anchor location. (default= 256)
  403  *      volume=         Override the VolumeDesc location. (unused)
  404  *      partition=      Override the PartitionDesc location. (unused)
  405  *      lastblock=      Set the last block of the filesystem/
  406  *
  407  *      The following expect a offset from the partition root.
  408  *
  409  *      fileset=        Override the fileset block location. (unused)
  410  *      rootdir=        Override the root directory location. (unused)
  411  *              WARNING: overriding the rootdir to a non-directory may
  412  *              yield highly unpredictable results.
  413  *
  414  * PRE-CONDITIONS
  415  *      options         Pointer to mount options string.
  416  *      uopts           Pointer to mount options variable.
  417  *
  418  * POST-CONDITIONS
  419  *      <return>        1       Mount options parsed okay.
  420  *      <return>        0       Error parsing mount options.
  421  *
  422  * HISTORY
  423  *      July 1, 1997 - Andrew E. Mileski
  424  *      Written, tested, and released.
  425  */
  426 
  427 enum {
  428         Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
  429         Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
  430         Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
  431         Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
  432         Opt_rootdir, Opt_utf8, Opt_iocharset,
  433         Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
  434         Opt_fmode, Opt_dmode
  435 };
  436 
  437 static const match_table_t tokens = {
  438         {Opt_novrs,     "novrs"},
  439         {Opt_nostrict,  "nostrict"},
  440         {Opt_bs,        "bs=%u"},
  441         {Opt_unhide,    "unhide"},
  442         {Opt_undelete,  "undelete"},
  443         {Opt_noadinicb, "noadinicb"},
  444         {Opt_adinicb,   "adinicb"},
  445         {Opt_shortad,   "shortad"},
  446         {Opt_longad,    "longad"},
  447         {Opt_uforget,   "uid=forget"},
  448         {Opt_uignore,   "uid=ignore"},
  449         {Opt_gforget,   "gid=forget"},
  450         {Opt_gignore,   "gid=ignore"},
  451         {Opt_gid,       "gid=%u"},
  452         {Opt_uid,       "uid=%u"},
  453         {Opt_umask,     "umask=%o"},
  454         {Opt_session,   "session=%u"},
  455         {Opt_lastblock, "lastblock=%u"},
  456         {Opt_anchor,    "anchor=%u"},
  457         {Opt_volume,    "volume=%u"},
  458         {Opt_partition, "partition=%u"},
  459         {Opt_fileset,   "fileset=%u"},
  460         {Opt_rootdir,   "rootdir=%u"},
  461         {Opt_utf8,      "utf8"},
  462         {Opt_iocharset, "iocharset=%s"},
  463         {Opt_fmode,     "mode=%o"},
  464         {Opt_dmode,     "dmode=%o"},
  465         {Opt_err,       NULL}
  466 };
  467 
  468 static int udf_parse_options(char *options, struct udf_options *uopt,
  469                              bool remount)
  470 {
  471         char *p;
  472         int option;
  473 
  474         uopt->novrs = 0;
  475         uopt->partition = 0xFFFF;
  476         uopt->session = 0xFFFFFFFF;
  477         uopt->lastblock = 0;
  478         uopt->anchor = 0;
  479         uopt->volume = 0xFFFFFFFF;
  480         uopt->rootdir = 0xFFFFFFFF;
  481         uopt->fileset = 0xFFFFFFFF;
  482         uopt->nls_map = NULL;
  483 
  484         if (!options)
  485                 return 1;
  486 
  487         while ((p = strsep(&options, ",")) != NULL) {
  488                 substring_t args[MAX_OPT_ARGS];
  489                 int token;
  490                 if (!*p)
  491                         continue;
  492 
  493                 token = match_token(p, tokens, args);
  494                 switch (token) {
  495                 case Opt_novrs:
  496                         uopt->novrs = 1;
  497                         break;
  498                 case Opt_bs:
  499                         if (match_int(&args[0], &option))
  500                                 return 0;
  501                         uopt->blocksize = option;
  502                         uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
  503                         break;
  504                 case Opt_unhide:
  505                         uopt->flags |= (1 << UDF_FLAG_UNHIDE);
  506                         break;
  507                 case Opt_undelete:
  508                         uopt->flags |= (1 << UDF_FLAG_UNDELETE);
  509                         break;
  510                 case Opt_noadinicb:
  511                         uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
  512                         break;
  513                 case Opt_adinicb:
  514                         uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
  515                         break;
  516                 case Opt_shortad:
  517                         uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
  518                         break;
  519                 case Opt_longad:
  520                         uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
  521                         break;
  522                 case Opt_gid:
  523                         if (match_int(args, &option))
  524                                 return 0;
  525                         uopt->gid = make_kgid(current_user_ns(), option);
  526                         if (!gid_valid(uopt->gid))
  527                                 return 0;
  528                         uopt->flags |= (1 << UDF_FLAG_GID_SET);
  529                         break;
  530                 case Opt_uid:
  531                         if (match_int(args, &option))
  532                                 return 0;
  533                         uopt->uid = make_kuid(current_user_ns(), option);
  534                         if (!uid_valid(uopt->uid))
  535                                 return 0;
  536                         uopt->flags |= (1 << UDF_FLAG_UID_SET);
  537                         break;
  538                 case Opt_umask:
  539                         if (match_octal(args, &option))
  540                                 return 0;
  541                         uopt->umask = option;
  542                         break;
  543                 case Opt_nostrict:
  544                         uopt->flags &= ~(1 << UDF_FLAG_STRICT);
  545                         break;
  546                 case Opt_session:
  547                         if (match_int(args, &option))
  548                                 return 0;
  549                         uopt->session = option;
  550                         if (!remount)
  551                                 uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
  552                         break;
  553                 case Opt_lastblock:
  554                         if (match_int(args, &option))
  555                                 return 0;
  556                         uopt->lastblock = option;
  557                         if (!remount)
  558                                 uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
  559                         break;
  560                 case Opt_anchor:
  561                         if (match_int(args, &option))
  562                                 return 0;
  563                         uopt->anchor = option;
  564                         break;
  565                 case Opt_volume:
  566                         if (match_int(args, &option))
  567                                 return 0;
  568                         uopt->volume = option;
  569                         break;
  570                 case Opt_partition:
  571                         if (match_int(args, &option))
  572                                 return 0;
  573                         uopt->partition = option;
  574                         break;
  575                 case Opt_fileset:
  576                         if (match_int(args, &option))
  577                                 return 0;
  578                         uopt->fileset = option;
  579                         break;
  580                 case Opt_rootdir:
  581                         if (match_int(args, &option))
  582                                 return 0;
  583                         uopt->rootdir = option;
  584                         break;
  585                 case Opt_utf8:
  586                         uopt->flags |= (1 << UDF_FLAG_UTF8);
  587                         break;
  588 #ifdef CONFIG_UDF_NLS
  589                 case Opt_iocharset:
  590                         uopt->nls_map = load_nls(args[0].from);
  591                         uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
  592                         break;
  593 #endif
  594                 case Opt_uignore:
  595                         uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
  596                         break;
  597                 case Opt_uforget:
  598                         uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
  599                         break;
  600                 case Opt_gignore:
  601                         uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
  602                         break;
  603                 case Opt_gforget:
  604                         uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
  605                         break;
  606                 case Opt_fmode:
  607                         if (match_octal(args, &option))
  608                                 return 0;
  609                         uopt->fmode = option & 0777;
  610                         break;
  611                 case Opt_dmode:
  612                         if (match_octal(args, &option))
  613                                 return 0;
  614                         uopt->dmode = option & 0777;
  615                         break;
  616                 default:
  617                         pr_err("bad mount option \"%s\" or missing value\n", p);
  618                         return 0;
  619                 }
  620         }
  621         return 1;
  622 }
  623 
  624 static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
  625 {
  626         struct udf_options uopt;
  627         struct udf_sb_info *sbi = UDF_SB(sb);
  628         int error = 0;
  629 
  630         uopt.flags = sbi->s_flags;
  631         uopt.uid   = sbi->s_uid;
  632         uopt.gid   = sbi->s_gid;
  633         uopt.umask = sbi->s_umask;
  634         uopt.fmode = sbi->s_fmode;
  635         uopt.dmode = sbi->s_dmode;
  636 
  637         if (!udf_parse_options(options, &uopt, true))
  638                 return -EINVAL;
  639 
  640         write_lock(&sbi->s_cred_lock);
  641         sbi->s_flags = uopt.flags;
  642         sbi->s_uid   = uopt.uid;
  643         sbi->s_gid   = uopt.gid;
  644         sbi->s_umask = uopt.umask;
  645         sbi->s_fmode = uopt.fmode;
  646         sbi->s_dmode = uopt.dmode;
  647         write_unlock(&sbi->s_cred_lock);
  648 
  649         if (sbi->s_lvid_bh) {
  650                 int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
  651                 if (write_rev > UDF_MAX_WRITE_VERSION)
  652                         *flags |= MS_RDONLY;
  653         }
  654 
  655         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
  656                 goto out_unlock;
  657 
  658         if (*flags & MS_RDONLY)
  659                 udf_close_lvid(sb);
  660         else
  661                 udf_open_lvid(sb);
  662 
  663 out_unlock:
  664         return error;
  665 }
  666 
  667 /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
  668 /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
  669 static loff_t udf_check_vsd(struct super_block *sb)
  670 {
  671         struct volStructDesc *vsd = NULL;
  672         loff_t sector = 32768;
  673         int sectorsize;
  674         struct buffer_head *bh = NULL;
  675         int nsr02 = 0;
  676         int nsr03 = 0;
  677         struct udf_sb_info *sbi;
  678 
  679         sbi = UDF_SB(sb);
  680         if (sb->s_blocksize < sizeof(struct volStructDesc))
  681                 sectorsize = sizeof(struct volStructDesc);
  682         else
  683                 sectorsize = sb->s_blocksize;
  684 
  685         sector += (sbi->s_session << sb->s_blocksize_bits);
  686 
  687         udf_debug("Starting at sector %u (%ld byte sectors)\n",
  688                   (unsigned int)(sector >> sb->s_blocksize_bits),
  689                   sb->s_blocksize);
  690         /* Process the sequence (if applicable) */
  691         for (; !nsr02 && !nsr03; sector += sectorsize) {
  692                 /* Read a block */
  693                 bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
  694                 if (!bh)
  695                         break;
  696 
  697                 /* Look for ISO  descriptors */
  698                 vsd = (struct volStructDesc *)(bh->b_data +
  699                                               (sector & (sb->s_blocksize - 1)));
  700 
  701                 if (vsd->stdIdent[0] == 0) {
  702                         brelse(bh);
  703                         break;
  704                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
  705                                     VSD_STD_ID_LEN)) {
  706                         switch (vsd->structType) {
  707                         case 0:
  708                                 udf_debug("ISO9660 Boot Record found\n");
  709                                 break;
  710                         case 1:
  711                                 udf_debug("ISO9660 Primary Volume Descriptor found\n");
  712                                 break;
  713                         case 2:
  714                                 udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
  715                                 break;
  716                         case 3:
  717                                 udf_debug("ISO9660 Volume Partition Descriptor found\n");
  718                                 break;
  719                         case 255:
  720                                 udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
  721                                 break;
  722                         default:
  723                                 udf_debug("ISO9660 VRS (%u) found\n",
  724                                           vsd->structType);
  725                                 break;
  726                         }
  727                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
  728                                     VSD_STD_ID_LEN))
  729                         ; /* nothing */
  730                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
  731                                     VSD_STD_ID_LEN)) {
  732                         brelse(bh);
  733                         break;
  734                 } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
  735                                     VSD_STD_ID_LEN))
  736                         nsr02 = sector;
  737                 else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
  738                                     VSD_STD_ID_LEN))
  739                         nsr03 = sector;
  740                 brelse(bh);
  741         }
  742 
  743         if (nsr03)
  744                 return nsr03;
  745         else if (nsr02)
  746                 return nsr02;
  747         else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
  748                 return -1;
  749         else
  750                 return 0;
  751 }
  752 
  753 static int udf_find_fileset(struct super_block *sb,
  754                             struct kernel_lb_addr *fileset,
  755                             struct kernel_lb_addr *root)
  756 {
  757         struct buffer_head *bh = NULL;
  758         long lastblock;
  759         uint16_t ident;
  760         struct udf_sb_info *sbi;
  761 
  762         if (fileset->logicalBlockNum != 0xFFFFFFFF ||
  763             fileset->partitionReferenceNum != 0xFFFF) {
  764                 bh = udf_read_ptagged(sb, fileset, 0, &ident);
  765 
  766                 if (!bh) {
  767                         return 1;
  768                 } else if (ident != TAG_IDENT_FSD) {
  769                         brelse(bh);
  770                         return 1;
  771                 }
  772 
  773         }
  774 
  775         sbi = UDF_SB(sb);
  776         if (!bh) {
  777                 /* Search backwards through the partitions */
  778                 struct kernel_lb_addr newfileset;
  779 
  780 /* --> cvg: FIXME - is it reasonable? */
  781                 return 1;
  782 
  783                 for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
  784                      (newfileset.partitionReferenceNum != 0xFFFF &&
  785                       fileset->logicalBlockNum == 0xFFFFFFFF &&
  786                       fileset->partitionReferenceNum == 0xFFFF);
  787                      newfileset.partitionReferenceNum--) {
  788                         lastblock = sbi->s_partmaps
  789                                         [newfileset.partitionReferenceNum]
  790                                                 .s_partition_len;
  791                         newfileset.logicalBlockNum = 0;
  792 
  793                         do {
  794                                 bh = udf_read_ptagged(sb, &newfileset, 0,
  795                                                       &ident);
  796                                 if (!bh) {
  797                                         newfileset.logicalBlockNum++;
  798                                         continue;
  799                                 }
  800 
  801                                 switch (ident) {
  802                                 case TAG_IDENT_SBD:
  803                                 {
  804                                         struct spaceBitmapDesc *sp;
  805                                         sp = (struct spaceBitmapDesc *)
  806                                                                 bh->b_data;
  807                                         newfileset.logicalBlockNum += 1 +
  808                                                 ((le32_to_cpu(sp->numOfBytes) +
  809                                                   sizeof(struct spaceBitmapDesc)
  810                                                   - 1) >> sb->s_blocksize_bits);
  811                                         brelse(bh);
  812                                         break;
  813                                 }
  814                                 case TAG_IDENT_FSD:
  815                                         *fileset = newfileset;
  816                                         break;
  817                                 default:
  818                                         newfileset.logicalBlockNum++;
  819                                         brelse(bh);
  820                                         bh = NULL;
  821                                         break;
  822                                 }
  823                         } while (newfileset.logicalBlockNum < lastblock &&
  824                                  fileset->logicalBlockNum == 0xFFFFFFFF &&
  825                                  fileset->partitionReferenceNum == 0xFFFF);
  826                 }
  827         }
  828 
  829         if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
  830              fileset->partitionReferenceNum != 0xFFFF) && bh) {
  831                 udf_debug("Fileset at block=%d, partition=%d\n",
  832                           fileset->logicalBlockNum,
  833                           fileset->partitionReferenceNum);
  834 
  835                 sbi->s_partition = fileset->partitionReferenceNum;
  836                 udf_load_fileset(sb, bh, root);
  837                 brelse(bh);
  838                 return 0;
  839         }
  840         return 1;
  841 }
  842 
  843 static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
  844 {
  845         struct primaryVolDesc *pvoldesc;
  846         struct ustr *instr, *outstr;
  847         struct buffer_head *bh;
  848         uint16_t ident;
  849         int ret = 1;
  850 
  851         instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
  852         if (!instr)
  853                 return 1;
  854 
  855         outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
  856         if (!outstr)
  857                 goto out1;
  858 
  859         bh = udf_read_tagged(sb, block, block, &ident);
  860         if (!bh)
  861                 goto out2;
  862 
  863         BUG_ON(ident != TAG_IDENT_PVD);
  864 
  865         pvoldesc = (struct primaryVolDesc *)bh->b_data;
  866 
  867         if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
  868                               pvoldesc->recordingDateAndTime)) {
  869 #ifdef UDFFS_DEBUG
  870                 struct timestamp *ts = &pvoldesc->recordingDateAndTime;
  871                 udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
  872                           le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
  873                           ts->minute, le16_to_cpu(ts->typeAndTimezone));
  874 #endif
  875         }
  876 
  877         if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
  878                 if (udf_CS0toUTF8(outstr, instr)) {
  879                         strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
  880                                 outstr->u_len > 31 ? 31 : outstr->u_len);
  881                         udf_debug("volIdent[] = '%s'\n",
  882                                   UDF_SB(sb)->s_volume_ident);
  883                 }
  884 
  885         if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
  886                 if (udf_CS0toUTF8(outstr, instr))
  887                         udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
  888 
  889         brelse(bh);
  890         ret = 0;
  891 out2:
  892         kfree(outstr);
  893 out1:
  894         kfree(instr);
  895         return ret;
  896 }
  897 
  898 struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
  899                                         u32 meta_file_loc, u32 partition_num)
  900 {
  901         struct kernel_lb_addr addr;
  902         struct inode *metadata_fe;
  903 
  904         addr.logicalBlockNum = meta_file_loc;
  905         addr.partitionReferenceNum = partition_num;
  906 
  907         metadata_fe = udf_iget(sb, &addr);
  908 
  909         if (metadata_fe == NULL)
  910                 udf_warn(sb, "metadata inode efe not found\n");
  911         else if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
  912                 udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
  913                 iput(metadata_fe);
  914                 metadata_fe = NULL;
  915         }
  916 
  917         return metadata_fe;
  918 }
  919 
  920 static int udf_load_metadata_files(struct super_block *sb, int partition)
  921 {
  922         struct udf_sb_info *sbi = UDF_SB(sb);
  923         struct udf_part_map *map;
  924         struct udf_meta_data *mdata;
  925         struct kernel_lb_addr addr;
  926 
  927         map = &sbi->s_partmaps[partition];
  928         mdata = &map->s_type_specific.s_metadata;
  929 
  930         /* metadata address */
  931         udf_debug("Metadata file location: block = %d part = %d\n",
  932                   mdata->s_meta_file_loc, map->s_partition_num);
  933 
  934         mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
  935                 mdata->s_meta_file_loc, map->s_partition_num);
  936 
  937         if (mdata->s_metadata_fe == NULL) {
  938                 /* mirror file entry */
  939                 udf_debug("Mirror metadata file location: block = %d part = %d\n",
  940                           mdata->s_mirror_file_loc, map->s_partition_num);
  941 
  942                 mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
  943                         mdata->s_mirror_file_loc, map->s_partition_num);
  944 
  945                 if (mdata->s_mirror_fe == NULL) {
  946                         udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
  947                         goto error_exit;
  948                 }
  949         }
  950 
  951         /*
  952          * bitmap file entry
  953          * Note:
  954          * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
  955         */
  956         if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
  957                 addr.logicalBlockNum = mdata->s_bitmap_file_loc;
  958                 addr.partitionReferenceNum = map->s_partition_num;
  959 
  960                 udf_debug("Bitmap file location: block = %d part = %d\n",
  961                           addr.logicalBlockNum, addr.partitionReferenceNum);
  962 
  963                 mdata->s_bitmap_fe = udf_iget(sb, &addr);
  964 
  965                 if (mdata->s_bitmap_fe == NULL) {
  966                         if (sb->s_flags & MS_RDONLY)
  967                                 udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
  968                         else {
  969                                 udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
  970                                 goto error_exit;
  971                         }
  972                 }
  973         }
  974 
  975         udf_debug("udf_load_metadata_files Ok\n");
  976 
  977         return 0;
  978 
  979 error_exit:
  980         return 1;
  981 }
  982 
  983 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
  984                              struct kernel_lb_addr *root)
  985 {
  986         struct fileSetDesc *fset;
  987 
  988         fset = (struct fileSetDesc *)bh->b_data;
  989 
  990         *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
  991 
  992         UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
  993 
  994         udf_debug("Rootdir at block=%d, partition=%d\n",
  995                   root->logicalBlockNum, root->partitionReferenceNum);
  996 }
  997 
  998 int udf_compute_nr_groups(struct super_block *sb, u32 partition)
  999 {
 1000         struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
 1001         return DIV_ROUND_UP(map->s_partition_len +
 1002                             (sizeof(struct spaceBitmapDesc) << 3),
 1003                             sb->s_blocksize * 8);
 1004 }
 1005 
 1006 static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
 1007 {
 1008         struct udf_bitmap *bitmap;
 1009         int nr_groups;
 1010         int size;
 1011 
 1012         nr_groups = udf_compute_nr_groups(sb, index);
 1013         size = sizeof(struct udf_bitmap) +
 1014                 (sizeof(struct buffer_head *) * nr_groups);
 1015 
 1016         if (size <= PAGE_SIZE)
 1017                 bitmap = kzalloc(size, GFP_KERNEL);
 1018         else
 1019                 bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
 1020 
 1021         if (bitmap == NULL)
 1022                 return NULL;
 1023 
 1024         bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
 1025         bitmap->s_nr_groups = nr_groups;
 1026         return bitmap;
 1027 }
 1028 
 1029 static int udf_fill_partdesc_info(struct super_block *sb,
 1030                 struct partitionDesc *p, int p_index)
 1031 {
 1032         struct udf_part_map *map;
 1033         struct udf_sb_info *sbi = UDF_SB(sb);
 1034         struct partitionHeaderDesc *phd;
 1035 
 1036         map = &sbi->s_partmaps[p_index];
 1037 
 1038         map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
 1039         map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
 1040 
 1041         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
 1042                 map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
 1043         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
 1044                 map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
 1045         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
 1046                 map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
 1047         if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
 1048                 map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
 1049 
 1050         udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
 1051                   p_index, map->s_partition_type,
 1052                   map->s_partition_root, map->s_partition_len);
 1053 
 1054         if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
 1055             strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
 1056                 return 0;
 1057 
 1058         phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
 1059         if (phd->unallocSpaceTable.extLength) {
 1060                 struct kernel_lb_addr loc = {
 1061                         .logicalBlockNum = le32_to_cpu(
 1062                                 phd->unallocSpaceTable.extPosition),
 1063                         .partitionReferenceNum = p_index,
 1064                 };
 1065 
 1066                 map->s_uspace.s_table = udf_iget(sb, &loc);
 1067                 if (!map->s_uspace.s_table) {
 1068                         udf_debug("cannot load unallocSpaceTable (part %d)\n",
 1069                                   p_index);
 1070                         return 1;
 1071                 }
 1072                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
 1073                 udf_debug("unallocSpaceTable (part %d) @ %ld\n",
 1074                           p_index, map->s_uspace.s_table->i_ino);
 1075         }
 1076 
 1077         if (phd->unallocSpaceBitmap.extLength) {
 1078                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
 1079                 if (!bitmap)
 1080                         return 1;
 1081                 map->s_uspace.s_bitmap = bitmap;
 1082                 bitmap->s_extLength = le32_to_cpu(
 1083                                 phd->unallocSpaceBitmap.extLength);
 1084                 bitmap->s_extPosition = le32_to_cpu(
 1085                                 phd->unallocSpaceBitmap.extPosition);
 1086                 map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
 1087                 udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
 1088                           p_index, bitmap->s_extPosition);
 1089         }
 1090 
 1091         if (phd->partitionIntegrityTable.extLength)
 1092                 udf_debug("partitionIntegrityTable (part %d)\n", p_index);
 1093 
 1094         if (phd->freedSpaceTable.extLength) {
 1095                 struct kernel_lb_addr loc = {
 1096                         .logicalBlockNum = le32_to_cpu(
 1097                                 phd->freedSpaceTable.extPosition),
 1098                         .partitionReferenceNum = p_index,
 1099                 };
 1100 
 1101                 map->s_fspace.s_table = udf_iget(sb, &loc);
 1102                 if (!map->s_fspace.s_table) {
 1103                         udf_debug("cannot load freedSpaceTable (part %d)\n",
 1104                                   p_index);
 1105                         return 1;
 1106                 }
 1107 
 1108                 map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
 1109                 udf_debug("freedSpaceTable (part %d) @ %ld\n",
 1110                           p_index, map->s_fspace.s_table->i_ino);
 1111         }
 1112 
 1113         if (phd->freedSpaceBitmap.extLength) {
 1114                 struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
 1115                 if (!bitmap)
 1116                         return 1;
 1117                 map->s_fspace.s_bitmap = bitmap;
 1118                 bitmap->s_extLength = le32_to_cpu(
 1119                                 phd->freedSpaceBitmap.extLength);
 1120                 bitmap->s_extPosition = le32_to_cpu(
 1121                                 phd->freedSpaceBitmap.extPosition);
 1122                 map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
 1123                 udf_debug("freedSpaceBitmap (part %d) @ %d\n",
 1124                           p_index, bitmap->s_extPosition);
 1125         }
 1126         return 0;
 1127 }
 1128 
 1129 static void udf_find_vat_block(struct super_block *sb, int p_index,
 1130                                int type1_index, sector_t start_block)
 1131 {
 1132         struct udf_sb_info *sbi = UDF_SB(sb);
 1133         struct udf_part_map *map = &sbi->s_partmaps[p_index];
 1134         sector_t vat_block;
 1135         struct kernel_lb_addr ino;
 1136 
 1137         /*
 1138          * VAT file entry is in the last recorded block. Some broken disks have
 1139          * it a few blocks before so try a bit harder...
 1140          */
 1141         ino.partitionReferenceNum = type1_index;
 1142         for (vat_block = start_block;
 1143              vat_block >= map->s_partition_root &&
 1144              vat_block >= start_block - 3 &&
 1145              !sbi->s_vat_inode; vat_block--) {
 1146                 ino.logicalBlockNum = vat_block - map->s_partition_root;
 1147                 sbi->s_vat_inode = udf_iget(sb, &ino);
 1148         }
 1149 }
 1150 
 1151 static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
 1152 {
 1153         struct udf_sb_info *sbi = UDF_SB(sb);
 1154         struct udf_part_map *map = &sbi->s_partmaps[p_index];
 1155         struct buffer_head *bh = NULL;
 1156         struct udf_inode_info *vati;
 1157         uint32_t pos;
 1158         struct virtualAllocationTable20 *vat20;
 1159         sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
 1160 
 1161         udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
 1162         if (!sbi->s_vat_inode &&
 1163             sbi->s_last_block != blocks - 1) {
 1164                 pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
 1165                           (unsigned long)sbi->s_last_block,
 1166                           (unsigned long)blocks - 1);
 1167                 udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
 1168         }
 1169         if (!sbi->s_vat_inode)
 1170                 return 1;
 1171 
 1172         if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
 1173                 map->s_type_specific.s_virtual.s_start_offset = 0;
 1174                 map->s_type_specific.s_virtual.s_num_entries =
 1175                         (sbi->s_vat_inode->i_size - 36) >> 2;
 1176         } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
 1177                 vati = UDF_I(sbi->s_vat_inode);
 1178                 if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 1179                         pos = udf_block_map(sbi->s_vat_inode, 0);
 1180                         bh = sb_bread(sb, pos);
 1181                         if (!bh)
 1182                                 return 1;
 1183                         vat20 = (struct virtualAllocationTable20 *)bh->b_data;
 1184                 } else {
 1185                         vat20 = (struct virtualAllocationTable20 *)
 1186                                                         vati->i_ext.i_data;
 1187                 }
 1188 
 1189                 map->s_type_specific.s_virtual.s_start_offset =
 1190                         le16_to_cpu(vat20->lengthHeader);
 1191                 map->s_type_specific.s_virtual.s_num_entries =
 1192                         (sbi->s_vat_inode->i_size -
 1193                                 map->s_type_specific.s_virtual.
 1194                                         s_start_offset) >> 2;
 1195                 brelse(bh);
 1196         }
 1197         return 0;
 1198 }
 1199 
 1200 static int udf_load_partdesc(struct super_block *sb, sector_t block)
 1201 {
 1202         struct buffer_head *bh;
 1203         struct partitionDesc *p;
 1204         struct udf_part_map *map;
 1205         struct udf_sb_info *sbi = UDF_SB(sb);
 1206         int i, type1_idx;
 1207         uint16_t partitionNumber;
 1208         uint16_t ident;
 1209         int ret = 0;
 1210 
 1211         bh = udf_read_tagged(sb, block, block, &ident);
 1212         if (!bh)
 1213                 return 1;
 1214         if (ident != TAG_IDENT_PD)
 1215                 goto out_bh;
 1216 
 1217         p = (struct partitionDesc *)bh->b_data;
 1218         partitionNumber = le16_to_cpu(p->partitionNumber);
 1219 
 1220         /* First scan for TYPE1, SPARABLE and METADATA partitions */
 1221         for (i = 0; i < sbi->s_partitions; i++) {
 1222                 map = &sbi->s_partmaps[i];
 1223                 udf_debug("Searching map: (%d == %d)\n",
 1224                           map->s_partition_num, partitionNumber);
 1225                 if (map->s_partition_num == partitionNumber &&
 1226                     (map->s_partition_type == UDF_TYPE1_MAP15 ||
 1227                      map->s_partition_type == UDF_SPARABLE_MAP15))
 1228                         break;
 1229         }
 1230 
 1231         if (i >= sbi->s_partitions) {
 1232                 udf_debug("Partition (%d) not found in partition map\n",
 1233                           partitionNumber);
 1234                 goto out_bh;
 1235         }
 1236 
 1237         ret = udf_fill_partdesc_info(sb, p, i);
 1238 
 1239         /*
 1240          * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
 1241          * PHYSICAL partitions are already set up
 1242          */
 1243         type1_idx = i;
 1244         for (i = 0; i < sbi->s_partitions; i++) {
 1245                 map = &sbi->s_partmaps[i];
 1246 
 1247                 if (map->s_partition_num == partitionNumber &&
 1248                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
 1249                      map->s_partition_type == UDF_VIRTUAL_MAP20 ||
 1250                      map->s_partition_type == UDF_METADATA_MAP25))
 1251                         break;
 1252         }
 1253 
 1254         if (i >= sbi->s_partitions)
 1255                 goto out_bh;
 1256 
 1257         ret = udf_fill_partdesc_info(sb, p, i);
 1258         if (ret)
 1259                 goto out_bh;
 1260 
 1261         if (map->s_partition_type == UDF_METADATA_MAP25) {
 1262                 ret = udf_load_metadata_files(sb, i);
 1263                 if (ret) {
 1264                         udf_err(sb, "error loading MetaData partition map %d\n",
 1265                                 i);
 1266                         goto out_bh;
 1267                 }
 1268         } else {
 1269                 ret = udf_load_vat(sb, i, type1_idx);
 1270                 if (ret)
 1271                         goto out_bh;
 1272                 /*
 1273                  * Mark filesystem read-only if we have a partition with
 1274                  * virtual map since we don't handle writing to it (we
 1275                  * overwrite blocks instead of relocating them).
 1276                  */
 1277                 sb->s_flags |= MS_RDONLY;
 1278                 pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
 1279         }
 1280 out_bh:
 1281         /* In case loading failed, we handle cleanup in udf_fill_super */
 1282         brelse(bh);
 1283         return ret;
 1284 }
 1285 
 1286 static int udf_load_sparable_map(struct super_block *sb,
 1287                                  struct udf_part_map *map,
 1288                                  struct sparablePartitionMap *spm)
 1289 {
 1290         uint32_t loc;
 1291         uint16_t ident;
 1292         struct sparingTable *st;
 1293         struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
 1294         int i;
 1295         struct buffer_head *bh;
 1296 
 1297         map->s_partition_type = UDF_SPARABLE_MAP15;
 1298         sdata->s_packet_len = le16_to_cpu(spm->packetLength);
 1299         if (!is_power_of_2(sdata->s_packet_len)) {
 1300                 udf_err(sb, "error loading logical volume descriptor: "
 1301                         "Invalid packet length %u\n",
 1302                         (unsigned)sdata->s_packet_len);
 1303                 return -EIO;
 1304         }
 1305         if (spm->numSparingTables > 4) {
 1306                 udf_err(sb, "error loading logical volume descriptor: "
 1307                         "Too many sparing tables (%d)\n",
 1308                         (int)spm->numSparingTables);
 1309                 return -EIO;
 1310         }
 1311 
 1312         for (i = 0; i < spm->numSparingTables; i++) {
 1313                 loc = le32_to_cpu(spm->locSparingTable[i]);
 1314                 bh = udf_read_tagged(sb, loc, loc, &ident);
 1315                 if (!bh)
 1316                         continue;
 1317 
 1318                 st = (struct sparingTable *)bh->b_data;
 1319                 if (ident != 0 ||
 1320                     strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
 1321                             strlen(UDF_ID_SPARING)) ||
 1322                     sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
 1323                                                         sb->s_blocksize) {
 1324                         brelse(bh);
 1325                         continue;
 1326                 }
 1327 
 1328                 sdata->s_spar_map[i] = bh;
 1329         }
 1330         map->s_partition_func = udf_get_pblock_spar15;
 1331         return 0;
 1332 }
 1333 
 1334 static int udf_load_logicalvol(struct super_block *sb, sector_t block,
 1335                                struct kernel_lb_addr *fileset)
 1336 {
 1337         struct logicalVolDesc *lvd;
 1338         int i, offset;
 1339         uint8_t type;
 1340         struct udf_sb_info *sbi = UDF_SB(sb);
 1341         struct genericPartitionMap *gpm;
 1342         uint16_t ident;
 1343         struct buffer_head *bh;
 1344         unsigned int table_len;
 1345         int ret = 0;
 1346 
 1347         bh = udf_read_tagged(sb, block, block, &ident);
 1348         if (!bh)
 1349                 return 1;
 1350         BUG_ON(ident != TAG_IDENT_LVD);
 1351         lvd = (struct logicalVolDesc *)bh->b_data;
 1352         table_len = le32_to_cpu(lvd->mapTableLength);
 1353         if (table_len > sb->s_blocksize - sizeof(*lvd)) {
 1354                 udf_err(sb, "error loading logical volume descriptor: "
 1355                         "Partition table too long (%u > %lu)\n", table_len,
 1356                         sb->s_blocksize - sizeof(*lvd));
 1357                 ret = 1;
 1358                 goto out_bh;
 1359         }
 1360 
 1361         ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
 1362         if (ret)
 1363                 goto out_bh;
 1364 
 1365         for (i = 0, offset = 0;
 1366              i < sbi->s_partitions && offset < table_len;
 1367              i++, offset += gpm->partitionMapLength) {
 1368                 struct udf_part_map *map = &sbi->s_partmaps[i];
 1369                 gpm = (struct genericPartitionMap *)
 1370                                 &(lvd->partitionMaps[offset]);
 1371                 type = gpm->partitionMapType;
 1372                 if (type == 1) {
 1373                         struct genericPartitionMap1 *gpm1 =
 1374                                 (struct genericPartitionMap1 *)gpm;
 1375                         map->s_partition_type = UDF_TYPE1_MAP15;
 1376                         map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
 1377                         map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
 1378                         map->s_partition_func = NULL;
 1379                 } else if (type == 2) {
 1380                         struct udfPartitionMap2 *upm2 =
 1381                                                 (struct udfPartitionMap2 *)gpm;
 1382                         if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
 1383                                                 strlen(UDF_ID_VIRTUAL))) {
 1384                                 u16 suf =
 1385                                         le16_to_cpu(((__le16 *)upm2->partIdent.
 1386                                                         identSuffix)[0]);
 1387                                 if (suf < 0x0200) {
 1388                                         map->s_partition_type =
 1389                                                         UDF_VIRTUAL_MAP15;
 1390                                         map->s_partition_func =
 1391                                                         udf_get_pblock_virt15;
 1392                                 } else {
 1393                                         map->s_partition_type =
 1394                                                         UDF_VIRTUAL_MAP20;
 1395                                         map->s_partition_func =
 1396                                                         udf_get_pblock_virt20;
 1397                                 }
 1398                         } else if (!strncmp(upm2->partIdent.ident,
 1399                                                 UDF_ID_SPARABLE,
 1400                                                 strlen(UDF_ID_SPARABLE))) {
 1401                                 if (udf_load_sparable_map(sb, map,
 1402                                     (struct sparablePartitionMap *)gpm) < 0) {
 1403                                         ret = 1;
 1404                                         goto out_bh;
 1405                                 }
 1406                         } else if (!strncmp(upm2->partIdent.ident,
 1407                                                 UDF_ID_METADATA,
 1408                                                 strlen(UDF_ID_METADATA))) {
 1409                                 struct udf_meta_data *mdata =
 1410                                         &map->s_type_specific.s_metadata;
 1411                                 struct metadataPartitionMap *mdm =
 1412                                                 (struct metadataPartitionMap *)
 1413                                                 &(lvd->partitionMaps[offset]);
 1414                                 udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
 1415                                           i, type, UDF_ID_METADATA);
 1416 
 1417                                 map->s_partition_type = UDF_METADATA_MAP25;
 1418                                 map->s_partition_func = udf_get_pblock_meta25;
 1419 
 1420                                 mdata->s_meta_file_loc   =
 1421                                         le32_to_cpu(mdm->metadataFileLoc);
 1422                                 mdata->s_mirror_file_loc =
 1423                                         le32_to_cpu(mdm->metadataMirrorFileLoc);
 1424                                 mdata->s_bitmap_file_loc =
 1425                                         le32_to_cpu(mdm->metadataBitmapFileLoc);
 1426                                 mdata->s_alloc_unit_size =
 1427                                         le32_to_cpu(mdm->allocUnitSize);
 1428                                 mdata->s_align_unit_size =
 1429                                         le16_to_cpu(mdm->alignUnitSize);
 1430                                 if (mdm->flags & 0x01)
 1431                                         mdata->s_flags |= MF_DUPLICATE_MD;
 1432 
 1433                                 udf_debug("Metadata Ident suffix=0x%x\n",
 1434                                           le16_to_cpu(*(__le16 *)
 1435                                                       mdm->partIdent.identSuffix));
 1436                                 udf_debug("Metadata part num=%d\n",
 1437                                           le16_to_cpu(mdm->partitionNum));
 1438                                 udf_debug("Metadata part alloc unit size=%d\n",
 1439                                           le32_to_cpu(mdm->allocUnitSize));
 1440                                 udf_debug("Metadata file loc=%d\n",
 1441                                           le32_to_cpu(mdm->metadataFileLoc));
 1442                                 udf_debug("Mirror file loc=%d\n",
 1443                                           le32_to_cpu(mdm->metadataMirrorFileLoc));
 1444                                 udf_debug("Bitmap file loc=%d\n",
 1445                                           le32_to_cpu(mdm->metadataBitmapFileLoc));
 1446                                 udf_debug("Flags: %d %d\n",
 1447                                           mdata->s_flags, mdm->flags);
 1448                         } else {
 1449                                 udf_debug("Unknown ident: %s\n",
 1450                                           upm2->partIdent.ident);
 1451                                 continue;
 1452                         }
 1453                         map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
 1454                         map->s_partition_num = le16_to_cpu(upm2->partitionNum);
 1455                 }
 1456                 udf_debug("Partition (%d:%d) type %d on volume %d\n",
 1457                           i, map->s_partition_num, type, map->s_volumeseqnum);
 1458         }
 1459 
 1460         if (fileset) {
 1461                 struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
 1462 
 1463                 *fileset = lelb_to_cpu(la->extLocation);
 1464                 udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
 1465                           fileset->logicalBlockNum,
 1466                           fileset->partitionReferenceNum);
 1467         }
 1468         if (lvd->integritySeqExt.extLength)
 1469                 udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
 1470 
 1471 out_bh:
 1472         brelse(bh);
 1473         return ret;
 1474 }
 1475 
 1476 /*
 1477  * udf_load_logicalvolint
 1478  *
 1479  */
 1480 static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
 1481 {
 1482         struct buffer_head *bh = NULL;
 1483         uint16_t ident;
 1484         struct udf_sb_info *sbi = UDF_SB(sb);
 1485         struct logicalVolIntegrityDesc *lvid;
 1486 
 1487         while (loc.extLength > 0 &&
 1488                (bh = udf_read_tagged(sb, loc.extLocation,
 1489                                      loc.extLocation, &ident)) &&
 1490                ident == TAG_IDENT_LVID) {
 1491                 sbi->s_lvid_bh = bh;
 1492                 lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
 1493 
 1494                 if (lvid->nextIntegrityExt.extLength)
 1495                         udf_load_logicalvolint(sb,
 1496                                 leea_to_cpu(lvid->nextIntegrityExt));
 1497 
 1498                 if (sbi->s_lvid_bh != bh)
 1499                         brelse(bh);
 1500                 loc.extLength -= sb->s_blocksize;
 1501                 loc.extLocation++;
 1502         }
 1503         if (sbi->s_lvid_bh != bh)
 1504                 brelse(bh);
 1505 }
 1506 
 1507 /*
 1508  * udf_process_sequence
 1509  *
 1510  * PURPOSE
 1511  *      Process a main/reserve volume descriptor sequence.
 1512  *
 1513  * PRE-CONDITIONS
 1514  *      sb                      Pointer to _locked_ superblock.
 1515  *      block                   First block of first extent of the sequence.
 1516  *      lastblock               Lastblock of first extent of the sequence.
 1517  *
 1518  * HISTORY
 1519  *      July 1, 1997 - Andrew E. Mileski
 1520  *      Written, tested, and released.
 1521  */
 1522 static noinline int udf_process_sequence(struct super_block *sb, long block,
 1523                                 long lastblock, struct kernel_lb_addr *fileset)
 1524 {
 1525         struct buffer_head *bh = NULL;
 1526         struct udf_vds_record vds[VDS_POS_LENGTH];
 1527         struct udf_vds_record *curr;
 1528         struct generic_desc *gd;
 1529         struct volDescPtr *vdp;
 1530         int done = 0;
 1531         uint32_t vdsn;
 1532         uint16_t ident;
 1533         long next_s = 0, next_e = 0;
 1534 
 1535         memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
 1536 
 1537         /*
 1538          * Read the main descriptor sequence and find which descriptors
 1539          * are in it.
 1540          */
 1541         for (; (!done && block <= lastblock); block++) {
 1542 
 1543                 bh = udf_read_tagged(sb, block, block, &ident);
 1544                 if (!bh) {
 1545                         udf_err(sb,
 1546                                 "Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
 1547                                 (unsigned long long)block);
 1548                         return 1;
 1549                 }
 1550 
 1551                 /* Process each descriptor (ISO 13346 3/8.3-8.4) */
 1552                 gd = (struct generic_desc *)bh->b_data;
 1553                 vdsn = le32_to_cpu(gd->volDescSeqNum);
 1554                 switch (ident) {
 1555                 case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
 1556                         curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
 1557                         if (vdsn >= curr->volDescSeqNum) {
 1558                                 curr->volDescSeqNum = vdsn;
 1559                                 curr->block = block;
 1560                         }
 1561                         break;
 1562                 case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
 1563                         curr = &vds[VDS_POS_VOL_DESC_PTR];
 1564                         if (vdsn >= curr->volDescSeqNum) {
 1565                                 curr->volDescSeqNum = vdsn;
 1566                                 curr->block = block;
 1567 
 1568                                 vdp = (struct volDescPtr *)bh->b_data;
 1569                                 next_s = le32_to_cpu(
 1570                                         vdp->nextVolDescSeqExt.extLocation);
 1571                                 next_e = le32_to_cpu(
 1572                                         vdp->nextVolDescSeqExt.extLength);
 1573                                 next_e = next_e >> sb->s_blocksize_bits;
 1574                                 next_e += next_s;
 1575                         }
 1576                         break;
 1577                 case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
 1578                         curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
 1579                         if (vdsn >= curr->volDescSeqNum) {
 1580                                 curr->volDescSeqNum = vdsn;
 1581                                 curr->block = block;
 1582                         }
 1583                         break;
 1584                 case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
 1585                         curr = &vds[VDS_POS_PARTITION_DESC];
 1586                         if (!curr->block)
 1587                                 curr->block = block;
 1588                         break;
 1589                 case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
 1590                         curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
 1591                         if (vdsn >= curr->volDescSeqNum) {
 1592                                 curr->volDescSeqNum = vdsn;
 1593                                 curr->block = block;
 1594                         }
 1595                         break;
 1596                 case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
 1597                         curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
 1598                         if (vdsn >= curr->volDescSeqNum) {
 1599                                 curr->volDescSeqNum = vdsn;
 1600                                 curr->block = block;
 1601                         }
 1602                         break;
 1603                 case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
 1604                         vds[VDS_POS_TERMINATING_DESC].block = block;
 1605                         if (next_e) {
 1606                                 block = next_s;
 1607                                 lastblock = next_e;
 1608                                 next_s = next_e = 0;
 1609                         } else
 1610                                 done = 1;
 1611                         break;
 1612                 }
 1613                 brelse(bh);
 1614         }
 1615         /*
 1616          * Now read interesting descriptors again and process them
 1617          * in a suitable order
 1618          */
 1619         if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
 1620                 udf_err(sb, "Primary Volume Descriptor not found!\n");
 1621                 return 1;
 1622         }
 1623         if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
 1624                 return 1;
 1625 
 1626         if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
 1627             vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
 1628                 return 1;
 1629 
 1630         if (vds[VDS_POS_PARTITION_DESC].block) {
 1631                 /*
 1632                  * We rescan the whole descriptor sequence to find
 1633                  * partition descriptor blocks and process them.
 1634                  */
 1635                 for (block = vds[VDS_POS_PARTITION_DESC].block;
 1636                      block < vds[VDS_POS_TERMINATING_DESC].block;
 1637                      block++)
 1638                         if (udf_load_partdesc(sb, block))
 1639                                 return 1;
 1640         }
 1641 
 1642         return 0;
 1643 }
 1644 
 1645 static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
 1646                              struct kernel_lb_addr *fileset)
 1647 {
 1648         struct anchorVolDescPtr *anchor;
 1649         long main_s, main_e, reserve_s, reserve_e;
 1650 
 1651         anchor = (struct anchorVolDescPtr *)bh->b_data;
 1652 
 1653         /* Locate the main sequence */
 1654         main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
 1655         main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
 1656         main_e = main_e >> sb->s_blocksize_bits;
 1657         main_e += main_s;
 1658 
 1659         /* Locate the reserve sequence */
 1660         reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
 1661         reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
 1662         reserve_e = reserve_e >> sb->s_blocksize_bits;
 1663         reserve_e += reserve_s;
 1664 
 1665         /* Process the main & reserve sequences */
 1666         /* responsible for finding the PartitionDesc(s) */
 1667         if (!udf_process_sequence(sb, main_s, main_e, fileset))
 1668                 return 1;
 1669         udf_sb_free_partitions(sb);
 1670         if (!udf_process_sequence(sb, reserve_s, reserve_e, fileset))
 1671                 return 1;
 1672         udf_sb_free_partitions(sb);
 1673         return 0;
 1674 }
 1675 
 1676 /*
 1677  * Check whether there is an anchor block in the given block and
 1678  * load Volume Descriptor Sequence if so.
 1679  */
 1680 static int udf_check_anchor_block(struct super_block *sb, sector_t block,
 1681                                   struct kernel_lb_addr *fileset)
 1682 {
 1683         struct buffer_head *bh;
 1684         uint16_t ident;
 1685         int ret;
 1686 
 1687         if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
 1688             udf_fixed_to_variable(block) >=
 1689             sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
 1690                 return 0;
 1691 
 1692         bh = udf_read_tagged(sb, block, block, &ident);
 1693         if (!bh)
 1694                 return 0;
 1695         if (ident != TAG_IDENT_AVDP) {
 1696                 brelse(bh);
 1697                 return 0;
 1698         }
 1699         ret = udf_load_sequence(sb, bh, fileset);
 1700         brelse(bh);
 1701         return ret;
 1702 }
 1703 
 1704 /* Search for an anchor volume descriptor pointer */
 1705 static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
 1706                                  struct kernel_lb_addr *fileset)
 1707 {
 1708         sector_t last[6];
 1709         int i;
 1710         struct udf_sb_info *sbi = UDF_SB(sb);
 1711         int last_count = 0;
 1712 
 1713         /* First try user provided anchor */
 1714         if (sbi->s_anchor) {
 1715                 if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
 1716                         return lastblock;
 1717         }
 1718         /*
 1719          * according to spec, anchor is in either:
 1720          *     block 256
 1721          *     lastblock-256
 1722          *     lastblock
 1723          *  however, if the disc isn't closed, it could be 512.
 1724          */
 1725         if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
 1726                 return lastblock;
 1727         /*
 1728          * The trouble is which block is the last one. Drives often misreport
 1729          * this so we try various possibilities.
 1730          */
 1731         last[last_count++] = lastblock;
 1732         if (lastblock >= 1)
 1733                 last[last_count++] = lastblock - 1;
 1734         last[last_count++] = lastblock + 1;
 1735         if (lastblock >= 2)
 1736                 last[last_count++] = lastblock - 2;
 1737         if (lastblock >= 150)
 1738                 last[last_count++] = lastblock - 150;
 1739         if (lastblock >= 152)
 1740                 last[last_count++] = lastblock - 152;
 1741 
 1742         for (i = 0; i < last_count; i++) {
 1743                 if (last[i] >= sb->s_bdev->bd_inode->i_size >>
 1744                                 sb->s_blocksize_bits)
 1745                         continue;
 1746                 if (udf_check_anchor_block(sb, last[i], fileset))
 1747                         return last[i];
 1748                 if (last[i] < 256)
 1749                         continue;
 1750                 if (udf_check_anchor_block(sb, last[i] - 256, fileset))
 1751                         return last[i];
 1752         }
 1753 
 1754         /* Finally try block 512 in case media is open */
 1755         if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
 1756                 return last[0];
 1757         return 0;
 1758 }
 1759 
 1760 /*
 1761  * Find an anchor volume descriptor and load Volume Descriptor Sequence from
 1762  * area specified by it. The function expects sbi->s_lastblock to be the last
 1763  * block on the media.
 1764  *
 1765  * Return 1 if ok, 0 if not found.
 1766  *
 1767  */
 1768 static int udf_find_anchor(struct super_block *sb,
 1769                            struct kernel_lb_addr *fileset)
 1770 {
 1771         sector_t lastblock;
 1772         struct udf_sb_info *sbi = UDF_SB(sb);
 1773 
 1774         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
 1775         if (lastblock)
 1776                 goto out;
 1777 
 1778         /* No anchor found? Try VARCONV conversion of block numbers */
 1779         UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
 1780         /* Firstly, we try to not convert number of the last block */
 1781         lastblock = udf_scan_anchors(sb,
 1782                                 udf_variable_to_fixed(sbi->s_last_block),
 1783                                 fileset);
 1784         if (lastblock)
 1785                 goto out;
 1786 
 1787         /* Secondly, we try with converted number of the last block */
 1788         lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
 1789         if (!lastblock) {
 1790                 /* VARCONV didn't help. Clear it. */
 1791                 UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
 1792                 return 0;
 1793         }
 1794 out:
 1795         sbi->s_last_block = lastblock;
 1796         return 1;
 1797 }
 1798 
 1799 /*
 1800  * Check Volume Structure Descriptor, find Anchor block and load Volume
 1801  * Descriptor Sequence
 1802  */
 1803 static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
 1804                         int silent, struct kernel_lb_addr *fileset)
 1805 {
 1806         struct udf_sb_info *sbi = UDF_SB(sb);
 1807         loff_t nsr_off;
 1808 
 1809         if (!sb_set_blocksize(sb, uopt->blocksize)) {
 1810                 if (!silent)
 1811                         udf_warn(sb, "Bad block size\n");
 1812                 return 0;
 1813         }
 1814         sbi->s_last_block = uopt->lastblock;
 1815         if (!uopt->novrs) {
 1816                 /* Check that it is NSR02 compliant */
 1817                 nsr_off = udf_check_vsd(sb);
 1818                 if (!nsr_off) {
 1819                         if (!silent)
 1820                                 udf_warn(sb, "No VRS found\n");
 1821                         return 0;
 1822                 }
 1823                 if (nsr_off == -1)
 1824                         udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
 1825                 if (!sbi->s_last_block)
 1826                         sbi->s_last_block = udf_get_last_block(sb);
 1827         } else {
 1828                 udf_debug("Validity check skipped because of novrs option\n");
 1829         }
 1830 
 1831         /* Look for anchor block and load Volume Descriptor Sequence */
 1832         sbi->s_anchor = uopt->anchor;
 1833         if (!udf_find_anchor(sb, fileset)) {
 1834                 if (!silent)
 1835                         udf_warn(sb, "No anchor found\n");
 1836                 return 0;
 1837         }
 1838         return 1;
 1839 }
 1840 
 1841 static void udf_open_lvid(struct super_block *sb)
 1842 {
 1843         struct udf_sb_info *sbi = UDF_SB(sb);
 1844         struct buffer_head *bh = sbi->s_lvid_bh;
 1845         struct logicalVolIntegrityDesc *lvid;
 1846         struct logicalVolIntegrityDescImpUse *lvidiu;
 1847 
 1848         if (!bh)
 1849                 return;
 1850 
 1851         mutex_lock(&sbi->s_alloc_mutex);
 1852         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
 1853         lvidiu = udf_sb_lvidiu(sbi);
 1854 
 1855         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
 1856         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
 1857         udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
 1858                                 CURRENT_TIME);
 1859         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
 1860 
 1861         lvid->descTag.descCRC = cpu_to_le16(
 1862                 crc_itu_t(0, (char *)lvid + sizeof(struct tag),
 1863                         le16_to_cpu(lvid->descTag.descCRCLength)));
 1864 
 1865         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
 1866         mark_buffer_dirty(bh);
 1867         sbi->s_lvid_dirty = 0;
 1868         mutex_unlock(&sbi->s_alloc_mutex);
 1869 }
 1870 
 1871 static void udf_close_lvid(struct super_block *sb)
 1872 {
 1873         struct udf_sb_info *sbi = UDF_SB(sb);
 1874         struct buffer_head *bh = sbi->s_lvid_bh;
 1875         struct logicalVolIntegrityDesc *lvid;
 1876         struct logicalVolIntegrityDescImpUse *lvidiu;
 1877 
 1878         if (!bh)
 1879                 return;
 1880 
 1881         mutex_lock(&sbi->s_alloc_mutex);
 1882         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
 1883         lvidiu = udf_sb_lvidiu(sbi);
 1884         lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
 1885         lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
 1886         udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
 1887         if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
 1888                 lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
 1889         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
 1890                 lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
 1891         if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
 1892                 lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
 1893         lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
 1894 
 1895         lvid->descTag.descCRC = cpu_to_le16(
 1896                         crc_itu_t(0, (char *)lvid + sizeof(struct tag),
 1897                                 le16_to_cpu(lvid->descTag.descCRCLength)));
 1898 
 1899         lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
 1900         /*
 1901          * We set buffer uptodate unconditionally here to avoid spurious
 1902          * warnings from mark_buffer_dirty() when previous EIO has marked
 1903          * the buffer as !uptodate
 1904          */
 1905         set_buffer_uptodate(bh);
 1906         mark_buffer_dirty(bh);
 1907         sbi->s_lvid_dirty = 0;
 1908         mutex_unlock(&sbi->s_alloc_mutex);
 1909 }
 1910 
 1911 u64 lvid_get_unique_id(struct super_block *sb)
 1912 {
 1913         struct buffer_head *bh;
 1914         struct udf_sb_info *sbi = UDF_SB(sb);
 1915         struct logicalVolIntegrityDesc *lvid;
 1916         struct logicalVolHeaderDesc *lvhd;
 1917         u64 uniqueID;
 1918         u64 ret;
 1919 
 1920         bh = sbi->s_lvid_bh;
 1921         if (!bh)
 1922                 return 0;
 1923 
 1924         lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
 1925         lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
 1926 
 1927         mutex_lock(&sbi->s_alloc_mutex);
 1928         ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
 1929         if (!(++uniqueID & 0xFFFFFFFF))
 1930                 uniqueID += 16;
 1931         lvhd->uniqueID = cpu_to_le64(uniqueID);
 1932         mutex_unlock(&sbi->s_alloc_mutex);
 1933         mark_buffer_dirty(bh);
 1934 
 1935         return ret;
 1936 }
 1937 
 1938 static int udf_fill_super(struct super_block *sb, void *options, int silent)
 1939 {
 1940         int ret;
 1941         struct inode *inode = NULL;
 1942         struct udf_options uopt;
 1943         struct kernel_lb_addr rootdir, fileset;
 1944         struct udf_sb_info *sbi;
 1945 
 1946         uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
 1947         uopt.uid = INVALID_UID;
 1948         uopt.gid = INVALID_GID;
 1949         uopt.umask = 0;
 1950         uopt.fmode = UDF_INVALID_MODE;
 1951         uopt.dmode = UDF_INVALID_MODE;
 1952 
 1953         sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
 1954         if (!sbi)
 1955                 return -ENOMEM;
 1956 
 1957         sb->s_fs_info = sbi;
 1958 
 1959         mutex_init(&sbi->s_alloc_mutex);
 1960 
 1961         if (!udf_parse_options((char *)options, &uopt, false))
 1962                 goto error_out;
 1963 
 1964         if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
 1965             uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
 1966                 udf_err(sb, "utf8 cannot be combined with iocharset\n");
 1967                 goto error_out;
 1968         }
 1969 #ifdef CONFIG_UDF_NLS
 1970         if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
 1971                 uopt.nls_map = load_nls_default();
 1972                 if (!uopt.nls_map)
 1973                         uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
 1974                 else
 1975                         udf_debug("Using default NLS map\n");
 1976         }
 1977 #endif
 1978         if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
 1979                 uopt.flags |= (1 << UDF_FLAG_UTF8);
 1980 
 1981         fileset.logicalBlockNum = 0xFFFFFFFF;
 1982         fileset.partitionReferenceNum = 0xFFFF;
 1983 
 1984         sbi->s_flags = uopt.flags;
 1985         sbi->s_uid = uopt.uid;
 1986         sbi->s_gid = uopt.gid;
 1987         sbi->s_umask = uopt.umask;
 1988         sbi->s_fmode = uopt.fmode;
 1989         sbi->s_dmode = uopt.dmode;
 1990         sbi->s_nls_map = uopt.nls_map;
 1991         rwlock_init(&sbi->s_cred_lock);
 1992 
 1993         if (uopt.session == 0xFFFFFFFF)
 1994                 sbi->s_session = udf_get_last_session(sb);
 1995         else
 1996                 sbi->s_session = uopt.session;
 1997 
 1998         udf_debug("Multi-session=%d\n", sbi->s_session);
 1999 
 2000         /* Fill in the rest of the superblock */
 2001         sb->s_op = &udf_sb_ops;
 2002         sb->s_export_op = &udf_export_ops;
 2003 
 2004         sb->s_magic = UDF_SUPER_MAGIC;
 2005         sb->s_time_gran = 1000;
 2006 
 2007         if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
 2008                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
 2009         } else {
 2010                 uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
 2011                 ret = udf_load_vrs(sb, &uopt, silent, &fileset);
 2012                 if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
 2013                         if (!silent)
 2014                                 pr_notice("Rescanning with blocksize %d\n",
 2015                                           UDF_DEFAULT_BLOCKSIZE);
 2016                         brelse(sbi->s_lvid_bh);
 2017                         sbi->s_lvid_bh = NULL;
 2018                         uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
 2019                         ret = udf_load_vrs(sb, &uopt, silent, &fileset);
 2020                 }
 2021         }
 2022         if (!ret) {
 2023                 udf_warn(sb, "No partition found (1)\n");
 2024                 goto error_out;
 2025         }
 2026 
 2027         udf_debug("Lastblock=%d\n", sbi->s_last_block);
 2028 
 2029         if (sbi->s_lvid_bh) {
 2030                 struct logicalVolIntegrityDescImpUse *lvidiu =
 2031                                                         udf_sb_lvidiu(sbi);
 2032                 uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
 2033                 uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
 2034                 /* uint16_t maxUDFWriteRev =
 2035                                 le16_to_cpu(lvidiu->maxUDFWriteRev); */
 2036 
 2037                 if (minUDFReadRev > UDF_MAX_READ_VERSION) {
 2038                         udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
 2039                                 le16_to_cpu(lvidiu->minUDFReadRev),
 2040                                 UDF_MAX_READ_VERSION);
 2041                         goto error_out;
 2042                 } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
 2043                         sb->s_flags |= MS_RDONLY;
 2044 
 2045                 sbi->s_udfrev = minUDFWriteRev;
 2046 
 2047                 if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
 2048                         UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
 2049                 if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
 2050                         UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
 2051         }
 2052 
 2053         if (!sbi->s_partitions) {
 2054                 udf_warn(sb, "No partition found (2)\n");
 2055                 goto error_out;
 2056         }
 2057 
 2058         if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
 2059                         UDF_PART_FLAG_READ_ONLY) {
 2060                 pr_notice("Partition marked readonly; forcing readonly mount\n");
 2061                 sb->s_flags |= MS_RDONLY;
 2062         }
 2063 
 2064         if (udf_find_fileset(sb, &fileset, &rootdir)) {
 2065                 udf_warn(sb, "No fileset found\n");
 2066                 goto error_out;
 2067         }
 2068 
 2069         if (!silent) {
 2070                 struct timestamp ts;
 2071                 udf_time_to_disk_stamp(&ts, sbi->s_record_time);
 2072                 udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
 2073                          sbi->s_volume_ident,
 2074                          le16_to_cpu(ts.year), ts.month, ts.day,
 2075                          ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
 2076         }
 2077         if (!(sb->s_flags & MS_RDONLY))
 2078                 udf_open_lvid(sb);
 2079 
 2080         /* Assign the root inode */
 2081         /* assign inodes by physical block number */
 2082         /* perhaps it's not extensible enough, but for now ... */
 2083         inode = udf_iget(sb, &rootdir);
 2084         if (!inode) {
 2085                 udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
 2086                        rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
 2087                 goto error_out;
 2088         }
 2089 
 2090         /* Allocate a dentry for the root inode */
 2091         sb->s_root = d_make_root(inode);
 2092         if (!sb->s_root) {
 2093                 udf_err(sb, "Couldn't allocate root dentry\n");
 2094                 goto error_out;
 2095         }
 2096         sb->s_maxbytes = MAX_LFS_FILESIZE;
 2097         sb->s_max_links = UDF_MAX_LINKS;
 2098         return 0;
 2099 
 2100 error_out:
 2101         if (sbi->s_vat_inode)
 2102                 iput(sbi->s_vat_inode);
 2103 #ifdef CONFIG_UDF_NLS
 2104         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
 2105                 unload_nls(sbi->s_nls_map);
 2106 #endif
 2107         if (!(sb->s_flags & MS_RDONLY))
 2108                 udf_close_lvid(sb);
 2109         brelse(sbi->s_lvid_bh);
 2110         udf_sb_free_partitions(sb);
 2111         kfree(sbi);
 2112         sb->s_fs_info = NULL;
 2113 
 2114         return -EINVAL;
 2115 }
 2116 
 2117 void _udf_err(struct super_block *sb, const char *function,
 2118               const char *fmt, ...)
 2119 {
 2120         struct va_format vaf;
 2121         va_list args;
 2122 
 2123         va_start(args, fmt);
 2124 
 2125         vaf.fmt = fmt;
 2126         vaf.va = &args;
 2127 
 2128         pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
 2129 
 2130         va_end(args);
 2131 }
 2132 
 2133 void _udf_warn(struct super_block *sb, const char *function,
 2134                const char *fmt, ...)
 2135 {
 2136         struct va_format vaf;
 2137         va_list args;
 2138 
 2139         va_start(args, fmt);
 2140 
 2141         vaf.fmt = fmt;
 2142         vaf.va = &args;
 2143 
 2144         pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
 2145 
 2146         va_end(args);
 2147 }
 2148 
 2149 static void udf_put_super(struct super_block *sb)
 2150 {
 2151         struct udf_sb_info *sbi;
 2152 
 2153         sbi = UDF_SB(sb);
 2154 
 2155         if (sbi->s_vat_inode)
 2156                 iput(sbi->s_vat_inode);
 2157 #ifdef CONFIG_UDF_NLS
 2158         if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
 2159                 unload_nls(sbi->s_nls_map);
 2160 #endif
 2161         if (!(sb->s_flags & MS_RDONLY))
 2162                 udf_close_lvid(sb);
 2163         brelse(sbi->s_lvid_bh);
 2164         udf_sb_free_partitions(sb);
 2165         kfree(sb->s_fs_info);
 2166         sb->s_fs_info = NULL;
 2167 }
 2168 
 2169 static int udf_sync_fs(struct super_block *sb, int wait)
 2170 {
 2171         struct udf_sb_info *sbi = UDF_SB(sb);
 2172 
 2173         mutex_lock(&sbi->s_alloc_mutex);
 2174         if (sbi->s_lvid_dirty) {
 2175                 /*
 2176                  * Blockdevice will be synced later so we don't have to submit
 2177                  * the buffer for IO
 2178                  */
 2179                 mark_buffer_dirty(sbi->s_lvid_bh);
 2180                 sbi->s_lvid_dirty = 0;
 2181         }
 2182         mutex_unlock(&sbi->s_alloc_mutex);
 2183 
 2184         return 0;
 2185 }
 2186 
 2187 static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
 2188 {
 2189         struct super_block *sb = dentry->d_sb;
 2190         struct udf_sb_info *sbi = UDF_SB(sb);
 2191         struct logicalVolIntegrityDescImpUse *lvidiu;
 2192         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 2193 
 2194         if (sbi->s_lvid_bh != NULL)
 2195                 lvidiu = udf_sb_lvidiu(sbi);
 2196         else
 2197                 lvidiu = NULL;
 2198 
 2199         buf->f_type = UDF_SUPER_MAGIC;
 2200         buf->f_bsize = sb->s_blocksize;
 2201         buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
 2202         buf->f_bfree = udf_count_free(sb);
 2203         buf->f_bavail = buf->f_bfree;
 2204         buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
 2205                                           le32_to_cpu(lvidiu->numDirs)) : 0)
 2206                         + buf->f_bfree;
 2207         buf->f_ffree = buf->f_bfree;
 2208         buf->f_namelen = UDF_NAME_LEN - 2;
 2209         buf->f_fsid.val[0] = (u32)id;
 2210         buf->f_fsid.val[1] = (u32)(id >> 32);
 2211 
 2212         return 0;
 2213 }
 2214 
 2215 static unsigned int udf_count_free_bitmap(struct super_block *sb,
 2216                                           struct udf_bitmap *bitmap)
 2217 {
 2218         struct buffer_head *bh = NULL;
 2219         unsigned int accum = 0;
 2220         int index;
 2221         int block = 0, newblock;
 2222         struct kernel_lb_addr loc;
 2223         uint32_t bytes;
 2224         uint8_t *ptr;
 2225         uint16_t ident;
 2226         struct spaceBitmapDesc *bm;
 2227 
 2228         loc.logicalBlockNum = bitmap->s_extPosition;
 2229         loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
 2230         bh = udf_read_ptagged(sb, &loc, 0, &ident);
 2231 
 2232         if (!bh) {
 2233                 udf_err(sb, "udf_count_free failed\n");
 2234                 goto out;
 2235         } else if (ident != TAG_IDENT_SBD) {
 2236                 brelse(bh);
 2237                 udf_err(sb, "udf_count_free failed\n");
 2238                 goto out;
 2239         }
 2240 
 2241         bm = (struct spaceBitmapDesc *)bh->b_data;
 2242         bytes = le32_to_cpu(bm->numOfBytes);
 2243         index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
 2244         ptr = (uint8_t *)bh->b_data;
 2245 
 2246         while (bytes > 0) {
 2247                 u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
 2248                 accum += bitmap_weight((const unsigned long *)(ptr + index),
 2249                                         cur_bytes * 8);
 2250                 bytes -= cur_bytes;
 2251                 if (bytes) {
 2252                         brelse(bh);
 2253                         newblock = udf_get_lb_pblock(sb, &loc, ++block);
 2254                         bh = udf_tread(sb, newblock);
 2255                         if (!bh) {
 2256                                 udf_debug("read failed\n");
 2257                                 goto out;
 2258                         }
 2259                         index = 0;
 2260                         ptr = (uint8_t *)bh->b_data;
 2261                 }
 2262         }
 2263         brelse(bh);
 2264 out:
 2265         return accum;
 2266 }
 2267 
 2268 static unsigned int udf_count_free_table(struct super_block *sb,
 2269                                          struct inode *table)
 2270 {
 2271         unsigned int accum = 0;
 2272         uint32_t elen;
 2273         struct kernel_lb_addr eloc;
 2274         int8_t etype;
 2275         struct extent_position epos;
 2276 
 2277         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
 2278         epos.block = UDF_I(table)->i_location;
 2279         epos.offset = sizeof(struct unallocSpaceEntry);
 2280         epos.bh = NULL;
 2281 
 2282         while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
 2283                 accum += (elen >> table->i_sb->s_blocksize_bits);
 2284 
 2285         brelse(epos.bh);
 2286         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
 2287 
 2288         return accum;
 2289 }
 2290 
 2291 static unsigned int udf_count_free(struct super_block *sb)
 2292 {
 2293         unsigned int accum = 0;
 2294         struct udf_sb_info *sbi;
 2295         struct udf_part_map *map;
 2296 
 2297         sbi = UDF_SB(sb);
 2298         if (sbi->s_lvid_bh) {
 2299                 struct logicalVolIntegrityDesc *lvid =
 2300                         (struct logicalVolIntegrityDesc *)
 2301                         sbi->s_lvid_bh->b_data;
 2302                 if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
 2303                         accum = le32_to_cpu(
 2304                                         lvid->freeSpaceTable[sbi->s_partition]);
 2305                         if (accum == 0xFFFFFFFF)
 2306                                 accum = 0;
 2307                 }
 2308         }
 2309 
 2310         if (accum)
 2311                 return accum;
 2312 
 2313         map = &sbi->s_partmaps[sbi->s_partition];
 2314         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
 2315                 accum += udf_count_free_bitmap(sb,
 2316                                                map->s_uspace.s_bitmap);
 2317         }
 2318         if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
 2319                 accum += udf_count_free_bitmap(sb,
 2320                                                map->s_fspace.s_bitmap);
 2321         }
 2322         if (accum)
 2323                 return accum;
 2324 
 2325         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
 2326                 accum += udf_count_free_table(sb,
 2327                                               map->s_uspace.s_table);
 2328         }
 2329         if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
 2330                 accum += udf_count_free_table(sb,
 2331                                               map->s_fspace.s_table);
 2332         }
 2333 
 2334         return accum;
 2335 }

Cache object: e21b6cc80b1f795d7199927710735914


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.