include/linux/msdos_fs_sb.h

   1 #ifndef _MSDOS_FS_SB
   2 #define _MSDOS_FS_SB
   3
   4 /*
   5  * MS-DOS file system in-core superblock data
   6  */
   7
   8 struct fat_mount_options {
   9         uid_t fs_uid;
  10         gid_t fs_gid;
  11         unsigned short fs_fmask;
  12         unsigned short fs_dmask;
  13         unsigned short codepage;  /* Codepage for shortname conversions */
  14         char *iocharset;          /* Charset used for filename input/display */
  15         unsigned short shortname; /* flags for shortname display/create rule */
  16         unsigned char name_check; /* r = relaxed, n = normal, s = strict */
  17         unsigned quiet:1,         /* set = fake successful chmods and chowns */
  18                  showexec:1,      /* set = only set x bit for com/exe/bat */
  19                  sys_immutable:1, /* set = system files are immutable */
  20                  dotsOK:1,        /* set = hidden and system files are named '.filename' */
  21                  isvfat:1,        /* 0=no vfat long filename support, 1=vfat support */
  22                  utf8:1,          /* Use of UTF8 character set (Default) */
  23                  unicode_xlate:1, /* create escape sequences for unhandled Unicode */
  24                  numtail:1,       /* Does first alias have a numeric '~1' type tail? */
  25                  atari:1,         /* Use Atari GEMDOS variation of MS-DOS fs */
  26                  nocase:1;        /* Does this need case conversion? 0=need case conversion*/
  27 };
  28
  29 #define FAT_CACHE_NR    8 /* number of FAT cache */
  30
  31 struct fat_cache {
  32         int start_cluster; /* first cluster of the chain. */
  33         int file_cluster; /* cluster number in the file. */
  34         int disk_cluster; /* cluster number on disk. */
  35         struct fat_cache *next; /* next cache entry */
  36 };
  37
  38 struct msdos_sb_info {
  39         unsigned short cluster_size; /* sectors/cluster */
  40         unsigned short cluster_bits; /* sectors/cluster */
  41         unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
  42         unsigned short fat_start;
  43         unsigned long fat_length;    /* FAT start & length (sec.) */
  44         unsigned long dir_start;
  45         unsigned short dir_entries;  /* root dir start & entries */
  46         unsigned long data_start;    /* first data sector */
  47         unsigned long clusters;      /* number of clusters */
  48         unsigned long root_cluster;  /* first cluster of the root directory */
  49         unsigned long fsinfo_sector; /* FAT32 fsinfo offset from start of disk */
  50         struct semaphore fat_lock;
  51         int prev_free;               /* previously returned free cluster number */
  52         int free_clusters;           /* -1 if undefined */
  53         struct fat_mount_options options;
  54         struct nls_table *nls_disk;  /* Codepage used on disk */
  55         struct nls_table *nls_io;    /* Charset used for input and display */
  56         void *dir_ops;               /* Opaque; default directory operations */
  57         int dir_per_block;           /* dir entries per block */
  58         int dir_per_block_bits;      /* log2(dir_per_block) */
  59
  60         spinlock_t cache_lock;
  61         struct fat_cache cache_array[FAT_CACHE_NR], *cache;
  62 };
  63
  64 #endif