include/linux/msdos_fs.h

   1 #ifndef _LINUX_MSDOS_FS_H
   2 #define _LINUX_MSDOS_FS_H
   3
   4 /*
   5  * The MS-DOS filesystem constants/structures
   6  */
   7 #include <linux/fs.h>
   8 #include <linux/stat.h>
   9 #include <linux/fd.h>
  10 #include <linux/config.h>
  11
  12 #include <asm/byteorder.h>
  13
  14 #define MSDOS_ROOT_INO  1 /* == MINIX_ROOT_INO */
  15 #define SECTOR_SIZE     512 /* sector size (bytes) */
  16 #define SECTOR_BITS     9 /* log2(SECTOR_SIZE) */
  17 #define MSDOS_DPB       (MSDOS_DPS) /* dir entries per block */
  18 #define MSDOS_DPB_BITS  4 /* log2(MSDOS_DPB) */
  19 #define MSDOS_DPS       (SECTOR_SIZE/sizeof(struct msdos_dir_entry))
  20 #define MSDOS_DPS_BITS  4 /* log2(MSDOS_DPS) */
  21 #define MSDOS_DIR_BITS  5 /* log2(sizeof(struct msdos_dir_entry)) */
  22
  23 #define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
  24
  25 #define FAT_CACHE    8 /* FAT cache size */
  26
  27 #define MSDOS_MAX_EXTRA 3 /* tolerate up to that number of clusters which are
  28                              inaccessible because the FAT is too short */
  29
  30 #define ATTR_RO      1  /* read-only */
  31 #define ATTR_HIDDEN  2  /* hidden */
  32 #define ATTR_SYS     4  /* system */
  33 #define ATTR_VOLUME  8  /* volume label */
  34 #define ATTR_DIR     16 /* directory */
  35 #define ATTR_ARCH    32 /* archived */
  36
  37 #define ATTR_NONE    0 /* no attribute bits */
  38 #define ATTR_UNUSED  (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
  39         /* attribute bits that are copied "as is" */
  40 #define ATTR_EXT     (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
  41         /* bits that are used by the Windows 95/Windows NT extended FAT */
  42
  43 #define ATTR_DIR_READ_BOTH 512 /* read both short and long names from the
  44                                 * vfat filesystem.  This is used by Samba
  45                                 * to export the vfat filesystem with correct
  46                                 * shortnames. */
  47 #define ATTR_DIR_READ_SHORT 1024
  48
  49 #define CASE_LOWER_BASE 8       /* base is lower case */
  50 #define CASE_LOWER_EXT  16      /* extension is lower case */
  51
  52 #define SCAN_ANY     0  /* either hidden or not */
  53 #define SCAN_HID     1  /* only hidden */
  54 #define SCAN_NOTHID  2  /* only not hidden */
  55 #define SCAN_NOTANY  3  /* test name, then use SCAN_HID or SCAN_NOTHID */
  56
  57 #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
  58 #define IS_FREE(n) (!*(n) || *(const unsigned char *) (n) == DELETED_FLAG || \
  59   *(const unsigned char *) (n) == FD_FILL_BYTE)
  60
  61 #define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
  62         /* valid file mode bits */
  63
  64 #define MSDOS_SB(s) (&((s)->u.msdos_sb))
  65 #define MSDOS_I(i) (&((i)->u.msdos_i))
  66
  67 #define MSDOS_NAME 11 /* maximum name length */
  68 #define MSDOS_LONGNAME 256 /* maximum name length */
  69 #define MSDOS_SLOTS 21  /* max # of slots needed for short and long names */
  70 #define MSDOS_DOT    ".          " /* ".", padded to MSDOS_NAME chars */
  71 #define MSDOS_DOTDOT "..         " /* "..", padded to MSDOS_NAME chars */
  72
  73 #define MSDOS_FAT12 4078 /* maximum number of clusters in a 12 bit FAT */
  74
  75 #ifdef CONFIG_ATARI
  76 #define EOF_FAT12 0xFFF         /* Atari GEMDOS fs uses a different EOF */
  77 #define EOF_FAT16 0xFFFF
  78 #else
  79 #define EOF_FAT12 0xFF8         /* standard EOF */
  80 #define EOF_FAT16 0xFFF8
  81 #endif
  82
  83 /*
  84  * Inode flags
  85  */
  86 #define FAT_BINARY_FL           0x00000001 /* File contains binary data */
  87
  88 /*
  89  * ioctl commands
  90  */
  91 #define VFAT_IOCTL_READDIR_BOTH         _IOR('r', 1, long)
  92 #define VFAT_IOCTL_READDIR_SHORT        _IOW('r', 2, long)
  93
  94 /*
  95  * Conversion from and to little-endian byte order. (no-op on i386/i486)
  96  *
  97  * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian,
  98  * BE = big-endian, c: W = word (16 bits), L = longword (32 bits)
  99  */
 100
 101 #define CF_LE_W(v) le16_to_cpu(v)
 102 #define CF_LE_L(v) le32_to_cpu(v)
 103 #define CT_LE_W(v) cpu_to_le16(v)
 104 #define CT_LE_L(v) cpu_to_le32(v)
 105
 106 struct msdos_boot_sector {
 107         __s8    ignored[3];     /* Boot strap short or near jump */
 108         __s8    system_id[8];   /* Name - can be used to special case
 109                                    partition manager volumes */
 110         __u8    sector_size[2]; /* bytes per logical sector */
 111         __u8    cluster_size;   /* sectors/cluster */
 112         __u16   reserved;       /* reserved sectors */
 113         __u8    fats;           /* number of FATs */
 114         __u8    dir_entries[2]; /* root directory entries */
 115         __u8    sectors[2];     /* number of sectors */
 116         __u8    media;          /* media code (unused) */
 117         __u16   fat_length;     /* sectors/FAT */
 118         __u16   secs_track;     /* sectors per track */
 119         __u16   heads;          /* number of heads */
 120         __u32   hidden;         /* hidden sectors (unused) */
 121         __u32   total_sect;     /* number of sectors (if sectors == 0) */
 122 };
 123
 124 struct msdos_dir_entry {
 125         __s8    name[8],ext[3]; /* name and extension */
 126         __u8    attr;           /* attribute bits */
 127         __u8    lcase;          /* Case for base and extension */
 128         __u8    ctime_ms;       /* Creation time, milliseconds */
 129         __u16   ctime;          /* Creation time */
 130         __u16   cdate;          /* Creation date */
 131         __u16   adate;          /* Last access date */
 132         __u8    unused[2];
 133         __u16   time,date,start;/* time, date and first cluster */
 134         __u32   size;           /* file size (in bytes) */
 135 };
 136
 137 /* Up to 13 characters of the name */
 138 struct msdos_dir_slot {
 139         __u8    id;             /* sequence number for slot */
 140         __u8    name0_4[10];    /* first 5 characters in name */
 141         __u8    attr;           /* attribute byte */
 142         __u8    reserved;       /* always 0 */
 143         __u8    alias_checksum; /* checksum for 8.3 alias */
 144         __u8    name5_10[12];   /* 6 more characters in name */
 145         __u8    start[2];       /* starting cluster number */
 146         __u8    name11_12[4];   /* last 2 characters in name */
 147 };
 148
 149 struct slot_info {
 150         int is_long;                   /* was the found entry long */
 151         int long_slots;                /* number of long slots in filename */
 152         int total_slots;               /* total slots (long and short) */
 153         loff_t longname_offset;        /* dir offset for longname start */
 154         loff_t shortname_offset;       /* dir offset for shortname start */
 155         int ino;                       /* ino for the file */
 156 };
 157
 158 /* Determine whether this FS has kB-aligned data. */
 159 #define MSDOS_CAN_BMAP(mib) (!(((mib)->cluster_size & 1) || \
 160     ((mib)->data_start & 1)))
 161
 162 /* Convert attribute bits and a mask to the UNIX mode. */
 163 #define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
 164
 165 /* Convert the UNIX mode to MS-DOS attribute bits. */
 166 #define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
 167
 168
 169 #ifdef __KERNEL__
 170
 171 typedef int (*fat_filldir_t)(filldir_t filldir, void *, const char *,
 172                              int, int, off_t, off_t, int, ino_t);
 173
 174 struct fat_cache {
 175         kdev_t device; /* device number. 0 means unused. */
 176         int ino; /* inode number. */
 177         int file_cluster; /* cluster number in the file. */
 178         int disk_cluster; /* cluster number on disk. */
 179         struct fat_cache *next; /* next cache entry */
 180 };
 181
 182 /* misc.c */
 183 extern int is_binary(char conversion,char *extension);
 184 extern void lock_fat(struct super_block *sb);
 185 extern void unlock_fat(struct super_block *sb);
 186 extern int fat_add_cluster(struct inode *inode);
 187 extern int date_dos2unix(__u16 time, __u16 date);
 188 extern void fat_fs_panic(struct super_block *s,const char *msg);
 189 extern void fat_lock_creation(void);
 190 extern void fat_unlock_creation(void);
 191 extern void fat_date_unix2dos(int unix_date,__u16 *time, __u16 *date);
 192 extern int fat_get_entry(struct inode *dir,loff_t *pos,struct buffer_head **bh,
 193                          struct msdos_dir_entry **de);
 194 extern int fat_scan(struct inode *dir,const char *name,struct buffer_head **res_bh,
 195                     struct msdos_dir_entry **res_de,int *ino,char scantype);
 196 extern int fat_parent_ino(struct inode *dir,int locked);
 197 extern int fat_subdirs(struct inode *dir);
 198
 199 /* fat.c */
 200 extern int fat_access(struct super_block *sb,int nr,int new_value);
 201 extern int fat_smap(struct inode *inode,int sector);
 202 extern int fat_free(struct inode *inode,int skip);
 203 void fat_cache_inval_inode(struct inode *inode);
 204 void fat_cache_inval_dev(kdev_t device);
 205 extern void cache_init(void);
 206 void cache_lookup(struct inode *inode,int cluster,int *f_clu,int *d_clu);
 207 void cache_add(struct inode *inode,int f_clu,int d_clu);
 208 int get_cluster(struct inode *inode,int cluster);
 209
 210 /* inode.c */
 211 extern int fat_bmap(struct inode *inode,int block);
 212 extern int fat_notify_change(struct inode *,struct iattr *);
 213 extern void fat_put_inode(struct inode *inode);
 214 extern void fat_put_super(struct super_block *sb);
 215 extern void fat_read_inode(struct inode *inode, struct inode_operations *dir_ops);
 216 extern struct super_block *fat_read_super(struct super_block *s, void *data, int silent);
 217 extern void msdos_put_super(struct super_block *sb);
 218 extern void fat_statfs(struct super_block *sb,struct statfs *buf, int);
 219 extern void fat_write_inode(struct inode *inode);
 220
 221 /* dir.c */
 222 extern struct file_operations fat_dir_operations;
 223 extern int fat_readdirx(struct inode *inode, struct file *filp, void *dirent,
 224                         fat_filldir_t fat_filldir, filldir_t filldir,
 225                         int shortnames, int longnames, int both);
 226 extern int fat_readdir(struct inode *inode, struct file *filp,
 227                        void *dirent, filldir_t);
 228 extern int fat_dir_ioctl(struct inode * inode, struct file * filp,
 229                          unsigned int cmd, unsigned long arg);
 230
 231 /* file.c */
 232 extern struct inode_operations fat_file_inode_operations;
 233 extern struct inode_operations fat_file_inode_operations_1024;
 234 extern long fat_file_read(struct inode *, struct file *, char *, unsigned long);
 235 extern long fat_file_write(struct inode *, struct file *, const char *, unsigned long);
 236 extern void fat_truncate(struct inode *inode);
 237
 238 /* mmap.c */
 239 extern int fat_mmap(struct inode *, struct file *, struct vm_area_struct *);
 240
 241
 242 /* vfat.c */
 243 extern int init_vfat_fs(void);
 244
 245
 246 /* msdosfs_syms.c */
 247 extern int init_msdos_fs(void);
 248 extern struct file_system_type msdos_fs_type;
 249
 250 /* msdos.c */
 251 extern struct super_block *msdos_read_super(struct super_block *sb,void *data, int silent);
 252
 253 /* msdos.c - these are for Umsdos */
 254 extern void msdos_read_inode(struct inode *inode);
 255 extern int msdos_lookup(struct inode *dir,const char *name,int len,
 256                         struct inode **result);
 257 extern int msdos_create(struct inode *dir,const char *name,int len,int mode,
 258                         struct inode **result);
 259 extern int msdos_rmdir(struct inode *dir,const char *name,int len);
 260 extern int msdos_mkdir(struct inode *dir,const char *name,int len,int mode);
 261 extern int msdos_unlink(struct inode *dir,const char *name,int len);
 262 extern int msdos_unlink_umsdos(struct inode *dir,const char *name,int len);
 263 extern int msdos_rename(struct inode *old_dir,const char *old_name,int old_len,
 264                         struct inode *new_dir,const char *new_name,int new_len,
 265                         int must_be_dir);
 266
 267 /* fatfs_syms.c */
 268 extern int init_fat_fs(void);
 269
 270 /* vfat/namei.c - these are for dmsdos */
 271 extern int vfat_create(struct inode *dir,const char *name,int len,int mode,
 272                        struct inode **result);
 273 extern int vfat_unlink(struct inode *dir,const char *name,int len);
 274 extern int vfat_mkdir(struct inode *dir,const char *name,int len,int mode);
 275 extern int vfat_rmdir(struct inode *dir,const char *name,int len);
 276 extern int vfat_rename(struct inode *old_dir,const char *old_name,int old_len,
 277                        struct inode *new_dir,const char *new_name,int new_len,
 278                        int must_be_dir);
 279 extern void vfat_put_super(struct super_block *sb);
 280 extern struct super_block *vfat_read_super(struct super_block *sb,void *data,
 281                                            int silent);
 282 extern void vfat_read_inode(struct inode *inode);
 283 extern int vfat_lookup(struct inode *dir,const char *name,int len,
 284                        struct inode **result);
 285
 286 #endif /* __KERNEL__ */
 287
 288 #endif