include/linux/msdos

/* */
   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 
  11 #define MSDOS_ROOT_INO  1 /* == MINIX_ROOT_INO */
  12 #define SECTOR_SIZE     512 /* sector size (bytes) */
  13 #define SECTOR_BITS     9 /* log2(SECTOR_SIZE) */
  14 #define MSDOS_DPB       (MSDOS_DPS) /* dir entries per block */
  15 #define MSDOS_DPB_BITS  4 /* log2(MSDOS_DPB) */
  16 #define MSDOS_DPS       (SECTOR_SIZE/sizeof(struct msdos_dir_entry))
  17 #define MSDOS_DPS_BITS  4 /* log2(MSDOS_DPS) */
  18 #define MSDOS_DIR_BITS  5 /* log2(sizeof(struct msdos_dir_entry)) */
  19 
  20 #define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
  21 
  22 #define FAT_CACHE    8 /* FAT cache size */
  23 
  24 #define MSDOS_MAX_EXTRA 3 /* tolerate up to that number of clusters which are
  25                              inaccessible because the FAT is too short */
  26 
  27 #define ATTR_RO      1  /* read-only */
  28 #define ATTR_HIDDEN  2  /* hidden */
  29 #define ATTR_SYS     4  /* system */
  30 #define ATTR_VOLUME  8  /* volume label */
  31 #define ATTR_DIR     16 /* directory */
  32 #define ATTR_ARCH    32 /* archived */
  33 
  34 #define ATTR_NONE    0 /* no attribute bits */
  35 #define ATTR_UNUSED  (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
  36         /* attribute bits that are copied "as is" */
  37 
  38 #define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
  39 #define IS_FREE(n) (!*(n) || *(const unsigned char *) (n) == DELETED_FLAG || \
  40   *(const unsigned char *) (n) == FD_FILL_BYTE)
  41 
  42 #define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
  43         /* valid file mode bits */
  44 
  45 #define MSDOS_SB(s) (&((s)->u.msdos_sb))
  46 #define MSDOS_I(i) (&((i)->u.msdos_i))
  47 
  48 #define MSDOS_NAME 11 /* maximum name length */
  49 #define MSDOS_DOT    ".          " /* ".", padded to MSDOS_NAME chars */
  50 #define MSDOS_DOTDOT "..         " /* "..", padded to MSDOS_NAME chars */
  51 
  52 #define MSDOS_FAT12 4078 /* maximum number of clusters in a 12 bit FAT */
  53 
  54 /*
  55  * Conversion from and to little-endian byte order. (no-op on i386/i486)
  56  *
  57  * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian, BE = big-
  58  * endian, c: W = word (16 bits), L = longword (32 bits)
  59  */
  60 
  61 #define CF_LE_W(v) (v)
  62 #define CF_LE_L(v) (v)
  63 #define CT_LE_W(v) (v)
  64 #define CT_LE_L(v) (v)
  65 
  66 
  67 struct msdos_boot_sector {
  68         __s8    ignored[3];     /* Boot strap short or near jump */
  69         __s8    system_id[8];   /* Name - can be used to special case
  70                                    partition manager volumes */
  71         __u8    sector_size[2]; /* bytes per logical sector */
  72         __u8    cluster_size;   /* sectors/cluster */
  73         __u16   reserved;       /* reserved sectors */
  74         __u8    fats;           /* number of FATs */
  75         __u8    dir_entries[2]; /* root directory entries */
  76         __u8    sectors[2];     /* number of sectors */
  77         __u8    media;          /* media code (unused) */
  78         __u16   fat_length;     /* sectors/FAT */
  79         __u16   secs_track;     /* sectors per track */
  80         __u16   heads;          /* number of heads */
  81         __u32   hidden;         /* hidden sectors (unused) */
  82         __u32   total_sect;     /* number of sectors (if sectors == 0) */
  83 };
  84 
  85 struct msdos_dir_entry {
  86         __s8    name[8],ext[3]; /* name and extension */
  87         __u8    attr;           /* attribute bits */
  88         __u8    unused[10];
  89         __u16   time,date,start;/* time, date and first cluster */
  90         __u32   size;           /* file size (in bytes) */
  91 };
  92 
  93 struct fat_cache {
  94         kdev_t device; /* device number. 0 means unused. */
  95         int ino; /* inode number. */
  96         int file_cluster; /* cluster number in the file. */
  97         int disk_cluster; /* cluster number on disk. */
  98         struct fat_cache *next; /* next cache entry */
  99 };
 100 
 101 /* Determine whether this FS has kB-aligned data. */
 102 
 103 #define MSDOS_CAN_BMAP(mib) (!(((mib)->cluster_size & 1) || \
 104     ((mib)->data_start & 1)))
 105 
 106 /* Convert attribute bits and a mask to the UNIX mode. */
 107 
 108 #define MSDOS_MKMODE(a,m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
 109 
 110 /* Convert the UNIX mode to MS-DOS attribute bits. */
 111 
 112 #define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
 113 
 114 #ifdef __KERNEL__
 115 
 116 /* misc.c */
 117 
 118 extern void fs_panic(struct super_block *s,const char *msg);
 119 extern int is_binary(char conversion,char *extension);
 120 extern void lock_creation(void);
 121 extern void unlock_creation(void);
 122 extern void lock_fat(struct super_block *sb);
 123 extern void unlock_fat(struct super_block *sb);
 124 extern int msdos_add_cluster(struct inode *inode);
 125 extern int date_dos2unix(__u16 time, __u16 date);
 126 extern void date_unix2dos(int unix_date,__u16 *time, __u16 *date);
 127 extern int msdos_get_entry(struct inode *dir,loff_t *pos,struct buffer_head **bh,
 128     struct msdos_dir_entry **de);
 129 extern int msdos_scan(struct inode *dir,const char *name,struct buffer_head **res_bh,
 130     struct msdos_dir_entry **res_de,int *ino);
 131 extern int msdos_parent_ino(struct inode *dir,int locked);
 132 extern int msdos_subdirs(struct inode *dir);
 133 
 134 /* fat.c */
 135 
 136 extern int fat_access(struct super_block *sb,int nr,int new_value);
 137 extern int msdos_smap(struct inode *inode,int sector);
 138 extern int fat_free(struct inode *inode,int skip);
 139 extern void cache_init(void);
 140 void cache_lookup(struct inode *inode,int cluster,int *f_clu,int *d_clu);
 141 void cache_add(struct inode *inode,int f_clu,int d_clu);
 142 void cache_inval_inode(struct inode *inode);
 143 void cache_inval_dev(kdev_t device);
 144 int get_cluster(struct inode *inode,int cluster);
 145 
 146 /* namei.c */
 147 
 148 extern int msdos_lookup(struct inode *dir,const char *name,int len,
 149         struct inode **result);
 150 extern int msdos_create(struct inode *dir,const char *name,int len,int mode,
 151         struct inode **result);
 152 extern int msdos_mkdir(struct inode *dir,const char *name,int len,int mode);
 153 extern int msdos_rmdir(struct inode *dir,const char *name,int len);
 154 extern int msdos_unlink(struct inode *dir,const char *name,int len);
 155 extern int msdos_unlink_umsdos(struct inode *dir,const char *name,int len);
 156 extern int msdos_rename(struct inode *old_dir,const char *old_name,int old_len,
 157         struct inode *new_dir,const char *new_name,int new_len);
 158 
 159 /* inode.c */
 160 
 161 extern void msdos_put_inode(struct inode *inode);
 162 extern void msdos_put_super(struct super_block *sb);
 163 extern struct super_block *msdos_read_super(struct super_block *s,
 164                                             void *data,int);
 165 extern void msdos_statfs(struct super_block *sb,struct statfs *buf, int);
 166 extern int msdos_bmap(struct inode *inode,int block);
 167 extern void msdos_read_inode(struct inode *inode);
 168 extern void msdos_write_inode(struct inode *inode);
 169 extern int msdos_notify_change(struct inode *,struct iattr *);
 170 
 171 /* dir.c */
 172 
 173 extern struct inode_operations msdos_dir_inode_operations;
 174 extern int msdos_readdir (struct inode *inode, struct file *filp,
 175         void *dirent, filldir_t);
 176 /* file.c */
 177 
 178 extern struct inode_operations msdos_file_inode_operations;
 179 extern struct inode_operations msdos_file_inode_operations_1024;
 180 extern int msdos_file_read(struct inode *, struct file *, char *, int);
 181 extern int msdos_file_write(struct inode *, struct file *, const char *, int);
 182 extern struct inode_operations msdos_file_inode_operations_no_bmap;
 183 
 184 extern void msdos_truncate(struct inode *inode);
 185 
 186 /* mmap.c */
 187 extern int msdos_mmap(struct inode *, struct file *, struct vm_area_struct *);
 188 
 189 #endif /* __KERNEL__ */
 190 
 191 #endif
/* */
root/include/linux/msdos_fs.h

INCLUDED FROM
