mount/h/loop.h

   1 /*
   2  * include/linux/loop.h
   3  *
   4  * Written by Theodore Ts'o, 3/29/93.
   5  *
   6  * Copyright 1993 by Theodore Ts'o.  Redistribution of this file is
   7  * permitted under the GNU Public License.
   8  */
   9
  10 #define LO_NAME_SIZE    64
  11 #define LO_KEY_SIZE     32
  12
  13 struct loop_info {
  14         int             lo_number;      /* ioctl r/o */
  15         dev_t           lo_device;      /* ioctl r/o */
  16         unsigned long   lo_inode;       /* ioctl r/o */
  17         dev_t           lo_rdevice;     /* ioctl r/o */
  18         int             lo_offset;
  19         int             lo_encrypt_type;
  20         int             lo_encrypt_key_size;    /* ioctl w/o */
  21         int             lo_flags;       /* ioctl r/o */
  22         char            lo_name[LO_NAME_SIZE];
  23         unsigned char   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  24         unsigned long   lo_init[2];
  25         char            reserved[4];
  26 };
  27
  28 /*
  29  * Loop encryption types --- LO_CRYPT_IDEA isn't supported yet
  30  */
  31
  32 #define LO_CRYPT_NONE   0
  33 #define LO_CRYPT_XOR    1
  34 #define LO_CRYPT_DES    2
  35 #define LO_CRYPT_IDEA   3
  36 #define MAX_LO_CRYPT    4
  37
  38 /*
  39  * IOCTL commands --- we will commandeer 0x4C ('L')
  40  */
  41
  42 #define LOOP_SET_FD     0x4C00
  43 #define LOOP_CLR_FD     0x4C01
  44 #define LOOP_SET_STATUS 0x4C02
  45 #define LOOP_GET_STATUS 0x4C03