LXR linux/include/uapi/linux/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 General Public License.
   8 */
   9#ifndef _UAPI_LINUX_LOOP_H
  10#define _UAPI_LINUX_LOOP_H
  11
  12
  13#define LO_NAME_SIZE    64
  14#define LO_KEY_SIZE     32
  15
  16
  17/*
  18 * Loop flags
  19 */
  20enum {
  21        LO_FLAGS_READ_ONLY      = 1,
  22        LO_FLAGS_AUTOCLEAR      = 4,
  23        LO_FLAGS_PARTSCAN       = 8,
  24};
  25
  26#include <asm/posix_types.h>    /* for __kernel_old_dev_t */
  27#include <linux/types.h>        /* for __u64 */
  28
  29/* Backwards compatibility version */
  30struct loop_info {
  31        int                lo_number;           /* ioctl r/o */
  32        __kernel_old_dev_t lo_device;           /* ioctl r/o */
  33        unsigned long      lo_inode;            /* ioctl r/o */
  34        __kernel_old_dev_t lo_rdevice;          /* ioctl r/o */
  35        int                lo_offset;
  36        int                lo_encrypt_type;
  37        int                lo_encrypt_key_size;         /* ioctl w/o */
  38        int                lo_flags;                    /* ioctl r/o */
  39        char               lo_name[LO_NAME_SIZE];
  40        unsigned char      lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  41        unsigned long      lo_init[2];
  42        char               reserved[4];
  43};
  44
  45struct loop_info64 {
  46        __u64              lo_device;                   /* ioctl r/o */
  47        __u64              lo_inode;                    /* ioctl r/o */
  48        __u64              lo_rdevice;                  /* ioctl r/o */
  49        __u64              lo_offset;
  50        __u64              lo_sizelimit;/* bytes, 0 == max available */
  51        __u32              lo_number;                   /* ioctl r/o */
  52        __u32              lo_encrypt_type;
  53        __u32              lo_encrypt_key_size;         /* ioctl w/o */
  54        __u32              lo_flags;                    /* ioctl r/o */
  55        __u8               lo_file_name[LO_NAME_SIZE];
  56        __u8               lo_crypt_name[LO_NAME_SIZE];
  57        __u8               lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  58        __u64              lo_init[2];
  59};
  60
  61/*
  62 * Loop filter types
  63 */
  64
  65#define LO_CRYPT_NONE           0
  66#define LO_CRYPT_XOR            1
  67#define LO_CRYPT_DES            2
  68#define LO_CRYPT_FISH2          3    /* Twofish encryption */
  69#define LO_CRYPT_BLOW           4
  70#define LO_CRYPT_CAST128        5
  71#define LO_CRYPT_IDEA           6
  72#define LO_CRYPT_DUMMY          9
  73#define LO_CRYPT_SKIPJACK       10
  74#define LO_CRYPT_CRYPTOAPI      18
  75#define MAX_LO_CRYPT            20
  76
  77/*
  78 * IOCTL commands --- we will commandeer 0x4C ('L')
  79 */
  80
  81#define LOOP_SET_FD             0x4C00
  82#define LOOP_CLR_FD             0x4C01
  83#define LOOP_SET_STATUS         0x4C02
  84#define LOOP_GET_STATUS         0x4C03
  85#define LOOP_SET_STATUS64       0x4C04
  86#define LOOP_GET_STATUS64       0x4C05
  87#define LOOP_CHANGE_FD          0x4C06
  88#define LOOP_SET_CAPACITY       0x4C07
  89
  90/* /dev/loop-control interface */
  91#define LOOP_CTL_ADD            0x4C80
  92#define LOOP_CTL_REMOVE         0x4C81
  93#define LOOP_CTL_GET_FREE       0x4C82
  94#endif /* _UAPI_LINUX_LOOP_H */
  95