libinstaller/linux/loop.h

   1 #ifndef _LINUX_LOOP_H
   2 #define _LINUX_LOOP_H
   3
   4 /*
   5  * include/linux/loop.h
   6  *
   7  * Written by Theodore Ts'o, 3/29/93.
   8  *
   9  * Copyright 1993 by Theodore Ts'o.  Redistribution of this file is
  10  * permitted under the GNU General Public License.
  11  */
  12
  13 #define LO_NAME_SIZE    64
  14 #define LO_KEY_SIZE     32
  15
  16
  17 /*
  18  * Loop flags
  19  */
  20 enum {
  21         LO_FLAGS_READ_ONLY      = 1,
  22         LO_FLAGS_USE_AOPS       = 2,
  23         LO_FLAGS_AUTOCLEAR      = 4,
  24 };
  25
  26 #include <asm/posix_types.h>    /* for __kernel_old_dev_t */
  27 #include <linux/types.h>        /* for __u64 */
  28 #include <linux/version.h>      /* version of Linux kernel headers */
  29
  30 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
  31 /* We have truly ancient Linux kernel headers installed */
  32 typedef __kernel_dev_t __kernel_old_dev_t;
  33 #endif
  34
  35 /* Backwards compatibility version */
  36 struct loop_info {
  37         int                lo_number;           /* ioctl r/o */
  38         __kernel_old_dev_t lo_device;           /* ioctl r/o */
  39         unsigned long      lo_inode;            /* ioctl r/o */
  40         __kernel_old_dev_t lo_rdevice;          /* ioctl r/o */
  41         int                lo_offset;
  42         int                lo_encrypt_type;
  43         int                lo_encrypt_key_size;         /* ioctl w/o */
  44         int                lo_flags;                    /* ioctl r/o */
  45         char               lo_name[LO_NAME_SIZE];
  46         unsigned char      lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  47         unsigned long      lo_init[2];
  48         char               reserved[4];
  49 };
  50
  51 struct loop_info64 {
  52         __u64              lo_device;                   /* ioctl r/o */
  53         __u64              lo_inode;                    /* ioctl r/o */
  54         __u64              lo_rdevice;                  /* ioctl r/o */
  55         __u64              lo_offset;
  56         __u64              lo_sizelimit;/* bytes, 0 == max available */
  57         __u32              lo_number;                   /* ioctl r/o */
  58         __u32              lo_encrypt_type;
  59         __u32              lo_encrypt_key_size;         /* ioctl w/o */
  60         __u32              lo_flags;                    /* ioctl r/o */
  61         __u8               lo_file_name[LO_NAME_SIZE];
  62         __u8               lo_crypt_name[LO_NAME_SIZE];
  63         __u8               lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  64         __u64              lo_init[2];
  65 };
  66
  67 /*
  68  * Loop filter types
  69  */
  70
  71 #define LO_CRYPT_NONE           0
  72 #define LO_CRYPT_XOR            1
  73 #define LO_CRYPT_DES            2
  74 #define LO_CRYPT_FISH2          3    /* Twofish encryption */
  75 #define LO_CRYPT_BLOW           4
  76 #define LO_CRYPT_CAST128        5
  77 #define LO_CRYPT_IDEA           6
  78 #define LO_CRYPT_DUMMY          9
  79 #define LO_CRYPT_SKIPJACK       10
  80 #define LO_CRYPT_CRYPTOAPI      18
  81 #define MAX_LO_CRYPT            20
  82
  83 /*
  84  * IOCTL commands --- we will commandeer 0x4C ('L')
  85  */
  86
  87 #define LOOP_SET_FD             0x4C00
  88 #define LOOP_CLR_FD             0x4C01
  89 #define LOOP_SET_STATUS         0x4C02
  90 #define LOOP_GET_STATUS         0x4C03
  91 #define LOOP_SET_STATUS64       0x4C04
  92 #define LOOP_GET_STATUS64       0x4C05
  93 #define LOOP_CHANGE_FD          0x4C06
  94 #define LOOP_SET_CAPACITY       0x4C07
  95
  96 #endif