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  */
  20 enum {
  21         LO_FLAGS_READ_ONLY      = 1,
  22         LO_FLAGS_AUTOCLEAR      = 4,
  23         LO_FLAGS_PARTSCAN       = 8,
  24         LO_FLAGS_DIRECT_IO      = 16,
  25 };
  26
  27 #include <asm/posix_types.h>    /* for __kernel_old_dev_t */
  28 #include <linux/types.h>        /* for __u64 */
  29
  30 /* Backwards compatibility version */
  31 struct loop_info {
  32         int                lo_number;           /* ioctl r/o */
  33         __kernel_old_dev_t lo_device;           /* ioctl r/o */
  34         unsigned long      lo_inode;            /* ioctl r/o */
  35         __kernel_old_dev_t lo_rdevice;          /* ioctl r/o */
  36         int                lo_offset;
  37         int                lo_encrypt_type;
  38         int                lo_encrypt_key_size;         /* ioctl w/o */
  39         int                lo_flags;                    /* ioctl r/o */
  40         char               lo_name[LO_NAME_SIZE];
  41         unsigned char      lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  42         unsigned long      lo_init[2];
  43         char               reserved[4];
  44 };
  45
  46 struct loop_info64 {
  47         __u64              lo_device;                   /* ioctl r/o */
  48         __u64              lo_inode;                    /* ioctl r/o */
  49         __u64              lo_rdevice;                  /* ioctl r/o */
  50         __u64              lo_offset;
  51         __u64              lo_sizelimit;/* bytes, 0 == max available */
  52         __u32              lo_number;                   /* ioctl r/o */
  53         __u32              lo_encrypt_type;
  54         __u32              lo_encrypt_key_size;         /* ioctl w/o */
  55         __u32              lo_flags;                    /* ioctl r/o */
  56         __u8               lo_file_name[LO_NAME_SIZE];
  57         __u8               lo_crypt_name[LO_NAME_SIZE];
  58         __u8               lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  59         __u64              lo_init[2];
  60 };
  61
  62 /*
  63  * Loop filter types
  64  */
  65
  66 #define LO_CRYPT_NONE           0
  67 #define LO_CRYPT_XOR            1
  68 #define LO_CRYPT_DES            2
  69 #define LO_CRYPT_FISH2          3    /* Twofish encryption */
  70 #define LO_CRYPT_BLOW           4
  71 #define LO_CRYPT_CAST128        5
  72 #define LO_CRYPT_IDEA           6
  73 #define LO_CRYPT_DUMMY          9
  74 #define LO_CRYPT_SKIPJACK       10
  75 #define LO_CRYPT_CRYPTOAPI      18
  76 #define MAX_LO_CRYPT            20
  77
  78 /*
  79  * IOCTL commands --- we will commandeer 0x4C ('L')
  80  */
  81
  82 #define LOOP_SET_FD             0x4C00
  83 #define LOOP_CLR_FD             0x4C01
  84 #define LOOP_SET_STATUS         0x4C02
  85 #define LOOP_GET_STATUS         0x4C03
  86 #define LOOP_SET_STATUS64       0x4C04
  87 #define LOOP_GET_STATUS64       0x4C05
  88 #define LOOP_CHANGE_FD          0x4C06
  89 #define LOOP_SET_CAPACITY       0x4C07
  90 #define LOOP_SET_DIRECT_IO      0x4C08
  91 #define LOOP_SET_BLOCK_SIZE     0x4C09
  92
  93 /* /dev/loop-control interface */
  94 #define LOOP_CTL_ADD            0x4C80
  95 #define LOOP_CTL_REMOVE         0x4C81
  96 #define LOOP_CTL_GET_FREE       0x4C82
  97 #endif /* _UAPI_LINUX_LOOP_H */