drivers/block/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 Public License.
  11  */
  12 
  13 #define LO_NAME_SIZE    64
  14 #define LO_KEY_SIZE     32
  15        
  16 struct loop_device {
  17         int             lo_number;
  18         struct inode    *lo_inode;
  19         int             lo_refcnt;
  20         kdev_t          lo_device;
  21         int             lo_offset;
  22         int             lo_encrypt_type;
  23         int             lo_encrypt_key_size;
  24         int             lo_flags;
  25         int             (*transfer)(struct loop_device *, int cmd,
  26                                     char *raw_buf, char *loop_buf, int size);
  27         char            lo_name[LO_NAME_SIZE];
  28         char            lo_encrypt_key[LO_KEY_SIZE];
  29 #ifdef DES_AVAILABLE
  30         des_key_schedule lo_des_key;
  31         unsigned long   lo_des_init[2];
  32 #endif
  33 };
  34 
  35 typedef int (* transfer_proc_t)(struct loop_device *, int cmd,
  36                                 char *raw_buf, char *loop_buf, int size);
  37 
  38 /*
  39  * Loop flags
  40  */
  41 #define LO_FLAGS_DO_BMAP        0x00000001
  42 
  43 struct loop_info {
  44         int             lo_number;      /* ioctl r/o */
  45         dev_t           lo_device;      /* ioctl r/o */
  46         unsigned long   lo_inode;       /* ioctl r/o */
  47         dev_t           lo_rdevice;     /* ioctl r/o */
  48         int             lo_offset;
  49         int             lo_encrypt_type;
  50         int             lo_encrypt_key_size;    /* ioctl w/o */
  51         int             lo_flags;       /* ioctl r/o */
  52         char            lo_name[LO_NAME_SIZE];
  53         unsigned char   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  54         unsigned long   lo_init[2];
  55         char            reserved[4];
  56 };
  57 
  58 /*
  59  * Loop encryption types --- LO_CRYPT_IDEA isn't supported yet
  60  */
  61 
  62 #define LO_CRYPT_NONE   0
  63 #define LO_CRYPT_XOR    1
  64 #define LO_CRYPT_DES    2
  65 #define LO_CRYPT_IDEA   3
  66 #define MAX_LO_CRYPT    4
  67 
  68 /*
  69  * IOCTL commands --- we will commandeer 0x4C ('L')
  70  */
  71 
  72 #define LOOP_SET_FD     0x4C00
  73 #define LOOP_CLR_FD     0x4C01
  74 #define LOOP_SET_STATUS 0x4C02
  75 #define LOOP_GET_STATUS 0x4C03
  76 
  77 #endif
/* */
root/drivers/block/loop.h

INCLUDED FROM
