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include/uapi/linux/loop.h 2.38 KB
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607ca46e9   David Howells   UAPI: (Scripted) ... 
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  /*
   * include/linux/loop.h
   *
   * Written by Theodore Ts'o, 3/29/93.
   *
   * Copyright 1993 by Theodore Ts'o.  Redistribution of this file is
   * permitted under the GNU General Public License.
   */
  #ifndef _UAPI_LINUX_LOOP_H
  #define _UAPI_LINUX_LOOP_H
  
  
  #define LO_NAME_SIZE	64
  #define LO_KEY_SIZE	32
  
  
  /*
   * Loop flags
   */
  enum {
  	LO_FLAGS_READ_ONLY	= 1,
  	LO_FLAGS_AUTOCLEAR	= 4,
  	LO_FLAGS_PARTSCAN	= 8,
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  	LO_FLAGS_DIRECT_IO	= 16,
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  };
  
  #include <asm/posix_types.h>	/* for __kernel_old_dev_t */
  #include <linux/types.h>	/* for __u64 */
  
  /* Backwards compatibility version */
  struct loop_info {
  	int		   lo_number;		/* ioctl r/o */
  	__kernel_old_dev_t lo_device; 		/* ioctl r/o */
  	unsigned long	   lo_inode; 		/* ioctl r/o */
  	__kernel_old_dev_t lo_rdevice; 		/* ioctl r/o */
  	int		   lo_offset;
  	int		   lo_encrypt_type;
  	int		   lo_encrypt_key_size; 	/* ioctl w/o */
  	int		   lo_flags;			/* ioctl r/o */
  	char		   lo_name[LO_NAME_SIZE];
  	unsigned char	   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  	unsigned long	   lo_init[2];
  	char		   reserved[4];
  };
  
  struct loop_info64 {
  	__u64		   lo_device;			/* ioctl r/o */
  	__u64		   lo_inode;			/* ioctl r/o */
  	__u64		   lo_rdevice;			/* ioctl r/o */
  	__u64		   lo_offset;
  	__u64		   lo_sizelimit;/* bytes, 0 == max available */
  	__u32		   lo_number;			/* ioctl r/o */
  	__u32		   lo_encrypt_type;
  	__u32		   lo_encrypt_key_size;		/* ioctl w/o */
  	__u32		   lo_flags;			/* ioctl r/o */
  	__u8		   lo_file_name[LO_NAME_SIZE];
  	__u8		   lo_crypt_name[LO_NAME_SIZE];
  	__u8		   lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
  	__u64		   lo_init[2];
  };
  
  /*
   * Loop filter types
   */
  
  #define LO_CRYPT_NONE		0
  #define LO_CRYPT_XOR		1
  #define LO_CRYPT_DES		2
  #define LO_CRYPT_FISH2		3    /* Twofish encryption */
  #define LO_CRYPT_BLOW		4
  #define LO_CRYPT_CAST128	5
  #define LO_CRYPT_IDEA		6
  #define LO_CRYPT_DUMMY		9
  #define LO_CRYPT_SKIPJACK	10
  #define LO_CRYPT_CRYPTOAPI	18
  #define MAX_LO_CRYPT		20
  
  /*
   * IOCTL commands --- we will commandeer 0x4C ('L')
   */
  
  #define LOOP_SET_FD		0x4C00
  #define LOOP_CLR_FD		0x4C01
  #define LOOP_SET_STATUS		0x4C02
  #define LOOP_GET_STATUS		0x4C03
  #define LOOP_SET_STATUS64	0x4C04
  #define LOOP_GET_STATUS64	0x4C05
  #define LOOP_CHANGE_FD		0x4C06
  #define LOOP_SET_CAPACITY	0x4C07
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  #define LOOP_SET_DIRECT_IO	0x4C08
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  /* /dev/loop-control interface */
  #define LOOP_CTL_ADD		0x4C80
  #define LOOP_CTL_REMOVE		0x4C81
  #define LOOP_CTL_GET_FREE	0x4C82
  #endif /* _UAPI_LINUX_LOOP_H */