[linux-2.6-block.git] / include / linux / loop.h

#ifndef _LINUX_LOOP_H
#define _LINUX_LOOP_H

/*
 * 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.
 */

#define LO_NAME_SIZE	64
#define LO_KEY_SIZE	32

#ifdef __KERNEL__
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>

/* Possible states of device */
enum {
	Lo_unbound,
	Lo_bound,
	Lo_rundown,
};

struct loop_func_table;

struct loop_device {
	int		lo_number;
	int		lo_refcnt;
	loff_t		lo_offset;
	loff_t		lo_sizelimit;
	int		lo_flags;
	int		(*transfer)(struct loop_device *, int cmd,
				    struct page *raw_page, unsigned raw_off,
				    struct page *loop_page, unsigned loop_off,
				    int size, sector_t real_block);
	char		lo_file_name[LO_NAME_SIZE];
	char		lo_crypt_name[LO_NAME_SIZE];
	char		lo_encrypt_key[LO_KEY_SIZE];
	int		lo_encrypt_key_size;
	struct loop_func_table *lo_encryption;
	__u32           lo_init[2];
	uid_t		lo_key_owner;	/* Who set the key */
	int		(*ioctl)(struct loop_device *, int cmd, 
				 unsigned long arg); 

	struct file *	lo_backing_file;
	struct block_device *lo_device;
	unsigned	lo_blocksize;
	void		*key_data; 

	gfp_t		old_gfp_mask;

	spinlock_t		lo_lock;
	struct bio 		*lo_bio;
	struct bio		*lo_biotail;
	int			lo_state;
	struct mutex		lo_ctl_mutex;
	struct task_struct	*lo_thread;
	wait_queue_head_t	lo_event;

	struct request_queue	*lo_queue;
	struct gendisk		*lo_disk;
	struct list_head	lo_list;
};

#endif /* __KERNEL__ */

/*
 * Loop flags
 */
enum {
	LO_FLAGS_READ_ONLY	= 1,
	LO_FLAGS_USE_AOPS	= 2,
	LO_FLAGS_AUTOCLEAR	= 4,
};

#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

#ifdef __KERNEL__
/* Support for loadable transfer modules */
struct loop_func_table {
	int number;	/* filter type */ 
	int (*transfer)(struct loop_device *lo, int cmd,
			struct page *raw_page, unsigned raw_off,
			struct page *loop_page, unsigned loop_off,
			int size, sector_t real_block);
	int (*init)(struct loop_device *, const struct loop_info64 *); 
	/* release is called from loop_unregister_transfer or clr_fd */
	int (*release)(struct loop_device *); 
	int (*ioctl)(struct loop_device *, int cmd, unsigned long arg);
	struct module *owner;
}; 

int loop_register_transfer(struct loop_func_table *funcs);
int loop_unregister_transfer(int number); 

#endif
/*
 * 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

#endif
Commit	Line	Data
1da177e4 LT	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	#ifdef __KERNEL__
	17	#include <linux/bio.h>
	18	#include <linux/blkdev.h>
	19	#include <linux/spinlock.h>
f85221dd	20	#include <linux/mutex.h>
1da177e4 LT	21
	22	/* Possible states of device */
	23	enum {
	24	Lo_unbound,
	25	Lo_bound,
	26	Lo_rundown,
	27	};
	28
	29	struct loop_func_table;
	30
	31	struct loop_device {
	32	int lo_number;
	33	int lo_refcnt;
	34	loff_t lo_offset;
	35	loff_t lo_sizelimit;
	36	int lo_flags;
	37	int (transfer)(struct loop_device , int cmd,
	38	struct page *raw_page, unsigned raw_off,
	39	struct page *loop_page, unsigned loop_off,
	40	int size, sector_t real_block);
	41	char lo_file_name[LO_NAME_SIZE];
	42	char lo_crypt_name[LO_NAME_SIZE];
	43	char lo_encrypt_key[LO_KEY_SIZE];
	44	int lo_encrypt_key_size;
	45	struct loop_func_table *lo_encryption;
	46	__u32 lo_init[2];
	47	uid_t lo_key_owner; /* Who set the key */
	48	int (ioctl)(struct loop_device , int cmd,
	49	unsigned long arg);
	50
	51	struct file * lo_backing_file;
	52	struct block_device *lo_device;
	53	unsigned lo_blocksize;
	54	void *key_data;
	55
b4e3ca1a	56	gfp_t old_gfp_mask;
1da177e4 LT	57
	58	spinlock_t lo_lock;
	59	struct bio *lo_bio;
	60	struct bio *lo_biotail;
	61	int lo_state;
f85221dd	62	struct mutex lo_ctl_mutex;
6c997918 SH	63	struct task_struct *lo_thread;
6c997918 SH	64	wait_queue_head_t lo_event;
1da177e4	65
01e457cf	66	struct request_queue *lo_queue;
73285082 KC	67	struct gendisk *lo_disk;
73285082 KC	68	struct list_head lo_list;
1da177e4 LT	69	};
	70
	71	#endif /* __KERNEL__ */
	72
	73	/*
	74	* Loop flags
	75	*/
	76	enum {
	77	LO_FLAGS_READ_ONLY = 1,
	78	LO_FLAGS_USE_AOPS = 2,
96c58655	79	LO_FLAGS_AUTOCLEAR = 4,
1da177e4 LT	80	};
	81
	82	#include <asm/posix_types.h> /* for __kernel_old_dev_t */
00bfddaf	83	#include <linux/types.h> /* for __u64 */
1da177e4 LT	84
	85	/* Backwards compatibility version */
	86	struct loop_info {
	87	int lo_number; /* ioctl r/o */
	88	__kernel_old_dev_t lo_device; /* ioctl r/o */
	89	unsigned long lo_inode; /* ioctl r/o */
	90	__kernel_old_dev_t lo_rdevice; /* ioctl r/o */
	91	int lo_offset;
	92	int lo_encrypt_type;
	93	int lo_encrypt_key_size; /* ioctl w/o */
	94	int lo_flags; /* ioctl r/o */
	95	char lo_name[LO_NAME_SIZE];
	96	unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
	97	unsigned long lo_init[2];
	98	char reserved[4];
	99	};
	100
	101	struct loop_info64 {
	102	__u64 lo_device; /* ioctl r/o */
	103	__u64 lo_inode; /* ioctl r/o */
	104	__u64 lo_rdevice; /* ioctl r/o */
	105	__u64 lo_offset;
	106	__u64 lo_sizelimit;/* bytes, 0 == max available */
	107	__u32 lo_number; /* ioctl r/o */
	108	__u32 lo_encrypt_type;
	109	__u32 lo_encrypt_key_size; /* ioctl w/o */
	110	__u32 lo_flags; /* ioctl r/o */
	111	__u8 lo_file_name[LO_NAME_SIZE];
	112	__u8 lo_crypt_name[LO_NAME_SIZE];
	113	__u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
	114	__u64 lo_init[2];
	115	};
	116
	117	/*
	118	* Loop filter types
	119	*/
	120
	121	#define LO_CRYPT_NONE 0
	122	#define LO_CRYPT_XOR 1
	123	#define LO_CRYPT_DES 2
	124	#define LO_CRYPT_FISH2 3 /* Twofish encryption */
	125	#define LO_CRYPT_BLOW 4
	126	#define LO_CRYPT_CAST128 5
	127	#define LO_CRYPT_IDEA 6
	128	#define LO_CRYPT_DUMMY 9
	129	#define LO_CRYPT_SKIPJACK 10
	130	#define LO_CRYPT_CRYPTOAPI 18
	131	#define MAX_LO_CRYPT 20
	132
	133	#ifdef __KERNEL__
	134	/* Support for loadable transfer modules */
	135	struct loop_func_table {
	136	int number; /* filter type */
	137	int (transfer)(struct loop_device lo, int cmd,
	138	struct page *raw_page, unsigned raw_off,
	139	struct page *loop_page, unsigned loop_off,
	140	int size, sector_t real_block);
	141	int (init)(struct loop_device , const struct loop_info64 *);
	142	/* release is called from loop_unregister_transfer or clr_fd */
	143	int (release)(struct loop_device );
	144	int (ioctl)(struct loop_device , int cmd, unsigned long arg);
	145	struct module *owner;
	146	};
	147
148	int loop_register_transfer(struct loop_func_table *funcs);
149	int loop_unregister_transfer(int number);
150
151	#endif
152	/*
153	* IOCTL commands --- we will commandeer 0x4C ('L')
154	*/
155
156	#define LOOP_SET_FD 0x4C00
157	#define LOOP_CLR_FD 0x4C01
158	#define LOOP_SET_STATUS 0x4C02
159	#define LOOP_GET_STATUS 0x4C03
160	#define LOOP_SET_STATUS64 0x4C04
161	#define LOOP_GET_STATUS64 0x4C05
162	#define LOOP_CHANGE_FD 0x4C06
163
164	#endif