[deliverable/linux.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>

/* 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 completion	lo_done;
	struct completion	lo_bh_done;
	struct semaphore	lo_ctl_mutex;
	int			lo_pending;

	request_queue_t		*lo_queue;
};

#endif /* __KERNEL__ */

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

#include <asm/posix_types.h>	/* for __kernel_old_dev_t */
#include <asm/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>
	20
	21	/* Possible states of device */
	22	enum {
	23	Lo_unbound,
	24	Lo_bound,
	25	Lo_rundown,
	26	};
	27
	28	struct loop_func_table;
	29
	30	struct loop_device {
	31	int lo_number;
	32	int lo_refcnt;
	33	loff_t lo_offset;
	34	loff_t lo_sizelimit;
	35	int lo_flags;
	36	int (transfer)(struct loop_device , int cmd,
	37	struct page *raw_page, unsigned raw_off,
	38	struct page *loop_page, unsigned loop_off,
	39	int size, sector_t real_block);
	40	char lo_file_name[LO_NAME_SIZE];
	41	char lo_crypt_name[LO_NAME_SIZE];
	42	char lo_encrypt_key[LO_KEY_SIZE];
	43	int lo_encrypt_key_size;
	44	struct loop_func_table *lo_encryption;
	45	__u32 lo_init[2];
	46	uid_t lo_key_owner; /* Who set the key */
	47	int (ioctl)(struct loop_device , int cmd,
	48	unsigned long arg);
	49
	50	struct file * lo_backing_file;
	51	struct block_device *lo_device;
	52	unsigned lo_blocksize;
	53	void *key_data;
	54
b4e3ca1a	55	gfp_t old_gfp_mask;
1da177e4 LT	56
	57	spinlock_t lo_lock;
	58	struct bio *lo_bio;
	59	struct bio *lo_biotail;
	60	int lo_state;
11b751ae IM	61	struct completion lo_done;
11b751ae IM	62	struct completion lo_bh_done;
1da177e4	63	struct semaphore lo_ctl_mutex;
35a82d1a	64	int lo_pending;
1da177e4 LT	65
	66	request_queue_t *lo_queue;
	67	};
	68
	69	#endif /* __KERNEL__ */
	70
	71	/*
	72	* Loop flags
	73	*/
	74	enum {
	75	LO_FLAGS_READ_ONLY = 1,
	76	LO_FLAGS_USE_AOPS = 2,
	77	};
	78
	79	#include <asm/posix_types.h> /* for __kernel_old_dev_t */
	80	#include <asm/types.h> /* for __u64 */
	81
	82	/* Backwards compatibility version */
	83	struct loop_info {
	84	int lo_number; /* ioctl r/o */
	85	__kernel_old_dev_t lo_device; /* ioctl r/o */
	86	unsigned long lo_inode; /* ioctl r/o */
	87	__kernel_old_dev_t lo_rdevice; /* ioctl r/o */
	88	int lo_offset;
	89	int lo_encrypt_type;
	90	int lo_encrypt_key_size; /* ioctl w/o */
	91	int lo_flags; /* ioctl r/o */
	92	char lo_name[LO_NAME_SIZE];
	93	unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
	94	unsigned long lo_init[2];
	95	char reserved[4];
	96	};
	97
	98	struct loop_info64 {
	99	__u64 lo_device; /* ioctl r/o */
	100	__u64 lo_inode; /* ioctl r/o */
	101	__u64 lo_rdevice; /* ioctl r/o */
	102	__u64 lo_offset;
	103	__u64 lo_sizelimit;/* bytes, 0 == max available */
	104	__u32 lo_number; /* ioctl r/o */
	105	__u32 lo_encrypt_type;
	106	__u32 lo_encrypt_key_size; /* ioctl w/o */
	107	__u32 lo_flags; /* ioctl r/o */
	108	__u8 lo_file_name[LO_NAME_SIZE];
	109	__u8 lo_crypt_name[LO_NAME_SIZE];
	110	__u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
	111	__u64 lo_init[2];
	112	};
	113
	114	/*
	115	* Loop filter types
	116	*/
	117
	118	#define LO_CRYPT_NONE 0
	119	#define LO_CRYPT_XOR 1
	120	#define LO_CRYPT_DES 2
	121	#define LO_CRYPT_FISH2 3 /* Twofish encryption */
	122	#define LO_CRYPT_BLOW 4
	123	#define LO_CRYPT_CAST128 5
	124	#define LO_CRYPT_IDEA 6
	125	#define LO_CRYPT_DUMMY 9
	126	#define LO_CRYPT_SKIPJACK 10
	127	#define LO_CRYPT_CRYPTOAPI 18
	128	#define MAX_LO_CRYPT 20
129
130	#ifdef __KERNEL__
131	/* Support for loadable transfer modules */
132	struct loop_func_table {
133	int number; /* filter type */
134	int (transfer)(struct loop_device lo, int cmd,
135	struct page *raw_page, unsigned raw_off,
136	struct page *loop_page, unsigned loop_off,
137	int size, sector_t real_block);
138	int (init)(struct loop_device , const struct loop_info64 *);
139	/* release is called from loop_unregister_transfer or clr_fd */
140	int (release)(struct loop_device );
141	int (ioctl)(struct loop_device , int cmd, unsigned long arg);
142	struct module *owner;
143	};
144
145	int loop_register_transfer(struct loop_func_table *funcs);
146	int loop_unregister_transfer(int number);
147
148	#endif
149	/*
150	* IOCTL commands --- we will commandeer 0x4C ('L')
151	*/
152
153	#define LOOP_SET_FD 0x4C00
154	#define LOOP_CLR_FD 0x4C01
155	#define LOOP_SET_STATUS 0x4C02
156	#define LOOP_GET_STATUS 0x4C03
157	#define LOOP_SET_STATUS64 0x4C04
158	#define LOOP_GET_STATUS64 0x4C05
159	#define LOOP_CHANGE_FD 0x4C06
160
161	#endif