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#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 semaphore lo_sem;
struct semaphore lo_ctl_mutex;
struct semaphore lo_bh_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
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