[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / 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.
 */
#ifndef _LINUX_LOOP_H
#define _LINUX_LOOP_H

#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <uapi/linux/loop.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];
	kuid_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_list		lo_bio_list;
	unsigned int		lo_bio_count;
	int			lo_state;
	struct mutex		lo_ctl_mutex;
	struct task_struct	*lo_thread;
	wait_queue_head_t	lo_event;
	/* wait queue for incoming requests */
	wait_queue_head_t	lo_req_wait;

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

/* 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
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/linux/loop.h
	3	*
	4	* Written by Theodore Ts'o, 3/29/93.
	5	*
	6	* Copyright 1993 by Theodore Ts'o. Redistribution of this file is
	7	* permitted under the GNU General Public License.
	8	*/
607ca46e DH	9	#ifndef _LINUX_LOOP_H
607ca46e DH	10	#define _LINUX_LOOP_H
1da177e4	11
1da177e4 LT	12	#include <linux/bio.h>
	13	#include <linux/blkdev.h>
	14	#include <linux/spinlock.h>
f85221dd	15	#include <linux/mutex.h>
607ca46e	16	#include <uapi/linux/loop.h>
1da177e4 LT	17
	18	/* Possible states of device */
	19	enum {
	20	Lo_unbound,
	21	Lo_bound,
	22	Lo_rundown,
	23	};
	24
	25	struct loop_func_table;
	26
	27	struct loop_device {
	28	int lo_number;
	29	int lo_refcnt;
	30	loff_t lo_offset;
	31	loff_t lo_sizelimit;
	32	int lo_flags;
	33	int (transfer)(struct loop_device , int cmd,
	34	struct page *raw_page, unsigned raw_off,
	35	struct page *loop_page, unsigned loop_off,
	36	int size, sector_t real_block);
	37	char lo_file_name[LO_NAME_SIZE];
	38	char lo_crypt_name[LO_NAME_SIZE];
	39	char lo_encrypt_key[LO_KEY_SIZE];
	40	int lo_encrypt_key_size;
	41	struct loop_func_table *lo_encryption;
	42	__u32 lo_init[2];
e4849737	43	kuid_t lo_key_owner; /* Who set the key */
1da177e4 LT	44	int (ioctl)(struct loop_device , int cmd,
	45	unsigned long arg);
	46
	47	struct file * lo_backing_file;
	48	struct block_device *lo_device;
	49	unsigned lo_blocksize;
	50	void *key_data;
	51
b4e3ca1a	52	gfp_t old_gfp_mask;
1da177e4 LT	53
1da177e4 LT	54	spinlock_t lo_lock;
e686307f	55	struct bio_list lo_bio_list;
7b5a3522	56	unsigned int lo_bio_count;
1da177e4	57	int lo_state;
f85221dd	58	struct mutex lo_ctl_mutex;
6c997918 SH	59	struct task_struct *lo_thread;
6c997918 SH	60	wait_queue_head_t lo_event;
7b5a3522 LC	61	/* wait queue for incoming requests */
7b5a3522 LC	62	wait_queue_head_t lo_req_wait;
1da177e4	63
01e457cf	64	struct request_queue *lo_queue;
73285082	65	struct gendisk *lo_disk;
1da177e4 LT	66	};
1da177e4 LT	67
1da177e4 LT	68	/* Support for loadable transfer modules */
	69	struct loop_func_table {
	70	int number; /* filter type */
	71	int (transfer)(struct loop_device lo, int cmd,
	72	struct page *raw_page, unsigned raw_off,
	73	struct page *loop_page, unsigned loop_off,
	74	int size, sector_t real_block);
	75	int (init)(struct loop_device , const struct loop_info64 *);
	76	/* release is called from loop_unregister_transfer or clr_fd */
	77	int (release)(struct loop_device );
	78	int (ioctl)(struct loop_device , int cmd, unsigned long arg);
	79	struct module *owner;
	80	};
	81
	82	int loop_register_transfer(struct loop_func_table *funcs);
	83	int loop_unregister_transfer(int number);
	84
	85	#endif