/* SPDX-License-Identifier: GPL-2.0 */
/*
* loop_main.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_XLOOP_H
#define _LINUX_XLOOP_H
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include "uapi_xloop.h"
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
#endif
#include "xloop_file_fmt.h"
/* Possible states of device */
enum {
Xlo_unbound,
Xlo_bound,
Xlo_rundown,
Xlo_deleting,
};
struct xloop_func_table;
struct xloop_device {
int xlo_number;
atomic_t xlo_refcnt;
loff_t xlo_offset;
loff_t xlo_sizelimit;
int xlo_flags;
int (*transfer)(struct xloop_device *xlo, int cmd, struct page *raw_page, unsigned raw_off, struct page *xloop_page, unsigned xloop_off, int size, sector_t real_block);
char xlo_file_name[XLO_NAME_SIZE];
char xlo_crypt_name[XLO_NAME_SIZE];
char xlo_encrypt_key[XLO_KEY_SIZE];
int xlo_encrypt_key_size;
struct xloop_func_table *xlo_encryption;
__u32 xlo_init[2];
kuid_t xlo_key_owner; /* Who set the key */
int (*ioctl)(struct xloop_device *xlo, int cmd, unsigned long arg);
struct xloop_file_fmt *xlo_fmt;
struct file *xlo_backing_file;
struct block_device *xlo_device;
void *key_data;
gfp_t old_gfp_mask;
spinlock_t xlo_lock;
int xlo_state;
spinlock_t xlo_work_lock;
struct workqueue_struct *workqueue;
struct work_struct rootcg_work;
struct list_head rootcg_cmd_list;
struct list_head idle_worker_list;
struct rb_root worker_tree;
struct timer_list timer;
bool use_dio;
bool sysfs_inited;
struct request_queue *xlo_queue;
struct blk_mq_tag_set tag_set;
struct gendisk *xlo_disk;
struct mutex xlo_mutex;
bool idr_visible;
#ifdef CONFIG_DEBUG_FS
struct dentry *xlo_dbgfs_dir;
#endif
};
struct xloop_cmd {
struct list_head list_entry;
bool use_aio; /* use AIO interface to handle I/O */
atomic_t ref; /* only for aio */
long ret;
struct kiocb iocb;
struct bio_vec *bvec;
struct cgroup_subsys_state *blkcg_css;
struct cgroup_subsys_state *memcg_css;
};
/* Support for loadable transfer modules */
struct xloop_func_table {
int number; /* filter type */
int (*transfer)(struct xloop_device *xlo, int cmd, struct page *raw_page, unsigned raw_off, struct page *xloop_page, unsigned xloop_off, int size, sector_t real_block);
int (*init)(struct xloop_device *xlo, const struct xloop_info64 *info);
/* release is called from xloop_unregister_transfer or clr_fd */
int (*release)(struct xloop_device *xlo);
int (*ioctl)(struct xloop_device *xlo, int cmd, unsigned long arg);
struct module *owner;
};
extern inline struct device *xloop_device_to_dev(struct xloop_device *xlo);
int xloop_register_transfer(struct xloop_func_table *funcs);
int xloop_unregister_transfer(int number);
#endif
