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/* SPDX-License-Identifier: GPL-2.0 */
/*
* zpool memory storage api
*
* Copyright (C) 2014 Dan Streetman
*
* This is a common frontend for the zswap compressed memory storage
* implementations.
*/
#ifndef _ZPOOL_H_
#define _ZPOOL_H_
struct zpool;
bool zpool_has_pool(char *type);
struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp);
const char *zpool_get_type(struct zpool *pool);
void zpool_destroy_pool(struct zpool *pool);
int zpool_malloc(struct zpool *pool, size_t size, gfp_t gfp,
unsigned long *handle);
void zpool_free(struct zpool *pool, unsigned long handle);
void *zpool_obj_read_begin(struct zpool *zpool, unsigned long handle,
void *local_copy);
void zpool_obj_read_end(struct zpool *zpool, unsigned long handle,
void *handle_mem);
void zpool_obj_write(struct zpool *zpool, unsigned long handle,
void *handle_mem, size_t mem_len);
u64 zpool_get_total_pages(struct zpool *pool);
/**
* struct zpool_driver - driver implementation for zpool
* @type: name of the driver.
* @list: entry in the list of zpool drivers.
* @create: create a new pool.
* @destroy: destroy a pool.
* @malloc: allocate mem from a pool.
* @free: free mem from a pool.
* @sleep_mapped: whether zpool driver can sleep during map.
* @map: map a handle.
* @unmap: unmap a handle.
* @total_size: get total size of a pool.
*
* This is created by a zpool implementation and registered
* with zpool.
*/
struct zpool_driver {
char *type;
struct module *owner;
atomic_t refcount;
struct list_head list;
void *(*create)(const char *name, gfp_t gfp);
void (*destroy)(void *pool);
int (*malloc)(void *pool, size_t size, gfp_t gfp,
unsigned long *handle);
void (*free)(void *pool, unsigned long handle);
void *(*obj_read_begin)(void *pool, unsigned long handle,
void *local_copy);
void (*obj_read_end)(void *pool, unsigned long handle,
void *handle_mem);
void (*obj_write)(void *pool, unsigned long handle,
void *handle_mem, size_t mem_len);
u64 (*total_pages)(void *pool);
};
void zpool_register_driver(struct zpool_driver *driver);
int zpool_unregister_driver(struct zpool_driver *driver);
bool zpool_can_sleep_mapped(struct zpool *pool);
#endif
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