Quelle zpool.h Sprache: C

/* 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, const int nid);

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, const int nid);
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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