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Current File : /usr/src/kernels/3.10.0-1160.76.1.el7.x86_64/include/linux/zpool.h
/*
 * zpool memory storage api
 *
 * Copyright (C) 2014 Dan Streetman
 *
 * This is a common frontend for the zbud and zsmalloc memory
 * storage pool implementations.  Typically, this is used to
 * store compressed memory.
 */

#ifndef _ZPOOL_H_
#define _ZPOOL_H_

struct zpool;

struct zpool_ops {
	int (*evict)(struct zpool *pool, unsigned long handle);
};

/*
 * Control how a handle is mapped.  It will be ignored if the
 * implementation does not support it.  Its use is optional.
 * Note that this does not refer to memory protection, it
 * refers to how the memory will be copied in/out if copying
 * is necessary during mapping; read-write is the safest as
 * it copies the existing memory in on map, and copies the
 * changed memory back out on unmap.  Write-only does not copy
 * in the memory and should only be used for initialization.
 * If in doubt, use ZPOOL_MM_DEFAULT which is read-write.
 */
enum zpool_mapmode {
	ZPOOL_MM_RW, /* normal read-write mapping */
	ZPOOL_MM_RO, /* read-only (no copy-out at unmap time) */
	ZPOOL_MM_WO, /* write-only (no copy-in at map time) */

	ZPOOL_MM_DEFAULT = ZPOOL_MM_RW
};

struct zpool *zpool_create_pool(char *type, char *name,
			gfp_t gfp, struct zpool_ops *ops);

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);

int zpool_shrink(struct zpool *pool, unsigned int pages,
			unsigned int *reclaimed);

void *zpool_map_handle(struct zpool *pool, unsigned long handle,
			enum zpool_mapmode mm);

void zpool_unmap_handle(struct zpool *pool, unsigned long handle);

u64 zpool_get_total_size(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.
 * @shrink:	shrink the pool.
 * @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)(char *name, gfp_t gfp, struct zpool_ops *ops);
	void (*destroy)(void *pool);

	int (*malloc)(void *pool, size_t size, gfp_t gfp,
				unsigned long *handle);
	void (*free)(void *pool, unsigned long handle);

	int (*shrink)(void *pool, unsigned int pages,
				unsigned int *reclaimed);

	void *(*map)(void *pool, unsigned long handle,
				enum zpool_mapmode mm);
	void (*unmap)(void *pool, unsigned long handle);

	u64 (*total_size)(void *pool);
};

void zpool_register_driver(struct zpool_driver *driver);

int zpool_unregister_driver(struct zpool_driver *driver);

int zpool_evict(void *pool, unsigned long handle);

#endif

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