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/*
 * memory buffer pool support
 */
#ifndef _LINUX_MEMPOOL_H
#define _LINUX_MEMPOOL_H

#include <linux/wait.h>

typedef void * (mempool_alloc_t)(int gfp_mask, void *pool_data);
typedef void (mempool_free_t)(void *element, void *pool_data);

typedef struct mempool_s {
        spinlock_t lock;
        int min_nr;             /* nr of elements at *elements */
        int curr_nr;            /* Current nr of elements at *elements */
        void **elements;

        void *pool_data;
        mempool_alloc_t *alloc;
        mempool_free_t *free;
        wait_queue_head_t wait;
} mempool_t;
extern mempool_t * mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
                                 mempool_free_t *free_fn, void *pool_data);
extern int mempool_resize(mempool_t *pool, int new_min_nr, int gfp_mask);
extern void mempool_destroy(mempool_t *pool);
extern void * mempool_alloc(mempool_t *pool, int gfp_mask);
extern void mempool_free(void *element, mempool_t *pool);

/*
 * A mempool_alloc_t and mempool_free_t that get the memory from
 * a slab that is passed in through pool_data.
 */
void *mempool_alloc_slab(int gfp_mask, void *pool_data);
void mempool_free_slab(void *element, void *pool_data);

#endif /* _LINUX_MEMPOOL_H */