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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * memory buffer pool support
3 */
4#ifndef _LINUX_MEMPOOL_H
5#define _LINUX_MEMPOOL_H
6
7#include <linux/wait.h>
8
Al Virodd0fc662005-10-07 07:46:04 +01009typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070010typedef void (mempool_free_t)(void *element, void *pool_data);
11
12typedef struct mempool_s {
13 spinlock_t lock;
14 int min_nr; /* nr of elements at *elements */
15 int curr_nr; /* Current nr of elements at *elements */
16 void **elements;
17
18 void *pool_data;
19 mempool_alloc_t *alloc;
20 mempool_free_t *free;
21 wait_queue_head_t wait;
22} mempool_t;
Christoph Lameter19460892005-06-23 00:08:19 -070023
24extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
25 mempool_free_t *free_fn, void *pool_data);
26extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
27 mempool_free_t *free_fn, void *pool_data, int nid);
28
Al Virodd0fc662005-10-07 07:46:04 +010029extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030extern void mempool_destroy(mempool_t *pool);
Al Virodd0fc662005-10-07 07:46:04 +010031extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032extern void mempool_free(void *element, mempool_t *pool);
33
34/*
35 * A mempool_alloc_t and mempool_free_t that get the memory from
36 * a slab that is passed in through pool_data.
37 */
Al Virodd0fc662005-10-07 07:46:04 +010038void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039void mempool_free_slab(void *element, void *pool_data);
40
41#endif /* _LINUX_MEMPOOL_H */