include/linux/mempool.h

   1 /*
   2  * memory buffer pool support
   3  */
   4 #ifndef _LINUX_MEMPOOL_H
   5 #define _LINUX_MEMPOOL_H
   6
   7 #include <linux/wait.h>
   8
   9 typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
  10 typedef void (mempool_free_t)(void *element, void *pool_data);
  11
  12 typedef 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;
  23
  24 extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
  25                         mempool_free_t *free_fn, void *pool_data);
  26 extern 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
  29 extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
  30 extern void mempool_destroy(mempool_t *pool);
  31 extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
  32 extern 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  */
  38 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
  39 void mempool_free_slab(void *element, void *pool_data);
  40
  41 #endif /* _LINUX_MEMPOOL_H */