--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/mempool.h	Sun Jan 11 20:20:11 2009 +0100
@@ -0,0 +1,79 @@
+/*
+ * memory buffer pool support
+ */
+#ifndef _LINUX_MEMPOOL_H
+#define _LINUX_MEMPOOL_H
+
+#include <linux/wait.h>
+
+struct kmem_cache;
+
+typedef void * (mempool_alloc_t)(gfp_t 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 mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
+			mempool_free_t *free_fn, void *pool_data, int nid);
+
+extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
+extern void mempool_destroy(mempool_t *pool);
+extern void * mempool_alloc(mempool_t *pool, gfp_t 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(gfp_t gfp_mask, void *pool_data);
+void mempool_free_slab(void *element, void *pool_data);
+static inline mempool_t *
+mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
+{
+	return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
+			      (void *) kc);
+}
+
+/*
+ * 2 mempool_alloc_t's and a mempool_free_t to kmalloc/kzalloc and kfree
+ * the amount of memory specified by pool_data
+ */
+void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
+void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data);
+void mempool_kfree(void *element, void *pool_data);
+static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
+{
+	return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
+			      (void *) size);
+}
+static inline mempool_t *mempool_create_kzalloc_pool(int min_nr, size_t size)
+{
+	return mempool_create(min_nr, mempool_kzalloc, mempool_kfree,
+			      (void *) size);
+}
+
+/*
+ * A mempool_alloc_t and mempool_free_t for a simple page allocator that
+ * allocates pages of the order specified by pool_data
+ */
+void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
+void mempool_free_pages(void *element, void *pool_data);
+static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
+{
+	return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
+			      (void *)(long)order);
+}
+
+#endif /* _LINUX_MEMPOOL_H */