X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=include%2Flinux%2Fmempool.h;h=506da24d6d594f8d6dbd0f66052d2bfd497f3d09;hb=ddac1641ee1e2686c2211a8d671ea723634dfc89;hp=ddf6f94130afa11bf40819986d04f38ba11e4af4;hpb=a5b5eba7f788bb77cf57f9c94f3474a2d439ab0b;p=bcachefs-tools-debian

diff --git a/include/linux/mempool.h b/include/linux/mempool.h
index ddf6f94..506da24 100644
--- a/include/linux/mempool.h
+++ b/include/linux/mempool.h
@@ -1,83 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * memory buffer pool support
  */
 #ifndef _LINUX_MEMPOOL_H
 #define _LINUX_MEMPOOL_H
 
+#include <linux/wait.h>
 #include <linux/compiler.h>
-#include <linux/bug.h>
 #include <linux/slab.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 {
-	size_t		elem_size;
+	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;
 
 static inline bool mempool_initialized(mempool_t *pool)
 {
-	return true;
+	return pool->elements != NULL;
 }
 
-extern int mempool_resize(mempool_t *pool, int new_min_nr);
+void mempool_exit(mempool_t *pool);
+int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
+		      mempool_free_t *free_fn, void *pool_data,
+		      gfp_t gfp_mask, int node_id);
+int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
+		 mempool_free_t *free_fn, void *pool_data);
 
-static inline void mempool_free(void *element, mempool_t *pool)
-{
-	free(element);
-}
+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,
+			gfp_t gfp_mask, int nid);
 
-static inline void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc
-{
-	BUG_ON(!pool->elem_size);
-	return kmalloc(pool->elem_size, gfp_mask);
-}
-
-static inline void mempool_exit(mempool_t *pool) {}
+extern int mempool_resize(mempool_t *pool, int new_min_nr);
+extern void mempool_destroy(mempool_t *pool);
+extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc;
+extern void mempool_free(void *element, mempool_t *pool);
 
-static inline void mempool_destroy(mempool_t *pool)
-{
-	free(pool);
-}
+/*
+ * A mempool_alloc_t and mempool_free_t that get the memory from
+ * a slab cache that is passed in through pool_data.
+ * Note: the slab cache may not have a ctor function.
+ */
+void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
+void mempool_free_slab(void *element, void *pool_data);
 
 static inline int
 mempool_init_slab_pool(mempool_t *pool, int min_nr, struct kmem_cache *kc)
 {
-	pool->elem_size = 0;
-	return 0;
+	return mempool_init(pool, min_nr, mempool_alloc_slab,
+			    mempool_free_slab, (void *) kc);
 }
 
 static inline mempool_t *
 mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
 {
-	mempool_t *pool = malloc(sizeof(*pool));
-	pool->elem_size = 0;
-	return pool;
+	return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
+			      (void *) kc);
 }
 
+/*
+ * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
+ * amount of memory specified by pool_data
+ */
+void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
+void mempool_kfree(void *element, void *pool_data);
+
 static inline int mempool_init_kmalloc_pool(mempool_t *pool, int min_nr, size_t size)
 {
-	pool->elem_size = size;
-	return 0;
+	return mempool_init(pool, min_nr, mempool_kmalloc,
+			    mempool_kfree, (void *) size);
 }
 
 static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
 {
-	mempool_t *pool = malloc(sizeof(*pool));
-	pool->elem_size = size;
-	return pool;
+	return mempool_create(min_nr, mempool_kmalloc, 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 int mempool_init_page_pool(mempool_t *pool, int min_nr, int order)
 {
-	pool->elem_size = PAGE_SIZE << order;
-	return 0;
+	return mempool_init(pool, min_nr, mempool_alloc_pages,
+			    mempool_free_pages, (void *)(long)order);
 }
 
 static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
 {
-	mempool_t *pool = malloc(sizeof(*pool));
-	pool->elem_size = PAGE_SIZE << order;
-	return pool;
+	return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
+			      (void *)(long)order);
 }
 
 #endif /* _LINUX_MEMPOOL_H */