Import ipset-2.3.1a-20080617

extensions/ipset/ip_set_malloc.h

@@ -0,0 +1,143 @@
+#ifndef _IP_SET_MALLOC_H
+#define _IP_SET_MALLOC_H
+
+#ifdef __KERNEL__
+
+static size_t max_malloc_size = 0, max_page_size = 0;
+
+static inline bool init_max_page_size(void)
+{
+	size_t page_size = 0;
+	
+#define CACHE(x) if (max_page_size == 0 || x < max_page_size)	\
+			page_size = x;
+#include <linux/kmalloc_sizes.h>
+#undef CACHE
+	if (page_size) {
+		if (max_malloc_size == 0)
+			max_malloc_size = page_size;
+
+		max_page_size = page_size;
+
+		return 1;
+	}
+	return 0;
+}
+
+struct harray {
+	size_t max_elements;
+	void *arrays[0];
+};
+
+static inline void * 
+__harray_malloc(size_t hashsize, size_t typesize, int flags)
+{
+	struct harray *harray;
+	size_t max_elements, size, i, j;
+
+	BUG_ON(max_page_size == 0);
+
+	if (typesize > max_page_size)
+		return NULL;
+
+	max_elements = max_page_size/typesize;
+	size = hashsize/max_elements;
+	if (hashsize % max_elements)
+		size++;
+	
+	/* Last pointer signals end of arrays */
+	harray = kmalloc(sizeof(struct harray) + (size + 1) * sizeof(void *),
+			 flags);
+
+	if (!harray)
+		return NULL;
+	
+	for (i = 0; i < size - 1; i++) {
+		harray->arrays[i] = kmalloc(max_elements * typesize, flags);
+		if (!harray->arrays[i])
+			goto undo;
+		memset(harray->arrays[i], 0, max_elements * typesize);
+	}
+	harray->arrays[i] = kmalloc((hashsize - i * max_elements) * typesize, 
+				    flags);
+	if (!harray->arrays[i])
+		goto undo;
+	memset(harray->arrays[i], 0, (hashsize - i * max_elements) * typesize);
+
+	harray->max_elements = max_elements;
+	harray->arrays[size] = NULL;
+	
+	return (void *)harray;
+
+    undo:
+    	for (j = 0; j < i; j++) {
+    		kfree(harray->arrays[j]);
+    	}
+    	kfree(harray);
+    	return NULL;
+}
+
+static inline void *
+harray_malloc(size_t hashsize, size_t typesize, int flags)
+{
+	void *harray;
+	
+	do {
+		harray = __harray_malloc(hashsize, typesize, flags|__GFP_NOWARN);
+	} while (harray == NULL && init_max_page_size());
+	
+	return harray;
+}		
+
+static inline void harray_free(void *h)
+{
+	struct harray *harray = (struct harray *) h;
+	size_t i;
+	
+    	for (i = 0; harray->arrays[i] != NULL; i++)
+    		kfree(harray->arrays[i]);
+    	kfree(harray);
+}
+
+static inline void harray_flush(void *h, size_t hashsize, size_t typesize)
+{
+	struct harray *harray = (struct harray *) h;
+	size_t i;
+	
+    	for (i = 0; harray->arrays[i+1] != NULL; i++)
+		memset(harray->arrays[i], 0, harray->max_elements * typesize);
+	memset(harray->arrays[i], 0, 
+	       (hashsize - i * harray->max_elements) * typesize);
+}
+
+#define HARRAY_ELEM(h, type, which)				\
+({								\
+	struct harray *__h = (struct harray *)(h);		\
+	((type)((__h)->arrays[(which)/(__h)->max_elements])	\
+		+ (which)%(__h)->max_elements);			\
+})
+
+/* General memory allocation and deallocation */
+static inline void * ip_set_malloc(size_t bytes)
+{
+	BUG_ON(max_malloc_size == 0);
+
+	if (bytes > max_malloc_size)
+		return vmalloc(bytes);
+	else
+		return kmalloc(bytes, GFP_KERNEL | __GFP_NOWARN);
+}
+
+static inline void ip_set_free(void * data, size_t bytes)
+{
+	BUG_ON(max_malloc_size == 0);
+
+	if (bytes > max_malloc_size)
+		vfree(data);
+	else
+		kfree(data);
+}
+
+#endif				/* __KERNEL__ */
+
+#endif /*_IP_SET_MALLOC_H*/