| #ifndef _FLEX_ARRAY_H |
| #define _FLEX_ARRAY_H |
| |
| #include <linux/types.h> |
| #include <asm/page.h> |
| |
| #define FLEX_ARRAY_PART_SIZE PAGE_SIZE |
| #define FLEX_ARRAY_BASE_SIZE PAGE_SIZE |
| |
| struct flex_array_part; |
| |
| /* |
| * This is meant to replace cases where an array-like |
| * structure has gotten too big to fit into kmalloc() |
| * and the developer is getting tempted to use |
| * vmalloc(). |
| */ |
| |
| struct flex_array { |
| union { |
| struct { |
| int element_size; |
| int total_nr_elements; |
| struct flex_array_part *parts[]; |
| }; |
| /* |
| * This little trick makes sure that |
| * sizeof(flex_array) == PAGE_SIZE |
| */ |
| char padding[FLEX_ARRAY_BASE_SIZE]; |
| }; |
| }; |
| |
| #define FLEX_ARRAY_INIT(size, total) { { {\ |
| .element_size = (size), \ |
| .total_nr_elements = (total), \ |
| } } } |
| |
| struct flex_array *flex_array_alloc(int element_size, unsigned int total, |
| gfp_t flags); |
| int flex_array_prealloc(struct flex_array *fa, unsigned int start, |
| unsigned int end, gfp_t flags); |
| void flex_array_free(struct flex_array *fa); |
| void flex_array_free_parts(struct flex_array *fa); |
| int flex_array_put(struct flex_array *fa, unsigned int element_nr, void *src, |
| gfp_t flags); |
| int flex_array_clear(struct flex_array *fa, unsigned int element_nr); |
| void *flex_array_get(struct flex_array *fa, unsigned int element_nr); |
| |
| #endif /* _FLEX_ARRAY_H */ |