1 #ifndef IOU_ALLOC_CACHE_H
2 #define IOU_ALLOC_CACHE_H
3
4 #include <linux/io_uring_types.h>
5
6 /*
7 * Don't allow the cache to grow beyond this size.
8 */
9 #define IO_ALLOC_CACHE_MAX 128
10
11 void io_alloc_cache_free(struct io_alloc_cache *cache,
12 void (*free)(const void *));
13 bool io_alloc_cache_init(struct io_alloc_cache *cache,
14 unsigned max_nr, unsigned int size,
15 unsigned int init_bytes);
16
17 void *io_cache_alloc_new(struct io_alloc_cache *cache, gfp_t gfp);
18
io_alloc_cache_kasan(struct iovec ** iov,int * nr)19 static inline void io_alloc_cache_kasan(struct iovec **iov, int *nr)
20 {
21 if (IS_ENABLED(CONFIG_KASAN)) {
22 kfree(*iov);
23 *iov = NULL;
24 *nr = 0;
25 }
26 }
27
io_alloc_cache_put(struct io_alloc_cache * cache,void * entry)28 static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
29 void *entry)
30 {
31 if (cache->nr_cached < cache->max_cached) {
32 if (!kasan_mempool_poison_object(entry))
33 return false;
34 cache->entries[cache->nr_cached++] = entry;
35 return true;
36 }
37 return false;
38 }
39
io_alloc_cache_get(struct io_alloc_cache * cache)40 static inline void *io_alloc_cache_get(struct io_alloc_cache *cache)
41 {
42 if (cache->nr_cached) {
43 void *entry = cache->entries[--cache->nr_cached];
44
45 /*
46 * If KASAN is enabled, always clear the initial bytes that
47 * must be zeroed post alloc, in case any of them overlap
48 * with KASAN storage.
49 */
50 #if defined(CONFIG_KASAN)
51 kasan_mempool_unpoison_object(entry, cache->elem_size);
52 if (cache->init_clear)
53 memset(entry, 0, cache->init_clear);
54 #endif
55 return entry;
56 }
57
58 return NULL;
59 }
60
io_cache_alloc(struct io_alloc_cache * cache,gfp_t gfp)61 static inline void *io_cache_alloc(struct io_alloc_cache *cache, gfp_t gfp)
62 {
63 void *obj;
64
65 obj = io_alloc_cache_get(cache);
66 if (obj)
67 return obj;
68 return io_cache_alloc_new(cache, gfp);
69 }
70
io_cache_free(struct io_alloc_cache * cache,void * obj)71 static inline void io_cache_free(struct io_alloc_cache *cache, void *obj)
72 {
73 if (!io_alloc_cache_put(cache, obj))
74 kfree(obj);
75 }
76
77 #endif
78