1 #ifndef IOU_ALLOC_CACHE_H
2 #define IOU_ALLOC_CACHE_H
3
4 /*
5 * Don't allow the cache to grow beyond this size.
6 */
7 #define IO_ALLOC_CACHE_MAX 128
8
9 static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
10 void *entry)
11 {
12 if (cache->nr_cached < cache->max_cached) {
13 if (!kasan_mempool_poison_object(entry))
14 return false;
15 cache->entries[cache->nr_cached++] = entry;
16 return true;
17 }
18 return false;
19 }
20
21 static inline void *io_alloc_cache_get(struct io_alloc_cache *cache)
22 {
23 if (cache->nr_cached) {
24 void *entry = cache->entries[--cache->nr_cached];
25
26 kasan_mempool_unpoison_object(entry, cache->elem_size);
27 return entry;
28 }
29
30 return NULL;
31 }
32
33 /* returns false if the cache was initialized properly */
34 static inline bool io_alloc_cache_init(struct io_alloc_cache *cache,
35 unsigned max_nr, size_t size)
36 {
37 cache->entries = kvmalloc_array(max_nr, sizeof(void *), GFP_KERNEL);
38 if (cache->entries) {
39 cache->nr_cached = 0;
40 cache->max_cached = max_nr;
41 cache->elem_size = size;
42 return false;
43 }
44 return true;
45 }
46
47 static inline void io_alloc_cache_free(struct io_alloc_cache *cache,
48 void (*free)(const void *))
49 {
50 void *entry;
51
52 if (!cache->entries)
53 return;
54
55 while ((entry = io_alloc_cache_get(cache)) != NULL)
56 free(entry);
57
58 kvfree(cache->entries);
59 cache->entries = NULL;
60 }
61 #endif
62
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