Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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 512
8
9struct io_cache_entry {
10 struct hlist_node node;
11};
12
13static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
14 struct io_cache_entry *entry)
15{
16 if (cache->nr_cached < IO_ALLOC_CACHE_MAX) {
17 cache->nr_cached++;
18 hlist_add_head(&entry->node, &cache->list);
19 return true;
20 }
21 return false;
22}
23
24static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache)
25{
26 if (!hlist_empty(&cache->list)) {
27 struct hlist_node *node = cache->list.first;
28
29 hlist_del(node);
30 cache->nr_cached--;
31 return container_of(node, struct io_cache_entry, node);
32 }
33
34 return NULL;
35}
36
37static inline void io_alloc_cache_init(struct io_alloc_cache *cache)
38{
39 INIT_HLIST_HEAD(&cache->list);
40 cache->nr_cached = 0;
41}
42
43static inline void io_alloc_cache_free(struct io_alloc_cache *cache,
44 void (*free)(struct io_cache_entry *))
45{
46 while (!hlist_empty(&cache->list)) {
47 struct hlist_node *node = cache->list.first;
48
49 hlist_del(node);
50 free(container_of(node, struct io_cache_entry, node));
51 }
52 cache->nr_cached = 0;
53}
54#endif