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#ifndef IOU_ALLOC_CACHE_H
#define IOU_ALLOC_CACHE_H
/*
* Don't allow the cache to grow beyond this size.
*/
#define IO_ALLOC_CACHE_MAX 512
struct io_cache_entry {
struct io_wq_work_node node;
};
static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
struct io_cache_entry *entry)
{
if (cache->nr_cached < cache->max_cached) {
cache->nr_cached++;
wq_stack_add_head(&entry->node, &cache->list);
/* KASAN poisons object */
kasan_slab_free_mempool(entry);
return true;
}
return false;
}
static inline bool io_alloc_cache_empty(struct io_alloc_cache *cache)
{
return !cache->list.next;
}
static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache)
{
if (cache->list.next) {
struct io_cache_entry *entry;
entry = container_of(cache->list.next, struct io_cache_entry, node);
kasan_unpoison_range(entry, cache->elem_size);
cache->list.next = cache->list.next->next;
cache->nr_cached--;
return entry;
}
return NULL;
}
static inline void io_alloc_cache_init(struct io_alloc_cache *cache,
unsigned max_nr, size_t size)
{
cache->list.next = NULL;
cache->nr_cached = 0;
cache->max_cached = max_nr;
cache->elem_size = size;
}
static inline void io_alloc_cache_free(struct io_alloc_cache *cache,
void (*free)(struct io_cache_entry *))
{
while (1) {
struct io_cache_entry *entry = io_alloc_cache_get(cache);
if (!entry)
break;
free(entry);
}
cache->nr_cached = 0;
}
#endif
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