static dm_cblock_t smq_residency(struct dm_cache_policy *p)
{
dm_cblock_t r;
struct smq_policy *mq = to_smq_policy(p);
mutex_lock(&mq->lock);
r = to_cblock(mq->cache_alloc.nr_allocated);
mutex_unlock(&mq->lock);
return r;
}
static dm_cblock_t smq_residency(struct dm_cache_policy *p)
{
dm_cblock_t r;
unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
spin_lock_irqsave(&mq->lock, flags);
r = to_cblock(mq->cache_alloc.nr_allocated);
spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
/*
* Fills result out with a cache block that isn't in use, or return
* -ENOSPC. This does _not_ mark the cblock as allocated, the caller is
* reponsible for that.
*/
static int __find_free_cblock(struct mq_policy *mq, unsigned begin, unsigned end,
dm_cblock_t *result, unsigned *last_word)
{
int r = -ENOSPC;
unsigned w;
for (w = begin; w < end; w++) {
/*
* ffz is undefined if no zero exists
*/
if (mq->allocation_bitset[w] != ~0UL) {
*last_word = w;
*result = to_cblock((w * BITS_PER_LONG) + ffz(mq->allocation_bitset[w]));
if (from_cblock(*result) < from_cblock(mq->cache_size))
r = 0;
break;
}
}
return r;
}
static dm_cblock_t infer_cblock(struct entry_pool *ep, struct entry *e)
{
return to_cblock(e - ep->entries);
}
static dm_cblock_t infer_cblock(struct smq_policy *mq, struct entry *e)
{
return to_cblock(get_index(&mq->cache_alloc, e));
}
