static void smq_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock)
{
struct smq_policy *mq = to_smq_policy(p);
mutex_lock(&mq->lock);
__remove_mapping(mq, oblock);
mutex_unlock(&mq->lock);
}
static void smq_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
{
struct smq_policy *mq = to_smq_policy(p);
mutex_lock(&mq->lock);
__smq_set_clear_dirty(mq, oblock, false);
mutex_unlock(&mq->lock);
}
static void smq_clear_dirty(struct dm_cache_policy *p, dm_oblock_t oblock)
{
struct smq_policy *mq = to_smq_policy(p);
unsigned long flags;
spin_lock_irqsave(&mq->lock, flags);
__smq_set_clear_dirty(mq, oblock, false);
spin_unlock_irqrestore(&mq->lock, flags);
}
static void smq_force_mapping(struct dm_cache_policy *p,
dm_oblock_t current_oblock, dm_oblock_t new_oblock)
{
struct smq_policy *mq = to_smq_policy(p);
mutex_lock(&mq->lock);
__force_mapping(mq, current_oblock, new_oblock);
mutex_unlock(&mq->lock);
}
static void smq_remove_mapping(struct dm_cache_policy *p, dm_oblock_t oblock)
{
struct smq_policy *mq = to_smq_policy(p);
unsigned long flags;
spin_lock_irqsave(&mq->lock, flags);
__remove_mapping(mq, oblock);
spin_unlock_irqrestore(&mq->lock, flags);
}
static void smq_force_mapping(struct dm_cache_policy *p,
dm_oblock_t current_oblock, dm_oblock_t new_oblock)
{
unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
spin_lock_irqsave(&mq->lock, flags);
__force_mapping(mq, current_oblock, new_oblock);
spin_unlock_irqrestore(&mq->lock, flags);
}
static void smq_destroy(struct dm_cache_policy *p)
{
struct smq_policy *mq = to_smq_policy(p);
h_exit(&mq->hotspot_table);
h_exit(&mq->table);
free_bitset(mq->hotspot_hit_bits);
free_bitset(mq->cache_hit_bits);
space_exit(&mq->es);
kfree(mq);
}
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 int smq_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock)
{
int r;
struct smq_policy *mq = to_smq_policy(p);
mutex_lock(&mq->lock);
r = __remove_cblock(mq, cblock);
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;
}
static int smq_writeback_work(struct dm_cache_policy *p, dm_oblock_t *oblock,
dm_cblock_t *cblock, bool critical_only)
{
int r;
struct smq_policy *mq = to_smq_policy(p);
mutex_lock(&mq->lock);
r = __smq_writeback_work(mq, oblock, cblock, critical_only);
mutex_unlock(&mq->lock);
return r;
}
static int smq_remove_cblock(struct dm_cache_policy *p, dm_cblock_t cblock)
{
int r;
unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
spin_lock_irqsave(&mq->lock, flags);
r = __remove_cblock(mq, cblock);
spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
static void smq_tick(struct dm_cache_policy *p, bool can_block)
{
struct smq_policy *mq = to_smq_policy(p);
unsigned long flags;
spin_lock_irqsave(&mq->lock, flags);
mq->tick++;
update_sentinels(mq);
end_hotspot_period(mq);
end_cache_period(mq);
spin_unlock_irqrestore(&mq->lock, flags);
}
static int smq_writeback_work(struct dm_cache_policy *p, dm_oblock_t *oblock,
dm_cblock_t *cblock, bool critical_only)
{
int r;
unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
spin_lock_irqsave(&mq->lock, flags);
r = __smq_writeback_work(mq, oblock, cblock, critical_only);
spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
static void smq_tick(struct dm_cache_policy *p, bool can_block)
{
struct smq_policy *mq = to_smq_policy(p);
unsigned long flags;
spin_lock_irqsave(&mq->tick_lock, flags);
mq->tick_protected++;
spin_unlock_irqrestore(&mq->tick_lock, flags);
if (can_block) {
mutex_lock(&mq->lock);
copy_tick(mq);
mutex_unlock(&mq->lock);
}
}
static int smq_load_mapping(struct dm_cache_policy *p,
dm_oblock_t oblock, dm_cblock_t cblock,
uint32_t hint, bool hint_valid)
{
struct smq_policy *mq = to_smq_policy(p);
struct entry *e;
e = alloc_particular_entry(&mq->cache_alloc, from_cblock(cblock));
e->oblock = oblock;
e->dirty = false; /* this gets corrected in a minute */
e->level = hint_valid ? min(hint, NR_CACHE_LEVELS - 1) : 1;
push(mq, e);
return 0;
}
static int smq_walk_mappings(struct dm_cache_policy *p, policy_walk_fn fn,
void *context)
{
struct smq_policy *mq = to_smq_policy(p);
int r = 0;
mutex_lock(&mq->lock);
r = smq_save_hints(mq, &mq->clean, fn, context);
if (!r)
r = smq_save_hints(mq, &mq->dirty, fn, context);
mutex_unlock(&mq->lock);
return r;
}
static int smq_walk_mappings(struct dm_cache_policy *p, policy_walk_fn fn,
void *context)
{
struct smq_policy *mq = to_smq_policy(p);
int r = 0;
/*
* We don't need to lock here since this method is only called once
* the IO has stopped.
*/
r = smq_save_hints(mq, &mq->clean, fn, context);
if (!r)
r = smq_save_hints(mq, &mq->dirty, fn, context);
return r;
}
static int smq_map(struct dm_cache_policy *p, dm_oblock_t oblock,
bool can_block, bool can_migrate, bool fast_promote,
struct bio *bio, struct policy_locker *locker,
struct policy_result *result)
{
int r;
unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
result->op = POLICY_MISS;
spin_lock_irqsave(&mq->lock, flags);
r = map(mq, bio, oblock, can_migrate, fast_promote, locker, result);
spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
static int smq_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock)
{
int r;
unsigned long flags;
struct smq_policy *mq = to_smq_policy(p);
struct entry *e;
spin_lock_irqsave(&mq->lock, flags);
e = h_lookup(&mq->table, oblock);
if (e) {
*cblock = infer_cblock(mq, e);
r = 0;
} else
r = -ENOENT;
spin_unlock_irqrestore(&mq->lock, flags);
return r;
}
static int smq_map(struct dm_cache_policy *p, dm_oblock_t oblock,
bool can_block, bool can_migrate, bool fast_promote,
struct bio *bio, struct policy_locker *locker,
struct policy_result *result)
{
int r;
struct smq_policy *mq = to_smq_policy(p);
result->op = POLICY_MISS;
if (!maybe_lock(mq, can_block))
return -EWOULDBLOCK;
copy_tick(mq);
r = map(mq, bio, oblock, can_migrate, fast_promote, locker, result);
mutex_unlock(&mq->lock);
return r;
}
static int smq_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock)
{
int r;
struct smq_policy *mq = to_smq_policy(p);
struct entry *e;
if (!mutex_trylock(&mq->lock))
return -EWOULDBLOCK;
e = h_lookup(&mq->table, oblock);
if (e) {
*cblock = infer_cblock(mq, e);
r = 0;
} else
r = -ENOENT;
mutex_unlock(&mq->lock);
return r;
}
