76 uint8_t bch_inc_gen(struct cache *ca, struct bucket *b)  in bch_inc_gen()  argument
80 	ca->set->need_gc = max(ca->set->need_gc, bucket_gc_gen(b));  in bch_inc_gen()
81 	WARN_ON_ONCE(ca->set->need_gc > BUCKET_GC_GEN_MAX);  in bch_inc_gen()
88 	struct cache *ca;  in bch_rescale_priorities()  local
107 	for_each_cache(ca, c, i)  in bch_rescale_priorities()
108 		for_each_bucket(b, ca)  in bch_rescale_priorities()
131 bool bch_can_invalidate_bucket(struct cache *ca, struct bucket *b)  in bch_can_invalidate_bucket()  argument
133 	BUG_ON(!ca->set->gc_mark_valid);  in bch_can_invalidate_bucket()
141 void __bch_invalidate_one_bucket(struct cache *ca, struct bucket *b)  in __bch_invalidate_one_bucket()  argument
143 	lockdep_assert_held(&ca->set->bucket_lock);  in __bch_invalidate_one_bucket()
147 		trace_bcache_invalidate(ca, b - ca->buckets);  in __bch_invalidate_one_bucket()
149 	bch_inc_gen(ca, b);  in __bch_invalidate_one_bucket()
154 static void bch_invalidate_one_bucket(struct cache *ca, struct bucket *b)  in bch_invalidate_one_bucket()  argument
156 	__bch_invalidate_one_bucket(ca, b);  in bch_invalidate_one_bucket()
158 	fifo_push(&ca->free_inc, b - ca->buckets);  in bch_invalidate_one_bucket()
172 	unsigned int min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8;	\
174 	(b->prio - ca->set->min_prio + min_prio) * GC_SECTORS_USED(b);	\
180 static void invalidate_buckets_lru(struct cache *ca)  in invalidate_buckets_lru()  argument
185 	ca->heap.used = 0;  in invalidate_buckets_lru()
187 	for_each_bucket(b, ca) {  in invalidate_buckets_lru()
188 		if (!bch_can_invalidate_bucket(ca, b))  in invalidate_buckets_lru()
191 		if (!heap_full(&ca->heap))  in invalidate_buckets_lru()
192 			heap_add(&ca->heap, b, bucket_max_cmp);  in invalidate_buckets_lru()
193 		else if (bucket_max_cmp(b, heap_peek(&ca->heap))) {  in invalidate_buckets_lru()
194 			ca->heap.data[0] = b;  in invalidate_buckets_lru()
195 			heap_sift(&ca->heap, 0, bucket_max_cmp);  in invalidate_buckets_lru()
199 	for (i = ca->heap.used / 2 - 1; i >= 0; --i)  in invalidate_buckets_lru()
200 		heap_sift(&ca->heap, i, bucket_min_cmp);  in invalidate_buckets_lru()
202 	while (!fifo_full(&ca->free_inc)) {  in invalidate_buckets_lru()
203 		if (!heap_pop(&ca->heap, b, bucket_min_cmp)) {  in invalidate_buckets_lru()
208 			ca->invalidate_needs_gc = 1;  in invalidate_buckets_lru()
209 			wake_up_gc(ca->set);  in invalidate_buckets_lru()
213 		bch_invalidate_one_bucket(ca, b);  in invalidate_buckets_lru()
217 static void invalidate_buckets_fifo(struct cache *ca)  in invalidate_buckets_fifo()  argument
222 	while (!fifo_full(&ca->free_inc)) {  in invalidate_buckets_fifo()
223 		if (ca->fifo_last_bucket <  ca->sb.first_bucket ||  in invalidate_buckets_fifo()
224 		    ca->fifo_last_bucket >= ca->sb.nbuckets)  in invalidate_buckets_fifo()
225 			ca->fifo_last_bucket = ca->sb.first_bucket;  in invalidate_buckets_fifo()
227 		b = ca->buckets + ca->fifo_last_bucket++;  in invalidate_buckets_fifo()
229 		if (bch_can_invalidate_bucket(ca, b))  in invalidate_buckets_fifo()
230 			bch_invalidate_one_bucket(ca, b);  in invalidate_buckets_fifo()
232 		if (++checked >= ca->sb.nbuckets) {  in invalidate_buckets_fifo()
233 			ca->invalidate_needs_gc = 1;  in invalidate_buckets_fifo()
234 			wake_up_gc(ca->set);  in invalidate_buckets_fifo()
240 static void invalidate_buckets_random(struct cache *ca)  in invalidate_buckets_random()  argument
245 	while (!fifo_full(&ca->free_inc)) {  in invalidate_buckets_random()
250 		n %= (size_t) (ca->sb.nbuckets - ca->sb.first_bucket);  in invalidate_buckets_random()
251 		n += ca->sb.first_bucket;  in invalidate_buckets_random()
253 		b = ca->buckets + n;  in invalidate_buckets_random()
255 		if (bch_can_invalidate_bucket(ca, b))  in invalidate_buckets_random()
256 			bch_invalidate_one_bucket(ca, b);  in invalidate_buckets_random()
258 		if (++checked >= ca->sb.nbuckets / 2) {  in invalidate_buckets_random()
259 			ca->invalidate_needs_gc = 1;  in invalidate_buckets_random()
260 			wake_up_gc(ca->set);  in invalidate_buckets_random()
266 static void invalidate_buckets(struct cache *ca)  in invalidate_buckets()  argument
268 	BUG_ON(ca->invalidate_needs_gc);  in invalidate_buckets()
270 	switch (CACHE_REPLACEMENT(&ca->sb)) {  in invalidate_buckets()
272 		invalidate_buckets_lru(ca);  in invalidate_buckets()
275 		invalidate_buckets_fifo(ca);  in invalidate_buckets()
278 		invalidate_buckets_random(ca);  in invalidate_buckets()
283 #define allocator_wait(ca, cond)					\  argument
290 		mutex_unlock(&(ca)->set->bucket_lock);			\
292 		    test_bit(CACHE_SET_IO_DISABLE, &ca->set->flags)) {	\
298 		mutex_lock(&(ca)->set->bucket_lock);			\
303 static int bch_allocator_push(struct cache *ca, long bucket)  in bch_allocator_push()  argument
308 	if (fifo_push(&ca->free[RESERVE_PRIO], bucket))  in bch_allocator_push()
312 		if (fifo_push(&ca->free[i], bucket))  in bch_allocator_push()
320 	struct cache *ca = arg;  in bch_allocator_thread()  local
322 	mutex_lock(&ca->set->bucket_lock);  in bch_allocator_thread()
333 			if (!fifo_pop(&ca->free_inc, bucket))  in bch_allocator_thread()
336 			if (ca->discard) {  in bch_allocator_thread()
337 				mutex_unlock(&ca->set->bucket_lock);  in bch_allocator_thread()
338 				blkdev_issue_discard(ca->bdev,  in bch_allocator_thread()
339 					bucket_to_sector(ca->set, bucket),  in bch_allocator_thread()
340 					ca->sb.bucket_size, GFP_KERNEL, 0);  in bch_allocator_thread()
341 				mutex_lock(&ca->set->bucket_lock);  in bch_allocator_thread()
344 			allocator_wait(ca, bch_allocator_push(ca, bucket));  in bch_allocator_thread()
345 			wake_up(&ca->set->btree_cache_wait);  in bch_allocator_thread()
346 			wake_up(&ca->set->bucket_wait);  in bch_allocator_thread()
356 		allocator_wait(ca, ca->set->gc_mark_valid &&  in bch_allocator_thread()
357 			       !ca->invalidate_needs_gc);  in bch_allocator_thread()
358 		invalidate_buckets(ca);  in bch_allocator_thread()
364 		allocator_wait(ca, !atomic_read(&ca->set->prio_blocked));  in bch_allocator_thread()
365 		if (CACHE_SYNC(&ca->set->sb)) {  in bch_allocator_thread()
377 			if (!fifo_full(&ca->free_inc))  in bch_allocator_thread()
380 			bch_prio_write(ca);  in bch_allocator_thread()
390 long bch_bucket_alloc(struct cache *ca, unsigned int reserve, bool wait)  in bch_bucket_alloc()  argument
398 	if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &ca->set->flags)))  in bch_bucket_alloc()
402 	if (fifo_pop(&ca->free[RESERVE_NONE], r) ||  in bch_bucket_alloc()
403 	    fifo_pop(&ca->free[reserve], r))  in bch_bucket_alloc()
407 		trace_bcache_alloc_fail(ca, reserve);  in bch_bucket_alloc()
412 		prepare_to_wait(&ca->set->bucket_wait, &w,  in bch_bucket_alloc()
415 		mutex_unlock(&ca->set->bucket_lock);  in bch_bucket_alloc()
417 		mutex_lock(&ca->set->bucket_lock);  in bch_bucket_alloc()
418 	} while (!fifo_pop(&ca->free[RESERVE_NONE], r) &&  in bch_bucket_alloc()
419 		 !fifo_pop(&ca->free[reserve], r));  in bch_bucket_alloc()
421 	finish_wait(&ca->set->bucket_wait, &w);  in bch_bucket_alloc()
423 	if (ca->alloc_thread)  in bch_bucket_alloc()
424 		wake_up_process(ca->alloc_thread);  in bch_bucket_alloc()
426 	trace_bcache_alloc(ca, reserve);  in bch_bucket_alloc()
428 	if (expensive_debug_checks(ca->set)) {  in bch_bucket_alloc()
433 		for (iter = 0; iter < prio_buckets(ca) * 2; iter++)  in bch_bucket_alloc()
434 			BUG_ON(ca->prio_buckets[iter] == (uint64_t) r);  in bch_bucket_alloc()
437 			fifo_for_each(i, &ca->free[j], iter)  in bch_bucket_alloc()
439 		fifo_for_each(i, &ca->free_inc, iter)  in bch_bucket_alloc()
443 	b = ca->buckets + r;  in bch_bucket_alloc()
447 	SET_GC_SECTORS_USED(b, ca->sb.bucket_size);  in bch_bucket_alloc()
459 	if (ca->set->avail_nbuckets > 0) {  in bch_bucket_alloc()
460 		ca->set->avail_nbuckets--;  in bch_bucket_alloc()
461 		bch_update_bucket_in_use(ca->set, &ca->set->gc_stats);  in bch_bucket_alloc()
467 void __bch_bucket_free(struct cache *ca, struct bucket *b)  in __bch_bucket_free()  argument
472 	if (ca->set->avail_nbuckets < ca->set->nbuckets) {  in __bch_bucket_free()
473 		ca->set->avail_nbuckets++;  in __bch_bucket_free()
474 		bch_update_bucket_in_use(ca->set, &ca->set->gc_stats);  in __bch_bucket_free()
504 		struct cache *ca = c->cache_by_alloc[i];  in __bch_bucket_alloc_set()  local
505 		long b = bch_bucket_alloc(ca, reserve, wait);  in __bch_bucket_alloc_set()
510 		k->ptr[i] = MAKE_PTR(ca->buckets[b].gen,  in __bch_bucket_alloc_set()
512 				ca->sb.nr_this_dev);  in __bch_bucket_alloc_set()
731 int bch_cache_allocator_start(struct cache *ca)  in bch_cache_allocator_start()  argument
734 					    ca, "bcache_allocator");  in bch_cache_allocator_start()
738 	ca->alloc_thread = k;  in bch_cache_allocator_start()