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
106 	ca = c->cache;  in bch_rescale_priorities()
107 	for_each_bucket(b, ca)  in bch_rescale_priorities()
130 bool bch_can_invalidate_bucket(struct cache *ca, struct bucket *b)  in bch_can_invalidate_bucket()  argument
132 	BUG_ON(!ca->set->gc_mark_valid);  in bch_can_invalidate_bucket()
140 void __bch_invalidate_one_bucket(struct cache *ca, struct bucket *b)  in __bch_invalidate_one_bucket()  argument
142 	lockdep_assert_held(&ca->set->bucket_lock);  in __bch_invalidate_one_bucket()
146 		trace_bcache_invalidate(ca, b - ca->buckets);  in __bch_invalidate_one_bucket()
148 	bch_inc_gen(ca, b);  in __bch_invalidate_one_bucket()
153 static void bch_invalidate_one_bucket(struct cache *ca, struct bucket *b)  in bch_invalidate_one_bucket()  argument
155 	__bch_invalidate_one_bucket(ca, b);  in bch_invalidate_one_bucket()
157 	fifo_push(&ca->free_inc, b - ca->buckets);  in bch_invalidate_one_bucket()
171 	unsigned int min_prio = (INITIAL_PRIO - ca->set->min_prio) / 8;	\
173 	(b->prio - ca->set->min_prio + min_prio) * GC_SECTORS_USED(b);	\
179 static void invalidate_buckets_lru(struct cache *ca)  in invalidate_buckets_lru()  argument
184 	ca->heap.used = 0;  in invalidate_buckets_lru()
186 	for_each_bucket(b, ca) {  in invalidate_buckets_lru()
187 		if (!bch_can_invalidate_bucket(ca, b))  in invalidate_buckets_lru()
190 		if (!heap_full(&ca->heap))  in invalidate_buckets_lru()
191 			heap_add(&ca->heap, b, bucket_max_cmp);  in invalidate_buckets_lru()
192 		else if (bucket_max_cmp(b, heap_peek(&ca->heap))) {  in invalidate_buckets_lru()
193 			ca->heap.data[0] = b;  in invalidate_buckets_lru()
194 			heap_sift(&ca->heap, 0, bucket_max_cmp);  in invalidate_buckets_lru()
198 	for (i = ca->heap.used / 2 - 1; i >= 0; --i)  in invalidate_buckets_lru()
199 		heap_sift(&ca->heap, i, bucket_min_cmp);  in invalidate_buckets_lru()
201 	while (!fifo_full(&ca->free_inc)) {  in invalidate_buckets_lru()
202 		if (!heap_pop(&ca->heap, b, bucket_min_cmp)) {  in invalidate_buckets_lru()
207 			ca->invalidate_needs_gc = 1;  in invalidate_buckets_lru()
208 			wake_up_gc(ca->set);  in invalidate_buckets_lru()
212 		bch_invalidate_one_bucket(ca, b);  in invalidate_buckets_lru()
216 static void invalidate_buckets_fifo(struct cache *ca)  in invalidate_buckets_fifo()  argument
221 	while (!fifo_full(&ca->free_inc)) {  in invalidate_buckets_fifo()
222 		if (ca->fifo_last_bucket <  ca->sb.first_bucket ||  in invalidate_buckets_fifo()
223 		    ca->fifo_last_bucket >= ca->sb.nbuckets)  in invalidate_buckets_fifo()
224 			ca->fifo_last_bucket = ca->sb.first_bucket;  in invalidate_buckets_fifo()
226 		b = ca->buckets + ca->fifo_last_bucket++;  in invalidate_buckets_fifo()
228 		if (bch_can_invalidate_bucket(ca, b))  in invalidate_buckets_fifo()
229 			bch_invalidate_one_bucket(ca, b);  in invalidate_buckets_fifo()
231 		if (++checked >= ca->sb.nbuckets) {  in invalidate_buckets_fifo()
232 			ca->invalidate_needs_gc = 1;  in invalidate_buckets_fifo()
233 			wake_up_gc(ca->set);  in invalidate_buckets_fifo()
239 static void invalidate_buckets_random(struct cache *ca)  in invalidate_buckets_random()  argument
244 	while (!fifo_full(&ca->free_inc)) {  in invalidate_buckets_random()
249 		n %= (size_t) (ca->sb.nbuckets - ca->sb.first_bucket);  in invalidate_buckets_random()
250 		n += ca->sb.first_bucket;  in invalidate_buckets_random()
252 		b = ca->buckets + n;  in invalidate_buckets_random()
254 		if (bch_can_invalidate_bucket(ca, b))  in invalidate_buckets_random()
255 			bch_invalidate_one_bucket(ca, b);  in invalidate_buckets_random()
257 		if (++checked >= ca->sb.nbuckets / 2) {  in invalidate_buckets_random()
258 			ca->invalidate_needs_gc = 1;  in invalidate_buckets_random()
259 			wake_up_gc(ca->set);  in invalidate_buckets_random()
265 static void invalidate_buckets(struct cache *ca)  in invalidate_buckets()  argument
267 	BUG_ON(ca->invalidate_needs_gc);  in invalidate_buckets()
269 	switch (CACHE_REPLACEMENT(&ca->sb)) {  in invalidate_buckets()
271 		invalidate_buckets_lru(ca);  in invalidate_buckets()
274 		invalidate_buckets_fifo(ca);  in invalidate_buckets()
277 		invalidate_buckets_random(ca);  in invalidate_buckets()
282 #define allocator_wait(ca, cond)					\  argument
289 		mutex_unlock(&(ca)->set->bucket_lock);			\
291 		    test_bit(CACHE_SET_IO_DISABLE, &ca->set->flags)) {	\
297 		mutex_lock(&(ca)->set->bucket_lock);			\
302 static int bch_allocator_push(struct cache *ca, long bucket)  in bch_allocator_push()  argument
307 	if (fifo_push(&ca->free[RESERVE_PRIO], bucket))  in bch_allocator_push()
311 		if (fifo_push(&ca->free[i], bucket))  in bch_allocator_push()
319 	struct cache *ca = arg;  in bch_allocator_thread()  local
321 	mutex_lock(&ca->set->bucket_lock);  in bch_allocator_thread()
332 			if (!fifo_pop(&ca->free_inc, bucket))  in bch_allocator_thread()
335 			if (ca->discard) {  in bch_allocator_thread()
336 				mutex_unlock(&ca->set->bucket_lock);  in bch_allocator_thread()
337 				blkdev_issue_discard(ca->bdev,  in bch_allocator_thread()
338 					bucket_to_sector(ca->set, bucket),  in bch_allocator_thread()
339 					ca->sb.bucket_size, GFP_KERNEL);  in bch_allocator_thread()
340 				mutex_lock(&ca->set->bucket_lock);  in bch_allocator_thread()
343 			allocator_wait(ca, bch_allocator_push(ca, bucket));  in bch_allocator_thread()
344 			wake_up(&ca->set->btree_cache_wait);  in bch_allocator_thread()
345 			wake_up(&ca->set->bucket_wait);  in bch_allocator_thread()
355 		allocator_wait(ca, ca->set->gc_mark_valid &&  in bch_allocator_thread()
356 			       !ca->invalidate_needs_gc);  in bch_allocator_thread()
357 		invalidate_buckets(ca);  in bch_allocator_thread()
363 		allocator_wait(ca, !atomic_read(&ca->set->prio_blocked));  in bch_allocator_thread()
364 		if (CACHE_SYNC(&ca->sb)) {  in bch_allocator_thread()
376 			if (!fifo_full(&ca->free_inc))  in bch_allocator_thread()
379 			if (bch_prio_write(ca, false) < 0) {  in bch_allocator_thread()
380 				ca->invalidate_needs_gc = 1;  in bch_allocator_thread()
381 				wake_up_gc(ca->set);  in bch_allocator_thread()
392 long bch_bucket_alloc(struct cache *ca, unsigned int reserve, bool wait)  in bch_bucket_alloc()  argument
400 	if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &ca->set->flags)))  in bch_bucket_alloc()
404 	if (fifo_pop(&ca->free[RESERVE_NONE], r) ||  in bch_bucket_alloc()
405 	    fifo_pop(&ca->free[reserve], r))  in bch_bucket_alloc()
409 		trace_bcache_alloc_fail(ca, reserve);  in bch_bucket_alloc()
414 		prepare_to_wait(&ca->set->bucket_wait, &w,  in bch_bucket_alloc()
417 		mutex_unlock(&ca->set->bucket_lock);  in bch_bucket_alloc()
419 		mutex_lock(&ca->set->bucket_lock);  in bch_bucket_alloc()
420 	} while (!fifo_pop(&ca->free[RESERVE_NONE], r) &&  in bch_bucket_alloc()
421 		 !fifo_pop(&ca->free[reserve], r));  in bch_bucket_alloc()
423 	finish_wait(&ca->set->bucket_wait, &w);  in bch_bucket_alloc()
425 	if (ca->alloc_thread)  in bch_bucket_alloc()
426 		wake_up_process(ca->alloc_thread);  in bch_bucket_alloc()
428 	trace_bcache_alloc(ca, reserve);  in bch_bucket_alloc()
430 	if (expensive_debug_checks(ca->set)) {  in bch_bucket_alloc()
435 		for (iter = 0; iter < prio_buckets(ca) * 2; iter++)  in bch_bucket_alloc()
436 			BUG_ON(ca->prio_buckets[iter] == (uint64_t) r);  in bch_bucket_alloc()
439 			fifo_for_each(i, &ca->free[j], iter)  in bch_bucket_alloc()
441 		fifo_for_each(i, &ca->free_inc, iter)  in bch_bucket_alloc()
445 	b = ca->buckets + r;  in bch_bucket_alloc()
449 	SET_GC_SECTORS_USED(b, ca->sb.bucket_size);  in bch_bucket_alloc()
461 	if (ca->set->avail_nbuckets > 0) {  in bch_bucket_alloc()
462 		ca->set->avail_nbuckets--;  in bch_bucket_alloc()
463 		bch_update_bucket_in_use(ca->set, &ca->set->gc_stats);  in bch_bucket_alloc()
469 void __bch_bucket_free(struct cache *ca, struct bucket *b)  in __bch_bucket_free()  argument
474 	if (ca->set->avail_nbuckets < ca->set->nbuckets) {  in __bch_bucket_free()
475 		ca->set->avail_nbuckets++;  in __bch_bucket_free()
476 		bch_update_bucket_in_use(ca->set, &ca->set->gc_stats);  in __bch_bucket_free()
491 	struct cache *ca;  in __bch_bucket_alloc_set()  local
502 	ca = c->cache;  in __bch_bucket_alloc_set()
503 	b = bch_bucket_alloc(ca, reserve, wait);  in __bch_bucket_alloc_set()
507 	k->ptr[0] = MAKE_PTR(ca->buckets[b].gen,  in __bch_bucket_alloc_set()
509 			     ca->sb.nr_this_dev);  in __bch_bucket_alloc_set()
727 int bch_cache_allocator_start(struct cache *ca)  in bch_cache_allocator_start()  argument
730 					    ca, "bcache_allocator");  in bch_cache_allocator_start()
734 	ca->alloc_thread = k;  in bch_cache_allocator_start()