98 #define	MB_CACHE_ENTRY_LOCK_INDEX(ce)			\  argument
99 	(hash_long((unsigned long)ce, MB_CACHE_ENTRY_LOCK_BITS))
133 __spin_lock_mb_cache_entry(struct mb_cache_entry *ce)  in __spin_lock_mb_cache_entry()  argument
136 		MB_CACHE_ENTRY_LOCK_INDEX(ce)));  in __spin_lock_mb_cache_entry()
140 __spin_unlock_mb_cache_entry(struct mb_cache_entry *ce)  in __spin_unlock_mb_cache_entry()  argument
143 		MB_CACHE_ENTRY_LOCK_INDEX(ce)));  in __spin_unlock_mb_cache_entry()
147 __mb_cache_entry_is_block_hashed(struct mb_cache_entry *ce)  in __mb_cache_entry_is_block_hashed()  argument
149 	return !hlist_bl_unhashed(&ce->e_block_list);  in __mb_cache_entry_is_block_hashed()
154 __mb_cache_entry_unhash_block(struct mb_cache_entry *ce)  in __mb_cache_entry_unhash_block()  argument
156 	if (__mb_cache_entry_is_block_hashed(ce))  in __mb_cache_entry_unhash_block()
157 		hlist_bl_del_init(&ce->e_block_list);  in __mb_cache_entry_unhash_block()
161 __mb_cache_entry_is_index_hashed(struct mb_cache_entry *ce)  in __mb_cache_entry_is_index_hashed()  argument
163 	return !hlist_bl_unhashed(&ce->e_index.o_list);  in __mb_cache_entry_is_index_hashed()
167 __mb_cache_entry_unhash_index(struct mb_cache_entry *ce)  in __mb_cache_entry_unhash_index()  argument
169 	if (__mb_cache_entry_is_index_hashed(ce))  in __mb_cache_entry_unhash_index()
170 		hlist_bl_del_init(&ce->e_index.o_list);  in __mb_cache_entry_unhash_index()
182 __mb_cache_entry_unhash_unlock(struct mb_cache_entry *ce)  in __mb_cache_entry_unhash_unlock()  argument
184 	__mb_cache_entry_unhash_index(ce);  in __mb_cache_entry_unhash_unlock()
185 	hlist_bl_unlock(ce->e_index_hash_p);  in __mb_cache_entry_unhash_unlock()
186 	__mb_cache_entry_unhash_block(ce);  in __mb_cache_entry_unhash_unlock()
187 	hlist_bl_unlock(ce->e_block_hash_p);  in __mb_cache_entry_unhash_unlock()
191 __mb_cache_entry_forget(struct mb_cache_entry *ce, gfp_t gfp_mask)  in __mb_cache_entry_forget()  argument
193 	struct mb_cache *cache = ce->e_cache;  in __mb_cache_entry_forget()
195 	mb_assert(!(ce->e_used || ce->e_queued || atomic_read(&ce->e_refcnt)));  in __mb_cache_entry_forget()
196 	kmem_cache_free(cache->c_entry_cache, ce);  in __mb_cache_entry_forget()
201 __mb_cache_entry_release(struct mb_cache_entry *ce)  in __mb_cache_entry_release()  argument
204 	__spin_lock_mb_cache_entry(ce);  in __mb_cache_entry_release()
206 	if (ce->e_queued)  in __mb_cache_entry_release()
208 	if (ce->e_used >= MB_CACHE_WRITER)  in __mb_cache_entry_release()
209 		ce->e_used -= MB_CACHE_WRITER;  in __mb_cache_entry_release()
214 	ce->e_used--;  in __mb_cache_entry_release()
215 	if (!(ce->e_used || ce->e_queued || atomic_read(&ce->e_refcnt))) {  in __mb_cache_entry_release()
216 		if (!__mb_cache_entry_is_block_hashed(ce)) {  in __mb_cache_entry_release()
217 			__spin_unlock_mb_cache_entry(ce);  in __mb_cache_entry_release()
225 		if (list_empty(&ce->e_lru_list))  in __mb_cache_entry_release()
226 			list_add_tail(&ce->e_lru_list, &mb_cache_lru_list);  in __mb_cache_entry_release()
229 	__spin_unlock_mb_cache_entry(ce);  in __mb_cache_entry_release()
232 	mb_assert(list_empty(&ce->e_lru_list));  in __mb_cache_entry_release()
233 	__mb_cache_entry_forget(ce, GFP_KERNEL);  in __mb_cache_entry_release()
259 		struct mb_cache_entry *ce =  in mb_cache_shrink_scan()  local
262 		list_del_init(&ce->e_lru_list);  in mb_cache_shrink_scan()
263 		if (ce->e_used || ce->e_queued || atomic_read(&ce->e_refcnt))  in mb_cache_shrink_scan()
267 		hlist_bl_lock(ce->e_block_hash_p);  in mb_cache_shrink_scan()
268 		hlist_bl_lock(ce->e_index_hash_p);  in mb_cache_shrink_scan()
270 		if (ce->e_used || ce->e_queued || atomic_read(&ce->e_refcnt) ||  in mb_cache_shrink_scan()
271 			!list_empty(&ce->e_lru_list)) {  in mb_cache_shrink_scan()
272 			hlist_bl_unlock(ce->e_index_hash_p);  in mb_cache_shrink_scan()
273 			hlist_bl_unlock(ce->e_block_hash_p);  in mb_cache_shrink_scan()
277 		__mb_cache_entry_unhash_unlock(ce);  in mb_cache_shrink_scan()
278 		list_add_tail(&ce->e_lru_list, &free_list);  in mb_cache_shrink_scan()
400 	struct mb_cache_entry *ce, *tmp;  in mb_cache_shrink()  local
406 		ce = list_entry(l, struct mb_cache_entry, e_lru_list);  in mb_cache_shrink()
407 		if (ce->e_bdev == bdev) {  in mb_cache_shrink()
408 			list_del_init(&ce->e_lru_list);  in mb_cache_shrink()
409 			if (ce->e_used || ce->e_queued ||  in mb_cache_shrink()
410 				atomic_read(&ce->e_refcnt))  in mb_cache_shrink()
416 			hlist_bl_lock(ce->e_block_hash_p);  in mb_cache_shrink()
417 			hlist_bl_lock(ce->e_index_hash_p);  in mb_cache_shrink()
419 			if (ce->e_used || ce->e_queued ||  in mb_cache_shrink()
420 				atomic_read(&ce->e_refcnt) ||  in mb_cache_shrink()
421 				!list_empty(&ce->e_lru_list)) {  in mb_cache_shrink()
422 				hlist_bl_unlock(ce->e_index_hash_p);  in mb_cache_shrink()
423 				hlist_bl_unlock(ce->e_block_hash_p);  in mb_cache_shrink()
428 			__mb_cache_entry_unhash_unlock(ce);  in mb_cache_shrink()
429 			mb_assert(!(ce->e_used || ce->e_queued ||  in mb_cache_shrink()
430 				atomic_read(&ce->e_refcnt)));  in mb_cache_shrink()
431 			list_add_tail(&ce->e_lru_list, &free_list);  in mb_cache_shrink()
438 	list_for_each_entry_safe(ce, tmp, &free_list, e_lru_list) {  in mb_cache_shrink()
439 		__mb_cache_entry_forget(ce, GFP_KERNEL);  in mb_cache_shrink()
455 	struct mb_cache_entry *ce, *tmp;  in mb_cache_destroy()  local
458 	list_for_each_entry_safe(ce, tmp, &mb_cache_lru_list, e_lru_list) {  in mb_cache_destroy()
459 		if (ce->e_cache == cache)  in mb_cache_destroy()
460 			list_move_tail(&ce->e_lru_list, &free_list);  in mb_cache_destroy()
465 	list_for_each_entry_safe(ce, tmp, &free_list, e_lru_list) {  in mb_cache_destroy()
466 		list_del_init(&ce->e_lru_list);  in mb_cache_destroy()
470 		hlist_bl_lock(ce->e_block_hash_p);  in mb_cache_destroy()
471 		hlist_bl_lock(ce->e_index_hash_p);  in mb_cache_destroy()
472 		mb_assert(!(ce->e_used || ce->e_queued ||  in mb_cache_destroy()
473 			atomic_read(&ce->e_refcnt)));  in mb_cache_destroy()
474 		__mb_cache_entry_unhash_unlock(ce);  in mb_cache_destroy()
475 		__mb_cache_entry_forget(ce, GFP_KERNEL);  in mb_cache_destroy()
504 	struct mb_cache_entry *ce;  in mb_cache_entry_alloc()  local
513 			ce = list_entry(l, struct mb_cache_entry, e_lru_list);  in mb_cache_entry_alloc()
514 			if (ce->e_cache == cache) {  in mb_cache_entry_alloc()
515 				list_del_init(&ce->e_lru_list);  in mb_cache_entry_alloc()
516 				if (ce->e_used || ce->e_queued ||  in mb_cache_entry_alloc()
517 					atomic_read(&ce->e_refcnt))  in mb_cache_entry_alloc()
524 				hlist_bl_lock(ce->e_block_hash_p);  in mb_cache_entry_alloc()
525 				hlist_bl_lock(ce->e_index_hash_p);  in mb_cache_entry_alloc()
527 				if (ce->e_used || ce->e_queued ||  in mb_cache_entry_alloc()
528 					atomic_read(&ce->e_refcnt) ||  in mb_cache_entry_alloc()
529 					!list_empty(&ce->e_lru_list)) {  in mb_cache_entry_alloc()
530 					hlist_bl_unlock(ce->e_index_hash_p);  in mb_cache_entry_alloc()
531 					hlist_bl_unlock(ce->e_block_hash_p);  in mb_cache_entry_alloc()
536 				mb_assert(list_empty(&ce->e_lru_list));  in mb_cache_entry_alloc()
537 				mb_assert(!(ce->e_used || ce->e_queued ||  in mb_cache_entry_alloc()
538 					atomic_read(&ce->e_refcnt)));  in mb_cache_entry_alloc()
539 				__mb_cache_entry_unhash_unlock(ce);  in mb_cache_entry_alloc()
546 	ce = kmem_cache_alloc(cache->c_entry_cache, gfp_flags);  in mb_cache_entry_alloc()
547 	if (!ce)  in mb_cache_entry_alloc()
550 	INIT_LIST_HEAD(&ce->e_lru_list);  in mb_cache_entry_alloc()
551 	INIT_HLIST_BL_NODE(&ce->e_block_list);  in mb_cache_entry_alloc()
552 	INIT_HLIST_BL_NODE(&ce->e_index.o_list);  in mb_cache_entry_alloc()
553 	ce->e_cache = cache;  in mb_cache_entry_alloc()
554 	ce->e_queued = 0;  in mb_cache_entry_alloc()
555 	atomic_set(&ce->e_refcnt, 0);  in mb_cache_entry_alloc()
557 	ce->e_block_hash_p = &cache->c_block_hash[0];  in mb_cache_entry_alloc()
558 	ce->e_index_hash_p = &cache->c_index_hash[0];  in mb_cache_entry_alloc()
559 	ce->e_used = 1 + MB_CACHE_WRITER;  in mb_cache_entry_alloc()
560 	return ce;  in mb_cache_entry_alloc()
579 mb_cache_entry_insert(struct mb_cache_entry *ce, struct block_device *bdev,  in mb_cache_entry_insert()  argument
582 	struct mb_cache *cache = ce->e_cache;  in mb_cache_entry_insert()
589 	mb_assert(ce);  in mb_cache_entry_insert()
600 	mb_assert(!__mb_cache_entry_is_block_hashed(ce));  in mb_cache_entry_insert()
601 	__mb_cache_entry_unhash_block(ce);  in mb_cache_entry_insert()
602 	__mb_cache_entry_unhash_index(ce);  in mb_cache_entry_insert()
603 	ce->e_bdev = bdev;  in mb_cache_entry_insert()
604 	ce->e_block = block;  in mb_cache_entry_insert()
605 	ce->e_block_hash_p = block_hash_p;  in mb_cache_entry_insert()
606 	ce->e_index.o_key = key;  in mb_cache_entry_insert()
607 	hlist_bl_add_head(&ce->e_block_list, block_hash_p);  in mb_cache_entry_insert()
612 	ce->e_index_hash_p = index_hash_p;  in mb_cache_entry_insert()
613 	hlist_bl_add_head(&ce->e_index.o_list, index_hash_p);  in mb_cache_entry_insert()
627 mb_cache_entry_release(struct mb_cache_entry *ce)  in mb_cache_entry_release()  argument
629 	__mb_cache_entry_release(ce);  in mb_cache_entry_release()
638 mb_cache_entry_free(struct mb_cache_entry *ce)  in mb_cache_entry_free()  argument
640 	mb_assert(ce);  in mb_cache_entry_free()
641 	mb_assert(list_empty(&ce->e_lru_list));  in mb_cache_entry_free()
642 	hlist_bl_lock(ce->e_index_hash_p);  in mb_cache_entry_free()
643 	__mb_cache_entry_unhash_index(ce);  in mb_cache_entry_free()
644 	hlist_bl_unlock(ce->e_index_hash_p);  in mb_cache_entry_free()
645 	hlist_bl_lock(ce->e_block_hash_p);  in mb_cache_entry_free()
646 	__mb_cache_entry_unhash_block(ce);  in mb_cache_entry_free()
647 	hlist_bl_unlock(ce->e_block_hash_p);  in mb_cache_entry_free()
648 	__mb_cache_entry_release(ce);  in mb_cache_entry_free()
666 	struct mb_cache_entry *ce;  in mb_cache_entry_get()  local
674 	hlist_bl_for_each_entry(ce, l, block_hash_p, e_block_list) {  in mb_cache_entry_get()
675 		mb_assert(ce->e_block_hash_p == block_hash_p);  in mb_cache_entry_get()
676 		if (ce->e_bdev == bdev && ce->e_block == block) {  in mb_cache_entry_get()
680 			atomic_inc(&ce->e_refcnt);  in mb_cache_entry_get()
682 			__spin_lock_mb_cache_entry(ce);  in mb_cache_entry_get()
683 			atomic_dec(&ce->e_refcnt);  in mb_cache_entry_get()
684 			if (ce->e_used > 0) {  in mb_cache_entry_get()
686 				while (ce->e_used > 0) {  in mb_cache_entry_get()
687 					ce->e_queued++;  in mb_cache_entry_get()
690 					__spin_unlock_mb_cache_entry(ce);  in mb_cache_entry_get()
692 					__spin_lock_mb_cache_entry(ce);  in mb_cache_entry_get()
693 					ce->e_queued--;  in mb_cache_entry_get()
697 			ce->e_used += 1 + MB_CACHE_WRITER;  in mb_cache_entry_get()
698 			__spin_unlock_mb_cache_entry(ce);  in mb_cache_entry_get()
700 			if (!list_empty(&ce->e_lru_list)) {  in mb_cache_entry_get()
702 				list_del_init(&ce->e_lru_list);  in mb_cache_entry_get()
705 			if (!__mb_cache_entry_is_block_hashed(ce)) {  in mb_cache_entry_get()
706 				__mb_cache_entry_release(ce);  in mb_cache_entry_get()
709 			return ce;  in mb_cache_entry_get()
725 		struct mb_cache_entry *ce =  in __mb_cache_entry_find()  local
728 		mb_assert(ce->e_index_hash_p == head);  in __mb_cache_entry_find()
729 		if (ce->e_bdev == bdev && ce->e_index.o_key == key) {  in __mb_cache_entry_find()
733 			atomic_inc(&ce->e_refcnt);  in __mb_cache_entry_find()
735 			__spin_lock_mb_cache_entry(ce);  in __mb_cache_entry_find()
736 			atomic_dec(&ce->e_refcnt);  in __mb_cache_entry_find()
737 			ce->e_used++;  in __mb_cache_entry_find()
740 			if (ce->e_used >= MB_CACHE_WRITER) {  in __mb_cache_entry_find()
743 				while (ce->e_used >= MB_CACHE_WRITER) {  in __mb_cache_entry_find()
744 					ce->e_queued++;  in __mb_cache_entry_find()
747 					__spin_unlock_mb_cache_entry(ce);  in __mb_cache_entry_find()
749 					__spin_lock_mb_cache_entry(ce);  in __mb_cache_entry_find()
750 					ce->e_queued--;  in __mb_cache_entry_find()
754 			__spin_unlock_mb_cache_entry(ce);  in __mb_cache_entry_find()
755 			if (!list_empty(&ce->e_lru_list)) {  in __mb_cache_entry_find()
757 				list_del_init(&ce->e_lru_list);  in __mb_cache_entry_find()
760 			if (!__mb_cache_entry_is_block_hashed(ce)) {  in __mb_cache_entry_find()
761 				__mb_cache_entry_release(ce);  in __mb_cache_entry_find()
764 			return ce;  in __mb_cache_entry_find()
791 	struct mb_cache_entry *ce = NULL;  in mb_cache_entry_find_first()  local
798 		ce = __mb_cache_entry_find(l, index_hash_p, bdev, key);  in mb_cache_entry_find_first()
801 	return ce;  in mb_cache_entry_find_first()
830 	struct mb_cache_entry *ce;  in mb_cache_entry_find_next()  local
838 	ce = __mb_cache_entry_find(l, index_hash_p, bdev, key);  in mb_cache_entry_find_next()
840 	return ce;  in mb_cache_entry_find_next()