26 	struct fscache_cache *cache;  in fscache_alloc_cache()  local
28 	cache = kzalloc(sizeof(*cache), GFP_KERNEL);  in fscache_alloc_cache()
29 	if (cache) {  in fscache_alloc_cache()
31 			cache->name = kstrdup(name, GFP_KERNEL);  in fscache_alloc_cache()
32 			if (!cache->name) {  in fscache_alloc_cache()
33 				kfree(cache);  in fscache_alloc_cache()
37 		refcount_set(&cache->ref, 1);  in fscache_alloc_cache()
38 		INIT_LIST_HEAD(&cache->cache_link);  in fscache_alloc_cache()
39 		cache->debug_id = atomic_inc_return(&fscache_cache_debug_id);  in fscache_alloc_cache()
41 	return cache;  in fscache_alloc_cache()
44 static bool fscache_get_cache_maybe(struct fscache_cache *cache,  in fscache_get_cache_maybe()  argument
50 	success = __refcount_inc_not_zero(&cache->ref, &ref);  in fscache_get_cache_maybe()
52 		trace_fscache_cache(cache->debug_id, ref + 1, where);  in fscache_get_cache_maybe()
61 	struct fscache_cache *candidate, *cache, *unnamed = NULL;  in fscache_lookup_cache()  local
66 	list_for_each_entry(cache, &fscache_caches, cache_link) {  in fscache_lookup_cache()
67 		if (cache->name && name && strcmp(cache->name, name) == 0 &&  in fscache_lookup_cache()
68 		    fscache_get_cache_maybe(cache, fscache_cache_get_acquire))  in fscache_lookup_cache()
70 		if (!cache->name && !name &&  in fscache_lookup_cache()
71 		    fscache_get_cache_maybe(cache, fscache_cache_get_acquire))  in fscache_lookup_cache()
76 		list_for_each_entry(cache, &fscache_caches, cache_link) {  in fscache_lookup_cache()
77 			if (cache->name &&  in fscache_lookup_cache()
78 			    fscache_get_cache_maybe(cache, fscache_cache_get_acquire))  in fscache_lookup_cache()
93 	list_for_each_entry(cache, &fscache_caches, cache_link) {  in fscache_lookup_cache()
94 		if (cache->name && name && strcmp(cache->name, name) == 0 &&  in fscache_lookup_cache()
95 		    fscache_get_cache_maybe(cache, fscache_cache_get_acquire))  in fscache_lookup_cache()
97 		if (!cache->name) {  in fscache_lookup_cache()
98 			unnamed = cache;  in fscache_lookup_cache()
100 			    fscache_get_cache_maybe(cache, fscache_cache_get_acquire))  in fscache_lookup_cache()
110 		list_for_each_entry(cache, &fscache_caches, cache_link) {  in fscache_lookup_cache()
111 			if (cache->name &&  in fscache_lookup_cache()
112 			    fscache_get_cache_maybe(cache, fscache_cache_get_acquire))  in fscache_lookup_cache()
126 	return cache;  in fscache_lookup_cache()
128 	cache = unnamed;  in fscache_lookup_cache()
129 	cache->name = candidate->name;  in fscache_lookup_cache()
135 	return cache;  in fscache_lookup_cache()
151 	struct fscache_cache *cache;  in fscache_acquire_cache()  local
154 	cache = fscache_lookup_cache(name, true);  in fscache_acquire_cache()
155 	if (IS_ERR(cache))  in fscache_acquire_cache()
156 		return cache;  in fscache_acquire_cache()
158 	if (!fscache_set_cache_state_maybe(cache,  in fscache_acquire_cache()
162 		fscache_put_cache(cache, fscache_cache_put_cache);  in fscache_acquire_cache()
166 	return cache;  in fscache_acquire_cache()
179 void fscache_put_cache(struct fscache_cache *cache,  in fscache_put_cache()  argument
186 	if (IS_ERR_OR_NULL(cache))  in fscache_put_cache()
189 	debug_id = cache->debug_id;  in fscache_put_cache()
190 	zero = __refcount_dec_and_test(&cache->ref, &ref);  in fscache_put_cache()
195 		list_del_init(&cache->cache_link);  in fscache_put_cache()
197 		kfree(cache->name);  in fscache_put_cache()
198 		kfree(cache);  in fscache_put_cache()
209 void fscache_relinquish_cache(struct fscache_cache *cache)  in fscache_relinquish_cache()  argument
212 		(cache->state == FSCACHE_CACHE_IS_PREPARING) ?  in fscache_relinquish_cache()
216 	cache->ops = NULL;  in fscache_relinquish_cache()
217 	cache->cache_priv = NULL;  in fscache_relinquish_cache()
218 	fscache_set_cache_state(cache, FSCACHE_CACHE_IS_NOT_PRESENT);  in fscache_relinquish_cache()
219 	fscache_put_cache(cache, where);  in fscache_relinquish_cache()
234 int fscache_add_cache(struct fscache_cache *cache,  in fscache_add_cache()  argument
240 	_enter("{%s,%s}", ops->name, cache->name);  in fscache_add_cache()
242 	BUG_ON(fscache_cache_state(cache) != FSCACHE_CACHE_IS_PREPARING);  in fscache_add_cache()
248 	n_accesses = atomic_inc_return(&cache->n_accesses);  in fscache_add_cache()
249 	trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),  in fscache_add_cache()
254 	cache->ops = ops;  in fscache_add_cache()
255 	cache->cache_priv = cache_priv;  in fscache_add_cache()
256 	fscache_set_cache_state(cache, FSCACHE_CACHE_IS_ACTIVE);  in fscache_add_cache()
259 	pr_notice("Cache \"%s\" added (type %s)\n", cache->name, ops->name);  in fscache_add_cache()
260 	_leave(" = 0 [%s]", cache->name);  in fscache_add_cache()
289 bool fscache_begin_cache_access(struct fscache_cache *cache, enum fscache_access_trace why)  in fscache_begin_cache_access()  argument
293 	if (!fscache_cache_is_live(cache))  in fscache_begin_cache_access()
296 	n_accesses = atomic_inc_return(&cache->n_accesses);  in fscache_begin_cache_access()
298 	trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),  in fscache_begin_cache_access()
300 	if (!fscache_cache_is_live(cache)) {  in fscache_begin_cache_access()
301 		fscache_end_cache_access(cache, fscache_access_unlive);  in fscache_begin_cache_access()
315 void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_trace why)  in fscache_end_cache_access()  argument
320 	n_accesses = atomic_dec_return(&cache->n_accesses);  in fscache_end_cache_access()
321 	trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),  in fscache_end_cache_access()
324 		wake_up_var(&cache->n_accesses);  in fscache_end_cache_access()
337 void fscache_io_error(struct fscache_cache *cache)  in fscache_io_error()  argument
339 	if (fscache_set_cache_state_maybe(cache,  in fscache_io_error()
343 		       cache->name);  in fscache_io_error()
355 void fscache_withdraw_cache(struct fscache_cache *cache)  in fscache_withdraw_cache()  argument
360 		  cache->name, atomic_read(&cache->object_count));  in fscache_withdraw_cache()
362 	fscache_set_cache_state(cache, FSCACHE_CACHE_IS_WITHDRAWN);  in fscache_withdraw_cache()
365 	n_accesses = atomic_dec_return(&cache->n_accesses);  in fscache_withdraw_cache()
366 	trace_fscache_access_cache(cache->debug_id, refcount_read(&cache->ref),  in fscache_withdraw_cache()
369 	wait_var_event(&cache->n_accesses,  in fscache_withdraw_cache()
370 		       atomic_read(&cache->n_accesses) == 0);  in fscache_withdraw_cache()
382 	struct fscache_cache *cache;  in fscache_caches_seq_show()  local
392 	cache = list_entry(v, struct fscache_cache, cache_link);  in fscache_caches_seq_show()
395 		   cache->debug_id,  in fscache_caches_seq_show()
396 		   refcount_read(&cache->ref),  in fscache_caches_seq_show()
397 		   atomic_read(&cache->n_volumes),  in fscache_caches_seq_show()
398 		   atomic_read(&cache->object_count),  in fscache_caches_seq_show()
399 		   atomic_read(&cache->n_accesses),  in fscache_caches_seq_show()
400 		   fscache_cache_states[cache->state],  in fscache_caches_seq_show()
401 		   cache->name ?: "-");  in fscache_caches_seq_show()