53 	struct squashfs_cache *cache, u64 block, int length)  in squashfs_cache_get()  argument
58 	spin_lock(&cache->lock);  in squashfs_cache_get()
61 		for (i = cache->curr_blk, n = 0; n < cache->entries; n++) {  in squashfs_cache_get()
62 			if (cache->entry[i].block == block) {  in squashfs_cache_get()
63 				cache->curr_blk = i;  in squashfs_cache_get()
66 			i = (i + 1) % cache->entries;  in squashfs_cache_get()
69 		if (n == cache->entries) {  in squashfs_cache_get()
74 			if (cache->unused == 0) {  in squashfs_cache_get()
75 				cache->num_waiters++;  in squashfs_cache_get()
76 				spin_unlock(&cache->lock);  in squashfs_cache_get()
77 				wait_event(cache->wait_queue, cache->unused);  in squashfs_cache_get()
78 				spin_lock(&cache->lock);  in squashfs_cache_get()
79 				cache->num_waiters--;  in squashfs_cache_get()
88 			i = cache->next_blk;  in squashfs_cache_get()
89 			for (n = 0; n < cache->entries; n++) {  in squashfs_cache_get()
90 				if (cache->entry[i].refcount == 0)  in squashfs_cache_get()
92 				i = (i + 1) % cache->entries;  in squashfs_cache_get()
95 			cache->next_blk = (i + 1) % cache->entries;  in squashfs_cache_get()
96 			entry = &cache->entry[i];  in squashfs_cache_get()
102 			cache->unused--;  in squashfs_cache_get()
108 			spin_unlock(&cache->lock);  in squashfs_cache_get()
113 			spin_lock(&cache->lock);  in squashfs_cache_get()
126 				spin_unlock(&cache->lock);  in squashfs_cache_get()
129 				spin_unlock(&cache->lock);  in squashfs_cache_get()
140 		entry = &cache->entry[i];  in squashfs_cache_get()
142 			cache->unused--;  in squashfs_cache_get()
151 			spin_unlock(&cache->lock);  in squashfs_cache_get()
154 			spin_unlock(&cache->lock);  in squashfs_cache_get()
161 		cache->name, i, entry->block, entry->refcount, entry->error);  in squashfs_cache_get()
164 		ERROR("Unable to read %s cache entry [%llx]\n", cache->name,  in squashfs_cache_get()
175 	struct squashfs_cache *cache = entry->cache;  in squashfs_cache_put()  local
177 	spin_lock(&cache->lock);  in squashfs_cache_put()
180 		cache->unused++;  in squashfs_cache_put()
185 		if (cache->num_waiters) {  in squashfs_cache_put()
186 			spin_unlock(&cache->lock);  in squashfs_cache_put()
187 			wake_up(&cache->wait_queue);  in squashfs_cache_put()
191 	spin_unlock(&cache->lock);  in squashfs_cache_put()
197 void squashfs_cache_delete(struct squashfs_cache *cache)  in squashfs_cache_delete()  argument
201 	if (cache == NULL)  in squashfs_cache_delete()
204 	for (i = 0; i < cache->entries; i++) {  in squashfs_cache_delete()
205 		if (cache->entry[i].data) {  in squashfs_cache_delete()
206 			for (j = 0; j < cache->pages; j++)  in squashfs_cache_delete()
207 				kfree(cache->entry[i].data[j]);  in squashfs_cache_delete()
208 			kfree(cache->entry[i].data);  in squashfs_cache_delete()
210 		kfree(cache->entry[i].actor);  in squashfs_cache_delete()
213 	kfree(cache->entry);  in squashfs_cache_delete()
214 	kfree(cache);  in squashfs_cache_delete()
227 	struct squashfs_cache *cache = kzalloc(sizeof(*cache), GFP_KERNEL);  in squashfs_cache_init()  local
229 	if (cache == NULL) {  in squashfs_cache_init()
234 	cache->entry = kcalloc(entries, sizeof(*(cache->entry)), GFP_KERNEL);  in squashfs_cache_init()
235 	if (cache->entry == NULL) {  in squashfs_cache_init()
240 	cache->curr_blk = 0;  in squashfs_cache_init()
241 	cache->next_blk = 0;  in squashfs_cache_init()
242 	cache->unused = entries;  in squashfs_cache_init()
243 	cache->entries = entries;  in squashfs_cache_init()
244 	cache->block_size = block_size;  in squashfs_cache_init()
245 	cache->pages = block_size >> PAGE_SHIFT;  in squashfs_cache_init()
246 	cache->pages = cache->pages ? cache->pages : 1;  in squashfs_cache_init()
247 	cache->name = name;  in squashfs_cache_init()
248 	cache->num_waiters = 0;  in squashfs_cache_init()
249 	spin_lock_init(&cache->lock);  in squashfs_cache_init()
250 	init_waitqueue_head(&cache->wait_queue);  in squashfs_cache_init()
253 		struct squashfs_cache_entry *entry = &cache->entry[i];  in squashfs_cache_init()
255 		init_waitqueue_head(&cache->entry[i].wait_queue);  in squashfs_cache_init()
256 		entry->cache = cache;  in squashfs_cache_init()
258 		entry->data = kcalloc(cache->pages, sizeof(void *), GFP_KERNEL);  in squashfs_cache_init()
264 		for (j = 0; j < cache->pages; j++) {  in squashfs_cache_init()
273 						cache->pages, 0);  in squashfs_cache_init()
280 	return cache;  in squashfs_cache_init()
283 	squashfs_cache_delete(cache);  in squashfs_cache_init()