113 static int write_cached_data (struct mtdblk_dev *mtdblk)  in write_cached_data()  argument
115 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in write_cached_data()
118 	if (mtdblk->cache_state != STATE_DIRTY)  in write_cached_data()
123 			mtdblk->cache_offset, mtdblk->cache_size);  in write_cached_data()
125 	ret = erase_write (mtd, mtdblk->cache_offset,  in write_cached_data()
126 			   mtdblk->cache_size, mtdblk->cache_data);  in write_cached_data()
137 	mtdblk->cache_state = STATE_EMPTY;  in write_cached_data()
142 static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_write()  argument
145 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_write()
146 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_write()
175 			if (mtdblk->cache_state == STATE_DIRTY &&  in do_cached_write()
176 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
177 				ret = write_cached_data(mtdblk);  in do_cached_write()
182 			if (mtdblk->cache_state == STATE_EMPTY ||  in do_cached_write()
183 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
185 				mtdblk->cache_state = STATE_EMPTY;  in do_cached_write()
187 					       &retlen, mtdblk->cache_data);  in do_cached_write()
193 				mtdblk->cache_offset = sect_start;  in do_cached_write()
194 				mtdblk->cache_size = sect_size;  in do_cached_write()
195 				mtdblk->cache_state = STATE_CLEAN;  in do_cached_write()
199 			memcpy (mtdblk->cache_data + offset, buf, size);  in do_cached_write()
200 			mtdblk->cache_state = STATE_DIRTY;  in do_cached_write()
212 static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_read()  argument
215 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_read()
216 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_read()
239 		if (mtdblk->cache_state != STATE_EMPTY &&  in do_cached_read()
240 		    mtdblk->cache_offset == sect_start) {  in do_cached_read()
241 			memcpy (buf, mtdblk->cache_data + offset, size);  in do_cached_read()
261 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_readsect()  local
262 	return do_cached_read(mtdblk, block<<9, 512, buf);  in mtdblock_readsect()
268 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_writesect()  local
269 	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {  in mtdblock_writesect()
270 		mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);  in mtdblock_writesect()
271 		if (!mtdblk->cache_data)  in mtdblock_writesect()
278 	return do_cached_write(mtdblk, block<<9, 512, buf);  in mtdblock_writesect()
283 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_open()  local
287 	if (mtdblk->count) {  in mtdblock_open()
288 		mtdblk->count++;  in mtdblock_open()
293 	mtdblk->count = 1;  in mtdblock_open()
294 	mutex_init(&mtdblk->cache_mutex);  in mtdblock_open()
295 	mtdblk->cache_state = STATE_EMPTY;  in mtdblock_open()
297 		mtdblk->cache_size = mbd->mtd->erasesize;  in mtdblock_open()
298 		mtdblk->cache_data = NULL;  in mtdblock_open()
308 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_release()  local
312 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_release()
313 	write_cached_data(mtdblk);  in mtdblock_release()
314 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_release()
316 	if (!--mtdblk->count) {  in mtdblock_release()
323 		vfree(mtdblk->cache_data);  in mtdblock_release()
331 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_flush()  local
333 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_flush()
334 	write_cached_data(mtdblk);  in mtdblock_flush()
335 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_flush()