78 static int write_cached_data (struct mtdblk_dev *mtdblk)  in write_cached_data()  argument
80 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in write_cached_data()
83 	if (mtdblk->cache_state != STATE_DIRTY)  in write_cached_data()
88 			mtdblk->cache_offset, mtdblk->cache_size);  in write_cached_data()
90 	ret = erase_write (mtd, mtdblk->cache_offset,  in write_cached_data()
91 			   mtdblk->cache_size, mtdblk->cache_data);  in write_cached_data()
105 		mtdblk->cache_state = STATE_EMPTY;  in write_cached_data()
110 static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_write()  argument
113 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_write()
114 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_write()
143 			if (mtdblk->cache_state == STATE_DIRTY &&  in do_cached_write()
144 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
145 				ret = write_cached_data(mtdblk);  in do_cached_write()
150 			if (mtdblk->cache_state == STATE_EMPTY ||  in do_cached_write()
151 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
153 				mtdblk->cache_state = STATE_EMPTY;  in do_cached_write()
155 					       &retlen, mtdblk->cache_data);  in do_cached_write()
161 				mtdblk->cache_offset = sect_start;  in do_cached_write()
162 				mtdblk->cache_size = sect_size;  in do_cached_write()
163 				mtdblk->cache_state = STATE_CLEAN;  in do_cached_write()
167 			memcpy (mtdblk->cache_data + offset, buf, size);  in do_cached_write()
168 			mtdblk->cache_state = STATE_DIRTY;  in do_cached_write()
180 static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_read()  argument
183 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_read()
184 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_read()
207 		if (mtdblk->cache_state != STATE_EMPTY &&  in do_cached_read()
208 		    mtdblk->cache_offset == sect_start) {  in do_cached_read()
209 			memcpy (buf, mtdblk->cache_data + offset, size);  in do_cached_read()
229 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_readsect()  local
230 	return do_cached_read(mtdblk, block<<9, 512, buf);  in mtdblock_readsect()
236 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_writesect()  local
237 	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {  in mtdblock_writesect()
238 		mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);  in mtdblock_writesect()
239 		if (!mtdblk->cache_data)  in mtdblock_writesect()
246 	return do_cached_write(mtdblk, block<<9, 512, buf);  in mtdblock_writesect()
251 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_open()  local
255 	if (mtdblk->count) {  in mtdblock_open()
256 		mtdblk->count++;  in mtdblock_open()
261 	mtdblk->count = 1;  in mtdblock_open()
262 	mutex_init(&mtdblk->cache_mutex);  in mtdblock_open()
263 	mtdblk->cache_state = STATE_EMPTY;  in mtdblock_open()
265 		mtdblk->cache_size = mbd->mtd->erasesize;  in mtdblock_open()
266 		mtdblk->cache_data = NULL;  in mtdblock_open()
276 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_release()  local
280 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_release()
281 	write_cached_data(mtdblk);  in mtdblock_release()
282 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_release()
284 	if (!--mtdblk->count) {  in mtdblock_release()
291 		vfree(mtdblk->cache_data);  in mtdblock_release()
299 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_flush()  local
302 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_flush()
303 	ret = write_cached_data(mtdblk);  in mtdblock_flush()
304 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_flush()