92 static int write_cached_data (struct mtdblk_dev *mtdblk)  in write_cached_data()  argument
94 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in write_cached_data()
97 	if (mtdblk->cache_state != STATE_DIRTY)  in write_cached_data()
102 			mtdblk->cache_offset, mtdblk->cache_size);  in write_cached_data()
104 	ret = erase_write (mtd, mtdblk->cache_offset,  in write_cached_data()
105 			   mtdblk->cache_size, mtdblk->cache_data);  in write_cached_data()
116 	mtdblk->cache_state = STATE_EMPTY;  in write_cached_data()
121 static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_write()  argument
124 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_write()
125 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_write()
154 			if (mtdblk->cache_state == STATE_DIRTY &&  in do_cached_write()
155 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
156 				ret = write_cached_data(mtdblk);  in do_cached_write()
161 			if (mtdblk->cache_state == STATE_EMPTY ||  in do_cached_write()
162 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
164 				mtdblk->cache_state = STATE_EMPTY;  in do_cached_write()
166 					       &retlen, mtdblk->cache_data);  in do_cached_write()
172 				mtdblk->cache_offset = sect_start;  in do_cached_write()
173 				mtdblk->cache_size = sect_size;  in do_cached_write()
174 				mtdblk->cache_state = STATE_CLEAN;  in do_cached_write()
178 			memcpy (mtdblk->cache_data + offset, buf, size);  in do_cached_write()
179 			mtdblk->cache_state = STATE_DIRTY;  in do_cached_write()
191 static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_read()  argument
194 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_read()
195 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_read()
218 		if (mtdblk->cache_state != STATE_EMPTY &&  in do_cached_read()
219 		    mtdblk->cache_offset == sect_start) {  in do_cached_read()
220 			memcpy (buf, mtdblk->cache_data + offset, size);  in do_cached_read()
240 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_readsect()  local
241 	return do_cached_read(mtdblk, block<<9, 512, buf);  in mtdblock_readsect()
247 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_writesect()  local
248 	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {  in mtdblock_writesect()
249 		mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);  in mtdblock_writesect()
250 		if (!mtdblk->cache_data)  in mtdblock_writesect()
257 	return do_cached_write(mtdblk, block<<9, 512, buf);  in mtdblock_writesect()
262 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_open()  local
266 	if (mtdblk->count) {  in mtdblock_open()
267 		mtdblk->count++;  in mtdblock_open()
272 	mtdblk->count = 1;  in mtdblock_open()
273 	mutex_init(&mtdblk->cache_mutex);  in mtdblock_open()
274 	mtdblk->cache_state = STATE_EMPTY;  in mtdblock_open()
276 		mtdblk->cache_size = mbd->mtd->erasesize;  in mtdblock_open()
277 		mtdblk->cache_data = NULL;  in mtdblock_open()
287 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_release()  local
291 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_release()
292 	write_cached_data(mtdblk);  in mtdblock_release()
293 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_release()
295 	if (!--mtdblk->count) {  in mtdblock_release()
302 		vfree(mtdblk->cache_data);  in mtdblock_release()
310 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_flush()  local
312 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_flush()
313 	write_cached_data(mtdblk);  in mtdblock_flush()
314 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_flush()