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()
211 		if (mtdblk->cache_state != STATE_EMPTY &&  in do_cached_read()
212 		    mtdblk->cache_offset == sect_start) {  in do_cached_read()
213 			memcpy (buf, mtdblk->cache_data + offset, size);  in do_cached_read()
233 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_readsect()  local
234 	return do_cached_read(mtdblk, block<<9, 512, buf);  in mtdblock_readsect()
240 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_writesect()  local
241 	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {  in mtdblock_writesect()
242 		mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);  in mtdblock_writesect()
243 		if (!mtdblk->cache_data)  in mtdblock_writesect()
250 	return do_cached_write(mtdblk, block<<9, 512, buf);  in mtdblock_writesect()
255 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_open()  local
259 	if (mtdblk->count) {  in mtdblock_open()
260 		mtdblk->count++;  in mtdblock_open()
269 	mtdblk->count = 1;  in mtdblock_open()
270 	mutex_init(&mtdblk->cache_mutex);  in mtdblock_open()
271 	mtdblk->cache_state = STATE_EMPTY;  in mtdblock_open()
273 		mtdblk->cache_size = mbd->mtd->erasesize;  in mtdblock_open()
274 		mtdblk->cache_data = NULL;  in mtdblock_open()
284 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_release()  local
288 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_release()
289 	write_cached_data(mtdblk);  in mtdblock_release()
290 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_release()
292 	if (!--mtdblk->count) {  in mtdblock_release()
299 		vfree(mtdblk->cache_data);  in mtdblock_release()
307 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_flush()  local
310 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_flush()
311 	ret = write_cached_data(mtdblk);  in mtdblock_flush()
312 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_flush()