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()
102 	mtdblk->cache_state = STATE_EMPTY;  in write_cached_data()
107 static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_write()  argument
110 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_write()
111 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_write()
140 			if (mtdblk->cache_state == STATE_DIRTY &&  in do_cached_write()
141 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
142 				ret = write_cached_data(mtdblk);  in do_cached_write()
147 			if (mtdblk->cache_state == STATE_EMPTY ||  in do_cached_write()
148 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
150 				mtdblk->cache_state = STATE_EMPTY;  in do_cached_write()
152 					       &retlen, mtdblk->cache_data);  in do_cached_write()
158 				mtdblk->cache_offset = sect_start;  in do_cached_write()
159 				mtdblk->cache_size = sect_size;  in do_cached_write()
160 				mtdblk->cache_state = STATE_CLEAN;  in do_cached_write()
164 			memcpy (mtdblk->cache_data + offset, buf, size);  in do_cached_write()
165 			mtdblk->cache_state = STATE_DIRTY;  in do_cached_write()
177 static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,  in do_cached_read()  argument
180 	struct mtd_info *mtd = mtdblk->mbd.mtd;  in do_cached_read()
181 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_read()
204 		if (mtdblk->cache_state != STATE_EMPTY &&  in do_cached_read()
205 		    mtdblk->cache_offset == sect_start) {  in do_cached_read()
206 			memcpy (buf, mtdblk->cache_data + offset, size);  in do_cached_read()
226 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_readsect()  local
227 	return do_cached_read(mtdblk, block<<9, 512, buf);  in mtdblock_readsect()
233 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_writesect()  local
234 	if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {  in mtdblock_writesect()
235 		mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);  in mtdblock_writesect()
236 		if (!mtdblk->cache_data)  in mtdblock_writesect()
243 	return do_cached_write(mtdblk, block<<9, 512, buf);  in mtdblock_writesect()
248 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_open()  local
252 	if (mtdblk->count) {  in mtdblock_open()
253 		mtdblk->count++;  in mtdblock_open()
258 	mtdblk->count = 1;  in mtdblock_open()
259 	mutex_init(&mtdblk->cache_mutex);  in mtdblock_open()
260 	mtdblk->cache_state = STATE_EMPTY;  in mtdblock_open()
262 		mtdblk->cache_size = mbd->mtd->erasesize;  in mtdblock_open()
263 		mtdblk->cache_data = NULL;  in mtdblock_open()
273 	struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);  in mtdblock_release()  local
277 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_release()
278 	write_cached_data(mtdblk);  in mtdblock_release()
279 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_release()
281 	if (!--mtdblk->count) {  in mtdblock_release()
288 		vfree(mtdblk->cache_data);  in mtdblock_release()
296 	struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);  in mtdblock_flush()  local
298 	mutex_lock(&mtdblk->cache_mutex);  in mtdblock_flush()
299 	write_cached_data(mtdblk);  in mtdblock_flush()
300 	mutex_unlock(&mtdblk->cache_mutex);  in mtdblock_flush()