136 static int write_cached_data (struct mtdblk_dev *mtdblk)  in write_cached_data()  argument
138 	struct mtd_info *mtd = mtdblk->mtd;  in write_cached_data()
141 	if (mtdblk->cache_state != STATE_DIRTY)  in write_cached_data()
146 			mtdblk->cache_offset, mtdblk->cache_size);  in write_cached_data()
148 	ret = erase_write (mtd, mtdblk->cache_offset,   in write_cached_data()
149 			   mtdblk->cache_size, mtdblk->cache_data);  in write_cached_data()
160 	mtdblk->cache_state = STATE_EMPTY;  in write_cached_data()
165 static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,   in do_cached_write()  argument
168 	struct mtd_info *mtd = mtdblk->mtd;  in do_cached_write()
169 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_write()
198 			if (mtdblk->cache_state == STATE_DIRTY &&  in do_cached_write()
199 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
200 				ret = write_cached_data(mtdblk);  in do_cached_write()
205 			if (mtdblk->cache_state == STATE_EMPTY ||  in do_cached_write()
206 			    mtdblk->cache_offset != sect_start) {  in do_cached_write()
208 				mtdblk->cache_state = STATE_EMPTY;  in do_cached_write()
209 				ret = MTD_READ(mtd, sect_start, sect_size, &retlen, mtdblk->cache_data);  in do_cached_write()
215 				mtdblk->cache_offset = sect_start;  in do_cached_write()
216 				mtdblk->cache_size = sect_size;  in do_cached_write()
217 				mtdblk->cache_state = STATE_CLEAN;  in do_cached_write()
221 			memcpy (mtdblk->cache_data + offset, buf, size);  in do_cached_write()
222 			mtdblk->cache_state = STATE_DIRTY;  in do_cached_write()
234 static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,   in do_cached_read()  argument
237 	struct mtd_info *mtd = mtdblk->mtd;  in do_cached_read()
238 	unsigned int sect_size = mtdblk->cache_size;  in do_cached_read()
261 		if (mtdblk->cache_state != STATE_EMPTY &&  in do_cached_read()
262 		    mtdblk->cache_offset == sect_start) {  in do_cached_read()
263 			memcpy (buf, mtdblk->cache_data + offset, size);  in do_cached_read()
284 	struct mtdblk_dev *mtdblk;  in mtdblock_open()  local
325 	mtdblk = kmalloc(sizeof(struct mtdblk_dev), GFP_KERNEL);  in mtdblock_open()
326 	if (!mtdblk) {  in mtdblock_open()
331 	memset(mtdblk, 0, sizeof(*mtdblk));  in mtdblock_open()
332 	mtdblk->count = 1;  in mtdblock_open()
333 	mtdblk->mtd = mtd;  in mtdblock_open()
335 	init_MUTEX (&mtdblk->cache_sem);  in mtdblock_open()
336 	mtdblk->cache_state = STATE_EMPTY;  in mtdblock_open()
337 	if ((mtdblk->mtd->flags & MTD_CAP_RAM) != MTD_CAP_RAM &&  in mtdblock_open()
338 	    mtdblk->mtd->erasesize) {  in mtdblock_open()
339 		mtdblk->cache_size = mtdblk->mtd->erasesize;  in mtdblock_open()
340 		mtdblk->cache_data = vmalloc(mtdblk->mtd->erasesize);  in mtdblock_open()
341 		if (!mtdblk->cache_data) {  in mtdblock_open()
342 			put_mtd_device(mtdblk->mtd);  in mtdblock_open()
343 			kfree(mtdblk);  in mtdblock_open()
357 		put_mtd_device(mtdblk->mtd);  in mtdblock_open()
358 		vfree(mtdblk->cache_data);  in mtdblock_open()
359 		kfree(mtdblk);  in mtdblock_open()
363 	mtdblks[dev] = mtdblk;  in mtdblock_open()
364 	mtd_sizes[dev] = mtdblk->mtd->size/1024;  in mtdblock_open()
365 	if (mtdblk->mtd->erasesize)  in mtdblock_open()
366 		mtd_blksizes[dev] = mtdblk->mtd->erasesize;  in mtdblock_open()
369 	set_device_ro (inode->i_rdev, !(mtdblk->mtd->flags & MTD_WRITEABLE));  in mtdblock_open()
381 	struct mtdblk_dev *mtdblk;  in mtdblock_release()  local
388 	mtdblk = mtdblks[dev];  in mtdblock_release()
390 	down(&mtdblk->cache_sem);  in mtdblock_release()
391 	write_cached_data(mtdblk);  in mtdblock_release()
392 	up(&mtdblk->cache_sem);  in mtdblock_release()
395 	if (!--mtdblk->count) {  in mtdblock_release()
399 		if (mtdblk->mtd->sync)  in mtdblock_release()
400 			mtdblk->mtd->sync(mtdblk->mtd);  in mtdblock_release()
401 		put_mtd_device(mtdblk->mtd);  in mtdblock_release()
402 		vfree(mtdblk->cache_data);  in mtdblock_release()
403 		kfree(mtdblk);  in mtdblock_release()
425 	struct mtdblk_dev *mtdblk;  in handle_mtdblock_request()  local
432 		mtdblk = mtdblks[MINOR(req->rq_dev)];  in handle_mtdblock_request()
438 		if ((req->sector + req->current_nr_sectors) > (mtdblk->mtd->size >> 9))  in handle_mtdblock_request()
447 			down(&mtdblk->cache_sem);  in handle_mtdblock_request()
448 			err = do_cached_read (mtdblk, req->sector << 9,   in handle_mtdblock_request()
451 			up(&mtdblk->cache_sem);  in handle_mtdblock_request()
458 			if ( !(mtdblk->mtd->flags & MTD_WRITEABLE) )   in handle_mtdblock_request()
462 			down(&mtdblk->cache_sem);  in handle_mtdblock_request()
463 			err = do_cached_write (mtdblk, req->sector << 9,  in handle_mtdblock_request()
466 			up(&mtdblk->cache_sem);  in handle_mtdblock_request()
532 	struct mtdblk_dev *mtdblk;  in mtdblock_ioctl()  local
534 	mtdblk = mtdblks[MINOR(inode->i_rdev)];  in mtdblock_ioctl()
537 	if (!mtdblk)  in mtdblock_ioctl()
543 		return put_user((mtdblk->mtd->size >> 9), (unsigned long *) arg);  in mtdblock_ioctl()
547 		return put_user((u64)mtdblk->mtd->size, (u64 *)arg);  in mtdblock_ioctl()
557 		down(&mtdblk->cache_sem);  in mtdblock_ioctl()
558 		write_cached_data(mtdblk);  in mtdblock_ioctl()
559 		up(&mtdblk->cache_sem);  in mtdblock_ioctl()
560 		if (mtdblk->mtd->sync)  in mtdblock_ioctl()
561 			mtdblk->mtd->sync(mtdblk->mtd);  in mtdblock_ioctl()