3  *    character device frontend for tape device driver
63 tapechar_setup_device(struct tape_device * device)  in tapechar_setup_device()  argument
67 	sprintf(device_name, "ntibm%i", device->first_minor / 2);  in tapechar_setup_device()
68 	device->nt = register_tape_dev(  in tapechar_setup_device()
69 		&device->cdev->dev,  in tapechar_setup_device()
70 		MKDEV(tapechar_major, device->first_minor),  in tapechar_setup_device()
76 	device->rt = register_tape_dev(  in tapechar_setup_device()
77 		&device->cdev->dev,  in tapechar_setup_device()
78 		MKDEV(tapechar_major, device->first_minor + 1),  in tapechar_setup_device()
88 tapechar_cleanup_device(struct tape_device *device)  in tapechar_cleanup_device()  argument
90 	unregister_tape_dev(&device->cdev->dev, device->rt);  in tapechar_cleanup_device()
91 	device->rt = NULL;  in tapechar_cleanup_device()
92 	unregister_tape_dev(&device->cdev->dev, device->nt);  in tapechar_cleanup_device()
93 	device->nt = NULL;  in tapechar_cleanup_device()
97 tapechar_check_idalbuffer(struct tape_device *device, size_t block_size)  in tapechar_check_idalbuffer()  argument
101 	if (device->char_data.idal_buf != NULL &&  in tapechar_check_idalbuffer()
102 	    device->char_data.idal_buf->size == block_size)  in tapechar_check_idalbuffer()
116 	if (device->char_data.idal_buf != NULL)  in tapechar_check_idalbuffer()
117 		idal_buffer_free(device->char_data.idal_buf);  in tapechar_check_idalbuffer()
119 	device->char_data.idal_buf = new;  in tapechar_check_idalbuffer()
125  * Tape device read function
130 	struct tape_device *device;  in tapechar_read()  local
136 	device = (struct tape_device *) filp->private_data;  in tapechar_read()
143 	if(device->required_tapemarks) {  in tapechar_read()
144 		return tape_std_terminate_write(device);  in tapechar_read()
148 	if (device->char_data.block_size != 0) {  in tapechar_read()
149 		if (count < device->char_data.block_size) {  in tapechar_read()
154 		block_size = device->char_data.block_size;  in tapechar_read()
159 	rc = tapechar_check_idalbuffer(device, block_size);  in tapechar_read()
165 	request = device->discipline->read_block(device, block_size);  in tapechar_read()
169 	rc = tape_do_io(device, request);  in tapechar_read()
174 		if (idal_buffer_to_user(device->char_data.idal_buf,  in tapechar_read()
183  * Tape device write function
188 	struct tape_device *device;  in tapechar_write()  local
196 	device = (struct tape_device *) filp->private_data;  in tapechar_write()
198 	if (device->char_data.block_size != 0) {  in tapechar_write()
199 		if (count < device->char_data.block_size) {  in tapechar_write()
204 		block_size = device->char_data.block_size;  in tapechar_write()
211 	rc = tapechar_check_idalbuffer(device, block_size);  in tapechar_write()
218 	request = device->discipline->write_block(device, block_size);  in tapechar_write()
225 		if (idal_buffer_from_user(device->char_data.idal_buf,  in tapechar_write()
230 		rc = tape_do_io(device, request);  in tapechar_write()
243 		 * Ok, the device has no more space. It has NOT written  in tapechar_write()
246 		if (device->discipline->process_eov)  in tapechar_write()
247 			device->discipline->process_eov(device);  in tapechar_write()
261 		device->required_tapemarks = 2;  in tapechar_write()
267  * Character frontend tape device open function.
272 	struct tape_device *device;  in tapechar_open()  local
283 	device = tape_find_device(minor / TAPE_MINORS_PER_DEV);  in tapechar_open()
284 	if (IS_ERR(device)) {  in tapechar_open()
286 		return PTR_ERR(device);  in tapechar_open()
289 	rc = tape_open(device);  in tapechar_open()
291 		filp->private_data = device;  in tapechar_open()
294 		tape_put_device(device);  in tapechar_open()
300  * Character frontend tape device release function.
306 	struct tape_device *device;  in tapechar_release()  local
309 	device = (struct tape_device *) filp->private_data;  in tapechar_release()
317 		if (device->required_tapemarks)  in tapechar_release()
318 			tape_std_terminate_write(device);  in tapechar_release()
319 		tape_mtop(device, MTREW, 1);  in tapechar_release()
321 		if (device->required_tapemarks > 1) {  in tapechar_release()
322 			if (tape_mtop(device, MTWEOF, 1) == 0)  in tapechar_release()
323 				device->required_tapemarks--;  in tapechar_release()
327 	if (device->char_data.idal_buf != NULL) {  in tapechar_release()
328 		idal_buffer_free(device->char_data.idal_buf);  in tapechar_release()
329 		device->char_data.idal_buf = NULL;  in tapechar_release()
331 	tape_release(device);  in tapechar_release()
333 	tape_put_device(device);  in tapechar_release()
339  * Tape device io controls.
342 __tapechar_ioctl(struct tape_device *device,  in __tapechar_ioctl()  argument
371 				if (device->required_tapemarks)  in __tapechar_ioctl()
372 					tape_std_terminate_write(device);  in __tapechar_ioctl()
374 		rc = tape_mtop(device, op.mt_op, op.mt_count);  in __tapechar_ioctl()
377 			if (op.mt_count > device->required_tapemarks)  in __tapechar_ioctl()
378 				device->required_tapemarks = 0;  in __tapechar_ioctl()
380 				device->required_tapemarks -= op.mt_count;  in __tapechar_ioctl()
388 		rc = tape_mtop(device, MTTELL, 1);  in __tapechar_ioctl()
400 		get.mt_resid = 0 /* device->devstat.rescnt */;  in __tapechar_ioctl()
402 			((device->char_data.block_size << MT_ST_BLKSIZE_SHIFT)  in __tapechar_ioctl()
408 		get.mt_gstat  = device->tape_generic_status;  in __tapechar_ioctl()
410 		if (device->medium_state == MS_LOADED) {  in __tapechar_ioctl()
411 			rc = tape_mtop(device, MTTELL, 1);  in __tapechar_ioctl()
425 	if (device->discipline->ioctl_fn == NULL)  in __tapechar_ioctl()
427 	return device->discipline->ioctl_fn(device, no, (unsigned long)data);  in __tapechar_ioctl()
433 	struct tape_device *device;  in tapechar_ioctl()  local
438 	device = (struct tape_device *) filp->private_data;  in tapechar_ioctl()
439 	mutex_lock(&device->mutex);  in tapechar_ioctl()
440 	rc = __tapechar_ioctl(device, no, (void __user *)data);  in tapechar_ioctl()
441 	mutex_unlock(&device->mutex);  in tapechar_ioctl()
449 	struct tape_device *device = filp->private_data;  in tapechar_compat_ioctl()  local
457 	mutex_lock(&device->mutex);  in tapechar_compat_ioctl()
458 	rc = __tapechar_ioctl(device, no, compat_ptr(data));  in tapechar_compat_ioctl()
459 	mutex_unlock(&device->mutex);  in tapechar_compat_ioctl()
465  * Initialize character device frontend.