tape_std.c

linux-2.6.15.6

	return tape_do_io_free(device, request);
}

/*
 * MTBSFM: Backward space over 'count' file marks.
 * The tape is positioned at the BOT (Begin Of Tape) side of the
 * last skipped file mark.
 */
int
tape_std_mtbsfm(struct tape_device *device, int mt_count)
{
	struct tape_request *request;
	struct ccw1 *ccw;

	request = tape_alloc_request(mt_count + 2, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_BSF;
	/* setup ccws */
	ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1,
			  device->modeset_byte);
	ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count);
	ccw = tape_ccw_end(ccw, NOP, 0, NULL);

	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * MTBSF: Backward space over 'count' file marks. The tape is positioned at
 * the EOT (End of Tape) side of the last skipped file mark.
 */
int
tape_std_mtbsf(struct tape_device *device, int mt_count)
{
	struct tape_request *request;
	struct ccw1 *ccw;
	int rc;

	request = tape_alloc_request(mt_count + 2, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_BSF;
	/* setup ccws */
	ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1,
			  device->modeset_byte);
	ccw = tape_ccw_repeat(ccw, BACKSPACEFILE, mt_count);
	ccw = tape_ccw_end(ccw, NOP, 0, NULL);
	/* execute it */
	rc = tape_do_io_free(device, request);
	if (rc == 0) {
		rc = tape_mtop(device, MTFSR, 1);
		if (rc > 0)
			rc = 0;
	}
	return rc;
}

/*
 * MTFSFM: Forward space over 'count' file marks.
 * The tape is positioned at the BOT (Begin Of Tape) side
 * of the last skipped file mark.
 */
int
tape_std_mtfsfm(struct tape_device *device, int mt_count)
{
	struct tape_request *request;
	struct ccw1 *ccw;
	int rc;

	request = tape_alloc_request(mt_count + 2, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_FSF;
	/* setup ccws */
	ccw = tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1,
			  device->modeset_byte);
	ccw = tape_ccw_repeat(ccw, FORSPACEFILE, mt_count);
	ccw = tape_ccw_end(ccw, NOP, 0, NULL);
	/* execute it */
	rc = tape_do_io_free(device, request);
	if (rc == 0) {
		rc = tape_mtop(device, MTBSR, 1);
		if (rc > 0)
			rc = 0;
	}

	return rc;
}

/*
 * MTREW: Rewind the tape.
 */
int
tape_std_mtrew(struct tape_device *device, int mt_count)
{
	struct tape_request *request;

	request = tape_alloc_request(3, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_REW;
	/* setup ccws */
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1,
		    device->modeset_byte);
	tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL);
	tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);

	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * MTOFFL: Rewind the tape and put the drive off-line.
 * Implement 'rewind unload'
 */
int
tape_std_mtoffl(struct tape_device *device, int mt_count)
{
	struct tape_request *request;

	request = tape_alloc_request(3, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_RUN;
	/* setup ccws */
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_cc(request->cpaddr + 1, REWIND_UNLOAD, 0, NULL);
	tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);

	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * MTNOP: 'No operation'.
 */
int
tape_std_mtnop(struct tape_device *device, int mt_count)
{
	struct tape_request *request;

	request = tape_alloc_request(2, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_NOP;
	/* setup ccws */
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL);
	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * MTEOM: positions at the end of the portion of the tape already used
 * for recordind data. MTEOM positions after the last file mark, ready for
 * appending another file.
 */
int
tape_std_mteom(struct tape_device *device, int mt_count)
{
	int rc;

	/*
	 * Seek from the beginning of tape (rewind).
	 */
	if ((rc = tape_mtop(device, MTREW, 1)) < 0)
		return rc;

	/*
	 * The logical end of volume is given by two sewuential tapemarks.
	 * Look for this by skipping to the next file (over one tapemark)
	 * and then test for another one (fsr returns 1 if a tapemark was
	 * encountered).
	 */
	do {
		if ((rc = tape_mtop(device, MTFSF, 1)) < 0)
			return rc;
		if ((rc = tape_mtop(device, MTFSR, 1)) < 0)
			return rc;
	} while (rc == 0);

	return tape_mtop(device, MTBSR, 1);
}

/*
 * MTRETEN: Retension the tape, i.e. forward space to end of tape and rewind.
 */
int
tape_std_mtreten(struct tape_device *device, int mt_count)
{
	struct tape_request *request;
	int rc;

	request = tape_alloc_request(4, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_FSF;
	/* setup ccws */
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_cc(request->cpaddr + 1,FORSPACEFILE, 0, NULL);
	tape_ccw_cc(request->cpaddr + 2, NOP, 0, NULL);
	tape_ccw_end(request->cpaddr + 3, CCW_CMD_TIC, 0, request->cpaddr);
	/* execute it, MTRETEN rc gets ignored */
	rc = tape_do_io_interruptible(device, request);
	tape_free_request(request);
	return tape_mtop(device, MTREW, 1);
}

/*
 * MTERASE: erases the tape.
 */
int
tape_std_mterase(struct tape_device *device, int mt_count)
{
	struct tape_request *request;

	request = tape_alloc_request(6, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_DSE;
	/* setup ccws */
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_cc(request->cpaddr + 1, REWIND, 0, NULL);
	tape_ccw_cc(request->cpaddr + 2, ERASE_GAP, 0, NULL);
	tape_ccw_cc(request->cpaddr + 3, DATA_SEC_ERASE, 0, NULL);
	tape_ccw_cc(request->cpaddr + 4, REWIND, 0, NULL);
	tape_ccw_end(request->cpaddr + 5, NOP, 0, NULL);

	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * MTUNLOAD: Rewind the tape and unload it.
 */
int
tape_std_mtunload(struct tape_device *device, int mt_count)
{
	return tape_mtop(device, MTOFFL, mt_count);
}

/*
 * MTCOMPRESSION: used to enable compression.
 * Sets the IDRC on/off.
 */
int
tape_std_mtcompression(struct tape_device *device, int mt_count)
{
	struct tape_request *request;

	if (mt_count < 0 || mt_count > 1) {
		DBF_EXCEPTION(6, "xcom parm\n");
		if (*device->modeset_byte & 0x08)
			PRINT_INFO("(%s) Compression is currently on\n",
				   device->cdev->dev.bus_id);
		else
			PRINT_INFO("(%s) Compression is currently off\n",
				   device->cdev->dev.bus_id);
		PRINT_INFO("Use 1 to switch compression on, 0 to "
			   "switch it off\n");
		return -EINVAL;
	}
	request = tape_alloc_request(2, 0);
	if (IS_ERR(request))
		return PTR_ERR(request);
	request->op = TO_NOP;
	/* setup ccws */
	*device->modeset_byte = (mt_count == 0) ? 0x00 : 0x08;
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_end(request->cpaddr + 1, NOP, 0, NULL);
	/* execute it */
	return tape_do_io_free(device, request);
}

/*
 * Read Block
 */
struct tape_request *
tape_std_read_block(struct tape_device *device, size_t count)
{
	struct tape_request *request;

	/*
	 * We have to alloc 4 ccws in order to be able to transform request
	 * into a read backward request in error case.
	 */
	request = tape_alloc_request(4, 0);
	if (IS_ERR(request)) {
		DBF_EXCEPTION(6, "xrbl fail");
		return request;
	}
	request->op = TO_RFO;
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_end_idal(request->cpaddr + 1, READ_FORWARD,
			  device->char_data.idal_buf);
	DBF_EVENT(6, "xrbl ccwg\n");
	return request;
}

/*
 * Read Block backward transformation function.
 */
void
tape_std_read_backward(struct tape_device *device, struct tape_request *request)
{
	/*
	 * We have allocated 4 ccws in tape_std_read, so we can now
	 * transform the request to a read backward, followed by a
	 * forward space block.
	 */
	request->op = TO_RBA;
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_cc_idal(request->cpaddr + 1, READ_BACKWARD,
			 device->char_data.idal_buf);
	tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
	tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
	DBF_EVENT(6, "xrop ccwg");}

/*
 * Write Block
 */
struct tape_request *
tape_std_write_block(struct tape_device *device, size_t count)
{
	struct tape_request *request;

	request = tape_alloc_request(2, 0);
	if (IS_ERR(request)) {
		DBF_EXCEPTION(6, "xwbl fail\n");
		return request;
	}
	request->op = TO_WRI;
	tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
	tape_ccw_end_idal(request->cpaddr + 1, WRITE_CMD,
			  device->char_data.idal_buf);
	DBF_EVENT(6, "xwbl ccwg\n");
	return request;
}

/*
 * This routine is called by frontend after an ENOSP on write
 */
void
tape_std_process_eov(struct tape_device *device)
{
	/*
	 * End of volume: We have to backspace the last written record, then
	 * we TRY to write a tapemark and then backspace over the written TM
	 */
	if (tape_mtop(device, MTBSR, 1) == 0 &&
	    tape_mtop(device, MTWEOF, 1) == 0) {
		tape_mtop(device, MTBSR, 1);
	}
}

EXPORT_SYMBOL(tape_std_assign);
EXPORT_SYMBOL(tape_std_unassign);
EXPORT_SYMBOL(tape_std_display);
EXPORT_SYMBOL(tape_std_read_block_id);
EXPORT_SYMBOL(tape_std_mtload);
EXPORT_SYMBOL(tape_std_mtsetblk);
EXPORT_SYMBOL(tape_std_mtreset);
EXPORT_SYMBOL(tape_std_mtfsf);
EXPORT_SYMBOL(tape_std_mtfsr);
EXPORT_SYMBOL(tape_std_mtbsr);
EXPORT_SYMBOL(tape_std_mtweof);
EXPORT_SYMBOL(tape_std_mtbsfm);
EXPORT_SYMBOL(tape_std_mtbsf);
EXPORT_SYMBOL(tape_std_mtfsfm);
EXPORT_SYMBOL(tape_std_mtrew);
EXPORT_SYMBOL(tape_std_mtoffl);
EXPORT_SYMBOL(tape_std_mtnop);
EXPORT_SYMBOL(tape_std_mteom);
EXPORT_SYMBOL(tape_std_mtreten);
EXPORT_SYMBOL(tape_std_mterase);
EXPORT_SYMBOL(tape_std_mtunload);
EXPORT_SYMBOL(tape_std_mtcompression);
EXPORT_SYMBOL(tape_std_read_block);
EXPORT_SYMBOL(tape_std_read_backward);
EXPORT_SYMBOL(tape_std_write_block);
EXPORT_SYMBOL(tape_std_process_eov);