scsi_ioctl.c 18 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
/*
 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public Licens
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-
 *
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/capability.h>
#include <linux/completion.h>
#include <linux/cdrom.h>
#include <linux/slab.h>
#include <linux/times.h>
#include <asm/uaccess.h>

#include <scsi/scsi.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_cmnd.h>

struct blk_cmd_filter {
	unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
	unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
} blk_default_cmd_filter;

/* Command group 3 is reserved and should never be used.  */
const unsigned char scsi_command_size_tbl[8] =
{
	6, 10, 10, 12,
	16, 12, 10, 10
};
EXPORT_SYMBOL(scsi_command_size_tbl);

#include <scsi/sg.h>

static int sg_get_version(int __user *p)
{
	static const int sg_version_num = 30527;
	return put_user(sg_version_num, p);
}

static int scsi_get_idlun(struct request_queue *q, int __user *p)
{
	return put_user(0, p);
}

static int scsi_get_bus(struct request_queue *q, int __user *p)
{
	return put_user(0, p);
}

static int sg_get_timeout(struct request_queue *q)
{
	return jiffies_to_clock_t(q->sg_timeout);
}

static int sg_set_timeout(struct request_queue *q, int __user *p)
{
	int timeout, err = get_user(timeout, p);

	if (!err)
		q->sg_timeout = clock_t_to_jiffies(timeout);

	return err;
}

static int sg_get_reserved_size(struct request_queue *q, int __user *p)
{
	unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);

	return put_user(val, p);
}

static int sg_set_reserved_size(struct request_queue *q, int __user *p)
{
	int size, err = get_user(size, p);

	if (err)
		return err;

	if (size < 0)
		return -EINVAL;
	if (size > (queue_max_sectors(q) << 9))
		size = queue_max_sectors(q) << 9;

	q->sg_reserved_size = size;
	return 0;
}

/*
 * will always return that we are ATAPI even for a real SCSI drive, I'm not
 * so sure this is worth doing anything about (why would you care??)
 */
static int sg_emulated_host(struct request_queue *q, int __user *p)
{
	return put_user(1, p);
}

static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
{
	/* Basic read-only commands */
	__set_bit(TEST_UNIT_READY, filter->read_ok);
	__set_bit(REQUEST_SENSE, filter->read_ok);
	__set_bit(READ_6, filter->read_ok);
	__set_bit(READ_10, filter->read_ok);
	__set_bit(READ_12, filter->read_ok);
	__set_bit(READ_16, filter->read_ok);
	__set_bit(READ_BUFFER, filter->read_ok);
	__set_bit(READ_DEFECT_DATA, filter->read_ok);
	__set_bit(READ_CAPACITY, filter->read_ok);
	__set_bit(READ_LONG, filter->read_ok);
	__set_bit(INQUIRY, filter->read_ok);
	__set_bit(MODE_SENSE, filter->read_ok);
	__set_bit(MODE_SENSE_10, filter->read_ok);
	__set_bit(LOG_SENSE, filter->read_ok);
	__set_bit(START_STOP, filter->read_ok);
	__set_bit(GPCMD_VERIFY_10, filter->read_ok);
	__set_bit(VERIFY_16, filter->read_ok);
	__set_bit(REPORT_LUNS, filter->read_ok);
	__set_bit(SERVICE_ACTION_IN, filter->read_ok);
	__set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
	__set_bit(MAINTENANCE_IN, filter->read_ok);
	__set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);

	/* Audio CD commands */
	__set_bit(GPCMD_PLAY_CD, filter->read_ok);
	__set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
	__set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
	__set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
	__set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);

	/* CD/DVD data reading */
	__set_bit(GPCMD_READ_CD, filter->read_ok);
	__set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
	__set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
	__set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
	__set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
	__set_bit(GPCMD_READ_HEADER, filter->read_ok);
	__set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
	__set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
	__set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
	__set_bit(GPCMD_REPORT_KEY, filter->read_ok);
	__set_bit(GPCMD_SCAN, filter->read_ok);
	__set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
	__set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
	__set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
	__set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
	__set_bit(GPCMD_SEEK, filter->read_ok);
	__set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);

	/* Basic writing commands */
	__set_bit(WRITE_6, filter->write_ok);
	__set_bit(WRITE_10, filter->write_ok);
	__set_bit(WRITE_VERIFY, filter->write_ok);
	__set_bit(WRITE_12, filter->write_ok);
	__set_bit(WRITE_VERIFY_12, filter->write_ok);
	__set_bit(WRITE_16, filter->write_ok);
	__set_bit(WRITE_LONG, filter->write_ok);
	__set_bit(WRITE_LONG_2, filter->write_ok);
	__set_bit(ERASE, filter->write_ok);
	__set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
	__set_bit(MODE_SELECT, filter->write_ok);
	__set_bit(LOG_SELECT, filter->write_ok);
	__set_bit(GPCMD_BLANK, filter->write_ok);
	__set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
	__set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
	__set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
	__set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
	__set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
	__set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
	__set_bit(GPCMD_SEND_EVENT, filter->write_ok);
	__set_bit(GPCMD_SEND_KEY, filter->write_ok);
	__set_bit(GPCMD_SEND_OPC, filter->write_ok);
	__set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
	__set_bit(GPCMD_SET_SPEED, filter->write_ok);
	__set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
	__set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
	__set_bit(GPCMD_SET_STREAMING, filter->write_ok);
	__set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
}

int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
{
	struct blk_cmd_filter *filter = &blk_default_cmd_filter;

	/* root can do any command. */
	if (capable(CAP_SYS_RAWIO))
		return 0;

	/* if there's no filter set, assume we're filtering everything out */
	if (!filter)
		return -EPERM;

	/* Anybody who can open the device can do a read-safe command */
	if (test_bit(cmd[0], filter->read_ok))
		return 0;

	/* Write-safe commands require a writable open */
	if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
		return 0;

	return -EPERM;
}
EXPORT_SYMBOL(blk_verify_command);

static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
			     struct sg_io_hdr *hdr, fmode_t mode)
{
	if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
		return -EFAULT;
	if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
		return -EPERM;

	/*
	 * fill in request structure
	 */
	rq->cmd_len = hdr->cmd_len;
	rq->cmd_type = REQ_TYPE_BLOCK_PC;

	rq->timeout = msecs_to_jiffies(hdr->timeout);
	if (!rq->timeout)
		rq->timeout = q->sg_timeout;
	if (!rq->timeout)
		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
	if (rq->timeout < BLK_MIN_SG_TIMEOUT)
		rq->timeout = BLK_MIN_SG_TIMEOUT;

	return 0;
}

static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
				 struct bio *bio)
{
	int r, ret = 0;

	/*
	 * fill in all the output members
	 */
	hdr->status = rq->errors & 0xff;
	hdr->masked_status = status_byte(rq->errors);
	hdr->msg_status = msg_byte(rq->errors);
	hdr->host_status = host_byte(rq->errors);
	hdr->driver_status = driver_byte(rq->errors);
	hdr->info = 0;
	if (hdr->masked_status || hdr->host_status || hdr->driver_status)
		hdr->info |= SG_INFO_CHECK;
	hdr->resid = rq->resid_len;
	hdr->sb_len_wr = 0;

	if (rq->sense_len && hdr->sbp) {
		int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);

		if (!copy_to_user(hdr->sbp, rq->sense, len))
			hdr->sb_len_wr = len;
		else
			ret = -EFAULT;
	}

	r = blk_rq_unmap_user(bio);
	if (!ret)
		ret = r;
	blk_put_request(rq);

	return ret;
}

static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
		struct sg_io_hdr *hdr, fmode_t mode)
{
	unsigned long start_time;
	int writing = 0, ret = 0;
	struct request *rq;
	char sense[SCSI_SENSE_BUFFERSIZE];
	struct bio *bio;

	if (hdr->interface_id != 'S')
		return -EINVAL;
	if (hdr->cmd_len > BLK_MAX_CDB)
		return -EINVAL;

	if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
		return -EIO;

	if (hdr->dxfer_len)
		switch (hdr->dxfer_direction) {
		default:
			return -EINVAL;
		case SG_DXFER_TO_DEV:
			writing = 1;
			break;
		case SG_DXFER_TO_FROM_DEV:
		case SG_DXFER_FROM_DEV:
			break;
		}

	rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
	if (!rq)
		return -ENOMEM;

	if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
		blk_put_request(rq);
		return -EFAULT;
	}

	if (hdr->iovec_count) {
		const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
		size_t iov_data_len;
		struct sg_iovec *iov;

		iov = kmalloc(size, GFP_KERNEL);
		if (!iov) {
			ret = -ENOMEM;
			goto out;
		}

		if (copy_from_user(iov, hdr->dxferp, size)) {
			kfree(iov);
			ret = -EFAULT;
			goto out;
		}

		/* SG_IO howto says that the shorter of the two wins */
		iov_data_len = iov_length((struct iovec *)iov,
					  hdr->iovec_count);
		if (hdr->dxfer_len < iov_data_len) {
			hdr->iovec_count = iov_shorten((struct iovec *)iov,
						       hdr->iovec_count,
						       hdr->dxfer_len);
			iov_data_len = hdr->dxfer_len;
		}

		ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
					  iov_data_len, GFP_KERNEL);
		kfree(iov);
	} else if (hdr->dxfer_len)
		ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
				      GFP_KERNEL);

	if (ret)
		goto out;

	bio = rq->bio;
	memset(sense, 0, sizeof(sense));
	rq->sense = sense;
	rq->sense_len = 0;
	rq->retries = 0;

	start_time = jiffies;

	/* ignore return value. All information is passed back to caller
	 * (if he doesn't check that is his problem).
	 * N.B. a non-zero SCSI status is _not_ necessarily an error.
	 */
	blk_execute_rq(q, bd_disk, rq, 0);

	hdr->duration = jiffies_to_msecs(jiffies - start_time);

	return blk_complete_sghdr_rq(rq, hdr, bio);
out:
	blk_put_request(rq);
	return ret;
}

/**
 * sg_scsi_ioctl  --  handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
 * @file:	file this ioctl operates on (optional)
 * @q:		request queue to send scsi commands down
 * @disk:	gendisk to operate on (option)
 * @sic:	userspace structure describing the command to perform
 *
 * Send down the scsi command described by @sic to the device below
 * the request queue @q.  If @file is non-NULL it's used to perform
 * fine-grained permission checks that allow users to send down
 * non-destructive SCSI commands.  If the caller has a struct gendisk
 * available it should be passed in as @disk to allow the low level
 * driver to use the information contained in it.  A non-NULL @disk
 * is only allowed if the caller knows that the low level driver doesn't
 * need it (e.g. in the scsi subsystem).
 *
 * Notes:
 *   -  This interface is deprecated - users should use the SG_IO
 *      interface instead, as this is a more flexible approach to
 *      performing SCSI commands on a device.
 *   -  The SCSI command length is determined by examining the 1st byte
 *      of the given command. There is no way to override this.
 *   -  Data transfers are limited to PAGE_SIZE
 *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
 *      accommodate the sense buffer when an error occurs.
 *      The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
 *      old code will not be surprised.
 *   -  If a Unix error occurs (e.g. ENOMEM) then the user will receive
 *      a negative return and the Unix error code in 'errno'.
 *      If the SCSI command succeeds then 0 is returned.
 *      Positive numbers returned are the compacted SCSI error codes (4
 *      bytes in one int) where the lowest byte is the SCSI status.
 */
#define OMAX_SB_LEN 16          /* For backward compatibility */
int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
		struct scsi_ioctl_command __user *sic)
{
	struct request *rq;
	int err;
	unsigned int in_len, out_len, bytes, opcode, cmdlen;
	char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];

	if (!sic)
		return -EINVAL;

	/*
	 * get in an out lengths, verify they don't exceed a page worth of data
	 */
	if (get_user(in_len, &sic->inlen))
		return -EFAULT;
	if (get_user(out_len, &sic->outlen))
		return -EFAULT;
	if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
		return -EINVAL;
	if (get_user(opcode, sic->data))
		return -EFAULT;

	bytes = max(in_len, out_len);
	if (bytes) {
		buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
		if (!buffer)
			return -ENOMEM;

	}

	rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);

	cmdlen = COMMAND_SIZE(opcode);

	/*
	 * get command and data to send to device, if any
	 */
	err = -EFAULT;
	rq->cmd_len = cmdlen;
	if (copy_from_user(rq->cmd, sic->data, cmdlen))
		goto error;

	if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
		goto error;

	err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
	if (err)
		goto error;

	/* default.  possible overriden later */
	rq->retries = 5;

	switch (opcode) {
	case SEND_DIAGNOSTIC:
	case FORMAT_UNIT:
		rq->timeout = FORMAT_UNIT_TIMEOUT;
		rq->retries = 1;
		break;
	case START_STOP:
		rq->timeout = START_STOP_TIMEOUT;
		break;
	case MOVE_MEDIUM:
		rq->timeout = MOVE_MEDIUM_TIMEOUT;
		break;
	case READ_ELEMENT_STATUS:
		rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
		break;
	case READ_DEFECT_DATA:
		rq->timeout = READ_DEFECT_DATA_TIMEOUT;
		rq->retries = 1;
		break;
	default:
		rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
		break;
	}

	if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
		err = DRIVER_ERROR << 24;
		goto out;
	}

	memset(sense, 0, sizeof(sense));
	rq->sense = sense;
	rq->sense_len = 0;
	rq->cmd_type = REQ_TYPE_BLOCK_PC;

	blk_execute_rq(q, disk, rq, 0);

out:
	err = rq->errors & 0xff;	/* only 8 bit SCSI status */
	if (err) {
		if (rq->sense_len && rq->sense) {
			bytes = (OMAX_SB_LEN > rq->sense_len) ?
				rq->sense_len : OMAX_SB_LEN;
			if (copy_to_user(sic->data, rq->sense, bytes))
				err = -EFAULT;
		}
	} else {
		if (copy_to_user(sic->data, buffer, out_len))
			err = -EFAULT;
	}
	
error:
	kfree(buffer);
	blk_put_request(rq);
	return err;
}
EXPORT_SYMBOL_GPL(sg_scsi_ioctl);

/* Send basic block requests */
static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
			      int cmd, int data)
{
	struct request *rq;
	int err;

	rq = blk_get_request(q, WRITE, __GFP_WAIT);
	rq->cmd_type = REQ_TYPE_BLOCK_PC;
	rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
	rq->cmd[0] = cmd;
	rq->cmd[4] = data;
	rq->cmd_len = 6;
	err = blk_execute_rq(q, bd_disk, rq, 0);
	blk_put_request(rq);

	return err;
}

static inline int blk_send_start_stop(struct request_queue *q,
				      struct gendisk *bd_disk, int data)
{
	return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
}

int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
		   unsigned int cmd, void __user *arg)
{
	int err;

	if (!q || blk_get_queue(q))
		return -ENXIO;

	switch (cmd) {
		/*
		 * new sgv3 interface
		 */
		case SG_GET_VERSION_NUM:
			err = sg_get_version(arg);
			break;
		case SCSI_IOCTL_GET_IDLUN:
			err = scsi_get_idlun(q, arg);
			break;
		case SCSI_IOCTL_GET_BUS_NUMBER:
			err = scsi_get_bus(q, arg);
			break;
		case SG_SET_TIMEOUT:
			err = sg_set_timeout(q, arg);
			break;
		case SG_GET_TIMEOUT:
			err = sg_get_timeout(q);
			break;
		case SG_GET_RESERVED_SIZE:
			err = sg_get_reserved_size(q, arg);
			break;
		case SG_SET_RESERVED_SIZE:
			err = sg_set_reserved_size(q, arg);
			break;
		case SG_EMULATED_HOST:
			err = sg_emulated_host(q, arg);
			break;
		case SG_IO: {
			struct sg_io_hdr hdr;

			err = -EFAULT;
			if (copy_from_user(&hdr, arg, sizeof(hdr)))
				break;
			err = sg_io(q, bd_disk, &hdr, mode);
			if (err == -EFAULT)
				break;

			if (copy_to_user(arg, &hdr, sizeof(hdr)))
				err = -EFAULT;
			break;
		}
		case CDROM_SEND_PACKET: {
			struct cdrom_generic_command cgc;
			struct sg_io_hdr hdr;

			err = -EFAULT;
			if (copy_from_user(&cgc, arg, sizeof(cgc)))
				break;
			cgc.timeout = clock_t_to_jiffies(cgc.timeout);
			memset(&hdr, 0, sizeof(hdr));
			hdr.interface_id = 'S';
			hdr.cmd_len = sizeof(cgc.cmd);
			hdr.dxfer_len = cgc.buflen;
			err = 0;
			switch (cgc.data_direction) {
				case CGC_DATA_UNKNOWN:
					hdr.dxfer_direction = SG_DXFER_UNKNOWN;
					break;
				case CGC_DATA_WRITE:
					hdr.dxfer_direction = SG_DXFER_TO_DEV;
					break;
				case CGC_DATA_READ:
					hdr.dxfer_direction = SG_DXFER_FROM_DEV;
					break;
				case CGC_DATA_NONE:
					hdr.dxfer_direction = SG_DXFER_NONE;
					break;
				default:
					err = -EINVAL;
			}
			if (err)
				break;

			hdr.dxferp = cgc.buffer;
			hdr.sbp = cgc.sense;
			if (hdr.sbp)
				hdr.mx_sb_len = sizeof(struct request_sense);
			hdr.timeout = jiffies_to_msecs(cgc.timeout);
			hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
			hdr.cmd_len = sizeof(cgc.cmd);

			err = sg_io(q, bd_disk, &hdr, mode);
			if (err == -EFAULT)
				break;

			if (hdr.status)
				err = -EIO;

			cgc.stat = err;
			cgc.buflen = hdr.resid;
			if (copy_to_user(arg, &cgc, sizeof(cgc)))
				err = -EFAULT;

			break;
		}

		/*
		 * old junk scsi send command ioctl
		 */
		case SCSI_IOCTL_SEND_COMMAND:
			printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
			err = -EINVAL;
			if (!arg)
				break;

			err = sg_scsi_ioctl(q, bd_disk, mode, arg);
			break;
		case CDROMCLOSETRAY:
			err = blk_send_start_stop(q, bd_disk, 0x03);
			break;
		case CDROMEJECT:
			err = blk_send_start_stop(q, bd_disk, 0x02);
			break;
		default:
			err = -ENOTTY;
	}

	blk_put_queue(q);
	return err;
}
EXPORT_SYMBOL(scsi_cmd_ioctl);

int __init blk_scsi_ioctl_init(void)
{
	blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
	return 0;
}
fs_initcall(blk_scsi_ioctl_init);