[deliverable/linux.git] / drivers / target / target_core_sbc.c

/*
 * SCSI Block Commands (SBC) parsing and emulation.
 *
 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
 * Copyright (c) 2007-2010 Rising Tide Systems
 * Copyright (c) 2008-2010 Linux-iSCSI.org
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>

#include "target_core_internal.h"
#include "target_core_ua.h"


static int sbc_emulate_readcapacity(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;
	unsigned long long blocks_long = dev->transport->get_blocks(dev);
	unsigned char *rbuf;
	unsigned char buf[8];
	u32 blocks;

	if (blocks_long >= 0x00000000ffffffff)
		blocks = 0xffffffff;
	else
		blocks = (u32)blocks_long;

	buf[0] = (blocks >> 24) & 0xff;
	buf[1] = (blocks >> 16) & 0xff;
	buf[2] = (blocks >> 8) & 0xff;
	buf[3] = blocks & 0xff;
	buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
	buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
	buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
	buf[7] = dev->dev_attrib.block_size & 0xff;

	rbuf = transport_kmap_data_sg(cmd);
	if (rbuf) {
		memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
		transport_kunmap_data_sg(cmd);
	}

	target_complete_cmd(cmd, GOOD);
	return 0;
}

static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;
	unsigned char *rbuf;
	unsigned char buf[32];
	unsigned long long blocks = dev->transport->get_blocks(dev);

	memset(buf, 0, sizeof(buf));
	buf[0] = (blocks >> 56) & 0xff;
	buf[1] = (blocks >> 48) & 0xff;
	buf[2] = (blocks >> 40) & 0xff;
	buf[3] = (blocks >> 32) & 0xff;
	buf[4] = (blocks >> 24) & 0xff;
	buf[5] = (blocks >> 16) & 0xff;
	buf[6] = (blocks >> 8) & 0xff;
	buf[7] = blocks & 0xff;
	buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
	buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
	buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
	buf[11] = dev->dev_attrib.block_size & 0xff;
	/*
	 * Set Thin Provisioning Enable bit following sbc3r22 in section
	 * READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
	 */
	if (dev->dev_attrib.emulate_tpu || dev->dev_attrib.emulate_tpws)
		buf[14] = 0x80;

	rbuf = transport_kmap_data_sg(cmd);
	if (rbuf) {
		memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
		transport_kunmap_data_sg(cmd);
	}

	target_complete_cmd(cmd, GOOD);
	return 0;
}

int spc_get_write_same_sectors(struct se_cmd *cmd)
{
	u32 num_blocks;

	if (cmd->t_task_cdb[0] == WRITE_SAME)
		num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
	else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
	else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
		num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);

	/*
	 * Use the explicit range when non zero is supplied, otherwise calculate
	 * the remaining range based on ->get_blocks() - starting LBA.
	 */
	if (num_blocks)
		return num_blocks;

	return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
		cmd->t_task_lba + 1;
}
EXPORT_SYMBOL(spc_get_write_same_sectors);

static int sbc_emulate_verify(struct se_cmd *cmd)
{
	target_complete_cmd(cmd, GOOD);
	return 0;
}

static int sbc_emulate_noop(struct se_cmd *cmd)
{
	target_complete_cmd(cmd, GOOD);
	return 0;
}

static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
{
	return cmd->se_dev->dev_attrib.block_size * sectors;
}

static int sbc_check_valid_sectors(struct se_cmd *cmd)
{
	struct se_device *dev = cmd->se_dev;
	unsigned long long end_lba;
	u32 sectors;

	sectors = cmd->data_length / dev->dev_attrib.block_size;
	end_lba = dev->transport->get_blocks(dev) + 1;

	if (cmd->t_task_lba + sectors > end_lba) {
		pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
			cmd->t_task_lba, sectors, end_lba);
		return -EINVAL;
	}

	return 0;
}

static inline u32 transport_get_sectors_6(unsigned char *cdb)
{
	/*
	 * Use 8-bit sector value.  SBC-3 says:
	 *
	 *   A TRANSFER LENGTH field set to zero specifies that 256
	 *   logical blocks shall be written.  Any other value
	 *   specifies the number of logical blocks that shall be
	 *   written.
	 */
	return cdb[4] ? : 256;
}

static inline u32 transport_get_sectors_10(unsigned char *cdb)
{
	return (u32)(cdb[7] << 8) + cdb[8];
}

static inline u32 transport_get_sectors_12(unsigned char *cdb)
{
	return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
}

static inline u32 transport_get_sectors_16(unsigned char *cdb)
{
	return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
		    (cdb[12] << 8) + cdb[13];
}

/*
 * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
 */
static inline u32 transport_get_sectors_32(unsigned char *cdb)
{
	return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
		    (cdb[30] << 8) + cdb[31];

}

static inline u32 transport_lba_21(unsigned char *cdb)
{
	return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
}

static inline u32 transport_lba_32(unsigned char *cdb)
{
	return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
}

static inline unsigned long long transport_lba_64(unsigned char *cdb)
{
	unsigned int __v1, __v2;

	__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
	__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];

	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}

/*
 * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
 */
static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
{
	unsigned int __v1, __v2;

	__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
	__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];

	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}

static int sbc_write_same_supported(struct se_device *dev,
		unsigned char *flags)
{
	if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
		pr_err("WRITE_SAME PBDATA and LBDATA"
			" bits not supported for Block Discard"
			" Emulation\n");
		return -ENOSYS;
	}

	/*
	 * Currently for the emulated case we only accept
	 * tpws with the UNMAP=1 bit set.
	 */
	if (!(flags[0] & 0x08)) {
		pr_err("WRITE_SAME w/o UNMAP bit not"
			" supported for Block Discard Emulation\n");
		return -ENOSYS;
	}

	return 0;
}

static void xdreadwrite_callback(struct se_cmd *cmd)
{
	unsigned char *buf, *addr;
	struct scatterlist *sg;
	unsigned int offset;
	int i;
	int count;
	/*
	 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
	 *
	 * 1) read the specified logical block(s);
	 * 2) transfer logical blocks from the data-out buffer;
	 * 3) XOR the logical blocks transferred from the data-out buffer with
	 *    the logical blocks read, storing the resulting XOR data in a buffer;
	 * 4) if the DISABLE WRITE bit is set to zero, then write the logical
	 *    blocks transferred from the data-out buffer; and
	 * 5) transfer the resulting XOR data to the data-in buffer.
	 */
	buf = kmalloc(cmd->data_length, GFP_KERNEL);
	if (!buf) {
		pr_err("Unable to allocate xor_callback buf\n");
		return;
	}
	/*
	 * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
	 * into the locally allocated *buf
	 */
	sg_copy_to_buffer(cmd->t_data_sg,
			  cmd->t_data_nents,
			  buf,
			  cmd->data_length);

	/*
	 * Now perform the XOR against the BIDI read memory located at
	 * cmd->t_mem_bidi_list
	 */

	offset = 0;
	for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
		addr = kmap_atomic(sg_page(sg));
		if (!addr)
			goto out;

		for (i = 0; i < sg->length; i++)
			*(addr + sg->offset + i) ^= *(buf + offset + i);

		offset += sg->length;
		kunmap_atomic(addr);
	}

out:
	kfree(buf);
}

int sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
{
	struct se_device *dev = cmd->se_dev;
	unsigned char *cdb = cmd->t_task_cdb;
	unsigned int size;
	u32 sectors = 0;
	int ret;

	switch (cdb[0]) {
	case READ_6:
		sectors = transport_get_sectors_6(cdb);
		cmd->t_task_lba = transport_lba_21(cdb);
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case READ_10:
		sectors = transport_get_sectors_10(cdb);
		cmd->t_task_lba = transport_lba_32(cdb);
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case READ_12:
		sectors = transport_get_sectors_12(cdb);
		cmd->t_task_lba = transport_lba_32(cdb);
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case READ_16:
		sectors = transport_get_sectors_16(cdb);
		cmd->t_task_lba = transport_lba_64(cdb);
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case WRITE_6:
		sectors = transport_get_sectors_6(cdb);
		cmd->t_task_lba = transport_lba_21(cdb);
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case WRITE_10:
	case WRITE_VERIFY:
		sectors = transport_get_sectors_10(cdb);
		cmd->t_task_lba = transport_lba_32(cdb);
		if (cdb[1] & 0x8)
			cmd->se_cmd_flags |= SCF_FUA;
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case WRITE_12:
		sectors = transport_get_sectors_12(cdb);
		cmd->t_task_lba = transport_lba_32(cdb);
		if (cdb[1] & 0x8)
			cmd->se_cmd_flags |= SCF_FUA;
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case WRITE_16:
		sectors = transport_get_sectors_16(cdb);
		cmd->t_task_lba = transport_lba_64(cdb);
		if (cdb[1] & 0x8)
			cmd->se_cmd_flags |= SCF_FUA;
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;
		cmd->execute_cmd = ops->execute_rw;
		break;
	case XDWRITEREAD_10:
		if ((cmd->data_direction != DMA_TO_DEVICE) ||
		    !(cmd->se_cmd_flags & SCF_BIDI))
			goto out_invalid_cdb_field;
		sectors = transport_get_sectors_10(cdb);

		cmd->t_task_lba = transport_lba_32(cdb);
		cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;

		/*
		 * Setup BIDI XOR callback to be run after I/O completion.
		 */
		cmd->execute_cmd = ops->execute_rw;
		cmd->transport_complete_callback = &xdreadwrite_callback;
		if (cdb[1] & 0x8)
			cmd->se_cmd_flags |= SCF_FUA;
		break;
	case VARIABLE_LENGTH_CMD:
	{
		u16 service_action = get_unaligned_be16(&cdb[8]);
		switch (service_action) {
		case XDWRITEREAD_32:
			sectors = transport_get_sectors_32(cdb);

			/*
			 * Use WRITE_32 and READ_32 opcodes for the emulated
			 * XDWRITE_READ_32 logic.
			 */
			cmd->t_task_lba = transport_lba_64_ext(cdb);
			cmd->se_cmd_flags |= SCF_SCSI_DATA_CDB;

			/*
			 * Setup BIDI XOR callback to be run during after I/O
			 * completion.
			 */
			cmd->execute_cmd = ops->execute_rw;
			cmd->transport_complete_callback = &xdreadwrite_callback;
			if (cdb[1] & 0x8)
				cmd->se_cmd_flags |= SCF_FUA;
			break;
		case WRITE_SAME_32:
			if (!ops->execute_write_same)
				goto out_unsupported_cdb;

			sectors = transport_get_sectors_32(cdb);
			if (!sectors) {
				pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
				       " supported\n");
				goto out_invalid_cdb_field;
			}

			size = sbc_get_size(cmd, 1);
			cmd->t_task_lba = get_unaligned_be64(&cdb[12]);

			if (sbc_write_same_supported(dev, &cdb[10]) < 0)
				goto out_unsupported_cdb;
			cmd->execute_cmd = ops->execute_write_same;
			break;
		default:
			pr_err("VARIABLE_LENGTH_CMD service action"
				" 0x%04x not supported\n", service_action);
			goto out_unsupported_cdb;
		}
		break;
	}
	case READ_CAPACITY:
		size = READ_CAP_LEN;
		cmd->execute_cmd = sbc_emulate_readcapacity;
		break;
	case SERVICE_ACTION_IN:
		switch (cmd->t_task_cdb[1] & 0x1f) {
		case SAI_READ_CAPACITY_16:
			cmd->execute_cmd = sbc_emulate_readcapacity_16;
			break;
		default:
			pr_err("Unsupported SA: 0x%02x\n",
				cmd->t_task_cdb[1] & 0x1f);
			goto out_invalid_cdb_field;
		}
		size = (cdb[10] << 24) | (cdb[11] << 16) |
		       (cdb[12] << 8) | cdb[13];
		break;
	case SYNCHRONIZE_CACHE:
	case SYNCHRONIZE_CACHE_16:
		if (!ops->execute_sync_cache)
			goto out_unsupported_cdb;

		/*
		 * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
		 */
		if (cdb[0] == SYNCHRONIZE_CACHE) {
			sectors = transport_get_sectors_10(cdb);
			cmd->t_task_lba = transport_lba_32(cdb);
		} else {
			sectors = transport_get_sectors_16(cdb);
			cmd->t_task_lba = transport_lba_64(cdb);
		}

		size = sbc_get_size(cmd, sectors);

		/*
		 * Check to ensure that LBA + Range does not exceed past end of
		 * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
		 */
		if (cmd->t_task_lba || sectors) {
			if (sbc_check_valid_sectors(cmd) < 0)
				goto out_invalid_cdb_field;
		}
		cmd->execute_cmd = ops->execute_sync_cache;
		break;
	case UNMAP:
		if (!ops->execute_unmap)
			goto out_unsupported_cdb;

		size = get_unaligned_be16(&cdb[7]);
		cmd->execute_cmd = ops->execute_unmap;
		break;
	case WRITE_SAME_16:
		if (!ops->execute_write_same)
			goto out_unsupported_cdb;

		sectors = transport_get_sectors_16(cdb);
		if (!sectors) {
			pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
			goto out_invalid_cdb_field;
		}

		size = sbc_get_size(cmd, 1);
		cmd->t_task_lba = get_unaligned_be64(&cdb[2]);

		if (sbc_write_same_supported(dev, &cdb[1]) < 0)
			goto out_unsupported_cdb;
		cmd->execute_cmd = ops->execute_write_same;
		break;
	case WRITE_SAME:
		if (!ops->execute_write_same)
			goto out_unsupported_cdb;

		sectors = transport_get_sectors_10(cdb);
		if (!sectors) {
			pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
			goto out_invalid_cdb_field;
		}

		size = sbc_get_size(cmd, 1);
		cmd->t_task_lba = get_unaligned_be32(&cdb[2]);

		/*
		 * Follow sbcr26 with WRITE_SAME (10) and check for the existence
		 * of byte 1 bit 3 UNMAP instead of original reserved field
		 */
		if (sbc_write_same_supported(dev, &cdb[1]) < 0)
			goto out_unsupported_cdb;
		cmd->execute_cmd = ops->execute_write_same;
		break;
	case VERIFY:
		size = 0;
		cmd->execute_cmd = sbc_emulate_verify;
		break;
	case REZERO_UNIT:
	case SEEK_6:
	case SEEK_10:
		/*
		 * There are still clients out there which use these old SCSI-2
		 * commands. This mainly happens when running VMs with legacy
		 * guest systems, connected via SCSI command pass-through to
		 * iSCSI targets. Make them happy and return status GOOD.
		 */
		size = 0;
		cmd->execute_cmd = sbc_emulate_noop;
		break;
	default:
		ret = spc_parse_cdb(cmd, &size);
		if (ret)
			return ret;
	}

	/* reject any command that we don't have a handler for */
	if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
		goto out_unsupported_cdb;

	if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
		unsigned long long end_lba;

		if (sectors > dev->dev_attrib.fabric_max_sectors) {
			printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
				" big sectors %u exceeds fabric_max_sectors:"
				" %u\n", cdb[0], sectors,
				dev->dev_attrib.fabric_max_sectors);
			goto out_invalid_cdb_field;
		}
		if (sectors > dev->dev_attrib.hw_max_sectors) {
			printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
				" big sectors %u exceeds backend hw_max_sectors:"
				" %u\n", cdb[0], sectors,
				dev->dev_attrib.hw_max_sectors);
			goto out_invalid_cdb_field;
		}

		end_lba = dev->transport->get_blocks(dev) + 1;
		if (cmd->t_task_lba + sectors > end_lba) {
			pr_err("cmd exceeds last lba %llu "
				"(lba %llu, sectors %u)\n",
				end_lba, cmd->t_task_lba, sectors);
			goto out_invalid_cdb_field;
		}

		size = sbc_get_size(cmd, sectors);
	}

	ret = target_cmd_size_check(cmd, size);
	if (ret < 0)
		return ret;

	return 0;

out_unsupported_cdb:
	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
	return -EINVAL;
out_invalid_cdb_field:
	cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
	cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
	return -EINVAL;
}
EXPORT_SYMBOL(sbc_parse_cdb);

u32 sbc_get_device_type(struct se_device *dev)
{
	return TYPE_DISK;
}
EXPORT_SYMBOL(sbc_get_device_type);
Commit	Line	Data
d6e0175c CH	1	/*
	2	* SCSI Block Commands (SBC) parsing and emulation.
	3	*
	4	* Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
	5	* Copyright (c) 2005, 2006, 2007 SBE, Inc.
	6	* Copyright (c) 2007-2010 Rising Tide Systems
	7	* Copyright (c) 2008-2010 Linux-iSCSI.org
	8	*
	9	* Nicholas A. Bellinger <nab@kernel.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/ratelimit.h>
	29	#include <asm/unaligned.h>
	30	#include <scsi/scsi.h>
	31
	32	#include <target/target_core_base.h>
	33	#include <target/target_core_backend.h>
	34	#include <target/target_core_fabric.h>
	35
	36	#include "target_core_internal.h"
	37	#include "target_core_ua.h"
	38
	39
1fd032ee CH	40	static int sbc_emulate_readcapacity(struct se_cmd *cmd)
	41	{
	42	struct se_device *dev = cmd->se_dev;
1fd032ee	43	unsigned long long blocks_long = dev->transport->get_blocks(dev);
a50da144 PB	44	unsigned char *rbuf;
a50da144 PB	45	unsigned char buf[8];
1fd032ee CH	46	u32 blocks;
	47
	48	if (blocks_long >= 0x00000000ffffffff)
	49	blocks = 0xffffffff;
	50	else
	51	blocks = (u32)blocks_long;
	52
1fd032ee CH	53	buf[0] = (blocks >> 24) & 0xff;
	54	buf[1] = (blocks >> 16) & 0xff;
	55	buf[2] = (blocks >> 8) & 0xff;
	56	buf[3] = blocks & 0xff;
0fd97ccf CH	57	buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
	58	buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
	59	buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
	60	buf[7] = dev->dev_attrib.block_size & 0xff;
1fd032ee	61
a50da144 PB	62	rbuf = transport_kmap_data_sg(cmd);
	63	if (rbuf) {
	64	memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
	65	transport_kunmap_data_sg(cmd);
	66	}
1fd032ee CH	67
	68	target_complete_cmd(cmd, GOOD);
	69	return 0;
	70	}
	71
	72	static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
	73	{
	74	struct se_device *dev = cmd->se_dev;
a50da144 PB	75	unsigned char *rbuf;
a50da144 PB	76	unsigned char buf[32];
1fd032ee CH	77	unsigned long long blocks = dev->transport->get_blocks(dev);
1fd032ee CH	78
a50da144	79	memset(buf, 0, sizeof(buf));
1fd032ee CH	80	buf[0] = (blocks >> 56) & 0xff;
	81	buf[1] = (blocks >> 48) & 0xff;
	82	buf[2] = (blocks >> 40) & 0xff;
	83	buf[3] = (blocks >> 32) & 0xff;
	84	buf[4] = (blocks >> 24) & 0xff;
	85	buf[5] = (blocks >> 16) & 0xff;
	86	buf[6] = (blocks >> 8) & 0xff;
	87	buf[7] = blocks & 0xff;
0fd97ccf CH	88	buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
	89	buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
	90	buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
	91	buf[11] = dev->dev_attrib.block_size & 0xff;
1fd032ee CH	92	/*
	93	* Set Thin Provisioning Enable bit following sbc3r22 in section
	94	* READ CAPACITY (16) byte 14 if emulate_tpu or emulate_tpws is enabled.
	95	*/
0fd97ccf	96	if (dev->dev_attrib.emulate_tpu \|\| dev->dev_attrib.emulate_tpws)
1fd032ee CH	97	buf[14] = 0x80;
1fd032ee CH	98
a50da144 PB	99	rbuf = transport_kmap_data_sg(cmd);
	100	if (rbuf) {
	101	memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
	102	transport_kunmap_data_sg(cmd);
	103	}
1fd032ee CH	104
	105	target_complete_cmd(cmd, GOOD);
	106	return 0;
	107	}
	108
6f974e8c	109	int spc_get_write_same_sectors(struct se_cmd *cmd)
1fd032ee	110	{
1fd032ee	111	u32 num_blocks;
1fd032ee CH	112
	113	if (cmd->t_task_cdb[0] == WRITE_SAME)
	114	num_blocks = get_unaligned_be16(&cmd->t_task_cdb[7]);
	115	else if (cmd->t_task_cdb[0] == WRITE_SAME_16)
	116	num_blocks = get_unaligned_be32(&cmd->t_task_cdb[10]);
	117	else /* WRITE_SAME_32 via VARIABLE_LENGTH_CMD */
	118	num_blocks = get_unaligned_be32(&cmd->t_task_cdb[28]);
	119
	120	/*
	121	* Use the explicit range when non zero is supplied, otherwise calculate
	122	* the remaining range based on ->get_blocks() - starting LBA.
	123	*/
6f974e8c CH	124	if (num_blocks)
6f974e8c CH	125	return num_blocks;
1fd032ee	126
6f974e8c CH	127	return cmd->se_dev->transport->get_blocks(cmd->se_dev) -
6f974e8c CH	128	cmd->t_task_lba + 1;
1fd032ee	129	}
6f974e8c	130	EXPORT_SYMBOL(spc_get_write_same_sectors);
1fd032ee	131
1fd032ee CH	132	static int sbc_emulate_verify(struct se_cmd *cmd)
	133	{
	134	target_complete_cmd(cmd, GOOD);
	135	return 0;
	136	}
	137
1a1ff38c BK	138	static int sbc_emulate_noop(struct se_cmd *cmd)
	139	{
	140	target_complete_cmd(cmd, GOOD);
	141	return 0;
	142	}
	143
d6e0175c CH	144	static inline u32 sbc_get_size(struct se_cmd *cmd, u32 sectors)
d6e0175c CH	145	{
0fd97ccf	146	return cmd->se_dev->dev_attrib.block_size * sectors;
d6e0175c CH	147	}
	148
	149	static int sbc_check_valid_sectors(struct se_cmd *cmd)
	150	{
	151	struct se_device *dev = cmd->se_dev;
	152	unsigned long long end_lba;
	153	u32 sectors;
	154
0fd97ccf	155	sectors = cmd->data_length / dev->dev_attrib.block_size;
d6e0175c CH	156	end_lba = dev->transport->get_blocks(dev) + 1;
	157
	158	if (cmd->t_task_lba + sectors > end_lba) {
	159	pr_err("target: lba %llu, sectors %u exceeds end lba %llu\n",
	160	cmd->t_task_lba, sectors, end_lba);
	161	return -EINVAL;
	162	}
	163
	164	return 0;
	165	}
	166
	167	static inline u32 transport_get_sectors_6(unsigned char *cdb)
	168	{
	169	/*
	170	* Use 8-bit sector value. SBC-3 says:
	171	*
	172	* A TRANSFER LENGTH field set to zero specifies that 256
	173	* logical blocks shall be written. Any other value
	174	* specifies the number of logical blocks that shall be
	175	* written.
	176	*/
	177	return cdb[4] ? : 256;
	178	}
	179
	180	static inline u32 transport_get_sectors_10(unsigned char *cdb)
	181	{
	182	return (u32)(cdb[7] << 8) + cdb[8];
	183	}
	184
	185	static inline u32 transport_get_sectors_12(unsigned char *cdb)
	186	{
	187	return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
	188	}
	189
	190	static inline u32 transport_get_sectors_16(unsigned char *cdb)
	191	{
	192	return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
	193	(cdb[12] << 8) + cdb[13];
	194	}
	195
	196	/*
	197	* Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
	198	*/
	199	static inline u32 transport_get_sectors_32(unsigned char *cdb)
	200	{
	201	return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
	202	(cdb[30] << 8) + cdb[31];
	203
	204	}
	205
	206	static inline u32 transport_lba_21(unsigned char *cdb)
	207	{
	208	return ((cdb[1] & 0x1f) << 16) \| (cdb[2] << 8) \| cdb[3];
	209	}
	210
	211	static inline u32 transport_lba_32(unsigned char *cdb)
	212	{
	213	return (cdb[2] << 24) \| (cdb[3] << 16) \| (cdb[4] << 8) \| cdb[5];
	214	}
	215
	216	static inline unsigned long long transport_lba_64(unsigned char *cdb)
	217	{
	218	unsigned int __v1, __v2;
	219
220	__v1 = (cdb[2] << 24) \| (cdb[3] << 16) \| (cdb[4] << 8) \| cdb[5];
221	__v2 = (cdb[6] << 24) \| (cdb[7] << 16) \| (cdb[8] << 8) \| cdb[9];
222
223	return ((unsigned long long)__v2) \| (unsigned long long)__v1 << 32;
224	}
225
226	/*
227	* For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
228	*/
229	static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
230	{
231	unsigned int __v1, __v2;
232
233	__v1 = (cdb[12] << 24) \| (cdb[13] << 16) \| (cdb[14] << 8) \| cdb[15];
234	__v2 = (cdb[16] << 24) \| (cdb[17] << 16) \| (cdb[18] << 8) \| cdb[19];
235
236	return ((unsigned long long)__v2) \| (unsigned long long)__v1 << 32;
237	}
238
239	static int sbc_write_same_supported(struct se_device *dev,
240	unsigned char *flags)
241	{
242	if ((flags[0] & 0x04) \|\| (flags[0] & 0x02)) {
243	pr_err("WRITE_SAME PBDATA and LBDATA"
244	" bits not supported for Block Discard"
245	" Emulation\n");
246	return -ENOSYS;
247	}
248
249	/*
250	* Currently for the emulated case we only accept
251	* tpws with the UNMAP=1 bit set.
252	*/
253	if (!(flags[0] & 0x08)) {
254	pr_err("WRITE_SAME w/o UNMAP bit not"
255	" supported for Block Discard Emulation\n");
256	return -ENOSYS;
257	}
258
259	return 0;
260	}
261
262	static void xdreadwrite_callback(struct se_cmd *cmd)
263	{
264	unsigned char buf, addr;
265	struct scatterlist *sg;
266	unsigned int offset;
267	int i;
268	int count;
269	/*
270	* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
271	*
272	* 1) read the specified logical block(s);
273	* 2) transfer logical blocks from the data-out buffer;
274	* 3) XOR the logical blocks transferred from the data-out buffer with
275	* the logical blocks read, storing the resulting XOR data in a buffer;
276	* 4) if the DISABLE WRITE bit is set to zero, then write the logical
277	* blocks transferred from the data-out buffer; and
278	* 5) transfer the resulting XOR data to the data-in buffer.
279	*/
280	buf = kmalloc(cmd->data_length, GFP_KERNEL);
281	if (!buf) {
282	pr_err("Unable to allocate xor_callback buf\n");
283	return;
284	}
285	/*
286	* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
287	* into the locally allocated *buf
288	*/
289	sg_copy_to_buffer(cmd->t_data_sg,
290	cmd->t_data_nents,
291	buf,
292	cmd->data_length);
293
294	/*
295	* Now perform the XOR against the BIDI read memory located at
296	* cmd->t_mem_bidi_list
297	*/
298
299	offset = 0;
300	for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
301	addr = kmap_atomic(sg_page(sg));
302	if (!addr)
303	goto out;
304
305	for (i = 0; i < sg->length; i++)
306	(addr + sg->offset + i) ^= (buf + offset + i);
307
308	offset += sg->length;
309	kunmap_atomic(addr);
310	}
311
312	out:
313	kfree(buf);
314	}
315
9e999a6c	316	int sbc_parse_cdb(struct se_cmd cmd, struct sbc_ops ops)
d6e0175c	317	{
d6e0175c CH	318	struct se_device *dev = cmd->se_dev;
d6e0175c CH	319	unsigned char *cdb = cmd->t_task_cdb;
1fd032ee	320	unsigned int size;
d6e0175c CH	321	u32 sectors = 0;
	322	int ret;
	323
	324	switch (cdb[0]) {
	325	case READ_6:
	326	sectors = transport_get_sectors_6(cdb);
	327	cmd->t_task_lba = transport_lba_21(cdb);
	328	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	329	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	330	break;
	331	case READ_10:
	332	sectors = transport_get_sectors_10(cdb);
	333	cmd->t_task_lba = transport_lba_32(cdb);
	334	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	335	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	336	break;
	337	case READ_12:
	338	sectors = transport_get_sectors_12(cdb);
	339	cmd->t_task_lba = transport_lba_32(cdb);
	340	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	341	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	342	break;
	343	case READ_16:
	344	sectors = transport_get_sectors_16(cdb);
	345	cmd->t_task_lba = transport_lba_64(cdb);
	346	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	347	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	348	break;
	349	case WRITE_6:
	350	sectors = transport_get_sectors_6(cdb);
	351	cmd->t_task_lba = transport_lba_21(cdb);
	352	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	353	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	354	break;
	355	case WRITE_10:
	356	case WRITE_VERIFY:
	357	sectors = transport_get_sectors_10(cdb);
	358	cmd->t_task_lba = transport_lba_32(cdb);
	359	if (cdb[1] & 0x8)
	360	cmd->se_cmd_flags \|= SCF_FUA;
	361	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	362	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	363	break;
	364	case WRITE_12:
	365	sectors = transport_get_sectors_12(cdb);
	366	cmd->t_task_lba = transport_lba_32(cdb);
	367	if (cdb[1] & 0x8)
	368	cmd->se_cmd_flags \|= SCF_FUA;
	369	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	370	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	371	break;
	372	case WRITE_16:
	373	sectors = transport_get_sectors_16(cdb);
	374	cmd->t_task_lba = transport_lba_64(cdb);
	375	if (cdb[1] & 0x8)
	376	cmd->se_cmd_flags \|= SCF_FUA;
	377	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
0c2ad7d1	378	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	379	break;
	380	case XDWRITEREAD_10:
	381	if ((cmd->data_direction != DMA_TO_DEVICE) \|\|
	382	!(cmd->se_cmd_flags & SCF_BIDI))
	383	goto out_invalid_cdb_field;
	384	sectors = transport_get_sectors_10(cdb);
	385
	386	cmd->t_task_lba = transport_lba_32(cdb);
	387	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
	388
	389	/*
	390	* Setup BIDI XOR callback to be run after I/O completion.
	391	*/
0c2ad7d1	392	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	393	cmd->transport_complete_callback = &xdreadwrite_callback;
	394	if (cdb[1] & 0x8)
	395	cmd->se_cmd_flags \|= SCF_FUA;
	396	break;
	397	case VARIABLE_LENGTH_CMD:
	398	{
	399	u16 service_action = get_unaligned_be16(&cdb[8]);
	400	switch (service_action) {
	401	case XDWRITEREAD_32:
	402	sectors = transport_get_sectors_32(cdb);
	403
	404	/*
	405	* Use WRITE_32 and READ_32 opcodes for the emulated
	406	* XDWRITE_READ_32 logic.
	407	*/
	408	cmd->t_task_lba = transport_lba_64_ext(cdb);
	409	cmd->se_cmd_flags \|= SCF_SCSI_DATA_CDB;
	410
	411	/*
	412	* Setup BIDI XOR callback to be run during after I/O
	413	* completion.
	414	*/
0c2ad7d1	415	cmd->execute_cmd = ops->execute_rw;
d6e0175c CH	416	cmd->transport_complete_callback = &xdreadwrite_callback;
	417	if (cdb[1] & 0x8)
	418	cmd->se_cmd_flags \|= SCF_FUA;
	419	break;
	420	case WRITE_SAME_32:
6f974e8c CH	421	if (!ops->execute_write_same)
	422	goto out_unsupported_cdb;
	423
d6e0175c CH	424	sectors = transport_get_sectors_32(cdb);
	425	if (!sectors) {
	426	pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
	427	" supported\n");
	428	goto out_invalid_cdb_field;
	429	}
	430
1fd032ee	431	size = sbc_get_size(cmd, 1);
d6e0175c CH	432	cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
	433
	434	if (sbc_write_same_supported(dev, &cdb[10]) < 0)
	435	goto out_unsupported_cdb;
6f974e8c	436	cmd->execute_cmd = ops->execute_write_same;
d6e0175c CH	437	break;
	438	default:
	439	pr_err("VARIABLE_LENGTH_CMD service action"
	440	" 0x%04x not supported\n", service_action);
	441	goto out_unsupported_cdb;
	442	}
	443	break;
	444	}
	445	case READ_CAPACITY:
1fd032ee CH	446	size = READ_CAP_LEN;
1fd032ee CH	447	cmd->execute_cmd = sbc_emulate_readcapacity;
d6e0175c CH	448	break;
	449	case SERVICE_ACTION_IN:
	450	switch (cmd->t_task_cdb[1] & 0x1f) {
	451	case SAI_READ_CAPACITY_16:
1fd032ee	452	cmd->execute_cmd = sbc_emulate_readcapacity_16;
d6e0175c CH	453	break;
	454	default:
	455	pr_err("Unsupported SA: 0x%02x\n",
	456	cmd->t_task_cdb[1] & 0x1f);
	457	goto out_invalid_cdb_field;
	458	}
1fd032ee	459	size = (cdb[10] << 24) \| (cdb[11] << 16) \|
d6e0175c CH	460	(cdb[12] << 8) \| cdb[13];
	461	break;
	462	case SYNCHRONIZE_CACHE:
	463	case SYNCHRONIZE_CACHE_16:
ad67f0d9 CH	464	if (!ops->execute_sync_cache)
	465	goto out_unsupported_cdb;
	466
d6e0175c CH	467	/*
	468	* Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
	469	*/
	470	if (cdb[0] == SYNCHRONIZE_CACHE) {
	471	sectors = transport_get_sectors_10(cdb);
	472	cmd->t_task_lba = transport_lba_32(cdb);
	473	} else {
	474	sectors = transport_get_sectors_16(cdb);
	475	cmd->t_task_lba = transport_lba_64(cdb);
	476	}
	477
1fd032ee	478	size = sbc_get_size(cmd, sectors);
d6e0175c CH	479
	480	/*
	481	* Check to ensure that LBA + Range does not exceed past end of
	482	* device for IBLOCK and FILEIO ->do_sync_cache() backend calls
	483	*/
	484	if (cmd->t_task_lba \|\| sectors) {
	485	if (sbc_check_valid_sectors(cmd) < 0)
	486	goto out_invalid_cdb_field;
	487	}
ad67f0d9	488	cmd->execute_cmd = ops->execute_sync_cache;
d6e0175c CH	489	break;
d6e0175c CH	490	case UNMAP:
14150a6b CH	491	if (!ops->execute_unmap)
	492	goto out_unsupported_cdb;
	493
1fd032ee	494	size = get_unaligned_be16(&cdb[7]);
14150a6b	495	cmd->execute_cmd = ops->execute_unmap;
d6e0175c CH	496	break;
d6e0175c CH	497	case WRITE_SAME_16:
6f974e8c CH	498	if (!ops->execute_write_same)
	499	goto out_unsupported_cdb;
	500
d6e0175c CH	501	sectors = transport_get_sectors_16(cdb);
	502	if (!sectors) {
	503	pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
	504	goto out_invalid_cdb_field;
	505	}
	506
1fd032ee	507	size = sbc_get_size(cmd, 1);
d6e0175c CH	508	cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
	509
	510	if (sbc_write_same_supported(dev, &cdb[1]) < 0)
	511	goto out_unsupported_cdb;
6f974e8c	512	cmd->execute_cmd = ops->execute_write_same;
d6e0175c CH	513	break;
d6e0175c CH	514	case WRITE_SAME:
6f974e8c CH	515	if (!ops->execute_write_same)
	516	goto out_unsupported_cdb;
	517
d6e0175c CH	518	sectors = transport_get_sectors_10(cdb);
	519	if (!sectors) {
	520	pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
	521	goto out_invalid_cdb_field;
	522	}
	523
1fd032ee	524	size = sbc_get_size(cmd, 1);
d6e0175c CH	525	cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
	526
	527	/*
	528	* Follow sbcr26 with WRITE_SAME (10) and check for the existence
	529	* of byte 1 bit 3 UNMAP instead of original reserved field
	530	*/
	531	if (sbc_write_same_supported(dev, &cdb[1]) < 0)
	532	goto out_unsupported_cdb;
6f974e8c	533	cmd->execute_cmd = ops->execute_write_same;
d6e0175c CH	534	break;
d6e0175c CH	535	case VERIFY:
1fd032ee CH	536	size = 0;
1fd032ee CH	537	cmd->execute_cmd = sbc_emulate_verify;
d6e0175c	538	break;
1a1ff38c BK	539	case REZERO_UNIT:
	540	case SEEK_6:
	541	case SEEK_10:
	542	/*
	543	* There are still clients out there which use these old SCSI-2
	544	* commands. This mainly happens when running VMs with legacy
	545	* guest systems, connected via SCSI command pass-through to
	546	* iSCSI targets. Make them happy and return status GOOD.
	547	*/
	548	size = 0;
	549	cmd->execute_cmd = sbc_emulate_noop;
	550	break;
d6e0175c	551	default:
1fd032ee	552	ret = spc_parse_cdb(cmd, &size);
d6e0175c CH	553	if (ret)
	554	return ret;
	555	}
	556
	557	/* reject any command that we don't have a handler for */
	558	if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->execute_cmd)
	559	goto out_unsupported_cdb;
	560
	561	if (cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
1fd032ee CH	562	unsigned long long end_lba;
1fd032ee CH	563
0fd97ccf	564	if (sectors > dev->dev_attrib.fabric_max_sectors) {
d6e0175c CH	565	printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
	566	" big sectors %u exceeds fabric_max_sectors:"
	567	" %u\n", cdb[0], sectors,
0fd97ccf	568	dev->dev_attrib.fabric_max_sectors);
d6e0175c CH	569	goto out_invalid_cdb_field;
d6e0175c CH	570	}
0fd97ccf	571	if (sectors > dev->dev_attrib.hw_max_sectors) {
d6e0175c CH	572	printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
	573	" big sectors %u exceeds backend hw_max_sectors:"
	574	" %u\n", cdb[0], sectors,
0fd97ccf	575	dev->dev_attrib.hw_max_sectors);
d6e0175c CH	576	goto out_invalid_cdb_field;
	577	}
	578
1fd032ee CH	579	end_lba = dev->transport->get_blocks(dev) + 1;
	580	if (cmd->t_task_lba + sectors > end_lba) {
	581	pr_err("cmd exceeds last lba %llu "
	582	"(lba %llu, sectors %u)\n",
	583	end_lba, cmd->t_task_lba, sectors);
	584	goto out_invalid_cdb_field;
	585	}
	586
	587	size = sbc_get_size(cmd, sectors);
d6e0175c CH	588	}
d6e0175c CH	589
1fd032ee CH	590	ret = target_cmd_size_check(cmd, size);
	591	if (ret < 0)
	592	return ret;
	593
d6e0175c CH	594	return 0;
	595
	596	out_unsupported_cdb:
	597	cmd->se_cmd_flags \|= SCF_SCSI_CDB_EXCEPTION;
	598	cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
	599	return -EINVAL;
	600	out_invalid_cdb_field:
	601	cmd->se_cmd_flags \|= SCF_SCSI_CDB_EXCEPTION;
	602	cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
	603	return -EINVAL;
	604	}
	605	EXPORT_SYMBOL(sbc_parse_cdb);
6f23ac8a	606
6f23ac8a CH	607	u32 sbc_get_device_type(struct se_device *dev)
	608	{
	609	return TYPE_DISK;
	610	}
	611	EXPORT_SYMBOL(sbc_get_device_type);