/*
* SCSI Block Commands (SBC) parsing and emulation.
*
* (c) Copyright 2002-2013 Datera, Inc.
*
* 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 <linux/crc-t10dif.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_tcq.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"
#include "target_core_alua.h"
static sense_reason_t
sbc_emulate_readcapacity(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *cdb = cmd->t_task_cdb;
unsigned long long blocks_long = dev->transport->get_blocks(dev);
unsigned char *rbuf;
unsigned char buf[8];
u32 blocks;
/*
* SBC-2 says:
* If the PMI bit is set to zero and the LOGICAL BLOCK
* ADDRESS field is not set to zero, the device server shall
* terminate the command with CHECK CONDITION status with
* the sense key set to ILLEGAL REQUEST and the additional
* sense code set to INVALID FIELD IN CDB.
*
* In SBC-3, these fields are obsolete, but some SCSI
* compliance tests actually check this, so we might as well
* follow SBC-2.
*/
if (!(cdb[8] & 1) && !!(cdb[2] | cdb[3] | cdb[4] | cdb[5]))
return TCM_INVALID_CDB_FIELD;
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, 