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target: split parsing of SPC commands into a separate helper
(nab: Add EXPORT_SYMBOL usage for spc_parse_cdb) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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Christoph Hellwig
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Nicholas Bellinger
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Jul 17, 2012
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,169 @@ | ||
| /* | ||
| * SCSI Primary Commands (SPC) 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. | ||
| */ | ||
|
|
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| #include <linux/kernel.h> | ||
| #include <linux/module.h> | ||
| #include <asm/unaligned.h> | ||
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| #include <scsi/scsi.h> | ||
| #include <scsi/scsi_tcq.h> | ||
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| #include <target/target_core_base.h> | ||
| #include <target/target_core_backend.h> | ||
| #include <target/target_core_fabric.h> | ||
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| #include "target_core_internal.h" | ||
| #include "target_core_pr.h" | ||
| #include "target_core_ua.h" | ||
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| int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough) | ||
| { | ||
| struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; | ||
| unsigned char *cdb = cmd->t_task_cdb; | ||
|
|
||
| switch (cdb[0]) { | ||
| case MODE_SELECT: | ||
| *size = cdb[4]; | ||
| break; | ||
| case MODE_SELECT_10: | ||
| *size = (cdb[7] << 8) + cdb[8]; | ||
| break; | ||
| case MODE_SENSE: | ||
| *size = cdb[4]; | ||
| if (!passthrough) | ||
| cmd->execute_cmd = target_emulate_modesense; | ||
| break; | ||
| case MODE_SENSE_10: | ||
| *size = (cdb[7] << 8) + cdb[8]; | ||
| if (!passthrough) | ||
| cmd->execute_cmd = target_emulate_modesense; | ||
| break; | ||
| case LOG_SELECT: | ||
| case LOG_SENSE: | ||
| *size = (cdb[7] << 8) + cdb[8]; | ||
| break; | ||
| case PERSISTENT_RESERVE_IN: | ||
| if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) | ||
| cmd->execute_cmd = target_scsi3_emulate_pr_in; | ||
| *size = (cdb[7] << 8) + cdb[8]; | ||
| break; | ||
| case PERSISTENT_RESERVE_OUT: | ||
| if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS) | ||
| cmd->execute_cmd = target_scsi3_emulate_pr_out; | ||
| *size = (cdb[7] << 8) + cdb[8]; | ||
| break; | ||
| case RELEASE: | ||
| case RELEASE_10: | ||
| if (cdb[0] == RELEASE_10) | ||
| *size = (cdb[7] << 8) | cdb[8]; | ||
| else | ||
| *size = cmd->data_length; | ||
|
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| if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) | ||
| cmd->execute_cmd = target_scsi2_reservation_release; | ||
| break; | ||
| case RESERVE: | ||
| case RESERVE_10: | ||
| /* | ||
| * The SPC-2 RESERVE does not contain a size in the SCSI CDB. | ||
| * Assume the passthrough or $FABRIC_MOD will tell us about it. | ||
| */ | ||
| if (cdb[0] == RESERVE_10) | ||
| *size = (cdb[7] << 8) | cdb[8]; | ||
| else | ||
| *size = cmd->data_length; | ||
|
|
||
| /* | ||
| * Setup the legacy emulated handler for SPC-2 and | ||
| * >= SPC-3 compatible reservation handling (CRH=1) | ||
| * Otherwise, we assume the underlying SCSI logic is | ||
| * is running in SPC_PASSTHROUGH, and wants reservations | ||
| * emulation disabled. | ||
| */ | ||
| if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH) | ||
| cmd->execute_cmd = target_scsi2_reservation_reserve; | ||
| break; | ||
| case REQUEST_SENSE: | ||
| *size = cdb[4]; | ||
| if (!passthrough) | ||
| cmd->execute_cmd = target_emulate_request_sense; | ||
| break; | ||
| case INQUIRY: | ||
| *size = (cdb[3] << 8) + cdb[4]; | ||
|
|
||
| /* | ||
| * Do implict HEAD_OF_QUEUE processing for INQUIRY. | ||
| * See spc4r17 section 5.3 | ||
| */ | ||
| if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | ||
| cmd->sam_task_attr = MSG_HEAD_TAG; | ||
| if (!passthrough) | ||
| cmd->execute_cmd = target_emulate_inquiry; | ||
| break; | ||
| case SECURITY_PROTOCOL_IN: | ||
| case SECURITY_PROTOCOL_OUT: | ||
| *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | ||
| break; | ||
| case EXTENDED_COPY: | ||
| case READ_ATTRIBUTE: | ||
| case RECEIVE_COPY_RESULTS: | ||
| case WRITE_ATTRIBUTE: | ||
| *size = (cdb[10] << 24) | (cdb[11] << 16) | | ||
| (cdb[12] << 8) | cdb[13]; | ||
| break; | ||
| case RECEIVE_DIAGNOSTIC: | ||
| case SEND_DIAGNOSTIC: | ||
| *size = (cdb[3] << 8) | cdb[4]; | ||
| break; | ||
| case WRITE_BUFFER: | ||
| *size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; | ||
| break; | ||
| case REPORT_LUNS: | ||
| cmd->execute_cmd = target_report_luns; | ||
| *size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; | ||
| /* | ||
| * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS | ||
| * See spc4r17 section 5.3 | ||
| */ | ||
| if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) | ||
| cmd->sam_task_attr = MSG_HEAD_TAG; | ||
| break; | ||
| case TEST_UNIT_READY: | ||
| if (!passthrough) | ||
| cmd->execute_cmd = target_emulate_noop; | ||
| break; | ||
| default: | ||
| pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode" | ||
| " 0x%02x, sending CHECK_CONDITION.\n", | ||
| cmd->se_tfo->get_fabric_name(), cdb[0]); | ||
| cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | ||
| cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
| EXPORT_SYMBOL(spc_parse_cdb); |
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