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>

drivers/target/Makefile

@@ -10,6 +10,7 @@ target_core_mod-y		:= target_core_configfs.o \
 				   target_core_tpg.o \
 				   target_core_transport.o \
 				   target_core_cdb.o \
+				   target_core_spc.o \
 				   target_core_ua.o \
 				   target_core_rd.o \
 				   target_core_stat.o

drivers/target/target_core_internal.h

@@ -96,6 +96,9 @@ int	core_tpg_post_addlun(struct se_portal_group *, struct se_lun *,
 struct se_lun *core_tpg_pre_dellun(struct se_portal_group *, u32 unpacked_lun);
 int	core_tpg_post_dellun(struct se_portal_group *, struct se_lun *);
 
+/* target_core_spc.c */
+int	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size, bool passthrough);
+
 /* target_core_transport.c */
 extern struct kmem_cache *se_tmr_req_cache;
 

drivers/target/target_core_spc.c

@@ -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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.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_pr.h"
+#include "target_core_ua.h"
+
+
+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;
+
+		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);

drivers/target/target_core_transport.c

@@ -2658,26 +2658,8 @@ static int transport_generic_cmd_sequencer(
 			size = (cdb[8] << 8) + cdb[9];
 		}
 		break;
-	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 GPCMD_READ_BUFFER_CAPACITY:
 	case GPCMD_SEND_OPC:
-	case LOG_SELECT:
-	case LOG_SENSE:
 		size = (cdb[7] << 8) + cdb[8];
 		break;
 	case READ_BLOCK_LIMITS:
@@ -2689,16 +2671,6 @@ static int transport_generic_cmd_sequencer(
 	case GPCMD_READ_TRACK_RZONE_INFO:
 		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 GPCMD_MECHANISM_STATUS:
 	case GPCMD_READ_DVD_STRUCTURE:
 		size = (cdb[8] << 8) + cdb[9];
@@ -2725,17 +2697,6 @@ static int transport_generic_cmd_sequencer(
 			size = (cdb[8] << 8) + cdb[9];
 		}
 		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 READ_BUFFER:
 		size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
 		break;
@@ -2745,10 +2706,6 @@ static int transport_generic_cmd_sequencer(
 			cmd->execute_cmd = target_emulate_readcapacity;
 		break;
 	case READ_MEDIA_SERIAL_NUMBER:
-	case SECURITY_PROTOCOL_IN:
-	case SECURITY_PROTOCOL_OUT:
-		size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
-		break;
 	case SERVICE_ACTION_IN:
 		switch (cmd->t_task_cdb[1] & 0x1f) {
 		case SAI_READ_CAPACITY_16:
@@ -2767,17 +2724,9 @@ static int transport_generic_cmd_sequencer(
 		/*FALLTHROUGH*/
 	case ACCESS_CONTROL_IN:
 	case ACCESS_CONTROL_OUT:
-	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;
 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
 #if 0
 	case GPCMD_READ_CD:
@@ -2788,52 +2737,9 @@ static int transport_generic_cmd_sequencer(
 	case READ_TOC:
 		size = cdb[8];
 		break;
-	case REQUEST_SENSE:
-		size = cdb[4];
-		if (!passthrough)
-			cmd->execute_cmd = target_emulate_request_sense;
-		break;
 	case READ_ELEMENT_STATUS:
 		size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
 		break;
-	case WRITE_BUFFER:
-		size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
-		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 RELEASE:
-	case RELEASE_10:
-		/*
-		 * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
-		 * Assume the passthrough or $FABRIC_MOD will tell us about it.
-		*/
-		if (cdb[0] == RELEASE_10)
-			size = (cdb[7] << 8) | cdb[8];
-		else
-			size = cmd->data_length;
-
-		if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
-			cmd->execute_cmd = target_scsi2_reservation_release;
-		break;
 	case SYNCHRONIZE_CACHE:
 	case SYNCHRONIZE_CACHE_16:
 		/*
@@ -2916,7 +2822,6 @@ static int transport_generic_cmd_sequencer(
 	case SEEK_10:
 	case SPACE:
 	case START_STOP:
-	case TEST_UNIT_READY:
 	case VERIFY:
 	case WRITE_FILEMARKS:
 		if (!passthrough)
@@ -2928,16 +2833,6 @@ static int transport_generic_cmd_sequencer(
 	case GPCMD_SET_SPEED:
 	case MOVE_MEDIUM:
 		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 GET_EVENT_STATUS_NOTIFICATION:
 		size = (cdb[7] << 8) | cdb[8];
 		break;
@@ -2973,10 +2868,9 @@ static int transport_generic_cmd_sequencer(
 		}
 		break;
 	default:
-		pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
-			" 0x%02x, sending CHECK_CONDITION.\n",
-			cmd->se_tfo->get_fabric_name(), cdb[0]);
-		goto out_unsupported_cdb;
+		ret = spc_parse_cdb(cmd, &size, passthrough);
+		if (ret)
+			return ret;
 	}
 
 	ret = target_cmd_size_check(cmd, size);