target: move ref_cmd from the generic se_tmr_req into iscsi code

Also remove the unused ref_task_lun field in struct se_tmr_req.

(nab: Add missing TASK_REASSIGN ref_lun vs. ref_cmd orig_fe_lun checks
      in iscsit_tmr_task_reassign)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/iscsi/iscsi_target_core.h

@@ -481,6 +481,7 @@ struct iscsi_tmr_req {
 	bool			task_reassign:1;
 	u32			ref_cmd_sn;
 	u32			exp_data_sn;
+	struct iscsi_cmd	*ref_cmd;
 	struct iscsi_conn_recovery *conn_recovery;
 	struct se_tmr_req	*se_tmr_req;
 };

drivers/target/iscsi/iscsi_target_tmr.c

@@ -19,6 +19,7 @@
  ******************************************************************************/
 
 #include <asm/unaligned.h>
+#include <scsi/scsi_device.h>
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
@@ -61,7 +62,7 @@ u8 iscsit_tmr_abort_task(
 	}
 
 	se_tmr->ref_task_tag		= hdr->rtt;
-	se_tmr->ref_cmd			= &ref_cmd->se_cmd;
+	tmr_req->ref_cmd		= ref_cmd;
 	tmr_req->ref_cmd_sn		= hdr->refcmdsn;
 	tmr_req->exp_data_sn		= hdr->exp_datasn;
 
@@ -121,7 +122,7 @@ u8 iscsit_tmr_task_reassign(
 	struct iscsi_tmr_req *tmr_req = cmd->tmr_req;
 	struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
 	struct iscsi_tm *hdr = (struct iscsi_tm *) buf;
-	int ret;
+	int ret, ref_lun;
 
 	pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x,"
 		" RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n",
@@ -155,9 +156,16 @@ u8 iscsit_tmr_task_reassign(
 		return ISCSI_TMF_RSP_REJECTED;
 	}
 
+	ref_lun = scsilun_to_int(&hdr->lun);
+	if (ref_lun != ref_cmd->se_cmd.orig_fe_lun) {
+		pr_err("Unable to perform connection recovery for"
+			" differing ref_lun: %d ref_cmd orig_fe_lun: %u\n",
+			ref_lun, ref_cmd->se_cmd.orig_fe_lun);
+		return ISCSI_TMF_RSP_REJECTED;
+	}
+
 	se_tmr->ref_task_tag		= hdr->rtt;
-	se_tmr->ref_cmd			= &ref_cmd->se_cmd;
-	se_tmr->ref_task_lun		= get_unaligned_le64(&hdr->lun);
+	tmr_req->ref_cmd		= ref_cmd;
 	tmr_req->ref_cmd_sn		= hdr->refcmdsn;
 	tmr_req->exp_data_sn		= hdr->exp_datasn;
 	tmr_req->conn_recovery		= cr;
@@ -191,9 +199,7 @@ static int iscsit_task_reassign_complete_nop_out(
 	struct iscsi_tmr_req *tmr_req,
 	struct iscsi_conn *conn)
 {
-	struct se_tmr_req *se_tmr = tmr_req->se_tmr_req;
-	struct se_cmd *se_cmd = se_tmr->ref_cmd;
-	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	struct iscsi_cmd *cmd = tmr_req->ref_cmd;
 	struct iscsi_conn_recovery *cr;
 
 	if (!cmd->cr) {
@@ -360,9 +366,7 @@ static int iscsit_task_reassign_complete_scsi_cmnd(
 	struct iscsi_tmr_req *tmr_req,
 	struct iscsi_conn *conn)
 {
-	struct se_tmr_req *se_tmr = tmr_req->se_tmr_req;
-	struct se_cmd *se_cmd = se_tmr->ref_cmd;
-	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	struct iscsi_cmd *cmd = tmr_req->ref_cmd;
 	struct iscsi_conn_recovery *cr;
 
 	if (!cmd->cr) {
@@ -385,7 +389,7 @@ static int iscsit_task_reassign_complete_scsi_cmnd(
 	list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 	spin_unlock_bh(&conn->cmd_lock);
 
-	if (se_cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
+	if (cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
 		cmd->i_state = ISTATE_SEND_STATUS;
 		iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 		return 0;
@@ -411,17 +415,14 @@ static int iscsit_task_reassign_complete(
 	struct iscsi_tmr_req *tmr_req,
 	struct iscsi_conn *conn)
 {
-	struct se_tmr_req *se_tmr = tmr_req->se_tmr_req;
-	struct se_cmd *se_cmd;
 	struct iscsi_cmd *cmd;
 	int ret = 0;
 
-	if (!se_tmr->ref_cmd) {
+	if (!tmr_req->ref_cmd) {
 		pr_err("TMR Request is missing a RefCmd struct iscsi_cmd.\n");
 		return -1;
 	}
-	se_cmd = se_tmr->ref_cmd;
-	cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	cmd = tmr_req->ref_cmd;
 
 	cmd->conn = conn;
 
@@ -547,9 +548,7 @@ int iscsit_task_reassign_prepare_write(
 	struct iscsi_tmr_req *tmr_req,
 	struct iscsi_conn *conn)
 {
-	struct se_tmr_req *se_tmr = tmr_req->se_tmr_req;
-	struct se_cmd *se_cmd = se_tmr->ref_cmd;
-	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	struct iscsi_cmd *cmd = tmr_req->ref_cmd;
 	struct iscsi_pdu *pdu = NULL;
 	struct iscsi_r2t *r2t = NULL, *r2t_tmp;
 	int first_incomplete_r2t = 1, i = 0;
@@ -782,14 +781,12 @@ int iscsit_check_task_reassign_expdatasn(
 	struct iscsi_tmr_req *tmr_req,
 	struct iscsi_conn *conn)
 {
-	struct se_tmr_req *se_tmr = tmr_req->se_tmr_req;
-	struct se_cmd *se_cmd = se_tmr->ref_cmd;
-	struct iscsi_cmd *ref_cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	struct iscsi_cmd *ref_cmd = tmr_req->ref_cmd;
 
 	if (ref_cmd->iscsi_opcode != ISCSI_OP_SCSI_CMD)
 		return 0;
 
-	if (se_cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
+	if (ref_cmd->se_cmd.se_cmd_flags & SCF_SENT_CHECK_CONDITION)
 		return 0;
 
 	if (ref_cmd->data_direction == DMA_NONE)

include/target/target_core_base.h

@@ -483,11 +483,8 @@ struct se_tmr_req {
 	int			call_transport;
 	/* Reference to ITT that Task Mgmt should be performed */
 	u32			ref_task_tag;
-	/* 64-bit encoded SAM LUN from $FABRIC_MOD TMR header */
-	u64			ref_task_lun;
 	void 			*fabric_tmr_ptr;
 	struct se_cmd		*task_cmd;
-	struct se_cmd		*ref_cmd;
 	struct se_device	*tmr_dev;
 	struct se_lun		*tmr_lun;
 	struct list_head	tmr_list;