From: Mike Christie <mchristi@redhat.com>
Date: Wed, 31 May 2017 15:52:39 -0500
Subject: target: add helper to copy sense to se_cmd buffer
Git-commit: c6d66aba98a39cfed206c5c61f0a604ba09b26ce
Patch-mainline: v4.13-rc1
References: fate#323946

This adds a helper to copy sense from backend module buffer to
the se_cmd's sense buffer.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/target/target_core_transport.c | 18 ++++++++++++++++++
 include/target/target_core_backend.h   |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index a8f943e325eb..341025a3cbb7 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -704,6 +704,24 @@ static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
 	return cmd->sense_buffer;
 }
 
+void transport_copy_sense_to_cmd(struct se_cmd *cmd, unsigned char *sense)
+{
+	unsigned char *cmd_sense_buf;
+	unsigned long flags;
+
+	spin_lock_irqsave(&cmd->t_state_lock, flags);
+	cmd_sense_buf = transport_get_sense_buffer(cmd);
+	if (!cmd_sense_buf) {
+		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+		return;
+	}
+
+	cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
+	memcpy(cmd_sense_buf, sense, cmd->scsi_sense_length);
+	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+}
+EXPORT_SYMBOL(transport_copy_sense_to_cmd);
+
 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 {
 	struct se_device *dev = cmd->se_dev;
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index 1f2b7007f2df..3757f5f54e03 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -73,6 +73,8 @@ struct sbc_ops {
 void	target_complete_cmd(struct se_cmd *, u8);
 void	target_complete_cmd_with_length(struct se_cmd *, u8, int);
 
+void	transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *);
+
 sense_reason_t	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
 sense_reason_t	spc_emulate_report_luns(struct se_cmd *cmd);
 sense_reason_t	spc_emulate_inquiry_std(struct se_cmd *, unsigned char *);