Re: [PATCH-v2 04/15] target: Move cmd->prot_op check into target_check_write_prot

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On 3/30/2015 6:28 AM, Nicholas A. Bellinger wrote:
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

This patch moves the existing target_execute_cmd() check for
cmd->prot_op into it's own function, so it's easier to add
future support for WRITE STRIP.

Cc: Martin Petersen <martin.petersen@xxxxxxxxxx>
Cc: Sagi Grimberg <sagig@xxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
  drivers/target/target_core_transport.c | 31 ++++++++++++++++++++++---------
  1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index aef989e..6a24151 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1738,6 +1738,25 @@ void __target_execute_cmd(struct se_cmd *cmd)
  	}
  }

+static int target_check_write_prot(struct se_cmd *cmd)

This is not really a check routine, it actually does something with
the protection information. Maybe a better name would be
target_write_prot_action() or something in that form.

+{
+	/*
+	 * Perform WRITE_INSERT of PI using software emulation when backend
+	 * device has PI enabled, if the transport has not already generated
+	 * PI using hardware WRITE_INSERT offload.
+	 */
+	switch (cmd->prot_op) {
+	case TARGET_PROT_DOUT_INSERT:
+		if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
+			sbc_dif_generate(cmd);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
  static bool target_handle_task_attr(struct se_cmd *cmd)
  {
  	struct se_device *dev = cmd->se_dev;
@@ -1817,15 +1836,9 @@ void target_execute_cmd(struct se_cmd *cmd)
  	cmd->t_state = TRANSPORT_PROCESSING;
  	cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
  	spin_unlock_irq(&cmd->t_state_lock);
-	/*
-	 * Perform WRITE_INSERT of PI using software emulation when backend
-	 * device has PI enabled, if the transport has not already generated
-	 * PI using hardware WRITE_INSERT offload.
-	 */
-	if (cmd->prot_op == TARGET_PROT_DOUT_INSERT) {
-		if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
-			sbc_dif_generate(cmd);
-	}
+
+	if (target_check_write_prot(cmd))
+		return;

  	if (target_handle_task_attr(cmd)) {
  		spin_lock_irq(&cmd->t_state_lock);


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