add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/target/loopback/tcm_loop.c
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@@ -128,14 +128,6 @@
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 		set_host_byte(sc, DID_ERROR);
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 		goto out_done;
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 	}
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-	if (scsi_bidi_cmnd(sc)) {
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-		struct scsi_data_buffer *sdb = scsi_in(sc);
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-
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-		sgl_bidi = sdb->table.sgl;
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-		sgl_bidi_count = sdb->table.nents;
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-		se_cmd->se_cmd_flags |= SCF_BIDI;
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-
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-	}
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 	transfer_length = scsi_transfer_length(sc);
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 	if (!scsi_prot_sg_count(sc) &&
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@@ -304,12 +296,6 @@
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 	return FAILED;
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 }
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-static int tcm_loop_slave_alloc(struct scsi_device *sd)
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-{
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-	blk_queue_flag_set(QUEUE_FLAG_BIDI, sd->request_queue);
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-	return 0;
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-}
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-
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 static struct scsi_host_template tcm_loop_driver_template = {
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 	.show_info		= tcm_loop_show_info,
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 	.proc_name		= "tcm_loopback",
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@@ -324,8 +310,7 @@
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 	.sg_tablesize		= 256,
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 	.cmd_per_lun		= 1024,
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 	.max_sectors		= 0xFFFF,
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-	.use_clustering		= DISABLE_CLUSTERING,
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-	.slave_alloc		= tcm_loop_slave_alloc,
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+	.dma_boundary		= PAGE_SIZE - 1,
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 	.module			= THIS_MODULE,
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 	.track_queue_depth	= 1,
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 };
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@@ -409,6 +394,7 @@
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 	ret = device_register(&tl_hba->dev);
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 	if (ret) {
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 		pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
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+		put_device(&tl_hba->dev);
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 		return -ENODEV;
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 	}
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@@ -458,11 +444,6 @@
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 	root_device_unregister(tcm_loop_primary);
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 	pr_debug("Releasing TCM Loop Core BUS\n");
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-}
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-
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-static char *tcm_loop_get_fabric_name(void)
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-{
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-	return "loopback";
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 }
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 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
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@@ -565,37 +546,15 @@
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 	return 0;
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 }
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-static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
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-{
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-	return 0;
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-}
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-
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-static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
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+static int tcm_loop_queue_data_or_status(const char *func,
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+		struct se_cmd *se_cmd, u8 scsi_status)
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 {
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 	struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
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 				struct tcm_loop_cmd, tl_se_cmd);
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 	struct scsi_cmnd *sc = tl_cmd->sc;
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 	pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
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-		 __func__, sc, sc->cmnd[0]);
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-
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-	sc->result = SAM_STAT_GOOD;
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-	set_host_byte(sc, DID_OK);
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-	if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
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-	    (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
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-		scsi_set_resid(sc, se_cmd->residual_count);
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-	sc->scsi_done(sc);
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-	return 0;
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-}
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-
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-static int tcm_loop_queue_status(struct se_cmd *se_cmd)
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-{
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-	struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
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-				struct tcm_loop_cmd, tl_se_cmd);
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-	struct scsi_cmnd *sc = tl_cmd->sc;
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-
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-	pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
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-		 __func__, sc, sc->cmnd[0]);
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+		 func, sc, sc->cmnd[0]);
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 	if (se_cmd->sense_buffer &&
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 	   ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
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@@ -606,7 +565,7 @@
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 		sc->result = SAM_STAT_CHECK_CONDITION;
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 		set_driver_byte(sc, DRIVER_SENSE);
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 	} else
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-		sc->result = se_cmd->scsi_status;
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+		sc->result = scsi_status;
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 	set_host_byte(sc, DID_OK);
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 	if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
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@@ -614,6 +573,17 @@
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 		scsi_set_resid(sc, se_cmd->residual_count);
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 	sc->scsi_done(sc);
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 	return 0;
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+}
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+
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+static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
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+{
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+	return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);
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+}
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+
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+static int tcm_loop_queue_status(struct se_cmd *se_cmd)
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+{
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+	return tcm_loop_queue_data_or_status(__func__,
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+					     se_cmd, se_cmd->scsi_status);
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 }
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 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
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@@ -1103,7 +1073,7 @@
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 	 */
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 	ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
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 	if (ret)
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-		goto out;
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+		return ERR_PTR(ret);
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 	sh = tl_hba->sh;
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 	tcm_loop_hba_no_cnt++;
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@@ -1149,8 +1119,7 @@
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 static const struct target_core_fabric_ops loop_ops = {
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 	.module				= THIS_MODULE,
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-	.name				= "loopback",
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-	.get_fabric_name		= tcm_loop_get_fabric_name,
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+	.fabric_name			= "loopback",
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 	.tpg_get_wwn			= tcm_loop_get_endpoint_wwn,
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 	.tpg_get_tag			= tcm_loop_get_tag,
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 	.tpg_check_demo_mode		= tcm_loop_check_demo_mode,
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@@ -1165,7 +1134,6 @@
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 	.release_cmd			= tcm_loop_release_cmd,
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 	.sess_get_index			= tcm_loop_sess_get_index,
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 	.write_pending			= tcm_loop_write_pending,
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-	.write_pending_status		= tcm_loop_write_pending_status,
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 	.set_default_node_attributes	= tcm_loop_set_default_node_attributes,
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 	.get_cmd_state			= tcm_loop_get_cmd_state,
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 	.queue_data_in			= tcm_loop_queue_data_in,