Add support for STARTSTOPUNIT command

lib/libiscsi.def

@@ -61,6 +61,8 @@ iscsi_set_isid_reserved
 iscsi_set_session_type
 iscsi_set_targetname
 iscsi_set_tcp_keepalive
+iscsi_startstopunit_sync
+iscsi_startstopunit_task
 iscsi_synchronizecache10_sync
 iscsi_synchronizecache10_task
 iscsi_synchronizecache16_sync
@@ -115,7 +117,9 @@ scsi_cdb_read6
 scsi_cdb_readcapacity10
 scsi_cdb_readcapacity16
 scsi_cdb_serviceactionin16
+scsi_cdb_startstopunit
 scsi_cdb_synchronizecache10
+scsi_cdb_synchronizecache16
 scsi_cdb_testunitready
 scsi_cdb_unmap
 scsi_cdb_verify10

lib/libiscsi.syms

@@ -59,6 +59,8 @@ iscsi_set_isid_reserved
 iscsi_set_session_type
 iscsi_set_targetname
 iscsi_set_tcp_keepalive
+iscsi_startstopunit_sync
+iscsi_startstopunit_task
 iscsi_synchronizecache10_sync
 iscsi_synchronizecache10_task
 iscsi_synchronizecache16_sync
@@ -113,7 +115,9 @@ scsi_cdb_read6
 scsi_cdb_readcapacity10
 scsi_cdb_readcapacity16
 scsi_cdb_serviceactionin16
+scsi_cdb_startstopunit
 scsi_cdb_synchronizecache10
+scsi_cdb_synchronizecache16
 scsi_cdb_testunitready
 scsi_cdb_unmap
 scsi_cdb_verify10

lib/scsi-command.c

@@ -1168,6 +1168,30 @@ iscsi_modesense6_task(struct iscsi_context *iscsi, int lun, int dbd, int pc,
 	return task;
 }
 
+struct scsi_task *
+iscsi_startstopunit_task(struct iscsi_context *iscsi, int lun,
+			 int immed, int pcm, int pc,
+			 int no_flush, int loej, int start,
+			 iscsi_command_cb cb, void *private_data)
+{
+	struct scsi_task *task;
+
+	task = scsi_cdb_startstopunit(immed, pcm, pc, no_flush,
+				      loej, start);
+	if (task == NULL) {
+		iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
+				"startstopunit cdb.");
+		return NULL;
+	}
+	if (iscsi_scsi_command_async(iscsi, lun, task, cb, NULL,
+				       private_data) != 0) {
+		scsi_free_scsi_task(task);
+		return NULL;
+	}
+
+	return task;
+}
+
 struct scsi_task *
 iscsi_synchronizecache10_task(struct iscsi_context *iscsi, int lun, int lba,
 			       int num_blocks, int syncnv, int immed,

lib/scsi-lowlevel.c

@@ -1521,6 +1521,51 @@ scsi_modesense_datain_unmarshall(struct scsi_task *task)
 	return ms;
 }
 
+/*
+ * STARTSTOPUNIT
+ */
+struct scsi_task *
+scsi_cdb_startstopunit(int immed, int pcm, int pc, int no_flush, int loej, int start)
+{
+	struct scsi_task *task;
+
+	task = malloc(sizeof(struct scsi_task));
+	if (task == NULL) {
+		return NULL;
+	}
+
+	memset(task, 0, sizeof(struct scsi_task));
+	task->cdb[0]   = SCSI_OPCODE_STARTSTOPUNIT;
+
+	if (immed) {
+		task->cdb[1] |= 0x01;
+	}
+	task->cdb[3] |= pcm & 0x0f; 
+	task->cdb[4] |= (pc << 4) & 0xf0;
+	if (no_flush) {
+		task->cdb[4] |= 0x04;
+	}
+	if (loej) {
+		task->cdb[4] |= 0x02;
+	}
+	if (start) {
+		task->cdb[4] |= 0x01;
+	}
+
+
+	task->cdb_size   = 6;
+	task->xfer_dir   = SCSI_XFER_NONE;
+	task->expxferlen = 0;
+
+	task->params.startstopunit.immed    = immed;
+	task->params.startstopunit.pcm      = pcm;
+	task->params.startstopunit.pc       = pc;
+	task->params.startstopunit.no_flush = no_flush;
+	task->params.startstopunit.loej     = loej;
+	task->params.startstopunit.start    = start;
+
+	return task;
+}
 
 /*
  * SYNCHRONIZECACHE10

lib/sync.c

@@ -397,6 +397,28 @@ iscsi_synchronizecache10_sync(struct iscsi_context *iscsi, int lun, int lba,
 	return state.task;
 }
 
+struct scsi_task *
+iscsi_startstopunit_sync(struct iscsi_context *iscsi, int lun,
+			 int immed, int pcm, int pc,
+			 int no_flush, int loej, int start)
+{
+	struct iscsi_sync_state state;
+
+	memset(&state, 0, sizeof(state));
+
+	if (iscsi_startstopunit_task(iscsi, lun, immed, pcm, pc,
+				     no_flush, loej, start,
+				     scsi_sync_cb, &state) == NULL) {
+		iscsi_set_error(iscsi,
+				"Failed to send StartStopUnit command");
+		return NULL;
+	}
+
+	event_loop(iscsi, &state);
+
+	return state.task;
+}
+
 struct scsi_task *
 iscsi_synchronizecache16_sync(struct iscsi_context *iscsi, int lun, uint64_t lba,
 			      uint32_t num_blocks, int syncnv, int immed)