Add PREVENTALLOWMEDIUMREMOVAL support

lib/libiscsi.def

@@ -30,6 +30,8 @@ iscsi_prefetch10_sync
 iscsi_prefetch10_task
 iscsi_prefetch16_sync
 iscsi_prefetch16_task
+iscsi_preventallow_sync
+iscsi_preventallow_task
 iscsi_queue_length
 iscsi_read10_sync
 iscsi_read10_task
@@ -110,6 +112,7 @@ scsi_cdb_get_lba_status
 scsi_cdb_modesense6
 scsi_cdb_prefetch10
 scsi_cdb_prefetch16
+scsi_cdb_preventallow
 scsi_cdb_read10
 scsi_cdb_read12
 scsi_cdb_read16

lib/libiscsi.syms

@@ -28,6 +28,8 @@ iscsi_prefetch10_sync
 iscsi_prefetch10_task
 iscsi_prefetch16_sync
 iscsi_prefetch16_task
+iscsi_preventallow_sync
+iscsi_preventallow_task
 iscsi_queue_length
 iscsi_read10_sync
 iscsi_read10_task
@@ -108,6 +110,7 @@ scsi_cdb_get_lba_status
 scsi_cdb_modesense6
 scsi_cdb_prefetch10
 scsi_cdb_prefetch16
+scsi_cdb_preventallow
 scsi_cdb_read10
 scsi_cdb_read12
 scsi_cdb_read16

lib/scsi-command.c

@@ -1192,6 +1192,28 @@ iscsi_startstopunit_task(struct iscsi_context *iscsi, int lun,
 	return task;
 }
 
+struct scsi_task *
+iscsi_preventallow_task(struct iscsi_context *iscsi, int lun,
+			int prevent,
+			iscsi_command_cb cb, void *private_data)
+{
+	struct scsi_task *task;
+
+	task = scsi_cdb_preventallow(prevent);
+	if (task == NULL) {
+		iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
+				"PreventAllowMediumRemoval 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

@@ -1567,6 +1567,33 @@ scsi_cdb_startstopunit(int immed, int pcm, int pc, int no_flush, int loej, int s
 	return task;
 }
 
+/*
+ * PREVENTALLOWMEDIUMREMOVAL
+ */
+struct scsi_task *
+scsi_cdb_preventallow(int prevent)
+{
+	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_PREVENTALLOW;
+
+	task->cdb[4] = prevent & 0x03;
+
+	task->cdb_size   = 6;
+	task->xfer_dir   = SCSI_XFER_NONE;
+	task->expxferlen = 0;
+
+	task->params.preventallow.prevent = prevent;
+
+	return task;
+}
+
 /*
  * SYNCHRONIZECACHE10
  */

lib/sync.c

@@ -419,6 +419,26 @@ iscsi_startstopunit_sync(struct iscsi_context *iscsi, int lun,
 	return state.task;
 }
 
+struct scsi_task *
+iscsi_preventallow_sync(struct iscsi_context *iscsi, int lun,
+			int prevent)
+{
+	struct iscsi_sync_state state;
+
+	memset(&state, 0, sizeof(state));
+
+	if (iscsi_preventallow_task(iscsi, lun, prevent,
+				    scsi_sync_cb, &state) == NULL) {
+		iscsi_set_error(iscsi,
+				"Failed to send PreventAllowMediumRemoval 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)