Add support for PERSISTENT_RESERVE_IN and add a simple test for READ_KEYS

lib/iscsi-command.c

@@ -1254,6 +1254,28 @@ iscsi_synchronizecache16_task(struct iscsi_context *iscsi, int lun, uint64_t lba
 	return task;
 }
 
+struct scsi_task *
+iscsi_persistent_reserve_in_task(struct iscsi_context *iscsi, int lun,
+				 int sa, uint16_t xferlen,
+				 iscsi_command_cb cb, void *private_data)
+{
+	struct scsi_task *task;
+
+	task = scsi_cdb_persistent_reserve_in(sa, xferlen);
+	if (task == NULL) {
+		iscsi_set_error(iscsi, "Out-of-memory: Failed to create "
+				"persistent-reserver-in 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_prefetch10_task(struct iscsi_context *iscsi, int lun, uint32_t lba,
 		      int num_blocks, int immed, int group,

lib/libiscsi.def

@@ -28,6 +28,8 @@ iscsi_modesense6_task
 iscsi_nop_out_async
 iscsi_parse_full_url
 iscsi_parse_portal_url
+iscsi_persistent_reserve_in_task
+iscsi_persistent_reserve_in_sync
 iscsi_prefetch10_sync
 iscsi_prefetch10_task
 iscsi_prefetch16_sync
@@ -133,6 +135,7 @@ scsi_association_to_str
 scsi_cdb_inquiry
 scsi_cdb_get_lba_status
 scsi_cdb_modesense6
+scsi_cdb_persistent_reserve_in
 scsi_cdb_prefetch10
 scsi_cdb_prefetch16
 scsi_cdb_preventallow

lib/libiscsi.syms

@@ -26,6 +26,8 @@ iscsi_modesense6_task
 iscsi_nop_out_async
 iscsi_parse_full_url
 iscsi_parse_portal_url
+iscsi_persistent_reserve_in_task
+iscsi_persistent_reserve_in_sync
 iscsi_prefetch10_sync
 iscsi_prefetch10_task
 iscsi_prefetch16_sync
@@ -131,6 +133,7 @@ scsi_association_to_str
 scsi_cdb_inquiry
 scsi_cdb_get_lba_status
 scsi_cdb_modesense6
+scsi_cdb_persistent_reserve_in
 scsi_cdb_prefetch10
 scsi_cdb_prefetch16
 scsi_cdb_preventallow

lib/scsi-lowlevel.c

@@ -1611,6 +1611,37 @@ scsi_cdb_unmap(int anchor, int group, uint16_t xferlen)
 	return task;
 }
 
+/*
+ * PERSISTENT_RESEERVE_IN
+ */
+struct scsi_task *
+scsi_cdb_persistent_reserve_in(enum scsi_persistent_in_sa sa, uint16_t xferlen)
+{
+	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_PERSISTENT_RESERVE_IN;
+
+	task->cdb[1] |= sa & 0x1f;
+
+	scsi_set_uint16(&task->cdb[7], xferlen);
+
+	task->cdb_size = 10;
+	if (xferlen != 0) {
+		task->xfer_dir = SCSI_XFER_READ;
+	} else {
+		task->xfer_dir = SCSI_XFER_NONE;
+	}
+	task->expxferlen = xferlen;
+
+	return task;
+}
+
 /*
  * WRITE_SAME10
  */

lib/sync.c

@@ -798,6 +798,26 @@ iscsi_writesame16_sync(struct iscsi_context *iscsi, int lun,
 	return state.task;
 }
 
+struct scsi_task *
+iscsi_persistent_reserve_in_sync(struct iscsi_context *iscsi, int lun,
+				 int sa, uint16_t xferlen)
+{
+	struct iscsi_sync_state state;
+
+	memset(&state, 0, sizeof(state));
+
+	if (iscsi_persistent_reserve_in_task(iscsi, lun, sa, xferlen,
+				       scsi_sync_cb, &state) == NULL) {
+		iscsi_set_error(iscsi,
+				"Failed to send PERSISTENT_RESERVE_IN command");
+		return NULL;
+	}
+
+	event_loop(iscsi, &state);
+
+	return state.task;
+}
+
 struct scsi_task *
 iscsi_unmap_sync(struct iscsi_context *iscsi, int lun, int anchor, int group,
 		 struct unmap_list *list, int list_len)