some code

src/inc/taoserror.h

@@ -181,6 +181,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_DND_MSG_NOT_PROCESSED,        0, 0x0400, "Message no
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_OUT_OF_MEMORY,            0, 0x0401, "Dnode out of memory")
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_NO_WRITE_ACCESS,          0, 0x0402, "No permission for disk files in dnode")
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_INVALID_MSG_LEN,          0, 0x0403, "Invalid message length")
+TAOS_DEFINE_ERROR(TSDB_CODE_DND_INVALID_DISK_TIER,        0, 0x0404, "Invalid disk tier setting")
+TAOS_DEFINE_ERROR(TSDB_CODE_DND_TOO_MANY_DISKS,           0, 0x0405, "Too many disks in one tier")
+TAOS_DEFINE_ERROR(TSDB_CODE_DND_DISK_ALREADY_EXISTS,      0, 0x0406, "Disk already exists")
 
 // vnode 
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_ACTION_IN_PROGRESS,       0, 0x0500, "Action in progress")