lustre/ptlrpc/layout.c establishes a mapping between the symbols (starting with RMF_) for message format structures and the actual structure definitions they represent. There are three entries in this mapping that do not appear in any message format. They are: RMF_OST_ID => ost_id RMF_STRING => string RMF_U32 => u32 There are also three duplicates: RMF_CAPA1 => capa and RMF_CAPA2 => capa RMF_FIEMAP_KEY => fiemap and RMF_FIEMAP_VAL => fiemap RMF_NIOBUF_REMOTE => niobuf_remote and RMF_RCS => niobuf_remote The mesage format symbols RMF_MGS_CONFIG_BODY and RMF_MGS_CONFIG_RES have the names, respecitvely, "mgs_config_read request" and "mgs_config_read reply" with two words (or a missing underscore). Similarly, RMF_U32 has the name "generic u32". Many of the message format symbols have a name that is the same as the symbol but in lower case and with out the leading "RMF_". On the other hand many of the symbols do not follow this pattern. Each declaration also has a field for the size to be allocated for the structure, and most use the "sizeof(struct the_struct)" construction to identify the size needed. That construct then gives a notion of what actual structure definition is going to give meaning to the bytes in that structure. The sizeof column presents that 'struct' name or a hint about the size of the message. A value of "-1" means, "the size is not going to be well defined in advance." Thus additional hits will need ot be included in the rest of the message. message format symbol name sizeof --------------------- ---------------- ------------------ RMF_ACL acl LUSTRE_POSIX_ACL_MAX_SIZE RMF_CAPA1 capa lustre_capa RMF_CAPA2 capa lustre_capa RMF_CLOSE_DATA data_version close_data RMF_CLUUID cluuid obd_uuid RMF_CONN conn lustre_handle RMF_CONNECT_DATA cdata obd_connect_data RMF_DLM_GL_DESC dlm_gl_desc ldlm_gl_desc RMF_DLM_LVB dlm_lvb -1 RMF_DLM_REP dlm_rep ldlm_reply RMF_DLM_REQ dlm_req ldlm_request RMF_EADATA eadata -1 RMF_EAVALS eavals -1 RMF_EAVALS_LENS eavals_lens __u32 RMF_FID fid lu_fid RMF_FIEMAP_KEY fiemap ll_fiemap_info_key RMF_FIEMAP_VAL fiemap -1 RMF_FLD_MDFLD fld_query_mdfld lu_seq_range RMF_FLD_OPC fld_query_opc __u32 RMF_GENERIC_DATA generic_data -1 RMF_GETINFO_KEY getinfo_key -1 RMF_GETINFO_VAL getinfo_val -1 RMF_GETINFO_VALLEN getinfo_vallen __u32 RMF_HSM_STATE_SET hsm_state_set hsm_state_set RMF_HSM_USER_STATE hsm_user_state hsm_user_state RMF_IDX_INFO idx_info idx_info RMF_LAYOUT_INTENT layout_intent layout_intent RMF_LDLM_INTENT ldlm_intent ldlm_intent RMF_LFSCK_REPLY lfsck_reply lfsck_reply RMF_LFSCK_REQUEST lfsck_request lfsck_request RMF_LLOGD_BODY llogd_body llogd_body RMF_LLOGD_CONN_BODY llogd_conn_body llogd_conn_body RMF_LLOG_LOG_HDR llog_log_hdr llog_log_hdr RMF_LOGCOOKIES logcookies llog_cookie RMF_MDS_HSM_ARCHIVE hsm_archive __u32 RMF_MDS_HSM_CURRENT_ACTION hsm_current_action hsm_current_action RMF_MDS_HSM_PROGRESS hsm_progress hsm_progress_kernel RMF_MDS_HSM_REQUEST hsm_request hsm_request RMF_MDS_HSM_USER_ITEM hsm_user_item hsm_user_item RMF_MDT_BODY mdt_body mdt_body RMF_MDT_EPOCH mdt_ioepoch mdt_ioepoch RMF_MDT_MD mdt_md MIN_MD_SIZE RMF_MGS_CONFIG_BODY mgs_config_read request mgs_config_body RMF_MGS_CONFIG_RES mgs_config_read reply mgs_config_res RMF_MGS_SEND_PARAM mgs_send_param mgs_send_param RMF_MGS_TARGET_INFO mgs_target_info mgs_target_info RMF_NAME name -1 RMF_NIOBUF_REMOTE niobuf_remote niobuf_remote RMF_OBD_ID obd_id __u64 RMF_OBD_IOOBJ obd_ioobj obd_ioobj RMF_OBD_QUOTACTL obd_quotactl obd_quotactl RMF_OBD_STATFS obd_statfs obd_statfs RMF_OST_BODY ost_body ost_body RMF_OST_ID ost_id ost_id RMF_OUT_UPDATE object_update -1 RMF_OUT_UPDATE_REPLY object_update_reply -1 RMF_PTLRPC_BODY ptlrpc_body (aka ptlrpc_body_v3) ptlrpc_body RMF_QUOTA_BODY quota_body quota_body RMF_RCS niobuf_remote __u32 RMF_REC_REINT rec_reint mdt_rec_reint RMF_SEQ_OPC seq_query_opc __u32 RMF_SEQ_RANGE seq_query_range lu_seq_range RMF_SETINFO_KEY setinfo_key -1 RMF_SETINFO_VAL setinfo_val -1 RMF_STRING string -1 RMF_SWAP_LAYOUTS swap_layouts mdc_swap_layouts RMF_SYMTGT symtgt -1 RMF_TGTUUID tgtuuid obd_uuid RMF_U32 generic u32 u32 __u32