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-rw-r--r--include/linux/drbd_genl.h378
1 files changed, 378 insertions, 0 deletions
diff --git a/include/linux/drbd_genl.h b/include/linux/drbd_genl.h
new file mode 100644
index 00000000000..d0d8fac8a6e
--- /dev/null
+++ b/include/linux/drbd_genl.h
@@ -0,0 +1,378 @@
+/*
+ * General overview:
+ * full generic netlink message:
+ * |nlmsghdr|genlmsghdr|<payload>
+ *
+ * payload:
+ * |optional fixed size family header|<sequence of netlink attributes>
+ *
+ * sequence of netlink attributes:
+ * I chose to have all "top level" attributes NLA_NESTED,
+ * corresponding to some real struct.
+ * So we have a sequence of |tla, len|<nested nla sequence>
+ *
+ * nested nla sequence:
+ * may be empty, or contain a sequence of netlink attributes
+ * representing the struct fields.
+ *
+ * The tag number of any field (regardless of containing struct)
+ * will be available as T_ ## field_name,
+ * so you cannot have the same field name in two differnt structs.
+ *
+ * The tag numbers themselves are per struct, though,
+ * so should always begin at 1 (not 0, that is the special "NLA_UNSPEC" type,
+ * which we won't use here).
+ * The tag numbers are used as index in the respective nla_policy array.
+ *
+ * GENL_struct(tag_name, tag_number, struct name, struct fields) - struct and policy
+ * genl_magic_struct.h
+ * generates the struct declaration,
+ * generates an entry in the tla enum,
+ * genl_magic_func.h
+ * generates an entry in the static tla policy
+ * with .type = NLA_NESTED
+ * generates the static <struct_name>_nl_policy definition,
+ * and static conversion functions
+ *
+ * genl_magic_func.h
+ *
+ * GENL_mc_group(group)
+ * genl_magic_struct.h
+ * does nothing
+ * genl_magic_func.h
+ * defines and registers the mcast group,
+ * and provides a send helper
+ *
+ * GENL_notification(op_name, op_num, mcast_group, tla list)
+ * These are notifications to userspace.
+ *
+ * genl_magic_struct.h
+ * generates an entry in the genl_ops enum,
+ * genl_magic_func.h
+ * does nothing
+ *
+ * mcast group: the name of the mcast group this notification should be
+ * expected on
+ * tla list: the list of expected top level attributes,
+ * for documentation and sanity checking.
+ *
+ * GENL_op(op_name, op_num, flags and handler, tla list) - "genl operations"
+ * These are requests from userspace.
+ *
+ * _op and _notification share the same "number space",
+ * op_nr will be assigned to "genlmsghdr->cmd"
+ *
+ * genl_magic_struct.h
+ * generates an entry in the genl_ops enum,
+ * genl_magic_func.h
+ * generates an entry in the static genl_ops array,
+ * and static register/unregister functions to
+ * genl_register_family_with_ops().
+ *
+ * flags and handler:
+ * GENL_op_init( .doit = x, .dumpit = y, .flags = something)
+ * GENL_doit(x) => .dumpit = NULL, .flags = GENL_ADMIN_PERM
+ * tla list: the list of expected top level attributes,
+ * for documentation and sanity checking.
+ */
+
+/*
+ * STRUCTS
+ */
+
+/* this is sent kernel -> userland on various error conditions, and contains
+ * informational textual info, which is supposedly human readable.
+ * The computer relevant return code is in the drbd_genlmsghdr.
+ */
+GENL_struct(DRBD_NLA_CFG_REPLY, 1, drbd_cfg_reply,
+ /* "arbitrary" size strings, nla_policy.len = 0 */
+ __str_field(1, DRBD_GENLA_F_MANDATORY, info_text, 0)
+)
+
+/* Configuration requests typically need a context to operate on.
+ * Possible keys are device minor (fits in the drbd_genlmsghdr),
+ * the replication link (aka connection) name,
+ * and/or the replication group (aka resource) name,
+ * and the volume id within the resource. */
+GENL_struct(DRBD_NLA_CFG_CONTEXT, 2, drbd_cfg_context,
+ __u32_field(1, DRBD_GENLA_F_MANDATORY, ctx_volume)
+ __str_field(2, DRBD_GENLA_F_MANDATORY, ctx_resource_name, 128)
+ __bin_field(3, DRBD_GENLA_F_MANDATORY, ctx_my_addr, 128)
+ __bin_field(4, DRBD_GENLA_F_MANDATORY, ctx_peer_addr, 128)
+)
+
+GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
+ __str_field(1, DRBD_F_REQUIRED | DRBD_F_INVARIANT, backing_dev, 128)
+ __str_field(2, DRBD_F_REQUIRED | DRBD_F_INVARIANT, meta_dev, 128)
+ __s32_field(3, DRBD_F_REQUIRED | DRBD_F_INVARIANT, meta_dev_idx)
+
+ /* use the resize command to try and change the disk_size */
+ __u64_field(4, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, disk_size)
+ /* we could change the max_bio_bvecs,
+ * but it won't propagate through the stack */
+ __u32_field(5, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, max_bio_bvecs)
+
+ __u32_field_def(6, DRBD_GENLA_F_MANDATORY, on_io_error, DRBD_ON_IO_ERROR_DEF)
+ __u32_field_def(7, DRBD_GENLA_F_MANDATORY, fencing, DRBD_FENCING_DEF)
+
+ __u32_field_def(8, DRBD_GENLA_F_MANDATORY, resync_rate, DRBD_RESYNC_RATE_DEF)
+ __s32_field_def(9, DRBD_GENLA_F_MANDATORY, resync_after, DRBD_MINOR_NUMBER_DEF)
+ __u32_field_def(10, DRBD_GENLA_F_MANDATORY, al_extents, DRBD_AL_EXTENTS_DEF)
+ __u32_field_def(11, DRBD_GENLA_F_MANDATORY, c_plan_ahead, DRBD_C_PLAN_AHEAD_DEF)
+ __u32_field_def(12, DRBD_GENLA_F_MANDATORY, c_delay_target, DRBD_C_DELAY_TARGET_DEF)
+ __u32_field_def(13, DRBD_GENLA_F_MANDATORY, c_fill_target, DRBD_C_FILL_TARGET_DEF)
+ __u32_field_def(14, DRBD_GENLA_F_MANDATORY, c_max_rate, DRBD_C_MAX_RATE_DEF)
+ __u32_field_def(15, DRBD_GENLA_F_MANDATORY, c_min_rate, DRBD_C_MIN_RATE_DEF)
+
+ __flg_field_def(16, DRBD_GENLA_F_MANDATORY, disk_barrier, DRBD_DISK_BARRIER_DEF)
+ __flg_field_def(17, DRBD_GENLA_F_MANDATORY, disk_flushes, DRBD_DISK_FLUSHES_DEF)
+ __flg_field_def(18, DRBD_GENLA_F_MANDATORY, disk_drain, DRBD_DISK_DRAIN_DEF)
+ __flg_field_def(19, DRBD_GENLA_F_MANDATORY, md_flushes, DRBD_MD_FLUSHES_DEF)
+ __u32_field_def(20, DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF)
+ __u32_field_def(21, 0 /* OPTIONAL */, read_balancing, DRBD_READ_BALANCING_DEF)
+ /* 9: __u32_field_def(22, DRBD_GENLA_F_MANDATORY, unplug_watermark, DRBD_UNPLUG_WATERMARK_DEF) */
+ __flg_field_def(23, 0 /* OPTIONAL */, al_updates, DRBD_AL_UPDATES_DEF)
+)
+
+GENL_struct(DRBD_NLA_RESOURCE_OPTS, 4, res_opts,
+ __str_field_def(1, DRBD_GENLA_F_MANDATORY, cpu_mask, 32)
+ __u32_field_def(2, DRBD_GENLA_F_MANDATORY, on_no_data, DRBD_ON_NO_DATA_DEF)
+)
+
+GENL_struct(DRBD_NLA_NET_CONF, 5, net_conf,
+ __str_field_def(1, DRBD_GENLA_F_MANDATORY | DRBD_F_SENSITIVE,
+ shared_secret, SHARED_SECRET_MAX)
+ __str_field_def(2, DRBD_GENLA_F_MANDATORY, cram_hmac_alg, SHARED_SECRET_MAX)
+ __str_field_def(3, DRBD_GENLA_F_MANDATORY, integrity_alg, SHARED_SECRET_MAX)
+ __str_field_def(4, DRBD_GENLA_F_MANDATORY, verify_alg, SHARED_SECRET_MAX)
+ __str_field_def(5, DRBD_GENLA_F_MANDATORY, csums_alg, SHARED_SECRET_MAX)
+ __u32_field_def(6, DRBD_GENLA_F_MANDATORY, wire_protocol, DRBD_PROTOCOL_DEF)
+ __u32_field_def(7, DRBD_GENLA_F_MANDATORY, connect_int, DRBD_CONNECT_INT_DEF)
+ __u32_field_def(8, DRBD_GENLA_F_MANDATORY, timeout, DRBD_TIMEOUT_DEF)
+ __u32_field_def(9, DRBD_GENLA_F_MANDATORY, ping_int, DRBD_PING_INT_DEF)
+ __u32_field_def(10, DRBD_GENLA_F_MANDATORY, ping_timeo, DRBD_PING_TIMEO_DEF)
+ __u32_field_def(11, DRBD_GENLA_F_MANDATORY, sndbuf_size, DRBD_SNDBUF_SIZE_DEF)
+ __u32_field_def(12, DRBD_GENLA_F_MANDATORY, rcvbuf_size, DRBD_RCVBUF_SIZE_DEF)
+ __u32_field_def(13, DRBD_GENLA_F_MANDATORY, ko_count, DRBD_KO_COUNT_DEF)
+ __u32_field_def(14, DRBD_GENLA_F_MANDATORY, max_buffers, DRBD_MAX_BUFFERS_DEF)
+ __u32_field_def(15, DRBD_GENLA_F_MANDATORY, max_epoch_size, DRBD_MAX_EPOCH_SIZE_DEF)
+ __u32_field_def(16, DRBD_GENLA_F_MANDATORY, unplug_watermark, DRBD_UNPLUG_WATERMARK_DEF)
+ __u32_field_def(17, DRBD_GENLA_F_MANDATORY, after_sb_0p, DRBD_AFTER_SB_0P_DEF)
+ __u32_field_def(18, DRBD_GENLA_F_MANDATORY, after_sb_1p, DRBD_AFTER_SB_1P_DEF)
+ __u32_field_def(19, DRBD_GENLA_F_MANDATORY, after_sb_2p, DRBD_AFTER_SB_2P_DEF)
+ __u32_field_def(20, DRBD_GENLA_F_MANDATORY, rr_conflict, DRBD_RR_CONFLICT_DEF)
+ __u32_field_def(21, DRBD_GENLA_F_MANDATORY, on_congestion, DRBD_ON_CONGESTION_DEF)
+ __u32_field_def(22, DRBD_GENLA_F_MANDATORY, cong_fill, DRBD_CONG_FILL_DEF)
+ __u32_field_def(23, DRBD_GENLA_F_MANDATORY, cong_extents, DRBD_CONG_EXTENTS_DEF)
+ __flg_field_def(24, DRBD_GENLA_F_MANDATORY, two_primaries, DRBD_ALLOW_TWO_PRIMARIES_DEF)
+ __flg_field(25, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, discard_my_data)
+ __flg_field_def(26, DRBD_GENLA_F_MANDATORY, tcp_cork, DRBD_TCP_CORK_DEF)
+ __flg_field_def(27, DRBD_GENLA_F_MANDATORY, always_asbp, DRBD_ALWAYS_ASBP_DEF)
+ __flg_field(28, DRBD_GENLA_F_MANDATORY | DRBD_F_INVARIANT, tentative)
+ __flg_field_def(29, DRBD_GENLA_F_MANDATORY, use_rle, DRBD_USE_RLE_DEF)
+ /* 9: __u32_field_def(30, DRBD_GENLA_F_MANDATORY, fencing_policy, DRBD_FENCING_DEF) */
+)
+
+GENL_struct(DRBD_NLA_SET_ROLE_PARMS, 6, set_role_parms,
+ __flg_field(1, DRBD_GENLA_F_MANDATORY, assume_uptodate)
+)
+
+GENL_struct(DRBD_NLA_RESIZE_PARMS, 7, resize_parms,
+ __u64_field(1, DRBD_GENLA_F_MANDATORY, resize_size)
+ __flg_field(2, DRBD_GENLA_F_MANDATORY, resize_force)
+ __flg_field(3, DRBD_GENLA_F_MANDATORY, no_resync)
+)
+
+GENL_struct(DRBD_NLA_STATE_INFO, 8, state_info,
+ /* the reason of the broadcast,
+ * if this is an event triggered broadcast. */
+ __u32_field(1, DRBD_GENLA_F_MANDATORY, sib_reason)
+ __u32_field(2, DRBD_F_REQUIRED, current_state)
+ __u64_field(3, DRBD_GENLA_F_MANDATORY, capacity)
+ __u64_field(4, DRBD_GENLA_F_MANDATORY, ed_uuid)
+
+ /* These are for broadcast from after state change work.
+ * prev_state and new_state are from the moment the state change took
+ * place, new_state is not neccessarily the same as current_state,
+ * there may have been more state changes since. Which will be
+ * broadcasted soon, in their respective after state change work. */
+ __u32_field(5, DRBD_GENLA_F_MANDATORY, prev_state)
+ __u32_field(6, DRBD_GENLA_F_MANDATORY, new_state)
+
+ /* if we have a local disk: */
+ __bin_field(7, DRBD_GENLA_F_MANDATORY, uuids, (UI_SIZE*sizeof(__u64)))
+ __u32_field(8, DRBD_GENLA_F_MANDATORY, disk_flags)
+ __u64_field(9, DRBD_GENLA_F_MANDATORY, bits_total)
+ __u64_field(10, DRBD_GENLA_F_MANDATORY, bits_oos)
+ /* and in case resync or online verify is active */
+ __u64_field(11, DRBD_GENLA_F_MANDATORY, bits_rs_total)
+ __u64_field(12, DRBD_GENLA_F_MANDATORY, bits_rs_failed)
+
+ /* for pre and post notifications of helper execution */
+ __str_field(13, DRBD_GENLA_F_MANDATORY, helper, 32)
+ __u32_field(14, DRBD_GENLA_F_MANDATORY, helper_exit_code)
+
+ __u64_field(15, 0, send_cnt)
+ __u64_field(16, 0, recv_cnt)
+ __u64_field(17, 0, read_cnt)
+ __u64_field(18, 0, writ_cnt)
+ __u64_field(19, 0, al_writ_cnt)
+ __u64_field(20, 0, bm_writ_cnt)
+ __u32_field(21, 0, ap_bio_cnt)
+ __u32_field(22, 0, ap_pending_cnt)
+ __u32_field(23, 0, rs_pending_cnt)
+)
+
+GENL_struct(DRBD_NLA_START_OV_PARMS, 9, start_ov_parms,
+ __u64_field(1, DRBD_GENLA_F_MANDATORY, ov_start_sector)
+ __u64_field(2, DRBD_GENLA_F_MANDATORY, ov_stop_sector)
+)
+
+GENL_struct(DRBD_NLA_NEW_C_UUID_PARMS, 10, new_c_uuid_parms,
+ __flg_field(1, DRBD_GENLA_F_MANDATORY, clear_bm)
+)
+
+GENL_struct(DRBD_NLA_TIMEOUT_PARMS, 11, timeout_parms,
+ __u32_field(1, DRBD_F_REQUIRED, timeout_type)
+)
+
+GENL_struct(DRBD_NLA_DISCONNECT_PARMS, 12, disconnect_parms,
+ __flg_field(1, DRBD_GENLA_F_MANDATORY, force_disconnect)
+)
+
+GENL_struct(DRBD_NLA_DETACH_PARMS, 13, detach_parms,
+ __flg_field(1, DRBD_GENLA_F_MANDATORY, force_detach)
+)
+
+/*
+ * Notifications and commands (genlmsghdr->cmd)
+ */
+GENL_mc_group(events)
+
+ /* kernel -> userspace announcement of changes */
+GENL_notification(
+ DRBD_EVENT, 1, events,
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_STATE_INFO, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_NET_CONF, DRBD_GENLA_F_MANDATORY)
+ GENL_tla_expected(DRBD_NLA_DISK_CONF, DRBD_GENLA_F_MANDATORY)
+ GENL_tla_expected(DRBD_NLA_SYNCER_CONF, DRBD_GENLA_F_MANDATORY)
+)
+
+ /* query kernel for specific or all info */
+GENL_op(
+ DRBD_ADM_GET_STATUS, 2,
+ GENL_op_init(
+ .doit = drbd_adm_get_status,
+ .dumpit = drbd_adm_get_status_all,
+ /* anyone may ask for the status,
+ * it is broadcasted anyways */
+ ),
+ /* To select the object .doit.
+ * Or a subset of objects in .dumpit. */
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_GENLA_F_MANDATORY)
+)
+
+ /* add DRBD minor devices as volumes to resources */
+GENL_op(DRBD_ADM_NEW_MINOR, 5, GENL_doit(drbd_adm_add_minor),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_DEL_MINOR, 6, GENL_doit(drbd_adm_delete_minor),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+
+ /* add or delete resources */
+GENL_op(DRBD_ADM_NEW_RESOURCE, 7, GENL_doit(drbd_adm_new_resource),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_DEL_RESOURCE, 8, GENL_doit(drbd_adm_del_resource),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+
+GENL_op(DRBD_ADM_RESOURCE_OPTS, 9,
+ GENL_doit(drbd_adm_resource_opts),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_RESOURCE_OPTS, DRBD_GENLA_F_MANDATORY)
+)
+
+GENL_op(
+ DRBD_ADM_CONNECT, 10,
+ GENL_doit(drbd_adm_connect),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_NET_CONF, DRBD_F_REQUIRED)
+)
+
+GENL_op(
+ DRBD_ADM_CHG_NET_OPTS, 29,
+ GENL_doit(drbd_adm_net_opts),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_NET_CONF, DRBD_F_REQUIRED)
+)
+
+GENL_op(DRBD_ADM_DISCONNECT, 11, GENL_doit(drbd_adm_disconnect),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+
+GENL_op(DRBD_ADM_ATTACH, 12,
+ GENL_doit(drbd_adm_attach),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_DISK_CONF, DRBD_F_REQUIRED)
+)
+
+GENL_op(DRBD_ADM_CHG_DISK_OPTS, 28,
+ GENL_doit(drbd_adm_disk_opts),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_DISK_OPTS, DRBD_F_REQUIRED)
+)
+
+GENL_op(
+ DRBD_ADM_RESIZE, 13,
+ GENL_doit(drbd_adm_resize),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_RESIZE_PARMS, DRBD_GENLA_F_MANDATORY)
+)
+
+GENL_op(
+ DRBD_ADM_PRIMARY, 14,
+ GENL_doit(drbd_adm_set_role),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_SET_ROLE_PARMS, DRBD_F_REQUIRED)
+)
+
+GENL_op(
+ DRBD_ADM_SECONDARY, 15,
+ GENL_doit(drbd_adm_set_role),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_SET_ROLE_PARMS, DRBD_F_REQUIRED)
+)
+
+GENL_op(
+ DRBD_ADM_NEW_C_UUID, 16,
+ GENL_doit(drbd_adm_new_c_uuid),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_NEW_C_UUID_PARMS, DRBD_GENLA_F_MANDATORY)
+)
+
+GENL_op(
+ DRBD_ADM_START_OV, 17,
+ GENL_doit(drbd_adm_start_ov),
+ GENL_tla_expected(DRBD_NLA_START_OV_PARMS, DRBD_GENLA_F_MANDATORY)
+)
+
+GENL_op(DRBD_ADM_DETACH, 18, GENL_doit(drbd_adm_detach),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
+ GENL_tla_expected(DRBD_NLA_DETACH_PARMS, DRBD_GENLA_F_MANDATORY))
+
+GENL_op(DRBD_ADM_INVALIDATE, 19, GENL_doit(drbd_adm_invalidate),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_INVAL_PEER, 20, GENL_doit(drbd_adm_invalidate_peer),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_PAUSE_SYNC, 21, GENL_doit(drbd_adm_pause_sync),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_RESUME_SYNC, 22, GENL_doit(drbd_adm_resume_sync),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_SUSPEND_IO, 23, GENL_doit(drbd_adm_suspend_io),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_RESUME_IO, 24, GENL_doit(drbd_adm_resume_io),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_OUTDATE, 25, GENL_doit(drbd_adm_outdate),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_GET_TIMEOUT_TYPE, 26, GENL_doit(drbd_adm_get_timeout_type),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
+GENL_op(DRBD_ADM_DOWN, 27, GENL_doit(drbd_adm_down),
+ GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))