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|
/*
* 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, 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,
/* currently only 256 volumes per group,
* but maybe we still change that */
__u32_field(1, GENLA_F_MANDATORY, ctx_volume)
__str_field(2, GENLA_F_MANDATORY, ctx_conn_name, 128)
)
GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
__str_field(1, GENLA_F_REQUIRED | GENLA_F_INVARIANT, backing_dev, 128)
__str_field(2, GENLA_F_REQUIRED | GENLA_F_INVARIANT, meta_dev, 128)
__u32_field(3, GENLA_F_REQUIRED | GENLA_F_INVARIANT, meta_dev_idx)
/* use the resize command to try and change the disk_size */
__u64_field(4, GENLA_F_MANDATORY | GENLA_F_INVARIANT, disk_size)
/* we could change the max_bio_bvecs,
* but it won't propagate through the stack */
__u32_field(5, GENLA_F_MANDATORY | GENLA_F_INVARIANT, max_bio_bvecs)
__u32_field(6, GENLA_F_MANDATORY, on_io_error)
__u32_field(7, GENLA_F_MANDATORY, fencing)
__u32_field(8, GENLA_F_MANDATORY, resync_rate)
__u32_field(9, GENLA_F_MANDATORY, resync_after)
__u32_field(10, GENLA_F_MANDATORY, al_extents)
__u32_field(11, GENLA_F_MANDATORY, c_plan_ahead)
__u32_field(12, GENLA_F_MANDATORY, c_delay_target)
__u32_field(13, GENLA_F_MANDATORY, c_fill_target)
__u32_field(14, GENLA_F_MANDATORY, c_max_rate)
__u32_field(15, GENLA_F_MANDATORY, c_min_rate)
__flg_field(16, GENLA_F_MANDATORY, no_disk_barrier)
__flg_field(17, GENLA_F_MANDATORY, no_disk_flush)
__flg_field(18, GENLA_F_MANDATORY, no_disk_drain)
__flg_field(19, GENLA_F_MANDATORY, no_md_flush)
)
GENL_struct(DRBD_NLA_RESOURCE_OPTS, 4, res_opts,
__str_field(1, GENLA_F_MANDATORY, cpu_mask, 32)
__u32_field(2, GENLA_F_MANDATORY, on_no_data)
)
GENL_struct(DRBD_NLA_NET_CONF, 5, net_conf,
__bin_field(1, GENLA_F_REQUIRED | GENLA_F_INVARIANT, my_addr, 128)
__bin_field(2, GENLA_F_REQUIRED | GENLA_F_INVARIANT, peer_addr, 128)
__str_field(3, GENLA_F_MANDATORY | GENLA_F_SENSITIVE,
shared_secret, SHARED_SECRET_MAX)
__str_field(4, GENLA_F_MANDATORY, cram_hmac_alg, SHARED_SECRET_MAX)
__str_field(5, GENLA_F_MANDATORY, integrity_alg, SHARED_SECRET_MAX)
__str_field(6, GENLA_F_MANDATORY, verify_alg, SHARED_SECRET_MAX)
__str_field(7, GENLA_F_MANDATORY, csums_alg, SHARED_SECRET_MAX)
__u32_field(8, GENLA_F_MANDATORY, wire_protocol)
__u32_field(9, GENLA_F_MANDATORY, try_connect_int)
__u32_field(10, GENLA_F_MANDATORY, timeout)
__u32_field(11, GENLA_F_MANDATORY, ping_int)
__u32_field(12, GENLA_F_MANDATORY, ping_timeo)
__u32_field(13, GENLA_F_MANDATORY, sndbuf_size)
__u32_field(14, GENLA_F_MANDATORY, rcvbuf_size)
__u32_field(15, GENLA_F_MANDATORY, ko_count)
__u32_field(16, GENLA_F_MANDATORY, max_buffers)
__u32_field(17, GENLA_F_MANDATORY, max_epoch_size)
__u32_field(18, GENLA_F_MANDATORY, unplug_watermark)
__u32_field(19, GENLA_F_MANDATORY, after_sb_0p)
__u32_field(20, GENLA_F_MANDATORY, after_sb_1p)
__u32_field(21, GENLA_F_MANDATORY, after_sb_2p)
__u32_field(22, GENLA_F_MANDATORY, rr_conflict)
__u32_field(23, GENLA_F_MANDATORY, on_congestion)
__u32_field(24, GENLA_F_MANDATORY, cong_fill)
__u32_field(25, GENLA_F_MANDATORY, cong_extents)
__flg_field(26, GENLA_F_MANDATORY, two_primaries)
__flg_field(27, GENLA_F_MANDATORY | GENLA_F_INVARIANT, want_lose)
__flg_field(28, GENLA_F_MANDATORY, no_cork)
__flg_field(29, GENLA_F_MANDATORY, always_asbp)
__flg_field(30, GENLA_F_MANDATORY | GENLA_F_INVARIANT, dry_run)
__flg_field(31, GENLA_F_MANDATORY, use_rle)
)
GENL_struct(DRBD_NLA_SET_ROLE_PARMS, 6, set_role_parms,
__flg_field(1, GENLA_F_MANDATORY, assume_uptodate)
)
GENL_struct(DRBD_NLA_RESIZE_PARMS, 7, resize_parms,
__u64_field(1, GENLA_F_MANDATORY, resize_size)
__flg_field(2, GENLA_F_MANDATORY, resize_force)
__flg_field(3, 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, GENLA_F_MANDATORY, sib_reason)
__u32_field(2, GENLA_F_REQUIRED, current_state)
__u64_field(3, GENLA_F_MANDATORY, capacity)
__u64_field(4, 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, GENLA_F_MANDATORY, prev_state)
__u32_field(6, GENLA_F_MANDATORY, new_state)
/* if we have a local disk: */
__bin_field(7, GENLA_F_MANDATORY, uuids, (UI_SIZE*sizeof(__u64)))
__u32_field(8, GENLA_F_MANDATORY, disk_flags)
__u64_field(9, GENLA_F_MANDATORY, bits_total)
__u64_field(10, GENLA_F_MANDATORY, bits_oos)
/* and in case resync or online verify is active */
__u64_field(11, GENLA_F_MANDATORY, bits_rs_total)
__u64_field(12, GENLA_F_MANDATORY, bits_rs_failed)
/* for pre and post notifications of helper execution */
__str_field(13, GENLA_F_MANDATORY, helper, 32)
__u32_field(14, GENLA_F_MANDATORY, helper_exit_code)
)
GENL_struct(DRBD_NLA_START_OV_PARMS, 9, start_ov_parms,
__u64_field(1, GENLA_F_MANDATORY, ov_start_sector)
)
GENL_struct(DRBD_NLA_NEW_C_UUID_PARMS, 10, new_c_uuid_parms,
__flg_field(1, GENLA_F_MANDATORY, clear_bm)
)
GENL_struct(DRBD_NLA_TIMEOUT_PARMS, 11, timeout_parms,
__u32_field(1, GENLA_F_REQUIRED, timeout_type)
)
GENL_struct(DRBD_NLA_DISCONNECT_PARMS, 12, disconnect_parms,
__flg_field(1, GENLA_F_MANDATORY, force_disconnect)
)
/*
* 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, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_STATE_INFO, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NET_CONF, GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_DISK_CONF, GENLA_F_MANDATORY)
GENL_tla_expected(DRBD_NLA_SYNCER_CONF, 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, GENLA_F_MANDATORY)
)
#if 0
/* TO BE DONE */
/* create or destroy resources, aka replication groups */
GENL_op(DRBD_ADM_CREATE_RESOURCE, 3, GENL_doit(drbd_adm_create_resource),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_DELETE_RESOURCE, 4, GENL_doit(drbd_adm_delete_resource),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
#endif
/* add DRBD minor devices as volumes to resources */
GENL_op(DRBD_ADM_ADD_MINOR, 5, GENL_doit(drbd_adm_add_minor),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_DEL_MINOR, 6, GENL_doit(drbd_adm_delete_minor),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
/* add or delete replication links to resources */
GENL_op(DRBD_ADM_ADD_LINK, 7, GENL_doit(drbd_adm_create_connection),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_DEL_LINK, 8, GENL_doit(drbd_adm_delete_connection),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_RESOURCE_OPTS, 9,
GENL_doit(drbd_adm_resource_opts),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_RESOURCE_OPTS, GENLA_F_MANDATORY)
)
GENL_op(
DRBD_ADM_CONNECT, 10,
GENL_doit(drbd_adm_connect),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NET_CONF, GENLA_F_REQUIRED)
)
GENL_op(
DRBD_ADM_CHG_NET_OPTS, 29,
GENL_doit(drbd_adm_net_opts),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NET_CONF, GENLA_F_REQUIRED)
)
GENL_op(DRBD_ADM_DISCONNECT, 11, GENL_doit(drbd_adm_disconnect),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_ATTACH, 12,
GENL_doit(drbd_adm_attach),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_DISK_CONF, GENLA_F_REQUIRED)
)
GENL_op(DRBD_ADM_CHG_DISK_OPTS, 28,
GENL_doit(drbd_adm_disk_opts),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_DISK_OPTS, GENLA_F_REQUIRED)
)
GENL_op(
DRBD_ADM_RESIZE, 13,
GENL_doit(drbd_adm_resize),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_RESIZE_PARMS, GENLA_F_MANDATORY)
)
GENL_op(
DRBD_ADM_PRIMARY, 14,
GENL_doit(drbd_adm_set_role),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_SET_ROLE_PARMS, GENLA_F_REQUIRED)
)
GENL_op(
DRBD_ADM_SECONDARY, 15,
GENL_doit(drbd_adm_set_role),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_SET_ROLE_PARMS, GENLA_F_REQUIRED)
)
GENL_op(
DRBD_ADM_NEW_C_UUID, 16,
GENL_doit(drbd_adm_new_c_uuid),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_NEW_C_UUID_PARMS, GENLA_F_MANDATORY)
)
GENL_op(
DRBD_ADM_START_OV, 17,
GENL_doit(drbd_adm_start_ov),
GENL_tla_expected(DRBD_NLA_START_OV_PARMS, GENLA_F_MANDATORY)
)
GENL_op(DRBD_ADM_DETACH, 18, GENL_doit(drbd_adm_detach),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_INVALIDATE, 19, GENL_doit(drbd_adm_invalidate),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_INVAL_PEER, 20, GENL_doit(drbd_adm_invalidate_peer),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_PAUSE_SYNC, 21, GENL_doit(drbd_adm_pause_sync),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_RESUME_SYNC, 22, GENL_doit(drbd_adm_resume_sync),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_SUSPEND_IO, 23, GENL_doit(drbd_adm_suspend_io),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_RESUME_IO, 24, GENL_doit(drbd_adm_resume_io),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_OUTDATE, 25, GENL_doit(drbd_adm_outdate),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_GET_TIMEOUT_TYPE, 26, GENL_doit(drbd_adm_get_timeout_type),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
GENL_op(DRBD_ADM_DOWN, 27, GENL_doit(drbd_adm_down),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, GENLA_F_REQUIRED))
|
