/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef DRBD_STATE_H #define DRBD_STATE_H struct drbd_device; struct drbd_connection; /** * DOC: DRBD State macros * * These macros are used to express state changes in easily readable form. * * The NS macros expand to a mask and a value, that can be bit ored onto the * current state as soon as the spinlock (req_lock) was taken. * * The _NS macros are used for state functions that get called with the * spinlock. These macros expand directly to the new state value. * * Besides the basic forms NS() and _NS() additional _?NS[23] are defined * to express state changes that affect more than one aspect of the state. * * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY) * Means that the network connection was established and that the peer * is in secondary role. */ #define role_MASK … #define peer_MASK … #define disk_MASK … #define pdsk_MASK … #define conn_MASK … #define susp_MASK … #define user_isp_MASK … #define aftr_isp_MASK … #define susp_nod_MASK … #define susp_fen_MASK … #define NS(T, S) … #define NS2(T1, S1, T2, S2) … #define NS3(T1, S1, T2, S2, T3, S3) … #define _NS(D, T, S) … #define _NS2(D, T1, S1, T2, S2) … #define _NS3(D, T1, S1, T2, S2, T3, S3) … enum chg_state_flags { … }; /* drbd_dev_state and drbd_state are different types. This is to stress the small difference. There is no suspended flag (.susp), and no suspended while fence handler runs flas (susp_fen). */ drbd_dev_state; extern enum drbd_state_rv drbd_change_state(struct drbd_device *device, enum chg_state_flags f, union drbd_state mask, union drbd_state val); extern void drbd_force_state(struct drbd_device *, union drbd_state, union drbd_state); extern enum drbd_state_rv _drbd_request_state(struct drbd_device *, union drbd_state, union drbd_state, enum chg_state_flags); extern enum drbd_state_rv _drbd_request_state_holding_state_mutex(struct drbd_device *, union drbd_state, union drbd_state, enum chg_state_flags); extern enum drbd_state_rv _drbd_set_state(struct drbd_device *, union drbd_state, enum chg_state_flags, struct completion *done); extern void print_st_err(struct drbd_device *, union drbd_state, union drbd_state, enum drbd_state_rv); enum drbd_state_rv _conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val, enum chg_state_flags flags); enum drbd_state_rv conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val, enum chg_state_flags flags); extern void drbd_resume_al(struct drbd_device *device); extern bool conn_all_vols_unconf(struct drbd_connection *connection); /** * drbd_request_state() - Request a state change * @device: DRBD device. * @mask: mask of state bits to change. * @val: value of new state bits. * * This is the most graceful way of requesting a state change. It is verbose * quite verbose in case the state change is not possible, and all those * state changes are globally serialized. */ static inline int drbd_request_state(struct drbd_device *device, union drbd_state mask, union drbd_state val) { … } /* for use in adm_detach() (drbd_adm_detach(), drbd_adm_down()) */ int drbd_request_detach_interruptible(struct drbd_device *device); enum drbd_role conn_highest_role(struct drbd_connection *connection); enum drbd_role conn_highest_peer(struct drbd_connection *connection); enum drbd_disk_state conn_highest_disk(struct drbd_connection *connection); enum drbd_disk_state conn_lowest_disk(struct drbd_connection *connection); enum drbd_disk_state conn_highest_pdsk(struct drbd_connection *connection); enum drbd_conns conn_lowest_conn(struct drbd_connection *connection); #endif
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