167 lines
6.0 KiB
C
167 lines
6.0 KiB
C
#ifndef DRBD_STATE_H
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#define DRBD_STATE_H
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struct drbd_device;
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struct drbd_connection;
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/**
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* DOC: DRBD State macros
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*
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* These macros are used to express state changes in easily readable form.
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*
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* The NS macros expand to a mask and a value, that can be bit ored onto the
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* current state as soon as the spinlock (req_lock) was taken.
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*
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* The _NS macros are used for state functions that get called with the
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* spinlock. These macros expand directly to the new state value.
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*
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* Besides the basic forms NS() and _NS() additional _?NS[23] are defined
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* to express state changes that affect more than one aspect of the state.
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*
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* E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY)
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* Means that the network connection was established and that the peer
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* is in secondary role.
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*/
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#define role_MASK R_MASK
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#define peer_MASK R_MASK
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#define disk_MASK D_MASK
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#define pdsk_MASK D_MASK
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#define conn_MASK C_MASK
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#define susp_MASK 1
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#define user_isp_MASK 1
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#define aftr_isp_MASK 1
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#define susp_nod_MASK 1
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#define susp_fen_MASK 1
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#define NS(T, S) \
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({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \
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({ union drbd_state val; val.i = 0; val.T = (S); val; })
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#define NS2(T1, S1, T2, S2) \
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({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
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mask.T2 = T2##_MASK; mask; }), \
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({ union drbd_state val; val.i = 0; val.T1 = (S1); \
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val.T2 = (S2); val; })
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#define NS3(T1, S1, T2, S2, T3, S3) \
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({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
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mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \
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({ union drbd_state val; val.i = 0; val.T1 = (S1); \
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val.T2 = (S2); val.T3 = (S3); val; })
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#define _NS(D, T, S) \
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D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T = (S); __ns; })
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#define _NS2(D, T1, S1, T2, S2) \
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D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T1 = (S1); \
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__ns.T2 = (S2); __ns; })
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#define _NS3(D, T1, S1, T2, S2, T3, S3) \
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D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T1 = (S1); \
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__ns.T2 = (S2); __ns.T3 = (S3); __ns; })
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enum chg_state_flags {
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CS_HARD = 1 << 0,
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CS_VERBOSE = 1 << 1,
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CS_WAIT_COMPLETE = 1 << 2,
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CS_SERIALIZE = 1 << 3,
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CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE,
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CS_LOCAL_ONLY = 1 << 4, /* Do not consider a device pair wide state change */
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CS_DC_ROLE = 1 << 5, /* DC = display as connection state change */
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CS_DC_PEER = 1 << 6,
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CS_DC_CONN = 1 << 7,
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CS_DC_DISK = 1 << 8,
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CS_DC_PDSK = 1 << 9,
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CS_DC_SUSP = 1 << 10,
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CS_DC_MASK = CS_DC_ROLE + CS_DC_PEER + CS_DC_CONN + CS_DC_DISK + CS_DC_PDSK,
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CS_IGN_OUTD_FAIL = 1 << 11,
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};
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/* drbd_dev_state and drbd_state are different types. This is to stress the
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small difference. There is no suspended flag (.susp), and no suspended
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while fence handler runs flas (susp_fen). */
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union drbd_dev_state {
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struct {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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unsigned role:2 ; /* 3/4 primary/secondary/unknown */
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unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
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unsigned conn:5 ; /* 17/32 cstates */
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unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned _unused:1 ;
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unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
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unsigned peer_isp:1 ;
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unsigned user_isp:1 ;
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unsigned _pad:11; /* 0 unused */
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#elif defined(__BIG_ENDIAN_BITFIELD)
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unsigned _pad:11;
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unsigned user_isp:1 ;
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unsigned peer_isp:1 ;
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unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
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unsigned _unused:1 ;
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unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned conn:5 ; /* 17/32 cstates */
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unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
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unsigned role:2 ; /* 3/4 primary/secondary/unknown */
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#else
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# error "this endianess is not supported"
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#endif
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};
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unsigned int i;
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};
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extern enum drbd_state_rv drbd_change_state(struct drbd_device *device,
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enum chg_state_flags f,
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union drbd_state mask,
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union drbd_state val);
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extern void drbd_force_state(struct drbd_device *, union drbd_state,
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union drbd_state);
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extern enum drbd_state_rv _drbd_request_state(struct drbd_device *,
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union drbd_state,
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union drbd_state,
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enum chg_state_flags);
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extern enum drbd_state_rv
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_drbd_request_state_holding_state_mutex(struct drbd_device *, union drbd_state,
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union drbd_state, enum chg_state_flags);
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extern enum drbd_state_rv __drbd_set_state(struct drbd_device *, union drbd_state,
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enum chg_state_flags,
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struct completion *done);
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extern void print_st_err(struct drbd_device *, union drbd_state,
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union drbd_state, int);
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enum drbd_state_rv
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_conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val,
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enum chg_state_flags flags);
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enum drbd_state_rv
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conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val,
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enum chg_state_flags flags);
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extern void drbd_resume_al(struct drbd_device *device);
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extern bool conn_all_vols_unconf(struct drbd_connection *connection);
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/**
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* drbd_request_state() - Reqest a state change
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* @device: DRBD device.
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* @mask: mask of state bits to change.
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* @val: value of new state bits.
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*
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* This is the most graceful way of requesting a state change. It is verbose
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* quite verbose in case the state change is not possible, and all those
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* state changes are globally serialized.
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*/
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static inline int drbd_request_state(struct drbd_device *device,
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union drbd_state mask,
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union drbd_state val)
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{
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return _drbd_request_state(device, mask, val, CS_VERBOSE + CS_ORDERED);
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}
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enum drbd_role conn_highest_role(struct drbd_connection *connection);
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enum drbd_role conn_highest_peer(struct drbd_connection *connection);
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enum drbd_disk_state conn_highest_disk(struct drbd_connection *connection);
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enum drbd_disk_state conn_lowest_disk(struct drbd_connection *connection);
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enum drbd_disk_state conn_highest_pdsk(struct drbd_connection *connection);
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enum drbd_conns conn_lowest_conn(struct drbd_connection *connection);
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#endif
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