- 根目录:
- drivers
- block
- drbd
- drbd_state.h
#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 R_MASK
#define peer_MASK R_MASK
#define disk_MASK D_MASK
#define pdsk_MASK D_MASK
#define conn_MASK C_MASK
#define susp_MASK 1
#define user_isp_MASK 1
#define aftr_isp_MASK 1
#define susp_nod_MASK 1
#define susp_fen_MASK 1
#define NS(T, S) \
({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \
({ union drbd_state val; val.i = 0; val.T = (S); val; })
#define NS2(T1, S1, T2, S2) \
({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
mask.T2 = T2##_MASK; mask; }), \
({ union drbd_state val; val.i = 0; val.T1 = (S1); \
val.T2 = (S2); val; })
#define NS3(T1, S1, T2, S2, T3, S3) \
({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \
({ union drbd_state val; val.i = 0; val.T1 = (S1); \
val.T2 = (S2); val.T3 = (S3); val; })
#define _NS(D, T, S) \
D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T = (S); __ns; })
#define _NS2(D, T1, S1, T2, S2) \
D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T1 = (S1); \
__ns.T2 = (S2); __ns; })
#define _NS3(D, T1, S1, T2, S2, T3, S3) \
D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T1 = (S1); \
__ns.T2 = (S2); __ns.T3 = (S3); __ns; })
enum chg_state_flags {
CS_HARD = 1 << 0,
CS_VERBOSE = 1 << 1,
CS_WAIT_COMPLETE = 1 << 2,
CS_SERIALIZE = 1 << 3,
CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE,
CS_LOCAL_ONLY = 1 << 4, /* Do not consider a device pair wide state change */
CS_DC_ROLE = 1 << 5, /* DC = display as connection state change */
CS_DC_PEER = 1 << 6,
CS_DC_CONN = 1 << 7,
CS_DC_DISK = 1 << 8,
CS_DC_PDSK = 1 << 9,
CS_DC_SUSP = 1 << 10,
CS_DC_MASK = CS_DC_ROLE + CS_DC_PEER + CS_DC_CONN + CS_DC_DISK + CS_DC_PDSK,
CS_IGN_OUTD_FAIL = 1 << 11,
};
/* 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). */
union drbd_dev_state {
struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
unsigned role:2 ; /* 3/4 primary/secondary/unknown */
unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
unsigned conn:5 ; /* 17/32 cstates */
unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
unsigned _unused:1 ;
unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
unsigned peer_isp:1 ;
unsigned user_isp:1 ;
unsigned _pad:11; /* 0 unused */
#elif defined(__BIG_ENDIAN_BITFIELD)
unsigned _pad:11;
unsigned user_isp:1 ;
unsigned peer_isp:1 ;
unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
unsigned _unused:1 ;
unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
unsigned conn:5 ; /* 17/32 cstates */
unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
unsigned role:2 ; /* 3/4 primary/secondary/unknown */
#else
# error "this endianess is not supported"
#endif
};
unsigned int i;
};
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, int);
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() - Reqest 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)
{
return _drbd_request_state(device, mask, val, CS_VERBOSE + CS_ORDERED);
}
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