175 lines
6.4 KiB
C
175 lines
6.4 KiB
C
|
/* 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 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,
|
||
|
|
|
||
|
|
/* Make sure no meta data IO is in flight, by calling
|
||
|
|
* drbd_md_get_buffer(). Used for graceful detach. */
|
||
|
|
CS_INHIBIT_MD_IO = 1 << 12,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* 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, 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)
|
||
|
|
{
|
||
|
|
return _drbd_request_state(device, mask, val, CS_VERBOSE + CS_ORDERED);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 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
|