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Philipp Reisnerb8907332011-01-27 14:07:51 +01001#ifndef DRBD_STATE_H
2#define DRBD_STATE_H
3
4struct drbd_conf;
Philipp Reisnerbbeb6412011-02-10 13:45:46 +01005struct drbd_tconn;
Philipp Reisnerb8907332011-01-27 14:07:51 +01006
7/**
8 * DOC: DRBD State macros
9 *
10 * These macros are used to express state changes in easily readable form.
11 *
12 * The NS macros expand to a mask and a value, that can be bit ored onto the
13 * current state as soon as the spinlock (req_lock) was taken.
14 *
15 * The _NS macros are used for state functions that get called with the
16 * spinlock. These macros expand directly to the new state value.
17 *
18 * Besides the basic forms NS() and _NS() additional _?NS[23] are defined
19 * to express state changes that affect more than one aspect of the state.
20 *
21 * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY)
22 * Means that the network connection was established and that the peer
23 * is in secondary role.
24 */
25#define role_MASK R_MASK
26#define peer_MASK R_MASK
27#define disk_MASK D_MASK
28#define pdsk_MASK D_MASK
29#define conn_MASK C_MASK
30#define susp_MASK 1
31#define user_isp_MASK 1
32#define aftr_isp_MASK 1
33#define susp_nod_MASK 1
34#define susp_fen_MASK 1
35
36#define NS(T, S) \
37 ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \
38 ({ union drbd_state val; val.i = 0; val.T = (S); val; })
39#define NS2(T1, S1, T2, S2) \
40 ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
41 mask.T2 = T2##_MASK; mask; }), \
42 ({ union drbd_state val; val.i = 0; val.T1 = (S1); \
43 val.T2 = (S2); val; })
44#define NS3(T1, S1, T2, S2, T3, S3) \
45 ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
46 mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \
47 ({ union drbd_state val; val.i = 0; val.T1 = (S1); \
48 val.T2 = (S2); val.T3 = (S3); val; })
49
50#define _NS(D, T, S) \
Philipp Reisner78bae592011-03-28 15:40:12 +020051 D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T = (S); __ns; })
Philipp Reisnerb8907332011-01-27 14:07:51 +010052#define _NS2(D, T1, S1, T2, S2) \
Philipp Reisner78bae592011-03-28 15:40:12 +020053 D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T1 = (S1); \
Philipp Reisnerb8907332011-01-27 14:07:51 +010054 __ns.T2 = (S2); __ns; })
55#define _NS3(D, T1, S1, T2, S2, T3, S3) \
Philipp Reisner78bae592011-03-28 15:40:12 +020056 D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __ns.T1 = (S1); \
Philipp Reisnerb8907332011-01-27 14:07:51 +010057 __ns.T2 = (S2); __ns.T3 = (S3); __ns; })
58
59enum chg_state_flags {
Philipp Reisner435693e2011-03-25 15:11:30 +010060 CS_HARD = 1 << 0,
61 CS_VERBOSE = 1 << 1,
62 CS_WAIT_COMPLETE = 1 << 2,
63 CS_SERIALIZE = 1 << 3,
64 CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE,
65 CS_LOCAL_ONLY = 1 << 4, /* Do not consider a device pair wide state change */
66 CS_DC_ROLE = 1 << 5, /* DC = display as connection state change */
67 CS_DC_PEER = 1 << 6,
68 CS_DC_CONN = 1 << 7,
69 CS_DC_DISK = 1 << 8,
70 CS_DC_PDSK = 1 << 9,
Philipp Reisner706cb242011-03-29 15:20:27 +020071 CS_DC_SUSP = 1 << 10,
Philipp Reisner435693e2011-03-25 15:11:30 +010072 CS_DC_MASK = CS_DC_ROLE + CS_DC_PEER + CS_DC_CONN + CS_DC_DISK + CS_DC_PDSK,
Philipp Reisner706cb242011-03-29 15:20:27 +020073 CS_IGN_OUTD_FAIL = 1 << 11,
Philipp Reisnerb8907332011-01-27 14:07:51 +010074};
75
Philipp Reisnerda9fbc22011-03-29 10:52:01 +020076/* drbd_dev_state and drbd_state are different types. This is to stress the
77 small difference. There is no suspended flag (.susp), and no suspended
78 while fence handler runs flas (susp_fen). */
79union drbd_dev_state {
80 struct {
81#if defined(__LITTLE_ENDIAN_BITFIELD)
82 unsigned role:2 ; /* 3/4 primary/secondary/unknown */
83 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
84 unsigned conn:5 ; /* 17/32 cstates */
85 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
86 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
87 unsigned _unused:1 ;
88 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
89 unsigned peer_isp:1 ;
90 unsigned user_isp:1 ;
91 unsigned _pad:11; /* 0 unused */
92#elif defined(__BIG_ENDIAN_BITFIELD)
93 unsigned _pad:11;
94 unsigned user_isp:1 ;
95 unsigned peer_isp:1 ;
96 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
97 unsigned _unused:1 ;
98 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
99 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
100 unsigned conn:5 ; /* 17/32 cstates */
101 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
102 unsigned role:2 ; /* 3/4 primary/secondary/unknown */
103#else
104# error "this endianess is not supported"
105#endif
106 };
107 unsigned int i;
108};
109
Philipp Reisnerb8907332011-01-27 14:07:51 +0100110extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev,
111 enum chg_state_flags f,
112 union drbd_state mask,
113 union drbd_state val);
114extern void drbd_force_state(struct drbd_conf *, union drbd_state,
115 union drbd_state);
116extern enum drbd_state_rv _drbd_request_state(struct drbd_conf *,
117 union drbd_state,
118 union drbd_state,
119 enum chg_state_flags);
120extern enum drbd_state_rv __drbd_set_state(struct drbd_conf *, union drbd_state,
121 enum chg_state_flags,
122 struct completion *done);
123extern void print_st_err(struct drbd_conf *, union drbd_state,
124 union drbd_state, int);
125
Philipp Reisnerbbeb6412011-02-10 13:45:46 +0100126enum drbd_state_rv
127_conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
128 enum chg_state_flags flags);
129
130enum drbd_state_rv
131conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
132 enum chg_state_flags flags);
133
Philipp Reisnerb8907332011-01-27 14:07:51 +0100134extern void drbd_resume_al(struct drbd_conf *mdev);
Lars Ellenbergd0456c72011-03-10 23:28:13 +0100135extern bool conn_all_vols_unconf(struct drbd_tconn *tconn);
Philipp Reisnerb8907332011-01-27 14:07:51 +0100136
137/**
138 * drbd_request_state() - Reqest a state change
139 * @mdev: DRBD device.
140 * @mask: mask of state bits to change.
141 * @val: value of new state bits.
142 *
143 * This is the most graceful way of requesting a state change. It is verbose
144 * quite verbose in case the state change is not possible, and all those
145 * state changes are globally serialized.
146 */
147static inline int drbd_request_state(struct drbd_conf *mdev,
148 union drbd_state mask,
149 union drbd_state val)
150{
151 return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED);
152}
153
Philipp Reisnercb703452011-03-24 11:03:07 +0100154enum drbd_role conn_highest_role(struct drbd_tconn *tconn);
155enum drbd_role conn_highest_peer(struct drbd_tconn *tconn);
156enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn);
Philipp Reisner46692652011-03-29 18:15:49 +0200157enum drbd_disk_state conn_lowest_disk(struct drbd_tconn *tconn);
Philipp Reisnercb703452011-03-24 11:03:07 +0100158enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn);
Philipp Reisner19f83c72011-03-29 14:21:03 +0200159enum drbd_conns conn_lowest_conn(struct drbd_tconn *tconn);
Philipp Reisnercb703452011-03-24 11:03:07 +0100160
Philipp Reisnerb8907332011-01-27 14:07:51 +0100161#endif