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b8907339 PR |
1 | #ifndef DRBD_STATE_H |
2 | #define DRBD_STATE_H | |
3 | ||
4 | struct drbd_conf; | |
bbeb641c | 5 | struct drbd_tconn; |
b8907339 PR |
6 | |
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) \ | |
51 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; }) | |
52 | #define _NS2(D, T1, S1, T2, S2) \ | |
53 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ | |
54 | __ns.T2 = (S2); __ns; }) | |
55 | #define _NS3(D, T1, S1, T2, S2, T3, S3) \ | |
56 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ | |
57 | __ns.T2 = (S2); __ns.T3 = (S3); __ns; }) | |
58 | ||
59 | enum chg_state_flags { | |
60 | CS_HARD = 1, | |
61 | CS_VERBOSE = 2, | |
62 | CS_WAIT_COMPLETE = 4, | |
63 | CS_SERIALIZE = 8, | |
64 | CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE, | |
bbeb641c | 65 | CS_NO_CSTATE_CHG = 16, /* Do not display changes in cstate. Internal to drbd_state.c */ |
047cd4a6 | 66 | CS_LOCAL_ONLY = 32, /* Do not consider a device pair wide state change */ |
b8907339 PR |
67 | }; |
68 | ||
69 | extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev, | |
70 | enum chg_state_flags f, | |
71 | union drbd_state mask, | |
72 | union drbd_state val); | |
73 | extern void drbd_force_state(struct drbd_conf *, union drbd_state, | |
74 | union drbd_state); | |
75 | extern enum drbd_state_rv _drbd_request_state(struct drbd_conf *, | |
76 | union drbd_state, | |
77 | union drbd_state, | |
78 | enum chg_state_flags); | |
79 | extern enum drbd_state_rv __drbd_set_state(struct drbd_conf *, union drbd_state, | |
80 | enum chg_state_flags, | |
81 | struct completion *done); | |
82 | extern void print_st_err(struct drbd_conf *, union drbd_state, | |
83 | union drbd_state, int); | |
84 | ||
bbeb641c PR |
85 | enum drbd_state_rv |
86 | _conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, | |
87 | enum chg_state_flags flags); | |
88 | ||
89 | enum drbd_state_rv | |
90 | conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val, | |
91 | enum chg_state_flags flags); | |
92 | ||
b8907339 | 93 | extern void drbd_resume_al(struct drbd_conf *mdev); |
d0456c72 | 94 | extern bool conn_all_vols_unconf(struct drbd_tconn *tconn); |
b8907339 PR |
95 | |
96 | /** | |
97 | * drbd_request_state() - Reqest a state change | |
98 | * @mdev: DRBD device. | |
99 | * @mask: mask of state bits to change. | |
100 | * @val: value of new state bits. | |
101 | * | |
102 | * This is the most graceful way of requesting a state change. It is verbose | |
103 | * quite verbose in case the state change is not possible, and all those | |
104 | * state changes are globally serialized. | |
105 | */ | |
106 | static inline int drbd_request_state(struct drbd_conf *mdev, | |
107 | union drbd_state mask, | |
108 | union drbd_state val) | |
109 | { | |
110 | return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED); | |
111 | } | |
112 | ||
113 | #endif |