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b8907339 PR |
1 | #ifndef DRBD_STATE_H |
2 | #define DRBD_STATE_H | |
3 | ||
4 | struct drbd_conf; | |
5 | ||
6 | /** | |
7 | * DOC: DRBD State macros | |
8 | * | |
9 | * These macros are used to express state changes in easily readable form. | |
10 | * | |
11 | * The NS macros expand to a mask and a value, that can be bit ored onto the | |
12 | * current state as soon as the spinlock (req_lock) was taken. | |
13 | * | |
14 | * The _NS macros are used for state functions that get called with the | |
15 | * spinlock. These macros expand directly to the new state value. | |
16 | * | |
17 | * Besides the basic forms NS() and _NS() additional _?NS[23] are defined | |
18 | * to express state changes that affect more than one aspect of the state. | |
19 | * | |
20 | * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY) | |
21 | * Means that the network connection was established and that the peer | |
22 | * is in secondary role. | |
23 | */ | |
24 | #define role_MASK R_MASK | |
25 | #define peer_MASK R_MASK | |
26 | #define disk_MASK D_MASK | |
27 | #define pdsk_MASK D_MASK | |
28 | #define conn_MASK C_MASK | |
29 | #define susp_MASK 1 | |
30 | #define user_isp_MASK 1 | |
31 | #define aftr_isp_MASK 1 | |
32 | #define susp_nod_MASK 1 | |
33 | #define susp_fen_MASK 1 | |
34 | ||
35 | #define NS(T, S) \ | |
36 | ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \ | |
37 | ({ union drbd_state val; val.i = 0; val.T = (S); val; }) | |
38 | #define NS2(T1, S1, T2, S2) \ | |
39 | ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ | |
40 | mask.T2 = T2##_MASK; mask; }), \ | |
41 | ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ | |
42 | val.T2 = (S2); val; }) | |
43 | #define NS3(T1, S1, T2, S2, T3, S3) \ | |
44 | ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ | |
45 | mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \ | |
46 | ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ | |
47 | val.T2 = (S2); val.T3 = (S3); val; }) | |
48 | ||
49 | #define _NS(D, T, S) \ | |
50 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; }) | |
51 | #define _NS2(D, T1, S1, T2, S2) \ | |
52 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ | |
53 | __ns.T2 = (S2); __ns; }) | |
54 | #define _NS3(D, T1, S1, T2, S2, T3, S3) \ | |
55 | D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ | |
56 | __ns.T2 = (S2); __ns.T3 = (S3); __ns; }) | |
57 | ||
58 | enum chg_state_flags { | |
59 | CS_HARD = 1, | |
60 | CS_VERBOSE = 2, | |
61 | CS_WAIT_COMPLETE = 4, | |
62 | CS_SERIALIZE = 8, | |
63 | CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE, | |
64 | }; | |
65 | ||
66 | extern enum drbd_state_rv drbd_change_state(struct drbd_conf *mdev, | |
67 | enum chg_state_flags f, | |
68 | union drbd_state mask, | |
69 | union drbd_state val); | |
70 | extern void drbd_force_state(struct drbd_conf *, union drbd_state, | |
71 | union drbd_state); | |
72 | extern enum drbd_state_rv _drbd_request_state(struct drbd_conf *, | |
73 | union drbd_state, | |
74 | union drbd_state, | |
75 | enum chg_state_flags); | |
76 | extern enum drbd_state_rv __drbd_set_state(struct drbd_conf *, union drbd_state, | |
77 | enum chg_state_flags, | |
78 | struct completion *done); | |
79 | extern void print_st_err(struct drbd_conf *, union drbd_state, | |
80 | union drbd_state, int); | |
81 | ||
82 | extern void drbd_resume_al(struct drbd_conf *mdev); | |
83 | ||
84 | /** | |
85 | * drbd_request_state() - Reqest a state change | |
86 | * @mdev: DRBD device. | |
87 | * @mask: mask of state bits to change. | |
88 | * @val: value of new state bits. | |
89 | * | |
90 | * This is the most graceful way of requesting a state change. It is verbose | |
91 | * quite verbose in case the state change is not possible, and all those | |
92 | * state changes are globally serialized. | |
93 | */ | |
94 | static inline int drbd_request_state(struct drbd_conf *mdev, | |
95 | union drbd_state mask, | |
96 | union drbd_state val) | |
97 | { | |
98 | return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED); | |
99 | } | |
100 | ||
101 | #endif |