1 #ifndef DRBD_STATE_H
2 #define DRBD_STATE_H
3
4 struct drbd_device;
5 struct drbd_connection;
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 = drbd_read_state(D); __ns.T = (S); __ns; })
52 #define _NS2(D, T1, S1, T2, S2) \
53 D, ({ union drbd_state __ns; __ns = drbd_read_state(D); __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 = drbd_read_state(D); __ns.T1 = (S1); \
57 __ns.T2 = (S2); __ns.T3 = (S3); __ns; })
58
59 enum chg_state_flags {
60 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,
71 CS_DC_SUSP = 1 << 10,
72 CS_DC_MASK = CS_DC_ROLE + CS_DC_PEER + CS_DC_CONN + CS_DC_DISK + CS_DC_PDSK,
73 CS_IGN_OUTD_FAIL = 1 << 11,
74 };
75
76 /* 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). */
79 union 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
110 extern enum drbd_state_rv drbd_change_state(struct drbd_device *device,
111 enum chg_state_flags f,
112 union drbd_state mask,
113 union drbd_state val);
114 extern void drbd_force_state(struct drbd_device *, union drbd_state,
115 union drbd_state);
116 extern enum drbd_state_rv _drbd_request_state(struct drbd_device *,
117 union drbd_state,
118 union drbd_state,
119 enum chg_state_flags);
120
121 extern enum drbd_state_rv
122 _drbd_request_state_holding_state_mutex(struct drbd_device *, union drbd_state,
123 union drbd_state, enum chg_state_flags);
124
125 extern enum drbd_state_rv _drbd_set_state(struct drbd_device *, union drbd_state,
126 enum chg_state_flags,
127 struct completion *done);
128 extern void print_st_err(struct drbd_device *, union drbd_state,
129 union drbd_state, int);
130
131 enum drbd_state_rv
132 _conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val,
133 enum chg_state_flags flags);
134
135 enum drbd_state_rv
136 conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val,
137 enum chg_state_flags flags);
138
139 extern void drbd_resume_al(struct drbd_device *device);
140 extern bool conn_all_vols_unconf(struct drbd_connection *connection);
141
142 /**
143 * drbd_request_state() - Request a state change
144 * @device: DRBD device.
145 * @mask: mask of state bits to change.
146 * @val: value of new state bits.
147 *
148 * This is the most graceful way of requesting a state change. It is verbose
149 * quite verbose in case the state change is not possible, and all those
150 * state changes are globally serialized.
151 */
drbd_request_state(struct drbd_device * device,union drbd_state mask,union drbd_state val)152 static inline int drbd_request_state(struct drbd_device *device,
153 union drbd_state mask,
154 union drbd_state val)
155 {
156 return _drbd_request_state(device, mask, val, CS_VERBOSE + CS_ORDERED);
157 }
158
159 enum drbd_role conn_highest_role(struct drbd_connection *connection);
160 enum drbd_role conn_highest_peer(struct drbd_connection *connection);
161 enum drbd_disk_state conn_highest_disk(struct drbd_connection *connection);
162 enum drbd_disk_state conn_lowest_disk(struct drbd_connection *connection);
163 enum drbd_disk_state conn_highest_pdsk(struct drbd_connection *connection);
164 enum drbd_conns conn_lowest_conn(struct drbd_connection *connection);
165
166 #endif
167