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 extern enum drbd_state_rv __drbd_set_state(struct drbd_device *, union drbd_state, 121 enum chg_state_flags, 122 struct completion *done); 123 extern void print_st_err(struct drbd_device *, union drbd_state, 124 union drbd_state, int); 125 126 enum drbd_state_rv 127 _conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val, 128 enum chg_state_flags flags); 129 130 enum drbd_state_rv 131 conn_request_state(struct drbd_connection *connection, union drbd_state mask, union drbd_state val, 132 enum chg_state_flags flags); 133 134 extern void drbd_resume_al(struct drbd_device *device); 135 extern bool conn_all_vols_unconf(struct drbd_connection *connection); 136 137 /** 138 * drbd_request_state() - Reqest a state change 139 * @device: 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 */ 147 static inline int drbd_request_state(struct drbd_device *device, 148 union drbd_state mask, 149 union drbd_state val) 150 { 151 return _drbd_request_state(device, mask, val, CS_VERBOSE + CS_ORDERED); 152 } 153 154 enum drbd_role conn_highest_role(struct drbd_connection *connection); 155 enum drbd_role conn_highest_peer(struct drbd_connection *connection); 156 enum drbd_disk_state conn_highest_disk(struct drbd_connection *connection); 157 enum drbd_disk_state conn_lowest_disk(struct drbd_connection *connection); 158 enum drbd_disk_state conn_highest_pdsk(struct drbd_connection *connection); 159 enum drbd_conns conn_lowest_conn(struct drbd_connection *connection); 160 161 #endif 162