]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/block/drbd/drbd_state.h
5 struct drbd_connection
;
8 * DOC: DRBD State macros
10 * These macros are used to express state changes in easily readable form.
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.
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.
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.
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.
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
31 #define user_isp_MASK 1
32 #define aftr_isp_MASK 1
33 #define susp_nod_MASK 1
34 #define susp_fen_MASK 1
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; })
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; })
59 enum chg_state_flags
{
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 */
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,
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
{
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 */
88 unsigned aftr_isp
:1 ; /* isp .. imposed sync pause */
91 unsigned _pad
:11; /* 0 unused */
92 #elif defined(__BIG_ENDIAN_BITFIELD)
96 unsigned aftr_isp
:1 ; /* isp .. imposed sync pause */
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 */
104 # error "this endianess is not supported"
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
,
116 extern enum drbd_state_rv
_drbd_request_state(struct drbd_device
*,
119 enum chg_state_flags
);
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
);
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);
132 _conn_request_state(struct drbd_connection
*connection
, union drbd_state mask
, union drbd_state val
,
133 enum chg_state_flags flags
);
136 conn_request_state(struct drbd_connection
*connection
, union drbd_state mask
, union drbd_state val
,
137 enum chg_state_flags flags
);
139 extern void drbd_resume_al(struct drbd_device
*device
);
140 extern bool conn_all_vols_unconf(struct drbd_connection
*connection
);
143 * drbd_request_state() - Reqest a state change
144 * @device: DRBD device.
145 * @mask: mask of state bits to change.
146 * @val: value of new state bits.
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.
152 static inline int drbd_request_state(struct drbd_device
*device
,
153 union drbd_state mask
,
154 union drbd_state val
)
156 return _drbd_request_state(device
, mask
, val
, CS_VERBOSE
+ CS_ORDERED
);
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
);