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1 | /* |
2 | drbd.h |
3 | Kernel module for 2.6.x Kernels |
4 | |
5 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
6 | |
7 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
8 | Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
9 | Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
10 | |
11 | drbd is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by |
13 | the Free Software Foundation; either version 2, or (at your option) |
14 | any later version. |
15 | |
16 | drbd is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
19 | GNU General Public License for more details. |
20 | |
21 | You should have received a copy of the GNU General Public License |
22 | along with drbd; see the file COPYING. If not, write to |
23 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
24 | |
25 | */ |
26 | #ifndef DRBD_H |
27 | #define DRBD_H |
28 | #include <linux/connector.h> |
29 | #include <asm/types.h> |
30 | |
31 | #ifdef __KERNEL__ |
32 | #include <linux/types.h> |
33 | #include <asm/byteorder.h> |
34 | #else |
35 | #include <sys/types.h> |
36 | #include <sys/wait.h> |
37 | #include <limits.h> |
38 | |
39 | /* Altough the Linux source code makes a difference between |
40 | generic endianness and the bitfields' endianness, there is no |
41 | architecture as of Linux-2.6.24-rc4 where the bitfileds' endianness |
42 | does not match the generic endianness. */ |
43 | |
44 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
45 | #define __LITTLE_ENDIAN_BITFIELD |
46 | #elif __BYTE_ORDER == __BIG_ENDIAN |
47 | #define __BIG_ENDIAN_BITFIELD |
48 | #else |
49 | # error "sorry, weird endianness on this box" |
50 | #endif |
51 | |
52 | #endif |
53 | |
54 | |
55 | extern const char *drbd_buildtag(void); |
56 | #define REL_VERSION "8.3.9" |
57 | #define API_VERSION 88 |
58 | #define PRO_VERSION_MIN 86 |
59 | #define PRO_VERSION_MAX 95 |
60 | |
61 | |
62 | enum drbd_io_error_p { |
63 | EP_PASS_ON, /* FIXME should the better be named "Ignore"? */ |
64 | EP_CALL_HELPER, |
65 | EP_DETACH |
66 | }; |
67 | |
68 | enum drbd_fencing_p { |
69 | FP_DONT_CARE, |
70 | FP_RESOURCE, |
71 | FP_STONITH |
72 | }; |
73 | |
74 | enum drbd_disconnect_p { |
75 | DP_RECONNECT, |
76 | DP_DROP_NET_CONF, |
77 | DP_FREEZE_IO |
78 | }; |
79 | |
80 | enum drbd_after_sb_p { |
81 | ASB_DISCONNECT, |
82 | ASB_DISCARD_YOUNGER_PRI, |
83 | ASB_DISCARD_OLDER_PRI, |
84 | ASB_DISCARD_ZERO_CHG, |
85 | ASB_DISCARD_LEAST_CHG, |
86 | ASB_DISCARD_LOCAL, |
87 | ASB_DISCARD_REMOTE, |
88 | ASB_CONSENSUS, |
89 | ASB_DISCARD_SECONDARY, |
90 | ASB_CALL_HELPER, |
91 | ASB_VIOLENTLY |
92 | }; |
93 | |
94 | enum drbd_on_no_data { |
95 | OND_IO_ERROR, |
96 | OND_SUSPEND_IO |
97 | }; |
98 | |
99 | /* KEEP the order, do not delete or insert. Only append. */ |
100 | enum drbd_ret_codes { |
101 | ERR_CODE_BASE = 100, |
102 | NO_ERROR = 101, |
103 | ERR_LOCAL_ADDR = 102, |
104 | ERR_PEER_ADDR = 103, |
105 | ERR_OPEN_DISK = 104, |
106 | ERR_OPEN_MD_DISK = 105, |
107 | ERR_DISK_NOT_BDEV = 107, |
108 | ERR_MD_NOT_BDEV = 108, |
109 | ERR_DISK_TO_SMALL = 111, |
110 | ERR_MD_DISK_TO_SMALL = 112, |
111 | ERR_BDCLAIM_DISK = 114, |
112 | ERR_BDCLAIM_MD_DISK = 115, |
113 | ERR_MD_IDX_INVALID = 116, |
114 | ERR_IO_MD_DISK = 118, |
115 | ERR_MD_INVALID = 119, |
116 | ERR_AUTH_ALG = 120, |
117 | ERR_AUTH_ALG_ND = 121, |
118 | ERR_NOMEM = 122, |
119 | ERR_DISCARD = 123, |
120 | ERR_DISK_CONFIGURED = 124, |
121 | ERR_NET_CONFIGURED = 125, |
122 | ERR_MANDATORY_TAG = 126, |
123 | ERR_MINOR_INVALID = 127, |
124 | ERR_INTR = 129, /* EINTR */ |
125 | ERR_RESIZE_RESYNC = 130, |
126 | ERR_NO_PRIMARY = 131, |
127 | ERR_SYNC_AFTER = 132, |
128 | ERR_SYNC_AFTER_CYCLE = 133, |
129 | ERR_PAUSE_IS_SET = 134, |
130 | ERR_PAUSE_IS_CLEAR = 135, |
131 | ERR_PACKET_NR = 137, |
132 | ERR_NO_DISK = 138, |
133 | ERR_NOT_PROTO_C = 139, |
134 | ERR_NOMEM_BITMAP = 140, |
135 | ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */ |
136 | ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */ |
137 | ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */ |
138 | ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */ |
139 | ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */ |
140 | ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */ |
141 | ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */ |
142 | ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */ |
143 | ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */ |
144 | ERR_DATA_NOT_CURRENT = 150, |
145 | ERR_CONNECTED = 151, /* DRBD 8.3 only */ |
146 | ERR_PERM = 152, |
147 | ERR_NEED_APV_93 = 153, |
148 | ERR_STONITH_AND_PROT_A = 154, |
149 | |
150 | /* insert new ones above this line */ |
151 | AFTER_LAST_ERR_CODE |
152 | }; |
153 | |
154 | #define DRBD_PROT_A 1 |
155 | #define DRBD_PROT_B 2 |
156 | #define DRBD_PROT_C 3 |
157 | |
158 | enum drbd_role { |
159 | R_UNKNOWN = 0, |
160 | R_PRIMARY = 1, /* role */ |
161 | R_SECONDARY = 2, /* role */ |
162 | R_MASK = 3, |
163 | }; |
164 | |
165 | /* The order of these constants is important. |
166 | * The lower ones (<C_WF_REPORT_PARAMS) indicate |
167 | * that there is no socket! |
168 | * >=C_WF_REPORT_PARAMS ==> There is a socket |
169 | */ |
170 | enum drbd_conns { |
171 | C_STANDALONE, |
172 | C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ |
173 | C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ |
174 | |
175 | /* These temporal states are all used on the way |
176 | * from >= C_CONNECTED to Unconnected. |
177 | * The 'disconnect reason' states |
178 | * I do not allow to change beween them. */ |
179 | C_TIMEOUT, |
180 | C_BROKEN_PIPE, |
181 | C_NETWORK_FAILURE, |
182 | C_PROTOCOL_ERROR, |
183 | C_TEAR_DOWN, |
184 | |
185 | C_WF_CONNECTION, |
186 | C_WF_REPORT_PARAMS, /* we have a socket */ |
187 | C_CONNECTED, /* we have introduced each other */ |
188 | C_STARTING_SYNC_S, /* starting full sync by admin request. */ |
189 | C_STARTING_SYNC_T, /* stariing full sync by admin request. */ |
190 | C_WF_BITMAP_S, |
191 | C_WF_BITMAP_T, |
192 | C_WF_SYNC_UUID, |
193 | |
194 | /* All SyncStates are tested with this comparison |
195 | * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ |
196 | C_SYNC_SOURCE, |
197 | C_SYNC_TARGET, |
198 | C_VERIFY_S, |
199 | C_VERIFY_T, |
200 | C_PAUSED_SYNC_S, |
201 | C_PAUSED_SYNC_T, |
202 | C_MASK = 31 |
203 | }; |
204 | |
205 | enum drbd_disk_state { |
206 | D_DISKLESS, |
207 | D_ATTACHING, /* In the process of reading the meta-data */ |
208 | D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ |
209 | /* when >= D_FAILED it is legal to access mdev->bc */ |
210 | D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ |
211 | D_INCONSISTENT, |
212 | D_OUTDATED, |
213 | D_UNKNOWN, /* Only used for the peer, never for myself */ |
214 | D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ |
215 | D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ |
216 | D_MASK = 15 |
217 | }; |
218 | |
219 | union drbd_state { |
220 | /* According to gcc's docs is the ... |
221 | * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). |
222 | * Determined by ABI. |
223 | * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com> |
224 | * even though we transmit as "cpu_to_be32(state)", |
225 | * the offsets of the bitfields still need to be swapped |
226 | * on different endianess. |
227 | */ |
228 | struct { |
229 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
230 | unsigned role:2 ; /* 3/4 primary/secondary/unknown */ |
231 | unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ |
232 | unsigned conn:5 ; /* 17/32 cstates */ |
233 | unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ |
234 | unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ |
235 | unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ |
236 | unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ |
237 | unsigned peer_isp:1 ; |
238 | unsigned user_isp:1 ; |
239 | unsigned susp_nod:1 ; /* IO suspended because no data */ |
240 | unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/ |
241 | unsigned _pad:9; /* 0 unused */ |
242 | #elif defined(__BIG_ENDIAN_BITFIELD) |
243 | unsigned _pad:9; |
244 | unsigned susp_fen:1 ; |
245 | unsigned susp_nod:1 ; |
246 | unsigned user_isp:1 ; |
247 | unsigned peer_isp:1 ; |
248 | unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ |
249 | unsigned susp:1 ; /* 2/2 IO suspended no/yes */ |
250 | unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ |
251 | unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ |
252 | unsigned conn:5 ; /* 17/32 cstates */ |
253 | unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ |
254 | unsigned role:2 ; /* 3/4 primary/secondary/unknown */ |
255 | #else |
256 | # error "this endianess is not supported" |
257 | #endif |
258 | }; |
259 | unsigned int i; |
260 | }; |
261 | |
262 | enum drbd_state_ret_codes { |
263 | SS_CW_NO_NEED = 4, |
264 | SS_CW_SUCCESS = 3, |
265 | SS_NOTHING_TO_DO = 2, |
266 | SS_SUCCESS = 1, |
267 | SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ |
268 | SS_TWO_PRIMARIES = -1, |
269 | SS_NO_UP_TO_DATE_DISK = -2, |
270 | SS_NO_LOCAL_DISK = -4, |
271 | SS_NO_REMOTE_DISK = -5, |
272 | SS_CONNECTED_OUTDATES = -6, |
273 | SS_PRIMARY_NOP = -7, |
274 | SS_RESYNC_RUNNING = -8, |
275 | SS_ALREADY_STANDALONE = -9, |
276 | SS_CW_FAILED_BY_PEER = -10, |
277 | SS_IS_DISKLESS = -11, |
278 | SS_DEVICE_IN_USE = -12, |
279 | SS_NO_NET_CONFIG = -13, |
280 | SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ |
281 | SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ |
282 | SS_LOWER_THAN_OUTDATED = -16, |
283 | SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ |
284 | SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ |
285 | SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ |
286 | SS_AFTER_LAST_ERROR = -20, /* Keep this at bottom */ |
287 | }; |
288 | |
289 | /* from drbd_strings.c */ |
290 | extern const char *drbd_conn_str(enum drbd_conns); |
291 | extern const char *drbd_role_str(enum drbd_role); |
292 | extern const char *drbd_disk_str(enum drbd_disk_state); |
293 | extern const char *drbd_set_st_err_str(enum drbd_state_ret_codes); |
294 | |
295 | #define SHARED_SECRET_MAX 64 |
296 | |
297 | #define MDF_CONSISTENT (1 << 0) |
298 | #define MDF_PRIMARY_IND (1 << 1) |
299 | #define MDF_CONNECTED_IND (1 << 2) |
300 | #define MDF_FULL_SYNC (1 << 3) |
301 | #define MDF_WAS_UP_TO_DATE (1 << 4) |
302 | #define MDF_PEER_OUT_DATED (1 << 5) |
303 | #define MDF_CRASHED_PRIMARY (1 << 6) |
304 | |
305 | enum drbd_uuid_index { |
306 | UI_CURRENT, |
307 | UI_BITMAP, |
308 | UI_HISTORY_START, |
309 | UI_HISTORY_END, |
310 | UI_SIZE, /* nl-packet: number of dirty bits */ |
311 | UI_FLAGS, /* nl-packet: flags */ |
312 | UI_EXTENDED_SIZE /* Everything. */ |
313 | }; |
314 | |
315 | enum drbd_timeout_flag { |
316 | UT_DEFAULT = 0, |
317 | UT_DEGRADED = 1, |
318 | UT_PEER_OUTDATED = 2, |
319 | }; |
320 | |
321 | #define UUID_JUST_CREATED ((__u64)4) |
322 | |
323 | #define DRBD_MAGIC 0x83740267 |
324 | #define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC) |
325 | #define DRBD_MAGIC_BIG 0x835a |
326 | #define BE_DRBD_MAGIC_BIG __constant_cpu_to_be16(DRBD_MAGIC_BIG) |
327 | |
328 | /* these are of type "int" */ |
329 | #define DRBD_MD_INDEX_INTERNAL -1 |
330 | #define DRBD_MD_INDEX_FLEX_EXT -2 |
331 | #define DRBD_MD_INDEX_FLEX_INT -3 |
332 | |
333 | /* Start of the new netlink/connector stuff */ |
334 | |
335 | #define DRBD_NL_CREATE_DEVICE 0x01 |
336 | #define DRBD_NL_SET_DEFAULTS 0x02 |
337 | |
338 | |
339 | /* For searching a vacant cn_idx value */ |
340 | #define CN_IDX_STEP 6977 |
341 | |
342 | struct drbd_nl_cfg_req { |
343 | int packet_type; |
344 | unsigned int drbd_minor; |
345 | int flags; |
346 | unsigned short tag_list[]; |
347 | }; |
348 | |
349 | struct drbd_nl_cfg_reply { |
350 | int packet_type; |
351 | unsigned int minor; |
352 | int ret_code; /* enum ret_code or set_st_err_t */ |
353 | unsigned short tag_list[]; /* only used with get_* calls */ |
354 | }; |
355 | |
356 | #endif |
357 |
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