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b411b363 PR |
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 | ||
25985edc | 39 | /* Although the Linux source code makes a difference between |
b411b363 | 40 | generic endianness and the bitfields' endianness, there is no |
24c4830c | 41 | architecture as of Linux-2.6.24-rc4 where the bitfields' endianness |
b411b363 PR |
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); | |
9a0d9d03 | 56 | #define REL_VERSION "8.3.11" |
b411b363 PR |
57 | #define API_VERSION 88 |
58 | #define PRO_VERSION_MIN 86 | |
73a01a18 | 59 | #define PRO_VERSION_MAX 96 |
b411b363 PR |
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 | ||
265be2d0 PR |
94 | enum drbd_on_no_data { |
95 | OND_IO_ERROR, | |
96 | OND_SUSPEND_IO | |
97 | }; | |
98 | ||
422028b1 PR |
99 | enum drbd_on_congestion { |
100 | OC_BLOCK, | |
101 | OC_PULL_AHEAD, | |
102 | OC_DISCONNECT, | |
103 | }; | |
104 | ||
b411b363 | 105 | /* KEEP the order, do not delete or insert. Only append. */ |
116676ca | 106 | enum drbd_ret_code { |
b411b363 PR |
107 | ERR_CODE_BASE = 100, |
108 | NO_ERROR = 101, | |
109 | ERR_LOCAL_ADDR = 102, | |
110 | ERR_PEER_ADDR = 103, | |
111 | ERR_OPEN_DISK = 104, | |
112 | ERR_OPEN_MD_DISK = 105, | |
113 | ERR_DISK_NOT_BDEV = 107, | |
114 | ERR_MD_NOT_BDEV = 108, | |
7948bcdc LE |
115 | ERR_DISK_TOO_SMALL = 111, |
116 | ERR_MD_DISK_TOO_SMALL = 112, | |
b411b363 PR |
117 | ERR_BDCLAIM_DISK = 114, |
118 | ERR_BDCLAIM_MD_DISK = 115, | |
119 | ERR_MD_IDX_INVALID = 116, | |
120 | ERR_IO_MD_DISK = 118, | |
121 | ERR_MD_INVALID = 119, | |
122 | ERR_AUTH_ALG = 120, | |
123 | ERR_AUTH_ALG_ND = 121, | |
124 | ERR_NOMEM = 122, | |
125 | ERR_DISCARD = 123, | |
126 | ERR_DISK_CONFIGURED = 124, | |
127 | ERR_NET_CONFIGURED = 125, | |
128 | ERR_MANDATORY_TAG = 126, | |
129 | ERR_MINOR_INVALID = 127, | |
130 | ERR_INTR = 129, /* EINTR */ | |
131 | ERR_RESIZE_RESYNC = 130, | |
132 | ERR_NO_PRIMARY = 131, | |
133 | ERR_SYNC_AFTER = 132, | |
134 | ERR_SYNC_AFTER_CYCLE = 133, | |
135 | ERR_PAUSE_IS_SET = 134, | |
136 | ERR_PAUSE_IS_CLEAR = 135, | |
137 | ERR_PACKET_NR = 137, | |
138 | ERR_NO_DISK = 138, | |
139 | ERR_NOT_PROTO_C = 139, | |
140 | ERR_NOMEM_BITMAP = 140, | |
141 | ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */ | |
142 | ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */ | |
143 | ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */ | |
144 | ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */ | |
145 | ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */ | |
146 | ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */ | |
147 | ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */ | |
148 | ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */ | |
149 | ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */ | |
150 | ERR_DATA_NOT_CURRENT = 150, | |
151 | ERR_CONNECTED = 151, /* DRBD 8.3 only */ | |
9f5180e5 | 152 | ERR_PERM = 152, |
6495d2c6 | 153 | ERR_NEED_APV_93 = 153, |
47ff2d0a | 154 | ERR_STONITH_AND_PROT_A = 154, |
422028b1 | 155 | ERR_CONG_NOT_PROTO_A = 155, |
cd88d030 PR |
156 | ERR_PIC_AFTER_DEP = 156, |
157 | ERR_PIC_PEER_DEP = 157, | |
b411b363 PR |
158 | |
159 | /* insert new ones above this line */ | |
160 | AFTER_LAST_ERR_CODE | |
161 | }; | |
162 | ||
163 | #define DRBD_PROT_A 1 | |
164 | #define DRBD_PROT_B 2 | |
165 | #define DRBD_PROT_C 3 | |
166 | ||
167 | enum drbd_role { | |
168 | R_UNKNOWN = 0, | |
169 | R_PRIMARY = 1, /* role */ | |
170 | R_SECONDARY = 2, /* role */ | |
171 | R_MASK = 3, | |
172 | }; | |
173 | ||
174 | /* The order of these constants is important. | |
175 | * The lower ones (<C_WF_REPORT_PARAMS) indicate | |
176 | * that there is no socket! | |
177 | * >=C_WF_REPORT_PARAMS ==> There is a socket | |
178 | */ | |
179 | enum drbd_conns { | |
180 | C_STANDALONE, | |
181 | C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ | |
182 | C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ | |
183 | ||
184 | /* These temporal states are all used on the way | |
185 | * from >= C_CONNECTED to Unconnected. | |
186 | * The 'disconnect reason' states | |
25985edc | 187 | * I do not allow to change between them. */ |
b411b363 PR |
188 | C_TIMEOUT, |
189 | C_BROKEN_PIPE, | |
190 | C_NETWORK_FAILURE, | |
191 | C_PROTOCOL_ERROR, | |
192 | C_TEAR_DOWN, | |
193 | ||
194 | C_WF_CONNECTION, | |
195 | C_WF_REPORT_PARAMS, /* we have a socket */ | |
196 | C_CONNECTED, /* we have introduced each other */ | |
197 | C_STARTING_SYNC_S, /* starting full sync by admin request. */ | |
24c4830c | 198 | C_STARTING_SYNC_T, /* starting full sync by admin request. */ |
b411b363 PR |
199 | C_WF_BITMAP_S, |
200 | C_WF_BITMAP_T, | |
201 | C_WF_SYNC_UUID, | |
202 | ||
203 | /* All SyncStates are tested with this comparison | |
204 | * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ | |
205 | C_SYNC_SOURCE, | |
206 | C_SYNC_TARGET, | |
207 | C_VERIFY_S, | |
208 | C_VERIFY_T, | |
209 | C_PAUSED_SYNC_S, | |
210 | C_PAUSED_SYNC_T, | |
67531718 PR |
211 | |
212 | C_AHEAD, | |
213 | C_BEHIND, | |
214 | ||
b411b363 PR |
215 | C_MASK = 31 |
216 | }; | |
217 | ||
218 | enum drbd_disk_state { | |
219 | D_DISKLESS, | |
220 | D_ATTACHING, /* In the process of reading the meta-data */ | |
221 | D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ | |
222 | /* when >= D_FAILED it is legal to access mdev->bc */ | |
223 | D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ | |
224 | D_INCONSISTENT, | |
225 | D_OUTDATED, | |
226 | D_UNKNOWN, /* Only used for the peer, never for myself */ | |
227 | D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ | |
228 | D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ | |
229 | D_MASK = 15 | |
230 | }; | |
231 | ||
232 | union drbd_state { | |
233 | /* According to gcc's docs is the ... | |
234 | * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). | |
235 | * Determined by ABI. | |
236 | * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com> | |
237 | * even though we transmit as "cpu_to_be32(state)", | |
238 | * the offsets of the bitfields still need to be swapped | |
24c4830c | 239 | * on different endianness. |
b411b363 PR |
240 | */ |
241 | struct { | |
242 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
243 | unsigned role:2 ; /* 3/4 primary/secondary/unknown */ | |
244 | unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ | |
245 | unsigned conn:5 ; /* 17/32 cstates */ | |
246 | unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
247 | unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
fb22c402 | 248 | unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ |
b411b363 PR |
249 | unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ |
250 | unsigned peer_isp:1 ; | |
251 | unsigned user_isp:1 ; | |
fb22c402 PR |
252 | unsigned susp_nod:1 ; /* IO suspended because no data */ |
253 | unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/ | |
254 | unsigned _pad:9; /* 0 unused */ | |
b411b363 | 255 | #elif defined(__BIG_ENDIAN_BITFIELD) |
fb22c402 PR |
256 | unsigned _pad:9; |
257 | unsigned susp_fen:1 ; | |
258 | unsigned susp_nod:1 ; | |
b411b363 PR |
259 | unsigned user_isp:1 ; |
260 | unsigned peer_isp:1 ; | |
261 | unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ | |
262 | unsigned susp:1 ; /* 2/2 IO suspended no/yes */ | |
263 | unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
264 | unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
265 | unsigned conn:5 ; /* 17/32 cstates */ | |
266 | unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ | |
267 | unsigned role:2 ; /* 3/4 primary/secondary/unknown */ | |
268 | #else | |
24c4830c | 269 | # error "this endianness is not supported" |
b411b363 PR |
270 | #endif |
271 | }; | |
272 | unsigned int i; | |
273 | }; | |
274 | ||
c8b32563 | 275 | enum drbd_state_rv { |
b411b363 PR |
276 | SS_CW_NO_NEED = 4, |
277 | SS_CW_SUCCESS = 3, | |
278 | SS_NOTHING_TO_DO = 2, | |
279 | SS_SUCCESS = 1, | |
280 | SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ | |
281 | SS_TWO_PRIMARIES = -1, | |
282 | SS_NO_UP_TO_DATE_DISK = -2, | |
283 | SS_NO_LOCAL_DISK = -4, | |
284 | SS_NO_REMOTE_DISK = -5, | |
285 | SS_CONNECTED_OUTDATES = -6, | |
286 | SS_PRIMARY_NOP = -7, | |
287 | SS_RESYNC_RUNNING = -8, | |
288 | SS_ALREADY_STANDALONE = -9, | |
289 | SS_CW_FAILED_BY_PEER = -10, | |
290 | SS_IS_DISKLESS = -11, | |
291 | SS_DEVICE_IN_USE = -12, | |
292 | SS_NO_NET_CONFIG = -13, | |
293 | SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ | |
294 | SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ | |
295 | SS_LOWER_THAN_OUTDATED = -16, | |
296 | SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ | |
297 | SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ | |
298 | SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ | |
299 | SS_AFTER_LAST_ERROR = -20, /* Keep this at bottom */ | |
300 | }; | |
301 | ||
302 | /* from drbd_strings.c */ | |
303 | extern const char *drbd_conn_str(enum drbd_conns); | |
304 | extern const char *drbd_role_str(enum drbd_role); | |
305 | extern const char *drbd_disk_str(enum drbd_disk_state); | |
c8b32563 | 306 | extern const char *drbd_set_st_err_str(enum drbd_state_rv); |
b411b363 PR |
307 | |
308 | #define SHARED_SECRET_MAX 64 | |
309 | ||
310 | #define MDF_CONSISTENT (1 << 0) | |
311 | #define MDF_PRIMARY_IND (1 << 1) | |
312 | #define MDF_CONNECTED_IND (1 << 2) | |
313 | #define MDF_FULL_SYNC (1 << 3) | |
314 | #define MDF_WAS_UP_TO_DATE (1 << 4) | |
315 | #define MDF_PEER_OUT_DATED (1 << 5) | |
316 | #define MDF_CRASHED_PRIMARY (1 << 6) | |
317 | ||
318 | enum drbd_uuid_index { | |
319 | UI_CURRENT, | |
320 | UI_BITMAP, | |
321 | UI_HISTORY_START, | |
322 | UI_HISTORY_END, | |
323 | UI_SIZE, /* nl-packet: number of dirty bits */ | |
324 | UI_FLAGS, /* nl-packet: flags */ | |
325 | UI_EXTENDED_SIZE /* Everything. */ | |
326 | }; | |
327 | ||
328 | enum drbd_timeout_flag { | |
329 | UT_DEFAULT = 0, | |
330 | UT_DEGRADED = 1, | |
331 | UT_PEER_OUTDATED = 2, | |
332 | }; | |
333 | ||
334 | #define UUID_JUST_CREATED ((__u64)4) | |
335 | ||
336 | #define DRBD_MAGIC 0x83740267 | |
337 | #define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC) | |
0b70a13d PR |
338 | #define DRBD_MAGIC_BIG 0x835a |
339 | #define BE_DRBD_MAGIC_BIG __constant_cpu_to_be16(DRBD_MAGIC_BIG) | |
b411b363 PR |
340 | |
341 | /* these are of type "int" */ | |
342 | #define DRBD_MD_INDEX_INTERNAL -1 | |
343 | #define DRBD_MD_INDEX_FLEX_EXT -2 | |
344 | #define DRBD_MD_INDEX_FLEX_INT -3 | |
345 | ||
346 | /* Start of the new netlink/connector stuff */ | |
347 | ||
348 | #define DRBD_NL_CREATE_DEVICE 0x01 | |
349 | #define DRBD_NL_SET_DEFAULTS 0x02 | |
350 | ||
b411b363 PR |
351 | |
352 | /* For searching a vacant cn_idx value */ | |
353 | #define CN_IDX_STEP 6977 | |
354 | ||
355 | struct drbd_nl_cfg_req { | |
356 | int packet_type; | |
357 | unsigned int drbd_minor; | |
358 | int flags; | |
359 | unsigned short tag_list[]; | |
360 | }; | |
361 | ||
362 | struct drbd_nl_cfg_reply { | |
363 | int packet_type; | |
364 | unsigned int minor; | |
365 | int ret_code; /* enum ret_code or set_st_err_t */ | |
366 | unsigned short tag_list[]; /* only used with get_* calls */ | |
367 | }; | |
368 | ||
369 | #endif |