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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 | /* Although 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 bitfields' 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 | extern const char *drbd_buildtag(void); | |
55 | #define REL_VERSION "8.4.5" | |
56 | #define API_VERSION 1 | |
57 | #define PRO_VERSION_MIN 86 | |
58 | #define PRO_VERSION_MAX 101 | |
59 | ||
60 | ||
61 | enum drbd_io_error_p { | |
62 | EP_PASS_ON, /* FIXME should the better be named "Ignore"? */ | |
63 | EP_CALL_HELPER, | |
64 | EP_DETACH | |
65 | }; | |
66 | ||
67 | enum drbd_fencing_p { | |
68 | FP_NOT_AVAIL = -1, /* Not a policy */ | |
69 | FP_DONT_CARE = 0, | |
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 | enum drbd_on_congestion { | |
100 | OC_BLOCK, | |
101 | OC_PULL_AHEAD, | |
102 | OC_DISCONNECT, | |
103 | }; | |
104 | ||
105 | enum drbd_read_balancing { | |
106 | RB_PREFER_LOCAL, | |
107 | RB_PREFER_REMOTE, | |
108 | RB_ROUND_ROBIN, | |
109 | RB_LEAST_PENDING, | |
110 | RB_CONGESTED_REMOTE, | |
111 | RB_32K_STRIPING, | |
112 | RB_64K_STRIPING, | |
113 | RB_128K_STRIPING, | |
114 | RB_256K_STRIPING, | |
115 | RB_512K_STRIPING, | |
116 | RB_1M_STRIPING, | |
117 | }; | |
118 | ||
119 | /* KEEP the order, do not delete or insert. Only append. */ | |
120 | enum drbd_ret_code { | |
121 | ERR_CODE_BASE = 100, | |
122 | NO_ERROR = 101, | |
123 | ERR_LOCAL_ADDR = 102, | |
124 | ERR_PEER_ADDR = 103, | |
125 | ERR_OPEN_DISK = 104, | |
126 | ERR_OPEN_MD_DISK = 105, | |
127 | ERR_DISK_NOT_BDEV = 107, | |
128 | ERR_MD_NOT_BDEV = 108, | |
129 | ERR_DISK_TOO_SMALL = 111, | |
130 | ERR_MD_DISK_TOO_SMALL = 112, | |
131 | ERR_BDCLAIM_DISK = 114, | |
132 | ERR_BDCLAIM_MD_DISK = 115, | |
133 | ERR_MD_IDX_INVALID = 116, | |
134 | ERR_IO_MD_DISK = 118, | |
135 | ERR_MD_INVALID = 119, | |
136 | ERR_AUTH_ALG = 120, | |
137 | ERR_AUTH_ALG_ND = 121, | |
138 | ERR_NOMEM = 122, | |
139 | ERR_DISCARD_IMPOSSIBLE = 123, | |
140 | ERR_DISK_CONFIGURED = 124, | |
141 | ERR_NET_CONFIGURED = 125, | |
142 | ERR_MANDATORY_TAG = 126, | |
143 | ERR_MINOR_INVALID = 127, | |
144 | ERR_INTR = 129, /* EINTR */ | |
145 | ERR_RESIZE_RESYNC = 130, | |
146 | ERR_NO_PRIMARY = 131, | |
147 | ERR_RESYNC_AFTER = 132, | |
148 | ERR_RESYNC_AFTER_CYCLE = 133, | |
149 | ERR_PAUSE_IS_SET = 134, | |
150 | ERR_PAUSE_IS_CLEAR = 135, | |
151 | ERR_PACKET_NR = 137, | |
152 | ERR_NO_DISK = 138, | |
153 | ERR_NOT_PROTO_C = 139, | |
154 | ERR_NOMEM_BITMAP = 140, | |
155 | ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */ | |
156 | ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */ | |
157 | ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */ | |
158 | ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */ | |
159 | ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */ | |
160 | ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */ | |
161 | ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */ | |
162 | ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */ | |
163 | ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */ | |
164 | ERR_DATA_NOT_CURRENT = 150, | |
165 | ERR_CONNECTED = 151, /* DRBD 8.3 only */ | |
166 | ERR_PERM = 152, | |
167 | ERR_NEED_APV_93 = 153, | |
168 | ERR_STONITH_AND_PROT_A = 154, | |
169 | ERR_CONG_NOT_PROTO_A = 155, | |
170 | ERR_PIC_AFTER_DEP = 156, | |
171 | ERR_PIC_PEER_DEP = 157, | |
172 | ERR_RES_NOT_KNOWN = 158, | |
173 | ERR_RES_IN_USE = 159, | |
174 | ERR_MINOR_CONFIGURED = 160, | |
175 | ERR_MINOR_OR_VOLUME_EXISTS = 161, | |
176 | ERR_INVALID_REQUEST = 162, | |
177 | ERR_NEED_APV_100 = 163, | |
178 | ERR_NEED_ALLOW_TWO_PRI = 164, | |
179 | ERR_MD_UNCLEAN = 165, | |
180 | ERR_MD_LAYOUT_CONNECTED = 166, | |
181 | ERR_MD_LAYOUT_TOO_BIG = 167, | |
182 | ERR_MD_LAYOUT_TOO_SMALL = 168, | |
183 | ERR_MD_LAYOUT_NO_FIT = 169, | |
184 | ERR_IMPLICIT_SHRINK = 170, | |
185 | /* insert new ones above this line */ | |
186 | AFTER_LAST_ERR_CODE | |
187 | }; | |
188 | ||
189 | #define DRBD_PROT_A 1 | |
190 | #define DRBD_PROT_B 2 | |
191 | #define DRBD_PROT_C 3 | |
192 | ||
193 | enum drbd_role { | |
194 | R_UNKNOWN = 0, | |
195 | R_PRIMARY = 1, /* role */ | |
196 | R_SECONDARY = 2, /* role */ | |
197 | R_MASK = 3, | |
198 | }; | |
199 | ||
200 | /* The order of these constants is important. | |
201 | * The lower ones (<C_WF_REPORT_PARAMS) indicate | |
202 | * that there is no socket! | |
203 | * >=C_WF_REPORT_PARAMS ==> There is a socket | |
204 | */ | |
205 | enum drbd_conns { | |
206 | C_STANDALONE, | |
207 | C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ | |
208 | C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ | |
209 | ||
210 | /* These temporal states are all used on the way | |
211 | * from >= C_CONNECTED to Unconnected. | |
212 | * The 'disconnect reason' states | |
213 | * I do not allow to change between them. */ | |
214 | C_TIMEOUT, | |
215 | C_BROKEN_PIPE, | |
216 | C_NETWORK_FAILURE, | |
217 | C_PROTOCOL_ERROR, | |
218 | C_TEAR_DOWN, | |
219 | ||
220 | C_WF_CONNECTION, | |
221 | C_WF_REPORT_PARAMS, /* we have a socket */ | |
222 | C_CONNECTED, /* we have introduced each other */ | |
223 | C_STARTING_SYNC_S, /* starting full sync by admin request. */ | |
224 | C_STARTING_SYNC_T, /* starting full sync by admin request. */ | |
225 | C_WF_BITMAP_S, | |
226 | C_WF_BITMAP_T, | |
227 | C_WF_SYNC_UUID, | |
228 | ||
229 | /* All SyncStates are tested with this comparison | |
230 | * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ | |
231 | C_SYNC_SOURCE, | |
232 | C_SYNC_TARGET, | |
233 | C_VERIFY_S, | |
234 | C_VERIFY_T, | |
235 | C_PAUSED_SYNC_S, | |
236 | C_PAUSED_SYNC_T, | |
237 | ||
238 | C_AHEAD, | |
239 | C_BEHIND, | |
240 | ||
241 | C_MASK = 31 | |
242 | }; | |
243 | ||
244 | enum drbd_disk_state { | |
245 | D_DISKLESS, | |
246 | D_ATTACHING, /* In the process of reading the meta-data */ | |
247 | D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ | |
248 | /* when >= D_FAILED it is legal to access mdev->ldev */ | |
249 | D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ | |
250 | D_INCONSISTENT, | |
251 | D_OUTDATED, | |
252 | D_UNKNOWN, /* Only used for the peer, never for myself */ | |
253 | D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ | |
254 | D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ | |
255 | D_MASK = 15 | |
256 | }; | |
257 | ||
258 | union drbd_state { | |
259 | /* According to gcc's docs is the ... | |
260 | * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). | |
261 | * Determined by ABI. | |
262 | * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com> | |
263 | * even though we transmit as "cpu_to_be32(state)", | |
264 | * the offsets of the bitfields still need to be swapped | |
265 | * on different endianness. | |
266 | */ | |
267 | struct { | |
268 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
269 | unsigned role:2 ; /* 3/4 primary/secondary/unknown */ | |
270 | unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ | |
271 | unsigned conn:5 ; /* 17/32 cstates */ | |
272 | unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
273 | unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
274 | unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ | |
275 | unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ | |
276 | unsigned peer_isp:1 ; | |
277 | unsigned user_isp:1 ; | |
278 | unsigned susp_nod:1 ; /* IO suspended because no data */ | |
279 | unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/ | |
280 | unsigned _pad:9; /* 0 unused */ | |
281 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
282 | unsigned _pad:9; | |
283 | unsigned susp_fen:1 ; | |
284 | unsigned susp_nod:1 ; | |
285 | unsigned user_isp:1 ; | |
286 | unsigned peer_isp:1 ; | |
287 | unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ | |
288 | unsigned susp:1 ; /* 2/2 IO suspended no/yes */ | |
289 | unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
290 | unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ | |
291 | unsigned conn:5 ; /* 17/32 cstates */ | |
292 | unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ | |
293 | unsigned role:2 ; /* 3/4 primary/secondary/unknown */ | |
294 | #else | |
295 | # error "this endianness is not supported" | |
296 | #endif | |
297 | }; | |
298 | unsigned int i; | |
299 | }; | |
300 | ||
301 | enum drbd_state_rv { | |
302 | SS_CW_NO_NEED = 4, | |
303 | SS_CW_SUCCESS = 3, | |
304 | SS_NOTHING_TO_DO = 2, | |
305 | SS_SUCCESS = 1, | |
306 | SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ | |
307 | SS_TWO_PRIMARIES = -1, | |
308 | SS_NO_UP_TO_DATE_DISK = -2, | |
309 | SS_NO_LOCAL_DISK = -4, | |
310 | SS_NO_REMOTE_DISK = -5, | |
311 | SS_CONNECTED_OUTDATES = -6, | |
312 | SS_PRIMARY_NOP = -7, | |
313 | SS_RESYNC_RUNNING = -8, | |
314 | SS_ALREADY_STANDALONE = -9, | |
315 | SS_CW_FAILED_BY_PEER = -10, | |
316 | SS_IS_DISKLESS = -11, | |
317 | SS_DEVICE_IN_USE = -12, | |
318 | SS_NO_NET_CONFIG = -13, | |
319 | SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ | |
320 | SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ | |
321 | SS_LOWER_THAN_OUTDATED = -16, | |
322 | SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ | |
323 | SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ | |
324 | SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ | |
325 | SS_O_VOL_PEER_PRI = -20, | |
326 | SS_OUTDATE_WO_CONN = -21, | |
327 | SS_AFTER_LAST_ERROR = -22, /* Keep this at bottom */ | |
328 | }; | |
329 | ||
330 | #define SHARED_SECRET_MAX 64 | |
331 | ||
332 | #define MDF_CONSISTENT (1 << 0) | |
333 | #define MDF_PRIMARY_IND (1 << 1) | |
334 | #define MDF_CONNECTED_IND (1 << 2) | |
335 | #define MDF_FULL_SYNC (1 << 3) | |
336 | #define MDF_WAS_UP_TO_DATE (1 << 4) | |
337 | #define MDF_PEER_OUT_DATED (1 << 5) | |
338 | #define MDF_CRASHED_PRIMARY (1 << 6) | |
339 | #define MDF_AL_CLEAN (1 << 7) | |
340 | #define MDF_AL_DISABLED (1 << 8) | |
341 | ||
342 | enum drbd_uuid_index { | |
343 | UI_CURRENT, | |
344 | UI_BITMAP, | |
345 | UI_HISTORY_START, | |
346 | UI_HISTORY_END, | |
347 | UI_SIZE, /* nl-packet: number of dirty bits */ | |
348 | UI_FLAGS, /* nl-packet: flags */ | |
349 | UI_EXTENDED_SIZE /* Everything. */ | |
350 | }; | |
351 | ||
352 | enum drbd_timeout_flag { | |
353 | UT_DEFAULT = 0, | |
354 | UT_DEGRADED = 1, | |
355 | UT_PEER_OUTDATED = 2, | |
356 | }; | |
357 | ||
358 | #define UUID_JUST_CREATED ((__u64)4) | |
359 | ||
360 | /* magic numbers used in meta data and network packets */ | |
361 | #define DRBD_MAGIC 0x83740267 | |
362 | #define DRBD_MAGIC_BIG 0x835a | |
363 | #define DRBD_MAGIC_100 0x8620ec20 | |
364 | ||
365 | #define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3) | |
366 | #define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4) | |
367 | #define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5) | |
368 | ||
369 | ||
370 | /* how I came up with this magic? | |
371 | * base64 decode "actlog==" ;) */ | |
372 | #define DRBD_AL_MAGIC 0x69cb65a2 | |
373 | ||
374 | /* these are of type "int" */ | |
375 | #define DRBD_MD_INDEX_INTERNAL -1 | |
376 | #define DRBD_MD_INDEX_FLEX_EXT -2 | |
377 | #define DRBD_MD_INDEX_FLEX_INT -3 | |
378 | ||
379 | #define DRBD_CPU_MASK_SIZE 32 | |
380 | ||
381 | #endif |