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 "8.4.3" 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_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, 180 181 /* insert new ones above this line */ 182 AFTER_LAST_ERR_CODE 183 }; 184 185 #define DRBD_PROT_A 1 186 #define DRBD_PROT_B 2 187 #define DRBD_PROT_C 3 188 189 enum drbd_role { 190 R_UNKNOWN = 0, 191 R_PRIMARY = 1, /* role */ 192 R_SECONDARY = 2, /* role */ 193 R_MASK = 3, 194 }; 195 196 /* The order of these constants is important. 197 * The lower ones (<C_WF_REPORT_PARAMS) indicate 198 * that there is no socket! 199 * >=C_WF_REPORT_PARAMS ==> There is a socket 200 */ 201 enum drbd_conns { 202 C_STANDALONE, 203 C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ 204 C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ 205 206 /* These temporal states are all used on the way 207 * from >= C_CONNECTED to Unconnected. 208 * The 'disconnect reason' states 209 * I do not allow to change between them. */ 210 C_TIMEOUT, 211 C_BROKEN_PIPE, 212 C_NETWORK_FAILURE, 213 C_PROTOCOL_ERROR, 214 C_TEAR_DOWN, 215 216 C_WF_CONNECTION, 217 C_WF_REPORT_PARAMS, /* we have a socket */ 218 C_CONNECTED, /* we have introduced each other */ 219 C_STARTING_SYNC_S, /* starting full sync by admin request. */ 220 C_STARTING_SYNC_T, /* starting full sync by admin request. */ 221 C_WF_BITMAP_S, 222 C_WF_BITMAP_T, 223 C_WF_SYNC_UUID, 224 225 /* All SyncStates are tested with this comparison 226 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ 227 C_SYNC_SOURCE, 228 C_SYNC_TARGET, 229 C_VERIFY_S, 230 C_VERIFY_T, 231 C_PAUSED_SYNC_S, 232 C_PAUSED_SYNC_T, 233 234 C_AHEAD, 235 C_BEHIND, 236 237 C_MASK = 31 238 }; 239 240 enum drbd_disk_state { 241 D_DISKLESS, 242 D_ATTACHING, /* In the process of reading the meta-data */ 243 D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ 244 /* when >= D_FAILED it is legal to access mdev->bc */ 245 D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ 246 D_INCONSISTENT, 247 D_OUTDATED, 248 D_UNKNOWN, /* Only used for the peer, never for myself */ 249 D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ 250 D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ 251 D_MASK = 15 252 }; 253 254 union drbd_state { 255 /* According to gcc's docs is the ... 256 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). 257 * Determined by ABI. 258 * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com> 259 * even though we transmit as "cpu_to_be32(state)", 260 * the offsets of the bitfields still need to be swapped 261 * on different endianness. 262 */ 263 struct { 264 #if defined(__LITTLE_ENDIAN_BITFIELD) 265 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 266 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 267 unsigned conn:5 ; /* 17/32 cstates */ 268 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 269 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 270 unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ 271 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 272 unsigned peer_isp:1 ; 273 unsigned user_isp:1 ; 274 unsigned susp_nod:1 ; /* IO suspended because no data */ 275 unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/ 276 unsigned _pad:9; /* 0 unused */ 277 #elif defined(__BIG_ENDIAN_BITFIELD) 278 unsigned _pad:9; 279 unsigned susp_fen:1 ; 280 unsigned susp_nod:1 ; 281 unsigned user_isp:1 ; 282 unsigned peer_isp:1 ; 283 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 284 unsigned susp:1 ; /* 2/2 IO suspended no/yes */ 285 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 286 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 287 unsigned conn:5 ; /* 17/32 cstates */ 288 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 289 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 290 #else 291 # error "this endianness is not supported" 292 #endif 293 }; 294 unsigned int i; 295 }; 296 297 enum drbd_state_rv { 298 SS_CW_NO_NEED = 4, 299 SS_CW_SUCCESS = 3, 300 SS_NOTHING_TO_DO = 2, 301 SS_SUCCESS = 1, 302 SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ 303 SS_TWO_PRIMARIES = -1, 304 SS_NO_UP_TO_DATE_DISK = -2, 305 SS_NO_LOCAL_DISK = -4, 306 SS_NO_REMOTE_DISK = -5, 307 SS_CONNECTED_OUTDATES = -6, 308 SS_PRIMARY_NOP = -7, 309 SS_RESYNC_RUNNING = -8, 310 SS_ALREADY_STANDALONE = -9, 311 SS_CW_FAILED_BY_PEER = -10, 312 SS_IS_DISKLESS = -11, 313 SS_DEVICE_IN_USE = -12, 314 SS_NO_NET_CONFIG = -13, 315 SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ 316 SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ 317 SS_LOWER_THAN_OUTDATED = -16, 318 SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ 319 SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ 320 SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ 321 SS_O_VOL_PEER_PRI = -20, 322 SS_OUTDATE_WO_CONN = -21, 323 SS_AFTER_LAST_ERROR = -22, /* Keep this at bottom */ 324 }; 325 326 /* from drbd_strings.c */ 327 extern const char *drbd_conn_str(enum drbd_conns); 328 extern const char *drbd_role_str(enum drbd_role); 329 extern const char *drbd_disk_str(enum drbd_disk_state); 330 extern const char *drbd_set_st_err_str(enum drbd_state_rv); 331 332 #define SHARED_SECRET_MAX 64 333 334 #define MDF_CONSISTENT (1 << 0) 335 #define MDF_PRIMARY_IND (1 << 1) 336 #define MDF_CONNECTED_IND (1 << 2) 337 #define MDF_FULL_SYNC (1 << 3) 338 #define MDF_WAS_UP_TO_DATE (1 << 4) 339 #define MDF_PEER_OUT_DATED (1 << 5) 340 #define MDF_CRASHED_PRIMARY (1 << 6) 341 #define MDF_AL_CLEAN (1 << 7) 342 #define MDF_AL_DISABLED (1 << 8) 343 344 enum drbd_uuid_index { 345 UI_CURRENT, 346 UI_BITMAP, 347 UI_HISTORY_START, 348 UI_HISTORY_END, 349 UI_SIZE, /* nl-packet: number of dirty bits */ 350 UI_FLAGS, /* nl-packet: flags */ 351 UI_EXTENDED_SIZE /* Everything. */ 352 }; 353 354 enum drbd_timeout_flag { 355 UT_DEFAULT = 0, 356 UT_DEGRADED = 1, 357 UT_PEER_OUTDATED = 2, 358 }; 359 360 #define UUID_JUST_CREATED ((__u64)4) 361 362 /* magic numbers used in meta data and network packets */ 363 #define DRBD_MAGIC 0x83740267 364 #define DRBD_MAGIC_BIG 0x835a 365 #define DRBD_MAGIC_100 0x8620ec20 366 367 #define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3) 368 #define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4) 369 #define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5) 370 371 372 /* how I came up with this magic? 373 * base64 decode "actlog==" ;) */ 374 #define DRBD_AL_MAGIC 0x69cb65a2 375 376 /* these are of type "int" */ 377 #define DRBD_MD_INDEX_INTERNAL -1 378 #define DRBD_MD_INDEX_FLEX_EXT -2 379 #define DRBD_MD_INDEX_FLEX_INT -3 380 381 #endif 382