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 <asm/types.h> 29 30 #ifdef __KERNEL__ 31 #include <linux/types.h> 32 #include <asm/byteorder.h> 33 #else 34 #include <sys/types.h> 35 #include <sys/wait.h> 36 #include <limits.h> 37 38 /* Although the Linux source code makes a difference between 39 generic endianness and the bitfields' endianness, there is no 40 architecture as of Linux-2.6.24-rc4 where the bitfields' endianness 41 does not match the generic endianness. */ 42 43 #if __BYTE_ORDER == __LITTLE_ENDIAN 44 #define __LITTLE_ENDIAN_BITFIELD 45 #elif __BYTE_ORDER == __BIG_ENDIAN 46 #define __BIG_ENDIAN_BITFIELD 47 #else 48 # error "sorry, weird endianness on this box" 49 #endif 50 51 #endif 52 53 extern const char *drbd_buildtag(void); 54 #define REL_VERSION "8.4.10" 55 #define API_VERSION 1 56 #define PRO_VERSION_MIN 86 57 #define PRO_VERSION_MAX 101 58 59 60 enum drbd_io_error_p { 61 EP_PASS_ON, /* FIXME should the better be named "Ignore"? */ 62 EP_CALL_HELPER, 63 EP_DETACH 64 }; 65 66 enum drbd_fencing_p { 67 FP_NOT_AVAIL = -1, /* Not a policy */ 68 FP_DONT_CARE = 0, 69 FP_RESOURCE, 70 FP_STONITH 71 }; 72 73 enum drbd_disconnect_p { 74 DP_RECONNECT, 75 DP_DROP_NET_CONF, 76 DP_FREEZE_IO 77 }; 78 79 enum drbd_after_sb_p { 80 ASB_DISCONNECT, 81 ASB_DISCARD_YOUNGER_PRI, 82 ASB_DISCARD_OLDER_PRI, 83 ASB_DISCARD_ZERO_CHG, 84 ASB_DISCARD_LEAST_CHG, 85 ASB_DISCARD_LOCAL, 86 ASB_DISCARD_REMOTE, 87 ASB_CONSENSUS, 88 ASB_DISCARD_SECONDARY, 89 ASB_CALL_HELPER, 90 ASB_VIOLENTLY 91 }; 92 93 enum drbd_on_no_data { 94 OND_IO_ERROR, 95 OND_SUSPEND_IO 96 }; 97 98 enum drbd_on_congestion { 99 OC_BLOCK, 100 OC_PULL_AHEAD, 101 OC_DISCONNECT, 102 }; 103 104 enum drbd_read_balancing { 105 RB_PREFER_LOCAL, 106 RB_PREFER_REMOTE, 107 RB_ROUND_ROBIN, 108 RB_LEAST_PENDING, 109 RB_CONGESTED_REMOTE, 110 RB_32K_STRIPING, 111 RB_64K_STRIPING, 112 RB_128K_STRIPING, 113 RB_256K_STRIPING, 114 RB_512K_STRIPING, 115 RB_1M_STRIPING, 116 }; 117 118 /* KEEP the order, do not delete or insert. Only append. */ 119 enum drbd_ret_code { 120 ERR_CODE_BASE = 100, 121 NO_ERROR = 101, 122 ERR_LOCAL_ADDR = 102, 123 ERR_PEER_ADDR = 103, 124 ERR_OPEN_DISK = 104, 125 ERR_OPEN_MD_DISK = 105, 126 ERR_DISK_NOT_BDEV = 107, 127 ERR_MD_NOT_BDEV = 108, 128 ERR_DISK_TOO_SMALL = 111, 129 ERR_MD_DISK_TOO_SMALL = 112, 130 ERR_BDCLAIM_DISK = 114, 131 ERR_BDCLAIM_MD_DISK = 115, 132 ERR_MD_IDX_INVALID = 116, 133 ERR_IO_MD_DISK = 118, 134 ERR_MD_INVALID = 119, 135 ERR_AUTH_ALG = 120, 136 ERR_AUTH_ALG_ND = 121, 137 ERR_NOMEM = 122, 138 ERR_DISCARD_IMPOSSIBLE = 123, 139 ERR_DISK_CONFIGURED = 124, 140 ERR_NET_CONFIGURED = 125, 141 ERR_MANDATORY_TAG = 126, 142 ERR_MINOR_INVALID = 127, 143 ERR_INTR = 129, /* EINTR */ 144 ERR_RESIZE_RESYNC = 130, 145 ERR_NO_PRIMARY = 131, 146 ERR_RESYNC_AFTER = 132, 147 ERR_RESYNC_AFTER_CYCLE = 133, 148 ERR_PAUSE_IS_SET = 134, 149 ERR_PAUSE_IS_CLEAR = 135, 150 ERR_PACKET_NR = 137, 151 ERR_NO_DISK = 138, 152 ERR_NOT_PROTO_C = 139, 153 ERR_NOMEM_BITMAP = 140, 154 ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */ 155 ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */ 156 ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */ 157 ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */ 158 ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */ 159 ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */ 160 ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */ 161 ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */ 162 ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */ 163 ERR_DATA_NOT_CURRENT = 150, 164 ERR_CONNECTED = 151, /* DRBD 8.3 only */ 165 ERR_PERM = 152, 166 ERR_NEED_APV_93 = 153, 167 ERR_STONITH_AND_PROT_A = 154, 168 ERR_CONG_NOT_PROTO_A = 155, 169 ERR_PIC_AFTER_DEP = 156, 170 ERR_PIC_PEER_DEP = 157, 171 ERR_RES_NOT_KNOWN = 158, 172 ERR_RES_IN_USE = 159, 173 ERR_MINOR_CONFIGURED = 160, 174 ERR_MINOR_OR_VOLUME_EXISTS = 161, 175 ERR_INVALID_REQUEST = 162, 176 ERR_NEED_APV_100 = 163, 177 ERR_NEED_ALLOW_TWO_PRI = 164, 178 ERR_MD_UNCLEAN = 165, 179 ERR_MD_LAYOUT_CONNECTED = 166, 180 ERR_MD_LAYOUT_TOO_BIG = 167, 181 ERR_MD_LAYOUT_TOO_SMALL = 168, 182 ERR_MD_LAYOUT_NO_FIT = 169, 183 ERR_IMPLICIT_SHRINK = 170, 184 /* insert new ones above this line */ 185 AFTER_LAST_ERR_CODE 186 }; 187 188 #define DRBD_PROT_A 1 189 #define DRBD_PROT_B 2 190 #define DRBD_PROT_C 3 191 192 enum drbd_role { 193 R_UNKNOWN = 0, 194 R_PRIMARY = 1, /* role */ 195 R_SECONDARY = 2, /* role */ 196 R_MASK = 3, 197 }; 198 199 /* The order of these constants is important. 200 * The lower ones (<C_WF_REPORT_PARAMS) indicate 201 * that there is no socket! 202 * >=C_WF_REPORT_PARAMS ==> There is a socket 203 */ 204 enum drbd_conns { 205 C_STANDALONE, 206 C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ 207 C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ 208 209 /* These temporal states are all used on the way 210 * from >= C_CONNECTED to Unconnected. 211 * The 'disconnect reason' states 212 * I do not allow to change between them. */ 213 C_TIMEOUT, 214 C_BROKEN_PIPE, 215 C_NETWORK_FAILURE, 216 C_PROTOCOL_ERROR, 217 C_TEAR_DOWN, 218 219 C_WF_CONNECTION, 220 C_WF_REPORT_PARAMS, /* we have a socket */ 221 C_CONNECTED, /* we have introduced each other */ 222 C_STARTING_SYNC_S, /* starting full sync by admin request. */ 223 C_STARTING_SYNC_T, /* starting full sync by admin request. */ 224 C_WF_BITMAP_S, 225 C_WF_BITMAP_T, 226 C_WF_SYNC_UUID, 227 228 /* All SyncStates are tested with this comparison 229 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ 230 C_SYNC_SOURCE, 231 C_SYNC_TARGET, 232 C_VERIFY_S, 233 C_VERIFY_T, 234 C_PAUSED_SYNC_S, 235 C_PAUSED_SYNC_T, 236 237 C_AHEAD, 238 C_BEHIND, 239 240 C_MASK = 31 241 }; 242 243 enum drbd_disk_state { 244 D_DISKLESS, 245 D_ATTACHING, /* In the process of reading the meta-data */ 246 D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ 247 /* when >= D_FAILED it is legal to access mdev->ldev */ 248 D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ 249 D_INCONSISTENT, 250 D_OUTDATED, 251 D_UNKNOWN, /* Only used for the peer, never for myself */ 252 D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ 253 D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ 254 D_MASK = 15 255 }; 256 257 union drbd_state { 258 /* According to gcc's docs is the ... 259 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). 260 * Determined by ABI. 261 * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com> 262 * even though we transmit as "cpu_to_be32(state)", 263 * the offsets of the bitfields still need to be swapped 264 * on different endianness. 265 */ 266 struct { 267 #if defined(__LITTLE_ENDIAN_BITFIELD) 268 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 269 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 270 unsigned conn:5 ; /* 17/32 cstates */ 271 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 272 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 273 unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ 274 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 275 unsigned peer_isp:1 ; 276 unsigned user_isp:1 ; 277 unsigned susp_nod:1 ; /* IO suspended because no data */ 278 unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/ 279 unsigned _pad:9; /* 0 unused */ 280 #elif defined(__BIG_ENDIAN_BITFIELD) 281 unsigned _pad:9; 282 unsigned susp_fen:1 ; 283 unsigned susp_nod:1 ; 284 unsigned user_isp:1 ; 285 unsigned peer_isp:1 ; 286 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 287 unsigned susp:1 ; /* 2/2 IO suspended no/yes */ 288 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 289 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 290 unsigned conn:5 ; /* 17/32 cstates */ 291 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 292 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 293 #else 294 # error "this endianness is not supported" 295 #endif 296 }; 297 unsigned int i; 298 }; 299 300 enum drbd_state_rv { 301 SS_CW_NO_NEED = 4, 302 SS_CW_SUCCESS = 3, 303 SS_NOTHING_TO_DO = 2, 304 SS_SUCCESS = 1, 305 SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ 306 SS_TWO_PRIMARIES = -1, 307 SS_NO_UP_TO_DATE_DISK = -2, 308 SS_NO_LOCAL_DISK = -4, 309 SS_NO_REMOTE_DISK = -5, 310 SS_CONNECTED_OUTDATES = -6, 311 SS_PRIMARY_NOP = -7, 312 SS_RESYNC_RUNNING = -8, 313 SS_ALREADY_STANDALONE = -9, 314 SS_CW_FAILED_BY_PEER = -10, 315 SS_IS_DISKLESS = -11, 316 SS_DEVICE_IN_USE = -12, 317 SS_NO_NET_CONFIG = -13, 318 SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ 319 SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ 320 SS_LOWER_THAN_OUTDATED = -16, 321 SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ 322 SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ 323 SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ 324 SS_O_VOL_PEER_PRI = -20, 325 SS_OUTDATE_WO_CONN = -21, 326 SS_AFTER_LAST_ERROR = -22, /* Keep this at bottom */ 327 }; 328 329 #define SHARED_SECRET_MAX 64 330 331 #define MDF_CONSISTENT (1 << 0) 332 #define MDF_PRIMARY_IND (1 << 1) 333 #define MDF_CONNECTED_IND (1 << 2) 334 #define MDF_FULL_SYNC (1 << 3) 335 #define MDF_WAS_UP_TO_DATE (1 << 4) 336 #define MDF_PEER_OUT_DATED (1 << 5) 337 #define MDF_CRASHED_PRIMARY (1 << 6) 338 #define MDF_AL_CLEAN (1 << 7) 339 #define MDF_AL_DISABLED (1 << 8) 340 341 #define MAX_PEERS 32 342 343 enum drbd_uuid_index { 344 UI_CURRENT, 345 UI_BITMAP, 346 UI_HISTORY_START, 347 UI_HISTORY_END, 348 UI_SIZE, /* nl-packet: number of dirty bits */ 349 UI_FLAGS, /* nl-packet: flags */ 350 UI_EXTENDED_SIZE /* Everything. */ 351 }; 352 353 #define HISTORY_UUIDS MAX_PEERS 354 355 enum drbd_timeout_flag { 356 UT_DEFAULT = 0, 357 UT_DEGRADED = 1, 358 UT_PEER_OUTDATED = 2, 359 }; 360 361 enum drbd_notification_type { 362 NOTIFY_EXISTS, 363 NOTIFY_CREATE, 364 NOTIFY_CHANGE, 365 NOTIFY_DESTROY, 366 NOTIFY_CALL, 367 NOTIFY_RESPONSE, 368 369 NOTIFY_CONTINUES = 0x8000, 370 NOTIFY_FLAGS = NOTIFY_CONTINUES, 371 }; 372 373 enum drbd_peer_state { 374 P_INCONSISTENT = 3, 375 P_OUTDATED = 4, 376 P_DOWN = 5, 377 P_PRIMARY = 6, 378 P_FENCING = 7, 379 }; 380 381 #define UUID_JUST_CREATED ((__u64)4) 382 383 enum write_ordering_e { 384 WO_NONE, 385 WO_DRAIN_IO, 386 WO_BDEV_FLUSH, 387 WO_BIO_BARRIER 388 }; 389 390 /* magic numbers used in meta data and network packets */ 391 #define DRBD_MAGIC 0x83740267 392 #define DRBD_MAGIC_BIG 0x835a 393 #define DRBD_MAGIC_100 0x8620ec20 394 395 #define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3) 396 #define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4) 397 #define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5) 398 399 400 /* how I came up with this magic? 401 * base64 decode "actlog==" ;) */ 402 #define DRBD_AL_MAGIC 0x69cb65a2 403 404 /* these are of type "int" */ 405 #define DRBD_MD_INDEX_INTERNAL -1 406 #define DRBD_MD_INDEX_FLEX_EXT -2 407 #define DRBD_MD_INDEX_FLEX_INT -3 408 409 #define DRBD_CPU_MASK_SIZE 32 410 411 #endif 412