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 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 "8.3.10" 57 #define API_VERSION 88 58 #define PRO_VERSION_MIN 86 59 #define PRO_VERSION_MAX 96 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 enum drbd_on_congestion { 100 OC_BLOCK, 101 OC_PULL_AHEAD, 102 OC_DISCONNECT, 103 }; 104 105 /* KEEP the order, do not delete or insert. Only append. */ 106 enum drbd_ret_code { 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, 115 ERR_DISK_TO_SMALL = 111, 116 ERR_MD_DISK_TO_SMALL = 112, 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 */ 152 ERR_PERM = 152, 153 ERR_NEED_APV_93 = 153, 154 ERR_STONITH_AND_PROT_A = 154, 155 ERR_CONG_NOT_PROTO_A = 155, 156 ERR_PIC_AFTER_DEP = 156, 157 ERR_PIC_PEER_DEP = 157, 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 187 * I do not allow to change between them. */ 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. */ 198 C_STARTING_SYNC_T, /* stariing full sync by admin request. */ 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, 211 212 C_AHEAD, 213 C_BEHIND, 214 215 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 239 * on different endianess. 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 */ 248 unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ 249 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 250 unsigned peer_isp:1 ; 251 unsigned user_isp:1 ; 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 */ 255 #elif defined(__BIG_ENDIAN_BITFIELD) 256 unsigned _pad:9; 257 unsigned susp_fen:1 ; 258 unsigned susp_nod:1 ; 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 269 # error "this endianess is not supported" 270 #endif 271 }; 272 unsigned int i; 273 }; 274 275 enum drbd_state_rv { 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); 306 extern const char *drbd_set_st_err_str(enum drbd_state_rv); 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) 338 #define DRBD_MAGIC_BIG 0x835a 339 #define BE_DRBD_MAGIC_BIG __constant_cpu_to_be16(DRBD_MAGIC_BIG) 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 350 351 352 /* 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 370