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 <[email protected]>. 9 Copyright (C) 2001-2008, Lars Ellenberg <[email protected]>. 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 /* Altough 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 "8.3.9" 57 #define API_VERSION 88 58 #define PRO_VERSION_MIN 86 59 #define PRO_VERSION_MAX 95 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 /* KEEP the order, do not delete or insert. Only append. */ 100 enum drbd_ret_codes { 101 ERR_CODE_BASE = 100, 102 NO_ERROR = 101, 103 ERR_LOCAL_ADDR = 102, 104 ERR_PEER_ADDR = 103, 105 ERR_OPEN_DISK = 104, 106 ERR_OPEN_MD_DISK = 105, 107 ERR_DISK_NOT_BDEV = 107, 108 ERR_MD_NOT_BDEV = 108, 109 ERR_DISK_TO_SMALL = 111, 110 ERR_MD_DISK_TO_SMALL = 112, 111 ERR_BDCLAIM_DISK = 114, 112 ERR_BDCLAIM_MD_DISK = 115, 113 ERR_MD_IDX_INVALID = 116, 114 ERR_IO_MD_DISK = 118, 115 ERR_MD_INVALID = 119, 116 ERR_AUTH_ALG = 120, 117 ERR_AUTH_ALG_ND = 121, 118 ERR_NOMEM = 122, 119 ERR_DISCARD = 123, 120 ERR_DISK_CONFIGURED = 124, 121 ERR_NET_CONFIGURED = 125, 122 ERR_MANDATORY_TAG = 126, 123 ERR_MINOR_INVALID = 127, 124 ERR_INTR = 129, /* EINTR */ 125 ERR_RESIZE_RESYNC = 130, 126 ERR_NO_PRIMARY = 131, 127 ERR_SYNC_AFTER = 132, 128 ERR_SYNC_AFTER_CYCLE = 133, 129 ERR_PAUSE_IS_SET = 134, 130 ERR_PAUSE_IS_CLEAR = 135, 131 ERR_PACKET_NR = 137, 132 ERR_NO_DISK = 138, 133 ERR_NOT_PROTO_C = 139, 134 ERR_NOMEM_BITMAP = 140, 135 ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */ 136 ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */ 137 ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */ 138 ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */ 139 ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */ 140 ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */ 141 ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */ 142 ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */ 143 ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */ 144 ERR_DATA_NOT_CURRENT = 150, 145 ERR_CONNECTED = 151, /* DRBD 8.3 only */ 146 ERR_PERM = 152, 147 ERR_NEED_APV_93 = 153, 148 ERR_STONITH_AND_PROT_A = 154, 149 150 /* insert new ones above this line */ 151 AFTER_LAST_ERR_CODE 152 }; 153 154 #define DRBD_PROT_A 1 155 #define DRBD_PROT_B 2 156 #define DRBD_PROT_C 3 157 158 enum drbd_role { 159 R_UNKNOWN = 0, 160 R_PRIMARY = 1, /* role */ 161 R_SECONDARY = 2, /* role */ 162 R_MASK = 3, 163 }; 164 165 /* The order of these constants is important. 166 * The lower ones (<C_WF_REPORT_PARAMS) indicate 167 * that there is no socket! 168 * >=C_WF_REPORT_PARAMS ==> There is a socket 169 */ 170 enum drbd_conns { 171 C_STANDALONE, 172 C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ 173 C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ 174 175 /* These temporal states are all used on the way 176 * from >= C_CONNECTED to Unconnected. 177 * The 'disconnect reason' states 178 * I do not allow to change beween them. */ 179 C_TIMEOUT, 180 C_BROKEN_PIPE, 181 C_NETWORK_FAILURE, 182 C_PROTOCOL_ERROR, 183 C_TEAR_DOWN, 184 185 C_WF_CONNECTION, 186 C_WF_REPORT_PARAMS, /* we have a socket */ 187 C_CONNECTED, /* we have introduced each other */ 188 C_STARTING_SYNC_S, /* starting full sync by admin request. */ 189 C_STARTING_SYNC_T, /* stariing full sync by admin request. */ 190 C_WF_BITMAP_S, 191 C_WF_BITMAP_T, 192 C_WF_SYNC_UUID, 193 194 /* All SyncStates are tested with this comparison 195 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ 196 C_SYNC_SOURCE, 197 C_SYNC_TARGET, 198 C_VERIFY_S, 199 C_VERIFY_T, 200 C_PAUSED_SYNC_S, 201 C_PAUSED_SYNC_T, 202 C_MASK = 31 203 }; 204 205 enum drbd_disk_state { 206 D_DISKLESS, 207 D_ATTACHING, /* In the process of reading the meta-data */ 208 D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ 209 /* when >= D_FAILED it is legal to access mdev->bc */ 210 D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ 211 D_INCONSISTENT, 212 D_OUTDATED, 213 D_UNKNOWN, /* Only used for the peer, never for myself */ 214 D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ 215 D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ 216 D_MASK = 15 217 }; 218 219 union drbd_state { 220 /* According to gcc's docs is the ... 221 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). 222 * Determined by ABI. 223 * pointed out by Maxim Uvarov q<[email protected]> 224 * even though we transmit as "cpu_to_be32(state)", 225 * the offsets of the bitfields still need to be swapped 226 * on different endianess. 227 */ 228 struct { 229 #if defined(__LITTLE_ENDIAN_BITFIELD) 230 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 231 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 232 unsigned conn:5 ; /* 17/32 cstates */ 233 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 234 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 235 unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */ 236 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 237 unsigned peer_isp:1 ; 238 unsigned user_isp:1 ; 239 unsigned susp_nod:1 ; /* IO suspended because no data */ 240 unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/ 241 unsigned _pad:9; /* 0 unused */ 242 #elif defined(__BIG_ENDIAN_BITFIELD) 243 unsigned _pad:9; 244 unsigned susp_fen:1 ; 245 unsigned susp_nod:1 ; 246 unsigned user_isp:1 ; 247 unsigned peer_isp:1 ; 248 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 249 unsigned susp:1 ; /* 2/2 IO suspended no/yes */ 250 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 251 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 252 unsigned conn:5 ; /* 17/32 cstates */ 253 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 254 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 255 #else 256 # error "this endianess is not supported" 257 #endif 258 }; 259 unsigned int i; 260 }; 261 262 enum drbd_state_ret_codes { 263 SS_CW_NO_NEED = 4, 264 SS_CW_SUCCESS = 3, 265 SS_NOTHING_TO_DO = 2, 266 SS_SUCCESS = 1, 267 SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ 268 SS_TWO_PRIMARIES = -1, 269 SS_NO_UP_TO_DATE_DISK = -2, 270 SS_NO_LOCAL_DISK = -4, 271 SS_NO_REMOTE_DISK = -5, 272 SS_CONNECTED_OUTDATES = -6, 273 SS_PRIMARY_NOP = -7, 274 SS_RESYNC_RUNNING = -8, 275 SS_ALREADY_STANDALONE = -9, 276 SS_CW_FAILED_BY_PEER = -10, 277 SS_IS_DISKLESS = -11, 278 SS_DEVICE_IN_USE = -12, 279 SS_NO_NET_CONFIG = -13, 280 SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ 281 SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ 282 SS_LOWER_THAN_OUTDATED = -16, 283 SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ 284 SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ 285 SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ 286 SS_AFTER_LAST_ERROR = -20, /* Keep this at bottom */ 287 }; 288 289 /* from drbd_strings.c */ 290 extern const char *drbd_conn_str(enum drbd_conns); 291 extern const char *drbd_role_str(enum drbd_role); 292 extern const char *drbd_disk_str(enum drbd_disk_state); 293 extern const char *drbd_set_st_err_str(enum drbd_state_ret_codes); 294 295 #define SHARED_SECRET_MAX 64 296 297 #define MDF_CONSISTENT (1 << 0) 298 #define MDF_PRIMARY_IND (1 << 1) 299 #define MDF_CONNECTED_IND (1 << 2) 300 #define MDF_FULL_SYNC (1 << 3) 301 #define MDF_WAS_UP_TO_DATE (1 << 4) 302 #define MDF_PEER_OUT_DATED (1 << 5) 303 #define MDF_CRASHED_PRIMARY (1 << 6) 304 305 enum drbd_uuid_index { 306 UI_CURRENT, 307 UI_BITMAP, 308 UI_HISTORY_START, 309 UI_HISTORY_END, 310 UI_SIZE, /* nl-packet: number of dirty bits */ 311 UI_FLAGS, /* nl-packet: flags */ 312 UI_EXTENDED_SIZE /* Everything. */ 313 }; 314 315 enum drbd_timeout_flag { 316 UT_DEFAULT = 0, 317 UT_DEGRADED = 1, 318 UT_PEER_OUTDATED = 2, 319 }; 320 321 #define UUID_JUST_CREATED ((__u64)4) 322 323 #define DRBD_MAGIC 0x83740267 324 #define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC) 325 #define DRBD_MAGIC_BIG 0x835a 326 #define BE_DRBD_MAGIC_BIG __constant_cpu_to_be16(DRBD_MAGIC_BIG) 327 328 /* these are of type "int" */ 329 #define DRBD_MD_INDEX_INTERNAL -1 330 #define DRBD_MD_INDEX_FLEX_EXT -2 331 #define DRBD_MD_INDEX_FLEX_INT -3 332 333 /* Start of the new netlink/connector stuff */ 334 335 #define DRBD_NL_CREATE_DEVICE 0x01 336 #define DRBD_NL_SET_DEFAULTS 0x02 337 338 339 /* For searching a vacant cn_idx value */ 340 #define CN_IDX_STEP 6977 341 342 struct drbd_nl_cfg_req { 343 int packet_type; 344 unsigned int drbd_minor; 345 int flags; 346 unsigned short tag_list[]; 347 }; 348 349 struct drbd_nl_cfg_reply { 350 int packet_type; 351 unsigned int minor; 352 int ret_code; /* enum ret_code or set_st_err_t */ 353 unsigned short tag_list[]; /* only used with get_* calls */ 354 }; 355 356 #endif 357