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/* 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 55extern const char *drbd_buildtag(void); 56#define REL_VERSION "8.3.8.1" 57#define API_VERSION 88 58#define PRO_VERSION_MIN 86 59#define PRO_VERSION_MAX 94 60 61 62enum drbd_io_error_p { 63 EP_PASS_ON, 64 EP_CALL_HELPER, 65 EP_DETACH 66}; 67 68enum drbd_fencing_p { 69 FP_DONT_CARE, 70 FP_RESOURCE, 71 FP_STONITH 72}; 73 74enum drbd_disconnect_p { 75 DP_RECONNECT, 76 DP_DROP_NET_CONF, 77 DP_FREEZE_IO 78}; 79 80enum 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/* KEEP the order, do not delete or insert. Only append. */ 95enum drbd_ret_codes { 96 ERR_CODE_BASE = 100, 97 NO_ERROR = 101, 98 ERR_LOCAL_ADDR = 102, 99 ERR_PEER_ADDR = 103, 100 ERR_OPEN_DISK = 104, 101 ERR_OPEN_MD_DISK = 105, 102 ERR_DISK_NOT_BDEV = 107, 103 ERR_MD_NOT_BDEV = 108, 104 ERR_DISK_TO_SMALL = 111, 105 ERR_MD_DISK_TO_SMALL = 112, 106 ERR_BDCLAIM_DISK = 114, 107 ERR_BDCLAIM_MD_DISK = 115, 108 ERR_MD_IDX_INVALID = 116, 109 ERR_IO_MD_DISK = 118, 110 ERR_MD_INVALID = 119, 111 ERR_AUTH_ALG = 120, 112 ERR_AUTH_ALG_ND = 121, 113 ERR_NOMEM = 122, 114 ERR_DISCARD = 123, 115 ERR_DISK_CONFIGURED = 124, 116 ERR_NET_CONFIGURED = 125, 117 ERR_MANDATORY_TAG = 126, 118 ERR_MINOR_INVALID = 127, 119 ERR_INTR = 129, /* EINTR */ 120 ERR_RESIZE_RESYNC = 130, 121 ERR_NO_PRIMARY = 131, 122 ERR_SYNC_AFTER = 132, 123 ERR_SYNC_AFTER_CYCLE = 133, 124 ERR_PAUSE_IS_SET = 134, 125 ERR_PAUSE_IS_CLEAR = 135, 126 ERR_PACKET_NR = 137, 127 ERR_NO_DISK = 138, 128 ERR_NOT_PROTO_C = 139, 129 ERR_NOMEM_BITMAP = 140, 130 ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */ 131 ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */ 132 ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */ 133 ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */ 134 ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */ 135 ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */ 136 ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */ 137 ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */ 138 ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */ 139 ERR_DATA_NOT_CURRENT = 150, 140 ERR_CONNECTED = 151, /* DRBD 8.3 only */ 141 ERR_PERM = 152, 142 ERR_NEED_APV_93 = 153, 143 144 /* insert new ones above this line */ 145 AFTER_LAST_ERR_CODE 146}; 147 148#define DRBD_PROT_A 1 149#define DRBD_PROT_B 2 150#define DRBD_PROT_C 3 151 152enum drbd_role { 153 R_UNKNOWN = 0, 154 R_PRIMARY = 1, /* role */ 155 R_SECONDARY = 2, /* role */ 156 R_MASK = 3, 157}; 158 159/* The order of these constants is important. 160 * The lower ones (<C_WF_REPORT_PARAMS) indicate 161 * that there is no socket! 162 * >=C_WF_REPORT_PARAMS ==> There is a socket 163 */ 164enum drbd_conns { 165 C_STANDALONE, 166 C_DISCONNECTING, /* Temporal state on the way to StandAlone. */ 167 C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */ 168 169 /* These temporal states are all used on the way 170 * from >= C_CONNECTED to Unconnected. 171 * The 'disconnect reason' states 172 * I do not allow to change beween them. */ 173 C_TIMEOUT, 174 C_BROKEN_PIPE, 175 C_NETWORK_FAILURE, 176 C_PROTOCOL_ERROR, 177 C_TEAR_DOWN, 178 179 C_WF_CONNECTION, 180 C_WF_REPORT_PARAMS, /* we have a socket */ 181 C_CONNECTED, /* we have introduced each other */ 182 C_STARTING_SYNC_S, /* starting full sync by admin request. */ 183 C_STARTING_SYNC_T, /* stariing full sync by admin request. */ 184 C_WF_BITMAP_S, 185 C_WF_BITMAP_T, 186 C_WF_SYNC_UUID, 187 188 /* All SyncStates are tested with this comparison 189 * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */ 190 C_SYNC_SOURCE, 191 C_SYNC_TARGET, 192 C_VERIFY_S, 193 C_VERIFY_T, 194 C_PAUSED_SYNC_S, 195 C_PAUSED_SYNC_T, 196 C_MASK = 31 197}; 198 199enum drbd_disk_state { 200 D_DISKLESS, 201 D_ATTACHING, /* In the process of reading the meta-data */ 202 D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */ 203 /* when >= D_FAILED it is legal to access mdev->bc */ 204 D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */ 205 D_INCONSISTENT, 206 D_OUTDATED, 207 D_UNKNOWN, /* Only used for the peer, never for myself */ 208 D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */ 209 D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */ 210 D_MASK = 15 211}; 212 213union drbd_state { 214/* According to gcc's docs is the ... 215 * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1). 216 * Determined by ABI. 217 * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com> 218 * even though we transmit as "cpu_to_be32(state)", 219 * the offsets of the bitfields still need to be swapped 220 * on different endianess. 221 */ 222 struct { 223#if defined(__LITTLE_ENDIAN_BITFIELD) 224 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 225 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 226 unsigned conn:5 ; /* 17/32 cstates */ 227 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 228 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 229 unsigned susp:1 ; /* 2/2 IO suspended no/yes */ 230 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 231 unsigned peer_isp:1 ; 232 unsigned user_isp:1 ; 233 unsigned _pad:11; /* 0 unused */ 234#elif defined(__BIG_ENDIAN_BITFIELD) 235 unsigned _pad:11; /* 0 unused */ 236 unsigned user_isp:1 ; 237 unsigned peer_isp:1 ; 238 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ 239 unsigned susp:1 ; /* 2/2 IO suspended no/yes */ 240 unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 241 unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */ 242 unsigned conn:5 ; /* 17/32 cstates */ 243 unsigned peer:2 ; /* 3/4 primary/secondary/unknown */ 244 unsigned role:2 ; /* 3/4 primary/secondary/unknown */ 245#else 246# error "this endianess is not supported" 247#endif 248 }; 249 unsigned int i; 250}; 251 252enum drbd_state_ret_codes { 253 SS_CW_NO_NEED = 4, 254 SS_CW_SUCCESS = 3, 255 SS_NOTHING_TO_DO = 2, 256 SS_SUCCESS = 1, 257 SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */ 258 SS_TWO_PRIMARIES = -1, 259 SS_NO_UP_TO_DATE_DISK = -2, 260 SS_NO_LOCAL_DISK = -4, 261 SS_NO_REMOTE_DISK = -5, 262 SS_CONNECTED_OUTDATES = -6, 263 SS_PRIMARY_NOP = -7, 264 SS_RESYNC_RUNNING = -8, 265 SS_ALREADY_STANDALONE = -9, 266 SS_CW_FAILED_BY_PEER = -10, 267 SS_IS_DISKLESS = -11, 268 SS_DEVICE_IN_USE = -12, 269 SS_NO_NET_CONFIG = -13, 270 SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */ 271 SS_NEED_CONNECTION = -15, /* drbd-8.2 only */ 272 SS_LOWER_THAN_OUTDATED = -16, 273 SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */ 274 SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */ 275 SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */ 276 SS_AFTER_LAST_ERROR = -20, /* Keep this at bottom */ 277}; 278 279/* from drbd_strings.c */ 280extern const char *drbd_conn_str(enum drbd_conns); 281extern const char *drbd_role_str(enum drbd_role); 282extern const char *drbd_disk_str(enum drbd_disk_state); 283extern const char *drbd_set_st_err_str(enum drbd_state_ret_codes); 284 285#define SHARED_SECRET_MAX 64 286 287#define MDF_CONSISTENT (1 << 0) 288#define MDF_PRIMARY_IND (1 << 1) 289#define MDF_CONNECTED_IND (1 << 2) 290#define MDF_FULL_SYNC (1 << 3) 291#define MDF_WAS_UP_TO_DATE (1 << 4) 292#define MDF_PEER_OUT_DATED (1 << 5) 293#define MDF_CRASHED_PRIMARY (1 << 6) 294 295enum drbd_uuid_index { 296 UI_CURRENT, 297 UI_BITMAP, 298 UI_HISTORY_START, 299 UI_HISTORY_END, 300 UI_SIZE, /* nl-packet: number of dirty bits */ 301 UI_FLAGS, /* nl-packet: flags */ 302 UI_EXTENDED_SIZE /* Everything. */ 303}; 304 305enum drbd_timeout_flag { 306 UT_DEFAULT = 0, 307 UT_DEGRADED = 1, 308 UT_PEER_OUTDATED = 2, 309}; 310 311#define UUID_JUST_CREATED ((__u64)4) 312 313#define DRBD_MAGIC 0x83740267 314#define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC) 315 316/* these are of type "int" */ 317#define DRBD_MD_INDEX_INTERNAL -1 318#define DRBD_MD_INDEX_FLEX_EXT -2 319#define DRBD_MD_INDEX_FLEX_INT -3 320 321/* Start of the new netlink/connector stuff */ 322 323#define DRBD_NL_CREATE_DEVICE 0x01 324#define DRBD_NL_SET_DEFAULTS 0x02 325 326 327/* For searching a vacant cn_idx value */ 328#define CN_IDX_STEP 6977 329 330struct drbd_nl_cfg_req { 331 int packet_type; 332 unsigned int drbd_minor; 333 int flags; 334 unsigned short tag_list[]; 335}; 336 337struct drbd_nl_cfg_reply { 338 int packet_type; 339 unsigned int minor; 340 int ret_code; /* enum ret_code or set_st_err_t */ 341 unsigned short tag_list[]; /* only used with get_* calls */ 342}; 343 344#endif 345