linux/include/linux/drbd.h
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   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
  55extern const char *drbd_buildtag(void);
  56#define REL_VERSION "8.3.13"
  57#define API_VERSION 88
  58#define PRO_VERSION_MIN 86
  59#define PRO_VERSION_MAX 96
  60
  61
  62enum drbd_io_error_p {
  63        EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
  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
  94enum drbd_on_no_data {
  95        OND_IO_ERROR,
  96        OND_SUSPEND_IO
  97};
  98
  99enum 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. */
 106enum 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_TOO_SMALL      = 111,
 116        ERR_MD_DISK_TOO_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
 167enum 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 */
 179enum 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,  /* starting 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
 218enum 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
 232union 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 endianness.
 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 endianness is not supported"
 270#endif
 271        };
 272        unsigned int i;
 273};
 274
 275enum 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 */
 303extern const char *drbd_conn_str(enum drbd_conns);
 304extern const char *drbd_role_str(enum drbd_role);
 305extern const char *drbd_disk_str(enum drbd_disk_state);
 306extern 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
 318enum 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
 328enum 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
 355struct drbd_nl_cfg_req {
 356        int packet_type;
 357        unsigned int drbd_minor;
 358        int flags;
 359        unsigned short tag_list[];
 360};
 361
 362struct 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
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