include/linux/drbd.h

   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 extern const char *drbd_buildtag(void);
  55 #define REL_VERSION "8.3.11"
  56 #define API_VERSION 88
  57 #define PRO_VERSION_MIN 86
  58 #define PRO_VERSION_MAX 100
  59
  60
  61 enum drbd_io_error_p {
  62         EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
  63         EP_CALL_HELPER,
  64         EP_DETACH
  65 };
  66
  67 enum drbd_fencing_p {
  68         FP_NOT_AVAIL = -1, /* Not a policy */
  69         FP_DONT_CARE = 0,
  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_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_RESYNC_AFTER        = 132,
 134         ERR_RESYNC_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         ERR_RES_NOT_KNOWN       = 158,
 159         ERR_RES_IN_USE          = 159,
 160         ERR_MINOR_CONFIGURED    = 160,
 161         ERR_MINOR_EXISTS        = 161,
 162         ERR_INVALID_REQUEST     = 162,
 163         ERR_NEED_APV_100        = 163,
 164         ERR_NEED_ALLOW_TWO_PRI  = 164,
 165         ERR_MD_UNCLEAN          = 165,
 166
 167         /* insert new ones above this line */
 168         AFTER_LAST_ERR_CODE
 169 };
 170
 171 #define DRBD_PROT_A   1
 172 #define DRBD_PROT_B   2
 173 #define DRBD_PROT_C   3
 174
 175 enum drbd_role {
 176         R_UNKNOWN = 0,
 177         R_PRIMARY = 1,     /* role */
 178         R_SECONDARY = 2,   /* role */
 179         R_MASK = 3,
 180 };
 181
 182 /* The order of these constants is important.
 183  * The lower ones (<C_WF_REPORT_PARAMS) indicate
 184  * that there is no socket!
 185  * >=C_WF_REPORT_PARAMS ==> There is a socket
 186  */
 187 enum drbd_conns {
 188         C_STANDALONE,
 189         C_DISCONNECTING,  /* Temporal state on the way to StandAlone. */
 190         C_UNCONNECTED,    /* >= C_UNCONNECTED -> inc_net() succeeds */
 191
 192         /* These temporal states are all used on the way
 193          * from >= C_CONNECTED to Unconnected.
 194          * The 'disconnect reason' states
 195          * I do not allow to change between them. */
 196         C_TIMEOUT,
 197         C_BROKEN_PIPE,
 198         C_NETWORK_FAILURE,
 199         C_PROTOCOL_ERROR,
 200         C_TEAR_DOWN,
 201
 202         C_WF_CONNECTION,
 203         C_WF_REPORT_PARAMS, /* we have a socket */
 204         C_CONNECTED,      /* we have introduced each other */
 205         C_STARTING_SYNC_S,  /* starting full sync by admin request. */
 206         C_STARTING_SYNC_T,  /* starting full sync by admin request. */
 207         C_WF_BITMAP_S,
 208         C_WF_BITMAP_T,
 209         C_WF_SYNC_UUID,
 210
 211         /* All SyncStates are tested with this comparison
 212          * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
 213         C_SYNC_SOURCE,
 214         C_SYNC_TARGET,
 215         C_VERIFY_S,
 216         C_VERIFY_T,
 217         C_PAUSED_SYNC_S,
 218         C_PAUSED_SYNC_T,
 219
 220         C_AHEAD,
 221         C_BEHIND,
 222
 223         C_MASK = 31
 224 };
 225
 226 enum drbd_disk_state {
 227         D_DISKLESS,
 228         D_ATTACHING,      /* In the process of reading the meta-data */
 229         D_FAILED,         /* Becomes D_DISKLESS as soon as we told it the peer */
 230                         /* when >= D_FAILED it is legal to access mdev->bc */
 231         D_NEGOTIATING,    /* Late attaching state, we need to talk to the peer */
 232         D_INCONSISTENT,
 233         D_OUTDATED,
 234         D_UNKNOWN,       /* Only used for the peer, never for myself */
 235         D_CONSISTENT,     /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
 236         D_UP_TO_DATE,       /* Only this disk state allows applications' IO ! */
 237         D_MASK = 15
 238 };
 239
 240 union drbd_state {
 241 /* According to gcc's docs is the ...
 242  * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
 243  * Determined by ABI.
 244  * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
 245  * even though we transmit as "cpu_to_be32(state)",
 246  * the offsets of the bitfields still need to be swapped
 247  * on different endianness.
 248  */
 249         struct {
 250 #if defined(__LITTLE_ENDIAN_BITFIELD)
 251                 unsigned role:2 ;   /* 3/4       primary/secondary/unknown */
 252                 unsigned peer:2 ;   /* 3/4       primary/secondary/unknown */
 253                 unsigned conn:5 ;   /* 17/32     cstates */
 254                 unsigned disk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 255                 unsigned pdsk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 256                 unsigned susp:1 ;   /* 2/2       IO suspended no/yes (by user) */
 257                 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
 258                 unsigned peer_isp:1 ;
 259                 unsigned user_isp:1 ;
 260                 unsigned susp_nod:1 ; /* IO suspended because no data */
 261                 unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/
 262                 unsigned _pad:9;   /* 0  unused */
 263 #elif defined(__BIG_ENDIAN_BITFIELD)
 264                 unsigned _pad:9;
 265                 unsigned susp_fen:1 ;
 266                 unsigned susp_nod:1 ;
 267                 unsigned user_isp:1 ;
 268                 unsigned peer_isp:1 ;
 269                 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
 270                 unsigned susp:1 ;   /* 2/2       IO suspended  no/yes */
 271                 unsigned pdsk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 272                 unsigned disk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 273                 unsigned conn:5 ;   /* 17/32     cstates */
 274                 unsigned peer:2 ;   /* 3/4       primary/secondary/unknown */
 275                 unsigned role:2 ;   /* 3/4       primary/secondary/unknown */
 276 #else
 277 # error "this endianness is not supported"
 278 #endif
 279         };
 280         unsigned int i;
 281 };
 282
 283 enum drbd_state_rv {
 284         SS_CW_NO_NEED = 4,
 285         SS_CW_SUCCESS = 3,
 286         SS_NOTHING_TO_DO = 2,
 287         SS_SUCCESS = 1,
 288         SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
 289         SS_TWO_PRIMARIES = -1,
 290         SS_NO_UP_TO_DATE_DISK = -2,
 291         SS_NO_LOCAL_DISK = -4,
 292         SS_NO_REMOTE_DISK = -5,
 293         SS_CONNECTED_OUTDATES = -6,
 294         SS_PRIMARY_NOP = -7,
 295         SS_RESYNC_RUNNING = -8,
 296         SS_ALREADY_STANDALONE = -9,
 297         SS_CW_FAILED_BY_PEER = -10,
 298         SS_IS_DISKLESS = -11,
 299         SS_DEVICE_IN_USE = -12,
 300         SS_NO_NET_CONFIG = -13,
 301         SS_NO_VERIFY_ALG = -14,       /* drbd-8.2 only */
 302         SS_NEED_CONNECTION = -15,    /* drbd-8.2 only */
 303         SS_LOWER_THAN_OUTDATED = -16,
 304         SS_NOT_SUPPORTED = -17,      /* drbd-8.2 only */
 305         SS_IN_TRANSIENT_STATE = -18,  /* Retry after the next state change */
 306         SS_CONCURRENT_ST_CHG = -19,   /* Concurrent cluster side state change! */
 307         SS_O_VOL_PEER_PRI = -20,
 308         SS_AFTER_LAST_ERROR = -21,    /* Keep this at bottom */
 309 };
 310
 311 /* from drbd_strings.c */
 312 extern const char *drbd_conn_str(enum drbd_conns);
 313 extern const char *drbd_role_str(enum drbd_role);
 314 extern const char *drbd_disk_str(enum drbd_disk_state);
 315 extern const char *drbd_set_st_err_str(enum drbd_state_rv);
 316
 317 #define SHARED_SECRET_MAX 64
 318
 319 #define MDF_CONSISTENT          (1 << 0)
 320 #define MDF_PRIMARY_IND         (1 << 1)
 321 #define MDF_CONNECTED_IND       (1 << 2)
 322 #define MDF_FULL_SYNC           (1 << 3)
 323 #define MDF_WAS_UP_TO_DATE      (1 << 4)
 324 #define MDF_PEER_OUT_DATED      (1 << 5)
 325 #define MDF_CRASHED_PRIMARY     (1 << 6)
 326 #define MDF_AL_CLEAN            (1 << 7)
 327
 328 enum drbd_uuid_index {
 329         UI_CURRENT,
 330         UI_BITMAP,
 331         UI_HISTORY_START,
 332         UI_HISTORY_END,
 333         UI_SIZE,      /* nl-packet: number of dirty bits */
 334         UI_FLAGS,     /* nl-packet: flags */
 335         UI_EXTENDED_SIZE   /* Everything. */
 336 };
 337
 338 enum drbd_timeout_flag {
 339         UT_DEFAULT      = 0,
 340         UT_DEGRADED     = 1,
 341         UT_PEER_OUTDATED = 2,
 342 };
 343
 344 #define UUID_JUST_CREATED ((__u64)4)
 345
 346 /* magic numbers used in meta data and network packets */
 347 #define DRBD_MAGIC 0x83740267
 348 #define DRBD_MAGIC_BIG 0x835a
 349 #define DRBD_MAGIC_100 0x8620ec20
 350
 351 #define DRBD_MD_MAGIC_07   (DRBD_MAGIC+3)
 352 #define DRBD_MD_MAGIC_08   (DRBD_MAGIC+4)
 353 #define DRBD_MD_MAGIC_84_UNCLEAN        (DRBD_MAGIC+5)
 354
 355
 356 /* how I came up with this magic?
 357  * base64 decode "actlog==" ;) */
 358 #define DRBD_AL_MAGIC 0x69cb65a2
 359
 360 /* these are of type "int" */
 361 #define DRBD_MD_INDEX_INTERNAL -1
 362 #define DRBD_MD_INDEX_FLEX_EXT -2
 363 #define DRBD_MD_INDEX_FLEX_INT -3
 364
 365 #endif