include/linux/drbd.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3   drbd.h
   4   Kernel module for 2.6.x Kernels
   5
   6   This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
   7
   8   Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
   9   Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>.
  10   Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
  11
  12
  13 */
  14 #ifndef DRBD_H
  15 #define DRBD_H
  16 #include <asm/types.h>
  17
  18 #ifdef __KERNEL__
  19 #include <linux/types.h>
  20 #include <asm/byteorder.h>
  21 #else
  22 #include <sys/types.h>
  23 #include <sys/wait.h>
  24 #include <limits.h>
  25
  26 /* Although the Linux source code makes a difference between
  27    generic endianness and the bitfields' endianness, there is no
  28    architecture as of Linux-2.6.24-rc4 where the bitfields' endianness
  29    does not match the generic endianness. */
  30
  31 #if __BYTE_ORDER == __LITTLE_ENDIAN
  32 #define __LITTLE_ENDIAN_BITFIELD
  33 #elif __BYTE_ORDER == __BIG_ENDIAN
  34 #define __BIG_ENDIAN_BITFIELD
  35 #else
  36 # error "sorry, weird endianness on this box"
  37 #endif
  38
  39 #endif
  40
  41 enum drbd_io_error_p {
  42         EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
  43         EP_CALL_HELPER,
  44         EP_DETACH
  45 };
  46
  47 enum drbd_fencing_p {
  48         FP_NOT_AVAIL = -1, /* Not a policy */
  49         FP_DONT_CARE = 0,
  50         FP_RESOURCE,
  51         FP_STONITH
  52 };
  53
  54 enum drbd_disconnect_p {
  55         DP_RECONNECT,
  56         DP_DROP_NET_CONF,
  57         DP_FREEZE_IO
  58 };
  59
  60 enum drbd_after_sb_p {
  61         ASB_DISCONNECT,
  62         ASB_DISCARD_YOUNGER_PRI,
  63         ASB_DISCARD_OLDER_PRI,
  64         ASB_DISCARD_ZERO_CHG,
  65         ASB_DISCARD_LEAST_CHG,
  66         ASB_DISCARD_LOCAL,
  67         ASB_DISCARD_REMOTE,
  68         ASB_CONSENSUS,
  69         ASB_DISCARD_SECONDARY,
  70         ASB_CALL_HELPER,
  71         ASB_VIOLENTLY
  72 };
  73
  74 enum drbd_on_no_data {
  75         OND_IO_ERROR,
  76         OND_SUSPEND_IO
  77 };
  78
  79 enum drbd_on_congestion {
  80         OC_BLOCK,
  81         OC_PULL_AHEAD,
  82         OC_DISCONNECT,
  83 };
  84
  85 enum drbd_read_balancing {
  86         RB_PREFER_LOCAL,
  87         RB_PREFER_REMOTE,
  88         RB_ROUND_ROBIN,
  89         RB_LEAST_PENDING,
  90         RB_CONGESTED_REMOTE,
  91         RB_32K_STRIPING,
  92         RB_64K_STRIPING,
  93         RB_128K_STRIPING,
  94         RB_256K_STRIPING,
  95         RB_512K_STRIPING,
  96         RB_1M_STRIPING,
  97 };
  98
  99 /* KEEP the order, do not delete or insert. Only append. */
 100 enum drbd_ret_code {
 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_TOO_SMALL      = 111,
 110         ERR_MD_DISK_TOO_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_IMPOSSIBLE  = 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_RESYNC_AFTER        = 132,
 128         ERR_RESYNC_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         ERR_CONG_NOT_PROTO_A    = 155,
 150         ERR_PIC_AFTER_DEP       = 156,
 151         ERR_PIC_PEER_DEP        = 157,
 152         ERR_RES_NOT_KNOWN       = 158,
 153         ERR_RES_IN_USE          = 159,
 154         ERR_MINOR_CONFIGURED    = 160,
 155         ERR_MINOR_OR_VOLUME_EXISTS = 161,
 156         ERR_INVALID_REQUEST     = 162,
 157         ERR_NEED_APV_100        = 163,
 158         ERR_NEED_ALLOW_TWO_PRI  = 164,
 159         ERR_MD_UNCLEAN          = 165,
 160         ERR_MD_LAYOUT_CONNECTED = 166,
 161         ERR_MD_LAYOUT_TOO_BIG   = 167,
 162         ERR_MD_LAYOUT_TOO_SMALL = 168,
 163         ERR_MD_LAYOUT_NO_FIT    = 169,
 164         ERR_IMPLICIT_SHRINK     = 170,
 165         /* insert new ones above this line */
 166         AFTER_LAST_ERR_CODE
 167 };
 168
 169 #define DRBD_PROT_A   1
 170 #define DRBD_PROT_B   2
 171 #define DRBD_PROT_C   3
 172
 173 enum drbd_role {
 174         R_UNKNOWN = 0,
 175         R_PRIMARY = 1,     /* role */
 176         R_SECONDARY = 2,   /* role */
 177         R_MASK = 3,
 178 };
 179
 180 /* The order of these constants is important.
 181  * The lower ones (<C_WF_REPORT_PARAMS) indicate
 182  * that there is no socket!
 183  * >=C_WF_REPORT_PARAMS ==> There is a socket
 184  */
 185 enum drbd_conns {
 186         C_STANDALONE,
 187         C_DISCONNECTING,  /* Temporal state on the way to StandAlone. */
 188         C_UNCONNECTED,    /* >= C_UNCONNECTED -> inc_net() succeeds */
 189
 190         /* These temporal states are all used on the way
 191          * from >= C_CONNECTED to Unconnected.
 192          * The 'disconnect reason' states
 193          * I do not allow to change between them. */
 194         C_TIMEOUT,
 195         C_BROKEN_PIPE,
 196         C_NETWORK_FAILURE,
 197         C_PROTOCOL_ERROR,
 198         C_TEAR_DOWN,
 199
 200         C_WF_CONNECTION,
 201         C_WF_REPORT_PARAMS, /* we have a socket */
 202         C_CONNECTED,      /* we have introduced each other */
 203         C_STARTING_SYNC_S,  /* starting full sync by admin request. */
 204         C_STARTING_SYNC_T,  /* starting full sync by admin request. */
 205         C_WF_BITMAP_S,
 206         C_WF_BITMAP_T,
 207         C_WF_SYNC_UUID,
 208
 209         /* All SyncStates are tested with this comparison
 210          * xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
 211         C_SYNC_SOURCE,
 212         C_SYNC_TARGET,
 213         C_VERIFY_S,
 214         C_VERIFY_T,
 215         C_PAUSED_SYNC_S,
 216         C_PAUSED_SYNC_T,
 217
 218         C_AHEAD,
 219         C_BEHIND,
 220
 221         C_MASK = 31
 222 };
 223
 224 enum drbd_disk_state {
 225         D_DISKLESS,
 226         D_ATTACHING,      /* In the process of reading the meta-data */
 227         D_FAILED,         /* Becomes D_DISKLESS as soon as we told it the peer */
 228                           /* when >= D_FAILED it is legal to access mdev->ldev */
 229         D_NEGOTIATING,    /* Late attaching state, we need to talk to the peer */
 230         D_INCONSISTENT,
 231         D_OUTDATED,
 232         D_UNKNOWN,       /* Only used for the peer, never for myself */
 233         D_CONSISTENT,     /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
 234         D_UP_TO_DATE,       /* Only this disk state allows applications' IO ! */
 235         D_MASK = 15
 236 };
 237
 238 union drbd_state {
 239 /* According to gcc's docs is the ...
 240  * The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
 241  * Determined by ABI.
 242  * pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
 243  * even though we transmit as "cpu_to_be32(state)",
 244  * the offsets of the bitfields still need to be swapped
 245  * on different endianness.
 246  */
 247         struct {
 248 #if defined(__LITTLE_ENDIAN_BITFIELD)
 249                 unsigned role:2 ;   /* 3/4       primary/secondary/unknown */
 250                 unsigned peer:2 ;   /* 3/4       primary/secondary/unknown */
 251                 unsigned conn:5 ;   /* 17/32     cstates */
 252                 unsigned disk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 253                 unsigned pdsk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 254                 unsigned susp:1 ;   /* 2/2       IO suspended no/yes (by user) */
 255                 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
 256                 unsigned peer_isp:1 ;
 257                 unsigned user_isp:1 ;
 258                 unsigned susp_nod:1 ; /* IO suspended because no data */
 259                 unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/
 260                 unsigned _pad:9;   /* 0  unused */
 261 #elif defined(__BIG_ENDIAN_BITFIELD)
 262                 unsigned _pad:9;
 263                 unsigned susp_fen:1 ;
 264                 unsigned susp_nod:1 ;
 265                 unsigned user_isp:1 ;
 266                 unsigned peer_isp:1 ;
 267                 unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
 268                 unsigned susp:1 ;   /* 2/2       IO suspended  no/yes */
 269                 unsigned pdsk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 270                 unsigned disk:4 ;   /* 8/16      from D_DISKLESS to D_UP_TO_DATE */
 271                 unsigned conn:5 ;   /* 17/32     cstates */
 272                 unsigned peer:2 ;   /* 3/4       primary/secondary/unknown */
 273                 unsigned role:2 ;   /* 3/4       primary/secondary/unknown */
 274 #else
 275 # error "this endianness is not supported"
 276 #endif
 277         };
 278         unsigned int i;
 279 };
 280
 281 enum drbd_state_rv {
 282         SS_CW_NO_NEED = 4,
 283         SS_CW_SUCCESS = 3,
 284         SS_NOTHING_TO_DO = 2,
 285         SS_SUCCESS = 1,
 286         SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
 287         SS_TWO_PRIMARIES = -1,
 288         SS_NO_UP_TO_DATE_DISK = -2,
 289         SS_NO_LOCAL_DISK = -4,
 290         SS_NO_REMOTE_DISK = -5,
 291         SS_CONNECTED_OUTDATES = -6,
 292         SS_PRIMARY_NOP = -7,
 293         SS_RESYNC_RUNNING = -8,
 294         SS_ALREADY_STANDALONE = -9,
 295         SS_CW_FAILED_BY_PEER = -10,
 296         SS_IS_DISKLESS = -11,
 297         SS_DEVICE_IN_USE = -12,
 298         SS_NO_NET_CONFIG = -13,
 299         SS_NO_VERIFY_ALG = -14,       /* drbd-8.2 only */
 300         SS_NEED_CONNECTION = -15,    /* drbd-8.2 only */
 301         SS_LOWER_THAN_OUTDATED = -16,
 302         SS_NOT_SUPPORTED = -17,      /* drbd-8.2 only */
 303         SS_IN_TRANSIENT_STATE = -18,  /* Retry after the next state change */
 304         SS_CONCURRENT_ST_CHG = -19,   /* Concurrent cluster side state change! */
 305         SS_O_VOL_PEER_PRI = -20,
 306         SS_OUTDATE_WO_CONN = -21,
 307         SS_AFTER_LAST_ERROR = -22,    /* Keep this at bottom */
 308 };
 309
 310 #define SHARED_SECRET_MAX 64
 311
 312 #define MDF_CONSISTENT          (1 << 0)
 313 #define MDF_PRIMARY_IND         (1 << 1)
 314 #define MDF_CONNECTED_IND       (1 << 2)
 315 #define MDF_FULL_SYNC           (1 << 3)
 316 #define MDF_WAS_UP_TO_DATE      (1 << 4)
 317 #define MDF_PEER_OUT_DATED      (1 << 5)
 318 #define MDF_CRASHED_PRIMARY     (1 << 6)
 319 #define MDF_AL_CLEAN            (1 << 7)
 320 #define MDF_AL_DISABLED         (1 << 8)
 321
 322 #define MAX_PEERS 32
 323
 324 enum drbd_uuid_index {
 325         UI_CURRENT,
 326         UI_BITMAP,
 327         UI_HISTORY_START,
 328         UI_HISTORY_END,
 329         UI_SIZE,      /* nl-packet: number of dirty bits */
 330         UI_FLAGS,     /* nl-packet: flags */
 331         UI_EXTENDED_SIZE   /* Everything. */
 332 };
 333
 334 #define HISTORY_UUIDS MAX_PEERS
 335
 336 enum drbd_timeout_flag {
 337         UT_DEFAULT      = 0,
 338         UT_DEGRADED     = 1,
 339         UT_PEER_OUTDATED = 2,
 340 };
 341
 342 enum drbd_notification_type {
 343         NOTIFY_EXISTS,
 344         NOTIFY_CREATE,
 345         NOTIFY_CHANGE,
 346         NOTIFY_DESTROY,
 347         NOTIFY_CALL,
 348         NOTIFY_RESPONSE,
 349
 350         NOTIFY_CONTINUES = 0x8000,
 351         NOTIFY_FLAGS = NOTIFY_CONTINUES,
 352 };
 353
 354 enum drbd_peer_state {
 355         P_INCONSISTENT = 3,
 356         P_OUTDATED = 4,
 357         P_DOWN = 5,
 358         P_PRIMARY = 6,
 359         P_FENCING = 7,
 360 };
 361
 362 #define UUID_JUST_CREATED ((__u64)4)
 363
 364 enum write_ordering_e {
 365         WO_NONE,
 366         WO_DRAIN_IO,
 367         WO_BDEV_FLUSH,
 368         WO_BIO_BARRIER
 369 };
 370
 371 /* magic numbers used in meta data and network packets */
 372 #define DRBD_MAGIC 0x83740267
 373 #define DRBD_MAGIC_BIG 0x835a
 374 #define DRBD_MAGIC_100 0x8620ec20
 375
 376 #define DRBD_MD_MAGIC_07   (DRBD_MAGIC+3)
 377 #define DRBD_MD_MAGIC_08   (DRBD_MAGIC+4)
 378 #define DRBD_MD_MAGIC_84_UNCLEAN        (DRBD_MAGIC+5)
 379
 380
 381 /* how I came up with this magic?
 382  * base64 decode "actlog==" ;) */
 383 #define DRBD_AL_MAGIC 0x69cb65a2
 384
 385 /* these are of type "int" */
 386 #define DRBD_MD_INDEX_INTERNAL -1
 387 #define DRBD_MD_INDEX_FLEX_EXT -2
 388 #define DRBD_MD_INDEX_FLEX_INT -3
 389
 390 #define DRBD_CPU_MASK_SIZE 32
 391
 392 #endif