412 lines
11 KiB
C
412 lines
11 KiB
C
/*
|
|
drbd.h
|
|
Kernel module for 2.6.x Kernels
|
|
|
|
This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
|
|
|
|
Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
|
|
Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>.
|
|
Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
|
|
|
|
drbd is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
drbd is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with drbd; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
#ifndef DRBD_H
|
|
#define DRBD_H
|
|
#include <asm/types.h>
|
|
|
|
#ifdef __KERNEL__
|
|
#include <linux/types.h>
|
|
#include <asm/byteorder.h>
|
|
#else
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <limits.h>
|
|
|
|
/* Although the Linux source code makes a difference between
|
|
generic endianness and the bitfields' endianness, there is no
|
|
architecture as of Linux-2.6.24-rc4 where the bitfields' endianness
|
|
does not match the generic endianness. */
|
|
|
|
#if __BYTE_ORDER == __LITTLE_ENDIAN
|
|
#define __LITTLE_ENDIAN_BITFIELD
|
|
#elif __BYTE_ORDER == __BIG_ENDIAN
|
|
#define __BIG_ENDIAN_BITFIELD
|
|
#else
|
|
# error "sorry, weird endianness on this box"
|
|
#endif
|
|
|
|
#endif
|
|
|
|
extern const char *drbd_buildtag(void);
|
|
#define REL_VERSION "8.4.10"
|
|
#define API_VERSION 1
|
|
#define PRO_VERSION_MIN 86
|
|
#define PRO_VERSION_MAX 101
|
|
|
|
|
|
enum drbd_io_error_p {
|
|
EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
|
|
EP_CALL_HELPER,
|
|
EP_DETACH
|
|
};
|
|
|
|
enum drbd_fencing_p {
|
|
FP_NOT_AVAIL = -1, /* Not a policy */
|
|
FP_DONT_CARE = 0,
|
|
FP_RESOURCE,
|
|
FP_STONITH
|
|
};
|
|
|
|
enum drbd_disconnect_p {
|
|
DP_RECONNECT,
|
|
DP_DROP_NET_CONF,
|
|
DP_FREEZE_IO
|
|
};
|
|
|
|
enum drbd_after_sb_p {
|
|
ASB_DISCONNECT,
|
|
ASB_DISCARD_YOUNGER_PRI,
|
|
ASB_DISCARD_OLDER_PRI,
|
|
ASB_DISCARD_ZERO_CHG,
|
|
ASB_DISCARD_LEAST_CHG,
|
|
ASB_DISCARD_LOCAL,
|
|
ASB_DISCARD_REMOTE,
|
|
ASB_CONSENSUS,
|
|
ASB_DISCARD_SECONDARY,
|
|
ASB_CALL_HELPER,
|
|
ASB_VIOLENTLY
|
|
};
|
|
|
|
enum drbd_on_no_data {
|
|
OND_IO_ERROR,
|
|
OND_SUSPEND_IO
|
|
};
|
|
|
|
enum drbd_on_congestion {
|
|
OC_BLOCK,
|
|
OC_PULL_AHEAD,
|
|
OC_DISCONNECT,
|
|
};
|
|
|
|
enum drbd_read_balancing {
|
|
RB_PREFER_LOCAL,
|
|
RB_PREFER_REMOTE,
|
|
RB_ROUND_ROBIN,
|
|
RB_LEAST_PENDING,
|
|
RB_CONGESTED_REMOTE,
|
|
RB_32K_STRIPING,
|
|
RB_64K_STRIPING,
|
|
RB_128K_STRIPING,
|
|
RB_256K_STRIPING,
|
|
RB_512K_STRIPING,
|
|
RB_1M_STRIPING,
|
|
};
|
|
|
|
/* KEEP the order, do not delete or insert. Only append. */
|
|
enum drbd_ret_code {
|
|
ERR_CODE_BASE = 100,
|
|
NO_ERROR = 101,
|
|
ERR_LOCAL_ADDR = 102,
|
|
ERR_PEER_ADDR = 103,
|
|
ERR_OPEN_DISK = 104,
|
|
ERR_OPEN_MD_DISK = 105,
|
|
ERR_DISK_NOT_BDEV = 107,
|
|
ERR_MD_NOT_BDEV = 108,
|
|
ERR_DISK_TOO_SMALL = 111,
|
|
ERR_MD_DISK_TOO_SMALL = 112,
|
|
ERR_BDCLAIM_DISK = 114,
|
|
ERR_BDCLAIM_MD_DISK = 115,
|
|
ERR_MD_IDX_INVALID = 116,
|
|
ERR_IO_MD_DISK = 118,
|
|
ERR_MD_INVALID = 119,
|
|
ERR_AUTH_ALG = 120,
|
|
ERR_AUTH_ALG_ND = 121,
|
|
ERR_NOMEM = 122,
|
|
ERR_DISCARD_IMPOSSIBLE = 123,
|
|
ERR_DISK_CONFIGURED = 124,
|
|
ERR_NET_CONFIGURED = 125,
|
|
ERR_MANDATORY_TAG = 126,
|
|
ERR_MINOR_INVALID = 127,
|
|
ERR_INTR = 129, /* EINTR */
|
|
ERR_RESIZE_RESYNC = 130,
|
|
ERR_NO_PRIMARY = 131,
|
|
ERR_RESYNC_AFTER = 132,
|
|
ERR_RESYNC_AFTER_CYCLE = 133,
|
|
ERR_PAUSE_IS_SET = 134,
|
|
ERR_PAUSE_IS_CLEAR = 135,
|
|
ERR_PACKET_NR = 137,
|
|
ERR_NO_DISK = 138,
|
|
ERR_NOT_PROTO_C = 139,
|
|
ERR_NOMEM_BITMAP = 140,
|
|
ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */
|
|
ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */
|
|
ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */
|
|
ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */
|
|
ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */
|
|
ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */
|
|
ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */
|
|
ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */
|
|
ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */
|
|
ERR_DATA_NOT_CURRENT = 150,
|
|
ERR_CONNECTED = 151, /* DRBD 8.3 only */
|
|
ERR_PERM = 152,
|
|
ERR_NEED_APV_93 = 153,
|
|
ERR_STONITH_AND_PROT_A = 154,
|
|
ERR_CONG_NOT_PROTO_A = 155,
|
|
ERR_PIC_AFTER_DEP = 156,
|
|
ERR_PIC_PEER_DEP = 157,
|
|
ERR_RES_NOT_KNOWN = 158,
|
|
ERR_RES_IN_USE = 159,
|
|
ERR_MINOR_CONFIGURED = 160,
|
|
ERR_MINOR_OR_VOLUME_EXISTS = 161,
|
|
ERR_INVALID_REQUEST = 162,
|
|
ERR_NEED_APV_100 = 163,
|
|
ERR_NEED_ALLOW_TWO_PRI = 164,
|
|
ERR_MD_UNCLEAN = 165,
|
|
ERR_MD_LAYOUT_CONNECTED = 166,
|
|
ERR_MD_LAYOUT_TOO_BIG = 167,
|
|
ERR_MD_LAYOUT_TOO_SMALL = 168,
|
|
ERR_MD_LAYOUT_NO_FIT = 169,
|
|
ERR_IMPLICIT_SHRINK = 170,
|
|
/* insert new ones above this line */
|
|
AFTER_LAST_ERR_CODE
|
|
};
|
|
|
|
#define DRBD_PROT_A 1
|
|
#define DRBD_PROT_B 2
|
|
#define DRBD_PROT_C 3
|
|
|
|
enum drbd_role {
|
|
R_UNKNOWN = 0,
|
|
R_PRIMARY = 1, /* role */
|
|
R_SECONDARY = 2, /* role */
|
|
R_MASK = 3,
|
|
};
|
|
|
|
/* The order of these constants is important.
|
|
* The lower ones (<C_WF_REPORT_PARAMS) indicate
|
|
* that there is no socket!
|
|
* >=C_WF_REPORT_PARAMS ==> There is a socket
|
|
*/
|
|
enum drbd_conns {
|
|
C_STANDALONE,
|
|
C_DISCONNECTING, /* Temporal state on the way to StandAlone. */
|
|
C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */
|
|
|
|
/* These temporal states are all used on the way
|
|
* from >= C_CONNECTED to Unconnected.
|
|
* The 'disconnect reason' states
|
|
* I do not allow to change between them. */
|
|
C_TIMEOUT,
|
|
C_BROKEN_PIPE,
|
|
C_NETWORK_FAILURE,
|
|
C_PROTOCOL_ERROR,
|
|
C_TEAR_DOWN,
|
|
|
|
C_WF_CONNECTION,
|
|
C_WF_REPORT_PARAMS, /* we have a socket */
|
|
C_CONNECTED, /* we have introduced each other */
|
|
C_STARTING_SYNC_S, /* starting full sync by admin request. */
|
|
C_STARTING_SYNC_T, /* starting full sync by admin request. */
|
|
C_WF_BITMAP_S,
|
|
C_WF_BITMAP_T,
|
|
C_WF_SYNC_UUID,
|
|
|
|
/* All SyncStates are tested with this comparison
|
|
* xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
|
|
C_SYNC_SOURCE,
|
|
C_SYNC_TARGET,
|
|
C_VERIFY_S,
|
|
C_VERIFY_T,
|
|
C_PAUSED_SYNC_S,
|
|
C_PAUSED_SYNC_T,
|
|
|
|
C_AHEAD,
|
|
C_BEHIND,
|
|
|
|
C_MASK = 31
|
|
};
|
|
|
|
enum drbd_disk_state {
|
|
D_DISKLESS,
|
|
D_ATTACHING, /* In the process of reading the meta-data */
|
|
D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */
|
|
/* when >= D_FAILED it is legal to access mdev->ldev */
|
|
D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */
|
|
D_INCONSISTENT,
|
|
D_OUTDATED,
|
|
D_UNKNOWN, /* Only used for the peer, never for myself */
|
|
D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
|
|
D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */
|
|
D_MASK = 15
|
|
};
|
|
|
|
union drbd_state {
|
|
/* According to gcc's docs is the ...
|
|
* The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
|
|
* Determined by ABI.
|
|
* pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
|
|
* even though we transmit as "cpu_to_be32(state)",
|
|
* the offsets of the bitfields still need to be swapped
|
|
* on different endianness.
|
|
*/
|
|
struct {
|
|
#if defined(__LITTLE_ENDIAN_BITFIELD)
|
|
unsigned role:2 ; /* 3/4 primary/secondary/unknown */
|
|
unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
|
|
unsigned conn:5 ; /* 17/32 cstates */
|
|
unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
|
|
unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
|
|
unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */
|
|
unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
|
|
unsigned peer_isp:1 ;
|
|
unsigned user_isp:1 ;
|
|
unsigned susp_nod:1 ; /* IO suspended because no data */
|
|
unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/
|
|
unsigned _pad:9; /* 0 unused */
|
|
#elif defined(__BIG_ENDIAN_BITFIELD)
|
|
unsigned _pad:9;
|
|
unsigned susp_fen:1 ;
|
|
unsigned susp_nod:1 ;
|
|
unsigned user_isp:1 ;
|
|
unsigned peer_isp:1 ;
|
|
unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
|
|
unsigned susp:1 ; /* 2/2 IO suspended no/yes */
|
|
unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
|
|
unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
|
|
unsigned conn:5 ; /* 17/32 cstates */
|
|
unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
|
|
unsigned role:2 ; /* 3/4 primary/secondary/unknown */
|
|
#else
|
|
# error "this endianness is not supported"
|
|
#endif
|
|
};
|
|
unsigned int i;
|
|
};
|
|
|
|
enum drbd_state_rv {
|
|
SS_CW_NO_NEED = 4,
|
|
SS_CW_SUCCESS = 3,
|
|
SS_NOTHING_TO_DO = 2,
|
|
SS_SUCCESS = 1,
|
|
SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
|
|
SS_TWO_PRIMARIES = -1,
|
|
SS_NO_UP_TO_DATE_DISK = -2,
|
|
SS_NO_LOCAL_DISK = -4,
|
|
SS_NO_REMOTE_DISK = -5,
|
|
SS_CONNECTED_OUTDATES = -6,
|
|
SS_PRIMARY_NOP = -7,
|
|
SS_RESYNC_RUNNING = -8,
|
|
SS_ALREADY_STANDALONE = -9,
|
|
SS_CW_FAILED_BY_PEER = -10,
|
|
SS_IS_DISKLESS = -11,
|
|
SS_DEVICE_IN_USE = -12,
|
|
SS_NO_NET_CONFIG = -13,
|
|
SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */
|
|
SS_NEED_CONNECTION = -15, /* drbd-8.2 only */
|
|
SS_LOWER_THAN_OUTDATED = -16,
|
|
SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */
|
|
SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */
|
|
SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */
|
|
SS_O_VOL_PEER_PRI = -20,
|
|
SS_OUTDATE_WO_CONN = -21,
|
|
SS_AFTER_LAST_ERROR = -22, /* Keep this at bottom */
|
|
};
|
|
|
|
#define SHARED_SECRET_MAX 64
|
|
|
|
#define MDF_CONSISTENT (1 << 0)
|
|
#define MDF_PRIMARY_IND (1 << 1)
|
|
#define MDF_CONNECTED_IND (1 << 2)
|
|
#define MDF_FULL_SYNC (1 << 3)
|
|
#define MDF_WAS_UP_TO_DATE (1 << 4)
|
|
#define MDF_PEER_OUT_DATED (1 << 5)
|
|
#define MDF_CRASHED_PRIMARY (1 << 6)
|
|
#define MDF_AL_CLEAN (1 << 7)
|
|
#define MDF_AL_DISABLED (1 << 8)
|
|
|
|
#define MAX_PEERS 32
|
|
|
|
enum drbd_uuid_index {
|
|
UI_CURRENT,
|
|
UI_BITMAP,
|
|
UI_HISTORY_START,
|
|
UI_HISTORY_END,
|
|
UI_SIZE, /* nl-packet: number of dirty bits */
|
|
UI_FLAGS, /* nl-packet: flags */
|
|
UI_EXTENDED_SIZE /* Everything. */
|
|
};
|
|
|
|
#define HISTORY_UUIDS MAX_PEERS
|
|
|
|
enum drbd_timeout_flag {
|
|
UT_DEFAULT = 0,
|
|
UT_DEGRADED = 1,
|
|
UT_PEER_OUTDATED = 2,
|
|
};
|
|
|
|
enum drbd_notification_type {
|
|
NOTIFY_EXISTS,
|
|
NOTIFY_CREATE,
|
|
NOTIFY_CHANGE,
|
|
NOTIFY_DESTROY,
|
|
NOTIFY_CALL,
|
|
NOTIFY_RESPONSE,
|
|
|
|
NOTIFY_CONTINUES = 0x8000,
|
|
NOTIFY_FLAGS = NOTIFY_CONTINUES,
|
|
};
|
|
|
|
enum drbd_peer_state {
|
|
P_INCONSISTENT = 3,
|
|
P_OUTDATED = 4,
|
|
P_DOWN = 5,
|
|
P_PRIMARY = 6,
|
|
P_FENCING = 7,
|
|
};
|
|
|
|
#define UUID_JUST_CREATED ((__u64)4)
|
|
|
|
enum write_ordering_e {
|
|
WO_NONE,
|
|
WO_DRAIN_IO,
|
|
WO_BDEV_FLUSH,
|
|
WO_BIO_BARRIER
|
|
};
|
|
|
|
/* magic numbers used in meta data and network packets */
|
|
#define DRBD_MAGIC 0x83740267
|
|
#define DRBD_MAGIC_BIG 0x835a
|
|
#define DRBD_MAGIC_100 0x8620ec20
|
|
|
|
#define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3)
|
|
#define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
|
|
#define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
|
|
|
|
|
|
/* how I came up with this magic?
|
|
* base64 decode "actlog==" ;) */
|
|
#define DRBD_AL_MAGIC 0x69cb65a2
|
|
|
|
/* these are of type "int" */
|
|
#define DRBD_MD_INDEX_INTERNAL -1
|
|
#define DRBD_MD_INDEX_FLEX_EXT -2
|
|
#define DRBD_MD_INDEX_FLEX_INT -3
|
|
|
|
#define DRBD_CPU_MASK_SIZE 32
|
|
|
|
#endif
|