370 lines
10 KiB
C
370 lines
10 KiB
C
/*
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drbd.h
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Kernel module for 2.6.x Kernels
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This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
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Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
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Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>.
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Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
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drbd is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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drbd is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with drbd; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef DRBD_H
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#define DRBD_H
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#include <linux/connector.h>
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#include <asm/types.h>
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#else
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <limits.h>
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/* Although the Linux source code makes a difference between
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generic endianness and the bitfields' endianness, there is no
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architecture as of Linux-2.6.24-rc4 where the bitfields' endianness
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does not match the generic endianness. */
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define __LITTLE_ENDIAN_BITFIELD
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#elif __BYTE_ORDER == __BIG_ENDIAN
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#define __BIG_ENDIAN_BITFIELD
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#else
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# error "sorry, weird endianness on this box"
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#endif
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#endif
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extern const char *drbd_buildtag(void);
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#define REL_VERSION "8.3.11"
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#define API_VERSION 88
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#define PRO_VERSION_MIN 86
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#define PRO_VERSION_MAX 96
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enum drbd_io_error_p {
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EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
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EP_CALL_HELPER,
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EP_DETACH
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};
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enum drbd_fencing_p {
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FP_DONT_CARE,
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FP_RESOURCE,
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FP_STONITH
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};
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enum drbd_disconnect_p {
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DP_RECONNECT,
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DP_DROP_NET_CONF,
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DP_FREEZE_IO
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};
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enum drbd_after_sb_p {
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ASB_DISCONNECT,
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ASB_DISCARD_YOUNGER_PRI,
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ASB_DISCARD_OLDER_PRI,
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ASB_DISCARD_ZERO_CHG,
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ASB_DISCARD_LEAST_CHG,
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ASB_DISCARD_LOCAL,
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ASB_DISCARD_REMOTE,
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ASB_CONSENSUS,
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ASB_DISCARD_SECONDARY,
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ASB_CALL_HELPER,
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ASB_VIOLENTLY
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};
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enum drbd_on_no_data {
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OND_IO_ERROR,
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OND_SUSPEND_IO
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};
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enum drbd_on_congestion {
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OC_BLOCK,
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OC_PULL_AHEAD,
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OC_DISCONNECT,
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};
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/* KEEP the order, do not delete or insert. Only append. */
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enum drbd_ret_code {
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ERR_CODE_BASE = 100,
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NO_ERROR = 101,
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ERR_LOCAL_ADDR = 102,
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ERR_PEER_ADDR = 103,
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ERR_OPEN_DISK = 104,
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ERR_OPEN_MD_DISK = 105,
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ERR_DISK_NOT_BDEV = 107,
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ERR_MD_NOT_BDEV = 108,
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ERR_DISK_TO_SMALL = 111,
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ERR_MD_DISK_TO_SMALL = 112,
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ERR_BDCLAIM_DISK = 114,
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ERR_BDCLAIM_MD_DISK = 115,
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ERR_MD_IDX_INVALID = 116,
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ERR_IO_MD_DISK = 118,
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ERR_MD_INVALID = 119,
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ERR_AUTH_ALG = 120,
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ERR_AUTH_ALG_ND = 121,
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ERR_NOMEM = 122,
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ERR_DISCARD = 123,
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ERR_DISK_CONFIGURED = 124,
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ERR_NET_CONFIGURED = 125,
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ERR_MANDATORY_TAG = 126,
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ERR_MINOR_INVALID = 127,
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ERR_INTR = 129, /* EINTR */
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ERR_RESIZE_RESYNC = 130,
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ERR_NO_PRIMARY = 131,
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ERR_SYNC_AFTER = 132,
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ERR_SYNC_AFTER_CYCLE = 133,
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ERR_PAUSE_IS_SET = 134,
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ERR_PAUSE_IS_CLEAR = 135,
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ERR_PACKET_NR = 137,
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ERR_NO_DISK = 138,
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ERR_NOT_PROTO_C = 139,
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ERR_NOMEM_BITMAP = 140,
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ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */
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ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */
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ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */
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ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */
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ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */
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ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */
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ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */
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ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */
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ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */
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ERR_DATA_NOT_CURRENT = 150,
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ERR_CONNECTED = 151, /* DRBD 8.3 only */
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ERR_PERM = 152,
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ERR_NEED_APV_93 = 153,
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ERR_STONITH_AND_PROT_A = 154,
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ERR_CONG_NOT_PROTO_A = 155,
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ERR_PIC_AFTER_DEP = 156,
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ERR_PIC_PEER_DEP = 157,
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/* insert new ones above this line */
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AFTER_LAST_ERR_CODE
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};
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#define DRBD_PROT_A 1
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#define DRBD_PROT_B 2
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#define DRBD_PROT_C 3
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enum drbd_role {
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R_UNKNOWN = 0,
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R_PRIMARY = 1, /* role */
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R_SECONDARY = 2, /* role */
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R_MASK = 3,
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};
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/* The order of these constants is important.
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* The lower ones (<C_WF_REPORT_PARAMS) indicate
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* that there is no socket!
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* >=C_WF_REPORT_PARAMS ==> There is a socket
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*/
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enum drbd_conns {
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C_STANDALONE,
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C_DISCONNECTING, /* Temporal state on the way to StandAlone. */
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C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */
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/* These temporal states are all used on the way
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* from >= C_CONNECTED to Unconnected.
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* The 'disconnect reason' states
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* I do not allow to change between them. */
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C_TIMEOUT,
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C_BROKEN_PIPE,
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C_NETWORK_FAILURE,
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C_PROTOCOL_ERROR,
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C_TEAR_DOWN,
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C_WF_CONNECTION,
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C_WF_REPORT_PARAMS, /* we have a socket */
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C_CONNECTED, /* we have introduced each other */
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C_STARTING_SYNC_S, /* starting full sync by admin request. */
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C_STARTING_SYNC_T, /* starting full sync by admin request. */
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C_WF_BITMAP_S,
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C_WF_BITMAP_T,
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C_WF_SYNC_UUID,
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/* All SyncStates are tested with this comparison
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* xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
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C_SYNC_SOURCE,
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C_SYNC_TARGET,
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C_VERIFY_S,
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C_VERIFY_T,
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C_PAUSED_SYNC_S,
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C_PAUSED_SYNC_T,
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C_AHEAD,
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C_BEHIND,
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C_MASK = 31
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};
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enum drbd_disk_state {
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D_DISKLESS,
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D_ATTACHING, /* In the process of reading the meta-data */
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D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */
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/* when >= D_FAILED it is legal to access mdev->bc */
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D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */
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D_INCONSISTENT,
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D_OUTDATED,
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D_UNKNOWN, /* Only used for the peer, never for myself */
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D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
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D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */
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D_MASK = 15
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};
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union drbd_state {
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/* According to gcc's docs is the ...
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* The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
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* Determined by ABI.
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* pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
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* even though we transmit as "cpu_to_be32(state)",
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* the offsets of the bitfields still need to be swapped
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* on different endianness.
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*/
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struct {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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unsigned role:2 ; /* 3/4 primary/secondary/unknown */
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unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
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unsigned conn:5 ; /* 17/32 cstates */
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unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */
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unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
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unsigned peer_isp:1 ;
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unsigned user_isp:1 ;
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unsigned susp_nod:1 ; /* IO suspended because no data */
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unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/
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unsigned _pad:9; /* 0 unused */
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#elif defined(__BIG_ENDIAN_BITFIELD)
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unsigned _pad:9;
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unsigned susp_fen:1 ;
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unsigned susp_nod:1 ;
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unsigned user_isp:1 ;
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unsigned peer_isp:1 ;
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unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
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unsigned susp:1 ; /* 2/2 IO suspended no/yes */
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unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
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unsigned conn:5 ; /* 17/32 cstates */
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unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
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unsigned role:2 ; /* 3/4 primary/secondary/unknown */
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#else
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# error "this endianness is not supported"
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#endif
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};
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unsigned int i;
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};
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enum drbd_state_rv {
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SS_CW_NO_NEED = 4,
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SS_CW_SUCCESS = 3,
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SS_NOTHING_TO_DO = 2,
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SS_SUCCESS = 1,
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SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
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SS_TWO_PRIMARIES = -1,
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SS_NO_UP_TO_DATE_DISK = -2,
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SS_NO_LOCAL_DISK = -4,
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SS_NO_REMOTE_DISK = -5,
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SS_CONNECTED_OUTDATES = -6,
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SS_PRIMARY_NOP = -7,
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SS_RESYNC_RUNNING = -8,
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SS_ALREADY_STANDALONE = -9,
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SS_CW_FAILED_BY_PEER = -10,
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SS_IS_DISKLESS = -11,
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SS_DEVICE_IN_USE = -12,
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SS_NO_NET_CONFIG = -13,
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SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */
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SS_NEED_CONNECTION = -15, /* drbd-8.2 only */
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SS_LOWER_THAN_OUTDATED = -16,
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SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */
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SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */
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SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */
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SS_AFTER_LAST_ERROR = -20, /* Keep this at bottom */
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};
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/* from drbd_strings.c */
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extern const char *drbd_conn_str(enum drbd_conns);
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extern const char *drbd_role_str(enum drbd_role);
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extern const char *drbd_disk_str(enum drbd_disk_state);
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extern const char *drbd_set_st_err_str(enum drbd_state_rv);
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#define SHARED_SECRET_MAX 64
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#define MDF_CONSISTENT (1 << 0)
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#define MDF_PRIMARY_IND (1 << 1)
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#define MDF_CONNECTED_IND (1 << 2)
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#define MDF_FULL_SYNC (1 << 3)
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#define MDF_WAS_UP_TO_DATE (1 << 4)
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#define MDF_PEER_OUT_DATED (1 << 5)
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#define MDF_CRASHED_PRIMARY (1 << 6)
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enum drbd_uuid_index {
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UI_CURRENT,
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UI_BITMAP,
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UI_HISTORY_START,
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UI_HISTORY_END,
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UI_SIZE, /* nl-packet: number of dirty bits */
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UI_FLAGS, /* nl-packet: flags */
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UI_EXTENDED_SIZE /* Everything. */
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};
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enum drbd_timeout_flag {
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UT_DEFAULT = 0,
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UT_DEGRADED = 1,
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UT_PEER_OUTDATED = 2,
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};
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#define UUID_JUST_CREATED ((__u64)4)
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#define DRBD_MAGIC 0x83740267
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#define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC)
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#define DRBD_MAGIC_BIG 0x835a
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#define BE_DRBD_MAGIC_BIG __constant_cpu_to_be16(DRBD_MAGIC_BIG)
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/* these are of type "int" */
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#define DRBD_MD_INDEX_INTERNAL -1
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#define DRBD_MD_INDEX_FLEX_EXT -2
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#define DRBD_MD_INDEX_FLEX_INT -3
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/* Start of the new netlink/connector stuff */
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#define DRBD_NL_CREATE_DEVICE 0x01
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#define DRBD_NL_SET_DEFAULTS 0x02
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/* For searching a vacant cn_idx value */
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#define CN_IDX_STEP 6977
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struct drbd_nl_cfg_req {
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int packet_type;
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unsigned int drbd_minor;
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int flags;
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unsigned short tag_list[];
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};
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struct drbd_nl_cfg_reply {
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int packet_type;
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unsigned int minor;
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int ret_code; /* enum ret_code or set_st_err_t */
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unsigned short tag_list[]; /* only used with get_* calls */
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};
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#endif
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