| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| 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>. |
| |
| |
| */ |
| #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 "8.4.11" |
| #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 |