| /* |
| 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 <linux/connector.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> |
| |
| /* Altough 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 bitfileds' 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 "8.3.8" |
| #define API_VERSION 88 |
| #define PRO_VERSION_MIN 86 |
| #define PRO_VERSION_MAX 94 |
| |
| |
| 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_DONT_CARE, |
| 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 |
| }; |
| |
| /* KEEP the order, do not delete or insert. Only append. */ |
| enum drbd_ret_codes { |
| 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_TO_SMALL = 111, |
| ERR_MD_DISK_TO_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 = 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_SYNC_AFTER = 132, |
| ERR_SYNC_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, |
| |
| /* 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 beween 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, /* stariing 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_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->bc */ |
| 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 endianess. |
| */ |
| 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 */ |
| unsigned aftr_isp:1 ; /* isp .. imposed sync pause */ |
| unsigned peer_isp:1 ; |
| unsigned user_isp:1 ; |
| unsigned _pad:11; /* 0 unused */ |
| #elif defined(__BIG_ENDIAN_BITFIELD) |
| unsigned _pad:11; /* 0 unused */ |
| 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 endianess is not supported" |
| #endif |
| }; |
| unsigned int i; |
| }; |
| |
| enum drbd_state_ret_codes { |
| 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_AFTER_LAST_ERROR = -20, /* Keep this at bottom */ |
| }; |
| |
| /* from drbd_strings.c */ |
| extern const char *drbd_conn_str(enum drbd_conns); |
| extern const char *drbd_role_str(enum drbd_role); |
| extern const char *drbd_disk_str(enum drbd_disk_state); |
| extern const char *drbd_set_st_err_str(enum drbd_state_ret_codes); |
| |
| #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) |
| |
| 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. */ |
| }; |
| |
| enum drbd_timeout_flag { |
| UT_DEFAULT = 0, |
| UT_DEGRADED = 1, |
| UT_PEER_OUTDATED = 2, |
| }; |
| |
| #define UUID_JUST_CREATED ((__u64)4) |
| |
| #define DRBD_MAGIC 0x83740267 |
| #define BE_DRBD_MAGIC __constant_cpu_to_be32(DRBD_MAGIC) |
| |
| /* 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 |
| |
| /* Start of the new netlink/connector stuff */ |
| |
| #define DRBD_NL_CREATE_DEVICE 0x01 |
| #define DRBD_NL_SET_DEFAULTS 0x02 |
| |
| |
| /* For searching a vacant cn_idx value */ |
| #define CN_IDX_STEP 6977 |
| |
| struct drbd_nl_cfg_req { |
| int packet_type; |
| unsigned int drbd_minor; |
| int flags; |
| unsigned short tag_list[]; |
| }; |
| |
| struct drbd_nl_cfg_reply { |
| int packet_type; |
| unsigned int minor; |
| int ret_code; /* enum ret_code or set_st_err_t */ |
| unsigned short tag_list[]; /* only used with get_* calls */ |
| }; |
| |
| #endif |