[linux.git] / include / linux / drbd.h

/* 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 <[email protected]>.
  Copyright (C) 2001-2008, Lars Ellenberg <[email protected]>.


*/
#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

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<[email protected]>
 * 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
Commit	Line	Data
c6ae4c04	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
b411b363 PR	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 <[email protected]>.
	10	Copyright (C) 2001-2008, Lars Ellenberg <[email protected]>.
	11
b411b363 PR	12
	13	*/
	14	#ifndef DRBD_H
	15	#define DRBD_H
b411b363 PR	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
25985edc	26	/* Although the Linux source code makes a difference between
b411b363	27	generic endianness and the bitfields' endianness, there is no
24c4830c	28	architecture as of Linux-2.6.24-rc4 where the bitfields' endianness
b411b363 PR	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
b411b363 PR	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 {
cb703454 PR	48	FP_NOT_AVAIL = -1, /* Not a policy */
cb703454 PR	49	FP_DONT_CARE = 0,
b411b363 PR	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
265be2d0 PR	74	enum drbd_on_no_data {
	75	OND_IO_ERROR,
	76	OND_SUSPEND_IO
	77	};
	78
422028b1 PR	79	enum drbd_on_congestion {
	80	OC_BLOCK,
	81	OC_PULL_AHEAD,
	82	OC_DISCONNECT,
	83	};
	84
380207d0 PR	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,
d60de03a PR	91	RB_32K_STRIPING,
	92	RB_64K_STRIPING,
	93	RB_128K_STRIPING,
	94	RB_256K_STRIPING,
	95	RB_512K_STRIPING,
	96	RB_1M_STRIPING,
380207d0 PR	97	};
380207d0 PR	98
b411b363	99	/* KEEP the order, do not delete or insert. Only append. */
116676ca	100	enum drbd_ret_code {
b411b363 PR	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,
67b58bf7 LE	109	ERR_DISK_TOO_SMALL = 111,
67b58bf7 LE	110	ERR_MD_DISK_TOO_SMALL = 112,
b411b363 PR	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,
eb12010e	119	ERR_DISCARD_IMPOSSIBLE = 123,
b411b363 PR	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,
95f8efd0 AG	127	ERR_RESYNC_AFTER = 132,
95f8efd0 AG	128	ERR_RESYNC_AFTER_CYCLE = 133,
b411b363 PR	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 */
9f5180e5	146	ERR_PERM = 152,
6495d2c6	147	ERR_NEED_APV_93 = 153,
47ff2d0a	148	ERR_STONITH_AND_PROT_A = 154,
422028b1	149	ERR_CONG_NOT_PROTO_A = 155,
cd88d030 PR	150	ERR_PIC_AFTER_DEP = 156,
cd88d030 PR	151	ERR_PIC_PEER_DEP = 157,
789c1b62 AG	152	ERR_RES_NOT_KNOWN = 158,
789c1b62 AG	153	ERR_RES_IN_USE = 159,
774b3055	154	ERR_MINOR_CONFIGURED = 160,
179e20b8	155	ERR_MINOR_OR_VOLUME_EXISTS = 161,
3b98c0c2	156	ERR_INVALID_REQUEST = 162,
b032b6fa	157	ERR_NEED_APV_100 = 163,
dcb20d1a	158	ERR_NEED_ALLOW_TWO_PRI = 164,
d5d7ebd4	159	ERR_MD_UNCLEAN = 165,
d752b269 PR	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,
b411b363 PR	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
25985edc	193	* I do not allow to change between them. */
b411b363 PR	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. */
24c4830c	204	C_STARTING_SYNC_T, /* starting full sync by admin request. */
b411b363 PR	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,
67531718 PR	217
	218	C_AHEAD,
	219	C_BEHIND,
	220
b411b363 PR	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 */
8fe39aac	228	/* when >= D_FAILED it is legal to access mdev->ldev */
b411b363 PR	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<[email protected]>
	243	* even though we transmit as "cpu_to_be32(state)",
	244	* the offsets of the bitfields still need to be swapped
24c4830c	245	* on different endianness.
b411b363 PR	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 */
fb22c402	254	unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */
b411b363 PR	255	unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
	256	unsigned peer_isp:1 ;
	257	unsigned user_isp:1 ;
fb22c402 PR	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 */
b411b363	261	#elif defined(__BIG_ENDIAN_BITFIELD)
fb22c402 PR	262	unsigned _pad:9;
	263	unsigned susp_fen:1 ;
	264	unsigned susp_nod:1 ;
b411b363 PR	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
24c4830c	275	# error "this endianness is not supported"
b411b363 PR	276	#endif
	277	};
	278	unsigned int i;
	279	};
	280
c8b32563	281	enum drbd_state_rv {
b411b363 PR	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! */
047e95e2	305	SS_O_VOL_PEER_PRI = -20,
2bd5ed5d PR	306	SS_OUTDATE_WO_CONN = -21,
2bd5ed5d PR	307	SS_AFTER_LAST_ERROR = -22, /* Keep this at bottom */
b411b363 PR	308	};
b411b363 PR	309
b411b363 PR	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)
d5d7ebd4 LE	318	#define MDF_CRASHED_PRIMARY (1 << 6)
d5d7ebd4 LE	319	#define MDF_AL_CLEAN (1 << 7)
9a51ab1c	320	#define MDF_AL_DISABLED (1 << 8)
b411b363	321
a2972846 AG	322	#define MAX_PEERS 32
a2972846 AG	323
b411b363 PR	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
a2972846 AG	334	#define HISTORY_UUIDS MAX_PEERS
a2972846 AG	335
b411b363 PR	336	enum drbd_timeout_flag {
	337	UT_DEFAULT = 0,
	338	UT_DEGRADED = 1,
	339	UT_PEER_OUTDATED = 2,
	340	};
	341
a2972846 AG	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
7e5fec31 FF	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
b411b363 PR	362	#define UUID_JUST_CREATED ((__u64)4)
b411b363 PR	363
f6ba8636 AG	364	enum write_ordering_e {
	365	WO_NONE,
	366	WO_DRAIN_IO,
	367	WO_BDEV_FLUSH,
	368	WO_BIO_BARRIER
	369	};
	370
d5d7ebd4	371	/* magic numbers used in meta data and network packets */
b411b363	372	#define DRBD_MAGIC 0x83740267
0b70a13d	373	#define DRBD_MAGIC_BIG 0x835a
0c8e36d9	374	#define DRBD_MAGIC_100 0x8620ec20
b411b363	375
d5d7ebd4 LE	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
7ad651b5 LE	381	/* how I came up with this magic?
	382	* base64 decode "actlog==" ;) */
	383	#define DRBD_AL_MAGIC 0x69cb65a2
	384
b411b363 PR	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
f44d0436 AG	390	#define DRBD_CPU_MASK_SIZE 32
f44d0436 AG	391
b411b363	392	#endif