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

/*
  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>

/* 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 "8.3.11"
#define API_VERSION 88
#define PRO_VERSION_MIN 86
#define PRO_VERSION_MAX 100


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,
};

/* 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		= 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_EXISTS	= 161,
	ERR_INVALID_REQUEST	= 162,
	ERR_NEED_APV_100	= 163,
	ERR_NEED_ALLOW_TWO_PRI  = 164,
	ERR_MD_UNCLEAN          = 165,

	/* 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->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 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_AFTER_LAST_ERROR = -21,    /* 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_rv);

#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)

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)

/* 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

#endif
Commit	Line	Data
b411b363 PR	1	/*
	2	drbd.h
	3	Kernel module for 2.6.x Kernels
	4
	5	This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
	6
	7	Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
	8	Copyright (C) 2001-2008, Philipp Reisner <philipp.reisner@linbit.com>.
	9	Copyright (C) 2001-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
	10
	11	drbd is free software; you can redistribute it and/or modify
	12	it under the terms of the GNU General Public License as published by
	13	the Free Software Foundation; either version 2, or (at your option)
	14	any later version.
	15
	16	drbd is distributed in the hope that it will be useful,
	17	but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	GNU General Public License for more details.
	20
	21	You should have received a copy of the GNU General Public License
	22	along with drbd; see the file COPYING. If not, write to
	23	the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
	24
	25	*/
	26	#ifndef DRBD_H
	27	#define DRBD_H
	28	#include <linux/connector.h>
	29	#include <asm/types.h>
	30
	31	#ifdef __KERNEL__
	32	#include <linux/types.h>
	33	#include <asm/byteorder.h>
	34	#else
	35	#include <sys/types.h>
	36	#include <sys/wait.h>
	37	#include <limits.h>
	38
25985edc	39	/* Although the Linux source code makes a difference between
b411b363	40	generic endianness and the bitfields' endianness, there is no
24c4830c	41	architecture as of Linux-2.6.24-rc4 where the bitfields' endianness
b411b363 PR	42	does not match the generic endianness. */
	43
	44	#if __BYTE_ORDER == __LITTLE_ENDIAN
	45	#define __LITTLE_ENDIAN_BITFIELD
	46	#elif __BYTE_ORDER == __BIG_ENDIAN
	47	#define __BIG_ENDIAN_BITFIELD
	48	#else
	49	# error "sorry, weird endianness on this box"
	50	#endif
	51
	52	#endif
	53
b411b363	54	extern const char *drbd_buildtag(void);
9a0d9d03	55	#define REL_VERSION "8.3.11"
b411b363 PR	56	#define API_VERSION 88
b411b363 PR	57	#define PRO_VERSION_MIN 86
fd340c12	58	#define PRO_VERSION_MAX 100
b411b363 PR	59
	60
	61	enum drbd_io_error_p {
	62	EP_PASS_ON, /* FIXME should the better be named "Ignore"? */
	63	EP_CALL_HELPER,
	64	EP_DETACH
	65	};
	66
	67	enum drbd_fencing_p {
cb703454 PR	68	FP_NOT_AVAIL = -1, /* Not a policy */
cb703454 PR	69	FP_DONT_CARE = 0,
b411b363 PR	70	FP_RESOURCE,
	71	FP_STONITH
	72	};
	73
	74	enum drbd_disconnect_p {
	75	DP_RECONNECT,
	76	DP_DROP_NET_CONF,
	77	DP_FREEZE_IO
	78	};
	79
	80	enum drbd_after_sb_p {
	81	ASB_DISCONNECT,
	82	ASB_DISCARD_YOUNGER_PRI,
	83	ASB_DISCARD_OLDER_PRI,
	84	ASB_DISCARD_ZERO_CHG,
	85	ASB_DISCARD_LEAST_CHG,
	86	ASB_DISCARD_LOCAL,
	87	ASB_DISCARD_REMOTE,
	88	ASB_CONSENSUS,
	89	ASB_DISCARD_SECONDARY,
	90	ASB_CALL_HELPER,
	91	ASB_VIOLENTLY
	92	};
	93
265be2d0 PR	94	enum drbd_on_no_data {
	95	OND_IO_ERROR,
	96	OND_SUSPEND_IO
	97	};
	98
422028b1 PR	99	enum drbd_on_congestion {
	100	OC_BLOCK,
	101	OC_PULL_AHEAD,
	102	OC_DISCONNECT,
	103	};
	104
380207d0 PR	105	enum drbd_read_balancing {
	106	RB_PREFER_LOCAL,
	107	RB_PREFER_REMOTE,
	108	RB_ROUND_ROBIN,
	109	RB_LEAST_PENDING,
	110	RB_CONGESTED_REMOTE,
	111	};
	112
b411b363	113	/* KEEP the order, do not delete or insert. Only append. */
116676ca	114	enum drbd_ret_code {
b411b363 PR	115	ERR_CODE_BASE = 100,
	116	NO_ERROR = 101,
	117	ERR_LOCAL_ADDR = 102,
	118	ERR_PEER_ADDR = 103,
	119	ERR_OPEN_DISK = 104,
	120	ERR_OPEN_MD_DISK = 105,
	121	ERR_DISK_NOT_BDEV = 107,
	122	ERR_MD_NOT_BDEV = 108,
67b58bf7 LE	123	ERR_DISK_TOO_SMALL = 111,
67b58bf7 LE	124	ERR_MD_DISK_TOO_SMALL = 112,
b411b363 PR	125	ERR_BDCLAIM_DISK = 114,
	126	ERR_BDCLAIM_MD_DISK = 115,
	127	ERR_MD_IDX_INVALID = 116,
	128	ERR_IO_MD_DISK = 118,
	129	ERR_MD_INVALID = 119,
	130	ERR_AUTH_ALG = 120,
	131	ERR_AUTH_ALG_ND = 121,
	132	ERR_NOMEM = 122,
	133	ERR_DISCARD = 123,
	134	ERR_DISK_CONFIGURED = 124,
	135	ERR_NET_CONFIGURED = 125,
	136	ERR_MANDATORY_TAG = 126,
	137	ERR_MINOR_INVALID = 127,
	138	ERR_INTR = 129, /* EINTR */
	139	ERR_RESIZE_RESYNC = 130,
	140	ERR_NO_PRIMARY = 131,
95f8efd0 AG	141	ERR_RESYNC_AFTER = 132,
95f8efd0 AG	142	ERR_RESYNC_AFTER_CYCLE = 133,
b411b363 PR	143	ERR_PAUSE_IS_SET = 134,
	144	ERR_PAUSE_IS_CLEAR = 135,
	145	ERR_PACKET_NR = 137,
	146	ERR_NO_DISK = 138,
	147	ERR_NOT_PROTO_C = 139,
	148	ERR_NOMEM_BITMAP = 140,
	149	ERR_INTEGRITY_ALG = 141, /* DRBD 8.2 only */
	150	ERR_INTEGRITY_ALG_ND = 142, /* DRBD 8.2 only */
	151	ERR_CPU_MASK_PARSE = 143, /* DRBD 8.2 only */
	152	ERR_CSUMS_ALG = 144, /* DRBD 8.2 only */
	153	ERR_CSUMS_ALG_ND = 145, /* DRBD 8.2 only */
	154	ERR_VERIFY_ALG = 146, /* DRBD 8.2 only */
	155	ERR_VERIFY_ALG_ND = 147, /* DRBD 8.2 only */
	156	ERR_CSUMS_RESYNC_RUNNING= 148, /* DRBD 8.2 only */
	157	ERR_VERIFY_RUNNING = 149, /* DRBD 8.2 only */
	158	ERR_DATA_NOT_CURRENT = 150,
	159	ERR_CONNECTED = 151, /* DRBD 8.3 only */
9f5180e5	160	ERR_PERM = 152,
6495d2c6	161	ERR_NEED_APV_93 = 153,
47ff2d0a	162	ERR_STONITH_AND_PROT_A = 154,
422028b1	163	ERR_CONG_NOT_PROTO_A = 155,
cd88d030 PR	164	ERR_PIC_AFTER_DEP = 156,
cd88d030 PR	165	ERR_PIC_PEER_DEP = 157,
789c1b62 AG	166	ERR_RES_NOT_KNOWN = 158,
789c1b62 AG	167	ERR_RES_IN_USE = 159,
774b3055 PR	168	ERR_MINOR_CONFIGURED = 160,
774b3055 PR	169	ERR_MINOR_EXISTS = 161,
3b98c0c2	170	ERR_INVALID_REQUEST = 162,
b032b6fa	171	ERR_NEED_APV_100 = 163,
dcb20d1a	172	ERR_NEED_ALLOW_TWO_PRI = 164,
d5d7ebd4	173	ERR_MD_UNCLEAN = 165,
b411b363 PR	174
	175	/* insert new ones above this line */
	176	AFTER_LAST_ERR_CODE
	177	};
	178
	179	#define DRBD_PROT_A 1
	180	#define DRBD_PROT_B 2
	181	#define DRBD_PROT_C 3
	182
	183	enum drbd_role {
	184	R_UNKNOWN = 0,
	185	R_PRIMARY = 1, /* role */
	186	R_SECONDARY = 2, /* role */
	187	R_MASK = 3,
	188	};
	189
	190	/* The order of these constants is important.
	191	* The lower ones (<C_WF_REPORT_PARAMS) indicate
	192	* that there is no socket!
	193	* >=C_WF_REPORT_PARAMS ==> There is a socket
	194	*/
	195	enum drbd_conns {
	196	C_STANDALONE,
	197	C_DISCONNECTING, /* Temporal state on the way to StandAlone. */
	198	C_UNCONNECTED, /* >= C_UNCONNECTED -> inc_net() succeeds */
	199
	200	/* These temporal states are all used on the way
	201	* from >= C_CONNECTED to Unconnected.
	202	* The 'disconnect reason' states
25985edc	203	* I do not allow to change between them. */
b411b363 PR	204	C_TIMEOUT,
	205	C_BROKEN_PIPE,
	206	C_NETWORK_FAILURE,
	207	C_PROTOCOL_ERROR,
	208	C_TEAR_DOWN,
	209
	210	C_WF_CONNECTION,
	211	C_WF_REPORT_PARAMS, /* we have a socket */
	212	C_CONNECTED, /* we have introduced each other */
	213	C_STARTING_SYNC_S, /* starting full sync by admin request. */
24c4830c	214	C_STARTING_SYNC_T, /* starting full sync by admin request. */
b411b363 PR	215	C_WF_BITMAP_S,
	216	C_WF_BITMAP_T,
	217	C_WF_SYNC_UUID,
	218
	219	/* All SyncStates are tested with this comparison
	220	* xx >= C_SYNC_SOURCE && xx <= C_PAUSED_SYNC_T */
	221	C_SYNC_SOURCE,
	222	C_SYNC_TARGET,
	223	C_VERIFY_S,
	224	C_VERIFY_T,
	225	C_PAUSED_SYNC_S,
	226	C_PAUSED_SYNC_T,
67531718 PR	227
	228	C_AHEAD,
	229	C_BEHIND,
	230
b411b363 PR	231	C_MASK = 31
	232	};
	233
	234	enum drbd_disk_state {
	235	D_DISKLESS,
	236	D_ATTACHING, /* In the process of reading the meta-data */
	237	D_FAILED, /* Becomes D_DISKLESS as soon as we told it the peer */
	238	/* when >= D_FAILED it is legal to access mdev->bc */
	239	D_NEGOTIATING, /* Late attaching state, we need to talk to the peer */
	240	D_INCONSISTENT,
	241	D_OUTDATED,
	242	D_UNKNOWN, /* Only used for the peer, never for myself */
	243	D_CONSISTENT, /* Might be D_OUTDATED, might be D_UP_TO_DATE ... */
	244	D_UP_TO_DATE, /* Only this disk state allows applications' IO ! */
	245	D_MASK = 15
	246	};
	247
	248	union drbd_state {
	249	/* According to gcc's docs is the ...
	250	* The order of allocation of bit-fields within a unit (C90 6.5.2.1, C99 6.7.2.1).
	251	* Determined by ABI.
	252	* pointed out by Maxim Uvarov q<muvarov@ru.mvista.com>
	253	* even though we transmit as "cpu_to_be32(state)",
	254	* the offsets of the bitfields still need to be swapped
24c4830c	255	* on different endianness.
b411b363 PR	256	*/
	257	struct {
	258	#if defined(__LITTLE_ENDIAN_BITFIELD)
	259	unsigned role:2 ; /* 3/4 primary/secondary/unknown */
	260	unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
	261	unsigned conn:5 ; /* 17/32 cstates */
	262	unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
	263	unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
fb22c402	264	unsigned susp:1 ; /* 2/2 IO suspended no/yes (by user) */
b411b363 PR	265	unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
	266	unsigned peer_isp:1 ;
	267	unsigned user_isp:1 ;
fb22c402 PR	268	unsigned susp_nod:1 ; /* IO suspended because no data */
	269	unsigned susp_fen:1 ; /* IO suspended because fence peer handler runs*/
	270	unsigned _pad:9; /* 0 unused */
b411b363	271	#elif defined(__BIG_ENDIAN_BITFIELD)
fb22c402 PR	272	unsigned _pad:9;
	273	unsigned susp_fen:1 ;
	274	unsigned susp_nod:1 ;
b411b363 PR	275	unsigned user_isp:1 ;
	276	unsigned peer_isp:1 ;
	277	unsigned aftr_isp:1 ; /* isp .. imposed sync pause */
	278	unsigned susp:1 ; /* 2/2 IO suspended no/yes */
	279	unsigned pdsk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
	280	unsigned disk:4 ; /* 8/16 from D_DISKLESS to D_UP_TO_DATE */
	281	unsigned conn:5 ; /* 17/32 cstates */
	282	unsigned peer:2 ; /* 3/4 primary/secondary/unknown */
	283	unsigned role:2 ; /* 3/4 primary/secondary/unknown */
	284	#else
24c4830c	285	# error "this endianness is not supported"
b411b363 PR	286	#endif
	287	};
	288	unsigned int i;
	289	};
	290
c8b32563	291	enum drbd_state_rv {
b411b363 PR	292	SS_CW_NO_NEED = 4,
	293	SS_CW_SUCCESS = 3,
	294	SS_NOTHING_TO_DO = 2,
	295	SS_SUCCESS = 1,
	296	SS_UNKNOWN_ERROR = 0, /* Used to sleep longer in _drbd_request_state */
	297	SS_TWO_PRIMARIES = -1,
	298	SS_NO_UP_TO_DATE_DISK = -2,
	299	SS_NO_LOCAL_DISK = -4,
	300	SS_NO_REMOTE_DISK = -5,
	301	SS_CONNECTED_OUTDATES = -6,
	302	SS_PRIMARY_NOP = -7,
	303	SS_RESYNC_RUNNING = -8,
	304	SS_ALREADY_STANDALONE = -9,
	305	SS_CW_FAILED_BY_PEER = -10,
	306	SS_IS_DISKLESS = -11,
	307	SS_DEVICE_IN_USE = -12,
	308	SS_NO_NET_CONFIG = -13,
	309	SS_NO_VERIFY_ALG = -14, /* drbd-8.2 only */
	310	SS_NEED_CONNECTION = -15, /* drbd-8.2 only */
	311	SS_LOWER_THAN_OUTDATED = -16,
	312	SS_NOT_SUPPORTED = -17, /* drbd-8.2 only */
	313	SS_IN_TRANSIENT_STATE = -18, /* Retry after the next state change */
	314	SS_CONCURRENT_ST_CHG = -19, /* Concurrent cluster side state change! */
047e95e2 PR	315	SS_O_VOL_PEER_PRI = -20,
047e95e2 PR	316	SS_AFTER_LAST_ERROR = -21, /* Keep this at bottom */
b411b363 PR	317	};
	318
	319	/* from drbd_strings.c */
	320	extern const char *drbd_conn_str(enum drbd_conns);
	321	extern const char *drbd_role_str(enum drbd_role);
	322	extern const char *drbd_disk_str(enum drbd_disk_state);
c8b32563	323	extern const char *drbd_set_st_err_str(enum drbd_state_rv);
b411b363 PR	324
	325	#define SHARED_SECRET_MAX 64
	326
	327	#define MDF_CONSISTENT (1 << 0)
	328	#define MDF_PRIMARY_IND (1 << 1)
	329	#define MDF_CONNECTED_IND (1 << 2)
	330	#define MDF_FULL_SYNC (1 << 3)
	331	#define MDF_WAS_UP_TO_DATE (1 << 4)
	332	#define MDF_PEER_OUT_DATED (1 << 5)
d5d7ebd4 LE	333	#define MDF_CRASHED_PRIMARY (1 << 6)
d5d7ebd4 LE	334	#define MDF_AL_CLEAN (1 << 7)
b411b363 PR	335
	336	enum drbd_uuid_index {
	337	UI_CURRENT,
	338	UI_BITMAP,
	339	UI_HISTORY_START,
	340	UI_HISTORY_END,
	341	UI_SIZE, /* nl-packet: number of dirty bits */
	342	UI_FLAGS, /* nl-packet: flags */
	343	UI_EXTENDED_SIZE /* Everything. */
	344	};
	345
	346	enum drbd_timeout_flag {
	347	UT_DEFAULT = 0,
	348	UT_DEGRADED = 1,
	349	UT_PEER_OUTDATED = 2,
	350	};
	351
	352	#define UUID_JUST_CREATED ((__u64)4)
	353
d5d7ebd4	354	/* magic numbers used in meta data and network packets */
b411b363	355	#define DRBD_MAGIC 0x83740267
0b70a13d	356	#define DRBD_MAGIC_BIG 0x835a
0c8e36d9	357	#define DRBD_MAGIC_100 0x8620ec20
b411b363	358
d5d7ebd4 LE	359	#define DRBD_MD_MAGIC_07 (DRBD_MAGIC+3)
	360	#define DRBD_MD_MAGIC_08 (DRBD_MAGIC+4)
	361	#define DRBD_MD_MAGIC_84_UNCLEAN (DRBD_MAGIC+5)
	362
	363
7ad651b5 LE	364	/* how I came up with this magic?
	365	* base64 decode "actlog==" ;) */
	366	#define DRBD_AL_MAGIC 0x69cb65a2
	367
b411b363 PR	368	/* these are of type "int" */
	369	#define DRBD_MD_INDEX_INTERNAL -1
	370	#define DRBD_MD_INDEX_FLEX_EXT -2
	371	#define DRBD_MD_INDEX_FLEX_INT -3
	372
b411b363	373	#endif