cregit-Linux how code gets into the kernel

Release 4.12 include/linux/drbd.h

Directory: include/linux
/*
  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 <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 "8.4.7"

#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

Overall Contributors

PersonTokensPropCommitsCommitProp
Philipp Reisner97988.84%2354.76%
Andreas Gruenbacher595.35%921.43%
Lars Ellenberg353.18%716.67%
Fabian Frederick242.18%12.38%
Bart Van Assche40.36%12.38%
Lucas De Marchi10.09%12.38%
Total1102100.00%42100.00%
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