The DRBD driver

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 349 insertions, 0 deletions

diff --git a/include/linux/drbd.h b/include/linux/drbd.h
new file mode 100644
index 000000000000..69dc711f37b3
--- /dev/null
+++ b/include/linux/drbd.h
@@ -0,0 +1,349 @@
+/*
+  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 "8.3.3rc2"
+#define API_VERSION 88
+#define PRO_VERSION_MIN 86
+#define PRO_VERSION_MAX 91
+
+
+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 */
+
+        /* 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
+
+/* The following line should be moved over to linux/connector.h
+ * when the time comes */
+#ifndef CN_IDX_DRBD
+# define CN_IDX_DRBD                    0x4
+/* Ubuntu "intrepid ibex" release defined CN_IDX_DRBD as 0x6 */
+#endif
+#define CN_VAL_DRBD                     0x1
+
+/* 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