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    Subject[PATCH 06/16] drbd: user space interface (based upon connector/netlink)
    Date
    The packets are composed of extensible tag lists. That interface can be
    extended over time without breaking old userspace programs.

    The nice part of the interface to userspace: drbd.h. The ugly part is for
    sure drbd_tag_magic.h..

    I realize that macros are generally frowned upon, but this way it is easier
    to maintain. The code that gets generated by repeatedly including drbd_nl.h
    is hard to maintain over time if it is open coded. (BTW, did you know that
    the samba 4 people are proud to have more than 50% of their code auto
    generated:)

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

    ---
    diff --git a/include/linux/drbd.h b/include/linux/drbd.h
    new file mode 100644
    index 0000000..8f1e2b3
    --- /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 "8.3.2"
    +#define API_VERSION 88
    +#define PRO_VERSION_MIN 86
    +#define PRO_VERSION_MAX 90
    +
    +
    +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 *conns_to_name(enum drbd_conns);
    +extern const char *roles_to_name(enum drbd_role);
    +extern const char *disks_to_name(enum drbd_disk_state);
    +extern const char *set_st_err_name(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
    diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
    new file mode 100644
    index 0000000..9d067ce
    --- /dev/null
    +++ b/include/linux/drbd_limits.h
    @@ -0,0 +1,137 @@
    +/*
    + drbd_limits.h
    + This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
    +*/
    +
    +/*
    + * Our current limitations.
    + * Some of them are hard limits,
    + * some of them are arbitrary range limits, that make it easier to provide
    + * feedback about nonsense settings for certain configurable values.
    + */
    +
    +#ifndef DRBD_LIMITS_H
    +#define DRBD_LIMITS_H 1
    +
    +#define DEBUG_RANGE_CHECK 0
    +
    +#define DRBD_MINOR_COUNT_MIN 1
    +#define DRBD_MINOR_COUNT_MAX 255
    +
    +#define DRBD_DIALOG_REFRESH_MIN 0
    +#define DRBD_DIALOG_REFRESH_MAX 600
    +
    +/* valid port number */
    +#define DRBD_PORT_MIN 1
    +#define DRBD_PORT_MAX 0xffff
    +
    +/* startup { */
    + /* if you want more than 3.4 days, disable */
    +#define DRBD_WFC_TIMEOUT_MIN 0
    +#define DRBD_WFC_TIMEOUT_MAX 300000
    +#define DRBD_WFC_TIMEOUT_DEF 0
    +
    +#define DRBD_DEGR_WFC_TIMEOUT_MIN 0
    +#define DRBD_DEGR_WFC_TIMEOUT_MAX 300000
    +#define DRBD_DEGR_WFC_TIMEOUT_DEF 0
    +
    +#define DRBD_OUTDATED_WFC_TIMEOUT_MIN 0
    +#define DRBD_OUTDATED_WFC_TIMEOUT_MAX 300000
    +#define DRBD_OUTDATED_WFC_TIMEOUT_DEF 0
    +/* }*/
    +
    +/* net { */
    + /* timeout, unit centi seconds
    + * more than one minute timeout is not usefull */
    +#define DRBD_TIMEOUT_MIN 1
    +#define DRBD_TIMEOUT_MAX 600
    +#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
    +
    + /* active connection retries when C_WF_CONNECTION */
    +#define DRBD_CONNECT_INT_MIN 1
    +#define DRBD_CONNECT_INT_MAX 120
    +#define DRBD_CONNECT_INT_DEF 10 /* seconds */
    +
    + /* keep-alive probes when idle */
    +#define DRBD_PING_INT_MIN 1
    +#define DRBD_PING_INT_MAX 120
    +#define DRBD_PING_INT_DEF 10
    +
    + /* timeout for the ping packets.*/
    +#define DRBD_PING_TIMEO_MIN 1
    +#define DRBD_PING_TIMEO_MAX 100
    +#define DRBD_PING_TIMEO_DEF 5
    +
    + /* max number of write requests between write barriers */
    +#define DRBD_MAX_EPOCH_SIZE_MIN 1
    +#define DRBD_MAX_EPOCH_SIZE_MAX 20000
    +#define DRBD_MAX_EPOCH_SIZE_DEF 2048
    +
    + /* I don't think that a tcp send buffer of more than 10M is usefull */
    +#define DRBD_SNDBUF_SIZE_MIN 0
    +#define DRBD_SNDBUF_SIZE_MAX (10<<20)
    +#define DRBD_SNDBUF_SIZE_DEF (2*65535)
    +
    +#define DRBD_RCVBUF_SIZE_MIN 0
    +#define DRBD_RCVBUF_SIZE_MAX (10<<20)
    +#define DRBD_RCVBUF_SIZE_DEF (2*65535)
    +
    + /* @4k PageSize -> 128kB - 512MB */
    +#define DRBD_MAX_BUFFERS_MIN 32
    +#define DRBD_MAX_BUFFERS_MAX 131072
    +#define DRBD_MAX_BUFFERS_DEF 2048
    +
    + /* @4k PageSize -> 4kB - 512MB */
    +#define DRBD_UNPLUG_WATERMARK_MIN 1
    +#define DRBD_UNPLUG_WATERMARK_MAX 131072
    +#define DRBD_UNPLUG_WATERMARK_DEF (DRBD_MAX_BUFFERS_DEF/16)
    +
    + /* 0 is disabled.
    + * 200 should be more than enough even for very short timeouts */
    +#define DRBD_KO_COUNT_MIN 0
    +#define DRBD_KO_COUNT_MAX 200
    +#define DRBD_KO_COUNT_DEF 0
    +/* } */
    +
    +/* syncer { */
    + /* FIXME allow rate to be zero? */
    +#define DRBD_RATE_MIN 1
    +/* channel bonding 10 GbE, or other hardware */
    +#define DRBD_RATE_MAX (4 << 20)
    +#define DRBD_RATE_DEF 250 /* kb/second */
    +
    + /* less than 7 would hit performance unneccessarily.
    + * 3833 is the largest prime that still does fit
    + * into 64 sectors of activity log */
    +#define DRBD_AL_EXTENTS_MIN 7
    +#define DRBD_AL_EXTENTS_MAX 3833
    +#define DRBD_AL_EXTENTS_DEF 127
    +
    +#define DRBD_AFTER_MIN -1
    +#define DRBD_AFTER_MAX 255
    +#define DRBD_AFTER_DEF -1
    +
    +/* } */
    +
    +/* drbdsetup XY resize -d Z
    + * you are free to reduce the device size to nothing, if you want to.
    + * the upper limit with 64bit kernel, enough ram and flexible meta data
    + * is 16 TB, currently. */
    +/* DRBD_MAX_SECTORS */
    +#define DRBD_DISK_SIZE_SECT_MIN 0
    +#define DRBD_DISK_SIZE_SECT_MAX (16 * (2LLU << 30))
    +#define DRBD_DISK_SIZE_SECT_DEF 0 /* = disabled = no user size... */
    +
    +#define DRBD_ON_IO_ERROR_DEF EP_PASS_ON
    +#define DRBD_FENCING_DEF FP_DONT_CARE
    +#define DRBD_AFTER_SB_0P_DEF ASB_DISCONNECT
    +#define DRBD_AFTER_SB_1P_DEF ASB_DISCONNECT
    +#define DRBD_AFTER_SB_2P_DEF ASB_DISCONNECT
    +#define DRBD_RR_CONFLICT_DEF ASB_DISCONNECT
    +
    +#define DRBD_MAX_BIO_BVECS_MIN 0
    +#define DRBD_MAX_BIO_BVECS_MAX 128
    +#define DRBD_MAX_BIO_BVECS_DEF 0
    +
    +#undef RANGE
    +#endif
    diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
    new file mode 100644
    index 0000000..db5721a
    --- /dev/null
    +++ b/include/linux/drbd_nl.h
    @@ -0,0 +1,137 @@
    +/*
    + PAKET( name,
    + TYPE ( pn, pr, member )
    + ...
    + )
    +
    + You may never reissue one of the pn arguments
    +*/
    +
    +#if !defined(NL_PACKET) || !defined(NL_STRING) || !defined(NL_INTEGER) || !defined(NL_BIT) || !defined(NL_INT64)
    +#error "The macros NL_PACKET, NL_STRING, NL_INTEGER, NL_INT64 and NL_BIT needs to be defined"
    +#endif
    +
    +NL_PACKET(primary, 1,
    + NL_BIT( 1, T_MAY_IGNORE, overwrite_peer)
    +)
    +
    +NL_PACKET(secondary, 2, )
    +
    +NL_PACKET(disk_conf, 3,
    + NL_INT64( 2, T_MAY_IGNORE, disk_size)
    + NL_STRING( 3, T_MANDATORY, backing_dev, 128)
    + NL_STRING( 4, T_MANDATORY, meta_dev, 128)
    + NL_INTEGER( 5, T_MANDATORY, meta_dev_idx)
    + NL_INTEGER( 6, T_MAY_IGNORE, on_io_error)
    + NL_INTEGER( 7, T_MAY_IGNORE, fencing)
    + NL_BIT( 37, T_MAY_IGNORE, use_bmbv)
    + NL_BIT( 53, T_MAY_IGNORE, no_disk_flush)
    + NL_BIT( 54, T_MAY_IGNORE, no_md_flush)
    + /* 55 max_bio_size was available in 8.2.6rc2 */
    + NL_INTEGER( 56, T_MAY_IGNORE, max_bio_bvecs)
    + NL_BIT( 57, T_MAY_IGNORE, no_disk_barrier)
    + NL_BIT( 58, T_MAY_IGNORE, no_disk_drain)
    +)
    +
    +NL_PACKET(detach, 4, )
    +
    +NL_PACKET(net_conf, 5,
    + NL_STRING( 8, T_MANDATORY, my_addr, 128)
    + NL_STRING( 9, T_MANDATORY, peer_addr, 128)
    + NL_STRING( 10, T_MAY_IGNORE, shared_secret, SHARED_SECRET_MAX)
    + NL_STRING( 11, T_MAY_IGNORE, cram_hmac_alg, SHARED_SECRET_MAX)
    + NL_STRING( 44, T_MAY_IGNORE, integrity_alg, SHARED_SECRET_MAX)
    + NL_INTEGER( 14, T_MAY_IGNORE, timeout)
    + NL_INTEGER( 15, T_MANDATORY, wire_protocol)
    + NL_INTEGER( 16, T_MAY_IGNORE, try_connect_int)
    + NL_INTEGER( 17, T_MAY_IGNORE, ping_int)
    + NL_INTEGER( 18, T_MAY_IGNORE, max_epoch_size)
    + NL_INTEGER( 19, T_MAY_IGNORE, max_buffers)
    + NL_INTEGER( 20, T_MAY_IGNORE, unplug_watermark)
    + NL_INTEGER( 21, T_MAY_IGNORE, sndbuf_size)
    + NL_INTEGER( 22, T_MAY_IGNORE, ko_count)
    + NL_INTEGER( 24, T_MAY_IGNORE, after_sb_0p)
    + NL_INTEGER( 25, T_MAY_IGNORE, after_sb_1p)
    + NL_INTEGER( 26, T_MAY_IGNORE, after_sb_2p)
    + NL_INTEGER( 39, T_MAY_IGNORE, rr_conflict)
    + NL_INTEGER( 40, T_MAY_IGNORE, ping_timeo)
    + NL_INTEGER( 67, T_MAY_IGNORE, rcvbuf_size)
    + /* 59 addr_family was available in GIT, never released */
    + NL_BIT( 60, T_MANDATORY, mind_af)
    + NL_BIT( 27, T_MAY_IGNORE, want_lose)
    + NL_BIT( 28, T_MAY_IGNORE, two_primaries)
    + NL_BIT( 41, T_MAY_IGNORE, always_asbp)
    + NL_BIT( 61, T_MAY_IGNORE, no_cork)
    + NL_BIT( 62, T_MANDATORY, auto_sndbuf_size)
    +)
    +
    +NL_PACKET(disconnect, 6, )
    +
    +NL_PACKET(resize, 7,
    + NL_INT64( 29, T_MAY_IGNORE, resize_size)
    +)
    +
    +NL_PACKET(syncer_conf, 8,
    + NL_INTEGER( 30, T_MAY_IGNORE, rate)
    + NL_INTEGER( 31, T_MAY_IGNORE, after)
    + NL_INTEGER( 32, T_MAY_IGNORE, al_extents)
    + NL_STRING( 52, T_MAY_IGNORE, verify_alg, SHARED_SECRET_MAX)
    + NL_STRING( 51, T_MAY_IGNORE, cpu_mask, 32)
    + NL_STRING( 64, T_MAY_IGNORE, csums_alg, SHARED_SECRET_MAX)
    + NL_BIT( 65, T_MAY_IGNORE, use_rle)
    +)
    +
    +NL_PACKET(invalidate, 9, )
    +NL_PACKET(invalidate_peer, 10, )
    +NL_PACKET(pause_sync, 11, )
    +NL_PACKET(resume_sync, 12, )
    +NL_PACKET(suspend_io, 13, )
    +NL_PACKET(resume_io, 14, )
    +NL_PACKET(outdate, 15, )
    +NL_PACKET(get_config, 16, )
    +NL_PACKET(get_state, 17,
    + NL_INTEGER( 33, T_MAY_IGNORE, state_i)
    +)
    +
    +NL_PACKET(get_uuids, 18,
    + NL_STRING( 34, T_MAY_IGNORE, uuids, (UI_SIZE*sizeof(__u64)))
    + NL_INTEGER( 35, T_MAY_IGNORE, uuids_flags)
    +)
    +
    +NL_PACKET(get_timeout_flag, 19,
    + NL_BIT( 36, T_MAY_IGNORE, use_degraded)
    +)
    +
    +NL_PACKET(call_helper, 20,
    + NL_STRING( 38, T_MAY_IGNORE, helper, 32)
    +)
    +
    +/* Tag nr 42 already allocated in drbd-8.1 development. */
    +
    +NL_PACKET(sync_progress, 23,
    + NL_INTEGER( 43, T_MAY_IGNORE, sync_progress)
    +)
    +
    +NL_PACKET(dump_ee, 24,
    + NL_STRING( 45, T_MAY_IGNORE, dump_ee_reason, 32)
    + NL_STRING( 46, T_MAY_IGNORE, seen_digest, SHARED_SECRET_MAX)
    + NL_STRING( 47, T_MAY_IGNORE, calc_digest, SHARED_SECRET_MAX)
    + NL_INT64( 48, T_MAY_IGNORE, ee_sector)
    + NL_INT64( 49, T_MAY_IGNORE, ee_block_id)
    + NL_STRING( 50, T_MAY_IGNORE, ee_data, 32 << 10)
    +)
    +
    +NL_PACKET(start_ov, 25,
    + NL_INT64( 66, T_MAY_IGNORE, start_sector)
    +)
    +
    +NL_PACKET(new_c_uuid, 26,
    + NL_BIT( 63, T_MANDATORY, clear_bm)
    +)
    +
    +#undef NL_PACKET
    +#undef NL_INTEGER
    +#undef NL_INT64
    +#undef NL_BIT
    +#undef NL_STRING
    +
    diff --git a/include/linux/drbd_tag_magic.h b/include/linux/drbd_tag_magic.h
    new file mode 100644
    index 0000000..fcdff84
    --- /dev/null
    +++ b/include/linux/drbd_tag_magic.h
    @@ -0,0 +1,83 @@
    +#ifndef DRBD_TAG_MAGIC_H
    +#define DRBD_TAG_MAGIC_H
    +
    +#define TT_END 0
    +#define TT_REMOVED 0xE000
    +
    +/* declare packet_type enums */
    +enum packet_types {
    +#define NL_PACKET(name, number, fields) P_ ## name = number,
    +#define NL_INTEGER(pn, pr, member)
    +#define NL_INT64(pn, pr, member)
    +#define NL_BIT(pn, pr, member)
    +#define NL_STRING(pn, pr, member, len)
    +#include "drbd_nl.h"
    + P_nl_after_last_packet,
    +};
    +
    +/* These struct are used to deduce the size of the tag lists: */
    +#define NL_PACKET(name, number, fields) \
    + struct name ## _tag_len_struct { fields };
    +#define NL_INTEGER(pn, pr, member) \
    + int member; int tag_and_len ## member;
    +#define NL_INT64(pn, pr, member) \
    + __u64 member; int tag_and_len ## member;
    +#define NL_BIT(pn, pr, member) \
    + unsigned char member:1; int tag_and_len ## member;
    +#define NL_STRING(pn, pr, member, len) \
    + unsigned char member[len]; int member ## _len; \
    + int tag_and_len ## member;
    +#include "linux/drbd_nl.h"
    +
    +/* declate tag-list-sizes */
    +static const int tag_list_sizes[] = {
    +#define NL_PACKET(name, number, fields) 2 fields ,
    +#define NL_INTEGER(pn, pr, member) + 4 + 4
    +#define NL_INT64(pn, pr, member) + 4 + 8
    +#define NL_BIT(pn, pr, member) + 4 + 1
    +#define NL_STRING(pn, pr, member, len) + 4 + (len)
    +#include "drbd_nl.h"
    +};
    +
    +/* The two highest bits are used for the tag type */
    +#define TT_MASK 0xC000
    +#define TT_INTEGER 0x0000
    +#define TT_INT64 0x4000
    +#define TT_BIT 0x8000
    +#define TT_STRING 0xC000
    +/* The next bit indicates if processing of the tag is mandatory */
    +#define T_MANDATORY 0x2000
    +#define T_MAY_IGNORE 0x0000
    +#define TN_MASK 0x1fff
    +/* The remaining 13 bits are used to enumerate the tags */
    +
    +#define tag_type(T) ((T) & TT_MASK)
    +#define tag_number(T) ((T) & TN_MASK)
    +
    +/* declare tag enums */
    +#define NL_PACKET(name, number, fields) fields
    +enum drbd_tags {
    +#define NL_INTEGER(pn, pr, member) T_ ## member = pn | TT_INTEGER | pr ,
    +#define NL_INT64(pn, pr, member) T_ ## member = pn | TT_INT64 | pr ,
    +#define NL_BIT(pn, pr, member) T_ ## member = pn | TT_BIT | pr ,
    +#define NL_STRING(pn, pr, member, len) T_ ## member = pn | TT_STRING | pr ,
    +#include "drbd_nl.h"
    +};
    +
    +struct tag {
    + const char *name;
    + int type_n_flags;
    + int max_len;
    +};
    +
    +/* declare tag names */
    +#define NL_PACKET(name, number, fields) fields
    +static const struct tag tag_descriptions[] = {
    +#define NL_INTEGER(pn, pr, member) [ pn ] = { #member, TT_INTEGER | pr, sizeof(int) },
    +#define NL_INT64(pn, pr, member) [ pn ] = { #member, TT_INT64 | pr, sizeof(__u64) },
    +#define NL_BIT(pn, pr, member) [ pn ] = { #member, TT_BIT | pr, sizeof(int) },
    +#define NL_STRING(pn, pr, member, len) [ pn ] = { #member, TT_STRING | pr, (len) },
    +#include "drbd_nl.h"
    +};
    +
    +#endif
    diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
    new file mode 100644
    index 0000000..c3d438c
    --- /dev/null
    +++ b/drivers/block/drbd/drbd_nl.c
    @@ -0,0 +1,2350 @@
    +/*
    + drbd_nl.c
    +
    + This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
    +
    + Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
    + Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
    + Copyright (C) 2002-2008, 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.
    +
    + */
    +
    +#include <linux/autoconf.h>
    +#include <linux/module.h>
    +#include <linux/drbd.h>
    +#include <linux/in.h>
    +#include <linux/fs.h>
    +#include <linux/file.h>
    +#include <linux/slab.h>
    +#include <linux/connector.h>
    +#include <linux/blkpg.h>
    +#include <linux/cpumask.h>
    +#include "drbd_int.h"
    +#include "drbd_tracing.h"
    +#include "drbd_wrappers.h"
    +#include <asm/unaligned.h>
    +#include <linux/drbd_tag_magic.h>
    +#include <linux/drbd_limits.h>
    +
    +static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
    +static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
    +static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
    +
    +/* see get_sb_bdev and bd_claim */
    +static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
    +
    +/* Generate the tag_list to struct functions */
    +#define NL_PACKET(name, number, fields) \
    +static int name ## _from_tags(struct drbd_conf *mdev, \
    + unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
    +static int name ## _from_tags(struct drbd_conf *mdev, \
    + unsigned short *tags, struct name *arg) \
    +{ \
    + int tag; \
    + int dlen; \
    + \
    + while ((tag = get_unaligned(tags++)) != TT_END) { \
    + dlen = get_unaligned(tags++); \
    + switch (tag_number(tag)) { \
    + fields \
    + default: \
    + if (tag & T_MANDATORY) { \
    + dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
    + return 0; \
    + } \
    + } \
    + tags = (unsigned short *)((char *)tags + dlen); \
    + } \
    + return 1; \
    +}
    +#define NL_INTEGER(pn, pr, member) \
    + case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
    + arg->member = get_unaligned((int *)(tags)); \
    + break;
    +#define NL_INT64(pn, pr, member) \
    + case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
    + arg->member = get_unaligned((u64 *)(tags)); \
    + break;
    +#define NL_BIT(pn, pr, member) \
    + case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
    + arg->member = *(char *)(tags) ? 1 : 0; \
    + break;
    +#define NL_STRING(pn, pr, member, len) \
    + case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
    + if (dlen > len) { \
    + dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
    + #member, dlen, (unsigned int)len); \
    + return 0; \
    + } \
    + arg->member ## _len = dlen; \
    + memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
    + break;
    +#include "linux/drbd_nl.h"
    +
    +/* Generate the struct to tag_list functions */
    +#define NL_PACKET(name, number, fields) \
    +static unsigned short* \
    +name ## _to_tags(struct drbd_conf *mdev, \
    + struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
    +static unsigned short* \
    +name ## _to_tags(struct drbd_conf *mdev, \
    + struct name *arg, unsigned short *tags) \
    +{ \
    + fields \
    + return tags; \
    +}
    +
    +#define NL_INTEGER(pn, pr, member) \
    + put_unaligned(pn | pr | TT_INTEGER, tags++); \
    + put_unaligned(sizeof(int), tags++); \
    + put_unaligned(arg->member, (int *)tags); \
    + tags = (unsigned short *)((char *)tags+sizeof(int));
    +#define NL_INT64(pn, pr, member) \
    + put_unaligned(pn | pr | TT_INT64, tags++); \
    + put_unaligned(sizeof(u64), tags++); \
    + put_unaligned(arg->member, (u64 *)tags); \
    + tags = (unsigned short *)((char *)tags+sizeof(u64));
    +#define NL_BIT(pn, pr, member) \
    + put_unaligned(pn | pr | TT_BIT, tags++); \
    + put_unaligned(sizeof(char), tags++); \
    + *(char *)tags = arg->member; \
    + tags = (unsigned short *)((char *)tags+sizeof(char));
    +#define NL_STRING(pn, pr, member, len) \
    + put_unaligned(pn | pr | TT_STRING, tags++); \
    + put_unaligned(arg->member ## _len, tags++); \
    + memcpy(tags, arg->member, arg->member ## _len); \
    + tags = (unsigned short *)((char *)tags + arg->member ## _len);
    +#include "linux/drbd_nl.h"
    +
    +void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
    +void drbd_nl_send_reply(struct cn_msg *, int);
    +
    +int drbd_khelper(struct drbd_conf *mdev, char *cmd)
    +{
    + char *envp[] = { "HOME=/",
    + "TERM=linux",
    + "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
    + NULL, /* Will be set to address family */
    + NULL, /* Will be set to address */
    + NULL };
    +
    + char mb[12], af[20], ad[60], *afs;
    + char *argv[] = {usermode_helper, cmd, mb, NULL };
    + int ret;
    +
    + snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
    +
    + if (get_net_conf(mdev)) {
    + switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
    + case AF_INET6:
    + afs = "ipv6";
    + snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
    + &((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
    + break;
    + case AF_INET:
    + afs = "ipv4";
    + snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
    + &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
    + break;
    + default:
    + afs = "ssocks";
    + snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
    + &((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
    + }
    + snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
    + envp[3]=af;
    + envp[4]=ad;
    + put_net_conf(mdev);
    + }
    +
    + dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
    +
    + drbd_bcast_ev_helper(mdev, cmd);
    + ret = call_usermodehelper(usermode_helper, argv, envp, 1);
    + if (ret)
    + dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
    + usermode_helper, cmd, mb,
    + (ret >> 8) & 0xff, ret);
    + else
    + dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
    + usermode_helper, cmd, mb,
    + (ret >> 8) & 0xff, ret);
    +
    + if (ret < 0) /* Ignore any ERRNOs we got. */
    + ret = 0;
    +
    + return ret;
    +}
    +
    +enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
    +{
    + char *ex_to_string;
    + int r;
    + enum drbd_disk_state nps;
    + enum drbd_fencing_p fp;
    +
    + D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
    +
    + if (get_ldev_if_state(mdev, D_CONSISTENT)) {
    + fp = mdev->ldev->dc.fencing;
    + put_ldev(mdev);
    + } else {
    + dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
    + return mdev->state.pdsk;
    + }
    +
    + if (fp == FP_STONITH)
    + _drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE);
    +
    + r = drbd_khelper(mdev, "fence-peer");
    +
    + switch ((r>>8) & 0xff) {
    + case 3: /* peer is inconsistent */
    + ex_to_string = "peer is inconsistent or worse";
    + nps = D_INCONSISTENT;
    + break;
    + case 4:
    + ex_to_string = "peer is outdated";
    + nps = D_OUTDATED;
    + break;
    + case 5: /* peer was down, we will(have) create(d) a new UUID anyways... */
    + /* If we would be more strict, we would return D_UNKNOWN here. */
    + ex_to_string = "peer is unreachable, assumed to be dead";
    + nps = D_OUTDATED;
    + break;
    + case 6: /* Peer is primary, voluntarily outdate myself.
    + * This is useful when an unconnected R_SECONDARY is asked to
    + * become R_PRIMARY, but findes the other peer being active. */
    + ex_to_string = "peer is active";
    + dev_warn(DEV, "Peer is primary, outdating myself.\n");
    + nps = D_UNKNOWN;
    + _drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
    + break;
    + case 7:
    + if (fp != FP_STONITH)
    + dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
    + ex_to_string = "peer was stonithed";
    + nps = D_OUTDATED;
    + break;
    + default:
    + /* The script is broken ... */
    + nps = D_UNKNOWN;
    + dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
    + return nps;
    + }
    +
    + dev_info(DEV, "fence-peer helper returned %d (%s)\n",
    + (r>>8) & 0xff, ex_to_string);
    + return nps;
    +}
    +
    +
    +int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
    +{
    + const int max_tries = 4;
    + int r = 0;
    + int try = 0;
    + int forced = 0;
    + union drbd_state mask, val;
    + enum drbd_disk_state nps;
    +
    + if (new_role == R_PRIMARY)
    + request_ping(mdev); /* Detect a dead peer ASAP */
    +
    + mutex_lock(&mdev->state_mutex);
    +
    + mask.i = 0; mask.role = R_MASK;
    + val.i = 0; val.role = new_role;
    +
    + while (try++ < max_tries) {
    + r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
    +
    + /* in case we first succeeded to outdate,
    + * but now suddenly could establish a connection */
    + if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
    + val.pdsk = 0;
    + mask.pdsk = 0;
    + continue;
    + }
    +
    + if (r == SS_NO_UP_TO_DATE_DISK && force &&
    + (mdev->state.disk == D_INCONSISTENT ||
    + mdev->state.disk == D_OUTDATED)) {
    + mask.disk = D_MASK;
    + val.disk = D_UP_TO_DATE;
    + forced = 1;
    + continue;
    + }
    +
    + if (r == SS_NO_UP_TO_DATE_DISK &&
    + mdev->state.disk == D_CONSISTENT) {
    + D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
    + nps = drbd_try_outdate_peer(mdev);
    +
    + if (nps == D_OUTDATED) {
    + val.disk = D_UP_TO_DATE;
    + mask.disk = D_MASK;
    + }
    +
    + val.pdsk = nps;
    + mask.pdsk = D_MASK;
    +
    + continue;
    + }
    +
    + if (r == SS_NOTHING_TO_DO)
    + goto fail;
    + if (r == SS_PRIMARY_NOP) {
    + nps = drbd_try_outdate_peer(mdev);
    +
    + if (force && nps > D_OUTDATED) {
    + dev_warn(DEV, "Forced into split brain situation!\n");
    + nps = D_OUTDATED;
    + }
    +
    + mask.pdsk = D_MASK;
    + val.pdsk = nps;
    +
    + continue;
    + }
    + if (r == SS_TWO_PRIMARIES) {
    + /* Maybe the peer is detected as dead very soon...
    + retry at most once more in this case. */
    + __set_current_state(TASK_INTERRUPTIBLE);
    + schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
    + if (try < max_tries)
    + try = max_tries - 1;
    + continue;
    + }
    + if (r < SS_SUCCESS) {
    + r = _drbd_request_state(mdev, mask, val,
    + CS_VERBOSE + CS_WAIT_COMPLETE);
    + if (r < SS_SUCCESS)
    + goto fail;
    + }
    + break;
    + }
    +
    + if (forced)
    + dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
    +
    + /* Wait until nothing is on the fly :) */
    + wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
    +
    + if (new_role == R_SECONDARY) {
    + set_disk_ro(mdev->vdisk, TRUE);
    + if (get_ldev(mdev)) {
    + mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
    + put_ldev(mdev);
    + }
    + } else {
    + if (get_net_conf(mdev)) {
    + mdev->net_conf->want_lose = 0;
    + put_net_conf(mdev);
    + }
    + set_disk_ro(mdev->vdisk, FALSE);
    + if (get_ldev(mdev)) {
    + if (((mdev->state.conn < C_CONNECTED ||
    + mdev->state.pdsk <= D_FAILED)
    + && mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
    + drbd_uuid_new_current(mdev);
    +
    + mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
    + put_ldev(mdev);
    + }
    + }
    +
    + if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
    + drbd_al_to_on_disk_bm(mdev);
    + put_ldev(mdev);
    + }
    +
    + if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
    + /* if this was forced, we should consider sync */
    + if (forced)
    + drbd_send_uuids(mdev);
    + drbd_send_state(mdev);
    + }
    +
    + drbd_md_sync(mdev);
    +
    + kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
    + fail:
    + mutex_unlock(&mdev->state_mutex);
    + return r;
    +}
    +
    +
    +static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + struct primary primary_args;
    +
    + memset(&primary_args, 0, sizeof(struct primary));
    + if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
    + reply->ret_code = ERR_MANDATORY_TAG;
    + return 0;
    + }
    +
    + reply->ret_code =
    + drbd_set_role(mdev, R_PRIMARY, primary_args.overwrite_peer);
    +
    + return 0;
    +}
    +
    +static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
    +
    + return 0;
    +}
    +
    +/* initializes the md.*_offset members, so we are able to find
    + * the on disk meta data */
    +static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
    + struct drbd_backing_dev *bdev)
    +{
    + sector_t md_size_sect = 0;
    + switch (bdev->dc.meta_dev_idx) {
    + default:
    + /* v07 style fixed size indexed meta data */
    + bdev->md.md_size_sect = MD_RESERVED_SECT;
    + bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
    + bdev->md.al_offset = MD_AL_OFFSET;
    + bdev->md.bm_offset = MD_BM_OFFSET;
    + break;
    + case DRBD_MD_INDEX_FLEX_EXT:
    + /* just occupy the full device; unit: sectors */
    + bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
    + bdev->md.md_offset = 0;
    + bdev->md.al_offset = MD_AL_OFFSET;
    + bdev->md.bm_offset = MD_BM_OFFSET;
    + break;
    + case DRBD_MD_INDEX_INTERNAL:
    + case DRBD_MD_INDEX_FLEX_INT:
    + bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
    + /* al size is still fixed */
    + bdev->md.al_offset = -MD_AL_MAX_SIZE;
    + /* we need (slightly less than) ~ this much bitmap sectors: */
    + md_size_sect = drbd_get_capacity(bdev->backing_bdev);
    + md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
    + md_size_sect = BM_SECT_TO_EXT(md_size_sect);
    + md_size_sect = ALIGN(md_size_sect, 8);
    +
    + /* plus the "drbd meta data super block",
    + * and the activity log; */
    + md_size_sect += MD_BM_OFFSET;
    +
    + bdev->md.md_size_sect = md_size_sect;
    + /* bitmap offset is adjusted by 'super' block size */
    + bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
    + break;
    + }
    +}
    +
    +char *ppsize(char *buf, unsigned long long size)
    +{
    + /* Needs 9 bytes at max. */
    + static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
    + int base = 0;
    + while (size >= 10000) {
    + /* shift + round */
    + size = (size >> 10) + !!(size & (1<<9));
    + base++;
    + }
    + sprintf(buf, "%lu %cB", (long)size, units[base]);
    +
    + return buf;
    +}
    +
    +/* there is still a theoretical deadlock when called from receiver
    + * on an D_INCONSISTENT R_PRIMARY:
    + * remote READ does inc_ap_bio, receiver would need to receive answer
    + * packet from remote to dec_ap_bio again.
    + * receiver receive_sizes(), comes here,
    + * waits for ap_bio_cnt == 0. -> deadlock.
    + * but this cannot happen, actually, because:
    + * R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
    + * (not connected, or bad/no disk on peer):
    + * see drbd_fail_request_early, ap_bio_cnt is zero.
    + * R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
    + * peer may not initiate a resize.
    + */
    +void drbd_suspend_io(struct drbd_conf *mdev)
    +{
    + set_bit(SUSPEND_IO, &mdev->flags);
    + wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
    +}
    +
    +void drbd_resume_io(struct drbd_conf *mdev)
    +{
    + clear_bit(SUSPEND_IO, &mdev->flags);
    + wake_up(&mdev->misc_wait);
    +}
    +
    +/**
    + * drbd_determin_dev_size() - Sets the right device size obeying all constraints
    + * @mdev: DRBD device.
    + *
    + * Returns 0 on success, negative return values indicate errors.
    + * You should call drbd_md_sync() after calling this function.
    + */
    +enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev) __must_hold(local)
    +{
    + sector_t prev_first_sect, prev_size; /* previous meta location */
    + sector_t la_size;
    + sector_t size;
    + char ppb[10];
    +
    + int md_moved, la_size_changed;
    + enum determine_dev_size rv = unchanged;
    +
    + /* race:
    + * application request passes inc_ap_bio,
    + * but then cannot get an AL-reference.
    + * this function later may wait on ap_bio_cnt == 0. -> deadlock.
    + *
    + * to avoid that:
    + * Suspend IO right here.
    + * still lock the act_log to not trigger ASSERTs there.
    + */
    + drbd_suspend_io(mdev);
    +
    + /* no wait necessary anymore, actually we could assert that */
    + wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
    +
    + prev_first_sect = drbd_md_first_sector(mdev->ldev);
    + prev_size = mdev->ldev->md.md_size_sect;
    + la_size = mdev->ldev->md.la_size_sect;
    +
    + /* TODO: should only be some assert here, not (re)init... */
    + drbd_md_set_sector_offsets(mdev, mdev->ldev);
    +
    + size = drbd_new_dev_size(mdev, mdev->ldev);
    +
    + if (drbd_get_capacity(mdev->this_bdev) != size ||
    + drbd_bm_capacity(mdev) != size) {
    + int err;
    + err = drbd_bm_resize(mdev, size);
    + if (unlikely(err)) {
    + /* currently there is only one error: ENOMEM! */
    + size = drbd_bm_capacity(mdev)>>1;
    + if (size == 0) {
    + dev_err(DEV, "OUT OF MEMORY! "
    + "Could not allocate bitmap!\n");
    + } else {
    + dev_err(DEV, "BM resizing failed. "
    + "Leaving size unchanged at size = %lu KB\n",
    + (unsigned long)size);
    + }
    + rv = dev_size_error;
    + }
    + /* racy, see comments above. */
    + drbd_set_my_capacity(mdev, size);
    + mdev->ldev->md.la_size_sect = size;
    + dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
    + (unsigned long long)size>>1);
    + }
    + if (rv == dev_size_error)
    + goto out;
    +
    + la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
    +
    + md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
    + || prev_size != mdev->ldev->md.md_size_sect;
    +
    + if (la_size_changed || md_moved) {
    + drbd_al_shrink(mdev); /* All extents inactive. */
    + dev_info(DEV, "Writing the whole bitmap, %s\n",
    + la_size_changed && md_moved ? "size changed and md moved" :
    + la_size_changed ? "size changed" : "md moved");
    + rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
    + drbd_md_mark_dirty(mdev);
    + }
    +
    + if (size > la_size)
    + rv = grew;
    + if (size < la_size)
    + rv = shrunk;
    +out:
    + lc_unlock(mdev->act_log);
    + wake_up(&mdev->al_wait);
    + drbd_resume_io(mdev);
    +
    + return rv;
    +}
    +
    +sector_t
    +drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
    +{
    + sector_t p_size = mdev->p_size; /* partner's disk size. */
    + sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
    + sector_t m_size; /* my size */
    + sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
    + sector_t size = 0;
    +
    + m_size = drbd_get_max_capacity(bdev);
    +
    + if (p_size && m_size) {
    + size = min_t(sector_t, p_size, m_size);
    + } else {
    + if (la_size) {
    + size = la_size;
    + if (m_size && m_size < size)
    + size = m_size;
    + if (p_size && p_size < size)
    + size = p_size;
    + } else {
    + if (m_size)
    + size = m_size;
    + if (p_size)
    + size = p_size;
    + }
    + }
    +
    + if (size == 0)
    + dev_err(DEV, "Both nodes diskless!\n");
    +
    + if (u_size) {
    + if (u_size > size)
    + dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
    + (unsigned long)u_size>>1, (unsigned long)size>>1);
    + else
    + size = u_size;
    + }
    +
    + return size;
    +}
    +
    +/**
    + * drbd_check_al_size() - Ensures that the AL is of the right size
    + * @mdev: DRBD device.
    + *
    + * Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
    + * failed, and 0 on success. You should call drbd_md_sync() after you called
    + * this function.
    + */
    +static int drbd_check_al_size(struct drbd_conf *mdev)
    +{
    + struct lru_cache *n, *t;
    + struct lc_element *e;
    + unsigned int in_use;
    + int i;
    +
    + ERR_IF(mdev->sync_conf.al_extents < 7)
    + mdev->sync_conf.al_extents = 127;
    +
    + if (mdev->act_log &&
    + mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
    + return 0;
    +
    + in_use = 0;
    + t = mdev->act_log;
    + n = lc_create("act_log", drbd_al_ext_cache,
    + mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
    +
    + if (n == NULL) {
    + dev_err(DEV, "Cannot allocate act_log lru!\n");
    + return -ENOMEM;
    + }
    + spin_lock_irq(&mdev->al_lock);
    + if (t) {
    + for (i = 0; i < t->nr_elements; i++) {
    + e = lc_element_by_index(t, i);
    + if (e->refcnt)
    + dev_err(DEV, "refcnt(%d)==%d\n",
    + e->lc_number, e->refcnt);
    + in_use += e->refcnt;
    + }
    + }
    + if (!in_use)
    + mdev->act_log = n;
    + spin_unlock_irq(&mdev->al_lock);
    + if (in_use) {
    + dev_err(DEV, "Activity log still in use!\n");
    + lc_destroy(n);
    + return -EBUSY;
    + } else {
    + if (t)
    + lc_destroy(t);
    + }
    + drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
    + return 0;
    +}
    +
    +void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
    +{
    + struct request_queue * const q = mdev->rq_queue;
    + struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
    + int max_segments = mdev->ldev->dc.max_bio_bvecs;
    +
    + if (b->merge_bvec_fn && !mdev->ldev->dc.use_bmbv)
    + max_seg_s = PAGE_SIZE;
    +
    + max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
    +
    + blk_queue_max_sectors(q, max_seg_s >> 9);
    + blk_queue_max_phys_segments(q, max_segments ? max_segments : MAX_PHYS_SEGMENTS);
    + blk_queue_max_hw_segments(q, max_segments ? max_segments : MAX_HW_SEGMENTS);
    + blk_queue_max_segment_size(q, max_seg_s);
    + blk_queue_logical_block_size(q, 512);
    + blk_queue_segment_boundary(q, PAGE_SIZE-1);
    + blk_queue_stack_limits(q, b);
    +
    + if (b->merge_bvec_fn)
    + dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
    + b->merge_bvec_fn);
    + dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
    +
    + if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
    + dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
    + q->backing_dev_info.ra_pages,
    + b->backing_dev_info.ra_pages);
    + q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
    + }
    +}
    +
    +/* serialize deconfig (worker exiting, doing cleanup)
    + * and reconfig (drbdsetup disk, drbdsetup net)
    + *
    + * wait for a potentially exiting worker, then restart it,
    + * or start a new one.
    + */
    +static void drbd_reconfig_start(struct drbd_conf *mdev)
    +{
    + wait_event(mdev->state_wait, test_and_set_bit(CONFIG_PENDING, &mdev->flags));
    + wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
    + drbd_thread_start(&mdev->worker);
    +}
    +
    +/* if still unconfigured, stops worker again.
    + * if configured now, clears CONFIG_PENDING.
    + * wakes potential waiters */
    +static void drbd_reconfig_done(struct drbd_conf *mdev)
    +{
    + spin_lock_irq(&mdev->req_lock);
    + if (mdev->state.disk == D_DISKLESS &&
    + mdev->state.conn == C_STANDALONE &&
    + mdev->state.role == R_SECONDARY) {
    + set_bit(DEVICE_DYING, &mdev->flags);
    + drbd_thread_stop_nowait(&mdev->worker);
    + } else
    + clear_bit(CONFIG_PENDING, &mdev->flags);
    + spin_unlock_irq(&mdev->req_lock);
    + wake_up(&mdev->state_wait);
    +}
    +
    +/* does always return 0;
    + * interesting return code is in reply->ret_code */
    +static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + enum drbd_ret_codes retcode;
    + enum determine_dev_size dd;
    + sector_t max_possible_sectors;
    + sector_t min_md_device_sectors;
    + struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
    + struct inode *inode, *inode2;
    + struct lru_cache *resync_lru = NULL;
    + union drbd_state ns, os;
    + int rv;
    + int cp_discovered = 0;
    + int logical_block_size;
    +
    + drbd_reconfig_start(mdev);
    +
    + /* if you want to reconfigure, please tear down first */
    + if (mdev->state.disk > D_DISKLESS) {
    + retcode = ERR_DISK_CONFIGURED;
    + goto fail;
    + }
    +
    + /* allocation not in the IO path, cqueue thread context */
    + nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
    + if (!nbc) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    +
    + nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
    + nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
    + nbc->dc.fencing = DRBD_FENCING_DEF;
    + nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
    +
    + if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
    + retcode = ERR_MANDATORY_TAG;
    + goto fail;
    + }
    +
    + if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
    + retcode = ERR_MD_IDX_INVALID;
    + goto fail;
    + }
    +
    + nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
    + if (IS_ERR(nbc->lo_file)) {
    + dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
    + PTR_ERR(nbc->lo_file));
    + nbc->lo_file = NULL;
    + retcode = ERR_OPEN_DISK;
    + goto fail;
    + }
    +
    + inode = nbc->lo_file->f_dentry->d_inode;
    +
    + if (!S_ISBLK(inode->i_mode)) {
    + retcode = ERR_DISK_NOT_BDEV;
    + goto fail;
    + }
    +
    + nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
    + if (IS_ERR(nbc->md_file)) {
    + dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
    + PTR_ERR(nbc->md_file));
    + nbc->md_file = NULL;
    + retcode = ERR_OPEN_MD_DISK;
    + goto fail;
    + }
    +
    + inode2 = nbc->md_file->f_dentry->d_inode;
    +
    + if (!S_ISBLK(inode2->i_mode)) {
    + retcode = ERR_MD_NOT_BDEV;
    + goto fail;
    + }
    +
    + nbc->backing_bdev = inode->i_bdev;
    + if (bd_claim(nbc->backing_bdev, mdev)) {
    + printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
    + nbc->backing_bdev, mdev,
    + nbc->backing_bdev->bd_holder,
    + nbc->backing_bdev->bd_contains->bd_holder,
    + nbc->backing_bdev->bd_holders);
    + retcode = ERR_BDCLAIM_DISK;
    + goto fail;
    + }
    +
    + resync_lru = lc_create("resync", drbd_bm_ext_cache,
    + 61, sizeof(struct bm_extent),
    + offsetof(struct bm_extent, lce));
    + if (!resync_lru) {
    + retcode = ERR_NOMEM;
    + goto release_bdev_fail;
    + }
    +
    + /* meta_dev_idx >= 0: external fixed size,
    + * possibly multiple drbd sharing one meta device.
    + * TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
    + * not yet used by some other drbd minor!
    + * (if you use drbd.conf + drbdadm,
    + * that should check it for you already; but if you don't, or someone
    + * fooled it, we need to double check here) */
    + nbc->md_bdev = inode2->i_bdev;
    + if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
    + : (void *) drbd_m_holder)) {
    + retcode = ERR_BDCLAIM_MD_DISK;
    + goto release_bdev_fail;
    + }
    +
    + if ((nbc->backing_bdev == nbc->md_bdev) !=
    + (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
    + nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
    + retcode = ERR_MD_IDX_INVALID;
    + goto release_bdev2_fail;
    + }
    +
    + /* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
    + drbd_md_set_sector_offsets(mdev, nbc);
    +
    + if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
    + dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
    + (unsigned long long) drbd_get_max_capacity(nbc),
    + (unsigned long long) nbc->dc.disk_size);
    + retcode = ERR_DISK_TO_SMALL;
    + goto release_bdev2_fail;
    + }
    +
    + if (nbc->dc.meta_dev_idx < 0) {
    + max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
    + /* at least one MB, otherwise it does not make sense */
    + min_md_device_sectors = (2<<10);
    + } else {
    + max_possible_sectors = DRBD_MAX_SECTORS;
    + min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
    + }
    +
    + if (drbd_get_capacity(nbc->md_bdev) > max_possible_sectors)
    + dev_warn(DEV, "truncating very big lower level device "
    + "to currently maximum possible %llu sectors\n",
    + (unsigned long long) max_possible_sectors);
    +
    + if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
    + retcode = ERR_MD_DISK_TO_SMALL;
    + dev_warn(DEV, "refusing attach: md-device too small, "
    + "at least %llu sectors needed for this meta-disk type\n",
    + (unsigned long long) min_md_device_sectors);
    + goto release_bdev2_fail;
    + }
    +
    + /* Make sure the new disk is big enough
    + * (we may currently be R_PRIMARY with no local disk...) */
    + if (drbd_get_max_capacity(nbc) <
    + drbd_get_capacity(mdev->this_bdev)) {
    + retcode = ERR_DISK_TO_SMALL;
    + goto release_bdev2_fail;
    + }
    +
    + nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
    +
    + drbd_suspend_io(mdev);
    + /* also wait for the last barrier ack. */
    + wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
    +
    + retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
    + drbd_resume_io(mdev);
    + if (retcode < SS_SUCCESS)
    + goto release_bdev2_fail;
    +
    + if (!get_ldev_if_state(mdev, D_ATTACHING))
    + goto force_diskless;
    +
    + drbd_md_set_sector_offsets(mdev, nbc);
    +
    + if (!mdev->bitmap) {
    + if (drbd_bm_init(mdev)) {
    + retcode = ERR_NOMEM;
    + goto force_diskless_dec;
    + }
    + }
    +
    + retcode = drbd_md_read(mdev, nbc);
    + if (retcode != NO_ERROR)
    + goto force_diskless_dec;
    +
    + if (mdev->state.conn < C_CONNECTED &&
    + mdev->state.role == R_PRIMARY &&
    + (mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
    + dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
    + (unsigned long long)mdev->ed_uuid);
    + retcode = ERR_DATA_NOT_CURRENT;
    + goto force_diskless_dec;
    + }
    +
    + /* Since we are diskless, fix the activity log first... */
    + if (drbd_check_al_size(mdev)) {
    + retcode = ERR_NOMEM;
    + goto force_diskless_dec;
    + }
    +
    + /* Prevent shrinking of consistent devices ! */
    + if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
    + drbd_new_dev_size(mdev, nbc) < nbc->md.la_size_sect) {
    + dev_warn(DEV, "refusing to truncate a consistent device\n");
    + retcode = ERR_DISK_TO_SMALL;
    + goto force_diskless_dec;
    + }
    +
    + if (!drbd_al_read_log(mdev, nbc)) {
    + retcode = ERR_IO_MD_DISK;
    + goto force_diskless_dec;
    + }
    +
    + /* allocate a second IO page if logical_block_size != 512 */
    + logical_block_size = bdev_logical_block_size(nbc->md_bdev);
    + if (logical_block_size == 0)
    + logical_block_size = MD_SECTOR_SIZE;
    +
    + if (logical_block_size != MD_SECTOR_SIZE) {
    + if (!mdev->md_io_tmpp) {
    + struct page *page = alloc_page(GFP_NOIO);
    + if (!page)
    + goto force_diskless_dec;
    +
    + dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
    + logical_block_size, MD_SECTOR_SIZE);
    + dev_warn(DEV, "Workaround engaged (has performace impact).\n");
    +
    + mdev->md_io_tmpp = page;
    + }
    + }
    +
    + /* Reset the "barriers don't work" bits here, then force meta data to
    + * be written, to ensure we determine if barriers are supported. */
    + if (nbc->dc.no_md_flush)
    + set_bit(MD_NO_BARRIER, &mdev->flags);
    + else
    + clear_bit(MD_NO_BARRIER, &mdev->flags);
    +
    + /* Point of no return reached.
    + * Devices and memory are no longer released by error cleanup below.
    + * now mdev takes over responsibility, and the state engine should
    + * clean it up somewhere. */
    + D_ASSERT(mdev->ldev == NULL);
    + mdev->ldev = nbc;
    + mdev->resync = resync_lru;
    + nbc = NULL;
    + resync_lru = NULL;
    +
    + mdev->write_ordering = WO_bio_barrier;
    + drbd_bump_write_ordering(mdev, WO_bio_barrier);
    +
    + if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
    + set_bit(CRASHED_PRIMARY, &mdev->flags);
    + else
    + clear_bit(CRASHED_PRIMARY, &mdev->flags);
    +
    + if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
    + set_bit(CRASHED_PRIMARY, &mdev->flags);
    + cp_discovered = 1;
    + }
    +
    + mdev->send_cnt = 0;
    + mdev->recv_cnt = 0;
    + mdev->read_cnt = 0;
    + mdev->writ_cnt = 0;
    +
    + drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
    +
    + /* If I am currently not R_PRIMARY,
    + * but meta data primary indicator is set,
    + * I just now recover from a hard crash,
    + * and have been R_PRIMARY before that crash.
    + *
    + * Now, if I had no connection before that crash
    + * (have been degraded R_PRIMARY), chances are that
    + * I won't find my peer now either.
    + *
    + * In that case, and _only_ in that case,
    + * we use the degr-wfc-timeout instead of the default,
    + * so we can automatically recover from a crash of a
    + * degraded but active "cluster" after a certain timeout.
    + */
    + clear_bit(USE_DEGR_WFC_T, &mdev->flags);
    + if (mdev->state.role != R_PRIMARY &&
    + drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
    + !drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
    + set_bit(USE_DEGR_WFC_T, &mdev->flags);
    +
    + dd = drbd_determin_dev_size(mdev);
    + if (dd == dev_size_error) {
    + retcode = ERR_NOMEM_BITMAP;
    + goto force_diskless_dec;
    + } else if (dd == grew)
    + set_bit(RESYNC_AFTER_NEG, &mdev->flags);
    +
    + if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
    + dev_info(DEV, "Assuming that all blocks are out of sync "
    + "(aka FullSync)\n");
    + if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
    + retcode = ERR_IO_MD_DISK;
    + goto force_diskless_dec;
    + }
    + } else {
    + if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
    + retcode = ERR_IO_MD_DISK;
    + goto force_diskless_dec;
    + }
    + }
    +
    + if (cp_discovered) {
    + drbd_al_apply_to_bm(mdev);
    + drbd_al_to_on_disk_bm(mdev);
    + }
    +
    + spin_lock_irq(&mdev->req_lock);
    + os = mdev->state;
    + ns.i = os.i;
    + /* If MDF_CONSISTENT is not set go into inconsistent state,
    + otherwise investige MDF_WasUpToDate...
    + If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
    + otherwise into D_CONSISTENT state.
    + */
    + if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
    + if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
    + ns.disk = D_CONSISTENT;
    + else
    + ns.disk = D_OUTDATED;
    + } else {
    + ns.disk = D_INCONSISTENT;
    + }
    +
    + if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
    + ns.pdsk = D_OUTDATED;
    +
    + if ( ns.disk == D_CONSISTENT &&
    + (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
    + ns.disk = D_UP_TO_DATE;
    +
    + /* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
    + MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
    + this point, because drbd_request_state() modifies these
    + flags. */
    +
    + /* In case we are C_CONNECTED postpone any desicion on the new disk
    + state after the negotiation phase. */
    + if (mdev->state.conn == C_CONNECTED) {
    + mdev->new_state_tmp.i = ns.i;
    + ns.i = os.i;
    + ns.disk = D_NEGOTIATING;
    + }
    +
    + rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
    + ns = mdev->state;
    + spin_unlock_irq(&mdev->req_lock);
    +
    + if (rv < SS_SUCCESS)
    + goto force_diskless_dec;
    +
    + if (mdev->state.role == R_PRIMARY)
    + mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
    + else
    + mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
    +
    + drbd_md_mark_dirty(mdev);
    + drbd_md_sync(mdev);
    +
    + kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
    + put_ldev(mdev);
    + reply->ret_code = retcode;
    + drbd_reconfig_done(mdev);
    + return 0;
    +
    + force_diskless_dec:
    + put_ldev(mdev);
    + force_diskless:
    + drbd_force_state(mdev, NS(disk, D_DISKLESS));
    + drbd_md_sync(mdev);
    + release_bdev2_fail:
    + if (nbc)
    + bd_release(nbc->md_bdev);
    + release_bdev_fail:
    + if (nbc)
    + bd_release(nbc->backing_bdev);
    + fail:
    + if (nbc) {
    + if (nbc->lo_file)
    + fput(nbc->lo_file);
    + if (nbc->md_file)
    + fput(nbc->md_file);
    + kfree(nbc);
    + }
    + lc_destroy(resync_lru);
    +
    + reply->ret_code = retcode;
    + drbd_reconfig_done(mdev);
    + return 0;
    +}
    +
    +static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
    + return 0;
    +}
    +
    +static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int i, ns;
    + enum drbd_ret_codes retcode;
    + struct net_conf *new_conf = NULL;
    + struct crypto_hash *tfm = NULL;
    + struct crypto_hash *integrity_w_tfm = NULL;
    + struct crypto_hash *integrity_r_tfm = NULL;
    + struct hlist_head *new_tl_hash = NULL;
    + struct hlist_head *new_ee_hash = NULL;
    + struct drbd_conf *odev;
    + char hmac_name[CRYPTO_MAX_ALG_NAME];
    + void *int_dig_out = NULL;
    + void *int_dig_in = NULL;
    + void *int_dig_vv = NULL;
    + struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
    +
    + drbd_reconfig_start(mdev);
    +
    + if (mdev->state.conn > C_STANDALONE) {
    + retcode = ERR_NET_CONFIGURED;
    + goto fail;
    + }
    +
    + /* allocation not in the IO path, cqueue thread context */
    + new_conf = kmalloc(sizeof(struct net_conf), GFP_KERNEL);
    + if (!new_conf) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    +
    + memset(new_conf, 0, sizeof(struct net_conf));
    + new_conf->timeout = DRBD_TIMEOUT_DEF;
    + new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
    + new_conf->ping_int = DRBD_PING_INT_DEF;
    + new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
    + new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
    + new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
    + new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
    + new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
    + new_conf->ko_count = DRBD_KO_COUNT_DEF;
    + new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
    + new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
    + new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
    + new_conf->want_lose = 0;
    + new_conf->two_primaries = 0;
    + new_conf->wire_protocol = DRBD_PROT_C;
    + new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
    + new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
    +
    + if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
    + retcode = ERR_MANDATORY_TAG;
    + goto fail;
    + }
    +
    + if (new_conf->two_primaries
    + && (new_conf->wire_protocol != DRBD_PROT_C)) {
    + retcode = ERR_NOT_PROTO_C;
    + goto fail;
    + };
    +
    + if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
    + retcode = ERR_DISCARD;
    + goto fail;
    + }
    +
    + retcode = NO_ERROR;
    +
    + new_my_addr = (struct sockaddr *)&new_conf->my_addr;
    + new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
    + for (i = 0; i < minor_count; i++) {
    + odev = minor_to_mdev(i);
    + if (!odev || odev == mdev)
    + continue;
    + if (get_net_conf(odev)) {
    + taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
    + if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
    + !memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
    + retcode = ERR_LOCAL_ADDR;
    +
    + taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
    + if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
    + !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
    + retcode = ERR_PEER_ADDR;
    +
    + put_net_conf(odev);
    + if (retcode != NO_ERROR)
    + goto fail;
    + }
    + }
    +
    + if (new_conf->cram_hmac_alg[0] != 0) {
    + snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
    + new_conf->cram_hmac_alg);
    + tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
    + if (IS_ERR(tfm)) {
    + tfm = NULL;
    + retcode = ERR_AUTH_ALG;
    + goto fail;
    + }
    +
    + if (crypto_tfm_alg_type(crypto_hash_tfm(tfm))
    + != CRYPTO_ALG_TYPE_HASH) {
    + retcode = ERR_AUTH_ALG_ND;
    + goto fail;
    + }
    + }
    +
    + if (new_conf->integrity_alg[0]) {
    + integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
    + if (IS_ERR(integrity_w_tfm)) {
    + integrity_w_tfm = NULL;
    + retcode=ERR_INTEGRITY_ALG;
    + goto fail;
    + }
    +
    + if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
    + retcode=ERR_INTEGRITY_ALG_ND;
    + goto fail;
    + }
    +
    + integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
    + if (IS_ERR(integrity_r_tfm)) {
    + integrity_r_tfm = NULL;
    + retcode=ERR_INTEGRITY_ALG;
    + goto fail;
    + }
    + }
    +
    + ns = new_conf->max_epoch_size/8;
    + if (mdev->tl_hash_s != ns) {
    + new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
    + if (!new_tl_hash) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + }
    +
    + ns = new_conf->max_buffers/8;
    + if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
    + new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
    + if (!new_ee_hash) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + }
    +
    + ((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
    +
    + if (integrity_w_tfm) {
    + i = crypto_hash_digestsize(integrity_w_tfm);
    + int_dig_out = kmalloc(i, GFP_KERNEL);
    + if (!int_dig_out) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + int_dig_in = kmalloc(i, GFP_KERNEL);
    + if (!int_dig_in) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + int_dig_vv = kmalloc(i, GFP_KERNEL);
    + if (!int_dig_vv) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + }
    +
    + if (!mdev->bitmap) {
    + if(drbd_bm_init(mdev)) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + }
    +
    + spin_lock_irq(&mdev->req_lock);
    + if (mdev->net_conf != NULL) {
    + retcode = ERR_NET_CONFIGURED;
    + spin_unlock_irq(&mdev->req_lock);
    + goto fail;
    + }
    + mdev->net_conf = new_conf;
    +
    + mdev->send_cnt = 0;
    + mdev->recv_cnt = 0;
    +
    + if (new_tl_hash) {
    + kfree(mdev->tl_hash);
    + mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
    + mdev->tl_hash = new_tl_hash;
    + }
    +
    + if (new_ee_hash) {
    + kfree(mdev->ee_hash);
    + mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
    + mdev->ee_hash = new_ee_hash;
    + }
    +
    + crypto_free_hash(mdev->cram_hmac_tfm);
    + mdev->cram_hmac_tfm = tfm;
    +
    + crypto_free_hash(mdev->integrity_w_tfm);
    + mdev->integrity_w_tfm = integrity_w_tfm;
    +
    + crypto_free_hash(mdev->integrity_r_tfm);
    + mdev->integrity_r_tfm = integrity_r_tfm;
    +
    + kfree(mdev->int_dig_out);
    + kfree(mdev->int_dig_in);
    + kfree(mdev->int_dig_vv);
    + mdev->int_dig_out=int_dig_out;
    + mdev->int_dig_in=int_dig_in;
    + mdev->int_dig_vv=int_dig_vv;
    + spin_unlock_irq(&mdev->req_lock);
    +
    + retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
    +
    + kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
    + reply->ret_code = retcode;
    + drbd_reconfig_done(mdev);
    + return 0;
    +
    +fail:
    + kfree(int_dig_out);
    + kfree(int_dig_in);
    + kfree(int_dig_vv);
    + crypto_free_hash(tfm);
    + crypto_free_hash(integrity_w_tfm);
    + crypto_free_hash(integrity_r_tfm);
    + kfree(new_tl_hash);
    + kfree(new_ee_hash);
    + kfree(new_conf);
    +
    + reply->ret_code = retcode;
    + drbd_reconfig_done(mdev);
    + return 0;
    +}
    +
    +static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int retcode;
    +
    + retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
    +
    + if (retcode == SS_NOTHING_TO_DO)
    + goto done;
    + else if (retcode == SS_ALREADY_STANDALONE)
    + goto done;
    + else if (retcode == SS_PRIMARY_NOP) {
    + /* Our statche checking code wants to see the peer outdated. */
    + retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
    + pdsk, D_OUTDATED));
    + } else if (retcode == SS_CW_FAILED_BY_PEER) {
    + /* The peer probabely wants to see us outdated. */
    + retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
    + disk, D_OUTDATED),
    + CS_ORDERED);
    + if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
    + drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
    + retcode = SS_SUCCESS;
    + }
    + }
    +
    + if (retcode < SS_SUCCESS)
    + goto fail;
    +
    + if (wait_event_interruptible(mdev->state_wait,
    + mdev->state.conn != C_DISCONNECTING)) {
    + /* Do not test for mdev->state.conn == C_STANDALONE, since
    + someone else might connect us in the mean time! */
    + retcode = ERR_INTR;
    + goto fail;
    + }
    +
    + done:
    + retcode = NO_ERROR;
    + fail:
    + drbd_md_sync(mdev);
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +void resync_after_online_grow(struct drbd_conf *mdev)
    +{
    + int iass; /* I am sync source */
    +
    + dev_info(DEV, "Resync of new storage after online grow\n");
    + if (mdev->state.role != mdev->state.peer)
    + iass = (mdev->state.role == R_PRIMARY);
    + else
    + iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
    +
    + if (iass)
    + drbd_start_resync(mdev, C_SYNC_SOURCE);
    + else
    + _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
    +}
    +
    +static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + struct resize rs;
    + int retcode = NO_ERROR;
    + int ldsc = 0; /* local disk size changed */
    + enum determine_dev_size dd;
    +
    + memset(&rs, 0, sizeof(struct resize));
    + if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
    + retcode = ERR_MANDATORY_TAG;
    + goto fail;
    + }
    +
    + if (mdev->state.conn > C_CONNECTED) {
    + retcode = ERR_RESIZE_RESYNC;
    + goto fail;
    + }
    +
    + if (mdev->state.role == R_SECONDARY &&
    + mdev->state.peer == R_SECONDARY) {
    + retcode = ERR_NO_PRIMARY;
    + goto fail;
    + }
    +
    + if (!get_ldev(mdev)) {
    + retcode = ERR_NO_DISK;
    + goto fail;
    + }
    +
    + if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev)) {
    + mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
    + ldsc = 1;
    + }
    +
    + mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
    + dd = drbd_determin_dev_size(mdev);
    + drbd_md_sync(mdev);
    + put_ldev(mdev);
    + if (dd == dev_size_error) {
    + retcode = ERR_NOMEM_BITMAP;
    + goto fail;
    + }
    +
    + if (mdev->state.conn == C_CONNECTED && (dd != unchanged || ldsc)) {
    + if (dd == grew)
    + set_bit(RESIZE_PENDING, &mdev->flags);
    +
    + drbd_send_uuids(mdev);
    + drbd_send_sizes(mdev, 1);
    + }
    +
    + fail:
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int retcode = NO_ERROR;
    + int err;
    + int ovr; /* online verify running */
    + int rsr; /* re-sync running */
    + struct crypto_hash *verify_tfm = NULL;
    + struct crypto_hash *csums_tfm = NULL;
    + struct syncer_conf sc;
    + cpumask_t n_cpu_mask = CPU_MASK_NONE;
    +
    + memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
    +
    + if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
    + memset(&sc, 0, sizeof(struct syncer_conf));
    + sc.rate = DRBD_RATE_DEF;
    + sc.after = DRBD_AFTER_DEF;
    + sc.al_extents = DRBD_AL_EXTENTS_DEF;
    + }
    +
    + if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
    + retcode = ERR_MANDATORY_TAG;
    + goto fail;
    + }
    +
    + /* re-sync running */
    + rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
    + mdev->state.conn == C_SYNC_TARGET ||
    + mdev->state.conn == C_PAUSED_SYNC_S ||
    + mdev->state.conn == C_PAUSED_SYNC_T );
    +
    + if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
    + retcode = ERR_CSUMS_RESYNC_RUNNING;
    + goto fail;
    + }
    +
    + if (!rsr && sc.csums_alg[0]) {
    + csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
    + if (IS_ERR(csums_tfm)) {
    + csums_tfm = NULL;
    + retcode = ERR_CSUMS_ALG;
    + goto fail;
    + }
    +
    + if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
    + retcode = ERR_CSUMS_ALG_ND;
    + goto fail;
    + }
    + }
    +
    + /* online verify running */
    + ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
    +
    + if (ovr) {
    + if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
    + retcode = ERR_VERIFY_RUNNING;
    + goto fail;
    + }
    + }
    +
    + if (!ovr && sc.verify_alg[0]) {
    + verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
    + if (IS_ERR(verify_tfm)) {
    + verify_tfm = NULL;
    + retcode = ERR_VERIFY_ALG;
    + goto fail;
    + }
    +
    + if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
    + retcode = ERR_VERIFY_ALG_ND;
    + goto fail;
    + }
    + }
    +
    + /* silently ignore cpu mask on UP kernel */
    + if (NR_CPUS > 1 && sc.cpu_mask[0] != 0) {
    + err = __bitmap_parse(sc.cpu_mask, 32, 0, (unsigned long *)&n_cpu_mask, NR_CPUS);
    + if (err) {
    + dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
    + retcode = ERR_CPU_MASK_PARSE;
    + goto fail;
    + }
    + }
    +
    + ERR_IF (sc.rate < 1) sc.rate = 1;
    + ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
    +#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
    + if (sc.al_extents > AL_MAX) {
    + dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
    + sc.al_extents = AL_MAX;
    + }
    +#undef AL_MAX
    +
    + /* most sanity checks done, try to assign the new sync-after
    + * dependency. need to hold the global lock in there,
    + * to avoid a race in the dependency loop check. */
    + retcode = drbd_alter_sa(mdev, sc.after);
    + if (retcode != NO_ERROR)
    + goto fail;
    +
    + /* ok, assign the rest of it as well.
    + * lock against receive_SyncParam() */
    + spin_lock(&mdev->peer_seq_lock);
    + mdev->sync_conf = sc;
    +
    + if (!rsr) {
    + crypto_free_hash(mdev->csums_tfm);
    + mdev->csums_tfm = csums_tfm;
    + csums_tfm = NULL;
    + }
    +
    + if (!ovr) {
    + crypto_free_hash(mdev->verify_tfm);
    + mdev->verify_tfm = verify_tfm;
    + verify_tfm = NULL;
    + }
    + spin_unlock(&mdev->peer_seq_lock);
    +
    + if (get_ldev(mdev)) {
    + wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
    + drbd_al_shrink(mdev);
    + err = drbd_check_al_size(mdev);
    + lc_unlock(mdev->act_log);
    + wake_up(&mdev->al_wait);
    +
    + put_ldev(mdev);
    + drbd_md_sync(mdev);
    +
    + if (err) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + }
    +
    + if (mdev->state.conn >= C_CONNECTED)
    + drbd_send_sync_param(mdev, &sc);
    +
    + if (!cpus_equal(mdev->cpu_mask, n_cpu_mask)) {
    + mdev->cpu_mask = n_cpu_mask;
    + mdev->cpu_mask = drbd_calc_cpu_mask(mdev);
    + mdev->receiver.reset_cpu_mask = 1;
    + mdev->asender.reset_cpu_mask = 1;
    + mdev->worker.reset_cpu_mask = 1;
    + }
    +
    + kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
    +fail:
    + crypto_free_hash(csums_tfm);
    + crypto_free_hash(verify_tfm);
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int retcode;
    +
    + retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
    +
    + if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
    + retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
    +
    + while (retcode == SS_NEED_CONNECTION) {
    + spin_lock_irq(&mdev->req_lock);
    + if (mdev->state.conn < C_CONNECTED)
    + retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
    + spin_unlock_irq(&mdev->req_lock);
    +
    + if (retcode != SS_NEED_CONNECTION)
    + break;
    +
    + retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
    + }
    +
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    +
    + reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
    +
    + return 0;
    +}
    +
    +static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int retcode = NO_ERROR;
    +
    + if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
    + retcode = ERR_PAUSE_IS_SET;
    +
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int retcode = NO_ERROR;
    +
    + if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
    + retcode = ERR_PAUSE_IS_CLEAR;
    +
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
    +
    + return 0;
    +}
    +
    +static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
    + return 0;
    +}
    +
    +static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
    + return 0;
    +}
    +
    +static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + unsigned short *tl;
    +
    + tl = reply->tag_list;
    +
    + if (get_ldev(mdev)) {
    + tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
    + put_ldev(mdev);
    + }
    +
    + if (get_net_conf(mdev)) {
    + tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
    + put_net_conf(mdev);
    + }
    + tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
    +
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + return (int)((char *)tl - (char *)reply->tag_list);
    +}
    +
    +static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + unsigned short *tl = reply->tag_list;
    + union drbd_state s = mdev->state;
    + unsigned long rs_left;
    + unsigned int res;
    +
    + tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
    +
    + /* no local ref, no bitmap, no syncer progress. */
    + if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
    + if (get_ldev(mdev)) {
    + drbd_get_syncer_progress(mdev, &rs_left, &res);
    + tl = tl_add_int(tl, T_sync_progress, &res);
    + put_ldev(mdev);
    + }
    + }
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + return (int)((char *)tl - (char *)reply->tag_list);
    +}
    +
    +static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + unsigned short *tl;
    +
    + tl = reply->tag_list;
    +
    + if (get_ldev(mdev)) {
    + tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
    + tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
    + put_ldev(mdev);
    + }
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + return (int)((char *)tl - (char *)reply->tag_list);
    +}
    +
    +/**
    + * drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
    + * @mdev: DRBD device.
    + * @nlp: Netlink/connector packet from drbdsetup
    + * @reply: Reply packet for drbdsetup
    + */
    +static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + unsigned short *tl;
    + char rv;
    +
    + tl = reply->tag_list;
    +
    + rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
    + test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
    +
    + tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + return (int)((char *)tl - (char *)reply->tag_list);
    +}
    +
    +static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + /* default to resume from last known position, if possible */
    + struct start_ov args =
    + { .start_sector = mdev->ov_start_sector };
    +
    + if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
    + reply->ret_code = ERR_MANDATORY_TAG;
    + return 0;
    + }
    + /* w_make_ov_request expects position to be aligned */
    + mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
    + reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
    + return 0;
    +}
    +
    +
    +static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
    + struct drbd_nl_cfg_reply *reply)
    +{
    + int retcode = NO_ERROR;
    + int skip_initial_sync = 0;
    + int err;
    +
    + struct new_c_uuid args;
    +
    + memset(&args, 0, sizeof(struct new_c_uuid));
    + if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
    + reply->ret_code = ERR_MANDATORY_TAG;
    + return 0;
    + }
    +
    + mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
    +
    + if (!get_ldev(mdev)) {
    + retcode = ERR_NO_DISK;
    + goto out;
    + }
    +
    + /* this is "skip initial sync", assume to be clean */
    + if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
    + mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
    + dev_info(DEV, "Preparing to skip initial sync\n");
    + skip_initial_sync = 1;
    + } else if (mdev->state.conn != C_STANDALONE) {
    + retcode = ERR_CONNECTED;
    + goto out_dec;
    + }
    +
    + drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
    + drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
    +
    + if (args.clear_bm) {
    + err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
    + if (err) {
    + dev_err(DEV, "Writing bitmap failed with %d\n",err);
    + retcode = ERR_IO_MD_DISK;
    + }
    + if (skip_initial_sync) {
    + drbd_send_uuids_skip_initial_sync(mdev);
    + _drbd_uuid_set(mdev, UI_BITMAP, 0);
    + spin_lock_irq(&mdev->req_lock);
    + _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
    + CS_VERBOSE, NULL);
    + spin_unlock_irq(&mdev->req_lock);
    + }
    + }
    +
    + drbd_md_sync(mdev);
    +out_dec:
    + put_ldev(mdev);
    +out:
    + mutex_unlock(&mdev->state_mutex);
    +
    + reply->ret_code = retcode;
    + return 0;
    +}
    +
    +static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
    +{
    + struct drbd_conf *mdev;
    +
    + if (nlp->drbd_minor >= minor_count)
    + return NULL;
    +
    + mdev = minor_to_mdev(nlp->drbd_minor);
    +
    + if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
    + struct gendisk *disk = NULL;
    + mdev = drbd_new_device(nlp->drbd_minor);
    +
    + spin_lock_irq(&drbd_pp_lock);
    + if (minor_table[nlp->drbd_minor] == NULL) {
    + minor_table[nlp->drbd_minor] = mdev;
    + disk = mdev->vdisk;
    + mdev = NULL;
    + } /* else: we lost the race */
    + spin_unlock_irq(&drbd_pp_lock);
    +
    + if (disk) /* we won the race above */
    + /* in case we ever add a drbd_delete_device(),
    + * don't forget the del_gendisk! */
    + add_disk(disk);
    + else /* we lost the race above */
    + drbd_free_mdev(mdev);
    +
    + mdev = minor_to_mdev(nlp->drbd_minor);
    + }
    +
    + return mdev;
    +}
    +
    +struct cn_handler_struct {
    + int (*function)(struct drbd_conf *,
    + struct drbd_nl_cfg_req *,
    + struct drbd_nl_cfg_reply *);
    + int reply_body_size;
    +};
    +
    +static struct cn_handler_struct cnd_table[] = {
    + [ P_primary ] = { &drbd_nl_primary, 0 },
    + [ P_secondary ] = { &drbd_nl_secondary, 0 },
    + [ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
    + [ P_detach ] = { &drbd_nl_detach, 0 },
    + [ P_net_conf ] = { &drbd_nl_net_conf, 0 },
    + [ P_disconnect ] = { &drbd_nl_disconnect, 0 },
    + [ P_resize ] = { &drbd_nl_resize, 0 },
    + [ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
    + [ P_invalidate ] = { &drbd_nl_invalidate, 0 },
    + [ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
    + [ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
    + [ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
    + [ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
    + [ P_resume_io ] = { &drbd_nl_resume_io, 0 },
    + [ P_outdate ] = { &drbd_nl_outdate, 0 },
    + [ P_get_config ] = { &drbd_nl_get_config,
    + sizeof(struct syncer_conf_tag_len_struct) +
    + sizeof(struct disk_conf_tag_len_struct) +
    + sizeof(struct net_conf_tag_len_struct) },
    + [ P_get_state ] = { &drbd_nl_get_state,
    + sizeof(struct get_state_tag_len_struct) +
    + sizeof(struct sync_progress_tag_len_struct) },
    + [ P_get_uuids ] = { &drbd_nl_get_uuids,
    + sizeof(struct get_uuids_tag_len_struct) },
    + [ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
    + sizeof(struct get_timeout_flag_tag_len_struct)},
    + [ P_start_ov ] = { &drbd_nl_start_ov, 0 },
    + [ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
    +};
    +
    +static void drbd_connector_callback(void *data)
    +{
    + struct cn_msg *req = data;
    + struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
    + struct cn_handler_struct *cm;
    + struct cn_msg *cn_reply;
    + struct drbd_nl_cfg_reply *reply;
    + struct drbd_conf *mdev;
    + int retcode, rr;
    + int reply_size = sizeof(struct cn_msg)
    + + sizeof(struct drbd_nl_cfg_reply)
    + + sizeof(short int);
    +
    + if (!try_module_get(THIS_MODULE)) {
    + printk(KERN_ERR "drbd: try_module_get() failed!\n");
    + return;
    + }
    +
    + mdev = ensure_mdev(nlp);
    + if (!mdev) {
    + retcode = ERR_MINOR_INVALID;
    + goto fail;
    + }
    +
    + trace_drbd_netlink(data, 1);
    +
    + if (nlp->packet_type >= P_nl_after_last_packet) {
    + retcode = ERR_PACKET_NR;
    + goto fail;
    + }
    +
    + cm = cnd_table + nlp->packet_type;
    +
    + /* This may happen if packet number is 0: */
    + if (cm->function == NULL) {
    + retcode = ERR_PACKET_NR;
    + goto fail;
    + }
    +
    + reply_size += cm->reply_body_size;
    +
    + /* allocation not in the IO path, cqueue thread context */
    + cn_reply = kmalloc(reply_size, GFP_KERNEL);
    + if (!cn_reply) {
    + retcode = ERR_NOMEM;
    + goto fail;
    + }
    + reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
    +
    + reply->packet_type =
    + cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
    + reply->minor = nlp->drbd_minor;
    + reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
    + /* reply->tag_list; might be modified by cm->fucntion. */
    +
    + rr = cm->function(mdev, nlp, reply);
    +
    + cn_reply->id = req->id;
    + cn_reply->seq = req->seq;
    + cn_reply->ack = req->ack + 1;
    + cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
    + cn_reply->flags = 0;
    +
    + trace_drbd_netlink(cn_reply, 0);
    + rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
    + if (rr && rr != -ESRCH)
    + printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
    +
    + kfree(cn_reply);
    + module_put(THIS_MODULE);
    + return;
    + fail:
    + drbd_nl_send_reply(req, retcode);
    + module_put(THIS_MODULE);
    +}
    +
    +static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
    +
    +static unsigned short *
    +__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
    + unsigned short len, int nul_terminated)
    +{
    + unsigned short l = tag_descriptions[tag_number(tag)].max_len;
    + len = (len < l) ? len : l;
    + put_unaligned(tag, tl++);
    + put_unaligned(len, tl++);
    + memcpy(tl, data, len);
    + tl = (unsigned short*)((char*)tl + len);
    + if (nul_terminated)
    + *((char*)tl - 1) = 0;
    + return tl;
    +}
    +
    +static unsigned short *
    +tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
    +{
    + return __tl_add_blob(tl, tag, data, len, 0);
    +}
    +
    +static unsigned short *
    +tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
    +{
    + return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
    +}
    +
    +static unsigned short *
    +tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
    +{
    + put_unaligned(tag, tl++);
    + switch(tag_type(tag)) {
    + case TT_INTEGER:
    + put_unaligned(sizeof(int), tl++);
    + put_unaligned(*(int *)val, (int *)tl++);
    + tl = (unsigned short*)((char*)tl+sizeof(int));
    + break;
    + case TT_INT64:
    + put_unaligned(sizeof(u64), tl++);
    + put_unaligned(*(u64 *)val, (u64 *)tl++);
    + tl = (unsigned short*)((char*)tl+sizeof(u64));
    + break;
    + default:
    + /* someone did something stupid. */
    + ;
    + }
    + return tl;
    +}
    +
    +void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
    +{
    + char buffer[sizeof(struct cn_msg)+
    + sizeof(struct drbd_nl_cfg_reply)+
    + sizeof(struct get_state_tag_len_struct)+
    + sizeof(short int)];
    + struct cn_msg *cn_reply = (struct cn_msg *) buffer;
    + struct drbd_nl_cfg_reply *reply =
    + (struct drbd_nl_cfg_reply *)cn_reply->data;
    + unsigned short *tl = reply->tag_list;
    +
    + /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
    +
    + tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
    +
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + cn_reply->id.idx = CN_IDX_DRBD;
    + cn_reply->id.val = CN_VAL_DRBD;
    +
    + cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
    + cn_reply->ack = 0; /* not used here. */
    + cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
    + (int)((char *)tl - (char *)reply->tag_list);
    + cn_reply->flags = 0;
    +
    + reply->packet_type = P_get_state;
    + reply->minor = mdev_to_minor(mdev);
    + reply->ret_code = NO_ERROR;
    +
    + trace_drbd_netlink(cn_reply, 0);
    + cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
    +}
    +
    +void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
    +{
    + char buffer[sizeof(struct cn_msg)+
    + sizeof(struct drbd_nl_cfg_reply)+
    + sizeof(struct call_helper_tag_len_struct)+
    + sizeof(short int)];
    + struct cn_msg *cn_reply = (struct cn_msg *) buffer;
    + struct drbd_nl_cfg_reply *reply =
    + (struct drbd_nl_cfg_reply *)cn_reply->data;
    + unsigned short *tl = reply->tag_list;
    +
    + /* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
    +
    + tl = tl_add_str(tl, T_helper, helper_name);
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + cn_reply->id.idx = CN_IDX_DRBD;
    + cn_reply->id.val = CN_VAL_DRBD;
    +
    + cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
    + cn_reply->ack = 0; /* not used here. */
    + cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
    + (int)((char *)tl - (char *)reply->tag_list);
    + cn_reply->flags = 0;
    +
    + reply->packet_type = P_call_helper;
    + reply->minor = mdev_to_minor(mdev);
    + reply->ret_code = NO_ERROR;
    +
    + trace_drbd_netlink(cn_reply, 0);
    + cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
    +}
    +
    +void drbd_bcast_ee(struct drbd_conf *mdev,
    + const char *reason, const int dgs,
    + const char* seen_hash, const char* calc_hash,
    + const struct drbd_epoch_entry* e)
    +{
    + struct cn_msg *cn_reply;
    + struct drbd_nl_cfg_reply *reply;
    + struct bio_vec *bvec;
    + unsigned short *tl;
    + int i;
    +
    + if (!e)
    + return;
    + if (!reason || !reason[0])
    + return;
    +
    + /* aparently we have to memcpy twice, first to prepare the data for the
    + * struct cn_msg, then within cn_netlink_send from the cn_msg to the
    + * netlink skb. */
    + /* receiver thread context, which is not in the writeout path (of this node),
    + * but may be in the writeout path of the _other_ node.
    + * GFP_NOIO to avoid potential "distributed deadlock". */
    + cn_reply = kmalloc(
    + sizeof(struct cn_msg)+
    + sizeof(struct drbd_nl_cfg_reply)+
    + sizeof(struct dump_ee_tag_len_struct)+
    + sizeof(short int),
    + GFP_NOIO);
    +
    + if (!cn_reply) {
    + dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
    + (unsigned long long)e->sector, e->size);
    + return;
    + }
    +
    + reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
    + tl = reply->tag_list;
    +
    + tl = tl_add_str(tl, T_dump_ee_reason, reason);
    + tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
    + tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
    + tl = tl_add_int(tl, T_ee_sector, &e->sector);
    + tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
    +
    + put_unaligned(T_ee_data, tl++);
    + put_unaligned(e->size, tl++);
    +
    + __bio_for_each_segment(bvec, e->private_bio, i, 0) {
    + void *d = kmap(bvec->bv_page);
    + memcpy(tl, d + bvec->bv_offset, bvec->bv_len);
    + kunmap(bvec->bv_page);
    + tl=(unsigned short*)((char*)tl + bvec->bv_len);
    + }
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + cn_reply->id.idx = CN_IDX_DRBD;
    + cn_reply->id.val = CN_VAL_DRBD;
    +
    + cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
    + cn_reply->ack = 0; // not used here.
    + cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
    + (int)((char*)tl - (char*)reply->tag_list);
    + cn_reply->flags = 0;
    +
    + reply->packet_type = P_dump_ee;
    + reply->minor = mdev_to_minor(mdev);
    + reply->ret_code = NO_ERROR;
    +
    + trace_drbd_netlink(cn_reply, 0);
    + cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
    + kfree(cn_reply);
    +}
    +
    +void drbd_bcast_sync_progress(struct drbd_conf *mdev)
    +{
    + char buffer[sizeof(struct cn_msg)+
    + sizeof(struct drbd_nl_cfg_reply)+
    + sizeof(struct sync_progress_tag_len_struct)+
    + sizeof(short int)];
    + struct cn_msg *cn_reply = (struct cn_msg *) buffer;
    + struct drbd_nl_cfg_reply *reply =
    + (struct drbd_nl_cfg_reply *)cn_reply->data;
    + unsigned short *tl = reply->tag_list;
    + unsigned long rs_left;
    + unsigned int res;
    +
    + /* no local ref, no bitmap, no syncer progress, no broadcast. */
    + if (!get_ldev(mdev))
    + return;
    + drbd_get_syncer_progress(mdev, &rs_left, &res);
    + put_ldev(mdev);
    +
    + tl = tl_add_int(tl, T_sync_progress, &res);
    + put_unaligned(TT_END, tl++); /* Close the tag list */
    +
    + cn_reply->id.idx = CN_IDX_DRBD;
    + cn_reply->id.val = CN_VAL_DRBD;
    +
    + cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
    + cn_reply->ack = 0; /* not used here. */
    + cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
    + (int)((char *)tl - (char *)reply->tag_list);
    + cn_reply->flags = 0;
    +
    + reply->packet_type = P_sync_progress;
    + reply->minor = mdev_to_minor(mdev);
    + reply->ret_code = NO_ERROR;
    +
    + trace_drbd_netlink(cn_reply, 0);
    + cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
    +}
    +
    +int __init drbd_nl_init(void)
    +{
    + static struct cb_id cn_id_drbd;
    + int err, try=10;
    +
    + cn_id_drbd.val = CN_VAL_DRBD;
    + do {
    + cn_id_drbd.idx = cn_idx;
    + err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
    + if (!err)
    + break;
    + cn_idx = (cn_idx + CN_IDX_STEP);
    + } while (try--);
    +
    + if (err) {
    + printk(KERN_ERR "drbd: cn_drbd failed to register\n");
    + return err;
    + }
    +
    + return 0;
    +}
    +
    +void drbd_nl_cleanup(void)
    +{
    + static struct cb_id cn_id_drbd;
    +
    + cn_id_drbd.idx = cn_idx;
    + cn_id_drbd.val = CN_VAL_DRBD;
    +
    + cn_del_callback(&cn_id_drbd);
    +}
    +
    +void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
    +{
    + char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
    + struct cn_msg *cn_reply = (struct cn_msg *) buffer;
    + struct drbd_nl_cfg_reply *reply =
    + (struct drbd_nl_cfg_reply *)cn_reply->data;
    + int rr;
    +
    + cn_reply->id = req->id;
    +
    + cn_reply->seq = req->seq;
    + cn_reply->ack = req->ack + 1;
    + cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
    + cn_reply->flags = 0;
    +
    + reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
    + reply->ret_code = ret_code;
    +
    + trace_drbd_netlink(cn_reply, 0);
    + rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
    + if (rr && rr != -ESRCH)
    + printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
    +}
    +

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      Last update: 2009-07-06 17:47    [W:0.195 / U:0.656 seconds]
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