[fs/lustre-release.git] / lustre / include / lustre / lustre_idl.h

/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program 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 version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2016, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/include/lustre/lustre_idl.h
 *
 * Lustre wire protocol definitions.
 */

/** \defgroup lustreidl lustreidl
 *
 * Lustre wire protocol definitions.
 *
 * ALL structs passing over the wire should be declared here.  Structs
 * that are used in interfaces with userspace should go in lustre_user.h.
 *
 * All structs being declared here should be built from simple fixed-size
 * types (__u8, __u16, __u32, __u64) or be built from other types or
 * structs also declared in this file.  Similarly, all flags and magic
 * values in those structs should also be declared here.  This ensures
 * that the Lustre wire protocol is not influenced by external dependencies.
 *
 * The only other acceptable items in this file are VERY SIMPLE accessor
 * functions to avoid callers grubbing inside the structures. Nothing that
 * depends on external functions or definitions should be in here.
 *
 * Structs must be properly aligned to put 64-bit values on an 8-byte
 * boundary.  Any structs being added here must also be added to
 * utils/wirecheck.c and "make newwiretest" run to regenerate the
 * utils/wiretest.c sources.  This allows us to verify that wire structs
 * have the proper alignment/size on all architectures.
 *
 * DO NOT CHANGE any of the structs, flags, values declared here and used
 * in released Lustre versions.  Some structs may have padding fields that
 * can be used.  Some structs might allow addition at the end (verify this
 * in the code to ensure that new/old clients that see this larger struct
 * do not fail, otherwise you need to implement protocol compatibility).
 *
 * @{
 */

#ifndef _LUSTRE_IDL_H_
#define _LUSTRE_IDL_H_

#include <asm/byteorder.h>
#include <linux/types.h>

#include <lnet/types.h>
#include <lustre/lustre_user.h> /* Defn's shared with user-space. */
#include <lustre_ver.h>

/*
 *  GENERAL STUFF
 */
/* FOO_REQUEST_PORTAL is for incoming requests on the FOO
 * FOO_REPLY_PORTAL   is for incoming replies on the FOO
 * FOO_BULK_PORTAL    is for incoming bulk on the FOO
 */

#define CONNMGR_REQUEST_PORTAL          1
#define CONNMGR_REPLY_PORTAL            2
//#define OSC_REQUEST_PORTAL            3
#define OSC_REPLY_PORTAL                4
//#define OSC_BULK_PORTAL               5
#define OST_IO_PORTAL                   6
#define OST_CREATE_PORTAL               7
#define OST_BULK_PORTAL                 8
//#define MDC_REQUEST_PORTAL            9
#define MDC_REPLY_PORTAL               10
//#define MDC_BULK_PORTAL              11
#define MDS_REQUEST_PORTAL             12
//#define MDS_REPLY_PORTAL             13
#define MDS_BULK_PORTAL                14
#define LDLM_CB_REQUEST_PORTAL         15
#define LDLM_CB_REPLY_PORTAL           16
#define LDLM_CANCEL_REQUEST_PORTAL     17
#define LDLM_CANCEL_REPLY_PORTAL       18
//#define PTLBD_REQUEST_PORTAL           19
//#define PTLBD_REPLY_PORTAL             20
//#define PTLBD_BULK_PORTAL              21
#define MDS_SETATTR_PORTAL             22
#define MDS_READPAGE_PORTAL            23
#define OUT_PORTAL                      24
#define MGC_REPLY_PORTAL               25
#define MGS_REQUEST_PORTAL             26
#define MGS_REPLY_PORTAL               27
#define OST_REQUEST_PORTAL             28
#define FLD_REQUEST_PORTAL             29
#define SEQ_METADATA_PORTAL            30
#define SEQ_DATA_PORTAL                31
#define SEQ_CONTROLLER_PORTAL          32
#define MGS_BULK_PORTAL                33

/* Portal 63 is reserved for the Cray Inc DVS - nic@cray.com, roe@cray.com, n8851@cray.com */

/* packet types */
#define PTL_RPC_MSG_REQUEST 4711
#define PTL_RPC_MSG_ERR     4712
#define PTL_RPC_MSG_REPLY   4713

/* DON'T use swabbed values of MAGIC as magic! */
#define LUSTRE_MSG_MAGIC_V2 0x0BD00BD3
#define LUSTRE_MSG_MAGIC_V2_SWABBED 0xD30BD00B

#define LUSTRE_MSG_MAGIC LUSTRE_MSG_MAGIC_V2

#define PTLRPC_MSG_VERSION  0x00000003
#define LUSTRE_VERSION_MASK 0xffff0000
#define LUSTRE_OBD_VERSION  0x00010000
#define LUSTRE_MDS_VERSION  0x00020000
#define LUSTRE_OST_VERSION  0x00030000
#define LUSTRE_DLM_VERSION  0x00040000
#define LUSTRE_LOG_VERSION  0x00050000
#define LUSTRE_MGS_VERSION  0x00060000

/**
 * Describes a range of sequence, lsr_start is included but lsr_end is
 * not in the range.
 * Same structure is used in fld module where lsr_index field holds mdt id
 * of the home mdt.
 */
struct lu_seq_range {
        __u64 lsr_start;
        __u64 lsr_end;
        __u32 lsr_index;
        __u32 lsr_flags;
};

struct lu_seq_range_array {
        __u32 lsra_count;
        __u32 lsra_padding;
        struct lu_seq_range lsra_lsr[0];
};

#define LU_SEQ_RANGE_MDT        0x0
#define LU_SEQ_RANGE_OST        0x1
#define LU_SEQ_RANGE_ANY        0x3

#define LU_SEQ_RANGE_MASK       0x3

/** \defgroup lu_fid lu_fid
 * @{ */

extern void lustre_lma_swab(struct lustre_mdt_attrs *lma);
extern void lustre_lma_init(struct lustre_mdt_attrs *lma,
                            const struct lu_fid *fid,
                            __u32 compat, __u32 incompat);
extern void lustre_loa_swab(struct lustre_ost_attrs *loa,
                            bool to_cpu);
extern void lustre_loa_init(struct lustre_ost_attrs *loa,
                            const struct lu_fid *fid,
                            __u32 compat, __u32 incompat);

/* copytool uses a 32b bitmask field to encode archive-Ids during register
 * with MDT thru kuc.
 * archive num = 0 => all
 * archive num from 1 to 32
 */
#define LL_HSM_MAX_ARCHIVE (sizeof(__u32) * 8)

/**
 * HSM on-disk attributes stored in a separate xattr.
 */
struct hsm_attrs {
        /** Bitfield for supported data in this structure. For future use. */
        __u32   hsm_compat;

        /** HSM flags, see hsm_flags enum below */
        __u32   hsm_flags;
        /** backend archive id associated with the file */
        __u64   hsm_arch_id;
        /** version associated with the last archiving, if any */
        __u64   hsm_arch_ver;
};
extern void lustre_hsm_swab(struct hsm_attrs *attrs);

/**
 * fid constants
 */
enum {
        /** LASTID file has zero OID */
        LUSTRE_FID_LASTID_OID = 0UL,
        /** initial fid id value */
        LUSTRE_FID_INIT_OID  = 1UL
};

/**
 * Different FID Format
 * http://arch.lustre.org/index.php?title=Interoperability_fids_zfs#NEW.0
 *
 * FID:
 * File IDentifier generated by client from range allocated by the seq service.
 * First 0x400 sequences [2^33, 2^33 + 0x400] are reserved for system use. Note
 * that on ldiskfs MDTs that IGIF FIDs can use inode numbers starting at 12,
 * but this is in the IGIF SEQ rangeand does not conflict with assigned FIDs.
 *
 * IGIF:
 * Inode and Generation In FID, a surrogate FID used to globally identify an
 * existing object on OLD formatted MDT file system. This would only be used on
 * MDT0 in a DNE filesystem, because there are not expected to be any OLD
 * formatted DNE filesystems. Belongs to a sequence in [12, 2^32 - 1] range,
 * where sequence number is inode number, and inode generation is used as OID.
 * NOTE: This assumes no more than 2^32-1 inodes exist in the MDT filesystem,
 * which is the maximum possible for an ldiskfs backend. NOTE: This assumes
 * that the reserved ext3/ext4/ldiskfs inode numbers [0-11] are never visible
 * to clients, which has always been true.
 *
 * IDIF:
 * Object ID in FID, a surrogate FID used to globally identify an existing
 * object on OLD formatted OST file system. Belongs to a sequence in
 * [2^32, 2^33 - 1]. Sequence number is calculated as:
 *      1 << 32 | (ost_index << 16) | ((objid >> 32) & 0xffff)
 * that is, SEQ consists of 16-bit OST index, and higher 16 bits of object ID.
 * The generation of unique SEQ values per OST allows the IDIF FIDs to be
 * identified in the FLD correctly. The OID field is calculated as:
 *      objid & 0xffffffff
 * that is, it consists of lower 32 bits of object ID. NOTE This assumes that
 * no more than 2^48-1 objects have ever been created on an OST, and that no
 * more than 65535 OSTs are in use. Both are very reasonable assumptions (can
 * uniquely map all objects on an OST that created 1M objects per second for 9
 * years, or combinations thereof).
 *
 * OST_MDT0:
 * Surrogate FID used to identify an existing object on OLD formatted OST
 * filesystem. Belongs to the reserved sequence 0, and is used internally prior
 * to the introduction of FID-on-OST, at which point IDIF will be used to
 * identify objects as residing on a specific OST.
 *
 * LLOG:
 * For Lustre Log objects the object sequence 1 is used. This is compatible with
 * both OLD and NEW.1 namespaces, as this SEQ number is in the ext3/ldiskfs
 * reserved inode range and does not conflict with IGIF sequence numbers.
 *
 * ECHO:
 * For testing OST IO performance the object sequence 2 is used. This is
 * compatible with both OLD and NEW.1 namespaces, as this SEQ number is in the
 * ext3/ldiskfs reserved inode range and does not conflict with IGIF sequence
 * numbers.
 *
 * OST_MDT1 .. OST_MAX:
 * For testing with multiple MDTs the object sequence 3 through 9 is used,
 * allowing direct mapping of MDTs 1 through 7 respectively, for a total of 8
 * MDTs including OST_MDT0. This matches the legacy CMD project "group"
 * mappings. However, this SEQ range is only for testing prior to any production
 * DNE release, as the objects in this range conflict across all OSTs, as the
 * OST index is not part of the FID.
 *
 *
 * For compatibility with existing OLD OST network protocol structures, the FID
 * must map onto the o_id and o_gr in a manner that ensures existing objects are
 * identified consistently for IO, as well as onto the lock namespace to ensure
 * both IDIFs map onto the same objects for IO as well as resources in the DLM.
 *
 * DLM OLD OBIF/IDIF:
 * resource[] = {o_id, o_seq, 0, 0};  // o_seq == 0 for production releases
 *
 * DLM NEW.1 FID (this is the same for both the MDT and OST):
 * resource[] = {SEQ, OID, VER, HASH};
 *
 * Note that for mapping IDIF values to DLM resource names the o_id may be
 * larger than the 2^33 reserved sequence numbers for IDIF, so it is possible
 * for the o_id numbers to overlap FID SEQ numbers in the resource. However, in
 * all production releases the OLD o_seq field is always zero, and all valid FID
 * OID values are non-zero, so the lock resources will not collide.
 *
 * For objects within the IDIF range, group extraction (non-CMD) will be:
 * o_id = (fid->f_seq & 0x7fff) << 16 | fid->f_oid;
 * o_seq = 0;  // formerly group number
 */

/**
 * Note that reserved SEQ numbers below 12 will conflict with ldiskfs
 * inodes in the IGIF namespace, so these reserved SEQ numbers can be
 * used for other purposes and not risk collisions with existing inodes.
 */
enum fid_seq {
        FID_SEQ_OST_MDT0        = 0,
        FID_SEQ_LLOG            = 1, /* unnamed llogs */
        FID_SEQ_ECHO            = 2,
        FID_SEQ_UNUSED_START    = 3,
        FID_SEQ_UNUSED_END      = 9,
        FID_SEQ_LLOG_NAME       = 10, /* named llogs */
        FID_SEQ_RSVD            = 11,
        FID_SEQ_IGIF            = 12,
        FID_SEQ_IGIF_MAX        = 0x0ffffffffULL,
        FID_SEQ_IDIF            = 0x100000000ULL,
        FID_SEQ_IDIF_MAX        = 0x1ffffffffULL,
        /* Normal FID sequence starts from this value, i.e. 1<<33 */
        FID_SEQ_START           = 0x200000000ULL,
        /* sequence for local pre-defined FIDs listed in local_oid */
        FID_SEQ_LOCAL_FILE      = 0x200000001ULL,
        FID_SEQ_DOT_LUSTRE      = 0x200000002ULL,
        /* sequence is used for local named objects FIDs generated
         * by local_object_storage library */
        FID_SEQ_LOCAL_NAME      = 0x200000003ULL,
        /* Because current FLD will only cache the fid sequence, instead
         * of oid on the client side, if the FID needs to be exposed to
         * clients sides, it needs to make sure all of fids under one
         * sequence will be located in one MDT. */
        FID_SEQ_SPECIAL         = 0x200000004ULL,
        FID_SEQ_QUOTA           = 0x200000005ULL,
        FID_SEQ_QUOTA_GLB       = 0x200000006ULL,
        FID_SEQ_ROOT            = 0x200000007ULL,  /* Located on MDT0 */
        FID_SEQ_LAYOUT_RBTREE   = 0x200000008ULL,
        /* sequence is used for update logs of cross-MDT operation */
        FID_SEQ_UPDATE_LOG      = 0x200000009ULL,
        /* Sequence is used for the directory under which update logs
         * are created. */
        FID_SEQ_UPDATE_LOG_DIR  = 0x20000000aULL,
        FID_SEQ_NORMAL          = 0x200000400ULL,
        FID_SEQ_LOV_DEFAULT     = 0xffffffffffffffffULL
};

#define OBIF_OID_MAX_BITS           32
#define OBIF_MAX_OID                (1ULL << OBIF_OID_MAX_BITS)
#define OBIF_OID_MASK               ((1ULL << OBIF_OID_MAX_BITS) - 1)
#define IDIF_OID_MAX_BITS           48
#define IDIF_MAX_OID                (1ULL << IDIF_OID_MAX_BITS)
#define IDIF_OID_MASK               ((1ULL << IDIF_OID_MAX_BITS) - 1)

/** OID for FID_SEQ_SPECIAL */
enum special_oid {
        /* Big Filesystem Lock to serialize rename operations */
        FID_OID_SPECIAL_BFL     = 1UL,
};

/** OID for FID_SEQ_DOT_LUSTRE */
enum dot_lustre_oid {
        FID_OID_DOT_LUSTRE      = 1UL,
        FID_OID_DOT_LUSTRE_OBF  = 2UL,
        FID_OID_DOT_LUSTRE_LPF  = 3UL,
};

/** OID for FID_SEQ_ROOT */
enum root_oid {
        FID_OID_ROOT            = 1UL,
        FID_OID_ECHO_ROOT       = 2UL,
};

struct lu_orphan_rec {
        /* The MDT-object's FID referenced by the orphan OST-object */
        struct lu_fid   lor_fid;
        __u32           lor_uid;
        __u32           lor_gid;
};

struct lu_orphan_ent {
        /* The orphan OST-object's FID */
        struct lu_fid           loe_key;
        struct lu_orphan_rec    loe_rec;
};

struct lu_orphan_rec_v2 {
        struct lu_orphan_rec    lor_rec;
        struct ost_layout       lor_layout;
        __u32                   lor_padding;
};

struct lu_orphan_ent_v2 {
        /* The orphan OST-object's FID */
        struct lu_fid           loe_key;
        struct lu_orphan_rec_v2 loe_rec;
};

/** @} lu_fid */

/** \defgroup lu_dir lu_dir
 * @{ */

/**
 * Enumeration of possible directory entry attributes.
 *
 * Attributes follow directory entry header in the order they appear in this
 * enumeration.
 */
enum lu_dirent_attrs {
        LUDA_FID                = 0x0001,
        LUDA_TYPE               = 0x0002,
        LUDA_64BITHASH          = 0x0004,

        /* The following attrs are used for MDT internal only,
         * not visible to client */

        /* Something in the record is unknown, to be verified in further. */
        LUDA_UNKNOWN            = 0x0400,
        /* Ignore this record, go to next directly. */
        LUDA_IGNORE             = 0x0800,
        /* The system is upgraded, has beed or to be repaired (dryrun). */
        LUDA_UPGRADE            = 0x1000,
        /* The dirent has been repaired, or to be repaired (dryrun). */
        LUDA_REPAIR             = 0x2000,
        /* Only check but not repair the dirent inconsistency */
        LUDA_VERIFY_DRYRUN      = 0x4000,
        /* Verify the dirent consistency */
        LUDA_VERIFY             = 0x8000,
};

#define LU_DIRENT_ATTRS_MASK    0xff00

/**
 * Layout of readdir pages, as transmitted on wire.
 */
struct lu_dirent {
        /** valid if LUDA_FID is set. */
        struct lu_fid lde_fid;
        /** a unique entry identifier: a hash or an offset. */
        __u64         lde_hash;
        /** total record length, including all attributes. */
        __u16         lde_reclen;
        /** name length */
        __u16         lde_namelen;
        /** optional variable size attributes following this entry.
         *  taken from enum lu_dirent_attrs.
         */
        __u32         lde_attrs;
        /** name is followed by the attributes indicated in ->ldp_attrs, in
         *  their natural order. After the last attribute, padding bytes are
         *  added to make ->lde_reclen a multiple of 8.
         */
        char          lde_name[0];
};

/*
 * Definitions of optional directory entry attributes formats.
 *
 * Individual attributes do not have their length encoded in a generic way. It
 * is assumed that consumer of an attribute knows its format. This means that
 * it is impossible to skip over an unknown attribute, except by skipping over all
 * remaining attributes (by using ->lde_reclen), which is not too
 * constraining, because new server versions will append new attributes at
 * the end of an entry.
 */

/**
 * Fid directory attribute: a fid of an object referenced by the entry. This
 * will be almost always requested by the client and supplied by the server.
 *
 * Aligned to 8 bytes.
 */
/* To have compatibility with 1.8, lets have fid in lu_dirent struct. */

/**
 * File type.
 *
 * Aligned to 2 bytes.
 */
struct luda_type {
        __u16 lt_type;
};

struct lu_dirpage {
        __u64            ldp_hash_start;
        __u64            ldp_hash_end;
        __u32            ldp_flags;
        __u32            ldp_pad0;
        struct lu_dirent ldp_entries[0];
};

enum lu_dirpage_flags {
        /**
         * dirpage contains no entry.
         */
        LDF_EMPTY   = 1 << 0,
        /**
         * last entry's lde_hash equals ldp_hash_end.
         */
        LDF_COLLIDE = 1 << 1
};

static inline struct lu_dirent *lu_dirent_start(struct lu_dirpage *dp)
{
        if (__le32_to_cpu(dp->ldp_flags) & LDF_EMPTY)
                return NULL;
        else
                return dp->ldp_entries;
}

static inline struct lu_dirent *lu_dirent_next(struct lu_dirent *ent)
{
        struct lu_dirent *next;

        if (__le16_to_cpu(ent->lde_reclen) != 0)
                next = ((void *)ent) + __le16_to_cpu(ent->lde_reclen);
        else
                next = NULL;

        return next;
}

static inline size_t lu_dirent_calc_size(size_t namelen, __u16 attr)
{
        size_t size;

        if (attr & LUDA_TYPE) {
                const size_t align = sizeof(struct luda_type) - 1;
                size = (sizeof(struct lu_dirent) + namelen + align) & ~align;
                size += sizeof(struct luda_type);
        } else
                size = sizeof(struct lu_dirent) + namelen;

        return (size + 7) & ~7;
}

#define MDS_DIR_END_OFF 0xfffffffffffffffeULL

/**
 * MDS_READPAGE page size
 *
 * This is the directory page size packed in MDS_READPAGE RPC.
 * It's different than PAGE_SIZE because the client needs to
 * access the struct lu_dirpage header packed at the beginning of
 * the "page" and without this there isn't any way to know find the
 * lu_dirpage header is if client and server PAGE_SIZE differ.
 */
#define LU_PAGE_SHIFT 12
#define LU_PAGE_SIZE  (1UL << LU_PAGE_SHIFT)
#define LU_PAGE_MASK  (~(LU_PAGE_SIZE - 1))

#define LU_PAGE_COUNT (1 << (PAGE_SHIFT - LU_PAGE_SHIFT))

/** @} lu_dir */

struct lustre_handle {
        __u64 cookie;
};
#define DEAD_HANDLE_MAGIC 0xdeadbeefcafebabeULL

static inline bool lustre_handle_is_used(const struct lustre_handle *lh)
{
        return lh->cookie != 0;
}

static inline bool lustre_handle_equal(const struct lustre_handle *lh1,
                                       const struct lustre_handle *lh2)
{
        return lh1->cookie == lh2->cookie;
}

static inline void lustre_handle_copy(struct lustre_handle *tgt,
                                      const struct lustre_handle *src)
{
        tgt->cookie = src->cookie;
}

struct lustre_handle_array {
        unsigned int            count;
        struct lustre_handle    handles[0];
};

/* flags for lm_flags */
#define MSGHDR_AT_SUPPORT               0x1
#define MSGHDR_CKSUM_INCOMPAT18         0x2

#define lustre_msg lustre_msg_v2
/* we depend on this structure to be 8-byte aligned */
/* this type is only endian-adjusted in lustre_unpack_msg() */
struct lustre_msg_v2 {
        __u32 lm_bufcount;
        __u32 lm_secflvr;
        __u32 lm_magic;
        __u32 lm_repsize;
        __u32 lm_cksum;
        __u32 lm_flags;
        __u32 lm_padding_2;
        __u32 lm_padding_3;
        __u32 lm_buflens[0];
};

/* without gss, ptlrpc_body is put at the first buffer. */
#define PTLRPC_NUM_VERSIONS     4
struct ptlrpc_body_v3 {
        struct lustre_handle pb_handle;
        __u32 pb_type;
        __u32 pb_version;
        __u32 pb_opc;
        __u32 pb_status;
        __u64 pb_last_xid; /* highest replied XID without lower unreplied XID */
        __u16 pb_tag;      /* virtual slot idx for multiple modifying RPCs */
        __u16 pb_padding0;
        __u32 pb_padding1;
        __u64 pb_last_committed;
        __u64 pb_transno;
        __u32 pb_flags;
        __u32 pb_op_flags;
        __u32 pb_conn_cnt;
        __u32 pb_timeout;  /* for req, the deadline, for rep, the service est */
        __u32 pb_service_time; /* for rep, actual service time */
        __u32 pb_limit;
        __u64 pb_slv;
        /* VBR: pre-versions */
        __u64 pb_pre_versions[PTLRPC_NUM_VERSIONS];
        __u64 pb_mbits; /**< match bits for bulk request */
        /* padding for future needs */
        __u64 pb_padding64_0;
        __u64 pb_padding64_1;
        __u64 pb_padding64_2;
        char  pb_jobid[LUSTRE_JOBID_SIZE];
};
#define ptlrpc_body     ptlrpc_body_v3

struct ptlrpc_body_v2 {
        struct lustre_handle pb_handle;
        __u32 pb_type;
        __u32 pb_version;
        __u32 pb_opc;
        __u32 pb_status;
        __u64 pb_last_xid; /* highest replied XID without lower unreplied XID */
        __u16 pb_tag;      /* virtual slot idx for multiple modifying RPCs */
        __u16 pb_padding0;
        __u32 pb_padding1;
        __u64 pb_last_committed;
        __u64 pb_transno;
        __u32 pb_flags;
        __u32 pb_op_flags;
        __u32 pb_conn_cnt;
        __u32 pb_timeout;  /* for req, the deadline, for rep, the service est */
        __u32 pb_service_time; /* for rep, actual service time, also used for
                                  net_latency of req */
        __u32 pb_limit;
        __u64 pb_slv;
        /* VBR: pre-versions */
        __u64 pb_pre_versions[PTLRPC_NUM_VERSIONS];
        __u64 pb_mbits; /**< unused in V2 */
        /* padding for future needs */
        __u64 pb_padding64_0;
        __u64 pb_padding64_1;
        __u64 pb_padding64_2;
};

/* message body offset for lustre_msg_v2 */
/* ptlrpc body offset in all request/reply messages */
#define MSG_PTLRPC_BODY_OFF             0

/* normal request/reply message record offset */
#define REQ_REC_OFF                     1
#define REPLY_REC_OFF                   1

/* ldlm request message body offset */
#define DLM_LOCKREQ_OFF                 1 /* lockreq offset */
#define DLM_REQ_REC_OFF                 2 /* normal dlm request record offset */

/* ldlm intent lock message body offset */
#define DLM_INTENT_IT_OFF               2 /* intent lock it offset */
#define DLM_INTENT_REC_OFF              3 /* intent lock record offset */

/* ldlm reply message body offset */
#define DLM_LOCKREPLY_OFF               1 /* lockrep offset */
#define DLM_REPLY_REC_OFF               2 /* reply record offset */

/** only use in req->rq_{req,rep}_swab_mask */
#define MSG_PTLRPC_HEADER_OFF           31

/* Flags that are operation-specific go in the top 16 bits. */
#define MSG_OP_FLAG_MASK   0xffff0000
#define MSG_OP_FLAG_SHIFT  16

/* Flags that apply to all requests are in the bottom 16 bits */
#define MSG_GEN_FLAG_MASK     0x0000ffff
#define MSG_LAST_REPLAY           0x0001
#define MSG_RESENT                0x0002
#define MSG_REPLAY                0x0004
/* #define MSG_AT_SUPPORT         0x0008
 * This was used in early prototypes of adaptive timeouts, and while there
 * shouldn't be any users of that code there also isn't a need for using this
 * bits. Defer usage until at least 1.10 to avoid potential conflict. */
#define MSG_DELAY_REPLAY          0x0010
#define MSG_VERSION_REPLAY        0x0020
#define MSG_REQ_REPLAY_DONE       0x0040
#define MSG_LOCK_REPLAY_DONE      0x0080

/*
 * Flags for all connect opcodes (MDS_CONNECT, OST_CONNECT)
 */

#define MSG_CONNECT_RECOVERING  0x00000001
#define MSG_CONNECT_RECONNECT   0x00000002
#define MSG_CONNECT_REPLAYABLE  0x00000004
//#define MSG_CONNECT_PEER        0x8
#define MSG_CONNECT_LIBCLIENT   0x00000010
#define MSG_CONNECT_INITIAL     0x00000020
#define MSG_CONNECT_ASYNC       0x00000040
#define MSG_CONNECT_NEXT_VER    0x00000080 /* use next version of lustre_msg */
#define MSG_CONNECT_TRANSNO     0x00000100 /* report transno */

/* Connect flags */
#define OBD_CONNECT_RDONLY                0x1ULL /*client has read-only access*/
#define OBD_CONNECT_INDEX                 0x2ULL /*connect specific LOV idx */
#define OBD_CONNECT_MDS                   0x4ULL /*connect from MDT to OST */
#define OBD_CONNECT_GRANT                 0x8ULL /*OSC gets grant at connect */
#define OBD_CONNECT_SRVLOCK              0x10ULL /*server takes locks for cli */
#define OBD_CONNECT_VERSION              0x20ULL /*Lustre versions in ocd */
#define OBD_CONNECT_REQPORTAL            0x40ULL /*Separate non-IO req portal */
#define OBD_CONNECT_ACL                  0x80ULL /*access control lists */
#define OBD_CONNECT_XATTR               0x100ULL /*client use extended attr */
#define OBD_CONNECT_CROW                0x200ULL /*MDS+OST create obj on write*/
#define OBD_CONNECT_TRUNCLOCK           0x400ULL /*locks on server for punch */
#define OBD_CONNECT_TRANSNO             0x800ULL /*replay sends init transno */
#define OBD_CONNECT_IBITS              0x1000ULL /*support for inodebits locks*/
#define OBD_CONNECT_BARRIER            0x2000ULL /* write barrier */
#define OBD_CONNECT_ATTRFID            0x4000ULL /*Server can GetAttr By Fid*/
#define OBD_CONNECT_NODEVOH            0x8000ULL /*No open hndl on specl nodes*/
#define OBD_CONNECT_RMT_CLIENT        0x10000ULL /* Remote client, never used
                                                  * in production. Removed in
                                                  * 2.9. Keep this flag to
                                                  * avoid reusing.
                                                  */
#define OBD_CONNECT_RMT_CLIENT_FORCE  0x20000ULL /* Remote client by force,
                                                  * never used in production.
                                                  * Removed in 2.9. Keep this
                                                  * flag to avoid reusing.
                                                  */
#define OBD_CONNECT_BRW_SIZE          0x40000ULL /*Max bytes per rpc */
#define OBD_CONNECT_QUOTA64           0x80000ULL /*Not used since 2.4 */
#define OBD_CONNECT_MDS_CAPA         0x100000ULL /*MDS capability */
#define OBD_CONNECT_OSS_CAPA         0x200000ULL /*OSS capability */
#define OBD_CONNECT_CANCELSET        0x400000ULL /*Early batched cancels. */
#define OBD_CONNECT_SOM              0x800000ULL /*Size on MDS */
#define OBD_CONNECT_AT              0x1000000ULL /*client uses AT */
#define OBD_CONNECT_LRU_RESIZE      0x2000000ULL /*LRU resize feature. */
#define OBD_CONNECT_MDS_MDS         0x4000000ULL /*MDS-MDS connection */
#define OBD_CONNECT_REAL            0x8000000ULL /* obsolete since 2.8 */
#define OBD_CONNECT_CHANGE_QS      0x10000000ULL /*Not used since 2.4 */
#define OBD_CONNECT_CKSUM          0x20000000ULL /*support several cksum algos*/
#define OBD_CONNECT_FID            0x40000000ULL /*FID is supported by server */
#define OBD_CONNECT_VBR            0x80000000ULL /*version based recovery */
#define OBD_CONNECT_LOV_V3        0x100000000ULL /*client supports LOV v3 EA */
#define OBD_CONNECT_GRANT_SHRINK  0x200000000ULL /* support grant shrink */
#define OBD_CONNECT_SKIP_ORPHAN   0x400000000ULL /* don't reuse orphan objids */
#define OBD_CONNECT_MAX_EASIZE    0x800000000ULL /* preserved for large EA */
#define OBD_CONNECT_FULL20       0x1000000000ULL /* it is 2.0 client */
#define OBD_CONNECT_LAYOUTLOCK   0x2000000000ULL /* client uses layout lock */
#define OBD_CONNECT_64BITHASH    0x4000000000ULL /* client supports 64-bits
                                                  * directory hash */
#define OBD_CONNECT_MAXBYTES     0x8000000000ULL /* max stripe size */
#define OBD_CONNECT_IMP_RECOV   0x10000000000ULL /* imp recovery support */
#define OBD_CONNECT_JOBSTATS    0x20000000000ULL /* jobid in ptlrpc_body */
#define OBD_CONNECT_UMASK       0x40000000000ULL /* create uses client umask */
#define OBD_CONNECT_EINPROGRESS 0x80000000000ULL /* client handles -EINPROGRESS
                                                  * RPC error properly */
#define OBD_CONNECT_GRANT_PARAM 0x100000000000ULL/* extra grant params used for
                                                  * finer space reservation */
#define OBD_CONNECT_FLOCK_OWNER 0x200000000000ULL /* for the fixed 1.8
                                                   * policy and 2.x server */
#define OBD_CONNECT_LVB_TYPE    0x400000000000ULL /* variable type of LVB */
#define OBD_CONNECT_NANOSEC_TIME 0x800000000000ULL /* nanosecond timestamps */
#define OBD_CONNECT_LIGHTWEIGHT 0x1000000000000ULL/* lightweight connection */
#define OBD_CONNECT_SHORTIO     0x2000000000000ULL/* short io */
#define OBD_CONNECT_PINGLESS    0x4000000000000ULL/* pings not required */
#define OBD_CONNECT_FLOCK_DEAD  0x8000000000000ULL/* improved flock deadlock detection */
#define OBD_CONNECT_DISP_STRIPE 0x10000000000000ULL/* create stripe disposition*/
#define OBD_CONNECT_OPEN_BY_FID 0x20000000000000ULL /* open by fid won't pack
                                                       name in request */
#define OBD_CONNECT_LFSCK      0x40000000000000ULL/* support online LFSCK */
#define OBD_CONNECT_UNLINK_CLOSE 0x100000000000000ULL/* close file in unlink */
#define OBD_CONNECT_MULTIMODRPCS 0x200000000000000ULL /* support multiple modify
                                                         RPCs in parallel */
#define OBD_CONNECT_DIR_STRIPE   0x400000000000000ULL /* striped DNE dir */
#define OBD_CONNECT_SUBTREE     0x800000000000000ULL /* fileset mount */
#define OBD_CONNECT_LOCK_AHEAD   0x1000000000000000ULL /* lock ahead */
/** bulk matchbits is sent within ptlrpc_body */
#define OBD_CONNECT_BULK_MBITS   0x2000000000000000ULL
#define OBD_CONNECT_OBDOPACK     0x4000000000000000ULL /* compact OUT obdo */
#define OBD_CONNECT_FLAGS2       0x8000000000000000ULL /* second flags word */
/* ocd_connect_flags2 flags */
#define OBD_CONNECT2_FILE_SECCTX        0x1ULL /* set file security context at create */

/* XXX README XXX:
 * Please DO NOT add flag values here before first ensuring that this same
 * flag value is not in use on some other branch.  Please clear any such
 * changes with senior engineers before starting to use a new flag.  Then,
 * submit a small patch against EVERY branch that ONLY adds the new flag,
 * updates obd_connect_names[] for lprocfs_rd_connect_flags(), adds the
 * flag to check_obd_connect_data(), and updates wiretests accordingly, so it
 * can be approved and landed easily to reserve the flag for future use. */

/* The MNE_SWAB flag is overloading the MDS_MDS bit only for the MGS
 * connection.  It is a temporary bug fix for Imperative Recovery interop
 * between 2.2 and 2.3 x86/ppc nodes, and can be removed when interop for
 * 2.2 clients/servers is no longer needed.  LU-1252/LU-1644. */
#define OBD_CONNECT_MNE_SWAB             OBD_CONNECT_MDS_MDS

#define OCD_HAS_FLAG(ocd, flg)  \
        (!!((ocd)->ocd_connect_flags & OBD_CONNECT_##flg))


#ifdef HAVE_LRU_RESIZE_SUPPORT
#define LRU_RESIZE_CONNECT_FLAG OBD_CONNECT_LRU_RESIZE
#else
#define LRU_RESIZE_CONNECT_FLAG 0
#endif

#define MDT_CONNECT_SUPPORTED  (OBD_CONNECT_RDONLY | OBD_CONNECT_VERSION | \
                                OBD_CONNECT_ACL | OBD_CONNECT_XATTR | \
                                OBD_CONNECT_IBITS | OBD_CONNECT_NODEVOH | \
                                OBD_CONNECT_ATTRFID | OBD_CONNECT_CANCELSET | \
                                OBD_CONNECT_AT | OBD_CONNECT_BRW_SIZE | \
                                OBD_CONNECT_MDS_MDS | OBD_CONNECT_FID | \
                                LRU_RESIZE_CONNECT_FLAG | OBD_CONNECT_VBR | \
                                OBD_CONNECT_LOV_V3 | OBD_CONNECT_FULL20 | \
                                OBD_CONNECT_64BITHASH | OBD_CONNECT_JOBSTATS | \
                                OBD_CONNECT_EINPROGRESS | \
                                OBD_CONNECT_LIGHTWEIGHT | OBD_CONNECT_UMASK | \
                                OBD_CONNECT_LVB_TYPE | OBD_CONNECT_LAYOUTLOCK |\
                                OBD_CONNECT_PINGLESS | OBD_CONNECT_MAX_EASIZE |\
                                OBD_CONNECT_FLOCK_DEAD | \
                                OBD_CONNECT_DISP_STRIPE | OBD_CONNECT_LFSCK | \
                                OBD_CONNECT_OPEN_BY_FID | \
                                OBD_CONNECT_DIR_STRIPE | \
                                OBD_CONNECT_BULK_MBITS | \
                                OBD_CONNECT_MULTIMODRPCS | \
                                OBD_CONNECT_SUBTREE | \
                                OBD_CONNECT_FLAGS2)

#define MDT_CONNECT_SUPPORTED2 OBD_CONNECT2_FILE_SECCTX

#define OST_CONNECT_SUPPORTED  (OBD_CONNECT_SRVLOCK | OBD_CONNECT_GRANT | \
                                OBD_CONNECT_REQPORTAL | OBD_CONNECT_VERSION | \
                                OBD_CONNECT_TRUNCLOCK | OBD_CONNECT_INDEX | \
                                OBD_CONNECT_BRW_SIZE | OBD_CONNECT_CANCELSET | \
                                OBD_CONNECT_AT | LRU_RESIZE_CONNECT_FLAG | \
                                OBD_CONNECT_CKSUM | OBD_CONNECT_VBR | \
                                OBD_CONNECT_MDS | OBD_CONNECT_SKIP_ORPHAN | \
                                OBD_CONNECT_GRANT_SHRINK | OBD_CONNECT_FULL20 |\
                                OBD_CONNECT_64BITHASH | OBD_CONNECT_MAXBYTES | \
                                OBD_CONNECT_MAX_EASIZE | \
                                OBD_CONNECT_EINPROGRESS | \
                                OBD_CONNECT_JOBSTATS | \
                                OBD_CONNECT_LIGHTWEIGHT | OBD_CONNECT_LVB_TYPE|\
                                OBD_CONNECT_LAYOUTLOCK | OBD_CONNECT_FID | \
                                OBD_CONNECT_PINGLESS | OBD_CONNECT_LFSCK | \
                                OBD_CONNECT_BULK_MBITS | \
                                OBD_CONNECT_GRANT_PARAM)
#define OST_CONNECT_SUPPORTED2 0

#define ECHO_CONNECT_SUPPORTED 0
#define ECHO_CONNECT_SUPPORTED2 0

#define MGS_CONNECT_SUPPORTED  (OBD_CONNECT_VERSION | OBD_CONNECT_AT | \
                                OBD_CONNECT_FULL20 | OBD_CONNECT_IMP_RECOV | \
                                OBD_CONNECT_MNE_SWAB | OBD_CONNECT_PINGLESS |\
                                OBD_CONNECT_BULK_MBITS | OBD_CONNECT_BARRIER)

#define MGS_CONNECT_SUPPORTED2 0

/* Features required for this version of the client to work with server */
#define CLIENT_CONNECT_MDT_REQD (OBD_CONNECT_IBITS | OBD_CONNECT_FID | \
                                 OBD_CONNECT_FULL20)

/* This structure is used for both request and reply.
 *
 * If we eventually have separate connect data for different types, which we
 * almost certainly will, then perhaps we stick a union in here. */
struct obd_connect_data {
        __u64 ocd_connect_flags; /* OBD_CONNECT_* per above */
        __u32 ocd_version;       /* lustre release version number */
        __u32 ocd_grant;         /* initial cache grant amount (bytes) */
        __u32 ocd_index;         /* LOV index to connect to */
        __u32 ocd_brw_size;      /* Maximum BRW size in bytes */
        __u64 ocd_ibits_known;   /* inode bits this client understands */
        __u8  ocd_grant_blkbits; /* log2 of the backend filesystem blocksize */
        __u8  ocd_grant_inobits; /* log2 of the per-inode space consumption */
        __u16 ocd_grant_tax_kb;  /* extent insertion overhead, in 1K blocks */
        __u32 ocd_grant_max_blks;/* maximum number of blocks per extent */
        __u64 ocd_transno;       /* first transno from client to be replayed */
        __u32 ocd_group;         /* MDS group on OST */
        __u32 ocd_cksum_types;   /* supported checksum algorithms */
        __u32 ocd_max_easize;    /* How big LOV EA can be on MDS */
        __u32 ocd_instance;      /* instance # of this target */
        __u64 ocd_maxbytes;      /* Maximum stripe size in bytes */
        /* Fields after ocd_maxbytes are only accessible by the receiver
         * if the corresponding flag in ocd_connect_flags is set. Accessing
         * any field after ocd_maxbytes on the receiver without a valid flag
         * may result in out-of-bound memory access and kernel oops. */
        __u16 ocd_maxmodrpcs;    /* Maximum modify RPCs in parallel */
        __u16 padding0;          /* added 2.1.0. also fix lustre_swab_connect */
        __u32 padding1;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 ocd_connect_flags2;
        __u64 padding3;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 padding4;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 padding5;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 padding6;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 padding7;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 padding8;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 padding9;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 paddingA;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 paddingB;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 paddingC;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 paddingD;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 paddingE;          /* added 2.1.0. also fix lustre_swab_connect */
        __u64 paddingF;          /* added 2.1.0. also fix lustre_swab_connect */
};
/* XXX README XXX:
 * Please DO NOT use any fields here before first ensuring that this same
 * field is not in use on some other branch.  Please clear any such changes
 * with senior engineers before starting to use a new field.  Then, submit
 * a small patch against EVERY branch that ONLY adds the new field along with
 * the matching OBD_CONNECT flag, so that can be approved and landed easily to
 * reserve the flag for future use. */

/*
 * Supported checksum algorithms. Up to 32 checksum types are supported.
 * (32-bit mask stored in obd_connect_data::ocd_cksum_types)
 * Please update DECLARE_CKSUM_NAME/OBD_CKSUM_ALL in obd.h when adding a new
 * algorithm and also the OBD_FL_CKSUM* flags.
 */
typedef enum cksum_types {
        OBD_CKSUM_CRC32 = 0x00000001,
        OBD_CKSUM_ADLER = 0x00000002,
        OBD_CKSUM_CRC32C= 0x00000004,
} cksum_type_t;

/*
 *   OST requests: OBDO & OBD request records
 */

/* opcodes */
typedef enum {
        OST_REPLY      =  0,       /* reply ? */
        OST_GETATTR    =  1,
        OST_SETATTR    =  2,
        OST_READ       =  3,
        OST_WRITE      =  4,
        OST_CREATE     =  5,
        OST_DESTROY    =  6,
        OST_GET_INFO   =  7,
        OST_CONNECT    =  8,
        OST_DISCONNECT =  9,
        OST_PUNCH      = 10,
        OST_OPEN       = 11,
        OST_CLOSE      = 12,
        OST_STATFS     = 13,
        OST_SYNC       = 16,
        OST_SET_INFO   = 17,
        OST_QUOTACHECK = 18, /* not used since 2.4 */
        OST_QUOTACTL   = 19,
        OST_QUOTA_ADJUST_QUNIT = 20, /* not used since 2.4 */
        OST_LADVISE    = 21,
        OST_LAST_OPC /* must be < 33 to avoid MDS_GETATTR */
} ost_cmd_t;
#define OST_FIRST_OPC  OST_REPLY

enum obdo_flags {
        OBD_FL_INLINEDATA   = 0x00000001,
        OBD_FL_OBDMDEXISTS  = 0x00000002,
        OBD_FL_DELORPHAN    = 0x00000004, /* if set in o_flags delete orphans */
        OBD_FL_NORPC        = 0x00000008, /* set in o_flags do in OSC not OST */
        OBD_FL_IDONLY       = 0x00000010, /* set in o_flags only adjust obj id*/
        OBD_FL_RECREATE_OBJS= 0x00000020, /* recreate missing obj */
        OBD_FL_DEBUG_CHECK  = 0x00000040, /* echo client/server debug check */
        OBD_FL_NO_PRJQUOTA  = 0x00000080, /* the object's project is over
                                           * quota */
        OBD_FL_NO_USRQUOTA  = 0x00000100, /* the object's owner is over quota */
        OBD_FL_NO_GRPQUOTA  = 0x00000200, /* the object's group is over quota */
        OBD_FL_CREATE_CROW  = 0x00000400, /* object should be create on write */
        OBD_FL_SRVLOCK      = 0x00000800, /* delegate DLM locking to server */
        OBD_FL_CKSUM_CRC32  = 0x00001000, /* CRC32 checksum type */
        OBD_FL_CKSUM_ADLER  = 0x00002000, /* ADLER checksum type */
        OBD_FL_CKSUM_CRC32C = 0x00004000, /* CRC32C checksum type */
        OBD_FL_CKSUM_RSVD2  = 0x00008000, /* for future cksum types */
        OBD_FL_CKSUM_RSVD3  = 0x00010000, /* for future cksum types */
        OBD_FL_SHRINK_GRANT = 0x00020000, /* object shrink the grant */
        OBD_FL_MMAP         = 0x00040000, /* object is mmapped on the client.
                                           * XXX: obsoleted - reserved for old
                                           * clients prior than 2.2 */
        OBD_FL_RECOV_RESEND = 0x00080000, /* recoverable resent */
        OBD_FL_NOSPC_BLK    = 0x00100000, /* no more block space on OST */
        OBD_FL_FLUSH        = 0x00200000, /* flush pages on the OST */
        OBD_FL_SHORT_IO     = 0x00400000, /* short io request */

        /* Note that while these checksum values are currently separate bits,
         * in 2.x we can actually allow all values from 1-31 if we wanted. */
        OBD_FL_CKSUM_ALL    = OBD_FL_CKSUM_CRC32 | OBD_FL_CKSUM_ADLER |
                              OBD_FL_CKSUM_CRC32C,

        /* mask for local-only flag, which won't be sent over network */
        OBD_FL_LOCAL_MASK   = 0xF0000000,
};

/*
 * All LOV EA magics should have the same postfix, if some new version
 * Lustre instroduces new LOV EA magic, then when down-grade to an old
 * Lustre, even though the old version system does not recognizes such
 * new magic, it still can distinguish the corrupted cases by checking
 * the magic's postfix.
 */
#define LOV_MAGIC_MAGIC 0x0BD0
#define LOV_MAGIC_MASK  0xFFFF

#define LOV_MAGIC_V1            (0x0BD10000 | LOV_MAGIC_MAGIC)
#define LOV_MAGIC_JOIN_V1       (0x0BD20000 | LOV_MAGIC_MAGIC)
#define LOV_MAGIC_V3            (0x0BD30000 | LOV_MAGIC_MAGIC)
#define LOV_MAGIC_MIGRATE       (0x0BD40000 | LOV_MAGIC_MAGIC)
/* reserved for specifying OSTs */
#define LOV_MAGIC_SPECIFIC      (0x0BD50000 | LOV_MAGIC_MAGIC)
#define LOV_MAGIC               LOV_MAGIC_V1
#define LOV_MAGIC_COMP_V1       (0x0BD60000 | LOV_MAGIC_MAGIC)

/*
 * magic for fully defined striping
 * the idea is that we should have different magics for striping "hints"
 * (struct lov_user_md_v[13]) and defined ready-to-use striping (struct
 * lov_mds_md_v[13]). at the moment the magics are used in wire protocol,
 * we can't just change it w/o long way preparation, but we still need a
 * mechanism to allow LOD to differentiate hint versus ready striping.
 * so, at the moment we do a trick: MDT knows what to expect from request
 * depending on the case (replay uses ready striping, non-replay req uses
 * hints), so MDT replaces magic with appropriate one and now LOD can
 * easily understand what's inside -bzzz
 *
 * those *_DEF magics are only used on server side internally, they
 * won't be put on wire or disk.
 */
#define LOV_MAGIC_DEF           0x10000000
#define LOV_MAGIC_V1_DEF        (LOV_MAGIC_DEF | LOV_MAGIC_V1)
#define LOV_MAGIC_V3_DEF        (LOV_MAGIC_DEF | LOV_MAGIC_V3)
#define LOV_MAGIC_COMP_V1_DEF   (LOV_MAGIC_DEF | LOV_MAGIC_COMP_V1)

#define lov_pattern(pattern)            (pattern & ~LOV_PATTERN_F_MASK)
#define lov_pattern_flags(pattern)      (pattern & LOV_PATTERN_F_MASK)

#define lov_ost_data lov_ost_data_v1
struct lov_ost_data_v1 {          /* per-stripe data structure (little-endian)*/
        struct ost_id l_ost_oi;   /* OST object ID */
        __u32 l_ost_gen;          /* generation of this l_ost_idx */
        __u32 l_ost_idx;          /* OST index in LOV (lov_tgt_desc->tgts) */
};

#define lov_mds_md lov_mds_md_v1
struct lov_mds_md_v1 {            /* LOV EA mds/wire data (little-endian) */
        __u32 lmm_magic;          /* magic number = LOV_MAGIC_V1 */
        __u32 lmm_pattern;        /* LOV_PATTERN_RAID0, LOV_PATTERN_RAID1 */
        struct ost_id   lmm_oi;   /* LOV object ID */
        __u32 lmm_stripe_size;    /* size of stripe in bytes */
        /* lmm_stripe_count used to be __u32 */
        __u16 lmm_stripe_count;   /* num stripes in use for this object */
        __u16 lmm_layout_gen;     /* layout generation number */
        struct lov_ost_data_v1 lmm_objects[0]; /* per-stripe data */
};

#define MAX_MD_SIZE (sizeof(struct lov_mds_md) + 4 * sizeof(struct lov_ost_data))
#define MIN_MD_SIZE (sizeof(struct lov_mds_md) + 1 * sizeof(struct lov_ost_data))

/* This is the default MDT reply size allocated, should the striping be bigger,
 * it will be reallocated in mdt_fix_reply.
 * 100 stripes is a bit less than 2.5k of data */
#define DEF_REP_MD_SIZE (sizeof(struct lov_mds_md) + \
                         100 * sizeof(struct lov_ost_data))

#define XATTR_NAME_ACL_ACCESS   "system.posix_acl_access"
#define XATTR_NAME_ACL_DEFAULT  "system.posix_acl_default"
#define XATTR_USER_PREFIX       "user."
#define XATTR_TRUSTED_PREFIX    "trusted."
#define XATTR_SECURITY_PREFIX   "security."

#define XATTR_NAME_LOV          "trusted.lov"
#define XATTR_NAME_LMA          "trusted.lma"
#define XATTR_NAME_LMV          "trusted.lmv"
#define XATTR_NAME_DEFAULT_LMV  "trusted.dmv"
#define XATTR_NAME_LINK         "trusted.link"
#define XATTR_NAME_FID          "trusted.fid"
#define XATTR_NAME_VERSION      "trusted.version"
#define XATTR_NAME_SOM          "trusted.som"
#define XATTR_NAME_HSM          "trusted.hsm"
#define XATTR_NAME_LFSCK_BITMAP "trusted.lfsck_bitmap"
#define XATTR_NAME_DUMMY        "trusted.dummy"

#define XATTR_NAME_LFSCK_NAMESPACE "trusted.lfsck_ns"
#define XATTR_NAME_MAX_LEN      32 /* increase this, if there is longer name. */

struct lov_mds_md_v3 {            /* LOV EA mds/wire data (little-endian) */
        __u32 lmm_magic;          /* magic number = LOV_MAGIC_V3 */
        __u32 lmm_pattern;        /* LOV_PATTERN_RAID0, LOV_PATTERN_RAID1 */
        struct ost_id   lmm_oi;   /* LOV object ID */
        __u32 lmm_stripe_size;    /* size of stripe in bytes */
        /* lmm_stripe_count used to be __u32 */
        __u16 lmm_stripe_count;   /* num stripes in use for this object */
        __u16 lmm_layout_gen;     /* layout generation number */
        char  lmm_pool_name[LOV_MAXPOOLNAME + 1]; /* must be 32bit aligned */
        struct lov_ost_data_v1 lmm_objects[0]; /* per-stripe data */
};

static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
{
        if (lmm_magic == LOV_MAGIC_V3)
                return sizeof(struct lov_mds_md_v3) +
                                stripes * sizeof(struct lov_ost_data_v1);
        else
                return sizeof(struct lov_mds_md_v1) +
                                stripes * sizeof(struct lov_ost_data_v1);
}

static inline __u32
lov_mds_md_max_stripe_count(size_t buf_size, __u32 lmm_magic)
{
        switch (lmm_magic) {
        case LOV_MAGIC_V1: {
                struct lov_mds_md_v1 lmm;

                if (buf_size < sizeof(lmm))
                        return 0;

                return (buf_size - sizeof(lmm)) / sizeof(lmm.lmm_objects[0]);
        }
        case LOV_MAGIC_V3: {
                struct lov_mds_md_v3 lmm;

                if (buf_size < sizeof(lmm))
                        return 0;

                return (buf_size - sizeof(lmm)) / sizeof(lmm.lmm_objects[0]);
        }
        default:
                return 0;
        }
}

#define OBD_MD_FLID        (0x00000001ULL) /* object ID */
#define OBD_MD_FLATIME     (0x00000002ULL) /* access time */
#define OBD_MD_FLMTIME     (0x00000004ULL) /* data modification time */
#define OBD_MD_FLCTIME     (0x00000008ULL) /* change time */
#define OBD_MD_FLSIZE      (0x00000010ULL) /* size */
#define OBD_MD_FLBLOCKS    (0x00000020ULL) /* allocated blocks count */
#define OBD_MD_FLBLKSZ     (0x00000040ULL) /* block size */
#define OBD_MD_FLMODE      (0x00000080ULL) /* access bits (mode & ~S_IFMT) */
#define OBD_MD_FLTYPE      (0x00000100ULL) /* object type (mode & S_IFMT) */
#define OBD_MD_FLUID       (0x00000200ULL) /* user ID */
#define OBD_MD_FLGID       (0x00000400ULL) /* group ID */
#define OBD_MD_FLFLAGS     (0x00000800ULL) /* flags word */
#define OBD_MD_FLNLINK     (0x00002000ULL) /* link count */
#define OBD_MD_FLGENER     (0x00004000ULL) /* generation number */
/*#define OBD_MD_FLINLINE    (0x00008000ULL)  inline data. used until 1.6.5 */
#define OBD_MD_FLRDEV      (0x00010000ULL) /* device number */
#define OBD_MD_FLEASIZE    (0x00020000ULL) /* extended attribute data */
#define OBD_MD_LINKNAME    (0x00040000ULL) /* symbolic link target */
#define OBD_MD_FLHANDLE    (0x00080000ULL) /* file/lock handle */
#define OBD_MD_FLCKSUM     (0x00100000ULL) /* bulk data checksum */
#define OBD_MD_FLQOS       (0x00200000ULL) /* quality of service stats */
/*      OBD_MD_FLCOOKIE    (0x00800000ULL)    obsolete in 2.8 */
#define OBD_MD_FLPRJQUOTA  (0x00400000ULL) /* over quota flags sent from ost */
#define OBD_MD_FLGROUP     (0x01000000ULL) /* group */
#define OBD_MD_FLFID       (0x02000000ULL) /* ->ost write inline fid */
#define OBD_MD_FLEPOCH     (0x04000000ULL) /* ->ost write with ioepoch */
                                           /* ->mds if epoch opens or closes */
#define OBD_MD_FLGRANT     (0x08000000ULL) /* ost preallocation space grant */
#define OBD_MD_FLDIREA     (0x10000000ULL) /* dir's extended attribute data */
#define OBD_MD_FLUSRQUOTA  (0x20000000ULL) /* over quota flags sent from ost */
#define OBD_MD_FLGRPQUOTA  (0x40000000ULL) /* over quota flags sent from ost */
#define OBD_MD_FLMODEASIZE (0x80000000ULL) /* EA size will be changed */

#define OBD_MD_MDS         (0x0000000100000000ULL) /* where an inode lives on */
#define OBD_MD_REINT       (0x0000000200000000ULL) /* reintegrate oa */
#define OBD_MD_MEA         (0x0000000400000000ULL) /* CMD split EA  */
#define OBD_MD_TSTATE      (0x0000000800000000ULL) /* transient state field */

#define OBD_MD_FLXATTR       (0x0000001000000000ULL) /* xattr */
#define OBD_MD_FLXATTRLS     (0x0000002000000000ULL) /* xattr list */
#define OBD_MD_FLXATTRRM     (0x0000004000000000ULL) /* xattr remove */
#define OBD_MD_FLACL         (0x0000008000000000ULL) /* ACL */
/*      OBD_MD_FLRMTPERM     (0x0000010000000000ULL) remote perm, obsolete */
#define OBD_MD_FLMDSCAPA     (0x0000020000000000ULL) /* MDS capability */
#define OBD_MD_FLOSSCAPA     (0x0000040000000000ULL) /* OSS capability */
#define OBD_MD_FLCKSPLIT     (0x0000080000000000ULL) /* Check split on server */
#define OBD_MD_FLCROSSREF    (0x0000100000000000ULL) /* Cross-ref case */
#define OBD_MD_FLGETATTRLOCK (0x0000200000000000ULL) /* Get IOEpoch attributes
                                                      * under lock; for xattr
                                                      * requests means the
                                                      * client holds the lock */
#define OBD_MD_FLOBJCOUNT    (0x0000400000000000ULL) /* for multiple destroy */

#define OBD_MD_FLDATAVERSION (0x0010000000000000ULL) /* iversion sum */
#define OBD_MD_CLOSE_INTENT_EXECED (0x0020000000000000ULL) /* close intent
                                                              executed */

#define OBD_MD_DEFAULT_MEA   (0x0040000000000000ULL) /* default MEA */
#define OBD_MD_FLOSTLAYOUT   (0x0080000000000000ULL) /* contain ost_layout */

#define OBD_MD_FLALLQUOTA (OBD_MD_FLUSRQUOTA | \
                           OBD_MD_FLGRPQUOTA | \
                           OBD_MD_FLPRJQUOTA)

#define OBD_MD_FLGETATTR (OBD_MD_FLID    | OBD_MD_FLATIME | OBD_MD_FLMTIME | \
                          OBD_MD_FLCTIME | OBD_MD_FLSIZE  | OBD_MD_FLBLKSZ | \
                          OBD_MD_FLMODE  | OBD_MD_FLTYPE  | OBD_MD_FLUID   | \
                          OBD_MD_FLGID   | OBD_MD_FLFLAGS | OBD_MD_FLNLINK | \
                          OBD_MD_FLGENER | OBD_MD_FLRDEV  | OBD_MD_FLGROUP)

#define OBD_MD_FLXATTRALL (OBD_MD_FLXATTR | OBD_MD_FLXATTRLS)

/* don't forget obdo_fid which is way down at the bottom so it can
 * come after the definition of llog_cookie */

enum hss_valid {
        HSS_SETMASK     = 0x01,
        HSS_CLEARMASK   = 0x02,
        HSS_ARCHIVE_ID  = 0x04,
};

struct hsm_state_set {
        __u32   hss_valid;
        __u32   hss_archive_id;
        __u64   hss_setmask;
        __u64   hss_clearmask;
};

/* ost_body.data values for OST_BRW */

#define OBD_BRW_READ            0x01
#define OBD_BRW_WRITE           0x02
#define OBD_BRW_RWMASK          (OBD_BRW_READ | OBD_BRW_WRITE)
#define OBD_BRW_SYNC            0x08 /* this page is a part of synchronous
                                      * transfer and is not accounted in
                                      * the grant. */
#define OBD_BRW_CHECK           0x10
#define OBD_BRW_FROM_GRANT      0x20 /* the osc manages this under llite */
#define OBD_BRW_GRANTED         0x40 /* the ost manages this */
#define OBD_BRW_NOCACHE         0x80 /* this page is a part of non-cached IO */
#define OBD_BRW_NOQUOTA        0x100
#define OBD_BRW_SRVLOCK        0x200 /* Client holds no lock over this page */
#define OBD_BRW_ASYNC          0x400 /* Server may delay commit to disk */
#define OBD_BRW_MEMALLOC       0x800 /* Client runs in the "kswapd" context */
#define OBD_BRW_OVER_USRQUOTA 0x1000 /* Running out of user quota */
#define OBD_BRW_OVER_GRPQUOTA 0x2000 /* Running out of group quota */
#define OBD_BRW_SOFT_SYNC     0x4000 /* This flag notifies the server
                                      * that the client is running low on
                                      * space for unstable pages; asking
                                      * it to sync quickly */
#define OBD_BRW_OVER_PRJQUOTA 0x8000 /* Running out of project quota */

#define OBD_BRW_OVER_ALLQUOTA (OBD_BRW_OVER_USRQUOTA | \
                               OBD_BRW_OVER_GRPQUOTA | \
                               OBD_BRW_OVER_PRJQUOTA)

#define OBD_OBJECT_EOF LUSTRE_EOF

#define OST_MIN_PRECREATE 32
#define OST_MAX_PRECREATE 20000

struct obd_ioobj {
        struct ost_id   ioo_oid;        /* object ID, if multi-obj BRW */
        __u32           ioo_max_brw;    /* low 16 bits were o_mode before 2.4,
                                         * now (PTLRPC_BULK_OPS_COUNT - 1) in
                                         * high 16 bits in 2.4 and later */
        __u32           ioo_bufcnt;     /* number of niobufs for this object */
};

/* NOTE: IOOBJ_MAX_BRW_BITS defines the _offset_ of the max_brw field in
 * ioo_max_brw, NOT the maximum number of bits in PTLRPC_BULK_OPS_BITS.
 * That said, ioo_max_brw is a 32-bit field so the limit is also 16 bits. */
#define IOOBJ_MAX_BRW_BITS      16
#define ioobj_max_brw_get(ioo)  (((ioo)->ioo_max_brw >> IOOBJ_MAX_BRW_BITS) + 1)
#define ioobj_max_brw_set(ioo, num)                                     \
do { (ioo)->ioo_max_brw = ((num) - 1) << IOOBJ_MAX_BRW_BITS; } while (0)

/* multiple of 8 bytes => can array */
struct niobuf_remote {
        __u64   rnb_offset;
        __u32   rnb_len;
        __u32   rnb_flags;
};

/* lock value block communicated between the filter and llite */

/* OST_LVB_ERR_INIT is needed because the return code in rc is
 * negative, i.e. because ((MASK + rc) & MASK) != MASK. */
#define OST_LVB_ERR_INIT 0xffbadbad80000000ULL
#define OST_LVB_ERR_MASK 0xffbadbad00000000ULL
#define OST_LVB_IS_ERR(blocks)                                          \
        ((blocks & OST_LVB_ERR_MASK) == OST_LVB_ERR_MASK)
#define OST_LVB_SET_ERR(blocks, rc)                                     \
        do { blocks = OST_LVB_ERR_INIT + rc; } while (0)
#define OST_LVB_GET_ERR(blocks)    (int)(blocks - OST_LVB_ERR_INIT)

struct ost_lvb_v1 {
        __u64   lvb_size;
        __s64   lvb_mtime;
        __s64   lvb_atime;
        __s64   lvb_ctime;
        __u64   lvb_blocks;
};

struct ost_lvb {
        __u64   lvb_size;
        __s64   lvb_mtime;
        __s64   lvb_atime;
        __s64   lvb_ctime;
        __u64   lvb_blocks;
        __u32   lvb_mtime_ns;
        __u32   lvb_atime_ns;
        __u32   lvb_ctime_ns;
        __u32   lvb_padding;
};

/*
 *   lquota data structures
 */

#ifndef QUOTABLOCK_BITS
# define QUOTABLOCK_BITS LUSTRE_QUOTABLOCK_BITS
#endif

#ifndef QUOTABLOCK_SIZE
# define QUOTABLOCK_SIZE LUSTRE_QUOTABLOCK_SIZE
#endif

#ifndef toqb
# define toqb lustre_stoqb
#endif

/* The lquota_id structure is an union of all the possible identifier types that
 * can be used with quota, this includes:
 * - 64-bit user ID
 * - 64-bit group ID
 * - a FID which can be used for per-directory quota in the future */
union lquota_id {
        struct lu_fid   qid_fid; /* FID for per-directory quota */
        __u64           qid_uid; /* user identifier */
        __u64           qid_gid; /* group identifier */
};

/* quotactl management */
struct obd_quotactl {
        __u32                   qc_cmd;
        __u32                   qc_type; /* see Q_* flag below */
        __u32                   qc_id;
        __u32                   qc_stat;
        struct obd_dqinfo       qc_dqinfo;
        struct obd_dqblk        qc_dqblk;
};

#define Q_COPY(out, in, member) (out)->member = (in)->member

#define QCTL_COPY(out, in)              \
do {                                    \
        Q_COPY(out, in, qc_cmd);        \
        Q_COPY(out, in, qc_type);       \
        Q_COPY(out, in, qc_id);         \
        Q_COPY(out, in, qc_stat);       \
        Q_COPY(out, in, qc_dqinfo);     \
        Q_COPY(out, in, qc_dqblk);      \
} while (0)

/* Body of quota request used for quota acquire/release RPCs between quota
 * master (aka QMT) and slaves (ak QSD). */
struct quota_body {
        struct lu_fid   qb_fid;     /* FID of global index packing the pool ID
                                      * and type (data or metadata) as well as
                                      * the quota type (user or group). */
        union lquota_id qb_id;      /* uid or gid or directory FID */
        __u32           qb_flags;   /* see below */
        __u32           qb_padding;
        __u64           qb_count;   /* acquire/release count (kbytes/inodes) */
        __u64           qb_usage;   /* current slave usage (kbytes/inodes) */
        __u64           qb_slv_ver; /* slave index file version */
        struct lustre_handle    qb_lockh;     /* per-ID lock handle */
        struct lustre_handle    qb_glb_lockh; /* global lock handle */
        __u64           qb_padding1[4];
};

/* When the quota_body is used in the reply of quota global intent
 * lock (IT_QUOTA_CONN) reply, qb_fid contains slave index file FID. */
#define qb_slv_fid      qb_fid
/* qb_usage is the current qunit (in kbytes/inodes) when quota_body is used in
 * quota reply */
#define qb_qunit        qb_usage

#define QUOTA_DQACQ_FL_ACQ      0x1  /* acquire quota */
#define QUOTA_DQACQ_FL_PREACQ   0x2  /* pre-acquire */
#define QUOTA_DQACQ_FL_REL      0x4  /* release quota */
#define QUOTA_DQACQ_FL_REPORT   0x8  /* report usage */

/* Quota types currently supported */
enum {
        LQUOTA_TYPE_USR = 0x00, /* maps to USRQUOTA */
        LQUOTA_TYPE_GRP = 0x01, /* maps to GRPQUOTA */
        LQUOTA_TYPE_PRJ = 0x02, /* maps to PRJQUOTA */
        LQUOTA_TYPE_MAX
};

/* There are 2 different resource types on which a quota limit can be enforced:
 * - inodes on the MDTs
 * - blocks on the OSTs */
enum {
        LQUOTA_RES_MD           = 0x01, /* skip 0 to avoid null oid in FID */
        LQUOTA_RES_DT           = 0x02,
        LQUOTA_LAST_RES,
        LQUOTA_FIRST_RES        = LQUOTA_RES_MD
};
#define LQUOTA_NR_RES (LQUOTA_LAST_RES - LQUOTA_FIRST_RES + 1)

/*
 * Space accounting support
 * Format of an accounting record, providing disk usage information for a given
 * user or group
 */
struct lquota_acct_rec { /* 16 bytes */
        __u64 bspace;  /* current space in use */
        __u64 ispace;  /* current # inodes in use */
};

/*
 * Global quota index support
 * Format of a global record, providing global quota settings for a given quota
 * identifier
 */
struct lquota_glb_rec { /* 32 bytes */
        __u64 qbr_hardlimit; /* quota hard limit, in #inodes or kbytes */
        __u64 qbr_softlimit; /* quota soft limit, in #inodes or kbytes */
        __u64 qbr_time;      /* grace time, in seconds */
        __u64 qbr_granted;   /* how much is granted to slaves, in #inodes or
                              * kbytes */
};

/*
 * Slave index support
 * Format of a slave record, recording how much space is granted to a given
 * slave
 */
struct lquota_slv_rec { /* 8 bytes */
        __u64 qsr_granted; /* space granted to the slave for the key=ID,
                            * in #inodes or kbytes */
};

/* Data structures associated with the quota locks */

/* Glimpse descriptor used for the index & per-ID quota locks */
struct ldlm_gl_lquota_desc {
        union lquota_id gl_id;    /* quota ID subject to the glimpse */
        __u64           gl_flags; /* see LQUOTA_FL* below */
        __u64           gl_ver;   /* new index version */
        __u64           gl_hardlimit; /* new hardlimit or qunit value */
        __u64           gl_softlimit; /* new softlimit */
        __u64           gl_time;
        __u64           gl_pad2;
};
#define gl_qunit        gl_hardlimit /* current qunit value used when
                                      * glimpsing per-ID quota locks */

/* quota glimpse flags */
#define LQUOTA_FL_EDQUOT 0x1 /* user/group out of quota space on QMT */

/* LVB used with quota (global and per-ID) locks */
struct lquota_lvb {
        __u64   lvb_flags;      /* see LQUOTA_FL* above */
        __u64   lvb_id_may_rel; /* space that might be released later */
        __u64   lvb_id_rel;     /* space released by the slave for this ID */
        __u64   lvb_id_qunit;   /* current qunit value */
        __u64   lvb_pad1;
};

/* LVB used with global quota lock */
#define lvb_glb_ver  lvb_id_may_rel /* current version of the global index */

/* op codes */
typedef enum {
        QUOTA_DQACQ     = 601,
        QUOTA_DQREL     = 602,
        QUOTA_LAST_OPC
} quota_cmd_t;
#define QUOTA_FIRST_OPC QUOTA_DQACQ

/*
 *   MDS REQ RECORDS
 */

/* opcodes */
typedef enum {
        MDS_GETATTR             = 33,
        MDS_GETATTR_NAME        = 34,
        MDS_CLOSE               = 35,
        MDS_REINT               = 36,
        MDS_READPAGE            = 37,
        MDS_CONNECT             = 38,
        MDS_DISCONNECT          = 39,
        MDS_GET_ROOT            = 40,
        MDS_STATFS              = 41,
        MDS_PIN                 = 42, /* obsolete, never used in a release */
        MDS_UNPIN               = 43, /* obsolete, never used in a release */
        MDS_SYNC                = 44,
        MDS_DONE_WRITING        = 45, /* obsolete since 2.8.0 */
        MDS_SET_INFO            = 46,
        MDS_QUOTACHECK          = 47, /* not used since 2.4 */
        MDS_QUOTACTL            = 48,
        MDS_GETXATTR            = 49,
        MDS_SETXATTR            = 50, /* obsolete, now it's MDS_REINT op */
        MDS_WRITEPAGE           = 51,
        MDS_IS_SUBDIR           = 52, /* obsolete, never used in a release */
        MDS_GET_INFO            = 53,
        MDS_HSM_STATE_GET       = 54,
        MDS_HSM_STATE_SET       = 55,
        MDS_HSM_ACTION          = 56,
        MDS_HSM_PROGRESS        = 57,
        MDS_HSM_REQUEST         = 58,
        MDS_HSM_CT_REGISTER     = 59,
        MDS_HSM_CT_UNREGISTER   = 60,
        MDS_SWAP_LAYOUTS        = 61,
        MDS_LAST_OPC
} mds_cmd_t;

#define MDS_FIRST_OPC    MDS_GETATTR


/* opcodes for object update */
typedef enum {
        OUT_UPDATE      = 1000,
        OUT_UPDATE_LAST_OPC
} update_cmd_t;

#define OUT_UPDATE_FIRST_OPC    OUT_UPDATE

/*
 * Do not exceed 63
 */

typedef enum {
        REINT_SETATTR  = 1,
        REINT_CREATE   = 2,
        REINT_LINK     = 3,
        REINT_UNLINK   = 4,
        REINT_RENAME   = 5,
        REINT_OPEN     = 6,
        REINT_SETXATTR = 7,
        REINT_RMENTRY  = 8,
        REINT_MIGRATE  = 9,
        REINT_MAX
} mds_reint_t, mdt_reint_t;

/* the disposition of the intent outlines what was executed */
#define DISP_IT_EXECD        0x00000001
#define DISP_LOOKUP_EXECD    0x00000002
#define DISP_LOOKUP_NEG      0x00000004
#define DISP_LOOKUP_POS      0x00000008
#define DISP_OPEN_CREATE     0x00000010
#define DISP_OPEN_OPEN       0x00000020
#define DISP_ENQ_COMPLETE    0x00400000         /* obsolete and unused */
#define DISP_ENQ_OPEN_REF    0x00800000
#define DISP_ENQ_CREATE_REF  0x01000000
#define DISP_OPEN_LOCK       0x02000000
#define DISP_OPEN_LEASE      0x04000000
#define DISP_OPEN_STRIPE     0x08000000
#define DISP_OPEN_DENY       0x10000000

/* INODE LOCK PARTS */
#define MDS_INODELOCK_LOOKUP 0x000001   /* For namespace, dentry etc, and also
                                         * was used to protect permission (mode,
                                         * owner, group etc) before 2.4. */
#define MDS_INODELOCK_UPDATE 0x000002   /* size, links, timestamps */
#define MDS_INODELOCK_OPEN   0x000004   /* For opened files */
#define MDS_INODELOCK_LAYOUT 0x000008   /* for layout */

/* The PERM bit is added int 2.4, and it is used to protect permission(mode,
 * owner, group, acl etc), so to separate the permission from LOOKUP lock.
 * Because for remote directories(in DNE), these locks will be granted by
 * different MDTs(different ldlm namespace).
 *
 * For local directory, MDT will always grant UPDATE_LOCK|PERM_LOCK together.
 * For Remote directory, the master MDT, where the remote directory is, will
 * grant UPDATE_LOCK|PERM_LOCK, and the remote MDT, where the name entry is,
 * will grant LOOKUP_LOCK. */
#define MDS_INODELOCK_PERM   0x000010
#define MDS_INODELOCK_XATTR  0x000020   /* extended attributes */

#define MDS_INODELOCK_MAXSHIFT 5
/* This FULL lock is useful to take on unlink sort of operations */
#define MDS_INODELOCK_FULL ((1<<(MDS_INODELOCK_MAXSHIFT+1))-1)

/* NOTE: until Lustre 1.8.7/2.1.1 the fid_ver() was packed into name[2],
 * but was moved into name[1] along with the OID to avoid consuming the
 * name[2,3] fields that need to be used for the quota id (also a FID). */
enum {
        LUSTRE_RES_ID_SEQ_OFF = 0,
        LUSTRE_RES_ID_VER_OID_OFF = 1,
        LUSTRE_RES_ID_WAS_VER_OFF = 2, /* see note above */
        LUSTRE_RES_ID_QUOTA_SEQ_OFF = 2,
        LUSTRE_RES_ID_QUOTA_VER_OID_OFF = 3,
        LUSTRE_RES_ID_HSH_OFF = 3
};

#define MDS_STATUS_CONN 1
#define MDS_STATUS_LOV 2

enum {
        /* these should be identical to their EXT4_*_FL counterparts, they are
         * redefined here only to avoid dragging in fs/ext4/ext4.h */
        LUSTRE_SYNC_FL = 0x00000008, /* Synchronous updates */
        LUSTRE_IMMUTABLE_FL = 0x00000010, /* Immutable file */
        LUSTRE_APPEND_FL = 0x00000020, /* writes to file may only append */
        LUSTRE_NODUMP_FL = 0x00000040, /* do not dump file */
        LUSTRE_NOATIME_FL = 0x00000080, /* do not update atime */
        LUSTRE_INDEX_FL = 0x00001000, /* hash-indexed directory */
        LUSTRE_DIRSYNC_FL = 0x00010000, /* dirsync behaviour (dir only) */
        LUSTRE_TOPDIR_FL = 0x00020000, /* Top of directory hierarchies*/
        LUSTRE_DIRECTIO_FL = 0x00100000, /* Use direct i/o */
        LUSTRE_INLINE_DATA_FL = 0x10000000, /* Inode has inline data. */

        /* These flags will not be identical to any EXT4_*_FL counterparts,
         * and only reserved for lustre purpose. Note: these flags might
         * be conflict with some of EXT4 flags, so
         * 1. these conflict flags needs to be removed when the flag is
         * wired by la_flags see osd_attr_get().
         * 2. If these flags needs to be stored into inode, they will be
         * stored in LMA. see LMAI_XXXX */
        LUSTRE_ORPHAN_FL = 0x00002000,

        LUSTRE_LMA_FL_MASKS = LUSTRE_ORPHAN_FL,
};

#ifdef __KERNEL__
/* Convert wire LUSTRE_*_FL to corresponding client local VFS S_* values
 * for the client inode i_flags.  The LUSTRE_*_FL are the Lustre wire
 * protocol equivalents of LDISKFS_*_FL values stored on disk, while
 * the S_* flags are kernel-internal values that change between kernel
 * versions.  These flags are set/cleared via FSFILT_IOC_{GET,SET}_FLAGS.
 * See b=16526 for a full history. */
static inline int ll_ext_to_inode_flags(int flags)
{
        return (((flags & LUSTRE_SYNC_FL)      ? S_SYNC      : 0) |
                ((flags & LUSTRE_NOATIME_FL)   ? S_NOATIME   : 0) |
                ((flags & LUSTRE_APPEND_FL)    ? S_APPEND    : 0) |
#if defined(S_DIRSYNC)
                ((flags & LUSTRE_DIRSYNC_FL)   ? S_DIRSYNC   : 0) |
#endif
                ((flags & LUSTRE_IMMUTABLE_FL) ? S_IMMUTABLE : 0));
}

static inline int ll_inode_to_ext_flags(int iflags)
{
        return (((iflags & S_SYNC)      ? LUSTRE_SYNC_FL      : 0) |
                ((iflags & S_NOATIME)   ? LUSTRE_NOATIME_FL   : 0) |
                ((iflags & S_APPEND)    ? LUSTRE_APPEND_FL    : 0) |
#if defined(S_DIRSYNC)
                ((iflags & S_DIRSYNC)   ? LUSTRE_DIRSYNC_FL   : 0) |
#endif
                ((iflags & S_IMMUTABLE) ? LUSTRE_IMMUTABLE_FL : 0));
}
#endif

/* 64 possible states */
enum md_transient_state {
        MS_RESTORE      = (1 << 0),     /* restore is running */
};

struct mdt_body {
        struct lu_fid mbo_fid1;
        struct lu_fid mbo_fid2;
        struct lustre_handle mbo_handle;
        __u64   mbo_valid;
        __u64   mbo_size; /* Offset, in the case of MDS_READPAGE */
        __s64   mbo_mtime;
        __s64   mbo_atime;
        __s64   mbo_ctime;
        __u64   mbo_blocks; /* XID, in the case of MDS_READPAGE */
        __u64   mbo_ioepoch;
        __u64   mbo_t_state; /* transient file state defined in
                              * enum md_transient_state
                              * was "ino" until 2.4.0 */
        __u32   mbo_fsuid;
        __u32   mbo_fsgid;
        __u32   mbo_capability;
        __u32   mbo_mode;
        __u32   mbo_uid;
        __u32   mbo_gid;
        __u32   mbo_flags;   /* LUSTRE_*_FL file attributes */
        __u32   mbo_rdev;
        __u32   mbo_nlink; /* #bytes to read in the case of MDS_READPAGE */
        __u32   mbo_unused2; /* was "generation" until 2.4.0 */
        __u32   mbo_suppgid;
        __u32   mbo_eadatasize;
        __u32   mbo_aclsize;
        __u32   mbo_max_mdsize;
        __u32   mbo_unused3; /* was max_cookiesize until 2.8 */
        __u32   mbo_uid_h; /* high 32-bits of uid, for FUID */
        __u32   mbo_gid_h; /* high 32-bits of gid, for FUID */
        __u32   mbo_padding_5; /* also fix lustre_swab_mdt_body */
        __u64   mbo_padding_6;
        __u64   mbo_padding_7;
        __u64   mbo_padding_8;
        __u64   mbo_padding_9;
        __u64   mbo_padding_10;
}; /* 216 */

struct mdt_ioepoch {
        struct lustre_handle mio_handle;
        __u64 mio_unused1; /* was ioepoch */
        __u32 mio_unused2; /* was flags */
        __u32 mio_padding;
};

/* permissions for md_perm.mp_perm */
enum {
        CFS_SETUID_PERM = 0x01,
        CFS_SETGID_PERM = 0x02,
        CFS_SETGRP_PERM = 0x04,
};

struct mdt_rec_setattr {
        __u32           sa_opcode;
        __u32           sa_cap;
        __u32           sa_fsuid;
        __u32           sa_fsuid_h;
        __u32           sa_fsgid;
        __u32           sa_fsgid_h;
        __u32           sa_suppgid;
        __u32           sa_suppgid_h;
        __u32           sa_padding_1;
        __u32           sa_padding_1_h;
        struct lu_fid   sa_fid;
        __u64           sa_valid;
        __u32           sa_uid;
        __u32           sa_gid;
        __u64           sa_size;
        __u64           sa_blocks;
        __s64           sa_mtime;
        __s64           sa_atime;
        __s64           sa_ctime;
        __u32           sa_attr_flags;
        __u32           sa_mode;
        __u32           sa_bias;      /* some operation flags */
        __u32           sa_padding_3;
        __u32           sa_padding_4;
        __u32           sa_padding_5;
};

/*
 * Attribute flags used in mdt_rec_setattr::sa_valid.
 * The kernel's #defines for ATTR_* should not be used over the network
 * since the client and MDS may run different kernels (see bug 13828)
 * Therefore, we should only use MDS_ATTR_* attributes for sa_valid.
 */
#define MDS_ATTR_MODE          0x1ULL /* = 1 */
#define MDS_ATTR_UID           0x2ULL /* = 2 */
#define MDS_ATTR_GID           0x4ULL /* = 4 */
#define MDS_ATTR_SIZE          0x8ULL /* = 8 */
#define MDS_ATTR_ATIME        0x10ULL /* = 16 */
#define MDS_ATTR_MTIME        0x20ULL /* = 32 */
#define MDS_ATTR_CTIME        0x40ULL /* = 64 */
#define MDS_ATTR_ATIME_SET    0x80ULL /* = 128 */
#define MDS_ATTR_MTIME_SET   0x100ULL /* = 256 */
#define MDS_ATTR_FORCE       0x200ULL /* = 512, Not a change, but a change it */
#define MDS_ATTR_ATTR_FLAG   0x400ULL /* = 1024 */
#define MDS_ATTR_KILL_SUID   0x800ULL /* = 2048 */
#define MDS_ATTR_KILL_SGID  0x1000ULL /* = 4096 */
#define MDS_ATTR_CTIME_SET  0x2000ULL /* = 8192 */
#define MDS_ATTR_FROM_OPEN  0x4000ULL /* = 16384, called from open path, ie O_TRUNC */
#define MDS_ATTR_BLOCKS     0x8000ULL /* = 32768 */

#ifndef FMODE_READ
#define FMODE_READ               00000001
#define FMODE_WRITE              00000002
#endif

#define MDS_FMODE_CLOSED         00000000
#define MDS_FMODE_EXEC           00000004
/*      MDS_FMODE_EPOCH          01000000 obsolete since 2.8.0 */
/*      MDS_FMODE_TRUNC          02000000 obsolete since 2.8.0 */
/*      MDS_FMODE_SOM            04000000 obsolete since 2.8.0 */

#define MDS_OPEN_CREATED         00000010
#define MDS_OPEN_CROSS           00000020

#define MDS_OPEN_CREAT           00000100
#define MDS_OPEN_EXCL            00000200
#define MDS_OPEN_TRUNC           00001000
#define MDS_OPEN_APPEND          00002000
#define MDS_OPEN_SYNC            00010000
#define MDS_OPEN_DIRECTORY       00200000

#define MDS_OPEN_BY_FID         040000000 /* open_by_fid for known object */
#define MDS_OPEN_DELAY_CREATE  0100000000 /* delay initial object create */
#define MDS_OPEN_OWNEROVERRIDE 0200000000 /* NFSD rw-reopen ro file for owner */
#define MDS_OPEN_JOIN_FILE     0400000000 /* open for join file.
                                           * We do not support JOIN FILE
                                           * anymore, reserve this flags
                                           * just for preventing such bit
                                           * to be reused. */

#define MDS_OPEN_LOCK         04000000000 /* This open requires open lock */
#define MDS_OPEN_HAS_EA      010000000000 /* specify object create pattern */
#define MDS_OPEN_HAS_OBJS    020000000000 /* Just set the EA the obj exist */
#define MDS_OPEN_NORESTORE  0100000000000ULL /* Do not restore file at open */
#define MDS_OPEN_NEWSTRIPE  0200000000000ULL /* New stripe needed (restripe or
                                              * hsm restore) */
#define MDS_OPEN_VOLATILE   0400000000000ULL /* File is volatile = created
                                                unlinked */
#define MDS_OPEN_LEASE     01000000000000ULL /* Open the file and grant lease
                                              * delegation, succeed if it's not
                                              * being opened with conflict mode.
                                              */
#define MDS_OPEN_RELEASE   02000000000000ULL /* Open the file for HSM release */

/* lustre internal open flags, which should not be set from user space */
#define MDS_OPEN_FL_INTERNAL (MDS_OPEN_HAS_EA | MDS_OPEN_HAS_OBJS |     \
                              MDS_OPEN_OWNEROVERRIDE | MDS_OPEN_LOCK |  \
                              MDS_OPEN_BY_FID | MDS_OPEN_LEASE |        \
                              MDS_OPEN_RELEASE)

enum mds_op_bias {
        MDS_CHECK_SPLIT         = 1 << 0,
        MDS_CROSS_REF           = 1 << 1,
        MDS_VTX_BYPASS          = 1 << 2,
        MDS_PERM_BYPASS         = 1 << 3,
/*      MDS_SOM                 = 1 << 4, obsolete since 2.8.0 */
        MDS_QUOTA_IGNORE        = 1 << 5,
        /* Was MDS_CLOSE_CLEANUP (1 << 6), No more used */
        MDS_KEEP_ORPHAN         = 1 << 7,
        MDS_RECOV_OPEN          = 1 << 8,
        MDS_DATA_MODIFIED       = 1 << 9,
        MDS_CREATE_VOLATILE     = 1 << 10,
        MDS_OWNEROVERRIDE       = 1 << 11,
        MDS_HSM_RELEASE         = 1 << 12,
        MDS_RENAME_MIGRATE      = 1 << 13,
        MDS_CLOSE_LAYOUT_SWAP   = 1 << 14,
};

/* instance of mdt_reint_rec */
struct mdt_rec_create {
        __u32           cr_opcode;
        __u32           cr_cap;
        __u32           cr_fsuid;
        __u32           cr_fsuid_h;
        __u32           cr_fsgid;
        __u32           cr_fsgid_h;
        __u32           cr_suppgid1;
        __u32           cr_suppgid1_h;
        __u32           cr_suppgid2;
        __u32           cr_suppgid2_h;
        struct lu_fid   cr_fid1;
        struct lu_fid   cr_fid2;
        struct lustre_handle cr_old_handle; /* handle in case of open replay */
        __s64           cr_time;
        __u64           cr_rdev;
        __u64           cr_ioepoch;
        __u64           cr_padding_1;   /* rr_blocks */
        __u32           cr_mode;
        __u32           cr_bias;
        /* use of helpers set/get_mrc_cr_flags() is needed to access
         * 64 bits cr_flags [cr_flags_l, cr_flags_h], this is done to
         * extend cr_flags size without breaking 1.8 compat */
        __u32           cr_flags_l;     /* for use with open, low  32 bits  */
        __u32           cr_flags_h;     /* for use with open, high 32 bits */
        __u32           cr_umask;       /* umask for create */
        __u32           cr_padding_4;   /* rr_padding_4 */
};

/* instance of mdt_reint_rec */
struct mdt_rec_link {
        __u32           lk_opcode;
        __u32           lk_cap;
        __u32           lk_fsuid;
        __u32           lk_fsuid_h;
        __u32           lk_fsgid;
        __u32           lk_fsgid_h;
        __u32           lk_suppgid1;
        __u32           lk_suppgid1_h;
        __u32           lk_suppgid2;
        __u32           lk_suppgid2_h;
        struct lu_fid   lk_fid1;
        struct lu_fid   lk_fid2;
        __s64           lk_time;
        __u64           lk_padding_1;   /* rr_atime */
        __u64           lk_padding_2;   /* rr_ctime */
        __u64           lk_padding_3;   /* rr_size */
        __u64           lk_padding_4;   /* rr_blocks */
        __u32           lk_bias;
        __u32           lk_padding_5;   /* rr_mode */
        __u32           lk_padding_6;   /* rr_flags */
        __u32           lk_padding_7;   /* rr_padding_2 */
        __u32           lk_padding_8;   /* rr_padding_3 */
        __u32           lk_padding_9;   /* rr_padding_4 */
};

/* instance of mdt_reint_rec */
struct mdt_rec_unlink {
        __u32           ul_opcode;
        __u32           ul_cap;
        __u32           ul_fsuid;
        __u32           ul_fsuid_h;
        __u32           ul_fsgid;
        __u32           ul_fsgid_h;
        __u32           ul_suppgid1;
        __u32           ul_suppgid1_h;
        __u32           ul_suppgid2;
        __u32           ul_suppgid2_h;
        struct lu_fid   ul_fid1;
        struct lu_fid   ul_fid2;
        __s64           ul_time;
        __u64           ul_padding_2;   /* rr_atime */
        __u64           ul_padding_3;   /* rr_ctime */
        __u64           ul_padding_4;   /* rr_size */
        __u64           ul_padding_5;   /* rr_blocks */
        __u32           ul_bias;
        __u32           ul_mode;
        __u32           ul_padding_6;   /* rr_flags */
        __u32           ul_padding_7;   /* rr_padding_2 */
        __u32           ul_padding_8;   /* rr_padding_3 */
        __u32           ul_padding_9;   /* rr_padding_4 */
};

/* instance of mdt_reint_rec */
struct mdt_rec_rename {
        __u32           rn_opcode;
        __u32           rn_cap;
        __u32           rn_fsuid;
        __u32           rn_fsuid_h;
        __u32           rn_fsgid;
        __u32           rn_fsgid_h;
        __u32           rn_suppgid1;
        __u32           rn_suppgid1_h;
        __u32           rn_suppgid2;
        __u32           rn_suppgid2_h;
        struct lu_fid   rn_fid1;
        struct lu_fid   rn_fid2;
        __s64           rn_time;
        __u64           rn_padding_1;   /* rr_atime */
        __u64           rn_padding_2;   /* rr_ctime */
        __u64           rn_padding_3;   /* rr_size */
        __u64           rn_padding_4;   /* rr_blocks */
        __u32           rn_bias;        /* some operation flags */
        __u32           rn_mode;        /* cross-ref rename has mode */
        __u32           rn_padding_5;   /* rr_flags */
        __u32           rn_padding_6;   /* rr_padding_2 */
        __u32           rn_padding_7;   /* rr_padding_3 */
        __u32           rn_padding_8;   /* rr_padding_4 */
};

/* instance of mdt_reint_rec */
struct mdt_rec_setxattr {
        __u32           sx_opcode;
        __u32           sx_cap;
        __u32           sx_fsuid;
        __u32           sx_fsuid_h;
        __u32           sx_fsgid;
        __u32           sx_fsgid_h;
        __u32           sx_suppgid1;
        __u32           sx_suppgid1_h;
        __u32           sx_suppgid2;
        __u32           sx_suppgid2_h;
        struct lu_fid   sx_fid;
        __u64           sx_padding_1;   /* These three are rr_fid2 */
        __u32           sx_padding_2;
        __u32           sx_padding_3;
        __u64           sx_valid;
        __s64           sx_time;
        __u64           sx_padding_5;   /* rr_ctime */
        __u64           sx_padding_6;   /* rr_size */
        __u64           sx_padding_7;   /* rr_blocks */
        __u32           sx_size;
        __u32           sx_flags;
        __u32           sx_padding_8;   /* rr_flags */
        __u32           sx_padding_9;   /* rr_padding_2 */
        __u32           sx_padding_10;  /* rr_padding_3 */
        __u32           sx_padding_11;  /* rr_padding_4 */
};

/*
 * mdt_rec_reint is the template for all mdt_reint_xxx structures.
 * Do NOT change the size of various members, otherwise the value
 * will be broken in lustre_swab_mdt_rec_reint().
 *
 * If you add new members in other mdt_reint_xxx structres and need to use the
 * rr_padding_x fields, then update lustre_swab_mdt_rec_reint() also.
 */
struct mdt_rec_reint {
        __u32           rr_opcode;
        __u32           rr_cap;
        __u32           rr_fsuid;
        __u32           rr_fsuid_h;
        __u32           rr_fsgid;
        __u32           rr_fsgid_h;
        __u32           rr_suppgid1;
        __u32           rr_suppgid1_h;
        __u32           rr_suppgid2;
        __u32           rr_suppgid2_h;
        struct lu_fid   rr_fid1;
        struct lu_fid   rr_fid2;
        __s64           rr_mtime;
        __s64           rr_atime;
        __s64           rr_ctime;
        __u64           rr_size;
        __u64           rr_blocks;
        __u32           rr_bias;
        __u32           rr_mode;
        __u32           rr_flags;
        __u32           rr_flags_h;
        __u32           rr_umask;
        __u32           rr_padding_4; /* also fix lustre_swab_mdt_rec_reint */
};

/* lmv structures */
struct lmv_desc {
        __u32 ld_tgt_count;                /* how many MDS's */
        __u32 ld_active_tgt_count;         /* how many active */
        __u32 ld_default_stripe_count;     /* how many objects are used */
        __u32 ld_pattern;                  /* default hash pattern */
        __u64 ld_default_hash_size;
        __u64 ld_padding_1;                /* also fix lustre_swab_lmv_desc */
        __u32 ld_padding_2;                /* also fix lustre_swab_lmv_desc */
        __u32 ld_qos_maxage;               /* in second */
        __u32 ld_padding_3;                /* also fix lustre_swab_lmv_desc */
        __u32 ld_padding_4;                /* also fix lustre_swab_lmv_desc */
        struct obd_uuid ld_uuid;
};

/* LMV layout EA, and it will be stored both in master and slave object */
struct lmv_mds_md_v1 {
        __u32 lmv_magic;
        __u32 lmv_stripe_count;
        __u32 lmv_master_mdt_index;     /* On master object, it is master
                                         * MDT index, on slave object, it
                                         * is stripe index of the slave obj */
        __u32 lmv_hash_type;            /* dir stripe policy, i.e. indicate
                                         * which hash function to be used,
                                         * Note: only lower 16 bits is being
                                         * used for now. Higher 16 bits will
                                         * be used to mark the object status,
                                         * for example migrating or dead. */
        __u32 lmv_layout_version;       /* Used for directory restriping */
        __u32 lmv_padding1;
        __u64 lmv_padding2;
        __u64 lmv_padding3;
        char lmv_pool_name[LOV_MAXPOOLNAME + 1];        /* pool name */
        struct lu_fid lmv_stripe_fids[0];       /* FIDs for each stripe */
};

#define LMV_MAGIC_V1    0x0CD20CD0    /* normal stripe lmv magic */
#define LMV_MAGIC       LMV_MAGIC_V1

/* #define LMV_USER_MAGIC 0x0CD30CD0 */
#define LMV_MAGIC_STRIPE 0x0CD40CD0 /* magic for dir sub_stripe */

/* Right now only the lower part(0-16bits) of lmv_hash_type is being used,
 * and the higher part will be the flag to indicate the status of object,
 * for example the object is being migrated. And the hash function
 * might be interpreted differently with different flags. */
#define LMV_HASH_TYPE_MASK 0x0000ffff

#define LMV_HASH_FLAG_MIGRATION 0x80000000

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 10, 53, 0)
/* Since lustre 2.8, this flag will not be needed, instead this DEAD
 * and orphan flags will be stored in LMA (see LMAI_ORPHAN)
 * Keep this flag just for LFSCK, because it still might meet such
 * flag when it checks the old FS */
#define LMV_HASH_FLAG_DEAD      0x40000000
#endif
#define LMV_HASH_FLAG_BAD_TYPE  0x20000000

/* The striped directory has ever lost its master LMV EA, then LFSCK
 * re-generated it. This flag is used to indicate such case. It is an
 * on-disk flag. */
#define LMV_HASH_FLAG_LOST_LMV  0x10000000

/**
 * The FNV-1a hash algorithm is as follows:
 *      hash = FNV_offset_basis
 *      for each octet_of_data to be hashed
 *              hash = hash XOR octet_of_data
 *              hash = hash × FNV_prime
 *      return hash
 * http://en.wikipedia.org/wiki/Fowler–Noll–Vo_hash_function#FNV-1a_hash
 *
 * http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-reference-source
 * FNV_prime is 2^40 + 2^8 + 0xb3 = 0x100000001b3ULL
 **/
#define LUSTRE_FNV_1A_64_PRIME  0x100000001b3ULL
#define LUSTRE_FNV_1A_64_OFFSET_BIAS 0xcbf29ce484222325ULL
static inline __u64 lustre_hash_fnv_1a_64(const void *buf, size_t size)
{
        __u64 hash = LUSTRE_FNV_1A_64_OFFSET_BIAS;
        const unsigned char *p = buf;
        size_t i;

        for (i = 0; i < size; i++) {
                hash ^= p[i];
                hash *= LUSTRE_FNV_1A_64_PRIME;
        }

        return hash;
}

union lmv_mds_md {
        __u32                    lmv_magic;
        struct lmv_mds_md_v1     lmv_md_v1;
        struct lmv_user_md       lmv_user_md;
};

static inline int lmv_mds_md_size(int stripe_count, unsigned int lmm_magic)
{
        switch (lmm_magic) {
        case LMV_MAGIC_V1:{
                struct lmv_mds_md_v1 *lmm1;

                return sizeof(*lmm1) + stripe_count *
                                       sizeof(lmm1->lmv_stripe_fids[0]);
        }
        default:
                return -EINVAL;
        }
}

static inline int lmv_mds_md_stripe_count_get(const union lmv_mds_md *lmm)
{
        switch (__le32_to_cpu(lmm->lmv_magic)) {
        case LMV_MAGIC_V1:
                return __le32_to_cpu(lmm->lmv_md_v1.lmv_stripe_count);
        case LMV_USER_MAGIC:
                return __le32_to_cpu(lmm->lmv_user_md.lum_stripe_count);
        default:
                return -EINVAL;
        }
}

static inline int lmv_mds_md_hash_type_get(const union lmv_mds_md *lmm)
{
        switch (__le32_to_cpu(lmm->lmv_magic)) {
        case LMV_MAGIC_V1:
                return __le32_to_cpu(lmm->lmv_md_v1.lmv_hash_type);
        case LMV_USER_MAGIC:
                return __le32_to_cpu(lmm->lmv_user_md.lum_hash_type);
        default:
                return -EINVAL;
        }
}

enum fld_rpc_opc {
        FLD_QUERY       = 900,
        FLD_READ        = 901,
        FLD_LAST_OPC,
        FLD_FIRST_OPC   = FLD_QUERY
};

enum seq_rpc_opc {
        SEQ_QUERY                       = 700,
        SEQ_LAST_OPC,
        SEQ_FIRST_OPC                   = SEQ_QUERY
};

enum seq_op {
        SEQ_ALLOC_SUPER = 0,
        SEQ_ALLOC_META = 1
};

enum fld_op {
        FLD_CREATE = 0,
        FLD_DELETE = 1,
        FLD_LOOKUP = 2,
};

/* LFSCK opcodes */
typedef enum {
        LFSCK_NOTIFY            = 1101,
        LFSCK_QUERY             = 1102,
        LFSCK_LAST_OPC,
        LFSCK_FIRST_OPC         = LFSCK_NOTIFY
} lfsck_cmd_t;

/*
 *  LOV data structures
 */

#define LOV_MAX_UUID_BUFFER_SIZE  8192
/* The size of the buffer the lov/mdc reserves for the
 * array of UUIDs returned by the MDS.  With the current
 * protocol, this will limit the max number of OSTs per LOV */

#define LOV_DESC_MAGIC 0xB0CCDE5C
#define LOV_DESC_QOS_MAXAGE_DEFAULT 5  /* Seconds */
#define LOV_DESC_STRIPE_SIZE_DEFAULT (1 << LNET_MTU_BITS)

/* LOV settings descriptor (should only contain static info) */
struct lov_desc {
        __u32 ld_tgt_count;                /* how many OBD's */
        __u32 ld_active_tgt_count;         /* how many active */
        __u32 ld_default_stripe_count;     /* how many objects are used */
        __u32 ld_pattern;                  /* default PATTERN_RAID0 */
        __u64 ld_default_stripe_size;      /* in bytes */
        __u64 ld_default_stripe_offset;    /* in bytes */
        __u32 ld_padding_0;                /* unused */
        __u32 ld_qos_maxage;               /* in second */
        __u32 ld_padding_1;                /* also fix lustre_swab_lov_desc */
        __u32 ld_padding_2;                /* also fix lustre_swab_lov_desc */
        struct obd_uuid ld_uuid;
};

#define ld_magic ld_active_tgt_count       /* for swabbing from llogs */

/*
 *   LDLM requests:
 */
/* opcodes -- MUST be distinct from OST/MDS opcodes */
typedef enum {
        LDLM_ENQUEUE     = 101,
        LDLM_CONVERT     = 102,
        LDLM_CANCEL      = 103,
        LDLM_BL_CALLBACK = 104,
        LDLM_CP_CALLBACK = 105,
        LDLM_GL_CALLBACK = 106,
        LDLM_SET_INFO    = 107,
        LDLM_LAST_OPC
} ldlm_cmd_t;
#define LDLM_FIRST_OPC LDLM_ENQUEUE

#define RES_NAME_SIZE 4
struct ldlm_res_id {
        __u64 name[RES_NAME_SIZE];
};

#define DLDLMRES        "[%#llx:%#llx:%#llx].%#llx"
#define PLDLMRES(res)   (unsigned long long)(res)->lr_name.name[0],     \
                        (unsigned long long)(res)->lr_name.name[1],     \
                        (unsigned long long)(res)->lr_name.name[2],     \
                        (unsigned long long)(res)->lr_name.name[3]

/* lock types */
typedef enum ldlm_mode {
        LCK_MINMODE     = 0,
        LCK_EX          = 1,
        LCK_PW          = 2,
        LCK_PR          = 4,
        LCK_CW          = 8,
        LCK_CR          = 16,
        LCK_NL          = 32,
        LCK_GROUP       = 64,
        LCK_COS         = 128,
        LCK_MAXMODE
} ldlm_mode_t;

#define LCK_MODE_NUM    8

typedef enum ldlm_type {
        LDLM_PLAIN      = 10,
        LDLM_EXTENT     = 11,
        LDLM_FLOCK      = 12,
        LDLM_IBITS      = 13,
        LDLM_MAX_TYPE
} ldlm_type_t;

#define LDLM_MIN_TYPE LDLM_PLAIN

struct ldlm_extent {
        __u64 start;
        __u64 end;
        __u64 gid;
};

struct ldlm_inodebits {
        __u64 bits;
};

struct ldlm_flock_wire {
        __u64 lfw_start;
        __u64 lfw_end;
        __u64 lfw_owner;
        __u32 lfw_padding;
        __u32 lfw_pid;
};

/* it's important that the fields of the ldlm_extent structure match
 * the first fields of the ldlm_flock structure because there is only
 * one ldlm_swab routine to process the ldlm_policy_data_t union. if
 * this ever changes we will need to swab the union differently based
 * on the resource type. */

typedef union ldlm_wire_policy_data {
        struct ldlm_extent      l_extent;
        struct ldlm_flock_wire  l_flock;
        struct ldlm_inodebits   l_inodebits;
} ldlm_wire_policy_data_t;

struct barrier_lvb {
        __u32   lvb_status;
        __u32   lvb_index;
        __u64   lvb_padding;
};

struct ldlm_gl_barrier_desc {
        __u32   lgbd_status;
        __u32   lgbd_timeout;
        __u64   lgbd_padding;
};

union ldlm_gl_desc {
        struct ldlm_gl_lquota_desc      lquota_desc;
        struct ldlm_gl_barrier_desc     barrier_desc;
};

enum ldlm_intent_flags {
        IT_OPEN        = 0x00000001,
        IT_CREAT       = 0x00000002,
        IT_OPEN_CREAT  = 0x00000003,
        IT_READDIR     = 0x00000004,
        IT_GETATTR     = 0x00000008,
        IT_LOOKUP      = 0x00000010,
        IT_UNLINK      = 0x00000020,
        IT_TRUNC       = 0x00000040,
        IT_GETXATTR    = 0x00000080,
        IT_EXEC        = 0x00000100,
        IT_PIN         = 0x00000200,
        IT_LAYOUT      = 0x00000400,
        IT_QUOTA_DQACQ = 0x00000800,
        IT_QUOTA_CONN  = 0x00001000,
        IT_SETXATTR    = 0x00002000,
};

struct ldlm_intent {
        __u64 opc;
};

struct ldlm_resource_desc {
        enum ldlm_type     lr_type;
        __u32              lr_pad; /* also fix lustre_swab_ldlm_resource_desc */
        struct ldlm_res_id lr_name;
};

struct ldlm_lock_desc {
        struct ldlm_resource_desc l_resource;
        enum ldlm_mode l_req_mode;
        enum ldlm_mode l_granted_mode;
        union ldlm_wire_policy_data l_policy_data;
};

#define LDLM_LOCKREQ_HANDLES 2
#define LDLM_ENQUEUE_CANCEL_OFF 1

struct ldlm_request {
        __u32 lock_flags;
        __u32 lock_count;
        struct ldlm_lock_desc lock_desc;
        struct lustre_handle lock_handle[LDLM_LOCKREQ_HANDLES];
};

struct ldlm_reply {
        __u32 lock_flags;
        __u32 lock_padding;     /* also fix lustre_swab_ldlm_reply */
        struct ldlm_lock_desc lock_desc;
        struct lustre_handle lock_handle;
        __u64  lock_policy_res1;
        __u64  lock_policy_res2;
};

#define ldlm_flags_to_wire(flags)    ((__u32)(flags))
#define ldlm_flags_from_wire(flags)  ((__u64)(flags))

/*
 * Opcodes for mountconf (mgs and mgc)
 */
typedef enum {
        MGS_CONNECT = 250,
        MGS_DISCONNECT,
        MGS_EXCEPTION,         /* node died, etc. */
        MGS_TARGET_REG,        /* whenever target starts up */
        MGS_TARGET_DEL,
        MGS_SET_INFO,
        MGS_CONFIG_READ,
        MGS_LAST_OPC
} mgs_cmd_t;
#define MGS_FIRST_OPC MGS_CONNECT

#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 13, 53, 0)
#define MGS_PARAM_MAXLEN 1024
#define KEY_SET_INFO "set_info"

struct mgs_send_param {
        char             mgs_param[MGS_PARAM_MAXLEN];
};
#endif

/* We pass this info to the MGS so it can write config logs */
#define MTI_NAME_MAXLEN  64
#define MTI_PARAM_MAXLEN 4096
#define MTI_NIDS_MAX     32
struct mgs_target_info {
        __u32            mti_lustre_ver;
        __u32            mti_stripe_index;
        __u32            mti_config_ver;
        __u32            mti_flags;
        __u32            mti_nid_count;
        __u32            mti_instance; /* Running instance of target */
        char             mti_fsname[MTI_NAME_MAXLEN];
        char             mti_svname[MTI_NAME_MAXLEN];
        char             mti_uuid[sizeof(struct obd_uuid)];
        __u64            mti_nids[MTI_NIDS_MAX];     /* host nids (lnet_nid_t)*/
        char             mti_params[MTI_PARAM_MAXLEN];
};

struct mgs_nidtbl_entry {
        __u64           mne_version;    /* table version of this entry */
        __u32           mne_instance;   /* target instance # */
        __u32           mne_index;      /* target index */
        __u32           mne_length;     /* length of this entry - by bytes */
        __u8            mne_type;       /* target type LDD_F_SV_TYPE_OST/MDT */
        __u8            mne_nid_type;   /* type of nid(mbz). for ipv6. */
        __u8            mne_nid_size;   /* size of each NID, by bytes */
        __u8            mne_nid_count;  /* # of NIDs in buffer */
        union {
                lnet_nid_t nids[0];     /* variable size buffer for NIDs. */
        } u;
};

enum {
        CONFIG_T_CONFIG  = 0,
        CONFIG_T_SPTLRPC = 1,
        CONFIG_T_RECOVER = 2,
        CONFIG_T_PARAMS  = 3,
        CONFIG_T_NODEMAP = 4,
        CONFIG_T_BARRIER = 5,
        CONFIG_T_MAX
};

struct mgs_config_body {
        char     mcb_name[MTI_NAME_MAXLEN]; /* logname */
        __u64    mcb_offset;    /* next index of config log to request */
        __u16    mcb_type;      /* type of log: CONFIG_T_[CONFIG|RECOVER] */
        __u8     mcb_nm_cur_pass;
        __u8     mcb_bits;      /* bits unit size of config log */
        __u32    mcb_units;     /* # of units for bulk transfer */
};

struct mgs_config_res {
        __u64    mcr_offset;    /* index of last config log */
        union {
                __u64    mcr_size;              /* size of the log */
                __u64    mcr_nm_cur_pass;       /* current nodemap config pass */
        };
};

/* Config marker flags (in config log) */
#define CM_START       0x01
#define CM_END         0x02
#define CM_SKIP        0x04
#define CM_UPGRADE146  0x08
#define CM_EXCLUDE     0x10
#define CM_START_SKIP (CM_START | CM_SKIP)

struct cfg_marker {
        __u32   cm_step;       /* aka config version */
        __u32   cm_flags;
        __u32   cm_vers;       /* lustre release version number */
        __u32   cm_padding;    /* 64 bit align */
        __s64   cm_createtime; /*when this record was first created */
        __s64   cm_canceltime; /*when this record is no longer valid*/
        char    cm_tgtname[MTI_NAME_MAXLEN];
        char    cm_comment[MTI_NAME_MAXLEN];
};

/*
 * Opcodes for multiple servers.
 */

typedef enum {
        OBD_PING = 400,
        OBD_LOG_CANCEL,
        OBD_QC_CALLBACK, /* not used since 2.4 */
        OBD_IDX_READ,
        OBD_LAST_OPC
} obd_cmd_t;
#define OBD_FIRST_OPC OBD_PING

/**
 * llog contexts indices.
 *
 * There is compatibility problem with indexes below, they are not
 * continuous and must keep their numbers for compatibility needs.
 * See LU-5218 for details.
 */
enum llog_ctxt_id {
        LLOG_CONFIG_ORIG_CTXT  =  0,
        LLOG_CONFIG_REPL_CTXT = 1,
        LLOG_MDS_OST_ORIG_CTXT = 2,
        LLOG_MDS_OST_REPL_CTXT = 3, /* kept just to avoid re-assignment */
        LLOG_SIZE_ORIG_CTXT = 4,
        LLOG_SIZE_REPL_CTXT = 5,
        LLOG_TEST_ORIG_CTXT = 8,
        LLOG_TEST_REPL_CTXT = 9, /* kept just to avoid re-assignment */
        LLOG_CHANGELOG_ORIG_CTXT = 12, /**< changelog generation on mdd */
        LLOG_CHANGELOG_REPL_CTXT = 13, /**< changelog access on clients */
        /* for multiple changelog consumers */
        LLOG_CHANGELOG_USER_ORIG_CTXT = 14,
        LLOG_AGENT_ORIG_CTXT = 15, /**< agent requests generation on cdt */
        LLOG_UPDATELOG_ORIG_CTXT = 16, /* update log */
        LLOG_UPDATELOG_REPL_CTXT = 17, /* update log */
        LLOG_MAX_CTXTS
};

/** Identifier for a single log object */
struct llog_logid {
        struct ost_id           lgl_oi;
        __u32                   lgl_ogen;
} __attribute__((packed));

/** Records written to the CATALOGS list */
#define CATLIST "CATALOGS"
struct llog_catid {
        struct llog_logid       lci_logid;
        __u32                   lci_padding1;
        __u32                   lci_padding2;
        __u32                   lci_padding3;
} __attribute__((packed));

/* Log data record types - there is no specific reason that these need to
 * be related to the RPC opcodes, but no reason not to (may be handy later?)
 */
#define LLOG_OP_MAGIC 0x10600000
#define LLOG_OP_MASK  0xfff00000

typedef enum {
        LLOG_PAD_MAGIC          = LLOG_OP_MAGIC | 0x00000,
        OST_SZ_REC              = LLOG_OP_MAGIC | 0x00f00,
        /* OST_RAID1_REC        = LLOG_OP_MAGIC | 0x01000, never used */
        MDS_UNLINK_REC          = LLOG_OP_MAGIC | 0x10000 | (MDS_REINT << 8) |
                                  REINT_UNLINK, /* obsolete after 2.5.0 */
        MDS_UNLINK64_REC        = LLOG_OP_MAGIC | 0x90000 | (MDS_REINT << 8) |
                                  REINT_UNLINK,
        /* MDS_SETATTR_REC      = LLOG_OP_MAGIC | 0x12401, obsolete 1.8.0 */
        MDS_SETATTR64_REC       = LLOG_OP_MAGIC | 0x90000 | (MDS_REINT << 8) |
                                  REINT_SETATTR,
        OBD_CFG_REC             = LLOG_OP_MAGIC | 0x20000,
        /* PTL_CFG_REC          = LLOG_OP_MAGIC | 0x30000, obsolete 1.4.0 */
        LLOG_GEN_REC            = LLOG_OP_MAGIC | 0x40000,
        /* LLOG_JOIN_REC        = LLOG_OP_MAGIC | 0x50000, obsolete  1.8.0 */
        CHANGELOG_REC           = LLOG_OP_MAGIC | 0x60000,
        CHANGELOG_USER_REC      = LLOG_OP_MAGIC | 0x70000,
        HSM_AGENT_REC           = LLOG_OP_MAGIC | 0x80000,
        UPDATE_REC              = LLOG_OP_MAGIC | 0xa0000,
        LLOG_HDR_MAGIC          = LLOG_OP_MAGIC | 0x45539,
        LLOG_LOGID_MAGIC        = LLOG_OP_MAGIC | 0x4553b,
} llog_op_type;

#define LLOG_REC_HDR_NEEDS_SWABBING(r) \
        (((r)->lrh_type & __swab32(LLOG_OP_MASK)) == __swab32(LLOG_OP_MAGIC))

/** Log record header - stored in little endian order.
 * Each record must start with this struct, end with a llog_rec_tail,
 * and be a multiple of 256 bits in size.
 */
struct llog_rec_hdr {
        __u32   lrh_len;
        __u32   lrh_index;
        __u32   lrh_type;
        __u32   lrh_id;
};

struct llog_rec_tail {
        __u32   lrt_len;
        __u32   lrt_index;
};

/* Where data follow just after header */
#define REC_DATA(ptr)                                           \
        ((void *)((char *)ptr + sizeof(struct llog_rec_hdr)))

#define REC_DATA_LEN(rec)                                       \
        (rec->lrh_len - sizeof(struct llog_rec_hdr) -           \
         sizeof(struct llog_rec_tail))

struct llog_logid_rec {
        struct llog_rec_hdr     lid_hdr;
        struct llog_logid       lid_id;
        __u32                   lid_padding1;
        __u64                   lid_padding2;
        __u64                   lid_padding3;
        struct llog_rec_tail    lid_tail;
} __attribute__((packed));

struct llog_unlink_rec {
        struct llog_rec_hdr     lur_hdr;
        __u64                   lur_oid;
        __u32                   lur_oseq;
        __u32                   lur_count;
        struct llog_rec_tail    lur_tail;
} __attribute__((packed));

struct llog_unlink64_rec {
        struct llog_rec_hdr     lur_hdr;
        struct lu_fid           lur_fid;
        __u32                   lur_count; /* to destroy the lost precreated */
        __u32                   lur_padding1;
        __u64                   lur_padding2;
        __u64                   lur_padding3;
        struct llog_rec_tail    lur_tail;
} __attribute__((packed));

struct llog_setattr64_rec {
        struct llog_rec_hdr     lsr_hdr;
        struct ost_id           lsr_oi;
        __u32                   lsr_uid;
        __u32                   lsr_uid_h;
        __u32                   lsr_gid;
        __u32                   lsr_gid_h;
        __u64                   lsr_valid;
        struct llog_rec_tail    lsr_tail;
} __attribute__((packed));

struct llog_size_change_rec {
        struct llog_rec_hdr     lsc_hdr;
        struct ll_fid           lsc_fid;
        __u32                   lsc_ioepoch;
        __u32                   lsc_padding1;
        __u64                   lsc_padding2;
        __u64                   lsc_padding3;
        struct llog_rec_tail    lsc_tail;
} __attribute__((packed));

#define CHANGELOG_MAGIC 0xca103000

/** \a changelog_rec_type's that can't be masked */
#define CHANGELOG_MINMASK (1 << CL_MARK)
/** bits covering all \a changelog_rec_type's */
#define CHANGELOG_ALLMASK 0XFFFFFFFF
/** default \a changelog_rec_type mask. Allow all of them, except
 * CL_ATIME since it can really be time consuming, and not necessary
 * under normal use. */
#define CHANGELOG_DEFMASK (CHANGELOG_ALLMASK & ~(1 << CL_ATIME))

/* changelog llog name, needed by client replicators */
#define CHANGELOG_CATALOG "changelog_catalog"

struct changelog_setinfo {
        __u64 cs_recno;
        __u32 cs_id;
} __attribute__((packed));

/** changelog record */
struct llog_changelog_rec {
        struct llog_rec_hdr  cr_hdr;
        struct changelog_rec cr; /**< Variable length field */
        struct llog_rec_tail cr_do_not_use; /**< for_sizeof_only */
} __attribute__((packed));

#define CHANGELOG_USER_PREFIX "cl"

struct llog_changelog_user_rec {
        struct llog_rec_hdr   cur_hdr;
        __u32                 cur_id;
        __u32                 cur_padding;
        __u64                 cur_endrec;
        struct llog_rec_tail  cur_tail;
} __attribute__((packed));

enum agent_req_status {
        ARS_WAITING,
        ARS_STARTED,
        ARS_FAILED,
        ARS_CANCELED,
        ARS_SUCCEED,
};

static inline const char *agent_req_status2name(enum agent_req_status ars)
{
        switch (ars) {
        case ARS_WAITING:
                return "WAITING";
        case ARS_STARTED:
                return "STARTED";
        case ARS_FAILED:
                return "FAILED";
        case ARS_CANCELED:
                return "CANCELED";
        case ARS_SUCCEED:
                return "SUCCEED";
        default:
                return "UNKNOWN";
        }
}

struct llog_agent_req_rec {
        struct llog_rec_hdr     arr_hdr;        /**< record header */
        __u32                   arr_status;     /**< status of the request */
                                                /* must match enum
                                                 * agent_req_status */
        __u32                   arr_archive_id; /**< backend archive number */
        __u64                   arr_flags;      /**< req flags */
        __u64                   arr_compound_id;        /**< compound cookie */
        __u64                   arr_req_create; /**< req. creation time */
        __u64                   arr_req_change; /**< req. status change time */
        struct hsm_action_item  arr_hai;        /**< req. to the agent */
        struct llog_rec_tail    arr_tail; /**< record tail for_sizezof_only */
} __attribute__((packed));

/* Old llog gen for compatibility */
struct llog_gen {
        __u64 mnt_cnt;
        __u64 conn_cnt;
} __attribute__((packed));

struct llog_gen_rec {
        struct llog_rec_hdr     lgr_hdr;
        struct llog_gen         lgr_gen;
        __u64                   padding1;
        __u64                   padding2;
        __u64                   padding3;
        struct llog_rec_tail    lgr_tail;
};

/* flags for the logs */
enum llog_flag {
        LLOG_F_ZAP_WHEN_EMPTY   = 0x1,
        LLOG_F_IS_CAT           = 0x2,
        LLOG_F_IS_PLAIN         = 0x4,
        LLOG_F_EXT_JOBID        = 0x8,
        LLOG_F_IS_FIXSIZE       = 0x10,

        /* Note: Flags covered by LLOG_F_EXT_MASK will be inherited from
         * catlog to plain log, so do not add LLOG_F_IS_FIXSIZE here,
         * because the catlog record is usually fixed size, but its plain
         * log record can be variable */
        LLOG_F_EXT_MASK = LLOG_F_EXT_JOBID,
};

/* On-disk header structure of each log object, stored in little endian order */
#define LLOG_MIN_CHUNK_SIZE     8192
#define LLOG_HEADER_SIZE        (96) /* sizeof (llog_log_hdr) + sizeof(llh_tail)
                                      * - sizeof(llh_bitmap) */
#define LLOG_BITMAP_BYTES       (LLOG_MIN_CHUNK_SIZE - LLOG_HEADER_SIZE)
#define LLOG_MIN_REC_SIZE       (24) /* round(llog_rec_hdr + llog_rec_tail) */

struct llog_log_hdr {
        struct llog_rec_hdr     llh_hdr;
        __s64                   llh_timestamp;
        __u32                   llh_count;
        __u32                   llh_bitmap_offset;
        __u32                   llh_size;
        __u32                   llh_flags;
        /* for a catalog the first/oldest and still in-use plain slot is just
         * next to it. It will serve as the upper limit after Catalog has
         * wrapped around */
        __u32                   llh_cat_idx;
        struct obd_uuid         llh_tgtuuid;
        __u32                   llh_reserved[LLOG_HEADER_SIZE/sizeof(__u32)-23];
        /* These fields must always be at the end of the llog_log_hdr.
         * Note: llh_bitmap size is variable because llog chunk size could be
         * bigger than LLOG_MIN_CHUNK_SIZE, i.e. sizeof(llog_log_hdr) > 8192
         * bytes, and the real size is stored in llh_hdr.lrh_len, which means
         * llh_tail should only be refered by LLOG_HDR_TAIL().
         * But this structure is also used by client/server llog interface
         * (see llog_client.c), it will be kept in its original way to avoid
         * compatiblity issue. */
        __u32                   llh_bitmap[LLOG_BITMAP_BYTES / sizeof(__u32)];
        struct llog_rec_tail    llh_tail;
} __attribute__((packed));
#undef LLOG_HEADER_SIZE
#undef LLOG_BITMAP_BYTES

#define LLOG_HDR_BITMAP_SIZE(llh)       (__u32)((llh->llh_hdr.lrh_len - \
                                         llh->llh_bitmap_offset -       \
                                         sizeof(llh->llh_tail)) * 8)
#define LLOG_HDR_BITMAP(llh)    (__u32 *)((char *)(llh) +               \
                                          (llh)->llh_bitmap_offset)
#define LLOG_HDR_TAIL(llh)      ((struct llog_rec_tail *)((char *)llh + \
                                                 llh->llh_hdr.lrh_len - \
                                                 sizeof(llh->llh_tail)))

/** log cookies are used to reference a specific log file and a record therein */
struct llog_cookie {
        struct llog_logid       lgc_lgl;
        __u32                   lgc_subsys;
        __u32                   lgc_index;
        __u32                   lgc_padding;
} __attribute__((packed));

/** llog protocol */
enum llogd_rpc_ops {
        LLOG_ORIGIN_HANDLE_CREATE       = 501,
        LLOG_ORIGIN_HANDLE_NEXT_BLOCK   = 502,
        LLOG_ORIGIN_HANDLE_READ_HEADER  = 503,
        LLOG_ORIGIN_HANDLE_WRITE_REC    = 504,
        LLOG_ORIGIN_HANDLE_CLOSE        = 505,
        LLOG_ORIGIN_CONNECT             = 506,
        LLOG_CATINFO                    = 507,  /* deprecated */
        LLOG_ORIGIN_HANDLE_PREV_BLOCK   = 508,
        LLOG_ORIGIN_HANDLE_DESTROY      = 509,  /* for destroy llog object*/
        LLOG_LAST_OPC,
        LLOG_FIRST_OPC                  = LLOG_ORIGIN_HANDLE_CREATE
};

struct llogd_body {
        struct llog_logid  lgd_logid;
        __u32 lgd_ctxt_idx;
        __u32 lgd_llh_flags;
        __u32 lgd_index;
        __u32 lgd_saved_index;
        __u32 lgd_len;
        __u64 lgd_cur_offset;
} __attribute__((packed));

struct llogd_conn_body {
        struct llog_gen         lgdc_gen;
        struct llog_logid       lgdc_logid;
        __u32                   lgdc_ctxt_idx;
} __attribute__((packed));

/* Note: 64-bit types are 64-bit aligned in structure */
struct obdo {
        __u64                   o_valid;        /* hot fields in this obdo */
        struct ost_id           o_oi;
        __u64                   o_parent_seq;
        __u64                   o_size;         /* o_size-o_blocks == ost_lvb */
        __s64                   o_mtime;
        __s64                   o_atime;
        __s64                   o_ctime;
        __u64                   o_blocks;       /* brw: cli sent cached bytes */
        __u64                   o_grant;

        /* 32-bit fields start here: keep an even number of them via padding */
        __u32                   o_blksize;      /* optimal IO blocksize */
        __u32                   o_mode;         /* brw: cli sent cache remain */
        __u32                   o_uid;
        __u32                   o_gid;
        __u32                   o_flags;
        __u32                   o_nlink;        /* brw: checksum */
        __u32                   o_parent_oid;
        __u32                   o_misc;         /* brw: o_dropped */

        __u64                   o_ioepoch;      /* epoch in ost writes */
        __u32                   o_stripe_idx;   /* holds stripe idx */
        __u32                   o_parent_ver;
        struct lustre_handle    o_handle;       /* brw: lock handle to prolong
                                                 * locks */
        /* Originally, the field is llog_cookie for destroy with unlink cookie
         * from MDS, it is obsolete in 2.8. Then reuse it by client to transfer
         * layout and PFL information in IO, setattr RPCs. Since llog_cookie is
         * not used on wire any longer, remove it from the obdo, then it can be
         * enlarged freely in the further without affect related RPCs.
         *
         * sizeof(ost_layout) + sieof(__u32) == sizeof(llog_cookie). */
        struct ost_layout       o_layout;
        __u32                   o_padding_3;
        __u32                   o_uid_h;
        __u32                   o_gid_h;

        __u64                   o_data_version; /* getattr: sum of iversion for
                                                 * each stripe.
                                                 * brw: grant space consumed on
                                                 * the client for the write */
        __u64                   o_padding_4;
        __u64                   o_padding_5;
        __u64                   o_padding_6;
};

#define o_dirty   o_blocks
#define o_undirty o_mode
#define o_dropped o_misc
#define o_cksum   o_nlink
#define o_grant_used o_data_version

struct lfsck_request {
        __u32           lr_event;
        __u32           lr_index;
        __u32           lr_flags;
        __u32           lr_valid;
        union {
                __u32   lr_speed;
                __u32   lr_status;
        };
        __u16           lr_version;
        __u16           lr_active;
        __u16           lr_param;
        __u16           lr_async_windows;
        __u32           lr_flags2;
        struct lu_fid   lr_fid;
        struct lu_fid   lr_fid2;
        __u32           lr_comp_id;
        __u32           lr_padding_0;
        __u64           lr_padding_1;
        __u64           lr_padding_2;
        __u64           lr_padding_3;
};

struct lfsck_reply {
        __u32           lr_status;
        __u32           lr_padding_1;
        __u64           lr_repaired;
};

enum lfsck_events {
        LE_LASTID_REBUILDING    = 1,
        LE_LASTID_REBUILT       = 2,
        LE_PHASE1_DONE          = 3,
        LE_PHASE2_DONE          = 4,
        LE_START                = 5,
        LE_STOP                 = 6,
        LE_QUERY                = 7,
        /* LE_FID_ACCESSED      = 8, moved to lfsck_events_local */
        LE_PEER_EXIT            = 9,
        LE_CONDITIONAL_DESTROY  = 10,
        LE_PAIRS_VERIFY         = 11,
        LE_SET_LMV_MASTER       = 15,
        LE_SET_LMV_SLAVE        = 16,
};

enum lfsck_event_flags {
        LEF_TO_OST              = 0x00000001,
        LEF_FROM_OST            = 0x00000002,
        LEF_SET_LMV_HASH        = 0x00000004,
        LEF_SET_LMV_ALL         = 0x00000008,
        LEF_RECHECK_NAME_HASH   = 0x00000010,
        LEF_QUERY_ALL           = 0x00000020,
};

/* request structure for OST's */
struct ost_body {
        struct obdo oa;
};

/* Key for FIEMAP to be used in get_info calls */
struct ll_fiemap_info_key {
        char            lfik_name[8];
        struct obdo     lfik_oa;
        struct fiemap   lfik_fiemap;
};

#define IDX_INFO_MAGIC 0x3D37CC37

/* Index file transfer through the network. The server serializes the index into
 * a byte stream which is sent to the client via a bulk transfer */
struct idx_info {
        __u32           ii_magic;

        /* reply: see idx_info_flags below */
        __u32           ii_flags;

        /* request & reply: number of lu_idxpage (to be) transferred */
        __u16           ii_count;
        __u16           ii_pad0;

        /* request: requested attributes passed down to the iterator API */
        __u32           ii_attrs;

        /* request & reply: index file identifier (FID) */
        struct lu_fid   ii_fid;

        /* reply: version of the index file before starting to walk the index.
         * Please note that the version can be modified at any time during the
         * transfer */
        __u64           ii_version;

        /* request: hash to start with:
         * reply: hash of the first entry of the first lu_idxpage and hash
         *        of the entry to read next if any */
        __u64           ii_hash_start;
        __u64           ii_hash_end;

        /* reply: size of keys in lu_idxpages, minimal one if II_FL_VARKEY is
         * set */
        __u16           ii_keysize;

        /* reply: size of records in lu_idxpages, minimal one if II_FL_VARREC
         * is set */
        __u16           ii_recsize;

        __u32           ii_pad1;
        __u64           ii_pad2;
        __u64           ii_pad3;
};

#define II_END_OFF      MDS_DIR_END_OFF /* all entries have been read */

/* List of flags used in idx_info::ii_flags */
enum idx_info_flags {
        II_FL_NOHASH    = 1 << 0, /* client doesn't care about hash value */
        II_FL_VARKEY    = 1 << 1, /* keys can be of variable size */
        II_FL_VARREC    = 1 << 2, /* records can be of variable size */
        II_FL_NONUNQ    = 1 << 3, /* index supports non-unique keys */
        II_FL_NOKEY     = 1 << 4, /* client doesn't care about key */
};

#define LIP_MAGIC 0x8A6D6B6C

/* 4KB (= LU_PAGE_SIZE) container gathering key/record pairs */
struct lu_idxpage {
        /* 16-byte header */
        __u32   lip_magic;
        __u16   lip_flags;
        __u16   lip_nr;   /* number of entries in the container */
        __u64   lip_pad0; /* additional padding for future use */

        /* key/record pairs are stored in the remaining 4080 bytes.
         * depending upon the flags in idx_info::ii_flags, each key/record
         * pair might be preceded by:
         * - a hash value
         * - the key size (II_FL_VARKEY is set)
         * - the record size (II_FL_VARREC is set)
         *
         * For the time being, we only support fixed-size key & record. */
        char    lip_entries[0];
};

#define LIP_HDR_SIZE (offsetof(struct lu_idxpage, lip_entries))

/* Gather all possible type associated with a 4KB container */
union lu_page {
        struct lu_dirpage       lp_dir; /* for MDS_READPAGE */
        struct lu_idxpage       lp_idx; /* for OBD_IDX_READ */
        char                    lp_array[LU_PAGE_SIZE];
};

/* security opcodes */
typedef enum {
        SEC_CTX_INIT            = 801,
        SEC_CTX_INIT_CONT       = 802,
        SEC_CTX_FINI            = 803,
        SEC_LAST_OPC,
        SEC_FIRST_OPC           = SEC_CTX_INIT
} sec_cmd_t;

/*
 * capa related definitions
 */
#define CAPA_HMAC_MAX_LEN       64
#define CAPA_HMAC_KEY_MAX_LEN   56

/* NB take care when changing the sequence of elements this struct,
 * because the offset info is used in find_capa() */
struct lustre_capa {
        struct lu_fid   lc_fid;         /** fid */
        __u64           lc_opc;         /** operations allowed */
        __u64           lc_uid;         /** file owner */
        __u64           lc_gid;         /** file group */
        __u32           lc_flags;       /** HMAC algorithm & flags */
        __u32           lc_keyid;       /** key# used for the capability */
        __u32           lc_timeout;     /** capa timeout value (sec) */
        __u32           lc_expiry;      /** expiry time (sec) */
        __u8            lc_hmac[CAPA_HMAC_MAX_LEN];   /** HMAC */
} __attribute__((packed));

/** lustre_capa::lc_opc */
enum {
        CAPA_OPC_BODY_WRITE   = 1<<0,  /**< write object data */
        CAPA_OPC_BODY_READ    = 1<<1,  /**< read object data */
        CAPA_OPC_INDEX_LOOKUP = 1<<2,  /**< lookup object fid */
        CAPA_OPC_INDEX_INSERT = 1<<3,  /**< insert object fid */
        CAPA_OPC_INDEX_DELETE = 1<<4,  /**< delete object fid */
        CAPA_OPC_OSS_WRITE    = 1<<5,  /**< write oss object data */
        CAPA_OPC_OSS_READ     = 1<<6,  /**< read oss object data */
        CAPA_OPC_OSS_TRUNC    = 1<<7,  /**< truncate oss object */
        CAPA_OPC_OSS_DESTROY  = 1<<8,  /**< destroy oss object */
        CAPA_OPC_META_WRITE   = 1<<9,  /**< write object meta data */
        CAPA_OPC_META_READ    = 1<<10, /**< read object meta data */
};

#define CAPA_OPC_OSS_RW (CAPA_OPC_OSS_READ | CAPA_OPC_OSS_WRITE)
#define CAPA_OPC_MDS_ONLY                                                   \
        (CAPA_OPC_BODY_WRITE | CAPA_OPC_BODY_READ | CAPA_OPC_INDEX_LOOKUP | \
         CAPA_OPC_INDEX_INSERT | CAPA_OPC_INDEX_DELETE)
#define CAPA_OPC_OSS_ONLY                                                   \
        (CAPA_OPC_OSS_WRITE | CAPA_OPC_OSS_READ | CAPA_OPC_OSS_TRUNC |      \
         CAPA_OPC_OSS_DESTROY)
#define CAPA_OPC_MDS_DEFAULT ~CAPA_OPC_OSS_ONLY
#define CAPA_OPC_OSS_DEFAULT ~(CAPA_OPC_MDS_ONLY | CAPA_OPC_OSS_ONLY)

/* lustre_capa::lc_hmac_alg */
enum {
        CAPA_HMAC_ALG_SHA1 = 1, /**< sha1 algorithm */
        CAPA_HMAC_ALG_MAX,
};

#define CAPA_FL_MASK            0x00ffffff
#define CAPA_HMAC_ALG_MASK      0xff000000

struct lustre_capa_key {
        __u64   lk_seq;       /**< mds# */
        __u32   lk_keyid;     /**< key# */
        __u32   lk_padding;
        __u8    lk_key[CAPA_HMAC_KEY_MAX_LEN];    /**< key */
} __attribute__((packed));

/** The link ea holds 1 \a link_ea_entry for each hardlink */
#define LINK_EA_MAGIC 0x11EAF1DFUL
struct link_ea_header {
        __u32 leh_magic;
        __u32 leh_reccount;
        __u64 leh_len;  /* total size */
        __u32 leh_overflow_time;
        __u32 leh_padding;
};

/** Hardlink data is name and parent fid.
 * Stored in this crazy struct for maximum packing and endian-neutrality
 */
struct link_ea_entry {
        /** __u16 stored big-endian, unaligned */
        unsigned char      lee_reclen[2];
        unsigned char      lee_parent_fid[sizeof(struct lu_fid)];
        char               lee_name[0];
}__attribute__((packed));

/** fid2path request/reply structure */
struct getinfo_fid2path {
        struct lu_fid   gf_fid;
        __u64           gf_recno;
        __u32           gf_linkno;
        __u32           gf_pathlen;
        union {
                char            gf_path[0];
                struct lu_fid   gf_root_fid[0];
        } gf_u;
} __attribute__((packed));

/** path2parent request/reply structures */
struct getparent {
        struct lu_fid   gp_fid;         /**< parent FID */
        __u32           gp_linkno;      /**< hardlink number */
        __u32           gp_name_size;   /**< size of the name field */
        char            gp_name[0];     /**< zero-terminated link name */
} __attribute__((packed));

enum {
        LAYOUT_INTENT_ACCESS    = 0,    /** generic access */
        LAYOUT_INTENT_READ      = 1,    /** not used */
        LAYOUT_INTENT_WRITE     = 2,    /** write file, for comp layout */
        LAYOUT_INTENT_GLIMPSE   = 3,    /** not used */
        LAYOUT_INTENT_TRUNC     = 4,    /** truncate file, for comp layout */
        LAYOUT_INTENT_RELEASE   = 5,    /** reserved for HSM release */
        LAYOUT_INTENT_RESTORE   = 6,    /** reserved for HSM restore */
};

/* enqueue layout lock with intent */
struct layout_intent {
        __u32 li_opc;   /* intent operation for enqueue, read, write etc */
        __u32 li_flags;
        __u64 li_start;
        __u64 li_end;
} __attribute__((packed));

/**
 * On the wire version of hsm_progress structure.
 *
 * Contains the userspace hsm_progress and some internal fields.
 */
struct hsm_progress_kernel {
        /* Field taken from struct hsm_progress */
        lustre_fid              hpk_fid;
        __u64                   hpk_cookie;
        struct hsm_extent       hpk_extent;
        __u16                   hpk_flags;
        __u16                   hpk_errval; /* positive val */
        __u32                   hpk_padding1;
        /* Additional fields */
        __u64                   hpk_data_version;
        __u64                   hpk_padding2;
} __attribute__((packed));

/**
 * OUT_UPDATE RPC Format
 *
 * During the cross-ref operation, the Master MDT, which the client send the
 * request to, will disassembly the operation into object updates, then OSP
 * will send these updates to the remote MDT to be executed.
 *
 * An UPDATE_OBJ RPC does a list of updates.  Each update belongs to an
 * operation and does a type of modification to an object.
 *
 * Request Format
 *
 *   update_buf
 *   update (1st)
 *   update (2nd)
 *   ...
 *   update (ub_count-th)
 *
 * ub_count must be less than or equal to UPDATE_PER_RPC_MAX.
 *
 * Reply Format
 *
 *   update_reply
 *   rc [+ buffers] (1st)
 *   rc [+ buffers] (2st)
 *   ...
 *   rc [+ buffers] (nr_count-th)
 *
 * ur_count must be less than or equal to UPDATE_PER_RPC_MAX and should usually
 * be equal to ub_count.
 */

/**
 * Type of each update, if adding/deleting update, please also update
 * update_opcode in lustre/target/out_lib.c.
 */
enum update_type {
        OUT_START               = 0,
        OUT_CREATE              = 1,
        OUT_DESTROY             = 2,
        OUT_REF_ADD             = 3,
        OUT_REF_DEL             = 4,
        OUT_ATTR_SET            = 5,
        OUT_ATTR_GET            = 6,
        OUT_XATTR_SET           = 7,
        OUT_XATTR_GET           = 8,
        OUT_INDEX_LOOKUP        = 9,
        OUT_INDEX_INSERT        = 10,
        OUT_INDEX_DELETE        = 11,
        OUT_WRITE               = 12,
        OUT_XATTR_DEL           = 13,
        OUT_PUNCH               = 14,
        OUT_READ                = 15,
        OUT_NOOP                = 16,
        OUT_LAST
};

enum update_flag {
        UPDATE_FL_OST           = 0x00000001,   /* op from OST (not MDT) */
        UPDATE_FL_SYNC          = 0x00000002,   /* commit before replying */
        UPDATE_FL_COMMITTED     = 0x00000004,   /* op committed globally */
        UPDATE_FL_NOLOG         = 0x00000008    /* for idempotent updates */
};

struct object_update_param {
        __u16   oup_len;        /* length of this parameter */
        __u16   oup_padding;
        __u32   oup_padding2;
        char    oup_buf[0];
};

/* object update */
struct object_update {
        __u16           ou_type;                /* enum update_type */
        __u16           ou_params_count;        /* update parameters count */
        __u32           ou_result_size;         /* how many bytes can return */
        __u32           ou_flags;               /* enum update_flag */
        __u32           ou_padding1;            /* padding 1 */
        __u64           ou_batchid;             /* op transno on master */
        struct lu_fid   ou_fid;                 /* object to be updated */
        struct object_update_param ou_params[0]; /* update params */
};

#define UPDATE_REQUEST_MAGIC_V1 0xBDDE0001
#define UPDATE_REQUEST_MAGIC_V2 0xBDDE0002
#define UPDATE_REQUEST_MAGIC    UPDATE_REQUEST_MAGIC_V2
/* Hold object_updates sending to the remote OUT in single RPC */
struct object_update_request {
        __u32                   ourq_magic;
        __u16                   ourq_count;     /* number of ourq_updates[] */
        __u16                   ourq_padding;
        struct object_update    ourq_updates[0];
};

#define OUT_UPDATE_HEADER_MAGIC         0xBDDF0001
#define OUT_UPDATE_MAX_INLINE_SIZE      4096
/* Header for updates request between MDTs */
struct out_update_header {
        __u32           ouh_magic;
        __u32           ouh_count;
        __u32           ouh_inline_length;
        __u32           ouh_reply_size;
        __u32           ouh_inline_data[0];
};

struct out_update_buffer {
        __u32   oub_size;
        __u32   oub_padding;
};

/* the result of object update */
struct object_update_result {
        __u32   our_rc;
        __u16   our_datalen;
        __u16   our_padding;
        __u32   our_data[0];
};

#define UPDATE_REPLY_MAGIC_V1   0x00BD0001
#define UPDATE_REPLY_MAGIC_V2   0x00BD0002
#define UPDATE_REPLY_MAGIC      UPDATE_REPLY_MAGIC_V2
/* Hold object_update_results being replied from the remote OUT. */
struct object_update_reply {
        __u32   ourp_magic;
        __u16   ourp_count;
        __u16   ourp_padding;
        __u16   ourp_lens[0];
};

/* read update result */
struct out_read_reply {
        __u32   orr_size;
        __u32   orr_padding;
        __u64   orr_offset;
        char    orr_data[0];
};

/** layout swap request structure
 * fid1 and fid2 are in mdt_body
 */
struct mdc_swap_layouts {
        __u64           msl_flags;
} __attribute__((packed));

struct close_data {
        struct lustre_handle    cd_handle;
        struct lu_fid           cd_fid;
        __u64                   cd_data_version;
        __u64                   cd_reserved[8];
};

/* Update llog format */
struct update_op {
        struct lu_fid   uop_fid;
        __u16           uop_type;
        __u16           uop_param_count;
        __u16           uop_params_off[0];
};

struct update_ops {
        struct update_op        uops_op[0];
};

struct update_params {
        struct object_update_param      up_params[0];
};

enum update_records_flag {
        UPDATE_RECORD_CONTINUE = 1 >> 0,
};
/*
 * This is the update record format used to store the updates in
 * disk. All updates of the operation will be stored in ur_ops.
 * All of parameters for updates of the operation will be stored
 * in ur_params.
 * To save the space of the record, parameters in ur_ops will only
 * remember their offset in ur_params, so to avoid storing duplicate
 * parameters in ur_params, which can help us save a lot space for
 * operation like creating striped directory.
 */
struct update_records {
        __u64                   ur_master_transno;
        __u64                   ur_batchid;
        __u32                   ur_flags;
        /* If the operation includes multiple updates, then ur_index
         * means the index of the update inside the whole updates. */
        __u32                   ur_index;
        __u32                   ur_update_count;
        __u32                   ur_param_count;
        struct update_ops       ur_ops;
         /* Note ur_ops has a variable size, so comment out
          * the following ur_params, in case some use it directly
          * update_records->ur_params
          *
          * struct update_params        ur_params;
          */
};

struct llog_update_record {
        struct llog_rec_hdr     lur_hdr;
        struct update_records   lur_update_rec;
        /* Note ur_update_rec has a variable size, so comment out
        * the following ur_tail, in case someone use it directly
        *
        * struct llog_rec_tail lur_tail;
        */
};

/* nodemap records, uses 32 byte record length */
#define LUSTRE_NODEMAP_NAME_LENGTH 16
struct nodemap_cluster_rec {
        char    ncr_name[LUSTRE_NODEMAP_NAME_LENGTH + 1];
        __u8    ncr_flags;
        __u16   ncr_padding1;
        __u32   ncr_padding2;
        __u32   ncr_squash_uid;
        __u32   ncr_squash_gid;
};

/* lnet_nid_t is 8 bytes */
struct nodemap_range_rec {
        lnet_nid_t      nrr_start_nid;
        lnet_nid_t      nrr_end_nid;
        __u64           nrr_padding1;
        __u64           nrr_padding2;
};

struct nodemap_id_rec {
        __u32   nir_id_fs;
        __u32   nir_padding1;
        __u64   nir_padding2;
        __u64   nir_padding3;
        __u64   nir_padding4;
};

struct nodemap_global_rec {
        __u8    ngr_is_active;
        __u8    ngr_padding1;
        __u16   ngr_padding2;
        __u32   ngr_padding3;
        __u64   ngr_padding4;
        __u64   ngr_padding5;
        __u64   ngr_padding6;
};

union nodemap_rec {
        struct nodemap_cluster_rec ncr;
        struct nodemap_range_rec nrr;
        struct nodemap_id_rec nir;
        struct nodemap_global_rec ngr;
};

/* This is the lu_ladvise struct which goes out on the wire.
 * Corresponds to the userspace arg llapi_lu_ladvise.
 * value[1-4] are unspecified fields, used differently by different advices */
struct lu_ladvise {
        __u16 lla_advice;       /* advice type */
        __u16 lla_value1;       /* values for different advice types */
        __u32 lla_value2;
        __u64 lla_start;        /* first byte of extent for advice */
        __u64 lla_end;          /* last byte of extent for advice */
        __u32 lla_value3;
        __u32 lla_value4;
};

/* This is the ladvise_hdr which goes on the wire, corresponds to the userspace
 * arg llapi_ladvise_hdr.
 * value[1-3] are unspecified fields, used differently by different advices */
struct ladvise_hdr {
        __u32                   lah_magic;      /* LADVISE_MAGIC */
        __u32                   lah_count;      /* number of advices */
        __u64                   lah_flags;      /* from enum ladvise_flag */
        __u32                   lah_value1;     /* unused */
        __u32                   lah_value2;     /* unused */
        __u64                   lah_value3;     /* unused */
        struct lu_ladvise       lah_advise[0];  /* advices in this header */
};

#endif
/** @} lustreidl */