/*
 *  Server-side types for NFSv4.
 *
 *  Copyright (c) 2002 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  Kendrick Smith <kmsmith@umich.edu>
 *  Andy Adamson   <andros@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef _LINUX_NFSD_XDR4_H
#define _LINUX_NFSD_XDR4_H

#include "state.h"
#include "nfsd.h"

#define NFSD4_MAX_TAGLEN        128
#define XDR_LEN(n)                     (((n) + 3) & ~3)

#define CURRENT_STATE_ID_FLAG (1<<0)
#define SAVED_STATE_ID_FLAG (1<<1)

#define SET_CSTATE_FLAG(c, f) ((c)->sid_flags |= (f))
#define HAS_CSTATE_FLAG(c, f) ((c)->sid_flags & (f))
#define CLEAR_CSTATE_FLAG(c, f) ((c)->sid_flags &= ~(f))

struct nfsd4_compound_state {
        struct svc_fh           current_fh;
        struct svc_fh           save_fh;
        struct nfs4_stateowner  *replay_owner;
        struct nfs4_client      *clp;
        /* For sessions DRC */
        struct nfsd4_session    *session;
        struct nfsd4_slot       *slot;
        int                     data_offset;
        bool                    spo_must_allowed;
        size_t                  iovlen;
        u32                     minorversion;
        __be32                  status;
        stateid_t       current_stateid;
        stateid_t       save_stateid;
        /* to indicate current and saved state id presents */
        u32             sid_flags;
};

static inline bool nfsd4_has_session(struct nfsd4_compound_state *cs)
{
        return cs->slot != NULL;
}

struct nfsd4_change_info {
        u32             atomic;
        u64             before_change;
        u64             after_change;
};

struct nfsd4_access {
        u32             ac_req_access;      /* request */
        u32             ac_supported;       /* response */
        u32             ac_resp_access;     /* response */
};

struct nfsd4_close {
        u32             cl_seqid;           /* request */
        stateid_t       cl_stateid;         /* request+response */
};

struct nfsd4_commit {
        u64             co_offset;          /* request */
        u32             co_count;           /* request */
        nfs4_verifier   co_verf;            /* response */
};

struct nfsd4_create {
        u32             cr_namelen;         /* request */
        char *          cr_name;            /* request */
        u32             cr_type;            /* request */
        union {                             /* request */
                struct {
                        u32 datalen;
                        char *data;
                        struct kvec first;
                } link;   /* NF4LNK */
                struct {
                        u32 specdata1;
                        u32 specdata2;
                } dev;    /* NF4BLK, NF4CHR */
        } u;
        u32             cr_bmval[3];        /* request */
        struct iattr    cr_iattr;           /* request */
        int             cr_umask;           /* request */
        struct nfsd4_change_info  cr_cinfo; /* response */
        struct nfs4_acl *cr_acl;
        struct xdr_netobj cr_label;
};
#define cr_datalen      u.link.datalen
#define cr_data         u.link.data
#define cr_first        u.link.first
#define cr_specdata1    u.dev.specdata1
#define cr_specdata2    u.dev.specdata2

struct nfsd4_delegreturn {
        stateid_t       dr_stateid;
};

struct nfsd4_getattr {
        u32             ga_bmval[3];        /* request */
        struct svc_fh   *ga_fhp;            /* response */
};

struct nfsd4_link {
        u32             li_namelen;         /* request */
        char *          li_name;            /* request */
        struct nfsd4_change_info  li_cinfo; /* response */
};

struct nfsd4_lock_denied {
        clientid_t      ld_clientid;
        struct xdr_netobj       ld_owner;
        u64             ld_start;
        u64             ld_length;
        u32             ld_type;
};

struct nfsd4_lock {
        /* request */
        u32             lk_type;
        u32             lk_reclaim;         /* boolean */
        u64             lk_offset;
        u64             lk_length;
        u32             lk_is_new;
        union {
                struct {
                        u32             open_seqid;
                        stateid_t       open_stateid;
                        u32             lock_seqid;
                        clientid_t      clientid;
                        struct xdr_netobj owner;
                } new;
                struct {
                        stateid_t       lock_stateid;
                        u32             lock_seqid;
                } old;
        } v;

        /* response */
        union {
                struct {
                        stateid_t               stateid;
                } ok;
                struct nfsd4_lock_denied        denied;
        } u;
};
#define lk_new_open_seqid       v.new.open_seqid
#define lk_new_open_stateid     v.new.open_stateid
#define lk_new_lock_seqid       v.new.lock_seqid
#define lk_new_clientid         v.new.clientid
#define lk_new_owner            v.new.owner
#define lk_old_lock_stateid     v.old.lock_stateid
#define lk_old_lock_seqid       v.old.lock_seqid

#define lk_resp_stateid u.ok.stateid
#define lk_denied       u.denied


struct nfsd4_lockt {
        u32                             lt_type;
        clientid_t                      lt_clientid;
        struct xdr_netobj               lt_owner;
        u64                             lt_offset;
        u64                             lt_length;
        struct nfsd4_lock_denied        lt_denied;
};

 
struct nfsd4_locku {
        u32             lu_type;
        u32             lu_seqid;
        stateid_t       lu_stateid;
        u64             lu_offset;
        u64             lu_length;
};


struct nfsd4_lookup {
        u32             lo_len;             /* request */
        char *          lo_name;            /* request */
};

struct nfsd4_putfh {
        u32             pf_fhlen;           /* request */
        char            *pf_fhval;          /* request */
        bool            no_verify;          /* represents foreigh fh */
};

struct nfsd4_getxattr {
        char            *getxa_name;            /* request */
        u32             getxa_len;              /* request */
        void            *getxa_buf;
};

struct nfsd4_setxattr {
        u32             setxa_flags;            /* request */
        char            *setxa_name;            /* request */
        char            *setxa_buf;             /* request */
        u32             setxa_len;              /* request */
        struct nfsd4_change_info  setxa_cinfo;  /* response */
};

struct nfsd4_removexattr {
        char            *rmxa_name;             /* request */
        struct nfsd4_change_info  rmxa_cinfo;   /* response */
};

struct nfsd4_listxattrs {
        u64             lsxa_cookie;            /* request */
        u32             lsxa_maxcount;          /* request */
        char            *lsxa_buf;              /* unfiltered buffer (reply) */
        u32             lsxa_len;               /* unfiltered len (reply) */
};

struct nfsd4_open {
        u32             op_claim_type;      /* request */
        u32             op_fnamelen;
        char *          op_fname;           /* request - everything but CLAIM_PREV */
        u32             op_delegate_type;   /* request - CLAIM_PREV only */
        stateid_t       op_delegate_stateid; /* request - response */
        u32             op_why_no_deleg;    /* response - DELEG_NONE_EXT only */
        u32             op_create;          /* request */
        u32             op_createmode;      /* request */
        int             op_umask;           /* request */
        u32             op_bmval[3];        /* request */
        struct iattr    op_iattr;           /* UNCHECKED4, GUARDED4, EXCLUSIVE4_1 */
        nfs4_verifier   op_verf __attribute__((aligned(32)));
                                            /* EXCLUSIVE4 */
        clientid_t      op_clientid;        /* request */
        struct xdr_netobj op_owner;           /* request */
        u32             op_seqid;           /* request */
        u32             op_share_access;    /* request */
        u32             op_share_deny;      /* request */
        u32             op_deleg_want;      /* request */
        stateid_t       op_stateid;         /* response */
        __be32          op_xdr_error;       /* see nfsd4_open_omfg() */
        u32             op_recall;          /* recall */
        struct nfsd4_change_info  op_cinfo; /* response */
        u32             op_rflags;          /* response */
        bool            op_truncate;        /* used during processing */
        bool            op_created;         /* used during processing */
        struct nfs4_openowner *op_openowner; /* used during processing */
        struct nfs4_file *op_file;          /* used during processing */
        struct nfs4_ol_stateid *op_stp;     /* used during processing */
        struct nfs4_clnt_odstate *op_odstate; /* used during processing */
        struct nfs4_acl *op_acl;
        struct xdr_netobj op_label;
};

struct nfsd4_open_confirm {
        stateid_t       oc_req_stateid          /* request */;
        u32             oc_seqid                /* request */;
        stateid_t       oc_resp_stateid         /* response */;
};

struct nfsd4_open_downgrade {
        stateid_t       od_stateid;
        u32             od_seqid;
        u32             od_share_access;        /* request */
        u32             od_deleg_want;          /* request */
        u32             od_share_deny;          /* request */
};


struct nfsd4_read {
        stateid_t               rd_stateid;         /* request */
        u64                     rd_offset;          /* request */
        u32                     rd_length;          /* request */
        int                     rd_vlen;
        struct nfsd_file        *rd_nf;
        
        struct svc_rqst         *rd_rqstp;          /* response */
        struct svc_fh           *rd_fhp;             /* response */
};

struct nfsd4_readdir {
        u64             rd_cookie;          /* request */
        nfs4_verifier   rd_verf;            /* request */
        u32             rd_dircount;        /* request */
        u32             rd_maxcount;        /* request */
        u32             rd_bmval[3];        /* request */
        struct svc_rqst *rd_rqstp;          /* response */
        struct svc_fh * rd_fhp;             /* response */

        struct readdir_cd       common;
        struct xdr_stream       *xdr;
        int                     cookie_offset;
};

struct nfsd4_release_lockowner {
        clientid_t        rl_clientid;
        struct xdr_netobj rl_owner;
};
struct nfsd4_readlink {
        struct svc_rqst *rl_rqstp;          /* request */
        struct svc_fh * rl_fhp;             /* request */
};

struct nfsd4_remove {
        u32             rm_namelen;         /* request */
        char *          rm_name;            /* request */
        struct nfsd4_change_info  rm_cinfo; /* response */
};

struct nfsd4_rename {
        u32             rn_snamelen;        /* request */
        char *          rn_sname;           /* request */
        u32             rn_tnamelen;        /* request */
        char *          rn_tname;           /* request */
        struct nfsd4_change_info  rn_sinfo; /* response */
        struct nfsd4_change_info  rn_tinfo; /* response */
};

struct nfsd4_secinfo {
        u32 si_namelen;                                 /* request */
        char *si_name;                                  /* request */
        struct svc_export *si_exp;                      /* response */
};

struct nfsd4_secinfo_no_name {
        u32 sin_style;                                  /* request */
        struct svc_export *sin_exp;                     /* response */
};

struct nfsd4_setattr {
        stateid_t       sa_stateid;         /* request */
        u32             sa_bmval[3];        /* request */
        struct iattr    sa_iattr;           /* request */
        struct nfs4_acl *sa_acl;
        struct xdr_netobj sa_label;
};

struct nfsd4_setclientid {
        nfs4_verifier   se_verf;            /* request */
        struct xdr_netobj se_name;
        u32             se_callback_prog;   /* request */
        u32             se_callback_netid_len;  /* request */
        char *          se_callback_netid_val;  /* request */
        u32             se_callback_addr_len;   /* request */
        char *          se_callback_addr_val;   /* request */
        u32             se_callback_ident;  /* request */
        clientid_t      se_clientid;        /* response */
        nfs4_verifier   se_confirm;         /* response */
};

struct nfsd4_setclientid_confirm {
        clientid_t      sc_clientid;
        nfs4_verifier   sc_confirm;
};

struct nfsd4_test_stateid_id {
        __be32                  ts_id_status;
        stateid_t               ts_id_stateid;
        struct list_head        ts_id_list;
};

struct nfsd4_test_stateid {
        u32             ts_num_ids;
        struct list_head ts_stateid_list;
};

struct nfsd4_free_stateid {
        stateid_t       fr_stateid;         /* request */
};

/* also used for NVERIFY */
struct nfsd4_verify {
        u32             ve_bmval[3];        /* request */
        u32             ve_attrlen;         /* request */
        char *          ve_attrval;         /* request */
};

struct nfsd4_write {
        stateid_t       wr_stateid;         /* request */
        u64             wr_offset;          /* request */
        u32             wr_stable_how;      /* request */
        u32             wr_buflen;          /* request */
        struct xdr_buf  wr_payload;         /* request */

        u32             wr_bytes_written;   /* response */
        u32             wr_how_written;     /* response */
        nfs4_verifier   wr_verifier;        /* response */
};

struct nfsd4_exchange_id {
        nfs4_verifier   verifier;
        struct xdr_netobj clname;
        u32             flags;
        clientid_t      clientid;
        u32             seqid;
        u32             spa_how;
        u32             spo_must_enforce[3];
        u32             spo_must_allow[3];
        struct xdr_netobj nii_domain;
        struct xdr_netobj nii_name;
        struct timespec64 nii_time;
};

struct nfsd4_sequence {
        struct nfs4_sessionid   sessionid;              /* request/response */
        u32                     seqid;                  /* request/response */
        u32                     slotid;                 /* request/response */
        u32                     maxslots;               /* request/response */
        u32                     cachethis;              /* request */
#if 0
        u32                     target_maxslots;        /* response */
#endif /* not yet */
        u32                     status_flags;           /* response */
};

struct nfsd4_destroy_session {
        struct nfs4_sessionid   sessionid;
};

struct nfsd4_destroy_clientid {
        clientid_t clientid;
};

struct nfsd4_reclaim_complete {
        u32 rca_one_fs;
};

struct nfsd4_deviceid {
        u64                     fsid_idx;
        u32                     generation;
        u32                     pad;
};

struct nfsd4_layout_seg {
        u32                     iomode;
        u64                     offset;
        u64                     length;
};

struct nfsd4_getdeviceinfo {
        struct nfsd4_deviceid   gd_devid;       /* request */
        u32                     gd_layout_type; /* request */
        u32                     gd_maxcount;    /* request */
        u32                     gd_notify_types;/* request - response */
        void                    *gd_device;     /* response */
};

struct nfsd4_layoutget {
        u64                     lg_minlength;   /* request */
        u32                     lg_signal;      /* request */
        u32                     lg_layout_type; /* request */
        u32                     lg_maxcount;    /* request */
        stateid_t               lg_sid;         /* request/response */
        struct nfsd4_layout_seg lg_seg;         /* request/response */
        void                    *lg_content;    /* response */
};

struct nfsd4_layoutcommit {
        stateid_t               lc_sid;         /* request */
        struct nfsd4_layout_seg lc_seg;         /* request */
        u32                     lc_reclaim;     /* request */
        u32                     lc_newoffset;   /* request */
        u64                     lc_last_wr;     /* request */
        struct timespec64       lc_mtime;       /* request */
        u32                     lc_layout_type; /* request */
        u32                     lc_up_len;      /* layout length */
        void                    *lc_up_layout;  /* decoded by callback */
        u32                     lc_size_chg;    /* boolean for response */
        u64                     lc_newsize;     /* response */
};

struct nfsd4_layoutreturn {
        u32                     lr_return_type; /* request */
        u32                     lr_layout_type; /* request */
        struct nfsd4_layout_seg lr_seg;         /* request */
        u32                     lr_reclaim;     /* request */
        u32                     lrf_body_len;   /* request */
        void                    *lrf_body;      /* request */
        stateid_t               lr_sid;         /* request/response */
        u32                     lrs_present;    /* response */
};

struct nfsd4_fallocate {
        /* request */
        stateid_t       falloc_stateid;
        loff_t          falloc_offset;
        u64             falloc_length;
};

struct nfsd4_clone {
        /* request */
        stateid_t       cl_src_stateid;
        stateid_t       cl_dst_stateid;
        u64             cl_src_pos;
        u64             cl_dst_pos;
        u64             cl_count;
};

struct nfsd42_write_res {
        u64                     wr_bytes_written;
        u32                     wr_stable_how;
        nfs4_verifier           wr_verifier;
        stateid_t               cb_stateid;
};

struct nfsd4_copy {
        /* request */
        stateid_t               cp_src_stateid;
        stateid_t               cp_dst_stateid;
        u64                     cp_src_pos;
        u64                     cp_dst_pos;
        u64                     cp_count;
        struct nl4_server       cp_src;
        bool                    cp_intra;

        /* both */
        u32                     cp_synchronous;

        /* response */
        struct nfsd42_write_res cp_res;

        /* for cb_offload */
        struct nfsd4_callback   cp_cb;
        __be32                  nfserr;
        struct knfsd_fh         fh;

        struct nfs4_client      *cp_clp;

        struct nfsd_file        *nf_src;
        struct nfsd_file        *nf_dst;

        copy_stateid_t          cp_stateid;

        struct list_head        copies;
        struct task_struct      *copy_task;
        refcount_t              refcount;
        bool                    stopped;

        struct vfsmount         *ss_mnt;
        struct nfs_fh           c_fh;
        nfs4_stateid            stateid;
        bool                    committed;
};

struct nfsd4_seek {
        /* request */
        stateid_t       seek_stateid;
        loff_t          seek_offset;
        u32             seek_whence;

        /* response */
        u32             seek_eof;
        loff_t          seek_pos;
};

struct nfsd4_offload_status {
        /* request */
        stateid_t       stateid;

        /* response */
        u64             count;
        u32             status;
};

struct nfsd4_copy_notify {
        /* request */
        stateid_t               cpn_src_stateid;
        struct nl4_server       cpn_dst;

        /* response */
        stateid_t               cpn_cnr_stateid;
        u64                     cpn_sec;
        u32                     cpn_nsec;
        struct nl4_server       cpn_src;
};

struct nfsd4_op {
        u32                                     opnum;
        const struct nfsd4_operation *          opdesc;
        __be32                                  status;
        union nfsd4_op_u {
                struct nfsd4_access             access;
                struct nfsd4_close              close;
                struct nfsd4_commit             commit;
                struct nfsd4_create             create;
                struct nfsd4_delegreturn        delegreturn;
                struct nfsd4_getattr            getattr;
                struct svc_fh *                 getfh;
                struct nfsd4_link               link;
                struct nfsd4_lock               lock;
                struct nfsd4_lockt              lockt;
                struct nfsd4_locku              locku;
                struct nfsd4_lookup             lookup;
                struct nfsd4_verify             nverify;
                struct nfsd4_open               open;
                struct nfsd4_open_confirm       open_confirm;
                struct nfsd4_open_downgrade     open_downgrade;
                struct nfsd4_putfh              putfh;
                struct nfsd4_read               read;
                struct nfsd4_readdir            readdir;
                struct nfsd4_readlink           readlink;
                struct nfsd4_remove             remove;
                struct nfsd4_rename             rename;
                clientid_t                      renew;
                struct nfsd4_secinfo            secinfo;
                struct nfsd4_setattr            setattr;
                struct nfsd4_setclientid        setclientid;
                struct nfsd4_setclientid_confirm setclientid_confirm;
                struct nfsd4_verify             verify;
                struct nfsd4_write              write;
                struct nfsd4_release_lockowner  release_lockowner;

                /* NFSv4.1 */
                struct nfsd4_exchange_id        exchange_id;
                struct nfsd4_backchannel_ctl    backchannel_ctl;
                struct nfsd4_bind_conn_to_session bind_conn_to_session;
                struct nfsd4_create_session     create_session;
                struct nfsd4_destroy_session    destroy_session;
                struct nfsd4_destroy_clientid   destroy_clientid;
                struct nfsd4_sequence           sequence;
                struct nfsd4_reclaim_complete   reclaim_complete;
                struct nfsd4_test_stateid       test_stateid;
                struct nfsd4_free_stateid       free_stateid;
                struct nfsd4_getdeviceinfo      getdeviceinfo;
                struct nfsd4_layoutget          layoutget;
                struct nfsd4_layoutcommit       layoutcommit;
                struct nfsd4_layoutreturn       layoutreturn;
                struct nfsd4_secinfo_no_name    secinfo_no_name;

                /* NFSv4.2 */
                struct nfsd4_fallocate          allocate;
                struct nfsd4_fallocate          deallocate;
                struct nfsd4_clone              clone;
                struct nfsd4_copy               copy;
                struct nfsd4_offload_status     offload_status;
                struct nfsd4_copy_notify        copy_notify;
                struct nfsd4_seek               seek;

                struct nfsd4_getxattr           getxattr;
                struct nfsd4_setxattr           setxattr;
                struct nfsd4_listxattrs         listxattrs;
                struct nfsd4_removexattr        removexattr;
        } u;
        struct nfs4_replay *                    replay;
};

bool nfsd4_cache_this_op(struct nfsd4_op *);

/*
 * Memory needed just for the duration of processing one compound:
 */
struct svcxdr_tmpbuf {
        struct svcxdr_tmpbuf *next;
        char buf[];
};

struct nfsd4_compoundargs {
        /* scratch variables for XDR decode */
        struct xdr_stream               *xdr;
        struct svcxdr_tmpbuf            *to_free;
        struct svc_rqst                 *rqstp;

        u32                             taglen;
        char *                          tag;
        u32                             minorversion;
        u32                             opcnt;
        struct nfsd4_op                 *ops;
        struct nfsd4_op                 iops[8];
        int                             cachetype;
};

struct nfsd4_compoundres {
        /* scratch variables for XDR encode */
        struct xdr_stream               *xdr;
        struct svc_rqst *               rqstp;

        u32                             taglen;
        char *                          tag;
        u32                             opcnt;
        __be32 *                        tagp; /* tag, opcount encode location */
        struct nfsd4_compound_state     cstate;
};

static inline bool nfsd4_is_solo_sequence(struct nfsd4_compoundres *resp)
{
        struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
        return resp->opcnt == 1 && args->ops[0].opnum == OP_SEQUENCE;
}

/*
 * The session reply cache only needs to cache replies that the client
 * actually asked us to.  But it's almost free for us to cache compounds
 * consisting of only a SEQUENCE op, so we may as well cache those too.
 * Also, the protocol doesn't give us a convenient response in the case
 * of a replay of a solo SEQUENCE op that wasn't cached
 * (RETRY_UNCACHED_REP can only be returned in the second op of a
 * compound).
 */
static inline bool nfsd4_cache_this(struct nfsd4_compoundres *resp)
{
        return (resp->cstate.slot->sl_flags & NFSD4_SLOT_CACHETHIS)
                || nfsd4_is_solo_sequence(resp);
}

static inline bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
{
        struct nfsd4_compoundres *resp = rqstp->rq_resp;
        struct nfsd4_compoundargs *argp = rqstp->rq_argp;

        return argp->opcnt == resp->opcnt;
}

const struct nfsd4_operation *OPDESC(struct nfsd4_op *op);
int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op);
void warn_on_nonidempotent_op(struct nfsd4_op *op);

#define NFS4_SVC_XDRSIZE                sizeof(struct nfsd4_compoundargs)

static inline void
set_change_info(struct nfsd4_change_info *cinfo, struct svc_fh *fhp)
{
        BUG_ON(!fhp->fh_pre_saved);
        cinfo->atomic = (u32)(fhp->fh_post_saved && !fhp->fh_no_atomic_attr);

        cinfo->before_change = fhp->fh_pre_change;
        cinfo->after_change = fhp->fh_post_change;
}


bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp);
int nfs4svc_decode_compoundargs(struct svc_rqst *, __be32 *);
int nfs4svc_encode_compoundres(struct svc_rqst *, __be32 *);
__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *, u32);
void nfsd4_encode_operation(struct nfsd4_compoundres *, struct nfsd4_op *);
void nfsd4_encode_replay(struct xdr_stream *xdr, struct nfsd4_op *op);
__be32 nfsd4_encode_fattr_to_buf(__be32 **p, int words,
                struct svc_fh *fhp, struct svc_export *exp,
                struct dentry *dentry,
                u32 *bmval, struct svc_rqst *, int ignore_crossmnt);
extern __be32 nfsd4_setclientid(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_exchange_id(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_backchannel_ctl(struct svc_rqst *,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_bind_conn_to_session(struct svc_rqst *,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_create_session(struct svc_rqst *,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_sequence(struct svc_rqst *,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern void nfsd4_sequence_done(struct nfsd4_compoundres *resp);
extern __be32 nfsd4_destroy_session(struct svc_rqst *,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_destroy_clientid(struct svc_rqst *, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
__be32 nfsd4_reclaim_complete(struct svc_rqst *, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
extern __be32 nfsd4_process_open1(struct nfsd4_compound_state *,
                struct nfsd4_open *open, struct nfsd_net *nn);
extern __be32 nfsd4_process_open2(struct svc_rqst *rqstp,
                struct svc_fh *current_fh, struct nfsd4_open *open);
extern void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate);
extern void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
                struct nfsd4_open *open);
extern __be32 nfsd4_open_confirm(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
extern __be32 nfsd4_open_downgrade(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
extern __be32 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
extern __be32 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
extern __be32
nfsd4_release_lockowner(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern void nfsd4_release_compoundargs(struct svc_rqst *rqstp);
extern __be32 nfsd4_delegreturn(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *u);
extern __be32 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *,
                union nfsd4_op_u *u);
extern __be32 nfsd4_test_stateid(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *);
extern __be32 nfsd4_free_stateid(struct svc_rqst *rqstp,
                struct nfsd4_compound_state *, union nfsd4_op_u *);
extern void nfsd4_bump_seqid(struct nfsd4_compound_state *, __be32 nfserr);

enum nfsd4_op_flags {
        ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
        ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
        ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
        /* For rfc 5661 section 2.6.3.1.1: */
        OP_HANDLES_WRONGSEC = 1 << 3,
        OP_IS_PUTFH_LIKE = 1 << 4,
        /*
         * These are the ops whose result size we estimate before
         * encoding, to avoid performing an op then not being able to
         * respond or cache a response.  This includes writes and setattrs
         * as well as the operations usually called "nonidempotent":
         */
        OP_MODIFIES_SOMETHING = 1 << 5,
        /*
         * Cache compounds containing these ops in the xid-based drc:
         * We use the DRC for compounds containing non-idempotent
         * operations, *except* those that are 4.1-specific (since
         * sessions provide their own EOS), and except for stateful
         * operations other than setclientid and setclientid_confirm
         * (since sequence numbers provide EOS for open, lock, etc in
         * the v4.0 case).
         */
        OP_CACHEME = 1 << 6,
        /*
         * These are ops which clear current state id.
         */
        OP_CLEAR_STATEID = 1 << 7,
        /* Most ops return only an error on failure; some may do more: */
        OP_NONTRIVIAL_ERROR_ENCODE = 1 << 8,
};

struct nfsd4_operation {
        __be32 (*op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
                        union nfsd4_op_u *);
        void (*op_release)(union nfsd4_op_u *);
        u32 op_flags;
        char *op_name;
        /* Try to get response size before operation */
        u32 (*op_rsize_bop)(struct svc_rqst *, struct nfsd4_op *);
        void (*op_get_currentstateid)(struct nfsd4_compound_state *,
                        union nfsd4_op_u *);
        void (*op_set_currentstateid)(struct nfsd4_compound_state *,
                        union nfsd4_op_u *);
};


#endif