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/*
 *  linux/include/nfsd/state.h
 *
 *  Copyright (c) 2001 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 _NFSD4_STATE_H
#define _NFSD4_STATE_H

#include <linux/list.h>

#define NFS4_OPAQUE_LIMIT 1024
typedef struct {
        u32             cl_boot;
        u32             cl_id;
} clientid_t;

typedef struct {
        u32             so_boot;
        u32             so_stateownerid;
        u32             so_fileid;
} stateid_opaque_t;

typedef struct {
        u32                     si_generation;
        stateid_opaque_t        si_opaque;
} stateid_t;
#define si_boot           si_opaque.so_boot
#define si_stateownerid   si_opaque.so_stateownerid
#define si_fileid         si_opaque.so_fileid

extern stateid_t zerostateid;
extern stateid_t onestateid;

#define ZERO_STATEID(stateid)       (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
#define ONE_STATEID(stateid)        (!memcmp((stateid), &onestateid, sizeof(stateid_t)))

/*
 * struct nfs4_client - one per client.  Clientids live here.
 *      o Each nfs4_client is hashed by clientid.
 *
 *      o Each nfs4_clients is also hashed by name
 *        (the opaque quantity initially sent by the client to identify itself).
 *        
 *      o cl_perclient list is used to ensure no dangling stateowner references
 *        when we expire the nfs4_client
 */

struct nfs4_client {
        struct list_head        cl_idhash;      /* hash by cl_clientid.id */
        struct list_head        cl_strhash;     /* hash by cl_name */
        struct list_head        cl_perclient;   /* list: stateowners */
        struct list_head        cl_lru;         /* tail queue */
        struct xdr_netobj       cl_name;        /* id generated by client */
        nfs4_verifier           cl_verifier;    /* generated by client */
        time_t                  cl_time;        /* time of last lease renewal */
        u32                     cl_addr;        /* client ipaddress */
        struct svc_cred         cl_cred;        /* setclientid principal */
        clientid_t              cl_clientid;    /* generated by server */
        nfs4_verifier           cl_confirm;     /* generated by server */
};

static inline void
update_stateid(stateid_t *stateid)
{
        stateid->si_generation++;
}

/* A reasonable value for REPLAY_ISIZE was estimated as follows:  
 * The OPEN response, typically the largest, requires
 *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) +
 *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
 *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
 */


#define NFSD4_REPLAY_ISIZE       112

/*
 * Replay buffer, where the result of the last seqid-mutating operation
 * is cached.
 */

struct nfs4_replay {
        u32                     rp_status;
        unsigned int            rp_buflen;
        char                    *rp_buf;
        unsigned                intrp_allocated;
        char                    rp_ibuf[NFSD4_REPLAY_ISIZE];
};

/*
* nfs4_stateowner can either be an open_owner, or a lock_owner
*
*    so_idhash:  stateid_hashtbl[] for open owner, lockstateid_hashtbl[]
*         for lock_owner
*    so_strhash: ownerstr_hashtbl[] for open_owner, lock_ownerstr_hashtbl[]
*         for lock_owner
*    so_perclient: nfs4_client->cl_perclient entry - used when nfs4_client
*         struct is reaped.
*    so_perfilestate: heads the list of nfs4_stateid (either open or lock)
*         and is used to ensure no dangling nfs4_stateid references when we
*         release a stateowner.
*/

struct nfs4_stateowner {
        struct list_head        so_idhash;   /* hash by so_id */
        struct list_head        so_strhash;   /* hash by op_name */
        struct list_head        so_perclient; /* nfs4_client->cl_perclient */
        struct list_head        so_perfilestate; /* list: nfs4_stateid */
        int                     so_is_open_owner; /* 1=openowner,0=lockowner */
        u32                     so_id;
        struct nfs4_client *    so_client;
        u32                     so_seqid;    
        struct xdr_netobj       so_owner;     /* open owner name */
        int                     so_confirmed; /* successful OPEN_CONFIRM? */
        struct nfs4_replay      so_replay;
};

/*
*  nfs4_file: a file opened by some number of (open) nfs4_stateowners.
*    o fi_perfile list is used to search for conflicting
*      share_acces, share_deny on the file.
*/

struct nfs4_file {
        struct list_head        fi_hash;    /* hash by "struct inode *" */
        struct list_head        fi_perfile; /* list: nfs4_stateid */
        struct inode            *fi_inode;
        u32                     fi_id;      /* used with stateowner->so_id
                                             * for stateid_hashtbl hash */

};

/*
* nfs4_stateid can either be an open stateid or (eventually) a lock stateid
*
* (open)nfs4_stateid: one per (open)nfs4_stateowner, nfs4_file
*
*       st_hash: stateid_hashtbl[] entry or lockstateid_hashtbl entry
*       st_perfile: file_hashtbl[] entry.
*       st_perfile_state: nfs4_stateowner->so_perfilestate
*       st_share_access: used only for open stateid
*       st_share_deny: used only for open stateid
*/


struct nfs4_stateid {
        struct list_head              st_hash;
        struct list_head              st_perfile;
        struct list_head              st_perfilestate;
        struct nfs4_stateowner      * st_stateowner;
        struct nfs4_file            * st_file;
        stateid_t                     st_stateid;
        struct file                   st_vfs_file;
        int                           st_vfs_set;
        unsigned int                  st_share_access;
        unsigned int                  st_share_deny;
};

/* flags for preprocess_seqid_op() */
#define CHECK_FH                0x00000001
#define CONFIRM                 0x00000002
#define OPEN_STATE              0x00000004
#define LOCK_STATE              0x00000008
#define RDWR_STATE              0x00000010

#define seqid_mutating_err(err)                       \
        (((err) != nfserr_stale_clientid) &&    \
        ((err) != nfserr_bad_seqid) &&          \
        ((err) != nfserr_stale_stateid) &&      \
        ((err) != nfserr_bad_stateid))


extern time_t nfs4_laundromat(void);
extern int nfsd4_renew(clientid_t *clid);
extern int nfs4_preprocess_stateid_op(struct svc_fh *current_fh,
                stateid_t *stateid, int flags, struct nfs4_stateid **stpp);
extern int nfs4_share_conflict(struct svc_fh *current_fh,
                unsigned int deny_type);
extern void nfs4_lock_state(void);
extern void nfs4_unlock_state(void);
#endif   /* NFSD4_STATE_H */