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 /*
  *  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/idr.h>
 #include <linux/refcount.h>
 #include <linux/sunrpc/svc_xprt.h>
 #include "nfsfh.h"
 #include "nfsd.h"
 
 typedef struct {
     u32             cl_boot;
     u32             cl_id;
 } clientid_t;
 
 typedef struct {
     clientid_t  so_clid;
     u32     so_id;
 } stateid_opaque_t;
 
 typedef struct {
     u32                     si_generation;
     stateid_opaque_t        si_opaque;
 } stateid_t;
 
 typedef struct {
     stateid_t       stid;
 #define NFS4_COPY_STID 1
 #define NFS4_COPYNOTIFY_STID 2
     unsigned char       sc_type;
     refcount_t      sc_count;
 } copy_stateid_t;
 
 struct nfsd4_callback {
     struct nfs4_client *cb_clp;
     struct rpc_message cb_msg;
     const struct nfsd4_callback_ops *cb_ops;
     struct work_struct cb_work;
     int cb_seq_status;
     int cb_status;
     bool cb_need_restart;
     bool cb_holds_slot;
 };
 
 struct nfsd4_callback_ops {
     void (*prepare)(struct nfsd4_callback *);
     int (*done)(struct nfsd4_callback *, struct rpc_task *);
     void (*release)(struct nfsd4_callback *);
 };
 
 /*
  * A core object that represents a "common" stateid. These are generally
  * embedded within the different (more specific) stateid objects and contain
  * fields that are of general use to any stateid.
  */
 struct nfs4_stid {
     refcount_t      sc_count;
 #define NFS4_OPEN_STID 1
 #define NFS4_LOCK_STID 2
 #define NFS4_DELEG_STID 4
 /* For an open stateid kept around *only* to process close replays: */
 #define NFS4_CLOSED_STID 8
 /* For a deleg stateid kept around only to process free_stateid's: */
 #define NFS4_REVOKED_DELEG_STID 16
 #define NFS4_CLOSED_DELEG_STID 32
 #define NFS4_LAYOUT_STID 64
     struct list_head    sc_cp_list;
     unsigned char       sc_type;
     stateid_t       sc_stateid;
     spinlock_t      sc_lock;
     struct nfs4_client  *sc_client;
     struct nfs4_file    *sc_file;
     void            (*sc_free)(struct nfs4_stid *);
 };
 
 /* Keep a list of stateids issued by the COPY_NOTIFY, associate it with the
  * parent OPEN/LOCK/DELEG stateid.
  */
 struct nfs4_cpntf_state {
     copy_stateid_t      cp_stateid;
     struct list_head    cp_list;    /* per parent nfs4_stid */
     stateid_t       cp_p_stateid;   /* copy of parent's stateid */
     clientid_t      cp_p_clid;  /* copy of parent's clid */
     time64_t        cpntf_time; /* last time stateid used */
 };
 
 /*
  * Represents a delegation stateid. The nfs4_client holds references to these
  * and they are put when it is being destroyed or when the delegation is
  * returned by the client:
  *
  * o 1 reference as long as a delegation is still in force (taken when it's
  *   alloc'd, put when it's returned or revoked)
  *
  * o 1 reference as long as a recall rpc is in progress (taken when the lease
  *   is broken, put when the rpc exits)
  *
  * o 1 more ephemeral reference for each nfsd thread currently doing something
  *   with that delegation without holding the cl_lock
  *
  * If the server attempts to recall a delegation and the client doesn't do so
  * before a timeout, the server may also revoke the delegation. In that case,
  * the object will either be destroyed (v4.0) or moved to a per-client list of
  * revoked delegations (v4.1+).
  *
  * This object is a superset of the nfs4_stid.
  */
 struct nfs4_delegation {
     struct nfs4_stid    dl_stid; /* must be first field */
     struct list_head    dl_perfile;
     struct list_head    dl_perclnt;
     struct list_head    dl_recall_lru;  /* delegation recalled */
     struct nfs4_clnt_odstate *dl_clnt_odstate;
     u32         dl_type;
     time64_t        dl_time;
 /* For recall: */
     int         dl_retries;
     struct nfsd4_callback   dl_recall;
     bool            dl_recalled;
 };
 
 #define cb_to_delegation(cb) \
     container_of(cb, struct nfs4_delegation, dl_recall)
 
 /* client delegation callback info */
 struct nfs4_cb_conn {
     /* SETCLIENTID info */
     struct sockaddr_storage cb_addr;
     struct sockaddr_storage cb_saddr;
     size_t          cb_addrlen;
     u32                     cb_prog; /* used only in 4.0 case;
                         per-session otherwise */
     u32                     cb_ident;   /* minorversion 0 only */
     struct svc_xprt     *cb_xprt;   /* minorversion 1 only */
 };
 
 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
 {
     return container_of(s, struct nfs4_delegation, dl_stid);
 }
 
 /* Maximum number of slots per session. 160 is useful for long haul TCP */
 #define NFSD_MAX_SLOTS_PER_SESSION     160
 /* Maximum number of operations per session compound */
 #define NFSD_MAX_OPS_PER_COMPOUND   16
 /* Maximum  session per slot cache size */
 #define NFSD_SLOT_CACHE_SIZE        2048
 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION   32
 #define NFSD_MAX_MEM_PER_SESSION  \
         (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
 
 struct nfsd4_slot {
     u32 sl_seqid;
     __be32  sl_status;
     struct svc_cred sl_cred;
     u32 sl_datalen;
     u16 sl_opcnt;
 #define NFSD4_SLOT_INUSE    (1 << 0)
 #define NFSD4_SLOT_CACHETHIS    (1 << 1)
 #define NFSD4_SLOT_INITIALIZED  (1 << 2)
 #define NFSD4_SLOT_CACHED   (1 << 3)
     u8  sl_flags;
     char    sl_data[];
 };
 
 struct nfsd4_channel_attrs {
     u32     headerpadsz;
     u32     maxreq_sz;
     u32     maxresp_sz;
     u32     maxresp_cached;
     u32     maxops;
     u32     maxreqs;
     u32     nr_rdma_attrs;
     u32     rdma_attrs;
 };
 
 struct nfsd4_cb_sec {
     u32 flavor; /* (u32)(-1) used to mean "no valid flavor" */
     kuid_t  uid;
     kgid_t  gid;
 };
 
 struct nfsd4_create_session {
     clientid_t          clientid;
     struct nfs4_sessionid       sessionid;
     u32             seqid;
     u32             flags;
     struct nfsd4_channel_attrs  fore_channel;
     struct nfsd4_channel_attrs  back_channel;
     u32             callback_prog;
     struct nfsd4_cb_sec     cb_sec;
 };
 
 struct nfsd4_backchannel_ctl {
     u32 bc_cb_program;
     struct nfsd4_cb_sec     bc_cb_sec;
 };
 
 struct nfsd4_bind_conn_to_session {
     struct nfs4_sessionid       sessionid;
     u32             dir;
 };
 
 /* The single slot clientid cache structure */
 struct nfsd4_clid_slot {
     u32             sl_seqid;
     __be32              sl_status;
     struct nfsd4_create_session sl_cr_ses;
 };
 
 struct nfsd4_conn {
     struct list_head cn_persession;
     struct svc_xprt *cn_xprt;
     struct svc_xpt_user cn_xpt_user;
     struct nfsd4_session *cn_session;
 /* CDFC4_FORE, CDFC4_BACK: */
     unsigned char cn_flags;
 };
 
 /*
  * Representation of a v4.1+ session. These are refcounted in a similar fashion
  * to the nfs4_client. References are only taken when the server is actively
  * working on the object (primarily during the processing of compounds).
  */
 struct nfsd4_session {
     atomic_t        se_ref;
     struct list_head    se_hash;    /* hash by sessionid */
     struct list_head    se_perclnt;
 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
 #define NFS4_SESSION_DEAD   0x010
     u32         se_flags;
     struct nfs4_client  *se_client;
     struct nfs4_sessionid   se_sessionid;
     struct nfsd4_channel_attrs se_fchannel;
     struct nfsd4_channel_attrs se_bchannel;
     struct nfsd4_cb_sec se_cb_sec;
     struct list_head    se_conns;
     u32         se_cb_prog;
     u32         se_cb_seq_nr;
     struct nfsd4_slot   *se_slots[];    /* forward channel slots */
 };
 
 /* formatted contents of nfs4_sessionid */
 struct nfsd4_sessionid {
     clientid_t  clientid;
     u32     sequence;
     u32     reserved;
 };
 
 #define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
 
 /*
  *       State                Meaning                  Where set
  * --------------------------------------------------------------------------
  * | NFSD4_ACTIVE      | Confirmed, active    | Default                     |
  * |------------------- ----------------------------------------------------|
  * | NFSD4_COURTESY    | Courtesy state.      | nfs4_get_client_reaplist    |
  * |                   | Lease/lock/share     |                             |
  * |                   | reservation conflict |                             |
  * |                   | can cause Courtesy   |                             |
  * |                   | client to be expired |                             |
  * |------------------------------------------------------------------------|
  * | NFSD4_EXPIRABLE   | Courtesy client to be| nfs4_laundromat             |
  * |                   | expired by Laundromat| try_to_expire_client        |
  * |                   | due to conflict      |                             |
  * |------------------------------------------------------------------------|
  */
 enum {
     NFSD4_ACTIVE = 0,
     NFSD4_COURTESY,
     NFSD4_EXPIRABLE,
 };
 
 /*
  * struct nfs4_client - one per client.  Clientids live here.
  *
  * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
  * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
  * Each nfsd_net_ns object contains a set of these and they are tracked via
  * short and long form clientid. They are hashed and searched for under the
  * per-nfsd_net client_lock spinlock.
  *
  * References to it are only held during the processing of compounds, and in
  * certain other operations. In their "resting state" they have a refcount of
  * 0. If they are not renewed within a lease period, they become eligible for
  * destruction by the laundromat.
  *
  * These objects can also be destroyed prematurely by the fault injection code,
  * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
  * Care is taken *not* to do this however when the objects have an elevated
  * refcount.
  *
  * 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 rb_node      cl_namenode;    /* link into by-name trees */
     struct list_head    *cl_ownerstr_hashtbl;
     struct list_head    cl_openowners;
     struct idr      cl_stateids;    /* stateid lookup */
     struct list_head    cl_delegations;
     struct list_head    cl_revoked; /* unacknowledged, revoked 4.1 state */
     struct list_head        cl_lru;         /* tail queue */
 #ifdef CONFIG_NFSD_PNFS
     struct list_head    cl_lo_states;   /* outstanding layout states */
 #endif
     struct xdr_netobj   cl_name;    /* id generated by client */
     nfs4_verifier       cl_verifier;    /* generated by client */
     time64_t        cl_time;    /* time of last lease renewal */
     struct sockaddr_storage cl_addr;    /* client ipaddress */
     bool            cl_mach_cred;   /* SP4_MACH_CRED in force */
     struct svc_cred     cl_cred;    /* setclientid principal */
     clientid_t      cl_clientid;    /* generated by server */
     nfs4_verifier       cl_confirm; /* generated by server */
     u32         cl_minorversion;
     /* NFSv4.1 client implementation id: */
     struct xdr_netobj   cl_nii_domain;
     struct xdr_netobj   cl_nii_name;
     struct timespec64   cl_nii_time;
 
     /* for v4.0 and v4.1 callbacks: */
     struct nfs4_cb_conn cl_cb_conn;
 #define NFSD4_CLIENT_CB_UPDATE      (0)
 #define NFSD4_CLIENT_CB_KILL        (1)
 #define NFSD4_CLIENT_STABLE     (2) /* client on stable storage */
 #define NFSD4_CLIENT_RECLAIM_COMPLETE   (3) /* reclaim_complete done */
 #define NFSD4_CLIENT_CONFIRMED      (4) /* client is confirmed */
 #define NFSD4_CLIENT_UPCALL_LOCK    (5) /* upcall serialization */
 #define NFSD4_CLIENT_CB_FLAG_MASK   (1 << NFSD4_CLIENT_CB_UPDATE | \
                      1 << NFSD4_CLIENT_CB_KILL)
     unsigned long       cl_flags;
     const struct cred   *cl_cb_cred;
     struct rpc_clnt     *cl_cb_client;
     u32         cl_cb_ident;
 #define NFSD4_CB_UP     0
 #define NFSD4_CB_UNKNOWN    1
 #define NFSD4_CB_DOWN       2
 #define NFSD4_CB_FAULT      3
     int         cl_cb_state;
     struct nfsd4_callback   cl_cb_null;
     struct nfsd4_session    *cl_cb_session;
 
     /* for all client information that callback code might need: */
     spinlock_t      cl_lock;
 
     /* for nfs41 */
     struct list_head    cl_sessions;
     struct nfsd4_clid_slot  cl_cs_slot; /* create_session slot */
     u32         cl_exchange_flags;
     /* number of rpc's in progress over an associated session: */
     atomic_t        cl_rpc_users;
     struct nfsdfs_client    cl_nfsdfs;
     struct nfs4_op_map      cl_spo_must_allow;
 
     /* debugging info directory under nfsd/clients/ : */
     struct dentry       *cl_nfsd_dentry;
     /* 'info' file within that directory. Ref is not counted,
      * but will remain valid iff cl_nfsd_dentry != NULL
      */
     struct dentry       *cl_nfsd_info_dentry;
 
     /* for nfs41 callbacks */
     /* We currently support a single back channel with a single slot */
     unsigned long       cl_cb_slot_busy;
     struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
                         /* wait here for slots */
     struct net      *net;
     struct list_head    async_copies;   /* list of async copies */
     spinlock_t      async_lock; /* lock for async copies */
     atomic_t        cl_cb_inflight; /* Outstanding callbacks */
 
     unsigned int        cl_state;
     atomic_t        cl_delegs_in_recall;
 };
 
 /* struct nfs4_client_reset
  * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
  * upon lease reset, or from upcall to state_daemon (to read in state
  * from non-volitile storage) upon reboot.
  */
 struct nfs4_client_reclaim {
     struct list_head    cr_strhash; /* hash by cr_name */
     struct nfs4_client  *cr_clp;    /* pointer to associated clp */
     struct xdr_netobj   cr_name;    /* recovery dir name */
     struct xdr_netobj   cr_princhash;
 };
 
 /* 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 {
     __be32          rp_status;
     unsigned int        rp_buflen;
     char            *rp_buf;
     struct knfsd_fh     rp_openfh;
     struct mutex        rp_mutex;
     char            rp_ibuf[NFSD4_REPLAY_ISIZE];
 };
 
 struct nfs4_stateowner;
 
 struct nfs4_stateowner_operations {
     void (*so_unhash)(struct nfs4_stateowner *);
     void (*so_free)(struct nfs4_stateowner *);
 };
 
 /*
  * A core object that represents either an open or lock owner. The object and
  * lock owner objects have one of these embedded within them. Refcounts and
  * other fields common to both owner types are contained within these
  * structures.
  */
 struct nfs4_stateowner {
     struct list_head            so_strhash;
     struct list_head            so_stateids;
     struct nfs4_client          *so_client;
     const struct nfs4_stateowner_operations *so_ops;
     /* after increment in nfsd4_bump_seqid, represents the next
      * sequence id expected from the client: */
     atomic_t                so_count;
     u32                 so_seqid;
     struct xdr_netobj           so_owner; /* open owner name */
     struct nfs4_replay          so_replay;
     bool                    so_is_open_owner;
 };
 
 /*
  * When a file is opened, the client provides an open state owner opaque string
  * that indicates the "owner" of that open. These objects are refcounted.
  * References to it are held by each open state associated with it. This object
  * is a superset of the nfs4_stateowner struct.
  */
 struct nfs4_openowner {
     struct nfs4_stateowner  oo_owner; /* must be first field */
     struct list_head        oo_perclient;
     /*
      * We keep around openowners a little while after last close,
      * which saves clients from having to confirm, and allows us to
      * handle close replays if they come soon enough.  The close_lru
      * is a list of such openowners, to be reaped by the laundromat
      * thread eventually if they remain unused:
      */
     struct list_head    oo_close_lru;
     struct nfs4_ol_stateid *oo_last_closed_stid;
     time64_t        oo_time; /* time of placement on so_close_lru */
 #define NFS4_OO_CONFIRMED   1
     unsigned char       oo_flags;
 };
 
 /*
  * Represents a generic "lockowner". Similar to an openowner. References to it
  * are held by the lock stateids that are created on its behalf. This object is
  * a superset of the nfs4_stateowner struct.
  */
 struct nfs4_lockowner {
     struct nfs4_stateowner  lo_owner;   /* must be first element */
     struct list_head    lo_blocked; /* blocked file_locks */
 };
 
 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
 {
     return container_of(so, struct nfs4_openowner, oo_owner);
 }
 
 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 {
     return container_of(so, struct nfs4_lockowner, lo_owner);
 }
 
 /*
  * Per-client state indicating no. of opens and outstanding delegations
  * on a file from a particular client.'od' stands for 'open & delegation'
  */
 struct nfs4_clnt_odstate {
     struct nfs4_client  *co_client;
     struct nfs4_file    *co_file;
     struct list_head    co_perfile;
     refcount_t      co_odcount;
 };
 
 /*
  * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
  *
  * These objects are global. nfsd keeps one instance of a nfs4_file per
  * filehandle (though it may keep multiple file descriptors for each). Each
  * inode can have multiple filehandles associated with it, so there is
  * (potentially) a many to one relationship between this struct and struct
  * inode.
  *
  * These are hashed by filehandle in the file_hashtbl, which is protected by
  * the global state_lock spinlock.
  */
 struct nfs4_file {
     refcount_t      fi_ref;
     struct inode *      fi_inode;
     bool            fi_aliased;
     spinlock_t      fi_lock;
     struct hlist_node       fi_hash;    /* hash on fi_fhandle */
     struct list_head        fi_stateids;
     union {
         struct list_head    fi_delegations;
         struct rcu_head     fi_rcu;
     };
     struct list_head    fi_clnt_odstate;
     /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
     struct nfsd_file    *fi_fds[3];
     /*
      * Each open or lock stateid contributes 0-4 to the counts
      * below depending on which bits are set in st_access_bitmap:
      *     1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
      *   + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
      *   + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
      */
     atomic_t        fi_access[2];
     u32         fi_share_deny;
     struct nfsd_file    *fi_deleg_file;
     int         fi_delegees;
     struct knfsd_fh     fi_fhandle;
     bool            fi_had_conflict;
 #ifdef CONFIG_NFSD_PNFS
     struct list_head    fi_lo_states;
     atomic_t        fi_lo_recalls;
 #endif
 };
 
 /*
  * A generic struct representing either a open or lock stateid. The nfs4_client
  * holds a reference to each of these objects, and they in turn hold a
  * reference to their respective stateowners. The client's reference is
  * released in response to a close or unlock (depending on whether it's an open
  * or lock stateid) or when the client is being destroyed.
  *
  * In the case of v4.0 open stateids, these objects are preserved for a little
  * while after close in order to handle CLOSE replays. Those are eventually
  * reclaimed via a LRU scheme by the laundromat.
  *
  * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
  * Better suggestions welcome.
  */
 struct nfs4_ol_stateid {
     struct nfs4_stid        st_stid;
     struct list_head        st_perfile;
     struct list_head        st_perstateowner;
     struct list_head        st_locks;
     struct nfs4_stateowner      *st_stateowner;
     struct nfs4_clnt_odstate    *st_clnt_odstate;
 /*
  * These bitmasks use 3 separate bits for READ, ALLOW, and BOTH; see the
  * comment above bmap_to_share_mode() for explanation:
  */
     unsigned char           st_access_bmap;
     unsigned char           st_deny_bmap;
     struct nfs4_ol_stateid      *st_openstp;
     struct mutex            st_mutex;
 };
 
 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
 {
     return container_of(s, struct nfs4_ol_stateid, st_stid);
 }
 
 struct nfs4_layout_stateid {
     struct nfs4_stid        ls_stid;
     struct list_head        ls_perclnt;
     struct list_head        ls_perfile;
     spinlock_t          ls_lock;
     struct list_head        ls_layouts;
     u32             ls_layout_type;
     struct nfsd_file        *ls_file;
     struct nfsd4_callback       ls_recall;
     stateid_t           ls_recall_sid;
     bool                ls_recalled;
     struct mutex            ls_mutex;
 };
 
 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
 {
     return container_of(s, struct nfs4_layout_stateid, ls_stid);
 }
 
 /* flags for preprocess_seqid_op() */
 #define RD_STATE            0x00000010
 #define WR_STATE            0x00000020
 
 enum nfsd4_cb_op {
     NFSPROC4_CLNT_CB_NULL = 0,
     NFSPROC4_CLNT_CB_RECALL,
     NFSPROC4_CLNT_CB_LAYOUT,
     NFSPROC4_CLNT_CB_OFFLOAD,
     NFSPROC4_CLNT_CB_SEQUENCE,
     NFSPROC4_CLNT_CB_NOTIFY_LOCK,
 };
 
 /* Returns true iff a is later than b: */
 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
 {
     return (s32)(a->si_generation - b->si_generation) > 0;
 }
 
 /*
  * When a client tries to get a lock on a file, we set one of these objects
  * on the blocking lock. When the lock becomes free, we can then issue a
  * CB_NOTIFY_LOCK to the server.
  */
 struct nfsd4_blocked_lock {
     struct list_head    nbl_list;
     struct list_head    nbl_lru;
     time64_t        nbl_time;
     struct file_lock    nbl_lock;
     struct knfsd_fh     nbl_fh;
     struct nfsd4_callback   nbl_cb;
     struct kref     nbl_kref;
 };
 
 struct nfsd4_compound_state;
 struct nfsd_net;
 struct nfsd4_copy;
 
 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
         struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
         stateid_t *stateid, int flags, struct nfsd_file **filp,
         struct nfs4_stid **cstid);
 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
              stateid_t *stateid, unsigned char typemask,
              struct nfs4_stid **s, struct nfsd_net *nn);
 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
                   void (*sc_free)(struct nfs4_stid *));
 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy);
 void nfs4_free_copy_state(struct nfsd4_copy *copy);
 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
             struct nfs4_stid *p_stid);
 void nfs4_unhash_stid(struct nfs4_stid *s);
 void nfs4_put_stid(struct nfs4_stid *s);
 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
 extern void nfs4_release_reclaim(struct nfsd_net *);
 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(struct xdr_netobj name,
                             struct nfsd_net *nn);
 extern __be32 nfs4_check_open_reclaim(struct nfs4_client *);
 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
         const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
 extern void nfsd4_run_cb(struct nfsd4_callback *cb);
 extern int nfsd4_create_callback_queue(void);
 extern void nfsd4_destroy_callback_queue(void);
 extern void nfsd4_shutdown_callback(struct nfs4_client *);
 extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name,
                 struct xdr_netobj princhash, struct nfsd_net *nn);
 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn);
 
 void put_nfs4_file(struct nfs4_file *fi);
 extern struct nfsd4_copy *
 find_async_copy(struct nfs4_client *clp, stateid_t *staetid);
 extern void nfs4_put_cpntf_state(struct nfsd_net *nn,
                  struct nfs4_cpntf_state *cps);
 extern __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
                  struct nfs4_client *clp,
                  struct nfs4_cpntf_state **cps);
 static inline void get_nfs4_file(struct nfs4_file *fi)
 {
     refcount_inc(&fi->fi_ref);
 }
 struct nfsd_file *find_any_file(struct nfs4_file *f);
 
 /* grace period management */
 void nfsd4_end_grace(struct nfsd_net *nn);
 
 /* nfs4recover operations */
 extern int nfsd4_client_tracking_init(struct net *net);
 extern void nfsd4_client_tracking_exit(struct net *net);
 extern void nfsd4_client_record_create(struct nfs4_client *clp);
 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
 extern int nfsd4_client_record_check(struct nfs4_client *clp);
 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
 
 static inline bool try_to_expire_client(struct nfs4_client *clp)
 {
     cmpxchg(&clp->cl_state, NFSD4_COURTESY, NFSD4_EXPIRABLE);
     return clp->cl_state == NFSD4_EXPIRABLE;
 }
 #endif   /* NFSD4_STATE_H */

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