fs/nfsd/state.h

   1 /*
   2  *  Copyright (c) 2001 The Regents of the University of Michigan.
   3  *  All rights reserved.
   4  *
   5  *  Kendrick Smith <kmsmith@umich.edu>
   6  *  Andy Adamson <andros@umich.edu>
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions
  10  *  are met:
  11  *
  12  *  1. Redistributions of source code must retain the above copyright
  13  *     notice, this list of conditions and the following disclaimer.
  14  *  2. Redistributions in binary form must reproduce the above copyright
  15  *     notice, this list of conditions and the following disclaimer in the
  16  *     documentation and/or other materials provided with the distribution.
  17  *  3. Neither the name of the University nor the names of its
  18  *     contributors may be used to endorse or promote products derived
  19  *     from this software without specific prior written permission.
  20  *
  21  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  24  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  28  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  29  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  31  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #ifndef _NFSD4_STATE_H
  36 #define _NFSD4_STATE_H
  37
  38 #include <linux/idr.h>
  39 #include <linux/sunrpc/svc_xprt.h>
  40 #include "nfsfh.h"
  41
  42 typedef struct {
  43         u32             cl_boot;
  44         u32             cl_id;
  45 } clientid_t;
  46
  47 typedef struct {
  48         clientid_t      so_clid;
  49         u32             so_id;
  50 } stateid_opaque_t;
  51
  52 typedef struct {
  53         u32                     si_generation;
  54         stateid_opaque_t        si_opaque;
  55 } stateid_t;
  56
  57 #define STATEID_FMT     "(%08x/%08x/%08x/%08x)"
  58 #define STATEID_VAL(s) \
  59         (s)->si_opaque.so_clid.cl_boot, \
  60         (s)->si_opaque.so_clid.cl_id, \
  61         (s)->si_opaque.so_id, \
  62         (s)->si_generation
  63
  64 struct nfsd4_callback {
  65         struct nfs4_client *cb_clp;
  66         struct list_head cb_per_client;
  67         u32 cb_minorversion;
  68         struct rpc_message cb_msg;
  69         struct nfsd4_callback_ops *cb_ops;
  70         struct work_struct cb_work;
  71         bool cb_done;
  72 };
  73
  74 struct nfsd4_callback_ops {
  75         void (*prepare)(struct nfsd4_callback *);
  76         int (*done)(struct nfsd4_callback *, struct rpc_task *);
  77         void (*release)(struct nfsd4_callback *);
  78 };
  79
  80 /*
  81  * A core object that represents a "common" stateid. These are generally
  82  * embedded within the different (more specific) stateid objects and contain
  83  * fields that are of general use to any stateid.
  84  */
  85 struct nfs4_stid {
  86         atomic_t sc_count;
  87 #define NFS4_OPEN_STID 1
  88 #define NFS4_LOCK_STID 2
  89 #define NFS4_DELEG_STID 4
  90 /* For an open stateid kept around *only* to process close replays: */
  91 #define NFS4_CLOSED_STID 8
  92 /* For a deleg stateid kept around only to process free_stateid's: */
  93 #define NFS4_REVOKED_DELEG_STID 16
  94 #define NFS4_CLOSED_DELEG_STID 32
  95         unsigned char sc_type;
  96         stateid_t sc_stateid;
  97         struct nfs4_client *sc_client;
  98         struct nfs4_file *sc_file;
  99         void (*sc_free)(struct nfs4_stid *);
 100 };
 101
 102 /*
 103  * Represents a delegation stateid. The nfs4_client holds references to these
 104  * and they are put when it is being destroyed or when the delegation is
 105  * returned by the client:
 106  *
 107  * o 1 reference as long as a delegation is still in force (taken when it's
 108  *   alloc'd, put when it's returned or revoked)
 109  *
 110  * o 1 reference as long as a recall rpc is in progress (taken when the lease
 111  *   is broken, put when the rpc exits)
 112  *
 113  * o 1 more ephemeral reference for each nfsd thread currently doing something
 114  *   with that delegation without holding the cl_lock
 115  *
 116  * If the server attempts to recall a delegation and the client doesn't do so
 117  * before a timeout, the server may also revoke the delegation. In that case,
 118  * the object will either be destroyed (v4.0) or moved to a per-client list of
 119  * revoked delegations (v4.1+).
 120  *
 121  * This object is a superset of the nfs4_stid.
 122  */
 123 struct nfs4_delegation {
 124         struct nfs4_stid        dl_stid; /* must be first field */
 125         struct list_head        dl_perfile;
 126         struct list_head        dl_perclnt;
 127         struct list_head        dl_recall_lru;  /* delegation recalled */
 128         u32                     dl_type;
 129         time_t                  dl_time;
 130 /* For recall: */
 131         int                     dl_retries;
 132         struct nfsd4_callback   dl_recall;
 133 };
 134
 135 #define cb_to_delegation(cb) \
 136         container_of(cb, struct nfs4_delegation, dl_recall)
 137
 138 /* client delegation callback info */
 139 struct nfs4_cb_conn {
 140         /* SETCLIENTID info */
 141         struct sockaddr_storage cb_addr;
 142         struct sockaddr_storage cb_saddr;
 143         size_t                  cb_addrlen;
 144         u32                     cb_prog; /* used only in 4.0 case;
 145                                             per-session otherwise */
 146         u32                     cb_ident;       /* minorversion 0 only */
 147         struct svc_xprt         *cb_xprt;       /* minorversion 1 only */
 148 };
 149
 150 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
 151 {
 152         return container_of(s, struct nfs4_delegation, dl_stid);
 153 }
 154
 155 /* Maximum number of slots per session. 160 is useful for long haul TCP */
 156 #define NFSD_MAX_SLOTS_PER_SESSION     160
 157 /* Maximum number of operations per session compound */
 158 #define NFSD_MAX_OPS_PER_COMPOUND       16
 159 /* Maximum  session per slot cache size */
 160 #define NFSD_SLOT_CACHE_SIZE            2048
 161 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
 162 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION       32
 163 #define NFSD_MAX_MEM_PER_SESSION  \
 164                 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
 165
 166 struct nfsd4_slot {
 167         u32     sl_seqid;
 168         __be32  sl_status;
 169         u32     sl_datalen;
 170         u16     sl_opcnt;
 171 #define NFSD4_SLOT_INUSE        (1 << 0)
 172 #define NFSD4_SLOT_CACHETHIS    (1 << 1)
 173 #define NFSD4_SLOT_INITIALIZED  (1 << 2)
 174         u8      sl_flags;
 175         char    sl_data[];
 176 };
 177
 178 struct nfsd4_channel_attrs {
 179         u32             headerpadsz;
 180         u32             maxreq_sz;
 181         u32             maxresp_sz;
 182         u32             maxresp_cached;
 183         u32             maxops;
 184         u32             maxreqs;
 185         u32             nr_rdma_attrs;
 186         u32             rdma_attrs;
 187 };
 188
 189 struct nfsd4_cb_sec {
 190         u32     flavor; /* (u32)(-1) used to mean "no valid flavor" */
 191         kuid_t  uid;
 192         kgid_t  gid;
 193 };
 194
 195 struct nfsd4_create_session {
 196         clientid_t                      clientid;
 197         struct nfs4_sessionid           sessionid;
 198         u32                             seqid;
 199         u32                             flags;
 200         struct nfsd4_channel_attrs      fore_channel;
 201         struct nfsd4_channel_attrs      back_channel;
 202         u32                             callback_prog;
 203         struct nfsd4_cb_sec             cb_sec;
 204 };
 205
 206 struct nfsd4_backchannel_ctl {
 207         u32     bc_cb_program;
 208         struct nfsd4_cb_sec             bc_cb_sec;
 209 };
 210
 211 struct nfsd4_bind_conn_to_session {
 212         struct nfs4_sessionid           sessionid;
 213         u32                             dir;
 214 };
 215
 216 /* The single slot clientid cache structure */
 217 struct nfsd4_clid_slot {
 218         u32                             sl_seqid;
 219         __be32                          sl_status;
 220         struct nfsd4_create_session     sl_cr_ses;
 221 };
 222
 223 struct nfsd4_conn {
 224         struct list_head cn_persession;
 225         struct svc_xprt *cn_xprt;
 226         struct svc_xpt_user cn_xpt_user;
 227         struct nfsd4_session *cn_session;
 228 /* CDFC4_FORE, CDFC4_BACK: */
 229         unsigned char cn_flags;
 230 };
 231
 232 /*
 233  * Representation of a v4.1+ session. These are refcounted in a similar fashion
 234  * to the nfs4_client. References are only taken when the server is actively
 235  * working on the object (primarily during the processing of compounds).
 236  */
 237 struct nfsd4_session {
 238         atomic_t                se_ref;
 239         struct list_head        se_hash;        /* hash by sessionid */
 240         struct list_head        se_perclnt;
 241 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
 242 #define NFS4_SESSION_DEAD       0x010
 243         u32                     se_flags;
 244         struct nfs4_client      *se_client;
 245         struct nfs4_sessionid   se_sessionid;
 246         struct nfsd4_channel_attrs se_fchannel;
 247         struct nfsd4_channel_attrs se_bchannel;
 248         struct nfsd4_cb_sec     se_cb_sec;
 249         struct list_head        se_conns;
 250         u32                     se_cb_prog;
 251         u32                     se_cb_seq_nr;
 252         struct nfsd4_slot       *se_slots[];    /* forward channel slots */
 253 };
 254
 255 /* formatted contents of nfs4_sessionid */
 256 struct nfsd4_sessionid {
 257         clientid_t      clientid;
 258         u32             sequence;
 259         u32             reserved;
 260 };
 261
 262 #define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
 263
 264 /*
 265  * struct nfs4_client - one per client.  Clientids live here.
 266  *
 267  * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
 268  * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
 269  * Each nfsd_net_ns object contains a set of these and they are tracked via
 270  * short and long form clientid. They are hashed and searched for under the
 271  * per-nfsd_net client_lock spinlock.
 272  *
 273  * References to it are only held during the processing of compounds, and in
 274  * certain other operations. In their "resting state" they have a refcount of
 275  * 0. If they are not renewed within a lease period, they become eligible for
 276  * destruction by the laundromat.
 277  *
 278  * These objects can also be destroyed prematurely by the fault injection code,
 279  * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
 280  * Care is taken *not* to do this however when the objects have an elevated
 281  * refcount.
 282  *
 283  * o Each nfs4_client is hashed by clientid
 284  *
 285  * o Each nfs4_clients is also hashed by name (the opaque quantity initially
 286  *   sent by the client to identify itself).
 287  *
 288  * o cl_perclient list is used to ensure no dangling stateowner references
 289  *   when we expire the nfs4_client
 290  */
 291 struct nfs4_client {
 292         struct list_head        cl_idhash;      /* hash by cl_clientid.id */
 293         struct rb_node          cl_namenode;    /* link into by-name trees */
 294         struct list_head        *cl_ownerstr_hashtbl;
 295         struct list_head        cl_openowners;
 296         struct idr              cl_stateids;    /* stateid lookup */
 297         struct list_head        cl_delegations;
 298         struct list_head        cl_revoked;     /* unacknowledged, revoked 4.1 state */
 299         struct list_head        cl_lru;         /* tail queue */
 300         struct xdr_netobj       cl_name;        /* id generated by client */
 301         nfs4_verifier           cl_verifier;    /* generated by client */
 302         time_t                  cl_time;        /* time of last lease renewal */
 303         struct sockaddr_storage cl_addr;        /* client ipaddress */
 304         bool                    cl_mach_cred;   /* SP4_MACH_CRED in force */
 305         struct svc_cred         cl_cred;        /* setclientid principal */
 306         clientid_t              cl_clientid;    /* generated by server */
 307         nfs4_verifier           cl_confirm;     /* generated by server */
 308         u32                     cl_minorversion;
 309
 310         /* for v4.0 and v4.1 callbacks: */
 311         struct nfs4_cb_conn     cl_cb_conn;
 312 #define NFSD4_CLIENT_CB_UPDATE          (0)
 313 #define NFSD4_CLIENT_CB_KILL            (1)
 314 #define NFSD4_CLIENT_STABLE             (2)     /* client on stable storage */
 315 #define NFSD4_CLIENT_RECLAIM_COMPLETE   (3)     /* reclaim_complete done */
 316 #define NFSD4_CLIENT_CONFIRMED          (4)     /* client is confirmed */
 317 #define NFSD4_CLIENT_UPCALL_LOCK        (5)     /* upcall serialization */
 318 #define NFSD4_CLIENT_CB_FLAG_MASK       (1 << NFSD4_CLIENT_CB_UPDATE | \
 319                                          1 << NFSD4_CLIENT_CB_KILL)
 320         unsigned long           cl_flags;
 321         struct rpc_cred         *cl_cb_cred;
 322         struct rpc_clnt         *cl_cb_client;
 323         u32                     cl_cb_ident;
 324 #define NFSD4_CB_UP             0
 325 #define NFSD4_CB_UNKNOWN        1
 326 #define NFSD4_CB_DOWN           2
 327 #define NFSD4_CB_FAULT          3
 328         int                     cl_cb_state;
 329         struct nfsd4_callback   cl_cb_null;
 330         struct nfsd4_session    *cl_cb_session;
 331         struct list_head        cl_callbacks; /* list of in-progress callbacks */
 332
 333         /* for all client information that callback code might need: */
 334         spinlock_t              cl_lock;
 335
 336         /* for nfs41 */
 337         struct list_head        cl_sessions;
 338         struct nfsd4_clid_slot  cl_cs_slot;     /* create_session slot */
 339         u32                     cl_exchange_flags;
 340         /* number of rpc's in progress over an associated session: */
 341         atomic_t                cl_refcount;
 342
 343         /* for nfs41 callbacks */
 344         /* We currently support a single back channel with a single slot */
 345         unsigned long           cl_cb_slot_busy;
 346         struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
 347                                                 /* wait here for slots */
 348         struct net              *net;
 349 };
 350
 351 /* struct nfs4_client_reset
 352  * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
 353  * upon lease reset, or from upcall to state_daemon (to read in state
 354  * from non-volitile storage) upon reboot.
 355  */
 356 struct nfs4_client_reclaim {
 357         struct list_head        cr_strhash;     /* hash by cr_name */
 358         struct nfs4_client      *cr_clp;        /* pointer to associated clp */
 359         char                    cr_recdir[HEXDIR_LEN]; /* recover dir */
 360 };
 361
 362 static inline void
 363 update_stateid(stateid_t *stateid)
 364 {
 365         stateid->si_generation++;
 366         /* Wraparound recommendation from 3530bis-13 9.1.3.2: */
 367         if (stateid->si_generation == 0)
 368                 stateid->si_generation = 1;
 369 }
 370
 371 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
 372  * The OPEN response, typically the largest, requires
 373  *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) +
 374  *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
 375  *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
 376  */
 377
 378 #define NFSD4_REPLAY_ISIZE       112
 379
 380 /*
 381  * Replay buffer, where the result of the last seqid-mutating operation
 382  * is cached.
 383  */
 384 struct nfs4_replay {
 385         __be32                  rp_status;
 386         unsigned int            rp_buflen;
 387         char                    *rp_buf;
 388         struct knfsd_fh         rp_openfh;
 389         struct mutex            rp_mutex;
 390         char                    rp_ibuf[NFSD4_REPLAY_ISIZE];
 391 };
 392
 393 struct nfs4_stateowner;
 394
 395 struct nfs4_stateowner_operations {
 396         void (*so_unhash)(struct nfs4_stateowner *);
 397         void (*so_free)(struct nfs4_stateowner *);
 398 };
 399
 400 /*
 401  * A core object that represents either an open or lock owner. The object and
 402  * lock owner objects have one of these embedded within them. Refcounts and
 403  * other fields common to both owner types are contained within these
 404  * structures.
 405  */
 406 struct nfs4_stateowner {
 407         struct list_head                        so_strhash;
 408         struct list_head                        so_stateids;
 409         struct nfs4_client                      *so_client;
 410         const struct nfs4_stateowner_operations *so_ops;
 411         /* after increment in nfsd4_bump_seqid, represents the next
 412          * sequence id expected from the client: */
 413         atomic_t                                so_count;
 414         u32                                     so_seqid;
 415         struct xdr_netobj                       so_owner; /* open owner name */
 416         struct nfs4_replay                      so_replay;
 417         bool                                    so_is_open_owner;
 418 };
 419
 420 /*
 421  * When a file is opened, the client provides an open state owner opaque string
 422  * that indicates the "owner" of that open. These objects are refcounted.
 423  * References to it are held by each open state associated with it. This object
 424  * is a superset of the nfs4_stateowner struct.
 425  */
 426 struct nfs4_openowner {
 427         struct nfs4_stateowner  oo_owner; /* must be first field */
 428         struct list_head        oo_perclient;
 429         /*
 430          * We keep around openowners a little while after last close,
 431          * which saves clients from having to confirm, and allows us to
 432          * handle close replays if they come soon enough.  The close_lru
 433          * is a list of such openowners, to be reaped by the laundromat
 434          * thread eventually if they remain unused:
 435          */
 436         struct list_head        oo_close_lru;
 437         struct nfs4_ol_stateid *oo_last_closed_stid;
 438         time_t                  oo_time; /* time of placement on so_close_lru */
 439 #define NFS4_OO_CONFIRMED   1
 440         unsigned char           oo_flags;
 441 };
 442
 443 /*
 444  * Represents a generic "lockowner". Similar to an openowner. References to it
 445  * are held by the lock stateids that are created on its behalf. This object is
 446  * a superset of the nfs4_stateowner struct (or would be if it needed any extra
 447  * fields).
 448  */
 449 struct nfs4_lockowner {
 450         struct nfs4_stateowner  lo_owner; /* must be first element */
 451 };
 452
 453 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
 454 {
 455         return container_of(so, struct nfs4_openowner, oo_owner);
 456 }
 457
 458 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 459 {
 460         return container_of(so, struct nfs4_lockowner, lo_owner);
 461 }
 462
 463 /*
 464  * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
 465  *
 466  * These objects are global. nfsd keeps one instance of a nfs4_file per
 467  * filehandle (though it may keep multiple file descriptors for each). Each
 468  * inode can have multiple filehandles associated with it, so there is
 469  * (potentially) a many to one relationship between this struct and struct
 470  * inode.
 471  *
 472  * These are hashed by filehandle in the file_hashtbl, which is protected by
 473  * the global state_lock spinlock.
 474  */
 475 struct nfs4_file {
 476         atomic_t                fi_ref;
 477         spinlock_t              fi_lock;
 478         struct hlist_node       fi_hash;        /* hash on fi_fhandle */
 479         struct list_head        fi_stateids;
 480         union {
 481                 struct list_head        fi_delegations;
 482                 struct rcu_head         fi_rcu;
 483         };
 484         /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
 485         struct file *           fi_fds[3];
 486         /*
 487          * Each open or lock stateid contributes 0-4 to the counts
 488          * below depending on which bits are set in st_access_bitmap:
 489          *     1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
 490          *   + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
 491          *   + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
 492          */
 493         atomic_t                fi_access[2];
 494         u32                     fi_share_deny;
 495         struct file             *fi_deleg_file;
 496         atomic_t                fi_delegees;
 497         struct knfsd_fh         fi_fhandle;
 498         bool                    fi_had_conflict;
 499 };
 500
 501 /*
 502  * A generic struct representing either a open or lock stateid. The nfs4_client
 503  * holds a reference to each of these objects, and they in turn hold a
 504  * reference to their respective stateowners. The client's reference is
 505  * released in response to a close or unlock (depending on whether it's an open
 506  * or lock stateid) or when the client is being destroyed.
 507  *
 508  * In the case of v4.0 open stateids, these objects are preserved for a little
 509  * while after close in order to handle CLOSE replays. Those are eventually
 510  * reclaimed via a LRU scheme by the laundromat.
 511  *
 512  * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
 513  * Better suggestions welcome.
 514  */
 515 struct nfs4_ol_stateid {
 516         struct nfs4_stid    st_stid; /* must be first field */
 517         struct list_head              st_perfile;
 518         struct list_head              st_perstateowner;
 519         struct list_head              st_locks;
 520         struct nfs4_stateowner      * st_stateowner;
 521         unsigned char                 st_access_bmap;
 522         unsigned char                 st_deny_bmap;
 523         struct nfs4_ol_stateid         * st_openstp;
 524 };
 525
 526 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
 527 {
 528         return container_of(s, struct nfs4_ol_stateid, st_stid);
 529 }
 530
 531 /* flags for preprocess_seqid_op() */
 532 #define RD_STATE                0x00000010
 533 #define WR_STATE                0x00000020
 534
 535 enum nfsd4_cb_op {
 536         NFSPROC4_CLNT_CB_NULL = 0,
 537         NFSPROC4_CLNT_CB_RECALL,
 538         NFSPROC4_CLNT_CB_SEQUENCE,
 539 };
 540
 541
 542 struct nfsd4_compound_state;
 543 struct nfsd_net;
 544
 545 extern __be32 nfs4_preprocess_stateid_op(struct net *net,
 546                 struct nfsd4_compound_state *cstate,
 547                 stateid_t *stateid, int flags, struct file **filp);
 548 void nfs4_put_stid(struct nfs4_stid *s);
 549 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
 550 extern void nfs4_release_reclaim(struct nfsd_net *);
 551 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
 552                                                         struct nfsd_net *nn);
 553 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
 554                 struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
 555 extern int set_callback_cred(void);
 556 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 557 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 558 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
 559 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
 560                 struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
 561 extern void nfsd4_run_cb(struct nfsd4_callback *cb);
 562 extern int nfsd4_create_callback_queue(void);
 563 extern void nfsd4_destroy_callback_queue(void);
 564 extern void nfsd4_shutdown_callback(struct nfs4_client *);
 565 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
 566 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
 567                                                         struct nfsd_net *nn);
 568 extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
 569
 570 /* grace period management */
 571 void nfsd4_end_grace(struct nfsd_net *nn);
 572
 573 /* nfs4recover operations */
 574 extern int nfsd4_client_tracking_init(struct net *net);
 575 extern void nfsd4_client_tracking_exit(struct net *net);
 576 extern void nfsd4_client_record_create(struct nfs4_client *clp);
 577 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
 578 extern int nfsd4_client_record_check(struct nfs4_client *clp);
 579 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
 580
 581 /* nfs fault injection functions */
 582 #ifdef CONFIG_NFSD_FAULT_INJECTION
 583 int nfsd_fault_inject_init(void);
 584 void nfsd_fault_inject_cleanup(void);
 585
 586 u64 nfsd_inject_print_clients(void);
 587 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t);
 588 u64 nfsd_inject_forget_clients(u64);
 589
 590 u64 nfsd_inject_print_locks(void);
 591 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t);
 592 u64 nfsd_inject_forget_locks(u64);
 593
 594 u64 nfsd_inject_print_openowners(void);
 595 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t);
 596 u64 nfsd_inject_forget_openowners(u64);
 597
 598 u64 nfsd_inject_print_delegations(void);
 599 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t);
 600 u64 nfsd_inject_forget_delegations(u64);
 601 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t);
 602 u64 nfsd_inject_recall_delegations(u64);
 603 #else /* CONFIG_NFSD_FAULT_INJECTION */
 604 static inline int nfsd_fault_inject_init(void) { return 0; }
 605 static inline void nfsd_fault_inject_cleanup(void) {}
 606 #endif /* CONFIG_NFSD_FAULT_INJECTION */
 607
 608 #endif   /* NFSD4_STATE_H */