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         void *cb_op;
  66         struct nfs4_client *cb_clp;
  67         struct list_head cb_per_client;
  68         u32 cb_minorversion;
  69         struct rpc_message cb_msg;
  70         const struct rpc_call_ops *cb_ops;
  71         struct work_struct cb_work;
  72         bool cb_done;
  73 };
  74
  75 /*
  76  * A core object that represents a "common" stateid. These are generally
  77  * embedded within the different (more specific) stateid objects and contain
  78  * fields that are of general use to any stateid.
  79  */
  80 struct nfs4_stid {
  81         atomic_t sc_count;
  82 #define NFS4_OPEN_STID 1
  83 #define NFS4_LOCK_STID 2
  84 #define NFS4_DELEG_STID 4
  85 /* For an open stateid kept around *only* to process close replays: */
  86 #define NFS4_CLOSED_STID 8
  87 /* For a deleg stateid kept around only to process free_stateid's: */
  88 #define NFS4_REVOKED_DELEG_STID 16
  89 #define NFS4_CLOSED_DELEG_STID 32
  90         unsigned char sc_type;
  91         stateid_t sc_stateid;
  92         struct nfs4_client *sc_client;
  93         struct nfs4_file *sc_file;
  94         void (*sc_free)(struct nfs4_stid *);
  95 };
  96
  97 /*
  98  * Represents a delegation stateid. The nfs4_client holds references to these
  99  * and they are put when it is being destroyed or when the delegation is
 100  * returned by the client:
 101  *
 102  * o 1 reference as long as a delegation is still in force (taken when it's
 103  *   alloc'd, put when it's returned or revoked)
 104  *
 105  * o 1 reference as long as a recall rpc is in progress (taken when the lease
 106  *   is broken, put when the rpc exits)
 107  *
 108  * o 1 more ephemeral reference for each nfsd thread currently doing something
 109  *   with that delegation without holding the cl_lock
 110  *
 111  * If the server attempts to recall a delegation and the client doesn't do so
 112  * before a timeout, the server may also revoke the delegation. In that case,
 113  * the object will either be destroyed (v4.0) or moved to a per-client list of
 114  * revoked delegations (v4.1+).
 115  *
 116  * This object is a superset of the nfs4_stid.
 117  */
 118 struct nfs4_delegation {
 119         struct nfs4_stid        dl_stid; /* must be first field */
 120         struct list_head        dl_perfile;
 121         struct list_head        dl_perclnt;
 122         struct list_head        dl_recall_lru;  /* delegation recalled */
 123         u32                     dl_type;
 124         time_t                  dl_time;
 125 /* For recall: */
 126         int                     dl_retries;
 127         struct nfsd4_callback   dl_recall;
 128 };
 129
 130 /* client delegation callback info */
 131 struct nfs4_cb_conn {
 132         /* SETCLIENTID info */
 133         struct sockaddr_storage cb_addr;
 134         struct sockaddr_storage cb_saddr;
 135         size_t                  cb_addrlen;
 136         u32                     cb_prog; /* used only in 4.0 case;
 137                                             per-session otherwise */
 138         u32                     cb_ident;       /* minorversion 0 only */
 139         struct svc_xprt         *cb_xprt;       /* minorversion 1 only */
 140 };
 141
 142 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
 143 {
 144         return container_of(s, struct nfs4_delegation, dl_stid);
 145 }
 146
 147 /* Maximum number of slots per session. 160 is useful for long haul TCP */
 148 #define NFSD_MAX_SLOTS_PER_SESSION     160
 149 /* Maximum number of operations per session compound */
 150 #define NFSD_MAX_OPS_PER_COMPOUND       16
 151 /* Maximum  session per slot cache size */
 152 #define NFSD_SLOT_CACHE_SIZE            2048
 153 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
 154 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION       32
 155 #define NFSD_MAX_MEM_PER_SESSION  \
 156                 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
 157
 158 struct nfsd4_slot {
 159         u32     sl_seqid;
 160         __be32  sl_status;
 161         u32     sl_datalen;
 162         u16     sl_opcnt;
 163 #define NFSD4_SLOT_INUSE        (1 << 0)
 164 #define NFSD4_SLOT_CACHETHIS    (1 << 1)
 165 #define NFSD4_SLOT_INITIALIZED  (1 << 2)
 166         u8      sl_flags;
 167         char    sl_data[];
 168 };
 169
 170 struct nfsd4_channel_attrs {
 171         u32             headerpadsz;
 172         u32             maxreq_sz;
 173         u32             maxresp_sz;
 174         u32             maxresp_cached;
 175         u32             maxops;
 176         u32             maxreqs;
 177         u32             nr_rdma_attrs;
 178         u32             rdma_attrs;
 179 };
 180
 181 struct nfsd4_cb_sec {
 182         u32     flavor; /* (u32)(-1) used to mean "no valid flavor" */
 183         kuid_t  uid;
 184         kgid_t  gid;
 185 };
 186
 187 struct nfsd4_create_session {
 188         clientid_t                      clientid;
 189         struct nfs4_sessionid           sessionid;
 190         u32                             seqid;
 191         u32                             flags;
 192         struct nfsd4_channel_attrs      fore_channel;
 193         struct nfsd4_channel_attrs      back_channel;
 194         u32                             callback_prog;
 195         struct nfsd4_cb_sec             cb_sec;
 196 };
 197
 198 struct nfsd4_backchannel_ctl {
 199         u32     bc_cb_program;
 200         struct nfsd4_cb_sec             bc_cb_sec;
 201 };
 202
 203 struct nfsd4_bind_conn_to_session {
 204         struct nfs4_sessionid           sessionid;
 205         u32                             dir;
 206 };
 207
 208 /* The single slot clientid cache structure */
 209 struct nfsd4_clid_slot {
 210         u32                             sl_seqid;
 211         __be32                          sl_status;
 212         struct nfsd4_create_session     sl_cr_ses;
 213 };
 214
 215 struct nfsd4_conn {
 216         struct list_head cn_persession;
 217         struct svc_xprt *cn_xprt;
 218         struct svc_xpt_user cn_xpt_user;
 219         struct nfsd4_session *cn_session;
 220 /* CDFC4_FORE, CDFC4_BACK: */
 221         unsigned char cn_flags;
 222 };
 223
 224 /*
 225  * Representation of a v4.1+ session. These are refcounted in a similar fashion
 226  * to the nfs4_client. References are only taken when the server is actively
 227  * working on the object (primarily during the processing of compounds).
 228  */
 229 struct nfsd4_session {
 230         atomic_t                se_ref;
 231         struct list_head        se_hash;        /* hash by sessionid */
 232         struct list_head        se_perclnt;
 233 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
 234 #define NFS4_SESSION_DEAD       0x010
 235         u32                     se_flags;
 236         struct nfs4_client      *se_client;
 237         struct nfs4_sessionid   se_sessionid;
 238         struct nfsd4_channel_attrs se_fchannel;
 239         struct nfsd4_channel_attrs se_bchannel;
 240         struct nfsd4_cb_sec     se_cb_sec;
 241         struct list_head        se_conns;
 242         u32                     se_cb_prog;
 243         u32                     se_cb_seq_nr;
 244         struct nfsd4_slot       *se_slots[];    /* forward channel slots */
 245 };
 246
 247 /* formatted contents of nfs4_sessionid */
 248 struct nfsd4_sessionid {
 249         clientid_t      clientid;
 250         u32             sequence;
 251         u32             reserved;
 252 };
 253
 254 #define HEXDIR_LEN     33 /* hex version of 16 byte md5 of cl_name plus '\0' */
 255
 256 /*
 257  * struct nfs4_client - one per client.  Clientids live here.
 258  *
 259  * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
 260  * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
 261  * Each nfsd_net_ns object contains a set of these and they are tracked via
 262  * short and long form clientid. They are hashed and searched for under the
 263  * per-nfsd_net client_lock spinlock.
 264  *
 265  * References to it are only held during the processing of compounds, and in
 266  * certain other operations. In their "resting state" they have a refcount of
 267  * 0. If they are not renewed within a lease period, they become eligible for
 268  * destruction by the laundromat.
 269  *
 270  * These objects can also be destroyed prematurely by the fault injection code,
 271  * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
 272  * Care is taken *not* to do this however when the objects have an elevated
 273  * refcount.
 274  *
 275  * o Each nfs4_client is hashed by clientid
 276  *
 277  * o Each nfs4_clients is also hashed by name (the opaque quantity initially
 278  *   sent by the client to identify itself).
 279  *
 280  * o cl_perclient list is used to ensure no dangling stateowner references
 281  *   when we expire the nfs4_client
 282  */
 283 struct nfs4_client {
 284         struct list_head        cl_idhash;      /* hash by cl_clientid.id */
 285         struct rb_node          cl_namenode;    /* link into by-name trees */
 286         struct list_head        *cl_ownerstr_hashtbl;
 287         struct list_head        cl_openowners;
 288         struct idr              cl_stateids;    /* stateid lookup */
 289         struct list_head        cl_delegations;
 290         struct list_head        cl_revoked;     /* unacknowledged, revoked 4.1 state */
 291         struct list_head        cl_lru;         /* tail queue */
 292         struct xdr_netobj       cl_name;        /* id generated by client */
 293         nfs4_verifier           cl_verifier;    /* generated by client */
 294         time_t                  cl_time;        /* time of last lease renewal */
 295         struct sockaddr_storage cl_addr;        /* client ipaddress */
 296         bool                    cl_mach_cred;   /* SP4_MACH_CRED in force */
 297         struct svc_cred         cl_cred;        /* setclientid principal */
 298         clientid_t              cl_clientid;    /* generated by server */
 299         nfs4_verifier           cl_confirm;     /* generated by server */
 300         u32                     cl_minorversion;
 301
 302         /* for v4.0 and v4.1 callbacks: */
 303         struct nfs4_cb_conn     cl_cb_conn;
 304 #define NFSD4_CLIENT_CB_UPDATE          (0)
 305 #define NFSD4_CLIENT_CB_KILL            (1)
 306 #define NFSD4_CLIENT_STABLE             (2)     /* client on stable storage */
 307 #define NFSD4_CLIENT_RECLAIM_COMPLETE   (3)     /* reclaim_complete done */
 308 #define NFSD4_CLIENT_CONFIRMED          (4)     /* client is confirmed */
 309 #define NFSD4_CLIENT_UPCALL_LOCK        (5)     /* upcall serialization */
 310 #define NFSD4_CLIENT_CB_FLAG_MASK       (1 << NFSD4_CLIENT_CB_UPDATE | \
 311                                          1 << NFSD4_CLIENT_CB_KILL)
 312         unsigned long           cl_flags;
 313         struct rpc_cred         *cl_cb_cred;
 314         struct rpc_clnt         *cl_cb_client;
 315         u32                     cl_cb_ident;
 316 #define NFSD4_CB_UP             0
 317 #define NFSD4_CB_UNKNOWN        1
 318 #define NFSD4_CB_DOWN           2
 319 #define NFSD4_CB_FAULT          3
 320         int                     cl_cb_state;
 321         struct nfsd4_callback   cl_cb_null;
 322         struct nfsd4_session    *cl_cb_session;
 323         struct list_head        cl_callbacks; /* list of in-progress callbacks */
 324
 325         /* for all client information that callback code might need: */
 326         spinlock_t              cl_lock;
 327
 328         /* for nfs41 */
 329         struct list_head        cl_sessions;
 330         struct nfsd4_clid_slot  cl_cs_slot;     /* create_session slot */
 331         u32                     cl_exchange_flags;
 332         /* number of rpc's in progress over an associated session: */
 333         atomic_t                cl_refcount;
 334
 335         /* for nfs41 callbacks */
 336         /* We currently support a single back channel with a single slot */
 337         unsigned long           cl_cb_slot_busy;
 338         struct rpc_wait_queue   cl_cb_waitq;    /* backchannel callers may */
 339                                                 /* wait here for slots */
 340         struct net              *net;
 341 };
 342
 343 /* struct nfs4_client_reset
 344  * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
 345  * upon lease reset, or from upcall to state_daemon (to read in state
 346  * from non-volitile storage) upon reboot.
 347  */
 348 struct nfs4_client_reclaim {
 349         struct list_head        cr_strhash;     /* hash by cr_name */
 350         struct nfs4_client      *cr_clp;        /* pointer to associated clp */
 351         char                    cr_recdir[HEXDIR_LEN]; /* recover dir */
 352 };
 353
 354 static inline void
 355 update_stateid(stateid_t *stateid)
 356 {
 357         stateid->si_generation++;
 358         /* Wraparound recommendation from 3530bis-13 9.1.3.2: */
 359         if (stateid->si_generation == 0)
 360                 stateid->si_generation = 1;
 361 }
 362
 363 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
 364  * The OPEN response, typically the largest, requires
 365  *   4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) +  8(verifier) +
 366  *   4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
 367  *   20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
 368  */
 369
 370 #define NFSD4_REPLAY_ISIZE       112
 371
 372 /*
 373  * Replay buffer, where the result of the last seqid-mutating operation
 374  * is cached.
 375  */
 376 struct nfs4_replay {
 377         __be32                  rp_status;
 378         unsigned int            rp_buflen;
 379         char                    *rp_buf;
 380         struct knfsd_fh         rp_openfh;
 381         struct mutex            rp_mutex;
 382         char                    rp_ibuf[NFSD4_REPLAY_ISIZE];
 383 };
 384
 385 struct nfs4_stateowner;
 386
 387 struct nfs4_stateowner_operations {
 388         void (*so_unhash)(struct nfs4_stateowner *);
 389         void (*so_free)(struct nfs4_stateowner *);
 390 };
 391
 392 /*
 393  * A core object that represents either an open or lock owner. The object and
 394  * lock owner objects have one of these embedded within them. Refcounts and
 395  * other fields common to both owner types are contained within these
 396  * structures.
 397  */
 398 struct nfs4_stateowner {
 399         struct list_head                        so_strhash;
 400         struct list_head                        so_stateids;
 401         struct nfs4_client                      *so_client;
 402         const struct nfs4_stateowner_operations *so_ops;
 403         /* after increment in nfsd4_bump_seqid, represents the next
 404          * sequence id expected from the client: */
 405         atomic_t                                so_count;
 406         u32                                     so_seqid;
 407         struct xdr_netobj                       so_owner; /* open owner name */
 408         struct nfs4_replay                      so_replay;
 409         bool                                    so_is_open_owner;
 410 };
 411
 412 /*
 413  * When a file is opened, the client provides an open state owner opaque string
 414  * that indicates the "owner" of that open. These objects are refcounted.
 415  * References to it are held by each open state associated with it. This object
 416  * is a superset of the nfs4_stateowner struct.
 417  */
 418 struct nfs4_openowner {
 419         struct nfs4_stateowner  oo_owner; /* must be first field */
 420         struct list_head        oo_perclient;
 421         /*
 422          * We keep around openowners a little while after last close,
 423          * which saves clients from having to confirm, and allows us to
 424          * handle close replays if they come soon enough.  The close_lru
 425          * is a list of such openowners, to be reaped by the laundromat
 426          * thread eventually if they remain unused:
 427          */
 428         struct list_head        oo_close_lru;
 429         struct nfs4_ol_stateid *oo_last_closed_stid;
 430         time_t                  oo_time; /* time of placement on so_close_lru */
 431 #define NFS4_OO_CONFIRMED   1
 432         unsigned char           oo_flags;
 433 };
 434
 435 /*
 436  * Represents a generic "lockowner". Similar to an openowner. References to it
 437  * are held by the lock stateids that are created on its behalf. This object is
 438  * a superset of the nfs4_stateowner struct (or would be if it needed any extra
 439  * fields).
 440  */
 441 struct nfs4_lockowner {
 442         struct nfs4_stateowner  lo_owner; /* must be first element */
 443 };
 444
 445 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
 446 {
 447         return container_of(so, struct nfs4_openowner, oo_owner);
 448 }
 449
 450 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 451 {
 452         return container_of(so, struct nfs4_lockowner, lo_owner);
 453 }
 454
 455 /*
 456  * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
 457  *
 458  * These objects are global. nfsd only keeps one instance of a nfs4_file per
 459  * inode (though it may keep multiple file descriptors open per inode). These
 460  * are tracked in the file_hashtbl which is protected by the state_lock
 461  * spinlock.
 462  */
 463 struct nfs4_file {
 464         atomic_t                fi_ref;
 465         spinlock_t              fi_lock;
 466         struct hlist_node       fi_hash;    /* hash by "struct inode *" */
 467         struct list_head        fi_stateids;
 468         struct list_head        fi_delegations;
 469         /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
 470         struct file *           fi_fds[3];
 471         /*
 472          * Each open or lock stateid contributes 0-4 to the counts
 473          * below depending on which bits are set in st_access_bitmap:
 474          *     1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
 475          *   + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
 476          *   + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
 477          */
 478         atomic_t                fi_access[2];
 479         u32                     fi_share_deny;
 480         struct file             *fi_deleg_file;
 481         struct file_lock        *fi_lease;
 482         atomic_t                fi_delegees;
 483         struct knfsd_fh         fi_fhandle;
 484         bool                    fi_had_conflict;
 485 };
 486
 487 /*
 488  * A generic struct representing either a open or lock stateid. The nfs4_client
 489  * holds a reference to each of these objects, and they in turn hold a
 490  * reference to their respective stateowners. The client's reference is
 491  * released in response to a close or unlock (depending on whether it's an open
 492  * or lock stateid) or when the client is being destroyed.
 493  *
 494  * In the case of v4.0 open stateids, these objects are preserved for a little
 495  * while after close in order to handle CLOSE replays. Those are eventually
 496  * reclaimed via a LRU scheme by the laundromat.
 497  *
 498  * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
 499  * Better suggestions welcome.
 500  */
 501 struct nfs4_ol_stateid {
 502         struct nfs4_stid    st_stid; /* must be first field */
 503         struct list_head              st_perfile;
 504         struct list_head              st_perstateowner;
 505         struct list_head              st_locks;
 506         struct nfs4_stateowner      * st_stateowner;
 507         unsigned char                 st_access_bmap;
 508         unsigned char                 st_deny_bmap;
 509         struct nfs4_ol_stateid         * st_openstp;
 510 };
 511
 512 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
 513 {
 514         return container_of(s, struct nfs4_ol_stateid, st_stid);
 515 }
 516
 517 /* flags for preprocess_seqid_op() */
 518 #define RD_STATE                0x00000010
 519 #define WR_STATE                0x00000020
 520
 521 struct nfsd4_compound_state;
 522 struct nfsd_net;
 523
 524 extern __be32 nfs4_preprocess_stateid_op(struct net *net,
 525                 struct nfsd4_compound_state *cstate,
 526                 stateid_t *stateid, int flags, struct file **filp);
 527 void nfs4_put_stid(struct nfs4_stid *s);
 528 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
 529 extern void nfs4_release_reclaim(struct nfsd_net *);
 530 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
 531                                                         struct nfsd_net *nn);
 532 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
 533                 struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
 534 extern int set_callback_cred(void);
 535 void nfsd4_run_cb_null(struct work_struct *w);
 536 void nfsd4_run_cb_recall(struct work_struct *w);
 537 extern void nfsd4_probe_callback(struct nfs4_client *clp);
 538 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
 539 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
 540 extern void nfsd4_cb_recall(struct nfs4_delegation *dp);
 541 extern int nfsd4_create_callback_queue(void);
 542 extern void nfsd4_destroy_callback_queue(void);
 543 extern void nfsd4_shutdown_callback(struct nfs4_client *);
 544 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
 545 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
 546                                                         struct nfsd_net *nn);
 547 extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
 548
 549 /* grace period management */
 550 void nfsd4_end_grace(struct nfsd_net *nn);
 551
 552 /* nfs4recover operations */
 553 extern int nfsd4_client_tracking_init(struct net *net);
 554 extern void nfsd4_client_tracking_exit(struct net *net);
 555 extern void nfsd4_client_record_create(struct nfs4_client *clp);
 556 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
 557 extern int nfsd4_client_record_check(struct nfs4_client *clp);
 558 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
 559
 560 /* nfs fault injection functions */
 561 #ifdef CONFIG_NFSD_FAULT_INJECTION
 562 int nfsd_fault_inject_init(void);
 563 void nfsd_fault_inject_cleanup(void);
 564
 565 u64 nfsd_inject_print_clients(void);
 566 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t);
 567 u64 nfsd_inject_forget_clients(u64);
 568
 569 u64 nfsd_inject_print_locks(void);
 570 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t);
 571 u64 nfsd_inject_forget_locks(u64);
 572
 573 u64 nfsd_inject_print_openowners(void);
 574 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t);
 575 u64 nfsd_inject_forget_openowners(u64);
 576
 577 u64 nfsd_inject_print_delegations(void);
 578 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t);
 579 u64 nfsd_inject_forget_delegations(u64);
 580 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t);
 581 u64 nfsd_inject_recall_delegations(u64);
 582 #else /* CONFIG_NFSD_FAULT_INJECTION */
 583 static inline int nfsd_fault_inject_init(void) { return 0; }
 584 static inline void nfsd_fault_inject_cleanup(void) {}
 585 #endif /* CONFIG_NFSD_FAULT_INJECTION */
 586
 587 #endif   /* NFSD4_STATE_H */