fs/nfs/nfs4_fs.h

   1 /*
   2  * linux/fs/nfs/nfs4_fs.h
   3  *
   4  * Copyright (C) 2005 Trond Myklebust
   5  *
   6  * NFSv4-specific filesystem definitions and declarations
   7  */
   8
   9 #ifndef __LINUX_FS_NFS_NFS4_FS_H
  10 #define __LINUX_FS_NFS_NFS4_FS_H
  11
  12 #if defined(CONFIG_NFS_V4_2)
  13 #define NFS4_MAX_MINOR_VERSION 2
  14 #elif defined(CONFIG_NFS_V4_1)
  15 #define NFS4_MAX_MINOR_VERSION 1
  16 #else
  17 #define NFS4_MAX_MINOR_VERSION 0
  18 #endif
  19
  20 #if IS_ENABLED(CONFIG_NFS_V4)
  21
  22 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  23
  24 #include <linux/seqlock.h>
  25
  26 struct idmap;
  27
  28 enum nfs4_client_state {
  29         NFS4CLNT_MANAGER_RUNNING  = 0,
  30         NFS4CLNT_CHECK_LEASE,
  31         NFS4CLNT_LEASE_EXPIRED,
  32         NFS4CLNT_RECLAIM_REBOOT,
  33         NFS4CLNT_RECLAIM_NOGRACE,
  34         NFS4CLNT_DELEGRETURN,
  35         NFS4CLNT_SESSION_RESET,
  36         NFS4CLNT_LEASE_CONFIRM,
  37         NFS4CLNT_SERVER_SCOPE_MISMATCH,
  38         NFS4CLNT_PURGE_STATE,
  39         NFS4CLNT_BIND_CONN_TO_SESSION,
  40         NFS4CLNT_MOVED,
  41         NFS4CLNT_LEASE_MOVED,
  42 };
  43
  44 #define NFS4_RENEW_TIMEOUT              0x01
  45 #define NFS4_RENEW_DELEGATION_CB        0x02
  46
  47 struct nfs_seqid_counter;
  48 struct nfs4_minor_version_ops {
  49         u32     minor_version;
  50         unsigned init_caps;
  51
  52         int     (*init_client)(struct nfs_client *);
  53         void    (*shutdown_client)(struct nfs_client *);
  54         bool    (*match_stateid)(const nfs4_stateid *,
  55                         const nfs4_stateid *);
  56         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  57                         struct nfs_fsinfo *);
  58         void    (*free_lock_state)(struct nfs_server *,
  59                         struct nfs4_lock_state *);
  60         struct nfs_seqid *
  61                 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  62         const struct rpc_call_ops *call_sync_ops;
  63         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  64         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  65         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  66         const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  67 };
  68
  69 #define NFS_SEQID_CONFIRMED 1
  70 struct nfs_seqid_counter {
  71         ktime_t create_time;
  72         int owner_id;
  73         int flags;
  74         u32 counter;
  75         spinlock_t lock;                /* Protects the list */
  76         struct list_head list;          /* Defines sequence of RPC calls */
  77         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  78 };
  79
  80 struct nfs_seqid {
  81         struct nfs_seqid_counter *sequence;
  82         struct list_head list;
  83         struct rpc_task *task;
  84 };
  85
  86 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  87 {
  88         if (seqid_mutating_err(-status))
  89                 seqid->flags |= NFS_SEQID_CONFIRMED;
  90 }
  91
  92 /*
  93  * NFS4 state_owners and lock_owners are simply labels for ordered
  94  * sequences of RPC calls. Their sole purpose is to provide once-only
  95  * semantics by allowing the server to identify replayed requests.
  96  */
  97 struct nfs4_state_owner {
  98         struct nfs_server    *so_server;
  99         struct list_head     so_lru;
 100         unsigned long        so_expires;
 101         struct rb_node       so_server_node;
 102
 103         struct rpc_cred      *so_cred;   /* Associated cred */
 104
 105         spinlock_t           so_lock;
 106         atomic_t             so_count;
 107         unsigned long        so_flags;
 108         struct list_head     so_states;
 109         struct nfs_seqid_counter so_seqid;
 110         seqcount_t           so_reclaim_seqcount;
 111         struct mutex         so_delegreturn_mutex;
 112 };
 113
 114 enum {
 115         NFS_OWNER_RECLAIM_REBOOT,
 116         NFS_OWNER_RECLAIM_NOGRACE
 117 };
 118
 119 #define NFS_LOCK_NEW            0
 120 #define NFS_LOCK_RECLAIM        1
 121 #define NFS_LOCK_EXPIRED        2
 122
 123 /*
 124  * struct nfs4_state maintains the client-side state for a given
 125  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 126  *
 127  * OPEN:
 128  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 129  * we need to know how many files are open for reading or writing on a
 130  * given inode. This information too is stored here.
 131  *
 132  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 133  */
 134
 135 struct nfs4_lock_state {
 136         struct list_head        ls_locks;       /* Other lock stateids */
 137         struct nfs4_state *     ls_state;       /* Pointer to open state */
 138 #define NFS_LOCK_INITIALIZED 0
 139 #define NFS_LOCK_LOST        1
 140         unsigned long           ls_flags;
 141         struct nfs_seqid_counter        ls_seqid;
 142         nfs4_stateid            ls_stateid;
 143         atomic_t                ls_count;
 144         fl_owner_t              ls_owner;
 145 };
 146
 147 /* bits for nfs4_state->flags */
 148 enum {
 149         LK_STATE_IN_USE,
 150         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 151         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 152         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 153         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 154         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 155         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 156         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 157         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 158         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 159 };
 160
 161 struct nfs4_state {
 162         struct list_head open_states;   /* List of states for the same state_owner */
 163         struct list_head inode_states;  /* List of states for the same inode */
 164         struct list_head lock_states;   /* List of subservient lock stateids */
 165
 166         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 167         struct inode *inode;            /* Pointer to the inode */
 168
 169         unsigned long flags;            /* Do we hold any locks? */
 170         spinlock_t state_lock;          /* Protects the lock_states list */
 171
 172         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 173         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 174         nfs4_stateid open_stateid;      /* OPEN stateid */
 175
 176         /* The following 3 fields are protected by owner->so_lock */
 177         unsigned int n_rdonly;          /* Number of read-only references */
 178         unsigned int n_wronly;          /* Number of write-only references */
 179         unsigned int n_rdwr;            /* Number of read/write references */
 180         fmode_t state;                  /* State on the server (R,W, or RW) */
 181         atomic_t count;
 182 };
 183
 184
 185 struct nfs4_exception {
 186         struct nfs4_state *state;
 187         struct inode *inode;
 188         nfs4_stateid *stateid;
 189         long timeout;
 190         unsigned char delay : 1,
 191                       recovering : 1,
 192                       retry : 1;
 193 };
 194
 195 struct nfs4_state_recovery_ops {
 196         int owner_flag_bit;
 197         int state_flag_bit;
 198         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 199         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 200         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 201         int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
 202         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 203                 struct rpc_cred *);
 204 };
 205
 206 struct nfs4_state_maintenance_ops {
 207         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 208         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 209         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 210 };
 211
 212 struct nfs4_mig_recovery_ops {
 213         int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 214                 struct page *, struct rpc_cred *);
 215         int (*fsid_present)(struct inode *, struct rpc_cred *);
 216 };
 217
 218 extern const struct dentry_operations nfs4_dentry_operations;
 219
 220 /* dir.c */
 221 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 222                     unsigned, umode_t, int *);
 223
 224 /* super.c */
 225 extern struct file_system_type nfs4_fs_type;
 226
 227 /* nfs4namespace.c */
 228 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 229                                          const struct qstr *);
 230 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 231                                struct nfs_fh *, struct nfs_fattr *);
 232 int nfs4_replace_transport(struct nfs_server *server,
 233                                 const struct nfs4_fs_locations *locations);
 234
 235 /* nfs4proc.c */
 236 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 237 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 238                           struct rpc_message *, struct nfs4_sequence_args *,
 239                           struct nfs4_sequence_res *, int);
 240 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int);
 241 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 242 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 243 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 244 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 245 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 246 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 247 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 248 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 249 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 250 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 251 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 252                                   struct nfs4_fs_locations *, struct page *);
 253 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 254                 struct page *page, struct rpc_cred *);
 255 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
 256 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
 257                             struct nfs_fh *, struct nfs_fattr *);
 258 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 259 extern const struct xattr_handler *nfs4_xattr_handlers[];
 260 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 261                 const struct nfs_open_context *ctx,
 262                 const struct nfs_lock_context *l_ctx,
 263                 fmode_t fmode);
 264
 265 #if defined(CONFIG_NFS_V4_1)
 266 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 267 {
 268         return server->nfs_client->cl_session;
 269 }
 270
 271 extern int nfs41_setup_sequence(struct nfs4_session *session,
 272                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 273                 struct rpc_task *task);
 274 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 275 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 276 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 277 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 278                 struct nfs_fsinfo *fsinfo);
 279 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 280                                   bool sync);
 281
 282 static inline bool
 283 is_ds_only_client(struct nfs_client *clp)
 284 {
 285         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 286                 EXCHGID4_FLAG_USE_PNFS_DS;
 287 }
 288
 289 static inline bool
 290 is_ds_client(struct nfs_client *clp)
 291 {
 292         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 293 }
 294
 295 static inline bool
 296 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 297                     struct rpc_clnt **clntp, struct rpc_message *msg)
 298 {
 299         struct rpc_cred *newcred = NULL;
 300         rpc_authflavor_t flavor;
 301
 302         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 303                 spin_lock(&clp->cl_lock);
 304                 if (clp->cl_machine_cred != NULL)
 305                         /* don't call get_rpccred on the machine cred -
 306                          * a reference will be held for life of clp */
 307                         newcred = clp->cl_machine_cred;
 308                 spin_unlock(&clp->cl_lock);
 309                 msg->rpc_cred = newcred;
 310
 311                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 312                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 313                              flavor != RPC_AUTH_GSS_KRB5P);
 314                 *clntp = clp->cl_rpcclient;
 315
 316                 return true;
 317         }
 318         return false;
 319 }
 320
 321 /*
 322  * Function responsible for determining if an rpc_message should use the
 323  * machine cred under SP4_MACH_CRED and if so switching the credential and
 324  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 325  * Should be called before rpc_call_sync/rpc_call_async.
 326  */
 327 static inline void
 328 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 329                    struct rpc_clnt **clntp, struct rpc_message *msg)
 330 {
 331         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 332 }
 333
 334 /*
 335  * Special wrapper to nfs4_state_protect for write.
 336  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 337  * that use machine cred use NFS_FILE_SYNC.
 338  */
 339 static inline void
 340 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 341                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 342 {
 343         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 344             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 345                 hdr->args.stable = NFS_FILE_SYNC;
 346 }
 347 #else /* CONFIG_NFS_v4_1 */
 348 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 349 {
 350         return NULL;
 351 }
 352
 353 static inline bool
 354 is_ds_only_client(struct nfs_client *clp)
 355 {
 356         return false;
 357 }
 358
 359 static inline bool
 360 is_ds_client(struct nfs_client *clp)
 361 {
 362         return false;
 363 }
 364
 365 static inline void
 366 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 367                    struct rpc_clnt **clntp, struct rpc_message *msg)
 368 {
 369 }
 370
 371 static inline void
 372 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 373                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 374 {
 375 }
 376 #endif /* CONFIG_NFS_V4_1 */
 377
 378 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 379
 380 extern const u32 nfs4_fattr_bitmap[3];
 381 extern const u32 nfs4_statfs_bitmap[3];
 382 extern const u32 nfs4_pathconf_bitmap[3];
 383 extern const u32 nfs4_fsinfo_bitmap[3];
 384 extern const u32 nfs4_fs_locations_bitmap[3];
 385
 386 void nfs40_shutdown_client(struct nfs_client *);
 387 void nfs41_shutdown_client(struct nfs_client *);
 388 int nfs40_init_client(struct nfs_client *);
 389 int nfs41_init_client(struct nfs_client *);
 390 void nfs4_free_client(struct nfs_client *);
 391
 392 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 393
 394 /* nfs4renewd.c */
 395 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 396 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 397 extern void nfs4_kill_renewd(struct nfs_client *);
 398 extern void nfs4_renew_state(struct work_struct *);
 399 extern void nfs4_set_lease_period(struct nfs_client *clp,
 400                 unsigned long lease,
 401                 unsigned long lastrenewed);
 402
 403
 404 /* nfs4state.c */
 405 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
 406 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 407 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 408 int nfs4_discover_server_trunking(struct nfs_client *clp,
 409                         struct nfs_client **);
 410 int nfs40_discover_server_trunking(struct nfs_client *clp,
 411                         struct nfs_client **, struct rpc_cred *);
 412 #if defined(CONFIG_NFS_V4_1)
 413 int nfs41_discover_server_trunking(struct nfs_client *clp,
 414                         struct nfs_client **, struct rpc_cred *);
 415 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 416 extern void nfs41_notify_server(struct nfs_client *);
 417 #else
 418 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 419 {
 420 }
 421 #endif /* CONFIG_NFS_V4_1 */
 422
 423 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 424 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 425 extern void nfs4_purge_state_owners(struct nfs_server *);
 426 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 427 extern void nfs4_put_open_state(struct nfs4_state *);
 428 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 429 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 430 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 431 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 432                 const nfs4_stateid *stateid);
 433 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 434 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 435 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 436 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 437 extern void nfs4_schedule_state_manager(struct nfs_client *);
 438 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 439 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 440 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 441 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 442 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 443 extern void nfs41_handle_server_scope(struct nfs_client *,
 444                                       struct nfs41_server_scope **);
 445 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 446 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 447 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 448                 const struct nfs_lockowner *, nfs4_stateid *,
 449                 struct rpc_cred **);
 450
 451 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 452 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 453 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 454 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 455 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 456 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 457 extern int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 458                                 struct nfs4_sequence_args *args,
 459                                 struct nfs4_sequence_res *res,
 460                                 struct rpc_task *task);
 461 extern int nfs4_sequence_done(struct rpc_task *task,
 462                               struct nfs4_sequence_res *res);
 463
 464 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 465
 466 extern const nfs4_stateid zero_stateid;
 467
 468 /* nfs4super.c */
 469 struct nfs_mount_info;
 470 extern struct nfs_subversion nfs_v4;
 471 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 472 extern bool nfs4_disable_idmapping;
 473 extern unsigned short max_session_slots;
 474 extern unsigned short send_implementation_id;
 475 extern bool recover_lost_locks;
 476
 477 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 478 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 479
 480 /* nfs4sysctl.c */
 481 #ifdef CONFIG_SYSCTL
 482 int nfs4_register_sysctl(void);
 483 void nfs4_unregister_sysctl(void);
 484 #else
 485 static inline int nfs4_register_sysctl(void)
 486 {
 487         return 0;
 488 }
 489
 490 static inline void nfs4_unregister_sysctl(void)
 491 {
 492 }
 493 #endif
 494
 495 /* nfs4xdr.c */
 496 extern struct rpc_procinfo nfs4_procedures[];
 497
 498 struct nfs4_mount_data;
 499
 500 /* callback_xdr.c */
 501 extern struct svc_version nfs4_callback_version1;
 502 extern struct svc_version nfs4_callback_version4;
 503
 504 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 505 {
 506         memcpy(dst->data, src->data, sizeof(dst->data));
 507         dst->type = src->type;
 508 }
 509
 510 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 511 {
 512         if (dst->type != src->type)
 513                 return false;
 514         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 515 }
 516
 517 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 518 {
 519         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 520 }
 521
 522 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 523 {
 524         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 525 }
 526
 527 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 528 {
 529         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 530 }
 531
 532 #else
 533
 534 #define nfs4_close_state(a, b) do { } while (0)
 535 #define nfs4_close_sync(a, b) do { } while (0)
 536 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 537 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 538
 539 #endif /* CONFIG_NFS_V4 */
 540 #endif /* __LINUX_FS_NFS_NFS4_FS.H */