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         long timeout;
 189         unsigned char delay : 1,
 190                       recovering : 1,
 191                       retry : 1;
 192 };
 193
 194 struct nfs4_state_recovery_ops {
 195         int owner_flag_bit;
 196         int state_flag_bit;
 197         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 198         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 199         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 200         int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
 201         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 202                 struct rpc_cred *);
 203 };
 204
 205 struct nfs4_state_maintenance_ops {
 206         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 207         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 208         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 209 };
 210
 211 struct nfs4_mig_recovery_ops {
 212         int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 213                 struct page *, struct rpc_cred *);
 214         int (*fsid_present)(struct inode *, struct rpc_cred *);
 215 };
 216
 217 extern const struct dentry_operations nfs4_dentry_operations;
 218
 219 /* dir.c */
 220 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 221                     unsigned, umode_t, int *);
 222
 223 /* super.c */
 224 extern struct file_system_type nfs4_fs_type;
 225
 226 /* nfs4namespace.c */
 227 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, struct qstr *);
 228 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 229                                struct nfs_fh *, struct nfs_fattr *);
 230 int nfs4_replace_transport(struct nfs_server *server,
 231                                 const struct nfs4_fs_locations *locations);
 232
 233 /* nfs4proc.c */
 234 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 235 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 236                           struct rpc_message *, struct nfs4_sequence_args *,
 237                           struct nfs4_sequence_res *, int);
 238 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int);
 239 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 240 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 241 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 242 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 243 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 244 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 245 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 246 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 247 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 248 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 249 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 250                                   struct nfs4_fs_locations *, struct page *);
 251 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 252                 struct page *page, struct rpc_cred *);
 253 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
 254 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
 255                             struct nfs_fh *, struct nfs_fattr *);
 256 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 257 extern const struct xattr_handler *nfs4_xattr_handlers[];
 258 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 259                 const struct nfs_open_context *ctx,
 260                 const struct nfs_lock_context *l_ctx,
 261                 fmode_t fmode);
 262
 263 #if defined(CONFIG_NFS_V4_1)
 264 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 265 {
 266         return server->nfs_client->cl_session;
 267 }
 268
 269 extern int nfs41_setup_sequence(struct nfs4_session *session,
 270                 struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 271                 struct rpc_task *task);
 272 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 273 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 274 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 275 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 276                 struct nfs_fsinfo *fsinfo);
 277 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 278                                   bool sync);
 279
 280 static inline bool
 281 is_ds_only_client(struct nfs_client *clp)
 282 {
 283         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 284                 EXCHGID4_FLAG_USE_PNFS_DS;
 285 }
 286
 287 static inline bool
 288 is_ds_client(struct nfs_client *clp)
 289 {
 290         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 291 }
 292
 293 static inline bool
 294 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 295                     struct rpc_clnt **clntp, struct rpc_message *msg)
 296 {
 297         struct rpc_cred *newcred = NULL;
 298         rpc_authflavor_t flavor;
 299
 300         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 301                 spin_lock(&clp->cl_lock);
 302                 if (clp->cl_machine_cred != NULL)
 303                         /* don't call get_rpccred on the machine cred -
 304                          * a reference will be held for life of clp */
 305                         newcred = clp->cl_machine_cred;
 306                 spin_unlock(&clp->cl_lock);
 307                 msg->rpc_cred = newcred;
 308
 309                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 310                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 311                              flavor != RPC_AUTH_GSS_KRB5P);
 312                 *clntp = clp->cl_rpcclient;
 313
 314                 return true;
 315         }
 316         return false;
 317 }
 318
 319 /*
 320  * Function responsible for determining if an rpc_message should use the
 321  * machine cred under SP4_MACH_CRED and if so switching the credential and
 322  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 323  * Should be called before rpc_call_sync/rpc_call_async.
 324  */
 325 static inline void
 326 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 327                    struct rpc_clnt **clntp, struct rpc_message *msg)
 328 {
 329         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 330 }
 331
 332 /*
 333  * Special wrapper to nfs4_state_protect for write.
 334  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 335  * that use machine cred use NFS_FILE_SYNC.
 336  */
 337 static inline void
 338 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 339                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 340 {
 341         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 342             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 343                 hdr->args.stable = NFS_FILE_SYNC;
 344 }
 345 #else /* CONFIG_NFS_v4_1 */
 346 static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 347 {
 348         return NULL;
 349 }
 350
 351 static inline bool
 352 is_ds_only_client(struct nfs_client *clp)
 353 {
 354         return false;
 355 }
 356
 357 static inline bool
 358 is_ds_client(struct nfs_client *clp)
 359 {
 360         return false;
 361 }
 362
 363 static inline void
 364 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 365                    struct rpc_clnt **clntp, struct rpc_message *msg)
 366 {
 367 }
 368
 369 static inline void
 370 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 371                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 372 {
 373 }
 374 #endif /* CONFIG_NFS_V4_1 */
 375
 376 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 377
 378 extern const u32 nfs4_fattr_bitmap[3];
 379 extern const u32 nfs4_statfs_bitmap[3];
 380 extern const u32 nfs4_pathconf_bitmap[3];
 381 extern const u32 nfs4_fsinfo_bitmap[3];
 382 extern const u32 nfs4_fs_locations_bitmap[3];
 383
 384 void nfs40_shutdown_client(struct nfs_client *);
 385 void nfs41_shutdown_client(struct nfs_client *);
 386 int nfs40_init_client(struct nfs_client *);
 387 int nfs41_init_client(struct nfs_client *);
 388 void nfs4_free_client(struct nfs_client *);
 389
 390 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 391
 392 /* nfs4renewd.c */
 393 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 394 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 395 extern void nfs4_kill_renewd(struct nfs_client *);
 396 extern void nfs4_renew_state(struct work_struct *);
 397
 398 /* nfs4state.c */
 399 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
 400 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 401 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 402 int nfs4_discover_server_trunking(struct nfs_client *clp,
 403                         struct nfs_client **);
 404 int nfs40_discover_server_trunking(struct nfs_client *clp,
 405                         struct nfs_client **, struct rpc_cred *);
 406 #if defined(CONFIG_NFS_V4_1)
 407 int nfs41_discover_server_trunking(struct nfs_client *clp,
 408                         struct nfs_client **, struct rpc_cred *);
 409 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 410 extern void nfs41_notify_server(struct nfs_client *);
 411 #else
 412 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 413 {
 414 }
 415 #endif /* CONFIG_NFS_V4_1 */
 416
 417 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 418 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 419 extern void nfs4_purge_state_owners(struct nfs_server *);
 420 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 421 extern void nfs4_put_open_state(struct nfs4_state *);
 422 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 423 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 424 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 425 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 426                 const nfs4_stateid *stateid);
 427 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 428 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 429 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 430 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 431 extern void nfs4_schedule_state_manager(struct nfs_client *);
 432 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 433 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 434 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 435 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 436 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 437 extern void nfs41_handle_server_scope(struct nfs_client *,
 438                                       struct nfs41_server_scope **);
 439 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 440 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 441 extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
 442                 fmode_t, const struct nfs_lockowner *);
 443
 444 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 445 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 446 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 447 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 448 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 449 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 450 extern int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 451                                 struct nfs4_sequence_args *args,
 452                                 struct nfs4_sequence_res *res,
 453                                 struct rpc_task *task);
 454 extern int nfs4_sequence_done(struct rpc_task *task,
 455                               struct nfs4_sequence_res *res);
 456
 457 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 458
 459 extern const nfs4_stateid zero_stateid;
 460
 461 /* nfs4super.c */
 462 struct nfs_mount_info;
 463 extern struct nfs_subversion nfs_v4;
 464 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 465 extern bool nfs4_disable_idmapping;
 466 extern unsigned short max_session_slots;
 467 extern unsigned short send_implementation_id;
 468 extern bool recover_lost_locks;
 469
 470 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 471 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 472
 473 /* nfs4sysctl.c */
 474 #ifdef CONFIG_SYSCTL
 475 int nfs4_register_sysctl(void);
 476 void nfs4_unregister_sysctl(void);
 477 #else
 478 static inline int nfs4_register_sysctl(void)
 479 {
 480         return 0;
 481 }
 482
 483 static inline void nfs4_unregister_sysctl(void)
 484 {
 485 }
 486 #endif
 487
 488 /* nfs4xdr.c */
 489 extern struct rpc_procinfo nfs4_procedures[];
 490
 491 struct nfs4_mount_data;
 492
 493 /* callback_xdr.c */
 494 extern struct svc_version nfs4_callback_version1;
 495 extern struct svc_version nfs4_callback_version4;
 496
 497 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 498 {
 499         memcpy(dst, src, sizeof(*dst));
 500 }
 501
 502 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 503 {
 504         return memcmp(dst, src, sizeof(*dst)) == 0;
 505 }
 506
 507 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 508 {
 509         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 510 }
 511
 512 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 513 {
 514         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 515 }
 516
 517 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 518 {
 519         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 520 }
 521
 522 #else
 523
 524 #define nfs4_close_state(a, b) do { } while (0)
 525 #define nfs4_close_sync(a, b) do { } while (0)
 526 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 527 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 528
 529 #endif /* CONFIG_NFS_V4 */
 530 #endif /* __LINUX_FS_NFS_NFS4_FS.H */