LXR linux/fs/nfs/nfs4

   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
  26struct idmap;
  27
  28enum 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
  47struct nfs_seqid_counter;
  48struct 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
  70struct 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
  80struct nfs_seqid {
  81        struct nfs_seqid_counter *sequence;
  82        struct list_head list;
  83        struct rpc_task *task;
  84};
  85
  86static 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 */
  97struct 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
 114enum {
 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
 135struct 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 */
 148enum {
 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
 161struct 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
 185struct 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
 194struct 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
 205struct 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
 211struct 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
 217extern const struct dentry_operations nfs4_dentry_operations;
 218
 219/* dir.c */
 220int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 221                    unsigned, umode_t, int *);
 222
 223/* super.c */
 224extern struct file_system_type nfs4_fs_type;
 225
 226/* nfs4namespace.c */
 227struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, struct qstr *);
 228struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 229                               struct nfs_fh *, struct nfs_fattr *);
 230int nfs4_replace_transport(struct nfs_server *server,
 231                                const struct nfs4_fs_locations *locations);
 232
 233/* nfs4proc.c */
 234extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 235extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 236                          struct rpc_message *, struct nfs4_sequence_args *,
 237                          struct nfs4_sequence_res *, int);
 238extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int);
 239extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 240extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 241extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 242extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 243extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 244extern int nfs4_destroy_clientid(struct nfs_client *clp);
 245extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 246extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 247extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 248extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 249extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 250                                  struct nfs4_fs_locations *, struct page *);
 251extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 252                struct page *page, struct rpc_cred *);
 253extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
 254extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
 255                            struct nfs_fh *, struct nfs_fattr *);
 256extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 257extern const struct xattr_handler *nfs4_xattr_handlers[];
 258extern 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)
 264static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 265{
 266        return server->nfs_client->cl_session;
 267}
 268
 269extern int nfs41_setup_sequence(struct nfs4_session *session,
 270                struct nfs4_sequence_args *args, struct nfs4_sequence_res *res,
 271                struct rpc_task *task);
 272extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 273extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 274extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 275extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 276                struct nfs_fsinfo *fsinfo);
 277extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 278                                  bool sync);
 279
 280static inline bool
 281is_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
 287static inline bool
 288is_ds_client(struct nfs_client *clp)
 289{
 290        return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 291}
 292
 293static 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 */
 325static inline void
 326nfs4_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 */
 337static inline void
 338nfs4_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 */
 346static inline struct nfs4_session *nfs4_get_session(const struct nfs_server *server)
 347{
 348        return NULL;
 349}
 350
 351static inline bool
 352is_ds_only_client(struct nfs_client *clp)
 353{
 354        return false;
 355}
 356
 357static inline bool
 358is_ds_client(struct nfs_client *clp)
 359{
 360        return false;
 361}
 362
 363static inline void
 364nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 365                   struct rpc_clnt **clntp, struct rpc_message *msg)
 366{
 367}
 368
 369static inline void
 370nfs4_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
 376extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 377
 378extern const u32 nfs4_fattr_bitmap[3];
 379extern const u32 nfs4_statfs_bitmap[3];
 380extern const u32 nfs4_pathconf_bitmap[3];
 381extern const u32 nfs4_fsinfo_bitmap[3];
 382extern const u32 nfs4_fs_locations_bitmap[3];
 383
 384void nfs40_shutdown_client(struct nfs_client *);
 385void nfs41_shutdown_client(struct nfs_client *);
 386int nfs40_init_client(struct nfs_client *);
 387int nfs41_init_client(struct nfs_client *);
 388void nfs4_free_client(struct nfs_client *);
 389
 390struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 391
 392/* nfs4renewd.c */
 393extern void nfs4_schedule_state_renewal(struct nfs_client *);
 394extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 395extern void nfs4_kill_renewd(struct nfs_client *);
 396extern void nfs4_renew_state(struct work_struct *);
 397
 398/* nfs4state.c */
 399struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
 400struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 401struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 402int nfs4_discover_server_trunking(struct nfs_client *clp,
 403                        struct nfs_client **);
 404int nfs40_discover_server_trunking(struct nfs_client *clp,
 405                        struct nfs_client **, struct rpc_cred *);
 406#if defined(CONFIG_NFS_V4_1)
 407int nfs41_discover_server_trunking(struct nfs_client *clp,
 408                        struct nfs_client **, struct rpc_cred *);
 409extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 410extern void nfs41_notify_server(struct nfs_client *);
 411#else
 412static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 413{
 414}
 415#endif /* CONFIG_NFS_V4_1 */
 416
 417extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 418extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 419extern void nfs4_purge_state_owners(struct nfs_server *);
 420extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 421extern void nfs4_put_open_state(struct nfs4_state *);
 422extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 423extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 424extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 425extern void nfs_inode_find_state_and_recover(struct inode *inode,
 426                const nfs4_stateid *stateid);
 427extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 428extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 429extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 430extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 431extern void nfs4_schedule_state_manager(struct nfs_client *);
 432extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 433extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 434extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 435extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 436extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
 437extern void nfs41_handle_server_scope(struct nfs_client *,
 438                                      struct nfs41_server_scope **);
 439extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 440extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 441extern int nfs4_select_rw_stateid(nfs4_stateid *, struct nfs4_state *,
 442                fmode_t, const struct nfs_lockowner *);
 443
 444extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 445extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 446extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 447extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 448extern void nfs_release_seqid(struct nfs_seqid *seqid);
 449extern void nfs_free_seqid(struct nfs_seqid *seqid);
 450extern 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);
 454extern int nfs4_sequence_done(struct rpc_task *task,
 455                              struct nfs4_sequence_res *res);
 456
 457extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 458
 459extern const nfs4_stateid zero_stateid;
 460
 461/* nfs4super.c */
 462struct nfs_mount_info;
 463extern struct nfs_subversion nfs_v4;
 464struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 465extern bool nfs4_disable_idmapping;
 466extern unsigned short max_session_slots;
 467extern unsigned short send_implementation_id;
 468extern bool recover_lost_locks;
 469
 470#define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 471extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 472
 473/* nfs4sysctl.c */
 474#ifdef CONFIG_SYSCTL
 475int nfs4_register_sysctl(void);
 476void nfs4_unregister_sysctl(void);
 477#else
 478static inline int nfs4_register_sysctl(void)
 479{
 480        return 0;
 481}
 482
 483static inline void nfs4_unregister_sysctl(void)
 484{
 485}
 486#endif
 487
 488/* nfs4xdr.c */
 489extern struct rpc_procinfo nfs4_procedures[];
 490
 491struct nfs4_mount_data;
 492
 493/* callback_xdr.c */
 494extern struct svc_version nfs4_callback_version1;
 495extern struct svc_version nfs4_callback_version4;
 496
 497static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 498{
 499        memcpy(dst, src, sizeof(*dst));
 500}
 501
 502static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 503{
 504        return memcmp(dst, src, sizeof(*dst)) == 0;
 505}
 506
 507static 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
 512static 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
 517static 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 */
 531