linux/fs/nfs/nfs4_fs.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * linux/fs/nfs/nfs4_fs.h
   4 *
   5 * Copyright (C) 2005 Trond Myklebust
   6 *
   7 * NFSv4-specific filesystem definitions and declarations
   8 */
   9
  10#ifndef __LINUX_FS_NFS_NFS4_FS_H
  11#define __LINUX_FS_NFS_NFS4_FS_H
  12
  13#if defined(CONFIG_NFS_V4_2)
  14#define NFS4_MAX_MINOR_VERSION 2
  15#elif defined(CONFIG_NFS_V4_1)
  16#define NFS4_MAX_MINOR_VERSION 1
  17#else
  18#define NFS4_MAX_MINOR_VERSION 0
  19#endif
  20
  21#if IS_ENABLED(CONFIG_NFS_V4)
  22
  23#define NFS4_MAX_LOOP_ON_RECOVER (10)
  24
  25#include <linux/seqlock.h>
  26
  27struct idmap;
  28
  29enum nfs4_client_state {
  30        NFS4CLNT_MANAGER_RUNNING  = 0,
  31        NFS4CLNT_CHECK_LEASE,
  32        NFS4CLNT_LEASE_EXPIRED,
  33        NFS4CLNT_RECLAIM_REBOOT,
  34        NFS4CLNT_RECLAIM_NOGRACE,
  35        NFS4CLNT_DELEGRETURN,
  36        NFS4CLNT_SESSION_RESET,
  37        NFS4CLNT_LEASE_CONFIRM,
  38        NFS4CLNT_SERVER_SCOPE_MISMATCH,
  39        NFS4CLNT_PURGE_STATE,
  40        NFS4CLNT_BIND_CONN_TO_SESSION,
  41        NFS4CLNT_MOVED,
  42        NFS4CLNT_LEASE_MOVED,
  43        NFS4CLNT_DELEGATION_EXPIRED,
  44        NFS4CLNT_RUN_MANAGER,
  45        NFS4CLNT_DELEGRETURN_RUNNING,
  46};
  47
  48#define NFS4_RENEW_TIMEOUT              0x01
  49#define NFS4_RENEW_DELEGATION_CB        0x02
  50
  51struct nfs_seqid_counter;
  52struct nfs4_minor_version_ops {
  53        u32     minor_version;
  54        unsigned init_caps;
  55
  56        int     (*init_client)(struct nfs_client *);
  57        void    (*shutdown_client)(struct nfs_client *);
  58        bool    (*match_stateid)(const nfs4_stateid *,
  59                        const nfs4_stateid *);
  60        int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  61                        struct nfs_fsinfo *);
  62        void    (*free_lock_state)(struct nfs_server *,
  63                        struct nfs4_lock_state *);
  64        int     (*test_and_free_expired)(struct nfs_server *,
  65                        nfs4_stateid *, const struct cred *);
  66        struct nfs_seqid *
  67                (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  68        void    (*session_trunk)(struct rpc_clnt *clnt,
  69                        struct rpc_xprt *xprt, void *data);
  70        const struct rpc_call_ops *call_sync_ops;
  71        const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  72        const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  73        const struct nfs4_state_maintenance_ops *state_renewal_ops;
  74        const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  75};
  76
  77#define NFS_SEQID_CONFIRMED 1
  78struct nfs_seqid_counter {
  79        ktime_t create_time;
  80        int owner_id;
  81        int flags;
  82        u32 counter;
  83        spinlock_t lock;                /* Protects the list */
  84        struct list_head list;          /* Defines sequence of RPC calls */
  85        struct rpc_wait_queue   wait;   /* RPC call delay queue */
  86};
  87
  88struct nfs_seqid {
  89        struct nfs_seqid_counter *sequence;
  90        struct list_head list;
  91        struct rpc_task *task;
  92};
  93
  94static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  95{
  96        if (seqid_mutating_err(-status))
  97                seqid->flags |= NFS_SEQID_CONFIRMED;
  98}
  99
 100/*
 101 * NFS4 state_owners and lock_owners are simply labels for ordered
 102 * sequences of RPC calls. Their sole purpose is to provide once-only
 103 * semantics by allowing the server to identify replayed requests.
 104 */
 105struct nfs4_state_owner {
 106        struct nfs_server    *so_server;
 107        struct list_head     so_lru;
 108        unsigned long        so_expires;
 109        struct rb_node       so_server_node;
 110
 111        const struct cred    *so_cred;   /* Associated cred */
 112
 113        spinlock_t           so_lock;
 114        atomic_t             so_count;
 115        unsigned long        so_flags;
 116        struct list_head     so_states;
 117        struct nfs_seqid_counter so_seqid;
 118        seqcount_t           so_reclaim_seqcount;
 119        struct mutex         so_delegreturn_mutex;
 120};
 121
 122enum {
 123        NFS_OWNER_RECLAIM_REBOOT,
 124        NFS_OWNER_RECLAIM_NOGRACE
 125};
 126
 127#define NFS_LOCK_NEW            0
 128#define NFS_LOCK_RECLAIM        1
 129#define NFS_LOCK_EXPIRED        2
 130
 131/*
 132 * struct nfs4_state maintains the client-side state for a given
 133 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 134 *
 135 * OPEN:
 136 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 137 * we need to know how many files are open for reading or writing on a
 138 * given inode. This information too is stored here.
 139 *
 140 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 141 */
 142
 143struct nfs4_lock_state {
 144        struct list_head        ls_locks;       /* Other lock stateids */
 145        struct nfs4_state *     ls_state;       /* Pointer to open state */
 146#define NFS_LOCK_INITIALIZED 0
 147#define NFS_LOCK_LOST        1
 148        unsigned long           ls_flags;
 149        struct nfs_seqid_counter        ls_seqid;
 150        nfs4_stateid            ls_stateid;
 151        refcount_t              ls_count;
 152        fl_owner_t              ls_owner;
 153};
 154
 155/* bits for nfs4_state->flags */
 156enum {
 157        LK_STATE_IN_USE,
 158        NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 159        NFS_OPEN_STATE,                 /* OPEN stateid is set */
 160        NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 161        NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 162        NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 163        NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 164        NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 165        NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 166        NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 167        NFS_STATE_MAY_NOTIFY_LOCK,      /* server may CB_NOTIFY_LOCK */
 168        NFS_STATE_CHANGE_WAIT,          /* A state changing operation is outstanding */
 169        NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
 170        NFS_CLNT_SRC_SSC_COPY_STATE,    /* src server open state on client*/
 171        NFS_SRV_SSC_COPY_STATE,         /* ssc state on the dst server */
 172};
 173
 174struct nfs4_state {
 175        struct list_head open_states;   /* List of states for the same state_owner */
 176        struct list_head inode_states;  /* List of states for the same inode */
 177        struct list_head lock_states;   /* List of subservient lock stateids */
 178
 179        struct nfs4_state_owner *owner; /* Pointer to the open owner */
 180        struct inode *inode;            /* Pointer to the inode */
 181
 182        unsigned long flags;            /* Do we hold any locks? */
 183        spinlock_t state_lock;          /* Protects the lock_states list */
 184
 185        seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 186        nfs4_stateid stateid;           /* Current stateid: may be delegation */
 187        nfs4_stateid open_stateid;      /* OPEN stateid */
 188
 189        /* The following 3 fields are protected by owner->so_lock */
 190        unsigned int n_rdonly;          /* Number of read-only references */
 191        unsigned int n_wronly;          /* Number of write-only references */
 192        unsigned int n_rdwr;            /* Number of read/write references */
 193        fmode_t state;                  /* State on the server (R,W, or RW) */
 194        refcount_t count;
 195
 196        wait_queue_head_t waitq;
 197        struct rcu_head rcu_head;
 198};
 199
 200
 201struct nfs4_exception {
 202        struct nfs4_state *state;
 203        struct inode *inode;
 204        nfs4_stateid *stateid;
 205        long timeout;
 206        unsigned char delay : 1,
 207                      recovering : 1,
 208                      retry : 1;
 209        bool interruptible;
 210};
 211
 212struct nfs4_state_recovery_ops {
 213        int owner_flag_bit;
 214        int state_flag_bit;
 215        int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 216        int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 217        int (*establish_clid)(struct nfs_client *, const struct cred *);
 218        int (*reclaim_complete)(struct nfs_client *, const struct cred *);
 219        int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 220                const struct cred *);
 221};
 222
 223struct nfs4_opendata {
 224        struct kref kref;
 225        struct nfs_openargs o_arg;
 226        struct nfs_openres o_res;
 227        struct nfs_open_confirmargs c_arg;
 228        struct nfs_open_confirmres c_res;
 229        struct nfs4_string owner_name;
 230        struct nfs4_string group_name;
 231        struct nfs4_label *a_label;
 232        struct nfs_fattr f_attr;
 233        struct nfs4_label *f_label;
 234        struct dentry *dir;
 235        struct dentry *dentry;
 236        struct nfs4_state_owner *owner;
 237        struct nfs4_state *state;
 238        struct iattr attrs;
 239        struct nfs4_layoutget *lgp;
 240        unsigned long timestamp;
 241        bool rpc_done;
 242        bool file_created;
 243        bool is_recover;
 244        bool cancelled;
 245        int rpc_status;
 246};
 247
 248struct nfs4_add_xprt_data {
 249        struct nfs_client       *clp;
 250        const struct cred       *cred;
 251};
 252
 253struct nfs4_state_maintenance_ops {
 254        int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
 255        const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
 256        int (*renew_lease)(struct nfs_client *, const struct cred *);
 257};
 258
 259struct nfs4_mig_recovery_ops {
 260        int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 261                struct page *, const struct cred *);
 262        int (*fsid_present)(struct inode *, const struct cred *);
 263};
 264
 265extern const struct dentry_operations nfs4_dentry_operations;
 266
 267/* dir.c */
 268int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 269                    unsigned, umode_t);
 270
 271/* fs_context.c */
 272extern struct file_system_type nfs4_fs_type;
 273
 274/* nfs4namespace.c */
 275struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 276                                         const struct qstr *);
 277int nfs4_submount(struct fs_context *, struct nfs_server *);
 278int nfs4_replace_transport(struct nfs_server *server,
 279                                const struct nfs4_fs_locations *locations);
 280
 281/* nfs4proc.c */
 282extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 283extern int nfs4_async_handle_error(struct rpc_task *task,
 284                                   struct nfs_server *server,
 285                                   struct nfs4_state *state, long *timeout);
 286extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 287                          struct rpc_message *, struct nfs4_sequence_args *,
 288                          struct nfs4_sequence_res *, int);
 289extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 290extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 291extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 292extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 293extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 294extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 295extern int nfs4_destroy_clientid(struct nfs_client *clp);
 296extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 297extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 298extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 299extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 300extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 301                                  struct nfs4_fs_locations *, struct page *);
 302extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 303                struct page *page, const struct cred *);
 304extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 305extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
 306                                                    struct dentry *,
 307                                                    struct nfs_fh *,
 308                                                    struct nfs_fattr *);
 309extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 310extern const struct xattr_handler *nfs4_xattr_handlers[];
 311extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 312                const struct nfs_open_context *ctx,
 313                const struct nfs_lock_context *l_ctx,
 314                fmode_t fmode);
 315extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 316                             struct nfs_fattr *fattr, struct nfs4_label *label,
 317                             struct inode *inode);
 318extern int update_open_stateid(struct nfs4_state *state,
 319                                const nfs4_stateid *open_stateid,
 320                                const nfs4_stateid *deleg_stateid,
 321                                fmode_t fmode);
 322
 323extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 324                struct nfs_fsinfo *fsinfo);
 325#if defined(CONFIG_NFS_V4_1)
 326extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 327extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 328extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 329extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 330                                  bool sync);
 331extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 332                struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 333
 334static inline bool
 335is_ds_only_client(struct nfs_client *clp)
 336{
 337        return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 338                EXCHGID4_FLAG_USE_PNFS_DS;
 339}
 340
 341static inline bool
 342is_ds_client(struct nfs_client *clp)
 343{
 344        return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 345}
 346
 347static inline bool
 348_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 349                    struct rpc_clnt **clntp, struct rpc_message *msg)
 350{
 351        rpc_authflavor_t flavor;
 352
 353        if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 354            sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 355                /* Using machine creds for cleanup operations
 356                 * is only relevent if the client credentials
 357                 * might expire. So don't bother for
 358                 * RPC_AUTH_UNIX.  If file was only exported to
 359                 * sec=sys, the PUTFH would fail anyway.
 360                 */
 361                if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 362                        return false;
 363        }
 364        if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 365                msg->rpc_cred = rpc_machine_cred();
 366
 367                flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 368                WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 369                             flavor != RPC_AUTH_GSS_KRB5P);
 370                *clntp = clp->cl_rpcclient;
 371
 372                return true;
 373        }
 374        return false;
 375}
 376
 377/*
 378 * Function responsible for determining if an rpc_message should use the
 379 * machine cred under SP4_MACH_CRED and if so switching the credential and
 380 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 381 * Should be called before rpc_call_sync/rpc_call_async.
 382 */
 383static inline void
 384nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 385                   struct rpc_clnt **clntp, struct rpc_message *msg)
 386{
 387        _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 388}
 389
 390/*
 391 * Special wrapper to nfs4_state_protect for write.
 392 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 393 * that use machine cred use NFS_FILE_SYNC.
 394 */
 395static inline void
 396nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 397                         struct rpc_message *msg, struct nfs_pgio_header *hdr)
 398{
 399        if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 400            !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 401                hdr->args.stable = NFS_FILE_SYNC;
 402}
 403#else /* CONFIG_NFS_v4_1 */
 404static inline bool
 405is_ds_only_client(struct nfs_client *clp)
 406{
 407        return false;
 408}
 409
 410static inline bool
 411is_ds_client(struct nfs_client *clp)
 412{
 413        return false;
 414}
 415
 416static inline void
 417nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 418                   struct rpc_clnt **clntp, struct rpc_message *msg)
 419{
 420}
 421
 422static inline void
 423nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 424                         struct rpc_message *msg, struct nfs_pgio_header *hdr)
 425{
 426}
 427#endif /* CONFIG_NFS_V4_1 */
 428
 429extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 430
 431extern const u32 nfs4_fattr_bitmap[3];
 432extern const u32 nfs4_statfs_bitmap[3];
 433extern const u32 nfs4_pathconf_bitmap[3];
 434extern const u32 nfs4_fsinfo_bitmap[3];
 435extern const u32 nfs4_fs_locations_bitmap[3];
 436
 437void nfs40_shutdown_client(struct nfs_client *);
 438void nfs41_shutdown_client(struct nfs_client *);
 439int nfs40_init_client(struct nfs_client *);
 440int nfs41_init_client(struct nfs_client *);
 441void nfs4_free_client(struct nfs_client *);
 442
 443struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 444
 445/* nfs4renewd.c */
 446extern void nfs4_schedule_state_renewal(struct nfs_client *);
 447extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 448extern void nfs4_kill_renewd(struct nfs_client *);
 449extern void nfs4_renew_state(struct work_struct *);
 450extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 451
 452
 453/* nfs4state.c */
 454extern const nfs4_stateid current_stateid;
 455
 456const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 457const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 458const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 459int nfs4_discover_server_trunking(struct nfs_client *clp,
 460                        struct nfs_client **);
 461int nfs40_discover_server_trunking(struct nfs_client *clp,
 462                        struct nfs_client **, const struct cred *);
 463#if defined(CONFIG_NFS_V4_1)
 464int nfs41_discover_server_trunking(struct nfs_client *clp,
 465                        struct nfs_client **, const struct cred *);
 466extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 467extern void nfs41_notify_server(struct nfs_client *);
 468bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 469                        struct nfs41_server_owner *o2);
 470#else
 471static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 472{
 473}
 474#endif /* CONFIG_NFS_V4_1 */
 475
 476extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 477extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 478extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 479extern void nfs4_free_state_owners(struct list_head *head);
 480extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 481extern void nfs4_put_open_state(struct nfs4_state *);
 482extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 483extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 484extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 485extern void nfs_inode_find_state_and_recover(struct inode *inode,
 486                const nfs4_stateid *stateid);
 487extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 488extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 489extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 490extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 491extern void nfs4_schedule_state_manager(struct nfs_client *);
 492extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 493extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 494extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 495extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 496extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 497extern void nfs41_handle_server_scope(struct nfs_client *,
 498                                      struct nfs41_server_scope **);
 499extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 500extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 501extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 502                const struct nfs_lock_context *, nfs4_stateid *,
 503                const struct cred **);
 504extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 505                struct nfs4_state *state);
 506
 507extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 508extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 509extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 510extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 511extern void nfs_release_seqid(struct nfs_seqid *seqid);
 512extern void nfs_free_seqid(struct nfs_seqid *seqid);
 513extern int nfs4_setup_sequence(struct nfs_client *client,
 514                                struct nfs4_sequence_args *args,
 515                                struct nfs4_sequence_res *res,
 516                                struct rpc_task *task);
 517extern int nfs4_sequence_done(struct rpc_task *task,
 518                              struct nfs4_sequence_res *res);
 519
 520extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 521extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 522extern const nfs4_stateid zero_stateid;
 523extern const nfs4_stateid invalid_stateid;
 524
 525/* nfs4super.c */
 526struct nfs_mount_info;
 527extern struct nfs_subversion nfs_v4;
 528extern bool nfs4_disable_idmapping;
 529extern unsigned short max_session_slots;
 530extern unsigned short max_session_cb_slots;
 531extern unsigned short send_implementation_id;
 532extern bool recover_lost_locks;
 533
 534#define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 535extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 536
 537extern int nfs4_try_get_tree(struct fs_context *);
 538extern int nfs4_get_referral_tree(struct fs_context *);
 539
 540/* nfs4sysctl.c */
 541#ifdef CONFIG_SYSCTL
 542int nfs4_register_sysctl(void);
 543void nfs4_unregister_sysctl(void);
 544#else
 545static inline int nfs4_register_sysctl(void)
 546{
 547        return 0;
 548}
 549
 550static inline void nfs4_unregister_sysctl(void)
 551{
 552}
 553#endif
 554
 555/* nfs4xdr.c */
 556extern const struct rpc_procinfo nfs4_procedures[];
 557
 558struct nfs4_mount_data;
 559
 560/* callback_xdr.c */
 561extern const struct svc_version nfs4_callback_version1;
 562extern const struct svc_version nfs4_callback_version4;
 563
 564static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 565{
 566        memcpy(dst->data, src->data, sizeof(dst->data));
 567        dst->type = src->type;
 568}
 569
 570static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 571{
 572        if (dst->type != src->type)
 573                return false;
 574        return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 575}
 576
 577static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 578{
 579        return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 580}
 581
 582static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 583{
 584        return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 585}
 586
 587static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
 588{
 589        return nfs4_stateid_match_other(dst, src) &&
 590                !(src->seqid && nfs4_stateid_is_newer(dst, src));
 591}
 592
 593static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
 594{
 595        u32 seqid = be32_to_cpu(s1->seqid);
 596
 597        if (++seqid == 0)
 598                ++seqid;
 599        s1->seqid = cpu_to_be32(seqid);
 600}
 601
 602static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 603{
 604        return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 605}
 606
 607static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 608                const nfs4_stateid *stateid)
 609{
 610        return test_bit(NFS_OPEN_STATE, &state->flags) &&
 611                nfs4_stateid_match_other(&state->open_stateid, stateid);
 612}
 613
 614#else
 615
 616#define nfs4_close_state(a, b) do { } while (0)
 617#define nfs4_close_sync(a, b) do { } while (0)
 618#define nfs4_state_protect(a, b, c, d) do { } while (0)
 619#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 620
 621#endif /* CONFIG_NFS_V4 */
 622#endif /* __LINUX_FS_NFS_NFS4_FS.H */
 623
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