fs/nfs/nfs4_fs.h

   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
  27 struct idmap;
  28
  29 enum 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
  51 struct nfs_seqid_counter;
  52 struct 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 *, struct rpc_cred *);
  66         struct nfs_seqid *
  67                 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  68         int     (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
  69         const struct rpc_call_ops *call_sync_ops;
  70         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  71         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  72         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  73         const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  74 };
  75
  76 #define NFS_SEQID_CONFIRMED 1
  77 struct nfs_seqid_counter {
  78         ktime_t create_time;
  79         int owner_id;
  80         int flags;
  81         u32 counter;
  82         spinlock_t lock;                /* Protects the list */
  83         struct list_head list;          /* Defines sequence of RPC calls */
  84         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  85 };
  86
  87 struct nfs_seqid {
  88         struct nfs_seqid_counter *sequence;
  89         struct list_head list;
  90         struct rpc_task *task;
  91 };
  92
  93 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  94 {
  95         if (seqid_mutating_err(-status))
  96                 seqid->flags |= NFS_SEQID_CONFIRMED;
  97 }
  98
  99 /*
 100  * NFS4 state_owners and lock_owners are simply labels for ordered
 101  * sequences of RPC calls. Their sole purpose is to provide once-only
 102  * semantics by allowing the server to identify replayed requests.
 103  */
 104 struct nfs4_state_owner {
 105         struct nfs_server    *so_server;
 106         struct list_head     so_lru;
 107         unsigned long        so_expires;
 108         struct rb_node       so_server_node;
 109
 110         struct rpc_cred      *so_cred;   /* Associated cred */
 111
 112         spinlock_t           so_lock;
 113         atomic_t             so_count;
 114         unsigned long        so_flags;
 115         struct list_head     so_states;
 116         struct nfs_seqid_counter so_seqid;
 117         seqcount_t           so_reclaim_seqcount;
 118         struct mutex         so_delegreturn_mutex;
 119 };
 120
 121 enum {
 122         NFS_OWNER_RECLAIM_REBOOT,
 123         NFS_OWNER_RECLAIM_NOGRACE
 124 };
 125
 126 #define NFS_LOCK_NEW            0
 127 #define NFS_LOCK_RECLAIM        1
 128 #define NFS_LOCK_EXPIRED        2
 129
 130 /*
 131  * struct nfs4_state maintains the client-side state for a given
 132  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 133  *
 134  * OPEN:
 135  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 136  * we need to know how many files are open for reading or writing on a
 137  * given inode. This information too is stored here.
 138  *
 139  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 140  */
 141
 142 struct nfs4_lock_state {
 143         struct list_head        ls_locks;       /* Other lock stateids */
 144         struct nfs4_state *     ls_state;       /* Pointer to open state */
 145 #define NFS_LOCK_INITIALIZED 0
 146 #define NFS_LOCK_LOST        1
 147         unsigned long           ls_flags;
 148         struct nfs_seqid_counter        ls_seqid;
 149         nfs4_stateid            ls_stateid;
 150         refcount_t              ls_count;
 151         fl_owner_t              ls_owner;
 152 };
 153
 154 /* bits for nfs4_state->flags */
 155 enum {
 156         LK_STATE_IN_USE,
 157         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 158         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 159         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 160         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 161         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 162         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 163         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 164         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 165         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 166         NFS_STATE_MAY_NOTIFY_LOCK,      /* server may CB_NOTIFY_LOCK */
 167         NFS_STATE_CHANGE_WAIT,          /* A state changing operation is outstanding */
 168 #ifdef CONFIG_NFS_V4_2
 169         NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
 170 #endif /* CONFIG_NFS_V4_2 */
 171 };
 172
 173 struct nfs4_state {
 174         struct list_head open_states;   /* List of states for the same state_owner */
 175         struct list_head inode_states;  /* List of states for the same inode */
 176         struct list_head lock_states;   /* List of subservient lock stateids */
 177
 178         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 179         struct inode *inode;            /* Pointer to the inode */
 180
 181         unsigned long flags;            /* Do we hold any locks? */
 182         spinlock_t state_lock;          /* Protects the lock_states list */
 183
 184         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 185         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 186         nfs4_stateid open_stateid;      /* OPEN stateid */
 187
 188         /* The following 3 fields are protected by owner->so_lock */
 189         unsigned int n_rdonly;          /* Number of read-only references */
 190         unsigned int n_wronly;          /* Number of write-only references */
 191         unsigned int n_rdwr;            /* Number of read/write references */
 192         fmode_t state;                  /* State on the server (R,W, or RW) */
 193         atomic_t count;
 194
 195         wait_queue_head_t waitq;
 196 };
 197
 198
 199 struct nfs4_exception {
 200         struct nfs4_state *state;
 201         struct inode *inode;
 202         nfs4_stateid *stateid;
 203         long timeout;
 204         unsigned char delay : 1,
 205                       recovering : 1,
 206                       retry : 1;
 207 };
 208
 209 struct nfs4_state_recovery_ops {
 210         int owner_flag_bit;
 211         int state_flag_bit;
 212         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 213         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 214         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 215         int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
 216         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 217                 struct rpc_cred *);
 218 };
 219
 220 struct nfs4_opendata {
 221         struct kref kref;
 222         struct nfs_openargs o_arg;
 223         struct nfs_openres o_res;
 224         struct nfs_open_confirmargs c_arg;
 225         struct nfs_open_confirmres c_res;
 226         struct nfs4_string owner_name;
 227         struct nfs4_string group_name;
 228         struct nfs4_label *a_label;
 229         struct nfs_fattr f_attr;
 230         struct nfs4_label *f_label;
 231         struct dentry *dir;
 232         struct dentry *dentry;
 233         struct nfs4_state_owner *owner;
 234         struct nfs4_state *state;
 235         struct iattr attrs;
 236         struct nfs4_layoutget *lgp;
 237         unsigned long timestamp;
 238         bool rpc_done;
 239         bool file_created;
 240         bool is_recover;
 241         bool cancelled;
 242         int rpc_status;
 243 };
 244
 245 struct nfs4_add_xprt_data {
 246         struct nfs_client       *clp;
 247         struct rpc_cred         *cred;
 248 };
 249
 250 struct nfs4_state_maintenance_ops {
 251         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 252         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 253         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 254 };
 255
 256 struct nfs4_mig_recovery_ops {
 257         int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 258                 struct page *, struct rpc_cred *);
 259         int (*fsid_present)(struct inode *, struct rpc_cred *);
 260 };
 261
 262 extern const struct dentry_operations nfs4_dentry_operations;
 263
 264 /* dir.c */
 265 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 266                     unsigned, umode_t);
 267
 268 /* super.c */
 269 extern struct file_system_type nfs4_fs_type;
 270
 271 /* nfs4namespace.c */
 272 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 273                                          const struct qstr *);
 274 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 275                                struct nfs_fh *, struct nfs_fattr *);
 276 int nfs4_replace_transport(struct nfs_server *server,
 277                                 const struct nfs4_fs_locations *locations);
 278
 279 /* nfs4proc.c */
 280 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 281 extern int nfs4_async_handle_error(struct rpc_task *task,
 282                                    struct nfs_server *server,
 283                                    struct nfs4_state *state, long *timeout);
 284 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 285                           struct rpc_message *, struct nfs4_sequence_args *,
 286                           struct nfs4_sequence_res *, int);
 287 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 288 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 289 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 290 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 291 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 292 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 293 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 294 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 295 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 296 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 297 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 298 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 299                                   struct nfs4_fs_locations *, struct page *);
 300 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 301                 struct page *page, struct rpc_cred *);
 302 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
 303 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
 304                             struct nfs_fh *, struct nfs_fattr *);
 305 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 306 extern const struct xattr_handler *nfs4_xattr_handlers[];
 307 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 308                 const struct nfs_open_context *ctx,
 309                 const struct nfs_lock_context *l_ctx,
 310                 fmode_t fmode);
 311
 312 #if defined(CONFIG_NFS_V4_1)
 313 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 314 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 315 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 316 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 317                 struct nfs_fsinfo *fsinfo);
 318 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 319                                   bool sync);
 320 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 321                 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 322
 323 static inline bool
 324 is_ds_only_client(struct nfs_client *clp)
 325 {
 326         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 327                 EXCHGID4_FLAG_USE_PNFS_DS;
 328 }
 329
 330 static inline bool
 331 is_ds_client(struct nfs_client *clp)
 332 {
 333         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 334 }
 335
 336 static inline bool
 337 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 338                     struct rpc_clnt **clntp, struct rpc_message *msg)
 339 {
 340         struct rpc_cred *newcred = NULL;
 341         rpc_authflavor_t flavor;
 342
 343         if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 344             sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 345                 /* Using machine creds for cleanup operations
 346                  * is only relevent if the client credentials
 347                  * might expire. So don't bother for
 348                  * RPC_AUTH_UNIX.  If file was only exported to
 349                  * sec=sys, the PUTFH would fail anyway.
 350                  */
 351                 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 352                         return false;
 353         }
 354         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 355                 spin_lock(&clp->cl_lock);
 356                 if (clp->cl_machine_cred != NULL)
 357                         /* don't call get_rpccred on the machine cred -
 358                          * a reference will be held for life of clp */
 359                         newcred = clp->cl_machine_cred;
 360                 spin_unlock(&clp->cl_lock);
 361                 msg->rpc_cred = newcred;
 362
 363                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 364                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 365                              flavor != RPC_AUTH_GSS_KRB5P);
 366                 *clntp = clp->cl_rpcclient;
 367
 368                 return true;
 369         }
 370         return false;
 371 }
 372
 373 /*
 374  * Function responsible for determining if an rpc_message should use the
 375  * machine cred under SP4_MACH_CRED and if so switching the credential and
 376  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 377  * Should be called before rpc_call_sync/rpc_call_async.
 378  */
 379 static inline void
 380 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 381                    struct rpc_clnt **clntp, struct rpc_message *msg)
 382 {
 383         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 384 }
 385
 386 /*
 387  * Special wrapper to nfs4_state_protect for write.
 388  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 389  * that use machine cred use NFS_FILE_SYNC.
 390  */
 391 static inline void
 392 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 393                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 394 {
 395         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 396             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 397                 hdr->args.stable = NFS_FILE_SYNC;
 398 }
 399 #else /* CONFIG_NFS_v4_1 */
 400 static inline bool
 401 is_ds_only_client(struct nfs_client *clp)
 402 {
 403         return false;
 404 }
 405
 406 static inline bool
 407 is_ds_client(struct nfs_client *clp)
 408 {
 409         return false;
 410 }
 411
 412 static inline void
 413 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 414                    struct rpc_clnt **clntp, struct rpc_message *msg)
 415 {
 416 }
 417
 418 static inline void
 419 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 420                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 421 {
 422 }
 423 #endif /* CONFIG_NFS_V4_1 */
 424
 425 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 426
 427 extern const u32 nfs4_fattr_bitmap[3];
 428 extern const u32 nfs4_statfs_bitmap[3];
 429 extern const u32 nfs4_pathconf_bitmap[3];
 430 extern const u32 nfs4_fsinfo_bitmap[3];
 431 extern const u32 nfs4_fs_locations_bitmap[3];
 432
 433 void nfs40_shutdown_client(struct nfs_client *);
 434 void nfs41_shutdown_client(struct nfs_client *);
 435 int nfs40_init_client(struct nfs_client *);
 436 int nfs41_init_client(struct nfs_client *);
 437 void nfs4_free_client(struct nfs_client *);
 438
 439 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 440
 441 /* nfs4renewd.c */
 442 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 443 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 444 extern void nfs4_kill_renewd(struct nfs_client *);
 445 extern void nfs4_renew_state(struct work_struct *);
 446 extern void nfs4_set_lease_period(struct nfs_client *clp,
 447                 unsigned long lease,
 448                 unsigned long lastrenewed);
 449
 450
 451 /* nfs4state.c */
 452 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
 453 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 454 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 455 int nfs4_discover_server_trunking(struct nfs_client *clp,
 456                         struct nfs_client **);
 457 int nfs40_discover_server_trunking(struct nfs_client *clp,
 458                         struct nfs_client **, struct rpc_cred *);
 459 #if defined(CONFIG_NFS_V4_1)
 460 int nfs41_discover_server_trunking(struct nfs_client *clp,
 461                         struct nfs_client **, struct rpc_cred *);
 462 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 463 extern void nfs41_notify_server(struct nfs_client *);
 464 #else
 465 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 466 {
 467 }
 468 #endif /* CONFIG_NFS_V4_1 */
 469
 470 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 471 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 472 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 473 extern void nfs4_free_state_owners(struct list_head *head);
 474 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 475 extern void nfs4_put_open_state(struct nfs4_state *);
 476 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 477 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 478 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 479 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 480                 const nfs4_stateid *stateid);
 481 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 482 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 483 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 484 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 485 extern void nfs4_schedule_state_manager(struct nfs_client *);
 486 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 487 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 488 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 489 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 490 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 491 extern void nfs41_handle_server_scope(struct nfs_client *,
 492                                       struct nfs41_server_scope **);
 493 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 494 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 495 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 496                 const struct nfs_lock_context *, nfs4_stateid *,
 497                 struct rpc_cred **);
 498 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
 499                 struct nfs4_state *state);
 500 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 501                 struct nfs4_state *state);
 502
 503 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 504 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 505 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 506 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 507 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 508 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 509 extern int nfs4_setup_sequence(struct nfs_client *client,
 510                                 struct nfs4_sequence_args *args,
 511                                 struct nfs4_sequence_res *res,
 512                                 struct rpc_task *task);
 513 extern int nfs4_sequence_done(struct rpc_task *task,
 514                               struct nfs4_sequence_res *res);
 515
 516 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 517 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 518 extern const nfs4_stateid zero_stateid;
 519 extern const nfs4_stateid invalid_stateid;
 520
 521 /* nfs4super.c */
 522 struct nfs_mount_info;
 523 extern struct nfs_subversion nfs_v4;
 524 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 525 extern bool nfs4_disable_idmapping;
 526 extern unsigned short max_session_slots;
 527 extern unsigned short max_session_cb_slots;
 528 extern unsigned short send_implementation_id;
 529 extern bool recover_lost_locks;
 530
 531 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 532 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 533
 534 /* nfs4sysctl.c */
 535 #ifdef CONFIG_SYSCTL
 536 int nfs4_register_sysctl(void);
 537 void nfs4_unregister_sysctl(void);
 538 #else
 539 static inline int nfs4_register_sysctl(void)
 540 {
 541         return 0;
 542 }
 543
 544 static inline void nfs4_unregister_sysctl(void)
 545 {
 546 }
 547 #endif
 548
 549 /* nfs4xdr.c */
 550 extern const struct rpc_procinfo nfs4_procedures[];
 551
 552 struct nfs4_mount_data;
 553
 554 /* callback_xdr.c */
 555 extern const struct svc_version nfs4_callback_version1;
 556 extern const struct svc_version nfs4_callback_version4;
 557
 558 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 559 {
 560         memcpy(dst->data, src->data, sizeof(dst->data));
 561         dst->type = src->type;
 562 }
 563
 564 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 565 {
 566         if (dst->type != src->type)
 567                 return false;
 568         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 569 }
 570
 571 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 572 {
 573         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 574 }
 575
 576 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 577 {
 578         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 579 }
 580
 581 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 582 {
 583         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 584 }
 585
 586 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 587                 const nfs4_stateid *stateid)
 588 {
 589         return test_bit(NFS_OPEN_STATE, &state->flags) &&
 590                 nfs4_stateid_match_other(&state->open_stateid, stateid);
 591 }
 592
 593 #else
 594
 595 #define nfs4_close_state(a, b) do { } while (0)
 596 #define nfs4_close_sync(a, b) do { } while (0)
 597 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 598 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 599
 600 #endif /* CONFIG_NFS_V4 */
 601 #endif /* __LINUX_FS_NFS_NFS4_FS.H */