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 };
  45
  46 #define NFS4_RENEW_TIMEOUT              0x01
  47 #define NFS4_RENEW_DELEGATION_CB        0x02
  48
  49 struct nfs_seqid_counter;
  50 struct nfs4_minor_version_ops {
  51         u32     minor_version;
  52         unsigned init_caps;
  53
  54         int     (*init_client)(struct nfs_client *);
  55         void    (*shutdown_client)(struct nfs_client *);
  56         bool    (*match_stateid)(const nfs4_stateid *,
  57                         const nfs4_stateid *);
  58         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  59                         struct nfs_fsinfo *);
  60         void    (*free_lock_state)(struct nfs_server *,
  61                         struct nfs4_lock_state *);
  62         int     (*test_and_free_expired)(struct nfs_server *,
  63                         nfs4_stateid *, struct rpc_cred *);
  64         struct nfs_seqid *
  65                 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  66         int     (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *);
  67         const struct rpc_call_ops *call_sync_ops;
  68         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  69         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  70         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  71         const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  72 };
  73
  74 #define NFS_SEQID_CONFIRMED 1
  75 struct nfs_seqid_counter {
  76         ktime_t create_time;
  77         int owner_id;
  78         int flags;
  79         u32 counter;
  80         spinlock_t lock;                /* Protects the list */
  81         struct list_head list;          /* Defines sequence of RPC calls */
  82         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  83 };
  84
  85 struct nfs_seqid {
  86         struct nfs_seqid_counter *sequence;
  87         struct list_head list;
  88         struct rpc_task *task;
  89 };
  90
  91 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  92 {
  93         if (seqid_mutating_err(-status))
  94                 seqid->flags |= NFS_SEQID_CONFIRMED;
  95 }
  96
  97 /*
  98  * NFS4 state_owners and lock_owners are simply labels for ordered
  99  * sequences of RPC calls. Their sole purpose is to provide once-only
 100  * semantics by allowing the server to identify replayed requests.
 101  */
 102 struct nfs4_state_owner {
 103         struct nfs_server    *so_server;
 104         struct list_head     so_lru;
 105         unsigned long        so_expires;
 106         struct rb_node       so_server_node;
 107
 108         struct rpc_cred      *so_cred;   /* Associated cred */
 109
 110         spinlock_t           so_lock;
 111         atomic_t             so_count;
 112         unsigned long        so_flags;
 113         struct list_head     so_states;
 114         struct nfs_seqid_counter so_seqid;
 115         seqcount_t           so_reclaim_seqcount;
 116         struct mutex         so_delegreturn_mutex;
 117 };
 118
 119 enum {
 120         NFS_OWNER_RECLAIM_REBOOT,
 121         NFS_OWNER_RECLAIM_NOGRACE
 122 };
 123
 124 #define NFS_LOCK_NEW            0
 125 #define NFS_LOCK_RECLAIM        1
 126 #define NFS_LOCK_EXPIRED        2
 127
 128 /*
 129  * struct nfs4_state maintains the client-side state for a given
 130  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 131  *
 132  * OPEN:
 133  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 134  * we need to know how many files are open for reading or writing on a
 135  * given inode. This information too is stored here.
 136  *
 137  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 138  */
 139
 140 struct nfs4_lock_state {
 141         struct list_head        ls_locks;       /* Other lock stateids */
 142         struct nfs4_state *     ls_state;       /* Pointer to open state */
 143 #define NFS_LOCK_INITIALIZED 0
 144 #define NFS_LOCK_LOST        1
 145         unsigned long           ls_flags;
 146         struct nfs_seqid_counter        ls_seqid;
 147         nfs4_stateid            ls_stateid;
 148         refcount_t              ls_count;
 149         fl_owner_t              ls_owner;
 150 };
 151
 152 /* bits for nfs4_state->flags */
 153 enum {
 154         LK_STATE_IN_USE,
 155         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 156         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 157         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 158         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 159         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 160         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 161         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 162         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 163         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 164         NFS_STATE_MAY_NOTIFY_LOCK,      /* server may CB_NOTIFY_LOCK */
 165         NFS_STATE_CHANGE_WAIT,          /* A state changing operation is outstanding */
 166 };
 167
 168 struct nfs4_state {
 169         struct list_head open_states;   /* List of states for the same state_owner */
 170         struct list_head inode_states;  /* List of states for the same inode */
 171         struct list_head lock_states;   /* List of subservient lock stateids */
 172
 173         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 174         struct inode *inode;            /* Pointer to the inode */
 175
 176         unsigned long flags;            /* Do we hold any locks? */
 177         spinlock_t state_lock;          /* Protects the lock_states list */
 178
 179         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 180         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 181         nfs4_stateid open_stateid;      /* OPEN stateid */
 182
 183         /* The following 3 fields are protected by owner->so_lock */
 184         unsigned int n_rdonly;          /* Number of read-only references */
 185         unsigned int n_wronly;          /* Number of write-only references */
 186         unsigned int n_rdwr;            /* Number of read/write references */
 187         fmode_t state;                  /* State on the server (R,W, or RW) */
 188         atomic_t count;
 189
 190         wait_queue_head_t waitq;
 191 };
 192
 193
 194 struct nfs4_exception {
 195         struct nfs4_state *state;
 196         struct inode *inode;
 197         nfs4_stateid *stateid;
 198         long timeout;
 199         unsigned char delay : 1,
 200                       recovering : 1,
 201                       retry : 1;
 202 };
 203
 204 struct nfs4_state_recovery_ops {
 205         int owner_flag_bit;
 206         int state_flag_bit;
 207         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 208         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 209         int (*establish_clid)(struct nfs_client *, struct rpc_cred *);
 210         int (*reclaim_complete)(struct nfs_client *, struct rpc_cred *);
 211         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 212                 struct rpc_cred *);
 213 };
 214
 215 struct nfs4_opendata {
 216         struct kref kref;
 217         struct nfs_openargs o_arg;
 218         struct nfs_openres o_res;
 219         struct nfs_open_confirmargs c_arg;
 220         struct nfs_open_confirmres c_res;
 221         struct nfs4_string owner_name;
 222         struct nfs4_string group_name;
 223         struct nfs4_label *a_label;
 224         struct nfs_fattr f_attr;
 225         struct nfs4_label *f_label;
 226         struct dentry *dir;
 227         struct dentry *dentry;
 228         struct nfs4_state_owner *owner;
 229         struct nfs4_state *state;
 230         struct iattr attrs;
 231         struct nfs4_layoutget *lgp;
 232         unsigned long timestamp;
 233         bool rpc_done;
 234         bool file_created;
 235         bool is_recover;
 236         bool cancelled;
 237         int rpc_status;
 238 };
 239
 240 struct nfs4_add_xprt_data {
 241         struct nfs_client       *clp;
 242         struct rpc_cred         *cred;
 243 };
 244
 245 struct nfs4_state_maintenance_ops {
 246         int (*sched_state_renewal)(struct nfs_client *, struct rpc_cred *, unsigned);
 247         struct rpc_cred * (*get_state_renewal_cred_locked)(struct nfs_client *);
 248         int (*renew_lease)(struct nfs_client *, struct rpc_cred *);
 249 };
 250
 251 struct nfs4_mig_recovery_ops {
 252         int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 253                 struct page *, struct rpc_cred *);
 254         int (*fsid_present)(struct inode *, struct rpc_cred *);
 255 };
 256
 257 extern const struct dentry_operations nfs4_dentry_operations;
 258
 259 /* dir.c */
 260 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 261                     unsigned, umode_t, int *);
 262
 263 /* super.c */
 264 extern struct file_system_type nfs4_fs_type;
 265
 266 /* nfs4namespace.c */
 267 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 268                                          const struct qstr *);
 269 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 270                                struct nfs_fh *, struct nfs_fattr *);
 271 int nfs4_replace_transport(struct nfs_server *server,
 272                                 const struct nfs4_fs_locations *locations);
 273
 274 /* nfs4proc.c */
 275 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 276 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 277                           struct rpc_message *, struct nfs4_sequence_args *,
 278                           struct nfs4_sequence_res *, int);
 279 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 280 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
 281 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
 282 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 283 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, struct rpc_cred *cred);
 284 extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
 285 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 286 extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
 287 extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
 288 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 289 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 290 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 291                                   struct nfs4_fs_locations *, struct page *);
 292 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 293                 struct page *page, struct rpc_cred *);
 294 extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
 295 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
 296                             struct nfs_fh *, struct nfs_fattr *);
 297 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 298 extern const struct xattr_handler *nfs4_xattr_handlers[];
 299 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 300                 const struct nfs_open_context *ctx,
 301                 const struct nfs_lock_context *l_ctx,
 302                 fmode_t fmode);
 303
 304 #if defined(CONFIG_NFS_V4_1)
 305 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 306 extern int nfs4_proc_create_session(struct nfs_client *, struct rpc_cred *);
 307 extern int nfs4_proc_destroy_session(struct nfs4_session *, struct rpc_cred *);
 308 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 309                 struct nfs_fsinfo *fsinfo);
 310 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 311                                   bool sync);
 312 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 313                 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 314
 315 static inline bool
 316 is_ds_only_client(struct nfs_client *clp)
 317 {
 318         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 319                 EXCHGID4_FLAG_USE_PNFS_DS;
 320 }
 321
 322 static inline bool
 323 is_ds_client(struct nfs_client *clp)
 324 {
 325         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 326 }
 327
 328 static inline bool
 329 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 330                     struct rpc_clnt **clntp, struct rpc_message *msg)
 331 {
 332         struct rpc_cred *newcred = NULL;
 333         rpc_authflavor_t flavor;
 334
 335         if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 336             sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 337                 /* Using machine creds for cleanup operations
 338                  * is only relevent if the client credentials
 339                  * might expire. So don't bother for
 340                  * RPC_AUTH_UNIX.  If file was only exported to
 341                  * sec=sys, the PUTFH would fail anyway.
 342                  */
 343                 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 344                         return false;
 345         }
 346         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 347                 spin_lock(&clp->cl_lock);
 348                 if (clp->cl_machine_cred != NULL)
 349                         /* don't call get_rpccred on the machine cred -
 350                          * a reference will be held for life of clp */
 351                         newcred = clp->cl_machine_cred;
 352                 spin_unlock(&clp->cl_lock);
 353                 msg->rpc_cred = newcred;
 354
 355                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 356                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 357                              flavor != RPC_AUTH_GSS_KRB5P);
 358                 *clntp = clp->cl_rpcclient;
 359
 360                 return true;
 361         }
 362         return false;
 363 }
 364
 365 /*
 366  * Function responsible for determining if an rpc_message should use the
 367  * machine cred under SP4_MACH_CRED and if so switching the credential and
 368  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 369  * Should be called before rpc_call_sync/rpc_call_async.
 370  */
 371 static inline void
 372 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 373                    struct rpc_clnt **clntp, struct rpc_message *msg)
 374 {
 375         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 376 }
 377
 378 /*
 379  * Special wrapper to nfs4_state_protect for write.
 380  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 381  * that use machine cred use NFS_FILE_SYNC.
 382  */
 383 static inline void
 384 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 385                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 386 {
 387         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 388             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 389                 hdr->args.stable = NFS_FILE_SYNC;
 390 }
 391 #else /* CONFIG_NFS_v4_1 */
 392 static inline bool
 393 is_ds_only_client(struct nfs_client *clp)
 394 {
 395         return false;
 396 }
 397
 398 static inline bool
 399 is_ds_client(struct nfs_client *clp)
 400 {
 401         return false;
 402 }
 403
 404 static inline void
 405 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 406                    struct rpc_clnt **clntp, struct rpc_message *msg)
 407 {
 408 }
 409
 410 static inline void
 411 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 412                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 413 {
 414 }
 415 #endif /* CONFIG_NFS_V4_1 */
 416
 417 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 418
 419 extern const u32 nfs4_fattr_bitmap[3];
 420 extern const u32 nfs4_statfs_bitmap[3];
 421 extern const u32 nfs4_pathconf_bitmap[3];
 422 extern const u32 nfs4_fsinfo_bitmap[3];
 423 extern const u32 nfs4_fs_locations_bitmap[3];
 424
 425 void nfs40_shutdown_client(struct nfs_client *);
 426 void nfs41_shutdown_client(struct nfs_client *);
 427 int nfs40_init_client(struct nfs_client *);
 428 int nfs41_init_client(struct nfs_client *);
 429 void nfs4_free_client(struct nfs_client *);
 430
 431 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 432
 433 /* nfs4renewd.c */
 434 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 435 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 436 extern void nfs4_kill_renewd(struct nfs_client *);
 437 extern void nfs4_renew_state(struct work_struct *);
 438 extern void nfs4_set_lease_period(struct nfs_client *clp,
 439                 unsigned long lease,
 440                 unsigned long lastrenewed);
 441
 442
 443 /* nfs4state.c */
 444 struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp);
 445 struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp);
 446 struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp);
 447 int nfs4_discover_server_trunking(struct nfs_client *clp,
 448                         struct nfs_client **);
 449 int nfs40_discover_server_trunking(struct nfs_client *clp,
 450                         struct nfs_client **, struct rpc_cred *);
 451 #if defined(CONFIG_NFS_V4_1)
 452 int nfs41_discover_server_trunking(struct nfs_client *clp,
 453                         struct nfs_client **, struct rpc_cred *);
 454 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 455 extern void nfs41_notify_server(struct nfs_client *);
 456 #else
 457 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 458 {
 459 }
 460 #endif /* CONFIG_NFS_V4_1 */
 461
 462 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, struct rpc_cred *, gfp_t);
 463 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 464 extern void nfs4_purge_state_owners(struct nfs_server *);
 465 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 466 extern void nfs4_put_open_state(struct nfs4_state *);
 467 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 468 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 469 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 470 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 471                 const nfs4_stateid *stateid);
 472 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 473 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 474 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 475 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 476 extern void nfs4_schedule_state_manager(struct nfs_client *);
 477 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 478 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 479 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 480 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 481 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 482 extern void nfs41_handle_server_scope(struct nfs_client *,
 483                                       struct nfs41_server_scope **);
 484 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 485 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 486 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 487                 const struct nfs_lock_context *, nfs4_stateid *,
 488                 struct rpc_cred **);
 489 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
 490                 struct nfs4_state *state);
 491 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 492                 struct nfs4_state *state);
 493
 494 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 495 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 496 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 497 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 498 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 499 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 500 extern int nfs4_setup_sequence(struct nfs_client *client,
 501                                 struct nfs4_sequence_args *args,
 502                                 struct nfs4_sequence_res *res,
 503                                 struct rpc_task *task);
 504 extern int nfs4_sequence_done(struct rpc_task *task,
 505                               struct nfs4_sequence_res *res);
 506
 507 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 508
 509 extern const nfs4_stateid zero_stateid;
 510 extern const nfs4_stateid invalid_stateid;
 511
 512 /* nfs4super.c */
 513 struct nfs_mount_info;
 514 extern struct nfs_subversion nfs_v4;
 515 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 516 extern bool nfs4_disable_idmapping;
 517 extern unsigned short max_session_slots;
 518 extern unsigned short max_session_cb_slots;
 519 extern unsigned short send_implementation_id;
 520 extern bool recover_lost_locks;
 521
 522 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 523 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 524
 525 /* nfs4sysctl.c */
 526 #ifdef CONFIG_SYSCTL
 527 int nfs4_register_sysctl(void);
 528 void nfs4_unregister_sysctl(void);
 529 #else
 530 static inline int nfs4_register_sysctl(void)
 531 {
 532         return 0;
 533 }
 534
 535 static inline void nfs4_unregister_sysctl(void)
 536 {
 537 }
 538 #endif
 539
 540 /* nfs4xdr.c */
 541 extern const struct rpc_procinfo nfs4_procedures[];
 542
 543 struct nfs4_mount_data;
 544
 545 /* callback_xdr.c */
 546 extern const struct svc_version nfs4_callback_version1;
 547 extern const struct svc_version nfs4_callback_version4;
 548
 549 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 550 {
 551         memcpy(dst->data, src->data, sizeof(dst->data));
 552         dst->type = src->type;
 553 }
 554
 555 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 556 {
 557         if (dst->type != src->type)
 558                 return false;
 559         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 560 }
 561
 562 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 563 {
 564         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 565 }
 566
 567 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 568 {
 569         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 570 }
 571
 572 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 573 {
 574         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 575 }
 576
 577 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 578                 const nfs4_stateid *stateid)
 579 {
 580         return test_bit(NFS_OPEN_STATE, &state->flags) &&
 581                 nfs4_stateid_match_other(&state->open_stateid, stateid);
 582 }
 583
 584 #else
 585
 586 #define nfs4_close_state(a, b) do { } while (0)
 587 #define nfs4_close_sync(a, b) do { } while (0)
 588 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 589 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 590
 591 #endif /* CONFIG_NFS_V4 */
 592 #endif /* __LINUX_FS_NFS_NFS4_FS.H */