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 *, 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
  78 struct 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
  88 struct nfs_seqid {
  89         struct nfs_seqid_counter *sequence;
  90         struct list_head list;
  91         struct rpc_task *task;
  92 };
  93
  94 static 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  */
 105 struct 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
 122 enum {
 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
 143 struct 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 */
 156 enum {
 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 #ifdef CONFIG_NFS_V4_2
 170         NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
 171 #endif /* CONFIG_NFS_V4_2 */
 172 };
 173
 174 struct 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
 201 struct 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
 212 struct 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
 223 struct 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
 248 struct nfs4_add_xprt_data {
 249         struct nfs_client       *clp;
 250         const struct cred       *cred;
 251 };
 252
 253 struct 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
 259 struct 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
 265 extern const struct dentry_operations nfs4_dentry_operations;
 266
 267 /* dir.c */
 268 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 269                     unsigned, umode_t);
 270
 271 /* super.c */
 272 extern struct file_system_type nfs4_fs_type;
 273
 274 /* nfs4namespace.c */
 275 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 276                                          const struct qstr *);
 277 struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
 278                                struct nfs_fh *, struct nfs_fattr *);
 279 int nfs4_replace_transport(struct nfs_server *server,
 280                                 const struct nfs4_fs_locations *locations);
 281
 282 /* nfs4proc.c */
 283 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 284 extern int nfs4_async_handle_error(struct rpc_task *task,
 285                                    struct nfs_server *server,
 286                                    struct nfs4_state *state, long *timeout);
 287 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 288                           struct rpc_message *, struct nfs4_sequence_args *,
 289                           struct nfs4_sequence_res *, int);
 290 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 291 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 292 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 293 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 294 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 295 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 296 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 297 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 298 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 299 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 300 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 301 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 302                                   struct nfs4_fs_locations *, struct page *);
 303 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 304                 struct page *page, const struct cred *);
 305 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 306 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, const struct qstr *,
 307                             struct nfs_fh *, struct nfs_fattr *);
 308 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 309 extern const struct xattr_handler *nfs4_xattr_handlers[];
 310 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 311                 const struct nfs_open_context *ctx,
 312                 const struct nfs_lock_context *l_ctx,
 313                 fmode_t fmode);
 314
 315 #if defined(CONFIG_NFS_V4_1)
 316 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 317 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 318 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 319 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 320                 struct nfs_fsinfo *fsinfo);
 321 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 322                                   bool sync);
 323 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 324                 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 325
 326 static inline bool
 327 is_ds_only_client(struct nfs_client *clp)
 328 {
 329         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 330                 EXCHGID4_FLAG_USE_PNFS_DS;
 331 }
 332
 333 static inline bool
 334 is_ds_client(struct nfs_client *clp)
 335 {
 336         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 337 }
 338
 339 static inline bool
 340 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 341                     struct rpc_clnt **clntp, struct rpc_message *msg)
 342 {
 343         rpc_authflavor_t flavor;
 344
 345         if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 346             sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 347                 /* Using machine creds for cleanup operations
 348                  * is only relevent if the client credentials
 349                  * might expire. So don't bother for
 350                  * RPC_AUTH_UNIX.  If file was only exported to
 351                  * sec=sys, the PUTFH would fail anyway.
 352                  */
 353                 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 354                         return false;
 355         }
 356         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 357                 msg->rpc_cred = rpc_machine_cred();
 358
 359                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 360                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 361                              flavor != RPC_AUTH_GSS_KRB5P);
 362                 *clntp = clp->cl_rpcclient;
 363
 364                 return true;
 365         }
 366         return false;
 367 }
 368
 369 /*
 370  * Function responsible for determining if an rpc_message should use the
 371  * machine cred under SP4_MACH_CRED and if so switching the credential and
 372  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 373  * Should be called before rpc_call_sync/rpc_call_async.
 374  */
 375 static inline void
 376 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 377                    struct rpc_clnt **clntp, struct rpc_message *msg)
 378 {
 379         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 380 }
 381
 382 /*
 383  * Special wrapper to nfs4_state_protect for write.
 384  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 385  * that use machine cred use NFS_FILE_SYNC.
 386  */
 387 static inline void
 388 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 389                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 390 {
 391         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 392             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 393                 hdr->args.stable = NFS_FILE_SYNC;
 394 }
 395 #else /* CONFIG_NFS_v4_1 */
 396 static inline bool
 397 is_ds_only_client(struct nfs_client *clp)
 398 {
 399         return false;
 400 }
 401
 402 static inline bool
 403 is_ds_client(struct nfs_client *clp)
 404 {
 405         return false;
 406 }
 407
 408 static inline void
 409 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 410                    struct rpc_clnt **clntp, struct rpc_message *msg)
 411 {
 412 }
 413
 414 static inline void
 415 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 416                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 417 {
 418 }
 419 #endif /* CONFIG_NFS_V4_1 */
 420
 421 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 422
 423 extern const u32 nfs4_fattr_bitmap[3];
 424 extern const u32 nfs4_statfs_bitmap[3];
 425 extern const u32 nfs4_pathconf_bitmap[3];
 426 extern const u32 nfs4_fsinfo_bitmap[3];
 427 extern const u32 nfs4_fs_locations_bitmap[3];
 428
 429 void nfs40_shutdown_client(struct nfs_client *);
 430 void nfs41_shutdown_client(struct nfs_client *);
 431 int nfs40_init_client(struct nfs_client *);
 432 int nfs41_init_client(struct nfs_client *);
 433 void nfs4_free_client(struct nfs_client *);
 434
 435 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 436
 437 /* nfs4renewd.c */
 438 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 439 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 440 extern void nfs4_kill_renewd(struct nfs_client *);
 441 extern void nfs4_renew_state(struct work_struct *);
 442 extern void nfs4_set_lease_period(struct nfs_client *clp,
 443                 unsigned long lease,
 444                 unsigned long lastrenewed);
 445
 446
 447 /* nfs4state.c */
 448 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 449 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 450 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 451 int nfs4_discover_server_trunking(struct nfs_client *clp,
 452                         struct nfs_client **);
 453 int nfs40_discover_server_trunking(struct nfs_client *clp,
 454                         struct nfs_client **, const struct cred *);
 455 #if defined(CONFIG_NFS_V4_1)
 456 int nfs41_discover_server_trunking(struct nfs_client *clp,
 457                         struct nfs_client **, const struct cred *);
 458 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 459 extern void nfs41_notify_server(struct nfs_client *);
 460 #else
 461 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 462 {
 463 }
 464 #endif /* CONFIG_NFS_V4_1 */
 465
 466 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 467 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 468 extern void nfs4_purge_state_owners(struct nfs_server *);
 469 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 470 extern void nfs4_put_open_state(struct nfs4_state *);
 471 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 472 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 473 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 474 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 475                 const nfs4_stateid *stateid);
 476 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 477 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 478 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 479 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 480 extern void nfs4_schedule_state_manager(struct nfs_client *);
 481 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 482 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 483 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 484 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 485 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 486 extern void nfs41_handle_server_scope(struct nfs_client *,
 487                                       struct nfs41_server_scope **);
 488 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 489 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 490 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 491                 const struct nfs_lock_context *, nfs4_stateid *,
 492                 const struct cred **);
 493 extern bool nfs4_refresh_open_stateid(nfs4_stateid *dst,
 494                 struct nfs4_state *state);
 495 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 496                 struct nfs4_state *state);
 497
 498 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 499 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 500 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 501 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 502 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 503 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 504 extern int nfs4_setup_sequence(struct nfs_client *client,
 505                                 struct nfs4_sequence_args *args,
 506                                 struct nfs4_sequence_res *res,
 507                                 struct rpc_task *task);
 508 extern int nfs4_sequence_done(struct rpc_task *task,
 509                               struct nfs4_sequence_res *res);
 510
 511 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 512 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 513 extern const nfs4_stateid zero_stateid;
 514 extern const nfs4_stateid invalid_stateid;
 515
 516 /* nfs4super.c */
 517 struct nfs_mount_info;
 518 extern struct nfs_subversion nfs_v4;
 519 struct dentry *nfs4_try_mount(int, const char *, struct nfs_mount_info *, struct nfs_subversion *);
 520 extern bool nfs4_disable_idmapping;
 521 extern unsigned short max_session_slots;
 522 extern unsigned short max_session_cb_slots;
 523 extern unsigned short send_implementation_id;
 524 extern bool recover_lost_locks;
 525
 526 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 527 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 528
 529 /* nfs4sysctl.c */
 530 #ifdef CONFIG_SYSCTL
 531 int nfs4_register_sysctl(void);
 532 void nfs4_unregister_sysctl(void);
 533 #else
 534 static inline int nfs4_register_sysctl(void)
 535 {
 536         return 0;
 537 }
 538
 539 static inline void nfs4_unregister_sysctl(void)
 540 {
 541 }
 542 #endif
 543
 544 /* nfs4xdr.c */
 545 extern const struct rpc_procinfo nfs4_procedures[];
 546
 547 struct nfs4_mount_data;
 548
 549 /* callback_xdr.c */
 550 extern const struct svc_version nfs4_callback_version1;
 551 extern const struct svc_version nfs4_callback_version4;
 552
 553 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 554 {
 555         memcpy(dst->data, src->data, sizeof(dst->data));
 556         dst->type = src->type;
 557 }
 558
 559 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 560 {
 561         if (dst->type != src->type)
 562                 return false;
 563         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 564 }
 565
 566 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 567 {
 568         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 569 }
 570
 571 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 572 {
 573         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 574 }
 575
 576 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 577 {
 578         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 579 }
 580
 581 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 582                 const nfs4_stateid *stateid)
 583 {
 584         return test_bit(NFS_OPEN_STATE, &state->flags) &&
 585                 nfs4_stateid_match_other(&state->open_stateid, stateid);
 586 }
 587
 588 #else
 589
 590 #define nfs4_close_state(a, b) do { } while (0)
 591 #define nfs4_close_sync(a, b) do { } while (0)
 592 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 593 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 594
 595 #endif /* CONFIG_NFS_V4 */
 596 #endif /* __LINUX_FS_NFS_NFS4_FS.H */