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_RECALL_RUNNING,
  46         NFS4CLNT_RECALL_ANY_LAYOUT_READ,
  47         NFS4CLNT_RECALL_ANY_LAYOUT_RW,
  48 };
  49
  50 #define NFS4_RENEW_TIMEOUT              0x01
  51 #define NFS4_RENEW_DELEGATION_CB        0x02
  52
  53 struct nfs_seqid_counter;
  54 struct nfs4_minor_version_ops {
  55         u32     minor_version;
  56         unsigned init_caps;
  57
  58         int     (*init_client)(struct nfs_client *);
  59         void    (*shutdown_client)(struct nfs_client *);
  60         bool    (*match_stateid)(const nfs4_stateid *,
  61                         const nfs4_stateid *);
  62         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  63                         struct nfs_fsinfo *);
  64         void    (*free_lock_state)(struct nfs_server *,
  65                         struct nfs4_lock_state *);
  66         int     (*test_and_free_expired)(struct nfs_server *,
  67                         nfs4_stateid *, const struct cred *);
  68         struct nfs_seqid *
  69                 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  70         void    (*session_trunk)(struct rpc_clnt *clnt,
  71                         struct rpc_xprt *xprt, void *data);
  72         const struct rpc_call_ops *call_sync_ops;
  73         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  74         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  75         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  76         const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  77 };
  78
  79 #define NFS_SEQID_CONFIRMED 1
  80 struct nfs_seqid_counter {
  81         ktime_t create_time;
  82         int owner_id;
  83         int flags;
  84         u32 counter;
  85         spinlock_t lock;                /* Protects the list */
  86         struct list_head list;          /* Defines sequence of RPC calls */
  87         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  88 };
  89
  90 struct nfs_seqid {
  91         struct nfs_seqid_counter *sequence;
  92         struct list_head list;
  93         struct rpc_task *task;
  94 };
  95
  96 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  97 {
  98         if (seqid_mutating_err(-status))
  99                 seqid->flags |= NFS_SEQID_CONFIRMED;
 100 }
 101
 102 /*
 103  * NFS4 state_owners and lock_owners are simply labels for ordered
 104  * sequences of RPC calls. Their sole purpose is to provide once-only
 105  * semantics by allowing the server to identify replayed requests.
 106  */
 107 struct nfs4_state_owner {
 108         struct nfs_server    *so_server;
 109         struct list_head     so_lru;
 110         unsigned long        so_expires;
 111         struct rb_node       so_server_node;
 112
 113         const struct cred    *so_cred;   /* Associated cred */
 114
 115         spinlock_t           so_lock;
 116         atomic_t             so_count;
 117         unsigned long        so_flags;
 118         struct list_head     so_states;
 119         struct nfs_seqid_counter so_seqid;
 120         seqcount_spinlock_t  so_reclaim_seqcount;
 121         struct mutex         so_delegreturn_mutex;
 122 };
 123
 124 enum {
 125         NFS_OWNER_RECLAIM_REBOOT,
 126         NFS_OWNER_RECLAIM_NOGRACE
 127 };
 128
 129 #define NFS_LOCK_NEW            0
 130 #define NFS_LOCK_RECLAIM        1
 131 #define NFS_LOCK_EXPIRED        2
 132
 133 /*
 134  * struct nfs4_state maintains the client-side state for a given
 135  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 136  *
 137  * OPEN:
 138  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 139  * we need to know how many files are open for reading or writing on a
 140  * given inode. This information too is stored here.
 141  *
 142  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 143  */
 144
 145 struct nfs4_lock_state {
 146         struct list_head        ls_locks;       /* Other lock stateids */
 147         struct nfs4_state *     ls_state;       /* Pointer to open state */
 148 #define NFS_LOCK_INITIALIZED 0
 149 #define NFS_LOCK_LOST        1
 150         unsigned long           ls_flags;
 151         struct nfs_seqid_counter        ls_seqid;
 152         nfs4_stateid            ls_stateid;
 153         refcount_t              ls_count;
 154         fl_owner_t              ls_owner;
 155 };
 156
 157 /* bits for nfs4_state->flags */
 158 enum {
 159         LK_STATE_IN_USE,
 160         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 161         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 162         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 163         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 164         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 165         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 166         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 167         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 168         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 169         NFS_STATE_MAY_NOTIFY_LOCK,      /* server may CB_NOTIFY_LOCK */
 170         NFS_STATE_CHANGE_WAIT,          /* A state changing operation is outstanding */
 171         NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
 172         NFS_CLNT_SRC_SSC_COPY_STATE,    /* src server open state on client*/
 173         NFS_SRV_SSC_COPY_STATE,         /* ssc state on the dst server */
 174 };
 175
 176 struct nfs4_state {
 177         struct list_head open_states;   /* List of states for the same state_owner */
 178         struct list_head inode_states;  /* List of states for the same inode */
 179         struct list_head lock_states;   /* List of subservient lock stateids */
 180
 181         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 182         struct inode *inode;            /* Pointer to the inode */
 183
 184         unsigned long flags;            /* Do we hold any locks? */
 185         spinlock_t state_lock;          /* Protects the lock_states list */
 186
 187         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 188         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 189         nfs4_stateid open_stateid;      /* OPEN stateid */
 190
 191         /* The following 3 fields are protected by owner->so_lock */
 192         unsigned int n_rdonly;          /* Number of read-only references */
 193         unsigned int n_wronly;          /* Number of write-only references */
 194         unsigned int n_rdwr;            /* Number of read/write references */
 195         fmode_t state;                  /* State on the server (R,W, or RW) */
 196         refcount_t count;
 197
 198         wait_queue_head_t waitq;
 199         struct rcu_head rcu_head;
 200 };
 201
 202
 203 struct nfs4_exception {
 204         struct nfs4_state *state;
 205         struct inode *inode;
 206         nfs4_stateid *stateid;
 207         long timeout;
 208         unsigned char delay : 1,
 209                       recovering : 1,
 210                       retry : 1;
 211         bool interruptible;
 212 };
 213
 214 struct nfs4_state_recovery_ops {
 215         int owner_flag_bit;
 216         int state_flag_bit;
 217         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 218         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 219         int (*establish_clid)(struct nfs_client *, const struct cred *);
 220         int (*reclaim_complete)(struct nfs_client *, const struct cred *);
 221         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 222                 const struct cred *);
 223 };
 224
 225 struct nfs4_opendata {
 226         struct kref kref;
 227         struct nfs_openargs o_arg;
 228         struct nfs_openres o_res;
 229         struct nfs_open_confirmargs c_arg;
 230         struct nfs_open_confirmres c_res;
 231         struct nfs4_string owner_name;
 232         struct nfs4_string group_name;
 233         struct nfs4_label *a_label;
 234         struct nfs_fattr f_attr;
 235         struct nfs4_label *f_label;
 236         struct dentry *dir;
 237         struct dentry *dentry;
 238         struct nfs4_state_owner *owner;
 239         struct nfs4_state *state;
 240         struct iattr attrs;
 241         struct nfs4_layoutget *lgp;
 242         unsigned long timestamp;
 243         bool rpc_done;
 244         bool file_created;
 245         bool is_recover;
 246         bool cancelled;
 247         int rpc_status;
 248 };
 249
 250 struct nfs4_add_xprt_data {
 251         struct nfs_client       *clp;
 252         const struct cred       *cred;
 253 };
 254
 255 struct nfs4_state_maintenance_ops {
 256         int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
 257         const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
 258         int (*renew_lease)(struct nfs_client *, const struct cred *);
 259 };
 260
 261 struct nfs4_mig_recovery_ops {
 262         int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 263                 struct page *, const struct cred *);
 264         int (*fsid_present)(struct inode *, const struct cred *);
 265 };
 266
 267 extern const struct dentry_operations nfs4_dentry_operations;
 268
 269 /* dir.c */
 270 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 271                     unsigned, umode_t);
 272
 273 /* fs_context.c */
 274 extern struct file_system_type nfs4_fs_type;
 275
 276 /* nfs4namespace.c */
 277 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 278                                          const struct qstr *);
 279 int nfs4_submount(struct fs_context *, struct nfs_server *);
 280 int nfs4_replace_transport(struct nfs_server *server,
 281                                 const struct nfs4_fs_locations *locations);
 282
 283 /* nfs4proc.c */
 284 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 285 extern int nfs4_async_handle_error(struct rpc_task *task,
 286                                    struct nfs_server *server,
 287                                    struct nfs4_state *state, long *timeout);
 288 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 289                           struct rpc_message *, struct nfs4_sequence_args *,
 290                           struct nfs4_sequence_res *, int);
 291 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 292 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 293 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 294 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 295 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 296 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 297 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 298 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 299 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 300 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 301 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 302 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 303                                   struct nfs4_fs_locations *, struct page *);
 304 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 305                 struct page *page, const struct cred *);
 306 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 307 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
 308                                                     struct dentry *,
 309                                                     struct nfs_fh *,
 310                                                     struct nfs_fattr *);
 311 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 312 extern const struct xattr_handler *nfs4_xattr_handlers[];
 313 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 314                 const struct nfs_open_context *ctx,
 315                 const struct nfs_lock_context *l_ctx,
 316                 fmode_t fmode);
 317 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 318                              struct nfs_fattr *fattr, struct nfs4_label *label,
 319                              struct inode *inode);
 320 extern int update_open_stateid(struct nfs4_state *state,
 321                                 const nfs4_stateid *open_stateid,
 322                                 const nfs4_stateid *deleg_stateid,
 323                                 fmode_t fmode);
 324
 325 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 326                 struct nfs_fsinfo *fsinfo);
 327 extern void nfs4_update_changeattr(struct inode *dir,
 328                                    struct nfs4_change_info *cinfo,
 329                                    unsigned long timestamp,
 330                                    unsigned long cache_validity);
 331 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
 332                                     struct page **pages);
 333
 334 #if defined(CONFIG_NFS_V4_1)
 335 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 336 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 337 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 338 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 339                                   bool sync);
 340 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 341                 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 342
 343 static inline bool
 344 is_ds_only_client(struct nfs_client *clp)
 345 {
 346         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 347                 EXCHGID4_FLAG_USE_PNFS_DS;
 348 }
 349
 350 static inline bool
 351 is_ds_client(struct nfs_client *clp)
 352 {
 353         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 354 }
 355
 356 static inline bool
 357 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 358                     struct rpc_clnt **clntp, struct rpc_message *msg)
 359 {
 360         rpc_authflavor_t flavor;
 361
 362         if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 363             sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 364                 /* Using machine creds for cleanup operations
 365                  * is only relevent if the client credentials
 366                  * might expire. So don't bother for
 367                  * RPC_AUTH_UNIX.  If file was only exported to
 368                  * sec=sys, the PUTFH would fail anyway.
 369                  */
 370                 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 371                         return false;
 372         }
 373         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 374                 msg->rpc_cred = rpc_machine_cred();
 375
 376                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 377                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 378                              flavor != RPC_AUTH_GSS_KRB5P);
 379                 *clntp = clp->cl_rpcclient;
 380
 381                 return true;
 382         }
 383         return false;
 384 }
 385
 386 /*
 387  * Function responsible for determining if an rpc_message should use the
 388  * machine cred under SP4_MACH_CRED and if so switching the credential and
 389  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 390  * Should be called before rpc_call_sync/rpc_call_async.
 391  */
 392 static inline void
 393 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 394                    struct rpc_clnt **clntp, struct rpc_message *msg)
 395 {
 396         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 397 }
 398
 399 /*
 400  * Special wrapper to nfs4_state_protect for write.
 401  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 402  * that use machine cred use NFS_FILE_SYNC.
 403  */
 404 static inline void
 405 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 406                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 407 {
 408         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 409             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 410                 hdr->args.stable = NFS_FILE_SYNC;
 411 }
 412 #else /* CONFIG_NFS_v4_1 */
 413 static inline bool
 414 is_ds_only_client(struct nfs_client *clp)
 415 {
 416         return false;
 417 }
 418
 419 static inline bool
 420 is_ds_client(struct nfs_client *clp)
 421 {
 422         return false;
 423 }
 424
 425 static inline void
 426 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 427                    struct rpc_clnt **clntp, struct rpc_message *msg)
 428 {
 429 }
 430
 431 static inline void
 432 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 433                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 434 {
 435 }
 436 #endif /* CONFIG_NFS_V4_1 */
 437
 438 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 439
 440 extern const u32 nfs4_fattr_bitmap[3];
 441 extern const u32 nfs4_statfs_bitmap[3];
 442 extern const u32 nfs4_pathconf_bitmap[3];
 443 extern const u32 nfs4_fsinfo_bitmap[3];
 444 extern const u32 nfs4_fs_locations_bitmap[3];
 445
 446 void nfs40_shutdown_client(struct nfs_client *);
 447 void nfs41_shutdown_client(struct nfs_client *);
 448 int nfs40_init_client(struct nfs_client *);
 449 int nfs41_init_client(struct nfs_client *);
 450 void nfs4_free_client(struct nfs_client *);
 451
 452 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 453
 454 /* nfs4renewd.c */
 455 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 456 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 457 extern void nfs4_kill_renewd(struct nfs_client *);
 458 extern void nfs4_renew_state(struct work_struct *);
 459 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 460
 461
 462 /* nfs4state.c */
 463 extern const nfs4_stateid current_stateid;
 464
 465 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 466 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 467 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 468 int nfs4_discover_server_trunking(struct nfs_client *clp,
 469                         struct nfs_client **);
 470 int nfs40_discover_server_trunking(struct nfs_client *clp,
 471                         struct nfs_client **, const struct cred *);
 472 #if defined(CONFIG_NFS_V4_1)
 473 int nfs41_discover_server_trunking(struct nfs_client *clp,
 474                         struct nfs_client **, const struct cred *);
 475 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 476 extern void nfs41_notify_server(struct nfs_client *);
 477 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 478                         struct nfs41_server_owner *o2);
 479 #else
 480 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 481 {
 482 }
 483 #endif /* CONFIG_NFS_V4_1 */
 484
 485 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 486 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 487 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 488 extern void nfs4_free_state_owners(struct list_head *head);
 489 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 490 extern void nfs4_put_open_state(struct nfs4_state *);
 491 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 492 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 493 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 494 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 495                 const nfs4_stateid *stateid);
 496 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 497 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 498 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 499 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 500 extern void nfs4_schedule_state_manager(struct nfs_client *);
 501 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 502 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 503 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 504 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 505 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 506 extern void nfs41_handle_server_scope(struct nfs_client *,
 507                                       struct nfs41_server_scope **);
 508 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 509 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 510 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 511                 const struct nfs_lock_context *, nfs4_stateid *,
 512                 const struct cred **);
 513 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 514                 struct nfs4_state *state);
 515
 516 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 517 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 518 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 519 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 520 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 521 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 522 extern int nfs4_setup_sequence(struct nfs_client *client,
 523                                 struct nfs4_sequence_args *args,
 524                                 struct nfs4_sequence_res *res,
 525                                 struct rpc_task *task);
 526 extern int nfs4_sequence_done(struct rpc_task *task,
 527                               struct nfs4_sequence_res *res);
 528
 529 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 530 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 531 extern const nfs4_stateid zero_stateid;
 532 extern const nfs4_stateid invalid_stateid;
 533
 534 /* nfs4super.c */
 535 struct nfs_mount_info;
 536 extern struct nfs_subversion nfs_v4;
 537 extern bool nfs4_disable_idmapping;
 538 extern unsigned short max_session_slots;
 539 extern unsigned short max_session_cb_slots;
 540 extern unsigned short send_implementation_id;
 541 extern bool recover_lost_locks;
 542
 543 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 544 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 545
 546 extern int nfs4_try_get_tree(struct fs_context *);
 547 extern int nfs4_get_referral_tree(struct fs_context *);
 548
 549 /* nfs4sysctl.c */
 550 #ifdef CONFIG_SYSCTL
 551 int nfs4_register_sysctl(void);
 552 void nfs4_unregister_sysctl(void);
 553 #else
 554 static inline int nfs4_register_sysctl(void)
 555 {
 556         return 0;
 557 }
 558
 559 static inline void nfs4_unregister_sysctl(void)
 560 {
 561 }
 562 #endif
 563
 564 /* nfs4xdr.c */
 565 extern const struct rpc_procinfo nfs4_procedures[];
 566
 567 #ifdef CONFIG_NFS_V4_2
 568 extern const u32 nfs42_maxsetxattr_overhead;
 569 extern const u32 nfs42_maxgetxattr_overhead;
 570 extern const u32 nfs42_maxlistxattrs_overhead;
 571 #endif
 572
 573 struct nfs4_mount_data;
 574
 575 /* callback_xdr.c */
 576 extern const struct svc_version nfs4_callback_version1;
 577 extern const struct svc_version nfs4_callback_version4;
 578
 579 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 580 {
 581         memcpy(dst->data, src->data, sizeof(dst->data));
 582         dst->type = src->type;
 583 }
 584
 585 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 586 {
 587         if (dst->type != src->type)
 588                 return false;
 589         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 590 }
 591
 592 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 593 {
 594         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 595 }
 596
 597 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 598 {
 599         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 600 }
 601
 602 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
 603 {
 604         u32 seq1 = be32_to_cpu(s1->seqid);
 605         u32 seq2 = be32_to_cpu(s2->seqid);
 606
 607         return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
 608 }
 609
 610 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
 611 {
 612         return nfs4_stateid_match_other(dst, src) &&
 613                 !(src->seqid && nfs4_stateid_is_newer(dst, src));
 614 }
 615
 616 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
 617 {
 618         u32 seqid = be32_to_cpu(s1->seqid);
 619
 620         if (++seqid == 0)
 621                 ++seqid;
 622         s1->seqid = cpu_to_be32(seqid);
 623 }
 624
 625 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 626 {
 627         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 628 }
 629
 630 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 631                 const nfs4_stateid *stateid)
 632 {
 633         return test_bit(NFS_OPEN_STATE, &state->flags) &&
 634                 nfs4_stateid_match_other(&state->open_stateid, stateid);
 635 }
 636
 637 /* nfs42xattr.c */
 638 #ifdef CONFIG_NFS_V4_2
 639 extern int __init nfs4_xattr_cache_init(void);
 640 extern void nfs4_xattr_cache_exit(void);
 641 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
 642                                  const char *buf, struct page **pages,
 643                                  ssize_t buflen);
 644 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
 645 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
 646                                 char *buf, ssize_t buflen);
 647 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
 648                                       ssize_t buflen);
 649 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
 650                                      ssize_t buflen);
 651 extern void nfs4_xattr_cache_zap(struct inode *inode);
 652 #else
 653 static inline void nfs4_xattr_cache_zap(struct inode *inode)
 654 {
 655 }
 656 #endif /* CONFIG_NFS_V4_2 */
 657
 658 #else /* CONFIG_NFS_V4 */
 659
 660 #define nfs4_close_state(a, b) do { } while (0)
 661 #define nfs4_close_sync(a, b) do { } while (0)
 662 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 663 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 664
 665
 666 #endif /* CONFIG_NFS_V4 */
 667 #endif /* __LINUX_FS_NFS_NFS4_FS.H */