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         NFS4CLNT_DELEGRETURN_DELAYED,
  49 };
  50
  51 #define NFS4_RENEW_TIMEOUT              0x01
  52 #define NFS4_RENEW_DELEGATION_CB        0x02
  53
  54 struct nfs_seqid_counter;
  55 struct nfs4_minor_version_ops {
  56         u32     minor_version;
  57         unsigned init_caps;
  58
  59         int     (*init_client)(struct nfs_client *);
  60         void    (*shutdown_client)(struct nfs_client *);
  61         bool    (*match_stateid)(const nfs4_stateid *,
  62                         const nfs4_stateid *);
  63         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  64                         struct nfs_fsinfo *);
  65         void    (*free_lock_state)(struct nfs_server *,
  66                         struct nfs4_lock_state *);
  67         int     (*test_and_free_expired)(struct nfs_server *,
  68                         nfs4_stateid *, const struct cred *);
  69         struct nfs_seqid *
  70                 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  71         void    (*session_trunk)(struct rpc_clnt *clnt,
  72                         struct rpc_xprt *xprt, void *data);
  73         const struct rpc_call_ops *call_sync_ops;
  74         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  75         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  76         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  77         const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  78 };
  79
  80 #define NFS_SEQID_CONFIRMED 1
  81 struct nfs_seqid_counter {
  82         ktime_t create_time;
  83         int owner_id;
  84         int flags;
  85         u32 counter;
  86         spinlock_t lock;                /* Protects the list */
  87         struct list_head list;          /* Defines sequence of RPC calls */
  88         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  89 };
  90
  91 struct nfs_seqid {
  92         struct nfs_seqid_counter *sequence;
  93         struct list_head list;
  94         struct rpc_task *task;
  95 };
  96
  97 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
  98 {
  99         if (seqid_mutating_err(-status))
 100                 seqid->flags |= NFS_SEQID_CONFIRMED;
 101 }
 102
 103 /*
 104  * NFS4 state_owners and lock_owners are simply labels for ordered
 105  * sequences of RPC calls. Their sole purpose is to provide once-only
 106  * semantics by allowing the server to identify replayed requests.
 107  */
 108 struct nfs4_state_owner {
 109         struct nfs_server    *so_server;
 110         struct list_head     so_lru;
 111         unsigned long        so_expires;
 112         struct rb_node       so_server_node;
 113
 114         const struct cred    *so_cred;   /* Associated cred */
 115
 116         spinlock_t           so_lock;
 117         atomic_t             so_count;
 118         unsigned long        so_flags;
 119         struct list_head     so_states;
 120         struct nfs_seqid_counter so_seqid;
 121         seqcount_spinlock_t  so_reclaim_seqcount;
 122         struct mutex         so_delegreturn_mutex;
 123 };
 124
 125 enum {
 126         NFS_OWNER_RECLAIM_REBOOT,
 127         NFS_OWNER_RECLAIM_NOGRACE
 128 };
 129
 130 #define NFS_LOCK_NEW            0
 131 #define NFS_LOCK_RECLAIM        1
 132 #define NFS_LOCK_EXPIRED        2
 133
 134 /*
 135  * struct nfs4_state maintains the client-side state for a given
 136  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 137  *
 138  * OPEN:
 139  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 140  * we need to know how many files are open for reading or writing on a
 141  * given inode. This information too is stored here.
 142  *
 143  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 144  */
 145
 146 struct nfs4_lock_state {
 147         struct list_head        ls_locks;       /* Other lock stateids */
 148         struct nfs4_state *     ls_state;       /* Pointer to open state */
 149 #define NFS_LOCK_INITIALIZED 0
 150 #define NFS_LOCK_LOST        1
 151         unsigned long           ls_flags;
 152         struct nfs_seqid_counter        ls_seqid;
 153         nfs4_stateid            ls_stateid;
 154         refcount_t              ls_count;
 155         fl_owner_t              ls_owner;
 156 };
 157
 158 /* bits for nfs4_state->flags */
 159 enum {
 160         LK_STATE_IN_USE,
 161         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 162         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 163         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 164         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 165         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 166         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 167         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 168         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 169         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 170         NFS_STATE_MAY_NOTIFY_LOCK,      /* server may CB_NOTIFY_LOCK */
 171         NFS_STATE_CHANGE_WAIT,          /* A state changing operation is outstanding */
 172         NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
 173         NFS_CLNT_SRC_SSC_COPY_STATE,    /* src server open state on client*/
 174         NFS_SRV_SSC_COPY_STATE,         /* ssc state on the dst server */
 175 };
 176
 177 struct nfs4_state {
 178         struct list_head open_states;   /* List of states for the same state_owner */
 179         struct list_head inode_states;  /* List of states for the same inode */
 180         struct list_head lock_states;   /* List of subservient lock stateids */
 181
 182         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 183         struct inode *inode;            /* Pointer to the inode */
 184
 185         unsigned long flags;            /* Do we hold any locks? */
 186         spinlock_t state_lock;          /* Protects the lock_states list */
 187
 188         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 189         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 190         nfs4_stateid open_stateid;      /* OPEN stateid */
 191
 192         /* The following 3 fields are protected by owner->so_lock */
 193         unsigned int n_rdonly;          /* Number of read-only references */
 194         unsigned int n_wronly;          /* Number of write-only references */
 195         unsigned int n_rdwr;            /* Number of read/write references */
 196         fmode_t state;                  /* State on the server (R,W, or RW) */
 197         refcount_t count;
 198
 199         wait_queue_head_t waitq;
 200         struct rcu_head rcu_head;
 201 };
 202
 203
 204 struct nfs4_exception {
 205         struct nfs4_state *state;
 206         struct inode *inode;
 207         nfs4_stateid *stateid;
 208         long timeout;
 209         unsigned char task_is_privileged : 1;
 210         unsigned char delay : 1,
 211                       recovering : 1,
 212                       retry : 1;
 213         bool interruptible;
 214 };
 215
 216 struct nfs4_state_recovery_ops {
 217         int owner_flag_bit;
 218         int state_flag_bit;
 219         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 220         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 221         int (*establish_clid)(struct nfs_client *, const struct cred *);
 222         int (*reclaim_complete)(struct nfs_client *, const struct cred *);
 223         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 224                 const struct cred *);
 225 };
 226
 227 struct nfs4_opendata {
 228         struct kref kref;
 229         struct nfs_openargs o_arg;
 230         struct nfs_openres o_res;
 231         struct nfs_open_confirmargs c_arg;
 232         struct nfs_open_confirmres c_res;
 233         struct nfs4_string owner_name;
 234         struct nfs4_string group_name;
 235         struct nfs4_label *a_label;
 236         struct nfs_fattr f_attr;
 237         struct nfs4_label *f_label;
 238         struct dentry *dir;
 239         struct dentry *dentry;
 240         struct nfs4_state_owner *owner;
 241         struct nfs4_state *state;
 242         struct iattr attrs;
 243         struct nfs4_layoutget *lgp;
 244         unsigned long timestamp;
 245         bool rpc_done;
 246         bool file_created;
 247         bool is_recover;
 248         bool cancelled;
 249         int rpc_status;
 250 };
 251
 252 struct nfs4_add_xprt_data {
 253         struct nfs_client       *clp;
 254         const struct cred       *cred;
 255 };
 256
 257 struct nfs4_state_maintenance_ops {
 258         int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
 259         const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
 260         int (*renew_lease)(struct nfs_client *, const struct cred *);
 261 };
 262
 263 struct nfs4_mig_recovery_ops {
 264         int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
 265                 struct page *, const struct cred *);
 266         int (*fsid_present)(struct inode *, const struct cred *);
 267 };
 268
 269 extern const struct dentry_operations nfs4_dentry_operations;
 270
 271 /* dir.c */
 272 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 273                     unsigned, umode_t);
 274
 275 /* fs_context.c */
 276 extern struct file_system_type nfs4_fs_type;
 277
 278 /* nfs4namespace.c */
 279 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 280                                          const struct qstr *);
 281 int nfs4_submount(struct fs_context *, struct nfs_server *);
 282 int nfs4_replace_transport(struct nfs_server *server,
 283                                 const struct nfs4_fs_locations *locations);
 284
 285 /* nfs4proc.c */
 286 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 287 extern int nfs4_async_handle_error(struct rpc_task *task,
 288                                    struct nfs_server *server,
 289                                    struct nfs4_state *state, long *timeout);
 290 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 291                           struct rpc_message *, struct nfs4_sequence_args *,
 292                           struct nfs4_sequence_res *, int);
 293 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 294 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 295 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 296 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 297 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 298 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 299 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 300 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 301 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 302 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 303 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 304 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 305                                   struct nfs4_fs_locations *, struct page *);
 306 extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 307                 struct page *page, const struct cred *);
 308 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 309 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
 310                                                     struct dentry *,
 311                                                     struct nfs_fh *,
 312                                                     struct nfs_fattr *);
 313 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 314 extern const struct xattr_handler *nfs4_xattr_handlers[];
 315 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 316                 const struct nfs_open_context *ctx,
 317                 const struct nfs_lock_context *l_ctx,
 318                 fmode_t fmode);
 319 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 320                              struct nfs_fattr *fattr, struct nfs4_label *label,
 321                              struct inode *inode);
 322 extern int update_open_stateid(struct nfs4_state *state,
 323                                 const nfs4_stateid *open_stateid,
 324                                 const nfs4_stateid *deleg_stateid,
 325                                 fmode_t fmode);
 326
 327 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 328                 struct nfs_fsinfo *fsinfo);
 329 extern void nfs4_update_changeattr(struct inode *dir,
 330                                    struct nfs4_change_info *cinfo,
 331                                    unsigned long timestamp,
 332                                    unsigned long cache_validity);
 333 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
 334                                     struct page **pages);
 335
 336 #if defined(CONFIG_NFS_V4_1)
 337 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 338 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 339 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 340 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 341                                   bool sync);
 342 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 343                 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 344
 345 static inline bool
 346 is_ds_only_client(struct nfs_client *clp)
 347 {
 348         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 349                 EXCHGID4_FLAG_USE_PNFS_DS;
 350 }
 351
 352 static inline bool
 353 is_ds_client(struct nfs_client *clp)
 354 {
 355         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 356 }
 357
 358 static inline bool
 359 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 360                     struct rpc_clnt **clntp, struct rpc_message *msg)
 361 {
 362         rpc_authflavor_t flavor;
 363
 364         if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 365             sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 366                 /* Using machine creds for cleanup operations
 367                  * is only relevent if the client credentials
 368                  * might expire. So don't bother for
 369                  * RPC_AUTH_UNIX.  If file was only exported to
 370                  * sec=sys, the PUTFH would fail anyway.
 371                  */
 372                 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 373                         return false;
 374         }
 375         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 376                 msg->rpc_cred = rpc_machine_cred();
 377
 378                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 379                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 380                              flavor != RPC_AUTH_GSS_KRB5P);
 381                 *clntp = clp->cl_rpcclient;
 382
 383                 return true;
 384         }
 385         return false;
 386 }
 387
 388 /*
 389  * Function responsible for determining if an rpc_message should use the
 390  * machine cred under SP4_MACH_CRED and if so switching the credential and
 391  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 392  * Should be called before rpc_call_sync/rpc_call_async.
 393  */
 394 static inline void
 395 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 396                    struct rpc_clnt **clntp, struct rpc_message *msg)
 397 {
 398         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 399 }
 400
 401 /*
 402  * Special wrapper to nfs4_state_protect for write.
 403  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 404  * that use machine cred use NFS_FILE_SYNC.
 405  */
 406 static inline void
 407 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 408                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 409 {
 410         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 411             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 412                 hdr->args.stable = NFS_FILE_SYNC;
 413 }
 414 #else /* CONFIG_NFS_v4_1 */
 415 static inline bool
 416 is_ds_only_client(struct nfs_client *clp)
 417 {
 418         return false;
 419 }
 420
 421 static inline bool
 422 is_ds_client(struct nfs_client *clp)
 423 {
 424         return false;
 425 }
 426
 427 static inline void
 428 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 429                    struct rpc_clnt **clntp, struct rpc_message *msg)
 430 {
 431 }
 432
 433 static inline void
 434 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 435                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 436 {
 437 }
 438 #endif /* CONFIG_NFS_V4_1 */
 439
 440 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 441
 442 extern const u32 nfs4_fattr_bitmap[3];
 443 extern const u32 nfs4_statfs_bitmap[3];
 444 extern const u32 nfs4_pathconf_bitmap[3];
 445 extern const u32 nfs4_fsinfo_bitmap[3];
 446 extern const u32 nfs4_fs_locations_bitmap[3];
 447
 448 void nfs40_shutdown_client(struct nfs_client *);
 449 void nfs41_shutdown_client(struct nfs_client *);
 450 int nfs40_init_client(struct nfs_client *);
 451 int nfs41_init_client(struct nfs_client *);
 452 void nfs4_free_client(struct nfs_client *);
 453
 454 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 455
 456 /* nfs4renewd.c */
 457 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 458 extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 459 extern void nfs4_kill_renewd(struct nfs_client *);
 460 extern void nfs4_renew_state(struct work_struct *);
 461 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 462
 463
 464 /* nfs4state.c */
 465 extern const nfs4_stateid current_stateid;
 466
 467 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 468 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 469 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 470 int nfs4_discover_server_trunking(struct nfs_client *clp,
 471                         struct nfs_client **);
 472 int nfs40_discover_server_trunking(struct nfs_client *clp,
 473                         struct nfs_client **, const struct cred *);
 474 #if defined(CONFIG_NFS_V4_1)
 475 int nfs41_discover_server_trunking(struct nfs_client *clp,
 476                         struct nfs_client **, const struct cred *);
 477 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 478 extern void nfs41_notify_server(struct nfs_client *);
 479 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 480                         struct nfs41_server_owner *o2);
 481 #else
 482 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 483 {
 484 }
 485 #endif /* CONFIG_NFS_V4_1 */
 486
 487 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 488 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 489 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 490 extern void nfs4_free_state_owners(struct list_head *head);
 491 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 492 extern void nfs4_put_open_state(struct nfs4_state *);
 493 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 494 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 495 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 496 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 497                 const nfs4_stateid *stateid);
 498 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 499 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 500 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 501 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 502 extern void nfs4_schedule_state_manager(struct nfs_client *);
 503 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 504 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 505 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 506 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 507 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 508 extern void nfs41_handle_server_scope(struct nfs_client *,
 509                                       struct nfs41_server_scope **);
 510 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 511 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 512 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 513                 const struct nfs_lock_context *, nfs4_stateid *,
 514                 const struct cred **);
 515 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 516                 struct nfs4_state *state);
 517
 518 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 519 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 520 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 521 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 522 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 523 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 524 extern int nfs4_setup_sequence(struct nfs_client *client,
 525                                 struct nfs4_sequence_args *args,
 526                                 struct nfs4_sequence_res *res,
 527                                 struct rpc_task *task);
 528 extern int nfs4_sequence_done(struct rpc_task *task,
 529                               struct nfs4_sequence_res *res);
 530
 531 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 532 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 533 extern const nfs4_stateid zero_stateid;
 534 extern const nfs4_stateid invalid_stateid;
 535
 536 /* nfs4super.c */
 537 struct nfs_mount_info;
 538 extern struct nfs_subversion nfs_v4;
 539 extern bool nfs4_disable_idmapping;
 540 extern unsigned short max_session_slots;
 541 extern unsigned short max_session_cb_slots;
 542 extern unsigned short send_implementation_id;
 543 extern bool recover_lost_locks;
 544
 545 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 546 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 547
 548 extern int nfs4_try_get_tree(struct fs_context *);
 549 extern int nfs4_get_referral_tree(struct fs_context *);
 550
 551 /* nfs4sysctl.c */
 552 #ifdef CONFIG_SYSCTL
 553 int nfs4_register_sysctl(void);
 554 void nfs4_unregister_sysctl(void);
 555 #else
 556 static inline int nfs4_register_sysctl(void)
 557 {
 558         return 0;
 559 }
 560
 561 static inline void nfs4_unregister_sysctl(void)
 562 {
 563 }
 564 #endif
 565
 566 /* nfs4xdr.c */
 567 extern const struct rpc_procinfo nfs4_procedures[];
 568
 569 #ifdef CONFIG_NFS_V4_2
 570 extern const u32 nfs42_maxsetxattr_overhead;
 571 extern const u32 nfs42_maxgetxattr_overhead;
 572 extern const u32 nfs42_maxlistxattrs_overhead;
 573 #endif
 574
 575 struct nfs4_mount_data;
 576
 577 /* callback_xdr.c */
 578 extern const struct svc_version nfs4_callback_version1;
 579 extern const struct svc_version nfs4_callback_version4;
 580
 581 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 582 {
 583         memcpy(dst->data, src->data, sizeof(dst->data));
 584         dst->type = src->type;
 585 }
 586
 587 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 588 {
 589         if (dst->type != src->type)
 590                 return false;
 591         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 592 }
 593
 594 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 595 {
 596         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 597 }
 598
 599 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 600 {
 601         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 602 }
 603
 604 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
 605 {
 606         u32 seq1 = be32_to_cpu(s1->seqid);
 607         u32 seq2 = be32_to_cpu(s2->seqid);
 608
 609         return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
 610 }
 611
 612 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
 613 {
 614         return nfs4_stateid_match_other(dst, src) &&
 615                 !(src->seqid && nfs4_stateid_is_newer(dst, src));
 616 }
 617
 618 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
 619 {
 620         u32 seqid = be32_to_cpu(s1->seqid);
 621
 622         if (++seqid == 0)
 623                 ++seqid;
 624         s1->seqid = cpu_to_be32(seqid);
 625 }
 626
 627 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 628 {
 629         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 630 }
 631
 632 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 633                 const nfs4_stateid *stateid)
 634 {
 635         return test_bit(NFS_OPEN_STATE, &state->flags) &&
 636                 nfs4_stateid_match_other(&state->open_stateid, stateid);
 637 }
 638
 639 /* nfs42xattr.c */
 640 #ifdef CONFIG_NFS_V4_2
 641 extern int __init nfs4_xattr_cache_init(void);
 642 extern void nfs4_xattr_cache_exit(void);
 643 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
 644                                  const char *buf, struct page **pages,
 645                                  ssize_t buflen);
 646 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
 647 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
 648                                 char *buf, ssize_t buflen);
 649 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
 650                                       ssize_t buflen);
 651 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
 652                                      ssize_t buflen);
 653 extern void nfs4_xattr_cache_zap(struct inode *inode);
 654 #else
 655 static inline void nfs4_xattr_cache_zap(struct inode *inode)
 656 {
 657 }
 658 #endif /* CONFIG_NFS_V4_2 */
 659
 660 #else /* CONFIG_NFS_V4 */
 661
 662 #define nfs4_close_state(a, b) do { } while (0)
 663 #define nfs4_close_sync(a, b) do { } while (0)
 664 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 665 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 666
 667
 668 #endif /* CONFIG_NFS_V4 */
 669 #endif /* __LINUX_FS_NFS_NFS4_FS.H */