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 #include <linux/filelock.h>
  27
  28 struct idmap;
  29
  30 enum nfs4_client_state {
  31         NFS4CLNT_MANAGER_RUNNING  = 0,
  32         NFS4CLNT_CHECK_LEASE,
  33         NFS4CLNT_LEASE_EXPIRED,
  34         NFS4CLNT_RECLAIM_REBOOT,
  35         NFS4CLNT_RECLAIM_NOGRACE,
  36         NFS4CLNT_DELEGRETURN,
  37         NFS4CLNT_SESSION_RESET,
  38         NFS4CLNT_LEASE_CONFIRM,
  39         NFS4CLNT_SERVER_SCOPE_MISMATCH,
  40         NFS4CLNT_PURGE_STATE,
  41         NFS4CLNT_BIND_CONN_TO_SESSION,
  42         NFS4CLNT_MOVED,
  43         NFS4CLNT_LEASE_MOVED,
  44         NFS4CLNT_DELEGATION_EXPIRED,
  45         NFS4CLNT_RUN_MANAGER,
  46         NFS4CLNT_MANAGER_AVAILABLE,
  47         NFS4CLNT_RECALL_RUNNING,
  48         NFS4CLNT_RECALL_ANY_LAYOUT_READ,
  49         NFS4CLNT_RECALL_ANY_LAYOUT_RW,
  50         NFS4CLNT_DELEGRETURN_DELAYED,
  51 };
  52
  53 #define NFS4_RENEW_TIMEOUT              0x01
  54 #define NFS4_RENEW_DELEGATION_CB        0x02
  55
  56 struct nfs_seqid_counter;
  57 struct nfs4_minor_version_ops {
  58         u32     minor_version;
  59         unsigned init_caps;
  60
  61         int     (*init_client)(struct nfs_client *);
  62         void    (*shutdown_client)(struct nfs_client *);
  63         bool    (*match_stateid)(const nfs4_stateid *,
  64                         const nfs4_stateid *);
  65         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
  66                         struct nfs_fsinfo *);
  67         void    (*free_lock_state)(struct nfs_server *,
  68                         struct nfs4_lock_state *);
  69         int     (*test_and_free_expired)(struct nfs_server *,
  70                                          const nfs4_stateid *,
  71                                          const struct cred *);
  72         struct nfs_seqid *
  73                 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
  74         void    (*session_trunk)(struct rpc_clnt *clnt,
  75                         struct rpc_xprt *xprt, void *data);
  76         const struct rpc_call_ops *call_sync_ops;
  77         const struct nfs4_state_recovery_ops *reboot_recovery_ops;
  78         const struct nfs4_state_recovery_ops *nograce_recovery_ops;
  79         const struct nfs4_state_maintenance_ops *state_renewal_ops;
  80         const struct nfs4_mig_recovery_ops *mig_recovery_ops;
  81 };
  82
  83 #define NFS_SEQID_CONFIRMED 1
  84 struct nfs_seqid_counter {
  85         ktime_t create_time;
  86         u64 owner_id;
  87         int flags;
  88         u32 counter;
  89         spinlock_t lock;                /* Protects the list */
  90         struct list_head list;          /* Defines sequence of RPC calls */
  91         struct rpc_wait_queue   wait;   /* RPC call delay queue */
  92 };
  93
  94 struct nfs_seqid {
  95         struct nfs_seqid_counter *sequence;
  96         struct list_head list;
  97         struct rpc_task *task;
  98 };
  99
 100 static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)
 101 {
 102         if (seqid_mutating_err(-status))
 103                 seqid->flags |= NFS_SEQID_CONFIRMED;
 104 }
 105
 106 /*
 107  * NFS4 state_owners and lock_owners are simply labels for ordered
 108  * sequences of RPC calls. Their sole purpose is to provide once-only
 109  * semantics by allowing the server to identify replayed requests.
 110  */
 111 struct nfs4_state_owner {
 112         struct nfs_server    *so_server;
 113         struct list_head     so_lru;
 114         unsigned long        so_expires;
 115         struct rb_node       so_server_node;
 116
 117         const struct cred    *so_cred;   /* Associated cred */
 118
 119         spinlock_t           so_lock;
 120         atomic_t             so_count;
 121         unsigned long        so_flags;
 122         struct list_head     so_states;
 123         struct nfs_seqid_counter so_seqid;
 124         struct mutex         so_delegreturn_mutex;
 125 };
 126
 127 enum {
 128         NFS_OWNER_RECLAIM_REBOOT,
 129         NFS_OWNER_RECLAIM_NOGRACE
 130 };
 131
 132 #define NFS_LOCK_NEW            0
 133 #define NFS_LOCK_RECLAIM        1
 134 #define NFS_LOCK_EXPIRED        2
 135
 136 /*
 137  * struct nfs4_state maintains the client-side state for a given
 138  * (state_owner,inode) tuple (OPEN) or state_owner (LOCK).
 139  *
 140  * OPEN:
 141  * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server,
 142  * we need to know how many files are open for reading or writing on a
 143  * given inode. This information too is stored here.
 144  *
 145  * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN)
 146  */
 147
 148 struct nfs4_lock_state {
 149         struct list_head        ls_locks;       /* Other lock stateids */
 150         struct nfs4_state *     ls_state;       /* Pointer to open state */
 151 #define NFS_LOCK_INITIALIZED 0
 152 #define NFS_LOCK_LOST        1
 153 #define NFS_LOCK_UNLOCKING   2
 154         unsigned long           ls_flags;
 155         struct nfs_seqid_counter        ls_seqid;
 156         nfs4_stateid            ls_stateid;
 157         refcount_t              ls_count;
 158         fl_owner_t              ls_owner;
 159 };
 160
 161 /* bits for nfs4_state->flags */
 162 enum {
 163         LK_STATE_IN_USE,
 164         NFS_DELEGATED_STATE,            /* Current stateid is delegation */
 165         NFS_OPEN_STATE,                 /* OPEN stateid is set */
 166         NFS_O_RDONLY_STATE,             /* OPEN stateid has read-only state */
 167         NFS_O_WRONLY_STATE,             /* OPEN stateid has write-only state */
 168         NFS_O_RDWR_STATE,               /* OPEN stateid has read/write state */
 169         NFS_STATE_RECLAIM_REBOOT,       /* OPEN stateid server rebooted */
 170         NFS_STATE_RECLAIM_NOGRACE,      /* OPEN stateid needs to recover state */
 171         NFS_STATE_POSIX_LOCKS,          /* Posix locks are supported */
 172         NFS_STATE_RECOVERY_FAILED,      /* OPEN stateid state recovery failed */
 173         NFS_STATE_MAY_NOTIFY_LOCK,      /* server may CB_NOTIFY_LOCK */
 174         NFS_STATE_CHANGE_WAIT,          /* A state changing operation is outstanding */
 175         NFS_CLNT_DST_SSC_COPY_STATE,    /* dst server open state on client*/
 176         NFS_CLNT_SRC_SSC_COPY_STATE,    /* src server open state on client*/
 177         NFS_SRV_SSC_COPY_STATE,         /* ssc state on the dst server */
 178 };
 179
 180 struct nfs4_state {
 181         struct list_head open_states;   /* List of states for the same state_owner */
 182         struct list_head inode_states;  /* List of states for the same inode */
 183         struct list_head lock_states;   /* List of subservient lock stateids */
 184
 185         struct nfs4_state_owner *owner; /* Pointer to the open owner */
 186         struct inode *inode;            /* Pointer to the inode */
 187
 188         unsigned long flags;            /* Do we hold any locks? */
 189         spinlock_t state_lock;          /* Protects the lock_states list */
 190
 191         seqlock_t seqlock;              /* Protects the stateid/open_stateid */
 192         nfs4_stateid stateid;           /* Current stateid: may be delegation */
 193         nfs4_stateid open_stateid;      /* OPEN stateid */
 194
 195         /* The following 3 fields are protected by owner->so_lock */
 196         unsigned int n_rdonly;          /* Number of read-only references */
 197         unsigned int n_wronly;          /* Number of write-only references */
 198         unsigned int n_rdwr;            /* Number of read/write references */
 199         fmode_t state;                  /* State on the server (R,W, or RW) */
 200         refcount_t count;
 201
 202         wait_queue_head_t waitq;
 203         struct rcu_head rcu_head;
 204 };
 205
 206
 207 struct nfs4_exception {
 208         struct nfs4_state *state;
 209         struct inode *inode;
 210         nfs4_stateid *stateid;
 211         long timeout;
 212         unsigned short retrans;
 213         unsigned char task_is_privileged : 1;
 214         unsigned char delay : 1,
 215                       recovering : 1,
 216                       retry : 1;
 217         bool interruptible;
 218 };
 219
 220 struct nfs4_state_recovery_ops {
 221         int owner_flag_bit;
 222         int state_flag_bit;
 223         int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *);
 224         int (*recover_lock)(struct nfs4_state *, struct file_lock *);
 225         int (*establish_clid)(struct nfs_client *, const struct cred *);
 226         int (*reclaim_complete)(struct nfs_client *, const struct cred *);
 227         int (*detect_trunking)(struct nfs_client *, struct nfs_client **,
 228                 const struct cred *);
 229 };
 230
 231 struct nfs4_opendata {
 232         struct kref kref;
 233         struct nfs_openargs o_arg;
 234         struct nfs_openres o_res;
 235         struct nfs_open_confirmargs c_arg;
 236         struct nfs_open_confirmres c_res;
 237         struct nfs4_string owner_name;
 238         struct nfs4_string group_name;
 239         struct nfs4_label *a_label;
 240         struct nfs_fattr f_attr;
 241         struct dentry *dir;
 242         struct dentry *dentry;
 243         struct nfs4_state_owner *owner;
 244         struct nfs4_state *state;
 245         struct iattr attrs;
 246         struct nfs4_layoutget *lgp;
 247         unsigned long timestamp;
 248         bool rpc_done;
 249         bool file_created;
 250         bool is_recover;
 251         bool cancelled;
 252         int rpc_status;
 253 };
 254
 255 struct nfs4_add_xprt_data {
 256         struct nfs_client       *clp;
 257         const struct cred       *cred;
 258 };
 259
 260 struct nfs4_state_maintenance_ops {
 261         int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned);
 262         const struct cred * (*get_state_renewal_cred)(struct nfs_client *);
 263         int (*renew_lease)(struct nfs_client *, const struct cred *);
 264 };
 265
 266 struct nfs4_mig_recovery_ops {
 267         int (*get_locations)(struct nfs_server *, struct nfs_fh *,
 268                 struct nfs4_fs_locations *, struct page *, const struct cred *);
 269         int (*fsid_present)(struct inode *, const struct cred *);
 270 };
 271
 272 extern const struct dentry_operations nfs4_dentry_operations;
 273
 274 /* dir.c */
 275 int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 276                     unsigned, umode_t);
 277
 278 /* fs_context.c */
 279 extern struct file_system_type nfs4_fs_type;
 280
 281 /* nfs4namespace.c */
 282 struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 283                                          const struct qstr *);
 284 int nfs4_submount(struct fs_context *, struct nfs_server *);
 285 int nfs4_replace_transport(struct nfs_server *server,
 286                                 const struct nfs4_fs_locations *locations);
 287 size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss,
 288                              size_t salen, struct net *net, int port);
 289 /* nfs4proc.c */
 290 extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 291 extern int nfs4_async_handle_error(struct rpc_task *task,
 292                                    struct nfs_server *server,
 293                                    struct nfs4_state *state, long *timeout);
 294 extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 295                           struct rpc_message *, struct nfs4_sequence_args *,
 296                           struct nfs4_sequence_res *, int);
 297 extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 298 extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 299 extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 300 extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 301 extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 302 extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 303 extern int nfs4_destroy_clientid(struct nfs_client *clp);
 304 extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 305 extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 306 extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 307 extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 308 extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 309                                   struct nfs4_fs_locations *, struct page *);
 310 extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
 311                                    struct nfs4_fs_locations *,
 312                                    struct page *page, const struct cred *);
 313 extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 314 extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
 315                                                     struct dentry *,
 316                                                     struct nfs_fh *,
 317                                                     struct nfs_fattr *);
 318 extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 319 extern const struct xattr_handler * const nfs4_xattr_handlers[];
 320 extern int nfs4_set_rw_stateid(nfs4_stateid *stateid,
 321                 const struct nfs_open_context *ctx,
 322                 const struct nfs_lock_context *l_ctx,
 323                 fmode_t fmode);
 324 extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
 325                              struct inode *inode, unsigned long cache_validity);
 326 extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 327                              struct nfs_fattr *fattr, struct inode *inode);
 328 extern int update_open_stateid(struct nfs4_state *state,
 329                                 const nfs4_stateid *open_stateid,
 330                                 const nfs4_stateid *deleg_stateid,
 331                                 fmode_t fmode);
 332 extern int nfs4_proc_setlease(struct file *file, int arg,
 333                               struct file_lease **lease, void **priv);
 334 extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 335                 struct nfs_fsinfo *fsinfo);
 336 extern void nfs4_update_changeattr(struct inode *dir,
 337                                    struct nfs4_change_info *cinfo,
 338                                    unsigned long timestamp,
 339                                    unsigned long cache_validity);
 340 extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
 341                                     struct page **pages);
 342
 343 #if defined(CONFIG_NFS_V4_1)
 344 extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 345 extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 346 extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 347 extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 348                                   bool sync);
 349 extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 350                 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 351
 352 static inline bool
 353 is_ds_only_client(struct nfs_client *clp)
 354 {
 355         return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 356                 EXCHGID4_FLAG_USE_PNFS_DS;
 357 }
 358
 359 static inline bool
 360 is_ds_client(struct nfs_client *clp)
 361 {
 362         return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 363 }
 364
 365 static inline bool
 366 _nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 367                     struct rpc_clnt **clntp, struct rpc_message *msg)
 368 {
 369         rpc_authflavor_t flavor;
 370
 371         if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 372             sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 373                 /* Using machine creds for cleanup operations
 374                  * is only relevent if the client credentials
 375                  * might expire. So don't bother for
 376                  * RPC_AUTH_UNIX.  If file was only exported to
 377                  * sec=sys, the PUTFH would fail anyway.
 378                  */
 379                 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 380                         return false;
 381         }
 382         if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 383                 msg->rpc_cred = rpc_machine_cred();
 384
 385                 flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 386                 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 387                              flavor != RPC_AUTH_GSS_KRB5P);
 388                 *clntp = clp->cl_rpcclient;
 389
 390                 return true;
 391         }
 392         return false;
 393 }
 394
 395 /*
 396  * Function responsible for determining if an rpc_message should use the
 397  * machine cred under SP4_MACH_CRED and if so switching the credential and
 398  * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 399  * Should be called before rpc_call_sync/rpc_call_async.
 400  */
 401 static inline void
 402 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 403                    struct rpc_clnt **clntp, struct rpc_message *msg)
 404 {
 405         _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 406 }
 407
 408 /*
 409  * Special wrapper to nfs4_state_protect for write.
 410  * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 411  * that use machine cred use NFS_FILE_SYNC.
 412  */
 413 static inline void
 414 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 415                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 416 {
 417         if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 418             !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 419                 hdr->args.stable = NFS_FILE_SYNC;
 420 }
 421 #else /* CONFIG_NFS_v4_1 */
 422 static inline bool
 423 is_ds_only_client(struct nfs_client *clp)
 424 {
 425         return false;
 426 }
 427
 428 static inline bool
 429 is_ds_client(struct nfs_client *clp)
 430 {
 431         return false;
 432 }
 433
 434 static inline void
 435 nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 436                    struct rpc_clnt **clntp, struct rpc_message *msg)
 437 {
 438 }
 439
 440 static inline void
 441 nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 442                          struct rpc_message *msg, struct nfs_pgio_header *hdr)
 443 {
 444 }
 445 #endif /* CONFIG_NFS_V4_1 */
 446
 447 extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 448
 449 extern const u32 nfs4_fattr_bitmap[3];
 450 extern const u32 nfs4_statfs_bitmap[3];
 451 extern const u32 nfs4_pathconf_bitmap[3];
 452 extern const u32 nfs4_fsinfo_bitmap[3];
 453 extern const u32 nfs4_fs_locations_bitmap[3];
 454
 455 void nfs40_shutdown_client(struct nfs_client *);
 456 void nfs41_shutdown_client(struct nfs_client *);
 457 int nfs40_init_client(struct nfs_client *);
 458 int nfs41_init_client(struct nfs_client *);
 459 void nfs4_free_client(struct nfs_client *);
 460
 461 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 462
 463 /* nfs4renewd.c */
 464 extern void nfs4_schedule_state_renewal(struct nfs_client *);
 465 extern void nfs4_kill_renewd(struct nfs_client *);
 466 extern void nfs4_renew_state(struct work_struct *);
 467 extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 468
 469
 470 /* nfs4state.c */
 471 extern const nfs4_stateid current_stateid;
 472
 473 const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 474 const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 475 const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 476 int nfs4_discover_server_trunking(struct nfs_client *clp,
 477                         struct nfs_client **);
 478 int nfs40_discover_server_trunking(struct nfs_client *clp,
 479                         struct nfs_client **, const struct cred *);
 480 #if defined(CONFIG_NFS_V4_1)
 481 int nfs41_discover_server_trunking(struct nfs_client *clp,
 482                         struct nfs_client **, const struct cred *);
 483 extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 484 extern void nfs41_notify_server(struct nfs_client *);
 485 bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 486                         struct nfs41_server_owner *o2);
 487 #else
 488 static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 489 {
 490 }
 491 #endif /* CONFIG_NFS_V4_1 */
 492
 493 extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 494 extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 495 extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 496 extern void nfs4_free_state_owners(struct list_head *head);
 497 extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 498 extern void nfs4_put_open_state(struct nfs4_state *);
 499 extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 500 extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 501 extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 502 extern void nfs_inode_find_state_and_recover(struct inode *inode,
 503                 const nfs4_stateid *stateid);
 504 extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 505 extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 506 extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 507 extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 508 extern void nfs4_schedule_state_manager(struct nfs_client *);
 509 extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 510 extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 511 extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 512 extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 513 extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 514 extern void nfs41_handle_server_scope(struct nfs_client *,
 515                                       struct nfs41_server_scope **);
 516 extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 517 extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 518 extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 519                 const struct nfs_lock_context *, nfs4_stateid *,
 520                 const struct cred **);
 521 extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 522                 struct nfs4_state *state);
 523
 524 extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 525 extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 526 extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 527 extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 528 extern void nfs_release_seqid(struct nfs_seqid *seqid);
 529 extern void nfs_free_seqid(struct nfs_seqid *seqid);
 530 extern int nfs4_setup_sequence(struct nfs_client *client,
 531                                 struct nfs4_sequence_args *args,
 532                                 struct nfs4_sequence_res *res,
 533                                 struct rpc_task *task);
 534 extern int nfs4_sequence_done(struct rpc_task *task,
 535                               struct nfs4_sequence_res *res);
 536
 537 extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 538 extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 539 extern const nfs4_stateid zero_stateid;
 540 extern const nfs4_stateid invalid_stateid;
 541
 542 /* nfs4super.c */
 543 struct nfs_mount_info;
 544 extern struct nfs_subversion nfs_v4;
 545 extern bool nfs4_disable_idmapping;
 546 extern unsigned short max_session_slots;
 547 extern unsigned short max_session_cb_slots;
 548 extern unsigned short send_implementation_id;
 549 extern bool recover_lost_locks;
 550 extern short nfs_delay_retrans;
 551
 552 #define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 553 extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 554
 555 extern int nfs4_try_get_tree(struct fs_context *);
 556 extern int nfs4_get_referral_tree(struct fs_context *);
 557
 558 /* nfs4sysctl.c */
 559 #ifdef CONFIG_SYSCTL
 560 int nfs4_register_sysctl(void);
 561 void nfs4_unregister_sysctl(void);
 562 #else
 563 static inline int nfs4_register_sysctl(void)
 564 {
 565         return 0;
 566 }
 567
 568 static inline void nfs4_unregister_sysctl(void)
 569 {
 570 }
 571 #endif
 572
 573 /* nfs4xdr.c */
 574 extern const struct rpc_procinfo nfs4_procedures[];
 575
 576 #ifdef CONFIG_NFS_V4_2
 577 extern const u32 nfs42_maxsetxattr_overhead;
 578 extern const u32 nfs42_maxgetxattr_overhead;
 579 extern const u32 nfs42_maxlistxattrs_overhead;
 580 #endif
 581
 582 struct nfs4_mount_data;
 583
 584 /* callback_xdr.c */
 585 extern const struct svc_version nfs4_callback_version1;
 586 extern const struct svc_version nfs4_callback_version4;
 587
 588 static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 589 {
 590         memcpy(dst->data, src->data, sizeof(dst->data));
 591         dst->type = src->type;
 592 }
 593
 594 static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 595 {
 596         if (dst->type != src->type)
 597                 return false;
 598         return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 599 }
 600
 601 static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 602 {
 603         return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 604 }
 605
 606 static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 607 {
 608         return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 609 }
 610
 611 static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
 612 {
 613         u32 seq1 = be32_to_cpu(s1->seqid);
 614         u32 seq2 = be32_to_cpu(s2->seqid);
 615
 616         return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
 617 }
 618
 619 static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
 620 {
 621         return nfs4_stateid_match_other(dst, src) &&
 622                 !(src->seqid && nfs4_stateid_is_newer(dst, src));
 623 }
 624
 625 static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
 626 {
 627         u32 seqid = be32_to_cpu(s1->seqid);
 628
 629         if (++seqid == 0)
 630                 ++seqid;
 631         s1->seqid = cpu_to_be32(seqid);
 632 }
 633
 634 static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 635 {
 636         return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 637 }
 638
 639 static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 640                 const nfs4_stateid *stateid)
 641 {
 642         return test_bit(NFS_OPEN_STATE, &state->flags) &&
 643                 nfs4_stateid_match_other(&state->open_stateid, stateid);
 644 }
 645
 646 /* nfs42xattr.c */
 647 #ifdef CONFIG_NFS_V4_2
 648 extern int __init nfs4_xattr_cache_init(void);
 649 extern void nfs4_xattr_cache_exit(void);
 650 extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
 651                                  const char *buf, struct page **pages,
 652                                  ssize_t buflen);
 653 extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
 654 extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
 655                                 char *buf, ssize_t buflen);
 656 extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
 657                                       ssize_t buflen);
 658 extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
 659                                      ssize_t buflen);
 660 extern void nfs4_xattr_cache_zap(struct inode *inode);
 661 #else
 662 static inline void nfs4_xattr_cache_zap(struct inode *inode)
 663 {
 664 }
 665 #endif /* CONFIG_NFS_V4_2 */
 666
 667 #else /* CONFIG_NFS_V4 */
 668
 669 #define nfs4_close_state(a, b) do { } while (0)
 670 #define nfs4_close_sync(a, b) do { } while (0)
 671 #define nfs4_state_protect(a, b, c, d) do { } while (0)
 672 #define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 673
 674
 675 #endif /* CONFIG_NFS_V4 */
 676 #endif /* __LINUX_FS_NFS_NFS4_FS.H */