linux/fs/nfs/nfs4_fs.h
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   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
  27struct idmap;
  28
  29enum 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
  53struct nfs_seqid_counter;
  54struct 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
  80struct 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
  90struct nfs_seqid {
  91        struct nfs_seqid_counter *sequence;
  92        struct list_head list;
  93        struct rpc_task *task;
  94};
  95
  96static 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 */
 107struct 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_t           so_reclaim_seqcount;
 121        struct mutex         so_delegreturn_mutex;
 122};
 123
 124enum {
 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
 145struct 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 */
 158enum {
 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
 176struct 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
 203struct 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
 214struct 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
 225struct 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
 250struct nfs4_add_xprt_data {
 251        struct nfs_client       *clp;
 252        const struct cred       *cred;
 253};
 254
 255struct 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
 261struct 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
 267extern const struct dentry_operations nfs4_dentry_operations;
 268
 269/* dir.c */
 270int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 271                    unsigned, umode_t);
 272
 273/* fs_context.c */
 274extern struct file_system_type nfs4_fs_type;
 275
 276/* nfs4namespace.c */
 277struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 278                                         const struct qstr *);
 279int nfs4_submount(struct fs_context *, struct nfs_server *);
 280int nfs4_replace_transport(struct nfs_server *server,
 281                                const struct nfs4_fs_locations *locations);
 282
 283/* nfs4proc.c */
 284extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 285extern int nfs4_async_handle_error(struct rpc_task *task,
 286                                   struct nfs_server *server,
 287                                   struct nfs4_state *state, long *timeout);
 288extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 289                          struct rpc_message *, struct nfs4_sequence_args *,
 290                          struct nfs4_sequence_res *, int);
 291extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 292extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 293extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 294extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 295extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 296extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 297extern int nfs4_destroy_clientid(struct nfs_client *clp);
 298extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 299extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 300extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 301extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 302extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 303                                  struct nfs4_fs_locations *, struct page *);
 304extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 305                struct page *page, const struct cred *);
 306extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 307extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
 308                                                    struct dentry *,
 309                                                    struct nfs_fh *,
 310                                                    struct nfs_fattr *);
 311extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 312extern const struct xattr_handler *nfs4_xattr_handlers[];
 313extern 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);
 317extern 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);
 320extern 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
 325extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 326                struct nfs_fsinfo *fsinfo);
 327#if defined(CONFIG_NFS_V4_1)
 328extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 329extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 330extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 331extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 332                                  bool sync);
 333extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 334                struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 335
 336static inline bool
 337is_ds_only_client(struct nfs_client *clp)
 338{
 339        return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 340                EXCHGID4_FLAG_USE_PNFS_DS;
 341}
 342
 343static inline bool
 344is_ds_client(struct nfs_client *clp)
 345{
 346        return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 347}
 348
 349static inline bool
 350_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 351                    struct rpc_clnt **clntp, struct rpc_message *msg)
 352{
 353        rpc_authflavor_t flavor;
 354
 355        if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 356            sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 357                /* Using machine creds for cleanup operations
 358                 * is only relevent if the client credentials
 359                 * might expire. So don't bother for
 360                 * RPC_AUTH_UNIX.  If file was only exported to
 361                 * sec=sys, the PUTFH would fail anyway.
 362                 */
 363                if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 364                        return false;
 365        }
 366        if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 367                msg->rpc_cred = rpc_machine_cred();
 368
 369                flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 370                WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 371                             flavor != RPC_AUTH_GSS_KRB5P);
 372                *clntp = clp->cl_rpcclient;
 373
 374                return true;
 375        }
 376        return false;
 377}
 378
 379/*
 380 * Function responsible for determining if an rpc_message should use the
 381 * machine cred under SP4_MACH_CRED and if so switching the credential and
 382 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 383 * Should be called before rpc_call_sync/rpc_call_async.
 384 */
 385static inline void
 386nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 387                   struct rpc_clnt **clntp, struct rpc_message *msg)
 388{
 389        _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 390}
 391
 392/*
 393 * Special wrapper to nfs4_state_protect for write.
 394 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 395 * that use machine cred use NFS_FILE_SYNC.
 396 */
 397static inline void
 398nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 399                         struct rpc_message *msg, struct nfs_pgio_header *hdr)
 400{
 401        if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 402            !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 403                hdr->args.stable = NFS_FILE_SYNC;
 404}
 405#else /* CONFIG_NFS_v4_1 */
 406static inline bool
 407is_ds_only_client(struct nfs_client *clp)
 408{
 409        return false;
 410}
 411
 412static inline bool
 413is_ds_client(struct nfs_client *clp)
 414{
 415        return false;
 416}
 417
 418static inline void
 419nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 420                   struct rpc_clnt **clntp, struct rpc_message *msg)
 421{
 422}
 423
 424static inline void
 425nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 426                         struct rpc_message *msg, struct nfs_pgio_header *hdr)
 427{
 428}
 429#endif /* CONFIG_NFS_V4_1 */
 430
 431extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 432
 433extern const u32 nfs4_fattr_bitmap[3];
 434extern const u32 nfs4_statfs_bitmap[3];
 435extern const u32 nfs4_pathconf_bitmap[3];
 436extern const u32 nfs4_fsinfo_bitmap[3];
 437extern const u32 nfs4_fs_locations_bitmap[3];
 438
 439void nfs40_shutdown_client(struct nfs_client *);
 440void nfs41_shutdown_client(struct nfs_client *);
 441int nfs40_init_client(struct nfs_client *);
 442int nfs41_init_client(struct nfs_client *);
 443void nfs4_free_client(struct nfs_client *);
 444
 445struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 446
 447/* nfs4renewd.c */
 448extern void nfs4_schedule_state_renewal(struct nfs_client *);
 449extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 450extern void nfs4_kill_renewd(struct nfs_client *);
 451extern void nfs4_renew_state(struct work_struct *);
 452extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 453
 454
 455/* nfs4state.c */
 456extern const nfs4_stateid current_stateid;
 457
 458const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 459const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 460const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 461int nfs4_discover_server_trunking(struct nfs_client *clp,
 462                        struct nfs_client **);
 463int nfs40_discover_server_trunking(struct nfs_client *clp,
 464                        struct nfs_client **, const struct cred *);
 465#if defined(CONFIG_NFS_V4_1)
 466int nfs41_discover_server_trunking(struct nfs_client *clp,
 467                        struct nfs_client **, const struct cred *);
 468extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 469extern void nfs41_notify_server(struct nfs_client *);
 470bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 471                        struct nfs41_server_owner *o2);
 472#else
 473static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 474{
 475}
 476#endif /* CONFIG_NFS_V4_1 */
 477
 478extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 479extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 480extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 481extern void nfs4_free_state_owners(struct list_head *head);
 482extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 483extern void nfs4_put_open_state(struct nfs4_state *);
 484extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 485extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 486extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 487extern void nfs_inode_find_state_and_recover(struct inode *inode,
 488                const nfs4_stateid *stateid);
 489extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 490extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 491extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 492extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 493extern void nfs4_schedule_state_manager(struct nfs_client *);
 494extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 495extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 496extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 497extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 498extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 499extern void nfs41_handle_server_scope(struct nfs_client *,
 500                                      struct nfs41_server_scope **);
 501extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 502extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 503extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 504                const struct nfs_lock_context *, nfs4_stateid *,
 505                const struct cred **);
 506extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 507                struct nfs4_state *state);
 508
 509extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 510extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 511extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 512extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 513extern void nfs_release_seqid(struct nfs_seqid *seqid);
 514extern void nfs_free_seqid(struct nfs_seqid *seqid);
 515extern int nfs4_setup_sequence(struct nfs_client *client,
 516                                struct nfs4_sequence_args *args,
 517                                struct nfs4_sequence_res *res,
 518                                struct rpc_task *task);
 519extern int nfs4_sequence_done(struct rpc_task *task,
 520                              struct nfs4_sequence_res *res);
 521
 522extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 523extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 524extern const nfs4_stateid zero_stateid;
 525extern const nfs4_stateid invalid_stateid;
 526
 527/* nfs4super.c */
 528struct nfs_mount_info;
 529extern struct nfs_subversion nfs_v4;
 530extern bool nfs4_disable_idmapping;
 531extern unsigned short max_session_slots;
 532extern unsigned short max_session_cb_slots;
 533extern unsigned short send_implementation_id;
 534extern bool recover_lost_locks;
 535
 536#define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 537extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 538
 539extern int nfs4_try_get_tree(struct fs_context *);
 540extern int nfs4_get_referral_tree(struct fs_context *);
 541
 542/* nfs4sysctl.c */
 543#ifdef CONFIG_SYSCTL
 544int nfs4_register_sysctl(void);
 545void nfs4_unregister_sysctl(void);
 546#else
 547static inline int nfs4_register_sysctl(void)
 548{
 549        return 0;
 550}
 551
 552static inline void nfs4_unregister_sysctl(void)
 553{
 554}
 555#endif
 556
 557/* nfs4xdr.c */
 558extern const struct rpc_procinfo nfs4_procedures[];
 559
 560struct nfs4_mount_data;
 561
 562/* callback_xdr.c */
 563extern const struct svc_version nfs4_callback_version1;
 564extern const struct svc_version nfs4_callback_version4;
 565
 566static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 567{
 568        memcpy(dst->data, src->data, sizeof(dst->data));
 569        dst->type = src->type;
 570}
 571
 572static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 573{
 574        if (dst->type != src->type)
 575                return false;
 576        return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 577}
 578
 579static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 580{
 581        return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 582}
 583
 584static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 585{
 586        return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 587}
 588
 589static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
 590{
 591        return nfs4_stateid_match_other(dst, src) &&
 592                !(src->seqid && nfs4_stateid_is_newer(dst, src));
 593}
 594
 595static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
 596{
 597        u32 seqid = be32_to_cpu(s1->seqid);
 598
 599        if (++seqid == 0)
 600                ++seqid;
 601        s1->seqid = cpu_to_be32(seqid);
 602}
 603
 604static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 605{
 606        return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 607}
 608
 609static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 610                const nfs4_stateid *stateid)
 611{
 612        return test_bit(NFS_OPEN_STATE, &state->flags) &&
 613                nfs4_stateid_match_other(&state->open_stateid, stateid);
 614}
 615
 616#else
 617
 618#define nfs4_close_state(a, b) do { } while (0)
 619#define nfs4_close_sync(a, b) do { } while (0)
 620#define nfs4_state_protect(a, b, c, d) do { } while (0)
 621#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 622
 623#endif /* CONFIG_NFS_V4 */
 624#endif /* __LINUX_FS_NFS_NFS4_FS.H */
 625
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