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        NFS4CLNT_DELEGRETURN_DELAYED,
  49};
  50
  51#define NFS4_RENEW_TIMEOUT              0x01
  52#define NFS4_RENEW_DELEGATION_CB        0x02
  53
  54struct nfs_seqid_counter;
  55struct 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
  81struct 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
  91struct nfs_seqid {
  92        struct nfs_seqid_counter *sequence;
  93        struct list_head list;
  94        struct rpc_task *task;
  95};
  96
  97static 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 */
 108struct 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
 125enum {
 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
 146struct 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 */
 159enum {
 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
 177struct 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
 204struct 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
 216struct 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
 227struct 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
 252struct nfs4_add_xprt_data {
 253        struct nfs_client       *clp;
 254        const struct cred       *cred;
 255};
 256
 257struct 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
 263struct 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
 269extern const struct dentry_operations nfs4_dentry_operations;
 270
 271/* dir.c */
 272int nfs_atomic_open(struct inode *, struct dentry *, struct file *,
 273                    unsigned, umode_t);
 274
 275/* fs_context.c */
 276extern struct file_system_type nfs4_fs_type;
 277
 278/* nfs4namespace.c */
 279struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *,
 280                                         const struct qstr *);
 281int nfs4_submount(struct fs_context *, struct nfs_server *);
 282int nfs4_replace_transport(struct nfs_server *server,
 283                                const struct nfs4_fs_locations *locations);
 284
 285/* nfs4proc.c */
 286extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *);
 287extern int nfs4_async_handle_error(struct rpc_task *task,
 288                                   struct nfs_server *server,
 289                                   struct nfs4_state *state, long *timeout);
 290extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *,
 291                          struct rpc_message *, struct nfs4_sequence_args *,
 292                          struct nfs4_sequence_res *, int);
 293extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int);
 294extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *);
 295extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *);
 296extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool);
 297extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred);
 298extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred);
 299extern int nfs4_destroy_clientid(struct nfs_client *clp);
 300extern int nfs4_init_clientid(struct nfs_client *, const struct cred *);
 301extern int nfs41_init_clientid(struct nfs_client *, const struct cred *);
 302extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
 303extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
 304extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
 305                                  struct nfs4_fs_locations *, struct page *);
 306extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
 307                struct page *page, const struct cred *);
 308extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
 309extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
 310                                                    struct dentry *,
 311                                                    struct nfs_fh *,
 312                                                    struct nfs_fattr *);
 313extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 314extern const struct xattr_handler *nfs4_xattr_handlers[];
 315extern 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);
 319extern 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);
 322extern int update_open_stateid(struct nfs4_state *state,
 323                                const nfs4_stateid *open_stateid,
 324                                const nfs4_stateid *deleg_stateid,
 325                                fmode_t fmode);
 326extern int nfs4_proc_setlease(struct file *file, long arg,
 327                              struct file_lock **lease, void **priv);
 328extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
 329                struct nfs_fsinfo *fsinfo);
 330extern void nfs4_update_changeattr(struct inode *dir,
 331                                   struct nfs4_change_info *cinfo,
 332                                   unsigned long timestamp,
 333                                   unsigned long cache_validity);
 334extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
 335                                    struct page **pages);
 336
 337#if defined(CONFIG_NFS_V4_1)
 338extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *);
 339extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *);
 340extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *);
 341extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 342                                  bool sync);
 343extern int nfs4_detect_session_trunking(struct nfs_client *clp,
 344                struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt);
 345
 346static inline bool
 347is_ds_only_client(struct nfs_client *clp)
 348{
 349        return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) ==
 350                EXCHGID4_FLAG_USE_PNFS_DS;
 351}
 352
 353static inline bool
 354is_ds_client(struct nfs_client *clp)
 355{
 356        return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS;
 357}
 358
 359static inline bool
 360_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 361                    struct rpc_clnt **clntp, struct rpc_message *msg)
 362{
 363        rpc_authflavor_t flavor;
 364
 365        if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP ||
 366            sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) {
 367                /* Using machine creds for cleanup operations
 368                 * is only relevent if the client credentials
 369                 * might expire. So don't bother for
 370                 * RPC_AUTH_UNIX.  If file was only exported to
 371                 * sec=sys, the PUTFH would fail anyway.
 372                 */
 373                if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX)
 374                        return false;
 375        }
 376        if (test_bit(sp4_mode, &clp->cl_sp4_flags)) {
 377                msg->rpc_cred = rpc_machine_cred();
 378
 379                flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 380                WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I &&
 381                             flavor != RPC_AUTH_GSS_KRB5P);
 382                *clntp = clp->cl_rpcclient;
 383
 384                return true;
 385        }
 386        return false;
 387}
 388
 389/*
 390 * Function responsible for determining if an rpc_message should use the
 391 * machine cred under SP4_MACH_CRED and if so switching the credential and
 392 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p).
 393 * Should be called before rpc_call_sync/rpc_call_async.
 394 */
 395static inline void
 396nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode,
 397                   struct rpc_clnt **clntp, struct rpc_message *msg)
 398{
 399        _nfs4_state_protect(clp, sp4_mode, clntp, msg);
 400}
 401
 402/*
 403 * Special wrapper to nfs4_state_protect for write.
 404 * If WRITE can use machine cred but COMMIT cannot, make sure all writes
 405 * that use machine cred use NFS_FILE_SYNC.
 406 */
 407static inline void
 408nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 409                         struct rpc_message *msg, struct nfs_pgio_header *hdr)
 410{
 411        if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) &&
 412            !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags))
 413                hdr->args.stable = NFS_FILE_SYNC;
 414}
 415#else /* CONFIG_NFS_v4_1 */
 416static inline bool
 417is_ds_only_client(struct nfs_client *clp)
 418{
 419        return false;
 420}
 421
 422static inline bool
 423is_ds_client(struct nfs_client *clp)
 424{
 425        return false;
 426}
 427
 428static inline void
 429nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags,
 430                   struct rpc_clnt **clntp, struct rpc_message *msg)
 431{
 432}
 433
 434static inline void
 435nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp,
 436                         struct rpc_message *msg, struct nfs_pgio_header *hdr)
 437{
 438}
 439#endif /* CONFIG_NFS_V4_1 */
 440
 441extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[];
 442
 443extern const u32 nfs4_fattr_bitmap[3];
 444extern const u32 nfs4_statfs_bitmap[3];
 445extern const u32 nfs4_pathconf_bitmap[3];
 446extern const u32 nfs4_fsinfo_bitmap[3];
 447extern const u32 nfs4_fs_locations_bitmap[3];
 448
 449void nfs40_shutdown_client(struct nfs_client *);
 450void nfs41_shutdown_client(struct nfs_client *);
 451int nfs40_init_client(struct nfs_client *);
 452int nfs41_init_client(struct nfs_client *);
 453void nfs4_free_client(struct nfs_client *);
 454
 455struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
 456
 457/* nfs4renewd.c */
 458extern void nfs4_schedule_state_renewal(struct nfs_client *);
 459extern void nfs4_renewd_prepare_shutdown(struct nfs_server *);
 460extern void nfs4_kill_renewd(struct nfs_client *);
 461extern void nfs4_renew_state(struct work_struct *);
 462extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease);
 463
 464
 465/* nfs4state.c */
 466extern const nfs4_stateid current_stateid;
 467
 468const struct cred *nfs4_get_clid_cred(struct nfs_client *clp);
 469const struct cred *nfs4_get_machine_cred(struct nfs_client *clp);
 470const struct cred *nfs4_get_renew_cred(struct nfs_client *clp);
 471int nfs4_discover_server_trunking(struct nfs_client *clp,
 472                        struct nfs_client **);
 473int nfs40_discover_server_trunking(struct nfs_client *clp,
 474                        struct nfs_client **, const struct cred *);
 475#if defined(CONFIG_NFS_V4_1)
 476int nfs41_discover_server_trunking(struct nfs_client *clp,
 477                        struct nfs_client **, const struct cred *);
 478extern void nfs4_schedule_session_recovery(struct nfs4_session *, int);
 479extern void nfs41_notify_server(struct nfs_client *);
 480bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
 481                        struct nfs41_server_owner *o2);
 482#else
 483static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err)
 484{
 485}
 486#endif /* CONFIG_NFS_V4_1 */
 487
 488extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t);
 489extern void nfs4_put_state_owner(struct nfs4_state_owner *);
 490extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *);
 491extern void nfs4_free_state_owners(struct list_head *head);
 492extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *);
 493extern void nfs4_put_open_state(struct nfs4_state *);
 494extern void nfs4_close_state(struct nfs4_state *, fmode_t);
 495extern void nfs4_close_sync(struct nfs4_state *, fmode_t);
 496extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t);
 497extern void nfs_inode_find_state_and_recover(struct inode *inode,
 498                const nfs4_stateid *stateid);
 499extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *);
 500extern void nfs4_schedule_lease_recovery(struct nfs_client *);
 501extern int nfs4_wait_clnt_recover(struct nfs_client *clp);
 502extern int nfs4_client_recover_expired_lease(struct nfs_client *clp);
 503extern void nfs4_schedule_state_manager(struct nfs_client *);
 504extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
 505extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
 506extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
 507extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
 508extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
 509extern void nfs41_handle_server_scope(struct nfs_client *,
 510                                      struct nfs41_server_scope **);
 511extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
 512extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
 513extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
 514                const struct nfs_lock_context *, nfs4_stateid *,
 515                const struct cred **);
 516extern bool nfs4_copy_open_stateid(nfs4_stateid *dst,
 517                struct nfs4_state *state);
 518
 519extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);
 520extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task);
 521extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid);
 522extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid);
 523extern void nfs_release_seqid(struct nfs_seqid *seqid);
 524extern void nfs_free_seqid(struct nfs_seqid *seqid);
 525extern int nfs4_setup_sequence(struct nfs_client *client,
 526                                struct nfs4_sequence_args *args,
 527                                struct nfs4_sequence_res *res,
 528                                struct rpc_task *task);
 529extern int nfs4_sequence_done(struct rpc_task *task,
 530                              struct nfs4_sequence_res *res);
 531
 532extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp);
 533extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res);
 534extern const nfs4_stateid zero_stateid;
 535extern const nfs4_stateid invalid_stateid;
 536
 537/* nfs4super.c */
 538struct nfs_mount_info;
 539extern struct nfs_subversion nfs_v4;
 540extern bool nfs4_disable_idmapping;
 541extern unsigned short max_session_slots;
 542extern unsigned short max_session_cb_slots;
 543extern unsigned short send_implementation_id;
 544extern bool recover_lost_locks;
 545
 546#define NFS4_CLIENT_ID_UNIQ_LEN         (64)
 547extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN];
 548
 549extern int nfs4_try_get_tree(struct fs_context *);
 550extern int nfs4_get_referral_tree(struct fs_context *);
 551
 552/* nfs4sysctl.c */
 553#ifdef CONFIG_SYSCTL
 554int nfs4_register_sysctl(void);
 555void nfs4_unregister_sysctl(void);
 556#else
 557static inline int nfs4_register_sysctl(void)
 558{
 559        return 0;
 560}
 561
 562static inline void nfs4_unregister_sysctl(void)
 563{
 564}
 565#endif
 566
 567/* nfs4xdr.c */
 568extern const struct rpc_procinfo nfs4_procedures[];
 569
 570#ifdef CONFIG_NFS_V4_2
 571extern const u32 nfs42_maxsetxattr_overhead;
 572extern const u32 nfs42_maxgetxattr_overhead;
 573extern const u32 nfs42_maxlistxattrs_overhead;
 574#endif
 575
 576struct nfs4_mount_data;
 577
 578/* callback_xdr.c */
 579extern const struct svc_version nfs4_callback_version1;
 580extern const struct svc_version nfs4_callback_version4;
 581
 582static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src)
 583{
 584        memcpy(dst->data, src->data, sizeof(dst->data));
 585        dst->type = src->type;
 586}
 587
 588static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src)
 589{
 590        if (dst->type != src->type)
 591                return false;
 592        return memcmp(dst->data, src->data, sizeof(dst->data)) == 0;
 593}
 594
 595static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src)
 596{
 597        return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0;
 598}
 599
 600static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2)
 601{
 602        return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0;
 603}
 604
 605static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2)
 606{
 607        u32 seq1 = be32_to_cpu(s1->seqid);
 608        u32 seq2 = be32_to_cpu(s2->seqid);
 609
 610        return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU);
 611}
 612
 613static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src)
 614{
 615        return nfs4_stateid_match_other(dst, src) &&
 616                !(src->seqid && nfs4_stateid_is_newer(dst, src));
 617}
 618
 619static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1)
 620{
 621        u32 seqid = be32_to_cpu(s1->seqid);
 622
 623        if (++seqid == 0)
 624                ++seqid;
 625        s1->seqid = cpu_to_be32(seqid);
 626}
 627
 628static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state)
 629{
 630        return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0;
 631}
 632
 633static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state,
 634                const nfs4_stateid *stateid)
 635{
 636        return test_bit(NFS_OPEN_STATE, &state->flags) &&
 637                nfs4_stateid_match_other(&state->open_stateid, stateid);
 638}
 639
 640/* nfs42xattr.c */
 641#ifdef CONFIG_NFS_V4_2
 642extern int __init nfs4_xattr_cache_init(void);
 643extern void nfs4_xattr_cache_exit(void);
 644extern void nfs4_xattr_cache_add(struct inode *inode, const char *name,
 645                                 const char *buf, struct page **pages,
 646                                 ssize_t buflen);
 647extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name);
 648extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name,
 649                                char *buf, ssize_t buflen);
 650extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf,
 651                                      ssize_t buflen);
 652extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf,
 653                                     ssize_t buflen);
 654extern void nfs4_xattr_cache_zap(struct inode *inode);
 655#else
 656static inline void nfs4_xattr_cache_zap(struct inode *inode)
 657{
 658}
 659#endif /* CONFIG_NFS_V4_2 */
 660
 661#else /* CONFIG_NFS_V4 */
 662
 663#define nfs4_close_state(a, b) do { } while (0)
 664#define nfs4_close_sync(a, b) do { } while (0)
 665#define nfs4_state_protect(a, b, c, d) do { } while (0)
 666#define nfs4_state_protect_write(a, b, c, d) do { } while (0)
 667
 668
 669#endif /* CONFIG_NFS_V4 */
 670#endif /* __LINUX_FS_NFS_NFS4_FS.H */
 671
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