linux/fs/nfsd/nfsd.h
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   1/*
   2 * Hodge-podge collection of knfsd-related stuff.
   3 * I will sort this out later.
   4 *
   5 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   6 */
   7
   8#ifndef LINUX_NFSD_NFSD_H
   9#define LINUX_NFSD_NFSD_H
  10
  11#include <linux/types.h>
  12#include <linux/mount.h>
  13
  14#include <linux/nfs.h>
  15#include <linux/nfs2.h>
  16#include <linux/nfs3.h>
  17#include <linux/nfs4.h>
  18#include <linux/sunrpc/msg_prot.h>
  19
  20#include <linux/nfsd/debug.h>
  21#include <linux/nfsd/export.h>
  22#include <linux/nfsd/stats.h>
  23
  24/*
  25 * nfsd version
  26 */
  27#define NFSD_SUPPORTED_MINOR_VERSION    1
  28/*
  29 * Maximum blocksizes supported by daemon under various circumstances.
  30 */
  31#define NFSSVC_MAXBLKSIZE       RPCSVC_MAXPAYLOAD
  32/* NFSv2 is limited by the protocol specification, see RFC 1094 */
  33#define NFSSVC_MAXBLKSIZE_V2    (8*1024)
  34
  35
  36/*
  37 * Largest number of bytes we need to allocate for an NFS
  38 * call or reply.  Used to control buffer sizes.  We use
  39 * the length of v3 WRITE, READDIR and READDIR replies
  40 * which are an RPC header, up to 26 XDR units of reply
  41 * data, and some page data.
  42 *
  43 * Note that accuracy here doesn't matter too much as the
  44 * size is rounded up to a page size when allocating space.
  45 */
  46#define NFSD_BUFSIZE            ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
  47
  48struct readdir_cd {
  49        __be32                  err;    /* 0, nfserr, or nfserr_eof */
  50};
  51
  52
  53extern struct svc_program       nfsd_program;
  54extern struct svc_version       nfsd_version2, nfsd_version3,
  55                                nfsd_version4;
  56extern u32                      nfsd_supported_minorversion;
  57extern struct mutex             nfsd_mutex;
  58extern struct svc_serv          *nfsd_serv;
  59extern spinlock_t               nfsd_drc_lock;
  60extern unsigned int             nfsd_drc_max_mem;
  61extern unsigned int             nfsd_drc_mem_used;
  62
  63extern const struct seq_operations nfs_exports_op;
  64
  65/*
  66 * Function prototypes.
  67 */
  68int             nfsd_svc(int nrservs);
  69int             nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
  70
  71int             nfsd_nrthreads(void);
  72int             nfsd_nrpools(void);
  73int             nfsd_get_nrthreads(int n, int *);
  74int             nfsd_set_nrthreads(int n, int *);
  75int             nfsd_pool_stats_open(struct inode *, struct file *);
  76int             nfsd_pool_stats_release(struct inode *, struct file *);
  77
  78static inline void nfsd_destroy(struct net *net)
  79{
  80        int destroy = (nfsd_serv->sv_nrthreads == 1);
  81
  82        if (destroy)
  83                svc_shutdown_net(nfsd_serv, net);
  84        svc_destroy(nfsd_serv);
  85        if (destroy)
  86                nfsd_serv = NULL;
  87}
  88
  89#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
  90#ifdef CONFIG_NFSD_V2_ACL
  91extern struct svc_version nfsd_acl_version2;
  92#else
  93#define nfsd_acl_version2 NULL
  94#endif
  95#ifdef CONFIG_NFSD_V3_ACL
  96extern struct svc_version nfsd_acl_version3;
  97#else
  98#define nfsd_acl_version3 NULL
  99#endif
 100#endif
 101
 102enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
 103int nfsd_vers(int vers, enum vers_op change);
 104int nfsd_minorversion(u32 minorversion, enum vers_op change);
 105void nfsd_reset_versions(void);
 106int nfsd_create_serv(void);
 107
 108extern int nfsd_max_blksize;
 109
 110static inline int nfsd_v4client(struct svc_rqst *rq)
 111{
 112        return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
 113}
 114
 115/* 
 116 * NFSv4 State
 117 */
 118#ifdef CONFIG_NFSD_V4
 119extern unsigned int max_delegations;
 120void nfs4_state_init(void);
 121int nfsd4_init_slabs(void);
 122void nfsd4_free_slabs(void);
 123int nfs4_state_start(void);
 124void nfs4_state_shutdown(void);
 125void nfs4_reset_lease(time_t leasetime);
 126int nfs4_reset_recoverydir(char *recdir);
 127char * nfs4_recoverydir(void);
 128#else
 129static inline void nfs4_state_init(void) { }
 130static inline int nfsd4_init_slabs(void) { return 0; }
 131static inline void nfsd4_free_slabs(void) { }
 132static inline int nfs4_state_start(void) { return 0; }
 133static inline void nfs4_state_shutdown(void) { }
 134static inline void nfs4_reset_lease(time_t leasetime) { }
 135static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
 136static inline char * nfs4_recoverydir(void) {return NULL; }
 137#endif
 138
 139/*
 140 * lockd binding
 141 */
 142void            nfsd_lockd_init(void);
 143void            nfsd_lockd_shutdown(void);
 144
 145
 146/*
 147 * These macros provide pre-xdr'ed values for faster operation.
 148 */
 149#define nfs_ok                  cpu_to_be32(NFS_OK)
 150#define nfserr_perm             cpu_to_be32(NFSERR_PERM)
 151#define nfserr_noent            cpu_to_be32(NFSERR_NOENT)
 152#define nfserr_io               cpu_to_be32(NFSERR_IO)
 153#define nfserr_nxio             cpu_to_be32(NFSERR_NXIO)
 154#define nfserr_eagain           cpu_to_be32(NFSERR_EAGAIN)
 155#define nfserr_acces            cpu_to_be32(NFSERR_ACCES)
 156#define nfserr_exist            cpu_to_be32(NFSERR_EXIST)
 157#define nfserr_xdev             cpu_to_be32(NFSERR_XDEV)
 158#define nfserr_nodev            cpu_to_be32(NFSERR_NODEV)
 159#define nfserr_notdir           cpu_to_be32(NFSERR_NOTDIR)
 160#define nfserr_isdir            cpu_to_be32(NFSERR_ISDIR)
 161#define nfserr_inval            cpu_to_be32(NFSERR_INVAL)
 162#define nfserr_fbig             cpu_to_be32(NFSERR_FBIG)
 163#define nfserr_nospc            cpu_to_be32(NFSERR_NOSPC)
 164#define nfserr_rofs             cpu_to_be32(NFSERR_ROFS)
 165#define nfserr_mlink            cpu_to_be32(NFSERR_MLINK)
 166#define nfserr_opnotsupp        cpu_to_be32(NFSERR_OPNOTSUPP)
 167#define nfserr_nametoolong      cpu_to_be32(NFSERR_NAMETOOLONG)
 168#define nfserr_notempty         cpu_to_be32(NFSERR_NOTEMPTY)
 169#define nfserr_dquot            cpu_to_be32(NFSERR_DQUOT)
 170#define nfserr_stale            cpu_to_be32(NFSERR_STALE)
 171#define nfserr_remote           cpu_to_be32(NFSERR_REMOTE)
 172#define nfserr_wflush           cpu_to_be32(NFSERR_WFLUSH)
 173#define nfserr_badhandle        cpu_to_be32(NFSERR_BADHANDLE)
 174#define nfserr_notsync          cpu_to_be32(NFSERR_NOT_SYNC)
 175#define nfserr_badcookie        cpu_to_be32(NFSERR_BAD_COOKIE)
 176#define nfserr_notsupp          cpu_to_be32(NFSERR_NOTSUPP)
 177#define nfserr_toosmall         cpu_to_be32(NFSERR_TOOSMALL)
 178#define nfserr_serverfault      cpu_to_be32(NFSERR_SERVERFAULT)
 179#define nfserr_badtype          cpu_to_be32(NFSERR_BADTYPE)
 180#define nfserr_jukebox          cpu_to_be32(NFSERR_JUKEBOX)
 181#define nfserr_denied           cpu_to_be32(NFSERR_DENIED)
 182#define nfserr_deadlock         cpu_to_be32(NFSERR_DEADLOCK)
 183#define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
 184#define nfserr_bad_cookie       cpu_to_be32(NFSERR_BAD_COOKIE)
 185#define nfserr_same             cpu_to_be32(NFSERR_SAME)
 186#define nfserr_clid_inuse       cpu_to_be32(NFSERR_CLID_INUSE)
 187#define nfserr_stale_clientid   cpu_to_be32(NFSERR_STALE_CLIENTID)
 188#define nfserr_resource         cpu_to_be32(NFSERR_RESOURCE)
 189#define nfserr_moved            cpu_to_be32(NFSERR_MOVED)
 190#define nfserr_nofilehandle     cpu_to_be32(NFSERR_NOFILEHANDLE)
 191#define nfserr_minor_vers_mismatch      cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
 192#define nfserr_share_denied     cpu_to_be32(NFSERR_SHARE_DENIED)
 193#define nfserr_stale_stateid    cpu_to_be32(NFSERR_STALE_STATEID)
 194#define nfserr_old_stateid      cpu_to_be32(NFSERR_OLD_STATEID)
 195#define nfserr_bad_stateid      cpu_to_be32(NFSERR_BAD_STATEID)
 196#define nfserr_bad_seqid        cpu_to_be32(NFSERR_BAD_SEQID)
 197#define nfserr_symlink          cpu_to_be32(NFSERR_SYMLINK)
 198#define nfserr_not_same         cpu_to_be32(NFSERR_NOT_SAME)
 199#define nfserr_lock_range       cpu_to_be32(NFSERR_LOCK_RANGE)
 200#define nfserr_restorefh        cpu_to_be32(NFSERR_RESTOREFH)
 201#define nfserr_attrnotsupp      cpu_to_be32(NFSERR_ATTRNOTSUPP)
 202#define nfserr_bad_xdr          cpu_to_be32(NFSERR_BAD_XDR)
 203#define nfserr_openmode         cpu_to_be32(NFSERR_OPENMODE)
 204#define nfserr_badowner         cpu_to_be32(NFSERR_BADOWNER)
 205#define nfserr_locks_held       cpu_to_be32(NFSERR_LOCKS_HELD)
 206#define nfserr_op_illegal       cpu_to_be32(NFSERR_OP_ILLEGAL)
 207#define nfserr_grace            cpu_to_be32(NFSERR_GRACE)
 208#define nfserr_no_grace         cpu_to_be32(NFSERR_NO_GRACE)
 209#define nfserr_reclaim_bad      cpu_to_be32(NFSERR_RECLAIM_BAD)
 210#define nfserr_badname          cpu_to_be32(NFSERR_BADNAME)
 211#define nfserr_cb_path_down     cpu_to_be32(NFSERR_CB_PATH_DOWN)
 212#define nfserr_locked           cpu_to_be32(NFSERR_LOCKED)
 213#define nfserr_wrongsec         cpu_to_be32(NFSERR_WRONGSEC)
 214#define nfserr_badiomode                cpu_to_be32(NFS4ERR_BADIOMODE)
 215#define nfserr_badlayout                cpu_to_be32(NFS4ERR_BADLAYOUT)
 216#define nfserr_bad_session_digest       cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
 217#define nfserr_badsession               cpu_to_be32(NFS4ERR_BADSESSION)
 218#define nfserr_badslot                  cpu_to_be32(NFS4ERR_BADSLOT)
 219#define nfserr_complete_already         cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
 220#define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
 221#define nfserr_deleg_already_wanted     cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
 222#define nfserr_back_chan_busy           cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
 223#define nfserr_layouttrylater           cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
 224#define nfserr_layoutunavailable        cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
 225#define nfserr_nomatching_layout        cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
 226#define nfserr_recallconflict           cpu_to_be32(NFS4ERR_RECALLCONFLICT)
 227#define nfserr_unknown_layouttype       cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
 228#define nfserr_seq_misordered           cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
 229#define nfserr_sequence_pos             cpu_to_be32(NFS4ERR_SEQUENCE_POS)
 230#define nfserr_req_too_big              cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
 231#define nfserr_rep_too_big              cpu_to_be32(NFS4ERR_REP_TOO_BIG)
 232#define nfserr_rep_too_big_to_cache     cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
 233#define nfserr_retry_uncached_rep       cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
 234#define nfserr_unsafe_compound          cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
 235#define nfserr_too_many_ops             cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
 236#define nfserr_op_not_in_session        cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
 237#define nfserr_hash_alg_unsupp          cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
 238#define nfserr_clientid_busy            cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
 239#define nfserr_pnfs_io_hole             cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
 240#define nfserr_seq_false_retry          cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
 241#define nfserr_bad_high_slot            cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
 242#define nfserr_deadsession              cpu_to_be32(NFS4ERR_DEADSESSION)
 243#define nfserr_encr_alg_unsupp          cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
 244#define nfserr_pnfs_no_layout           cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
 245#define nfserr_not_only_op              cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
 246#define nfserr_wrong_cred               cpu_to_be32(NFS4ERR_WRONG_CRED)
 247#define nfserr_wrong_type               cpu_to_be32(NFS4ERR_WRONG_TYPE)
 248#define nfserr_dirdeleg_unavail         cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
 249#define nfserr_reject_deleg             cpu_to_be32(NFS4ERR_REJECT_DELEG)
 250#define nfserr_returnconflict           cpu_to_be32(NFS4ERR_RETURNCONFLICT)
 251#define nfserr_deleg_revoked            cpu_to_be32(NFS4ERR_DELEG_REVOKED)
 252
 253/* error codes for internal use */
 254/* if a request fails due to kmalloc failure, it gets dropped.
 255 *  Client should resend eventually
 256 */
 257#define nfserr_dropit           cpu_to_be32(30000)
 258/* end-of-file indicator in readdir */
 259#define nfserr_eof              cpu_to_be32(30001)
 260/* replay detected */
 261#define nfserr_replay_me        cpu_to_be32(11001)
 262/* nfs41 replay detected */
 263#define nfserr_replay_cache     cpu_to_be32(11002)
 264
 265/* Check for dir entries '.' and '..' */
 266#define isdotent(n, l)  (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
 267
 268/*
 269 * Time of server startup
 270 */
 271extern struct timeval   nfssvc_boot;
 272
 273#ifdef CONFIG_NFSD_V4
 274
 275extern time_t nfsd4_lease;
 276extern time_t nfsd4_grace;
 277
 278/* before processing a COMPOUND operation, we have to check that there
 279 * is enough space in the buffer for XDR encode to succeed.  otherwise,
 280 * we might process an operation with side effects, and be unable to
 281 * tell the client that the operation succeeded.
 282 *
 283 * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
 284 * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
 285 * READ, READDIR, and READLINK have their own buffer checks.)  if we
 286 * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
 287 *
 288 * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
 289 * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
 290 * care is taken to ensure that we never fall below this level for any
 291 * reason.
 292 */
 293#define COMPOUND_SLACK_SPACE            140    /* OP_GETFH */
 294#define COMPOUND_ERR_SLACK_SPACE        12     /* OP_SETATTR */
 295
 296#define NFSD_LAUNDROMAT_MINTIMEOUT      1   /* seconds */
 297
 298/*
 299 * The following attributes are currently not supported by the NFSv4 server:
 300 *    ARCHIVE       (deprecated anyway)
 301 *    HIDDEN        (unlikely to be supported any time soon)
 302 *    MIMETYPE      (unlikely to be supported any time soon)
 303 *    QUOTA_*       (will be supported in a forthcoming patch)
 304 *    SYSTEM        (unlikely to be supported any time soon)
 305 *    TIME_BACKUP   (unlikely to be supported any time soon)
 306 *    TIME_CREATE   (unlikely to be supported any time soon)
 307 */
 308#define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
 309(FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
 310 | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
 311 | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
 312 | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
 313 | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
 314 | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
 315 | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
 316 | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
 317 | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
 318 | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
 319
 320#define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
 321(FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
 322 | FATTR4_WORD1_OWNER           | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
 323 | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
 324 | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
 325 | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
 326 | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
 327
 328#define NFSD4_SUPPORTED_ATTRS_WORD2 0
 329
 330#define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
 331        NFSD4_SUPPORTED_ATTRS_WORD0
 332
 333#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
 334        NFSD4_SUPPORTED_ATTRS_WORD1
 335
 336#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
 337        (NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
 338
 339static inline u32 nfsd_suppattrs0(u32 minorversion)
 340{
 341        return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
 342                            : NFSD4_SUPPORTED_ATTRS_WORD0;
 343}
 344
 345static inline u32 nfsd_suppattrs1(u32 minorversion)
 346{
 347        return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
 348                            : NFSD4_SUPPORTED_ATTRS_WORD1;
 349}
 350
 351static inline u32 nfsd_suppattrs2(u32 minorversion)
 352{
 353        return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
 354                            : NFSD4_SUPPORTED_ATTRS_WORD2;
 355}
 356
 357/* These will return ERR_INVAL if specified in GETATTR or READDIR. */
 358#define NFSD_WRITEONLY_ATTRS_WORD1 \
 359        (FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
 360
 361/* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
 362#define NFSD_WRITEABLE_ATTRS_WORD0 \
 363        (FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
 364#define NFSD_WRITEABLE_ATTRS_WORD1 \
 365        (FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
 366        | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
 367#define NFSD_WRITEABLE_ATTRS_WORD2 0
 368
 369#define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
 370        NFSD_WRITEABLE_ATTRS_WORD0
 371/*
 372 * we currently store the exclusive create verifier in the v_{a,m}time
 373 * attributes so the client can't set these at create time using EXCLUSIVE4_1
 374 */
 375#define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
 376        (NFSD_WRITEABLE_ATTRS_WORD1 & \
 377         ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
 378#define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
 379        NFSD_WRITEABLE_ATTRS_WORD2
 380
 381extern int nfsd4_is_junction(struct dentry *dentry);
 382extern int register_cld_notifier(void);
 383extern void unregister_cld_notifier(void);
 384#else /* CONFIG_NFSD_V4 */
 385static inline int nfsd4_is_junction(struct dentry *dentry)
 386{
 387        return 0;
 388}
 389
 390#define register_cld_notifier() 0
 391#define unregister_cld_notifier() do { } while(0)
 392
 393#endif /* CONFIG_NFSD_V4 */
 394
 395#endif /* LINUX_NFSD_NFSD_H */
 396
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