text: /*
   * Hodge-podge collection of knfsd-related stuff.
   * I will sort this out later.
   *
   * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   */
  
  #ifndef LINUX_NFSD_NFSD_H
  #define LINUX_NFSD_NFSD_H
  
  #include <linux/types.h>
  #include <linux/mount.h>
  
  #include <linux/nfsd/debug.h>
  #include <linux/nfsd/export.h>
  #include <linux/nfsd/stats.h>
  /*
   * nfsd version
   */
  #define NFSD_SUPPORTED_MINOR_VERSION	1
  
  struct readdir_cd {
  	__be32			err;	/* 0, nfserr, or nfserr_eof */
  };
  
  
  extern struct svc_program	nfsd_program;
  extern struct svc_version	nfsd_version2, nfsd_version3,
  				nfsd_version4;
  extern u32			nfsd_supported_minorversion;
  extern struct mutex		nfsd_mutex;
  extern struct svc_serv		*nfsd_serv;
  extern spinlock_t		nfsd_drc_lock;
  extern unsigned int		nfsd_drc_max_mem;
  extern unsigned int		nfsd_drc_mem_used;
  
  extern const struct seq_operations nfs_exports_op;
  
  /*
   * Function prototypes.
   */
  int		nfsd_svc(unsigned short port, int nrservs);
  int		nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
  
  int		nfsd_nrthreads(void);
  int		nfsd_nrpools(void);
  int		nfsd_get_nrthreads(int n, int *);
  int		nfsd_set_nrthreads(int n, int *);
  
  #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
  #ifdef CONFIG_NFSD_V2_ACL
  extern struct svc_version nfsd_acl_version2;
  #else
  #define nfsd_acl_version2 NULL
  #endif
  #ifdef CONFIG_NFSD_V3_ACL
  extern struct svc_version nfsd_acl_version3;
  #else
  #define nfsd_acl_version3 NULL
  #endif
  #endif
  
  enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
  int nfsd_vers(int vers, enum vers_op change);
  int nfsd_minorversion(u32 minorversion, enum vers_op change);
  void nfsd_reset_versions(void);
  int nfsd_create_serv(void);
  
  extern int nfsd_max_blksize;
  
  static inline int nfsd_v4client(struct svc_rqst *rq)
  {
  	return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
  }
  
  /* 
   * NFSv4 State
   */
  #ifdef CONFIG_NFSD_V4
  extern unsigned int max_delegations;
  int nfs4_state_init(void);
  void nfsd4_free_slabs(void);
  int nfs4_state_start(void);
  void nfs4_state_shutdown(void);
  void nfs4_reset_lease(time_t leasetime);
  int nfs4_reset_recoverydir(char *recdir);
  #else
  static inline int nfs4_state_init(void) { return 0; }
  static inline void nfsd4_free_slabs(void) { }
  static inline int nfs4_state_start(void) { return 0; }
  static inline void nfs4_state_shutdown(void) { }
  static inline void nfs4_reset_lease(time_t leasetime) { }
  static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
  #endif
  
  /*
   * lockd binding
   */
  void		nfsd_lockd_init(void);
  void		nfsd_lockd_shutdown(void);
  
  
  /*
   * These macros provide pre-xdr'ed values for faster operation.
   */
  #define	nfs_ok			cpu_to_be32(NFS_OK)
  #define	nfserr_perm		cpu_to_be32(NFSERR_PERM)
  #define	nfserr_noent		cpu_to_be32(NFSERR_NOENT)
  #define	nfserr_io		cpu_to_be32(NFSERR_IO)
  #define	nfserr_nxio		cpu_to_be32(NFSERR_NXIO)
  #define	nfserr_eagain		cpu_to_be32(NFSERR_EAGAIN)
  #define	nfserr_acces		cpu_to_be32(NFSERR_ACCES)
  #define	nfserr_exist		cpu_to_be32(NFSERR_EXIST)
  #define	nfserr_xdev		cpu_to_be32(NFSERR_XDEV)
  #define	nfserr_nodev		cpu_to_be32(NFSERR_NODEV)
  #define	nfserr_notdir		cpu_to_be32(NFSERR_NOTDIR)
  #define	nfserr_isdir		cpu_to_be32(NFSERR_ISDIR)
  #define	nfserr_inval		cpu_to_be32(NFSERR_INVAL)
  #define	nfserr_fbig		cpu_to_be32(NFSERR_FBIG)
  #define	nfserr_nospc		cpu_to_be32(NFSERR_NOSPC)
  #define	nfserr_rofs		cpu_to_be32(NFSERR_ROFS)
  #define	nfserr_mlink		cpu_to_be32(NFSERR_MLINK)
  #define	nfserr_opnotsupp	cpu_to_be32(NFSERR_OPNOTSUPP)
  #define	nfserr_nametoolong	cpu_to_be32(NFSERR_NAMETOOLONG)
  #define	nfserr_notempty		cpu_to_be32(NFSERR_NOTEMPTY)
  #define	nfserr_dquot		cpu_to_be32(NFSERR_DQUOT)
  #define	nfserr_stale		cpu_to_be32(NFSERR_STALE)
  #define	nfserr_remote		cpu_to_be32(NFSERR_REMOTE)
  #define	nfserr_wflush		cpu_to_be32(NFSERR_WFLUSH)
  #define	nfserr_badhandle	cpu_to_be32(NFSERR_BADHANDLE)
  #define	nfserr_notsync		cpu_to_be32(NFSERR_NOT_SYNC)
  #define	nfserr_badcookie	cpu_to_be32(NFSERR_BAD_COOKIE)
  #define	nfserr_notsupp		cpu_to_be32(NFSERR_NOTSUPP)
  #define	nfserr_toosmall		cpu_to_be32(NFSERR_TOOSMALL)
  #define	nfserr_serverfault	cpu_to_be32(NFSERR_SERVERFAULT)
  #define	nfserr_badtype		cpu_to_be32(NFSERR_BADTYPE)
  #define	nfserr_jukebox		cpu_to_be32(NFSERR_JUKEBOX)
  #define	nfserr_denied		cpu_to_be32(NFSERR_DENIED)
  #define	nfserr_deadlock		cpu_to_be32(NFSERR_DEADLOCK)
  #define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
  #define	nfserr_bad_cookie	cpu_to_be32(NFSERR_BAD_COOKIE)
  #define	nfserr_same		cpu_to_be32(NFSERR_SAME)
  #define	nfserr_clid_inuse	cpu_to_be32(NFSERR_CLID_INUSE)
  #define	nfserr_stale_clientid	cpu_to_be32(NFSERR_STALE_CLIENTID)
  #define	nfserr_resource		cpu_to_be32(NFSERR_RESOURCE)
  #define	nfserr_moved		cpu_to_be32(NFSERR_MOVED)
  #define	nfserr_nofilehandle	cpu_to_be32(NFSERR_NOFILEHANDLE)
  #define	nfserr_minor_vers_mismatch	cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
  #define nfserr_share_denied	cpu_to_be32(NFSERR_SHARE_DENIED)
  #define nfserr_stale_stateid	cpu_to_be32(NFSERR_STALE_STATEID)
  #define nfserr_old_stateid	cpu_to_be32(NFSERR_OLD_STATEID)
  #define nfserr_bad_stateid	cpu_to_be32(NFSERR_BAD_STATEID)
  #define nfserr_bad_seqid	cpu_to_be32(NFSERR_BAD_SEQID)
  #define	nfserr_symlink		cpu_to_be32(NFSERR_SYMLINK)
  #define	nfserr_not_same		cpu_to_be32(NFSERR_NOT_SAME)
  #define nfserr_lock_range	cpu_to_be32(NFSERR_LOCK_RANGE)
  #define	nfserr_restorefh	cpu_to_be32(NFSERR_RESTOREFH)
  #define	nfserr_attrnotsupp	cpu_to_be32(NFSERR_ATTRNOTSUPP)
  #define	nfserr_bad_xdr		cpu_to_be32(NFSERR_BAD_XDR)
  #define	nfserr_openmode		cpu_to_be32(NFSERR_OPENMODE)
  #define	nfserr_locks_held	cpu_to_be32(NFSERR_LOCKS_HELD)
  #define	nfserr_op_illegal	cpu_to_be32(NFSERR_OP_ILLEGAL)
  #define	nfserr_grace		cpu_to_be32(NFSERR_GRACE)
  #define	nfserr_no_grace		cpu_to_be32(NFSERR_NO_GRACE)
  #define	nfserr_reclaim_bad	cpu_to_be32(NFSERR_RECLAIM_BAD)
  #define	nfserr_badname		cpu_to_be32(NFSERR_BADNAME)
  #define	nfserr_cb_path_down	cpu_to_be32(NFSERR_CB_PATH_DOWN)
  #define	nfserr_locked		cpu_to_be32(NFSERR_LOCKED)
  #define	nfserr_wrongsec		cpu_to_be32(NFSERR_WRONGSEC)
  #define nfserr_badiomode		cpu_to_be32(NFS4ERR_BADIOMODE)
  #define nfserr_badlayout		cpu_to_be32(NFS4ERR_BADLAYOUT)
  #define nfserr_bad_session_digest	cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
  #define nfserr_badsession		cpu_to_be32(NFS4ERR_BADSESSION)
  #define nfserr_badslot			cpu_to_be32(NFS4ERR_BADSLOT)
  #define nfserr_complete_already		cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
  #define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
  #define nfserr_deleg_already_wanted	cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
  #define nfserr_back_chan_busy		cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
  #define nfserr_layouttrylater		cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
  #define nfserr_layoutunavailable	cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
  #define nfserr_nomatching_layout	cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
  #define nfserr_recallconflict		cpu_to_be32(NFS4ERR_RECALLCONFLICT)
  #define nfserr_unknown_layouttype	cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
  #define nfserr_seq_misordered		cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
  #define nfserr_sequence_pos		cpu_to_be32(NFS4ERR_SEQUENCE_POS)
  #define nfserr_req_too_big		cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
  #define nfserr_rep_too_big		cpu_to_be32(NFS4ERR_REP_TOO_BIG)
  #define nfserr_rep_too_big_to_cache	cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
  #define nfserr_retry_uncached_rep	cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
  #define nfserr_unsafe_compound		cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
  #define nfserr_too_many_ops		cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
  #define nfserr_op_not_in_session	cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
  #define nfserr_hash_alg_unsupp		cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
  #define nfserr_clientid_busy		cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
  #define nfserr_pnfs_io_hole		cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
  #define nfserr_seq_false_retry		cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
  #define nfserr_bad_high_slot		cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
  #define nfserr_deadsession		cpu_to_be32(NFS4ERR_DEADSESSION)
  #define nfserr_encr_alg_unsupp		cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
  #define nfserr_pnfs_no_layout		cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
  #define nfserr_not_only_op		cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
  #define nfserr_wrong_cred		cpu_to_be32(NFS4ERR_WRONG_CRED)
  #define nfserr_wrong_type		cpu_to_be32(NFS4ERR_WRONG_TYPE)
  #define nfserr_dirdeleg_unavail		cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
  #define nfserr_reject_deleg		cpu_to_be32(NFS4ERR_REJECT_DELEG)
  #define nfserr_returnconflict		cpu_to_be32(NFS4ERR_RETURNCONFLICT)
  #define nfserr_deleg_revoked		cpu_to_be32(NFS4ERR_DELEG_REVOKED)
  
  /* error codes for internal use */
  /* if a request fails due to kmalloc failure, it gets dropped.
   *  Client should resend eventually
   */
  #define	nfserr_dropit		cpu_to_be32(30000)
  /* end-of-file indicator in readdir */
  #define	nfserr_eof		cpu_to_be32(30001)
  /* replay detected */
  #define	nfserr_replay_me	cpu_to_be32(11001)
  /* nfs41 replay detected */
  #define	nfserr_replay_cache	cpu_to_be32(11002)
  
  /* Check for dir entries '.' and '..' */
  #define isdotent(n, l)	(l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
  
  /*
   * Time of server startup
   */
  extern struct timeval	nfssvc_boot;
  
  #ifdef CONFIG_NFSD_V4
  
  extern time_t nfsd4_lease;
  extern time_t nfsd4_grace;
  
  /* before processing a COMPOUND operation, we have to check that there
   * is enough space in the buffer for XDR encode to succeed.  otherwise,
   * we might process an operation with side effects, and be unable to
   * tell the client that the operation succeeded.
   *
   * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
   * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
   * READ, READDIR, and READLINK have their own buffer checks.)  if we
   * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
   *
   * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
   * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
   * care is taken to ensure that we never fall below this level for any
   * reason.
   */
  #define	COMPOUND_SLACK_SPACE		140    /* OP_GETFH */
  #define COMPOUND_ERR_SLACK_SPACE	12     /* OP_SETATTR */
  
  #define NFSD_LAUNDROMAT_MINTIMEOUT      10   /* seconds */
  
  /*
   * The following attributes are currently not supported by the NFSv4 server:
   *    ARCHIVE       (deprecated anyway)
   *    HIDDEN        (unlikely to be supported any time soon)
   *    MIMETYPE      (unlikely to be supported any time soon)
   *    QUOTA_*       (will be supported in a forthcoming patch)
   *    SYSTEM        (unlikely to be supported any time soon)
   *    TIME_BACKUP   (unlikely to be supported any time soon)
   *    TIME_CREATE   (unlikely to be supported any time soon)
   */
  #define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
  (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
   | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
   | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
   | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
   | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
   | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
   | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
   | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
   | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
   | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
  
  #define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
  (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
   | FATTR4_WORD1_OWNER	        | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
   | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
   | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
   | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
   | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
  
  #define NFSD4_SUPPORTED_ATTRS_WORD2 0
  
  #define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
  	NFSD4_SUPPORTED_ATTRS_WORD0
  
  #define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
  	NFSD4_SUPPORTED_ATTRS_WORD1
  
  #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
  	(NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
  
  static inline u32 nfsd_suppattrs0(u32 minorversion)
  {
  	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
  			    : NFSD4_SUPPORTED_ATTRS_WORD0;
  }
  
  static inline u32 nfsd_suppattrs1(u32 minorversion)
  {
  	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
  			    : NFSD4_SUPPORTED_ATTRS_WORD1;
  }
  
  static inline u32 nfsd_suppattrs2(u32 minorversion)
  {
  	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
  			    : NFSD4_SUPPORTED_ATTRS_WORD2;
  }
  
  /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
  #define NFSD_WRITEONLY_ATTRS_WORD1							    \
  (FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
  
  /* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
  #define NFSD_WRITEABLE_ATTRS_WORD0                                                          \
  (FATTR4_WORD0_SIZE              | FATTR4_WORD0_ACL                                         )
  #define NFSD_WRITEABLE_ATTRS_WORD1                                                          \
  (FATTR4_WORD1_MODE              | FATTR4_WORD1_OWNER         | FATTR4_WORD1_OWNER_GROUP     \
   | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
  #define NFSD_WRITEABLE_ATTRS_WORD2 0
  
  #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
  	NFSD_WRITEABLE_ATTRS_WORD0
  /*
   * we currently store the exclusive create verifier in the v_{a,m}time
   * attributes so the client can't set these at create time using EXCLUSIVE4_1
   */
  #define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
  	(NFSD_WRITEABLE_ATTRS_WORD1 & \
  	 ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
  #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
  	NFSD_WRITEABLE_ATTRS_WORD2
  
  #endif /* CONFIG_NFSD_V4 */
  
  #endif /* LINUX_NFSD_NFSD_H */
  