/*
   * include/linux/nfsd/export.h
   * 
   * Public declarations for NFS exports. The definitions for the
   * syscall interface are in nfsctl.h
   *
   * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   */
  
  #ifndef NFSD_EXPORT_H
  #define NFSD_EXPORT_H

  # include <linux/types.h>

  #ifdef __KERNEL__

  # include <linux/nfsd/nfsfh.h>

  #endif
  
  /*
   * Important limits for the exports stuff.
   */
  #define NFSCLNT_IDMAX		1024
  #define NFSCLNT_ADDRMAX		16
  #define NFSCLNT_KEYMAX		32
  
  /*
   * Export flags.
   */
  #define NFSEXP_READONLY		0x0001
  #define NFSEXP_INSECURE_PORT	0x0002
  #define NFSEXP_ROOTSQUASH	0x0004
  #define NFSEXP_ALLSQUASH	0x0008
  #define NFSEXP_ASYNC		0x0010
  #define NFSEXP_GATHERED_WRITES	0x0020
  /* 40 80 100 currently unused */
  #define NFSEXP_NOHIDE		0x0200
  #define NFSEXP_NOSUBTREECHECK	0x0400
  #define	NFSEXP_NOAUTHNLM	0x0800		/* Don't authenticate NLM requests - just trust */

  #define NFSEXP_MSNFS		0x1000	/* do silly things that MS clients expect; no longer supported */

  #define NFSEXP_FSID		0x2000
  #define	NFSEXP_CROSSMOUNT	0x4000
  #define	NFSEXP_NOACL		0x8000	/* reserved for possible ACL related use */

  /*
   * The NFSEXP_V4ROOT flag causes the kernel to give access only to NFSv4
   * clients, and only to the single directory that is the root of the
   * export; further lookup and readdir operations are treated as if every
   * subdirectory was a mountpoint, and ignored if they are not themselves
   * exported.  This is used by nfsd and mountd to construct the NFSv4
   * pseudofilesystem, which provides access only to paths leading to each
   * exported filesystem.
   */
  #define	NFSEXP_V4ROOT		0x10000

  /* All flags that we claim to support.  (Note we don't support NOACL.) */

  #define NFSEXP_ALLFLAGS		0x17E3F

  /* The flags that may vary depending on security flavor: */

  #define NFSEXP_SECINFO_FLAGS	(NFSEXP_READONLY | NFSEXP_ROOTSQUASH \

  					| NFSEXP_ALLSQUASH \
  					| NFSEXP_INSECURE_PORT)

  
  #ifdef __KERNEL__

  /*
   * FS Locations
   */
  
  #define MAX_FS_LOCATIONS	128
  
  struct nfsd4_fs_location {
  	char *hosts; /* colon separated list of hosts */
  	char *path;  /* slash separated list of path components */
  };
  
  struct nfsd4_fs_locations {
  	uint32_t locations_count;
  	struct nfsd4_fs_location *locations;
  /* If we're not actually serving this data ourselves (only providing a
   * list of replicas that do serve it) then we set "migrated": */
  	int migrated;
  };

  /*
   * We keep an array of pseudoflavors with the export, in order from most

   * to least preferred.  For the foreseeable future, we don't expect more

   * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
   * spkm3i, and spkm3p (and using all 8 at once should be rare).
   */
  #define MAX_SECINFO_LIST	8
  
  struct exp_flavor_info {
  	u32	pseudoflavor;
  	u32	flags;
  };

  struct svc_export {
  	struct cache_head	h;
  	struct auth_domain *	ex_client;
  	int			ex_flags;

  	struct path		ex_path;

  	uid_t			ex_anon_uid;
  	gid_t			ex_anon_gid;
  	int			ex_fsid;

  	unsigned char *		ex_uuid; /* 16 byte fsid */

  	struct nfsd4_fs_locations ex_fslocs;

  	int			ex_nflavors;
  	struct exp_flavor_info	ex_flavors[MAX_SECINFO_LIST];

  };
  
  /* an "export key" (expkey) maps a filehandlefragement to an

   * svc_export for a given client.  There can be several per export,
   * for the different fsid types.

   */
  struct svc_expkey {
  	struct cache_head	h;
  
  	struct auth_domain *	ek_client;
  	int			ek_fsidtype;

  	u32			ek_fsid[6];

  	struct path		ek_path;

  };

  #define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))

  #define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
  #define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)

  int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);

  __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);

  
  /*
   * Function declarations
   */

  int			nfsd_export_init(void);

  void			nfsd_export_shutdown(void);
  void			nfsd_export_flush(void);

  struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,

  					     struct path *);

  struct svc_export *	rqst_exp_parent(struct svc_rqst *,

  					struct path *);

  struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);

  int			exp_rootfh(struct auth_domain *, 
  					char *path, struct knfsd_fh *, int maxsize);

  __be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);

  __be32			nfserrno(int errno);

  extern struct cache_detail svc_export_cache;

  
  static inline void exp_put(struct svc_export *exp)
  {

  	cache_put(&exp->h, &svc_export_cache);

  }
  
  static inline void exp_get(struct svc_export *exp)
  {
  	cache_get(&exp->h);
  }

  struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);

  
  #endif /* __KERNEL__ */
  
  #endif /* NFSD_EXPORT_H */