/*

 * 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 <asm/types.h>

#ifdef __KERNEL__

# include <linux/types.h>

# include <linux/in.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 */

#define NFSEXP_FSID		0x2000

#define	NFSEXP_CROSSMOUNT	0x4000

#define	NFSEXP_NOACL		0x8000	/* reserved for possible ACL related use */

#define NFSEXP_ALLFLAGS		0xFE3F

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

#define NFSEXP_SECINFO_FLAGS	(NFSEXP_READONLY | NFSEXP_ROOTSQUASH \

					| NFSEXP_ALLSQUASH)

#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 forseeable 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;

	char			*ex_pathname;

	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_SECURE(exp)		(!((exp)->ex_flags & NFSEXP_INSECURE_PORT))

#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);

void			exp_readlock(void);

void			exp_readunlock(void);

struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,

					     struct vfsmount *,

					     struct dentry *);

struct svc_export *	rqst_exp_parent(struct svc_rqst *,

					struct vfsmount *mnt,

					struct dentry *dentry);

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 */