export.h 3.0 KB
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/*
 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
 */
#ifndef NFSD_EXPORT_H
#define NFSD_EXPORT_H

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#include <linux/sunrpc/cache.h>
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#include <uapi/linux/nfsd/export.h>
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#include <linux/nfs4.h>
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struct knfsd_fh;
struct svc_fh;
struct svc_rqst;

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/*
 * 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;
};

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/*
 * We keep an array of pseudoflavors with the export, in order from most
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 * to least preferred.  For the foreseeable future, we don't expect more
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 * 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
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#define EX_UUID_LEN		16
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struct exp_flavor_info {
	u32	pseudoflavor;
	u32	flags;
};

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struct svc_export {
	struct cache_head	h;
	struct auth_domain *	ex_client;
	int			ex_flags;
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	struct path		ex_path;
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	kuid_t			ex_anon_uid;
	kgid_t			ex_anon_gid;
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	int			ex_fsid;
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	unsigned char *		ex_uuid; /* 16 byte fsid */
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	struct nfsd4_fs_locations ex_fslocs;
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	uint32_t		ex_nflavors;
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	struct exp_flavor_info	ex_flavors[MAX_SECINFO_LIST];
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	u32			ex_layout_types;
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	struct nfsd4_deviceid_map *ex_devid_map;
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	struct cache_detail	*cd;
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};

/* an "export key" (expkey) maps a filehandlefragement to an
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 * svc_export for a given client.  There can be several per export,
 * for the different fsid types.
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 */
struct svc_expkey {
	struct cache_head	h;

	struct auth_domain *	ek_client;
	int			ek_fsidtype;
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	u32			ek_fsid[6];
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	struct path		ek_path;
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};

#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)

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int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
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__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
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/*
 * Function declarations
 */
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int			nfsd_export_init(struct net *);
void			nfsd_export_shutdown(struct net *);
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void			nfsd_export_flush(struct net *);
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struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
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					     struct path *);
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struct svc_export *	rqst_exp_parent(struct svc_rqst *,
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					struct path *);
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struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);
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int			exp_rootfh(struct net *, struct auth_domain *,
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					char *path, struct knfsd_fh *, int maxsize);
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__be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
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__be32			nfserrno(int errno);
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static inline void exp_put(struct svc_export *exp)
{
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	cache_put(&exp->h, exp->cd);
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}

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static inline struct svc_export *exp_get(struct svc_export *exp)
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{
	cache_get(&exp->h);
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	return exp;
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}
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struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
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#endif /* NFSD_EXPORT_H */