1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
  4 */
  5#ifndef NFSD_EXPORT_H
  6#define NFSD_EXPORT_H
  7
  8#include <linux/sunrpc/cache.h>
  9#include <uapi/linux/nfsd/export.h>
 10#include <linux/nfs4.h>
 11
 12struct knfsd_fh;
 13struct svc_fh;
 14struct svc_rqst;
 15
 16/*
 17 * FS Locations
 18 */
 19
 20#define MAX_FS_LOCATIONS	128
 21
 22struct nfsd4_fs_location {
 23	char *hosts; /* colon separated list of hosts */
 24	char *path;  /* slash separated list of path components */
 25};
 26
 27struct nfsd4_fs_locations {
 28	uint32_t locations_count;
 29	struct nfsd4_fs_location *locations;
 30/* If we're not actually serving this data ourselves (only providing a
 31 * list of replicas that do serve it) then we set "migrated": */
 32	int migrated;
 33};
 34
 35/*
 36 * We keep an array of pseudoflavors with the export, in order from most
 37 * to least preferred.  For the foreseeable future, we don't expect more
 38 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
 39 * spkm3i, and spkm3p (and using all 8 at once should be rare).
 40 */
 41#define MAX_SECINFO_LIST	8
 42#define EX_UUID_LEN		16
 43
 44struct exp_flavor_info {
 45	u32	pseudoflavor;
 46	u32	flags;
 47};
 48
 49struct svc_export {
 50	struct cache_head	h;
 51	struct auth_domain *	ex_client;
 52	int			ex_flags;
 53	struct path		ex_path;
 54	kuid_t			ex_anon_uid;
 55	kgid_t			ex_anon_gid;
 56	int			ex_fsid;
 57	unsigned char *		ex_uuid; /* 16 byte fsid */
 58	struct nfsd4_fs_locations ex_fslocs;
 59	uint32_t		ex_nflavors;
 60	struct exp_flavor_info	ex_flavors[MAX_SECINFO_LIST];
 61	u32			ex_layout_types;
 62	struct nfsd4_deviceid_map *ex_devid_map;
 63	struct cache_detail	*cd;
 64	struct rcu_head		ex_rcu;
 65};
 66
 67/* an "export key" (expkey) maps a filehandlefragement to an
 68 * svc_export for a given client.  There can be several per export,
 69 * for the different fsid types.
 70 */
 71struct svc_expkey {
 72	struct cache_head	h;
 73
 74	struct auth_domain *	ek_client;
 75	int			ek_fsidtype;
 76	u32			ek_fsid[6];
 77
 78	struct path		ek_path;
 79	struct rcu_head		ek_rcu;
 80};
 81
 82#define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))
 83#define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
 84#define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
 85
 86int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
 87__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
 88
 89/*
 90 * Function declarations
 91 */
 92int			nfsd_export_init(struct net *);
 93void			nfsd_export_shutdown(struct net *);
 94void			nfsd_export_flush(struct net *);
 95struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
 96					     struct path *);
 97struct svc_export *	rqst_exp_parent(struct svc_rqst *,
 98					struct path *);
 99struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);
100int			exp_rootfh(struct net *, struct auth_domain *,
101					char *path, struct knfsd_fh *, int maxsize);
102__be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
103__be32			nfserrno(int errno);
104
105static inline void exp_put(struct svc_export *exp)
106{
107	cache_put(&exp->h, exp->cd);
108}
109
110static inline struct svc_export *exp_get(struct svc_export *exp)
111{
112	cache_get(&exp->h);
113	return exp;
114}
115struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
116
117#endif /* NFSD_EXPORT_H */