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/*
* 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
#ifdef __KERNEL__
struct svc_export {
struct cache_head h;
struct auth_domain * ex_client;
int ex_flags;
struct vfsmount * ex_mnt;
struct dentry * ex_dentry;
uid_t ex_anon_uid;
gid_t ex_anon_gid;
int ex_fsid;
};
/* an "export key" (expkey) maps a filehandlefragement to an
* svc_export for a given client. There can be two per export, one
* for type 0 (dev/ino), one for type 1 (fsid)
*/
struct svc_expkey {
struct cache_head h;
struct auth_domain * ek_client;
int ek_fsidtype;
u32 ek_fsid[3];
struct svc_export * ek_export;
};
#define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
#define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
#define EX_RDONLY(exp) ((exp)->ex_flags & NFSEXP_READONLY)
#define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
#define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
/*
* Function declarations
*/
void nfsd_export_init(void);
void nfsd_export_shutdown(void);
void nfsd_export_flush(void);
void exp_readlock(void);
void exp_readunlock(void);
struct svc_expkey * exp_find_key(struct auth_domain *clp,
int fsid_type, u32 *fsidv,
struct cache_req *reqp);
struct svc_export * exp_get_by_name(struct auth_domain *clp,
struct vfsmount *mnt,
struct dentry *dentry,
struct cache_req *reqp);
struct svc_export * exp_parent(struct auth_domain *clp,
struct vfsmount *mnt,
struct dentry *dentry,
struct cache_req *reqp);
int exp_rootfh(struct auth_domain *,
char *path, struct knfsd_fh *, int maxsize);
int exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
int nfserrno(int errno);
extern void expkey_put(struct cache_head *item, struct cache_detail *cd);
extern void svc_export_put(struct cache_head *item, struct cache_detail *cd);
extern struct cache_detail svc_export_cache, svc_expkey_cache;
static inline void exp_put(struct svc_export *exp)
{
svc_export_put(&exp->h, &svc_export_cache);
}
static inline void exp_get(struct svc_export *exp)
{
cache_get(&exp->h);
}
static inline struct svc_export *
exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
struct cache_req *reqp)
{
struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
if (ek && !IS_ERR(ek)) {
struct svc_export *exp = ek->ek_export;
int err;
exp_get(exp);
expkey_put(&ek->h, &svc_expkey_cache);
if ((err = cache_check(&svc_export_cache, &exp->h, reqp)))
exp = ERR_PTR(err);
return exp;
} else
return ERR_PTR(PTR_ERR(ek));
}
#endif /* __KERNEL__ */
#endif /* NFSD_EXPORT_H */
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