diff options
Diffstat (limited to 'include/linux/nfsd/export.h')
| -rw-r--r-- | include/linux/nfsd/export.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h new file mode 100644 index 000000000000..6bad4766d3d9 --- /dev/null +++ b/include/linux/nfsd/export.h @@ -0,0 +1,137 @@ +/* + * 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 */ + |