138 строки
3.7 KiB
C
138 строки
3.7 KiB
C
/*
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* include/linux/nfsd/export.h
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*
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* Public declarations for NFS exports. The definitions for the
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* syscall interface are in nfsctl.h
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*
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* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef NFSD_EXPORT_H
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#define NFSD_EXPORT_H
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#include <asm/types.h>
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#ifdef __KERNEL__
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# include <linux/types.h>
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# include <linux/in.h>
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#endif
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/*
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* Important limits for the exports stuff.
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*/
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#define NFSCLNT_IDMAX 1024
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#define NFSCLNT_ADDRMAX 16
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#define NFSCLNT_KEYMAX 32
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/*
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* Export flags.
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*/
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#define NFSEXP_READONLY 0x0001
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#define NFSEXP_INSECURE_PORT 0x0002
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#define NFSEXP_ROOTSQUASH 0x0004
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#define NFSEXP_ALLSQUASH 0x0008
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#define NFSEXP_ASYNC 0x0010
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#define NFSEXP_GATHERED_WRITES 0x0020
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/* 40 80 100 currently unused */
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#define NFSEXP_NOHIDE 0x0200
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#define NFSEXP_NOSUBTREECHECK 0x0400
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#define NFSEXP_NOAUTHNLM 0x0800 /* Don't authenticate NLM requests - just trust */
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#define NFSEXP_MSNFS 0x1000 /* do silly things that MS clients expect */
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#define NFSEXP_FSID 0x2000
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#define NFSEXP_CROSSMOUNT 0x4000
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#define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
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#define NFSEXP_ALLFLAGS 0xFE3F
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#ifdef __KERNEL__
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struct svc_export {
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struct cache_head h;
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struct auth_domain * ex_client;
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int ex_flags;
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struct vfsmount * ex_mnt;
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struct dentry * ex_dentry;
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uid_t ex_anon_uid;
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gid_t ex_anon_gid;
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int ex_fsid;
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};
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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 two per export, one
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* for type 0 (dev/ino), one for type 1 (fsid)
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*/
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struct svc_expkey {
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struct cache_head h;
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struct auth_domain * ek_client;
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int ek_fsidtype;
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u32 ek_fsid[3];
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struct svc_export * ek_export;
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};
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#define EX_SECURE(exp) (!((exp)->ex_flags & NFSEXP_INSECURE_PORT))
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#define EX_ISSYNC(exp) (!((exp)->ex_flags & NFSEXP_ASYNC))
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#define EX_RDONLY(exp) ((exp)->ex_flags & NFSEXP_READONLY)
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#define EX_NOHIDE(exp) ((exp)->ex_flags & NFSEXP_NOHIDE)
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#define EX_WGATHER(exp) ((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
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/*
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* Function declarations
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*/
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void nfsd_export_init(void);
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void nfsd_export_shutdown(void);
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void nfsd_export_flush(void);
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void exp_readlock(void);
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void exp_readunlock(void);
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struct svc_expkey * exp_find_key(struct auth_domain *clp,
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int fsid_type, u32 *fsidv,
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struct cache_req *reqp);
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struct svc_export * exp_get_by_name(struct auth_domain *clp,
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struct vfsmount *mnt,
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struct dentry *dentry,
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struct cache_req *reqp);
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struct svc_export * exp_parent(struct auth_domain *clp,
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struct vfsmount *mnt,
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struct dentry *dentry,
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struct cache_req *reqp);
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int exp_rootfh(struct auth_domain *,
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char *path, struct knfsd_fh *, int maxsize);
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int exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
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int nfserrno(int errno);
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extern void expkey_put(struct cache_head *item, struct cache_detail *cd);
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extern void svc_export_put(struct cache_head *item, struct cache_detail *cd);
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extern struct cache_detail svc_export_cache, svc_expkey_cache;
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static inline void exp_put(struct svc_export *exp)
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{
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svc_export_put(&exp->h, &svc_export_cache);
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}
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static inline void exp_get(struct svc_export *exp)
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{
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cache_get(&exp->h);
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}
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static inline struct svc_export *
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exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
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struct cache_req *reqp)
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{
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struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
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if (ek && !IS_ERR(ek)) {
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struct svc_export *exp = ek->ek_export;
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int err;
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exp_get(exp);
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expkey_put(&ek->h, &svc_expkey_cache);
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if ((err = cache_check(&svc_export_cache, &exp->h, reqp)))
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exp = ERR_PTR(err);
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return exp;
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} else
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return ERR_PTR(PTR_ERR(ek));
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}
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#endif /* __KERNEL__ */
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#endif /* NFSD_EXPORT_H */
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