Eric Lee / smarc-fsl-linux-kernel

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81f7e3824   Eric Lee   Initial Release, ... 
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  /* SPDX-License-Identifier: GPL-2.0 */
  /*
   * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   */
  #ifndef NFSD_EXPORT_H
  #define NFSD_EXPORT_H
  
  #include <linux/sunrpc/cache.h>
  #include <uapi/linux/nfsd/export.h>
  #include <linux/nfs4.h>
  
  struct knfsd_fh;
  struct svc_fh;
  struct svc_rqst;
  
  /*
   * 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;
  };
  
  /*
   * We keep an array of pseudoflavors with the export, in order from most
   * to least preferred.  For the foreseeable future, we don't expect more
   * 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
  #define EX_UUID_LEN		16
  
  struct exp_flavor_info {
  	u32	pseudoflavor;
  	u32	flags;
  };
  
  struct svc_export {
  	struct cache_head	h;
  	struct auth_domain *	ex_client;
  	int			ex_flags;
  	struct path		ex_path;
  	kuid_t			ex_anon_uid;
  	kgid_t			ex_anon_gid;
  	int			ex_fsid;
  	unsigned char *		ex_uuid; /* 16 byte fsid */
  	struct nfsd4_fs_locations ex_fslocs;
  	uint32_t		ex_nflavors;
  	struct exp_flavor_info	ex_flavors[MAX_SECINFO_LIST];
  	u32			ex_layout_types;
  	struct nfsd4_deviceid_map *ex_devid_map;
  	struct cache_detail	*cd;
  };
  
  /* an "export key" (expkey) maps a filehandlefragement to an
   * svc_export for a given client.  There can be several per export,
   * for the different fsid types.
   */
  struct svc_expkey {
  	struct cache_head	h;
  
  	struct auth_domain *	ek_client;
  	int			ek_fsidtype;
  	u32			ek_fsid[6];
  
  	struct path		ek_path;
  };
  
  #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)
  
  int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
  __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
  
  /*
   * Function declarations
   */
  int			nfsd_export_init(struct net *);
  void			nfsd_export_shutdown(struct net *);
  void			nfsd_export_flush(struct net *);
  struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
  					     struct path *);
  struct svc_export *	rqst_exp_parent(struct svc_rqst *,
  					struct path *);
  struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);
  int			exp_rootfh(struct net *, struct auth_domain *,
  					char *path, struct knfsd_fh *, int maxsize);
  __be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
  __be32			nfserrno(int errno);
  
  static inline void exp_put(struct svc_export *exp)
  {
  	cache_put(&exp->h, exp->cd);
  }
  
  static inline struct svc_export *exp_get(struct svc_export *exp)
  {
  	cache_get(&exp->h);
  	return exp;
  }
  struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
  
  #endif /* NFSD_EXPORT_H */