af6a4e280e
Add support for using a filesystem UUID to identify and export point in the filehandle. For NFSv2, this UUID is xor-ed down to 4 or 8 bytes so that it doesn't take up too much room. For NFSv3+, we use the full 16 bytes, and possibly also a 64bit inode number for exports beneath the root of a filesystem. When generating an fsid to return in 'stat' information, use the UUID (hashed down to size) if it is available and a small 'fsid' was not specifically provided. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
/*
|
|
* 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__
|
|
|
|
/*
|
|
* 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;
|
|
};
|
|
|
|
struct svc_export {
|
|
struct cache_head h;
|
|
struct auth_domain * ex_client;
|
|
int ex_flags;
|
|
struct vfsmount * ex_mnt;
|
|
struct dentry * ex_dentry;
|
|
char * ex_path;
|
|
uid_t ex_anon_uid;
|
|
gid_t ex_anon_gid;
|
|
int ex_fsid;
|
|
unsigned char * ex_uuid; /* 16 byte fsid */
|
|
struct nfsd4_fs_locations ex_fslocs;
|
|
};
|
|
|
|
/* 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 vfsmount * ek_mnt;
|
|
struct dentry * ek_dentry;
|
|
};
|
|
|
|
#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_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);
|
|
__be32 exp_pseudoroot(struct auth_domain *, struct svc_fh *fhp, struct cache_req *creq);
|
|
__be32 nfserrno(int errno);
|
|
|
|
extern struct cache_detail svc_export_cache;
|
|
|
|
static inline void exp_put(struct svc_export *exp)
|
|
{
|
|
cache_put(&exp->h, &svc_export_cache);
|
|
}
|
|
|
|
static inline void exp_get(struct svc_export *exp)
|
|
{
|
|
cache_get(&exp->h);
|
|
}
|
|
extern struct svc_export *
|
|
exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
|
|
struct cache_req *reqp);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* NFSD_EXPORT_H */
|
|
|