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/
usr/
include/
linux/
nfsd/
- drwxr-xr-x
|
Viewing file:  nfsfh.h (4.15 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/*
* include/linux/nfsd/nfsfh.h
*
* This file describes the layout of the file handles as passed
* over the wire.
*
* Earlier versions of knfsd used to sign file handles using keyed MD5
* or SHA. I've removed this code, because it doesn't give you more
* security than blocking external access to port 2049 on your firewall.
*
* Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
*/
#ifndef _LINUX_NFSD_FH_H
#define _LINUX_NFSD_FH_H
# include <linux/types.h>
#include <linux/nfsd/const.h>
/*
* This is the old "dentry style" Linux NFSv2 file handle.
*
* The xino and xdev fields are currently used to transport the
* ino/dev of the exported inode.
*/
struct nfs_fhbase_old {
__u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */
__u32 fb_ino; /* our inode number */
__u32 fb_dirino; /* dir inode number, 0 for directories */
__u32 fb_dev; /* our device */
__u32 fb_xdev;
__u32 fb_xino;
__u32 fb_generation;
};
/*
* This is the new flexible, extensible style NFSv2/v3 file handle.
* by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
*
* The file handle starts with a sequence of four-byte words.
* The first word contains a version number (1) and three descriptor bytes
* that tell how the remaining 3 variable length fields should be handled.
* These three bytes are auth_type, fsid_type and fileid_type.
*
* All four-byte values are in host-byte-order.
*
* The auth_type field specifies how the filehandle can be authenticated
* This might allow a file to be confirmed to be in a writable part of a
* filetree without checking the path from it up to the root.
* Current values:
* 0 - No authentication. fb_auth is 0 bytes long
* Possible future values:
* 1 - 4 bytes taken from MD5 hash of the remainer of the file handle
* prefixed by a secret and with the important export flags.
*
* The fsid_type identifies how the filesystem (or export point) is
* encoded.
* Current values:
* 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
* NOTE: we cannot use the kdev_t device id value, because kdev_t.h
* says we mustn't. We must break it up and reassemble.
* 1 - 4 byte user specified identifier
* 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
* 3 - 4 byte device id, encoded for user-space, 4 byte inode number
* 4 - 4 byte inode number and 4 byte uuid
* 5 - 8 byte uuid
* 6 - 16 byte uuid
* 7 - 8 byte inode number and 16 byte uuid
*
* The fileid_type identified how the file within the filesystem is encoded.
* This is (will be) passed to, and set by, the underlying filesystem if it supports
* filehandle operations. The filesystem must not use the value '0' or '0xff' and may
* only use the values 1 and 2 as defined below:
* Current values:
* 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes.
* 1 - 32bit inode number, 32 bit generation number.
* 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
*
*/
struct nfs_fhbase_new {
__u8 fb_version; /* == 1, even => nfs_fhbase_old */
__u8 fb_auth_type;
__u8 fb_fsid_type;
__u8 fb_fileid_type;
__u32 fb_auth[1];
/* __u32 fb_fsid[0]; floating */
/* __u32 fb_fileid[0]; floating */
};
struct knfsd_fh {
unsigned int fh_size; /* significant for NFSv3.
* Points to the current size while building
* a new file handle
*/
union {
struct nfs_fhbase_old fh_old;
__u32 fh_pad[NFS4_FHSIZE/4];
struct nfs_fhbase_new fh_new;
} fh_base;
};
#define ofh_dcookie fh_base.fh_old.fb_dcookie
#define ofh_ino fh_base.fh_old.fb_ino
#define ofh_dirino fh_base.fh_old.fb_dirino
#define ofh_dev fh_base.fh_old.fb_dev
#define ofh_xdev fh_base.fh_old.fb_xdev
#define ofh_xino fh_base.fh_old.fb_xino
#define ofh_generation fh_base.fh_old.fb_generation
#define fh_version fh_base.fh_new.fb_version
#define fh_fsid_type fh_base.fh_new.fb_fsid_type
#define fh_auth_type fh_base.fh_new.fb_auth_type
#define fh_fileid_type fh_base.fh_new.fb_fileid_type
#define fh_auth fh_base.fh_new.fb_auth
#define fh_fsid fh_base.fh_new.fb_auth
#endif /* _LINUX_NFSD_FH_H */
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