169 lines
5.5 KiB
C
169 lines
5.5 KiB
C
/*
|
|
* 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>
|
|
#ifdef __KERNEL__
|
|
# include <linux/sunrpc/svc.h>
|
|
#endif
|
|
#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 upto 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
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
static inline __u32 ino_t_to_u32(ino_t ino)
|
|
{
|
|
return (__u32) ino;
|
|
}
|
|
|
|
static inline ino_t u32_to_ino_t(__u32 uino)
|
|
{
|
|
return (ino_t) uino;
|
|
}
|
|
|
|
/*
|
|
* This is the internal representation of an NFS handle used in knfsd.
|
|
* pre_mtime/post_version will be used to support wcc_attr's in NFSv3.
|
|
*/
|
|
typedef struct svc_fh {
|
|
struct knfsd_fh fh_handle; /* FH data */
|
|
struct dentry * fh_dentry; /* validated dentry */
|
|
struct svc_export * fh_export; /* export pointer */
|
|
int fh_maxsize; /* max size for fh_handle */
|
|
|
|
unsigned char fh_locked; /* inode locked by us */
|
|
|
|
#ifdef CONFIG_NFSD_V3
|
|
unsigned char fh_post_saved; /* post-op attrs saved */
|
|
unsigned char fh_pre_saved; /* pre-op attrs saved */
|
|
|
|
/* Pre-op attributes saved during fh_lock */
|
|
__u64 fh_pre_size; /* size before operation */
|
|
struct timespec fh_pre_mtime; /* mtime before oper */
|
|
struct timespec fh_pre_ctime; /* ctime before oper */
|
|
/*
|
|
* pre-op nfsv4 change attr: note must check IS_I_VERSION(inode)
|
|
* to find out if it is valid.
|
|
*/
|
|
u64 fh_pre_change;
|
|
|
|
/* Post-op attributes saved in fh_unlock */
|
|
struct kstat fh_post_attr; /* full attrs after operation */
|
|
u64 fh_post_change; /* nfsv4 change; see above */
|
|
#endif /* CONFIG_NFSD_V3 */
|
|
|
|
} svc_fh;
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
|
|
#endif /* _LINUX_NFSD_FH_H */
|