release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/linux/nfsd/nfsfh.h

   1 /*
   2  * include/linux/nfsd/nfsfh.h
   3  *
   4  * This file describes the layout of the file handles as passed
   5  * over the wire.
   6  *
   7  * Earlier versions of knfsd used to sign file handles using keyed MD5
   8  * or SHA. I've removed this code, because it doesn't give you more
   9  * security than blocking external access to port 2049 on your firewall.
  10  *
  11  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
  12  */
  13
  14 #ifndef _LINUX_NFSD_FH_H
  15 #define _LINUX_NFSD_FH_H
  16
  17 # include <linux/types.h>
  18 #include <linux/nfsd/const.h>
  19
  20 /*
  21  * This is the old "dentry style" Linux NFSv2 file handle.
  22  *
  23  * The xino and xdev fields are currently used to transport the
  24  * ino/dev of the exported inode.
  25  */
  26 struct nfs_fhbase_old {
  27         __u32           fb_dcookie;     /* dentry cookie - always 0xfeebbaca */
  28         __u32           fb_ino;         /* our inode number */
  29         __u32           fb_dirino;      /* dir inode number, 0 for directories */
  30         __u32           fb_dev;         /* our device */
  31         __u32           fb_xdev;
  32         __u32           fb_xino;
  33         __u32           fb_generation;
  34 };
  35
  36 /*
  37  * This is the new flexible, extensible style NFSv2/v3 file handle.
  38  * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000
  39  *
  40  * The file handle starts with a sequence of four-byte words.
  41  * The first word contains a version number (1) and three descriptor bytes
  42  * that tell how the remaining 3 variable length fields should be handled.
  43  * These three bytes are auth_type, fsid_type and fileid_type.
  44  *
  45  * All four-byte values are in host-byte-order.
  46  *
  47  * The auth_type field specifies how the filehandle can be authenticated
  48  * This might allow a file to be confirmed to be in a writable part of a
  49  * filetree without checking the path from it upto the root.
  50  * Current values:
  51  *     0  - No authentication.  fb_auth is 0 bytes long
  52  * Possible future values:
  53  *     1  - 4 bytes taken from MD5 hash of the remainer of the file handle
  54  *          prefixed by a secret and with the important export flags.
  55  *
  56  * The fsid_type identifies how the filesystem (or export point) is
  57  *    encoded.
  58  *  Current values:
  59  *     0  - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number
  60  *        NOTE: we cannot use the kdev_t device id value, because kdev_t.h
  61  *              says we mustn't.  We must break it up and reassemble.
  62  *     1  - 4 byte user specified identifier
  63  *     2  - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED
  64  *     3  - 4 byte device id, encoded for user-space, 4 byte inode number
  65  *     4  - 4 byte inode number and 4 byte uuid
  66  *     5  - 8 byte uuid
  67  *     6  - 16 byte uuid
  68  *     7  - 8 byte inode number and 16 byte uuid
  69  *
  70  * The fileid_type identified how the file within the filesystem is encoded.
  71  * This is (will be) passed to, and set by, the underlying filesystem if it supports
  72  * filehandle operations.  The filesystem must not use the value '0' or '0xff' and may
  73  * only use the values 1 and 2 as defined below:
  74  *  Current values:
  75  *    0   - The root, or export point, of the filesystem.  fb_fileid is 0 bytes.
  76  *    1   - 32bit inode number, 32 bit generation number.
  77  *    2   - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number.
  78  *
  79  */
  80 struct nfs_fhbase_new {
  81         __u8            fb_version;     /* == 1, even => nfs_fhbase_old */
  82         __u8            fb_auth_type;
  83         __u8            fb_fsid_type;
  84         __u8            fb_fileid_type;
  85         __u32           fb_auth[1];
  86 /*      __u32           fb_fsid[0]; floating */
  87 /*      __u32           fb_fileid[0]; floating */
  88 };
  89
  90 struct knfsd_fh {
  91         unsigned int    fh_size;        /* significant for NFSv3.
  92                                          * Points to the current size while building
  93                                          * a new file handle
  94                                          */
  95         union {
  96                 struct nfs_fhbase_old   fh_old;
  97                 __u32                   fh_pad[NFS4_FHSIZE/4];
  98                 struct nfs_fhbase_new   fh_new;
  99         } fh_base;
 100 };
 101
 102 #define ofh_dcookie             fh_base.fh_old.fb_dcookie
 103 #define ofh_ino                 fh_base.fh_old.fb_ino
 104 #define ofh_dirino              fh_base.fh_old.fb_dirino
 105 #define ofh_dev                 fh_base.fh_old.fb_dev
 106 #define ofh_xdev                fh_base.fh_old.fb_xdev
 107 #define ofh_xino                fh_base.fh_old.fb_xino
 108 #define ofh_generation          fh_base.fh_old.fb_generation
 109
 110 #define fh_version              fh_base.fh_new.fb_version
 111 #define fh_fsid_type            fh_base.fh_new.fb_fsid_type
 112 #define fh_auth_type            fh_base.fh_new.fb_auth_type
 113 #define fh_fileid_type          fh_base.fh_new.fb_fileid_type
 114 #define fh_auth                 fh_base.fh_new.fb_auth
 115 #define fh_fsid                 fh_base.fh_new.fb_auth
 116
 117
 118
 119 #endif /* _LINUX_NFSD_FH_H */