fs/afs/xdr_fs.h

   1 /* AFS fileserver XDR types
   2  *
   3  * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public Licence
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the Licence, or (at your option) any later version.
  10  */
  11
  12 #ifndef XDR_FS_H
  13 #define XDR_FS_H
  14
  15 struct afs_xdr_AFSFetchStatus {
  16         __be32  if_version;
  17 #define AFS_FSTATUS_VERSION     1
  18         __be32  type;
  19         __be32  nlink;
  20         __be32  size_lo;
  21         __be32  data_version_lo;
  22         __be32  author;
  23         __be32  owner;
  24         __be32  caller_access;
  25         __be32  anon_access;
  26         __be32  mode;
  27         __be32  parent_vnode;
  28         __be32  parent_unique;
  29         __be32  seg_size;
  30         __be32  mtime_client;
  31         __be32  mtime_server;
  32         __be32  group;
  33         __be32  sync_counter;
  34         __be32  data_version_hi;
  35         __be32  lock_count;
  36         __be32  size_hi;
  37         __be32  abort_code;
  38 } __packed;
  39
  40 #define AFS_DIR_HASHTBL_SIZE    128
  41 #define AFS_DIR_DIRENT_SIZE     32
  42 #define AFS_DIR_SLOTS_PER_BLOCK 64
  43 #define AFS_DIR_BLOCK_SIZE      2048
  44 #define AFS_DIR_BLOCKS_PER_PAGE (PAGE_SIZE / AFS_DIR_BLOCK_SIZE)
  45 #define AFS_DIR_MAX_SLOTS       65536
  46 #define AFS_DIR_BLOCKS_WITH_CTR 128
  47 #define AFS_DIR_MAX_BLOCKS      1023
  48 #define AFS_DIR_RESV_BLOCKS     1
  49 #define AFS_DIR_RESV_BLOCKS0    13
  50
  51 /*
  52  * Directory entry structure.
  53  */
  54 union afs_xdr_dirent {
  55         struct {
  56                 u8              valid;
  57                 u8              unused[1];
  58                 __be16          hash_next;
  59                 __be32          vnode;
  60                 __be32          unique;
  61                 u8              name[16];
  62                 u8              overflow[4];    /* if any char of the name (inc
  63                                                  * NUL) reaches here, consume
  64                                                  * the next dirent too */
  65         } u;
  66         u8                      extended_name[32];
  67 } __packed;
  68
  69 /*
  70  * Directory block header (one at the beginning of every 2048-byte block).
  71  */
  72 struct afs_xdr_dir_hdr {
  73         __be16          npages;
  74         __be16          magic;
  75 #define AFS_DIR_MAGIC htons(1234)
  76         u8              reserved;
  77         u8              bitmap[8];
  78         u8              pad[19];
  79 } __packed;
  80
  81 /*
  82  * Directory block layout
  83  */
  84 union afs_xdr_dir_block {
  85         struct afs_xdr_dir_hdr          hdr;
  86
  87         struct {
  88                 struct afs_xdr_dir_hdr  hdr;
  89                 u8                      alloc_ctrs[AFS_DIR_MAX_BLOCKS];
  90                 __be16                  hashtable[AFS_DIR_HASHTBL_SIZE];
  91         } meta;
  92
  93         union afs_xdr_dirent    dirents[AFS_DIR_SLOTS_PER_BLOCK];
  94 } __packed;
  95
  96 /*
  97  * Directory layout on a linux VM page.
  98  */
  99 struct afs_xdr_dir_page {
 100         union afs_xdr_dir_block blocks[AFS_DIR_BLOCKS_PER_PAGE];
 101 };
 102
 103 #endif /* XDR_FS_H */