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TOMOYO Linux Cross Reference
Linux/fs/afs/xdr_fs.h

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  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 */
104 

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