/* SPDX-License-Identifier: GPL-2.0-or-later */

  /* AFS fileserver XDR types
   *
   * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)

   */
  
  #ifndef XDR_FS_H
  #define XDR_FS_H
  
  struct afs_xdr_AFSFetchStatus {
  	__be32	if_version;
  #define AFS_FSTATUS_VERSION	1
  	__be32	type;
  	__be32	nlink;
  	__be32	size_lo;
  	__be32	data_version_lo;
  	__be32	author;
  	__be32	owner;
  	__be32	caller_access;
  	__be32	anon_access;
  	__be32	mode;
  	__be32	parent_vnode;
  	__be32	parent_unique;
  	__be32	seg_size;
  	__be32	mtime_client;
  	__be32	mtime_server;
  	__be32	group;
  	__be32	sync_counter;
  	__be32	data_version_hi;
  	__be32	lock_count;
  	__be32	size_hi;
  	__be32	abort_code;
  } __packed;

  #define AFS_DIR_HASHTBL_SIZE	128
  #define AFS_DIR_DIRENT_SIZE	32
  #define AFS_DIR_SLOTS_PER_BLOCK	64
  #define AFS_DIR_BLOCK_SIZE	2048
  #define AFS_DIR_BLOCKS_PER_PAGE	(PAGE_SIZE / AFS_DIR_BLOCK_SIZE)
  #define AFS_DIR_MAX_SLOTS	65536
  #define AFS_DIR_BLOCKS_WITH_CTR	128
  #define AFS_DIR_MAX_BLOCKS	1023
  #define AFS_DIR_RESV_BLOCKS	1
  #define AFS_DIR_RESV_BLOCKS0	13
  
  /*
   * Directory entry structure.
   */

  union afs_xdr_dirent {

  	struct {

  		u8		valid;
  		u8		unused[1];

  		__be16		hash_next;
  		__be32		vnode;
  		__be32		unique;

  		u8		name[16];
  		u8		overflow[4];	/* if any char of the name (inc

  						 * NUL) reaches here, consume
  						 * the next dirent too */
  	} u;

  	u8			extended_name[32];
  } __packed;

  
  /*

   * Directory block header (one at the beginning of every 2048-byte block).

   */

  struct afs_xdr_dir_hdr {

  	__be16		npages;
  	__be16		magic;
  #define AFS_DIR_MAGIC htons(1234)

  	u8		reserved;
  	u8		bitmap[8];
  	u8		pad[19];
  } __packed;

  
  /*
   * Directory block layout
   */

  union afs_xdr_dir_block {
  	struct afs_xdr_dir_hdr		hdr;

  
  	struct {

  		struct afs_xdr_dir_hdr	hdr;
  		u8			alloc_ctrs[AFS_DIR_MAX_BLOCKS];

  		__be16			hashtable[AFS_DIR_HASHTBL_SIZE];

  	} meta;

  	union afs_xdr_dirent	dirents[AFS_DIR_SLOTS_PER_BLOCK];
  } __packed;

  
  /*
   * Directory layout on a linux VM page.
   */

  struct afs_xdr_dir_page {
  	union afs_xdr_dir_block	blocks[AFS_DIR_BLOCKS_PER_PAGE];

  };

  #endif /* XDR_FS_H */