1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* AFS fileserver XDR types 3 * 4 * Copyright (C) 2018 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8#ifndef XDR_FS_H 9#define XDR_FS_H 10 11struct afs_xdr_AFSFetchStatus { 12 __be32 if_version; 13#define AFS_FSTATUS_VERSION 1 14 __be32 type; 15 __be32 nlink; 16 __be32 size_lo; 17 __be32 data_version_lo; 18 __be32 author; 19 __be32 owner; 20 __be32 caller_access; 21 __be32 anon_access; 22 __be32 mode; 23 __be32 parent_vnode; 24 __be32 parent_unique; 25 __be32 seg_size; 26 __be32 mtime_client; 27 __be32 mtime_server; 28 __be32 group; 29 __be32 sync_counter; 30 __be32 data_version_hi; 31 __be32 lock_count; 32 __be32 size_hi; 33 __be32 abort_code; 34} __packed; 35 36#define AFS_DIR_HASHTBL_SIZE 128 37#define AFS_DIR_DIRENT_SIZE 32 38#define AFS_DIR_SLOTS_PER_BLOCK 64 39#define AFS_DIR_BLOCK_SIZE 2048 40#define AFS_DIR_BLOCKS_PER_PAGE (PAGE_SIZE / AFS_DIR_BLOCK_SIZE) 41#define AFS_DIR_MAX_SLOTS 65536 42#define AFS_DIR_BLOCKS_WITH_CTR 128 43#define AFS_DIR_MAX_BLOCKS 1023 44#define AFS_DIR_RESV_BLOCKS 1 45#define AFS_DIR_RESV_BLOCKS0 13 46 47/* 48 * Directory entry structure. 49 */ 50union afs_xdr_dirent { 51 struct { 52 u8 valid; 53 u8 unused[1]; 54 __be16 hash_next; 55 __be32 vnode; 56 __be32 unique; 57 u8 name[16]; 58 u8 overflow[4]; /* if any char of the name (inc 59 * NUL) reaches here, consume 60 * the next dirent too */ 61 } u; 62 u8 extended_name[32]; 63} __packed; 64 65/* 66 * Directory block header (one at the beginning of every 2048-byte block). 67 */ 68struct afs_xdr_dir_hdr { 69 __be16 npages; 70 __be16 magic; 71#define AFS_DIR_MAGIC htons(1234) 72 u8 reserved; 73 u8 bitmap[8]; 74 u8 pad[19]; 75} __packed; 76 77/* 78 * Directory block layout 79 */ 80union afs_xdr_dir_block { 81 struct afs_xdr_dir_hdr hdr; 82 83 struct { 84 struct afs_xdr_dir_hdr hdr; 85 u8 alloc_ctrs[AFS_DIR_MAX_BLOCKS]; 86 __be16 hashtable[AFS_DIR_HASHTBL_SIZE]; 87 } meta; 88 89 union afs_xdr_dirent dirents[AFS_DIR_SLOTS_PER_BLOCK]; 90} __packed; 91 92/* 93 * Directory layout on a linux VM page. 94 */ 95struct afs_xdr_dir_page { 96 union afs_xdr_dir_block blocks[AFS_DIR_BLOCKS_PER_PAGE]; 97}; 98 99#endif /* XDR_FS_H */ 100