cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

xdr_fs.h (2760B)

      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[];
     58		/* When determining the number of dirent slots needed to
     59		 * represent a directory entry, name should be assumed to be 16
     60		 * bytes, due to a now-standardised (mis)calculation, but it is
     61		 * in fact 20 bytes in size.  afs_dir_calc_slots() should be
     62		 * used for this.
     63		 *
     64		 * For names longer than (16 or) 20 bytes, extra slots should
     65		 * be annexed to this one using the extended_name format.
     66		 */
     67	} u;
     68	u8			extended_name[32];
     69} __packed;
     70
     71/*
     72 * Directory block header (one at the beginning of every 2048-byte block).
     73 */
     74struct afs_xdr_dir_hdr {
     75	__be16		npages;
     76	__be16		magic;
     77#define AFS_DIR_MAGIC htons(1234)
     78	u8		reserved;
     79	u8		bitmap[8];
     80	u8		pad[19];
     81} __packed;
     82
     83/*
     84 * Directory block layout
     85 */
     86union afs_xdr_dir_block {
     87	struct afs_xdr_dir_hdr		hdr;
     88
     89	struct {
     90		struct afs_xdr_dir_hdr	hdr;
     91		u8			alloc_ctrs[AFS_DIR_MAX_BLOCKS];
     92		__be16			hashtable[AFS_DIR_HASHTBL_SIZE];
     93	} meta;
     94
     95	union afs_xdr_dirent	dirents[AFS_DIR_SLOTS_PER_BLOCK];
     96} __packed;
     97
     98/*
     99 * Directory layout on a linux VM page.
    100 */
    101struct afs_xdr_dir_page {
    102	union afs_xdr_dir_block	blocks[AFS_DIR_BLOCKS_PER_PAGE];
    103};
    104
    105/*
    106 * Calculate the number of dirent slots required for any given name length.
    107 * The calculation is made assuming the part of the name in the first slot is
    108 * 16 bytes, rather than 20, but this miscalculation is now standardised.
    109 */
    110static inline unsigned int afs_dir_calc_slots(size_t name_len)
    111{
    112	name_len++; /* NUL-terminated */
    113	return 1 + ((name_len + 15) / AFS_DIR_DIRENT_SIZE);
    114}
    115
    116#endif /* XDR_FS_H */