cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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runlist.h (2620B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * runlist.h - Defines for runlist handling in NTFS Linux kernel driver.
      4 *	       Part of the Linux-NTFS project.
      5 *
      6 * Copyright (c) 2001-2005 Anton Altaparmakov
      7 * Copyright (c) 2002 Richard Russon
      8 */
      9
     10#ifndef _LINUX_NTFS_RUNLIST_H
     11#define _LINUX_NTFS_RUNLIST_H
     12
     13#include "types.h"
     14#include "layout.h"
     15#include "volume.h"
     16
     17/**
     18 * runlist_element - in memory vcn to lcn mapping array element
     19 * @vcn:	starting vcn of the current array element
     20 * @lcn:	starting lcn of the current array element
     21 * @length:	length in clusters of the current array element
     22 *
     23 * The last vcn (in fact the last vcn + 1) is reached when length == 0.
     24 *
     25 * When lcn == -1 this means that the count vcns starting at vcn are not
     26 * physically allocated (i.e. this is a hole / data is sparse).
     27 */
     28typedef struct {	/* In memory vcn to lcn mapping structure element. */
     29	VCN vcn;	/* vcn = Starting virtual cluster number. */
     30	LCN lcn;	/* lcn = Starting logical cluster number. */
     31	s64 length;	/* Run length in clusters. */
     32} runlist_element;
     33
     34/**
     35 * runlist - in memory vcn to lcn mapping array including a read/write lock
     36 * @rl:		pointer to an array of runlist elements
     37 * @lock:	read/write spinlock for serializing access to @rl
     38 *
     39 */
     40typedef struct {
     41	runlist_element *rl;
     42	struct rw_semaphore lock;
     43} runlist;
     44
     45static inline void ntfs_init_runlist(runlist *rl)
     46{
     47	rl->rl = NULL;
     48	init_rwsem(&rl->lock);
     49}
     50
     51typedef enum {
     52	LCN_HOLE		= -1,	/* Keep this as highest value or die! */
     53	LCN_RL_NOT_MAPPED	= -2,
     54	LCN_ENOENT		= -3,
     55	LCN_ENOMEM		= -4,
     56	LCN_EIO			= -5,
     57} LCN_SPECIAL_VALUES;
     58
     59extern runlist_element *ntfs_runlists_merge(runlist_element *drl,
     60		runlist_element *srl);
     61
     62extern runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
     63		const ATTR_RECORD *attr, runlist_element *old_rl);
     64
     65extern LCN ntfs_rl_vcn_to_lcn(const runlist_element *rl, const VCN vcn);
     66
     67#ifdef NTFS_RW
     68
     69extern runlist_element *ntfs_rl_find_vcn_nolock(runlist_element *rl,
     70		const VCN vcn);
     71
     72extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
     73		const runlist_element *rl, const VCN first_vcn,
     74		const VCN last_vcn);
     75
     76extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
     77		const int dst_len, const runlist_element *rl,
     78		const VCN first_vcn, const VCN last_vcn, VCN *const stop_vcn);
     79
     80extern int ntfs_rl_truncate_nolock(const ntfs_volume *vol,
     81		runlist *const runlist, const s64 new_length);
     82
     83int ntfs_rl_punch_nolock(const ntfs_volume *vol, runlist *const runlist,
     84		const VCN start, const s64 length);
     85
     86#endif /* NTFS_RW */
     87
     88#endif /* _LINUX_NTFS_RUNLIST_H */