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1e9ea7e044
This reverts commit 7ffa8f3d30.
Reverts the removal of the classic read-only ntfs driver to
serve as the base for a new read-write ntfs implementation.
If we stack changes on top of the revert patch, It will significantly
reduce the diff size, making the review easier.
This revert intentionally excludes the restoration of Kconfig and
Makefile. The Kconfig and Makefile will be added back in the final patch
of this series, enabling the driver only after all features and
improvements have been applied.
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* runlist.h - Defines for runlist handling in NTFS Linux kernel driver.
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* Part of the Linux-NTFS project.
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*
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* Copyright (c) 2001-2005 Anton Altaparmakov
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* Copyright (c) 2002 Richard Russon
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*/
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#ifndef _LINUX_NTFS_RUNLIST_H
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#define _LINUX_NTFS_RUNLIST_H
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#include "types.h"
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#include "layout.h"
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#include "volume.h"
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/**
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* runlist_element - in memory vcn to lcn mapping array element
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* @vcn: starting vcn of the current array element
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* @lcn: starting lcn of the current array element
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* @length: length in clusters of the current array element
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*
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* The last vcn (in fact the last vcn + 1) is reached when length == 0.
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*
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* When lcn == -1 this means that the count vcns starting at vcn are not
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* physically allocated (i.e. this is a hole / data is sparse).
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*/
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typedef struct { /* In memory vcn to lcn mapping structure element. */
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VCN vcn; /* vcn = Starting virtual cluster number. */
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LCN lcn; /* lcn = Starting logical cluster number. */
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s64 length; /* Run length in clusters. */
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} runlist_element;
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/**
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* runlist - in memory vcn to lcn mapping array including a read/write lock
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* @rl: pointer to an array of runlist elements
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* @lock: read/write spinlock for serializing access to @rl
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*
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*/
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typedef struct {
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runlist_element *rl;
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struct rw_semaphore lock;
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} runlist;
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static inline void ntfs_init_runlist(runlist *rl)
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{
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rl->rl = NULL;
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init_rwsem(&rl->lock);
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}
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typedef enum {
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LCN_HOLE = -1, /* Keep this as highest value or die! */
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LCN_RL_NOT_MAPPED = -2,
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LCN_ENOENT = -3,
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LCN_ENOMEM = -4,
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LCN_EIO = -5,
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} LCN_SPECIAL_VALUES;
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extern runlist_element *ntfs_runlists_merge(runlist_element *drl,
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runlist_element *srl);
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extern runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
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const ATTR_RECORD *attr, runlist_element *old_rl);
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extern LCN ntfs_rl_vcn_to_lcn(const runlist_element *rl, const VCN vcn);
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#ifdef NTFS_RW
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extern runlist_element *ntfs_rl_find_vcn_nolock(runlist_element *rl,
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const VCN vcn);
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extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
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const runlist_element *rl, const VCN first_vcn,
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const VCN last_vcn);
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extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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const int dst_len, const runlist_element *rl,
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const VCN first_vcn, const VCN last_vcn, VCN *const stop_vcn);
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extern int ntfs_rl_truncate_nolock(const ntfs_volume *vol,
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runlist *const runlist, const s64 new_length);
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int ntfs_rl_punch_nolock(const ntfs_volume *vol, runlist *const runlist,
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const VCN start, const s64 length);
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#endif /* NTFS_RW */
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#endif /* _LINUX_NTFS_RUNLIST_H */
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