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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Defines for runlist handling in NTFS Linux kernel driver.
*
* Copyright (c) 2001-2005 Anton Altaparmakov
* Copyright (c) 2002 Richard Russon
* Copyright (c) 2025 LG Electronics Co., Ltd.
*/
#ifndef _LINUX_NTFS_RUNLIST_H
#define _LINUX_NTFS_RUNLIST_H
#include "volume.h"
/*
* runlist_element - in memory vcn to lcn mapping array element
* @vcn: starting vcn of the current array element
* @lcn: starting lcn of the current array element
* @length: length in clusters of the current array element
*
* The last vcn (in fact the last vcn + 1) is reached when length == 0.
*
* When lcn == -1 this means that the count vcns starting at vcn are not
* physically allocated (i.e. this is a hole / data is sparse).
*
* In memory vcn to lcn mapping structure element.
* @vcn: vcn = Starting virtual cluster number.
* @lcn: lcn = Starting logical cluster number.
* @length: Run length in clusters.
*/
struct runlist_element {
s64 vcn;
s64 lcn;
s64 length;
};
/*
* runlist - in memory vcn to lcn mapping array including a read/write lock
* @rl: pointer to an array of runlist elements
* @lock: read/write spinlock for serializing access to @rl
* @rl_hint: hint/cache pointing to the last accessed runlist element
*/
struct runlist {
struct runlist_element *rl;
struct rw_semaphore lock;
size_t count;
int rl_hint;
};
static inline void ntfs_init_runlist(struct runlist *rl)
{
rl->rl = NULL;
init_rwsem(&rl->lock);
rl->count = 0;
rl->rl_hint = -1;
}
enum {
LCN_DELALLOC = -1,
LCN_HOLE = -2,
LCN_RL_NOT_MAPPED = -3,
LCN_ENOENT = -4,
LCN_ENOMEM = -5,
LCN_EIO = -6,
LCN_EINVAL = -7,
};
struct runlist_element *ntfs_runlists_merge(struct runlist *d_runlist,
struct runlist_element *srl, size_t s_rl_count,
size_t *new_rl_count);
struct runlist_element *ntfs_mapping_pairs_decompress(const struct ntfs_volume *vol,
const struct attr_record *attr, struct runlist *old_runlist,
size_t *new_rl_count);
s64 ntfs_rl_vcn_to_lcn(const struct runlist_element *rl, const s64 vcn);
struct runlist_element *ntfs_rl_find_vcn_nolock(struct runlist_element *rl, const s64 vcn);
int ntfs_get_size_for_mapping_pairs(const struct ntfs_volume *vol,
const struct runlist_element *rl, const s64 first_vcn,
const s64 last_vcn, int max_mp_size);
int ntfs_mapping_pairs_build(const struct ntfs_volume *vol, s8 *dst,
const int dst_len, const struct runlist_element *rl,
const s64 first_vcn, const s64 last_vcn, s64 *const stop_vcn,
struct runlist_element **stop_rl, unsigned int *de_cluster_count);
int ntfs_rl_truncate_nolock(const struct ntfs_volume *vol,
struct runlist *const runlist, const s64 new_length);
int ntfs_rl_sparse(struct runlist_element *rl);
s64 ntfs_rl_get_compressed_size(struct ntfs_volume *vol, struct runlist_element *rl);
struct runlist_element *ntfs_rl_insert_range(struct runlist_element *dst_rl, int dst_cnt,
struct runlist_element *src_rl, int src_cnt, size_t *new_cnt);
struct runlist_element *ntfs_rl_punch_hole(struct runlist_element *dst_rl, int dst_cnt,
s64 start_vcn, s64 len, struct runlist_element **punch_rl,
size_t *new_rl_cnt);
struct runlist_element *ntfs_rl_collapse_range(struct runlist_element *dst_rl, int dst_cnt,
s64 start_vcn, s64 len, struct runlist_element **punch_rl,
size_t *new_rl_cnt);
struct runlist_element *ntfs_rl_realloc(struct runlist_element *rl, int old_size,
int new_size);
#endif /* _LINUX_NTFS_RUNLIST_H */
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