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4079605199
Update the NTFS filesystem driver's in-memory and on-disk structures:
- Introduce the infrastructure and initial support for reparse
points and EA attribute.
- Refactor the core ntfs_inode and ntfs_volume structures to support
new features such as iomap.
- Remove the unnecessary types.h and endian.h headers.
- Reorganize the comments in headers for better readability, including
fixing warnings from checkpatch.pl.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Defines for runlist handling in NTFS Linux kernel driver.
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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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* Copyright (c) 2025 LG Electronics Co., Ltd.
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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 "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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* In memory vcn to lcn mapping structure element.
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* @vcn: vcn = Starting virtual cluster number.
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* @lcn: lcn = Starting logical cluster number.
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* @length: Run length in clusters.
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*/
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struct runlist_element {
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s64 vcn;
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s64 lcn;
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s64 length;
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};
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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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* @rl_hint: hint/cache pointing to the last accessed runlist element
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*/
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struct runlist {
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struct runlist_element *rl;
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struct rw_semaphore lock;
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size_t count;
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int rl_hint;
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};
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static inline void ntfs_init_runlist(struct 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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rl->count = 0;
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rl->rl_hint = -1;
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}
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enum {
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LCN_DELALLOC = -1,
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LCN_HOLE = -2,
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LCN_RL_NOT_MAPPED = -3,
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LCN_ENOENT = -4,
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LCN_ENOMEM = -5,
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LCN_EIO = -6,
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LCN_EINVAL = -7,
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};
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struct runlist_element *ntfs_runlists_merge(struct runlist *d_runlist,
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struct runlist_element *srl, size_t s_rl_count,
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size_t *new_rl_count);
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struct runlist_element *ntfs_mapping_pairs_decompress(const struct ntfs_volume *vol,
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const struct attr_record *attr, struct runlist *old_runlist,
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size_t *new_rl_count);
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s64 ntfs_rl_vcn_to_lcn(const struct runlist_element *rl, const s64 vcn);
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struct runlist_element *ntfs_rl_find_vcn_nolock(struct runlist_element *rl, const s64 vcn);
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int ntfs_get_size_for_mapping_pairs(const struct ntfs_volume *vol,
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const struct runlist_element *rl, const s64 first_vcn,
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const s64 last_vcn, int max_mp_size);
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int ntfs_mapping_pairs_build(const struct ntfs_volume *vol, s8 *dst,
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const int dst_len, const struct runlist_element *rl,
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const s64 first_vcn, const s64 last_vcn, s64 *const stop_vcn,
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struct runlist_element **stop_rl, unsigned int *de_cluster_count);
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int ntfs_rl_truncate_nolock(const struct ntfs_volume *vol,
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struct runlist *const runlist, const s64 new_length);
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int ntfs_rl_sparse(struct runlist_element *rl);
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s64 ntfs_rl_get_compressed_size(struct ntfs_volume *vol, struct runlist_element *rl);
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struct runlist_element *ntfs_rl_insert_range(struct runlist_element *dst_rl, int dst_cnt,
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struct runlist_element *src_rl, int src_cnt, size_t *new_cnt);
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struct runlist_element *ntfs_rl_punch_hole(struct runlist_element *dst_rl, int dst_cnt,
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s64 start_vcn, s64 len, struct runlist_element **punch_rl,
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size_t *new_rl_cnt);
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struct runlist_element *ntfs_rl_collapse_range(struct runlist_element *dst_rl, int dst_cnt,
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s64 start_vcn, s64 len, struct runlist_element **punch_rl,
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size_t *new_rl_cnt);
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struct runlist_element *ntfs_rl_realloc(struct runlist_element *rl, int old_size,
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int new_size);
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#endif /* _LINUX_NTFS_RUNLIST_H */
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