/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* attrib.h - Defines for attribute 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_ATTRIB_H
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#define _LINUX_NTFS_ATTRIB_H
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#include "endian.h"
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#include "types.h"
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#include "layout.h"
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#include "inode.h"
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#include "runlist.h"
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#include "volume.h"
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/**
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* ntfs_attr_search_ctx - used in attribute search functions
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* @mrec: buffer containing mft record to search
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* @attr: attribute record in @mrec where to begin/continue search
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* @is_first: if true ntfs_attr_lookup() begins search with @attr, else after
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*
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* Structure must be initialized to zero before the first call to one of the
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* attribute search functions. Initialize @mrec to point to the mft record to
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* search, and @attr to point to the first attribute within @mrec (not necessary
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* if calling the _first() functions), and set @is_first to 'true' (not necessary
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* if calling the _first() functions).
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*
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* If @is_first is 'true', the search begins with @attr. If @is_first is 'false',
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* the search begins after @attr. This is so that, after the first call to one
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* of the search attribute functions, we can call the function again, without
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* any modification of the search context, to automagically get the next
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* matching attribute.
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*/
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typedef struct {
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MFT_RECORD *mrec;
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ATTR_RECORD *attr;
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bool is_first;
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ntfs_inode *ntfs_ino;
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ATTR_LIST_ENTRY *al_entry;
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ntfs_inode *base_ntfs_ino;
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MFT_RECORD *base_mrec;
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ATTR_RECORD *base_attr;
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} ntfs_attr_search_ctx;
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extern int ntfs_map_runlist_nolock(ntfs_inode *ni, VCN vcn,
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ntfs_attr_search_ctx *ctx);
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extern int ntfs_map_runlist(ntfs_inode *ni, VCN vcn);
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extern LCN ntfs_attr_vcn_to_lcn_nolock(ntfs_inode *ni, const VCN vcn,
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const bool write_locked);
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extern runlist_element *ntfs_attr_find_vcn_nolock(ntfs_inode *ni,
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const VCN vcn, ntfs_attr_search_ctx *ctx);
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int ntfs_attr_lookup(const ATTR_TYPE type, const ntfschar *name,
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const u32 name_len, const IGNORE_CASE_BOOL ic,
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const VCN lowest_vcn, const u8 *val, const u32 val_len,
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ntfs_attr_search_ctx *ctx);
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extern int load_attribute_list(ntfs_volume *vol, runlist *rl, u8 *al_start,
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const s64 size, const s64 initialized_size);
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static inline s64 ntfs_attr_size(const ATTR_RECORD *a)
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{
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if (!a->non_resident)
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return (s64)le32_to_cpu(a->data.resident.value_length);
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return sle64_to_cpu(a->data.non_resident.data_size);
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}
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extern void ntfs_attr_reinit_search_ctx(ntfs_attr_search_ctx *ctx);
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extern ntfs_attr_search_ctx *ntfs_attr_get_search_ctx(ntfs_inode *ni,
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MFT_RECORD *mrec);
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extern void ntfs_attr_put_search_ctx(ntfs_attr_search_ctx *ctx);
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#ifdef NTFS_RW
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extern int ntfs_attr_size_bounds_check(const ntfs_volume *vol,
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const ATTR_TYPE type, const s64 size);
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extern int ntfs_attr_can_be_non_resident(const ntfs_volume *vol,
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const ATTR_TYPE type);
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extern int ntfs_attr_can_be_resident(const ntfs_volume *vol,
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const ATTR_TYPE type);
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extern int ntfs_attr_record_resize(MFT_RECORD *m, ATTR_RECORD *a, u32 new_size);
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extern int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
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const u32 new_size);
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extern int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size);
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extern s64 ntfs_attr_extend_allocation(ntfs_inode *ni, s64 new_alloc_size,
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const s64 new_data_size, const s64 data_start);
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extern int ntfs_attr_set(ntfs_inode *ni, const s64 ofs, const s64 cnt,
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const u8 val);
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#endif /* NTFS_RW */
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#endif /* _LINUX_NTFS_ATTRIB_H */
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