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/* SPDX-License-Identifier: GPL-2.0-or-later */
* attrib.h - Defines for attribute handling in NTFS Linux kernel driver.
* Part of the Linux-NTFS project.
* Copyright (c) 2001-2005 Anton Altaparmakov
* Copyright (c) 2002 Richard Russon
#include "endian.h"
#include "types.h"
#include "layout.h"
#include "inode.h"
#include "runlist.h"
#include "volume.h"
* ntfs_attr_search_ctx - used in attribute search functions
* @mrec: buffer containing mft record to search
* @attr: attribute record in @mrec where to begin/continue search
* @is_first: if true ntfs_attr_lookup() begins search with @attr, else after
* Structure must be initialized to zero before the first call to one of the
* attribute search functions. Initialize @mrec to point to the mft record to
* search, and @attr to point to the first attribute within @mrec (not necessary
* if calling the _first() functions), and set @is_first to 'true' (not necessary
* if calling the _first() functions).
* If @is_first is 'true', the search begins with @attr. If @is_first is 'false',
* the search begins after @attr. This is so that, after the first call to one
* of the search attribute functions, we can call the function again, without
* any modification of the search context, to automagically get the next
* matching attribute.
typedef struct {
bool is_first;
ntfs_inode *ntfs_ino;
ATTR_LIST_ENTRY *al_entry;
ntfs_inode *base_ntfs_ino;
MFT_RECORD *base_mrec;
ATTR_RECORD *base_attr;
} ntfs_attr_search_ctx;
extern int ntfs_map_runlist_nolock(ntfs_inode *ni, VCN vcn,
ntfs_attr_search_ctx *ctx);
extern int ntfs_map_runlist(ntfs_inode *ni, VCN vcn);
extern LCN ntfs_attr_vcn_to_lcn_nolock(ntfs_inode *ni, const VCN vcn,
const bool write_locked);
extern runlist_element *ntfs_attr_find_vcn_nolock(ntfs_inode *ni,
const VCN vcn, ntfs_attr_search_ctx *ctx);
int ntfs_attr_lookup(const ATTR_TYPE type, const ntfschar *name,
const u32 name_len, const IGNORE_CASE_BOOL ic,
const VCN lowest_vcn, const u8 *val, const u32 val_len,
ntfs_attr_search_ctx *ctx);
extern int load_attribute_list(ntfs_volume *vol, runlist *rl, u8 *al_start,
const s64 size, const s64 initialized_size);
static inline s64 ntfs_attr_size(const ATTR_RECORD *a)
if (!a->non_resident)
return (s64)le32_to_cpu(a->data.resident.value_length);
return sle64_to_cpu(a->data.non_resident.data_size);
extern void ntfs_attr_reinit_search_ctx(ntfs_attr_search_ctx *ctx);
extern ntfs_attr_search_ctx *ntfs_attr_get_search_ctx(ntfs_inode *ni,
MFT_RECORD *mrec);
extern void ntfs_attr_put_search_ctx(ntfs_attr_search_ctx *ctx);
#ifdef NTFS_RW
extern int ntfs_attr_size_bounds_check(const ntfs_volume *vol,
const ATTR_TYPE type, const s64 size);
extern int ntfs_attr_can_be_non_resident(const ntfs_volume *vol,
const ATTR_TYPE type);
extern int ntfs_attr_can_be_resident(const ntfs_volume *vol,
const ATTR_TYPE type);
extern int ntfs_attr_record_resize(MFT_RECORD *m, ATTR_RECORD *a, u32 new_size);
extern int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
const u32 new_size);
extern int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size);
extern s64 ntfs_attr_extend_allocation(ntfs_inode *ni, s64 new_alloc_size,
const s64 new_data_size, const s64 data_start);
extern int ntfs_attr_set(ntfs_inode *ni, const s64 ofs, const s64 cnt,
const u8 val);
#endif /* NTFS_RW */
#endif /* _LINUX_NTFS_ATTRIB_H */