Root/fs/ntfs/attrib.h

1/*
2 * attrib.h - Defines for attribute handling in NTFS Linux kernel driver.
3 * Part of the Linux-NTFS project.
4 *
5 * Copyright (c) 2001-2005 Anton Altaparmakov
6 * Copyright (c) 2002 Richard Russon
7 *
8 * This program/include file is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published
10 * by the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program/include file is distributed in the hope that it will be
14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program (in the main directory of the Linux-NTFS
20 * distribution in the file COPYING); if not, write to the Free Software
21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#ifndef _LINUX_NTFS_ATTRIB_H
25#define _LINUX_NTFS_ATTRIB_H
26
27#include "endian.h"
28#include "types.h"
29#include "layout.h"
30#include "inode.h"
31#include "runlist.h"
32#include "volume.h"
33
34/**
35 * ntfs_attr_search_ctx - used in attribute search functions
36 * @mrec: buffer containing mft record to search
37 * @attr: attribute record in @mrec where to begin/continue search
38 * @is_first: if true ntfs_attr_lookup() begins search with @attr, else after
39 *
40 * Structure must be initialized to zero before the first call to one of the
41 * attribute search functions. Initialize @mrec to point to the mft record to
42 * search, and @attr to point to the first attribute within @mrec (not necessary
43 * if calling the _first() functions), and set @is_first to 'true' (not necessary
44 * if calling the _first() functions).
45 *
46 * If @is_first is 'true', the search begins with @attr. If @is_first is 'false',
47 * the search begins after @attr. This is so that, after the first call to one
48 * of the search attribute functions, we can call the function again, without
49 * any modification of the search context, to automagically get the next
50 * matching attribute.
51 */
52typedef struct {
53    MFT_RECORD *mrec;
54    ATTR_RECORD *attr;
55    bool is_first;
56    ntfs_inode *ntfs_ino;
57    ATTR_LIST_ENTRY *al_entry;
58    ntfs_inode *base_ntfs_ino;
59    MFT_RECORD *base_mrec;
60    ATTR_RECORD *base_attr;
61} ntfs_attr_search_ctx;
62
63extern int ntfs_map_runlist_nolock(ntfs_inode *ni, VCN vcn,
64        ntfs_attr_search_ctx *ctx);
65extern int ntfs_map_runlist(ntfs_inode *ni, VCN vcn);
66
67extern LCN ntfs_attr_vcn_to_lcn_nolock(ntfs_inode *ni, const VCN vcn,
68        const bool write_locked);
69
70extern runlist_element *ntfs_attr_find_vcn_nolock(ntfs_inode *ni,
71        const VCN vcn, ntfs_attr_search_ctx *ctx);
72
73int ntfs_attr_lookup(const ATTR_TYPE type, const ntfschar *name,
74        const u32 name_len, const IGNORE_CASE_BOOL ic,
75        const VCN lowest_vcn, const u8 *val, const u32 val_len,
76        ntfs_attr_search_ctx *ctx);
77
78extern int load_attribute_list(ntfs_volume *vol, runlist *rl, u8 *al_start,
79        const s64 size, const s64 initialized_size);
80
81static inline s64 ntfs_attr_size(const ATTR_RECORD *a)
82{
83    if (!a->non_resident)
84        return (s64)le32_to_cpu(a->data.resident.value_length);
85    return sle64_to_cpu(a->data.non_resident.data_size);
86}
87
88extern void ntfs_attr_reinit_search_ctx(ntfs_attr_search_ctx *ctx);
89extern ntfs_attr_search_ctx *ntfs_attr_get_search_ctx(ntfs_inode *ni,
90        MFT_RECORD *mrec);
91extern void ntfs_attr_put_search_ctx(ntfs_attr_search_ctx *ctx);
92
93#ifdef NTFS_RW
94
95extern int ntfs_attr_size_bounds_check(const ntfs_volume *vol,
96        const ATTR_TYPE type, const s64 size);
97extern int ntfs_attr_can_be_non_resident(const ntfs_volume *vol,
98        const ATTR_TYPE type);
99extern int ntfs_attr_can_be_resident(const ntfs_volume *vol,
100        const ATTR_TYPE type);
101
102extern int ntfs_attr_record_resize(MFT_RECORD *m, ATTR_RECORD *a, u32 new_size);
103extern int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
104        const u32 new_size);
105
106extern int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size);
107
108extern s64 ntfs_attr_extend_allocation(ntfs_inode *ni, s64 new_alloc_size,
109        const s64 new_data_size, const s64 data_start);
110
111extern int ntfs_attr_set(ntfs_inode *ni, const s64 ofs, const s64 cnt,
112        const u8 val);
113
114#endif /* NTFS_RW */
115
116#endif /* _LINUX_NTFS_ATTRIB_H */
117

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