Root/fs/ntfs/ntfs.h

1/*
2 * ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS
3 * 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_H
25#define _LINUX_NTFS_H
26
27#include <linux/stddef.h>
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/compiler.h>
31#include <linux/fs.h>
32#include <linux/nls.h>
33#include <linux/smp.h>
34#include <linux/pagemap.h>
35
36#include "types.h"
37#include "volume.h"
38#include "layout.h"
39
40typedef enum {
41    NTFS_BLOCK_SIZE = 512,
42    NTFS_BLOCK_SIZE_BITS = 9,
43    NTFS_SB_MAGIC = 0x5346544e, /* 'NTFS' */
44    NTFS_MAX_NAME_LEN = 255,
45    NTFS_MAX_ATTR_NAME_LEN = 255,
46    NTFS_MAX_CLUSTER_SIZE = 64 * 1024, /* 64kiB */
47    NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_CACHE_SIZE,
48} NTFS_CONSTANTS;
49
50/* Global variables. */
51
52/* Slab caches (from super.c). */
53extern struct kmem_cache *ntfs_name_cache;
54extern struct kmem_cache *ntfs_inode_cache;
55extern struct kmem_cache *ntfs_big_inode_cache;
56extern struct kmem_cache *ntfs_attr_ctx_cache;
57extern struct kmem_cache *ntfs_index_ctx_cache;
58
59/* The various operations structs defined throughout the driver files. */
60extern const struct address_space_operations ntfs_aops;
61extern const struct address_space_operations ntfs_mst_aops;
62
63extern const struct file_operations ntfs_file_ops;
64extern const struct inode_operations ntfs_file_inode_ops;
65
66extern const struct file_operations ntfs_dir_ops;
67extern const struct inode_operations ntfs_dir_inode_ops;
68
69extern const struct file_operations ntfs_empty_file_ops;
70extern const struct inode_operations ntfs_empty_inode_ops;
71
72extern const struct export_operations ntfs_export_ops;
73
74/**
75 * NTFS_SB - return the ntfs volume given a vfs super block
76 * @sb: VFS super block
77 *
78 * NTFS_SB() returns the ntfs volume associated with the VFS super block @sb.
79 */
80static inline ntfs_volume *NTFS_SB(struct super_block *sb)
81{
82    return sb->s_fs_info;
83}
84
85/* Declarations of functions and global variables. */
86
87/* From fs/ntfs/compress.c */
88extern int ntfs_read_compressed_block(struct page *page);
89extern int allocate_compression_buffers(void);
90extern void free_compression_buffers(void);
91
92/* From fs/ntfs/super.c */
93#define default_upcase_len 0x10000
94extern struct mutex ntfs_lock;
95
96typedef struct {
97    int val;
98    char *str;
99} option_t;
100extern const option_t on_errors_arr[];
101
102/* From fs/ntfs/mst.c */
103extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
104extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
105extern void post_write_mst_fixup(NTFS_RECORD *b);
106
107/* From fs/ntfs/unistr.c */
108extern bool ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
109        const ntfschar *s2, size_t s2_len,
110        const IGNORE_CASE_BOOL ic,
111        const ntfschar *upcase, const u32 upcase_size);
112extern int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
113        const ntfschar *name2, const u32 name2_len,
114        const int err_val, const IGNORE_CASE_BOOL ic,
115        const ntfschar *upcase, const u32 upcase_len);
116extern int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n);
117extern int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
118        const ntfschar *upcase, const u32 upcase_size);
119extern void ntfs_upcase_name(ntfschar *name, u32 name_len,
120        const ntfschar *upcase, const u32 upcase_len);
121extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
122        const ntfschar *upcase, const u32 upcase_len);
123extern int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
124        FILE_NAME_ATTR *file_name_attr2,
125        const int err_val, const IGNORE_CASE_BOOL ic,
126        const ntfschar *upcase, const u32 upcase_len);
127extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
128        const int ins_len, ntfschar **outs);
129extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
130        const int ins_len, unsigned char **outs, int outs_len);
131
132/* From fs/ntfs/upcase.c */
133extern ntfschar *generate_default_upcase(void);
134
135static inline int ntfs_ffs(int x)
136{
137    int r = 1;
138
139    if (!x)
140        return 0;
141    if (!(x & 0xffff)) {
142        x >>= 16;
143        r += 16;
144    }
145    if (!(x & 0xff)) {
146        x >>= 8;
147        r += 8;
148    }
149    if (!(x & 0xf)) {
150        x >>= 4;
151        r += 4;
152    }
153    if (!(x & 3)) {
154        x >>= 2;
155        r += 2;
156    }
157    if (!(x & 1)) {
158        x >>= 1;
159        r += 1;
160    }
161    return r;
162}
163
164#endif /* _LINUX_NTFS_H */
165

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