1 /*
2  * ntfs.h - Defines for NTFS Linux kernel driver.
3  *
4  * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
5  * Copyright (C) 2002 Richard Russon
6  *
7  * This program/include file is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as published
9  * by the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program/include file is distributed in the hope that it will be
13  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program (in the main directory of the Linux-NTFS
19  * distribution in the file COPYING); if not, write to the Free Software
20  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22 
23 #ifndef _LINUX_NTFS_H
24 #define _LINUX_NTFS_H
25 
26 #include <linux/stddef.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/compiler.h>
30 #include <linux/fs.h>
31 #include <linux/nls.h>
32 #include <linux/smp.h>
33 #include <linux/pagemap.h>
34 
35 #include "types.h"
36 #include "volume.h"
37 #include "layout.h"
38 
39 typedef enum {
40 	NTFS_BLOCK_SIZE		= 512,
41 	NTFS_BLOCK_SIZE_BITS	= 9,
42 	NTFS_SB_MAGIC		= 0x5346544e,	/* 'NTFS' */
43 	NTFS_MAX_NAME_LEN	= 255,
44 	NTFS_MAX_ATTR_NAME_LEN	= 255,
45 	NTFS_MAX_CLUSTER_SIZE	= 64 * 1024,	/* 64kiB */
46 	NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_SIZE,
47 } NTFS_CONSTANTS;
48 
49 /* Global variables. */
50 
51 /* Slab caches (from super.c). */
52 extern struct kmem_cache *ntfs_name_cache;
53 extern struct kmem_cache *ntfs_inode_cache;
54 extern struct kmem_cache *ntfs_big_inode_cache;
55 extern struct kmem_cache *ntfs_attr_ctx_cache;
56 extern struct kmem_cache *ntfs_index_ctx_cache;
57 
58 /* The various operations structs defined throughout the driver files. */
59 extern const struct address_space_operations ntfs_normal_aops;
60 extern const struct address_space_operations ntfs_compressed_aops;
61 extern const struct address_space_operations ntfs_mst_aops;
62 
63 extern const struct  file_operations ntfs_file_ops;
64 extern const struct inode_operations ntfs_file_inode_ops;
65 
66 extern const struct  file_operations ntfs_dir_ops;
67 extern const struct inode_operations ntfs_dir_inode_ops;
68 
69 extern const struct  file_operations ntfs_empty_file_ops;
70 extern const struct inode_operations ntfs_empty_inode_ops;
71 
72 extern 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  */
NTFS_SB(struct super_block * sb)80 static 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 */
88 extern int ntfs_read_compressed_block(struct page *page);
89 extern int allocate_compression_buffers(void);
90 extern void free_compression_buffers(void);
91 
92 /* From fs/ntfs/super.c */
93 #define default_upcase_len 0x10000
94 extern struct mutex ntfs_lock;
95 
96 typedef struct {
97 	int val;
98 	char *str;
99 } option_t;
100 extern const option_t on_errors_arr[];
101 
102 /* From fs/ntfs/mst.c */
103 extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
104 extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
105 extern void post_write_mst_fixup(NTFS_RECORD *b);
106 
107 /* From fs/ntfs/unistr.c */
108 extern 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);
112 extern 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);
116 extern int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n);
117 extern int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
118 		const ntfschar *upcase, const u32 upcase_size);
119 extern void ntfs_upcase_name(ntfschar *name, u32 name_len,
120 		const ntfschar *upcase, const u32 upcase_len);
121 extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
122 		const ntfschar *upcase, const u32 upcase_len);
123 extern 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);
127 extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
128 		const int ins_len, ntfschar **outs);
129 extern 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 */
133 extern ntfschar *generate_default_upcase(void);
134 
ntfs_ffs(int x)135 static 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