1 /*
2 * bitmap.h - Defines for NTFS kernel bitmap handling. Part of the Linux-NTFS
3 * project.
4 *
5 * Copyright (c) 2004 Anton Altaparmakov
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_BITMAP_H
24 #define _LINUX_NTFS_BITMAP_H
25
26 #ifdef NTFS_RW
27
28 #include <linux/fs.h>
29
30 #include "types.h"
31
32 extern int __ntfs_bitmap_set_bits_in_run(struct inode *vi, const s64 start_bit,
33 const s64 count, const u8 value, const bool is_rollback);
34
35 /**
36 * ntfs_bitmap_set_bits_in_run - set a run of bits in a bitmap to a value
37 * @vi: vfs inode describing the bitmap
38 * @start_bit: first bit to set
39 * @count: number of bits to set
40 * @value: value to set the bits to (i.e. 0 or 1)
41 *
42 * Set @count bits starting at bit @start_bit in the bitmap described by the
43 * vfs inode @vi to @value, where @value is either 0 or 1.
44 *
45 * Return 0 on success and -errno on error.
46 */
47 static inline int ntfs_bitmap_set_bits_in_run(struct inode *vi,
48 const s64 start_bit, const s64 count, const u8 value)
49 {
50 return __ntfs_bitmap_set_bits_in_run(vi, start_bit, count, value,
51 false);
52 }
53
54 /**
55 * ntfs_bitmap_set_run - set a run of bits in a bitmap
56 * @vi: vfs inode describing the bitmap
57 * @start_bit: first bit to set
58 * @count: number of bits to set
59 *
60 * Set @count bits starting at bit @start_bit in the bitmap described by the
61 * vfs inode @vi.
62 *
63 * Return 0 on success and -errno on error.
64 */
65 static inline int ntfs_bitmap_set_run(struct inode *vi, const s64 start_bit,
66 const s64 count)
67 {
68 return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 1);
69 }
70
71 /**
72 * ntfs_bitmap_clear_run - clear a run of bits in a bitmap
73 * @vi: vfs inode describing the bitmap
74 * @start_bit: first bit to clear
75 * @count: number of bits to clear
76 *
77 * Clear @count bits starting at bit @start_bit in the bitmap described by the
78 * vfs inode @vi.
79 *
80 * Return 0 on success and -errno on error.
81 */
82 static inline int ntfs_bitmap_clear_run(struct inode *vi, const s64 start_bit,
83 const s64 count)
84 {
85 return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 0);
86 }
87
88 /**
89 * ntfs_bitmap_set_bit - set a bit in a bitmap
90 * @vi: vfs inode describing the bitmap
91 * @bit: bit to set
92 *
93 * Set bit @bit in the bitmap described by the vfs inode @vi.
94 *
95 * Return 0 on success and -errno on error.
96 */
97 static inline int ntfs_bitmap_set_bit(struct inode *vi, const s64 bit)
98 {
99 return ntfs_bitmap_set_run(vi, bit, 1);
100 }
101
102 /**
103 * ntfs_bitmap_clear_bit - clear a bit in a bitmap
104 * @vi: vfs inode describing the bitmap
105 * @bit: bit to clear
106 *
107 * Clear bit @bit in the bitmap described by the vfs inode @vi.
108 *
109 * Return 0 on success and -errno on error.
110 */
111 static inline int ntfs_bitmap_clear_bit(struct inode *vi, const s64 bit)
112 {
113 return ntfs_bitmap_clear_run(vi, bit, 1);
114 }
115
116 #endif /* NTFS_RW */
117
118 #endif /* defined _LINUX_NTFS_BITMAP_H */
119
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