1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * bitmap.h - Defines for NTFS kernel bitmap handling. Part of the Linux-NTFS
4 * project.
5 *
6 * Copyright (c) 2004 Anton Altaparmakov
7 */
8
9 #ifndef _LINUX_NTFS_BITMAP_H
10 #define _LINUX_NTFS_BITMAP_H
11
12 #ifdef NTFS_RW
13
14 #include <linux/fs.h>
15
16 #include "types.h"
17
18 extern int __ntfs_bitmap_set_bits_in_run(struct inode *vi, const s64 start_bit,
19 const s64 count, const u8 value, const bool is_rollback);
20
21 /**
22 * ntfs_bitmap_set_bits_in_run - set a run of bits in a bitmap to a value
23 * @vi: vfs inode describing the bitmap
24 * @start_bit: first bit to set
25 * @count: number of bits to set
26 * @value: value to set the bits to (i.e. 0 or 1)
27 *
28 * Set @count bits starting at bit @start_bit in the bitmap described by the
29 * vfs inode @vi to @value, where @value is either 0 or 1.
30 *
31 * Return 0 on success and -errno on error.
32 */
33 static inline int ntfs_bitmap_set_bits_in_run(struct inode *vi,
34 const s64 start_bit, const s64 count, const u8 value)
35 {
36 return __ntfs_bitmap_set_bits_in_run(vi, start_bit, count, value,
37 false);
38 }
39
40 /**
41 * ntfs_bitmap_set_run - set a run of bits in a bitmap
42 * @vi: vfs inode describing the bitmap
43 * @start_bit: first bit to set
44 * @count: number of bits to set
45 *
46 * Set @count bits starting at bit @start_bit in the bitmap described by the
47 * vfs inode @vi.
48 *
49 * Return 0 on success and -errno on error.
50 */
51 static inline int ntfs_bitmap_set_run(struct inode *vi, const s64 start_bit,
52 const s64 count)
53 {
54 return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 1);
55 }
56
57 /**
58 * ntfs_bitmap_clear_run - clear a run of bits in a bitmap
59 * @vi: vfs inode describing the bitmap
60 * @start_bit: first bit to clear
61 * @count: number of bits to clear
62 *
63 * Clear @count bits starting at bit @start_bit in the bitmap described by the
64 * vfs inode @vi.
65 *
66 * Return 0 on success and -errno on error.
67 */
68 static inline int ntfs_bitmap_clear_run(struct inode *vi, const s64 start_bit,
69 const s64 count)
70 {
71 return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 0);
72 }
73
74 /**
75 * ntfs_bitmap_set_bit - set a bit in a bitmap
76 * @vi: vfs inode describing the bitmap
77 * @bit: bit to set
78 *
79 * Set bit @bit in the bitmap described by the vfs inode @vi.
80 *
81 * Return 0 on success and -errno on error.
82 */
83 static inline int ntfs_bitmap_set_bit(struct inode *vi, const s64 bit)
84 {
85 return ntfs_bitmap_set_run(vi, bit, 1);
86 }
87
88 /**
89 * ntfs_bitmap_clear_bit - clear a bit in a bitmap
90 * @vi: vfs inode describing the bitmap
91 * @bit: bit to clear
92 *
93 * Clear 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_clear_bit(struct inode *vi, const s64 bit)
98 {
99 return ntfs_bitmap_clear_run(vi, bit, 1);
100 }
101
102 #endif /* NTFS_RW */
103
104 #endif /* defined _LINUX_NTFS_BITMAP_H */