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 | is_rollback: 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, value: 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, value: 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, start_bit: bit, count: 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, start_bit: bit, count: 1); |
100 | } |
101 | |
102 | #endif /* NTFS_RW */ |
103 | |
104 | #endif /* defined _LINUX_NTFS_BITMAP_H */ |
105 | |