xref: /openbmc/linux/fs/ntfs/bitmap.h (revision c4f7ac64)
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 */
105