fs/ntfs/bitmap.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  * bitmap.h - Defines for NTFS kernel bitmap handling.  Part of the Linux-NTFS
0004  *        project.
0005  *
0006  * Copyright (c) 2004 Anton Altaparmakov
0007  */
0008
0009 #ifndef _LINUX_NTFS_BITMAP_H
0010 #define _LINUX_NTFS_BITMAP_H
0011
0012 #ifdef NTFS_RW
0013
0014 #include <linux/fs.h>
0015
0016 #include "types.h"
0017
0018 extern int __ntfs_bitmap_set_bits_in_run(struct inode *vi, const s64 start_bit,
0019         const s64 count, const u8 value, const bool is_rollback);
0020
0021 /**
0022  * ntfs_bitmap_set_bits_in_run - set a run of bits in a bitmap to a value
0023  * @vi:         vfs inode describing the bitmap
0024  * @start_bit:      first bit to set
0025  * @count:      number of bits to set
0026  * @value:      value to set the bits to (i.e. 0 or 1)
0027  *
0028  * Set @count bits starting at bit @start_bit in the bitmap described by the
0029  * vfs inode @vi to @value, where @value is either 0 or 1.
0030  *
0031  * Return 0 on success and -errno on error.
0032  */
0033 static inline int ntfs_bitmap_set_bits_in_run(struct inode *vi,
0034         const s64 start_bit, const s64 count, const u8 value)
0035 {
0036     return __ntfs_bitmap_set_bits_in_run(vi, start_bit, count, value,
0037             false);
0038 }
0039
0040 /**
0041  * ntfs_bitmap_set_run - set a run of bits in a bitmap
0042  * @vi:     vfs inode describing the bitmap
0043  * @start_bit:  first bit to set
0044  * @count:  number of bits to set
0045  *
0046  * Set @count bits starting at bit @start_bit in the bitmap described by the
0047  * vfs inode @vi.
0048  *
0049  * Return 0 on success and -errno on error.
0050  */
0051 static inline int ntfs_bitmap_set_run(struct inode *vi, const s64 start_bit,
0052         const s64 count)
0053 {
0054     return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 1);
0055 }
0056
0057 /**
0058  * ntfs_bitmap_clear_run - clear a run of bits in a bitmap
0059  * @vi:     vfs inode describing the bitmap
0060  * @start_bit:  first bit to clear
0061  * @count:  number of bits to clear
0062  *
0063  * Clear @count bits starting at bit @start_bit in the bitmap described by the
0064  * vfs inode @vi.
0065  *
0066  * Return 0 on success and -errno on error.
0067  */
0068 static inline int ntfs_bitmap_clear_run(struct inode *vi, const s64 start_bit,
0069         const s64 count)
0070 {
0071     return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 0);
0072 }
0073
0074 /**
0075  * ntfs_bitmap_set_bit - set a bit in a bitmap
0076  * @vi:     vfs inode describing the bitmap
0077  * @bit:    bit to set
0078  *
0079  * Set bit @bit in the bitmap described by the vfs inode @vi.
0080  *
0081  * Return 0 on success and -errno on error.
0082  */
0083 static inline int ntfs_bitmap_set_bit(struct inode *vi, const s64 bit)
0084 {
0085     return ntfs_bitmap_set_run(vi, bit, 1);
0086 }
0087
0088 /**
0089  * ntfs_bitmap_clear_bit - clear a bit in a bitmap
0090  * @vi:     vfs inode describing the bitmap
0091  * @bit:    bit to clear
0092  *
0093  * Clear bit @bit in the bitmap described by the vfs inode @vi.
0094  *
0095  * Return 0 on success and -errno on error.
0096  */
0097 static inline int ntfs_bitmap_clear_bit(struct inode *vi, const s64 bit)
0098 {
0099     return ntfs_bitmap_clear_run(vi, bit, 1);
0100 }
0101
0102 #endif /* NTFS_RW */
0103
0104 #endif /* defined _LINUX_NTFS_BITMAP_H */