119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*
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* bitmap.h - Defines for NTFS kernel bitmap handling. Part of the Linux-NTFS
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* project.
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*
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* Copyright (c) 2004 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_NTFS_BITMAP_H
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#define _LINUX_NTFS_BITMAP_H
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#ifdef NTFS_RW
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#include <linux/fs.h>
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#include "types.h"
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extern int __ntfs_bitmap_set_bits_in_run(struct inode *vi, const s64 start_bit,
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const s64 count, const u8 value, const bool is_rollback);
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/**
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* ntfs_bitmap_set_bits_in_run - set a run of bits in a bitmap to a value
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* @vi: vfs inode describing the bitmap
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* @start_bit: first bit to set
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* @count: number of bits to set
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* @value: value to set the bits to (i.e. 0 or 1)
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*
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* Set @count bits starting at bit @start_bit in the bitmap described by the
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* vfs inode @vi to @value, where @value is either 0 or 1.
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*
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* Return 0 on success and -errno on error.
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*/
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static inline int ntfs_bitmap_set_bits_in_run(struct inode *vi,
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const s64 start_bit, const s64 count, const u8 value)
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{
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return __ntfs_bitmap_set_bits_in_run(vi, start_bit, count, value,
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false);
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}
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/**
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* ntfs_bitmap_set_run - set a run of bits in a bitmap
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* @vi: vfs inode describing the bitmap
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* @start_bit: first bit to set
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* @count: number of bits to set
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*
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* Set @count bits starting at bit @start_bit in the bitmap described by the
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* vfs inode @vi.
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*
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* Return 0 on success and -errno on error.
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*/
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static inline int ntfs_bitmap_set_run(struct inode *vi, const s64 start_bit,
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const s64 count)
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{
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return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 1);
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}
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/**
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* ntfs_bitmap_clear_run - clear a run of bits in a bitmap
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* @vi: vfs inode describing the bitmap
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* @start_bit: first bit to clear
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* @count: number of bits to clear
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*
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* Clear @count bits starting at bit @start_bit in the bitmap described by the
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* vfs inode @vi.
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*
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* Return 0 on success and -errno on error.
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*/
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static inline int ntfs_bitmap_clear_run(struct inode *vi, const s64 start_bit,
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const s64 count)
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{
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return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 0);
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}
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/**
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* ntfs_bitmap_set_bit - set a bit in a bitmap
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* @vi: vfs inode describing the bitmap
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* @bit: bit to set
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*
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* Set bit @bit in the bitmap described by the vfs inode @vi.
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*
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* Return 0 on success and -errno on error.
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*/
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static inline int ntfs_bitmap_set_bit(struct inode *vi, const s64 bit)
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{
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return ntfs_bitmap_set_run(vi, bit, 1);
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}
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/**
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* ntfs_bitmap_clear_bit - clear a bit in a bitmap
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* @vi: vfs inode describing the bitmap
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* @bit: bit to clear
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*
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* Clear bit @bit in the bitmap described by the vfs inode @vi.
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*
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* Return 0 on success and -errno on error.
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*/
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static inline int ntfs_bitmap_clear_bit(struct inode *vi, const s64 bit)
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{
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return ntfs_bitmap_clear_run(vi, bit, 1);
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}
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#endif /* NTFS_RW */
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#endif /* defined _LINUX_NTFS_BITMAP_H */
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