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Linux/fs/ntfs/bitmap.h

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  1 /*
  2  * bitmap.h - Defines for NTFS kernel bitmap handling.  Part of the Linux-NTFS
  3  *            project.
  4  *
  5  * Copyright (c) 2004 Anton Altaparmakov
  6  *
  7  * This program/include file is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License as published
  9  * by the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program/include file is distributed in the hope that it will be
 13  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program (in the main directory of the Linux-NTFS
 19  * distribution in the file COPYING); if not, write to the Free Software
 20  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  */
 22 
 23 #ifndef _LINUX_NTFS_BITMAP_H
 24 #define _LINUX_NTFS_BITMAP_H
 25 
 26 #ifdef NTFS_RW
 27 
 28 #include <linux/fs.h>
 29 
 30 #include "types.h"
 31 
 32 extern int __ntfs_bitmap_set_bits_in_run(struct inode *vi, const s64 start_bit,
 33                 const s64 count, const u8 value, const bool is_rollback);
 34 
 35 /**
 36  * ntfs_bitmap_set_bits_in_run - set a run of bits in a bitmap to a value
 37  * @vi:                 vfs inode describing the bitmap
 38  * @start_bit:          first bit to set
 39  * @count:              number of bits to set
 40  * @value:              value to set the bits to (i.e. 0 or 1)
 41  *
 42  * Set @count bits starting at bit @start_bit in the bitmap described by the
 43  * vfs inode @vi to @value, where @value is either 0 or 1.
 44  *
 45  * Return 0 on success and -errno on error.
 46  */
 47 static inline int ntfs_bitmap_set_bits_in_run(struct inode *vi,
 48                 const s64 start_bit, const s64 count, const u8 value)
 49 {
 50         return __ntfs_bitmap_set_bits_in_run(vi, start_bit, count, value,
 51                         false);
 52 }
 53 
 54 /**
 55  * ntfs_bitmap_set_run - set a run of bits in a bitmap
 56  * @vi:         vfs inode describing the bitmap
 57  * @start_bit:  first bit to set
 58  * @count:      number of bits to set
 59  *
 60  * Set @count bits starting at bit @start_bit in the bitmap described by the
 61  * vfs inode @vi.
 62  *
 63  * Return 0 on success and -errno on error.
 64  */
 65 static inline int ntfs_bitmap_set_run(struct inode *vi, const s64 start_bit,
 66                 const s64 count)
 67 {
 68         return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 1);
 69 }
 70 
 71 /**
 72  * ntfs_bitmap_clear_run - clear a run of bits in a bitmap
 73  * @vi:         vfs inode describing the bitmap
 74  * @start_bit:  first bit to clear
 75  * @count:      number of bits to clear
 76  *
 77  * Clear @count bits starting at bit @start_bit in the bitmap described by the
 78  * vfs inode @vi.
 79  *
 80  * Return 0 on success and -errno on error.
 81  */
 82 static inline int ntfs_bitmap_clear_run(struct inode *vi, const s64 start_bit,
 83                 const s64 count)
 84 {
 85         return ntfs_bitmap_set_bits_in_run(vi, start_bit, count, 0);
 86 }
 87 
 88 /**
 89  * ntfs_bitmap_set_bit - set a bit in a bitmap
 90  * @vi:         vfs inode describing the bitmap
 91  * @bit:        bit to set
 92  *
 93  * Set 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_set_bit(struct inode *vi, const s64 bit)
 98 {
 99         return ntfs_bitmap_set_run(vi, bit, 1);
100 }
101 
102 /**
103  * ntfs_bitmap_clear_bit - clear a bit in a bitmap
104  * @vi:         vfs inode describing the bitmap
105  * @bit:        bit to clear
106  *
107  * Clear bit @bit in the bitmap described by the vfs inode @vi.
108  *
109  * Return 0 on success and -errno on error.
110  */
111 static inline int ntfs_bitmap_clear_bit(struct inode *vi, const s64 bit)
112 {
113         return ntfs_bitmap_clear_run(vi, bit, 1);
114 }
115 
116 #endif /* NTFS_RW */
117 
118 #endif /* defined _LINUX_NTFS_BITMAP_H */
119 

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