fs/ntfs/bitmap.h

   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 */