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