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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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