2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 /** @addtogroup lwext4
34 * @brief Block/inode bitmap allocator.
37 #ifndef EXT4_BITMAP_H_
38 #define EXT4_BITMAP_H_
40 #include "ext4_config.h"
45 /**@brief Set bitmap bit.
47 * @param bit bit to set*/
48 static inline void ext4_bmap_bit_set(uint8_t *bmap, uint32_t bit)
50 *(bmap + (bit >> 3)) |= (1 << (bit & 7));
53 /**@brief Clear bitmap bit.
54 * @param bmap bitmap buffer
55 * @param bit bit to clear*/
56 static inline void ext4_bmap_bit_clr(uint8_t *bmap, uint32_t bit)
58 *(bmap + (bit >> 3)) &= ~(1 << (bit & 7));
61 /**@brief Check if the bitmap bit is set.
62 * @param bmap bitmap buffer
63 * @param bit bit to check*/
64 static inline bool ext4_bmap_is_bit_set(uint8_t *bmap, uint32_t bit)
66 return (*(bmap + (bit >> 3)) & (1 << (bit & 7)));
69 /**@brief Check if the bitmap bit is clear.
70 * @param bmap bitmap buffer
71 * @param bit bit to check*/
72 static inline bool ext4_bmap_is_bit_clr(uint8_t *bmap, uint32_t bit)
74 return !ext4_bmap_is_bit_set(bmap, bit);
77 /**@brief Free range of bits in bitmap.
78 * @param bmap bitmap buffer
79 * @param sbit start bit
80 * @param bcnt bit count*/
81 void ext4_bmap_bits_free(uint8_t *bmap, uint32_t sbit, uint32_t bcnt);
83 /**@brief Find first clear bit in bitmap.
84 * @param sbit start bit of search
85 * @param ebit end bit of search
86 * @param bit_id output parameter (first free bit)
87 * @return standard error code*/
88 int ext4_bmap_bit_find_clr(uint8_t *bmap, uint32_t sbit, uint32_t ebit,
91 #endif /* EXT4_BITMAP_H_ */