dfd845b131
Changes: - Added few assertions to check if some assumptions are correct - Fix removing blocks during trucate and inode removal - Clear entry in inode table after inode has been removed Signed-off-by: Franciszek Zdobylak <fzdobylak@antmicro.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* Copyright (c) 2023 Antmicro <www.antmicro.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __EXT2_BITMAP_H__
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#define __EXT2_BITMAP_H__
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#include <stdint.h>
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#include <stdbool.h>
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/* Functions to make operations on bitmaps.
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*
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* NOTICE: Assumed size of the bitmap is 256 B (1024 bits).
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* (Hence, the greatest valid index is 1023.)
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*/
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/**
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* @brief Set bit at given index to one
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*
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* @param bm Pointer to bitmap
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* @param index Index in bitmap
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* @param size Size of bitmap in bytes
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*
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* @retval 0 on success;
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* @retval -EINVAL when index is too big;
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*/
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int ext2_bitmap_set(uint8_t *bm, uint32_t index, uint32_t size);
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/**
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* @brief Set bit at given index to zero
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*
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* @param bm Pointer to bitmap
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* @param index Index in bitmap
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* @param size Size of bitmap in bytes
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*
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* @retval 0 on success;
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* @retval -EINVAL when index is too big;
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*/
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int ext2_bitmap_unset(uint8_t *bm, uint32_t index, uint32_t size);
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/**
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* @brief Find first bit set to zero in bitmap
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*
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* @param bm Pointer to bitmap
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* @param size Size of bitmap in bytes
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*
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* @retval >0 found inode number;
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* @retval -ENOSPC when not found;
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*/
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int32_t ext2_bitmap_find_free(uint8_t *bm, uint32_t size);
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/**
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* @brief Helper function to count bits set in bitmap
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*
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* @param bm Pointer to bitmap
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* @param size Size of bitmap in bits
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*
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* @retval Number of set bits in bitmap;
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*/
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uint32_t ext2_bitmap_count_set(uint8_t *bm, uint32_t size);
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#endif /* __EXT2_BITMAP_H__ */
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