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>
89 lines
1.8 KiB
C
89 lines
1.8 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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#include <stdint.h>
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#include <stdbool.h>
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#include <zephyr/kernel.h>
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#include <zephyr/logging/log.h>
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#include "ext2_bitmap.h"
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LOG_MODULE_DECLARE(ext2);
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/* NOTICE: Offsets in bitmap start with 0 */
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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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LOG_DBG("Setting %d bit in bitmap", index);
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uint32_t idx = index / 8;
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uint32_t off = index % 8;
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if (idx >= size) {
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LOG_ERR("Tried to set value outside of bitmap (%d)", index);
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return -EINVAL;
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}
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__ASSERT((bm[idx] & BIT(off)) == 0, "Bit %d set in bitmap", index);
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LOG_DBG("Bitmap %d: %x", idx, bm[idx]);
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bm[idx] |= BIT(off);
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LOG_DBG("Bitmap %d: %x", idx, bm[idx]);
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return 0;
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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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LOG_DBG("Unsetting %d bit in bitmap", index);
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uint32_t idx = index / 8;
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uint32_t off = index % 8;
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if (idx >= size) {
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LOG_ERR("Tried to unset value outside of bitmap (%d)", index);
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return -EINVAL;
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}
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__ASSERT(bm[idx] & BIT(off), "Bit %d not set in bitmap", index);
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LOG_DBG("Bitmap %d: %x", idx, bm[idx]);
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bm[idx] &= ~BIT(off);
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LOG_DBG("Bitmap %d: %x", idx, bm[idx]);
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return 0;
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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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for (int i = 0; i < size; ++i) {
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LOG_DBG("Bitmap %d: %x (%x)", i, bm[i], ~bm[i]);
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if (bm[i] < UINT8_MAX) {
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/* not all bits are set here */
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int off = find_lsb_set(~bm[i]) - 1;
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LOG_DBG("off: %d", off);
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return off + i * 8;
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}
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}
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return -ENOSPC;
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}
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uint32_t ext2_bitmap_count_set(uint8_t *bm, uint32_t size)
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{
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int32_t count = 0;
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for (uint32_t i = 0; i < size; i += 8) {
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uint8_t val = bm[i / 8];
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for (int b = 0; b < 8 && i + b < size; ++b) {
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count += (val >> b) & BIT(0);
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}
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}
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return count;
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}
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