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Ext2S: Fix off-by-one error in block allocation.

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This commit is contained in:
Andreas Kling 2019-04-23 16:38:45 +02:00
parent b041fc57de
commit fd500c79d6
Notes: sideshowbarker 2024-07-19 14:37:01 +09:00
1 changed files with 2 additions and 2 deletions
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4
Kernel/FileSystem/Ext2FileSystem.cpp
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@ -827,7 +827,7 @@ Vector<Ext2FS::BlockIndex> Ext2FS::allocate_blocks(GroupIndex group_index, int c
auto bitmap_block = read_block(bgd.bg_block_bitmap);
int blocks_in_group = min(blocks_per_group(), super_block().s_blocks_count);
auto block_bitmap = Bitmap::wrap(bitmap_block.pointer(), blocks_in_group);
BlockIndex first_block_in_group = (group_index - 1) * blocks_per_group() + 1;
BlockIndex first_block_in_group = (group_index - 1) * blocks_per_group();
for (int i = 0; i < block_bitmap.size(); ++i) {
if (!block_bitmap.get(i)) {
blocks.append(first_block_in_group + i);
@ -986,7 +986,7 @@ bool Ext2FS::set_block_allocation_state(BlockIndex block_index, bool new_state)
unsigned group_index = group_index_from_block_index(block_index);
auto& bgd = group_descriptor(group_index);
BlockIndex index_in_group = block_index - ((group_index - 1) * blocks_per_group());
unsigned bit_index = (index_in_group - 1) % blocks_per_group();
unsigned bit_index = index_in_group % blocks_per_group();
dbgprintf(" index_in_group: %u\n", index_in_group);
dbgprintf(" blocks_per_group: %u\n", blocks_per_group());
dbgprintf(" bit_index: %u\n", bit_index);