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Ext2FS: Fix broken logic for accessing inode and block bitmaps.

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This logic only worked for the very first block group.
This commit is contained in:
Andreas Kling 2019-02-11 12:46:56 +01:00
parent fd5136a1ab
commit f8951afe17
1 changed files with 10 additions and 6 deletions
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16
Kernel/Ext2FileSystem.cpp
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@ -933,8 +933,9 @@ bool Ext2FS::get_inode_allocation_state(InodeIndex index) const
{
if (index == 0)
return true;
auto& bgd = group_descriptor(group_index_from_inode(index));
unsigned index_in_group = index % inodes_per_group();
unsigned group_index = group_index_from_inode(index);
auto& bgd = group_descriptor(group_index);
unsigned index_in_group = index - ((group_index - 1) * inodes_per_group());
unsigned inodes_per_bitmap_block = block_size() * 8;
unsigned bitmap_block_index = (index_in_group - 1) / inodes_per_bitmap_block;
unsigned bit_index = (index_in_group - 1) % inodes_per_bitmap_block;
@ -946,8 +947,9 @@ bool Ext2FS::get_inode_allocation_state(InodeIndex index) const
bool Ext2FS::set_inode_allocation_state(unsigned index, bool newState)
{
auto& bgd = group_descriptor(group_index_from_inode(index));
unsigned index_in_group = index % inodes_per_group();
unsigned group_index = group_index_from_inode(index);
auto& bgd = group_descriptor(group_index);
unsigned index_in_group = index - ((group_index - 1) * inodes_per_group());
unsigned inodes_per_bitmap_block = block_size() * 8;
unsigned bitmap_block_index = (index_in_group - 1) / inodes_per_bitmap_block;
unsigned bit_index = (index_in_group - 1) % inodes_per_bitmap_block;
@ -990,10 +992,12 @@ bool Ext2FS::set_block_allocation_state(GroupIndex group, BlockIndex bi, bool ne
dbgprintf("Ext2FS: set_block_allocation_state(group=%u, block=%u, state=%u)\n", group, bi, new_state);
auto& bgd = group_descriptor(group);
BlockIndex index_in_group = bi - ((group - 1) * blocks_per_group());
// Update block bitmap
unsigned blocks_per_bitmap_block = block_size() * 8;
unsigned bitmap_block_index = (bi - 1) / blocks_per_bitmap_block;
unsigned bit_index = (bi - 1) % blocks_per_bitmap_block;
unsigned bitmap_block_index = (index_in_group - 1) / blocks_per_bitmap_block;
unsigned bit_index = (index_in_group - 1) % blocks_per_bitmap_block;
auto block = read_block(bgd.bg_block_bitmap + bitmap_block_index);
ASSERT(block);
auto bitmap = Bitmap::wrap(block.pointer(), blocks_per_bitmap_block);