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Kernel/Ext2: Write BGDT backups

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Same as for the superblock, let's back up the block group descriptor
table.
This commit is contained in:
kleines Filmröllchen 2023-07-18 17:50:25 +02:00 • committed by Jelle Raaijmakers
parent a0705202ea
commit 10ba54a009
1 changed files with 18 additions and 2 deletions
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20
Kernel/FileSystem/Ext2FS/FileSystem.cpp
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@ -641,8 +641,24 @@ void Ext2FS::flush_block_group_descriptor_table()
auto blocks_to_write = ceil_div(m_block_group_count * sizeof(ext2_group_desc), block_size());
auto first_block_of_bgdt = first_block_of_block_group_descriptors();
auto buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)block_group_descriptors());
if (auto result = write_blocks(first_block_of_bgdt, blocks_to_write, buffer); result.is_error())
dbgln("Ext2FS[{}]::flush_block_group_descriptor_table(): Failed to write blocks: {}", fsid(), result.error());
auto write_bgdt_to_block = [&](BlockIndex index) {
if (auto result = write_blocks(index, blocks_to_write, buffer); result.is_error())
dbgln("Ext2FS[{}]::flush_block_group_descriptor_table(): Failed to write blocks: {}", fsid(), result.error());
};
write_bgdt_to_block(first_block_of_bgdt);
auto is_sparse = has_flag(get_features_readonly(), FeaturesReadOnly::SparseSuperblock);
for (auto group = 1u; group < m_block_group_count; ++group) {
// First block is occupied by the super block
BlockIndex second_block_in_group = first_block_of_group(group).value() + 1;
// BGDT copies with sparse layout are in group number 2 and powers of 3, 5, and 7.
if (!is_sparse || group == 2 || AK::is_power_of<3>(group - 1) || AK::is_power_of<5>(group - 1) || AK::is_power_of<7>(group - 1)) {
dbgln_if(EXT2_DEBUG, "Writing block group descriptor table backup to block group {} (block {})", group, second_block_in_group);
write_bgdt_to_block(second_block_in_group);
}
}
}
void Ext2FS::flush_writes()