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Kernel/Ext2: Write superblock backups

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We don't ever read them out, but this should make fsck a lot less mad.
This commit is contained in:
kleines Filmröllchen 2023-07-18 17:38:04 +02:00 • committed by Jelle Raaijmakers
parent cc1cb72fb5
commit a0705202ea
4 changed files with 54 additions and 2 deletions
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19
Kernel/FileSystem/Ext2FS/FileSystem.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/IntegralMath.h>
#include <Kernel/Debug.h>
#include <Kernel/FileSystem/Ext2FS/FileSystem.h>
#include <Kernel/FileSystem/Ext2FS/Inode.h>
@ -30,7 +31,23 @@ ErrorOr<void> Ext2FS::flush_super_block()
MutexLocker locker(m_lock);
VERIFY((sizeof(ext2_super_block) % logical_block_size()) == 0);
auto super_block_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&m_super_block);
return raw_write_blocks(2, (sizeof(ext2_super_block) / logical_block_size()), super_block_buffer);
auto const superblock_physical_block_count = (sizeof(ext2_super_block) / logical_block_size());
// First superblock is always at offset 1024 (physical block index 2).
TRY(raw_write_blocks(2, superblock_physical_block_count, super_block_buffer));
auto is_sparse = has_flag(get_features_readonly(), FeaturesReadOnly::SparseSuperblock);
for (auto group = 1u; group < m_block_group_count; ++group) {
auto first_block_in_group = first_block_of_group(group);
// Superblock 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 superblock backup to block group {} (block {})", group, first_block_in_group);
TRY(write_blocks(first_block_in_group, 1, super_block_buffer));
}
}
return {};
}
ext2_group_desc const& Ext2FS::group_descriptor(GroupIndex group_index) const