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Kernel/FATFS: Keep the FSInfo sector's free cluster count in sync

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implicitfield
2024-04-08 20:56:09 +03:00
committed by Tim Schumacher
parent bd76dd2dc2
commit 32692f032c
3 changed files with 27 additions and 0 deletions
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23
Kernel/FileSystem/FATFS/FileSystem.cpp
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@@ -371,6 +371,17 @@ u32 FATFS::end_of_chain_marker() const
}
}
ErrorOr<void> FATFS::set_free_cluster_count(u32 value)
{
VERIFY(m_fat_version == FATVersion::FAT32);
m_fs_info.last_known_free_cluster_count = value;
auto fs_info_buffer = UserOrKernelBuffer::for_kernel_buffer(bit_cast<u8*>(&m_fs_info));
TRY(write_block(m_parameter_block->dos7_bpb()->fs_info_sector, fs_info_buffer, sizeof(m_fs_info)));
return {};
}
ErrorOr<u32> FATFS::allocate_cluster()
{
u32 start_cluster;
@@ -393,6 +404,10 @@ ErrorOr<u32> FATFS::allocate_cluster()
for (u32 i = start_cluster; i < m_parameter_block->sector_count() / m_parameter_block->common_bpb()->sectors_per_cluster; i++) {
if (TRY(fat_read(i)) == 0) {
dbgln_if(FAT_DEBUG, "FATFS: Allocating cluster {}", i);
if (m_fat_version == FATVersion::FAT32 && m_fs_info.last_known_free_cluster_count != fs_info_data_unknown)
TRY(set_free_cluster_count(m_fs_info.last_known_free_cluster_count - 1));
TRY(fat_write(i, end_of_chain_marker()));
return i;
}
@@ -401,6 +416,14 @@ ErrorOr<u32> FATFS::allocate_cluster()
return Error::from_errno(ENOSPC);
}
ErrorOr<void> FATFS::notify_cluster_freed()
{
if (m_fat_version == FATVersion::FAT32 && m_fs_info.last_known_free_cluster_count != fs_info_data_unknown)
TRY(set_free_cluster_count(m_fs_info.last_known_free_cluster_count + 1));
return {};
}
ErrorOr<u32> FATFS::fat_read(u32 cluster)
{
dbgln_if(FAT_DEBUG, "FATFS: Reading FAT entry for cluster {}", cluster);