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Kernel: Change Ext2FS to be backed by a file instead of a block device

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This ensures that we can mount image files as virtual disks without the
need of implementing gross hacks like loopback devices :)
This commit is contained in:
Liav A
2020-03-26 02:51:06 +02:00
committed by Andreas Kling
parent 2f2016f51d
commit 6b59311d4b
Notes: sideshowbarker 2024-07-19 07:59:58 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/6b59311d4bd
Pull-request: https://github.com/SerenityOS/serenity/pull/1513
Issue: https://github.com/SerenityOS/serenity/issues/1351
Reviewed-by: https://github.com/bugaevc
10 changed files with 116 additions and 90 deletions
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14
Kernel/FileSystem/Ext2FileSystem.cpp
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@@ -64,13 +64,13 @@ static u8 to_ext2_file_type(mode_t mode)
return EXT2_FT_UNKNOWN;
}
NonnullRefPtr<Ext2FS> Ext2FS::create(BlockDevice& device)
NonnullRefPtr<Ext2FS> Ext2FS::create(FileDescription& file_description)
{
return adopt(*new Ext2FS(device));
return adopt(*new Ext2FS(file_description));
}
Ext2FS::Ext2FS(BlockDevice& device)
: DiskBackedFS(device)
Ext2FS::Ext2FS(FileDescription& file_description)
: FileBackedFS(file_description)
{
}
@@ -81,7 +81,7 @@ Ext2FS::~Ext2FS()
bool Ext2FS::flush_super_block()
{
LOCKER(m_lock);
bool success = device().write_blocks(2, 1, (const u8*)&m_super_block);
bool success = write_blocks(2, 1, (const u8*)&m_super_block, nullptr, true);
ASSERT(success);
return true;
}
@@ -96,7 +96,7 @@ const ext2_group_desc& Ext2FS::group_descriptor(GroupIndex group_index) const
bool Ext2FS::initialize()
{
LOCKER(m_lock);
bool success = const_cast<BlockDevice&>(device()).read_blocks(2, 1, (u8*)&m_super_block);
bool success = read_blocks(2, 1, (u8*)&m_super_block, nullptr, true, true);
ASSERT(success);
auto& super_block = this->super_block();
@@ -534,7 +534,7 @@ void Ext2FS::flush_writes()
}
}
DiskBackedFS::flush_writes();
FileBackedFS::flush_writes();
// Uncache Inodes that are only kept alive by the index-to-inode lookup cache.
// We don't uncache Inodes that are being watched by at least one InodeWatcher.