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Kernel: Allow again to boot with partitioned disk

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This change ensures that we don't return a zero value blindly
from DiskPartition write/read methods.

Fixes #1719.
This commit is contained in:
Liav A 2020-04-10 00:36:39 +03:00 • committed by Andreas Kling
parent 9bb4a6ecf6
commit 1570e67881
2 changed files with 31 additions and 2 deletions
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29
Kernel/Devices/DiskPartition.cpp
View file

@ -25,6 +25,7 @@
*/
#include <Kernel/Devices/DiskPartition.h>
#include <Kernel/FileSystem/FileDescription.h>
// #define OFFD_DEBUG
@ -47,6 +48,34 @@ DiskPartition::~DiskPartition()
{
}
ssize_t DiskPartition::read(FileDescription& file_description, u8* buffer, ssize_t length)
{
// FIXME: This is a hacky solution, but works fine for now...
off_t current_offset = file_description.seek(0, SEEK_CUR);
auto new_offset = current_offset + (m_block_offset * m_device->block_size());
if ((new_offset / m_device->block_size()) > m_block_limit || ((new_offset + length) / m_device->block_size()) > m_block_limit) {
return 0;
}
file_description.seek(new_offset, SEEK_SET);
auto result = m_device->read(file_description, buffer, length);
file_description.seek(current_offset, SEEK_SET);
return result;
}
ssize_t DiskPartition::write(FileDescription& file_description, const u8* buffer, ssize_t length)
{
// FIXME: This is a hacky solution, but works fine for now...
off_t current_offset = file_description.seek(0, SEEK_CUR);
auto new_offset = current_offset + (m_block_offset * m_device->block_size());
if ((new_offset / m_device->block_size()) > m_block_limit || ((new_offset + length) / m_device->block_size()) > m_block_limit) {
return 0;
}
file_description.seek(new_offset, SEEK_SET);
auto result = m_device->write(file_description, buffer, length);
file_description.seek(current_offset, SEEK_SET);
return result;
}
bool DiskPartition::read_blocks(unsigned index, u16 count, u8* out)
{
#ifdef OFFD_DEBUG

4
Kernel/Devices/DiskPartition.h
View file

@ -40,9 +40,9 @@ public:
virtual bool write_blocks(unsigned index, u16 count, const u8*) override;
// ^BlockDevice
virtual ssize_t read(FileDescription&, u8*, ssize_t) override { return 0; }
virtual ssize_t read(FileDescription&, u8*, ssize_t) override;
virtual bool can_read(const FileDescription&) const override { return true; }
virtual ssize_t write(FileDescription&, const u8*, ssize_t) override { return 0; }
virtual ssize_t write(FileDescription&, const u8*, ssize_t) override;
virtual bool can_write(const FileDescription&) const override { return true; }
private: