mirror of
https://github.com/SerenityOS/serenity
synced 2026-05-09 16:42:10 +02:00
3edc6ae0d6
Do this by: - Removing more instances of `LockRefPtr` and `NonnullLockRefPtr`. - Using better names of construction methods (i.e. `create` instead of `try_create`). - Only returning `NonnullRefPtr` on the `Device::try_create_device` method. - Removing a version of the `Device::try_create_device` method that called `DeviceType::try_create(forward<Args>(args)...)`, which was only used in a construction point in a VirtIO driver which now doesn't need this anymore.
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/*
|
|
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/API/Ioctl.h>
|
|
#include <Kernel/API/MajorNumberAllocation.h>
|
|
#include <Kernel/Devices/Device.h>
|
|
#include <Kernel/Devices/Generic/DeviceControlDevice.h>
|
|
#include <Kernel/Devices/Loop/LoopDevice.h>
|
|
#include <Kernel/Library/StdLib.h>
|
|
|
|
namespace Kernel {
|
|
|
|
UNMAP_AFTER_INIT NonnullRefPtr<DeviceControlDevice> DeviceControlDevice::must_create()
|
|
{
|
|
return MUST(Device::try_create_device<DeviceControlDevice>());
|
|
}
|
|
|
|
bool DeviceControlDevice::can_read(OpenFileDescription const&, u64) const
|
|
{
|
|
return Device::event_queue().with([](auto& queue) -> bool {
|
|
return !queue.is_empty();
|
|
});
|
|
}
|
|
|
|
UNMAP_AFTER_INIT DeviceControlDevice::DeviceControlDevice()
|
|
: CharacterDevice(MajorAllocation::CharacterDeviceFamily::DeviceControl, 10)
|
|
{
|
|
}
|
|
|
|
UNMAP_AFTER_INIT DeviceControlDevice::~DeviceControlDevice() = default;
|
|
|
|
ErrorOr<size_t> DeviceControlDevice::read(OpenFileDescription&, u64 offset, UserOrKernelBuffer& buffer, size_t size)
|
|
{
|
|
if (offset != 0)
|
|
return Error::from_errno(EINVAL);
|
|
if ((size % sizeof(DeviceEvent)) != 0)
|
|
return Error::from_errno(EOVERFLOW);
|
|
|
|
return Device::event_queue().with([&](auto& queue) -> ErrorOr<size_t> {
|
|
size_t nread = 0;
|
|
for (size_t event_index = 0; event_index < (size / sizeof(DeviceEvent)); event_index++) {
|
|
if (queue.is_empty())
|
|
break;
|
|
auto event = queue.dequeue();
|
|
TRY(buffer.write(&event, nread, sizeof(DeviceEvent)));
|
|
nread += sizeof(DeviceEvent);
|
|
}
|
|
return nread;
|
|
});
|
|
}
|
|
|
|
ErrorOr<void> DeviceControlDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
|
|
{
|
|
switch (request) {
|
|
case DEVCTL_CREATE_LOOP_DEVICE: {
|
|
unsigned fd { 0 };
|
|
TRY(copy_from_user(&fd, static_ptr_cast<unsigned*>(arg)));
|
|
auto file_description = TRY(Process::current().open_file_description(fd));
|
|
auto device = TRY(LoopDevice::create_with_file_description(file_description));
|
|
unsigned index = device->index();
|
|
return copy_to_user(static_ptr_cast<unsigned*>(arg), &index);
|
|
}
|
|
case DEVCTL_DESTROY_LOOP_DEVICE: {
|
|
unsigned index { 0 };
|
|
TRY(copy_from_user(&index, static_ptr_cast<unsigned*>(arg)));
|
|
return LoopDevice::all_instances().with([index](auto& list) -> ErrorOr<void> {
|
|
for (auto& device : list) {
|
|
if (device.index() == index) {
|
|
device.remove({});
|
|
return {};
|
|
}
|
|
}
|
|
return Error::from_errno(ENODEV);
|
|
});
|
|
}
|
|
default:
|
|
return Error::from_errno(EINVAL);
|
|
};
|
|
}
|
|
|
|
}
|