mirror of
https://github.com/SerenityOS/serenity
synced 2024-10-16 12:52:46 +00:00
f64e287b82
Besides removing the monolithic DevFSDeviceInode::determine_name() method, being able to determine a device's name inside the /dev hierarchy outside of DevFS has its uses.
93 lines
3.2 KiB
C++
93 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2021, the SerenityOS developers
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <AK/Memory.h>
|
|
#include <AK/StringView.h>
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/Storage/RamdiskController.h>
|
|
#include <Kernel/Storage/RamdiskDevice.h>
|
|
|
|
namespace Kernel {
|
|
|
|
NonnullRefPtr<RamdiskDevice> RamdiskDevice::create(const RamdiskController& controller, OwnPtr<Region>&& region, int major, int minor)
|
|
{
|
|
return adopt(*new RamdiskDevice(controller, move(region), major, minor));
|
|
}
|
|
|
|
RamdiskDevice::RamdiskDevice(const RamdiskController& controller, OwnPtr<Region>&& region, int major, int minor)
|
|
: StorageDevice(controller, major, minor, 512, 0)
|
|
, m_region(move(region))
|
|
{
|
|
klog() << "Ramdisk: Device #" << minor << " @ " << m_region->vaddr() << " length " << m_region->size();
|
|
}
|
|
|
|
RamdiskDevice::~RamdiskDevice()
|
|
{
|
|
}
|
|
|
|
const char* RamdiskDevice::class_name() const
|
|
{
|
|
return "RamdiskDevice";
|
|
}
|
|
|
|
size_t RamdiskDevice::max_addressable_block() const
|
|
{
|
|
return m_region->size() / 512;
|
|
}
|
|
|
|
void RamdiskDevice::start_request(AsyncBlockDeviceRequest& request)
|
|
{
|
|
LOCKER(m_lock);
|
|
|
|
u8* base = m_region->vaddr().as_ptr();
|
|
size_t size = m_region->size();
|
|
u8* offset = base + request.block_index() * 512;
|
|
size_t length = request.block_count() * 512;
|
|
|
|
if ((offset + length > base + size) || (offset + length < base)) {
|
|
request.complete(AsyncDeviceRequest::Failure);
|
|
} else {
|
|
bool success;
|
|
|
|
if (request.request_type() == AsyncBlockDeviceRequest::Read) {
|
|
success = request.buffer().write(offset, length);
|
|
} else {
|
|
success = request.buffer().read(offset, length);
|
|
}
|
|
|
|
request.complete(success ? AsyncDeviceRequest::Success : AsyncDeviceRequest::MemoryFault);
|
|
}
|
|
}
|
|
|
|
String RamdiskDevice::device_name() const
|
|
{
|
|
// FIXME: Try to not hardcode a maximum of 16 partitions per drive!
|
|
size_t drive_index = minor() / 16;
|
|
return String::formatted("ramdisk{}", drive_index);
|
|
}
|
|
|
|
}
|