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Kernel: Add STORAGE_DEVICE_GET_SIZE ioctl request

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This ioctl request makes it possible to get the size of a storage device
that has not yet been mounted.
This commit is contained in:
David Isaksson 2021-10-08 22:20:26 +02:00 • committed by Andreas Kling
parent 88eb7a634f
commit 3b089032f4
3 changed files with 20 additions and 1 deletions
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14
Kernel/Storage/StorageDevice.cpp
View file

@ -10,6 +10,7 @@
#include <Kernel/FileSystem/OpenFileDescription.h>
#include <Kernel/Storage/StorageDevice.h>
#include <Kernel/Storage/StorageManagement.h>
#include <LibC/sys/ioctl_numbers.h>
namespace Kernel {
@ -187,4 +188,17 @@ bool StorageDevice::can_write(const OpenFileDescription&, size_t offset) const
return offset < (max_addressable_block() * block_size());
}
KResult StorageDevice::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
{
switch (request) {
case STORAGE_DEVICE_GET_SIZE: {
size_t disk_size = m_max_addressable_block * block_size();
return copy_to_user(Userspace<size_t*>(arg), &disk_size);
break;
}
default:
return EINVAL;
}
}
}

3
Kernel/Storage/StorageDevice.h
View file

@ -50,6 +50,9 @@ public:
virtual CommandSet command_set() const = 0;
// ^File
virtual KResult ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) final;
protected:
StorageDevice(int, int, size_t, u64, NonnullOwnPtr<KString>);
// ^DiskDevice

4
Userland/Libraries/LibC/sys/ioctl_numbers.h
View file

@ -88,7 +88,8 @@ enum IOCtlNumber {
KCOV_ENABLE,
KCOV_DISABLE,
SOUNDCARD_IOCTL_SET_SAMPLE_RATE,
SOUNDCARD_IOCTL_GET_SAMPLE_RATE
SOUNDCARD_IOCTL_GET_SAMPLE_RATE,
STORAGE_DEVICE_GET_SIZE,
};
#define TIOCGPGRP TIOCGPGRP
@ -132,3 +133,4 @@ enum IOCtlNumber {
#define FIONREAD FIONREAD
#define SOUNDCARD_IOCTL_SET_SAMPLE_RATE SOUNDCARD_IOCTL_SET_SAMPLE_RATE
#define SOUNDCARD_IOCTL_GET_SAMPLE_RATE SOUNDCARD_IOCTL_GET_SAMPLE_RATE
#define STORAGE_DEVICE_GET_SIZE STORAGE_DEVICE_GET_SIZE