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Kernel: Make device generate their own names

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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.
This commit is contained in:
Jean-Baptiste Boric 2021-01-21 18:49:56 +01:00 • committed by Andreas Kling
parent a2601e1308
commit f64e287b82
29 changed files with 76 additions and 69 deletions
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71
Kernel/FileSystem/DevFS.cpp
View file

@ -350,79 +350,12 @@ KResult DevFSDeviceInode::chown(uid_t uid, gid_t gid)
String DevFSDeviceInode::name() const
{
LOCKER(m_lock);
if (m_cached_name.is_null() || m_cached_name.is_empty())
const_cast<DevFSDeviceInode&>(*this).m_cached_name = determine_name();
const_cast<DevFSDeviceInode&>(*this).m_cached_name = m_attached_device->device_name();
return m_cached_name;
}
String DevFSDeviceInode::determine_name() const
{
LOCKER(m_lock);
if (m_attached_device->is_character_device()) {
switch (m_attached_device->major()) {
case 85:
if (m_attached_device->minor() == 1)
return "keyboard";
ASSERT_NOT_REACHED();
case 10:
if (m_attached_device->minor() == 1)
return "mouse";
ASSERT_NOT_REACHED();
case 42:
if (m_attached_device->minor() == 42)
return "audio";
ASSERT_NOT_REACHED();
case 1:
switch (m_attached_device->minor()) {
case 8:
return "random";
case 3:
return "null";
case 5:
return "zero";
case 7:
return "full";
default:
ASSERT_NOT_REACHED();
}
case 5:
if (m_attached_device->minor() == 1)
return "console";
if (m_attached_device->minor() == 2)
return "ptmx";
ASSERT_NOT_REACHED();
case 4:
if (m_attached_device->minor() >= 64)
return String::formatted("ttyS{}", m_attached_device->minor() - 64);
return String::formatted("tty{}", m_attached_device->minor());
default:
ASSERT_NOT_REACHED();
}
} else {
switch (m_attached_device->major()) {
case 29:
return String::formatted("fb{}", m_attached_device->minor());
case 3: {
size_t drive_index = (u8)'a' + m_attached_device->minor();
char drive_letter = (u8)drive_index;
return String::format("hd%c", drive_letter);
}
case 6: {
return String::formatted("ramdisk{}", m_attached_device->minor());
}
case 100:
// FIXME: Try to not hardcode a maximum of 16 partitions per drive!
size_t drive_index = (u8)'a' + (m_attached_device->minor() / 16);
char drive_letter = (u8)drive_index;
return String::formatted("hd{:c}{}", drive_letter, m_attached_device->minor() + 1);
}
}
ASSERT_NOT_REACHED();
}
ssize_t DevFSDeviceInode::read_bytes(off_t offset, ssize_t count, UserOrKernelBuffer& buffer, FileDescription* description) const
{
LOCKER(m_lock);