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Kernel: Remove the big inode lock

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This moves locking to the inodes themselves which allows reducing lock
times significantly. Main inodes (ext2 and tmpfs) still do contain a
single big mutex that gets locked during operations but now we have the
architecture to optimize these.
This commit is contained in:
Bananymous
2026-05-09 21:30:05 +03:00
parent a7356716ff
commit 9f4271f6d8
31 changed files with 378 additions and 189 deletions
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124
kernel/kernel/Terminal/TTY.cpp
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@@ -6,6 +6,7 @@
#include <kernel/FS/DevFS/FileSystem.h>
#include <kernel/FS/VirtualFileSystem.h>
#include <kernel/Lock/LockGuard.h>
#include <kernel/Lock/SpinLockAsMutex.h>
#include <kernel/Process.h>
#include <kernel/Terminal/TTY.h>
#include <kernel/Timer/Timer.h>
@@ -71,8 +72,8 @@ namespace Kernel
TTY::TTY(termios termios, mode_t mode, uid_t uid, gid_t gid)
: CharacterDevice(mode, uid, gid)
, m_termios(termios)
, m_rdev(next_tty_rdev())
, m_termios(termios)
{
m_output.buffer = MUST(ByteRingBuffer::create(PAGE_SIZE));
}
@@ -94,21 +95,16 @@ namespace Kernel
if (flags & ~(TTY_FLAG_ENABLE_INPUT | TTY_FLAG_ENABLE_OUTPUT))
return BAN::Error::from_errno(EINVAL);
LockGuard _(m_mutex);
switch (command)
{
case TTY_CMD_SET:
if ((flags & TTY_FLAG_ENABLE_INPUT) && !m_tty_ctrl.receive_input)
{
if (flags & TTY_FLAG_ENABLE_INPUT)
m_tty_ctrl.receive_input = true;
m_tty_ctrl.thread_blocker.unblock();
}
if (flags & TTY_FLAG_ENABLE_OUTPUT)
m_tty_ctrl.draw_graphics = true;
break;
case TTY_CMD_UNSET:
if ((flags & TTY_FLAG_ENABLE_INPUT) && m_tty_ctrl.receive_input)
if (flags & TTY_FLAG_ENABLE_INPUT)
m_tty_ctrl.receive_input = false;
if (flags & TTY_FLAG_ENABLE_OUTPUT)
m_tty_ctrl.draw_graphics = false;
@@ -133,16 +129,8 @@ namespace Kernel
while (true)
{
{
LockGuard _(TTY::current()->m_mutex);
while (!TTY::current()->m_tty_ctrl.receive_input)
TTY::current()->m_tty_ctrl.thread_blocker.block_indefinite(&TTY::current()->m_mutex);
}
while (TTY::current()->m_tty_ctrl.receive_input)
{
LockGuard _(keyboard_inode->m_mutex);
if (!keyboard_inode->can_read())
{
SystemTimer::get().sleep_ms(1);
@@ -160,19 +148,15 @@ namespace Kernel
void TTY::initialize_devices()
{
static bool initialized = false;
ASSERT(!initialized);
auto* thread = MUST(Thread::create_kernel(&TTY::keyboard_task, nullptr));
MUST(Processor::scheduler().add_thread(thread));
DevFileSystem::get().add_inode("tty", MUST(DevTTY::create(0666, 0, 0)));
initialized = true;
}
BAN::ErrorOr<void> TTY::chmod_impl(mode_t mode)
{
// FIXME: make this atomic
ASSERT((mode & Inode::Mode::TYPE_MASK) == 0);
m_inode_info.mode &= Inode::Mode::TYPE_MASK;
m_inode_info.mode |= mode;
@@ -181,6 +165,7 @@ namespace Kernel
BAN::ErrorOr<void> TTY::chown_impl(uid_t uid, gid_t gid)
{
// FIXME: make this atomic
m_inode_info.uid = uid;
m_inode_info.gid = gid;
return {};
@@ -188,6 +173,7 @@ namespace Kernel
void TTY::update_winsize(unsigned short cols, unsigned short rows)
{
// FIXME: make this atomic
m_winsize.ws_col = cols;
m_winsize.ws_row = rows;
(void)Process::kill(-m_foreground_pgrp, SIGWINCH);
@@ -211,12 +197,14 @@ namespace Kernel
}
case TIOCGWINSZ:
{
// FIXME: make this atomic
auto* winsize = static_cast<struct winsize*>(argument);
*winsize = m_winsize;
return 0;
}
case TIOCSWINSZ:
{
// FIXME: make this atomic
const auto* winsize = static_cast<const struct winsize*>(argument);
m_winsize = *winsize;
(void)Process::kill(-m_foreground_pgrp, SIGWINCH);
@@ -226,10 +214,13 @@ namespace Kernel
return BAN::Error::from_errno(ENOTSUP);
}
void TTY::on_key_event(LibInput::RawKeyEvent event)
{
on_key_event(LibInput::KeyboardLayout::get().key_event_from_raw(event));
}
void TTY::on_key_event(LibInput::KeyEvent event)
{
LockGuard _(m_mutex);
if (event.released())
return;
@@ -237,35 +228,55 @@ namespace Kernel
if (ansi_c_str == nullptr)
return;
LockGuard _(m_mutex);
while (*ansi_c_str)
handle_input_byte(*ansi_c_str++);
after_write();
}
void TTY::get_termios(termios* termios)
{
SpinLockGuard _(m_termios_lock);
*termios = m_termios;
}
BAN::ErrorOr<void> TTY::set_termios(const termios* termios)
{
// FIXME: do some validation
SpinLockGuard _(m_termios_lock);
m_termios = *termios;
return {};
}
void TTY::handle_input_byte(uint8_t ch)
{
if (ch == _POSIX_VDISABLE)
return;
LockGuard _(m_mutex);
LockGuard _0(m_mutex);
if ((m_termios.c_iflag & ISTRIP))
termios termios;
get_termios(&termios);
if ((termios.c_iflag & ISTRIP))
ch &= 0x7F;
if ((m_termios.c_iflag & IGNCR) && ch == CR)
if ((termios.c_iflag & IGNCR) && ch == CR)
return;
if ((m_termios.c_iflag & ICRNL) && ch == CR)
if ((termios.c_iflag & ICRNL) && ch == CR)
ch = NL;
else if ((m_termios.c_iflag & INLCR) && ch == NL)
else if ((termios.c_iflag & INLCR) && ch == NL)
ch = CR;
if (m_termios.c_lflag & ISIG)
if (termios.c_lflag & ISIG)
{
int sig = -1;
if (ch == m_termios.c_cc[VINTR])
if (ch == termios.c_cc[VINTR])
sig = SIGINT;
if (ch == m_termios.c_cc[VQUIT])
if (ch == termios.c_cc[VQUIT])
sig = SIGQUIT;
if (ch == m_termios.c_cc[VSUSP])
if (ch == termios.c_cc[VSUSP])
sig = SIGTSTP;
if (sig != -1)
{
@@ -279,30 +290,30 @@ namespace Kernel
bool should_flush = false;
bool force_echo = false;
if (!(m_termios.c_lflag & ICANON))
if (!(termios.c_lflag & ICANON))
should_flush = true;
else
{
if (ch == m_termios.c_cc[VERASE] && (m_termios.c_lflag & ECHOE))
if (ch == termios.c_cc[VERASE] && (termios.c_lflag & ECHOE))
return do_backspace();
if (ch == m_termios.c_cc[VKILL] && (m_termios.c_lflag & ECHOK))
if (ch == termios.c_cc[VKILL] && (termios.c_lflag & ECHOK))
{
while (!m_output.buffer->empty() && m_output.buffer->back() != '\n')
do_backspace();
return;
}
if (ch == m_termios.c_cc[VEOF])
if (ch == termios.c_cc[VEOF])
{
should_append = false;
should_flush = true;
}
if (ch == NL || ch == CR || ch == m_termios.c_cc[VEOL])
if (ch == NL || ch == CR || ch == termios.c_cc[VEOL])
{
should_flush = true;
force_echo = !!(m_termios.c_lflag & ECHONL);
force_echo = !!(termios.c_lflag & ECHONL);
}
}
@@ -311,7 +322,7 @@ namespace Kernel
if (should_append && !m_output.buffer->full())
m_output.buffer->push({ &ch, 1 });
if (should_append && (force_echo || (m_termios.c_lflag & ECHO)))
if (should_append && (force_echo || (termios.c_lflag & ECHO)))
{
if ((ch <= 31 || ch == 127) && ch != '\n')
{
@@ -380,14 +391,18 @@ namespace Kernel
bool TTY::putchar(uint8_t ch)
{
SpinLockGuard _(m_write_lock);
if (!m_tty_ctrl.draw_graphics)
return true;
if (m_termios.c_oflag & OPOST)
termios termios;
get_termios(&termios);
SpinLockGuard _1(m_write_lock);
if (termios.c_oflag & OPOST)
{
if ((m_termios.c_oflag & ONLCR) && ch == NL)
if ((termios.c_oflag & ONLCR) && ch == NL)
return putchar_impl(CR) && putchar_impl(NL);
if ((m_termios.c_oflag & OCRNL) && ch == CR)
if ((termios.c_oflag & OCRNL) && ch == CR)
return putchar_impl(NL);
}
return putchar_impl(ch);
@@ -395,6 +410,7 @@ namespace Kernel
BAN::ErrorOr<size_t> TTY::read_impl(off_t, BAN::ByteSpan buffer)
{
LockGuard _(m_mutex);
while (!m_output.flush)
TRY(Thread::current().block_or_eintr_indefinite(m_output.thread_blocker, &m_mutex));
@@ -428,24 +444,24 @@ namespace Kernel
BAN::ErrorOr<size_t> TTY::write_impl(off_t, BAN::ConstByteSpan buffer)
{
while (!can_write_impl())
SpinLockGuard write_guard(m_write_lock);
while (!can_write())
{
if (master_has_closed())
return BAN::Error::from_errno(EIO);
TRY(Thread::current().block_or_eintr_indefinite(m_write_blocker, &m_mutex));
SpinLockGuardAsMutex smutex(write_guard);
TRY(Thread::current().block_or_eintr_indefinite(m_write_blocker, &smutex));
}
size_t written = 0;
for (; written < buffer.size(); written++)
if (!putchar(buffer[written]))
break;
after_write();
{
SpinLockGuard _(m_write_lock);
for (; written < buffer.size(); written++)
if (!putchar(buffer[written]))
break;
after_write();
}
if (can_write_impl())
if (can_write())
epoll_notify(EPOLLOUT);
return written;