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Kernel: Add proper locking to SynthFS and stop disabling interrupts.

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This commit is contained in:
Andreas Kling 2019-02-07 10:47:11 +01:00
parent b5e5541cbc
commit 4df92709c8
Notes: sideshowbarker 2024-07-19 15:50:23 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/4df92709c80
3 changed files with 12 additions and 4 deletions
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2
Kernel/DevPtsFS.cpp
View file

@ -59,13 +59,11 @@ RetainPtr<SynthFSInode> DevPtsFS::create_slave_pty_device_file(unsigned index)
void DevPtsFS::register_slave_pty(SlavePTY& slave_pty)
{
InterruptDisabler disabler;
auto inode_id = add_file(create_slave_pty_device_file(slave_pty.index()));
slave_pty.set_devpts_inode_id(inode_id);
}
void DevPtsFS::unregister_slave_pty(SlavePTY& slave_pty)
{
InterruptDisabler disabler;
remove_file(slave_pty.devpts_inode_id().index());
}

13
Kernel/SyntheticFileSystem.cpp
View file

@ -87,7 +87,7 @@ RetainPtr<SynthFSInode> SynthFS::create_generated_file(String&& name, Function<B
InodeIdentifier SynthFS::add_file(RetainPtr<SynthFSInode>&& file, InodeIndex parent)
{
ASSERT_INTERRUPTS_DISABLED();
LOCKER(m_lock);
ASSERT(file);
auto it = m_inodes.find(parent);
ASSERT(it != m_inodes.end());
@ -101,7 +101,7 @@ InodeIdentifier SynthFS::add_file(RetainPtr<SynthFSInode>&& file, InodeIndex par
bool SynthFS::remove_file(InodeIndex inode)
{
ASSERT_INTERRUPTS_DISABLED();
LOCKER(m_lock);
auto it = m_inodes.find(inode);
if (it == m_inodes.end())
return false;
@ -158,16 +158,19 @@ RetainPtr<Inode> SynthFS::create_directory(InodeIdentifier, const String&, mode_
auto SynthFS::generate_inode_index() -> InodeIndex
{
LOCKER(m_lock);
return m_next_inode_index++;
}
RetainPtr<Inode> SynthFSInode::parent() const
{
LOCKER(m_lock);
return fs().get_inode(m_parent);
}
RetainPtr<Inode> SynthFS::get_inode(InodeIdentifier inode) const
{
LOCKER(m_lock);
auto it = m_inodes.find(inode.index());
if (it == m_inodes.end())
return { };
@ -191,6 +194,7 @@ InodeMetadata SynthFSInode::metadata() const
ssize_t SynthFSInode::read_bytes(off_t offset, size_t count, byte* buffer, FileDescriptor* descriptor) const
{
LOCKER(m_lock);
#ifdef SYNTHFS_DEBUG
kprintf("SynthFS: read_bytes %u\n", index());
#endif
@ -218,6 +222,7 @@ ssize_t SynthFSInode::read_bytes(off_t offset, size_t count, byte* buffer, FileD
bool SynthFSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntry&)> callback) const
{
LOCKER(m_lock);
#ifdef SYNTHFS_DEBUG
kprintf("SynthFS: traverse_as_directory %u\n", index());
#endif
@ -235,6 +240,7 @@ bool SynthFSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntry&
InodeIdentifier SynthFSInode::lookup(const String& name)
{
LOCKER(m_lock);
ASSERT(is_directory());
if (name == ".")
return identifier();
@ -249,6 +255,7 @@ InodeIdentifier SynthFSInode::lookup(const String& name)
String SynthFSInode::reverse_lookup(InodeIdentifier child_id)
{
LOCKER(m_lock);
ASSERT(is_directory());
for (auto& child : m_children) {
if (child->identifier() == child_id)
@ -263,6 +270,7 @@ void SynthFSInode::flush_metadata()
ssize_t SynthFSInode::write_bytes(off_t offset, size_t size, const byte* buffer, FileDescriptor*)
{
LOCKER(m_lock);
if (!m_write_callback)
return -EPERM;
// FIXME: Being able to write into SynthFS at a non-zero offset seems like something we should support..
@ -296,6 +304,7 @@ SynthFSInodeCustomData::~SynthFSInodeCustomData()
size_t SynthFSInode::directory_entry_count() const
{
LOCKER(m_lock);
ASSERT(is_directory());
// NOTE: The 2 is for '.' and '..'
return m_children.size() + 2;

1
Kernel/SyntheticFileSystem.h
View file

@ -37,6 +37,7 @@ protected:
private:
InodeIndex m_next_inode_index { 2 };
HashMap<InodeIndex, RetainPtr<SynthFSInode>> m_inodes;
mutable Lock m_lock;
};
struct SynthFSInodeCustomData {