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Kernel: Protect Inode's list of watchers with spinlock instead of mutex

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This commit is contained in:
Andreas Kling 2022-02-03 01:39:49 +01:00
parent 210689281f
commit e0d9472ced
Notes: sideshowbarker 2024-07-17 19:50:56 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/e0d9472ced9
2 changed files with 28 additions and 27 deletions
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49
Kernel/FileSystem/Inode.cpp
View file

@ -93,9 +93,9 @@ Inode::Inode(FileSystem& fs, InodeIndex index)
Inode::~Inode()
{
for (auto& watcher : m_watchers) {
m_watchers.for_each([&](auto& watcher) {
watcher->unregister_by_inode({}, identifier());
}
});
}
void Inode::will_be_destroyed()
@ -156,17 +156,19 @@ bool Inode::unbind_socket()
ErrorOr<void> Inode::register_watcher(Badge<InodeWatcher>, InodeWatcher& watcher)
{
MutexLocker locker(m_inode_lock);
VERIFY(!m_watchers.contains(&watcher));
TRY(m_watchers.try_set(&watcher));
return m_watchers.with([&](auto& watchers) -> ErrorOr<void> {
VERIFY(!watchers.contains(&watcher));
TRY(watchers.try_set(&watcher));
return {};
});
}
void Inode::unregister_watcher(Badge<InodeWatcher>, InodeWatcher& watcher)
{
MutexLocker locker(m_inode_lock);
VERIFY(m_watchers.contains(&watcher));
m_watchers.remove(&watcher);
m_watchers.with([&](auto& watchers) {
VERIFY(watchers.contains(&watcher));
watchers.remove(&watcher);
});
}
ErrorOr<NonnullRefPtr<FIFO>> Inode::fifo()
@ -197,49 +199,43 @@ void Inode::set_metadata_dirty(bool metadata_dirty)
if (m_metadata_dirty) {
// FIXME: Maybe we should hook into modification events somewhere else, I'm not sure where.
// We don't always end up on this particular code path, for instance when writing to an ext2fs file.
for (auto& watcher : m_watchers) {
m_watchers.for_each([&](auto& watcher) {
watcher->notify_inode_event({}, identifier(), InodeWatcherEvent::Type::MetadataModified);
}
});
}
}
void Inode::did_add_child(InodeIdentifier, StringView name)
{
MutexLocker locker(m_inode_lock);
for (auto& watcher : m_watchers) {
m_watchers.for_each([&](auto& watcher) {
watcher->notify_inode_event({}, identifier(), InodeWatcherEvent::Type::ChildCreated, name);
}
});
}
void Inode::did_remove_child(InodeIdentifier, StringView name)
{
MutexLocker locker(m_inode_lock);
if (name == "." || name == "..") {
// These are just aliases and are not interesting to userspace.
return;
}
for (auto& watcher : m_watchers) {
m_watchers.for_each([&](auto& watcher) {
watcher->notify_inode_event({}, identifier(), InodeWatcherEvent::Type::ChildDeleted, name);
}
});
}
void Inode::did_modify_contents()
{
MutexLocker locker(m_inode_lock);
for (auto& watcher : m_watchers) {
m_watchers.for_each([&](auto& watcher) {
watcher->notify_inode_event({}, identifier(), InodeWatcherEvent::Type::ContentModified);
}
});
}
void Inode::did_delete_self()
{
MutexLocker locker(m_inode_lock);
for (auto& watcher : m_watchers) {
m_watchers.for_each([&](auto& watcher) {
watcher->notify_inode_event({}, identifier(), InodeWatcherEvent::Type::Deleted);
}
});
}
ErrorOr<void> Inode::prepare_to_write_data()
@ -370,4 +366,9 @@ void Inode::remove_flocks_for_description(OpenFileDescription const& description
m_flocks.remove(i--);
}
}
bool Inode::has_watchers() const
{
return !m_watchers.with([&](auto& watchers) { return watchers.is_empty(); });
}
}

4
Kernel/FileSystem/Inode.h
View file

@ -89,7 +89,7 @@ public:
static void sync_all();
void sync();
bool has_watchers() const { return !m_watchers.is_empty(); }
bool has_watchers() const;
ErrorOr<void> register_watcher(Badge<InodeWatcher>, InodeWatcher&);
void unregister_watcher(Badge<InodeWatcher>, InodeWatcher&);
@ -118,7 +118,7 @@ private:
InodeIndex m_index { 0 };
WeakPtr<Memory::SharedInodeVMObject> m_shared_vmobject;
RefPtr<LocalSocket> m_socket;
HashTable<InodeWatcher*> m_watchers;
SpinlockProtected<HashTable<InodeWatcher*>> m_watchers;
bool m_metadata_dirty { false };
RefPtr<FIFO> m_fifo;
IntrusiveListNode<Inode> m_inode_list_node;