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Kernel: Make Inode::register_watcher() OOM-fallible

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This commit is contained in:
Idan Horowitz 2022-01-25 15:13:59 +02:00
parent 87bd930e7e
commit a9cd8ca841
3 changed files with 14 additions and 7 deletions
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5
Kernel/FileSystem/Inode.cpp
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@ -154,11 +154,12 @@ bool Inode::unbind_socket()
return true;
}
void Inode::register_watcher(Badge<InodeWatcher>, InodeWatcher& watcher)
ErrorOr<void> Inode::register_watcher(Badge<InodeWatcher>, InodeWatcher& watcher)
{
MutexLocker locker(m_inode_lock);
VERIFY(!m_watchers.contains(&watcher));
m_watchers.set(&watcher);
TRY(m_watchers.try_set(&watcher));
return {};
}
void Inode::unregister_watcher(Badge<InodeWatcher>, InodeWatcher& watcher)

2
Kernel/FileSystem/Inode.h
View file

@ -91,7 +91,7 @@ public:
bool has_watchers() const { return !m_watchers.is_empty(); }
void register_watcher(Badge<InodeWatcher>, InodeWatcher&);
ErrorOr<void> register_watcher(Badge<InodeWatcher>, InodeWatcher&);
void unregister_watcher(Badge<InodeWatcher>, InodeWatcher&);
ErrorOr<NonnullRefPtr<FIFO>> fifo();

14
Kernel/FileSystem/InodeWatcher.cpp
View file

@ -124,13 +124,19 @@ ErrorOr<int> InodeWatcher::register_inode(Inode& inode, unsigned event_mask)
auto description = TRY(WatchDescription::create(wd, inode, event_mask));
TRY(m_inode_to_watches.try_set(inode.identifier(), description.ptr()));
auto result = m_wd_to_watches.try_set(wd, move(description));
if (result.is_error()) {
auto set_result = m_wd_to_watches.try_set(wd, move(description));
if (set_result.is_error()) {
m_inode_to_watches.remove(inode.identifier());
return result.release_error();
return set_result.release_error();
}
auto register_result = inode.register_watcher({}, *this);
if (register_result.is_error()) {
m_inode_to_watches.remove(inode.identifier());
m_wd_to_watches.remove(wd);
return register_result.release_error();
}
inode.register_watcher({}, *this);
return wd;
}