mirror of
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98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Memory.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/InodeWatcher.h>
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namespace Kernel {
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NonnullRefPtr<InodeWatcher> InodeWatcher::create(Inode& inode)
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{
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return adopt_ref(*new InodeWatcher(inode));
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}
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InodeWatcher::InodeWatcher(Inode& inode)
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: m_inode(inode)
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{
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inode.register_watcher({}, *this);
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}
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InodeWatcher::~InodeWatcher()
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{
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if (auto inode = m_inode.strong_ref())
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inode->unregister_watcher({}, *this);
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}
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bool InodeWatcher::can_read(const FileDescription&, size_t) const
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{
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return !m_queue.is_empty() || !m_inode;
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}
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bool InodeWatcher::can_write(const FileDescription&, size_t) const
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{
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return true;
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}
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KResultOr<size_t> InodeWatcher::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t buffer_size)
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{
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Locker locker(m_lock);
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VERIFY(!m_queue.is_empty() || !m_inode);
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if (!m_inode)
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return 0;
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auto event = m_queue.dequeue();
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if (buffer_size < sizeof(InodeWatcherEvent))
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return buffer_size;
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size_t bytes_to_write = min(buffer_size, sizeof(event));
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ssize_t nwritten = buffer.write_buffered<sizeof(event)>(bytes_to_write, [&](u8* data, size_t data_bytes) {
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memcpy(data, &event, bytes_to_write);
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return (ssize_t)data_bytes;
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});
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if (nwritten < 0)
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return KResult((ErrnoCode)-nwritten);
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evaluate_block_conditions();
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return bytes_to_write;
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}
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KResultOr<size_t> InodeWatcher::write(FileDescription&, u64, const UserOrKernelBuffer&, size_t)
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{
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return EIO;
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}
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String InodeWatcher::absolute_path(const FileDescription&) const
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{
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if (auto inode = m_inode.strong_ref())
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return String::formatted("InodeWatcher:{}", inode->identifier().to_string());
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return "InodeWatcher:(gone)";
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}
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void InodeWatcher::notify_inode_event(Badge<Inode>, InodeWatcherEvent::Type event_type)
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{
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Locker locker(m_lock);
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m_queue.enqueue({ event_type });
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evaluate_block_conditions();
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}
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void InodeWatcher::notify_child_added(Badge<Inode>, const InodeIdentifier& child_id)
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{
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Locker locker(m_lock);
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m_queue.enqueue({ InodeWatcherEvent::Type::ChildAdded, child_id.index().value() });
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evaluate_block_conditions();
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}
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void InodeWatcher::notify_child_removed(Badge<Inode>, const InodeIdentifier& child_id)
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{
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Locker locker(m_lock);
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m_queue.enqueue({ InodeWatcherEvent::Type::ChildRemoved, child_id.index().value() });
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evaluate_block_conditions();
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}
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}
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