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119 lines
3.7 KiB
C++
119 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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(*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(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(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(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(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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