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#include "SyntheticFileSystem.h"
#include "FileDescriptor.h"
#include <AK/StdLib.h>
#ifndef SERENITY
typedef int InterruptDisabler;
#define ASSERT_INTERRUPTS_DISABLED()
#endif
//#define SYNTHFS_DEBUG
RetainPtr<SyntheticFileSystem> SyntheticFileSystem::create()
{
return adopt(*new SyntheticFileSystem);
}
SyntheticFileSystem::SyntheticFileSystem()
{
}
SyntheticFileSystem::~SyntheticFileSystem()
{
}
bool SyntheticFileSystem::initialize()
{
// Add a File for the root directory.
// FIXME: This needs work.
auto rootDir = make<File>();
rootDir->metadata.inode = { id(), RootInodeIndex };
rootDir->parent = { id(), RootInodeIndex };
rootDir->metadata.mode = 0040555;
rootDir->metadata.uid = 0;
rootDir->metadata.gid = 0;
rootDir->metadata.size = 0;
rootDir->metadata.mtime = mepoch;
m_inodes.set(RootInodeIndex, move(rootDir));
#ifndef SERENITY
addFile(createTextFile("file", String("I'm a synthetic file!\n").toByteBuffer(), 0100644));
addFile(createTextFile("message", String("Hey! This isn't my bottle!\n").toByteBuffer(), 0100644));
addFile(createGeneratedFile("lunk", [] { return String("/home/andreas/file1").toByteBuffer(); }, 00120777));
#endif
return true;
}
auto SyntheticFileSystem::createDirectory(String&& name) -> OwnPtr<File>
{
auto file = make<File>();
file->name = move(name);
file->metadata.size = 0;
file->metadata.uid = 0;
file->metadata.gid = 0;
file->metadata.mode = 0040555;
file->metadata.mtime = mepoch;
return file;
}
auto SyntheticFileSystem::createTextFile(String&& name, ByteBuffer&& contents, Unix::mode_t mode) -> OwnPtr<File>
{
auto file = make<File>();
file->data = contents;
file->name = move(name);
file->metadata.size = file->data.size();
file->metadata.uid = 100;
file->metadata.gid = 200;
file->metadata.mode = mode;
file->metadata.mtime = mepoch;
return file;
}
auto SyntheticFileSystem::createGeneratedFile(String&& name, Function<ByteBuffer()>&& generator, Unix::mode_t mode) -> OwnPtr<File>
{
auto file = make<File>();
file->generator = move(generator);
file->name = move(name);
file->metadata.size = 0;
file->metadata.uid = 0;
file->metadata.gid = 0;
file->metadata.mode = mode;
file->metadata.mtime = mepoch;
return file;
}
InodeIdentifier SyntheticFileSystem::addFile(OwnPtr<File>&& file, InodeIndex parent)
{
ASSERT_INTERRUPTS_DISABLED();
ASSERT(file);
auto it = m_inodes.find(parent);
ASSERT(it != m_inodes.end());
InodeIdentifier newInode { id(), generateInodeIndex() };
file->metadata.inode = newInode;
file->parent = { id(), parent };
(*it).value->children.append(file.ptr());
m_inodes.set(newInode.index(), move(file));
return newInode;
}
bool SyntheticFileSystem::removeFile(InodeIndex inode)
{
ASSERT_INTERRUPTS_DISABLED();
auto it = m_inodes.find(inode);
if (it == m_inodes.end())
return false;
auto& file = *(*it).value;
auto pit = m_inodes.find(file.parent.index());
if (pit == m_inodes.end())
return false;
auto& parent = *(*pit).value;
for (size_t i = 0; i < parent.children.size(); ++i) {
if (parent.children[i]->metadata.inode.index() != inode) {
continue;
}
parent.children.remove(i);
break;
}
for (auto& child : file.children)
removeFile(child->metadata.inode.index());
m_inodes.remove(inode);
return true;
}
const char* SyntheticFileSystem::className() const
{
return "synthfs";
}
InodeIdentifier SyntheticFileSystem::rootInode() const
{
return { id(), 1 };
}
bool SyntheticFileSystem::enumerateDirectoryInode(InodeIdentifier inode, Function<bool(const DirectoryEntry&)> callback) const
{
InterruptDisabler disabler;
ASSERT(inode.fileSystemID() == id());
#ifdef SYNTHFS_DEBUG
kprintf("synthfs: enumerateDirectoryInode %u\n", inode.index());
#endif
auto it = m_inodes.find(inode.index());
if (it == m_inodes.end())
return false;
const File& synInode = *(*it).value;
if (!synInode.metadata.isDirectory())
return false;
callback({ ".", 1, synInode.metadata.inode, 2 });
callback({ "..", 2, synInode.parent, 2 });
for (auto& child : synInode.children)
callback({ child->name.characters(), child->name.length(), child->metadata.inode, child->metadata.isDirectory() ? (byte)2 : (byte)1 });
return true;
}
InodeMetadata SyntheticFileSystem::inodeMetadata(InodeIdentifier inode) const
{
InterruptDisabler disabler;
ASSERT(inode.fileSystemID() == id());
#ifdef SYNTHFS_DEBUG
kprintf("synthfs: inodeMetadata(%u)\n", inode.index());
#endif
auto it = m_inodes.find(inode.index());
if (it == m_inodes.end())
return { };
return (*it).value->metadata;
}
bool SyntheticFileSystem::setModificationTime(InodeIdentifier, dword timestamp)
{
(void) timestamp;
kprintf("FIXME: Implement SyntheticFileSystem::setModificationTime().\n");
return false;
}
InodeIdentifier SyntheticFileSystem::createInode(InodeIdentifier parentInode, const String& name, Unix::mode_t mode, unsigned size)
{
(void) parentInode;
(void) name;
(void) mode;
(void) size;
kprintf("FIXME: Implement SyntheticFileSystem::createDirectoryInode().\n");
return { };
}
bool SyntheticFileSystem::writeInode(InodeIdentifier, const ByteBuffer&)
{
kprintf("FIXME: Implement SyntheticFileSystem::writeInode().\n");
return false;
}
Unix::ssize_t SyntheticFileSystem::readInodeBytes(InodeIdentifier inode, Unix::off_t offset, Unix::size_t count, byte* buffer, FileDescriptor* handle) const
{
ASSERT(inode.fileSystemID() == id());
#ifdef SYNTHFS_DEBUG
kprintf("synthfs: readInode %u\n", inode.index());
#endif
ASSERT(offset >= 0);
ASSERT(buffer);
const File* found_file;
{
InterruptDisabler disabler;
auto it = m_inodes.find(inode.index());
if (it == m_inodes.end())
return false;
found_file = (*it).value.ptr();
}
const File& file = *found_file;
ByteBuffer generatedData;
if (file.generator) {
if (!handle) {
generatedData = file.generator();
} else {
if (!handle->generatorCache())
handle->generatorCache() = file.generator();
generatedData = handle->generatorCache();
}
}
auto* data = generatedData ? &generatedData : &file.data;
Unix::ssize_t nread = min(static_cast<Unix::off_t>(data->size() - offset), static_cast<Unix::off_t>(count));
memcpy(buffer, data->pointer() + offset, nread);
if (nread == 0 && handle && handle->generatorCache())
handle->generatorCache().clear();
return nread;
}
InodeIdentifier SyntheticFileSystem::makeDirectory(InodeIdentifier parentInode, const String& name, Unix::mode_t)
{
(void) parentInode;
(void) name;
kprintf("FIXME: Implement SyntheticFileSystem::makeDirectory().\n");
return { };
}
auto SyntheticFileSystem::generateInodeIndex() -> InodeIndex
{
return m_nextInodeIndex++;
}
InodeIdentifier SyntheticFileSystem::findParentOfInode(InodeIdentifier inode) const
{
auto it = m_inodes.find(inode.index());
if (it == m_inodes.end())
return { };
return (*it).value->parent;
}
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