libcryfs/impl/FilesystemImpl.cpp

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#include "FilesystemImpl.h"
#include <memory>
#include <fcntl.h>
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#include "../fs_interface/Device.h"
#include "../fs_interface/Dir.h"
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#include "../fs_interface/Symlink.h"
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#include "../fuse/FuseErrnoException.h"
#include "../fs_interface/File.h"
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#include "messmer/cpp-utils/pointer.h"
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using namespace fspp;
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using cpputils::dynamic_pointer_move;
using std::unique_ptr;
using std::make_unique;
using std::vector;
using std::string;
namespace bf = boost::filesystem;
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FilesystemImpl::FilesystemImpl(Device *device)
:_device(device), _open_files() {
}
FilesystemImpl::~FilesystemImpl() {
}
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unique_ptr<File> FilesystemImpl::LoadFile(const bf::path &path) {
auto node = _device->Load(path);
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auto file = dynamic_pointer_move<File>(node);
if (!file) {
throw fuse::FuseErrnoException(EISDIR);
}
return file;
}
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unique_ptr<Dir> FilesystemImpl::LoadDir(const bf::path &path) {
auto node = _device->Load(path);
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auto dir = dynamic_pointer_move<Dir>(node);
if (!dir) {
throw fuse::FuseErrnoException(ENOTDIR);
}
return dir;
}
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unique_ptr<Symlink> FilesystemImpl::LoadSymlink(const bf::path &path) {
auto node = _device->Load(path);
auto dir = dynamic_pointer_move<Symlink>(node);
if (!dir) {
throw fuse::FuseErrnoException(ENOTDIR);
}
return dir;
}
int FilesystemImpl::openFile(const bf::path &path, int flags) {
auto file = LoadFile(path);
return openFile(*file, flags);
}
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int FilesystemImpl::openFile(const File &file, int flags) {
return _open_files.open(file.open(flags));
}
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void FilesystemImpl::flush(int descriptor) {
_open_files.get(descriptor)->flush();
}
void FilesystemImpl::closeFile(int descriptor) {
_open_files.close(descriptor);
}
void FilesystemImpl::lstat(const bf::path &path, struct ::stat *stbuf) {
_device->Load(path)->stat(stbuf);
}
void FilesystemImpl::fstat(int descriptor, struct ::stat *stbuf) {
_open_files.get(descriptor)->stat(stbuf);
}
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void FilesystemImpl::chmod(const boost::filesystem::path &path, mode_t mode) {
_device->Load(path)->chmod(mode);
}
void FilesystemImpl::chown(const boost::filesystem::path &path, uid_t uid, gid_t gid) {
_device->Load(path)->chown(uid, gid);
}
void FilesystemImpl::truncate(const bf::path &path, off_t size) {
LoadFile(path)->truncate(size);
}
void FilesystemImpl::ftruncate(int descriptor, off_t size) {
_open_files.get(descriptor)->truncate(size);
}
int FilesystemImpl::read(int descriptor, void *buf, size_t count, off_t offset) {
return _open_files.get(descriptor)->read(buf, count, offset);
}
void FilesystemImpl::write(int descriptor, const void *buf, size_t count, off_t offset) {
_open_files.get(descriptor)->write(buf, count, offset);
}
void FilesystemImpl::fsync(int descriptor) {
_open_files.get(descriptor)->fsync();
}
void FilesystemImpl::fdatasync(int descriptor) {
_open_files.get(descriptor)->fdatasync();
}
void FilesystemImpl::access(const bf::path &path, int mask) {
_device->Load(path)->access(mask);
}
int FilesystemImpl::createAndOpenFile(const bf::path &path, mode_t mode, uid_t uid, gid_t gid) {
//TODO Creating the file opens and closes it. We then reopen it afterwards.
// This is slow. Improve!
auto dir = LoadDir(path.parent_path());
auto file = dir->createAndOpenFile(path.filename().native(), mode, uid, gid);
return _open_files.open(std::move(file));
}
void FilesystemImpl::mkdir(const bf::path &path, mode_t mode, uid_t uid, gid_t gid) {
auto dir = LoadDir(path.parent_path());
dir->createDir(path.filename().native(), mode, uid, gid);
}
void FilesystemImpl::rmdir(const bf::path &path) {
auto dir = LoadDir(path);
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dir->remove();
}
void FilesystemImpl::unlink(const bf::path &path) {
auto file = LoadFile(path);
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file->remove();
}
void FilesystemImpl::rename(const bf::path &from, const bf::path &to) {
auto node = _device->Load(from);
node->rename(to);
}
unique_ptr<vector<Dir::Entry>> FilesystemImpl::readDir(const bf::path &path) {
auto dir = LoadDir(path);
return dir->children();
}
void FilesystemImpl::utimens(const bf::path &path, const timespec times[2]) {
auto node = _device->Load(path);
node->utimens(times);
}
void FilesystemImpl::statfs(const bf::path &path, struct statvfs *fsstat) {
_device->statfs(path, fsstat);
}
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void FilesystemImpl::createSymlink(const bf::path &to, const bf::path &from, uid_t uid, gid_t gid) {
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auto parent = LoadDir(from.parent_path());
parent->createSymlink(from.filename().native(), to, uid, gid);
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}
void FilesystemImpl::readSymlink(const bf::path &path, char *buf, size_t size) {
string target = LoadSymlink(path)->target().native();
std::memcpy(buf, target.c_str(), std::min(target.size()+1, size));
buf[size-1] = '\0';
}