CryDevice::BlobWithParent CryDevice::LoadBlobWithParent(const bf::path &path) {
optional<unique_ref<DirBlobRef>> parentBlob = none;
optional<unique_ref<FsBlobRef>> currentBlobOpt = _fsBlobStore->load(_rootKey);
if (currentBlobOpt == none) {
LOG(ERROR) << "Could not load root blob. Is the base directory accessible?";
throw FuseErrnoException(EIO);
}
unique_ref<FsBlobRef> currentBlob = std::move(*currentBlobOpt);
for (const bf::path &component : path.relative_path()) {
auto currentDir = dynamic_pointer_move<DirBlobRef>(currentBlob);
if (currentDir == none) {
throw FuseErrnoException(ENOTDIR); // Path component is not a dir
}
auto childOpt = (*currentDir)->GetChild(component.c_str());
if (childOpt == boost::none) {
throw FuseErrnoException(ENOENT); // Child entry in directory not found
}
Key childKey = childOpt->key();
auto nextBlob = _fsBlobStore->load(childKey);
if (nextBlob == none) {
throw FuseErrnoException(ENOENT); // Blob for directory entry not found
}
parentBlob = std::move(*currentDir);
currentBlob = std::move(*nextBlob);
}
return BlobWithParent{std::move(currentBlob), std::move(parentBlob)};
//TODO (I think this is resolved, but I should test it)
// Running the python script, waiting for "Create files in sequential order...", then going into dir ~/tmp/cryfs-mount-.../Bonnie.../ and calling "ls"
// crashes cryfs with a sigsegv.
// Possible reason: Many parallel changes to a directory blob are a race condition. Need something like ParallelAccessStore!
}
void CryNode::rename(const bf::path &to) {
device()->callFsActionCallbacks();
if (_parent == none) {
//We are the root direcory.
throw FuseErrnoException(EBUSY);
}
auto targetDirWithParent = _device->LoadDirBlobWithParent(to.parent_path());
auto targetDir = std::move(targetDirWithParent.blob);
auto targetDirParent = std::move(targetDirWithParent.parent);
auto old = (*_parent)->GetChild(_key);
if (old == boost::none) {
throw FuseErrnoException(EIO);
}
fsblobstore::DirEntry oldEntry = *old; // Copying this (instead of only keeping the reference) is necessary, because the operations below (i.e. RenameChild()) might make a reference invalid.
auto onOverwritten = [this] (const blockstore::Key &key) {
device()->RemoveBlob(key);
};
_updateParentModificationTimestamp();
if (targetDir->key() == (*_parent)->key()) {
targetDir->RenameChild(oldEntry.key(), to.filename().native(), onOverwritten);
} else {
_updateTargetDirModificationTimestamp(*targetDir, std::move(targetDirParent));
targetDir->AddOrOverwriteChild(to.filename().native(), oldEntry.key(), oldEntry.type(), oldEntry.mode(), oldEntry.uid(), oldEntry.gid(),
oldEntry.lastAccessTime(), oldEntry.lastModificationTime(), onOverwritten);
(*_parent)->RemoveChild(oldEntry.name());
// targetDir is now the new parent for this node. Adapt to it, so we can call further operations on this node object.
_parent = cpputils::to_unique_ptr(std::move(targetDir));
}
}
void CryDevice::RemoveBlob(const blockstore::Key &key) {
auto blob = _fsBlobStore->load(key);
if (blob == none) {
LOG(ERROR) << "Could not load blob " << key.ToString() << ". Is the base directory accessible?";
throw FuseErrnoException(EIO);
}
_fsBlobStore->remove(std::move(*blob));
}
unique_ref<FsBlobRef> CryDevice::LoadBlob(const blockstore::Key &key) {
auto blob = _fsBlobStore->load(key);
if (blob == none) {
LOG(ERROR) << "Could not load blob " << key.ToString() << ". Is the base directory accessible?";
throw FuseErrnoException(EIO);
}
return std::move(*blob);
}
CryDevice::DirBlobWithParent CryDevice::LoadDirBlobWithParent(const bf::path &path) {
auto blob = LoadBlobWithParent(path);
auto dir = dynamic_pointer_move<DirBlobRef>(blob.blob);
if (dir == none) {
throw FuseErrnoException(ENOTDIR); // Loaded blob is not a directory
}
return DirBlobWithParent{std::move(*dir), std::move(blob.parent)};
}
void CryNode::chown(uid_t uid, gid_t gid) {
device()->callFsActionCallbacks();
if (_parent == none) {
//We are the root direcory.
//TODO What should we do?
throw FuseErrnoException(EIO);
}
(*_parent)->chownChild(_key, uid, gid);
}
void CryNode::chmod(mode_t mode) {
device()->callFsActionCallbacks();
if (_parent == none) {
//We are the root direcory.
//TODO What should we do?
throw FuseErrnoException(EIO);
}
(*_parent)->chmodChild(_key, mode);
}
void CryNode::utimens(timespec lastAccessTime, timespec lastModificationTime) {
device()->callFsActionCallbacks();
if (_parent == none) {
//We are the root direcory.
//TODO What should we do?
throw FuseErrnoException(EIO);
}
(*_parent)->utimensChild(_key, lastAccessTime, lastModificationTime);
}
void CryNode::removeNode() {
//TODO Instead of all these if-else and having _parent being an optional, we could also introduce a CryRootDir which inherits from fspp::Dir.
if (_parent == none) {
//We are the root direcory.
//TODO What should we do?
throw FuseErrnoException(EIO);
}
(*_parent)->RemoveChild(_key);
_device->RemoveBlob(_key);
}
void CryNode::rename(const bf::path &to) {
device()->callFsActionCallbacks();
if (_parent == none) {
//We are the root direcory.
//TODO What should we do?
throw FuseErrnoException(EIO);
}
//TODO More efficient implementation possible: directly rename when it's actually not moved to a different directory
// It's also quite ugly code because in the parent==targetDir case, it depends on _parent not overriding the changes made by targetDir.
auto old = (*_parent)->GetChild(_key);
auto mode = old.mode;
auto uid = old.uid;
auto gid = old.gid;
(*_parent)->RemoveChild(_key);
(*_parent)->flush();
auto targetDir = _device->LoadDirBlob(to.parent_path());
targetDir->AddChild(to.filename().native(), _key, getType(), mode, uid, gid);
}
void CryNode::utimens(const timespec times[2]) {
device()->callFsActionCallbacks();
//TODO
throw FuseErrnoException(ENOTSUP);
}
void CryNode::access(int mask) const {
device()->callFsActionCallbacks();
//TODO
return;
throw FuseErrnoException(ENOTSUP);
}