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133 lines
3.8 KiB
133 lines
3.8 KiB
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specic language governing permissions and
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* limitations under the License.
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*/
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#include "node-inl.h"
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static std::vector<std::string> GetPathSegments(int segment_start, const std::string& path) {
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std::vector<std::string> segments;
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int segment_end = path.find_first_of('/', segment_start);
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while (segment_end != std::string::npos) {
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if (segment_end == segment_start) {
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// First character is '/' ignore
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segment_end = path.find_first_of('/', ++segment_start);
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continue;
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}
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segments.push_back(path.substr(segment_start, segment_end - segment_start));
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segment_start = segment_end + 1;
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segment_end = path.find_first_of('/', segment_start);
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}
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if (segment_start < path.size()) {
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segments.push_back(path.substr(segment_start));
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}
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return segments;
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}
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namespace mediaprovider {
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namespace fuse {
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// Assumes that |node| has at least one child.
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void node::BuildPathForNodeRecursive(bool safe, const node* node, std::stringstream* path) const {
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if (node->parent_) {
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BuildPathForNodeRecursive(safe, node->parent_, path);
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}
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if (safe && node->parent_) {
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(*path) << reinterpret_cast<uintptr_t>(node);
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} else {
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(*path) << node->GetName();
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}
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if (node != this) {
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// Must not add a '/' to the last segment
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(*path) << "/";
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}
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}
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std::string node::BuildPath() const {
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std::lock_guard<std::recursive_mutex> guard(*lock_);
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std::stringstream path;
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BuildPathForNodeRecursive(false, this, &path);
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return path.str();
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}
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std::string node::BuildSafePath() const {
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std::lock_guard<std::recursive_mutex> guard(*lock_);
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std::stringstream path;
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BuildPathForNodeRecursive(true, this, &path);
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return path.str();
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}
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const node* node::LookupAbsolutePath(const node* root, const std::string& absolute_path) {
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if (absolute_path.find(root->GetName()) != 0) {
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return nullptr;
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}
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std::vector<std::string> segments = GetPathSegments(root->GetName().size(), absolute_path);
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std::lock_guard<std::recursive_mutex> guard(*root->lock_);
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const node* node = root;
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for (const std::string& segment : segments) {
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node = node->LookupChildByName(segment, false /* acquire */);
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if (!node) {
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return nullptr;
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}
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}
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return node;
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}
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const node* node::LookupInode(const node* root, ino_t ino) {
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CHECK(root);
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std::lock_guard<std::recursive_mutex> guard(*root->lock_);
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if ((root->ino_ == ino) && !root->deleted_ && !(root->handles_.empty())) {
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return root;
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}
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for (node* child : root->children_) {
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const node* node = LookupInode(child, ino);
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if (node) {
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return node;
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}
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}
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return nullptr;
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}
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void node::DeleteTree(node* tree) {
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std::lock_guard<std::recursive_mutex> guard(*tree->lock_);
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if (tree) {
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// Make a copy of the list of children because calling Delete tree
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// will modify the list of children, which will cause issues while
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// iterating over them.
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std::vector<node*> children(tree->children_.begin(), tree->children_.end());
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for (node* child : children) {
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DeleteTree(child);
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}
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CHECK(tree->children_.empty());
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delete tree;
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}
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}
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} // namespace fuse
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} // namespace mediaprovider
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