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9a4ea2007f
The do_op closure is complicated enough. Get the canary check out of the way to not make it even more complicated. Also, use an explicitely atomic type for the canary.
137 lines
3.6 KiB
C++
137 lines
3.6 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2007, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "internal/easylogging++.h"
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#include <utility>
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#include "Context.h"
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#include "DirNode.h"
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#include "Error.h"
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#include "Mutex.h"
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namespace encfs {
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EncFS_Context::EncFS_Context() {
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pthread_cond_init(&wakeupCond, 0);
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pthread_mutex_init(&wakeupMutex, 0);
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pthread_mutex_init(&contextMutex, 0);
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usageCount = 0;
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}
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EncFS_Context::~EncFS_Context() {
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pthread_mutex_destroy(&contextMutex);
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pthread_mutex_destroy(&wakeupMutex);
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pthread_cond_destroy(&wakeupCond);
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// release all entries from map
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openFiles.clear();
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}
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std::shared_ptr<DirNode> EncFS_Context::getRoot(int *errCode) {
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std::shared_ptr<DirNode> ret;
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do {
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{
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Lock lock(contextMutex);
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ret = root;
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++usageCount;
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}
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if (!ret) {
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int res = remountFS(this);
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if (res != 0) {
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*errCode = res;
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break;
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}
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}
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} while (!ret);
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return ret;
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}
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void EncFS_Context::setRoot(const std::shared_ptr<DirNode> &r) {
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Lock lock(contextMutex);
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root = r;
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if (r) rootCipherDir = r->rootDirectory();
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}
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bool EncFS_Context::isMounted() { return root.get() != nullptr; }
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void EncFS_Context::getAndResetUsageCounter(int *usage, int *openCount) {
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Lock lock(contextMutex);
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*usage = usageCount;
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usageCount = 0;
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*openCount = openFiles.size();
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}
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std::shared_ptr<FileNode> EncFS_Context::lookupNode(const char *path) {
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Lock lock(contextMutex);
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FileMap::iterator it = openFiles.find(std::string(path));
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if (it != openFiles.end()) {
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// all the items in the set point to the same node.. so just use the
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// first
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return it->second.front();
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}
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return std::shared_ptr<FileNode>();
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}
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void EncFS_Context::renameNode(const char *from, const char *to) {
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Lock lock(contextMutex);
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FileMap::iterator it = openFiles.find(std::string(from));
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if (it != openFiles.end()) {
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auto val = it->second;
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openFiles.erase(it);
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openFiles[std::string(to)] = val;
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}
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}
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FileNode *EncFS_Context::putNode(const char *path,
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std::shared_ptr<FileNode> &&node) {
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Lock lock(contextMutex);
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auto &list = openFiles[std::string(path)];
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list.push_front(std::move(node));
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return list.front().get();
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}
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// eraseNode is called by encfs_release in response to the RELEASE
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// FUSE-command we get from the kernel.
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void EncFS_Context::eraseNode(const char *path, FileNode *pl) {
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Lock lock(contextMutex);
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FileMap::iterator it = openFiles.find(std::string(path));
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rAssert(it != openFiles.end());
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auto fn = it->second.front();
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it->second.pop_front();
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// if no more references to this file, remove the record all together
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if (it->second.empty()) {
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fn->canary = CANARY_RELEASED;
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openFiles.erase(it);
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}
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}
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} // namespace encfs
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