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-rw-r--r--src/storage/plugins/NfsStorage.cxx422
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diff --git a/src/storage/plugins/NfsStorage.cxx b/src/storage/plugins/NfsStorage.cxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "NfsStorage.hxx"
+#include "storage/StoragePlugin.hxx"
+#include "storage/StorageInterface.hxx"
+#include "storage/FileInfo.hxx"
+#include "storage/MemoryDirectoryReader.hxx"
+#include "lib/nfs/Blocking.hxx"
+#include "lib/nfs/Domain.hxx"
+#include "lib/nfs/Base.hxx"
+#include "lib/nfs/Lease.hxx"
+#include "lib/nfs/Connection.hxx"
+#include "lib/nfs/Glue.hxx"
+#include "fs/AllocatedPath.hxx"
+#include "util/Error.hxx"
+#include "thread/Mutex.hxx"
+#include "thread/Cond.hxx"
+#include "event/Loop.hxx"
+#include "event/Call.hxx"
+#include "event/DeferredMonitor.hxx"
+#include "event/TimeoutMonitor.hxx"
+
+extern "C" {
+#include <nfsc/libnfs.h>
+#include <nfsc/libnfs-raw-nfs.h>
+}
+
+#include <string>
+
+#include <assert.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+class NfsStorage final
+ : public Storage, NfsLease, DeferredMonitor, TimeoutMonitor {
+
+ enum class State {
+ INITIAL, CONNECTING, READY, DELAY,
+ };
+
+ const std::string base;
+
+ const std::string server, export_name;
+
+ NfsConnection *connection;
+
+ Mutex mutex;
+ Cond cond;
+ State state;
+ Error last_error;
+
+public:
+ NfsStorage(EventLoop &_loop, const char *_base,
+ std::string &&_server, std::string &&_export_name)
+ :DeferredMonitor(_loop), TimeoutMonitor(_loop),
+ base(_base),
+ server(std::move(_server)),
+ export_name(std::move(_export_name)),
+ state(State::INITIAL) {
+ nfs_init();
+ }
+
+ ~NfsStorage() {
+ BlockingCall(GetEventLoop(), [this](){ Disconnect(); });
+ nfs_finish();
+ }
+
+ /* virtual methods from class Storage */
+ bool GetInfo(const char *uri_utf8, bool follow, FileInfo &info,
+ Error &error) override;
+
+ StorageDirectoryReader *OpenDirectory(const char *uri_utf8,
+ Error &error) override;
+
+ std::string MapUTF8(const char *uri_utf8) const override;
+
+ const char *MapToRelativeUTF8(const char *uri_utf8) const override;
+
+ /* virtual methods from NfsLease */
+ void OnNfsConnectionReady() final {
+ assert(state == State::CONNECTING);
+
+ SetState(State::READY);
+ }
+
+ void OnNfsConnectionFailed(gcc_unused const Error &error) final {
+ assert(state == State::CONNECTING);
+
+ SetState(State::DELAY, error);
+ TimeoutMonitor::ScheduleSeconds(60);
+ }
+
+ void OnNfsConnectionDisconnected(gcc_unused const Error &error) final {
+ assert(state == State::READY);
+
+ SetState(State::DELAY, error);
+ TimeoutMonitor::ScheduleSeconds(5);
+ }
+
+ /* virtual methods from DeferredMonitor */
+ void RunDeferred() final {
+ if (state == State::INITIAL)
+ Connect();
+ }
+
+ /* virtual methods from TimeoutMonitor */
+ void OnTimeout() final {
+ assert(state == State::DELAY);
+
+ Connect();
+ }
+
+private:
+ EventLoop &GetEventLoop() {
+ return DeferredMonitor::GetEventLoop();
+ }
+
+ void SetState(State _state) {
+ assert(GetEventLoop().IsInside());
+
+ const ScopeLock protect(mutex);
+ state = _state;
+ cond.broadcast();
+ }
+
+ void SetState(State _state, const Error &error) {
+ assert(GetEventLoop().IsInside());
+
+ const ScopeLock protect(mutex);
+ state = _state;
+ last_error.Set(error);
+ cond.broadcast();
+ }
+
+ void Connect() {
+ assert(state != State::READY);
+ assert(GetEventLoop().IsInside());
+
+ connection = &nfs_get_connection(server.c_str(),
+ export_name.c_str());
+ connection->AddLease(*this);
+
+ SetState(State::CONNECTING);
+ }
+
+ void EnsureConnected() {
+ if (state != State::READY)
+ Connect();
+ }
+
+ bool WaitConnected(Error &error) {
+ const ScopeLock protect(mutex);
+
+ while (true) {
+ switch (state) {
+ case State::INITIAL:
+ /* schedule connect */
+ mutex.unlock();
+ DeferredMonitor::Schedule();
+ mutex.lock();
+ break;
+
+ case State::CONNECTING:
+ case State::READY:
+ return true;
+
+ case State::DELAY:
+ assert(last_error.IsDefined());
+ error.Set(last_error);
+ return false;
+ }
+
+ cond.wait(mutex);
+ }
+ }
+
+ void Disconnect() {
+ assert(GetEventLoop().IsInside());
+
+ switch (state) {
+ case State::INITIAL:
+ DeferredMonitor::Cancel();
+ break;
+
+ case State::CONNECTING:
+ case State::READY:
+ connection->RemoveLease(*this);
+ SetState(State::INITIAL);
+ break;
+
+ case State::DELAY:
+ TimeoutMonitor::Cancel();
+ SetState(State::INITIAL);
+ break;
+ }
+ }
+};
+
+static std::string
+UriToNfsPath(const char *_uri_utf8, Error &error)
+{
+ assert(_uri_utf8 != nullptr);
+
+ /* libnfs paths must begin with a slash */
+ std::string uri_utf8("/");
+ uri_utf8.append(_uri_utf8);
+
+ return AllocatedPath::FromUTF8(uri_utf8.c_str(), error).Steal();
+}
+
+std::string
+NfsStorage::MapUTF8(const char *uri_utf8) const
+{
+ assert(uri_utf8 != nullptr);
+
+ if (*uri_utf8 == 0)
+ return base;
+
+ return PathTraitsUTF8::Build(base.c_str(), uri_utf8);
+}
+
+const char *
+NfsStorage::MapToRelativeUTF8(const char *uri_utf8) const
+{
+ return PathTraitsUTF8::Relative(base.c_str(), uri_utf8);
+}
+
+static void
+Copy(FileInfo &info, const struct stat &st)
+{
+ if (S_ISREG(st.st_mode))
+ info.type = FileInfo::Type::REGULAR;
+ else if (S_ISDIR(st.st_mode))
+ info.type = FileInfo::Type::DIRECTORY;
+ else
+ info.type = FileInfo::Type::OTHER;
+
+ info.size = st.st_size;
+ info.mtime = st.st_mtime;
+ info.device = st.st_dev;
+ info.inode = st.st_ino;
+}
+
+class NfsGetInfoOperation final : public BlockingNfsOperation {
+ const char *const path;
+ FileInfo &info;
+
+public:
+ NfsGetInfoOperation(NfsConnection &_connection, const char *_path,
+ FileInfo &_info)
+ :BlockingNfsOperation(_connection), path(_path), info(_info) {}
+
+protected:
+ bool Start(Error &_error) override {
+ return connection.Stat(path, *this, _error);
+ }
+
+ void HandleResult(gcc_unused unsigned status, void *data) override {
+ Copy(info, *(const struct stat *)data);
+ }
+};
+
+bool
+NfsStorage::GetInfo(const char *uri_utf8, gcc_unused bool follow,
+ FileInfo &info, Error &error)
+{
+ const std::string path = UriToNfsPath(uri_utf8, error);
+ if (path.empty())
+ return false;
+
+ if (!WaitConnected(error))
+ return nullptr;
+
+ NfsGetInfoOperation operation(*connection, path.c_str(), info);
+ return operation.Run(error);
+}
+
+gcc_pure
+static bool
+SkipNameFS(const char *name)
+{
+ return name[0] == '.' &&
+ (name[1] == 0 ||
+ (name[1] == '.' && name[2] == 0));
+}
+
+static void
+Copy(FileInfo &info, const struct nfsdirent &ent)
+{
+ switch (ent.type) {
+ case NF3REG:
+ info.type = FileInfo::Type::REGULAR;
+ break;
+
+ case NF3DIR:
+ info.type = FileInfo::Type::DIRECTORY;
+ break;
+
+ default:
+ info.type = FileInfo::Type::OTHER;
+ break;
+ }
+
+ info.size = ent.size;
+ info.mtime = ent.mtime.tv_sec;
+ info.device = 0;
+ info.inode = ent.inode;
+}
+
+class NfsListDirectoryOperation final : public BlockingNfsOperation {
+ const char *const path;
+
+ MemoryStorageDirectoryReader::List entries;
+
+public:
+ NfsListDirectoryOperation(NfsConnection &_connection,
+ const char *_path)
+ :BlockingNfsOperation(_connection), path(_path) {}
+
+ StorageDirectoryReader *ToReader() {
+ return new MemoryStorageDirectoryReader(std::move(entries));
+ }
+
+protected:
+ bool Start(Error &_error) override {
+ return connection.OpenDirectory(path, *this, _error);
+ }
+
+ void HandleResult(gcc_unused unsigned status, void *data) override {
+ struct nfsdir *const dir = (struct nfsdir *)data;
+
+ CollectEntries(dir);
+ connection.CloseDirectory(dir);
+ }
+
+private:
+ void CollectEntries(struct nfsdir *dir);
+};
+
+inline void
+NfsListDirectoryOperation::CollectEntries(struct nfsdir *dir)
+{
+ assert(entries.empty());
+
+ const struct nfsdirent *ent;
+ while ((ent = connection.ReadDirectory(dir)) != nullptr) {
+ const Path name_fs = Path::FromFS(ent->name);
+ if (SkipNameFS(name_fs.c_str()))
+ continue;
+
+ std::string name_utf8 = name_fs.ToUTF8();
+ if (name_utf8.empty())
+ /* ignore files whose name cannot be converted
+ to UTF-8 */
+ continue;
+
+ entries.emplace_front(std::move(name_utf8));
+ Copy(entries.front().info, *ent);
+ }
+}
+
+StorageDirectoryReader *
+NfsStorage::OpenDirectory(const char *uri_utf8, Error &error)
+{
+ const std::string path = UriToNfsPath(uri_utf8, error);
+ if (path.empty())
+ return nullptr;
+
+ if (!WaitConnected(error))
+ return nullptr;
+
+ NfsListDirectoryOperation operation(*connection, path.c_str());
+ if (!operation.Run(error))
+ return nullptr;
+
+ return operation.ToReader();
+}
+
+static Storage *
+CreateNfsStorageURI(EventLoop &event_loop, const char *base,
+ Error &error)
+{
+ if (memcmp(base, "nfs://", 6) != 0)
+ return nullptr;
+
+ const char *p = base + 6;
+
+ const char *mount = strchr(p, '/');
+ if (mount == nullptr) {
+ error.Set(nfs_domain, "Malformed nfs:// URI");
+ return nullptr;
+ }
+
+ const std::string server(p, mount);
+
+ nfs_set_base(server.c_str(), mount);
+
+ return new NfsStorage(event_loop, base, server.c_str(), mount);
+}
+
+const StoragePlugin nfs_storage_plugin = {
+ "nfs",
+ CreateNfsStorageURI,
+};