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9861bfca01
It is sometimes frustrating to use open_file_dma, because it has the hardcoded behavior of always assuming O_CREAT. Sometimes this is not desirable, and it would be nice to have the option not to do so. Note that, by design, I am only including in the open_flags enum things that we want the user of the API to control. Stuff like O_DIRECT should not be optional, and therefore is not included in the visible interface. Because of that I am changing the function signature to include a paramater that specifies whether or not we should create the file if it does not exist. Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#include <algorithm>
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#include "core/app-template.hh"
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#include "core/future-util.hh"
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namespace bpo = boost::program_options;
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struct file_test {
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file_test(file&& f) : f(std::move(f)) {}
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file f;
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semaphore sem = { 0 };
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};
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int main(int ac, char** av) {
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app_template app;
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app.add_options()
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("dev", bpo::value<std::string>(), "e.g. --dev /dev/sdb")
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;
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return app.run(ac, av, [&app] {
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static constexpr auto max = 10000;
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auto&& config = app.configuration();
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auto filepath = config["dev"].as<std::string>();
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engine().open_file_dma(filepath, open_flags::rw | open_flags::create).then([] (file f) {
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auto ft = new file_test{std::move(f)};
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ft->f.stat().then([ft] (struct stat st) mutable {
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assert(S_ISBLK(st.st_mode));
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auto offset = 0;
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auto length = max * 4096;
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ft->f.discard(offset, length).then([ft] () mutable {
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ft->sem.signal();
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});
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});
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ft->sem.wait().then([ft] () mutable {
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return ft->f.flush();
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}).then([ft] () mutable {
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std::cout << "done\n";
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delete ft;
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engine().exit(0);
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});
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});
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});
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}
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