76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
// Copyright 2020 The gVisor Authors.
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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 specific language governing permissions and
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// limitations under the License.
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#ifndef GVISOR_TEST_UTIL_FUSE_UTIL_H_
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#define GVISOR_TEST_UTIL_FUSE_UTIL_H_
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#include <linux/fuse.h>
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#include <sys/uio.h>
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#include <string>
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#include <vector>
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namespace gvisor {
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namespace testing {
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// The fundamental generation function with a single argument. If passed by
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// std::string or std::vector<char>, it will call specialized versions as
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// implemented below.
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template <typename T>
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std::vector<struct iovec> FuseGenerateIovecs(T &first) {
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return {(struct iovec){.iov_base = &first, .iov_len = sizeof(first)}};
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}
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// If an argument is of type std::string, it must be used in read-only scenario.
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// Because we are setting up iovec, which contains the original address of a
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// data structure, we have to drop const qualification. Usually used with
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// variable-length payload data.
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template <typename T = std::string>
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std::vector<struct iovec> FuseGenerateIovecs(std::string &first) {
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// Pad one byte for null-terminate c-string.
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return {(struct iovec){.iov_base = const_cast<char *>(first.c_str()),
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.iov_len = first.size() + 1}};
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}
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// If an argument is of type std::vector<char>, it must be used in write-only
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// scenario and the size of the variable must be greater than or equal to the
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// size of the expected data. Usually used with variable-length payload data.
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template <typename T = std::vector<char>>
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std::vector<struct iovec> FuseGenerateIovecs(std::vector<char> &first) {
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return {(struct iovec){.iov_base = first.data(), .iov_len = first.size()}};
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}
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// A helper function to set up an array of iovec struct for testing purpose.
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// Use variadic class template to generalize different numbers and different
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// types of FUSE structs.
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template <typename T, typename... Types>
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std::vector<struct iovec> FuseGenerateIovecs(T &first, Types &...args) {
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auto first_iovec = FuseGenerateIovecs(first);
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auto iovecs = FuseGenerateIovecs(args...);
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first_iovec.insert(std::end(first_iovec), std::begin(iovecs),
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std::end(iovecs));
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return first_iovec;
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}
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// Create a fuse_attr filled with the specified mode and inode.
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fuse_attr DefaultFuseAttr(mode_t mode, uint64_t inode, uint64_t size = 512);
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// Return a fuse_entry_out FUSE server response body.
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fuse_entry_out DefaultEntryOut(mode_t mode, uint64_t node_id,
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uint64_t size = 512);
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} // namespace testing
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} // namespace gvisor
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#endif // GVISOR_TEST_UTIL_FUSE_UTIL_H_
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