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// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <fcntl.h>
#include <linux/fuse.h>
#include <sys/stat.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include "gtest/gtest.h"
#include "test/fuse/linux/fuse_base.h"
#include "test/util/fs_util.h"
#include "test/util/fuse_util.h"
#include "test/util/temp_umask.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
namespace {
class CreateTest : public FuseTest {
protected:
const std::string test_file_name_ = "test_file";
const mode_t mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO;
};
TEST_F(CreateTest, CreateFile) {
const std::string test_file_path =
JoinPath(mount_point_.path().c_str(), test_file_name_);
// Ensure the file doesn't exist.
struct fuse_out_header out_header = {
.len = sizeof(struct fuse_out_header),
.error = -ENOENT,
};
auto iov_out = FuseGenerateIovecs(out_header);
SetServerResponse(FUSE_LOOKUP, iov_out);
// creat(2) is equal to open(2) with open_flags O_CREAT | O_WRONLY | O_TRUNC.
const mode_t new_mask = S_IWGRP | S_IWOTH;
const int open_flags = O_CREAT | O_WRONLY | O_TRUNC;
out_header.error = 0;
out_header.len = sizeof(struct fuse_out_header) +
sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out);
struct fuse_entry_out entry_payload = DefaultEntryOut(mode & ~new_mask, 2);
struct fuse_open_out out_payload = {
.fh = 1,
.open_flags = open_flags,
};
iov_out = FuseGenerateIovecs(out_header, entry_payload, out_payload);
SetServerResponse(FUSE_CREATE, iov_out);
// kernfs generates a successive FUSE_OPEN after the file is created. Linux's
// fuse kernel module will not send this FUSE_OPEN after creat(2).
out_header.len =
sizeof(struct fuse_out_header) + sizeof(struct fuse_open_out);
iov_out = FuseGenerateIovecs(out_header, out_payload);
SetServerResponse(FUSE_OPEN, iov_out);
int fd;
TempUmask mask(new_mask);
EXPECT_THAT(fd = creat(test_file_path.c_str(), mode), SyscallSucceeds());
EXPECT_THAT(fcntl(fd, F_GETFL),
SyscallSucceedsWithValue(open_flags & O_ACCMODE));
struct fuse_in_header in_header;
struct fuse_create_in in_payload;
std::vector<char> name(test_file_name_.size() + 1);
auto iov_in = FuseGenerateIovecs(in_header, in_payload, name);
// Skip the request of FUSE_LOOKUP.
SkipServerActualRequest();
// Get the first FUSE_CREATE.
GetServerActualRequest(iov_in);
EXPECT_EQ(in_header.len, sizeof(in_header) + sizeof(in_payload) +
test_file_name_.size() + 1);
EXPECT_EQ(in_header.opcode, FUSE_CREATE);
EXPECT_EQ(in_payload.flags, open_flags);
EXPECT_EQ(in_payload.mode, mode & ~new_mask);
EXPECT_EQ(in_payload.umask, new_mask);
EXPECT_EQ(std::string(name.data()), test_file_name_);
// Get the successive FUSE_OPEN.
struct fuse_open_in in_payload_open;
iov_in = FuseGenerateIovecs(in_header, in_payload_open);
GetServerActualRequest(iov_in);
EXPECT_EQ(in_header.len, sizeof(in_header) + sizeof(in_payload_open));
EXPECT_EQ(in_header.opcode, FUSE_OPEN);
EXPECT_EQ(in_payload_open.flags, open_flags & O_ACCMODE);
EXPECT_THAT(close(fd), SyscallSucceeds());
// Skip the FUSE_RELEASE.
SkipServerActualRequest();
}
TEST_F(CreateTest, CreateFileAlreadyExists) {
const std::string test_file_path =
JoinPath(mount_point_.path().c_str(), test_file_name_);
const int open_flags = O_CREAT | O_EXCL;
SetServerInodeLookup(test_file_name_);
EXPECT_THAT(open(test_file_path.c_str(), mode, open_flags),
SyscallFailsWithErrno(EEXIST));
}
} // namespace
} // namespace testing
} // namespace gvisor
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