xref: /freebsd/tests/sys/fs/fusefs/create.cc (revision ede571e40a114351f3c3cd5540f4d9f8596863f6)

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2019 The FreeBSD Foundation
 *
 * This software was developed by BFF Storage Systems, LLC under sponsorship
 * from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

extern "C" {
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/un.h>
}

#include "mockfs.hh"
#include "utils.hh"

using namespace testing;

class Create: public FuseTest {
public:

void expect_create(const char *relpath, mode_t mode, ProcessMockerT r)
{
	EXPECT_CALL(*m_mock, process(
		ResultOf([=](auto in) {
			const char *name = (const char*)in->body.bytes +
				sizeof(fuse_open_in);
			return (in->header.opcode == FUSE_CREATE &&
				in->body.open.mode == mode &&
				(0 == strcmp(relpath, name)));
		}, Eq(true)),
		_)
	).WillOnce(Invoke(r));
}

};

/*
 * If FUSE_CREATE sets the attr_valid, then subsequent GETATTRs should use the
 * attribute cache
 */
TEST_F(Create, attr_cache)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;
	uint64_t ino = 42;
	int fd;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode,
		ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, create);
		out->body.create.entry.attr.mode = mode;
		out->body.create.entry.nodeid = ino;
		out->body.create.entry.entry_valid = UINT64_MAX;
		out->body.create.entry.attr_valid = UINT64_MAX;
	}));

	EXPECT_CALL(*m_mock, process(
		ResultOf([=](auto in) {
			return (in->header.opcode == FUSE_GETATTR &&
				in->header.nodeid == ino);
		}, Eq(true)),
		_)
	).Times(0);

	fd = open(FULLPATH, O_CREAT | O_EXCL, mode);
	EXPECT_LE(0, fd) << strerror(errno);
	/* Deliberately leak fd.  close(2) will be tested in release.cc */
}

/*
 * The fuse daemon fails the request with EEXIST.  This usually indicates a
 * race condition: some other FUSE client created the file in between when the
 * kernel checked for it with lookup and tried to create it with create
 */
TEST_F(Create, eexist)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode, ReturnErrno(EEXIST));
	EXPECT_NE(0, open(FULLPATH, O_CREAT | O_EXCL, mode));
	EXPECT_EQ(EEXIST, errno);
}

/*
 * If the daemon doesn't implement FUSE_CREATE, then the kernel should fallback
 * to FUSE_MKNOD/FUSE_OPEN
 */
TEST_F(Create, Enosys)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;
	uint64_t ino = 42;
	int fd;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode, ReturnErrno(ENOSYS));

	EXPECT_CALL(*m_mock, process(
		ResultOf([=](auto in) {
			const char *name = (const char*)in->body.bytes +
				sizeof(fuse_mknod_in);
			return (in->header.opcode == FUSE_MKNOD &&
				in->body.mknod.mode == (S_IFREG | mode) &&
				in->body.mknod.rdev == 0 &&
				(0 == strcmp(RELPATH, name)));
		}, Eq(true)),
		_)
	).WillOnce(Invoke(ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, entry);
		out->body.entry.attr.mode = mode;
		out->body.entry.nodeid = ino;
		out->body.entry.entry_valid = UINT64_MAX;
		out->body.entry.attr_valid = UINT64_MAX;
	})));

	EXPECT_CALL(*m_mock, process(
		ResultOf([=](auto in) {
			return (in->header.opcode == FUSE_OPEN &&
				in->header.nodeid == ino);
		}, Eq(true)),
		_)
	).WillOnce(Invoke(ReturnImmediate([](auto in __unused, auto out) {
		out->header.len = sizeof(out->header);
		SET_OUT_HEADER_LEN(out, open);
	})));

	fd = open(FULLPATH, O_CREAT | O_EXCL, mode);
	EXPECT_LE(0, fd) << strerror(errno);
	/* Deliberately leak fd.  close(2) will be tested in release.cc */
}

/*
 * Creating a new file after FUSE_LOOKUP returned a negative cache entry
 */
TEST_F(Create, entry_cache_negative)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;
	uint64_t ino = 42;
	int fd;
	/*
	 * Set entry_valid = 0 because this test isn't concerned with whether
	 * or not we actually cache negative entries, only with whether we
	 * interpret negative cache responses correctly.
	 */
	struct timespec entry_valid = {.tv_sec = 0, .tv_nsec = 0};

	/* create will first do a LOOKUP, adding a negative cache entry */
	EXPECT_LOOKUP(1, RELPATH).WillOnce(ReturnNegativeCache(&entry_valid));
	expect_create(RELPATH, mode,
		ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, create);
		out->body.create.entry.attr.mode = mode;
		out->body.create.entry.nodeid = ino;
		out->body.create.entry.entry_valid = UINT64_MAX;
		out->body.create.entry.attr_valid = UINT64_MAX;
	}));

	fd = open(FULLPATH, O_CREAT | O_EXCL, mode);
	ASSERT_LE(0, fd) << strerror(errno);
	/* Deliberately leak fd.  close(2) will be tested in release.cc */
}

/*
 * Creating a new file should purge any negative namecache entries
 */
TEST_F(Create, entry_cache_negative_purge)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;
	uint64_t ino = 42;
	int fd;
	struct timespec entry_valid = {.tv_sec = TIME_T_MAX, .tv_nsec = 0};

	/* create will first do a LOOKUP, adding a negative cache entry */
	EXPECT_LOOKUP(1, RELPATH).Times(1)
	.WillOnce(Invoke(ReturnNegativeCache(&entry_valid)))
	.RetiresOnSaturation();

	/* Then the CREATE should purge the negative cache entry */
	expect_create(RELPATH, mode,
		ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, create);
		out->body.create.entry.attr.mode = mode;
		out->body.create.entry.nodeid = ino;
		out->body.create.entry.attr_valid = UINT64_MAX;
	}));

	fd = open(FULLPATH, O_CREAT | O_EXCL, mode);
	ASSERT_LE(0, fd) << strerror(errno);

	/* Finally, a subsequent lookup should query the daemon */
	expect_lookup(RELPATH, ino, S_IFREG | mode, 0, 1);

	ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
	/* Deliberately leak fd.  close(2) will be tested in release.cc */
}

/*
 * The daemon is responsible for checking file permissions (unless the
 * default_permissions mount option was used)
 */
TEST_F(Create, eperm)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode, ReturnErrno(EPERM));

	EXPECT_NE(0, open(FULLPATH, O_CREAT | O_EXCL, mode));
	EXPECT_EQ(EPERM, errno);
}

TEST_F(Create, ok)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0755;
	uint64_t ino = 42;
	int fd;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode,
		ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, create);
		out->body.create.entry.attr.mode = mode;
		out->body.create.entry.nodeid = ino;
		out->body.create.entry.entry_valid = UINT64_MAX;
		out->body.create.entry.attr_valid = UINT64_MAX;
	}));

	fd = open(FULLPATH, O_CREAT | O_EXCL, mode);
	EXPECT_LE(0, fd) << strerror(errno);
	/* Deliberately leak fd.  close(2) will be tested in release.cc */
}

/* Create a unix-domain socket */
TEST_F(Create, socket)
{
	const char FULLPATH[] = "mountpoint/some_sock";
	const char RELPATH[] = "some_sock";
	mode_t mode = S_IFSOCK | 0755;
	struct sockaddr_un sa;
	uint64_t ino = 42;
	int fd;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode,
		ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, create);
		out->body.create.entry.attr.mode = mode;
		out->body.create.entry.nodeid = ino;
		out->body.create.entry.entry_valid = UINT64_MAX;
		out->body.create.entry.attr_valid = UINT64_MAX;
	}));

	fd = socket(AF_UNIX, SOCK_STREAM, 0);
	ASSERT_LE(0, fd) << strerror(errno);
	sa.sun_family = AF_UNIX;
	strlcpy(sa.sun_path, FULLPATH, sizeof(sa.sun_path));
	ASSERT_EQ(0, bind(fd, (struct sockaddr*)&sa, sizeof(sa)))
		<< strerror(errno);
}

/*
 * A regression test for a bug that affected old FUSE implementations:
 * open(..., O_WRONLY | O_CREAT, 0444) should work despite the seeming
 * contradiction between O_WRONLY and 0444
 *
 * For example:
 * https://bugs.launchpad.net/ubuntu/+source/sshfs-fuse/+bug/44886
 */
TEST_F(Create, wronly_0444)
{
	const char FULLPATH[] = "mountpoint/some_file.txt";
	const char RELPATH[] = "some_file.txt";
	mode_t mode = S_IFREG | 0444;
	uint64_t ino = 42;
	int fd;

	EXPECT_LOOKUP(1, RELPATH).WillOnce(Invoke(ReturnErrno(ENOENT)));
	expect_create(RELPATH, mode,
		ReturnImmediate([=](auto in __unused, auto out) {
		SET_OUT_HEADER_LEN(out, create);
		out->body.create.entry.attr.mode = mode;
		out->body.create.entry.nodeid = ino;
		out->body.create.entry.entry_valid = UINT64_MAX;
		out->body.create.entry.attr_valid = UINT64_MAX;
	}));

	fd = open(FULLPATH, O_CREAT | O_WRONLY, mode);
	EXPECT_LE(0, fd) << strerror(errno);
	/* Deliberately leak fd.  close(2) will be tested in release.cc */
}