/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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 <semaphore.h>
}

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

using namespace testing;

class Rmdir: public FuseTest {
public:
void expect_lookup(const char *relpath, uint64_t ino, int times=1)
{
        EXPECT_LOOKUP(FUSE_ROOT_ID, relpath)
        .Times(times)
        .WillRepeatedly(Invoke(ReturnImmediate([=](auto in __unused, auto& out) {
                SET_OUT_HEADER_LEN(out, entry);
                out.body.entry.attr_valid = UINT64_MAX;
                out.body.entry.attr.mode = S_IFDIR | 0755;
                out.body.entry.nodeid = ino;
                out.body.entry.attr.nlink = 2;
        })));
}

void expect_rmdir(uint64_t parent, const char *relpath, int error)
{
        EXPECT_CALL(*m_mock, process(
                ResultOf([=](auto in) {
                        return (in.header.opcode == FUSE_RMDIR &&
                                0 == strcmp(relpath, in.body.rmdir) &&
                                in.header.nodeid == parent);
                }, Eq(true)),
                _)
        ).WillOnce(Invoke(ReturnErrno(error)));
}
};

/*
 * A successful rmdir should clear the parent directory's attribute cache,
 * because the fuse daemon should update its mtime and ctime
 */
TEST_F(Rmdir, parent_attr_cache)
{
        const char FULLPATH[] = "mountpoint/some_dir";
        const char RELPATH[] = "some_dir";
        struct stat sb;
        sem_t sem;
        uint64_t ino = 42;
        Sequence seq;

        ASSERT_EQ(0, sem_init(&sem, 0, 0)) << strerror(errno);

        expect_lookup(RELPATH, ino);
        EXPECT_CALL(*m_mock, process(
                ResultOf([=](auto in) {
                        return (in.header.opcode == FUSE_RMDIR &&
                                0 == strcmp(RELPATH, in.body.rmdir) &&
                                in.header.nodeid == FUSE_ROOT_ID);
                }, Eq(true)),
                _)
        ).InSequence(seq)
        .WillOnce(Invoke(ReturnErrno(0)));
        expect_forget(ino, 1, &sem);
        EXPECT_CALL(*m_mock, process(
                ResultOf([=](auto in) {
                        return (in.header.opcode == FUSE_GETATTR &&
                                in.header.nodeid == FUSE_ROOT_ID);
                }, Eq(true)),
                _)
        ).InSequence(seq)
        .WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
                SET_OUT_HEADER_LEN(out, attr);
                out.body.attr.attr.ino = FUSE_ROOT_ID;
                out.body.attr.attr.mode = S_IFDIR | 0755;
                out.body.attr.attr_valid = UINT64_MAX;
        })));

        ASSERT_EQ(0, rmdir(FULLPATH)) << strerror(errno);
        EXPECT_EQ(0, stat("mountpoint", &sb)) << strerror(errno);
        sem_wait(&sem);
        sem_destroy(&sem);
}

TEST_F(Rmdir, enotempty)
{
        const char FULLPATH[] = "mountpoint/some_dir";
        const char RELPATH[] = "some_dir";
        uint64_t ino = 42;

        expect_lookup(RELPATH, ino);
        expect_rmdir(FUSE_ROOT_ID, RELPATH, ENOTEMPTY);

        ASSERT_NE(0, rmdir(FULLPATH));
        ASSERT_EQ(ENOTEMPTY, errno);
}

/* Removing a directory should expire its entry cache */
TEST_F(Rmdir, entry_cache)
{
        const char FULLPATH[] = "mountpoint/some_dir";
        const char RELPATH[] = "some_dir";
        sem_t sem;
        uint64_t ino = 42;

        expect_lookup(RELPATH, ino, 2);
        expect_rmdir(FUSE_ROOT_ID, RELPATH, 0);
        expect_forget(ino, 1, &sem);

        ASSERT_EQ(0, rmdir(FULLPATH)) << strerror(errno);
        ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
        sem_wait(&sem);
        sem_destroy(&sem);
}

TEST_F(Rmdir, ok)
{
        const char FULLPATH[] = "mountpoint/some_dir";
        const char RELPATH[] = "some_dir";
        sem_t sem;
        uint64_t ino = 42;

        ASSERT_EQ(0, sem_init(&sem, 0, 0)) << strerror(errno);

        expect_lookup(RELPATH, ino);
        expect_rmdir(FUSE_ROOT_ID, RELPATH, 0);
        expect_forget(ino, 1, &sem);

        ASSERT_EQ(0, rmdir(FULLPATH)) << strerror(errno);
        sem_wait(&sem);
        sem_destroy(&sem);
}