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fusefs: add some explicit tests for FUSE_FORGET

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Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Alan Somers 2019-06-06 16:29:08 +00:00
parent 0269ae4c19
commit 2d6bf515df
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/fuse2/; revision=348750
5 changed files with 165 additions and 7 deletions
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1
tests/sys/fs/fusefs/Makefile
View File

@ -16,6 +16,7 @@ GTESTS+= destroy
GTESTS+= dev_fuse_poll
GTESTS+= fifo
GTESTS+= flush
GTESTS+= forget
GTESTS+= fsync
GTESTS+= fsyncdir
GTESTS+= getattr

4
tests/sys/fs/fusefs/destroy.cc
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@ -37,9 +37,7 @@ class Destroy: public FuseTest {};
/*
* On unmount the kernel should send a FUSE_DESTROY operation. It should also
* send FUSE_FORGET operations for all inodes with lookup_count > 0. It's hard
* to trigger FUSE_FORGET in any way except by unmounting, so this is the only
* testing that FUSE_FORGET gets.
* send FUSE_FORGET operations for all inodes with lookup_count > 0.
*/
TEST_F(Destroy, ok)
{

153
tests/sys/fs/fusefs/forget.cc Normal file
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@ -0,0 +1,153 @@
/*-
* 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 <sys/types.h>
#include <sys/sysctl.h>
#include <fcntl.h>
#include <semaphore.h>
#include <unistd.h>
}
#include "mockfs.hh"
#include "utils.hh"
using namespace testing;
const char reclaim_mib[] = "debug.try_reclaim_vnode";
class Forget: public FuseTest {
public:
void SetUp() {
if (geteuid() != 0)
GTEST_SKIP() << "Only root may use " << reclaim_mib;
if (-1 == sysctlbyname(reclaim_mib, NULL, 0, NULL, 0) &&
errno == ENOENT)
GTEST_SKIP() << reclaim_mib << " is not available";
FuseTest::SetUp();
}
};
/*
* When a fusefs vnode is reclaimed, it should send a FUSE_FORGET operation.
*/
TEST_F(Forget, ok)
{
const char FULLPATH[] = "mountpoint/some_file.txt";
const char RELPATH[] = "some_file.txt";
uint64_t ino = 42;
mode_t mode = S_IFREG | 0755;
sem_t sem;
int err;
ASSERT_EQ(0, sem_init(&sem, 0, 0)) << strerror(errno);
EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH)
.Times(3)
.WillRepeatedly(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.attr.nlink = 1;
out.body.entry.attr_valid = UINT64_MAX;
})));
expect_forget(ino, 3, &sem);
/*
* access(2) the file to force a lookup. Access it twice to double its
* lookup count.
*/
ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
err = sysctlbyname(reclaim_mib, NULL, 0, FULLPATH, sizeof(FULLPATH));
ASSERT_EQ(0, err) << strerror(errno);
sem_wait(&sem);
}
/*
* When a directory is reclaimed, the names of its entries vanish from the
* namecache
*/
TEST_F(Forget, invalidate_names)
{
const char FULLFPATH[] = "mountpoint/some_dir/some_file.txt";
const char FULLDPATH[] = "mountpoint/some_dir";
const char DNAME[] = "some_dir";
const char FNAME[] = "some_file.txt";
uint64_t dir_ino = 42;
uint64_t file_ino = 43;
int err;
EXPECT_LOOKUP(FUSE_ROOT_ID, DNAME)
.WillRepeatedly(Invoke(
ReturnImmediate([=](auto in __unused, auto& out) {
SET_OUT_HEADER_LEN(out, entry);
out.body.entry.attr.mode = S_IFDIR | 0755;
out.body.entry.nodeid = dir_ino;
out.body.entry.attr.nlink = 2;
out.body.entry.attr_valid = UINT64_MAX;
out.body.entry.entry_valid = UINT64_MAX;
})));
/*
* Even though we don't reclaim FNAME and its entry is cacheable, we
* should get two lookups because the reclaim of DNAME will invalidate
* the cached FNAME entry.
*/
EXPECT_LOOKUP(dir_ino, FNAME)
.Times(2)
.WillRepeatedly(Invoke(
ReturnImmediate([=](auto in __unused, auto& out) {
SET_OUT_HEADER_LEN(out, entry);
out.body.entry.attr.mode = S_IFREG | 0644;
out.body.entry.nodeid = file_ino;
out.body.entry.attr.nlink = 1;
out.body.entry.attr_valid = UINT64_MAX;
out.body.entry.entry_valid = UINT64_MAX;
})));
expect_forget(dir_ino, 2);
/* Access the file to cache its name */
ASSERT_EQ(0, access(FULLFPATH, F_OK)) << strerror(errno);
/* Reclaim the directory, invalidating its children from namecache */
err = sysctlbyname(reclaim_mib, NULL, 0, FULLDPATH, sizeof(FULLDPATH));
ASSERT_EQ(0, err) << strerror(errno);
/* Access the file again, causing another lookup */
ASSERT_EQ(0, access(FULLFPATH, F_OK)) << strerror(errno);
}

6
tests/sys/fs/fusefs/utils.cc
View File

@ -162,7 +162,7 @@ FuseTest::expect_flush(uint64_t ino, int times, ProcessMockerT r)
}
void
FuseTest::expect_forget(uint64_t ino, uint64_t nlookup)
FuseTest::expect_forget(uint64_t ino, uint64_t nlookup, sem_t *sem)
{
EXPECT_CALL(*m_mock, process(
ResultOf([=](auto in) {
@ -171,7 +171,9 @@ FuseTest::expect_forget(uint64_t ino, uint64_t nlookup)
in.body.forget.nlookup == nlookup);
}, Eq(true)),
_)
).WillOnce(Invoke([](auto in __unused, auto &out __unused) {
).WillOnce(Invoke([=](auto in __unused, auto &out __unused) {
if (sem != NULL)
sem_post(sem);
/* FUSE_FORGET has no response! */
}));
}

8
tests/sys/fs/fusefs/utils.hh
View File

@ -28,6 +28,9 @@
* SUCH DAMAGE.
*/
struct _sem;
typedef struct _sem sem_t;
/* Nanoseconds to sleep, for tests that must */
#define NAP_NS (100'000'000)
@ -92,9 +95,10 @@ class FuseTest : public ::testing::Test {
/*
* Create an expectation that FUSE_FORGET will be called for the given
* inode. There will be no response
* inode. There will be no response. If sem is provided, it will be
* posted after the operation is received by the daemon.
*/
void expect_forget(uint64_t ino, uint64_t nlookup);
void expect_forget(uint64_t ino, uint64_t nlookup, sem_t *sem = NULL);
/*
* Create an expectation that FUSE_GETATTR will be called for the given