3227325366
* We never send FUSE_LOOKUP for the root inode, since its inode number is hard-coded to 1. Therefore, we should not send FUSE_FORGET for it, lest the server see its lookup count fall below 0. * During VOP_RECLAIM, if we are reclaiming the root inode, we must clear the file system's vroot pointer. Otherwise it will be left pointing at a reclaimed vnode, which will cause future VOP_LOOKUP operations to fail. Previously we only cleared that pointer during VFS_UMOUNT. I don't know of any real-world way to trigger this bug. MFC after: 2 weeks Reviewed by: pfg Differential Revision: https://reviews.freebsd.org/D34753
181 lines
5.2 KiB
C++
181 lines
5.2 KiB
C++
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2019 The FreeBSD Foundation
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*
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* This software was developed by BFF Storage Systems, LLC under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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extern "C" {
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <sys/sysctl.h>
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#include <fcntl.h>
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#include <semaphore.h>
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#include <unistd.h>
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}
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#include "mockfs.hh"
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#include "utils.hh"
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using namespace testing;
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class Forget: public FuseTest {
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public:
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void SetUp() {
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if (geteuid() != 0)
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GTEST_SKIP() << "Only root may use " << reclaim_mib;
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FuseTest::SetUp();
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}
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};
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/*
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* When a fusefs vnode is reclaimed, it should send a FUSE_FORGET operation.
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*/
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TEST_F(Forget, ok)
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{
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const char FULLPATH[] = "mountpoint/some_file.txt";
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const char RELPATH[] = "some_file.txt";
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uint64_t ino = 42;
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mode_t mode = S_IFREG | 0755;
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sem_t sem;
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ASSERT_EQ(0, sem_init(&sem, 0, 0)) << strerror(errno);
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EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH)
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.Times(3)
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.WillRepeatedly(Invoke(
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ReturnImmediate([=](auto in __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, entry);
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out.body.entry.attr.mode = mode;
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out.body.entry.nodeid = ino;
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out.body.entry.attr.nlink = 1;
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out.body.entry.attr_valid = UINT64_MAX;
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})));
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expect_forget(ino, 3, &sem);
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/*
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* access(2) the file to force a lookup. Access it twice to double its
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* lookup count.
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*/
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ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
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ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
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reclaim_vnode(FULLPATH);
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sem_wait(&sem);
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sem_destroy(&sem);
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}
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/*
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* When a directory is reclaimed, the names of its entries vanish from the
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* namecache
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*/
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TEST_F(Forget, invalidate_names)
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{
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const char FULLFPATH[] = "mountpoint/some_dir/some_file.txt";
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const char FULLDPATH[] = "mountpoint/some_dir";
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const char DNAME[] = "some_dir";
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const char FNAME[] = "some_file.txt";
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uint64_t dir_ino = 42;
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uint64_t file_ino = 43;
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EXPECT_LOOKUP(FUSE_ROOT_ID, DNAME)
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.Times(2)
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.WillRepeatedly(Invoke(
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ReturnImmediate([=](auto in __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, entry);
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out.body.entry.attr.mode = S_IFDIR | 0755;
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out.body.entry.nodeid = dir_ino;
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out.body.entry.attr.nlink = 2;
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out.body.entry.attr_valid = UINT64_MAX;
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out.body.entry.entry_valid = UINT64_MAX;
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})));
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/*
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* Even though we don't reclaim FNAME and its entry is cacheable, we
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* should get two lookups because the reclaim of DNAME will invalidate
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* the cached FNAME entry.
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*/
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EXPECT_LOOKUP(dir_ino, FNAME)
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.Times(2)
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.WillRepeatedly(Invoke(
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ReturnImmediate([=](auto in __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, entry);
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out.body.entry.attr.mode = S_IFREG | 0644;
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out.body.entry.nodeid = file_ino;
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out.body.entry.attr.nlink = 1;
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out.body.entry.attr_valid = UINT64_MAX;
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out.body.entry.entry_valid = UINT64_MAX;
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})));
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expect_forget(dir_ino, 1);
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/* Access the file to cache its name */
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ASSERT_EQ(0, access(FULLFPATH, F_OK)) << strerror(errno);
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/* Reclaim the directory, invalidating its children from namecache */
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reclaim_vnode(FULLDPATH);
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/* Access the file again, causing another lookup */
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ASSERT_EQ(0, access(FULLFPATH, F_OK)) << strerror(errno);
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}
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/*
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* Reclaiming the root inode should not send a FUSE_FORGET request, nor should
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* it interfere with further lookup operations.
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*/
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TEST_F(Forget, root)
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{
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const char FULLPATH[] = "mountpoint/some_file.txt";
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const char RELPATH[] = "some_file.txt";
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uint64_t ino = 42;
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mode_t mode = S_IFREG | 0755;
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EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH)
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.WillRepeatedly(Invoke(
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ReturnImmediate([=](auto in __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, entry);
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out.body.entry.attr.mode = mode;
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out.body.entry.nodeid = ino;
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out.body.entry.attr.nlink = 1;
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out.body.entry.attr_valid = UINT64_MAX;
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out.body.entry.entry_valid = UINT64_MAX;
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})));
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/* access(2) the file to force a lookup. */
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ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
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reclaim_vnode("mountpoint");
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nap();
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/* Access it again, to make sure it's still possible. */
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ASSERT_EQ(0, access(FULLPATH, F_OK)) << strerror(errno);
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}
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