0c9df4afc2
The actual overflow occured in the ReadAhead.readahead test. Surprisingly it has never segfaulted or resulted in any bad behavior. MFC after: 1 week Sponsored by: Axcient Reviewed by: emaste Differential Revision: https://reviews.freebsd.org/D38718
259 lines
7.1 KiB
C++
259 lines
7.1 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/param.h>
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#include <sys/ioctl.h>
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#include <sys/filio.h>
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#include <fcntl.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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const static char FULLPATH[] = "mountpoint/foo";
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const static char RELPATH[] = "foo";
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class Bmap: public FuseTest {
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public:
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virtual void SetUp() {
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m_maxreadahead = UINT32_MAX;
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FuseTest::SetUp();
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}
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void expect_bmap(uint64_t ino, uint64_t lbn, uint32_t blocksize, uint64_t pbn)
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{
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EXPECT_CALL(*m_mock, process(
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ResultOf([=](auto in) {
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return (in.header.opcode == FUSE_BMAP &&
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in.header.nodeid == ino &&
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in.body.bmap.block == lbn &&
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in.body.bmap.blocksize == blocksize);
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}, Eq(true)),
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_)
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).WillOnce(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, bmap);
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out.body.bmap.block = pbn;
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})));
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}
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void expect_lookup(const char *relpath, uint64_t ino, off_t size)
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{
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FuseTest::expect_lookup(relpath, ino, S_IFREG | 0644, size, 1,
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UINT64_MAX);
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}
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};
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class BmapEof: public Bmap, public WithParamInterface<int> {};
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/*
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* Test FUSE_BMAP
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* XXX The FUSE protocol does not include the runp and runb variables, so those
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* must be guessed in-kernel.
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*/
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TEST_F(Bmap, bmap)
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{
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struct fiobmap2_arg arg;
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/*
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* Pick fsize and lbn large enough that max length runs won't reach
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* either beginning or end of file
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*/
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const off_t filesize = 1 << 30;
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int64_t lbn = 100;
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int64_t pbn = 12345;
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const ino_t ino = 42;
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int fd;
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expect_lookup(RELPATH, 42, filesize);
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expect_open(ino, 0, 1);
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expect_bmap(ino, lbn, m_maxbcachebuf, pbn);
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fd = open(FULLPATH, O_RDWR);
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ASSERT_LE(0, fd) << strerror(errno);
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arg.bn = lbn;
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arg.runp = -1;
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arg.runb = -1;
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ASSERT_EQ(0, ioctl(fd, FIOBMAP2, &arg)) << strerror(errno);
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EXPECT_EQ(arg.bn, pbn);
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EXPECT_EQ(arg.runp, m_maxphys / m_maxbcachebuf - 1);
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EXPECT_EQ(arg.runb, m_maxphys / m_maxbcachebuf - 1);
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leak(fd);
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}
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/*
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* If the daemon does not implement VOP_BMAP, fusefs should return sensible
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* defaults.
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*/
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TEST_F(Bmap, default_)
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{
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struct fiobmap2_arg arg;
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const off_t filesize = 1 << 30;
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const ino_t ino = 42;
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int64_t lbn;
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int fd;
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expect_lookup(RELPATH, 42, filesize);
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expect_open(ino, 0, 1);
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EXPECT_CALL(*m_mock, process(
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ResultOf([=](auto in) {
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return (in.header.opcode == FUSE_BMAP);
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}, Eq(true)),
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_)
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).WillOnce(Invoke(ReturnErrno(ENOSYS)));
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fd = open(FULLPATH, O_RDWR);
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ASSERT_LE(0, fd) << strerror(errno);
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/* First block */
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lbn = 0;
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arg.bn = lbn;
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arg.runp = -1;
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arg.runb = -1;
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ASSERT_EQ(0, ioctl(fd, FIOBMAP2, &arg)) << strerror(errno);
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EXPECT_EQ(arg.bn, 0);
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EXPECT_EQ(arg.runp, m_maxphys / m_maxbcachebuf - 1);
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EXPECT_EQ(arg.runb, 0);
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/* In the middle */
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lbn = filesize / m_maxbcachebuf / 2;
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arg.bn = lbn;
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arg.runp = -1;
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arg.runb = -1;
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ASSERT_EQ(0, ioctl(fd, FIOBMAP2, &arg)) << strerror(errno);
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EXPECT_EQ(arg.bn, lbn * m_maxbcachebuf / DEV_BSIZE);
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EXPECT_EQ(arg.runp, m_maxphys / m_maxbcachebuf - 1);
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EXPECT_EQ(arg.runb, m_maxphys / m_maxbcachebuf - 1);
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/* Last block */
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lbn = filesize / m_maxbcachebuf - 1;
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arg.bn = lbn;
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arg.runp = -1;
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arg.runb = -1;
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ASSERT_EQ(0, ioctl(fd, FIOBMAP2, &arg)) << strerror(errno);
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EXPECT_EQ(arg.bn, lbn * m_maxbcachebuf / DEV_BSIZE);
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EXPECT_EQ(arg.runp, 0);
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EXPECT_EQ(arg.runb, m_maxphys / m_maxbcachebuf - 1);
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leak(fd);
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}
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/*
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* VOP_BMAP should not query the server for the file's size, even if its cached
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* attributes have expired.
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* Regression test for https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256937
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*/
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TEST_P(BmapEof, eof)
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{
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/*
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* Outline:
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* 1) lookup the file, setting attr_valid=0
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* 2) Read more than one block, causing the kernel to issue VOP_BMAP to
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* plan readahead.
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* 3) Nothing should panic
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* 4) Repeat the tests, truncating the file after different numbers of
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* GETATTR operations.
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*/
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Sequence seq;
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const off_t filesize = 2 * m_maxbcachebuf;
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const ino_t ino = 42;
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mode_t mode = S_IFREG | 0644;
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void *buf;
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int fd;
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int ngetattrs;
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ngetattrs = GetParam();
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FuseTest::expect_lookup(RELPATH, ino, mode, filesize, 1, 0);
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expect_open(ino, 0, 1);
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// Depending on ngetattrs, FUSE_READ could be called with either
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// filesize or filesize / 2 .
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EXPECT_CALL(*m_mock, process(
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ResultOf([=](auto in) {
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return (in.header.opcode == FUSE_READ &&
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in.header.nodeid == ino &&
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in.body.read.offset == 0 &&
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( in.body.read.size == filesize ||
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in.body.read.size == filesize / 2));
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}, Eq(true)),
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_)
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).WillOnce(Invoke(ReturnImmediate([=](auto in, auto& out) {
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size_t osize = in.body.read.size;
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assert(osize < sizeof(out.body.bytes));
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out.header.len = sizeof(struct fuse_out_header) + osize;
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bzero(out.body.bytes, osize);
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})));
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EXPECT_CALL(*m_mock, process(
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ResultOf([](auto in) {
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return (in.header.opcode == FUSE_GETATTR &&
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in.header.nodeid == ino);
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}, Eq(true)),
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_)
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).Times(Between(ngetattrs - 1, ngetattrs))
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.InSequence(seq)
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.WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, attr);
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out.body.attr.attr_valid = 0;
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out.body.attr.attr.ino = ino;
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out.body.attr.attr.mode = S_IFREG | 0644;
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out.body.attr.attr.size = filesize;
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})));
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EXPECT_CALL(*m_mock, process(
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ResultOf([](auto in) {
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return (in.header.opcode == FUSE_GETATTR &&
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in.header.nodeid == ino);
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}, Eq(true)),
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_)
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).InSequence(seq)
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.WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto& out) {
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SET_OUT_HEADER_LEN(out, attr);
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out.body.attr.attr_valid = 0;
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out.body.attr.attr.ino = ino;
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out.body.attr.attr.mode = S_IFREG | 0644;
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out.body.attr.attr.size = filesize / 2;
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})));
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buf = calloc(1, filesize);
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fd = open(FULLPATH, O_RDWR);
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ASSERT_LE(0, fd) << strerror(errno);
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read(fd, buf, filesize);
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leak(fd);
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}
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INSTANTIATE_TEST_CASE_P(BE, BmapEof,
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Values(1, 2, 3)
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);
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