// Change the working directory of the process, and verify that we can open a
// file using the relative path.
func TestChdir(test *testing.T) {
fs, proc := OpenMinixImage(test)
// Change into /var and then try to open run/syslogd.pid
if err := proc.Chdir("/var"); err != nil {
testutils.FatalHere(test, "Failed to change directory: %s", err)
}
if proc.workdir.Inum != 543 {
testutils.FatalHere(test, "Got wrong inode expected %d, got %d", 543, proc.workdir.Inum)
}
// Fetch something with a relative path
rip, err := fs.eatPath(proc, "run/syslogd.pid")
if err != nil {
testutils.FatalHere(test, "Could not open relative file: %s", err)
}
if rip.Inum != 481 {
testutils.FatalHere(test, "Got wrong inode expected %d, got %d", 481, rip.Inum)
}
fs.itable.PutInode(rip)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
// Ensure that an open process prevents clean shutdown
func TestSpawnNoExit(test *testing.T) {
fs, proc := OpenMinixImage(test)
_, err := proc.Fork()
if err != nil {
testutils.FatalHere(test, "Failed when spawning new process: %s", err)
}
err = fs.Shutdown()
if err != common.EBUSY {
testutils.FatalHere(test, "Expected EBUSY error, got: %v", err)
}
}
// Create a new file on the file system, ensure that it is given the
// appropriate inode number and created successfully. Then unlink the file
// so the file system remains in the same state it began in.
func TestCreateThenUnlink(test *testing.T) {
fs, proc := OpenMinixImage(test)
alloc := proc.rootdir.Devinfo.AllocTbl
// Check the state of the bitmap before creating this file
inum, err := alloc.AllocInode()
if err != nil {
testutils.FatalHere(test, "Error pre-allocating an inode: %s", err)
}
alloc.FreeInode(inum)
// Get block 13 and print it before we make any changes
//bp := fs.bcache.GetBlock(ROOT_DEVICE, 13, INODE_BLOCK, NORMAL)
//debug.PrintBlock(bp, fs.devinfo[ROOT_DEVICE])
// Create a new file and check allocation tables, etc.
file, err := fs.Open(proc, "/tmp/created_file", common.O_CREAT, 0666)
if err != nil {
testutils.FatalHere(test, "Failed when creating new file: %s", err)
}
filp := file.(*filp)
if filp.inode.Inum != inum {
testutils.ErrorHere(test, "Inum mismatch expected %d, got %d", inum, filp.inode.Inum)
}
// Close and unlink the new file
err = fs.Close(proc, file)
if err != nil {
testutils.ErrorHere(test, "Failed when closing new file: %s", err)
}
err = fs.Unlink(proc, "/tmp/created_file")
if err != nil {
testutils.ErrorHere(test, "Failed when unlinking new file: %s", err)
}
// The bit we just freed should be our next
inum2, err := alloc.AllocInode()
if err != nil {
testutils.FatalHere(test, "Failed when checking inode allocation: %s", err)
}
if inum != inum2 {
testutils.FatalHere(test, "Inode mismatch expected %d, got %d", inum, inum2)
}
alloc.FreeInode(inum2)
fs.Exit(proc)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
// Ensure cleanup happens properly with fork/exit
func TestForkWithExit(test *testing.T) {
fs, proc := OpenMinixImage(test)
child, err := proc.Fork()
if err != nil {
testutils.FatalHere(test, "Failed when spawning new process: %s", err)
}
child.Exit()
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
func TestShutdownNoRootProcExit(test *testing.T) {
fs, _ := OpenMinixImage(test)
err := fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed shutting down: %s", err)
}
}
func OpenEuroparl(test *testing.T) *os.File {
filename := getExtraFilename("europarl-en.txt")
file, err := os.OpenFile(filename, os.O_RDONLY, 0666)
if err != nil {
testutils.FatalHere(test, "Could not open Europarl reference: %s", err)
}
return file
}
func OpenMinixImage(test *testing.T) (*FileSystem, *Process) {
imageFilename := getExtraFilename("minix3root.img")
fs, proc, err := OpenFileSystemFile(imageFilename)
if err != nil {
testutils.FatalHere(test, "Failed opening file system: %s", err)
}
return fs, proc
}
// Test read functionality by reading the same file from the guest/host
// operating systems and comparing the results of sucessive read calls. The
// number of bytes read per call is set to (4/3) of the block size of the file
// system to ensure that we hit all codepaths.
func TestRead(test *testing.T) {
fs, proc := OpenMinixImage(test)
file, err := fs.Open(proc, "/sample/europarl-en.txt", common.O_RDONLY, 0666)
if err != nil {
testutils.FatalHere(test, "Failed when opening file: %s", err)
}
ofile := OpenEuroparl(test)
// Read and compare the two files
blocksize := fs.devinfo[common.ROOT_DEVICE].Blocksize
numbytes := blocksize + (blocksize / 3)
data := make([]byte, numbytes)
odata := make([]byte, numbytes)
offset := 0
for {
n, err := file.Read(data)
od, oerr := ofile.Read(odata)
if n != od {
testutils.FatalHere(test, "Bytes read mismatch at offset %d: expected %d, got %d", offset, od, n)
}
if err != oerr {
testutils.FatalHere(test, "Error mismatch at offset %d: expected '%s', got '%s'", offset, oerr, err)
}
if bytes.Compare(data, odata) != 0 {
testutils.FatalHere(test, "Data mismatch at offset %d\n==Expected\n%s\n==Got\n%s", offset, odata, data)
}
if err == io.EOF && oerr == io.EOF {
break
}
offset += n
}
fs.Exit(proc)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
// Test that we can open and close a file
func TestOpenClose(test *testing.T) {
fs, proc := OpenMinixImage(test)
file, err := proc.Open("/sample/europarl-en.txt", common.O_RDONLY, 0666)
if err != nil {
testutils.FatalHere(test, "Failed opening file: %s", err)
}
found, count := checkFileAndCount(proc, file)
if !found {
testutils.FatalHere(test, "Did not find open file in proc.files")
}
if count != 1 {
testutils.FatalHere(test, "Open file count incorrect got %d, expected %d", count, 1)
}
// Now close the file and make sure things are cleaned up
err = proc.Close(file)
found, count = checkFileAndCount(proc, file)
if found {
testutils.FatalHere(test, "Found file in process table, should not have")
}
if count != 0 {
testutils.FatalHere(test, "Open file count mismatch got %d, expected %d", count, 0)
}
// How many goroutines are open right now?
numgoros := runtime.NumGoroutine()
stacknow := make([]byte, 4096)
runtime.Stack(stacknow, true)
fs.Exit(proc)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
// We expect shutdown to have killed the following goroutines
// * device
// * block cache
// * inode cache
// * allocation table
// * file server
// This test is fragile, so be careful with it!
expected := numgoros - 5
if runtime.NumGoroutine() != expected {
test.Logf("Original stack:\n%s\n", stacknow)
newstack := make([]byte, 4096)
runtime.Stack(newstack, true)
test.Logf("Current stack:\n%s\n", newstack)
testutils.FatalHere(test, "Goroutine count mismatch got %d, expected %d", expected, runtime.NumGoroutine())
}
}
// Test changin the position within an open file using the same technique as
// TestRead, by comparing to the POSIX API provided by the Go standard
// libraries corresponding calls.
func TestSeek(test *testing.T) {
fs, proc := OpenMinixImage(test)
file, err := fs.Open(proc, "/sample/europarl-en.txt", common.O_RDONLY, 0666)
if err != nil {
testutils.FatalHere(test, "Failed when opening file: %s", err)
}
ofile := OpenEuroparl(test)
type seekData struct {
whence int
pos int
}
seekOps := []seekData{
{0, 0},
{0, 31337},
{1, 3333},
}
// Read and compare several blocks of the file, seeking between each read.
// This ensures that our seek behaviour is the same as POSIX.
blocksize := fs.devinfo[common.ROOT_DEVICE].Blocksize
numbytes := blocksize + (blocksize / 3)
data := make([]byte, numbytes)
odata := make([]byte, numbytes)
for idx, testData := range seekOps {
pos, err := file.Seek(testData.pos, testData.whence)
opos, err := ofile.Seek(int64(testData.pos), testData.whence)
if int64(pos) != opos {
testutils.FatalHere(test, "Seek position mismatch in test %d: exected %d, got %d", idx, opos, pos)
}
n, err := file.Read(data)
od, oerr := ofile.Read(odata)
if n != od {
testutils.FatalHere(test, "Bytes read mismatch at offset %d: expected %d, got %d", idx, od, n)
}
if err != oerr {
testutils.FatalHere(test, "Error mismatch at offset %d: expected '%s', got '%s'", idx, oerr, err)
}
if bytes.Compare(data, odata) != 0 {
testutils.FatalHere(test, "Data mismatch at offset %d\n==Expected\n%s\n==Got\n%s", idx, odata, data)
}
}
fs.Exit(proc)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
// Make a new directory on the file system, ensure that it is given the
// appropriate number/contents, then rmdir the file and check that the file
// system is returned to its initial state.
func TestMkdir(test *testing.T) {
fs, proc := OpenMinixImage(test)
bitmap := proc.rootdir.Devinfo.AllocTbl
// Check the state of the bitmaps before creating this file
inum, err := bitmap.AllocInode()
if err != nil {
testutils.FatalHere(test, "Error pre-allocating an inode: %s", err)
}
bitmap.FreeInode(inum)
znum, err := bitmap.AllocZone(common.NO_ZONE)
if err != nil {
testutils.FatalHere(test, "Error pre-allocating a zone: %s", err)
}
bitmap.FreeZone(znum)
// Create a new file and check allocation tables, etc.
err = fs.Mkdir(proc, "/tmp/new_directory", 0666)
if err != nil {
testutils.FatalHere(test, "Failed when creating new directory: %s", err)
}
dirp, err := fs.eatPath(proc, "/tmp/new_directory")
if err != nil {
testutils.FatalHere(test, "Failed when looking up new directory: %s", err)
}
if dirp.Inum != inum {
testutils.ErrorHere(test, "Inum mismatch expected %d, got %d", inum, dirp.Inum)
}
ok, devnum, inum := Lookup(dirp, ".")
if !ok {
testutils.ErrorHere(test, "Current directory . lookup failed")
}
if devnum != dirp.Devinfo.Devnum {
testutils.ErrorHere(test, "Current directory . devnum mismatch expected %d, got %d", dirp.Devinfo.Devnum, devnum)
}
if inum != dirp.Inum {
testutils.ErrorHere(test, "Current directory . inum mismatch expected %d, got %d", dirp.Inum, inum)
}
if !dirp.IsDirectory() {
testutils.ErrorHere(test, "New directory is not a directory")
}
if dirp.Nlinks != 2 {
testutils.ErrorHere(test, "Links mismatch expected %d, got %d", 2, dirp.Nlinks)
}
if dirp.Size != 128 {
testutils.ErrorHere(test, "Directory size mismatch expected %d, got %d", 128, dirp.Size)
}
fs.itable.PutInode(dirp)
// Remove the new directory
err = fs.Rmdir(proc, "/tmp/new_directory")
if err != nil {
testutils.ErrorHere(test, "Failed when unlinking new directory: %s", err)
}
// The bit we just freed should be our next
inum2, err := bitmap.AllocInode()
if err != nil {
testutils.ErrorHere(test, "Failed when checking inode allocation: %s", err)
}
if inum != inum2 {
testutils.ErrorHere(test, "Inode mismatch expected %d, got %d", inum, inum2)
}
bitmap.FreeInode(inum2)
fs.Exit(proc)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
// Test write functionality by taking the data from the host system and
// writing it to the guest system along with the host system (at the same
// time) and comparing the returns from these functions. Then compare the
// written data to the original data to make sure it was written correctly.
func TestWrite(test *testing.T) {
fs, proc := OpenMinixImage(test)
ofile := OpenEuroparl(test)
// Read the data for the entire file
filesize := 4489799 // known
filedata, err := ioutil.ReadAll(ofile)
if err != nil {
testutils.FatalHere(test, "Failed when reading from original file: %s", err)
}
if filesize != len(filedata) {
testutils.FatalHere(test, "File content sizes differ: %v != %v", len(filedata), filesize)
}
if ofile.Close() != nil {
testutils.FatalHere(test, "Failed when closing original file: %s", err)
}
// Open the two files that will be written to
gfile, err := fs.Open(proc, "/tmp/europarl-en.txt", common.O_CREAT|common.O_TRUNC|common.O_RDWR, 0666)
if err != nil || gfile == nil {
testutils.FatalHere(test, "Could not open file on guest: %s", err)
}
hfile, err := os.OpenFile("/tmp/europarl-en.txt", os.O_CREATE|os.O_TRUNC|os.O_RDWR, 0666)
if err != nil || hfile == nil {
testutils.FatalHere(test, "Could not open file on host: %s", err)
}
// Write the data to a file on the host/guest operating systems in sync
blocksize := fs.devinfo[common.ROOT_DEVICE].Blocksize
numbytes := blocksize + (blocksize / 3)
pos := 0
for pos < filesize {
// Write the next numbytes bytes to the file
endpos := pos + numbytes
if endpos > filesize {
endpos = filesize
}
data := filedata[pos:endpos]
gn, gerr := gfile.Write(data)
hn, herr := hfile.Write(data)
if gn != hn {
testutils.ErrorHere(test, "Bytes read mismatch at offset %d: expected %d, got %d", pos, hn, gn)
}
if gerr != herr {
testutils.ErrorHere(test, "Error mismatch at offset %d: expected '%s', got '%s'", pos, herr, gerr)
}
rip, err := fs.eatPath(proc, "/tmp/europarl-en.txt")
if err != nil {
testutils.FatalHere(test, "After write at position %d: could not locate newly created file: %s", pos, err)
} else {
fs.itable.PutInode(rip)
}
pos += gn
}
if hfile.Close() != nil {
testutils.ErrorHere(test, "Failed when closing host file")
}
// Seek to beginning of file
gfile.Seek(0, 0)
written := make([]byte, filesize)
n, err := gfile.Read(written)
if n != filesize {
testutils.ErrorHere(test, "Verify count mismatch expected %d, got %d", filesize, n)
}
if err != nil {
testutils.ErrorHere(test, "Error when reading to verify: %s", err)
}
compare := bytes.Compare(filedata, written)
if compare != 0 {
testutils.ErrorHere(test, "Error comparing written data expected %d, got %d", 0, compare)
}
if fs.Close(proc, gfile) != nil {
testutils.ErrorHere(test, "Error when closing out the written file: %s", err)
}
err = fs.Unlink(proc, "/tmp/europarl-en.txt")
if err != nil {
testutils.ErrorHere(test, "Failed when unlinking written file: %s", err)
}
fs.Exit(proc)
err = fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}
// Test that path lookups function properly
func TestEatPath(test *testing.T) {
fs, proc := OpenMinixImage(test)
// Fetch some additional inodes to ensure path lookup is functioning
// properly.
//
// inode permission link size name
// 1 drwxr-xr-x 14 1088 /
// 2 drwxr-xr-x 2 128 /usr
// 541 drwxr-xr-x 2 192 /sample
// 542 -rw-r--r-- 1 4489799 /sample/europarl-en.txt
// 35 -rw------- 2 2705920 /boot/image/3.1.8
// 540 -rw-r--r-- 1 395 /root/.ssh/known_hosts
// 481 -rw------- 1 5 /var/run/syslogd.pid
type inodeTest struct {
path string
inum int
links int
size int
zones []int
}
inodeTests := []inodeTest{
{"/", 1, 14, 1088, nil},
{"/usr", 2, 2, 128, nil},
{"/sample", 541, 2, 192, nil},
{"/sample/europarl-en.txt", 542, 1, 4489799, nil},
{"/boot/image/3.1.8", 35, 2, 2705920, nil},
{"/root/.ssh/known_hosts", 540, 1, 395, nil},
{"/var/run/syslogd.pid", 481, 1, 5, nil},
}
for _, itest := range inodeTests {
rip, err := fs.eatPath(proc, itest.path)
if err != nil {
testutils.FatalHere(test, "Failed when fetching inode for %s: %s", itest.path, err)
}
if itest.inum != -1 && rip.Inum != itest.inum {
testutils.ErrorHere(test, "[%s] mismatch for inum got %d, expected %d", itest.path, rip.Inum, itest.inum)
}
if itest.links != -1 && rip.Nlinks != uint16(itest.links) {
testutils.ErrorHere(test, "[%s] mismatch for links got %d, expected %d", itest.path, rip.Nlinks, itest.links)
}
if itest.size != -1 && rip.Size != int32(itest.size) {
testutils.ErrorHere(test, "[%s] mismatch for size got %d, expected %d", itest.path, rip.Size, itest.size)
}
for i := 0; i < 10; i++ {
if i < len(itest.zones) && rip.Zone[i] != uint32(itest.zones[i]) {
testutils.ErrorHere(test, "[%s] mismatch for zone[%d] got %d, expected %d", i, itest.path, rip.Zone[i], itest.zones[i])
}
}
// Convert the test to use a relative path and then compare the inodes
if len(itest.path) > 1 {
relpath := itest.path[1:]
relrip, err := fs.eatPath(proc, relpath)
if err != nil {
testutils.ErrorHere(test, "Failed fetching relative path %s", relpath)
}
if relrip != rip {
testutils.ErrorHere(test, "Relative inode does not match absolute inode for path %s", itest.path)
}
fs.itable.PutInode(relrip)
}
fs.itable.PutInode(rip)
}
fs.Exit(proc)
err := fs.Shutdown()
if err != nil {
testutils.FatalHere(test, "Failed when shutting down filesystem: %s", err)
}
}