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fs_test.go
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fs_test.go
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package hafs
import (
"bytes"
"errors"
"fmt"
"io"
iofs "io/fs"
mathrand "math/rand"
"os"
"testing"
"time"
"github.com/apple/foundationdb/bindings/go/src/fdb"
"github.com/apple/foundationdb/bindings/go/src/fdb/tuple"
)
func tmpFs(t *testing.T) *Fs {
db := tmpDB(t)
fs, err := Attach(db, "testfs", AttachOpts{})
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() {
err = fs.Close()
if err != nil {
t.Logf("unable to close fs: %s", err)
}
})
return fs
}
func TestExclusiveLockRecordMarshalAndUnmarshal(t *testing.T) {
t.Parallel()
lr1 := exclusiveLockRecord{
Owner: 0xffffffffffffffff,
ClientId: "foobar",
}
lr2 := exclusiveLockRecord{}
buf, _ := lr1.MarshalBinary()
_ = lr2.UnmarshalBinary(buf)
if lr1 != lr2 {
t.Fatalf("%v != %v", lr1, lr2)
}
}
func TestDirEntMarshalAndUnmarshal(t *testing.T) {
t.Parallel()
e1 := DirEnt{
Mode: S_IFDIR,
Ino: 12345,
}
e2 := DirEnt{}
buf, _ := e1.MarshalBinary()
_ = e2.UnmarshalBinary(buf)
if e1 != e2 {
t.Fatalf("%v != %v", e1, e2)
}
}
func TestStatMarshalAndUnmarshal(t *testing.T) {
t.Parallel()
s1 := Stat{
Size: 1,
Atimesec: 2,
Mtimesec: 3,
Ctimesec: 4,
Atimensec: 5,
Mtimensec: 6,
Ctimensec: 7,
Mode: 8,
Nlink: 9,
Uid: 10,
Gid: 11,
Rdev: 12,
}
s2 := Stat{}
buf, _ := s1.MarshalBinary()
_ = s2.UnmarshalBinary(buf)
if s1 != s2 {
t.Fatalf("%v != %v", s1, s2)
}
}
func TestMkfsAndAttach(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
stat, err := fs.GetStat(ROOT_INO)
if err != nil {
t.Fatal(err)
}
if stat.Mode&S_IFMT != S_IFDIR {
t.Fatal("unexpected mode")
}
err = fs.Close()
if err != nil {
t.Fatal(err)
}
}
func TestMknod(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
fooStat, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
_, err = fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if !errors.Is(err, ErrExist) {
t.Fatal(err)
}
directStat, err := fs.GetStat(fooStat.Ino)
if err != nil {
t.Fatal(err)
}
lookupStat, err := fs.Lookup(ROOT_INO, "foo")
if err != nil {
t.Fatal(err)
}
if directStat != lookupStat {
t.Fatalf("stats differ: %v != %v", directStat, lookupStat)
}
if directStat.Mode != S_IFDIR|0o777 {
t.Fatalf("unexpected mode: %d", directStat.Mode)
}
}
func TestSymlink(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
fooStat, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFLNK | 0o777,
Uid: 0,
Gid: 0,
LinkTarget: []byte("abc"),
})
if err != nil {
t.Fatal(err)
}
l, err := fs.ReadSymlink(fooStat.Ino)
if err != nil {
t.Fatal(err)
}
if string(l) != "abc" {
t.Fatalf("unexpected link target: %v", l)
}
}
func TestMknodTruncate(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
fooStat1, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFREG | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
fooStat2, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Truncate: true,
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
if fooStat1.Ino != fooStat2.Ino {
t.Fatalf("inodes differ")
}
}
func TestUnlink(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
err := fs.Unlink(ROOT_INO, "foo")
if !errors.Is(err, ErrNotExist) {
t.Fatal(err)
}
fooStat, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
err = fs.Unlink(ROOT_INO, "foo")
if err != nil {
t.Fatal(err)
}
stat, err := fs.GetStat(fooStat.Ino)
if err != nil {
t.Fatal(err)
}
if stat.Nlink != 0 {
t.Fatal("expected unlinked")
}
nRemoved, err := fs.RemoveExpiredUnlinked(RemoveExpiredUnlinkedOptions{
RemovalDelay: 10 * time.Second,
})
if err != nil {
t.Fatal(err)
}
if nRemoved != 0 {
t.Fatal("expected nothing to be removed")
}
nRemoved, err = fs.RemoveExpiredUnlinked(RemoveExpiredUnlinkedOptions{
RemovalDelay: 0,
})
if err != nil {
t.Fatal(err)
}
if nRemoved != 1 {
t.Fatal("expected file to be removed")
}
nRemoved, err = fs.RemoveExpiredUnlinked(RemoveExpiredUnlinkedOptions{
RemovalDelay: 0,
})
if err != nil {
t.Fatal(err)
}
if nRemoved != 0 {
t.Fatal("expected nothing to be removed")
}
}
func TestObjectStorageWriteOnce(t *testing.T) {
t.Parallel()
db := tmpDB(t)
storageDir := t.TempDir()
err := SetObjectStorageSpec(db, "testfs", "file://"+storageDir, SetObjectStorageSpecOpts{})
if err != nil {
t.Fatal(err)
}
fs, err := Attach(db, "testfs", AttachOpts{})
if err != nil {
t.Fatal(err)
}
defer fs.Close()
err = fs.SetXAttr(ROOT_INO, "hafs.object-storage", []byte("true"))
if err != nil {
t.Fatal(err)
}
f1, stat, err := fs.CreateFile(ROOT_INO, "f", CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
defer f1.Close()
_, err = f1.WriteData([]byte{1}, 0)
if err != nil {
t.Fatal(err)
}
err = f1.Fsync()
if err != nil {
t.Fatal(err)
}
f2, stat, err := fs.OpenFile(stat.Ino, OpenFileOpts{})
if err != nil {
t.Fatal(err)
}
defer f2.Close()
_, err = f2.WriteData([]byte{1}, 0)
if err == nil {
t.Fatal(err)
}
}
func TestObjectStorageReadWrite(t *testing.T) {
t.Parallel()
db := tmpDB(t)
storageDir := t.TempDir()
err := SetObjectStorageSpec(db, "testfs", "file://"+storageDir, SetObjectStorageSpecOpts{})
if err != nil {
t.Fatal(err)
}
smallObjectOptimizationThreshold := int64(1024)
fs, err := Attach(db, "testfs", AttachOpts{
SmallObjectOptimizationThreshold: uint64(smallObjectOptimizationThreshold),
})
if err != nil {
t.Fatal(err)
}
defer fs.Close()
err = fs.SetXAttr(ROOT_INO, "hafs.object-storage", []byte("true"))
if err != nil {
t.Fatal(err)
}
for i, sz := range []int64{1, 2, 10, smallObjectOptimizationThreshold, smallObjectOptimizationThreshold * 2} {
f, stat, err := fs.CreateFile(ROOT_INO, fmt.Sprintf("f%d", i), CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
defer f.Close()
expectedBuffer := make([]byte, 0, sz)
for j := int64(0); j < sz; j += 1 {
expectedBuffer = append(expectedBuffer, byte(j%256))
}
_, err = f.WriteData(expectedBuffer, 0)
if err != nil {
t.Fatal(err)
}
err = f.Fsync()
if err != nil {
t.Fatal(err)
}
err = f.Close()
if err != nil {
t.Fatal(err)
}
f, stat, err = fs.OpenFile(stat.Ino, OpenFileOpts{})
if err != nil {
t.Fatal(err)
}
defer f.Close()
buf := make([]byte, sz*2, sz*2)
n, err := f.ReadData(buf, 0)
if err != io.EOF {
t.Fatal(err)
}
if int64(n) != sz {
t.Fatal(n)
}
if !bytes.Equal(buf[:n], expectedBuffer) {
t.Fatal(buf)
}
if sz < smallObjectOptimizationThreshold {
_ = f.(*objectStoreSmallReadOnlyFile)
} else {
_ = f.(*objectStoreReadOnlyFile)
}
}
}
func TestObjectStorageUnlink(t *testing.T) {
t.Parallel()
db := tmpDB(t)
storageDir := t.TempDir()
err := SetObjectStorageSpec(db, "testfs", "file://"+storageDir, SetObjectStorageSpecOpts{})
if err != nil {
t.Fatal(err)
}
fs, err := Attach(db, "testfs", AttachOpts{})
if err != nil {
t.Fatal(err)
}
defer fs.Close()
err = fs.SetXAttr(ROOT_INO, "hafs.object-storage", []byte("true"))
if err != nil {
t.Fatal(err)
}
f, stat, err := fs.CreateFile(ROOT_INO, "f", CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
defer f.Close()
_, err = f.WriteData([]byte{1}, 0)
if err != nil {
t.Fatal(err)
}
err = f.Fsync()
if err != nil {
t.Fatal(err)
}
inodeDataPath := fmt.Sprintf("%s/%016x.%s", storageDir, stat.Ino, fs.fsName)
_, err = os.Stat(inodeDataPath)
if err != nil {
t.Fatal(err)
}
err = fs.Unlink(ROOT_INO, "f")
if err != nil {
t.Fatal(err)
}
nRemoved, err := fs.RemoveExpiredUnlinked(RemoveExpiredUnlinkedOptions{
RemovalDelay: 0,
})
if err != nil {
t.Fatal(err)
}
if nRemoved != 1 {
t.Fatal("expected file to be removed")
}
_, err = os.Stat(inodeDataPath)
if !errors.Is(err, iofs.ErrNotExist) {
t.Fatal(err)
}
}
func TestRenameSameDir(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
foo1Stat, err := fs.Mknod(ROOT_INO, "foo1", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
_, err = fs.Mknod(ROOT_INO, "foo2", MknodOpts{
Mode: S_IFREG | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
err = fs.Rename(ROOT_INO, ROOT_INO, "foo1", "bar1")
if err != nil {
t.Fatal(err)
}
_, err = fs.Lookup(ROOT_INO, "foo1")
if !errors.Is(err, ErrNotExist) {
t.Fatal(err)
}
bar1Stat, err := fs.Lookup(ROOT_INO, "bar1")
if err != nil {
t.Fatal(err)
}
if bar1Stat.Ino != foo1Stat.Ino {
t.Fatalf("bar1 stat is bad: %#v", bar1Stat)
}
}
func TestRenameSameDirOverwrite(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
foo1Stat, err := fs.Mknod(ROOT_INO, "foo1", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
f, _, err := fs.CreateFile(ROOT_INO, "bar1", CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
_, err = f.WriteData([]byte{1, 2, 3, 4, 5}, 0)
if err != nil {
t.Fatal(err)
}
err = f.Close()
if err != nil {
t.Fatal(err)
}
bcnt, err := fs.SubvolumeByteCount(ROOT_INO)
if err != nil {
t.Fatal(err)
}
if bcnt != 5 {
t.Fatal(bcnt)
}
icnt, err := fs.SubvolumeInodeCount(ROOT_INO)
if err != nil {
t.Fatal(err)
}
if icnt != 2 {
t.Fatal(icnt)
}
err = fs.Rename(ROOT_INO, ROOT_INO, "foo1", "bar1")
if err != nil {
t.Fatal(err)
}
_, err = fs.Lookup(ROOT_INO, "foo1")
if !errors.Is(err, ErrNotExist) {
t.Fatal(err)
}
bar1Stat, err := fs.Lookup(ROOT_INO, "bar1")
if err != nil {
t.Fatal(err)
}
if bar1Stat.Ino != foo1Stat.Ino {
t.Fatalf("bar1 stat is bad: %#v", bar1Stat)
}
nRemoved, err := fs.RemoveExpiredUnlinked(RemoveExpiredUnlinkedOptions{
RemovalDelay: 0,
})
if err != nil {
t.Fatal(err)
}
if nRemoved != 1 {
t.Fatal("expected file to be removed")
}
bcnt, err = fs.SubvolumeByteCount(ROOT_INO)
if err != nil {
t.Fatal(err)
}
if bcnt != 0 {
t.Fatal(bcnt)
}
icnt, err = fs.SubvolumeInodeCount(ROOT_INO)
if err != nil {
t.Fatal(err)
}
if icnt != 1 {
t.Fatal(icnt)
}
}
func TestRenameDifferentDir(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
dStat, err := fs.Mknod(ROOT_INO, "d", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
fooStat, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFREG | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
err = fs.Rename(ROOT_INO, dStat.Ino, "foo", "bar")
if err != nil {
t.Fatal(err)
}
_, err = fs.Lookup(ROOT_INO, "foo")
if !errors.Is(err, ErrNotExist) {
t.Fatal(err)
}
barStat, err := fs.Lookup(dStat.Ino, "bar")
if err != nil {
t.Fatal(err)
}
if barStat.Ino != fooStat.Ino {
t.Fatalf("bar1 stat is bad: %#v", barStat)
}
}
func TestRenameDifferentDirOverwrite(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
dStat, err := fs.Mknod(ROOT_INO, "d", MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
_, err = fs.Mknod(dStat.Ino, "bar", MknodOpts{
Mode: S_IFREG | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
fooStat, err := fs.Mknod(ROOT_INO, "foo", MknodOpts{
Mode: S_IFREG | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
err = fs.Rename(ROOT_INO, dStat.Ino, "foo", "bar")
if err != nil {
t.Fatal(err)
}
_, err = fs.Lookup(ROOT_INO, "foo")
if !errors.Is(err, ErrNotExist) {
t.Fatal(err)
}
barStat, err := fs.Lookup(dStat.Ino, "bar")
if err != nil {
t.Fatal(err)
}
if barStat.Ino != fooStat.Ino {
t.Fatalf("bar1 stat is bad: %#v", barStat)
}
nRemoved, err := fs.RemoveExpiredUnlinked(RemoveExpiredUnlinkedOptions{
RemovalDelay: 0,
})
if err != nil {
t.Fatal(err)
}
if nRemoved != 1 {
t.Fatal("expected file to be removed")
}
}
func TestDirIter(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
const COUNT = _DIR_ITER_BATCH_SIZE*3 + _DIR_ITER_BATCH_SIZE/3
for i := 0; i < COUNT; i += 1 {
_, err := fs.Mknod(ROOT_INO, fmt.Sprintf("a%d", i), MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
}
di, err := fs.IterDirEnts(ROOT_INO)
if err != nil {
t.Fatal(err)
}
count := 0
for {
_, err := di.Next()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
t.Fatalf("unexpected error %s", err)
}
count += 1
}
if count != COUNT {
t.Fatalf("unexpected count: %d", count)
}
}
func TestDirIterPlus(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
const COUNT = _DIR_ITER_BATCH_SIZE*2 + 57
for i := 0; i < COUNT; i += 1 {
_, err := fs.Mknod(ROOT_INO, fmt.Sprintf("a%d", i), MknodOpts{
Mode: S_IFDIR | 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
}
di, err := fs.IterDirEnts(ROOT_INO)
if err != nil {
t.Fatal(err)
}
count := 0
for {
dirEnt, stat, err := di.NextPlus()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
t.Fatalf("unexpected error %s", err)
}
if dirEnt.Ino != stat.Ino {
t.Fatalf("stat unexpectedly differs from dir ent: %#v %#v", dirEnt, stat)
}
count += 1
}
if count != COUNT {
t.Fatalf("unexpected count: %d", count)
}
}
func TestWriteDataOneChunk(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
testSizes := []uint64{0, 1, 3, CHUNK_SIZE - 1, CHUNK_SIZE}
for i, n := range testSizes {
name := fmt.Sprintf("d%d", i)
f, stat, err := fs.CreateFile(ROOT_INO, name, CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
data := make([]byte, n, n)
for j := 0; j < len(data); j += 1 {
data[j] = byte(j % 256)
}
nWritten, err := f.WriteData(data, 0)
if err != nil {
t.Fatal(err)
}
if nWritten != uint32(len(data)) {
t.Fatalf("unexpected write amount %d != %d", nWritten, len(data))
}
fetchedData, err := fs.ReadTransact(func(tx fdb.ReadTransaction) (interface{}, error) {
data := tx.Get(tuple.Tuple{"hafs", fs.fsName, "ino", stat.Ino, "data", 0}).MustGet()
zeroExpandChunk(&data)
return data, nil
})
if err != nil {
t.Fatal(err)
}
if len(fetchedData.([]byte)) != CHUNK_SIZE {
t.Fatalf("unexpected chunk size: %d", fetchedData)
}
if !bytes.Equal(data, fetchedData.([]byte)[:len(data)]) {
t.Fatalf("%v != %v", data, fetchedData)
}
}
}
func TestWriteDataTwoChunks(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
testSizes := []uint64{CHUNK_SIZE + 1, CHUNK_SIZE + 3, CHUNK_SIZE * 2}
for i, n := range testSizes {
name := fmt.Sprintf("d%d", i)
f, stat, err := fs.CreateFile(ROOT_INO, name, CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
data := make([]byte, n, n)
for j := 0; j < len(data); j += 1 {
data[j] = byte(j % 256)
}
data1 := data[:CHUNK_SIZE]
data2 := data[CHUNK_SIZE:]
nWritten := 0
for nWritten != len(data) {
n, err := f.WriteData(data[nWritten:], uint64(nWritten))
if err != nil {
t.Fatal(err)
}
nWritten += int(n)
}
fetchedData1, err := fs.ReadTransact(func(tx fdb.ReadTransaction) (interface{}, error) {
data := tx.Get(tuple.Tuple{"hafs", fs.fsName, "ino", stat.Ino, "data", 0}).MustGet()
zeroExpandChunk(&data)
return data, nil
})
if err != nil {
t.Fatal(err)
}
fetchedData2, err := fs.ReadTransact(func(tx fdb.ReadTransaction) (interface{}, error) {
data := tx.Get(tuple.Tuple{"hafs", fs.fsName, "ino", stat.Ino, "data", 1}).MustGet()
zeroExpandChunk(&data)
return data, nil
})
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(data1, fetchedData1.([]byte)[:len(data1)]) {
t.Fatalf("%v != %v", data, fetchedData1)
}
if !bytes.Equal(data2, fetchedData2.([]byte)[:len(data2)]) {
t.Fatalf("%v != %v", data, fetchedData2)
}
stat, err = fs.GetStat(stat.Ino)
if err != nil {
t.Fatal(err)
}
if stat.Size != uint64(len(data)) {
t.Fatalf("unexpected size - %d != %d", stat.Size, len(data))
}
}
}
func TestTruncate(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
testSizes := []uint64{
CHUNK_SIZE - 1,
CHUNK_SIZE + 1,
CHUNK_SIZE*2 - 1,
CHUNK_SIZE * 2,
CHUNK_SIZE*2 + 1,
}
for i, n := range testSizes {
name := fmt.Sprintf("d%d", i)
f, stat, err := fs.CreateFile(ROOT_INO, name, CreateFileOpts{
Mode: 0o777,
Uid: 0,
Gid: 0,
})
if err != nil {
t.Fatal(err)
}
data := make([]byte, n, n)
for j := 0; j < len(data); j += 1 {
data[j] = byte(j % 256)
}
nWritten := 0
for nWritten != len(data) {
n, err := f.WriteData(data[nWritten:], uint64(nWritten))
if err != nil {
t.Fatal(err)
}
nWritten += int(n)
}
_, err = fs.ModStat(stat.Ino, ModStatOpts{
Valid: MODSTAT_SIZE,
Size: 5,
})
if err != nil {
t.Fatal(err)
}
_, err = fs.ReadTransact(func(tx fdb.ReadTransaction) (interface{}, error) {
kvs := tx.GetRange(tuple.Tuple{"hafs", fs.fsName, "ino", stat.Ino, "data"}, fdb.RangeOptions{}).GetSliceOrPanic()
if len(kvs) != 1 {
t.Fatalf("bad number of data chunks: %d", len(kvs))
}
data := tx.Get(tuple.Tuple{"hafs", fs.fsName, "ino", stat.Ino, "data", 0}).MustGet()
zeroExpandChunk(&data)
if len(data) != CHUNK_SIZE {
t.Fatalf("bad data size: %d", len(data))
}
if !bytes.Equal(data[:5], []byte{0, 1, 2, 3, 4}) {
t.Fatalf("bad data: %v", data)
}
return nil, nil
})
if err != nil {
t.Fatal(err)
}
}
}
func TestReadWriteData(t *testing.T) {
t.Parallel()
fs := tmpFs(t)
// Random writes at different offsets to exercise the sparse code paths.
for i := 0; i < 100; i++ {
f, stat, err := fs.CreateFile(ROOT_INO, "f", CreateFileOpts{
Mode: 0o777,
})
if err != nil {
t.Fatal(err)
}
referenceFile, err := os.CreateTemp("", "")
if err != nil {
t.Fatal(err)
}
size := mathrand.Int()%(CHUNK_SIZE*3) + CHUNK_SIZE/2
nwrites := mathrand.Int() % 5
for i := 0; i < nwrites; i++ {
writeOffset := mathrand.Int() % size
writeSize := mathrand.Int() % (size - writeOffset)