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package posixtest
import (
"fmt"
"io/ioutil"
"os"
"syscall"
"testing"
"unsafe"
"golang.org/x/sys/unix"
)
// DirSeek tests that seeking on a directory works for
// https://github.com/hanwen/go-fuse/issues/344 .
//
// Go port of xfstests generic/257.
//
// Hint:
// $ go test ./fs -run TestPosix/DirSeek -v
func DirSeek(t *testing.T, mnt string) {
// From bash script xfstests/tests/generic/257
ttt := mnt + "/ttt"
err := os.Mkdir(ttt, 0700)
if err != nil {
t.Fatal(err)
}
for i := 1; i <= 168; i++ {
path := fmt.Sprintf("%s/%d", ttt, i)
err = ioutil.WriteFile(path, nil, 0600)
if err != nil {
t.Fatal(err)
}
}
// From C app xfstests/src/t_dir_offset2.c
const bufSize = 4096
const historyLen = 1024
offHistory := make([]int64, historyLen)
inoHistory := make([]uint64, historyLen)
buf := make([]byte, bufSize)
fd, err := syscall.Open(ttt, syscall.O_RDONLY|syscall.O_DIRECTORY, 0)
if err != nil {
t.Fatal(err)
}
defer syscall.Close(fd)
total := 0
for {
n, err := unix.Getdents(fd, buf)
if err != nil {
t.Fatal(err)
}
if n == 0 {
break
}
for bpos := 0; bpos < n; total++ {
d := (*unix.Dirent)(unsafe.Pointer(&buf[bpos]))
if total > historyLen {
t.Fatal("too many files")
}
for i := 0; i < total; i++ {
if offHistory[i] == d.Off {
t.Errorf("entries %d and %d gave duplicate d.Off %d",
i, total, d.Off)
}
}
offHistory[total] = d.Off
inoHistory[total] = d.Ino
bpos += int(d.Reclen)
}
}
// check if seek works correctly
d := (*unix.Dirent)(unsafe.Pointer(&buf[0]))
for i := total - 1; i >= 0; i-- {
var seekTo int64
if i > 0 {
seekTo = offHistory[i-1]
}
_, err = unix.Seek(fd, seekTo, os.SEEK_SET)
if err != nil {
t.Fatal(err)
}
n, err := unix.Getdents(fd, buf)
if err != nil {
t.Fatal(err)
}
if n == 0 {
t.Errorf("getdents returned 0 on entry %d", i)
continue
}
if d.Ino != inoHistory[i] {
t.Errorf("entry %d has inode %d, expected %d",
i, d.Ino, inoHistory[i])
}
}
}
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