e50a6a57e5
The Readdir function provided by os is inherently slow because it calls Lstat on all files. Getdents gives us all the information we need, but does not have a proper wrapper in the stdlib. Implement the "Getdents()" wrapper function that calls syscall.Getdents() and parses the returned byte blob to a fuse.DirEntry slice.
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
// +build linux
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package syscallcompat
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import (
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"io/ioutil"
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"os"
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"strings"
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"syscall"
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"testing"
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"github.com/hanwen/go-fuse/fuse"
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)
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func TestGetdents(t *testing.T) {
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// Fill a directory with filenames of length 1 ... 255
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testDir, err := ioutil.TempDir("", "TestGetdents")
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if err != nil {
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t.Fatal(err)
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}
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for i := 1; i <= syscall.NAME_MAX; i++ {
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n := strings.Repeat("x", i)
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err = ioutil.WriteFile(testDir+"/"+n, nil, 0600)
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if err != nil {
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t.Fatal(err)
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}
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}
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// "/", "/dev" and "/proc" are good test cases because they contain many
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// different file types (block and char devices, symlinks, mountpoints)
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dirs := []string{testDir, "/", "/dev", "/proc"}
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for _, dir := range dirs {
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// Read directory using stdlib Readdir()
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fd, err := os.Open(dir)
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if err != nil {
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t.Fatal(err)
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}
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readdirEntries, err := fd.Readdir(0)
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if err != nil {
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t.Fatal(err)
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}
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fd.Close()
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readdirMap := make(map[string]*syscall.Stat_t)
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for _, v := range readdirEntries {
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readdirMap[v.Name()] = fuse.ToStatT(v)
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}
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// Read using our Getdents()
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getdentsEntries, err := Getdents(dir)
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if err != nil {
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t.Fatal(err)
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}
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getdentsMap := make(map[string]fuse.DirEntry)
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for _, v := range getdentsEntries {
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getdentsMap[v.Name] = v
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}
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// Compare results
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if len(getdentsEntries) != len(readdirEntries) {
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t.Fatalf("len(getdentsEntries)=%d, len(readdirEntries)=%d",
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len(getdentsEntries), len(readdirEntries))
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}
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for name := range readdirMap {
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g := getdentsMap[name]
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r := readdirMap[name]
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rTyp := r.Mode & syscall.S_IFMT
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if g.Mode != rTyp {
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t.Errorf("%q: g.Mode=%#o, r.Mode=%#o", name, g.Mode, rTyp)
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}
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if g.Ino != r.Ino {
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// The inode number of a directory that is reported by stat
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// and getdents is different when it is a mountpoint. Only
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// throw an error when we are NOT looking at a directory.
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if g.Mode != syscall.S_IFDIR {
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t.Errorf("%s: g.Ino=%d, r.Ino=%d", name, g.Ino, r.Ino)
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}
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}
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}
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}
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}
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