syscallcompat: Getdents: warn once if we get DT_UNKNOWN

...and if Getdents is not available at all.

Due to this warning I now know that SSHFS always returns DT_UNKNOWN:

    gocryptfs[8129]: Getdents: convertDType: received DT_UNKNOWN, falling back to Lstat

This behavoir is confirmed at http://ahefner.livejournal.com/16875.html:

    "With sshfs, I finally found that obscure case. The dtype is always set to DT_UNKNOWN [...]"
libgocryptfs
Jakob Unterwurzacher 5 years ago
parent a710451d92
commit 538cae610c
  1. 6
      internal/fusefrontend/fs_dir.go
  2. 6
      internal/syscallcompat/getdents_linux.go

@ -7,6 +7,7 @@ import (
"io"
"os"
"path/filepath"
"sync"
"syscall"
"github.com/hanwen/go-fuse/fuse"
@ -234,6 +235,8 @@ func (fs *FS) Rmdir(path string, context *fuse.Context) (code fuse.Status) {
return fuse.OK
}
var haveGetdentsWarnOnce sync.Once
// OpenDir implements pathfs.FileSystem
func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, fuse.Status) {
tlog.Debug.Printf("OpenDir(%s)", dirName)
@ -252,6 +255,9 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
return nil, fuse.ToStatus(err)
}
} else {
haveGetdentsWarnOnce.Do(func() {
tlog.Warn.Printf("OpenDir: Getdents not available, falling back to OpenDir")
})
cipherEntries, status = fs.FileSystem.OpenDir(cDirName, context)
if !status.Ok() {
return nil, status

@ -8,6 +8,7 @@ package syscallcompat
import (
"bytes"
"sync"
"syscall"
"unsafe"
@ -121,6 +122,8 @@ func getdentsName(s syscall.Dirent) (string, error) {
return string(name), nil
}
var dtUnknownWarnOnce sync.Once
// convertDType converts a Dirent.Type to at Stat_t.Mode value.
func convertDType(dtype uint8, file string) (uint32, error) {
if dtype != syscall.DT_UNKNOWN {
@ -128,6 +131,9 @@ func convertDType(dtype uint8, file string) (uint32, error) {
return uint32(dtype) << 12, nil
}
// DT_UNKNOWN: we have to call Lstat()
dtUnknownWarnOnce.Do(func() {
tlog.Warn.Printf("Getdents: convertDType: received DT_UNKNOWN, falling back to Lstat")
})
var st syscall.Stat_t
err := syscall.Lstat(file, &st)
if err != nil {

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