syscallcompat: add GetdentsSpecial()

GetdentsSpecial calls then Getdents syscall,
with normal entries and "." / ".." split into two slices.

1 files changed, 31 insertions, 19 deletions

diff --git a/internal/syscallcompat/getdents_other.go b/internal/syscallcompat/getdents_other.go
index 82932db..1ed5ecf 100644
--- a/internal/syscallcompat/getdents_other.go
+++ b/internal/syscallcompat/getdents_other.go
@@ -9,27 +9,11 @@ import (
 	"github.com/hanwen/go-fuse/v2/fuse"
 )
 
-// emulateGetdents reads all directory entries from the open directory "fd"
-// and returns them in a fuse.DirEntry slice.
-func emulateGetdents(fd int) (out []fuse.DirEntry, err error) {
-	// os.File closes the fd in its finalizer. Duplicate the fd to not affect
-	// the original fd.
-	newFd, err := syscall.Dup(fd)
-	if err != nil {
-		return nil, err
-	}
-	f := os.NewFile(uintptr(newFd), "")
-	defer f.Close()
-	// Get all file names in the directory
-	names, err := f.Readdirnames(0)
-	if err != nil {
-		return nil, err
-	}
-	// Stat all of them and convert to fuse.DirEntry
-	out = make([]fuse.DirEntry, 0, len(names))
+func fillDirEntries(fd int, names []string) ([]fuse.DirEntry, error) {
+	out := make([]fuse.DirEntry, 0, len(names))
 	for _, name := range names {
 		var st unix.Stat_t
-		err = Fstatat(fd, name, &st, unix.AT_SYMLINK_NOFOLLOW)
+		err := Fstatat(fd, name, &st, unix.AT_SYMLINK_NOFOLLOW)
 		if err == syscall.ENOENT {
 			// File disappeared between readdir and stat. Pretend we did not
 			// see it.
@@ -47,3 +31,31 @@ func emulateGetdents(fd int) (out []fuse.DirEntry, err error) {
 	}
 	return out, nil
 }
+
+// emulateGetdents reads all directory entries from the open directory "fd"
+// and returns normal entries and "." / ".." split into two slices.
+func emulateGetdents(fd int) (out []fuse.DirEntry, outSpecial []fuse.DirEntry, err error) {
+	// os.File closes the fd in its finalizer. Duplicate the fd to not affect
+	// the original fd.
+	newFd, err := syscall.Dup(fd)
+	if err != nil {
+		return nil, nil, err
+	}
+	f := os.NewFile(uintptr(newFd), "")
+	defer f.Close()
+	// Get all file names in the directory
+	names, err := f.Readdirnames(0)
+	if err != nil {
+		return nil, nil, err
+	}
+	// Stat all the names and convert to fuse.DirEntry
+	out, err = fillDirEntries(fd, names)
+	if err != nil {
+		return nil, nil, err
+	}
+	outSpecial, err = fillDirEntries(fd, []string{".", ".."})
+	if err != nil {
+		return nil, nil, err
+	}
+	return out, outSpecial, nil
+}