uml/hostfs: Propagate dirent.d_type to filldir()

Currently the (optional) d_type member in struct dirent is always
DT_UNKNOWN on hostfs, which may confuse buggy software using readdir().
Make sure to propagate its value from the underlying filesystem if it's
available there.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/hostfs/hostfs.h

@@ -67,7 +67,8 @@ extern int access_file(char *path, int r, int w, int x);
 extern int open_file(char *path, int r, int w, int append);
 extern void *open_dir(char *path, int *err_out);
 extern char *read_dir(void *stream, unsigned long long *pos,
-		      unsigned long long *ino_out, int *len_out);
+		      unsigned long long *ino_out, int *len_out,
+		      unsigned int *type_out);
 extern void close_file(void *stream);
 extern int replace_file(int oldfd, int fd);
 extern void close_dir(void *stream);

fs/hostfs/hostfs_kern.c

@@ -283,6 +283,7 @@ int hostfs_readdir(struct file *file, void *ent, filldir_t filldir)
 	char *name;
 	unsigned long long next, ino;
 	int error, len;
+	unsigned int type;
 
 	name = dentry_name(file->f_path.dentry);
 	if (name == NULL)
@@ -292,9 +293,9 @@ int hostfs_readdir(struct file *file, void *ent, filldir_t filldir)
 	if (dir == NULL)
 		return -error;
 	next = file->f_pos;
-	while ((name = read_dir(dir, &next, &ino, &len)) != NULL) {
+	while ((name = read_dir(dir, &next, &ino, &len, &type)) != NULL) {
 		error = (*filldir)(ent, name, len, file->f_pos,
-				   ino, DT_UNKNOWN);
+				   ino, type);
 		if (error) break;
 		file->f_pos = next;
 	}

fs/hostfs/hostfs_user.c

@@ -98,7 +98,8 @@ void *open_dir(char *path, int *err_out)
 }
 
 char *read_dir(void *stream, unsigned long long *pos,
-	       unsigned long long *ino_out, int *len_out)
+	       unsigned long long *ino_out, int *len_out,
+	       unsigned int *type_out)
 {
 	DIR *dir = stream;
 	struct dirent *ent;
@@ -109,6 +110,7 @@ char *read_dir(void *stream, unsigned long long *pos,
 		return NULL;
 	*len_out = strlen(ent->d_name);
 	*ino_out = ent->d_ino;
+	*type_out = ent->d_type;
 	*pos = telldir(dir);
 	return ent->d_name;
 }