ovl_fb
bytes = (fh->fb.len - offsetof(struct ovl_fb, fid));
if (index->d_name.len < sizeof(struct ovl_fb)*2)
int ovl_check_fb_len(struct ovl_fb *fb, int fb_len)
if (fb_len < sizeof(struct ovl_fb) || fb_len < fb->len)
struct ovl_fb fb;
offsetof(struct ovl_fb, fid))
int ovl_check_fb_len(struct ovl_fb *fb, int fb_len);