jffs2_sum_xattr_flash
struct jffs2_sum_xattr_flash *spx;
spx = (struct jffs2_sum_xattr_flash *)sp;
struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
struct jffs2_sum_xattr_flash x;