CRAMFS_NAMELEN_WIDTH   25 include/linux/cramfs_fs.h #define CRAMFS_MAXPATHLEN (((1 << CRAMFS_NAMELEN_WIDTH) - 1) << 2)
CRAMFS_NAMELEN_WIDTH   42 include/linux/cramfs_fs.h 	__u32 namelen:CRAMFS_NAMELEN_WIDTH, offset:CRAMFS_OFFSET_WIDTH;