lblktosize
#define lblktosize(imp, blk) ((blk) << (imp)->im_bshift)
#define lblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \
#define lblktosize(udfmp, blk) ((blk) << (udfmp)->bshift)
#define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \