f_blksize
size_t f_blksize[NIADDR]; /* size of buffer */
&fp->f_blksize[level]);
if (fp->f_blksize[level] != fs->fs_bsize)
int f_blksize; /* stat.st_blksize (may be != bf.size) */
fp->f_blksize = st.st_blksize;
curoff = target & ~(fp->f_blksize - 1);
fp->f_blksize = st.st_blksize;