ROMBSBITS
bh = sb_bread(sb, pos >> ROMBSBITS);
bh = sb_bread(sb, pos >> ROMBSBITS);
bh = sb_bread(sb, pos >> ROMBSBITS);
bh = sb_bread(sb, pos >> ROMBSBITS);
(romfs_maxsize(dentry->d_sb) + ROMBSIZE - 1) >> ROMBSBITS;