FS_DYNAMICPOSTBLFMT
case FS_DYNAMICPOSTBLFMT:
sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT;
sblock->fs_old_postblformat = FS_DYNAMICPOSTBLFMT;
if (sb->fs_old_postblformat < FS_DYNAMICPOSTBLFMT)
sblock.fs_old_postblformat = FS_DYNAMICPOSTBLFMT;