的输出xfs_info如下：
meta-data=/dev/mapper/vg0-mirror.sjtug isize=512 agcount=13, agsize=268435455 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1 spinodes=0 rmapbt=0
= reflink=0
data = bsize=4096 blocks=3417184256, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=521728, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
我想知道这里是什么spinodes意思？似乎关于它的信息很少。