what's the meaning of CEPH_OSD_ALLOC_HINT_FLAG_IMMUTABLE flag?

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hello,

Could you kindly explain what's the meaning of
CEPH_OSD_ALLOC_HINT_FLAG_IMMUTABLE flag?

I think it means the corresponding object's data part(not include
attrs) cannot be modified after the initial write.
However, the object can be overwritten by write_full().

thx,

Yang Honggang
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