[Enhancement]: don't unlink file after mmap, let local chunk manager can got real disk usage.

[chyezh]

Is there an existing issue for this?

• I have searched the existing issues

What would you like to be added?

After mmap, all file is unlinked but still use the disk space.
So local chunk manager can not get real disk usage.
move the unlink operation into destructor of some entity can avoid it.

Why is this needed?

No response

Anything else?

No response

[stale]

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