flush the source file of copy_file_range

[davies]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 36.40%. Comparing base (83b2ba2) to head (62b9730).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/vfs/vfs.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4436       +/-   ##
===========================================
- Coverage   56.01%   36.40%   -19.62%     
===========================================
  Files         154      120       -34     
  Lines       40134    31496     -8638     
===========================================
- Hits        22483    11465    -11018     
- Misses      15133    18855     +3722     
+ Partials     2518     1176     -1342     

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