services: Promote values into struct instead of metadata

[Xuanwo]

No description provided.

[codecov]

Codecov Report

Merging #33 into master will increase coverage by 0.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #33     +/-   ##
=========================================
+ Coverage   77.74%   77.94%   +0.2%     
=========================================
  Files           9        9             
  Lines         975      975             
=========================================
+ Hits          758      760      +2     
+ Misses        140      139      -1     
+ Partials       77       76      -1

Impacted Files	Coverage Δ
services/posixfs/utils.go	80.95% <ø> (ø)	⬆️
services/qingstor/utils.go	100% <100%> (ø)	⬆️
services/qingstor/storager.go	78.33% <100%> (+0.37%)	⬆️
services/posixfs/storager.go	92.3% <100%> (ø)	⬆️

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