Write back-pressure support

[fafhrd91]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.62595% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 71.24%. Comparing base (0b65b30) to head (688b1d6).

Files	Patch %	Lines
src/io.rs	86.66%	14 Missing ⚠️
src/v3/control.rs	36.36%	7 Missing ⚠️
src/v5/control.rs	30.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #172      +/-   ##
==========================================
+ Coverage   71.10%   71.24%   +0.13%     
==========================================
  Files          52       52              
  Lines        8684     8738      +54     
==========================================
+ Hits         6175     6225      +50     
- Misses       2509     2513       +4     

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