codes.InvalidArgument when PageSize < 0

[glimchb]

Fixes #298

Signed-off-by: Boris Glimcher Boris.Glimcher@emc.com

[codecov]

Codecov Report

Merging #305 (6ebaf05) into main (81f602f) will increase coverage by 0.15%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   71.63%   71.78%   +0.15%     
==========================================
  Files          14       14              
  Lines        1745     1790      +45     
==========================================
+ Hits         1250     1285      +35     
- Misses        449      459      +10     
  Partials       46       46              

Impacted Files	Coverage Δ
pkg/frontend/scsi.go	0.00% <0.00%> (ø)
pkg/backend/aio.go	93.06% <100.00%> (+0.20%)	⬆️
pkg/backend/null.go	93.06% <100.00%> (+0.20%)	⬆️
pkg/backend/nvme.go	88.61% <100.00%> (+0.48%)	⬆️
pkg/frontend/blk.go	88.69% <100.00%> (+0.51%)	⬆️
pkg/frontend/nvme.go	84.57% <100.00%> (+0.36%)	⬆️
pkg/middleend/middleend.go	92.07% <100.00%> (+0.17%)	⬆️

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