Make file_upload_handler stop early when low disk space #4038
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Description of the Change
Currently file_upload_handler stops accepting new uploads when there is less than 1MB free disk space. That is too late as multiple concurrent writes can hit the disk limits, so increasing this limit to 1GB and making it configurable instead of using a hardcoded constant.
Alternate Designs
Could also read from config file, but this would entail more disk accesses where they aren't really needed.
Release Notes
Make file_upload_handler stop accepting uploads early when low disk space