If a (poorly coded) app reaches the maximum number of files or folders per directory in Linux, you may see errors like this:
Error happened when generating Download Link. Please try again or Contact administrator. (ERROR:mkdir)
A quick and dirty way to increase the limit (and overall performance of the system) is to add the dir_index flag to the ext filesystem, then reindex:
tune2fs -O dir_index /dev/sda3 updatedb &
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