Hm - SendData implementation was far easier than originally feared. Just pushed a new commit.

In general, reviewing the code again:

• mmap-based reads are disabled when throttles are loaded.
• Old-style sendfile-based reads are disabled. New-style, SendData-based reads should work and be throttled correctly.
• Asynchronous IO requests are converted to synchronous IO in order to be throttled.

So - unless I missed something - when the throttle is loaded, all reads mechanisms are properly accounted for or disabled.

For reference, in order to enable this plugin, you need to do:
xrootd.fslib throttle default
throttle.throttle concurrency 10 data 10485760
throttle.trace all

Line 1 enables the throttle; line 2 sets the throttles to 10 outstanding IO requests and 10MB/s of data; line 3 enables all possible debugging.

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