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John-Mark Gurney
c31927eb86
Queue an initial fetch of data during attach and after every read
rather than synchronously fetching data and polling for completion.
If data has not been returned from an previous fetch during read,
just return EAGAIN rather than blocking.
Co-authored-by: John Baldwin <[email protected]>
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D41656
(cherry picked from commit f1c5a2e3a6)