As Raghavendra Gowdappa have said, when the preload (a readdir request not
initiated by application, but instead triggered by readdir-ahead in an attempt
to pre-emptively fill the read-ahead buffer) is in progress, a readdir request
from application waits for its completion. In the code, when the preload is in
progress,it locks the ctx. For applications, the readdir-ahead's request
processing is synchronous, is it possible that the preload handles request
asynchronously by reducing lock granularity?
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