On Wed, Sep 08, 2021 at 09:10:17AM -0400, Emanuele Giuseppe Esposito wrote: > Currently, block layer APIs like block-backend.h contain a mix of > functions that are either running in the main loop and under the > BQL, or are thread-safe functions and run in iothreads performing I/O. > The functions running under BQL also take care of modifying the > block graph, by using drain and/or aio_context_acquire/release. > This makes it very confusing to understand where each function > runs, and what assumptions it provided with regards to thread > safety. > > We call the functions running under BQL "graph API", and > distinguish them from the thread-safe "I/O API".
Maybe "BQL" is clearer than "graph" because not all functions classified as "graph" need to traverse/modify the graph. Stefan
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