On Sun, Sep 19 2021 at 10:56:45 AM -0400, Benjamin LaHaise 
[off-list ref] wrote:

You're doing this wrong.  If you want faster cancellations, stash an 
index
into iocb->aio_key to index into an array with all requests rather 
than
using a hash table.

Would that not mean that, we would have to keep track of the indices of 
the
array that are not being held by an `aio_kiocb`?