isn't so much how to notify reusability, but rather when to determine the safety of doing so. We still need to change a bit of infrastructure for this - eg, get rid of ->sendpage() and actually pass the pipe_inode_info down for network transmit and only have it do the ->release on the buffers when they have been sent out. The issue right now is that the ->release is done as soon as we pass the page to the network stack, which is too soon of course.
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