rust: block: add a borrowed blk-mq timeout callback#733
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Add a typed TimeoutReturn enum for blk-mq timeout handlers and extend the Operations trait with an optional timeout callback. The new callback borrows Request instead of taking an ARef because timeout is a synchronous notification from blk-mq and does not transfer request ownership to the driver. Wire the callback into OperationsVTable and keep drivers that do not implement timeout on the existing timeout: None path. Signed-off-by: Wenzhao Liao <[email protected]>
Implement the new Operations::timeout callback for rnull and return TimeoutReturn::ResetTimer. Using ResetTimer keeps the behavior close to the existing blk-mq default timeout handling while proving that the Rust timeout abstraction wires cleanly into a driver. Signed-off-by: Wenzhao Liao <[email protected]>
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Pull request for series with
subject: rust: block: add a borrowed blk-mq timeout callback
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1079859