ublk: allow non-blocking ctrl cmds in IO_URING_F_NONBLOCK issue #414
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Upstream branch: c2f2b01 |
Author
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Upstream branch: c2f2b01 |
Handling most of the ublksrv_ctrl_cmd opcodes require locking a mutex, so ublk_ctrl_uring_cmd() bails out with EAGAIN when called with the IO_URING_F_NONBLOCK issue flag. However, several opcodes can be handled without blocking: - UBLK_CMD_GET_QUEUE_AFFINITY - UBLK_CMD_GET_DEV_INFO - UBLK_CMD_GET_DEV_INFO2 - UBLK_U_CMD_GET_FEATURES Handle these opcodes synchronously instead of returning EAGAIN so io_uring doesn't need to issue the command via the worker thread pool. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com>
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Pull request for series with
subject: ublk: allow non-blocking ctrl cmds in IO_URING_F_NONBLOCK issue
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1029437