bsg: add io_uring command support for SCSI passthrough#616
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March 15, 2026 17:03
Add the bsg_uring_cmd structure to the BSG UAPI header to support io_uring-based SCSI passthrough operations via IORING_OP_URING_CMD. Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Add an io_uring command handler to the generic BSG layer. The new .uring_cmd file operation validates io_uring features and delegates handling to a per-queue bsg_uring_cmd_fn callback. Extend bsg_register_queue() so transport drivers can register both sg_io and io_uring command handlers. Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
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Implement the SCSI-specific io_uring command handler for BSG using struct bsg_uring_cmd. The handler builds a SCSI request from the io_uring command, maps user buffers (including fixed buffers), and completes asynchronously via a request end_io callback and task_work. Completion returns a 32-bit status and packed residual/sense information via CQE res and res2, and supports IO_URING_F_NONBLOCK. Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
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Pull request for series with
subject: bsg: add io_uring command support for SCSI passthrough
version: 5
url: https://patchwork.kernel.org/project/linux-block/list/?series=1061094