bsg: add io_uring command support for SCSI passthrough #495
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added 3 commits
January 16, 2026 13:36
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 io_uring command handler to the generic BSG layer. This handler validates that SQE128 and CQE32 flags are set (required for the command structure and status information), then delegates to the SCSI-specific handler. Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Implement the SCSI-specific io_uring command handler for BSG. This handler processes SCSI passthrough commands asynchronously via io_uring, supporting both traditional user buffers and zero-copy fixed buffers. Key features: - Async command execution with proper completion handling - Zero-copy support via io_uring fixed buffers - Status information returned in CQE res2 field - Non-blocking I/O support via IO_URING_F_NONBLOCK - Proper error handling and validation The implementation uses a PDU structure overlaying io_uring_cmd.pdu[32] to store temporary state during command execution. Completion is handled via task work to safely access user space. This patch replaces the stub implementation from patch 2/3 with the full implementation. Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
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Pull request for series with
subject: bsg: add bsg_uring_cmd uapi structure
version: 3
url: https://patchwork.kernel.org/project/linux-block/list/?series=1043116