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ming1
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Feb 1, 2026
ming1
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- support UBLK_F_BATCH_IO feature
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Add support for batch IO mode which uses batch-based operations instead of per-tag FETCH/COMMIT_AND_FETCH: - UBLK_U_IO_PREP_IO_CMDS: One-time prep with buffer info - UBLK_U_IO_FETCH_IO_CMDS: Multishot fetch returning 2-byte tags - UBLK_U_IO_COMMIT_IO_CMDS: Batch commit of completed IOs Key implementation details: - Add batch structures (ublk_batch_elem, batch_commit_buf, batch_fetch_buf) - Extend _ublksrv_queue with batch IO fields for double-buffered fetch and commit operations - Implement io_uring buffer rings for multishot fetch commands - Add UBLKSRV_QUEUE_BATCH_IO queue state flag - Handle multishot command completion correctly: only decrement cmd_inflight when command truly ends (no IORING_CQE_F_MORE or error) The batch mode is transparent to targets - ublksrv_complete_io() routes internally to batch commit buffers when UBLK_F_BATCH_IO is set. Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Add command line option to enable UBLK_F_BATCH_IO mode: - Add -b short option and --batch-io long option - Check kernel feature support before enabling - Update help text to document the new option Signed-off-by: Ming Lei <tom.leiming@gmail.com>
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