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d507d3cb19
Batch AUTO_BUF_REG COMMIT must unregister the old auto_buf index before storing the next one. Fixed per-tag indexing (A == B) masks bugs that clear after overwriting io->buf. Add kublk --rotate_auto_buf so each tag alternates between two sparse buffer indices, and test_batch_04.sh to exercise that path. Without the driver fix, the request ref stays stuck and I/O hangs; the test uses a short timeout and kills the ublk daemon to recover. With the fix, a small write completes quickly. Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn> Reviewed-by: Ming Lei <tom.leiming@gmail.com> Link: https://patch.msgid.link/20260730024050.1062354-1-yangxiuwei@kylinos.cn Signed-off-by: Jens Axboe <axboe@kernel.dk>