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Add loop_queue_shmem_zc_io() which handles I/O requests marked with UBLK_IO_F_SHMEM_ZC. When the kernel sets this flag, the request data lives in a registered shared memory buffer — decode index + offset from iod->addr and use the server's mmap as the I/O buffer. The dispatch check in loop_queue_tgt_rw_io() routes SHMEM_ZC requests to this new function, bypassing the normal buffer registration path. Signed-off-by: Ming Lei <ming.lei@redhat.com> Link: https://patch.msgid.link/20260331153207.3635125-7-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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