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Implement NUMA-friendly memory allocation for ublk driver to improve performance on multi-socket systems. This commit includes the following changes: 1. Rename __queues to queues, dropping the __ prefix since the field is now accessed directly throughout the codebase rather than only through the ublk_get_queue() helper. 2. Remove the queue_size field from struct ublk_device as it is no longer needed. 3. Move queue allocation and deallocation into ublk_init_queue() and ublk_deinit_queue() respectively, improving encapsulation. This simplifies ublk_init_queues() and ublk_deinit_queues() to just iterate and call the per-queue functions. 4. Add ublk_get_queue_numa_node() helper function to determine the appropriate NUMA node for a queue by finding the first CPU mapped to that queue via tag_set.map[HCTX_TYPE_DEFAULT].mq_map[] and converting it to a NUMA node using cpu_to_node(). This function is called internally by ublk_init_queue() to determine the allocation node. 5. Allocate each queue structure on its local NUMA node using kvzalloc_node() in ublk_init_queue(). 6. Allocate the I/O command buffer on the same NUMA node using alloc_pages_node(). This reduces memory access latency on multi-socket NUMA systems by ensuring each queue's data structures are local to the CPUs that access them. Reviewed-by: Caleb Sander Mateos <csander@purestorage.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>