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Extract the shared walk+erase+unpin+kfree loop into ublk_shmem_remove_ranges(). When buf_index >= 0, only ranges matching that index are removed; when buf_index < 0, all ranges are removed. Also extract ublk_unpin_range_pages() to share the page unpinning loop. Convert both __ublk_ctrl_unreg_buf() and ublk_buf_cleanup() to use the new helper. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Link: https://patch.msgid.link/20260423033058.2805135-3-tom.leiming@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>