Hello, The 1st 3 patch are cleanup. The other patches supports to move data copy between io request pages and userspace buffer into ublk server(userspace). This way avoids one round trip of uring command(UBLK_F_NEED_GET_DATA), and solve buffer release issue for READ. Meantime both sides becomes cleaner. Also it can be thought as prep patch for supporting zero copy. Ming Lei (7): ublk: kill queuing request by task_work_add ublk: cleanup io cmd code path by adding ublk_fill_io() ublk: cleanup ublk_copy_user_pages ublk: grab request reference when the request is handled by userspace ublk: support to copy any part of request pages ublk: add read()/write() support for ublk char device ublk: support user copy drivers/block/ublk_drv.c | 457 +++++++++++++++++++++++++--------- include/uapi/linux/ublk_cmd.h | 25 +- 2 files changed, 361 insertions(+), 121 deletions(-) -- 2.39.2
