Searched hist:"62 fe99cef94a5900cac3bf15fd03ee8baad1a99c" (Results 1 – 2 of 2) sorted by last modified time
| /linux/drivers/block/ |
| H A D | ublk_drv.c | diff 62fe99cef94a5900cac3bf15fd03ee8baad1a99c Fri May 19 08:50:29 CEST 2023 Ming Lei <ming.lei@redhat.com> ublk: add read()/write() support for ublk char device
Support pread()/pwrite() on ublk char device for reading/writing request
io buffer, so data copy between io request buffer and userspace buffer
can be moved to ublk server from ublk driver. Then UBLK_F_NEED_GET_DATA
becomes not necessary, so ublk server can allocate buffer without one
extra round uring command communication for userspace to provide buffer.
IO buffer can be located by iocb->ki_pos which encodes buffer offset, io
tag and queue id info, and type of iocb->ki_pos is u64, so it is big
enough for holding reasonable queue depth, nr_queues and max io buffer
size.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230519065030.351216-7-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|
| /linux/include/uapi/linux/ |
| H A D | ublk_cmd.h | diff 62fe99cef94a5900cac3bf15fd03ee8baad1a99c Fri May 19 08:50:29 CEST 2023 Ming Lei <ming.lei@redhat.com> ublk: add read()/write() support for ublk char device
Support pread()/pwrite() on ublk char device for reading/writing request
io buffer, so data copy between io request buffer and userspace buffer
can be moved to ublk server from ublk driver. Then UBLK_F_NEED_GET_DATA
becomes not necessary, so ublk server can allocate buffer without one
extra round uring command communication for userspace to provide buffer.
IO buffer can be located by iocb->ki_pos which encodes buffer offset, io
tag and queue id info, and type of iocb->ki_pos is u64, so it is big
enough for holding reasonable queue depth, nr_queues and max io buffer
size.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230519065030.351216-7-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
|