[PATCH V5 08/16] block: ublk_drv: add two helpers to clean up map/unmap request

Ming Lei
2023-03-28T15:21:33Z

Add two helpers for checking if map/unmap is needed, since we may have
passthrough request which needs map or unmap in future, such as for
supporting report zones.

Meantime don't mark ublk_copy_user_pages as inline since this function
is a bit fat now.

Reviewed-by: Ziyang Zhang <ZiyangZhang@linux.alibaba.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/block/ublk_drv.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index c73b2dba25ce..f87597a7d679 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -488,8 +488,7 @@ static inline unsigned ublk_copy_io_pages(struct ublk_io_iter *data,
return done;
}

-static inline int ublk_copy_user_pages(struct ublk_map_data *data,
- bool to_vm)
+static int ublk_copy_user_pages(struct ublk_map_data *data, bool to_vm)
{
const unsigned int gup_flags = to_vm ? FOLL_WRITE : 0;
const unsigned long start_vm = data->io->addr;
@@ -525,6 +524,16 @@ static inline int ublk_copy_user_pages(struct ublk_map_data *data,
return done;
}

+static inline bool ublk_need_map_req(const struct request *req)
+{
+ return ublk_rq_has_data(req) && req_op(req) == REQ_OP_WRITE;
+}
+
+static inline bool ublk_need_unmap_req(const struct request *req)
+{
+ return ublk_rq_has_data(req) && req_op(req) == REQ_OP_READ;
+}
+
static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
struct ublk_io *io)
{
@@ -535,7 +544,7 @@ static int ublk_map_io(const struct ublk_queue *ubq, const struct request *req,
* context and the big benefit is that pinning pages in current
* context is pretty fast, see ublk_pin_user_pages
*/
- if (ublk_rq_has_data(req) && req_op(req) == REQ_OP_WRITE) {
+ if (ublk_need_map_req(req)) {
struct ublk_map_data data = {
.ubq = ubq,
.rq = req,
@@ -556,7 +565,7 @@ static int ublk_unmap_io(const struct ublk_queue *ubq,
{
const unsigned int rq_bytes = blk_rq_bytes(req);

- if (req_op(req) == REQ_OP_READ && ublk_rq_has_data(req)) {
+ if (ublk_need_unmap_req(req)) {
struct ublk_map_data data = {
.ubq = ubq,
.rq = req,
@@ -772,7 +781,7 @@ static inline void __ublk_rq_task_work(struct request *req,
return;
}

- if (ublk_need_get_data(ubq) && (req_op(req) == REQ_OP_WRITE)) {
+ if (ublk_need_get_data(ubq) && ublk_need_map_req(req)) {
/*
* We have not handled UBLK_IO_NEED_GET_DATA command yet,
* so immepdately pass UBLK_IO_RES_NEED_GET_DATA to ublksrv
--
2.39.2