ublk: don't access ublk_queue in ublk_register_io_buf()

For ublk servers with many ublk queues, accessing the ublk_queue in
ublk_register_io_buf() is a frequent cache miss. Get the flags from the
ublk_device instead, which is accessed earlier in
ublk_ch_uring_cmd_local().

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index cb51f3f3cd33d8f85c53ce554c184034cd3b086e..751ec62655f893838c86b477dad5b2fd0d14edc5 100644 (file)
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -2133,7 +2133,7 @@ static int ublk_register_io_buf(struct io_uring_cmd *cmd,
        struct request *req;
        int ret;
 
-       if (!ublk_support_zero_copy(ubq))
+       if (!ublk_dev_support_zero_copy(ub))
                return -EINVAL;
 
        req = __ublk_check_and_get_req(ub, ubq, io, 0);