ublk: don't access ublk_queue in ublk_daemon_register_io_buf()

For ublk servers with many ublk queues, accessing the ublk_queue in
ublk_daemon_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 751ec62655f893838c86b477dad5b2fd0d14edc5..266b46d408866b16edcbbf30d83e570d1e22929e 100644 (file)
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -2169,7 +2169,7 @@ ublk_daemon_register_io_buf(struct io_uring_cmd *cmd,
                return ublk_register_io_buf(cmd, ub, ubq, io, index,
                                            issue_flags);
 
-       if (!ublk_support_zero_copy(ubq) || !ublk_rq_has_data(req))
+       if (!ublk_dev_support_zero_copy(ub) || !ublk_rq_has_data(req))
                return -EINVAL;
 
        ret = io_buffer_register_bvec(cmd, req, ublk_io_release, index,