From: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
if io_uring sends passthrough command with IORING_URING_CMD_FIXED flag,
use the pre-registered buffer for IO (non-vectored variant). Pass the
buffer/length to io_uring and get the bvec iterator for the range. Next,
pass this bvec to block-layer and obtain a bio/request for subsequent
processing.
Signed-off-by: Kanchan Joshi <joshi.k@xxxxxxxxxxx>
---
drivers/nvme/host/ioctl.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 7a41caa9bfd2..81f5550b670d 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -95,8 +95,22 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
void *meta = NULL;
int ret;
- ret = blk_rq_map_user_io(req, NULL, nvme_to_user_ptr(ubuffer), bufflen,
- GFP_KERNEL, vec, 0, 0, rq_data_dir(req));
+ if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) {
+ struct iov_iter iter;
+
+ /* fixedbufs is only for non-vectored io */
+ if (WARN_ON_ONCE(vec))
+ return -EINVAL;
+ ret = io_uring_cmd_import_fixed(ubuffer, bufflen,
+ rq_data_dir(req), &iter, ioucmd);
+ if (ret < 0)
+ goto out;
+ ret = blk_rq_map_user_iov(q, req, NULL, &iter, GFP_KERNEL);
+ } else {
+ ret = blk_rq_map_user_io(req, NULL, nvme_to_user_ptr(ubuffer),
+ bufflen, GFP_KERNEL, vec, 0, 0,
+ rq_data_dir(req));
+ }
if (ret)
goto out;
--
2.25.1
