block: provide a request helper for user integrity segments

Provide a helper to keep the request flags and nr_integrity_segments in
sync with the bio's integrity payload. This is an integrity equivalent
to the normal data helper function, 'blk_rq_map_user()'.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20240913182854.2445457-6-kbusch@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/nvme/host/ioctl.c

@@ -3,7 +3,6 @@
  * Copyright (c) 2011-2014, Intel Corporation.
  * Copyright (c) 2017-2021 Christoph Hellwig.
  */
-#include <linux/bio-integrity.h>
 #include <linux/blk-integrity.h>
 #include <linux/ptrace.h>	/* for force_successful_syscall_return */
 #include <linux/nvme_ioctl.h>
@@ -153,11 +152,10 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
 		bio_set_dev(bio, bdev);
 
 	if (has_metadata) {
-		ret = bio_integrity_map_user(bio, meta_buffer, meta_len,
-					     meta_seed);
+		ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len,
+						meta_seed);
 		if (ret)
 			goto out_unmap;
-		req->cmd_flags |= REQ_INTEGRITY;
 	}
 
 	return ret;