From: Keith Busch <kbusch@kernel.org>
Date: Wed, 3 Sep 2025 20:27:46 +0000 (-0700)
Subject: blk-map: provide the bdev to bio if one exists
X-Git-Tag: v6.18-rc1~136^2~63
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d0d1d522316e91f2b935a78bbf962b8e529d8c4f;p=thirdparty%2Fkernel%2Fstable.git

blk-map: provide the bdev to bio if one exists

We can now safely provide a block device when extracting user pages for
driver and user passthrough commands. Set the bdev so the caller doesn't
have to do that later. This has an additional  benefit of being able to
extract P2P pages in the passthrough path.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/blk-map.c b/block/blk-map.c
index ca4f5cf000388..165f2234f00f4 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -253,10 +253,11 @@ static void blk_mq_map_bio_put(struct bio *bio)
 static struct bio *blk_rq_map_bio_alloc(struct request *rq,
 		unsigned int nr_vecs, gfp_t gfp_mask)
 {
+	struct block_device *bdev = rq->q->disk ? rq->q->disk->part0 : NULL;
 	struct bio *bio;
 
 	if (rq->cmd_flags & REQ_ALLOC_CACHE && (nr_vecs <= BIO_INLINE_VECS)) {
-		bio = bio_alloc_bioset(NULL, nr_vecs, rq->cmd_flags, gfp_mask,
+		bio = bio_alloc_bioset(bdev, nr_vecs, rq->cmd_flags, gfp_mask,
 					&fs_bio_set);
 		if (!bio)
 			return NULL;
@@ -264,7 +265,7 @@ static struct bio *blk_rq_map_bio_alloc(struct request *rq,
 		bio = bio_kmalloc(nr_vecs, gfp_mask);
 		if (!bio)
 			return NULL;
-		bio_init_inline(bio, NULL, nr_vecs, req_op(rq));
+		bio_init_inline(bio, bdev, nr_vecs, req_op(rq));
 	}
 	return bio;
 }
diff --git a/drivers/nvme/host/ioctl.c b/drivers/nvme/host/ioctl.c
index 6b3ac8ae3f34b..f778f3b5214bd 100644
--- a/drivers/nvme/host/ioctl.c
+++ b/drivers/nvme/host/ioctl.c
@@ -142,14 +142,9 @@ static int nvme_map_user_request(struct request *req, u64 ubuffer,
 		ret = blk_rq_map_user_io(req, NULL, nvme_to_user_ptr(ubuffer),
 				bufflen, GFP_KERNEL, flags & NVME_IOCTL_VEC, 0,
 				0, rq_data_dir(req));
-
 	if (ret)
 		return ret;
 
-	bio = req->bio;
-	if (bdev)
-		bio_set_dev(bio, bdev);
-
 	if (has_metadata) {
 		ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len);
 		if (ret)