linux-kernel - [PATCH 1/5] virtio_blk: cleanup zoned device probing

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Message-Id: <20231217165359.604246-2-hch@lst.de>
Date: Sun, 17 Dec 2023 17:53:55 +0100
From: Christoph Hellwig <hch@....de>
To: Jens Axboe <axboe@...nel.dk>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Stefan Hajnoczi <stefanha@...hat.com>,
	Damien Le Moal <dlemoal@...nel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	dm-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux.dev,
	linux-nvme@...ts.infradead.org,
	linux-scsi@...r.kernel.org,
	linux-btrfs@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH 1/5] virtio_blk: cleanup zoned device probing

Move reading and checking the zoned model from virtblk_probe_zoned_device
into the caller, leaving only the code to perform the actual setup for
host managed zoned devices in virtblk_probe_zoned_device.

This allows to share the model reading and sharing between builds with
and without CONFIG_BLK_DEV_ZONED, and improve it for the
!CONFIG_BLK_DEV_ZONED case.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/block/virtio_blk.c | 50 +++++++++++++++++---------------------
 1 file changed, 22 insertions(+), 28 deletions(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index d53d6aa8ee69a4..aeead732a24dc9 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -748,22 +748,6 @@ static int virtblk_probe_zoned_device(struct virtio_device *vdev,
 				       struct request_queue *q)
 {
 	u32 v, wg;
-	u8 model;
-
-	virtio_cread(vdev, struct virtio_blk_config,
-		     zoned.model, &model);
-
-	switch (model) {
-	case VIRTIO_BLK_Z_NONE:
-	case VIRTIO_BLK_Z_HA:
-		/* Present the host-aware device as non-zoned */
-		return 0;
-	case VIRTIO_BLK_Z_HM:
-		break;
-	default:
-		dev_err(&vdev->dev, "unsupported zone model %d\n", model);
-		return -EINVAL;
-	}
 
 	dev_dbg(&vdev->dev, "probing host-managed zoned device\n");
 
@@ -846,16 +830,9 @@ static inline void virtblk_revalidate_zones(struct virtio_blk *vblk)
 static inline int virtblk_probe_zoned_device(struct virtio_device *vdev,
 			struct virtio_blk *vblk, struct request_queue *q)
 {
-	u8 model;
-
-	virtio_cread(vdev, struct virtio_blk_config, zoned.model, &model);
-	if (model == VIRTIO_BLK_Z_HM) {
-		dev_err(&vdev->dev,
-			"virtio_blk: zoned devices are not supported");
-		return -EOPNOTSUPP;
-	}
-
-	return 0;
+	dev_err(&vdev->dev,
+		"virtio_blk: zoned devices are not supported");
+	return -EOPNOTSUPP;
 }
 #endif /* CONFIG_BLK_DEV_ZONED */
 
@@ -1570,9 +1547,26 @@ static int virtblk_probe(struct virtio_device *vdev)
 	 * placed after the virtio_device_ready() call above.
 	 */
 	if (virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED)) {
-		err = virtblk_probe_zoned_device(vdev, vblk, q);
-		if (err)
+		u8 model;
+
+		virtio_cread(vdev, struct virtio_blk_config, zoned.model,
+				&model);
+		switch (model) {
+		case VIRTIO_BLK_Z_NONE:
+		case VIRTIO_BLK_Z_HA:
+			/* Present the host-aware device as non-zoned */
+			break;
+		case VIRTIO_BLK_Z_HM:
+			err = virtblk_probe_zoned_device(vdev, vblk, q);
+			if (err)
+				goto out_cleanup_disk;
+			break;
+		default:
+			dev_err(&vdev->dev, "unsupported zone model %d\n",
+				model);
+			err = -EINVAL;
 			goto out_cleanup_disk;
+		}
 	}
 
 	err = device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups);
-- 
2.39.2