linux-kernel - [PATCH 1/1] virtio: disable partitions scanning for no partitions block

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Date:   Thu, 20 May 2021 16:39:08 +0300
From:   Yury Kamenev <damtev@...dex-team.ru>
To:     mst@...hat.com, jasowang@...hat.com, pbonzini@...hat.com,
        stefanha@...hat.com, axboe@...nel.dk,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yury Kamenev <damtev@...dex-team.ru>
Subject: [PATCH 1/1] virtio: disable partitions scanning for no partitions block

Signed-off-by: Yury Kamenev <damtev@...dex-team.ru>
---
 drivers/block/virtio_blk.c      | 6 ++++++
 include/uapi/linux/virtio_blk.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b9fa3ef5b57c..17edcfee2208 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -799,6 +799,10 @@ static int virtblk_probe(struct virtio_device *vdev)
 	vblk->disk->flags |= GENHD_FL_EXT_DEVT;
 	vblk->index = index;
 
+	/*Disable partitions scanning for no-partitions block*/
+	if (virtio_has_feature(vdev, VIRTIO_BLK_F_NO_PS))
+		vblk->disk->flags |= GENHD_FL_NO_PART_SCAN;
+
 	/* configure queue flush support */
 	virtblk_update_cache_mode(vdev);
 
@@ -977,6 +981,7 @@ static unsigned int features_legacy[] = {
 	VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
 	VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
 	VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
+	VIRTIO_BLK_F_NO_PS,
 }
 ;
 static unsigned int features[] = {
@@ -984,6 +989,7 @@ static unsigned int features[] = {
 	VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
 	VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
 	VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
+	VIRTIO_BLK_F_NO_PS,
 };
 
 static struct virtio_driver virtio_blk = {
diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h
index d888f013d9ff..f197d07afb05 100644
--- a/include/uapi/linux/virtio_blk.h
+++ b/include/uapi/linux/virtio_blk.h
@@ -40,6 +40,7 @@
 #define VIRTIO_BLK_F_MQ		12	/* support more than one vq */
 #define VIRTIO_BLK_F_DISCARD	13	/* DISCARD is supported */
 #define VIRTIO_BLK_F_WRITE_ZEROES	14	/* WRITE ZEROES is supported */
+#define VIRTIO_BLK_F_NO_PS      16      /* No partitions */
 
 /* Legacy feature bits */
 #ifndef VIRTIO_BLK_NO_LEGACY
-- 
2.24.3 (Apple Git-128)