Re: [PATCH -next RFC 02/14] xen/blkback: use bdev api in xen_update_blkif_status()

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在 2023/12/06 13:55, Christoph Hellwig 写道:
On Tue, Dec 05, 2023 at 08:37:16PM +0800, Yu Kuai wrote:
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index e34219ea2b05..e645afa4af57 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -104,8 +104,7 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
  		xenbus_dev_error(blkif->be->dev, err, "block flush");
-	invalidate_inode_pages2(
-			blkif->vbd.bdev_handle->bdev->bd_inode->i_mapping);
+	invalidate_bdev(blkif->vbd.bdev_handle->bdev);

blkbak is a bdev exported.   I don't think it should ever call
invalidate_inode_pages2, through a wrapper or not.

I'm not sure about this. I'm not familiar with xen/blkback, but I saw
that xen-blkback will open a bdev from xen_vbd_create(), hence this
looks like a dm/md for me, hence it sounds reasonable to sync +
invalidate the opened bdev while initialization. Please kindly correct
me if I'm wrong.



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