linux-ext4 - Re: [PATCH RFC v3 for-6.8/block 02/17] xen/blkback: use bdev api in xen_update_blkif

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Date: Thu, 4 Jan 2024 12:06:31 +0100
From: Jan Kara <jack@...e.cz>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: axboe@...nel.dk, roger.pau@...rix.com, colyli@...e.de,
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Subject: Re: [PATCH RFC v3 for-6.8/block 02/17] xen/blkback: use bdev api in
 xen_update_blkif_status()

On Thu 21-12-23 16:56:57, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@...wei.com>
> 
> Avoid to access bd_inode directly, prepare to remove bd_inode from
> block_devcie.
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  drivers/block/xen-blkback/xenbus.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> 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");
>  		return;
>  	}
> -	invalidate_inode_pages2(
> -			blkif->vbd.bdev_handle->bdev->bd_inode->i_mapping);
> +	invalidate_bdev(blkif->vbd.bdev_handle->bdev);

This function uses invalidate_inode_pages2() while invalidate_bdev() ends
up using mapping_try_invalidate() and there are subtle behavioral
differences between these two (for example invalidate_inode_pages2() tries
to clean dirty pages using the ->launder_folio method). So I think you'll
need helper like invalidate_bdev2() for this.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR