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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Message-ID: <ZZec6mX1vz4ayRq1@infradead.org>
Date: Thu, 4 Jan 2024 22:08:42 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Jan Kara <jack@...e.cz>
Cc: Yu Kuai <yukuai1@...weicloud.com>, axboe@...nel.dk,
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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, Jan 04, 2024 at 12:06:31PM +0100, Jan Kara wrote:
> 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.

That assues that the existing code actually does this intentionally,
which seems doubtful.  But the change in behavior does not to be
documented and explained.