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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, roger.pau@...rix.com, colyli@...e.de, kent.overstreet@...il.com, joern@...ybastard.org, miquel.raynal@...tlin.com, richard@....at, vigneshr@...com, sth@...ux.ibm.com, hoeppner@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com, jejb@...ux.ibm.com, martin.petersen@...cle.com, clm@...com, josef@...icpanda.com, dsterba@...e.com, viro@...iv.linux.org.uk, brauner@...nel.org, nico@...xnic.net, xiang@...nel.org, chao@...nel.org, tytso@....edu, adilger.kernel@...ger.ca, jack@...e.com, konishi.ryusuke@...il.com, willy@...radead.org, akpm@...ux-foundation.org, hare@...e.de, p.raghav@...sung.com, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org, linux-bcache@...r.kernel.org, linux-mtd@...ts.infradead.org, linux-s390@...r.kernel.org, linux-scsi@...r.kernel.org, linux-bcachefs@...r.kernel.org, linux-btrfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org, linux-nilfs@...r.kernel.org, yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com 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.
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