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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.