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Date: Fri, 26 Jun 2026 06:30:03 +0200
From: Christoph Hellwig <hch@lst.de>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>, Christian Brauner <brauner@kernel.org>,
	Kelu Ye <yekelu1@huawei.com>, Yifan Zhao <zhaoyifan28@huawei.com>,
	Ritesh Harjani <ritesh.list@gmail.com>,
	Joanne Koong <joannelkoong@gmail.com>,
	Namjae Jeon <linkinjeon@kernel.org>,
	Sungjong Seo <sj1557.seo@samsung.com>,
	Hyunchul Lee <hyc.lee@gmail.com>,
	Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
	Miklos Szeredi <miklos@szeredi.hu>, fuse-devel@lists.linux.dev,
	ntfs3@lists.linux.dev, linux-erofs@lists.ozlabs.org,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 1/2] iomap: consolidate bio submission
Message-ID: <20260626043003.GA8078@lst.de>
References: <20260625120803.2462291-1-hch@lst.de> <20260625120803.2462291-2-hch@lst.de> <20260625172740.GD6078@frogsfrogsfrogs>
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On Thu, Jun 25, 2026 at 10:27:40AM -0700, Darrick J. Wong wrote:
> >  
> > +	bio->bi_end_io = end_io;
> >  	if (iter->iomap.flags & IOMAP_F_INTEGRITY)
> >  		fs_bio_integrity_alloc(bio);
> 
> Ah, so the bug here is that all the pagecache readers should have been
> allocating integrity information for the bio before submitting it?

Well, all the ones that set IOMAP_F_INTEGRITY, which really is just
XFS at the momen.  And because if the iomap refactoring for fuse XFS
is now using it's own submit callback and does not get it..

> And
> because it doesn't, iomap_finish_ioend won't do the read verification?

Yeah.

> So the block layer does it for us, and that's why we don't use the ioend
> chaining?  And (I guess) the future userspace interface won't have any
> means to get at the integrity data?

Yeah.