linux-kernel - Re: [PATCH 04/33] vfs: Export rw_verify

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Message-ID: <20210216102614.GA27555@lst.de>
Date:   Tue, 16 Feb 2021 11:26:14 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Howells <dhowells@...hat.com>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>,
        Matthew Wilcox <willy@...radead.org>, linux-mm@...ck.org,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, Jeff Layton <jlayton@...hat.com>,
        David Wysochanski <dwysocha@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/33] vfs: Export rw_verify_area() for use by
 cachefiles

On Mon, Feb 15, 2021 at 03:45:01PM +0000, David Howells wrote:
> Export rw_verify_area() for so that cachefiles can use it before issuing
> call_read_iter() and call_write_iter() to effect async DIO operations
> against the cache.  This is analogous to aio_read() and aio_write().

I don't think this is the right thing to do.  Instead of calling
into ->read_iter / ->write_iter directly this should be using helpers.

What prevents you from using vfs_iocb_iter_read and
vfs_iocb_iter_write which seem the right level of abstraction for this?