linux-kernel - Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction

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Message-ID: <yq1ilh9ucg3.fsf@ca-mkp.ca.oracle.com>
Date:   Fri, 13 Jan 2023 20:34:50 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Bart Van Assche <bart.vanassche@...il.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Douglas Gilbert <dgilbert@...erlog.com>
Subject: Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available
 rather than iterator direction


Bart,

> I'm not sure that we still need the double copy in the sg driver. It
> seems obscure to me that there is user space software that relies on
> finding "0xec" in bytes not originating from a SCSI
> device. Additionally, SCSI drivers that do not support residuals
> should be something from the past.

Yeah. I'm not aware of anything that relies on this still. But obviously
Doug has more experience in the app dependency department.

-- 
Martin K. Petersen	Oracle Linux Engineering