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

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To: Bart Van Assche <bart.vanassche@xxxxxxxxx>
Subject: Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Fri, 13 Jan 2023 20:34:50 -0500
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, Logan Gunthorpe <logang@xxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
In-reply-to: <c6f4014e-d199-d5e8-515c-5ffcd9946c80@gmail.com> (Bart Van Assche's message of "Thu, 12 Jan 2023 13:49:14 -0800")
Organization: Oracle Corporation

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

Follow-Ups:
- Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: Al Viro

References:
- Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: Christoph Hellwig
- [PATCH v5 0/9] iov_iter: Add extraction helpers
  - From: David Howells
- [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: David Howells
- Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: David Howells
- Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: Christoph Hellwig
- Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: Al Viro
- Re: [PATCH v5 3/9] iov_iter: Use IOCB/IOMAP_WRITE if available rather than iterator direction
  - From: Bart Van Assche

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