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

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To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
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 20:33:13 -0500
Cc: Bart Van Assche <bart.vanassche@xxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, 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: <Y8Ds9JbWNGlWnoj9@infradead.org> (Christoph Hellwig's message of "Thu, 12 Jan 2023 21:32:36 -0800")
Organization: Oracle Corporation

Christoph,

> Yeah.  And that weird (ab)use of blk_rq_map_user_iov into preallocated
> pages in sg has been a constant source of pain.  I'd be very happy to
> make it match the generic SG_IO implementation and either do
> get_user_pages or the normal bounce buffering implemented in the
> common code.

Yes, it would be nice to get that cleaned up.

-- 
Martin K. Petersen	Oracle Linux Engineering

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

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