linux-kernel - Re: [PATCH 0/7] IB/hfi1: Remove write() and use ioctl() for user access

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Date:	Mon, 18 Apr 2016 08:00:27 -0400
From:	Dennis Dalessandro <dennis.dalessandro@...el.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Leon Romanovsky <leon@...n.nu>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ira Weiny <ira.weiny@...el.com>, dledford@...hat.com,
	linux-rdma@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] IB/hfi1: Remove write() and use ioctl() for user access

On Sat, Apr 16, 2016 at 08:19:17PM +0100, Al Viro wrote:

>While we are at it, could the person who'd come up with ui_lseek() be located
>and made to stand up and explain the rationale behind the SEEK_END semantics
>therein?  To quote the manpage (and paraphrase just about any introductory
>textbook):
>       SEEK_END
>              The file offset is set to the size of the file plus offset bytes.
>
>I'm really curious - which part of "plus" might have lead to
>        case SEEK_END:
>                offset = ((dd->kregend - dd->kregbase) + DC8051_DATA_MEM_SIZE) -
>                        offset;
>and, if its author has decided that of course it _must_ have meant "minus",
>why had he or she failed to post a correction to the manpage?  Or, on the

Original author of that code confirmed it is just a coding mistake and we 
will fix it.

-Denny